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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 <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "socklib.h"
58#include "sunrpc.h"
59
60static void xs_close(struct rpc_xprt *xprt);
61static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
62static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
63 struct socket *sock);
64
65/*
66 * xprtsock tunables
67 */
68static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
69static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
70static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
71
72static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
73static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
74
75#define XS_TCP_LINGER_TO (15U * HZ)
76static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
77
78/*
79 * We can register our own files under /proc/sys/sunrpc by
80 * calling register_sysctl_table() again. The files in that
81 * directory become the union of all files registered there.
82 *
83 * We simply need to make sure that we don't collide with
84 * someone else's file names!
85 */
86
87static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
88static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
89static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
90static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
91static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
92
93static struct ctl_table_header *sunrpc_table_header;
94
95static struct xprt_class xs_local_transport;
96static struct xprt_class xs_udp_transport;
97static struct xprt_class xs_tcp_transport;
98static struct xprt_class xs_bc_tcp_transport;
99
100/*
101 * FIXME: changing the UDP slot table size should also resize the UDP
102 * socket buffers for existing UDP transports
103 */
104static struct ctl_table xs_tunables_table[] = {
105 {
106 .procname = "udp_slot_table_entries",
107 .data = &xprt_udp_slot_table_entries,
108 .maxlen = sizeof(unsigned int),
109 .mode = 0644,
110 .proc_handler = proc_dointvec_minmax,
111 .extra1 = &min_slot_table_size,
112 .extra2 = &max_slot_table_size
113 },
114 {
115 .procname = "tcp_slot_table_entries",
116 .data = &xprt_tcp_slot_table_entries,
117 .maxlen = sizeof(unsigned int),
118 .mode = 0644,
119 .proc_handler = proc_dointvec_minmax,
120 .extra1 = &min_slot_table_size,
121 .extra2 = &max_slot_table_size
122 },
123 {
124 .procname = "tcp_max_slot_table_entries",
125 .data = &xprt_max_tcp_slot_table_entries,
126 .maxlen = sizeof(unsigned int),
127 .mode = 0644,
128 .proc_handler = proc_dointvec_minmax,
129 .extra1 = &min_slot_table_size,
130 .extra2 = &max_tcp_slot_table_limit
131 },
132 {
133 .procname = "min_resvport",
134 .data = &xprt_min_resvport,
135 .maxlen = sizeof(unsigned int),
136 .mode = 0644,
137 .proc_handler = proc_dointvec_minmax,
138 .extra1 = &xprt_min_resvport_limit,
139 .extra2 = &xprt_max_resvport_limit
140 },
141 {
142 .procname = "max_resvport",
143 .data = &xprt_max_resvport,
144 .maxlen = sizeof(unsigned int),
145 .mode = 0644,
146 .proc_handler = proc_dointvec_minmax,
147 .extra1 = &xprt_min_resvport_limit,
148 .extra2 = &xprt_max_resvport_limit
149 },
150 {
151 .procname = "tcp_fin_timeout",
152 .data = &xs_tcp_fin_timeout,
153 .maxlen = sizeof(xs_tcp_fin_timeout),
154 .mode = 0644,
155 .proc_handler = proc_dointvec_jiffies,
156 },
157 { },
158};
159
160static struct ctl_table sunrpc_table[] = {
161 {
162 .procname = "sunrpc",
163 .mode = 0555,
164 .child = xs_tunables_table
165 },
166 { },
167};
168
169/*
170 * Wait duration for a reply from the RPC portmapper.
171 */
172#define XS_BIND_TO (60U * HZ)
173
174/*
175 * Delay if a UDP socket connect error occurs. This is most likely some
176 * kind of resource problem on the local host.
177 */
178#define XS_UDP_REEST_TO (2U * HZ)
179
180/*
181 * The reestablish timeout allows clients to delay for a bit before attempting
182 * to reconnect to a server that just dropped our connection.
183 *
184 * We implement an exponential backoff when trying to reestablish a TCP
185 * transport connection with the server. Some servers like to drop a TCP
186 * connection when they are overworked, so we start with a short timeout and
187 * increase over time if the server is down or not responding.
188 */
189#define XS_TCP_INIT_REEST_TO (3U * HZ)
190
191/*
192 * TCP idle timeout; client drops the transport socket if it is idle
193 * for this long. Note that we also timeout UDP sockets to prevent
194 * holding port numbers when there is no RPC traffic.
195 */
196#define XS_IDLE_DISC_TO (5U * 60 * HZ)
197
198#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
199# undef RPC_DEBUG_DATA
200# define RPCDBG_FACILITY RPCDBG_TRANS
201#endif
202
203#ifdef RPC_DEBUG_DATA
204static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
205{
206 u8 *buf = (u8 *) packet;
207 int j;
208
209 dprintk("RPC: %s\n", msg);
210 for (j = 0; j < count && j < 128; j += 4) {
211 if (!(j & 31)) {
212 if (j)
213 dprintk("\n");
214 dprintk("0x%04x ", j);
215 }
216 dprintk("%02x%02x%02x%02x ",
217 buf[j], buf[j+1], buf[j+2], buf[j+3]);
218 }
219 dprintk("\n");
220}
221#else
222static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
223{
224 /* NOP */
225}
226#endif
227
228static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
229{
230 return (struct rpc_xprt *) sk->sk_user_data;
231}
232
233static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
234{
235 return (struct sockaddr *) &xprt->addr;
236}
237
238static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
239{
240 return (struct sockaddr_un *) &xprt->addr;
241}
242
243static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
244{
245 return (struct sockaddr_in *) &xprt->addr;
246}
247
248static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
249{
250 return (struct sockaddr_in6 *) &xprt->addr;
251}
252
253static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
254{
255 struct sockaddr *sap = xs_addr(xprt);
256 struct sockaddr_in6 *sin6;
257 struct sockaddr_in *sin;
258 struct sockaddr_un *sun;
259 char buf[128];
260
261 switch (sap->sa_family) {
262 case AF_LOCAL:
263 sun = xs_addr_un(xprt);
264 strscpy(buf, sun->sun_path, sizeof(buf));
265 xprt->address_strings[RPC_DISPLAY_ADDR] =
266 kstrdup(buf, GFP_KERNEL);
267 break;
268 case AF_INET:
269 (void)rpc_ntop(sap, buf, sizeof(buf));
270 xprt->address_strings[RPC_DISPLAY_ADDR] =
271 kstrdup(buf, GFP_KERNEL);
272 sin = xs_addr_in(xprt);
273 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
274 break;
275 case AF_INET6:
276 (void)rpc_ntop(sap, buf, sizeof(buf));
277 xprt->address_strings[RPC_DISPLAY_ADDR] =
278 kstrdup(buf, GFP_KERNEL);
279 sin6 = xs_addr_in6(xprt);
280 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
281 break;
282 default:
283 BUG();
284 }
285
286 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
287}
288
289static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
290{
291 struct sockaddr *sap = xs_addr(xprt);
292 char buf[128];
293
294 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
295 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
296
297 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
298 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
299}
300
301static void xs_format_peer_addresses(struct rpc_xprt *xprt,
302 const char *protocol,
303 const char *netid)
304{
305 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
306 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
307 xs_format_common_peer_addresses(xprt);
308 xs_format_common_peer_ports(xprt);
309}
310
311static void xs_update_peer_port(struct rpc_xprt *xprt)
312{
313 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
314 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
315
316 xs_format_common_peer_ports(xprt);
317}
318
319static void xs_free_peer_addresses(struct rpc_xprt *xprt)
320{
321 unsigned int i;
322
323 for (i = 0; i < RPC_DISPLAY_MAX; i++)
324 switch (i) {
325 case RPC_DISPLAY_PROTO:
326 case RPC_DISPLAY_NETID:
327 continue;
328 default:
329 kfree(xprt->address_strings[i]);
330 }
331}
332
333static size_t
334xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
335{
336 size_t i,n;
337
338 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
339 return want;
340 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
341 for (i = 0; i < n; i++) {
342 if (buf->pages[i])
343 continue;
344 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
345 if (!buf->pages[i]) {
346 i *= PAGE_SIZE;
347 return i > buf->page_base ? i - buf->page_base : 0;
348 }
349 }
350 return want;
351}
352
353static ssize_t
354xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
355{
356 ssize_t ret;
357 if (seek != 0)
358 iov_iter_advance(&msg->msg_iter, seek);
359 ret = sock_recvmsg(sock, msg, flags);
360 return ret > 0 ? ret + seek : ret;
361}
362
363static ssize_t
364xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
365 struct kvec *kvec, size_t count, size_t seek)
366{
367 iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
368 return xs_sock_recvmsg(sock, msg, flags, seek);
369}
370
371static ssize_t
372xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
373 struct bio_vec *bvec, unsigned long nr, size_t count,
374 size_t seek)
375{
376 iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
377 return xs_sock_recvmsg(sock, msg, flags, seek);
378}
379
380static ssize_t
381xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
382 size_t count)
383{
384 iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
385 return sock_recvmsg(sock, msg, flags);
386}
387
388#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
389static void
390xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
391{
392 struct bvec_iter bi = {
393 .bi_size = count,
394 };
395 struct bio_vec bv;
396
397 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
398 for_each_bvec(bv, bvec, bi, bi)
399 flush_dcache_page(bv.bv_page);
400}
401#else
402static inline void
403xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
404{
405}
406#endif
407
408static ssize_t
409xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
410 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
411{
412 size_t want, seek_init = seek, offset = 0;
413 ssize_t ret;
414
415 want = min_t(size_t, count, buf->head[0].iov_len);
416 if (seek < want) {
417 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
418 if (ret <= 0)
419 goto sock_err;
420 offset += ret;
421 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
422 goto out;
423 if (ret != want)
424 goto out;
425 seek = 0;
426 } else {
427 seek -= want;
428 offset += want;
429 }
430
431 want = xs_alloc_sparse_pages(
432 buf, min_t(size_t, count - offset, buf->page_len),
