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pcmcia: simplify rsrc_nonstatic attributes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / xprtsock.c
blobddbe981ab516a48e42ee289bf0e8ceca88ff7a7e
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 req->rq_xtime = jiffies;
583 status = xs_sendpages(transport->sock,
584 xs_addr(xprt),
585 xprt->addrlen, xdr,
586 req->rq_bytes_sent);
587
588 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
589 xdr->len - req->rq_bytes_sent, status);
590
591 if (status >= 0) {
592 task->tk_bytes_sent += status;
593 if (status >= req->rq_slen)
594 return 0;
595 /* Still some bytes left; set up for a retry later. */
596 status = -EAGAIN;
597 }
598
599 switch (status) {
600 case -EAGAIN:
601 xs_nospace(task);
602 break;
603 case -ENETUNREACH:
604 case -EPIPE:
605 case -ECONNREFUSED:
606 /* When the server has died, an ICMP port unreachable message
607 * prompts ECONNREFUSED. */
608 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
609 break;
610 default:
611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
612 dprintk("RPC: sendmsg returned unrecognized error %d\n",
613 -status);
614 }
615
616 return status;
617 }
618
619 /**
620 * xs_tcp_shutdown - gracefully shut down a TCP socket
621 * @xprt: transport
622 *
623 * Initiates a graceful shutdown of the TCP socket by calling the
624 * equivalent of shutdown(SHUT_WR);
625 */
626 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
627 {
628 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
629 struct socket *sock = transport->sock;
630
631 if (sock != NULL)
632 kernel_sock_shutdown(sock, SHUT_WR);
633 }
634
635 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
636 {
637 u32 reclen = buf->len - sizeof(rpc_fraghdr);
638 rpc_fraghdr *base = buf->head[0].iov_base;
639 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
640 }
641
642 /**
643 * xs_tcp_send_request - write an RPC request to a TCP socket
644 * @task: address of RPC task that manages the state of an RPC request
645 *
646 * Return values:
647 * 0: The request has been sent
648 * EAGAIN: The socket was blocked, please call again later to
649 * complete the request
650 * ENOTCONN: Caller needs to invoke connect logic then call again
651 * other: Some other error occured, the request was not sent
652 *
653 * XXX: In the case of soft timeouts, should we eventually give up
654 * if sendmsg is not able to make progress?
655 */
656 static int xs_tcp_send_request(struct rpc_task *task)
657 {
658 struct rpc_rqst *req = task->tk_rqstp;
659 struct rpc_xprt *xprt = req->rq_xprt;
660 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
661 struct xdr_buf *xdr = &req->rq_snd_buf;
662 int status;
663
664 xs_encode_tcp_record_marker(&req->rq_snd_buf);
665
666 xs_pktdump("packet data:",
667 req->rq_svec->iov_base,
668 req->rq_svec->iov_len);
669
670 /* Continue transmitting the packet/record. We must be careful
671 * to cope with writespace callbacks arriving _after_ we have
672 * called sendmsg(). */
673 while (1) {
674 req->rq_xtime = jiffies;
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 -EAGAIN:
701 xs_nospace(task);
702 break;
703 case -ECONNREFUSED:
704 case -ECONNRESET:
705 case -ENOTCONN:
706 case -EPIPE:
707 status = -ENOTCONN;
708 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
709 break;
710 default:
711 dprintk("RPC: sendmsg returned unrecognized error %d\n",
712 -status);
713 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
714 xs_tcp_shutdown(xprt);
715 }
716
717 return status;
718 }
719
720 /**
721 * xs_tcp_release_xprt - clean up after a tcp transmission
722 * @xprt: transport
723 * @task: rpc task
724 *
725 * This cleans up if an error causes us to abort the transmission of a request.
726 * In this case, the socket may need to be reset in order to avoid confusing
727 * the server.
728 */
729 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
730 {
731 struct rpc_rqst *req;
732
733 if (task != xprt->snd_task)
734 return;
735 if (task == NULL)
736 goto out_release;
737 req = task->tk_rqstp;
738 if (req->rq_bytes_sent == 0)
739 goto out_release;
740 if (req->rq_bytes_sent == req->rq_snd_buf.len)
741 goto out_release;
742 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
743 out_release:
744 xprt_release_xprt(xprt, task);
745 }
746
747 /**
748 * xs_close - close a socket
749 * @xprt: transport
750 *
751 * This is used when all requests are complete; ie, no DRC state remains
752 * on the server we want to save.
