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gfs2: new export ops
[wrt350n-kernel.git] / net / sunrpc / xprtsock.c
blob02298f529dad3f4a068ed86d4cf00cbe8e352eaf
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 Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * How many times to try sending a request on a socket before waiting
140 * for the socket buffer to clear.
141 */
142 #define XS_SENDMSG_RETRY (10U)
143
144 /*
145 * Time out for an RPC UDP socket connect. UDP socket connects are
146 * synchronous, but we set a timeout anyway in case of resource
147 * exhaustion on the local host.
148 */
149 #define XS_UDP_CONN_TO (5U * HZ)
150
151 /*
152 * Wait duration for an RPC TCP connection to be established. Solaris
153 * NFS over TCP uses 60 seconds, for example, which is in line with how
154 * long a server takes to reboot.
155 */
156 #define XS_TCP_CONN_TO (60U * HZ)
157
158 /*
159 * Wait duration for a reply from the RPC portmapper.
160 */
161 #define XS_BIND_TO (60U * HZ)
162
163 /*
164 * Delay if a UDP socket connect error occurs. This is most likely some
165 * kind of resource problem on the local host.
166 */
167 #define XS_UDP_REEST_TO (2U * HZ)
168
169 /*
170 * The reestablish timeout allows clients to delay for a bit before attempting
171 * to reconnect to a server that just dropped our connection.
172 *
173 * We implement an exponential backoff when trying to reestablish a TCP
174 * transport connection with the server. Some servers like to drop a TCP
175 * connection when they are overworked, so we start with a short timeout and
176 * increase over time if the server is down or not responding.
177 */
178 #define XS_TCP_INIT_REEST_TO (3U * HZ)
179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
180
181 /*
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
185 */
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
187
188 #ifdef RPC_DEBUG
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
191 #endif
192
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
195 {
196 u8 *buf = (u8 *) packet;
197 int j;
198
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
201 if (!(j & 31)) {
202 if (j)
203 dprintk("\n");
204 dprintk("0x%04x ", j);
205 }
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 }
209 dprintk("\n");
210 }
211 #else
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
213 {
214 /* NOP */
215 }
216 #endif
217
218 struct sock_xprt {
219 struct rpc_xprt xprt;
220
221 /*
222 * Network layer
223 */
224 struct socket * sock;
225 struct sock * inet;
226
227 /*
228 * State of TCP reply receive
229 */
230 __be32 tcp_fraghdr,
231 tcp_xid;
232
233 u32 tcp_offset,
234 tcp_reclen;
235
236 unsigned long tcp_copied,
237 tcp_flags;
238
239 /*
240 * Connection of transports
241 */
242 struct delayed_work connect_worker;
243 struct sockaddr_storage addr;
244 unsigned short port;
245
246 /*
247 * UDP socket buffer size parameters
248 */
249 size_t rcvsize,
250 sndsize;
251
252 /*
253 * Saved socket callback addresses
254 */
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(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
268 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in *) &xprt->addr;
276 }
277
278 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
279 {
280 return (struct sockaddr_in6 *) &xprt->addr;
281 }
282
283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
284 {
285 struct sockaddr_in *addr = xs_addr_in(xprt);
286 char *buf;
287
288 buf = kzalloc(20, GFP_KERNEL);
289 if (buf) {
290 snprintf(buf, 20, NIPQUAD_FMT,
291 NIPQUAD(addr->sin_addr.s_addr));
292 }
293 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
294
295 buf = kzalloc(8, GFP_KERNEL);
296 if (buf) {
297 snprintf(buf, 8, "%u",
298 ntohs(addr->sin_port));
299 }
300 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
301
302 buf = kzalloc(8, GFP_KERNEL);
303 if (buf) {
304 if (xprt->prot == IPPROTO_UDP)
305 snprintf(buf, 8, "udp");
306 else
307 snprintf(buf, 8, "tcp");
308 }
309 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
310
311 buf = kzalloc(48, GFP_KERNEL);
312 if (buf) {
313 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
314 NIPQUAD(addr->sin_addr.s_addr),
315 ntohs(addr->sin_port),
316 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
317 }
318 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
319
320 buf = kzalloc(10, GFP_KERNEL);
321 if (buf) {
322 snprintf(buf, 10, "%02x%02x%02x%02x",
323 NIPQUAD(addr->sin_addr.s_addr));
324 }
325 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
326
327 buf = kzalloc(8, GFP_KERNEL);
328 if (buf) {
329 snprintf(buf, 8, "%4hx",
330 ntohs(addr->sin_port));
331 }
332 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
333
334 buf = kzalloc(30, GFP_KERNEL);
335 if (buf) {
336 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
337 NIPQUAD(addr->sin_addr.s_addr),
338 ntohs(addr->sin_port) >> 8,
339 ntohs(addr->sin_port) & 0xff);
340 }
341 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
342
343 xprt->address_strings[RPC_DISPLAY_NETID] =
344 kstrdup(xprt->prot == IPPROTO_UDP ?
345 RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL);
346 }
347
348 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
349 {
350 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
351 char *buf;
352
353 buf = kzalloc(40, GFP_KERNEL);
354 if (buf) {
355 snprintf(buf, 40, NIP6_FMT,
356 NIP6(addr->sin6_addr));
357 }
358 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
359
360 buf = kzalloc(8, GFP_KERNEL);
361 if (buf) {
362 snprintf(buf, 8, "%u",
363 ntohs(addr->sin6_port));
364 }
365 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
366
367 buf = kzalloc(8, GFP_KERNEL);
368 if (buf) {
369 if (xprt->prot == IPPROTO_UDP)
370 snprintf(buf, 8, "udp");
371 else
372 snprintf(buf, 8, "tcp");
373 }
374 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
375
376 buf = kzalloc(64, GFP_KERNEL);
377 if (buf) {
378 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
379 NIP6(addr->sin6_addr),
380 ntohs(addr->sin6_port),
381 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
382 }
383 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
384
385 buf = kzalloc(36, GFP_KERNEL);
386 if (buf) {
387 snprintf(buf, 36, NIP6_SEQFMT,
388 NIP6(addr->sin6_addr));
389 }
390 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
391
392 buf = kzalloc(8, GFP_KERNEL);
393 if (buf) {
394 snprintf(buf, 8, "%4hx",
395 ntohs(addr->sin6_port));
396 }
397 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
398
399 buf = kzalloc(50, GFP_KERNEL);
400 if (buf) {
401 snprintf(buf, 50, NIP6_FMT".%u.%u",
402 NIP6(addr->sin6_addr),
403 ntohs(addr->sin6_port) >> 8,
404 ntohs(addr->sin6_port) & 0xff);
405 }
406 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
407
408 xprt->address_strings[RPC_DISPLAY_NETID] =
409 kstrdup(xprt->prot == IPPROTO_UDP ?