433 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
434 if (seek < want) {
435 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
436 xdr_buf_pagecount(buf),
437 want + buf->page_base,
438 seek + buf->page_base);
439 if (ret <= 0)
440 goto sock_err;
441 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
442 ret -= buf->page_base;
443 offset += ret;
444 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
445 goto out;
446 if (ret != want)
447 goto out;
448 seek = 0;
449 } else {
450 seek -= want;
451 offset += want;
452 }
453
454 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
455 if (seek < want) {
456 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
457 if (ret <= 0)
458 goto sock_err;
459 offset += ret;
460 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
461 goto out;
462 if (ret != want)
463 goto out;
464 } else if (offset < seek_init)
465 offset = seek_init;
466 ret = -EMSGSIZE;
467out:
468 *read = offset - seek_init;
469 return ret;
470sock_err:
471 offset += seek;
472 goto out;
473}
474
475static void
476xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
477{
478 if (!transport->recv.copied) {
479 if (buf->head[0].iov_len >= transport->recv.offset)
480 memcpy(buf->head[0].iov_base,
481 &transport->recv.xid,
482 transport->recv.offset);
483 transport->recv.copied = transport->recv.offset;
484 }
485}
486
487static bool
488xs_read_stream_request_done(struct sock_xprt *transport)
489{
490 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
491}
492
493static void
494xs_read_stream_check_eor(struct sock_xprt *transport,
495 struct msghdr *msg)
496{
497 if (xs_read_stream_request_done(transport))
498 msg->msg_flags |= MSG_EOR;
499}
500
501static ssize_t
502xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
503 int flags, struct rpc_rqst *req)
504{
505 struct xdr_buf *buf = &req->rq_private_buf;
506 size_t want, read;
507 ssize_t ret;
508
509 xs_read_header(transport, buf);
510
511 want = transport->recv.len - transport->recv.offset;
512 if (want != 0) {
513 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
514 transport->recv.copied + want,
515 transport->recv.copied,
516 &read);
517 transport->recv.offset += read;
518 transport->recv.copied += read;
519 }
520
521 if (transport->recv.offset == transport->recv.len)
522 xs_read_stream_check_eor(transport, msg);
523
524 if (want == 0)
525 return 0;
526
527 switch (ret) {
528 default:
529 break;
530 case -EFAULT:
531 case -EMSGSIZE:
532 msg->msg_flags |= MSG_TRUNC;
533 return read;
534 case 0:
535 return -ESHUTDOWN;
536 }
537 return ret < 0 ? ret : read;
538}
539
540static size_t
541xs_read_stream_headersize(bool isfrag)
542{
543 if (isfrag)
544 return sizeof(__be32);
545 return 3 * sizeof(__be32);
546}
547
548static ssize_t
549xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
550 int flags, size_t want, size_t seek)
551{
552 struct kvec kvec = {
553 .iov_base = &transport->recv.fraghdr,
554 .iov_len = want,
555 };
556 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
557}
558
559#if defined(CONFIG_SUNRPC_BACKCHANNEL)
560static ssize_t
561xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
562{
563 struct rpc_xprt *xprt = &transport->xprt;
564 struct rpc_rqst *req;
565 ssize_t ret;
566
567 /* Is this transport associated with the backchannel? */
568 if (!xprt->bc_serv)
569 return -ESHUTDOWN;
570
571 /* Look up and lock the request corresponding to the given XID */
572 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
573 if (!req) {
574 printk(KERN_WARNING "Callback slot table overflowed\n");
575 return -ESHUTDOWN;
576 }
577 if (transport->recv.copied && !req->rq_private_buf.len)
578 return -ESHUTDOWN;
579
580 ret = xs_read_stream_request(transport, msg, flags, req);
581 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
582 xprt_complete_bc_request(req, transport->recv.copied);
583 else
584 req->rq_private_buf.len = transport->recv.copied;
585
586 return ret;
587}
588#else /* CONFIG_SUNRPC_BACKCHANNEL */
589static ssize_t
590xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
591{
592 return -ESHUTDOWN;
593}
594#endif /* CONFIG_SUNRPC_BACKCHANNEL */
595
596static ssize_t
597xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
598{
599 struct rpc_xprt *xprt = &transport->xprt;
600 struct rpc_rqst *req;
601 ssize_t ret = 0;
602
603 /* Look up and lock the request corresponding to the given XID */
604 spin_lock(&xprt->queue_lock);
605 req = xprt_lookup_rqst(xprt, transport->recv.xid);
606 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
607 msg->msg_flags |= MSG_TRUNC;
608 goto out;
609 }
610 xprt_pin_rqst(req);
611 spin_unlock(&xprt->queue_lock);
612
613 ret = xs_read_stream_request(transport, msg, flags, req);
614
615 spin_lock(&xprt->queue_lock);
616 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
617 xprt_complete_rqst(req->rq_task, transport->recv.copied);
618 else
619 req->rq_private_buf.len = transport->recv.copied;
620 xprt_unpin_rqst(req);
621out:
622 spin_unlock(&xprt->queue_lock);
623 return ret;
624}
625
626static ssize_t
627xs_read_stream(struct sock_xprt *transport, int flags)
628{
629 struct msghdr msg = { 0 };
630 size_t want, read = 0;
631 ssize_t ret = 0;
632
633 if (transport->recv.len == 0) {
634 want = xs_read_stream_headersize(transport->recv.copied != 0);
635 ret = xs_read_stream_header(transport, &msg, flags, want,
636 transport->recv.offset);
637 if (ret <= 0)
638 goto out_err;
639 transport->recv.offset = ret;
640 if (transport->recv.offset != want)
641 return transport->recv.offset;
642 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
643 RPC_FRAGMENT_SIZE_MASK;
644 transport->recv.offset -= sizeof(transport->recv.fraghdr);
645 read = ret;
646 }
647
648 switch (be32_to_cpu(transport->recv.calldir)) {
649 default:
650 msg.msg_flags |= MSG_TRUNC;
651 break;
652 case RPC_CALL:
653 ret = xs_read_stream_call(transport, &msg, flags);
654 break;
655 case RPC_REPLY:
656 ret = xs_read_stream_reply(transport, &msg, flags);
657 }
658 if (msg.msg_flags & MSG_TRUNC) {
659 transport->recv.calldir = cpu_to_be32(-1);
660 transport->recv.copied = -1;
661 }
662 if (ret < 0)
663 goto out_err;
664 read += ret;
665 if (transport->recv.offset < transport->recv.len) {
666 if (!(msg.msg_flags & MSG_TRUNC))
667 return read;
668 msg.msg_flags = 0;
669 ret = xs_read_discard(transport->sock, &msg, flags,
670 transport->recv.len - transport->recv.offset);
671 if (ret <= 0)
672 goto out_err;
673 transport->recv.offset += ret;
674 read += ret;
675 if (transport->recv.offset != transport->recv.len)
676 return read;
677 }
678 if (xs_read_stream_request_done(transport)) {
679 trace_xs_stream_read_request(transport);
680 transport->recv.copied = 0;
681 }
682 transport->recv.offset = 0;
683 transport->recv.len = 0;
684 return read;
685out_err:
686 return ret != 0 ? ret : -ESHUTDOWN;
687}
688
689static __poll_t xs_poll_socket(struct sock_xprt *transport)
690{
691 return transport->sock->ops->poll(transport->file, transport->sock,
692 NULL);
693}
694
695static bool xs_poll_socket_readable(struct sock_xprt *transport)
696{
697 __poll_t events = xs_poll_socket(transport);
698
699 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
700}
701
702static void xs_poll_check_readable(struct sock_xprt *transport)
703{
704
705 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
706 if (!xs_poll_socket_readable(transport))
707 return;
708 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
709 queue_work(xprtiod_workqueue, &transport->recv_worker);
710}
711
712static void xs_stream_data_receive(struct sock_xprt *transport)
713{
714 size_t read = 0;
715 ssize_t ret = 0;
716
717 mutex_lock(&transport->recv_mutex);
718 if (transport->sock == NULL)
719 goto out;
720 for (;;) {
721 ret = xs_read_stream(transport, MSG_DONTWAIT);
722 if (ret < 0)
723 break;
724 read += ret;
725 cond_resched();
726 }
727 if (ret == -ESHUTDOWN)
728 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
729 else
730 xs_poll_check_readable(transport);
731out:
732 mutex_unlock(&transport->recv_mutex);
733 trace_xs_stream_read_data(&transport->xprt, ret, read);
734}
735
736static void xs_stream_data_receive_workfn(struct work_struct *work)
737{
738 struct sock_xprt *transport =
739 container_of(work, struct sock_xprt, recv_worker);
740 unsigned int pflags = memalloc_nofs_save();
741
742 xs_stream_data_receive(transport);
743 memalloc_nofs_restore(pflags);
744}
745
746static void
747xs_stream_reset_connect(struct sock_xprt *transport)
748{
749 transport->recv.offset = 0;
750 transport->recv.len = 0;
751 transport->recv.copied = 0;
752 transport->xmit.offset = 0;
753}
754
755static void
756xs_stream_start_connect(struct sock_xprt *transport)
757{
758 transport->xprt.stat.connect_count++;
759 transport->xprt.stat.connect_start = jiffies;
760}
761
762#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
763
764/**
765 * xs_nospace - handle transmit was incomplete
766 * @req: pointer to RPC request
767 * @transport: pointer to struct sock_xprt
768 *
769 */
770static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
771{
772 struct rpc_xprt *xprt = &transport->xprt;
773 struct sock *sk = transport->inet;
774 int ret = -EAGAIN;
775
776 trace_rpc_socket_nospace(req, transport);
777
778 /* Protect against races with write_space */
779 spin_lock(&xprt->transport_lock);
780
781 /* Don't race with disconnect */
782 if (xprt_connected(xprt)) {
783 /* wait for more buffer space */
784 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
785 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
786 sk->sk_write_pending++;
787 xprt_wait_for_buffer_space(xprt);
788 } else
789 ret = -ENOTCONN;
790
791 spin_unlock(&xprt->transport_lock);
792 return ret;
793}
794
795static int xs_sock_nospace(struct rpc_rqst *req)
796{
797 struct sock_xprt *transport =
798 container_of(req->rq_xprt, struct sock_xprt, xprt);
799 struct sock *sk = transport->inet;
800 int ret = -EAGAIN;
801
802 lock_sock(sk);
803 if (!sock_writeable(sk))
804 ret = xs_nospace(req, transport);
805 release_sock(sk);
806 return ret;
807}
808
809static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
810{
811 struct sock_xprt *transport =
812 container_of(req->rq_xprt, struct sock_xprt, xprt);
813 struct sock *sk = transport->inet;
814 int ret = -EAGAIN;
815
816 if (vm_wait)
817 return -ENOBUFS;
818 lock_sock(sk);
819 if (!sk_stream_memory_free(sk))
820 ret = xs_nospace(req, transport);
821 release_sock(sk);
822 return ret;
823}
824
825static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
826{
827 return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
828}
829
830/*
831 * Determine if the previous message in the stream was aborted before it
832 * could complete transmission.