753 */
754 static void xs_close(struct rpc_xprt *xprt)
755 {
756 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
757 struct socket *sock = transport->sock;
758 struct sock *sk = transport->inet;
759
760 if (!sk)
761 goto clear_close_wait;
762
763 dprintk("RPC: xs_close xprt %p\n", xprt);
764
765 write_lock_bh(&sk->sk_callback_lock);
766 transport->inet = NULL;
767 transport->sock = NULL;
768
769 sk->sk_user_data = NULL;
770 sk->sk_data_ready = transport->old_data_ready;
771 sk->sk_state_change = transport->old_state_change;
772 sk->sk_write_space = transport->old_write_space;
773 write_unlock_bh(&sk->sk_callback_lock);
774
775 sk->sk_no_check = 0;
776
777 sock_release(sock);
778 clear_close_wait:
779 smp_mb__before_clear_bit();
780 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
781 clear_bit(XPRT_CLOSING, &xprt->state);
782 smp_mb__after_clear_bit();
783 xprt_disconnect_done(xprt);
784 }
785
786 /**
787 * xs_destroy - prepare to shutdown a transport
788 * @xprt: doomed transport
789 *
790 */
791 static void xs_destroy(struct rpc_xprt *xprt)
792 {
793 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
794
795 dprintk("RPC: xs_destroy xprt %p\n", xprt);
796
797 cancel_rearming_delayed_work(&transport->connect_worker);
798
799 xs_close(xprt);
800 xs_free_peer_addresses(xprt);
801 kfree(xprt->slot);
802 kfree(xprt);
803 module_put(THIS_MODULE);
804 }
805
806 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
807 {
808 return (struct rpc_xprt *) sk->sk_user_data;
809 }
810
811 /**
812 * xs_udp_data_ready - "data ready" callback for UDP sockets
813 * @sk: socket with data to read
814 * @len: how much data to read
815 *
816 */
817 static void xs_udp_data_ready(struct sock *sk, int len)
818 {
819 struct rpc_task *task;
820 struct rpc_xprt *xprt;
821 struct rpc_rqst *rovr;
822 struct sk_buff *skb;
823 int err, repsize, copied;
824 u32 _xid;
825 __be32 *xp;
826
827 read_lock(&sk->sk_callback_lock);
828 dprintk("RPC: xs_udp_data_ready...\n");
829 if (!(xprt = xprt_from_sock(sk)))
830 goto out;
831
832 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
833 goto out;
834
835 if (xprt->shutdown)
836 goto dropit;
837
838 repsize = skb->len - sizeof(struct udphdr);
839 if (repsize < 4) {
840 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
841 goto dropit;
842 }
843
844 /* Copy the XID from the skb... */
845 xp = skb_header_pointer(skb, sizeof(struct udphdr),
846 sizeof(_xid), &_xid);
847 if (xp == NULL)
848 goto dropit;
849
850 /* Look up and lock the request corresponding to the given XID */
851 spin_lock(&xprt->transport_lock);
852 rovr = xprt_lookup_rqst(xprt, *xp);
853 if (!rovr)
854 goto out_unlock;
855 task = rovr->rq_task;
856
857 if ((copied = rovr->rq_private_buf.buflen) > repsize)
858 copied = repsize;
859
860 /* Suck it into the iovec, verify checksum if not done by hw. */
861 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
862 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
863 goto out_unlock;
864 }
865
866 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
867
868 /* Something worked... */
869 dst_confirm(skb->dst);
870
871 xprt_adjust_cwnd(task, copied);
872 xprt_update_rtt(task);
873 xprt_complete_rqst(task, copied);
874
875 out_unlock:
876 spin_unlock(&xprt->transport_lock);
877 dropit:
878 skb_free_datagram(sk, skb);
879 out:
880 read_unlock(&sk->sk_callback_lock);
881 }
882
883 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
884 {
885 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
886 size_t len, used;
887 char *p;
888
889 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
890 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
891 used = xdr_skb_read_bits(desc, p, len);
892 transport->tcp_offset += used;
893 if (used != len)
894 return;
895
896 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
897 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
898 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
899 else
900 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
901 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
902
903 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
904 transport->tcp_offset = 0;
905
906 /* Sanity check of the record length */
907 if (unlikely(transport->tcp_reclen < 4)) {
908 dprintk("RPC: invalid TCP record fragment length\n");
909 xprt_force_disconnect(xprt);
910 return;
911 }
912 dprintk("RPC: reading TCP record fragment of length %d\n",
913 transport->tcp_reclen);
914 }
915
916 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
917 {
918 if (transport->tcp_offset == transport->tcp_reclen) {
919 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
920 transport->tcp_offset = 0;
921 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
922 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
923 transport->tcp_flags |= TCP_RCV_COPY_XID;
924 transport->tcp_copied = 0;
925 }
926 }
927 }
928
929 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
930 {
931 size_t len, used;
932 char *p;
933
934 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
935 dprintk("RPC: reading XID (%Zu bytes)\n", len);
936 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
937 used = xdr_skb_read_bits(desc, p, len);
938 transport->tcp_offset += used;
939 if (used != len)
940 return;
941 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
942 transport->tcp_flags |= TCP_RCV_COPY_DATA;
943 transport->tcp_copied = 4;
944 dprintk("RPC: reading reply for XID %08x\n",
945 ntohl(transport->tcp_xid));
946 xs_tcp_check_fraghdr(transport);
947 }
948
949 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
950 {
951 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
952 struct rpc_rqst *req;
953 struct xdr_buf *rcvbuf;
954 size_t len;
955 ssize_t r;
956
957 /* Find and lock the request corresponding to this xid */
958 spin_lock(&xprt->transport_lock);
959 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
960 if (!req) {
961 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
962 dprintk("RPC: XID %08x request not found!\n",
963 ntohl(transport->tcp_xid));
964 spin_unlock(&xprt->transport_lock);
965 return;
966 }
967
968 rcvbuf = &req->rq_private_buf;
969 len = desc->count;
970 if (len > transport->tcp_reclen - transport->tcp_offset) {
971 struct xdr_skb_reader my_desc;
972
973 len = transport->tcp_reclen - transport->tcp_offset;
974 memcpy(&my_desc, desc, sizeof(my_desc));
975 my_desc.count = len;
976 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
977 &my_desc, xdr_skb_read_bits);
978 desc->count -= r;
979 desc->offset += r;
980 } else
981 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
982 desc, xdr_skb_read_bits);
983
984 if (r > 0) {
985 transport->tcp_copied += r;
986 transport->tcp_offset += r;
987 }
988 if (r != len) {
989 /* Error when copying to the receive buffer,
990 * usually because we weren't able to allocate
991 * additional buffer pages. All we can do now
992 * is turn off TCP_RCV_COPY_DATA, so the request
993 * will not receive any additional updates,
994 * and time out.
