]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/sunrpc/xprtsock.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
SUNRPC: Add the equivalent of the linger and linger2 timeouts to RPC sockets
[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 #define XS_TCP_LINGER_TO (15U * HZ)
53
54 /*
55 * We can register our own files under /proc/sys/sunrpc by
56 * calling register_sysctl_table() again. The files in that
57 * directory become the union of all files registered there.
58 *
59 * We simply need to make sure that we don't collide with
60 * someone else's file names!
61 */
62
63 #ifdef RPC_DEBUG
64
65 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
66 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
67 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
68 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
69
70 static struct ctl_table_header *sunrpc_table_header;
71
72 /*
73 * FIXME: changing the UDP slot table size should also resize the UDP
74 * socket buffers for existing UDP transports
75 */
76 static ctl_table xs_tunables_table[] = {
77 {
78 .ctl_name = CTL_SLOTTABLE_UDP,
79 .procname = "udp_slot_table_entries",
80 .data = &xprt_udp_slot_table_entries,
81 .maxlen = sizeof(unsigned int),
82 .mode = 0644,
83 .proc_handler = &proc_dointvec_minmax,
84 .strategy = &sysctl_intvec,
85 .extra1 = &min_slot_table_size,
86 .extra2 = &max_slot_table_size
87 },
88 {
89 .ctl_name = CTL_SLOTTABLE_TCP,
90 .procname = "tcp_slot_table_entries",
91 .data = &xprt_tcp_slot_table_entries,
92 .maxlen = sizeof(unsigned int),
93 .mode = 0644,
94 .proc_handler = &proc_dointvec_minmax,
95 .strategy = &sysctl_intvec,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .ctl_name = CTL_MIN_RESVPORT,
101 .procname = "min_resvport",
102 .data = &xprt_min_resvport,
103 .maxlen = sizeof(unsigned int),
104 .mode = 0644,
105 .proc_handler = &proc_dointvec_minmax,
106 .strategy = &sysctl_intvec,
107 .extra1 = &xprt_min_resvport_limit,
108 .extra2 = &xprt_max_resvport_limit
109 },
110 {
111 .ctl_name = CTL_MAX_RESVPORT,
112 .procname = "max_resvport",
113 .data = &xprt_max_resvport,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = &proc_dointvec_minmax,
117 .strategy = &sysctl_intvec,
118 .extra1 = &xprt_min_resvport_limit,
119 .extra2 = &xprt_max_resvport_limit
120 },
121 {
122 .ctl_name = 0,
123 },
124 };
125
126 static ctl_table sunrpc_table[] = {
127 {
128 .ctl_name = CTL_SUNRPC,
129 .procname = "sunrpc",
130 .mode = 0555,
131 .child = xs_tunables_table
132 },
133 {
134 .ctl_name = 0,
135 },
136 };
137
138 #endif
139
140 /*
141 * Time out for an RPC UDP socket connect. UDP socket connects are
142 * synchronous, but we set a timeout anyway in case of resource
143 * exhaustion on the local host.
144 */
145 #define XS_UDP_CONN_TO (5U * HZ)
146
147 /*
148 * Wait duration for an RPC TCP connection to be established. Solaris
149 * NFS over TCP uses 60 seconds, for example, which is in line with how
150 * long a server takes to reboot.
151 */
152 #define XS_TCP_CONN_TO (60U * HZ)
153
154 /*
155 * Wait duration for a reply from the RPC portmapper.
156 */
157 #define XS_BIND_TO (60U * HZ)
158
159 /*
160 * Delay if a UDP socket connect error occurs. This is most likely some
161 * kind of resource problem on the local host.
162 */
163 #define XS_UDP_REEST_TO (2U * HZ)
164
165 /*
166 * The reestablish timeout allows clients to delay for a bit before attempting
167 * to reconnect to a server that just dropped our connection.
168 *
169 * We implement an exponential backoff when trying to reestablish a TCP
170 * transport connection with the server. Some servers like to drop a TCP
171 * connection when they are overworked, so we start with a short timeout and
172 * increase over time if the server is down or not responding.
173 */
174 #define XS_TCP_INIT_REEST_TO (3U * HZ)
175 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
176
177 /*
178 * TCP idle timeout; client drops the transport socket if it is idle
179 * for this long. Note that we also timeout UDP sockets to prevent
180 * holding port numbers when there is no RPC traffic.
181 */
182 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
183
184 #ifdef RPC_DEBUG
185 # undef RPC_DEBUG_DATA
186 # define RPCDBG_FACILITY RPCDBG_TRANS
187 #endif
188
189 #ifdef RPC_DEBUG_DATA
190 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
191 {
192 u8 *buf = (u8 *) packet;
193 int j;
194
195 dprintk("RPC: %s\n", msg);
196 for (j = 0; j < count && j < 128; j += 4) {
197 if (!(j & 31)) {
198 if (j)
199 dprintk("\n");
200 dprintk("0x%04x ", j);
201 }
202 dprintk("%02x%02x%02x%02x ",
203 buf[j], buf[j+1], buf[j+2], buf[j+3]);
204 }
205 dprintk("\n");
206 }
207 #else
208 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
209 {
210 /* NOP */
211 }
212 #endif
213
214 struct sock_xprt {
215 struct rpc_xprt xprt;
216
217 /*
218 * Network layer
219 */
220 struct socket * sock;
221 struct sock * inet;
222
223 /*
224 * State of TCP reply receive
225 */
226 __be32 tcp_fraghdr,
227 tcp_xid;
228
229 u32 tcp_offset,
230 tcp_reclen;
231
232 unsigned long tcp_copied,
233 tcp_flags;
234
235 /*
236 * Connection of transports
237 */
238 struct delayed_work connect_worker;
239 struct sockaddr_storage addr;
240 unsigned short port;
241
242 /*
243 * UDP socket buffer size parameters
244 */
245 size_t rcvsize,
246 sndsize;
247
248 /*
249 * Saved socket callback addresses
250 */
251 void (*old_data_ready)(struct sock *, int);
252 void (*old_state_change)(struct sock *);
253 void (*old_write_space)(struct sock *);
254 void (*old_error_report)(struct sock *);
255 };
256
257 /*
258 * TCP receive state flags
259 */
260 #define TCP_RCV_LAST_FRAG (1UL << 0)
261 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
262 #define TCP_RCV_COPY_XID (1UL << 2)
263 #define TCP_RCV_COPY_DATA (1UL << 3)
264
265 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
266 {
267 return (struct sockaddr *) &xprt->addr;
268 }
269
270 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
271 {
272 return (struct sockaddr_in *) &xprt->addr;
273 }
274
275 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
276 {
277 return (struct sockaddr_in6 *) &xprt->addr;
278 }
279
280 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
281 const char *protocol,
282 const char *netid)
283 {
284 struct sockaddr_in *addr = xs_addr_in(xprt);
285 char *buf;
286
287 buf = kzalloc(20, GFP_KERNEL);
288 if (buf) {
289 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
290 }
291 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
292
293 buf = kzalloc(8, GFP_KERNEL);
294 if (buf) {
295 snprintf(buf, 8, "%u",
296 ntohs(addr->sin_port));
297 }
298 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
299
300 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
301
302 buf = kzalloc(48, GFP_KERNEL);
303 if (buf) {
304 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
305 &addr->sin_addr.s_addr,
306 ntohs(addr->sin_port),
307 protocol);
308 }
309 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
310
311 buf = kzalloc(10, GFP_KERNEL);
312 if (buf) {
313 snprintf(buf, 10, "%02x%02x%02x%02x",
314 NIPQUAD(addr->sin_addr.s_addr));
315 }
316 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
317
318 buf = kzalloc(8, GFP_KERNEL);
319 if (buf) {
320 snprintf(buf, 8, "%4hx",
321 ntohs(addr->sin_port));
322 }
323 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
324
325 buf = kzalloc(30, GFP_KERNEL);
326 if (buf) {
327 snprintf(buf, 30, "%pI4.%u.%u",
328 &addr->sin_addr.s_addr,
329 ntohs(addr->sin_port) >> 8,
330 ntohs(addr->sin_port) & 0xff);
331 }
332 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
333
334 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
335 }
336
337 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
338 const char *protocol,
339 const char *netid)
340 {
341 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
342 char *buf;
343
344 buf = kzalloc(40, GFP_KERNEL);
345 if (buf) {
346 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
347 }
348 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
349
350 buf = kzalloc(8, GFP_KERNEL);
351 if (buf) {
352 snprintf(buf, 8, "%u",
353 ntohs(addr->sin6_port));
354 }
355 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
356
357 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
358
359 buf = kzalloc(64, GFP_KERNEL);
