projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
SUNRPC: fewer conditionals in the format_ip_address routines
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / sunrpc / xprtsock.c
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44 * xprtsock tunables
45 */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
56 *
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
59 */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
73 */
74 static ctl_table xs_tunables_table[] = {
75 {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
80 .mode = 0644,
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
85 },
86 {
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
91 .mode = 0644,
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
107 },
108 {
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .ctl_name = 0,
121 },
122 };
123
124 static ctl_table sunrpc_table[] = {
125 {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
128 .mode = 0555,
129 .child = xs_tunables_table
130 },
131 {
132 .ctl_name = 0,
133 },
134 };
135
136 #endif
137
138 /*
139 * How many times to try sending a request on a socket before waiting
140 * for the socket buffer to clear.
141 */
142 #define XS_SENDMSG_RETRY (10U)
143
144 /*
145 * Time out for an RPC UDP socket connect. UDP socket connects are
146 * synchronous, but we set a timeout anyway in case of resource
147 * exhaustion on the local host.
148 */
149 #define XS_UDP_CONN_TO (5U * HZ)
150
151 /*
152 * Wait duration for an RPC TCP connection to be established. Solaris
153 * NFS over TCP uses 60 seconds, for example, which is in line with how
154 * long a server takes to reboot.
155 */
156 #define XS_TCP_CONN_TO (60U * HZ)
157
158 /*
159 * Wait duration for a reply from the RPC portmapper.
160 */
161 #define XS_BIND_TO (60U * HZ)
162
163 /*
164 * Delay if a UDP socket connect error occurs. This is most likely some
165 * kind of resource problem on the local host.
166 */
167 #define XS_UDP_REEST_TO (2U * HZ)
168
169 /*
170 * The reestablish timeout allows clients to delay for a bit before attempting
171 * to reconnect to a server that just dropped our connection.
172 *
173 * We implement an exponential backoff when trying to reestablish a TCP
174 * transport connection with the server. Some servers like to drop a TCP
175 * connection when they are overworked, so we start with a short timeout and
176 * increase over time if the server is down or not responding.
177 */
178 #define XS_TCP_INIT_REEST_TO (3U * HZ)
179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
180
181 /*
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
185 */
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
187
188 #ifdef RPC_DEBUG
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
191 #endif
192
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
195 {
196 u8 *buf = (u8 *) packet;
197 int j;
198
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
201 if (!(j & 31)) {
202 if (j)
203 dprintk("\n");
204 dprintk("0x%04x ", j);
205 }
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 }
209 dprintk("\n");
210 }
211 #else
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
213 {
214 /* NOP */
215 }
216 #endif
217
218 struct sock_xprt {
219 struct rpc_xprt xprt;
220
221 /*
222 * Network layer
223 */
224 struct socket * sock;
225 struct sock * inet;
226
227 /*
228 * State of TCP reply receive
229 */
230 __be32 tcp_fraghdr,
231 tcp_xid;
232
233 u32 tcp_offset,
234 tcp_reclen;
235
236 unsigned long tcp_copied,
237 tcp_flags;
238
239 /*
240 * Connection of transports
241 */
242 struct delayed_work connect_worker;
243 struct sockaddr_storage addr;
244 unsigned short port;
245
246 /*
247 * UDP socket buffer size parameters
248 */
249 size_t rcvsize,
250 sndsize;
251
252 /*
253 * Saved socket callback addresses
254 */
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(struct sock *);
258 };
259
260 /*
261 * TCP receive state flags
262 */
263 #define TCP_RCV_LAST_FRAG (1UL << 0)
264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265 #define TCP_RCV_COPY_XID (1UL << 2)
266 #define TCP_RCV_COPY_DATA (1UL << 3)
267
268 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
269 {
270 return (struct sockaddr *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
274 {
275 return (struct sockaddr_in *) &xprt->addr;
276 }
277
278 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
279 {
280 return (struct sockaddr_in6 *) &xprt->addr;
281 }
282
283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
284 const char *protocol,
285 const char *netid)
286 {
287 struct sockaddr_in *addr = xs_addr_in(xprt);
288 char *buf;
289
290 buf = kzalloc(20, GFP_KERNEL);
291 if (buf) {
292 snprintf(buf, 20, NIPQUAD_FMT,
293 NIPQUAD(addr->sin_addr.s_addr));
294 }
295 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
296
297 buf = kzalloc(8, GFP_KERNEL);
298 if (buf) {
299 snprintf(buf, 8, "%u",
300 ntohs(addr->sin_port));
301 }
302 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
303
304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
305
306 buf = kzalloc(48, GFP_KERNEL);
307 if (buf) {
308 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
309 NIPQUAD(addr->sin_addr.s_addr),
310 ntohs(addr->sin_port),
311 protocol);
312 }
313 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
314
315 buf = kzalloc(10, GFP_KERNEL);
316 if (buf) {
317 snprintf(buf, 10, "%02x%02x%02x%02x",
318 NIPQUAD(addr->sin_addr.s_addr));
319 }
320 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
321
322 buf = kzalloc(8, GFP_KERNEL);
323 if (buf) {
324 snprintf(buf, 8, "%4hx",
325 ntohs(addr->sin_port));
326 }
327 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
328
329 buf = kzalloc(30, GFP_KERNEL);
330 if (buf) {
331 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
332 NIPQUAD(addr->sin_addr.s_addr),
333 ntohs(addr->sin_port) >> 8,
334 ntohs(addr->sin_port) & 0xff);
335 }
336 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
337
338 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
339 }
340
341 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
342 const char *protocol,
343 const char *netid)
344 {
345 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
346 char *buf;
347
348 buf = kzalloc(40, GFP_KERNEL);
349 if (buf) {
350 snprintf(buf, 40, NIP6_FMT,
351 NIP6(addr->sin6_addr));
352 }
353 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
354
355 buf = kzalloc(8, GFP_KERNEL);
356 if (buf) {
357 snprintf(buf, 8, "%u",
358 ntohs(addr->sin6_port));
359 }
360 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
361
362 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
363
364 buf = kzalloc(64, GFP_KERNEL);
365 if (buf) {
366 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
367 NIP6(addr->sin6_addr),
368 ntohs(addr->sin6_port),
369 protocol);
370 }
371 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
372
373 buf = kzalloc(36, GFP_KERNEL);
374 if (buf) {
375 snprintf(buf, 36, NIP6_SEQFMT,
376 NIP6(addr->sin6_addr));
377 }
378 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
379
380 buf = kzalloc(8, GFP_KERNEL);
381 if (buf) {
382 snprintf(buf, 8, "%4hx",
383 ntohs(addr->sin6_port));
384 }
385 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
386