995 * Any remaining data from this record will
996 * be discarded.
997 */
998 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
999 dprintk("RPC: XID %08x truncated request\n",
1000 ntohl(transport->tcp_xid));
1001 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1002 "tcp_offset = %u, tcp_reclen = %u\n",
1003 xprt, transport->tcp_copied,
1004 transport->tcp_offset, transport->tcp_reclen);
1005 goto out;
1006 }
1007
1008 dprintk("RPC: XID %08x read %Zd bytes\n",
1009 ntohl(transport->tcp_xid), r);
1010 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1011 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1012 transport->tcp_offset, transport->tcp_reclen);
1013
1014 if (transport->tcp_copied == req->rq_private_buf.buflen)
1015 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1016 else if (transport->tcp_offset == transport->tcp_reclen) {
1017 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1018 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1019 }
1020
1021 out:
1022 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1023 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1024 spin_unlock(&xprt->transport_lock);
1025 xs_tcp_check_fraghdr(transport);
1026 }
1027
1028 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1029 {
1030 size_t len;
1031
1032 len = transport->tcp_reclen - transport->tcp_offset;
1033 if (len > desc->count)
1034 len = desc->count;
1035 desc->count -= len;
1036 desc->offset += len;
1037 transport->tcp_offset += len;
1038 dprintk("RPC: discarded %Zu bytes\n", len);
1039 xs_tcp_check_fraghdr(transport);
1040 }
1041
1042 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1043 {
1044 struct rpc_xprt *xprt = rd_desc->arg.data;
1045 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1046 struct xdr_skb_reader desc = {
1047 .skb = skb,
1048 .offset = offset,
1049 .count = len,
1050 };
1051
1052 dprintk("RPC: xs_tcp_data_recv started\n");
1053 do {
1054 /* Read in a new fragment marker if necessary */
1055 /* Can we ever really expect to get completely empty fragments? */
1056 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1057 xs_tcp_read_fraghdr(xprt, &desc);
1058 continue;
1059 }
1060 /* Read in the xid if necessary */
1061 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1062 xs_tcp_read_xid(transport, &desc);
1063 continue;
1064 }
1065 /* Read in the request data */
1066 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1067 xs_tcp_read_request(xprt, &desc);
1068 continue;
1069 }
1070 /* Skip over any trailing bytes on short reads */
1071 xs_tcp_read_discard(transport, &desc);
1072 } while (desc.count);
1073 dprintk("RPC: xs_tcp_data_recv done\n");
1074 return len - desc.count;
1075 }
1076
1077 /**
1078 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1079 * @sk: socket with data to read
1080 * @bytes: how much data to read
1081 *
1082 */
1083 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1084 {
1085 struct rpc_xprt *xprt;
1086 read_descriptor_t rd_desc;
1087 int read;
1088
1089 dprintk("RPC: xs_tcp_data_ready...\n");
1090
1091 read_lock(&sk->sk_callback_lock);
1092 if (!(xprt = xprt_from_sock(sk)))
1093 goto out;
1094 if (xprt->shutdown)
1095 goto out;
1096
1097 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1098 rd_desc.arg.data = xprt;
1099 do {
1100 rd_desc.count = 65536;
1101 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1102 } while (read > 0);
1103 out:
1104 read_unlock(&sk->sk_callback_lock);
1105 }
1106
1107 /**
1108 * xs_tcp_state_change - callback to handle TCP socket state changes
1109 * @sk: socket whose state has changed
1110 *
1111 */
1112 static void xs_tcp_state_change(struct sock *sk)
1113 {
1114 struct rpc_xprt *xprt;
1115
1116 read_lock(&sk->sk_callback_lock);
1117 if (!(xprt = xprt_from_sock(sk)))
1118 goto out;
1119 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1120 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1121 sk->sk_state, xprt_connected(xprt),
1122 sock_flag(sk, SOCK_DEAD),
1123 sock_flag(sk, SOCK_ZAPPED));
1124
1125 switch (sk->sk_state) {
1126 case TCP_ESTABLISHED:
1127 spin_lock_bh(&xprt->transport_lock);
1128 if (!xprt_test_and_set_connected(xprt)) {
1129 struct sock_xprt *transport = container_of(xprt,
1130 struct sock_xprt, xprt);
1131
1132 /* Reset TCP record info */
1133 transport->tcp_offset = 0;
1134 transport->tcp_reclen = 0;
1135 transport->tcp_copied = 0;
1136 transport->tcp_flags =
1137 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1138
1139 xprt_wake_pending_tasks(xprt, 0);
1140 }
1141 spin_unlock_bh(&xprt->transport_lock);
1142 break;
1143 case TCP_FIN_WAIT1:
1144 /* The client initiated a shutdown of the socket */
1145 xprt->connect_cookie++;
1146 xprt->reestablish_timeout = 0;
1147 set_bit(XPRT_CLOSING, &xprt->state);
1148 smp_mb__before_clear_bit();
1149 clear_bit(XPRT_CONNECTED, &xprt->state);
1150 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1151 smp_mb__after_clear_bit();
1152 break;
1153 case TCP_CLOSE_WAIT:
1154 /* The server initiated a shutdown of the socket */
1155 set_bit(XPRT_CLOSING, &xprt->state);
1156 xprt_force_disconnect(xprt);
1157 case TCP_SYN_SENT:
1158 xprt->connect_cookie++;
1159 case TCP_CLOSING:
1160 /*
1161 * If the server closed down the connection, make sure that
1162 * we back off before reconnecting
1163 */
1164 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1165 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1166 break;
1167 case TCP_LAST_ACK:
1168 smp_mb__before_clear_bit();
1169 clear_bit(XPRT_CONNECTED, &xprt->state);
1170 smp_mb__after_clear_bit();
1171 break;
1172 case TCP_CLOSE:
1173 smp_mb__before_clear_bit();
1174 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1175 clear_bit(XPRT_CLOSING, &xprt->state);
1176 smp_mb__after_clear_bit();
1177 /* Mark transport as closed and wake up all pending tasks */
1178 xprt_disconnect_done(xprt);
1179 }
1180 out:
1181 read_unlock(&sk->sk_callback_lock);
1182 }
1183
1184 /**
1185 * xs_udp_write_space - callback invoked when socket buffer space
1186 * becomes available
1187 * @sk: socket whose state has changed
1188 *
1189 * Called when more output buffer space is available for this socket.