410 RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL);
411 }
412
413 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
414 {
415 int i;
416
417 for (i = 0; i < RPC_DISPLAY_MAX; i++)
418 kfree(xprt->address_strings[i]);
419 }
420
421 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
422
423 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
424 {
425 struct msghdr msg = {
426 .msg_name = addr,
427 .msg_namelen = addrlen,
428 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
429 };
430 struct kvec iov = {
431 .iov_base = vec->iov_base + base,
432 .iov_len = vec->iov_len - base,
433 };
434
435 if (iov.iov_len != 0)
436 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
437 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
438 }
439
440 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
441 {
442 struct page **ppage;
443 unsigned int remainder;
444 int err, sent = 0;
445
446 remainder = xdr->page_len - base;
447 base += xdr->page_base;
448 ppage = xdr->pages + (base >> PAGE_SHIFT);
449 base &= ~PAGE_MASK;
450 for(;;) {
451 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
452 int flags = XS_SENDMSG_FLAGS;
453
454 remainder -= len;
455 if (remainder != 0 || more)
456 flags |= MSG_MORE;
457 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
458 if (remainder == 0 || err != len)
459 break;
460 sent += err;
461 ppage++;
462 base = 0;
463 }
464 if (sent == 0)
465 return err;
466 if (err > 0)
467 sent += err;
468 return sent;
469 }
470
471 /**
472 * xs_sendpages - write pages directly to a socket
473 * @sock: socket to send on
474 * @addr: UDP only -- address of destination
475 * @addrlen: UDP only -- length of destination address
476 * @xdr: buffer containing this request
477 * @base: starting position in the buffer
478 *
479 */
480 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
481 {
482 unsigned int remainder = xdr->len - base;
483 int err, sent = 0;
484
485 if (unlikely(!sock))
486 return -ENOTCONN;
487
488 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
489 if (base != 0) {
490 addr = NULL;
491 addrlen = 0;
492 }
493
494 if (base < xdr->head[0].iov_len || addr != NULL) {
495 unsigned int len = xdr->head[0].iov_len - base;
496 remainder -= len;
497 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
498 if (remainder == 0 || err != len)
499 goto out;
500 sent += err;
501 base = 0;
502 } else
503 base -= xdr->head[0].iov_len;
504
505 if (base < xdr->page_len) {
506 unsigned int len = xdr->page_len - base;
507 remainder -= len;
508 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
509 if (remainder == 0 || err != len)
510 goto out;
511 sent += err;
512 base = 0;
513 } else
514 base -= xdr->page_len;
515
516 if (base >= xdr->tail[0].iov_len)
517 return sent;
518 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
519 out:
520 if (sent == 0)
521 return err;
522 if (err > 0)
523 sent += err;
524 return sent;
525 }
526
527 /**
528 * xs_nospace - place task on wait queue if transmit was incomplete
529 * @task: task to put to sleep
530 *
531 */
532 static void xs_nospace(struct rpc_task *task)
533 {
534 struct rpc_rqst *req = task->tk_rqstp;
535 struct rpc_xprt *xprt = req->rq_xprt;
536 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
537
538 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
539 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
540 req->rq_slen);
541
542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
543 /* Protect against races with write_space */
544 spin_lock_bh(&xprt->transport_lock);
545
546 /* Don't race with disconnect */
547 if (!xprt_connected(xprt))
548 task->tk_status = -ENOTCONN;
549 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
550 xprt_wait_for_buffer_space(task);
551
552 spin_unlock_bh(&xprt->transport_lock);
553 } else
554 /* Keep holding the socket if it is blocked */
555 rpc_delay(task, HZ>>4);
556 }
557
558 /**
559 * xs_udp_send_request - write an RPC request to a UDP socket
560 * @task: address of RPC task that manages the state of an RPC request
561 *
562 * Return values:
563 * 0: The request has been sent
564 * EAGAIN: The socket was blocked, please call again later to
565 * complete the request
566 * ENOTCONN: Caller needs to invoke connect logic then call again
567 * other: Some other error occured, the request was not sent
568 */
569 static int xs_udp_send_request(struct rpc_task *task)
570 {
571 struct rpc_rqst *req = task->tk_rqstp;
572 struct rpc_xprt *xprt = req->rq_xprt;
573 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_pktdump("packet data:",
578 req->rq_svec->iov_base,
579 req->rq_svec->iov_len);
580
581 req->rq_xtime = jiffies;
582 status = xs_sendpages(transport->sock,
583 xs_addr(xprt),
584 xprt->addrlen, xdr,
585 req->rq_bytes_sent);
586
587 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
588 xdr->len - req->rq_bytes_sent, status);
589
590 if (status >= 0) {
591 task->tk_bytes_sent += status;
592 if (status >= req->rq_slen)
593 return 0;
594 /* Still some bytes left; set up for a retry later. */
595 status = -EAGAIN;
596 }
597
598 switch (status) {
599 case -ENETUNREACH:
600 case -EPIPE:
601 case -ECONNREFUSED:
602 /* When the server has died, an ICMP port unreachable message
603 * prompts ECONNREFUSED. */
604 break;
605 case -EAGAIN:
606 xs_nospace(task);
607 break;
608 default:
609 dprintk("RPC: sendmsg returned unrecognized error %d\n",
610 -status);
611 break;
612 }
613
614 return status;
615 }
616
617 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
618 {
619 u32 reclen = buf->len - sizeof(rpc_fraghdr);
620 rpc_fraghdr *base = buf->head[0].iov_base;
621 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
622 }
623
624 /**
625 * xs_tcp_send_request - write an RPC request to a TCP socket
626 * @task: address of RPC task that manages the state of an RPC request
627 *
628 * Return values:
629 * 0: The request has been sent
630 * EAGAIN: The socket was blocked, please call again later to
631 * complete the request
632 * ENOTCONN: Caller needs to invoke connect logic then call again
633 * other: Some other error occured, the request was not sent
634 *
635 * XXX: In the case of soft timeouts, should we eventually give up
636 * if sendmsg is not able to make progress?
