]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/sunrpc/xprtsock.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


2e070679ab4a332db3b5a24b7479e6582cfecafa
[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 int 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 int ret = 0;
530
531 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
532 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
533 req->rq_slen);
534
535 /* Protect against races with write_space */
536 spin_lock_bh(&xprt->transport_lock);
537
538 /* Don't race with disconnect */
539 if (xprt_connected(xprt)) {
540 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
541 ret = -EAGAIN;
542 /*
543 * Notify TCP that we're limited by the application
544 * window size
545 */
546 set_bit(SOCK_NOSPACE, &transport->sock->flags);
547 transport->inet->sk_write_pending++;
548 /* ...and wait for more buffer space */
549 xprt_wait_for_buffer_space(task, xs_nospace_callback);
550 }
551 } else {
552 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
553 ret = -ENOTCONN;
554 }
555
556 spin_unlock_bh(&xprt->transport_lock);
557 return ret;
558 }
559
560 /**
561 * xs_udp_send_request - write an RPC request to a UDP socket
562 * @task: address of RPC task that manages the state of an RPC request
563 *
564 * Return values:
565 * 0: The request has been sent
566 * EAGAIN: The socket was blocked, please call again later to
567 * complete the request
568 * ENOTCONN: Caller needs to invoke connect logic then call again
569 * other: Some other error occured, the request was not sent
570 */
571 static int xs_udp_send_request(struct rpc_task *task)
572 {
573 struct rpc_rqst *req = task->tk_rqstp;
574 struct rpc_xprt *xprt = req->rq_xprt;
575 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
576 struct xdr_buf *xdr = &req->rq_snd_buf;
577 int status;
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base,
581 req->rq_svec->iov_len);
582
583 if (!xprt_bound(xprt))
584 return -ENOTCONN;
585 status = xs_sendpages(transport->sock,
586 xs_addr(xprt),
587 xprt->addrlen, xdr,
588 req->rq_bytes_sent);
589
590 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
591 xdr->len - req->rq_bytes_sent, status);
592
593 if (status >= 0) {
594 task->tk_bytes_sent += status;
595 if (status >= req->rq_slen)
596 return 0;
597 /* Still some bytes left; set up for a retry later. */
598 status = -EAGAIN;
599 }
600 if (!transport->sock)
601 goto out;
602
603 switch (status) {
604 case -ENOTSOCK:
605 status = -ENOTCONN;
606 /* Should we call xs_close() here? */
607 break;
608 case -EAGAIN:
609 status = xs_nospace(task);
610 break;
611 default:
612 dprintk("RPC: sendmsg returned unrecognized error %d\n",
613 -status);
614 case -ENETUNREACH:
615 case -EPIPE:
616 case -ECONNREFUSED:
617 /* When the server has died, an ICMP port unreachable message
618 * prompts ECONNREFUSED. */
619 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
620 }
621 out:
622 return status;
623 }
624
625 /**
626 * xs_tcp_shutdown - gracefully shut down a TCP socket
627 * @xprt: transport
628 *
629 * Initiates a graceful shutdown of the TCP socket by calling the
630 * equivalent of shutdown(SHUT_WR);
631 */
632 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
633 {
634 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
635 struct socket *sock = transport->sock;
636
637 if (sock != NULL)
638 kernel_sock_shutdown(sock, SHUT_WR);
639 }
640
641 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
642 {
643 u32 reclen = buf->len - sizeof(rpc_fraghdr);
644 rpc_fraghdr *base = buf->head[0].iov_base;
645 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
646 }
647
648 /**
649 * xs_tcp_send_request - write an RPC request to a TCP socket
650 * @task: address of RPC task that manages the state of an RPC request
651 *
652 * Return values:
653 * 0: The request has been sent
654 * EAGAIN: The socket was blocked, please call again later to
655 * complete the request
656 * ENOTCONN: Caller needs to invoke connect logic then call again
657 * other: Some other error occured, the request was not sent
658 *
659 * XXX: In the case of soft timeouts, should we eventually give up
660 * if sendmsg is not able to make progress?
661 */
662 static int xs_tcp_send_request(struct rpc_task *task)
663 {
664 struct rpc_rqst *req = task->tk_rqstp;
665 struct rpc_xprt *xprt = req->rq_xprt;
666 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
667 struct xdr_buf *xdr = &req->rq_snd_buf;
668 int status;
669
670 xs_encode_tcp_record_marker(&req->rq_snd_buf);
671
672 xs_pktdump("packet data:",
673 req->rq_svec->iov_base,
674 req->rq_svec->iov_len);
675
676 /* Continue transmitting the packet/record. We must be careful
677 * to cope with writespace callbacks arriving _after_ we have
678 * called sendmsg(). */
679 while (1) {
680 status = xs_sendpages(transport->sock,
681 NULL, 0, xdr, req->rq_bytes_sent);
682
683 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
684 xdr->len - req->rq_bytes_sent, status);
685
686 if (unlikely(status < 0))
687 break;
688
689 /* If we've sent the entire packet, immediately
690 * reset the count of bytes sent. */
691 req->rq_bytes_sent += status;
692 task->tk_bytes_sent += status;
693 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
694 req->rq_bytes_sent = 0;
695 return 0;
696 }
697
698 if (status != 0)
699 continue;
700 status = -EAGAIN;
701 break;
702 }
703 if (!transport->sock)
704 goto out;
705
706 switch (status) {
707 case -ENOTSOCK:
708 status = -ENOTCONN;
709 /* Should we call xs_close() here? */
710 break;
711 case -EAGAIN:
712 status = xs_nospace(task);
713 break;
714 default:
715 dprintk("RPC: sendmsg returned unrecognized error %d\n",
716 -status);
717 case -ECONNRESET:
718 xs_tcp_shutdown(xprt);
719 case -ECONNREFUSED:
720 case -ENOTCONN:
721 case -EPIPE:
722 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
723 }
724 out:
725 return status;
726 }
727
728 /**
729 * xs_tcp_release_xprt - clean up after a tcp transmission
730 * @xprt: transport
731 * @task: rpc task
732 *
733 * This cleans up if an error causes us to abort the transmission of a request.
