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Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[deliverable/linux.git] / net / sunrpc / xprtsock.c
... / ...
CommitLineData
1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
19 */
20
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/capability.h>
26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
32#include <linux/un.h>
33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
36#include <linux/sunrpc/addr.h>
37#include <linux/sunrpc/sched.h>
38#include <linux/sunrpc/svcsock.h>
39#include <linux/sunrpc/xprtsock.h>
40#include <linux/file.h>
41#ifdef CONFIG_SUNRPC_BACKCHANNEL
42#include <linux/sunrpc/bc_xprt.h>
43#endif
44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
50#include <trace/events/sunrpc.h>
51
52#include "sunrpc.h"
53
54static void xs_close(struct rpc_xprt *xprt);
55
56/*
57 * xprtsock tunables
58 */
59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
65
66#define XS_TCP_LINGER_TO (15U * HZ)
67static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
68
69/*
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
73 *
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
76 */
77
78#ifdef RPC_DEBUG
79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
92static struct ctl_table xs_tunables_table[] = {
93 {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
120 {
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_jiffies,
144 },
145 { },
146};
147
148static struct ctl_table sunrpc_table[] = {
149 {
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
154 { },
155};
156
157#endif
158
159/*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
189#ifdef RPC_DEBUG
190# undef RPC_DEBUG_DATA
191# define RPCDBG_FACILITY RPCDBG_TRANS
192#endif
193
194#ifdef RPC_DEBUG_DATA
195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196{
197 u8 *buf = (u8 *) packet;
198 int j;
199
200 dprintk("RPC: %s\n", msg);
201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214{
215 /* NOP */
216}
217#endif
218
219struct sock_xprt {
220 struct rpc_xprt xprt;
221
222 /*
223 * Network layer
224 */
225 struct socket * sock;
226 struct sock * inet;
227
228 /*
229 * State of TCP reply receive
230 */
231 __be32 tcp_fraghdr,
232 tcp_xid,
233 tcp_calldir;
234
235 u32 tcp_offset,
236 tcp_reclen;
237
238 unsigned long tcp_copied,
239 tcp_flags;
240
241 /*
242 * Connection of transports
243 */
244 struct delayed_work connect_worker;
245 struct sockaddr_storage srcaddr;
246 unsigned short srcport;
247
248 /*
249 * UDP socket buffer size parameters
250 */
251 size_t rcvsize,
252 sndsize;
253
254 /*
255 * Saved socket callback addresses
256 */
257 void (*old_data_ready)(struct sock *);
258 void (*old_state_change)(struct sock *);
259 void (*old_write_space)(struct sock *);
260 void (*old_error_report)(struct sock *);
261};
262
263/*
264 * TCP receive state flags
265 */
266#define TCP_RCV_LAST_FRAG (1UL << 0)
267#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268#define TCP_RCV_COPY_XID (1UL << 2)
269#define TCP_RCV_COPY_DATA (1UL << 3)
270#define TCP_RCV_READ_CALLDIR (1UL << 4)
271#define TCP_RCV_COPY_CALLDIR (1UL << 5)
272
273/*
274 * TCP RPC flags
275 */
276#define TCP_RPC_REPLY (1UL << 6)
277
278static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
279{
280 return (struct rpc_xprt *) sk->sk_user_data;
281}
282
283static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
284{
285 return (struct sockaddr *) &xprt->addr;
286}
287
288static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
289{
290 return (struct sockaddr_un *) &xprt->addr;
291}
292
293static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
294{
295 return (struct sockaddr_in *) &xprt->addr;
296}
297
298static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
299{
300 return (struct sockaddr_in6 *) &xprt->addr;
301}
302
303static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
304{
305 struct sockaddr *sap = xs_addr(xprt);
306 struct sockaddr_in6 *sin6;
307 struct sockaddr_in *sin;
308 struct sockaddr_un *sun;
309 char buf[128];
310
311 switch (sap->sa_family) {
312 case AF_LOCAL:
313 sun = xs_addr_un(xprt);
314 strlcpy(buf, sun->sun_path, sizeof(buf));
315 xprt->address_strings[RPC_DISPLAY_ADDR] =
316 kstrdup(buf, GFP_KERNEL);
317 break;
318 case AF_INET:
319 (void)rpc_ntop(sap, buf, sizeof(buf));
320 xprt->address_strings[RPC_DISPLAY_ADDR] =
321 kstrdup(buf, GFP_KERNEL);
322 sin = xs_addr_in(xprt);
323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
324 break;
325 case AF_INET6:
326 (void)rpc_ntop(sap, buf, sizeof(buf));
327 xprt->address_strings[RPC_DISPLAY_ADDR] =
328 kstrdup(buf, GFP_KERNEL);
329 sin6 = xs_addr_in6(xprt);
330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
331 break;
332 default:
333 BUG();
334 }
335
336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
337}
338
339static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
340{
341 struct sockaddr *sap = xs_addr(xprt);
342 char buf[128];
343
344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
346
347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
349}
350
351static void xs_format_peer_addresses(struct rpc_xprt *xprt,
352 const char *protocol,
353 const char *netid)
354{
355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
357 xs_format_common_peer_addresses(xprt);
358 xs_format_common_peer_ports(xprt);
359}
360
361static void xs_update_peer_port(struct rpc_xprt *xprt)
362{
363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
365
366 xs_format_common_peer_ports(xprt);
367}
368
369static void xs_free_peer_addresses(struct rpc_xprt *xprt)
370{
371 unsigned int i;
372
373 for (i = 0; i < RPC_DISPLAY_MAX; i++)
374 switch (i) {
375 case RPC_DISPLAY_PROTO:
376 case RPC_DISPLAY_NETID:
377 continue;
378 default:
379 kfree(xprt->address_strings[i]);
380 }
381}
382
383#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
384
385static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
386{
387 struct msghdr msg = {
388 .msg_name = addr,
389 .msg_namelen = addrlen,
390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
391 };
392 struct kvec iov = {
393 .iov_base = vec->iov_base + base,
394 .iov_len = vec->iov_len - base,
395 };
396
397 if (iov.iov_len != 0)
398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
399 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
400}
401
402static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
403{
404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
405 int offset, size_t size, int flags);
406 struct page **ppage;
407 unsigned int remainder;
408 int err, sent = 0;
409
410 remainder = xdr->page_len - base;
411 base += xdr->page_base;
412 ppage = xdr->pages + (base >> PAGE_SHIFT);
413 base &= ~PAGE_MASK;
414 do_sendpage = sock->ops->sendpage;
415 if (!zerocopy)
416 do_sendpage = sock_no_sendpage;
417 for(;;) {
418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
419 int flags = XS_SENDMSG_FLAGS;
420
421 remainder -= len;
422 if (remainder != 0 || more)
423 flags |= MSG_MORE;
424 err = do_sendpage(sock, *ppage, base, len, flags);
425 if (remainder == 0 || err != len)
426 break;
427 sent += err;
428 ppage++;
429 base = 0;
430 }
431 if (sent == 0)
432 return err;
433 if (err > 0)
434 sent += err;
435 return sent;
436}
437
438/**
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
445 * @zerocopy: true if it is safe to use sendpage()
446 *
447 */
448static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
449{
450 unsigned int remainder = xdr->len - base;
451 int err, sent = 0;
452
453 if (unlikely(!sock))
454 return -ENOTSOCK;
455
456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
457 if (base != 0) {
458 addr = NULL;
459 addrlen = 0;
460 }
461
462 if (base < xdr->head[0].iov_len || addr != NULL) {
463 unsigned int len = xdr->head[0].iov_len - base;
464 remainder -= len;
465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
466 if (remainder == 0 || err != len)
467 goto out;
468 sent += err;
469 base = 0;
470 } else
471 base -= xdr->head[0].iov_len;
472
473 if (base < xdr->page_len) {
474 unsigned int len = xdr->page_len - base;
475 remainder -= len;
476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
477 if (remainder == 0 || err != len)
478 goto out;
479 sent += err;
480 base = 0;
481 } else
482 base -= xdr->page_len;
483
484 if (base >= xdr->tail[0].iov_len)
485 return sent;
486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
487out:
488 if (sent == 0)
489 return err;
490 if (err > 0)
491 sent += err;
492 return sent;
493}
494
495static void xs_nospace_callback(struct rpc_task *task)
496{
497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
498
499 transport->inet->sk_write_pending--;
500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
501}
502
503/**
504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
506 *
507 */
508static int xs_nospace(struct rpc_task *task)
509{
510 struct rpc_rqst *req = task->tk_rqstp;
511 struct rpc_xprt *xprt = req->rq_xprt;
512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
513 struct sock *sk = transport->inet;
514 int ret = -EAGAIN;
515
516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
517 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
518 req->rq_slen);
519
520 /* Protect against races with write_space */
521 spin_lock_bh(&xprt->transport_lock);
522
523 /* Don't race with disconnect */
524 if (xprt_connected(xprt)) {
525 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
526 /*
527 * Notify TCP that we're limited by the application
528 * window size
529 */
530 set_bit(SOCK_NOSPACE, &transport->sock->flags);
531 sk->sk_write_pending++;
532 /* ...and wait for more buffer space */
533 xprt_wait_for_buffer_space(task, xs_nospace_callback);
534 }
535 } else {
536 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
537 ret = -ENOTCONN;
538 }
539
540 spin_unlock_bh(&xprt->transport_lock);
541
542 /* Race breaker in case memory is freed before above code is called */
543 sk->sk_write_space(sk);
544 return ret;
545}
546
547/*
548 * Construct a stream transport record marker in @buf.
