1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* linux/net/sunrpc/xprtsock.c
4	*
5	* Client-side transport implementation for sockets.
6	*
7	* TCP callback races fixes (C) 1998 Red Hat
8	* TCP send fixes (C) 1998 Red Hat
9	* TCP NFS related read + write fixes
10	* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11	*
12	* Rewrite of larges part of the code in order to stabilize TCP stuff.
13	* Fix behaviour when socket buffer is full.
14	* (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15	*
16	* IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17	*
18	* IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19	* <gilles.quillard@bull.net>
20	*/
21
22	#include <linux/types.h>
23	#include <linux/string.h>
24	#include <linux/slab.h>
25	#include <linux/module.h>
26	#include <linux/capability.h>
27	#include <linux/pagemap.h>
28	#include <linux/errno.h>
29	#include <linux/socket.h>
30	#include <linux/in.h>
31	#include <linux/net.h>
32	#include <linux/mm.h>
33	#include <linux/un.h>
34	#include <linux/udp.h>
35	#include <linux/tcp.h>
36	#include <linux/sunrpc/clnt.h>
37	#include <linux/sunrpc/addr.h>
38	#include <linux/sunrpc/sched.h>
39	#include <linux/sunrpc/svcsock.h>
40	#include <linux/sunrpc/xprtsock.h>
41	#include <linux/file.h>
42	#ifdef CONFIG_SUNRPC_BACKCHANNEL
43	#include <linux/sunrpc/bc_xprt.h>
44	#endif
45
46	#include <net/sock.h>
47	#include <net/checksum.h>
48	#include <net/udp.h>
49	#include <net/tcp.h>
50	#include <net/tls_prot.h>
51	#include <net/handshake.h>
52
53	#include <linux/bvec.h>
54	#include <linux/highmem.h>
55	#include <linux/uio.h>
56	#include <linux/sched/mm.h>
57
58	#include <trace/events/sock.h>
59	#include <trace/events/sunrpc.h>
60
61	#include "socklib.h"
62	#include "sunrpc.h"
63
64	static void xs_close(struct rpc_xprt *xprt);
65	static void xs_reset_srcport(struct sock_xprt *transport);
66	static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
67	static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
68	struct socket *sock);
69
70	/*
71	* xprtsock tunables
72	*/
73	static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
74	static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
75	static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
76
77	static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
78	static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
79
80	#define XS_TCP_LINGER_TO (15U * HZ)
81	static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
82
83	/*
84	* We can register our own files under /proc/sys/sunrpc by
85	* calling register_sysctl() again. The files in that
86	* directory become the union of all files registered there.
87	*
88	* We simply need to make sure that we don't collide with
89	* someone else's file names!
90	*/
91
92	static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
93	static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
94	static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
95	static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
96	static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
97
98	static struct ctl_table_header *sunrpc_table_header;
99
100	static struct xprt_class xs_local_transport;
101	static struct xprt_class xs_udp_transport;
102	static struct xprt_class xs_tcp_transport;
103	static struct xprt_class xs_tcp_tls_transport;
104	static struct xprt_class xs_bc_tcp_transport;
105
106	/*
107	* FIXME: changing the UDP slot table size should also resize the UDP
108	* socket buffers for existing UDP transports
109	*/
110	static struct ctl_table xs_tunables_table[] = {
111	{
112	.procname = "udp_slot_table_entries",
113	.data = &xprt_udp_slot_table_entries,
114	.maxlen = sizeof(unsigned int),
115	.mode = 0644,
116	.proc_handler = proc_dointvec_minmax,
117	.extra1 = &min_slot_table_size,
118	.extra2 = &max_slot_table_size
119	},
120	{
121	.procname = "tcp_slot_table_entries",
122	.data = &xprt_tcp_slot_table_entries,
123	.maxlen = sizeof(unsigned int),
124	.mode = 0644,
125	.proc_handler = proc_dointvec_minmax,
126	.extra1 = &min_slot_table_size,
127	.extra2 = &max_slot_table_size
128	},
129	{
130	.procname = "tcp_max_slot_table_entries",
131	.data = &xprt_max_tcp_slot_table_entries,
132	.maxlen = sizeof(unsigned int),
133	.mode = 0644,
134	.proc_handler = proc_dointvec_minmax,
135	.extra1 = &min_slot_table_size,
136	.extra2 = &max_tcp_slot_table_limit
137	},
138	{
139	.procname = "min_resvport",
140	.data = &xprt_min_resvport,
141	.maxlen = sizeof(unsigned int),
142	.mode = 0644,
143	.proc_handler = proc_dointvec_minmax,
144	.extra1 = &xprt_min_resvport_limit,
145	.extra2 = &xprt_max_resvport_limit
146	},
147	{
148	.procname = "max_resvport",
149	.data = &xprt_max_resvport,
150	.maxlen = sizeof(unsigned int),
151	.mode = 0644,
152	.proc_handler = proc_dointvec_minmax,
153	.extra1 = &xprt_min_resvport_limit,
154	.extra2 = &xprt_max_resvport_limit
155	},
156	{
157	.procname = "tcp_fin_timeout",
158	.data = &xs_tcp_fin_timeout,
159	.maxlen = sizeof(xs_tcp_fin_timeout),
160	.mode = 0644,
161	.proc_handler = proc_dointvec_jiffies,
162	},
163	{ },
164	};
165
166	/*
167	* Wait duration for a reply from the RPC portmapper.
168	*/
169	#define XS_BIND_TO (60U * HZ)
170
171	/*
172	* Delay if a UDP socket connect error occurs. This is most likely some
173	* kind of resource problem on the local host.
174	*/
175	#define XS_UDP_REEST_TO (2U * HZ)
176
177	/*
178	* The reestablish timeout allows clients to delay for a bit before attempting
179	* to reconnect to a server that just dropped our connection.
180	*
181	* We implement an exponential backoff when trying to reestablish a TCP
182	* transport connection with the server. Some servers like to drop a TCP
183	* connection when they are overworked, so we start with a short timeout and
184	* increase over time if the server is down or not responding.
185	*/
186	#define XS_TCP_INIT_REEST_TO (3U * HZ)
187
188	/*
189	* TCP idle timeout; client drops the transport socket if it is idle
190	* for this long. Note that we also timeout UDP sockets to prevent
191	* holding port numbers when there is no RPC traffic.
192	*/
193	#define XS_IDLE_DISC_TO (5U * 60 * HZ)
194
195	/*
196	* TLS handshake timeout.
197	*/
198	#define XS_TLS_HANDSHAKE_TO (10U * HZ)
199
200	#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
201	# undef RPC_DEBUG_DATA
202	# define RPCDBG_FACILITY RPCDBG_TRANS
203	#endif
204
205	#ifdef RPC_DEBUG_DATA
206	static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207	{
208	u8 *buf = (u8 *) packet;
209	int j;
210
211	dprintk("RPC: %s\n", msg);
212	for (j = 0; j < count && j < 128; j += 4) {
213	if (!(j & 31)) {
214	if (j)
215	dprintk("\n");
216	dprintk("0x%04x ", j);
217	}
218	dprintk("%02x%02x%02x%02x ",
219	buf[j], buf[j+1], buf[j+2], buf[j+3]);
220	}
221	dprintk("\n");
222	}
223	#else
224	static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
225	{
226	/* NOP */
227	}
228	#endif
229
230	static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
231	{
232	return (struct rpc_xprt *) sk->sk_user_data;
233	}
234
235	static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
236	{
237	return (struct sockaddr *) &xprt->addr;
238	}
239
240	static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
241	{
242	return (struct sockaddr_un *) &xprt->addr;
243	}
244
245	static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
246	{
247	return (struct sockaddr_in *) &xprt->addr;
248	}
249
250	static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
251	{
252	return (struct sockaddr_in6 *) &xprt->addr;
253	}
254
255	static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
256	{
257	struct sockaddr *sap = xs_addr(xprt);
258	struct sockaddr_in6 *sin6;
259	struct sockaddr_in *sin;
260	struct sockaddr_un *sun;
261	char buf[128];
262
263	switch (sap->sa_family) {
264	case AF_LOCAL:
265	sun = xs_addr_un(xprt);
266	if (sun->sun_path[0]) {
267	strscpy(buf, sun->sun_path, sizeof(buf));
268	} else {
269	buf[0] = '@';
270	strscpy(buf+1, sun->sun_path+1, sizeof(buf)-1);
271	}
272	xprt->address_strings[RPC_DISPLAY_ADDR] =
273	kstrdup(s: buf, GFP_KERNEL);
274	break;
275	case AF_INET:
276	(void)rpc_ntop(sap, buf, sizeof(buf));
277	xprt->address_strings[RPC_DISPLAY_ADDR] =
278	kstrdup(s: buf, GFP_KERNEL);
279	sin = xs_addr_in(xprt);
280	snprintf(buf, size: sizeof(buf), fmt: "%08x", ntohl(sin->sin_addr.s_addr));
281	break;
282	case AF_INET6:
283	(void)rpc_ntop(sap, buf, sizeof(buf));
284	xprt->address_strings[RPC_DISPLAY_ADDR] =
285	kstrdup(s: buf, GFP_KERNEL);
286	sin6 = xs_addr_in6(xprt);
287	snprintf(buf, size: sizeof(buf), fmt: "%pi6", &sin6->sin6_addr);
288	break;
289	default:
290	BUG();
291	}
292
293	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(s: buf, GFP_KERNEL);
294	}
295
296	static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
297	{
298	struct sockaddr *sap = xs_addr(xprt);
299	char buf[128];
300
301	snprintf(buf, size: sizeof(buf), fmt: "%u", rpc_get_port(sap));
302	xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(s: buf, GFP_KERNEL);
303
304	snprintf(buf, size: sizeof(buf), fmt: "%4hx", rpc_get_port(sap));
305	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(s: buf, GFP_KERNEL);
306	}
307
308	static void xs_format_peer_addresses(struct rpc_xprt *xprt,
309	const char *protocol,
310	const char *netid)
311	{
312	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
313	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
314	xs_format_common_peer_addresses(xprt);
315	xs_format_common_peer_ports(xprt);
316	}
317
318	static void xs_update_peer_port(struct rpc_xprt *xprt)
319	{
320	kfree(objp: xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
321	kfree(objp: xprt->address_strings[RPC_DISPLAY_PORT]);
322
323	xs_format_common_peer_ports(xprt);
324	}
325
326	static void xs_free_peer_addresses(struct rpc_xprt *xprt)
327	{
328	unsigned int i;
329
330	for (i = 0; i < RPC_DISPLAY_MAX; i++)
331	switch (i) {
332	case RPC_DISPLAY_PROTO:
333	case RPC_DISPLAY_NETID:
334	continue;
335	default:
336	kfree(objp: xprt->address_strings[i]);
337	}
338	}
339
340	static size_t
341	xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
342	{
343	size_t i,n;
344
345	if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
346	return want;
347	n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
348	for (i = 0; i < n; i++) {
349	if (buf->pages[i])
350	continue;
351	buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
352	if (!buf->pages[i]) {
353	i *= PAGE_SIZE;
354	return i > buf->page_base ? i - buf->page_base : 0;
355	}
356	}
357	return want;
358	}
359
360	static int
361	xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
362	struct cmsghdr *cmsg, int ret)
363	{
364	u8 content_type = tls_get_record_type(sk: sock->sk, msg: cmsg);
365	u8 level, description;
366
367	switch (content_type) {
368	case 0:
369	break;
370	case TLS_RECORD_TYPE_DATA:
371	/* TLS sets EOR at the end of each application data
372	* record, even though there might be more frames
373	* waiting to be decrypted.
374	*/
375	msg->msg_flags &= ~MSG_EOR;
376	break;
377	case TLS_RECORD_TYPE_ALERT:
378	tls_alert_recv(sk: sock->sk, msg, level: &level, description: &description);
379	ret = (level == TLS_ALERT_LEVEL_FATAL) ?