734 * In this case, the socket may need to be reset in order to avoid confusing
735 * the server.
736 */
737 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
738 {
739 struct rpc_rqst *req;
740
741 if (task != xprt->snd_task)
742 return;
743 if (task == NULL)
744 goto out_release;
745 req = task->tk_rqstp;
746 if (req->rq_bytes_sent == 0)
747 goto out_release;
748 if (req->rq_bytes_sent == req->rq_snd_buf.len)
749 goto out_release;
750 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
751 out_release:
752 xprt_release_xprt(xprt, task);
753 }
754
755 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
756 {
757 transport->old_data_ready = sk->sk_data_ready;
758 transport->old_state_change = sk->sk_state_change;
759 transport->old_write_space = sk->sk_write_space;
760 transport->old_error_report = sk->sk_error_report;
761 }
762
763 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
764 {
765 sk->sk_data_ready = transport->old_data_ready;
766 sk->sk_state_change = transport->old_state_change;
767 sk->sk_write_space = transport->old_write_space;
768 sk->sk_error_report = transport->old_error_report;
769 }
770
771 static void xs_reset_transport(struct sock_xprt *transport)
772 {
773 struct socket *sock = transport->sock;
774 struct sock *sk = transport->inet;
775
776 if (sk == NULL)
777 return;
778
779 write_lock_bh(&sk->sk_callback_lock);
780 transport->inet = NULL;
781 transport->sock = NULL;
782
783 sk->sk_user_data = NULL;
784
785 xs_restore_old_callbacks(transport, sk);
786 write_unlock_bh(&sk->sk_callback_lock);
787
788 sk->sk_no_check = 0;
789
790 sock_release(sock);
791 }
792
793 /**
794 * xs_close - close a socket
795 * @xprt: transport
796 *
797 * This is used when all requests are complete; ie, no DRC state remains
798 * on the server we want to save.
799 */
800 static void xs_close(struct rpc_xprt *xprt)
801 {
802 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
803
804 dprintk("RPC: xs_close xprt %p\n", xprt);
805
806 xs_reset_transport(transport);
807
808 smp_mb__before_clear_bit();
809 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
810 clear_bit(XPRT_CLOSING, &xprt->state);
811 smp_mb__after_clear_bit();
812 xprt_disconnect_done(xprt);
813 }
814
815 /**
816 * xs_destroy - prepare to shutdown a transport
817 * @xprt: doomed transport
818 *
819 */
820 static void xs_destroy(struct rpc_xprt *xprt)
821 {
822 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
823
824 dprintk("RPC: xs_destroy xprt %p\n", xprt);
825
826 cancel_rearming_delayed_work(&transport->connect_worker);
827
828 xs_close(xprt);
829 xs_free_peer_addresses(xprt);
830 kfree(xprt->slot);
831 kfree(xprt);
832 module_put(THIS_MODULE);
833 }
834
835 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
836 {
837 return (struct rpc_xprt *) sk->sk_user_data;
838 }
839
840 /**
841 * xs_udp_data_ready - "data ready" callback for UDP sockets
842 * @sk: socket with data to read
843 * @len: how much data to read
844 *
845 */
846 static void xs_udp_data_ready(struct sock *sk, int len)
847 {
848 struct rpc_task *task;
849 struct rpc_xprt *xprt;
850 struct rpc_rqst *rovr;
851 struct sk_buff *skb;
852 int err, repsize, copied;
853 u32 _xid;
854 __be32 *xp;
855
856 read_lock(&sk->sk_callback_lock);
857 dprintk("RPC: xs_udp_data_ready...\n");
858 if (!(xprt = xprt_from_sock(sk)))
859 goto out;
860
861 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
862 goto out;
863
864 if (xprt->shutdown)
865 goto dropit;
866
867 repsize = skb->len - sizeof(struct udphdr);
868 if (repsize < 4) {
869 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
870 goto dropit;
871 }
872
873 /* Copy the XID from the skb... */
874 xp = skb_header_pointer(skb, sizeof(struct udphdr),
875 sizeof(_xid), &_xid);
876 if (xp == NULL)
877 goto dropit;
878
879 /* Look up and lock the request corresponding to the given XID */
880 spin_lock(&xprt->transport_lock);
881 rovr = xprt_lookup_rqst(xprt, *xp);
882 if (!rovr)
883 goto out_unlock;
884 task = rovr->rq_task;
885
886 if ((copied = rovr->rq_private_buf.buflen) > repsize)
887 copied = repsize;
888
889 /* Suck it into the iovec, verify checksum if not done by hw. */
890 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
891 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
892 goto out_unlock;
893 }
894
895 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
896
897 /* Something worked... */
898 dst_confirm(skb->dst);
899
900 xprt_adjust_cwnd(task, copied);
901 xprt_update_rtt(task);
902 xprt_complete_rqst(task, copied);
903
904 out_unlock:
905 spin_unlock(&xprt->transport_lock);
906 dropit:
907 skb_free_datagram(sk, skb);
908 out:
909 read_unlock(&sk->sk_callback_lock);
910 }
911
912 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
913 {
914 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
915 size_t len, used;
916 char *p;
917
918 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
919 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
920 used = xdr_skb_read_bits(desc, p, len);
921 transport->tcp_offset += used;
922 if (used != len)
923 return;
924
925 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
926 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
927 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
928 else
929 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
930 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
931
932 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
933 transport->tcp_offset = 0;
934
935 /* Sanity check of the record length */
936 if (unlikely(transport->tcp_reclen < 4)) {
937 dprintk("RPC: invalid TCP record fragment length\n");
938 xprt_force_disconnect(xprt);
939 return;
940 }
941 dprintk("RPC: reading TCP record fragment of length %d\n",
942 transport->tcp_reclen);
943 }
944
945 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
946 {
947 if (transport->tcp_offset == transport->tcp_reclen) {
948 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
949 transport->tcp_offset = 0;
950 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
