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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/sched.h>
37#include <linux/sunrpc/svcsock.h>
38#include <linux/sunrpc/xprtsock.h>
39#include <linux/file.h>
40#ifdef CONFIG_SUNRPC_BACKCHANNEL
41#include <linux/sunrpc/bc_xprt.h>
42#endif
43
44#include <net/sock.h>
45#include <net/checksum.h>
46#include <net/udp.h>
47#include <net/tcp.h>
48
49#include "sunrpc.h"
50
51static void xs_close(struct rpc_xprt *xprt);
52
53/*
54 * xprtsock tunables
55 */
56unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
59
60unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
62
63#define XS_TCP_LINGER_TO (15U * HZ)
64static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
65
66/*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75#ifdef RPC_DEBUG
76
77static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
79static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
80static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83static struct ctl_table_header *sunrpc_table_header;
84
85/*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89static ctl_table xs_tunables_table[] = {
90 {
91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_minmax,
96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
104 .proc_handler = proc_dointvec_minmax,
105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
117 {
118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec_minmax,
123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_minmax,
132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
140 .proc_handler = proc_dointvec_jiffies,
141 },
142 { },
143};
144
145static ctl_table sunrpc_table[] = {
146 {
147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
151 { },
152};
153
154#endif
155
156/*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159#define XS_BIND_TO (60U * HZ)
160
161/*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165#define XS_UDP_REEST_TO (2U * HZ)
166
167/*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176#define XS_TCP_INIT_REEST_TO (3U * HZ)
177#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179/*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184#define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
186#ifdef RPC_DEBUG
187# undef RPC_DEBUG_DATA
188# define RPCDBG_FACILITY RPCDBG_TRANS
189#endif
190
191#ifdef RPC_DEBUG_DATA
192static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
193{
194 u8 *buf = (u8 *) packet;
195 int j;
196
197 dprintk("RPC: %s\n", msg);
198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208}
209#else
210static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
211{
212 /* NOP */
213}
214#endif
215
216struct sock_xprt {
217 struct rpc_xprt xprt;
218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
229 tcp_xid,
230 tcp_calldir;
231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
237
238 /*
239 * Connection of transports
240 */
241 struct delayed_work connect_worker;
242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
257 void (*old_error_report)(struct sock *);
258};
259
260/*
261 * TCP receive state flags
262 */
263#define TCP_RCV_LAST_FRAG (1UL << 0)
264#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265#define TCP_RCV_COPY_XID (1UL << 2)
266#define TCP_RCV_COPY_DATA (1UL << 3)
267#define TCP_RCV_READ_CALLDIR (1UL << 4)
268#define TCP_RCV_COPY_CALLDIR (1UL << 5)
269
270/*
271 * TCP RPC flags
272 */
273#define TCP_RPC_REPLY (1UL << 6)
274
275static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276{
277 return (struct sockaddr *) &xprt->addr;
278}
279
280static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281{
282 return (struct sockaddr_un *) &xprt->addr;
283}
284
285static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
286{
287 return (struct sockaddr_in *) &xprt->addr;
288}
289
290static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291{
292 return (struct sockaddr_in6 *) &xprt->addr;
293}
294
295static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
296{
297 struct sockaddr *sap = xs_addr(xprt);
298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
300 struct sockaddr_un *sun;
301 char buf[128];
302
303 switch (sap->sa_family) {
304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
310 case AF_INET:
311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
314 sin = xs_addr_in(xprt);
315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
316 break;
317 case AF_INET6:
318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
321 sin6 = xs_addr_in6(xprt);
322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
323 break;
324 default:
325 BUG();
326 }
327
328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
329}
330
331static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
332{
333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
335
336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
338
339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341}
342
343static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
346{
347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
349 xs_format_common_peer_addresses(xprt);
350 xs_format_common_peer_ports(xprt);
351}
352
353static void xs_update_peer_port(struct rpc_xprt *xprt)
354{
355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
357
358 xs_format_common_peer_ports(xprt);
359}
360
361static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362{
363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
373}
374
375#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
377static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
378{
379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
387 };
388
389 if (iov.iov_len != 0)
390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392}
393
394static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
395{
396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
407
408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
423}
424
425/**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
433 */
434static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
435{
436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
438
439 if (unlikely(!sock))
440 return -ENOTSOCK;
441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
447
448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
453 goto out;
454 sent += err;
455 base = 0;
456 } else
457 base -= xdr->head[0].iov_len;
458
459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
464 goto out;
465 sent += err;
466 base = 0;
467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
473out:
474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
479}
480
481static void xs_nospace_callback(struct rpc_task *task)
482{
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487}
488
489/**
490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
492 *
493 */
494static int xs_nospace(struct rpc_task *task)
495{
496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
499 int ret = 0;
500
501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 ret = -EAGAIN;
512 /*
513 * Notify TCP that we're limited by the application
514 * window size
515 */
516 set_bit(SOCK_NOSPACE, &transport->sock->flags);
517 transport->inet->sk_write_pending++;
518 /* ...and wait for more buffer space */
519 xprt_wait_for_buffer_space(task, xs_nospace_callback);
520 }
521 } else {
522 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
523 ret = -ENOTCONN;
524 }
525
526 spin_unlock_bh(&xprt->transport_lock);
527 return ret;
528}
529
530/*
531 * Construct a stream transport record marker in @buf.
532 */
533static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
534{
535 u32 reclen = buf->len - sizeof(rpc_fraghdr);
536 rpc_fraghdr *base = buf->head[0].iov_base;
537 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
538}
539
540/**
541 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
542 * @task: RPC task that manages the state of an RPC request
543 *
544 * Return values:
545 * 0: The request has been sent
546 * EAGAIN: The socket was blocked, please call again later to
547 * complete the request
548 * ENOTCONN: Caller needs to invoke connect logic then call again
549 * other: Some other error occured, the request was not sent
550 */
551static int xs_local_send_request(struct rpc_task *task)
552{
553 struct rpc_rqst *req = task->tk_rqstp;
554 struct rpc_xprt *xprt = req->rq_xprt;
555 struct sock_xprt *transport =
556 container_of(xprt, struct sock_xprt, xprt);
557 struct xdr_buf *xdr = &req->rq_snd_buf;
558 int status;
559
560 xs_encode_stream_record_marker(&req->rq_snd_buf);
561
562 xs_pktdump("packet data:",
563 req->rq_svec->iov_base, req->rq_svec->iov_len);
564
565 status = xs_sendpages(transport->sock, NULL, 0,
566 xdr, req->rq_bytes_sent);
567 dprintk("RPC: %s(%u) = %d\n",
568 __func__, xdr->len - req->rq_bytes_sent, status);
569 if (likely(status >= 0)) {
570 req->rq_bytes_sent += status;
571 req->rq_xmit_bytes_sent += status;
572 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
573 req->rq_bytes_sent = 0;
574 return 0;
575 }
576 status = -EAGAIN;
577 }
578
579 switch (status) {
580 case -EAGAIN:
581 status = xs_nospace(task);
582 break;
583 default:
584 dprintk("RPC: sendmsg returned unrecognized error %d\n",
585 -status);
586 case -EPIPE:
587 xs_close(xprt);
588 status = -ENOTCONN;
589 }
590
591 return status;
592}
593
594/**
595 * xs_udp_send_request - write an RPC request to a UDP socket
596 * @task: address of RPC task that manages the state of an RPC request
597 *
598 * Return values:
599 * 0: The request has been sent
600 * EAGAIN: The socket was blocked, please call again later to
601 * complete the request
602 * ENOTCONN: Caller needs to invoke connect logic then call again
603 * other: Some other error occurred, the request was not sent
604 */
605static int xs_udp_send_request(struct rpc_task *task)
606{
607 struct rpc_rqst *req = task->tk_rqstp;
608 struct rpc_xprt *xprt = req->rq_xprt;
609 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
610 struct xdr_buf *xdr = &req->rq_snd_buf;
611 int status;
612
613 xs_pktdump("packet data:",
614 req->rq_svec->iov_base,
615 req->rq_svec->iov_len);
616
617 if (!xprt_bound(xprt))
618 return -ENOTCONN;
619 status = xs_sendpages(transport->sock,
620 xs_addr(xprt),
621 xprt->addrlen, xdr,
622 req->rq_bytes_sent);
623
624 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
625 xdr->len - req->rq_bytes_sent, status);
626
627 if (status >= 0) {
628 req->rq_xmit_bytes_sent += status;
629 if (status >= req->rq_slen)
630 return 0;
631 /* Still some bytes left; set up for a retry later. */
632 status = -EAGAIN;
633 }
634
635 switch (status) {
636 case -ENOTSOCK:
637 status = -ENOTCONN;
638 /* Should we call xs_close() here? */
639 break;
640 case -EAGAIN:
641 status = xs_nospace(task);
642 break;
643 default:
644 dprintk("RPC: sendmsg returned unrecognized error %d\n",
645 -status);
646 case -ENETUNREACH:
647 case -EPIPE:
648 case -ECONNREFUSED:
649 /* When the server has died, an ICMP port unreachable message
650 * prompts ECONNREFUSED. */
651 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
652 }
653
654 return status;
655}
656
657/**
658 * xs_tcp_shutdown - gracefully shut down a TCP socket
659 * @xprt: transport
660 *
661 * Initiates a graceful shutdown of the TCP socket by calling the
662 * equivalent of shutdown(SHUT_WR);
663 */
664static void xs_tcp_shutdown(struct rpc_xprt *xprt)
665{
666 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
667 struct socket *sock = transport->sock;
668
669 if (sock != NULL)
670 kernel_sock_shutdown(sock, SHUT_WR);
671}
672
673/**
674 * xs_tcp_send_request - write an RPC request to a TCP socket
675 * @task: address of RPC task that manages the state of an RPC request
676 *
677 * Return values:
678 * 0: The request has been sent
679 * EAGAIN: The socket was blocked, please call again later to
680 * complete the request
681 * ENOTCONN: Caller needs to invoke connect logic then call again
682 * other: Some other error occurred, the request was not sent
683 *
684 * XXX: In the case of soft timeouts, should we eventually give up
685 * if sendmsg is not able to make progress?
