1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* INET An implementation of the TCP/IP protocol suite for the LINUX
4	* operating system. INET is implemented using the BSD Socket
5	* interface as the means of communication with the user level.
6	*
7	* PF_INET protocol family socket handler.
8	*
9	* Authors: Ross Biro
10	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11	* Florian La Roche, <flla@stud.uni-sb.de>
12	* Alan Cox, <A.Cox@swansea.ac.uk>
13	*
14	* Changes (see also sock.c)
15	*
16	* piggy,
17	* Karl Knutson : Socket protocol table
18	* A.N.Kuznetsov : Socket death error in accept().
19	* John Richardson : Fix non blocking error in connect()
20	* so sockets that fail to connect
21	* don't return -EINPROGRESS.
22	* Alan Cox : Asynchronous I/O support
23	* Alan Cox : Keep correct socket pointer on sock
24	* structures
25	* when accept() ed
26	* Alan Cox : Semantics of SO_LINGER aren't state
27	* moved to close when you look carefully.
28	* With this fixed and the accept bug fixed
29	* some RPC stuff seems happier.
30	* Niibe Yutaka : 4.4BSD style write async I/O
31	* Alan Cox,
32	* Tony Gale : Fixed reuse semantics.
33	* Alan Cox : bind() shouldn't abort existing but dead
34	* sockets. Stops FTP netin:.. I hope.
35	* Alan Cox : bind() works correctly for RAW sockets.
36	* Note that FreeBSD at least was broken
37	* in this respect so be careful with
38	* compatibility tests...
39	* Alan Cox : routing cache support
40	* Alan Cox : memzero the socket structure for
41	* compactness.
42	* Matt Day : nonblock connect error handler
43	* Alan Cox : Allow large numbers of pending sockets
44	* (eg for big web sites), but only if
45	* specifically application requested.
46	* Alan Cox : New buffering throughout IP. Used
47	* dumbly.
48	* Alan Cox : New buffering now used smartly.
49	* Alan Cox : BSD rather than common sense
50	* interpretation of listen.
51	* Germano Caronni : Assorted small races.
52	* Alan Cox : sendmsg/recvmsg basic support.
53	* Alan Cox : Only sendmsg/recvmsg now supported.
54	* Alan Cox : Locked down bind (see security list).
55	* Alan Cox : Loosened bind a little.
56	* Mike McLagan : ADD/DEL DLCI Ioctls
57	* Willy Konynenberg : Transparent proxying support.
58	* David S. Miller : New socket lookup architecture.
59	* Some other random speedups.
60	* Cyrus Durgin : Cleaned up file for kmod hacks.
61	* Andi Kleen : Fix inet_stream_connect TCP race.
62	*/
63
64	#define pr_fmt(fmt) "IPv4: " fmt
65
66	#include <linux/err.h>
67	#include <linux/errno.h>
68	#include <linux/types.h>
69	#include <linux/socket.h>
70	#include <linux/in.h>
71	#include <linux/kernel.h>
72	#include <linux/kmod.h>
73	#include <linux/sched.h>
74	#include <linux/timer.h>
75	#include <linux/string.h>
76	#include <linux/sockios.h>
77	#include <linux/net.h>
78	#include <linux/capability.h>
79	#include <linux/fcntl.h>
80	#include <linux/mm.h>
81	#include <linux/interrupt.h>
82	#include <linux/stat.h>
83	#include <linux/init.h>
84	#include <linux/poll.h>
85	#include <linux/netfilter_ipv4.h>
86	#include <linux/random.h>
87	#include <linux/slab.h>
88
89	#include <linux/uaccess.h>
90
91	#include <linux/inet.h>
92	#include <linux/igmp.h>
93	#include <linux/inetdevice.h>
94	#include <linux/netdevice.h>
95	#include <net/checksum.h>
96	#include <net/ip.h>
97	#include <net/protocol.h>
98	#include <net/arp.h>
99	#include <net/route.h>
100	#include <net/ip_fib.h>
101	#include <net/inet_connection_sock.h>
102	#include <net/gro.h>
103	#include <net/gso.h>
104	#include <net/tcp.h>
105	#include <net/udp.h>
106	#include <net/udplite.h>
107	#include <net/ping.h>
108	#include <linux/skbuff.h>
109	#include <net/sock.h>
110	#include <net/raw.h>
111	#include <net/icmp.h>
112	#include <net/inet_common.h>
113	#include <net/ip_tunnels.h>
114	#include <net/xfrm.h>
115	#include <net/net_namespace.h>
116	#include <net/secure_seq.h>
117	#ifdef CONFIG_IP_MROUTE
118	#include <linux/mroute.h>
119	#endif
120	#include <net/l3mdev.h>
121	#include <net/compat.h>
122	#include <net/rps.h>
123
124	#include <trace/events/sock.h>
125
126	/* The inetsw table contains everything that inet_create needs to
127	* build a new socket.
128	*/
129	static struct list_head inetsw[SOCK_MAX];
130	static DEFINE_SPINLOCK(inetsw_lock);
131
132	/* New destruction routine */
133
134	void inet_sock_destruct(struct sock *sk)
135	{
136	struct inet_sock *inet = inet_sk(sk);
137
138	__skb_queue_purge(list: &sk->sk_receive_queue);
139	__skb_queue_purge(list: &sk->sk_error_queue);
140
141	sk_mem_reclaim_final(sk);
142
143	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144	pr_err("Attempt to release TCP socket in state %d %p\n",
145	sk->sk_state, sk);
146	return;
147	}
148	if (!sock_flag(sk, flag: SOCK_DEAD)) {
149	pr_err("Attempt to release alive inet socket %p\n", sk);
150	return;
151	}
152
153	WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
154	WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
155	WARN_ON_ONCE(sk->sk_wmem_queued);
156	WARN_ON_ONCE(sk->sk_forward_alloc);
157
158	kfree(rcu_dereference_protected(inet->inet_opt, 1));
159	dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
160	dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
161	}
162	EXPORT_SYMBOL(inet_sock_destruct);
163
164	/*
165	* The routines beyond this point handle the behaviour of an AF_INET
166	* socket object. Mostly it punts to the subprotocols of IP to do
167	* the work.
168	*/
169
170	/*
171	* Automatically bind an unbound socket.
172	*/
173
174	static int inet_autobind(struct sock *sk)
175	{
176	struct inet_sock *inet;
177	/* We may need to bind the socket. */
178	lock_sock(sk);
179	inet = inet_sk(sk);
180	if (!inet->inet_num) {
181	if (sk->sk_prot->get_port(sk, 0)) {
182	release_sock(sk);
183	return -EAGAIN;
184	}
185	inet->inet_sport = htons(inet->inet_num);
186	}
187	release_sock(sk);
188	return 0;
189	}
190
191	int __inet_listen_sk(struct sock *sk, int backlog)
192	{
193	unsigned char old_state = sk->sk_state;
194	int err, tcp_fastopen;
195
196	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
197	return -EINVAL;
198
199	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
200	/* Really, if the socket is already in listen state
201	* we can only allow the backlog to be adjusted.
202	*/
203	if (old_state != TCP_LISTEN) {
204	/* Enable TFO w/o requiring TCP_FASTOPEN socket option.
205	* Note that only TCP sockets (SOCK_STREAM) will reach here.
206	* Also fastopen backlog may already been set via the option
207	* because the socket was in TCP_LISTEN state previously but
208	* was shutdown() rather than close().
209	*/
210	tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
211	if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
212	(tcp_fastopen & TFO_SERVER_ENABLE) &&
213	!inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
214	fastopen_queue_tune(sk, backlog);
215	tcp_fastopen_init_key_once(net: sock_net(sk));
216	}
217
218	err = inet_csk_listen_start(sk);
219	if (err)
220	return err;
221
222	tcp_call_bpf(sk, op: BPF_SOCK_OPS_TCP_LISTEN_CB, nargs: 0, NULL);
223	}
224	return 0;
225	}
226
227	/*
228	* Move a socket into listening state.
229	*/
230	int inet_listen(struct socket *sock, int backlog)
231	{
232	struct sock *sk = sock->sk;
233	int err = -EINVAL;
234
235	lock_sock(sk);
236
237	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
238	goto out;
239
240	err = __inet_listen_sk(sk, backlog);
241
242	out:
243	release_sock(sk);
244	return err;
245	}
246	EXPORT_SYMBOL(inet_listen);
247
248	/*
249	* Create an inet socket.