387 buf = kzalloc(50, GFP_KERNEL);
388 if (buf) {
389 snprintf(buf, 50, NIP6_FMT".%u.%u",
390 NIP6(addr->sin6_addr),
391 ntohs(addr->sin6_port) >> 8,
392 ntohs(addr->sin6_port) & 0xff);
393 }
394 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
395
396 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
397 }
398
399 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
400 {
401 kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
402 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
403 kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
404 kfree(xprt->address_strings[RPC_DISPLAY_HEX_ADDR]);
405 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
406 kfree(xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR]);
407 }
408
409 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
410
411 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
412 {
413 struct msghdr msg = {
414 .msg_name = addr,
415 .msg_namelen = addrlen,
416 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
417 };
418 struct kvec iov = {
419 .iov_base = vec->iov_base + base,
420 .iov_len = vec->iov_len - base,
421 };
422
423 if (iov.iov_len != 0)
424 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
425 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
426 }
427
428 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
429 {
430 struct page **ppage;
431 unsigned int remainder;
432 int err, sent = 0;
433
434 remainder = xdr->page_len - base;
435 base += xdr->page_base;
436 ppage = xdr->pages + (base >> PAGE_SHIFT);
437 base &= ~PAGE_MASK;
438 for(;;) {
439 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
440 int flags = XS_SENDMSG_FLAGS;
441
442 remainder -= len;
443 if (remainder != 0 || more)
444 flags |= MSG_MORE;
445 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
446 if (remainder == 0 || err != len)
447 break;
448 sent += err;
449 ppage++;
450 base = 0;
451 }
452 if (sent == 0)
453 return err;
454 if (err > 0)
455 sent += err;
456 return sent;
457 }
458
459 /**
460 * xs_sendpages - write pages directly to a socket
461 * @sock: socket to send on
462 * @addr: UDP only -- address of destination
463 * @addrlen: UDP only -- length of destination address
464 * @xdr: buffer containing this request
465 * @base: starting position in the buffer
466 *
467 */
468 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
469 {
470 unsigned int remainder = xdr->len - base;
471 int err, sent = 0;
472
473 if (unlikely(!sock))
474 return -ENOTCONN;
475
476 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
477 if (base != 0) {
478 addr = NULL;
479 addrlen = 0;
480 }
481
482 if (base < xdr->head[0].iov_len || addr != NULL) {
483 unsigned int len = xdr->head[0].iov_len - base;
484 remainder -= len;
485 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
486 if (remainder == 0 || err != len)
487 goto out;
488 sent += err;
489 base = 0;
490 } else
491 base -= xdr->head[0].iov_len;
492
493 if (base < xdr->page_len) {
494 unsigned int len = xdr->page_len - base;
495 remainder -= len;
496 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
497 if (remainder == 0 || err != len)
498 goto out;
499 sent += err;
500 base = 0;
501 } else
502 base -= xdr->page_len;
503
504 if (base >= xdr->tail[0].iov_len)
505 return sent;
506 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
507 out:
508 if (sent == 0)
509 return err;
510 if (err > 0)
511 sent += err;
512 return sent;
513 }
514
515 /**
516 * xs_nospace - place task on wait queue if transmit was incomplete
517 * @task: task to put to sleep
518 *
519 */
520 static void xs_nospace(struct rpc_task *task)
521 {
522 struct rpc_rqst *req = task->tk_rqstp;
523 struct rpc_xprt *xprt = req->rq_xprt;
524 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
525
526 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
527 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
528 req->rq_slen);
529
530 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
531 /* Protect against races with write_space */
532 spin_lock_bh(&xprt->transport_lock);
533
534 /* Don't race with disconnect */
535 if (!xprt_connected(xprt))
536 task->tk_status = -ENOTCONN;
537 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
538 xprt_wait_for_buffer_space(task);
539
540 spin_unlock_bh(&xprt->transport_lock);
541 } else
542 /* Keep holding the socket if it is blocked */
543 rpc_delay(task, HZ>>4);
544 }
545
546 /**
547 * xs_udp_send_request - write an RPC request to a UDP socket
548 * @task: address of RPC task that manages the state of an RPC request
549 *
550 * Return values:
551 * 0: The request has been sent
552 * EAGAIN: The socket was blocked, please call again later to
553 * complete the request
554 * ENOTCONN: Caller needs to invoke connect logic then call again
555 * other: Some other error occured, the request was not sent
556 */
557 static int xs_udp_send_request(struct rpc_task *task)
558 {
559 struct rpc_rqst *req = task->tk_rqstp;
560 struct rpc_xprt *xprt = req->rq_xprt;
561 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
562 struct xdr_buf *xdr = &req->rq_snd_buf;
563 int status;
564
565 xs_pktdump("packet data:",
566 req->rq_svec->iov_base,
567 req->rq_svec->iov_len);
568
569 req->rq_xtime = jiffies;
570 status = xs_sendpages(transport->sock,
571 xs_addr(xprt),
572 xprt->addrlen, xdr,
573 req->rq_bytes_sent);
574
575 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
576 xdr->len - req->rq_bytes_sent, status);
577
578 if (status >= 0) {
579 task->tk_bytes_sent += status;
580 if (status >= req->rq_slen)
581 return 0;
582 /* Still some bytes left; set up for a retry later. */
583 status = -EAGAIN;
584 }
585
586 switch (status) {
587 case -ENETUNREACH:
588 case -EPIPE:
589 case -ECONNREFUSED:
590 /* When the server has died, an ICMP port unreachable message
591 * prompts ECONNREFUSED. */
592 break;
593 case -EAGAIN:
594 xs_nospace(task);
595 break;
596 default:
597 dprintk("RPC: sendmsg returned unrecognized error %d\n",
598 -status);
599 break;
600 }
601
602 return status;
603 }
604
605 /**
606 * xs_tcp_shutdown - gracefully shut down a TCP socket
607 * @xprt: transport
608 *
609 * Initiates a graceful shutdown of the TCP socket by calling the
610 * equivalent of shutdown(SHUT_WR);
611 */
612 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
613 {
614 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
615 struct socket *sock = transport->sock;
616
617 if (sock != NULL)
618 kernel_sock_shutdown(sock, SHUT_WR);
619 }
620
621 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
622 {
623 u32 reclen = buf->len - sizeof(rpc_fraghdr);
624 rpc_fraghdr *base = buf->head[0].iov_base;
625 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
626 }
627
628 /**
629 * xs_tcp_send_request - write an RPC request to a TCP socket
630 * @task: address of RPC task that manages the state of an RPC request
631 *
632 * Return values:
633 * 0: The request has been sent
634 * EAGAIN: The socket was blocked, please call again later to
635 * complete the request
636 * ENOTCONN: Caller needs to invoke connect logic then call again
637 * other: Some other error occured, the request was not sent
638 *
639 * XXX: In the case of soft timeouts, should we eventually give up
640 * if sendmsg is not able to make progress?