380	-EACCES : -EAGAIN;
381	break;
382	default:
383	/* discard this record type */
384	ret = -EAGAIN;
385	}
386	return ret;
387	}
388
389	static int
390	xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags)
391	{
392	union {
393	struct cmsghdr cmsg;
394	u8 buf[CMSG_SPACE(sizeof(u8))];
395	} u;
396	int ret;
397
398	msg->msg_control = &u;
399	msg->msg_controllen = sizeof(u);
400	ret = sock_recvmsg(sock, msg, flags);
401	if (msg->msg_controllen != sizeof(u))
402	ret = xs_sock_process_cmsg(sock, msg, cmsg: &u.cmsg, ret);
403	return ret;
404	}
405
406	static ssize_t
407	xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
408	{
409	ssize_t ret;
410	if (seek != 0)
411	iov_iter_advance(i: &msg->msg_iter, bytes: seek);
412	ret = xs_sock_recv_cmsg(sock, msg, flags);
413	return ret > 0 ? ret + seek : ret;
414	}
415
416	static ssize_t
417	xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
418	struct kvec *kvec, size_t count, size_t seek)
419	{
420	iov_iter_kvec(i: &msg->msg_iter, ITER_DEST, kvec, nr_segs: 1, count);
421	return xs_sock_recvmsg(sock, msg, flags, seek);
422	}
423
424	static ssize_t
425	xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
426	struct bio_vec *bvec, unsigned long nr, size_t count,
427	size_t seek)
428	{
429	iov_iter_bvec(i: &msg->msg_iter, ITER_DEST, bvec, nr_segs: nr, count);
430	return xs_sock_recvmsg(sock, msg, flags, seek);
431	}
432
433	static ssize_t
434	xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
435	size_t count)
436	{
437	iov_iter_discard(i: &msg->msg_iter, ITER_DEST, count);
438	return xs_sock_recv_cmsg(sock, msg, flags);
439	}
440
441	#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
442	static void
443	xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
444	{
445	struct bvec_iter bi = {
446	.bi_size = count,
447	};
448	struct bio_vec bv;
449
450	bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
451	for_each_bvec(bv, bvec, bi, bi)
452	flush_dcache_page(bv.bv_page);
453	}
454	#else
455	static inline void
456	xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
457	{
458	}
459	#endif
460
461	static ssize_t
462	xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
463	struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
464	{
465	size_t want, seek_init = seek, offset = 0;
466	ssize_t ret;
467
468	want = min_t(size_t, count, buf->head[0].iov_len);
469	if (seek < want) {
470	ret = xs_read_kvec(sock, msg, flags, kvec: &buf->head[0], count: want, seek);
471	if (ret <= 0)
472	goto sock_err;
473	offset += ret;
474	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
475	goto out;
476	if (ret != want)
477	goto out;
478	seek = 0;
479	} else {
480	seek -= want;
481	offset += want;
482	}
483
484	want = xs_alloc_sparse_pages(
485	buf, min_t(size_t, count - offset, buf->page_len),
486	GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
487	if (seek < want) {
488	ret = xs_read_bvec(sock, msg, flags, bvec: buf->bvec,
489	nr: xdr_buf_pagecount(buf),
490	count: want + buf->page_base,
491	seek: seek + buf->page_base);
492	if (ret <= 0)
493	goto sock_err;
494	xs_flush_bvec(bvec: buf->bvec, count: ret, seek: seek + buf->page_base);
495	ret -= buf->page_base;
496	offset += ret;
497	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
498	goto out;
499	if (ret != want)
500	goto out;
501	seek = 0;
502	} else {
503	seek -= want;
504	offset += want;
505	}
506
507	want = min_t(size_t, count - offset, buf->tail[0].iov_len);
508	if (seek < want) {
509	ret = xs_read_kvec(sock, msg, flags, kvec: &buf->tail[0], count: want, seek);
510	if (ret <= 0)
511	goto sock_err;
512	offset += ret;
513	if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
514	goto out;
515	if (ret != want)
516	goto out;
517	} else if (offset < seek_init)
518	offset = seek_init;
519	ret = -EMSGSIZE;
520	out:
521	*read = offset - seek_init;
522	return ret;
523	sock_err:
524	offset += seek;
525	goto out;
526	}
527
528	static void
529	xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
530	{
531	if (!transport->recv.copied) {
532	if (buf->head[0].iov_len >= transport->recv.offset)
533	memcpy(buf->head[0].iov_base,
534	&transport->recv.xid,
535	transport->recv.offset);
536	transport->recv.copied = transport->recv.offset;
537	}
538	}
539
540	static bool
541	xs_read_stream_request_done(struct sock_xprt *transport)
542	{
543	return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
544	}
545
546	static void
547	xs_read_stream_check_eor(struct sock_xprt *transport,
548	struct msghdr *msg)
549	{
550	if (xs_read_stream_request_done(transport))
551	msg->msg_flags |= MSG_EOR;
552	}
553
554	static ssize_t
555	xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
556	int flags, struct rpc_rqst *req)
557	{
558	struct xdr_buf *buf = &req->rq_private_buf;
559	size_t want, read;
560	ssize_t ret;
561
562	xs_read_header(transport, buf);
563
564	want = transport->recv.len - transport->recv.offset;
565	if (want != 0) {
566	ret = xs_read_xdr_buf(sock: transport->sock, msg, flags, buf,
567	count: transport->recv.copied + want,
568	seek: transport->recv.copied,
569	read: &read);
570	transport->recv.offset += read;
571	transport->recv.copied += read;
572	}
573
574	if (transport->recv.offset == transport->recv.len)
575	xs_read_stream_check_eor(transport, msg);
576
577	if (want == 0)
578	return 0;
579
580	switch (ret) {
581	default:
582	break;
583	case -EFAULT:
584	case -EMSGSIZE:
585	msg->msg_flags |= MSG_TRUNC;
586	return read;
587	case 0:
588	return -ESHUTDOWN;
589	}
590	return ret < 0 ? ret : read;
591	}
592
593	static size_t
594	xs_read_stream_headersize(bool isfrag)
595	{
596	if (isfrag)
597	return sizeof(__be32);
598	return 3 * sizeof(__be32);
599	}
600
601	static ssize_t
602	xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
603	int flags, size_t want, size_t seek)
604	{
605	struct kvec kvec = {
606	.iov_base = &transport->recv.fraghdr,
607	.iov_len = want,
608	};
609	return xs_read_kvec(sock: transport->sock, msg, flags, kvec: &kvec, count: want, seek);
610	}
611
612	#if defined(CONFIG_SUNRPC_BACKCHANNEL)
613	static ssize_t
614	xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
615	{
616	struct rpc_xprt *xprt = &transport->xprt;
617	struct rpc_rqst *req;
618	ssize_t ret;
619
620	/* Is this transport associated with the backchannel? */
621	if (!xprt->bc_serv)
622	return -ESHUTDOWN;
623
624	/* Look up and lock the request corresponding to the given XID */
625	req = xprt_lookup_bc_request(xprt, xid: transport->recv.xid);
626	if (!req) {
627	printk(KERN_WARNING "Callback slot table overflowed\n");
628	return -ESHUTDOWN;
629	}
630	if (transport->recv.copied && !req->rq_private_buf.len)
631	return -ESHUTDOWN;
632
633	ret = xs_read_stream_request(transport, msg, flags, req);
634	if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
635	xprt_complete_bc_request(req, copied: transport->recv.copied);
636	else
637	req->rq_private_buf.len = transport->recv.copied;
638
639	return ret;
640	}
641	#else /* CONFIG_SUNRPC_BACKCHANNEL */
642	static ssize_t
643	xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
644	{
645	return -ESHUTDOWN;
646	}
647	#endif /* CONFIG_SUNRPC_BACKCHANNEL */
648
649	static ssize_t
650	xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
651	{
652	struct rpc_xprt *xprt = &transport->xprt;
653	struct rpc_rqst *req;
654	ssize_t ret = 0;
655
656	/* Look up and lock the request corresponding to the given XID */
657	spin_lock(lock: &xprt->queue_lock);
658	req = xprt_lookup_rqst(xprt, xid: transport->recv.xid);
659	if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
660	msg->msg_flags |= MSG_TRUNC;
661	goto out;
662	}
663	xprt_pin_rqst(req);
664	spin_unlock(lock: &xprt->queue_lock);
665
666	ret = xs_read_stream_request(transport, msg, flags, req);
667
668	spin_lock(lock: &xprt->queue_lock);
669	if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
670	xprt_complete_rqst(task: req->rq_task, copied: transport->recv.copied);
671	else
672	req->rq_private_buf.len = transport->recv.copied;
673	xprt_unpin_rqst(req);
674	out:
675	spin_unlock(lock: &xprt->queue_lock);
676	return ret;
677	}
678
679	static ssize_t
680	xs_read_stream(struct sock_xprt *transport, int flags)
681	{
682	struct msghdr msg = { 0 };
683	size_t want, read = 0;
684	ssize_t ret = 0;
685
686	if (transport->recv.len == 0) {
687	want = xs_read_stream_headersize(isfrag: transport->recv.copied != 0);
688	ret = xs_read_stream_header(transport, msg: &msg, flags, want,
689	seek: transport->recv.offset);
690	if (ret <= 0)
691	goto out_err;
692	transport->recv.offset = ret;
693	if (transport->recv.offset != want)
694	return transport->recv.offset;
695	transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
696	RPC_FRAGMENT_SIZE_MASK;
697	transport->recv.offset -= sizeof(transport->recv.fraghdr);
698	read = ret;
699	}
700
701	switch (be32_to_cpu(transport->recv.calldir)) {
702	default:
703	msg.msg_flags |= MSG_TRUNC;
704	break;
705	case RPC_CALL:
706	ret = xs_read_stream_call(transport, msg: &msg, flags);
707	break;
708	case RPC_REPLY:
709	ret = xs_read_stream_reply(transport, msg: &msg, flags);
710	}
711	if (msg.msg_flags & MSG_TRUNC) {
712	transport->recv.calldir = cpu_to_be32(-1);
713	transport->recv.copied = -1;
714	}
715	if (ret < 0)
716	goto out_err;
717	read += ret;
718	if (transport->recv.offset < transport->recv.len) {
719	if (!(msg.msg_flags & MSG_TRUNC))
720	return read;
721	msg.msg_flags = 0;
722	ret = xs_read_discard(sock: transport->sock, msg: &msg, flags,
723	count: transport->recv.len - transport->recv.offset);
724	if (ret <= 0)
725	goto out_err;
726	transport->recv.offset += ret;
727	read += ret;
728	if (transport->recv.offset != transport->recv.len)
729	return read;
730	}
731	if (xs_read_stream_request_done(transport)) {
732	trace_xs_stream_read_request(xs: transport);
733	transport->recv.copied = 0;
734	}
735	transport->recv.offset = 0;
736	transport->recv.len = 0;
737	return read;
738	out_err:
739	return ret != 0 ? ret : -ESHUTDOWN;
740	}
741
742	static __poll_t xs_poll_socket(struct sock_xprt *transport)
743	{
744	return transport->sock->ops->poll(transport->file, transport->sock,
745	NULL);
746	}
747
748	static bool xs_poll_socket_readable(struct sock_xprt *transport)
749	{
750	__poll_t events = xs_poll_socket(transport);
751
752	return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
753	}
754
755	static void xs_poll_check_readable(struct sock_xprt *transport)
756	{
757
758	clear_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state);
759	if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
760	return;
761	if (!xs_poll_socket_readable(transport))
762	return;
763	if (!test_and_set_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state))
764	queue_work(wq: xprtiod_workqueue, work: &transport->recv_worker);
765	}
766
767	static void xs_stream_data_receive(struct sock_xprt *transport)
768	{
769	size_t read = 0;
770	ssize_t ret = 0;
771
772	mutex_lock(&transport->recv_mutex);
773	if (transport->sock == NULL)
774	goto out;
775	for (;;) {
776	ret = xs_read_stream(transport, MSG_DONTWAIT);
777	if (ret < 0)
778	break;
779	read += ret;
780	cond_resched();
781	}
782	if (ret == -ESHUTDOWN)
783	kernel_sock_shutdown(sock: transport->sock, how: SHUT_RDWR);
784	else if (ret == -EACCES)
785	xprt_wake_pending_tasks(xprt: &transport->xprt, status: -EACCES);
786	else
787	xs_poll_check_readable(transport);
788	out:
789	mutex_unlock(lock: &transport->recv_mutex);
790	trace_xs_stream_read_data(xprt: &transport->xprt, err: ret, total: read);
791	}
792
793	static void xs_stream_data_receive_workfn(struct work_struct *work)
794	{
795	struct sock_xprt *transport =
796	container_of(work, struct sock_xprt, recv_worker);
797	unsigned int pflags = memalloc_nofs_save();
798
799	xs_stream_data_receive(transport);
800	memalloc_nofs_restore(flags: pflags);
801	}
802
803	static void
804	xs_stream_reset_connect(struct sock_xprt *transport)
805	{
806	transport->recv.offset = 0;
807	transport->recv.len = 0;
808	transport->recv.copied = 0;
809	transport->xmit.offset = 0;
810	}
811
812	static void
813	xs_stream_start_connect(struct sock_xprt *transport)
814	{
815	transport->xprt.stat.connect_count++;
816	transport->xprt.stat.connect_start = jiffies;
817	}
818
819	#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
820
821	/**
822	* xs_nospace - handle transmit was incomplete
823	* @req: pointer to RPC request
824	* @transport: pointer to struct sock_xprt
825	*
826	*/
827	static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
828	{
829	struct rpc_xprt *xprt = &transport->xprt;
830	struct sock *sk = transport->inet;
831	int ret = -EAGAIN;
832
833	trace_rpc_socket_nospace(rqst: req, transport);
834
835	/* Protect against races with write_space */
836	spin_lock(lock: &xprt->transport_lock);
837
838	/* Don't race with disconnect */
839	if (xprt_connected(xprt)) {
840	/* wait for more buffer space */
841	set_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state);
842	set_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
843	sk->sk_write_pending++;
844	xprt_wait_for_buffer_space(xprt);
845	} else
846	ret = -ENOTCONN;
847
848	spin_unlock(lock: &xprt->transport_lock);
849	return ret;
850	}
851
852	static int xs_sock_nospace(struct rpc_rqst *req)
853	{
854	struct sock_xprt *transport =
855	container_of(req->rq_xprt, struct sock_xprt, xprt);
856	struct sock *sk = transport->inet;
857	int ret = -EAGAIN;
858
859	lock_sock(sk);
860	if (!sock_writeable(sk))
861	ret = xs_nospace(req, transport);
862	release_sock(sk);
863	return ret;
864	}
865
866	static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
867	{
868	struct sock_xprt *transport =
869	container_of(req->rq_xprt, struct sock_xprt, xprt);
870	struct sock *sk = transport->inet;
871	int ret = -EAGAIN;
872
873	if (vm_wait)
874	return -ENOBUFS;
875	lock_sock(sk);
876	if (!sk_stream_memory_free(sk))
877	ret = xs_nospace(req, transport);
878	release_sock(sk);
879	return ret;
880	}
881
882	static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
883	{
884	return xdr_alloc_bvec(buf, gfp: rpc_task_gfp_mask());
885	}
886
887	static void xs_stream_abort_send_request(struct rpc_rqst *req)
888	{
889	struct rpc_xprt *xprt = req->rq_xprt;
890	struct sock_xprt *transport =
891	container_of(xprt, struct sock_xprt, xprt);
892
893	if (transport->xmit.offset != 0 &&
894	!test_bit(XPRT_CLOSE_WAIT, &xprt->state))
895	xprt_force_disconnect(xprt);
896	}
897
898	/*
899	* Determine if the previous message in the stream was aborted before it
900	* could complete transmission.
901	*/
902	static bool
903	xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
904	{
905	return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
906	}
907
908	/*
909	* Return the stream record marker field for a record of length < 2^31-1
910	*/
911	static rpc_fraghdr
912	xs_stream_record_marker(struct xdr_buf *xdr)
913	{
914	if (!xdr->len)
915	return 0;
916	return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
917	}
918
919	/**
920	* xs_local_send_request - write an RPC request to an AF_LOCAL socket
921	* @req: pointer to RPC request
922	*
923	* Return values:
924	* 0: The request has been sent
925	* EAGAIN: The socket was blocked, please call again later to
926	* complete the request
927	* ENOTCONN: Caller needs to invoke connect logic then call again
928	* other: Some other error occurred, the request was not sent
929	*/
930	static int xs_local_send_request(struct rpc_rqst *req)
931	{
932	struct rpc_xprt *xprt = req->rq_xprt;
933	struct sock_xprt *transport =
934	container_of(xprt, struct sock_xprt, xprt);
935	struct xdr_buf *xdr = &req->rq_snd_buf;
936	rpc_fraghdr rm = xs_stream_record_marker(xdr);
937	unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
938	struct msghdr msg = {
939	.msg_flags = XS_SENDMSG_FLAGS,
940	};
941	bool vm_wait;
942	unsigned int sent;
943	int status;
944
945	/* Close the stream if the previous transmission was incomplete */
946	if (xs_send_request_was_aborted(transport, req)) {
947	xprt_force_disconnect(xprt);
948	return -ENOTCONN;
949	}
950
951	xs_pktdump(msg: "packet data:",
952	packet: req->rq_svec->iov_base, count: req->rq_svec->iov_len);
953
954	vm_wait = sk_stream_is_writeable(sk: transport->inet) ? true : false;
955
956	req->rq_xtime = ktime_get();
957	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr,
958	base: transport->xmit.offset, marker: rm, sent_p: &sent);
959	dprintk("RPC: %s(%u) = %d\n",
960	__func__, xdr->len - transport->xmit.offset, status);
961
962	if (likely(sent > 0) || status == 0) {
963	transport->xmit.offset += sent;
964	req->rq_bytes_sent = transport->xmit.offset;
965	if (likely(req->rq_bytes_sent >= msglen)) {
966	req->rq_xmit_bytes_sent += transport->xmit.offset;
967	transport->xmit.offset = 0;
968	return 0;
969	}
970	status = -EAGAIN;
971	vm_wait = false;
972	}
973
974	switch (status) {
975	case -EAGAIN:
976	status = xs_stream_nospace(req, vm_wait);
977	break;
978	default:
979	dprintk("RPC: sendmsg returned unrecognized error %d\n",
980	-status);
981	fallthrough;
982	case -EPIPE:
983	xprt_force_disconnect(xprt);
984	status = -ENOTCONN;
985	}
986
987	return status;
988	}
989
990	/**
991	* xs_udp_send_request - write an RPC request to a UDP socket
992	* @req: pointer to RPC request
993	*
994	* Return values:
995	* 0: The request has been sent
996	* EAGAIN: The socket was blocked, please call again later to
997	* complete the request
998	* ENOTCONN: Caller needs to invoke connect logic then call again
999	* other: Some other error occurred, the request was not sent
1000	*/
1001	static int xs_udp_send_request(struct rpc_rqst *req)
1002	{
1003	struct rpc_xprt *xprt = req->rq_xprt;
1004	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1005	struct xdr_buf *xdr = &req->rq_snd_buf;
1006	struct msghdr msg = {
1007	.msg_name = xs_addr(xprt),
1008	.msg_namelen = xprt->addrlen,
1009	.msg_flags = XS_SENDMSG_FLAGS,
1010	};
1011	unsigned int sent;
1012	int status;
1013
1014	xs_pktdump(msg: "packet data:",
1015	packet: req->rq_svec->iov_base,
1016	count: req->rq_svec->iov_len);
1017
1018	if (!xprt_bound(xprt))
1019	return -ENOTCONN;
1020
1021	if (!xprt_request_get_cong(xprt, req))
1022	return -EBADSLT;
1023
1024	status = xdr_alloc_bvec(buf: xdr, gfp: rpc_task_gfp_mask());
1025	if (status < 0)
1026	return status;
1027	req->rq_xtime = ktime_get();
1028	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr, base: 0, marker: 0, sent_p: &sent);
1029
1030	dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1031	xdr->len, status);
1032
1033	/* firewall is blocking us, don't return -EAGAIN or we end up looping */
1034	if (status == -EPERM)
1035	goto process_status;
1036
1037	if (status == -EAGAIN && sock_writeable(sk: transport->inet))
1038	status = -ENOBUFS;
1039
1040	if (sent > 0 || status == 0) {
1041	req->rq_xmit_bytes_sent += sent;
1042	if (sent >= req->rq_slen)
1043	return 0;
1044	/* Still some bytes left; set up for a retry later. */
1045	status = -EAGAIN;
1046	}
1047
1048	process_status:
1049	switch (status) {
1050	case -ENOTSOCK:
1051	status = -ENOTCONN;
1052	/* Should we call xs_close() here? */
1053	break;
1054	case -EAGAIN:
1055	status = xs_sock_nospace(req);
1056	break;
1057	case -ENETUNREACH:
1058	case -ENOBUFS:
1059	case -EPIPE:
1060	case -ECONNREFUSED:
1061	case -EPERM:
1062	/* When the server has died, an ICMP port unreachable message
1063	* prompts ECONNREFUSED. */
1064	break;
1065	default:
1066	dprintk("RPC: sendmsg returned unrecognized error %d\n",
1067	-status);
1068	}
1069
1070	return status;
1071	}
1072
1073	/**
1074	* xs_tcp_send_request - write an RPC request to a TCP socket
1075	* @req: pointer to RPC request
1076	*
1077	* Return values:
1078	* 0: The request has been sent
1079	* EAGAIN: The socket was blocked, please call again later to
1080	* complete the request
1081	* ENOTCONN: Caller needs to invoke connect logic then call again
1082	* other: Some other error occurred, the request was not sent
1083	*
1084	* XXX: In the case of soft timeouts, should we eventually give up
1085	* if sendmsg is not able to make progress?
