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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / sunrpc / xprtsock.c
blob30e7ac243a90bf2347fc36bdac30004f21e84d40
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 const char *protocol,
285 const char *netid)
286 {
287 struct sockaddr_in *addr = xs_addr_in(xprt);
288 char *buf;
289
290 buf = kzalloc(20, GFP_KERNEL);
291 if (buf) {
292 snprintf(buf, 20, NIPQUAD_FMT,
293 NIPQUAD(addr->sin_addr.s_addr));
294 }
295 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
296
297 buf = kzalloc(8, GFP_KERNEL);
298 if (buf) {
299 snprintf(buf, 8, "%u",
300 ntohs(addr->sin_port));
301 }
302 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
303
304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
305
306 buf = kzalloc(48, GFP_KERNEL);
307 if (buf) {
308 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
309 NIPQUAD(addr->sin_addr.s_addr),
310 ntohs(addr->sin_port),
311 protocol);
312 }
313 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
314
315 buf = kzalloc(10, GFP_KERNEL);
316 if (buf) {
317 snprintf(buf, 10, "%02x%02x%02x%02x",
318 NIPQUAD(addr->sin_addr.s_addr));
319 }
320 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
321
322 buf = kzalloc(8, GFP_KERNEL);
323 if (buf) {
324 snprintf(buf, 8, "%4hx",
325 ntohs(addr->sin_port));
326 }
327 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
328
329 buf = kzalloc(30, GFP_KERNEL);
330 if (buf) {
331 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
332 NIPQUAD(addr->sin_addr.s_addr),
333 ntohs(addr->sin_port) >> 8,
334 ntohs(addr->sin_port) & 0xff);
335 }
336 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
337
338 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
339 }
340
341 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
342 const char *protocol,
343 const char *netid)
344 {
345 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
346 char *buf;
347
348 buf = kzalloc(40, GFP_KERNEL);
349 if (buf) {
350 snprintf(buf, 40, NIP6_FMT,
351 NIP6(addr->sin6_addr));
352 }
353 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
354
355 buf = kzalloc(8, GFP_KERNEL);
356 if (buf) {
357 snprintf(buf, 8, "%u",
358 ntohs(addr->sin6_port));
359 }
360 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
361
362 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
363
364 buf = kzalloc(64, GFP_KERNEL);
365 if (buf) {
366 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
367 NIP6(addr->sin6_addr),
368 ntohs(addr->sin6_port),
369 protocol);
370 }
371 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
372
373 buf = kzalloc(36, GFP_KERNEL);
374 if (buf) {
375 snprintf(buf, 36, NIP6_SEQFMT,
376 NIP6(addr->sin6_addr));
377 }
378 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
379
380 buf = kzalloc(8, GFP_KERNEL);
381 if (buf) {
382 snprintf(buf, 8, "%4hx",
383 ntohs(addr->sin6_port));
384 }
385 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
386
387 buf = kzalloc(50, GFP_KERNEL);
388 if (buf) {
389 snprintf(buf, 50, NIP6_FMT".%u.%u",
390 NIP6(addr->sin6_addr),
391 ntohs(addr->sin6_port) >> 8,
392 ntohs(addr->sin6_port) & 0xff);
393 }
394 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
395
396 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
397 }
398
399 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
400 {
401 unsigned int i;
402
403 for (i = 0; i < RPC_DISPLAY_MAX; i++)
404 switch (i) {
405 case RPC_DISPLAY_PROTO:
406 case RPC_DISPLAY_NETID:
407 continue;
408 default:
409 kfree(xprt->address_strings[i]);
410 }
411 }
412
413 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
414
415 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
416 {
417 struct msghdr msg = {
418 .msg_name = addr,
419 .msg_namelen = addrlen,
420 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
421 };
422 struct kvec iov = {
423 .iov_base = vec->iov_base + base,
424 .iov_len = vec->iov_len - base,
425 };
426
427 if (iov.iov_len != 0)
428 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
429 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
430 }
431
432 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
433 {
434 struct page **ppage;
435 unsigned int remainder;
436 int err, sent = 0;
437
438 remainder = xdr->page_len - base;
439 base += xdr->page_base;
440 ppage = xdr->pages + (base >> PAGE_SHIFT);
441 base &= ~PAGE_MASK;
442 for(;;) {
443 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
444 int flags = XS_SENDMSG_FLAGS;
445
446 remainder -= len;
447 if (remainder != 0 || more)
448 flags |= MSG_MORE;
449 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
450 if (remainder == 0 || err != len)
451 break;
452 sent += err;
453 ppage++;
454 base = 0;
455 }
456 if (sent == 0)
457 return err;
458 if (err > 0)
459 sent += err;
460 return sent;
461 }
462
463 /**
464 * xs_sendpages - write pages directly to a socket
465 * @sock: socket to send on
466 * @addr: UDP only -- address of destination
467 * @addrlen: UDP only -- length of destination address
468 * @xdr: buffer containing this request
469 * @base: starting position in the buffer
470 *
471 */
472 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
473 {
474 unsigned int remainder = xdr->len - base;
475 int err, sent = 0;
476
477 if (unlikely(!sock))
478 return -ENOTCONN;
479
480 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
481 if (base != 0) {
482 addr = NULL;
483 addrlen = 0;
484 }
485
486 if (base < xdr->head[0].iov_len || addr != NULL) {
487 unsigned int len = xdr->head[0].iov_len - base;
488 remainder -= len;
489 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
490 if (remainder == 0 || err != len)
491 goto out;
492 sent += err;
493 base = 0;
494 } else
495 base -= xdr->head[0].iov_len;
496
497 if (base < xdr->page_len) {
498 unsigned int len = xdr->page_len - base;
499 remainder -= len;
500 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
501 if (remainder == 0 || err != len)
502 goto out;
503 sent += err;
504 base = 0;
505 } else
506 base -= xdr->page_len;
507
508 if (base >= xdr->tail[0].iov_len)
509 return sent;
510 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
511 out:
512 if (sent == 0)
513 return err;
514 if (err > 0)
515 sent += err;
516 return sent;
517 }
518
519 /**
520 * xs_nospace - place task on wait queue if transmit was incomplete