833 */
834static bool
835xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
836{
837 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
838}
839
840/*
841 * Return the stream record marker field for a record of length < 2^31-1
842 */
843static rpc_fraghdr
844xs_stream_record_marker(struct xdr_buf *xdr)
845{
846 if (!xdr->len)
847 return 0;
848 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
849}
850
851/**
852 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
853 * @req: pointer to RPC request
854 *
855 * Return values:
856 * 0: The request has been sent
857 * EAGAIN: The socket was blocked, please call again later to
858 * complete the request
859 * ENOTCONN: Caller needs to invoke connect logic then call again
860 * other: Some other error occurred, the request was not sent
861 */
862static int xs_local_send_request(struct rpc_rqst *req)
863{
864 struct rpc_xprt *xprt = req->rq_xprt;
865 struct sock_xprt *transport =
866 container_of(xprt, struct sock_xprt, xprt);
867 struct xdr_buf *xdr = &req->rq_snd_buf;
868 rpc_fraghdr rm = xs_stream_record_marker(xdr);
869 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
870 struct msghdr msg = {
871 .msg_flags = XS_SENDMSG_FLAGS,
872 };
873 bool vm_wait;
874 unsigned int sent;
875 int status;
876
877 /* Close the stream if the previous transmission was incomplete */
878 if (xs_send_request_was_aborted(transport, req)) {
879 xprt_force_disconnect(xprt);
880 return -ENOTCONN;
881 }
882
883 xs_pktdump("packet data:",
884 req->rq_svec->iov_base, req->rq_svec->iov_len);
885
886 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
887
888 req->rq_xtime = ktime_get();
889 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
890 transport->xmit.offset, rm, &sent);
891 dprintk("RPC: %s(%u) = %d\n",
892 __func__, xdr->len - transport->xmit.offset, status);
893
894 if (likely(sent > 0) || status == 0) {
895 transport->xmit.offset += sent;
896 req->rq_bytes_sent = transport->xmit.offset;
897 if (likely(req->rq_bytes_sent >= msglen)) {
898 req->rq_xmit_bytes_sent += transport->xmit.offset;
899 transport->xmit.offset = 0;
900 return 0;
901 }
902 status = -EAGAIN;
903 vm_wait = false;
904 }
905
906 switch (status) {
907 case -EAGAIN:
908 status = xs_stream_nospace(req, vm_wait);
909 break;
910 default:
911 dprintk("RPC: sendmsg returned unrecognized error %d\n",
912 -status);
913 fallthrough;
914 case -EPIPE:
915 xprt_force_disconnect(xprt);
916 status = -ENOTCONN;
917 }
918
919 return status;
920}
921
922/**
923 * xs_udp_send_request - write an RPC request to a UDP socket
924 * @req: pointer to RPC request
925 *
926 * Return values:
927 * 0: The request has been sent
928 * EAGAIN: The socket was blocked, please call again later to
929 * complete the request
930 * ENOTCONN: Caller needs to invoke connect logic then call again
931 * other: Some other error occurred, the request was not sent
932 */
933static int xs_udp_send_request(struct rpc_rqst *req)
934{
935 struct rpc_xprt *xprt = req->rq_xprt;
936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
937 struct xdr_buf *xdr = &req->rq_snd_buf;
938 struct msghdr msg = {
939 .msg_name = xs_addr(xprt),
940 .msg_namelen = xprt->addrlen,
941 .msg_flags = XS_SENDMSG_FLAGS,
942 };
943 unsigned int sent;
944 int status;
945
946 xs_pktdump("packet data:",
947 req->rq_svec->iov_base,
948 req->rq_svec->iov_len);
949
950 if (!xprt_bound(xprt))
951 return -ENOTCONN;
952
953 if (!xprt_request_get_cong(xprt, req))
954 return -EBADSLT;
955
956 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
957 if (status < 0)
958 return status;
959 req->rq_xtime = ktime_get();
960 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
961
962 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
963 xdr->len, status);
964
965 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
966 if (status == -EPERM)
967 goto process_status;
968
969 if (status == -EAGAIN && sock_writeable(transport->inet))
970 status = -ENOBUFS;
971
972 if (sent > 0 || status == 0) {
973 req->rq_xmit_bytes_sent += sent;
974 if (sent >= req->rq_slen)
975 return 0;
976 /* Still some bytes left; set up for a retry later. */
977 status = -EAGAIN;
978 }
979
980process_status:
981 switch (status) {
982 case -ENOTSOCK:
983 status = -ENOTCONN;
984 /* Should we call xs_close() here? */
985 break;
986 case -EAGAIN:
987 status = xs_sock_nospace(req);
988 break;
989 case -ENETUNREACH:
990 case -ENOBUFS:
991 case -EPIPE:
992 case -ECONNREFUSED:
993 case -EPERM:
994 /* When the server has died, an ICMP port unreachable message
995 * prompts ECONNREFUSED. */
996 break;
997 default:
998 dprintk("RPC: sendmsg returned unrecognized error %d\n",
999 -status);
1000 }
1001
1002 return status;
1003}
1004
1005/**
1006 * xs_tcp_send_request - write an RPC request to a TCP socket
1007 * @req: pointer to RPC request
1008 *
1009 * Return values:
1010 * 0: The request has been sent
1011 * EAGAIN: The socket was blocked, please call again later to
1012 * complete the request
1013 * ENOTCONN: Caller needs to invoke connect logic then call again
1014 * other: Some other error occurred, the request was not sent
1015 *
1016 * XXX: In the case of soft timeouts, should we eventually give up
1017 * if sendmsg is not able to make progress?
1018 */
1019static int xs_tcp_send_request(struct rpc_rqst *req)
1020{
1021 struct rpc_xprt *xprt = req->rq_xprt;
1022 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1023 struct xdr_buf *xdr = &req->rq_snd_buf;
1024 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1025 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1026 struct msghdr msg = {
1027 .msg_flags = XS_SENDMSG_FLAGS,
1028 };
1029 bool vm_wait;
1030 unsigned int sent;
1031 int status;
1032
1033 /* Close the stream if the previous transmission was incomplete */
1034 if (xs_send_request_was_aborted(transport, req)) {
1035 if (transport->sock != NULL)
1036 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1037 return -ENOTCONN;
1038 }
1039 if (!transport->inet)
1040 return -ENOTCONN;
1041
1042 xs_pktdump("packet data:",
1043 req->rq_svec->iov_base,
1044 req->rq_svec->iov_len);
1045
1046 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1047 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1048
1049 xs_set_srcport(transport, transport->sock);
1050
1051 /* Continue transmitting the packet/record. We must be careful
1052 * to cope with writespace callbacks arriving _after_ we have
1053 * called sendmsg(). */
1054 req->rq_xtime = ktime_get();
1055 tcp_sock_set_cork(transport->inet, true);
1056
1057 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1058
1059 do {
1060 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1061 transport->xmit.offset, rm, &sent);
1062
1063 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1064 xdr->len - transport->xmit.offset, status);
1065
1066 /* If we've sent the entire packet, immediately
1067 * reset the count of bytes sent. */
1068 transport->xmit.offset += sent;
1069 req->rq_bytes_sent = transport->xmit.offset;
1070 if (likely(req->rq_bytes_sent >= msglen)) {
1071 req->rq_xmit_bytes_sent += transport->xmit.offset;
1072 transport->xmit.offset = 0;
1073 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1074 tcp_sock_set_cork(transport->inet, false);
1075 return 0;
1076 }
1077
1078 WARN_ON_ONCE(sent == 0 && status == 0);
1079
1080 if (sent > 0)
1081 vm_wait = false;
1082
1083 } while (status == 0);
1084
1085 switch (status) {
1086 case -ENOTSOCK:
1087 status = -ENOTCONN;
1088 /* Should we call xs_close() here? */
1089 break;
1090 case -EAGAIN:
1091 status = xs_stream_nospace(req, vm_wait);
1092 break;
1093 case -ECONNRESET:
1094 case -ECONNREFUSED:
1095 case -ENOTCONN:
1096 case -EADDRINUSE:
1097 case -ENOBUFS:
1098 case -EPIPE:
1099 break;
1100 default:
1101 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1102 -status);
1103 }
1104
1105 return status;
1106}
1107
1108static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1109{
1110 transport->old_data_ready = sk->sk_data_ready;
1111 transport->old_state_change = sk->sk_state_change;
1112 transport->old_write_space = sk->sk_write_space;
1113 transport->old_error_report = sk->sk_error_report;
1114}
1115
1116static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1117{
1118 sk->sk_data_ready = transport->old_data_ready;
1119 sk->sk_state_change = transport->old_state_change;
1120 sk->sk_write_space = transport->old_write_space;
1121 sk->sk_error_report = transport->old_error_report;
1122}
1123
1124static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1125{
1126 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1127
1128 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1129 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1130 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1131 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1132 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1133}
1134
1135static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1136{
1137 set_bit(nr, &transport->sock_state);
1138 queue_work(xprtiod_workqueue, &transport->error_worker);
1139}
1140
1141static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1142{
1143 xprt->connect_cookie++;
1144 smp_mb__before_atomic();
1145 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1146 clear_bit(XPRT_CLOSING, &xprt->state);
1147 xs_sock_reset_state_flags(xprt);
1148 smp_mb__after_atomic();
1149}
1150
1151/**
1152 * xs_error_report - callback to handle TCP socket state errors
1153 * @sk: socket
1154 *
1155 * Note: we don't call sock_error() since there may be a rpc_task
1156 * using the socket, and so we don't want to clear sk->sk_err.
1157 */
1158static void xs_error_report(struct sock *sk)
1159{
1160 struct sock_xprt *transport;
1161 struct rpc_xprt *xprt;
1162
1163 if (!(xprt = xprt_from_sock(sk)))
1164 return;
1165
1166 transport = container_of(xprt, struct sock_xprt, xprt);
1167 transport->xprt_err = -sk->sk_err;
1168 if (transport->xprt_err == 0)
1169 return;
1170 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1171 xprt, -transport->xprt_err);
1172 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1173
1174 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1175 smp_mb__before_atomic();
1176 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1177}
1178
1179static void xs_reset_transport(struct sock_xprt *transport)
1180{
1181 struct socket *sock = transport->sock;
1182 struct sock *sk = transport->inet;
1183 struct rpc_xprt *xprt = &transport->xprt;
1184 struct file *filp = transport->file;
1185
1186 if (sk == NULL)
1187 return;
1188 /*
1189 * Make sure we're calling this in a context from which it is safe
1190 * to call __fput_sync(). In practice that means rpciod and the
1191 * system workqueue.
1192 */
1193 if (!(current->flags & PF_WQ_WORKER)) {
1194 WARN_ON_ONCE(1);
1195 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1196 return;
1197 }
1198
1199 if (atomic_read(&transport->xprt.swapper))
1200 sk_clear_memalloc(sk);
1201
1202 kernel_sock_shutdown(sock, SHUT_RDWR);
1203
1204 mutex_lock(&transport->recv_mutex);
1205 lock_sock(sk);
1206 transport->inet = NULL;
1207 transport->sock = NULL;
1208 transport->file = NULL;
1209
1210 sk->sk_user_data = NULL;
1211
1212 xs_restore_old_callbacks(transport, sk);
1213 xprt_clear_connected(xprt);
1214 xs_sock_reset_connection_flags(xprt);
1215 /* Reset stream record info */
1216 xs_stream_reset_connect(transport);
1217 release_sock(sk);
1218 mutex_unlock(&transport->recv_mutex);
1219
1220 trace_rpc_socket_close(xprt, sock);
1221 __fput_sync(filp);
1222
1223 xprt_disconnect_done(xprt);
1224}
1225
1226/**
1227 * xs_close - close a socket
1228 * @xprt: transport
1229 *
1230 * This is used when all requests are complete; ie, no DRC state remains
1231 * on the server we want to save.
1232 *
1233 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1234 * xs_reset_transport() zeroing the socket from underneath a writer.
