projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
SUNRPC: rename the rpc_xprtsock_create structure
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/file.h>
36
37 #include <net/sock.h>
38 #include <net/checksum.h>
39 #include <net/udp.h>
40 #include <net/tcp.h>
41
42 /*
43 * xprtsock tunables
44 */
45 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
46 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47
48 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
49 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
50
51 /*
52 * We can register our own files under /proc/sys/sunrpc by
53 * calling register_sysctl_table() again. The files in that
54 * directory become the union of all files registered there.
55 *
56 * We simply need to make sure that we don't collide with
57 * someone else's file names!
58 */
59
60 #ifdef RPC_DEBUG
61
62 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
63 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
64 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
65 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
66
67 static struct ctl_table_header *sunrpc_table_header;
68
69 /*
70 * FIXME: changing the UDP slot table size should also resize the UDP
71 * socket buffers for existing UDP transports
72 */
73 static ctl_table xs_tunables_table[] = {
74 {
75 .ctl_name = CTL_SLOTTABLE_UDP,
76 .procname = "udp_slot_table_entries",
77 .data = &xprt_udp_slot_table_entries,
78 .maxlen = sizeof(unsigned int),
79 .mode = 0644,
80 .proc_handler = &proc_dointvec_minmax,
81 .strategy = &sysctl_intvec,
82 .extra1 = &min_slot_table_size,
83 .extra2 = &max_slot_table_size
84 },
85 {
86 .ctl_name = CTL_SLOTTABLE_TCP,
87 .procname = "tcp_slot_table_entries",
88 .data = &xprt_tcp_slot_table_entries,
89 .maxlen = sizeof(unsigned int),
90 .mode = 0644,
91 .proc_handler = &proc_dointvec_minmax,
92 .strategy = &sysctl_intvec,
93 .extra1 = &min_slot_table_size,
94 .extra2 = &max_slot_table_size
95 },
96 {
97 .ctl_name = CTL_MIN_RESVPORT,
98 .procname = "min_resvport",
99 .data = &xprt_min_resvport,
100 .maxlen = sizeof(unsigned int),
101 .mode = 0644,
102 .proc_handler = &proc_dointvec_minmax,
103 .strategy = &sysctl_intvec,
104 .extra1 = &xprt_min_resvport_limit,
105 .extra2 = &xprt_max_resvport_limit
106 },
107 {
108 .ctl_name = CTL_MAX_RESVPORT,
109 .procname = "max_resvport",
110 .data = &xprt_max_resvport,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = &proc_dointvec_minmax,
114 .strategy = &sysctl_intvec,
115 .extra1 = &xprt_min_resvport_limit,
116 .extra2 = &xprt_max_resvport_limit
117 },
118 {
119 .ctl_name = 0,
120 },
121 };
122
123 static ctl_table sunrpc_table[] = {
124 {
125 .ctl_name = CTL_SUNRPC,
126 .procname = "sunrpc",
127 .mode = 0555,
128 .child = xs_tunables_table
129 },
130 {
131 .ctl_name = 0,
132 },
133 };
134
135 #endif
136
137 /*
138 * How many times to try sending a request on a socket before waiting
139 * for the socket buffer to clear.
140 */
141 #define XS_SENDMSG_RETRY (10U)
142
143 /*
144 * Time out for an RPC UDP socket connect. UDP socket connects are
145 * synchronous, but we set a timeout anyway in case of resource
146 * exhaustion on the local host.
147 */
148 #define XS_UDP_CONN_TO (5U * HZ)
149
150 /*
151 * Wait duration for an RPC TCP connection to be established. Solaris
152 * NFS over TCP uses 60 seconds, for example, which is in line with how
153 * long a server takes to reboot.
154 */
155 #define XS_TCP_CONN_TO (60U * HZ)
156
157 /*
158 * Wait duration for a reply from the RPC portmapper.
159 */
160 #define XS_BIND_TO (60U * HZ)
161
162 /*
163 * Delay if a UDP socket connect error occurs. This is most likely some
164 * kind of resource problem on the local host.
165 */
166 #define XS_UDP_REEST_TO (2U * HZ)
167
168 /*
169 * The reestablish timeout allows clients to delay for a bit before attempting
170 * to reconnect to a server that just dropped our connection.
171 *
172 * We implement an exponential backoff when trying to reestablish a TCP
173 * transport connection with the server. Some servers like to drop a TCP
174 * connection when they are overworked, so we start with a short timeout and
175 * increase over time if the server is down or not responding.
176 */
177 #define XS_TCP_INIT_REEST_TO (3U * HZ)
178 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
179
180 /*
181 * TCP idle timeout; client drops the transport socket if it is idle
182 * for this long. Note that we also timeout UDP sockets to prevent
183 * holding port numbers when there is no RPC traffic.
184 */
185 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
186
187 #ifdef RPC_DEBUG
188 # undef RPC_DEBUG_DATA
189 # define RPCDBG_FACILITY RPCDBG_TRANS
190 #endif
191
192 #ifdef RPC_DEBUG_DATA
193 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
194 {
195 u8 *buf = (u8 *) packet;
196 int j;
197
198 dprintk("RPC: %s\n", msg);
199 for (j = 0; j < count && j < 128; j += 4) {
200 if (!(j & 31)) {
201 if (j)
202 dprintk("\n");
203 dprintk("0x%04x ", j);
204 }
205 dprintk("%02x%02x%02x%02x ",
206 buf[j], buf[j+1], buf[j+2], buf[j+3]);
207 }
208 dprintk("\n");
209 }
210 #else
211 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
212 {
213 /* NOP */
214 }
215 #endif
216
217 struct sock_xprt {
218 struct rpc_xprt xprt;
219
220 /*
221 * Network layer
222 */
223 struct socket * sock;
224 struct sock * inet;
225
226 /*
227 * State of TCP reply receive
228 */
229 __be32 tcp_fraghdr,
230 tcp_xid;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage addr;
243 unsigned short port;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 };
258
259 /*
260 * TCP receive state flags
261 */
262 #define TCP_RCV_LAST_FRAG (1UL << 0)
263 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
264 #define TCP_RCV_COPY_XID (1UL << 2)
265 #define TCP_RCV_COPY_DATA (1UL << 3)
266
267 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
268 {
269 return (struct sockaddr *) &xprt->addr;
270 }
271
272 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
273 {
274 return (struct sockaddr_in *) &xprt->addr;
275 }
276
277 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
278 {
279 return (struct sockaddr_in6 *) &xprt->addr;
280 }
281
282 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
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, NIPQUAD_FMT,
290 NIPQUAD(addr->sin_addr.s_addr));
291 }
292 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
293
294 buf = kzalloc(8, GFP_KERNEL);
295 if (buf) {
296 snprintf(buf, 8, "%u",
297 ntohs(addr->sin_port));
298 }
299 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
300
301 buf = kzalloc(8, GFP_KERNEL);
302 if (buf) {
303 if (xprt->prot == IPPROTO_UDP)
304 snprintf(buf, 8, "udp");
305 else
306 snprintf(buf, 8, "tcp");
307 }
308 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
309
310 buf = kzalloc(48, GFP_KERNEL);
311 if (buf) {
312 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
313 NIPQUAD(addr->sin_addr.s_addr),
314 ntohs(addr->sin_port),
315 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
316 }
317 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
318
319 buf = kzalloc(10, GFP_KERNEL);
320 if (buf) {
321 snprintf(buf, 10, "%02x%02x%02x%02x",
322 NIPQUAD(addr->sin_addr.s_addr));
323 }
324 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
325
326 buf = kzalloc(8, GFP_KERNEL);
327 if (buf) {
328 snprintf(buf, 8, "%4hx",
329 ntohs(addr->sin_port));
330 }
331 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
332
333 buf = kzalloc(30, GFP_KERNEL);
334 if (buf) {
335 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
336 NIPQUAD(addr->sin_addr.s_addr),
337 ntohs(addr->sin_port) >> 8,
338 ntohs(addr->sin_port) & 0xff);
339 }
340 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
341
342 xprt->address_strings[RPC_DISPLAY_NETID] =
343 kstrdup(xprt->prot == IPPROTO_UDP ?
