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[UDP]: Restore missing inDatagrams increments
[linux-2.6.git] / net / sunrpc / xprtsock.c
blob6fa52f44de0fd1b43f8630ae7d50ef0805be06a1
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 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
843 goto out_unlock;
844 }
845
846 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
847
848 /* Something worked... */
849 dst_confirm(skb->dst);
850
851 xprt_adjust_cwnd(task, copied);
852 xprt_update_rtt(task);
853 xprt_complete_rqst(task, copied);
854
855 out_unlock:
856 spin_unlock(&xprt->transport_lock);
857 dropit:
858 skb_free_datagram(sk, skb);
859 out:
860 read_unlock(&sk->sk_callback_lock);
861 }
862
863 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
864 {
865 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
866 size_t len, used;
867 char *p;
868
869 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
870 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
871 used = xdr_skb_read_bits(desc, p, len);
872 transport->tcp_offset += used;
873 if (used != len)
874 return;
875
876 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
877 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
878 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
879 else
880 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
881 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
882
883 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
884 transport->tcp_offset = 0;
885
886 /* Sanity check of the record length */
887 if (unlikely(transport->tcp_reclen < 4)) {
888 dprintk("RPC: invalid TCP record fragment length\n");
889 xprt_disconnect(xprt);
890 return;
891 }
892 dprintk("RPC: reading TCP record fragment of length %d\n",
893 transport->tcp_reclen);
894 }
895
896 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
897 {
898 if (transport->tcp_offset == transport->tcp_reclen) {
899 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
900 transport->tcp_offset = 0;
901 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
902 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
903 transport->tcp_flags |= TCP_RCV_COPY_XID;
904 transport->tcp_copied = 0;
905 }
906 }
907 }
908
909 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
910 {
911 size_t len, used;
912 char *p;
913
914 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
915 dprintk("RPC: reading XID (%Zu bytes)\n", len);
916 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
917 used = xdr_skb_read_bits(desc, p, len);
918 transport->tcp_offset += used;
919 if (used != len)
920 return;
921 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
922 transport->tcp_flags |= TCP_RCV_COPY_DATA;
923 transport->tcp_copied = 4;
924 dprintk("RPC: reading reply for XID %08x\n",
925 ntohl(transport->tcp_xid));
926 xs_tcp_check_fraghdr(transport);
927 }
928
929 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
930 {
931 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
932 struct rpc_rqst *req;
933 struct xdr_buf *rcvbuf;
934 size_t len;
935 ssize_t r;
936
937 /* Find and lock the request corresponding to this xid */
938 spin_lock(&xprt->transport_lock);
939 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
940 if (!req) {
941 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
942 dprintk("RPC: XID %08x request not found!\n",
943 ntohl(transport->tcp_xid));
944 spin_unlock(&xprt->transport_lock);
945 return;
946 }
947
948 rcvbuf = &req->rq_private_buf;
949 len = desc->count;
950 if (len > transport->tcp_reclen - transport->tcp_offset) {
951 struct xdr_skb_reader my_desc;
952
953 len = transport->tcp_reclen - transport->tcp_offset;
954 memcpy(&my_desc, desc, sizeof(my_desc));
955 my_desc.count = len;
956 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
957 &my_desc, xdr_skb_read_bits);
958 desc->count -= r;
959 desc->offset += r;
960 } else
961 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
962 desc, xdr_skb_read_bits);
963
964 if (r > 0) {
965 transport->tcp_copied += r;
966 transport->tcp_offset += r;
967 }
968 if (r != len) {
969 /* Error when copying to the receive buffer,
970 * usually because we weren't able to allocate
971 * additional buffer pages. All we can do now
972 * is turn off TCP_RCV_COPY_DATA, so the request
973 * will not receive any additional updates,
974 * and time out.
975 * Any remaining data from this record will
976 * be discarded.