641 */
642 static int xs_tcp_send_request(struct rpc_task *task)
643 {
644 struct rpc_rqst *req = task->tk_rqstp;
645 struct rpc_xprt *xprt = req->rq_xprt;
646 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
647 struct xdr_buf *xdr = &req->rq_snd_buf;
648 int status;
649 unsigned int retry = 0;
650
651 xs_encode_tcp_record_marker(&req->rq_snd_buf);
652
653 xs_pktdump("packet data:",
654 req->rq_svec->iov_base,
655 req->rq_svec->iov_len);
656
657 /* Continue transmitting the packet/record. We must be careful
658 * to cope with writespace callbacks arriving _after_ we have
659 * called sendmsg(). */
660 while (1) {
661 req->rq_xtime = jiffies;
662 status = xs_sendpages(transport->sock,
663 NULL, 0, xdr, req->rq_bytes_sent);
664
665 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
666 xdr->len - req->rq_bytes_sent, status);
667
668 if (unlikely(status < 0))
669 break;
670
671 /* If we've sent the entire packet, immediately
672 * reset the count of bytes sent. */
673 req->rq_bytes_sent += status;
674 task->tk_bytes_sent += status;
675 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676 req->rq_bytes_sent = 0;
677 return 0;
678 }
679
680 status = -EAGAIN;
681 if (retry++ > XS_SENDMSG_RETRY)
682 break;
683 }
684
685 switch (status) {
686 case -EAGAIN:
687 xs_nospace(task);
688 break;
689 case -ECONNREFUSED:
690 case -ECONNRESET:
691 case -ENOTCONN:
692 case -EPIPE:
693 status = -ENOTCONN;
694 break;
695 default:
696 dprintk("RPC: sendmsg returned unrecognized error %d\n",
697 -status);
698 xs_tcp_shutdown(xprt);
699 break;
700 }
701
702 return status;
703 }
704
705 /**
706 * xs_tcp_release_xprt - clean up after a tcp transmission
707 * @xprt: transport
708 * @task: rpc task
709 *
710 * This cleans up if an error causes us to abort the transmission of a request.
711 * In this case, the socket may need to be reset in order to avoid confusing
712 * the server.
713 */
714 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
715 {
716 struct rpc_rqst *req;
717
718 if (task != xprt->snd_task)
719 return;
720 if (task == NULL)
721 goto out_release;
722 req = task->tk_rqstp;
723 if (req->rq_bytes_sent == 0)
724 goto out_release;
725 if (req->rq_bytes_sent == req->rq_snd_buf.len)
726 goto out_release;
727 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
728 out_release:
729 xprt_release_xprt(xprt, task);
730 }
731
732 /**
733 * xs_close - close a socket
734 * @xprt: transport
735 *
736 * This is used when all requests are complete; ie, no DRC state remains
737 * on the server we want to save.
738 */
739 static void xs_close(struct rpc_xprt *xprt)
740 {
741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
742 struct socket *sock = transport->sock;
743 struct sock *sk = transport->inet;
744
745 if (!sk)
746 goto clear_close_wait;
747
748 dprintk("RPC: xs_close xprt %p\n", xprt);
749
750 write_lock_bh(&sk->sk_callback_lock);
751 transport->inet = NULL;
752 transport->sock = NULL;
753
754 sk->sk_user_data = NULL;
755 sk->sk_data_ready = transport->old_data_ready;
756 sk->sk_state_change = transport->old_state_change;
757 sk->sk_write_space = transport->old_write_space;
758 write_unlock_bh(&sk->sk_callback_lock);
759
760 sk->sk_no_check = 0;
761
762 sock_release(sock);
763 clear_close_wait:
764 smp_mb__before_clear_bit();
765 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
766 clear_bit(XPRT_CLOSING, &xprt->state);
767 smp_mb__after_clear_bit();
768 xprt_disconnect_done(xprt);
769 }
770
771 /**
772 * xs_destroy - prepare to shutdown a transport
773 * @xprt: doomed transport
774 *
775 */
776 static void xs_destroy(struct rpc_xprt *xprt)
777 {
778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
779
780 dprintk("RPC: xs_destroy xprt %p\n", xprt);
781
782 cancel_rearming_delayed_work(&transport->connect_worker);
783
784 xs_close(xprt);
785 xs_free_peer_addresses(xprt);
786 kfree(xprt->slot);
787 kfree(xprt);
788 module_put(THIS_MODULE);
789 }
790
791 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
792 {
793 return (struct rpc_xprt *) sk->sk_user_data;
794 }
795
796 /**
797 * xs_udp_data_ready - "data ready" callback for UDP sockets
798 * @sk: socket with data to read
799 * @len: how much data to read
800 *
801 */
802 static void xs_udp_data_ready(struct sock *sk, int len)
803 {
804 struct rpc_task *task;
805 struct rpc_xprt *xprt;
806 struct rpc_rqst *rovr;
807 struct sk_buff *skb;
808 int err, repsize, copied;
809 u32 _xid;
810 __be32 *xp;
811
812 read_lock(&sk->sk_callback_lock);
813 dprintk("RPC: xs_udp_data_ready...\n");
814 if (!(xprt = xprt_from_sock(sk)))
815 goto out;
816
817 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
818 goto out;
819
820 if (xprt->shutdown)
821 goto dropit;
822
823 repsize = skb->len - sizeof(struct udphdr);
824 if (repsize < 4) {
825 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
826 goto dropit;
827 }
828
829 /* Copy the XID from the skb... */
830 xp = skb_header_pointer(skb, sizeof(struct udphdr),
831 sizeof(_xid), &_xid);
832 if (xp == NULL)
833 goto dropit;
834
835 /* Look up and lock the request corresponding to the given XID */
836 spin_lock(&xprt->transport_lock);
837 rovr = xprt_lookup_rqst(xprt, *xp);
838 if (!rovr)
839 goto out_unlock;
840 task = rovr->rq_task;
841
842 if ((copied = rovr->rq_private_buf.buflen) > repsize)
843 copied = repsize;
844
845 /* Suck it into the iovec, verify checksum if not done by hw. */
846 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
847 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
848 goto out_unlock;
849 }
850
851 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
852
853 /* Something worked... */
854 dst_confirm(skb->dst);
855
856 xprt_adjust_cwnd(task, copied);
857 xprt_update_rtt(task);
858 xprt_complete_rqst(task, copied);
859
860 out_unlock:
861 spin_unlock(&xprt->transport_lock);
862 dropit:
863 skb_free_datagram(sk, skb);
864 out:
865 read_unlock(&sk->sk_callback_lock);
866 }
867
868 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
869 {
870 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
871 size_t len, used;
872 char *p;
873
874 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
875 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
876 used = xdr_skb_read_bits(desc, p, len);
877 transport->tcp_offset += used;
878 if (used != len)
879 return;
880
881 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
882 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
883 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
884 else
885 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
886 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
887
888 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
889 transport->tcp_offset = 0;
890
891 /* Sanity check of the record length */
892 if (unlikely(transport->tcp_reclen < 4)) {
893 dprintk("RPC: invalid TCP record fragment length\n");
894 xprt_force_disconnect(xprt);
895 return;
896 }
897 dprintk("RPC: reading TCP record fragment of length %d\n",
898 transport->tcp_reclen);
899 }
900
901 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
902 {
903 if (transport->tcp_offset == transport->tcp_reclen) {
904 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
905 transport->tcp_offset = 0;
906 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
907 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
908 transport->tcp_flags |= TCP_RCV_COPY_XID;
909 transport->tcp_copied = 0;
910 }
911 }
912 }
913
914 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
915 {
916 size_t len, used;
917 char *p;
918
919 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
920 dprintk("RPC: reading XID (%Zu bytes)\n", len);
921 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
922 used = xdr_skb_read_bits(desc, p, len);
923 transport->tcp_offset += used;
924 if (used != len)