521 * @task: task to put to sleep
522 *
523 */
524 static void xs_nospace(struct rpc_task *task)
525 {
526 struct rpc_rqst *req = task->tk_rqstp;
527 struct rpc_xprt *xprt = req->rq_xprt;
528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
529
530 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
531 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
532 req->rq_slen);
533
534 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
535 /* Protect against races with write_space */
536 spin_lock_bh(&xprt->transport_lock);
537
538 /* Don't race with disconnect */
539 if (!xprt_connected(xprt))
540 task->tk_status = -ENOTCONN;
541 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
542 xprt_wait_for_buffer_space(task);
543
544 spin_unlock_bh(&xprt->transport_lock);
545 } else
546 /* Keep holding the socket if it is blocked */
547 rpc_delay(task, HZ>>4);
548 }
549
550 /**
551 * xs_udp_send_request - write an RPC request to a UDP socket
552 * @task: address of RPC task that manages the state of an RPC request
553 *
554 * Return values:
555 * 0: The request has been sent
556 * EAGAIN: The socket was blocked, please call again later to
557 * complete the request
558 * ENOTCONN: Caller needs to invoke connect logic then call again
559 * other: Some other error occured, the request was not sent
560 */
561 static int xs_udp_send_request(struct rpc_task *task)
562 {
563 struct rpc_rqst *req = task->tk_rqstp;
564 struct rpc_xprt *xprt = req->rq_xprt;
565 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
566 struct xdr_buf *xdr = &req->rq_snd_buf;
567 int status;
568
569 xs_pktdump("packet data:",
570 req->rq_svec->iov_base,
571 req->rq_svec->iov_len);
572
573 req->rq_xtime = jiffies;
574 status = xs_sendpages(transport->sock,
575 xs_addr(xprt),
576 xprt->addrlen, xdr,
577 req->rq_bytes_sent);
578
579 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
580 xdr->len - req->rq_bytes_sent, status);
581
582 if (status >= 0) {
583 task->tk_bytes_sent += status;
584 if (status >= req->rq_slen)
585 return 0;
586 /* Still some bytes left; set up for a retry later. */
587 status = -EAGAIN;
588 }
589
590 switch (status) {
591 case -ENETUNREACH:
592 case -EPIPE:
593 case -ECONNREFUSED:
594 /* When the server has died, an ICMP port unreachable message
595 * prompts ECONNREFUSED. */
596 break;
597 case -EAGAIN:
598 xs_nospace(task);
599 break;
600 default:
601 dprintk("RPC: sendmsg returned unrecognized error %d\n",
602 -status);
603 break;
604 }
605
606 return status;
607 }
608
609 /**
610 * xs_tcp_shutdown - gracefully shut down a TCP socket
611 * @xprt: transport
612 *
613 * Initiates a graceful shutdown of the TCP socket by calling the
614 * equivalent of shutdown(SHUT_WR);
615 */
616 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
617 {
618 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
619 struct socket *sock = transport->sock;
620
621 if (sock != NULL)
622 kernel_sock_shutdown(sock, SHUT_WR);
623 }
624
625 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
626 {
627 u32 reclen = buf->len - sizeof(rpc_fraghdr);
628 rpc_fraghdr *base = buf->head[0].iov_base;
629 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
630 }
631
632 /**
633 * xs_tcp_send_request - write an RPC request to a TCP socket
634 * @task: address of RPC task that manages the state of an RPC request
635 *
636 * Return values:
637 * 0: The request has been sent
638 * EAGAIN: The socket was blocked, please call again later to
639 * complete the request
640 * ENOTCONN: Caller needs to invoke connect logic then call again
641 * other: Some other error occured, the request was not sent
642 *
643 * XXX: In the case of soft timeouts, should we eventually give up
644 * if sendmsg is not able to make progress?
645 */
646 static int xs_tcp_send_request(struct rpc_task *task)
647 {
648 struct rpc_rqst *req = task->tk_rqstp;
649 struct rpc_xprt *xprt = req->rq_xprt;
650 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
651 struct xdr_buf *xdr = &req->rq_snd_buf;
652 int status;
653 unsigned int retry = 0;
654
655 xs_encode_tcp_record_marker(&req->rq_snd_buf);
656
657 xs_pktdump("packet data:",
658 req->rq_svec->iov_base,
659 req->rq_svec->iov_len);
660
661 /* Continue transmitting the packet/record. We must be careful
662 * to cope with writespace callbacks arriving _after_ we have
663 * called sendmsg(). */
664 while (1) {
665 req->rq_xtime = jiffies;
666 status = xs_sendpages(transport->sock,
667 NULL, 0, xdr, req->rq_bytes_sent);
668
669 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
670 xdr->len - req->rq_bytes_sent, status);
671
672 if (unlikely(status < 0))
673 break;
674
675 /* If we've sent the entire packet, immediately
676 * reset the count of bytes sent. */
677 req->rq_bytes_sent += status;
678 task->tk_bytes_sent += status;
679 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
680 req->rq_bytes_sent = 0;
681 return 0;
682 }
683
684 status = -EAGAIN;
685 if (retry++ > XS_SENDMSG_RETRY)
686 break;
687 }
688
689 switch (status) {
690 case -EAGAIN:
691 xs_nospace(task);
692 break;
693 case -ECONNREFUSED:
694 case -ECONNRESET:
695 case -ENOTCONN:
696 case -EPIPE:
697 status = -ENOTCONN;
698 break;
699 default:
700 dprintk("RPC: sendmsg returned unrecognized error %d\n",
701 -status);
702 xs_tcp_shutdown(xprt);
703 break;
704 }
705
706 return status;
707 }
708
709 /**
710 * xs_tcp_release_xprt - clean up after a tcp transmission
711 * @xprt: transport
712 * @task: rpc task
713 *
714 * This cleans up if an error causes us to abort the transmission of a request.
715 * In this case, the socket may need to be reset in order to avoid confusing
716 * the server.
717 */
718 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
719 {
720 struct rpc_rqst *req;
721
722 if (task != xprt->snd_task)
723 return;
724 if (task == NULL)
725 goto out_release;
726 req = task->tk_rqstp;
727 if (req->rq_bytes_sent == 0)
728 goto out_release;
729 if (req->rq_bytes_sent == req->rq_snd_buf.len)
730 goto out_release;
731 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
732 out_release:
733 xprt_release_xprt(xprt, task);
734 }
735
736 /**
737 * xs_close - close a socket
738 * @xprt: transport
739 *
740 * This is used when all requests are complete; ie, no DRC state remains
741 * on the server we want to save.