637 */
638 static int xs_tcp_send_request(struct rpc_task *task)
639 {
640 struct rpc_rqst *req = task->tk_rqstp;
641 struct rpc_xprt *xprt = req->rq_xprt;
642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
643 struct xdr_buf *xdr = &req->rq_snd_buf;
644 int status;
645 unsigned int retry = 0;
646
647 xs_encode_tcp_record_marker(&req->rq_snd_buf);
648
649 xs_pktdump("packet data:",
650 req->rq_svec->iov_base,
651 req->rq_svec->iov_len);
652
653 /* Continue transmitting the packet/record. We must be careful
654 * to cope with writespace callbacks arriving _after_ we have
655 * called sendmsg(). */
656 while (1) {
657 req->rq_xtime = jiffies;
658 status = xs_sendpages(transport->sock,
659 NULL, 0, xdr, req->rq_bytes_sent);
660
661 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
662 xdr->len - req->rq_bytes_sent, status);
663
664 if (unlikely(status < 0))
665 break;
666
667 /* If we've sent the entire packet, immediately
668 * reset the count of bytes sent. */
669 req->rq_bytes_sent += status;
670 task->tk_bytes_sent += status;
671 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
672 req->rq_bytes_sent = 0;
673 return 0;
674 }
675
676 status = -EAGAIN;
677 if (retry++ > XS_SENDMSG_RETRY)
678 break;
679 }
680
681 switch (status) {
682 case -EAGAIN:
683 xs_nospace(task);
684 break;
685 case -ECONNREFUSED:
686 case -ECONNRESET:
687 case -ENOTCONN:
688 case -EPIPE:
689 status = -ENOTCONN;
690 break;
691 default:
692 dprintk("RPC: sendmsg returned unrecognized error %d\n",
693 -status);
694 xprt_disconnect(xprt);
695 break;
696 }
697
698 return status;
699 }
700
701 /**
702 * xs_tcp_release_xprt - clean up after a tcp transmission
703 * @xprt: transport
704 * @task: rpc task
705 *
706 * This cleans up if an error causes us to abort the transmission of a request.
707 * In this case, the socket may need to be reset in order to avoid confusing
708 * the server.
709 */
710 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
711 {
712 struct rpc_rqst *req;
713
714 if (task != xprt->snd_task)
715 return;
716 if (task == NULL)
717 goto out_release;
718 req = task->tk_rqstp;
719 if (req->rq_bytes_sent == 0)
720 goto out_release;
721 if (req->rq_bytes_sent == req->rq_snd_buf.len)
722 goto out_release;
723 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
724 out_release:
725 xprt_release_xprt(xprt, task);
726 }
727
728 /**
729 * xs_close - close a socket
730 * @xprt: transport
731 *
732 * This is used when all requests are complete; ie, no DRC state remains
733 * on the server we want to save.
734 */
735 static void xs_close(struct rpc_xprt *xprt)
736 {
737 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
738 struct socket *sock = transport->sock;
739 struct sock *sk = transport->inet;
740
741 if (!sk)
742 goto clear_close_wait;
743
744 dprintk("RPC: xs_close xprt %p\n", xprt);
745
746 write_lock_bh(&sk->sk_callback_lock);
747 transport->inet = NULL;
748 transport->sock = NULL;
749
750 sk->sk_user_data = NULL;
751 sk->sk_data_ready = transport->old_data_ready;
752 sk->sk_state_change = transport->old_state_change;
753 sk->sk_write_space = transport->old_write_space;
754 write_unlock_bh(&sk->sk_callback_lock);
755
756 sk->sk_no_check = 0;
757
758 sock_release(sock);
759 clear_close_wait:
760 smp_mb__before_clear_bit();
761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
762 smp_mb__after_clear_bit();
763 }
764
765 /**
766 * xs_destroy - prepare to shutdown a transport
767 * @xprt: doomed transport
768 *
769 */
770 static void xs_destroy(struct rpc_xprt *xprt)
771 {
772 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
773
774 dprintk("RPC: xs_destroy xprt %p\n", xprt);
775
776 cancel_rearming_delayed_work(&transport->connect_worker);
777
778 xprt_disconnect(xprt);
779 xs_close(xprt);
780 xs_free_peer_addresses(xprt);
781 kfree(xprt->slot);
782 kfree(xprt);
783 module_put(THIS_MODULE);
784 }
785
786 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
787 {
788 return (struct rpc_xprt *) sk->sk_user_data;
789 }
790
791 /**
792 * xs_udp_data_ready - "data ready" callback for UDP sockets
793 * @sk: socket with data to read
794 * @len: how much data to read
795 *
796 */
797 static void xs_udp_data_ready(struct sock *sk, int len)
798 {
799 struct rpc_task *task;
800 struct rpc_xprt *xprt;
801 struct rpc_rqst *rovr;
802 struct sk_buff *skb;
803 int err, repsize, copied;
804 u32 _xid;
805 __be32 *xp;
806
807 read_lock(&sk->sk_callback_lock);
808 dprintk("RPC: xs_udp_data_ready...\n");
809 if (!(xprt = xprt_from_sock(sk)))
810 goto out;
811
812 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
813 goto out;
814
815 if (xprt->shutdown)
816 goto dropit;
817
818 repsize = skb->len - sizeof(struct udphdr);
819 if (repsize < 4) {
820 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
821 goto dropit;
822 }
823
824 /* Copy the XID from the skb... */
825 xp = skb_header_pointer(skb, sizeof(struct udphdr),
826 sizeof(_xid), &_xid);
827 if (xp == NULL)
828 goto dropit;
829
830 /* Look up and lock the request corresponding to the given XID */
831 spin_lock(&xprt->transport_lock);
832 rovr = xprt_lookup_rqst(xprt, *xp);
833 if (!rovr)
834 goto out_unlock;
835 task = rovr->rq_task;
836
837 if ((copied = rovr->rq_private_buf.buflen) > repsize)
838 copied = repsize;
839
840 /* Suck it into the iovec, verify checksum if not done by hw. */
841 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
842 goto out_unlock;
843
844 /* Something worked... */
845 dst_confirm(skb->dst);
846
847 xprt_adjust_cwnd(task, copied);
848 xprt_update_rtt(task);
849 xprt_complete_rqst(task, copied);
850
851 out_unlock:
852 spin_unlock(&xprt->transport_lock);
853 dropit:
854 skb_free_datagram(sk, skb);
855 out:
856 read_unlock(&sk->sk_callback_lock);
857 }
858
859 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
860 {
861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
862 size_t len, used;
863 char *p;
864
865 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
866 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
867 used = xdr_skb_read_bits(desc, p, len);
868 transport->tcp_offset += used;
869 if (used != len)
870 return;
871
872 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
873 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
874 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
875 else
876 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
877 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
878
879 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
880 transport->tcp_offset = 0;
881
882 /* Sanity check of the record length */
883 if (unlikely(transport->tcp_reclen < 4)) {
884 dprintk("RPC: invalid TCP record fragment length\n");
885 xprt_disconnect(xprt);
886 return;
887 }
888 dprintk("RPC: reading TCP record fragment of length %d\n",
889 transport->tcp_reclen);
890 }
891
892 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
893 {
894 if (transport->tcp_offset == transport->tcp_reclen) {
895 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
896 transport->tcp_offset = 0;
897 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
898 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
899 transport->tcp_flags |= TCP_RCV_COPY_XID;
900 transport->tcp_copied = 0;
901 }
902 }
903 }
904
905 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