360 if (buf) {
361 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
362 &addr->sin6_addr,
363 ntohs(addr->sin6_port),
364 protocol);
365 }
366 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
367
368 buf = kzalloc(36, GFP_KERNEL);
369 if (buf)
370 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
371
372 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
373
374 buf = kzalloc(8, GFP_KERNEL);
375 if (buf) {
376 snprintf(buf, 8, "%4hx",
377 ntohs(addr->sin6_port));
378 }
379 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
380
381 buf = kzalloc(50, GFP_KERNEL);
382 if (buf) {
383 snprintf(buf, 50, "%pI6.%u.%u",
384 &addr->sin6_addr,
385 ntohs(addr->sin6_port) >> 8,
386 ntohs(addr->sin6_port) & 0xff);
387 }
388 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
389
390 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
391 }
392
393 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
394 {
395 unsigned int i;
396
397 for (i = 0; i < RPC_DISPLAY_MAX; i++)
398 switch (i) {
399 case RPC_DISPLAY_PROTO:
400 case RPC_DISPLAY_NETID:
401 continue;
402 default:
403 kfree(xprt->address_strings[i]);
404 }
405 }
406
407 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
408
409 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
410 {
411 struct msghdr msg = {
412 .msg_name = addr,
413 .msg_namelen = addrlen,
414 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
415 };
416 struct kvec iov = {
417 .iov_base = vec->iov_base + base,
418 .iov_len = vec->iov_len - base,
419 };
420
421 if (iov.iov_len != 0)
422 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
423 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
424 }
425
426 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
427 {
428 struct page **ppage;
429 unsigned int remainder;
430 int err, sent = 0;
431
432 remainder = xdr->page_len - base;
433 base += xdr->page_base;
434 ppage = xdr->pages + (base >> PAGE_SHIFT);
435 base &= ~PAGE_MASK;
436 for(;;) {
437 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
438 int flags = XS_SENDMSG_FLAGS;
439
440 remainder -= len;
441 if (remainder != 0 || more)
442 flags |= MSG_MORE;
443 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
444 if (remainder == 0 || err != len)
445 break;
446 sent += err;
447 ppage++;
448 base = 0;
449 }
450 if (sent == 0)
451 return err;
452 if (err > 0)
453 sent += err;
454 return sent;
455 }
456
457 /**
458 * xs_sendpages - write pages directly to a socket
459 * @sock: socket to send on
460 * @addr: UDP only -- address of destination
461 * @addrlen: UDP only -- length of destination address
462 * @xdr: buffer containing this request
463 * @base: starting position in the buffer
464 *
465 */
466 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
467 {
468 unsigned int remainder = xdr->len - base;
469 int err, sent = 0;
470
471 if (unlikely(!sock))
472 return -ENOTSOCK;
473
474 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
475 if (base != 0) {
476 addr = NULL;
477 addrlen = 0;
478 }
479
480 if (base < xdr->head[0].iov_len || addr != NULL) {
481 unsigned int len = xdr->head[0].iov_len - base;
482 remainder -= len;
483 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
484 if (remainder == 0 || err != len)
485 goto out;
486 sent += err;
487 base = 0;
488 } else
489 base -= xdr->head[0].iov_len;
490
491 if (base < xdr->page_len) {
492 unsigned int len = xdr->page_len - base;
493 remainder -= len;
494 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
495 if (remainder == 0 || err != len)
496 goto out;
497 sent += err;
498 base = 0;
499 } else
500 base -= xdr->page_len;
501
502 if (base >= xdr->tail[0].iov_len)
503 return sent;
504 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
505 out:
506 if (sent == 0)
507 return err;
508 if (err > 0)
509 sent += err;
510 return sent;
511 }
512
513 static void xs_nospace_callback(struct rpc_task *task)
514 {
515 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
516
517 transport->inet->sk_write_pending--;
518 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
519 }
520
521 /**
522 * xs_nospace - place task on wait queue if transmit was incomplete
523 * @task: task to put to sleep
524 *
525 */
526 static int xs_nospace(struct rpc_task *task)
527 {
528 struct rpc_rqst *req = task->tk_rqstp;
529 struct rpc_xprt *xprt = req->rq_xprt;
530 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
531 int ret = 0;
532
533 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
534 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
535 req->rq_slen);
536
537 /* Protect against races with write_space */
538 spin_lock_bh(&xprt->transport_lock);
539
540 /* Don't race with disconnect */
541 if (xprt_connected(xprt)) {
542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
543 ret = -EAGAIN;
544 /*
545 * Notify TCP that we're limited by the application
546 * window size
547 */
548 set_bit(SOCK_NOSPACE, &transport->sock->flags);
549 transport->inet->sk_write_pending++;
550 /* ...and wait for more buffer space */
551 xprt_wait_for_buffer_space(task, xs_nospace_callback);
552 }
553 } else {
554 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
555 ret = -ENOTCONN;
556 }
557
558 spin_unlock_bh(&xprt->transport_lock);
559 return ret;
560 }
561
562 /**
563 * xs_udp_send_request - write an RPC request to a UDP socket
564 * @task: address of RPC task that manages the state of an RPC request
565 *
566 * Return values:
567 * 0: The request has been sent
568 * EAGAIN: The socket was blocked, please call again later to
569 * complete the request
570 * ENOTCONN: Caller needs to invoke connect logic then call again
571 * other: Some other error occured, the request was not sent
572 */
573 static int xs_udp_send_request(struct rpc_task *task)
574 {
575 struct rpc_rqst *req = task->tk_rqstp;
576 struct rpc_xprt *xprt = req->rq_xprt;
577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
578 struct xdr_buf *xdr = &req->rq_snd_buf;
579 int status;
580
581 xs_pktdump("packet data:",
582 req->rq_svec->iov_base,
583 req->rq_svec->iov_len);
584
585 if (!xprt_bound(xprt))
586 return -ENOTCONN;
587 status = xs_sendpages(transport->sock,
588 xs_addr(xprt),
589 xprt->addrlen, xdr,
590 req->rq_bytes_sent);
591
592 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
593 xdr->len - req->rq_bytes_sent, status);
594
595 if (status >= 0) {
596 task->tk_bytes_sent += status;
597 if (status >= req->rq_slen)
598 return 0;
599 /* Still some bytes left; set up for a retry later. */
600 status = -EAGAIN;
601 }
602 if (!transport->sock)
603 goto out;
604
605 switch (status) {
606 case -ENOTSOCK:
607 status = -ENOTCONN;
608 /* Should we call xs_close() here? */
609 break;
610 case -EAGAIN:
611 status = xs_nospace(task);
612 break;
613 default:
614 dprintk("RPC: sendmsg returned unrecognized error %d\n",
615 -status);
616 case -ENETUNREACH:
617 case -EPIPE:
618 case -ECONNREFUSED:
619 /* When the server has died, an ICMP port unreachable message
620 * prompts ECONNREFUSED. */
621 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
622 }
623 out:
624 return status;
625 }
626
627 /**
628 * xs_tcp_shutdown - gracefully shut down a TCP socket
629 * @xprt: transport
630 *
631 * Initiates a graceful shutdown of the TCP socket by calling the
632 * equivalent of shutdown(SHUT_WR);
633 */
634 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
635 {
636 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
637 struct socket *sock = transport->sock;
638
639 if (sock != NULL)
640 kernel_sock_shutdown(sock, SHUT_WR);
641 }
642
643 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
644 {
645 u32 reclen = buf->len - sizeof(rpc_fraghdr);
646 rpc_fraghdr *base = buf->head[0].iov_base;
647 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
648 }
649
650 /**
651 * xs_tcp_send_request - write an RPC request to a TCP socket
652 * @task: address of RPC task that manages the state of an RPC request
653 *
654 * Return values:
655 * 0: The request has been sent
656 * EAGAIN: The socket was blocked, please call again later to
657 * complete the request
658 * ENOTCONN: Caller needs to invoke connect logic then call again
659 * other: Some other error occured, the request was not sent
660 *
661 * XXX: In the case of soft timeouts, should we eventually give up
662 * if sendmsg is not able to make progress?