742 */
743 static void xs_close(struct rpc_xprt *xprt)
744 {
745 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
746 struct socket *sock = transport->sock;
747 struct sock *sk = transport->inet;
748
749 if (!sk)
750 goto clear_close_wait;
751
752 dprintk("RPC: xs_close xprt %p\n", xprt);
753
754 write_lock_bh(&sk->sk_callback_lock);
755 transport->inet = NULL;
756 transport->sock = NULL;
757
758 sk->sk_user_data = NULL;
759 sk->sk_data_ready = transport->old_data_ready;
760 sk->sk_state_change = transport->old_state_change;
761 sk->sk_write_space = transport->old_write_space;
762 write_unlock_bh(&sk->sk_callback_lock);
763
764 sk->sk_no_check = 0;
765
766 sock_release(sock);
767 clear_close_wait:
768 smp_mb__before_clear_bit();
769 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
770 clear_bit(XPRT_CLOSING, &xprt->state);
771 smp_mb__after_clear_bit();
772 xprt_disconnect_done(xprt);
773 }
774
775 /**
776 * xs_destroy - prepare to shutdown a transport
777 * @xprt: doomed transport
778 *
779 */
780 static void xs_destroy(struct rpc_xprt *xprt)
781 {
782 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
783
784 dprintk("RPC: xs_destroy xprt %p\n", xprt);
785
786 cancel_rearming_delayed_work(&transport->connect_worker);
787
788 xs_close(xprt);
789 xs_free_peer_addresses(xprt);
790 kfree(xprt->slot);
791 kfree(xprt);
792 module_put(THIS_MODULE);
793 }
794
795 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
796 {
797 return (struct rpc_xprt *) sk->sk_user_data;
798 }
799
800 /**
801 * xs_udp_data_ready - "data ready" callback for UDP sockets
802 * @sk: socket with data to read
803 * @len: how much data to read
804 *
805 */
806 static void xs_udp_data_ready(struct sock *sk, int len)
807 {
808 struct rpc_task *task;
809 struct rpc_xprt *xprt;
810 struct rpc_rqst *rovr;
811 struct sk_buff *skb;
812 int err, repsize, copied;
813 u32 _xid;
814 __be32 *xp;
815
816 read_lock(&sk->sk_callback_lock);
817 dprintk("RPC: xs_udp_data_ready...\n");
818 if (!(xprt = xprt_from_sock(sk)))
819 goto out;
820
821 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
822 goto out;
823
824 if (xprt->shutdown)
825 goto dropit;
826
827 repsize = skb->len - sizeof(struct udphdr);
828 if (repsize < 4) {
829 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
830 goto dropit;
831 }
832
833 /* Copy the XID from the skb... */
834 xp = skb_header_pointer(skb, sizeof(struct udphdr),
835 sizeof(_xid), &_xid);
836 if (xp == NULL)
837 goto dropit;
838
839 /* Look up and lock the request corresponding to the given XID */
840 spin_lock(&xprt->transport_lock);
841 rovr = xprt_lookup_rqst(xprt, *xp);
842 if (!rovr)
843 goto out_unlock;
844 task = rovr->rq_task;
845
846 if ((copied = rovr->rq_private_buf.buflen) > repsize)
847 copied = repsize;
848
849 /* Suck it into the iovec, verify checksum if not done by hw. */
850 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
851 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
852 goto out_unlock;
853 }
854
855 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
856
857 /* Something worked... */
858 dst_confirm(skb->dst);
859
860 xprt_adjust_cwnd(task, copied);
861 xprt_update_rtt(task);
862 xprt_complete_rqst(task, copied);
863
864 out_unlock:
865 spin_unlock(&xprt->transport_lock);
866 dropit:
867 skb_free_datagram(sk, skb);
868 out:
869 read_unlock(&sk->sk_callback_lock);
870 }
871
872 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
873 {
874 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
875 size_t len, used;
876 char *p;
877
878 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
879 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
880 used = xdr_skb_read_bits(desc, p, len);
881 transport->tcp_offset += used;
882 if (used != len)
883 return;
884
885 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
886 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
887 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
888 else
889 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
890 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
891
892 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
893 transport->tcp_offset = 0;
894
895 /* Sanity check of the record length */
896 if (unlikely(transport->tcp_reclen < 4)) {
897 dprintk("RPC: invalid TCP record fragment length\n");
898 xprt_force_disconnect(xprt);
899 return;
900 }
901 dprintk("RPC: reading TCP record fragment of length %d\n",
902 transport->tcp_reclen);
903 }
904
905 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
906 {
907 if (transport->tcp_offset == transport->tcp_reclen) {
908 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
909 transport->tcp_offset = 0;
910 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
911 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
912 transport->tcp_flags |= TCP_RCV_COPY_XID;
913 transport->tcp_copied = 0;
914 }
915 }
916 }
917
918 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
919 {
920 size_t len, used;
921 char *p;
922
923 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
924 dprintk("RPC: reading XID (%Zu bytes)\n", len);
925 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
926 used = xdr_skb_read_bits(desc, p, len);
927 transport->tcp_offset += used;
928 if (used != len)
929 return;
930 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
931 transport->tcp_flags |= TCP_RCV_COPY_DATA;
932 transport->tcp_copied = 4;
933 dprintk("RPC: reading reply for XID %08x\n",
934 ntohl(transport->tcp_xid));
935 xs_tcp_check_fraghdr(transport);
936 }
937
938 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
939 {
940 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
941 struct rpc_rqst *req;
942 struct xdr_buf *rcvbuf;
943 size_t len;
944 ssize_t r;
945
946 /* Find and lock the request corresponding to this xid */
947 spin_lock(&xprt->transport_lock);
948 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
949 if (!req) {
950 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
951 dprintk("RPC: XID %08x request not found!\n",
952 ntohl(transport->tcp_xid));
953 spin_unlock(&xprt->transport_lock);
954 return;
955 }
956
957 rcvbuf = &req->rq_private_buf;
958 len = desc->count;
959 if (len > transport->tcp_reclen - transport->tcp_offset) {
960 struct xdr_skb_reader my_desc;
961
962 len = transport->tcp_reclen - transport->tcp_offset;
963 memcpy(&my_desc, desc, sizeof(my_desc));
964 my_desc.count = len;
965 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
966 &my_desc, xdr_skb_read_bits);
967 desc->count -= r;
968 desc->offset += r;
969 } else
970 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
971 desc, xdr_skb_read_bits);
972
973 if (r > 0) {
974 transport->tcp_copied += r;
975 transport->tcp_offset += r;
976 }
977 if (r != len) {
978 /* Error when copying to the receive buffer,
979 * usually because we weren't able to allocate
980 * additional buffer pages. All we can do now
981 * is turn off TCP_RCV_COPY_DATA, so the request
982 * will not receive any additional updates,
983 * and time out.
984 * Any remaining data from this record will
985 * be discarded.