549 */
550static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
551{
552 u32 reclen = buf->len - sizeof(rpc_fraghdr);
553 rpc_fraghdr *base = buf->head[0].iov_base;
554 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
555}
556
557/**
558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
559 * @task: 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 */
568static int xs_local_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 =
573 container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_encode_stream_record_marker(&req->rq_snd_buf);
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base, req->rq_svec->iov_len);
581
582 status = xs_sendpages(transport->sock, NULL, 0,
583 xdr, req->rq_bytes_sent, true);
584 dprintk("RPC: %s(%u) = %d\n",
585 __func__, xdr->len - req->rq_bytes_sent, status);
586 if (likely(status >= 0)) {
587 req->rq_bytes_sent += status;
588 req->rq_xmit_bytes_sent += status;
589 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
590 req->rq_bytes_sent = 0;
591 return 0;
592 }
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -ENOBUFS:
598 case -EAGAIN:
599 status = xs_nospace(task);
600 break;
601 default:
602 dprintk("RPC: sendmsg returned unrecognized error %d\n",
603 -status);
604 case -EPIPE:
605 xs_close(xprt);
606 status = -ENOTCONN;
607 }
608
609 return status;
610}
611
612/**
613 * xs_udp_send_request - write an RPC request to a UDP socket
614 * @task: address of RPC task that manages the state of an RPC request
615 *
616 * Return values:
617 * 0: The request has been sent
618 * EAGAIN: The socket was blocked, please call again later to
619 * complete the request
620 * ENOTCONN: Caller needs to invoke connect logic then call again
621 * other: Some other error occurred, the request was not sent
622 */
623static int xs_udp_send_request(struct rpc_task *task)
624{
625 struct rpc_rqst *req = task->tk_rqstp;
626 struct rpc_xprt *xprt = req->rq_xprt;
627 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
628 struct xdr_buf *xdr = &req->rq_snd_buf;
629 int status;
630
631 xs_pktdump("packet data:",
632 req->rq_svec->iov_base,
633 req->rq_svec->iov_len);
634
635 if (!xprt_bound(xprt))
636 return -ENOTCONN;
637 status = xs_sendpages(transport->sock,
638 xs_addr(xprt),
639 xprt->addrlen, xdr,
640 req->rq_bytes_sent, true);
641
642 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
643 xdr->len - req->rq_bytes_sent, status);
644
645 if (status >= 0) {
646 req->rq_xmit_bytes_sent += status;
647 if (status >= req->rq_slen)
648 return 0;
649 /* Still some bytes left; set up for a retry later. */
650 status = -EAGAIN;
651 }
652
653 switch (status) {
654 case -ENOTSOCK:
655 status = -ENOTCONN;
656 /* Should we call xs_close() here? */
657 break;
658 case -EAGAIN:
659 status = xs_nospace(task);
660 break;
661 default:
662 dprintk("RPC: sendmsg returned unrecognized error %d\n",
663 -status);
664 case -ENETUNREACH:
665 case -ENOBUFS:
666 case -EPIPE:
667 case -ECONNREFUSED:
668 /* When the server has died, an ICMP port unreachable message
669 * prompts ECONNREFUSED. */
670 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
671 }
672
673 return status;
674}
675
676/**
677 * xs_tcp_shutdown - gracefully shut down a TCP socket
678 * @xprt: transport
679 *
680 * Initiates a graceful shutdown of the TCP socket by calling the
681 * equivalent of shutdown(SHUT_WR);
682 */
683static void xs_tcp_shutdown(struct rpc_xprt *xprt)
684{
685 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
686 struct socket *sock = transport->sock;
687
688 if (sock != NULL) {
689 kernel_sock_shutdown(sock, SHUT_WR);
690 trace_rpc_socket_shutdown(xprt, sock);
691 }
692}
693
694/**
695 * xs_tcp_send_request - write an RPC request to a TCP socket
696 * @task: address of RPC task that manages the state of an RPC request
697 *
698 * Return values:
699 * 0: The request has been sent
700 * EAGAIN: The socket was blocked, please call again later to
701 * complete the request
702 * ENOTCONN: Caller needs to invoke connect logic then call again
703 * other: Some other error occurred, the request was not sent
704 *
705 * XXX: In the case of soft timeouts, should we eventually give up
706 * if sendmsg is not able to make progress?
707 */
708static int xs_tcp_send_request(struct rpc_task *task)
709{
710 struct rpc_rqst *req = task->tk_rqstp;
711 struct rpc_xprt *xprt = req->rq_xprt;
712 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
713 struct xdr_buf *xdr = &req->rq_snd_buf;
714 bool zerocopy = true;
715 int status;
716
717 xs_encode_stream_record_marker(&req->rq_snd_buf);
718
719 xs_pktdump("packet data:",
720 req->rq_svec->iov_base,
721 req->rq_svec->iov_len);
722 /* Don't use zero copy if this is a resend. If the RPC call
723 * completes while the socket holds a reference to the pages,
724 * then we may end up resending corrupted data.
725 */
726 if (task->tk_flags & RPC_TASK_SENT)
727 zerocopy = false;
728
729 /* Continue transmitting the packet/record. We must be careful
730 * to cope with writespace callbacks arriving _after_ we have
731 * called sendmsg(). */
732 while (1) {
733 status = xs_sendpages(transport->sock,
734 NULL, 0, xdr, req->rq_bytes_sent,
735 zerocopy);
736
737 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
738 xdr->len - req->rq_bytes_sent, status);
739
740 if (unlikely(status < 0))
741 break;
742
743 /* If we've sent the entire packet, immediately
744 * reset the count of bytes sent. */
745 req->rq_bytes_sent += status;
746 req->rq_xmit_bytes_sent += status;
747 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
748 req->rq_bytes_sent = 0;
749 return 0;
750 }
751
752 if (status != 0)
753 continue;
754 status = -EAGAIN;
755 break;
756 }
757
758 switch (status) {
759 case -ENOTSOCK:
760 status = -ENOTCONN;
761 /* Should we call xs_close() here? */
762 break;
763 case -ENOBUFS:
764 case -EAGAIN:
765 status = xs_nospace(task);
766 break;
767 default:
768 dprintk("RPC: sendmsg returned unrecognized error %d\n",
769 -status);
770 case -ECONNRESET:
771 xs_tcp_shutdown(xprt);
772 case -ECONNREFUSED:
773 case -ENOTCONN:
774 case -EPIPE:
775 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
776 }
777
778 return status;
779}
780
781/**
782 * xs_tcp_release_xprt - clean up after a tcp transmission
783 * @xprt: transport
784 * @task: rpc task
785 *
786 * This cleans up if an error causes us to abort the transmission of a request.
787 * In this case, the socket may need to be reset in order to avoid confusing
788 * the server.
789 */
790static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
791{
792 struct rpc_rqst *req;
793
794 if (task != xprt->snd_task)
795 return;
796 if (task == NULL)
797 goto out_release;
798 req = task->tk_rqstp;
799 if (req == NULL)
800 goto out_release;
801 if (req->rq_bytes_sent == 0)
802 goto out_release;
803 if (req->rq_bytes_sent == req->rq_snd_buf.len)
804 goto out_release;
805 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
806out_release:
807 xprt_release_xprt(xprt, task);
808}
809
810static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
811{
812 transport->old_data_ready = sk->sk_data_ready;
813 transport->old_state_change = sk->sk_state_change;
814 transport->old_write_space = sk->sk_write_space;
815 transport->old_error_report = sk->sk_error_report;
816}
817
818static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
819{
820 sk->sk_data_ready = transport->old_data_ready;
821 sk->sk_state_change = transport->old_state_change;
822 sk->sk_write_space = transport->old_write_space;
823 sk->sk_error_report = transport->old_error_report;
824}
825
826/**
827 * xs_error_report - callback to handle TCP socket state errors
828 * @sk: socket
829 *
830 * Note: we don't call sock_error() since there may be a rpc_task
831 * using the socket, and so we don't want to clear sk->sk_err.
832 */
833static void xs_error_report(struct sock *sk)
834{
835 struct rpc_xprt *xprt;
836 int err;
837
838 read_lock_bh(&sk->sk_callback_lock);
839 if (!(xprt = xprt_from_sock(sk)))
840 goto out;
841
842 err = -sk->sk_err;
843 if (err == 0)
844 goto out;
845 dprintk("RPC: xs_error_report client %p, error=%d...\n",
846 xprt, -err);
847 trace_rpc_socket_error(xprt, sk->sk_socket, err);
848 xprt_wake_pending_tasks(xprt, err);
849 out:
850 read_unlock_bh(&sk->sk_callback_lock);
851}
852
853static void xs_reset_transport(struct sock_xprt *transport)
854{
855 struct socket *sock = transport->sock;
856 struct sock *sk = transport->inet;
857
858 if (sk == NULL)
859 return;
860
861 transport->srcport = 0;
862
863 write_lock_bh(&sk->sk_callback_lock);
864 transport->inet = NULL;
865 transport->sock = NULL;
866
867 sk->sk_user_data = NULL;
868
869 xs_restore_old_callbacks(transport, sk);
870 write_unlock_bh(&sk->sk_callback_lock);
871
872 trace_rpc_socket_close(&transport->xprt, sock);
873 sock_release(sock);
874}
875
876/**
877 * xs_close - close a socket
878 * @xprt: transport
879 *
880 * This is used when all requests are complete; ie, no DRC state remains
881 * on the server we want to save.
882 *
883 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
884 * xs_reset_transport() zeroing the socket from underneath a writer.
885 */
886static void xs_close(struct rpc_xprt *xprt)
887{
888 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
889
890 dprintk("RPC: xs_close xprt %p\n", xprt);
891
892 cancel_delayed_work_sync(&transport->connect_worker);
893
894 xs_reset_transport(transport);
895 xprt->reestablish_timeout = 0;
896
897 smp_mb__before_atomic();
898 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
899 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
900 clear_bit(XPRT_CLOSING, &xprt->state);
901 smp_mb__after_atomic();
902 xprt_disconnect_done(xprt);
903}
904
905static void xs_tcp_close(struct rpc_xprt *xprt)
906{
907 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
908 xs_close(xprt);
909 else
910 xs_tcp_shutdown(xprt);
911}
912
913static void xs_xprt_free(struct rpc_xprt *xprt)
914{
915 xs_free_peer_addresses(xprt);
916 xprt_free(xprt);
917}
918
919/**
920 * xs_destroy - prepare to shutdown a transport
921 * @xprt: doomed transport
922 *
923 */
924static void xs_destroy(struct rpc_xprt *xprt)
925{
926 dprintk("RPC: xs_destroy xprt %p\n", xprt);
927
928 xs_close(xprt);
929 xs_xprt_free(xprt);
930 module_put(THIS_MODULE);
931}
932
933static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
934{
935 struct xdr_skb_reader desc = {
936 .skb = skb,
937 .offset = sizeof(rpc_fraghdr),
938 .count = skb->len - sizeof(rpc_fraghdr),
939 };
940
941 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
942 return -1;
943 if (desc.count)
944 return -1;
945 return 0;
946}
947
948/**
949 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
950 * @sk: socket with data to read
951 * @len: how much data to read
952 *
953 * Currently this assumes we can read the whole reply in a single gulp.
