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SUNRPC: Allow the client to detect if the TCP connection is closed
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * How many times to try sending a request on a socket before waiting
140 * for the socket buffer to clear.
141 */
142 #define XS_SENDMSG_RETRY (10U)
143
144 /*
145 * Time out for an RPC UDP socket connect. UDP socket connects are
146 * synchronous, but we set a timeout anyway in case of resource
147 * exhaustion on the local host.
148 */
149 #define XS_UDP_CONN_TO (5U * HZ)
150
151 /*
152 * Wait duration for an RPC TCP connection to be established. Solaris
153 * NFS over TCP uses 60 seconds, for example, which is in line with how
154 * long a server takes to reboot.
155 */
156 #define XS_TCP_CONN_TO (60U * HZ)
157
158 /*
159 * Wait duration for a reply from the RPC portmapper.
160 */
161 #define XS_BIND_TO (60U * HZ)
162
163 /*
164 * Delay if a UDP socket connect error occurs. This is most likely some
165 * kind of resource problem on the local host.
166 */
167 #define XS_UDP_REEST_TO (2U * HZ)
168
169 /*
170 * The reestablish timeout allows clients to delay for a bit before attempting
171 * to reconnect to a server that just dropped our connection.
172 *
173 * We implement an exponential backoff when trying to reestablish a TCP
174 * transport connection with the server. Some servers like to drop a TCP
175 * connection when they are overworked, so we start with a short timeout and
176 * increase over time if the server is down or not responding.
177 */
178 #define XS_TCP_INIT_REEST_TO (3U * HZ)
179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
180
181 /*
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
185 */
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
187
188 #ifdef RPC_DEBUG
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
191 #endif
192
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
195 {
196 u8 *buf = (u8 *) packet;
197 int j;
198
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
201 if (!(j & 31)) {
202 if (j)
203 dprintk("\n");
204 dprintk("0x%04x ", j);
205 }
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 }
209 dprintk("\n");
210 }
211 #else
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
213 {
214 /* NOP */
215 }
216 #endif
217
218 struct sock_xprt {
219 struct rpc_xprt xprt;
220
221 /*
222 * Network layer
223 */
224 struct socket * sock;
225 struct sock * inet;
226
227 /*
228 * State of TCP reply receive
229 */
230 __be32 tcp_fraghdr,
231 tcp_xid;
232
233 u32 tcp_offset,
234 tcp_reclen;
235
236 unsigned long tcp_copied,
237 tcp_flags;
238
239 /*
240 * Connection of transports
241 */
242 struct delayed_work connect_worker;
243 struct sockaddr_storage addr;
244 unsigned short port;
245
246 /*
247 * UDP socket buffer size parameters
248 */
249 size_t rcvsize,
250 sndsize;
251
252 /*
253 * Saved socket callback addresses
254 */
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(struct sock *);
258 };
259
260 /*
261 * TCP receive state flags
262 */
263 #define TCP_RCV_LAST_FRAG (1UL << 0)
264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265 #define TCP_RCV_COPY_XID (1UL << 2)
266 #define TCP_RCV_COPY_DATA (1UL << 3)
267
268 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in *) &xprt->addr;
276 }
277
278 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
279 {
280 return (struct sockaddr_in6 *) &xprt->addr;
281 }
282
283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
284 {
285 struct sockaddr_in *addr = xs_addr_in(xprt);
286 char *buf;
287
288 buf = kzalloc(20, GFP_KERNEL);
289 if (buf) {
290 snprintf(buf, 20, NIPQUAD_FMT,
291 NIPQUAD(addr->sin_addr.s_addr));
292 }
293 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
294
295 buf = kzalloc(8, GFP_KERNEL);
296 if (buf) {
297 snprintf(buf, 8, "%u",
298 ntohs(addr->sin_port));
299 }
300 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
301
302 buf = kzalloc(8, GFP_KERNEL);
303 if (buf) {
304 if (xprt->prot == IPPROTO_UDP)
305 snprintf(buf, 8, "udp");
306 else
307 snprintf(buf, 8, "tcp");
308 }
309 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
310
311 buf = kzalloc(48, GFP_KERNEL);
312 if (buf) {
313 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
314 NIPQUAD(addr->sin_addr.s_addr),
315 ntohs(addr->sin_port),
316 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
317 }
318 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
319
320 buf = kzalloc(10, GFP_KERNEL);
321 if (buf) {
322 snprintf(buf, 10, "%02x%02x%02x%02x",
323 NIPQUAD(addr->sin_addr.s_addr));
324 }
325 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
326
327 buf = kzalloc(8, GFP_KERNEL);
328 if (buf) {
329 snprintf(buf, 8, "%4hx",
330 ntohs(addr->sin_port));
331 }
332 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
333
334 buf = kzalloc(30, GFP_KERNEL);
335 if (buf) {
336 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
337 NIPQUAD(addr->sin_addr.s_addr),
338 ntohs(addr->sin_port) >> 8,
339 ntohs(addr->sin_port) & 0xff);
340 }
341 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
342
343 xprt->address_strings[RPC_DISPLAY_NETID] =
344 kstrdup(xprt->prot == IPPROTO_UDP ?
345 RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL);
346 }
347
348 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
349 {
350 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
351 char *buf;
352
353 buf = kzalloc(40, GFP_KERNEL);
354 if (buf) {
355 snprintf(buf, 40, NIP6_FMT,
356 NIP6(addr->sin6_addr));
357 }
358 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
359
360 buf = kzalloc(8, GFP_KERNEL);
361 if (buf) {
362 snprintf(buf, 8, "%u",
363 ntohs(addr->sin6_port));
364 }
365 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
366
367 buf = kzalloc(8, GFP_KERNEL);
368 if (buf) {
369 if (xprt->prot == IPPROTO_UDP)
370 snprintf(buf, 8, "udp");
371 else
372 snprintf(buf, 8, "tcp");
373 }
374 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
375
376 buf = kzalloc(64, GFP_KERNEL);
377 if (buf) {
378 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
379 NIP6(addr->sin6_addr),
380 ntohs(addr->sin6_port),
381 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
382 }
383 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
384
385 buf = kzalloc(36, GFP_KERNEL);
386 if (buf) {
387 snprintf(buf, 36, NIP6_SEQFMT,
388 NIP6(addr->sin6_addr));
389 }
390 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
391
392 buf = kzalloc(8, GFP_KERNEL);
393 if (buf) {
394 snprintf(buf, 8, "%4hx",
395 ntohs(addr->sin6_port));
396 }
397 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
398
399 buf = kzalloc(50, GFP_KERNEL);
400 if (buf) {
401 snprintf(buf, 50, NIP6_FMT".%u.%u",
402 NIP6(addr->sin6_addr),
403 ntohs(addr->sin6_port) >> 8,
404 ntohs(addr->sin6_port) & 0xff);
405 }
406 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
407
408 xprt->address_strings[RPC_DISPLAY_NETID] =
409 kstrdup(xprt->prot == IPPROTO_UDP ?
410 RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL);
411 }
412
413 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
414 {
415 int i;
416
417 for (i = 0; i < RPC_DISPLAY_MAX; i++)
418 kfree(xprt->address_strings[i]);
419 }
420
421 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
422
423 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
424 {
425 struct msghdr msg = {
426 .msg_name = addr,
427 .msg_namelen = addrlen,
428 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
429 };
430 struct kvec iov = {
431 .iov_base = vec->iov_base + base,
432 .iov_len = vec->iov_len - base,
433 };
434
435 if (iov.iov_len != 0)
436 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
437 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
438 }
439
440 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
441 {
442 struct page **ppage;
443 unsigned int remainder;
444 int err, sent = 0;
445
446 remainder = xdr->page_len - base;
447 base += xdr->page_base;
448 ppage = xdr->pages + (base >> PAGE_SHIFT);
449 base &= ~PAGE_MASK;
450 for(;;) {
451 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
452 int flags = XS_SENDMSG_FLAGS;
453
454 remainder -= len;
455 if (remainder != 0 || more)
456 flags |= MSG_MORE;
457 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
458 if (remainder == 0 || err != len)
459 break;
460 sent += err;
461 ppage++;
462 base = 0;
463 }
464 if (sent == 0)
465 return err;
466 if (err > 0)
467 sent += err;
468 return sent;
469 }
470
471 /**
472 * xs_sendpages - write pages directly to a socket
473 * @sock: socket to send on
474 * @addr: UDP only -- address of destination
475 * @addrlen: UDP only -- length of destination address
476 * @xdr: buffer containing this request
477 * @base: starting position in the buffer
478 *
479 */
480 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
481 {
482 unsigned int remainder = xdr->len - base;
483 int err, sent = 0;
484
485 if (unlikely(!sock))
486 return -ENOTCONN;
487
488 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
489 if (base != 0) {
490 addr = NULL;
491 addrlen = 0;
492 }
493
494 if (base < xdr->head[0].iov_len || addr != NULL) {
495 unsigned int len = xdr->head[0].iov_len - base;
496 remainder -= len;
497 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
498 if (remainder == 0 || err != len)
499 goto out;
500 sent += err;
501 base = 0;
502 } else
503 base -= xdr->head[0].iov_len;
504
505 if (base < xdr->page_len) {
506 unsigned int len = xdr->page_len - base;
507 remainder -= len;
508 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
509 if (remainder == 0 || err != len)
510 goto out;
511 sent += err;
512 base = 0;
513 } else
514 base -= xdr->page_len;
515
516 if (base >= xdr->tail[0].iov_len)
517 return sent;
518 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
519 out:
520 if (sent == 0)
521 return err;
522 if (err > 0)
523 sent += err;
524 return sent;
525 }
526
527 /**
528 * xs_nospace - place task on wait queue if transmit was incomplete
529 * @task: task to put to sleep
530 *
531 */
532 static void xs_nospace(struct rpc_task *task)
533 {
534 struct rpc_rqst *req = task->tk_rqstp;
535 struct rpc_xprt *xprt = req->rq_xprt;
536 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
537
538 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
539 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
540 req->rq_slen);
541
542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
543 /* Protect against races with write_space */
544 spin_lock_bh(&xprt->transport_lock);
545
546 /* Don't race with disconnect */
547 if (!xprt_connected(xprt))
548 task->tk_status = -ENOTCONN;
549 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
550 xprt_wait_for_buffer_space(task);
551
552 spin_unlock_bh(&xprt->transport_lock);
553 } else
554 /* Keep holding the socket if it is blocked */
555 rpc_delay(task, HZ>>4);
556 }
557
558 /**
559 * xs_udp_send_request - write an RPC request to a UDP socket
560 * @task: address of RPC task that manages the state of an RPC request
561 *
562 * Return values:
563 * 0: The request has been sent
564 * EAGAIN: The socket was blocked, please call again later to
565 * complete the request
566 * ENOTCONN: Caller needs to invoke connect logic then call again
567 * other: Some other error occured, the request was not sent
568 */
569 static int xs_udp_send_request(struct rpc_task *task)
570 {
571 struct rpc_rqst *req = task->tk_rqstp;
572 struct rpc_xprt *xprt = req->rq_xprt;
573 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_pktdump("packet data:",
578 req->rq_svec->iov_base,
579 req->rq_svec->iov_len);
580
581 req->rq_xtime = jiffies;
582 status = xs_sendpages(transport->sock,
583 xs_addr(xprt),
584 xprt->addrlen, xdr,
585 req->rq_bytes_sent);
586
587 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
588 xdr->len - req->rq_bytes_sent, status);
589
590 if (status >= 0) {
591 task->tk_bytes_sent += status;
592 if (status >= req->rq_slen)
593 return 0;
594 /* Still some bytes left; set up for a retry later. */
595 status = -EAGAIN;
596 }
597
598 switch (status) {
599 case -ENETUNREACH:
600 case -EPIPE:
601 case -ECONNREFUSED:
602 /* When the server has died, an ICMP port unreachable message
603 * prompts ECONNREFUSED. */
604 break;
605 case -EAGAIN:
606 xs_nospace(task);
607 break;
608 default:
609 dprintk("RPC: sendmsg returned unrecognized error %d\n",
610 -status);
611 break;
612 }
613
614 return status;
615 }
616
617 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
618 {
619 u32 reclen = buf->len - sizeof(rpc_fraghdr);
620 rpc_fraghdr *base = buf->head[0].iov_base;
621 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
622 }
623
624 /**
625 * xs_tcp_send_request - write an RPC request to a TCP socket
626 * @task: address of RPC task that manages the state of an RPC request
627 *
628 * Return values:
629 * 0: The request has been sent
630 * EAGAIN: The socket was blocked, please call again later to
631 * complete the request
632 * ENOTCONN: Caller needs to invoke connect logic then call again
633 * other: Some other error occured, the request was not sent
634 *
635 * XXX: In the case of soft timeouts, should we eventually give up
636 * if sendmsg is not able to make progress?
637 */
638 static int xs_tcp_send_request(struct rpc_task *task)
639 {
640 struct rpc_rqst *req = task->tk_rqstp;
641 struct rpc_xprt *xprt = req->rq_xprt;
642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
643 struct xdr_buf *xdr = &req->rq_snd_buf;
644 int status;
645 unsigned int retry = 0;
646
647 xs_encode_tcp_record_marker(&req->rq_snd_buf);
648
649 xs_pktdump("packet data:",
650 req->rq_svec->iov_base,
651 req->rq_svec->iov_len);
652
653 /* Continue transmitting the packet/record. We must be careful
654 * to cope with writespace callbacks arriving _after_ we have
655 * called sendmsg(). */
656 while (1) {
657 req->rq_xtime = jiffies;
658 status = xs_sendpages(transport->sock,
659 NULL, 0, xdr, req->rq_bytes_sent);
660
661 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
662 xdr->len - req->rq_bytes_sent, status);
663
664 if (unlikely(status < 0))
665 break;
666
667 /* If we've sent the entire packet, immediately
668 * reset the count of bytes sent. */
669 req->rq_bytes_sent += status;
670 task->tk_bytes_sent += status;
671 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
672 req->rq_bytes_sent = 0;
673 return 0;
674 }
675
676 status = -EAGAIN;
677 if (retry++ > XS_SENDMSG_RETRY)
678 break;
679 }
680
681 switch (status) {
682 case -EAGAIN:
683 xs_nospace(task);
684 break;
685 case -ECONNREFUSED:
686 case -ECONNRESET:
687 case -ENOTCONN:
688 case -EPIPE:
689 status = -ENOTCONN;
690 break;
691 default:
692 dprintk("RPC: sendmsg returned unrecognized error %d\n",
693 -status);
694 xprt_disconnect(xprt);
695 break;
696 }
697
698 return status;
699 }
700
701 /**
702 * xs_tcp_release_xprt - clean up after a tcp transmission
703 * @xprt: transport
704 * @task: rpc task
705 *
706 * This cleans up if an error causes us to abort the transmission of a request.
707 * In this case, the socket may need to be reset in order to avoid confusing
708 * the server.
709 */
710 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
711 {
712 struct rpc_rqst *req;
713
714 if (task != xprt->snd_task)
715 return;
716 if (task == NULL)
717 goto out_release;
718 req = task->tk_rqstp;
719 if (req->rq_bytes_sent == 0)
720 goto out_release;
721 if (req->rq_bytes_sent == req->rq_snd_buf.len)
722 goto out_release;
723 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
724 out_release:
725 xprt_release_xprt(xprt, task);
726 }
727
728 /**
729 * xs_close - close a socket
730 * @xprt: transport
731 *
732 * This is used when all requests are complete; ie, no DRC state remains
733 * on the server we want to save.
734 */
735 static void xs_close(struct rpc_xprt *xprt)
736 {
737 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
738 struct socket *sock = transport->sock;
739 struct sock *sk = transport->inet;
740
741 if (!sk)
742 goto clear_close_wait;
743
744 dprintk("RPC: xs_close xprt %p\n", xprt);
745
746 write_lock_bh(&sk->sk_callback_lock);
747 transport->inet = NULL;
748 transport->sock = NULL;
749
750 sk->sk_user_data = NULL;
751 sk->sk_data_ready = transport->old_data_ready;
752 sk->sk_state_change = transport->old_state_change;
753 sk->sk_write_space = transport->old_write_space;
754 write_unlock_bh(&sk->sk_callback_lock);
755
756 sk->sk_no_check = 0;
757
758 sock_release(sock);
759 clear_close_wait:
760 smp_mb__before_clear_bit();
761 clear_bit(XPRT_CONNECTED, &xprt->state);
762 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
763 clear_bit(XPRT_CLOSING, &xprt->state);
764 smp_mb__after_clear_bit();
765 }
766
767 /**
768 * xs_destroy - prepare to shutdown a transport
769 * @xprt: doomed transport
770 *
771 */
772 static void xs_destroy(struct rpc_xprt *xprt)
773 {
774 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
775
776 dprintk("RPC: xs_destroy xprt %p\n", xprt);
777
778 cancel_rearming_delayed_work(&transport->connect_worker);
779
780 xprt_disconnect(xprt);
781 xs_close(xprt);
782 xs_free_peer_addresses(xprt);
783 kfree(xprt->slot);
784 kfree(xprt);
785 module_put(THIS_MODULE);
786 }
787
788 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
789 {
790 return (struct rpc_xprt *) sk->sk_user_data;
791 }
792
793 /**
794 * xs_udp_data_ready - "data ready" callback for UDP sockets
795 * @sk: socket with data to read
796 * @len: how much data to read
797 *
798 */
799 static void xs_udp_data_ready(struct sock *sk, int len)
800 {
801 struct rpc_task *task;
802 struct rpc_xprt *xprt;
803 struct rpc_rqst *rovr;
804 struct sk_buff *skb;
805 int err, repsize, copied;
806 u32 _xid;
807 __be32 *xp;
808
809 read_lock(&sk->sk_callback_lock);
810 dprintk("RPC: xs_udp_data_ready...\n");
811 if (!(xprt = xprt_from_sock(sk)))
812 goto out;
813
814 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
815 goto out;
816
817 if (xprt->shutdown)
818 goto dropit;
819
820 repsize = skb->len - sizeof(struct udphdr);
821 if (repsize < 4) {
822 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
823 goto dropit;
824 }
825
826 /* Copy the XID from the skb... */
827 xp = skb_header_pointer(skb, sizeof(struct udphdr),
828 sizeof(_xid), &_xid);
829 if (xp == NULL)
830 goto dropit;
831
832 /* Look up and lock the request corresponding to the given XID */
833 spin_lock(&xprt->transport_lock);
834 rovr = xprt_lookup_rqst(xprt, *xp);
835 if (!rovr)
836 goto out_unlock;
837 task = rovr->rq_task;
838
839 if ((copied = rovr->rq_private_buf.buflen) > repsize)
840 copied = repsize;
841
842 /* Suck it into the iovec, verify checksum if not done by hw. */
843 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
844 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
845 goto out_unlock;
846 }
847
848 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
849
850 /* Something worked... */
851 dst_confirm(skb->dst);
852
853 xprt_adjust_cwnd(task, copied);
854 xprt_update_rtt(task);
855 xprt_complete_rqst(task, copied);
856
857 out_unlock:
858 spin_unlock(&xprt->transport_lock);
859 dropit:
860 skb_free_datagram(sk, skb);
861 out:
862 read_unlock(&sk->sk_callback_lock);
863 }
864
865 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
866 {
867 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
868 size_t len, used;
869 char *p;
870
871 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
872 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
873 used = xdr_skb_read_bits(desc, p, len);
874 transport->tcp_offset += used;
875 if (used != len)
876 return;
877
878 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
879 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
880 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
881 else
882 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
883 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
884
885 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
886 transport->tcp_offset = 0;
887
888 /* Sanity check of the record length */
889 if (unlikely(transport->tcp_reclen < 4)) {
890 dprintk("RPC: invalid TCP record fragment length\n");
891 xprt_disconnect(xprt);
892 return;
893 }
894 dprintk("RPC: reading TCP record fragment of length %d\n",
895 transport->tcp_reclen);
896 }
897
898 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
899 {
900 if (transport->tcp_offset == transport->tcp_reclen) {
901 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
902 transport->tcp_offset = 0;
903 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
904 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
905 transport->tcp_flags |= TCP_RCV_COPY_XID;
906 transport->tcp_copied = 0;
907 }
908 }
909 }
910
911 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
912 {
913 size_t len, used;
914 char *p;
915
916 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
917 dprintk("RPC: reading XID (%Zu bytes)\n", len);
918 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
919 used = xdr_skb_read_bits(desc, p, len);
920 transport->tcp_offset += used;
921 if (used != len)
922 return;
923 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
924 transport->tcp_flags |= TCP_RCV_COPY_DATA;
925 transport->tcp_copied = 4;
926 dprintk("RPC: reading reply for XID %08x\n",
927 ntohl(transport->tcp_xid));
928 xs_tcp_check_fraghdr(transport);
929 }
930
931 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
932 {
933 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
934 struct rpc_rqst *req;
935 struct xdr_buf *rcvbuf;
936 size_t len;
937 ssize_t r;
938
939 /* Find and lock the request corresponding to this xid */
940 spin_lock(&xprt->transport_lock);
941 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
942 if (!req) {
943 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
944 dprintk("RPC: XID %08x request not found!\n",
945 ntohl(transport->tcp_xid));
946 spin_unlock(&xprt->transport_lock);
947 return;
948 }
949
950 rcvbuf = &req->rq_private_buf;
951 len = desc->count;
952 if (len > transport->tcp_reclen - transport->tcp_offset) {
953 struct xdr_skb_reader my_desc;
954
955 len = transport->tcp_reclen - transport->tcp_offset;
956 memcpy(&my_desc, desc, sizeof(my_desc));
957 my_desc.count = len;
958 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
959 &my_desc, xdr_skb_read_bits);
960 desc->count -= r;
961 desc->offset += r;
962 } else
963 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
964 desc, xdr_skb_read_bits);
965
966 if (r > 0) {
967 transport->tcp_copied += r;
968 transport->tcp_offset += r;
969 }
970 if (r != len) {
971 /* Error when copying to the receive buffer,
972 * usually because we weren't able to allocate
973 * additional buffer pages. All we can do now
974 * is turn off TCP_RCV_COPY_DATA, so the request
975 * will not receive any additional updates,
976 * and time out.
977 * Any remaining data from this record will
978 * be discarded.
979 */
980 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
981 dprintk("RPC: XID %08x truncated request\n",
982 ntohl(transport->tcp_xid));
983 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
984 "tcp_offset = %u, tcp_reclen = %u\n",
985 xprt, transport->tcp_copied,
986 transport->tcp_offset, transport->tcp_reclen);
987 goto out;
988 }
989
990 dprintk("RPC: XID %08x read %Zd bytes\n",
991 ntohl(transport->tcp_xid), r);
992 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
993 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
994 transport->tcp_offset, transport->tcp_reclen);
995
996 if (transport->tcp_copied == req->rq_private_buf.buflen)
997 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
998 else if (transport->tcp_offset == transport->tcp_reclen) {
999 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1000 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1001 }
1002
1003 out:
1004 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1005 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1006 spin_unlock(&xprt->transport_lock);
1007 xs_tcp_check_fraghdr(transport);
1008 }
1009
1010 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1011 {
1012 size_t len;
1013
1014 len = transport->tcp_reclen - transport->tcp_offset;
1015 if (len > desc->count)
1016 len = desc->count;
1017 desc->count -= len;
1018 desc->offset += len;
1019 transport->tcp_offset += len;
1020 dprintk("RPC: discarded %Zu bytes\n", len);
1021 xs_tcp_check_fraghdr(transport);
1022 }
1023
1024 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1025 {
1026 struct rpc_xprt *xprt = rd_desc->arg.data;
1027 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1028 struct xdr_skb_reader desc = {
1029 .skb = skb,
1030 .offset = offset,
1031 .count = len,
1032 };
1033
1034 dprintk("RPC: xs_tcp_data_recv started\n");
1035 do {
1036 /* Read in a new fragment marker if necessary */
1037 /* Can we ever really expect to get completely empty fragments? */
1038 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1039 xs_tcp_read_fraghdr(xprt, &desc);
1040 continue;
1041 }
1042 /* Read in the xid if necessary */
1043 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1044 xs_tcp_read_xid(transport, &desc);
1045 continue;
1046 }
1047 /* Read in the request data */
1048 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1049 xs_tcp_read_request(xprt, &desc);
1050 continue;
1051 }
1052 /* Skip over any trailing bytes on short reads */
1053 xs_tcp_read_discard(transport, &desc);
1054 } while (desc.count);
1055 dprintk("RPC: xs_tcp_data_recv done\n");
1056 return len - desc.count;
1057 }
1058
1059 /**
1060 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1061 * @sk: socket with data to read
1062 * @bytes: how much data to read
1063 *
1064 */
1065 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1066 {
1067 struct rpc_xprt *xprt;
1068 read_descriptor_t rd_desc;
1069
1070 dprintk("RPC: xs_tcp_data_ready...\n");
1071
1072 read_lock(&sk->sk_callback_lock);
1073 if (!(xprt = xprt_from_sock(sk)))
1074 goto out;
1075 if (xprt->shutdown)
1076 goto out;
1077
1078 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1079 rd_desc.arg.data = xprt;
1080 rd_desc.count = 65536;
1081 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1082 out:
1083 read_unlock(&sk->sk_callback_lock);
1084 }
1085
1086 /**
1087 * xs_tcp_state_change - callback to handle TCP socket state changes
1088 * @sk: socket whose state has changed
1089 *
1090 */
1091 static void xs_tcp_state_change(struct sock *sk)
1092 {
1093 struct rpc_xprt *xprt;
1094
1095 read_lock(&sk->sk_callback_lock);
1096 if (!(xprt = xprt_from_sock(sk)))
1097 goto out;
1098 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1099 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1100 sk->sk_state, xprt_connected(xprt),
1101 sock_flag(sk, SOCK_DEAD),
1102 sock_flag(sk, SOCK_ZAPPED));
1103
1104 switch (sk->sk_state) {
1105 case TCP_ESTABLISHED:
1106 spin_lock_bh(&xprt->transport_lock);
1107 if (!xprt_test_and_set_connected(xprt)) {
1108 struct sock_xprt *transport = container_of(xprt,
1109 struct sock_xprt, xprt);
1110
1111 /* Reset TCP record info */
1112 transport->tcp_offset = 0;
1113 transport->tcp_reclen = 0;
1114 transport->tcp_copied = 0;
1115 transport->tcp_flags =
1116 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1117
1118 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1119 xprt_wake_pending_tasks(xprt, 0);
1120 }
1121 spin_unlock_bh(&xprt->transport_lock);
1122 break;
1123 case TCP_FIN_WAIT1:
1124 /* The client initiated a shutdown of the socket */
1125 set_bit(XPRT_CLOSING, &xprt->state);
1126 smp_mb__before_clear_bit();
1127 clear_bit(XPRT_CONNECTED, &xprt->state);
1128 smp_mb__after_clear_bit();
1129 break;
1130 case TCP_CLOSE_WAIT:
1131 /* The server initiated a shutdown of the socket */
1132 set_bit(XPRT_CLOSING, &xprt->state);
1133 xprt_force_disconnect(xprt);
1134 break;
1135 case TCP_LAST_ACK:
1136 smp_mb__before_clear_bit();
1137 clear_bit(XPRT_CONNECTED, &xprt->state);
1138 smp_mb__after_clear_bit();
1139 break;
1140 case TCP_CLOSE:
1141 smp_mb__before_clear_bit();
1142 clear_bit(XPRT_CLOSING, &xprt->state);
1143 smp_mb__after_clear_bit();
1144 /* Mark transport as closed and wake up all pending tasks */
1145 xprt_disconnect(xprt);
1146 }
1147 out:
1148 read_unlock(&sk->sk_callback_lock);
1149 }
1150
1151 /**
1152 * xs_udp_write_space - callback invoked when socket buffer space
1153 * becomes available
1154 * @sk: socket whose state has changed
1155 *
1156 * Called when more output buffer space is available for this socket.
1157 * We try not to wake our writers until they can make "significant"
1158 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1159 * with a bunch of small requests.
1160 */
1161 static void xs_udp_write_space(struct sock *sk)
1162 {
1163 read_lock(&sk->sk_callback_lock);
1164
1165 /* from net/core/sock.c:sock_def_write_space */
1166 if (sock_writeable(sk)) {
1167 struct socket *sock;
1168 struct rpc_xprt *xprt;
1169
1170 if (unlikely(!(sock = sk->sk_socket)))
1171 goto out;
1172 if (unlikely(!(xprt = xprt_from_sock(sk))))
1173 goto out;
1174 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1175 goto out;
1176
1177 xprt_write_space(xprt);
1178 }
1179
1180 out:
1181 read_unlock(&sk->sk_callback_lock);
1182 }
1183
1184 /**
1185 * xs_tcp_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_tcp_write_space(struct sock *sk)
1195 {
1196 read_lock(&sk->sk_callback_lock);
1197
1198 /* from net/core/stream.c:sk_stream_write_space */
1199 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1200 struct socket *sock;
1201 struct rpc_xprt *xprt;
1202
1203 if (unlikely(!(sock = sk->sk_socket)))
1204 goto out;
1205 if (unlikely(!(xprt = xprt_from_sock(sk))))
1206 goto out;
1207 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1208 goto out;
1209
1210 xprt_write_space(xprt);
1211 }
1212
1213 out:
1214 read_unlock(&sk->sk_callback_lock);
1215 }
1216
1217 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1218 {
1219 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1220 struct sock *sk = transport->inet;
1221
1222 if (transport->rcvsize) {
1223 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1224 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1225 }
1226 if (transport->sndsize) {
1227 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1228 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1229 sk->sk_write_space(sk);
1230 }
1231 }
1232
1233 /**
1234 * xs_udp_set_buffer_size - set send and receive limits
1235 * @xprt: generic transport
1236 * @sndsize: requested size of send buffer, in bytes
1237 * @rcvsize: requested size of receive buffer, in bytes
1238 *
1239 * Set socket send and receive buffer size limits.
1240 */
1241 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1242 {
1243 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1244
1245 transport->sndsize = 0;
1246 if (sndsize)
1247 transport->sndsize = sndsize + 1024;
1248 transport->rcvsize = 0;
1249 if (rcvsize)
1250 transport->rcvsize = rcvsize + 1024;
1251
1252 xs_udp_do_set_buffer_size(xprt);
1253 }
1254
1255 /**
1256 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1257 * @task: task that timed out
1258 *
1259 * Adjust the congestion window after a retransmit timeout has occurred.
1260 */
1261 static void xs_udp_timer(struct rpc_task *task)
1262 {
1263 xprt_adjust_cwnd(task, -ETIMEDOUT);
1264 }
1265
1266 static unsigned short xs_get_random_port(void)
1267 {
1268 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1269 unsigned short rand = (unsigned short) net_random() % range;
1270 return rand + xprt_min_resvport;
1271 }
1272
1273 /**
1274 * xs_set_port - reset the port number in the remote endpoint address
1275 * @xprt: generic transport
1276 * @port: new port number
1277 *
1278 */
1279 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1280 {
1281 struct sockaddr *addr = xs_addr(xprt);
1282
1283 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1284
1285 switch (addr->sa_family) {
1286 case AF_INET:
1287 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1288 break;
1289 case AF_INET6:
1290 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1291 break;
1292 default:
1293 BUG();
1294 }
1295 }
1296
1297 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1298 {
1299 unsigned short port = transport->port;
1300
1301 if (port == 0 && transport->xprt.resvport)
1302 port = xs_get_random_port();
1303 return port;
1304 }
1305
1306 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1307 {
1308 if (transport->port != 0)
1309 transport->port = 0;
1310 if (!transport->xprt.resvport)
1311 return 0;
1312 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1313 return xprt_max_resvport;
1314 return --port;
1315 }
1316
1317 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1318 {
1319 struct sockaddr_in myaddr = {
1320 .sin_family = AF_INET,
1321 };
1322 struct sockaddr_in *sa;
1323 int err, nloop = 0;
1324 unsigned short port = xs_get_srcport(transport, sock);
1325 unsigned short last;
1326
1327 sa = (struct sockaddr_in *)&transport->addr;
1328 myaddr.sin_addr = sa->sin_addr;
1329 do {
1330 myaddr.sin_port = htons(port);
1331 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1332 sizeof(myaddr));
1333 if (port == 0)
1334 break;
1335 if (err == 0) {
1336 transport->port = port;
1337 break;
1338 }
1339 last = port;
1340 port = xs_next_srcport(transport, sock, port);
1341 if (port > last)
1342 nloop++;
1343 } while (err == -EADDRINUSE && nloop != 2);
1344 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1345 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1346 port, err ? "failed" : "ok", err);
1347 return err;
1348 }
1349
1350 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1351 {
1352 struct sockaddr_in6 myaddr = {
1353 .sin6_family = AF_INET6,
1354 };
1355 struct sockaddr_in6 *sa;
1356 int err, nloop = 0;
1357 unsigned short port = xs_get_srcport(transport, sock);
1358 unsigned short last;
1359
1360 sa = (struct sockaddr_in6 *)&transport->addr;
1361 myaddr.sin6_addr = sa->sin6_addr;
1362 do {
1363 myaddr.sin6_port = htons(port);
1364 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1365 sizeof(myaddr));
1366 if (port == 0)
1367 break;
1368 if (err == 0) {
1369 transport->port = port;
1370 break;
1371 }
1372 last = port;
1373 port = xs_next_srcport(transport, sock, port);
1374 if (port > last)
1375 nloop++;
1376 } while (err == -EADDRINUSE && nloop != 2);
1377 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1378 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1379 return err;
1380 }
1381
1382 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1383 static struct lock_class_key xs_key[2];
1384 static struct lock_class_key xs_slock_key[2];
1385
1386 static inline void xs_reclassify_socket4(struct socket *sock)
1387 {
1388 struct sock *sk = sock->sk;
1389
1390 BUG_ON(sock_owned_by_user(sk));
1391 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1392 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1393 }
1394
1395 static inline void xs_reclassify_socket6(struct socket *sock)
1396 {
1397 struct sock *sk = sock->sk;
1398
1399 BUG_ON(sock_owned_by_user(sk));
1400 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1401 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1402 }
1403 #else
1404 static inline void xs_reclassify_socket4(struct socket *sock)
1405 {
1406 }
1407
1408 static inline void xs_reclassify_socket6(struct socket *sock)
1409 {
1410 }
1411 #endif
1412
1413 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1414 {
1415 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1416
1417 if (!transport->inet) {
1418 struct sock *sk = sock->sk;
1419
1420 write_lock_bh(&sk->sk_callback_lock);
1421
1422 sk->sk_user_data = xprt;
1423 transport->old_data_ready = sk->sk_data_ready;
1424 transport->old_state_change = sk->sk_state_change;
1425 transport->old_write_space = sk->sk_write_space;
1426 sk->sk_data_ready = xs_udp_data_ready;
1427 sk->sk_write_space = xs_udp_write_space;
1428 sk->sk_no_check = UDP_CSUM_NORCV;
1429 sk->sk_allocation = GFP_ATOMIC;
1430
1431 xprt_set_connected(xprt);
1432
1433 /* Reset to new socket */
1434 transport->sock = sock;
1435 transport->inet = sk;
1436
1437 write_unlock_bh(&sk->sk_callback_lock);
1438 }
1439 xs_udp_do_set_buffer_size(xprt);
1440 }
1441
1442 /**
1443 * xs_udp_connect_worker4 - set up a UDP socket
1444 * @work: RPC transport to connect
1445 *
1446 * Invoked by a work queue tasklet.
1447 */
1448 static void xs_udp_connect_worker4(struct work_struct *work)
1449 {
1450 struct sock_xprt *transport =
1451 container_of(work, struct sock_xprt, connect_worker.work);
1452 struct rpc_xprt *xprt = &transport->xprt;
1453 struct socket *sock = transport->sock;
1454 int err, status = -EIO;
1455
1456 if (xprt->shutdown || !xprt_bound(xprt))
1457 goto out;
1458
1459 /* Start by resetting any existing state */
1460 xs_close(xprt);
1461
1462 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1463 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1464 goto out;
1465 }
1466 xs_reclassify_socket4(sock);
1467
1468 if (xs_bind4(transport, sock)) {
1469 sock_release(sock);
1470 goto out;
1471 }
1472
1473 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1474 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1475
1476 xs_udp_finish_connecting(xprt, sock);
1477 status = 0;
1478 out:
1479 xprt_wake_pending_tasks(xprt, status);
1480 xprt_clear_connecting(xprt);
1481 }
1482
1483 /**
1484 * xs_udp_connect_worker6 - set up a UDP socket
1485 * @work: RPC transport to connect
1486 *
1487 * Invoked by a work queue tasklet.
1488 */
1489 static void xs_udp_connect_worker6(struct work_struct *work)
1490 {
1491 struct sock_xprt *transport =
1492 container_of(work, struct sock_xprt, connect_worker.work);
1493 struct rpc_xprt *xprt = &transport->xprt;
1494 struct socket *sock = transport->sock;
1495 int err, status = -EIO;
1496
1497 if (xprt->shutdown || !xprt_bound(xprt))
1498 goto out;
1499
1500 /* Start by resetting any existing state */
1501 xs_close(xprt);
1502
1503 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1504 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1505 goto out;
1506 }
1507 xs_reclassify_socket6(sock);
1508
1509 if (xs_bind6(transport, sock) < 0) {
1510 sock_release(sock);
1511 goto out;
1512 }
1513
1514 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1515 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1516
1517 xs_udp_finish_connecting(xprt, sock);
1518 status = 0;
1519 out:
1520 xprt_wake_pending_tasks(xprt, status);
1521 xprt_clear_connecting(xprt);
1522 }
1523
1524 /*
1525 * We need to preserve the port number so the reply cache on the server can
1526 * find our cached RPC replies when we get around to reconnecting.
1527 */
1528 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1529 {
1530 int result;
1531 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1532 struct sockaddr any;
1533
1534 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1535
1536 /*
1537 * Disconnect the transport socket by doing a connect operation
1538 * with AF_UNSPEC. This should return immediately...
1539 */
1540 memset(&any, 0, sizeof(any));
1541 any.sa_family = AF_UNSPEC;
1542 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1543 if (result)
1544 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1545 result);
1546 }
1547
1548 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1549 {
1550 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1551
1552 if (!transport->inet) {
1553 struct sock *sk = sock->sk;
1554
1555 write_lock_bh(&sk->sk_callback_lock);
1556
1557 sk->sk_user_data = xprt;
1558 transport->old_data_ready = sk->sk_data_ready;
1559 transport->old_state_change = sk->sk_state_change;
1560 transport->old_write_space = sk->sk_write_space;
1561 sk->sk_data_ready = xs_tcp_data_ready;
1562 sk->sk_state_change = xs_tcp_state_change;
1563 sk->sk_write_space = xs_tcp_write_space;
1564 sk->sk_allocation = GFP_ATOMIC;
1565
1566 /* socket options */
1567 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1568 sock_reset_flag(sk, SOCK_LINGER);
1569 tcp_sk(sk)->linger2 = 0;
1570 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1571
1572 xprt_clear_connected(xprt);
1573
1574 /* Reset to new socket */
1575 transport->sock = sock;
1576 transport->inet = sk;
1577
1578 write_unlock_bh(&sk->sk_callback_lock);
1579 }
1580
1581 /* Tell the socket layer to start connecting... */
1582 xprt->stat.connect_count++;
1583 xprt->stat.connect_start = jiffies;
1584 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1585 }
1586
1587 /**
1588 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1589 * @work: RPC transport to connect
1590 *
1591 * Invoked by a work queue tasklet.
1592 */
1593 static void xs_tcp_connect_worker4(struct work_struct *work)
1594 {
1595 struct sock_xprt *transport =
1596 container_of(work, struct sock_xprt, connect_worker.work);
1597 struct rpc_xprt *xprt = &transport->xprt;
1598 struct socket *sock = transport->sock;
1599 int err, status = -EIO;
1600
1601 if (xprt->shutdown || !xprt_bound(xprt))
1602 goto out;
1603
1604 if (!sock) {
1605 /* start from scratch */
1606 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1607 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1608 goto out;
1609 }
1610 xs_reclassify_socket4(sock);
1611
1612 if (xs_bind4(transport, sock) < 0) {
1613 sock_release(sock);
1614 goto out;
1615 }
1616 } else
1617 /* "close" the socket, preserving the local port */
1618 xs_tcp_reuse_connection(xprt);
1619
1620 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1621 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1622
1623 status = xs_tcp_finish_connecting(xprt, sock);
1624 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1625 xprt, -status, xprt_connected(xprt),
1626 sock->sk->sk_state);
1627 if (status < 0) {
1628 switch (status) {
1629 case -EINPROGRESS:
1630 case -EALREADY:
1631 goto out_clear;
1632 case -ECONNREFUSED:
1633 case -ECONNRESET:
1634 /* retry with existing socket, after a delay */
1635 break;
1636 default:
1637 /* get rid of existing socket, and retry */
1638 xs_close(xprt);
1639 break;
1640 }
1641 }
1642 out:
1643 xprt_wake_pending_tasks(xprt, status);
1644 out_clear:
1645 xprt_clear_connecting(xprt);
1646 }
1647
1648 /**
1649 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1650 * @work: RPC transport to connect
1651 *
1652 * Invoked by a work queue tasklet.
1653 */
1654 static void xs_tcp_connect_worker6(struct work_struct *work)
1655 {
1656 struct sock_xprt *transport =
1657 container_of(work, struct sock_xprt, connect_worker.work);
1658 struct rpc_xprt *xprt = &transport->xprt;
1659 struct socket *sock = transport->sock;
1660 int err, status = -EIO;
1661
1662 if (xprt->shutdown || !xprt_bound(xprt))
1663 goto out;
1664
1665 if (!sock) {
1666 /* start from scratch */
1667 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1668 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1669 goto out;
1670 }
1671 xs_reclassify_socket6(sock);
1672
1673 if (xs_bind6(transport, sock) < 0) {
1674 sock_release(sock);
1675 goto out;
1676 }
1677 } else
1678 /* "close" the socket, preserving the local port */
1679 xs_tcp_reuse_connection(xprt);
1680
1681 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1682 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1683
1684 status = xs_tcp_finish_connecting(xprt, sock);
1685 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1686 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1687 if (status < 0) {
1688 switch (status) {
1689 case -EINPROGRESS:
1690 case -EALREADY:
1691 goto out_clear;
1692 case -ECONNREFUSED:
1693 case -ECONNRESET:
1694 /* retry with existing socket, after a delay */
1695 break;
1696 default:
1697 /* get rid of existing socket, and retry */
1698 xs_close(xprt);
1699 break;
1700 }
1701 }
1702 out:
1703 xprt_wake_pending_tasks(xprt, status);
1704 out_clear:
1705 xprt_clear_connecting(xprt);
1706 }
1707
1708 /**
1709 * xs_connect - connect a socket to a remote endpoint
1710 * @task: address of RPC task that manages state of connect request
1711 *
1712 * TCP: If the remote end dropped the connection, delay reconnecting.
1713 *
1714 * UDP socket connects are synchronous, but we use a work queue anyway
1715 * to guarantee that even unprivileged user processes can set up a
1716 * socket on a privileged port.
1717 *
1718 * If a UDP socket connect fails, the delay behavior here prevents
1719 * retry floods (hard mounts).
1720 */
1721 static void xs_connect(struct rpc_task *task)
1722 {
1723 struct rpc_xprt *xprt = task->tk_xprt;
1724 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1725
1726 if (xprt_test_and_set_connecting(xprt))
1727 return;
1728
1729 if (transport->sock != NULL) {
1730 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1731 "seconds\n",
1732 xprt, xprt->reestablish_timeout / HZ);
1733 queue_delayed_work(rpciod_workqueue,
1734 &transport->connect_worker,
1735 xprt->reestablish_timeout);
1736 xprt->reestablish_timeout <<= 1;
1737 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1738 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1739 } else {
1740 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1741 queue_delayed_work(rpciod_workqueue,
1742 &transport->connect_worker, 0);
1743 }
1744 }
1745
1746 /**
1747 * xs_udp_print_stats - display UDP socket-specifc stats
1748 * @xprt: rpc_xprt struct containing statistics
1749 * @seq: output file
1750 *
1751 */
1752 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1753 {
1754 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1755
1756 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1757 transport->port,
1758 xprt->stat.bind_count,
1759 xprt->stat.sends,
1760 xprt->stat.recvs,
1761 xprt->stat.bad_xids,
1762 xprt->stat.req_u,
1763 xprt->stat.bklog_u);
1764 }
1765
1766 /**
1767 * xs_tcp_print_stats - display TCP socket-specifc stats
1768 * @xprt: rpc_xprt struct containing statistics
1769 * @seq: output file
1770 *
1771 */
1772 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1773 {
1774 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1775 long idle_time = 0;
1776
1777 if (xprt_connected(xprt))
1778 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1779
1780 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1781 transport->port,
1782 xprt->stat.bind_count,
1783 xprt->stat.connect_count,
1784 xprt->stat.connect_time,
1785 idle_time,
1786 xprt->stat.sends,
1787 xprt->stat.recvs,
1788 xprt->stat.bad_xids,
1789 xprt->stat.req_u,
1790 xprt->stat.bklog_u);
1791 }
1792
1793 static struct rpc_xprt_ops xs_udp_ops = {
1794 .set_buffer_size = xs_udp_set_buffer_size,
1795 .reserve_xprt = xprt_reserve_xprt_cong,
1796 .release_xprt = xprt_release_xprt_cong,
1797 .rpcbind = rpcb_getport_async,
1798 .set_port = xs_set_port,
1799 .connect = xs_connect,
1800 .buf_alloc = rpc_malloc,
1801 .buf_free = rpc_free,
1802 .send_request = xs_udp_send_request,
1803 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1804 .timer = xs_udp_timer,
1805 .release_request = xprt_release_rqst_cong,
1806 .close = xs_close,
1807 .destroy = xs_destroy,
1808 .print_stats = xs_udp_print_stats,
1809 };
1810
1811 static struct rpc_xprt_ops xs_tcp_ops = {
1812 .reserve_xprt = xprt_reserve_xprt,
1813 .release_xprt = xs_tcp_release_xprt,
1814 .rpcbind = rpcb_getport_async,
1815 .set_port = xs_set_port,
1816 .connect = xs_connect,
1817 .buf_alloc = rpc_malloc,
1818 .buf_free = rpc_free,
1819 .send_request = xs_tcp_send_request,
1820 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1821 .close = xs_close,
1822 .destroy = xs_destroy,
1823 .print_stats = xs_tcp_print_stats,
1824 };
1825
1826 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1827 unsigned int slot_table_size)
1828 {
1829 struct rpc_xprt *xprt;
1830 struct sock_xprt *new;
1831
1832 if (args->addrlen > sizeof(xprt->addr)) {
1833 dprintk("RPC: xs_setup_xprt: address too large\n");
1834 return ERR_PTR(-EBADF);
1835 }
1836
1837 new = kzalloc(sizeof(*new), GFP_KERNEL);
1838 if (new == NULL) {
1839 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1840 "rpc_xprt\n");
1841 return ERR_PTR(-ENOMEM);
1842 }
1843 xprt = &new->xprt;
1844
1845 xprt->max_reqs = slot_table_size;
1846 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1847 if (xprt->slot == NULL) {
1848 kfree(xprt);
1849 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1850 "table\n");
1851 return ERR_PTR(-ENOMEM);
1852 }
1853
1854 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1855 xprt->addrlen = args->addrlen;
1856 if (args->srcaddr)
1857 memcpy(&new->addr, args->srcaddr, args->addrlen);
1858
1859 return xprt;
1860 }
1861
1862 /**
1863 * xs_setup_udp - Set up transport to use a UDP socket
1864 * @args: rpc transport creation arguments
1865 *
1866 */
1867 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1868 {
1869 struct sockaddr *addr = args->dstaddr;
1870 struct rpc_xprt *xprt;
1871 struct sock_xprt *transport;
1872
1873 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1874 if (IS_ERR(xprt))
1875 return xprt;
1876 transport = container_of(xprt, struct sock_xprt, xprt);
1877
1878 xprt->prot = IPPROTO_UDP;
1879 xprt->tsh_size = 0;
1880 /* XXX: header size can vary due to auth type, IPv6, etc. */
1881 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1882
1883 xprt->bind_timeout = XS_BIND_TO;
1884 xprt->connect_timeout = XS_UDP_CONN_TO;
1885 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1886 xprt->idle_timeout = XS_IDLE_DISC_TO;
1887
1888 xprt->ops = &xs_udp_ops;
1889
1890 if (args->timeout)
1891 xprt->timeout = *args->timeout;
1892 else
1893 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1894
1895 switch (addr->sa_family) {
1896 case AF_INET:
1897 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1898 xprt_set_bound(xprt);
1899
1900 INIT_DELAYED_WORK(&transport->connect_worker,
1901 xs_udp_connect_worker4);
1902 xs_format_ipv4_peer_addresses(xprt);
1903 break;
1904 case AF_INET6:
1905 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1906 xprt_set_bound(xprt);
1907
1908 INIT_DELAYED_WORK(&transport->connect_worker,
1909 xs_udp_connect_worker6);
1910 xs_format_ipv6_peer_addresses(xprt);
1911 break;
1912 default:
1913 kfree(xprt);
1914 return ERR_PTR(-EAFNOSUPPORT);
1915 }
1916
1917 dprintk("RPC: set up transport to address %s\n",
1918 xprt->address_strings[RPC_DISPLAY_ALL]);
1919
1920 if (try_module_get(THIS_MODULE))
1921 return xprt;
1922
1923 kfree(xprt->slot);
1924 kfree(xprt);
1925 return ERR_PTR(-EINVAL);
1926 }
1927
1928 /**
1929 * xs_setup_tcp - Set up transport to use a TCP socket
1930 * @args: rpc transport creation arguments
1931 *
1932 */
1933 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1934 {
1935 struct sockaddr *addr = args->dstaddr;
1936 struct rpc_xprt *xprt;
1937 struct sock_xprt *transport;
1938
1939 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1940 if (IS_ERR(xprt))
1941 return xprt;
1942 transport = container_of(xprt, struct sock_xprt, xprt);
1943
1944 xprt->prot = IPPROTO_TCP;
1945 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1946 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1947
1948 xprt->bind_timeout = XS_BIND_TO;
1949 xprt->connect_timeout = XS_TCP_CONN_TO;
1950 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1951 xprt->idle_timeout = XS_IDLE_DISC_TO;
1952
1953 xprt->ops = &xs_tcp_ops;
1954
1955 if (args->timeout)
1956 xprt->timeout = *args->timeout;
1957 else
1958 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1959
1960 switch (addr->sa_family) {
1961 case AF_INET:
1962 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1963 xprt_set_bound(xprt);
1964
1965 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1966 xs_format_ipv4_peer_addresses(xprt);
1967 break;
1968 case AF_INET6:
1969 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1970 xprt_set_bound(xprt);
1971
1972 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
1973 xs_format_ipv6_peer_addresses(xprt);
1974 break;
1975 default:
1976 kfree(xprt);
1977 return ERR_PTR(-EAFNOSUPPORT);
1978 }
1979
1980 dprintk("RPC: set up transport to address %s\n",
1981 xprt->address_strings[RPC_DISPLAY_ALL]);
1982
1983 if (try_module_get(THIS_MODULE))
1984 return xprt;
1985
1986 kfree(xprt->slot);
1987 kfree(xprt);
1988 return ERR_PTR(-EINVAL);
1989 }
1990
1991 static struct xprt_class xs_udp_transport = {
1992 .list = LIST_HEAD_INIT(xs_udp_transport.list),
1993 .name = "udp",
1994 .owner = THIS_MODULE,
1995 .ident = IPPROTO_UDP,
1996 .setup = xs_setup_udp,
1997 };
1998
1999 static struct xprt_class xs_tcp_transport = {
2000 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2001 .name = "tcp",
2002 .owner = THIS_MODULE,
2003 .ident = IPPROTO_TCP,
2004 .setup = xs_setup_tcp,
2005 };
2006
2007 /**
2008 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2009 *
2010 */
2011 int init_socket_xprt(void)
2012 {
2013 #ifdef RPC_DEBUG
2014 if (!sunrpc_table_header)
2015 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2016 #endif
2017
2018 xprt_register_transport(&xs_udp_transport);
2019 xprt_register_transport(&xs_tcp_transport);
2020
2021 return 0;
2022 }
2023
2024 /**
2025 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2026 *
2027 */
2028 void cleanup_socket_xprt(void)
2029 {
2030 #ifdef RPC_DEBUG
2031 if (sunrpc_table_header) {
2032 unregister_sysctl_table(sunrpc_table_header);
2033 sunrpc_table_header = NULL;
2034 }
2035 #endif
2036
2037 xprt_unregister_transport(&xs_udp_transport);
2038 xprt_unregister_transport(&xs_tcp_transport);
2039 }