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SUNRPC: Ensure we set XPRT_CLOSING only after we've sent a tcp FIN...
[mirror_ubuntu-bionic-kernel.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * Time out for an RPC UDP socket connect. UDP socket connects are
140 * synchronous, but we set a timeout anyway in case of resource
141 * exhaustion on the local host.
142 */
143 #define XS_UDP_CONN_TO (5U * HZ)
144
145 /*
146 * Wait duration for an RPC TCP connection to be established. Solaris
147 * NFS over TCP uses 60 seconds, for example, which is in line with how
148 * long a server takes to reboot.
149 */
150 #define XS_TCP_CONN_TO (60U * HZ)
151
152 /*
153 * Wait duration for a reply from the RPC portmapper.
154 */
155 #define XS_BIND_TO (60U * HZ)
156
157 /*
158 * Delay if a UDP socket connect error occurs. This is most likely some
159 * kind of resource problem on the local host.
160 */
161 #define XS_UDP_REEST_TO (2U * HZ)
162
163 /*
164 * The reestablish timeout allows clients to delay for a bit before attempting
165 * to reconnect to a server that just dropped our connection.
166 *
167 * We implement an exponential backoff when trying to reestablish a TCP
168 * transport connection with the server. Some servers like to drop a TCP
169 * connection when they are overworked, so we start with a short timeout and
170 * increase over time if the server is down or not responding.
171 */
172 #define XS_TCP_INIT_REEST_TO (3U * HZ)
173 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
174
175 /*
176 * TCP idle timeout; client drops the transport socket if it is idle
177 * for this long. Note that we also timeout UDP sockets to prevent
178 * holding port numbers when there is no RPC traffic.
179 */
180 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
181
182 #ifdef RPC_DEBUG
183 # undef RPC_DEBUG_DATA
184 # define RPCDBG_FACILITY RPCDBG_TRANS
185 #endif
186
187 #ifdef RPC_DEBUG_DATA
188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
189 {
190 u8 *buf = (u8 *) packet;
191 int j;
192
193 dprintk("RPC: %s\n", msg);
194 for (j = 0; j < count && j < 128; j += 4) {
195 if (!(j & 31)) {
196 if (j)
197 dprintk("\n");
198 dprintk("0x%04x ", j);
199 }
200 dprintk("%02x%02x%02x%02x ",
201 buf[j], buf[j+1], buf[j+2], buf[j+3]);
202 }
203 dprintk("\n");
204 }
205 #else
206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207 {
208 /* NOP */
209 }
210 #endif
211
212 struct sock_xprt {
213 struct rpc_xprt xprt;
214
215 /*
216 * Network layer
217 */
218 struct socket * sock;
219 struct sock * inet;
220
221 /*
222 * State of TCP reply receive
223 */
224 __be32 tcp_fraghdr,
225 tcp_xid;
226
227 u32 tcp_offset,
228 tcp_reclen;
229
230 unsigned long tcp_copied,
231 tcp_flags;
232
233 /*
234 * Connection of transports
235 */
236 struct delayed_work connect_worker;
237 struct sockaddr_storage addr;
238 unsigned short port;
239
240 /*
241 * UDP socket buffer size parameters
242 */
243 size_t rcvsize,
244 sndsize;
245
246 /*
247 * Saved socket callback addresses
248 */
249 void (*old_data_ready)(struct sock *, int);
250 void (*old_state_change)(struct sock *);
251 void (*old_write_space)(struct sock *);
252 void (*old_error_report)(struct sock *);
253 };
254
255 /*
256 * TCP receive state flags
257 */
258 #define TCP_RCV_LAST_FRAG (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
260 #define TCP_RCV_COPY_XID (1UL << 2)
261 #define TCP_RCV_COPY_DATA (1UL << 3)
262
263 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
264 {
265 return (struct sockaddr *) &xprt->addr;
266 }
267
268 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr_in *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in6 *) &xprt->addr;
276 }
277
278 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
279 const char *protocol,
280 const char *netid)
281 {
282 struct sockaddr_in *addr = xs_addr_in(xprt);
283 char *buf;
284
285 buf = kzalloc(20, GFP_KERNEL);
286 if (buf) {
287 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
288 }
289 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
290
291 buf = kzalloc(8, GFP_KERNEL);
292 if (buf) {
293 snprintf(buf, 8, "%u",
294 ntohs(addr->sin_port));
295 }
296 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
297
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299
300 buf = kzalloc(48, GFP_KERNEL);
301 if (buf) {
302 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
303 &addr->sin_addr.s_addr,
304 ntohs(addr->sin_port),
305 protocol);
306 }
307 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
308
309 buf = kzalloc(10, GFP_KERNEL);
310 if (buf) {
311 snprintf(buf, 10, "%02x%02x%02x%02x",
312 NIPQUAD(addr->sin_addr.s_addr));
313 }
314 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
315
316 buf = kzalloc(8, GFP_KERNEL);
317 if (buf) {
318 snprintf(buf, 8, "%4hx",
319 ntohs(addr->sin_port));
320 }
321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
322
323 buf = kzalloc(30, GFP_KERNEL);
324 if (buf) {
325 snprintf(buf, 30, "%pI4.%u.%u",
326 &addr->sin_addr.s_addr,
327 ntohs(addr->sin_port) >> 8,
328 ntohs(addr->sin_port) & 0xff);
329 }
330 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
331
332 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
333 }
334
335 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
336 const char *protocol,
337 const char *netid)
338 {
339 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
340 char *buf;
341
342 buf = kzalloc(40, GFP_KERNEL);
343 if (buf) {
344 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
345 }
346 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
347
348 buf = kzalloc(8, GFP_KERNEL);
349 if (buf) {
350 snprintf(buf, 8, "%u",
351 ntohs(addr->sin6_port));
352 }
353 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
354
355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356
357 buf = kzalloc(64, GFP_KERNEL);
358 if (buf) {
359 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
360 &addr->sin6_addr,
361 ntohs(addr->sin6_port),
362 protocol);
363 }
364 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
365
366 buf = kzalloc(36, GFP_KERNEL);
367 if (buf)
368 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
369
370 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
371
372 buf = kzalloc(8, GFP_KERNEL);
373 if (buf) {
374 snprintf(buf, 8, "%4hx",
375 ntohs(addr->sin6_port));
376 }
377 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
378
379 buf = kzalloc(50, GFP_KERNEL);
380 if (buf) {
381 snprintf(buf, 50, "%pI6.%u.%u",
382 &addr->sin6_addr,
383 ntohs(addr->sin6_port) >> 8,
384 ntohs(addr->sin6_port) & 0xff);
385 }
386 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
387
388 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
389 }
390
391 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
392 {
393 unsigned int i;
394
395 for (i = 0; i < RPC_DISPLAY_MAX; i++)
396 switch (i) {
397 case RPC_DISPLAY_PROTO:
398 case RPC_DISPLAY_NETID:
399 continue;
400 default:
401 kfree(xprt->address_strings[i]);
402 }
403 }
404
405 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
406
407 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
408 {
409 struct msghdr msg = {
410 .msg_name = addr,
411 .msg_namelen = addrlen,
412 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
413 };
414 struct kvec iov = {
415 .iov_base = vec->iov_base + base,
416 .iov_len = vec->iov_len - base,
417 };
418
419 if (iov.iov_len != 0)
420 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
421 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
422 }
423
424 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
425 {
426 struct page **ppage;
427 unsigned int remainder;
428 int err, sent = 0;
429
