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[PATCH] fix efs_lookup()
[linux-2.6/mini2440.git] / net / sunrpc / xprtsock.c
blob4486c59c3aca87d6102a372255246a326b9efdc6
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 * 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 };
253
254 /*
255 * TCP receive state flags
256 */
257 #define TCP_RCV_LAST_FRAG (1UL << 0)
258 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
259 #define TCP_RCV_COPY_XID (1UL << 2)
260 #define TCP_RCV_COPY_DATA (1UL << 3)
261
262 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
263 {
264 return (struct sockaddr *) &xprt->addr;
265 }
266
267 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
268 {
269 return (struct sockaddr_in *) &xprt->addr;
270 }
271
272 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
273 {
274 return (struct sockaddr_in6 *) &xprt->addr;
275 }
276
277 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
278 const char *protocol,
279 const char *netid)
280 {
281 struct sockaddr_in *addr = xs_addr_in(xprt);
282 char *buf;
283
284 buf = kzalloc(20, GFP_KERNEL);
285 if (buf) {
286 snprintf(buf, 20, NIPQUAD_FMT,
287 NIPQUAD(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="NIPQUAD_FMT" port=%u proto=%s",
303 NIPQUAD(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, NIPQUAD_FMT".%u.%u",
326 NIPQUAD(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, NIP6_FMT,
345 NIP6(addr->sin6_addr));
346 }
347 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
348
349 buf = kzalloc(8, GFP_KERNEL);
350 if (buf) {
351 snprintf(buf, 8, "%u",
352 ntohs(addr->sin6_port));
353 }
354 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
355
356 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
357
358 buf = kzalloc(64, GFP_KERNEL);
359 if (buf) {
360 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
361 NIP6(addr->sin6_addr),
362 ntohs(addr->sin6_port),
363 protocol);
364 }
365 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
366
367 buf = kzalloc(36, GFP_KERNEL);
368 if (buf) {
369 snprintf(buf, 36, NIP6_SEQFMT,
370 NIP6(addr->sin6_addr));
371 }
372 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
373
374 buf = kzalloc(8, GFP_KERNEL);
375 if (buf) {
376 snprintf(buf, 8, "%4hx",
377 ntohs(addr->sin6_port));
378 }
379 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
380
381 buf = kzalloc(50, GFP_KERNEL);
382 if (buf) {
383 snprintf(buf, 50, NIP6_FMT".%u.%u",
384 NIP6(addr->sin6_addr),
385 ntohs(addr->sin6_port) >> 8,
386 ntohs(addr->sin6_port) & 0xff);
387 }
388 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
389
390 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
391 }
392
393 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
394 {
395 unsigned int i;
396
397 for (i = 0; i < RPC_DISPLAY_MAX; i++)
398 switch (i) {
399 case RPC_DISPLAY_PROTO:
400 case RPC_DISPLAY_NETID:
401 continue;
402 default:
403 kfree(xprt->address_strings[i]);
404 }
405 }
406
407 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
408
409 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
410 {
411 struct msghdr msg = {
412 .msg_name = addr,
413 .msg_namelen = addrlen,
414 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
415 };
416 struct kvec iov = {
417 .iov_base = vec->iov_base + base,
418 .iov_len = vec->iov_len - base,
419 };
420
421 if (iov.iov_len != 0)
422 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
423 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
424 }
425
426 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
427 {
428 struct page **ppage;
429 unsigned int remainder;
430 int err, sent = 0;
431
432 remainder = xdr->page_len - base;
433 base += xdr->page_base;
434 ppage = xdr->pages + (base >> PAGE_SHIFT);
435 base &= ~PAGE_MASK;
436 for(;;) {
437 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
438 int flags = XS_SENDMSG_FLAGS;
439
440 remainder -= len;
441 if (remainder != 0 || more)
442 flags |= MSG_MORE;
443 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
444 if (remainder == 0 || err != len)
445 break;
446 sent += err;
447 ppage++;
448 base = 0;
449 }
450 if (sent == 0)
451 return err;
452 if (err > 0)
453 sent += err;
454 return sent;
455 }
456
457 /**
458 * xs_sendpages - write pages directly to a socket
459 * @sock: socket to send on
460 * @addr: UDP only -- address of destination
461 * @addrlen: UDP only -- length of destination address
462 * @xdr: buffer containing this request
463 * @base: starting position in the buffer
464 *
465 */
466 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
467 {
468 unsigned int remainder = xdr->len - base;
469 int err, sent = 0;
470
471 if (unlikely(!sock))
472 return -ENOTCONN;
473
474 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
475 if (base != 0) {
476 addr = NULL;
477 addrlen = 0;
478 }
479
480 if (base < xdr->head[0].iov_len || addr != NULL) {
481 unsigned int len = xdr->head[0].iov_len - base;
482 remainder -= len;
483 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
484 if (remainder == 0 || err != len)
485 goto out;
486 sent += err;
487 base = 0;
488 } else
489 base -= xdr->head[0].iov_len;
490
491 if (base < xdr->page_len) {
492 unsigned int len = xdr->page_len - base;
493 remainder -= len;
494 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
495 if (remainder == 0 || err != len)
496 goto out;
497 sent += err;
498 base = 0;
499 } else
500 base -= xdr->page_len;
501
502 if (base >= xdr->tail[0].iov_len)
503 return sent;
504 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
505 out:
506 if (sent == 0)
507 return err;
508 if (err > 0)
509 sent += err;
510 return sent;
511 }
512
513 static void xs_nospace_callback(struct rpc_task *task)
514 {
515 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
516
517 transport->inet->sk_write_pending--;
518 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
519 }
520
521 /**
522 * xs_nospace - place task on wait queue if transmit was incomplete
523 * @task: task to put to sleep
524 *
525 */
526 static void xs_nospace(struct rpc_task *task)
527 {
528 struct rpc_rqst *req = task->tk_rqstp;
529 struct rpc_xprt *xprt = req->rq_xprt;
530 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
531
532 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
