projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
SUNRPC: Fix an Oops due to socket not set up yet...
[deliverable/linux.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/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 * Time out for an RPC UDP socket connect. UDP socket connects are
140 * synchronous, but we set a timeout anyway in case of resource
141 * exhaustion on the local host.
142 */
143 #define XS_UDP_CONN_TO (5U * HZ)
144
145 /*
146 * Wait duration for an RPC TCP connection to be established. Solaris
147 * NFS over TCP uses 60 seconds, for example, which is in line with how
148 * long a server takes to reboot.
149 */
150 #define XS_TCP_CONN_TO (60U * HZ)
151
152 /*
153 * Wait duration for a reply from the RPC portmapper.
154 */
155 #define XS_BIND_TO (60U * HZ)
156
157 /*
158 * Delay if a UDP socket connect error occurs. This is most likely some
159 * kind of resource problem on the local host.
160 */
161 #define XS_UDP_REEST_TO (2U * HZ)
162
163 /*
164 * The reestablish timeout allows clients to delay for a bit before attempting
165 * to reconnect to a server that just dropped our connection.
166 *
167 * We implement an exponential backoff when trying to reestablish a TCP
168 * transport connection with the server. Some servers like to drop a TCP
169 * connection when they are overworked, so we start with a short timeout and
170 * increase over time if the server is down or not responding.
171 */
172 #define XS_TCP_INIT_REEST_TO (3U * HZ)
173 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
174
175 /*
176 * TCP idle timeout; client drops the transport socket if it is idle
177 * for this long. Note that we also timeout UDP sockets to prevent
178 * holding port numbers when there is no RPC traffic.
179 */
180 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
181
182 #ifdef RPC_DEBUG
183 # undef RPC_DEBUG_DATA
184 # define RPCDBG_FACILITY RPCDBG_TRANS
185 #endif
186
187 #ifdef RPC_DEBUG_DATA
188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
189 {
190 u8 *buf = (u8 *) packet;
191 int j;
192
193 dprintk("RPC: %s\n", msg);
194 for (j = 0; j < count && j < 128; j += 4) {
195 if (!(j & 31)) {
196 if (j)
197 dprintk("\n");
198 dprintk("0x%04x ", j);
199 }
200 dprintk("%02x%02x%02x%02x ",
201 buf[j], buf[j+1], buf[j+2], buf[j+3]);
202 }
203 dprintk("\n");
204 }
205 #else
206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207 {
208 /* NOP */
209 }
210 #endif
211
212 struct sock_xprt {
213 struct rpc_xprt xprt;
214
215 /*
216 * Network layer
217 */
218 struct socket * sock;
219 struct sock * inet;
220
221 /*
222 * State of TCP reply receive
223 */
224 __be32 tcp_fraghdr,
225 tcp_xid;
226
227 u32 tcp_offset,
228 tcp_reclen;
229
230 unsigned long tcp_copied,
231 tcp_flags;
232
233 /*
234 * Connection of transports
235 */
236 struct delayed_work connect_worker;
237 struct sockaddr_storage addr;
238 unsigned short port;
239
240 /*
241 * UDP socket buffer size parameters
242 */
243 size_t rcvsize,
244 sndsize;
245
246 /*
247 * Saved socket callback addresses
248 */
249 void (*old_data_ready)(struct sock *, int);
250 void (*old_state_change)(struct sock *);
251 void (*old_write_space)(struct sock *);
252 void (*old_error_report)(struct sock *);
253 };
254
255 /*
256 * TCP receive state flags
257 */
258 #define TCP_RCV_LAST_FRAG (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
260 #define TCP_RCV_COPY_XID (1UL << 2)
261 #define TCP_RCV_COPY_DATA (1UL << 3)
262
263 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
264 {
265 return (struct sockaddr *) &xprt->addr;
266 }
267
268 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr_in *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in6 *) &xprt->addr;
276 }
277
278 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
279 const char *protocol,
280 const char *netid)
281 {
282 struct sockaddr_in *addr = xs_addr_in(xprt);
283 char *buf;
284
285 buf = kzalloc(20, GFP_KERNEL);
286 if (buf) {
287 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
288 }
289 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
290
291 buf = kzalloc(8, GFP_KERNEL);
292 if (buf) {
293 snprintf(buf, 8, "%u",
294 ntohs(addr->sin_port));
295 }
296 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
297
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299
300 buf = kzalloc(48, GFP_KERNEL);
301 if (buf) {
302 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
303 &addr->sin_addr.s_addr,
304 ntohs(addr->sin_port),
305 protocol);
306 }
307 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
308
309 buf = kzalloc(10, GFP_KERNEL);
310 if (buf) {
311 snprintf(buf, 10, "%02x%02x%02x%02x",
312 NIPQUAD(addr->sin_addr.s_addr));
313 }
314 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
315
316 buf = kzalloc(8, GFP_KERNEL);
317 if (buf) {
318 snprintf(buf, 8, "%4hx",
319 ntohs(addr->sin_port));
320 }
321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
322
323 buf = kzalloc(30, GFP_KERNEL);
324 if (buf) {
325 snprintf(buf, 30, "%pI4.%u.%u",
326 &addr->sin_addr.s_addr,
327 ntohs(addr->sin_port) >> 8,
328 ntohs(addr->sin_port) & 0xff);
329 }
330 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
331
332 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
333 }
334
335 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
336 const char *protocol,
337 const char *netid)
338 {
339 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
340 char *buf;
341
342 buf = kzalloc(40, GFP_KERNEL);
343 if (buf) {
344 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
345 }
346 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
347
348 buf = kzalloc(8, GFP_KERNEL);
349 if (buf) {
350 snprintf(buf, 8, "%u",
351 ntohs(addr->sin6_port));
352 }
353 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
354
355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356
357 buf = kzalloc(64, GFP_KERNEL);
358 if (buf) {
359 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
360 &addr->sin6_addr,
361 ntohs(addr->sin6_port),
362 protocol);
363 }
364 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
365
366 buf = kzalloc(36, GFP_KERNEL);
367 if (buf)
368 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
369
370 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
371
372 buf = kzalloc(8, GFP_KERNEL);
373 if (buf) {
374 snprintf(buf, 8, "%4hx",
375 ntohs(addr->sin6_port));
376 }
377 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
378
379 buf = kzalloc(50, GFP_KERNEL);
380 if (buf) {
381 snprintf(buf, 50, "%pI6.%u.%u",
382 &addr->sin6_addr,
383 ntohs(addr->sin6_port) >> 8,
384 ntohs(addr->sin6_port) & 0xff);
385 }
386 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
387
388 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
389 }
390
391 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
392 {
393 unsigned int i;
394
395 for (i = 0; i < RPC_DISPLAY_MAX; i++)
396 switch (i) {
397 case RPC_DISPLAY_PROTO:
398 case RPC_DISPLAY_NETID:
399 continue;
400 default:
401 kfree(xprt->address_strings[i]);
402 }
403 }
404
405 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
406
407 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
408 {
409 struct msghdr msg = {
410 .msg_name = addr,
411 .msg_namelen = addrlen,
412 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
413 };
414 struct kvec iov = {
415 .iov_base = vec->iov_base + base,
416 .iov_len = vec->iov_len - base,
417 };
418
419 if (iov.iov_len != 0)
420 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
421 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
422 }
423
424 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
425 {
426 struct page **ppage;