430 remainder = xdr->page_len - base;
431 base += xdr->page_base;
432 ppage = xdr->pages + (base >> PAGE_SHIFT);
433 base &= ~PAGE_MASK;
434 for(;;) {
435 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
436 int flags = XS_SENDMSG_FLAGS;
437
438 remainder -= len;
439 if (remainder != 0 || more)
440 flags |= MSG_MORE;
441 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
442 if (remainder == 0 || err != len)
443 break;
444 sent += err;
445 ppage++;
446 base = 0;
447 }
448 if (sent == 0)
449 return err;
450 if (err > 0)
451 sent += err;
452 return sent;
453 }
454
455 /**
456 * xs_sendpages - write pages directly to a socket
457 * @sock: socket to send on
458 * @addr: UDP only -- address of destination
459 * @addrlen: UDP only -- length of destination address
460 * @xdr: buffer containing this request
461 * @base: starting position in the buffer
462 *
463 */
464 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
465 {
466 unsigned int remainder = xdr->len - base;
467 int err, sent = 0;
468
469 if (unlikely(!sock))
470 return -ENOTSOCK;
471
472 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
473 if (base != 0) {
474 addr = NULL;
475 addrlen = 0;
476 }
477
478 if (base < xdr->head[0].iov_len || addr != NULL) {
479 unsigned int len = xdr->head[0].iov_len - base;
480 remainder -= len;
481 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
482 if (remainder == 0 || err != len)
483 goto out;
484 sent += err;
485 base = 0;
486 } else
487 base -= xdr->head[0].iov_len;
488
489 if (base < xdr->page_len) {
490 unsigned int len = xdr->page_len - base;
491 remainder -= len;
492 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
493 if (remainder == 0 || err != len)
494 goto out;
495 sent += err;
496 base = 0;
497 } else
498 base -= xdr->page_len;
499
500 if (base >= xdr->tail[0].iov_len)
501 return sent;
502 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
503 out:
504 if (sent == 0)
505 return err;
506 if (err > 0)
507 sent += err;
508 return sent;
509 }
510
511 static void xs_nospace_callback(struct rpc_task *task)
512 {
513 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
514
515 transport->inet->sk_write_pending--;
516 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
517 }
518
519 /**
520 * xs_nospace - place task on wait queue if transmit was incomplete
521 * @task: task to put to sleep
522 *
523 */
524 static void xs_nospace(struct rpc_task *task)
525 {
526 struct rpc_rqst *req = task->tk_rqstp;
527 struct rpc_xprt *xprt = req->rq_xprt;
528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
529
530 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
531 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
532 req->rq_slen);
533
534 /* Protect against races with write_space */
535 spin_lock_bh(&xprt->transport_lock);
536
537 /* Don't race with disconnect */
538 if (xprt_connected(xprt)) {
539 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
540 /*
541 * Notify TCP that we're limited by the application
542 * window size
543 */
544 set_bit(SOCK_NOSPACE, &transport->sock->flags);
545 transport->inet->sk_write_pending++;
546 /* ...and wait for more buffer space */
547 xprt_wait_for_buffer_space(task, xs_nospace_callback);
548 }
549 } else {
550 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
551 task->tk_status = -ENOTCONN;
552 }
553
554 spin_unlock_bh(&xprt->transport_lock);
555 }
556
557 /**
558 * xs_udp_send_request - write an RPC request to a UDP socket
559 * @task: address of RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568 static int xs_udp_send_request(struct rpc_task *task)
569 {
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
573 struct xdr_buf *xdr = &req->rq_snd_buf;
574 int status;
575
576 xs_pktdump("packet data:",
577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
580 if (!xprt_bound(xprt))
581 return -ENOTCONN;
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 -ENOTSOCK:
600 status = -ENOTCONN;
601 /* Should we call xs_close() here? */
602 break;
603 case -EAGAIN:
604 xs_nospace(task);
605 break;
606 case -ENETUNREACH:
607 case -EPIPE:
608 case -ECONNREFUSED:
609 /* When the server has died, an ICMP port unreachable message
610 * prompts ECONNREFUSED. */
611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
612 break;
613 default:
614 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
615 dprintk("RPC: sendmsg returned unrecognized error %d\n",
616 -status);
617 }
618
619 return status;
620 }
621
622 /**
623 * xs_tcp_shutdown - gracefully shut down a TCP socket
624 * @xprt: transport
625 *
626 * Initiates a graceful shutdown of the TCP socket by calling the
627 * equivalent of shutdown(SHUT_WR);
628 */
629 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
630 {
631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
632 struct socket *sock = transport->sock;
633
634 if (sock != NULL)
635 kernel_sock_shutdown(sock, SHUT_WR);
636 }
637
638 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
639 {
640 u32 reclen = buf->len - sizeof(rpc_fraghdr);
641 rpc_fraghdr *base = buf->head[0].iov_base;
642 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
643 }
644
645 /**
646 * xs_tcp_send_request - write an RPC request to a TCP socket
647 * @task: address of RPC task that manages the state of an RPC request
648 *
649 * Return values:
650 * 0: The request has been sent
651 * EAGAIN: The socket was blocked, please call again later to
652 * complete the request
653 * ENOTCONN: Caller needs to invoke connect logic then call again
654 * other: Some other error occured, the request was not sent
655 *
656 * XXX: In the case of soft timeouts, should we eventually give up
657 * if sendmsg is not able to make progress?
658 */
659 static int xs_tcp_send_request(struct rpc_task *task)
660 {
661 struct rpc_rqst *req = task->tk_rqstp;
662 struct rpc_xprt *xprt = req->rq_xprt;
663 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
664 struct xdr_buf *xdr = &req->rq_snd_buf;
665 int status;
666
667 xs_encode_tcp_record_marker(&req->rq_snd_buf);
668
669 xs_pktdump("packet data:",
670 req->rq_svec->iov_base,
671 req->rq_svec->iov_len);
672
673 /* Continue transmitting the packet/record. We must be careful
674 * to cope with writespace callbacks arriving _after_ we have
675 * called sendmsg(). */
676 while (1) {
677 status = xs_sendpages(transport->sock,
678 NULL, 0, xdr, req->rq_bytes_sent);
679
680 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
681 xdr->len - req->rq_bytes_sent, status);
682
683 if (unlikely(status < 0))
684 break;
685
686 /* If we've sent the entire packet, immediately
687 * reset the count of bytes sent. */
688 req->rq_bytes_sent += status;
689 task->tk_bytes_sent += status;
690 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
691 req->rq_bytes_sent = 0;
692 return 0;
693 }
694
695 if (status != 0)
696 continue;
697 status = -EAGAIN;
698 break;
699 }
700
701 switch (status) {
702 case -ENOTSOCK:
703 status = -ENOTCONN;
704 /* Should we call xs_close() here? */
705 break;
706 case -EAGAIN:
707 xs_nospace(task);
708 break;
709 case -ECONNRESET:
710 xs_tcp_shutdown(xprt);
711 case -ECONNREFUSED:
712 case -ENOTCONN:
713 case -EPIPE:
714 status = -ENOTCONN;
715 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
716 break;
717 default:
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
719 -status);
720 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
721 xs_tcp_shutdown(xprt);
722 }
723
724 return status;
725 }
726
727 /**
728 * xs_tcp_release_xprt - clean up after a tcp transmission
729 * @xprt: transport
730 * @task: rpc task
731 *
732 * This cleans up if an error causes us to abort the transmission of a request.