986 */
987 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
988 dprintk("RPC: XID %08x truncated request\n",
989 ntohl(transport->tcp_xid));
990 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
991 "tcp_offset = %u, tcp_reclen = %u\n",
992 xprt, transport->tcp_copied,
993 transport->tcp_offset, transport->tcp_reclen);
994 goto out;
995 }
996
997 dprintk("RPC: XID %08x read %Zd bytes\n",
998 ntohl(transport->tcp_xid), r);
999 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1000 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1001 transport->tcp_offset, transport->tcp_reclen);
1002
1003 if (transport->tcp_copied == req->rq_private_buf.buflen)
1004 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1005 else if (transport->tcp_offset == transport->tcp_reclen) {
1006 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1007 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1008 }
1009
1010 out:
1011 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1012 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1013 spin_unlock(&xprt->transport_lock);
1014 xs_tcp_check_fraghdr(transport);
1015 }
1016
1017 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1018 {
1019 size_t len;
1020
1021 len = transport->tcp_reclen - transport->tcp_offset;
1022 if (len > desc->count)
1023 len = desc->count;
1024 desc->count -= len;
1025 desc->offset += len;
1026 transport->tcp_offset += len;
1027 dprintk("RPC: discarded %Zu bytes\n", len);
1028 xs_tcp_check_fraghdr(transport);
1029 }
1030
1031 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1032 {
1033 struct rpc_xprt *xprt = rd_desc->arg.data;
1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1035 struct xdr_skb_reader desc = {
1036 .skb = skb,
1037 .offset = offset,
1038 .count = len,
1039 };
1040
1041 dprintk("RPC: xs_tcp_data_recv started\n");
1042 do {
1043 /* Read in a new fragment marker if necessary */
1044 /* Can we ever really expect to get completely empty fragments? */
1045 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1046 xs_tcp_read_fraghdr(xprt, &desc);
1047 continue;
1048 }
1049 /* Read in the xid if necessary */
1050 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1051 xs_tcp_read_xid(transport, &desc);
1052 continue;
1053 }
1054 /* Read in the request data */
1055 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1056 xs_tcp_read_request(xprt, &desc);
1057 continue;
1058 }
1059 /* Skip over any trailing bytes on short reads */
1060 xs_tcp_read_discard(transport, &desc);
1061 } while (desc.count);
1062 dprintk("RPC: xs_tcp_data_recv done\n");
1063 return len - desc.count;
1064 }
1065
1066 /**
1067 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1068 * @sk: socket with data to read
1069 * @bytes: how much data to read
1070 *
1071 */
1072 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1073 {
1074 struct rpc_xprt *xprt;
1075 read_descriptor_t rd_desc;
1076
1077 dprintk("RPC: xs_tcp_data_ready...\n");
1078
1079 read_lock(&sk->sk_callback_lock);
1080 if (!(xprt = xprt_from_sock(sk)))
1081 goto out;
1082 if (xprt->shutdown)
1083 goto out;
1084
1085 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1086 rd_desc.arg.data = xprt;
1087 rd_desc.count = 65536;
1088 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1089 out:
1090 read_unlock(&sk->sk_callback_lock);
1091 }
1092
1093 /**
1094 * xs_tcp_state_change - callback to handle TCP socket state changes
1095 * @sk: socket whose state has changed
1096 *
1097 */
1098 static void xs_tcp_state_change(struct sock *sk)
1099 {
1100 struct rpc_xprt *xprt;
1101
1102 read_lock(&sk->sk_callback_lock);
1103 if (!(xprt = xprt_from_sock(sk)))
1104 goto out;
1105 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1106 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1107 sk->sk_state, xprt_connected(xprt),
1108 sock_flag(sk, SOCK_DEAD),
1109 sock_flag(sk, SOCK_ZAPPED));
1110
1111 switch (sk->sk_state) {
1112 case TCP_ESTABLISHED:
1113 spin_lock_bh(&xprt->transport_lock);
1114 if (!xprt_test_and_set_connected(xprt)) {
1115 struct sock_xprt *transport = container_of(xprt,
1116 struct sock_xprt, xprt);
1117
1118 /* Reset TCP record info */
1119 transport->tcp_offset = 0;
1120 transport->tcp_reclen = 0;
1121 transport->tcp_copied = 0;
1122 transport->tcp_flags =
1123 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1124
1125 xprt_wake_pending_tasks(xprt, 0);
1126 }
1127 spin_unlock_bh(&xprt->transport_lock);
1128 break;
1129 case TCP_FIN_WAIT1:
1130 /* The client initiated a shutdown of the socket */
1131 xprt->reestablish_timeout = 0;
1132 set_bit(XPRT_CLOSING, &xprt->state);
1133 smp_mb__before_clear_bit();
1134 clear_bit(XPRT_CONNECTED, &xprt->state);
1135 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1136 smp_mb__after_clear_bit();
1137 break;
1138 case TCP_CLOSE_WAIT:
1139 /* The server initiated a shutdown of the socket */
1140 set_bit(XPRT_CLOSING, &xprt->state);
1141 xprt_force_disconnect(xprt);
1142 case TCP_SYN_SENT:
1143 case TCP_CLOSING:
1144 /*
1145 * If the server closed down the connection, make sure that
1146 * we back off before reconnecting
1147 */
1148 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1149 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1150 break;
1151 case TCP_LAST_ACK:
1152 smp_mb__before_clear_bit();
1153 clear_bit(XPRT_CONNECTED, &xprt->state);
1154 smp_mb__after_clear_bit();
1155 break;
1156 case TCP_CLOSE:
1157 smp_mb__before_clear_bit();
1158 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1159 clear_bit(XPRT_CLOSING, &xprt->state);
1160 smp_mb__after_clear_bit();
1161 /* Mark transport as closed and wake up all pending tasks */
1162 xprt_disconnect_done(xprt);
1163 }
1164 out:
1165 read_unlock(&sk->sk_callback_lock);
1166 }
1167
1168 /**
1169 * xs_udp_write_space - callback invoked when socket buffer space
1170 * becomes available
1171 * @sk: socket whose state has changed
1172 *
1173 * Called when more output buffer space is available for this socket.
1174 * We try not to wake our writers until they can make "significant"
1175 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1176 * with a bunch of small requests.