977 */
978 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
979 dprintk("RPC: XID %08x truncated request\n",
980 ntohl(transport->tcp_xid));
981 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
982 "tcp_offset = %u, tcp_reclen = %u\n",
983 xprt, transport->tcp_copied,
984 transport->tcp_offset, transport->tcp_reclen);
985 goto out;
986 }
987
988 dprintk("RPC: XID %08x read %Zd bytes\n",
989 ntohl(transport->tcp_xid), r);
990 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
991 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
992 transport->tcp_offset, transport->tcp_reclen);
993
994 if (transport->tcp_copied == req->rq_private_buf.buflen)
995 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
996 else if (transport->tcp_offset == transport->tcp_reclen) {
997 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
998 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
999 }
1000
1001 out:
1002 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1003 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1004 spin_unlock(&xprt->transport_lock);
1005 xs_tcp_check_fraghdr(transport);
1006 }
1007
1008 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1009 {
1010 size_t len;
1011
1012 len = transport->tcp_reclen - transport->tcp_offset;
1013 if (len > desc->count)
1014 len = desc->count;
1015 desc->count -= len;
1016 desc->offset += len;
1017 transport->tcp_offset += len;
1018 dprintk("RPC: discarded %Zu bytes\n", len);
1019 xs_tcp_check_fraghdr(transport);
1020 }
1021
1022 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1023 {
1024 struct rpc_xprt *xprt = rd_desc->arg.data;
1025 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1026 struct xdr_skb_reader desc = {
1027 .skb = skb,
1028 .offset = offset,
1029 .count = len,
1030 };
1031
1032 dprintk("RPC: xs_tcp_data_recv started\n");
1033 do {
1034 /* Read in a new fragment marker if necessary */
1035 /* Can we ever really expect to get completely empty fragments? */
1036 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1037 xs_tcp_read_fraghdr(xprt, &desc);
1038 continue;
1039 }
1040 /* Read in the xid if necessary */
1041 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1042 xs_tcp_read_xid(transport, &desc);
1043 continue;
1044 }
1045 /* Read in the request data */
1046 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1047 xs_tcp_read_request(xprt, &desc);
1048 continue;
1049 }
1050 /* Skip over any trailing bytes on short reads */
1051 xs_tcp_read_discard(transport, &desc);
1052 } while (desc.count);
1053 dprintk("RPC: xs_tcp_data_recv done\n");
1054 return len - desc.count;
1055 }
1056
1057 /**
1058 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1059 * @sk: socket with data to read
1060 * @bytes: how much data to read
1061 *
1062 */
1063 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1064 {
1065 struct rpc_xprt *xprt;
1066 read_descriptor_t rd_desc;
1067
1068 dprintk("RPC: xs_tcp_data_ready...\n");
1069
1070 read_lock(&sk->sk_callback_lock);
1071 if (!(xprt = xprt_from_sock(sk)))
1072 goto out;
1073 if (xprt->shutdown)
1074 goto out;
1075
1076 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1077 rd_desc.arg.data = xprt;
1078 rd_desc.count = 65536;
1079 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1080 out:
1081 read_unlock(&sk->sk_callback_lock);
1082 }
1083
1084 /**
1085 * xs_tcp_state_change - callback to handle TCP socket state changes
1086 * @sk: socket whose state has changed
1087 *
1088 */
1089 static void xs_tcp_state_change(struct sock *sk)
1090 {
1091 struct rpc_xprt *xprt;
1092
1093 read_lock(&sk->sk_callback_lock);
1094 if (!(xprt = xprt_from_sock(sk)))
1095 goto out;
1096 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1097 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1098 sk->sk_state, xprt_connected(xprt),
1099 sock_flag(sk, SOCK_DEAD),
1100 sock_flag(sk, SOCK_ZAPPED));
1101
1102 switch (sk->sk_state) {
1103 case TCP_ESTABLISHED:
1104 spin_lock_bh(&xprt->transport_lock);
1105 if (!xprt_test_and_set_connected(xprt)) {
1106 struct sock_xprt *transport = container_of(xprt,
1107 struct sock_xprt, xprt);
1108
1109 /* Reset TCP record info */
1110 transport->tcp_offset = 0;
1111 transport->tcp_reclen = 0;
1112 transport->tcp_copied = 0;
1113 transport->tcp_flags =
1114 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1115
1116 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1117 xprt_wake_pending_tasks(xprt, 0);
1118 }
1119 spin_unlock_bh(&xprt->transport_lock);
1120 break;
1121 case TCP_SYN_SENT:
1122 case TCP_SYN_RECV:
1123 break;
1124 case TCP_CLOSE_WAIT:
1125 /* Try to schedule an autoclose RPC calls */
1126 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1127 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1128 queue_work(rpciod_workqueue, &xprt->task_cleanup);
1129 default:
1130 xprt_disconnect(xprt);
1131 }
1132 out:
1133 read_unlock(&sk->sk_callback_lock);
1134 }
1135
1136 /**
1137 * xs_udp_write_space - callback invoked when socket buffer space
1138 * becomes available
1139 * @sk: socket whose state has changed
1140 *
1141 * Called when more output buffer space is available for this socket.