427 unsigned int remainder;
428 int err, sent = 0;
429
430 remainder = xdr->page_len - base;
431 base += xdr->page_base;
432 ppage = xdr->pages + (base >> PAGE_SHIFT);
433 base &= ~PAGE_MASK;
434 for(;;) {
435 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
436 int flags = XS_SENDMSG_FLAGS;
437
438 remainder -= len;
439 if (remainder != 0 || more)
440 flags |= MSG_MORE;
441 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
442 if (remainder == 0 || err != len)
443 break;
444 sent += err;
445 ppage++;
446 base = 0;
447 }
448 if (sent == 0)
449 return err;
450 if (err > 0)
451 sent += err;
452 return sent;
453 }
454
455 /**
456 * xs_sendpages - write pages directly to a socket
457 * @sock: socket to send on
458 * @addr: UDP only -- address of destination
459 * @addrlen: UDP only -- length of destination address
460 * @xdr: buffer containing this request
461 * @base: starting position in the buffer
462 *
463 */
464 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
465 {
466 unsigned int remainder = xdr->len - base;
467 int err, sent = 0;
468
469 if (unlikely(!sock))
470 return -ENOTSOCK;
471
472 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
473 if (base != 0) {
474 addr = NULL;
475 addrlen = 0;
476 }
477
478 if (base < xdr->head[0].iov_len || addr != NULL) {
479 unsigned int len = xdr->head[0].iov_len - base;
480 remainder -= len;
481 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
482 if (remainder == 0 || err != len)
483 goto out;
484 sent += err;
485 base = 0;
486 } else
487 base -= xdr->head[0].iov_len;
488
489 if (base < xdr->page_len) {
490 unsigned int len = xdr->page_len - base;
491 remainder -= len;
492 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
493 if (remainder == 0 || err != len)
494 goto out;
495 sent += err;
496 base = 0;
497 } else
498 base -= xdr->page_len;
499
500 if (base >= xdr->tail[0].iov_len)
501 return sent;
502 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
503 out:
504 if (sent == 0)
505 return err;
506 if (err > 0)
507 sent += err;
508 return sent;
509 }
510
511 static void xs_nospace_callback(struct rpc_task *task)
512 {
513 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
514
515 transport->inet->sk_write_pending--;
516 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
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 /* Protect against races with write_space */
535 spin_lock_bh(&xprt->transport_lock);
536
537 /* Don't race with disconnect */
538 if (xprt_connected(xprt)) {
539 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
540 /*
541 * Notify TCP that we're limited by the application
542 * window size
543 */
544 set_bit(SOCK_NOSPACE, &transport->sock->flags);
545 transport->inet->sk_write_pending++;
546 /* ...and wait for more buffer space */
547 xprt_wait_for_buffer_space(task, xs_nospace_callback);
548 }
549 } else {
550 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
551 task->tk_status = -ENOTCONN;
552 }
553
554 spin_unlock_bh(&xprt->transport_lock);
555 }
556
557 /**
558 * xs_udp_send_request - write an RPC request to a UDP socket
559 * @task: address of RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568 static int xs_udp_send_request(struct rpc_task *task)
569 {
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
573 struct xdr_buf *xdr = &req->rq_snd_buf;
574 int status;
575
576 xs_pktdump("packet data:",
577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
580 status = xs_sendpages(transport->sock,
581 xs_addr(xprt),
582 xprt->addrlen, xdr,
583 req->rq_bytes_sent);
584
585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
586 xdr->len - req->rq_bytes_sent, status);
587
588 if (status >= 0) {
589 task->tk_bytes_sent += status;
590 if (status >= req->rq_slen)
591 return 0;
592 /* Still some bytes left; set up for a retry later. */
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -ENOTSOCK:
598 status = -ENOTCONN;
599 /* Should we call xs_close() here? */
600 break;
601 case -EAGAIN:
602 xs_nospace(task);
603 break;
604 case -ENETUNREACH:
605 case -EPIPE:
606 case -ECONNREFUSED:
607 /* When the server has died, an ICMP port unreachable message
608 * prompts ECONNREFUSED. */
609 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
610 break;
611 default:
612 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
613 dprintk("RPC: sendmsg returned unrecognized error %d\n",
614 -status);
615 }
616
617 return status;
618 }
619
620 /**
621 * xs_tcp_shutdown - gracefully shut down a TCP socket
622 * @xprt: transport
623 *
624 * Initiates a graceful shutdown of the TCP socket by calling the
625 * equivalent of shutdown(SHUT_WR);
626 */
627 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
628 {
629 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
630 struct socket *sock = transport->sock;
631
632 if (sock != NULL)
633 kernel_sock_shutdown(sock, SHUT_WR);
634 }
635
636 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
637 {
638 u32 reclen = buf->len - sizeof(rpc_fraghdr);
639 rpc_fraghdr *base = buf->head[0].iov_base;
640 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
641 }
642
643 /**
644 * xs_tcp_send_request - write an RPC request to a TCP socket
645 * @task: address of RPC task that manages the state of an RPC request
646 *
647 * Return values:
648 * 0: The request has been sent
649 * EAGAIN: The socket was blocked, please call again later to
650 * complete the request
651 * ENOTCONN: Caller needs to invoke connect logic then call again
652 * other: Some other error occured, the request was not sent
653 *
654 * XXX: In the case of soft timeouts, should we eventually give up
655 * if sendmsg is not able to make progress?
656 */
657 static int xs_tcp_send_request(struct rpc_task *task)
658 {
659 struct rpc_rqst *req = task->tk_rqstp;
660 struct rpc_xprt *xprt = req->rq_xprt;
661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
662 struct xdr_buf *xdr = &req->rq_snd_buf;
663 int status;
664
665 xs_encode_tcp_record_marker(&req->rq_snd_buf);
666
667 xs_pktdump("packet data:",
668 req->rq_svec->iov_base,
669 req->rq_svec->iov_len);
670
671 /* Continue transmitting the packet/record. We must be careful
672 * to cope with writespace callbacks arriving _after_ we have
673 * called sendmsg(). */
674 while (1) {
675 status = xs_sendpages(transport->sock,
676 NULL, 0, xdr, req->rq_bytes_sent);
677
678 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
679 xdr->len - req->rq_bytes_sent, status);
680
681 if (unlikely(status < 0))
682 break;
683
684 /* If we've sent the entire packet, immediately
685 * reset the count of bytes sent. */
686 req->rq_bytes_sent += status;
687 task->tk_bytes_sent += status;
688 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
689 req->rq_bytes_sent = 0;
690 return 0;
691 }
692
693 if (status != 0)
694 continue;
695 status = -EAGAIN;
696 break;
697 }
698
699 switch (status) {
700 case -ENOTSOCK:
701 status = -ENOTCONN;
702 /* Should we call xs_close() here? */
703 break;
704 case -EAGAIN:
705 xs_nospace(task);
706 break;
707 case -ECONNRESET:
708 xs_tcp_shutdown(xprt);
709 case -ECONNREFUSED:
710 case -ENOTCONN:
711 case -EPIPE:
712 status = -ENOTCONN;
713 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
714 break;
715 default:
716 dprintk("RPC: sendmsg returned unrecognized error %d\n",
717 -status);
718 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
719 xs_tcp_shutdown(xprt);
720 }
721
722 return status;
723 }
724
725 /**
726 * xs_tcp_release_xprt - clean up after a tcp transmission
727 * @xprt: transport
728 * @task: rpc task
729 *
730 * This cleans up if an error causes us to abort the transmission of a request.