250	*/
251
252	static int inet_create(struct net *net, struct socket *sock, int protocol,
253	int kern)
254	{
255	struct sock *sk;
256	struct inet_protosw *answer;
257	struct inet_sock *inet;
258	struct proto *answer_prot;
259	unsigned char answer_flags;
260	int try_loading_module = 0;
261	int err;
262
263	if (protocol < 0 || protocol >= IPPROTO_MAX)
264	return -EINVAL;
265
266	sock->state = SS_UNCONNECTED;
267
268	/* Look for the requested type/protocol pair. */
269	lookup_protocol:
270	err = -ESOCKTNOSUPPORT;
271	rcu_read_lock();
272	list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
273
274	err = 0;
275	/* Check the non-wild match. */
276	if (protocol == answer->protocol) {
277	if (protocol != IPPROTO_IP)
278	break;
279	} else {
280	/* Check for the two wild cases. */
281	if (IPPROTO_IP == protocol) {
282	protocol = answer->protocol;
283	break;
284	}
285	if (IPPROTO_IP == answer->protocol)
286	break;
287	}
288	err = -EPROTONOSUPPORT;
289	}
290
291	if (unlikely(err)) {
292	if (try_loading_module < 2) {
293	rcu_read_unlock();
294	/*
295	* Be more specific, e.g. net-pf-2-proto-132-type-1
296	* (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
297	*/
298	if (++try_loading_module == 1)
299	request_module("net-pf-%d-proto-%d-type-%d",
300	PF_INET, protocol, sock->type);
301	/*
302	* Fall back to generic, e.g. net-pf-2-proto-132
303	* (net-pf-PF_INET-proto-IPPROTO_SCTP)
304	*/
305	else
306	request_module("net-pf-%d-proto-%d",
307	PF_INET, protocol);
308	goto lookup_protocol;
309	} else
310	goto out_rcu_unlock;
311	}
312
313	err = -EPERM;
314	if (sock->type == SOCK_RAW && !kern &&
315	!ns_capable(ns: net->user_ns, CAP_NET_RAW))
316	goto out_rcu_unlock;
317
318	sock->ops = answer->ops;
319	answer_prot = answer->prot;
320	answer_flags = answer->flags;
321	rcu_read_unlock();
322
323	WARN_ON(!answer_prot->slab);
324
325	err = -ENOMEM;
326	sk = sk_alloc(net, PF_INET, GFP_KERNEL, prot: answer_prot, kern);
327	if (!sk)
328	goto out;
329
330	err = 0;
331	if (INET_PROTOSW_REUSE & answer_flags)
332	sk->sk_reuse = SK_CAN_REUSE;
333
334	if (INET_PROTOSW_ICSK & answer_flags)
335	inet_init_csk_locks(sk);
336
337	inet = inet_sk(sk);
338	inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
339
340	inet_clear_bit(NODEFRAG, sk);
341
342	if (SOCK_RAW == sock->type) {
343	inet->inet_num = protocol;
344	if (IPPROTO_RAW == protocol)
345	inet_set_bit(HDRINCL, sk);
346	}
347
348	if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
349	inet->pmtudisc = IP_PMTUDISC_DONT;
350	else
351	inet->pmtudisc = IP_PMTUDISC_WANT;
352
353	atomic_set(v: &inet->inet_id, i: 0);
354
355	sock_init_data(sock, sk);
356
357	sk->sk_destruct = inet_sock_destruct;
358	sk->sk_protocol = protocol;
359	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
360	sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
361
362	inet->uc_ttl = -1;
363	inet_set_bit(MC_LOOP, sk);
364	inet->mc_ttl = 1;
365	inet_set_bit(MC_ALL, sk);
366	inet->mc_index = 0;
367	inet->mc_list = NULL;
368	inet->rcv_tos = 0;
369
370	if (inet->inet_num) {
371	/* It assumes that any protocol which allows
372	* the user to assign a number at socket
373	* creation time automatically
374	* shares.
375	*/
376	inet->inet_sport = htons(inet->inet_num);
377	/* Add to protocol hash chains. */
378	err = sk->sk_prot->hash(sk);
379	if (err)
380	goto out_sk_release;
381	}
382
383	if (sk->sk_prot->init) {
384	err = sk->sk_prot->init(sk);
385	if (err)
386	goto out_sk_release;
387	}
388
389	if (!kern) {
390	err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
391	if (err)
392	goto out_sk_release;
393	}
394	out:
395	return err;
396	out_rcu_unlock:
397	rcu_read_unlock();
398	goto out;
399	out_sk_release:
400	sk_common_release(sk);
401	sock->sk = NULL;
402	goto out;
403	}
404
405
406	/*
407	* The peer socket should always be NULL (or else). When we call this
408	* function we are destroying the object and from then on nobody
409	* should refer to it.
410	*/
411	int inet_release(struct socket *sock)
412	{
413	struct sock *sk = sock->sk;
414
415	if (sk) {
416	long timeout;
417
418	if (!sk->sk_kern_sock)
419	BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
420
421	/* Applications forget to leave groups before exiting */
422	ip_mc_drop_socket(sk);
423
424	/* If linger is set, we don't return until the close
425	* is complete. Otherwise we return immediately. The
426	* actually closing is done the same either way.
427	*
428	* If the close is due to the process exiting, we never
429	* linger..
430	*/
431	timeout = 0;
432	if (sock_flag(sk, flag: SOCK_LINGER) &&
433	!(current->flags & PF_EXITING))
434	timeout = sk->sk_lingertime;
435	sk->sk_prot->close(sk, timeout);
436	sock->sk = NULL;
437	}
438	return 0;
439	}
440	EXPORT_SYMBOL(inet_release);
441
442	int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
443	{
444	u32 flags = BIND_WITH_LOCK;
445	int err;
446
447	/* If the socket has its own bind function then use it. (RAW) */
448	if (sk->sk_prot->bind) {
449	return sk->sk_prot->bind(sk, uaddr, addr_len);
450	}
451	if (addr_len < sizeof(struct sockaddr_in))
452	return -EINVAL;
453
454	/* BPF prog is run before any checks are done so that if the prog
455	* changes context in a wrong way it will be caught.
456	*/
457	err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
458	CGROUP_INET4_BIND, &flags);
459	if (err)
460	return err;
461
462	return __inet_bind(sk, uaddr, addr_len, flags);
463	}
464
465	int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
466	{
467	return inet_bind_sk(sk: sock->sk, uaddr, addr_len);
468	}
469	EXPORT_SYMBOL(inet_bind);
470
471	int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
472	u32 flags)
473	{
474	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
475	struct inet_sock *inet = inet_sk(sk);
476	struct net *net = sock_net(sk);
477	unsigned short snum;
478	int chk_addr_ret;
479	u32 tb_id = RT_TABLE_LOCAL;
480	int err;
481
482	if (addr->sin_family != AF_INET) {
483	/* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
484	* only if s_addr is INADDR_ANY.
485	*/
486	err = -EAFNOSUPPORT;
487	if (addr->sin_family != AF_UNSPEC ||
488	addr->sin_addr.s_addr != htonl(INADDR_ANY))
489	goto out;
490	}
491
492	tb_id = l3mdev_fib_table_by_index(net, ifindex: sk->sk_bound_dev_if) ? : tb_id;
493	chk_addr_ret = inet_addr_type_table(net, addr: addr->sin_addr.s_addr, tb_id);
494
495	/* Not specified by any standard per-se, however it breaks too
496	* many applications when removed. It is unfortunate since
497	* allowing applications to make a non-local bind solves
498	* several problems with systems using dynamic addressing.
499	* (ie. your servers still start up even if your ISDN link
500	* is temporarily down)
501	*/
502	err = -EADDRNOTAVAIL;
503	if (!inet_addr_valid_or_nonlocal(net, inet, addr: addr->sin_addr.s_addr,
504	addr_type: chk_addr_ret))
505	goto out;
506
507	snum = ntohs(addr->sin_port);
508	err = -EACCES;
509	if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
510	snum && inet_port_requires_bind_service(net, port: snum) &&
511	!ns_capable(ns: net->user_ns, CAP_NET_BIND_SERVICE))
512	goto out;
513
514	/* We keep a pair of addresses. rcv_saddr is the one
515	* used by hash lookups, and saddr is used for transmit.
516	*
517	* In the BSD API these are the same except where it
518	* would be illegal to use them (multicast/broadcast) in
519	* which case the sending device address is used.