1190 * We try not to wake our writers until they can make "significant"
1191 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1192 * with a bunch of small requests.
1193 */
1194 static void xs_udp_write_space(struct sock *sk)
1195 {
1196 read_lock(&sk->sk_callback_lock);
1197
1198 /* from net/core/sock.c:sock_def_write_space */
1199 if (sock_writeable(sk)) {
1200 struct socket *sock;
1201 struct rpc_xprt *xprt;
1202
1203 if (unlikely(!(sock = sk->sk_socket)))
1204 goto out;
1205 clear_bit(SOCK_NOSPACE, &sock->flags);
1206
1207 if (unlikely(!(xprt = xprt_from_sock(sk))))
1208 goto out;
1209 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1210 goto out;
1211
1212 xprt_write_space(xprt);
1213 }
1214
1215 out:
1216 read_unlock(&sk->sk_callback_lock);
1217 }
1218
1219 /**
1220 * xs_tcp_write_space - callback invoked when socket buffer space
1221 * becomes available
1222 * @sk: socket whose state has changed
1223 *
1224 * Called when more output buffer space is available for this socket.
1225 * We try not to wake our writers until they can make "significant"
1226 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1227 * with a bunch of small requests.
1228 */
1229 static void xs_tcp_write_space(struct sock *sk)
1230 {
1231 read_lock(&sk->sk_callback_lock);
1232
1233 /* from net/core/stream.c:sk_stream_write_space */
1234 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1235 struct socket *sock;
1236 struct rpc_xprt *xprt;
1237
1238 if (unlikely(!(sock = sk->sk_socket)))
1239 goto out;
1240 clear_bit(SOCK_NOSPACE, &sock->flags);
1241
1242 if (unlikely(!(xprt = xprt_from_sock(sk))))
1243 goto out;
1244 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1245 goto out;
1246
1247 xprt_write_space(xprt);
1248 }
1249
1250 out:
1251 read_unlock(&sk->sk_callback_lock);
1252 }
1253
1254 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1255 {
1256 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1257 struct sock *sk = transport->inet;
1258
1259 if (transport->rcvsize) {
1260 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1261 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1262 }
1263 if (transport->sndsize) {
1264 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1265 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1266 sk->sk_write_space(sk);
1267 }
1268 }
1269
1270 /**
1271 * xs_udp_set_buffer_size - set send and receive limits
1272 * @xprt: generic transport
1273 * @sndsize: requested size of send buffer, in bytes
1274 * @rcvsize: requested size of receive buffer, in bytes
1275 *
1276 * Set socket send and receive buffer size limits.
1277 */
1278 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1279 {
1280 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1281
1282 transport->sndsize = 0;
1283 if (sndsize)
1284 transport->sndsize = sndsize + 1024;
1285 transport->rcvsize = 0;
1286 if (rcvsize)
1287 transport->rcvsize = rcvsize + 1024;
1288
1289 xs_udp_do_set_buffer_size(xprt);
1290 }
1291
1292 /**
1293 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1294 * @task: task that timed out
1295 *
1296 * Adjust the congestion window after a retransmit timeout has occurred.