663 */
664 static int xs_tcp_send_request(struct rpc_task *task)
665 {
666 struct rpc_rqst *req = task->tk_rqstp;
667 struct rpc_xprt *xprt = req->rq_xprt;
668 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
669 struct xdr_buf *xdr = &req->rq_snd_buf;
670 int status;
671
672 xs_encode_tcp_record_marker(&req->rq_snd_buf);
673
674 xs_pktdump("packet data:",
675 req->rq_svec->iov_base,
676 req->rq_svec->iov_len);
677
678 /* Continue transmitting the packet/record. We must be careful
679 * to cope with writespace callbacks arriving _after_ we have
680 * called sendmsg(). */
681 while (1) {
682 status = xs_sendpages(transport->sock,
683 NULL, 0, xdr, req->rq_bytes_sent);
684
685 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
686 xdr->len - req->rq_bytes_sent, status);
687
688 if (unlikely(status < 0))
689 break;
690
691 /* If we've sent the entire packet, immediately
692 * reset the count of bytes sent. */
693 req->rq_bytes_sent += status;
694 task->tk_bytes_sent += status;
695 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
696 req->rq_bytes_sent = 0;
697 return 0;
698 }
699
700 if (status != 0)
701 continue;
702 status = -EAGAIN;
703 break;
704 }
705 if (!transport->sock)
706 goto out;
707
708 switch (status) {
709 case -ENOTSOCK:
710 status = -ENOTCONN;
711 /* Should we call xs_close() here? */
712 break;
713 case -EAGAIN:
714 status = xs_nospace(task);
715 break;
716 default:
717 dprintk("RPC: sendmsg returned unrecognized error %d\n",
718 -status);
719 case -ECONNRESET:
720 xs_tcp_shutdown(xprt);
721 case -ECONNREFUSED:
722 case -ENOTCONN:
723 case -EPIPE:
724 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
725 }
726 out:
727 return status;
728 }
729
730 /**
731 * xs_tcp_release_xprt - clean up after a tcp transmission
732 * @xprt: transport
733 * @task: rpc task
734 *
735 * This cleans up if an error causes us to abort the transmission of a request.
736 * In this case, the socket may need to be reset in order to avoid confusing
737 * the server.
738 */
739 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
740 {
741 struct rpc_rqst *req;
742
743 if (task != xprt->snd_task)
744 return;
745 if (task == NULL)
746 goto out_release;
747 req = task->tk_rqstp;
748 if (req->rq_bytes_sent == 0)
749 goto out_release;
750 if (req->rq_bytes_sent == req->rq_snd_buf.len)
751 goto out_release;
752 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
753 out_release:
754 xprt_release_xprt(xprt, task);
755 }
756
757 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
758 {
759 transport->old_data_ready = sk->sk_data_ready;
760 transport->old_state_change = sk->sk_state_change;
761 transport->old_write_space = sk->sk_write_space;
762 transport->old_error_report = sk->sk_error_report;
763 }
764
765 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
766 {
767 sk->sk_data_ready = transport->old_data_ready;
768 sk->sk_state_change = transport->old_state_change;
769 sk->sk_write_space = transport->old_write_space;
770 sk->sk_error_report = transport->old_error_report;
771 }
772
773 static void xs_reset_transport(struct sock_xprt *transport)
774 {
775 struct socket *sock = transport->sock;
776 struct sock *sk = transport->inet;
777
778 if (sk == NULL)
779 return;
780
781 write_lock_bh(&sk->sk_callback_lock);
782 transport->inet = NULL;
783 transport->sock = NULL;
784
785 sk->sk_user_data = NULL;
786
787 xs_restore_old_callbacks(transport, sk);
788 write_unlock_bh(&sk->sk_callback_lock);
789
790 sk->sk_no_check = 0;
791
792 sock_release(sock);
793 }
794
795 /**
796 * xs_close - close a socket
797 * @xprt: transport
798 *
799 * This is used when all requests are complete; ie, no DRC state remains
800 * on the server we want to save.
801 */
802 static void xs_close(struct rpc_xprt *xprt)
803 {
804 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
805
806 dprintk("RPC: xs_close xprt %p\n", xprt);
807
808 xs_reset_transport(transport);
809
810 smp_mb__before_clear_bit();
811 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
812 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
813 clear_bit(XPRT_CLOSING, &xprt->state);
814 smp_mb__after_clear_bit();
815 xprt_disconnect_done(xprt);
816 }
817
818 /**
819 * xs_destroy - prepare to shutdown a transport
820 * @xprt: doomed transport
821 *
822 */
823 static void xs_destroy(struct rpc_xprt *xprt)
824 {
825 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
826
827 dprintk("RPC: xs_destroy xprt %p\n", xprt);
828
829 cancel_rearming_delayed_work(&transport->connect_worker);
830
831 xs_close(xprt);
832 xs_free_peer_addresses(xprt);
833 kfree(xprt->slot);
834 kfree(xprt);
835 module_put(THIS_MODULE);
836 }
837
838 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
839 {
840 return (struct rpc_xprt *) sk->sk_user_data;
841 }
842
843 /**
844 * xs_udp_data_ready - "data ready" callback for UDP sockets
845 * @sk: socket with data to read
846 * @len: how much data to read
847 *
848 */
849 static void xs_udp_data_ready(struct sock *sk, int len)
850 {
851 struct rpc_task *task;
852 struct rpc_xprt *xprt;
853 struct rpc_rqst *rovr;
854 struct sk_buff *skb;
855 int err, repsize, copied;
856 u32 _xid;
857 __be32 *xp;
858
859 read_lock(&sk->sk_callback_lock);
860 dprintk("RPC: xs_udp_data_ready...\n");
861 if (!(xprt = xprt_from_sock(sk)))
862 goto out;
863
864 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
865 goto out;
866
867 if (xprt->shutdown)
868 goto dropit;
869
870 repsize = skb->len - sizeof(struct udphdr);
871 if (repsize < 4) {
872 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
873 goto dropit;
874 }
875
876 /* Copy the XID from the skb... */
877 xp = skb_header_pointer(skb, sizeof(struct udphdr),
878 sizeof(_xid), &_xid);
879 if (xp == NULL)
880 goto dropit;
881
882 /* Look up and lock the request corresponding to the given XID */
883 spin_lock(&xprt->transport_lock);
884 rovr = xprt_lookup_rqst(xprt, *xp);
885 if (!rovr)
886 goto out_unlock;
887 task = rovr->rq_task;
888
889 if ((copied = rovr->rq_private_buf.buflen) > repsize)
890 copied = repsize;
891
892 /* Suck it into the iovec, verify checksum if not done by hw. */
893 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
894 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
895 goto out_unlock;
896 }
897
898 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
899
900 /* Something worked... */
901 dst_confirm(skb->dst);
902
903 xprt_adjust_cwnd(task, copied);
904 xprt_update_rtt(task);
905 xprt_complete_rqst(task, copied);
906
907 out_unlock:
908 spin_unlock(&xprt->transport_lock);
909 dropit:
910 skb_free_datagram(sk, skb);
911 out:
912 read_unlock(&sk->sk_callback_lock);
913 }
914
915 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
916 {
917 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
918 size_t len, used;
919 char *p;
920
921 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
922 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
923 used = xdr_skb_read_bits(desc, p, len);
924 transport->tcp_offset += used;
925 if (used != len)
926 return;
927
928 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