686 */
687static int xs_tcp_send_request(struct rpc_task *task)
688{
689 struct rpc_rqst *req = task->tk_rqstp;
690 struct rpc_xprt *xprt = req->rq_xprt;
691 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
692 struct xdr_buf *xdr = &req->rq_snd_buf;
693 int status;
694
695 xs_encode_stream_record_marker(&req->rq_snd_buf);
696
697 xs_pktdump("packet data:",
698 req->rq_svec->iov_base,
699 req->rq_svec->iov_len);
700
701 /* Continue transmitting the packet/record. We must be careful
702 * to cope with writespace callbacks arriving _after_ we have
703 * called sendmsg(). */
704 while (1) {
705 status = xs_sendpages(transport->sock,
706 NULL, 0, xdr, req->rq_bytes_sent);
707
708 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
709 xdr->len - req->rq_bytes_sent, status);
710
711 if (unlikely(status < 0))
712 break;
713
714 /* If we've sent the entire packet, immediately
715 * reset the count of bytes sent. */
716 req->rq_bytes_sent += status;
717 req->rq_xmit_bytes_sent += status;
718 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
719 req->rq_bytes_sent = 0;
720 return 0;
721 }
722
723 if (status != 0)
724 continue;
725 status = -EAGAIN;
726 break;
727 }
728
729 switch (status) {
730 case -ENOTSOCK:
731 status = -ENOTCONN;
732 /* Should we call xs_close() here? */
733 break;
734 case -EAGAIN:
735 status = xs_nospace(task);
736 break;
737 default:
738 dprintk("RPC: sendmsg returned unrecognized error %d\n",
739 -status);
740 case -ECONNRESET:
741 case -EPIPE:
742 xs_tcp_shutdown(xprt);
743 case -ECONNREFUSED:
744 case -ENOTCONN:
745 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
746 }
747
748 return status;
749}
750
751/**
752 * xs_tcp_release_xprt - clean up after a tcp transmission
753 * @xprt: transport
754 * @task: rpc task
755 *
756 * This cleans up if an error causes us to abort the transmission of a request.
757 * In this case, the socket may need to be reset in order to avoid confusing
758 * the server.
759 */
760static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
761{
762 struct rpc_rqst *req;
763
764 if (task != xprt->snd_task)
765 return;
766 if (task == NULL)
767 goto out_release;
768 req = task->tk_rqstp;
769 if (req == NULL)
770 goto out_release;
771 if (req->rq_bytes_sent == 0)
772 goto out_release;
773 if (req->rq_bytes_sent == req->rq_snd_buf.len)
774 goto out_release;
775 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
776out_release:
777 xprt_release_xprt(xprt, task);
778}
779
780static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
781{
782 transport->old_data_ready = sk->sk_data_ready;
783 transport->old_state_change = sk->sk_state_change;
784 transport->old_write_space = sk->sk_write_space;
785 transport->old_error_report = sk->sk_error_report;
786}
787
788static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
789{
790 sk->sk_data_ready = transport->old_data_ready;
791 sk->sk_state_change = transport->old_state_change;
792 sk->sk_write_space = transport->old_write_space;
793 sk->sk_error_report = transport->old_error_report;
794}
795
796static void xs_reset_transport(struct sock_xprt *transport)
797{
798 struct socket *sock = transport->sock;
799 struct sock *sk = transport->inet;
800
801 if (sk == NULL)
802 return;
803
804 transport->srcport = 0;
805
806 write_lock_bh(&sk->sk_callback_lock);
807 transport->inet = NULL;
808 transport->sock = NULL;
809
810 sk->sk_user_data = NULL;
811
812 xs_restore_old_callbacks(transport, sk);
813 write_unlock_bh(&sk->sk_callback_lock);
814
815 sk->sk_no_check = 0;
816
817 sock_release(sock);
818}
819
820/**
821 * xs_close - close a socket
822 * @xprt: transport
823 *
824 * This is used when all requests are complete; ie, no DRC state remains
825 * on the server we want to save.
826 *
827 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
828 * xs_reset_transport() zeroing the socket from underneath a writer.
829 */
830static void xs_close(struct rpc_xprt *xprt)
831{
832 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
833
834 dprintk("RPC: xs_close xprt %p\n", xprt);
835
836 xs_reset_transport(transport);
837 xprt->reestablish_timeout = 0;
838
839 smp_mb__before_clear_bit();
840 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
841 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
842 clear_bit(XPRT_CLOSING, &xprt->state);
843 smp_mb__after_clear_bit();
844 xprt_disconnect_done(xprt);
845}
846
847static void xs_tcp_close(struct rpc_xprt *xprt)
848{
849 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
850 xs_close(xprt);
851 else
852 xs_tcp_shutdown(xprt);
853}
854
855/**
856 * xs_destroy - prepare to shutdown a transport
857 * @xprt: doomed transport
858 *
859 */
860static void xs_destroy(struct rpc_xprt *xprt)
861{
862 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
863
864 dprintk("RPC: xs_destroy xprt %p\n", xprt);
865
866 cancel_delayed_work_sync(&transport->connect_worker);
867
868 xs_close(xprt);
869 xs_free_peer_addresses(xprt);
870 xprt_free(xprt);
871 module_put(THIS_MODULE);
872}
873
874static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
875{
876 return (struct rpc_xprt *) sk->sk_user_data;
877}
878
879static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
880{
881 struct xdr_skb_reader desc = {
882 .skb = skb,
883 .offset = sizeof(rpc_fraghdr),
884 .count = skb->len - sizeof(rpc_fraghdr),
885 };
886
887 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
888 return -1;
889 if (desc.count)
890 return -1;
891 return 0;
892}
893
894/**
895 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
896 * @sk: socket with data to read
897 * @len: how much data to read
898 *
899 * Currently this assumes we can read the whole reply in a single gulp.