344 RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL);
345 }
346
347 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
348 {
349 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
350 char *buf;
351
352 buf = kzalloc(40, GFP_KERNEL);
353 if (buf) {
354 snprintf(buf, 40, NIP6_FMT,
355 NIP6(addr->sin6_addr));
356 }
357 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
358
359 buf = kzalloc(8, GFP_KERNEL);
360 if (buf) {
361 snprintf(buf, 8, "%u",
362 ntohs(addr->sin6_port));
363 }
364 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
365
366 buf = kzalloc(8, GFP_KERNEL);
367 if (buf) {
368 if (xprt->prot == IPPROTO_UDP)
369 snprintf(buf, 8, "udp");
370 else
371 snprintf(buf, 8, "tcp");
372 }
373 xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
374
375 buf = kzalloc(64, GFP_KERNEL);
376 if (buf) {
377 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
378 NIP6(addr->sin6_addr),
379 ntohs(addr->sin6_port),
380 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
381 }
382 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
383
384 buf = kzalloc(36, GFP_KERNEL);
385 if (buf) {
386 snprintf(buf, 36, NIP6_SEQFMT,
387 NIP6(addr->sin6_addr));
388 }
389 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
390
391 buf = kzalloc(8, GFP_KERNEL);
392 if (buf) {
393 snprintf(buf, 8, "%4hx",
394 ntohs(addr->sin6_port));
395 }
396 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
397
398 buf = kzalloc(50, GFP_KERNEL);
399 if (buf) {
400 snprintf(buf, 50, NIP6_FMT".%u.%u",
401 NIP6(addr->sin6_addr),
402 ntohs(addr->sin6_port) >> 8,
403 ntohs(addr->sin6_port) & 0xff);
404 }
405 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
406
407 xprt->address_strings[RPC_DISPLAY_NETID] =
408 kstrdup(xprt->prot == IPPROTO_UDP ?
409 RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL);
410 }
411
412 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
413 {
414 int i;
415
416 for (i = 0; i < RPC_DISPLAY_MAX; i++)
417 kfree(xprt->address_strings[i]);
418 }
419
420 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
421
422 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
423 {
424 struct msghdr msg = {
425 .msg_name = addr,
426 .msg_namelen = addrlen,
427 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
428 };
429 struct kvec iov = {
430 .iov_base = vec->iov_base + base,
431 .iov_len = vec->iov_len - base,
432 };
433
434 if (iov.iov_len != 0)
435 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
436 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
437 }
438
439 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
440 {
441 struct page **ppage;
442 unsigned int remainder;
443 int err, sent = 0;
444
445 remainder = xdr->page_len - base;
446 base += xdr->page_base;
447 ppage = xdr->pages + (base >> PAGE_SHIFT);
448 base &= ~PAGE_MASK;
449 for(;;) {
450 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
451 int flags = XS_SENDMSG_FLAGS;
452
453 remainder -= len;
454 if (remainder != 0 || more)
455 flags |= MSG_MORE;
456 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
457 if (remainder == 0 || err != len)
458 break;
459 sent += err;
460 ppage++;
461 base = 0;
462 }
463 if (sent == 0)
464 return err;
465 if (err > 0)
466 sent += err;
467 return sent;
468 }
469
470 /**
471 * xs_sendpages - write pages directly to a socket
472 * @sock: socket to send on
473 * @addr: UDP only -- address of destination
474 * @addrlen: UDP only -- length of destination address
475 * @xdr: buffer containing this request
476 * @base: starting position in the buffer
477 *
478 */
479 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
480 {
481 unsigned int remainder = xdr->len - base;
482 int err, sent = 0;
483
484 if (unlikely(!sock))
485 return -ENOTCONN;
486
487 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
488 if (base != 0) {
489 addr = NULL;
490 addrlen = 0;
491 }
492
493 if (base < xdr->head[0].iov_len || addr != NULL) {
494 unsigned int len = xdr->head[0].iov_len - base;
495 remainder -= len;
496 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
497 if (remainder == 0 || err != len)
498 goto out;
499 sent += err;
500 base = 0;
501 } else
502 base -= xdr->head[0].iov_len;
503
504 if (base < xdr->page_len) {
505 unsigned int len = xdr->page_len - base;
506 remainder -= len;
507 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
508 if (remainder == 0 || err != len)
509 goto out;
510 sent += err;
511 base = 0;
512 } else
513 base -= xdr->page_len;
514
515 if (base >= xdr->tail[0].iov_len)
516 return sent;
517 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
518 out:
519 if (sent == 0)
520 return err;
521 if (err > 0)
522 sent += err;
523 return sent;
524 }
525
526 /**
527 * xs_nospace - place task on wait queue if transmit was incomplete
528 * @task: task to put to sleep
529 *
530 */
531 static void xs_nospace(struct rpc_task *task)
532 {
533 struct rpc_rqst *req = task->tk_rqstp;
534 struct rpc_xprt *xprt = req->rq_xprt;
535 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
536
537 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
538 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
539 req->rq_slen);
540
541 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
542 /* Protect against races with write_space */
543 spin_lock_bh(&xprt->transport_lock);
544
545 /* Don't race with disconnect */
546 if (!xprt_connected(xprt))
547 task->tk_status = -ENOTCONN;
548 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
549 xprt_wait_for_buffer_space(task);
550
551 spin_unlock_bh(&xprt->transport_lock);
552 } else
553 /* Keep holding the socket if it is blocked */
554 rpc_delay(task, HZ>>4);
555 }
556
557 /**
558 * xs_udp_send_request - write an RPC request to a UDP socket
559 * @task: address of RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568 static int xs_udp_send_request(struct rpc_task *task)
569 {
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
573 struct xdr_buf *xdr = &req->rq_snd_buf;
574 int status;
575
576 xs_pktdump("packet data:",
577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
580 req->rq_xtime = jiffies;
581 status = xs_sendpages(transport->sock,
582 xs_addr(xprt),
583 xprt->addrlen, xdr,
584 req->rq_bytes_sent);
585
586 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
587 xdr->len - req->rq_bytes_sent, status);
588
589 if (likely(status >= (int) req->rq_slen))
590 return 0;
591
592 /* Still some bytes left; set up for a retry later. */
593 if (status > 0)
594 status = -EAGAIN;
595
596 switch (status) {
597 case -ENETUNREACH:
598 case -EPIPE:
599 case -ECONNREFUSED:
600 /* When the server has died, an ICMP port unreachable message
601 * prompts ECONNREFUSED. */
602 break;
603 case -EAGAIN:
604 xs_nospace(task);
605 break;
606 default:
607 dprintk("RPC: sendmsg returned unrecognized error %d\n",
608 -status);
609 break;
610 }
611
612 return status;
613 }
614
615 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
616 {
617 u32 reclen = buf->len - sizeof(rpc_fraghdr);
618 rpc_fraghdr *base = buf->head[0].iov_base;
619 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
620 }
621
622 /**
623 * xs_tcp_send_request - write an RPC request to a TCP socket
624 * @task: address of RPC task that manages the state of an RPC request
625 *
626 * Return values:
627 * 0: The request has been sent
628 * EAGAIN: The socket was blocked, please call again later to
629 * complete the request
630 * ENOTCONN: Caller needs to invoke connect logic then call again
631 * other: Some other error occured, the request was not sent
632 *
633 * XXX: In the case of soft timeouts, should we eventually give up
634 * if sendmsg is not able to make progress?
