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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 <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "sunrpc.h"
58
59static void xs_close(struct rpc_xprt *xprt);
60static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
61 struct socket *sock);
62
63/*
64 * xprtsock tunables
65 */
66static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
67static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
68static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
69
70static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
71static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
72
73#define XS_TCP_LINGER_TO (15U * HZ)
74static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
75
76/*
77 * We can register our own files under /proc/sys/sunrpc by
78 * calling register_sysctl_table() again. The files in that
79 * directory become the union of all files registered there.
80 *
81 * We simply need to make sure that we don't collide with
82 * someone else's file names!
83 */
84
85static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
86static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
87static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
88static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
89static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
90
91static struct ctl_table_header *sunrpc_table_header;
92
93/*
94 * FIXME: changing the UDP slot table size should also resize the UDP
95 * socket buffers for existing UDP transports
96 */
97static struct ctl_table xs_tunables_table[] = {
98 {
99 .procname = "udp_slot_table_entries",
100 .data = &xprt_udp_slot_table_entries,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = proc_dointvec_minmax,
104 .extra1 = &min_slot_table_size,
105 .extra2 = &max_slot_table_size
106 },
107 {
108 .procname = "tcp_slot_table_entries",
109 .data = &xprt_tcp_slot_table_entries,
110 .maxlen = sizeof(unsigned int),
111 .mode = 0644,
112 .proc_handler = proc_dointvec_minmax,
113 .extra1 = &min_slot_table_size,
114 .extra2 = &max_slot_table_size
115 },
116 {
117 .procname = "tcp_max_slot_table_entries",
118 .data = &xprt_max_tcp_slot_table_entries,
119 .maxlen = sizeof(unsigned int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = &min_slot_table_size,
123 .extra2 = &max_tcp_slot_table_limit
124 },
125 {
126 .procname = "min_resvport",
127 .data = &xprt_min_resvport,
128 .maxlen = sizeof(unsigned int),
129 .mode = 0644,
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &xprt_min_resvport_limit,
132 .extra2 = &xprt_max_resvport_limit
133 },
134 {
135 .procname = "max_resvport",
136 .data = &xprt_max_resvport,
137 .maxlen = sizeof(unsigned int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = &xprt_min_resvport_limit,
141 .extra2 = &xprt_max_resvport_limit
142 },
143 {
144 .procname = "tcp_fin_timeout",
145 .data = &xs_tcp_fin_timeout,
146 .maxlen = sizeof(xs_tcp_fin_timeout),
147 .mode = 0644,
148 .proc_handler = proc_dointvec_jiffies,
149 },
150 { },
151};
152
153static struct ctl_table sunrpc_table[] = {
154 {
155 .procname = "sunrpc",
156 .mode = 0555,
157 .child = xs_tunables_table
158 },
159 { },
160};
161
162/*
163 * Wait duration for a reply from the RPC portmapper.
164 */
165#define XS_BIND_TO (60U * HZ)
166
167/*
168 * Delay if a UDP socket connect error occurs. This is most likely some
169 * kind of resource problem on the local host.
170 */
171#define XS_UDP_REEST_TO (2U * HZ)
172
173/*
174 * The reestablish timeout allows clients to delay for a bit before attempting
175 * to reconnect to a server that just dropped our connection.
176 *
177 * We implement an exponential backoff when trying to reestablish a TCP
178 * transport connection with the server. Some servers like to drop a TCP
179 * connection when they are overworked, so we start with a short timeout and
180 * increase over time if the server is down or not responding.
181 */
182#define XS_TCP_INIT_REEST_TO (3U * HZ)
183
184/*
185 * TCP idle timeout; client drops the transport socket if it is idle
186 * for this long. Note that we also timeout UDP sockets to prevent
187 * holding port numbers when there is no RPC traffic.
188 */
189#define XS_IDLE_DISC_TO (5U * 60 * HZ)
190
191#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
192# undef RPC_DEBUG_DATA
193# define RPCDBG_FACILITY RPCDBG_TRANS
194#endif
195
196#ifdef RPC_DEBUG_DATA
197static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
198{
199 u8 *buf = (u8 *) packet;
200 int j;
201
202 dprintk("RPC: %s\n", msg);
203 for (j = 0; j < count && j < 128; j += 4) {
204 if (!(j & 31)) {
205 if (j)
206 dprintk("\n");
207 dprintk("0x%04x ", j);
208 }
209 dprintk("%02x%02x%02x%02x ",
210 buf[j], buf[j+1], buf[j+2], buf[j+3]);
211 }
212 dprintk("\n");
213}
214#else
215static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
216{
217 /* NOP */
218}
219#endif
220
221static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
222{
223 return (struct rpc_xprt *) sk->sk_user_data;
224}
225
226static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
227{
228 return (struct sockaddr *) &xprt->addr;
229}
230
231static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
232{
233 return (struct sockaddr_un *) &xprt->addr;
234}
235
236static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
237{
238 return (struct sockaddr_in *) &xprt->addr;
239}
240
241static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
242{
243 return (struct sockaddr_in6 *) &xprt->addr;
244}
245
246static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
247{
248 struct sockaddr *sap = xs_addr(xprt);
249 struct sockaddr_in6 *sin6;
250 struct sockaddr_in *sin;
251 struct sockaddr_un *sun;
252 char buf[128];
253
254 switch (sap->sa_family) {
255 case AF_LOCAL:
256 sun = xs_addr_un(xprt);
257 strlcpy(buf, sun->sun_path, sizeof(buf));
258 xprt->address_strings[RPC_DISPLAY_ADDR] =
259 kstrdup(buf, GFP_KERNEL);
260 break;
261 case AF_INET:
262 (void)rpc_ntop(sap, buf, sizeof(buf));
263 xprt->address_strings[RPC_DISPLAY_ADDR] =
264 kstrdup(buf, GFP_KERNEL);
265 sin = xs_addr_in(xprt);
266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
267 break;
268 case AF_INET6:
269 (void)rpc_ntop(sap, buf, sizeof(buf));
270 xprt->address_strings[RPC_DISPLAY_ADDR] =
271 kstrdup(buf, GFP_KERNEL);
272 sin6 = xs_addr_in6(xprt);
273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
274 break;
275 default:
276 BUG();
277 }
278
279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
280}
281
282static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
283{
284 struct sockaddr *sap = xs_addr(xprt);
285 char buf[128];
286
287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
289
290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
292}
293
294static void xs_format_peer_addresses(struct rpc_xprt *xprt,
295 const char *protocol,
296 const char *netid)
297{
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
300 xs_format_common_peer_addresses(xprt);
301 xs_format_common_peer_ports(xprt);
302}
303
304static void xs_update_peer_port(struct rpc_xprt *xprt)
305{
306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
308
309 xs_format_common_peer_ports(xprt);
310}
311
312static void xs_free_peer_addresses(struct rpc_xprt *xprt)
313{
314 unsigned int i;
315
316 for (i = 0; i < RPC_DISPLAY_MAX; i++)
317 switch (i) {
318 case RPC_DISPLAY_PROTO:
319 case RPC_DISPLAY_NETID:
320 continue;
321 default:
322 kfree(xprt->address_strings[i]);
323 }
324}
325
326static size_t
327xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
328{
329 size_t i,n;
330
331 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
332 return want;
333 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
334 for (i = 0; i < n; i++) {
335 if (buf->pages[i])
336 continue;
337 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
338 if (!buf->pages[i]) {
339 i *= PAGE_SIZE;
340 return i > buf->page_base ? i - buf->page_base : 0;
341 }
342 }
343 return want;
344}
345
346static ssize_t
347xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
348{
349 ssize_t ret;
350 if (seek != 0)
351 iov_iter_advance(&msg->msg_iter, seek);
352 ret = sock_recvmsg(sock, msg, flags);
353 return ret > 0 ? ret + seek : ret;
354}
355
356static ssize_t
357xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
358 struct kvec *kvec, size_t count, size_t seek)
359{
360 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
361 return xs_sock_recvmsg(sock, msg, flags, seek);
362}
363
364static ssize_t
365xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
366 struct bio_vec *bvec, unsigned long nr, size_t count,
367 size_t seek)
368{
369 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
370 return xs_sock_recvmsg(sock, msg, flags, seek);
371}
372
373static ssize_t
374xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
375 size_t count)
376{
377 iov_iter_discard(&msg->msg_iter, READ, count);
378 return sock_recvmsg(sock, msg, flags);
379}
380
381#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
382static void
383xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
384{
385 struct bvec_iter bi = {
386 .bi_size = count,
387 };
388 struct bio_vec bv;
389
390 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
391 for_each_bvec(bv, bvec, bi, bi)
392 flush_dcache_page(bv.bv_page);
393}
394#else
395static inline void
396xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
397{
398}
399#endif
400
401static ssize_t
402xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
403 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
404{
405 size_t want, seek_init = seek, offset = 0;
406 ssize_t ret;
407
408 want = min_t(size_t, count, buf->head[0].iov_len);
409 if (seek < want) {
410 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
411 if (ret <= 0)
412 goto sock_err;
413 offset += ret;
414 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
415 goto out;
416 if (ret != want)
417 goto out;
418 seek = 0;
419 } else {
420 seek -= want;
421 offset += want;
422 }
423
424 want = xs_alloc_sparse_pages(buf,
425 min_t(size_t, count - offset, buf->page_len),
426 GFP_KERNEL);
427 if (seek < want) {
428 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
429 xdr_buf_pagecount(buf),
430 want + buf->page_base,
431 seek + buf->page_base);
432 if (ret <= 0)
433 goto sock_err;
434 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
435 offset += ret - buf->page_base;
436 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
437 goto out;
438 if (ret != want)
439 goto out;
440 seek = 0;
441 } else {
442 seek -= want;
443 offset += want;
444 }
445
446 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
447 if (seek < want) {
448 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
449 if (ret <= 0)
450 goto sock_err;
451 offset += ret;
452 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
453 goto out;
454 if (ret != want)
455 goto out;
456 } else if (offset < seek_init)
457 offset = seek_init;
458 ret = -EMSGSIZE;
459out:
460 *read = offset - seek_init;
461 return ret;
462sock_err:
463 offset += seek;
464 goto out;
465}
466
467static void
468xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
469{
470 if (!transport->recv.copied) {
471 if (buf->head[0].iov_len >= transport->recv.offset)
472 memcpy(buf->head[0].iov_base,
473 &transport->recv.xid,
474 transport->recv.offset);
475 transport->recv.copied = transport->recv.offset;
476 }
477}
478
479static bool
480xs_read_stream_request_done(struct sock_xprt *transport)
481{
482 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
483}
484
485static void
486xs_read_stream_check_eor(struct sock_xprt *transport,
487 struct msghdr *msg)
488{
489 if (xs_read_stream_request_done(transport))
490 msg->msg_flags |= MSG_EOR;
491}
492
493static ssize_t
494xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
495 int flags, struct rpc_rqst *req)
496{
497 struct xdr_buf *buf = &req->rq_private_buf;
498 size_t want, uninitialized_var(read);
499 ssize_t uninitialized_var(ret);
500
501 xs_read_header(transport, buf);
502
503 want = transport->recv.len - transport->recv.offset;
504 if (want != 0) {
505 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
506 transport->recv.copied + want,
507 transport->recv.copied,
508 &read);
509 transport->recv.offset += read;
510 transport->recv.copied += read;
511 }
512
513 if (transport->recv.offset == transport->recv.len)
514 xs_read_stream_check_eor(transport, msg);
515
516 if (want == 0)
517 return 0;
518
519 switch (ret) {
520 default:
521 break;
522 case -EFAULT:
523 case -EMSGSIZE:
524 msg->msg_flags |= MSG_TRUNC;
525 return read;
526 case 0:
527 return -ESHUTDOWN;
528 }
529 return ret < 0 ? ret : read;
530}
531
532static size_t
533xs_read_stream_headersize(bool isfrag)
534{
535 if (isfrag)
536 return sizeof(__be32);
537 return 3 * sizeof(__be32);
538}
539
540static ssize_t
541xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
542 int flags, size_t want, size_t seek)
543{
544 struct kvec kvec = {
545 .iov_base = &transport->recv.fraghdr,
546 .iov_len = want,
547 };
548 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
549}
550
551#if defined(CONFIG_SUNRPC_BACKCHANNEL)
552static ssize_t
553xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
554{
555 struct rpc_xprt *xprt = &transport->xprt;
556 struct rpc_rqst *req;
557 ssize_t ret;
558
559 /* Look up and lock the request corresponding to the given XID */
560 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
561 if (!req) {
562 printk(KERN_WARNING "Callback slot table overflowed\n");
563 return -ESHUTDOWN;
564 }
565 if (transport->recv.copied && !req->rq_private_buf.len)
566 return -ESHUTDOWN;
567
568 ret = xs_read_stream_request(transport, msg, flags, req);
569 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
570 xprt_complete_bc_request(req, transport->recv.copied);
571 else
572 req->rq_private_buf.len = transport->recv.copied;
573
574 return ret;
575}
576#else /* CONFIG_SUNRPC_BACKCHANNEL */
577static ssize_t
578xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
579{
580 return -ESHUTDOWN;
581}
582#endif /* CONFIG_SUNRPC_BACKCHANNEL */
583
584static ssize_t
585xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
586{
587 struct rpc_xprt *xprt = &transport->xprt;
588 struct rpc_rqst *req;
589 ssize_t ret = 0;
590
591 /* Look up and lock the request corresponding to the given XID */
592 spin_lock(&xprt->queue_lock);
593 req = xprt_lookup_rqst(xprt, transport->recv.xid);
594 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
595 msg->msg_flags |= MSG_TRUNC;
596 goto out;
597 }
598 xprt_pin_rqst(req);
599 spin_unlock(&xprt->queue_lock);
600
601 ret = xs_read_stream_request(transport, msg, flags, req);
602
603 spin_lock(&xprt->queue_lock);
604 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
605 xprt_complete_rqst(req->rq_task, transport->recv.copied);
606 else
607 req->rq_private_buf.len = transport->recv.copied;
608 xprt_unpin_rqst(req);
609out:
610 spin_unlock(&xprt->queue_lock);
611 return ret;
612}
613
614static ssize_t
615xs_read_stream(struct sock_xprt *transport, int flags)
616{
617 struct msghdr msg = { 0 };
618 size_t want, read = 0;
619 ssize_t ret = 0;
620
621 if (transport->recv.len == 0) {
622 want = xs_read_stream_headersize(transport->recv.copied != 0);
623 ret = xs_read_stream_header(transport, &msg, flags, want,
624 transport->recv.offset);
625 if (ret <= 0)
626 goto out_err;
627 transport->recv.offset = ret;
628 if (transport->recv.offset != want)
629 return transport->recv.offset;
630 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
631 RPC_FRAGMENT_SIZE_MASK;
632 transport->recv.offset -= sizeof(transport->recv.fraghdr);
633 read = ret;
634 }
635
636 switch (be32_to_cpu(transport->recv.calldir)) {
637 default:
638 msg.msg_flags |= MSG_TRUNC;
639 break;
640 case RPC_CALL:
641 ret = xs_read_stream_call(transport, &msg, flags);
642 break;
643 case RPC_REPLY:
644 ret = xs_read_stream_reply(transport, &msg, flags);
645 }
646 if (msg.msg_flags & MSG_TRUNC) {
647 transport->recv.calldir = cpu_to_be32(-1);
648 transport->recv.copied = -1;
649 }
650 if (ret < 0)
651 goto out_err;
652 read += ret;
653 if (transport->recv.offset < transport->recv.len) {
654 if (!(msg.msg_flags & MSG_TRUNC))
655 return read;
656 msg.msg_flags = 0;
657 ret = xs_read_discard(transport->sock, &msg, flags,
658 transport->recv.len - transport->recv.offset);
659 if (ret <= 0)
660 goto out_err;
661 transport->recv.offset += ret;
662 read += ret;
663 if (transport->recv.offset != transport->recv.len)
664 return read;
665 }
666 if (xs_read_stream_request_done(transport)) {
667 trace_xs_stream_read_request(transport);
668 transport->recv.copied = 0;
669 }
670 transport->recv.offset = 0;
671 transport->recv.len = 0;
672 return read;
673out_err:
674 return ret != 0 ? ret : -ESHUTDOWN;
675}
676
677static __poll_t xs_poll_socket(struct sock_xprt *transport)
678{
679 return transport->sock->ops->poll(transport->file, transport->sock,
680 NULL);
681}
682
683static bool xs_poll_socket_readable(struct sock_xprt *transport)
684{
685 __poll_t events = xs_poll_socket(transport);
686
687 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
688}
689
690static void xs_poll_check_readable(struct sock_xprt *transport)
691{
692
693 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
694 if (!xs_poll_socket_readable(transport))
695 return;
696 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
697 queue_work(xprtiod_workqueue, &transport->recv_worker);
698}
699
700static void xs_stream_data_receive(struct sock_xprt *transport)
701{
702 size_t read = 0;
703 ssize_t ret = 0;
704
705 mutex_lock(&transport->recv_mutex);
706 if (transport->sock == NULL)
707 goto out;
708 for (;;) {
709 ret = xs_read_stream(transport, MSG_DONTWAIT);
710 if (ret < 0)
711 break;
712 read += ret;
713 cond_resched();
714 }
715 if (ret == -ESHUTDOWN)
716 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
717 else
718 xs_poll_check_readable(transport);
719out:
720 mutex_unlock(&transport->recv_mutex);
721 trace_xs_stream_read_data(&transport->xprt, ret, read);
722}
723
724static void xs_stream_data_receive_workfn(struct work_struct *work)
725{
726 struct sock_xprt *transport =
727 container_of(work, struct sock_xprt, recv_worker);
728 unsigned int pflags = memalloc_nofs_save();
729
730 xs_stream_data_receive(transport);
731 memalloc_nofs_restore(pflags);
732}
733
734static void
735xs_stream_reset_connect(struct sock_xprt *transport)
736{
737 transport->recv.offset = 0;
738 transport->recv.len = 0;
739 transport->recv.copied = 0;
740 transport->xmit.offset = 0;
741}
742
743static void
744xs_stream_start_connect(struct sock_xprt *transport)
745{
746 transport->xprt.stat.connect_count++;
747 transport->xprt.stat.connect_start = jiffies;
748}
749
750#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
751
752static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek)
753{
754 if (seek)
755 iov_iter_advance(&msg->msg_iter, seek);
756 return sock_sendmsg(sock, msg);
757}
758
759static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek)
760{
761 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
762 return xs_sendmsg(sock, msg, seek);
763}
764
765static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
766{
767 int err;
768
769 err = xdr_alloc_bvec(xdr, GFP_KERNEL);
770 if (err < 0)
771 return err;
772
773 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
774 xdr_buf_pagecount(xdr),
775 xdr->page_len + xdr->page_base);
776 return xs_sendmsg(sock, msg, base + xdr->page_base);
777}
778
779#define xs_record_marker_len() sizeof(rpc_fraghdr)
780
781/* Common case:
782 * - stream transport
783 * - sending from byte 0 of the message
784 * - the message is wholly contained in @xdr's head iovec
785 */
786static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
787 rpc_fraghdr marker, struct kvec *vec, size_t base)
788{
789 struct kvec iov[2] = {
790 [0] = {
791 .iov_base = &marker,
792 .iov_len = sizeof(marker)
793 },
794 [1] = *vec,
795 };
796 size_t len = iov[0].iov_len + iov[1].iov_len;
797
798 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
799 return xs_sendmsg(sock, msg, base);
800}
801
802/**
803 * xs_sendpages - write pages directly to a socket
804 * @sock: socket to send on
805 * @addr: UDP only -- address of destination
806 * @addrlen: UDP only -- length of destination address
807 * @xdr: buffer containing this request
808 * @base: starting position in the buffer
809 * @rm: stream record marker field
810 * @sent_p: return the total number of bytes successfully queued for sending
811 *
812 */
813static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p)
814{
815 struct msghdr msg = {
816 .msg_name = addr,
817 .msg_namelen = addrlen,
818 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE,
819 };
820 unsigned int rmsize = rm ? sizeof(rm) : 0;
821 unsigned int remainder = rmsize + xdr->len - base;
822 unsigned int want;
823 int err = 0;
824
825 if (unlikely(!sock))
826 return -ENOTSOCK;
827
828 want = xdr->head[0].iov_len + rmsize;
829 if (base < want) {
830 unsigned int len = want - base;
831 remainder -= len;
832 if (remainder == 0)
833 msg.msg_flags &= ~MSG_MORE;
834 if (rmsize)
835 err = xs_send_rm_and_kvec(sock, &msg, rm,
836 &xdr->head[0], base);
837 else
838 err = xs_send_kvec(sock, &msg, &xdr->head[0], base);
839 if (remainder == 0 || err != len)
840 goto out;
841 *sent_p += err;
842 base = 0;
843 } else
844 base -= want;
845
846 if (base < xdr->page_len) {
847 unsigned int len = xdr->page_len - base;
848 remainder -= len;
849 if (remainder == 0)
850 msg.msg_flags &= ~MSG_MORE;
851 err = xs_send_pagedata(sock, &msg, xdr, base);
852 if (remainder == 0 || err != len)
853 goto out;
854 *sent_p += err;
855 base = 0;
856 } else
857 base -= xdr->page_len;
858
859 if (base >= xdr->tail[0].iov_len)
860 return 0;
861 msg.msg_flags &= ~MSG_MORE;
862 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base);
863out:
864 if (err > 0) {
865 *sent_p += err;
866 err = 0;
867 }
868 return err;
869}
870
871/**
872 * xs_nospace - handle transmit was incomplete
873 * @req: pointer to RPC request
874 *
875 */
876static int xs_nospace(struct rpc_rqst *req)
877{
878 struct rpc_xprt *xprt = req->rq_xprt;
879 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
880 struct sock *sk = transport->inet;
881 int ret = -EAGAIN;
882
883 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
884 req->rq_task->tk_pid,
885 req->rq_slen - transport->xmit.offset,
886 req->rq_slen);
887
888 /* Protect against races with write_space */
889 spin_lock(&xprt->transport_lock);
890
891 /* Don't race with disconnect */
892 if (xprt_connected(xprt)) {
893 /* wait for more buffer space */
894 sk->sk_write_pending++;
895 xprt_wait_for_buffer_space(xprt);
896 } else
897 ret = -ENOTCONN;
898
899 spin_unlock(&xprt->transport_lock);
900
901 /* Race breaker in case memory is freed before above code is called */
902 if (ret == -EAGAIN) {
903 struct socket_wq *wq;
904
905 rcu_read_lock();
906 wq = rcu_dereference(sk->sk_wq);
907 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
908 rcu_read_unlock();
909
910 sk->sk_write_space(sk);
911 }
912 return ret;
913}
914
915static void
916xs_stream_prepare_request(struct rpc_rqst *req)
917{
918 xdr_free_bvec(&req->rq_rcv_buf);
919 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
920}
921
922/*
923 * Determine if the previous message in the stream was aborted before it
924 * could complete transmission.