1177 */
1178 static void xs_udp_write_space(struct sock *sk)
1179 {
1180 read_lock(&sk->sk_callback_lock);
1181
1182 /* from net/core/sock.c:sock_def_write_space */
1183 if (sock_writeable(sk)) {
1184 struct socket *sock;
1185 struct rpc_xprt *xprt;
1186
1187 if (unlikely(!(sock = sk->sk_socket)))
1188 goto out;
1189 if (unlikely(!(xprt = xprt_from_sock(sk))))
1190 goto out;
1191 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1192 goto out;
1193
1194 xprt_write_space(xprt);
1195 }
1196
1197 out:
1198 read_unlock(&sk->sk_callback_lock);
1199 }
1200
1201 /**
1202 * xs_tcp_write_space - callback invoked when socket buffer space
1203 * becomes available
1204 * @sk: socket whose state has changed
1205 *
1206 * Called when more output buffer space is available for this socket.
1207 * We try not to wake our writers until they can make "significant"
1208 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1209 * with a bunch of small requests.
1210 */
1211 static void xs_tcp_write_space(struct sock *sk)
1212 {
1213 read_lock(&sk->sk_callback_lock);
1214
1215 /* from net/core/stream.c:sk_stream_write_space */
1216 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1217 struct socket *sock;
1218 struct rpc_xprt *xprt;
1219
1220 if (unlikely(!(sock = sk->sk_socket)))
1221 goto out;
1222 if (unlikely(!(xprt = xprt_from_sock(sk))))
1223 goto out;
1224 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1225 goto out;
1226
1227 xprt_write_space(xprt);
1228 }
1229
1230 out:
1231 read_unlock(&sk->sk_callback_lock);
1232 }
1233
1234 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1235 {
1236 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1237 struct sock *sk = transport->inet;
1238
1239 if (transport->rcvsize) {
1240 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1241 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1242 }
1243 if (transport->sndsize) {
1244 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1245 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1246 sk->sk_write_space(sk);
1247 }
1248 }
1249
1250 /**
1251 * xs_udp_set_buffer_size - set send and receive limits
1252 * @xprt: generic transport
1253 * @sndsize: requested size of send buffer, in bytes
1254 * @rcvsize: requested size of receive buffer, in bytes
1255 *
1256 * Set socket send and receive buffer size limits.
1257 */
1258 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1259 {
1260 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1261
1262 transport->sndsize = 0;
1263 if (sndsize)
1264 transport->sndsize = sndsize + 1024;
1265 transport->rcvsize = 0;
1266 if (rcvsize)
1267 transport->rcvsize = rcvsize + 1024;
1268
1269 xs_udp_do_set_buffer_size(xprt);
1270 }
1271
1272 /**
1273 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1274 * @task: task that timed out
1275 *
1276 * Adjust the congestion window after a retransmit timeout has occurred.
1277 */
1278 static void xs_udp_timer(struct rpc_task *task)
1279 {
1280 xprt_adjust_cwnd(task, -ETIMEDOUT);
1281 }
1282
1283 static unsigned short xs_get_random_port(void)
1284 {
1285 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1286 unsigned short rand = (unsigned short) net_random() % range;
1287 return rand + xprt_min_resvport;
1288 }
1289
1290 /**
1291 * xs_set_port - reset the port number in the remote endpoint address
1292 * @xprt: generic transport
1293 * @port: new port number
1294 *
1295 */
1296 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1297 {
1298 struct sockaddr *addr = xs_addr(xprt);
1299
1300 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1301
1302 switch (addr->sa_family) {
1303 case AF_INET:
1304 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1305 break;
1306 case AF_INET6:
1307 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1308 break;
1309 default:
1310 BUG();
1311 }
1312 }
1313
1314 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1315 {
1316 unsigned short port = transport->port;
1317
1318 if (port == 0 && transport->xprt.resvport)
1319 port = xs_get_random_port();
1320 return port;
1321 }
1322
1323 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1324 {
1325 if (transport->port != 0)
1326 transport->port = 0;
1327 if (!transport->xprt.resvport)
1328 return 0;
1329 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1330 return xprt_max_resvport;
1331 return --port;
1332 }
1333
1334 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1335 {
1336 struct sockaddr_in myaddr = {
1337 .sin_family = AF_INET,
1338 };
1339 struct sockaddr_in *sa;
1340 int err, nloop = 0;
1341 unsigned short port = xs_get_srcport(transport, sock);
1342 unsigned short last;
1343
1344 sa = (struct sockaddr_in *)&transport->addr;
1345 myaddr.sin_addr = sa->sin_addr;
1346 do {
1347 myaddr.sin_port = htons(port);
1348 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1349 sizeof(myaddr));
1350 if (port == 0)
1351 break;
1352 if (err == 0) {
1353 transport->port = port;
1354 break;
1355 }
1356 last = port;
1357 port = xs_next_srcport(transport, sock, port);
1358 if (port > last)
1359 nloop++;
1360 } while (err == -EADDRINUSE && nloop != 2);
1361 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1362 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1363 port, err ? "failed" : "ok", err);
1364 return err;
1365 }
1366
1367 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1368 {
1369 struct sockaddr_in6 myaddr = {
1370 .sin6_family = AF_INET6,
1371 };
1372 struct sockaddr_in6 *sa;
1373 int err, nloop = 0;
1374 unsigned short port = xs_get_srcport(transport, sock);
1375 unsigned short last;
1376
1377 sa = (struct sockaddr_in6 *)&transport->addr;
1378 myaddr.sin6_addr = sa->sin6_addr;
1379 do {
1380 myaddr.sin6_port = htons(port);
1381 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1382 sizeof(myaddr));
1383 if (port == 0)
1384 break;
1385 if (err == 0) {
1386 transport->port = port;
1387 break;
1388 }
1389 last = port;
1390 port = xs_next_srcport(transport, sock, port);
1391 if (port > last)
1392 nloop++;
1393 } while (err == -EADDRINUSE && nloop != 2);
1394 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1395 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1396 return err;
1397 }
1398
1399 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1400 static struct lock_class_key xs_key[2];
1401 static struct lock_class_key xs_slock_key[2];
1402
1403 static inline void xs_reclassify_socket4(struct socket *sock)
1404 {
1405 struct sock *sk = sock->sk;
1406
1407 BUG_ON(sock_owned_by_user(sk));
1408 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1409 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1410 }
1411
1412 static inline void xs_reclassify_socket6(struct socket *sock)
1413 {
1414 struct sock *sk = sock->sk;
1415
1416 BUG_ON(sock_owned_by_user(sk));
1417 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1418 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1419 }
1420 #else
1421 static inline void xs_reclassify_socket4(struct socket *sock)
1422 {
1423 }
1424
1425 static inline void xs_reclassify_socket6(struct socket *sock)
1426 {
1427 }
1428 #endif
1429
1430 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1431 {
1432 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1433
1434 if (!transport->inet) {
1435 struct sock *sk = sock->sk;
1436
1437 write_lock_bh(&sk->sk_callback_lock);
1438
1439 sk->sk_user_data = xprt;
1440 transport->old_data_ready = sk->sk_data_ready;
1441 transport->old_state_change = sk->sk_state_change;
1442 transport->old_write_space = sk->sk_write_space;
1443 sk->sk_data_ready = xs_udp_data_ready;
1444 sk->sk_write_space = xs_udp_write_space;
1445 sk->sk_no_check = UDP_CSUM_NORCV;
1446 sk->sk_allocation = GFP_ATOMIC;
1447
1448 xprt_set_connected(xprt);
1449
1450 /* Reset to new socket */
1451 transport->sock = sock;
1452 transport->inet = sk;
1453
1454 write_unlock_bh(&sk->sk_callback_lock);
1455 }
1456 xs_udp_do_set_buffer_size(xprt);
1457 }
1458
1459 /**
1460 * xs_udp_connect_worker4 - set up a UDP socket
1461 * @work: RPC transport to connect
1462 *
1463 * Invoked by a work queue tasklet.
