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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/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/capability.h>
26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
32#include <linux/un.h>
33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
36#include <linux/sunrpc/addr.h>
37#include <linux/sunrpc/sched.h>
38#include <linux/sunrpc/svcsock.h>
39#include <linux/sunrpc/xprtsock.h>
40#include <linux/file.h>
41#ifdef CONFIG_SUNRPC_BACKCHANNEL
42#include <linux/sunrpc/bc_xprt.h>
43#endif
44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
50#include <trace/events/sunrpc.h>
51
52#include "sunrpc.h"
53
54static void xs_close(struct rpc_xprt *xprt);
55
56/*
57 * xprtsock tunables
58 */
59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
65
66#define XS_TCP_LINGER_TO (15U * HZ)
67static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
68
69/*
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
73 *
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
76 */
77
78#ifdef RPC_DEBUG
79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
92static struct ctl_table xs_tunables_table[] = {
93 {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
120 {
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_jiffies,
144 },
145 { },
146};
147
148static struct ctl_table sunrpc_table[] = {
149 {
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
154 { },
155};
156
157#endif
158
159/*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
189#ifdef RPC_DEBUG
190# undef RPC_DEBUG_DATA
191# define RPCDBG_FACILITY RPCDBG_TRANS
192#endif
193
194#ifdef RPC_DEBUG_DATA
195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196{
197 u8 *buf = (u8 *) packet;
198 int j;
199
200 dprintk("RPC: %s\n", msg);
201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214{
215 /* NOP */
216}
217#endif
218
219struct sock_xprt {
220 struct rpc_xprt xprt;
221
222 /*
223 * Network layer
224 */
225 struct socket * sock;
226 struct sock * inet;
227
228 /*
229 * State of TCP reply receive
230 */
231 __be32 tcp_fraghdr,
232 tcp_xid,
233 tcp_calldir;
234
235 u32 tcp_offset,
236 tcp_reclen;
237
238 unsigned long tcp_copied,
239 tcp_flags;
240
241 /*
242 * Connection of transports
243 */
244 struct delayed_work connect_worker;
245 struct sockaddr_storage srcaddr;
246 unsigned short srcport;
247
248 /*
249 * UDP socket buffer size parameters
250 */
251 size_t rcvsize,
252 sndsize;
253
254 /*
255 * Saved socket callback addresses
256 */
257 void (*old_data_ready)(struct sock *);
258 void (*old_state_change)(struct sock *);
259 void (*old_write_space)(struct sock *);
260 void (*old_error_report)(struct sock *);
261};
262
263/*
264 * TCP receive state flags
265 */
266#define TCP_RCV_LAST_FRAG (1UL << 0)
267#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268#define TCP_RCV_COPY_XID (1UL << 2)
269#define TCP_RCV_COPY_DATA (1UL << 3)
270#define TCP_RCV_READ_CALLDIR (1UL << 4)
271#define TCP_RCV_COPY_CALLDIR (1UL << 5)
272
273/*
274 * TCP RPC flags
275 */
276#define TCP_RPC_REPLY (1UL << 6)
277
278static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
279{
280 return (struct rpc_xprt *) sk->sk_user_data;
281}
282
283static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
284{
285 return (struct sockaddr *) &xprt->addr;
286}
287
288static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
289{
290 return (struct sockaddr_un *) &xprt->addr;
291}
292
293static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
294{
295 return (struct sockaddr_in *) &xprt->addr;
296}
297
298static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
299{
300 return (struct sockaddr_in6 *) &xprt->addr;
301}
302
303static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
304{
305 struct sockaddr *sap = xs_addr(xprt);
306 struct sockaddr_in6 *sin6;
307 struct sockaddr_in *sin;
308 struct sockaddr_un *sun;
309 char buf[128];
310
311 switch (sap->sa_family) {
312 case AF_LOCAL:
313 sun = xs_addr_un(xprt);
314 strlcpy(buf, sun->sun_path, sizeof(buf));
315 xprt->address_strings[RPC_DISPLAY_ADDR] =
316 kstrdup(buf, GFP_KERNEL);
317 break;
318 case AF_INET:
319 (void)rpc_ntop(sap, buf, sizeof(buf));
320 xprt->address_strings[RPC_DISPLAY_ADDR] =
321 kstrdup(buf, GFP_KERNEL);
322 sin = xs_addr_in(xprt);
323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
324 break;
325 case AF_INET6:
326 (void)rpc_ntop(sap, buf, sizeof(buf));
327 xprt->address_strings[RPC_DISPLAY_ADDR] =
328 kstrdup(buf, GFP_KERNEL);
329 sin6 = xs_addr_in6(xprt);
330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
331 break;
332 default:
333 BUG();
334 }
335
336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
337}
338
339static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
340{
341 struct sockaddr *sap = xs_addr(xprt);
342 char buf[128];
343
344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
346
347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
349}
350
351static void xs_format_peer_addresses(struct rpc_xprt *xprt,
352 const char *protocol,
353 const char *netid)
354{
355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
357 xs_format_common_peer_addresses(xprt);
358 xs_format_common_peer_ports(xprt);
359}
360
361static void xs_update_peer_port(struct rpc_xprt *xprt)
362{
363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
365
366 xs_format_common_peer_ports(xprt);
367}
368
369static void xs_free_peer_addresses(struct rpc_xprt *xprt)
370{
371 unsigned int i;
372
373 for (i = 0; i < RPC_DISPLAY_MAX; i++)
374 switch (i) {
375 case RPC_DISPLAY_PROTO:
376 case RPC_DISPLAY_NETID:
377 continue;
378 default:
379 kfree(xprt->address_strings[i]);
380 }
381}
382
383#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
384
385static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
386{
387 struct msghdr msg = {
388 .msg_name = addr,
389 .msg_namelen = addrlen,
390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
391 };
392 struct kvec iov = {
393 .iov_base = vec->iov_base + base,
394 .iov_len = vec->iov_len - base,
395 };
396
397 if (iov.iov_len != 0)
398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
399 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
400}
401
402static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
403{
404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
405 int offset, size_t size, int flags);
406 struct page **ppage;
407 unsigned int remainder;
408 int err, sent = 0;
409
410 remainder = xdr->page_len - base;
411 base += xdr->page_base;
412 ppage = xdr->pages + (base >> PAGE_SHIFT);
413 base &= ~PAGE_MASK;
414 do_sendpage = sock->ops->sendpage;
415 if (!zerocopy)
416 do_sendpage = sock_no_sendpage;
417 for(;;) {
418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
419 int flags = XS_SENDMSG_FLAGS;
420
421 remainder -= len;
422 if (remainder != 0 || more)
423 flags |= MSG_MORE;
424 err = do_sendpage(sock, *ppage, base, len, flags);
425 if (remainder == 0 || err != len)
426 break;
427 sent += err;
428 ppage++;
429 base = 0;
430 }
431 if (sent == 0)
432 return err;
433 if (err > 0)
434 sent += err;
435 return sent;
436}
437
438/**
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
445 * @zerocopy: true if it is safe to use sendpage()
446 *
447 */
448static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
449{
450 unsigned int remainder = xdr->len - base;
451 int err, sent = 0;
452
453 if (unlikely(!sock))
454 return -ENOTSOCK;
455
456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
457 if (base != 0) {
458 addr = NULL;
459 addrlen = 0;
460 }
461
462 if (base < xdr->head[0].iov_len || addr != NULL) {
463 unsigned int len = xdr->head[0].iov_len - base;
464 remainder -= len;
465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
466 if (remainder == 0 || err != len)
467 goto out;
468 sent += err;
469 base = 0;
470 } else
471 base -= xdr->head[0].iov_len;
472
473 if (base < xdr->page_len) {
474 unsigned int len = xdr->page_len - base;
475 remainder -= len;
476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
477 if (remainder == 0 || err != len)
478 goto out;
479 sent += err;
480 base = 0;
481 } else
482 base -= xdr->page_len;
483
484 if (base >= xdr->tail[0].iov_len)
485 return sent;
486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
487out:
488 if (sent == 0)
489 return err;
490 if (err > 0)
491 sent += err;
492 return sent;
493}
494
495static void xs_nospace_callback(struct rpc_task *task)
496{
497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
498
499 transport->inet->sk_write_pending--;
500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
501}
502
503/**
504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
506 *
507 */
508static int xs_nospace(struct rpc_task *task)
509{
510 struct rpc_rqst *req = task->tk_rqstp;
511 struct rpc_xprt *xprt = req->rq_xprt;
512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
513 struct sock *sk = transport->inet;
514 int ret = -EAGAIN;
515
516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
517 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
518 req->rq_slen);
519
520 /* Protect against races with write_space */
521 spin_lock_bh(&xprt->transport_lock);
522
523 /* Don't race with disconnect */
524 if (xprt_connected(xprt)) {
525 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
526 /*
527 * Notify TCP that we're limited by the application
528 * window size
529 */
530 set_bit(SOCK_NOSPACE, &transport->sock->flags);
531 sk->sk_write_pending++;
532 /* ...and wait for more buffer space */
533 xprt_wait_for_buffer_space(task, xs_nospace_callback);
534 }
535 } else {
536 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
537 ret = -ENOTCONN;
538 }
539
540 spin_unlock_bh(&xprt->transport_lock);
541
542 /* Race breaker in case memory is freed before above code is called */
543 sk->sk_write_space(sk);
544 return ret;
545}
546
547/*
548 * Construct a stream transport record marker in @buf.