1142 * We try not to wake our writers until they can make "significant"
1143 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1144 * with a bunch of small requests.
1145 */
1146 static void xs_udp_write_space(struct sock *sk)
1147 {
1148 read_lock(&sk->sk_callback_lock);
1149
1150 /* from net/core/sock.c:sock_def_write_space */
1151 if (sock_writeable(sk)) {
1152 struct socket *sock;
1153 struct rpc_xprt *xprt;
1154
1155 if (unlikely(!(sock = sk->sk_socket)))
1156 goto out;
1157 if (unlikely(!(xprt = xprt_from_sock(sk))))
1158 goto out;
1159 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1160 goto out;
1161
1162 xprt_write_space(xprt);
1163 }
1164
1165 out:
1166 read_unlock(&sk->sk_callback_lock);
1167 }
1168
1169 /**
1170 * xs_tcp_write_space - callback invoked when socket buffer space
1171 * becomes available
1172 * @sk: socket whose state has changed
1173 *
1174 * Called when more output buffer space is available for this socket.
1175 * We try not to wake our writers until they can make "significant"
1176 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1177 * with a bunch of small requests.
1178 */
1179 static void xs_tcp_write_space(struct sock *sk)
1180 {
1181 read_lock(&sk->sk_callback_lock);
1182
1183 /* from net/core/stream.c:sk_stream_write_space */
1184 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1185 struct socket *sock;
1186 struct rpc_xprt *xprt;
1187
1188 if (unlikely(!(sock = sk->sk_socket)))
1189 goto out;
1190 if (unlikely(!(xprt = xprt_from_sock(sk))))
1191 goto out;
1192 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1193 goto out;
1194
1195 xprt_write_space(xprt);
1196 }
1197
1198 out:
1199 read_unlock(&sk->sk_callback_lock);
1200 }
1201
1202 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1203 {
1204 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1205 struct sock *sk = transport->inet;
1206
1207 if (transport->rcvsize) {
1208 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1209 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1210 }
1211 if (transport->sndsize) {
1212 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1213 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1214 sk->sk_write_space(sk);
1215 }
1216 }
1217
1218 /**
1219 * xs_udp_set_buffer_size - set send and receive limits
1220 * @xprt: generic transport
1221 * @sndsize: requested size of send buffer, in bytes
1222 * @rcvsize: requested size of receive buffer, in bytes
1223 *
1224 * Set socket send and receive buffer size limits.
1225 */
1226 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1227 {
1228 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1229
1230 transport->sndsize = 0;
1231 if (sndsize)
1232 transport->sndsize = sndsize + 1024;
1233 transport->rcvsize = 0;
1234 if (rcvsize)
1235 transport->rcvsize = rcvsize + 1024;
1236
1237 xs_udp_do_set_buffer_size(xprt);
1238 }
1239
1240 /**
1241 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1242 * @task: task that timed out
1243 *
1244 * Adjust the congestion window after a retransmit timeout has occurred.