1297 */
1298 static void xs_udp_timer(struct rpc_task *task)
1299 {
1300 xprt_adjust_cwnd(task, -ETIMEDOUT);
1301 }
1302
1303 static unsigned short xs_get_random_port(void)
1304 {
1305 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1306 unsigned short rand = (unsigned short) net_random() % range;
1307 return rand + xprt_min_resvport;
1308 }
1309
1310 /**
1311 * xs_set_port - reset the port number in the remote endpoint address
1312 * @xprt: generic transport
1313 * @port: new port number
1314 *
1315 */
1316 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1317 {
1318 struct sockaddr *addr = xs_addr(xprt);
1319
1320 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1321
1322 switch (addr->sa_family) {
1323 case AF_INET:
1324 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1325 break;
1326 case AF_INET6:
1327 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1328 break;
1329 default:
1330 BUG();
1331 }
1332 }
1333
1334 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1335 {
1336 unsigned short port = transport->port;
1337
1338 if (port == 0 && transport->xprt.resvport)
1339 port = xs_get_random_port();
1340 return port;
1341 }
1342
1343 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1344 {
1345 if (transport->port != 0)
1346 transport->port = 0;
1347 if (!transport->xprt.resvport)
1348 return 0;
1349 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1350 return xprt_max_resvport;
1351 return --port;
1352 }
1353
1354 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1355 {
1356 struct sockaddr_in myaddr = {
1357 .sin_family = AF_INET,
1358 };
1359 struct sockaddr_in *sa;
1360 int err, nloop = 0;
1361 unsigned short port = xs_get_srcport(transport, sock);
1362 unsigned short last;
1363
1364 sa = (struct sockaddr_in *)&transport->addr;
1365 myaddr.sin_addr = sa->sin_addr;
1366 do {
1367 myaddr.sin_port = htons(port);
1368 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1369 sizeof(myaddr));
1370 if (port == 0)
1371 break;
1372 if (err == 0) {
1373 transport->port = port;
1374 break;
1375 }
1376 last = port;
1377 port = xs_next_srcport(transport, sock, port);
1378 if (port > last)
1379 nloop++;
1380 } while (err == -EADDRINUSE && nloop != 2);
1381 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1382 __func__, NIPQUAD(myaddr.sin_addr),
1383 port, err ? "failed" : "ok", err);
1384 return err;
1385 }
1386
1387 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1388 {
1389 struct sockaddr_in6 myaddr = {
1390 .sin6_family = AF_INET6,
1391 };
1392 struct sockaddr_in6 *sa;
1393 int err, nloop = 0;
1394 unsigned short port = xs_get_srcport(transport, sock);
1395 unsigned short last;
1396
1397 sa = (struct sockaddr_in6 *)&transport->addr;
1398 myaddr.sin6_addr = sa->sin6_addr;
1399 do {
1400 myaddr.sin6_port = htons(port);
1401 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1402 sizeof(myaddr));
1403 if (port == 0)
1404 break;
1405 if (err == 0) {
1406 transport->port = port;
1407 break;
1408 }
1409 last = port;
1410 port = xs_next_srcport(transport, sock, port);
1411 if (port > last)
1412 nloop++;
1413 } while (err == -EADDRINUSE && nloop != 2);
1414 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1415 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1416 return err;
1417 }
1418
1419 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1420 static struct lock_class_key xs_key[2];
1421 static struct lock_class_key xs_slock_key[2];
1422
1423 static inline void xs_reclassify_socket4(struct socket *sock)
1424 {
1425 struct sock *sk = sock->sk;
1426
1427 BUG_ON(sock_owned_by_user(sk));
1428 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1429 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1430 }
1431
1432 static inline void xs_reclassify_socket6(struct socket *sock)
1433 {
1434 struct sock *sk = sock->sk;
1435
1436 BUG_ON(sock_owned_by_user(sk));
1437 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1438 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1439 }
1440 #else
1441 static inline void xs_reclassify_socket4(struct socket *sock)
1442 {
1443 }
1444
1445 static inline void xs_reclassify_socket6(struct socket *sock)
1446 {
1447 }
1448 #endif
1449
1450 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1451 {
1452 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1453
1454 if (!transport->inet) {
1455 struct sock *sk = sock->sk;
1456
1457 write_lock_bh(&sk->sk_callback_lock);
1458
1459 sk->sk_user_data = xprt;
1460 transport->old_data_ready = sk->sk_data_ready;
1461 transport->old_state_change = sk->sk_state_change;
1462 transport->old_write_space = sk->sk_write_space;
1463 sk->sk_data_ready = xs_udp_data_ready;
1464 sk->sk_write_space = xs_udp_write_space;
1465 sk->sk_no_check = UDP_CSUM_NORCV;
1466 sk->sk_allocation = GFP_ATOMIC;
1467
1468 xprt_set_connected(xprt);
1469
1470 /* Reset to new socket */
1471 transport->sock = sock;
1472 transport->inet = sk;
1473
1474 write_unlock_bh(&sk->sk_callback_lock);
1475 }
1476 xs_udp_do_set_buffer_size(xprt);
1477 }
1478
1479 /**
1480 * xs_udp_connect_worker4 - set up a UDP socket
1481 * @work: RPC transport to connect
1482 *
1483 * Invoked by a work queue tasklet.
1484 */
1485 static void xs_udp_connect_worker4(struct work_struct *work)
1486 {
1487 struct sock_xprt *transport =
1488 container_of(work, struct sock_xprt, connect_worker.work);
1489 struct rpc_xprt *xprt = &transport->xprt;
1490 struct socket *sock = transport->sock;
1491 int err, status = -EIO;
1492
1493 if (xprt->shutdown || !xprt_bound(xprt))
1494 goto out;
1495
1496 /* Start by resetting any existing state */
1497 xs_close(xprt);
1498
1499 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1500 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1501 goto out;
1502 }
1503 xs_reclassify_socket4(sock);
1504
1505 if (xs_bind4(transport, sock)) {
1506 sock_release(sock);
1507 goto out;
1508 }
1509
1510 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1511 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1512
1513 xs_udp_finish_connecting(xprt, sock);
1514 status = 0;
1515 out:
1516 xprt_wake_pending_tasks(xprt, status);
1517 xprt_clear_connecting(xprt);
1518 }
1519
1520 /**
1521 * xs_udp_connect_worker6 - 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_worker6(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_INET6, 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_socket6(sock);
1545
1546 if (xs_bind6(transport, sock) < 0) {
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 * We need to preserve the port number so the reply cache on the server can
1563 * find our cached RPC replies when we get around to reconnecting.