906 {
907 size_t len, used;
908 char *p;
909
910 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
911 dprintk("RPC: reading XID (%Zu bytes)\n", len);
912 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
913 used = xdr_skb_read_bits(desc, p, len);
914 transport->tcp_offset += used;
915 if (used != len)
916 return;
917 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
918 transport->tcp_flags |= TCP_RCV_COPY_DATA;
919 transport->tcp_copied = 4;
920 dprintk("RPC: reading reply for XID %08x\n",
921 ntohl(transport->tcp_xid));
922 xs_tcp_check_fraghdr(transport);
923 }
924
925 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
926 {
927 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
928 struct rpc_rqst *req;
929 struct xdr_buf *rcvbuf;
930 size_t len;
931 ssize_t r;
932
933 /* Find and lock the request corresponding to this xid */
934 spin_lock(&xprt->transport_lock);
935 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
936 if (!req) {
937 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
938 dprintk("RPC: XID %08x request not found!\n",
939 ntohl(transport->tcp_xid));
940 spin_unlock(&xprt->transport_lock);
941 return;
942 }
943
944 rcvbuf = &req->rq_private_buf;
945 len = desc->count;
946 if (len > transport->tcp_reclen - transport->tcp_offset) {
947 struct xdr_skb_reader my_desc;
948
949 len = transport->tcp_reclen - transport->tcp_offset;
950 memcpy(&my_desc, desc, sizeof(my_desc));
951 my_desc.count = len;
952 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
953 &my_desc, xdr_skb_read_bits);
954 desc->count -= r;
955 desc->offset += r;
956 } else
957 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
958 desc, xdr_skb_read_bits);
959
960 if (r > 0) {
961 transport->tcp_copied += r;
962 transport->tcp_offset += r;
963 }
964 if (r != len) {
965 /* Error when copying to the receive buffer,
966 * usually because we weren't able to allocate
967 * additional buffer pages. All we can do now
968 * is turn off TCP_RCV_COPY_DATA, so the request
969 * will not receive any additional updates,
970 * and time out.
971 * Any remaining data from this record will
972 * be discarded.
973 */
974 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
975 dprintk("RPC: XID %08x truncated request\n",
976 ntohl(transport->tcp_xid));
977 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
978 "tcp_offset = %u, tcp_reclen = %u\n",
979 xprt, transport->tcp_copied,
980 transport->tcp_offset, transport->tcp_reclen);
981 goto out;
982 }
983
984 dprintk("RPC: XID %08x read %Zd bytes\n",
985 ntohl(transport->tcp_xid), r);
986 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
987 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
988 transport->tcp_offset, transport->tcp_reclen);
989
990 if (transport->tcp_copied == req->rq_private_buf.buflen)
991 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
992 else if (transport->tcp_offset == transport->tcp_reclen) {
993 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
994 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
995 }
996
997 out:
998 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
999 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1000 spin_unlock(&xprt->transport_lock);
1001 xs_tcp_check_fraghdr(transport);
1002 }
1003
1004 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1005 {
1006 size_t len;
1007
1008 len = transport->tcp_reclen - transport->tcp_offset;
1009 if (len > desc->count)
1010 len = desc->count;
1011 desc->count -= len;
1012 desc->offset += len;
1013 transport->tcp_offset += len;
1014 dprintk("RPC: discarded %Zu bytes\n", len);
1015 xs_tcp_check_fraghdr(transport);
1016 }
1017
1018 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1019 {
1020 struct rpc_xprt *xprt = rd_desc->arg.data;
1021 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1022 struct xdr_skb_reader desc = {
1023 .skb = skb,
1024 .offset = offset,
1025 .count = len,
1026 };
1027
1028 dprintk("RPC: xs_tcp_data_recv started\n");
1029 do {
1030 /* Read in a new fragment marker if necessary */
1031 /* Can we ever really expect to get completely empty fragments? */
1032 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1033 xs_tcp_read_fraghdr(xprt, &desc);
1034 continue;
1035 }
1036 /* Read in the xid if necessary */
1037 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1038 xs_tcp_read_xid(transport, &desc);
1039 continue;
1040 }
1041 /* Read in the request data */
1042 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1043 xs_tcp_read_request(xprt, &desc);
1044 continue;
1045 }
1046 /* Skip over any trailing bytes on short reads */
1047 xs_tcp_read_discard(transport, &desc);
1048 } while (desc.count);
1049 dprintk("RPC: xs_tcp_data_recv done\n");
1050 return len - desc.count;
1051 }
1052
1053 /**
1054 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1055 * @sk: socket with data to read
1056 * @bytes: how much data to read
1057 *
1058 */
1059 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1060 {
1061 struct rpc_xprt *xprt;
1062 read_descriptor_t rd_desc;
1063
1064 dprintk("RPC: xs_tcp_data_ready...\n");
1065
1066 read_lock(&sk->sk_callback_lock);
1067 if (!(xprt = xprt_from_sock(sk)))
1068 goto out;
1069 if (xprt->shutdown)
1070 goto out;
1071
1072 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1073 rd_desc.arg.data = xprt;
1074 rd_desc.count = 65536;
1075 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1076 out:
1077 read_unlock(&sk->sk_callback_lock);
1078 }
1079
1080 /**
1081 * xs_tcp_state_change - callback to handle TCP socket state changes
1082 * @sk: socket whose state has changed
1083 *
1084 */
1085 static void xs_tcp_state_change(struct sock *sk)
1086 {
1087 struct rpc_xprt *xprt;
1088
1089 read_lock(&sk->sk_callback_lock);
1090 if (!(xprt = xprt_from_sock(sk)))
1091 goto out;
1092 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1093 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1094 sk->sk_state, xprt_connected(xprt),
1095 sock_flag(sk, SOCK_DEAD),
1096 sock_flag(sk, SOCK_ZAPPED));
1097
1098 switch (sk->sk_state) {
1099 case TCP_ESTABLISHED:
1100 spin_lock_bh(&xprt->transport_lock);
1101 if (!xprt_test_and_set_connected(xprt)) {
1102 struct sock_xprt *transport = container_of(xprt,
1103 struct sock_xprt, xprt);
1104
1105 /* Reset TCP record info */
1106 transport->tcp_offset = 0;
1107 transport->tcp_reclen = 0;
1108 transport->tcp_copied = 0;
1109 transport->tcp_flags =
1110 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1111
1112 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1113 xprt_wake_pending_tasks(xprt, 0);
1114 }
1115 spin_unlock_bh(&xprt->transport_lock);
1116 break;
1117 case TCP_SYN_SENT:
1118 case TCP_SYN_RECV:
1119 break;
1120 case TCP_CLOSE_WAIT:
1121 /* Try to schedule an autoclose RPC calls */
1122 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1123 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1124 queue_work(rpciod_workqueue, &xprt->task_cleanup);
1125 default:
1126 xprt_disconnect(xprt);
1127 }
1128 out:
1129 read_unlock(&sk->sk_callback_lock);
1130 }
1131
1132 /**
1133 * xs_udp_write_space - callback invoked when socket buffer space
1134 * becomes available
1135 * @sk: socket whose state has changed
1136 *
1137 * Called when more output buffer space is available for this socket.