925 return;
926 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
927 transport->tcp_flags |= TCP_RCV_COPY_DATA;
928 transport->tcp_copied = 4;
929 dprintk("RPC: reading reply for XID %08x\n",
930 ntohl(transport->tcp_xid));
931 xs_tcp_check_fraghdr(transport);
932 }
933
934 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
935 {
936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
937 struct rpc_rqst *req;
938 struct xdr_buf *rcvbuf;
939 size_t len;
940 ssize_t r;
941
942 /* Find and lock the request corresponding to this xid */
943 spin_lock(&xprt->transport_lock);
944 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
945 if (!req) {
946 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
947 dprintk("RPC: XID %08x request not found!\n",
948 ntohl(transport->tcp_xid));
949 spin_unlock(&xprt->transport_lock);
950 return;
951 }
952
953 rcvbuf = &req->rq_private_buf;
954 len = desc->count;
955 if (len > transport->tcp_reclen - transport->tcp_offset) {
956 struct xdr_skb_reader my_desc;
957
958 len = transport->tcp_reclen - transport->tcp_offset;
959 memcpy(&my_desc, desc, sizeof(my_desc));
960 my_desc.count = len;
961 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
962 &my_desc, xdr_skb_read_bits);
963 desc->count -= r;
964 desc->offset += r;
965 } else
966 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
967 desc, xdr_skb_read_bits);
968
969 if (r > 0) {
970 transport->tcp_copied += r;
971 transport->tcp_offset += r;
972 }
973 if (r != len) {
974 /* Error when copying to the receive buffer,
975 * usually because we weren't able to allocate
976 * additional buffer pages. All we can do now
977 * is turn off TCP_RCV_COPY_DATA, so the request
978 * will not receive any additional updates,
979 * and time out.
980 * Any remaining data from this record will
981 * be discarded.
982 */
983 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
984 dprintk("RPC: XID %08x truncated request\n",
985 ntohl(transport->tcp_xid));
986 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
987 "tcp_offset = %u, tcp_reclen = %u\n",
988 xprt, transport->tcp_copied,
989 transport->tcp_offset, transport->tcp_reclen);
990 goto out;
991 }
992
993 dprintk("RPC: XID %08x read %Zd bytes\n",
994 ntohl(transport->tcp_xid), r);
995 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
996 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
997 transport->tcp_offset, transport->tcp_reclen);
998
999 if (transport->tcp_copied == req->rq_private_buf.buflen)
1000 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1001 else if (transport->tcp_offset == transport->tcp_reclen) {
1002 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1003 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1004 }
1005
1006 out:
1007 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1008 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1009 spin_unlock(&xprt->transport_lock);
1010 xs_tcp_check_fraghdr(transport);
1011 }
1012
1013 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1014 {
1015 size_t len;
1016
1017 len = transport->tcp_reclen - transport->tcp_offset;
1018 if (len > desc->count)
1019 len = desc->count;
1020 desc->count -= len;
1021 desc->offset += len;
1022 transport->tcp_offset += len;
1023 dprintk("RPC: discarded %Zu bytes\n", len);
1024 xs_tcp_check_fraghdr(transport);
1025 }
1026
1027 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1028 {
1029 struct rpc_xprt *xprt = rd_desc->arg.data;
1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1031 struct xdr_skb_reader desc = {
1032 .skb = skb,
1033 .offset = offset,
1034 .count = len,
1035 };
1036
1037 dprintk("RPC: xs_tcp_data_recv started\n");
1038 do {
1039 /* Read in a new fragment marker if necessary */
1040 /* Can we ever really expect to get completely empty fragments? */
1041 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1042 xs_tcp_read_fraghdr(xprt, &desc);
1043 continue;
1044 }
1045 /* Read in the xid if necessary */
1046 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1047 xs_tcp_read_xid(transport, &desc);
1048 continue;
1049 }
1050 /* Read in the request data */
1051 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1052 xs_tcp_read_request(xprt, &desc);
1053 continue;
1054 }
1055 /* Skip over any trailing bytes on short reads */
1056 xs_tcp_read_discard(transport, &desc);
1057 } while (desc.count);
1058 dprintk("RPC: xs_tcp_data_recv done\n");
1059 return len - desc.count;
1060 }
1061
1062 /**
1063 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1064 * @sk: socket with data to read
1065 * @bytes: how much data to read
1066 *
1067 */
1068 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1069 {
1070 struct rpc_xprt *xprt;
1071 read_descriptor_t rd_desc;
1072
1073 dprintk("RPC: xs_tcp_data_ready...\n");
1074
1075 read_lock(&sk->sk_callback_lock);
1076 if (!(xprt = xprt_from_sock(sk)))
1077 goto out;
1078 if (xprt->shutdown)
1079 goto out;
1080
1081 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1082 rd_desc.arg.data = xprt;
1083 rd_desc.count = 65536;
1084 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1085 out:
1086 read_unlock(&sk->sk_callback_lock);
1087 }
1088
1089 /**
1090 * xs_tcp_state_change - callback to handle TCP socket state changes
1091 * @sk: socket whose state has changed
1092 *
1093 */
1094 static void xs_tcp_state_change(struct sock *sk)
1095 {
1096 struct rpc_xprt *xprt;
1097
1098 read_lock(&sk->sk_callback_lock);
1099 if (!(xprt = xprt_from_sock(sk)))
1100 goto out;
1101 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1102 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1103 sk->sk_state, xprt_connected(xprt),
1104 sock_flag(sk, SOCK_DEAD),
1105 sock_flag(sk, SOCK_ZAPPED));
1106
1107 switch (sk->sk_state) {
1108 case TCP_ESTABLISHED:
1109 spin_lock_bh(&xprt->transport_lock);
1110 if (!xprt_test_and_set_connected(xprt)) {
1111 struct sock_xprt *transport = container_of(xprt,
1112 struct sock_xprt, xprt);
1113
1114 /* Reset TCP record info */
1115 transport->tcp_offset = 0;
1116 transport->tcp_reclen = 0;
1117 transport->tcp_copied = 0;
1118 transport->tcp_flags =
1119 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1120
1121 xprt_wake_pending_tasks(xprt, 0);
1122 }
1123 spin_unlock_bh(&xprt->transport_lock);
1124 break;
1125 case TCP_FIN_WAIT1:
1126 /* The client initiated a shutdown of the socket */
1127 xprt->reestablish_timeout = 0;
1128 set_bit(XPRT_CLOSING, &xprt->state);
1129 smp_mb__before_clear_bit();
1130 clear_bit(XPRT_CONNECTED, &xprt->state);
1131 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1132 smp_mb__after_clear_bit();
1133 break;
1134 case TCP_CLOSE_WAIT:
1135 /* The server initiated a shutdown of the socket */
1136 set_bit(XPRT_CLOSING, &xprt->state);
1137 xprt_force_disconnect(xprt);
1138 case TCP_SYN_SENT:
1139 case TCP_CLOSING:
1140 /*
1141 * If the server closed down the connection, make sure that
1142 * we back off before reconnecting
1143 */
1144 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1145 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1146 break;
1147 case TCP_LAST_ACK:
1148 smp_mb__before_clear_bit();
1149 clear_bit(XPRT_CONNECTED, &xprt->state);
1150 smp_mb__after_clear_bit();
1151 break;
1152 case TCP_CLOSE:
1153 smp_mb__before_clear_bit();
1154 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1155 clear_bit(XPRT_CLOSING, &xprt->state);
1156 smp_mb__after_clear_bit();
1157 /* Mark transport as closed and wake up all pending tasks */
1158 xprt_disconnect_done(xprt);
1159 }
1160 out:
1161 read_unlock(&sk->sk_callback_lock);
1162 }
1163
1164 /**
1165 * xs_udp_write_space - callback invoked when socket buffer space
1166 * becomes available
1167 * @sk: socket whose state has changed
1168 *
1169 * Called when more output buffer space is available for this socket.