1564 */
1565 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1566 {
1567 int result;
1568 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1569 struct sockaddr any;
1570
1571 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1572
1573 /*
1574 * Disconnect the transport socket by doing a connect operation
1575 * with AF_UNSPEC. This should return immediately...
1576 */
1577 memset(&any, 0, sizeof(any));
1578 any.sa_family = AF_UNSPEC;
1579 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1580 if (result)
1581 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1582 result);
1583 }
1584
1585 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1586 {
1587 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1588
1589 if (!transport->inet) {
1590 struct sock *sk = sock->sk;
1591
1592 write_lock_bh(&sk->sk_callback_lock);
1593
1594 sk->sk_user_data = xprt;
1595 transport->old_data_ready = sk->sk_data_ready;
1596 transport->old_state_change = sk->sk_state_change;
1597 transport->old_write_space = sk->sk_write_space;
1598 sk->sk_data_ready = xs_tcp_data_ready;
1599 sk->sk_state_change = xs_tcp_state_change;
1600 sk->sk_write_space = xs_tcp_write_space;
1601 sk->sk_allocation = GFP_ATOMIC;
1602
1603 /* socket options */
1604 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1605 sock_reset_flag(sk, SOCK_LINGER);
1606 tcp_sk(sk)->linger2 = 0;
1607 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1608
1609 xprt_clear_connected(xprt);
1610
1611 /* Reset to new socket */
1612 transport->sock = sock;
1613 transport->inet = sk;
1614
1615 write_unlock_bh(&sk->sk_callback_lock);
1616 }
1617
1618 /* Tell the socket layer to start connecting... */
1619 xprt->stat.connect_count++;
1620 xprt->stat.connect_start = jiffies;
1621 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1622 }
1623
1624 /**
1625 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1626 * @work: RPC transport to connect
1627 *
1628 * Invoked by a work queue tasklet.
1629 */
1630 static void xs_tcp_connect_worker4(struct work_struct *work)
1631 {
1632 struct sock_xprt *transport =
1633 container_of(work, struct sock_xprt, connect_worker.work);
1634 struct rpc_xprt *xprt = &transport->xprt;
1635 struct socket *sock = transport->sock;
1636 int err, status = -EIO;
1637
1638 if (xprt->shutdown || !xprt_bound(xprt))
1639 goto out;
1640
1641 if (!sock) {
1642 /* start from scratch */
1643 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1644 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1645 goto out;
1646 }
1647 xs_reclassify_socket4(sock);
1648
1649 if (xs_bind4(transport, sock) < 0) {
1650 sock_release(sock);
1651 goto out;
1652 }
1653 } else
1654 /* "close" the socket, preserving the local port */
1655 xs_tcp_reuse_connection(xprt);
1656
1657 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1658 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1659
1660 status = xs_tcp_finish_connecting(xprt, sock);
1661 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1662 xprt, -status, xprt_connected(xprt),
1663 sock->sk->sk_state);
1664 if (status < 0) {
1665 switch (status) {
1666 case -EINPROGRESS:
1667 case -EALREADY:
1668 goto out_clear;
1669 case -ECONNREFUSED:
1670 case -ECONNRESET:
1671 /* retry with existing socket, after a delay */
1672 break;
1673 default:
1674 /* get rid of existing socket, and retry */
1675 xs_tcp_shutdown(xprt);
1676 }
1677 }
1678 out:
1679 xprt_wake_pending_tasks(xprt, status);
1680 out_clear:
1681 xprt_clear_connecting(xprt);
1682 }
1683
1684 /**
1685 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1686 * @work: RPC transport to connect
1687 *
1688 * Invoked by a work queue tasklet.
1689 */
1690 static void xs_tcp_connect_worker6(struct work_struct *work)
1691 {
1692 struct sock_xprt *transport =
1693 container_of(work, struct sock_xprt, connect_worker.work);
1694 struct rpc_xprt *xprt = &transport->xprt;
1695 struct socket *sock = transport->sock;
1696 int err, status = -EIO;
1697
1698 if (xprt->shutdown || !xprt_bound(xprt))
1699 goto out;
1700
1701 if (!sock) {
1702 /* start from scratch */
1703 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1704 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1705 goto out;
1706 }
1707 xs_reclassify_socket6(sock);
1708
1709 if (xs_bind6(transport, sock) < 0) {
1710 sock_release(sock);
1711 goto out;
1712 }
1713 } else
1714 /* "close" the socket, preserving the local port */
1715 xs_tcp_reuse_connection(xprt);
1716
1717 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1718 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1719
1720 status = xs_tcp_finish_connecting(xprt, sock);
1721 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1722 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1723 if (status < 0) {
1724 switch (status) {
1725 case -EINPROGRESS:
1726 case -EALREADY:
1727 goto out_clear;
1728 case -ECONNREFUSED:
1729 case -ECONNRESET:
1730 /* retry with existing socket, after a delay */
1731 break;
1732 default:
1733 /* get rid of existing socket, and retry */
1734 xs_tcp_shutdown(xprt);
1735 }
1736 }
1737 out:
1738 xprt_wake_pending_tasks(xprt, status);
1739 out_clear:
1740 xprt_clear_connecting(xprt);
1741 }
1742
1743 /**
1744 * xs_connect - connect a socket to a remote endpoint
1745 * @task: address of RPC task that manages state of connect request
1746 *
1747 * TCP: If the remote end dropped the connection, delay reconnecting.