900 */
901static void xs_local_data_ready(struct sock *sk, int len)
902{
903 struct rpc_task *task;
904 struct rpc_xprt *xprt;
905 struct rpc_rqst *rovr;
906 struct sk_buff *skb;
907 int err, repsize, copied;
908 u32 _xid;
909 __be32 *xp;
910
911 read_lock_bh(&sk->sk_callback_lock);
912 dprintk("RPC: %s...\n", __func__);
913 xprt = xprt_from_sock(sk);
914 if (xprt == NULL)
915 goto out;
916
917 skb = skb_recv_datagram(sk, 0, 1, &err);
918 if (skb == NULL)
919 goto out;
920
921 if (xprt->shutdown)
922 goto dropit;
923
924 repsize = skb->len - sizeof(rpc_fraghdr);
925 if (repsize < 4) {
926 dprintk("RPC: impossible RPC reply size %d\n", repsize);
927 goto dropit;
928 }
929
930 /* Copy the XID from the skb... */
931 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
932 if (xp == NULL)
933 goto dropit;
934
935 /* Look up and lock the request corresponding to the given XID */
936 spin_lock(&xprt->transport_lock);
937 rovr = xprt_lookup_rqst(xprt, *xp);
938 if (!rovr)
939 goto out_unlock;
940 task = rovr->rq_task;
941
942 copied = rovr->rq_private_buf.buflen;
943 if (copied > repsize)
944 copied = repsize;
945
946 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
947 dprintk("RPC: sk_buff copy failed\n");
948 goto out_unlock;
949 }
950
951 xprt_complete_rqst(task, copied);
952
953 out_unlock:
954 spin_unlock(&xprt->transport_lock);
955 dropit:
956 skb_free_datagram(sk, skb);
957 out:
958 read_unlock_bh(&sk->sk_callback_lock);
959}
960
961/**
962 * xs_udp_data_ready - "data ready" callback for UDP sockets
963 * @sk: socket with data to read
964 * @len: how much data to read
965 *
966 */
967static void xs_udp_data_ready(struct sock *sk, int len)
968{
969 struct rpc_task *task;
970 struct rpc_xprt *xprt;
971 struct rpc_rqst *rovr;
972 struct sk_buff *skb;
973 int err, repsize, copied;
974 u32 _xid;
975 __be32 *xp;
976
977 read_lock_bh(&sk->sk_callback_lock);
978 dprintk("RPC: xs_udp_data_ready...\n");
979 if (!(xprt = xprt_from_sock(sk)))
980 goto out;
981
982 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
983 goto out;
984
985 if (xprt->shutdown)
986 goto dropit;
987
988 repsize = skb->len - sizeof(struct udphdr);
989 if (repsize < 4) {
990 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
991 goto dropit;
992 }
993
994 /* Copy the XID from the skb... */
995 xp = skb_header_pointer(skb, sizeof(struct udphdr),
996 sizeof(_xid), &_xid);
997 if (xp == NULL)
998 goto dropit;
999
1000 /* Look up and lock the request corresponding to the given XID */
1001 spin_lock(&xprt->transport_lock);
1002 rovr = xprt_lookup_rqst(xprt, *xp);
1003 if (!rovr)
1004 goto out_unlock;
1005 task = rovr->rq_task;
1006
1007 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1008 copied = repsize;
1009
1010 /* Suck it into the iovec, verify checksum if not done by hw. */
1011 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1012 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1013 goto out_unlock;
1014 }
1015
1016 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1017
1018 /* Something worked... */
1019 dst_confirm(skb_dst(skb));
1020
1021 xprt_adjust_cwnd(task, copied);
1022 xprt_complete_rqst(task, copied);
1023
1024 out_unlock:
1025 spin_unlock(&xprt->transport_lock);
1026 dropit:
1027 skb_free_datagram(sk, skb);
1028 out:
1029 read_unlock_bh(&sk->sk_callback_lock);
1030}
1031
1032static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1033{
1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1035 size_t len, used;
1036 char *p;
1037
1038 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1039 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1040 used = xdr_skb_read_bits(desc, p, len);
1041 transport->tcp_offset += used;
1042 if (used != len)
1043 return;
1044
1045 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1046 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1047 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1048 else
1049 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1050 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1051
1052 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1053 transport->tcp_offset = 0;
1054
1055 /* Sanity check of the record length */
1056 if (unlikely(transport->tcp_reclen < 8)) {
1057 dprintk("RPC: invalid TCP record fragment length\n");
1058 xprt_force_disconnect(xprt);
1059 return;
1060 }
1061 dprintk("RPC: reading TCP record fragment of length %d\n",
1062 transport->tcp_reclen);
1063}
1064
1065static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1066{
1067 if (transport->tcp_offset == transport->tcp_reclen) {
1068 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1069 transport->tcp_offset = 0;
1070 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1071 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1072 transport->tcp_flags |= TCP_RCV_COPY_XID;
1073 transport->tcp_copied = 0;
1074 }
1075 }
1076}
1077
1078static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1079{
1080 size_t len, used;
1081 char *p;
1082
1083 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1084 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1085 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1086 used = xdr_skb_read_bits(desc, p, len);
1087 transport->tcp_offset += used;
1088 if (used != len)
1089 return;
1090 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1091 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1092 transport->tcp_copied = 4;
1093 dprintk("RPC: reading %s XID %08x\n",
1094 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1095 : "request with",
1096 ntohl(transport->tcp_xid));
1097 xs_tcp_check_fraghdr(transport);
1098}
1099
1100static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1101 struct xdr_skb_reader *desc)
1102{
1103 size_t len, used;
1104 u32 offset;
1105 char *p;
1106
1107 /*
1108 * We want transport->tcp_offset to be 8 at the end of this routine
1109 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1110 * When this function is called for the first time,
1111 * transport->tcp_offset is 4 (after having already read the xid).
1112 */
1113 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1114 len = sizeof(transport->tcp_calldir) - offset;
1115 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1116 p = ((char *) &transport->tcp_calldir) + offset;
1117 used = xdr_skb_read_bits(desc, p, len);
1118 transport->tcp_offset += used;
1119 if (used != len)
1120 return;
1121 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1122 /*
1123 * We don't yet have the XDR buffer, so we will write the calldir
1124 * out after we get the buffer from the 'struct rpc_rqst'
1125 */
1126 switch (ntohl(transport->tcp_calldir)) {
1127 case RPC_REPLY:
1128 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1129 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1130 transport->tcp_flags |= TCP_RPC_REPLY;
1131 break;
1132 case RPC_CALL:
1133 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1134 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1135 transport->tcp_flags &= ~TCP_RPC_REPLY;
1136 break;
1137 default:
1138 dprintk("RPC: invalid request message type\n");
1139 xprt_force_disconnect(&transport->xprt);
1140 }
1141 xs_tcp_check_fraghdr(transport);
1142}
1143
1144static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1145 struct xdr_skb_reader *desc,
1146 struct rpc_rqst *req)
1147{
1148 struct sock_xprt *transport =
1149 container_of(xprt, struct sock_xprt, xprt);
1150 struct xdr_buf *rcvbuf;
1151 size_t len;
1152 ssize_t r;
1153
1154 rcvbuf = &req->rq_private_buf;
1155
1156 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1157 /*
1158 * Save the RPC direction in the XDR buffer
1159 */
1160 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1161 &transport->tcp_calldir,
1162 sizeof(transport->tcp_calldir));
1163 transport->tcp_copied += sizeof(transport->tcp_calldir);
1164 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1165 }
1166
1167 len = desc->count;
1168 if (len > transport->tcp_reclen - transport->tcp_offset) {
1169 struct xdr_skb_reader my_desc;
1170
1171 len = transport->tcp_reclen - transport->tcp_offset;
1172 memcpy(&my_desc, desc, sizeof(my_desc));
1173 my_desc.count = len;
1174 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1175 &my_desc, xdr_skb_read_bits);
1176 desc->count -= r;
1177 desc->offset += r;
1178 } else
1179 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1180 desc, xdr_skb_read_bits);
1181
1182 if (r > 0) {
1183 transport->tcp_copied += r;
1184 transport->tcp_offset += r;
1185 }
1186 if (r != len) {
1187 /* Error when copying to the receive buffer,
1188 * usually because we weren't able to allocate
1189 * additional buffer pages. All we can do now
1190 * is turn off TCP_RCV_COPY_DATA, so the request
1191 * will not receive any additional updates,
1192 * and time out.
1193 * Any remaining data from this record will
1194 * be discarded.
1195 */
1196 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1197 dprintk("RPC: XID %08x truncated request\n",
1198 ntohl(transport->tcp_xid));
1199 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1200 "tcp_offset = %u, tcp_reclen = %u\n",
1201 xprt, transport->tcp_copied,
1202 transport->tcp_offset, transport->tcp_reclen);
1203 return;
1204 }
1205
1206 dprintk("RPC: XID %08x read %Zd bytes\n",
1207 ntohl(transport->tcp_xid), r);
1208 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1209 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1210 transport->tcp_offset, transport->tcp_reclen);
1211
1212 if (transport->tcp_copied == req->rq_private_buf.buflen)
1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1214 else if (transport->tcp_offset == transport->tcp_reclen) {
1215 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1216 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1217 }
1218}
1219
1220/*
1221 * Finds the request corresponding to the RPC xid and invokes the common
1222 * tcp read code to read the data.
1223 */
1224static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1225 struct xdr_skb_reader *desc)
1226{
1227 struct sock_xprt *transport =
1228 container_of(xprt, struct sock_xprt, xprt);
1229 struct rpc_rqst *req;
1230
1231 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1232
1233 /* Find and lock the request corresponding to this xid */
1234 spin_lock(&xprt->transport_lock);
1235 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1236 if (!req) {
1237 dprintk("RPC: XID %08x request not found!\n",
1238 ntohl(transport->tcp_xid));
1239 spin_unlock(&xprt->transport_lock);
1240 return -1;
1241 }
1242
1243 xs_tcp_read_common(xprt, desc, req);
1244
1245 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1246 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1247
1248 spin_unlock(&xprt->transport_lock);
1249 return 0;
1250}
1251
1252#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1253/*
1254 * Obtains an rpc_rqst previously allocated and invokes the common
1255 * tcp read code to read the data. The result is placed in the callback
1256 * queue.
1257 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1258 * connection and return -1.
1259 */
1260static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1261 struct xdr_skb_reader *desc)
1262{
1263 struct sock_xprt *transport =
1264 container_of(xprt, struct sock_xprt, xprt);
1265 struct rpc_rqst *req;
1266
1267 req = xprt_alloc_bc_request(xprt);
1268 if (req == NULL) {
1269 printk(KERN_WARNING "Callback slot table overflowed\n");
1270 xprt_force_disconnect(xprt);
1271 return -1;
1272 }
1273
1274 req->rq_xid = transport->tcp_xid;
1275 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1276 xs_tcp_read_common(xprt, desc, req);
1277
1278 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1279 struct svc_serv *bc_serv = xprt->bc_serv;
1280
1281 /*
1282 * Add callback request to callback list. The callback
1283 * service sleeps on the sv_cb_waitq waiting for new
1284 * requests. Wake it up after adding enqueing the
1285 * request.