925 */
926static bool
927xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
928{
929 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
930}
931
932/*
933 * Return the stream record marker field for a record of length < 2^31-1
934 */
935static rpc_fraghdr
936xs_stream_record_marker(struct xdr_buf *xdr)
937{
938 if (!xdr->len)
939 return 0;
940 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
941}
942
943/**
944 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
945 * @req: pointer to RPC request
946 *
947 * Return values:
948 * 0: The request has been sent
949 * EAGAIN: The socket was blocked, please call again later to
950 * complete the request
951 * ENOTCONN: Caller needs to invoke connect logic then call again
952 * other: Some other error occured, the request was not sent
953 */
954static int xs_local_send_request(struct rpc_rqst *req)
955{
956 struct rpc_xprt *xprt = req->rq_xprt;
957 struct sock_xprt *transport =
958 container_of(xprt, struct sock_xprt, xprt);
959 struct xdr_buf *xdr = &req->rq_snd_buf;
960 rpc_fraghdr rm = xs_stream_record_marker(xdr);
961 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
962 int status;
963 int sent = 0;
964
965 /* Close the stream if the previous transmission was incomplete */
966 if (xs_send_request_was_aborted(transport, req)) {
967 xs_close(xprt);
968 return -ENOTCONN;
969 }
970
971 xs_pktdump("packet data:",
972 req->rq_svec->iov_base, req->rq_svec->iov_len);
973
974 req->rq_xtime = ktime_get();
975 status = xs_sendpages(transport->sock, NULL, 0, xdr,
976 transport->xmit.offset, rm, &sent);
977 dprintk("RPC: %s(%u) = %d\n",
978 __func__, xdr->len - transport->xmit.offset, status);
979
980 if (status == -EAGAIN && sock_writeable(transport->inet))
981 status = -ENOBUFS;
982
983 if (likely(sent > 0) || status == 0) {
984 transport->xmit.offset += sent;
985 req->rq_bytes_sent = transport->xmit.offset;
986 if (likely(req->rq_bytes_sent >= msglen)) {
987 req->rq_xmit_bytes_sent += transport->xmit.offset;
988 transport->xmit.offset = 0;
989 return 0;
990 }
991 status = -EAGAIN;
992 }
993
994 switch (status) {
995 case -ENOBUFS:
996 break;
997 case -EAGAIN:
998 status = xs_nospace(req);
999 break;
1000 default:
1001 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1002 -status);
1003 /* fall through */
1004 case -EPIPE:
1005 xs_close(xprt);
1006 status = -ENOTCONN;
1007 }
1008
1009 return status;
1010}
1011
1012/**
1013 * xs_udp_send_request - write an RPC request to a UDP socket
1014 * @req: pointer to RPC request
1015 *
1016 * Return values:
1017 * 0: The request has been sent
1018 * EAGAIN: The socket was blocked, please call again later to
1019 * complete the request
1020 * ENOTCONN: Caller needs to invoke connect logic then call again
1021 * other: Some other error occurred, the request was not sent
1022 */
1023static int xs_udp_send_request(struct rpc_rqst *req)
1024{
1025 struct rpc_xprt *xprt = req->rq_xprt;
1026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1027 struct xdr_buf *xdr = &req->rq_snd_buf;
1028 int sent = 0;
1029 int status;
1030
1031 xs_pktdump("packet data:",
1032 req->rq_svec->iov_base,
1033 req->rq_svec->iov_len);
1034
1035 if (!xprt_bound(xprt))
1036 return -ENOTCONN;
1037
1038 if (!xprt_request_get_cong(xprt, req))
1039 return -EBADSLT;
1040
1041 req->rq_xtime = ktime_get();
1042 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
1043 xdr, 0, 0, &sent);
1044
1045 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1046 xdr->len, status);
1047
1048 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1049 if (status == -EPERM)
1050 goto process_status;
1051
1052 if (status == -EAGAIN && sock_writeable(transport->inet))
1053 status = -ENOBUFS;
1054
1055 if (sent > 0 || status == 0) {
1056 req->rq_xmit_bytes_sent += sent;
1057 if (sent >= req->rq_slen)
1058 return 0;
1059 /* Still some bytes left; set up for a retry later. */
1060 status = -EAGAIN;
1061 }
1062
1063process_status:
1064 switch (status) {
1065 case -ENOTSOCK:
1066 status = -ENOTCONN;
1067 /* Should we call xs_close() here? */
1068 break;
1069 case -EAGAIN:
1070 status = xs_nospace(req);
1071 break;
1072 case -ENETUNREACH:
1073 case -ENOBUFS:
1074 case -EPIPE:
1075 case -ECONNREFUSED:
1076 case -EPERM:
1077 /* When the server has died, an ICMP port unreachable message
1078 * prompts ECONNREFUSED. */
1079 break;
1080 default:
1081 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1082 -status);
1083 }
1084
1085 return status;
1086}
1087
1088/**
1089 * xs_tcp_send_request - write an RPC request to a TCP socket
1090 * @req: pointer to RPC request
1091 *
1092 * Return values:
1093 * 0: The request has been sent
1094 * EAGAIN: The socket was blocked, please call again later to
1095 * complete the request
1096 * ENOTCONN: Caller needs to invoke connect logic then call again
1097 * other: Some other error occurred, the request was not sent
1098 *
1099 * XXX: In the case of soft timeouts, should we eventually give up
1100 * if sendmsg is not able to make progress?
1101 */
1102static int xs_tcp_send_request(struct rpc_rqst *req)
1103{
1104 struct rpc_xprt *xprt = req->rq_xprt;
1105 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1106 struct xdr_buf *xdr = &req->rq_snd_buf;
1107 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1108 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1109 bool vm_wait = false;
1110 int status;
1111 int sent;
1112
1113 /* Close the stream if the previous transmission was incomplete */
1114 if (xs_send_request_was_aborted(transport, req)) {
1115 if (transport->sock != NULL)
1116 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1117 return -ENOTCONN;
1118 }
1119
1120 xs_pktdump("packet data:",
1121 req->rq_svec->iov_base,
1122 req->rq_svec->iov_len);
1123
1124 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1125 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1126
1127 /* Continue transmitting the packet/record. We must be careful
1128 * to cope with writespace callbacks arriving _after_ we have
1129 * called sendmsg(). */
1130 req->rq_xtime = ktime_get();
1131 while (1) {
1132 sent = 0;
1133 status = xs_sendpages(transport->sock, NULL, 0, xdr,
1134 transport->xmit.offset, rm, &sent);
1135
1136 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1137 xdr->len - transport->xmit.offset, status);
1138
1139 /* If we've sent the entire packet, immediately
1140 * reset the count of bytes sent. */
1141 transport->xmit.offset += sent;
1142 req->rq_bytes_sent = transport->xmit.offset;
1143 if (likely(req->rq_bytes_sent >= msglen)) {
1144 req->rq_xmit_bytes_sent += transport->xmit.offset;
1145 transport->xmit.offset = 0;
1146 return 0;
1147 }
1148
1149 WARN_ON_ONCE(sent == 0 && status == 0);
1150
1151 if (status == -EAGAIN ) {
1152 /*
1153 * Return EAGAIN if we're sure we're hitting the
1154 * socket send buffer limits.
1155 */
1156 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1157 break;
1158 /*
1159 * Did we hit a memory allocation failure?
1160 */
1161 if (sent == 0) {
1162 status = -ENOBUFS;
1163 if (vm_wait)
1164 break;
1165 /* Retry, knowing now that we're below the
1166 * socket send buffer limit
1167 */
1168 vm_wait = true;
1169 }
1170 continue;
1171 }
1172 if (status < 0)
1173 break;
1174 vm_wait = false;
1175 }
1176
1177 switch (status) {
1178 case -ENOTSOCK:
1179 status = -ENOTCONN;
1180 /* Should we call xs_close() here? */
1181 break;
1182 case -EAGAIN:
1183 status = xs_nospace(req);
1184 break;
1185 case -ECONNRESET:
1186 case -ECONNREFUSED:
1187 case -ENOTCONN:
1188 case -EADDRINUSE:
1189 case -ENOBUFS:
1190 case -EPIPE:
1191 break;
1192 default:
1193 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1194 -status);
1195 }
1196
1197 return status;
1198}
1199
1200static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1201{
1202 transport->old_data_ready = sk->sk_data_ready;
1203 transport->old_state_change = sk->sk_state_change;
1204 transport->old_write_space = sk->sk_write_space;
1205 transport->old_error_report = sk->sk_error_report;
1206}
1207
1208static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1209{
1210 sk->sk_data_ready = transport->old_data_ready;
1211 sk->sk_state_change = transport->old_state_change;
1212 sk->sk_write_space = transport->old_write_space;
1213 sk->sk_error_report = transport->old_error_report;
1214}
1215
1216static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1217{
1218 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1219
1220 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1221 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1222 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1223 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1224}
1225
1226static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1227{
1228 set_bit(nr, &transport->sock_state);
1229 queue_work(xprtiod_workqueue, &transport->error_worker);
1230}
1231
1232static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1233{
1234 smp_mb__before_atomic();
1235 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1236 clear_bit(XPRT_CLOSING, &xprt->state);
1237 xs_sock_reset_state_flags(xprt);
1238 smp_mb__after_atomic();
1239}
1240
1241/**
1242 * xs_error_report - callback to handle TCP socket state errors
1243 * @sk: socket
1244 *
1245 * Note: we don't call sock_error() since there may be a rpc_task
1246 * using the socket, and so we don't want to clear sk->sk_err.
1247 */
1248static void xs_error_report(struct sock *sk)
1249{
1250 struct sock_xprt *transport;
1251 struct rpc_xprt *xprt;
1252
1253 read_lock_bh(&sk->sk_callback_lock);
1254 if (!(xprt = xprt_from_sock(sk)))
1255 goto out;
1256
1257 transport = container_of(xprt, struct sock_xprt, xprt);
1258 transport->xprt_err = -sk->sk_err;
1259 if (transport->xprt_err == 0)
1260 goto out;
1261 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1262 xprt, -transport->xprt_err);
1263 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1264
1265 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1266 smp_mb__before_atomic();
1267 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1268 out:
1269 read_unlock_bh(&sk->sk_callback_lock);
1270}
1271
1272static void xs_reset_transport(struct sock_xprt *transport)
1273{
1274 struct socket *sock = transport->sock;
1275 struct sock *sk = transport->inet;
1276 struct rpc_xprt *xprt = &transport->xprt;
1277 struct file *filp = transport->file;
1278
1279 if (sk == NULL)
1280 return;
1281
1282 if (atomic_read(&transport->xprt.swapper))
1283 sk_clear_memalloc(sk);
1284
1285 kernel_sock_shutdown(sock, SHUT_RDWR);
1286
1287 mutex_lock(&transport->recv_mutex);
1288 write_lock_bh(&sk->sk_callback_lock);
1289 transport->inet = NULL;
1290 transport->sock = NULL;
1291 transport->file = NULL;
1292
1293 sk->sk_user_data = NULL;
1294
1295 xs_restore_old_callbacks(transport, sk);
1296 xprt_clear_connected(xprt);
1297 write_unlock_bh(&sk->sk_callback_lock);
1298 xs_sock_reset_connection_flags(xprt);
1299 /* Reset stream record info */
1300 xs_stream_reset_connect(transport);
1301 mutex_unlock(&transport->recv_mutex);
1302
1303 trace_rpc_socket_close(xprt, sock);
1304 fput(filp);
1305
1306 xprt_disconnect_done(xprt);
1307}
1308
1309/**
1310 * xs_close - close a socket
1311 * @xprt: transport
1312 *
1313 * This is used when all requests are complete; ie, no DRC state remains
1314 * on the server we want to save.
1315 *
1316 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1317 * xs_reset_transport() zeroing the socket from underneath a writer.
1318 */
1319static void xs_close(struct rpc_xprt *xprt)
1320{
1321 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1322
1323 dprintk("RPC: xs_close xprt %p\n", xprt);
1324
1325 xs_reset_transport(transport);
1326 xprt->reestablish_timeout = 0;
1327}
1328
1329static void xs_inject_disconnect(struct rpc_xprt *xprt)
1330{
1331 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1332 xprt);
1333 xprt_disconnect_done(xprt);
1334}
1335
1336static void xs_xprt_free(struct rpc_xprt *xprt)
1337{
1338 xs_free_peer_addresses(xprt);
1339 xprt_free(xprt);
1340}
1341
1342/**
1343 * xs_destroy - prepare to shutdown a transport
1344 * @xprt: doomed transport
1345 *
1346 */
1347static void xs_destroy(struct rpc_xprt *xprt)
1348{
1349 struct sock_xprt *transport = container_of(xprt,
1350 struct sock_xprt, xprt);
1351 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1352
1353 cancel_delayed_work_sync(&transport->connect_worker);
1354 xs_close(xprt);
1355 cancel_work_sync(&transport->recv_worker);
1356 cancel_work_sync(&transport->error_worker);
1357 xs_xprt_free(xprt);
1358 module_put(THIS_MODULE);
1359}
1360
1361/**
1362 * xs_udp_data_read_skb - receive callback for UDP sockets
1363 * @xprt: transport
1364 * @sk: socket
1365 * @skb: skbuff
1366 *
1367 */
1368static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1369 struct sock *sk,
1370 struct sk_buff *skb)
1371{
1372 struct rpc_task *task;
1373 struct rpc_rqst *rovr;
1374 int repsize, copied;
1375 u32 _xid;
1376 __be32 *xp;
1377
1378 repsize = skb->len;
1379 if (repsize < 4) {
1380 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1381 return;
1382 }
1383
1384 /* Copy the XID from the skb... */
1385 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1386 if (xp == NULL)
1387 return;
1388
1389 /* Look up and lock the request corresponding to the given XID */
1390 spin_lock(&xprt->queue_lock);
1391 rovr = xprt_lookup_rqst(xprt, *xp);
1392 if (!rovr)
1393 goto out_unlock;
1394 xprt_pin_rqst(rovr);
1395 xprt_update_rtt(rovr->rq_task);
1396 spin_unlock(&xprt->queue_lock);
1397 task = rovr->rq_task;
1398
1399 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1400 copied = repsize;
1401
1402 /* Suck it into the iovec, verify checksum if not done by hw. */
1403 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1404 spin_lock(&xprt->queue_lock);
1405 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1406 goto out_unpin;
1407 }
1408
1409
1410 spin_lock(&xprt->transport_lock);
1411 xprt_adjust_cwnd(xprt, task, copied);
1412 spin_unlock(&xprt->transport_lock);
1413 spin_lock(&xprt->queue_lock);
1414 xprt_complete_rqst(task, copied);
1415 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1416out_unpin:
1417 xprt_unpin_rqst(rovr);
1418 out_unlock:
1419 spin_unlock(&xprt->queue_lock);
1420}
1421
1422static void xs_udp_data_receive(struct sock_xprt *transport)
1423{
1424 struct sk_buff *skb;
1425 struct sock *sk;
1426 int err;
1427
1428 mutex_lock(&transport->recv_mutex);
1429 sk = transport->inet;
1430 if (sk == NULL)
1431 goto out;
1432 for (;;) {
1433 skb = skb_recv_udp(sk, 0, 1, &err);
1434 if (skb == NULL)
1435 break;
1436 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1437 consume_skb(skb);
1438 cond_resched();
1439 }
1440 xs_poll_check_readable(transport);
1441out:
1442 mutex_unlock(&transport->recv_mutex);
1443}
1444
1445static void xs_udp_data_receive_workfn(struct work_struct *work)
1446{
1447 struct sock_xprt *transport =
1448 container_of(work, struct sock_xprt, recv_worker);
1449 unsigned int pflags = memalloc_nofs_save();
1450
1451 xs_udp_data_receive(transport);
1452 memalloc_nofs_restore(pflags);
1453}
1454
1455/**
1456 * xs_data_ready - "data ready" callback for UDP sockets
1457 * @sk: socket with data to read
1458 *
1459 */
1460static void xs_data_ready(struct sock *sk)
1461{
1462 struct rpc_xprt *xprt;
1463
1464 read_lock_bh(&sk->sk_callback_lock);
1465 dprintk("RPC: xs_data_ready...\n");
1466 xprt = xprt_from_sock(sk);
1467 if (xprt != NULL) {
1468 struct sock_xprt *transport = container_of(xprt,
1469 struct sock_xprt, xprt);
1470 transport->old_data_ready(sk);
1471 /* Any data means we had a useful conversation, so
1472 * then we don't need to delay the next reconnect
1473 */
1474 if (xprt->reestablish_timeout)
1475 xprt->reestablish_timeout = 0;
1476 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1477 queue_work(xprtiod_workqueue, &transport->recv_worker);
1478 }
1479 read_unlock_bh(&sk->sk_callback_lock);
1480}
1481
1482/*
1483 * Helper function to force a TCP close if the server is sending
1484 * junk and/or it has put us in CLOSE_WAIT
1485 */
1486static void xs_tcp_force_close(struct rpc_xprt *xprt)
1487{
1488 xprt_force_disconnect(xprt);
1489}
1490
1491#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1492static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1493{
1494 return PAGE_SIZE;
1495}
1496#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1497
1498/**
1499 * xs_tcp_state_change - callback to handle TCP socket state changes
1500 * @sk: socket whose state has changed
1501 *
1502 */
1503static void xs_tcp_state_change(struct sock *sk)
1504{
1505 struct rpc_xprt *xprt;
1506 struct sock_xprt *transport;
1507
1508 read_lock_bh(&sk->sk_callback_lock);
1509 if (!(xprt = xprt_from_sock(sk)))
1510 goto out;
1511 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1512 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1513 sk->sk_state, xprt_connected(xprt),
1514 sock_flag(sk, SOCK_DEAD),
1515 sock_flag(sk, SOCK_ZAPPED),
1516 sk->sk_shutdown);
1517
1518 transport = container_of(xprt, struct sock_xprt, xprt);
1519 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1520 switch (sk->sk_state) {
1521 case TCP_ESTABLISHED:
1522 if (!xprt_test_and_set_connected(xprt)) {
1523 xprt->connect_cookie++;
1524 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1525 xprt_clear_connecting(xprt);
1526
1527 xprt->stat.connect_count++;
1528 xprt->stat.connect_time += (long)jiffies -
1529 xprt->stat.connect_start;
1530 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1531 }
1532 break;
1533 case TCP_FIN_WAIT1:
1534 /* The client initiated a shutdown of the socket */
1535 xprt->connect_cookie++;
1536 xprt->reestablish_timeout = 0;
1537 set_bit(XPRT_CLOSING, &xprt->state);
1538 smp_mb__before_atomic();
1539 clear_bit(XPRT_CONNECTED, &xprt->state);
1540 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1541 smp_mb__after_atomic();
1542 break;
1543 case TCP_CLOSE_WAIT:
1544 /* The server initiated a shutdown of the socket */
1545 xprt->connect_cookie++;
1546 clear_bit(XPRT_CONNECTED, &xprt->state);
1547 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1548 /* fall through */
1549 case TCP_CLOSING:
1550 /*
1551 * If the server closed down the connection, make sure that
1552 * we back off before reconnecting
1553 */
1554 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1555 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1556 break;
1557 case TCP_LAST_ACK:
1558 set_bit(XPRT_CLOSING, &xprt->state);
1559 smp_mb__before_atomic();
1560 clear_bit(XPRT_CONNECTED, &xprt->state);
1561 smp_mb__after_atomic();
1562 break;
1563 case TCP_CLOSE:
1564 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1565 &transport->sock_state))
1566 xprt_clear_connecting(xprt);
1567 clear_bit(XPRT_CLOSING, &xprt->state);
1568 /* Trigger the socket release */
1569 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1570 }
1571 out:
1572 read_unlock_bh(&sk->sk_callback_lock);
1573}
1574
1575static void xs_write_space(struct sock *sk)
1576{
1577 struct socket_wq *wq;
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 rcu_read_lock();
1589 wq = rcu_dereference(sk->sk_wq);
1590 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1591 goto out;
1592
1593 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1594 sk->sk_write_pending--;
1595out:
1596 rcu_read_unlock();
1597}
1598
1599/**
1600 * xs_udp_write_space - callback invoked when socket buffer space
1601 * becomes available
1602 * @sk: socket whose state has changed
1603 *
1604 * Called when more output buffer space is available for this socket.