954 */
955static void xs_local_data_ready(struct sock *sk)
956{
957 struct rpc_task *task;
958 struct rpc_xprt *xprt;
959 struct rpc_rqst *rovr;
960 struct sk_buff *skb;
961 int err, repsize, copied;
962 u32 _xid;
963 __be32 *xp;
964
965 read_lock_bh(&sk->sk_callback_lock);
966 dprintk("RPC: %s...\n", __func__);
967 xprt = xprt_from_sock(sk);
968 if (xprt == NULL)
969 goto out;
970
971 skb = skb_recv_datagram(sk, 0, 1, &err);
972 if (skb == NULL)
973 goto out;
974
975 repsize = skb->len - sizeof(rpc_fraghdr);
976 if (repsize < 4) {
977 dprintk("RPC: impossible RPC reply size %d\n", repsize);
978 goto dropit;
979 }
980
981 /* Copy the XID from the skb... */
982 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
983 if (xp == NULL)
984 goto dropit;
985
986 /* Look up and lock the request corresponding to the given XID */
987 spin_lock(&xprt->transport_lock);
988 rovr = xprt_lookup_rqst(xprt, *xp);
989 if (!rovr)
990 goto out_unlock;
991 task = rovr->rq_task;
992
993 copied = rovr->rq_private_buf.buflen;
994 if (copied > repsize)
995 copied = repsize;
996
997 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
998 dprintk("RPC: sk_buff copy failed\n");
999 goto out_unlock;
1000 }
1001
1002 xprt_complete_rqst(task, copied);
1003
1004 out_unlock:
1005 spin_unlock(&xprt->transport_lock);
1006 dropit:
1007 skb_free_datagram(sk, skb);
1008 out:
1009 read_unlock_bh(&sk->sk_callback_lock);
1010}
1011
1012/**
1013 * xs_udp_data_ready - "data ready" callback for UDP sockets
1014 * @sk: socket with data to read
1015 * @len: how much data to read
1016 *
1017 */
1018static void xs_udp_data_ready(struct sock *sk)
1019{
1020 struct rpc_task *task;
1021 struct rpc_xprt *xprt;
1022 struct rpc_rqst *rovr;
1023 struct sk_buff *skb;
1024 int err, repsize, copied;
1025 u32 _xid;
1026 __be32 *xp;
1027
1028 read_lock_bh(&sk->sk_callback_lock);
1029 dprintk("RPC: xs_udp_data_ready...\n");
1030 if (!(xprt = xprt_from_sock(sk)))
1031 goto out;
1032
1033 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1034 goto out;
1035
1036 repsize = skb->len - sizeof(struct udphdr);
1037 if (repsize < 4) {
1038 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1039 goto dropit;
1040 }
1041
1042 /* Copy the XID from the skb... */
1043 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1044 sizeof(_xid), &_xid);
1045 if (xp == NULL)
1046 goto dropit;
1047
1048 /* Look up and lock the request corresponding to the given XID */
1049 spin_lock(&xprt->transport_lock);
1050 rovr = xprt_lookup_rqst(xprt, *xp);
1051 if (!rovr)
1052 goto out_unlock;
1053 task = rovr->rq_task;
1054
1055 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1056 copied = repsize;
1057
1058 /* Suck it into the iovec, verify checksum if not done by hw. */
1059 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1060 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1061 goto out_unlock;
1062 }
1063
1064 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1065
1066 xprt_adjust_cwnd(xprt, task, copied);
1067 xprt_complete_rqst(task, copied);
1068
1069 out_unlock:
1070 spin_unlock(&xprt->transport_lock);
1071 dropit:
1072 skb_free_datagram(sk, skb);
1073 out:
1074 read_unlock_bh(&sk->sk_callback_lock);
1075}
1076
1077/*
1078 * Helper function to force a TCP close if the server is sending
1079 * junk and/or it has put us in CLOSE_WAIT
1080 */
1081static void xs_tcp_force_close(struct rpc_xprt *xprt)
1082{
1083 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1084 xprt_force_disconnect(xprt);
1085}
1086
1087static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1088{
1089 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1090 size_t len, used;
1091 char *p;
1092
1093 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1094 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1095 used = xdr_skb_read_bits(desc, p, len);
1096 transport->tcp_offset += used;
1097 if (used != len)
1098 return;
1099
1100 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1101 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1102 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1103 else
1104 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1105 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1106
1107 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1108 transport->tcp_offset = 0;
1109
1110 /* Sanity check of the record length */
1111 if (unlikely(transport->tcp_reclen < 8)) {
1112 dprintk("RPC: invalid TCP record fragment length\n");
1113 xs_tcp_force_close(xprt);
1114 return;
1115 }
1116 dprintk("RPC: reading TCP record fragment of length %d\n",
1117 transport->tcp_reclen);
1118}
1119
1120static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1121{
1122 if (transport->tcp_offset == transport->tcp_reclen) {
1123 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1124 transport->tcp_offset = 0;
1125 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1126 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1127 transport->tcp_flags |= TCP_RCV_COPY_XID;
1128 transport->tcp_copied = 0;
1129 }
1130 }
1131}
1132
1133static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1134{
1135 size_t len, used;
1136 char *p;
1137
1138 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1139 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1140 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1141 used = xdr_skb_read_bits(desc, p, len);
1142 transport->tcp_offset += used;
1143 if (used != len)
1144 return;
1145 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1146 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1147 transport->tcp_copied = 4;
1148 dprintk("RPC: reading %s XID %08x\n",
1149 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1150 : "request with",
1151 ntohl(transport->tcp_xid));
1152 xs_tcp_check_fraghdr(transport);
1153}
1154
1155static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1156 struct xdr_skb_reader *desc)
1157{
1158 size_t len, used;
1159 u32 offset;
1160 char *p;
1161
1162 /*
1163 * We want transport->tcp_offset to be 8 at the end of this routine
1164 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1165 * When this function is called for the first time,
1166 * transport->tcp_offset is 4 (after having already read the xid).
1167 */
1168 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1169 len = sizeof(transport->tcp_calldir) - offset;
1170 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1171 p = ((char *) &transport->tcp_calldir) + offset;
1172 used = xdr_skb_read_bits(desc, p, len);
1173 transport->tcp_offset += used;
1174 if (used != len)
1175 return;
1176 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1177 /*
1178 * We don't yet have the XDR buffer, so we will write the calldir
1179 * out after we get the buffer from the 'struct rpc_rqst'
1180 */
1181 switch (ntohl(transport->tcp_calldir)) {
1182 case RPC_REPLY:
1183 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1184 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1185 transport->tcp_flags |= TCP_RPC_REPLY;
1186 break;
1187 case RPC_CALL:
1188 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1189 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1190 transport->tcp_flags &= ~TCP_RPC_REPLY;
1191 break;
1192 default:
1193 dprintk("RPC: invalid request message type\n");
1194 xs_tcp_force_close(&transport->xprt);
1195 }
1196 xs_tcp_check_fraghdr(transport);
1197}
1198
1199static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1200 struct xdr_skb_reader *desc,
1201 struct rpc_rqst *req)
1202{
1203 struct sock_xprt *transport =
1204 container_of(xprt, struct sock_xprt, xprt);
1205 struct xdr_buf *rcvbuf;
1206 size_t len;
1207 ssize_t r;
1208
1209 rcvbuf = &req->rq_private_buf;
1210
1211 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1212 /*
1213 * Save the RPC direction in the XDR buffer
1214 */
1215 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1216 &transport->tcp_calldir,
1217 sizeof(transport->tcp_calldir));
1218 transport->tcp_copied += sizeof(transport->tcp_calldir);
1219 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1220 }
1221
1222 len = desc->count;
1223 if (len > transport->tcp_reclen - transport->tcp_offset) {
1224 struct xdr_skb_reader my_desc;
1225
1226 len = transport->tcp_reclen - transport->tcp_offset;
1227 memcpy(&my_desc, desc, sizeof(my_desc));
1228 my_desc.count = len;
1229 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1230 &my_desc, xdr_skb_read_bits);
1231 desc->count -= r;
1232 desc->offset += r;
1233 } else
1234 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1235 desc, xdr_skb_read_bits);
1236
1237 if (r > 0) {
1238 transport->tcp_copied += r;
1239 transport->tcp_offset += r;
1240 }
1241 if (r != len) {
1242 /* Error when copying to the receive buffer,
1243 * usually because we weren't able to allocate
1244 * additional buffer pages. All we can do now
1245 * is turn off TCP_RCV_COPY_DATA, so the request
1246 * will not receive any additional updates,
1247 * and time out.
1248 * Any remaining data from this record will
1249 * be discarded.
1250 */
1251 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1252 dprintk("RPC: XID %08x truncated request\n",
1253 ntohl(transport->tcp_xid));
1254 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1255 "tcp_offset = %u, tcp_reclen = %u\n",
1256 xprt, transport->tcp_copied,
1257 transport->tcp_offset, transport->tcp_reclen);
1258 return;
1259 }
1260
1261 dprintk("RPC: XID %08x read %Zd bytes\n",
1262 ntohl(transport->tcp_xid), r);
1263 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1264 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1265 transport->tcp_offset, transport->tcp_reclen);
1266
1267 if (transport->tcp_copied == req->rq_private_buf.buflen)
1268 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1269 else if (transport->tcp_offset == transport->tcp_reclen) {
1270 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1271 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1272 }
1273}
1274
1275/*
1276 * Finds the request corresponding to the RPC xid and invokes the common
1277 * tcp read code to read the data.
1278 */
1279static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1280 struct xdr_skb_reader *desc)
1281{
1282 struct sock_xprt *transport =
1283 container_of(xprt, struct sock_xprt, xprt);
1284 struct rpc_rqst *req;
1285
1286 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1287
1288 /* Find and lock the request corresponding to this xid */
1289 spin_lock(&xprt->transport_lock);
1290 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1291 if (!req) {
1292 dprintk("RPC: XID %08x request not found!\n",
1293 ntohl(transport->tcp_xid));
1294 spin_unlock(&xprt->transport_lock);
1295 return -1;
1296 }
1297
1298 xs_tcp_read_common(xprt, desc, req);
1299
1300 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1301 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1302
1303 spin_unlock(&xprt->transport_lock);
1304 return 0;
1305}
1306
1307#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1308/*
1309 * Obtains an rpc_rqst previously allocated and invokes the common
1310 * tcp read code to read the data. The result is placed in the callback
1311 * queue.
1312 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1313 * connection and return -1.
1314 */
1315static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1316 struct xdr_skb_reader *desc)
1317{
1318 struct sock_xprt *transport =
1319 container_of(xprt, struct sock_xprt, xprt);
1320 struct rpc_rqst *req;
1321
1322 /* Look up and lock the request corresponding to the given XID */
1323 spin_lock(&xprt->transport_lock);
1324 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1325 if (req == NULL) {
1326 spin_unlock(&xprt->transport_lock);
1327 printk(KERN_WARNING "Callback slot table overflowed\n");
1328 xprt_force_disconnect(xprt);
1329 return -1;
1330 }
1331
1332 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1333 xs_tcp_read_common(xprt, desc, req);
1334
1335 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1336 xprt_complete_bc_request(req, transport->tcp_copied);
1337 spin_unlock(&xprt->transport_lock);
1338
1339 return 0;
1340}
1341
1342static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1343 struct xdr_skb_reader *desc)
1344{
1345 struct sock_xprt *transport =
1346 container_of(xprt, struct sock_xprt, xprt);
1347
1348 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1349 xs_tcp_read_reply(xprt, desc) :
1350 xs_tcp_read_callback(xprt, desc);
1351}
1352#else
1353static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1354 struct xdr_skb_reader *desc)
1355{
1356 return xs_tcp_read_reply(xprt, desc);
1357}
1358#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1359
1360/*
1361 * Read data off the transport. This can be either an RPC_CALL or an
1362 * RPC_REPLY. Relay the processing to helper functions.