1086	*/
1087	static int xs_tcp_send_request(struct rpc_rqst *req)
1088	{
1089	struct rpc_xprt *xprt = req->rq_xprt;
1090	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1091	struct xdr_buf *xdr = &req->rq_snd_buf;
1092	rpc_fraghdr rm = xs_stream_record_marker(xdr);
1093	unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1094	struct msghdr msg = {
1095	.msg_flags = XS_SENDMSG_FLAGS,
1096	};
1097	bool vm_wait;
1098	unsigned int sent;
1099	int status;
1100
1101	/* Close the stream if the previous transmission was incomplete */
1102	if (xs_send_request_was_aborted(transport, req)) {
1103	if (transport->sock != NULL)
1104	kernel_sock_shutdown(sock: transport->sock, how: SHUT_RDWR);
1105	return -ENOTCONN;
1106	}
1107	if (!transport->inet)
1108	return -ENOTCONN;
1109
1110	xs_pktdump(msg: "packet data:",
1111	packet: req->rq_svec->iov_base,
1112	count: req->rq_svec->iov_len);
1113
1114	if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1115	xs_tcp_set_socket_timeouts(xprt, sock: transport->sock);
1116
1117	xs_set_srcport(transport, sock: transport->sock);
1118
1119	/* Continue transmitting the packet/record. We must be careful
1120	* to cope with writespace callbacks arriving _after_ we have
1121	* called sendmsg(). */
1122	req->rq_xtime = ktime_get();
1123	tcp_sock_set_cork(sk: transport->inet, on: true);
1124
1125	vm_wait = sk_stream_is_writeable(sk: transport->inet) ? true : false;
1126
1127	do {
1128	status = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr,
1129	base: transport->xmit.offset, marker: rm, sent_p: &sent);
1130
1131	dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1132	xdr->len - transport->xmit.offset, status);
1133
1134	/* If we've sent the entire packet, immediately
1135	* reset the count of bytes sent. */
1136	transport->xmit.offset += sent;
1137	req->rq_bytes_sent = transport->xmit.offset;
1138	if (likely(req->rq_bytes_sent >= msglen)) {
1139	req->rq_xmit_bytes_sent += transport->xmit.offset;
1140	transport->xmit.offset = 0;
1141	if (atomic_long_read(v: &xprt->xmit_queuelen) == 1)
1142	tcp_sock_set_cork(sk: transport->inet, on: false);
1143	return 0;
1144	}
1145
1146	WARN_ON_ONCE(sent == 0 && status == 0);
1147
1148	if (sent > 0)
1149	vm_wait = false;
1150
1151	} while (status == 0);
1152
1153	switch (status) {
1154	case -ENOTSOCK:
1155	status = -ENOTCONN;
1156	/* Should we call xs_close() here? */
1157	break;
1158	case -EAGAIN:
1159	status = xs_stream_nospace(req, vm_wait);
1160	break;
1161	case -ECONNRESET:
1162	case -ECONNREFUSED:
1163	case -ENOTCONN:
1164	case -EADDRINUSE:
1165	case -ENOBUFS:
1166	case -EPIPE:
1167	break;
1168	default:
1169	dprintk("RPC: sendmsg returned unrecognized error %d\n",
1170	-status);
1171	}
1172
1173	return status;
1174	}
1175
1176	static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1177	{
1178	transport->old_data_ready = sk->sk_data_ready;
1179	transport->old_state_change = sk->sk_state_change;
1180	transport->old_write_space = sk->sk_write_space;
1181	transport->old_error_report = sk->sk_error_report;
1182	}
1183
1184	static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1185	{
1186	sk->sk_data_ready = transport->old_data_ready;
1187	sk->sk_state_change = transport->old_state_change;
1188	sk->sk_write_space = transport->old_write_space;
1189	sk->sk_error_report = transport->old_error_report;
1190	}
1191
1192	static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1193	{
1194	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1195
1196	transport->xprt_err = 0;
1197	clear_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state);
1198	clear_bit(XPRT_SOCK_WAKE_ERROR, addr: &transport->sock_state);
1199	clear_bit(XPRT_SOCK_WAKE_WRITE, addr: &transport->sock_state);
1200	clear_bit(XPRT_SOCK_WAKE_DISCONNECT, addr: &transport->sock_state);
1201	clear_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state);
1202	}
1203
1204	static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1205	{
1206	set_bit(nr, addr: &transport->sock_state);
1207	queue_work(wq: xprtiod_workqueue, work: &transport->error_worker);
1208	}
1209
1210	static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1211	{
1212	xprt->connect_cookie++;
1213	smp_mb__before_atomic();
1214	clear_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1215	clear_bit(XPRT_CLOSING, addr: &xprt->state);
1216	xs_sock_reset_state_flags(xprt);
1217	smp_mb__after_atomic();
1218	}
1219
1220	/**
1221	* xs_error_report - callback to handle TCP socket state errors
1222	* @sk: socket
1223	*
1224	* Note: we don't call sock_error() since there may be a rpc_task
1225	* using the socket, and so we don't want to clear sk->sk_err.
1226	*/
1227	static void xs_error_report(struct sock *sk)
1228	{
1229	struct sock_xprt *transport;
1230	struct rpc_xprt *xprt;
1231
1232	if (!(xprt = xprt_from_sock(sk)))
1233	return;
1234
1235	transport = container_of(xprt, struct sock_xprt, xprt);
1236	transport->xprt_err = -sk->sk_err;
1237	if (transport->xprt_err == 0)
1238	return;
1239	dprintk("RPC: xs_error_report client %p, error=%d...\n",
1240	xprt, -transport->xprt_err);
1241	trace_rpc_socket_error(xprt, socket: sk->sk_socket, error: transport->xprt_err);
1242
1243	/* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1244	smp_mb__before_atomic();
1245	xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1246	}
1247
1248	static void xs_reset_transport(struct sock_xprt *transport)
1249	{
1250	struct socket *sock = transport->sock;
1251	struct sock *sk = transport->inet;
1252	struct rpc_xprt *xprt = &transport->xprt;
1253	struct file *filp = transport->file;
1254
1255	if (sk == NULL)
1256	return;
1257	/*
1258	* Make sure we're calling this in a context from which it is safe
1259	* to call __fput_sync(). In practice that means rpciod and the
1260	* system workqueue.
1261	*/
1262	if (!(current->flags & PF_WQ_WORKER)) {
1263	WARN_ON_ONCE(1);
1264	set_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1265	return;
1266	}
1267
1268	if (atomic_read(v: &transport->xprt.swapper))
1269	sk_clear_memalloc(sk);
1270
1271	tls_handshake_cancel(sk);
1272
1273	kernel_sock_shutdown(sock, how: SHUT_RDWR);
1274
1275	mutex_lock(&transport->recv_mutex);
1276	lock_sock(sk);
1277	transport->inet = NULL;
1278	transport->sock = NULL;
1279	transport->file = NULL;
1280
1281	sk->sk_user_data = NULL;
1282
1283	xs_restore_old_callbacks(transport, sk);
1284	xprt_clear_connected(xprt);
1285	xs_sock_reset_connection_flags(xprt);
1286	/* Reset stream record info */
1287	xs_stream_reset_connect(transport);
1288	release_sock(sk);
1289	mutex_unlock(lock: &transport->recv_mutex);
1290
1291	trace_rpc_socket_close(xprt, socket: sock);
1292	__fput_sync(filp);
1293
1294	xprt_disconnect_done(xprt);
1295	}
1296
1297	/**
1298	* xs_close - close a socket
1299	* @xprt: transport
1300	*
1301	* This is used when all requests are complete; ie, no DRC state remains
1302	* on the server we want to save.
1303	*
1304	* The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1305	* xs_reset_transport() zeroing the socket from underneath a writer.
1306	*/
1307	static void xs_close(struct rpc_xprt *xprt)
1308	{
1309	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1310
1311	dprintk("RPC: xs_close xprt %p\n", xprt);
1312
1313	if (transport->sock)
1314	tls_handshake_close(sock: transport->sock);
1315	xs_reset_transport(transport);
1316	xprt->reestablish_timeout = 0;
1317	}
1318
1319	static void xs_inject_disconnect(struct rpc_xprt *xprt)
1320	{
1321	dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1322	xprt);
1323	xprt_disconnect_done(xprt);
1324	}
1325
1326	static void xs_xprt_free(struct rpc_xprt *xprt)
1327	{
1328	xs_free_peer_addresses(xprt);
1329	xprt_free(xprt);
1330	}
1331
1332	/**
1333	* xs_destroy - prepare to shutdown a transport
1334	* @xprt: doomed transport
1335	*
1336	*/
1337	static void xs_destroy(struct rpc_xprt *xprt)
1338	{
1339	struct sock_xprt *transport = container_of(xprt,
1340	struct sock_xprt, xprt);
1341	dprintk("RPC: xs_destroy xprt %p\n", xprt);
1342
1343	cancel_delayed_work_sync(dwork: &transport->connect_worker);
1344	xs_close(xprt);
1345	cancel_work_sync(work: &transport->recv_worker);
1346	cancel_work_sync(work: &transport->error_worker);
1347	xs_xprt_free(xprt);
1348	module_put(THIS_MODULE);
1349	}
1350
1351	/**
1352	* xs_udp_data_read_skb - receive callback for UDP sockets
1353	* @xprt: transport
1354	* @sk: socket
1355	* @skb: skbuff
1356	*
1357	*/
1358	static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1359	struct sock *sk,
1360	struct sk_buff *skb)
1361	{
1362	struct rpc_task *task;
1363	struct rpc_rqst *rovr;
1364	int repsize, copied;
1365	u32 _xid;
1366	__be32 *xp;
1367
1368	repsize = skb->len;
1369	if (repsize < 4) {
1370	dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1371	return;
1372	}
1373
1374	/* Copy the XID from the skb... */
1375	xp = skb_header_pointer(skb, offset: 0, len: sizeof(_xid), buffer: &_xid);
1376	if (xp == NULL)
1377	return;
1378
1379	/* Look up and lock the request corresponding to the given XID */
1380	spin_lock(lock: &xprt->queue_lock);
1381	rovr = xprt_lookup_rqst(xprt, xid: *xp);
1382	if (!rovr)
1383	goto out_unlock;
1384	xprt_pin_rqst(req: rovr);
1385	xprt_update_rtt(task: rovr->rq_task);
1386	spin_unlock(lock: &xprt->queue_lock);
1387	task = rovr->rq_task;
1388
1389	if ((copied = rovr->rq_private_buf.buflen) > repsize)
1390	copied = repsize;
1391
1392	/* Suck it into the iovec, verify checksum if not done by hw. */
1393	if (csum_partial_copy_to_xdr(xdr: &rovr->rq_private_buf, skb)) {
1394	spin_lock(lock: &xprt->queue_lock);
1395	__UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1396	goto out_unpin;
1397	}
1398
1399
1400	spin_lock(lock: &xprt->transport_lock);
1401	xprt_adjust_cwnd(xprt, task, result: copied);
1402	spin_unlock(lock: &xprt->transport_lock);
1403	spin_lock(lock: &xprt->queue_lock);
1404	xprt_complete_rqst(task, copied);
1405	__UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1406	out_unpin:
1407	xprt_unpin_rqst(req: rovr);
1408	out_unlock:
1409	spin_unlock(lock: &xprt->queue_lock);
1410	}
1411
1412	static void xs_udp_data_receive(struct sock_xprt *transport)
1413	{
1414	struct sk_buff *skb;
1415	struct sock *sk;
1416	int err;
1417
1418	mutex_lock(&transport->recv_mutex);
1419	sk = transport->inet;
1420	if (sk == NULL)
1421	goto out;
1422	for (;;) {
1423	skb = skb_recv_udp(sk, MSG_DONTWAIT, err: &err);
1424	if (skb == NULL)
1425	break;
1426	xs_udp_data_read_skb(xprt: &transport->xprt, sk, skb);
1427	consume_skb(skb);
1428	cond_resched();
1429	}
1430	xs_poll_check_readable(transport);
1431	out:
1432	mutex_unlock(lock: &transport->recv_mutex);
1433	}
1434
1435	static void xs_udp_data_receive_workfn(struct work_struct *work)
1436	{
1437	struct sock_xprt *transport =
1438	container_of(work, struct sock_xprt, recv_worker);
1439	unsigned int pflags = memalloc_nofs_save();
1440
1441	xs_udp_data_receive(transport);
1442	memalloc_nofs_restore(flags: pflags);
1443	}
1444
1445	/**
1446	* xs_data_ready - "data ready" callback for sockets
1447	* @sk: socket with data to read
1448	*
1449	*/
1450	static void xs_data_ready(struct sock *sk)
1451	{
1452	struct rpc_xprt *xprt;
1453
1454	trace_sk_data_ready(sk);
1455
1456	xprt = xprt_from_sock(sk);
1457	if (xprt != NULL) {
1458	struct sock_xprt *transport = container_of(xprt,
1459	struct sock_xprt, xprt);
1460
1461	trace_xs_data_ready(xprt);
1462
1463	transport->old_data_ready(sk);
1464
1465	if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1466	return;
1467
1468	/* Any data means we had a useful conversation, so
1469	* then we don't need to delay the next reconnect
1470	*/
1471	if (xprt->reestablish_timeout)
1472	xprt->reestablish_timeout = 0;
1473	if (!test_and_set_bit(XPRT_SOCK_DATA_READY, addr: &transport->sock_state))
1474	queue_work(wq: xprtiod_workqueue, work: &transport->recv_worker);
1475	}
1476	}
1477
1478	/*
1479	* Helper function to force a TCP close if the server is sending
1480	* junk and/or it has put us in CLOSE_WAIT
1481	*/
1482	static void xs_tcp_force_close(struct rpc_xprt *xprt)
1483	{
1484	xprt_force_disconnect(xprt);
1485	}
1486
1487	#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1488	static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1489	{
1490	return PAGE_SIZE;
1491	}
1492	#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1493
1494	/**
1495	* xs_local_state_change - callback to handle AF_LOCAL socket state changes
1496	* @sk: socket whose state has changed
1497	*
1498	*/
1499	static void xs_local_state_change(struct sock *sk)
1500	{
1501	struct rpc_xprt *xprt;
1502	struct sock_xprt *transport;
1503
1504	if (!(xprt = xprt_from_sock(sk)))
1505	return;
1506	transport = container_of(xprt, struct sock_xprt, xprt);
1507	if (sk->sk_shutdown & SHUTDOWN_MASK) {
1508	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1509	/* Trigger the socket release */
1510	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1511	}
1512	}
1513
1514	/**
1515	* xs_tcp_state_change - callback to handle TCP socket state changes
1516	* @sk: socket whose state has changed
1517	*
1518	*/
1519	static void xs_tcp_state_change(struct sock *sk)
1520	{
1521	struct rpc_xprt *xprt;
1522	struct sock_xprt *transport;
1523
1524	if (!(xprt = xprt_from_sock(sk)))
1525	return;
1526	dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1527	dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1528	sk->sk_state, xprt_connected(xprt),
1529	sock_flag(sk, SOCK_DEAD),
1530	sock_flag(sk, SOCK_ZAPPED),
1531	sk->sk_shutdown);
1532
1533	transport = container_of(xprt, struct sock_xprt, xprt);
1534	trace_rpc_socket_state_change(xprt, socket: sk->sk_socket);
1535	switch (sk->sk_state) {
1536	case TCP_ESTABLISHED:
1537	if (!xprt_test_and_set_connected(xprt)) {
1538	xprt->connect_cookie++;
1539	clear_bit(XPRT_SOCK_CONNECTING, addr: &transport->sock_state);
1540	xprt_clear_connecting(xprt);
1541
1542	xprt->stat.connect_count++;
1543	xprt->stat.connect_time += (long)jiffies -
1544	xprt->stat.connect_start;
1545	xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1546	}
1547	break;
1548	case TCP_FIN_WAIT1:
1549	/* The client initiated a shutdown of the socket */
1550	xprt->connect_cookie++;
1551	xprt->reestablish_timeout = 0;
1552	set_bit(XPRT_CLOSING, addr: &xprt->state);
1553	smp_mb__before_atomic();
1554	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1555	clear_bit(XPRT_CLOSE_WAIT, addr: &xprt->state);
1556	smp_mb__after_atomic();
1557	break;
1558	case TCP_CLOSE_WAIT:
1559	/* The server initiated a shutdown of the socket */
1560	xprt->connect_cookie++;
1561	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1562	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1563	fallthrough;
1564	case TCP_CLOSING:
1565	/*
1566	* If the server closed down the connection, make sure that