929 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
930 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
931 else
932 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
933 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
934
935 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
936 transport->tcp_offset = 0;
937
938 /* Sanity check of the record length */
939 if (unlikely(transport->tcp_reclen < 4)) {
940 dprintk("RPC: invalid TCP record fragment length\n");
941 xprt_force_disconnect(xprt);
942 return;
943 }
944 dprintk("RPC: reading TCP record fragment of length %d\n",
945 transport->tcp_reclen);
946 }
947
948 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
949 {
950 if (transport->tcp_offset == transport->tcp_reclen) {
951 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
952 transport->tcp_offset = 0;
953 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
954 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
955 transport->tcp_flags |= TCP_RCV_COPY_XID;
956 transport->tcp_copied = 0;
957 }
958 }
959 }
960
961 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
962 {
963 size_t len, used;
964 char *p;
965
966 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
967 dprintk("RPC: reading XID (%Zu bytes)\n", len);
968 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
969 used = xdr_skb_read_bits(desc, p, len);
970 transport->tcp_offset += used;
971 if (used != len)
972 return;
973 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
974 transport->tcp_flags |= TCP_RCV_COPY_DATA;
975 transport->tcp_copied = 4;
976 dprintk("RPC: reading reply for XID %08x\n",
977 ntohl(transport->tcp_xid));
978 xs_tcp_check_fraghdr(transport);
979 }
980
981 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
982 {
983 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
984 struct rpc_rqst *req;
985 struct xdr_buf *rcvbuf;
986 size_t len;
987 ssize_t r;
988
989 /* Find and lock the request corresponding to this xid */
990 spin_lock(&xprt->transport_lock);
991 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
992 if (!req) {
993 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
994 dprintk("RPC: XID %08x request not found!\n",
995 ntohl(transport->tcp_xid));
996 spin_unlock(&xprt->transport_lock);
997 return;
998 }
999
1000 rcvbuf = &req->rq_private_buf;
1001 len = desc->count;
1002 if (len > transport->tcp_reclen - transport->tcp_offset) {
1003 struct xdr_skb_reader my_desc;
1004
1005 len = transport->tcp_reclen - transport->tcp_offset;
1006 memcpy(&my_desc, desc, sizeof(my_desc));
1007 my_desc.count = len;
1008 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1009 &my_desc, xdr_skb_read_bits);
1010 desc->count -= r;
1011 desc->offset += r;
1012 } else
1013 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1014 desc, xdr_skb_read_bits);
1015
1016 if (r > 0) {
1017 transport->tcp_copied += r;
1018 transport->tcp_offset += r;
1019 }
1020 if (r != len) {
1021 /* Error when copying to the receive buffer,
1022 * usually because we weren't able to allocate
1023 * additional buffer pages. All we can do now
1024 * is turn off TCP_RCV_COPY_DATA, so the request
1025 * will not receive any additional updates,
1026 * and time out.
1027 * Any remaining data from this record will
1028 * be discarded.
1029 */
1030 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1031 dprintk("RPC: XID %08x truncated request\n",
1032 ntohl(transport->tcp_xid));
1033 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1034 "tcp_offset = %u, tcp_reclen = %u\n",
1035 xprt, transport->tcp_copied,
1036 transport->tcp_offset, transport->tcp_reclen);
1037 goto out;
1038 }
1039
1040 dprintk("RPC: XID %08x read %Zd bytes\n",
1041 ntohl(transport->tcp_xid), r);
1042 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1043 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1044 transport->tcp_offset, transport->tcp_reclen);
1045
1046 if (transport->tcp_copied == req->rq_private_buf.buflen)
1047 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1048 else if (transport->tcp_offset == transport->tcp_reclen) {
1049 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1050 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1051 }
1052
1053 out:
1054 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1055 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1056 spin_unlock(&xprt->transport_lock);
1057 xs_tcp_check_fraghdr(transport);
1058 }
1059
1060 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1061 {
1062 size_t len;
1063
1064 len = transport->tcp_reclen - transport->tcp_offset;
1065 if (len > desc->count)
1066 len = desc->count;
1067 desc->count -= len;
1068 desc->offset += len;
1069 transport->tcp_offset += len;
1070 dprintk("RPC: discarded %Zu bytes\n", len);
1071 xs_tcp_check_fraghdr(transport);
1072 }
1073
1074 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1075 {
1076 struct rpc_xprt *xprt = rd_desc->arg.data;
1077 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1078 struct xdr_skb_reader desc = {
1079 .skb = skb,
1080 .offset = offset,
1081 .count = len,
1082 };
1083
1084 dprintk("RPC: xs_tcp_data_recv started\n");
1085 do {
1086 /* Read in a new fragment marker if necessary */
1087 /* Can we ever really expect to get completely empty fragments? */
1088 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1089 xs_tcp_read_fraghdr(xprt, &desc);
1090 continue;
1091 }
1092 /* Read in the xid if necessary */
1093 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1094 xs_tcp_read_xid(transport, &desc);
1095 continue;
1096 }
1097 /* Read in the request data */
1098 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1099 xs_tcp_read_request(xprt, &desc);
1100 continue;
1101 }
1102 /* Skip over any trailing bytes on short reads */
1103 xs_tcp_read_discard(transport, &desc);
1104 } while (desc.count);
1105 dprintk("RPC: xs_tcp_data_recv done\n");
1106 return len - desc.count;
1107 }
1108
1109 /**
1110 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1111 * @sk: socket with data to read
1112 * @bytes: how much data to read
1113 *
1114 */
1115 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1116 {
1117 struct rpc_xprt *xprt;
1118 read_descriptor_t rd_desc;
1119 int read;
1120
1121 dprintk("RPC: xs_tcp_data_ready...\n");
1122
1123 read_lock(&sk->sk_callback_lock);
1124 if (!(xprt = xprt_from_sock(sk)))
1125 goto out;
1126 if (xprt->shutdown)
1127 goto out;
1128
1129 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1130 rd_desc.arg.data = xprt;
1131 do {
1132 rd_desc.count = 65536;
1133 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1134 } while (read > 0);
1135 out:
1136 read_unlock(&sk->sk_callback_lock);
1137 }
1138
1139 /*
1140 * Do the equivalent of linger/linger2 handling for dealing with
1141 * broken servers that don't close the socket in a timely
1142 * fashion
1143 */
1144 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1145 unsigned long timeout)
1146 {
1147 struct sock_xprt *transport;
1148
1149 if (xprt_test_and_set_connecting(xprt))
1150 return;
1151 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1152 transport = container_of(xprt, struct sock_xprt, xprt);