1170 * We try not to wake our writers until they can make "significant"
1171 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1172 * with a bunch of small requests.
1173 */
1174 static void xs_udp_write_space(struct sock *sk)
1175 {
1176 read_lock(&sk->sk_callback_lock);
1177
1178 /* from net/core/sock.c:sock_def_write_space */
1179 if (sock_writeable(sk)) {
1180 struct socket *sock;
1181 struct rpc_xprt *xprt;
1182
1183 if (unlikely(!(sock = sk->sk_socket)))
1184 goto out;
1185 if (unlikely(!(xprt = xprt_from_sock(sk))))
1186 goto out;
1187 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1188 goto out;
1189
1190 xprt_write_space(xprt);
1191 }
1192
1193 out:
1194 read_unlock(&sk->sk_callback_lock);
1195 }
1196
1197 /**
1198 * xs_tcp_write_space - callback invoked when socket buffer space
1199 * becomes available
1200 * @sk: socket whose state has changed
1201 *
1202 * Called when more output buffer space is available for this socket.
1203 * We try not to wake our writers until they can make "significant"
1204 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1205 * with a bunch of small requests.
1206 */
1207 static void xs_tcp_write_space(struct sock *sk)
1208 {
1209 read_lock(&sk->sk_callback_lock);
1210
1211 /* from net/core/stream.c:sk_stream_write_space */
1212 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1213 struct socket *sock;
1214 struct rpc_xprt *xprt;
1215
1216 if (unlikely(!(sock = sk->sk_socket)))
1217 goto out;
1218 if (unlikely(!(xprt = xprt_from_sock(sk))))
1219 goto out;
1220 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1221 goto out;
1222
1223 xprt_write_space(xprt);
1224 }
1225
1226 out:
1227 read_unlock(&sk->sk_callback_lock);
1228 }
1229
1230 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1231 {
1232 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1233 struct sock *sk = transport->inet;
1234
1235 if (transport->rcvsize) {
1236 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1237 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1238 }
1239 if (transport->sndsize) {
1240 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1241 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1242 sk->sk_write_space(sk);
1243 }
1244 }
1245
1246 /**
1247 * xs_udp_set_buffer_size - set send and receive limits
1248 * @xprt: generic transport
1249 * @sndsize: requested size of send buffer, in bytes
1250 * @rcvsize: requested size of receive buffer, in bytes
1251 *
1252 * Set socket send and receive buffer size limits.
1253 */
1254 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1255 {
1256 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1257
1258 transport->sndsize = 0;
1259 if (sndsize)
1260 transport->sndsize = sndsize + 1024;
1261 transport->rcvsize = 0;
1262 if (rcvsize)
1263 transport->rcvsize = rcvsize + 1024;
1264
1265 xs_udp_do_set_buffer_size(xprt);
1266 }
1267
1268 /**
1269 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1270 * @task: task that timed out
1271 *
1272 * Adjust the congestion window after a retransmit timeout has occurred.
1273 */
1274 static void xs_udp_timer(struct rpc_task *task)
1275 {
1276 xprt_adjust_cwnd(task, -ETIMEDOUT);
1277 }
1278
1279 static unsigned short xs_get_random_port(void)
1280 {
1281 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1282 unsigned short rand = (unsigned short) net_random() % range;
1283 return rand + xprt_min_resvport;
1284 }
1285
1286 /**
1287 * xs_set_port - reset the port number in the remote endpoint address
1288 * @xprt: generic transport
1289 * @port: new port number
1290 *
1291 */
1292 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1293 {
1294 struct sockaddr *addr = xs_addr(xprt);
1295
1296 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1297
1298 switch (addr->sa_family) {
1299 case AF_INET:
1300 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1301 break;
1302 case AF_INET6:
1303 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1304 break;
1305 default:
1306 BUG();
1307 }
1308 }
1309
1310 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1311 {
1312 unsigned short port = transport->port;
1313
1314 if (port == 0 && transport->xprt.resvport)
1315 port = xs_get_random_port();
1316 return port;
1317 }
1318
1319 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1320 {
1321 if (transport->port != 0)
1322 transport->port = 0;
1323 if (!transport->xprt.resvport)
1324 return 0;
1325 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1326 return xprt_max_resvport;
1327 return --port;
1328 }
1329
1330 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1331 {
1332 struct sockaddr_in myaddr = {
1333 .sin_family = AF_INET,
1334 };
1335 struct sockaddr_in *sa;
1336 int err, nloop = 0;
1337 unsigned short port = xs_get_srcport(transport, sock);
1338 unsigned short last;
1339
1340 sa = (struct sockaddr_in *)&transport->addr;
1341 myaddr.sin_addr = sa->sin_addr;
1342 do {
1343 myaddr.sin_port = htons(port);
1344 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1345 sizeof(myaddr));
1346 if (port == 0)
1347 break;
1348 if (err == 0) {
1349 transport->port = port;
1350 break;
1351 }
1352 last = port;
1353 port = xs_next_srcport(transport, sock, port);
1354 if (port > last)
1355 nloop++;
1356 } while (err == -EADDRINUSE && nloop != 2);
1357 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1358 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1359 port, err ? "failed" : "ok", err);
1360 return err;
1361 }
1362
1363 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1364 {
1365 struct sockaddr_in6 myaddr = {
1366 .sin6_family = AF_INET6,
1367 };
1368 struct sockaddr_in6 *sa;
1369 int err, nloop = 0;
1370 unsigned short port = xs_get_srcport(transport, sock);
1371 unsigned short last;
1372
1373 sa = (struct sockaddr_in6 *)&transport->addr;
1374 myaddr.sin6_addr = sa->sin6_addr;
1375 do {
1376 myaddr.sin6_port = htons(port);
1377 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1378 sizeof(myaddr));
1379 if (port == 0)
1380 break;
1381 if (err == 0) {
1382 transport->port = port;
1383 break;
1384 }
1385 last = port;
1386 port = xs_next_srcport(transport, sock, port);
1387 if (port > last)
1388 nloop++;
1389 } while (err == -EADDRINUSE && nloop != 2);