520	*/
521	if (flags & BIND_WITH_LOCK)
522	lock_sock(sk);
523
524	/* Check these errors (active socket, double bind). */
525	err = -EINVAL;
526	if (sk->sk_state != TCP_CLOSE || inet->inet_num)
527	goto out_release_sock;
528
529	inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
530	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
531	inet->inet_saddr = 0; /* Use device */
532
533	/* Make sure we are allowed to bind here. */
534	if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
535	(flags & BIND_FORCE_ADDRESS_NO_PORT))) {
536	err = sk->sk_prot->get_port(sk, snum);
537	if (err) {
538	inet->inet_saddr = inet->inet_rcv_saddr = 0;
539	goto out_release_sock;
540	}
541	if (!(flags & BIND_FROM_BPF)) {
542	err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
543	if (err) {
544	inet->inet_saddr = inet->inet_rcv_saddr = 0;
545	if (sk->sk_prot->put_port)
546	sk->sk_prot->put_port(sk);
547	goto out_release_sock;
548	}
549	}
550	}
551
552	if (inet->inet_rcv_saddr)
553	sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
554	if (snum)
555	sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
556	inet->inet_sport = htons(inet->inet_num);
557	inet->inet_daddr = 0;
558	inet->inet_dport = 0;
559	sk_dst_reset(sk);
560	err = 0;
561	out_release_sock:
562	if (flags & BIND_WITH_LOCK)
563	release_sock(sk);
564	out:
565	return err;
566	}
567
568	int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
569	int addr_len, int flags)
570	{
571	struct sock *sk = sock->sk;
572	const struct proto *prot;
573	int err;
574
575	if (addr_len < sizeof(uaddr->sa_family))
576	return -EINVAL;
577
578	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
579	prot = READ_ONCE(sk->sk_prot);
580
581	if (uaddr->sa_family == AF_UNSPEC)
582	return prot->disconnect(sk, flags);
583
584	if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
585	err = prot->pre_connect(sk, uaddr, addr_len);
586	if (err)
587	return err;
588	}
589
590	if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
591	return -EAGAIN;
592	return prot->connect(sk, uaddr, addr_len);
593	}
594	EXPORT_SYMBOL(inet_dgram_connect);
595
596	static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
597	{
598	DEFINE_WAIT_FUNC(wait, woken_wake_function);
599
600	add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
601	sk->sk_write_pending += writebias;
602
603	/* Basic assumption: if someone sets sk->sk_err, he _must_
604	* change state of the socket from TCP_SYN_*.
605	* Connect() does not allow to get error notifications
606	* without closing the socket.
607	*/
608	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
609	release_sock(sk);
610	timeo = wait_woken(wq_entry: &wait, TASK_INTERRUPTIBLE, timeout: timeo);
611	lock_sock(sk);
612	if (signal_pending(current) || !timeo)
613	break;
614	}
615	remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
616	sk->sk_write_pending -= writebias;
617	return timeo;
618	}
619
620	/*
621	* Connect to a remote host. There is regrettably still a little
622	* TCP 'magic' in here.
623	*/
624	int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
625	int addr_len, int flags, int is_sendmsg)
626	{
627	struct sock *sk = sock->sk;
628	int err;
629	long timeo;
630
631	/*
632	* uaddr can be NULL and addr_len can be 0 if:
633	* sk is a TCP fastopen active socket and
634	* TCP_FASTOPEN_CONNECT sockopt is set and
635	* we already have a valid cookie for this socket.
636	* In this case, user can call write() after connect().
637	* write() will invoke tcp_sendmsg_fastopen() which calls
638	* __inet_stream_connect().
639	*/
640	if (uaddr) {
641	if (addr_len < sizeof(uaddr->sa_family))
642	return -EINVAL;
643
644	if (uaddr->sa_family == AF_UNSPEC) {
645	sk->sk_disconnects++;
646	err = sk->sk_prot->disconnect(sk, flags);
647	sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
648	goto out;
649	}
650	}
651
652	switch (sock->state) {
653	default:
654	err = -EINVAL;
655	goto out;
656	case SS_CONNECTED:
657	err = -EISCONN;
658	goto out;
659	case SS_CONNECTING:
660	if (inet_test_bit(DEFER_CONNECT, sk))
661	err = is_sendmsg ? -EINPROGRESS : -EISCONN;
662	else
663	err = -EALREADY;
664	/* Fall out of switch with err, set for this state */
665	break;
666	case SS_UNCONNECTED:
667	err = -EISCONN;
668	if (sk->sk_state != TCP_CLOSE)
669	goto out;
670
671	if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
672	err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
673	if (err)
674	goto out;
675	}
676
677	err = sk->sk_prot->connect(sk, uaddr, addr_len);
678	if (err < 0)
679	goto out;
680
681	sock->state = SS_CONNECTING;
682
683	if (!err && inet_test_bit(DEFER_CONNECT, sk))
684	goto out;
685
686	/* Just entered SS_CONNECTING state; the only
687	* difference is that return value in non-blocking
688	* case is EINPROGRESS, rather than EALREADY.
689	*/
690	err = -EINPROGRESS;
691	break;
692	}
693
694	timeo = sock_sndtimeo(sk, noblock: flags & O_NONBLOCK);
695
696	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
697	int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
698	tcp_sk(sk)->fastopen_req &&
699	tcp_sk(sk)->fastopen_req->data ? 1 : 0;
700	int dis = sk->sk_disconnects;
701
702	/* Error code is set above */
703	if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
704	goto out;
705
706	err = sock_intr_errno(timeo);
707	if (signal_pending(current))
708	goto out;
709
710	if (dis != sk->sk_disconnects) {
711	err = -EPIPE;
712	goto out;
713	}
714	}
715
716	/* Connection was closed by RST, timeout, ICMP error
717	* or another process disconnected us.
718	*/
719	if (sk->sk_state == TCP_CLOSE)
720	goto sock_error;
721
722	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
723	* and error was received after socket entered established state.
724	* Hence, it is handled normally after connect() return successfully.
725	*/
726
727	sock->state = SS_CONNECTED;
728	err = 0;
729	out:
730	return err;
731
732	sock_error:
733	err = sock_error(sk) ? : -ECONNABORTED;
734	sock->state = SS_UNCONNECTED;
735	sk->sk_disconnects++;
736	if (sk->sk_prot->disconnect(sk, flags))
737	sock->state = SS_DISCONNECTING;
738	goto out;
739	}
740	EXPORT_SYMBOL(__inet_stream_connect);
741
742	int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
743	int addr_len, int flags)
744	{
745	int err;
746
747	lock_sock(sk: sock->sk);
748	err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
749	release_sock(sk: sock->sk);
750	return err;
751	}
752	EXPORT_SYMBOL(inet_stream_connect);
753
754	void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
755	{
756	sock_rps_record_flow(sk: newsk);
757	WARN_ON(!((1 << newsk->sk_state) &
758	(TCPF_ESTABLISHED | TCPF_SYN_RECV |
759	TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
760	TCPF_CLOSING | TCPF_CLOSE_WAIT |
761	TCPF_CLOSE)));
762
763	if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
764	set_bit(nr: SOCK_SUPPORT_ZC, addr: &newsock->flags);
765	sock_graft(sk: newsk, parent: newsock);
766
767	newsock->state = SS_CONNECTED;
768	}
769
770	/*
771	* Accept a pending connection. The TCP layer now gives BSD semantics.
772	*/
773
774	int inet_accept(struct socket *sock, struct socket *newsock,
775	struct proto_accept_arg *arg)
776	{
777	struct sock *sk1 = sock->sk, *sk2;
778
779	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
780	arg->err = -EINVAL;
781	sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg);
782	if (!sk2)
783	return arg->err;
784
785	lock_sock(sk: sk2);
786	__inet_accept(sock, newsock, newsk: sk2);
787	release_sock(sk: sk2);
788	return 0;
789	}
790	EXPORT_SYMBOL(inet_accept);
791
792	/*
793	* This does both peername and sockname.
794	*/
795	int inet_getname(struct socket *sock, struct sockaddr *uaddr,
796	int peer)
797	{
798	struct sock *sk = sock->sk;
799	struct inet_sock *inet = inet_sk(sk);
800	DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
801	int sin_addr_len = sizeof(*sin);
802
803	sin->sin_family = AF_INET;
804	lock_sock(sk);
805	if (peer) {
806	if (!inet->inet_dport ||
807	(((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
808	peer == 1)) {
809	release_sock(sk);
810	return -ENOTCONN;
811	}
812	sin->sin_port = inet->inet_dport;
813	sin->sin_addr.s_addr = inet->inet_daddr;
814	BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
815	CGROUP_INET4_GETPEERNAME);
816	} else {
817	__be32 addr = inet->inet_rcv_saddr;
818	if (!addr)
819	addr = inet->inet_saddr;
820	sin->sin_port = inet->inet_sport;
821	sin->sin_addr.s_addr = addr;
822	BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
823	CGROUP_INET4_GETSOCKNAME);
824	}
825	release_sock(sk);
826	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
827	return sin_addr_len;
828	}
829	EXPORT_SYMBOL(inet_getname);
830
831	int inet_send_prepare(struct sock *sk)
832	{
833	sock_rps_record_flow(sk);
834
835	/* We may need to bind the socket. */
836	if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
837	inet_autobind(sk))
838	return -EAGAIN;
839
840	return 0;
841	}
842	EXPORT_SYMBOL_GPL(inet_send_prepare);
843
844	int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
845	{
846	struct sock *sk = sock->sk;
847
848	if (unlikely(inet_send_prepare(sk)))
849	return -EAGAIN;
850
851	return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
852	sk, msg, size);
853	}
854	EXPORT_SYMBOL(inet_sendmsg);
855
856	void inet_splice_eof(struct socket *sock)
857	{
858	const struct proto *prot;
859	struct sock *sk = sock->sk;
860
861	if (unlikely(inet_send_prepare(sk)))
862	return;
863
864	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
865	prot = READ_ONCE(sk->sk_prot);
866	if (prot->splice_eof)
867	prot->splice_eof(sock);
868	}
869	EXPORT_SYMBOL_GPL(inet_splice_eof);
870
871	INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
872	size_t, int, int *));
873	int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
874	int flags)
875	{
876	struct sock *sk = sock->sk;
877	int addr_len = 0;
878	int err;
879
880	if (likely(!(flags & MSG_ERRQUEUE)))
881	sock_rps_record_flow(sk);
882
883	err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
884	sk, msg, size, flags, &addr_len);
885	if (err >= 0)
886	msg->msg_namelen = addr_len;
887	return err;
888	}
889	EXPORT_SYMBOL(inet_recvmsg);
890
891	int inet_shutdown(struct socket *sock, int how)
892	{
893	struct sock *sk = sock->sk;
894	int err = 0;
895
896	/* This should really check to make sure
897	* the socket is a TCP socket. (WHY AC...)
898	*/
899	how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
900	1->2 bit 2 snds.
901	2->3 */
902	if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
903	return -EINVAL;
904
905	lock_sock(sk);
906	if (sock->state == SS_CONNECTING) {
907	if ((1 << sk->sk_state) &
908	(TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
909	sock->state = SS_DISCONNECTING;
910	else
911	sock->state = SS_CONNECTED;
912	}
913
914	switch (sk->sk_state) {
915	case TCP_CLOSE:
916	err = -ENOTCONN;
917	/* Hack to wake up other listeners, who can poll for
918	EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
919	fallthrough;
920	default:
921	WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
922	if (sk->sk_prot->shutdown)
923	sk->sk_prot->shutdown(sk, how);
924	break;
925
926	/* Remaining two branches are temporary solution for missing
927	* close() in multithreaded environment. It is _not_ a good idea,
928	* but we have no choice until close() is repaired at VFS level.
929	*/
930	case TCP_LISTEN:
931	if (!(how & RCV_SHUTDOWN))
932	break;
933	fallthrough;
934	case TCP_SYN_SENT:
935	err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
936	sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
937	break;
938	}
939
940	/* Wake up anyone sleeping in poll. */
941	sk->sk_state_change(sk);
942	release_sock(sk);
943	return err;
944	}
945	EXPORT_SYMBOL(inet_shutdown);
946
947	/*
948	* ioctl() calls you can issue on an INET socket. Most of these are
949	* device configuration and stuff and very rarely used. Some ioctls
950	* pass on to the socket itself.
951	*
952	* NOTE: I like the idea of a module for the config stuff. ie ifconfig
953	* loads the devconfigure module does its configuring and unloads it.
954	* There's a good 20K of config code hanging around the kernel.
955	*/
956
957	int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
958	{
959	struct sock *sk = sock->sk;
960	int err = 0;
961	struct net *net = sock_net(sk);
962	void __user *p = (void __user *)arg;
963	struct ifreq ifr;
964	struct rtentry rt;
965
966	switch (cmd) {
967	case SIOCADDRT:
968	case SIOCDELRT:
969	if (copy_from_user(to: &rt, from: p, n: sizeof(struct rtentry)))
970	return -EFAULT;
971	err = ip_rt_ioctl(net, cmd, rt: &rt);
972	break;
973	case SIOCRTMSG:
974	err = -EINVAL;
975	break;
976	case SIOCDARP:
977	case SIOCGARP:
978	case SIOCSARP:
979	err = arp_ioctl(net, cmd, arg: (void __user *)arg);
980	break;
981	case SIOCGIFADDR:
982	case SIOCGIFBRDADDR:
983	case SIOCGIFNETMASK:
984	case SIOCGIFDSTADDR:
985	case SIOCGIFPFLAGS:
986	if (get_user_ifreq(ifr: &ifr, NULL, arg: p))
987	return -EFAULT;
988	err = devinet_ioctl(net, cmd, &ifr);
989	if (!err && put_user_ifreq(ifr: &ifr, arg: p))
990	err = -EFAULT;
991	break;
992
993	case SIOCSIFADDR:
994	case SIOCSIFBRDADDR:
995	case SIOCSIFNETMASK:
996	case SIOCSIFDSTADDR:
997	case SIOCSIFPFLAGS:
998	case SIOCSIFFLAGS:
999	if (get_user_ifreq(ifr: &ifr, NULL, arg: p))
1000	return -EFAULT;
1001	err = devinet_ioctl(net, cmd, &ifr);
1002	break;
1003	default:
1004	if (sk->sk_prot->ioctl)
1005	err = sk_ioctl(sk, cmd, arg: (void __user *)arg);
1006	else
1007	err = -ENOIOCTLCMD;
1008	break;
1009	}
1010	return err;
1011	}
1012	EXPORT_SYMBOL(inet_ioctl);
1013
1014	#ifdef CONFIG_COMPAT
1015	static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1016	struct compat_rtentry __user *ur)
1017	{
1018	compat_uptr_t rtdev;
1019	struct rtentry rt;
1020
1021	if (copy_from_user(to: &rt.rt_dst, from: &ur->rt_dst,
1022	n: 3 * sizeof(struct sockaddr)) ||
1023	get_user(rt.rt_flags, &ur->rt_flags) ||
1024	get_user(rt.rt_metric, &ur->rt_metric) ||
1025	get_user(rt.rt_mtu, &ur->rt_mtu) ||
1026	get_user(rt.rt_window, &ur->rt_window) ||
1027	get_user(rt.rt_irtt, &ur->rt_irtt) ||
1028	get_user(rtdev, &ur->rt_dev))
1029	return -EFAULT;
1030
1031	rt.rt_dev = compat_ptr(uptr: rtdev);
1032	return ip_rt_ioctl(sock_net(sk), cmd, rt: &rt);
1033	}
1034
1035	static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1036	{
1037	void __user *argp = compat_ptr(uptr: arg);
1038	struct sock *sk = sock->sk;
1039
1040	switch (cmd) {
1041	case SIOCADDRT:
1042	case SIOCDELRT:
1043	return inet_compat_routing_ioctl(sk, cmd, ur: argp);
1044	default:
1045	if (!sk->sk_prot->compat_ioctl)
1046	return -ENOIOCTLCMD;
1047	return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1048	}
1049	}
1050	#endif /* CONFIG_COMPAT */
1051
1052	const struct proto_ops inet_stream_ops = {
1053	.family = PF_INET,
1054	.owner = THIS_MODULE,
1055	.release = inet_release,
1056	.bind = inet_bind,
1057	.connect = inet_stream_connect,
1058	.socketpair = sock_no_socketpair,
1059	.accept = inet_accept,
1060	.getname = inet_getname,
1061	.poll = tcp_poll,
1062	.ioctl = inet_ioctl,
1063	.gettstamp = sock_gettstamp,
1064	.listen = inet_listen,
1065	.shutdown = inet_shutdown,
1066	.setsockopt = sock_common_setsockopt,
1067	.getsockopt = sock_common_getsockopt,
1068	.sendmsg = inet_sendmsg,
1069	.recvmsg = inet_recvmsg,
1070	#ifdef CONFIG_MMU
1071	.mmap = tcp_mmap,
1072	#endif
1073	.splice_eof = inet_splice_eof,
1074	.splice_read = tcp_splice_read,
1075	.set_peek_off = sk_set_peek_off,
1076	.read_sock = tcp_read_sock,
1077	.read_skb = tcp_read_skb,
1078	.sendmsg_locked = tcp_sendmsg_locked,
1079	.peek_len = tcp_peek_len,
1080	#ifdef CONFIG_COMPAT
1081	.compat_ioctl = inet_compat_ioctl,
1082	#endif
1083	.set_rcvlowat = tcp_set_rcvlowat,
1084	};
1085	EXPORT_SYMBOL(inet_stream_ops);
1086
1087	const struct proto_ops inet_dgram_ops = {
1088	.family = PF_INET,
1089	.owner = THIS_MODULE,
1090	.release = inet_release,
1091	.bind = inet_bind,
1092	.connect = inet_dgram_connect,
1093	.socketpair = sock_no_socketpair,
1094	.accept = sock_no_accept,
1095	.getname = inet_getname,
1096	.poll = udp_poll,
1097	.ioctl = inet_ioctl,
1098	.gettstamp = sock_gettstamp,
1099	.listen = sock_no_listen,
1100	.shutdown = inet_shutdown,
1101	.setsockopt = sock_common_setsockopt,
1102	.getsockopt = sock_common_getsockopt,
1103	.sendmsg = inet_sendmsg,
1104	.read_skb = udp_read_skb,
1105	.recvmsg = inet_recvmsg,
1106	.mmap = sock_no_mmap,
1107	.splice_eof = inet_splice_eof,
1108	.set_peek_off = udp_set_peek_off,
1109	#ifdef CONFIG_COMPAT
1110	.compat_ioctl = inet_compat_ioctl,
1111	#endif
1112	};
1113	EXPORT_SYMBOL(inet_dgram_ops);
1114
1115	/*
1116	* For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1117	* udp_poll
1118	*/
1119	static const struct proto_ops inet_sockraw_ops = {
1120	.family = PF_INET,
1121	.owner = THIS_MODULE,
1122	.release = inet_release,
1123	.bind = inet_bind,
1124	.connect = inet_dgram_connect,
1125	.socketpair = sock_no_socketpair,
1126	.accept = sock_no_accept,
1127	.getname = inet_getname,
1128	.poll = datagram_poll,
1129	.ioctl = inet_ioctl,
1130	.gettstamp = sock_gettstamp,
1131	.listen = sock_no_listen,
1132	.shutdown = inet_shutdown,
1133	.setsockopt = sock_common_setsockopt,
1134	.getsockopt = sock_common_getsockopt,
1135	.sendmsg = inet_sendmsg,
1136	.recvmsg = inet_recvmsg,
1137	.mmap = sock_no_mmap,
1138	.splice_eof = inet_splice_eof,
1139	#ifdef CONFIG_COMPAT
1140	.compat_ioctl = inet_compat_ioctl,
1141	#endif
1142	};
1143
1144	static const struct net_proto_family inet_family_ops = {
1145	.family = PF_INET,
1146	.create = inet_create,
1147	.owner = THIS_MODULE,
1148	};
1149
1150	/* Upon startup we insert all the elements in inetsw_array[] into
1151	* the linked list inetsw.
1152	*/
1153	static struct inet_protosw inetsw_array[] =
1154	{
1155	{
1156	.type = SOCK_STREAM,
1157	.protocol = IPPROTO_TCP,
1158	.prot = &tcp_prot,
1159	.ops = &inet_stream_ops,
1160	.flags = INET_PROTOSW_PERMANENT |
1161	INET_PROTOSW_ICSK,
1162	},
1163
1164	{
1165	.type = SOCK_DGRAM,
1166	.protocol = IPPROTO_UDP,
1167	.prot = &udp_prot,
1168	.ops = &inet_dgram_ops,
1169	.flags = INET_PROTOSW_PERMANENT,
1170	},
1171
1172	{
1173	.type = SOCK_DGRAM,
1174	.protocol = IPPROTO_ICMP,
1175	.prot = &ping_prot,
1176	.ops = &inet_sockraw_ops,
1177	.flags = INET_PROTOSW_REUSE,
1178	},
1179
1180	{
1181	.type = SOCK_RAW,
1182	.protocol = IPPROTO_IP, /* wild card */
1183	.prot = &raw_prot,
1184	.ops = &inet_sockraw_ops,
1185	.flags = INET_PROTOSW_REUSE,
1186	}
1187	};
1188
1189	#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1190
1191	void inet_register_protosw(struct inet_protosw *p)
1192	{
1193	struct list_head *lh;
1194	struct inet_protosw *answer;
1195	int protocol = p->protocol;
1196	struct list_head *last_perm;
1197
1198	spin_lock_bh(lock: &inetsw_lock);
1199
1200	if (p->type >= SOCK_MAX)
1201	goto out_illegal;
1202
1203	/* If we are trying to override a permanent protocol, bail. */
1204	last_perm = &inetsw[p->type];
1205	list_for_each(lh, &inetsw[p->type]) {
1206	answer = list_entry(lh, struct inet_protosw, list);
1207	/* Check only the non-wild match. */
1208	if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1209	break;
1210	if (protocol == answer->protocol)
1211	goto out_permanent;
1212	last_perm = lh;
1213	}
1214
1215	/* Add the new entry after the last permanent entry if any, so that
1216	* the new entry does not override a permanent entry when matched with
1217	* a wild-card protocol. But it is allowed to override any existing
1218	* non-permanent entry. This means that when we remove this entry, the
1219	* system automatically returns to the old behavior.
1220	*/
1221	list_add_rcu(new: &p->list, head: last_perm);
1222	out:
1223	spin_unlock_bh(lock: &inetsw_lock);
1224
1225	return;
1226
1227	out_permanent:
1228	pr_err("Attempt to override permanent protocol %d\n", protocol);
1229	goto out;
1230
1231	out_illegal:
1232	pr_err("Ignoring attempt to register invalid socket type %d\n",
1233	p->type);
1234	goto out;
1235	}
1236	EXPORT_SYMBOL(inet_register_protosw);
1237
1238	void inet_unregister_protosw(struct inet_protosw *p)
1239	{
1240	if (INET_PROTOSW_PERMANENT & p->flags) {
1241	pr_err("Attempt to unregister permanent protocol %d\n",
1242	p->protocol);
1243	} else {
1244	spin_lock_bh(lock: &inetsw_lock);
1245	list_del_rcu(entry: &p->list);
1246	spin_unlock_bh(lock: &inetsw_lock);
1247
1248	synchronize_net();
1249	}
1250	}
1251	EXPORT_SYMBOL(inet_unregister_protosw);
1252
1253	static int inet_sk_reselect_saddr(struct sock *sk)
1254	{
1255	struct inet_sock *inet = inet_sk(sk);
1256	__be32 old_saddr = inet->inet_saddr;
1257	__be32 daddr = inet->inet_daddr;
1258	struct flowi4 *fl4;
1259	struct rtable *rt;
1260	__be32 new_saddr;
1261	struct ip_options_rcu *inet_opt;
1262	int err;
1263
1264	inet_opt = rcu_dereference_protected(inet->inet_opt,
1265	lockdep_sock_is_held(sk));
1266	if (inet_opt && inet_opt->opt.srr)
1267	daddr = inet_opt->opt.faddr;
1268
1269	/* Query new route. */
1270	fl4 = &inet->cork.fl.u.ip4;
1271	rt = ip_route_connect(fl4, dst: daddr, src: 0, oif: sk->sk_bound_dev_if,
1272	protocol: sk->sk_protocol, sport: inet->inet_sport,
1273	dport: inet->inet_dport, sk);
1274	if (IS_ERR(ptr: rt))
1275	return PTR_ERR(ptr: rt);
1276
1277	new_saddr = fl4->saddr;
1278
1279	if (new_saddr == old_saddr) {
1280	sk_setup_caps(sk, dst: &rt->dst);
1281	return 0;
1282	}
1283
1284	err = inet_bhash2_update_saddr(sk, saddr: &new_saddr, AF_INET);
1285	if (err) {
1286	ip_rt_put(rt);
1287	return err;
1288	}
1289
1290	sk_setup_caps(sk, dst: &rt->dst);
1291
1292	if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1293	pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1294	__func__, &old_saddr, &new_saddr);
1295	}
1296
1297	/*
1298	* XXX The only one ugly spot where we need to
1299	* XXX really change the sockets identity after
1300	* XXX it has entered the hashes. -DaveM
1301	*
1302	* Besides that, it does not check for connection
1303	* uniqueness. Wait for troubles.
1304	*/
1305	return __sk_prot_rehash(sk);
1306	}
1307
1308	int inet_sk_rebuild_header(struct sock *sk)
1309	{
1310	struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1311	struct inet_sock *inet = inet_sk(sk);
1312	struct flowi4 *fl4;
1313	int err;
1314
1315	/* Route is OK, nothing to do. */
1316	if (rt)
1317	return 0;
1318
1319	/* Reroute. */
1320	fl4 = &inet->cork.fl.u.ip4;
1321	inet_sk_init_flowi4(inet, fl4);
1322	rt = ip_route_output_flow(sock_net(sk), flp: fl4, sk);
1323	if (!IS_ERR(ptr: rt)) {
1324	err = 0;
1325	sk_setup_caps(sk, dst: &rt->dst);
1326	} else {
1327	err = PTR_ERR(ptr: rt);
1328
1329	/* Routing failed... */
1330	sk->sk_route_caps = 0;
1331
1332	if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1333	sk->sk_state != TCP_SYN_SENT ||
1334	(sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1335	(err = inet_sk_reselect_saddr(sk)) != 0)
1336	WRITE_ONCE(sk->sk_err_soft, -err);
1337	}
1338
1339	return err;
1340	}
1341	EXPORT_SYMBOL(inet_sk_rebuild_header);
1342
1343	void inet_sk_set_state(struct sock *sk, int state)
1344	{
1345	trace_inet_sock_set_state(sk, oldstate: sk->sk_state, newstate: state);
1346	sk->sk_state = state;
1347	}
1348	EXPORT_SYMBOL(inet_sk_set_state);
1349
1350	void inet_sk_state_store(struct sock *sk, int newstate)
1351	{
1352	trace_inet_sock_set_state(sk, oldstate: sk->sk_state, newstate);
1353	smp_store_release(&sk->sk_state, newstate);
1354	}
1355
1356	struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1357	netdev_features_t features)
1358	{
1359	bool udpfrag = false, fixedid = false, gso_partial, encap;
1360	struct sk_buff *segs = ERR_PTR(error: -EINVAL);
1361	const struct net_offload *ops;
1362	unsigned int offset = 0;
1363	struct iphdr *iph;
1364	int proto, tot_len;
1365	int nhoff;
1366	int ihl;
1367	int id;
1368
1369	skb_reset_network_header(skb);
1370	nhoff = skb_network_header(skb) - skb_mac_header(skb);
1371	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1372	goto out;
1373
1374	iph = ip_hdr(skb);
1375	ihl = iph->ihl * 4;
1376	if (ihl < sizeof(*iph))
1377	goto out;
1378
1379	id = ntohs(iph->id);
1380	proto = iph->protocol;
1381
1382	/* Warning: after this point, iph might be no longer valid */
1383	if (unlikely(!pskb_may_pull(skb, ihl)))
1384	goto out;
1385	__skb_pull(skb, len: ihl);
1386
1387	encap = SKB_GSO_CB(skb)->encap_level > 0;
1388	if (encap)
1389	features &= skb->dev->hw_enc_features;
1390	SKB_GSO_CB(skb)->encap_level += ihl;
1391
1392	skb_reset_transport_header(skb);
1393
1394	segs = ERR_PTR(error: -EPROTONOSUPPORT);
1395
1396	if (!skb->encapsulation || encap) {
1397	udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1398	fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1399
1400	/* fixed ID is invalid if DF bit is not set */
1401	if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1402	goto out;
1403	}
1404
1405	ops = rcu_dereference(inet_offloads[proto]);
1406	if (likely(ops && ops->callbacks.gso_segment)) {
1407	segs = ops->callbacks.gso_segment(skb, features);
1408	if (!segs)
1409	skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1410	}
1411
1412	if (IS_ERR_OR_NULL(ptr: segs))
1413	goto out;
1414
1415	gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1416
1417	skb = segs;
1418	do {
1419	iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1420	if (udpfrag) {
1421	iph->frag_off = htons(offset >> 3);
1422	if (skb->next)
1423	iph->frag_off |= htons(IP_MF);
1424	offset += skb->len - nhoff - ihl;
1425	tot_len = skb->len - nhoff;
1426	} else if (skb_is_gso(skb)) {
1427	if (!fixedid) {
1428	iph->id = htons(id);
1429	id += skb_shinfo(skb)->gso_segs;
1430	}
1431
1432	if (gso_partial)
1433	tot_len = skb_shinfo(skb)->gso_size +
1434	SKB_GSO_CB(skb)->data_offset +
1435	skb->head - (unsigned char *)iph;
1436	else
1437	tot_len = skb->len - nhoff;
1438	} else {
1439	if (!fixedid)
1440	iph->id = htons(id++);
1441	tot_len = skb->len - nhoff;
1442	}
1443	iph->tot_len = htons(tot_len);
1444	ip_send_check(ip: iph);
1445	if (encap)
1446	skb_reset_inner_headers(skb);
1447	skb->network_header = (u8 *)iph - skb->head;
1448	skb_reset_mac_len(skb);
1449	} while ((skb = skb->next));
1450
1451	out:
1452	return segs;
1453	}
1454
1455	static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1456	netdev_features_t features)
1457	{
1458	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1459	return ERR_PTR(error: -EINVAL);
1460
1461	return inet_gso_segment(skb, features);
1462	}
1463
1464	struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1465	{
1466	const struct net_offload *ops;
1467	struct sk_buff *pp = NULL;
1468	const struct iphdr *iph;
1469	struct sk_buff *p;
1470	unsigned int hlen;
1471	unsigned int off;
1472	int flush = 1;
1473	int proto;
1474
1475	off = skb_gro_offset(skb);
1476	hlen = off + sizeof(*iph);
1477	iph = skb_gro_header(skb, hlen, offset: off);
1478	if (unlikely(!iph))
1479	goto out;
1480
1481	proto = iph->protocol;
1482
1483	ops = rcu_dereference(inet_offloads[proto]);
1484	if (!ops || !ops->callbacks.gro_receive)
1485	goto out;
1486
1487	if (*(u8 *)iph != 0x45)
1488	goto out;
1489
1490	if (ip_is_fragment(iph))
1491	goto out;
1492
1493	if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1494	goto out;
1495
1496	NAPI_GRO_CB(skb)->proto = proto;
1497	flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF));
1498
1499	list_for_each_entry(p, head, list) {
1500	struct iphdr *iph2;
1501
1502	if (!NAPI_GRO_CB(p)->same_flow)
1503	continue;
1504
1505	iph2 = (struct iphdr *)(p->data + off);
1506	/* The above works because, with the exception of the top
1507	* (inner most) layer, we only aggregate pkts with the same
1508	* hdr length so all the hdrs we'll need to verify will start
1509	* at the same offset.
1510	*/
1511	if ((iph->protocol ^ iph2->protocol) |
1512	((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1513	((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1514	NAPI_GRO_CB(p)->same_flow = 0;
1515	continue;
1516	}
1517	}
1518
1519	NAPI_GRO_CB(skb)->flush |= flush;
1520	NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off;
1521
1522	/* Note : No need to call skb_gro_postpull_rcsum() here,
1523	* as we already checked checksum over ipv4 header was 0
1524	*/
1525	skb_gro_pull(skb, len: sizeof(*iph));
1526	skb_set_transport_header(skb, offset: skb_gro_offset(skb));
1527
1528	pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1529	ops->callbacks.gro_receive, head, skb);
1530
1531	out:
1532	skb_gro_flush_final(skb, pp, flush);
1533
1534	return pp;
1535	}
1536
1537	static struct sk_buff *ipip_gro_receive(struct list_head *head,
1538	struct sk_buff *skb)
1539	{
1540	if (NAPI_GRO_CB(skb)->encap_mark) {
1541	NAPI_GRO_CB(skb)->flush = 1;
1542	return NULL;
1543	}
1544
1545	NAPI_GRO_CB(skb)->encap_mark = 1;
1546
1547	return inet_gro_receive(head, skb);
1548	}
1549
1550	#define SECONDS_PER_DAY 86400
1551
1552	/* inet_current_timestamp - Return IP network timestamp
1553	*
1554	* Return milliseconds since midnight in network byte order.
1555	*/
1556	__be32 inet_current_timestamp(void)
1557	{
1558	u32 secs;
1559	u32 msecs;
1560	struct timespec64 ts;
1561
1562	ktime_get_real_ts64(tv: &ts);
1563
1564	/* Get secs since midnight. */
1565	(void)div_u64_rem(dividend: ts.tv_sec, SECONDS_PER_DAY, remainder: &secs);
1566	/* Convert to msecs. */
1567	msecs = secs * MSEC_PER_SEC;
1568	/* Convert nsec to msec. */
1569	msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1570
1571	/* Convert to network byte order. */
1572	return htonl(msecs);
1573	}
1574	EXPORT_SYMBOL(inet_current_timestamp);
1575
1576	int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1577	{
1578	unsigned int family = READ_ONCE(sk->sk_family);
1579
1580	if (family == AF_INET)
1581	return ip_recv_error(sk, msg, len, addr_len);
1582	#if IS_ENABLED(CONFIG_IPV6)
1583	if (family == AF_INET6)
1584	return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1585	#endif
1586	return -EINVAL;
1587	}
1588	EXPORT_SYMBOL(inet_recv_error);
1589
1590	int inet_gro_complete(struct sk_buff *skb, int nhoff)
1591	{
1592	struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1593	const struct net_offload *ops;
1594	__be16 totlen = iph->tot_len;
1595	int proto = iph->protocol;
1596	int err = -ENOSYS;
1597
1598	if (skb->encapsulation) {
1599	skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1600	skb_set_inner_network_header(skb, offset: nhoff);
1601	}
1602
1603	iph_set_totlen(iph, len: skb->len - nhoff);
1604	csum_replace2(sum: &iph->check, old: totlen, new: iph->tot_len);
1605
1606	ops = rcu_dereference(inet_offloads[proto]);
1607	if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1608	goto out;
1609
1610	/* Only need to add sizeof(*iph) to get to the next hdr below
1611	* because any hdr with option will have been flushed in
1612	* inet_gro_receive().
1613	*/
1614	err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1615	tcp4_gro_complete, udp4_gro_complete,
1616	skb, nhoff + sizeof(*iph));
1617
1618	out:
1619	return err;
1620	}
1621
1622	static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1623	{
1624	skb->encapsulation = 1;
1625	skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1626	return inet_gro_complete(skb, nhoff);
1627	}
1628
1629	int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1630	unsigned short type, unsigned char protocol,
1631	struct net *net)
1632	{
1633	struct socket *sock;
1634	int rc = sock_create_kern(net, family, type, proto: protocol, res: &sock);
1635
1636	if (rc == 0) {
1637	*sk = sock->sk;
1638	(*sk)->sk_allocation = GFP_ATOMIC;
1639	(*sk)->sk_use_task_frag = false;
1640	/*
1641	* Unhash it so that IP input processing does not even see it,
1642	* we do not wish this socket to see incoming packets.
1643	*/
1644	(*sk)->sk_prot->unhash(*sk);
1645	}
1646	return rc;
1647	}
1648	EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1649
1650	unsigned long snmp_fold_field(void __percpu *mib, int offt)
1651	{
1652	unsigned long res = 0;
1653	int i;
1654
1655	for_each_possible_cpu(i)
1656	res += snmp_get_cpu_field(mib, cpu: i, offt);
1657	return res;
1658	}
1659	EXPORT_SYMBOL_GPL(snmp_fold_field);
1660
1661	#if BITS_PER_LONG==32
1662
1663	u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1664	size_t syncp_offset)
1665	{
1666	void *bhptr;
1667	struct u64_stats_sync *syncp;
1668	u64 v;
1669	unsigned int start;
1670
1671	bhptr = per_cpu_ptr(mib, cpu);
1672	syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1673	do {
1674	start = u64_stats_fetch_begin(syncp);
1675	v = *(((u64 *)bhptr) + offt);
1676	} while (u64_stats_fetch_retry(syncp, start));
1677
1678	return v;
1679	}
1680	EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1681
1682	u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1683	{
1684	u64 res = 0;
1685	int cpu;
1686
1687	for_each_possible_cpu(cpu) {
1688	res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1689	}
1690	return res;
1691	}
1692	EXPORT_SYMBOL_GPL(snmp_fold_field64);
1693	#endif
1694
1695	#ifdef CONFIG_IP_MULTICAST
1696	static const struct net_protocol igmp_protocol = {
1697	.handler = igmp_rcv,
1698	};
1699	#endif
1700
1701	static const struct net_protocol icmp_protocol = {
1702	.handler = icmp_rcv,
1703	.err_handler = icmp_err,
1704	.no_policy = 1,
1705	};
1706
1707	static __net_init int ipv4_mib_init_net(struct net *net)
1708	{
1709	int i;
1710
1711	net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1712	if (!net->mib.tcp_statistics)
1713	goto err_tcp_mib;
1714	net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1715	if (!net->mib.ip_statistics)
1716	goto err_ip_mib;
1717
1718	for_each_possible_cpu(i) {
1719	struct ipstats_mib *af_inet_stats;
1720	af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1721	u64_stats_init(syncp: &af_inet_stats->syncp);
1722	}
1723
1724	net->mib.net_statistics = alloc_percpu(struct linux_mib);
1725	if (!net->mib.net_statistics)
1726	goto err_net_mib;
1727	net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1728	if (!net->mib.udp_statistics)
1729	goto err_udp_mib;
1730	net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1731	if (!net->mib.udplite_statistics)
1732	goto err_udplite_mib;
1733	net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1734	if (!net->mib.icmp_statistics)
1735	goto err_icmp_mib;
1736	net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1737	GFP_KERNEL);
1738	if (!net->mib.icmpmsg_statistics)
1739	goto err_icmpmsg_mib;
1740
1741	tcp_mib_init(net);
1742	return 0;
1743
1744	err_icmpmsg_mib:
1745	free_percpu(pdata: net->mib.icmp_statistics);
1746	err_icmp_mib:
1747	free_percpu(pdata: net->mib.udplite_statistics);
1748	err_udplite_mib:
1749	free_percpu(pdata: net->mib.udp_statistics);
1750	err_udp_mib:
1751	free_percpu(pdata: net->mib.net_statistics);
1752	err_net_mib:
1753	free_percpu(pdata: net->mib.ip_statistics);
1754	err_ip_mib:
1755	free_percpu(pdata: net->mib.tcp_statistics);
1756	err_tcp_mib:
1757	return -ENOMEM;
1758	}
1759
1760	static __net_exit void ipv4_mib_exit_net(struct net *net)
1761	{
1762	kfree(objp: net->mib.icmpmsg_statistics);
1763	free_percpu(pdata: net->mib.icmp_statistics);
1764	free_percpu(pdata: net->mib.udplite_statistics);
1765	free_percpu(pdata: net->mib.udp_statistics);
1766	free_percpu(pdata: net->mib.net_statistics);
1767	free_percpu(pdata: net->mib.ip_statistics);
1768	free_percpu(pdata: net->mib.tcp_statistics);
1769	#ifdef CONFIG_MPTCP
1770	/* allocated on demand, see mptcp_init_sock() */
1771	free_percpu(pdata: net->mib.mptcp_statistics);
1772	#endif
1773	}
1774
1775	static __net_initdata struct pernet_operations ipv4_mib_ops = {
1776	.init = ipv4_mib_init_net,
1777	.exit = ipv4_mib_exit_net,
1778	};
1779
1780	static int __init init_ipv4_mibs(void)
1781	{
1782	return register_pernet_subsys(&ipv4_mib_ops);
1783	}
1784
1785	static __net_init int inet_init_net(struct net *net)
1786	{
1787	/*
1788	* Set defaults for local port range
1789	*/
1790	net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1791
1792	seqlock_init(&net->ipv4.ping_group_range.lock);
1793	/*
1794	* Sane defaults - nobody may create ping sockets.
1795	* Boot scripts should set this to distro-specific group.
1796	*/
1797	net->ipv4.ping_group_range.range[0] = make_kgid(from: &init_user_ns, gid: 1);
1798	net->ipv4.ping_group_range.range[1] = make_kgid(from: &init_user_ns, gid: 0);
1799
1800	/* Default values for sysctl-controlled parameters.
1801	* We set them here, in case sysctl is not compiled.
1802	*/
1803	net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1804	net->ipv4.sysctl_ip_fwd_update_priority = 1;
1805	net->ipv4.sysctl_ip_dynaddr = 0;
1806	net->ipv4.sysctl_ip_early_demux = 1;
1807	net->ipv4.sysctl_udp_early_demux = 1;
1808	net->ipv4.sysctl_tcp_early_demux = 1;
1809	net->ipv4.sysctl_nexthop_compat_mode = 1;
1810	#ifdef CONFIG_SYSCTL
1811	net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1812	#endif
1813
1814	/* Some igmp sysctl, whose values are always used */
1815	net->ipv4.sysctl_igmp_max_memberships = 20;
1816	net->ipv4.sysctl_igmp_max_msf = 10;
1817	/* IGMP reports for link-local multicast groups are enabled by default */
1818	net->ipv4.sysctl_igmp_llm_reports = 1;
1819	net->ipv4.sysctl_igmp_qrv = 2;
1820
1821	net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1822
1823	return 0;
1824	}
1825
1826	static __net_initdata struct pernet_operations af_inet_ops = {
1827	.init = inet_init_net,
1828	};
1829
1830	static int __init init_inet_pernet_ops(void)
1831	{
1832	return register_pernet_subsys(&af_inet_ops);
1833	}
1834
1835	static int ipv4_proc_init(void);
1836
1837	/*
1838	* IP protocol layer initialiser
1839	*/
1840
1841
1842	static const struct net_offload ipip_offload = {
1843	.callbacks = {
1844	.gso_segment = ipip_gso_segment,
1845	.gro_receive = ipip_gro_receive,
1846	.gro_complete = ipip_gro_complete,
1847	},
1848	};
1849
1850	static int __init ipip_offload_init(void)
1851	{
1852	return inet_add_offload(prot: &ipip_offload, IPPROTO_IPIP);
1853	}
1854
1855	static int __init ipv4_offload_init(void)
1856	{
1857	/*
1858	* Add offloads
1859	*/
1860	if (udpv4_offload_init() < 0)
1861	pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1862	if (tcpv4_offload_init() < 0)
1863	pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1864	if (ipip_offload_init() < 0)
1865	pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1866
1867	net_hotdata.ip_packet_offload = (struct packet_offload) {
1868	.type = cpu_to_be16(ETH_P_IP),
1869	.callbacks = {
1870	.gso_segment = inet_gso_segment,
1871	.gro_receive = inet_gro_receive,
1872	.gro_complete = inet_gro_complete,
1873	},
1874	};
1875	dev_add_offload(po: &net_hotdata.ip_packet_offload);
1876	return 0;
1877	}
1878
1879	fs_initcall(ipv4_offload_init);
1880
1881	static struct packet_type ip_packet_type __read_mostly = {
1882	.type = cpu_to_be16(ETH_P_IP),
1883	.func = ip_rcv,
1884	.list_func = ip_list_rcv,
1885	};
1886
1887	static int __init inet_init(void)
1888	{
1889	struct inet_protosw *q;
1890	struct list_head *r;
1891	int rc;
1892
1893	sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1894
1895	raw_hashinfo_init(hashinfo: &raw_v4_hashinfo);
1896
1897	rc = proto_register(prot: &tcp_prot, alloc_slab: 1);
1898	if (rc)
1899	goto out;
1900
1901	rc = proto_register(prot: &udp_prot, alloc_slab: 1);
1902	if (rc)
1903	goto out_unregister_tcp_proto;
1904
1905	rc = proto_register(prot: &raw_prot, alloc_slab: 1);
1906	if (rc)
1907	goto out_unregister_udp_proto;
1908
1909	rc = proto_register(prot: &ping_prot, alloc_slab: 1);
1910	if (rc)
1911	goto out_unregister_raw_proto;
1912
1913	/*
1914	* Tell SOCKET that we are alive...
1915	*/
1916
1917	(void)sock_register(fam: &inet_family_ops);
1918
1919	#ifdef CONFIG_SYSCTL
1920	ip_static_sysctl_init();
1921	#endif
1922
1923	/*
1924	* Add all the base protocols.
1925	*/
1926
1927	if (inet_add_protocol(prot: &icmp_protocol, IPPROTO_ICMP) < 0)
1928	pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1929
1930	net_hotdata.udp_protocol = (struct net_protocol) {
1931	.handler = udp_rcv,
1932	.err_handler = udp_err,
1933	.no_policy = 1,
1934	};
1935	if (inet_add_protocol(prot: &net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1936	pr_crit("%s: Cannot add UDP protocol\n", __func__);
1937
1938	net_hotdata.tcp_protocol = (struct net_protocol) {
1939	.handler = tcp_v4_rcv,
1940	.err_handler = tcp_v4_err,
1941	.no_policy = 1,
1942	.icmp_strict_tag_validation = 1,
1943	};
1944	if (inet_add_protocol(prot: &net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
1945	pr_crit("%s: Cannot add TCP protocol\n", __func__);
1946	#ifdef CONFIG_IP_MULTICAST
1947	if (inet_add_protocol(prot: &igmp_protocol, IPPROTO_IGMP) < 0)
1948	pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1949	#endif
1950
1951	/* Register the socket-side information for inet_create. */
1952	for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1953	INIT_LIST_HEAD(list: r);
1954
1955	for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1956	inet_register_protosw(q);
1957
1958	/*
1959	* Set the ARP module up
1960	*/
1961
1962	arp_init();
1963
1964	/*
1965	* Set the IP module up
1966	*/
1967
1968	ip_init();
1969
1970	/* Initialise per-cpu ipv4 mibs */
1971	if (init_ipv4_mibs())
1972	panic(fmt: "%s: Cannot init ipv4 mibs\n", __func__);
1973
1974	/* Setup TCP slab cache for open requests. */
1975	tcp_init();
1976
1977	/* Setup UDP memory threshold */
1978	udp_init();
1979
1980	/* Add UDP-Lite (RFC 3828) */
1981	udplite4_register();
1982
1983	raw_init();
1984
1985	ping_init();
1986
1987	/*
1988	* Set the ICMP layer up
1989	*/
1990
1991	if (icmp_init() < 0)
1992	panic(fmt: "Failed to create the ICMP control socket.\n");
1993
1994	/*
1995	* Initialise the multicast router
1996	*/
1997	#if defined(CONFIG_IP_MROUTE)
1998	if (ip_mr_init())
1999	pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2000	#endif
2001
2002	if (init_inet_pernet_ops())
2003	pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2004
2005	ipv4_proc_init();
2006
2007	ipfrag_init();
2008
2009	dev_add_pack(pt: &ip_packet_type);
2010
2011	ip_tunnel_core_init();
2012
2013	rc = 0;
2014	out:
2015	return rc;
2016	out_unregister_raw_proto:
2017	proto_unregister(prot: &raw_prot);
2018	out_unregister_udp_proto:
2019	proto_unregister(prot: &udp_prot);
2020	out_unregister_tcp_proto:
2021	proto_unregister(prot: &tcp_prot);
2022	goto out;
2023	}
2024
2025	fs_initcall(inet_init);
2026
2027	/* ------------------------------------------------------------------------ */
2028
2029	#ifdef CONFIG_PROC_FS
2030	static int __init ipv4_proc_init(void)
2031	{
2032	int rc = 0;
2033
2034	if (raw_proc_init())
2035	goto out_raw;
2036	if (tcp4_proc_init())
2037	goto out_tcp;
2038	if (udp4_proc_init())
2039	goto out_udp;
2040	if (ping_proc_init())
2041	goto out_ping;
2042	if (ip_misc_proc_init())
2043	goto out_misc;
2044	out:
2045	return rc;
2046	out_misc:
2047	ping_proc_exit();
2048	out_ping:
2049	udp4_proc_exit();
2050	out_udp:
2051	tcp4_proc_exit();
2052	out_tcp:
2053	raw_proc_exit();
2054	out_raw:
2055	rc = -ENOMEM;
2056	goto out;
2057	}
2058
2059	#else /* CONFIG_PROC_FS */
2060	static int __init ipv4_proc_init(void)
2061	{
2062	return 0;
2063	}
2064	#endif /* CONFIG_PROC_FS */
2065