1605 * We try not to wake our writers until they can make "significant"
1606 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1607 * with a bunch of small requests.
1608 */
1609static void xs_udp_write_space(struct sock *sk)
1610{
1611 read_lock_bh(&sk->sk_callback_lock);
1612
1613 /* from net/core/sock.c:sock_def_write_space */
1614 if (sock_writeable(sk))
1615 xs_write_space(sk);
1616
1617 read_unlock_bh(&sk->sk_callback_lock);
1618}
1619
1620/**
1621 * xs_tcp_write_space - callback invoked when socket buffer space
1622 * becomes available
1623 * @sk: socket whose state has changed
1624 *
1625 * Called when more output buffer space is available for this socket.
1626 * We try not to wake our writers until they can make "significant"
1627 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1628 * with a bunch of small requests.
1629 */
1630static void xs_tcp_write_space(struct sock *sk)
1631{
1632 read_lock_bh(&sk->sk_callback_lock);
1633
1634 /* from net/core/stream.c:sk_stream_write_space */
1635 if (sk_stream_is_writeable(sk))
1636 xs_write_space(sk);
1637
1638 read_unlock_bh(&sk->sk_callback_lock);
1639}
1640
1641static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1642{
1643 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1644 struct sock *sk = transport->inet;
1645
1646 if (transport->rcvsize) {
1647 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1648 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1649 }
1650 if (transport->sndsize) {
1651 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1652 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1653 sk->sk_write_space(sk);
1654 }
1655}
1656
1657/**
1658 * xs_udp_set_buffer_size - set send and receive limits
1659 * @xprt: generic transport
1660 * @sndsize: requested size of send buffer, in bytes
1661 * @rcvsize: requested size of receive buffer, in bytes
1662 *
1663 * Set socket send and receive buffer size limits.
1664 */
1665static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1666{
1667 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1668
1669 transport->sndsize = 0;
1670 if (sndsize)
1671 transport->sndsize = sndsize + 1024;
1672 transport->rcvsize = 0;
1673 if (rcvsize)
1674 transport->rcvsize = rcvsize + 1024;
1675
1676 xs_udp_do_set_buffer_size(xprt);
1677}
1678
1679/**
1680 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1681 * @xprt: controlling transport
1682 * @task: task that timed out
1683 *
1684 * Adjust the congestion window after a retransmit timeout has occurred.
1685 */
1686static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1687{
1688 spin_lock(&xprt->transport_lock);
1689 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1690 spin_unlock(&xprt->transport_lock);
1691}
1692
1693static int xs_get_random_port(void)
1694{
1695 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1696 unsigned short range;
1697 unsigned short rand;
1698
1699 if (max < min)
1700 return -EADDRINUSE;
1701 range = max - min + 1;
1702 rand = (unsigned short) prandom_u32() % range;
1703 return rand + min;
1704}
1705
1706/**
1707 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1708 * @sock: socket
1709 *
1710 * Note that this function has to be called on all sockets that share the
1711 * same port, and it must be called before binding.
1712 */
1713static void xs_sock_set_reuseport(struct socket *sock)
1714{
1715 int opt = 1;
1716
1717 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1718 (char *)&opt, sizeof(opt));
1719}
1720
1721static unsigned short xs_sock_getport(struct socket *sock)
1722{
1723 struct sockaddr_storage buf;
1724 unsigned short port = 0;
1725
1726 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1727 goto out;
1728 switch (buf.ss_family) {
1729 case AF_INET6:
1730 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1731 break;
1732 case AF_INET:
1733 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1734 }
1735out:
1736 return port;
1737}
1738
1739/**
1740 * xs_set_port - reset the port number in the remote endpoint address
1741 * @xprt: generic transport
1742 * @port: new port number
1743 *
1744 */
1745static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1746{
1747 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1748
1749 rpc_set_port(xs_addr(xprt), port);
1750 xs_update_peer_port(xprt);
1751}
1752
1753static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1754{
1755 if (transport->srcport == 0)
1756 transport->srcport = xs_sock_getport(sock);
1757}
1758
1759static int xs_get_srcport(struct sock_xprt *transport)
1760{
1761 int port = transport->srcport;
1762
1763 if (port == 0 && transport->xprt.resvport)
1764 port = xs_get_random_port();
1765 return port;
1766}
1767
1768static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1769{
1770 if (transport->srcport != 0)
1771 transport->srcport = 0;
1772 if (!transport->xprt.resvport)
1773 return 0;
1774 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1775 return xprt_max_resvport;
1776 return --port;
1777}
1778static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1779{
1780 struct sockaddr_storage myaddr;
1781 int err, nloop = 0;
1782 int port = xs_get_srcport(transport);
1783 unsigned short last;
1784
1785 /*
1786 * If we are asking for any ephemeral port (i.e. port == 0 &&
1787 * transport->xprt.resvport == 0), don't bind. Let the local
1788 * port selection happen implicitly when the socket is used
1789 * (for example at connect time).
1790 *
1791 * This ensures that we can continue to establish TCP
1792 * connections even when all local ephemeral ports are already
1793 * a part of some TCP connection. This makes no difference
1794 * for UDP sockets, but also doens't harm them.
1795 *
1796 * If we're asking for any reserved port (i.e. port == 0 &&
1797 * transport->xprt.resvport == 1) xs_get_srcport above will
1798 * ensure that port is non-zero and we will bind as needed.
1799 */
1800 if (port <= 0)
1801 return port;
1802
1803 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1804 do {
1805 rpc_set_port((struct sockaddr *)&myaddr, port);
1806 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1807 transport->xprt.addrlen);
1808 if (err == 0) {
1809 transport->srcport = port;
1810 break;
1811 }
1812 last = port;
1813 port = xs_next_srcport(transport, port);
1814 if (port > last)
1815 nloop++;
1816 } while (err == -EADDRINUSE && nloop != 2);
1817
1818 if (myaddr.ss_family == AF_INET)
1819 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1820 &((struct sockaddr_in *)&myaddr)->sin_addr,
1821 port, err ? "failed" : "ok", err);
1822 else
1823 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1824 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1825 port, err ? "failed" : "ok", err);
1826 return err;
1827}
1828
1829/*
1830 * We don't support autobind on AF_LOCAL sockets
1831 */
1832static void xs_local_rpcbind(struct rpc_task *task)
1833{
1834 xprt_set_bound(task->tk_xprt);
1835}
1836
1837static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1838{
1839}
1840
1841#ifdef CONFIG_DEBUG_LOCK_ALLOC
1842static struct lock_class_key xs_key[2];
1843static struct lock_class_key xs_slock_key[2];
1844
1845static inline void xs_reclassify_socketu(struct socket *sock)
1846{
1847 struct sock *sk = sock->sk;
1848
1849 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1850 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1851}
1852
1853static inline void xs_reclassify_socket4(struct socket *sock)
1854{
1855 struct sock *sk = sock->sk;
1856
1857 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1858 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1859}
1860
1861static inline void xs_reclassify_socket6(struct socket *sock)
1862{
1863 struct sock *sk = sock->sk;
1864
1865 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1866 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1867}
1868
1869static inline void xs_reclassify_socket(int family, struct socket *sock)
1870{
1871 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1872 return;
1873
1874 switch (family) {
1875 case AF_LOCAL:
1876 xs_reclassify_socketu(sock);
1877 break;
1878 case AF_INET:
1879 xs_reclassify_socket4(sock);
1880 break;
1881 case AF_INET6:
1882 xs_reclassify_socket6(sock);
1883 break;
1884 }
1885}
1886#else
1887static inline void xs_reclassify_socket(int family, struct socket *sock)
1888{
1889}
1890#endif
1891
1892static void xs_dummy_setup_socket(struct work_struct *work)
1893{
1894}
1895
1896static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1897 struct sock_xprt *transport, int family, int type,
1898 int protocol, bool reuseport)
1899{
1900 struct file *filp;
1901 struct socket *sock;
1902 int err;
1903
1904 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1905 if (err < 0) {
1906 dprintk("RPC: can't create %d transport socket (%d).\n",
1907 protocol, -err);
1908 goto out;
1909 }
1910 xs_reclassify_socket(family, sock);
1911
1912 if (reuseport)
1913 xs_sock_set_reuseport(sock);
1914
1915 err = xs_bind(transport, sock);
1916 if (err) {
1917 sock_release(sock);
1918 goto out;
1919 }
1920
1921 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1922 if (IS_ERR(filp))
1923 return ERR_CAST(filp);
1924 transport->file = filp;
1925
1926 return sock;
1927out:
1928 return ERR_PTR(err);
1929}
1930
1931static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1932 struct socket *sock)
1933{
1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1935 xprt);
1936
1937 if (!transport->inet) {
1938 struct sock *sk = sock->sk;
1939
1940 write_lock_bh(&sk->sk_callback_lock);
1941
1942 xs_save_old_callbacks(transport, sk);
1943
1944 sk->sk_user_data = xprt;
1945 sk->sk_data_ready = xs_data_ready;
1946 sk->sk_write_space = xs_udp_write_space;
1947 sock_set_flag(sk, SOCK_FASYNC);
1948 sk->sk_error_report = xs_error_report;
1949
1950 xprt_clear_connected(xprt);
1951
1952 /* Reset to new socket */
1953 transport->sock = sock;
1954 transport->inet = sk;
1955
1956 write_unlock_bh(&sk->sk_callback_lock);
1957 }
1958
1959 xs_stream_start_connect(transport);
1960
1961 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1962}
1963
1964/**
1965 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1966 * @transport: socket transport to connect
1967 */
1968static int xs_local_setup_socket(struct sock_xprt *transport)
1969{
1970 struct rpc_xprt *xprt = &transport->xprt;
1971 struct file *filp;
1972 struct socket *sock;
1973 int status = -EIO;
1974
1975 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1976 SOCK_STREAM, 0, &sock, 1);
1977 if (status < 0) {
1978 dprintk("RPC: can't create AF_LOCAL "
1979 "transport socket (%d).\n", -status);
1980 goto out;
1981 }
1982 xs_reclassify_socket(AF_LOCAL, sock);
1983
1984 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1985 if (IS_ERR(filp)) {
1986 status = PTR_ERR(filp);
1987 goto out;
1988 }
1989 transport->file = filp;
1990
1991 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1992 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1993
1994 status = xs_local_finish_connecting(xprt, sock);
1995 trace_rpc_socket_connect(xprt, sock, status);
1996 switch (status) {
1997 case 0:
1998 dprintk("RPC: xprt %p connected to %s\n",
1999 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2000 xprt->stat.connect_count++;
2001 xprt->stat.connect_time += (long)jiffies -
2002 xprt->stat.connect_start;
2003 xprt_set_connected(xprt);
2004 case -ENOBUFS:
2005 break;
2006 case -ENOENT:
2007 dprintk("RPC: xprt %p: socket %s does not exist\n",
2008 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2009 break;
2010 case -ECONNREFUSED:
2011 dprintk("RPC: xprt %p: connection refused for %s\n",
2012 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2013 break;
2014 default:
2015 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2016 __func__, -status,
2017 xprt->address_strings[RPC_DISPLAY_ADDR]);
2018 }
2019
2020out:
2021 xprt_clear_connecting(xprt);
2022 xprt_wake_pending_tasks(xprt, status);
2023 return status;
2024}
2025
2026static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2027{
2028 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2029 int ret;
2030
2031 if (RPC_IS_ASYNC(task)) {
2032 /*
2033 * We want the AF_LOCAL connect to be resolved in the
2034 * filesystem namespace of the process making the rpc
2035 * call. Thus we connect synchronously.
2036 *
2037 * If we want to support asynchronous AF_LOCAL calls,
2038 * we'll need to figure out how to pass a namespace to
2039 * connect.
2040 */
2041 task->tk_rpc_status = -ENOTCONN;
2042 rpc_exit(task, -ENOTCONN);
2043 return;
2044 }
2045 ret = xs_local_setup_socket(transport);
2046 if (ret && !RPC_IS_SOFTCONN(task))
2047 msleep_interruptible(15000);
2048}
2049
2050#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2051/*
2052 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2053 * know that we have exclusive access to the socket), to guard against
2054 * races with xs_reset_transport.
2055 */
2056static void xs_set_memalloc(struct rpc_xprt *xprt)
2057{
2058 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2059 xprt);
2060
2061 /*
2062 * If there's no sock, then we have nothing to set. The
2063 * reconnecting process will get it for us.
2064 */
2065 if (!transport->inet)
2066 return;
2067 if (atomic_read(&xprt->swapper))
2068 sk_set_memalloc(transport->inet);
2069}
2070
2071/**
2072 * xs_enable_swap - Tag this transport as being used for swap.
2073 * @xprt: transport to tag
2074 *
2075 * Take a reference to this transport on behalf of the rpc_clnt, and
2076 * optionally mark it for swapping if it wasn't already.
2077 */
2078static int
2079xs_enable_swap(struct rpc_xprt *xprt)
2080{
2081 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2082
2083 if (atomic_inc_return(&xprt->swapper) != 1)
2084 return 0;
2085 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2086 return -ERESTARTSYS;
2087 if (xs->inet)
2088 sk_set_memalloc(xs->inet);
2089 xprt_release_xprt(xprt, NULL);
2090 return 0;
2091}
2092
2093/**
2094 * xs_disable_swap - Untag this transport as being used for swap.
2095 * @xprt: transport to tag
2096 *
2097 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2098 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2099 */
2100static void
2101xs_disable_swap(struct rpc_xprt *xprt)
2102{
2103 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2104
2105 if (!atomic_dec_and_test(&xprt->swapper))
2106 return;
2107 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2108 return;
2109 if (xs->inet)
2110 sk_clear_memalloc(xs->inet);
2111 xprt_release_xprt(xprt, NULL);
2112}
2113#else
2114static void xs_set_memalloc(struct rpc_xprt *xprt)
2115{
2116}
2117
2118static int
2119xs_enable_swap(struct rpc_xprt *xprt)
2120{
2121 return -EINVAL;
2122}
2123
2124static void
2125xs_disable_swap(struct rpc_xprt *xprt)
2126{
2127}
2128#endif
2129
2130static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2131{
2132 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2133
2134 if (!transport->inet) {
2135 struct sock *sk = sock->sk;
2136
2137 write_lock_bh(&sk->sk_callback_lock);
2138
2139 xs_save_old_callbacks(transport, sk);
2140
2141 sk->sk_user_data = xprt;
2142 sk->sk_data_ready = xs_data_ready;
2143 sk->sk_write_space = xs_udp_write_space;
2144 sock_set_flag(sk, SOCK_FASYNC);
2145
2146 xprt_set_connected(xprt);
2147
2148 /* Reset to new socket */
2149 transport->sock = sock;
2150 transport->inet = sk;
2151
2152 xs_set_memalloc(xprt);
2153
2154 write_unlock_bh(&sk->sk_callback_lock);
2155 }
2156 xs_udp_do_set_buffer_size(xprt);
2157
2158 xprt->stat.connect_start = jiffies;
2159}
2160
2161static void xs_udp_setup_socket(struct work_struct *work)
2162{
2163 struct sock_xprt *transport =
2164 container_of(work, struct sock_xprt, connect_worker.work);
2165 struct rpc_xprt *xprt = &transport->xprt;
2166 struct socket *sock;
2167 int status = -EIO;
2168
2169 sock = xs_create_sock(xprt, transport,
2170 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2171 IPPROTO_UDP, false);
2172 if (IS_ERR(sock))
2173 goto out;
2174
2175 dprintk("RPC: worker connecting xprt %p via %s to "
2176 "%s (port %s)\n", xprt,
2177 xprt->address_strings[RPC_DISPLAY_PROTO],
2178 xprt->address_strings[RPC_DISPLAY_ADDR],
2179 xprt->address_strings[RPC_DISPLAY_PORT]);
2180
2181 xs_udp_finish_connecting(xprt, sock);
2182 trace_rpc_socket_connect(xprt, sock, 0);
2183 status = 0;
2184out:
2185 xprt_clear_connecting(xprt);
2186 xprt_unlock_connect(xprt, transport);
2187 xprt_wake_pending_tasks(xprt, status);
2188}
2189
2190/**
2191 * xs_tcp_shutdown - gracefully shut down a TCP socket
2192 * @xprt: transport
2193 *
2194 * Initiates a graceful shutdown of the TCP socket by calling the
2195 * equivalent of shutdown(SHUT_RDWR);
2196 */
2197static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2198{
2199 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2200 struct socket *sock = transport->sock;
2201 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2202
2203 if (sock == NULL)
2204 return;
2205 switch (skst) {
2206 default:
2207 kernel_sock_shutdown(sock, SHUT_RDWR);
2208 trace_rpc_socket_shutdown(xprt, sock);
2209 break;
2210 case TCP_CLOSE:
2211 case TCP_TIME_WAIT:
2212 xs_reset_transport(transport);
2213 }
2214}
2215
2216static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2217 struct socket *sock)
2218{
2219 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2220 unsigned int keepidle;
2221 unsigned int keepcnt;
2222 unsigned int opt_on = 1;
2223 unsigned int timeo;
2224
2225 spin_lock(&xprt->transport_lock);
2226 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2227 keepcnt = xprt->timeout->to_retries + 1;
2228 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2229 (xprt->timeout->to_retries + 1);
2230 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2231 spin_unlock(&xprt->transport_lock);
2232
2233 /* TCP Keepalive options */
2234 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2235 (char *)&opt_on, sizeof(opt_on));
2236 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2237 (char *)&keepidle, sizeof(keepidle));
2238 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2239 (char *)&keepidle, sizeof(keepidle));
2240 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2241 (char *)&keepcnt, sizeof(keepcnt));
2242
2243 /* TCP user timeout (see RFC5482) */
2244 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2245 (char *)&timeo, sizeof(timeo));
2246}
2247
2248static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2249 unsigned long connect_timeout,
2250 unsigned long reconnect_timeout)
2251{
2252 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2253 struct rpc_timeout to;
2254 unsigned long initval;
2255
2256 spin_lock(&xprt->transport_lock);
2257 if (reconnect_timeout < xprt->max_reconnect_timeout)
2258 xprt->max_reconnect_timeout = reconnect_timeout;
2259 if (connect_timeout < xprt->connect_timeout) {
2260 memcpy(&to, xprt->timeout, sizeof(to));
2261 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2262 /* Arbitrary lower limit */
2263 if (initval < XS_TCP_INIT_REEST_TO << 1)
2264 initval = XS_TCP_INIT_REEST_TO << 1;
2265 to.to_initval = initval;
2266 to.to_maxval = initval;
2267 memcpy(&transport->tcp_timeout, &to,
2268 sizeof(transport->tcp_timeout));
2269 xprt->timeout = &transport->tcp_timeout;
2270 xprt->connect_timeout = connect_timeout;
2271 }
2272 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2273 spin_unlock(&xprt->transport_lock);
2274}
2275
2276static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2277{
2278 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2279 int ret = -ENOTCONN;
2280
2281 if (!transport->inet) {
2282 struct sock *sk = sock->sk;
2283 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2284
2285 /* Avoid temporary address, they are bad for long-lived
2286 * connections such as NFS mounts.
2287 * RFC4941, section 3.6 suggests that:
2288 * Individual applications, which have specific
2289 * knowledge about the normal duration of connections,
2290 * MAY override this as appropriate.
2291 */
2292 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2293 (char *)&addr_pref, sizeof(addr_pref));
2294
2295 xs_tcp_set_socket_timeouts(xprt, sock);
2296
2297 write_lock_bh(&sk->sk_callback_lock);
2298
2299 xs_save_old_callbacks(transport, sk);
2300
2301 sk->sk_user_data = xprt;
2302 sk->sk_data_ready = xs_data_ready;
2303 sk->sk_state_change = xs_tcp_state_change;
2304 sk->sk_write_space = xs_tcp_write_space;
2305 sock_set_flag(sk, SOCK_FASYNC);
2306 sk->sk_error_report = xs_error_report;
2307
2308 /* socket options */
2309 sock_reset_flag(sk, SOCK_LINGER);
2310 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2311
2312 xprt_clear_connected(xprt);
2313
2314 /* Reset to new socket */
2315 transport->sock = sock;
2316 transport->inet = sk;
2317
2318 write_unlock_bh(&sk->sk_callback_lock);
2319 }
2320
2321 if (!xprt_bound(xprt))
2322 goto out;
2323
2324 xs_set_memalloc(xprt);
2325
2326 xs_stream_start_connect(transport);
2327
2328 /* Tell the socket layer to start connecting... */
2329 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2330 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2331 switch (ret) {
2332 case 0:
2333 xs_set_srcport(transport, sock);
2334 /* fall through */
2335 case -EINPROGRESS:
2336 /* SYN_SENT! */
2337 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2338 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2339 break;
2340 case -EADDRNOTAVAIL:
2341 /* Source port number is unavailable. Try a new one! */
2342 transport->srcport = 0;
2343 }
2344out:
2345 return ret;
2346}
2347
2348/**
2349 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2350 * @work: queued work item
2351 *
2352 * Invoked by a work queue tasklet.