635 */
636 static int xs_tcp_send_request(struct rpc_task *task)
637 {
638 struct rpc_rqst *req = task->tk_rqstp;
639 struct rpc_xprt *xprt = req->rq_xprt;
640 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
641 struct xdr_buf *xdr = &req->rq_snd_buf;
642 int status;
643 unsigned int retry = 0;
644
645 xs_encode_tcp_record_marker(&req->rq_snd_buf);
646
647 xs_pktdump("packet data:",
648 req->rq_svec->iov_base,
649 req->rq_svec->iov_len);
650
651 /* Continue transmitting the packet/record. We must be careful
652 * to cope with writespace callbacks arriving _after_ we have
653 * called sendmsg(). */
654 while (1) {
655 req->rq_xtime = jiffies;
656 status = xs_sendpages(transport->sock,
657 NULL, 0, xdr, req->rq_bytes_sent);
658
659 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
660 xdr->len - req->rq_bytes_sent, status);
661
662 if (unlikely(status < 0))
663 break;
664
665 /* If we've sent the entire packet, immediately
666 * reset the count of bytes sent. */
667 req->rq_bytes_sent += status;
668 task->tk_bytes_sent += status;
669 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
670 req->rq_bytes_sent = 0;
671 return 0;
672 }
673
674 status = -EAGAIN;
675 if (retry++ > XS_SENDMSG_RETRY)
676 break;
677 }
678
679 switch (status) {
680 case -EAGAIN:
681 xs_nospace(task);
682 break;
683 case -ECONNREFUSED:
684 case -ECONNRESET:
685 case -ENOTCONN:
686 case -EPIPE:
687 status = -ENOTCONN;
688 break;
689 default:
690 dprintk("RPC: sendmsg returned unrecognized error %d\n",
691 -status);
692 xprt_disconnect(xprt);
693 break;
694 }
695
696 return status;
697 }
698
699 /**
700 * xs_tcp_release_xprt - clean up after a tcp transmission
701 * @xprt: transport
702 * @task: rpc task
703 *
704 * This cleans up if an error causes us to abort the transmission of a request.
705 * In this case, the socket may need to be reset in order to avoid confusing
706 * the server.
707 */
708 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
709 {
710 struct rpc_rqst *req;
711
712 if (task != xprt->snd_task)
713 return;
714 if (task == NULL)
715 goto out_release;
716 req = task->tk_rqstp;
717 if (req->rq_bytes_sent == 0)
718 goto out_release;
719 if (req->rq_bytes_sent == req->rq_snd_buf.len)
720 goto out_release;
721 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
722 out_release:
723 xprt_release_xprt(xprt, task);
724 }
725
726 /**
727 * xs_close - close a socket
728 * @xprt: transport
729 *
730 * This is used when all requests are complete; ie, no DRC state remains
731 * on the server we want to save.
732 */
733 static void xs_close(struct rpc_xprt *xprt)
734 {
735 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
736 struct socket *sock = transport->sock;
737 struct sock *sk = transport->inet;
738
739 if (!sk)
740 goto clear_close_wait;
741
742 dprintk("RPC: xs_close xprt %p\n", xprt);
743
744 write_lock_bh(&sk->sk_callback_lock);
745 transport->inet = NULL;
746 transport->sock = NULL;
747
748 sk->sk_user_data = NULL;
749 sk->sk_data_ready = transport->old_data_ready;
750 sk->sk_state_change = transport->old_state_change;
751 sk->sk_write_space = transport->old_write_space;
752 write_unlock_bh(&sk->sk_callback_lock);
753
754 sk->sk_no_check = 0;
755
756 sock_release(sock);
757 clear_close_wait:
758 smp_mb__before_clear_bit();
759 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
760 smp_mb__after_clear_bit();
761 }
762
763 /**
764 * xs_destroy - prepare to shutdown a transport
765 * @xprt: doomed transport
766 *
767 */
768 static void xs_destroy(struct rpc_xprt *xprt)
769 {
770 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
771
772 dprintk("RPC: xs_destroy xprt %p\n", xprt);
773
774 cancel_rearming_delayed_work(&transport->connect_worker);
775
776 xprt_disconnect(xprt);
777 xs_close(xprt);
778 xs_free_peer_addresses(xprt);
779 kfree(xprt->slot);
780 kfree(xprt);
781 module_put(THIS_MODULE);
782 }
783
784 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
785 {
786 return (struct rpc_xprt *) sk->sk_user_data;
787 }
788
789 /**
790 * xs_udp_data_ready - "data ready" callback for UDP sockets
791 * @sk: socket with data to read
792 * @len: how much data to read
793 *
794 */
795 static void xs_udp_data_ready(struct sock *sk, int len)
796 {
797 struct rpc_task *task;
798 struct rpc_xprt *xprt;
799 struct rpc_rqst *rovr;
800 struct sk_buff *skb;
801 int err, repsize, copied;
802 u32 _xid;
803 __be32 *xp;
804
805 read_lock(&sk->sk_callback_lock);
806 dprintk("RPC: xs_udp_data_ready...\n");
807 if (!(xprt = xprt_from_sock(sk)))
808 goto out;
809
810 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
811 goto out;
812
813 if (xprt->shutdown)
814 goto dropit;
815
816 repsize = skb->len - sizeof(struct udphdr);
817 if (repsize < 4) {
818 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
819 goto dropit;
820 }
821
822 /* Copy the XID from the skb... */
823 xp = skb_header_pointer(skb, sizeof(struct udphdr),
824 sizeof(_xid), &_xid);
825 if (xp == NULL)
826 goto dropit;
827
828 /* Look up and lock the request corresponding to the given XID */
829 spin_lock(&xprt->transport_lock);
830 rovr = xprt_lookup_rqst(xprt, *xp);
831 if (!rovr)
832 goto out_unlock;
833 task = rovr->rq_task;
834
835 if ((copied = rovr->rq_private_buf.buflen) > repsize)
836 copied = repsize;
837
838 /* Suck it into the iovec, verify checksum if not done by hw. */
839 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
840 goto out_unlock;
841
842 /* Something worked... */
843 dst_confirm(skb->dst);
844
845 xprt_adjust_cwnd(task, copied);
846 xprt_update_rtt(task);
847 xprt_complete_rqst(task, copied);
848
849 out_unlock:
850 spin_unlock(&xprt->transport_lock);
851 dropit:
852 skb_free_datagram(sk, skb);
853 out:
854 read_unlock(&sk->sk_callback_lock);
855 }
856
857 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
858 {
859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
860 size_t len, used;