1138 * We try not to wake our writers until they can make "significant"
1139 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1140 * with a bunch of small requests.
1141 */
1142 static void xs_udp_write_space(struct sock *sk)
1143 {
1144 read_lock(&sk->sk_callback_lock);
1145
1146 /* from net/core/sock.c:sock_def_write_space */
1147 if (sock_writeable(sk)) {
1148 struct socket *sock;
1149 struct rpc_xprt *xprt;
1150
1151 if (unlikely(!(sock = sk->sk_socket)))
1152 goto out;
1153 if (unlikely(!(xprt = xprt_from_sock(sk))))
1154 goto out;
1155 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1156 goto out;
1157
1158 xprt_write_space(xprt);
1159 }
1160
1161 out:
1162 read_unlock(&sk->sk_callback_lock);
1163 }
1164
1165 /**
1166 * xs_tcp_write_space - callback invoked when socket buffer space
1167 * becomes available
1168 * @sk: socket whose state has changed
1169 *
1170 * Called when more output buffer space is available for this socket.
1171 * We try not to wake our writers until they can make "significant"
1172 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1173 * with a bunch of small requests.
1174 */
1175 static void xs_tcp_write_space(struct sock *sk)
1176 {
1177 read_lock(&sk->sk_callback_lock);
1178
1179 /* from net/core/stream.c:sk_stream_write_space */
1180 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1181 struct socket *sock;
1182 struct rpc_xprt *xprt;
1183
1184 if (unlikely(!(sock = sk->sk_socket)))
1185 goto out;
1186 if (unlikely(!(xprt = xprt_from_sock(sk))))
1187 goto out;
1188 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1189 goto out;
1190
1191 xprt_write_space(xprt);
1192 }
1193
1194 out:
1195 read_unlock(&sk->sk_callback_lock);
1196 }
1197
1198 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1199 {
1200 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1201 struct sock *sk = transport->inet;
1202
1203 if (transport->rcvsize) {
1204 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1205 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1206 }
1207 if (transport->sndsize) {
1208 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1209 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1210 sk->sk_write_space(sk);
1211 }
1212 }
1213
1214 /**
1215 * xs_udp_set_buffer_size - set send and receive limits
1216 * @xprt: generic transport
1217 * @sndsize: requested size of send buffer, in bytes
1218 * @rcvsize: requested size of receive buffer, in bytes
1219 *
1220 * Set socket send and receive buffer size limits.
1221 */
1222 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1223 {
1224 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1225
1226 transport->sndsize = 0;
1227 if (sndsize)
1228 transport->sndsize = sndsize + 1024;
1229 transport->rcvsize = 0;
1230 if (rcvsize)
1231 transport->rcvsize = rcvsize + 1024;
1232
1233 xs_udp_do_set_buffer_size(xprt);
1234 }
1235
1236 /**
1237 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1238 * @task: task that timed out
1239 *
1240 * Adjust the congestion window after a retransmit timeout has occurred.
1241 */
1242 static void xs_udp_timer(struct rpc_task *task)
1243 {
1244 xprt_adjust_cwnd(task, -ETIMEDOUT);
1245 }
1246
1247 static unsigned short xs_get_random_port(void)
1248 {
1249 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1250 unsigned short rand = (unsigned short) net_random() % range;
1251 return rand + xprt_min_resvport;
1252 }
1253
1254 /**
1255 * xs_set_port - reset the port number in the remote endpoint address
1256 * @xprt: generic transport
1257 * @port: new port number
1258 *
1259 */
1260 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1261 {
1262 struct sockaddr *addr = xs_addr(xprt);
1263
1264 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1265
1266 switch (addr->sa_family) {
1267 case AF_INET:
1268 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1269 break;
1270 case AF_INET6:
1271 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1272 break;
1273 default:
1274 BUG();
1275 }
1276 }
1277
1278 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1279 {
1280 struct sockaddr_in myaddr = {
1281 .sin_family = AF_INET,
1282 };
1283 struct sockaddr_in *sa;
1284 int err;
1285 unsigned short port = transport->port;
1286
1287 if (!transport->xprt.resvport)
1288 port = 0;
1289 sa = (struct sockaddr_in *)&transport->addr;
1290 myaddr.sin_addr = sa->sin_addr;
1291 do {
1292 myaddr.sin_port = htons(port);
1293 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1294 sizeof(myaddr));
1295 if (!transport->xprt.resvport)
1296 break;
1297 if (err == 0) {
1298 transport->port = port;
1299 break;
1300 }
1301 if (port <= xprt_min_resvport)
1302 port = xprt_max_resvport;
1303 else
1304 port--;
1305 } while (err == -EADDRINUSE && port != transport->port);
1306 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1307 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1308 port, err ? "failed" : "ok", err);
1309 return err;
1310 }
1311
1312 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1313 {
1314 struct sockaddr_in6 myaddr = {
1315 .sin6_family = AF_INET6,
1316 };
1317 struct sockaddr_in6 *sa;
1318 int err;
1319 unsigned short port = transport->port;
1320
1321 if (!transport->xprt.resvport)
1322 port = 0;
1323 sa = (struct sockaddr_in6 *)&transport->addr;
1324 myaddr.sin6_addr = sa->sin6_addr;
1325 do {
1326 myaddr.sin6_port = htons(port);
1327 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1328 sizeof(myaddr));
1329 if (!transport->xprt.resvport)
1330 break;
1331 if (err == 0) {
1332 transport->port = port;
1333 break;
1334 }
1335 if (port <= xprt_min_resvport)
1336 port = xprt_max_resvport;
1337 else
1338 port--;
1339 } while (err == -EADDRINUSE && port != transport->port);
1340 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1341 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1342 return err;
1343 }
1344
1345 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1346 static struct lock_class_key xs_key[2];
1347 static struct lock_class_key xs_slock_key[2];
1348
1349 static inline void xs_reclassify_socket4(struct socket *sock)
1350 {
1351 struct sock *sk = sock->sk;
1352
1353 BUG_ON(sock_owned_by_user(sk));
1354 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1355 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1356 }
1357
1358 static inline void xs_reclassify_socket6(struct socket *sock)
1359 {
1360 struct sock *sk = sock->sk;
1361
1362 BUG_ON(sock_owned_by_user(sk));
1363 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1364 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1365 }
1366 #else
1367 static inline void xs_reclassify_socket4(struct socket *sock)
1368 {
1369 }
1370
1371 static inline void xs_reclassify_socket6(struct socket *sock)
1372 {
1373 }
1374 #endif
1375
1376 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1377 {
1378 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1379
1380 if (!transport->inet) {
1381 struct sock *sk = sock->sk;
1382
1383 write_lock_bh(&sk->sk_callback_lock);
1384
1385 sk->sk_user_data = xprt;
1386 transport->old_data_ready = sk->sk_data_ready;
1387 transport->old_state_change = sk->sk_state_change;
1388 transport->old_write_space = sk->sk_write_space;
1389 sk->sk_data_ready = xs_udp_data_ready;
1390 sk->sk_write_space = xs_udp_write_space;
1391 sk->sk_no_check = UDP_CSUM_NORCV;
1392 sk->sk_allocation = GFP_ATOMIC;
1393
1394 xprt_set_connected(xprt);
1395
1396 /* Reset to new socket */
1397 transport->sock = sock;
1398 transport->inet = sk;
1399
1400 write_unlock_bh(&sk->sk_callback_lock);
1401 }
1402 xs_udp_do_set_buffer_size(xprt);
1403 }
1404
1405 /**
1406 * xs_udp_connect_worker4 - set up a UDP socket
1407 * @work: RPC transport to connect
1408 *
1409 * Invoked by a work queue tasklet.