533 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
534 req->rq_slen);
535
536 /* Protect against races with write_space */
537 spin_lock_bh(&xprt->transport_lock);
538
539 /* Don't race with disconnect */
540 if (xprt_connected(xprt)) {
541 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
542 /*
543 * Notify TCP that we're limited by the application
544 * window size
545 */
546 set_bit(SOCK_NOSPACE, &transport->sock->flags);
547 transport->inet->sk_write_pending++;
548 /* ...and wait for more buffer space */
549 xprt_wait_for_buffer_space(task, xs_nospace_callback);
550 }
551 } else {
552 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
553 task->tk_status = -ENOTCONN;
554 }
555
556 spin_unlock_bh(&xprt->transport_lock);
557 }
558
559 /**
560 * xs_udp_send_request - write an RPC request to a UDP socket
561 * @task: address of RPC task that manages the state of an RPC request
562 *
563 * Return values:
564 * 0: The request has been sent
565 * EAGAIN: The socket was blocked, please call again later to
566 * complete the request
567 * ENOTCONN: Caller needs to invoke connect logic then call again
568 * other: Some other error occured, the request was not sent
569 */
570 static int xs_udp_send_request(struct rpc_task *task)
571 {
572 struct rpc_rqst *req = task->tk_rqstp;
573 struct rpc_xprt *xprt = req->rq_xprt;
574 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
575 struct xdr_buf *xdr = &req->rq_snd_buf;
576 int status;
577
578 xs_pktdump("packet data:",
579 req->rq_svec->iov_base,
580 req->rq_svec->iov_len);
581
582 status = xs_sendpages(transport->sock,
583 xs_addr(xprt),
584 xprt->addrlen, xdr,
585 req->rq_bytes_sent);
586
587 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
588 xdr->len - req->rq_bytes_sent, status);
589
590 if (status >= 0) {
591 task->tk_bytes_sent += status;
592 if (status >= req->rq_slen)
593 return 0;
594 /* Still some bytes left; set up for a retry later. */
595 status = -EAGAIN;
596 }
597
598 switch (status) {
599 case -EAGAIN:
600 xs_nospace(task);
601 break;
602 case -ENETUNREACH:
603 case -EPIPE:
604 case -ECONNREFUSED:
605 /* When the server has died, an ICMP port unreachable message
606 * prompts ECONNREFUSED. */
607 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
608 break;
609 default:
610 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
611 dprintk("RPC: sendmsg returned unrecognized error %d\n",
612 -status);
613 }
614
615 return status;
616 }
617
618 /**
619 * xs_tcp_shutdown - gracefully shut down a TCP socket
620 * @xprt: transport
621 *
622 * Initiates a graceful shutdown of the TCP socket by calling the
623 * equivalent of shutdown(SHUT_WR);
624 */
625 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
626 {
627 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
628 struct socket *sock = transport->sock;
629
630 if (sock != NULL)
631 kernel_sock_shutdown(sock, SHUT_WR);
632 }
633
634 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
635 {
636 u32 reclen = buf->len - sizeof(rpc_fraghdr);
637 rpc_fraghdr *base = buf->head[0].iov_base;
638 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
639 }
640
641 /**
642 * xs_tcp_send_request - write an RPC request to a TCP socket
643 * @task: address of RPC task that manages the state of an RPC request
644 *
645 * Return values:
646 * 0: The request has been sent
647 * EAGAIN: The socket was blocked, please call again later to
648 * complete the request
649 * ENOTCONN: Caller needs to invoke connect logic then call again
650 * other: Some other error occured, the request was not sent
651 *
652 * XXX: In the case of soft timeouts, should we eventually give up
653 * if sendmsg is not able to make progress?
654 */
655 static int xs_tcp_send_request(struct rpc_task *task)
656 {
657 struct rpc_rqst *req = task->tk_rqstp;
658 struct rpc_xprt *xprt = req->rq_xprt;
659 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
660 struct xdr_buf *xdr = &req->rq_snd_buf;
661 int status;
662
663 xs_encode_tcp_record_marker(&req->rq_snd_buf);
664
665 xs_pktdump("packet data:",
666 req->rq_svec->iov_base,
667 req->rq_svec->iov_len);
668
669 /* Continue transmitting the packet/record. We must be careful
670 * to cope with writespace callbacks arriving _after_ we have
671 * called sendmsg(). */
672 while (1) {
673 status = xs_sendpages(transport->sock,
674 NULL, 0, xdr, req->rq_bytes_sent);
675
676 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
677 xdr->len - req->rq_bytes_sent, status);
678
679 if (unlikely(status < 0))
680 break;
681
682 /* If we've sent the entire packet, immediately
683 * reset the count of bytes sent. */
684 req->rq_bytes_sent += status;
685 task->tk_bytes_sent += status;
686 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
687 req->rq_bytes_sent = 0;
688 return 0;
689 }
690
691 if (status != 0)
692 continue;
693 status = -EAGAIN;
694 break;
695 }
696
697 switch (status) {
698 case -EAGAIN:
699 xs_nospace(task);
700 break;
701 case -ECONNREFUSED:
702 case -ECONNRESET:
703 case -ENOTCONN:
704 case -EPIPE:
705 status = -ENOTCONN;
706 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
707 break;
708 default:
709 dprintk("RPC: sendmsg returned unrecognized error %d\n",
710 -status);
711 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
712 xs_tcp_shutdown(xprt);
713 }
714
715 return status;
716 }
717
718 /**
719 * xs_tcp_release_xprt - clean up after a tcp transmission
720 * @xprt: transport
721 * @task: rpc task
722 *
723 * This cleans up if an error causes us to abort the transmission of a request.
724 * In this case, the socket may need to be reset in order to avoid confusing
725 * the server.
726 */
727 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
728 {
729 struct rpc_rqst *req;
730
731 if (task != xprt->snd_task)
732 return;
733 if (task == NULL)
734 goto out_release;
735 req = task->tk_rqstp;
736 if (req->rq_bytes_sent == 0)
737 goto out_release;
738 if (req->rq_bytes_sent == req->rq_snd_buf.len)
739 goto out_release;
740 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
741 out_release:
742 xprt_release_xprt(xprt, task);
743 }
744
745 /**
746 * xs_close - close a socket
747 * @xprt: transport
748 *
749 * This is used when all requests are complete; ie, no DRC state remains
750 * on the server we want to save.