1235 */
1236static void xs_close(struct rpc_xprt *xprt)
1237{
1238 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1239
1240 dprintk("RPC: xs_close xprt %p\n", xprt);
1241
1242 xs_reset_transport(transport);
1243 xprt->reestablish_timeout = 0;
1244}
1245
1246static void xs_inject_disconnect(struct rpc_xprt *xprt)
1247{
1248 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1249 xprt);
1250 xprt_disconnect_done(xprt);
1251}
1252
1253static void xs_xprt_free(struct rpc_xprt *xprt)
1254{
1255 xs_free_peer_addresses(xprt);
1256 xprt_free(xprt);
1257}
1258
1259/**
1260 * xs_destroy - prepare to shutdown a transport
1261 * @xprt: doomed transport
1262 *
1263 */
1264static void xs_destroy(struct rpc_xprt *xprt)
1265{
1266 struct sock_xprt *transport = container_of(xprt,
1267 struct sock_xprt, xprt);
1268 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1269
1270 cancel_delayed_work_sync(&transport->connect_worker);
1271 xs_close(xprt);
1272 cancel_work_sync(&transport->recv_worker);
1273 cancel_work_sync(&transport->error_worker);
1274 xs_xprt_free(xprt);
1275 module_put(THIS_MODULE);
1276}
1277
1278/**
1279 * xs_udp_data_read_skb - receive callback for UDP sockets
1280 * @xprt: transport
1281 * @sk: socket
1282 * @skb: skbuff
1283 *
1284 */
1285static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1286 struct sock *sk,
1287 struct sk_buff *skb)
1288{
1289 struct rpc_task *task;
1290 struct rpc_rqst *rovr;
1291 int repsize, copied;
1292 u32 _xid;
1293 __be32 *xp;
1294
1295 repsize = skb->len;
1296 if (repsize < 4) {
1297 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1298 return;
1299 }
1300
1301 /* Copy the XID from the skb... */
1302 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1303 if (xp == NULL)
1304 return;
1305
1306 /* Look up and lock the request corresponding to the given XID */
1307 spin_lock(&xprt->queue_lock);
1308 rovr = xprt_lookup_rqst(xprt, *xp);
1309 if (!rovr)
1310 goto out_unlock;
1311 xprt_pin_rqst(rovr);
1312 xprt_update_rtt(rovr->rq_task);
1313 spin_unlock(&xprt->queue_lock);
1314 task = rovr->rq_task;
1315
1316 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1317 copied = repsize;
1318
1319 /* Suck it into the iovec, verify checksum if not done by hw. */
1320 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1321 spin_lock(&xprt->queue_lock);
1322 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1323 goto out_unpin;
1324 }
1325
1326
1327 spin_lock(&xprt->transport_lock);
1328 xprt_adjust_cwnd(xprt, task, copied);
1329 spin_unlock(&xprt->transport_lock);
1330 spin_lock(&xprt->queue_lock);
1331 xprt_complete_rqst(task, copied);
1332 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1333out_unpin:
1334 xprt_unpin_rqst(rovr);
1335 out_unlock:
1336 spin_unlock(&xprt->queue_lock);
1337}
1338
1339static void xs_udp_data_receive(struct sock_xprt *transport)
1340{
1341 struct sk_buff *skb;
1342 struct sock *sk;
1343 int err;
1344
1345 mutex_lock(&transport->recv_mutex);
1346 sk = transport->inet;
1347 if (sk == NULL)
1348 goto out;
1349 for (;;) {
1350 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1351 if (skb == NULL)
1352 break;
1353 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1354 consume_skb(skb);
1355 cond_resched();
1356 }
1357 xs_poll_check_readable(transport);
1358out:
1359 mutex_unlock(&transport->recv_mutex);
1360}
1361
1362static void xs_udp_data_receive_workfn(struct work_struct *work)
1363{
1364 struct sock_xprt *transport =
1365 container_of(work, struct sock_xprt, recv_worker);
1366 unsigned int pflags = memalloc_nofs_save();
1367
1368 xs_udp_data_receive(transport);
1369 memalloc_nofs_restore(pflags);
1370}
1371
1372/**
1373 * xs_data_ready - "data ready" callback for sockets
1374 * @sk: socket with data to read
1375 *
1376 */
1377static void xs_data_ready(struct sock *sk)
1378{
1379 struct rpc_xprt *xprt;
1380
1381 xprt = xprt_from_sock(sk);
1382 if (xprt != NULL) {
1383 struct sock_xprt *transport = container_of(xprt,
1384 struct sock_xprt, xprt);
1385
1386 trace_xs_data_ready(xprt);
1387
1388 transport->old_data_ready(sk);
1389 /* Any data means we had a useful conversation, so
1390 * then we don't need to delay the next reconnect
1391 */
1392 if (xprt->reestablish_timeout)
1393 xprt->reestablish_timeout = 0;
1394 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1395 queue_work(xprtiod_workqueue, &transport->recv_worker);
1396 }
1397}
1398
1399/*
1400 * Helper function to force a TCP close if the server is sending
1401 * junk and/or it has put us in CLOSE_WAIT
1402 */
1403static void xs_tcp_force_close(struct rpc_xprt *xprt)
1404{
1405 xprt_force_disconnect(xprt);
1406}
1407
1408#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1409static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1410{
1411 return PAGE_SIZE;
1412}
1413#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1414
1415/**
1416 * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1417 * @sk: socket whose state has changed
1418 *
1419 */
1420static void xs_local_state_change(struct sock *sk)
1421{
1422 struct rpc_xprt *xprt;
1423 struct sock_xprt *transport;
1424
1425 if (!(xprt = xprt_from_sock(sk)))
1426 return;
1427 transport = container_of(xprt, struct sock_xprt, xprt);
1428 if (sk->sk_shutdown & SHUTDOWN_MASK) {
1429 clear_bit(XPRT_CONNECTED, &xprt->state);
1430 /* Trigger the socket release */
1431 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1432 }
1433}
1434
1435/**
1436 * xs_tcp_state_change - callback to handle TCP socket state changes
1437 * @sk: socket whose state has changed
1438 *
1439 */
1440static void xs_tcp_state_change(struct sock *sk)
1441{
1442 struct rpc_xprt *xprt;
1443 struct sock_xprt *transport;
1444
1445 if (!(xprt = xprt_from_sock(sk)))
1446 return;
1447 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1448 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1449 sk->sk_state, xprt_connected(xprt),
1450 sock_flag(sk, SOCK_DEAD),
1451 sock_flag(sk, SOCK_ZAPPED),
1452 sk->sk_shutdown);
1453
1454 transport = container_of(xprt, struct sock_xprt, xprt);
1455 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1456 switch (sk->sk_state) {
1457 case TCP_ESTABLISHED:
1458 if (!xprt_test_and_set_connected(xprt)) {
1459 xprt->connect_cookie++;
1460 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1461 xprt_clear_connecting(xprt);
1462
1463 xprt->stat.connect_count++;
1464 xprt->stat.connect_time += (long)jiffies -
1465 xprt->stat.connect_start;
1466 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1467 }
1468 break;
1469 case TCP_FIN_WAIT1:
1470 /* The client initiated a shutdown of the socket */
1471 xprt->connect_cookie++;
1472 xprt->reestablish_timeout = 0;
1473 set_bit(XPRT_CLOSING, &xprt->state);
1474 smp_mb__before_atomic();
1475 clear_bit(XPRT_CONNECTED, &xprt->state);
1476 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1477 smp_mb__after_atomic();
1478 break;
1479 case TCP_CLOSE_WAIT:
1480 /* The server initiated a shutdown of the socket */
1481 xprt->connect_cookie++;
1482 clear_bit(XPRT_CONNECTED, &xprt->state);
1483 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1484 fallthrough;
1485 case TCP_CLOSING:
1486 /*
1487 * If the server closed down the connection, make sure that
1488 * we back off before reconnecting
1489 */
1490 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1491 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1492 break;
1493 case TCP_LAST_ACK:
1494 set_bit(XPRT_CLOSING, &xprt->state);
1495 smp_mb__before_atomic();
1496 clear_bit(XPRT_CONNECTED, &xprt->state);
1497 smp_mb__after_atomic();
1498 break;
1499 case TCP_CLOSE:
1500 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1501 &transport->sock_state))
1502 xprt_clear_connecting(xprt);
1503 clear_bit(XPRT_CLOSING, &xprt->state);
1504 /* Trigger the socket release */
1505 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1506 }
1507}
1508
1509static void xs_write_space(struct sock *sk)
1510{
1511 struct sock_xprt *transport;
1512 struct rpc_xprt *xprt;
1513
1514 if (!sk->sk_socket)
1515 return;
1516 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1517
1518 if (unlikely(!(xprt = xprt_from_sock(sk))))
1519 return;
1520 transport = container_of(xprt, struct sock_xprt, xprt);
1521 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1522 return;
1523 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1524 sk->sk_write_pending--;
1525}
1526
1527/**
1528 * xs_udp_write_space - callback invoked when socket buffer space
1529 * becomes available
1530 * @sk: socket whose state has changed
1531 *
1532 * Called when more output buffer space is available for this socket.
1533 * We try not to wake our writers until they can make "significant"
1534 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1535 * with a bunch of small requests.
1536 */
1537static void xs_udp_write_space(struct sock *sk)
1538{
1539 /* from net/core/sock.c:sock_def_write_space */
1540 if (sock_writeable(sk))
1541 xs_write_space(sk);
1542}
1543
1544/**
1545 * xs_tcp_write_space - callback invoked when socket buffer space
1546 * becomes available
1547 * @sk: socket whose state has changed
1548 *
1549 * Called when more output buffer space is available for this socket.
1550 * We try not to wake our writers until they can make "significant"
1551 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1552 * with a bunch of small requests.
1553 */
1554static void xs_tcp_write_space(struct sock *sk)
1555{
1556 /* from net/core/stream.c:sk_stream_write_space */
1557 if (sk_stream_is_writeable(sk))
1558 xs_write_space(sk);
1559}
1560
1561static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1562{
1563 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1564 struct sock *sk = transport->inet;
1565
1566 if (transport->rcvsize) {
1567 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1568 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1569 }
1570 if (transport->sndsize) {
1571 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1572 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1573 sk->sk_write_space(sk);
1574 }
1575}
1576
1577/**
1578 * xs_udp_set_buffer_size - set send and receive limits
1579 * @xprt: generic transport
1580 * @sndsize: requested size of send buffer, in bytes
1581 * @rcvsize: requested size of receive buffer, in bytes
1582 *
1583 * Set socket send and receive buffer size limits.
1584 */
1585static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1586{
1587 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1588
1589 transport->sndsize = 0;
1590 if (sndsize)
1591 transport->sndsize = sndsize + 1024;
1592 transport->rcvsize = 0;
1593 if (rcvsize)
1594 transport->rcvsize = rcvsize + 1024;
1595
1596 xs_udp_do_set_buffer_size(xprt);
1597}
1598
1599/**
1600 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1601 * @xprt: controlling transport
1602 * @task: task that timed out
1603 *
1604 * Adjust the congestion window after a retransmit timeout has occurred.
1605 */
1606static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1607{
1608 spin_lock(&xprt->transport_lock);
1609 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1610 spin_unlock(&xprt->transport_lock);
1611}
1612
1613static int xs_get_random_port(void)
1614{
1615 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1616 unsigned short range;
1617 unsigned short rand;
1618
1619 if (max < min)
1620 return -EADDRINUSE;
1621 range = max - min + 1;
1622 rand = get_random_u32_below(range);
1623 return rand + min;
1624}
1625
1626static unsigned short xs_sock_getport(struct socket *sock)
1627{
1628 struct sockaddr_storage buf;
1629 unsigned short port = 0;
1630
1631 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1632 goto out;
1633 switch (buf.ss_family) {
1634 case AF_INET6:
1635 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1636 break;
1637 case AF_INET:
1638 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1639 }
1640out:
1641 return port;
1642}
1643
1644/**
1645 * xs_set_port - reset the port number in the remote endpoint address
1646 * @xprt: generic transport
1647 * @port: new port number
1648 *
1649 */
1650static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1651{
1652 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1653
1654 rpc_set_port(xs_addr(xprt), port);
1655 xs_update_peer_port(xprt);
1656}
1657
1658static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1659{
1660 if (transport->srcport == 0 && transport->xprt.reuseport)
1661 transport->srcport = xs_sock_getport(sock);
1662}
1663
1664static int xs_get_srcport(struct sock_xprt *transport)
1665{
1666 int port = transport->srcport;
1667
1668 if (port == 0 && transport->xprt.resvport)
1669 port = xs_get_random_port();
1670 return port;
1671}
1672
1673static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1674{
1675 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1676 unsigned short ret = 0;
1677 mutex_lock(&sock->recv_mutex);
1678 if (sock->sock)
1679 ret = xs_sock_getport(sock->sock);
1680 mutex_unlock(&sock->recv_mutex);
1681 return ret;
1682}
1683
1684static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1685{
1686 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1687 union {
1688 struct sockaddr sa;
1689 struct sockaddr_storage st;
1690 } saddr;
1691 int ret = -ENOTCONN;
1692
1693 mutex_lock(&sock->recv_mutex);
1694 if (sock->sock) {
1695 ret = kernel_getsockname(sock->sock, &saddr.sa);
1696 if (ret >= 0)
1697 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1698 }
1699 mutex_unlock(&sock->recv_mutex);
1700 return ret;
1701}
1702
1703static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1704{
1705 if (transport->srcport != 0)
1706 transport->srcport = 0;
1707 if (!transport->xprt.resvport)
1708 return 0;
1709 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1710 return xprt_max_resvport;
1711 return --port;
1712}
1713static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1714{
1715 struct sockaddr_storage myaddr;
1716 int err, nloop = 0;
1717 int port = xs_get_srcport(transport);
1718 unsigned short last;
1719
1720 /*
1721 * If we are asking for any ephemeral port (i.e. port == 0 &&
1722 * transport->xprt.resvport == 0), don't bind. Let the local
1723 * port selection happen implicitly when the socket is used
1724 * (for example at connect time).
1725 *
1726 * This ensures that we can continue to establish TCP
1727 * connections even when all local ephemeral ports are already
1728 * a part of some TCP connection. This makes no difference
1729 * for UDP sockets, but also doesn't harm them.