1245 */
1246 static void xs_udp_timer(struct rpc_task *task)
1247 {
1248 xprt_adjust_cwnd(task, -ETIMEDOUT);
1249 }
1250
1251 static unsigned short xs_get_random_port(void)
1252 {
1253 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1254 unsigned short rand = (unsigned short) net_random() % range;
1255 return rand + xprt_min_resvport;
1256 }
1257
1258 /**
1259 * xs_set_port - reset the port number in the remote endpoint address
1260 * @xprt: generic transport
1261 * @port: new port number
1262 *
1263 */
1264 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1265 {
1266 struct sockaddr *addr = xs_addr(xprt);
1267
1268 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1269
1270 switch (addr->sa_family) {
1271 case AF_INET:
1272 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1273 break;
1274 case AF_INET6:
1275 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1276 break;
1277 default:
1278 BUG();
1279 }
1280 }
1281
1282 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1283 {
1284 struct sockaddr_in myaddr = {
1285 .sin_family = AF_INET,
1286 };
1287 struct sockaddr_in *sa;
1288 int err;
1289 unsigned short port = transport->port;
1290
1291 if (!transport->xprt.resvport)
1292 port = 0;
1293 sa = (struct sockaddr_in *)&transport->addr;
1294 myaddr.sin_addr = sa->sin_addr;
1295 do {
1296 myaddr.sin_port = htons(port);
1297 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1298 sizeof(myaddr));
1299 if (!transport->xprt.resvport)
1300 break;
1301 if (err == 0) {
1302 transport->port = port;
1303 break;
1304 }
1305 if (port <= xprt_min_resvport)
1306 port = xprt_max_resvport;
1307 else
1308 port--;
1309 } while (err == -EADDRINUSE && port != transport->port);
1310 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1311 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1312 port, err ? "failed" : "ok", err);
1313 return err;
1314 }
1315
1316 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1317 {
1318 struct sockaddr_in6 myaddr = {
1319 .sin6_family = AF_INET6,
1320 };
1321 struct sockaddr_in6 *sa;
1322 int err;
1323 unsigned short port = transport->port;
1324
1325 if (!transport->xprt.resvport)
1326 port = 0;
1327 sa = (struct sockaddr_in6 *)&transport->addr;
1328 myaddr.sin6_addr = sa->sin6_addr;
1329 do {
1330 myaddr.sin6_port = htons(port);
1331 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1332 sizeof(myaddr));
1333 if (!transport->xprt.resvport)
1334 break;
1335 if (err == 0) {
1336 transport->port = port;
1337 break;
1338 }
1339 if (port <= xprt_min_resvport)
1340 port = xprt_max_resvport;
1341 else
1342 port--;
1343 } while (err == -EADDRINUSE && port != transport->port);
1344 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1345 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1346 return err;
1347 }
1348
1349 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1350 static struct lock_class_key xs_key[2];
1351 static struct lock_class_key xs_slock_key[2];
1352
1353 static inline void xs_reclassify_socket4(struct socket *sock)
1354 {
1355 struct sock *sk = sock->sk;
1356
1357 BUG_ON(sock_owned_by_user(sk));
1358 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1359 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1360 }
1361
1362 static inline void xs_reclassify_socket6(struct socket *sock)
1363 {
1364 struct sock *sk = sock->sk;
1365
1366 BUG_ON(sock_owned_by_user(sk));
1367 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1368 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1369 }
1370 #else
1371 static inline void xs_reclassify_socket4(struct socket *sock)
1372 {
1373 }
1374
1375 static inline void xs_reclassify_socket6(struct socket *sock)
1376 {
1377 }
1378 #endif
1379
1380 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1381 {
1382 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1383
1384 if (!transport->inet) {
1385 struct sock *sk = sock->sk;
1386
1387 write_lock_bh(&sk->sk_callback_lock);
1388
1389 sk->sk_user_data = xprt;
1390 transport->old_data_ready = sk->sk_data_ready;
1391 transport->old_state_change = sk->sk_state_change;
1392 transport->old_write_space = sk->sk_write_space;
1393 sk->sk_data_ready = xs_udp_data_ready;
1394 sk->sk_write_space = xs_udp_write_space;
1395 sk->sk_no_check = UDP_CSUM_NORCV;
1396 sk->sk_allocation = GFP_ATOMIC;
1397
1398 xprt_set_connected(xprt);
1399
1400 /* Reset to new socket */
1401 transport->sock = sock;
1402 transport->inet = sk;
1403
1404 write_unlock_bh(&sk->sk_callback_lock);
1405 }
1406 xs_udp_do_set_buffer_size(xprt);
1407 }
1408
1409 /**
1410 * xs_udp_connect_worker4 - set up a UDP socket
1411 * @work: RPC transport to connect
1412 *
1413 * Invoked by a work queue tasklet.
1414 */
1415 static void xs_udp_connect_worker4(struct work_struct *work)
1416 {
1417 struct sock_xprt *transport =
1418 container_of(work, struct sock_xprt, connect_worker.work);
1419 struct rpc_xprt *xprt = &transport->xprt;
1420 struct socket *sock = transport->sock;
1421 int err, status = -EIO;
1422
1423 if (xprt->shutdown || !xprt_bound(xprt))
1424 goto out;
1425
1426 /* Start by resetting any existing state */
1427 xs_close(xprt);
1428
1429 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1430 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1431 goto out;
1432 }
1433 xs_reclassify_socket4(sock);
1434
1435 if (xs_bind4(transport, sock)) {
1436 sock_release(sock);
1437 goto out;
1438 }
1439
1440 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1441 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1442
1443 xs_udp_finish_connecting(xprt, sock);
1444 status = 0;
1445 out:
1446 xprt_wake_pending_tasks(xprt, status);
1447 xprt_clear_connecting(xprt);
1448 }
1449
1450 /**
1451 * xs_udp_connect_worker6 - set up a UDP socket
1452 * @work: RPC transport to connect
1453 *
1454 * Invoked by a work queue tasklet.