1410 */
1411 static void xs_udp_connect_worker4(struct work_struct *work)
1412 {
1413 struct sock_xprt *transport =
1414 container_of(work, struct sock_xprt, connect_worker.work);
1415 struct rpc_xprt *xprt = &transport->xprt;
1416 struct socket *sock = transport->sock;
1417 int err, status = -EIO;
1418
1419 if (xprt->shutdown || !xprt_bound(xprt))
1420 goto out;
1421
1422 /* Start by resetting any existing state */
1423 xs_close(xprt);
1424
1425 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1426 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1427 goto out;
1428 }
1429 xs_reclassify_socket4(sock);
1430
1431 if (xs_bind4(transport, sock)) {
1432 sock_release(sock);
1433 goto out;
1434 }
1435
1436 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1437 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1438
1439 xs_udp_finish_connecting(xprt, sock);
1440 status = 0;
1441 out:
1442 xprt_wake_pending_tasks(xprt, status);
1443 xprt_clear_connecting(xprt);
1444 }
1445
1446 /**
1447 * xs_udp_connect_worker6 - set up a UDP socket
1448 * @work: RPC transport to connect
1449 *
1450 * Invoked by a work queue tasklet.
1451 */
1452 static void xs_udp_connect_worker6(struct work_struct *work)
1453 {
1454 struct sock_xprt *transport =
1455 container_of(work, struct sock_xprt, connect_worker.work);
1456 struct rpc_xprt *xprt = &transport->xprt;
1457 struct socket *sock = transport->sock;
1458 int err, status = -EIO;
1459
1460 if (xprt->shutdown || !xprt_bound(xprt))
1461 goto out;
1462
1463 /* Start by resetting any existing state */
1464 xs_close(xprt);
1465
1466 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1467 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1468 goto out;
1469 }
1470 xs_reclassify_socket6(sock);
1471
1472 if (xs_bind6(transport, sock) < 0) {
1473 sock_release(sock);
1474 goto out;
1475 }
1476
1477 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1478 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1479
1480 xs_udp_finish_connecting(xprt, sock);
1481 status = 0;
1482 out:
1483 xprt_wake_pending_tasks(xprt, status);
1484 xprt_clear_connecting(xprt);
1485 }
1486
1487 /*
1488 * We need to preserve the port number so the reply cache on the server can
1489 * find our cached RPC replies when we get around to reconnecting.
1490 */
1491 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1492 {
1493 int result;
1494 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1495 struct sockaddr any;
1496
1497 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1498
1499 /*
1500 * Disconnect the transport socket by doing a connect operation
1501 * with AF_UNSPEC. This should return immediately...
1502 */
1503 memset(&any, 0, sizeof(any));
1504 any.sa_family = AF_UNSPEC;
1505 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1506 if (result)
1507 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1508 result);
1509 }
1510
1511 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1512 {
1513 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1514
1515 if (!transport->inet) {
1516 struct sock *sk = sock->sk;
1517
1518 write_lock_bh(&sk->sk_callback_lock);
1519
1520 sk->sk_user_data = xprt;
1521 transport->old_data_ready = sk->sk_data_ready;
1522 transport->old_state_change = sk->sk_state_change;
1523 transport->old_write_space = sk->sk_write_space;
1524 sk->sk_data_ready = xs_tcp_data_ready;
1525 sk->sk_state_change = xs_tcp_state_change;
1526 sk->sk_write_space = xs_tcp_write_space;
1527 sk->sk_allocation = GFP_ATOMIC;
1528
1529 /* socket options */
1530 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1531 sock_reset_flag(sk, SOCK_LINGER);
1532 tcp_sk(sk)->linger2 = 0;
1533 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1534
1535 xprt_clear_connected(xprt);
1536
1537 /* Reset to new socket */
1538 transport->sock = sock;
1539 transport->inet = sk;
1540
1541 write_unlock_bh(&sk->sk_callback_lock);
1542 }
1543
1544 /* Tell the socket layer to start connecting... */
1545 xprt->stat.connect_count++;
1546 xprt->stat.connect_start = jiffies;
1547 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1548 }
1549
1550 /**
1551 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1552 * @work: RPC transport to connect
1553 *
1554 * Invoked by a work queue tasklet.