1286 */
1287 dprintk("RPC: add callback request to list\n");
1288 spin_lock(&bc_serv->sv_cb_lock);
1289 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1290 spin_unlock(&bc_serv->sv_cb_lock);
1291 wake_up(&bc_serv->sv_cb_waitq);
1292 }
1293
1294 req->rq_private_buf.len = transport->tcp_copied;
1295
1296 return 0;
1297}
1298
1299static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1300 struct xdr_skb_reader *desc)
1301{
1302 struct sock_xprt *transport =
1303 container_of(xprt, struct sock_xprt, xprt);
1304
1305 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1306 xs_tcp_read_reply(xprt, desc) :
1307 xs_tcp_read_callback(xprt, desc);
1308}
1309#else
1310static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1311 struct xdr_skb_reader *desc)
1312{
1313 return xs_tcp_read_reply(xprt, desc);
1314}
1315#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1316
1317/*
1318 * Read data off the transport. This can be either an RPC_CALL or an
1319 * RPC_REPLY. Relay the processing to helper functions.
1320 */
1321static void xs_tcp_read_data(struct rpc_xprt *xprt,
1322 struct xdr_skb_reader *desc)
1323{
1324 struct sock_xprt *transport =
1325 container_of(xprt, struct sock_xprt, xprt);
1326
1327 if (_xs_tcp_read_data(xprt, desc) == 0)
1328 xs_tcp_check_fraghdr(transport);
1329 else {
1330 /*
1331 * The transport_lock protects the request handling.
1332 * There's no need to hold it to update the tcp_flags.
1333 */
1334 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1335 }
1336}
1337
1338static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1339{
1340 size_t len;
1341
1342 len = transport->tcp_reclen - transport->tcp_offset;
1343 if (len > desc->count)
1344 len = desc->count;
1345 desc->count -= len;
1346 desc->offset += len;
1347 transport->tcp_offset += len;
1348 dprintk("RPC: discarded %Zu bytes\n", len);
1349 xs_tcp_check_fraghdr(transport);
1350}
1351
1352static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1353{
1354 struct rpc_xprt *xprt = rd_desc->arg.data;
1355 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1356 struct xdr_skb_reader desc = {
1357 .skb = skb,
1358 .offset = offset,
1359 .count = len,
1360 };
1361
1362 dprintk("RPC: xs_tcp_data_recv started\n");
1363 do {
1364 /* Read in a new fragment marker if necessary */
1365 /* Can we ever really expect to get completely empty fragments? */
1366 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1367 xs_tcp_read_fraghdr(xprt, &desc);
1368 continue;
1369 }
1370 /* Read in the xid if necessary */
1371 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1372 xs_tcp_read_xid(transport, &desc);
1373 continue;
1374 }
1375 /* Read in the call/reply flag */
1376 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1377 xs_tcp_read_calldir(transport, &desc);
1378 continue;
1379 }
1380 /* Read in the request data */
1381 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1382 xs_tcp_read_data(xprt, &desc);
1383 continue;
1384 }
1385 /* Skip over any trailing bytes on short reads */
1386 xs_tcp_read_discard(transport, &desc);
1387 } while (desc.count);
1388 dprintk("RPC: xs_tcp_data_recv done\n");
1389 return len - desc.count;
1390}
1391
1392/**
1393 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1394 * @sk: socket with data to read
1395 * @bytes: how much data to read
1396 *
1397 */
1398static void xs_tcp_data_ready(struct sock *sk, int bytes)
1399{
1400 struct rpc_xprt *xprt;
1401 read_descriptor_t rd_desc;
1402 int read;
1403
1404 dprintk("RPC: xs_tcp_data_ready...\n");
1405
1406 read_lock_bh(&sk->sk_callback_lock);
1407 if (!(xprt = xprt_from_sock(sk)))
1408 goto out;
1409 if (xprt->shutdown)
1410 goto out;
1411
1412 /* Any data means we had a useful conversation, so
1413 * the we don't need to delay the next reconnect
1414 */
1415 if (xprt->reestablish_timeout)
1416 xprt->reestablish_timeout = 0;
1417
1418 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1419 rd_desc.arg.data = xprt;
1420 do {
1421 rd_desc.count = 65536;
1422 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1423 } while (read > 0);
1424out:
1425 read_unlock_bh(&sk->sk_callback_lock);
1426}
1427
1428/*
1429 * Do the equivalent of linger/linger2 handling for dealing with
1430 * broken servers that don't close the socket in a timely
1431 * fashion
1432 */
1433static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1434 unsigned long timeout)
1435{
1436 struct sock_xprt *transport;
1437
1438 if (xprt_test_and_set_connecting(xprt))
1439 return;
1440 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1441 transport = container_of(xprt, struct sock_xprt, xprt);
1442 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1443 timeout);
1444}
1445
1446static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1447{
1448 struct sock_xprt *transport;
1449
1450 transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1453 !cancel_delayed_work(&transport->connect_worker))
1454 return;
1455 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1456 xprt_clear_connecting(xprt);
1457}
1458
1459static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1460{
1461 smp_mb__before_clear_bit();
1462 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1463 clear_bit(XPRT_CLOSING, &xprt->state);
1464 smp_mb__after_clear_bit();
1465 /* Mark transport as closed and wake up all pending tasks */
1466 xprt_disconnect_done(xprt);
1467}
1468
1469/**
1470 * xs_tcp_state_change - callback to handle TCP socket state changes
1471 * @sk: socket whose state has changed
1472 *
1473 */
1474static void xs_tcp_state_change(struct sock *sk)
1475{
1476 struct rpc_xprt *xprt;
1477
1478 read_lock_bh(&sk->sk_callback_lock);
1479 if (!(xprt = xprt_from_sock(sk)))
1480 goto out;
1481 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1482 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1483 sk->sk_state, xprt_connected(xprt),
1484 sock_flag(sk, SOCK_DEAD),
1485 sock_flag(sk, SOCK_ZAPPED),
1486 sk->sk_shutdown);
1487
1488 switch (sk->sk_state) {
1489 case TCP_ESTABLISHED:
1490 spin_lock(&xprt->transport_lock);
1491 if (!xprt_test_and_set_connected(xprt)) {
1492 struct sock_xprt *transport = container_of(xprt,
1493 struct sock_xprt, xprt);
1494
1495 /* Reset TCP record info */
1496 transport->tcp_offset = 0;
1497 transport->tcp_reclen = 0;
1498 transport->tcp_copied = 0;
1499 transport->tcp_flags =
1500 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1501
1502 xprt_wake_pending_tasks(xprt, -EAGAIN);
1503 }
1504 spin_unlock(&xprt->transport_lock);
1505 break;
1506 case TCP_FIN_WAIT1:
1507 /* The client initiated a shutdown of the socket */
1508 xprt->connect_cookie++;
1509 xprt->reestablish_timeout = 0;
1510 set_bit(XPRT_CLOSING, &xprt->state);
1511 smp_mb__before_clear_bit();
1512 clear_bit(XPRT_CONNECTED, &xprt->state);
1513 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1514 smp_mb__after_clear_bit();
1515 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1516 break;
1517 case TCP_CLOSE_WAIT:
1518 /* The server initiated a shutdown of the socket */
1519 xprt_force_disconnect(xprt);
1520 xprt->connect_cookie++;
1521 case TCP_CLOSING:
1522 /*
1523 * If the server closed down the connection, make sure that
1524 * we back off before reconnecting
1525 */
1526 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1527 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1528 break;
1529 case TCP_LAST_ACK:
1530 set_bit(XPRT_CLOSING, &xprt->state);
1531 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1532 smp_mb__before_clear_bit();
1533 clear_bit(XPRT_CONNECTED, &xprt->state);
1534 smp_mb__after_clear_bit();
1535 break;
1536 case TCP_CLOSE:
1537 xs_tcp_cancel_linger_timeout(xprt);
1538 xs_sock_mark_closed(xprt);
1539 }
1540 out:
1541 read_unlock_bh(&sk->sk_callback_lock);
1542}
1543
1544/**
1545 * xs_error_report - callback mainly for catching socket errors
1546 * @sk: socket
1547 */
1548static void xs_error_report(struct sock *sk)
1549{
1550 struct rpc_xprt *xprt;
1551
1552 read_lock_bh(&sk->sk_callback_lock);
1553 if (!(xprt = xprt_from_sock(sk)))
1554 goto out;
1555 dprintk("RPC: %s client %p...\n"
1556 "RPC: error %d\n",
1557 __func__, xprt, sk->sk_err);
1558 xprt_wake_pending_tasks(xprt, -EAGAIN);
1559out:
1560 read_unlock_bh(&sk->sk_callback_lock);
1561}
1562
1563static void xs_write_space(struct sock *sk)
1564{
1565 struct socket *sock;
1566 struct rpc_xprt *xprt;
1567
1568 if (unlikely(!(sock = sk->sk_socket)))
1569 return;
1570 clear_bit(SOCK_NOSPACE, &sock->flags);
1571
1572 if (unlikely(!(xprt = xprt_from_sock(sk))))
1573 return;
1574 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1575 return;
1576
1577 xprt_write_space(xprt);
1578}
1579
1580/**
1581 * xs_udp_write_space - callback invoked when socket buffer space
1582 * becomes available
1583 * @sk: socket whose state has changed
1584 *
1585 * Called when more output buffer space is available for this socket.