1455 */
1456 static void xs_udp_connect_worker6(struct work_struct *work)
1457 {
1458 struct sock_xprt *transport =
1459 container_of(work, struct sock_xprt, connect_worker.work);
1460 struct rpc_xprt *xprt = &transport->xprt;
1461 struct socket *sock = transport->sock;
1462 int err, status = -EIO;
1463
1464 if (xprt->shutdown || !xprt_bound(xprt))
1465 goto out;
1466
1467 /* Start by resetting any existing state */
1468 xs_close(xprt);
1469
1470 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1471 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1472 goto out;
1473 }
1474 xs_reclassify_socket6(sock);
1475
1476 if (xs_bind6(transport, sock) < 0) {
1477 sock_release(sock);
1478 goto out;
1479 }
1480
1481 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1482 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1483
1484 xs_udp_finish_connecting(xprt, sock);
1485 status = 0;
1486 out:
1487 xprt_wake_pending_tasks(xprt, status);
1488 xprt_clear_connecting(xprt);
1489 }
1490
1491 /*
1492 * We need to preserve the port number so the reply cache on the server can
1493 * find our cached RPC replies when we get around to reconnecting.
1494 */
1495 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1496 {
1497 int result;
1498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1499 struct sockaddr any;
1500
1501 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1502
1503 /*
1504 * Disconnect the transport socket by doing a connect operation
1505 * with AF_UNSPEC. This should return immediately...
1506 */
1507 memset(&any, 0, sizeof(any));
1508 any.sa_family = AF_UNSPEC;
1509 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1510 if (result)
1511 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1512 result);
1513 }
1514
1515 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1516 {
1517 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1518
1519 if (!transport->inet) {
1520 struct sock *sk = sock->sk;
1521
1522 write_lock_bh(&sk->sk_callback_lock);
1523
1524 sk->sk_user_data = xprt;
1525 transport->old_data_ready = sk->sk_data_ready;
1526 transport->old_state_change = sk->sk_state_change;
1527 transport->old_write_space = sk->sk_write_space;
1528 sk->sk_data_ready = xs_tcp_data_ready;
1529 sk->sk_state_change = xs_tcp_state_change;
1530 sk->sk_write_space = xs_tcp_write_space;
1531 sk->sk_allocation = GFP_ATOMIC;
1532
1533 /* socket options */
1534 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1535 sock_reset_flag(sk, SOCK_LINGER);
1536 tcp_sk(sk)->linger2 = 0;
1537 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1538
1539 xprt_clear_connected(xprt);
1540
1541 /* Reset to new socket */
1542 transport->sock = sock;
1543 transport->inet = sk;
1544
1545 write_unlock_bh(&sk->sk_callback_lock);
1546 }
1547
1548 /* Tell the socket layer to start connecting... */
1549 xprt->stat.connect_count++;
1550 xprt->stat.connect_start = jiffies;
1551 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1552 }
1553
1554 /**
1555 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1556 * @work: RPC transport to connect
1557 *
1558 * Invoked by a work queue tasklet.