1555 */
1556 static void xs_tcp_connect_worker4(struct work_struct *work)
1557 {
1558 struct sock_xprt *transport =
1559 container_of(work, struct sock_xprt, connect_worker.work);
1560 struct rpc_xprt *xprt = &transport->xprt;
1561 struct socket *sock = transport->sock;
1562 int err, status = -EIO;
1563
1564 if (xprt->shutdown || !xprt_bound(xprt))
1565 goto out;
1566
1567 if (!sock) {
1568 /* start from scratch */
1569 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1570 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1571 goto out;
1572 }
1573 xs_reclassify_socket4(sock);
1574
1575 if (xs_bind4(transport, sock) < 0) {
1576 sock_release(sock);
1577 goto out;
1578 }
1579 } else
1580 /* "close" the socket, preserving the local port */
1581 xs_tcp_reuse_connection(xprt);
1582
1583 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1584 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1585
1586 status = xs_tcp_finish_connecting(xprt, sock);
1587 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1588 xprt, -status, xprt_connected(xprt),
1589 sock->sk->sk_state);
1590 if (status < 0) {
1591 switch (status) {
1592 case -EINPROGRESS:
1593 case -EALREADY:
1594 goto out_clear;
1595 case -ECONNREFUSED:
1596 case -ECONNRESET:
1597 /* retry with existing socket, after a delay */
1598 break;
1599 default:
1600 /* get rid of existing socket, and retry */
1601 xs_close(xprt);
1602 break;
1603 }
1604 }
1605 out:
1606 xprt_wake_pending_tasks(xprt, status);
1607 out_clear:
1608 xprt_clear_connecting(xprt);
1609 }
1610
1611 /**
1612 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1613 * @work: RPC transport to connect
1614 *
1615 * Invoked by a work queue tasklet.
1616 */
1617 static void xs_tcp_connect_worker6(struct work_struct *work)
1618 {
1619 struct sock_xprt *transport =
1620 container_of(work, struct sock_xprt, connect_worker.work);
1621 struct rpc_xprt *xprt = &transport->xprt;
1622 struct socket *sock = transport->sock;
1623 int err, status = -EIO;
1624
1625 if (xprt->shutdown || !xprt_bound(xprt))
1626 goto out;
1627
1628 if (!sock) {
1629 /* start from scratch */
1630 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1631 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1632 goto out;
1633 }
1634 xs_reclassify_socket6(sock);
1635
1636 if (xs_bind6(transport, sock) < 0) {
1637 sock_release(sock);
1638 goto out;
1639 }
1640 } else
1641 /* "close" the socket, preserving the local port */
1642 xs_tcp_reuse_connection(xprt);
1643
1644 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1645 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1646
1647 status = xs_tcp_finish_connecting(xprt, sock);
1648 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1649 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1650 if (status < 0) {
1651 switch (status) {
1652 case -EINPROGRESS:
1653 case -EALREADY:
1654 goto out_clear;
1655 case -ECONNREFUSED:
1656 case -ECONNRESET:
1657 /* retry with existing socket, after a delay */
1658 break;
1659 default:
1660 /* get rid of existing socket, and retry */
1661 xs_close(xprt);
1662 break;
1663 }
1664 }
1665 out:
1666 xprt_wake_pending_tasks(xprt, status);
1667 out_clear:
1668 xprt_clear_connecting(xprt);
1669 }
1670
1671 /**
1672 * xs_connect - connect a socket to a remote endpoint
1673 * @task: address of RPC task that manages state of connect request
1674 *
1675 * TCP: If the remote end dropped the connection, delay reconnecting.
1676 *
1677 * UDP socket connects are synchronous, but we use a work queue anyway
1678 * to guarantee that even unprivileged user processes can set up a
1679 * socket on a privileged port.
1680 *
1681 * If a UDP socket connect fails, the delay behavior here prevents
1682 * retry floods (hard mounts).
1683 */
1684 static void xs_connect(struct rpc_task *task)
1685 {
1686 struct rpc_xprt *xprt = task->tk_xprt;
1687 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1688
1689 if (xprt_test_and_set_connecting(xprt))
1690 return;
1691
1692 if (transport->sock != NULL) {
1693 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1694 "seconds\n",
1695 xprt, xprt->reestablish_timeout / HZ);
1696 queue_delayed_work(rpciod_workqueue,
1697 &transport->connect_worker,
1698 xprt->reestablish_timeout);
1699 xprt->reestablish_timeout <<= 1;
1700 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1701 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1702 } else {
1703 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1704 queue_delayed_work(rpciod_workqueue,
1705 &transport->connect_worker, 0);
1706 }
1707 }
1708
1709 /**
1710 * xs_udp_print_stats - display UDP socket-specifc stats
1711 * @xprt: rpc_xprt struct containing statistics
1712 * @seq: output file
1713 *
1714 */
1715 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1716 {
1717 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1718
1719 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1720 transport->port,
1721 xprt->stat.bind_count,
1722 xprt->stat.sends,
1723 xprt->stat.recvs,
1724 xprt->stat.bad_xids,
1725 xprt->stat.req_u,
1726 xprt->stat.bklog_u);
1727 }
1728
1729 /**
1730 * xs_tcp_print_stats - display TCP socket-specifc stats
1731 * @xprt: rpc_xprt struct containing statistics
1732 * @seq: output file
1733 *
1734 */
1735 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1736 {
1737 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1738 long idle_time = 0;
1739
1740 if (xprt_connected(xprt))
1741 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1742
1743 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1744 transport->port,
1745 xprt->stat.bind_count,
1746 xprt->stat.connect_count,
1747 xprt->stat.connect_time,
1748 idle_time,
1749 xprt->stat.sends,
1750 xprt->stat.recvs,
1751 xprt->stat.bad_xids,
1752 xprt->stat.req_u,
1753 xprt->stat.bklog_u);
1754 }
1755
1756 static struct rpc_xprt_ops xs_udp_ops = {
1757 .set_buffer_size = xs_udp_set_buffer_size,
1758 .reserve_xprt = xprt_reserve_xprt_cong,
1759 .release_xprt = xprt_release_xprt_cong,
1760 .rpcbind = rpcb_getport_async,
1761 .set_port = xs_set_port,
1762 .connect = xs_connect,
1763 .buf_alloc = rpc_malloc,
1764 .buf_free = rpc_free,
1765 .send_request = xs_udp_send_request,
1766 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1767 .timer = xs_udp_timer,
1768 .release_request = xprt_release_rqst_cong,
1769 .close = xs_close,
1770 .destroy = xs_destroy,
1771 .print_stats = xs_udp_print_stats,