951 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
952 transport->tcp_flags |= TCP_RCV_COPY_XID;
953 transport->tcp_copied = 0;
954 }
955 }
956 }
957
958 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
959 {
960 size_t len, used;
961 char *p;
962
963 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
964 dprintk("RPC: reading XID (%Zu bytes)\n", len);
965 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
966 used = xdr_skb_read_bits(desc, p, len);
967 transport->tcp_offset += used;
968 if (used != len)
969 return;
970 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
971 transport->tcp_flags |= TCP_RCV_COPY_DATA;
972 transport->tcp_copied = 4;
973 dprintk("RPC: reading reply for XID %08x\n",
974 ntohl(transport->tcp_xid));
975 xs_tcp_check_fraghdr(transport);
976 }
977
978 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
979 {
980 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
981 struct rpc_rqst *req;
982 struct xdr_buf *rcvbuf;
983 size_t len;
984 ssize_t r;
985
986 /* Find and lock the request corresponding to this xid */
987 spin_lock(&xprt->transport_lock);
988 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
989 if (!req) {
990 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
991 dprintk("RPC: XID %08x request not found!\n",
992 ntohl(transport->tcp_xid));
993 spin_unlock(&xprt->transport_lock);
994 return;
995 }
996
997 rcvbuf = &req->rq_private_buf;
998 len = desc->count;
999 if (len > transport->tcp_reclen - transport->tcp_offset) {
1000 struct xdr_skb_reader my_desc;
1001
1002 len = transport->tcp_reclen - transport->tcp_offset;
1003 memcpy(&my_desc, desc, sizeof(my_desc));
1004 my_desc.count = len;
1005 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1006 &my_desc, xdr_skb_read_bits);
1007 desc->count -= r;
1008 desc->offset += r;
1009 } else
1010 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1011 desc, xdr_skb_read_bits);
1012
1013 if (r > 0) {
1014 transport->tcp_copied += r;
1015 transport->tcp_offset += r;
1016 }
1017 if (r != len) {
1018 /* Error when copying to the receive buffer,
1019 * usually because we weren't able to allocate
1020 * additional buffer pages. All we can do now
1021 * is turn off TCP_RCV_COPY_DATA, so the request
1022 * will not receive any additional updates,
1023 * and time out.
1024 * Any remaining data from this record will
1025 * be discarded.
1026 */
1027 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1028 dprintk("RPC: XID %08x truncated request\n",
1029 ntohl(transport->tcp_xid));
1030 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1031 "tcp_offset = %u, tcp_reclen = %u\n",
1032 xprt, transport->tcp_copied,
1033 transport->tcp_offset, transport->tcp_reclen);
1034 goto out;
1035 }
1036
1037 dprintk("RPC: XID %08x read %Zd bytes\n",
1038 ntohl(transport->tcp_xid), r);
1039 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1040 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1041 transport->tcp_offset, transport->tcp_reclen);
1042
1043 if (transport->tcp_copied == req->rq_private_buf.buflen)
1044 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1045 else if (transport->tcp_offset == transport->tcp_reclen) {
1046 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1047 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1048 }
1049
1050 out:
1051 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1052 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1053 spin_unlock(&xprt->transport_lock);
1054 xs_tcp_check_fraghdr(transport);
1055 }
1056
1057 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1058 {
1059 size_t len;
1060
1061 len = transport->tcp_reclen - transport->tcp_offset;
1062 if (len > desc->count)
1063 len = desc->count;
1064 desc->count -= len;
1065 desc->offset += len;
1066 transport->tcp_offset += len;
1067 dprintk("RPC: discarded %Zu bytes\n", len);
1068 xs_tcp_check_fraghdr(transport);
1069 }
1070
1071 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1072 {
1073 struct rpc_xprt *xprt = rd_desc->arg.data;
1074 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1075 struct xdr_skb_reader desc = {
1076 .skb = skb,
1077 .offset = offset,
1078 .count = len,
1079 };
1080
1081 dprintk("RPC: xs_tcp_data_recv started\n");
1082 do {
1083 /* Read in a new fragment marker if necessary */
1084 /* Can we ever really expect to get completely empty fragments? */
1085 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1086 xs_tcp_read_fraghdr(xprt, &desc);
1087 continue;
1088 }
1089 /* Read in the xid if necessary */
1090 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1091 xs_tcp_read_xid(transport, &desc);
1092 continue;
1093 }
1094 /* Read in the request data */
1095 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1096 xs_tcp_read_request(xprt, &desc);
1097 continue;
1098 }
1099 /* Skip over any trailing bytes on short reads */
1100 xs_tcp_read_discard(transport, &desc);
1101 } while (desc.count);
1102 dprintk("RPC: xs_tcp_data_recv done\n");
1103 return len - desc.count;
1104 }
1105
1106 /**
1107 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1108 * @sk: socket with data to read
1109 * @bytes: how much data to read
1110 *
1111 */
1112 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1113 {
1114 struct rpc_xprt *xprt;
1115 read_descriptor_t rd_desc;
1116 int read;
1117
1118 dprintk("RPC: xs_tcp_data_ready...\n");
1119
1120 read_lock(&sk->sk_callback_lock);
1121 if (!(xprt = xprt_from_sock(sk)))
1122 goto out;
1123 if (xprt->shutdown)
1124 goto out;
1125
1126 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1127 rd_desc.arg.data = xprt;
1128 do {
1129 rd_desc.count = 65536;
1130 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1131 } while (read > 0);
1132 out:
1133 read_unlock(&sk->sk_callback_lock);
1134 }
1135
1136 /**
1137 * xs_tcp_state_change - callback to handle TCP socket state changes
1138 * @sk: socket whose state has changed
1139 *
1140 */
1141 static void xs_tcp_state_change(struct sock *sk)
1142 {
1143 struct rpc_xprt *xprt;
1144
1145 read_lock(&sk->sk_callback_lock);
1146 if (!(xprt = xprt_from_sock(sk)))