1390 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1391 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1392 return err;
1393 }
1394
1395 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1396 static struct lock_class_key xs_key[2];
1397 static struct lock_class_key xs_slock_key[2];
1398
1399 static inline void xs_reclassify_socket4(struct socket *sock)
1400 {
1401 struct sock *sk = sock->sk;
1402
1403 BUG_ON(sock_owned_by_user(sk));
1404 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1405 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1406 }
1407
1408 static inline void xs_reclassify_socket6(struct socket *sock)
1409 {
1410 struct sock *sk = sock->sk;
1411
1412 BUG_ON(sock_owned_by_user(sk));
1413 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1414 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1415 }
1416 #else
1417 static inline void xs_reclassify_socket4(struct socket *sock)
1418 {
1419 }
1420
1421 static inline void xs_reclassify_socket6(struct socket *sock)
1422 {
1423 }
1424 #endif
1425
1426 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1427 {
1428 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1429
1430 if (!transport->inet) {
1431 struct sock *sk = sock->sk;
1432
1433 write_lock_bh(&sk->sk_callback_lock);
1434
1435 sk->sk_user_data = xprt;
1436 transport->old_data_ready = sk->sk_data_ready;
1437 transport->old_state_change = sk->sk_state_change;
1438 transport->old_write_space = sk->sk_write_space;
1439 sk->sk_data_ready = xs_udp_data_ready;
1440 sk->sk_write_space = xs_udp_write_space;
1441 sk->sk_no_check = UDP_CSUM_NORCV;
1442 sk->sk_allocation = GFP_ATOMIC;
1443
1444 xprt_set_connected(xprt);
1445
1446 /* Reset to new socket */
1447 transport->sock = sock;
1448 transport->inet = sk;
1449
1450 write_unlock_bh(&sk->sk_callback_lock);
1451 }
1452 xs_udp_do_set_buffer_size(xprt);
1453 }
1454
1455 /**
1456 * xs_udp_connect_worker4 - set up a UDP socket
1457 * @work: RPC transport to connect
1458 *
1459 * Invoked by a work queue tasklet.
1460 */
1461 static void xs_udp_connect_worker4(struct work_struct *work)
1462 {
1463 struct sock_xprt *transport =
1464 container_of(work, struct sock_xprt, connect_worker.work);
1465 struct rpc_xprt *xprt = &transport->xprt;
1466 struct socket *sock = transport->sock;
1467 int err, status = -EIO;
1468
1469 if (xprt->shutdown || !xprt_bound(xprt))
1470 goto out;
1471
1472 /* Start by resetting any existing state */
1473 xs_close(xprt);
1474
1475 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1476 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1477 goto out;
1478 }
1479 xs_reclassify_socket4(sock);
1480
1481 if (xs_bind4(transport, sock)) {
1482 sock_release(sock);
1483 goto out;
1484 }
1485
1486 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1487 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1488
1489 xs_udp_finish_connecting(xprt, sock);
1490 status = 0;
1491 out:
1492 xprt_wake_pending_tasks(xprt, status);
1493 xprt_clear_connecting(xprt);
1494 }
1495
1496 /**
1497 * xs_udp_connect_worker6 - set up a UDP socket
1498 * @work: RPC transport to connect
1499 *
1500 * Invoked by a work queue tasklet.
1501 */
1502 static void xs_udp_connect_worker6(struct work_struct *work)
1503 {
1504 struct sock_xprt *transport =
1505 container_of(work, struct sock_xprt, connect_worker.work);
1506 struct rpc_xprt *xprt = &transport->xprt;
1507 struct socket *sock = transport->sock;
1508 int err, status = -EIO;
1509
1510 if (xprt->shutdown || !xprt_bound(xprt))
1511 goto out;
1512
1513 /* Start by resetting any existing state */
1514 xs_close(xprt);
1515
1516 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1517 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1518 goto out;
1519 }
1520 xs_reclassify_socket6(sock);
1521
1522 if (xs_bind6(transport, sock) < 0) {
1523 sock_release(sock);
1524 goto out;
1525 }
1526
1527 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1528 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1529
1530 xs_udp_finish_connecting(xprt, sock);
1531 status = 0;
1532 out:
1533 xprt_wake_pending_tasks(xprt, status);
1534 xprt_clear_connecting(xprt);
1535 }
1536
1537 /*
1538 * We need to preserve the port number so the reply cache on the server can
1539 * find our cached RPC replies when we get around to reconnecting.
1540 */
1541 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1542 {
1543 int result;
1544 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1545 struct sockaddr any;
1546
1547 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1548
1549 /*
1550 * Disconnect the transport socket by doing a connect operation
1551 * with AF_UNSPEC. This should return immediately...
1552 */
1553 memset(&any, 0, sizeof(any));
1554 any.sa_family = AF_UNSPEC;
1555 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1556 if (result)
1557 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1558 result);
1559 }
1560
1561 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1562 {
1563 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1564
1565 if (!transport->inet) {
1566 struct sock *sk = sock->sk;
1567
1568 write_lock_bh(&sk->sk_callback_lock);
1569
1570 sk->sk_user_data = xprt;
1571 transport->old_data_ready = sk->sk_data_ready;
1572 transport->old_state_change = sk->sk_state_change;
1573 transport->old_write_space = sk->sk_write_space;
1574 sk->sk_data_ready = xs_tcp_data_ready;
1575 sk->sk_state_change = xs_tcp_state_change;
1576 sk->sk_write_space = xs_tcp_write_space;
1577 sk->sk_allocation = GFP_ATOMIC;
1578
1579 /* socket options */
1580 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1581 sock_reset_flag(sk, SOCK_LINGER);
1582 tcp_sk(sk)->linger2 = 0;
1583 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1584
1585 xprt_clear_connected(xprt);
1586
1587 /* Reset to new socket */
1588 transport->sock = sock;
1589 transport->inet = sk;
1590
1591 write_unlock_bh(&sk->sk_callback_lock);
1592 }
1593
1594 /* Tell the socket layer to start connecting... */
1595 xprt->stat.connect_count++;
1596 xprt->stat.connect_start = jiffies;
1597 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1598 }
1599
1600 /**
1601 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1602 * @work: RPC transport to connect
1603 *
1604 * Invoked by a work queue tasklet.