731 * In this case, the socket may need to be reset in order to avoid confusing
732 * the server.
733 */
734 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
735 {
736 struct rpc_rqst *req;
737
738 if (task != xprt->snd_task)
739 return;
740 if (task == NULL)
741 goto out_release;
742 req = task->tk_rqstp;
743 if (req->rq_bytes_sent == 0)
744 goto out_release;
745 if (req->rq_bytes_sent == req->rq_snd_buf.len)
746 goto out_release;
747 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
748 out_release:
749 xprt_release_xprt(xprt, task);
750 }
751
752 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
753 {
754 transport->old_data_ready = sk->sk_data_ready;
755 transport->old_state_change = sk->sk_state_change;
756 transport->old_write_space = sk->sk_write_space;
757 transport->old_error_report = sk->sk_error_report;
758 }
759
760 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
761 {
762 sk->sk_data_ready = transport->old_data_ready;
763 sk->sk_state_change = transport->old_state_change;
764 sk->sk_write_space = transport->old_write_space;
765 sk->sk_error_report = transport->old_error_report;
766 }
767
768 /**
769 * xs_close - close a socket
770 * @xprt: transport
771 *
772 * This is used when all requests are complete; ie, no DRC state remains
773 * on the server we want to save.
774 */
775 static void xs_close(struct rpc_xprt *xprt)
776 {
777 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
778 struct socket *sock = transport->sock;
779 struct sock *sk = transport->inet;
780
781 if (!sk)
782 goto clear_close_wait;
783
784 dprintk("RPC: xs_close xprt %p\n", xprt);
785
786 write_lock_bh(&sk->sk_callback_lock);
787 transport->inet = NULL;
788 transport->sock = NULL;
789
790 sk->sk_user_data = NULL;
791
792 xs_restore_old_callbacks(transport, sk);
793 write_unlock_bh(&sk->sk_callback_lock);
794
795 sk->sk_no_check = 0;
796
797 sock_release(sock);
798 clear_close_wait:
799 smp_mb__before_clear_bit();
800 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
801 clear_bit(XPRT_CLOSING, &xprt->state);
802 smp_mb__after_clear_bit();
803 xprt_disconnect_done(xprt);
804 }
805
806 /**
807 * xs_destroy - prepare to shutdown a transport
808 * @xprt: doomed transport
809 *
810 */
811 static void xs_destroy(struct rpc_xprt *xprt)
812 {
813 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
814
815 dprintk("RPC: xs_destroy xprt %p\n", xprt);
816
817 cancel_rearming_delayed_work(&transport->connect_worker);
818
819 xs_close(xprt);
820 xs_free_peer_addresses(xprt);
821 kfree(xprt->slot);
822 kfree(xprt);
823 module_put(THIS_MODULE);
824 }
825
826 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
827 {
828 return (struct rpc_xprt *) sk->sk_user_data;
829 }
830
831 /**
832 * xs_udp_data_ready - "data ready" callback for UDP sockets
833 * @sk: socket with data to read
834 * @len: how much data to read
835 *
836 */
837 static void xs_udp_data_ready(struct sock *sk, int len)
838 {
839 struct rpc_task *task;
840 struct rpc_xprt *xprt;
841 struct rpc_rqst *rovr;
842 struct sk_buff *skb;
843 int err, repsize, copied;
844 u32 _xid;
845 __be32 *xp;
846
847 read_lock(&sk->sk_callback_lock);
848 dprintk("RPC: xs_udp_data_ready...\n");
849 if (!(xprt = xprt_from_sock(sk)))
850 goto out;
851
852 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
853 goto out;
854
855 if (xprt->shutdown)
856 goto dropit;
857
858 repsize = skb->len - sizeof(struct udphdr);
859 if (repsize < 4) {
860 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
861 goto dropit;
862 }
863
864 /* Copy the XID from the skb... */
865 xp = skb_header_pointer(skb, sizeof(struct udphdr),
866 sizeof(_xid), &_xid);
867 if (xp == NULL)
868 goto dropit;
869
870 /* Look up and lock the request corresponding to the given XID */
871 spin_lock(&xprt->transport_lock);
872 rovr = xprt_lookup_rqst(xprt, *xp);
873 if (!rovr)
874 goto out_unlock;
875 task = rovr->rq_task;
876
877 if ((copied = rovr->rq_private_buf.buflen) > repsize)
878 copied = repsize;
879
880 /* Suck it into the iovec, verify checksum if not done by hw. */
881 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
882 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
883 goto out_unlock;
884 }
885
886 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
887
888 /* Something worked... */
889 dst_confirm(skb->dst);
890
891 xprt_adjust_cwnd(task, copied);
892 xprt_update_rtt(task);
893 xprt_complete_rqst(task, copied);
894
895 out_unlock:
896 spin_unlock(&xprt->transport_lock);
897 dropit:
898 skb_free_datagram(sk, skb);
899 out:
900 read_unlock(&sk->sk_callback_lock);
901 }
902
903 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
904 {
905 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
906 size_t len, used;
907 char *p;
908
909 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
910 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
911 used = xdr_skb_read_bits(desc, p, len);
912 transport->tcp_offset += used;
913 if (used != len)
914 return;
915
916 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
917 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
918 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
919 else
920 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
921 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
922
923 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
924 transport->tcp_offset = 0;
925
926 /* Sanity check of the record length */
927 if (unlikely(transport->tcp_reclen < 4)) {
928 dprintk("RPC: invalid TCP record fragment length\n");
929 xprt_force_disconnect(xprt);
930 return;
931 }
932 dprintk("RPC: reading TCP record fragment of length %d\n",
933 transport->tcp_reclen);
934 }
935
936 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
937 {
938 if (transport->tcp_offset == transport->tcp_reclen) {
939 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
940 transport->tcp_offset = 0;
941 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
942 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
943 transport->tcp_flags |= TCP_RCV_COPY_XID;
944 transport->tcp_copied = 0;
945 }
946 }
947 }
948
949 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
950 {
951 size_t len, used;
952 char *p;
953
954 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
955 dprintk("RPC: reading XID (%Zu bytes)\n", len);
956 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
957 used = xdr_skb_read_bits(desc, p, len);
958 transport->tcp_offset += used;
959 if (used != len)
960 return;
961 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
962 transport->tcp_flags |= TCP_RCV_COPY_DATA;
963 transport->tcp_copied = 4;
964 dprintk("RPC: reading reply for XID %08x\n",
965 ntohl(transport->tcp_xid));
966 xs_tcp_check_fraghdr(transport);
967 }
968
969 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
970 {
971 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
972 struct rpc_rqst *req;
973 struct xdr_buf *rcvbuf;
974 size_t len;
975 ssize_t r;
976
977 /* Find and lock the request corresponding to this xid */
978 spin_lock(&xprt->transport_lock);
979 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
980 if (!req) {
981 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
982 dprintk("RPC: XID %08x request not found!\n",
983 ntohl(transport->tcp_xid));
984 spin_unlock(&xprt->transport_lock);
985 return;
986 }
987
988 rcvbuf = &req->rq_private_buf;
989 len = desc->count;
990 if (len > transport->tcp_reclen - transport->tcp_offset) {
991 struct xdr_skb_reader my_desc;
992
993 len = transport->tcp_reclen - transport->tcp_offset;
994 memcpy(&my_desc, desc, sizeof(my_desc));
995 my_desc.count = len;
996 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
997 &my_desc, xdr_skb_read_bits);
998 desc->count -= r;
999 desc->offset += r;
1000 } else
1001 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1002 desc, xdr_skb_read_bits);
1003
1004 if (r > 0) {
1005 transport->tcp_copied += r;
1006 transport->tcp_offset += r;
1007 }
1008 if (r != len) {
1009 /* Error when copying to the receive buffer,
1010 * usually because we weren't able to allocate
1011 * additional buffer pages. All we can do now
1012 * is turn off TCP_RCV_COPY_DATA, so the request
1013 * will not receive any additional updates,
1014 * and time out.