1586 * We try not to wake our writers until they can make "significant"
1587 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1588 * with a bunch of small requests.
1589 */
1590static void xs_udp_write_space(struct sock *sk)
1591{
1592 read_lock_bh(&sk->sk_callback_lock);
1593
1594 /* from net/core/sock.c:sock_def_write_space */
1595 if (sock_writeable(sk))
1596 xs_write_space(sk);
1597
1598 read_unlock_bh(&sk->sk_callback_lock);
1599}
1600
1601/**
1602 * xs_tcp_write_space - callback invoked when socket buffer space
1603 * becomes available
1604 * @sk: socket whose state has changed
1605 *
1606 * Called when more output buffer space is available for this socket.
1607 * We try not to wake our writers until they can make "significant"
1608 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1609 * with a bunch of small requests.
1610 */
1611static void xs_tcp_write_space(struct sock *sk)
1612{
1613 read_lock_bh(&sk->sk_callback_lock);
1614
1615 /* from net/core/stream.c:sk_stream_write_space */
1616 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1617 xs_write_space(sk);
1618
1619 read_unlock_bh(&sk->sk_callback_lock);
1620}
1621
1622static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1623{
1624 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1625 struct sock *sk = transport->inet;
1626
1627 if (transport->rcvsize) {
1628 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1629 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1630 }
1631 if (transport->sndsize) {
1632 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1633 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1634 sk->sk_write_space(sk);
1635 }
1636}
1637
1638/**
1639 * xs_udp_set_buffer_size - set send and receive limits
1640 * @xprt: generic transport
1641 * @sndsize: requested size of send buffer, in bytes
1642 * @rcvsize: requested size of receive buffer, in bytes
1643 *
1644 * Set socket send and receive buffer size limits.
1645 */
1646static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1647{
1648 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1649
1650 transport->sndsize = 0;
1651 if (sndsize)
1652 transport->sndsize = sndsize + 1024;
1653 transport->rcvsize = 0;
1654 if (rcvsize)
1655 transport->rcvsize = rcvsize + 1024;
1656
1657 xs_udp_do_set_buffer_size(xprt);
1658}
1659
1660/**
1661 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1662 * @task: task that timed out
1663 *
1664 * Adjust the congestion window after a retransmit timeout has occurred.
1665 */
1666static void xs_udp_timer(struct rpc_task *task)
1667{
1668 xprt_adjust_cwnd(task, -ETIMEDOUT);
1669}
1670
1671static unsigned short xs_get_random_port(void)
1672{
1673 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1674 unsigned short rand = (unsigned short) net_random() % range;
1675 return rand + xprt_min_resvport;
1676}
1677
1678/**
1679 * xs_set_port - reset the port number in the remote endpoint address
1680 * @xprt: generic transport
1681 * @port: new port number
1682 *
1683 */
1684static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1685{
1686 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1687
1688 rpc_set_port(xs_addr(xprt), port);
1689 xs_update_peer_port(xprt);
1690}
1691
1692static unsigned short xs_get_srcport(struct sock_xprt *transport)
1693{
1694 unsigned short port = transport->srcport;
1695
1696 if (port == 0 && transport->xprt.resvport)
1697 port = xs_get_random_port();
1698 return port;
1699}
1700
1701static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1702{
1703 if (transport->srcport != 0)
1704 transport->srcport = 0;
1705 if (!transport->xprt.resvport)
1706 return 0;
1707 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1708 return xprt_max_resvport;
1709 return --port;
1710}
1711static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1712{
1713 struct sockaddr_storage myaddr;
1714 int err, nloop = 0;
1715 unsigned short port = xs_get_srcport(transport);
1716 unsigned short last;
1717
1718 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1719 do {
1720 rpc_set_port((struct sockaddr *)&myaddr, port);
1721 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1722 transport->xprt.addrlen);
1723 if (port == 0)
1724 break;
1725 if (err == 0) {
1726 transport->srcport = port;
1727 break;
1728 }
1729 last = port;
1730 port = xs_next_srcport(transport, port);
1731 if (port > last)
1732 nloop++;
1733 } while (err == -EADDRINUSE && nloop != 2);
1734
1735 if (myaddr.ss_family == AF_INET)
1736 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in *)&myaddr)->sin_addr,
1738 port, err ? "failed" : "ok", err);
1739 else
1740 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1741 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1742 port, err ? "failed" : "ok", err);
1743 return err;
1744}
1745
1746/*
1747 * We don't support autobind on AF_LOCAL sockets
1748 */
1749static void xs_local_rpcbind(struct rpc_task *task)
1750{
1751 xprt_set_bound(task->tk_xprt);
1752}
1753
1754static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1755{
1756}
1757
1758#ifdef CONFIG_DEBUG_LOCK_ALLOC
1759static struct lock_class_key xs_key[2];
1760static struct lock_class_key xs_slock_key[2];
1761
1762static inline void xs_reclassify_socketu(struct socket *sock)
1763{
1764 struct sock *sk = sock->sk;
1765
1766 BUG_ON(sock_owned_by_user(sk));
1767 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1768 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1769}
1770
1771static inline void xs_reclassify_socket4(struct socket *sock)
1772{
1773 struct sock *sk = sock->sk;
1774
1775 BUG_ON(sock_owned_by_user(sk));
1776 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1777 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1778}
1779
1780static inline void xs_reclassify_socket6(struct socket *sock)
1781{
1782 struct sock *sk = sock->sk;
1783
1784 BUG_ON(sock_owned_by_user(sk));
1785 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1786 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1787}
1788
1789static inline void xs_reclassify_socket(int family, struct socket *sock)
1790{
1791 switch (family) {
1792 case AF_LOCAL:
1793 xs_reclassify_socketu(sock);
1794 break;
1795 case AF_INET:
1796 xs_reclassify_socket4(sock);
1797 break;
1798 case AF_INET6:
1799 xs_reclassify_socket6(sock);
1800 break;
1801 }
1802}
1803#else
1804static inline void xs_reclassify_socketu(struct socket *sock)
1805{
1806}
1807
1808static inline void xs_reclassify_socket4(struct socket *sock)
1809{
1810}
1811
1812static inline void xs_reclassify_socket6(struct socket *sock)
1813{
1814}
1815
1816static inline void xs_reclassify_socket(int family, struct socket *sock)
1817{
1818}
1819#endif
1820
1821static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1822 struct sock_xprt *transport, int family, int type, int protocol)
1823{
1824 struct socket *sock;
1825 int err;
1826
1827 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1828 if (err < 0) {
1829 dprintk("RPC: can't create %d transport socket (%d).\n",
1830 protocol, -err);
1831 goto out;
1832 }
1833 xs_reclassify_socket(family, sock);
1834
1835 err = xs_bind(transport, sock);
1836 if (err) {
1837 sock_release(sock);
1838 goto out;
1839 }
1840
1841 return sock;
1842out:
1843 return ERR_PTR(err);
1844}
1845
1846static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1847 struct socket *sock)
1848{
1849 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1850 xprt);
1851
1852 if (!transport->inet) {
1853 struct sock *sk = sock->sk;
1854
1855 write_lock_bh(&sk->sk_callback_lock);
1856
1857 xs_save_old_callbacks(transport, sk);
1858
1859 sk->sk_user_data = xprt;
1860 sk->sk_data_ready = xs_local_data_ready;
1861 sk->sk_write_space = xs_udp_write_space;
1862 sk->sk_error_report = xs_error_report;
1863 sk->sk_allocation = GFP_ATOMIC;
1864
1865 xprt_clear_connected(xprt);
1866
1867 /* Reset to new socket */
1868 transport->sock = sock;
1869 transport->inet = sk;
1870
1871 write_unlock_bh(&sk->sk_callback_lock);
1872 }
1873
1874 /* Tell the socket layer to start connecting... */
1875 xprt->stat.connect_count++;
1876 xprt->stat.connect_start = jiffies;
1877 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1878}
1879
1880/**
1881 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1882 * @xprt: RPC transport to connect
1883 * @transport: socket transport to connect
1884 * @create_sock: function to create a socket of the correct type
1885 *
1886 * Invoked by a work queue tasklet.
