1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/* SCTP kernel implementation
3	* (C) Copyright IBM Corp. 2001, 2004
4	* Copyright (c) 1999-2000 Cisco, Inc.
5	* Copyright (c) 1999-2001 Motorola, Inc.
6	* Copyright (c) 2001-2003 Intel Corp.
7	* Copyright (c) 2001-2002 Nokia, Inc.
8	* Copyright (c) 2001 La Monte H.P. Yarroll
9	*
10	* This file is part of the SCTP kernel implementation
11	*
12	* These functions interface with the sockets layer to implement the
13	* SCTP Extensions for the Sockets API.
14	*
15	* Note that the descriptions from the specification are USER level
16	* functions--this file is the functions which populate the struct proto
17	* for SCTP which is the BOTTOM of the sockets interface.
18	*
19	* Please send any bug reports or fixes you make to the
20	* email address(es):
21	* lksctp developers <linux-sctp@vger.kernel.org>
22	*
23	* Written or modified by:
24	* La Monte H.P. Yarroll <piggy@acm.org>
25	* Narasimha Budihal <narsi@refcode.org>
26	* Karl Knutson <karl@athena.chicago.il.us>
27	* Jon Grimm <jgrimm@us.ibm.com>
28	* Xingang Guo <xingang.guo@intel.com>
29	* Daisy Chang <daisyc@us.ibm.com>
30	* Sridhar Samudrala <samudrala@us.ibm.com>
31	* Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32	* Ardelle Fan <ardelle.fan@intel.com>
33	* Ryan Layer <rmlayer@us.ibm.com>
34	* Anup Pemmaiah <pemmaiah@cc.usu.edu>
35	* Kevin Gao <kevin.gao@intel.com>
36	*/
37
38	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40	#include <crypto/hash.h>
41	#include <linux/types.h>
42	#include <linux/kernel.h>
43	#include <linux/wait.h>
44	#include <linux/time.h>
45	#include <linux/sched/signal.h>
46	#include <linux/ip.h>
47	#include <linux/capability.h>
48	#include <linux/fcntl.h>
49	#include <linux/poll.h>
50	#include <linux/init.h>
51	#include <linux/slab.h>
52	#include <linux/file.h>
53	#include <linux/compat.h>
54	#include <linux/rhashtable.h>
55
56	#include <net/ip.h>
57	#include <net/icmp.h>
58	#include <net/route.h>
59	#include <net/ipv6.h>
60	#include <net/inet_common.h>
61	#include <net/busy_poll.h>
62	#include <trace/events/sock.h>
63
64	#include <linux/socket.h> /* for sa_family_t */
65	#include <linux/export.h>
66	#include <net/sock.h>
67	#include <net/sctp/sctp.h>
68	#include <net/sctp/sm.h>
69	#include <net/sctp/stream_sched.h>
70	#include <net/rps.h>
71
72	/* Forward declarations for internal helper functions. */
73	static bool sctp_writeable(const struct sock *sk);
74	static void sctp_wfree(struct sk_buff *skb);
75	static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
76	size_t msg_len);
77	static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
78	static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
79	static int sctp_wait_for_accept(struct sock *sk, long timeo);
80	static void sctp_wait_for_close(struct sock *sk, long timeo);
81	static void sctp_destruct_sock(struct sock *sk);
82	static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
83	union sctp_addr *addr, int len);
84	static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
85	static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
86	static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
87	static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
88	static int sctp_send_asconf(struct sctp_association *asoc,
89	struct sctp_chunk *chunk);
90	static int sctp_do_bind(struct sock *, union sctp_addr *, int);
91	static int sctp_autobind(struct sock *sk);
92	static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
93	struct sctp_association *assoc,
94	enum sctp_socket_type type);
95
96	static unsigned long sctp_memory_pressure;
97	static atomic_long_t sctp_memory_allocated;
98	static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
99	struct percpu_counter sctp_sockets_allocated;
100
101	static void sctp_enter_memory_pressure(struct sock *sk)
102	{
103	WRITE_ONCE(sctp_memory_pressure, 1);
104	}
105
106
107	/* Get the sndbuf space available at the time on the association. */
108	static inline int sctp_wspace(struct sctp_association *asoc)
109	{
110	struct sock *sk = asoc->base.sk;
111
112	return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
113	: sk_stream_wspace(sk);
114	}
115
116	/* Increment the used sndbuf space count of the corresponding association by
117	* the size of the outgoing data chunk.
118	* Also, set the skb destructor for sndbuf accounting later.
119	*
120	* Since it is always 1-1 between chunk and skb, and also a new skb is always
121	* allocated for chunk bundling in sctp_packet_transmit(), we can use the
122	* destructor in the data chunk skb for the purpose of the sndbuf space
123	* tracking.
124	*/
125	static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
126	{
127	struct sctp_association *asoc = chunk->asoc;
128	struct sock *sk = asoc->base.sk;
129
130	/* The sndbuf space is tracked per association. */
131	sctp_association_hold(asoc);
132
133	if (chunk->shkey)
134	sctp_auth_shkey_hold(sh_key: chunk->shkey);
135
136	skb_set_owner_w(skb: chunk->skb, sk);
137
138	chunk->skb->destructor = sctp_wfree;
139	/* Save the chunk pointer in skb for sctp_wfree to use later. */
140	skb_shinfo(chunk->skb)->destructor_arg = chunk;
141
142	refcount_add(i: sizeof(struct sctp_chunk), r: &sk->sk_wmem_alloc);
143	asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
144	sk_wmem_queued_add(sk, val: chunk->skb->truesize + sizeof(struct sctp_chunk));
145	sk_mem_charge(sk, size: chunk->skb->truesize);
146	}
147
148	static void sctp_clear_owner_w(struct sctp_chunk *chunk)
149	{
150	skb_orphan(skb: chunk->skb);
151	}
152
153	#define traverse_and_process() \
154	do { \
155	msg = chunk->msg; \
156	if (msg == prev_msg) \
157	continue; \
158	list_for_each_entry(c, &msg->chunks, frag_list) { \
159	if ((clear && asoc->base.sk == c->skb->sk) || \
160	(!clear && asoc->base.sk != c->skb->sk)) \
161	cb(c); \
162	} \
163	prev_msg = msg; \
164	} while (0)
165
166	static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
167	bool clear,
168	void (*cb)(struct sctp_chunk *))
169
170	{
171	struct sctp_datamsg *msg, *prev_msg = NULL;
172	struct sctp_outq *q = &asoc->outqueue;
173	struct sctp_chunk *chunk, *c;
174	struct sctp_transport *t;
175
176	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
177	list_for_each_entry(chunk, &t->transmitted, transmitted_list)
178	traverse_and_process();
179
180	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
181	traverse_and_process();
182
183	list_for_each_entry(chunk, &q->sacked, transmitted_list)
184	traverse_and_process();
185
186	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
187	traverse_and_process();
188
189	list_for_each_entry(chunk, &q->out_chunk_list, list)
190	traverse_and_process();
191	}
192
193	static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
194	void (*cb)(struct sk_buff *, struct sock *))
195
196	{
197	struct sk_buff *skb, *tmp;
198
199	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
200	cb(skb, sk);
201
202	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
203	cb(skb, sk);
204
205	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206	cb(skb, sk);
207	}
208
209	/* Verify that this is a valid address. */
210	static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
211	int len)
212	{
213	struct sctp_af *af;
214
215	/* Verify basic sockaddr. */
216	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217	if (!af)
218	return -EINVAL;
219
220	/* Is this a valid SCTP address? */
221	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
222	return -EINVAL;
223
224	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
225	return -EINVAL;
226
227	return 0;
228	}
229
230	/* Look up the association by its id. If this is not a UDP-style
231	* socket, the ID field is always ignored.
232	*/
233	struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
234	{
235	struct sctp_association *asoc = NULL;
236
237	/* If this is not a UDP-style socket, assoc id should be ignored. */
238	if (!sctp_style(sk, UDP)) {
239	/* Return NULL if the socket state is not ESTABLISHED. It
240	* could be a TCP-style listening socket or a socket which
241	* hasn't yet called connect() to establish an association.
242	*/
243	if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
244	return NULL;
245
246	/* Get the first and the only association from the list. */
247	if (!list_empty(head: &sctp_sk(sk)->ep->asocs))
248	asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
249	struct sctp_association, asocs);
250	return asoc;
251	}
252
253	/* Otherwise this is a UDP-style socket. */
254	if (id <= SCTP_ALL_ASSOC)
255	return NULL;
256
257	spin_lock_bh(lock: &sctp_assocs_id_lock);
258	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, id: (int)id);
259	if (asoc && (asoc->base.sk != sk || asoc->base.dead))
260	asoc = NULL;
261	spin_unlock_bh(lock: &sctp_assocs_id_lock);
262
263	return asoc;
264	}
265
266	/* Look up the transport from an address and an assoc id. If both address and
267	* id are specified, the associations matching the address and the id should be
268	* the same.
269	*/
270	static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
271	struct sockaddr_storage *addr,
272	sctp_assoc_t id)
273	{
274	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
275	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
276	union sctp_addr *laddr = (union sctp_addr *)addr;
277	struct sctp_transport *transport;
278
279	if (!af || sctp_verify_addr(sk, addr: laddr, len: af->sockaddr_len))
280	return NULL;
281
282	addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
283	paddr: laddr,
284	&transport);
285
286	if (!addr_asoc)
287	return NULL;
288
289	id_asoc = sctp_id2assoc(sk, id);
290	if (id_asoc && (id_asoc != addr_asoc))
291	return NULL;
292
293	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sctp_sk(sk),
294	(union sctp_addr *)addr);
295
296	return transport;
297	}
298
299	/* API 3.1.2 bind() - UDP Style Syntax
300	* The syntax of bind() is,
301	*
302	* ret = bind(int sd, struct sockaddr *addr, int addrlen);
303	*
304	* sd - the socket descriptor returned by socket().
305	* addr - the address structure (struct sockaddr_in or struct
306	* sockaddr_in6 [RFC 2553]),
307	* addr_len - the size of the address structure.
308	*/
309	static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310	{
311	int retval = 0;
312
313	lock_sock(sk);
314
315	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
316	addr, addr_len);
317
318	/* Disallow binding twice. */
319	if (!sctp_sk(sk)->ep->base.bind_addr.port)
320	retval = sctp_do_bind(sk, (union sctp_addr *)addr,
321	addr_len);
322	else
323	retval = -EINVAL;
324
325	release_sock(sk);
326
327	return retval;
328	}
329
330	static int sctp_get_port_local(struct sock *, union sctp_addr *);
331
332	/* Verify this is a valid sockaddr. */
333	static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
334	union sctp_addr *addr, int len)
335	{
336	struct sctp_af *af;
337
338	/* Check minimum size. */
339	if (len < sizeof (struct sockaddr))
340	return NULL;
341
342	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
343	return NULL;
344
345	if (addr->sa.sa_family == AF_INET6) {
346	if (len < SIN6_LEN_RFC2133)
347	return NULL;
348	/* V4 mapped address are really of AF_INET family */
349	if (ipv6_addr_v4mapped(a: &addr->v6.sin6_addr) &&
350	!opt->pf->af_supported(AF_INET, opt))
351	return NULL;
352	}
353
354	/* If we get this far, af is valid. */
355	af = sctp_get_af_specific(addr->sa.sa_family);
356
357	if (len < af->sockaddr_len)
358	return NULL;
359
360	return af;
361	}
362
363	static void sctp_auto_asconf_init(struct sctp_sock *sp)
364	{
365	struct net *net = sock_net(sk: &sp->inet.sk);
366
367	if (net->sctp.default_auto_asconf) {
368	spin_lock_bh(lock: &net->sctp.addr_wq_lock);
369	list_add_tail(new: &sp->auto_asconf_list, head: &net->sctp.auto_asconf_splist);
370	spin_unlock_bh(lock: &net->sctp.addr_wq_lock);
371	sp->do_auto_asconf = 1;
372	}
373	}
374
375	/* Bind a local address either to an endpoint or to an association. */
376	static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
377	{
378	struct net *net = sock_net(sk);
379	struct sctp_sock *sp = sctp_sk(sk);
380	struct sctp_endpoint *ep = sp->ep;
381	struct sctp_bind_addr *bp = &ep->base.bind_addr;
382	struct sctp_af *af;
383	unsigned short snum;
384	int ret = 0;
385
386	/* Common sockaddr verification. */
387	af = sctp_sockaddr_af(opt: sp, addr, len);
388	if (!af) {
389	pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
390	__func__, sk, addr, len);
391	return -EINVAL;
392	}
393
394	snum = ntohs(addr->v4.sin_port);
395
396	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
397	__func__, sk, &addr->sa, bp->port, snum, len);
398
399	/* PF specific bind() address verification. */
400	if (!sp->pf->bind_verify(sp, addr))
401	return -EADDRNOTAVAIL;
402
403	/* We must either be unbound, or bind to the same port.
404	* It's OK to allow 0 ports if we are already bound.
405	* We'll just inhert an already bound port in this case
406	*/
407	if (bp->port) {
408	if (!snum)
409	snum = bp->port;
410	else if (snum != bp->port) {
411	pr_debug("%s: new port %d doesn't match existing port "
412	"%d\n", __func__, snum, bp->port);
413	return -EINVAL;
414	}
415	}
416
417	if (snum && inet_port_requires_bind_service(net, port: snum) &&
418	!ns_capable(ns: net->user_ns, CAP_NET_BIND_SERVICE))
419	return -EACCES;
420
421	/* See if the address matches any of the addresses we may have
422	* already bound before checking against other endpoints.
423	*/
424	if (sctp_bind_addr_match(bp, addr, sp))
425	return -EINVAL;
426
427	/* Make sure we are allowed to bind here.
428	* The function sctp_get_port_local() does duplicate address
429	* detection.
430	*/
431	addr->v4.sin_port = htons(snum);
432	if (sctp_get_port_local(sk, addr))
433	return -EADDRINUSE;
434
435	/* Refresh ephemeral port. */
436	if (!bp->port) {
437	bp->port = inet_sk(sk)->inet_num;
438	sctp_auto_asconf_init(sp);
439	}
440
441	/* Add the address to the bind address list.
442	* Use GFP_ATOMIC since BHs will be disabled.
443	*/
444	ret = sctp_add_bind_addr(bp, addr, new_size: af->sockaddr_len,
445	addr_state: SCTP_ADDR_SRC, GFP_ATOMIC);
446
447	if (ret) {
448	sctp_put_port(sk);
449	return ret;
450	}
451	/* Copy back into socket for getsockname() use. */
452	inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
453	sp->pf->to_sk_saddr(addr, sk);
454
455	return ret;
456	}
457
458	/* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
459	*
460	* R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
461	* at any one time. If a sender, after sending an ASCONF chunk, decides
462	* it needs to transfer another ASCONF Chunk, it MUST wait until the
463	* ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
464	* subsequent ASCONF. Note this restriction binds each side, so at any
465	* time two ASCONF may be in-transit on any given association (one sent
466	* from each endpoint).
467	*/
468	static int sctp_send_asconf(struct sctp_association *asoc,
469	struct sctp_chunk *chunk)
470	{
471	int retval = 0;
472
473	/* If there is an outstanding ASCONF chunk, queue it for later
474	* transmission.
475	*/
476	if (asoc->addip_last_asconf) {
477	list_add_tail(new: &chunk->list, head: &asoc->addip_chunk_list);
478	goto out;
479	}
480
481	/* Hold the chunk until an ASCONF_ACK is received. */
482	sctp_chunk_hold(chunk);
483	retval = sctp_primitive_ASCONF(asoc->base.net, asoc, arg: chunk);
484	if (retval)
485	sctp_chunk_free(chunk);
486	else
487	asoc->addip_last_asconf = chunk;
488
489	out:
490	return retval;
491	}
492
493	/* Add a list of addresses as bind addresses to local endpoint or
494	* association.
495	*
496	* Basically run through each address specified in the addrs/addrcnt
497	* array/length pair, determine if it is IPv6 or IPv4 and call
498	* sctp_do_bind() on it.
499	*
500	* If any of them fails, then the operation will be reversed and the
501	* ones that were added will be removed.
502	*
503	* Only sctp_setsockopt_bindx() is supposed to call this function.
504	*/
505	static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
506	{
507	int cnt;
508	int retval = 0;
509	void *addr_buf;
510	struct sockaddr *sa_addr;
511	struct sctp_af *af;
512
513	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
514	addrs, addrcnt);
515
516	addr_buf = addrs;
517	for (cnt = 0; cnt < addrcnt; cnt++) {
518	/* The list may contain either IPv4 or IPv6 address;
519	* determine the address length for walking thru the list.
520	*/
521	sa_addr = addr_buf;
522	af = sctp_get_af_specific(sa_addr->sa_family);
523	if (!af) {
524	retval = -EINVAL;
525	goto err_bindx_add;
526	}
527
528	retval = sctp_do_bind(sk, addr: (union sctp_addr *)sa_addr,
529	len: af->sockaddr_len);
530
531	addr_buf += af->sockaddr_len;
532
533	err_bindx_add:
534	if (retval < 0) {
535	/* Failed. Cleanup the ones that have been added */
536	if (cnt > 0)
537	sctp_bindx_rem(sk, addrs, cnt);
538	return retval;
539	}
540	}
541
542	return retval;
543	}
544
545	/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
546	* associations that are part of the endpoint indicating that a list of local
547	* addresses are added to the endpoint.
548	*
549	* If any of the addresses is already in the bind address list of the
550	* association, we do not send the chunk for that association. But it will not
551	* affect other associations.
552	*
553	* Only sctp_setsockopt_bindx() is supposed to call this function.
554	*/
555	static int sctp_send_asconf_add_ip(struct sock *sk,
556	struct sockaddr *addrs,
557	int addrcnt)
558	{
559	struct sctp_sock *sp;
560	struct sctp_endpoint *ep;
561	struct sctp_association *asoc;
562	struct sctp_bind_addr *bp;
563	struct sctp_chunk *chunk;
564	struct sctp_sockaddr_entry *laddr;
565	union sctp_addr *addr;
566	union sctp_addr saveaddr;
567	void *addr_buf;
568	struct sctp_af *af;
569	struct list_head *p;
570	int i;
571	int retval = 0;
572
573	sp = sctp_sk(sk);
574	ep = sp->ep;
575
576	if (!ep->asconf_enable)
577	return retval;
578
579	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
580	__func__, sk, addrs, addrcnt);
581
582	list_for_each_entry(asoc, &ep->asocs, asocs) {
583	if (!asoc->peer.asconf_capable)
584	continue;
585
586	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
587	continue;
588
589	if (!sctp_state(asoc, ESTABLISHED))
590	continue;
591
592	/* Check if any address in the packed array of addresses is
593	* in the bind address list of the association. If so,
594	* do not send the asconf chunk to its peer, but continue with
595	* other associations.
596	*/
597	addr_buf = addrs;
598	for (i = 0; i < addrcnt; i++) {
599	addr = addr_buf;
600	af = sctp_get_af_specific(addr->v4.sin_family);
601	if (!af) {
602	retval = -EINVAL;
603	goto out;
604	}
605
606	if (sctp_assoc_lookup_laddr(asoc, laddr: addr))
607	break;
608
609	addr_buf += af->sockaddr_len;
610	}
611	if (i < addrcnt)
612	continue;
613
614	/* Use the first valid address in bind addr list of
615	* association as Address Parameter of ASCONF CHUNK.
616	*/
617	bp = &asoc->base.bind_addr;
618	p = bp->address_list.next;
619	laddr = list_entry(p, struct sctp_sockaddr_entry, list);
620	chunk = sctp_make_asconf_update_ip(asoc, laddr: &laddr->a, addrs,
621	addrcnt, flags: SCTP_PARAM_ADD_IP);
622	if (!chunk) {
623	retval = -ENOMEM;
624	goto out;
625	}
626
627	/* Add the new addresses to the bind address list with
628	* use_as_src set to 0.
629	*/
630	addr_buf = addrs;
631	for (i = 0; i < addrcnt; i++) {
632	addr = addr_buf;
633	af = sctp_get_af_specific(addr->v4.sin_family);
634	memcpy(&saveaddr, addr, af->sockaddr_len);
635	retval = sctp_add_bind_addr(bp, &saveaddr,
636	new_size: sizeof(saveaddr),
637	addr_state: SCTP_ADDR_NEW, GFP_ATOMIC);
638	addr_buf += af->sockaddr_len;
639	}
640	if (asoc->src_out_of_asoc_ok) {
641	struct sctp_transport *trans;
642
643	list_for_each_entry(trans,
644	&asoc->peer.transport_addr_list, transports) {
645	trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
646	2*asoc->pathmtu, 4380));
647	trans->ssthresh = asoc->peer.i.a_rwnd;
648	trans->rto = asoc->rto_initial;
649	sctp_max_rto(asoc, trans);
650	trans->rtt = trans->srtt = trans->rttvar = 0;
651	/* Clear the source and route cache */
652	sctp_transport_route(trans, NULL,
653	sctp_sk(asoc->base.sk));
654	}
655	}
656	retval = sctp_send_asconf(asoc, chunk);
657	}
658
659	out:
660	return retval;
661	}
662
663	/* Remove a list of addresses from bind addresses list. Do not remove the
664	* last address.
665	*
666	* Basically run through each address specified in the addrs/addrcnt
667	* array/length pair, determine if it is IPv6 or IPv4 and call
668	* sctp_del_bind() on it.
669	*
670	* If any of them fails, then the operation will be reversed and the
671	* ones that were removed will be added back.
672	*
673	* At least one address has to be left; if only one address is
674	* available, the operation will return -EBUSY.
675	*
676	* Only sctp_setsockopt_bindx() is supposed to call this function.
677	*/
678	static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
679	{
680	struct sctp_sock *sp = sctp_sk(sk);
681	struct sctp_endpoint *ep = sp->ep;
682	int cnt;
683	struct sctp_bind_addr *bp = &ep->base.bind_addr;
684	int retval = 0;
685	void *addr_buf;
686	union sctp_addr *sa_addr;
687	struct sctp_af *af;
688
689	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
690	__func__, sk, addrs, addrcnt);
691
692	addr_buf = addrs;
693	for (cnt = 0; cnt < addrcnt; cnt++) {
694	/* If the bind address list is empty or if there is only one
695	* bind address, there is nothing more to be removed (we need
696	* at least one address here).
697	*/
698	if (list_empty(head: &bp->address_list) ||
699	(sctp_list_single_entry(head: &bp->address_list))) {
700	retval = -EBUSY;
701	goto err_bindx_rem;
702	}
703
704	sa_addr = addr_buf;
705	af = sctp_get_af_specific(sa_addr->sa.sa_family);
706	if (!af) {
707	retval = -EINVAL;
708	goto err_bindx_rem;
709	}
710
711	if (!af->addr_valid(sa_addr, sp, NULL)) {
712	retval = -EADDRNOTAVAIL;
713	goto err_bindx_rem;
714	}
715
716	if (sa_addr->v4.sin_port &&
717	sa_addr->v4.sin_port != htons(bp->port)) {
718	retval = -EINVAL;
719	goto err_bindx_rem;
720	}
721
722	if (!sa_addr->v4.sin_port)
723	sa_addr->v4.sin_port = htons(bp->port);
724
725	/* FIXME - There is probably a need to check if sk->sk_saddr and
726	* sk->sk_rcv_addr are currently set to one of the addresses to
727	* be removed. This is something which needs to be looked into
728	* when we are fixing the outstanding issues with multi-homing
729	* socket routing and failover schemes. Refer to comments in
730	* sctp_do_bind(). -daisy
731	*/
732	retval = sctp_del_bind_addr(bp, sa_addr);
733
734	addr_buf += af->sockaddr_len;
735	err_bindx_rem:
736	if (retval < 0) {
737	/* Failed. Add the ones that has been removed back */
738	if (cnt > 0)
739	sctp_bindx_add(sk, addrs, addrcnt: cnt);
740	return retval;
741	}
742	}
743
744	return retval;
745	}
746
747	/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
748	* the associations that are part of the endpoint indicating that a list of
749	* local addresses are removed from the endpoint.
750	*
751	* If any of the addresses is already in the bind address list of the
752	* association, we do not send the chunk for that association. But it will not
753	* affect other associations.
754	*
755	* Only sctp_setsockopt_bindx() is supposed to call this function.
756	*/
757	static int sctp_send_asconf_del_ip(struct sock *sk,
758	struct sockaddr *addrs,
759	int addrcnt)
760	{
761	struct sctp_sock *sp;
762	struct sctp_endpoint *ep;
763	struct sctp_association *asoc;
764	struct sctp_transport *transport;
765	struct sctp_bind_addr *bp;
766	struct sctp_chunk *chunk;
767	union sctp_addr *laddr;
768	void *addr_buf;
769	struct sctp_af *af;
770	struct sctp_sockaddr_entry *saddr;
771	int i;
772	int retval = 0;
773	int stored = 0;
774
775	chunk = NULL;
776	sp = sctp_sk(sk);
777	ep = sp->ep;
778
779	if (!ep->asconf_enable)
780	return retval;
781
782	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
783	__func__, sk, addrs, addrcnt);
784
785	list_for_each_entry(asoc, &ep->asocs, asocs) {
786
787	if (!asoc->peer.asconf_capable)
788	continue;
789
790	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791	continue;
792
793	if (!sctp_state(asoc, ESTABLISHED))
794	continue;
795
796	/* Check if any address in the packed array of addresses is
797	* not present in the bind address list of the association.
798	* If so, do not send the asconf chunk to its peer, but
799	* continue with other associations.
800	*/
801	addr_buf = addrs;
802	for (i = 0; i < addrcnt; i++) {
803	laddr = addr_buf;
804	af = sctp_get_af_specific(laddr->v4.sin_family);
805	if (!af) {
806	retval = -EINVAL;
807	goto out;
808	}
809
810	if (!sctp_assoc_lookup_laddr(asoc, laddr))
811	break;
812
813	addr_buf += af->sockaddr_len;
814	}
815	if (i < addrcnt)
816	continue;
817
818	/* Find one address in the association's bind address list
819	* that is not in the packed array of addresses. This is to
820	* make sure that we do not delete all the addresses in the
821	* association.
822	*/
823	bp = &asoc->base.bind_addr;
824	laddr = sctp_find_unmatch_addr(bp, addrs: (union sctp_addr *)addrs,
825	addrcnt, opt: sp);
826	if ((laddr == NULL) && (addrcnt == 1)) {
827	if (asoc->asconf_addr_del_pending)
828	continue;
829	asoc->asconf_addr_del_pending =
830	kzalloc(size: sizeof(union sctp_addr), GFP_ATOMIC);
831	if (asoc->asconf_addr_del_pending == NULL) {
832	retval = -ENOMEM;
833	goto out;
834	}
835	asoc->asconf_addr_del_pending->sa.sa_family =
836	addrs->sa_family;
837	asoc->asconf_addr_del_pending->v4.sin_port =
838	htons(bp->port);
839	if (addrs->sa_family == AF_INET) {
840	struct sockaddr_in *sin;
841
842	sin = (struct sockaddr_in *)addrs;
843	asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
844	} else if (addrs->sa_family == AF_INET6) {
845	struct sockaddr_in6 *sin6;
846
847	sin6 = (struct sockaddr_in6 *)addrs;
848	asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849	}
850
851	pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
852	__func__, asoc, &asoc->asconf_addr_del_pending->sa,
853	asoc->asconf_addr_del_pending);
854
855	asoc->src_out_of_asoc_ok = 1;
856	stored = 1;
857	goto skip_mkasconf;
858	}
859
860	if (laddr == NULL)
861	return -EINVAL;
862
863	/* We do not need RCU protection throughout this loop
864	* because this is done under a socket lock from the
865	* setsockopt call.
866	*/
867	chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
868	flags: SCTP_PARAM_DEL_IP);
869	if (!chunk) {
870	retval = -ENOMEM;
871	goto out;
872	}
873
874	skip_mkasconf:
875	/* Reset use_as_src flag for the addresses in the bind address
876	* list that are to be deleted.
877	*/
878	addr_buf = addrs;
879	for (i = 0; i < addrcnt; i++) {
880	laddr = addr_buf;
881	af = sctp_get_af_specific(laddr->v4.sin_family);
882	list_for_each_entry(saddr, &bp->address_list, list) {
883	if (sctp_cmp_addr_exact(ss1: &saddr->a, ss2: laddr))
884	saddr->state = SCTP_ADDR_DEL;
885	}
886	addr_buf += af->sockaddr_len;
887	}
888
889	/* Update the route and saddr entries for all the transports
890	* as some of the addresses in the bind address list are
891	* about to be deleted and cannot be used as source addresses.
892	*/
893	list_for_each_entry(transport, &asoc->peer.transport_addr_list,
894	transports) {
895	sctp_transport_route(transport, NULL,
896	sctp_sk(asoc->base.sk));
897	}
898
899	if (stored)
900	/* We don't need to transmit ASCONF */
901	continue;
902	retval = sctp_send_asconf(asoc, chunk);
903	}
904	out:
905	return retval;
906	}
907
908	/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
909	int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
910	{
911	struct sock *sk = sctp_opt2sk(sp);
912	union sctp_addr *addr;
913	struct sctp_af *af;
914
915	/* It is safe to write port space in caller. */
916	addr = &addrw->a;
917	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
918	af = sctp_get_af_specific(addr->sa.sa_family);
919	if (!af)
920	return -EINVAL;
921	if (sctp_verify_addr(sk, addr, len: af->sockaddr_len))
922	return -EINVAL;
923
924	if (addrw->state == SCTP_ADDR_NEW)
925	return sctp_send_asconf_add_ip(sk, addrs: (struct sockaddr *)addr, addrcnt: 1);
926	else
927	return sctp_send_asconf_del_ip(sk, addrs: (struct sockaddr *)addr, addrcnt: 1);
928	}
929
930	/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
931	*
932	* API 8.1
933	* int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
934	* int flags);
935	*
936	* If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
937	* If the sd is an IPv6 socket, the addresses passed can either be IPv4
938	* or IPv6 addresses.
939	*
940	* A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
941	* Section 3.1.2 for this usage.
942	*
943	* addrs is a pointer to an array of one or more socket addresses. Each
944	* address is contained in its appropriate structure (i.e. struct
945	* sockaddr_in or struct sockaddr_in6) the family of the address type
946	* must be used to distinguish the address length (note that this
947	* representation is termed a "packed array" of addresses). The caller
948	* specifies the number of addresses in the array with addrcnt.
949	*
950	* On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
951	* -1, and sets errno to the appropriate error code.
952	*
953	* For SCTP, the port given in each socket address must be the same, or
954	* sctp_bindx() will fail, setting errno to EINVAL.
955	*
956	* The flags parameter is formed from the bitwise OR of zero or more of
957	* the following currently defined flags:
958	*
959	* SCTP_BINDX_ADD_ADDR
960	*
961	* SCTP_BINDX_REM_ADDR
962	*
963	* SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
964	* association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
965	* addresses from the association. The two flags are mutually exclusive;
966	* if both are given, sctp_bindx() will fail with EINVAL. A caller may
967	* not remove all addresses from an association; sctp_bindx() will
968	* reject such an attempt with EINVAL.
969	*
970	* An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
971	* additional addresses with an endpoint after calling bind(). Or use
972	* sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
973	* socket is associated with so that no new association accepted will be
974	* associated with those addresses. If the endpoint supports dynamic
975	* address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
976	* endpoint to send the appropriate message to the peer to change the
977	* peers address lists.
978	*
979	* Adding and removing addresses from a connected association is
980	* optional functionality. Implementations that do not support this
981	* functionality should return EOPNOTSUPP.
982	*
983	* Basically do nothing but copying the addresses from user to kernel
984	* land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
985	* This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
986	* from userspace.
987	*
988	* On exit there is no need to do sockfd_put(), sys_setsockopt() does
989	* it.
990	*
991	* sk The sk of the socket
992	* addrs The pointer to the addresses
993	* addrssize Size of the addrs buffer
994	* op Operation to perform (add or remove, see the flags of
995	* sctp_bindx)
996	*
997	* Returns 0 if ok, <0 errno code on error.
998	*/
999	static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
1000	int addrs_size, int op)
1001	{
1002	int err;
1003	int addrcnt = 0;
1004	int walk_size = 0;
1005	struct sockaddr *sa_addr;
1006	void *addr_buf = addrs;
1007	struct sctp_af *af;
1008
1009	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1010	__func__, sk, addr_buf, addrs_size, op);
1011
1012	if (unlikely(addrs_size <= 0))
1013	return -EINVAL;
1014
1015	/* Walk through the addrs buffer and count the number of addresses. */
1016	while (walk_size < addrs_size) {
1017	if (walk_size + sizeof(sa_family_t) > addrs_size)
1018	return -EINVAL;
1019
1020	sa_addr = addr_buf;
1021	af = sctp_get_af_specific(sa_addr->sa_family);
1022
1023	/* If the address family is not supported or if this address
1024	* causes the address buffer to overflow return EINVAL.
1025	*/
1026	if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1027	return -EINVAL;
1028	addrcnt++;
1029	addr_buf += af->sockaddr_len;
1030	walk_size += af->sockaddr_len;
1031	}
1032
1033	/* Do the work. */
1034	switch (op) {
1035	case SCTP_BINDX_ADD_ADDR:
1036	/* Allow security module to validate bindx addresses. */
1037	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1038	address: addrs, addrlen: addrs_size);
1039	if (err)
1040	return err;
1041	err = sctp_bindx_add(sk, addrs, addrcnt);
1042	if (err)
1043	return err;
1044	return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1045	case SCTP_BINDX_REM_ADDR:
1046	err = sctp_bindx_rem(sk, addrs, addrcnt);
1047	if (err)
1048	return err;
1049	return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1050
1051	default:
1052	return -EINVAL;
1053	}
1054	}
1055
1056	static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1057	int addrlen)
1058	{
1059	int err;
1060
1061	lock_sock(sk);
1062	err = sctp_setsockopt_bindx(sk, addrs, addrs_size: addrlen, SCTP_BINDX_ADD_ADDR);
1063	release_sock(sk);
1064	return err;
1065	}
1066
1067	static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1068	const union sctp_addr *daddr,
1069	const struct sctp_initmsg *init,
1070	struct sctp_transport **tp)
1071	{
1072	struct sctp_association *asoc;
1073	struct sock *sk = ep->base.sk;
1074	struct net *net = sock_net(sk);
1075	enum sctp_scope scope;
1076	int err;
1077
1078	if (sctp_endpoint_is_peeled_off(ep, paddr: daddr))
1079	return -EADDRNOTAVAIL;
1080
1081	if (!ep->base.bind_addr.port) {
1082	if (sctp_autobind(sk))
1083	return -EAGAIN;
1084	} else {
1085	if (inet_port_requires_bind_service(net, port: ep->base.bind_addr.port) &&
1086	!ns_capable(ns: net->user_ns, CAP_NET_BIND_SERVICE))
1087	return -EACCES;
1088	}
1089
1090	scope = sctp_scope(addr: daddr);
1091	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1092	if (!asoc)
1093	return -ENOMEM;
1094
1095	err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1096	if (err < 0)
1097	goto free;
1098
1099	*tp = sctp_assoc_add_peer(asoc, address: daddr, GFP_KERNEL, peer_state: SCTP_UNKNOWN);
1100	if (!*tp) {
1101	err = -ENOMEM;
1102	goto free;
1103	}
1104
1105	if (!init)
1106	return 0;
1107
1108	if (init->sinit_num_ostreams) {
1109	__u16 outcnt = init->sinit_num_ostreams;
1110
1111	asoc->c.sinit_num_ostreams = outcnt;
1112	/* outcnt has been changed, need to re-init stream */
1113	err = sctp_stream_init(stream: &asoc->stream, outcnt, incnt: 0, GFP_KERNEL);
1114	if (err)
1115	goto free;
1116	}
1117
1118	if (init->sinit_max_instreams)
1119	asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1120
1121	if (init->sinit_max_attempts)
1122	asoc->max_init_attempts = init->sinit_max_attempts;
1123
1124	if (init->sinit_max_init_timeo)
1125	asoc->max_init_timeo =
1126	msecs_to_jiffies(m: init->sinit_max_init_timeo);
1127
1128	return 0;
1129	free:
1130	sctp_association_free(asoc);
1131	return err;
1132	}
1133
1134	static int sctp_connect_add_peer(struct sctp_association *asoc,
1135	union sctp_addr *daddr, int addr_len)
1136	{
1137	struct sctp_endpoint *ep = asoc->ep;
1138	struct sctp_association *old;
1139	struct sctp_transport *t;
1140	int err;
1141
1142	err = sctp_verify_addr(sk: ep->base.sk, addr: daddr, len: addr_len);
1143	if (err)
1144	return err;
1145
1146	old = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &t);
1147	if (old && old != asoc)
1148	return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1149	: -EALREADY;
1150
1151	if (sctp_endpoint_is_peeled_off(ep, paddr: daddr))
1152	return -EADDRNOTAVAIL;
1153
1154	t = sctp_assoc_add_peer(asoc, address: daddr, GFP_KERNEL, peer_state: SCTP_UNKNOWN);
1155	if (!t)
1156	return -ENOMEM;
1157
1158	return 0;
1159	}
1160
1161	/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1162	*
1163	* Common routine for handling connect() and sctp_connectx().
1164	* Connect will come in with just a single address.
1165	*/
1166	static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1167	int addrs_size, int flags, sctp_assoc_t *assoc_id)
1168	{
1169	struct sctp_sock *sp = sctp_sk(sk);
1170	struct sctp_endpoint *ep = sp->ep;
1171	struct sctp_transport *transport;
1172	struct sctp_association *asoc;
1173	void *addr_buf = kaddrs;
1174	union sctp_addr *daddr;
1175	struct sctp_af *af;
1176	int walk_size, err;
1177	long timeo;
1178
1179	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1180	(sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1181	return -EISCONN;
1182
1183	daddr = addr_buf;
1184	af = sctp_get_af_specific(daddr->sa.sa_family);
1185	if (!af || af->sockaddr_len > addrs_size)
1186	return -EINVAL;
1187
1188	err = sctp_verify_addr(sk, addr: daddr, len: af->sockaddr_len);
1189	if (err)
1190	return err;
1191
1192	asoc = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &transport);
1193	if (asoc)
1194	return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1195	: -EALREADY;
1196
1197	err = sctp_connect_new_asoc(ep, daddr, NULL, tp: &transport);
1198	if (err)
1199	return err;
1200	asoc = transport->asoc;
1201
1202	addr_buf += af->sockaddr_len;
1203	walk_size = af->sockaddr_len;
1204	while (walk_size < addrs_size) {
1205	err = -EINVAL;
1206	if (walk_size + sizeof(sa_family_t) > addrs_size)
1207	goto out_free;
1208
1209	daddr = addr_buf;
1210	af = sctp_get_af_specific(daddr->sa.sa_family);
1211	if (!af || af->sockaddr_len + walk_size > addrs_size)
1212	goto out_free;
1213
1214	if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1215	goto out_free;
1216
1217	err = sctp_connect_add_peer(asoc, daddr, addr_len: af->sockaddr_len);
1218	if (err)
1219	goto out_free;
1220
1221	addr_buf += af->sockaddr_len;
1222	walk_size += af->sockaddr_len;
1223	}
1224
1225	/* In case the user of sctp_connectx() wants an association
1226	* id back, assign one now.