1015 * Any remaining data from this record will
1016 * be discarded.
1017 */
1018 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1019 dprintk("RPC: XID %08x truncated request\n",
1020 ntohl(transport->tcp_xid));
1021 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1022 "tcp_offset = %u, tcp_reclen = %u\n",
1023 xprt, transport->tcp_copied,
1024 transport->tcp_offset, transport->tcp_reclen);
1025 goto out;
1026 }
1027
1028 dprintk("RPC: XID %08x read %Zd bytes\n",
1029 ntohl(transport->tcp_xid), r);
1030 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1031 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1032 transport->tcp_offset, transport->tcp_reclen);
1033
1034 if (transport->tcp_copied == req->rq_private_buf.buflen)
1035 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1036 else if (transport->tcp_offset == transport->tcp_reclen) {
1037 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1038 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1039 }
1040
1041 out:
1042 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1043 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1044 spin_unlock(&xprt->transport_lock);
1045 xs_tcp_check_fraghdr(transport);
1046 }
1047
1048 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1049 {
1050 size_t len;
1051
1052 len = transport->tcp_reclen - transport->tcp_offset;
1053 if (len > desc->count)
1054 len = desc->count;
1055 desc->count -= len;
1056 desc->offset += len;
1057 transport->tcp_offset += len;
1058 dprintk("RPC: discarded %Zu bytes\n", len);
1059 xs_tcp_check_fraghdr(transport);
1060 }
1061
1062 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1063 {
1064 struct rpc_xprt *xprt = rd_desc->arg.data;
1065 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1066 struct xdr_skb_reader desc = {
1067 .skb = skb,
1068 .offset = offset,
1069 .count = len,
1070 };
1071
1072 dprintk("RPC: xs_tcp_data_recv started\n");
1073 do {
1074 /* Read in a new fragment marker if necessary */
1075 /* Can we ever really expect to get completely empty fragments? */
1076 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1077 xs_tcp_read_fraghdr(xprt, &desc);
1078 continue;
1079 }
1080 /* Read in the xid if necessary */
1081 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1082 xs_tcp_read_xid(transport, &desc);
1083 continue;
1084 }
1085 /* Read in the request data */
1086 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1087 xs_tcp_read_request(xprt, &desc);
1088 continue;
1089 }
1090 /* Skip over any trailing bytes on short reads */
1091 xs_tcp_read_discard(transport, &desc);
1092 } while (desc.count);
1093 dprintk("RPC: xs_tcp_data_recv done\n");
1094 return len - desc.count;
1095 }
1096
1097 /**
1098 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1099 * @sk: socket with data to read
1100 * @bytes: how much data to read
1101 *
1102 */
1103 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1104 {
1105 struct rpc_xprt *xprt;
1106 read_descriptor_t rd_desc;
1107 int read;
1108
1109 dprintk("RPC: xs_tcp_data_ready...\n");
1110
1111 read_lock(&sk->sk_callback_lock);
1112 if (!(xprt = xprt_from_sock(sk)))
1113 goto out;
1114 if (xprt->shutdown)
1115 goto out;
1116
1117 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1118 rd_desc.arg.data = xprt;
1119 do {
1120 rd_desc.count = 65536;
1121 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1122 } while (read > 0);
1123 out:
1124 read_unlock(&sk->sk_callback_lock);
1125 }
1126
1127 /**
1128 * xs_tcp_state_change - callback to handle TCP socket state changes
1129 * @sk: socket whose state has changed
1130 *
1131 */
1132 static void xs_tcp_state_change(struct sock *sk)
1133 {
1134 struct rpc_xprt *xprt;
1135
1136 read_lock(&sk->sk_callback_lock);
1137 if (!(xprt = xprt_from_sock(sk)))
1138 goto out;
1139 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1140 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1141 sk->sk_state, xprt_connected(xprt),
1142 sock_flag(sk, SOCK_DEAD),
1143 sock_flag(sk, SOCK_ZAPPED));
1144
1145 switch (sk->sk_state) {
1146 case TCP_ESTABLISHED:
1147 spin_lock_bh(&xprt->transport_lock);
1148 if (!xprt_test_and_set_connected(xprt)) {
1149 struct sock_xprt *transport = container_of(xprt,
1150 struct sock_xprt, xprt);
1151
1152 /* Reset TCP record info */
1153 transport->tcp_offset = 0;
1154 transport->tcp_reclen = 0;
1155 transport->tcp_copied = 0;
1156 transport->tcp_flags =
1157 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1158
1159 xprt_wake_pending_tasks(xprt, 0);
1160 }
1161 spin_unlock_bh(&xprt->transport_lock);
1162 break;
1163 case TCP_FIN_WAIT1:
1164 /* The client initiated a shutdown of the socket */
1165 xprt->connect_cookie++;
1166 xprt->reestablish_timeout = 0;
1167 set_bit(XPRT_CLOSING, &xprt->state);
1168 smp_mb__before_clear_bit();
1169 clear_bit(XPRT_CONNECTED, &xprt->state);
1170 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1171 smp_mb__after_clear_bit();
1172 break;
1173 case TCP_CLOSE_WAIT:
1174 /* The server initiated a shutdown of the socket */
1175 set_bit(XPRT_CLOSING, &xprt->state);
1176 xprt_force_disconnect(xprt);
1177 case TCP_SYN_SENT:
1178 xprt->connect_cookie++;
1179 case TCP_CLOSING:
1180 /*
1181 * If the server closed down the connection, make sure that
1182 * we back off before reconnecting
1183 */
1184 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1185 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1186 break;
1187 case TCP_LAST_ACK:
1188 smp_mb__before_clear_bit();
1189 clear_bit(XPRT_CONNECTED, &xprt->state);
1190 smp_mb__after_clear_bit();
1191 break;
1192 case TCP_CLOSE:
1193 smp_mb__before_clear_bit();
1194 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1195 clear_bit(XPRT_CLOSING, &xprt->state);
1196 smp_mb__after_clear_bit();
1197 /* Mark transport as closed and wake up all pending tasks */
1198 xprt_disconnect_done(xprt);
1199 }
1200 out:
1201 read_unlock(&sk->sk_callback_lock);
1202 }
1203
1204 /**
1205 * xs_tcp_error_report - callback mainly for catching RST events
1206 * @sk: socket
1207 */
1208 static void xs_tcp_error_report(struct sock *sk)
1209 {
1210 struct rpc_xprt *xprt;
1211
1212 read_lock(&sk->sk_callback_lock);
1213 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1214 goto out;
1215 if (!(xprt = xprt_from_sock(sk)))
1216 goto out;
1217 dprintk("RPC: %s client %p...\n"
1218 "RPC: error %d\n",
1219 __func__, xprt, sk->sk_err);
1220
1221 xprt_force_disconnect(xprt);
1222 out:
1223 read_unlock(&sk->sk_callback_lock);
1224 }
1225
1226 /**
1227 * xs_udp_write_space - callback invoked when socket buffer space
1228 * becomes available
1229 * @sk: socket whose state has changed
1230 *
1231 * Called when more output buffer space is available for this socket.
1232 * We try not to wake our writers until they can make "significant"
1233 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1234 * with a bunch of small requests.
1235 */
1236 static void xs_udp_write_space(struct sock *sk)
1237 {
1238 read_lock(&sk->sk_callback_lock);
1239
1240 /* from net/core/sock.c:sock_def_write_space */
1241 if (sock_writeable(sk)) {
1242 struct socket *sock;
1243 struct rpc_xprt *xprt;
1244
1245 if (unlikely(!(sock = sk->sk_socket)))
1246 goto out;
1247 clear_bit(SOCK_NOSPACE, &sock->flags);
1248
1249 if (unlikely(!(xprt = xprt_from_sock(sk))))
1250 goto out;
1251 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1252 goto out;
1253
1254 xprt_write_space(xprt);
1255 }
1256
1257 out:
1258 read_unlock(&sk->sk_callback_lock);
1259 }
1260
1261 /**
1262 * xs_tcp_write_space - callback invoked when socket buffer space
1263 * becomes available
1264 * @sk: socket whose state has changed
1265 *
1266 * Called when more output buffer space is available for this socket.
1267 * We try not to wake our writers until they can make "significant"
1268 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1269 * with a bunch of small requests.
1270 */
1271 static void xs_tcp_write_space(struct sock *sk)
1272 {
1273 read_lock(&sk->sk_callback_lock);
1274
1275 /* from net/core/stream.c:sk_stream_write_space */
1276 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1277 struct socket *sock;
1278 struct rpc_xprt *xprt;
1279
1280 if (unlikely(!(sock = sk->sk_socket)))
1281 goto out;
1282 clear_bit(SOCK_NOSPACE, &sock->flags);
1283
1284 if (unlikely(!(xprt = xprt_from_sock(sk))))
1285 goto out;
1286 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1287 goto out;
1288
1289 xprt_write_space(xprt);
1290 }
1291
1292 out:
1293 read_unlock(&sk->sk_callback_lock);
1294 }
1295
1296 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1297 {
1298 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1299 struct sock *sk = transport->inet;
1300
1301 if (transport->rcvsize) {
1302 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1303 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1304 }
1305 if (transport->sndsize) {
1306 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1307 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1308 sk->sk_write_space(sk);
1309 }
1310 }
1311
1312 /**
1313 * xs_udp_set_buffer_size - set send and receive limits
1314 * @xprt: generic transport
1315 * @sndsize: requested size of send buffer, in bytes
1316 * @rcvsize: requested size of receive buffer, in bytes
1317 *
1318 * Set socket send and receive buffer size limits.
1319 */
1320 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1321 {
1322 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1323
1324 transport->sndsize = 0;
1325 if (sndsize)
1326 transport->sndsize = sndsize + 1024;
1327 transport->rcvsize = 0;
1328 if (rcvsize)
1329 transport->rcvsize = rcvsize + 1024;
1330
1331 xs_udp_do_set_buffer_size(xprt);
1332 }
1333
1334 /**
1335 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1336 * @task: task that timed out
1337 *
1338 * Adjust the congestion window after a retransmit timeout has occurred.
1339 */
1340 static void xs_udp_timer(struct rpc_task *task)
1341 {
1342 xprt_adjust_cwnd(task, -ETIMEDOUT);
1343 }
1344
1345 static unsigned short xs_get_random_port(void)
1346 {
1347 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1348 unsigned short rand = (unsigned short) net_random() % range;
1349 return rand + xprt_min_resvport;
1350 }
1351
1352 /**
1353 * xs_set_port - reset the port number in the remote endpoint address
1354 * @xprt: generic transport
1355 * @port: new port number
1356 *
1357 */
1358 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1359 {
1360 struct sockaddr *addr = xs_addr(xprt);
1361
1362 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1363
1364 switch (addr->sa_family) {
1365 case AF_INET:
1366 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1367 break;
1368 case AF_INET6:
1369 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1370 break;
1371 default:
1372 BUG();
1373 }
1374 }
1375
1376 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1377 {
1378 unsigned short port = transport->port;
1379
1380 if (port == 0 && transport->xprt.resvport)
1381 port = xs_get_random_port();
1382 return port;
1383 }
1384
1385 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1386 {
1387 if (transport->port != 0)
1388 transport->port = 0;
1389 if (!transport->xprt.resvport)
1390 return 0;
1391 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1392 return xprt_max_resvport;
1393 return --port;
1394 }
1395
1396 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1397 {
1398 struct sockaddr_in myaddr = {
1399 .sin_family = AF_INET,
1400 };
1401 struct sockaddr_in *sa;
1402 int err, nloop = 0;
1403 unsigned short port = xs_get_srcport(transport, sock);
1404 unsigned short last;
1405
1406 sa = (struct sockaddr_in *)&transport->addr;
1407 myaddr.sin_addr = sa->sin_addr;
1408 do {
1409 myaddr.sin_port = htons(port);
1410 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1411 sizeof(myaddr));
1412 if (port == 0)
1413 break;
1414 if (err == 0) {
1415 transport->port = port;
1416 break;
1417 }
1418 last = port;
1419 port = xs_next_srcport(transport, sock, port);
1420 if (port > last)
1421 nloop++;
1422 } while (err == -EADDRINUSE && nloop != 2);
1423 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1424 __func__, &myaddr.sin_addr,
1425 port, err ? "failed" : "ok", err);
1426 return err;
1427 }
1428
1429 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1430 {
1431 struct sockaddr_in6 myaddr = {
1432 .sin6_family = AF_INET6,
1433 };
1434 struct sockaddr_in6 *sa;
1435 int err, nloop = 0;
1436 unsigned short port = xs_get_srcport(transport, sock);
1437 unsigned short last;
1438
1439 sa = (struct sockaddr_in6 *)&transport->addr;
1440 myaddr.sin6_addr = sa->sin6_addr;
1441 do {
1442 myaddr.sin6_port = htons(port);
1443 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1444 sizeof(myaddr));
1445 if (port == 0)
1446 break;
1447 if (err == 0) {
1448 transport->port = port;
1449 break;
1450 }
1451 last = port;
1452 port = xs_next_srcport(transport, sock, port);