1887 */
1888static void xs_local_setup_socket(struct work_struct *work)
1889{
1890 struct sock_xprt *transport =
1891 container_of(work, struct sock_xprt, connect_worker.work);
1892 struct rpc_xprt *xprt = &transport->xprt;
1893 struct socket *sock;
1894 int status = -EIO;
1895
1896 if (xprt->shutdown)
1897 goto out;
1898
1899 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1900 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1901 SOCK_STREAM, 0, &sock, 1);
1902 if (status < 0) {
1903 dprintk("RPC: can't create AF_LOCAL "
1904 "transport socket (%d).\n", -status);
1905 goto out;
1906 }
1907 xs_reclassify_socketu(sock);
1908
1909 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1910 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1911
1912 status = xs_local_finish_connecting(xprt, sock);
1913 switch (status) {
1914 case 0:
1915 dprintk("RPC: xprt %p connected to %s\n",
1916 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1917 xprt_set_connected(xprt);
1918 break;
1919 case -ENOENT:
1920 dprintk("RPC: xprt %p: socket %s does not exist\n",
1921 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1922 break;
1923 default:
1924 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1925 __func__, -status,
1926 xprt->address_strings[RPC_DISPLAY_ADDR]);
1927 }
1928
1929out:
1930 xprt_clear_connecting(xprt);
1931 xprt_wake_pending_tasks(xprt, status);
1932}
1933
1934static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1935{
1936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1937
1938 if (!transport->inet) {
1939 struct sock *sk = sock->sk;
1940
1941 write_lock_bh(&sk->sk_callback_lock);
1942
1943 xs_save_old_callbacks(transport, sk);
1944
1945 sk->sk_user_data = xprt;
1946 sk->sk_data_ready = xs_udp_data_ready;
1947 sk->sk_write_space = xs_udp_write_space;
1948 sk->sk_error_report = xs_error_report;
1949 sk->sk_no_check = UDP_CSUM_NORCV;
1950 sk->sk_allocation = GFP_ATOMIC;
1951
1952 xprt_set_connected(xprt);
1953
1954 /* Reset to new socket */
1955 transport->sock = sock;
1956 transport->inet = sk;
1957
1958 write_unlock_bh(&sk->sk_callback_lock);
1959 }
1960 xs_udp_do_set_buffer_size(xprt);
1961}
1962
1963static void xs_udp_setup_socket(struct work_struct *work)
1964{
1965 struct sock_xprt *transport =
1966 container_of(work, struct sock_xprt, connect_worker.work);
1967 struct rpc_xprt *xprt = &transport->xprt;
1968 struct socket *sock = transport->sock;
1969 int status = -EIO;
1970
1971 if (xprt->shutdown)
1972 goto out;
1973
1974 /* Start by resetting any existing state */
1975 xs_reset_transport(transport);
1976 sock = xs_create_sock(xprt, transport,
1977 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1978 if (IS_ERR(sock))
1979 goto out;
1980
1981 dprintk("RPC: worker connecting xprt %p via %s to "
1982 "%s (port %s)\n", xprt,
1983 xprt->address_strings[RPC_DISPLAY_PROTO],
1984 xprt->address_strings[RPC_DISPLAY_ADDR],
1985 xprt->address_strings[RPC_DISPLAY_PORT]);
1986
1987 xs_udp_finish_connecting(xprt, sock);
1988 status = 0;
1989out:
1990 xprt_clear_connecting(xprt);
1991 xprt_wake_pending_tasks(xprt, status);
1992}
1993
1994/*
1995 * We need to preserve the port number so the reply cache on the server can
1996 * find our cached RPC replies when we get around to reconnecting.
1997 */
1998static void xs_abort_connection(struct sock_xprt *transport)
1999{
2000 int result;
2001 struct sockaddr any;
2002
2003 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
2004
2005 /*
2006 * Disconnect the transport socket by doing a connect operation
2007 * with AF_UNSPEC. This should return immediately...
2008 */
2009 memset(&any, 0, sizeof(any));
2010 any.sa_family = AF_UNSPEC;
2011 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2012 if (!result)
2013 xs_sock_mark_closed(&transport->xprt);
2014 else
2015 dprintk("RPC: AF_UNSPEC connect return code %d\n",
2016 result);
2017}
2018
2019static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2020{
2021 unsigned int state = transport->inet->sk_state;
2022
2023 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2024 /* we don't need to abort the connection if the socket
2025 * hasn't undergone a shutdown
2026 */
2027 if (transport->inet->sk_shutdown == 0)
2028 return;
2029 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2030 __func__, transport->inet->sk_shutdown);
2031 }
2032 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2033 /* we don't need to abort the connection if the socket
2034 * hasn't undergone a shutdown
2035 */
2036 if (transport->inet->sk_shutdown == 0)
2037 return;
2038 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2039 "sk_shutdown set to %d\n",
2040 __func__, transport->inet->sk_shutdown);
2041 }
2042 xs_abort_connection(transport);
2043}
2044
2045static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2046{
2047 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2048 int ret = -ENOTCONN;
2049
2050 if (!transport->inet) {
2051 struct sock *sk = sock->sk;
2052
2053 write_lock_bh(&sk->sk_callback_lock);
2054
2055 xs_save_old_callbacks(transport, sk);
2056
2057 sk->sk_user_data = xprt;
2058 sk->sk_data_ready = xs_tcp_data_ready;
2059 sk->sk_state_change = xs_tcp_state_change;
2060 sk->sk_write_space = xs_tcp_write_space;
2061 sk->sk_error_report = xs_error_report;
2062 sk->sk_allocation = GFP_ATOMIC;
2063
2064 /* socket options */
2065 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2066 sock_reset_flag(sk, SOCK_LINGER);
2067 tcp_sk(sk)->linger2 = 0;
2068 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2069
2070 xprt_clear_connected(xprt);
2071
2072 /* Reset to new socket */
2073 transport->sock = sock;
2074 transport->inet = sk;
2075
2076 write_unlock_bh(&sk->sk_callback_lock);
2077 }
2078
2079 if (!xprt_bound(xprt))
2080 goto out;
2081
2082 /* Tell the socket layer to start connecting... */
2083 xprt->stat.connect_count++;
2084 xprt->stat.connect_start = jiffies;
2085 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2086 switch (ret) {
2087 case 0:
2088 case -EINPROGRESS:
2089 /* SYN_SENT! */
2090 xprt->connect_cookie++;
2091 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2092 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2093 }
2094out:
2095 return ret;
2096}
2097
2098/**
2099 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2100 * @xprt: RPC transport to connect
2101 * @transport: socket transport to connect
2102 * @create_sock: function to create a socket of the correct type
2103 *
2104 * Invoked by a work queue tasklet.
2105 */
2106static void xs_tcp_setup_socket(struct work_struct *work)
2107{
2108 struct sock_xprt *transport =
2109 container_of(work, struct sock_xprt, connect_worker.work);
2110 struct socket *sock = transport->sock;
2111 struct rpc_xprt *xprt = &transport->xprt;
2112 int status = -EIO;
2113
2114 if (xprt->shutdown)
2115 goto out;
2116
2117 if (!sock) {
2118 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2119 sock = xs_create_sock(xprt, transport,
2120 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2121 if (IS_ERR(sock)) {
2122 status = PTR_ERR(sock);
2123 goto out;
2124 }
2125 } else {
2126 int abort_and_exit;
2127
2128 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2129 &xprt->state);
2130 /* "close" the socket, preserving the local port */
2131 xs_tcp_reuse_connection(transport);
2132
2133 if (abort_and_exit)
2134 goto out_eagain;
2135 }
2136
2137 dprintk("RPC: worker connecting xprt %p via %s to "
2138 "%s (port %s)\n", xprt,
2139 xprt->address_strings[RPC_DISPLAY_PROTO],
2140 xprt->address_strings[RPC_DISPLAY_ADDR],
2141 xprt->address_strings[RPC_DISPLAY_PORT]);
2142
2143 status = xs_tcp_finish_connecting(xprt, sock);
2144 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2145 xprt, -status, xprt_connected(xprt),
2146 sock->sk->sk_state);
2147 switch (status) {
2148 default:
2149 printk("%s: connect returned unhandled error %d\n",
2150 __func__, status);
2151 case -EADDRNOTAVAIL:
2152 /* We're probably in TIME_WAIT. Get rid of existing socket,
2153 * and retry
2154 */
2155 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
2156 xprt_force_disconnect(xprt);
2157 break;
2158 case -ECONNREFUSED:
2159 case -ECONNRESET:
2160 case -ENETUNREACH:
2161 /* retry with existing socket, after a delay */
2162 case 0:
2163 case -EINPROGRESS:
2164 case -EALREADY:
2165 xprt_clear_connecting(xprt);
2166 return;
2167 case -EINVAL:
2168 /* Happens, for instance, if the user specified a link
2169 * local IPv6 address without a scope-id.
2170 */
2171 goto out;
2172 }
2173out_eagain:
2174 status = -EAGAIN;
2175out:
2176 xprt_clear_connecting(xprt);
2177 xprt_wake_pending_tasks(xprt, status);
2178}
2179
2180/**
2181 * xs_connect - connect a socket to a remote endpoint
2182 * @task: address of RPC task that manages state of connect request
2183 *
2184 * TCP: If the remote end dropped the connection, delay reconnecting.