1363 */
1364static void xs_tcp_read_data(struct rpc_xprt *xprt,
1365 struct xdr_skb_reader *desc)
1366{
1367 struct sock_xprt *transport =
1368 container_of(xprt, struct sock_xprt, xprt);
1369
1370 if (_xs_tcp_read_data(xprt, desc) == 0)
1371 xs_tcp_check_fraghdr(transport);
1372 else {
1373 /*
1374 * The transport_lock protects the request handling.
1375 * There's no need to hold it to update the tcp_flags.
1376 */
1377 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1378 }
1379}
1380
1381static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1382{
1383 size_t len;
1384
1385 len = transport->tcp_reclen - transport->tcp_offset;
1386 if (len > desc->count)
1387 len = desc->count;
1388 desc->count -= len;
1389 desc->offset += len;
1390 transport->tcp_offset += len;
1391 dprintk("RPC: discarded %Zu bytes\n", len);
1392 xs_tcp_check_fraghdr(transport);
1393}
1394
1395static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1396{
1397 struct rpc_xprt *xprt = rd_desc->arg.data;
1398 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1399 struct xdr_skb_reader desc = {
1400 .skb = skb,
1401 .offset = offset,
1402 .count = len,
1403 };
1404
1405 dprintk("RPC: xs_tcp_data_recv started\n");
1406 do {
1407 /* Read in a new fragment marker if necessary */
1408 /* Can we ever really expect to get completely empty fragments? */
1409 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1410 xs_tcp_read_fraghdr(xprt, &desc);
1411 continue;
1412 }
1413 /* Read in the xid if necessary */
1414 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1415 xs_tcp_read_xid(transport, &desc);
1416 continue;
1417 }
1418 /* Read in the call/reply flag */
1419 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1420 xs_tcp_read_calldir(transport, &desc);
1421 continue;
1422 }
1423 /* Read in the request data */
1424 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1425 xs_tcp_read_data(xprt, &desc);
1426 continue;
1427 }
1428 /* Skip over any trailing bytes on short reads */
1429 xs_tcp_read_discard(transport, &desc);
1430 } while (desc.count);
1431 dprintk("RPC: xs_tcp_data_recv done\n");
1432 return len - desc.count;
1433}
1434
1435/**
1436 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1437 * @sk: socket with data to read
1438 * @bytes: how much data to read
1439 *
1440 */
1441static void xs_tcp_data_ready(struct sock *sk)
1442{
1443 struct rpc_xprt *xprt;
1444 read_descriptor_t rd_desc;
1445 int read;
1446
1447 dprintk("RPC: xs_tcp_data_ready...\n");
1448
1449 read_lock_bh(&sk->sk_callback_lock);
1450 if (!(xprt = xprt_from_sock(sk)))
1451 goto out;
1452 /* Any data means we had a useful conversation, so
1453 * the we don't need to delay the next reconnect
1454 */
1455 if (xprt->reestablish_timeout)
1456 xprt->reestablish_timeout = 0;
1457
1458 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1459 rd_desc.arg.data = xprt;
1460 do {
1461 rd_desc.count = 65536;
1462 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1463 } while (read > 0);
1464out:
1465 read_unlock_bh(&sk->sk_callback_lock);
1466}
1467
1468/*
1469 * Do the equivalent of linger/linger2 handling for dealing with
1470 * broken servers that don't close the socket in a timely
1471 * fashion
1472 */
1473static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1474 unsigned long timeout)
1475{
1476 struct sock_xprt *transport;
1477
1478 if (xprt_test_and_set_connecting(xprt))
1479 return;
1480 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1481 transport = container_of(xprt, struct sock_xprt, xprt);
1482 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1483 timeout);
1484}
1485
1486static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1487{
1488 struct sock_xprt *transport;
1489
1490 transport = container_of(xprt, struct sock_xprt, xprt);
1491
1492 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1493 !cancel_delayed_work(&transport->connect_worker))
1494 return;
1495 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1496 xprt_clear_connecting(xprt);
1497}
1498
1499static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1500{
1501 smp_mb__before_atomic();
1502 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1503 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1504 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1505 clear_bit(XPRT_CLOSING, &xprt->state);
1506 smp_mb__after_atomic();
1507}
1508
1509static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1510{
1511 xs_sock_reset_connection_flags(xprt);
1512 /* Mark transport as closed and wake up all pending tasks */
1513 xprt_disconnect_done(xprt);
1514}
1515
1516/**
1517 * xs_tcp_state_change - callback to handle TCP socket state changes
1518 * @sk: socket whose state has changed
1519 *
1520 */
1521static void xs_tcp_state_change(struct sock *sk)
1522{
1523 struct rpc_xprt *xprt;
1524
1525 read_lock_bh(&sk->sk_callback_lock);
1526 if (!(xprt = xprt_from_sock(sk)))
1527 goto out;
1528 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1529 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1530 sk->sk_state, xprt_connected(xprt),
1531 sock_flag(sk, SOCK_DEAD),
1532 sock_flag(sk, SOCK_ZAPPED),
1533 sk->sk_shutdown);
1534
1535 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1536 switch (sk->sk_state) {
1537 case TCP_ESTABLISHED:
1538 spin_lock(&xprt->transport_lock);
1539 if (!xprt_test_and_set_connected(xprt)) {
1540 struct sock_xprt *transport = container_of(xprt,
1541 struct sock_xprt, xprt);
1542
1543 /* Reset TCP record info */
1544 transport->tcp_offset = 0;
1545 transport->tcp_reclen = 0;
1546 transport->tcp_copied = 0;
1547 transport->tcp_flags =
1548 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1549 xprt->connect_cookie++;
1550
1551 xprt_wake_pending_tasks(xprt, -EAGAIN);
1552 }
1553 spin_unlock(&xprt->transport_lock);
1554 break;
1555 case TCP_FIN_WAIT1:
1556 /* The client initiated a shutdown of the socket */
1557 xprt->connect_cookie++;
1558 xprt->reestablish_timeout = 0;
1559 set_bit(XPRT_CLOSING, &xprt->state);
1560 smp_mb__before_atomic();
1561 clear_bit(XPRT_CONNECTED, &xprt->state);
1562 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1563 smp_mb__after_atomic();
1564 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1565 break;
1566 case TCP_CLOSE_WAIT:
1567 /* The server initiated a shutdown of the socket */
1568 xprt->connect_cookie++;
1569 clear_bit(XPRT_CONNECTED, &xprt->state);
1570 xs_tcp_force_close(xprt);
1571 case TCP_CLOSING:
1572 /*
1573 * If the server closed down the connection, make sure that
1574 * we back off before reconnecting
1575 */
1576 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1577 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1578 break;
1579 case TCP_LAST_ACK:
1580 set_bit(XPRT_CLOSING, &xprt->state);
1581 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1582 smp_mb__before_atomic();
1583 clear_bit(XPRT_CONNECTED, &xprt->state);
1584 smp_mb__after_atomic();
1585 break;
1586 case TCP_CLOSE:
1587 xs_tcp_cancel_linger_timeout(xprt);
1588 xs_sock_mark_closed(xprt);
1589 }
1590 out:
1591 read_unlock_bh(&sk->sk_callback_lock);
1592}
1593
1594static void xs_write_space(struct sock *sk)
1595{
1596 struct socket *sock;
1597 struct rpc_xprt *xprt;
1598
1599 if (unlikely(!(sock = sk->sk_socket)))
1600 return;
1601 clear_bit(SOCK_NOSPACE, &sock->flags);
1602
1603 if (unlikely(!(xprt = xprt_from_sock(sk))))
1604 return;
1605 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1606 return;
1607
1608 xprt_write_space(xprt);
1609}
1610
1611/**
1612 * xs_udp_write_space - callback invoked when socket buffer space
1613 * becomes available
1614 * @sk: socket whose state has changed
1615 *
1616 * Called when more output buffer space is available for this socket.
1617 * We try not to wake our writers until they can make "significant"
1618 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1619 * with a bunch of small requests.
1620 */
1621static void xs_udp_write_space(struct sock *sk)
1622{
1623 read_lock_bh(&sk->sk_callback_lock);
1624
1625 /* from net/core/sock.c:sock_def_write_space */
1626 if (sock_writeable(sk))
1627 xs_write_space(sk);
1628
1629 read_unlock_bh(&sk->sk_callback_lock);
1630}
1631
1632/**
1633 * xs_tcp_write_space - callback invoked when socket buffer space
1634 * becomes available
1635 * @sk: socket whose state has changed
1636 *
1637 * Called when more output buffer space is available for this socket.
1638 * We try not to wake our writers until they can make "significant"
1639 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1640 * with a bunch of small requests.
1641 */
1642static void xs_tcp_write_space(struct sock *sk)
1643{
1644 read_lock_bh(&sk->sk_callback_lock);
1645
1646 /* from net/core/stream.c:sk_stream_write_space */
1647 if (sk_stream_is_writeable(sk))
1648 xs_write_space(sk);
1649
1650 read_unlock_bh(&sk->sk_callback_lock);
1651}
1652
1653static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1654{
1655 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1656 struct sock *sk = transport->inet;
1657
1658 if (transport->rcvsize) {
1659 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1660 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1661 }
1662 if (transport->sndsize) {
1663 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1664 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1665 sk->sk_write_space(sk);
1666 }
1667}
1668
1669/**
1670 * xs_udp_set_buffer_size - set send and receive limits
1671 * @xprt: generic transport
1672 * @sndsize: requested size of send buffer, in bytes
1673 * @rcvsize: requested size of receive buffer, in bytes
1674 *
1675 * Set socket send and receive buffer size limits.
1676 */
1677static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1678{
1679 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1680
1681 transport->sndsize = 0;
1682 if (sndsize)
1683 transport->sndsize = sndsize + 1024;
1684 transport->rcvsize = 0;
1685 if (rcvsize)
1686 transport->rcvsize = rcvsize + 1024;
1687
1688 xs_udp_do_set_buffer_size(xprt);
1689}
1690
1691/**
1692 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1693 * @task: task that timed out
1694 *
1695 * Adjust the congestion window after a retransmit timeout has occurred.