2353 */
2354static void xs_tcp_setup_socket(struct work_struct *work)
2355{
2356 struct sock_xprt *transport =
2357 container_of(work, struct sock_xprt, connect_worker.work);
2358 struct socket *sock = transport->sock;
2359 struct rpc_xprt *xprt = &transport->xprt;
2360 int status = -EIO;
2361
2362 if (!sock) {
2363 sock = xs_create_sock(xprt, transport,
2364 xs_addr(xprt)->sa_family, SOCK_STREAM,
2365 IPPROTO_TCP, true);
2366 if (IS_ERR(sock)) {
2367 status = PTR_ERR(sock);
2368 goto out;
2369 }
2370 }
2371
2372 dprintk("RPC: worker connecting xprt %p via %s to "
2373 "%s (port %s)\n", xprt,
2374 xprt->address_strings[RPC_DISPLAY_PROTO],
2375 xprt->address_strings[RPC_DISPLAY_ADDR],
2376 xprt->address_strings[RPC_DISPLAY_PORT]);
2377
2378 status = xs_tcp_finish_connecting(xprt, sock);
2379 trace_rpc_socket_connect(xprt, sock, status);
2380 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2381 xprt, -status, xprt_connected(xprt),
2382 sock->sk->sk_state);
2383 switch (status) {
2384 default:
2385 printk("%s: connect returned unhandled error %d\n",
2386 __func__, status);
2387 /* fall through */
2388 case -EADDRNOTAVAIL:
2389 /* We're probably in TIME_WAIT. Get rid of existing socket,
2390 * and retry
2391 */
2392 xs_tcp_force_close(xprt);
2393 break;
2394 case 0:
2395 case -EINPROGRESS:
2396 case -EALREADY:
2397 xprt_unlock_connect(xprt, transport);
2398 return;
2399 case -EINVAL:
2400 /* Happens, for instance, if the user specified a link
2401 * local IPv6 address without a scope-id.
2402 */
2403 case -ECONNREFUSED:
2404 case -ECONNRESET:
2405 case -ENETDOWN:
2406 case -ENETUNREACH:
2407 case -EHOSTUNREACH:
2408 case -EADDRINUSE:
2409 case -ENOBUFS:
2410 /*
2411 * xs_tcp_force_close() wakes tasks with -EIO.
2412 * We need to wake them first to ensure the
2413 * correct error code.
2414 */
2415 xprt_wake_pending_tasks(xprt, status);
2416 xs_tcp_force_close(xprt);
2417 goto out;
2418 }
2419 status = -EAGAIN;
2420out:
2421 xprt_clear_connecting(xprt);
2422 xprt_unlock_connect(xprt, transport);
2423 xprt_wake_pending_tasks(xprt, status);
2424}
2425
2426/**
2427 * xs_connect - connect a socket to a remote endpoint
2428 * @xprt: pointer to transport structure
2429 * @task: address of RPC task that manages state of connect request
2430 *
2431 * TCP: If the remote end dropped the connection, delay reconnecting.
2432 *
2433 * UDP socket connects are synchronous, but we use a work queue anyway
2434 * to guarantee that even unprivileged user processes can set up a
2435 * socket on a privileged port.
2436 *
2437 * If a UDP socket connect fails, the delay behavior here prevents
2438 * retry floods (hard mounts).
2439 */
2440static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2441{
2442 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2443 unsigned long delay = 0;
2444
2445 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2446
2447 if (transport->sock != NULL) {
2448 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2449 "seconds\n",
2450 xprt, xprt->reestablish_timeout / HZ);
2451
2452 /* Start by resetting any existing state */
2453 xs_reset_transport(transport);
2454
2455 delay = xprt_reconnect_delay(xprt);
2456 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2457
2458 } else
2459 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2460
2461 queue_delayed_work(xprtiod_workqueue,
2462 &transport->connect_worker,
2463 delay);
2464}
2465
2466static void xs_wake_disconnect(struct sock_xprt *transport)
2467{
2468 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2469 xs_tcp_force_close(&transport->xprt);
2470}
2471
2472static void xs_wake_write(struct sock_xprt *transport)
2473{
2474 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2475 xprt_write_space(&transport->xprt);
2476}
2477
2478static void xs_wake_error(struct sock_xprt *transport)
2479{
2480 int sockerr;
2481
2482 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2483 return;
2484 mutex_lock(&transport->recv_mutex);
2485 if (transport->sock == NULL)
2486 goto out;
2487 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2488 goto out;
2489 sockerr = xchg(&transport->xprt_err, 0);
2490 if (sockerr < 0)
2491 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2492out:
2493 mutex_unlock(&transport->recv_mutex);
2494}
2495
2496static void xs_wake_pending(struct sock_xprt *transport)
2497{
2498 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2499 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2500}
2501
2502static void xs_error_handle(struct work_struct *work)
2503{
2504 struct sock_xprt *transport = container_of(work,
2505 struct sock_xprt, error_worker);
2506
2507 xs_wake_disconnect(transport);
2508 xs_wake_write(transport);
2509 xs_wake_error(transport);
2510 xs_wake_pending(transport);
2511}
2512
2513/**
2514 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2515 * @xprt: rpc_xprt struct containing statistics
2516 * @seq: output file
2517 *
2518 */
2519static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2520{
2521 long idle_time = 0;
2522
2523 if (xprt_connected(xprt))
2524 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2525
2526 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2527 "%llu %llu %lu %llu %llu\n",
2528 xprt->stat.bind_count,
2529 xprt->stat.connect_count,
2530 xprt->stat.connect_time / HZ,
2531 idle_time,
2532 xprt->stat.sends,
2533 xprt->stat.recvs,
2534 xprt->stat.bad_xids,
2535 xprt->stat.req_u,
2536 xprt->stat.bklog_u,
2537 xprt->stat.max_slots,
2538 xprt->stat.sending_u,
2539 xprt->stat.pending_u);
2540}
2541
2542/**
2543 * xs_udp_print_stats - display UDP socket-specifc stats
2544 * @xprt: rpc_xprt struct containing statistics
2545 * @seq: output file
2546 *
2547 */
2548static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2549{
2550 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2551
2552 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2553 "%lu %llu %llu\n",
2554 transport->srcport,
2555 xprt->stat.bind_count,
2556 xprt->stat.sends,
2557 xprt->stat.recvs,
2558 xprt->stat.bad_xids,
2559 xprt->stat.req_u,
2560 xprt->stat.bklog_u,
2561 xprt->stat.max_slots,
2562 xprt->stat.sending_u,
2563 xprt->stat.pending_u);
2564}
2565
2566/**
2567 * xs_tcp_print_stats - display TCP socket-specifc stats
2568 * @xprt: rpc_xprt struct containing statistics
2569 * @seq: output file
2570 *
2571 */
2572static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2573{
2574 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2575 long idle_time = 0;
2576
2577 if (xprt_connected(xprt))
2578 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2579
2580 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2581 "%llu %llu %lu %llu %llu\n",
2582 transport->srcport,
2583 xprt->stat.bind_count,
2584 xprt->stat.connect_count,
2585 xprt->stat.connect_time / HZ,
2586 idle_time,
2587 xprt->stat.sends,
2588 xprt->stat.recvs,
2589 xprt->stat.bad_xids,
2590 xprt->stat.req_u,
2591 xprt->stat.bklog_u,
2592 xprt->stat.max_slots,
2593 xprt->stat.sending_u,
2594 xprt->stat.pending_u);
2595}
2596
2597/*
2598 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2599 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2600 * to use the server side send routines.
2601 */
2602static int bc_malloc(struct rpc_task *task)
2603{
2604 struct rpc_rqst *rqst = task->tk_rqstp;
2605 size_t size = rqst->rq_callsize;
2606 struct page *page;
2607 struct rpc_buffer *buf;
2608
2609 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2610 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2611 size);
2612 return -EINVAL;
2613 }
2614
2615 page = alloc_page(GFP_KERNEL);
2616 if (!page)
2617 return -ENOMEM;
2618
2619 buf = page_address(page);
2620 buf->len = PAGE_SIZE;
2621
2622 rqst->rq_buffer = buf->data;
2623 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2624 return 0;
2625}
2626
2627/*
2628 * Free the space allocated in the bc_alloc routine
2629 */
2630static void bc_free(struct rpc_task *task)
2631{
2632 void *buffer = task->tk_rqstp->rq_buffer;
2633 struct rpc_buffer *buf;
2634
2635 buf = container_of(buffer, struct rpc_buffer, data);
2636 free_page((unsigned long)buf);
2637}
2638
2639/*
2640 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2641 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2642 */
2643static int bc_sendto(struct rpc_rqst *req)
2644{
2645 int len;
2646 struct xdr_buf *xbufp = &req->rq_snd_buf;
2647 struct sock_xprt *transport =
2648 container_of(req->rq_xprt, struct sock_xprt, xprt);
2649 unsigned long headoff;
2650 unsigned long tailoff;
2651 struct page *tailpage;
2652 struct msghdr msg = {
2653 .msg_flags = MSG_MORE
2654 };
2655 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2656 (u32)xbufp->len);
2657 struct kvec iov = {
2658 .iov_base = &marker,
2659 .iov_len = sizeof(marker),
2660 };
2661
2662 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len);
2663 if (len != iov.iov_len)
2664 return -EAGAIN;
2665
2666 tailpage = NULL;
2667 if (xbufp->tail[0].iov_len)
2668 tailpage = virt_to_page(xbufp->tail[0].iov_base);
2669 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2670 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2671 len = svc_send_common(transport->sock, xbufp,
2672 virt_to_page(xbufp->head[0].iov_base), headoff,
2673 tailpage, tailoff);
2674 if (len != xbufp->len)
2675 return -EAGAIN;
2676 return len;
2677}
2678
2679/*
2680 * The send routine. Borrows from svc_send
2681 */
2682static int bc_send_request(struct rpc_rqst *req)
2683{
2684 struct svc_xprt *xprt;
2685 int len;
2686
2687 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2688 /*
2689 * Get the server socket associated with this callback xprt
2690 */
2691 xprt = req->rq_xprt->bc_xprt;
2692
2693 /*
2694 * Grab the mutex to serialize data as the connection is shared
2695 * with the fore channel
2696 */
2697 mutex_lock(&xprt->xpt_mutex);
2698 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2699 len = -ENOTCONN;
2700 else
2701 len = bc_sendto(req);
2702 mutex_unlock(&xprt->xpt_mutex);
2703
2704 if (len > 0)
2705 len = 0;
2706
2707 return len;
2708}
2709
2710/*
2711 * The close routine. Since this is client initiated, we do nothing
2712 */
2713
2714static void bc_close(struct rpc_xprt *xprt)
2715{
2716}
2717
2718/*
2719 * The xprt destroy routine. Again, because this connection is client
2720 * initiated, we do nothing
2721 */
2722
2723static void bc_destroy(struct rpc_xprt *xprt)
2724{
2725 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2726
2727 xs_xprt_free(xprt);
2728 module_put(THIS_MODULE);
2729}
2730
2731static const struct rpc_xprt_ops xs_local_ops = {
2732 .reserve_xprt = xprt_reserve_xprt,
2733 .release_xprt = xprt_release_xprt,
2734 .alloc_slot = xprt_alloc_slot,
2735 .free_slot = xprt_free_slot,
2736 .rpcbind = xs_local_rpcbind,
2737 .set_port = xs_local_set_port,
2738 .connect = xs_local_connect,
2739 .buf_alloc = rpc_malloc,
2740 .buf_free = rpc_free,
2741 .prepare_request = xs_stream_prepare_request,
2742 .send_request = xs_local_send_request,
2743 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2744 .close = xs_close,
2745 .destroy = xs_destroy,
2746 .print_stats = xs_local_print_stats,
2747 .enable_swap = xs_enable_swap,
2748 .disable_swap = xs_disable_swap,
2749};
2750
2751static const struct rpc_xprt_ops xs_udp_ops = {
2752 .set_buffer_size = xs_udp_set_buffer_size,
2753 .reserve_xprt = xprt_reserve_xprt_cong,
2754 .release_xprt = xprt_release_xprt_cong,
2755 .alloc_slot = xprt_alloc_slot,
2756 .free_slot = xprt_free_slot,
2757 .rpcbind = rpcb_getport_async,
2758 .set_port = xs_set_port,
2759 .connect = xs_connect,
2760 .buf_alloc = rpc_malloc,
2761 .buf_free = rpc_free,
2762 .send_request = xs_udp_send_request,
2763 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2764 .timer = xs_udp_timer,
2765 .release_request = xprt_release_rqst_cong,
2766 .close = xs_close,
2767 .destroy = xs_destroy,
2768 .print_stats = xs_udp_print_stats,
2769 .enable_swap = xs_enable_swap,
2770 .disable_swap = xs_disable_swap,
2771 .inject_disconnect = xs_inject_disconnect,
2772};
2773
2774static const struct rpc_xprt_ops xs_tcp_ops = {
2775 .reserve_xprt = xprt_reserve_xprt,
2776 .release_xprt = xprt_release_xprt,
2777 .alloc_slot = xprt_alloc_slot,
2778 .free_slot = xprt_free_slot,
2779 .rpcbind = rpcb_getport_async,
2780 .set_port = xs_set_port,
2781 .connect = xs_connect,
2782 .buf_alloc = rpc_malloc,
2783 .buf_free = rpc_free,
2784 .prepare_request = xs_stream_prepare_request,
2785 .send_request = xs_tcp_send_request,
2786 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2787 .close = xs_tcp_shutdown,
2788 .destroy = xs_destroy,
2789 .set_connect_timeout = xs_tcp_set_connect_timeout,
2790 .print_stats = xs_tcp_print_stats,
2791 .enable_swap = xs_enable_swap,
2792 .disable_swap = xs_disable_swap,
2793 .inject_disconnect = xs_inject_disconnect,
2794#ifdef CONFIG_SUNRPC_BACKCHANNEL
2795 .bc_setup = xprt_setup_bc,
2796 .bc_maxpayload = xs_tcp_bc_maxpayload,
2797 .bc_num_slots = xprt_bc_max_slots,
2798 .bc_free_rqst = xprt_free_bc_rqst,
2799 .bc_destroy = xprt_destroy_bc,
2800#endif
2801};
2802
2803/*
2804 * The rpc_xprt_ops for the server backchannel
2805 */
2806
2807static const struct rpc_xprt_ops bc_tcp_ops = {
2808 .reserve_xprt = xprt_reserve_xprt,
2809 .release_xprt = xprt_release_xprt,
2810 .alloc_slot = xprt_alloc_slot,
2811 .free_slot = xprt_free_slot,
2812 .buf_alloc = bc_malloc,
2813 .buf_free = bc_free,
2814 .send_request = bc_send_request,
2815 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2816 .close = bc_close,
2817 .destroy = bc_destroy,
2818 .print_stats = xs_tcp_print_stats,
2819 .enable_swap = xs_enable_swap,
2820 .disable_swap = xs_disable_swap,
2821 .inject_disconnect = xs_inject_disconnect,
2822};
2823
2824static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2825{
2826 static const struct sockaddr_in sin = {
2827 .sin_family = AF_INET,
2828 .sin_addr.s_addr = htonl(INADDR_ANY),
2829 };
2830 static const struct sockaddr_in6 sin6 = {
2831 .sin6_family = AF_INET6,
2832 .sin6_addr = IN6ADDR_ANY_INIT,
2833 };
2834
2835 switch (family) {
2836 case AF_LOCAL:
2837 break;
2838 case AF_INET:
2839 memcpy(sap, &sin, sizeof(sin));
2840 break;
2841 case AF_INET6:
2842 memcpy(sap, &sin6, sizeof(sin6));
2843 break;
2844 default:
2845 dprintk("RPC: %s: Bad address family\n", __func__);
2846 return -EAFNOSUPPORT;
2847 }
2848 return 0;
2849}
2850
2851static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2852 unsigned int slot_table_size,
2853 unsigned int max_slot_table_size)
2854{
2855 struct rpc_xprt *xprt;
2856 struct sock_xprt *new;
2857
2858 if (args->addrlen > sizeof(xprt->addr)) {
2859 dprintk("RPC: xs_setup_xprt: address too large\n");
2860 return ERR_PTR(-EBADF);
2861 }
2862
2863 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2864 max_slot_table_size);
2865 if (xprt == NULL) {
2866 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2867 "rpc_xprt\n");
2868 return ERR_PTR(-ENOMEM);
2869 }
2870
2871 new = container_of(xprt, struct sock_xprt, xprt);
2872 mutex_init(&new->recv_mutex);
2873 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2874 xprt->addrlen = args->addrlen;
2875 if (args->srcaddr)
2876 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2877 else {
2878 int err;
2879 err = xs_init_anyaddr(args->dstaddr->sa_family,
2880 (struct sockaddr *)&new->srcaddr);
2881 if (err != 0) {
2882 xprt_free(xprt);
2883 return ERR_PTR(err);
2884 }
2885 }
2886
2887 return xprt;
2888}
2889
2890static const struct rpc_timeout xs_local_default_timeout = {
2891 .to_initval = 10 * HZ,
2892 .to_maxval = 10 * HZ,
2893 .to_retries = 2,
2894};
2895
2896/**
2897 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2898 * @args: rpc transport creation arguments
2899 *
2900 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2901 */
2902static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2903{
2904 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2905 struct sock_xprt *transport;
2906 struct rpc_xprt *xprt;
2907 struct rpc_xprt *ret;
2908
2909 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2910 xprt_max_tcp_slot_table_entries);
2911 if (IS_ERR(xprt))
2912 return xprt;
2913 transport = container_of(xprt, struct sock_xprt, xprt);
2914
2915 xprt->prot = 0;
2916 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2917
2918 xprt->bind_timeout = XS_BIND_TO;
2919 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2920 xprt->idle_timeout = XS_IDLE_DISC_TO;
2921
2922 xprt->ops = &xs_local_ops;
2923 xprt->timeout = &xs_local_default_timeout;
2924
2925 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2926 INIT_WORK(&transport->error_worker, xs_error_handle);
2927 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2928
2929 switch (sun->sun_family) {
2930 case AF_LOCAL:
2931 if (sun->sun_path[0] != '/') {
2932 dprintk("RPC: bad AF_LOCAL address: %s\n",
2933 sun->sun_path);
2934 ret = ERR_PTR(-EINVAL);
2935 goto out_err;
2936 }
2937 xprt_set_bound(xprt);
2938 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2939 ret = ERR_PTR(xs_local_setup_socket(transport));
2940 if (ret)
2941 goto out_err;
2942 break;
2943 default:
2944 ret = ERR_PTR(-EAFNOSUPPORT);
2945 goto out_err;
2946 }
2947
2948 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2949 xprt->address_strings[RPC_DISPLAY_ADDR]);
2950
2951 if (try_module_get(THIS_MODULE))
2952 return xprt;
2953 ret = ERR_PTR(-EINVAL);
2954out_err:
2955 xs_xprt_free(xprt);
2956 return ret;
2957}
2958
2959static const struct rpc_timeout xs_udp_default_timeout = {
2960 .to_initval = 5 * HZ,
2961 .to_maxval = 30 * HZ,
2962 .to_increment = 5 * HZ,
2963 .to_retries = 5,
2964};
2965
2966/**
2967 * xs_setup_udp - Set up transport to use a UDP socket
2968 * @args: rpc transport creation arguments
2969 *
2970 */
2971static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2972{
2973 struct sockaddr *addr = args->dstaddr;
2974 struct rpc_xprt *xprt;
2975 struct sock_xprt *transport;
2976 struct rpc_xprt *ret;
2977
2978 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2979 xprt_udp_slot_table_entries);
2980 if (IS_ERR(xprt))
2981 return xprt;
2982 transport = container_of(xprt, struct sock_xprt, xprt);
2983
2984 xprt->prot = IPPROTO_UDP;
2985 /* XXX: header size can vary due to auth type, IPv6, etc. */
2986 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2987
2988 xprt->bind_timeout = XS_BIND_TO;
2989 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2990 xprt->idle_timeout = XS_IDLE_DISC_TO;
2991
2992 xprt->ops = &xs_udp_ops;
2993
2994 xprt->timeout = &xs_udp_default_timeout;
2995
2996 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2997 INIT_WORK(&transport->error_worker, xs_error_handle);
2998 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2999
3000 switch (addr->sa_family) {
3001 case AF_INET:
3002 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3003 xprt_set_bound(xprt);
3004
3005 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3006 break;
3007 case AF_INET6:
3008 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3009 xprt_set_bound(xprt);
3010
3011 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3012 break;
3013 default:
3014 ret = ERR_PTR(-EAFNOSUPPORT);
3015 goto out_err;
3016 }
3017
3018 if (xprt_bound(xprt))
3019 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3020 xprt->address_strings[RPC_DISPLAY_ADDR],
3021 xprt->address_strings[RPC_DISPLAY_PORT],
3022 xprt->address_strings[RPC_DISPLAY_PROTO]);
3023 else
3024 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3025 xprt->address_strings[RPC_DISPLAY_ADDR],
3026 xprt->address_strings[RPC_DISPLAY_PROTO]);
3027
3028 if (try_module_get(THIS_MODULE))
3029 return xprt;
3030 ret = ERR_PTR(-EINVAL);
3031out_err:
3032 xs_xprt_free(xprt);
3033 return ret;
3034}
3035
3036static const struct rpc_timeout xs_tcp_default_timeout = {
3037 .to_initval = 60 * HZ,
3038 .to_maxval = 60 * HZ,
3039 .to_retries = 2,
3040};
3041
3042/**
3043 * xs_setup_tcp - Set up transport to use a TCP socket
3044 * @args: rpc transport creation arguments
3045 *
3046 */
3047static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3048{
3049 struct sockaddr *addr = args->dstaddr;
3050 struct rpc_xprt *xprt;
3051 struct sock_xprt *transport;
3052 struct rpc_xprt *ret;
3053 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3054
3055 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3056 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3057
3058 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3059 max_slot_table_size);
3060 if (IS_ERR(xprt))
3061 return xprt;
3062 transport = container_of(xprt, struct sock_xprt, xprt);
3063
3064 xprt->prot = IPPROTO_TCP;
3065 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3066
3067 xprt->bind_timeout = XS_BIND_TO;
3068 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3069 xprt->idle_timeout = XS_IDLE_DISC_TO;
3070
3071 xprt->ops = &xs_tcp_ops;
3072 xprt->timeout = &xs_tcp_default_timeout;
3073
3074 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3075 xprt->connect_timeout = xprt->timeout->to_initval *
3076 (xprt->timeout->to_retries + 1);
3077
3078 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3079 INIT_WORK(&transport->error_worker, xs_error_handle);
3080 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3081
3082 switch (addr->sa_family) {
3083 case AF_INET:
3084 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3085 xprt_set_bound(xprt);
3086
3087 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3088 break;
3089 case AF_INET6:
3090 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3091 xprt_set_bound(xprt);
3092
3093 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3094 break;
3095 default:
3096 ret = ERR_PTR(-EAFNOSUPPORT);
3097 goto out_err;
3098 }
3099
3100 if (xprt_bound(xprt))
3101 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3102 xprt->address_strings[RPC_DISPLAY_ADDR],
3103 xprt->address_strings[RPC_DISPLAY_PORT],
3104 xprt->address_strings[RPC_DISPLAY_PROTO]);
3105 else
3106 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3107 xprt->address_strings[RPC_DISPLAY_ADDR],
3108 xprt->address_strings[RPC_DISPLAY_PROTO]);
3109
3110 if (try_module_get(THIS_MODULE))
3111 return xprt;
3112 ret = ERR_PTR(-EINVAL);
3113out_err:
3114 xs_xprt_free(xprt);
3115 return ret;
3116}
3117
3118/**
3119 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3120 * @args: rpc transport creation arguments
3121 *
3122 */
3123static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3124{
3125 struct sockaddr *addr = args->dstaddr;
3126 struct rpc_xprt *xprt;
3127 struct sock_xprt *transport;
3128 struct svc_sock *bc_sock;
3129 struct rpc_xprt *ret;
3130
3131 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3132 xprt_tcp_slot_table_entries);
3133 if (IS_ERR(xprt))
3134 return xprt;
3135 transport = container_of(xprt, struct sock_xprt, xprt);
3136
3137 xprt->prot = IPPROTO_TCP;
3138 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3139 xprt->timeout = &xs_tcp_default_timeout;
3140
3141 /* backchannel */
3142 xprt_set_bound(xprt);
3143 xprt->bind_timeout = 0;
3144 xprt->reestablish_timeout = 0;
3145 xprt->idle_timeout = 0;
3146
3147 xprt->ops = &bc_tcp_ops;
3148
3149 switch (addr->sa_family) {
3150 case AF_INET:
3151 xs_format_peer_addresses(xprt, "tcp",
3152 RPCBIND_NETID_TCP);
3153 break;
3154 case AF_INET6:
3155 xs_format_peer_addresses(xprt, "tcp",
3156 RPCBIND_NETID_TCP6);
3157 break;
3158 default:
3159 ret = ERR_PTR(-EAFNOSUPPORT);
3160 goto out_err;
3161 }
3162
3163 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3164 xprt->address_strings[RPC_DISPLAY_ADDR],
3165 xprt->address_strings[RPC_DISPLAY_PORT],
3166 xprt->address_strings[RPC_DISPLAY_PROTO]);
3167
3168 /*
3169 * Once we've associated a backchannel xprt with a connection,
3170 * we want to keep it around as long as the connection lasts,
3171 * in case we need to start using it for a backchannel again;
3172 * this reference won't be dropped until bc_xprt is destroyed.