549 */
550static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
551{
552 u32 reclen = buf->len - sizeof(rpc_fraghdr);
553 rpc_fraghdr *base = buf->head[0].iov_base;
554 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
555}
556
557/**
558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
559 * @task: RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568static int xs_local_send_request(struct rpc_task *task)
569{
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport =
573 container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_encode_stream_record_marker(&req->rq_snd_buf);
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base, req->rq_svec->iov_len);
581
582 status = xs_sendpages(transport->sock, NULL, 0,
583 xdr, req->rq_bytes_sent, true);
584 dprintk("RPC: %s(%u) = %d\n",
585 __func__, xdr->len - req->rq_bytes_sent, status);
586 if (likely(status >= 0)) {
587 req->rq_bytes_sent += status;
588 req->rq_xmit_bytes_sent += status;
589 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
590 req->rq_bytes_sent = 0;
591 return 0;
592 }
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -EAGAIN:
598 status = xs_nospace(task);
599 break;
600 default:
601 dprintk("RPC: sendmsg returned unrecognized error %d\n",
602 -status);
603 case -EPIPE:
604 xs_close(xprt);
605 status = -ENOTCONN;
606 }
607
608 return status;
609}
610
611/**
612 * xs_udp_send_request - write an RPC request to a UDP socket
613 * @task: address of RPC task that manages the state of an RPC request
614 *
615 * Return values:
616 * 0: The request has been sent
617 * EAGAIN: The socket was blocked, please call again later to
618 * complete the request
619 * ENOTCONN: Caller needs to invoke connect logic then call again
620 * other: Some other error occurred, the request was not sent
621 */
622static int xs_udp_send_request(struct rpc_task *task)
623{
624 struct rpc_rqst *req = task->tk_rqstp;
625 struct rpc_xprt *xprt = req->rq_xprt;
626 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
627 struct xdr_buf *xdr = &req->rq_snd_buf;
628 int status;
629
630 xs_pktdump("packet data:",
631 req->rq_svec->iov_base,
632 req->rq_svec->iov_len);
633
634 if (!xprt_bound(xprt))
635 return -ENOTCONN;
636 status = xs_sendpages(transport->sock,
637 xs_addr(xprt),
638 xprt->addrlen, xdr,
639 req->rq_bytes_sent, true);
640
641 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
642 xdr->len - req->rq_bytes_sent, status);
643
644 if (status >= 0) {
645 req->rq_xmit_bytes_sent += status;
646 if (status >= req->rq_slen)
647 return 0;
648 /* Still some bytes left; set up for a retry later. */
649 status = -EAGAIN;
650 }
651
652 switch (status) {
653 case -ENOTSOCK:
654 status = -ENOTCONN;
655 /* Should we call xs_close() here? */
656 break;
657 case -EAGAIN:
658 status = xs_nospace(task);
659 break;
660 default:
661 dprintk("RPC: sendmsg returned unrecognized error %d\n",
662 -status);
663 case -ENETUNREACH:
664 case -EPIPE:
665 case -ECONNREFUSED:
666 /* When the server has died, an ICMP port unreachable message
667 * prompts ECONNREFUSED. */
668 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
669 }
670
671 return status;
672}
673
674/**
675 * xs_tcp_shutdown - gracefully shut down a TCP socket
676 * @xprt: transport
677 *
678 * Initiates a graceful shutdown of the TCP socket by calling the
679 * equivalent of shutdown(SHUT_WR);
680 */
681static void xs_tcp_shutdown(struct rpc_xprt *xprt)
682{
683 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
684 struct socket *sock = transport->sock;
685
686 if (sock != NULL) {
687 kernel_sock_shutdown(sock, SHUT_WR);
688 trace_rpc_socket_shutdown(xprt, sock);
689 }
690}
691
692/**
693 * xs_tcp_send_request - write an RPC request to a TCP socket
694 * @task: address of RPC task that manages the state of an RPC request
695 *
696 * Return values:
697 * 0: The request has been sent
698 * EAGAIN: The socket was blocked, please call again later to
699 * complete the request
700 * ENOTCONN: Caller needs to invoke connect logic then call again
701 * other: Some other error occurred, the request was not sent
702 *
703 * XXX: In the case of soft timeouts, should we eventually give up
704 * if sendmsg is not able to make progress?
705 */
706static int xs_tcp_send_request(struct rpc_task *task)
707{
708 struct rpc_rqst *req = task->tk_rqstp;
709 struct rpc_xprt *xprt = req->rq_xprt;
710 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
711 struct xdr_buf *xdr = &req->rq_snd_buf;
712 bool zerocopy = true;
713 int status;
714
715 xs_encode_stream_record_marker(&req->rq_snd_buf);
716
717 xs_pktdump("packet data:",
718 req->rq_svec->iov_base,
719 req->rq_svec->iov_len);
720 /* Don't use zero copy if this is a resend. If the RPC call
721 * completes while the socket holds a reference to the pages,
722 * then we may end up resending corrupted data.
723 */
724 if (task->tk_flags & RPC_TASK_SENT)
725 zerocopy = false;
726
727 /* Continue transmitting the packet/record. We must be careful
728 * to cope with writespace callbacks arriving _after_ we have
729 * called sendmsg(). */
730 while (1) {
731 status = xs_sendpages(transport->sock,
732 NULL, 0, xdr, req->rq_bytes_sent,
733 zerocopy);
734
735 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
736 xdr->len - req->rq_bytes_sent, status);
737
738 if (unlikely(status < 0))
739 break;
740
741 /* If we've sent the entire packet, immediately
742 * reset the count of bytes sent. */
743 req->rq_bytes_sent += status;
744 req->rq_xmit_bytes_sent += status;
745 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
746 req->rq_bytes_sent = 0;
747 return 0;
748 }
749
750 if (status != 0)
751 continue;
752 status = -EAGAIN;
753 break;
754 }
755
756 switch (status) {
757 case -ENOTSOCK:
758 status = -ENOTCONN;
759 /* Should we call xs_close() here? */
760 break;
761 case -EAGAIN:
762 status = xs_nospace(task);
763 break;
764 default:
765 dprintk("RPC: sendmsg returned unrecognized error %d\n",
766 -status);
767 case -ECONNRESET:
768 xs_tcp_shutdown(xprt);
769 case -ECONNREFUSED:
770 case -ENOTCONN:
771 case -EPIPE:
772 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
773 }
774
775 return status;
776}
777
778/**
779 * xs_tcp_release_xprt - clean up after a tcp transmission
780 * @xprt: transport
781 * @task: rpc task
782 *
783 * This cleans up if an error causes us to abort the transmission of a request.
784 * In this case, the socket may need to be reset in order to avoid confusing
785 * the server.
786 */
787static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
788{
789 struct rpc_rqst *req;
790
791 if (task != xprt->snd_task)
792 return;
793 if (task == NULL)
794 goto out_release;
795 req = task->tk_rqstp;
796 if (req == NULL)
797 goto out_release;
798 if (req->rq_bytes_sent == 0)
799 goto out_release;
800 if (req->rq_bytes_sent == req->rq_snd_buf.len)
801 goto out_release;
802 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
803out_release:
804 xprt_release_xprt(xprt, task);
805}
806
807static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
808{
809 transport->old_data_ready = sk->sk_data_ready;
810 transport->old_state_change = sk->sk_state_change;
811 transport->old_write_space = sk->sk_write_space;
812 transport->old_error_report = sk->sk_error_report;
813}
814
815static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
816{
817 sk->sk_data_ready = transport->old_data_ready;
818 sk->sk_state_change = transport->old_state_change;
819 sk->sk_write_space = transport->old_write_space;
820 sk->sk_error_report = transport->old_error_report;
821}
822
823/**
824 * xs_error_report - callback to handle TCP socket state errors
825 * @sk: socket
826 *
827 * Note: we don't call sock_error() since there may be a rpc_task
828 * using the socket, and so we don't want to clear sk->sk_err.
829 */
830static void xs_error_report(struct sock *sk)
831{
832 struct rpc_xprt *xprt;
833 int err;
834
835 read_lock_bh(&sk->sk_callback_lock);
836 if (!(xprt = xprt_from_sock(sk)))
837 goto out;
838
839 err = -sk->sk_err;
840 if (err == 0)
841 goto out;
842 dprintk("RPC: xs_error_report client %p, error=%d...\n",
843 xprt, -err);
844 trace_rpc_socket_error(xprt, sk->sk_socket, err);
845 xprt_wake_pending_tasks(xprt, err);
846 out:
847 read_unlock_bh(&sk->sk_callback_lock);
848}
849
850static void xs_reset_transport(struct sock_xprt *transport)
851{
852 struct socket *sock = transport->sock;
853 struct sock *sk = transport->inet;
854
855 if (sk == NULL)
856 return;
857
858 transport->srcport = 0;
859
860 write_lock_bh(&sk->sk_callback_lock);
861 transport->inet = NULL;
862 transport->sock = NULL;
863
864 sk->sk_user_data = NULL;
865
866 xs_restore_old_callbacks(transport, sk);
867 write_unlock_bh(&sk->sk_callback_lock);
868
869 sk->sk_no_check = 0;
870
871 trace_rpc_socket_close(&transport->xprt, sock);
872 sock_release(sock);
873}
874
875/**
876 * xs_close - close a socket
877 * @xprt: transport
878 *
879 * This is used when all requests are complete; ie, no DRC state remains
880 * on the server we want to save.
881 *
882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
883 * xs_reset_transport() zeroing the socket from underneath a writer.
884 */
885static void xs_close(struct rpc_xprt *xprt)
886{
887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
888
889 dprintk("RPC: xs_close xprt %p\n", xprt);
890
891 cancel_delayed_work_sync(&transport->connect_worker);
892
893 xs_reset_transport(transport);
894 xprt->reestablish_timeout = 0;
895
896 smp_mb__before_clear_bit();
897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
898 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
899 clear_bit(XPRT_CLOSING, &xprt->state);
900 smp_mb__after_clear_bit();
901 xprt_disconnect_done(xprt);
902}
903
904static void xs_tcp_close(struct rpc_xprt *xprt)
905{
906 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
907 xs_close(xprt);
908 else
909 xs_tcp_shutdown(xprt);
910}
911
912static void xs_xprt_free(struct rpc_xprt *xprt)
913{
914 xs_free_peer_addresses(xprt);
915 xprt_free(xprt);
916}
917
918/**
919 * xs_destroy - prepare to shutdown a transport
920 * @xprt: doomed transport
921 *
922 */
923static void xs_destroy(struct rpc_xprt *xprt)
924{
925 dprintk("RPC: xs_destroy xprt %p\n", xprt);
926
927 xs_close(xprt);
928 xs_xprt_free(xprt);
929 module_put(THIS_MODULE);
930}
931
932static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
933{
934 struct xdr_skb_reader desc = {
935 .skb = skb,
936 .offset = sizeof(rpc_fraghdr),
937 .count = skb->len - sizeof(rpc_fraghdr),
938 };
939
940 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
941 return -1;
942 if (desc.count)
943 return -1;
944 return 0;
945}
946
947/**
948 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
949 * @sk: socket with data to read
950 * @len: how much data to read
951 *
952 * Currently this assumes we can read the whole reply in a single gulp.