2185 *
2186 * UDP socket connects are synchronous, but we use a work queue anyway
2187 * to guarantee that even unprivileged user processes can set up a
2188 * socket on a privileged port.
2189 *
2190 * If a UDP socket connect fails, the delay behavior here prevents
2191 * retry floods (hard mounts).
2192 */
2193static void xs_connect(struct rpc_task *task)
2194{
2195 struct rpc_xprt *xprt = task->tk_xprt;
2196 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2197
2198 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2199 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2200 "seconds\n",
2201 xprt, xprt->reestablish_timeout / HZ);
2202 queue_delayed_work(rpciod_workqueue,
2203 &transport->connect_worker,
2204 xprt->reestablish_timeout);
2205 xprt->reestablish_timeout <<= 1;
2206 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2207 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2208 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2209 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2210 } else {
2211 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2212 queue_delayed_work(rpciod_workqueue,
2213 &transport->connect_worker, 0);
2214 }
2215}
2216
2217/**
2218 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2219 * @xprt: rpc_xprt struct containing statistics
2220 * @seq: output file
2221 *
2222 */
2223static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2224{
2225 long idle_time = 0;
2226
2227 if (xprt_connected(xprt))
2228 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2229
2230 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2231 "%llu %llu\n",
2232 xprt->stat.bind_count,
2233 xprt->stat.connect_count,
2234 xprt->stat.connect_time,
2235 idle_time,
2236 xprt->stat.sends,
2237 xprt->stat.recvs,
2238 xprt->stat.bad_xids,
2239 xprt->stat.req_u,
2240 xprt->stat.bklog_u);
2241}
2242
2243/**
2244 * xs_udp_print_stats - display UDP socket-specifc stats
2245 * @xprt: rpc_xprt struct containing statistics
2246 * @seq: output file
2247 *
2248 */
2249static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2250{
2251 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2252
2253 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2254 transport->srcport,
2255 xprt->stat.bind_count,
2256 xprt->stat.sends,
2257 xprt->stat.recvs,
2258 xprt->stat.bad_xids,
2259 xprt->stat.req_u,
2260 xprt->stat.bklog_u);
2261}
2262
2263/**
2264 * xs_tcp_print_stats - display TCP socket-specifc stats
2265 * @xprt: rpc_xprt struct containing statistics
2266 * @seq: output file
2267 *
2268 */
2269static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2270{
2271 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2272 long idle_time = 0;
2273
2274 if (xprt_connected(xprt))
2275 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2276
2277 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2278 transport->srcport,
2279 xprt->stat.bind_count,
2280 xprt->stat.connect_count,
2281 xprt->stat.connect_time,
2282 idle_time,
2283 xprt->stat.sends,
2284 xprt->stat.recvs,
2285 xprt->stat.bad_xids,
2286 xprt->stat.req_u,
2287 xprt->stat.bklog_u);
2288}
2289
2290/*
2291 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2292 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2293 * to use the server side send routines.
2294 */
2295static void *bc_malloc(struct rpc_task *task, size_t size)
2296{
2297 struct page *page;
2298 struct rpc_buffer *buf;
2299
2300 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2301 page = alloc_page(GFP_KERNEL);
2302
2303 if (!page)
2304 return NULL;
2305
2306 buf = page_address(page);
2307 buf->len = PAGE_SIZE;
2308
2309 return buf->data;
2310}
2311
2312/*
2313 * Free the space allocated in the bc_alloc routine
2314 */
2315static void bc_free(void *buffer)
2316{
2317 struct rpc_buffer *buf;
2318
2319 if (!buffer)
2320 return;
2321
2322 buf = container_of(buffer, struct rpc_buffer, data);
2323 free_page((unsigned long)buf);
2324}
2325
2326/*
2327 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2328 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2329 */
2330static int bc_sendto(struct rpc_rqst *req)
2331{
2332 int len;
2333 struct xdr_buf *xbufp = &req->rq_snd_buf;
2334 struct rpc_xprt *xprt = req->rq_xprt;
2335 struct sock_xprt *transport =
2336 container_of(xprt, struct sock_xprt, xprt);
2337 struct socket *sock = transport->sock;
2338 unsigned long headoff;
2339 unsigned long tailoff;
2340
2341 xs_encode_stream_record_marker(xbufp);
2342
2343 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2344 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2345 len = svc_send_common(sock, xbufp,
2346 virt_to_page(xbufp->head[0].iov_base), headoff,
2347 xbufp->tail[0].iov_base, tailoff);
2348
2349 if (len != xbufp->len) {
2350 printk(KERN_NOTICE "Error sending entire callback!\n");
2351 len = -EAGAIN;
2352 }
2353
2354 return len;
2355}
2356
2357/*
2358 * The send routine. Borrows from svc_send
2359 */
2360static int bc_send_request(struct rpc_task *task)
2361{
2362 struct rpc_rqst *req = task->tk_rqstp;
2363 struct svc_xprt *xprt;
2364 struct svc_sock *svsk;
2365 u32 len;
2366
2367 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2368 /*
2369 * Get the server socket associated with this callback xprt
2370 */
2371 xprt = req->rq_xprt->bc_xprt;
2372 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2373
2374 /*
2375 * Grab the mutex to serialize data as the connection is shared
2376 * with the fore channel
2377 */
2378 if (!mutex_trylock(&xprt->xpt_mutex)) {
2379 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2380 if (!mutex_trylock(&xprt->xpt_mutex))
2381 return -EAGAIN;
2382 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2383 }
2384 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2385 len = -ENOTCONN;
2386 else
2387 len = bc_sendto(req);
2388 mutex_unlock(&xprt->xpt_mutex);
2389
2390 if (len > 0)
2391 len = 0;
2392
2393 return len;
2394}
2395
2396/*
2397 * The close routine. Since this is client initiated, we do nothing
2398 */
2399
2400static void bc_close(struct rpc_xprt *xprt)
2401{
2402}
2403
2404/*
2405 * The xprt destroy routine. Again, because this connection is client
2406 * initiated, we do nothing
2407 */
2408
2409static void bc_destroy(struct rpc_xprt *xprt)
2410{
2411}
2412
2413static struct rpc_xprt_ops xs_local_ops = {
2414 .reserve_xprt = xprt_reserve_xprt,
2415 .release_xprt = xs_tcp_release_xprt,
2416 .rpcbind = xs_local_rpcbind,
2417 .set_port = xs_local_set_port,
2418 .connect = xs_connect,
2419 .buf_alloc = rpc_malloc,
2420 .buf_free = rpc_free,
2421 .send_request = xs_local_send_request,
2422 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2423 .close = xs_close,
2424 .destroy = xs_destroy,
2425 .print_stats = xs_local_print_stats,
2426};
2427
2428static struct rpc_xprt_ops xs_udp_ops = {
2429 .set_buffer_size = xs_udp_set_buffer_size,
2430 .reserve_xprt = xprt_reserve_xprt_cong,
2431 .release_xprt = xprt_release_xprt_cong,
2432 .rpcbind = rpcb_getport_async,
2433 .set_port = xs_set_port,
2434 .connect = xs_connect,
2435 .buf_alloc = rpc_malloc,
2436 .buf_free = rpc_free,
2437 .send_request = xs_udp_send_request,
2438 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2439 .timer = xs_udp_timer,
2440 .release_request = xprt_release_rqst_cong,
2441 .close = xs_close,
2442 .destroy = xs_destroy,
2443 .print_stats = xs_udp_print_stats,
2444};
2445
2446static struct rpc_xprt_ops xs_tcp_ops = {
2447 .reserve_xprt = xprt_reserve_xprt,
2448 .release_xprt = xs_tcp_release_xprt,
2449 .rpcbind = rpcb_getport_async,
2450 .set_port = xs_set_port,
2451 .connect = xs_connect,
2452 .buf_alloc = rpc_malloc,
2453 .buf_free = rpc_free,
2454 .send_request = xs_tcp_send_request,
2455 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2456 .close = xs_tcp_close,
2457 .destroy = xs_destroy,
2458 .print_stats = xs_tcp_print_stats,
2459};
2460
2461/*
2462 * The rpc_xprt_ops for the server backchannel
2463 */
2464
2465static struct rpc_xprt_ops bc_tcp_ops = {
2466 .reserve_xprt = xprt_reserve_xprt,
2467 .release_xprt = xprt_release_xprt,
2468 .buf_alloc = bc_malloc,
2469 .buf_free = bc_free,
2470 .send_request = bc_send_request,
2471 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2472 .close = bc_close,
2473 .destroy = bc_destroy,
2474 .print_stats = xs_tcp_print_stats,
2475};
2476