3173 */
3174 xprt_get(xprt);
3175 args->bc_xprt->xpt_bc_xprt = xprt;
3176 xprt->bc_xprt = args->bc_xprt;
3177 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3178 transport->sock = bc_sock->sk_sock;
3179 transport->inet = bc_sock->sk_sk;
3180
3181 /*
3182 * Since we don't want connections for the backchannel, we set
3183 * the xprt status to connected
3184 */
3185 xprt_set_connected(xprt);
3186
3187 if (try_module_get(THIS_MODULE))
3188 return xprt;
3189
3190 args->bc_xprt->xpt_bc_xprt = NULL;
3191 args->bc_xprt->xpt_bc_xps = NULL;
3192 xprt_put(xprt);
3193 ret = ERR_PTR(-EINVAL);
3194out_err:
3195 xs_xprt_free(xprt);
3196 return ret;
3197}
3198
3199static struct xprt_class xs_local_transport = {
3200 .list = LIST_HEAD_INIT(xs_local_transport.list),
3201 .name = "named UNIX socket",
3202 .owner = THIS_MODULE,
3203 .ident = XPRT_TRANSPORT_LOCAL,
3204 .setup = xs_setup_local,
3205};
3206
3207static struct xprt_class xs_udp_transport = {
3208 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3209 .name = "udp",
3210 .owner = THIS_MODULE,
3211 .ident = XPRT_TRANSPORT_UDP,
3212 .setup = xs_setup_udp,
3213};
3214
3215static struct xprt_class xs_tcp_transport = {
3216 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3217 .name = "tcp",
3218 .owner = THIS_MODULE,
3219 .ident = XPRT_TRANSPORT_TCP,
3220 .setup = xs_setup_tcp,
3221};
3222
3223static struct xprt_class xs_bc_tcp_transport = {
3224 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3225 .name = "tcp NFSv4.1 backchannel",
3226 .owner = THIS_MODULE,
3227 .ident = XPRT_TRANSPORT_BC_TCP,
3228 .setup = xs_setup_bc_tcp,
3229};
3230
3231/**
3232 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3233 *
3234 */
3235int init_socket_xprt(void)
3236{
3237 if (!sunrpc_table_header)
3238 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3239
3240 xprt_register_transport(&xs_local_transport);
3241 xprt_register_transport(&xs_udp_transport);
3242 xprt_register_transport(&xs_tcp_transport);
3243 xprt_register_transport(&xs_bc_tcp_transport);
3244
3245 return 0;
3246}
3247
3248/**
3249 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3250 *
3251 */
3252void cleanup_socket_xprt(void)
3253{
3254 if (sunrpc_table_header) {
3255 unregister_sysctl_table(sunrpc_table_header);
3256 sunrpc_table_header = NULL;
3257 }
3258
3259 xprt_unregister_transport(&xs_local_transport);
3260 xprt_unregister_transport(&xs_udp_transport);
3261 xprt_unregister_transport(&xs_tcp_transport);
3262 xprt_unregister_transport(&xs_bc_tcp_transport);
3263}
3264
3265static int param_set_uint_minmax(const char *val,
3266 const struct kernel_param *kp,
3267 unsigned int min, unsigned int max)
3268{
3269 unsigned int num;
3270 int ret;
3271
3272 if (!val)
3273 return -EINVAL;
3274 ret = kstrtouint(val, 0, &num);
3275 if (ret)
3276 return ret;
3277 if (num < min || num > max)
3278 return -EINVAL;
3279 *((unsigned int *)kp->arg) = num;
3280 return 0;
3281}
3282
3283static int param_set_portnr(const char *val, const struct kernel_param *kp)
3284{
3285 return param_set_uint_minmax(val, kp,
3286 RPC_MIN_RESVPORT,
3287 RPC_MAX_RESVPORT);
3288}
3289
3290static const struct kernel_param_ops param_ops_portnr = {
3291 .set = param_set_portnr,
3292 .get = param_get_uint,
3293};
3294
3295#define param_check_portnr(name, p) \
3296 __param_check(name, p, unsigned int);
3297
3298module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3299module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3300
3301static int param_set_slot_table_size(const char *val,
3302 const struct kernel_param *kp)
3303{
3304 return param_set_uint_minmax(val, kp,
3305 RPC_MIN_SLOT_TABLE,
3306 RPC_MAX_SLOT_TABLE);
3307}
3308
3309static const struct kernel_param_ops param_ops_slot_table_size = {
3310 .set = param_set_slot_table_size,
3311 .get = param_get_uint,
3312};
3313
3314#define param_check_slot_table_size(name, p) \
3315 __param_check(name, p, unsigned int);
3316
3317static int param_set_max_slot_table_size(const char *val,
3318 const struct kernel_param *kp)
3319{
3320 return param_set_uint_minmax(val, kp,
3321 RPC_MIN_SLOT_TABLE,
3322 RPC_MAX_SLOT_TABLE_LIMIT);
3323}
3324
3325static const struct kernel_param_ops param_ops_max_slot_table_size = {
3326 .set = param_set_max_slot_table_size,
3327 .get = param_get_uint,
3328};
3329
3330#define param_check_max_slot_table_size(name, p) \
3331 __param_check(name, p, unsigned int);
3332
3333module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3334 slot_table_size, 0644);
3335module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3336 max_slot_table_size, 0644);
3337module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3338 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/sched.h>
37#include <linux/sunrpc/svcsock.h>
38#include <linux/sunrpc/xprtsock.h>
39#include <linux/file.h>
40#ifdef CONFIG_SUNRPC_BACKCHANNEL
41#include <linux/sunrpc/bc_xprt.h>
42#endif
43
44#include <net/sock.h>
45#include <net/checksum.h>
46#include <net/udp.h>
47#include <net/tcp.h>
48
49#include "sunrpc.h"
50
51static void xs_close(struct rpc_xprt *xprt);
52
53/*
54 * xprtsock tunables
55 */
56unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
59
60unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
62
63#define XS_TCP_LINGER_TO (15U * HZ)
64static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
65
66/*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75#ifdef RPC_DEBUG
76
77static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
79static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
80static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83static struct ctl_table_header *sunrpc_table_header;
84
85/*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89static ctl_table xs_tunables_table[] = {
90 {
91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_minmax,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
117 {
118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_jiffies,
141 },
142 { },
143};
144
145static ctl_table sunrpc_table[] = {
146 {
147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
151 { },
152};
153
154#endif
155
156/*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159#define XS_BIND_TO (60U * HZ)
160
161/*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165#define XS_UDP_REEST_TO (2U * HZ)
166
167/*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176#define XS_TCP_INIT_REEST_TO (3U * HZ)
177#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179/*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184#define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
186#ifdef RPC_DEBUG
187# undef RPC_DEBUG_DATA
188# define RPCDBG_FACILITY RPCDBG_TRANS
189#endif
190
191#ifdef RPC_DEBUG_DATA
192static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
193{
194 u8 *buf = (u8 *) packet;
195 int j;
196
197 dprintk("RPC: %s\n", msg);
198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208}
209#else
210static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
211{
212 /* NOP */
213}
214#endif
215
216struct sock_xprt {
217 struct rpc_xprt xprt;
218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
229 tcp_xid,
230 tcp_calldir;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 void (*old_error_report)(struct sock *);
258};
259
260/*
261 * TCP receive state flags
262 */
263#define TCP_RCV_LAST_FRAG (1UL << 0)
264#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265#define TCP_RCV_COPY_XID (1UL << 2)
266#define TCP_RCV_COPY_DATA (1UL << 3)
267#define TCP_RCV_READ_CALLDIR (1UL << 4)
268#define TCP_RCV_COPY_CALLDIR (1UL << 5)
269
270/*
271 * TCP RPC flags
272 */
273#define TCP_RPC_REPLY (1UL << 6)
274
275static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276{
277 return (struct sockaddr *) &xprt->addr;
278}
279
280static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281{
282 return (struct sockaddr_un *) &xprt->addr;
283}
284
285static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
286{
287 return (struct sockaddr_in *) &xprt->addr;
288}
289
290static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291{
292 return (struct sockaddr_in6 *) &xprt->addr;
293}
294
295static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
296{
297 struct sockaddr *sap = xs_addr(xprt);
298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
300 struct sockaddr_un *sun;
301 char buf[128];
302
303 switch (sap->sa_family) {
304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
310 case AF_INET:
311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
314 sin = xs_addr_in(xprt);
315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
316 break;
317 case AF_INET6:
318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
321 sin6 = xs_addr_in6(xprt);
322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
323 break;
324 default:
325 BUG();
326 }
327
328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
329}
330
331static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
332{
333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
335
336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
338
339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341}
342
343static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
346{
347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
349 xs_format_common_peer_addresses(xprt);
350 xs_format_common_peer_ports(xprt);
351}
352
353static void xs_update_peer_port(struct rpc_xprt *xprt)
354{
355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
357
358 xs_format_common_peer_ports(xprt);
359}
360
361static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362{
363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
373}
374
375#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
377static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
378{
379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
387 };
388
389 if (iov.iov_len != 0)
390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392}
393
394static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
395{
396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
407
408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
423}
424
425/**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
433 */
434static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
435{
436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
438
439 if (unlikely(!sock))
440 return -ENOTSOCK;
441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
447
448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
453 goto out;
454 sent += err;
455 base = 0;
456 } else
457 base -= xdr->head[0].iov_len;
458
459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
464 goto out;
465 sent += err;
466 base = 0;
467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
473out:
474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
479}
480
481static void xs_nospace_callback(struct rpc_task *task)
482{
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487}
488
489/**
490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
492 *
493 */
494static int xs_nospace(struct rpc_task *task)
495{
496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
499 int ret = 0;
500
501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 ret = -EAGAIN;
512 /*
513 * Notify TCP that we're limited by the application
514 * window size
515 */
516 set_bit(SOCK_NOSPACE, &transport->sock->flags);
517 transport->inet->sk_write_pending++;
518 /* ...and wait for more buffer space */
519 xprt_wait_for_buffer_space(task, xs_nospace_callback);
520 }
521 } else {
522 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
523 ret = -ENOTCONN;
524 }
525
526 spin_unlock_bh(&xprt->transport_lock);
527 return ret;
528}
529
530/*
531 * Construct a stream transport record marker in @buf.
532 */
533static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
534{
535 u32 reclen = buf->len - sizeof(rpc_fraghdr);
536 rpc_fraghdr *base = buf->head[0].iov_base;
537 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
538}
539
540/**
541 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
542 * @task: RPC task that manages the state of an RPC request
543 *
544 * Return values:
545 * 0: The request has been sent
546 * EAGAIN: The socket was blocked, please call again later to
547 * complete the request
548 * ENOTCONN: Caller needs to invoke connect logic then call again
549 * other: Some other error occured, the request was not sent
550 */
551static int xs_local_send_request(struct rpc_task *task)
552{
553 struct rpc_rqst *req = task->tk_rqstp;
554 struct rpc_xprt *xprt = req->rq_xprt;
555 struct sock_xprt *transport =
556 container_of(xprt, struct sock_xprt, xprt);
557 struct xdr_buf *xdr = &req->rq_snd_buf;
558 int status;
559
560 xs_encode_stream_record_marker(&req->rq_snd_buf);
561
562 xs_pktdump("packet data:",
563 req->rq_svec->iov_base, req->rq_svec->iov_len);
564
565 status = xs_sendpages(transport->sock, NULL, 0,
566 xdr, req->rq_bytes_sent);
567 dprintk("RPC: %s(%u) = %d\n",
568 __func__, xdr->len - req->rq_bytes_sent, status);
569 if (likely(status >= 0)) {
570 req->rq_bytes_sent += status;
571 req->rq_xmit_bytes_sent += status;
572 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
573 req->rq_bytes_sent = 0;
574 return 0;
575 }
576 status = -EAGAIN;
577 }
578
579 switch (status) {
580 case -EAGAIN:
581 status = xs_nospace(task);
582 break;
583 default:
584 dprintk("RPC: sendmsg returned unrecognized error %d\n",
585 -status);
586 case -EPIPE:
587 xs_close(xprt);
588 status = -ENOTCONN;
589 }
590
591 return status;
592}
593
594/**
595 * xs_udp_send_request - write an RPC request to a UDP socket
596 * @task: address of RPC task that manages the state of an RPC request
597 *
598 * Return values:
599 * 0: The request has been sent
600 * EAGAIN: The socket was blocked, please call again later to
601 * complete the request
602 * ENOTCONN: Caller needs to invoke connect logic then call again
603 * other: Some other error occurred, the request was not sent
604 */
605static int xs_udp_send_request(struct rpc_task *task)
606{
607 struct rpc_rqst *req = task->tk_rqstp;
608 struct rpc_xprt *xprt = req->rq_xprt;
609 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
610 struct xdr_buf *xdr = &req->rq_snd_buf;
611 int status;
612
613 xs_pktdump("packet data:",
614 req->rq_svec->iov_base,
615 req->rq_svec->iov_len);
616
617 if (!xprt_bound(xprt))
618 return -ENOTCONN;
619 status = xs_sendpages(transport->sock,
620 xs_addr(xprt),
621 xprt->addrlen, xdr,
622 req->rq_bytes_sent);
623
624 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
625 xdr->len - req->rq_bytes_sent, status);
626
627 if (status >= 0) {
628 req->rq_xmit_bytes_sent += status;
629 if (status >= req->rq_slen)
630 return 0;
631 /* Still some bytes left; set up for a retry later. */
632 status = -EAGAIN;
633 }
634
635 switch (status) {
636 case -ENOTSOCK:
637 status = -ENOTCONN;
638 /* Should we call xs_close() here? */
639 break;
640 case -EAGAIN:
641 status = xs_nospace(task);
642 break;
643 default:
644 dprintk("RPC: sendmsg returned unrecognized error %d\n",
645 -status);
646 case -ENETUNREACH:
647 case -EPIPE:
648 case -ECONNREFUSED:
649 /* When the server has died, an ICMP port unreachable message
650 * prompts ECONNREFUSED. */
651 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
652 }
653
654 return status;
655}
656
657/**
658 * xs_tcp_shutdown - gracefully shut down a TCP socket
659 * @xprt: transport
660 *
661 * Initiates a graceful shutdown of the TCP socket by calling the
662 * equivalent of shutdown(SHUT_WR);
663 */
664static void xs_tcp_shutdown(struct rpc_xprt *xprt)
665{
666 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
667 struct socket *sock = transport->sock;
668
669 if (sock != NULL)
670 kernel_sock_shutdown(sock, SHUT_WR);
671}
672
673/**
674 * xs_tcp_send_request - write an RPC request to a TCP socket
675 * @task: address of RPC task that manages the state of an RPC request
676 *
677 * Return values:
678 * 0: The request has been sent
679 * EAGAIN: The socket was blocked, please call again later to
680 * complete the request
681 * ENOTCONN: Caller needs to invoke connect logic then call again
682 * other: Some other error occurred, the request was not sent
683 *
684 * XXX: In the case of soft timeouts, should we eventually give up
685 * if sendmsg is not able to make progress?
686 */
687static int xs_tcp_send_request(struct rpc_task *task)
688{
689 struct rpc_rqst *req = task->tk_rqstp;
690 struct rpc_xprt *xprt = req->rq_xprt;
691 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
692 struct xdr_buf *xdr = &req->rq_snd_buf;
693 int status;
694
695 xs_encode_stream_record_marker(&req->rq_snd_buf);
696
697 xs_pktdump("packet data:",
698 req->rq_svec->iov_base,
699 req->rq_svec->iov_len);
700
701 /* Continue transmitting the packet/record. We must be careful
702 * to cope with writespace callbacks arriving _after_ we have
703 * called sendmsg(). */
704 while (1) {
705 status = xs_sendpages(transport->sock,
706 NULL, 0, xdr, req->rq_bytes_sent);
707
708 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
709 xdr->len - req->rq_bytes_sent, status);
710
711 if (unlikely(status < 0))
712 break;
713
714 /* If we've sent the entire packet, immediately
715 * reset the count of bytes sent. */
716 req->rq_bytes_sent += status;
717 req->rq_xmit_bytes_sent += status;
718 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
719 req->rq_bytes_sent = 0;
720 return 0;
721 }
722
723 if (status != 0)
724 continue;
725 status = -EAGAIN;
726 break;
727 }
728
729 switch (status) {
730 case -ENOTSOCK:
731 status = -ENOTCONN;
732 /* Should we call xs_close() here? */
733 break;
734 case -EAGAIN:
735 status = xs_nospace(task);
736 break;
737 default:
738 dprintk("RPC: sendmsg returned unrecognized error %d\n",
739 -status);
740 case -ECONNRESET:
741 case -EPIPE:
742 xs_tcp_shutdown(xprt);
743 case -ECONNREFUSED:
744 case -ENOTCONN:
745 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
746 }
747
748 return status;
749}
750
751/**
752 * xs_tcp_release_xprt - clean up after a tcp transmission
753 * @xprt: transport
754 * @task: rpc task
755 *
756 * This cleans up if an error causes us to abort the transmission of a request.
757 * In this case, the socket may need to be reset in order to avoid confusing
758 * the server.
759 */
760static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
761{
762 struct rpc_rqst *req;
763
764 if (task != xprt->snd_task)
765 return;
766 if (task == NULL)
767 goto out_release;
768 req = task->tk_rqstp;
769 if (req == NULL)
770 goto out_release;
771 if (req->rq_bytes_sent == 0)
772 goto out_release;
773 if (req->rq_bytes_sent == req->rq_snd_buf.len)
774 goto out_release;
775 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
776out_release:
777 xprt_release_xprt(xprt, task);
778}
779
780static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
781{
782 transport->old_data_ready = sk->sk_data_ready;
783 transport->old_state_change = sk->sk_state_change;
784 transport->old_write_space = sk->sk_write_space;
785 transport->old_error_report = sk->sk_error_report;
786}
787
788static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
789{
790 sk->sk_data_ready = transport->old_data_ready;
791 sk->sk_state_change = transport->old_state_change;
792 sk->sk_write_space = transport->old_write_space;
793 sk->sk_error_report = transport->old_error_report;
794}
795
796static void xs_reset_transport(struct sock_xprt *transport)
797{
798 struct socket *sock = transport->sock;
799 struct sock *sk = transport->inet;
800
801 if (sk == NULL)
802 return;
803
804 transport->srcport = 0;
805
806 write_lock_bh(&sk->sk_callback_lock);
807 transport->inet = NULL;
808 transport->sock = NULL;
809
810 sk->sk_user_data = NULL;
811
812 xs_restore_old_callbacks(transport, sk);
813 write_unlock_bh(&sk->sk_callback_lock);
814
815 sk->sk_no_check = 0;
816
817 sock_release(sock);
818}
819
820/**
821 * xs_close - close a socket
822 * @xprt: transport
823 *
824 * This is used when all requests are complete; ie, no DRC state remains
825 * on the server we want to save.