1559 */
1560 static void xs_tcp_connect_worker4(struct work_struct *work)
1561 {
1562 struct sock_xprt *transport =
1563 container_of(work, struct sock_xprt, connect_worker.work);
1564 struct rpc_xprt *xprt = &transport->xprt;
1565 struct socket *sock = transport->sock;
1566 int err, status = -EIO;
1567
1568 if (xprt->shutdown || !xprt_bound(xprt))
1569 goto out;
1570
1571 if (!sock) {
1572 /* start from scratch */
1573 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1574 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1575 goto out;
1576 }
1577 xs_reclassify_socket4(sock);
1578
1579 if (xs_bind4(transport, sock) < 0) {
1580 sock_release(sock);
1581 goto out;
1582 }
1583 } else
1584 /* "close" the socket, preserving the local port */
1585 xs_tcp_reuse_connection(xprt);
1586
1587 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1588 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1589
1590 status = xs_tcp_finish_connecting(xprt, sock);
1591 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1592 xprt, -status, xprt_connected(xprt),
1593 sock->sk->sk_state);
1594 if (status < 0) {
1595 switch (status) {
1596 case -EINPROGRESS:
1597 case -EALREADY:
1598 goto out_clear;
1599 case -ECONNREFUSED:
1600 case -ECONNRESET:
1601 /* retry with existing socket, after a delay */
1602 break;
1603 default:
1604 /* get rid of existing socket, and retry */
1605 xs_close(xprt);
1606 break;
1607 }
1608 }
1609 out:
1610 xprt_wake_pending_tasks(xprt, status);
1611 out_clear:
1612 xprt_clear_connecting(xprt);
1613 }
1614
1615 /**
1616 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1617 * @work: RPC transport to connect
1618 *
1619 * Invoked by a work queue tasklet.
1620 */
1621 static void xs_tcp_connect_worker6(struct work_struct *work)
1622 {
1623 struct sock_xprt *transport =
1624 container_of(work, struct sock_xprt, connect_worker.work);
1625 struct rpc_xprt *xprt = &transport->xprt;
1626 struct socket *sock = transport->sock;
1627 int err, status = -EIO;
1628
1629 if (xprt->shutdown || !xprt_bound(xprt))
1630 goto out;
1631
1632 if (!sock) {
1633 /* start from scratch */
1634 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1635 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1636 goto out;
1637 }
1638 xs_reclassify_socket6(sock);
1639
1640 if (xs_bind6(transport, sock) < 0) {
1641 sock_release(sock);
1642 goto out;
1643 }
1644 } else
1645 /* "close" the socket, preserving the local port */
1646 xs_tcp_reuse_connection(xprt);
1647
1648 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1649 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1650
1651 status = xs_tcp_finish_connecting(xprt, sock);
1652 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1653 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1654 if (status < 0) {
1655 switch (status) {
1656 case -EINPROGRESS:
1657 case -EALREADY:
1658 goto out_clear;
1659 case -ECONNREFUSED:
1660 case -ECONNRESET:
1661 /* retry with existing socket, after a delay */
1662 break;
1663 default:
1664 /* get rid of existing socket, and retry */
1665 xs_close(xprt);
1666 break;
1667 }
1668 }
1669 out:
1670 xprt_wake_pending_tasks(xprt, status);
1671 out_clear:
1672 xprt_clear_connecting(xprt);
1673 }
1674
1675 /**
1676 * xs_connect - connect a socket to a remote endpoint
1677 * @task: address of RPC task that manages state of connect request
1678 *
1679 * TCP: If the remote end dropped the connection, delay reconnecting.
1680 *
1681 * UDP socket connects are synchronous, but we use a work queue anyway
1682 * to guarantee that even unprivileged user processes can set up a
1683 * socket on a privileged port.
1684 *
1685 * If a UDP socket connect fails, the delay behavior here prevents
1686 * retry floods (hard mounts).
1687 */
1688 static void xs_connect(struct rpc_task *task)
1689 {
1690 struct rpc_xprt *xprt = task->tk_xprt;
1691 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1692
1693 if (xprt_test_and_set_connecting(xprt))
1694 return;
1695
1696 if (transport->sock != NULL) {
1697 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1698 "seconds\n",
1699 xprt, xprt->reestablish_timeout / HZ);
1700 queue_delayed_work(rpciod_workqueue,
1701 &transport->connect_worker,
1702 xprt->reestablish_timeout);
1703 xprt->reestablish_timeout <<= 1;