1748 *
1749 * UDP socket connects are synchronous, but we use a work queue anyway
1750 * to guarantee that even unprivileged user processes can set up a
1751 * socket on a privileged port.
1752 *
1753 * If a UDP socket connect fails, the delay behavior here prevents
1754 * retry floods (hard mounts).
1755 */
1756 static void xs_connect(struct rpc_task *task)
1757 {
1758 struct rpc_xprt *xprt = task->tk_xprt;
1759 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1760
1761 if (xprt_test_and_set_connecting(xprt))
1762 return;
1763
1764 if (transport->sock != NULL) {
1765 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1766 "seconds\n",
1767 xprt, xprt->reestablish_timeout / HZ);
1768 queue_delayed_work(rpciod_workqueue,
1769 &transport->connect_worker,
1770 xprt->reestablish_timeout);
1771 xprt->reestablish_timeout <<= 1;
1772 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1773 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1774 } else {
1775 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1776 queue_delayed_work(rpciod_workqueue,
1777 &transport->connect_worker, 0);
1778 }
1779 }
1780
1781 static void xs_tcp_connect(struct rpc_task *task)
1782 {
1783 struct rpc_xprt *xprt = task->tk_xprt;
1784
1785 /* Initiate graceful shutdown of the socket if not already done */
1786 if (test_bit(XPRT_CONNECTED, &xprt->state))
1787 xs_tcp_shutdown(xprt);
1788 /* Exit if we need to wait for socket shutdown to complete */
1789 if (test_bit(XPRT_CLOSING, &xprt->state))
1790 return;
1791 xs_connect(task);
1792 }
1793
1794 /**
1795 * xs_udp_print_stats - display UDP socket-specifc stats
1796 * @xprt: rpc_xprt struct containing statistics
1797 * @seq: output file
1798 *
1799 */
1800 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1801 {
1802 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1803
1804 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1805 transport->port,
1806 xprt->stat.bind_count,
1807 xprt->stat.sends,
1808 xprt->stat.recvs,
1809 xprt->stat.bad_xids,
1810 xprt->stat.req_u,
1811 xprt->stat.bklog_u);
1812 }
1813
1814 /**
1815 * xs_tcp_print_stats - display TCP socket-specifc stats
1816 * @xprt: rpc_xprt struct containing statistics
1817 * @seq: output file
1818 *
1819 */
1820 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1821 {
1822 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1823 long idle_time = 0;
1824
1825 if (xprt_connected(xprt))
1826 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1827
1828 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1829 transport->port,
1830 xprt->stat.bind_count,
1831 xprt->stat.connect_count,
1832 xprt->stat.connect_time,
1833 idle_time,
1834 xprt->stat.sends,
1835 xprt->stat.recvs,
1836 xprt->stat.bad_xids,
1837 xprt->stat.req_u,
1838 xprt->stat.bklog_u);
1839 }
1840
1841 static struct rpc_xprt_ops xs_udp_ops = {
1842 .set_buffer_size = xs_udp_set_buffer_size,
1843 .reserve_xprt = xprt_reserve_xprt_cong,
1844 .release_xprt = xprt_release_xprt_cong,
1845 .rpcbind = rpcb_getport_async,
1846 .set_port = xs_set_port,
1847 .connect = xs_connect,
1848 .buf_alloc = rpc_malloc,
1849 .buf_free = rpc_free,
1850 .send_request = xs_udp_send_request,
1851 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1852 .timer = xs_udp_timer,
1853 .release_request = xprt_release_rqst_cong,
1854 .close = xs_close,
1855 .destroy = xs_destroy,
1856 .print_stats = xs_udp_print_stats,
1857 };
1858
1859 static struct rpc_xprt_ops xs_tcp_ops = {
1860 .reserve_xprt = xprt_reserve_xprt,
1861 .release_xprt = xs_tcp_release_xprt,
1862 .rpcbind = rpcb_getport_async,
1863 .set_port = xs_set_port,
1864 .connect = xs_tcp_connect,
1865 .buf_alloc = rpc_malloc,
1866 .buf_free = rpc_free,
1867 .send_request = xs_tcp_send_request,
1868 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1869 .close = xs_tcp_shutdown,
1870 .destroy = xs_destroy,
1871 .print_stats = xs_tcp_print_stats,
1872 };
1873
1874 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1875 unsigned int slot_table_size)
1876 {
1877 struct rpc_xprt *xprt;
1878 struct sock_xprt *new;
1879
1880 if (args->addrlen > sizeof(xprt->addr)) {
1881 dprintk("RPC: xs_setup_xprt: address too large\n");
1882 return ERR_PTR(-EBADF);
1883 }
1884
1885 new = kzalloc(sizeof(*new), GFP_KERNEL);
1886 if (new == NULL) {
1887 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1888 "rpc_xprt\n");
1889 return ERR_PTR(-ENOMEM);
1890 }
1891 xprt = &new->xprt;
1892
1893 xprt->max_reqs = slot_table_size;
1894 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1895 if (xprt->slot == NULL) {
1896 kfree(xprt);
1897 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1898 "table\n");
1899 return ERR_PTR(-ENOMEM);
1900 }
1901
1902 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1903 xprt->addrlen = args->addrlen;
1904 if (args->srcaddr)
1905 memcpy(&new->addr, args->srcaddr, args->addrlen);
1906
1907 return xprt;
1908 }
1909
1910 static const struct rpc_timeout xs_udp_default_timeout = {
1911 .to_initval = 5 * HZ,
1912 .to_maxval = 30 * HZ,