1227	*/
1228	if (assoc_id) {
1229	err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1230	if (err < 0)
1231	goto out_free;
1232	}
1233
1234	err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1235	if (err < 0)
1236	goto out_free;
1237
1238	/* Initialize sk's dport and daddr for getpeername() */
1239	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1240	sp->pf->to_sk_daddr(daddr, sk);
1241	sk->sk_err = 0;
1242
1243	if (assoc_id)
1244	*assoc_id = asoc->assoc_id;
1245
1246	timeo = sock_sndtimeo(sk, noblock: flags & O_NONBLOCK);
1247	return sctp_wait_for_connect(asoc, timeo_p: &timeo);
1248
1249	out_free:
1250	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251	__func__, asoc, kaddrs, err);
1252	sctp_association_free(asoc);
1253	return err;
1254	}
1255
1256	/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1257	*
1258	* API 8.9
1259	* int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1260	* sctp_assoc_t *asoc);
1261	*
1262	* If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1263	* If the sd is an IPv6 socket, the addresses passed can either be IPv4
1264	* or IPv6 addresses.
1265	*
1266	* A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1267	* Section 3.1.2 for this usage.
1268	*
1269	* addrs is a pointer to an array of one or more socket addresses. Each
1270	* address is contained in its appropriate structure (i.e. struct
1271	* sockaddr_in or struct sockaddr_in6) the family of the address type
1272	* must be used to distengish the address length (note that this
1273	* representation is termed a "packed array" of addresses). The caller
1274	* specifies the number of addresses in the array with addrcnt.
1275	*
1276	* On success, sctp_connectx() returns 0. It also sets the assoc_id to
1277	* the association id of the new association. On failure, sctp_connectx()
1278	* returns -1, and sets errno to the appropriate error code. The assoc_id
1279	* is not touched by the kernel.
1280	*
1281	* For SCTP, the port given in each socket address must be the same, or
1282	* sctp_connectx() will fail, setting errno to EINVAL.
1283	*
1284	* An application can use sctp_connectx to initiate an association with
1285	* an endpoint that is multi-homed. Much like sctp_bindx() this call
1286	* allows a caller to specify multiple addresses at which a peer can be
1287	* reached. The way the SCTP stack uses the list of addresses to set up
1288	* the association is implementation dependent. This function only
1289	* specifies that the stack will try to make use of all the addresses in
1290	* the list when needed.
1291	*
1292	* Note that the list of addresses passed in is only used for setting up
1293	* the association. It does not necessarily equal the set of addresses
1294	* the peer uses for the resulting association. If the caller wants to
1295	* find out the set of peer addresses, it must use sctp_getpaddrs() to
1296	* retrieve them after the association has been set up.
1297	*
1298	* Basically do nothing but copying the addresses from user to kernel
1299	* land and invoking either sctp_connectx(). This is used for tunneling
1300	* the sctp_connectx() request through sctp_setsockopt() from userspace.
1301	*
1302	* On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303	* it.
1304	*
1305	* sk The sk of the socket
1306	* addrs The pointer to the addresses
1307	* addrssize Size of the addrs buffer
1308	*
1309	* Returns >=0 if ok, <0 errno code on error.
1310	*/
1311	static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1312	int addrs_size, sctp_assoc_t *assoc_id)
1313	{
1314	int err = 0, flags = 0;
1315
1316	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1317	__func__, sk, kaddrs, addrs_size);
1318
1319	/* make sure the 1st addr's sa_family is accessible later */
1320	if (unlikely(addrs_size < sizeof(sa_family_t)))
1321	return -EINVAL;
1322
1323	/* Allow security module to validate connectx addresses. */
1324	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1325	address: (struct sockaddr *)kaddrs,
1326	addrlen: addrs_size);
1327	if (err)
1328	return err;
1329
1330	/* in-kernel sockets don't generally have a file allocated to them
1331	* if all they do is call sock_create_kern().
1332	*/
1333	if (sk->sk_socket->file)
1334	flags = sk->sk_socket->file->f_flags;
1335
1336	return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1337	}
1338
1339	/*
1340	* This is an older interface. It's kept for backward compatibility
1341	* to the option that doesn't provide association id.
1342	*/
1343	static int sctp_setsockopt_connectx_old(struct sock *sk,
1344	struct sockaddr *kaddrs,
1345	int addrs_size)
1346	{
1347	return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1348	}
1349
1350	/*
1351	* New interface for the API. The since the API is done with a socket
1352	* option, to make it simple we feed back the association id is as a return
1353	* indication to the call. Error is always negative and association id is
1354	* always positive.
1355	*/
1356	static int sctp_setsockopt_connectx(struct sock *sk,
1357	struct sockaddr *kaddrs,
1358	int addrs_size)
1359	{
1360	sctp_assoc_t assoc_id = 0;
1361	int err = 0;
1362
1363	err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, assoc_id: &assoc_id);
1364
1365	if (err)
1366	return err;
1367	else
1368	return assoc_id;
1369	}
1370
1371	/*
1372	* New (hopefully final) interface for the API.
1373	* We use the sctp_getaddrs_old structure so that use-space library
1374	* can avoid any unnecessary allocations. The only different part
1375	* is that we store the actual length of the address buffer into the
1376	* addrs_num structure member. That way we can re-use the existing
1377	* code.
1378	*/
1379	#ifdef CONFIG_COMPAT
1380	struct compat_sctp_getaddrs_old {
1381	sctp_assoc_t assoc_id;
1382	s32 addr_num;
1383	compat_uptr_t addrs; /* struct sockaddr * */
1384	};
1385	#endif
1386
1387	static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1388	char __user *optval,
1389	int __user *optlen)
1390	{
1391	struct sctp_getaddrs_old param;
1392	sctp_assoc_t assoc_id = 0;
1393	struct sockaddr *kaddrs;
1394	int err = 0;
1395
1396	#ifdef CONFIG_COMPAT
1397	if (in_compat_syscall()) {
1398	struct compat_sctp_getaddrs_old param32;
1399
1400	if (len < sizeof(param32))
1401	return -EINVAL;
1402	if (copy_from_user(to: &param32, from: optval, n: sizeof(param32)))
1403	return -EFAULT;
1404
1405	param.assoc_id = param32.assoc_id;
1406	param.addr_num = param32.addr_num;
1407	param.addrs = compat_ptr(uptr: param32.addrs);
1408	} else
1409	#endif
1410	{
1411	if (len < sizeof(param))
1412	return -EINVAL;
1413	if (copy_from_user(to: &param, from: optval, n: sizeof(param)))
1414	return -EFAULT;
1415	}
1416
1417	kaddrs = memdup_user(param.addrs, param.addr_num);
1418	if (IS_ERR(ptr: kaddrs))
1419	return PTR_ERR(ptr: kaddrs);
1420
1421	err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size: param.addr_num, assoc_id: &assoc_id);
1422	kfree(objp: kaddrs);
1423	if (err == 0 || err == -EINPROGRESS) {
1424	if (copy_to_user(to: optval, from: &assoc_id, n: sizeof(assoc_id)))
1425	return -EFAULT;
1426	if (put_user(sizeof(assoc_id), optlen))
1427	return -EFAULT;
1428	}
1429
1430	return err;
1431	}
1432
1433	/* API 3.1.4 close() - UDP Style Syntax
1434	* Applications use close() to perform graceful shutdown (as described in
1435	* Section 10.1 of [SCTP]) on ALL the associations currently represented
1436	* by a UDP-style socket.
1437	*
1438	* The syntax is
1439	*
1440	* ret = close(int sd);
1441	*
1442	* sd - the socket descriptor of the associations to be closed.
1443	*
1444	* To gracefully shutdown a specific association represented by the
1445	* UDP-style socket, an application should use the sendmsg() call,
1446	* passing no user data, but including the appropriate flag in the
1447	* ancillary data (see Section xxxx).
1448	*
1449	* If sd in the close() call is a branched-off socket representing only
1450	* one association, the shutdown is performed on that association only.
1451	*
1452	* 4.1.6 close() - TCP Style Syntax
1453	*
1454	* Applications use close() to gracefully close down an association.
1455	*
1456	* The syntax is:
1457	*
1458	* int close(int sd);
1459	*
1460	* sd - the socket descriptor of the association to be closed.
1461	*
1462	* After an application calls close() on a socket descriptor, no further
1463	* socket operations will succeed on that descriptor.
1464	*
1465	* API 7.1.4 SO_LINGER
1466	*
1467	* An application using the TCP-style socket can use this option to
1468	* perform the SCTP ABORT primitive. The linger option structure is:
1469	*
1470	* struct linger {
1471	* int l_onoff; // option on/off
1472	* int l_linger; // linger time
1473	* };
1474	*
1475	* To enable the option, set l_onoff to 1. If the l_linger value is set
1476	* to 0, calling close() is the same as the ABORT primitive. If the
1477	* value is set to a negative value, the setsockopt() call will return
1478	* an error. If the value is set to a positive value linger_time, the
1479	* close() can be blocked for at most linger_time ms. If the graceful
1480	* shutdown phase does not finish during this period, close() will
1481	* return but the graceful shutdown phase continues in the system.
1482	*/
1483	static void sctp_close(struct sock *sk, long timeout)
1484	{
1485	struct net *net = sock_net(sk);
1486	struct sctp_endpoint *ep;
1487	struct sctp_association *asoc;
1488	struct list_head *pos, *temp;
1489	unsigned int data_was_unread;
1490
1491	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1492
1493	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1494	sk->sk_shutdown = SHUTDOWN_MASK;
1495	inet_sk_set_state(sk, state: SCTP_SS_CLOSING);
1496
1497	ep = sctp_sk(sk)->ep;
1498
1499	/* Clean up any skbs sitting on the receive queue. */
1500	data_was_unread = sctp_queue_purge_ulpevents(list: &sk->sk_receive_queue);
1501	data_was_unread += sctp_queue_purge_ulpevents(list: &sctp_sk(sk)->pd_lobby);
1502
1503	/* Walk all associations on an endpoint. */
1504	list_for_each_safe(pos, temp, &ep->asocs) {
1505	asoc = list_entry(pos, struct sctp_association, asocs);
1506
1507	if (sctp_style(sk, TCP)) {
1508	/* A closed association can still be in the list if
1509	* it belongs to a TCP-style listening socket that is
1510	* not yet accepted. If so, free it. If not, send an
1511	* ABORT or SHUTDOWN based on the linger options.
1512	*/
1513	if (sctp_state(asoc, CLOSED)) {
1514	sctp_association_free(asoc);
1515	continue;
1516	}
1517	}
1518
1519	if (data_was_unread || !skb_queue_empty(list: &asoc->ulpq.lobby) ||
1520	!skb_queue_empty(list: &asoc->ulpq.reasm) ||
1521	!skb_queue_empty(list: &asoc->ulpq.reasm_uo) ||
1522	(sock_flag(sk, flag: SOCK_LINGER) && !sk->sk_lingertime)) {
1523	struct sctp_chunk *chunk;
1524
1525	chunk = sctp_make_abort_user(asoc, NULL, msg_len: 0);
1526	sctp_primitive_ABORT(net, asoc, arg: chunk);
1527	} else
1528	sctp_primitive_SHUTDOWN(net, asoc, NULL);
1529	}
1530
1531	/* On a TCP-style socket, block for at most linger_time if set. */
1532	if (sctp_style(sk, TCP) && timeout)
1533	sctp_wait_for_close(sk, timeo: timeout);
1534
1535	/* This will run the backlog queue. */
1536	release_sock(sk);
1537
1538	/* Supposedly, no process has access to the socket, but
1539	* the net layers still may.
1540	* Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1541	* held and that should be grabbed before socket lock.
1542	*/
1543	spin_lock_bh(lock: &net->sctp.addr_wq_lock);
1544	bh_lock_sock_nested(sk);
1545
1546	/* Hold the sock, since sk_common_release() will put sock_put()
1547	* and we have just a little more cleanup.
1548	*/
1549	sock_hold(sk);
1550	sk_common_release(sk);
1551
1552	bh_unlock_sock(sk);
1553	spin_unlock_bh(lock: &net->sctp.addr_wq_lock);
1554
1555	sock_put(sk);
1556
1557	SCTP_DBG_OBJCNT_DEC(sock);
1558	}
1559
1560	/* Handle EPIPE error. */
1561	static int sctp_error(struct sock *sk, int flags, int err)
1562	{
1563	if (err == -EPIPE)
1564	err = sock_error(sk) ? : -EPIPE;
1565	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1566	send_sig(SIGPIPE, current, 0);
1567	return err;
1568	}
1569
1570	/* API 3.1.3 sendmsg() - UDP Style Syntax
1571	*
1572	* An application uses sendmsg() and recvmsg() calls to transmit data to
1573	* and receive data from its peer.
1574	*
1575	* ssize_t sendmsg(int socket, const struct msghdr *message,
1576	* int flags);
1577	*
1578	* socket - the socket descriptor of the endpoint.
1579	* message - pointer to the msghdr structure which contains a single
1580	* user message and possibly some ancillary data.
1581	*
1582	* See Section 5 for complete description of the data
1583	* structures.
1584	*
1585	* flags - flags sent or received with the user message, see Section
1586	* 5 for complete description of the flags.
1587	*
1588	* Note: This function could use a rewrite especially when explicit
1589	* connect support comes in.
1590	*/
1591	/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1592
1593	static int sctp_msghdr_parse(const struct msghdr *msg,
1594	struct sctp_cmsgs *cmsgs);
1595
1596	static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1597	struct sctp_sndrcvinfo *srinfo,
1598	const struct msghdr *msg, size_t msg_len)
1599	{
1600	__u16 sflags;
1601	int err;
1602
1603	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1604	return -EPIPE;
1605
1606	if (msg_len > sk->sk_sndbuf)
1607	return -EMSGSIZE;
1608
1609	memset(cmsgs, 0, sizeof(*cmsgs));
1610	err = sctp_msghdr_parse(msg, cmsgs);
1611	if (err) {
1612	pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1613	return err;
1614	}
1615
1616	memset(srinfo, 0, sizeof(*srinfo));
1617	if (cmsgs->srinfo) {
1618	srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1619	srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1620	srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1621	srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1622	srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1623	srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1624	}
1625
1626	if (cmsgs->sinfo) {
1627	srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1628	srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1629	srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1630	srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1631	srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1632	}
1633
1634	if (cmsgs->prinfo) {
1635	srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1636	SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1637	cmsgs->prinfo->pr_policy);
1638	}
1639
1640	sflags = srinfo->sinfo_flags;
1641	if (!sflags && msg_len)
1642	return 0;
1643
1644	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1645	return -EINVAL;
1646
1647	if (((sflags & SCTP_EOF) && msg_len > 0) ||
1648	(!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1649	return -EINVAL;
1650
1651	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1652	return -EINVAL;
1653
1654	return 0;
1655	}
1656
1657	static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1658	struct sctp_cmsgs *cmsgs,
1659	union sctp_addr *daddr,
1660	struct sctp_transport **tp)
1661	{
1662	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1663	struct sctp_association *asoc;
1664	struct cmsghdr *cmsg;
1665	__be32 flowinfo = 0;
1666	struct sctp_af *af;
1667	int err;
1668
1669	*tp = NULL;
1670
1671	if (sflags & (SCTP_EOF | SCTP_ABORT))
1672	return -EINVAL;
1673
1674	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1675	sctp_sstate(sk, CLOSING)))
1676	return -EADDRNOTAVAIL;
1677
1678	/* Label connection socket for first association 1-to-many
1679	* style for client sequence socket()->sendmsg(). This
1680	* needs to be done before sctp_assoc_add_peer() as that will
1681	* set up the initial packet that needs to account for any
1682	* security ip options (CIPSO/CALIPSO) added to the packet.
1683	*/
1684	af = sctp_get_af_specific(daddr->sa.sa_family);
1685	if (!af)
1686	return -EINVAL;
1687	err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1688	address: (struct sockaddr *)daddr,
1689	addrlen: af->sockaddr_len);
1690	if (err < 0)
1691	return err;
1692
1693	err = sctp_connect_new_asoc(ep, daddr, init: cmsgs->init, tp);
1694	if (err)
1695	return err;
1696	asoc = (*tp)->asoc;
1697
1698	if (!cmsgs->addrs_msg)
1699	return 0;
1700
1701	if (daddr->sa.sa_family == AF_INET6)
1702	flowinfo = daddr->v6.sin6_flowinfo;
1703
1704	/* sendv addr list parse */
1705	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1706	union sctp_addr _daddr;
1707	int dlen;
1708
1709	if (cmsg->cmsg_level != IPPROTO_SCTP ||
1710	(cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1711	cmsg->cmsg_type != SCTP_DSTADDRV6))
1712	continue;
1713
1714	daddr = &_daddr;
1715	memset(daddr, 0, sizeof(*daddr));
1716	dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1717	if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1718	if (dlen < sizeof(struct in_addr)) {
1719	err = -EINVAL;
1720	goto free;
1721	}
1722
1723	dlen = sizeof(struct in_addr);
1724	daddr->v4.sin_family = AF_INET;
1725	daddr->v4.sin_port = htons(asoc->peer.port);
1726	memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1727	} else {
1728	if (dlen < sizeof(struct in6_addr)) {
1729	err = -EINVAL;
1730	goto free;
1731	}
1732
1733	dlen = sizeof(struct in6_addr);
1734	daddr->v6.sin6_flowinfo = flowinfo;
1735	daddr->v6.sin6_family = AF_INET6;
1736	daddr->v6.sin6_port = htons(asoc->peer.port);
1737	memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1738	}
1739
1740	err = sctp_connect_add_peer(asoc, daddr, addr_len: sizeof(*daddr));
1741	if (err)
1742	goto free;
1743	}
1744
1745	return 0;
1746
1747	free:
1748	sctp_association_free(asoc);
1749	return err;
1750	}
1751
1752	static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1753	__u16 sflags, struct msghdr *msg,
1754	size_t msg_len)
1755	{
1756	struct sock *sk = asoc->base.sk;
1757	struct net *net = sock_net(sk);
1758
1759	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1760	return -EPIPE;
1761
1762	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1763	!sctp_state(asoc, ESTABLISHED))
1764	return 0;
1765
1766	if (sflags & SCTP_EOF) {
1767	pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1768	sctp_primitive_SHUTDOWN(net, asoc, NULL);
1769
1770	return 0;
1771	}
1772
1773	if (sflags & SCTP_ABORT) {
1774	struct sctp_chunk *chunk;
1775
1776	chunk = sctp_make_abort_user(asoc, msg, msg_len);
1777	if (!chunk)
1778	return -ENOMEM;
1779
1780	pr_debug("%s: aborting association:%p\n", __func__, asoc);
1781	sctp_primitive_ABORT(net, asoc, arg: chunk);
1782	iov_iter_revert(i: &msg->msg_iter, bytes: msg_len);
1783
1784	return 0;
1785	}
1786
1787	return 1;
1788	}
1789
1790	static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1791	struct msghdr *msg, size_t msg_len,
1792	struct sctp_transport *transport,
1793	struct sctp_sndrcvinfo *sinfo)
1794	{
1795	struct sock *sk = asoc->base.sk;
1796	struct sctp_sock *sp = sctp_sk(sk);
1797	struct net *net = sock_net(sk);
1798	struct sctp_datamsg *datamsg;
1799	bool wait_connect = false;
1800	struct sctp_chunk *chunk;
1801	long timeo;
1802	int err;
1803
1804	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1805	err = -EINVAL;
1806	goto err;
1807	}
1808
1809	if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1810	err = sctp_stream_init_ext(stream: &asoc->stream, sid: sinfo->sinfo_stream);
1811	if (err)
1812	goto err;
1813	}
1814
1815	if (sp->disable_fragments && msg_len > asoc->frag_point) {
1816	err = -EMSGSIZE;
1817	goto err;
1818	}
1819
1820	if (asoc->pmtu_pending) {
1821	if (sp->param_flags & SPP_PMTUD_ENABLE)
1822	sctp_assoc_sync_pmtu(asoc);
1823	asoc->pmtu_pending = 0;
1824	}
1825
1826	if (sctp_wspace(asoc) < (int)msg_len)
1827	sctp_prsctp_prune(asoc, sinfo, msg_len: msg_len - sctp_wspace(asoc));
1828
1829	if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, size: msg_len)) {
1830	timeo = sock_sndtimeo(sk, noblock: msg->msg_flags & MSG_DONTWAIT);
1831	err = sctp_wait_for_sndbuf(asoc, timeo_p: &timeo, msg_len);
1832	if (err)
1833	goto err;
1834	if (unlikely(sinfo->sinfo_stream >= asoc->stream.outcnt)) {
1835	err = -EINVAL;
1836	goto err;
1837	}
1838	}
1839
1840	if (sctp_state(asoc, CLOSED)) {
1841	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1842	if (err)
1843	goto err;
1844
1845	if (asoc->ep->intl_enable) {
1846	timeo = sock_sndtimeo(sk, noblock: 0);
1847	err = sctp_wait_for_connect(asoc, timeo_p: &timeo);
1848	if (err) {
1849	err = -ESRCH;
1850	goto err;
1851	}
1852	} else {
1853	wait_connect = true;
1854	}
1855
1856	pr_debug("%s: we associated primitively\n", __func__);
1857	}
1858
1859	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1860	if (IS_ERR(ptr: datamsg)) {
1861	err = PTR_ERR(ptr: datamsg);
1862	goto err;
1863	}
1864
1865	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1866
1867	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1868	sctp_chunk_hold(chunk);
1869	sctp_set_owner_w(chunk);
1870	chunk->transport = transport;
1871	}
1872
1873	err = sctp_primitive_SEND(net, asoc, arg: datamsg);
1874	if (err) {
1875	sctp_datamsg_free(datamsg);
1876	goto err;
1877	}
1878
1879	pr_debug("%s: we sent primitively\n", __func__);
1880
1881	sctp_datamsg_put(datamsg);
1882
1883	if (unlikely(wait_connect)) {
1884	timeo = sock_sndtimeo(sk, noblock: msg->msg_flags & MSG_DONTWAIT);
1885	sctp_wait_for_connect(asoc, timeo_p: &timeo);
1886	}
1887
1888	err = msg_len;
1889
1890	err:
1891	return err;
1892	}
1893
1894	static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1895	const struct msghdr *msg,
1896	struct sctp_cmsgs *cmsgs)
1897	{
1898	union sctp_addr *daddr = NULL;
1899	int err;
1900
1901	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1902	int len = msg->msg_namelen;
1903
1904	if (len > sizeof(*daddr))
1905	len = sizeof(*daddr);
1906
1907	daddr = (union sctp_addr *)msg->msg_name;
1908
1909	err = sctp_verify_addr(sk, addr: daddr, len);
1910	if (err)
1911	return ERR_PTR(error: err);
1912	}
1913
1914	return daddr;
1915	}
1916
1917	static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1918	struct sctp_sndrcvinfo *sinfo,
1919	struct sctp_cmsgs *cmsgs)
1920	{
1921	if (!cmsgs->srinfo && !cmsgs->sinfo) {
1922	sinfo->sinfo_stream = asoc->default_stream;
1923	sinfo->sinfo_ppid = asoc->default_ppid;
1924	sinfo->sinfo_context = asoc->default_context;
1925	sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1926
1927	if (!cmsgs->prinfo)
1928	sinfo->sinfo_flags = asoc->default_flags;
1929	}
1930
1931	if (!cmsgs->srinfo && !cmsgs->prinfo)
1932	sinfo->sinfo_timetolive = asoc->default_timetolive;
1933
1934	if (cmsgs->authinfo) {
1935	/* Reuse sinfo_tsn to indicate that authinfo was set and
1936	* sinfo_ssn to save the keyid on tx path.
1937	*/
1938	sinfo->sinfo_tsn = 1;
1939	sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1940	}
1941	}
1942
1943	static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1944	{
1945	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1946	struct sctp_transport *transport = NULL;
1947	struct sctp_sndrcvinfo _sinfo, *sinfo;
1948	struct sctp_association *asoc, *tmp;
1949	struct sctp_cmsgs cmsgs;
1950	union sctp_addr *daddr;
1951	bool new = false;
1952	__u16 sflags;
1953	int err;
1954
1955	/* Parse and get snd_info */
1956	err = sctp_sendmsg_parse(sk, cmsgs: &cmsgs, srinfo: &_sinfo, msg, msg_len);
1957	if (err)
1958	goto out;
1959
1960	sinfo = &_sinfo;
1961	sflags = sinfo->sinfo_flags;
1962
1963	/* Get daddr from msg */
1964	daddr = sctp_sendmsg_get_daddr(sk, msg, cmsgs: &cmsgs);
1965	if (IS_ERR(ptr: daddr)) {
1966	err = PTR_ERR(ptr: daddr);
1967	goto out;
1968	}
1969
1970	lock_sock(sk);
1971
1972	/* SCTP_SENDALL process */
1973	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1974	list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1975	err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1976	msg_len);
1977	if (err == 0)
1978	continue;
1979	if (err < 0)
1980	goto out_unlock;
1981
1982	sctp_sendmsg_update_sinfo(asoc, sinfo, cmsgs: &cmsgs);
1983
1984	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1985	NULL, sinfo);
1986	if (err < 0)
1987	goto out_unlock;
1988
1989	iov_iter_revert(i: &msg->msg_iter, bytes: err);
1990	}
1991
1992	goto out_unlock;
1993	}
1994
1995	/* Get and check or create asoc */
1996	if (daddr) {
1997	asoc = sctp_endpoint_lookup_assoc(ep, paddr: daddr, &transport);
1998	if (asoc) {
1999	err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2000	msg_len);
2001	if (err <= 0)
2002	goto out_unlock;
2003	} else {
2004	err = sctp_sendmsg_new_asoc(sk, sflags, cmsgs: &cmsgs, daddr,
2005	tp: &transport);
2006	if (err)
2007	goto out_unlock;
2008
2009	asoc = transport->asoc;
2010	new = true;
2011	}
2012
2013	if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2014	transport = NULL;
2015	} else {
2016	asoc = sctp_id2assoc(sk, id: sinfo->sinfo_assoc_id);
2017	if (!asoc) {
2018	err = -EPIPE;
2019	goto out_unlock;
2020	}
2021
2022	err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2023	if (err <= 0)
2024	goto out_unlock;
2025	}
2026
2027	/* Update snd_info with the asoc */
2028	sctp_sendmsg_update_sinfo(asoc, sinfo, cmsgs: &cmsgs);
2029
2030	/* Send msg to the asoc */
2031	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2032	if (err < 0 && err != -ESRCH && new)
2033	sctp_association_free(asoc);
2034
2035	out_unlock:
2036	release_sock(sk);
2037	out:
2038	return sctp_error(sk, flags: msg->msg_flags, err);
2039	}
2040
2041	/* This is an extended version of skb_pull() that removes the data from the
2042	* start of a skb even when data is spread across the list of skb's in the
2043	* frag_list. len specifies the total amount of data that needs to be removed.
2044	* when 'len' bytes could be removed from the skb, it returns 0.
2045	* If 'len' exceeds the total skb length, it returns the no. of bytes that
2046	* could not be removed.
2047	*/
2048	static int sctp_skb_pull(struct sk_buff *skb, int len)
2049	{
2050	struct sk_buff *list;
2051	int skb_len = skb_headlen(skb);
2052	int rlen;
2053
2054	if (len <= skb_len) {
2055	__skb_pull(skb, len);
2056	return 0;
2057	}
2058	len -= skb_len;
2059	__skb_pull(skb, len: skb_len);
2060
2061	skb_walk_frags(skb, list) {
2062	rlen = sctp_skb_pull(skb: list, len);
2063	skb->len -= (len-rlen);
2064	skb->data_len -= (len-rlen);
2065
2066	if (!rlen)
2067	return 0;
2068
2069	len = rlen;
2070	}
2071
2072	return len;
2073	}
2074
2075	/* API 3.1.3 recvmsg() - UDP Style Syntax
2076	*
2077	* ssize_t recvmsg(int socket, struct msghdr *message,
2078	* int flags);
2079	*
2080	* socket - the socket descriptor of the endpoint.
2081	* message - pointer to the msghdr structure which contains a single
2082	* user message and possibly some ancillary data.
2083	*
2084	* See Section 5 for complete description of the data
2085	* structures.
2086	*
2087	* flags - flags sent or received with the user message, see Section
2088	* 5 for complete description of the flags.
2089	*/
2090	static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2091	int flags, int *addr_len)
2092	{
2093	struct sctp_ulpevent *event = NULL;
2094	struct sctp_sock *sp = sctp_sk(sk);
2095	struct sk_buff *skb, *head_skb;
2096	int copied;
2097	int err = 0;
2098	int skb_len;
2099
2100	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2101	__func__, sk, msg, len, flags, addr_len);
2102
2103	if (unlikely(flags & MSG_ERRQUEUE))
2104	return inet_recv_error(sk, msg, len, addr_len);
2105
2106	if (sk_can_busy_loop(sk) &&
2107	skb_queue_empty_lockless(list: &sk->sk_receive_queue))
2108	sk_busy_loop(sk, nonblock: flags & MSG_DONTWAIT);
2109
2110	lock_sock(sk);
2111
2112	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2113	!sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2114	err = -ENOTCONN;
2115	goto out;
2116	}
2117
2118	skb = sctp_skb_recv_datagram(sk, flags, &err);
2119	if (!skb)
2120	goto out;
2121
2122	/* Get the total length of the skb including any skb's in the
2123	* frag_list.
2124	*/
2125	skb_len = skb->len;
2126
2127	copied = skb_len;
2128	if (copied > len)
2129	copied = len;
2130
2131	err = skb_copy_datagram_msg(from: skb, offset: 0, msg, size: copied);
2132
2133	event = sctp_skb2event(skb);
2134
2135	if (err)
2136	goto out_free;
2137
2138	if (event->chunk && event->chunk->head_skb)
2139	head_skb = event->chunk->head_skb;
2140	else
2141	head_skb = skb;
2142	sock_recv_cmsgs(msg, sk, skb: head_skb);
2143	if (sctp_ulpevent_is_notification(event)) {
2144	msg->msg_flags |= MSG_NOTIFICATION;
2145	sp->pf->event_msgname(event, msg->msg_name, addr_len);
2146	} else {
2147	sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2148	}
2149
2150	/* Check if we allow SCTP_NXTINFO. */
2151	if (sp->recvnxtinfo)
2152	sctp_ulpevent_read_nxtinfo(event, msg, sk);
2153	/* Check if we allow SCTP_RCVINFO. */
2154	if (sp->recvrcvinfo)
2155	sctp_ulpevent_read_rcvinfo(event, msg);
2156	/* Check if we allow SCTP_SNDRCVINFO. */
2157	if (sctp_ulpevent_type_enabled(subscribe: sp->subscribe, SCTP_DATA_IO_EVENT))
2158	sctp_ulpevent_read_sndrcvinfo(event, msg);
2159
2160	err = copied;
2161
2162	/* If skb's length exceeds the user's buffer, update the skb and
2163	* push it back to the receive_queue so that the next call to
2164	* recvmsg() will return the remaining data. Don't set MSG_EOR.
2165	*/
2166	if (skb_len > copied) {
2167	msg->msg_flags &= ~MSG_EOR;
2168	if (flags & MSG_PEEK)
2169	goto out_free;
2170	sctp_skb_pull(skb, len: copied);
2171	skb_queue_head(list: &sk->sk_receive_queue, newsk: skb);
2172
2173	/* When only partial message is copied to the user, increase
2174	* rwnd by that amount. If all the data in the skb is read,
2175	* rwnd is updated when the event is freed.
2176	*/
2177	if (!sctp_ulpevent_is_notification(event))
2178	sctp_assoc_rwnd_increase(event->asoc, copied);
2179	goto out;
2180	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
2181	(event->msg_flags & MSG_EOR))
2182	msg->msg_flags |= MSG_EOR;
2183	else
2184	msg->msg_flags &= ~MSG_EOR;
2185
2186	out_free:
2187	if (flags & MSG_PEEK) {
2188	/* Release the skb reference acquired after peeking the skb in
2189	* sctp_skb_recv_datagram().
2190	*/
2191	kfree_skb(skb);
2192	} else {
2193	/* Free the event which includes releasing the reference to
2194	* the owner of the skb, freeing the skb and updating the
2195	* rwnd.
2196	*/
2197	sctp_ulpevent_free(event);
2198	}
2199	out:
2200	release_sock(sk);
2201	return err;
2202	}
2203
2204	/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2205	*
2206	* This option is a on/off flag. If enabled no SCTP message
2207	* fragmentation will be performed. Instead if a message being sent
2208	* exceeds the current PMTU size, the message will NOT be sent and
2209	* instead a error will be indicated to the user.
2210	*/
2211	static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2212	unsigned int optlen)
2213	{
2214	if (optlen < sizeof(int))
2215	return -EINVAL;
2216	sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2217	return 0;
2218	}
2219
2220	static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2221	unsigned int optlen)
2222	{
2223	struct sctp_sock *sp = sctp_sk(sk);
2224	struct sctp_association *asoc;
2225	int i;
2226
2227	if (optlen > sizeof(struct sctp_event_subscribe))
2228	return -EINVAL;
2229
2230	for (i = 0; i < optlen; i++)
2231	sctp_ulpevent_type_set(subscribe: &sp->subscribe, sn_type: SCTP_SN_TYPE_BASE + i,
2232	on: sn_type[i]);
2233
2234	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2235	asoc->subscribe = sctp_sk(sk)->subscribe;
2236
2237	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2238	* if there is no data to be sent or retransmit, the stack will
2239	* immediately send up this notification.
2240	*/
2241	if (sctp_ulpevent_type_enabled(subscribe: sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2242	struct sctp_ulpevent *event;
2243
2244	asoc = sctp_id2assoc(sk, id: 0);
2245	if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2246	event = sctp_ulpevent_make_sender_dry_event(asoc,
2247	GFP_USER | __GFP_NOWARN);
2248	if (!event)
2249	return -ENOMEM;
2250
2251	asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2252	}
2253	}
2254
2255	return 0;
2256	}
2257
2258	/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2259	*
2260	* This socket option is applicable to the UDP-style socket only. When
2261	* set it will cause associations that are idle for more than the
2262	* specified number of seconds to automatically close. An association
2263	* being idle is defined an association that has NOT sent or received
2264	* user data. The special value of '0' indicates that no automatic
2265	* close of any associations should be performed. The option expects an
2266	* integer defining the number of seconds of idle time before an
2267	* association is closed.
2268	*/
2269	static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2270	unsigned int optlen)
2271	{
2272	struct sctp_sock *sp = sctp_sk(sk);
2273	struct net *net = sock_net(sk);
2274
2275	/* Applicable to UDP-style socket only */
2276	if (sctp_style(sk, TCP))
2277	return -EOPNOTSUPP;
2278	if (optlen != sizeof(int))
2279	return -EINVAL;
2280
2281	sp->autoclose = *optval;
2282	if (sp->autoclose > net->sctp.max_autoclose)
2283	sp->autoclose = net->sctp.max_autoclose;
2284
2285	return 0;
2286	}
2287
2288	/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2289	*
2290	* Applications can enable or disable heartbeats for any peer address of
2291	* an association, modify an address's heartbeat interval, force a
2292	* heartbeat to be sent immediately, and adjust the address's maximum
2293	* number of retransmissions sent before an address is considered
2294	* unreachable. The following structure is used to access and modify an
2295	* address's parameters:
2296	*
2297	* struct sctp_paddrparams {
2298	* sctp_assoc_t spp_assoc_id;
2299	* struct sockaddr_storage spp_address;
2300	* uint32_t spp_hbinterval;
2301	* uint16_t spp_pathmaxrxt;
2302	* uint32_t spp_pathmtu;
2303	* uint32_t spp_sackdelay;
2304	* uint32_t spp_flags;
2305	* uint32_t spp_ipv6_flowlabel;
2306	* uint8_t spp_dscp;
2307	* };
2308	*
2309	* spp_assoc_id - (one-to-many style socket) This is filled in the
2310	* application, and identifies the association for
2311	* this query.
2312	* spp_address - This specifies which address is of interest.
2313	* spp_hbinterval - This contains the value of the heartbeat interval,
2314	* in milliseconds. If a value of zero
2315	* is present in this field then no changes are to
2316	* be made to this parameter.
2317	* spp_pathmaxrxt - This contains the maximum number of
2318	* retransmissions before this address shall be
2319	* considered unreachable. If a value of zero
2320	* is present in this field then no changes are to
2321	* be made to this parameter.
2322	* spp_pathmtu - When Path MTU discovery is disabled the value
2323	* specified here will be the "fixed" path mtu.
2324	* Note that if the spp_address field is empty
2325	* then all associations on this address will
2326	* have this fixed path mtu set upon them.
2327	*
2328	* spp_sackdelay - When delayed sack is enabled, this value specifies
2329	* the number of milliseconds that sacks will be delayed
2330	* for. This value will apply to all addresses of an
2331	* association if the spp_address field is empty. Note
2332	* also, that if delayed sack is enabled and this
2333	* value is set to 0, no change is made to the last
2334	* recorded delayed sack timer value.
2335	*
2336	* spp_flags - These flags are used to control various features
2337	* on an association. The flag field may contain
2338	* zero or more of the following options.
2339	*
2340	* SPP_HB_ENABLE - Enable heartbeats on the
2341	* specified address. Note that if the address
2342	* field is empty all addresses for the association
2343	* have heartbeats enabled upon them.
2344	*
2345	* SPP_HB_DISABLE - Disable heartbeats on the
2346	* speicifed address. Note that if the address
2347	* field is empty all addresses for the association
2348	* will have their heartbeats disabled. Note also
2349	* that SPP_HB_ENABLE and SPP_HB_DISABLE are
2350	* mutually exclusive, only one of these two should
2351	* be specified. Enabling both fields will have
2352	* undetermined results.
2353	*
2354	* SPP_HB_DEMAND - Request a user initiated heartbeat
2355	* to be made immediately.
2356	*
2357	* SPP_HB_TIME_IS_ZERO - Specify's that the time for
2358	* heartbeat delayis to be set to the value of 0
2359	* milliseconds.
2360	*
2361	* SPP_PMTUD_ENABLE - This field will enable PMTU
2362	* discovery upon the specified address. Note that
2363	* if the address feild is empty then all addresses
2364	* on the association are effected.
2365	*
2366	* SPP_PMTUD_DISABLE - This field will disable PMTU
2367	* discovery upon the specified address. Note that
2368	* if the address feild is empty then all addresses
2369	* on the association are effected. Not also that
2370	* SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2371	* exclusive. Enabling both will have undetermined
2372	* results.
2373	*
2374	* SPP_SACKDELAY_ENABLE - Setting this flag turns
2375	* on delayed sack. The time specified in spp_sackdelay
2376	* is used to specify the sack delay for this address. Note
2377	* that if spp_address is empty then all addresses will
2378	* enable delayed sack and take on the sack delay
2379	* value specified in spp_sackdelay.
2380	* SPP_SACKDELAY_DISABLE - Setting this flag turns
2381	* off delayed sack. If the spp_address field is blank then
2382	* delayed sack is disabled for the entire association. Note
2383	* also that this field is mutually exclusive to
2384	* SPP_SACKDELAY_ENABLE, setting both will have undefined
2385	* results.
2386	*
2387	* SPP_IPV6_FLOWLABEL: Setting this flag enables the
2388	* setting of the IPV6 flow label value. The value is
2389	* contained in the spp_ipv6_flowlabel field.
2390	* Upon retrieval, this flag will be set to indicate that
2391	* the spp_ipv6_flowlabel field has a valid value returned.
2392	* If a specific destination address is set (in the
2393	* spp_address field), then the value returned is that of
2394	* the address. If just an association is specified (and
2395	* no address), then the association's default flow label
2396	* is returned. If neither an association nor a destination
2397	* is specified, then the socket's default flow label is
2398	* returned. For non-IPv6 sockets, this flag will be left
2399	* cleared.
2400	*
2401	* SPP_DSCP: Setting this flag enables the setting of the
2402	* Differentiated Services Code Point (DSCP) value
2403	* associated with either the association or a specific
2404	* address. The value is obtained in the spp_dscp field.
