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