751 */
752 static void xs_close(struct rpc_xprt *xprt)
753 {
754 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
755 struct socket *sock = transport->sock;
756 struct sock *sk = transport->inet;
757
758 if (!sk)
759 goto clear_close_wait;
760
761 dprintk("RPC: xs_close xprt %p\n", xprt);
762
763 write_lock_bh(&sk->sk_callback_lock);
764 transport->inet = NULL;
765 transport->sock = NULL;
766
767 sk->sk_user_data = NULL;
768 sk->sk_data_ready = transport->old_data_ready;
769 sk->sk_state_change = transport->old_state_change;
770 sk->sk_write_space = transport->old_write_space;
771 write_unlock_bh(&sk->sk_callback_lock);
772
773 sk->sk_no_check = 0;
774
775 sock_release(sock);
776 clear_close_wait:
777 smp_mb__before_clear_bit();
778 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
779 clear_bit(XPRT_CLOSING, &xprt->state);
780 smp_mb__after_clear_bit();
781 xprt_disconnect_done(xprt);
782 }
783
784 /**
785 * xs_destroy - prepare to shutdown a transport
786 * @xprt: doomed transport
787 *
788 */
789 static void xs_destroy(struct rpc_xprt *xprt)
790 {
791 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
792
793 dprintk("RPC: xs_destroy xprt %p\n", xprt);
794
795 cancel_rearming_delayed_work(&transport->connect_worker);
796
797 xs_close(xprt);
798 xs_free_peer_addresses(xprt);
799 kfree(xprt->slot);
800 kfree(xprt);
801 module_put(THIS_MODULE);
802 }
803
804 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
805 {
806 return (struct rpc_xprt *) sk->sk_user_data;
807 }
808
809 /**
810 * xs_udp_data_ready - "data ready" callback for UDP sockets
811 * @sk: socket with data to read
812 * @len: how much data to read
813 *
814 */
815 static void xs_udp_data_ready(struct sock *sk, int len)
816 {
817 struct rpc_task *task;
818 struct rpc_xprt *xprt;
819 struct rpc_rqst *rovr;
820 struct sk_buff *skb;
821 int err, repsize, copied;
822 u32 _xid;
823 __be32 *xp;
824
825 read_lock(&sk->sk_callback_lock);
826 dprintk("RPC: xs_udp_data_ready...\n");
827 if (!(xprt = xprt_from_sock(sk)))
828 goto out;
829
830 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
831 goto out;
832
833 if (xprt->shutdown)
834 goto dropit;
835
836 repsize = skb->len - sizeof(struct udphdr);
837 if (repsize < 4) {
838 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
839 goto dropit;
840 }
841
842 /* Copy the XID from the skb... */
843 xp = skb_header_pointer(skb, sizeof(struct udphdr),
844 sizeof(_xid), &_xid);
845 if (xp == NULL)
846 goto dropit;
847
848 /* Look up and lock the request corresponding to the given XID */
849 spin_lock(&xprt->transport_lock);
850 rovr = xprt_lookup_rqst(xprt, *xp);
851 if (!rovr)
852 goto out_unlock;
853 task = rovr->rq_task;
854
855 if ((copied = rovr->rq_private_buf.buflen) > repsize)
856 copied = repsize;
857
858 /* Suck it into the iovec, verify checksum if not done by hw. */
859 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
860 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
861 goto out_unlock;
862 }
863
864 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
865
866 /* Something worked... */
867 dst_confirm(skb->dst);
868
869 xprt_adjust_cwnd(task, copied);
870 xprt_update_rtt(task);
871 xprt_complete_rqst(task, copied);
872
873 out_unlock:
874 spin_unlock(&xprt->transport_lock);
875 dropit:
876 skb_free_datagram(sk, skb);
877 out:
878 read_unlock(&sk->sk_callback_lock);
879 }
880
881 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
882 {
883 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
884 size_t len, used;
885 char *p;
886
887 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
888 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
889 used = xdr_skb_read_bits(desc, p, len);
890 transport->tcp_offset += used;
891 if (used != len)
892 return;
893
894 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
895 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
896 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
897 else
898 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
899 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
900
901 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
902 transport->tcp_offset = 0;
903
904 /* Sanity check of the record length */
905 if (unlikely(transport->tcp_reclen < 4)) {
906 dprintk("RPC: invalid TCP record fragment length\n");
907 xprt_force_disconnect(xprt);
908 return;
909 }
910 dprintk("RPC: reading TCP record fragment of length %d\n",
911 transport->tcp_reclen);
912 }
913
914 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
915 {
916 if (transport->tcp_offset == transport->tcp_reclen) {
917 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
918 transport->tcp_offset = 0;
919 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
920 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
921 transport->tcp_flags |= TCP_RCV_COPY_XID;
922 transport->tcp_copied = 0;
923 }
924 }
925 }
926
927 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
928 {
929 size_t len, used;
930 char *p;
931
932 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
933 dprintk("RPC: reading XID (%Zu bytes)\n", len);
934 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
935 used = xdr_skb_read_bits(desc, p, len);
936 transport->tcp_offset += used;
937 if (used != len)
938 return;
939 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
940 transport->tcp_flags |= TCP_RCV_COPY_DATA;
941 transport->tcp_copied = 4;
942 dprintk("RPC: reading reply for XID %08x\n",
943 ntohl(transport->tcp_xid));
944 xs_tcp_check_fraghdr(transport);
945 }
946
947 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
948 {
949 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
950 struct rpc_rqst *req;
951 struct xdr_buf *rcvbuf;
952 size_t len;
953 ssize_t r;
954
955 /* Find and lock the request corresponding to this xid */
956 spin_lock(&xprt->transport_lock);
957 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
958 if (!req) {
959 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
960 dprintk("RPC: XID %08x request not found!\n",
961 ntohl(transport->tcp_xid));
962 spin_unlock(&xprt->transport_lock);
963 return;
964 }
965
966 rcvbuf = &req->rq_private_buf;
967 len = desc->count;
968 if (len > transport->tcp_reclen - transport->tcp_offset) {
969 struct xdr_skb_reader my_desc;
970
971 len = transport->tcp_reclen - transport->tcp_offset;
972 memcpy(&my_desc, desc, sizeof(my_desc));
973 my_desc.count = len;
974 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
975 &my_desc, xdr_skb_read_bits);
976 desc->count -= r;
977 desc->offset += r;
978 } else
979 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
980 desc, xdr_skb_read_bits);
981
982 if (r > 0) {
983 transport->tcp_copied += r;
984 transport->tcp_offset += r;
985 }
986 if (r != len) {
987 /* Error when copying to the receive buffer,
988 * usually because we weren't able to allocate
989 * additional buffer pages. All we can do now
990 * is turn off TCP_RCV_COPY_DATA, so the request
991 * will not receive any additional updates,
992 * and time out.
993 * Any remaining data from this record will
994 * be discarded.