1147 goto out;
1148 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1149 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1150 sk->sk_state, xprt_connected(xprt),
1151 sock_flag(sk, SOCK_DEAD),
1152 sock_flag(sk, SOCK_ZAPPED));
1153
1154 switch (sk->sk_state) {
1155 case TCP_ESTABLISHED:
1156 spin_lock_bh(&xprt->transport_lock);
1157 if (!xprt_test_and_set_connected(xprt)) {
1158 struct sock_xprt *transport = container_of(xprt,
1159 struct sock_xprt, xprt);
1160
1161 /* Reset TCP record info */
1162 transport->tcp_offset = 0;
1163 transport->tcp_reclen = 0;
1164 transport->tcp_copied = 0;
1165 transport->tcp_flags =
1166 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1167
1168 xprt_wake_pending_tasks(xprt, -EAGAIN);
1169 }
1170 spin_unlock_bh(&xprt->transport_lock);
1171 break;
1172 case TCP_FIN_WAIT1:
1173 /* The client initiated a shutdown of the socket */
1174 xprt->connect_cookie++;
1175 xprt->reestablish_timeout = 0;
1176 set_bit(XPRT_CLOSING, &xprt->state);
1177 smp_mb__before_clear_bit();
1178 clear_bit(XPRT_CONNECTED, &xprt->state);
1179 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1180 smp_mb__after_clear_bit();
1181 break;
1182 case TCP_CLOSE_WAIT:
1183 /* The server initiated a shutdown of the socket */
1184 xprt_force_disconnect(xprt);
1185 case TCP_SYN_SENT:
1186 xprt->connect_cookie++;
1187 case TCP_CLOSING:
1188 /*
1189 * If the server closed down the connection, make sure that
1190 * we back off before reconnecting
1191 */
1192 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1193 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1194 break;
1195 case TCP_LAST_ACK:
1196 set_bit(XPRT_CLOSING, &xprt->state);
1197 smp_mb__before_clear_bit();
1198 clear_bit(XPRT_CONNECTED, &xprt->state);
1199 smp_mb__after_clear_bit();
1200 break;
1201 case TCP_CLOSE:
1202 smp_mb__before_clear_bit();
1203 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1204 clear_bit(XPRT_CLOSING, &xprt->state);
1205 smp_mb__after_clear_bit();
1206 /* Mark transport as closed and wake up all pending tasks */
1207 xprt_disconnect_done(xprt);
1208 }
1209 out:
1210 read_unlock(&sk->sk_callback_lock);
1211 }
1212
1213 /**
1214 * xs_error_report - callback mainly for catching socket errors
1215 * @sk: socket
1216 */
1217 static void xs_error_report(struct sock *sk)
1218 {
1219 struct rpc_xprt *xprt;
1220
1221 read_lock(&sk->sk_callback_lock);
1222 if (!(xprt = xprt_from_sock(sk)))
1223 goto out;
1224 dprintk("RPC: %s client %p...\n"
1225 "RPC: error %d\n",
1226 __func__, xprt, sk->sk_err);
1227 xprt_wake_pending_tasks(xprt, -EAGAIN);
1228 out:
1229 read_unlock(&sk->sk_callback_lock);
1230 }
1231
1232 /**
1233 * xs_udp_write_space - callback invoked when socket buffer space
1234 * becomes available
1235 * @sk: socket whose state has changed
1236 *
1237 * Called when more output buffer space is available for this socket.
1238 * We try not to wake our writers until they can make "significant"
1239 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1240 * with a bunch of small requests.
1241 */
1242 static void xs_udp_write_space(struct sock *sk)
1243 {
1244 read_lock(&sk->sk_callback_lock);
1245
1246 /* from net/core/sock.c:sock_def_write_space */
1247 if (sock_writeable(sk)) {
1248 struct socket *sock;
1249 struct rpc_xprt *xprt;
1250
1251 if (unlikely(!(sock = sk->sk_socket)))
1252 goto out;
1253 clear_bit(SOCK_NOSPACE, &sock->flags);
1254
1255 if (unlikely(!(xprt = xprt_from_sock(sk))))
1256 goto out;
1257 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1258 goto out;
1259
1260 xprt_write_space(xprt);
1261 }
1262
1263 out:
1264 read_unlock(&sk->sk_callback_lock);
1265 }
1266
1267 /**
1268 * xs_tcp_write_space - callback invoked when socket buffer space
1269 * becomes available
1270 * @sk: socket whose state has changed
1271 *
1272 * Called when more output buffer space is available for this socket.
1273 * We try not to wake our writers until they can make "significant"
1274 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1275 * with a bunch of small requests.
1276 */
1277 static void xs_tcp_write_space(struct sock *sk)
1278 {
1279 read_lock(&sk->sk_callback_lock);
1280
1281 /* from net/core/stream.c:sk_stream_write_space */
1282 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1283 struct socket *sock;
1284 struct rpc_xprt *xprt;
1285
1286 if (unlikely(!(sock = sk->sk_socket)))
1287 goto out;
1288 clear_bit(SOCK_NOSPACE, &sock->flags);
1289
1290 if (unlikely(!(xprt = xprt_from_sock(sk))))
1291 goto out;
1292 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1293 goto out;
1294
1295 xprt_write_space(xprt);
1296 }
1297
1298 out:
1299 read_unlock(&sk->sk_callback_lock);
1300 }
1301
1302 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1303 {
1304 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1305 struct sock *sk = transport->inet;
1306
1307 if (transport->rcvsize) {
1308 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1309 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1310 }
1311 if (transport->sndsize) {
1312 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1313 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1314 sk->sk_write_space(sk);
1315 }
1316 }
1317
1318 /**
1319 * xs_udp_set_buffer_size - set send and receive limits
1320 * @xprt: generic transport
1321 * @sndsize: requested size of send buffer, in bytes
1322 * @rcvsize: requested size of receive buffer, in bytes
1323 *
1324 * Set socket send and receive buffer size limits.
1325 */
1326 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1327 {
1328 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1329
1330 transport->sndsize = 0;
1331 if (sndsize)
1332 transport->sndsize = sndsize + 1024;
1333 transport->rcvsize = 0;
1334 if (rcvsize)
1335 transport->rcvsize = rcvsize + 1024;
1336
1337 xs_udp_do_set_buffer_size(xprt);
1338 }
1339
1340 /**
1341 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1342 * @task: task that timed out
1343 *
1344 * Adjust the congestion window after a retransmit timeout has occurred.