733 * In this case, the socket may need to be reset in order to avoid confusing
734 * the server.
735 */
736 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
737 {
738 struct rpc_rqst *req;
739
740 if (task != xprt->snd_task)
741 return;
742 if (task == NULL)
743 goto out_release;
744 req = task->tk_rqstp;
745 if (req->rq_bytes_sent == 0)
746 goto out_release;
747 if (req->rq_bytes_sent == req->rq_snd_buf.len)
748 goto out_release;
749 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
750 out_release:
751 xprt_release_xprt(xprt, task);
752 }
753
754 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
755 {
756 transport->old_data_ready = sk->sk_data_ready;
757 transport->old_state_change = sk->sk_state_change;
758 transport->old_write_space = sk->sk_write_space;
759 transport->old_error_report = sk->sk_error_report;
760 }
761
762 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
763 {
764 sk->sk_data_ready = transport->old_data_ready;
765 sk->sk_state_change = transport->old_state_change;
766 sk->sk_write_space = transport->old_write_space;
767 sk->sk_error_report = transport->old_error_report;
768 }
769
770 static void xs_reset_transport(struct sock_xprt *transport)
771 {
772 struct socket *sock = transport->sock;
773 struct sock *sk = transport->inet;
774
775 if (sk == NULL)
776 return;
777
778 write_lock_bh(&sk->sk_callback_lock);
779 transport->inet = NULL;
780 transport->sock = NULL;
781
782 sk->sk_user_data = NULL;
783
784 xs_restore_old_callbacks(transport, sk);
785 write_unlock_bh(&sk->sk_callback_lock);
786
787 sk->sk_no_check = 0;
788
789 sock_release(sock);
790 }
791
792 /**
793 * xs_close - close a socket
794 * @xprt: transport
795 *
796 * This is used when all requests are complete; ie, no DRC state remains
797 * on the server we want to save.
798 */
799 static void xs_close(struct rpc_xprt *xprt)
800 {
801 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
802
803 dprintk("RPC: xs_close xprt %p\n", xprt);
804
805 xs_reset_transport(transport);
806
807 smp_mb__before_clear_bit();
808 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
809 clear_bit(XPRT_CLOSING, &xprt->state);
810 smp_mb__after_clear_bit();
811 xprt_disconnect_done(xprt);
812 }
813
814 /**
815 * xs_destroy - prepare to shutdown a transport
816 * @xprt: doomed transport
817 *
818 */
819 static void xs_destroy(struct rpc_xprt *xprt)
820 {
821 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
822
823 dprintk("RPC: xs_destroy xprt %p\n", xprt);
824
825 cancel_rearming_delayed_work(&transport->connect_worker);
826
827 xs_close(xprt);
828 xs_free_peer_addresses(xprt);
829 kfree(xprt->slot);
830 kfree(xprt);
831 module_put(THIS_MODULE);
832 }
833
834 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
835 {
836 return (struct rpc_xprt *) sk->sk_user_data;
837 }
838
839 /**
840 * xs_udp_data_ready - "data ready" callback for UDP sockets
841 * @sk: socket with data to read
842 * @len: how much data to read
843 *
844 */
845 static void xs_udp_data_ready(struct sock *sk, int len)
846 {
847 struct rpc_task *task;
848 struct rpc_xprt *xprt;
849 struct rpc_rqst *rovr;
850 struct sk_buff *skb;
851 int err, repsize, copied;
852 u32 _xid;
853 __be32 *xp;
854
855 read_lock(&sk->sk_callback_lock);
856 dprintk("RPC: xs_udp_data_ready...\n");
857 if (!(xprt = xprt_from_sock(sk)))
858 goto out;
859
860 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
861 goto out;
862
863 if (xprt->shutdown)
864 goto dropit;
865
866 repsize = skb->len - sizeof(struct udphdr);
867 if (repsize < 4) {
868 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
869 goto dropit;
870 }
871
872 /* Copy the XID from the skb... */
873 xp = skb_header_pointer(skb, sizeof(struct udphdr),
874 sizeof(_xid), &_xid);
875 if (xp == NULL)
876 goto dropit;
877
878 /* Look up and lock the request corresponding to the given XID */
879 spin_lock(&xprt->transport_lock);
880 rovr = xprt_lookup_rqst(xprt, *xp);
881 if (!rovr)
882 goto out_unlock;
883 task = rovr->rq_task;
884
885 if ((copied = rovr->rq_private_buf.buflen) > repsize)
886 copied = repsize;
887
888 /* Suck it into the iovec, verify checksum if not done by hw. */
889 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
890 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
891 goto out_unlock;
892 }
893
894 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
895
896 /* Something worked... */
897 dst_confirm(skb->dst);
898
899 xprt_adjust_cwnd(task, copied);
900 xprt_update_rtt(task);
901 xprt_complete_rqst(task, copied);
902
903 out_unlock:
904 spin_unlock(&xprt->transport_lock);
905 dropit:
906 skb_free_datagram(sk, skb);
907 out:
908 read_unlock(&sk->sk_callback_lock);
909 }
910
911 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
912 {
913 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
914 size_t len, used;
915 char *p;
916
917 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
918 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
919 used = xdr_skb_read_bits(desc, p, len);
920 transport->tcp_offset += used;
921 if (used != len)
922 return;
923
924 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
925 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
926 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
927 else
928 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
929 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
930
931 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
932 transport->tcp_offset = 0;
933
934 /* Sanity check of the record length */
935 if (unlikely(transport->tcp_reclen < 4)) {
936 dprintk("RPC: invalid TCP record fragment length\n");
937 xprt_force_disconnect(xprt);
938 return;
939 }
940 dprintk("RPC: reading TCP record fragment of length %d\n",
941 transport->tcp_reclen);
942 }
943
944 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
945 {
946 if (transport->tcp_offset == transport->tcp_reclen) {
947 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
948 transport->tcp_offset = 0;
949 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
950 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
951 transport->tcp_flags |= TCP_RCV_COPY_XID;
952 transport->tcp_copied = 0;
953 }
954 }
955 }
956
957 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
958 {
959 size_t len, used;
960 char *p;
961
962 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
963 dprintk("RPC: reading XID (%Zu bytes)\n", len);
964 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
965 used = xdr_skb_read_bits(desc, p, len);
966 transport->tcp_offset += used;
967 if (used != len)
968 return;
969 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
970 transport->tcp_flags |= TCP_RCV_COPY_DATA;
971 transport->tcp_copied = 4;
972 dprintk("RPC: reading reply for XID %08x\n",
973 ntohl(transport->tcp_xid));
974 xs_tcp_check_fraghdr(transport);
975 }
976
977 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
978 {
979 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
980 struct rpc_rqst *req;
981 struct xdr_buf *rcvbuf;
982 size_t len;
983 ssize_t r;
984
985 /* Find and lock the request corresponding to this xid */
986 spin_lock(&xprt->transport_lock);
987 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
988 if (!req) {
989 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
990 dprintk("RPC: XID %08x request not found!\n",
991 ntohl(transport->tcp_xid));
992 spin_unlock(&xprt->transport_lock);
993 return;
994 }
995
996 rcvbuf = &req->rq_private_buf;
997 len = desc->count;
998 if (len > transport->tcp_reclen - transport->tcp_offset) {
999 struct xdr_skb_reader my_desc;
1000
1001 len = transport->tcp_reclen - transport->tcp_offset;
1002 memcpy(&my_desc, desc, sizeof(my_desc));
1003 my_desc.count = len;
1004 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1005 &my_desc, xdr_skb_read_bits);
1006 desc->count -= r;
1007 desc->offset += r;
1008 } else
1009 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1010 desc, xdr_skb_read_bits);
1011
1012 if (r > 0) {
1013 transport->tcp_copied += r;
1014 transport->tcp_offset += r;
1015 }
1016 if (r != len) {
1017 /* Error when copying to the receive buffer,
1018 * usually because we weren't able to allocate
1019 * additional buffer pages. All we can do now
1020 * is turn off TCP_RCV_COPY_DATA, so the request
1021 * will not receive any additional updates,
1022 * and time out.