1464 */
1465 static void xs_udp_connect_worker4(struct work_struct *work)
1466 {
1467 struct sock_xprt *transport =
1468 container_of(work, struct sock_xprt, connect_worker.work);
1469 struct rpc_xprt *xprt = &transport->xprt;
1470 struct socket *sock = transport->sock;
1471 int err, status = -EIO;
1472
1473 if (xprt->shutdown || !xprt_bound(xprt))
1474 goto out;
1475
1476 /* Start by resetting any existing state */
1477 xs_close(xprt);
1478
1479 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1480 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1481 goto out;
1482 }
1483 xs_reclassify_socket4(sock);
1484
1485 if (xs_bind4(transport, sock)) {
1486 sock_release(sock);
1487 goto out;
1488 }
1489
1490 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1491 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1492
1493 xs_udp_finish_connecting(xprt, sock);
1494 status = 0;
1495 out:
1496 xprt_wake_pending_tasks(xprt, status);
1497 xprt_clear_connecting(xprt);
1498 }
1499
1500 /**
1501 * xs_udp_connect_worker6 - set up a UDP socket
1502 * @work: RPC transport to connect
1503 *
1504 * Invoked by a work queue tasklet.
1505 */
1506 static void xs_udp_connect_worker6(struct work_struct *work)
1507 {
1508 struct sock_xprt *transport =
1509 container_of(work, struct sock_xprt, connect_worker.work);
1510 struct rpc_xprt *xprt = &transport->xprt;
1511 struct socket *sock = transport->sock;
1512 int err, status = -EIO;
1513
1514 if (xprt->shutdown || !xprt_bound(xprt))
1515 goto out;
1516
1517 /* Start by resetting any existing state */
1518 xs_close(xprt);
1519
1520 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1521 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1522 goto out;
1523 }
1524 xs_reclassify_socket6(sock);
1525
1526 if (xs_bind6(transport, sock) < 0) {
1527 sock_release(sock);
1528 goto out;
1529 }
1530
1531 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1532 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1533
1534 xs_udp_finish_connecting(xprt, sock);
1535 status = 0;
1536 out:
1537 xprt_wake_pending_tasks(xprt, status);
1538 xprt_clear_connecting(xprt);
1539 }
1540
1541 /*
1542 * We need to preserve the port number so the reply cache on the server can
1543 * find our cached RPC replies when we get around to reconnecting.
1544 */
1545 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1546 {
1547 int result;
1548 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1549 struct sockaddr any;
1550
1551 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1552
1553 /*
1554 * Disconnect the transport socket by doing a connect operation
1555 * with AF_UNSPEC. This should return immediately...
1556 */
1557 memset(&any, 0, sizeof(any));
1558 any.sa_family = AF_UNSPEC;
1559 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1560 if (result)
1561 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1562 result);
1563 }
1564
1565 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1566 {
1567 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1568
1569 if (!transport->inet) {
1570 struct sock *sk = sock->sk;
1571
1572 write_lock_bh(&sk->sk_callback_lock);
1573
1574 sk->sk_user_data = xprt;
1575 transport->old_data_ready = sk->sk_data_ready;
1576 transport->old_state_change = sk->sk_state_change;
1577 transport->old_write_space = sk->sk_write_space;
1578 sk->sk_data_ready = xs_tcp_data_ready;
1579 sk->sk_state_change = xs_tcp_state_change;
1580 sk->sk_write_space = xs_tcp_write_space;
1581 sk->sk_allocation = GFP_ATOMIC;
1582
1583 /* socket options */
1584 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1585 sock_reset_flag(sk, SOCK_LINGER);
1586 tcp_sk(sk)->linger2 = 0;
1587 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1588
1589 xprt_clear_connected(xprt);
1590
1591 /* Reset to new socket */
1592 transport->sock = sock;
1593 transport->inet = sk;
1594
1595 write_unlock_bh(&sk->sk_callback_lock);
1596 }
1597
1598 /* Tell the socket layer to start connecting... */
1599 xprt->stat.connect_count++;
1600 xprt->stat.connect_start = jiffies;
1601 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1602 }
1603
1604 /**
1605 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1606 * @work: RPC transport to connect
1607 *
1608 * Invoked by a work queue tasklet.
1609 */
1610 static void xs_tcp_connect_worker4(struct work_struct *work)
1611 {
1612 struct sock_xprt *transport =
1613 container_of(work, struct sock_xprt, connect_worker.work);
1614 struct rpc_xprt *xprt = &transport->xprt;
1615 struct socket *sock = transport->sock;
1616 int err, status = -EIO;
1617
1618 if (xprt->shutdown || !xprt_bound(xprt))
1619 goto out;
1620
1621 if (!sock) {
1622 /* start from scratch */
1623 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1624 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1625 goto out;
1626 }
1627 xs_reclassify_socket4(sock);
1628
1629 if (xs_bind4(transport, sock) < 0) {
1630 sock_release(sock);
1631 goto out;
1632 }
1633 } else
1634 /* "close" the socket, preserving the local port */
1635 xs_tcp_reuse_connection(xprt);
1636
1637 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1638 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1639
1640 status = xs_tcp_finish_connecting(xprt, sock);
1641 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1642 xprt, -status, xprt_connected(xprt),
1643 sock->sk->sk_state);
1644 if (status < 0) {
1645 switch (status) {
1646 case -EINPROGRESS:
1647 case -EALREADY:
1648 goto out_clear;
1649 case -ECONNREFUSED:
1650 case -ECONNRESET:
1651 /* retry with existing socket, after a delay */
1652 break;
1653 default:
1654 /* get rid of existing socket, and retry */
1655 xs_tcp_shutdown(xprt);
1656 }
1657 }
1658 out:
1659 xprt_wake_pending_tasks(xprt, status);
1660 out_clear:
1661 xprt_clear_connecting(xprt);
1662 }
1663
1664 /**
1665 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1666 * @work: RPC transport to connect
1667 *
1668 * Invoked by a work queue tasklet.