1153 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1154 timeout);
1155 }
1156
1157 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1158 {
1159 struct sock_xprt *transport;
1160
1161 transport = container_of(xprt, struct sock_xprt, xprt);
1162
1163 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1164 !cancel_delayed_work(&transport->connect_worker))
1165 return;
1166 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1167 xprt_clear_connecting(xprt);
1168 }
1169
1170 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1171 {
1172 smp_mb__before_clear_bit();
1173 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1174 clear_bit(XPRT_CLOSING, &xprt->state);
1175 smp_mb__after_clear_bit();
1176 /* Mark transport as closed and wake up all pending tasks */
1177 xprt_disconnect_done(xprt);
1178 }
1179
1180 /**
1181 * xs_tcp_state_change - callback to handle TCP socket state changes
1182 * @sk: socket whose state has changed
1183 *
1184 */
1185 static void xs_tcp_state_change(struct sock *sk)
1186 {
1187 struct rpc_xprt *xprt;
1188
1189 read_lock(&sk->sk_callback_lock);
1190 if (!(xprt = xprt_from_sock(sk)))
1191 goto out;
1192 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1193 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1194 sk->sk_state, xprt_connected(xprt),
1195 sock_flag(sk, SOCK_DEAD),
1196 sock_flag(sk, SOCK_ZAPPED));
1197
1198 switch (sk->sk_state) {
1199 case TCP_ESTABLISHED:
1200 spin_lock_bh(&xprt->transport_lock);
1201 if (!xprt_test_and_set_connected(xprt)) {
1202 struct sock_xprt *transport = container_of(xprt,
1203 struct sock_xprt, xprt);
1204
1205 /* Reset TCP record info */
1206 transport->tcp_offset = 0;
1207 transport->tcp_reclen = 0;
1208 transport->tcp_copied = 0;
1209 transport->tcp_flags =
1210 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1211
1212 xprt_wake_pending_tasks(xprt, -EAGAIN);
1213 }
1214 spin_unlock_bh(&xprt->transport_lock);
1215 break;
1216 case TCP_FIN_WAIT1:
1217 /* The client initiated a shutdown of the socket */
1218 xprt->connect_cookie++;
1219 xprt->reestablish_timeout = 0;
1220 set_bit(XPRT_CLOSING, &xprt->state);
1221 smp_mb__before_clear_bit();
1222 clear_bit(XPRT_CONNECTED, &xprt->state);
1223 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1224 smp_mb__after_clear_bit();
1225 xs_tcp_schedule_linger_timeout(xprt, XS_TCP_LINGER_TO);
1226 break;
1227 case TCP_CLOSE_WAIT:
1228 /* The server initiated a shutdown of the socket */
1229 xprt_force_disconnect(xprt);
1230 case TCP_SYN_SENT:
1231 xprt->connect_cookie++;
1232 case TCP_CLOSING:
1233 /*
1234 * If the server closed down the connection, make sure that
1235 * we back off before reconnecting
1236 */
1237 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1238 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1239 break;
1240 case TCP_LAST_ACK:
1241 set_bit(XPRT_CLOSING, &xprt->state);
1242 xs_tcp_schedule_linger_timeout(xprt, XS_TCP_LINGER_TO);
1243 smp_mb__before_clear_bit();
1244 clear_bit(XPRT_CONNECTED, &xprt->state);
1245 smp_mb__after_clear_bit();
1246 break;
1247 case TCP_CLOSE:
1248 xs_tcp_cancel_linger_timeout(xprt);
1249 xs_sock_mark_closed(xprt);
1250 }
1251 out:
1252 read_unlock(&sk->sk_callback_lock);
1253 }
1254
1255 /**
1256 * xs_error_report - callback mainly for catching socket errors
1257 * @sk: socket
1258 */
1259 static void xs_error_report(struct sock *sk)
1260 {
1261 struct rpc_xprt *xprt;
1262
1263 read_lock(&sk->sk_callback_lock);
1264 if (!(xprt = xprt_from_sock(sk)))
1265 goto out;
1266 dprintk("RPC: %s client %p...\n"
1267 "RPC: error %d\n",
1268 __func__, xprt, sk->sk_err);
1269 xprt_wake_pending_tasks(xprt, -EAGAIN);
1270 out:
1271 read_unlock(&sk->sk_callback_lock);
1272 }
1273
1274 /**
1275 * xs_udp_write_space - callback invoked when socket buffer space
1276 * becomes available
1277 * @sk: socket whose state has changed
1278 *
1279 * Called when more output buffer space is available for this socket.
1280 * We try not to wake our writers until they can make "significant"
1281 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1282 * with a bunch of small requests.
1283 */
1284 static void xs_udp_write_space(struct sock *sk)
1285 {
1286 read_lock(&sk->sk_callback_lock);
1287
1288 /* from net/core/sock.c:sock_def_write_space */
1289 if (sock_writeable(sk)) {
1290 struct socket *sock;
1291 struct rpc_xprt *xprt;
1292
1293 if (unlikely(!(sock = sk->sk_socket)))
1294 goto out;
1295 clear_bit(SOCK_NOSPACE, &sock->flags);
1296
1297 if (unlikely(!(xprt = xprt_from_sock(sk))))
1298 goto out;
1299 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1300 goto out;
1301
1302 xprt_write_space(xprt);
1303 }
1304
1305 out:
1306 read_unlock(&sk->sk_callback_lock);
1307 }
1308
1309 /**
1310 * xs_tcp_write_space - callback invoked when socket buffer space
1311 * becomes available
1312 * @sk: socket whose state has changed
1313 *
1314 * Called when more output buffer space is available for this socket.
1315 * We try not to wake our writers until they can make "significant"
1316 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1317 * with a bunch of small requests.
1318 */
1319 static void xs_tcp_write_space(struct sock *sk)
1320 {
1321 read_lock(&sk->sk_callback_lock);
1322
1323 /* from net/core/stream.c:sk_stream_write_space */
1324 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1325 struct socket *sock;
1326 struct rpc_xprt *xprt;
1327
1328 if (unlikely(!(sock = sk->sk_socket)))
1329 goto out;
1330 clear_bit(SOCK_NOSPACE, &sock->flags);
1331
1332 if (unlikely(!(xprt = xprt_from_sock(sk))))
1333 goto out;
1334 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1335 goto out;
1336
1337 xprt_write_space(xprt);
1338 }
1339
1340 out:
1341 read_unlock(&sk->sk_callback_lock);
1342 }
1343
1344 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1345 {
1346 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1347 struct sock *sk = transport->inet;
1348
1349 if (transport->rcvsize) {
1350 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1351 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1352 }
1353 if (transport->sndsize) {
1354 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1355 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1356 sk->sk_write_space(sk);
1357 }
1358 }
1359
1360 /**
1361 * xs_udp_set_buffer_size - set send and receive limits
1362 * @xprt: generic transport
1363 * @sndsize: requested size of send buffer, in bytes
1364 * @rcvsize: requested size of receive buffer, in bytes
1365 *
1366 * Set socket send and receive buffer size limits.
1367 */
1368 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1369 {
1370 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1371
1372 transport->sndsize = 0;
1373 if (sndsize)
1374 transport->sndsize = sndsize + 1024;
1375 transport->rcvsize = 0;
1376 if (rcvsize)
1377 transport->rcvsize = rcvsize + 1024;
1378
1379 xs_udp_do_set_buffer_size(xprt);
1380 }
1381
1382 /**
1383 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1384 * @task: task that timed out
1385 *
1386 * Adjust the congestion window after a retransmit timeout has occurred.