995 */
996 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
997 dprintk("RPC: XID %08x truncated request\n",
998 ntohl(transport->tcp_xid));
999 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1000 "tcp_offset = %u, tcp_reclen = %u\n",
1001 xprt, transport->tcp_copied,
1002 transport->tcp_offset, transport->tcp_reclen);
1003 goto out;
1004 }
1005
1006 dprintk("RPC: XID %08x read %Zd bytes\n",
1007 ntohl(transport->tcp_xid), r);
1008 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1009 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1010 transport->tcp_offset, transport->tcp_reclen);
1011
1012 if (transport->tcp_copied == req->rq_private_buf.buflen)
1013 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1014 else if (transport->tcp_offset == transport->tcp_reclen) {
1015 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1016 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1017 }
1018
1019 out:
1020 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1021 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1022 spin_unlock(&xprt->transport_lock);
1023 xs_tcp_check_fraghdr(transport);
1024 }
1025
1026 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1027 {
1028 size_t len;
1029
1030 len = transport->tcp_reclen - transport->tcp_offset;
1031 if (len > desc->count)
1032 len = desc->count;
1033 desc->count -= len;
1034 desc->offset += len;
1035 transport->tcp_offset += len;
1036 dprintk("RPC: discarded %Zu bytes\n", len);
1037 xs_tcp_check_fraghdr(transport);
1038 }
1039
1040 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1041 {
1042 struct rpc_xprt *xprt = rd_desc->arg.data;
1043 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1044 struct xdr_skb_reader desc = {
1045 .skb = skb,
1046 .offset = offset,
1047 .count = len,
1048 };
1049
1050 dprintk("RPC: xs_tcp_data_recv started\n");
1051 do {
1052 /* Read in a new fragment marker if necessary */
1053 /* Can we ever really expect to get completely empty fragments? */
1054 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1055 xs_tcp_read_fraghdr(xprt, &desc);
1056 continue;
1057 }
1058 /* Read in the xid if necessary */
1059 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1060 xs_tcp_read_xid(transport, &desc);
1061 continue;
1062 }
1063 /* Read in the request data */
1064 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1065 xs_tcp_read_request(xprt, &desc);
1066 continue;
1067 }
1068 /* Skip over any trailing bytes on short reads */
1069 xs_tcp_read_discard(transport, &desc);
1070 } while (desc.count);
1071 dprintk("RPC: xs_tcp_data_recv done\n");
1072 return len - desc.count;
1073 }
1074
1075 /**
1076 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1077 * @sk: socket with data to read
1078 * @bytes: how much data to read
1079 *
1080 */
1081 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1082 {
1083 struct rpc_xprt *xprt;
1084 read_descriptor_t rd_desc;
1085 int read;
1086
1087 dprintk("RPC: xs_tcp_data_ready...\n");
1088
1089 read_lock(&sk->sk_callback_lock);
1090 if (!(xprt = xprt_from_sock(sk)))
1091 goto out;
1092 if (xprt->shutdown)
1093 goto out;
1094
1095 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1096 rd_desc.arg.data = xprt;
1097 do {
1098 rd_desc.count = 65536;
1099 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1100 } while (read > 0);
1101 out:
1102 read_unlock(&sk->sk_callback_lock);
1103 }
1104
1105 /**
1106 * xs_tcp_state_change - callback to handle TCP socket state changes
1107 * @sk: socket whose state has changed
1108 *
1109 */
1110 static void xs_tcp_state_change(struct sock *sk)
1111 {
1112 struct rpc_xprt *xprt;
1113
1114 read_lock(&sk->sk_callback_lock);
1115 if (!(xprt = xprt_from_sock(sk)))
1116 goto out;
1117 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1118 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1119 sk->sk_state, xprt_connected(xprt),
1120 sock_flag(sk, SOCK_DEAD),
1121 sock_flag(sk, SOCK_ZAPPED));
1122
1123 switch (sk->sk_state) {
1124 case TCP_ESTABLISHED:
1125 spin_lock_bh(&xprt->transport_lock);
1126 if (!xprt_test_and_set_connected(xprt)) {
1127 struct sock_xprt *transport = container_of(xprt,
1128 struct sock_xprt, xprt);
1129
1130 /* Reset TCP record info */
1131 transport->tcp_offset = 0;
1132 transport->tcp_reclen = 0;
1133 transport->tcp_copied = 0;
1134 transport->tcp_flags =
1135 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1136
1137 xprt_wake_pending_tasks(xprt, 0);
1138 }
1139 spin_unlock_bh(&xprt->transport_lock);
1140 break;
1141 case TCP_FIN_WAIT1:
1142 /* The client initiated a shutdown of the socket */
1143 xprt->connect_cookie++;
1144 xprt->reestablish_timeout = 0;
1145 set_bit(XPRT_CLOSING, &xprt->state);
1146 smp_mb__before_clear_bit();
1147 clear_bit(XPRT_CONNECTED, &xprt->state);
1148 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1149 smp_mb__after_clear_bit();
1150 break;
1151 case TCP_CLOSE_WAIT:
1152 /* The server initiated a shutdown of the socket */
1153 set_bit(XPRT_CLOSING, &xprt->state);
1154 xprt_force_disconnect(xprt);
1155 case TCP_SYN_SENT:
1156 xprt->connect_cookie++;
1157 case TCP_CLOSING:
1158 /*
1159 * If the server closed down the connection, make sure that
1160 * we back off before reconnecting
1161 */
1162 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1163 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1164 break;
1165 case TCP_LAST_ACK:
1166 smp_mb__before_clear_bit();
1167 clear_bit(XPRT_CONNECTED, &xprt->state);
1168 smp_mb__after_clear_bit();
1169 break;
1170 case TCP_CLOSE:
1171 smp_mb__before_clear_bit();
1172 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1173 clear_bit(XPRT_CLOSING, &xprt->state);
1174 smp_mb__after_clear_bit();
1175 /* Mark transport as closed and wake up all pending tasks */
1176 xprt_disconnect_done(xprt);
1177 }
1178 out:
1179 read_unlock(&sk->sk_callback_lock);
1180 }
1181
1182 /**
1183 * xs_udp_write_space - callback invoked when socket buffer space
1184 * becomes available
1185 * @sk: socket whose state has changed
1186 *
1187 * Called when more output buffer space is available for this socket.
1188 * We try not to wake our writers until they can make "significant"
1189 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1190 * with a bunch of small requests.
1191 */
1192 static void xs_udp_write_space(struct sock *sk)
1193 {
1194 read_lock(&sk->sk_callback_lock);
1195
1196 /* from net/core/sock.c:sock_def_write_space */
1197 if (sock_writeable(sk)) {
1198 struct socket *sock;
1199 struct rpc_xprt *xprt;
1200
1201 if (unlikely(!(sock = sk->sk_socket)))
1202 goto out;
1203 clear_bit(SOCK_NOSPACE, &sock->flags);
1204
1205 if (unlikely(!(xprt = xprt_from_sock(sk))))
1206 goto out;
1207 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1208 goto out;
1209
1210 xprt_write_space(xprt);
1211 }
1212
1213 out:
1214 read_unlock(&sk->sk_callback_lock);
1215 }
1216
1217 /**
1218 * xs_tcp_write_space - callback invoked when socket buffer space
1219 * becomes available
1220 * @sk: socket whose state has changed
1221 *
1222 * Called when more output buffer space is available for this socket.