861 char *p;
862
863 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
864 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
865 used = xdr_skb_read_bits(desc, p, len);
866 transport->tcp_offset += used;
867 if (used != len)
868 return;
869
870 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
871 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
872 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
873 else
874 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
875 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
876
877 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
878 transport->tcp_offset = 0;
879
880 /* Sanity check of the record length */
881 if (unlikely(transport->tcp_reclen < 4)) {
882 dprintk("RPC: invalid TCP record fragment length\n");
883 xprt_disconnect(xprt);
884 return;
885 }
886 dprintk("RPC: reading TCP record fragment of length %d\n",
887 transport->tcp_reclen);
888 }
889
890 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
891 {
892 if (transport->tcp_offset == transport->tcp_reclen) {
893 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
894 transport->tcp_offset = 0;
895 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
896 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
897 transport->tcp_flags |= TCP_RCV_COPY_XID;
898 transport->tcp_copied = 0;
899 }
900 }
901 }
902
903 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
904 {
905 size_t len, used;
906 char *p;
907
908 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
909 dprintk("RPC: reading XID (%Zu bytes)\n", len);
910 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
911 used = xdr_skb_read_bits(desc, p, len);
912 transport->tcp_offset += used;
913 if (used != len)
914 return;
915 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
916 transport->tcp_flags |= TCP_RCV_COPY_DATA;
917 transport->tcp_copied = 4;
918 dprintk("RPC: reading reply for XID %08x\n",
919 ntohl(transport->tcp_xid));
920 xs_tcp_check_fraghdr(transport);
921 }
922
923 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
924 {
925 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
926 struct rpc_rqst *req;
927 struct xdr_buf *rcvbuf;
928 size_t len;
929 ssize_t r;
930
931 /* Find and lock the request corresponding to this xid */
932 spin_lock(&xprt->transport_lock);
933 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
934 if (!req) {
935 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
936 dprintk("RPC: XID %08x request not found!\n",
937 ntohl(transport->tcp_xid));
938 spin_unlock(&xprt->transport_lock);
939 return;
940 }
941
942 rcvbuf = &req->rq_private_buf;
943 len = desc->count;
944 if (len > transport->tcp_reclen - transport->tcp_offset) {
945 struct xdr_skb_reader my_desc;
946
947 len = transport->tcp_reclen - transport->tcp_offset;
948 memcpy(&my_desc, desc, sizeof(my_desc));
949 my_desc.count = len;
950 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
951 &my_desc, xdr_skb_read_bits);
952 desc->count -= r;
953 desc->offset += r;
954 } else
955 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
956 desc, xdr_skb_read_bits);
957
958 if (r > 0) {
959 transport->tcp_copied += r;
960 transport->tcp_offset += r;
961 }
962 if (r != len) {
963 /* Error when copying to the receive buffer,
964 * usually because we weren't able to allocate
965 * additional buffer pages. All we can do now
966 * is turn off TCP_RCV_COPY_DATA, so the request
967 * will not receive any additional updates,
968 * and time out.
969 * Any remaining data from this record will
970 * be discarded.
971 */
972 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
973 dprintk("RPC: XID %08x truncated request\n",
974 ntohl(transport->tcp_xid));
975 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
976 "tcp_offset = %u, tcp_reclen = %u\n",
977 xprt, transport->tcp_copied,
978 transport->tcp_offset, transport->tcp_reclen);
979 goto out;
980 }
981
982 dprintk("RPC: XID %08x read %Zd bytes\n",
983 ntohl(transport->tcp_xid), r);
984 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
985 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
986 transport->tcp_offset, transport->tcp_reclen);
987
988 if (transport->tcp_copied == req->rq_private_buf.buflen)
989 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
990 else if (transport->tcp_offset == transport->tcp_reclen) {
991 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
992 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
993 }
994
995 out:
996 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
997 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
998 spin_unlock(&xprt->transport_lock);
999 xs_tcp_check_fraghdr(transport);
1000 }
1001
1002 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1003 {
1004 size_t len;
1005
1006 len = transport->tcp_reclen - transport->tcp_offset;
1007 if (len > desc->count)
1008 len = desc->count;
1009 desc->count -= len;
1010 desc->offset += len;
1011 transport->tcp_offset += len;
1012 dprintk("RPC: discarded %Zu bytes\n", len);
1013 xs_tcp_check_fraghdr(transport);
1014 }
1015
1016 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1017 {
1018 struct rpc_xprt *xprt = rd_desc->arg.data;
1019 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1020 struct xdr_skb_reader desc = {
1021 .skb = skb,
1022 .offset = offset,
1023 .count = len,
1024 };
1025
1026 dprintk("RPC: xs_tcp_data_recv started\n");
1027 do {
1028 /* Read in a new fragment marker if necessary */
1029 /* Can we ever really expect to get completely empty fragments? */
1030 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1031 xs_tcp_read_fraghdr(xprt, &desc);
1032 continue;
1033 }
1034 /* Read in the xid if necessary */
1035 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1036 xs_tcp_read_xid(transport, &desc);
1037 continue;
1038 }
1039 /* Read in the request data */
1040 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1041 xs_tcp_read_request(xprt, &desc);
1042 continue;
1043 }
1044 /* Skip over any trailing bytes on short reads */
1045 xs_tcp_read_discard(transport, &desc);
1046 } while (desc.count);
1047 dprintk("RPC: xs_tcp_data_recv done\n");
1048 return len - desc.count;
1049 }
1050
1051 /**
1052 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1053 * @sk: socket with data to read
1054 * @bytes: how much data to read
1055 *
1056 */
1057 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1058 {
1059 struct rpc_xprt *xprt;
1060 read_descriptor_t rd_desc;
1061
1062 dprintk("RPC: xs_tcp_data_ready...\n");
1063
1064 read_lock(&sk->sk_callback_lock);
1065 if (!(xprt = xprt_from_sock(sk)))
1066 goto out;
1067 if (xprt->shutdown)
1068 goto out;
1069
1070 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1071 rd_desc.arg.data = xprt;
1072 rd_desc.count = 65536;
1073 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1074 out:
1075 read_unlock(&sk->sk_callback_lock);
1076 }
1077
1078 /**
1079 * xs_tcp_state_change - callback to handle TCP socket state changes
1080 * @sk: socket whose state has changed
1081 *
1082 */
1083 static void xs_tcp_state_change(struct sock *sk)
1084 {
1085 struct rpc_xprt *xprt;
1086
1087 read_lock(&sk->sk_callback_lock);
1088 if (!(xprt = xprt_from_sock(sk)))
1089 goto out;
1090 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1091 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1092 sk->sk_state, xprt_connected(xprt),
1093 sock_flag(sk, SOCK_DEAD),
1094 sock_flag(sk, SOCK_ZAPPED));
1095
1096 switch (sk->sk_state) {
1097 case TCP_ESTABLISHED:
1098 spin_lock_bh(&xprt->transport_lock);
1099 if (!xprt_test_and_set_connected(xprt)) {
1100 struct sock_xprt *transport = container_of(xprt,
1101 struct sock_xprt, xprt);
1102
1103 /* Reset TCP record info */
1104 transport->tcp_offset = 0;
1105 transport->tcp_reclen = 0;
1106 transport->tcp_copied = 0;
1107 transport->tcp_flags =
1108 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1109
1110 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1111 xprt_wake_pending_tasks(xprt, 0);
1112 }
1113 spin_unlock_bh(&xprt->transport_lock);
1114 break;
1115 case TCP_SYN_SENT:
1116 case TCP_SYN_RECV:
1117 break;
1118 case TCP_CLOSE_WAIT:
1119 /* Try to schedule an autoclose RPC calls */
1120 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1121 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1122 queue_work(rpciod_workqueue, &xprt->task_cleanup);
1123 default:
1124 xprt_disconnect(xprt);
1125 }
1126 out:
1127 read_unlock(&sk->sk_callback_lock);
1128 }
1129
1130 /**
1131 * xs_udp_write_space - callback invoked when socket buffer space
1132 * becomes available
1133 * @sk: socket whose state has changed
1134 *
1135 * Called when more output buffer space is available for this socket.
1136 * We try not to wake our writers until they can make "significant"
1137 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1138 * with a bunch of small requests.
1139 */
1140 static void xs_udp_write_space(struct sock *sk)
1141 {
1142 read_lock(&sk->sk_callback_lock);
1143
1144 /* from net/core/sock.c:sock_def_write_space */
1145 if (sock_writeable(sk)) {
1146 struct socket *sock;
1147 struct rpc_xprt *xprt;
1148
1149 if (unlikely(!(sock = sk->sk_socket)))
1150 goto out;
1151 if (unlikely(!(xprt = xprt_from_sock(sk))))
1152 goto out;
1153 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1154 goto out;
1155
1156 xprt_write_space(xprt);
1157 }
1158
1159 out:
1160 read_unlock(&sk->sk_callback_lock);
1161 }
1162
1163 /**
1164 * xs_tcp_write_space - callback invoked when socket buffer space
1165 * becomes available
1166 * @sk: socket whose state has changed
1167 *
1168 * Called when more output buffer space is available for this socket.
1169 * We try not to wake our writers until they can make "significant"
1170 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1171 * with a bunch of small requests.
1172 */
1173 static void xs_tcp_write_space(struct sock *sk)
1174 {
1175 read_lock(&sk->sk_callback_lock);
1176
1177 /* from net/core/stream.c:sk_stream_write_space */
1178 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1179 struct socket *sock;
1180 struct rpc_xprt *xprt;
1181
1182 if (unlikely(!(sock = sk->sk_socket)))
1183 goto out;
1184 if (unlikely(!(xprt = xprt_from_sock(sk))))
1185 goto out;
1186 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1187 goto out;
1188
1189 xprt_write_space(xprt);
1190 }
1191
1192 out:
1193 read_unlock(&sk->sk_callback_lock);
1194 }
1195
1196 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1197 {
1198 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1199 struct sock *sk = transport->inet;
1200
1201 if (transport->rcvsize) {
1202 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1203 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1204 }
1205 if (transport->sndsize) {
1206 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1207 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1208 sk->sk_write_space(sk);
1209 }
1210 }
1211
1212 /**
1213 * xs_udp_set_buffer_size - set send and receive limits
1214 * @xprt: generic transport
1215 * @sndsize: requested size of send buffer, in bytes
1216 * @rcvsize: requested size of receive buffer, in bytes
1217 *
1218 * Set socket send and receive buffer size limits.
1219 */
1220 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1221 {
1222 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1223
1224 transport->sndsize = 0;
1225 if (sndsize)
1226 transport->sndsize = sndsize + 1024;
1227 transport->rcvsize = 0;
1228 if (rcvsize)
1229 transport->rcvsize = rcvsize + 1024;
1230
1231 xs_udp_do_set_buffer_size(xprt);
1232 }
1233
1234 /**
1235 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1236 * @task: task that timed out
1237 *
1238 * Adjust the congestion window after a retransmit timeout has occurred.