1345 */
1346 static void xs_udp_timer(struct rpc_task *task)
1347 {
1348 xprt_adjust_cwnd(task, -ETIMEDOUT);
1349 }
1350
1351 static unsigned short xs_get_random_port(void)
1352 {
1353 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1354 unsigned short rand = (unsigned short) net_random() % range;
1355 return rand + xprt_min_resvport;
1356 }
1357
1358 /**
1359 * xs_set_port - reset the port number in the remote endpoint address
1360 * @xprt: generic transport
1361 * @port: new port number
1362 *
1363 */
1364 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1365 {
1366 struct sockaddr *addr = xs_addr(xprt);
1367
1368 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1369
1370 switch (addr->sa_family) {
1371 case AF_INET:
1372 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1373 break;
1374 case AF_INET6:
1375 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1376 break;
1377 default:
1378 BUG();
1379 }
1380 }
1381
1382 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1383 {
1384 unsigned short port = transport->port;
1385
1386 if (port == 0 && transport->xprt.resvport)
1387 port = xs_get_random_port();
1388 return port;
1389 }
1390
1391 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1392 {
1393 if (transport->port != 0)
1394 transport->port = 0;
1395 if (!transport->xprt.resvport)
1396 return 0;
1397 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1398 return xprt_max_resvport;
1399 return --port;
1400 }
1401
1402 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1403 {
1404 struct sockaddr_in myaddr = {
1405 .sin_family = AF_INET,
1406 };
1407 struct sockaddr_in *sa;
1408 int err, nloop = 0;
1409 unsigned short port = xs_get_srcport(transport, sock);
1410 unsigned short last;
1411
1412 sa = (struct sockaddr_in *)&transport->addr;
1413 myaddr.sin_addr = sa->sin_addr;
1414 do {
1415 myaddr.sin_port = htons(port);
1416 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1417 sizeof(myaddr));
1418 if (port == 0)
1419 break;
1420 if (err == 0) {
1421 transport->port = port;
1422 break;
1423 }
1424 last = port;
1425 port = xs_next_srcport(transport, sock, port);
1426 if (port > last)
1427 nloop++;
1428 } while (err == -EADDRINUSE && nloop != 2);
1429 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1430 __func__, &myaddr.sin_addr,
1431 port, err ? "failed" : "ok", err);
1432 return err;
1433 }
1434
1435 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1436 {
1437 struct sockaddr_in6 myaddr = {
1438 .sin6_family = AF_INET6,
1439 };
1440 struct sockaddr_in6 *sa;
1441 int err, nloop = 0;
1442 unsigned short port = xs_get_srcport(transport, sock);
1443 unsigned short last;
1444
1445 sa = (struct sockaddr_in6 *)&transport->addr;
1446 myaddr.sin6_addr = sa->sin6_addr;
1447 do {
1448 myaddr.sin6_port = htons(port);
1449 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1450 sizeof(myaddr));
1451 if (port == 0)
1452 break;
1453 if (err == 0) {
1454 transport->port = port;
1455 break;
1456 }
1457 last = port;
1458 port = xs_next_srcport(transport, sock, port);
1459 if (port > last)
1460 nloop++;
1461 } while (err == -EADDRINUSE && nloop != 2);
1462 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1463 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1464 return err;
1465 }
1466
1467 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1468 static struct lock_class_key xs_key[2];
1469 static struct lock_class_key xs_slock_key[2];
1470
1471 static inline void xs_reclassify_socket4(struct socket *sock)
1472 {
1473 struct sock *sk = sock->sk;
1474
1475 BUG_ON(sock_owned_by_user(sk));
1476 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1477 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1478 }
1479
1480 static inline void xs_reclassify_socket6(struct socket *sock)
1481 {
1482 struct sock *sk = sock->sk;
1483
1484 BUG_ON(sock_owned_by_user(sk));
1485 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1486 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1487 }
1488 #else
1489 static inline void xs_reclassify_socket4(struct socket *sock)
1490 {
1491 }
1492
1493 static inline void xs_reclassify_socket6(struct socket *sock)
1494 {
1495 }
1496 #endif
1497
1498 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1499 {
1500 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1501
1502 if (!transport->inet) {
1503 struct sock *sk = sock->sk;
1504
1505 write_lock_bh(&sk->sk_callback_lock);
1506
1507 xs_save_old_callbacks(transport, sk);
1508
1509 sk->sk_user_data = xprt;
1510 sk->sk_data_ready = xs_udp_data_ready;
1511 sk->sk_write_space = xs_udp_write_space;
1512 sk->sk_error_report = xs_error_report;
1513 sk->sk_no_check = UDP_CSUM_NORCV;
1514 sk->sk_allocation = GFP_ATOMIC;
1515
1516 xprt_set_connected(xprt);
1517
1518 /* Reset to new socket */
1519 transport->sock = sock;
1520 transport->inet = sk;
1521
1522 write_unlock_bh(&sk->sk_callback_lock);
1523 }
1524 xs_udp_do_set_buffer_size(xprt);
1525 }
1526
1527 /**
1528 * xs_udp_connect_worker4 - set up a UDP socket
1529 * @work: RPC transport to connect
1530 *
1531 * Invoked by a work queue tasklet.
1532 */
1533 static void xs_udp_connect_worker4(struct work_struct *work)
1534 {
1535 struct sock_xprt *transport =
1536 container_of(work, struct sock_xprt, connect_worker.work);
1537 struct rpc_xprt *xprt = &transport->xprt;
1538 struct socket *sock = transport->sock;
1539 int err, status = -EIO;
1540
1541 if (xprt->shutdown)
1542 goto out;
1543
1544 /* Start by resetting any existing state */
1545 xs_reset_transport(transport);
1546
1547 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1548 if (err < 0) {
1549 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1550 goto out;
1551 }
1552 xs_reclassify_socket4(sock);
1553
1554 if (xs_bind4(transport, sock)) {
1555 sock_release(sock);
1556 goto out;
1557 }
1558
1559 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1560 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1561
1562 xs_udp_finish_connecting(xprt, sock);
1563 status = 0;
1564 out:
1565 xprt_wake_pending_tasks(xprt, status);
1566 xprt_clear_connecting(xprt);
1567 }
1568
1569 /**
1570 * xs_udp_connect_worker6 - set up a UDP socket
1571 * @work: RPC transport to connect
1572 *
1573 * Invoked by a work queue tasklet.