1223 * We try not to wake our writers until they can make "significant"
1224 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1225 * with a bunch of small requests.
1226 */
1227 static void xs_tcp_write_space(struct sock *sk)
1228 {
1229 read_lock(&sk->sk_callback_lock);
1230
1231 /* from net/core/stream.c:sk_stream_write_space */
1232 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1233 struct socket *sock;
1234 struct rpc_xprt *xprt;
1235
1236 if (unlikely(!(sock = sk->sk_socket)))
1237 goto out;
1238 clear_bit(SOCK_NOSPACE, &sock->flags);
1239
1240 if (unlikely(!(xprt = xprt_from_sock(sk))))
1241 goto out;
1242 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1243 goto out;
1244
1245 xprt_write_space(xprt);
1246 }
1247
1248 out:
1249 read_unlock(&sk->sk_callback_lock);
1250 }
1251
1252 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1253 {
1254 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1255 struct sock *sk = transport->inet;
1256
1257 if (transport->rcvsize) {
1258 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1259 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1260 }
1261 if (transport->sndsize) {
1262 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1263 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1264 sk->sk_write_space(sk);
1265 }
1266 }
1267
1268 /**
1269 * xs_udp_set_buffer_size - set send and receive limits
1270 * @xprt: generic transport
1271 * @sndsize: requested size of send buffer, in bytes
1272 * @rcvsize: requested size of receive buffer, in bytes
1273 *
1274 * Set socket send and receive buffer size limits.
1275 */
1276 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1277 {
1278 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1279
1280 transport->sndsize = 0;
1281 if (sndsize)
1282 transport->sndsize = sndsize + 1024;
1283 transport->rcvsize = 0;
1284 if (rcvsize)
1285 transport->rcvsize = rcvsize + 1024;
1286
1287 xs_udp_do_set_buffer_size(xprt);
1288 }
1289
1290 /**
1291 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1292 * @task: task that timed out
1293 *
1294 * Adjust the congestion window after a retransmit timeout has occurred.
1295 */
1296 static void xs_udp_timer(struct rpc_task *task)
1297 {
1298 xprt_adjust_cwnd(task, -ETIMEDOUT);
1299 }
1300
1301 static unsigned short xs_get_random_port(void)
1302 {
1303 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1304 unsigned short rand = (unsigned short) net_random() % range;
1305 return rand + xprt_min_resvport;
1306 }
1307
1308 /**
1309 * xs_set_port - reset the port number in the remote endpoint address
1310 * @xprt: generic transport
1311 * @port: new port number
1312 *
1313 */
1314 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1315 {
1316 struct sockaddr *addr = xs_addr(xprt);
1317
1318 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1319
1320 switch (addr->sa_family) {
1321 case AF_INET:
1322 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1323 break;
1324 case AF_INET6:
1325 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1326 break;
1327 default:
1328 BUG();
1329 }
1330 }
1331
1332 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1333 {
1334 unsigned short port = transport->port;
1335
1336 if (port == 0 && transport->xprt.resvport)
1337 port = xs_get_random_port();
1338 return port;
1339 }
1340
1341 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1342 {
1343 if (transport->port != 0)
1344 transport->port = 0;
1345 if (!transport->xprt.resvport)
1346 return 0;
1347 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1348 return xprt_max_resvport;
1349 return --port;
1350 }
1351
1352 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1353 {
1354 struct sockaddr_in myaddr = {
1355 .sin_family = AF_INET,
1356 };
1357 struct sockaddr_in *sa;
1358 int err, nloop = 0;
1359 unsigned short port = xs_get_srcport(transport, sock);
1360 unsigned short last;
1361
1362 sa = (struct sockaddr_in *)&transport->addr;
1363 myaddr.sin_addr = sa->sin_addr;
1364 do {
1365 myaddr.sin_port = htons(port);
1366 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1367 sizeof(myaddr));
1368 if (port == 0)
1369 break;
1370 if (err == 0) {
1371 transport->port = port;
1372 break;
1373 }
1374 last = port;
1375 port = xs_next_srcport(transport, sock, port);
1376 if (port > last)
1377 nloop++;
1378 } while (err == -EADDRINUSE && nloop != 2);
1379 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1380 __func__, NIPQUAD(myaddr.sin_addr),
1381 port, err ? "failed" : "ok", err);
1382 return err;
1383 }
1384
1385 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1386 {
1387 struct sockaddr_in6 myaddr = {
1388 .sin6_family = AF_INET6,
1389 };
1390 struct sockaddr_in6 *sa;
1391 int err, nloop = 0;
1392 unsigned short port = xs_get_srcport(transport, sock);
1393 unsigned short last;
1394
1395 sa = (struct sockaddr_in6 *)&transport->addr;
1396 myaddr.sin6_addr = sa->sin6_addr;
1397 do {
1398 myaddr.sin6_port = htons(port);
1399 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1400 sizeof(myaddr));
1401 if (port == 0)
1402 break;
1403 if (err == 0) {
1404 transport->port = port;
1405 break;
1406 }
1407 last = port;
1408 port = xs_next_srcport(transport, sock, port);
1409 if (port > last)
1410 nloop++;
1411 } while (err == -EADDRINUSE && nloop != 2);
1412 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1413 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1414 return err;
1415 }
1416
1417 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1418 static struct lock_class_key xs_key[2];
1419 static struct lock_class_key xs_slock_key[2];
1420
1421 static inline void xs_reclassify_socket4(struct socket *sock)
1422 {
1423 struct sock *sk = sock->sk;
1424
1425 BUG_ON(sock_owned_by_user(sk));
1426 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1427 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1428 }
1429
1430 static inline void xs_reclassify_socket6(struct socket *sock)
1431 {
1432 struct sock *sk = sock->sk;
1433
1434 BUG_ON(sock_owned_by_user(sk));
1435 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1436 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1437 }
1438 #else
1439 static inline void xs_reclassify_socket4(struct socket *sock)
1440 {
1441 }
1442
1443 static inline void xs_reclassify_socket6(struct socket *sock)
1444 {
1445 }
1446 #endif
1447
1448 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1449 {
1450 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452 if (!transport->inet) {
1453 struct sock *sk = sock->sk;
1454
1455 write_lock_bh(&sk->sk_callback_lock);
1456
1457 sk->sk_user_data = xprt;
1458 transport->old_data_ready = sk->sk_data_ready;
1459 transport->old_state_change = sk->sk_state_change;
1460 transport->old_write_space = sk->sk_write_space;
1461 sk->sk_data_ready = xs_udp_data_ready;
1462 sk->sk_write_space = xs_udp_write_space;
1463 sk->sk_no_check = UDP_CSUM_NORCV;
1464 sk->sk_allocation = GFP_ATOMIC;
1465
1466 xprt_set_connected(xprt);
1467
1468 /* Reset to new socket */
1469 transport->sock = sock;
1470 transport->inet = sk;
1471
1472 write_unlock_bh(&sk->sk_callback_lock);
1473 }
1474 xs_udp_do_set_buffer_size(xprt);
1475 }
1476
1477 /**
1478 * xs_udp_connect_worker4 - set up a UDP socket
1479 * @work: RPC transport to connect
1480 *
1481 * Invoked by a work queue tasklet.