1730 *
1731 * If we're asking for any reserved port (i.e. port == 0 &&
1732 * transport->xprt.resvport == 1) xs_get_srcport above will
1733 * ensure that port is non-zero and we will bind as needed.
1734 */
1735 if (port <= 0)
1736 return port;
1737
1738 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1739 do {
1740 rpc_set_port((struct sockaddr *)&myaddr, port);
1741 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1742 transport->xprt.addrlen);
1743 if (err == 0) {
1744 if (transport->xprt.reuseport)
1745 transport->srcport = port;
1746 break;
1747 }
1748 last = port;
1749 port = xs_next_srcport(transport, port);
1750 if (port > last)
1751 nloop++;
1752 } while (err == -EADDRINUSE && nloop != 2);
1753
1754 if (myaddr.ss_family == AF_INET)
1755 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1756 &((struct sockaddr_in *)&myaddr)->sin_addr,
1757 port, err ? "failed" : "ok", err);
1758 else
1759 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1760 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1761 port, err ? "failed" : "ok", err);
1762 return err;
1763}
1764
1765/*
1766 * We don't support autobind on AF_LOCAL sockets
1767 */
1768static void xs_local_rpcbind(struct rpc_task *task)
1769{
1770 xprt_set_bound(task->tk_xprt);
1771}
1772
1773static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1774{
1775}
1776
1777#ifdef CONFIG_DEBUG_LOCK_ALLOC
1778static struct lock_class_key xs_key[3];
1779static struct lock_class_key xs_slock_key[3];
1780
1781static inline void xs_reclassify_socketu(struct socket *sock)
1782{
1783 struct sock *sk = sock->sk;
1784
1785 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1786 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1787}
1788
1789static inline void xs_reclassify_socket4(struct socket *sock)
1790{
1791 struct sock *sk = sock->sk;
1792
1793 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1794 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1795}
1796
1797static inline void xs_reclassify_socket6(struct socket *sock)
1798{
1799 struct sock *sk = sock->sk;
1800
1801 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1802 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1803}
1804
1805static inline void xs_reclassify_socket(int family, struct socket *sock)
1806{
1807 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1808 return;
1809
1810 switch (family) {
1811 case AF_LOCAL:
1812 xs_reclassify_socketu(sock);
1813 break;
1814 case AF_INET:
1815 xs_reclassify_socket4(sock);
1816 break;
1817 case AF_INET6:
1818 xs_reclassify_socket6(sock);
1819 break;
1820 }
1821}
1822#else
1823static inline void xs_reclassify_socket(int family, struct socket *sock)
1824{
1825}
1826#endif
1827
1828static void xs_dummy_setup_socket(struct work_struct *work)
1829{
1830}
1831
1832static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1833 struct sock_xprt *transport, int family, int type,
1834 int protocol, bool reuseport)
1835{
1836 struct file *filp;
1837 struct socket *sock;
1838 int err;
1839
1840 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1841 if (err < 0) {
1842 dprintk("RPC: can't create %d transport socket (%d).\n",
1843 protocol, -err);
1844 goto out;
1845 }
1846 xs_reclassify_socket(family, sock);
1847
1848 if (reuseport)
1849 sock_set_reuseport(sock->sk);
1850
1851 err = xs_bind(transport, sock);
1852 if (err) {
1853 sock_release(sock);
1854 goto out;
1855 }
1856
1857 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1858 if (IS_ERR(filp))
1859 return ERR_CAST(filp);
1860 transport->file = filp;
1861
1862 return sock;
1863out:
1864 return ERR_PTR(err);
1865}
1866
1867static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1868 struct socket *sock)
1869{
1870 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1871 xprt);
1872
1873 if (!transport->inet) {
1874 struct sock *sk = sock->sk;
1875
1876 lock_sock(sk);
1877
1878 xs_save_old_callbacks(transport, sk);
1879
1880 sk->sk_user_data = xprt;
1881 sk->sk_data_ready = xs_data_ready;
1882 sk->sk_write_space = xs_udp_write_space;
1883 sk->sk_state_change = xs_local_state_change;
1884 sk->sk_error_report = xs_error_report;
1885 sk->sk_use_task_frag = false;
1886
1887 xprt_clear_connected(xprt);
1888
1889 /* Reset to new socket */
1890 transport->sock = sock;
1891 transport->inet = sk;
1892
1893 release_sock(sk);
1894 }
1895
1896 xs_stream_start_connect(transport);
1897
1898 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1899}
1900
1901/**
1902 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1903 * @transport: socket transport to connect
1904 */
1905static int xs_local_setup_socket(struct sock_xprt *transport)
1906{
1907 struct rpc_xprt *xprt = &transport->xprt;
1908 struct file *filp;
1909 struct socket *sock;
1910 int status;
1911
1912 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1913 SOCK_STREAM, 0, &sock, 1);
1914 if (status < 0) {
1915 dprintk("RPC: can't create AF_LOCAL "
1916 "transport socket (%d).\n", -status);
1917 goto out;
1918 }
1919 xs_reclassify_socket(AF_LOCAL, sock);
1920
1921 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1922 if (IS_ERR(filp)) {
1923 status = PTR_ERR(filp);
1924 goto out;
1925 }
1926 transport->file = filp;
1927
1928 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1929 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1930
1931 status = xs_local_finish_connecting(xprt, sock);
1932 trace_rpc_socket_connect(xprt, sock, status);
1933 switch (status) {
1934 case 0:
1935 dprintk("RPC: xprt %p connected to %s\n",
1936 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1937 xprt->stat.connect_count++;
1938 xprt->stat.connect_time += (long)jiffies -
1939 xprt->stat.connect_start;
1940 xprt_set_connected(xprt);
1941 break;
1942 case -ENOBUFS:
1943 break;
1944 case -ENOENT:
1945 dprintk("RPC: xprt %p: socket %s does not exist\n",
1946 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1947 break;
1948 case -ECONNREFUSED:
1949 dprintk("RPC: xprt %p: connection refused for %s\n",
1950 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1951 break;
1952 default:
1953 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1954 __func__, -status,
1955 xprt->address_strings[RPC_DISPLAY_ADDR]);
1956 }
1957
1958out:
1959 xprt_clear_connecting(xprt);
1960 xprt_wake_pending_tasks(xprt, status);
1961 return status;
1962}
1963
1964static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1965{
1966 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1967 int ret;
1968
1969 if (transport->file)
1970 goto force_disconnect;
1971
1972 if (RPC_IS_ASYNC(task)) {
1973 /*
1974 * We want the AF_LOCAL connect to be resolved in the
1975 * filesystem namespace of the process making the rpc
1976 * call. Thus we connect synchronously.
1977 *
1978 * If we want to support asynchronous AF_LOCAL calls,
1979 * we'll need to figure out how to pass a namespace to
1980 * connect.
1981 */
1982 rpc_task_set_rpc_status(task, -ENOTCONN);
1983 goto out_wake;
1984 }
1985 ret = xs_local_setup_socket(transport);
1986 if (ret && !RPC_IS_SOFTCONN(task))
1987 msleep_interruptible(15000);
1988 return;
1989force_disconnect:
1990 xprt_force_disconnect(xprt);
1991out_wake:
1992 xprt_clear_connecting(xprt);
1993 xprt_wake_pending_tasks(xprt, -ENOTCONN);
1994}
1995
1996#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1997/*
1998 * Note that this should be called with XPRT_LOCKED held, or recv_mutex
1999 * held, or when we otherwise know that we have exclusive access to the
2000 * socket, to guard against races with xs_reset_transport.
2001 */
2002static void xs_set_memalloc(struct rpc_xprt *xprt)
2003{
2004 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2005 xprt);
2006
2007 /*
2008 * If there's no sock, then we have nothing to set. The
2009 * reconnecting process will get it for us.
2010 */
2011 if (!transport->inet)
2012 return;
2013 if (atomic_read(&xprt->swapper))
2014 sk_set_memalloc(transport->inet);
2015}
2016
2017/**
2018 * xs_enable_swap - Tag this transport as being used for swap.
2019 * @xprt: transport to tag
2020 *
2021 * Take a reference to this transport on behalf of the rpc_clnt, and
2022 * optionally mark it for swapping if it wasn't already.
2023 */
2024static int
2025xs_enable_swap(struct rpc_xprt *xprt)
2026{
2027 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2028
2029 mutex_lock(&xs->recv_mutex);
2030 if (atomic_inc_return(&xprt->swapper) == 1 &&
2031 xs->inet)
2032 sk_set_memalloc(xs->inet);
2033 mutex_unlock(&xs->recv_mutex);
2034 return 0;
2035}
2036
2037/**
2038 * xs_disable_swap - Untag this transport as being used for swap.
2039 * @xprt: transport to tag
2040 *
2041 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2042 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2043 */
2044static void
2045xs_disable_swap(struct rpc_xprt *xprt)
2046{
2047 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2048
2049 mutex_lock(&xs->recv_mutex);
2050 if (atomic_dec_and_test(&xprt->swapper) &&
2051 xs->inet)
2052 sk_clear_memalloc(xs->inet);
2053 mutex_unlock(&xs->recv_mutex);
2054}
2055#else
2056static void xs_set_memalloc(struct rpc_xprt *xprt)
2057{
2058}
2059
2060static int
2061xs_enable_swap(struct rpc_xprt *xprt)
2062{
2063 return -EINVAL;
2064}
2065
2066static void
2067xs_disable_swap(struct rpc_xprt *xprt)
2068{
2069}
2070#endif
2071
2072static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2073{
2074 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2075
2076 if (!transport->inet) {
2077 struct sock *sk = sock->sk;
2078
2079 lock_sock(sk);
2080
2081 xs_save_old_callbacks(transport, sk);
2082
2083 sk->sk_user_data = xprt;
2084 sk->sk_data_ready = xs_data_ready;
2085 sk->sk_write_space = xs_udp_write_space;
2086 sk->sk_use_task_frag = false;
2087
2088 xprt_set_connected(xprt);
2089
2090 /* Reset to new socket */
2091 transport->sock = sock;
2092 transport->inet = sk;
2093
2094 xs_set_memalloc(xprt);
2095
2096 release_sock(sk);
2097 }
2098 xs_udp_do_set_buffer_size(xprt);
2099
2100 xprt->stat.connect_start = jiffies;
2101}
2102
2103static void xs_udp_setup_socket(struct work_struct *work)
2104{
2105 struct sock_xprt *transport =
2106 container_of(work, struct sock_xprt, connect_worker.work);
2107 struct rpc_xprt *xprt = &transport->xprt;
2108 struct socket *sock;
2109 int status = -EIO;
2110 unsigned int pflags = current->flags;
2111
2112 if (atomic_read(&xprt->swapper))
2113 current->flags |= PF_MEMALLOC;
2114 sock = xs_create_sock(xprt, transport,
2115 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2116 IPPROTO_UDP, false);
2117 if (IS_ERR(sock))
2118 goto out;
2119
2120 dprintk("RPC: worker connecting xprt %p via %s to "
2121 "%s (port %s)\n", xprt,
2122 xprt->address_strings[RPC_DISPLAY_PROTO],
2123 xprt->address_strings[RPC_DISPLAY_ADDR],
2124 xprt->address_strings[RPC_DISPLAY_PORT]);
2125
2126 xs_udp_finish_connecting(xprt, sock);
2127 trace_rpc_socket_connect(xprt, sock, 0);
2128 status = 0;
2129out:
2130 xprt_clear_connecting(xprt);
2131 xprt_unlock_connect(xprt, transport);
2132 xprt_wake_pending_tasks(xprt, status);
2133 current_restore_flags(pflags, PF_MEMALLOC);
2134}
2135
2136/**
2137 * xs_tcp_shutdown - gracefully shut down a TCP socket
2138 * @xprt: transport
2139 *
2140 * Initiates a graceful shutdown of the TCP socket by calling the
2141 * equivalent of shutdown(SHUT_RDWR);
2142 */
2143static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2144{
2145 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2146 struct socket *sock = transport->sock;
2147 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2148
2149 if (sock == NULL)
2150 return;
2151 if (!xprt->reuseport) {
2152 xs_close(xprt);
2153 return;
2154 }
2155 switch (skst) {
2156 case TCP_FIN_WAIT1:
2157 case TCP_FIN_WAIT2:
2158 break;
2159 case TCP_ESTABLISHED:
2160 case TCP_CLOSE_WAIT:
2161 kernel_sock_shutdown(sock, SHUT_RDWR);
2162 trace_rpc_socket_shutdown(xprt, sock);
2163 break;
2164 default:
2165 xs_reset_transport(transport);
2166 }
2167}
2168
2169static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2170 struct socket *sock)
2171{
2172 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2173 unsigned int keepidle;
2174 unsigned int keepcnt;
2175 unsigned int timeo;
2176
2177 spin_lock(&xprt->transport_lock);
2178 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2179 keepcnt = xprt->timeout->to_retries + 1;
2180 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2181 (xprt->timeout->to_retries + 1);
2182 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2183 spin_unlock(&xprt->transport_lock);
2184
2185 /* TCP Keepalive options */
2186 sock_set_keepalive(sock->sk);
2187 tcp_sock_set_keepidle(sock->sk, keepidle);
2188 tcp_sock_set_keepintvl(sock->sk, keepidle);
2189 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2190
2191 /* TCP user timeout (see RFC5482) */
2192 tcp_sock_set_user_timeout(sock->sk, timeo);
2193}
2194
2195static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2196 unsigned long connect_timeout,
2197 unsigned long reconnect_timeout)
2198{
2199 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2200 struct rpc_timeout to;
2201 unsigned long initval;
2202
2203 spin_lock(&xprt->transport_lock);
2204 if (reconnect_timeout < xprt->max_reconnect_timeout)
2205 xprt->max_reconnect_timeout = reconnect_timeout;
2206 if (connect_timeout < xprt->connect_timeout) {
2207 memcpy(&to, xprt->timeout, sizeof(to));
2208 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2209 /* Arbitrary lower limit */
2210 if (initval < XS_TCP_INIT_REEST_TO << 1)
2211 initval = XS_TCP_INIT_REEST_TO << 1;
2212 to.to_initval = initval;
2213 to.to_maxval = initval;
2214 memcpy(&transport->tcp_timeout, &to,
2215 sizeof(transport->tcp_timeout));
2216 xprt->timeout = &transport->tcp_timeout;
2217 xprt->connect_timeout = connect_timeout;
2218 }
2219 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2220 spin_unlock(&xprt->transport_lock);
2221}
2222
2223static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2224{
2225 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2226
2227 if (!transport->inet) {
2228 struct sock *sk = sock->sk;
2229
2230 /* Avoid temporary address, they are bad for long-lived
2231 * connections such as NFS mounts.