1453 if (port > last)
1454 nloop++;
1455 } while (err == -EADDRINUSE && nloop != 2);
1456 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1457 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1458 return err;
1459 }
1460
1461 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1462 static struct lock_class_key xs_key[2];
1463 static struct lock_class_key xs_slock_key[2];
1464
1465 static inline void xs_reclassify_socket4(struct socket *sock)
1466 {
1467 struct sock *sk = sock->sk;
1468
1469 BUG_ON(sock_owned_by_user(sk));
1470 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1471 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1472 }
1473
1474 static inline void xs_reclassify_socket6(struct socket *sock)
1475 {
1476 struct sock *sk = sock->sk;
1477
1478 BUG_ON(sock_owned_by_user(sk));
1479 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1480 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1481 }
1482 #else
1483 static inline void xs_reclassify_socket4(struct socket *sock)
1484 {
1485 }
1486
1487 static inline void xs_reclassify_socket6(struct socket *sock)
1488 {
1489 }
1490 #endif
1491
1492 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1493 {
1494 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1495
1496 if (!transport->inet) {
1497 struct sock *sk = sock->sk;
1498
1499 write_lock_bh(&sk->sk_callback_lock);
1500
1501 xs_save_old_callbacks(transport, sk);
1502
1503 sk->sk_user_data = xprt;
1504 sk->sk_data_ready = xs_udp_data_ready;
1505 sk->sk_write_space = xs_udp_write_space;
1506 sk->sk_no_check = UDP_CSUM_NORCV;
1507 sk->sk_allocation = GFP_ATOMIC;
1508
1509 xprt_set_connected(xprt);
1510
1511 /* Reset to new socket */
1512 transport->sock = sock;
1513 transport->inet = sk;
1514
1515 write_unlock_bh(&sk->sk_callback_lock);
1516 }
1517 xs_udp_do_set_buffer_size(xprt);
1518 }
1519
1520 /**
1521 * xs_udp_connect_worker4 - set up a UDP socket
1522 * @work: RPC transport to connect
1523 *
1524 * Invoked by a work queue tasklet.
1525 */
1526 static void xs_udp_connect_worker4(struct work_struct *work)
1527 {
1528 struct sock_xprt *transport =
1529 container_of(work, struct sock_xprt, connect_worker.work);
1530 struct rpc_xprt *xprt = &transport->xprt;
1531 struct socket *sock = transport->sock;
1532 int err, status = -EIO;
1533
1534 if (xprt->shutdown || !xprt_bound(xprt))
1535 goto out;
1536
1537 /* Start by resetting any existing state */
1538 xs_close(xprt);
1539
1540 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1541 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1542 goto out;
1543 }
1544 xs_reclassify_socket4(sock);
1545
1546 if (xs_bind4(transport, sock)) {
1547 sock_release(sock);
1548 goto out;
1549 }
1550
1551 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1552 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1553
1554 xs_udp_finish_connecting(xprt, sock);
1555 status = 0;
1556 out:
1557 xprt_wake_pending_tasks(xprt, status);
1558 xprt_clear_connecting(xprt);
1559 }
1560
1561 /**
1562 * xs_udp_connect_worker6 - set up a UDP socket
1563 * @work: RPC transport to connect
1564 *
1565 * Invoked by a work queue tasklet.
1566 */
1567 static void xs_udp_connect_worker6(struct work_struct *work)
1568 {
1569 struct sock_xprt *transport =
1570 container_of(work, struct sock_xprt, connect_worker.work);
1571 struct rpc_xprt *xprt = &transport->xprt;
1572 struct socket *sock = transport->sock;
1573 int err, status = -EIO;
1574
1575 if (xprt->shutdown || !xprt_bound(xprt))
1576 goto out;
1577
1578 /* Start by resetting any existing state */
1579 xs_close(xprt);
1580
1581 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1582 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1583 goto out;
1584 }
1585 xs_reclassify_socket6(sock);
1586
1587 if (xs_bind6(transport, sock) < 0) {
1588 sock_release(sock);
1589 goto out;
1590 }
1591
1592 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1593 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1594
1595 xs_udp_finish_connecting(xprt, sock);
1596 status = 0;
1597 out:
1598 xprt_wake_pending_tasks(xprt, status);
1599 xprt_clear_connecting(xprt);
1600 }
1601
1602 /*
1603 * We need to preserve the port number so the reply cache on the server can
1604 * find our cached RPC replies when we get around to reconnecting.
1605 */
1606 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1607 {
1608 int result;
1609 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1610 struct sockaddr any;
1611
1612 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1613
1614 /*
1615 * Disconnect the transport socket by doing a connect operation
1616 * with AF_UNSPEC. This should return immediately...
1617 */
1618 memset(&any, 0, sizeof(any));
1619 any.sa_family = AF_UNSPEC;
1620 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1621 if (result)
1622 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1623 result);
1624 }
1625
1626 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1627 {
1628 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1629
1630 if (!transport->inet) {
1631 struct sock *sk = sock->sk;
1632
1633 write_lock_bh(&sk->sk_callback_lock);
1634
1635 xs_save_old_callbacks(transport, sk);
1636
1637 sk->sk_user_data = xprt;
1638 sk->sk_data_ready = xs_tcp_data_ready;
1639 sk->sk_state_change = xs_tcp_state_change;
1640 sk->sk_write_space = xs_tcp_write_space;
1641 sk->sk_error_report = xs_tcp_error_report;
1642 sk->sk_allocation = GFP_ATOMIC;
1643
1644 /* socket options */
1645 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1646 sock_reset_flag(sk, SOCK_LINGER);
1647 tcp_sk(sk)->linger2 = 0;
1648 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1649
1650 xprt_clear_connected(xprt);
1651
1652 /* Reset to new socket */
1653 transport->sock = sock;
1654 transport->inet = sk;
1655
1656 write_unlock_bh(&sk->sk_callback_lock);
1657 }
1658
1659 /* Tell the socket layer to start connecting... */
1660 xprt->stat.connect_count++;
1661 xprt->stat.connect_start = jiffies;
1662 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1663 }
1664
1665 /**
1666 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1667 * @work: RPC transport to connect
1668 *
1669 * Invoked by a work queue tasklet.