1023 * Any remaining data from this record will
1024 * be discarded.
1025 */
1026 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1027 dprintk("RPC: XID %08x truncated request\n",
1028 ntohl(transport->tcp_xid));
1029 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1030 "tcp_offset = %u, tcp_reclen = %u\n",
1031 xprt, transport->tcp_copied,
1032 transport->tcp_offset, transport->tcp_reclen);
1033 goto out;
1034 }
1035
1036 dprintk("RPC: XID %08x read %Zd bytes\n",
1037 ntohl(transport->tcp_xid), r);
1038 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1039 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1040 transport->tcp_offset, transport->tcp_reclen);
1041
1042 if (transport->tcp_copied == req->rq_private_buf.buflen)
1043 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1044 else if (transport->tcp_offset == transport->tcp_reclen) {
1045 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1046 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1047 }
1048
1049 out:
1050 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1051 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1052 spin_unlock(&xprt->transport_lock);
1053 xs_tcp_check_fraghdr(transport);
1054 }
1055
1056 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1057 {
1058 size_t len;
1059
1060 len = transport->tcp_reclen - transport->tcp_offset;
1061 if (len > desc->count)
1062 len = desc->count;
1063 desc->count -= len;
1064 desc->offset += len;
1065 transport->tcp_offset += len;
1066 dprintk("RPC: discarded %Zu bytes\n", len);
1067 xs_tcp_check_fraghdr(transport);
1068 }
1069
1070 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1071 {
1072 struct rpc_xprt *xprt = rd_desc->arg.data;
1073 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1074 struct xdr_skb_reader desc = {
1075 .skb = skb,
1076 .offset = offset,
1077 .count = len,
1078 };
1079
1080 dprintk("RPC: xs_tcp_data_recv started\n");
1081 do {
1082 /* Read in a new fragment marker if necessary */
1083 /* Can we ever really expect to get completely empty fragments? */
1084 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1085 xs_tcp_read_fraghdr(xprt, &desc);
1086 continue;
1087 }
1088 /* Read in the xid if necessary */
1089 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1090 xs_tcp_read_xid(transport, &desc);
1091 continue;
1092 }
1093 /* Read in the request data */
1094 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1095 xs_tcp_read_request(xprt, &desc);
1096 continue;
1097 }
1098 /* Skip over any trailing bytes on short reads */
1099 xs_tcp_read_discard(transport, &desc);
1100 } while (desc.count);
1101 dprintk("RPC: xs_tcp_data_recv done\n");
1102 return len - desc.count;
1103 }
1104
1105 /**
1106 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1107 * @sk: socket with data to read
1108 * @bytes: how much data to read
1109 *
1110 */
1111 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1112 {
1113 struct rpc_xprt *xprt;
1114 read_descriptor_t rd_desc;
1115 int read;
1116
1117 dprintk("RPC: xs_tcp_data_ready...\n");
1118
1119 read_lock(&sk->sk_callback_lock);
1120 if (!(xprt = xprt_from_sock(sk)))
1121 goto out;
1122 if (xprt->shutdown)
1123 goto out;
1124
1125 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1126 rd_desc.arg.data = xprt;
1127 do {
1128 rd_desc.count = 65536;
1129 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1130 } while (read > 0);
1131 out:
1132 read_unlock(&sk->sk_callback_lock);
1133 }
1134
1135 /**
1136 * xs_tcp_state_change - callback to handle TCP socket state changes
1137 * @sk: socket whose state has changed
1138 *
1139 */
1140 static void xs_tcp_state_change(struct sock *sk)
1141 {
1142 struct rpc_xprt *xprt;
1143
1144 read_lock(&sk->sk_callback_lock);
1145 if (!(xprt = xprt_from_sock(sk)))
1146 goto out;
1147 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1148 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1149 sk->sk_state, xprt_connected(xprt),
1150 sock_flag(sk, SOCK_DEAD),
1151 sock_flag(sk, SOCK_ZAPPED));
1152
1153 switch (sk->sk_state) {
1154 case TCP_ESTABLISHED:
1155 spin_lock_bh(&xprt->transport_lock);
1156 if (!xprt_test_and_set_connected(xprt)) {
1157 struct sock_xprt *transport = container_of(xprt,
1158 struct sock_xprt, xprt);
1159
1160 /* Reset TCP record info */
1161 transport->tcp_offset = 0;
1162 transport->tcp_reclen = 0;
1163 transport->tcp_copied = 0;
1164 transport->tcp_flags =
1165 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1166
1167 xprt_wake_pending_tasks(xprt, 0);
1168 }
1169 spin_unlock_bh(&xprt->transport_lock);
1170 break;
1171 case TCP_FIN_WAIT1:
1172 /* The client initiated a shutdown of the socket */
1173 xprt->connect_cookie++;
1174 xprt->reestablish_timeout = 0;
1175 set_bit(XPRT_CLOSING, &xprt->state);
1176 smp_mb__before_clear_bit();
1177 clear_bit(XPRT_CONNECTED, &xprt->state);
1178 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1179 smp_mb__after_clear_bit();
1180 break;
1181 case TCP_CLOSE_WAIT:
1182 /* The server initiated a shutdown of the socket */
1183 xprt_force_disconnect(xprt);
1184 case TCP_SYN_SENT:
1185 xprt->connect_cookie++;
1186 case TCP_CLOSING:
1187 /*
1188 * If the server closed down the connection, make sure that
1189 * we back off before reconnecting
1190 */
1191 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1192 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1193 break;
1194 case TCP_LAST_ACK:
1195 set_bit(XPRT_CLOSING, &xprt->state);
1196 smp_mb__before_clear_bit();
1197 clear_bit(XPRT_CONNECTED, &xprt->state);
1198 smp_mb__after_clear_bit();
1199 break;
1200 case TCP_CLOSE:
1201 smp_mb__before_clear_bit();
1202 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1203 clear_bit(XPRT_CLOSING, &xprt->state);
1204 smp_mb__after_clear_bit();
1205 /* Mark transport as closed and wake up all pending tasks */
1206 xprt_disconnect_done(xprt);
1207 }
1208 out:
1209 read_unlock(&sk->sk_callback_lock);
1210 }
1211
1212 /**
1213 * xs_tcp_error_report - callback mainly for catching RST events
1214 * @sk: socket
1215 */
1216 static void xs_tcp_error_report(struct sock *sk)
1217 {
1218 struct rpc_xprt *xprt;
1219
1220 read_lock(&sk->sk_callback_lock);
1221 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1222 goto out;
1223 if (!(xprt = xprt_from_sock(sk)))
1224 goto out;
1225 dprintk("RPC: %s client %p...\n"
1226 "RPC: error %d\n",
1227 __func__, xprt, sk->sk_err);
1228
1229 xprt_force_disconnect(xprt);
1230 out:
1231 read_unlock(&sk->sk_callback_lock);
1232 }
1233
1234 /**
1235 * xs_udp_write_space - callback invoked when socket buffer space
1236 * becomes available
1237 * @sk: socket whose state has changed
1238 *
1239 * Called when more output buffer space is available for this socket.