1567	* we back off before reconnecting
1568	*/
1569	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1570	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1571	break;
1572	case TCP_LAST_ACK:
1573	set_bit(XPRT_CLOSING, addr: &xprt->state);
1574	smp_mb__before_atomic();
1575	clear_bit(XPRT_CONNECTED, addr: &xprt->state);
1576	smp_mb__after_atomic();
1577	break;
1578	case TCP_CLOSE:
1579	if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1580	addr: &transport->sock_state)) {
1581	xs_reset_srcport(transport);
1582	xprt_clear_connecting(xprt);
1583	}
1584	clear_bit(XPRT_CLOSING, addr: &xprt->state);
1585	/* Trigger the socket release */
1586	xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1587	}
1588	}
1589
1590	static void xs_write_space(struct sock *sk)
1591	{
1592	struct sock_xprt *transport;
1593	struct rpc_xprt *xprt;
1594
1595	if (!sk->sk_socket)
1596	return;
1597	clear_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
1598
1599	if (unlikely(!(xprt = xprt_from_sock(sk))))
1600	return;
1601	transport = container_of(xprt, struct sock_xprt, xprt);
1602	if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, addr: &transport->sock_state))
1603	return;
1604	xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1605	sk->sk_write_pending--;
1606	}
1607
1608	/**
1609	* xs_udp_write_space - callback invoked when socket buffer space
1610	* becomes available
1611	* @sk: socket whose state has changed
1612	*
1613	* Called when more output buffer space is available for this socket.
1614	* We try not to wake our writers until they can make "significant"
1615	* progress, otherwise we'll waste resources thrashing kernel_sendmsg
1616	* with a bunch of small requests.
1617	*/
1618	static void xs_udp_write_space(struct sock *sk)
1619	{
1620	/* from net/core/sock.c:sock_def_write_space */
1621	if (sock_writeable(sk))
1622	xs_write_space(sk);
1623	}
1624
1625	/**
1626	* xs_tcp_write_space - callback invoked when socket buffer space
1627	* becomes available
1628	* @sk: socket whose state has changed
1629	*
1630	* Called when more output buffer space is available for this socket.
1631	* We try not to wake our writers until they can make "significant"
1632	* progress, otherwise we'll waste resources thrashing kernel_sendmsg
1633	* with a bunch of small requests.
1634	*/
1635	static void xs_tcp_write_space(struct sock *sk)
1636	{
1637	/* from net/core/stream.c:sk_stream_write_space */
1638	if (sk_stream_is_writeable(sk))
1639	xs_write_space(sk);
1640	}
1641
1642	static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1643	{
1644	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1645	struct sock *sk = transport->inet;
1646
1647	if (transport->rcvsize) {
1648	sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1649	sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1650	}
1651	if (transport->sndsize) {
1652	sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1653	sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1654	sk->sk_write_space(sk);
1655	}
1656	}
1657
1658	/**
1659	* xs_udp_set_buffer_size - set send and receive limits
1660	* @xprt: generic transport
1661	* @sndsize: requested size of send buffer, in bytes
1662	* @rcvsize: requested size of receive buffer, in bytes
1663	*
1664	* Set socket send and receive buffer size limits.
1665	*/
1666	static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1667	{
1668	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1669
1670	transport->sndsize = 0;
1671	if (sndsize)
1672	transport->sndsize = sndsize + 1024;
1673	transport->rcvsize = 0;
1674	if (rcvsize)
1675	transport->rcvsize = rcvsize + 1024;
1676
1677	xs_udp_do_set_buffer_size(xprt);
1678	}
1679
1680	/**
1681	* xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1682	* @xprt: controlling transport
1683	* @task: task that timed out
1684	*
1685	* Adjust the congestion window after a retransmit timeout has occurred.
1686	*/
1687	static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1688	{
1689	spin_lock(lock: &xprt->transport_lock);
1690	xprt_adjust_cwnd(xprt, task, result: -ETIMEDOUT);
1691	spin_unlock(lock: &xprt->transport_lock);
1692	}
1693
1694	static int xs_get_random_port(void)
1695	{
1696	unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1697	unsigned short range;
1698	unsigned short rand;
1699
1700	if (max < min)
1701	return -EADDRINUSE;
1702	range = max - min + 1;
1703	rand = get_random_u32_below(ceil: range);
1704	return rand + min;
1705	}
1706
1707	static unsigned short xs_sock_getport(struct socket *sock)
1708	{
1709	struct sockaddr_storage buf;
1710	unsigned short port = 0;
1711
1712	if (kernel_getsockname(sock, addr: (struct sockaddr *)&buf) < 0)
1713	goto out;
1714	switch (buf.ss_family) {
1715	case AF_INET6:
1716	port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1717	break;
1718	case AF_INET:
1719	port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1720	}
1721	out:
1722	return port;
1723	}
1724
1725	/**
1726	* xs_set_port - reset the port number in the remote endpoint address
1727	* @xprt: generic transport
1728	* @port: new port number
1729	*
1730	*/
1731	static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1732	{
1733	dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1734
1735	rpc_set_port(sap: xs_addr(xprt), port);
1736	xs_update_peer_port(xprt);
1737	}
1738
1739	static void xs_reset_srcport(struct sock_xprt *transport)
1740	{
1741	transport->srcport = 0;
1742	}
1743
1744	static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1745	{
1746	if (transport->srcport == 0 && transport->xprt.reuseport)
1747	transport->srcport = xs_sock_getport(sock);
1748	}
1749
1750	static int xs_get_srcport(struct sock_xprt *transport)
1751	{
1752	int port = transport->srcport;
1753
1754	if (port == 0 && transport->xprt.resvport)
1755	port = xs_get_random_port();
1756	return port;
1757	}
1758
1759	static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1760	{
1761	struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1762	unsigned short ret = 0;
1763	mutex_lock(&sock->recv_mutex);
1764	if (sock->sock)
1765	ret = xs_sock_getport(sock: sock->sock);
1766	mutex_unlock(lock: &sock->recv_mutex);
1767	return ret;
1768	}
1769
1770	static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1771	{
1772	struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1773	union {
1774	struct sockaddr sa;
1775	struct sockaddr_storage st;
1776	} saddr;
1777	int ret = -ENOTCONN;
1778
1779	mutex_lock(&sock->recv_mutex);
1780	if (sock->sock) {
1781	ret = kernel_getsockname(sock: sock->sock, addr: &saddr.sa);
1782	if (ret >= 0)
1783	ret = snprintf(buf, size: buflen, fmt: "%pISc", &saddr.sa);
1784	}
1785	mutex_unlock(lock: &sock->recv_mutex);
1786	return ret;
1787	}
1788
1789	static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1790	{
1791	if (transport->srcport != 0)
1792	transport->srcport = 0;
1793	if (!transport->xprt.resvport)
1794	return 0;
1795	if (port <= xprt_min_resvport || port > xprt_max_resvport)
1796	return xprt_max_resvport;
1797	return --port;
1798	}
1799	static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1800	{
1801	struct sockaddr_storage myaddr;
1802	int err, nloop = 0;
1803	int port = xs_get_srcport(transport);
1804	unsigned short last;
1805
1806	/*
1807	* If we are asking for any ephemeral port (i.e. port == 0 &&
1808	* transport->xprt.resvport == 0), don't bind. Let the local
1809	* port selection happen implicitly when the socket is used
1810	* (for example at connect time).
1811	*
1812	* This ensures that we can continue to establish TCP
1813	* connections even when all local ephemeral ports are already
1814	* a part of some TCP connection. This makes no difference
1815	* for UDP sockets, but also doesn't harm them.
1816	*
1817	* If we're asking for any reserved port (i.e. port == 0 &&
1818	* transport->xprt.resvport == 1) xs_get_srcport above will
1819	* ensure that port is non-zero and we will bind as needed.
1820	*/
1821	if (port <= 0)
1822	return port;
1823
1824	memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1825	do {
1826	rpc_set_port(sap: (struct sockaddr *)&myaddr, port);
1827	err = kernel_bind(sock, addr: (struct sockaddr *)&myaddr,
1828	addrlen: transport->xprt.addrlen);
1829	if (err == 0) {
1830	if (transport->xprt.reuseport)
1831	transport->srcport = port;
1832	break;
1833	}
1834	last = port;
1835	port = xs_next_srcport(transport, port);
1836	if (port > last)
1837	nloop++;
1838	} while (err == -EADDRINUSE && nloop != 2);
1839
1840	if (myaddr.ss_family == AF_INET)
1841	dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1842	&((struct sockaddr_in *)&myaddr)->sin_addr,
1843	port, err ? "failed" : "ok", err);
1844	else
1845	dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1846	&((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1847	port, err ? "failed" : "ok", err);
1848	return err;
1849	}
1850
1851	/*
1852	* We don't support autobind on AF_LOCAL sockets
1853	*/
1854	static void xs_local_rpcbind(struct rpc_task *task)
1855	{
1856	xprt_set_bound(xprt: task->tk_xprt);
1857	}
1858
1859	static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1860	{
1861	}
1862
1863	#ifdef CONFIG_DEBUG_LOCK_ALLOC
1864	static struct lock_class_key xs_key[3];
1865	static struct lock_class_key xs_slock_key[3];
1866
1867	static inline void xs_reclassify_socketu(struct socket *sock)
1868	{
1869	struct sock *sk = sock->sk;
1870
1871	sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1872	&xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1873	}
1874
1875	static inline void xs_reclassify_socket4(struct socket *sock)
1876	{
1877	struct sock *sk = sock->sk;
1878
1879	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1880	&xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1881	}
1882
1883	static inline void xs_reclassify_socket6(struct socket *sock)
1884	{
1885	struct sock *sk = sock->sk;
1886
1887	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1888	&xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1889	}
1890
1891	static inline void xs_reclassify_socket(int family, struct socket *sock)
1892	{
1893	if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1894	return;
1895
1896	switch (family) {
1897	case AF_LOCAL:
1898	xs_reclassify_socketu(sock);
1899	break;
1900	case AF_INET:
1901	xs_reclassify_socket4(sock);
1902	break;
1903	case AF_INET6:
1904	xs_reclassify_socket6(sock);
1905	break;
1906	}
1907	}
1908	#else
1909	static inline void xs_reclassify_socket(int family, struct socket *sock)
1910	{
1911	}
1912	#endif
1913
1914	static void xs_dummy_setup_socket(struct work_struct *work)
1915	{
1916	}
1917
1918	static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1919	struct sock_xprt *transport, int family, int type,
1920	int protocol, bool reuseport)
1921	{
1922	struct file *filp;
1923	struct socket *sock;
1924	int err;
1925
1926	err = __sock_create(net: xprt->xprt_net, family, type, proto: protocol, res: &sock, kern: 1);
1927	if (err < 0) {
1928	dprintk("RPC: can't create %d transport socket (%d).\n",
1929	protocol, -err);
1930	goto out;
1931	}
1932	xs_reclassify_socket(family, sock);
1933
1934	if (reuseport)
1935	sock_set_reuseport(sk: sock->sk);
1936
1937	err = xs_bind(transport, sock);
1938	if (err) {
1939	sock_release(sock);
1940	goto out;
1941	}
1942
1943	filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1944	if (IS_ERR(ptr: filp))
1945	return ERR_CAST(ptr: filp);
1946	transport->file = filp;
1947
1948	return sock;
1949	out:
1950	return ERR_PTR(error: err);
1951	}
1952
1953	static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1954	struct socket *sock)
1955	{
1956	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1957	xprt);
1958
1959	if (!transport->inet) {
1960	struct sock *sk = sock->sk;
1961
1962	lock_sock(sk);
1963
1964	xs_save_old_callbacks(transport, sk);
1965
1966	sk->sk_user_data = xprt;
1967	sk->sk_data_ready = xs_data_ready;
1968	sk->sk_write_space = xs_udp_write_space;
1969	sk->sk_state_change = xs_local_state_change;
1970	sk->sk_error_report = xs_error_report;
1971	sk->sk_use_task_frag = false;
1972
1973	xprt_clear_connected(xprt);
1974
1975	/* Reset to new socket */
1976	transport->sock = sock;
1977	transport->inet = sk;
1978
1979	release_sock(sk);
1980	}
1981
1982	xs_stream_start_connect(transport);
1983
1984	return kernel_connect(sock, addr: xs_addr(xprt), addrlen: xprt->addrlen, flags: 0);
1985	}
1986
1987	/**
1988	* xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1989	* @transport: socket transport to connect
1990	*/
1991	static int xs_local_setup_socket(struct sock_xprt *transport)
1992	{
1993	struct rpc_xprt *xprt = &transport->xprt;
1994	struct file *filp;
1995	struct socket *sock;
1996	int status;
1997
1998	status = __sock_create(net: xprt->xprt_net, AF_LOCAL,
1999	type: SOCK_STREAM, proto: 0, res: &sock, kern: 1);
2000	if (status < 0) {
2001	dprintk("RPC: can't create AF_LOCAL "
2002	"transport socket (%d).\n", -status);
2003	goto out;
2004	}
2005	xs_reclassify_socket(AF_LOCAL, sock);
2006
2007	filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
2008	if (IS_ERR(ptr: filp)) {
2009	status = PTR_ERR(ptr: filp);
2010	goto out;
2011	}
2012	transport->file = filp;
2013
2014	dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2015	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2016
2017	status = xs_local_finish_connecting(xprt, sock);
2018	trace_rpc_socket_connect(xprt, socket: sock, error: status);
2019	switch (status) {
2020	case 0:
2021	dprintk("RPC: xprt %p connected to %s\n",
2022	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2023	xprt->stat.connect_count++;
2024	xprt->stat.connect_time += (long)jiffies -
2025	xprt->stat.connect_start;
2026	xprt_set_connected(xprt);
2027	break;
2028	case -ENOBUFS:
2029	break;
2030	case -ENOENT:
2031	dprintk("RPC: xprt %p: socket %s does not exist\n",
2032	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2033	break;
2034	case -ECONNREFUSED:
2035	dprintk("RPC: xprt %p: connection refused for %s\n",
2036	xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2037	break;
2038	default:
2039	printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2040	__func__, -status,
2041	xprt->address_strings[RPC_DISPLAY_ADDR]);
2042	}
2043
2044	out:
2045	xprt_clear_connecting(xprt);
2046	xprt_wake_pending_tasks(xprt, status);
2047	return status;
2048	}
2049
2050	static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2051	{
2052	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2053	int ret;
2054
2055	if (transport->file)
2056	goto force_disconnect;
2057
2058	if (RPC_IS_ASYNC(task)) {
2059	/*
2060	* We want the AF_LOCAL connect to be resolved in the
2061	* filesystem namespace of the process making the rpc
2062	* call. Thus we connect synchronously.