953 */
954static void xs_local_data_ready(struct sock *sk)
955{
956 struct rpc_task *task;
957 struct rpc_xprt *xprt;
958 struct rpc_rqst *rovr;
959 struct sk_buff *skb;
960 int err, repsize, copied;
961 u32 _xid;
962 __be32 *xp;
963
964 read_lock_bh(&sk->sk_callback_lock);
965 dprintk("RPC: %s...\n", __func__);
966 xprt = xprt_from_sock(sk);
967 if (xprt == NULL)
968 goto out;
969
970 skb = skb_recv_datagram(sk, 0, 1, &err);
971 if (skb == NULL)
972 goto out;
973
974 repsize = skb->len - sizeof(rpc_fraghdr);
975 if (repsize < 4) {
976 dprintk("RPC: impossible RPC reply size %d\n", repsize);
977 goto dropit;
978 }
979
980 /* Copy the XID from the skb... */
981 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
982 if (xp == NULL)
983 goto dropit;
984
985 /* Look up and lock the request corresponding to the given XID */
986 spin_lock(&xprt->transport_lock);
987 rovr = xprt_lookup_rqst(xprt, *xp);
988 if (!rovr)
989 goto out_unlock;
990 task = rovr->rq_task;
991
992 copied = rovr->rq_private_buf.buflen;
993 if (copied > repsize)
994 copied = repsize;
995
996 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
997 dprintk("RPC: sk_buff copy failed\n");
998 goto out_unlock;
999 }
1000
1001 xprt_complete_rqst(task, copied);
1002
1003 out_unlock:
1004 spin_unlock(&xprt->transport_lock);
1005 dropit:
1006 skb_free_datagram(sk, skb);
1007 out:
1008 read_unlock_bh(&sk->sk_callback_lock);
1009}
1010
1011/**
1012 * xs_udp_data_ready - "data ready" callback for UDP sockets
1013 * @sk: socket with data to read
1014 * @len: how much data to read
1015 *
1016 */
1017static void xs_udp_data_ready(struct sock *sk)
1018{
1019 struct rpc_task *task;
1020 struct rpc_xprt *xprt;
1021 struct rpc_rqst *rovr;
1022 struct sk_buff *skb;
1023 int err, repsize, copied;
1024 u32 _xid;
1025 __be32 *xp;
1026
1027 read_lock_bh(&sk->sk_callback_lock);
1028 dprintk("RPC: xs_udp_data_ready...\n");
1029 if (!(xprt = xprt_from_sock(sk)))
1030 goto out;
1031
1032 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1033 goto out;
1034
1035 repsize = skb->len - sizeof(struct udphdr);
1036 if (repsize < 4) {
1037 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1038 goto dropit;
1039 }
1040
1041 /* Copy the XID from the skb... */
1042 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1043 sizeof(_xid), &_xid);
1044 if (xp == NULL)
1045 goto dropit;
1046
1047 /* Look up and lock the request corresponding to the given XID */
1048 spin_lock(&xprt->transport_lock);
1049 rovr = xprt_lookup_rqst(xprt, *xp);
1050 if (!rovr)
1051 goto out_unlock;
1052 task = rovr->rq_task;
1053
1054 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1055 copied = repsize;
1056
1057 /* Suck it into the iovec, verify checksum if not done by hw. */
1058 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1059 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1060 goto out_unlock;
1061 }
1062
1063 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1064
1065 xprt_adjust_cwnd(xprt, task, copied);
1066 xprt_complete_rqst(task, copied);
1067
1068 out_unlock:
1069 spin_unlock(&xprt->transport_lock);
1070 dropit:
1071 skb_free_datagram(sk, skb);
1072 out:
1073 read_unlock_bh(&sk->sk_callback_lock);
1074}
1075
1076/*
1077 * Helper function to force a TCP close if the server is sending
1078 * junk and/or it has put us in CLOSE_WAIT
1079 */
1080static void xs_tcp_force_close(struct rpc_xprt *xprt)
1081{
1082 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1083 xprt_force_disconnect(xprt);
1084}
1085
1086static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1087{
1088 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1089 size_t len, used;
1090 char *p;
1091
1092 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1093 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1094 used = xdr_skb_read_bits(desc, p, len);
1095 transport->tcp_offset += used;
1096 if (used != len)
1097 return;
1098
1099 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1100 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1101 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1102 else
1103 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1104 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1105
1106 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1107 transport->tcp_offset = 0;
1108
1109 /* Sanity check of the record length */
1110 if (unlikely(transport->tcp_reclen < 8)) {
1111 dprintk("RPC: invalid TCP record fragment length\n");
1112 xs_tcp_force_close(xprt);
1113 return;
1114 }
1115 dprintk("RPC: reading TCP record fragment of length %d\n",
1116 transport->tcp_reclen);
1117}
1118
1119static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1120{
1121 if (transport->tcp_offset == transport->tcp_reclen) {
1122 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1123 transport->tcp_offset = 0;
1124 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1125 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1126 transport->tcp_flags |= TCP_RCV_COPY_XID;
1127 transport->tcp_copied = 0;
1128 }
1129 }
1130}
1131
1132static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1133{
1134 size_t len, used;
1135 char *p;
1136
1137 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1138 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1139 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1140 used = xdr_skb_read_bits(desc, p, len);
1141 transport->tcp_offset += used;
1142 if (used != len)
1143 return;
1144 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1145 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1146 transport->tcp_copied = 4;
1147 dprintk("RPC: reading %s XID %08x\n",
1148 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1149 : "request with",
1150 ntohl(transport->tcp_xid));
1151 xs_tcp_check_fraghdr(transport);
1152}
1153
1154static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1155 struct xdr_skb_reader *desc)
1156{
1157 size_t len, used;
1158 u32 offset;
1159 char *p;
1160
1161 /*
1162 * We want transport->tcp_offset to be 8 at the end of this routine
1163 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1164 * When this function is called for the first time,
1165 * transport->tcp_offset is 4 (after having already read the xid).
1166 */
1167 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1168 len = sizeof(transport->tcp_calldir) - offset;
1169 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1170 p = ((char *) &transport->tcp_calldir) + offset;
1171 used = xdr_skb_read_bits(desc, p, len);
1172 transport->tcp_offset += used;
1173 if (used != len)
1174 return;
1175 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1176 /*
1177 * We don't yet have the XDR buffer, so we will write the calldir
1178 * out after we get the buffer from the 'struct rpc_rqst'
1179 */
1180 switch (ntohl(transport->tcp_calldir)) {
1181 case RPC_REPLY:
1182 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1183 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1184 transport->tcp_flags |= TCP_RPC_REPLY;
1185 break;
1186 case RPC_CALL:
1187 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1188 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1189 transport->tcp_flags &= ~TCP_RPC_REPLY;
1190 break;
1191 default:
1192 dprintk("RPC: invalid request message type\n");
1193 xs_tcp_force_close(&transport->xprt);
1194 }
1195 xs_tcp_check_fraghdr(transport);
1196}
1197
1198static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1199 struct xdr_skb_reader *desc,
1200 struct rpc_rqst *req)
1201{
1202 struct sock_xprt *transport =
1203 container_of(xprt, struct sock_xprt, xprt);
1204 struct xdr_buf *rcvbuf;
1205 size_t len;
1206 ssize_t r;
1207
1208 rcvbuf = &req->rq_private_buf;
1209
1210 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1211 /*
1212 * Save the RPC direction in the XDR buffer
1213 */
1214 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1215 &transport->tcp_calldir,
1216 sizeof(transport->tcp_calldir));
1217 transport->tcp_copied += sizeof(transport->tcp_calldir);
1218 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1219 }
1220
1221 len = desc->count;
1222 if (len > transport->tcp_reclen - transport->tcp_offset) {
1223 struct xdr_skb_reader my_desc;
1224
1225 len = transport->tcp_reclen - transport->tcp_offset;
1226 memcpy(&my_desc, desc, sizeof(my_desc));
1227 my_desc.count = len;
1228 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1229 &my_desc, xdr_skb_read_bits);
1230 desc->count -= r;
1231 desc->offset += r;
1232 } else
1233 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1234 desc, xdr_skb_read_bits);
1235
1236 if (r > 0) {
1237 transport->tcp_copied += r;
1238 transport->tcp_offset += r;
1239 }
1240 if (r != len) {
1241 /* Error when copying to the receive buffer,
1242 * usually because we weren't able to allocate
1243 * additional buffer pages. All we can do now
1244 * is turn off TCP_RCV_COPY_DATA, so the request
1245 * will not receive any additional updates,
1246 * and time out.
1247 * Any remaining data from this record will
1248 * be discarded.
1249 */
1250 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1251 dprintk("RPC: XID %08x truncated request\n",
1252 ntohl(transport->tcp_xid));
1253 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1254 "tcp_offset = %u, tcp_reclen = %u\n",
1255 xprt, transport->tcp_copied,
1256 transport->tcp_offset, transport->tcp_reclen);
1257 return;
1258 }
1259
1260 dprintk("RPC: XID %08x read %Zd bytes\n",
1261 ntohl(transport->tcp_xid), r);
1262 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1263 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1264 transport->tcp_offset, transport->tcp_reclen);
1265
1266 if (transport->tcp_copied == req->rq_private_buf.buflen)
1267 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1268 else if (transport->tcp_offset == transport->tcp_reclen) {
1269 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1270 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1271 }
1272}
1273
1274/*
1275 * Finds the request corresponding to the RPC xid and invokes the common
1276 * tcp read code to read the data.
1277 */
1278static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1279 struct xdr_skb_reader *desc)
1280{
1281 struct sock_xprt *transport =
1282 container_of(xprt, struct sock_xprt, xprt);
1283 struct rpc_rqst *req;
1284
1285 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1286
1287 /* Find and lock the request corresponding to this xid */
1288 spin_lock(&xprt->transport_lock);
1289 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1290 if (!req) {
1291 dprintk("RPC: XID %08x request not found!\n",
1292 ntohl(transport->tcp_xid));
1293 spin_unlock(&xprt->transport_lock);
1294 return -1;
1295 }
1296
1297 xs_tcp_read_common(xprt, desc, req);
1298
1299 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1300 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1301
1302 spin_unlock(&xprt->transport_lock);
1303 return 0;
1304}
1305
1306#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1307/*
1308 * Obtains an rpc_rqst previously allocated and invokes the common
1309 * tcp read code to read the data. The result is placed in the callback
1310 * queue.
1311 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1312 * connection and return -1.
1313 */
1314static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1315 struct xdr_skb_reader *desc)
1316{
1317 struct sock_xprt *transport =
1318 container_of(xprt, struct sock_xprt, xprt);
1319 struct rpc_rqst *req;
1320
1321 /* Look up and lock the request corresponding to the given XID */
1322 spin_lock(&xprt->transport_lock);
1323 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1324 if (req == NULL) {
1325 spin_unlock(&xprt->transport_lock);
1326 printk(KERN_WARNING "Callback slot table overflowed\n");
1327 xprt_force_disconnect(xprt);
1328 return -1;
1329 }
1330
1331 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1332 xs_tcp_read_common(xprt, desc, req);
1333
1334 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1335 xprt_complete_bc_request(req, transport->tcp_copied);
1336 spin_unlock(&xprt->transport_lock);
1337
1338 return 0;
1339}
1340
1341static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1342 struct xdr_skb_reader *desc)
1343{
1344 struct sock_xprt *transport =
1345 container_of(xprt, struct sock_xprt, xprt);
1346
1347 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1348 xs_tcp_read_reply(xprt, desc) :
1349 xs_tcp_read_callback(xprt, desc);
1350}
1351#else
1352static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1353 struct xdr_skb_reader *desc)
1354{
1355 return xs_tcp_read_reply(xprt, desc);
1356}
1357#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1358
1359/*
1360 * Read data off the transport. This can be either an RPC_CALL or an
1361 * RPC_REPLY. Relay the processing to helper functions.