826 *
827 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
828 * xs_reset_transport() zeroing the socket from underneath a writer.
829 */
830static void xs_close(struct rpc_xprt *xprt)
831{
832 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
833
834 dprintk("RPC: xs_close xprt %p\n", xprt);
835
836 xs_reset_transport(transport);
837 xprt->reestablish_timeout = 0;
838
839 smp_mb__before_clear_bit();
840 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
841 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
842 clear_bit(XPRT_CLOSING, &xprt->state);
843 smp_mb__after_clear_bit();
844 xprt_disconnect_done(xprt);
845}
846
847static void xs_tcp_close(struct rpc_xprt *xprt)
848{
849 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
850 xs_close(xprt);
851 else
852 xs_tcp_shutdown(xprt);
853}
854
855/**
856 * xs_destroy - prepare to shutdown a transport
857 * @xprt: doomed transport
858 *
859 */
860static void xs_destroy(struct rpc_xprt *xprt)
861{
862 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
863
864 dprintk("RPC: xs_destroy xprt %p\n", xprt);
865
866 cancel_delayed_work_sync(&transport->connect_worker);
867
868 xs_close(xprt);
869 xs_free_peer_addresses(xprt);
870 xprt_free(xprt);
871 module_put(THIS_MODULE);
872}
873
874static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
875{
876 return (struct rpc_xprt *) sk->sk_user_data;
877}
878
879static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
880{
881 struct xdr_skb_reader desc = {
882 .skb = skb,
883 .offset = sizeof(rpc_fraghdr),
884 .count = skb->len - sizeof(rpc_fraghdr),
885 };
886
887 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
888 return -1;
889 if (desc.count)
890 return -1;
891 return 0;
892}
893
894/**
895 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
896 * @sk: socket with data to read
897 * @len: how much data to read
898 *
899 * Currently this assumes we can read the whole reply in a single gulp.
900 */
901static void xs_local_data_ready(struct sock *sk, int len)
902{
903 struct rpc_task *task;
904 struct rpc_xprt *xprt;
905 struct rpc_rqst *rovr;
906 struct sk_buff *skb;
907 int err, repsize, copied;
908 u32 _xid;
909 __be32 *xp;
910
911 read_lock_bh(&sk->sk_callback_lock);
912 dprintk("RPC: %s...\n", __func__);
913 xprt = xprt_from_sock(sk);
914 if (xprt == NULL)
915 goto out;
916
917 skb = skb_recv_datagram(sk, 0, 1, &err);
918 if (skb == NULL)
919 goto out;
920
921 if (xprt->shutdown)
922 goto dropit;
923
924 repsize = skb->len - sizeof(rpc_fraghdr);
925 if (repsize < 4) {
926 dprintk("RPC: impossible RPC reply size %d\n", repsize);
927 goto dropit;
928 }
929
930 /* Copy the XID from the skb... */
931 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
932 if (xp == NULL)
933 goto dropit;
934
935 /* Look up and lock the request corresponding to the given XID */
936 spin_lock(&xprt->transport_lock);
937 rovr = xprt_lookup_rqst(xprt, *xp);
938 if (!rovr)
939 goto out_unlock;
940 task = rovr->rq_task;
941
942 copied = rovr->rq_private_buf.buflen;
943 if (copied > repsize)
944 copied = repsize;
945
946 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
947 dprintk("RPC: sk_buff copy failed\n");
948 goto out_unlock;
949 }
950
951 xprt_complete_rqst(task, copied);
952
953 out_unlock:
954 spin_unlock(&xprt->transport_lock);
955 dropit:
956 skb_free_datagram(sk, skb);
957 out:
958 read_unlock_bh(&sk->sk_callback_lock);
959}
960
961/**
962 * xs_udp_data_ready - "data ready" callback for UDP sockets
963 * @sk: socket with data to read
964 * @len: how much data to read
965 *
966 */
967static void xs_udp_data_ready(struct sock *sk, int len)
968{
969 struct rpc_task *task;
970 struct rpc_xprt *xprt;
971 struct rpc_rqst *rovr;
972 struct sk_buff *skb;
973 int err, repsize, copied;
974 u32 _xid;
975 __be32 *xp;
976
977 read_lock_bh(&sk->sk_callback_lock);
978 dprintk("RPC: xs_udp_data_ready...\n");
979 if (!(xprt = xprt_from_sock(sk)))
980 goto out;
981
982 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
983 goto out;
984
985 if (xprt->shutdown)
986 goto dropit;
987
988 repsize = skb->len - sizeof(struct udphdr);
989 if (repsize < 4) {
990 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
991 goto dropit;
992 }
993
994 /* Copy the XID from the skb... */
995 xp = skb_header_pointer(skb, sizeof(struct udphdr),
996 sizeof(_xid), &_xid);
997 if (xp == NULL)
998 goto dropit;
999
1000 /* Look up and lock the request corresponding to the given XID */
1001 spin_lock(&xprt->transport_lock);
1002 rovr = xprt_lookup_rqst(xprt, *xp);
1003 if (!rovr)
1004 goto out_unlock;
1005 task = rovr->rq_task;
1006
1007 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1008 copied = repsize;
1009
1010 /* Suck it into the iovec, verify checksum if not done by hw. */
1011 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1012 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1013 goto out_unlock;
1014 }
1015
1016 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1017
1018 /* Something worked... */
1019 dst_confirm(skb_dst(skb));
1020
1021 xprt_adjust_cwnd(task, copied);
1022 xprt_complete_rqst(task, copied);
1023
1024 out_unlock:
1025 spin_unlock(&xprt->transport_lock);
1026 dropit:
1027 skb_free_datagram(sk, skb);
1028 out:
1029 read_unlock_bh(&sk->sk_callback_lock);
1030}
1031
1032static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1033{
1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1035 size_t len, used;
1036 char *p;
1037
1038 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1039 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1040 used = xdr_skb_read_bits(desc, p, len);
1041 transport->tcp_offset += used;
1042 if (used != len)
1043 return;
1044
1045 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1046 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1047 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1048 else
1049 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1050 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1051
1052 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1053 transport->tcp_offset = 0;
1054
1055 /* Sanity check of the record length */
1056 if (unlikely(transport->tcp_reclen < 8)) {
1057 dprintk("RPC: invalid TCP record fragment length\n");
1058 xprt_force_disconnect(xprt);
1059 return;
1060 }
1061 dprintk("RPC: reading TCP record fragment of length %d\n",
1062 transport->tcp_reclen);
1063}
1064
1065static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1066{
1067 if (transport->tcp_offset == transport->tcp_reclen) {
1068 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1069 transport->tcp_offset = 0;
1070 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1071 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1072 transport->tcp_flags |= TCP_RCV_COPY_XID;
1073 transport->tcp_copied = 0;
1074 }
1075 }
1076}
1077
1078static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1079{
1080 size_t len, used;
1081 char *p;
1082
1083 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1084 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1085 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1086 used = xdr_skb_read_bits(desc, p, len);
1087 transport->tcp_offset += used;
1088 if (used != len)
1089 return;
1090 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1091 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1092 transport->tcp_copied = 4;
1093 dprintk("RPC: reading %s XID %08x\n",
1094 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1095 : "request with",
1096 ntohl(transport->tcp_xid));
1097 xs_tcp_check_fraghdr(transport);
1098}
1099
1100static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1101 struct xdr_skb_reader *desc)
1102{
1103 size_t len, used;
1104 u32 offset;
1105 char *p;
1106
1107 /*
1108 * We want transport->tcp_offset to be 8 at the end of this routine
1109 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1110 * When this function is called for the first time,
1111 * transport->tcp_offset is 4 (after having already read the xid).
1112 */
1113 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1114 len = sizeof(transport->tcp_calldir) - offset;
1115 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1116 p = ((char *) &transport->tcp_calldir) + offset;
1117 used = xdr_skb_read_bits(desc, p, len);
1118 transport->tcp_offset += used;
1119 if (used != len)
1120 return;
1121 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1122 /*
1123 * We don't yet have the XDR buffer, so we will write the calldir
1124 * out after we get the buffer from the 'struct rpc_rqst'
1125 */
1126 switch (ntohl(transport->tcp_calldir)) {
1127 case RPC_REPLY:
1128 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1129 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1130 transport->tcp_flags |= TCP_RPC_REPLY;
1131 break;
1132 case RPC_CALL:
1133 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1134 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1135 transport->tcp_flags &= ~TCP_RPC_REPLY;
1136 break;
1137 default:
1138 dprintk("RPC: invalid request message type\n");
1139 xprt_force_disconnect(&transport->xprt);
1140 }
1141 xs_tcp_check_fraghdr(transport);
1142}
1143
1144static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1145 struct xdr_skb_reader *desc,
1146 struct rpc_rqst *req)
1147{
1148 struct sock_xprt *transport =
1149 container_of(xprt, struct sock_xprt, xprt);
1150 struct xdr_buf *rcvbuf;
1151 size_t len;
1152 ssize_t r;
1153
1154 rcvbuf = &req->rq_private_buf;
1155
1156 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1157 /*
1158 * Save the RPC direction in the XDR buffer
1159 */
1160 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1161 &transport->tcp_calldir,
1162 sizeof(transport->tcp_calldir));
1163 transport->tcp_copied += sizeof(transport->tcp_calldir);
1164 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1165 }
1166
1167 len = desc->count;
1168 if (len > transport->tcp_reclen - transport->tcp_offset) {
1169 struct xdr_skb_reader my_desc;
1170
1171 len = transport->tcp_reclen - transport->tcp_offset;
1172 memcpy(&my_desc, desc, sizeof(my_desc));
1173 my_desc.count = len;
1174 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1175 &my_desc, xdr_skb_read_bits);
1176 desc->count -= r;
1177 desc->offset += r;
1178 } else
1179 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1180 desc, xdr_skb_read_bits);
1181
1182 if (r > 0) {
1183 transport->tcp_copied += r;
1184 transport->tcp_offset += r;
1185 }
1186 if (r != len) {
1187 /* Error when copying to the receive buffer,
1188 * usually because we weren't able to allocate
1189 * additional buffer pages. All we can do now
1190 * is turn off TCP_RCV_COPY_DATA, so the request
1191 * will not receive any additional updates,
1192 * and time out.
1193 * Any remaining data from this record will
1194 * be discarded.
1195 */
1196 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1197 dprintk("RPC: XID %08x truncated request\n",
1198 ntohl(transport->tcp_xid));
1199 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1200 "tcp_offset = %u, tcp_reclen = %u\n",
1201 xprt, transport->tcp_copied,
1202 transport->tcp_offset, transport->tcp_reclen);
1203 return;
1204 }
1205
1206 dprintk("RPC: XID %08x read %Zd bytes\n",
1207 ntohl(transport->tcp_xid), r);
1208 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1209 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1210 transport->tcp_offset, transport->tcp_reclen);
1211
1212 if (transport->tcp_copied == req->rq_private_buf.buflen)
1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1214 else if (transport->tcp_offset == transport->tcp_reclen) {
1215 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1216 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1217 }
1218}
1219
1220/*
1221 * Finds the request corresponding to the RPC xid and invokes the common
1222 * tcp read code to read the data.
1223 */
1224static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1225 struct xdr_skb_reader *desc)
1226{
1227 struct sock_xprt *transport =
1228 container_of(xprt, struct sock_xprt, xprt);
1229 struct rpc_rqst *req;
1230
1231 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1232
1233 /* Find and lock the request corresponding to this xid */
1234 spin_lock(&xprt->transport_lock);
1235 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1236 if (!req) {
1237 dprintk("RPC: XID %08x request not found!\n",
1238 ntohl(transport->tcp_xid));
1239 spin_unlock(&xprt->transport_lock);
1240 return -1;
1241 }
1242
1243 xs_tcp_read_common(xprt, desc, req);
1244
1245 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1246 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1247
1248 spin_unlock(&xprt->transport_lock);
1249 return 0;
1250}
1251
1252#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1253/*
1254 * Obtains an rpc_rqst previously allocated and invokes the common
1255 * tcp read code to read the data. The result is placed in the callback
1256 * queue.
1257 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1258 * connection and return -1.
1259 */
1260static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1261 struct xdr_skb_reader *desc)
1262{
1263 struct sock_xprt *transport =
1264 container_of(xprt, struct sock_xprt, xprt);
1265 struct rpc_rqst *req;
1266
1267 req = xprt_alloc_bc_request(xprt);
1268 if (req == NULL) {
1269 printk(KERN_WARNING "Callback slot table overflowed\n");
1270 xprt_force_disconnect(xprt);
1271 return -1;
1272 }
1273
1274 req->rq_xid = transport->tcp_xid;
1275 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1276 xs_tcp_read_common(xprt, desc, req);
1277
1278 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1279 struct svc_serv *bc_serv = xprt->bc_serv;
1280
1281 /*
1282 * Add callback request to callback list. The callback
1283 * service sleeps on the sv_cb_waitq waiting for new
1284 * requests. Wake it up after adding enqueing the
1285 * request.
1286 */
1287 dprintk("RPC: add callback request to list\n");
1288 spin_lock(&bc_serv->sv_cb_lock);
1289 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1290 spin_unlock(&bc_serv->sv_cb_lock);
1291 wake_up(&bc_serv->sv_cb_waitq);
1292 }
1293
1294 req->rq_private_buf.len = transport->tcp_copied;
1295
1296 return 0;
1297}
1298
1299static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1300 struct xdr_skb_reader *desc)
1301{
1302 struct sock_xprt *transport =
1303 container_of(xprt, struct sock_xprt, xprt);
1304
1305 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1306 xs_tcp_read_reply(xprt, desc) :
1307 xs_tcp_read_callback(xprt, desc);
1308}
1309#else
1310static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1311 struct xdr_skb_reader *desc)
1312{
1313 return xs_tcp_read_reply(xprt, desc);
1314}
1315#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1316
1317/*
1318 * Read data off the transport. This can be either an RPC_CALL or an
1319 * RPC_REPLY. Relay the processing to helper functions.
1320 */
1321static void xs_tcp_read_data(struct rpc_xprt *xprt,
1322 struct xdr_skb_reader *desc)
1323{
1324 struct sock_xprt *transport =
1325 container_of(xprt, struct sock_xprt, xprt);
1326
1327 if (_xs_tcp_read_data(xprt, desc) == 0)
1328 xs_tcp_check_fraghdr(transport);
1329 else {
1330 /*
1331 * The transport_lock protects the request handling.
1332 * There's no need to hold it to update the tcp_flags.
1333 */
1334 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1335 }
1336}
1337
1338static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1339{
1340 size_t len;
1341
1342 len = transport->tcp_reclen - transport->tcp_offset;
1343 if (len > desc->count)
1344 len = desc->count;
1345 desc->count -= len;
1346 desc->offset += len;
1347 transport->tcp_offset += len;
1348 dprintk("RPC: discarded %Zu bytes\n", len);
1349 xs_tcp_check_fraghdr(transport);
1350}
1351
1352static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1353{
1354 struct rpc_xprt *xprt = rd_desc->arg.data;
1355 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1356 struct xdr_skb_reader desc = {
1357 .skb = skb,
1358 .offset = offset,
1359 .count = len,
1360 };
1361
1362 dprintk("RPC: xs_tcp_data_recv started\n");
1363 do {
1364 /* Read in a new fragment marker if necessary */
1365 /* Can we ever really expect to get completely empty fragments? */
1366 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1367 xs_tcp_read_fraghdr(xprt, &desc);
1368 continue;
1369 }
1370 /* Read in the xid if necessary */
1371 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1372 xs_tcp_read_xid(transport, &desc);
1373 continue;
1374 }
1375 /* Read in the call/reply flag */
1376 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1377 xs_tcp_read_calldir(transport, &desc);
1378 continue;
1379 }
1380 /* Read in the request data */
1381 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1382 xs_tcp_read_data(xprt, &desc);
1383 continue;
1384 }
1385 /* Skip over any trailing bytes on short reads */
1386 xs_tcp_read_discard(transport, &desc);
1387 } while (desc.count);
1388 dprintk("RPC: xs_tcp_data_recv done\n");
1389 return len - desc.count;
1390}
1391
1392/**
1393 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1394 * @sk: socket with data to read
1395 * @bytes: how much data to read
1396 *
1397 */
1398static void xs_tcp_data_ready(struct sock *sk, int bytes)
1399{
1400 struct rpc_xprt *xprt;
1401 read_descriptor_t rd_desc;
1402 int read;
1403
1404 dprintk("RPC: xs_tcp_data_ready...\n");
1405
1406 read_lock_bh(&sk->sk_callback_lock);
1407 if (!(xprt = xprt_from_sock(sk)))
1408 goto out;
1409 if (xprt->shutdown)
1410 goto out;
1411
1412 /* Any data means we had a useful conversation, so
1413 * the we don't need to delay the next reconnect
1414 */
1415 if (xprt->reestablish_timeout)
1416 xprt->reestablish_timeout = 0;
1417
1418 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1419 rd_desc.arg.data = xprt;
1420 do {
1421 rd_desc.count = 65536;
1422 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1423 } while (read > 0);
1424out:
1425 read_unlock_bh(&sk->sk_callback_lock);
1426}
1427
1428/*
1429 * Do the equivalent of linger/linger2 handling for dealing with
1430 * broken servers that don't close the socket in a timely
1431 * fashion
1432 */
1433static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1434 unsigned long timeout)
1435{
1436 struct sock_xprt *transport;
1437
1438 if (xprt_test_and_set_connecting(xprt))
1439 return;
1440 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1441 transport = container_of(xprt, struct sock_xprt, xprt);
1442 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1443 timeout);
1444}
1445
1446static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1447{
1448 struct sock_xprt *transport;
1449
1450 transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1453 !cancel_delayed_work(&transport->connect_worker))
1454 return;
1455 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1456 xprt_clear_connecting(xprt);
1457}
1458
1459static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1460{
1461 smp_mb__before_clear_bit();
1462 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1463 clear_bit(XPRT_CLOSING, &xprt->state);
1464 smp_mb__after_clear_bit();
1465 /* Mark transport as closed and wake up all pending tasks */
1466 xprt_disconnect_done(xprt);
1467}
1468
1469/**
1470 * xs_tcp_state_change - callback to handle TCP socket state changes
1471 * @sk: socket whose state has changed
1472 *
1473 */
1474static void xs_tcp_state_change(struct sock *sk)
1475{
1476 struct rpc_xprt *xprt;
1477
1478 read_lock_bh(&sk->sk_callback_lock);
1479 if (!(xprt = xprt_from_sock(sk)))
1480 goto out;
1481 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1482 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1483 sk->sk_state, xprt_connected(xprt),
1484 sock_flag(sk, SOCK_DEAD),
1485 sock_flag(sk, SOCK_ZAPPED),
1486 sk->sk_shutdown);
1487
1488 switch (sk->sk_state) {
1489 case TCP_ESTABLISHED:
1490 spin_lock(&xprt->transport_lock);
1491 if (!xprt_test_and_set_connected(xprt)) {
1492 struct sock_xprt *transport = container_of(xprt,
1493 struct sock_xprt, xprt);
1494
1495 /* Reset TCP record info */
1496 transport->tcp_offset = 0;
1497 transport->tcp_reclen = 0;
1498 transport->tcp_copied = 0;
1499 transport->tcp_flags =
1500 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1501
1502 xprt_wake_pending_tasks(xprt, -EAGAIN);
1503 }
1504 spin_unlock(&xprt->transport_lock);
1505 break;
1506 case TCP_FIN_WAIT1:
1507 /* The client initiated a shutdown of the socket */
1508 xprt->connect_cookie++;
1509 xprt->reestablish_timeout = 0;
1510 set_bit(XPRT_CLOSING, &xprt->state);
1511 smp_mb__before_clear_bit();
1512 clear_bit(XPRT_CONNECTED, &xprt->state);
1513 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1514 smp_mb__after_clear_bit();
1515 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1516 break;
1517 case TCP_CLOSE_WAIT:
1518 /* The server initiated a shutdown of the socket */
1519 xprt_force_disconnect(xprt);
1520 xprt->connect_cookie++;
1521 case TCP_CLOSING:
1522 /*
1523 * If the server closed down the connection, make sure that
1524 * we back off before reconnecting
1525 */
1526 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1527 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1528 break;
1529 case TCP_LAST_ACK:
1530 set_bit(XPRT_CLOSING, &xprt->state);
1531 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1532 smp_mb__before_clear_bit();
1533 clear_bit(XPRT_CONNECTED, &xprt->state);
1534 smp_mb__after_clear_bit();
1535 break;
1536 case TCP_CLOSE:
1537 xs_tcp_cancel_linger_timeout(xprt);
1538 xs_sock_mark_closed(xprt);
1539 }
1540 out:
1541 read_unlock_bh(&sk->sk_callback_lock);
1542}
1543
1544/**
1545 * xs_error_report - callback mainly for catching socket errors
1546 * @sk: socket
1547 */
1548static void xs_error_report(struct sock *sk)
1549{
1550 struct rpc_xprt *xprt;
1551
1552 read_lock_bh(&sk->sk_callback_lock);
1553 if (!(xprt = xprt_from_sock(sk)))
1554 goto out;
1555 dprintk("RPC: %s client %p...\n"
1556 "RPC: error %d\n",
1557 __func__, xprt, sk->sk_err);
1558 xprt_wake_pending_tasks(xprt, -EAGAIN);
1559out:
1560 read_unlock_bh(&sk->sk_callback_lock);
1561}
1562
1563static void xs_write_space(struct sock *sk)
1564{
1565 struct socket *sock;
1566 struct rpc_xprt *xprt;
1567
1568 if (unlikely(!(sock = sk->sk_socket)))
1569 return;
1570 clear_bit(SOCK_NOSPACE, &sock->flags);
1571
1572 if (unlikely(!(xprt = xprt_from_sock(sk))))
1573 return;
1574 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1575 return;
1576
1577 xprt_write_space(xprt);
1578}
1579
1580/**
1581 * xs_udp_write_space - callback invoked when socket buffer space
1582 * becomes available
1583 * @sk: socket whose state has changed
1584 *
1585 * Called when more output buffer space is available for this socket.