1387 */
1388 static void xs_udp_timer(struct rpc_task *task)
1389 {
1390 xprt_adjust_cwnd(task, -ETIMEDOUT);
1391 }
1392
1393 static unsigned short xs_get_random_port(void)
1394 {
1395 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1396 unsigned short rand = (unsigned short) net_random() % range;
1397 return rand + xprt_min_resvport;
1398 }
1399
1400 /**
1401 * xs_set_port - reset the port number in the remote endpoint address
1402 * @xprt: generic transport
1403 * @port: new port number
1404 *
1405 */
1406 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1407 {
1408 struct sockaddr *addr = xs_addr(xprt);
1409
1410 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1411
1412 switch (addr->sa_family) {
1413 case AF_INET:
1414 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1415 break;
1416 case AF_INET6:
1417 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1418 break;
1419 default:
1420 BUG();
1421 }
1422 }
1423
1424 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1425 {
1426 unsigned short port = transport->port;
1427
1428 if (port == 0 && transport->xprt.resvport)
1429 port = xs_get_random_port();
1430 return port;
1431 }
1432
1433 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1434 {
1435 if (transport->port != 0)
1436 transport->port = 0;
1437 if (!transport->xprt.resvport)
1438 return 0;
1439 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1440 return xprt_max_resvport;
1441 return --port;
1442 }
1443
1444 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1445 {
1446 struct sockaddr_in myaddr = {
1447 .sin_family = AF_INET,
1448 };
1449 struct sockaddr_in *sa;
1450 int err, nloop = 0;
1451 unsigned short port = xs_get_srcport(transport, sock);
1452 unsigned short last;
1453
1454 sa = (struct sockaddr_in *)&transport->addr;
1455 myaddr.sin_addr = sa->sin_addr;
1456 do {
1457 myaddr.sin_port = htons(port);
1458 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1459 sizeof(myaddr));
1460 if (port == 0)
1461 break;
1462 if (err == 0) {
1463 transport->port = port;
1464 break;
1465 }
1466 last = port;
1467 port = xs_next_srcport(transport, sock, port);
1468 if (port > last)
1469 nloop++;
1470 } while (err == -EADDRINUSE && nloop != 2);
1471 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1472 __func__, &myaddr.sin_addr,
1473 port, err ? "failed" : "ok", err);
1474 return err;
1475 }
1476
1477 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1478 {
1479 struct sockaddr_in6 myaddr = {
1480 .sin6_family = AF_INET6,
1481 };
1482 struct sockaddr_in6 *sa;
1483 int err, nloop = 0;
1484 unsigned short port = xs_get_srcport(transport, sock);
1485 unsigned short last;
1486
1487 sa = (struct sockaddr_in6 *)&transport->addr;
1488 myaddr.sin6_addr = sa->sin6_addr;
1489 do {
1490 myaddr.sin6_port = htons(port);
1491 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1492 sizeof(myaddr));
1493 if (port == 0)
1494 break;
1495 if (err == 0) {
1496 transport->port = port;
1497 break;
1498 }
1499 last = port;
1500 port = xs_next_srcport(transport, sock, port);
1501 if (port > last)
1502 nloop++;
1503 } while (err == -EADDRINUSE && nloop != 2);
1504 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1505 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1506 return err;
1507 }
1508
1509 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1510 static struct lock_class_key xs_key[2];
1511 static struct lock_class_key xs_slock_key[2];
1512
1513 static inline void xs_reclassify_socket4(struct socket *sock)
1514 {
1515 struct sock *sk = sock->sk;
1516
1517 BUG_ON(sock_owned_by_user(sk));
1518 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1519 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1520 }
1521
1522 static inline void xs_reclassify_socket6(struct socket *sock)
1523 {
1524 struct sock *sk = sock->sk;
1525
1526 BUG_ON(sock_owned_by_user(sk));
1527 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1528 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1529 }
1530 #else
1531 static inline void xs_reclassify_socket4(struct socket *sock)
1532 {
1533 }
1534
1535 static inline void xs_reclassify_socket6(struct socket *sock)
1536 {
1537 }
1538 #endif
1539
1540 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1541 {
1542 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1543
1544 if (!transport->inet) {
1545 struct sock *sk = sock->sk;
1546
1547 write_lock_bh(&sk->sk_callback_lock);
1548
1549 xs_save_old_callbacks(transport, sk);
1550
1551 sk->sk_user_data = xprt;
1552 sk->sk_data_ready = xs_udp_data_ready;
1553 sk->sk_write_space = xs_udp_write_space;
1554 sk->sk_error_report = xs_error_report;
1555 sk->sk_no_check = UDP_CSUM_NORCV;
1556 sk->sk_allocation = GFP_ATOMIC;
1557
1558 xprt_set_connected(xprt);
1559
1560 /* Reset to new socket */
1561 transport->sock = sock;
1562 transport->inet = sk;
1563
1564 write_unlock_bh(&sk->sk_callback_lock);
1565 }
1566 xs_udp_do_set_buffer_size(xprt);
1567 }
1568
1569 /**
1570 * xs_udp_connect_worker4 - 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_worker4(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_INET, 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_socket4(sock);
1595
1596 if (xs_bind4(transport, sock)) {
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_clear_connecting(xprt);
1608 xprt_wake_pending_tasks(xprt, status);
1609 }
1610
1611 /**
1612 * xs_udp_connect_worker6 - set up a UDP socket
1613 * @work: RPC transport to connect
1614 *
1615 * Invoked by a work queue tasklet.
1616 */
1617 static void xs_udp_connect_worker6(struct work_struct *work)
1618 {
1619 struct sock_xprt *transport =
1620 container_of(work, struct sock_xprt, connect_worker.work);
1621 struct rpc_xprt *xprt = &transport->xprt;
1622 struct socket *sock = transport->sock;
1623 int err, status = -EIO;
1624
1625 if (xprt->shutdown)
1626 goto out;
1627
1628 /* Start by resetting any existing state */
1629 xs_reset_transport(transport);
1630
1631 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1632 if (err < 0) {
1633 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1634 goto out;
1635 }
1636 xs_reclassify_socket6(sock);
1637
1638 if (xs_bind6(transport, sock) < 0) {
1639 sock_release(sock);
1640 goto out;
1641 }
1642
1643 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1644 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1645
1646 xs_udp_finish_connecting(xprt, sock);
1647 status = 0;
1648 out:
1649 xprt_clear_connecting(xprt);
1650 xprt_wake_pending_tasks(xprt, status);
1651 }
1652
1653 /*
1654 * We need to preserve the port number so the reply cache on the server can
1655 * find our cached RPC replies when we get around to reconnecting.
1656 */
1657 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1658 {
1659 int result;
1660 struct sockaddr any;
1661
1662 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1663
1664 /*
1665 * Disconnect the transport socket by doing a connect operation
1666 * with AF_UNSPEC. This should return immediately...
1667 */
1668 memset(&any, 0, sizeof(any));
1669 any.sa_family = AF_UNSPEC;
1670 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1671 if (!result)
1672 xs_sock_mark_closed(xprt);
1673 else
1674 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1675 result);
1676 }
1677
1678 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1679 {
1680 unsigned int state = transport->inet->sk_state;
1681
1682 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1683 return;
1684 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1685 return;
1686 xs_abort_connection(xprt, transport);
1687 }
1688
1689 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1690 {
1691 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1692
1693 if (!transport->inet) {
1694 struct sock *sk = sock->sk;
1695
1696 write_lock_bh(&sk->sk_callback_lock);
1697
1698 xs_save_old_callbacks(transport, sk);
1699
1700 sk->sk_user_data = xprt;
1701 sk->sk_data_ready = xs_tcp_data_ready;
1702 sk->sk_state_change = xs_tcp_state_change;
1703 sk->sk_write_space = xs_tcp_write_space;
1704 sk->sk_error_report = xs_error_report;
1705 sk->sk_allocation = GFP_ATOMIC;
1706
1707 /* socket options */
1708 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1709 sock_reset_flag(sk, SOCK_LINGER);
1710 tcp_sk(sk)->linger2 = 0;
1711 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1712
1713 xprt_clear_connected(xprt);
1714
1715 /* Reset to new socket */
1716 transport->sock = sock;
1717 transport->inet = sk;
1718
1719 write_unlock_bh(&sk->sk_callback_lock);
1720 }
1721
1722 if (!xprt_bound(xprt))
1723 return -ENOTCONN;
1724
1725 /* Tell the socket layer to start connecting... */
1726 xprt->stat.connect_count++;
1727 xprt->stat.connect_start = jiffies;
1728 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1729 }
1730
1731 /**
1732 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1733 * @work: RPC transport to connect
1734 *
1735 * Invoked by a work queue tasklet.
1736 */
1737 static void xs_tcp_connect_worker4(struct work_struct *work)
1738 {
1739 struct sock_xprt *transport =
1740 container_of(work, struct sock_xprt, connect_worker.work);
1741 struct rpc_xprt *xprt = &transport->xprt;
1742 struct socket *sock = transport->sock;
1743 int err, status = -EIO;
1744
1745 if (xprt->shutdown)
1746 goto out;
1747
1748 if (!sock) {
1749 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1750 /* start from scratch */
1751 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1752 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1753 goto out;
1754 }
1755 xs_reclassify_socket4(sock);
1756
1757 if (xs_bind4(transport, sock) < 0) {
1758 sock_release(sock);
1759 goto out;
1760 }
1761 } else {
1762 int abort_and_exit;
1763
1764 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1765 &xprt->state);
1766 /* "close" the socket, preserving the local port */
1767 xs_tcp_reuse_connection(xprt, transport);
1768
1769 if (abort_and_exit)
1770 goto out_eagain;
1771 }
1772
1773 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1774 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1775
1776 status = xs_tcp_finish_connecting(xprt, sock);
1777 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1778 xprt, -status, xprt_connected(xprt),
1779 sock->sk->sk_state);
1780 switch (status) {
1781 case -ECONNREFUSED:
1782 case -ECONNRESET:
1783 case -ENETUNREACH:
1784 /* retry with existing socket, after a delay */
1785 case 0:
1786 case -EINPROGRESS:
1787 case -EALREADY:
1788 xprt_clear_connecting(xprt);
1789 return;
1790 }
1791 /* get rid of existing socket, and retry */
1792 xs_tcp_shutdown(xprt);
1793 printk("%s: connect returned unhandled error %d\n",
1794 __func__, status);
1795 out_eagain:
1796 status = -EAGAIN;
1797 out:
1798 xprt_clear_connecting(xprt);
1799 xprt_wake_pending_tasks(xprt, status);
1800 }
1801
1802 /**
1803 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1804 * @work: RPC transport to connect
1805 *
1806 * Invoked by a work queue tasklet.
1807 */
1808 static void xs_tcp_connect_worker6(struct work_struct *work)
1809 {
1810 struct sock_xprt *transport =
1811 container_of(work, struct sock_xprt, connect_worker.work);
1812 struct rpc_xprt *xprt = &transport->xprt;
1813 struct socket *sock = transport->sock;
1814 int err, status = -EIO;
1815
1816 if (xprt->shutdown)
1817 goto out;
1818
1819 if (!sock) {
1820 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1821 /* start from scratch */
1822 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1823 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1824 goto out;
1825 }
1826 xs_reclassify_socket6(sock);
1827
1828 if (xs_bind6(transport, sock) < 0) {
1829 sock_release(sock);
1830 goto out;
1831 }
1832 } else {
1833 int abort_and_exit;
1834
1835 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1836 &xprt->state);
1837 /* "close" the socket, preserving the local port */
1838 xs_tcp_reuse_connection(xprt, transport);
1839
1840 if (abort_and_exit)
1841 goto out_eagain;
1842 }
1843
1844 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1845 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1846
1847 status = xs_tcp_finish_connecting(xprt, sock);
1848 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1849 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1850 switch (status) {
1851 case -ECONNREFUSED:
1852 case -ECONNRESET:
1853 case -ENETUNREACH:
1854 /* retry with existing socket, after a delay */
1855 case 0:
1856 case -EINPROGRESS:
1857 case -EALREADY:
1858 xprt_clear_connecting(xprt);
1859 return;
1860 }
1861 /* get rid of existing socket, and retry */
1862 xs_tcp_shutdown(xprt);
1863 printk("%s: connect returned unhandled error %d\n",
1864 __func__, status);
1865 out_eagain:
1866 status = -EAGAIN;
1867 out:
1868 xprt_clear_connecting(xprt);
1869 xprt_wake_pending_tasks(xprt, status);
1870 }
1871
1872 /**
1873 * xs_connect - connect a socket to a remote endpoint
1874 * @task: address of RPC task that manages state of connect request
1875 *
1876 * TCP: If the remote end dropped the connection, delay reconnecting.
1877 *
1878 * UDP socket connects are synchronous, but we use a work queue anyway
1879 * to guarantee that even unprivileged user processes can set up a
1880 * socket on a privileged port.
1881 *
1882 * If a UDP socket connect fails, the delay behavior here prevents
1883 * retry floods (hard mounts).
1884 */
1885 static void xs_connect(struct rpc_task *task)
1886 {
1887 struct rpc_xprt *xprt = task->tk_xprt;
1888 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1889
1890 if (xprt_test_and_set_connecting(xprt))
1891 return;
1892
1893 if (transport->sock != NULL) {
1894 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1895 "seconds\n",
1896 xprt, xprt->reestablish_timeout / HZ);
1897 queue_delayed_work(rpciod_workqueue,
1898 &transport->connect_worker,
1899 xprt->reestablish_timeout);
1900 xprt->reestablish_timeout <<= 1;
1901 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1902 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1903 } else {
1904 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1905 queue_delayed_work(rpciod_workqueue,
1906 &transport->connect_worker, 0);
1907 }
1908 }
1909
1910 static void xs_tcp_connect(struct rpc_task *task)
1911 {
1912 struct rpc_xprt *xprt = task->tk_xprt;
1913
1914 /* Exit if we need to wait for socket shutdown to complete */
1915 if (test_bit(XPRT_CLOSING, &xprt->state))
1916 return;
1917 xs_connect(task);
1918 }
1919
1920 /**
1921 * xs_udp_print_stats - display UDP socket-specifc stats
1922 * @xprt: rpc_xprt struct containing statistics
1923 * @seq: output file
1924 *
1925 */
1926 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1927 {
1928 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1929
1930 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1931 transport->port,
1932 xprt->stat.bind_count,
1933 xprt->stat.sends,
1934 xprt->stat.recvs,
1935 xprt->stat.bad_xids,
1936 xprt->stat.req_u,
1937 xprt->stat.bklog_u);
1938 }
1939
1940 /**
1941 * xs_tcp_print_stats - display TCP socket-specifc stats
1942 * @xprt: rpc_xprt struct containing statistics
1943 * @seq: output file
1944 *
1945 */
1946 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1947 {
1948 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1949 long idle_time = 0;
1950
1951 if (xprt_connected(xprt))
1952 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1953
1954 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1955 transport->port,
1956 xprt->stat.bind_count,
1957 xprt->stat.connect_count,
1958 xprt->stat.connect_time,
1959 idle_time,
1960 xprt->stat.sends,
1961 xprt->stat.recvs,
1962 xprt->stat.bad_xids,
1963 xprt->stat.req_u,
1964 xprt->stat.bklog_u);
1965 }
1966
1967 static struct rpc_xprt_ops xs_udp_ops = {
1968 .set_buffer_size = xs_udp_set_buffer_size,
1969 .reserve_xprt = xprt_reserve_xprt_cong,
1970 .release_xprt = xprt_release_xprt_cong,
1971 .rpcbind = rpcb_getport_async,
1972 .set_port = xs_set_port,