1362 */
1363static void xs_tcp_read_data(struct rpc_xprt *xprt,
1364 struct xdr_skb_reader *desc)
1365{
1366 struct sock_xprt *transport =
1367 container_of(xprt, struct sock_xprt, xprt);
1368
1369 if (_xs_tcp_read_data(xprt, desc) == 0)
1370 xs_tcp_check_fraghdr(transport);
1371 else {
1372 /*
1373 * The transport_lock protects the request handling.
1374 * There's no need to hold it to update the tcp_flags.
1375 */
1376 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1377 }
1378}
1379
1380static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1381{
1382 size_t len;
1383
1384 len = transport->tcp_reclen - transport->tcp_offset;
1385 if (len > desc->count)
1386 len = desc->count;
1387 desc->count -= len;
1388 desc->offset += len;
1389 transport->tcp_offset += len;
1390 dprintk("RPC: discarded %Zu bytes\n", len);
1391 xs_tcp_check_fraghdr(transport);
1392}
1393
1394static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1395{
1396 struct rpc_xprt *xprt = rd_desc->arg.data;
1397 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1398 struct xdr_skb_reader desc = {
1399 .skb = skb,
1400 .offset = offset,
1401 .count = len,
1402 };
1403
1404 dprintk("RPC: xs_tcp_data_recv started\n");
1405 do {
1406 /* Read in a new fragment marker if necessary */
1407 /* Can we ever really expect to get completely empty fragments? */
1408 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1409 xs_tcp_read_fraghdr(xprt, &desc);
1410 continue;
1411 }
1412 /* Read in the xid if necessary */
1413 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1414 xs_tcp_read_xid(transport, &desc);
1415 continue;
1416 }
1417 /* Read in the call/reply flag */
1418 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1419 xs_tcp_read_calldir(transport, &desc);
1420 continue;
1421 }
1422 /* Read in the request data */
1423 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1424 xs_tcp_read_data(xprt, &desc);
1425 continue;
1426 }
1427 /* Skip over any trailing bytes on short reads */
1428 xs_tcp_read_discard(transport, &desc);
1429 } while (desc.count);
1430 dprintk("RPC: xs_tcp_data_recv done\n");
1431 return len - desc.count;
1432}
1433
1434/**
1435 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1436 * @sk: socket with data to read
1437 * @bytes: how much data to read
1438 *
1439 */
1440static void xs_tcp_data_ready(struct sock *sk)
1441{
1442 struct rpc_xprt *xprt;
1443 read_descriptor_t rd_desc;
1444 int read;
1445
1446 dprintk("RPC: xs_tcp_data_ready...\n");
1447
1448 read_lock_bh(&sk->sk_callback_lock);
1449 if (!(xprt = xprt_from_sock(sk)))
1450 goto out;
1451 /* Any data means we had a useful conversation, so
1452 * the we don't need to delay the next reconnect
1453 */
1454 if (xprt->reestablish_timeout)
1455 xprt->reestablish_timeout = 0;
1456
1457 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1458 rd_desc.arg.data = xprt;
1459 do {
1460 rd_desc.count = 65536;
1461 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1462 } while (read > 0);
1463out:
1464 read_unlock_bh(&sk->sk_callback_lock);
1465}
1466
1467/*
1468 * Do the equivalent of linger/linger2 handling for dealing with
1469 * broken servers that don't close the socket in a timely
1470 * fashion
1471 */
1472static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1473 unsigned long timeout)
1474{
1475 struct sock_xprt *transport;
1476
1477 if (xprt_test_and_set_connecting(xprt))
1478 return;
1479 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1480 transport = container_of(xprt, struct sock_xprt, xprt);
1481 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1482 timeout);
1483}
1484
1485static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1486{
1487 struct sock_xprt *transport;
1488
1489 transport = container_of(xprt, struct sock_xprt, xprt);
1490
1491 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1492 !cancel_delayed_work(&transport->connect_worker))
1493 return;
1494 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1495 xprt_clear_connecting(xprt);
1496}
1497
1498static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1499{
1500 smp_mb__before_clear_bit();
1501 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1502 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1503 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1504 clear_bit(XPRT_CLOSING, &xprt->state);
1505 smp_mb__after_clear_bit();
1506}
1507
1508static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1509{
1510 xs_sock_reset_connection_flags(xprt);
1511 /* Mark transport as closed and wake up all pending tasks */
1512 xprt_disconnect_done(xprt);
1513}
1514
1515/**
1516 * xs_tcp_state_change - callback to handle TCP socket state changes
1517 * @sk: socket whose state has changed
1518 *
1519 */
1520static void xs_tcp_state_change(struct sock *sk)
1521{
1522 struct rpc_xprt *xprt;
1523
1524 read_lock_bh(&sk->sk_callback_lock);
1525 if (!(xprt = xprt_from_sock(sk)))
1526 goto out;
1527 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1528 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1529 sk->sk_state, xprt_connected(xprt),
1530 sock_flag(sk, SOCK_DEAD),
1531 sock_flag(sk, SOCK_ZAPPED),
1532 sk->sk_shutdown);
1533
1534 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1535 switch (sk->sk_state) {
1536 case TCP_ESTABLISHED:
1537 spin_lock(&xprt->transport_lock);
1538 if (!xprt_test_and_set_connected(xprt)) {
1539 struct sock_xprt *transport = container_of(xprt,
1540 struct sock_xprt, xprt);
1541
1542 /* Reset TCP record info */
1543 transport->tcp_offset = 0;
1544 transport->tcp_reclen = 0;
1545 transport->tcp_copied = 0;
1546 transport->tcp_flags =
1547 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1548 xprt->connect_cookie++;
1549
1550 xprt_wake_pending_tasks(xprt, -EAGAIN);
1551 }
1552 spin_unlock(&xprt->transport_lock);
1553 break;
1554 case TCP_FIN_WAIT1:
1555 /* The client initiated a shutdown of the socket */
1556 xprt->connect_cookie++;
1557 xprt->reestablish_timeout = 0;
1558 set_bit(XPRT_CLOSING, &xprt->state);
1559 smp_mb__before_clear_bit();
1560 clear_bit(XPRT_CONNECTED, &xprt->state);
1561 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1562 smp_mb__after_clear_bit();
1563 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1564 break;
1565 case TCP_CLOSE_WAIT:
1566 /* The server initiated a shutdown of the socket */
1567 xprt->connect_cookie++;
1568 clear_bit(XPRT_CONNECTED, &xprt->state);
1569 xs_tcp_force_close(xprt);
1570 case TCP_CLOSING:
1571 /*
1572 * If the server closed down the connection, make sure that
1573 * we back off before reconnecting
1574 */
1575 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1576 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1577 break;
1578 case TCP_LAST_ACK:
1579 set_bit(XPRT_CLOSING, &xprt->state);
1580 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1581 smp_mb__before_clear_bit();
1582 clear_bit(XPRT_CONNECTED, &xprt->state);
1583 smp_mb__after_clear_bit();
1584 break;
1585 case TCP_CLOSE:
1586 xs_tcp_cancel_linger_timeout(xprt);
1587 xs_sock_mark_closed(xprt);
1588 }
1589 out:
1590 read_unlock_bh(&sk->sk_callback_lock);
1591}
1592
1593static void xs_write_space(struct sock *sk)
1594{
1595 struct socket *sock;
1596 struct rpc_xprt *xprt;
1597
1598 if (unlikely(!(sock = sk->sk_socket)))
1599 return;
1600 clear_bit(SOCK_NOSPACE, &sock->flags);
1601
1602 if (unlikely(!(xprt = xprt_from_sock(sk))))
1603 return;
1604 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1605 return;
1606
1607 xprt_write_space(xprt);
1608}
1609
1610/**
1611 * xs_udp_write_space - callback invoked when socket buffer space
1612 * becomes available
1613 * @sk: socket whose state has changed
1614 *
1615 * Called when more output buffer space is available for this socket.
1616 * We try not to wake our writers until they can make "significant"
1617 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1618 * with a bunch of small requests.
1619 */
1620static void xs_udp_write_space(struct sock *sk)
1621{
1622 read_lock_bh(&sk->sk_callback_lock);
1623
1624 /* from net/core/sock.c:sock_def_write_space */
1625 if (sock_writeable(sk))
1626 xs_write_space(sk);
1627
1628 read_unlock_bh(&sk->sk_callback_lock);
1629}
1630
1631/**
1632 * xs_tcp_write_space - callback invoked when socket buffer space
1633 * becomes available
1634 * @sk: socket whose state has changed
1635 *
1636 * Called when more output buffer space is available for this socket.
1637 * We try not to wake our writers until they can make "significant"
1638 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1639 * with a bunch of small requests.
1640 */
1641static void xs_tcp_write_space(struct sock *sk)
1642{
1643 read_lock_bh(&sk->sk_callback_lock);
1644
1645 /* from net/core/stream.c:sk_stream_write_space */
1646 if (sk_stream_is_writeable(sk))
1647 xs_write_space(sk);
1648
1649 read_unlock_bh(&sk->sk_callback_lock);
1650}
1651
1652static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1653{
1654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1655 struct sock *sk = transport->inet;
1656
1657 if (transport->rcvsize) {
1658 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1659 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1660 }
1661 if (transport->sndsize) {
1662 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1663 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1664 sk->sk_write_space(sk);
1665 }
1666}
1667
1668/**
1669 * xs_udp_set_buffer_size - set send and receive limits
1670 * @xprt: generic transport
1671 * @sndsize: requested size of send buffer, in bytes
1672 * @rcvsize: requested size of receive buffer, in bytes
1673 *
1674 * Set socket send and receive buffer size limits.
1675 */
1676static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1677{
1678 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1679
1680 transport->sndsize = 0;
1681 if (sndsize)
1682 transport->sndsize = sndsize + 1024;
1683 transport->rcvsize = 0;
1684 if (rcvsize)
1685 transport->rcvsize = rcvsize + 1024;
1686
1687 xs_udp_do_set_buffer_size(xprt);
1688}
1689
1690/**
1691 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1692 * @task: task that timed out
1693 *
1694 * Adjust the congestion window after a retransmit timeout has occurred.