1696 */
1697static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1698{
1699 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1700}
1701
1702static unsigned short xs_get_random_port(void)
1703{
1704 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1705 unsigned short rand = (unsigned short) prandom_u32() % range;
1706 return rand + xprt_min_resvport;
1707}
1708
1709/**
1710 * xs_set_port - reset the port number in the remote endpoint address
1711 * @xprt: generic transport
1712 * @port: new port number
1713 *
1714 */
1715static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1716{
1717 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1718
1719 rpc_set_port(xs_addr(xprt), port);
1720 xs_update_peer_port(xprt);
1721}
1722
1723static unsigned short xs_get_srcport(struct sock_xprt *transport)
1724{
1725 unsigned short port = transport->srcport;
1726
1727 if (port == 0 && transport->xprt.resvport)
1728 port = xs_get_random_port();
1729 return port;
1730}
1731
1732static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1733{
1734 if (transport->srcport != 0)
1735 transport->srcport = 0;
1736 if (!transport->xprt.resvport)
1737 return 0;
1738 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1739 return xprt_max_resvport;
1740 return --port;
1741}
1742static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1743{
1744 struct sockaddr_storage myaddr;
1745 int err, nloop = 0;
1746 unsigned short port = xs_get_srcport(transport);
1747 unsigned short last;
1748
1749 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1750 do {
1751 rpc_set_port((struct sockaddr *)&myaddr, port);
1752 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1753 transport->xprt.addrlen);
1754 if (port == 0)
1755 break;
1756 if (err == 0) {
1757 transport->srcport = port;
1758 break;
1759 }
1760 last = port;
1761 port = xs_next_srcport(transport, port);
1762 if (port > last)
1763 nloop++;
1764 } while (err == -EADDRINUSE && nloop != 2);
1765
1766 if (myaddr.ss_family == AF_INET)
1767 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1768 &((struct sockaddr_in *)&myaddr)->sin_addr,
1769 port, err ? "failed" : "ok", err);
1770 else
1771 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1772 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1773 port, err ? "failed" : "ok", err);
1774 return err;
1775}
1776
1777/*
1778 * We don't support autobind on AF_LOCAL sockets
1779 */
1780static void xs_local_rpcbind(struct rpc_task *task)
1781{
1782 rcu_read_lock();
1783 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1784 rcu_read_unlock();
1785}
1786
1787static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1788{
1789}
1790
1791#ifdef CONFIG_DEBUG_LOCK_ALLOC
1792static struct lock_class_key xs_key[2];
1793static struct lock_class_key xs_slock_key[2];
1794
1795static inline void xs_reclassify_socketu(struct socket *sock)
1796{
1797 struct sock *sk = sock->sk;
1798
1799 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1800 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1801}
1802
1803static inline void xs_reclassify_socket4(struct socket *sock)
1804{
1805 struct sock *sk = sock->sk;
1806
1807 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1808 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1809}
1810
1811static inline void xs_reclassify_socket6(struct socket *sock)
1812{
1813 struct sock *sk = sock->sk;
1814
1815 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1816 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1817}
1818
1819static inline void xs_reclassify_socket(int family, struct socket *sock)
1820{
1821 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1822 if (sock_owned_by_user(sock->sk))
1823 return;
1824
1825 switch (family) {
1826 case AF_LOCAL:
1827 xs_reclassify_socketu(sock);
1828 break;
1829 case AF_INET:
1830 xs_reclassify_socket4(sock);
1831 break;
1832 case AF_INET6:
1833 xs_reclassify_socket6(sock);
1834 break;
1835 }
1836}
1837#else
1838static inline void xs_reclassify_socketu(struct socket *sock)
1839{
1840}
1841
1842static inline void xs_reclassify_socket4(struct socket *sock)
1843{
1844}
1845
1846static inline void xs_reclassify_socket6(struct socket *sock)
1847{
1848}
1849
1850static inline void xs_reclassify_socket(int family, struct socket *sock)
1851{
1852}
1853#endif
1854
1855static void xs_dummy_setup_socket(struct work_struct *work)
1856{
1857}
1858
1859static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1860 struct sock_xprt *transport, int family, int type, int protocol)
1861{
1862 struct socket *sock;
1863 int err;
1864
1865 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1866 if (err < 0) {
1867 dprintk("RPC: can't create %d transport socket (%d).\n",
1868 protocol, -err);
1869 goto out;
1870 }
1871 xs_reclassify_socket(family, sock);
1872
1873 err = xs_bind(transport, sock);
1874 if (err) {
1875 sock_release(sock);
1876 goto out;
1877 }
1878
1879 return sock;
1880out:
1881 return ERR_PTR(err);
1882}
1883
1884static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1885 struct socket *sock)
1886{
1887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1888 xprt);
1889
1890 if (!transport->inet) {
1891 struct sock *sk = sock->sk;
1892
1893 write_lock_bh(&sk->sk_callback_lock);
1894
1895 xs_save_old_callbacks(transport, sk);
1896
1897 sk->sk_user_data = xprt;
1898 sk->sk_data_ready = xs_local_data_ready;
1899 sk->sk_write_space = xs_udp_write_space;
1900 sk->sk_error_report = xs_error_report;
1901 sk->sk_allocation = GFP_ATOMIC;
1902
1903 xprt_clear_connected(xprt);
1904
1905 /* Reset to new socket */
1906 transport->sock = sock;
1907 transport->inet = sk;
1908
1909 write_unlock_bh(&sk->sk_callback_lock);
1910 }
1911
1912 /* Tell the socket layer to start connecting... */
1913 xprt->stat.connect_count++;
1914 xprt->stat.connect_start = jiffies;
1915 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1916}
1917
1918/**
1919 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1920 * @xprt: RPC transport to connect
1921 * @transport: socket transport to connect
1922 * @create_sock: function to create a socket of the correct type
1923 */
1924static int xs_local_setup_socket(struct sock_xprt *transport)
1925{
1926 struct rpc_xprt *xprt = &transport->xprt;
1927 struct socket *sock;
1928 int status = -EIO;
1929
1930 current->flags |= PF_FSTRANS;
1931
1932 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1933 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1934 SOCK_STREAM, 0, &sock, 1);
1935 if (status < 0) {
1936 dprintk("RPC: can't create AF_LOCAL "
1937 "transport socket (%d).\n", -status);
1938 goto out;
1939 }
1940 xs_reclassify_socketu(sock);
1941
1942 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1943 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1944
1945 status = xs_local_finish_connecting(xprt, sock);
1946 trace_rpc_socket_connect(xprt, sock, status);
1947 switch (status) {
1948 case 0:
1949 dprintk("RPC: xprt %p connected to %s\n",
1950 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1951 xprt_set_connected(xprt);
1952 case -ENOBUFS:
1953 break;
1954 case -ENOENT:
1955 dprintk("RPC: xprt %p: socket %s does not exist\n",
1956 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1957 break;
1958 case -ECONNREFUSED:
1959 dprintk("RPC: xprt %p: connection refused for %s\n",
1960 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1961 break;
1962 default:
1963 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1964 __func__, -status,
1965 xprt->address_strings[RPC_DISPLAY_ADDR]);
1966 }
1967
1968out:
1969 xprt_clear_connecting(xprt);
1970 xprt_wake_pending_tasks(xprt, status);
1971 current->flags &= ~PF_FSTRANS;
1972 return status;
1973}
1974
1975static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1976{
1977 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1978 int ret;
1979
1980 if (RPC_IS_ASYNC(task)) {
1981 /*
1982 * We want the AF_LOCAL connect to be resolved in the
1983 * filesystem namespace of the process making the rpc
1984 * call. Thus we connect synchronously.
1985 *
1986 * If we want to support asynchronous AF_LOCAL calls,
1987 * we'll need to figure out how to pass a namespace to
1988 * connect.
1989 */
1990 rpc_exit(task, -ENOTCONN);
1991 return;
1992 }
1993 ret = xs_local_setup_socket(transport);
1994 if (ret && !RPC_IS_SOFTCONN(task))
1995 msleep_interruptible(15000);
1996}
1997
1998#ifdef CONFIG_SUNRPC_SWAP
1999static void xs_set_memalloc(struct rpc_xprt *xprt)
2000{
2001 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2002 xprt);
2003
2004 if (xprt->swapper)
2005 sk_set_memalloc(transport->inet);
2006}
2007
2008/**
2009 * xs_swapper - Tag this transport as being used for swap.
2010 * @xprt: transport to tag
2011 * @enable: enable/disable
2012 *
2013 */
2014int xs_swapper(struct rpc_xprt *xprt, int enable)
2015{
2016 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2017 xprt);
2018 int err = 0;
2019
2020 if (enable) {
2021 xprt->swapper++;
2022 xs_set_memalloc(xprt);
2023 } else if (xprt->swapper) {
2024 xprt->swapper--;
2025 sk_clear_memalloc(transport->inet);
2026 }
2027
2028 return err;
2029}
2030EXPORT_SYMBOL_GPL(xs_swapper);
2031#else
2032static void xs_set_memalloc(struct rpc_xprt *xprt)
2033{
2034}
2035#endif
2036
2037static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2038{
2039 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2040
2041 if (!transport->inet) {
2042 struct sock *sk = sock->sk;
2043
2044 write_lock_bh(&sk->sk_callback_lock);
2045
2046 xs_save_old_callbacks(transport, sk);
2047
2048 sk->sk_user_data = xprt;
2049 sk->sk_data_ready = xs_udp_data_ready;
2050 sk->sk_write_space = xs_udp_write_space;
2051 sk->sk_allocation = GFP_ATOMIC;
2052
2053 xprt_set_connected(xprt);
2054
2055 /* Reset to new socket */
2056 transport->sock = sock;
2057 transport->inet = sk;
2058
2059 xs_set_memalloc(xprt);
2060
2061 write_unlock_bh(&sk->sk_callback_lock);
2062 }
2063 xs_udp_do_set_buffer_size(xprt);
2064}
2065
2066static void xs_udp_setup_socket(struct work_struct *work)
2067{
2068 struct sock_xprt *transport =
2069 container_of(work, struct sock_xprt, connect_worker.work);
2070 struct rpc_xprt *xprt = &transport->xprt;
2071 struct socket *sock = transport->sock;
2072 int status = -EIO;
2073
2074 current->flags |= PF_FSTRANS;
2075
2076 /* Start by resetting any existing state */
2077 xs_reset_transport(transport);
2078 sock = xs_create_sock(xprt, transport,
2079 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2080 if (IS_ERR(sock))
2081 goto out;
2082
2083 dprintk("RPC: worker connecting xprt %p via %s to "
2084 "%s (port %s)\n", xprt,
2085 xprt->address_strings[RPC_DISPLAY_PROTO],
2086 xprt->address_strings[RPC_DISPLAY_ADDR],
2087 xprt->address_strings[RPC_DISPLAY_PORT]);
2088
2089 xs_udp_finish_connecting(xprt, sock);
2090 trace_rpc_socket_connect(xprt, sock, 0);
2091 status = 0;
2092out:
2093 xprt_clear_connecting(xprt);
2094 xprt_wake_pending_tasks(xprt, status);
2095 current->flags &= ~PF_FSTRANS;
2096}
2097
2098/*
2099 * We need to preserve the port number so the reply cache on the server can
2100 * find our cached RPC replies when we get around to reconnecting.