2063	*
2064	* If we want to support asynchronous AF_LOCAL calls,
2065	* we'll need to figure out how to pass a namespace to
2066	* connect.
2067	*/
2068	rpc_task_set_rpc_status(task, rpc_status: -ENOTCONN);
2069	goto out_wake;
2070	}
2071	ret = xs_local_setup_socket(transport);
2072	if (ret && !RPC_IS_SOFTCONN(task))
2073	msleep_interruptible(msecs: 15000);
2074	return;
2075	force_disconnect:
2076	xprt_force_disconnect(xprt);
2077	out_wake:
2078	xprt_clear_connecting(xprt);
2079	xprt_wake_pending_tasks(xprt, status: -ENOTCONN);
2080	}
2081
2082	#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2083	/*
2084	* Note that this should be called with XPRT_LOCKED held, or recv_mutex
2085	* held, or when we otherwise know that we have exclusive access to the
2086	* socket, to guard against races with xs_reset_transport.
2087	*/
2088	static void xs_set_memalloc(struct rpc_xprt *xprt)
2089	{
2090	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2091	xprt);
2092
2093	/*
2094	* If there's no sock, then we have nothing to set. The
2095	* reconnecting process will get it for us.
2096	*/
2097	if (!transport->inet)
2098	return;
2099	if (atomic_read(v: &xprt->swapper))
2100	sk_set_memalloc(sk: transport->inet);
2101	}
2102
2103	/**
2104	* xs_enable_swap - Tag this transport as being used for swap.
2105	* @xprt: transport to tag
2106	*
2107	* Take a reference to this transport on behalf of the rpc_clnt, and
2108	* optionally mark it for swapping if it wasn't already.
2109	*/
2110	static int
2111	xs_enable_swap(struct rpc_xprt *xprt)
2112	{
2113	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2114
2115	mutex_lock(&xs->recv_mutex);
2116	if (atomic_inc_return(v: &xprt->swapper) == 1 &&
2117	xs->inet)
2118	sk_set_memalloc(sk: xs->inet);
2119	mutex_unlock(lock: &xs->recv_mutex);
2120	return 0;
2121	}
2122
2123	/**
2124	* xs_disable_swap - Untag this transport as being used for swap.
2125	* @xprt: transport to tag
2126	*
2127	* Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2128	* swapper refcount goes to 0, untag the socket as a memalloc socket.
2129	*/
2130	static void
2131	xs_disable_swap(struct rpc_xprt *xprt)
2132	{
2133	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2134
2135	mutex_lock(&xs->recv_mutex);
2136	if (atomic_dec_and_test(v: &xprt->swapper) &&
2137	xs->inet)
2138	sk_clear_memalloc(sk: xs->inet);
2139	mutex_unlock(lock: &xs->recv_mutex);
2140	}
2141	#else
2142	static void xs_set_memalloc(struct rpc_xprt *xprt)
2143	{
2144	}
2145
2146	static int
2147	xs_enable_swap(struct rpc_xprt *xprt)
2148	{
2149	return -EINVAL;
2150	}
2151
2152	static void
2153	xs_disable_swap(struct rpc_xprt *xprt)
2154	{
2155	}
2156	#endif
2157
2158	static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2159	{
2160	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2161
2162	if (!transport->inet) {
2163	struct sock *sk = sock->sk;
2164
2165	lock_sock(sk);
2166
2167	xs_save_old_callbacks(transport, sk);
2168
2169	sk->sk_user_data = xprt;
2170	sk->sk_data_ready = xs_data_ready;
2171	sk->sk_write_space = xs_udp_write_space;
2172	sk->sk_use_task_frag = false;
2173
2174	xprt_set_connected(xprt);
2175
2176	/* Reset to new socket */
2177	transport->sock = sock;
2178	transport->inet = sk;
2179
2180	xs_set_memalloc(xprt);
2181
2182	release_sock(sk);
2183	}
2184	xs_udp_do_set_buffer_size(xprt);
2185
2186	xprt->stat.connect_start = jiffies;
2187	}
2188
2189	static void xs_udp_setup_socket(struct work_struct *work)
2190	{
2191	struct sock_xprt *transport =
2192	container_of(work, struct sock_xprt, connect_worker.work);
2193	struct rpc_xprt *xprt = &transport->xprt;
2194	struct socket *sock;
2195	int status = -EIO;
2196	unsigned int pflags = current->flags;
2197
2198	if (atomic_read(v: &xprt->swapper))
2199	current->flags |= PF_MEMALLOC;
2200	sock = xs_create_sock(xprt, transport,
2201	family: xs_addr(xprt)->sa_family, type: SOCK_DGRAM,
2202	IPPROTO_UDP, reuseport: false);
2203	if (IS_ERR(ptr: sock))
2204	goto out;
2205
2206	dprintk("RPC: worker connecting xprt %p via %s to "
2207	"%s (port %s)\n", xprt,
2208	xprt->address_strings[RPC_DISPLAY_PROTO],
2209	xprt->address_strings[RPC_DISPLAY_ADDR],
2210	xprt->address_strings[RPC_DISPLAY_PORT]);
2211
2212	xs_udp_finish_connecting(xprt, sock);
2213	trace_rpc_socket_connect(xprt, socket: sock, error: 0);
2214	status = 0;
2215	out:
2216	xprt_clear_connecting(xprt);
2217	xprt_unlock_connect(xprt, transport);
2218	xprt_wake_pending_tasks(xprt, status);
2219	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2220	}
2221
2222	/**
2223	* xs_tcp_shutdown - gracefully shut down a TCP socket
2224	* @xprt: transport
2225	*
2226	* Initiates a graceful shutdown of the TCP socket by calling the
2227	* equivalent of shutdown(SHUT_RDWR);
2228	*/
2229	static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2230	{
2231	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2232	struct socket *sock = transport->sock;
2233	int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2234
2235	if (sock == NULL)
2236	return;
2237	if (!xprt->reuseport) {
2238	xs_close(xprt);
2239	return;
2240	}
2241	switch (skst) {
2242	case TCP_FIN_WAIT1:
2243	case TCP_FIN_WAIT2:
2244	case TCP_LAST_ACK:
2245	break;
2246	case TCP_ESTABLISHED:
2247	case TCP_CLOSE_WAIT:
2248	kernel_sock_shutdown(sock, how: SHUT_RDWR);
2249	trace_rpc_socket_shutdown(xprt, socket: sock);
2250	break;
2251	default:
2252	xs_reset_transport(transport);
2253	}
2254	}
2255
2256	static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2257	struct socket *sock)
2258	{
2259	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2260	struct net *net = sock_net(sk: sock->sk);
2261	unsigned long connect_timeout;
2262	unsigned long syn_retries;
2263	unsigned int keepidle;
2264	unsigned int keepcnt;
2265	unsigned int timeo;
2266	unsigned long t;
2267
2268	spin_lock(lock: &xprt->transport_lock);
2269	keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2270	keepcnt = xprt->timeout->to_retries + 1;
2271	timeo = jiffies_to_msecs(j: xprt->timeout->to_initval) *
2272	(xprt->timeout->to_retries + 1);
2273	clear_bit(XPRT_SOCK_UPD_TIMEOUT, addr: &transport->sock_state);
2274	spin_unlock(lock: &xprt->transport_lock);
2275
2276	/* TCP Keepalive options */
2277	sock_set_keepalive(sk: sock->sk);
2278	tcp_sock_set_keepidle(sk: sock->sk, val: keepidle);
2279	tcp_sock_set_keepintvl(sk: sock->sk, val: keepidle);
2280	tcp_sock_set_keepcnt(sk: sock->sk, val: keepcnt);
2281
2282	/* TCP user timeout (see RFC5482) */
2283	tcp_sock_set_user_timeout(sk: sock->sk, val: timeo);
2284
2285	/* Connect timeout */
2286	connect_timeout = max_t(unsigned long,
2287	DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2288	syn_retries = max_t(unsigned long,
2289	READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2290	for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2291	;
2292	if (t <= syn_retries)
2293	tcp_sock_set_syncnt(sk: sock->sk, val: t - 1);
2294	}
2295
2296	static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2297	unsigned long connect_timeout)
2298	{
2299	struct sock_xprt *transport =
2300	container_of(xprt, struct sock_xprt, xprt);
2301	struct rpc_timeout to;
2302	unsigned long initval;
2303
2304	memcpy(&to, xprt->timeout, sizeof(to));
2305	/* Arbitrary lower limit */
2306	initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2307	to.to_initval = initval;
2308	to.to_maxval = initval;
2309	to.to_retries = 0;
2310	memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2311	xprt->timeout = &transport->tcp_timeout;
2312	xprt->connect_timeout = connect_timeout;
2313	}
2314
2315	static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2316	unsigned long connect_timeout,
2317	unsigned long reconnect_timeout)
2318	{
2319	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2320
2321	spin_lock(lock: &xprt->transport_lock);
2322	if (reconnect_timeout < xprt->max_reconnect_timeout)
2323	xprt->max_reconnect_timeout = reconnect_timeout;
2324	if (connect_timeout < xprt->connect_timeout)
2325	xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2326	set_bit(XPRT_SOCK_UPD_TIMEOUT, addr: &transport->sock_state);
2327	spin_unlock(lock: &xprt->transport_lock);
2328	}
2329
2330	static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2331	{
2332	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2333
2334	if (!transport->inet) {
2335	struct sock *sk = sock->sk;
2336
2337	/* Avoid temporary address, they are bad for long-lived
2338	* connections such as NFS mounts.
2339	* RFC4941, section 3.6 suggests that:
2340	* Individual applications, which have specific
2341	* knowledge about the normal duration of connections,
2342	* MAY override this as appropriate.
2343	*/
2344	if (xs_addr(xprt)->sa_family == PF_INET6) {
2345	ip6_sock_set_addr_preferences(sk,
2346	IPV6_PREFER_SRC_PUBLIC);
2347	}
2348
2349	xs_tcp_set_socket_timeouts(xprt, sock);
2350	tcp_sock_set_nodelay(sk);
2351
2352	lock_sock(sk);
2353
2354	xs_save_old_callbacks(transport, sk);
2355
2356	sk->sk_user_data = xprt;
2357	sk->sk_data_ready = xs_data_ready;
2358	sk->sk_state_change = xs_tcp_state_change;
2359	sk->sk_write_space = xs_tcp_write_space;
2360	sk->sk_error_report = xs_error_report;
2361	sk->sk_use_task_frag = false;
2362
2363	/* socket options */
2364	sock_reset_flag(sk, flag: SOCK_LINGER);
2365
2366	xprt_clear_connected(xprt);
2367
2368	/* Reset to new socket */
2369	transport->sock = sock;
2370	transport->inet = sk;
2371
2372	release_sock(sk);
2373	}
2374
2375	if (!xprt_bound(xprt))
2376	return -ENOTCONN;
2377
2378	xs_set_memalloc(xprt);
2379
2380	xs_stream_start_connect(transport);
2381
2382	/* Tell the socket layer to start connecting... */
2383	set_bit(XPRT_SOCK_CONNECTING, addr: &transport->sock_state);
2384	return kernel_connect(sock, addr: xs_addr(xprt), addrlen: xprt->addrlen, O_NONBLOCK);
2385	}
2386
2387	/**
2388	* xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2389	* @work: queued work item
2390	*
2391	* Invoked by a work queue tasklet.
2392	*/
2393	static void xs_tcp_setup_socket(struct work_struct *work)
2394	{
2395	struct sock_xprt *transport =
2396	container_of(work, struct sock_xprt, connect_worker.work);
2397	struct socket *sock = transport->sock;
2398	struct rpc_xprt *xprt = &transport->xprt;
2399	int status;
2400	unsigned int pflags = current->flags;
2401
2402	if (atomic_read(v: &xprt->swapper))
2403	current->flags |= PF_MEMALLOC;
2404
2405	if (xprt_connected(xprt))
2406	goto out;
2407	if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2408	addr: &transport->sock_state) ||
2409	!sock) {
2410	xs_reset_transport(transport);
2411	sock = xs_create_sock(xprt, transport, family: xs_addr(xprt)->sa_family,
2412	type: SOCK_STREAM, IPPROTO_TCP, reuseport: true);
2413	if (IS_ERR(ptr: sock)) {
2414	xprt_wake_pending_tasks(xprt, status: PTR_ERR(ptr: sock));
2415	goto out;
2416	}
2417	}
2418
2419	dprintk("RPC: worker connecting xprt %p via %s to "
2420	"%s (port %s)\n", xprt,
2421	xprt->address_strings[RPC_DISPLAY_PROTO],
2422	xprt->address_strings[RPC_DISPLAY_ADDR],
2423	xprt->address_strings[RPC_DISPLAY_PORT]);
2424
2425	status = xs_tcp_finish_connecting(xprt, sock);
2426	trace_rpc_socket_connect(xprt, socket: sock, error: status);
2427	dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2428	xprt, -status, xprt_connected(xprt),
2429	sock->sk->sk_state);
2430	switch (status) {
2431	case 0:
2432	case -EINPROGRESS:
2433	/* SYN_SENT! */
2434	set_bit(XPRT_SOCK_CONNECT_SENT, addr: &transport->sock_state);
2435	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2436	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2437	fallthrough;
2438	case -EALREADY:
2439	goto out_unlock;
2440	case -EADDRNOTAVAIL:
2441	/* Source port number is unavailable. Try a new one! */
2442	transport->srcport = 0;
2443	status = -EAGAIN;
2444	break;
2445	case -EINVAL:
2446	/* Happens, for instance, if the user specified a link
2447	* local IPv6 address without a scope-id.