1695 */
1696static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1697{
1698 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1699}
1700
1701static unsigned short xs_get_random_port(void)
1702{
1703 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1704 unsigned short rand = (unsigned short) prandom_u32() % range;
1705 return rand + xprt_min_resvport;
1706}
1707
1708/**
1709 * xs_set_port - reset the port number in the remote endpoint address
1710 * @xprt: generic transport
1711 * @port: new port number
1712 *
1713 */
1714static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1715{
1716 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1717
1718 rpc_set_port(xs_addr(xprt), port);
1719 xs_update_peer_port(xprt);
1720}
1721
1722static unsigned short xs_get_srcport(struct sock_xprt *transport)
1723{
1724 unsigned short port = transport->srcport;
1725
1726 if (port == 0 && transport->xprt.resvport)
1727 port = xs_get_random_port();
1728 return port;
1729}
1730
1731static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1732{
1733 if (transport->srcport != 0)
1734 transport->srcport = 0;
1735 if (!transport->xprt.resvport)
1736 return 0;
1737 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1738 return xprt_max_resvport;
1739 return --port;
1740}
1741static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1742{
1743 struct sockaddr_storage myaddr;
1744 int err, nloop = 0;
1745 unsigned short port = xs_get_srcport(transport);
1746 unsigned short last;
1747
1748 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1749 do {
1750 rpc_set_port((struct sockaddr *)&myaddr, port);
1751 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1752 transport->xprt.addrlen);
1753 if (port == 0)
1754 break;
1755 if (err == 0) {
1756 transport->srcport = port;
1757 break;
1758 }
1759 last = port;
1760 port = xs_next_srcport(transport, port);
1761 if (port > last)
1762 nloop++;
1763 } while (err == -EADDRINUSE && nloop != 2);
1764
1765 if (myaddr.ss_family == AF_INET)
1766 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1767 &((struct sockaddr_in *)&myaddr)->sin_addr,
1768 port, err ? "failed" : "ok", err);
1769 else
1770 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1771 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1772 port, err ? "failed" : "ok", err);
1773 return err;
1774}
1775
1776/*
1777 * We don't support autobind on AF_LOCAL sockets
1778 */
1779static void xs_local_rpcbind(struct rpc_task *task)
1780{
1781 rcu_read_lock();
1782 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1783 rcu_read_unlock();
1784}
1785
1786static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1787{
1788}
1789
1790#ifdef CONFIG_DEBUG_LOCK_ALLOC
1791static struct lock_class_key xs_key[2];
1792static struct lock_class_key xs_slock_key[2];
1793
1794static inline void xs_reclassify_socketu(struct socket *sock)
1795{
1796 struct sock *sk = sock->sk;
1797
1798 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1799 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1800}
1801
1802static inline void xs_reclassify_socket4(struct socket *sock)
1803{
1804 struct sock *sk = sock->sk;
1805
1806 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1807 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1808}
1809
1810static inline void xs_reclassify_socket6(struct socket *sock)
1811{
1812 struct sock *sk = sock->sk;
1813
1814 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1815 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1816}
1817
1818static inline void xs_reclassify_socket(int family, struct socket *sock)
1819{
1820 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1821 if (sock_owned_by_user(sock->sk))
1822 return;
1823
1824 switch (family) {
1825 case AF_LOCAL:
1826 xs_reclassify_socketu(sock);
1827 break;
1828 case AF_INET:
1829 xs_reclassify_socket4(sock);
1830 break;
1831 case AF_INET6:
1832 xs_reclassify_socket6(sock);
1833 break;
1834 }
1835}
1836#else
1837static inline void xs_reclassify_socketu(struct socket *sock)
1838{
1839}
1840
1841static inline void xs_reclassify_socket4(struct socket *sock)
1842{
1843}
1844
1845static inline void xs_reclassify_socket6(struct socket *sock)
1846{
1847}
1848
1849static inline void xs_reclassify_socket(int family, struct socket *sock)
1850{
1851}
1852#endif
1853
1854static void xs_dummy_setup_socket(struct work_struct *work)
1855{
1856}
1857
1858static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1859 struct sock_xprt *transport, int family, int type, int protocol)
1860{
1861 struct socket *sock;
1862 int err;
1863
1864 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1865 if (err < 0) {
1866 dprintk("RPC: can't create %d transport socket (%d).\n",
1867 protocol, -err);
1868 goto out;
1869 }
1870 xs_reclassify_socket(family, sock);
1871
1872 err = xs_bind(transport, sock);
1873 if (err) {
1874 sock_release(sock);
1875 goto out;
1876 }
1877
1878 return sock;
1879out:
1880 return ERR_PTR(err);
1881}
1882
1883static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1884 struct socket *sock)
1885{
1886 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1887 xprt);
1888
1889 if (!transport->inet) {
1890 struct sock *sk = sock->sk;
1891
1892 write_lock_bh(&sk->sk_callback_lock);
1893
1894 xs_save_old_callbacks(transport, sk);
1895
1896 sk->sk_user_data = xprt;
1897 sk->sk_data_ready = xs_local_data_ready;
1898 sk->sk_write_space = xs_udp_write_space;
1899 sk->sk_error_report = xs_error_report;
1900 sk->sk_allocation = GFP_ATOMIC;
1901
1902 xprt_clear_connected(xprt);
1903
1904 /* Reset to new socket */
1905 transport->sock = sock;
1906 transport->inet = sk;
1907
1908 write_unlock_bh(&sk->sk_callback_lock);
1909 }
1910
1911 /* Tell the socket layer to start connecting... */
1912 xprt->stat.connect_count++;
1913 xprt->stat.connect_start = jiffies;
1914 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1915}
1916
1917/**
1918 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1919 * @xprt: RPC transport to connect
1920 * @transport: socket transport to connect
1921 * @create_sock: function to create a socket of the correct type
1922 */
1923static int xs_local_setup_socket(struct sock_xprt *transport)
1924{
1925 struct rpc_xprt *xprt = &transport->xprt;
1926 struct socket *sock;
1927 int status = -EIO;
1928
1929 current->flags |= PF_FSTRANS;
1930
1931 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1932 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1933 SOCK_STREAM, 0, &sock, 1);
1934 if (status < 0) {
1935 dprintk("RPC: can't create AF_LOCAL "
1936 "transport socket (%d).\n", -status);
1937 goto out;
1938 }
1939 xs_reclassify_socketu(sock);
1940
1941 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1942 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1943
1944 status = xs_local_finish_connecting(xprt, sock);
1945 trace_rpc_socket_connect(xprt, sock, status);
1946 switch (status) {
1947 case 0:
1948 dprintk("RPC: xprt %p connected to %s\n",
1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1950 xprt_set_connected(xprt);
1951 break;
1952 case -ENOENT:
1953 dprintk("RPC: xprt %p: socket %s does not exist\n",
1954 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1955 break;
1956 case -ECONNREFUSED:
1957 dprintk("RPC: xprt %p: connection refused for %s\n",
1958 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1959 break;
1960 default:
1961 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1962 __func__, -status,
1963 xprt->address_strings[RPC_DISPLAY_ADDR]);
1964 }
1965
1966out:
1967 xprt_clear_connecting(xprt);
1968 xprt_wake_pending_tasks(xprt, status);
1969 current->flags &= ~PF_FSTRANS;
1970 return status;
1971}
1972
1973static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1974{
1975 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1976 int ret;
1977
1978 if (RPC_IS_ASYNC(task)) {
1979 /*
1980 * We want the AF_LOCAL connect to be resolved in the
1981 * filesystem namespace of the process making the rpc
1982 * call. Thus we connect synchronously.
1983 *
1984 * If we want to support asynchronous AF_LOCAL calls,
1985 * we'll need to figure out how to pass a namespace to
1986 * connect.
1987 */
1988 rpc_exit(task, -ENOTCONN);
1989 return;
1990 }
1991 ret = xs_local_setup_socket(transport);
1992 if (ret && !RPC_IS_SOFTCONN(task))
1993 msleep_interruptible(15000);
1994}
1995
1996#ifdef CONFIG_SUNRPC_SWAP
1997static void xs_set_memalloc(struct rpc_xprt *xprt)
1998{
1999 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2000 xprt);
2001
2002 if (xprt->swapper)
2003 sk_set_memalloc(transport->inet);
2004}
2005
2006/**
2007 * xs_swapper - Tag this transport as being used for swap.
2008 * @xprt: transport to tag
2009 * @enable: enable/disable
2010 *
2011 */
2012int xs_swapper(struct rpc_xprt *xprt, int enable)
2013{
2014 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2015 xprt);
2016 int err = 0;
2017
2018 if (enable) {
2019 xprt->swapper++;
2020 xs_set_memalloc(xprt);
2021 } else if (xprt->swapper) {
2022 xprt->swapper--;
2023 sk_clear_memalloc(transport->inet);
2024 }
2025
2026 return err;
2027}
2028EXPORT_SYMBOL_GPL(xs_swapper);
2029#else
2030static void xs_set_memalloc(struct rpc_xprt *xprt)
2031{
2032}
2033#endif
2034
2035static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2036{
2037 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2038
2039 if (!transport->inet) {
2040 struct sock *sk = sock->sk;
2041
2042 write_lock_bh(&sk->sk_callback_lock);
2043
2044 xs_save_old_callbacks(transport, sk);
2045
2046 sk->sk_user_data = xprt;
2047 sk->sk_data_ready = xs_udp_data_ready;
2048 sk->sk_write_space = xs_udp_write_space;
2049 sk->sk_no_check = UDP_CSUM_NORCV;
2050 sk->sk_allocation = GFP_ATOMIC;
2051
2052 xprt_set_connected(xprt);
2053
2054 /* Reset to new socket */
2055 transport->sock = sock;
2056 transport->inet = sk;
2057
2058 xs_set_memalloc(xprt);
2059
2060 write_unlock_bh(&sk->sk_callback_lock);
2061 }
2062 xs_udp_do_set_buffer_size(xprt);
2063}
2064
2065static void xs_udp_setup_socket(struct work_struct *work)
2066{
2067 struct sock_xprt *transport =
2068 container_of(work, struct sock_xprt, connect_worker.work);
2069 struct rpc_xprt *xprt = &transport->xprt;
2070 struct socket *sock = transport->sock;
2071 int status = -EIO;
2072
2073 current->flags |= PF_FSTRANS;
2074
2075 /* Start by resetting any existing state */
2076 xs_reset_transport(transport);
2077 sock = xs_create_sock(xprt, transport,
2078 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2079 if (IS_ERR(sock))
2080 goto out;
2081
2082 dprintk("RPC: worker connecting xprt %p via %s to "
2083 "%s (port %s)\n", xprt,
2084 xprt->address_strings[RPC_DISPLAY_PROTO],
2085 xprt->address_strings[RPC_DISPLAY_ADDR],
2086 xprt->address_strings[RPC_DISPLAY_PORT]);
2087
2088 xs_udp_finish_connecting(xprt, sock);
2089 trace_rpc_socket_connect(xprt, sock, 0);
2090 status = 0;
2091out:
2092 xprt_clear_connecting(xprt);
2093 xprt_wake_pending_tasks(xprt, status);
2094 current->flags &= ~PF_FSTRANS;
2095}
2096
2097/*
2098 * We need to preserve the port number so the reply cache on the server can
2099 * find our cached RPC replies when we get around to reconnecting.