1240 * We try not to wake our writers until they can make "significant"
1241 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1242 * with a bunch of small requests.
1243 */
1244 static void xs_udp_write_space(struct sock *sk)
1245 {
1246 read_lock(&sk->sk_callback_lock);
1247
1248 /* from net/core/sock.c:sock_def_write_space */
1249 if (sock_writeable(sk)) {
1250 struct socket *sock;
1251 struct rpc_xprt *xprt;
1252
1253 if (unlikely(!(sock = sk->sk_socket)))
1254 goto out;
1255 clear_bit(SOCK_NOSPACE, &sock->flags);
1256
1257 if (unlikely(!(xprt = xprt_from_sock(sk))))
1258 goto out;
1259 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1260 goto out;
1261
1262 xprt_write_space(xprt);
1263 }
1264
1265 out:
1266 read_unlock(&sk->sk_callback_lock);
1267 }
1268
1269 /**
1270 * xs_tcp_write_space - callback invoked when socket buffer space
1271 * becomes available
1272 * @sk: socket whose state has changed
1273 *
1274 * Called when more output buffer space is available for this socket.
1275 * We try not to wake our writers until they can make "significant"
1276 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1277 * with a bunch of small requests.
1278 */
1279 static void xs_tcp_write_space(struct sock *sk)
1280 {
1281 read_lock(&sk->sk_callback_lock);
1282
1283 /* from net/core/stream.c:sk_stream_write_space */
1284 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1285 struct socket *sock;
1286 struct rpc_xprt *xprt;
1287
1288 if (unlikely(!(sock = sk->sk_socket)))
1289 goto out;
1290 clear_bit(SOCK_NOSPACE, &sock->flags);
1291
1292 if (unlikely(!(xprt = xprt_from_sock(sk))))
1293 goto out;
1294 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1295 goto out;
1296
1297 xprt_write_space(xprt);
1298 }
1299
1300 out:
1301 read_unlock(&sk->sk_callback_lock);
1302 }
1303
1304 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1305 {
1306 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1307 struct sock *sk = transport->inet;
1308
1309 if (transport->rcvsize) {
1310 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1311 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1312 }
1313 if (transport->sndsize) {
1314 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1315 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1316 sk->sk_write_space(sk);
1317 }
1318 }
1319
1320 /**
1321 * xs_udp_set_buffer_size - set send and receive limits
1322 * @xprt: generic transport
1323 * @sndsize: requested size of send buffer, in bytes
1324 * @rcvsize: requested size of receive buffer, in bytes
1325 *
1326 * Set socket send and receive buffer size limits.
1327 */
1328 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1329 {
1330 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1331
1332 transport->sndsize = 0;
1333 if (sndsize)
1334 transport->sndsize = sndsize + 1024;
1335 transport->rcvsize = 0;
1336 if (rcvsize)
1337 transport->rcvsize = rcvsize + 1024;
1338
1339 xs_udp_do_set_buffer_size(xprt);
1340 }
1341
1342 /**
1343 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1344 * @task: task that timed out
1345 *
1346 * Adjust the congestion window after a retransmit timeout has occurred.
1347 */
1348 static void xs_udp_timer(struct rpc_task *task)
1349 {
1350 xprt_adjust_cwnd(task, -ETIMEDOUT);
1351 }
1352
1353 static unsigned short xs_get_random_port(void)
1354 {
1355 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1356 unsigned short rand = (unsigned short) net_random() % range;
1357 return rand + xprt_min_resvport;
1358 }
1359
1360 /**
1361 * xs_set_port - reset the port number in the remote endpoint address
1362 * @xprt: generic transport
1363 * @port: new port number
1364 *
1365 */
1366 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1367 {
1368 struct sockaddr *addr = xs_addr(xprt);
1369
1370 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1371
1372 switch (addr->sa_family) {
1373 case AF_INET:
1374 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1375 break;
1376 case AF_INET6:
1377 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1378 break;
1379 default:
1380 BUG();
1381 }
1382 }
1383
1384 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1385 {
1386 unsigned short port = transport->port;
1387
1388 if (port == 0 && transport->xprt.resvport)
1389 port = xs_get_random_port();
1390 return port;
1391 }
1392
1393 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1394 {
1395 if (transport->port != 0)
1396 transport->port = 0;
1397 if (!transport->xprt.resvport)
1398 return 0;
1399 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1400 return xprt_max_resvport;
1401 return --port;
1402 }
1403
1404 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1405 {
1406 struct sockaddr_in myaddr = {
1407 .sin_family = AF_INET,
1408 };
1409 struct sockaddr_in *sa;
1410 int err, nloop = 0;
1411 unsigned short port = xs_get_srcport(transport, sock);
1412 unsigned short last;
1413
1414 sa = (struct sockaddr_in *)&transport->addr;
1415 myaddr.sin_addr = sa->sin_addr;
1416 do {
1417 myaddr.sin_port = htons(port);
1418 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1419 sizeof(myaddr));
1420 if (port == 0)
1421 break;
1422 if (err == 0) {
1423 transport->port = port;
1424 break;
1425 }
1426 last = port;
1427 port = xs_next_srcport(transport, sock, port);
1428 if (port > last)
1429 nloop++;
1430 } while (err == -EADDRINUSE && nloop != 2);
1431 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1432 __func__, &myaddr.sin_addr,
1433 port, err ? "failed" : "ok", err);
1434 return err;
1435 }
1436
1437 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1438 {
1439 struct sockaddr_in6 myaddr = {
1440 .sin6_family = AF_INET6,
1441 };
1442 struct sockaddr_in6 *sa;
1443 int err, nloop = 0;
1444 unsigned short port = xs_get_srcport(transport, sock);
1445 unsigned short last;
1446
1447 sa = (struct sockaddr_in6 *)&transport->addr;
1448 myaddr.sin6_addr = sa->sin6_addr;
1449 do {
1450 myaddr.sin6_port = htons(port);
1451 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1452 sizeof(myaddr));
1453 if (port == 0)
1454 break;
1455 if (err == 0) {
1456 transport->port = port;
1457 break;
1458 }
1459 last = port;
1460 port = xs_next_srcport(transport, sock, port);
1461 if (port > last)
1462 nloop++;