2232 * RFC4941, section 3.6 suggests that:
2233 * Individual applications, which have specific
2234 * knowledge about the normal duration of connections,
2235 * MAY override this as appropriate.
2236 */
2237 if (xs_addr(xprt)->sa_family == PF_INET6) {
2238 ip6_sock_set_addr_preferences(sk,
2239 IPV6_PREFER_SRC_PUBLIC);
2240 }
2241
2242 xs_tcp_set_socket_timeouts(xprt, sock);
2243 tcp_sock_set_nodelay(sk);
2244
2245 lock_sock(sk);
2246
2247 xs_save_old_callbacks(transport, sk);
2248
2249 sk->sk_user_data = xprt;
2250 sk->sk_data_ready = xs_data_ready;
2251 sk->sk_state_change = xs_tcp_state_change;
2252 sk->sk_write_space = xs_tcp_write_space;
2253 sk->sk_error_report = xs_error_report;
2254 sk->sk_use_task_frag = false;
2255
2256 /* socket options */
2257 sock_reset_flag(sk, SOCK_LINGER);
2258
2259 xprt_clear_connected(xprt);
2260
2261 /* Reset to new socket */
2262 transport->sock = sock;
2263 transport->inet = sk;
2264
2265 release_sock(sk);
2266 }
2267
2268 if (!xprt_bound(xprt))
2269 return -ENOTCONN;
2270
2271 xs_set_memalloc(xprt);
2272
2273 xs_stream_start_connect(transport);
2274
2275 /* Tell the socket layer to start connecting... */
2276 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2277 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2278}
2279
2280/**
2281 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2282 * @work: queued work item
2283 *
2284 * Invoked by a work queue tasklet.
2285 */
2286static void xs_tcp_setup_socket(struct work_struct *work)
2287{
2288 struct sock_xprt *transport =
2289 container_of(work, struct sock_xprt, connect_worker.work);
2290 struct socket *sock = transport->sock;
2291 struct rpc_xprt *xprt = &transport->xprt;
2292 int status;
2293 unsigned int pflags = current->flags;
2294
2295 if (atomic_read(&xprt->swapper))
2296 current->flags |= PF_MEMALLOC;
2297
2298 if (xprt_connected(xprt))
2299 goto out;
2300 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2301 &transport->sock_state) ||
2302 !sock) {
2303 xs_reset_transport(transport);
2304 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2305 SOCK_STREAM, IPPROTO_TCP, true);
2306 if (IS_ERR(sock)) {
2307 xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2308 goto out;
2309 }
2310 }
2311
2312 dprintk("RPC: worker connecting xprt %p via %s to "
2313 "%s (port %s)\n", xprt,
2314 xprt->address_strings[RPC_DISPLAY_PROTO],
2315 xprt->address_strings[RPC_DISPLAY_ADDR],
2316 xprt->address_strings[RPC_DISPLAY_PORT]);
2317
2318 status = xs_tcp_finish_connecting(xprt, sock);
2319 trace_rpc_socket_connect(xprt, sock, status);
2320 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2321 xprt, -status, xprt_connected(xprt),
2322 sock->sk->sk_state);
2323 switch (status) {
2324 case 0:
2325 case -EINPROGRESS:
2326 /* SYN_SENT! */
2327 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2328 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2329 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2330 fallthrough;
2331 case -EALREADY:
2332 goto out_unlock;
2333 case -EADDRNOTAVAIL:
2334 /* Source port number is unavailable. Try a new one! */
2335 transport->srcport = 0;
2336 status = -EAGAIN;
2337 break;
2338 case -EINVAL:
2339 /* Happens, for instance, if the user specified a link
2340 * local IPv6 address without a scope-id.
2341 */
2342 case -ECONNREFUSED:
2343 case -ECONNRESET:
2344 case -ENETDOWN:
2345 case -ENETUNREACH:
2346 case -EHOSTUNREACH:
2347 case -EADDRINUSE:
2348 case -ENOBUFS:
2349 break;
2350 default:
2351 printk("%s: connect returned unhandled error %d\n",
2352 __func__, status);
2353 status = -EAGAIN;
2354 }
2355
2356 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2357 * We need to wake them first to ensure the correct error code.
2358 */
2359 xprt_wake_pending_tasks(xprt, status);
2360 xs_tcp_force_close(xprt);
2361out:
2362 xprt_clear_connecting(xprt);
2363out_unlock:
2364 xprt_unlock_connect(xprt, transport);
2365 current_restore_flags(pflags, PF_MEMALLOC);
2366}
2367
2368/**
2369 * xs_connect - connect a socket to a remote endpoint
2370 * @xprt: pointer to transport structure
2371 * @task: address of RPC task that manages state of connect request
2372 *
2373 * TCP: If the remote end dropped the connection, delay reconnecting.
2374 *
2375 * UDP socket connects are synchronous, but we use a work queue anyway
2376 * to guarantee that even unprivileged user processes can set up a
2377 * socket on a privileged port.
2378 *
2379 * If a UDP socket connect fails, the delay behavior here prevents
2380 * retry floods (hard mounts).
2381 */
2382static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2383{
2384 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2385 unsigned long delay = 0;
2386
2387 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2388
2389 if (transport->sock != NULL) {
2390 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2391 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2392
2393 delay = xprt_reconnect_delay(xprt);
2394 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2395
2396 } else
2397 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2398
2399 queue_delayed_work(xprtiod_workqueue,
2400 &transport->connect_worker,
2401 delay);
2402}
2403
2404static void xs_wake_disconnect(struct sock_xprt *transport)
2405{
2406 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2407 xs_tcp_force_close(&transport->xprt);
2408}
2409
2410static void xs_wake_write(struct sock_xprt *transport)
2411{
2412 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2413 xprt_write_space(&transport->xprt);
2414}
2415
2416static void xs_wake_error(struct sock_xprt *transport)
2417{
2418 int sockerr;
2419
2420 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2421 return;
2422 mutex_lock(&transport->recv_mutex);
2423 if (transport->sock == NULL)
2424 goto out;
2425 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2426 goto out;
2427 sockerr = xchg(&transport->xprt_err, 0);
2428 if (sockerr < 0)
2429 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2430out:
2431 mutex_unlock(&transport->recv_mutex);
2432}
2433
2434static void xs_wake_pending(struct sock_xprt *transport)
2435{
2436 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2437 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2438}
2439
2440static void xs_error_handle(struct work_struct *work)
2441{
2442 struct sock_xprt *transport = container_of(work,
2443 struct sock_xprt, error_worker);
2444
2445 xs_wake_disconnect(transport);
2446 xs_wake_write(transport);
2447 xs_wake_error(transport);
2448 xs_wake_pending(transport);
2449}
2450
2451/**
2452 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2453 * @xprt: rpc_xprt struct containing statistics
2454 * @seq: output file
2455 *
2456 */
2457static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2458{
2459 long idle_time = 0;
2460
2461 if (xprt_connected(xprt))
2462 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2463
2464 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2465 "%llu %llu %lu %llu %llu\n",
2466 xprt->stat.bind_count,
2467 xprt->stat.connect_count,
2468 xprt->stat.connect_time / HZ,
2469 idle_time,
2470 xprt->stat.sends,
2471 xprt->stat.recvs,
2472 xprt->stat.bad_xids,
2473 xprt->stat.req_u,
2474 xprt->stat.bklog_u,
2475 xprt->stat.max_slots,
2476 xprt->stat.sending_u,
2477 xprt->stat.pending_u);
2478}
2479
2480/**
2481 * xs_udp_print_stats - display UDP socket-specific stats
2482 * @xprt: rpc_xprt struct containing statistics
2483 * @seq: output file
2484 *
2485 */
2486static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2487{
2488 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2489
2490 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2491 "%lu %llu %llu\n",
2492 transport->srcport,
2493 xprt->stat.bind_count,
2494 xprt->stat.sends,
2495 xprt->stat.recvs,
2496 xprt->stat.bad_xids,
2497 xprt->stat.req_u,
2498 xprt->stat.bklog_u,
2499 xprt->stat.max_slots,
2500 xprt->stat.sending_u,
2501 xprt->stat.pending_u);
2502}
2503
2504/**
2505 * xs_tcp_print_stats - display TCP socket-specific stats
2506 * @xprt: rpc_xprt struct containing statistics
2507 * @seq: output file
2508 *
2509 */
2510static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2511{
2512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2513 long idle_time = 0;
2514
2515 if (xprt_connected(xprt))
2516 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2517
2518 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2519 "%llu %llu %lu %llu %llu\n",
2520 transport->srcport,
2521 xprt->stat.bind_count,
2522 xprt->stat.connect_count,
2523 xprt->stat.connect_time / HZ,
2524 idle_time,
2525 xprt->stat.sends,
2526 xprt->stat.recvs,
2527 xprt->stat.bad_xids,
2528 xprt->stat.req_u,
2529 xprt->stat.bklog_u,
2530 xprt->stat.max_slots,
2531 xprt->stat.sending_u,
2532 xprt->stat.pending_u);
2533}
2534
2535/*
2536 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2537 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2538 * to use the server side send routines.