1239 */
1240 static void xs_udp_timer(struct rpc_task *task)
1241 {
1242 xprt_adjust_cwnd(task, -ETIMEDOUT);
1243 }
1244
1245 static unsigned short xs_get_random_port(void)
1246 {
1247 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1248 unsigned short rand = (unsigned short) net_random() % range;
1249 return rand + xprt_min_resvport;
1250 }
1251
1252 /**
1253 * xs_set_port - reset the port number in the remote endpoint address
1254 * @xprt: generic transport
1255 * @port: new port number
1256 *
1257 */
1258 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1259 {
1260 struct sockaddr *addr = xs_addr(xprt);
1261
1262 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1263
1264 switch (addr->sa_family) {
1265 case AF_INET:
1266 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1267 break;
1268 case AF_INET6:
1269 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1270 break;
1271 default:
1272 BUG();
1273 }
1274 }
1275
1276 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1277 {
1278 struct sockaddr_in myaddr = {
1279 .sin_family = AF_INET,
1280 };
1281 struct sockaddr_in *sa;
1282 int err;
1283 unsigned short port = transport->port;
1284
1285 if (!transport->xprt.resvport)
1286 port = 0;
1287 sa = (struct sockaddr_in *)&transport->addr;
1288 myaddr.sin_addr = sa->sin_addr;
1289 do {
1290 myaddr.sin_port = htons(port);
1291 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1292 sizeof(myaddr));
1293 if (!transport->xprt.resvport)
1294 break;
1295 if (err == 0) {
1296 transport->port = port;
1297 break;
1298 }
1299 if (port <= xprt_min_resvport)
1300 port = xprt_max_resvport;
1301 else
1302 port--;
1303 } while (err == -EADDRINUSE && port != transport->port);
1304 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1305 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1306 port, err ? "failed" : "ok", err);
1307 return err;
1308 }
1309
1310 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1311 {
1312 struct sockaddr_in6 myaddr = {
1313 .sin6_family = AF_INET6,
1314 };
1315 struct sockaddr_in6 *sa;
1316 int err;
1317 unsigned short port = transport->port;
1318
1319 if (!transport->xprt.resvport)
1320 port = 0;
1321 sa = (struct sockaddr_in6 *)&transport->addr;
1322 myaddr.sin6_addr = sa->sin6_addr;
1323 do {
1324 myaddr.sin6_port = htons(port);
1325 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1326 sizeof(myaddr));
1327 if (!transport->xprt.resvport)
1328 break;
1329 if (err == 0) {
1330 transport->port = port;
1331 break;
1332 }
1333 if (port <= xprt_min_resvport)
1334 port = xprt_max_resvport;
1335 else
1336 port--;
1337 } while (err == -EADDRINUSE && port != transport->port);
1338 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1339 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1340 return err;
1341 }
1342
1343 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1344 static struct lock_class_key xs_key[2];
1345 static struct lock_class_key xs_slock_key[2];
1346
1347 static inline void xs_reclassify_socket4(struct socket *sock)
1348 {
1349 struct sock *sk = sock->sk;
1350
1351 BUG_ON(sk->sk_lock.owner != NULL);
1352 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1353 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1354 }
1355
1356 static inline void xs_reclassify_socket6(struct socket *sock)
1357 {
1358 struct sock *sk = sock->sk;
1359
1360 BUG_ON(sk->sk_lock.owner != NULL);
1361 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1362 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1363 }
1364 #else
1365 static inline void xs_reclassify_socket4(struct socket *sock)
1366 {
1367 }
1368
1369 static inline void xs_reclassify_socket6(struct socket *sock)
1370 {
1371 }
1372 #endif
1373
1374 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1375 {
1376 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1377
1378 if (!transport->inet) {
1379 struct sock *sk = sock->sk;
1380
1381 write_lock_bh(&sk->sk_callback_lock);
1382
1383 sk->sk_user_data = xprt;
1384 transport->old_data_ready = sk->sk_data_ready;
1385 transport->old_state_change = sk->sk_state_change;
1386 transport->old_write_space = sk->sk_write_space;
1387 sk->sk_data_ready = xs_udp_data_ready;
1388 sk->sk_write_space = xs_udp_write_space;
1389 sk->sk_no_check = UDP_CSUM_NORCV;
1390 sk->sk_allocation = GFP_ATOMIC;
1391
1392 xprt_set_connected(xprt);
1393
1394 /* Reset to new socket */
1395 transport->sock = sock;
1396 transport->inet = sk;
1397
1398 write_unlock_bh(&sk->sk_callback_lock);
1399 }
1400 xs_udp_do_set_buffer_size(xprt);
1401 }
1402
1403 /**
1404 * xs_udp_connect_worker4 - set up a UDP socket
1405 * @work: RPC transport to connect
1406 *
1407 * Invoked by a work queue tasklet.
1408 */
1409 static void xs_udp_connect_worker4(struct work_struct *work)
1410 {
1411 struct sock_xprt *transport =
1412 container_of(work, struct sock_xprt, connect_worker.work);
1413 struct rpc_xprt *xprt = &transport->xprt;
1414 struct socket *sock = transport->sock;
1415 int err, status = -EIO;
1416
1417 if (xprt->shutdown || !xprt_bound(xprt))
1418 goto out;
1419
1420 /* Start by resetting any existing state */
1421 xs_close(xprt);
1422
1423 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1424 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1425 goto out;
1426 }
1427 xs_reclassify_socket4(sock);
1428
1429 if (xs_bind4(transport, sock)) {
1430 sock_release(sock);
1431 goto out;
1432 }
1433
1434 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1435 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1436
1437 xs_udp_finish_connecting(xprt, sock);
1438 status = 0;
1439 out:
1440 xprt_wake_pending_tasks(xprt, status);
1441 xprt_clear_connecting(xprt);
1442 }
1443
1444 /**
1445 * xs_udp_connect_worker6 - set up a UDP socket
1446 * @work: RPC transport to connect
1447 *
1448 * Invoked by a work queue tasklet.
1449 */
1450 static void xs_udp_connect_worker6(struct work_struct *work)
1451 {
1452 struct sock_xprt *transport =
1453 container_of(work, struct sock_xprt, connect_worker.work);
1454 struct rpc_xprt *xprt = &transport->xprt;
1455 struct socket *sock = transport->sock;
1456 int err, status = -EIO;
1457
1458 if (xprt->shutdown || !xprt_bound(xprt))
1459 goto out;
1460
1461 /* Start by resetting any existing state */
1462 xs_close(xprt);
1463
1464 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1465 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1466 goto out;
1467 }
1468 xs_reclassify_socket6(sock);
1469
1470 if (xs_bind6(transport, sock) < 0) {
1471 sock_release(sock);
1472 goto out;
1473 }
1474
1475 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1476 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1477
1478 xs_udp_finish_connecting(xprt, sock);
1479 status = 0;
1480 out:
1481 xprt_wake_pending_tasks(xprt, status);
1482 xprt_clear_connecting(xprt);
1483 }
1484
1485 /*
1486 * We need to preserve the port number so the reply cache on the server can
1487 * find our cached RPC replies when we get around to reconnecting.
1488 */
1489 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1490 {
1491 int result;
1492 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1493 struct sockaddr any;
1494
1495 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1496
1497 /*
1498 * Disconnect the transport socket by doing a connect operation
1499 * with AF_UNSPEC. This should return immediately...
1500 */
1501 memset(&any, 0, sizeof(any));
1502 any.sa_family = AF_UNSPEC;
1503 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1504 if (result)
1505 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1506 result);
1507 }
1508
1509 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1510 {
1511 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1512
1513 if (!transport->inet) {
1514 struct sock *sk = sock->sk;
1515
1516 write_lock_bh(&sk->sk_callback_lock);
1517
1518 sk->sk_user_data = xprt;
1519 transport->old_data_ready = sk->sk_data_ready;
1520 transport->old_state_change = sk->sk_state_change;
1521 transport->old_write_space = sk->sk_write_space;
1522 sk->sk_data_ready = xs_tcp_data_ready;
1523 sk->sk_state_change = xs_tcp_state_change;
1524 sk->sk_write_space = xs_tcp_write_space;
1525 sk->sk_allocation = GFP_ATOMIC;
1526
1527 /* socket options */
1528 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1529 sock_reset_flag(sk, SOCK_LINGER);
1530 tcp_sk(sk)->linger2 = 0;
1531 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1532
1533 xprt_clear_connected(xprt);
1534
1535 /* Reset to new socket */
1536 transport->sock = sock;
1537 transport->inet = sk;
1538
1539 write_unlock_bh(&sk->sk_callback_lock);
1540 }
1541
1542 /* Tell the socket layer to start connecting... */
1543 xprt->stat.connect_count++;
1544 xprt->stat.connect_start = jiffies;
1545 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1546 }
1547
1548 /**
1549 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1550 * @work: RPC transport to connect
1551 *
1552 * Invoked by a work queue tasklet.