2448	*/
2449	case -ECONNREFUSED:
2450	case -ECONNRESET:
2451	case -ENETDOWN:
2452	case -ENETUNREACH:
2453	case -EHOSTUNREACH:
2454	case -EADDRINUSE:
2455	case -ENOBUFS:
2456	break;
2457	default:
2458	printk("%s: connect returned unhandled error %d\n",
2459	__func__, status);
2460	status = -EAGAIN;
2461	}
2462
2463	/* xs_tcp_force_close() wakes tasks with a fixed error code.
2464	* We need to wake them first to ensure the correct error code.
2465	*/
2466	xprt_wake_pending_tasks(xprt, status);
2467	xs_tcp_force_close(xprt);
2468	out:
2469	xprt_clear_connecting(xprt);
2470	out_unlock:
2471	xprt_unlock_connect(xprt, transport);
2472	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2473	}
2474
2475	/*
2476	* Transfer the connected socket to @upper_transport, then mark that
2477	* xprt CONNECTED.
2478	*/
2479	static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2480	struct sock_xprt *upper_transport)
2481	{
2482	struct sock_xprt *lower_transport =
2483	container_of(lower_xprt, struct sock_xprt, xprt);
2484	struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2485
2486	if (!upper_transport->inet) {
2487	struct socket *sock = lower_transport->sock;
2488	struct sock *sk = sock->sk;
2489
2490	/* Avoid temporary address, they are bad for long-lived
2491	* connections such as NFS mounts.
2492	* RFC4941, section 3.6 suggests that:
2493	* Individual applications, which have specific
2494	* knowledge about the normal duration of connections,
2495	* MAY override this as appropriate.
2496	*/
2497	if (xs_addr(xprt: upper_xprt)->sa_family == PF_INET6)
2498	ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2499
2500	xs_tcp_set_socket_timeouts(xprt: upper_xprt, sock);
2501	tcp_sock_set_nodelay(sk);
2502
2503	lock_sock(sk);
2504
2505	/* @sk is already connected, so it now has the RPC callbacks.
2506	* Reach into @lower_transport to save the original ones.
2507	*/
2508	upper_transport->old_data_ready = lower_transport->old_data_ready;
2509	upper_transport->old_state_change = lower_transport->old_state_change;
2510	upper_transport->old_write_space = lower_transport->old_write_space;
2511	upper_transport->old_error_report = lower_transport->old_error_report;
2512	sk->sk_user_data = upper_xprt;
2513
2514	/* socket options */
2515	sock_reset_flag(sk, flag: SOCK_LINGER);
2516
2517	xprt_clear_connected(xprt: upper_xprt);
2518
2519	upper_transport->sock = sock;
2520	upper_transport->inet = sk;
2521	upper_transport->file = lower_transport->file;
2522
2523	release_sock(sk);
2524
2525	/* Reset lower_transport before shutting down its clnt */
2526	mutex_lock(&lower_transport->recv_mutex);
2527	lower_transport->inet = NULL;
2528	lower_transport->sock = NULL;
2529	lower_transport->file = NULL;
2530
2531	xprt_clear_connected(xprt: lower_xprt);
2532	xs_sock_reset_connection_flags(xprt: lower_xprt);
2533	xs_stream_reset_connect(transport: lower_transport);
2534	mutex_unlock(lock: &lower_transport->recv_mutex);
2535	}
2536
2537	if (!xprt_bound(xprt: upper_xprt))
2538	return -ENOTCONN;
2539
2540	xs_set_memalloc(xprt: upper_xprt);
2541
2542	if (!xprt_test_and_set_connected(xprt: upper_xprt)) {
2543	upper_xprt->connect_cookie++;
2544	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2545	xprt_clear_connecting(xprt: upper_xprt);
2546
2547	upper_xprt->stat.connect_count++;
2548	upper_xprt->stat.connect_time += (long)jiffies -
2549	upper_xprt->stat.connect_start;
2550	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2551	}
2552	return 0;
2553	}
2554
2555	/**
2556	* xs_tls_handshake_done - TLS handshake completion handler
2557	* @data: address of xprt to wake
2558	* @status: status of handshake
2559	* @peerid: serial number of key containing the remote's identity
2560	*
2561	*/
2562	static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2563	{
2564	struct rpc_xprt *lower_xprt = data;
2565	struct sock_xprt *lower_transport =
2566	container_of(lower_xprt, struct sock_xprt, xprt);
2567
2568	lower_transport->xprt_err = status ? -EACCES : 0;
2569	complete(&lower_transport->handshake_done);
2570	xprt_put(xprt: lower_xprt);
2571	}
2572
2573	static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2574	{
2575	struct sock_xprt *lower_transport =
2576	container_of(lower_xprt, struct sock_xprt, xprt);
2577	struct tls_handshake_args args = {
2578	.ta_sock = lower_transport->sock,
2579	.ta_done = xs_tls_handshake_done,
2580	.ta_data = xprt_get(xprt: lower_xprt),
2581	.ta_peername = lower_xprt->servername,
2582	};
2583	struct sock *sk = lower_transport->inet;
2584	int rc;
2585
2586	init_completion(x: &lower_transport->handshake_done);
2587	set_bit(XPRT_SOCK_IGNORE_RECV, addr: &lower_transport->sock_state);
2588	lower_transport->xprt_err = -ETIMEDOUT;
2589	switch (xprtsec->policy) {
2590	case RPC_XPRTSEC_TLS_ANON:
2591	rc = tls_client_hello_anon(args: &args, GFP_KERNEL);
2592	if (rc)
2593	goto out_put_xprt;
2594	break;
2595	case RPC_XPRTSEC_TLS_X509:
2596	args.ta_my_cert = xprtsec->cert_serial;
2597	args.ta_my_privkey = xprtsec->privkey_serial;
2598	rc = tls_client_hello_x509(args: &args, GFP_KERNEL);
2599	if (rc)
2600	goto out_put_xprt;
2601	break;
2602	default:
2603	rc = -EACCES;
2604	goto out_put_xprt;
2605	}
2606
2607	rc = wait_for_completion_interruptible_timeout(x: &lower_transport->handshake_done,
2608	XS_TLS_HANDSHAKE_TO);
2609	if (rc <= 0) {
2610	if (!tls_handshake_cancel(sk)) {
2611	if (rc == 0)
2612	rc = -ETIMEDOUT;
2613	goto out_put_xprt;
2614	}
2615	}
2616
2617	rc = lower_transport->xprt_err;
2618
2619	out:
2620	xs_stream_reset_connect(transport: lower_transport);
2621	clear_bit(XPRT_SOCK_IGNORE_RECV, addr: &lower_transport->sock_state);
2622	return rc;
2623
2624	out_put_xprt:
2625	xprt_put(xprt: lower_xprt);
2626	goto out;
2627	}
2628
2629	/**
2630	* xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2631	* @work: queued work item
2632	*
2633	* Invoked by a work queue tasklet.
2634	*
2635	* For RPC-with-TLS, there is a two-stage connection process.
2636	*
2637	* The "upper-layer xprt" is visible to the RPC consumer. Once it has
2638	* been marked connected, the consumer knows that a TCP connection and
2639	* a TLS session have been established.
2640	*
2641	* A "lower-layer xprt", created in this function, handles the mechanics
2642	* of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2643	* then driving the TLS handshake. Once all that is complete, the upper
2644	* layer xprt is marked connected.
2645	*/
2646	static void xs_tcp_tls_setup_socket(struct work_struct *work)
2647	{
2648	struct sock_xprt *upper_transport =
2649	container_of(work, struct sock_xprt, connect_worker.work);
2650	struct rpc_clnt *upper_clnt = upper_transport->clnt;
2651	struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2652	struct rpc_create_args args = {
2653	.net = upper_xprt->xprt_net,
2654	.protocol = upper_xprt->prot,
2655	.address = (struct sockaddr *)&upper_xprt->addr,
2656	.addrsize = upper_xprt->addrlen,
2657	.timeout = upper_clnt->cl_timeout,
2658	.servername = upper_xprt->servername,
2659	.program = upper_clnt->cl_program,
2660	.prognumber = upper_clnt->cl_prog,
2661	.version = upper_clnt->cl_vers,
2662	.authflavor = RPC_AUTH_TLS,
2663	.cred = upper_clnt->cl_cred,
2664	.xprtsec = {
2665	.policy = RPC_XPRTSEC_NONE,
2666	},
2667	};
2668	unsigned int pflags = current->flags;
2669	struct rpc_clnt *lower_clnt;
2670	struct rpc_xprt *lower_xprt;
2671	int status;
2672
2673	if (atomic_read(v: &upper_xprt->swapper))
2674	current->flags |= PF_MEMALLOC;
2675
2676	xs_stream_start_connect(transport: upper_transport);
2677
2678	/* This implicitly sends an RPC_AUTH_TLS probe */
2679	lower_clnt = rpc_create(args: &args);
2680	if (IS_ERR(ptr: lower_clnt)) {
2681	trace_rpc_tls_unavailable(clnt: upper_clnt, xprt: upper_xprt);
2682	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2683	xprt_clear_connecting(xprt: upper_xprt);
2684	xprt_wake_pending_tasks(xprt: upper_xprt, status: PTR_ERR(ptr: lower_clnt));
2685	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2686	goto out_unlock;
2687	}
2688
2689	/* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2690	* the lower xprt.
2691	*/
2692	rcu_read_lock();
2693	lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2694	rcu_read_unlock();
2695
2696	if (wait_on_bit_lock(word: &lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2697	goto out_unlock;
2698
2699	status = xs_tls_handshake_sync(lower_xprt, xprtsec: &upper_xprt->xprtsec);
2700	if (status) {
2701	trace_rpc_tls_not_started(clnt: upper_clnt, xprt: upper_xprt);
2702	goto out_close;
2703	}
2704
2705	status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2706	if (status)
2707	goto out_close;
2708	xprt_release_write(lower_xprt, NULL);
2709
2710	trace_rpc_socket_connect(xprt: upper_xprt, socket: upper_transport->sock, error: 0);
2711	if (!xprt_test_and_set_connected(xprt: upper_xprt)) {
2712	upper_xprt->connect_cookie++;
2713	clear_bit(XPRT_SOCK_CONNECTING, addr: &upper_transport->sock_state);
2714	xprt_clear_connecting(xprt: upper_xprt);
2715
2716	upper_xprt->stat.connect_count++;
2717	upper_xprt->stat.connect_time += (long)jiffies -
2718	upper_xprt->stat.connect_start;
2719	xs_run_error_worker(transport: upper_transport, XPRT_SOCK_WAKE_PENDING);
2720	}
2721	rpc_shutdown_client(lower_clnt);
2722
2723	out_unlock:
2724	current_restore_flags(orig_flags: pflags, PF_MEMALLOC);
2725	upper_transport->clnt = NULL;
2726	xprt_unlock_connect(upper_xprt, upper_transport);
2727	return;
2728
2729	out_close:
2730	xprt_release_write(lower_xprt, NULL);
2731	rpc_shutdown_client(lower_clnt);
2732
2733	/* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2734	* Wake them first here to ensure they get our tk_status code.
2735	*/
2736	xprt_wake_pending_tasks(xprt: upper_xprt, status);
2737	xs_tcp_force_close(xprt: upper_xprt);
2738	xprt_clear_connecting(xprt: upper_xprt);
2739	goto out_unlock;
2740	}
2741
2742	/**
2743	* xs_connect - connect a socket to a remote endpoint
2744	* @xprt: pointer to transport structure
2745	* @task: address of RPC task that manages state of connect request
2746	*
2747	* TCP: If the remote end dropped the connection, delay reconnecting.
2748	*
2749	* UDP socket connects are synchronous, but we use a work queue anyway
2750	* to guarantee that even unprivileged user processes can set up a
2751	* socket on a privileged port.
2752	*
2753	* If a UDP socket connect fails, the delay behavior here prevents
2754	* retry floods (hard mounts).
2755	*/
2756	static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2757	{
2758	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2759	unsigned long delay = 0;
2760
2761	WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2762
2763	if (transport->sock != NULL) {
2764	dprintk("RPC: xs_connect delayed xprt %p for %lu "
2765	"seconds\n", xprt, xprt->reestablish_timeout / HZ);
2766
2767	delay = xprt_reconnect_delay(xprt);
2768	xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2769
2770	} else
2771	dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2772
2773	transport->clnt = task->tk_client;
2774	queue_delayed_work(wq: xprtiod_workqueue,
2775	dwork: &transport->connect_worker,
2776	delay);
2777	}
2778
2779	static void xs_wake_disconnect(struct sock_xprt *transport)
2780	{
2781	if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, addr: &transport->sock_state))
2782	xs_tcp_force_close(xprt: &transport->xprt);
2783	}
2784
2785	static void xs_wake_write(struct sock_xprt *transport)
2786	{
2787	if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, addr: &transport->sock_state))
2788	xprt_write_space(xprt: &transport->xprt);
2789	}
2790
2791	static void xs_wake_error(struct sock_xprt *transport)
2792	{
2793	int sockerr;
2794
2795	if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, addr: &transport->sock_state))
2796	return;
2797	sockerr = xchg(&transport->xprt_err, 0);
2798	if (sockerr < 0) {
2799	xprt_wake_pending_tasks(xprt: &transport->xprt, status: sockerr);
2800	xs_tcp_force_close(xprt: &transport->xprt);
2801	}
2802	}
2803
2804	static void xs_wake_pending(struct sock_xprt *transport)
2805	{
2806	if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, addr: &transport->sock_state))
2807	xprt_wake_pending_tasks(xprt: &transport->xprt, status: -EAGAIN);
2808	}
2809
2810	static void xs_error_handle(struct work_struct *work)
2811	{
2812	struct sock_xprt *transport = container_of(work,
2813	struct sock_xprt, error_worker);
2814
2815	xs_wake_disconnect(transport);
2816	xs_wake_write(transport);
2817	xs_wake_error(transport);
2818	xs_wake_pending(transport);
2819	}
2820
2821	/**
2822	* xs_local_print_stats - display AF_LOCAL socket-specific stats
2823	* @xprt: rpc_xprt struct containing statistics
2824	* @seq: output file
2825	*
2826	*/
2827	static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2828	{
2829	long idle_time = 0;
2830
2831	if (xprt_connected(xprt))
2832	idle_time = (long)(jiffies - xprt->last_used) / HZ;
2833
2834	seq_printf(m: seq, fmt: "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2835	"%llu %llu %lu %llu %llu\n",
2836	xprt->stat.bind_count,
2837	xprt->stat.connect_count,
2838	xprt->stat.connect_time / HZ,
2839	idle_time,
2840	xprt->stat.sends,
2841	xprt->stat.recvs,
2842	xprt->stat.bad_xids,
2843	xprt->stat.req_u,
2844	xprt->stat.bklog_u,
2845	xprt->stat.max_slots,
2846	xprt->stat.sending_u,
2847	xprt->stat.pending_u);
2848	}
2849
2850	/**
2851	* xs_udp_print_stats - display UDP socket-specific stats
2852	* @xprt: rpc_xprt struct containing statistics
2853	* @seq: output file
2854	*
2855	*/
2856	static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2857	{
2858	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2859
2860	seq_printf(m: seq, fmt: "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2861	"%lu %llu %llu\n",
2862	transport->srcport,
2863	xprt->stat.bind_count,
2864	xprt->stat.sends,
2865	xprt->stat.recvs,
2866	xprt->stat.bad_xids,
2867	xprt->stat.req_u,
2868	xprt->stat.bklog_u,
2869	xprt->stat.max_slots,
2870	xprt->stat.sending_u,
2871	xprt->stat.pending_u);
2872	}
2873
2874	/**
2875	* xs_tcp_print_stats - display TCP socket-specific stats
2876	* @xprt: rpc_xprt struct containing statistics
2877	* @seq: output file
2878	*
2879	*/
2880	static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2881	{
2882	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2883	long idle_time = 0;
2884
2885	if (xprt_connected(xprt))
2886	idle_time = (long)(jiffies - xprt->last_used) / HZ;
2887
2888	seq_printf(m: seq, fmt: "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2889	"%llu %llu %lu %llu %llu\n",
2890	transport->srcport,
2891	xprt->stat.bind_count,
2892	xprt->stat.connect_count,
2893	xprt->stat.connect_time / HZ,
2894	idle_time,
2895	xprt->stat.sends,
2896	xprt->stat.recvs,
2897	xprt->stat.bad_xids,
2898	xprt->stat.req_u,
2899	xprt->stat.bklog_u,
2900	xprt->stat.max_slots,
2901	xprt->stat.sending_u,
2902	xprt->stat.pending_u);
2903	}
2904
2905	/*
2906	* Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2907	* we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2908	* to use the server side send routines.