1463 } while (err == -EADDRINUSE && nloop != 2);
1464 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1465 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1466 return err;
1467 }
1468
1469 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1470 static struct lock_class_key xs_key[2];
1471 static struct lock_class_key xs_slock_key[2];
1472
1473 static inline void xs_reclassify_socket4(struct socket *sock)
1474 {
1475 struct sock *sk = sock->sk;
1476
1477 BUG_ON(sock_owned_by_user(sk));
1478 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1479 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1480 }
1481
1482 static inline void xs_reclassify_socket6(struct socket *sock)
1483 {
1484 struct sock *sk = sock->sk;
1485
1486 BUG_ON(sock_owned_by_user(sk));
1487 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1488 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1489 }
1490 #else
1491 static inline void xs_reclassify_socket4(struct socket *sock)
1492 {
1493 }
1494
1495 static inline void xs_reclassify_socket6(struct socket *sock)
1496 {
1497 }
1498 #endif
1499
1500 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1501 {
1502 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1503
1504 if (!transport->inet) {
1505 struct sock *sk = sock->sk;
1506
1507 write_lock_bh(&sk->sk_callback_lock);
1508
1509 xs_save_old_callbacks(transport, sk);
1510
1511 sk->sk_user_data = xprt;
1512 sk->sk_data_ready = xs_udp_data_ready;
1513 sk->sk_write_space = xs_udp_write_space;
1514 sk->sk_no_check = UDP_CSUM_NORCV;
1515 sk->sk_allocation = GFP_ATOMIC;
1516
1517 xprt_set_connected(xprt);
1518
1519 /* Reset to new socket */
1520 transport->sock = sock;
1521 transport->inet = sk;
1522
1523 write_unlock_bh(&sk->sk_callback_lock);
1524 }
1525 xs_udp_do_set_buffer_size(xprt);
1526 }
1527
1528 /**
1529 * xs_udp_connect_worker4 - set up a UDP socket
1530 * @work: RPC transport to connect
1531 *
1532 * Invoked by a work queue tasklet.
1533 */
1534 static void xs_udp_connect_worker4(struct work_struct *work)
1535 {
1536 struct sock_xprt *transport =
1537 container_of(work, struct sock_xprt, connect_worker.work);
1538 struct rpc_xprt *xprt = &transport->xprt;
1539 struct socket *sock = transport->sock;
1540 int err, status = -EIO;
1541
1542 if (xprt->shutdown)
1543 goto out;
1544
1545 /* Start by resetting any existing state */
1546 xs_reset_transport(transport);
1547
1548 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1549 if (err < 0) {
1550 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1551 goto out;
1552 }
1553 xs_reclassify_socket4(sock);
1554
1555 if (xs_bind4(transport, sock)) {
1556 sock_release(sock);
1557 goto out;
1558 }
1559
1560 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1561 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1562
1563 xs_udp_finish_connecting(xprt, sock);
1564 status = 0;
1565 out:
1566 xprt_wake_pending_tasks(xprt, status);
1567 xprt_clear_connecting(xprt);
1568 }
1569
1570 /**
1571 * xs_udp_connect_worker6 - set up a UDP socket
1572 * @work: RPC transport to connect
1573 *
1574 * Invoked by a work queue tasklet.
1575 */
1576 static void xs_udp_connect_worker6(struct work_struct *work)
1577 {
1578 struct sock_xprt *transport =
1579 container_of(work, struct sock_xprt, connect_worker.work);
1580 struct rpc_xprt *xprt = &transport->xprt;
1581 struct socket *sock = transport->sock;
1582 int err, status = -EIO;
1583
1584 if (xprt->shutdown)
1585 goto out;
1586
1587 /* Start by resetting any existing state */
1588 xs_reset_transport(transport);
1589
1590 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1591 if (err < 0) {
1592 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1593 goto out;
1594 }
1595 xs_reclassify_socket6(sock);
1596
1597 if (xs_bind6(transport, sock) < 0) {
1598 sock_release(sock);
1599 goto out;
1600 }
1601
1602 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1603 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1604
1605 xs_udp_finish_connecting(xprt, sock);
1606 status = 0;
1607 out:
1608 xprt_wake_pending_tasks(xprt, status);
1609 xprt_clear_connecting(xprt);
1610 }
1611
1612 /*
1613 * We need to preserve the port number so the reply cache on the server can
1614 * find our cached RPC replies when we get around to reconnecting.
1615 */
1616 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1617 {
1618 int result;
1619 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1620 struct sockaddr any;
1621
1622 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1623
1624 /*
1625 * Disconnect the transport socket by doing a connect operation
1626 * with AF_UNSPEC. This should return immediately...
1627 */
1628 memset(&any, 0, sizeof(any));
1629 any.sa_family = AF_UNSPEC;
1630 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1631 if (result)
1632 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1633 result);
1634 }
1635
1636 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1637 {
1638 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1639
1640 if (!transport->inet) {
1641 struct sock *sk = sock->sk;
1642
1643 write_lock_bh(&sk->sk_callback_lock);
1644
1645 xs_save_old_callbacks(transport, sk);
1646
1647 sk->sk_user_data = xprt;
1648 sk->sk_data_ready = xs_tcp_data_ready;
1649 sk->sk_state_change = xs_tcp_state_change;
1650 sk->sk_write_space = xs_tcp_write_space;
1651 sk->sk_error_report = xs_tcp_error_report;
1652 sk->sk_allocation = GFP_ATOMIC;
1653
1654 /* socket options */
1655 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1656 sock_reset_flag(sk, SOCK_LINGER);
1657 tcp_sk(sk)->linger2 = 0;
1658 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1659
1660 xprt_clear_connected(xprt);
1661
1662 /* Reset to new socket */
1663 transport->sock = sock;
1664 transport->inet = sk;
1665
1666 write_unlock_bh(&sk->sk_callback_lock);
1667 }
1668
1669 if (!xprt_bound(xprt))
1670 return -ENOTCONN;
1671
1672 /* Tell the socket layer to start connecting... */
1673 xprt->stat.connect_count++;
1674 xprt->stat.connect_start = jiffies;
1675 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1676 }
1677
1678 /**
1679 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1680 * @work: RPC transport to connect
1681 *
1682 * Invoked by a work queue tasklet.