1973 .connect = xs_connect,
1974 .buf_alloc = rpc_malloc,
1975 .buf_free = rpc_free,
1976 .send_request = xs_udp_send_request,
1977 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1978 .timer = xs_udp_timer,
1979 .release_request = xprt_release_rqst_cong,
1980 .close = xs_close,
1981 .destroy = xs_destroy,
1982 .print_stats = xs_udp_print_stats,
1983 };
1984
1985 static struct rpc_xprt_ops xs_tcp_ops = {
1986 .reserve_xprt = xprt_reserve_xprt,
1987 .release_xprt = xs_tcp_release_xprt,
1988 .rpcbind = rpcb_getport_async,
1989 .set_port = xs_set_port,
1990 .connect = xs_tcp_connect,
1991 .buf_alloc = rpc_malloc,
1992 .buf_free = rpc_free,
1993 .send_request = xs_tcp_send_request,
1994 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1995 .close = xs_tcp_shutdown,
1996 .destroy = xs_destroy,
1997 .print_stats = xs_tcp_print_stats,
1998 };
1999
2000 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2001 unsigned int slot_table_size)
2002 {
2003 struct rpc_xprt *xprt;
2004 struct sock_xprt *new;
2005
2006 if (args->addrlen > sizeof(xprt->addr)) {
2007 dprintk("RPC: xs_setup_xprt: address too large\n");
2008 return ERR_PTR(-EBADF);
2009 }
2010
2011 new = kzalloc(sizeof(*new), GFP_KERNEL);
2012 if (new == NULL) {
2013 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2014 "rpc_xprt\n");
2015 return ERR_PTR(-ENOMEM);
2016 }
2017 xprt = &new->xprt;
2018
2019 xprt->max_reqs = slot_table_size;
2020 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2021 if (xprt->slot == NULL) {
2022 kfree(xprt);
2023 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2024 "table\n");
2025 return ERR_PTR(-ENOMEM);
2026 }
2027
2028 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2029 xprt->addrlen = args->addrlen;
2030 if (args->srcaddr)
2031 memcpy(&new->addr, args->srcaddr, args->addrlen);
2032
2033 return xprt;
2034 }
2035
2036 static const struct rpc_timeout xs_udp_default_timeout = {
2037 .to_initval = 5 * HZ,
2038 .to_maxval = 30 * HZ,
2039 .to_increment = 5 * HZ,
2040 .to_retries = 5,
2041 };
2042
2043 /**
2044 * xs_setup_udp - Set up transport to use a UDP socket
2045 * @args: rpc transport creation arguments
2046 *
2047 */
2048 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2049 {
2050 struct sockaddr *addr = args->dstaddr;
2051 struct rpc_xprt *xprt;
2052 struct sock_xprt *transport;
2053
2054 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2055 if (IS_ERR(xprt))
2056 return xprt;
2057 transport = container_of(xprt, struct sock_xprt, xprt);
2058
2059 xprt->prot = IPPROTO_UDP;
2060 xprt->tsh_size = 0;
2061 /* XXX: header size can vary due to auth type, IPv6, etc. */
2062 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2063
2064 xprt->bind_timeout = XS_BIND_TO;
2065 xprt->connect_timeout = XS_UDP_CONN_TO;
2066 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2067 xprt->idle_timeout = XS_IDLE_DISC_TO;
2068
2069 xprt->ops = &xs_udp_ops;
2070
2071 xprt->timeout = &xs_udp_default_timeout;
2072
2073 switch (addr->sa_family) {
2074 case AF_INET:
2075 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2076 xprt_set_bound(xprt);
2077
2078 INIT_DELAYED_WORK(&transport->connect_worker,
2079 xs_udp_connect_worker4);
2080 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2081 break;
2082 case AF_INET6:
2083 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2084 xprt_set_bound(xprt);
2085
2086 INIT_DELAYED_WORK(&transport->connect_worker,
2087 xs_udp_connect_worker6);
2088 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2089 break;
2090 default:
2091 kfree(xprt);
2092 return ERR_PTR(-EAFNOSUPPORT);
2093 }
2094
2095 dprintk("RPC: set up transport to address %s\n",
2096 xprt->address_strings[RPC_DISPLAY_ALL]);
2097
2098 if (try_module_get(THIS_MODULE))
2099 return xprt;
2100
2101 kfree(xprt->slot);
2102 kfree(xprt);
2103 return ERR_PTR(-EINVAL);
2104 }
2105
2106 static const struct rpc_timeout xs_tcp_default_timeout = {
2107 .to_initval = 60 * HZ,
2108 .to_maxval = 60 * HZ,
2109 .to_retries = 2,
2110 };
2111
2112 /**
2113 * xs_setup_tcp - Set up transport to use a TCP socket
2114 * @args: rpc transport creation arguments
2115 *
2116 */
2117 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2118 {
2119 struct sockaddr *addr = args->dstaddr;
2120 struct rpc_xprt *xprt;
2121 struct sock_xprt *transport;
2122
2123 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2124 if (IS_ERR(xprt))
2125 return xprt;
2126 transport = container_of(xprt, struct sock_xprt, xprt);
2127
2128 xprt->prot = IPPROTO_TCP;
2129 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2130 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2131
2132 xprt->bind_timeout = XS_BIND_TO;
2133 xprt->connect_timeout = XS_TCP_CONN_TO;
2134 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2135 xprt->idle_timeout = XS_IDLE_DISC_TO;
2136
2137 xprt->ops = &xs_tcp_ops;
2138 xprt->timeout = &xs_tcp_default_timeout;
2139
2140 switch (addr->sa_family) {
2141 case AF_INET:
2142 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2143 xprt_set_bound(xprt);
2144
2145 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2146 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2147 break;
2148 case AF_INET6:
2149 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2150 xprt_set_bound(xprt);
2151
2152 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2153 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2154 break;
2155 default:
2156 kfree(xprt);
2157 return ERR_PTR(-EAFNOSUPPORT);
2158 }
2159
2160 dprintk("RPC: set up transport to address %s\n",
2161 xprt->address_strings[RPC_DISPLAY_ALL]);
2162
2163 if (try_module_get(THIS_MODULE))
2164 return xprt;
2165
2166 kfree(xprt->slot);
2167 kfree(xprt);
2168 return ERR_PTR(-EINVAL);
2169 }
2170
2171 static struct xprt_class xs_udp_transport = {
2172 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2173 .name = "udp",
2174 .owner = THIS_MODULE,
2175 .ident = IPPROTO_UDP,
2176 .setup = xs_setup_udp,
2177 };
2178
2179 static struct xprt_class xs_tcp_transport = {
2180 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2181 .name = "tcp",
2182 .owner = THIS_MODULE,
2183 .ident = IPPROTO_TCP,
2184 .setup = xs_setup_tcp,
2185 };
2186
2187 /**
2188 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2189 *
2190 */
2191 int init_socket_xprt(void)
2192 {
2193 #ifdef RPC_DEBUG
2194 if (!sunrpc_table_header)
2195 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2196 #endif
2197
2198 xprt_register_transport(&xs_udp_transport);
2199 xprt_register_transport(&xs_tcp_transport);
2200
2201 return 0;
2202 }
2203
2204 /**
2205 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2206 *
2207 */
2208 void cleanup_socket_xprt(void)
2209 {
2210 #ifdef RPC_DEBUG
2211 if (sunrpc_table_header) {
2212 unregister_sysctl_table(sunrpc_table_header);
2213 sunrpc_table_header = NULL;
2214 }
2215 #endif
2216
2217 xprt_unregister_transport(&xs_udp_transport);
2218 xprt_unregister_transport(&xs_tcp_transport);
2219 }
ubuntu-bionic-kernel mirror