1574 */
1575 static void xs_udp_connect_worker6(struct work_struct *work)
1576 {
1577 struct sock_xprt *transport =
1578 container_of(work, struct sock_xprt, connect_worker.work);
1579 struct rpc_xprt *xprt = &transport->xprt;
1580 struct socket *sock = transport->sock;
1581 int err, status = -EIO;
1582
1583 if (xprt->shutdown)
1584 goto out;
1585
1586 /* Start by resetting any existing state */
1587 xs_reset_transport(transport);
1588
1589 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1590 if (err < 0) {
1591 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1592 goto out;
1593 }
1594 xs_reclassify_socket6(sock);
1595
1596 if (xs_bind6(transport, sock) < 0) {
1597 sock_release(sock);
1598 goto out;
1599 }
1600
1601 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1602 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1603
1604 xs_udp_finish_connecting(xprt, sock);
1605 status = 0;
1606 out:
1607 xprt_wake_pending_tasks(xprt, status);
1608 xprt_clear_connecting(xprt);
1609 }
1610
1611 /*
1612 * We need to preserve the port number so the reply cache on the server can
1613 * find our cached RPC replies when we get around to reconnecting.
1614 */
1615 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1616 {
1617 int result;
1618 struct sockaddr any;
1619
1620 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1621
1622 /*
1623 * Disconnect the transport socket by doing a connect operation
1624 * with AF_UNSPEC. This should return immediately...
1625 */
1626 memset(&any, 0, sizeof(any));
1627 any.sa_family = AF_UNSPEC;
1628 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1629 if (result)
1630 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1631 result);
1632 }
1633
1634 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1635 {
1636 unsigned int state = transport->inet->sk_state;
1637
1638 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1639 return;
1640 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1641 return;
1642 xs_abort_connection(xprt, transport);
1643 }
1644
1645 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1646 {
1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1648
1649 if (!transport->inet) {
1650 struct sock *sk = sock->sk;
1651
1652 write_lock_bh(&sk->sk_callback_lock);
1653
1654 xs_save_old_callbacks(transport, sk);
1655
1656 sk->sk_user_data = xprt;
1657 sk->sk_data_ready = xs_tcp_data_ready;
1658 sk->sk_state_change = xs_tcp_state_change;
1659 sk->sk_write_space = xs_tcp_write_space;
1660 sk->sk_error_report = xs_error_report;
1661 sk->sk_allocation = GFP_ATOMIC;
1662
1663 /* socket options */
1664 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1665 sock_reset_flag(sk, SOCK_LINGER);
1666 tcp_sk(sk)->linger2 = 0;
1667 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1668
1669 xprt_clear_connected(xprt);
1670
1671 /* Reset to new socket */
1672 transport->sock = sock;
1673 transport->inet = sk;
1674
1675 write_unlock_bh(&sk->sk_callback_lock);
1676 }
1677
1678 if (!xprt_bound(xprt))
1679 return -ENOTCONN;
1680
1681 /* Tell the socket layer to start connecting... */
1682 xprt->stat.connect_count++;
1683 xprt->stat.connect_start = jiffies;
1684 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1685 }
1686
1687 /**
1688 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1689 * @work: RPC transport to connect
1690 *
1691 * Invoked by a work queue tasklet.
1692 */
1693 static void xs_tcp_connect_worker4(struct work_struct *work)
1694 {
1695 struct sock_xprt *transport =
1696 container_of(work, struct sock_xprt, connect_worker.work);
1697 struct rpc_xprt *xprt = &transport->xprt;
1698 struct socket *sock = transport->sock;
1699 int err, status = -EIO;
1700
1701 if (xprt->shutdown)
1702 goto out;
1703
1704 if (!sock) {
1705 /* start from scratch */
1706 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1707 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1708 goto out;
1709 }
1710 xs_reclassify_socket4(sock);
1711
1712 if (xs_bind4(transport, sock) < 0) {
1713 sock_release(sock);
1714 goto out;
1715 }
1716 } else
1717 /* "close" the socket, preserving the local port */
1718 xs_tcp_reuse_connection(xprt, transport);
1719
1720 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1721 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1722
1723 status = xs_tcp_finish_connecting(xprt, sock);
1724 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1725 xprt, -status, xprt_connected(xprt),
1726 sock->sk->sk_state);
1727 switch (status) {
1728 case -ECONNREFUSED:
1729 case -ECONNRESET:
1730 case -ENETUNREACH:
1731 /* retry with existing socket, after a delay */
1732 case 0:
1733 case -EINPROGRESS:
1734 case -EALREADY:
1735 goto out_clear;
1736 }
1737 /* get rid of existing socket, and retry */
1738 xs_tcp_shutdown(xprt);
1739 printk("%s: connect returned unhandled error %d\n",
1740 __func__, status);
1741 status = -EAGAIN;
1742 out:
1743 xprt_wake_pending_tasks(xprt, status);
1744 out_clear:
1745 xprt_clear_connecting(xprt);
1746 }
1747
1748 /**
1749 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1750 * @work: RPC transport to connect
1751 *
1752 * Invoked by a work queue tasklet.