2101 */
2102static void xs_abort_connection(struct sock_xprt *transport)
2103{
2104 int result;
2105 struct sockaddr any;
2106
2107 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2108
2109 /*
2110 * Disconnect the transport socket by doing a connect operation
2111 * with AF_UNSPEC. This should return immediately...
2112 */
2113 memset(&any, 0, sizeof(any));
2114 any.sa_family = AF_UNSPEC;
2115 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2116 trace_rpc_socket_reset_connection(&transport->xprt,
2117 transport->sock, result);
2118 if (!result)
2119 xs_sock_reset_connection_flags(&transport->xprt);
2120 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
2121}
2122
2123static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2124{
2125 unsigned int state = transport->inet->sk_state;
2126
2127 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2128 /* we don't need to abort the connection if the socket
2129 * hasn't undergone a shutdown
2130 */
2131 if (transport->inet->sk_shutdown == 0)
2132 return;
2133 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2134 __func__, transport->inet->sk_shutdown);
2135 }
2136 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2137 /* we don't need to abort the connection if the socket
2138 * hasn't undergone a shutdown
2139 */
2140 if (transport->inet->sk_shutdown == 0)
2141 return;
2142 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2143 "sk_shutdown set to %d\n",
2144 __func__, transport->inet->sk_shutdown);
2145 }
2146 xs_abort_connection(transport);
2147}
2148
2149static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2150{
2151 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2152 int ret = -ENOTCONN;
2153
2154 if (!transport->inet) {
2155 struct sock *sk = sock->sk;
2156 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2157 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2158 unsigned int opt_on = 1;
2159
2160 /* TCP Keepalive options */
2161 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2162 (char *)&opt_on, sizeof(opt_on));
2163 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2164 (char *)&keepidle, sizeof(keepidle));
2165 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2166 (char *)&keepidle, sizeof(keepidle));
2167 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2168 (char *)&keepcnt, sizeof(keepcnt));
2169
2170 write_lock_bh(&sk->sk_callback_lock);
2171
2172 xs_save_old_callbacks(transport, sk);
2173
2174 sk->sk_user_data = xprt;
2175 sk->sk_data_ready = xs_tcp_data_ready;
2176 sk->sk_state_change = xs_tcp_state_change;
2177 sk->sk_write_space = xs_tcp_write_space;
2178 sk->sk_error_report = xs_error_report;
2179 sk->sk_allocation = GFP_ATOMIC;
2180
2181 /* socket options */
2182 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2183 sock_reset_flag(sk, SOCK_LINGER);
2184 tcp_sk(sk)->linger2 = 0;
2185 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2186
2187 xprt_clear_connected(xprt);
2188
2189 /* Reset to new socket */
2190 transport->sock = sock;
2191 transport->inet = sk;
2192
2193 write_unlock_bh(&sk->sk_callback_lock);
2194 }
2195
2196 if (!xprt_bound(xprt))
2197 goto out;
2198
2199 xs_set_memalloc(xprt);
2200
2201 /* Tell the socket layer to start connecting... */
2202 xprt->stat.connect_count++;
2203 xprt->stat.connect_start = jiffies;
2204 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2205 switch (ret) {
2206 case 0:
2207 case -EINPROGRESS:
2208 /* SYN_SENT! */
2209 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2210 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2211 }
2212out:
2213 return ret;
2214}
2215
2216/**
2217 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2218 * @xprt: RPC transport to connect
2219 * @transport: socket transport to connect
2220 * @create_sock: function to create a socket of the correct type
2221 *
2222 * Invoked by a work queue tasklet.
2223 */
2224static void xs_tcp_setup_socket(struct work_struct *work)
2225{
2226 struct sock_xprt *transport =
2227 container_of(work, struct sock_xprt, connect_worker.work);
2228 struct socket *sock = transport->sock;
2229 struct rpc_xprt *xprt = &transport->xprt;
2230 int status = -EIO;
2231
2232 current->flags |= PF_FSTRANS;
2233
2234 if (!sock) {
2235 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2236 sock = xs_create_sock(xprt, transport,
2237 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2238 if (IS_ERR(sock)) {
2239 status = PTR_ERR(sock);
2240 goto out;
2241 }
2242 } else {
2243 int abort_and_exit;
2244
2245 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2246 &xprt->state);
2247 /* "close" the socket, preserving the local port */
2248 xs_tcp_reuse_connection(transport);
2249
2250 if (abort_and_exit)
2251 goto out_eagain;
2252 }
2253
2254 dprintk("RPC: worker connecting xprt %p via %s to "
2255 "%s (port %s)\n", xprt,
2256 xprt->address_strings[RPC_DISPLAY_PROTO],
2257 xprt->address_strings[RPC_DISPLAY_ADDR],
2258 xprt->address_strings[RPC_DISPLAY_PORT]);
2259
2260 status = xs_tcp_finish_connecting(xprt, sock);
2261 trace_rpc_socket_connect(xprt, sock, status);
2262 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2263 xprt, -status, xprt_connected(xprt),
2264 sock->sk->sk_state);
2265 switch (status) {
2266 default:
2267 printk("%s: connect returned unhandled error %d\n",
2268 __func__, status);
2269 case -EADDRNOTAVAIL:
2270 /* We're probably in TIME_WAIT. Get rid of existing socket,
2271 * and retry
2272 */
2273 xs_tcp_force_close(xprt);
2274 break;
2275 case 0:
2276 case -EINPROGRESS:
2277 case -EALREADY:
2278 xprt_clear_connecting(xprt);
2279 current->flags &= ~PF_FSTRANS;
2280 return;
2281 case -EINVAL:
2282 /* Happens, for instance, if the user specified a link
2283 * local IPv6 address without a scope-id.
2284 */
2285 case -ECONNREFUSED:
2286 case -ECONNRESET:
2287 case -ENETUNREACH:
2288 case -ENOBUFS:
2289 /* retry with existing socket, after a delay */
2290 goto out;
2291 }
2292out_eagain:
2293 status = -EAGAIN;
2294out:
2295 xprt_clear_connecting(xprt);
2296 xprt_wake_pending_tasks(xprt, status);
2297 current->flags &= ~PF_FSTRANS;
2298}
2299
2300/**
2301 * xs_connect - connect a socket to a remote endpoint
2302 * @xprt: pointer to transport structure
2303 * @task: address of RPC task that manages state of connect request
2304 *
2305 * TCP: If the remote end dropped the connection, delay reconnecting.
2306 *
2307 * UDP socket connects are synchronous, but we use a work queue anyway
2308 * to guarantee that even unprivileged user processes can set up a
2309 * socket on a privileged port.
2310 *
2311 * If a UDP socket connect fails, the delay behavior here prevents
2312 * retry floods (hard mounts).
2313 */
2314static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2315{
2316 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2317
2318 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2319 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2320 "seconds\n",
2321 xprt, xprt->reestablish_timeout / HZ);
2322 queue_delayed_work(rpciod_workqueue,
2323 &transport->connect_worker,
2324 xprt->reestablish_timeout);
2325 xprt->reestablish_timeout <<= 1;
2326 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2327 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2328 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2329 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2330 } else {
2331 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2332 queue_delayed_work(rpciod_workqueue,
2333 &transport->connect_worker, 0);
2334 }
2335}
2336
2337/**
2338 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2339 * @xprt: rpc_xprt struct containing statistics
2340 * @seq: output file
2341 *
2342 */
2343static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2344{
2345 long idle_time = 0;
2346
2347 if (xprt_connected(xprt))
2348 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2349
2350 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2351 "%llu %llu %lu %llu %llu\n",
2352 xprt->stat.bind_count,
2353 xprt->stat.connect_count,
2354 xprt->stat.connect_time,
2355 idle_time,
2356 xprt->stat.sends,
2357 xprt->stat.recvs,
2358 xprt->stat.bad_xids,
2359 xprt->stat.req_u,
2360 xprt->stat.bklog_u,
2361 xprt->stat.max_slots,
2362 xprt->stat.sending_u,
2363 xprt->stat.pending_u);
2364}
2365
2366/**
2367 * xs_udp_print_stats - display UDP socket-specifc stats
2368 * @xprt: rpc_xprt struct containing statistics
2369 * @seq: output file
2370 *
2371 */
2372static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2373{
2374 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2375
2376 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2377 "%lu %llu %llu\n",
2378 transport->srcport,
2379 xprt->stat.bind_count,
2380 xprt->stat.sends,
2381 xprt->stat.recvs,
2382 xprt->stat.bad_xids,
2383 xprt->stat.req_u,
2384 xprt->stat.bklog_u,
2385 xprt->stat.max_slots,
2386 xprt->stat.sending_u,
2387 xprt->stat.pending_u);
2388}
2389
2390/**
2391 * xs_tcp_print_stats - display TCP socket-specifc stats
2392 * @xprt: rpc_xprt struct containing statistics
2393 * @seq: output file
2394 *
2395 */
2396static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2397{
2398 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2399 long idle_time = 0;
2400
2401 if (xprt_connected(xprt))
2402 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2403
2404 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2405 "%llu %llu %lu %llu %llu\n",
2406 transport->srcport,
2407 xprt->stat.bind_count,
2408 xprt->stat.connect_count,
2409 xprt->stat.connect_time,
2410 idle_time,
2411 xprt->stat.sends,
2412 xprt->stat.recvs,
2413 xprt->stat.bad_xids,
2414 xprt->stat.req_u,
2415 xprt->stat.bklog_u,
2416 xprt->stat.max_slots,
2417 xprt->stat.sending_u,
2418 xprt->stat.pending_u);
2419}
2420
2421/*
2422 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2423 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2424 * to use the server side send routines.