1669 */
1670 static void xs_tcp_connect_worker6(struct work_struct *work)
1671 {
1672 struct sock_xprt *transport =
1673 container_of(work, struct sock_xprt, connect_worker.work);
1674 struct rpc_xprt *xprt = &transport->xprt;
1675 struct socket *sock = transport->sock;
1676 int err, status = -EIO;
1677
1678 if (xprt->shutdown || !xprt_bound(xprt))
1679 goto out;
1680
1681 if (!sock) {
1682 /* start from scratch */
1683 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1684 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1685 goto out;
1686 }
1687 xs_reclassify_socket6(sock);
1688
1689 if (xs_bind6(transport, sock) < 0) {
1690 sock_release(sock);
1691 goto out;
1692 }
1693 } else
1694 /* "close" the socket, preserving the local port */
1695 xs_tcp_reuse_connection(xprt);
1696
1697 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1698 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1699
1700 status = xs_tcp_finish_connecting(xprt, sock);
1701 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1702 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1703 if (status < 0) {
1704 switch (status) {
1705 case -EINPROGRESS:
1706 case -EALREADY:
1707 goto out_clear;
1708 case -ECONNREFUSED:
1709 case -ECONNRESET:
1710 /* retry with existing socket, after a delay */
1711 break;
1712 default:
1713 /* get rid of existing socket, and retry */
1714 xs_tcp_shutdown(xprt);
1715 }
1716 }
1717 out:
1718 xprt_wake_pending_tasks(xprt, status);
1719 out_clear:
1720 xprt_clear_connecting(xprt);
1721 }
1722
1723 /**
1724 * xs_connect - connect a socket to a remote endpoint
1725 * @task: address of RPC task that manages state of connect request
1726 *
1727 * TCP: If the remote end dropped the connection, delay reconnecting.
1728 *
1729 * UDP socket connects are synchronous, but we use a work queue anyway
1730 * to guarantee that even unprivileged user processes can set up a
1731 * socket on a privileged port.
1732 *
1733 * If a UDP socket connect fails, the delay behavior here prevents
1734 * retry floods (hard mounts).
1735 */
1736 static void xs_connect(struct rpc_task *task)
1737 {
1738 struct rpc_xprt *xprt = task->tk_xprt;
1739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1740
1741 if (xprt_test_and_set_connecting(xprt))
1742 return;
1743
1744 if (transport->sock != NULL) {
1745 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1746 "seconds\n",
1747 xprt, xprt->reestablish_timeout / HZ);
1748 queue_delayed_work(rpciod_workqueue,
1749 &transport->connect_worker,
1750 xprt->reestablish_timeout);
1751 xprt->reestablish_timeout <<= 1;
1752 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1753 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1754 } else {
1755 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1756 queue_delayed_work(rpciod_workqueue,
1757 &transport->connect_worker, 0);
1758 }
1759 }
1760
1761 static void xs_tcp_connect(struct rpc_task *task)
1762 {
1763 struct rpc_xprt *xprt = task->tk_xprt;
1764
1765 /* Initiate graceful shutdown of the socket if not already done */
1766 if (test_bit(XPRT_CONNECTED, &xprt->state))
1767 xs_tcp_shutdown(xprt);
1768 /* Exit if we need to wait for socket shutdown to complete */
1769 if (test_bit(XPRT_CLOSING, &xprt->state))
1770 return;
1771 xs_connect(task);
1772 }
1773
1774 /**
1775 * xs_udp_print_stats - display UDP socket-specifc stats
1776 * @xprt: rpc_xprt struct containing statistics
1777 * @seq: output file
1778 *
1779 */
1780 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1781 {
1782 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1783
1784 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1785 transport->port,
1786 xprt->stat.bind_count,
1787 xprt->stat.sends,
1788 xprt->stat.recvs,
1789 xprt->stat.bad_xids,
1790 xprt->stat.req_u,
1791 xprt->stat.bklog_u);
1792 }
1793
1794 /**
1795 * xs_tcp_print_stats - display TCP socket-specifc stats
1796 * @xprt: rpc_xprt struct containing statistics
1797 * @seq: output file
1798 *
1799 */
1800 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1801 {
1802 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1803 long idle_time = 0;
1804
1805 if (xprt_connected(xprt))
1806 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1807
1808 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1809 transport->port,
1810 xprt->stat.bind_count,
1811 xprt->stat.connect_count,
1812 xprt->stat.connect_time,
1813 idle_time,
1814 xprt->stat.sends,
1815 xprt->stat.recvs,
1816 xprt->stat.bad_xids,
1817 xprt->stat.req_u,
1818 xprt->stat.bklog_u);
1819 }
1820
1821 static struct rpc_xprt_ops xs_udp_ops = {
1822 .set_buffer_size = xs_udp_set_buffer_size,
1823 .reserve_xprt = xprt_reserve_xprt_cong,
1824 .release_xprt = xprt_release_xprt_cong,
1825 .rpcbind = rpcb_getport_async,
1826 .set_port = xs_set_port,
1827 .connect = xs_connect,
1828 .buf_alloc = rpc_malloc,
1829 .buf_free = rpc_free,
1830 .send_request = xs_udp_send_request,
1831 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1832 .timer = xs_udp_timer,
1833 .release_request = xprt_release_rqst_cong,
1834 .close = xs_close,
1835 .destroy = xs_destroy,
1836 .print_stats = xs_udp_print_stats,
1837 };
1838
1839 static struct rpc_xprt_ops xs_tcp_ops = {
1840 .reserve_xprt = xprt_reserve_xprt,
1841 .release_xprt = xs_tcp_release_xprt,
1842 .rpcbind = rpcb_getport_async,
1843 .set_port = xs_set_port,
1844 .connect = xs_tcp_connect,
1845 .buf_alloc = rpc_malloc,
1846 .buf_free = rpc_free,
1847 .send_request = xs_tcp_send_request,
1848 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1849 .close = xs_tcp_shutdown,
1850 .destroy = xs_destroy,
1851 .print_stats = xs_tcp_print_stats,
1852 };
1853
1854 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1855 unsigned int slot_table_size)
1856 {
1857 struct rpc_xprt *xprt;
1858 struct sock_xprt *new;
1859