2539 */
2540static int bc_malloc(struct rpc_task *task)
2541{
2542 struct rpc_rqst *rqst = task->tk_rqstp;
2543 size_t size = rqst->rq_callsize;
2544 struct page *page;
2545 struct rpc_buffer *buf;
2546
2547 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2548 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2549 size);
2550 return -EINVAL;
2551 }
2552
2553 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2554 if (!page)
2555 return -ENOMEM;
2556
2557 buf = page_address(page);
2558 buf->len = PAGE_SIZE;
2559
2560 rqst->rq_buffer = buf->data;
2561 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2562 return 0;
2563}
2564
2565/*
2566 * Free the space allocated in the bc_alloc routine
2567 */
2568static void bc_free(struct rpc_task *task)
2569{
2570 void *buffer = task->tk_rqstp->rq_buffer;
2571 struct rpc_buffer *buf;
2572
2573 buf = container_of(buffer, struct rpc_buffer, data);
2574 free_page((unsigned long)buf);
2575}
2576
2577static int bc_sendto(struct rpc_rqst *req)
2578{
2579 struct xdr_buf *xdr = &req->rq_snd_buf;
2580 struct sock_xprt *transport =
2581 container_of(req->rq_xprt, struct sock_xprt, xprt);
2582 struct msghdr msg = {
2583 .msg_flags = 0,
2584 };
2585 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2586 (u32)xdr->len);
2587 unsigned int sent = 0;
2588 int err;
2589
2590 req->rq_xtime = ktime_get();
2591 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2592 if (err < 0)
2593 return err;
2594 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2595 xdr_free_bvec(xdr);
2596 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2597 return -EAGAIN;
2598 return sent;
2599}
2600
2601/**
2602 * bc_send_request - Send a backchannel Call on a TCP socket
2603 * @req: rpc_rqst containing Call message to be sent
2604 *
2605 * xpt_mutex ensures @rqstp's whole message is written to the socket
2606 * without interruption.
2607 *
2608 * Return values:
2609 * %0 if the message was sent successfully
2610 * %ENOTCONN if the message was not sent
2611 */
2612static int bc_send_request(struct rpc_rqst *req)
2613{
2614 struct svc_xprt *xprt;
2615 int len;
2616
2617 /*
2618 * Get the server socket associated with this callback xprt
2619 */
2620 xprt = req->rq_xprt->bc_xprt;
2621
2622 /*
2623 * Grab the mutex to serialize data as the connection is shared
2624 * with the fore channel
2625 */
2626 mutex_lock(&xprt->xpt_mutex);
2627 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2628 len = -ENOTCONN;
2629 else
2630 len = bc_sendto(req);
2631 mutex_unlock(&xprt->xpt_mutex);
2632
2633 if (len > 0)
2634 len = 0;
2635
2636 return len;
2637}
2638
2639/*
2640 * The close routine. Since this is client initiated, we do nothing
2641 */
2642
2643static void bc_close(struct rpc_xprt *xprt)
2644{
2645 xprt_disconnect_done(xprt);
2646}
2647
2648/*
2649 * The xprt destroy routine. Again, because this connection is client
2650 * initiated, we do nothing
2651 */
2652
2653static void bc_destroy(struct rpc_xprt *xprt)
2654{
2655 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2656
2657 xs_xprt_free(xprt);
2658 module_put(THIS_MODULE);
2659}
2660
2661static const struct rpc_xprt_ops xs_local_ops = {
2662 .reserve_xprt = xprt_reserve_xprt,
2663 .release_xprt = xprt_release_xprt,
2664 .alloc_slot = xprt_alloc_slot,
2665 .free_slot = xprt_free_slot,
2666 .rpcbind = xs_local_rpcbind,
2667 .set_port = xs_local_set_port,
2668 .connect = xs_local_connect,
2669 .buf_alloc = rpc_malloc,
2670 .buf_free = rpc_free,
2671 .prepare_request = xs_stream_prepare_request,
2672 .send_request = xs_local_send_request,
2673 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2674 .close = xs_close,
2675 .destroy = xs_destroy,
2676 .print_stats = xs_local_print_stats,
2677 .enable_swap = xs_enable_swap,
2678 .disable_swap = xs_disable_swap,
2679};
2680
2681static const struct rpc_xprt_ops xs_udp_ops = {
2682 .set_buffer_size = xs_udp_set_buffer_size,
2683 .reserve_xprt = xprt_reserve_xprt_cong,
2684 .release_xprt = xprt_release_xprt_cong,
2685 .alloc_slot = xprt_alloc_slot,
2686 .free_slot = xprt_free_slot,
2687 .rpcbind = rpcb_getport_async,
2688 .set_port = xs_set_port,
2689 .connect = xs_connect,
2690 .get_srcaddr = xs_sock_srcaddr,
2691 .get_srcport = xs_sock_srcport,
2692 .buf_alloc = rpc_malloc,
2693 .buf_free = rpc_free,
2694 .send_request = xs_udp_send_request,
2695 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2696 .timer = xs_udp_timer,
2697 .release_request = xprt_release_rqst_cong,
2698 .close = xs_close,
2699 .destroy = xs_destroy,
2700 .print_stats = xs_udp_print_stats,
2701 .enable_swap = xs_enable_swap,
2702 .disable_swap = xs_disable_swap,
2703 .inject_disconnect = xs_inject_disconnect,
2704};
2705
2706static const struct rpc_xprt_ops xs_tcp_ops = {
2707 .reserve_xprt = xprt_reserve_xprt,
2708 .release_xprt = xprt_release_xprt,
2709 .alloc_slot = xprt_alloc_slot,
2710 .free_slot = xprt_free_slot,
2711 .rpcbind = rpcb_getport_async,
2712 .set_port = xs_set_port,
2713 .connect = xs_connect,
2714 .get_srcaddr = xs_sock_srcaddr,
2715 .get_srcport = xs_sock_srcport,
2716 .buf_alloc = rpc_malloc,
2717 .buf_free = rpc_free,
2718 .prepare_request = xs_stream_prepare_request,
2719 .send_request = xs_tcp_send_request,
2720 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2721 .close = xs_tcp_shutdown,
2722 .destroy = xs_destroy,
2723 .set_connect_timeout = xs_tcp_set_connect_timeout,
2724 .print_stats = xs_tcp_print_stats,
2725 .enable_swap = xs_enable_swap,
2726 .disable_swap = xs_disable_swap,
2727 .inject_disconnect = xs_inject_disconnect,
2728#ifdef CONFIG_SUNRPC_BACKCHANNEL
2729 .bc_setup = xprt_setup_bc,
2730 .bc_maxpayload = xs_tcp_bc_maxpayload,
2731 .bc_num_slots = xprt_bc_max_slots,
2732 .bc_free_rqst = xprt_free_bc_rqst,
2733 .bc_destroy = xprt_destroy_bc,
2734#endif
2735};
2736
2737/*
2738 * The rpc_xprt_ops for the server backchannel
2739 */
2740
2741static const struct rpc_xprt_ops bc_tcp_ops = {
2742 .reserve_xprt = xprt_reserve_xprt,
2743 .release_xprt = xprt_release_xprt,
2744 .alloc_slot = xprt_alloc_slot,
2745 .free_slot = xprt_free_slot,
2746 .buf_alloc = bc_malloc,
2747 .buf_free = bc_free,
2748 .send_request = bc_send_request,
2749 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2750 .close = bc_close,
2751 .destroy = bc_destroy,
2752 .print_stats = xs_tcp_print_stats,
2753 .enable_swap = xs_enable_swap,
2754 .disable_swap = xs_disable_swap,
2755 .inject_disconnect = xs_inject_disconnect,
2756};
2757
2758static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2759{
2760 static const struct sockaddr_in sin = {
2761 .sin_family = AF_INET,
2762 .sin_addr.s_addr = htonl(INADDR_ANY),
2763 };
2764 static const struct sockaddr_in6 sin6 = {
2765 .sin6_family = AF_INET6,
2766 .sin6_addr = IN6ADDR_ANY_INIT,
2767 };
2768
2769 switch (family) {
2770 case AF_LOCAL:
2771 break;
2772 case AF_INET:
2773 memcpy(sap, &sin, sizeof(sin));
2774 break;
2775 case AF_INET6:
2776 memcpy(sap, &sin6, sizeof(sin6));
2777 break;
2778 default:
2779 dprintk("RPC: %s: Bad address family\n", __func__);
2780 return -EAFNOSUPPORT;
2781 }
2782 return 0;
2783}
2784
2785static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2786 unsigned int slot_table_size,
2787 unsigned int max_slot_table_size)
2788{
2789 struct rpc_xprt *xprt;
2790 struct sock_xprt *new;
2791
2792 if (args->addrlen > sizeof(xprt->addr)) {
2793 dprintk("RPC: xs_setup_xprt: address too large\n");
2794 return ERR_PTR(-EBADF);
2795 }
2796
2797 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2798 max_slot_table_size);
2799 if (xprt == NULL) {
2800 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2801 "rpc_xprt\n");
2802 return ERR_PTR(-ENOMEM);
2803 }
2804
2805 new = container_of(xprt, struct sock_xprt, xprt);
2806 mutex_init(&new->recv_mutex);
2807 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2808 xprt->addrlen = args->addrlen;
2809 if (args->srcaddr)
2810 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2811 else {
2812 int err;
2813 err = xs_init_anyaddr(args->dstaddr->sa_family,
2814 (struct sockaddr *)&new->srcaddr);
2815 if (err != 0) {
2816 xprt_free(xprt);
2817 return ERR_PTR(err);
2818 }
2819 }
2820
2821 return xprt;
2822}
2823
2824static const struct rpc_timeout xs_local_default_timeout = {
2825 .to_initval = 10 * HZ,
2826 .to_maxval = 10 * HZ,
2827 .to_retries = 2,
2828};
2829
2830/**
2831 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2832 * @args: rpc transport creation arguments
2833 *
2834 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2835 */
2836static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2837{
2838 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2839 struct sock_xprt *transport;
2840 struct rpc_xprt *xprt;
2841 struct rpc_xprt *ret;
2842
2843 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2844 xprt_max_tcp_slot_table_entries);
2845 if (IS_ERR(xprt))
2846 return xprt;
2847 transport = container_of(xprt, struct sock_xprt, xprt);
2848
2849 xprt->prot = 0;
2850 xprt->xprt_class = &xs_local_transport;
2851 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2852
2853 xprt->bind_timeout = XS_BIND_TO;
2854 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2855 xprt->idle_timeout = XS_IDLE_DISC_TO;
2856
2857 xprt->ops = &xs_local_ops;
2858 xprt->timeout = &xs_local_default_timeout;
2859
2860 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2861 INIT_WORK(&transport->error_worker, xs_error_handle);
2862 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2863
2864 switch (sun->sun_family) {
2865 case AF_LOCAL:
2866 if (sun->sun_path[0] != '/') {
2867 dprintk("RPC: bad AF_LOCAL address: %s\n",
2868 sun->sun_path);
2869 ret = ERR_PTR(-EINVAL);
2870 goto out_err;
2871 }
2872 xprt_set_bound(xprt);
2873 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2874 break;
2875 default:
2876 ret = ERR_PTR(-EAFNOSUPPORT);
2877 goto out_err;
2878 }
2879
2880 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2881 xprt->address_strings[RPC_DISPLAY_ADDR]);
2882
2883 if (try_module_get(THIS_MODULE))
2884 return xprt;
2885 ret = ERR_PTR(-EINVAL);
2886out_err:
2887 xs_xprt_free(xprt);
2888 return ret;
2889}
2890
2891static const struct rpc_timeout xs_udp_default_timeout = {
2892 .to_initval = 5 * HZ,
2893 .to_maxval = 30 * HZ,
2894 .to_increment = 5 * HZ,
2895 .to_retries = 5,
2896};
2897
2898/**
2899 * xs_setup_udp - Set up transport to use a UDP socket
2900 * @args: rpc transport creation arguments
2901 *
2902 */
2903static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2904{
2905 struct sockaddr *addr = args->dstaddr;
2906 struct rpc_xprt *xprt;
2907 struct sock_xprt *transport;
2908 struct rpc_xprt *ret;
2909
2910 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2911 xprt_udp_slot_table_entries);
2912 if (IS_ERR(xprt))
2913 return xprt;
2914 transport = container_of(xprt, struct sock_xprt, xprt);
2915
2916 xprt->prot = IPPROTO_UDP;
2917 xprt->xprt_class = &xs_udp_transport;
2918 /* XXX: header size can vary due to auth type, IPv6, etc. */
2919 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2920
2921 xprt->bind_timeout = XS_BIND_TO;
2922 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2923 xprt->idle_timeout = XS_IDLE_DISC_TO;
2924
2925 xprt->ops = &xs_udp_ops;
2926
2927 xprt->timeout = &xs_udp_default_timeout;
2928
2929 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2930 INIT_WORK(&transport->error_worker, xs_error_handle);
2931 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2932
2933 switch (addr->sa_family) {
2934 case AF_INET:
2935 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2936 xprt_set_bound(xprt);
2937
2938 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2939 break;
2940 case AF_INET6:
2941 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2942 xprt_set_bound(xprt);
2943
2944 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2945 break;
2946 default:
2947 ret = ERR_PTR(-EAFNOSUPPORT);
2948 goto out_err;
2949 }
2950
2951 if (xprt_bound(xprt))
2952 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2953 xprt->address_strings[RPC_DISPLAY_ADDR],
2954 xprt->address_strings[RPC_DISPLAY_PORT],
2955 xprt->address_strings[RPC_DISPLAY_PROTO]);
2956 else
2957 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2958 xprt->address_strings[RPC_DISPLAY_ADDR],
2959 xprt->address_strings[RPC_DISPLAY_PROTO]);
2960
2961 if (try_module_get(THIS_MODULE))
2962 return xprt;
2963 ret = ERR_PTR(-EINVAL);
2964out_err:
2965 xs_xprt_free(xprt);
2966 return ret;
2967}
2968
2969static const struct rpc_timeout xs_tcp_default_timeout = {
2970 .to_initval = 60 * HZ,
2971 .to_maxval = 60 * HZ,
2972 .to_retries = 2,
2973};
2974
2975/**
2976 * xs_setup_tcp - Set up transport to use a TCP socket
2977 * @args: rpc transport creation arguments
2978 *
2979 */
2980static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2981{
2982 struct sockaddr *addr = args->dstaddr;
2983 struct rpc_xprt *xprt;
2984 struct sock_xprt *transport;
2985 struct rpc_xprt *ret;
2986 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2987
2988 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2989 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2990
2991 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2992 max_slot_table_size);
2993 if (IS_ERR(xprt))
2994 return xprt;
2995 transport = container_of(xprt, struct sock_xprt, xprt);
2996
2997 xprt->prot = IPPROTO_TCP;
2998 xprt->xprt_class = &xs_tcp_transport;
2999 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3000
3001 xprt->bind_timeout = XS_BIND_TO;
3002 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3003 xprt->idle_timeout = XS_IDLE_DISC_TO;
3004
3005 xprt->ops = &xs_tcp_ops;
3006 xprt->timeout = &xs_tcp_default_timeout;
3007
3008 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3009 xprt->connect_timeout = xprt->timeout->to_initval *
3010 (xprt->timeout->to_retries + 1);
3011
3012 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3013 INIT_WORK(&transport->error_worker, xs_error_handle);
3014 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3015
3016 switch (addr->sa_family) {
3017 case AF_INET:
3018 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3019 xprt_set_bound(xprt);
3020
3021 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3022 break;
3023 case AF_INET6:
3024 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3025 xprt_set_bound(xprt);
3026
3027 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3028 break;
3029 default:
3030 ret = ERR_PTR(-EAFNOSUPPORT);
3031 goto out_err;
3032 }
3033
3034 if (xprt_bound(xprt))
3035 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3036 xprt->address_strings[RPC_DISPLAY_ADDR],
3037 xprt->address_strings[RPC_DISPLAY_PORT],
3038 xprt->address_strings[RPC_DISPLAY_PROTO]);
3039 else
3040 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3041 xprt->address_strings[RPC_DISPLAY_ADDR],
3042 xprt->address_strings[RPC_DISPLAY_PROTO]);
3043
3044 if (try_module_get(THIS_MODULE))
3045 return xprt;
3046 ret = ERR_PTR(-EINVAL);
3047out_err:
3048 xs_xprt_free(xprt);
3049 return ret;
3050}
3051
3052/**
3053 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3054 * @args: rpc transport creation arguments
3055 *
3056 */
3057static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3058{
3059 struct sockaddr *addr = args->dstaddr;
3060 struct rpc_xprt *xprt;
3061 struct sock_xprt *transport;
3062 struct svc_sock *bc_sock;
3063 struct rpc_xprt *ret;
3064
3065 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3066 xprt_tcp_slot_table_entries);
3067 if (IS_ERR(xprt))
3068 return xprt;
3069 transport = container_of(xprt, struct sock_xprt, xprt);
3070
3071 xprt->prot = IPPROTO_TCP;
3072 xprt->xprt_class = &xs_bc_tcp_transport;
3073 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3074 xprt->timeout = &xs_tcp_default_timeout;
3075
3076 /* backchannel */
3077 xprt_set_bound(xprt);
3078 xprt->bind_timeout = 0;
3079 xprt->reestablish_timeout = 0;
3080 xprt->idle_timeout = 0;
3081
3082 xprt->ops = &bc_tcp_ops;
3083
3084 switch (addr->sa_family) {
3085 case AF_INET:
3086 xs_format_peer_addresses(xprt, "tcp",
3087 RPCBIND_NETID_TCP);
3088 break;
3089 case AF_INET6:
3090 xs_format_peer_addresses(xprt, "tcp",
3091 RPCBIND_NETID_TCP6);
3092 break;
3093 default:
3094 ret = ERR_PTR(-EAFNOSUPPORT);
3095 goto out_err;
3096 }
3097
3098 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3099 xprt->address_strings[RPC_DISPLAY_ADDR],
3100 xprt->address_strings[RPC_DISPLAY_PORT],
3101 xprt->address_strings[RPC_DISPLAY_PROTO]);
3102
3103 /*
3104 * Once we've associated a backchannel xprt with a connection,
3105 * we want to keep it around as long as the connection lasts,
3106 * in case we need to start using it for a backchannel again;
3107 * this reference won't be dropped until bc_xprt is destroyed.
3108 */
3109 xprt_get(xprt);
3110 args->bc_xprt->xpt_bc_xprt = xprt;
3111 xprt->bc_xprt = args->bc_xprt;
3112 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3113 transport->sock = bc_sock->sk_sock;
3114 transport->inet = bc_sock->sk_sk;
3115
3116 /*
3117 * Since we don't want connections for the backchannel, we set
3118 * the xprt status to connected
3119 */
3120 xprt_set_connected(xprt);
3121
3122 if (try_module_get(THIS_MODULE))
3123 return xprt;
3124
3125 args->bc_xprt->xpt_bc_xprt = NULL;
3126 args->bc_xprt->xpt_bc_xps = NULL;
3127 xprt_put(xprt);
3128 ret = ERR_PTR(-EINVAL);
3129out_err:
3130 xs_xprt_free(xprt);
3131 return ret;
3132}
3133
3134static struct xprt_class xs_local_transport = {
3135 .list = LIST_HEAD_INIT(xs_local_transport.list),
3136 .name = "named UNIX socket",
3137 .owner = THIS_MODULE,
3138 .ident = XPRT_TRANSPORT_LOCAL,
3139 .setup = xs_setup_local,
3140 .netid = { "" },
3141};
3142
3143static struct xprt_class xs_udp_transport = {
3144 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3145 .name = "udp",
3146 .owner = THIS_MODULE,
3147 .ident = XPRT_TRANSPORT_UDP,
3148 .setup = xs_setup_udp,
3149 .netid = { "udp", "udp6", "" },
3150};
3151
3152static struct xprt_class xs_tcp_transport = {
3153 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3154 .name = "tcp",
3155 .owner = THIS_MODULE,
3156 .ident = XPRT_TRANSPORT_TCP,
3157 .setup = xs_setup_tcp,
3158 .netid = { "tcp", "tcp6", "" },
3159};
3160
3161static struct xprt_class xs_bc_tcp_transport = {
3162 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3163 .name = "tcp NFSv4.1 backchannel",
3164 .owner = THIS_MODULE,
3165 .ident = XPRT_TRANSPORT_BC_TCP,
3166 .setup = xs_setup_bc_tcp,
3167 .netid = { "" },
3168};
3169
3170/**
3171 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3172 *
3173 */
3174int init_socket_xprt(void)
3175{
3176 if (!sunrpc_table_header)
3177 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3178
3179 xprt_register_transport(&xs_local_transport);
3180 xprt_register_transport(&xs_udp_transport);
3181 xprt_register_transport(&xs_tcp_transport);
3182 xprt_register_transport(&xs_bc_tcp_transport);
3183
3184 return 0;
3185}
3186
3187/**
3188 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3189 *
3190 */
3191void cleanup_socket_xprt(void)
3192{
3193 if (sunrpc_table_header) {
3194 unregister_sysctl_table(sunrpc_table_header);
3195 sunrpc_table_header = NULL;
3196 }
3197
3198 xprt_unregister_transport(&xs_local_transport);
3199 xprt_unregister_transport(&xs_udp_transport);
3200 xprt_unregister_transport(&xs_tcp_transport);
3201 xprt_unregister_transport(&xs_bc_tcp_transport);
3202}
3203
3204static int param_set_portnr(const char *val, const struct kernel_param *kp)
3205{
3206 return param_set_uint_minmax(val, kp,
3207 RPC_MIN_RESVPORT,
3208 RPC_MAX_RESVPORT);
3209}
3210
3211static const struct kernel_param_ops param_ops_portnr = {
3212 .set = param_set_portnr,
3213 .get = param_get_uint,
3214};
3215
3216#define param_check_portnr(name, p) \
3217 __param_check(name, p, unsigned int);
3218
3219module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3220module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3221
3222static int param_set_slot_table_size(const char *val,
3223 const struct kernel_param *kp)
3224{
3225 return param_set_uint_minmax(val, kp,
3226 RPC_MIN_SLOT_TABLE,
3227 RPC_MAX_SLOT_TABLE);
3228}
3229
3230static const struct kernel_param_ops param_ops_slot_table_size = {
3231 .set = param_set_slot_table_size,
3232 .get = param_get_uint,
3233};
3234
3235#define param_check_slot_table_size(name, p) \
3236 __param_check(name, p, unsigned int);
3237
3238static int param_set_max_slot_table_size(const char *val,
3239 const struct kernel_param *kp)
3240{
3241 return param_set_uint_minmax(val, kp,
3242 RPC_MIN_SLOT_TABLE,
3243 RPC_MAX_SLOT_TABLE_LIMIT);
3244}
3245
3246static const struct kernel_param_ops param_ops_max_slot_table_size = {
3247 .set = param_set_max_slot_table_size,
3248 .get = param_get_uint,
3249};
3250
3251#define param_check_max_slot_table_size(name, p) \
3252 __param_check(name, p, unsigned int);
3253
3254module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3255 slot_table_size, 0644);
3256module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3257 max_slot_table_size, 0644);
3258module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3259 slot_table_size, 0644);