1605 */
1606 static void xs_tcp_connect_worker4(struct work_struct *work)
1607 {
1608 struct sock_xprt *transport =
1609 container_of(work, struct sock_xprt, connect_worker.work);
1610 struct rpc_xprt *xprt = &transport->xprt;
1611 struct socket *sock = transport->sock;
1612 int err, status = -EIO;
1613
1614 if (xprt->shutdown || !xprt_bound(xprt))
1615 goto out;
1616
1617 if (!sock) {
1618 /* start from scratch */
1619 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1620 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1621 goto out;
1622 }
1623 xs_reclassify_socket4(sock);
1624
1625 if (xs_bind4(transport, sock) < 0) {
1626 sock_release(sock);
1627 goto out;
1628 }
1629 } else
1630 /* "close" the socket, preserving the local port */
1631 xs_tcp_reuse_connection(xprt);
1632
1633 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1634 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1635
1636 status = xs_tcp_finish_connecting(xprt, sock);
1637 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1638 xprt, -status, xprt_connected(xprt),
1639 sock->sk->sk_state);
1640 if (status < 0) {
1641 switch (status) {
1642 case -EINPROGRESS:
1643 case -EALREADY:
1644 goto out_clear;
1645 case -ECONNREFUSED:
1646 case -ECONNRESET:
1647 /* retry with existing socket, after a delay */
1648 break;
1649 default:
1650 /* get rid of existing socket, and retry */
1651 xs_tcp_shutdown(xprt);
1652 }
1653 }
1654 out:
1655 xprt_wake_pending_tasks(xprt, status);
1656 out_clear:
1657 xprt_clear_connecting(xprt);
1658 }
1659
1660 /**
1661 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1662 * @work: RPC transport to connect
1663 *
1664 * Invoked by a work queue tasklet.
1665 */
1666 static void xs_tcp_connect_worker6(struct work_struct *work)
1667 {
1668 struct sock_xprt *transport =
1669 container_of(work, struct sock_xprt, connect_worker.work);
1670 struct rpc_xprt *xprt = &transport->xprt;
1671 struct socket *sock = transport->sock;
1672 int err, status = -EIO;
1673
1674 if (xprt->shutdown || !xprt_bound(xprt))
1675 goto out;
1676
1677 if (!sock) {
1678 /* start from scratch */
1679 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1680 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1681 goto out;
1682 }
1683 xs_reclassify_socket6(sock);
1684
1685 if (xs_bind6(transport, sock) < 0) {
1686 sock_release(sock);
1687 goto out;
1688 }
1689 } else
1690 /* "close" the socket, preserving the local port */
1691 xs_tcp_reuse_connection(xprt);
1692
1693 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1694 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1695
1696 status = xs_tcp_finish_connecting(xprt, sock);
1697 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1698 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1699 if (status < 0) {
1700 switch (status) {
1701 case -EINPROGRESS:
1702 case -EALREADY:
1703 goto out_clear;
1704 case -ECONNREFUSED:
1705 case -ECONNRESET:
1706 /* retry with existing socket, after a delay */
1707 break;
1708 default:
1709 /* get rid of existing socket, and retry */
1710 xs_tcp_shutdown(xprt);
1711 }
1712 }
1713 out:
1714 xprt_wake_pending_tasks(xprt, status);
1715 out_clear:
1716 xprt_clear_connecting(xprt);
1717 }
1718
1719 /**
1720 * xs_connect - connect a socket to a remote endpoint
1721 * @task: address of RPC task that manages state of connect request
1722 *
1723 * TCP: If the remote end dropped the connection, delay reconnecting.
1724 *
1725 * UDP socket connects are synchronous, but we use a work queue anyway
1726 * to guarantee that even unprivileged user processes can set up a
1727 * socket on a privileged port.
1728 *
1729 * If a UDP socket connect fails, the delay behavior here prevents
1730 * retry floods (hard mounts).
1731 */
1732 static void xs_connect(struct rpc_task *task)
1733 {
1734 struct rpc_xprt *xprt = task->tk_xprt;
1735 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1736
1737 if (xprt_test_and_set_connecting(xprt))
1738 return;
1739
1740 if (transport->sock != NULL) {
1741 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1742 "seconds\n",
1743 xprt, xprt->reestablish_timeout / HZ);
1744 queue_delayed_work(rpciod_workqueue,
1745 &transport->connect_worker,
1746 xprt->reestablish_timeout);
1747 xprt->reestablish_timeout <<= 1;
1748 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1749 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1750 } else {
1751 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1752 queue_delayed_work(rpciod_workqueue,
1753 &transport->connect_worker, 0);
1754 }
1755 }
1756
1757 static void xs_tcp_connect(struct rpc_task *task)
1758 {
1759 struct rpc_xprt *xprt = task->tk_xprt;
1760
1761 /* Initiate graceful shutdown of the socket if not already done */
1762 if (test_bit(XPRT_CONNECTED, &xprt->state))
1763 xs_tcp_shutdown(xprt);
1764 /* Exit if we need to wait for socket shutdown to complete */
1765 if (test_bit(XPRT_CLOSING, &xprt->state))
1766 return;
1767 xs_connect(task);
1768 }
1769
1770 /**
1771 * xs_udp_print_stats - display UDP socket-specifc stats
1772 * @xprt: rpc_xprt struct containing statistics
1773 * @seq: output file
1774 *
1775 */
1776 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1777 {
1778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1779
1780 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1781 transport->port,
1782 xprt->stat.bind_count,
1783 xprt->stat.sends,
1784 xprt->stat.recvs,
1785 xprt->stat.bad_xids,
1786 xprt->stat.req_u,
1787 xprt->stat.bklog_u);
1788 }
1789
1790 /**
1791 * xs_tcp_print_stats - display TCP socket-specifc stats
1792 * @xprt: rpc_xprt struct containing statistics
1793 * @seq: output file
1794 *
1795 */
1796 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1797 {
1798 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1799 long idle_time = 0;
1800
1801 if (xprt_connected(xprt))
1802 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1803
1804 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1805 transport->port,
1806 xprt->stat.bind_count,
1807 xprt->stat.connect_count,
1808 xprt->stat.connect_time,
1809 idle_time,
1810 xprt->stat.sends,
1811 xprt->stat.recvs,
1812 xprt->stat.bad_xids,
1813 xprt->stat.req_u,
1814 xprt->stat.bklog_u);
1815 }
1816
1817 static struct rpc_xprt_ops xs_udp_ops = {
1818 .set_buffer_size = xs_udp_set_buffer_size,
1819 .reserve_xprt = xprt_reserve_xprt_cong,
1820 .release_xprt = xprt_release_xprt_cong,
1821 .rpcbind = rpcb_getport_async,
1822 .set_port = xs_set_port,
1823 .connect = xs_connect,
1824 .buf_alloc = rpc_malloc,
1825 .buf_free = rpc_free,
1826 .send_request = xs_udp_send_request,
1827 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1828 .timer = xs_udp_timer,