1553 */
1554 static void xs_tcp_connect_worker4(struct work_struct *work)
1555 {
1556 struct sock_xprt *transport =
1557 container_of(work, struct sock_xprt, connect_worker.work);
1558 struct rpc_xprt *xprt = &transport->xprt;
1559 struct socket *sock = transport->sock;
1560 int err, status = -EIO;
1561
1562 if (xprt->shutdown || !xprt_bound(xprt))
1563 goto out;
1564
1565 if (!sock) {
1566 /* start from scratch */
1567 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1568 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1569 goto out;
1570 }
1571 xs_reclassify_socket4(sock);
1572
1573 if (xs_bind4(transport, sock) < 0) {
1574 sock_release(sock);
1575 goto out;
1576 }
1577 } else
1578 /* "close" the socket, preserving the local port */
1579 xs_tcp_reuse_connection(xprt);
1580
1581 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1582 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1583
1584 status = xs_tcp_finish_connecting(xprt, sock);
1585 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1586 xprt, -status, xprt_connected(xprt),
1587 sock->sk->sk_state);
1588 if (status < 0) {
1589 switch (status) {
1590 case -EINPROGRESS:
1591 case -EALREADY:
1592 goto out_clear;
1593 case -ECONNREFUSED:
1594 case -ECONNRESET:
1595 /* retry with existing socket, after a delay */
1596 break;
1597 default:
1598 /* get rid of existing socket, and retry */
1599 xs_close(xprt);
1600 break;
1601 }
1602 }
1603 out:
1604 xprt_wake_pending_tasks(xprt, status);
1605 out_clear:
1606 xprt_clear_connecting(xprt);
1607 }
1608
1609 /**
1610 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1611 * @work: RPC transport to connect
1612 *
1613 * Invoked by a work queue tasklet.
1614 */
1615 static void xs_tcp_connect_worker6(struct work_struct *work)
1616 {
1617 struct sock_xprt *transport =
1618 container_of(work, struct sock_xprt, connect_worker.work);
1619 struct rpc_xprt *xprt = &transport->xprt;
1620 struct socket *sock = transport->sock;
1621 int err, status = -EIO;
1622
1623 if (xprt->shutdown || !xprt_bound(xprt))
1624 goto out;
1625
1626 if (!sock) {
1627 /* start from scratch */
1628 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1629 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1630 goto out;
1631 }
1632 xs_reclassify_socket6(sock);
1633
1634 if (xs_bind6(transport, sock) < 0) {
1635 sock_release(sock);
1636 goto out;
1637 }
1638 } else
1639 /* "close" the socket, preserving the local port */
1640 xs_tcp_reuse_connection(xprt);
1641
1642 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1643 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1644
1645 status = xs_tcp_finish_connecting(xprt, sock);
1646 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1647 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1648 if (status < 0) {
1649 switch (status) {
1650 case -EINPROGRESS:
1651 case -EALREADY:
1652 goto out_clear;
1653 case -ECONNREFUSED:
1654 case -ECONNRESET:
1655 /* retry with existing socket, after a delay */
1656 break;
1657 default:
1658 /* get rid of existing socket, and retry */
1659 xs_close(xprt);
1660 break;
1661 }
1662 }
1663 out:
1664 xprt_wake_pending_tasks(xprt, status);
1665 out_clear:
1666 xprt_clear_connecting(xprt);
1667 }
1668
1669 /**
1670 * xs_connect - connect a socket to a remote endpoint
1671 * @task: address of RPC task that manages state of connect request
1672 *
1673 * TCP: If the remote end dropped the connection, delay reconnecting.
1674 *
1675 * UDP socket connects are synchronous, but we use a work queue anyway
1676 * to guarantee that even unprivileged user processes can set up a
1677 * socket on a privileged port.
1678 *
1679 * If a UDP socket connect fails, the delay behavior here prevents
1680 * retry floods (hard mounts).
1681 */
1682 static void xs_connect(struct rpc_task *task)
1683 {
1684 struct rpc_xprt *xprt = task->tk_xprt;
1685 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1686
1687 if (xprt_test_and_set_connecting(xprt))
1688 return;
1689
1690 if (transport->sock != NULL) {
1691 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1692 "seconds\n",
1693 xprt, xprt->reestablish_timeout / HZ);
1694 queue_delayed_work(rpciod_workqueue,
1695 &transport->connect_worker,
1696 xprt->reestablish_timeout);
1697 xprt->reestablish_timeout <<= 1;
1698 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1699 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1700 } else {
1701 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1702 queue_delayed_work(rpciod_workqueue,
1703 &transport->connect_worker, 0);
1704 }
1705 }
1706
1707 /**
1708 * xs_udp_print_stats - display UDP socket-specifc stats
1709 * @xprt: rpc_xprt struct containing statistics
1710 * @seq: output file
1711 *
1712 */
1713 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1714 {
1715 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1716
1717 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1718 transport->port,
1719 xprt->stat.bind_count,
1720 xprt->stat.sends,
1721 xprt->stat.recvs,
1722 xprt->stat.bad_xids,
1723 xprt->stat.req_u,
1724 xprt->stat.bklog_u);
1725 }
1726
1727 /**
1728 * xs_tcp_print_stats - display TCP socket-specifc stats
1729 * @xprt: rpc_xprt struct containing statistics
1730 * @seq: output file
1731 *
1732 */
1733 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1734 {
1735 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1736 long idle_time = 0;
1737
1738 if (xprt_connected(xprt))
1739 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1740
1741 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1742 transport->port,
1743 xprt->stat.bind_count,
1744 xprt->stat.connect_count,
1745 xprt->stat.connect_time,
1746 idle_time,
1747 xprt->stat.sends,
1748 xprt->stat.recvs,
1749 xprt->stat.bad_xids,
1750 xprt->stat.req_u,
1751 xprt->stat.bklog_u);
1752 }
1753
1754 static struct rpc_xprt_ops xs_udp_ops = {
1755 .set_buffer_size = xs_udp_set_buffer_size,
1756 .reserve_xprt = xprt_reserve_xprt_cong,
1757 .release_xprt = xprt_release_xprt_cong,
1758 .rpcbind = rpcb_getport_async,
1759 .set_port = xs_set_port,
1760 .connect = xs_connect,
1761 .buf_alloc = rpc_malloc,
1762 .buf_free = rpc_free,
1763 .send_request = xs_udp_send_request,
1764 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1765 .timer = xs_udp_timer,
1766 .release_request = xprt_release_rqst_cong,
1767 .close = xs_close,
1768 .destroy = xs_destroy,
1769 .print_stats = xs_udp_print_stats,
1770 };