1913 .to_increment = 5 * HZ,
1914 .to_retries = 5,
1915 };
1916
1917 /**
1918 * xs_setup_udp - Set up transport to use a UDP socket
1919 * @args: rpc transport creation arguments
1920 *
1921 */
1922 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1923 {
1924 struct sockaddr *addr = args->dstaddr;
1925 struct rpc_xprt *xprt;
1926 struct sock_xprt *transport;
1927
1928 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1929 if (IS_ERR(xprt))
1930 return xprt;
1931 transport = container_of(xprt, struct sock_xprt, xprt);
1932
1933 xprt->prot = IPPROTO_UDP;
1934 xprt->tsh_size = 0;
1935 /* XXX: header size can vary due to auth type, IPv6, etc. */
1936 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1937
1938 xprt->bind_timeout = XS_BIND_TO;
1939 xprt->connect_timeout = XS_UDP_CONN_TO;
1940 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1941 xprt->idle_timeout = XS_IDLE_DISC_TO;
1942
1943 xprt->ops = &xs_udp_ops;
1944
1945 xprt->timeout = &xs_udp_default_timeout;
1946
1947 switch (addr->sa_family) {
1948 case AF_INET:
1949 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1950 xprt_set_bound(xprt);
1951
1952 INIT_DELAYED_WORK(&transport->connect_worker,
1953 xs_udp_connect_worker4);
1954 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1955 break;
1956 case AF_INET6:
1957 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1958 xprt_set_bound(xprt);
1959
1960 INIT_DELAYED_WORK(&transport->connect_worker,
1961 xs_udp_connect_worker6);
1962 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1963 break;
1964 default:
1965 kfree(xprt);
1966 return ERR_PTR(-EAFNOSUPPORT);
1967 }
1968
1969 dprintk("RPC: set up transport to address %s\n",
1970 xprt->address_strings[RPC_DISPLAY_ALL]);
1971
1972 if (try_module_get(THIS_MODULE))
1973 return xprt;
1974
1975 kfree(xprt->slot);
1976 kfree(xprt);
1977 return ERR_PTR(-EINVAL);
1978 }
1979
1980 static const struct rpc_timeout xs_tcp_default_timeout = {
1981 .to_initval = 60 * HZ,
1982 .to_maxval = 60 * HZ,
1983 .to_retries = 2,
1984 };
1985
1986 /**
1987 * xs_setup_tcp - Set up transport to use a TCP socket
1988 * @args: rpc transport creation arguments
1989 *
1990 */
1991 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1992 {
1993 struct sockaddr *addr = args->dstaddr;
1994 struct rpc_xprt *xprt;
1995 struct sock_xprt *transport;
1996
1997 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1998 if (IS_ERR(xprt))
1999 return xprt;
2000 transport = container_of(xprt, struct sock_xprt, xprt);
2001
2002 xprt->prot = IPPROTO_TCP;
2003 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2004 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2005
2006 xprt->bind_timeout = XS_BIND_TO;
2007 xprt->connect_timeout = XS_TCP_CONN_TO;
2008 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2009 xprt->idle_timeout = XS_IDLE_DISC_TO;
2010
2011 xprt->ops = &xs_tcp_ops;
2012 xprt->timeout = &xs_tcp_default_timeout;
2013
2014 switch (addr->sa_family) {
2015 case AF_INET:
2016 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2017 xprt_set_bound(xprt);
2018
2019 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2020 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2021 break;
2022 case AF_INET6:
2023 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2024 xprt_set_bound(xprt);
2025
2026 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2027 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2028 break;
2029 default:
2030 kfree(xprt);
2031 return ERR_PTR(-EAFNOSUPPORT);
2032 }
2033
2034 dprintk("RPC: set up transport to address %s\n",
2035 xprt->address_strings[RPC_DISPLAY_ALL]);
2036
2037 if (try_module_get(THIS_MODULE))
2038 return xprt;
2039
2040 kfree(xprt->slot);
2041 kfree(xprt);
2042 return ERR_PTR(-EINVAL);
2043 }
2044
2045 static struct xprt_class xs_udp_transport = {
2046 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2047 .name = "udp",
2048 .owner = THIS_MODULE,
2049 .ident = IPPROTO_UDP,
2050 .setup = xs_setup_udp,
2051 };
2052
2053 static struct xprt_class xs_tcp_transport = {
2054 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2055 .name = "tcp",
2056 .owner = THIS_MODULE,
2057 .ident = IPPROTO_TCP,
2058 .setup = xs_setup_tcp,
2059 };
2060
2061 /**
2062 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2063 *
2064 */
2065 int init_socket_xprt(void)
2066 {
2067 #ifdef RPC_DEBUG
2068 if (!sunrpc_table_header)
2069 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2070 #endif
2071
2072 xprt_register_transport(&xs_udp_transport);
2073 xprt_register_transport(&xs_tcp_transport);
2074
2075 return 0;
2076 }
2077
2078 /**
2079 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2080 *
2081 */
2082 void cleanup_socket_xprt(void)
2083 {
2084 #ifdef RPC_DEBUG
2085 if (sunrpc_table_header) {
2086 unregister_sysctl_table(sunrpc_table_header);
2087 sunrpc_table_header = NULL;
2088 }
2089 #endif
2090
2091 xprt_unregister_transport(&xs_udp_transport);
2092 xprt_unregister_transport(&xs_tcp_transport);
2093 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree