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