2100 */
2101static void xs_abort_connection(struct sock_xprt *transport)
2102{
2103 int result;
2104 struct sockaddr any;
2105
2106 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2107
2108 /*
2109 * Disconnect the transport socket by doing a connect operation
2110 * with AF_UNSPEC. This should return immediately...
2111 */
2112 memset(&any, 0, sizeof(any));
2113 any.sa_family = AF_UNSPEC;
2114 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2115 trace_rpc_socket_reset_connection(&transport->xprt,
2116 transport->sock, result);
2117 if (!result)
2118 xs_sock_reset_connection_flags(&transport->xprt);
2119 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
2120}
2121
2122static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2123{
2124 unsigned int state = transport->inet->sk_state;
2125
2126 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2127 /* we don't need to abort the connection if the socket
2128 * hasn't undergone a shutdown
2129 */
2130 if (transport->inet->sk_shutdown == 0)
2131 return;
2132 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2133 __func__, transport->inet->sk_shutdown);
2134 }
2135 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2136 /* we don't need to abort the connection if the socket
2137 * hasn't undergone a shutdown
2138 */
2139 if (transport->inet->sk_shutdown == 0)
2140 return;
2141 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2142 "sk_shutdown set to %d\n",
2143 __func__, transport->inet->sk_shutdown);
2144 }
2145 xs_abort_connection(transport);
2146}
2147
2148static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2149{
2150 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2151 int ret = -ENOTCONN;
2152
2153 if (!transport->inet) {
2154 struct sock *sk = sock->sk;
2155 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2156 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2157 unsigned int opt_on = 1;
2158
2159 /* TCP Keepalive options */
2160 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2161 (char *)&opt_on, sizeof(opt_on));
2162 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2163 (char *)&keepidle, sizeof(keepidle));
2164 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2165 (char *)&keepidle, sizeof(keepidle));
2166 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2167 (char *)&keepcnt, sizeof(keepcnt));
2168
2169 write_lock_bh(&sk->sk_callback_lock);
2170
2171 xs_save_old_callbacks(transport, sk);
2172
2173 sk->sk_user_data = xprt;
2174 sk->sk_data_ready = xs_tcp_data_ready;
2175 sk->sk_state_change = xs_tcp_state_change;
2176 sk->sk_write_space = xs_tcp_write_space;
2177 sk->sk_error_report = xs_error_report;
2178 sk->sk_allocation = GFP_ATOMIC;
2179
2180 /* socket options */
2181 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2182 sock_reset_flag(sk, SOCK_LINGER);
2183 tcp_sk(sk)->linger2 = 0;
2184 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2185
2186 xprt_clear_connected(xprt);
2187
2188 /* Reset to new socket */
2189 transport->sock = sock;
2190 transport->inet = sk;
2191
2192 write_unlock_bh(&sk->sk_callback_lock);
2193 }
2194
2195 if (!xprt_bound(xprt))
2196 goto out;
2197
2198 xs_set_memalloc(xprt);
2199
2200 /* Tell the socket layer to start connecting... */
2201 xprt->stat.connect_count++;
2202 xprt->stat.connect_start = jiffies;
2203 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2204 switch (ret) {
2205 case 0:
2206 case -EINPROGRESS:
2207 /* SYN_SENT! */
2208 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2209 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2210 }
2211out:
2212 return ret;
2213}
2214
2215/**
2216 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2217 * @xprt: RPC transport to connect
2218 * @transport: socket transport to connect
2219 * @create_sock: function to create a socket of the correct type
2220 *
2221 * Invoked by a work queue tasklet.
2222 */
2223static void xs_tcp_setup_socket(struct work_struct *work)
2224{
2225 struct sock_xprt *transport =
2226 container_of(work, struct sock_xprt, connect_worker.work);
2227 struct socket *sock = transport->sock;
2228 struct rpc_xprt *xprt = &transport->xprt;
2229 int status = -EIO;
2230
2231 current->flags |= PF_FSTRANS;
2232
2233 if (!sock) {
2234 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2235 sock = xs_create_sock(xprt, transport,
2236 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2237 if (IS_ERR(sock)) {
2238 status = PTR_ERR(sock);
2239 goto out;
2240 }
2241 } else {
2242 int abort_and_exit;
2243
2244 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2245 &xprt->state);
2246 /* "close" the socket, preserving the local port */
2247 xs_tcp_reuse_connection(transport);
2248
2249 if (abort_and_exit)
2250 goto out_eagain;
2251 }
2252
2253 dprintk("RPC: worker connecting xprt %p via %s to "
2254 "%s (port %s)\n", xprt,
2255 xprt->address_strings[RPC_DISPLAY_PROTO],
2256 xprt->address_strings[RPC_DISPLAY_ADDR],
2257 xprt->address_strings[RPC_DISPLAY_PORT]);
2258
2259 status = xs_tcp_finish_connecting(xprt, sock);
2260 trace_rpc_socket_connect(xprt, sock, status);
2261 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2262 xprt, -status, xprt_connected(xprt),
2263 sock->sk->sk_state);
2264 switch (status) {
2265 default:
2266 printk("%s: connect returned unhandled error %d\n",
2267 __func__, status);
2268 case -EADDRNOTAVAIL:
2269 /* We're probably in TIME_WAIT. Get rid of existing socket,
2270 * and retry
2271 */
2272 xs_tcp_force_close(xprt);
2273 break;
2274 case 0:
2275 case -EINPROGRESS:
2276 case -EALREADY:
2277 xprt_clear_connecting(xprt);
2278 current->flags &= ~PF_FSTRANS;
2279 return;
2280 case -EINVAL:
2281 /* Happens, for instance, if the user specified a link
2282 * local IPv6 address without a scope-id.
2283 */
2284 case -ECONNREFUSED:
2285 case -ECONNRESET:
2286 case -ENETUNREACH:
2287 /* retry with existing socket, after a delay */
2288 goto out;
2289 }
2290out_eagain:
2291 status = -EAGAIN;
2292out:
2293 xprt_clear_connecting(xprt);
2294 xprt_wake_pending_tasks(xprt, status);
2295 current->flags &= ~PF_FSTRANS;
2296}
2297
2298/**
2299 * xs_connect - connect a socket to a remote endpoint
2300 * @xprt: pointer to transport structure
2301 * @task: address of RPC task that manages state of connect request
2302 *
2303 * TCP: If the remote end dropped the connection, delay reconnecting.
2304 *
2305 * UDP socket connects are synchronous, but we use a work queue anyway
2306 * to guarantee that even unprivileged user processes can set up a
2307 * socket on a privileged port.
2308 *
2309 * If a UDP socket connect fails, the delay behavior here prevents
2310 * retry floods (hard mounts).
2311 */
2312static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2313{
2314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2315
2316 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2317 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2318 "seconds\n",
2319 xprt, xprt->reestablish_timeout / HZ);
2320 queue_delayed_work(rpciod_workqueue,
2321 &transport->connect_worker,
2322 xprt->reestablish_timeout);
2323 xprt->reestablish_timeout <<= 1;
2324 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2325 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2326 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2327 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2328 } else {
2329 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2330 queue_delayed_work(rpciod_workqueue,
2331 &transport->connect_worker, 0);
2332 }
2333}
2334
2335/**
2336 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2337 * @xprt: rpc_xprt struct containing statistics
2338 * @seq: output file
2339 *
2340 */
2341static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2342{
2343 long idle_time = 0;
2344
2345 if (xprt_connected(xprt))
2346 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2347
2348 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2349 "%llu %llu %lu %llu %llu\n",
2350 xprt->stat.bind_count,
2351 xprt->stat.connect_count,
2352 xprt->stat.connect_time,
2353 idle_time,
2354 xprt->stat.sends,
2355 xprt->stat.recvs,
2356 xprt->stat.bad_xids,
2357 xprt->stat.req_u,
2358 xprt->stat.bklog_u,
2359 xprt->stat.max_slots,
2360 xprt->stat.sending_u,
2361 xprt->stat.pending_u);
2362}
2363
2364/**
2365 * xs_udp_print_stats - display UDP socket-specifc stats
2366 * @xprt: rpc_xprt struct containing statistics
2367 * @seq: output file
2368 *
2369 */
2370static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2371{
2372 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2373
2374 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2375 "%lu %llu %llu\n",
2376 transport->srcport,
2377 xprt->stat.bind_count,
2378 xprt->stat.sends,
2379 xprt->stat.recvs,
2380 xprt->stat.bad_xids,
2381 xprt->stat.req_u,
2382 xprt->stat.bklog_u,
2383 xprt->stat.max_slots,
2384 xprt->stat.sending_u,
2385 xprt->stat.pending_u);
2386}
2387
2388/**
2389 * xs_tcp_print_stats - display TCP socket-specifc stats
2390 * @xprt: rpc_xprt struct containing statistics
2391 * @seq: output file
2392 *
2393 */
2394static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2395{
2396 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2397 long idle_time = 0;
2398
2399 if (xprt_connected(xprt))
2400 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2401
2402 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2403 "%llu %llu %lu %llu %llu\n",
2404 transport->srcport,
2405 xprt->stat.bind_count,
2406 xprt->stat.connect_count,
2407 xprt->stat.connect_time,
2408 idle_time,
2409 xprt->stat.sends,
2410 xprt->stat.recvs,
2411 xprt->stat.bad_xids,
2412 xprt->stat.req_u,
2413 xprt->stat.bklog_u,
2414 xprt->stat.max_slots,
2415 xprt->stat.sending_u,
2416 xprt->stat.pending_u);
2417}
2418
2419/*
2420 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2421 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2422 * to use the server side send routines.