1482 */
1483 static void xs_udp_connect_worker4(struct work_struct *work)
1484 {
1485 struct sock_xprt *transport =
1486 container_of(work, struct sock_xprt, connect_worker.work);
1487 struct rpc_xprt *xprt = &transport->xprt;
1488 struct socket *sock = transport->sock;
1489 int err, status = -EIO;
1490
1491 if (xprt->shutdown || !xprt_bound(xprt))
1492 goto out;
1493
1494 /* Start by resetting any existing state */
1495 xs_close(xprt);
1496
1497 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1498 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1499 goto out;
1500 }
1501 xs_reclassify_socket4(sock);
1502
1503 if (xs_bind4(transport, sock)) {
1504 sock_release(sock);
1505 goto out;
1506 }
1507
1508 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1509 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1510
1511 xs_udp_finish_connecting(xprt, sock);
1512 status = 0;
1513 out:
1514 xprt_wake_pending_tasks(xprt, status);
1515 xprt_clear_connecting(xprt);
1516 }
1517
1518 /**
1519 * xs_udp_connect_worker6 - set up a UDP socket
1520 * @work: RPC transport to connect
1521 *
1522 * Invoked by a work queue tasklet.
1523 */
1524 static void xs_udp_connect_worker6(struct work_struct *work)
1525 {
1526 struct sock_xprt *transport =
1527 container_of(work, struct sock_xprt, connect_worker.work);
1528 struct rpc_xprt *xprt = &transport->xprt;
1529 struct socket *sock = transport->sock;
1530 int err, status = -EIO;
1531
1532 if (xprt->shutdown || !xprt_bound(xprt))
1533 goto out;
1534
1535 /* Start by resetting any existing state */
1536 xs_close(xprt);
1537
1538 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1539 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1540 goto out;
1541 }
1542 xs_reclassify_socket6(sock);
1543
1544 if (xs_bind6(transport, sock) < 0) {
1545 sock_release(sock);
1546 goto out;
1547 }
1548
1549 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1550 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1551
1552 xs_udp_finish_connecting(xprt, sock);
1553 status = 0;
1554 out:
1555 xprt_wake_pending_tasks(xprt, status);
1556 xprt_clear_connecting(xprt);
1557 }
1558
1559 /*
1560 * We need to preserve the port number so the reply cache on the server can
1561 * find our cached RPC replies when we get around to reconnecting.
1562 */
1563 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1564 {
1565 int result;
1566 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1567 struct sockaddr any;
1568
1569 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1570
1571 /*
1572 * Disconnect the transport socket by doing a connect operation
1573 * with AF_UNSPEC. This should return immediately...
1574 */
1575 memset(&any, 0, sizeof(any));
1576 any.sa_family = AF_UNSPEC;
1577 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1578 if (result)
1579 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1580 result);
1581 }
1582
1583 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1584 {
1585 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1586
1587 if (!transport->inet) {
1588 struct sock *sk = sock->sk;
1589
1590 write_lock_bh(&sk->sk_callback_lock);
1591
1592 sk->sk_user_data = xprt;
1593 transport->old_data_ready = sk->sk_data_ready;
1594 transport->old_state_change = sk->sk_state_change;
1595 transport->old_write_space = sk->sk_write_space;
1596 sk->sk_data_ready = xs_tcp_data_ready;
1597 sk->sk_state_change = xs_tcp_state_change;
1598 sk->sk_write_space = xs_tcp_write_space;
1599 sk->sk_allocation = GFP_ATOMIC;
1600
1601 /* socket options */
1602 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1603 sock_reset_flag(sk, SOCK_LINGER);
1604 tcp_sk(sk)->linger2 = 0;
1605 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1606
1607 xprt_clear_connected(xprt);
1608
1609 /* Reset to new socket */
1610 transport->sock = sock;
1611 transport->inet = sk;
1612
1613 write_unlock_bh(&sk->sk_callback_lock);
1614 }
1615
1616 /* Tell the socket layer to start connecting... */
1617 xprt->stat.connect_count++;
1618 xprt->stat.connect_start = jiffies;
1619 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1620 }
1621
1622 /**
1623 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1624 * @work: RPC transport to connect
1625 *
1626 * Invoked by a work queue tasklet.
1627 */
1628 static void xs_tcp_connect_worker4(struct work_struct *work)
1629 {
1630 struct sock_xprt *transport =
1631 container_of(work, struct sock_xprt, connect_worker.work);
1632 struct rpc_xprt *xprt = &transport->xprt;
1633 struct socket *sock = transport->sock;
1634 int err, status = -EIO;
1635
1636 if (xprt->shutdown || !xprt_bound(xprt))
1637 goto out;
1638
1639 if (!sock) {
1640 /* start from scratch */
1641 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1642 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1643 goto out;
1644 }
1645 xs_reclassify_socket4(sock);
1646
1647 if (xs_bind4(transport, sock) < 0) {
1648 sock_release(sock);
1649 goto out;
1650 }
1651 } else
1652 /* "close" the socket, preserving the local port */
1653 xs_tcp_reuse_connection(xprt);
1654
1655 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1656 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1657
1658 status = xs_tcp_finish_connecting(xprt, sock);
1659 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1660 xprt, -status, xprt_connected(xprt),
1661 sock->sk->sk_state);
1662 if (status < 0) {
1663 switch (status) {
1664 case -EINPROGRESS:
1665 case -EALREADY:
1666 goto out_clear;
1667 case -ECONNREFUSED:
1668 case -ECONNRESET:
1669 /* retry with existing socket, after a delay */
1670 break;
1671 default:
1672 /* get rid of existing socket, and retry */
1673 xs_tcp_shutdown(xprt);
1674 }
1675 }
1676 out:
1677 xprt_wake_pending_tasks(xprt, status);
1678 out_clear:
1679 xprt_clear_connecting(xprt);
1680 }
1681
1682 /**
1683 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1684 * @work: RPC transport to connect
1685 *
1686 * Invoked by a work queue tasklet.
1687 */
1688 static void xs_tcp_connect_worker6(struct work_struct *work)
1689 {
1690 struct sock_xprt *transport =
1691 container_of(work, struct sock_xprt, connect_worker.work);
1692 struct rpc_xprt *xprt = &transport->xprt;
1693 struct socket *sock = transport->sock;
1694 int err, status = -EIO;
1695
1696 if (xprt->shutdown || !xprt_bound(xprt))
1697 goto out;
1698
1699 if (!sock) {
1700 /* start from scratch */
1701 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1702 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1703 goto out;
1704 }
1705 xs_reclassify_socket6(sock);
1706
1707 if (xs_bind6(transport, sock) < 0) {
1708 sock_release(sock);
1709 goto out;
1710 }
1711 } else
1712 /* "close" the socket, preserving the local port */
1713 xs_tcp_reuse_connection(xprt);
1714
1715 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1716 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1717
1718 status = xs_tcp_finish_connecting(xprt, sock);
1719 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1720 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1721 if (status < 0) {
1722 switch (status) {
1723 case -EINPROGRESS:
1724 case -EALREADY:
1725 goto out_clear;
1726 case -ECONNREFUSED:
1727 case -ECONNRESET:
1728 /* retry with existing socket, after a delay */
1729 break;
1730 default:
1731 /* get rid of existing socket, and retry */
1732 xs_tcp_shutdown(xprt);
1733 }
1734 }
1735 out:
1736 xprt_wake_pending_tasks(xprt, status);
1737 out_clear:
1738 xprt_clear_connecting(xprt);
1739 }
1740
1741 /**
1742 * xs_connect - connect a socket to a remote endpoint
1743 * @task: address of RPC task that manages state of connect request
1744 *
1745 * TCP: If the remote end dropped the connection, delay reconnecting.
1746 *
1747 * UDP socket connects are synchronous, but we use a work queue anyway
1748 * to guarantee that even unprivileged user processes can set up a
1749 * socket on a privileged port.
1750 *
1751 * If a UDP socket connect fails, the delay behavior here prevents
1752 * retry floods (hard mounts).
1753 */
1754 static void xs_connect(struct rpc_task *task)
1755 {
1756 struct rpc_xprt *xprt = task->tk_xprt;
1757 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1758
1759 if (xprt_test_and_set_connecting(xprt))
1760 return;
1761
1762 if (transport->sock != NULL) {
1763 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1764 "seconds\n",
1765 xprt, xprt->reestablish_timeout / HZ);
1766 queue_delayed_work(rpciod_workqueue,
1767 &transport->connect_worker,
1768 xprt->reestablish_timeout);
1769 xprt->reestablish_timeout <<= 1;
1770 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1771 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1772 } else {
1773 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1774 queue_delayed_work(rpciod_workqueue,
1775 &transport->connect_worker, 0);
1776 }
1777 }
1778
1779 static void xs_tcp_connect(struct rpc_task *task)
1780 {
1781 struct rpc_xprt *xprt = task->tk_xprt;
1782
1783 /* Initiate graceful shutdown of the socket if not already done */
1784 if (test_bit(XPRT_CONNECTED, &xprt->state))
1785 xs_tcp_shutdown(xprt);
1786 /* Exit if we need to wait for socket shutdown to complete */
1787 if (test_bit(XPRT_CLOSING, &xprt->state))
1788 return;
1789 xs_connect(task);
1790 }
1791
1792 /**
1793 * xs_udp_print_stats - display UDP socket-specifc stats
1794 * @xprt: rpc_xprt struct containing statistics
1795 * @seq: output file
1796 *
1797 */
1798 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1799 {
1800 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1801
1802 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1803 transport->port,
1804 xprt->stat.bind_count,
1805 xprt->stat.sends,
1806 xprt->stat.recvs,
1807 xprt->stat.bad_xids,
1808 xprt->stat.req_u,
1809 xprt->stat.bklog_u);
1810 }
1811
1812 /**
1813 * xs_tcp_print_stats - display TCP socket-specifc stats
1814 * @xprt: rpc_xprt struct containing statistics
1815 * @seq: output file
1816 *
1817 */
1818 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1819 {
1820 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1821 long idle_time = 0;
1822
1823 if (xprt_connected(xprt))
1824 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1825
1826 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1827 transport->port,
1828 xprt->stat.bind_count,
1829 xprt->stat.connect_count,
1830 xprt->stat.connect_time,
1831 idle_time,
1832 xprt->stat.sends,
1833 xprt->stat.recvs,
1834 xprt->stat.bad_xids,
1835 xprt->stat.req_u,
1836 xprt->stat.bklog_u);
1837 }
1838
1839 static struct rpc_xprt_ops xs_udp_ops = {
1840 .set_buffer_size = xs_udp_set_buffer_size,
1841 .reserve_xprt = xprt_reserve_xprt_cong,
1842 .release_xprt = xprt_release_xprt_cong,
1843 .rpcbind = rpcb_getport_async,
1844 .set_port = xs_set_port,
1845 .connect = xs_connect,
1846 .buf_alloc = rpc_malloc,
1847 .buf_free = rpc_free,
1848 .send_request = xs_udp_send_request,
1849 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1850 .timer = xs_udp_timer,
1851 .release_request = xprt_release_rqst_cong,
1852 .close = xs_close,
1853 .destroy = xs_destroy,
1854 .print_stats = xs_udp_print_stats,
1855 };
1856
1857 static struct rpc_xprt_ops xs_tcp_ops = {
1858 .reserve_xprt = xprt_reserve_xprt,
1859 .release_xprt = xs_tcp_release_xprt,
1860 .rpcbind = rpcb_getport_async,
1861 .set_port = xs_set_port,
1862 .connect = xs_tcp_connect,
1863 .buf_alloc = rpc_malloc,
1864 .buf_free = rpc_free,
1865 .send_request = xs_tcp_send_request,
1866 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1867 .close = xs_tcp_shutdown,
1868 .destroy = xs_destroy,
1869 .print_stats = xs_tcp_print_stats,
1870 };
1871
1872 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1873 unsigned int slot_table_size)
1874 {
1875 struct rpc_xprt *xprt;
1876 struct sock_xprt *new;
1877
1878 if (args->addrlen > sizeof(xprt->addr)) {
1879 dprintk("RPC: xs_setup_xprt: address too large\n");