1753 */
1754 static void xs_tcp_connect_worker6(struct work_struct *work)
1755 {
1756 struct sock_xprt *transport =
1757 container_of(work, struct sock_xprt, connect_worker.work);
1758 struct rpc_xprt *xprt = &transport->xprt;
1759 struct socket *sock = transport->sock;
1760 int err, status = -EIO;
1761
1762 if (xprt->shutdown)
1763 goto out;
1764
1765 if (!sock) {
1766 /* start from scratch */
1767 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1768 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1769 goto out;
1770 }
1771 xs_reclassify_socket6(sock);
1772
1773 if (xs_bind6(transport, sock) < 0) {
1774 sock_release(sock);
1775 goto out;
1776 }
1777 } else
1778 /* "close" the socket, preserving the local port */
1779 xs_tcp_reuse_connection(xprt, transport);
1780
1781 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1782 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1783
1784 status = xs_tcp_finish_connecting(xprt, sock);
1785 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1786 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1787 switch (status) {
1788 case -ECONNREFUSED:
1789 case -ECONNRESET:
1790 case -ENETUNREACH:
1791 /* retry with existing socket, after a delay */
1792 case 0:
1793 case -EINPROGRESS:
1794 case -EALREADY:
1795 goto out_clear;
1796 }
1797 /* get rid of existing socket, and retry */
1798 xs_tcp_shutdown(xprt);
1799 printk("%s: connect returned unhandled error %d\n",
1800 __func__, status);
1801 status = -EAGAIN;
1802 out:
1803 xprt_wake_pending_tasks(xprt, status);
1804 out_clear:
1805 xprt_clear_connecting(xprt);
1806 }
1807
1808 /**
1809 * xs_connect - connect a socket to a remote endpoint
1810 * @task: address of RPC task that manages state of connect request
1811 *
1812 * TCP: If the remote end dropped the connection, delay reconnecting.
1813 *
1814 * UDP socket connects are synchronous, but we use a work queue anyway
1815 * to guarantee that even unprivileged user processes can set up a
1816 * socket on a privileged port.
1817 *
1818 * If a UDP socket connect fails, the delay behavior here prevents
1819 * retry floods (hard mounts).
1820 */
1821 static void xs_connect(struct rpc_task *task)
1822 {
1823 struct rpc_xprt *xprt = task->tk_xprt;
1824 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1825
1826 if (xprt_test_and_set_connecting(xprt))
1827 return;
1828
1829 if (transport->sock != NULL) {
1830 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1831 "seconds\n",
1832 xprt, xprt->reestablish_timeout / HZ);
1833 queue_delayed_work(rpciod_workqueue,
1834 &transport->connect_worker,
1835 xprt->reestablish_timeout);
1836 xprt->reestablish_timeout <<= 1;
1837 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1838 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1839 } else {
1840 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1841 queue_delayed_work(rpciod_workqueue,
1842 &transport->connect_worker, 0);
1843 }
1844 }
1845
1846 static void xs_tcp_connect(struct rpc_task *task)
1847 {
1848 struct rpc_xprt *xprt = task->tk_xprt;
1849
1850 /* Exit if we need to wait for socket shutdown to complete */
1851 if (test_bit(XPRT_CLOSING, &xprt->state))
1852 return;
1853 xs_connect(task);
1854 }
1855
1856 /**
1857 * xs_udp_print_stats - display UDP socket-specifc stats
1858 * @xprt: rpc_xprt struct containing statistics
1859 * @seq: output file
1860 *
1861 */
1862 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1863 {
1864 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1865
1866 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1867 transport->port,
1868 xprt->stat.bind_count,
1869 xprt->stat.sends,
1870 xprt->stat.recvs,
1871 xprt->stat.bad_xids,
1872 xprt->stat.req_u,
1873 xprt->stat.bklog_u);
1874 }
1875
1876 /**
1877 * xs_tcp_print_stats - display TCP socket-specifc stats
1878 * @xprt: rpc_xprt struct containing statistics
1879 * @seq: output file
1880 *
1881 */
1882 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1883 {
1884 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1885 long idle_time = 0;
1886
1887 if (xprt_connected(xprt))
1888 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1889
1890 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1891 transport->port,
1892 xprt->stat.bind_count,
1893 xprt->stat.connect_count,
1894 xprt->stat.connect_time,
1895 idle_time,
1896 xprt->stat.sends,
1897 xprt->stat.recvs,
1898 xprt->stat.bad_xids,
1899 xprt->stat.req_u,
1900 xprt->stat.bklog_u);
1901 }
1902
1903 static struct rpc_xprt_ops xs_udp_ops = {
1904 .set_buffer_size = xs_udp_set_buffer_size,
1905 .reserve_xprt = xprt_reserve_xprt_cong,
1906 .release_xprt = xprt_release_xprt_cong,
1907 .rpcbind = rpcb_getport_async,
1908 .set_port = xs_set_port,
1909 .connect = xs_connect,
1910 .buf_alloc = rpc_malloc,
1911 .buf_free = rpc_free,
1912 .send_request = xs_udp_send_request,
1913 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1914 .timer = xs_udp_timer,
1915 .release_request = xprt_release_rqst_cong,
1916 .close = xs_close,
1917 .destroy = xs_destroy,
1918 .print_stats = xs_udp_print_stats,
1919 };
1920
1921 static struct rpc_xprt_ops xs_tcp_ops = {
1922 .reserve_xprt = xprt_reserve_xprt,
1923 .release_xprt = xs_tcp_release_xprt,
1924 .rpcbind = rpcb_getport_async,
1925 .set_port = xs_set_port,
1926 .connect = xs_tcp_connect,
1927 .buf_alloc = rpc_malloc,
1928 .buf_free = rpc_free,
1929 .send_request = xs_tcp_send_request,
1930 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1931 .close = xs_tcp_shutdown,
1932 .destroy = xs_destroy,
1933 .print_stats = xs_tcp_print_stats,
1934 };
1935
1936 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1937 unsigned int slot_table_size)
1938 {
1939 struct rpc_xprt *xprt;
1940 struct sock_xprt *new;
1941
1942 if (args->addrlen > sizeof(xprt->addr)) {
1943 dprintk("RPC: xs_setup_xprt: address too large\n");