1586 * We try not to wake our writers until they can make "significant"
1587 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1588 * with a bunch of small requests.
1589 */
1590static void xs_udp_write_space(struct sock *sk)
1591{
1592 read_lock_bh(&sk->sk_callback_lock);
1593
1594 /* from net/core/sock.c:sock_def_write_space */
1595 if (sock_writeable(sk))
1596 xs_write_space(sk);
1597
1598 read_unlock_bh(&sk->sk_callback_lock);
1599}
1600
1601/**
1602 * xs_tcp_write_space - callback invoked when socket buffer space
1603 * becomes available
1604 * @sk: socket whose state has changed
1605 *
1606 * Called when more output buffer space is available for this socket.
1607 * We try not to wake our writers until they can make "significant"
1608 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1609 * with a bunch of small requests.
1610 */
1611static void xs_tcp_write_space(struct sock *sk)
1612{
1613 read_lock_bh(&sk->sk_callback_lock);
1614
1615 /* from net/core/stream.c:sk_stream_write_space */
1616 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1617 xs_write_space(sk);
1618
1619 read_unlock_bh(&sk->sk_callback_lock);
1620}
1621
1622static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1623{
1624 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1625 struct sock *sk = transport->inet;
1626
1627 if (transport->rcvsize) {
1628 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1629 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1630 }
1631 if (transport->sndsize) {
1632 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1633 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1634 sk->sk_write_space(sk);
1635 }
1636}
1637
1638/**
1639 * xs_udp_set_buffer_size - set send and receive limits
1640 * @xprt: generic transport
1641 * @sndsize: requested size of send buffer, in bytes
1642 * @rcvsize: requested size of receive buffer, in bytes
1643 *
1644 * Set socket send and receive buffer size limits.
1645 */
1646static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1647{
1648 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1649
1650 transport->sndsize = 0;
1651 if (sndsize)
1652 transport->sndsize = sndsize + 1024;
1653 transport->rcvsize = 0;
1654 if (rcvsize)
1655 transport->rcvsize = rcvsize + 1024;
1656
1657 xs_udp_do_set_buffer_size(xprt);
1658}
1659
1660/**
1661 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1662 * @task: task that timed out
1663 *
1664 * Adjust the congestion window after a retransmit timeout has occurred.
1665 */
1666static void xs_udp_timer(struct rpc_task *task)
1667{
1668 xprt_adjust_cwnd(task, -ETIMEDOUT);
1669}
1670
1671static unsigned short xs_get_random_port(void)
1672{
1673 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1674 unsigned short rand = (unsigned short) net_random() % range;
1675 return rand + xprt_min_resvport;
1676}
1677
1678/**
1679 * xs_set_port - reset the port number in the remote endpoint address
1680 * @xprt: generic transport
1681 * @port: new port number
1682 *
1683 */
1684static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1685{
1686 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1687
1688 rpc_set_port(xs_addr(xprt), port);
1689 xs_update_peer_port(xprt);
1690}
1691
1692static unsigned short xs_get_srcport(struct sock_xprt *transport)
1693{
1694 unsigned short port = transport->srcport;
1695
1696 if (port == 0 && transport->xprt.resvport)
1697 port = xs_get_random_port();
1698 return port;
1699}
1700
1701static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1702{
1703 if (transport->srcport != 0)
1704 transport->srcport = 0;
1705 if (!transport->xprt.resvport)
1706 return 0;
1707 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1708 return xprt_max_resvport;
1709 return --port;
1710}
1711static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1712{
1713 struct sockaddr_storage myaddr;
1714 int err, nloop = 0;
1715 unsigned short port = xs_get_srcport(transport);
1716 unsigned short last;
1717
1718 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1719 do {
1720 rpc_set_port((struct sockaddr *)&myaddr, port);
1721 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1722 transport->xprt.addrlen);
1723 if (port == 0)
1724 break;
1725 if (err == 0) {
1726 transport->srcport = port;
1727 break;
1728 }
1729 last = port;
1730 port = xs_next_srcport(transport, port);
1731 if (port > last)
1732 nloop++;
1733 } while (err == -EADDRINUSE && nloop != 2);
1734
1735 if (myaddr.ss_family == AF_INET)
1736 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in *)&myaddr)->sin_addr,
1738 port, err ? "failed" : "ok", err);
1739 else
1740 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1741 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1742 port, err ? "failed" : "ok", err);
1743 return err;
1744}
1745
1746/*
1747 * We don't support autobind on AF_LOCAL sockets
1748 */
1749static void xs_local_rpcbind(struct rpc_task *task)
1750{
1751 xprt_set_bound(task->tk_xprt);
1752}
1753
1754static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1755{
1756}
1757
1758#ifdef CONFIG_DEBUG_LOCK_ALLOC
1759static struct lock_class_key xs_key[2];
1760static struct lock_class_key xs_slock_key[2];
1761
1762static inline void xs_reclassify_socketu(struct socket *sock)
1763{
1764 struct sock *sk = sock->sk;
1765
1766 BUG_ON(sock_owned_by_user(sk));
1767 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1768 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1769}
1770
1771static inline void xs_reclassify_socket4(struct socket *sock)
1772{
1773 struct sock *sk = sock->sk;
1774
1775 BUG_ON(sock_owned_by_user(sk));
1776 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1777 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1778}
1779
1780static inline void xs_reclassify_socket6(struct socket *sock)
1781{
1782 struct sock *sk = sock->sk;
1783
1784 BUG_ON(sock_owned_by_user(sk));
1785 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1786 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1787}
1788
1789static inline void xs_reclassify_socket(int family, struct socket *sock)
1790{
1791 switch (family) {
1792 case AF_LOCAL:
1793 xs_reclassify_socketu(sock);
1794 break;
1795 case AF_INET:
1796 xs_reclassify_socket4(sock);
1797 break;
1798 case AF_INET6:
1799 xs_reclassify_socket6(sock);
1800 break;
1801 }
1802}
1803#else
1804static inline void xs_reclassify_socketu(struct socket *sock)
1805{
1806}
1807
1808static inline void xs_reclassify_socket4(struct socket *sock)
1809{
1810}
1811
1812static inline void xs_reclassify_socket6(struct socket *sock)
1813{
1814}
1815
1816static inline void xs_reclassify_socket(int family, struct socket *sock)
1817{
1818}
1819#endif
1820
1821static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1822 struct sock_xprt *transport, int family, int type, int protocol)
1823{
1824 struct socket *sock;
1825 int err;
1826
1827 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1828 if (err < 0) {
1829 dprintk("RPC: can't create %d transport socket (%d).\n",
1830 protocol, -err);
1831 goto out;
1832 }
1833 xs_reclassify_socket(family, sock);
1834
1835 err = xs_bind(transport, sock);
1836 if (err) {
1837 sock_release(sock);
1838 goto out;
1839 }
1840
1841 return sock;
1842out:
1843 return ERR_PTR(err);
1844}
1845
1846static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1847 struct socket *sock)
1848{
1849 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1850 xprt);
1851
1852 if (!transport->inet) {
1853 struct sock *sk = sock->sk;
1854
1855 write_lock_bh(&sk->sk_callback_lock);
1856
1857 xs_save_old_callbacks(transport, sk);
1858
1859 sk->sk_user_data = xprt;
1860 sk->sk_data_ready = xs_local_data_ready;
1861 sk->sk_write_space = xs_udp_write_space;
1862 sk->sk_error_report = xs_error_report;
1863 sk->sk_allocation = GFP_ATOMIC;
1864
1865 xprt_clear_connected(xprt);
1866
1867 /* Reset to new socket */
1868 transport->sock = sock;
1869 transport->inet = sk;
1870
1871 write_unlock_bh(&sk->sk_callback_lock);
1872 }
1873
1874 /* Tell the socket layer to start connecting... */
1875 xprt->stat.connect_count++;
1876 xprt->stat.connect_start = jiffies;
1877 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1878}
1879
1880/**
1881 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1882 * @xprt: RPC transport to connect
1883 * @transport: socket transport to connect
1884 * @create_sock: function to create a socket of the correct type
1885 *
1886 * Invoked by a work queue tasklet.
1887 */
1888static void xs_local_setup_socket(struct work_struct *work)
1889{
1890 struct sock_xprt *transport =
1891 container_of(work, struct sock_xprt, connect_worker.work);
1892 struct rpc_xprt *xprt = &transport->xprt;
1893 struct socket *sock;
1894 int status = -EIO;
1895
1896 if (xprt->shutdown)
1897 goto out;
1898
1899 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1900 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1901 SOCK_STREAM, 0, &sock, 1);
1902 if (status < 0) {
1903 dprintk("RPC: can't create AF_LOCAL "
1904 "transport socket (%d).\n", -status);
1905 goto out;
1906 }
1907 xs_reclassify_socketu(sock);
1908
1909 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1910 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1911
1912 status = xs_local_finish_connecting(xprt, sock);
1913 switch (status) {
1914 case 0:
1915 dprintk("RPC: xprt %p connected to %s\n",
1916 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1917 xprt_set_connected(xprt);
1918 break;
1919 case -ENOENT:
1920 dprintk("RPC: xprt %p: socket %s does not exist\n",
1921 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1922 break;
1923 default:
1924 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1925 __func__, -status,
1926 xprt->address_strings[RPC_DISPLAY_ADDR]);
1927 }
1928
1929out:
1930 xprt_clear_connecting(xprt);
1931 xprt_wake_pending_tasks(xprt, status);
1932}
1933
1934static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1935{
1936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1937
1938 if (!transport->inet) {
1939 struct sock *sk = sock->sk;
1940
1941 write_lock_bh(&sk->sk_callback_lock);
1942
1943 xs_save_old_callbacks(transport, sk);
1944
1945 sk->sk_user_data = xprt;
1946 sk->sk_data_ready = xs_udp_data_ready;
1947 sk->sk_write_space = xs_udp_write_space;
1948 sk->sk_error_report = xs_error_report;
1949 sk->sk_no_check = UDP_CSUM_NORCV;
1950 sk->sk_allocation = GFP_ATOMIC;
1951
1952 xprt_set_connected(xprt);
1953
1954 /* Reset to new socket */
1955 transport->sock = sock;
1956 transport->inet = sk;
1957
1958 write_unlock_bh(&sk->sk_callback_lock);
1959 }
1960 xs_udp_do_set_buffer_size(xprt);
1961}
1962
1963static void xs_udp_setup_socket(struct work_struct *work)
1964{
1965 struct sock_xprt *transport =
1966 container_of(work, struct sock_xprt, connect_worker.work);
1967 struct rpc_xprt *xprt = &transport->xprt;
1968 struct socket *sock = transport->sock;
1969 int status = -EIO;
1970
1971 if (xprt->shutdown)
1972 goto out;
1973
1974 /* Start by resetting any existing state */
1975 xs_reset_transport(transport);
1976 sock = xs_create_sock(xprt, transport,
1977 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1978 if (IS_ERR(sock))
1979 goto out;
1980
1981 dprintk("RPC: worker connecting xprt %p via %s to "
1982 "%s (port %s)\n", xprt,
1983 xprt->address_strings[RPC_DISPLAY_PROTO],
1984 xprt->address_strings[RPC_DISPLAY_ADDR],
1985 xprt->address_strings[RPC_DISPLAY_PORT]);
1986
1987 xs_udp_finish_connecting(xprt, sock);
1988 status = 0;
1989out:
1990 xprt_clear_connecting(xprt);
1991 xprt_wake_pending_tasks(xprt, status);
1992}
1993
1994/*
1995 * We need to preserve the port number so the reply cache on the server can
1996 * find our cached RPC replies when we get around to reconnecting.
1997 */
1998static void xs_abort_connection(struct sock_xprt *transport)
1999{
2000 int result;
2001 struct sockaddr any;
2002
2003 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2004
2005 /*
2006 * Disconnect the transport socket by doing a connect operation
2007 * with AF_UNSPEC. This should return immediately...
2008 */
2009 memset(&any, 0, sizeof(any));
2010 any.sa_family = AF_UNSPEC;
2011 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2012 if (!result)
2013 xs_sock_mark_closed(&transport->xprt);
2014 else
2015 dprintk("RPC: AF_UNSPEC connect return code %d\n",
2016 result);
2017}
2018
2019static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2020{
2021 unsigned int state = transport->inet->sk_state;
2022
2023 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2024 /* we don't need to abort the connection if the socket
2025 * hasn't undergone a shutdown
2026 */
2027 if (transport->inet->sk_shutdown == 0)
2028 return;
2029 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2030 __func__, transport->inet->sk_shutdown);
2031 }
2032 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2033 /* we don't need to abort the connection if the socket
2034 * hasn't undergone a shutdown
2035 */
2036 if (transport->inet->sk_shutdown == 0)
2037 return;
2038 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2039 "sk_shutdown set to %d\n",
2040 __func__, transport->inet->sk_shutdown);
2041 }
2042 xs_abort_connection(transport);
2043}
2044
2045static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2046{
2047 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2048 int ret = -ENOTCONN;
2049
2050 if (!transport->inet) {
2051 struct sock *sk = sock->sk;
2052
2053 write_lock_bh(&sk->sk_callback_lock);
2054
2055 xs_save_old_callbacks(transport, sk);
2056
2057 sk->sk_user_data = xprt;
2058 sk->sk_data_ready = xs_tcp_data_ready;
2059 sk->sk_state_change = xs_tcp_state_change;
2060 sk->sk_write_space = xs_tcp_write_space;
2061 sk->sk_error_report = xs_error_report;
2062 sk->sk_allocation = GFP_ATOMIC;
2063
2064 /* socket options */
2065 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2066 sock_reset_flag(sk, SOCK_LINGER);
2067 tcp_sk(sk)->linger2 = 0;
2068 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2069
2070 xprt_clear_connected(xprt);
2071
2072 /* Reset to new socket */
2073 transport->sock = sock;
2074 transport->inet = sk;
2075
2076 write_unlock_bh(&sk->sk_callback_lock);
2077 }
2078
2079 if (!xprt_bound(xprt))
2080 goto out;
2081
2082 /* Tell the socket layer to start connecting... */
2083 xprt->stat.connect_count++;
2084 xprt->stat.connect_start = jiffies;
2085 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2086 switch (ret) {
2087 case 0:
2088 case -EINPROGRESS:
2089 /* SYN_SENT! */
2090 xprt->connect_cookie++;
2091 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2092 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2093 }
2094out:
2095 return ret;
2096}
2097
2098/**
2099 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2100 * @xprt: RPC transport to connect
2101 * @transport: socket transport to connect
2102 * @create_sock: function to create a socket of the correct type
2103 *
2104 * Invoked by a work queue tasklet.
2105 */
2106static void xs_tcp_setup_socket(struct work_struct *work)
2107{
2108 struct sock_xprt *transport =
2109 container_of(work, struct sock_xprt, connect_worker.work);
2110 struct socket *sock = transport->sock;
2111 struct rpc_xprt *xprt = &transport->xprt;
2112 int status = -EIO;
2113
2114 if (xprt->shutdown)
2115 goto out;
2116
2117 if (!sock) {
2118 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2119 sock = xs_create_sock(xprt, transport,
2120 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2121 if (IS_ERR(sock)) {
2122 status = PTR_ERR(sock);
2123 goto out;
2124 }
2125 } else {
2126 int abort_and_exit;
2127
2128 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2129 &xprt->state);
2130 /* "close" the socket, preserving the local port */
2131 xs_tcp_reuse_connection(transport);
2132
2133 if (abort_and_exit)
2134 goto out_eagain;
2135 }
2136
2137 dprintk("RPC: worker connecting xprt %p via %s to "
2138 "%s (port %s)\n", xprt,
2139 xprt->address_strings[RPC_DISPLAY_PROTO],
2140 xprt->address_strings[RPC_DISPLAY_ADDR],
2141 xprt->address_strings[RPC_DISPLAY_PORT]);
2142
2143 status = xs_tcp_finish_connecting(xprt, sock);
2144 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2145 xprt, -status, xprt_connected(xprt),
2146 sock->sk->sk_state);
2147 switch (status) {
2148 default:
2149 printk("%s: connect returned unhandled error %d\n",
2150 __func__, status);
2151 case -EADDRNOTAVAIL:
2152 /* We're probably in TIME_WAIT. Get rid of existing socket,
2153 * and retry
2154 */
2155 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
2156 xprt_force_disconnect(xprt);
2157 break;
2158 case -ECONNREFUSED:
2159 case -ECONNRESET:
2160 case -ENETUNREACH:
2161 /* retry with existing socket, after a delay */
2162 case 0:
2163 case -EINPROGRESS:
2164 case -EALREADY:
2165 xprt_clear_connecting(xprt);
2166 return;
2167 case -EINVAL:
2168 /* Happens, for instance, if the user specified a link
2169 * local IPv6 address without a scope-id.
2170 */
2171 goto out;
2172 }
2173out_eagain:
2174 status = -EAGAIN;
2175out:
2176 xprt_clear_connecting(xprt);
2177 xprt_wake_pending_tasks(xprt, status);
2178}
2179
2180/**
2181 * xs_connect - connect a socket to a remote endpoint
2182 * @task: address of RPC task that manages state of connect request
2183 *
2184 * TCP: If the remote end dropped the connection, delay reconnecting.
2185 *
2186 * UDP socket connects are synchronous, but we use a work queue anyway
2187 * to guarantee that even unprivileged user processes can set up a
2188 * socket on a privileged port.
2189 *
2190 * If a UDP socket connect fails, the delay behavior here prevents
2191 * retry floods (hard mounts).
2192 */
2193static void xs_connect(struct rpc_task *task)
2194{
2195 struct rpc_xprt *xprt = task->tk_xprt;
2196 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2197
2198 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2199 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2200 "seconds\n",
2201 xprt, xprt->reestablish_timeout / HZ);
2202 queue_delayed_work(rpciod_workqueue,
2203 &transport->connect_worker,
2204 xprt->reestablish_timeout);
2205 xprt->reestablish_timeout <<= 1;
2206 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2207 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2208 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2209 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2210 } else {
2211 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2212 queue_delayed_work(rpciod_workqueue,
2213 &transport->connect_worker, 0);
2214 }
2215}
2216
2217/**
2218 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2219 * @xprt: rpc_xprt struct containing statistics
2220 * @seq: output file
2221 *
2222 */
2223static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2224{
2225 long idle_time = 0;
2226
2227 if (xprt_connected(xprt))
2228 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2229
2230 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2231 "%llu %llu\n",
2232 xprt->stat.bind_count,
2233 xprt->stat.connect_count,
2234 xprt->stat.connect_time,
2235 idle_time,
2236 xprt->stat.sends,
2237 xprt->stat.recvs,
2238 xprt->stat.bad_xids,
2239 xprt->stat.req_u,
2240 xprt->stat.bklog_u);
2241}
2242
2243/**
2244 * xs_udp_print_stats - display UDP socket-specifc stats
2245 * @xprt: rpc_xprt struct containing statistics
2246 * @seq: output file
2247 *
2248 */
2249static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2250{
2251 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2252
2253 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2254 transport->srcport,
2255 xprt->stat.bind_count,
2256 xprt->stat.sends,
2257 xprt->stat.recvs,
2258 xprt->stat.bad_xids,
2259 xprt->stat.req_u,
2260 xprt->stat.bklog_u);
2261}
2262
2263/**
2264 * xs_tcp_print_stats - display TCP socket-specifc stats
2265 * @xprt: rpc_xprt struct containing statistics
2266 * @seq: output file
2267 *
2268 */
2269static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2270{
2271 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2272 long idle_time = 0;
2273
2274 if (xprt_connected(xprt))
2275 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2276
2277 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2278 transport->srcport,
2279 xprt->stat.bind_count,
2280 xprt->stat.connect_count,
2281 xprt->stat.connect_time,
2282 idle_time,
2283 xprt->stat.sends,
2284 xprt->stat.recvs,
2285 xprt->stat.bad_xids,
2286 xprt->stat.req_u,
2287 xprt->stat.bklog_u);
2288}
2289
2290/*
2291 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2292 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2293 * to use the server side send routines.