1772 };
1773
1774 static struct rpc_xprt_ops xs_tcp_ops = {
1775 .reserve_xprt = xprt_reserve_xprt,
1776 .release_xprt = xs_tcp_release_xprt,
1777 .rpcbind = rpcb_getport_async,
1778 .set_port = xs_set_port,
1779 .connect = xs_connect,
1780 .buf_alloc = rpc_malloc,
1781 .buf_free = rpc_free,
1782 .send_request = xs_tcp_send_request,
1783 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1784 .close = xs_close,
1785 .destroy = xs_destroy,
1786 .print_stats = xs_tcp_print_stats,
1787 };
1788
1789 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1790 unsigned int slot_table_size)
1791 {
1792 struct rpc_xprt *xprt;
1793 struct sock_xprt *new;
1794
1795 if (args->addrlen > sizeof(xprt->addr)) {
1796 dprintk("RPC: xs_setup_xprt: address too large\n");
1797 return ERR_PTR(-EBADF);
1798 }
1799
1800 new = kzalloc(sizeof(*new), GFP_KERNEL);
1801 if (new == NULL) {
1802 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1803 "rpc_xprt\n");
1804 return ERR_PTR(-ENOMEM);
1805 }
1806 xprt = &new->xprt;
1807
1808 xprt->max_reqs = slot_table_size;
1809 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1810 if (xprt->slot == NULL) {
1811 kfree(xprt);
1812 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1813 "table\n");
1814 return ERR_PTR(-ENOMEM);
1815 }
1816
1817 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1818 xprt->addrlen = args->addrlen;
1819 if (args->srcaddr)
1820 memcpy(&new->addr, args->srcaddr, args->addrlen);
1821 new->port = xs_get_random_port();
1822
1823 return xprt;
1824 }
1825
1826 /**
1827 * xs_setup_udp - Set up transport to use a UDP socket
1828 * @args: rpc transport creation arguments
1829 *
1830 */
1831 struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1832 {
1833 struct sockaddr *addr = args->dstaddr;
1834 struct rpc_xprt *xprt;
1835 struct sock_xprt *transport;
1836
1837 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1838 if (IS_ERR(xprt))
1839 return xprt;
1840 transport = container_of(xprt, struct sock_xprt, xprt);
1841
1842 xprt->prot = IPPROTO_UDP;
1843 xprt->tsh_size = 0;
1844 /* XXX: header size can vary due to auth type, IPv6, etc. */
1845 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1846
1847 xprt->bind_timeout = XS_BIND_TO;
1848 xprt->connect_timeout = XS_UDP_CONN_TO;
1849 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1850 xprt->idle_timeout = XS_IDLE_DISC_TO;
1851
1852 xprt->ops = &xs_udp_ops;
1853
1854 if (args->timeout)
1855 xprt->timeout = *args->timeout;
1856 else
1857 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1858
1859 switch (addr->sa_family) {
1860 case AF_INET:
1861 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1862 xprt_set_bound(xprt);
1863
1864 INIT_DELAYED_WORK(&transport->connect_worker,
1865 xs_udp_connect_worker4);
1866 xs_format_ipv4_peer_addresses(xprt);
1867 break;
1868 case AF_INET6:
1869 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1870 xprt_set_bound(xprt);
1871
1872 INIT_DELAYED_WORK(&transport->connect_worker,
1873 xs_udp_connect_worker6);
1874 xs_format_ipv6_peer_addresses(xprt);
1875 break;
1876 default:
1877 kfree(xprt);
1878 return ERR_PTR(-EAFNOSUPPORT);
1879 }
1880
1881 dprintk("RPC: set up transport to address %s\n",
1882 xprt->address_strings[RPC_DISPLAY_ALL]);
1883
1884 if (try_module_get(THIS_MODULE))
1885 return xprt;
1886
1887 kfree(xprt->slot);
1888 kfree(xprt);
1889 return ERR_PTR(-EINVAL);
1890 }
1891
1892 /**
1893 * xs_setup_tcp - Set up transport to use a TCP socket
1894 * @args: rpc transport creation arguments
1895 *
1896 */
1897 struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1898 {
1899 struct sockaddr *addr = args->dstaddr;
1900 struct rpc_xprt *xprt;
1901 struct sock_xprt *transport;
1902
1903 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1904 if (IS_ERR(xprt))
1905 return xprt;
1906 transport = container_of(xprt, struct sock_xprt, xprt);
1907
1908 xprt->prot = IPPROTO_TCP;
1909 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1910 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1911
1912 xprt->bind_timeout = XS_BIND_TO;
1913 xprt->connect_timeout = XS_TCP_CONN_TO;
1914 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1915 xprt->idle_timeout = XS_IDLE_DISC_TO;
1916
1917 xprt->ops = &xs_tcp_ops;
1918
1919 if (args->timeout)
1920 xprt->timeout = *args->timeout;
1921 else
1922 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1923
1924 switch (addr->sa_family) {
1925 case AF_INET:
1926 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1927 xprt_set_bound(xprt);
1928
1929 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1930 xs_format_ipv4_peer_addresses(xprt);
1931 break;
1932 case AF_INET6:
1933 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1934 xprt_set_bound(xprt);
1935
1936 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
1937 xs_format_ipv6_peer_addresses(xprt);
1938 break;
1939 default:
1940 kfree(xprt);
1941 return ERR_PTR(-EAFNOSUPPORT);
1942 }
1943
1944 dprintk("RPC: set up transport to address %s\n",
1945 xprt->address_strings[RPC_DISPLAY_ALL]);
1946
1947 if (try_module_get(THIS_MODULE))
1948 return xprt;
1949
1950 kfree(xprt->slot);
1951 kfree(xprt);
1952 return ERR_PTR(-EINVAL);
1953 }
1954
1955 static struct xprt_class xs_udp_transport = {
1956 .list = LIST_HEAD_INIT(xs_udp_transport.list),
1957 .name = "udp",
1958 .owner = THIS_MODULE,
1959 .ident = IPPROTO_UDP,
1960 .setup = xs_setup_udp,
1961 };
1962
1963 static struct xprt_class xs_tcp_transport = {
1964 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
1965 .name = "tcp",
1966 .owner = THIS_MODULE,
1967 .ident = IPPROTO_TCP,
1968 .setup = xs_setup_tcp,
1969 };
1970
1971 /**
1972 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
1973 *
1974 */
1975 int init_socket_xprt(void)
1976 {
1977 #ifdef RPC_DEBUG
1978 if (!sunrpc_table_header)
1979 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1980 #endif
1981
1982 xprt_register_transport(&xs_udp_transport);
1983 xprt_register_transport(&xs_tcp_transport);
1984
1985 return 0;
1986 }
1987
1988 /**
1989 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
1990 *
1991 */
1992 void cleanup_socket_xprt(void)
1993 {
1994 #ifdef RPC_DEBUG
1995 if (sunrpc_table_header) {
1996 unregister_sysctl_table(sunrpc_table_header);
1997 sunrpc_table_header = NULL;
1998 }
1999 #endif
2000
2001 xprt_unregister_transport(&xs_udp_transport);
2002 xprt_unregister_transport(&xs_tcp_transport);
2003 }
WRT350N Kernel Patches