2425 */
2426static void *bc_malloc(struct rpc_task *task, size_t size)
2427{
2428 struct page *page;
2429 struct rpc_buffer *buf;
2430
2431 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2432 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2433 return NULL;
2434
2435 page = alloc_page(GFP_KERNEL);
2436 if (!page)
2437 return NULL;
2438
2439 buf = page_address(page);
2440 buf->len = PAGE_SIZE;
2441
2442 return buf->data;
2443}
2444
2445/*
2446 * Free the space allocated in the bc_alloc routine
2447 */
2448static void bc_free(void *buffer)
2449{
2450 struct rpc_buffer *buf;
2451
2452 if (!buffer)
2453 return;
2454
2455 buf = container_of(buffer, struct rpc_buffer, data);
2456 free_page((unsigned long)buf);
2457}
2458
2459/*
2460 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2461 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2462 */
2463static int bc_sendto(struct rpc_rqst *req)
2464{
2465 int len;
2466 struct xdr_buf *xbufp = &req->rq_snd_buf;
2467 struct rpc_xprt *xprt = req->rq_xprt;
2468 struct sock_xprt *transport =
2469 container_of(xprt, struct sock_xprt, xprt);
2470 struct socket *sock = transport->sock;
2471 unsigned long headoff;
2472 unsigned long tailoff;
2473
2474 xs_encode_stream_record_marker(xbufp);
2475
2476 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2477 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2478 len = svc_send_common(sock, xbufp,
2479 virt_to_page(xbufp->head[0].iov_base), headoff,
2480 xbufp->tail[0].iov_base, tailoff);
2481
2482 if (len != xbufp->len) {
2483 printk(KERN_NOTICE "Error sending entire callback!\n");
2484 len = -EAGAIN;
2485 }
2486
2487 return len;
2488}
2489
2490/*
2491 * The send routine. Borrows from svc_send
2492 */
2493static int bc_send_request(struct rpc_task *task)
2494{
2495 struct rpc_rqst *req = task->tk_rqstp;
2496 struct svc_xprt *xprt;
2497 u32 len;
2498
2499 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2500 /*
2501 * Get the server socket associated with this callback xprt
2502 */
2503 xprt = req->rq_xprt->bc_xprt;
2504
2505 /*
2506 * Grab the mutex to serialize data as the connection is shared
2507 * with the fore channel
2508 */
2509 if (!mutex_trylock(&xprt->xpt_mutex)) {
2510 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2511 if (!mutex_trylock(&xprt->xpt_mutex))
2512 return -EAGAIN;
2513 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2514 }
2515 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2516 len = -ENOTCONN;
2517 else
2518 len = bc_sendto(req);
2519 mutex_unlock(&xprt->xpt_mutex);
2520
2521 if (len > 0)
2522 len = 0;
2523
2524 return len;
2525}
2526
2527/*
2528 * The close routine. Since this is client initiated, we do nothing
2529 */
2530
2531static void bc_close(struct rpc_xprt *xprt)
2532{
2533}
2534
2535/*
2536 * The xprt destroy routine. Again, because this connection is client
2537 * initiated, we do nothing
2538 */
2539
2540static void bc_destroy(struct rpc_xprt *xprt)
2541{
2542 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2543
2544 xs_xprt_free(xprt);
2545 module_put(THIS_MODULE);
2546}
2547
2548static struct rpc_xprt_ops xs_local_ops = {
2549 .reserve_xprt = xprt_reserve_xprt,
2550 .release_xprt = xs_tcp_release_xprt,
2551 .alloc_slot = xprt_alloc_slot,
2552 .rpcbind = xs_local_rpcbind,
2553 .set_port = xs_local_set_port,
2554 .connect = xs_local_connect,
2555 .buf_alloc = rpc_malloc,
2556 .buf_free = rpc_free,
2557 .send_request = xs_local_send_request,
2558 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2559 .close = xs_close,
2560 .destroy = xs_destroy,
2561 .print_stats = xs_local_print_stats,
2562};
2563
2564static struct rpc_xprt_ops xs_udp_ops = {
2565 .set_buffer_size = xs_udp_set_buffer_size,
2566 .reserve_xprt = xprt_reserve_xprt_cong,
2567 .release_xprt = xprt_release_xprt_cong,
2568 .alloc_slot = xprt_alloc_slot,
2569 .rpcbind = rpcb_getport_async,
2570 .set_port = xs_set_port,
2571 .connect = xs_connect,
2572 .buf_alloc = rpc_malloc,
2573 .buf_free = rpc_free,
2574 .send_request = xs_udp_send_request,
2575 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2576 .timer = xs_udp_timer,
2577 .release_request = xprt_release_rqst_cong,
2578 .close = xs_close,
2579 .destroy = xs_destroy,
2580 .print_stats = xs_udp_print_stats,
2581};
2582
2583static struct rpc_xprt_ops xs_tcp_ops = {
2584 .reserve_xprt = xprt_reserve_xprt,
2585 .release_xprt = xs_tcp_release_xprt,
2586 .alloc_slot = xprt_lock_and_alloc_slot,
2587 .rpcbind = rpcb_getport_async,
2588 .set_port = xs_set_port,
2589 .connect = xs_connect,
2590 .buf_alloc = rpc_malloc,
2591 .buf_free = rpc_free,
2592 .send_request = xs_tcp_send_request,
2593 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2594 .close = xs_tcp_close,
2595 .destroy = xs_destroy,
2596 .print_stats = xs_tcp_print_stats,
2597};
2598
2599/*
2600 * The rpc_xprt_ops for the server backchannel
2601 */
2602
2603static struct rpc_xprt_ops bc_tcp_ops = {
2604 .reserve_xprt = xprt_reserve_xprt,
2605 .release_xprt = xprt_release_xprt,
2606 .alloc_slot = xprt_alloc_slot,
2607 .buf_alloc = bc_malloc,
2608 .buf_free = bc_free,
2609 .send_request = bc_send_request,
2610 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2611 .close = bc_close,
2612 .destroy = bc_destroy,
2613 .print_stats = xs_tcp_print_stats,
2614};
2615
2616static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2617{
2618 static const struct sockaddr_in sin = {
2619 .sin_family = AF_INET,
2620 .sin_addr.s_addr = htonl(INADDR_ANY),
2621 };
2622 static const struct sockaddr_in6 sin6 = {
2623 .sin6_family = AF_INET6,
2624 .sin6_addr = IN6ADDR_ANY_INIT,
2625 };
2626
2627 switch (family) {
2628 case AF_LOCAL:
2629 break;
2630 case AF_INET:
2631 memcpy(sap, &sin, sizeof(sin));
2632 break;
2633 case AF_INET6:
2634 memcpy(sap, &sin6, sizeof(sin6));
2635 break;
2636 default:
2637 dprintk("RPC: %s: Bad address family\n", __func__);
2638 return -EAFNOSUPPORT;
2639 }
2640 return 0;
2641}
2642
2643static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2644 unsigned int slot_table_size,
2645 unsigned int max_slot_table_size)
2646{
2647 struct rpc_xprt *xprt;
2648 struct sock_xprt *new;
2649
2650 if (args->addrlen > sizeof(xprt->addr)) {
2651 dprintk("RPC: xs_setup_xprt: address too large\n");
2652 return ERR_PTR(-EBADF);
2653 }
2654
2655 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2656 max_slot_table_size);
2657 if (xprt == NULL) {
2658 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2659 "rpc_xprt\n");
2660 return ERR_PTR(-ENOMEM);
2661 }
2662
2663 new = container_of(xprt, struct sock_xprt, xprt);
2664 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2665 xprt->addrlen = args->addrlen;
2666 if (args->srcaddr)
2667 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2668 else {
2669 int err;
2670 err = xs_init_anyaddr(args->dstaddr->sa_family,
2671 (struct sockaddr *)&new->srcaddr);
2672 if (err != 0) {
2673 xprt_free(xprt);
2674 return ERR_PTR(err);
2675 }
2676 }
2677
2678 return xprt;
2679}
2680
2681static const struct rpc_timeout xs_local_default_timeout = {
2682 .to_initval = 10 * HZ,
2683 .to_maxval = 10 * HZ,
2684 .to_retries = 2,
2685};
2686
2687/**
2688 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2689 * @args: rpc transport creation arguments
2690 *
2691 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2692 */
2693static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2694{
2695 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2696 struct sock_xprt *transport;
2697 struct rpc_xprt *xprt;
2698 struct rpc_xprt *ret;
2699
2700 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2701 xprt_max_tcp_slot_table_entries);
2702 if (IS_ERR(xprt))
2703 return xprt;
2704 transport = container_of(xprt, struct sock_xprt, xprt);
2705
2706 xprt->prot = 0;
2707 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2708 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2709
2710 xprt->bind_timeout = XS_BIND_TO;
2711 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2712 xprt->idle_timeout = XS_IDLE_DISC_TO;
2713
2714 xprt->ops = &xs_local_ops;
2715 xprt->timeout = &xs_local_default_timeout;
2716
2717 INIT_DELAYED_WORK(&transport->connect_worker,
2718 xs_dummy_setup_socket);
2719
2720 switch (sun->sun_family) {
2721 case AF_LOCAL:
2722 if (sun->sun_path[0] != '/') {
2723 dprintk("RPC: bad AF_LOCAL address: %s\n",
2724 sun->sun_path);
2725 ret = ERR_PTR(-EINVAL);
2726 goto out_err;
2727 }
2728 xprt_set_bound(xprt);
2729 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2730 ret = ERR_PTR(xs_local_setup_socket(transport));
2731 if (ret)
2732 goto out_err;
2733 break;
2734 default:
2735 ret = ERR_PTR(-EAFNOSUPPORT);
2736 goto out_err;
2737 }
2738
2739 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2740 xprt->address_strings[RPC_DISPLAY_ADDR]);
2741
2742 if (try_module_get(THIS_MODULE))
2743 return xprt;
2744 ret = ERR_PTR(-EINVAL);
2745out_err:
2746 xs_xprt_free(xprt);
2747 return ret;
2748}
2749
2750static const struct rpc_timeout xs_udp_default_timeout = {
2751 .to_initval = 5 * HZ,
2752 .to_maxval = 30 * HZ,
2753 .to_increment = 5 * HZ,
2754 .to_retries = 5,
2755};
2756
2757/**
2758 * xs_setup_udp - Set up transport to use a UDP socket
2759 * @args: rpc transport creation arguments
2760 *
2761 */
2762static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2763{
2764 struct sockaddr *addr = args->dstaddr;
2765 struct rpc_xprt *xprt;
2766 struct sock_xprt *transport;
2767 struct rpc_xprt *ret;
2768
2769 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2770 xprt_udp_slot_table_entries);
2771 if (IS_ERR(xprt))
2772 return xprt;
2773 transport = container_of(xprt, struct sock_xprt, xprt);
2774
2775 xprt->prot = IPPROTO_UDP;
2776 xprt->tsh_size = 0;
2777 /* XXX: header size can vary due to auth type, IPv6, etc. */
2778 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2779
2780 xprt->bind_timeout = XS_BIND_TO;
2781 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2782 xprt->idle_timeout = XS_IDLE_DISC_TO;
2783
2784 xprt->ops = &xs_udp_ops;
2785
2786 xprt->timeout = &xs_udp_default_timeout;
2787