2423 */
2424static void *bc_malloc(struct rpc_task *task, size_t size)
2425{
2426 struct page *page;
2427 struct rpc_buffer *buf;
2428
2429 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2430 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2431 return NULL;
2432
2433 page = alloc_page(GFP_KERNEL);
2434 if (!page)
2435 return NULL;
2436
2437 buf = page_address(page);
2438 buf->len = PAGE_SIZE;
2439
2440 return buf->data;
2441}
2442
2443/*
2444 * Free the space allocated in the bc_alloc routine
2445 */
2446static void bc_free(void *buffer)
2447{
2448 struct rpc_buffer *buf;
2449
2450 if (!buffer)
2451 return;
2452
2453 buf = container_of(buffer, struct rpc_buffer, data);
2454 free_page((unsigned long)buf);
2455}
2456
2457/*
2458 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2459 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2460 */
2461static int bc_sendto(struct rpc_rqst *req)
2462{
2463 int len;
2464 struct xdr_buf *xbufp = &req->rq_snd_buf;
2465 struct rpc_xprt *xprt = req->rq_xprt;
2466 struct sock_xprt *transport =
2467 container_of(xprt, struct sock_xprt, xprt);
2468 struct socket *sock = transport->sock;
2469 unsigned long headoff;
2470 unsigned long tailoff;
2471
2472 xs_encode_stream_record_marker(xbufp);
2473
2474 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2475 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2476 len = svc_send_common(sock, xbufp,
2477 virt_to_page(xbufp->head[0].iov_base), headoff,
2478 xbufp->tail[0].iov_base, tailoff);
2479
2480 if (len != xbufp->len) {
2481 printk(KERN_NOTICE "Error sending entire callback!\n");
2482 len = -EAGAIN;
2483 }
2484
2485 return len;
2486}
2487
2488/*
2489 * The send routine. Borrows from svc_send
2490 */
2491static int bc_send_request(struct rpc_task *task)
2492{
2493 struct rpc_rqst *req = task->tk_rqstp;
2494 struct svc_xprt *xprt;
2495 u32 len;
2496
2497 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2498 /*
2499 * Get the server socket associated with this callback xprt
2500 */
2501 xprt = req->rq_xprt->bc_xprt;
2502
2503 /*
2504 * Grab the mutex to serialize data as the connection is shared
2505 * with the fore channel
2506 */
2507 if (!mutex_trylock(&xprt->xpt_mutex)) {
2508 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2509 if (!mutex_trylock(&xprt->xpt_mutex))
2510 return -EAGAIN;
2511 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2512 }
2513 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2514 len = -ENOTCONN;
2515 else
2516 len = bc_sendto(req);
2517 mutex_unlock(&xprt->xpt_mutex);
2518
2519 if (len > 0)
2520 len = 0;
2521
2522 return len;
2523}
2524
2525/*
2526 * The close routine. Since this is client initiated, we do nothing
2527 */
2528
2529static void bc_close(struct rpc_xprt *xprt)
2530{
2531}
2532
2533/*
2534 * The xprt destroy routine. Again, because this connection is client
2535 * initiated, we do nothing
2536 */
2537
2538static void bc_destroy(struct rpc_xprt *xprt)
2539{
2540 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2541
2542 xs_xprt_free(xprt);
2543 module_put(THIS_MODULE);
2544}
2545
2546static struct rpc_xprt_ops xs_local_ops = {
2547 .reserve_xprt = xprt_reserve_xprt,
2548 .release_xprt = xs_tcp_release_xprt,
2549 .alloc_slot = xprt_alloc_slot,
2550 .rpcbind = xs_local_rpcbind,
2551 .set_port = xs_local_set_port,
2552 .connect = xs_local_connect,
2553 .buf_alloc = rpc_malloc,
2554 .buf_free = rpc_free,
2555 .send_request = xs_local_send_request,
2556 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2557 .close = xs_close,
2558 .destroy = xs_destroy,
2559 .print_stats = xs_local_print_stats,
2560};
2561
2562static struct rpc_xprt_ops xs_udp_ops = {
2563 .set_buffer_size = xs_udp_set_buffer_size,
2564 .reserve_xprt = xprt_reserve_xprt_cong,
2565 .release_xprt = xprt_release_xprt_cong,
2566 .alloc_slot = xprt_alloc_slot,
2567 .rpcbind = rpcb_getport_async,
2568 .set_port = xs_set_port,
2569 .connect = xs_connect,
2570 .buf_alloc = rpc_malloc,
2571 .buf_free = rpc_free,
2572 .send_request = xs_udp_send_request,
2573 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2574 .timer = xs_udp_timer,
2575 .release_request = xprt_release_rqst_cong,
2576 .close = xs_close,
2577 .destroy = xs_destroy,
2578 .print_stats = xs_udp_print_stats,
2579};
2580
2581static struct rpc_xprt_ops xs_tcp_ops = {
2582 .reserve_xprt = xprt_reserve_xprt,
2583 .release_xprt = xs_tcp_release_xprt,
2584 .alloc_slot = xprt_lock_and_alloc_slot,
2585 .rpcbind = rpcb_getport_async,
2586 .set_port = xs_set_port,
2587 .connect = xs_connect,
2588 .buf_alloc = rpc_malloc,
2589 .buf_free = rpc_free,
2590 .send_request = xs_tcp_send_request,
2591 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2592 .close = xs_tcp_close,
2593 .destroy = xs_destroy,
2594 .print_stats = xs_tcp_print_stats,
2595};
2596
2597/*
2598 * The rpc_xprt_ops for the server backchannel
2599 */
2600
2601static struct rpc_xprt_ops bc_tcp_ops = {
2602 .reserve_xprt = xprt_reserve_xprt,
2603 .release_xprt = xprt_release_xprt,
2604 .alloc_slot = xprt_alloc_slot,
2605 .buf_alloc = bc_malloc,
2606 .buf_free = bc_free,
2607 .send_request = bc_send_request,
2608 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2609 .close = bc_close,
2610 .destroy = bc_destroy,
2611 .print_stats = xs_tcp_print_stats,
2612};
2613
2614static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2615{
2616 static const struct sockaddr_in sin = {
2617 .sin_family = AF_INET,
2618 .sin_addr.s_addr = htonl(INADDR_ANY),
2619 };
2620 static const struct sockaddr_in6 sin6 = {
2621 .sin6_family = AF_INET6,
2622 .sin6_addr = IN6ADDR_ANY_INIT,
2623 };
2624
2625 switch (family) {
2626 case AF_LOCAL:
2627 break;
2628 case AF_INET:
2629 memcpy(sap, &sin, sizeof(sin));
2630 break;
2631 case AF_INET6:
2632 memcpy(sap, &sin6, sizeof(sin6));
2633 break;
2634 default:
2635 dprintk("RPC: %s: Bad address family\n", __func__);
2636 return -EAFNOSUPPORT;
2637 }
2638 return 0;
2639}
2640
2641static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2642 unsigned int slot_table_size,
2643 unsigned int max_slot_table_size)
2644{
2645 struct rpc_xprt *xprt;
2646 struct sock_xprt *new;
2647
2648 if (args->addrlen > sizeof(xprt->addr)) {
2649 dprintk("RPC: xs_setup_xprt: address too large\n");
2650 return ERR_PTR(-EBADF);
2651 }
2652
2653 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2654 max_slot_table_size);
2655 if (xprt == NULL) {
2656 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2657 "rpc_xprt\n");
2658 return ERR_PTR(-ENOMEM);
2659 }
2660
2661 new = container_of(xprt, struct sock_xprt, xprt);
2662 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2663 xprt->addrlen = args->addrlen;
2664 if (args->srcaddr)
2665 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2666 else {
2667 int err;
2668 err = xs_init_anyaddr(args->dstaddr->sa_family,
2669 (struct sockaddr *)&new->srcaddr);
2670 if (err != 0) {
2671 xprt_free(xprt);
2672 return ERR_PTR(err);
2673 }
2674 }
2675
2676 return xprt;
2677}
2678
2679static const struct rpc_timeout xs_local_default_timeout = {
2680 .to_initval = 10 * HZ,
2681 .to_maxval = 10 * HZ,
2682 .to_retries = 2,
2683};
2684
2685/**
2686 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2687 * @args: rpc transport creation arguments
2688 *
2689 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2690 */
2691static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2692{
2693 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2694 struct sock_xprt *transport;
2695 struct rpc_xprt *xprt;
2696 struct rpc_xprt *ret;
2697
2698 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2699 xprt_max_tcp_slot_table_entries);
2700 if (IS_ERR(xprt))
2701 return xprt;
2702 transport = container_of(xprt, struct sock_xprt, xprt);
2703
2704 xprt->prot = 0;
2705 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2706 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2707
2708 xprt->bind_timeout = XS_BIND_TO;
2709 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2710 xprt->idle_timeout = XS_IDLE_DISC_TO;
2711
2712 xprt->ops = &xs_local_ops;
2713 xprt->timeout = &xs_local_default_timeout;
2714
2715 INIT_DELAYED_WORK(&transport->connect_worker,
2716 xs_dummy_setup_socket);
2717
2718 switch (sun->sun_family) {
2719 case AF_LOCAL:
2720 if (sun->sun_path[0] != '/') {
2721 dprintk("RPC: bad AF_LOCAL address: %s\n",
2722 sun->sun_path);
2723 ret = ERR_PTR(-EINVAL);
2724 goto out_err;
2725 }
2726 xprt_set_bound(xprt);
2727 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2728 ret = ERR_PTR(xs_local_setup_socket(transport));
2729 if (ret)
2730 goto out_err;
2731 break;
2732 default:
2733 ret = ERR_PTR(-EAFNOSUPPORT);
2734 goto out_err;
2735 }
2736
2737 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2738 xprt->address_strings[RPC_DISPLAY_ADDR]);
2739
2740 if (try_module_get(THIS_MODULE))
2741 return xprt;
2742 ret = ERR_PTR(-EINVAL);
2743out_err:
2744 xs_xprt_free(xprt);
2745 return ret;
2746}
2747
2748static const struct rpc_timeout xs_udp_default_timeout = {
2749 .to_initval = 5 * HZ,
2750 .to_maxval = 30 * HZ,
2751 .to_increment = 5 * HZ,
2752 .to_retries = 5,
2753};
2754
2755/**
2756 * xs_setup_udp - Set up transport to use a UDP socket
2757 * @args: rpc transport creation arguments
2758 *
2759 */
2760static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2761{
2762 struct sockaddr *addr = args->dstaddr;
2763 struct rpc_xprt *xprt;
2764 struct sock_xprt *transport;
2765 struct rpc_xprt *ret;
2766
2767 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2768 xprt_udp_slot_table_entries);
2769 if (IS_ERR(xprt))
2770 return xprt;
2771 transport = container_of(xprt, struct sock_xprt, xprt);
2772
2773 xprt->prot = IPPROTO_UDP;
2774 xprt->tsh_size = 0;
2775 /* XXX: header size can vary due to auth type, IPv6, etc. */
2776 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2777
2778 xprt->bind_timeout = XS_BIND_TO;
2779 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2780 xprt->idle_timeout = XS_IDLE_DISC_TO;
2781
2782 xprt->ops = &xs_udp_ops;
2783