1670 */
1671 static void xs_tcp_connect_worker4(struct work_struct *work)
1672 {
1673 struct sock_xprt *transport =
1674 container_of(work, struct sock_xprt, connect_worker.work);
1675 struct rpc_xprt *xprt = &transport->xprt;
1676 struct socket *sock = transport->sock;
1677 int err, status = -EIO;
1678
1679 if (xprt->shutdown || !xprt_bound(xprt))
1680 goto out;
1681
1682 if (!sock) {
1683 /* start from scratch */
1684 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1685 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1686 goto out;
1687 }
1688 xs_reclassify_socket4(sock);
1689
1690 if (xs_bind4(transport, sock) < 0) {
1691 sock_release(sock);
1692 goto out;
1693 }
1694 } else
1695 /* "close" the socket, preserving the local port */
1696 xs_tcp_reuse_connection(xprt);
1697
1698 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1699 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1700
1701 status = xs_tcp_finish_connecting(xprt, sock);
1702 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1703 xprt, -status, xprt_connected(xprt),
1704 sock->sk->sk_state);
1705 if (status < 0) {
1706 switch (status) {
1707 case -EINPROGRESS:
1708 case -EALREADY:
1709 goto out_clear;
1710 case -ECONNREFUSED:
1711 case -ECONNRESET:
1712 /* retry with existing socket, after a delay */
1713 break;
1714 default:
1715 /* get rid of existing socket, and retry */
1716 xs_tcp_shutdown(xprt);
1717 }
1718 }
1719 out:
1720 xprt_wake_pending_tasks(xprt, status);
1721 out_clear:
1722 xprt_clear_connecting(xprt);
1723 }
1724
1725 /**
1726 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1727 * @work: RPC transport to connect
1728 *
1729 * Invoked by a work queue tasklet.
1730 */
1731 static void xs_tcp_connect_worker6(struct work_struct *work)
1732 {
1733 struct sock_xprt *transport =
1734 container_of(work, struct sock_xprt, connect_worker.work);
1735 struct rpc_xprt *xprt = &transport->xprt;
1736 struct socket *sock = transport->sock;
1737 int err, status = -EIO;
1738
1739 if (xprt->shutdown || !xprt_bound(xprt))
1740 goto out;
1741
1742 if (!sock) {
1743 /* start from scratch */
1744 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1745 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1746 goto out;
1747 }
1748 xs_reclassify_socket6(sock);
1749
1750 if (xs_bind6(transport, sock) < 0) {
1751 sock_release(sock);
1752 goto out;
1753 }
1754 } else
1755 /* "close" the socket, preserving the local port */
1756 xs_tcp_reuse_connection(xprt);
1757
1758 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1759 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1760
1761 status = xs_tcp_finish_connecting(xprt, sock);
1762 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1763 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1764 if (status < 0) {
1765 switch (status) {
1766 case -EINPROGRESS:
1767 case -EALREADY:
1768 goto out_clear;
1769 case -ECONNREFUSED:
1770 case -ECONNRESET:
1771 /* retry with existing socket, after a delay */
1772 break;
1773 default:
1774 /* get rid of existing socket, and retry */
1775 xs_tcp_shutdown(xprt);
1776 }
1777 }
1778 out:
1779 xprt_wake_pending_tasks(xprt, status);
1780 out_clear:
1781 xprt_clear_connecting(xprt);
1782 }
1783
1784 /**
1785 * xs_connect - connect a socket to a remote endpoint
1786 * @task: address of RPC task that manages state of connect request
1787 *
1788 * TCP: If the remote end dropped the connection, delay reconnecting.
1789 *
1790 * UDP socket connects are synchronous, but we use a work queue anyway
1791 * to guarantee that even unprivileged user processes can set up a
1792 * socket on a privileged port.
1793 *
1794 * If a UDP socket connect fails, the delay behavior here prevents
1795 * retry floods (hard mounts).
1796 */
1797 static void xs_connect(struct rpc_task *task)
1798 {
1799 struct rpc_xprt *xprt = task->tk_xprt;
1800 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1801
1802 if (xprt_test_and_set_connecting(xprt))
1803 return;
1804
1805 if (transport->sock != NULL) {
1806 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1807 "seconds\n",
1808 xprt, xprt->reestablish_timeout / HZ);
1809 queue_delayed_work(rpciod_workqueue,
1810 &transport->connect_worker,
1811 xprt->reestablish_timeout);
1812 xprt->reestablish_timeout <<= 1;
1813 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1814 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1815 } else {
1816 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1817 queue_delayed_work(rpciod_workqueue,
1818 &transport->connect_worker, 0);
1819 }
1820 }
1821
1822 static void xs_tcp_connect(struct rpc_task *task)
1823 {
1824 struct rpc_xprt *xprt = task->tk_xprt;
1825
1826 /* Initiate graceful shutdown of the socket if not already done */
1827 if (test_bit(XPRT_CONNECTED, &xprt->state))
1828 xs_tcp_shutdown(xprt);
1829 /* Exit if we need to wait for socket shutdown to complete */
1830 if (test_bit(XPRT_CLOSING, &xprt->state))
1831 return;
1832 xs_connect(task);
1833 }
1834
1835 /**
1836 * xs_udp_print_stats - display UDP socket-specifc stats
1837 * @xprt: rpc_xprt struct containing statistics
1838 * @seq: output file
1839 *
1840 */
1841 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1842 {
1843 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1844
1845 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1846 transport->port,
1847 xprt->stat.bind_count,
1848 xprt->stat.sends,
1849 xprt->stat.recvs,
1850 xprt->stat.bad_xids,
1851 xprt->stat.req_u,
1852 xprt->stat.bklog_u);
1853 }
1854
1855 /**
1856 * xs_tcp_print_stats - display TCP socket-specifc stats
1857 * @xprt: rpc_xprt struct containing statistics
1858 * @seq: output file
1859 *
1860 */
1861 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1862 {
1863 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1864 long idle_time = 0;
1865
1866 if (xprt_connected(xprt))
1867 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1868
1869 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1870 transport->port,
1871 xprt->stat.bind_count,
1872 xprt->stat.connect_count,
1873 xprt->stat.connect_time,
1874 idle_time,
1875 xprt->stat.sends,
1876 xprt->stat.recvs,
1877 xprt->stat.bad_xids,
1878 xprt->stat.req_u,
1879 xprt->stat.bklog_u);
1880 }
1881
1882 static struct rpc_xprt_ops xs_udp_ops = {
1883 .set_buffer_size = xs_udp_set_buffer_size,
1884 .reserve_xprt = xprt_reserve_xprt_cong,
1885 .release_xprt = xprt_release_xprt_cong,
1886 .rpcbind = rpcb_getport_async,
1887 .set_port = xs_set_port,
1888 .connect = xs_connect,
1889 .buf_alloc = rpc_malloc,
1890 .buf_free = rpc_free,
1891 .send_request = xs_udp_send_request,
1892 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1893 .timer = xs_udp_timer,
1894 .release_request = xprt_release_rqst_cong,
1895 .close = xs_close,