1683 */
1684 static void xs_tcp_connect_worker4(struct work_struct *work)
1685 {
1686 struct sock_xprt *transport =
1687 container_of(work, struct sock_xprt, connect_worker.work);
1688 struct rpc_xprt *xprt = &transport->xprt;
1689 struct socket *sock = transport->sock;
1690 int err, status = -EIO;
1691
1692 if (xprt->shutdown)
1693 goto out;
1694
1695 if (!sock) {
1696 /* start from scratch */
1697 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1698 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1699 goto out;
1700 }
1701 xs_reclassify_socket4(sock);
1702
1703 if (xs_bind4(transport, sock) < 0) {
1704 sock_release(sock);
1705 goto out;
1706 }
1707 } else
1708 /* "close" the socket, preserving the local port */
1709 xs_tcp_reuse_connection(xprt);
1710
1711 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1712 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1713
1714 status = xs_tcp_finish_connecting(xprt, sock);
1715 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1716 xprt, -status, xprt_connected(xprt),
1717 sock->sk->sk_state);
1718 if (status < 0) {
1719 switch (status) {
1720 case -EINPROGRESS:
1721 case -EALREADY:
1722 goto out_clear;
1723 case -ECONNREFUSED:
1724 case -ECONNRESET:
1725 /* retry with existing socket, after a delay */
1726 break;
1727 default:
1728 /* get rid of existing socket, and retry */
1729 xs_tcp_shutdown(xprt);
1730 }
1731 }
1732 out:
1733 xprt_wake_pending_tasks(xprt, status);
1734 out_clear:
1735 xprt_clear_connecting(xprt);
1736 }
1737
1738 /**
1739 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1740 * @work: RPC transport to connect
1741 *
1742 * Invoked by a work queue tasklet.
1743 */
1744 static void xs_tcp_connect_worker6(struct work_struct *work)
1745 {
1746 struct sock_xprt *transport =
1747 container_of(work, struct sock_xprt, connect_worker.work);
1748 struct rpc_xprt *xprt = &transport->xprt;
1749 struct socket *sock = transport->sock;
1750 int err, status = -EIO;
1751
1752 if (xprt->shutdown)
1753 goto out;
1754
1755 if (!sock) {
1756 /* start from scratch */
1757 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1758 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1759 goto out;
1760 }
1761 xs_reclassify_socket6(sock);
1762
1763 if (xs_bind6(transport, sock) < 0) {
1764 sock_release(sock);
1765 goto out;
1766 }
1767 } else
1768 /* "close" the socket, preserving the local port */
1769 xs_tcp_reuse_connection(xprt);
1770
1771 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1772 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1773
1774 status = xs_tcp_finish_connecting(xprt, sock);
1775 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1776 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1777 if (status < 0) {
1778 switch (status) {
1779 case -EINPROGRESS:
1780 case -EALREADY:
1781 goto out_clear;
1782 case -ECONNREFUSED:
1783 case -ECONNRESET:
1784 /* retry with existing socket, after a delay */
1785 break;
1786 default:
1787 /* get rid of existing socket, and retry */
1788 xs_tcp_shutdown(xprt);
1789 }
1790 }
1791 out:
1792 xprt_wake_pending_tasks(xprt, status);
1793 out_clear:
1794 xprt_clear_connecting(xprt);
1795 }
1796
1797 /**
1798 * xs_connect - connect a socket to a remote endpoint
1799 * @task: address of RPC task that manages state of connect request
1800 *
1801 * TCP: If the remote end dropped the connection, delay reconnecting.
1802 *
1803 * UDP socket connects are synchronous, but we use a work queue anyway
1804 * to guarantee that even unprivileged user processes can set up a
1805 * socket on a privileged port.
1806 *
1807 * If a UDP socket connect fails, the delay behavior here prevents
1808 * retry floods (hard mounts).
1809 */
1810 static void xs_connect(struct rpc_task *task)
1811 {
1812 struct rpc_xprt *xprt = task->tk_xprt;
1813 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1814
1815 if (xprt_test_and_set_connecting(xprt))
1816 return;
1817
1818 if (transport->sock != NULL) {
1819 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1820 "seconds\n",
1821 xprt, xprt->reestablish_timeout / HZ);
1822 queue_delayed_work(rpciod_workqueue,
1823 &transport->connect_worker,
1824 xprt->reestablish_timeout);
1825 xprt->reestablish_timeout <<= 1;
1826 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1827 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1828 } else {
1829 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1830 queue_delayed_work(rpciod_workqueue,
1831 &transport->connect_worker, 0);
1832 }
1833 }
1834
1835 static void xs_tcp_connect(struct rpc_task *task)
1836 {
1837 struct rpc_xprt *xprt = task->tk_xprt;
1838
1839 /* Exit if we need to wait for socket shutdown to complete */
1840 if (test_bit(XPRT_CLOSING, &xprt->state))
1841 return;
1842 xs_connect(task);
1843 }
1844
1845 /**
1846 * xs_udp_print_stats - display UDP socket-specifc stats
1847 * @xprt: rpc_xprt struct containing statistics
1848 * @seq: output file
1849 *
1850 */
1851 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1852 {
1853 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1854
1855 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1856 transport->port,
1857 xprt->stat.bind_count,
1858 xprt->stat.sends,
1859 xprt->stat.recvs,
1860 xprt->stat.bad_xids,
1861 xprt->stat.req_u,
1862 xprt->stat.bklog_u);
1863 }
1864
1865 /**
1866 * xs_tcp_print_stats - display TCP socket-specifc stats
1867 * @xprt: rpc_xprt struct containing statistics
1868 * @seq: output file
1869 *
1870 */
1871 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1872 {
1873 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1874 long idle_time = 0;
1875
1876 if (xprt_connected(xprt))
1877 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1878
1879 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1880 transport->port,
1881 xprt->stat.bind_count,
1882 xprt->stat.connect_count,
1883 xprt->stat.connect_time,
1884 idle_time,
1885 xprt->stat.sends,
1886 xprt->stat.recvs,
1887 xprt->stat.bad_xids,
1888 xprt->stat.req_u,
1889 xprt->stat.bklog_u);
1890 }
1891
1892 static struct rpc_xprt_ops xs_udp_ops = {
1893 .set_buffer_size = xs_udp_set_buffer_size,
1894 .reserve_xprt = xprt_reserve_xprt_cong,
1895 .release_xprt = xprt_release_xprt_cong,
1896 .rpcbind = rpcb_getport_async,
1897 .set_port = xs_set_port,
1898 .connect = xs_connect,
1899 .buf_alloc = rpc_malloc,
1900 .buf_free = rpc_free,
1901 .send_request = xs_udp_send_request,
1902 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1903 .timer = xs_udp_timer,
1904 .release_request = xprt_release_rqst_cong,
1905 .close = xs_close,
1906 .destroy = xs_destroy,
1907 .print_stats = xs_udp_print_stats,