1771
1772 static struct rpc_xprt_ops xs_tcp_ops = {
1773 .reserve_xprt = xprt_reserve_xprt,
1774 .release_xprt = xs_tcp_release_xprt,
1775 .rpcbind = rpcb_getport_async,
1776 .set_port = xs_set_port,
1777 .connect = xs_connect,
1778 .buf_alloc = rpc_malloc,
1779 .buf_free = rpc_free,
1780 .send_request = xs_tcp_send_request,
1781 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1782 .close = xs_close,
1783 .destroy = xs_destroy,
1784 .print_stats = xs_tcp_print_stats,
1785 };
1786
1787 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1788 unsigned int slot_table_size)
1789 {
1790 struct rpc_xprt *xprt;
1791 struct sock_xprt *new;
1792
1793 if (args->addrlen > sizeof(xprt->addr)) {
1794 dprintk("RPC: xs_setup_xprt: address too large\n");
1795 return ERR_PTR(-EBADF);
1796 }
1797
1798 new = kzalloc(sizeof(*new), GFP_KERNEL);
1799 if (new == NULL) {
1800 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1801 "rpc_xprt\n");
1802 return ERR_PTR(-ENOMEM);
1803 }
1804 xprt = &new->xprt;
1805
1806 xprt->max_reqs = slot_table_size;
1807 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1808 if (xprt->slot == NULL) {
1809 kfree(xprt);
1810 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1811 "table\n");
1812 return ERR_PTR(-ENOMEM);
1813 }
1814
1815 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1816 xprt->addrlen = args->addrlen;
1817 if (args->srcaddr)
1818 memcpy(&new->addr, args->srcaddr, args->addrlen);
1819 new->port = xs_get_random_port();
1820
1821 return xprt;
1822 }
1823
1824 /**
1825 * xs_setup_udp - Set up transport to use a UDP socket
1826 * @args: rpc transport creation arguments
1827 *
1828 */
1829 struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1830 {
1831 struct sockaddr *addr = args->dstaddr;
1832 struct rpc_xprt *xprt;
1833 struct sock_xprt *transport;
1834
1835 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1836 if (IS_ERR(xprt))
1837 return xprt;
1838 transport = container_of(xprt, struct sock_xprt, xprt);
1839
1840 xprt->prot = IPPROTO_UDP;
1841 xprt->tsh_size = 0;
1842 /* XXX: header size can vary due to auth type, IPv6, etc. */
1843 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1844
1845 xprt->bind_timeout = XS_BIND_TO;
1846 xprt->connect_timeout = XS_UDP_CONN_TO;
1847 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1848 xprt->idle_timeout = XS_IDLE_DISC_TO;
1849
1850 xprt->ops = &xs_udp_ops;
1851
1852 if (args->timeout)
1853 xprt->timeout = *args->timeout;
1854 else
1855 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1856
1857 switch (addr->sa_family) {
1858 case AF_INET:
1859 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1860 xprt_set_bound(xprt);
1861
1862 INIT_DELAYED_WORK(&transport->connect_worker,
1863 xs_udp_connect_worker4);
1864 xs_format_ipv4_peer_addresses(xprt);
1865 break;
1866 case AF_INET6:
1867 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1868 xprt_set_bound(xprt);
1869
1870 INIT_DELAYED_WORK(&transport->connect_worker,
1871 xs_udp_connect_worker6);
1872 xs_format_ipv6_peer_addresses(xprt);
1873 break;
1874 default:
1875 kfree(xprt);
1876 return ERR_PTR(-EAFNOSUPPORT);
1877 }
1878
1879 dprintk("RPC: set up transport to address %s\n",
1880 xprt->address_strings[RPC_DISPLAY_ALL]);
1881
1882 if (try_module_get(THIS_MODULE))
1883 return xprt;
1884
1885 kfree(xprt->slot);
1886 kfree(xprt);
1887 return ERR_PTR(-EINVAL);
1888 }
1889
1890 /**
1891 * xs_setup_tcp - Set up transport to use a TCP socket
1892 * @args: rpc transport creation arguments
1893 *
1894 */
1895 struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1896 {
1897 struct sockaddr *addr = args->dstaddr;
1898 struct rpc_xprt *xprt;
1899 struct sock_xprt *transport;
1900
1901 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1902 if (IS_ERR(xprt))
1903 return xprt;
1904 transport = container_of(xprt, struct sock_xprt, xprt);
1905
1906 xprt->prot = IPPROTO_TCP;
1907 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1908 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1909
1910 xprt->bind_timeout = XS_BIND_TO;
1911 xprt->connect_timeout = XS_TCP_CONN_TO;
1912 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1913 xprt->idle_timeout = XS_IDLE_DISC_TO;
1914
1915 xprt->ops = &xs_tcp_ops;
1916
1917 if (args->timeout)
1918 xprt->timeout = *args->timeout;
1919 else
1920 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1921
1922 switch (addr->sa_family) {
1923 case AF_INET:
1924 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1925 xprt_set_bound(xprt);
1926
1927 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1928 xs_format_ipv4_peer_addresses(xprt);
1929 break;
1930 case AF_INET6:
1931 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1932 xprt_set_bound(xprt);
1933
1934 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
1935 xs_format_ipv6_peer_addresses(xprt);
1936 break;
1937 default:
1938 kfree(xprt);
1939 return ERR_PTR(-EAFNOSUPPORT);
1940 }
1941
1942 dprintk("RPC: set up transport to address %s\n",
1943 xprt->address_strings[RPC_DISPLAY_ALL]);
1944
1945 if (try_module_get(THIS_MODULE))
1946 return xprt;
1947
1948 kfree(xprt->slot);
1949 kfree(xprt);
1950 return ERR_PTR(-EINVAL);
1951 }
1952
1953 static struct xprt_class xs_udp_transport = {
1954 .list = LIST_HEAD_INIT(xs_udp_transport.list),
1955 .name = "udp",
1956 .owner = THIS_MODULE,
1957 .family = AF_INET,
1958 .protocol = IPPROTO_UDP,
1959 .setup = xs_setup_udp,
1960 };
1961
1962 static struct xprt_class xs_tcp_transport = {
1963 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
1964 .name = "tcp",
1965 .owner = THIS_MODULE,
1966 .family = AF_INET,
1967 .protocol = IPPROTO_TCP,
1968 .setup = xs_setup_tcp,
1969 };
1970
1971 /**
1972 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
1973 *
1974 */
1975 int init_socket_xprt(void)
1976 {
1977 #ifdef RPC_DEBUG
1978 if (!sunrpc_table_header)
1979 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1980 #endif
1981
1982 xprt_register_transport(&xs_udp_transport);
1983 xprt_register_transport(&xs_tcp_transport);
1984
1985 return 0;
1986 }
1987
1988 /**
1989 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
1990 *
1991 */
1992 void cleanup_socket_xprt(void)
1993 {
1994 #ifdef RPC_DEBUG
1995 if (sunrpc_table_header) {
1996 unregister_sysctl_table(sunrpc_table_header);
1997 sunrpc_table_header = NULL;
1998 }
1999 #endif
2000
2001 xprt_unregister_transport(&xs_udp_transport);
2002 xprt_unregister_transport(&xs_tcp_transport);
2003 }