1704 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1705 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1706 } else {
1707 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1708 queue_delayed_work(rpciod_workqueue,
1709 &transport->connect_worker, 0);
1710 }
1711 }
1712
1713 /**
1714 * xs_udp_print_stats - display UDP socket-specifc stats
1715 * @xprt: rpc_xprt struct containing statistics
1716 * @seq: output file
1717 *
1718 */
1719 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1720 {
1721 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1722
1723 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1724 transport->port,
1725 xprt->stat.bind_count,
1726 xprt->stat.sends,
1727 xprt->stat.recvs,
1728 xprt->stat.bad_xids,
1729 xprt->stat.req_u,
1730 xprt->stat.bklog_u);
1731 }
1732
1733 /**
1734 * xs_tcp_print_stats - display TCP socket-specifc stats
1735 * @xprt: rpc_xprt struct containing statistics
1736 * @seq: output file
1737 *
1738 */
1739 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1740 {
1741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1742 long idle_time = 0;
1743
1744 if (xprt_connected(xprt))
1745 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1746
1747 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1748 transport->port,
1749 xprt->stat.bind_count,
1750 xprt->stat.connect_count,
1751 xprt->stat.connect_time,
1752 idle_time,
1753 xprt->stat.sends,
1754 xprt->stat.recvs,
1755 xprt->stat.bad_xids,
1756 xprt->stat.req_u,
1757 xprt->stat.bklog_u);
1758 }
1759
1760 static struct rpc_xprt_ops xs_udp_ops = {
1761 .set_buffer_size = xs_udp_set_buffer_size,
1762 .reserve_xprt = xprt_reserve_xprt_cong,
1763 .release_xprt = xprt_release_xprt_cong,
1764 .rpcbind = rpcb_getport_async,
1765 .set_port = xs_set_port,
1766 .connect = xs_connect,
1767 .buf_alloc = rpc_malloc,
1768 .buf_free = rpc_free,
1769 .send_request = xs_udp_send_request,
1770 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1771 .timer = xs_udp_timer,
1772 .release_request = xprt_release_rqst_cong,
1773 .close = xs_close,
1774 .destroy = xs_destroy,
1775 .print_stats = xs_udp_print_stats,
1776 };
1777
1778 static struct rpc_xprt_ops xs_tcp_ops = {
1779 .reserve_xprt = xprt_reserve_xprt,
1780 .release_xprt = xs_tcp_release_xprt,
1781 .rpcbind = rpcb_getport_async,
1782 .set_port = xs_set_port,
1783 .connect = xs_connect,
1784 .buf_alloc = rpc_malloc,
1785 .buf_free = rpc_free,
1786 .send_request = xs_tcp_send_request,
1787 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1788 .close = xs_close,
1789 .destroy = xs_destroy,
1790 .print_stats = xs_tcp_print_stats,
1791 };
1792
1793 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1794 unsigned int slot_table_size)
1795 {
1796 struct rpc_xprt *xprt;
1797 struct sock_xprt *new;
1798
1799 if (args->addrlen > sizeof(xprt->addr)) {
1800 dprintk("RPC: xs_setup_xprt: address too large\n");
1801 return ERR_PTR(-EBADF);
1802 }
1803
1804 new = kzalloc(sizeof(*new), GFP_KERNEL);
1805 if (new == NULL) {
1806 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1807 "rpc_xprt\n");
1808 return ERR_PTR(-ENOMEM);
1809 }
1810 xprt = &new->xprt;
1811
1812 xprt->max_reqs = slot_table_size;
1813 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1814 if (xprt->slot == NULL) {
1815 kfree(xprt);
1816 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1817 "table\n");
1818 return ERR_PTR(-ENOMEM);
1819 }
1820
1821 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1822 xprt->addrlen = args->addrlen;
1823 if (args->srcaddr)
1824 memcpy(&new->addr, args->srcaddr, args->addrlen);
1825 new->port = xs_get_random_port();
1826
1827 return xprt;
1828 }
1829
1830 /**
1831 * xs_setup_udp - Set up transport to use a UDP socket
1832 * @args: rpc transport creation arguments
1833 *
1834 */
1835 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1836 {
1837 struct sockaddr *addr = args->dstaddr;
1838 struct rpc_xprt *xprt;
1839 struct sock_xprt *transport;
1840
1841 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1842 if (IS_ERR(xprt))
1843 return xprt;
1844 transport = container_of(xprt, struct sock_xprt, xprt);
1845
1846 xprt->prot = IPPROTO_UDP;
1847 xprt->tsh_size = 0;
1848 /* XXX: header size can vary due to auth type, IPv6, etc. */