1829 .release_request = xprt_release_rqst_cong,
1830 .close = xs_close,
1831 .destroy = xs_destroy,
1832 .print_stats = xs_udp_print_stats,
1833 };
1834
1835 static struct rpc_xprt_ops xs_tcp_ops = {
1836 .reserve_xprt = xprt_reserve_xprt,
1837 .release_xprt = xs_tcp_release_xprt,
1838 .rpcbind = rpcb_getport_async,
1839 .set_port = xs_set_port,
1840 .connect = xs_tcp_connect,
1841 .buf_alloc = rpc_malloc,
1842 .buf_free = rpc_free,
1843 .send_request = xs_tcp_send_request,
1844 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1845 .close = xs_tcp_shutdown,
1846 .destroy = xs_destroy,
1847 .print_stats = xs_tcp_print_stats,
1848 };
1849
1850 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1851 unsigned int slot_table_size)
1852 {
1853 struct rpc_xprt *xprt;
1854 struct sock_xprt *new;
1855
1856 if (args->addrlen > sizeof(xprt->addr)) {
1857 dprintk("RPC: xs_setup_xprt: address too large\n");
1858 return ERR_PTR(-EBADF);
1859 }
1860
1861 new = kzalloc(sizeof(*new), GFP_KERNEL);
1862 if (new == NULL) {
1863 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1864 "rpc_xprt\n");
1865 return ERR_PTR(-ENOMEM);
1866 }
1867 xprt = &new->xprt;
1868
1869 xprt->max_reqs = slot_table_size;
1870 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1871 if (xprt->slot == NULL) {
1872 kfree(xprt);
1873 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1874 "table\n");
1875 return ERR_PTR(-ENOMEM);
1876 }
1877
1878 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1879 xprt->addrlen = args->addrlen;
1880 if (args->srcaddr)
1881 memcpy(&new->addr, args->srcaddr, args->addrlen);
1882
1883 return xprt;
1884 }
1885
1886 static const struct rpc_timeout xs_udp_default_timeout = {
1887 .to_initval = 5 * HZ,
1888 .to_maxval = 30 * HZ,
1889 .to_increment = 5 * HZ,
1890 .to_retries = 5,
1891 };
1892
1893 /**
1894 * xs_setup_udp - Set up transport to use a UDP socket
1895 * @args: rpc transport creation arguments
1896 *
1897 */
1898 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1899 {
1900 struct sockaddr *addr = args->dstaddr;
1901 struct rpc_xprt *xprt;
1902 struct sock_xprt *transport;
1903
1904 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1905 if (IS_ERR(xprt))
1906 return xprt;
1907 transport = container_of(xprt, struct sock_xprt, xprt);
1908
1909 xprt->prot = IPPROTO_UDP;
1910 xprt->tsh_size = 0;
1911 /* XXX: header size can vary due to auth type, IPv6, etc. */
1912 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1913
1914 xprt->bind_timeout = XS_BIND_TO;
1915 xprt->connect_timeout = XS_UDP_CONN_TO;
1916 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1917 xprt->idle_timeout = XS_IDLE_DISC_TO;
1918
1919 xprt->ops = &xs_udp_ops;
1920
1921 xprt->timeout = &xs_udp_default_timeout;
1922
1923 switch (addr->sa_family) {
1924 case AF_INET:
1925 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1926 xprt_set_bound(xprt);
1927
1928 INIT_DELAYED_WORK(&transport->connect_worker,
1929 xs_udp_connect_worker4);
1930 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1931 break;
1932 case AF_INET6:
1933 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1934 xprt_set_bound(xprt);
1935
1936 INIT_DELAYED_WORK(&transport->connect_worker,
1937 xs_udp_connect_worker6);
1938 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1939 break;
1940 default:
1941 kfree(xprt);
1942 return ERR_PTR(-EAFNOSUPPORT);
1943 }
1944
1945 dprintk("RPC: set up transport to address %s\n",
1946 xprt->address_strings[RPC_DISPLAY_ALL]);
1947
1948 if (try_module_get(THIS_MODULE))
1949 return xprt;
1950
1951 kfree(xprt->slot);
1952 kfree(xprt);
1953 return ERR_PTR(-EINVAL);
1954 }
1955
1956 static const struct rpc_timeout xs_tcp_default_timeout = {
1957 .to_initval = 60 * HZ,
1958 .to_maxval = 60 * HZ,
1959 .to_retries = 2,
1960 };
1961
1962 /**
1963 * xs_setup_tcp - Set up transport to use a TCP socket
1964 * @args: rpc transport creation arguments
1965 *
1966 */
1967 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1968 {
1969 struct sockaddr *addr = args->dstaddr;
1970 struct rpc_xprt *xprt;
1971 struct sock_xprt *transport;
1972
1973 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1974 if (IS_ERR(xprt))
1975 return xprt;
1976 transport = container_of(xprt, struct sock_xprt, xprt);
1977
1978 xprt->prot = IPPROTO_TCP;
1979 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1980 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1981
1982 xprt->bind_timeout = XS_BIND_TO;
1983 xprt->connect_timeout = XS_TCP_CONN_TO;
1984 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1985 xprt->idle_timeout = XS_IDLE_DISC_TO;
1986
1987 xprt->ops = &xs_tcp_ops;
1988 xprt->timeout = &xs_tcp_default_timeout;
1989
1990 switch (addr->sa_family) {
1991 case AF_INET:
1992 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1993 xprt_set_bound(xprt);
1994
1995 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1996 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
1997 break;
1998 case AF_INET6:
1999 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2000 xprt_set_bound(xprt);
2001
2002 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2003 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2004 break;
2005 default:
2006 kfree(xprt);
2007 return ERR_PTR(-EAFNOSUPPORT);
2008 }
2009
2010 dprintk("RPC: set up transport to address %s\n",
2011 xprt->address_strings[RPC_DISPLAY_ALL]);
2012
2013 if (try_module_get(THIS_MODULE))
2014 return xprt;
2015
2016 kfree(xprt->slot);
2017 kfree(xprt);
2018 return ERR_PTR(-EINVAL);
2019 }
2020
2021 static struct xprt_class xs_udp_transport = {
2022 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2023 .name = "udp",
2024 .owner = THIS_MODULE,
2025 .ident = IPPROTO_UDP,
2026 .setup = xs_setup_udp,
2027 };
2028
2029 static struct xprt_class xs_tcp_transport = {
2030 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2031 .name = "tcp",
2032 .owner = THIS_MODULE,
2033 .ident = IPPROTO_TCP,
2034 .setup = xs_setup_tcp,
2035 };
2036
2037 /**
2038 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2039 *
2040 */
2041 int init_socket_xprt(void)
2042 {
2043 #ifdef RPC_DEBUG
2044 if (!sunrpc_table_header)
2045 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2046 #endif
2047
2048 xprt_register_transport(&xs_udp_transport);
2049 xprt_register_transport(&xs_tcp_transport);
2050
2051 return 0;
2052 }
2053
2054 /**
2055 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2056 *
2057 */
2058 void cleanup_socket_xprt(void)
2059 {
2060 #ifdef RPC_DEBUG
2061 if (sunrpc_table_header) {
2062 unregister_sysctl_table(sunrpc_table_header);
2063 sunrpc_table_header = NULL;
2064 }
2065 #endif
2066
2067 xprt_unregister_transport(&xs_udp_transport);
2068 xprt_unregister_transport(&xs_tcp_transport);
2069 }