2909	*/
2910	static int bc_malloc(struct rpc_task *task)
2911	{
2912	struct rpc_rqst *rqst = task->tk_rqstp;
2913	size_t size = rqst->rq_callsize;
2914	struct page *page;
2915	struct rpc_buffer *buf;
2916
2917	if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2918	WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2919	size);
2920	return -EINVAL;
2921	}
2922
2923	page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2924	if (!page)
2925	return -ENOMEM;
2926
2927	buf = page_address(page);
2928	buf->len = PAGE_SIZE;
2929
2930	rqst->rq_buffer = buf->data;
2931	rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2932	return 0;
2933	}
2934
2935	/*
2936	* Free the space allocated in the bc_alloc routine
2937	*/
2938	static void bc_free(struct rpc_task *task)
2939	{
2940	void *buffer = task->tk_rqstp->rq_buffer;
2941	struct rpc_buffer *buf;
2942
2943	buf = container_of(buffer, struct rpc_buffer, data);
2944	free_page((unsigned long)buf);
2945	}
2946
2947	static int bc_sendto(struct rpc_rqst *req)
2948	{
2949	struct xdr_buf *xdr = &req->rq_snd_buf;
2950	struct sock_xprt *transport =
2951	container_of(req->rq_xprt, struct sock_xprt, xprt);
2952	struct msghdr msg = {
2953	.msg_flags = 0,
2954	};
2955	rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2956	(u32)xdr->len);
2957	unsigned int sent = 0;
2958	int err;
2959
2960	req->rq_xtime = ktime_get();
2961	err = xdr_alloc_bvec(buf: xdr, gfp: rpc_task_gfp_mask());
2962	if (err < 0)
2963	return err;
2964	err = xprt_sock_sendmsg(sock: transport->sock, msg: &msg, xdr, base: 0, marker, sent_p: &sent);
2965	xdr_free_bvec(buf: xdr);
2966	if (err < 0 || sent != (xdr->len + sizeof(marker)))
2967	return -EAGAIN;
2968	return sent;
2969	}
2970
2971	/**
2972	* bc_send_request - Send a backchannel Call on a TCP socket
2973	* @req: rpc_rqst containing Call message to be sent
2974	*
2975	* xpt_mutex ensures @rqstp's whole message is written to the socket
2976	* without interruption.
2977	*
2978	* Return values:
2979	* %0 if the message was sent successfully
2980	* %ENOTCONN if the message was not sent
2981	*/
2982	static int bc_send_request(struct rpc_rqst *req)
2983	{
2984	struct svc_xprt *xprt;
2985	int len;
2986
2987	/*
2988	* Get the server socket associated with this callback xprt
2989	*/
2990	xprt = req->rq_xprt->bc_xprt;
2991
2992	/*
2993	* Grab the mutex to serialize data as the connection is shared
2994	* with the fore channel
2995	*/
2996	mutex_lock(&xprt->xpt_mutex);
2997	if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2998	len = -ENOTCONN;
2999	else
3000	len = bc_sendto(req);
3001	mutex_unlock(lock: &xprt->xpt_mutex);
3002
3003	if (len > 0)
3004	len = 0;
3005
3006	return len;
3007	}
3008
3009	static void bc_close(struct rpc_xprt *xprt)
3010	{
3011	xprt_disconnect_done(xprt);
3012	}
3013
3014	static void bc_destroy(struct rpc_xprt *xprt)
3015	{
3016	dprintk("RPC: bc_destroy xprt %p\n", xprt);
3017
3018	xs_xprt_free(xprt);
3019	module_put(THIS_MODULE);
3020	}
3021
3022	static const struct rpc_xprt_ops xs_local_ops = {
3023	.reserve_xprt = xprt_reserve_xprt,
3024	.release_xprt = xprt_release_xprt,
3025	.alloc_slot = xprt_alloc_slot,
3026	.free_slot = xprt_free_slot,
3027	.rpcbind = xs_local_rpcbind,
3028	.set_port = xs_local_set_port,
3029	.connect = xs_local_connect,
3030	.buf_alloc = rpc_malloc,
3031	.buf_free = rpc_free,
3032	.prepare_request = xs_stream_prepare_request,
3033	.send_request = xs_local_send_request,
3034	.abort_send_request = xs_stream_abort_send_request,
3035	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3036	.close = xs_close,
3037	.destroy = xs_destroy,
3038	.print_stats = xs_local_print_stats,
3039	.enable_swap = xs_enable_swap,
3040	.disable_swap = xs_disable_swap,
3041	};
3042
3043	static const struct rpc_xprt_ops xs_udp_ops = {
3044	.set_buffer_size = xs_udp_set_buffer_size,
3045	.reserve_xprt = xprt_reserve_xprt_cong,
3046	.release_xprt = xprt_release_xprt_cong,
3047	.alloc_slot = xprt_alloc_slot,
3048	.free_slot = xprt_free_slot,
3049	.rpcbind = rpcb_getport_async,
3050	.set_port = xs_set_port,
3051	.connect = xs_connect,
3052	.get_srcaddr = xs_sock_srcaddr,
3053	.get_srcport = xs_sock_srcport,
3054	.buf_alloc = rpc_malloc,
3055	.buf_free = rpc_free,
3056	.send_request = xs_udp_send_request,
3057	.wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3058	.timer = xs_udp_timer,
3059	.release_request = xprt_release_rqst_cong,
3060	.close = xs_close,
3061	.destroy = xs_destroy,
3062	.print_stats = xs_udp_print_stats,
3063	.enable_swap = xs_enable_swap,
3064	.disable_swap = xs_disable_swap,
3065	.inject_disconnect = xs_inject_disconnect,
3066	};
3067
3068	static const struct rpc_xprt_ops xs_tcp_ops = {
3069	.reserve_xprt = xprt_reserve_xprt,
3070	.release_xprt = xprt_release_xprt,
3071	.alloc_slot = xprt_alloc_slot,
3072	.free_slot = xprt_free_slot,
3073	.rpcbind = rpcb_getport_async,
3074	.set_port = xs_set_port,
3075	.connect = xs_connect,
3076	.get_srcaddr = xs_sock_srcaddr,
3077	.get_srcport = xs_sock_srcport,
3078	.buf_alloc = rpc_malloc,
3079	.buf_free = rpc_free,
3080	.prepare_request = xs_stream_prepare_request,
3081	.send_request = xs_tcp_send_request,
3082	.abort_send_request = xs_stream_abort_send_request,
3083	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3084	.close = xs_tcp_shutdown,
3085	.destroy = xs_destroy,
3086	.set_connect_timeout = xs_tcp_set_connect_timeout,
3087	.print_stats = xs_tcp_print_stats,
3088	.enable_swap = xs_enable_swap,
3089	.disable_swap = xs_disable_swap,
3090	.inject_disconnect = xs_inject_disconnect,
3091	#ifdef CONFIG_SUNRPC_BACKCHANNEL
3092	.bc_setup = xprt_setup_bc,
3093	.bc_maxpayload = xs_tcp_bc_maxpayload,
3094	.bc_num_slots = xprt_bc_max_slots,
3095	.bc_free_rqst = xprt_free_bc_rqst,
3096	.bc_destroy = xprt_destroy_bc,
3097	#endif
3098	};
3099
3100	/*
3101	* The rpc_xprt_ops for the server backchannel
3102	*/
3103
3104	static const struct rpc_xprt_ops bc_tcp_ops = {
3105	.reserve_xprt = xprt_reserve_xprt,
3106	.release_xprt = xprt_release_xprt,
3107	.alloc_slot = xprt_alloc_slot,
3108	.free_slot = xprt_free_slot,
3109	.buf_alloc = bc_malloc,
3110	.buf_free = bc_free,
3111	.send_request = bc_send_request,
3112	.wait_for_reply_request = xprt_wait_for_reply_request_def,
3113	.close = bc_close,
3114	.destroy = bc_destroy,
3115	.print_stats = xs_tcp_print_stats,
3116	.enable_swap = xs_enable_swap,
3117	.disable_swap = xs_disable_swap,
3118	.inject_disconnect = xs_inject_disconnect,
3119	};
3120
3121	static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3122	{
3123	static const struct sockaddr_in sin = {
3124	.sin_family = AF_INET,
3125	.sin_addr.s_addr = htonl(INADDR_ANY),
3126	};
3127	static const struct sockaddr_in6 sin6 = {
3128	.sin6_family = AF_INET6,
3129	.sin6_addr = IN6ADDR_ANY_INIT,
3130	};
3131
3132	switch (family) {
3133	case AF_LOCAL:
3134	break;
3135	case AF_INET:
3136	memcpy(sap, &sin, sizeof(sin));
3137	break;
3138	case AF_INET6:
3139	memcpy(sap, &sin6, sizeof(sin6));
3140	break;
3141	default:
3142	dprintk("RPC: %s: Bad address family\n", __func__);
3143	return -EAFNOSUPPORT;
3144	}
3145	return 0;
3146	}
3147
3148	static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3149	unsigned int slot_table_size,
3150	unsigned int max_slot_table_size)
3151	{
3152	struct rpc_xprt *xprt;
3153	struct sock_xprt *new;
3154
3155	if (args->addrlen > sizeof(xprt->addr)) {
3156	dprintk("RPC: xs_setup_xprt: address too large\n");
3157	return ERR_PTR(error: -EBADF);
3158	}
3159
3160	xprt = xprt_alloc(net: args->net, size: sizeof(*new), num_prealloc: slot_table_size,
3161	max_req: max_slot_table_size);
3162	if (xprt == NULL) {
3163	dprintk("RPC: xs_setup_xprt: couldn't allocate "
3164	"rpc_xprt\n");
3165	return ERR_PTR(error: -ENOMEM);
3166	}
3167
3168	new = container_of(xprt, struct sock_xprt, xprt);
3169	mutex_init(&new->recv_mutex);
3170	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3171	xprt->addrlen = args->addrlen;
3172	if (args->srcaddr)
3173	memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3174	else {
3175	int err;
3176	err = xs_init_anyaddr(family: args->dstaddr->sa_family,
3177	sap: (struct sockaddr *)&new->srcaddr);
3178	if (err != 0) {
3179	xprt_free(xprt);
3180	return ERR_PTR(error: err);
3181	}
3182	}
3183
3184	return xprt;
3185	}
3186
3187	static const struct rpc_timeout xs_local_default_timeout = {
3188	.to_initval = 10 * HZ,
3189	.to_maxval = 10 * HZ,
3190	.to_retries = 2,
3191	};
3192
3193	/**
3194	* xs_setup_local - Set up transport to use an AF_LOCAL socket
3195	* @args: rpc transport creation arguments
3196	*
3197	* AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3198	*/
3199	static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3200	{
3201	struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3202	struct sock_xprt *transport;
3203	struct rpc_xprt *xprt;
3204	struct rpc_xprt *ret;
3205
3206	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3207	max_slot_table_size: xprt_max_tcp_slot_table_entries);
3208	if (IS_ERR(ptr: xprt))
3209	return xprt;
3210	transport = container_of(xprt, struct sock_xprt, xprt);
3211
3212	xprt->prot = 0;
3213	xprt->xprt_class = &xs_local_transport;
3214	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3215
3216	xprt->bind_timeout = XS_BIND_TO;
3217	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3218	xprt->idle_timeout = XS_IDLE_DISC_TO;
3219
3220	xprt->ops = &xs_local_ops;
3221	xprt->timeout = &xs_local_default_timeout;
3222
3223	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3224	INIT_WORK(&transport->error_worker, xs_error_handle);
3225	INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3226
3227	switch (sun->sun_family) {
3228	case AF_LOCAL:
3229	if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3230	dprintk("RPC: bad AF_LOCAL address: %s\n",
3231	sun->sun_path);
3232	ret = ERR_PTR(error: -EINVAL);
3233	goto out_err;
3234	}
3235	xprt_set_bound(xprt);
3236	xs_format_peer_addresses(xprt, protocol: "local", RPCBIND_NETID_LOCAL);
3237	break;
3238	default:
3239	ret = ERR_PTR(error: -EAFNOSUPPORT);
3240	goto out_err;
3241	}
3242
3243	dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3244	xprt->address_strings[RPC_DISPLAY_ADDR]);
3245
3246	if (try_module_get(THIS_MODULE))
3247	return xprt;
3248	ret = ERR_PTR(error: -EINVAL);
3249	out_err:
3250	xs_xprt_free(xprt);
3251	return ret;
3252	}
3253
3254	static const struct rpc_timeout xs_udp_default_timeout = {
3255	.to_initval = 5 * HZ,
3256	.to_maxval = 30 * HZ,
3257	.to_increment = 5 * HZ,
3258	.to_retries = 5,
3259	};
3260
3261	/**
3262	* xs_setup_udp - Set up transport to use a UDP socket
3263	* @args: rpc transport creation arguments
3264	*
3265	*/
3266	static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3267	{
3268	struct sockaddr *addr = args->dstaddr;
3269	struct rpc_xprt *xprt;
3270	struct sock_xprt *transport;
3271	struct rpc_xprt *ret;
3272
3273	xprt = xs_setup_xprt(args, slot_table_size: xprt_udp_slot_table_entries,
3274	max_slot_table_size: xprt_udp_slot_table_entries);
3275	if (IS_ERR(ptr: xprt))
3276	return xprt;
3277	transport = container_of(xprt, struct sock_xprt, xprt);
3278
3279	xprt->prot = IPPROTO_UDP;
3280	xprt->xprt_class = &xs_udp_transport;
3281	/* XXX: header size can vary due to auth type, IPv6, etc. */
3282	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3283
3284	xprt->bind_timeout = XS_BIND_TO;
3285	xprt->reestablish_timeout = XS_UDP_REEST_TO;
3286	xprt->idle_timeout = XS_IDLE_DISC_TO;
3287
3288	xprt->ops = &xs_udp_ops;
3289
3290	xprt->timeout = &xs_udp_default_timeout;
3291
3292	INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3293	INIT_WORK(&transport->error_worker, xs_error_handle);
3294	INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3295
3296	switch (addr->sa_family) {
3297	case AF_INET:
3298	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3299	xprt_set_bound(xprt);
3300
3301	xs_format_peer_addresses(xprt, protocol: "udp", RPCBIND_NETID_UDP);
3302	break;
3303	case AF_INET6:
3304	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3305	xprt_set_bound(xprt);
3306
3307	xs_format_peer_addresses(xprt, protocol: "udp", RPCBIND_NETID_UDP6);
3308	break;
3309	default:
3310	ret = ERR_PTR(error: -EAFNOSUPPORT);
3311	goto out_err;
3312	}
3313
3314	if (xprt_bound(xprt))
3315	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3316	xprt->address_strings[RPC_DISPLAY_ADDR],
3317	xprt->address_strings[RPC_DISPLAY_PORT],
3318	xprt->address_strings[RPC_DISPLAY_PROTO]);
3319	else
3320	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3321	xprt->address_strings[RPC_DISPLAY_ADDR],