1849 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1850
1851 xprt->bind_timeout = XS_BIND_TO;
1852 xprt->connect_timeout = XS_UDP_CONN_TO;
1853 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1854 xprt->idle_timeout = XS_IDLE_DISC_TO;
1855
1856 xprt->ops = &xs_udp_ops;
1857
1858 if (args->timeout)
1859 xprt->timeout = *args->timeout;
1860 else
1861 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1862
1863 switch (addr->sa_family) {
1864 case AF_INET:
1865 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1866 xprt_set_bound(xprt);
1867
1868 INIT_DELAYED_WORK(&transport->connect_worker,
1869 xs_udp_connect_worker4);
1870 xs_format_ipv4_peer_addresses(xprt);
1871 break;
1872 case AF_INET6:
1873 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1874 xprt_set_bound(xprt);
1875
1876 INIT_DELAYED_WORK(&transport->connect_worker,
1877 xs_udp_connect_worker6);
1878 xs_format_ipv6_peer_addresses(xprt);
1879 break;
1880 default:
1881 kfree(xprt);
1882 return ERR_PTR(-EAFNOSUPPORT);
1883 }
1884
1885 dprintk("RPC: set up transport to address %s\n",
1886 xprt->address_strings[RPC_DISPLAY_ALL]);
1887
1888 if (try_module_get(THIS_MODULE))
1889 return xprt;
1890
1891 kfree(xprt->slot);
1892 kfree(xprt);
1893 return ERR_PTR(-EINVAL);
1894 }
1895
1896 /**
1897 * xs_setup_tcp - Set up transport to use a TCP socket
1898 * @args: rpc transport creation arguments
1899 *
1900 */
1901 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1902 {
1903 struct sockaddr *addr = args->dstaddr;
1904 struct rpc_xprt *xprt;
1905 struct sock_xprt *transport;
1906
1907 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1908 if (IS_ERR(xprt))
1909 return xprt;
1910 transport = container_of(xprt, struct sock_xprt, xprt);
1911
1912 xprt->prot = IPPROTO_TCP;
1913 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1914 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1915
1916 xprt->bind_timeout = XS_BIND_TO;
1917 xprt->connect_timeout = XS_TCP_CONN_TO;
1918 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1919 xprt->idle_timeout = XS_IDLE_DISC_TO;
1920
1921 xprt->ops = &xs_tcp_ops;
1922
1923 if (args->timeout)
1924 xprt->timeout = *args->timeout;
1925 else
1926 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1927
1928 switch (addr->sa_family) {
1929 case AF_INET:
1930 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1931 xprt_set_bound(xprt);
1932
1933 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1934 xs_format_ipv4_peer_addresses(xprt);
1935 break;
1936 case AF_INET6:
1937 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1938 xprt_set_bound(xprt);
1939
1940 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
1941 xs_format_ipv6_peer_addresses(xprt);
1942 break;
1943 default:
1944 kfree(xprt);
1945 return ERR_PTR(-EAFNOSUPPORT);
1946 }
1947
1948 dprintk("RPC: set up transport to address %s\n",
1949 xprt->address_strings[RPC_DISPLAY_ALL]);
1950
1951 if (try_module_get(THIS_MODULE))
1952 return xprt;
1953
1954 kfree(xprt->slot);
1955 kfree(xprt);
1956 return ERR_PTR(-EINVAL);
1957 }
1958
1959 static struct xprt_class xs_udp_transport = {
1960 .list = LIST_HEAD_INIT(xs_udp_transport.list),
1961 .name = "udp",
1962 .owner = THIS_MODULE,
1963 .ident = IPPROTO_UDP,
1964 .setup = xs_setup_udp,
1965 };
1966
1967 static struct xprt_class xs_tcp_transport = {
1968 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
1969 .name = "tcp",
1970 .owner = THIS_MODULE,
1971 .ident = IPPROTO_TCP,
1972 .setup = xs_setup_tcp,
1973 };
1974
1975 /**
1976 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
1977 *
1978 */
1979 int init_socket_xprt(void)
1980 {
1981 #ifdef RPC_DEBUG
1982 if (!sunrpc_table_header)
1983 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1984 #endif
1985
1986 xprt_register_transport(&xs_udp_transport);
1987 xprt_register_transport(&xs_tcp_transport);
1988
1989 return 0;
1990 }
1991
1992 /**
1993 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
1994 *
1995 */
1996 void cleanup_socket_xprt(void)
1997 {
1998 #ifdef RPC_DEBUG
1999 if (sunrpc_table_header) {
2000 unregister_sysctl_table(sunrpc_table_header);
2001 sunrpc_table_header = NULL;
2002 }
2003 #endif
2004
2005 xprt_unregister_transport(&xs_udp_transport);
2006 xprt_unregister_transport(&xs_tcp_transport);
2007 }
Linus' kernel tree