1896 .destroy = xs_destroy,
1897 .print_stats = xs_udp_print_stats,
1898 };
1899
1900 static struct rpc_xprt_ops xs_tcp_ops = {
1901 .reserve_xprt = xprt_reserve_xprt,
1902 .release_xprt = xs_tcp_release_xprt,
1903 .rpcbind = rpcb_getport_async,
1904 .set_port = xs_set_port,
1905 .connect = xs_tcp_connect,
1906 .buf_alloc = rpc_malloc,
1907 .buf_free = rpc_free,
1908 .send_request = xs_tcp_send_request,
1909 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1910 .close = xs_tcp_shutdown,
1911 .destroy = xs_destroy,
1912 .print_stats = xs_tcp_print_stats,
1913 };
1914
1915 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1916 unsigned int slot_table_size)
1917 {
1918 struct rpc_xprt *xprt;
1919 struct sock_xprt *new;
1920
1921 if (args->addrlen > sizeof(xprt->addr)) {
1922 dprintk("RPC: xs_setup_xprt: address too large\n");
1923 return ERR_PTR(-EBADF);
1924 }
1925
1926 new = kzalloc(sizeof(*new), GFP_KERNEL);
1927 if (new == NULL) {
1928 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1929 "rpc_xprt\n");
1930 return ERR_PTR(-ENOMEM);
1931 }
1932 xprt = &new->xprt;
1933
1934 xprt->max_reqs = slot_table_size;
1935 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1936 if (xprt->slot == NULL) {
1937 kfree(xprt);
1938 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1939 "table\n");
1940 return ERR_PTR(-ENOMEM);
1941 }
1942
1943 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1944 xprt->addrlen = args->addrlen;
1945 if (args->srcaddr)
1946 memcpy(&new->addr, args->srcaddr, args->addrlen);
1947
1948 return xprt;
1949 }
1950
1951 static const struct rpc_timeout xs_udp_default_timeout = {
1952 .to_initval = 5 * HZ,
1953 .to_maxval = 30 * HZ,
1954 .to_increment = 5 * HZ,
1955 .to_retries = 5,
1956 };
1957
1958 /**
1959 * xs_setup_udp - Set up transport to use a UDP socket
1960 * @args: rpc transport creation arguments
1961 *
1962 */
1963 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1964 {
1965 struct sockaddr *addr = args->dstaddr;
1966 struct rpc_xprt *xprt;
1967 struct sock_xprt *transport;
1968
1969 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1970 if (IS_ERR(xprt))
1971 return xprt;
1972 transport = container_of(xprt, struct sock_xprt, xprt);
1973
1974 xprt->prot = IPPROTO_UDP;
1975 xprt->tsh_size = 0;
1976 /* XXX: header size can vary due to auth type, IPv6, etc. */
1977 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1978
1979 xprt->bind_timeout = XS_BIND_TO;
1980 xprt->connect_timeout = XS_UDP_CONN_TO;
1981 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1982 xprt->idle_timeout = XS_IDLE_DISC_TO;
1983
1984 xprt->ops = &xs_udp_ops;
1985
1986 xprt->timeout = &xs_udp_default_timeout;
1987
1988 switch (addr->sa_family) {
1989 case AF_INET:
1990 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1991 xprt_set_bound(xprt);
1992
1993 INIT_DELAYED_WORK(&transport->connect_worker,
1994 xs_udp_connect_worker4);
1995 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1996 break;
1997 case AF_INET6:
1998 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1999 xprt_set_bound(xprt);
2000
2001 INIT_DELAYED_WORK(&transport->connect_worker,
2002 xs_udp_connect_worker6);
2003 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2004 break;
2005 default:
2006 kfree(xprt);
2007 return ERR_PTR(-EAFNOSUPPORT);
2008 }
2009
2010 dprintk("RPC: set up transport to address %s\n",
2011 xprt->address_strings[RPC_DISPLAY_ALL]);
2012
2013 if (try_module_get(THIS_MODULE))
2014 return xprt;
2015
2016 kfree(xprt->slot);
2017 kfree(xprt);
2018 return ERR_PTR(-EINVAL);
2019 }
2020
2021 static const struct rpc_timeout xs_tcp_default_timeout = {
2022 .to_initval = 60 * HZ,
2023 .to_maxval = 60 * HZ,
2024 .to_retries = 2,
2025 };
2026
2027 /**
2028 * xs_setup_tcp - Set up transport to use a TCP socket
2029 * @args: rpc transport creation arguments
2030 *
2031 */
2032 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2033 {
2034 struct sockaddr *addr = args->dstaddr;
2035 struct rpc_xprt *xprt;
2036 struct sock_xprt *transport;
2037
2038 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2039 if (IS_ERR(xprt))
2040 return xprt;
2041 transport = container_of(xprt, struct sock_xprt, xprt);
2042
2043 xprt->prot = IPPROTO_TCP;
2044 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2045 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2046
2047 xprt->bind_timeout = XS_BIND_TO;
2048 xprt->connect_timeout = XS_TCP_CONN_TO;
2049 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2050 xprt->idle_timeout = XS_IDLE_DISC_TO;
2051
2052 xprt->ops = &xs_tcp_ops;
2053 xprt->timeout = &xs_tcp_default_timeout;
2054
2055 switch (addr->sa_family) {
2056 case AF_INET:
2057 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2058 xprt_set_bound(xprt);
2059
2060 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2061 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2062 break;
2063 case AF_INET6:
2064 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2065 xprt_set_bound(xprt);
2066
2067 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2068 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2069 break;
2070 default:
2071 kfree(xprt);
2072 return ERR_PTR(-EAFNOSUPPORT);
2073 }
2074
2075 dprintk("RPC: set up transport to address %s\n",
2076 xprt->address_strings[RPC_DISPLAY_ALL]);
2077
2078 if (try_module_get(THIS_MODULE))
2079 return xprt;
2080
2081 kfree(xprt->slot);
2082 kfree(xprt);
2083 return ERR_PTR(-EINVAL);
2084 }
2085
2086 static struct xprt_class xs_udp_transport = {
2087 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2088 .name = "udp",
2089 .owner = THIS_MODULE,
2090 .ident = IPPROTO_UDP,
2091 .setup = xs_setup_udp,
2092 };
2093
2094 static struct xprt_class xs_tcp_transport = {
2095 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2096 .name = "tcp",
2097 .owner = THIS_MODULE,
2098 .ident = IPPROTO_TCP,
2099 .setup = xs_setup_tcp,
2100 };
2101
2102 /**
2103 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2104 *
2105 */
2106 int init_socket_xprt(void)
2107 {
2108 #ifdef RPC_DEBUG
2109 if (!sunrpc_table_header)
2110 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2111 #endif
2112
2113 xprt_register_transport(&xs_udp_transport);
2114 xprt_register_transport(&xs_tcp_transport);
2115
2116 return 0;
2117 }
2118
2119 /**
2120 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2121 *
2122 */
2123 void cleanup_socket_xprt(void)
2124 {
2125 #ifdef RPC_DEBUG
2126 if (sunrpc_table_header) {
2127 unregister_sysctl_table(sunrpc_table_header);
2128 sunrpc_table_header = NULL;
2129 }
2130 #endif
2131
2132 xprt_unregister_transport(&xs_udp_transport);
2133 xprt_unregister_transport(&xs_tcp_transport);
2134 }
Linux kernel - Deliverables
This page took 0.130592 seconds and 6 git commands to generate.