1944 return ERR_PTR(-EBADF);
1945 }
1946
1947 new = kzalloc(sizeof(*new), GFP_KERNEL);
1948 if (new == NULL) {
1949 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1950 "rpc_xprt\n");
1951 return ERR_PTR(-ENOMEM);
1952 }
1953 xprt = &new->xprt;
1954
1955 xprt->max_reqs = slot_table_size;
1956 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1957 if (xprt->slot == NULL) {
1958 kfree(xprt);
1959 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1960 "table\n");
1961 return ERR_PTR(-ENOMEM);
1962 }
1963
1964 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1965 xprt->addrlen = args->addrlen;
1966 if (args->srcaddr)
1967 memcpy(&new->addr, args->srcaddr, args->addrlen);
1968
1969 return xprt;
1970 }
1971
1972 static const struct rpc_timeout xs_udp_default_timeout = {
1973 .to_initval = 5 * HZ,
1974 .to_maxval = 30 * HZ,
1975 .to_increment = 5 * HZ,
1976 .to_retries = 5,
1977 };
1978
1979 /**
1980 * xs_setup_udp - Set up transport to use a UDP socket
1981 * @args: rpc transport creation arguments
1982 *
1983 */
1984 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1985 {
1986 struct sockaddr *addr = args->dstaddr;
1987 struct rpc_xprt *xprt;
1988 struct sock_xprt *transport;
1989
1990 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1991 if (IS_ERR(xprt))
1992 return xprt;
1993 transport = container_of(xprt, struct sock_xprt, xprt);
1994
1995 xprt->prot = IPPROTO_UDP;
1996 xprt->tsh_size = 0;
1997 /* XXX: header size can vary due to auth type, IPv6, etc. */
1998 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1999
2000 xprt->bind_timeout = XS_BIND_TO;
2001 xprt->connect_timeout = XS_UDP_CONN_TO;
2002 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2003 xprt->idle_timeout = XS_IDLE_DISC_TO;
2004
2005 xprt->ops = &xs_udp_ops;
2006
2007 xprt->timeout = &xs_udp_default_timeout;
2008
2009 switch (addr->sa_family) {
2010 case AF_INET:
2011 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2012 xprt_set_bound(xprt);
2013
2014 INIT_DELAYED_WORK(&transport->connect_worker,
2015 xs_udp_connect_worker4);
2016 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2017 break;
2018 case AF_INET6:
2019 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2020 xprt_set_bound(xprt);
2021
2022 INIT_DELAYED_WORK(&transport->connect_worker,
2023 xs_udp_connect_worker6);
2024 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2025 break;
2026 default:
2027 kfree(xprt);
2028 return ERR_PTR(-EAFNOSUPPORT);
2029 }
2030
2031 dprintk("RPC: set up transport to address %s\n",
2032 xprt->address_strings[RPC_DISPLAY_ALL]);
2033
2034 if (try_module_get(THIS_MODULE))
2035 return xprt;
2036
2037 kfree(xprt->slot);
2038 kfree(xprt);
2039 return ERR_PTR(-EINVAL);
2040 }
2041
2042 static const struct rpc_timeout xs_tcp_default_timeout = {
2043 .to_initval = 60 * HZ,
2044 .to_maxval = 60 * HZ,
2045 .to_retries = 2,
2046 };
2047
2048 /**
2049 * xs_setup_tcp - Set up transport to use a TCP socket
2050 * @args: rpc transport creation arguments
2051 *
2052 */
2053 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2054 {
2055 struct sockaddr *addr = args->dstaddr;
2056 struct rpc_xprt *xprt;
2057 struct sock_xprt *transport;
2058
2059 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2060 if (IS_ERR(xprt))
2061 return xprt;
2062 transport = container_of(xprt, struct sock_xprt, xprt);
2063
2064 xprt->prot = IPPROTO_TCP;
2065 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2066 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2067
2068 xprt->bind_timeout = XS_BIND_TO;
2069 xprt->connect_timeout = XS_TCP_CONN_TO;
2070 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2071 xprt->idle_timeout = XS_IDLE_DISC_TO;
2072
2073 xprt->ops = &xs_tcp_ops;
2074 xprt->timeout = &xs_tcp_default_timeout;
2075
2076 switch (addr->sa_family) {
2077 case AF_INET:
2078 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2079 xprt_set_bound(xprt);
2080
2081 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2082 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2083 break;
2084 case AF_INET6:
2085 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2086 xprt_set_bound(xprt);
2087
2088 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2089 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2090 break;
2091 default:
2092 kfree(xprt);
2093 return ERR_PTR(-EAFNOSUPPORT);
2094 }
2095
2096 dprintk("RPC: set up transport to address %s\n",
2097 xprt->address_strings[RPC_DISPLAY_ALL]);
2098
2099 if (try_module_get(THIS_MODULE))
2100 return xprt;
2101
2102 kfree(xprt->slot);
2103 kfree(xprt);
2104 return ERR_PTR(-EINVAL);
2105 }
2106
2107 static struct xprt_class xs_udp_transport = {
2108 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2109 .name = "udp",
2110 .owner = THIS_MODULE,
2111 .ident = IPPROTO_UDP,
2112 .setup = xs_setup_udp,
2113 };
2114
2115 static struct xprt_class xs_tcp_transport = {
2116 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2117 .name = "tcp",
2118 .owner = THIS_MODULE,
2119 .ident = IPPROTO_TCP,
2120 .setup = xs_setup_tcp,
2121 };
2122
2123 /**
2124 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2125 *
2126 */
2127 int init_socket_xprt(void)
2128 {
2129 #ifdef RPC_DEBUG
2130 if (!sunrpc_table_header)
2131 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2132 #endif
2133
2134 xprt_register_transport(&xs_udp_transport);
2135 xprt_register_transport(&xs_tcp_transport);
2136
2137 return 0;
2138 }
2139
2140 /**
2141 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2142 *
2143 */
2144 void cleanup_socket_xprt(void)
2145 {
2146 #ifdef RPC_DEBUG
2147 if (sunrpc_table_header) {
2148 unregister_sysctl_table(sunrpc_table_header);
2149 sunrpc_table_header = NULL;
2150 }
2151 #endif
2152
2153 xprt_unregister_transport(&xs_udp_transport);
2154 xprt_unregister_transport(&xs_tcp_transport);
2155 }
ubuntu-bionic-kernel mirror