2294 */
2295static void *bc_malloc(struct rpc_task *task, size_t size)
2296{
2297 struct page *page;
2298 struct rpc_buffer *buf;
2299
2300 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2301 page = alloc_page(GFP_KERNEL);
2302
2303 if (!page)
2304 return NULL;
2305
2306 buf = page_address(page);
2307 buf->len = PAGE_SIZE;
2308
2309 return buf->data;
2310}
2311
2312/*
2313 * Free the space allocated in the bc_alloc routine
2314 */
2315static void bc_free(void *buffer)
2316{
2317 struct rpc_buffer *buf;
2318
2319 if (!buffer)
2320 return;
2321
2322 buf = container_of(buffer, struct rpc_buffer, data);
2323 free_page((unsigned long)buf);
2324}
2325
2326/*
2327 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2328 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2329 */
2330static int bc_sendto(struct rpc_rqst *req)
2331{
2332 int len;
2333 struct xdr_buf *xbufp = &req->rq_snd_buf;
2334 struct rpc_xprt *xprt = req->rq_xprt;
2335 struct sock_xprt *transport =
2336 container_of(xprt, struct sock_xprt, xprt);
2337 struct socket *sock = transport->sock;
2338 unsigned long headoff;
2339 unsigned long tailoff;
2340
2341 xs_encode_stream_record_marker(xbufp);
2342
2343 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2344 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2345 len = svc_send_common(sock, xbufp,
2346 virt_to_page(xbufp->head[0].iov_base), headoff,
2347 xbufp->tail[0].iov_base, tailoff);
2348
2349 if (len != xbufp->len) {
2350 printk(KERN_NOTICE "Error sending entire callback!\n");
2351 len = -EAGAIN;
2352 }
2353
2354 return len;
2355}
2356
2357/*
2358 * The send routine. Borrows from svc_send
2359 */
2360static int bc_send_request(struct rpc_task *task)
2361{
2362 struct rpc_rqst *req = task->tk_rqstp;
2363 struct svc_xprt *xprt;
2364 struct svc_sock *svsk;
2365 u32 len;
2366
2367 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2368 /*
2369 * Get the server socket associated with this callback xprt
2370 */
2371 xprt = req->rq_xprt->bc_xprt;
2372 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2373
2374 /*
2375 * Grab the mutex to serialize data as the connection is shared
2376 * with the fore channel
2377 */
2378 if (!mutex_trylock(&xprt->xpt_mutex)) {
2379 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2380 if (!mutex_trylock(&xprt->xpt_mutex))
2381 return -EAGAIN;
2382 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2383 }
2384 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2385 len = -ENOTCONN;
2386 else
2387 len = bc_sendto(req);
2388 mutex_unlock(&xprt->xpt_mutex);
2389
2390 if (len > 0)
2391 len = 0;
2392
2393 return len;
2394}
2395
2396/*
2397 * The close routine. Since this is client initiated, we do nothing
2398 */
2399
2400static void bc_close(struct rpc_xprt *xprt)
2401{
2402}
2403
2404/*
2405 * The xprt destroy routine. Again, because this connection is client
2406 * initiated, we do nothing
2407 */
2408
2409static void bc_destroy(struct rpc_xprt *xprt)
2410{
2411}
2412
2413static struct rpc_xprt_ops xs_local_ops = {
2414 .reserve_xprt = xprt_reserve_xprt,
2415 .release_xprt = xs_tcp_release_xprt,
2416 .rpcbind = xs_local_rpcbind,
2417 .set_port = xs_local_set_port,
2418 .connect = xs_connect,
2419 .buf_alloc = rpc_malloc,
2420 .buf_free = rpc_free,
2421 .send_request = xs_local_send_request,
2422 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2423 .close = xs_close,
2424 .destroy = xs_destroy,
2425 .print_stats = xs_local_print_stats,
2426};
2427
2428static struct rpc_xprt_ops xs_udp_ops = {
2429 .set_buffer_size = xs_udp_set_buffer_size,
2430 .reserve_xprt = xprt_reserve_xprt_cong,
2431 .release_xprt = xprt_release_xprt_cong,
2432 .rpcbind = rpcb_getport_async,
2433 .set_port = xs_set_port,
2434 .connect = xs_connect,
2435 .buf_alloc = rpc_malloc,
2436 .buf_free = rpc_free,
2437 .send_request = xs_udp_send_request,
2438 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2439 .timer = xs_udp_timer,
2440 .release_request = xprt_release_rqst_cong,
2441 .close = xs_close,
2442 .destroy = xs_destroy,
2443 .print_stats = xs_udp_print_stats,
2444};
2445
2446static struct rpc_xprt_ops xs_tcp_ops = {
2447 .reserve_xprt = xprt_reserve_xprt,
2448 .release_xprt = xs_tcp_release_xprt,
2449 .rpcbind = rpcb_getport_async,
2450 .set_port = xs_set_port,
2451 .connect = xs_connect,
2452 .buf_alloc = rpc_malloc,
2453 .buf_free = rpc_free,
2454 .send_request = xs_tcp_send_request,
2455 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2456 .close = xs_tcp_close,
2457 .destroy = xs_destroy,
2458 .print_stats = xs_tcp_print_stats,
2459};
2460
2461/*
2462 * The rpc_xprt_ops for the server backchannel
2463 */
2464
2465static struct rpc_xprt_ops bc_tcp_ops = {
2466 .reserve_xprt = xprt_reserve_xprt,
2467 .release_xprt = xprt_release_xprt,
2468 .buf_alloc = bc_malloc,
2469 .buf_free = bc_free,
2470 .send_request = bc_send_request,
2471 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2472 .close = bc_close,
2473 .destroy = bc_destroy,
2474 .print_stats = xs_tcp_print_stats,
2475};
2476
2477static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2478{
2479 static const struct sockaddr_in sin = {
2480 .sin_family = AF_INET,
2481 .sin_addr.s_addr = htonl(INADDR_ANY),
2482 };
2483 static const struct sockaddr_in6 sin6 = {
2484 .sin6_family = AF_INET6,
2485 .sin6_addr = IN6ADDR_ANY_INIT,
2486 };
2487
2488 switch (family) {
2489 case AF_LOCAL:
2490 break;
2491 case AF_INET:
2492 memcpy(sap, &sin, sizeof(sin));
2493 break;
2494 case AF_INET6:
2495 memcpy(sap, &sin6, sizeof(sin6));
2496 break;
2497 default:
2498 dprintk("RPC: %s: Bad address family\n", __func__);
2499 return -EAFNOSUPPORT;
2500 }
2501 return 0;
2502}
2503
2504static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2505 unsigned int slot_table_size,
2506 unsigned int max_slot_table_size)
2507{
2508 struct rpc_xprt *xprt;
2509 struct sock_xprt *new;
2510
2511 if (args->addrlen > sizeof(xprt->addr)) {
2512 dprintk("RPC: xs_setup_xprt: address too large\n");
2513 return ERR_PTR(-EBADF);
2514 }
2515
2516 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2517 max_slot_table_size);
2518 if (xprt == NULL) {
2519 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2520 "rpc_xprt\n");
2521 return ERR_PTR(-ENOMEM);
2522 }
2523
2524 new = container_of(xprt, struct sock_xprt, xprt);
2525 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2526 xprt->addrlen = args->addrlen;
2527 if (args->srcaddr)
2528 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2529 else {
2530 int err;
2531 err = xs_init_anyaddr(args->dstaddr->sa_family,
2532 (struct sockaddr *)&new->srcaddr);
2533 if (err != 0)
2534 return ERR_PTR(err);
2535 }
2536
2537 return xprt;
2538}
2539
2540static const struct rpc_timeout xs_local_default_timeout = {
2541 .to_initval = 10 * HZ,
2542 .to_maxval = 10 * HZ,
2543 .to_retries = 2,
2544};
2545
2546/**
2547 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2548 * @args: rpc transport creation arguments
2549 *
2550 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2551 */
2552static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2553{
2554 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2555 struct sock_xprt *transport;
2556 struct rpc_xprt *xprt;
2557 struct rpc_xprt *ret;
2558
2559 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2560 xprt_max_tcp_slot_table_entries);
2561 if (IS_ERR(xprt))
2562 return xprt;
2563 transport = container_of(xprt, struct sock_xprt, xprt);
2564
2565 xprt->prot = 0;
2566 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2567 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2568
2569 xprt->bind_timeout = XS_BIND_TO;
2570 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2571 xprt->idle_timeout = XS_IDLE_DISC_TO;
2572
2573 xprt->ops = &xs_local_ops;
2574 xprt->timeout = &xs_local_default_timeout;
2575
2576 switch (sun->sun_family) {
2577 case AF_LOCAL:
2578 if (sun->sun_path[0] != '/') {
2579 dprintk("RPC: bad AF_LOCAL address: %s\n",
2580 sun->sun_path);
2581 ret = ERR_PTR(-EINVAL);
2582 goto out_err;
2583 }
2584 xprt_set_bound(xprt);
2585 INIT_DELAYED_WORK(&transport->connect_worker,
2586 xs_local_setup_socket);
2587 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2588 break;
2589 default:
2590 ret = ERR_PTR(-EAFNOSUPPORT);
2591 goto out_err;
2592 }
2593
2594 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2595 xprt->address_strings[RPC_DISPLAY_ADDR]);
2596
2597 if (try_module_get(THIS_MODULE))
2598 return xprt;
2599 ret = ERR_PTR(-EINVAL);
2600out_err:
2601 xprt_free(xprt);
2602 return ret;
2603}
2604
2605static const struct rpc_timeout xs_udp_default_timeout = {
2606 .to_initval = 5 * HZ,
2607 .to_maxval = 30 * HZ,
2608 .to_increment = 5 * HZ,
2609 .to_retries = 5,
2610};
2611
2612/**
2613 * xs_setup_udp - Set up transport to use a UDP socket
2614 * @args: rpc transport creation arguments
2615 *
2616 */
2617static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2618{
2619 struct sockaddr *addr = args->dstaddr;
2620 struct rpc_xprt *xprt;
2621 struct sock_xprt *transport;
2622 struct rpc_xprt *ret;
2623
2624 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2625 xprt_udp_slot_table_entries);
2626 if (IS_ERR(xprt))
2627 return xprt;
2628 transport = container_of(xprt, struct sock_xprt, xprt);
2629
2630 xprt->prot = IPPROTO_UDP;
2631 xprt->tsh_size = 0;
2632 /* XXX: header size can vary due to auth type, IPv6, etc. */
2633 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2634
2635 xprt->bind_timeout = XS_BIND_TO;
2636 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2637 xprt->idle_timeout = XS_IDLE_DISC_TO;
2638
2639 xprt->ops = &xs_udp_ops;
2640
2641 xprt->timeout = &xs_udp_default_timeout;
2642
2643 switch (addr->sa_family) {
2644 case AF_INET:
2645 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2646 xprt_set_bound(xprt);
2647
2648 INIT_DELAYED_WORK(&transport->connect_worker,
2649 xs_udp_setup_socket);
2650 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2651 break;
2652 case AF_INET6:
2653 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2654 xprt_set_bound(xprt);
2655
2656 INIT_DELAYED_WORK(&transport->connect_worker,
2657 xs_udp_setup_socket);
2658 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2659 break;
2660 default:
2661 ret = ERR_PTR(-EAFNOSUPPORT);
2662 goto out_err;
2663 }
2664
2665 if (xprt_bound(xprt))
2666 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2667 xprt->address_strings[RPC_DISPLAY_ADDR],
2668 xprt->address_strings[RPC_DISPLAY_PORT],
2669 xprt->address_strings[RPC_DISPLAY_PROTO]);
2670 else
2671 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2672 xprt->address_strings[RPC_DISPLAY_ADDR],
2673 xprt->address_strings[RPC_DISPLAY_PROTO]);
2674
2675 if (try_module_get(THIS_MODULE))
2676 return xprt;
2677 ret = ERR_PTR(-EINVAL);
2678out_err:
2679 xprt_free(xprt);
2680 return ret;
2681}
2682
2683static const struct rpc_timeout xs_tcp_default_timeout = {
2684 .to_initval = 60 * HZ,
2685 .to_maxval = 60 * HZ,
2686 .to_retries = 2,
2687};
2688
2689/**
2690 * xs_setup_tcp - Set up transport to use a TCP socket
2691 * @args: rpc transport creation arguments
2692 *
2693 */
2694static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2695{
2696 struct sockaddr *addr = args->dstaddr;
2697 struct rpc_xprt *xprt;
2698 struct sock_xprt *transport;
2699 struct rpc_xprt *ret;
2700
2701 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2702 xprt_max_tcp_slot_table_entries);
2703 if (IS_ERR(xprt))
2704 return xprt;
2705 transport = container_of(xprt, struct sock_xprt, xprt);
2706
2707 xprt->prot = IPPROTO_TCP;
2708 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2709 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2710
2711 xprt->bind_timeout = XS_BIND_TO;
2712 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2713 xprt->idle_timeout = XS_IDLE_DISC_TO;
2714
2715 xprt->ops = &xs_tcp_ops;
2716 xprt->timeout = &xs_tcp_default_timeout;
2717
2718 switch (addr->sa_family) {
2719 case AF_INET:
2720 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2721 xprt_set_bound(xprt);
2722
2723 INIT_DELAYED_WORK(&transport->connect_worker,
2724 xs_tcp_setup_socket);
2725 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2726 break;
2727 case AF_INET6:
2728 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2729 xprt_set_bound(xprt);
2730
2731 INIT_DELAYED_WORK(&transport->connect_worker,
2732 xs_tcp_setup_socket);
2733 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2734 break;
2735 default:
2736 ret = ERR_PTR(-EAFNOSUPPORT);
2737 goto out_err;
2738 }
2739
2740 if (xprt_bound(xprt))
2741 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2742 xprt->address_strings[RPC_DISPLAY_ADDR],
2743 xprt->address_strings[RPC_DISPLAY_PORT],
2744 xprt->address_strings[RPC_DISPLAY_PROTO]);
2745 else
2746 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2747 xprt->address_strings[RPC_DISPLAY_ADDR],
2748 xprt->address_strings[RPC_DISPLAY_PROTO]);
2749
2750
2751 if (try_module_get(THIS_MODULE))
2752 return xprt;
2753 ret = ERR_PTR(-EINVAL);
2754out_err:
2755 xprt_free(xprt);
2756 return ret;
2757}
2758
2759/**
2760 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2761 * @args: rpc transport creation arguments
2762 *
2763 */
2764static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2765{
2766 struct sockaddr *addr = args->dstaddr;
2767 struct rpc_xprt *xprt;
2768 struct sock_xprt *transport;
2769 struct svc_sock *bc_sock;
2770 struct rpc_xprt *ret;
2771
2772 if (args->bc_xprt->xpt_bc_xprt) {
2773 /*
2774 * This server connection already has a backchannel
2775 * export; we can't create a new one, as we wouldn't be
2776 * able to match replies based on xid any more. So,
2777 * reuse the already-existing one:
2778 */
2779 return args->bc_xprt->xpt_bc_xprt;
2780 }
2781 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2782 xprt_tcp_slot_table_entries);
2783 if (IS_ERR(xprt))
2784 return xprt;
2785 transport = container_of(xprt, struct sock_xprt, xprt);
2786
2787 xprt->prot = IPPROTO_TCP;
2788 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2789 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2790 xprt->timeout = &xs_tcp_default_timeout;
2791
2792 /* backchannel */
2793 xprt_set_bound(xprt);
2794 xprt->bind_timeout = 0;
2795 xprt->reestablish_timeout = 0;
2796 xprt->idle_timeout = 0;
2797
2798 xprt->ops = &bc_tcp_ops;
2799
2800 switch (addr->sa_family) {
2801 case AF_INET:
2802 xs_format_peer_addresses(xprt, "tcp",
2803 RPCBIND_NETID_TCP);
2804 break;
2805 case AF_INET6:
2806 xs_format_peer_addresses(xprt, "tcp",
2807 RPCBIND_NETID_TCP6);
2808 break;
2809 default:
2810 ret = ERR_PTR(-EAFNOSUPPORT);
2811 goto out_err;
2812 }
2813
2814 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2815 xprt->address_strings[RPC_DISPLAY_ADDR],
2816 xprt->address_strings[RPC_DISPLAY_PORT],
2817 xprt->address_strings[RPC_DISPLAY_PROTO]);
2818
2819 /*
2820 * Once we've associated a backchannel xprt with a connection,
2821 * we want to keep it around as long as long as the connection
2822 * lasts, in case we need to start using it for a backchannel
2823 * again; this reference won't be dropped until bc_xprt is
2824 * destroyed.
2825 */
2826 xprt_get(xprt);
2827 args->bc_xprt->xpt_bc_xprt = xprt;
2828 xprt->bc_xprt = args->bc_xprt;
2829 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2830 transport->sock = bc_sock->sk_sock;
2831 transport->inet = bc_sock->sk_sk;
2832
2833 /*
2834 * Since we don't want connections for the backchannel, we set
2835 * the xprt status to connected
2836 */
2837 xprt_set_connected(xprt);
2838
2839
2840 if (try_module_get(THIS_MODULE))
2841 return xprt;
2842 xprt_put(xprt);
2843 ret = ERR_PTR(-EINVAL);
2844out_err:
2845 xprt_free(xprt);
2846 return ret;
2847}
2848
2849static struct xprt_class xs_local_transport = {
2850 .list = LIST_HEAD_INIT(xs_local_transport.list),
2851 .name = "named UNIX socket",
2852 .owner = THIS_MODULE,
2853 .ident = XPRT_TRANSPORT_LOCAL,
2854 .setup = xs_setup_local,
2855};
2856
2857static struct xprt_class xs_udp_transport = {
2858 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2859 .name = "udp",
2860 .owner = THIS_MODULE,
2861 .ident = XPRT_TRANSPORT_UDP,
2862 .setup = xs_setup_udp,
2863};
2864
2865static struct xprt_class xs_tcp_transport = {
2866 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2867 .name = "tcp",
2868 .owner = THIS_MODULE,
2869 .ident = XPRT_TRANSPORT_TCP,
2870 .setup = xs_setup_tcp,
2871};
2872
2873static struct xprt_class xs_bc_tcp_transport = {
2874 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2875 .name = "tcp NFSv4.1 backchannel",
2876 .owner = THIS_MODULE,
2877 .ident = XPRT_TRANSPORT_BC_TCP,
2878 .setup = xs_setup_bc_tcp,
2879};
2880
2881/**
2882 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2883 *
2884 */
2885int init_socket_xprt(void)
2886{
2887#ifdef RPC_DEBUG
2888 if (!sunrpc_table_header)
2889 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2890#endif
2891
2892 xprt_register_transport(&xs_local_transport);
2893 xprt_register_transport(&xs_udp_transport);
2894 xprt_register_transport(&xs_tcp_transport);
2895 xprt_register_transport(&xs_bc_tcp_transport);
2896
2897 return 0;
2898}
2899
2900/**
2901 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2902 *
2903 */
2904void cleanup_socket_xprt(void)
2905{
2906#ifdef RPC_DEBUG
2907 if (sunrpc_table_header) {
2908 unregister_sysctl_table(sunrpc_table_header);
2909 sunrpc_table_header = NULL;
2910 }
2911#endif
2912
2913 xprt_unregister_transport(&xs_local_transport);
2914 xprt_unregister_transport(&xs_udp_transport);
2915 xprt_unregister_transport(&xs_tcp_transport);
2916 xprt_unregister_transport(&xs_bc_tcp_transport);
2917}
2918
2919static int param_set_uint_minmax(const char *val,
2920 const struct kernel_param *kp,
2921 unsigned int min, unsigned int max)
2922{
2923 unsigned long num;
2924 int ret;
2925
2926 if (!val)
2927 return -EINVAL;
2928 ret = strict_strtoul(val, 0, &num);
2929 if (ret == -EINVAL || num < min || num > max)
2930 return -EINVAL;
2931 *((unsigned int *)kp->arg) = num;
2932 return 0;
2933}
2934
2935static int param_set_portnr(const char *val, const struct kernel_param *kp)
2936{
2937 return param_set_uint_minmax(val, kp,
2938 RPC_MIN_RESVPORT,
2939 RPC_MAX_RESVPORT);
2940}
2941
2942static struct kernel_param_ops param_ops_portnr = {
2943 .set = param_set_portnr,
2944 .get = param_get_uint,
2945};
2946
2947#define param_check_portnr(name, p) \
2948 __param_check(name, p, unsigned int);
2949
2950module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2951module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2952
2953static int param_set_slot_table_size(const char *val,
2954 const struct kernel_param *kp)
2955{
2956 return param_set_uint_minmax(val, kp,
2957 RPC_MIN_SLOT_TABLE,
2958 RPC_MAX_SLOT_TABLE);
2959}
2960
2961static struct kernel_param_ops param_ops_slot_table_size = {
2962 .set = param_set_slot_table_size,
2963 .get = param_get_uint,
2964};
2965
2966#define param_check_slot_table_size(name, p) \
2967 __param_check(name, p, unsigned int);
2968
2969static int param_set_max_slot_table_size(const char *val,
2970 const struct kernel_param *kp)
2971{
2972 return param_set_uint_minmax(val, kp,
2973 RPC_MIN_SLOT_TABLE,
2974 RPC_MAX_SLOT_TABLE_LIMIT);
2975}
2976
2977static struct kernel_param_ops param_ops_max_slot_table_size = {
2978 .set = param_set_max_slot_table_size,
2979 .get = param_get_uint,
2980};
2981
2982#define param_check_max_slot_table_size(name, p) \
2983 __param_check(name, p, unsigned int);
2984
2985module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2986 slot_table_size, 0644);
2987module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
2988 max_slot_table_size, 0644);
2989module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2990 slot_table_size, 0644);
2991