1880 return ERR_PTR(-EBADF);
1881 }
1882
1883 new = kzalloc(sizeof(*new), GFP_KERNEL);
1884 if (new == NULL) {
1885 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1886 "rpc_xprt\n");
1887 return ERR_PTR(-ENOMEM);
1888 }
1889 xprt = &new->xprt;
1890
1891 xprt->max_reqs = slot_table_size;
1892 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1893 if (xprt->slot == NULL) {
1894 kfree(xprt);
1895 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1896 "table\n");
1897 return ERR_PTR(-ENOMEM);
1898 }
1899
1900 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1901 xprt->addrlen = args->addrlen;
1902 if (args->srcaddr)
1903 memcpy(&new->addr, args->srcaddr, args->addrlen);
1904
1905 return xprt;
1906 }
1907
1908 static const struct rpc_timeout xs_udp_default_timeout = {
1909 .to_initval = 5 * HZ,
1910 .to_maxval = 30 * HZ,
1911 .to_increment = 5 * HZ,
1912 .to_retries = 5,
1913 };
1914
1915 /**
1916 * xs_setup_udp - Set up transport to use a UDP socket
1917 * @args: rpc transport creation arguments
1918 *
1919 */
1920 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1921 {
1922 struct sockaddr *addr = args->dstaddr;
1923 struct rpc_xprt *xprt;
1924 struct sock_xprt *transport;
1925
1926 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1927 if (IS_ERR(xprt))
1928 return xprt;
1929 transport = container_of(xprt, struct sock_xprt, xprt);
1930
1931 xprt->prot = IPPROTO_UDP;
1932 xprt->tsh_size = 0;
1933 /* XXX: header size can vary due to auth type, IPv6, etc. */
1934 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1935
1936 xprt->bind_timeout = XS_BIND_TO;
1937 xprt->connect_timeout = XS_UDP_CONN_TO;
1938 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1939 xprt->idle_timeout = XS_IDLE_DISC_TO;
1940
1941 xprt->ops = &xs_udp_ops;
1942
1943 xprt->timeout = &xs_udp_default_timeout;
1944
1945 switch (addr->sa_family) {
1946 case AF_INET:
1947 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1948 xprt_set_bound(xprt);
1949
1950 INIT_DELAYED_WORK(&transport->connect_worker,
1951 xs_udp_connect_worker4);
1952 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1953 break;
1954 case AF_INET6:
1955 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1956 xprt_set_bound(xprt);
1957
1958 INIT_DELAYED_WORK(&transport->connect_worker,
1959 xs_udp_connect_worker6);
1960 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1961 break;
1962 default:
1963 kfree(xprt);
1964 return ERR_PTR(-EAFNOSUPPORT);
1965 }
1966
1967 dprintk("RPC: set up transport to address %s\n",
1968 xprt->address_strings[RPC_DISPLAY_ALL]);
1969
1970 if (try_module_get(THIS_MODULE))
1971 return xprt;
1972
1973 kfree(xprt->slot);
1974 kfree(xprt);
1975 return ERR_PTR(-EINVAL);
1976 }
1977
1978 static const struct rpc_timeout xs_tcp_default_timeout = {
1979 .to_initval = 60 * HZ,
1980 .to_maxval = 60 * HZ,
1981 .to_retries = 2,
1982 };
1983
1984 /**
1985 * xs_setup_tcp - Set up transport to use a TCP socket
1986 * @args: rpc transport creation arguments
1987 *
1988 */
1989 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1990 {
1991 struct sockaddr *addr = args->dstaddr;
1992 struct rpc_xprt *xprt;
1993 struct sock_xprt *transport;
1994
1995 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1996 if (IS_ERR(xprt))
1997 return xprt;
1998 transport = container_of(xprt, struct sock_xprt, xprt);
1999
2000 xprt->prot = IPPROTO_TCP;
2001 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2002 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2003
2004 xprt->bind_timeout = XS_BIND_TO;
2005 xprt->connect_timeout = XS_TCP_CONN_TO;
2006 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2007 xprt->idle_timeout = XS_IDLE_DISC_TO;
2008
2009 xprt->ops = &xs_tcp_ops;
2010 xprt->timeout = &xs_tcp_default_timeout;
2011
2012 switch (addr->sa_family) {
2013 case AF_INET:
2014 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2015 xprt_set_bound(xprt);
2016
2017 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2018 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2019 break;
2020 case AF_INET6:
2021 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2022 xprt_set_bound(xprt);
2023
2024 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2025 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2026 break;
2027 default:
2028 kfree(xprt);
2029 return ERR_PTR(-EAFNOSUPPORT);
2030 }
2031
2032 dprintk("RPC: set up transport to address %s\n",
2033 xprt->address_strings[RPC_DISPLAY_ALL]);
2034
2035 if (try_module_get(THIS_MODULE))
2036 return xprt;
2037
2038 kfree(xprt->slot);
2039 kfree(xprt);
2040 return ERR_PTR(-EINVAL);
2041 }
2042
2043 static struct xprt_class xs_udp_transport = {
2044 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2045 .name = "udp",
2046 .owner = THIS_MODULE,
2047 .ident = IPPROTO_UDP,
2048 .setup = xs_setup_udp,
2049 };
2050
2051 static struct xprt_class xs_tcp_transport = {
2052 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2053 .name = "tcp",
2054 .owner = THIS_MODULE,
2055 .ident = IPPROTO_TCP,
2056 .setup = xs_setup_tcp,
2057 };
2058
2059 /**
2060 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2061 *
2062 */
2063 int init_socket_xprt(void)
2064 {
2065 #ifdef RPC_DEBUG
2066 if (!sunrpc_table_header)
2067 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2068 #endif
2069
2070 xprt_register_transport(&xs_udp_transport);
2071 xprt_register_transport(&xs_tcp_transport);
2072
2073 return 0;
2074 }
2075
2076 /**
2077 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2078 *
2079 */
2080 void cleanup_socket_xprt(void)
2081 {
2082 #ifdef RPC_DEBUG
2083 if (sunrpc_table_header) {
2084 unregister_sysctl_table(sunrpc_table_header);
2085 sunrpc_table_header = NULL;
2086 }
2087 #endif
2088
2089 xprt_unregister_transport(&xs_udp_transport);
2090 xprt_unregister_transport(&xs_tcp_transport);
2091 }
Support for the Chinese Samsung S3C2440 based development boards