2784 xprt->timeout = &xs_udp_default_timeout;
2785
2786 switch (addr->sa_family) {
2787 case AF_INET:
2788 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2789 xprt_set_bound(xprt);
2790
2791 INIT_DELAYED_WORK(&transport->connect_worker,
2792 xs_udp_setup_socket);
2793 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2794 break;
2795 case AF_INET6:
2796 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2797 xprt_set_bound(xprt);
2798
2799 INIT_DELAYED_WORK(&transport->connect_worker,
2800 xs_udp_setup_socket);
2801 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2802 break;
2803 default:
2804 ret = ERR_PTR(-EAFNOSUPPORT);
2805 goto out_err;
2806 }
2807
2808 if (xprt_bound(xprt))
2809 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2810 xprt->address_strings[RPC_DISPLAY_ADDR],
2811 xprt->address_strings[RPC_DISPLAY_PORT],
2812 xprt->address_strings[RPC_DISPLAY_PROTO]);
2813 else
2814 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2815 xprt->address_strings[RPC_DISPLAY_ADDR],
2816 xprt->address_strings[RPC_DISPLAY_PROTO]);
2817
2818 if (try_module_get(THIS_MODULE))
2819 return xprt;
2820 ret = ERR_PTR(-EINVAL);
2821out_err:
2822 xs_xprt_free(xprt);
2823 return ret;
2824}
2825
2826static const struct rpc_timeout xs_tcp_default_timeout = {
2827 .to_initval = 60 * HZ,
2828 .to_maxval = 60 * HZ,
2829 .to_retries = 2,
2830};
2831
2832/**
2833 * xs_setup_tcp - Set up transport to use a TCP socket
2834 * @args: rpc transport creation arguments
2835 *
2836 */
2837static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2838{
2839 struct sockaddr *addr = args->dstaddr;
2840 struct rpc_xprt *xprt;
2841 struct sock_xprt *transport;
2842 struct rpc_xprt *ret;
2843 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2844
2845 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2846 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2847
2848 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2849 max_slot_table_size);
2850 if (IS_ERR(xprt))
2851 return xprt;
2852 transport = container_of(xprt, struct sock_xprt, xprt);
2853
2854 xprt->prot = IPPROTO_TCP;
2855 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2856 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2857
2858 xprt->bind_timeout = XS_BIND_TO;
2859 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2860 xprt->idle_timeout = XS_IDLE_DISC_TO;
2861
2862 xprt->ops = &xs_tcp_ops;
2863 xprt->timeout = &xs_tcp_default_timeout;
2864
2865 switch (addr->sa_family) {
2866 case AF_INET:
2867 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2868 xprt_set_bound(xprt);
2869
2870 INIT_DELAYED_WORK(&transport->connect_worker,
2871 xs_tcp_setup_socket);
2872 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2873 break;
2874 case AF_INET6:
2875 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2876 xprt_set_bound(xprt);
2877
2878 INIT_DELAYED_WORK(&transport->connect_worker,
2879 xs_tcp_setup_socket);
2880 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2881 break;
2882 default:
2883 ret = ERR_PTR(-EAFNOSUPPORT);
2884 goto out_err;
2885 }
2886
2887 if (xprt_bound(xprt))
2888 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2889 xprt->address_strings[RPC_DISPLAY_ADDR],
2890 xprt->address_strings[RPC_DISPLAY_PORT],
2891 xprt->address_strings[RPC_DISPLAY_PROTO]);
2892 else
2893 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2894 xprt->address_strings[RPC_DISPLAY_ADDR],
2895 xprt->address_strings[RPC_DISPLAY_PROTO]);
2896
2897 if (try_module_get(THIS_MODULE))
2898 return xprt;
2899 ret = ERR_PTR(-EINVAL);
2900out_err:
2901 xs_xprt_free(xprt);
2902 return ret;
2903}
2904
2905/**
2906 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2907 * @args: rpc transport creation arguments
2908 *
2909 */
2910static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2911{
2912 struct sockaddr *addr = args->dstaddr;
2913 struct rpc_xprt *xprt;
2914 struct sock_xprt *transport;
2915 struct svc_sock *bc_sock;
2916 struct rpc_xprt *ret;
2917
2918 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2919 xprt_tcp_slot_table_entries);
2920 if (IS_ERR(xprt))
2921 return xprt;
2922 transport = container_of(xprt, struct sock_xprt, xprt);
2923
2924 xprt->prot = IPPROTO_TCP;
2925 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2926 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2927 xprt->timeout = &xs_tcp_default_timeout;
2928
2929 /* backchannel */
2930 xprt_set_bound(xprt);
2931 xprt->bind_timeout = 0;
2932 xprt->reestablish_timeout = 0;
2933 xprt->idle_timeout = 0;
2934
2935 xprt->ops = &bc_tcp_ops;
2936
2937 switch (addr->sa_family) {
2938 case AF_INET:
2939 xs_format_peer_addresses(xprt, "tcp",
2940 RPCBIND_NETID_TCP);
2941 break;
2942 case AF_INET6:
2943 xs_format_peer_addresses(xprt, "tcp",
2944 RPCBIND_NETID_TCP6);
2945 break;
2946 default:
2947 ret = ERR_PTR(-EAFNOSUPPORT);
2948 goto out_err;
2949 }
2950
2951 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2952 xprt->address_strings[RPC_DISPLAY_ADDR],
2953 xprt->address_strings[RPC_DISPLAY_PORT],
2954 xprt->address_strings[RPC_DISPLAY_PROTO]);
2955
2956 /*
2957 * Once we've associated a backchannel xprt with a connection,
2958 * we want to keep it around as long as the connection lasts,
2959 * in case we need to start using it for a backchannel again;
2960 * this reference won't be dropped until bc_xprt is destroyed.
2961 */
2962 xprt_get(xprt);
2963 args->bc_xprt->xpt_bc_xprt = xprt;
2964 xprt->bc_xprt = args->bc_xprt;
2965 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2966 transport->sock = bc_sock->sk_sock;
2967 transport->inet = bc_sock->sk_sk;
2968
2969 /*
2970 * Since we don't want connections for the backchannel, we set
2971 * the xprt status to connected
2972 */
2973 xprt_set_connected(xprt);
2974
2975 if (try_module_get(THIS_MODULE))
2976 return xprt;
2977
2978 args->bc_xprt->xpt_bc_xprt = NULL;
2979 xprt_put(xprt);
2980 ret = ERR_PTR(-EINVAL);
2981out_err:
2982 xs_xprt_free(xprt);
2983 return ret;
2984}
2985
2986static struct xprt_class xs_local_transport = {
2987 .list = LIST_HEAD_INIT(xs_local_transport.list),
2988 .name = "named UNIX socket",
2989 .owner = THIS_MODULE,
2990 .ident = XPRT_TRANSPORT_LOCAL,
2991 .setup = xs_setup_local,
2992};
2993
2994static struct xprt_class xs_udp_transport = {
2995 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2996 .name = "udp",
2997 .owner = THIS_MODULE,
2998 .ident = XPRT_TRANSPORT_UDP,
2999 .setup = xs_setup_udp,
3000};
3001
3002static struct xprt_class xs_tcp_transport = {
3003 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3004 .name = "tcp",
3005 .owner = THIS_MODULE,
3006 .ident = XPRT_TRANSPORT_TCP,
3007 .setup = xs_setup_tcp,
3008};
3009
3010static struct xprt_class xs_bc_tcp_transport = {
3011 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3012 .name = "tcp NFSv4.1 backchannel",
3013 .owner = THIS_MODULE,
3014 .ident = XPRT_TRANSPORT_BC_TCP,
3015 .setup = xs_setup_bc_tcp,
3016};
3017
3018/**
3019 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3020 *
3021 */
3022int init_socket_xprt(void)
3023{
3024#ifdef RPC_DEBUG
3025 if (!sunrpc_table_header)
3026 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3027#endif
3028
3029 xprt_register_transport(&xs_local_transport);
3030 xprt_register_transport(&xs_udp_transport);
3031 xprt_register_transport(&xs_tcp_transport);
3032 xprt_register_transport(&xs_bc_tcp_transport);
3033
3034 return 0;
3035}
3036
3037/**
3038 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3039 *
3040 */
3041void cleanup_socket_xprt(void)
3042{
3043#ifdef RPC_DEBUG
3044 if (sunrpc_table_header) {
3045 unregister_sysctl_table(sunrpc_table_header);
3046 sunrpc_table_header = NULL;
3047 }
3048#endif
3049
3050 xprt_unregister_transport(&xs_local_transport);
3051 xprt_unregister_transport(&xs_udp_transport);
3052 xprt_unregister_transport(&xs_tcp_transport);
3053 xprt_unregister_transport(&xs_bc_tcp_transport);
3054}
3055
3056static int param_set_uint_minmax(const char *val,
3057 const struct kernel_param *kp,
3058 unsigned int min, unsigned int max)
3059{
3060 unsigned long num;
3061 int ret;
3062
3063 if (!val)
3064 return -EINVAL;
3065 ret = strict_strtoul(val, 0, &num);
3066 if (ret == -EINVAL || num < min || num > max)
3067 return -EINVAL;
3068 *((unsigned int *)kp->arg) = num;
3069 return 0;
3070}
3071
3072static int param_set_portnr(const char *val, const struct kernel_param *kp)
3073{
3074 return param_set_uint_minmax(val, kp,
3075 RPC_MIN_RESVPORT,
3076 RPC_MAX_RESVPORT);
3077}
3078
3079static struct kernel_param_ops param_ops_portnr = {
3080 .set = param_set_portnr,
3081 .get = param_get_uint,
3082};
3083
3084#define param_check_portnr(name, p) \
3085 __param_check(name, p, unsigned int);
3086
3087module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3088module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3089
3090static int param_set_slot_table_size(const char *val,
3091 const struct kernel_param *kp)
3092{
3093 return param_set_uint_minmax(val, kp,
3094 RPC_MIN_SLOT_TABLE,
3095 RPC_MAX_SLOT_TABLE);
3096}
3097
3098static struct kernel_param_ops param_ops_slot_table_size = {
3099 .set = param_set_slot_table_size,
3100 .get = param_get_uint,
3101};
3102
3103#define param_check_slot_table_size(name, p) \
3104 __param_check(name, p, unsigned int);
3105
3106static int param_set_max_slot_table_size(const char *val,
3107 const struct kernel_param *kp)
3108{
3109 return param_set_uint_minmax(val, kp,
3110 RPC_MIN_SLOT_TABLE,
3111 RPC_MAX_SLOT_TABLE_LIMIT);
3112}
3113
3114static struct kernel_param_ops param_ops_max_slot_table_size = {
3115 .set = param_set_max_slot_table_size,
3116 .get = param_get_uint,
3117};
3118
3119#define param_check_max_slot_table_size(name, p) \
3120 __param_check(name, p, unsigned int);
3121
3122module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3123 slot_table_size, 0644);
3124module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3125 max_slot_table_size, 0644);
3126module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3127 slot_table_size, 0644);
3128