1860 if (args->addrlen > sizeof(xprt->addr)) {
1861 dprintk("RPC: xs_setup_xprt: address too large\n");
1862 return ERR_PTR(-EBADF);
1863 }
1864
1865 new = kzalloc(sizeof(*new), GFP_KERNEL);
1866 if (new == NULL) {
1867 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1868 "rpc_xprt\n");
1869 return ERR_PTR(-ENOMEM);
1870 }
1871 xprt = &new->xprt;
1872
1873 xprt->max_reqs = slot_table_size;
1874 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1875 if (xprt->slot == NULL) {
1876 kfree(xprt);
1877 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1878 "table\n");
1879 return ERR_PTR(-ENOMEM);
1880 }
1881
1882 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1883 xprt->addrlen = args->addrlen;
1884 if (args->srcaddr)
1885 memcpy(&new->addr, args->srcaddr, args->addrlen);
1886
1887 return xprt;
1888 }
1889
1890 static const struct rpc_timeout xs_udp_default_timeout = {
1891 .to_initval = 5 * HZ,
1892 .to_maxval = 30 * HZ,
1893 .to_increment = 5 * HZ,
1894 .to_retries = 5,
1895 };
1896
1897 /**
1898 * xs_setup_udp - Set up transport to use a UDP socket
1899 * @args: rpc transport creation arguments
1900 *
1901 */
1902 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1903 {
1904 struct sockaddr *addr = args->dstaddr;
1905 struct rpc_xprt *xprt;
1906 struct sock_xprt *transport;
1907
1908 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1909 if (IS_ERR(xprt))
1910 return xprt;
1911 transport = container_of(xprt, struct sock_xprt, xprt);
1912
1913 xprt->prot = IPPROTO_UDP;
1914 xprt->tsh_size = 0;
1915 /* XXX: header size can vary due to auth type, IPv6, etc. */
1916 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1917
1918 xprt->bind_timeout = XS_BIND_TO;
1919 xprt->connect_timeout = XS_UDP_CONN_TO;
1920 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1921 xprt->idle_timeout = XS_IDLE_DISC_TO;
1922
1923 xprt->ops = &xs_udp_ops;
1924
1925 xprt->timeout = &xs_udp_default_timeout;
1926
1927 switch (addr->sa_family) {
1928 case AF_INET:
1929 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1930 xprt_set_bound(xprt);
1931
1932 INIT_DELAYED_WORK(&transport->connect_worker,
1933 xs_udp_connect_worker4);
1934 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
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,
1941 xs_udp_connect_worker6);
1942 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1943 break;
1944 default:
1945 kfree(xprt);
1946 return ERR_PTR(-EAFNOSUPPORT);
1947 }
1948
1949 dprintk("RPC: set up transport to address %s\n",
1950 xprt->address_strings[RPC_DISPLAY_ALL]);
1951
1952 if (try_module_get(THIS_MODULE))
1953 return xprt;
1954
1955 kfree(xprt->slot);
1956 kfree(xprt);
1957 return ERR_PTR(-EINVAL);
1958 }
1959
1960 static const struct rpc_timeout xs_tcp_default_timeout = {
1961 .to_initval = 60 * HZ,
1962 .to_maxval = 60 * HZ,
1963 .to_retries = 2,
1964 };
1965
1966 /**
1967 * xs_setup_tcp - Set up transport to use a TCP socket
1968 * @args: rpc transport creation arguments
1969 *
1970 */
1971 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1972 {
1973 struct sockaddr *addr = args->dstaddr;
1974 struct rpc_xprt *xprt;
1975 struct sock_xprt *transport;
1976
1977 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1978 if (IS_ERR(xprt))
1979 return xprt;
1980 transport = container_of(xprt, struct sock_xprt, xprt);
1981
1982 xprt->prot = IPPROTO_TCP;
1983 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1984 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1985
1986 xprt->bind_timeout = XS_BIND_TO;
1987 xprt->connect_timeout = XS_TCP_CONN_TO;
1988 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1989 xprt->idle_timeout = XS_IDLE_DISC_TO;
1990
1991 xprt->ops = &xs_tcp_ops;
1992 xprt->timeout = &xs_tcp_default_timeout;
1993
1994 switch (addr->sa_family) {
1995 case AF_INET:
1996 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1997 xprt_set_bound(xprt);
1998
1999 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2000 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2001 break;
2002 case AF_INET6:
2003 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2004 xprt_set_bound(xprt);
2005
2006 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2007 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2008 break;
2009 default:
2010 kfree(xprt);
2011 return ERR_PTR(-EAFNOSUPPORT);
2012 }
2013
2014 dprintk("RPC: set up transport to address %s\n",
2015 xprt->address_strings[RPC_DISPLAY_ALL]);
2016
2017 if (try_module_get(THIS_MODULE))
2018 return xprt;
2019
2020 kfree(xprt->slot);
2021 kfree(xprt);
2022 return ERR_PTR(-EINVAL);
2023 }
2024
2025 static struct xprt_class xs_udp_transport = {
2026 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2027 .name = "udp",
2028 .owner = THIS_MODULE,
2029 .ident = IPPROTO_UDP,
2030 .setup = xs_setup_udp,
2031 };
2032
2033 static struct xprt_class xs_tcp_transport = {
2034 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2035 .name = "tcp",
2036 .owner = THIS_MODULE,
2037 .ident = IPPROTO_TCP,
2038 .setup = xs_setup_tcp,
2039 };
2040
2041 /**
2042 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2043 *
2044 */
2045 int init_socket_xprt(void)
2046 {
2047 #ifdef RPC_DEBUG
2048 if (!sunrpc_table_header)
2049 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2050 #endif
2051
2052 xprt_register_transport(&xs_udp_transport);
2053 xprt_register_transport(&xs_tcp_transport);
2054
2055 return 0;
2056 }
2057
2058 /**
2059 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2060 *
2061 */
2062 void cleanup_socket_xprt(void)
2063 {
2064 #ifdef RPC_DEBUG
2065 if (sunrpc_table_header) {
2066 unregister_sysctl_table(sunrpc_table_header);
2067 sunrpc_table_header = NULL;
2068 }
2069 #endif
2070
2071 xprt_unregister_transport(&xs_udp_transport);
2072 xprt_unregister_transport(&xs_tcp_transport);
2073 }
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