3322	xprt->address_strings[RPC_DISPLAY_PROTO]);
3323
3324	if (try_module_get(THIS_MODULE))
3325	return xprt;
3326	ret = ERR_PTR(error: -EINVAL);
3327	out_err:
3328	xs_xprt_free(xprt);
3329	return ret;
3330	}
3331
3332	static const struct rpc_timeout xs_tcp_default_timeout = {
3333	.to_initval = 60 * HZ,
3334	.to_maxval = 60 * HZ,
3335	.to_retries = 2,
3336	};
3337
3338	/**
3339	* xs_setup_tcp - Set up transport to use a TCP socket
3340	* @args: rpc transport creation arguments
3341	*
3342	*/
3343	static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3344	{
3345	struct sockaddr *addr = args->dstaddr;
3346	struct rpc_xprt *xprt;
3347	struct sock_xprt *transport;
3348	struct rpc_xprt *ret;
3349	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3350
3351	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3352	max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3353
3354	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3355	max_slot_table_size);
3356	if (IS_ERR(ptr: xprt))
3357	return xprt;
3358	transport = container_of(xprt, struct sock_xprt, xprt);
3359
3360	xprt->prot = IPPROTO_TCP;
3361	xprt->xprt_class = &xs_tcp_transport;
3362	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3363
3364	xprt->bind_timeout = XS_BIND_TO;
3365	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3366	xprt->idle_timeout = XS_IDLE_DISC_TO;
3367
3368	xprt->ops = &xs_tcp_ops;
3369	xprt->timeout = &xs_tcp_default_timeout;
3370
3371	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3372	if (args->reconnect_timeout)
3373	xprt->max_reconnect_timeout = args->reconnect_timeout;
3374
3375	xprt->connect_timeout = xprt->timeout->to_initval *
3376	(xprt->timeout->to_retries + 1);
3377	if (args->connect_timeout)
3378	xs_tcp_do_set_connect_timeout(xprt, connect_timeout: args->connect_timeout);
3379
3380	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3381	INIT_WORK(&transport->error_worker, xs_error_handle);
3382	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3383
3384	switch (addr->sa_family) {
3385	case AF_INET:
3386	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3387	xprt_set_bound(xprt);
3388
3389	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP);
3390	break;
3391	case AF_INET6:
3392	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3393	xprt_set_bound(xprt);
3394
3395	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP6);
3396	break;
3397	default:
3398	ret = ERR_PTR(error: -EAFNOSUPPORT);
3399	goto out_err;
3400	}
3401
3402	if (xprt_bound(xprt))
3403	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3404	xprt->address_strings[RPC_DISPLAY_ADDR],
3405	xprt->address_strings[RPC_DISPLAY_PORT],
3406	xprt->address_strings[RPC_DISPLAY_PROTO]);
3407	else
3408	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3409	xprt->address_strings[RPC_DISPLAY_ADDR],
3410	xprt->address_strings[RPC_DISPLAY_PROTO]);
3411
3412	if (try_module_get(THIS_MODULE))
3413	return xprt;
3414	ret = ERR_PTR(error: -EINVAL);
3415	out_err:
3416	xs_xprt_free(xprt);
3417	return ret;
3418	}
3419
3420	/**
3421	* xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3422	* @args: rpc transport creation arguments
3423	*
3424	*/
3425	static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3426	{
3427	struct sockaddr *addr = args->dstaddr;
3428	struct rpc_xprt *xprt;
3429	struct sock_xprt *transport;
3430	struct rpc_xprt *ret;
3431	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3432
3433	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3434	max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3435
3436	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3437	max_slot_table_size);
3438	if (IS_ERR(ptr: xprt))
3439	return xprt;
3440	transport = container_of(xprt, struct sock_xprt, xprt);
3441
3442	xprt->prot = IPPROTO_TCP;
3443	xprt->xprt_class = &xs_tcp_transport;
3444	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3445
3446	xprt->bind_timeout = XS_BIND_TO;
3447	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3448	xprt->idle_timeout = XS_IDLE_DISC_TO;
3449
3450	xprt->ops = &xs_tcp_ops;
3451	xprt->timeout = &xs_tcp_default_timeout;
3452
3453	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3454	xprt->connect_timeout = xprt->timeout->to_initval *
3455	(xprt->timeout->to_retries + 1);
3456
3457	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3458	INIT_WORK(&transport->error_worker, xs_error_handle);
3459
3460	switch (args->xprtsec.policy) {
3461	case RPC_XPRTSEC_TLS_ANON:
3462	case RPC_XPRTSEC_TLS_X509:
3463	xprt->xprtsec = args->xprtsec;
3464	INIT_DELAYED_WORK(&transport->connect_worker,
3465	xs_tcp_tls_setup_socket);
3466	break;
3467	default:
3468	ret = ERR_PTR(error: -EACCES);
3469	goto out_err;
3470	}
3471
3472	switch (addr->sa_family) {
3473	case AF_INET:
3474	if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3475	xprt_set_bound(xprt);
3476
3477	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP);
3478	break;
3479	case AF_INET6:
3480	if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3481	xprt_set_bound(xprt);
3482
3483	xs_format_peer_addresses(xprt, protocol: "tcp", RPCBIND_NETID_TCP6);
3484	break;
3485	default:
3486	ret = ERR_PTR(error: -EAFNOSUPPORT);
3487	goto out_err;
3488	}
3489
3490	if (xprt_bound(xprt))
3491	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3492	xprt->address_strings[RPC_DISPLAY_ADDR],
3493	xprt->address_strings[RPC_DISPLAY_PORT],
3494	xprt->address_strings[RPC_DISPLAY_PROTO]);
3495	else
3496	dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3497	xprt->address_strings[RPC_DISPLAY_ADDR],
3498	xprt->address_strings[RPC_DISPLAY_PROTO]);
3499
3500	if (try_module_get(THIS_MODULE))
3501	return xprt;
3502	ret = ERR_PTR(error: -EINVAL);
3503	out_err:
3504	xs_xprt_free(xprt);
3505	return ret;
3506	}
3507
3508	/**
3509	* xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3510	* @args: rpc transport creation arguments
3511	*
3512	*/
3513	static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3514	{
3515	struct sockaddr *addr = args->dstaddr;
3516	struct rpc_xprt *xprt;
3517	struct sock_xprt *transport;
3518	struct svc_sock *bc_sock;
3519	struct rpc_xprt *ret;
3520
3521	xprt = xs_setup_xprt(args, slot_table_size: xprt_tcp_slot_table_entries,
3522	max_slot_table_size: xprt_tcp_slot_table_entries);
3523	if (IS_ERR(ptr: xprt))
3524	return xprt;
3525	transport = container_of(xprt, struct sock_xprt, xprt);
3526
3527	xprt->prot = IPPROTO_TCP;
3528	xprt->xprt_class = &xs_bc_tcp_transport;
3529	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3530	xprt->timeout = &xs_tcp_default_timeout;
3531
3532	/* backchannel */
3533	xprt_set_bound(xprt);
3534	xprt->bind_timeout = 0;
3535	xprt->reestablish_timeout = 0;
3536	xprt->idle_timeout = 0;
3537
3538	xprt->ops = &bc_tcp_ops;
3539
3540	switch (addr->sa_family) {
3541	case AF_INET:
3542	xs_format_peer_addresses(xprt, protocol: "tcp",
3543	RPCBIND_NETID_TCP);
3544	break;
3545	case AF_INET6:
3546	xs_format_peer_addresses(xprt, protocol: "tcp",
3547	RPCBIND_NETID_TCP6);
3548	break;
3549	default:
3550	ret = ERR_PTR(error: -EAFNOSUPPORT);
3551	goto out_err;
3552	}
3553
3554	dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3555	xprt->address_strings[RPC_DISPLAY_ADDR],
3556	xprt->address_strings[RPC_DISPLAY_PORT],
3557	xprt->address_strings[RPC_DISPLAY_PROTO]);
3558
3559	/*
3560	* Once we've associated a backchannel xprt with a connection,
3561	* we want to keep it around as long as the connection lasts,
3562	* in case we need to start using it for a backchannel again;
3563	* this reference won't be dropped until bc_xprt is destroyed.
3564	*/
3565	xprt_get(xprt);
3566	args->bc_xprt->xpt_bc_xprt = xprt;
3567	xprt->bc_xprt = args->bc_xprt;
3568	bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3569	transport->sock = bc_sock->sk_sock;
3570	transport->inet = bc_sock->sk_sk;
3571
3572	/*
3573	* Since we don't want connections for the backchannel, we set
3574	* the xprt status to connected
3575	*/
3576	xprt_set_connected(xprt);
3577
3578	if (try_module_get(THIS_MODULE))
3579	return xprt;
3580
3581	args->bc_xprt->xpt_bc_xprt = NULL;
3582	args->bc_xprt->xpt_bc_xps = NULL;
3583	xprt_put(xprt);
3584	ret = ERR_PTR(error: -EINVAL);
3585	out_err:
3586	xs_xprt_free(xprt);
3587	return ret;
3588	}
3589
3590	static struct xprt_class xs_local_transport = {
3591	.list = LIST_HEAD_INIT(xs_local_transport.list),
3592	.name = "named UNIX socket",
3593	.owner = THIS_MODULE,
3594	.ident = XPRT_TRANSPORT_LOCAL,
3595	.setup = xs_setup_local,
3596	.netid = { "" },
3597	};
3598
3599	static struct xprt_class xs_udp_transport = {
3600	.list = LIST_HEAD_INIT(xs_udp_transport.list),
3601	.name = "udp",
3602	.owner = THIS_MODULE,
3603	.ident = XPRT_TRANSPORT_UDP,
3604	.setup = xs_setup_udp,
3605	.netid = { "udp", "udp6", "" },
3606	};
3607
3608	static struct xprt_class xs_tcp_transport = {
3609	.list = LIST_HEAD_INIT(xs_tcp_transport.list),
3610	.name = "tcp",
3611	.owner = THIS_MODULE,
3612	.ident = XPRT_TRANSPORT_TCP,
3613	.setup = xs_setup_tcp,
3614	.netid = { "tcp", "tcp6", "" },
3615	};
3616
3617	static struct xprt_class xs_tcp_tls_transport = {
3618	.list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3619	.name = "tcp-with-tls",
3620	.owner = THIS_MODULE,
3621	.ident = XPRT_TRANSPORT_TCP_TLS,
3622	.setup = xs_setup_tcp_tls,
3623	.netid = { "tcp", "tcp6", "" },
3624	};
3625
3626	static struct xprt_class xs_bc_tcp_transport = {
3627	.list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3628	.name = "tcp NFSv4.1 backchannel",
3629	.owner = THIS_MODULE,
3630	.ident = XPRT_TRANSPORT_BC_TCP,
3631	.setup = xs_setup_bc_tcp,
3632	.netid = { "" },
3633	};
3634
3635	/**
3636	* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3637	*
3638	*/
3639	int init_socket_xprt(void)
3640	{
3641	if (!sunrpc_table_header)
3642	sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3643
3644	xprt_register_transport(type: &xs_local_transport);
3645	xprt_register_transport(type: &xs_udp_transport);
3646	xprt_register_transport(type: &xs_tcp_transport);
3647	xprt_register_transport(type: &xs_tcp_tls_transport);
3648	xprt_register_transport(type: &xs_bc_tcp_transport);
3649
3650	return 0;
3651	}
3652
3653	/**
3654	* cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3655	*
3656	*/
3657	void cleanup_socket_xprt(void)
3658	{
3659	if (sunrpc_table_header) {
3660	unregister_sysctl_table(table: sunrpc_table_header);
3661	sunrpc_table_header = NULL;
3662	}
3663
3664	xprt_unregister_transport(type: &xs_local_transport);
3665	xprt_unregister_transport(type: &xs_udp_transport);
3666	xprt_unregister_transport(type: &xs_tcp_transport);
3667	xprt_unregister_transport(type: &xs_tcp_tls_transport);
3668	xprt_unregister_transport(type: &xs_bc_tcp_transport);
3669	}
3670
3671	static int param_set_portnr(const char *val, const struct kernel_param *kp)
3672	{
3673	return param_set_uint_minmax(val, kp,
3674	RPC_MIN_RESVPORT,
3675	RPC_MAX_RESVPORT);
3676	}
3677
3678	static const struct kernel_param_ops param_ops_portnr = {
3679	.set = param_set_portnr,
3680	.get = param_get_uint,
3681	};
3682
3683	#define param_check_portnr(name, p) \
3684	__param_check(name, p, unsigned int);
3685
3686	module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3687	module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3688
3689	static int param_set_slot_table_size(const char *val,
3690	const struct kernel_param *kp)
3691	{
3692	return param_set_uint_minmax(val, kp,
3693	RPC_MIN_SLOT_TABLE,
3694	RPC_MAX_SLOT_TABLE);
3695	}
3696
3697	static const struct kernel_param_ops param_ops_slot_table_size = {
3698	.set = param_set_slot_table_size,
3699	.get = param_get_uint,
3700	};
3701
3702	#define param_check_slot_table_size(name, p) \
3703	__param_check(name, p, unsigned int);
3704
3705	static int param_set_max_slot_table_size(const char *val,
3706	const struct kernel_param *kp)
3707	{
3708	return param_set_uint_minmax(val, kp,
3709	RPC_MIN_SLOT_TABLE,
3710	RPC_MAX_SLOT_TABLE_LIMIT);
3711	}
3712
3713	static const struct kernel_param_ops param_ops_max_slot_table_size = {
3714	.set = param_set_max_slot_table_size,
3715	.get = param_get_uint,
3716	};
3717
3718	#define param_check_max_slot_table_size(name, p) \
3719	__param_check(name, p, unsigned int);
3720
3721	module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3722	slot_table_size, 0644);
3723	module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3724	max_slot_table_size, 0644);
3725	module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3726	slot_table_size, 0644);
3727