1908 };
1909
1910 static struct rpc_xprt_ops xs_tcp_ops = {
1911 .reserve_xprt = xprt_reserve_xprt,
1912 .release_xprt = xs_tcp_release_xprt,
1913 .rpcbind = rpcb_getport_async,
1914 .set_port = xs_set_port,
1915 .connect = xs_tcp_connect,
1916 .buf_alloc = rpc_malloc,
1917 .buf_free = rpc_free,
1918 .send_request = xs_tcp_send_request,
1919 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1920 .close = xs_tcp_shutdown,
1921 .destroy = xs_destroy,
1922 .print_stats = xs_tcp_print_stats,
1923 };
1924
1925 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1926 unsigned int slot_table_size)
1927 {
1928 struct rpc_xprt *xprt;
1929 struct sock_xprt *new;
1930
1931 if (args->addrlen > sizeof(xprt->addr)) {
1932 dprintk("RPC: xs_setup_xprt: address too large\n");
1933 return ERR_PTR(-EBADF);
1934 }
1935
1936 new = kzalloc(sizeof(*new), GFP_KERNEL);
1937 if (new == NULL) {
1938 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1939 "rpc_xprt\n");
1940 return ERR_PTR(-ENOMEM);
1941 }
1942 xprt = &new->xprt;
1943
1944 xprt->max_reqs = slot_table_size;
1945 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1946 if (xprt->slot == NULL) {
1947 kfree(xprt);
1948 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1949 "table\n");
1950 return ERR_PTR(-ENOMEM);
1951 }
1952
1953 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1954 xprt->addrlen = args->addrlen;
1955 if (args->srcaddr)
1956 memcpy(&new->addr, args->srcaddr, args->addrlen);
1957
1958 return xprt;
1959 }
1960
1961 static const struct rpc_timeout xs_udp_default_timeout = {
1962 .to_initval = 5 * HZ,
1963 .to_maxval = 30 * HZ,
1964 .to_increment = 5 * HZ,
1965 .to_retries = 5,
1966 };
1967
1968 /**
1969 * xs_setup_udp - Set up transport to use a UDP socket
1970 * @args: rpc transport creation arguments
1971 *
1972 */
1973 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1974 {
1975 struct sockaddr *addr = args->dstaddr;
1976 struct rpc_xprt *xprt;
1977 struct sock_xprt *transport;
1978
1979 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1980 if (IS_ERR(xprt))
1981 return xprt;
1982 transport = container_of(xprt, struct sock_xprt, xprt);
1983
1984 xprt->prot = IPPROTO_UDP;
1985 xprt->tsh_size = 0;
1986 /* XXX: header size can vary due to auth type, IPv6, etc. */
1987 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1988
1989 xprt->bind_timeout = XS_BIND_TO;
1990 xprt->connect_timeout = XS_UDP_CONN_TO;
1991 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1992 xprt->idle_timeout = XS_IDLE_DISC_TO;
1993
1994 xprt->ops = &xs_udp_ops;
1995
1996 xprt->timeout = &xs_udp_default_timeout;
1997
1998 switch (addr->sa_family) {
1999 case AF_INET:
2000 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2001 xprt_set_bound(xprt);
2002
2003 INIT_DELAYED_WORK(&transport->connect_worker,
2004 xs_udp_connect_worker4);
2005 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2006 break;
2007 case AF_INET6:
2008 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2009 xprt_set_bound(xprt);
2010
2011 INIT_DELAYED_WORK(&transport->connect_worker,
2012 xs_udp_connect_worker6);
2013 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2014 break;
2015 default:
2016 kfree(xprt);
2017 return ERR_PTR(-EAFNOSUPPORT);
2018 }
2019
2020 dprintk("RPC: set up transport to address %s\n",
2021 xprt->address_strings[RPC_DISPLAY_ALL]);
2022
2023 if (try_module_get(THIS_MODULE))
2024 return xprt;
2025
2026 kfree(xprt->slot);
2027 kfree(xprt);
2028 return ERR_PTR(-EINVAL);
2029 }
2030
2031 static const struct rpc_timeout xs_tcp_default_timeout = {
2032 .to_initval = 60 * HZ,
2033 .to_maxval = 60 * HZ,
2034 .to_retries = 2,
2035 };
2036
2037 /**
2038 * xs_setup_tcp - Set up transport to use a TCP socket
2039 * @args: rpc transport creation arguments
2040 *
2041 */
2042 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2043 {
2044 struct sockaddr *addr = args->dstaddr;
2045 struct rpc_xprt *xprt;
2046 struct sock_xprt *transport;
2047
2048 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2049 if (IS_ERR(xprt))
2050 return xprt;
2051 transport = container_of(xprt, struct sock_xprt, xprt);
2052
2053 xprt->prot = IPPROTO_TCP;
2054 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2055 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2056
2057 xprt->bind_timeout = XS_BIND_TO;
2058 xprt->connect_timeout = XS_TCP_CONN_TO;
2059 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2060 xprt->idle_timeout = XS_IDLE_DISC_TO;
2061
2062 xprt->ops = &xs_tcp_ops;
2063 xprt->timeout = &xs_tcp_default_timeout;
2064
2065 switch (addr->sa_family) {
2066 case AF_INET:
2067 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2068 xprt_set_bound(xprt);
2069
2070 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2071 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2072 break;
2073 case AF_INET6:
2074 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2075 xprt_set_bound(xprt);
2076
2077 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2078 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2079 break;
2080 default:
2081 kfree(xprt);
2082 return ERR_PTR(-EAFNOSUPPORT);
2083 }
2084
2085 dprintk("RPC: set up transport to address %s\n",
2086 xprt->address_strings[RPC_DISPLAY_ALL]);
2087
2088 if (try_module_get(THIS_MODULE))
2089 return xprt;
2090
2091 kfree(xprt->slot);
2092 kfree(xprt);
2093 return ERR_PTR(-EINVAL);
2094 }
2095
2096 static struct xprt_class xs_udp_transport = {
2097 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2098 .name = "udp",
2099 .owner = THIS_MODULE,
2100 .ident = IPPROTO_UDP,
2101 .setup = xs_setup_udp,
2102 };
2103
2104 static struct xprt_class xs_tcp_transport = {
2105 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2106 .name = "tcp",
2107 .owner = THIS_MODULE,
2108 .ident = IPPROTO_TCP,
2109 .setup = xs_setup_tcp,
2110 };
2111
2112 /**
2113 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2114 *
2115 */
2116 int init_socket_xprt(void)
2117 {
2118 #ifdef RPC_DEBUG
2119 if (!sunrpc_table_header)
2120 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2121 #endif
2122
2123 xprt_register_transport(&xs_udp_transport);
2124 xprt_register_transport(&xs_tcp_transport);
2125
2126 return 0;
2127 }
2128
2129 /**
2130 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2131 *
2132 */
2133 void cleanup_socket_xprt(void)
2134 {
2135 #ifdef RPC_DEBUG
2136 if (sunrpc_table_header) {
2137 unregister_sysctl_table(sunrpc_table_header);
2138 sunrpc_table_header = NULL;
2139 }
2140 #endif
2141
2142 xprt_unregister_transport(&xs_udp_transport);
2143 xprt_unregister_transport(&xs_tcp_transport);
2144 }
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