2405	* Upon retrieval, this flag will be set to indicate that
2406	* the spp_dscp field has a valid value returned. If a
2407	* specific destination address is set when called (in the
2408	* spp_address field), then that specific destination
2409	* address's DSCP value is returned. If just an association
2410	* is specified, then the association's default DSCP is
2411	* returned. If neither an association nor a destination is
2412	* specified, then the socket's default DSCP is returned.
2413	*
2414	* spp_ipv6_flowlabel
2415	* - This field is used in conjunction with the
2416	* SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2417	* The 20 least significant bits are used for the flow
2418	* label. This setting has precedence over any IPv6-layer
2419	* setting.
2420	*
2421	* spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2422	* and contains the DSCP. The 6 most significant bits are
2423	* used for the DSCP. This setting has precedence over any
2424	* IPv4- or IPv6- layer setting.
2425	*/
2426	static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2427	struct sctp_transport *trans,
2428	struct sctp_association *asoc,
2429	struct sctp_sock *sp,
2430	int hb_change,
2431	int pmtud_change,
2432	int sackdelay_change)
2433	{
2434	int error;
2435
2436	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2437	error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2438	trans->asoc, arg: trans);
2439	if (error)
2440	return error;
2441	}
2442
2443	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2444	* this field is ignored. Note also that a value of zero indicates
2445	* the current setting should be left unchanged.
2446	*/
2447	if (params->spp_flags & SPP_HB_ENABLE) {
2448
2449	/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2450	* set. This lets us use 0 value when this flag
2451	* is set.
2452	*/
2453	if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2454	params->spp_hbinterval = 0;
2455
2456	if (params->spp_hbinterval ||
2457	(params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2458	if (trans) {
2459	trans->hbinterval =
2460	msecs_to_jiffies(m: params->spp_hbinterval);
2461	sctp_transport_reset_hb_timer(trans);
2462	} else if (asoc) {
2463	asoc->hbinterval =
2464	msecs_to_jiffies(m: params->spp_hbinterval);
2465	} else {
2466	sp->hbinterval = params->spp_hbinterval;
2467	}
2468	}
2469	}
2470
2471	if (hb_change) {
2472	if (trans) {
2473	trans->param_flags =
2474	(trans->param_flags & ~SPP_HB) | hb_change;
2475	} else if (asoc) {
2476	asoc->param_flags =
2477	(asoc->param_flags & ~SPP_HB) | hb_change;
2478	} else {
2479	sp->param_flags =
2480	(sp->param_flags & ~SPP_HB) | hb_change;
2481	}
2482	}
2483
2484	/* When Path MTU discovery is disabled the value specified here will
2485	* be the "fixed" path mtu (i.e. the value of the spp_flags field must
2486	* include the flag SPP_PMTUD_DISABLE for this field to have any
2487	* effect).
2488	*/
2489	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2490	if (trans) {
2491	trans->pathmtu = params->spp_pathmtu;
2492	sctp_assoc_sync_pmtu(asoc);
2493	} else if (asoc) {
2494	sctp_assoc_set_pmtu(asoc, pmtu: params->spp_pathmtu);
2495	} else {
2496	sp->pathmtu = params->spp_pathmtu;
2497	}
2498	}
2499
2500	if (pmtud_change) {
2501	if (trans) {
2502	int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2503	(params->spp_flags & SPP_PMTUD_ENABLE);
2504	trans->param_flags =
2505	(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2506	if (update) {
2507	sctp_transport_pmtu(trans, sk: sctp_opt2sk(sp));
2508	sctp_assoc_sync_pmtu(asoc);
2509	}
2510	sctp_transport_pl_reset(t: trans);
2511	} else if (asoc) {
2512	asoc->param_flags =
2513	(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2514	} else {
2515	sp->param_flags =
2516	(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2517	}
2518	}
2519
2520	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2521	* value of this field is ignored. Note also that a value of zero
2522	* indicates the current setting should be left unchanged.
2523	*/
2524	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2525	if (trans) {
2526	trans->sackdelay =
2527	msecs_to_jiffies(m: params->spp_sackdelay);
2528	} else if (asoc) {
2529	asoc->sackdelay =
2530	msecs_to_jiffies(m: params->spp_sackdelay);
2531	} else {
2532	sp->sackdelay = params->spp_sackdelay;
2533	}
2534	}
2535
2536	if (sackdelay_change) {
2537	if (trans) {
2538	trans->param_flags =
2539	(trans->param_flags & ~SPP_SACKDELAY) |
2540	sackdelay_change;
2541	} else if (asoc) {
2542	asoc->param_flags =
2543	(asoc->param_flags & ~SPP_SACKDELAY) |
2544	sackdelay_change;
2545	} else {
2546	sp->param_flags =
2547	(sp->param_flags & ~SPP_SACKDELAY) |
2548	sackdelay_change;
2549	}
2550	}
2551
2552	/* Note that a value of zero indicates the current setting should be
2553	left unchanged.
2554	*/
2555	if (params->spp_pathmaxrxt) {
2556	if (trans) {
2557	trans->pathmaxrxt = params->spp_pathmaxrxt;
2558	} else if (asoc) {
2559	asoc->pathmaxrxt = params->spp_pathmaxrxt;
2560	} else {
2561	sp->pathmaxrxt = params->spp_pathmaxrxt;
2562	}
2563	}
2564
2565	if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2566	if (trans) {
2567	if (trans->ipaddr.sa.sa_family == AF_INET6) {
2568	trans->flowlabel = params->spp_ipv6_flowlabel &
2569	SCTP_FLOWLABEL_VAL_MASK;
2570	trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571	}
2572	} else if (asoc) {
2573	struct sctp_transport *t;
2574
2575	list_for_each_entry(t, &asoc->peer.transport_addr_list,
2576	transports) {
2577	if (t->ipaddr.sa.sa_family != AF_INET6)
2578	continue;
2579	t->flowlabel = params->spp_ipv6_flowlabel &
2580	SCTP_FLOWLABEL_VAL_MASK;
2581	t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2582	}
2583	asoc->flowlabel = params->spp_ipv6_flowlabel &
2584	SCTP_FLOWLABEL_VAL_MASK;
2585	asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2586	} else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2587	sp->flowlabel = params->spp_ipv6_flowlabel &
2588	SCTP_FLOWLABEL_VAL_MASK;
2589	sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2590	}
2591	}
2592
2593	if (params->spp_flags & SPP_DSCP) {
2594	if (trans) {
2595	trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596	trans->dscp |= SCTP_DSCP_SET_MASK;
2597	} else if (asoc) {
2598	struct sctp_transport *t;
2599
2600	list_for_each_entry(t, &asoc->peer.transport_addr_list,
2601	transports) {
2602	t->dscp = params->spp_dscp &
2603	SCTP_DSCP_VAL_MASK;
2604	t->dscp |= SCTP_DSCP_SET_MASK;
2605	}
2606	asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2607	asoc->dscp |= SCTP_DSCP_SET_MASK;
2608	} else {
2609	sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2610	sp->dscp |= SCTP_DSCP_SET_MASK;
2611	}
2612	}
2613
2614	return 0;
2615	}
2616
2617	static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2618	struct sctp_paddrparams *params,
2619	unsigned int optlen)
2620	{
2621	struct sctp_transport *trans = NULL;
2622	struct sctp_association *asoc = NULL;
2623	struct sctp_sock *sp = sctp_sk(sk);
2624	int error;
2625	int hb_change, pmtud_change, sackdelay_change;
2626
2627	if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2628	spp_ipv6_flowlabel), 4)) {
2629	if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2630	return -EINVAL;
2631	} else if (optlen != sizeof(*params)) {
2632	return -EINVAL;
2633	}
2634
2635	/* Validate flags and value parameters. */
2636	hb_change = params->spp_flags & SPP_HB;
2637	pmtud_change = params->spp_flags & SPP_PMTUD;
2638	sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2639
2640	if (hb_change == SPP_HB ||
2641	pmtud_change == SPP_PMTUD ||
2642	sackdelay_change == SPP_SACKDELAY ||
2643	params->spp_sackdelay > 500 ||
2644	(params->spp_pathmtu &&
2645	params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2646	return -EINVAL;
2647
2648	/* If an address other than INADDR_ANY is specified, and
2649	* no transport is found, then the request is invalid.
2650	*/
2651	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params->spp_address)) {
2652	trans = sctp_addr_id2transport(sk, addr: &params->spp_address,
2653	id: params->spp_assoc_id);
2654	if (!trans)
2655	return -EINVAL;
2656	}
2657
2658	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2659	* socket is a one to many style socket, and an association
2660	* was not found, then the id was invalid.
2661	*/
2662	asoc = sctp_id2assoc(sk, id: params->spp_assoc_id);
2663	if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2664	sctp_style(sk, UDP))
2665	return -EINVAL;
2666
2667	/* Heartbeat demand can only be sent on a transport or
2668	* association, but not a socket.
2669	*/
2670	if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2671	return -EINVAL;
2672
2673	/* Process parameters. */
2674	error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2675	hb_change, pmtud_change,
2676	sackdelay_change);
2677
2678	if (error)
2679	return error;
2680
2681	/* If changes are for association, also apply parameters to each
2682	* transport.
2683	*/
2684	if (!trans && asoc) {
2685	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2686	transports) {
2687	sctp_apply_peer_addr_params(params, trans, asoc, sp,
2688	hb_change, pmtud_change,
2689	sackdelay_change);
2690	}
2691	}
2692
2693	return 0;
2694	}
2695
2696	static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2697	{
2698	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2699	}
2700
2701	static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2702	{
2703	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2704	}
2705
2706	static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2707	struct sctp_association *asoc)
2708	{
2709	struct sctp_transport *trans;
2710
2711	if (params->sack_delay) {
2712	asoc->sackdelay = msecs_to_jiffies(m: params->sack_delay);
2713	asoc->param_flags =
2714	sctp_spp_sackdelay_enable(param_flags: asoc->param_flags);
2715	}
2716	if (params->sack_freq == 1) {
2717	asoc->param_flags =
2718	sctp_spp_sackdelay_disable(param_flags: asoc->param_flags);
2719	} else if (params->sack_freq > 1) {
2720	asoc->sackfreq = params->sack_freq;
2721	asoc->param_flags =
2722	sctp_spp_sackdelay_enable(param_flags: asoc->param_flags);
2723	}
2724
2725	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2726	transports) {
2727	if (params->sack_delay) {
2728	trans->sackdelay = msecs_to_jiffies(m: params->sack_delay);
2729	trans->param_flags =
2730	sctp_spp_sackdelay_enable(param_flags: trans->param_flags);
2731	}
2732	if (params->sack_freq == 1) {
2733	trans->param_flags =
2734	sctp_spp_sackdelay_disable(param_flags: trans->param_flags);
2735	} else if (params->sack_freq > 1) {
2736	trans->sackfreq = params->sack_freq;
2737	trans->param_flags =
2738	sctp_spp_sackdelay_enable(param_flags: trans->param_flags);
2739	}
2740	}
2741	}
2742
2743	/*
2744	* 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2745	*
2746	* This option will effect the way delayed acks are performed. This
2747	* option allows you to get or set the delayed ack time, in
2748	* milliseconds. It also allows changing the delayed ack frequency.
2749	* Changing the frequency to 1 disables the delayed sack algorithm. If
2750	* the assoc_id is 0, then this sets or gets the endpoints default
2751	* values. If the assoc_id field is non-zero, then the set or get
2752	* effects the specified association for the one to many model (the
2753	* assoc_id field is ignored by the one to one model). Note that if
2754	* sack_delay or sack_freq are 0 when setting this option, then the
2755	* current values will remain unchanged.
2756	*
2757	* struct sctp_sack_info {
2758	* sctp_assoc_t sack_assoc_id;
2759	* uint32_t sack_delay;
2760	* uint32_t sack_freq;
2761	* };
2762	*
2763	* sack_assoc_id - This parameter, indicates which association the user
2764	* is performing an action upon. Note that if this field's value is
2765	* zero then the endpoints default value is changed (effecting future
2766	* associations only).
2767	*
2768	* sack_delay - This parameter contains the number of milliseconds that
2769	* the user is requesting the delayed ACK timer be set to. Note that
2770	* this value is defined in the standard to be between 200 and 500
2771	* milliseconds.
2772	*
2773	* sack_freq - This parameter contains the number of packets that must
2774	* be received before a sack is sent without waiting for the delay
2775	* timer to expire. The default value for this is 2, setting this
2776	* value to 1 will disable the delayed sack algorithm.
2777	*/
2778	static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2779	struct sctp_sack_info *params)
2780	{
2781	struct sctp_sock *sp = sctp_sk(sk);
2782	struct sctp_association *asoc;
2783
2784	/* Validate value parameter. */
2785	if (params->sack_delay > 500)
2786	return -EINVAL;
2787
2788	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2789	* socket is a one to many style socket, and an association
2790	* was not found, then the id was invalid.
2791	*/
2792	asoc = sctp_id2assoc(sk, id: params->sack_assoc_id);
2793	if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2794	sctp_style(sk, UDP))
2795	return -EINVAL;
2796
2797	if (asoc) {
2798	sctp_apply_asoc_delayed_ack(params, asoc);
2799
2800	return 0;
2801	}
2802
2803	if (sctp_style(sk, TCP))
2804	params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2805
2806	if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2807	params->sack_assoc_id == SCTP_ALL_ASSOC) {
2808	if (params->sack_delay) {
2809	sp->sackdelay = params->sack_delay;
2810	sp->param_flags =
2811	sctp_spp_sackdelay_enable(param_flags: sp->param_flags);
2812	}
2813	if (params->sack_freq == 1) {
2814	sp->param_flags =
2815	sctp_spp_sackdelay_disable(param_flags: sp->param_flags);
2816	} else if (params->sack_freq > 1) {
2817	sp->sackfreq = params->sack_freq;
2818	sp->param_flags =
2819	sctp_spp_sackdelay_enable(param_flags: sp->param_flags);
2820	}
2821	}
2822
2823	if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2824	params->sack_assoc_id == SCTP_ALL_ASSOC)
2825	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2826	sctp_apply_asoc_delayed_ack(params, asoc);
2827
2828	return 0;
2829	}
2830
2831	static int sctp_setsockopt_delayed_ack(struct sock *sk,
2832	struct sctp_sack_info *params,
2833	unsigned int optlen)
2834	{
2835	if (optlen == sizeof(struct sctp_assoc_value)) {
2836	struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2837	struct sctp_sack_info p;
2838
2839	pr_warn_ratelimited(DEPRECATED
2840	"%s (pid %d) "
2841	"Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2842	"Use struct sctp_sack_info instead\n",
2843	current->comm, task_pid_nr(current));
2844
2845	p.sack_assoc_id = v->assoc_id;
2846	p.sack_delay = v->assoc_value;
2847	p.sack_freq = v->assoc_value ? 0 : 1;
2848	return __sctp_setsockopt_delayed_ack(sk, params: &p);
2849	}
2850
2851	if (optlen != sizeof(struct sctp_sack_info))
2852	return -EINVAL;
2853	if (params->sack_delay == 0 && params->sack_freq == 0)
2854	return 0;
2855	return __sctp_setsockopt_delayed_ack(sk, params);
2856	}
2857
2858	/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2859	*
2860	* Applications can specify protocol parameters for the default association
2861	* initialization. The option name argument to setsockopt() and getsockopt()
2862	* is SCTP_INITMSG.
2863	*
2864	* Setting initialization parameters is effective only on an unconnected
2865	* socket (for UDP-style sockets only future associations are effected
2866	* by the change). With TCP-style sockets, this option is inherited by
2867	* sockets derived from a listener socket.
2868	*/
2869	static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2870	unsigned int optlen)
2871	{
2872	struct sctp_sock *sp = sctp_sk(sk);
2873
2874	if (optlen != sizeof(struct sctp_initmsg))
2875	return -EINVAL;
2876
2877	if (sinit->sinit_num_ostreams)
2878	sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2879	if (sinit->sinit_max_instreams)
2880	sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2881	if (sinit->sinit_max_attempts)
2882	sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2883	if (sinit->sinit_max_init_timeo)
2884	sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2885
2886	return 0;
2887	}
2888
2889	/*
2890	* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2891	*
2892	* Applications that wish to use the sendto() system call may wish to
2893	* specify a default set of parameters that would normally be supplied
2894	* through the inclusion of ancillary data. This socket option allows
2895	* such an application to set the default sctp_sndrcvinfo structure.
2896	* The application that wishes to use this socket option simply passes
2897	* in to this call the sctp_sndrcvinfo structure defined in Section
2898	* 5.2.2) The input parameters accepted by this call include
2899	* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2900	* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2901	* to this call if the caller is using the UDP model.
2902	*/
2903	static int sctp_setsockopt_default_send_param(struct sock *sk,
2904	struct sctp_sndrcvinfo *info,
2905	unsigned int optlen)
2906	{
2907	struct sctp_sock *sp = sctp_sk(sk);
2908	struct sctp_association *asoc;
2909
2910	if (optlen != sizeof(*info))
2911	return -EINVAL;
2912	if (info->sinfo_flags &
2913	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2914	SCTP_ABORT | SCTP_EOF))
2915	return -EINVAL;
2916
2917	asoc = sctp_id2assoc(sk, id: info->sinfo_assoc_id);
2918	if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2919	sctp_style(sk, UDP))
2920	return -EINVAL;
2921
2922	if (asoc) {
2923	asoc->default_stream = info->sinfo_stream;
2924	asoc->default_flags = info->sinfo_flags;
2925	asoc->default_ppid = info->sinfo_ppid;
2926	asoc->default_context = info->sinfo_context;
2927	asoc->default_timetolive = info->sinfo_timetolive;
2928
2929	return 0;
2930	}
2931
2932	if (sctp_style(sk, TCP))
2933	info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2934
2935	if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2936	info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2937	sp->default_stream = info->sinfo_stream;
2938	sp->default_flags = info->sinfo_flags;
2939	sp->default_ppid = info->sinfo_ppid;
2940	sp->default_context = info->sinfo_context;
2941	sp->default_timetolive = info->sinfo_timetolive;
2942	}
2943
2944	if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2945	info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2946	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2947	asoc->default_stream = info->sinfo_stream;
2948	asoc->default_flags = info->sinfo_flags;
2949	asoc->default_ppid = info->sinfo_ppid;
2950	asoc->default_context = info->sinfo_context;
2951	asoc->default_timetolive = info->sinfo_timetolive;
2952	}
2953	}
2954
2955	return 0;
2956	}
2957
2958	/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2959	* (SCTP_DEFAULT_SNDINFO)
2960	*/
2961	static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2962	struct sctp_sndinfo *info,
2963	unsigned int optlen)
2964	{
2965	struct sctp_sock *sp = sctp_sk(sk);
2966	struct sctp_association *asoc;
2967
2968	if (optlen != sizeof(*info))
2969	return -EINVAL;
2970	if (info->snd_flags &
2971	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2972	SCTP_ABORT | SCTP_EOF))
2973	return -EINVAL;
2974
2975	asoc = sctp_id2assoc(sk, id: info->snd_assoc_id);
2976	if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2977	sctp_style(sk, UDP))
2978	return -EINVAL;
2979
2980	if (asoc) {
2981	asoc->default_stream = info->snd_sid;
2982	asoc->default_flags = info->snd_flags;
2983	asoc->default_ppid = info->snd_ppid;
2984	asoc->default_context = info->snd_context;
2985
2986	return 0;
2987	}
2988
2989	if (sctp_style(sk, TCP))
2990	info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2991
2992	if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2993	info->snd_assoc_id == SCTP_ALL_ASSOC) {
2994	sp->default_stream = info->snd_sid;
2995	sp->default_flags = info->snd_flags;
2996	sp->default_ppid = info->snd_ppid;
2997	sp->default_context = info->snd_context;
2998	}
2999
3000	if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
3001	info->snd_assoc_id == SCTP_ALL_ASSOC) {
3002	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3003	asoc->default_stream = info->snd_sid;
3004	asoc->default_flags = info->snd_flags;
3005	asoc->default_ppid = info->snd_ppid;
3006	asoc->default_context = info->snd_context;
3007	}
3008	}
3009
3010	return 0;
3011	}
3012
3013	/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3014	*
3015	* Requests that the local SCTP stack use the enclosed peer address as
3016	* the association primary. The enclosed address must be one of the
3017	* association peer's addresses.
3018	*/
3019	static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3020	unsigned int optlen)
3021	{
3022	struct sctp_transport *trans;
3023	struct sctp_af *af;
3024	int err;
3025
3026	if (optlen != sizeof(struct sctp_prim))
3027	return -EINVAL;
3028
3029	/* Allow security module to validate address but need address len. */
3030	af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3031	if (!af)
3032	return -EINVAL;
3033
3034	err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3035	address: (struct sockaddr *)&prim->ssp_addr,
3036	addrlen: af->sockaddr_len);
3037	if (err)
3038	return err;
3039
3040	trans = sctp_addr_id2transport(sk, addr: &prim->ssp_addr, id: prim->ssp_assoc_id);
3041	if (!trans)
3042	return -EINVAL;
3043
3044	sctp_assoc_set_primary(trans->asoc, trans);
3045
3046	return 0;
3047	}
3048
3049	/*
3050	* 7.1.5 SCTP_NODELAY
3051	*
3052	* Turn on/off any Nagle-like algorithm. This means that packets are
3053	* generally sent as soon as possible and no unnecessary delays are
3054	* introduced, at the cost of more packets in the network. Expects an
3055	* integer boolean flag.
3056	*/
3057	static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3058	unsigned int optlen)
3059	{
3060	if (optlen < sizeof(int))
3061	return -EINVAL;
3062	sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3063	return 0;
3064	}
3065
3066	/*
3067	*
3068	* 7.1.1 SCTP_RTOINFO
3069	*
3070	* The protocol parameters used to initialize and bound retransmission
3071	* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3072	* and modify these parameters.
3073	* All parameters are time values, in milliseconds. A value of 0, when
3074	* modifying the parameters, indicates that the current value should not
3075	* be changed.
3076	*
3077	*/
3078	static int sctp_setsockopt_rtoinfo(struct sock *sk,
3079	struct sctp_rtoinfo *rtoinfo,
3080	unsigned int optlen)
3081	{
3082	struct sctp_association *asoc;
3083	unsigned long rto_min, rto_max;
3084	struct sctp_sock *sp = sctp_sk(sk);
3085
3086	if (optlen != sizeof (struct sctp_rtoinfo))
3087	return -EINVAL;
3088
3089	asoc = sctp_id2assoc(sk, id: rtoinfo->srto_assoc_id);
3090
3091	/* Set the values to the specific association */
3092	if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3093	sctp_style(sk, UDP))
3094	return -EINVAL;
3095
3096	rto_max = rtoinfo->srto_max;
3097	rto_min = rtoinfo->srto_min;
3098
3099	if (rto_max)
3100	rto_max = asoc ? msecs_to_jiffies(m: rto_max) : rto_max;
3101	else
3102	rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3103
3104	if (rto_min)
3105	rto_min = asoc ? msecs_to_jiffies(m: rto_min) : rto_min;
3106	else
3107	rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3108
3109	if (rto_min > rto_max)
3110	return -EINVAL;
3111
3112	if (asoc) {
3113	if (rtoinfo->srto_initial != 0)
3114	asoc->rto_initial =
3115	msecs_to_jiffies(m: rtoinfo->srto_initial);
3116	asoc->rto_max = rto_max;
3117	asoc->rto_min = rto_min;
3118	} else {
3119	/* If there is no association or the association-id = 0
3120	* set the values to the endpoint.
3121	*/
3122	if (rtoinfo->srto_initial != 0)
3123	sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3124	sp->rtoinfo.srto_max = rto_max;
3125	sp->rtoinfo.srto_min = rto_min;
3126	}
3127
3128	return 0;
3129	}
3130
3131	/*
3132	*
3133	* 7.1.2 SCTP_ASSOCINFO
3134	*
3135	* This option is used to tune the maximum retransmission attempts
3136	* of the association.
3137	* Returns an error if the new association retransmission value is
3138	* greater than the sum of the retransmission value of the peer.
3139	* See [SCTP] for more information.
3140	*
3141	*/
3142	static int sctp_setsockopt_associnfo(struct sock *sk,
3143	struct sctp_assocparams *assocparams,
3144	unsigned int optlen)
3145	{
3146
3147	struct sctp_association *asoc;
3148
3149	if (optlen != sizeof(struct sctp_assocparams))
3150	return -EINVAL;
3151
3152	asoc = sctp_id2assoc(sk, id: assocparams->sasoc_assoc_id);
3153
3154	if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3155	sctp_style(sk, UDP))
3156	return -EINVAL;
3157
3158	/* Set the values to the specific association */
3159	if (asoc) {
3160	if (assocparams->sasoc_asocmaxrxt != 0) {
3161	__u32 path_sum = 0;
3162	int paths = 0;
3163	struct sctp_transport *peer_addr;
3164
3165	list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3166	transports) {
3167	path_sum += peer_addr->pathmaxrxt;
3168	paths++;
3169	}
3170
3171	/* Only validate asocmaxrxt if we have more than
3172	* one path/transport. We do this because path
3173	* retransmissions are only counted when we have more
3174	* then one path.
3175	*/
3176	if (paths > 1 &&
3177	assocparams->sasoc_asocmaxrxt > path_sum)
3178	return -EINVAL;
3179
3180	asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3181	}
3182
3183	if (assocparams->sasoc_cookie_life != 0)
3184	asoc->cookie_life =
3185	ms_to_ktime(ms: assocparams->sasoc_cookie_life);
3186	} else {
3187	/* Set the values to the endpoint */
3188	struct sctp_sock *sp = sctp_sk(sk);
3189
3190	if (assocparams->sasoc_asocmaxrxt != 0)
3191	sp->assocparams.sasoc_asocmaxrxt =
3192	assocparams->sasoc_asocmaxrxt;
3193	if (assocparams->sasoc_cookie_life != 0)
3194	sp->assocparams.sasoc_cookie_life =
3195	assocparams->sasoc_cookie_life;
3196	}
3197	return 0;
3198	}
3199
3200	/*
3201	* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3202	*
3203	* This socket option is a boolean flag which turns on or off mapped V4
3204	* addresses. If this option is turned on and the socket is type
3205	* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3206	* If this option is turned off, then no mapping will be done of V4
3207	* addresses and a user will receive both PF_INET6 and PF_INET type
3208	* addresses on the socket.
3209	*/
3210	static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3211	unsigned int optlen)
3212	{
3213	struct sctp_sock *sp = sctp_sk(sk);
3214
3215	if (optlen < sizeof(int))
3216	return -EINVAL;
3217	if (*val)
3218	sp->v4mapped = 1;
3219	else
3220	sp->v4mapped = 0;
3221
3222	return 0;
3223	}
3224
3225	/*
3226	* 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3227	* This option will get or set the maximum size to put in any outgoing
3228	* SCTP DATA chunk. If a message is larger than this size it will be
3229	* fragmented by SCTP into the specified size. Note that the underlying
3230	* SCTP implementation may fragment into smaller sized chunks when the
3231	* PMTU of the underlying association is smaller than the value set by
3232	* the user. The default value for this option is '0' which indicates
3233	* the user is NOT limiting fragmentation and only the PMTU will effect
3234	* SCTP's choice of DATA chunk size. Note also that values set larger
3235	* than the maximum size of an IP datagram will effectively let SCTP
3236	* control fragmentation (i.e. the same as setting this option to 0).
3237	*
3238	* The following structure is used to access and modify this parameter:
3239	*
3240	* struct sctp_assoc_value {
3241	* sctp_assoc_t assoc_id;
3242	* uint32_t assoc_value;
3243	* };
3244	*
3245	* assoc_id: This parameter is ignored for one-to-one style sockets.
3246	* For one-to-many style sockets this parameter indicates which
3247	* association the user is performing an action upon. Note that if
3248	* this field's value is zero then the endpoints default value is
3249	* changed (effecting future associations only).
3250	* assoc_value: This parameter specifies the maximum size in bytes.
3251	*/
3252	static int sctp_setsockopt_maxseg(struct sock *sk,
3253	struct sctp_assoc_value *params,
3254	unsigned int optlen)
3255	{
3256	struct sctp_sock *sp = sctp_sk(sk);
3257	struct sctp_association *asoc;
3258	sctp_assoc_t assoc_id;
3259	int val;
3260
3261	if (optlen == sizeof(int)) {
3262	pr_warn_ratelimited(DEPRECATED
3263	"%s (pid %d) "
3264	"Use of int in maxseg socket option.\n"
3265	"Use struct sctp_assoc_value instead\n",
3266	current->comm, task_pid_nr(current));
3267	assoc_id = SCTP_FUTURE_ASSOC;
3268	val = *(int *)params;
3269	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3270	assoc_id = params->assoc_id;
3271	val = params->assoc_value;
3272	} else {
3273	return -EINVAL;
3274	}
3275
3276	asoc = sctp_id2assoc(sk, id: assoc_id);
3277	if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3278	sctp_style(sk, UDP))
3279	return -EINVAL;
3280
3281	if (val) {
3282	int min_len, max_len;
3283	__u16 datasize = asoc ? sctp_datachk_len(stream: &asoc->stream) :
3284	sizeof(struct sctp_data_chunk);
3285
3286	min_len = sctp_min_frag_point(sp, datasize);
3287	max_len = SCTP_MAX_CHUNK_LEN - datasize;
3288
3289	if (val < min_len || val > max_len)
3290	return -EINVAL;
3291	}
3292
3293	if (asoc) {
3294	asoc->user_frag = val;
3295	sctp_assoc_update_frag_point(asoc);
3296	} else {
3297	sp->user_frag = val;
3298	}
3299
3300	return 0;
3301	}
3302
3303
3304	/*
3305	* 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3306	*
3307	* Requests that the peer mark the enclosed address as the association
3308	* primary. The enclosed address must be one of the association's
3309	* locally bound addresses. The following structure is used to make a
3310	* set primary request:
3311	*/
3312	static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3313	struct sctp_setpeerprim *prim,
3314	unsigned int optlen)
3315	{
3316	struct sctp_sock *sp;
3317	struct sctp_association *asoc = NULL;
3318	struct sctp_chunk *chunk;
3319	struct sctp_af *af;
3320	int err;
3321
3322	sp = sctp_sk(sk);
3323
3324	if (!sp->ep->asconf_enable)
3325	return -EPERM;
3326
3327	if (optlen != sizeof(struct sctp_setpeerprim))
3328	return -EINVAL;
3329
3330	asoc = sctp_id2assoc(sk, id: prim->sspp_assoc_id);
3331	if (!asoc)
3332	return -EINVAL;
3333
3334	if (!asoc->peer.asconf_capable)
3335	return -EPERM;
3336
3337	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3338	return -EPERM;
3339
3340	if (!sctp_state(asoc, ESTABLISHED))
3341	return -ENOTCONN;
3342
3343	af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3344	if (!af)
3345	return -EINVAL;
3346
3347	if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3348	return -EADDRNOTAVAIL;
3349
3350	if (!sctp_assoc_lookup_laddr(asoc, laddr: (union sctp_addr *)&prim->sspp_addr))
3351	return -EADDRNOTAVAIL;
3352
3353	/* Allow security module to validate address. */
3354	err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3355	address: (struct sockaddr *)&prim->sspp_addr,
3356	addrlen: af->sockaddr_len);
3357	if (err)
3358	return err;
3359
3360	/* Create an ASCONF chunk with SET_PRIMARY parameter */
3361	chunk = sctp_make_asconf_set_prim(asoc,
3362	addr: (union sctp_addr *)&prim->sspp_addr);
3363	if (!chunk)
3364	return -ENOMEM;
3365
3366	err = sctp_send_asconf(asoc, chunk);
3367
3368	pr_debug("%s: we set peer primary addr primitively\n", __func__);
3369
3370	return err;
3371	}
3372
3373	static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3374	struct sctp_setadaptation *adapt,
3375	unsigned int optlen)
3376	{
3377	if (optlen != sizeof(struct sctp_setadaptation))
3378	return -EINVAL;
3379
3380	sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3381
3382	return 0;
3383	}
3384
3385	/*
3386	* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3387	*
3388	* The context field in the sctp_sndrcvinfo structure is normally only
3389	* used when a failed message is retrieved holding the value that was
3390	* sent down on the actual send call. This option allows the setting of
3391	* a default context on an association basis that will be received on
3392	* reading messages from the peer. This is especially helpful in the
3393	* one-2-many model for an application to keep some reference to an
3394	* internal state machine that is processing messages on the
3395	* association. Note that the setting of this value only effects
3396	* received messages from the peer and does not effect the value that is
3397	* saved with outbound messages.
3398	*/
3399	static int sctp_setsockopt_context(struct sock *sk,
3400	struct sctp_assoc_value *params,
3401	unsigned int optlen)
3402	{
3403	struct sctp_sock *sp = sctp_sk(sk);
3404	struct sctp_association *asoc;
3405
3406	if (optlen != sizeof(struct sctp_assoc_value))
3407	return -EINVAL;
3408
3409	asoc = sctp_id2assoc(sk, id: params->assoc_id);
3410	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3411	sctp_style(sk, UDP))
3412	return -EINVAL;
3413
3414	if (asoc) {
3415	asoc->default_rcv_context = params->assoc_value;
3416
3417	return 0;
3418	}
3419
3420	if (sctp_style(sk, TCP))
3421	params->assoc_id = SCTP_FUTURE_ASSOC;
3422
3423	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3424	params->assoc_id == SCTP_ALL_ASSOC)
3425	sp->default_rcv_context = params->assoc_value;
3426
3427	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3428	params->assoc_id == SCTP_ALL_ASSOC)
3429	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3430	asoc->default_rcv_context = params->assoc_value;
3431
3432	return 0;
3433	}
3434
3435	/*
3436	* 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3437	*
3438	* This options will at a minimum specify if the implementation is doing
3439	* fragmented interleave. Fragmented interleave, for a one to many
3440	* socket, is when subsequent calls to receive a message may return
3441	* parts of messages from different associations. Some implementations
3442	* may allow you to turn this value on or off. If so, when turned off,
3443	* no fragment interleave will occur (which will cause a head of line
3444	* blocking amongst multiple associations sharing the same one to many
3445	* socket). When this option is turned on, then each receive call may
3446	* come from a different association (thus the user must receive data
3447	* with the extended calls (e.g. sctp_recvmsg) to keep track of which
3448	* association each receive belongs to.
3449	*
3450	* This option takes a boolean value. A non-zero value indicates that
3451	* fragmented interleave is on. A value of zero indicates that
3452	* fragmented interleave is off.
3453	*
3454	* Note that it is important that an implementation that allows this
3455	* option to be turned on, have it off by default. Otherwise an unaware
3456	* application using the one to many model may become confused and act
3457	* incorrectly.
3458	*/
3459	static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3460	unsigned int optlen)
3461	{
3462	if (optlen != sizeof(int))
3463	return -EINVAL;
3464
3465	sctp_sk(sk)->frag_interleave = !!*val;
3466
3467	if (!sctp_sk(sk)->frag_interleave)
3468	sctp_sk(sk)->ep->intl_enable = 0;
3469
3470	return 0;
3471	}
3472
3473	/*
3474	* 8.1.21. Set or Get the SCTP Partial Delivery Point
3475	* (SCTP_PARTIAL_DELIVERY_POINT)
3476	*
3477	* This option will set or get the SCTP partial delivery point. This
3478	* point is the size of a message where the partial delivery API will be
3479	* invoked to help free up rwnd space for the peer. Setting this to a
3480	* lower value will cause partial deliveries to happen more often. The
3481	* calls argument is an integer that sets or gets the partial delivery
3482	* point. Note also that the call will fail if the user attempts to set
3483	* this value larger than the socket receive buffer size.
3484	*
3485	* Note that any single message having a length smaller than or equal to
3486	* the SCTP partial delivery point will be delivered in one single read
3487	* call as long as the user provided buffer is large enough to hold the
3488	* message.
3489	*/
3490	static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3491	unsigned int optlen)
3492	{
3493	if (optlen != sizeof(u32))
3494	return -EINVAL;
3495
3496	/* Note: We double the receive buffer from what the user sets
3497	* it to be, also initial rwnd is based on rcvbuf/2.
3498	*/
3499	if (*val > (sk->sk_rcvbuf >> 1))
3500	return -EINVAL;
3501
3502	sctp_sk(sk)->pd_point = *val;
3503
3504	return 0; /* is this the right error code? */
3505	}
3506
3507	/*
3508	* 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3509	*
3510	* This option will allow a user to change the maximum burst of packets
3511	* that can be emitted by this association. Note that the default value
3512	* is 4, and some implementations may restrict this setting so that it
3513	* can only be lowered.
3514	*
3515	* NOTE: This text doesn't seem right. Do this on a socket basis with
3516	* future associations inheriting the socket value.
3517	*/
3518	static int sctp_setsockopt_maxburst(struct sock *sk,
3519	struct sctp_assoc_value *params,
3520	unsigned int optlen)
3521	{
3522	struct sctp_sock *sp = sctp_sk(sk);
3523	struct sctp_association *asoc;
3524	sctp_assoc_t assoc_id;
3525	u32 assoc_value;
3526
3527	if (optlen == sizeof(int)) {
3528	pr_warn_ratelimited(DEPRECATED
3529	"%s (pid %d) "
3530	"Use of int in max_burst socket option deprecated.\n"
3531	"Use struct sctp_assoc_value instead\n",
3532	current->comm, task_pid_nr(current));
3533	assoc_id = SCTP_FUTURE_ASSOC;
3534	assoc_value = *((int *)params);
3535	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3536	assoc_id = params->assoc_id;
3537	assoc_value = params->assoc_value;
3538	} else
3539	return -EINVAL;
3540
3541	asoc = sctp_id2assoc(sk, id: assoc_id);
3542	if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3543	return -EINVAL;
3544
3545	if (asoc) {
3546	asoc->max_burst = assoc_value;
3547
3548	return 0;
3549	}
3550
3551	if (sctp_style(sk, TCP))
3552	assoc_id = SCTP_FUTURE_ASSOC;
3553
3554	if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3555	sp->max_burst = assoc_value;
3556
3557	if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3558	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3559	asoc->max_burst = assoc_value;
3560
3561	return 0;
3562	}
3563
3564	/*
3565	* 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3566	*
3567	* This set option adds a chunk type that the user is requesting to be
3568	* received only in an authenticated way. Changes to the list of chunks
3569	* will only effect future associations on the socket.
3570	*/
3571	static int sctp_setsockopt_auth_chunk(struct sock *sk,
3572	struct sctp_authchunk *val,
3573	unsigned int optlen)
3574	{
3575	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3576
3577	if (!ep->auth_enable)
3578	return -EACCES;
3579
3580	if (optlen != sizeof(struct sctp_authchunk))
3581	return -EINVAL;
3582
3583	switch (val->sauth_chunk) {
3584	case SCTP_CID_INIT:
3585	case SCTP_CID_INIT_ACK:
3586	case SCTP_CID_SHUTDOWN_COMPLETE:
3587	case SCTP_CID_AUTH:
3588	return -EINVAL;
3589	}
3590
3591	/* add this chunk id to the endpoint */
3592	return sctp_auth_ep_add_chunkid(ep, chunk_id: val->sauth_chunk);
3593	}
3594
3595	/*
3596	* 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3597	*
3598	* This option gets or sets the list of HMAC algorithms that the local
3599	* endpoint requires the peer to use.
3600	*/
3601	static int sctp_setsockopt_hmac_ident(struct sock *sk,
3602	struct sctp_hmacalgo *hmacs,
3603	unsigned int optlen)
3604	{
3605	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3606	u32 idents;
3607
3608	if (!ep->auth_enable)
3609	return -EACCES;
3610
3611	if (optlen < sizeof(struct sctp_hmacalgo))
3612	return -EINVAL;
3613	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3614	SCTP_AUTH_NUM_HMACS * sizeof(u16));
3615
3616	idents = hmacs->shmac_num_idents;
3617	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3618	(idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3619	return -EINVAL;
3620
3621	return sctp_auth_ep_set_hmacs(ep, hmacs);
3622	}
3623
3624	/*
3625	* 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3626	*
3627	* This option will set a shared secret key which is used to build an
3628	* association shared key.
3629	*/
3630	static int sctp_setsockopt_auth_key(struct sock *sk,
3631	struct sctp_authkey *authkey,
3632	unsigned int optlen)
3633	{
3634	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3635	struct sctp_association *asoc;
3636	int ret = -EINVAL;
3637
3638	if (optlen <= sizeof(struct sctp_authkey))
3639	return -EINVAL;
3640	/* authkey->sca_keylength is u16, so optlen can't be bigger than
3641	* this.
3642	*/
3643	optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3644
3645	if (authkey->sca_keylength > optlen - sizeof(*authkey))
3646	goto out;
3647
3648	asoc = sctp_id2assoc(sk, id: authkey->sca_assoc_id);
3649	if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3650	sctp_style(sk, UDP))
3651	goto out;
3652
3653	if (asoc) {
3654	ret = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3655	goto out;
3656	}
3657
3658	if (sctp_style(sk, TCP))
3659	authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3660
3661	if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3662	authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3663	ret = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3664	if (ret)
3665	goto out;
3666	}
3667
3668	ret = 0;
3669
3670	if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3671	authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3672	list_for_each_entry(asoc, &ep->asocs, asocs) {
3673	int res = sctp_auth_set_key(ep, asoc, auth_key: authkey);
3674
3675	if (res && !ret)
3676	ret = res;
3677	}
3678	}
3679
3680	out:
3681	memzero_explicit(s: authkey, count: optlen);
3682	return ret;
3683	}
3684
3685	/*
3686	* 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3687	*
3688	* This option will get or set the active shared key to be used to build
3689	* the association shared key.
3690	*/
3691	static int sctp_setsockopt_active_key(struct sock *sk,
3692	struct sctp_authkeyid *val,
3693	unsigned int optlen)
3694	{
3695	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3696	struct sctp_association *asoc;
3697	int ret = 0;
3698
3699	if (optlen != sizeof(struct sctp_authkeyid))
3700	return -EINVAL;
3701
3702	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3703	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3704	sctp_style(sk, UDP))
3705	return -EINVAL;
3706
3707	if (asoc)
3708	return sctp_auth_set_active_key(ep, asoc, key_id: val->scact_keynumber);
3709
3710	if (sctp_style(sk, TCP))
3711	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3712
3713	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3714	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3715	ret = sctp_auth_set_active_key(ep, asoc, key_id: val->scact_keynumber);
3716	if (ret)
3717	return ret;
3718	}
3719
3720	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3721	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3722	list_for_each_entry(asoc, &ep->asocs, asocs) {
3723	int res = sctp_auth_set_active_key(ep, asoc,
3724	key_id: val->scact_keynumber);
3725
3726	if (res && !ret)
3727	ret = res;
3728	}
3729	}
3730
3731	return ret;
3732	}
3733
3734	/*
3735	* 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3736	*
3737	* This set option will delete a shared secret key from use.
3738	*/
3739	static int sctp_setsockopt_del_key(struct sock *sk,
3740	struct sctp_authkeyid *val,
3741	unsigned int optlen)
3742	{
3743	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3744	struct sctp_association *asoc;
3745	int ret = 0;
3746
3747	if (optlen != sizeof(struct sctp_authkeyid))
3748	return -EINVAL;
3749
3750	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3751	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3752	sctp_style(sk, UDP))
3753	return -EINVAL;
3754
3755	if (asoc)
3756	return sctp_auth_del_key_id(ep, asoc, key_id: val->scact_keynumber);
3757
3758	if (sctp_style(sk, TCP))
3759	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3760
3761	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3762	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3763	ret = sctp_auth_del_key_id(ep, asoc, key_id: val->scact_keynumber);
3764	if (ret)
3765	return ret;
3766	}
3767
3768	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3769	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3770	list_for_each_entry(asoc, &ep->asocs, asocs) {
3771	int res = sctp_auth_del_key_id(ep, asoc,
3772	key_id: val->scact_keynumber);
3773
3774	if (res && !ret)
3775	ret = res;
3776	}
3777	}
3778
3779	return ret;
3780	}
3781
3782	/*
3783	* 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3784	*
3785	* This set option will deactivate a shared secret key.
3786	*/
3787	static int sctp_setsockopt_deactivate_key(struct sock *sk,
3788	struct sctp_authkeyid *val,
3789	unsigned int optlen)
3790	{
3791	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3792	struct sctp_association *asoc;
3793	int ret = 0;
3794
3795	if (optlen != sizeof(struct sctp_authkeyid))
3796	return -EINVAL;
3797
3798	asoc = sctp_id2assoc(sk, id: val->scact_assoc_id);
3799	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3800	sctp_style(sk, UDP))
3801	return -EINVAL;
3802
3803	if (asoc)
3804	return sctp_auth_deact_key_id(ep, asoc, key_id: val->scact_keynumber);
3805
3806	if (sctp_style(sk, TCP))
3807	val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3808
3809	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3810	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3811	ret = sctp_auth_deact_key_id(ep, asoc, key_id: val->scact_keynumber);
3812	if (ret)
3813	return ret;
3814	}
3815
3816	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3817	val->scact_assoc_id == SCTP_ALL_ASSOC) {
3818	list_for_each_entry(asoc, &ep->asocs, asocs) {
3819	int res = sctp_auth_deact_key_id(ep, asoc,
3820	key_id: val->scact_keynumber);
3821
3822	if (res && !ret)
3823	ret = res;
3824	}
3825	}
3826
3827	return ret;
3828	}
3829
3830	/*
3831	* 8.1.23 SCTP_AUTO_ASCONF
3832	*
3833	* This option will enable or disable the use of the automatic generation of
3834	* ASCONF chunks to add and delete addresses to an existing association. Note
3835	* that this option has two caveats namely: a) it only affects sockets that
3836	* are bound to all addresses available to the SCTP stack, and b) the system
3837	* administrator may have an overriding control that turns the ASCONF feature
3838	* off no matter what setting the socket option may have.
3839	* This option expects an integer boolean flag, where a non-zero value turns on
3840	* the option, and a zero value turns off the option.
3841	* Note. In this implementation, socket operation overrides default parameter
3842	* being set by sysctl as well as FreeBSD implementation
3843	*/
3844	static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3845	unsigned int optlen)
3846	{
3847	struct sctp_sock *sp = sctp_sk(sk);
3848
3849	if (optlen < sizeof(int))
3850	return -EINVAL;
3851	if (!sctp_is_ep_boundall(sk) && *val)
3852	return -EINVAL;
3853	if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3854	return 0;
3855
3856	spin_lock_bh(lock: &sock_net(sk)->sctp.addr_wq_lock);
3857	if (*val == 0 && sp->do_auto_asconf) {
3858	list_del(entry: &sp->auto_asconf_list);
3859	sp->do_auto_asconf = 0;
3860	} else if (*val && !sp->do_auto_asconf) {
3861	list_add_tail(new: &sp->auto_asconf_list,
3862	head: &sock_net(sk)->sctp.auto_asconf_splist);
3863	sp->do_auto_asconf = 1;
3864	}
3865	spin_unlock_bh(lock: &sock_net(sk)->sctp.addr_wq_lock);
3866	return 0;
3867	}
3868
3869	/*
3870	* SCTP_PEER_ADDR_THLDS
3871	*
3872	* This option allows us to alter the partially failed threshold for one or all
3873	* transports in an association. See Section 6.1 of:
3874	* http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3875	*/
3876	static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3877	struct sctp_paddrthlds_v2 *val,
3878	unsigned int optlen, bool v2)
3879	{
3880	struct sctp_transport *trans;
3881	struct sctp_association *asoc;
3882	int len;
3883
3884	len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3885	if (optlen < len)
3886	return -EINVAL;
3887
3888	if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3889	return -EINVAL;
3890
3891	if (!sctp_is_any(sk, addr: (const union sctp_addr *)&val->spt_address)) {
3892	trans = sctp_addr_id2transport(sk, addr: &val->spt_address,
3893	id: val->spt_assoc_id);
3894	if (!trans)
3895	return -ENOENT;
3896
3897	if (val->spt_pathmaxrxt)
3898	trans->pathmaxrxt = val->spt_pathmaxrxt;
3899	if (v2)
3900	trans->ps_retrans = val->spt_pathcpthld;
3901	trans->pf_retrans = val->spt_pathpfthld;
3902
3903	return 0;
3904	}
3905
3906	asoc = sctp_id2assoc(sk, id: val->spt_assoc_id);
3907	if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3908	sctp_style(sk, UDP))
3909	return -EINVAL;
3910
3911	if (asoc) {
3912	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3913	transports) {
3914	if (val->spt_pathmaxrxt)
3915	trans->pathmaxrxt = val->spt_pathmaxrxt;
3916	if (v2)
3917	trans->ps_retrans = val->spt_pathcpthld;
3918	trans->pf_retrans = val->spt_pathpfthld;
3919	}
3920
3921	if (val->spt_pathmaxrxt)
3922	asoc->pathmaxrxt = val->spt_pathmaxrxt;
3923	if (v2)
3924	asoc->ps_retrans = val->spt_pathcpthld;
3925	asoc->pf_retrans = val->spt_pathpfthld;
3926	} else {
3927	struct sctp_sock *sp = sctp_sk(sk);
3928
3929	if (val->spt_pathmaxrxt)
3930	sp->pathmaxrxt = val->spt_pathmaxrxt;
3931	if (v2)
3932	sp->ps_retrans = val->spt_pathcpthld;
3933	sp->pf_retrans = val->spt_pathpfthld;
3934	}
3935
3936	return 0;
3937	}
3938
3939	static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3940	unsigned int optlen)
3941	{
3942	if (optlen < sizeof(int))
3943	return -EINVAL;
3944
3945	sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3946
3947	return 0;
3948	}
3949
3950	static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3951	unsigned int optlen)
3952	{
3953	if (optlen < sizeof(int))
3954	return -EINVAL;
3955
3956	sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3957
3958	return 0;
3959	}
3960
3961	static int sctp_setsockopt_pr_supported(struct sock *sk,
3962	struct sctp_assoc_value *params,
3963	unsigned int optlen)
3964	{
3965	struct sctp_association *asoc;
3966
3967	if (optlen != sizeof(*params))
3968	return -EINVAL;
3969
3970	asoc = sctp_id2assoc(sk, id: params->assoc_id);
3971	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3972	sctp_style(sk, UDP))
3973	return -EINVAL;
3974
3975	sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3976
3977	return 0;
3978	}
3979
3980	static int sctp_setsockopt_default_prinfo(struct sock *sk,
3981	struct sctp_default_prinfo *info,
3982	unsigned int optlen)
3983	{
3984	struct sctp_sock *sp = sctp_sk(sk);
3985	struct sctp_association *asoc;
3986	int retval = -EINVAL;
3987
3988	if (optlen != sizeof(*info))
3989	goto out;
3990
3991	if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3992	goto out;
3993
3994	if (info->pr_policy == SCTP_PR_SCTP_NONE)
3995	info->pr_value = 0;
3996
3997	asoc = sctp_id2assoc(sk, id: info->pr_assoc_id);
3998	if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3999	sctp_style(sk, UDP))
4000	goto out;
4001
4002	retval = 0;
4003
4004	if (asoc) {
4005	SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
4006	asoc->default_timetolive = info->pr_value;
4007	goto out;
4008	}
4009
4010	if (sctp_style(sk, TCP))
4011	info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4012
4013	if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4014	info->pr_assoc_id == SCTP_ALL_ASSOC) {
4015	SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4016	sp->default_timetolive = info->pr_value;
4017	}
4018
4019	if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4020	info->pr_assoc_id == SCTP_ALL_ASSOC) {
4021	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4022	SCTP_PR_SET_POLICY(asoc->default_flags,
4023	info->pr_policy);
4024	asoc->default_timetolive = info->pr_value;
4025	}
4026	}
4027
4028	out:
4029	return retval;
4030	}
4031
4032	static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4033	struct sctp_assoc_value *params,
4034	unsigned int optlen)
4035	{
4036	struct sctp_association *asoc;
4037	int retval = -EINVAL;
4038
4039	if (optlen != sizeof(*params))
4040	goto out;
4041
4042	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4043	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4044	sctp_style(sk, UDP))
4045	goto out;
4046
4047	sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4048
4049	retval = 0;
4050
4051	out:
4052	return retval;
4053	}
4054
4055	static int sctp_setsockopt_enable_strreset(struct sock *sk,
4056	struct sctp_assoc_value *params,
4057	unsigned int optlen)
4058	{
4059	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4060	struct sctp_association *asoc;
4061	int retval = -EINVAL;
4062
4063	if (optlen != sizeof(*params))
4064	goto out;
4065
4066	if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4067	goto out;
4068
4069	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4070	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4071	sctp_style(sk, UDP))
4072	goto out;
4073
4074	retval = 0;
4075
4076	if (asoc) {
4077	asoc->strreset_enable = params->assoc_value;
4078	goto out;
4079	}
4080
4081	if (sctp_style(sk, TCP))
4082	params->assoc_id = SCTP_FUTURE_ASSOC;
4083
4084	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4085	params->assoc_id == SCTP_ALL_ASSOC)
4086	ep->strreset_enable = params->assoc_value;
4087
4088	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4089	params->assoc_id == SCTP_ALL_ASSOC)
4090	list_for_each_entry(asoc, &ep->asocs, asocs)
4091	asoc->strreset_enable = params->assoc_value;
4092
4093	out:
4094	return retval;
4095	}
4096
4097	static int sctp_setsockopt_reset_streams(struct sock *sk,
4098	struct sctp_reset_streams *params,
4099	unsigned int optlen)
4100	{
4101	struct sctp_association *asoc;
4102
4103	if (optlen < sizeof(*params))
4104	return -EINVAL;
4105	/* srs_number_streams is u16, so optlen can't be bigger than this. */
4106	optlen = min_t(unsigned int, optlen, USHRT_MAX +
4107	sizeof(__u16) * sizeof(*params));
4108
4109	if (params->srs_number_streams * sizeof(__u16) >
4110	optlen - sizeof(*params))
4111	return -EINVAL;
4112
4113	asoc = sctp_id2assoc(sk, id: params->srs_assoc_id);
4114	if (!asoc)
4115	return -EINVAL;
4116
4117	return sctp_send_reset_streams(asoc, params);
4118	}
4119
4120	static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4121	unsigned int optlen)
4122	{
4123	struct sctp_association *asoc;
4124
4125	if (optlen != sizeof(*associd))
4126	return -EINVAL;
4127
4128	asoc = sctp_id2assoc(sk, id: *associd);
4129	if (!asoc)
4130	return -EINVAL;
4131
4132	return sctp_send_reset_assoc(asoc);
4133	}
4134
4135	static int sctp_setsockopt_add_streams(struct sock *sk,
4136	struct sctp_add_streams *params,
4137	unsigned int optlen)
4138	{
4139	struct sctp_association *asoc;
4140
4141	if (optlen != sizeof(*params))
4142	return -EINVAL;
4143
4144	asoc = sctp_id2assoc(sk, id: params->sas_assoc_id);
4145	if (!asoc)
4146	return -EINVAL;
4147
4148	return sctp_send_add_streams(asoc, params);
4149	}
4150
4151	static int sctp_setsockopt_scheduler(struct sock *sk,
4152	struct sctp_assoc_value *params,
4153	unsigned int optlen)
4154	{
4155	struct sctp_sock *sp = sctp_sk(sk);
4156	struct sctp_association *asoc;
4157	int retval = 0;
4158
4159	if (optlen < sizeof(*params))
4160	return -EINVAL;
4161
4162	if (params->assoc_value > SCTP_SS_MAX)
4163	return -EINVAL;
4164
4165	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4166	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4167	sctp_style(sk, UDP))
4168	return -EINVAL;
4169
4170	if (asoc)
4171	return sctp_sched_set_sched(asoc, sched: params->assoc_value);
4172
4173	if (sctp_style(sk, TCP))
4174	params->assoc_id = SCTP_FUTURE_ASSOC;
4175
4176	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4177	params->assoc_id == SCTP_ALL_ASSOC)
4178	sp->default_ss = params->assoc_value;
4179
4180	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4181	params->assoc_id == SCTP_ALL_ASSOC) {
4182	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4183	int ret = sctp_sched_set_sched(asoc,
4184	sched: params->assoc_value);
4185
4186	if (ret && !retval)
4187	retval = ret;
4188	}
4189	}
4190
4191	return retval;
4192	}
4193
4194	static int sctp_setsockopt_scheduler_value(struct sock *sk,
4195	struct sctp_stream_value *params,
4196	unsigned int optlen)
4197	{
4198	struct sctp_association *asoc;
4199	int retval = -EINVAL;
4200
4201	if (optlen < sizeof(*params))
4202	goto out;
4203
4204	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4205	if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4206	sctp_style(sk, UDP))
4207	goto out;
4208
4209	if (asoc) {
4210	retval = sctp_sched_set_value(asoc, sid: params->stream_id,
4211	value: params->stream_value, GFP_KERNEL);
4212	goto out;
4213	}
4214
4215	retval = 0;
4216
4217	list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4218	int ret = sctp_sched_set_value(asoc, sid: params->stream_id,
4219	value: params->stream_value,
4220	GFP_KERNEL);
4221	if (ret && !retval) /* try to return the 1st error. */
4222	retval = ret;
4223	}
4224
4225	out:
4226	return retval;
4227	}
4228
4229	static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4230	struct sctp_assoc_value *p,
4231	unsigned int optlen)
4232	{
4233	struct sctp_sock *sp = sctp_sk(sk);
4234	struct sctp_association *asoc;
4235
4236	if (optlen < sizeof(*p))
4237	return -EINVAL;
4238
4239	asoc = sctp_id2assoc(sk, id: p->assoc_id);
4240	if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4241	return -EINVAL;
4242
4243	if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4244	return -EPERM;
4245	}
4246
4247	sp->ep->intl_enable = !!p->assoc_value;
4248	return 0;
4249	}
4250
4251	static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4252	unsigned int optlen)
4253	{
4254	if (!sctp_style(sk, TCP))
4255	return -EOPNOTSUPP;
4256
4257	if (sctp_sk(sk)->ep->base.bind_addr.port)
4258	return -EFAULT;
4259
4260	if (optlen < sizeof(int))
4261	return -EINVAL;
4262
4263	sctp_sk(sk)->reuse = !!*val;
4264
4265	return 0;
4266	}
4267
4268	static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4269	struct sctp_association *asoc)
4270	{
4271	struct sctp_ulpevent *event;
4272
4273	sctp_ulpevent_type_set(subscribe: &asoc->subscribe, sn_type: param->se_type, on: param->se_on);
4274
4275	if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4276	if (sctp_outq_is_empty(&asoc->outqueue)) {
4277	event = sctp_ulpevent_make_sender_dry_event(asoc,
4278	GFP_USER | __GFP_NOWARN);
4279	if (!event)
4280	return -ENOMEM;
4281
4282	asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4283	}
4284	}
4285
4286	return 0;
4287	}
4288
4289	static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4290	unsigned int optlen)
4291	{
4292	struct sctp_sock *sp = sctp_sk(sk);
4293	struct sctp_association *asoc;
4294	int retval = 0;
4295
4296	if (optlen < sizeof(*param))
4297	return -EINVAL;
4298
4299	if (param->se_type < SCTP_SN_TYPE_BASE ||
4300	param->se_type > SCTP_SN_TYPE_MAX)
4301	return -EINVAL;
4302
4303	asoc = sctp_id2assoc(sk, id: param->se_assoc_id);
4304	if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4305	sctp_style(sk, UDP))
4306	return -EINVAL;
4307
4308	if (asoc)
4309	return sctp_assoc_ulpevent_type_set(param, asoc);
4310
4311	if (sctp_style(sk, TCP))
4312	param->se_assoc_id = SCTP_FUTURE_ASSOC;
4313
4314	if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4315	param->se_assoc_id == SCTP_ALL_ASSOC)
4316	sctp_ulpevent_type_set(subscribe: &sp->subscribe,
4317	sn_type: param->se_type, on: param->se_on);
4318
4319	if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4320	param->se_assoc_id == SCTP_ALL_ASSOC) {
4321	list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4322	int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4323
4324	if (ret && !retval)
4325	retval = ret;
4326	}
4327	}
4328
4329	return retval;
4330	}
4331
4332	static int sctp_setsockopt_asconf_supported(struct sock *sk,
4333	struct sctp_assoc_value *params,
4334	unsigned int optlen)
4335	{
4336	struct sctp_association *asoc;
4337	struct sctp_endpoint *ep;
4338	int retval = -EINVAL;
4339
4340	if (optlen != sizeof(*params))
4341	goto out;
4342
4343	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4344	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4345	sctp_style(sk, UDP))
4346	goto out;
4347
4348	ep = sctp_sk(sk)->ep;
4349	ep->asconf_enable = !!params->assoc_value;
4350
4351	if (ep->asconf_enable && ep->auth_enable) {
4352	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF);
4353	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF_ACK);
4354	}
4355
4356	retval = 0;
4357
4358	out:
4359	return retval;
4360	}
4361
4362	static int sctp_setsockopt_auth_supported(struct sock *sk,
4363	struct sctp_assoc_value *params,
4364	unsigned int optlen)
4365	{
4366	struct sctp_association *asoc;
4367	struct sctp_endpoint *ep;
4368	int retval = -EINVAL;
4369
4370	if (optlen != sizeof(*params))
4371	goto out;
4372
4373	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4374	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4375	sctp_style(sk, UDP))
4376	goto out;
4377
4378	ep = sctp_sk(sk)->ep;
4379	if (params->assoc_value) {
4380	retval = sctp_auth_init(ep, GFP_KERNEL);
4381	if (retval)
4382	goto out;
4383	if (ep->asconf_enable) {
4384	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF);
4385	sctp_auth_ep_add_chunkid(ep, chunk_id: SCTP_CID_ASCONF_ACK);
4386	}
4387	}
4388
4389	ep->auth_enable = !!params->assoc_value;
4390	retval = 0;
4391
4392	out:
4393	return retval;
4394	}
4395
4396	static int sctp_setsockopt_ecn_supported(struct sock *sk,
4397	struct sctp_assoc_value *params,
4398	unsigned int optlen)
4399	{
4400	struct sctp_association *asoc;
4401	int retval = -EINVAL;
4402
4403	if (optlen != sizeof(*params))
4404	goto out;
4405
4406	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4407	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4408	sctp_style(sk, UDP))
4409	goto out;
4410
4411	sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4412	retval = 0;
4413
4414	out:
4415	return retval;
4416	}
4417
4418	static int sctp_setsockopt_pf_expose(struct sock *sk,
4419	struct sctp_assoc_value *params,
4420	unsigned int optlen)
4421	{
4422	struct sctp_association *asoc;
4423	int retval = -EINVAL;
4424
4425	if (optlen != sizeof(*params))
4426	goto out;
4427
4428	if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4429	goto out;
4430
4431	asoc = sctp_id2assoc(sk, id: params->assoc_id);
4432	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4433	sctp_style(sk, UDP))
4434	goto out;
4435
4436	if (asoc)
4437	asoc->pf_expose = params->assoc_value;
4438	else
4439	sctp_sk(sk)->pf_expose = params->assoc_value;
4440	retval = 0;
4441
4442	out:
4443	return retval;
4444	}
4445
4446	static int sctp_setsockopt_encap_port(struct sock *sk,
4447	struct sctp_udpencaps *encap,
4448	unsigned int optlen)
4449	{
4450	struct sctp_association *asoc;
4451	struct sctp_transport *t;
4452	__be16 encap_port;
4453
4454	if (optlen != sizeof(*encap))
4455	return -EINVAL;
4456
4457	/* If an address other than INADDR_ANY is specified, and
4458	* no transport is found, then the request is invalid.
4459	*/
4460	encap_port = (__force __be16)encap->sue_port;
4461	if (!sctp_is_any(sk, addr: (union sctp_addr *)&encap->sue_address)) {
4462	t = sctp_addr_id2transport(sk, addr: &encap->sue_address,
4463	id: encap->sue_assoc_id);
4464	if (!t)
4465	return -EINVAL;
4466
4467	t->encap_port = encap_port;
4468	return 0;
4469	}
4470
4471	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4472	* socket is a one to many style socket, and an association
4473	* was not found, then the id was invalid.
4474	*/
4475	asoc = sctp_id2assoc(sk, id: encap->sue_assoc_id);
4476	if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4477	sctp_style(sk, UDP))
4478	return -EINVAL;
4479
4480	/* If changes are for association, also apply encap_port to
4481	* each transport.
4482	*/
4483	if (asoc) {
4484	list_for_each_entry(t, &asoc->peer.transport_addr_list,
4485	transports)
4486	t->encap_port = encap_port;
4487
4488	asoc->encap_port = encap_port;
4489	return 0;
4490	}
4491
4492	sctp_sk(sk)->encap_port = encap_port;
4493	return 0;
4494	}
4495
4496	static int sctp_setsockopt_probe_interval(struct sock *sk,
4497	struct sctp_probeinterval *params,
4498	unsigned int optlen)
4499	{
4500	struct sctp_association *asoc;
4501	struct sctp_transport *t;
4502	__u32 probe_interval;
4503
4504	if (optlen != sizeof(*params))
4505	return -EINVAL;
4506
4507	probe_interval = params->spi_interval;
4508	if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4509	return -EINVAL;
4510
4511	/* If an address other than INADDR_ANY is specified, and
4512	* no transport is found, then the request is invalid.
4513	*/
4514	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params->spi_address)) {
4515	t = sctp_addr_id2transport(sk, addr: &params->spi_address,
4516	id: params->spi_assoc_id);
4517	if (!t)
4518	return -EINVAL;
4519
4520	t->probe_interval = msecs_to_jiffies(m: probe_interval);
4521	sctp_transport_pl_reset(t);
4522	return 0;
4523	}
4524
4525	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4526	* socket is a one to many style socket, and an association
4527	* was not found, then the id was invalid.
4528	*/
4529	asoc = sctp_id2assoc(sk, id: params->spi_assoc_id);
4530	if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4531	sctp_style(sk, UDP))
4532	return -EINVAL;
4533
4534	/* If changes are for association, also apply probe_interval to
4535	* each transport.
4536	*/
4537	if (asoc) {
4538	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4539	t->probe_interval = msecs_to_jiffies(m: probe_interval);
4540	sctp_transport_pl_reset(t);
4541	}
4542
4543	asoc->probe_interval = msecs_to_jiffies(m: probe_interval);
4544	return 0;
4545	}
4546
4547	sctp_sk(sk)->probe_interval = probe_interval;
4548	return 0;
4549	}
4550
4551	/* API 6.2 setsockopt(), getsockopt()
4552	*
4553	* Applications use setsockopt() and getsockopt() to set or retrieve
4554	* socket options. Socket options are used to change the default
4555	* behavior of sockets calls. They are described in Section 7.
4556	*
4557	* The syntax is:
4558	*
4559	* ret = getsockopt(int sd, int level, int optname, void __user *optval,
4560	* int __user *optlen);
4561	* ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4562	* int optlen);
4563	*
4564	* sd - the socket descript.
4565	* level - set to IPPROTO_SCTP for all SCTP options.
4566	* optname - the option name.
4567	* optval - the buffer to store the value of the option.
4568	* optlen - the size of the buffer.
4569	*/
4570	static int sctp_setsockopt(struct sock *sk, int level, int optname,
4571	sockptr_t optval, unsigned int optlen)
4572	{
4573	void *kopt = NULL;
4574	int retval = 0;
4575
4576	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4577
4578	/* I can hardly begin to describe how wrong this is. This is
4579	* so broken as to be worse than useless. The API draft
4580	* REALLY is NOT helpful here... I am not convinced that the
4581	* semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4582	* are at all well-founded.
4583	*/
4584	if (level != SOL_SCTP) {
4585	struct sctp_af *af = sctp_sk(sk)->pf->af;
4586
4587	return af->setsockopt(sk, level, optname, optval, optlen);
4588	}
4589
4590	if (optlen > 0) {
4591	/* Trim it to the biggest size sctp sockopt may need if necessary */
4592	optlen = min_t(unsigned int, optlen,
4593	PAGE_ALIGN(USHRT_MAX +
4594	sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4595	kopt = memdup_sockptr(src: optval, len: optlen);
4596	if (IS_ERR(ptr: kopt))
4597	return PTR_ERR(ptr: kopt);
4598	}
4599
4600	lock_sock(sk);
4601
4602	switch (optname) {
4603	case SCTP_SOCKOPT_BINDX_ADD:
4604	/* 'optlen' is the size of the addresses buffer. */
4605	retval = sctp_setsockopt_bindx(sk, addrs: kopt, addrs_size: optlen,
4606	SCTP_BINDX_ADD_ADDR);
4607	break;
4608
4609	case SCTP_SOCKOPT_BINDX_REM:
4610	/* 'optlen' is the size of the addresses buffer. */
4611	retval = sctp_setsockopt_bindx(sk, addrs: kopt, addrs_size: optlen,
4612	SCTP_BINDX_REM_ADDR);
4613	break;
4614
4615	case SCTP_SOCKOPT_CONNECTX_OLD:
4616	/* 'optlen' is the size of the addresses buffer. */
4617	retval = sctp_setsockopt_connectx_old(sk, kaddrs: kopt, addrs_size: optlen);
4618	break;
4619
4620	case SCTP_SOCKOPT_CONNECTX:
4621	/* 'optlen' is the size of the addresses buffer. */
4622	retval = sctp_setsockopt_connectx(sk, kaddrs: kopt, addrs_size: optlen);
4623	break;
4624
4625	case SCTP_DISABLE_FRAGMENTS:
4626	retval = sctp_setsockopt_disable_fragments(sk, val: kopt, optlen);
4627	break;
4628
4629	case SCTP_EVENTS:
4630	retval = sctp_setsockopt_events(sk, sn_type: kopt, optlen);
4631	break;
4632
4633	case SCTP_AUTOCLOSE:
4634	retval = sctp_setsockopt_autoclose(sk, optval: kopt, optlen);
4635	break;
4636
4637	case SCTP_PEER_ADDR_PARAMS:
4638	retval = sctp_setsockopt_peer_addr_params(sk, params: kopt, optlen);
4639	break;
4640
4641	case SCTP_DELAYED_SACK:
4642	retval = sctp_setsockopt_delayed_ack(sk, params: kopt, optlen);
4643	break;
4644	case SCTP_PARTIAL_DELIVERY_POINT:
4645	retval = sctp_setsockopt_partial_delivery_point(sk, val: kopt, optlen);
4646	break;
4647
4648	case SCTP_INITMSG:
4649	retval = sctp_setsockopt_initmsg(sk, sinit: kopt, optlen);
4650	break;
4651	case SCTP_DEFAULT_SEND_PARAM:
4652	retval = sctp_setsockopt_default_send_param(sk, info: kopt, optlen);
4653	break;
4654	case SCTP_DEFAULT_SNDINFO:
4655	retval = sctp_setsockopt_default_sndinfo(sk, info: kopt, optlen);
4656	break;
4657	case SCTP_PRIMARY_ADDR:
4658	retval = sctp_setsockopt_primary_addr(sk, prim: kopt, optlen);
4659	break;
4660	case SCTP_SET_PEER_PRIMARY_ADDR:
4661	retval = sctp_setsockopt_peer_primary_addr(sk, prim: kopt, optlen);
4662	break;
4663	case SCTP_NODELAY:
4664	retval = sctp_setsockopt_nodelay(sk, val: kopt, optlen);
4665	break;
4666	case SCTP_RTOINFO:
4667	retval = sctp_setsockopt_rtoinfo(sk, rtoinfo: kopt, optlen);
4668	break;
4669	case SCTP_ASSOCINFO:
4670	retval = sctp_setsockopt_associnfo(sk, assocparams: kopt, optlen);
4671	break;
4672	case SCTP_I_WANT_MAPPED_V4_ADDR:
4673	retval = sctp_setsockopt_mappedv4(sk, val: kopt, optlen);
4674	break;
4675	case SCTP_MAXSEG:
4676	retval = sctp_setsockopt_maxseg(sk, params: kopt, optlen);
4677	break;
4678	case SCTP_ADAPTATION_LAYER:
4679	retval = sctp_setsockopt_adaptation_layer(sk, adapt: kopt, optlen);
4680	break;
4681	case SCTP_CONTEXT:
4682	retval = sctp_setsockopt_context(sk, params: kopt, optlen);
4683	break;
4684	case SCTP_FRAGMENT_INTERLEAVE:
4685	retval = sctp_setsockopt_fragment_interleave(sk, val: kopt, optlen);
4686	break;
4687	case SCTP_MAX_BURST:
4688	retval = sctp_setsockopt_maxburst(sk, params: kopt, optlen);
4689	break;
4690	case SCTP_AUTH_CHUNK:
4691	retval = sctp_setsockopt_auth_chunk(sk, val: kopt, optlen);
4692	break;
4693	case SCTP_HMAC_IDENT:
4694	retval = sctp_setsockopt_hmac_ident(sk, hmacs: kopt, optlen);
4695	break;
4696	case SCTP_AUTH_KEY:
4697	retval = sctp_setsockopt_auth_key(sk, authkey: kopt, optlen);
4698	break;
4699	case SCTP_AUTH_ACTIVE_KEY:
4700	retval = sctp_setsockopt_active_key(sk, val: kopt, optlen);
4701	break;
4702	case SCTP_AUTH_DELETE_KEY:
4703	retval = sctp_setsockopt_del_key(sk, val: kopt, optlen);
4704	break;
4705	case SCTP_AUTH_DEACTIVATE_KEY:
4706	retval = sctp_setsockopt_deactivate_key(sk, val: kopt, optlen);
4707	break;
4708	case SCTP_AUTO_ASCONF:
4709	retval = sctp_setsockopt_auto_asconf(sk, val: kopt, optlen);
4710	break;
4711	case SCTP_PEER_ADDR_THLDS:
4712	retval = sctp_setsockopt_paddr_thresholds(sk, val: kopt, optlen,
4713	v2: false);
4714	break;
4715	case SCTP_PEER_ADDR_THLDS_V2:
4716	retval = sctp_setsockopt_paddr_thresholds(sk, val: kopt, optlen,
4717	v2: true);
4718	break;
4719	case SCTP_RECVRCVINFO:
4720	retval = sctp_setsockopt_recvrcvinfo(sk, val: kopt, optlen);
4721	break;
4722	case SCTP_RECVNXTINFO:
4723	retval = sctp_setsockopt_recvnxtinfo(sk, val: kopt, optlen);
4724	break;
4725	case SCTP_PR_SUPPORTED:
4726	retval = sctp_setsockopt_pr_supported(sk, params: kopt, optlen);
4727	break;
4728	case SCTP_DEFAULT_PRINFO:
4729	retval = sctp_setsockopt_default_prinfo(sk, info: kopt, optlen);
4730	break;
4731	case SCTP_RECONFIG_SUPPORTED:
4732	retval = sctp_setsockopt_reconfig_supported(sk, params: kopt, optlen);
4733	break;
4734	case SCTP_ENABLE_STREAM_RESET:
4735	retval = sctp_setsockopt_enable_strreset(sk, params: kopt, optlen);
4736	break;
4737	case SCTP_RESET_STREAMS:
4738	retval = sctp_setsockopt_reset_streams(sk, params: kopt, optlen);
4739	break;
4740	case SCTP_RESET_ASSOC:
4741	retval = sctp_setsockopt_reset_assoc(sk, associd: kopt, optlen);
4742	break;
4743	case SCTP_ADD_STREAMS:
4744	retval = sctp_setsockopt_add_streams(sk, params: kopt, optlen);
4745	break;
4746	case SCTP_STREAM_SCHEDULER:
4747	retval = sctp_setsockopt_scheduler(sk, params: kopt, optlen);
4748	break;
4749	case SCTP_STREAM_SCHEDULER_VALUE:
4750	retval = sctp_setsockopt_scheduler_value(sk, params: kopt, optlen);
4751	break;
4752	case SCTP_INTERLEAVING_SUPPORTED:
4753	retval = sctp_setsockopt_interleaving_supported(sk, p: kopt,
4754	optlen);
4755	break;
4756	case SCTP_REUSE_PORT:
4757	retval = sctp_setsockopt_reuse_port(sk, val: kopt, optlen);
4758	break;
4759	case SCTP_EVENT:
4760	retval = sctp_setsockopt_event(sk, param: kopt, optlen);
4761	break;
4762	case SCTP_ASCONF_SUPPORTED:
4763	retval = sctp_setsockopt_asconf_supported(sk, params: kopt, optlen);
4764	break;
4765	case SCTP_AUTH_SUPPORTED:
4766	retval = sctp_setsockopt_auth_supported(sk, params: kopt, optlen);
4767	break;
4768	case SCTP_ECN_SUPPORTED:
4769	retval = sctp_setsockopt_ecn_supported(sk, params: kopt, optlen);
4770	break;
4771	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4772	retval = sctp_setsockopt_pf_expose(sk, params: kopt, optlen);
4773	break;
4774	case SCTP_REMOTE_UDP_ENCAPS_PORT:
4775	retval = sctp_setsockopt_encap_port(sk, encap: kopt, optlen);
4776	break;
4777	case SCTP_PLPMTUD_PROBE_INTERVAL:
4778	retval = sctp_setsockopt_probe_interval(sk, params: kopt, optlen);
4779	break;
4780	default:
4781	retval = -ENOPROTOOPT;
4782	break;
4783	}
4784
4785	release_sock(sk);
4786	kfree(objp: kopt);
4787	return retval;
4788	}
4789
4790	/* API 3.1.6 connect() - UDP Style Syntax
4791	*
4792	* An application may use the connect() call in the UDP model to initiate an
4793	* association without sending data.
4794	*
4795	* The syntax is:
4796	*
4797	* ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4798	*
4799	* sd: the socket descriptor to have a new association added to.
4800	*
4801	* nam: the address structure (either struct sockaddr_in or struct
4802	* sockaddr_in6 defined in RFC2553 [7]).
4803	*
4804	* len: the size of the address.
4805	*/
4806	static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4807	int addr_len, int flags)
4808	{
4809	struct sctp_af *af;
4810	int err = -EINVAL;
4811
4812	lock_sock(sk);
4813	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4814	addr, addr_len);
4815
4816	/* Validate addr_len before calling common connect/connectx routine. */
4817	af = sctp_get_af_specific(addr->sa_family);
4818	if (af && addr_len >= af->sockaddr_len)
4819	err = __sctp_connect(sk, kaddrs: addr, addrs_size: af->sockaddr_len, flags, NULL);
4820
4821	release_sock(sk);
4822	return err;
4823	}
4824
4825	int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4826	int addr_len, int flags)
4827	{
4828	if (addr_len < sizeof(uaddr->sa_family))
4829	return -EINVAL;
4830
4831	if (uaddr->sa_family == AF_UNSPEC)
4832	return -EOPNOTSUPP;
4833
4834	return sctp_connect(sk: sock->sk, addr: uaddr, addr_len, flags);
4835	}
4836
4837	/* FIXME: Write comments. */
4838	static int sctp_disconnect(struct sock *sk, int flags)
4839	{
4840	return -EOPNOTSUPP; /* STUB */
4841	}
4842
4843	/* 4.1.4 accept() - TCP Style Syntax
4844	*
4845	* Applications use accept() call to remove an established SCTP
4846	* association from the accept queue of the endpoint. A new socket
4847	* descriptor will be returned from accept() to represent the newly
4848	* formed association.
4849	*/
4850	static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4851	{
4852	struct sctp_sock *sp;
4853	struct sctp_endpoint *ep;
4854	struct sock *newsk = NULL;
4855	struct sctp_association *asoc;
4856	long timeo;
4857	int error = 0;
4858
4859	lock_sock(sk);
4860
4861	sp = sctp_sk(sk);
4862	ep = sp->ep;
4863
4864	if (!sctp_style(sk, TCP)) {
4865	error = -EOPNOTSUPP;
4866	goto out;
4867	}
4868
4869	if (!sctp_sstate(sk, LISTENING)) {
4870	error = -EINVAL;
4871	goto out;
4872	}
4873
4874	timeo = sock_rcvtimeo(sk, noblock: flags & O_NONBLOCK);
4875
4876	error = sctp_wait_for_accept(sk, timeo);
4877	if (error)
4878	goto out;
4879
4880	/* We treat the list of associations on the endpoint as the accept
4881	* queue and pick the first association on the list.
4882	*/
4883	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4884
4885	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4886	if (!newsk) {
4887	error = -ENOMEM;
4888	goto out;
4889	}
4890
4891	/* Populate the fields of the newsk from the oldsk and migrate the
4892	* asoc to the newsk.
4893	*/
4894	error = sctp_sock_migrate(oldsk: sk, newsk, assoc: asoc, type: SCTP_SOCKET_TCP);
4895	if (error) {
4896	sk_common_release(sk: newsk);
4897	newsk = NULL;
4898	}
4899
4900	out:
4901	release_sock(sk);
4902	*err = error;
4903	return newsk;
4904	}
4905
4906	/* The SCTP ioctl handler. */
4907	static int sctp_ioctl(struct sock *sk, int cmd, int *karg)
4908	{
4909	int rc = -ENOTCONN;
4910
4911	lock_sock(sk);
4912
4913	/*
4914	* SEQPACKET-style sockets in LISTENING state are valid, for
4915	* SCTP, so only discard TCP-style sockets in LISTENING state.
4916	*/
4917	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4918	goto out;
4919
4920	switch (cmd) {
4921	case SIOCINQ: {
4922	struct sk_buff *skb;
4923	*karg = 0;
4924
4925	skb = skb_peek(list_: &sk->sk_receive_queue);
4926	if (skb != NULL) {
4927	/*
4928	* We will only return the amount of this packet since
4929	* that is all that will be read.
4930	*/
4931	*karg = skb->len;
4932	}
4933	rc = 0;
4934	break;
4935	}
4936	default:
4937	rc = -ENOIOCTLCMD;
4938	break;
4939	}
4940	out:
4941	release_sock(sk);
4942	return rc;
4943	}
4944
4945	/* This is the function which gets called during socket creation to
4946	* initialized the SCTP-specific portion of the sock.
4947	* The sock structure should already be zero-filled memory.
4948	*/
4949	static int sctp_init_sock(struct sock *sk)
4950	{
4951	struct net *net = sock_net(sk);
4952	struct sctp_sock *sp;
4953
4954	pr_debug("%s: sk:%p\n", __func__, sk);
4955
4956	sp = sctp_sk(sk);
4957
4958	/* Initialize the SCTP per socket area. */
4959	switch (sk->sk_type) {
4960	case SOCK_SEQPACKET:
4961	sp->type = SCTP_SOCKET_UDP;
4962	break;
4963	case SOCK_STREAM:
4964	sp->type = SCTP_SOCKET_TCP;
4965	break;
4966	default:
4967	return -ESOCKTNOSUPPORT;
4968	}
4969
4970	sk->sk_gso_type = SKB_GSO_SCTP;
4971
4972	/* Initialize default send parameters. These parameters can be
4973	* modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4974	*/
4975	sp->default_stream = 0;
4976	sp->default_ppid = 0;
4977	sp->default_flags = 0;
4978	sp->default_context = 0;
4979	sp->default_timetolive = 0;
4980
4981	sp->default_rcv_context = 0;
4982	sp->max_burst = net->sctp.max_burst;
4983
4984	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4985
4986	/* Initialize default setup parameters. These parameters
4987	* can be modified with the SCTP_INITMSG socket option or
4988	* overridden by the SCTP_INIT CMSG.
4989	*/
4990	sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4991	sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4992	sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4993	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4994
4995	/* Initialize default RTO related parameters. These parameters can
4996	* be modified for with the SCTP_RTOINFO socket option.
4997	*/
4998	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4999	sp->rtoinfo.srto_max = net->sctp.rto_max;
5000	sp->rtoinfo.srto_min = net->sctp.rto_min;
5001
5002	/* Initialize default association related parameters. These parameters
5003	* can be modified with the SCTP_ASSOCINFO socket option.
5004	*/
5005	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5006	sp->assocparams.sasoc_number_peer_destinations = 0;
5007	sp->assocparams.sasoc_peer_rwnd = 0;
5008	sp->assocparams.sasoc_local_rwnd = 0;
5009	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5010
5011	/* Initialize default event subscriptions. By default, all the
5012	* options are off.
5013	*/
5014	sp->subscribe = 0;
5015
5016	/* Default Peer Address Parameters. These defaults can
5017	* be modified via SCTP_PEER_ADDR_PARAMS
5018	*/
5019	sp->hbinterval = net->sctp.hb_interval;
5020	sp->udp_port = htons(net->sctp.udp_port);
5021	sp->encap_port = htons(net->sctp.encap_port);
5022	sp->pathmaxrxt = net->sctp.max_retrans_path;
5023	sp->pf_retrans = net->sctp.pf_retrans;
5024	sp->ps_retrans = net->sctp.ps_retrans;
5025	sp->pf_expose = net->sctp.pf_expose;
5026	sp->pathmtu = 0; /* allow default discovery */
5027	sp->sackdelay = net->sctp.sack_timeout;
5028	sp->sackfreq = 2;
5029	sp->param_flags = SPP_HB_ENABLE |
5030	SPP_PMTUD_ENABLE |
5031	SPP_SACKDELAY_ENABLE;
5032	sp->default_ss = SCTP_SS_DEFAULT;
5033
5034	/* If enabled no SCTP message fragmentation will be performed.
5035	* Configure through SCTP_DISABLE_FRAGMENTS socket option.
5036	*/
5037	sp->disable_fragments = 0;
5038
5039	/* Enable Nagle algorithm by default. */
5040	sp->nodelay = 0;
5041
5042	sp->recvrcvinfo = 0;
5043	sp->recvnxtinfo = 0;
5044
5045	/* Enable by default. */
5046	sp->v4mapped = 1;
5047
5048	/* Auto-close idle associations after the configured
5049	* number of seconds. A value of 0 disables this
5050	* feature. Configure through the SCTP_AUTOCLOSE socket option,
5051	* for UDP-style sockets only.
5052	*/
5053	sp->autoclose = 0;
5054
5055	/* User specified fragmentation limit. */
5056	sp->user_frag = 0;
5057
5058	sp->adaptation_ind = 0;
5059
5060	sp->pf = sctp_get_pf_specific(family: sk->sk_family);
5061
5062	/* Control variables for partial data delivery. */
5063	atomic_set(v: &sp->pd_mode, i: 0);
5064	skb_queue_head_init(list: &sp->pd_lobby);
5065	sp->frag_interleave = 0;
5066	sp->probe_interval = net->sctp.probe_interval;
5067
5068	/* Create a per socket endpoint structure. Even if we
5069	* change the data structure relationships, this may still
5070	* be useful for storing pre-connect address information.
5071	*/
5072	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5073	if (!sp->ep)
5074	return -ENOMEM;
5075
5076	sp->hmac = NULL;
5077
5078	sk->sk_destruct = sctp_destruct_sock;
5079
5080	SCTP_DBG_OBJCNT_INC(sock);
5081
5082	sk_sockets_allocated_inc(sk);
5083	sock_prot_inuse_add(net, prot: sk->sk_prot, val: 1);
5084
5085	return 0;
5086	}
5087
5088	/* Cleanup any SCTP per socket resources. Must be called with
5089	* sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5090	*/
5091	static void sctp_destroy_sock(struct sock *sk)
5092	{
5093	struct sctp_sock *sp;
5094
5095	pr_debug("%s: sk:%p\n", __func__, sk);
5096
5097	/* Release our hold on the endpoint. */
5098	sp = sctp_sk(sk);
5099	/* This could happen during socket init, thus we bail out
5100	* early, since the rest of the below is not setup either.
5101	*/
5102	if (sp->ep == NULL)
5103	return;
5104
5105	if (sp->do_auto_asconf) {
5106	sp->do_auto_asconf = 0;
5107	list_del(entry: &sp->auto_asconf_list);
5108	}
5109	sctp_endpoint_free(sp->ep);
5110	sk_sockets_allocated_dec(sk);
5111	sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: -1);
5112	}
5113
5114	/* Triggered when there are no references on the socket anymore */
5115	static void sctp_destruct_common(struct sock *sk)
5116	{
5117	struct sctp_sock *sp = sctp_sk(sk);
5118
5119	/* Free up the HMAC transform. */
5120	crypto_free_shash(tfm: sp->hmac);
5121	}
5122
5123	static void sctp_destruct_sock(struct sock *sk)
5124	{
5125	sctp_destruct_common(sk);
5126	inet_sock_destruct(sk);
5127	}
5128
5129	/* API 4.1.7 shutdown() - TCP Style Syntax
5130	* int shutdown(int socket, int how);
5131	*
5132	* sd - the socket descriptor of the association to be closed.
5133	* how - Specifies the type of shutdown. The values are
5134	* as follows:
5135	* SHUT_RD
5136	* Disables further receive operations. No SCTP
5137	* protocol action is taken.
5138	* SHUT_WR
5139	* Disables further send operations, and initiates
5140	* the SCTP shutdown sequence.
5141	* SHUT_RDWR
5142	* Disables further send and receive operations
5143	* and initiates the SCTP shutdown sequence.
5144	*/
5145	static void sctp_shutdown(struct sock *sk, int how)
5146	{
5147	struct net *net = sock_net(sk);
5148	struct sctp_endpoint *ep;
5149
5150	if (!sctp_style(sk, TCP))
5151	return;
5152
5153	ep = sctp_sk(sk)->ep;
5154	if (how & SEND_SHUTDOWN && !list_empty(head: &ep->asocs)) {
5155	struct sctp_association *asoc;
5156
5157	inet_sk_set_state(sk, state: SCTP_SS_CLOSING);
5158	asoc = list_entry(ep->asocs.next,
5159	struct sctp_association, asocs);
5160	sctp_primitive_SHUTDOWN(net, asoc, NULL);
5161	}
5162	}
5163
5164	int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5165	struct sctp_info *info)
5166	{
5167	struct sctp_transport *prim;
5168	struct list_head *pos;
5169	int mask;
5170
5171	memset(info, 0, sizeof(*info));
5172	if (!asoc) {
5173	struct sctp_sock *sp = sctp_sk(sk);
5174
5175	info->sctpi_s_autoclose = sp->autoclose;
5176	info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5177	info->sctpi_s_pd_point = sp->pd_point;
5178	info->sctpi_s_nodelay = sp->nodelay;
5179	info->sctpi_s_disable_fragments = sp->disable_fragments;
5180	info->sctpi_s_v4mapped = sp->v4mapped;
5181	info->sctpi_s_frag_interleave = sp->frag_interleave;
5182	info->sctpi_s_type = sp->type;
5183
5184	return 0;
5185	}
5186
5187	info->sctpi_tag = asoc->c.my_vtag;
5188	info->sctpi_state = asoc->state;
5189	info->sctpi_rwnd = asoc->a_rwnd;
5190	info->sctpi_unackdata = asoc->unack_data;
5191	info->sctpi_penddata = sctp_tsnmap_pending(map: &asoc->peer.tsn_map);
5192	info->sctpi_instrms = asoc->stream.incnt;
5193	info->sctpi_outstrms = asoc->stream.outcnt;
5194	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5195	info->sctpi_inqueue++;
5196	list_for_each(pos, &asoc->outqueue.out_chunk_list)
5197	info->sctpi_outqueue++;
5198	info->sctpi_overall_error = asoc->overall_error_count;
5199	info->sctpi_max_burst = asoc->max_burst;
5200	info->sctpi_maxseg = asoc->frag_point;
5201	info->sctpi_peer_rwnd = asoc->peer.rwnd;
5202	info->sctpi_peer_tag = asoc->c.peer_vtag;
5203
5204	mask = asoc->peer.intl_capable << 1;
5205	mask = (mask | asoc->peer.ecn_capable) << 1;
5206	mask = (mask | asoc->peer.ipv4_address) << 1;
5207	mask = (mask | asoc->peer.ipv6_address) << 1;
5208	mask = (mask | asoc->peer.reconf_capable) << 1;
5209	mask = (mask | asoc->peer.asconf_capable) << 1;
5210	mask = (mask | asoc->peer.prsctp_capable) << 1;
5211	mask = (mask | asoc->peer.auth_capable);
5212	info->sctpi_peer_capable = mask;
5213	mask = asoc->peer.sack_needed << 1;
5214	mask = (mask | asoc->peer.sack_generation) << 1;
5215	mask = (mask | asoc->peer.zero_window_announced);
5216	info->sctpi_peer_sack = mask;
5217
5218	info->sctpi_isacks = asoc->stats.isacks;
5219	info->sctpi_osacks = asoc->stats.osacks;
5220	info->sctpi_opackets = asoc->stats.opackets;
5221	info->sctpi_ipackets = asoc->stats.ipackets;
5222	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5223	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5224	info->sctpi_idupchunks = asoc->stats.idupchunks;
5225	info->sctpi_gapcnt = asoc->stats.gapcnt;
5226	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5227	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5228	info->sctpi_oodchunks = asoc->stats.oodchunks;
5229	info->sctpi_iodchunks = asoc->stats.iodchunks;
5230	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5231	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5232
5233	prim = asoc->peer.primary_path;
5234	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5235	info->sctpi_p_state = prim->state;
5236	info->sctpi_p_cwnd = prim->cwnd;
5237	info->sctpi_p_srtt = prim->srtt;
5238	info->sctpi_p_rto = jiffies_to_msecs(j: prim->rto);
5239	info->sctpi_p_hbinterval = prim->hbinterval;
5240	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5241	info->sctpi_p_sackdelay = jiffies_to_msecs(j: prim->sackdelay);
5242	info->sctpi_p_ssthresh = prim->ssthresh;
5243	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5244	info->sctpi_p_flight_size = prim->flight_size;
5245	info->sctpi_p_error = prim->error_count;
5246
5247	return 0;
5248	}
5249	EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5250
5251	/* use callback to avoid exporting the core structure */
5252	void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5253	{
5254	rhltable_walk_enter(hlt: &sctp_transport_hashtable, iter);
5255
5256	rhashtable_walk_start(iter);
5257	}
5258
5259	void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5260	{
5261	rhashtable_walk_stop(iter);
5262	rhashtable_walk_exit(iter);
5263	}
5264
5265	struct sctp_transport *sctp_transport_get_next(struct net *net,
5266	struct rhashtable_iter *iter)
5267	{
5268	struct sctp_transport *t;
5269
5270	t = rhashtable_walk_next(iter);
5271	for (; t; t = rhashtable_walk_next(iter)) {
5272	if (IS_ERR(ptr: t)) {
5273	if (PTR_ERR(ptr: t) == -EAGAIN)
5274	continue;
5275	break;
5276	}
5277
5278	if (!sctp_transport_hold(t))
5279	continue;
5280
5281	if (net_eq(net1: t->asoc->base.net, net2: net) &&
5282	t->asoc->peer.primary_path == t)
5283	break;
5284
5285	sctp_transport_put(t);
5286	}
5287
5288	return t;
5289	}
5290
5291	struct sctp_transport *sctp_transport_get_idx(struct net *net,
5292	struct rhashtable_iter *iter,
5293	int pos)
5294	{
5295	struct sctp_transport *t;
5296
5297	if (!pos)
5298	return SEQ_START_TOKEN;
5299
5300	while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(ptr: t)) {
5301	if (!--pos)
5302	break;
5303	sctp_transport_put(t);
5304	}
5305
5306	return t;
5307	}
5308
5309	int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5310	void *p) {
5311	int err = 0;
5312	int hash = 0;
5313	struct sctp_endpoint *ep;
5314	struct sctp_hashbucket *head;
5315
5316	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5317	hash++, head++) {
5318	read_lock_bh(&head->lock);
5319	sctp_for_each_hentry(ep, &head->chain) {
5320	err = cb(ep, p);
5321	if (err)
5322	break;
5323	}
5324	read_unlock_bh(&head->lock);
5325	}
5326
5327	return err;
5328	}
5329	EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5330
5331	int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5332	const union sctp_addr *laddr,
5333	const union sctp_addr *paddr, void *p, int dif)
5334	{
5335	struct sctp_transport *transport;
5336	struct sctp_endpoint *ep;
5337	int err = -ENOENT;
5338
5339	rcu_read_lock();
5340	transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, sdif: dif);
5341	if (!transport) {
5342	rcu_read_unlock();
5343	return err;
5344	}
5345	ep = transport->asoc->ep;
5346	if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5347	sctp_transport_put(transport);
5348	rcu_read_unlock();
5349	return err;
5350	}
5351	rcu_read_unlock();
5352
5353	err = cb(ep, transport, p);
5354	sctp_endpoint_put(ep);
5355	sctp_transport_put(transport);
5356	return err;
5357	}
5358	EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5359
5360	int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5361	struct net *net, int *pos, void *p)
5362	{
5363	struct rhashtable_iter hti;
5364	struct sctp_transport *tsp;
5365	struct sctp_endpoint *ep;
5366	int ret;
5367
5368	again:
5369	ret = 0;
5370	sctp_transport_walk_start(iter: &hti);
5371
5372	tsp = sctp_transport_get_idx(net, iter: &hti, pos: *pos + 1);
5373	for (; !IS_ERR_OR_NULL(ptr: tsp); tsp = sctp_transport_get_next(net, iter: &hti)) {
5374	ep = tsp->asoc->ep;
5375	if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5376	ret = cb(ep, tsp, p);
5377	if (ret)
5378	break;
5379	sctp_endpoint_put(ep);
5380	}
5381	(*pos)++;
5382	sctp_transport_put(tsp);
5383	}
5384	sctp_transport_walk_stop(iter: &hti);
5385
5386	if (ret) {
5387	if (cb_done && !cb_done(ep, tsp, p)) {
5388	(*pos)++;
5389	sctp_endpoint_put(ep);
5390	sctp_transport_put(tsp);
5391	goto again;
5392	}
5393	sctp_endpoint_put(ep);
5394	sctp_transport_put(tsp);
5395	}
5396
5397	return ret;
5398	}
5399	EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5400
5401	/* 7.2.1 Association Status (SCTP_STATUS)
5402
5403	* Applications can retrieve current status information about an
5404	* association, including association state, peer receiver window size,
5405	* number of unacked data chunks, and number of data chunks pending
5406	* receipt. This information is read-only.
5407	*/
5408	static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5409	char __user *optval,
5410	int __user *optlen)
5411	{
5412	struct sctp_status status;
5413	struct sctp_association *asoc = NULL;
5414	struct sctp_transport *transport;
5415	sctp_assoc_t associd;
5416	int retval = 0;
5417
5418	if (len < sizeof(status)) {
5419	retval = -EINVAL;
5420	goto out;
5421	}
5422
5423	len = sizeof(status);
5424	if (copy_from_user(to: &status, from: optval, n: len)) {
5425	retval = -EFAULT;
5426	goto out;
5427	}
5428
5429	associd = status.sstat_assoc_id;
5430	asoc = sctp_id2assoc(sk, id: associd);
5431	if (!asoc) {
5432	retval = -EINVAL;
5433	goto out;
5434	}
5435
5436	transport = asoc->peer.primary_path;
5437
5438	status.sstat_assoc_id = sctp_assoc2id(asoc);
5439	status.sstat_state = sctp_assoc_to_state(asoc);
5440	status.sstat_rwnd = asoc->peer.rwnd;
5441	status.sstat_unackdata = asoc->unack_data;
5442
5443	status.sstat_penddata = sctp_tsnmap_pending(map: &asoc->peer.tsn_map);
5444	status.sstat_instrms = asoc->stream.incnt;
5445	status.sstat_outstrms = asoc->stream.outcnt;
5446	status.sstat_fragmentation_point = asoc->frag_point;
5447	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(asoc: transport->asoc);
5448	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5449	transport->af_specific->sockaddr_len);
5450	/* Map ipv4 address into v4-mapped-on-v6 address. */
5451	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sctp_sk(sk),
5452	(union sctp_addr *)&status.sstat_primary.spinfo_address);
5453	status.sstat_primary.spinfo_state = transport->state;
5454	status.sstat_primary.spinfo_cwnd = transport->cwnd;
5455	status.sstat_primary.spinfo_srtt = transport->srtt;
5456	status.sstat_primary.spinfo_rto = jiffies_to_msecs(j: transport->rto);
5457	status.sstat_primary.spinfo_mtu = transport->pathmtu;
5458
5459	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5460	status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5461
5462	if (put_user(len, optlen)) {
5463	retval = -EFAULT;
5464	goto out;
5465	}
5466
5467	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5468	__func__, len, status.sstat_state, status.sstat_rwnd,
5469	status.sstat_assoc_id);
5470
5471	if (copy_to_user(to: optval, from: &status, n: len)) {
5472	retval = -EFAULT;
5473	goto out;
5474	}
5475
5476	out:
5477	return retval;
5478	}
5479
5480
5481	/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5482	*
5483	* Applications can retrieve information about a specific peer address
5484	* of an association, including its reachability state, congestion
5485	* window, and retransmission timer values. This information is
5486	* read-only.
5487	*/
5488	static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5489	char __user *optval,
5490	int __user *optlen)
5491	{
5492	struct sctp_paddrinfo pinfo;
5493	struct sctp_transport *transport;
5494	int retval = 0;
5495
5496	if (len < sizeof(pinfo)) {
5497	retval = -EINVAL;
5498	goto out;
5499	}
5500
5501	len = sizeof(pinfo);
5502	if (copy_from_user(to: &pinfo, from: optval, n: len)) {
5503	retval = -EFAULT;
5504	goto out;
5505	}
5506
5507	transport = sctp_addr_id2transport(sk, addr: &pinfo.spinfo_address,
5508	id: pinfo.spinfo_assoc_id);
5509	if (!transport) {
5510	retval = -EINVAL;
5511	goto out;
5512	}
5513
5514	if (transport->state == SCTP_PF &&
5515	transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5516	retval = -EACCES;
5517	goto out;
5518	}
5519
5520	pinfo.spinfo_assoc_id = sctp_assoc2id(asoc: transport->asoc);
5521	pinfo.spinfo_state = transport->state;
5522	pinfo.spinfo_cwnd = transport->cwnd;
5523	pinfo.spinfo_srtt = transport->srtt;
5524	pinfo.spinfo_rto = jiffies_to_msecs(j: transport->rto);
5525	pinfo.spinfo_mtu = transport->pathmtu;
5526
5527	if (pinfo.spinfo_state == SCTP_UNKNOWN)
5528	pinfo.spinfo_state = SCTP_ACTIVE;
5529
5530	if (put_user(len, optlen)) {
5531	retval = -EFAULT;
5532	goto out;
5533	}
5534
5535	if (copy_to_user(to: optval, from: &pinfo, n: len)) {
5536	retval = -EFAULT;
5537	goto out;
5538	}
5539
5540	out:
5541	return retval;
5542	}
5543
5544	/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5545	*
5546	* This option is a on/off flag. If enabled no SCTP message
5547	* fragmentation will be performed. Instead if a message being sent
5548	* exceeds the current PMTU size, the message will NOT be sent and
5549	* instead a error will be indicated to the user.
5550	*/
5551	static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5552	char __user *optval, int __user *optlen)
5553	{
5554	int val;
5555
5556	if (len < sizeof(int))
5557	return -EINVAL;
5558
5559	len = sizeof(int);
5560	val = (sctp_sk(sk)->disable_fragments == 1);
5561	if (put_user(len, optlen))
5562	return -EFAULT;
5563	if (copy_to_user(to: optval, from: &val, n: len))
5564	return -EFAULT;
5565	return 0;
5566	}
5567
5568	/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5569	*
5570	* This socket option is used to specify various notifications and
5571	* ancillary data the user wishes to receive.
5572	*/
5573	static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5574	int __user *optlen)
5575	{
5576	struct sctp_event_subscribe subscribe;
5577	__u8 *sn_type = (__u8 *)&subscribe;
5578	int i;
5579
5580	if (len == 0)
5581	return -EINVAL;
5582	if (len > sizeof(struct sctp_event_subscribe))
5583	len = sizeof(struct sctp_event_subscribe);
5584	if (put_user(len, optlen))
5585	return -EFAULT;
5586
5587	for (i = 0; i < len; i++)
5588	sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5589	sn_type: SCTP_SN_TYPE_BASE + i);
5590
5591	if (copy_to_user(to: optval, from: &subscribe, n: len))
5592	return -EFAULT;
5593
5594	return 0;
5595	}
5596
5597	/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5598	*
5599	* This socket option is applicable to the UDP-style socket only. When
5600	* set it will cause associations that are idle for more than the
5601	* specified number of seconds to automatically close. An association
5602	* being idle is defined an association that has NOT sent or received
5603	* user data. The special value of '0' indicates that no automatic
5604	* close of any associations should be performed. The option expects an
5605	* integer defining the number of seconds of idle time before an
5606	* association is closed.
5607	*/
5608	static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5609	{
5610	/* Applicable to UDP-style socket only */
5611	if (sctp_style(sk, TCP))
5612	return -EOPNOTSUPP;
5613	if (len < sizeof(int))
5614	return -EINVAL;
5615	len = sizeof(int);
5616	if (put_user(len, optlen))
5617	return -EFAULT;
5618	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5619	return -EFAULT;
5620	return 0;
5621	}
5622
5623	/* Helper routine to branch off an association to a new socket. */
5624	int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5625	{
5626	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5627	struct sctp_sock *sp = sctp_sk(sk);
5628	struct socket *sock;
5629	int err = 0;
5630
5631	/* Do not peel off from one netns to another one. */
5632	if (!net_eq(current->nsproxy->net_ns, net2: sock_net(sk)))
5633	return -EINVAL;
5634
5635	if (!asoc)
5636	return -EINVAL;
5637
5638	/* An association cannot be branched off from an already peeled-off
5639	* socket, nor is this supported for tcp style sockets.
5640	*/
5641	if (!sctp_style(sk, UDP))
5642	return -EINVAL;
5643
5644	/* Create a new socket. */
5645	err = sock_create(family: sk->sk_family, type: SOCK_SEQPACKET, IPPROTO_SCTP, res: &sock);
5646	if (err < 0)
5647	return err;
5648
5649	sctp_copy_sock(newsk: sock->sk, sk, asoc);
5650
5651	/* Make peeled-off sockets more like 1-1 accepted sockets.
5652	* Set the daddr and initialize id to something more random and also
5653	* copy over any ip options.
5654	*/
5655	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5656	sp->pf->copy_ip_options(sk, sock->sk);
5657
5658	/* Populate the fields of the newsk from the oldsk and migrate the
5659	* asoc to the newsk.
5660	*/
5661	err = sctp_sock_migrate(oldsk: sk, newsk: sock->sk, assoc: asoc,
5662	type: SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5663	if (err) {
5664	sock_release(sock);
5665	sock = NULL;
5666	}
5667
5668	*sockp = sock;
5669
5670	return err;
5671	}
5672	EXPORT_SYMBOL(sctp_do_peeloff);
5673
5674	static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5675	struct file **newfile, unsigned flags)
5676	{
5677	struct socket *newsock;
5678	int retval;
5679
5680	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5681	if (retval < 0)
5682	goto out;
5683
5684	/* Map the socket to an unused fd that can be returned to the user. */
5685	retval = get_unused_fd_flags(flags: flags & SOCK_CLOEXEC);
5686	if (retval < 0) {
5687	sock_release(sock: newsock);
5688	goto out;
5689	}
5690
5691	*newfile = sock_alloc_file(sock: newsock, flags: 0, NULL);
5692	if (IS_ERR(ptr: *newfile)) {
5693	put_unused_fd(fd: retval);
5694	retval = PTR_ERR(ptr: *newfile);
5695	*newfile = NULL;
5696	return retval;
5697	}
5698
5699	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5700	retval);
5701
5702	peeloff->sd = retval;
5703
5704	if (flags & SOCK_NONBLOCK)
5705	(*newfile)->f_flags |= O_NONBLOCK;
5706	out:
5707	return retval;
5708	}
5709
5710	static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5711	{
5712	sctp_peeloff_arg_t peeloff;
5713	struct file *newfile = NULL;
5714	int retval = 0;
5715
5716	if (len < sizeof(sctp_peeloff_arg_t))
5717	return -EINVAL;
5718	len = sizeof(sctp_peeloff_arg_t);
5719	if (copy_from_user(to: &peeloff, from: optval, n: len))
5720	return -EFAULT;
5721
5722	retval = sctp_getsockopt_peeloff_common(sk, peeloff: &peeloff, newfile: &newfile, flags: 0);
5723	if (retval < 0)
5724	goto out;
5725
5726	/* Return the fd mapped to the new socket. */
5727	if (put_user(len, optlen)) {
5728	fput(newfile);
5729	put_unused_fd(fd: retval);
5730	return -EFAULT;
5731	}
5732
5733	if (copy_to_user(to: optval, from: &peeloff, n: len)) {
5734	fput(newfile);
5735	put_unused_fd(fd: retval);
5736	return -EFAULT;
5737	}
5738	fd_install(fd: retval, file: newfile);
5739	out:
5740	return retval;
5741	}
5742
5743	static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5744	char __user *optval, int __user *optlen)
5745	{
5746	sctp_peeloff_flags_arg_t peeloff;
5747	struct file *newfile = NULL;
5748	int retval = 0;
5749
5750	if (len < sizeof(sctp_peeloff_flags_arg_t))
5751	return -EINVAL;
5752	len = sizeof(sctp_peeloff_flags_arg_t);
5753	if (copy_from_user(to: &peeloff, from: optval, n: len))
5754	return -EFAULT;
5755
5756	retval = sctp_getsockopt_peeloff_common(sk, peeloff: &peeloff.p_arg,
5757	newfile: &newfile, flags: peeloff.flags);
5758	if (retval < 0)
5759	goto out;
5760
5761	/* Return the fd mapped to the new socket. */
5762	if (put_user(len, optlen)) {
5763	fput(newfile);
5764	put_unused_fd(fd: retval);
5765	return -EFAULT;
5766	}
5767
5768	if (copy_to_user(to: optval, from: &peeloff, n: len)) {
5769	fput(newfile);
5770	put_unused_fd(fd: retval);
5771	return -EFAULT;
5772	}
5773	fd_install(fd: retval, file: newfile);
5774	out:
5775	return retval;
5776	}
5777
5778	/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5779	*
5780	* Applications can enable or disable heartbeats for any peer address of
5781	* an association, modify an address's heartbeat interval, force a
5782	* heartbeat to be sent immediately, and adjust the address's maximum
5783	* number of retransmissions sent before an address is considered
5784	* unreachable. The following structure is used to access and modify an
5785	* address's parameters:
5786	*
5787	* struct sctp_paddrparams {
5788	* sctp_assoc_t spp_assoc_id;
5789	* struct sockaddr_storage spp_address;
5790	* uint32_t spp_hbinterval;
5791	* uint16_t spp_pathmaxrxt;
5792	* uint32_t spp_pathmtu;
5793	* uint32_t spp_sackdelay;
5794	* uint32_t spp_flags;
5795	* };
5796	*
5797	* spp_assoc_id - (one-to-many style socket) This is filled in the
5798	* application, and identifies the association for
5799	* this query.
5800	* spp_address - This specifies which address is of interest.
5801	* spp_hbinterval - This contains the value of the heartbeat interval,
5802	* in milliseconds. If a value of zero
5803	* is present in this field then no changes are to
5804	* be made to this parameter.
5805	* spp_pathmaxrxt - This contains the maximum number of
5806	* retransmissions before this address shall be
5807	* considered unreachable. If a value of zero
5808	* is present in this field then no changes are to
5809	* be made to this parameter.
5810	* spp_pathmtu - When Path MTU discovery is disabled the value
5811	* specified here will be the "fixed" path mtu.
5812	* Note that if the spp_address field is empty
5813	* then all associations on this address will
5814	* have this fixed path mtu set upon them.
5815	*
5816	* spp_sackdelay - When delayed sack is enabled, this value specifies
5817	* the number of milliseconds that sacks will be delayed
5818	* for. This value will apply to all addresses of an
5819	* association if the spp_address field is empty. Note
5820	* also, that if delayed sack is enabled and this
5821	* value is set to 0, no change is made to the last
5822	* recorded delayed sack timer value.
5823	*
5824	* spp_flags - These flags are used to control various features
5825	* on an association. The flag field may contain
5826	* zero or more of the following options.
5827	*
5828	* SPP_HB_ENABLE - Enable heartbeats on the
5829	* specified address. Note that if the address
5830	* field is empty all addresses for the association
5831	* have heartbeats enabled upon them.
5832	*
5833	* SPP_HB_DISABLE - Disable heartbeats on the
5834	* speicifed address. Note that if the address
5835	* field is empty all addresses for the association
5836	* will have their heartbeats disabled. Note also
5837	* that SPP_HB_ENABLE and SPP_HB_DISABLE are
5838	* mutually exclusive, only one of these two should
5839	* be specified. Enabling both fields will have
5840	* undetermined results.
5841	*
5842	* SPP_HB_DEMAND - Request a user initiated heartbeat
5843	* to be made immediately.
5844	*
5845	* SPP_PMTUD_ENABLE - This field will enable PMTU
5846	* discovery upon the specified address. Note that
5847	* if the address feild is empty then all addresses
5848	* on the association are effected.
5849	*
5850	* SPP_PMTUD_DISABLE - This field will disable PMTU
5851	* discovery upon the specified address. Note that
5852	* if the address feild is empty then all addresses
5853	* on the association are effected. Not also that
5854	* SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5855	* exclusive. Enabling both will have undetermined
5856	* results.
5857	*
5858	* SPP_SACKDELAY_ENABLE - Setting this flag turns
5859	* on delayed sack. The time specified in spp_sackdelay
5860	* is used to specify the sack delay for this address. Note
5861	* that if spp_address is empty then all addresses will
5862	* enable delayed sack and take on the sack delay
5863	* value specified in spp_sackdelay.
5864	* SPP_SACKDELAY_DISABLE - Setting this flag turns
5865	* off delayed sack. If the spp_address field is blank then
5866	* delayed sack is disabled for the entire association. Note
5867	* also that this field is mutually exclusive to
5868	* SPP_SACKDELAY_ENABLE, setting both will have undefined
5869	* results.
5870	*
5871	* SPP_IPV6_FLOWLABEL: Setting this flag enables the
5872	* setting of the IPV6 flow label value. The value is
5873	* contained in the spp_ipv6_flowlabel field.
5874	* Upon retrieval, this flag will be set to indicate that
5875	* the spp_ipv6_flowlabel field has a valid value returned.
5876	* If a specific destination address is set (in the
5877	* spp_address field), then the value returned is that of
5878	* the address. If just an association is specified (and
5879	* no address), then the association's default flow label
5880	* is returned. If neither an association nor a destination
5881	* is specified, then the socket's default flow label is
5882	* returned. For non-IPv6 sockets, this flag will be left
5883	* cleared.
5884	*
5885	* SPP_DSCP: Setting this flag enables the setting of the
5886	* Differentiated Services Code Point (DSCP) value
5887	* associated with either the association or a specific
5888	* address. The value is obtained in the spp_dscp field.
5889	* Upon retrieval, this flag will be set to indicate that
5890	* the spp_dscp field has a valid value returned. If a
5891	* specific destination address is set when called (in the
5892	* spp_address field), then that specific destination
5893	* address's DSCP value is returned. If just an association
5894	* is specified, then the association's default DSCP is
5895	* returned. If neither an association nor a destination is
5896	* specified, then the socket's default DSCP is returned.
5897	*
5898	* spp_ipv6_flowlabel
5899	* - This field is used in conjunction with the
5900	* SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5901	* The 20 least significant bits are used for the flow
5902	* label. This setting has precedence over any IPv6-layer
5903	* setting.
5904	*
5905	* spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5906	* and contains the DSCP. The 6 most significant bits are
5907	* used for the DSCP. This setting has precedence over any
5908	* IPv4- or IPv6- layer setting.
5909	*/
5910	static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5911	char __user *optval, int __user *optlen)
5912	{
5913	struct sctp_paddrparams params;
5914	struct sctp_transport *trans = NULL;
5915	struct sctp_association *asoc = NULL;
5916	struct sctp_sock *sp = sctp_sk(sk);
5917
5918	if (len >= sizeof(params))
5919	len = sizeof(params);
5920	else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5921	spp_ipv6_flowlabel), 4))
5922	len = ALIGN(offsetof(struct sctp_paddrparams,
5923	spp_ipv6_flowlabel), 4);
5924	else
5925	return -EINVAL;
5926
5927	if (copy_from_user(to: &params, from: optval, n: len))
5928	return -EFAULT;
5929
5930	/* If an address other than INADDR_ANY is specified, and
5931	* no transport is found, then the request is invalid.
5932	*/
5933	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params.spp_address)) {
5934	trans = sctp_addr_id2transport(sk, addr: &params.spp_address,
5935	id: params.spp_assoc_id);
5936	if (!trans) {
5937	pr_debug("%s: failed no transport\n", __func__);
5938	return -EINVAL;
5939	}
5940	}
5941
5942	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5943	* socket is a one to many style socket, and an association
5944	* was not found, then the id was invalid.
5945	*/
5946	asoc = sctp_id2assoc(sk, id: params.spp_assoc_id);
5947	if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5948	sctp_style(sk, UDP)) {
5949	pr_debug("%s: failed no association\n", __func__);
5950	return -EINVAL;
5951	}
5952
5953	if (trans) {
5954	/* Fetch transport values. */
5955	params.spp_hbinterval = jiffies_to_msecs(j: trans->hbinterval);
5956	params.spp_pathmtu = trans->pathmtu;
5957	params.spp_pathmaxrxt = trans->pathmaxrxt;
5958	params.spp_sackdelay = jiffies_to_msecs(j: trans->sackdelay);
5959
5960	/*draft-11 doesn't say what to return in spp_flags*/
5961	params.spp_flags = trans->param_flags;
5962	if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5963	params.spp_ipv6_flowlabel = trans->flowlabel &
5964	SCTP_FLOWLABEL_VAL_MASK;
5965	params.spp_flags |= SPP_IPV6_FLOWLABEL;
5966	}
5967	if (trans->dscp & SCTP_DSCP_SET_MASK) {
5968	params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5969	params.spp_flags |= SPP_DSCP;
5970	}
5971	} else if (asoc) {
5972	/* Fetch association values. */
5973	params.spp_hbinterval = jiffies_to_msecs(j: asoc->hbinterval);
5974	params.spp_pathmtu = asoc->pathmtu;
5975	params.spp_pathmaxrxt = asoc->pathmaxrxt;
5976	params.spp_sackdelay = jiffies_to_msecs(j: asoc->sackdelay);
5977
5978	/*draft-11 doesn't say what to return in spp_flags*/
5979	params.spp_flags = asoc->param_flags;
5980	if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5981	params.spp_ipv6_flowlabel = asoc->flowlabel &
5982	SCTP_FLOWLABEL_VAL_MASK;
5983	params.spp_flags |= SPP_IPV6_FLOWLABEL;
5984	}
5985	if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5986	params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5987	params.spp_flags |= SPP_DSCP;
5988	}
5989	} else {
5990	/* Fetch socket values. */
5991	params.spp_hbinterval = sp->hbinterval;
5992	params.spp_pathmtu = sp->pathmtu;
5993	params.spp_sackdelay = sp->sackdelay;
5994	params.spp_pathmaxrxt = sp->pathmaxrxt;
5995
5996	/*draft-11 doesn't say what to return in spp_flags*/
5997	params.spp_flags = sp->param_flags;
5998	if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5999	params.spp_ipv6_flowlabel = sp->flowlabel &
6000	SCTP_FLOWLABEL_VAL_MASK;
6001	params.spp_flags |= SPP_IPV6_FLOWLABEL;
6002	}
6003	if (sp->dscp & SCTP_DSCP_SET_MASK) {
6004	params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6005	params.spp_flags |= SPP_DSCP;
6006	}
6007	}
6008
6009	if (copy_to_user(to: optval, from: &params, n: len))
6010	return -EFAULT;
6011
6012	if (put_user(len, optlen))
6013	return -EFAULT;
6014
6015	return 0;
6016	}
6017
6018	/*
6019	* 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6020	*
6021	* This option will effect the way delayed acks are performed. This
6022	* option allows you to get or set the delayed ack time, in
6023	* milliseconds. It also allows changing the delayed ack frequency.
6024	* Changing the frequency to 1 disables the delayed sack algorithm. If
6025	* the assoc_id is 0, then this sets or gets the endpoints default
6026	* values. If the assoc_id field is non-zero, then the set or get
6027	* effects the specified association for the one to many model (the
6028	* assoc_id field is ignored by the one to one model). Note that if
6029	* sack_delay or sack_freq are 0 when setting this option, then the
6030	* current values will remain unchanged.
6031	*
6032	* struct sctp_sack_info {
6033	* sctp_assoc_t sack_assoc_id;
6034	* uint32_t sack_delay;
6035	* uint32_t sack_freq;
6036	* };
6037	*
6038	* sack_assoc_id - This parameter, indicates which association the user
6039	* is performing an action upon. Note that if this field's value is
6040	* zero then the endpoints default value is changed (effecting future
6041	* associations only).
6042	*
6043	* sack_delay - This parameter contains the number of milliseconds that
6044	* the user is requesting the delayed ACK timer be set to. Note that
6045	* this value is defined in the standard to be between 200 and 500
6046	* milliseconds.
6047	*
6048	* sack_freq - This parameter contains the number of packets that must
6049	* be received before a sack is sent without waiting for the delay
6050	* timer to expire. The default value for this is 2, setting this
6051	* value to 1 will disable the delayed sack algorithm.
6052	*/
6053	static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6054	char __user *optval,
6055	int __user *optlen)
6056	{
6057	struct sctp_sack_info params;
6058	struct sctp_association *asoc = NULL;
6059	struct sctp_sock *sp = sctp_sk(sk);
6060
6061	if (len >= sizeof(struct sctp_sack_info)) {
6062	len = sizeof(struct sctp_sack_info);
6063
6064	if (copy_from_user(to: &params, from: optval, n: len))
6065	return -EFAULT;
6066	} else if (len == sizeof(struct sctp_assoc_value)) {
6067	pr_warn_ratelimited(DEPRECATED
6068	"%s (pid %d) "
6069	"Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6070	"Use struct sctp_sack_info instead\n",
6071	current->comm, task_pid_nr(current));
6072	if (copy_from_user(to: &params, from: optval, n: len))
6073	return -EFAULT;
6074	} else
6075	return -EINVAL;
6076
6077	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6078	* socket is a one to many style socket, and an association
6079	* was not found, then the id was invalid.
6080	*/
6081	asoc = sctp_id2assoc(sk, id: params.sack_assoc_id);
6082	if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6083	sctp_style(sk, UDP))
6084	return -EINVAL;
6085
6086	if (asoc) {
6087	/* Fetch association values. */
6088	if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6089	params.sack_delay = jiffies_to_msecs(j: asoc->sackdelay);
6090	params.sack_freq = asoc->sackfreq;
6091
6092	} else {
6093	params.sack_delay = 0;
6094	params.sack_freq = 1;
6095	}
6096	} else {
6097	/* Fetch socket values. */
6098	if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6099	params.sack_delay = sp->sackdelay;
6100	params.sack_freq = sp->sackfreq;
6101	} else {
6102	params.sack_delay = 0;
6103	params.sack_freq = 1;
6104	}
6105	}
6106
6107	if (copy_to_user(to: optval, from: &params, n: len))
6108	return -EFAULT;
6109
6110	if (put_user(len, optlen))
6111	return -EFAULT;
6112
6113	return 0;
6114	}
6115
6116	/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6117	*
6118	* Applications can specify protocol parameters for the default association
6119	* initialization. The option name argument to setsockopt() and getsockopt()
6120	* is SCTP_INITMSG.
6121	*
6122	* Setting initialization parameters is effective only on an unconnected
6123	* socket (for UDP-style sockets only future associations are effected
6124	* by the change). With TCP-style sockets, this option is inherited by
6125	* sockets derived from a listener socket.
6126	*/
6127	static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6128	{
6129	if (len < sizeof(struct sctp_initmsg))
6130	return -EINVAL;
6131	len = sizeof(struct sctp_initmsg);
6132	if (put_user(len, optlen))
6133	return -EFAULT;
6134	if (copy_to_user(to: optval, from: &sctp_sk(sk)->initmsg, n: len))
6135	return -EFAULT;
6136	return 0;
6137	}
6138
6139
6140	static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6141	char __user *optval, int __user *optlen)
6142	{
6143	struct sctp_association *asoc;
6144	int cnt = 0;
6145	struct sctp_getaddrs getaddrs;
6146	struct sctp_transport *from;
6147	void __user *to;
6148	union sctp_addr temp;
6149	struct sctp_sock *sp = sctp_sk(sk);
6150	int addrlen;
6151	size_t space_left;
6152	int bytes_copied;
6153
6154	if (len < sizeof(struct sctp_getaddrs))
6155	return -EINVAL;
6156
6157	if (copy_from_user(to: &getaddrs, from: optval, n: sizeof(struct sctp_getaddrs)))
6158	return -EFAULT;
6159
6160	/* For UDP-style sockets, id specifies the association to query. */
6161	asoc = sctp_id2assoc(sk, id: getaddrs.assoc_id);
6162	if (!asoc)
6163	return -EINVAL;
6164
6165	to = optval + offsetof(struct sctp_getaddrs, addrs);
6166	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6167
6168	list_for_each_entry(from, &asoc->peer.transport_addr_list,
6169	transports) {
6170	memcpy(&temp, &from->ipaddr, sizeof(temp));
6171	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6172	->addr_to_user(sp, &temp);
6173	if (space_left < addrlen)
6174	return -ENOMEM;
6175	if (copy_to_user(to, from: &temp, n: addrlen))
6176	return -EFAULT;
6177	to += addrlen;
6178	cnt++;
6179	space_left -= addrlen;
6180	}
6181
6182	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6183	return -EFAULT;
6184	bytes_copied = ((char __user *)to) - optval;
6185	if (put_user(bytes_copied, optlen))
6186	return -EFAULT;
6187
6188	return 0;
6189	}
6190
6191	static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6192	size_t space_left, int *bytes_copied)
6193	{
6194	struct sctp_sockaddr_entry *addr;
6195	union sctp_addr temp;
6196	int cnt = 0;
6197	int addrlen;
6198	struct net *net = sock_net(sk);
6199
6200	rcu_read_lock();
6201	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6202	if (!addr->valid)
6203	continue;
6204
6205	if ((PF_INET == sk->sk_family) &&
6206	(AF_INET6 == addr->a.sa.sa_family))
6207	continue;
6208	if ((PF_INET6 == sk->sk_family) &&
6209	inet_v6_ipv6only(sk) &&
6210	(AF_INET == addr->a.sa.sa_family))
6211	continue;
6212	memcpy(&temp, &addr->a, sizeof(temp));
6213	if (!temp.v4.sin_port)
6214	temp.v4.sin_port = htons(port);
6215
6216	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6217	->addr_to_user(sctp_sk(sk), &temp);
6218
6219	if (space_left < addrlen) {
6220	cnt = -ENOMEM;
6221	break;
6222	}
6223	memcpy(to, &temp, addrlen);
6224
6225	to += addrlen;
6226	cnt++;
6227	space_left -= addrlen;
6228	*bytes_copied += addrlen;
6229	}
6230	rcu_read_unlock();
6231
6232	return cnt;
6233	}
6234
6235
6236	static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6237	char __user *optval, int __user *optlen)
6238	{
6239	struct sctp_bind_addr *bp;
6240	struct sctp_association *asoc;
6241	int cnt = 0;
6242	struct sctp_getaddrs getaddrs;
6243	struct sctp_sockaddr_entry *addr;
6244	void __user *to;
6245	union sctp_addr temp;
6246	struct sctp_sock *sp = sctp_sk(sk);
6247	int addrlen;
6248	int err = 0;
6249	size_t space_left;
6250	int bytes_copied = 0;
6251	void *addrs;
6252	void *buf;
6253
6254	if (len < sizeof(struct sctp_getaddrs))
6255	return -EINVAL;
6256
6257	if (copy_from_user(to: &getaddrs, from: optval, n: sizeof(struct sctp_getaddrs)))
6258	return -EFAULT;
6259
6260	/*
6261	* For UDP-style sockets, id specifies the association to query.
6262	* If the id field is set to the value '0' then the locally bound
6263	* addresses are returned without regard to any particular
6264	* association.
6265	*/
6266	if (0 == getaddrs.assoc_id) {
6267	bp = &sctp_sk(sk)->ep->base.bind_addr;
6268	} else {
6269	asoc = sctp_id2assoc(sk, id: getaddrs.assoc_id);
6270	if (!asoc)
6271	return -EINVAL;
6272	bp = &asoc->base.bind_addr;
6273	}
6274
6275	to = optval + offsetof(struct sctp_getaddrs, addrs);
6276	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6277
6278	addrs = kmalloc(size: space_left, GFP_USER | __GFP_NOWARN);
6279	if (!addrs)
6280	return -ENOMEM;
6281
6282	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6283	* addresses from the global local address list.
6284	*/
6285	if (sctp_list_single_entry(head: &bp->address_list)) {
6286	addr = list_entry(bp->address_list.next,
6287	struct sctp_sockaddr_entry, list);
6288	if (sctp_is_any(sk, addr: &addr->a)) {
6289	cnt = sctp_copy_laddrs(sk, port: bp->port, to: addrs,
6290	space_left, bytes_copied: &bytes_copied);
6291	if (cnt < 0) {
6292	err = cnt;
6293	goto out;
6294	}
6295	goto copy_getaddrs;
6296	}
6297	}
6298
6299	buf = addrs;
6300	/* Protection on the bound address list is not needed since
6301	* in the socket option context we hold a socket lock and
6302	* thus the bound address list can't change.
6303	*/
6304	list_for_each_entry(addr, &bp->address_list, list) {
6305	memcpy(&temp, &addr->a, sizeof(temp));
6306	addrlen = sctp_get_pf_specific(family: sk->sk_family)
6307	->addr_to_user(sp, &temp);
6308	if (space_left < addrlen) {
6309	err = -ENOMEM; /*fixme: right error?*/
6310	goto out;
6311	}
6312	memcpy(buf, &temp, addrlen);
6313	buf += addrlen;
6314	bytes_copied += addrlen;
6315	cnt++;
6316	space_left -= addrlen;
6317	}
6318
6319	copy_getaddrs:
6320	if (copy_to_user(to, from: addrs, n: bytes_copied)) {
6321	err = -EFAULT;
6322	goto out;
6323	}
6324	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6325	err = -EFAULT;
6326	goto out;
6327	}
6328	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6329	* but we can't change it anymore.
6330	*/
6331	if (put_user(bytes_copied, optlen))
6332	err = -EFAULT;
6333	out:
6334	kfree(objp: addrs);
6335	return err;
6336	}
6337
6338	/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6339	*
6340	* Requests that the local SCTP stack use the enclosed peer address as
6341	* the association primary. The enclosed address must be one of the
6342	* association peer's addresses.
6343	*/
6344	static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6345	char __user *optval, int __user *optlen)
6346	{
6347	struct sctp_prim prim;
6348	struct sctp_association *asoc;
6349	struct sctp_sock *sp = sctp_sk(sk);
6350
6351	if (len < sizeof(struct sctp_prim))
6352	return -EINVAL;
6353
6354	len = sizeof(struct sctp_prim);
6355
6356	if (copy_from_user(to: &prim, from: optval, n: len))
6357	return -EFAULT;
6358
6359	asoc = sctp_id2assoc(sk, id: prim.ssp_assoc_id);
6360	if (!asoc)
6361	return -EINVAL;
6362
6363	if (!asoc->peer.primary_path)
6364	return -ENOTCONN;
6365
6366	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6367	asoc->peer.primary_path->af_specific->sockaddr_len);
6368
6369	sctp_get_pf_specific(family: sk->sk_family)->addr_to_user(sp,
6370	(union sctp_addr *)&prim.ssp_addr);
6371
6372	if (put_user(len, optlen))
6373	return -EFAULT;
6374	if (copy_to_user(to: optval, from: &prim, n: len))
6375	return -EFAULT;
6376
6377	return 0;
6378	}
6379
6380	/*
6381	* 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6382	*
6383	* Requests that the local endpoint set the specified Adaptation Layer
6384	* Indication parameter for all future INIT and INIT-ACK exchanges.
6385	*/
6386	static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6387	char __user *optval, int __user *optlen)
6388	{
6389	struct sctp_setadaptation adaptation;
6390
6391	if (len < sizeof(struct sctp_setadaptation))
6392	return -EINVAL;
6393
6394	len = sizeof(struct sctp_setadaptation);
6395
6396	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6397
6398	if (put_user(len, optlen))
6399	return -EFAULT;
6400	if (copy_to_user(to: optval, from: &adaptation, n: len))
6401	return -EFAULT;
6402
6403	return 0;
6404	}
6405
6406	/*
6407	*
6408	* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6409	*
6410	* Applications that wish to use the sendto() system call may wish to
6411	* specify a default set of parameters that would normally be supplied
6412	* through the inclusion of ancillary data. This socket option allows
6413	* such an application to set the default sctp_sndrcvinfo structure.
6414
6415
6416	* The application that wishes to use this socket option simply passes
6417	* in to this call the sctp_sndrcvinfo structure defined in Section
6418	* 5.2.2) The input parameters accepted by this call include
6419	* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6420	* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6421	* to this call if the caller is using the UDP model.
6422	*
6423	* For getsockopt, it get the default sctp_sndrcvinfo structure.
6424	*/
6425	static int sctp_getsockopt_default_send_param(struct sock *sk,
6426	int len, char __user *optval,
6427	int __user *optlen)
6428	{
6429	struct sctp_sock *sp = sctp_sk(sk);
6430	struct sctp_association *asoc;
6431	struct sctp_sndrcvinfo info;
6432
6433	if (len < sizeof(info))
6434	return -EINVAL;
6435
6436	len = sizeof(info);
6437
6438	if (copy_from_user(to: &info, from: optval, n: len))
6439	return -EFAULT;
6440
6441	asoc = sctp_id2assoc(sk, id: info.sinfo_assoc_id);
6442	if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6443	sctp_style(sk, UDP))
6444	return -EINVAL;
6445
6446	if (asoc) {
6447	info.sinfo_stream = asoc->default_stream;
6448	info.sinfo_flags = asoc->default_flags;
6449	info.sinfo_ppid = asoc->default_ppid;
6450	info.sinfo_context = asoc->default_context;
6451	info.sinfo_timetolive = asoc->default_timetolive;
6452	} else {
6453	info.sinfo_stream = sp->default_stream;
6454	info.sinfo_flags = sp->default_flags;
6455	info.sinfo_ppid = sp->default_ppid;
6456	info.sinfo_context = sp->default_context;
6457	info.sinfo_timetolive = sp->default_timetolive;
6458	}
6459
6460	if (put_user(len, optlen))
6461	return -EFAULT;
6462	if (copy_to_user(to: optval, from: &info, n: len))
6463	return -EFAULT;
6464
6465	return 0;
6466	}
6467
6468	/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6469	* (SCTP_DEFAULT_SNDINFO)
6470	*/
6471	static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6472	char __user *optval,
6473	int __user *optlen)
6474	{
6475	struct sctp_sock *sp = sctp_sk(sk);
6476	struct sctp_association *asoc;
6477	struct sctp_sndinfo info;
6478
6479	if (len < sizeof(info))
6480	return -EINVAL;
6481
6482	len = sizeof(info);
6483
6484	if (copy_from_user(to: &info, from: optval, n: len))
6485	return -EFAULT;
6486
6487	asoc = sctp_id2assoc(sk, id: info.snd_assoc_id);
6488	if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6489	sctp_style(sk, UDP))
6490	return -EINVAL;
6491
6492	if (asoc) {
6493	info.snd_sid = asoc->default_stream;
6494	info.snd_flags = asoc->default_flags;
6495	info.snd_ppid = asoc->default_ppid;
6496	info.snd_context = asoc->default_context;
6497	} else {
6498	info.snd_sid = sp->default_stream;
6499	info.snd_flags = sp->default_flags;
6500	info.snd_ppid = sp->default_ppid;
6501	info.snd_context = sp->default_context;
6502	}
6503
6504	if (put_user(len, optlen))
6505	return -EFAULT;
6506	if (copy_to_user(to: optval, from: &info, n: len))
6507	return -EFAULT;
6508
6509	return 0;
6510	}
6511
6512	/*
6513	*
6514	* 7.1.5 SCTP_NODELAY
6515	*
6516	* Turn on/off any Nagle-like algorithm. This means that packets are
6517	* generally sent as soon as possible and no unnecessary delays are
6518	* introduced, at the cost of more packets in the network. Expects an
6519	* integer boolean flag.
6520	*/
6521
6522	static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6523	char __user *optval, int __user *optlen)
6524	{
6525	int val;
6526
6527	if (len < sizeof(int))
6528	return -EINVAL;
6529
6530	len = sizeof(int);
6531	val = (sctp_sk(sk)->nodelay == 1);
6532	if (put_user(len, optlen))
6533	return -EFAULT;
6534	if (copy_to_user(to: optval, from: &val, n: len))
6535	return -EFAULT;
6536	return 0;
6537	}
6538
6539	/*
6540	*
6541	* 7.1.1 SCTP_RTOINFO
6542	*
6543	* The protocol parameters used to initialize and bound retransmission
6544	* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6545	* and modify these parameters.
6546	* All parameters are time values, in milliseconds. A value of 0, when
6547	* modifying the parameters, indicates that the current value should not
6548	* be changed.
6549	*
6550	*/
6551	static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6552	char __user *optval,
6553	int __user *optlen) {
6554	struct sctp_rtoinfo rtoinfo;
6555	struct sctp_association *asoc;
6556
6557	if (len < sizeof (struct sctp_rtoinfo))
6558	return -EINVAL;
6559
6560	len = sizeof(struct sctp_rtoinfo);
6561
6562	if (copy_from_user(to: &rtoinfo, from: optval, n: len))
6563	return -EFAULT;
6564
6565	asoc = sctp_id2assoc(sk, id: rtoinfo.srto_assoc_id);
6566
6567	if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6568	sctp_style(sk, UDP))
6569	return -EINVAL;
6570
6571	/* Values corresponding to the specific association. */
6572	if (asoc) {
6573	rtoinfo.srto_initial = jiffies_to_msecs(j: asoc->rto_initial);
6574	rtoinfo.srto_max = jiffies_to_msecs(j: asoc->rto_max);
6575	rtoinfo.srto_min = jiffies_to_msecs(j: asoc->rto_min);
6576	} else {
6577	/* Values corresponding to the endpoint. */
6578	struct sctp_sock *sp = sctp_sk(sk);
6579
6580	rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6581	rtoinfo.srto_max = sp->rtoinfo.srto_max;
6582	rtoinfo.srto_min = sp->rtoinfo.srto_min;
6583	}
6584
6585	if (put_user(len, optlen))
6586	return -EFAULT;
6587
6588	if (copy_to_user(to: optval, from: &rtoinfo, n: len))
6589	return -EFAULT;
6590
6591	return 0;
6592	}
6593
6594	/*
6595	*
6596	* 7.1.2 SCTP_ASSOCINFO
6597	*
6598	* This option is used to tune the maximum retransmission attempts
6599	* of the association.
6600	* Returns an error if the new association retransmission value is
6601	* greater than the sum of the retransmission value of the peer.
6602	* See [SCTP] for more information.
6603	*
6604	*/
6605	static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6606	char __user *optval,
6607	int __user *optlen)
6608	{
6609
6610	struct sctp_assocparams assocparams;
6611	struct sctp_association *asoc;
6612	struct list_head *pos;
6613	int cnt = 0;
6614
6615	if (len < sizeof (struct sctp_assocparams))
6616	return -EINVAL;
6617
6618	len = sizeof(struct sctp_assocparams);
6619
6620	if (copy_from_user(to: &assocparams, from: optval, n: len))
6621	return -EFAULT;
6622
6623	asoc = sctp_id2assoc(sk, id: assocparams.sasoc_assoc_id);
6624
6625	if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6626	sctp_style(sk, UDP))
6627	return -EINVAL;
6628
6629	/* Values correspoinding to the specific association */
6630	if (asoc) {
6631	assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6632	assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6633	assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6634	assocparams.sasoc_cookie_life = ktime_to_ms(kt: asoc->cookie_life);
6635
6636	list_for_each(pos, &asoc->peer.transport_addr_list) {
6637	cnt++;
6638	}
6639
6640	assocparams.sasoc_number_peer_destinations = cnt;
6641	} else {
6642	/* Values corresponding to the endpoint */
6643	struct sctp_sock *sp = sctp_sk(sk);
6644
6645	assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6646	assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6647	assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6648	assocparams.sasoc_cookie_life =
6649	sp->assocparams.sasoc_cookie_life;
6650	assocparams.sasoc_number_peer_destinations =
6651	sp->assocparams.
6652	sasoc_number_peer_destinations;
6653	}
6654
6655	if (put_user(len, optlen))
6656	return -EFAULT;
6657
6658	if (copy_to_user(to: optval, from: &assocparams, n: len))
6659	return -EFAULT;
6660
6661	return 0;
6662	}
6663
6664	/*
6665	* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6666	*
6667	* This socket option is a boolean flag which turns on or off mapped V4
6668	* addresses. If this option is turned on and the socket is type
6669	* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6670	* If this option is turned off, then no mapping will be done of V4
6671	* addresses and a user will receive both PF_INET6 and PF_INET type
6672	* addresses on the socket.
6673	*/
6674	static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6675	char __user *optval, int __user *optlen)
6676	{
6677	int val;
6678	struct sctp_sock *sp = sctp_sk(sk);
6679
6680	if (len < sizeof(int))
6681	return -EINVAL;
6682
6683	len = sizeof(int);
6684	val = sp->v4mapped;
6685	if (put_user(len, optlen))
6686	return -EFAULT;
6687	if (copy_to_user(to: optval, from: &val, n: len))
6688	return -EFAULT;
6689
6690	return 0;
6691	}
6692
6693	/*
6694	* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6695	* (chapter and verse is quoted at sctp_setsockopt_context())
6696	*/
6697	static int sctp_getsockopt_context(struct sock *sk, int len,
6698	char __user *optval, int __user *optlen)
6699	{
6700	struct sctp_assoc_value params;
6701	struct sctp_association *asoc;
6702
6703	if (len < sizeof(struct sctp_assoc_value))
6704	return -EINVAL;
6705
6706	len = sizeof(struct sctp_assoc_value);
6707
6708	if (copy_from_user(to: &params, from: optval, n: len))
6709	return -EFAULT;
6710
6711	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6712	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6713	sctp_style(sk, UDP))
6714	return -EINVAL;
6715
6716	params.assoc_value = asoc ? asoc->default_rcv_context
6717	: sctp_sk(sk)->default_rcv_context;
6718
6719	if (put_user(len, optlen))
6720	return -EFAULT;
6721	if (copy_to_user(to: optval, from: &params, n: len))
6722	return -EFAULT;
6723
6724	return 0;
6725	}
6726
6727	/*
6728	* 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6729	* This option will get or set the maximum size to put in any outgoing
6730	* SCTP DATA chunk. If a message is larger than this size it will be
6731	* fragmented by SCTP into the specified size. Note that the underlying
6732	* SCTP implementation may fragment into smaller sized chunks when the
6733	* PMTU of the underlying association is smaller than the value set by
6734	* the user. The default value for this option is '0' which indicates
6735	* the user is NOT limiting fragmentation and only the PMTU will effect
6736	* SCTP's choice of DATA chunk size. Note also that values set larger
6737	* than the maximum size of an IP datagram will effectively let SCTP
6738	* control fragmentation (i.e. the same as setting this option to 0).
6739	*
6740	* The following structure is used to access and modify this parameter:
6741	*
6742	* struct sctp_assoc_value {
6743	* sctp_assoc_t assoc_id;
6744	* uint32_t assoc_value;
6745	* };
6746	*
6747	* assoc_id: This parameter is ignored for one-to-one style sockets.
6748	* For one-to-many style sockets this parameter indicates which
6749	* association the user is performing an action upon. Note that if
6750	* this field's value is zero then the endpoints default value is
6751	* changed (effecting future associations only).
6752	* assoc_value: This parameter specifies the maximum size in bytes.
6753	*/
6754	static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6755	char __user *optval, int __user *optlen)
6756	{
6757	struct sctp_assoc_value params;
6758	struct sctp_association *asoc;
6759
6760	if (len == sizeof(int)) {
6761	pr_warn_ratelimited(DEPRECATED
6762	"%s (pid %d) "
6763	"Use of int in maxseg socket option.\n"
6764	"Use struct sctp_assoc_value instead\n",
6765	current->comm, task_pid_nr(current));
6766	params.assoc_id = SCTP_FUTURE_ASSOC;
6767	} else if (len >= sizeof(struct sctp_assoc_value)) {
6768	len = sizeof(struct sctp_assoc_value);
6769	if (copy_from_user(to: &params, from: optval, n: len))
6770	return -EFAULT;
6771	} else
6772	return -EINVAL;
6773
6774	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6775	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6776	sctp_style(sk, UDP))
6777	return -EINVAL;
6778
6779	if (asoc)
6780	params.assoc_value = asoc->frag_point;
6781	else
6782	params.assoc_value = sctp_sk(sk)->user_frag;
6783
6784	if (put_user(len, optlen))
6785	return -EFAULT;
6786	if (len == sizeof(int)) {
6787	if (copy_to_user(to: optval, from: &params.assoc_value, n: len))
6788	return -EFAULT;
6789	} else {
6790	if (copy_to_user(to: optval, from: &params, n: len))
6791	return -EFAULT;
6792	}
6793
6794	return 0;
6795	}
6796
6797	/*
6798	* 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6799	* (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6800	*/
6801	static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6802	char __user *optval, int __user *optlen)
6803	{
6804	int val;
6805
6806	if (len < sizeof(int))
6807	return -EINVAL;
6808
6809	len = sizeof(int);
6810
6811	val = sctp_sk(sk)->frag_interleave;
6812	if (put_user(len, optlen))
6813	return -EFAULT;
6814	if (copy_to_user(to: optval, from: &val, n: len))
6815	return -EFAULT;
6816
6817	return 0;
6818	}
6819
6820	/*
6821	* 7.1.25. Set or Get the sctp partial delivery point
6822	* (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6823	*/
6824	static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6825	char __user *optval,
6826	int __user *optlen)
6827	{
6828	u32 val;
6829
6830	if (len < sizeof(u32))
6831	return -EINVAL;
6832
6833	len = sizeof(u32);
6834
6835	val = sctp_sk(sk)->pd_point;
6836	if (put_user(len, optlen))
6837	return -EFAULT;
6838	if (copy_to_user(to: optval, from: &val, n: len))
6839	return -EFAULT;
6840
6841	return 0;
6842	}
6843
6844	/*
6845	* 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6846	* (chapter and verse is quoted at sctp_setsockopt_maxburst())
6847	*/
6848	static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6849	char __user *optval,
6850	int __user *optlen)
6851	{
6852	struct sctp_assoc_value params;
6853	struct sctp_association *asoc;
6854
6855	if (len == sizeof(int)) {
6856	pr_warn_ratelimited(DEPRECATED
6857	"%s (pid %d) "
6858	"Use of int in max_burst socket option.\n"
6859	"Use struct sctp_assoc_value instead\n",
6860	current->comm, task_pid_nr(current));
6861	params.assoc_id = SCTP_FUTURE_ASSOC;
6862	} else if (len >= sizeof(struct sctp_assoc_value)) {
6863	len = sizeof(struct sctp_assoc_value);
6864	if (copy_from_user(to: &params, from: optval, n: len))
6865	return -EFAULT;
6866	} else
6867	return -EINVAL;
6868
6869	asoc = sctp_id2assoc(sk, id: params.assoc_id);
6870	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6871	sctp_style(sk, UDP))
6872	return -EINVAL;
6873
6874	params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6875
6876	if (len == sizeof(int)) {
6877	if (copy_to_user(to: optval, from: &params.assoc_value, n: len))
6878	return -EFAULT;
6879	} else {
6880	if (copy_to_user(to: optval, from: &params, n: len))
6881	return -EFAULT;
6882	}
6883
6884	return 0;
6885
6886	}
6887
6888	static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6889	char __user *optval, int __user *optlen)
6890	{
6891	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6892	struct sctp_hmacalgo __user *p = (void __user *)optval;
6893	struct sctp_hmac_algo_param *hmacs;
6894	__u16 data_len = 0;
6895	u32 num_idents;
6896	int i;
6897
6898	if (!ep->auth_enable)
6899	return -EACCES;
6900
6901	hmacs = ep->auth_hmacs_list;
6902	data_len = ntohs(hmacs->param_hdr.length) -
6903	sizeof(struct sctp_paramhdr);
6904
6905	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6906	return -EINVAL;
6907
6908	len = sizeof(struct sctp_hmacalgo) + data_len;
6909	num_idents = data_len / sizeof(u16);
6910
6911	if (put_user(len, optlen))
6912	return -EFAULT;
6913	if (put_user(num_idents, &p->shmac_num_idents))
6914	return -EFAULT;
6915	for (i = 0; i < num_idents; i++) {
6916	__u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6917
6918	if (copy_to_user(to: &p->shmac_idents[i], from: &hmacid, n: sizeof(__u16)))
6919	return -EFAULT;
6920	}
6921	return 0;
6922	}
6923
6924	static int sctp_getsockopt_active_key(struct sock *sk, int len,
6925	char __user *optval, int __user *optlen)
6926	{
6927	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6928	struct sctp_authkeyid val;
6929	struct sctp_association *asoc;
6930
6931	if (len < sizeof(struct sctp_authkeyid))
6932	return -EINVAL;
6933
6934	len = sizeof(struct sctp_authkeyid);
6935	if (copy_from_user(to: &val, from: optval, n: len))
6936	return -EFAULT;
6937
6938	asoc = sctp_id2assoc(sk, id: val.scact_assoc_id);
6939	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6940	return -EINVAL;
6941
6942	if (asoc) {
6943	if (!asoc->peer.auth_capable)
6944	return -EACCES;
6945	val.scact_keynumber = asoc->active_key_id;
6946	} else {
6947	if (!ep->auth_enable)
6948	return -EACCES;
6949	val.scact_keynumber = ep->active_key_id;
6950	}
6951
6952	if (put_user(len, optlen))
6953	return -EFAULT;
6954	if (copy_to_user(to: optval, from: &val, n: len))
6955	return -EFAULT;
6956
6957	return 0;
6958	}
6959
6960	static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6961	char __user *optval, int __user *optlen)
6962	{
6963	struct sctp_authchunks __user *p = (void __user *)optval;
6964	struct sctp_authchunks val;
6965	struct sctp_association *asoc;
6966	struct sctp_chunks_param *ch;
6967	u32 num_chunks = 0;
6968	char __user *to;
6969
6970	if (len < sizeof(struct sctp_authchunks))
6971	return -EINVAL;
6972
6973	if (copy_from_user(to: &val, from: optval, n: sizeof(val)))
6974	return -EFAULT;
6975
6976	to = p->gauth_chunks;
6977	asoc = sctp_id2assoc(sk, id: val.gauth_assoc_id);
6978	if (!asoc)
6979	return -EINVAL;
6980
6981	if (!asoc->peer.auth_capable)
6982	return -EACCES;
6983
6984	ch = asoc->peer.peer_chunks;
6985	if (!ch)
6986	goto num;
6987
6988	/* See if the user provided enough room for all the data */
6989	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6990	if (len < num_chunks)
6991	return -EINVAL;
6992
6993	if (copy_to_user(to, from: ch->chunks, n: num_chunks))
6994	return -EFAULT;
6995	num:
6996	len = sizeof(struct sctp_authchunks) + num_chunks;
6997	if (put_user(len, optlen))
6998	return -EFAULT;
6999	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7000	return -EFAULT;
7001	return 0;
7002	}
7003
7004	static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7005	char __user *optval, int __user *optlen)
7006	{
7007	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7008	struct sctp_authchunks __user *p = (void __user *)optval;
7009	struct sctp_authchunks val;
7010	struct sctp_association *asoc;
7011	struct sctp_chunks_param *ch;
7012	u32 num_chunks = 0;
7013	char __user *to;
7014
7015	if (len < sizeof(struct sctp_authchunks))
7016	return -EINVAL;
7017
7018	if (copy_from_user(to: &val, from: optval, n: sizeof(val)))
7019	return -EFAULT;
7020
7021	to = p->gauth_chunks;
7022	asoc = sctp_id2assoc(sk, id: val.gauth_assoc_id);
7023	if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7024	sctp_style(sk, UDP))
7025	return -EINVAL;
7026
7027	if (asoc) {
7028	if (!asoc->peer.auth_capable)
7029	return -EACCES;
7030	ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7031	} else {
7032	if (!ep->auth_enable)
7033	return -EACCES;
7034	ch = ep->auth_chunk_list;
7035	}
7036	if (!ch)
7037	goto num;
7038
7039	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7040	if (len < sizeof(struct sctp_authchunks) + num_chunks)
7041	return -EINVAL;
7042
7043	if (copy_to_user(to, from: ch->chunks, n: num_chunks))
7044	return -EFAULT;
7045	num:
7046	len = sizeof(struct sctp_authchunks) + num_chunks;
7047	if (put_user(len, optlen))
7048	return -EFAULT;
7049	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7050	return -EFAULT;
7051
7052	return 0;
7053	}
7054
7055	/*
7056	* 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7057	* This option gets the current number of associations that are attached
7058	* to a one-to-many style socket. The option value is an uint32_t.
7059	*/
7060	static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7061	char __user *optval, int __user *optlen)
7062	{
7063	struct sctp_sock *sp = sctp_sk(sk);
7064	struct sctp_association *asoc;
7065	u32 val = 0;
7066
7067	if (sctp_style(sk, TCP))
7068	return -EOPNOTSUPP;
7069
7070	if (len < sizeof(u32))
7071	return -EINVAL;
7072
7073	len = sizeof(u32);
7074
7075	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7076	val++;
7077	}
7078
7079	if (put_user(len, optlen))
7080	return -EFAULT;
7081	if (copy_to_user(to: optval, from: &val, n: len))
7082	return -EFAULT;
7083
7084	return 0;
7085	}
7086
7087	/*
7088	* 8.1.23 SCTP_AUTO_ASCONF
7089	* See the corresponding setsockopt entry as description
7090	*/
7091	static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7092	char __user *optval, int __user *optlen)
7093	{
7094	int val = 0;
7095
7096	if (len < sizeof(int))
7097	return -EINVAL;
7098
7099	len = sizeof(int);
7100	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7101	val = 1;
7102	if (put_user(len, optlen))
7103	return -EFAULT;
7104	if (copy_to_user(to: optval, from: &val, n: len))
7105	return -EFAULT;
7106	return 0;
7107	}
7108
7109	/*
7110	* 8.2.6. Get the Current Identifiers of Associations
7111	* (SCTP_GET_ASSOC_ID_LIST)
7112	*
7113	* This option gets the current list of SCTP association identifiers of
7114	* the SCTP associations handled by a one-to-many style socket.
7115	*/
7116	static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7117	char __user *optval, int __user *optlen)
7118	{
7119	struct sctp_sock *sp = sctp_sk(sk);
7120	struct sctp_association *asoc;
7121	struct sctp_assoc_ids *ids;
7122	u32 num = 0;
7123
7124	if (sctp_style(sk, TCP))
7125	return -EOPNOTSUPP;
7126
7127	if (len < sizeof(struct sctp_assoc_ids))
7128	return -EINVAL;
7129
7130	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7131	num++;
7132	}
7133
7134	if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7135	return -EINVAL;
7136
7137	len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7138
7139	ids = kmalloc(size: len, GFP_USER | __GFP_NOWARN);
7140	if (unlikely(!ids))
7141	return -ENOMEM;
7142
7143	ids->gaids_number_of_ids = num;
7144	num = 0;
7145	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7146	ids->gaids_assoc_id[num++] = asoc->assoc_id;
7147	}
7148
7149	if (put_user(len, optlen) || copy_to_user(to: optval, from: ids, n: len)) {
7150	kfree(objp: ids);
7151	return -EFAULT;
7152	}
7153
7154	kfree(objp: ids);
7155	return 0;
7156	}
7157
7158	/*
7159	* SCTP_PEER_ADDR_THLDS
7160	*
7161	* This option allows us to fetch the partially failed threshold for one or all
7162	* transports in an association. See Section 6.1 of:
7163	* http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7164	*/
7165	static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7166	char __user *optval, int len,
7167	int __user *optlen, bool v2)
7168	{
7169	struct sctp_paddrthlds_v2 val;
7170	struct sctp_transport *trans;
7171	struct sctp_association *asoc;
7172	int min;
7173
7174	min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7175	if (len < min)
7176	return -EINVAL;
7177	len = min;
7178	if (copy_from_user(to: &val, from: optval, n: len))
7179	return -EFAULT;
7180
7181	if (!sctp_is_any(sk, addr: (const union sctp_addr *)&val.spt_address)) {
7182	trans = sctp_addr_id2transport(sk, addr: &val.spt_address,
7183	id: val.spt_assoc_id);
7184	if (!trans)
7185	return -ENOENT;
7186
7187	val.spt_pathmaxrxt = trans->pathmaxrxt;
7188	val.spt_pathpfthld = trans->pf_retrans;
7189	val.spt_pathcpthld = trans->ps_retrans;
7190
7191	goto out;
7192	}
7193
7194	asoc = sctp_id2assoc(sk, id: val.spt_assoc_id);
7195	if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7196	sctp_style(sk, UDP))
7197	return -EINVAL;
7198
7199	if (asoc) {
7200	val.spt_pathpfthld = asoc->pf_retrans;
7201	val.spt_pathmaxrxt = asoc->pathmaxrxt;
7202	val.spt_pathcpthld = asoc->ps_retrans;
7203	} else {
7204	struct sctp_sock *sp = sctp_sk(sk);
7205
7206	val.spt_pathpfthld = sp->pf_retrans;
7207	val.spt_pathmaxrxt = sp->pathmaxrxt;
7208	val.spt_pathcpthld = sp->ps_retrans;
7209	}
7210
7211	out:
7212	if (put_user(len, optlen) || copy_to_user(to: optval, from: &val, n: len))
7213	return -EFAULT;
7214
7215	return 0;
7216	}
7217
7218	/*
7219	* SCTP_GET_ASSOC_STATS
7220	*
7221	* This option retrieves local per endpoint statistics. It is modeled
7222	* after OpenSolaris' implementation
7223	*/
7224	static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7225	char __user *optval,
7226	int __user *optlen)
7227	{
7228	struct sctp_assoc_stats sas;
7229	struct sctp_association *asoc = NULL;
7230
7231	/* User must provide at least the assoc id */
7232	if (len < sizeof(sctp_assoc_t))
7233	return -EINVAL;
7234
7235	/* Allow the struct to grow and fill in as much as possible */
7236	len = min_t(size_t, len, sizeof(sas));
7237
7238	if (copy_from_user(to: &sas, from: optval, n: len))
7239	return -EFAULT;
7240
7241	asoc = sctp_id2assoc(sk, id: sas.sas_assoc_id);
7242	if (!asoc)
7243	return -EINVAL;
7244
7245	sas.sas_rtxchunks = asoc->stats.rtxchunks;
7246	sas.sas_gapcnt = asoc->stats.gapcnt;
7247	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7248	sas.sas_osacks = asoc->stats.osacks;
7249	sas.sas_isacks = asoc->stats.isacks;
7250	sas.sas_octrlchunks = asoc->stats.octrlchunks;
7251	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7252	sas.sas_oodchunks = asoc->stats.oodchunks;
7253	sas.sas_iodchunks = asoc->stats.iodchunks;
7254	sas.sas_ouodchunks = asoc->stats.ouodchunks;
7255	sas.sas_iuodchunks = asoc->stats.iuodchunks;
7256	sas.sas_idupchunks = asoc->stats.idupchunks;
7257	sas.sas_opackets = asoc->stats.opackets;
7258	sas.sas_ipackets = asoc->stats.ipackets;
7259
7260	/* New high max rto observed, will return 0 if not a single
7261	* RTO update took place. obs_rto_ipaddr will be bogus
7262	* in such a case
7263	*/
7264	sas.sas_maxrto = asoc->stats.max_obs_rto;
7265	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7266	sizeof(struct sockaddr_storage));
7267
7268	/* Mark beginning of a new observation period */
7269	asoc->stats.max_obs_rto = asoc->rto_min;
7270
7271	if (put_user(len, optlen))
7272	return -EFAULT;
7273
7274	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7275
7276	if (copy_to_user(to: optval, from: &sas, n: len))
7277	return -EFAULT;
7278
7279	return 0;
7280	}
7281
7282	static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7283	char __user *optval,
7284	int __user *optlen)
7285	{
7286	int val = 0;
7287
7288	if (len < sizeof(int))
7289	return -EINVAL;
7290
7291	len = sizeof(int);
7292	if (sctp_sk(sk)->recvrcvinfo)
7293	val = 1;
7294	if (put_user(len, optlen))
7295	return -EFAULT;
7296	if (copy_to_user(to: optval, from: &val, n: len))
7297	return -EFAULT;
7298
7299	return 0;
7300	}
7301
7302	static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7303	char __user *optval,
7304	int __user *optlen)
7305	{
7306	int val = 0;
7307
7308	if (len < sizeof(int))
7309	return -EINVAL;
7310
7311	len = sizeof(int);
7312	if (sctp_sk(sk)->recvnxtinfo)
7313	val = 1;
7314	if (put_user(len, optlen))
7315	return -EFAULT;
7316	if (copy_to_user(to: optval, from: &val, n: len))
7317	return -EFAULT;
7318
7319	return 0;
7320	}
7321
7322	static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7323	char __user *optval,
7324	int __user *optlen)
7325	{
7326	struct sctp_assoc_value params;
7327	struct sctp_association *asoc;
7328	int retval = -EFAULT;
7329
7330	if (len < sizeof(params)) {
7331	retval = -EINVAL;
7332	goto out;
7333	}
7334
7335	len = sizeof(params);
7336	if (copy_from_user(to: &params, from: optval, n: len))
7337	goto out;
7338
7339	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7340	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7341	sctp_style(sk, UDP)) {
7342	retval = -EINVAL;
7343	goto out;
7344	}
7345
7346	params.assoc_value = asoc ? asoc->peer.prsctp_capable
7347	: sctp_sk(sk)->ep->prsctp_enable;
7348
7349	if (put_user(len, optlen))
7350	goto out;
7351
7352	if (copy_to_user(to: optval, from: &params, n: len))
7353	goto out;
7354
7355	retval = 0;
7356
7357	out:
7358	return retval;
7359	}
7360
7361	static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7362	char __user *optval,
7363	int __user *optlen)
7364	{
7365	struct sctp_default_prinfo info;
7366	struct sctp_association *asoc;
7367	int retval = -EFAULT;
7368
7369	if (len < sizeof(info)) {
7370	retval = -EINVAL;
7371	goto out;
7372	}
7373
7374	len = sizeof(info);
7375	if (copy_from_user(to: &info, from: optval, n: len))
7376	goto out;
7377
7378	asoc = sctp_id2assoc(sk, id: info.pr_assoc_id);
7379	if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7380	sctp_style(sk, UDP)) {
7381	retval = -EINVAL;
7382	goto out;
7383	}
7384
7385	if (asoc) {
7386	info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7387	info.pr_value = asoc->default_timetolive;
7388	} else {
7389	struct sctp_sock *sp = sctp_sk(sk);
7390
7391	info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7392	info.pr_value = sp->default_timetolive;
7393	}
7394
7395	if (put_user(len, optlen))
7396	goto out;
7397
7398	if (copy_to_user(to: optval, from: &info, n: len))
7399	goto out;
7400
7401	retval = 0;
7402
7403	out:
7404	return retval;
7405	}
7406
7407	static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7408	char __user *optval,
7409	int __user *optlen)
7410	{
7411	struct sctp_prstatus params;
7412	struct sctp_association *asoc;
7413	int policy;
7414	int retval = -EINVAL;
7415
7416	if (len < sizeof(params))
7417	goto out;
7418
7419	len = sizeof(params);
7420	if (copy_from_user(to: &params, from: optval, n: len)) {
7421	retval = -EFAULT;
7422	goto out;
7423	}
7424
7425	policy = params.sprstat_policy;
7426	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7427	((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7428	goto out;
7429
7430	asoc = sctp_id2assoc(sk, id: params.sprstat_assoc_id);
7431	if (!asoc)
7432	goto out;
7433
7434	if (policy == SCTP_PR_SCTP_ALL) {
7435	params.sprstat_abandoned_unsent = 0;
7436	params.sprstat_abandoned_sent = 0;
7437	for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7438	params.sprstat_abandoned_unsent +=
7439	asoc->abandoned_unsent[policy];
7440	params.sprstat_abandoned_sent +=
7441	asoc->abandoned_sent[policy];
7442	}
7443	} else {
7444	params.sprstat_abandoned_unsent =
7445	asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7446	params.sprstat_abandoned_sent =
7447	asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7448	}
7449
7450	if (put_user(len, optlen)) {
7451	retval = -EFAULT;
7452	goto out;
7453	}
7454
7455	if (copy_to_user(to: optval, from: &params, n: len)) {
7456	retval = -EFAULT;
7457	goto out;
7458	}
7459
7460	retval = 0;
7461
7462	out:
7463	return retval;
7464	}
7465
7466	static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7467	char __user *optval,
7468	int __user *optlen)
7469	{
7470	struct sctp_stream_out_ext *streamoute;
7471	struct sctp_association *asoc;
7472	struct sctp_prstatus params;
7473	int retval = -EINVAL;
7474	int policy;
7475
7476	if (len < sizeof(params))
7477	goto out;
7478
7479	len = sizeof(params);
7480	if (copy_from_user(to: &params, from: optval, n: len)) {
7481	retval = -EFAULT;
7482	goto out;
7483	}
7484
7485	policy = params.sprstat_policy;
7486	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7487	((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7488	goto out;
7489
7490	asoc = sctp_id2assoc(sk, id: params.sprstat_assoc_id);
7491	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7492	goto out;
7493
7494	streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7495	if (!streamoute) {
7496	/* Not allocated yet, means all stats are 0 */
7497	params.sprstat_abandoned_unsent = 0;
7498	params.sprstat_abandoned_sent = 0;
7499	retval = 0;
7500	goto out;
7501	}
7502
7503	if (policy == SCTP_PR_SCTP_ALL) {
7504	params.sprstat_abandoned_unsent = 0;
7505	params.sprstat_abandoned_sent = 0;
7506	for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7507	params.sprstat_abandoned_unsent +=
7508	streamoute->abandoned_unsent[policy];
7509	params.sprstat_abandoned_sent +=
7510	streamoute->abandoned_sent[policy];
7511	}
7512	} else {
7513	params.sprstat_abandoned_unsent =
7514	streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7515	params.sprstat_abandoned_sent =
7516	streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7517	}
7518
7519	if (put_user(len, optlen) || copy_to_user(to: optval, from: &params, n: len)) {
7520	retval = -EFAULT;
7521	goto out;
7522	}
7523
7524	retval = 0;
7525
7526	out:
7527	return retval;
7528	}
7529
7530	static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7531	char __user *optval,
7532	int __user *optlen)
7533	{
7534	struct sctp_assoc_value params;
7535	struct sctp_association *asoc;
7536	int retval = -EFAULT;
7537
7538	if (len < sizeof(params)) {
7539	retval = -EINVAL;
7540	goto out;
7541	}
7542
7543	len = sizeof(params);
7544	if (copy_from_user(to: &params, from: optval, n: len))
7545	goto out;
7546
7547	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7548	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7549	sctp_style(sk, UDP)) {
7550	retval = -EINVAL;
7551	goto out;
7552	}
7553
7554	params.assoc_value = asoc ? asoc->peer.reconf_capable
7555	: sctp_sk(sk)->ep->reconf_enable;
7556
7557	if (put_user(len, optlen))
7558	goto out;
7559
7560	if (copy_to_user(to: optval, from: &params, n: len))
7561	goto out;
7562
7563	retval = 0;
7564
7565	out:
7566	return retval;
7567	}
7568
7569	static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7570	char __user *optval,
7571	int __user *optlen)
7572	{
7573	struct sctp_assoc_value params;
7574	struct sctp_association *asoc;
7575	int retval = -EFAULT;
7576
7577	if (len < sizeof(params)) {
7578	retval = -EINVAL;
7579	goto out;
7580	}
7581
7582	len = sizeof(params);
7583	if (copy_from_user(to: &params, from: optval, n: len))
7584	goto out;
7585
7586	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7587	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7588	sctp_style(sk, UDP)) {
7589	retval = -EINVAL;
7590	goto out;
7591	}
7592
7593	params.assoc_value = asoc ? asoc->strreset_enable
7594	: sctp_sk(sk)->ep->strreset_enable;
7595
7596	if (put_user(len, optlen))
7597	goto out;
7598
7599	if (copy_to_user(to: optval, from: &params, n: len))
7600	goto out;
7601
7602	retval = 0;
7603
7604	out:
7605	return retval;
7606	}
7607
7608	static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7609	char __user *optval,
7610	int __user *optlen)
7611	{
7612	struct sctp_assoc_value params;
7613	struct sctp_association *asoc;
7614	int retval = -EFAULT;
7615
7616	if (len < sizeof(params)) {
7617	retval = -EINVAL;
7618	goto out;
7619	}
7620
7621	len = sizeof(params);
7622	if (copy_from_user(to: &params, from: optval, n: len))
7623	goto out;
7624
7625	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7626	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7627	sctp_style(sk, UDP)) {
7628	retval = -EINVAL;
7629	goto out;
7630	}
7631
7632	params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7633	: sctp_sk(sk)->default_ss;
7634
7635	if (put_user(len, optlen))
7636	goto out;
7637
7638	if (copy_to_user(to: optval, from: &params, n: len))
7639	goto out;
7640
7641	retval = 0;
7642
7643	out:
7644	return retval;
7645	}
7646
7647	static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7648	char __user *optval,
7649	int __user *optlen)
7650	{
7651	struct sctp_stream_value params;
7652	struct sctp_association *asoc;
7653	int retval = -EFAULT;
7654
7655	if (len < sizeof(params)) {
7656	retval = -EINVAL;
7657	goto out;
7658	}
7659
7660	len = sizeof(params);
7661	if (copy_from_user(to: &params, from: optval, n: len))
7662	goto out;
7663
7664	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7665	if (!asoc) {
7666	retval = -EINVAL;
7667	goto out;
7668	}
7669
7670	retval = sctp_sched_get_value(asoc, sid: params.stream_id,
7671	value: &params.stream_value);
7672	if (retval)
7673	goto out;
7674
7675	if (put_user(len, optlen)) {
7676	retval = -EFAULT;
7677	goto out;
7678	}
7679
7680	if (copy_to_user(to: optval, from: &params, n: len)) {
7681	retval = -EFAULT;
7682	goto out;
7683	}
7684
7685	out:
7686	return retval;
7687	}
7688
7689	static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7690	char __user *optval,
7691	int __user *optlen)
7692	{
7693	struct sctp_assoc_value params;
7694	struct sctp_association *asoc;
7695	int retval = -EFAULT;
7696
7697	if (len < sizeof(params)) {
7698	retval = -EINVAL;
7699	goto out;
7700	}
7701
7702	len = sizeof(params);
7703	if (copy_from_user(to: &params, from: optval, n: len))
7704	goto out;
7705
7706	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7707	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7708	sctp_style(sk, UDP)) {
7709	retval = -EINVAL;
7710	goto out;
7711	}
7712
7713	params.assoc_value = asoc ? asoc->peer.intl_capable
7714	: sctp_sk(sk)->ep->intl_enable;
7715
7716	if (put_user(len, optlen))
7717	goto out;
7718
7719	if (copy_to_user(to: optval, from: &params, n: len))
7720	goto out;
7721
7722	retval = 0;
7723
7724	out:
7725	return retval;
7726	}
7727
7728	static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7729	char __user *optval,
7730	int __user *optlen)
7731	{
7732	int val;
7733
7734	if (len < sizeof(int))
7735	return -EINVAL;
7736
7737	len = sizeof(int);
7738	val = sctp_sk(sk)->reuse;
7739	if (put_user(len, optlen))
7740	return -EFAULT;
7741
7742	if (copy_to_user(to: optval, from: &val, n: len))
7743	return -EFAULT;
7744
7745	return 0;
7746	}
7747
7748	static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7749	int __user *optlen)
7750	{
7751	struct sctp_association *asoc;
7752	struct sctp_event param;
7753	__u16 subscribe;
7754
7755	if (len < sizeof(param))
7756	return -EINVAL;
7757
7758	len = sizeof(param);
7759	if (copy_from_user(to: &param, from: optval, n: len))
7760	return -EFAULT;
7761
7762	if (param.se_type < SCTP_SN_TYPE_BASE ||
7763	param.se_type > SCTP_SN_TYPE_MAX)
7764	return -EINVAL;
7765
7766	asoc = sctp_id2assoc(sk, id: param.se_assoc_id);
7767	if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7768	sctp_style(sk, UDP))
7769	return -EINVAL;
7770
7771	subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7772	param.se_on = sctp_ulpevent_type_enabled(subscribe, sn_type: param.se_type);
7773
7774	if (put_user(len, optlen))
7775	return -EFAULT;
7776
7777	if (copy_to_user(to: optval, from: &param, n: len))
7778	return -EFAULT;
7779
7780	return 0;
7781	}
7782
7783	static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7784	char __user *optval,
7785	int __user *optlen)
7786	{
7787	struct sctp_assoc_value params;
7788	struct sctp_association *asoc;
7789	int retval = -EFAULT;
7790
7791	if (len < sizeof(params)) {
7792	retval = -EINVAL;
7793	goto out;
7794	}
7795
7796	len = sizeof(params);
7797	if (copy_from_user(to: &params, from: optval, n: len))
7798	goto out;
7799
7800	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7801	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7802	sctp_style(sk, UDP)) {
7803	retval = -EINVAL;
7804	goto out;
7805	}
7806
7807	params.assoc_value = asoc ? asoc->peer.asconf_capable
7808	: sctp_sk(sk)->ep->asconf_enable;
7809
7810	if (put_user(len, optlen))
7811	goto out;
7812
7813	if (copy_to_user(to: optval, from: &params, n: len))
7814	goto out;
7815
7816	retval = 0;
7817
7818	out:
7819	return retval;
7820	}
7821
7822	static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7823	char __user *optval,
7824	int __user *optlen)
7825	{
7826	struct sctp_assoc_value params;
7827	struct sctp_association *asoc;
7828	int retval = -EFAULT;
7829
7830	if (len < sizeof(params)) {
7831	retval = -EINVAL;
7832	goto out;
7833	}
7834
7835	len = sizeof(params);
7836	if (copy_from_user(to: &params, from: optval, n: len))
7837	goto out;
7838
7839	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7840	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7841	sctp_style(sk, UDP)) {
7842	retval = -EINVAL;
7843	goto out;
7844	}
7845
7846	params.assoc_value = asoc ? asoc->peer.auth_capable
7847	: sctp_sk(sk)->ep->auth_enable;
7848
7849	if (put_user(len, optlen))
7850	goto out;
7851
7852	if (copy_to_user(to: optval, from: &params, n: len))
7853	goto out;
7854
7855	retval = 0;
7856
7857	out:
7858	return retval;
7859	}
7860
7861	static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7862	char __user *optval,
7863	int __user *optlen)
7864	{
7865	struct sctp_assoc_value params;
7866	struct sctp_association *asoc;
7867	int retval = -EFAULT;
7868
7869	if (len < sizeof(params)) {
7870	retval = -EINVAL;
7871	goto out;
7872	}
7873
7874	len = sizeof(params);
7875	if (copy_from_user(to: &params, from: optval, n: len))
7876	goto out;
7877
7878	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7879	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7880	sctp_style(sk, UDP)) {
7881	retval = -EINVAL;
7882	goto out;
7883	}
7884
7885	params.assoc_value = asoc ? asoc->peer.ecn_capable
7886	: sctp_sk(sk)->ep->ecn_enable;
7887
7888	if (put_user(len, optlen))
7889	goto out;
7890
7891	if (copy_to_user(to: optval, from: &params, n: len))
7892	goto out;
7893
7894	retval = 0;
7895
7896	out:
7897	return retval;
7898	}
7899
7900	static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7901	char __user *optval,
7902	int __user *optlen)
7903	{
7904	struct sctp_assoc_value params;
7905	struct sctp_association *asoc;
7906	int retval = -EFAULT;
7907
7908	if (len < sizeof(params)) {
7909	retval = -EINVAL;
7910	goto out;
7911	}
7912
7913	len = sizeof(params);
7914	if (copy_from_user(to: &params, from: optval, n: len))
7915	goto out;
7916
7917	asoc = sctp_id2assoc(sk, id: params.assoc_id);
7918	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7919	sctp_style(sk, UDP)) {
7920	retval = -EINVAL;
7921	goto out;
7922	}
7923
7924	params.assoc_value = asoc ? asoc->pf_expose
7925	: sctp_sk(sk)->pf_expose;
7926
7927	if (put_user(len, optlen))
7928	goto out;
7929
7930	if (copy_to_user(to: optval, from: &params, n: len))
7931	goto out;
7932
7933	retval = 0;
7934
7935	out:
7936	return retval;
7937	}
7938
7939	static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7940	char __user *optval, int __user *optlen)
7941	{
7942	struct sctp_association *asoc;
7943	struct sctp_udpencaps encap;
7944	struct sctp_transport *t;
7945	__be16 encap_port;
7946
7947	if (len < sizeof(encap))
7948	return -EINVAL;
7949
7950	len = sizeof(encap);
7951	if (copy_from_user(to: &encap, from: optval, n: len))
7952	return -EFAULT;
7953
7954	/* If an address other than INADDR_ANY is specified, and
7955	* no transport is found, then the request is invalid.
7956	*/
7957	if (!sctp_is_any(sk, addr: (union sctp_addr *)&encap.sue_address)) {
7958	t = sctp_addr_id2transport(sk, addr: &encap.sue_address,
7959	id: encap.sue_assoc_id);
7960	if (!t) {
7961	pr_debug("%s: failed no transport\n", __func__);
7962	return -EINVAL;
7963	}
7964
7965	encap_port = t->encap_port;
7966	goto out;
7967	}
7968
7969	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7970	* socket is a one to many style socket, and an association
7971	* was not found, then the id was invalid.
7972	*/
7973	asoc = sctp_id2assoc(sk, id: encap.sue_assoc_id);
7974	if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7975	sctp_style(sk, UDP)) {
7976	pr_debug("%s: failed no association\n", __func__);
7977	return -EINVAL;
7978	}
7979
7980	if (asoc) {
7981	encap_port = asoc->encap_port;
7982	goto out;
7983	}
7984
7985	encap_port = sctp_sk(sk)->encap_port;
7986
7987	out:
7988	encap.sue_port = (__force uint16_t)encap_port;
7989	if (copy_to_user(to: optval, from: &encap, n: len))
7990	return -EFAULT;
7991
7992	if (put_user(len, optlen))
7993	return -EFAULT;
7994
7995	return 0;
7996	}
7997
7998	static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
7999	char __user *optval,
8000	int __user *optlen)
8001	{
8002	struct sctp_probeinterval params;
8003	struct sctp_association *asoc;
8004	struct sctp_transport *t;
8005	__u32 probe_interval;
8006
8007	if (len < sizeof(params))
8008	return -EINVAL;
8009
8010	len = sizeof(params);
8011	if (copy_from_user(to: &params, from: optval, n: len))
8012	return -EFAULT;
8013
8014	/* If an address other than INADDR_ANY is specified, and
8015	* no transport is found, then the request is invalid.
8016	*/
8017	if (!sctp_is_any(sk, addr: (union sctp_addr *)&params.spi_address)) {
8018	t = sctp_addr_id2transport(sk, addr: &params.spi_address,
8019	id: params.spi_assoc_id);
8020	if (!t) {
8021	pr_debug("%s: failed no transport\n", __func__);
8022	return -EINVAL;
8023	}
8024
8025	probe_interval = jiffies_to_msecs(j: t->probe_interval);
8026	goto out;
8027	}
8028
8029	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8030	* socket is a one to many style socket, and an association
8031	* was not found, then the id was invalid.
8032	*/
8033	asoc = sctp_id2assoc(sk, id: params.spi_assoc_id);
8034	if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8035	sctp_style(sk, UDP)) {
8036	pr_debug("%s: failed no association\n", __func__);
8037	return -EINVAL;
8038	}
8039
8040	if (asoc) {
8041	probe_interval = jiffies_to_msecs(j: asoc->probe_interval);
8042	goto out;
8043	}
8044
8045	probe_interval = sctp_sk(sk)->probe_interval;
8046
8047	out:
8048	params.spi_interval = probe_interval;
8049	if (copy_to_user(to: optval, from: &params, n: len))
8050	return -EFAULT;
8051
8052	if (put_user(len, optlen))
8053	return -EFAULT;
8054
8055	return 0;
8056	}
8057
8058	static int sctp_getsockopt(struct sock *sk, int level, int optname,
8059	char __user *optval, int __user *optlen)
8060	{
8061	int retval = 0;
8062	int len;
8063
8064	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8065
8066	/* I can hardly begin to describe how wrong this is. This is
8067	* so broken as to be worse than useless. The API draft
8068	* REALLY is NOT helpful here... I am not convinced that the
8069	* semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8070	* are at all well-founded.
8071	*/
8072	if (level != SOL_SCTP) {
8073	struct sctp_af *af = sctp_sk(sk)->pf->af;
8074
8075	retval = af->getsockopt(sk, level, optname, optval, optlen);
8076	return retval;
8077	}
8078
8079	if (get_user(len, optlen))
8080	return -EFAULT;
8081
8082	if (len < 0)
8083	return -EINVAL;
8084
8085	lock_sock(sk);
8086
8087	switch (optname) {
8088	case SCTP_STATUS:
8089	retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8090	break;
8091	case SCTP_DISABLE_FRAGMENTS:
8092	retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8093	optlen);
8094	break;
8095	case SCTP_EVENTS:
8096	retval = sctp_getsockopt_events(sk, len, optval, optlen);
8097	break;
8098	case SCTP_AUTOCLOSE:
8099	retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8100	break;
8101	case SCTP_SOCKOPT_PEELOFF:
8102	retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8103	break;
8104	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8105	retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8106	break;
8107	case SCTP_PEER_ADDR_PARAMS:
8108	retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8109	optlen);
8110	break;
8111	case SCTP_DELAYED_SACK:
8112	retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8113	optlen);
8114	break;
8115	case SCTP_INITMSG:
8116	retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8117	break;
8118	case SCTP_GET_PEER_ADDRS:
8119	retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8120	optlen);
8121	break;
8122	case SCTP_GET_LOCAL_ADDRS:
8123	retval = sctp_getsockopt_local_addrs(sk, len, optval,
8124	optlen);
8125	break;
8126	case SCTP_SOCKOPT_CONNECTX3:
8127	retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8128	break;
8129	case SCTP_DEFAULT_SEND_PARAM:
8130	retval = sctp_getsockopt_default_send_param(sk, len,
8131	optval, optlen);
8132	break;
8133	case SCTP_DEFAULT_SNDINFO:
8134	retval = sctp_getsockopt_default_sndinfo(sk, len,
8135	optval, optlen);
8136	break;
8137	case SCTP_PRIMARY_ADDR:
8138	retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8139	break;
8140	case SCTP_NODELAY:
8141	retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8142	break;
8143	case SCTP_RTOINFO:
8144	retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8145	break;
8146	case SCTP_ASSOCINFO:
8147	retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8148	break;
8149	case SCTP_I_WANT_MAPPED_V4_ADDR:
8150	retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8151	break;
8152	case SCTP_MAXSEG:
8153	retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8154	break;
8155	case SCTP_GET_PEER_ADDR_INFO:
8156	retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8157	optlen);
8158	break;
8159	case SCTP_ADAPTATION_LAYER:
8160	retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8161	optlen);
8162	break;
8163	case SCTP_CONTEXT:
8164	retval = sctp_getsockopt_context(sk, len, optval, optlen);
8165	break;
8166	case SCTP_FRAGMENT_INTERLEAVE:
8167	retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8168	optlen);
8169	break;
8170	case SCTP_PARTIAL_DELIVERY_POINT:
8171	retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8172	optlen);
8173	break;
8174	case SCTP_MAX_BURST:
8175	retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8176	break;
8177	case SCTP_AUTH_KEY:
8178	case SCTP_AUTH_CHUNK:
8179	case SCTP_AUTH_DELETE_KEY:
8180	case SCTP_AUTH_DEACTIVATE_KEY:
8181	retval = -EOPNOTSUPP;
8182	break;
8183	case SCTP_HMAC_IDENT:
8184	retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8185	break;
8186	case SCTP_AUTH_ACTIVE_KEY:
8187	retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8188	break;
8189	case SCTP_PEER_AUTH_CHUNKS:
8190	retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8191	optlen);
8192	break;
8193	case SCTP_LOCAL_AUTH_CHUNKS:
8194	retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8195	optlen);
8196	break;
8197	case SCTP_GET_ASSOC_NUMBER:
8198	retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8199	break;
8200	case SCTP_GET_ASSOC_ID_LIST:
8201	retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8202	break;
8203	case SCTP_AUTO_ASCONF:
8204	retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8205	break;
8206	case SCTP_PEER_ADDR_THLDS:
8207	retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8208	optlen, v2: false);
8209	break;
8210	case SCTP_PEER_ADDR_THLDS_V2:
8211	retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8212	optlen, v2: true);
8213	break;
8214	case SCTP_GET_ASSOC_STATS:
8215	retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8216	break;
8217	case SCTP_RECVRCVINFO:
8218	retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8219	break;
8220	case SCTP_RECVNXTINFO:
8221	retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8222	break;
8223	case SCTP_PR_SUPPORTED:
8224	retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8225	break;
8226	case SCTP_DEFAULT_PRINFO:
8227	retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8228	optlen);
8229	break;
8230	case SCTP_PR_ASSOC_STATUS:
8231	retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8232	optlen);
8233	break;
8234	case SCTP_PR_STREAM_STATUS:
8235	retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8236	optlen);
8237	break;
8238	case SCTP_RECONFIG_SUPPORTED:
8239	retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8240	optlen);
8241	break;
8242	case SCTP_ENABLE_STREAM_RESET:
8243	retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8244	optlen);
8245	break;
8246	case SCTP_STREAM_SCHEDULER:
8247	retval = sctp_getsockopt_scheduler(sk, len, optval,
8248	optlen);
8249	break;
8250	case SCTP_STREAM_SCHEDULER_VALUE:
8251	retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8252	optlen);
8253	break;
8254	case SCTP_INTERLEAVING_SUPPORTED:
8255	retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8256	optlen);
8257	break;
8258	case SCTP_REUSE_PORT:
8259	retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8260	break;
8261	case SCTP_EVENT:
8262	retval = sctp_getsockopt_event(sk, len, optval, optlen);
8263	break;
8264	case SCTP_ASCONF_SUPPORTED:
8265	retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8266	optlen);
8267	break;
8268	case SCTP_AUTH_SUPPORTED:
8269	retval = sctp_getsockopt_auth_supported(sk, len, optval,
8270	optlen);
8271	break;
8272	case SCTP_ECN_SUPPORTED:
8273	retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8274	break;
8275	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8276	retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8277	break;
8278	case SCTP_REMOTE_UDP_ENCAPS_PORT:
8279	retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8280	break;
8281	case SCTP_PLPMTUD_PROBE_INTERVAL:
8282	retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8283	break;
8284	default:
8285	retval = -ENOPROTOOPT;
8286	break;
8287	}
8288
8289	release_sock(sk);
8290	return retval;
8291	}
8292
8293	static bool sctp_bpf_bypass_getsockopt(int level, int optname)
8294	{
8295	if (level == SOL_SCTP) {
8296	switch (optname) {
8297	case SCTP_SOCKOPT_PEELOFF:
8298	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8299	case SCTP_SOCKOPT_CONNECTX3:
8300	return true;
8301	default:
8302	return false;
8303	}
8304	}
8305
8306	return false;
8307	}
8308
8309	static int sctp_hash(struct sock *sk)
8310	{
8311	/* STUB */
8312	return 0;
8313	}
8314
8315	static void sctp_unhash(struct sock *sk)
8316	{
8317	/* STUB */
8318	}
8319
8320	/* Check if port is acceptable. Possibly find first available port.
8321	*
8322	* The port hash table (contained in the 'global' SCTP protocol storage
8323	* returned by struct sctp_protocol *sctp_get_protocol()). The hash
8324	* table is an array of 4096 lists (sctp_bind_hashbucket). Each
8325	* list (the list number is the port number hashed out, so as you
8326	* would expect from a hash function, all the ports in a given list have
8327	* such a number that hashes out to the same list number; you were
8328	* expecting that, right?); so each list has a set of ports, with a
8329	* link to the socket (struct sock) that uses it, the port number and
8330	* a fastreuse flag (FIXME: NPI ipg).
8331	*/
8332	static struct sctp_bind_bucket *sctp_bucket_create(
8333	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8334
8335	static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8336	{
8337	struct sctp_sock *sp = sctp_sk(sk);
8338	bool reuse = (sk->sk_reuse || sp->reuse);
8339	struct sctp_bind_hashbucket *head; /* hash list */
8340	struct net *net = sock_net(sk);
8341	kuid_t uid = sock_i_uid(sk);
8342	struct sctp_bind_bucket *pp;
8343	unsigned short snum;
8344	int ret;
8345
8346	snum = ntohs(addr->v4.sin_port);
8347
8348	pr_debug("%s: begins, snum:%d\n", __func__, snum);
8349
8350	if (snum == 0) {
8351	/* Search for an available port. */
8352	int low, high, remaining, index;
8353	unsigned int rover;
8354
8355	inet_sk_get_local_port_range(sk, low: &low, high: &high);
8356	remaining = (high - low) + 1;
8357	rover = get_random_u32_below(ceil: remaining) + low;
8358
8359	do {
8360	rover++;
8361	if ((rover < low) || (rover > high))
8362	rover = low;
8363	if (inet_is_local_reserved_port(net, port: rover))
8364	continue;
8365	index = sctp_phashfn(net, lport: rover);
8366	head = &sctp_port_hashtable[index];
8367	spin_lock_bh(lock: &head->lock);
8368	sctp_for_each_hentry(pp, &head->chain)
8369	if ((pp->port == rover) &&
8370	net_eq(net1: net, net2: pp->net))
8371	goto next;
8372	break;
8373	next:
8374	spin_unlock_bh(lock: &head->lock);
8375	cond_resched();
8376	} while (--remaining > 0);
8377
8378	/* Exhausted local port range during search? */
8379	ret = 1;
8380	if (remaining <= 0)
8381	return ret;
8382
8383	/* OK, here is the one we will use. HEAD (the port
8384	* hash table list entry) is non-NULL and we hold it's
8385	* mutex.
8386	*/
8387	snum = rover;
8388	} else {
8389	/* We are given an specific port number; we verify
8390	* that it is not being used. If it is used, we will
8391	* exahust the search in the hash list corresponding
8392	* to the port number (snum) - we detect that with the
8393	* port iterator, pp being NULL.
8394	*/
8395	head = &sctp_port_hashtable[sctp_phashfn(net, lport: snum)];
8396	spin_lock_bh(lock: &head->lock);
8397	sctp_for_each_hentry(pp, &head->chain) {
8398	if ((pp->port == snum) && net_eq(net1: pp->net, net2: net))
8399	goto pp_found;
8400	}
8401	}
8402	pp = NULL;
8403	goto pp_not_found;
8404	pp_found:
8405	if (!hlist_empty(h: &pp->owner)) {
8406	/* We had a port hash table hit - there is an
8407	* available port (pp != NULL) and it is being
8408	* used by other socket (pp->owner not empty); that other
8409	* socket is going to be sk2.
8410	*/
8411	struct sock *sk2;
8412
8413	pr_debug("%s: found a possible match\n", __func__);
8414
8415	if ((pp->fastreuse && reuse &&
8416	sk->sk_state != SCTP_SS_LISTENING) ||
8417	(pp->fastreuseport && sk->sk_reuseport &&
8418	uid_eq(left: pp->fastuid, right: uid)))
8419	goto success;
8420
8421	/* Run through the list of sockets bound to the port
8422	* (pp->port) [via the pointers bind_next and
8423	* bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8424	* we get the endpoint they describe and run through
8425	* the endpoint's list of IP (v4 or v6) addresses,
8426	* comparing each of the addresses with the address of
8427	* the socket sk. If we find a match, then that means
8428	* that this port/socket (sk) combination are already
8429	* in an endpoint.
8430	*/
8431	sk_for_each_bound(sk2, &pp->owner) {
8432	int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
8433	struct sctp_sock *sp2 = sctp_sk(sk2);
8434	struct sctp_endpoint *ep2 = sp2->ep;
8435
8436	if (sk == sk2 ||
8437	(reuse && (sk2->sk_reuse || sp2->reuse) &&
8438	sk2->sk_state != SCTP_SS_LISTENING) ||
8439	(sk->sk_reuseport && sk2->sk_reuseport &&
8440	uid_eq(left: uid, right: sock_i_uid(sk: sk2))))
8441	continue;
8442
8443	if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
8444	sk->sk_bound_dev_if == bound_dev_if2) &&
8445	sctp_bind_addr_conflict(&ep2->base.bind_addr,
8446	addr, sp2, sp)) {
8447	ret = 1;
8448	goto fail_unlock;
8449	}
8450	}
8451
8452	pr_debug("%s: found a match\n", __func__);
8453	}
8454	pp_not_found:
8455	/* If there was a hash table miss, create a new port. */
8456	ret = 1;
8457	if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8458	goto fail_unlock;
8459
8460	/* In either case (hit or miss), make sure fastreuse is 1 only
8461	* if sk->sk_reuse is too (that is, if the caller requested
8462	* SO_REUSEADDR on this socket -sk-).
8463	*/
8464	if (hlist_empty(h: &pp->owner)) {
8465	if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8466	pp->fastreuse = 1;
8467	else
8468	pp->fastreuse = 0;
8469
8470	if (sk->sk_reuseport) {
8471	pp->fastreuseport = 1;
8472	pp->fastuid = uid;
8473	} else {
8474	pp->fastreuseport = 0;
8475	}
8476	} else {
8477	if (pp->fastreuse &&
8478	(!reuse || sk->sk_state == SCTP_SS_LISTENING))
8479	pp->fastreuse = 0;
8480
8481	if (pp->fastreuseport &&
8482	(!sk->sk_reuseport || !uid_eq(left: pp->fastuid, right: uid)))
8483	pp->fastreuseport = 0;
8484	}
8485
8486	/* We are set, so fill up all the data in the hash table
8487	* entry, tie the socket list information with the rest of the
8488	* sockets FIXME: Blurry, NPI (ipg).
8489	*/
8490	success:
8491	if (!sp->bind_hash) {
8492	inet_sk(sk)->inet_num = snum;
8493	sk_add_bind_node(sk, list: &pp->owner);
8494	sp->bind_hash = pp;
8495	}
8496	ret = 0;
8497
8498	fail_unlock:
8499	spin_unlock_bh(lock: &head->lock);
8500	return ret;
8501	}
8502
8503	/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8504	* port is requested.
8505	*/
8506	static int sctp_get_port(struct sock *sk, unsigned short snum)
8507	{
8508	union sctp_addr addr;
8509	struct sctp_af *af = sctp_sk(sk)->pf->af;
8510
8511	/* Set up a dummy address struct from the sk. */
8512	af->from_sk(&addr, sk);
8513	addr.v4.sin_port = htons(snum);
8514
8515	/* Note: sk->sk_num gets filled in if ephemeral port request. */
8516	return sctp_get_port_local(sk, addr: &addr);
8517	}
8518
8519	/*
8520	* Move a socket to LISTENING state.
8521	*/
8522	static int sctp_listen_start(struct sock *sk, int backlog)
8523	{
8524	struct sctp_sock *sp = sctp_sk(sk);
8525	struct sctp_endpoint *ep = sp->ep;
8526	struct crypto_shash *tfm = NULL;
8527	char alg[32];
8528
8529	/* Allocate HMAC for generating cookie. */
8530	if (!sp->hmac && sp->sctp_hmac_alg) {
8531	sprintf(buf: alg, fmt: "hmac(%s)", sp->sctp_hmac_alg);
8532	tfm = crypto_alloc_shash(alg_name: alg, type: 0, mask: 0);
8533	if (IS_ERR(ptr: tfm)) {
8534	net_info_ratelimited("failed to load transform for %s: %ld\n",
8535	sp->sctp_hmac_alg, PTR_ERR(tfm));
8536	return -ENOSYS;
8537	}
8538	sctp_sk(sk)->hmac = tfm;
8539	}
8540
8541	/*
8542	* If a bind() or sctp_bindx() is not called prior to a listen()
8543	* call that allows new associations to be accepted, the system
8544	* picks an ephemeral port and will choose an address set equivalent
8545	* to binding with a wildcard address.
8546	*
8547	* This is not currently spelled out in the SCTP sockets
8548	* extensions draft, but follows the practice as seen in TCP
8549	* sockets.
8550	*
8551	*/
8552	inet_sk_set_state(sk, state: SCTP_SS_LISTENING);
8553	if (!ep->base.bind_addr.port) {
8554	if (sctp_autobind(sk))
8555	return -EAGAIN;
8556	} else {
8557	if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8558	inet_sk_set_state(sk, state: SCTP_SS_CLOSED);
8559	return -EADDRINUSE;
8560	}
8561	}
8562
8563	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8564	return sctp_hash_endpoint(ep);
8565	}
8566
8567	/*
8568	* 4.1.3 / 5.1.3 listen()
8569	*
8570	* By default, new associations are not accepted for UDP style sockets.
8571	* An application uses listen() to mark a socket as being able to
8572	* accept new associations.
8573	*
8574	* On TCP style sockets, applications use listen() to ready the SCTP
8575	* endpoint for accepting inbound associations.
8576	*
8577	* On both types of endpoints a backlog of '0' disables listening.
8578	*
8579	* Move a socket to LISTENING state.
8580	*/
8581	int sctp_inet_listen(struct socket *sock, int backlog)
8582	{
8583	struct sock *sk = sock->sk;
8584	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8585	int err = -EINVAL;
8586
8587	if (unlikely(backlog < 0))
8588	return err;
8589
8590	lock_sock(sk);
8591
8592	/* Peeled-off sockets are not allowed to listen(). */
8593	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8594	goto out;
8595
8596	if (sock->state != SS_UNCONNECTED)
8597	goto out;
8598
8599	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8600	goto out;
8601
8602	/* If backlog is zero, disable listening. */
8603	if (!backlog) {
8604	if (sctp_sstate(sk, CLOSED))
8605	goto out;
8606
8607	err = 0;
8608	sctp_unhash_endpoint(ep);
8609	sk->sk_state = SCTP_SS_CLOSED;
8610	if (sk->sk_reuse || sctp_sk(sk)->reuse)
8611	sctp_sk(sk)->bind_hash->fastreuse = 1;
8612	goto out;
8613	}
8614
8615	/* If we are already listening, just update the backlog */
8616	if (sctp_sstate(sk, LISTENING))
8617	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8618	else {
8619	err = sctp_listen_start(sk, backlog);
8620	if (err)
8621	goto out;
8622	}
8623
8624	err = 0;
8625	out:
8626	release_sock(sk);
8627	return err;
8628	}
8629
8630	/*
8631	* This function is done by modeling the current datagram_poll() and the
8632	* tcp_poll(). Note that, based on these implementations, we don't
8633	* lock the socket in this function, even though it seems that,
8634	* ideally, locking or some other mechanisms can be used to ensure
8635	* the integrity of the counters (sndbuf and wmem_alloc) used
8636	* in this place. We assume that we don't need locks either until proven
8637	* otherwise.
8638	*
8639	* Another thing to note is that we include the Async I/O support
8640	* here, again, by modeling the current TCP/UDP code. We don't have
8641	* a good way to test with it yet.
8642	*/
8643	__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8644	{
8645	struct sock *sk = sock->sk;
8646	struct sctp_sock *sp = sctp_sk(sk);
8647	__poll_t mask;
8648
8649	poll_wait(filp: file, wait_address: sk_sleep(sk), p: wait);
8650
8651	sock_rps_record_flow(sk);
8652
8653	/* A TCP-style listening socket becomes readable when the accept queue
8654	* is not empty.
8655	*/
8656	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8657	return (!list_empty(head: &sp->ep->asocs)) ?
8658	(EPOLLIN | EPOLLRDNORM) : 0;
8659
8660	mask = 0;
8661
8662	/* Is there any exceptional events? */
8663	if (sk->sk_err || !skb_queue_empty_lockless(list: &sk->sk_error_queue))
8664	mask |= EPOLLERR |
8665	(sock_flag(sk, flag: SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8666	if (sk->sk_shutdown & RCV_SHUTDOWN)
8667	mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8668	if (sk->sk_shutdown == SHUTDOWN_MASK)
8669	mask |= EPOLLHUP;
8670
8671	/* Is it readable? Reconsider this code with TCP-style support. */
8672	if (!skb_queue_empty_lockless(list: &sk->sk_receive_queue))
8673	mask |= EPOLLIN | EPOLLRDNORM;
8674
8675	/* The association is either gone or not ready. */
8676	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8677	return mask;
8678
8679	/* Is it writable? */
8680	if (sctp_writeable(sk)) {
8681	mask |= EPOLLOUT | EPOLLWRNORM;
8682	} else {
8683	sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8684	/*
8685	* Since the socket is not locked, the buffer
8686	* might be made available after the writeable check and
8687	* before the bit is set. This could cause a lost I/O
8688	* signal. tcp_poll() has a race breaker for this race
8689	* condition. Based on their implementation, we put
8690	* in the following code to cover it as well.
8691	*/
8692	if (sctp_writeable(sk))
8693	mask |= EPOLLOUT | EPOLLWRNORM;
8694	}
8695	return mask;
8696	}
8697
8698	/********************************************************************
8699	* 2nd Level Abstractions
8700	********************************************************************/
8701
8702	static struct sctp_bind_bucket *sctp_bucket_create(
8703	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8704	{
8705	struct sctp_bind_bucket *pp;
8706
8707	pp = kmem_cache_alloc(cachep: sctp_bucket_cachep, GFP_ATOMIC);
8708	if (pp) {
8709	SCTP_DBG_OBJCNT_INC(bind_bucket);
8710	pp->port = snum;
8711	pp->fastreuse = 0;
8712	INIT_HLIST_HEAD(&pp->owner);
8713	pp->net = net;
8714	hlist_add_head(n: &pp->node, h: &head->chain);
8715	}
8716	return pp;
8717	}
8718
8719	/* Caller must hold hashbucket lock for this tb with local BH disabled */
8720	static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8721	{
8722	if (pp && hlist_empty(h: &pp->owner)) {
8723	__hlist_del(n: &pp->node);
8724	kmem_cache_free(s: sctp_bucket_cachep, objp: pp);
8725	SCTP_DBG_OBJCNT_DEC(bind_bucket);
8726	}
8727	}
8728
8729	/* Release this socket's reference to a local port. */
8730	static inline void __sctp_put_port(struct sock *sk)
8731	{
8732	struct sctp_bind_hashbucket *head =
8733	&sctp_port_hashtable[sctp_phashfn(net: sock_net(sk),
8734	inet_sk(sk)->inet_num)];
8735	struct sctp_bind_bucket *pp;
8736
8737	spin_lock(lock: &head->lock);
8738	pp = sctp_sk(sk)->bind_hash;
8739	__sk_del_bind_node(sk);
8740	sctp_sk(sk)->bind_hash = NULL;
8741	inet_sk(sk)->inet_num = 0;
8742	sctp_bucket_destroy(pp);
8743	spin_unlock(lock: &head->lock);
8744	}
8745
8746	void sctp_put_port(struct sock *sk)
8747	{
8748	local_bh_disable();
8749	__sctp_put_port(sk);
8750	local_bh_enable();
8751	}
8752
8753	/*
8754	* The system picks an ephemeral port and choose an address set equivalent
8755	* to binding with a wildcard address.
8756	* One of those addresses will be the primary address for the association.
8757	* This automatically enables the multihoming capability of SCTP.
8758	*/
8759	static int sctp_autobind(struct sock *sk)
8760	{
8761	union sctp_addr autoaddr;
8762	struct sctp_af *af;
8763	__be16 port;
8764
8765	/* Initialize a local sockaddr structure to INADDR_ANY. */
8766	af = sctp_sk(sk)->pf->af;
8767
8768	port = htons(inet_sk(sk)->inet_num);
8769	af->inaddr_any(&autoaddr, port);
8770
8771	return sctp_do_bind(sk, addr: &autoaddr, len: af->sockaddr_len);
8772	}
8773
8774	/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8775	*
8776	* From RFC 2292
8777	* 4.2 The cmsghdr Structure *
8778	*
8779	* When ancillary data is sent or received, any number of ancillary data
8780	* objects can be specified by the msg_control and msg_controllen members of
8781	* the msghdr structure, because each object is preceded by
8782	* a cmsghdr structure defining the object's length (the cmsg_len member).
8783	* Historically Berkeley-derived implementations have passed only one object
8784	* at a time, but this API allows multiple objects to be
8785	* passed in a single call to sendmsg() or recvmsg(). The following example
8786	* shows two ancillary data objects in a control buffer.
8787	*
8788	* |<--------------------------- msg_controllen -------------------------->|
8789	* | |
8790	*
8791	* |<----- ancillary data object ----->|<----- ancillary data object ----->|
8792	*
8793	* |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8794	* | | |
8795	*
8796	* |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8797	*
8798	* |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8799	* | | | | |
8800	*
8801	* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8802	* |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8803	*
8804	* |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8805	*
8806	* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8807	* ^
8808	* |
8809	*
8810	* msg_control
8811	* points here
8812	*/
8813	static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8814	{
8815	struct msghdr *my_msg = (struct msghdr *)msg;
8816	struct cmsghdr *cmsg;
8817
8818	for_each_cmsghdr(cmsg, my_msg) {
8819	if (!CMSG_OK(my_msg, cmsg))
8820	return -EINVAL;
8821
8822	/* Should we parse this header or ignore? */
8823	if (cmsg->cmsg_level != IPPROTO_SCTP)
8824	continue;
8825
8826	/* Strictly check lengths following example in SCM code. */
8827	switch (cmsg->cmsg_type) {
8828	case SCTP_INIT:
8829	/* SCTP Socket API Extension
8830	* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8831	*
8832	* This cmsghdr structure provides information for
8833	* initializing new SCTP associations with sendmsg().
8834	* The SCTP_INITMSG socket option uses this same data
8835	* structure. This structure is not used for
8836	* recvmsg().
8837	*
8838	* cmsg_level cmsg_type cmsg_data[]
8839	* ------------ ------------ ----------------------
8840	* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8841	*/
8842	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8843	return -EINVAL;
8844
8845	cmsgs->init = CMSG_DATA(cmsg);
8846	break;
8847
8848	case SCTP_SNDRCV:
8849	/* SCTP Socket API Extension
8850	* 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8851	*
8852	* This cmsghdr structure specifies SCTP options for
8853	* sendmsg() and describes SCTP header information
8854	* about a received message through recvmsg().
8855	*
8856	* cmsg_level cmsg_type cmsg_data[]
8857	* ------------ ------------ ----------------------
8858	* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8859	*/
8860	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8861	return -EINVAL;
8862
8863	cmsgs->srinfo = CMSG_DATA(cmsg);
8864
8865	if (cmsgs->srinfo->sinfo_flags &
8866	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8867	SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8868	SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8869	return -EINVAL;
8870	break;
8871
8872	case SCTP_SNDINFO:
8873	/* SCTP Socket API Extension
8874	* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8875	*
8876	* This cmsghdr structure specifies SCTP options for
8877	* sendmsg(). This structure and SCTP_RCVINFO replaces
8878	* SCTP_SNDRCV which has been deprecated.
8879	*
8880	* cmsg_level cmsg_type cmsg_data[]
8881	* ------------ ------------ ---------------------
8882	* IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8883	*/
8884	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8885	return -EINVAL;
8886
8887	cmsgs->sinfo = CMSG_DATA(cmsg);
8888
8889	if (cmsgs->sinfo->snd_flags &
8890	~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8891	SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8892	SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8893	return -EINVAL;
8894	break;
8895	case SCTP_PRINFO:
8896	/* SCTP Socket API Extension
8897	* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8898	*
8899	* This cmsghdr structure specifies SCTP options for sendmsg().
8900	*
8901	* cmsg_level cmsg_type cmsg_data[]
8902	* ------------ ------------ ---------------------
8903	* IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8904	*/
8905	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8906	return -EINVAL;
8907
8908	cmsgs->prinfo = CMSG_DATA(cmsg);
8909	if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8910	return -EINVAL;
8911
8912	if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8913	cmsgs->prinfo->pr_value = 0;
8914	break;
8915	case SCTP_AUTHINFO:
8916	/* SCTP Socket API Extension
8917	* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8918	*
8919	* This cmsghdr structure specifies SCTP options for sendmsg().
8920	*
8921	* cmsg_level cmsg_type cmsg_data[]
8922	* ------------ ------------ ---------------------
8923	* IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8924	*/
8925	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8926	return -EINVAL;
8927
8928	cmsgs->authinfo = CMSG_DATA(cmsg);
8929	break;
8930	case SCTP_DSTADDRV4:
8931	case SCTP_DSTADDRV6:
8932	/* SCTP Socket API Extension
8933	* 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8934	*
8935	* This cmsghdr structure specifies SCTP options for sendmsg().
8936	*
8937	* cmsg_level cmsg_type cmsg_data[]
8938	* ------------ ------------ ---------------------
8939	* IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8940	* ------------ ------------ ---------------------
8941	* IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8942	*/
8943	cmsgs->addrs_msg = my_msg;
8944	break;
8945	default:
8946	return -EINVAL;
8947	}
8948	}
8949
8950	return 0;
8951	}
8952
8953	/*
8954	* Wait for a packet..
8955	* Note: This function is the same function as in core/datagram.c
8956	* with a few modifications to make lksctp work.
8957	*/
8958	static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8959	{
8960	int error;
8961	DEFINE_WAIT(wait);
8962
8963	prepare_to_wait_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait, TASK_INTERRUPTIBLE);
8964
8965	/* Socket errors? */
8966	error = sock_error(sk);
8967	if (error)
8968	goto out;
8969
8970	if (!skb_queue_empty(list: &sk->sk_receive_queue))
8971	goto ready;
8972
8973	/* Socket shut down? */
8974	if (sk->sk_shutdown & RCV_SHUTDOWN)
8975	goto out;
8976
8977	/* Sequenced packets can come disconnected. If so we report the
8978	* problem.
8979	*/
8980	error = -ENOTCONN;
8981
8982	/* Is there a good reason to think that we may receive some data? */
8983	if (list_empty(head: &sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8984	goto out;
8985
8986	/* Handle signals. */
8987	if (signal_pending(current))
8988	goto interrupted;
8989
8990	/* Let another process have a go. Since we are going to sleep
8991	* anyway. Note: This may cause odd behaviors if the message
8992	* does not fit in the user's buffer, but this seems to be the
8993	* only way to honor MSG_DONTWAIT realistically.
8994	*/
8995	release_sock(sk);
8996	*timeo_p = schedule_timeout(timeout: *timeo_p);
8997	lock_sock(sk);
8998
8999	ready:
9000	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9001	return 0;
9002
9003	interrupted:
9004	error = sock_intr_errno(timeo: *timeo_p);
9005
9006	out:
9007	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9008	*err = error;
9009	return error;
9010	}
9011
9012	/* Receive a datagram.
9013	* Note: This is pretty much the same routine as in core/datagram.c
9014	* with a few changes to make lksctp work.
9015	*/
9016	struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
9017	{
9018	int error;
9019	struct sk_buff *skb;
9020	long timeo;
9021
9022	timeo = sock_rcvtimeo(sk, noblock: flags & MSG_DONTWAIT);
9023
9024	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
9025	MAX_SCHEDULE_TIMEOUT);
9026
9027	do {
9028	/* Again only user level code calls this function,
9029	* so nothing interrupt level
9030	* will suddenly eat the receive_queue.
9031	*
9032	* Look at current nfs client by the way...
9033	* However, this function was correct in any case. 8)
9034	*/
9035	if (flags & MSG_PEEK) {
9036	skb = skb_peek(list_: &sk->sk_receive_queue);
9037	if (skb)
9038	refcount_inc(r: &skb->users);
9039	} else {
9040	skb = __skb_dequeue(list: &sk->sk_receive_queue);
9041	}
9042
9043	if (skb)
9044	return skb;
9045
9046	/* Caller is allowed not to check sk->sk_err before calling. */
9047	error = sock_error(sk);
9048	if (error)
9049	goto no_packet;
9050
9051	if (sk->sk_shutdown & RCV_SHUTDOWN)
9052	break;
9053
9054
9055	/* User doesn't want to wait. */
9056	error = -EAGAIN;
9057	if (!timeo)
9058	goto no_packet;
9059	} while (sctp_wait_for_packet(sk, err, timeo_p: &timeo) == 0);
9060
9061	return NULL;
9062
9063	no_packet:
9064	*err = error;
9065	return NULL;
9066	}
9067
9068	/* If sndbuf has changed, wake up per association sndbuf waiters. */
9069	static void __sctp_write_space(struct sctp_association *asoc)
9070	{
9071	struct sock *sk = asoc->base.sk;
9072
9073	if (sctp_wspace(asoc) <= 0)
9074	return;
9075
9076	if (waitqueue_active(wq_head: &asoc->wait))
9077	wake_up_interruptible(&asoc->wait);
9078
9079	if (sctp_writeable(sk)) {
9080	struct socket_wq *wq;
9081
9082	rcu_read_lock();
9083	wq = rcu_dereference(sk->sk_wq);
9084	if (wq) {
9085	if (waitqueue_active(wq_head: &wq->wait))
9086	wake_up_interruptible(&wq->wait);
9087
9088	/* Note that we try to include the Async I/O support
9089	* here by modeling from the current TCP/UDP code.
9090	* We have not tested with it yet.
9091	*/
9092	if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9093	sock_wake_async(sk_wq: wq, how: SOCK_WAKE_SPACE, POLL_OUT);
9094	}
9095	rcu_read_unlock();
9096	}
9097	}
9098
9099	static void sctp_wake_up_waiters(struct sock *sk,
9100	struct sctp_association *asoc)
9101	{
9102	struct sctp_association *tmp = asoc;
9103
9104	/* We do accounting for the sndbuf space per association,
9105	* so we only need to wake our own association.
9106	*/
9107	if (asoc->ep->sndbuf_policy)
9108	return __sctp_write_space(asoc);
9109
9110	/* If association goes down and is just flushing its
9111	* outq, then just normally notify others.
9112	*/
9113	if (asoc->base.dead)
9114	return sctp_write_space(sk);
9115
9116	/* Accounting for the sndbuf space is per socket, so we
9117	* need to wake up others, try to be fair and in case of
9118	* other associations, let them have a go first instead
9119	* of just doing a sctp_write_space() call.
9120	*
9121	* Note that we reach sctp_wake_up_waiters() only when
9122	* associations free up queued chunks, thus we are under
9123	* lock and the list of associations on a socket is
9124	* guaranteed not to change.
9125	*/
9126	for (tmp = list_next_entry(tmp, asocs); 1;
9127	tmp = list_next_entry(tmp, asocs)) {
9128	/* Manually skip the head element. */
9129	if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9130	continue;
9131	/* Wake up association. */
9132	__sctp_write_space(asoc: tmp);
9133	/* We've reached the end. */
9134	if (tmp == asoc)
9135	break;
9136	}
9137	}
9138
9139	/* Do accounting for the sndbuf space.
9140	* Decrement the used sndbuf space of the corresponding association by the
9141	* data size which was just transmitted(freed).
9142	*/
9143	static void sctp_wfree(struct sk_buff *skb)
9144	{
9145	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9146	struct sctp_association *asoc = chunk->asoc;
9147	struct sock *sk = asoc->base.sk;
9148
9149	sk_mem_uncharge(sk, size: skb->truesize);
9150	sk_wmem_queued_add(sk, val: -(skb->truesize + sizeof(struct sctp_chunk)));
9151	asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9152	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9153	&sk->sk_wmem_alloc));
9154
9155	if (chunk->shkey) {
9156	struct sctp_shared_key *shkey = chunk->shkey;
9157
9158	/* refcnt == 2 and !list_empty mean after this release, it's
9159	* not being used anywhere, and it's time to notify userland
9160	* that this shkey can be freed if it's been deactivated.
9161	*/
9162	if (shkey->deactivated && !list_empty(head: &shkey->key_list) &&
9163	refcount_read(r: &shkey->refcnt) == 2) {
9164	struct sctp_ulpevent *ev;
9165
9166	ev = sctp_ulpevent_make_authkey(asoc, key_id: shkey->key_id,
9167	indication: SCTP_AUTH_FREE_KEY,
9168	GFP_KERNEL);
9169	if (ev)
9170	asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9171	}
9172	sctp_auth_shkey_release(sh_key: chunk->shkey);
9173	}
9174
9175	sock_wfree(skb);
9176	sctp_wake_up_waiters(sk, asoc);
9177
9178	sctp_association_put(asoc);
9179	}
9180
9181	/* Do accounting for the receive space on the socket.
9182	* Accounting for the association is done in ulpevent.c
9183	* We set this as a destructor for the cloned data skbs so that
9184	* accounting is done at the correct time.
9185	*/
9186	void sctp_sock_rfree(struct sk_buff *skb)
9187	{
9188	struct sock *sk = skb->sk;
9189	struct sctp_ulpevent *event = sctp_skb2event(skb);
9190
9191	atomic_sub(i: event->rmem_len, v: &sk->sk_rmem_alloc);
9192
9193	/*
9194	* Mimic the behavior of sock_rfree
9195	*/
9196	sk_mem_uncharge(sk, size: event->rmem_len);
9197	}
9198
9199
9200	/* Helper function to wait for space in the sndbuf. */
9201	static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9202	size_t msg_len)
9203	{
9204	struct sock *sk = asoc->base.sk;
9205	long current_timeo = *timeo_p;
9206	DEFINE_WAIT(wait);
9207	int err = 0;
9208
9209	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9210	*timeo_p, msg_len);
9211
9212	/* Increment the association's refcnt. */
9213	sctp_association_hold(asoc);
9214
9215	/* Wait on the association specific sndbuf space. */
9216	for (;;) {
9217	prepare_to_wait_exclusive(wq_head: &asoc->wait, wq_entry: &wait,
9218	TASK_INTERRUPTIBLE);
9219	if (asoc->base.dead)
9220	goto do_dead;
9221	if (!*timeo_p)
9222	goto do_nonblock;
9223	if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9224	goto do_error;
9225	if (signal_pending(current))
9226	goto do_interrupted;
9227	if ((int)msg_len <= sctp_wspace(asoc) &&
9228	sk_wmem_schedule(sk, size: msg_len))
9229	break;
9230
9231	/* Let another process have a go. Since we are going
9232	* to sleep anyway.
9233	*/
9234	release_sock(sk);
9235	current_timeo = schedule_timeout(timeout: current_timeo);
9236	lock_sock(sk);
9237	if (sk != asoc->base.sk)
9238	goto do_error;
9239
9240	*timeo_p = current_timeo;
9241	}
9242
9243	out:
9244	finish_wait(wq_head: &asoc->wait, wq_entry: &wait);
9245
9246	/* Release the association's refcnt. */
9247	sctp_association_put(asoc);
9248
9249	return err;
9250
9251	do_dead:
9252	err = -ESRCH;
9253	goto out;
9254
9255	do_error:
9256	err = -EPIPE;
9257	goto out;
9258
9259	do_interrupted:
9260	err = sock_intr_errno(timeo: *timeo_p);
9261	goto out;
9262
9263	do_nonblock:
9264	err = -EAGAIN;
9265	goto out;
9266	}
9267
9268	void sctp_data_ready(struct sock *sk)
9269	{
9270	struct socket_wq *wq;
9271
9272	trace_sk_data_ready(sk);
9273
9274	rcu_read_lock();
9275	wq = rcu_dereference(sk->sk_wq);
9276	if (skwq_has_sleeper(wq))
9277	wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9278	EPOLLRDNORM | EPOLLRDBAND);
9279	sk_wake_async(sk, how: SOCK_WAKE_WAITD, POLL_IN);
9280	rcu_read_unlock();
9281	}
9282
9283	/* If socket sndbuf has changed, wake up all per association waiters. */
9284	void sctp_write_space(struct sock *sk)
9285	{
9286	struct sctp_association *asoc;
9287
9288	/* Wake up the tasks in each wait queue. */
9289	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9290	__sctp_write_space(asoc);
9291	}
9292	}
9293
9294	/* Is there any sndbuf space available on the socket?
9295	*
9296	* Note that sk_wmem_alloc is the sum of the send buffers on all of the
9297	* associations on the same socket. For a UDP-style socket with
9298	* multiple associations, it is possible for it to be "unwriteable"
9299	* prematurely. I assume that this is acceptable because
9300	* a premature "unwriteable" is better than an accidental "writeable" which
9301	* would cause an unwanted block under certain circumstances. For the 1-1
9302	* UDP-style sockets or TCP-style sockets, this code should work.
9303	* - Daisy
9304	*/
9305	static bool sctp_writeable(const struct sock *sk)
9306	{
9307	return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
9308	}
9309
9310	/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9311	* returns immediately with EINPROGRESS.
9312	*/
9313	static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9314	{
9315	struct sock *sk = asoc->base.sk;
9316	int err = 0;
9317	long current_timeo = *timeo_p;
9318	DEFINE_WAIT(wait);
9319
9320	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9321
9322	/* Increment the association's refcnt. */
9323	sctp_association_hold(asoc);
9324
9325	for (;;) {
9326	prepare_to_wait_exclusive(wq_head: &asoc->wait, wq_entry: &wait,
9327	TASK_INTERRUPTIBLE);
9328	if (!*timeo_p)
9329	goto do_nonblock;
9330	if (sk->sk_shutdown & RCV_SHUTDOWN)
9331	break;
9332	if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9333	asoc->base.dead)
9334	goto do_error;
9335	if (signal_pending(current))
9336	goto do_interrupted;
9337
9338	if (sctp_state(asoc, ESTABLISHED))
9339	break;
9340
9341	/* Let another process have a go. Since we are going
9342	* to sleep anyway.
9343	*/
9344	release_sock(sk);
9345	current_timeo = schedule_timeout(timeout: current_timeo);
9346	lock_sock(sk);
9347
9348	*timeo_p = current_timeo;
9349	}
9350
9351	out:
9352	finish_wait(wq_head: &asoc->wait, wq_entry: &wait);
9353
9354	/* Release the association's refcnt. */
9355	sctp_association_put(asoc);
9356
9357	return err;
9358
9359	do_error:
9360	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9361	err = -ETIMEDOUT;
9362	else
9363	err = -ECONNREFUSED;
9364	goto out;
9365
9366	do_interrupted:
9367	err = sock_intr_errno(timeo: *timeo_p);
9368	goto out;
9369
9370	do_nonblock:
9371	err = -EINPROGRESS;
9372	goto out;
9373	}
9374
9375	static int sctp_wait_for_accept(struct sock *sk, long timeo)
9376	{
9377	struct sctp_endpoint *ep;
9378	int err = 0;
9379	DEFINE_WAIT(wait);
9380
9381	ep = sctp_sk(sk)->ep;
9382
9383
9384	for (;;) {
9385	prepare_to_wait_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait,
9386	TASK_INTERRUPTIBLE);
9387
9388	if (list_empty(head: &ep->asocs)) {
9389	release_sock(sk);
9390	timeo = schedule_timeout(timeout: timeo);
9391	lock_sock(sk);
9392	}
9393
9394	err = -EINVAL;
9395	if (!sctp_sstate(sk, LISTENING))
9396	break;
9397
9398	err = 0;
9399	if (!list_empty(head: &ep->asocs))
9400	break;
9401
9402	err = sock_intr_errno(timeo);
9403	if (signal_pending(current))
9404	break;
9405
9406	err = -EAGAIN;
9407	if (!timeo)
9408	break;
9409	}
9410
9411	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9412
9413	return err;
9414	}
9415
9416	static void sctp_wait_for_close(struct sock *sk, long timeout)
9417	{
9418	DEFINE_WAIT(wait);
9419
9420	do {
9421	prepare_to_wait(wq_head: sk_sleep(sk), wq_entry: &wait, TASK_INTERRUPTIBLE);
9422	if (list_empty(head: &sctp_sk(sk)->ep->asocs))
9423	break;
9424	release_sock(sk);
9425	timeout = schedule_timeout(timeout);
9426	lock_sock(sk);
9427	} while (!signal_pending(current) && timeout);
9428
9429	finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
9430	}
9431
9432	static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9433	{
9434	struct sk_buff *frag;
9435
9436	if (!skb->data_len)
9437	goto done;
9438
9439	/* Don't forget the fragments. */
9440	skb_walk_frags(skb, frag)
9441	sctp_skb_set_owner_r_frag(skb: frag, sk);
9442
9443	done:
9444	sctp_skb_set_owner_r(skb, sk);
9445	}
9446
9447	void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9448	struct sctp_association *asoc)
9449	{
9450	struct inet_sock *inet = inet_sk(sk);
9451	struct inet_sock *newinet;
9452	struct sctp_sock *sp = sctp_sk(sk);
9453
9454	newsk->sk_type = sk->sk_type;
9455	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9456	newsk->sk_flags = sk->sk_flags;
9457	newsk->sk_tsflags = sk->sk_tsflags;
9458	newsk->sk_no_check_tx = sk->sk_no_check_tx;
9459	newsk->sk_no_check_rx = sk->sk_no_check_rx;
9460	newsk->sk_reuse = sk->sk_reuse;
9461	sctp_sk(newsk)->reuse = sp->reuse;
9462
9463	newsk->sk_shutdown = sk->sk_shutdown;
9464	newsk->sk_destruct = sk->sk_destruct;
9465	newsk->sk_family = sk->sk_family;
9466	newsk->sk_protocol = IPPROTO_SCTP;
9467	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9468	newsk->sk_sndbuf = sk->sk_sndbuf;
9469	newsk->sk_rcvbuf = sk->sk_rcvbuf;
9470	newsk->sk_lingertime = sk->sk_lingertime;
9471	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9472	newsk->sk_sndtimeo = sk->sk_sndtimeo;
9473	newsk->sk_rxhash = sk->sk_rxhash;
9474
9475	newinet = inet_sk(newsk);
9476
9477	/* Initialize sk's sport, dport, rcv_saddr and daddr for
9478	* getsockname() and getpeername()
9479	*/
9480	newinet->inet_sport = inet->inet_sport;
9481	newinet->inet_saddr = inet->inet_saddr;
9482	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9483	newinet->inet_dport = htons(asoc->peer.port);
9484	newinet->pmtudisc = inet->pmtudisc;
9485	atomic_set(v: &newinet->inet_id, i: get_random_u16());
9486
9487	newinet->uc_ttl = inet->uc_ttl;
9488	inet_set_bit(MC_LOOP, newsk);
9489	newinet->mc_ttl = 1;
9490	newinet->mc_index = 0;
9491	newinet->mc_list = NULL;
9492
9493	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9494	net_enable_timestamp();
9495
9496	/* Set newsk security attributes from original sk and connection
9497	* security attribute from asoc.
9498	*/
9499	security_sctp_sk_clone(asoc, sk, newsk);
9500	}
9501
9502	static inline void sctp_copy_descendant(struct sock *sk_to,
9503	const struct sock *sk_from)
9504	{
9505	size_t ancestor_size = sizeof(struct inet_sock);
9506
9507	ancestor_size += sk_from->sk_prot->obj_size;
9508	ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9509	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9510	}
9511
9512	/* Populate the fields of the newsk from the oldsk and migrate the assoc
9513	* and its messages to the newsk.
9514	*/
9515	static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9516	struct sctp_association *assoc,
9517	enum sctp_socket_type type)
9518	{
9519	struct sctp_sock *oldsp = sctp_sk(oldsk);
9520	struct sctp_sock *newsp = sctp_sk(newsk);
9521	struct sctp_bind_bucket *pp; /* hash list port iterator */
9522	struct sctp_endpoint *newep = newsp->ep;
9523	struct sk_buff *skb, *tmp;
9524	struct sctp_ulpevent *event;
9525	struct sctp_bind_hashbucket *head;
9526	int err;
9527
9528	/* Migrate socket buffer sizes and all the socket level options to the
9529	* new socket.
9530	*/
9531	newsk->sk_sndbuf = oldsk->sk_sndbuf;
9532	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9533	/* Brute force copy old sctp opt. */
9534	sctp_copy_descendant(sk_to: newsk, sk_from: oldsk);
9535
9536	/* Restore the ep value that was overwritten with the above structure
9537	* copy.
9538	*/
9539	newsp->ep = newep;
9540	newsp->hmac = NULL;
9541
9542	/* Hook this new socket in to the bind_hash list. */
9543	head = &sctp_port_hashtable[sctp_phashfn(net: sock_net(sk: oldsk),
9544	inet_sk(oldsk)->inet_num)];
9545	spin_lock_bh(lock: &head->lock);
9546	pp = sctp_sk(oldsk)->bind_hash;
9547	sk_add_bind_node(sk: newsk, list: &pp->owner);
9548	sctp_sk(newsk)->bind_hash = pp;
9549	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9550	spin_unlock_bh(lock: &head->lock);
9551
9552	/* Copy the bind_addr list from the original endpoint to the new
9553	* endpoint so that we can handle restarts properly
9554	*/
9555	err = sctp_bind_addr_dup(dest: &newsp->ep->base.bind_addr,
9556	src: &oldsp->ep->base.bind_addr, GFP_KERNEL);
9557	if (err)
9558	return err;
9559
9560	/* New ep's auth_hmacs should be set if old ep's is set, in case
9561	* that net->sctp.auth_enable has been changed to 0 by users and
9562	* new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9563	*/
9564	if (oldsp->ep->auth_hmacs) {
9565	err = sctp_auth_init_hmacs(ep: newsp->ep, GFP_KERNEL);
9566	if (err)
9567	return err;
9568	}
9569
9570	sctp_auto_asconf_init(sp: newsp);
9571
9572	/* Move any messages in the old socket's receive queue that are for the
9573	* peeled off association to the new socket's receive queue.
9574	*/
9575	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9576	event = sctp_skb2event(skb);
9577	if (event->asoc == assoc) {
9578	__skb_unlink(skb, list: &oldsk->sk_receive_queue);
9579	__skb_queue_tail(list: &newsk->sk_receive_queue, newsk: skb);
9580	sctp_skb_set_owner_r_frag(skb, sk: newsk);
9581	}
9582	}
9583
9584	/* Clean up any messages pending delivery due to partial
9585	* delivery. Three cases:
9586	* 1) No partial deliver; no work.
9587	* 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9588	* 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9589	*/
9590	atomic_set(v: &sctp_sk(newsk)->pd_mode, i: assoc->ulpq.pd_mode);
9591
9592	if (atomic_read(v: &sctp_sk(oldsk)->pd_mode)) {
9593	struct sk_buff_head *queue;
9594
9595	/* Decide which queue to move pd_lobby skbs to. */
9596	if (assoc->ulpq.pd_mode) {
9597	queue = &newsp->pd_lobby;
9598	} else
9599	queue = &newsk->sk_receive_queue;
9600
9601	/* Walk through the pd_lobby, looking for skbs that
9602	* need moved to the new socket.
9603	*/
9604	sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9605	event = sctp_skb2event(skb);
9606	if (event->asoc == assoc) {
9607	__skb_unlink(skb, list: &oldsp->pd_lobby);
9608	__skb_queue_tail(list: queue, newsk: skb);
9609	sctp_skb_set_owner_r_frag(skb, sk: newsk);
9610	}
9611	}
9612
9613	/* Clear up any skbs waiting for the partial
9614	* delivery to finish.
9615	*/
9616	if (assoc->ulpq.pd_mode)
9617	sctp_clear_pd(sk: oldsk, NULL);
9618
9619	}
9620
9621	sctp_for_each_rx_skb(asoc: assoc, sk: newsk, cb: sctp_skb_set_owner_r_frag);
9622
9623	/* Set the type of socket to indicate that it is peeled off from the
9624	* original UDP-style socket or created with the accept() call on a
9625	* TCP-style socket..
9626	*/
9627	newsp->type = type;
9628
9629	/* Mark the new socket "in-use" by the user so that any packets
9630	* that may arrive on the association after we've moved it are
9631	* queued to the backlog. This prevents a potential race between
9632	* backlog processing on the old socket and new-packet processing
9633	* on the new socket.
9634	*
9635	* The caller has just allocated newsk so we can guarantee that other
9636	* paths won't try to lock it and then oldsk.
9637	*/
9638	lock_sock_nested(sk: newsk, SINGLE_DEPTH_NESTING);
9639	sctp_for_each_tx_datachunk(asoc: assoc, clear: true, cb: sctp_clear_owner_w);
9640	sctp_assoc_migrate(assoc, newsk);
9641	sctp_for_each_tx_datachunk(asoc: assoc, clear: false, cb: sctp_set_owner_w);
9642
9643	/* If the association on the newsk is already closed before accept()
9644	* is called, set RCV_SHUTDOWN flag.
9645	*/
9646	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9647	inet_sk_set_state(sk: newsk, state: SCTP_SS_CLOSED);
9648	newsk->sk_shutdown |= RCV_SHUTDOWN;
9649	} else {
9650	inet_sk_set_state(sk: newsk, state: SCTP_SS_ESTABLISHED);
9651	}
9652
9653	release_sock(sk: newsk);
9654
9655	return 0;
9656	}
9657
9658
9659	/* This proto struct describes the ULP interface for SCTP. */
9660	struct proto sctp_prot = {
9661	.name = "SCTP",
9662	.owner = THIS_MODULE,
9663	.close = sctp_close,
9664	.disconnect = sctp_disconnect,
9665	.accept = sctp_accept,
9666	.ioctl = sctp_ioctl,
9667	.init = sctp_init_sock,
9668	.destroy = sctp_destroy_sock,
9669	.shutdown = sctp_shutdown,
9670	.setsockopt = sctp_setsockopt,
9671	.getsockopt = sctp_getsockopt,
9672	.bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9673	.sendmsg = sctp_sendmsg,
9674	.recvmsg = sctp_recvmsg,
9675	.bind = sctp_bind,
9676	.bind_add = sctp_bind_add,
9677	.backlog_rcv = sctp_backlog_rcv,
9678	.hash = sctp_hash,
9679	.unhash = sctp_unhash,
9680	.no_autobind = true,
9681	.obj_size = sizeof(struct sctp_sock),
9682	.useroffset = offsetof(struct sctp_sock, subscribe),
9683	.usersize = offsetof(struct sctp_sock, initmsg) -
9684	offsetof(struct sctp_sock, subscribe) +
9685	sizeof_field(struct sctp_sock, initmsg),
9686	.sysctl_mem = sysctl_sctp_mem,
9687	.sysctl_rmem = sysctl_sctp_rmem,
9688	.sysctl_wmem = sysctl_sctp_wmem,
9689	.memory_pressure = &sctp_memory_pressure,
9690	.enter_memory_pressure = sctp_enter_memory_pressure,
9691
9692	.memory_allocated = &sctp_memory_allocated,
9693	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9694
9695	.sockets_allocated = &sctp_sockets_allocated,
9696	};
9697
9698	#if IS_ENABLED(CONFIG_IPV6)
9699
9700	static void sctp_v6_destruct_sock(struct sock *sk)
9701	{
9702	sctp_destruct_common(sk);
9703	inet6_sock_destruct(sk);
9704	}
9705
9706	static int sctp_v6_init_sock(struct sock *sk)
9707	{
9708	int ret = sctp_init_sock(sk);
9709
9710	if (!ret)
9711	sk->sk_destruct = sctp_v6_destruct_sock;
9712
9713	return ret;
9714	}
9715
9716	struct proto sctpv6_prot = {
9717	.name = "SCTPv6",
9718	.owner = THIS_MODULE,
9719	.close = sctp_close,
9720	.disconnect = sctp_disconnect,
9721	.accept = sctp_accept,
9722	.ioctl = sctp_ioctl,
9723	.init = sctp_v6_init_sock,
9724	.destroy = sctp_destroy_sock,
9725	.shutdown = sctp_shutdown,
9726	.setsockopt = sctp_setsockopt,
9727	.getsockopt = sctp_getsockopt,
9728	.bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9729	.sendmsg = sctp_sendmsg,
9730	.recvmsg = sctp_recvmsg,
9731	.bind = sctp_bind,
9732	.bind_add = sctp_bind_add,
9733	.backlog_rcv = sctp_backlog_rcv,
9734	.hash = sctp_hash,
9735	.unhash = sctp_unhash,
9736	.no_autobind = true,
9737	.obj_size = sizeof(struct sctp6_sock),
9738	.ipv6_pinfo_offset = offsetof(struct sctp6_sock, inet6),
9739	.useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9740	.usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9741	offsetof(struct sctp6_sock, sctp.subscribe) +
9742	sizeof_field(struct sctp6_sock, sctp.initmsg),
9743	.sysctl_mem = sysctl_sctp_mem,
9744	.sysctl_rmem = sysctl_sctp_rmem,
9745	.sysctl_wmem = sysctl_sctp_wmem,
9746	.memory_pressure = &sctp_memory_pressure,
9747	.enter_memory_pressure = sctp_enter_memory_pressure,
9748
9749	.memory_allocated = &sctp_memory_allocated,
9750	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9751
9752	.sockets_allocated = &sctp_sockets_allocated,
9753	};
9754	#endif /* IS_ENABLED(CONFIG_IPV6) */
9755