2788 switch (addr->sa_family) {
2789 case AF_INET:
2790 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2791 xprt_set_bound(xprt);
2792
2793 INIT_DELAYED_WORK(&transport->connect_worker,
2794 xs_udp_setup_socket);
2795 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2796 break;
2797 case AF_INET6:
2798 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2799 xprt_set_bound(xprt);
2800
2801 INIT_DELAYED_WORK(&transport->connect_worker,
2802 xs_udp_setup_socket);
2803 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2804 break;
2805 default:
2806 ret = ERR_PTR(-EAFNOSUPPORT);
2807 goto out_err;
2808 }
2809
2810 if (xprt_bound(xprt))
2811 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2812 xprt->address_strings[RPC_DISPLAY_ADDR],
2813 xprt->address_strings[RPC_DISPLAY_PORT],
2814 xprt->address_strings[RPC_DISPLAY_PROTO]);
2815 else
2816 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2817 xprt->address_strings[RPC_DISPLAY_ADDR],
2818 xprt->address_strings[RPC_DISPLAY_PROTO]);
2819
2820 if (try_module_get(THIS_MODULE))
2821 return xprt;
2822 ret = ERR_PTR(-EINVAL);
2823out_err:
2824 xs_xprt_free(xprt);
2825 return ret;
2826}
2827
2828static const struct rpc_timeout xs_tcp_default_timeout = {
2829 .to_initval = 60 * HZ,
2830 .to_maxval = 60 * HZ,
2831 .to_retries = 2,
2832};
2833
2834/**
2835 * xs_setup_tcp - Set up transport to use a TCP socket
2836 * @args: rpc transport creation arguments
2837 *
2838 */
2839static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2840{
2841 struct sockaddr *addr = args->dstaddr;
2842 struct rpc_xprt *xprt;
2843 struct sock_xprt *transport;
2844 struct rpc_xprt *ret;
2845 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2846
2847 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2848 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2849
2850 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2851 max_slot_table_size);
2852 if (IS_ERR(xprt))
2853 return xprt;
2854 transport = container_of(xprt, struct sock_xprt, xprt);
2855
2856 xprt->prot = IPPROTO_TCP;
2857 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2858 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2859
2860 xprt->bind_timeout = XS_BIND_TO;
2861 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2862 xprt->idle_timeout = XS_IDLE_DISC_TO;
2863
2864 xprt->ops = &xs_tcp_ops;
2865 xprt->timeout = &xs_tcp_default_timeout;
2866
2867 switch (addr->sa_family) {
2868 case AF_INET:
2869 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2870 xprt_set_bound(xprt);
2871
2872 INIT_DELAYED_WORK(&transport->connect_worker,
2873 xs_tcp_setup_socket);
2874 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2875 break;
2876 case AF_INET6:
2877 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2878 xprt_set_bound(xprt);
2879
2880 INIT_DELAYED_WORK(&transport->connect_worker,
2881 xs_tcp_setup_socket);
2882 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2883 break;
2884 default:
2885 ret = ERR_PTR(-EAFNOSUPPORT);
2886 goto out_err;
2887 }
2888
2889 if (xprt_bound(xprt))
2890 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2891 xprt->address_strings[RPC_DISPLAY_ADDR],
2892 xprt->address_strings[RPC_DISPLAY_PORT],
2893 xprt->address_strings[RPC_DISPLAY_PROTO]);
2894 else
2895 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2896 xprt->address_strings[RPC_DISPLAY_ADDR],
2897 xprt->address_strings[RPC_DISPLAY_PROTO]);
2898
2899 if (try_module_get(THIS_MODULE))
2900 return xprt;
2901 ret = ERR_PTR(-EINVAL);
2902out_err:
2903 xs_xprt_free(xprt);
2904 return ret;
2905}
2906
2907/**
2908 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2909 * @args: rpc transport creation arguments
2910 *
2911 */
2912static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2913{
2914 struct sockaddr *addr = args->dstaddr;
2915 struct rpc_xprt *xprt;
2916 struct sock_xprt *transport;
2917 struct svc_sock *bc_sock;
2918 struct rpc_xprt *ret;
2919
2920 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2921 xprt_tcp_slot_table_entries);
2922 if (IS_ERR(xprt))
2923 return xprt;
2924 transport = container_of(xprt, struct sock_xprt, xprt);
2925
2926 xprt->prot = IPPROTO_TCP;
2927 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2928 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2929 xprt->timeout = &xs_tcp_default_timeout;
2930
2931 /* backchannel */
2932 xprt_set_bound(xprt);
2933 xprt->bind_timeout = 0;
2934 xprt->reestablish_timeout = 0;
2935 xprt->idle_timeout = 0;
2936
2937 xprt->ops = &bc_tcp_ops;
2938
2939 switch (addr->sa_family) {
2940 case AF_INET:
2941 xs_format_peer_addresses(xprt, "tcp",
2942 RPCBIND_NETID_TCP);
2943 break;
2944 case AF_INET6:
2945 xs_format_peer_addresses(xprt, "tcp",
2946 RPCBIND_NETID_TCP6);
2947 break;
2948 default:
2949 ret = ERR_PTR(-EAFNOSUPPORT);
2950 goto out_err;
2951 }
2952
2953 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2954 xprt->address_strings[RPC_DISPLAY_ADDR],
2955 xprt->address_strings[RPC_DISPLAY_PORT],
2956 xprt->address_strings[RPC_DISPLAY_PROTO]);
2957
2958 /*
2959 * Once we've associated a backchannel xprt with a connection,
2960 * we want to keep it around as long as the connection lasts,
2961 * in case we need to start using it for a backchannel again;
2962 * this reference won't be dropped until bc_xprt is destroyed.
2963 */
2964 xprt_get(xprt);
2965 args->bc_xprt->xpt_bc_xprt = xprt;
2966 xprt->bc_xprt = args->bc_xprt;
2967 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2968 transport->sock = bc_sock->sk_sock;
2969 transport->inet = bc_sock->sk_sk;
2970
2971 /*
2972 * Since we don't want connections for the backchannel, we set
2973 * the xprt status to connected
2974 */
2975 xprt_set_connected(xprt);
2976
2977 if (try_module_get(THIS_MODULE))
2978 return xprt;
2979
2980 args->bc_xprt->xpt_bc_xprt = NULL;
2981 xprt_put(xprt);
2982 ret = ERR_PTR(-EINVAL);
2983out_err:
2984 xs_xprt_free(xprt);
2985 return ret;
2986}
2987
2988static struct xprt_class xs_local_transport = {
2989 .list = LIST_HEAD_INIT(xs_local_transport.list),
2990 .name = "named UNIX socket",
2991 .owner = THIS_MODULE,
2992 .ident = XPRT_TRANSPORT_LOCAL,
2993 .setup = xs_setup_local,
2994};
2995
2996static struct xprt_class xs_udp_transport = {
2997 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2998 .name = "udp",
2999 .owner = THIS_MODULE,
3000 .ident = XPRT_TRANSPORT_UDP,
3001 .setup = xs_setup_udp,
3002};
3003
3004static struct xprt_class xs_tcp_transport = {
3005 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3006 .name = "tcp",
3007 .owner = THIS_MODULE,
3008 .ident = XPRT_TRANSPORT_TCP,
3009 .setup = xs_setup_tcp,
3010};
3011
3012static struct xprt_class xs_bc_tcp_transport = {
3013 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3014 .name = "tcp NFSv4.1 backchannel",
3015 .owner = THIS_MODULE,
3016 .ident = XPRT_TRANSPORT_BC_TCP,
3017 .setup = xs_setup_bc_tcp,
3018};
3019
3020/**
3021 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3022 *
3023 */
3024int init_socket_xprt(void)
3025{
3026#ifdef RPC_DEBUG
3027 if (!sunrpc_table_header)
3028 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3029#endif
3030
3031 xprt_register_transport(&xs_local_transport);
3032 xprt_register_transport(&xs_udp_transport);
3033 xprt_register_transport(&xs_tcp_transport);
3034 xprt_register_transport(&xs_bc_tcp_transport);
3035
3036 return 0;
3037}
3038
3039/**
3040 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3041 *
3042 */
3043void cleanup_socket_xprt(void)
3044{
3045#ifdef RPC_DEBUG
3046 if (sunrpc_table_header) {
3047 unregister_sysctl_table(sunrpc_table_header);
3048 sunrpc_table_header = NULL;
3049 }
3050#endif
3051
3052 xprt_unregister_transport(&xs_local_transport);
3053 xprt_unregister_transport(&xs_udp_transport);
3054 xprt_unregister_transport(&xs_tcp_transport);
3055 xprt_unregister_transport(&xs_bc_tcp_transport);
3056}
3057
3058static int param_set_uint_minmax(const char *val,
3059 const struct kernel_param *kp,
3060 unsigned int min, unsigned int max)
3061{
3062 unsigned int num;
3063 int ret;
3064
3065 if (!val)
3066 return -EINVAL;
3067 ret = kstrtouint(val, 0, &num);
3068 if (ret == -EINVAL || num < min || num > max)
3069 return -EINVAL;
3070 *((unsigned int *)kp->arg) = num;
3071 return 0;
3072}
3073
3074static int param_set_portnr(const char *val, const struct kernel_param *kp)
3075{
3076 return param_set_uint_minmax(val, kp,
3077 RPC_MIN_RESVPORT,
3078 RPC_MAX_RESVPORT);
3079}
3080
3081static struct kernel_param_ops param_ops_portnr = {
3082 .set = param_set_portnr,
3083 .get = param_get_uint,
3084};
3085
3086#define param_check_portnr(name, p) \
3087 __param_check(name, p, unsigned int);
3088
3089module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3090module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3091
3092static int param_set_slot_table_size(const char *val,
3093 const struct kernel_param *kp)
3094{
3095 return param_set_uint_minmax(val, kp,
3096 RPC_MIN_SLOT_TABLE,
3097 RPC_MAX_SLOT_TABLE);
3098}
3099
3100static struct kernel_param_ops param_ops_slot_table_size = {
3101 .set = param_set_slot_table_size,
3102 .get = param_get_uint,
3103};
3104
3105#define param_check_slot_table_size(name, p) \
3106 __param_check(name, p, unsigned int);
3107
3108static int param_set_max_slot_table_size(const char *val,
3109 const struct kernel_param *kp)
3110{
3111 return param_set_uint_minmax(val, kp,
3112 RPC_MIN_SLOT_TABLE,
3113 RPC_MAX_SLOT_TABLE_LIMIT);
3114}
3115
3116static struct kernel_param_ops param_ops_max_slot_table_size = {
3117 .set = param_set_max_slot_table_size,
3118 .get = param_get_uint,
3119};
3120
3121#define param_check_max_slot_table_size(name, p) \
3122 __param_check(name, p, unsigned int);
3123
3124module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3125 slot_table_size, 0644);
3126module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3127 max_slot_table_size, 0644);
3128module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3129 slot_table_size, 0644);
3130
Linux kernel - Deliverables
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