2477static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2478{
2479 static const struct sockaddr_in sin = {
2480 .sin_family = AF_INET,
2481 .sin_addr.s_addr = htonl(INADDR_ANY),
2482 };
2483 static const struct sockaddr_in6 sin6 = {
2484 .sin6_family = AF_INET6,
2485 .sin6_addr = IN6ADDR_ANY_INIT,
2486 };
2487
2488 switch (family) {
2489 case AF_LOCAL:
2490 break;
2491 case AF_INET:
2492 memcpy(sap, &sin, sizeof(sin));
2493 break;
2494 case AF_INET6:
2495 memcpy(sap, &sin6, sizeof(sin6));
2496 break;
2497 default:
2498 dprintk("RPC: %s: Bad address family\n", __func__);
2499 return -EAFNOSUPPORT;
2500 }
2501 return 0;
2502}
2503
2504static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2505 unsigned int slot_table_size,
2506 unsigned int max_slot_table_size)
2507{
2508 struct rpc_xprt *xprt;
2509 struct sock_xprt *new;
2510
2511 if (args->addrlen > sizeof(xprt->addr)) {
2512 dprintk("RPC: xs_setup_xprt: address too large\n");
2513 return ERR_PTR(-EBADF);
2514 }
2515
2516 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2517 max_slot_table_size);
2518 if (xprt == NULL) {
2519 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2520 "rpc_xprt\n");
2521 return ERR_PTR(-ENOMEM);
2522 }
2523
2524 new = container_of(xprt, struct sock_xprt, xprt);
2525 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2526 xprt->addrlen = args->addrlen;
2527 if (args->srcaddr)
2528 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2529 else {
2530 int err;
2531 err = xs_init_anyaddr(args->dstaddr->sa_family,
2532 (struct sockaddr *)&new->srcaddr);
2533 if (err != 0)
2534 return ERR_PTR(err);
2535 }
2536
2537 return xprt;
2538}
2539
2540static const struct rpc_timeout xs_local_default_timeout = {
2541 .to_initval = 10 * HZ,
2542 .to_maxval = 10 * HZ,
2543 .to_retries = 2,
2544};
2545
2546/**
2547 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2548 * @args: rpc transport creation arguments
2549 *
2550 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2551 */
2552static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2553{
2554 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2555 struct sock_xprt *transport;
2556 struct rpc_xprt *xprt;
2557 struct rpc_xprt *ret;
2558
2559 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2560 xprt_max_tcp_slot_table_entries);
2561 if (IS_ERR(xprt))
2562 return xprt;
2563 transport = container_of(xprt, struct sock_xprt, xprt);
2564
2565 xprt->prot = 0;
2566 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2567 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2568
2569 xprt->bind_timeout = XS_BIND_TO;
2570 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2571 xprt->idle_timeout = XS_IDLE_DISC_TO;
2572
2573 xprt->ops = &xs_local_ops;
2574 xprt->timeout = &xs_local_default_timeout;
2575
2576 switch (sun->sun_family) {
2577 case AF_LOCAL:
2578 if (sun->sun_path[0] != '/') {
2579 dprintk("RPC: bad AF_LOCAL address: %s\n",
2580 sun->sun_path);
2581 ret = ERR_PTR(-EINVAL);
2582 goto out_err;
2583 }
2584 xprt_set_bound(xprt);
2585 INIT_DELAYED_WORK(&transport->connect_worker,
2586 xs_local_setup_socket);
2587 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2588 break;
2589 default:
2590 ret = ERR_PTR(-EAFNOSUPPORT);
2591 goto out_err;
2592 }
2593
2594 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2595 xprt->address_strings[RPC_DISPLAY_ADDR]);
2596
2597 if (try_module_get(THIS_MODULE))
2598 return xprt;
2599 ret = ERR_PTR(-EINVAL);
2600out_err:
2601 xprt_free(xprt);
2602 return ret;
2603}
2604
2605static const struct rpc_timeout xs_udp_default_timeout = {
2606 .to_initval = 5 * HZ,
2607 .to_maxval = 30 * HZ,
2608 .to_increment = 5 * HZ,
2609 .to_retries = 5,
2610};
2611
2612/**
2613 * xs_setup_udp - Set up transport to use a UDP socket
2614 * @args: rpc transport creation arguments
2615 *
2616 */
2617static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2618{
2619 struct sockaddr *addr = args->dstaddr;
2620 struct rpc_xprt *xprt;
2621 struct sock_xprt *transport;
2622 struct rpc_xprt *ret;
2623
2624 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2625 xprt_udp_slot_table_entries);
2626 if (IS_ERR(xprt))
2627 return xprt;
2628 transport = container_of(xprt, struct sock_xprt, xprt);
2629
2630 xprt->prot = IPPROTO_UDP;
2631 xprt->tsh_size = 0;
2632 /* XXX: header size can vary due to auth type, IPv6, etc. */
2633 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2634
2635 xprt->bind_timeout = XS_BIND_TO;
2636 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2637 xprt->idle_timeout = XS_IDLE_DISC_TO;
2638
2639 xprt->ops = &xs_udp_ops;
2640
2641 xprt->timeout = &xs_udp_default_timeout;
2642
2643 switch (addr->sa_family) {
2644 case AF_INET:
2645 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2646 xprt_set_bound(xprt);
2647
2648 INIT_DELAYED_WORK(&transport->connect_worker,
2649 xs_udp_setup_socket);
2650 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2651 break;
2652 case AF_INET6:
2653 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2654 xprt_set_bound(xprt);
2655
2656 INIT_DELAYED_WORK(&transport->connect_worker,
2657 xs_udp_setup_socket);
2658 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2659 break;
2660 default:
2661 ret = ERR_PTR(-EAFNOSUPPORT);
2662 goto out_err;
2663 }
2664
2665 if (xprt_bound(xprt))
2666 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2667 xprt->address_strings[RPC_DISPLAY_ADDR],
2668 xprt->address_strings[RPC_DISPLAY_PORT],
2669 xprt->address_strings[RPC_DISPLAY_PROTO]);
2670 else
2671 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2672 xprt->address_strings[RPC_DISPLAY_ADDR],
2673 xprt->address_strings[RPC_DISPLAY_PROTO]);
2674
2675 if (try_module_get(THIS_MODULE))
2676 return xprt;
2677 ret = ERR_PTR(-EINVAL);
2678out_err:
2679 xprt_free(xprt);
2680 return ret;
2681}
2682
2683static const struct rpc_timeout xs_tcp_default_timeout = {
2684 .to_initval = 60 * HZ,
2685 .to_maxval = 60 * HZ,
2686 .to_retries = 2,
2687};
2688
2689/**
2690 * xs_setup_tcp - Set up transport to use a TCP socket
2691 * @args: rpc transport creation arguments
2692 *
2693 */
2694static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2695{
2696 struct sockaddr *addr = args->dstaddr;
2697 struct rpc_xprt *xprt;
2698 struct sock_xprt *transport;
2699 struct rpc_xprt *ret;
2700
2701 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2702 xprt_max_tcp_slot_table_entries);
2703 if (IS_ERR(xprt))
2704 return xprt;
2705 transport = container_of(xprt, struct sock_xprt, xprt);
2706
2707 xprt->prot = IPPROTO_TCP;
2708 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2709 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2710
2711 xprt->bind_timeout = XS_BIND_TO;
2712 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2713 xprt->idle_timeout = XS_IDLE_DISC_TO;
2714
2715 xprt->ops = &xs_tcp_ops;
2716 xprt->timeout = &xs_tcp_default_timeout;
2717
2718 switch (addr->sa_family) {
2719 case AF_INET:
2720 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2721 xprt_set_bound(xprt);
2722
2723 INIT_DELAYED_WORK(&transport->connect_worker,
2724 xs_tcp_setup_socket);
2725 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2726 break;
2727 case AF_INET6:
2728 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2729 xprt_set_bound(xprt);
2730
2731 INIT_DELAYED_WORK(&transport->connect_worker,
2732 xs_tcp_setup_socket);
2733 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2734 break;
2735 default:
2736 ret = ERR_PTR(-EAFNOSUPPORT);
2737 goto out_err;
2738 }
2739
2740 if (xprt_bound(xprt))
2741 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2742 xprt->address_strings[RPC_DISPLAY_ADDR],
2743 xprt->address_strings[RPC_DISPLAY_PORT],
2744 xprt->address_strings[RPC_DISPLAY_PROTO]);
2745 else
2746 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2747 xprt->address_strings[RPC_DISPLAY_ADDR],
2748 xprt->address_strings[RPC_DISPLAY_PROTO]);
2749
2750
2751 if (try_module_get(THIS_MODULE))
2752 return xprt;
2753 ret = ERR_PTR(-EINVAL);
2754out_err:
2755 xprt_free(xprt);
2756 return ret;
2757}
2758
2759/**
2760 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2761 * @args: rpc transport creation arguments
2762 *
2763 */
2764static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2765{
2766 struct sockaddr *addr = args->dstaddr;
2767 struct rpc_xprt *xprt;
2768 struct sock_xprt *transport;
2769 struct svc_sock *bc_sock;
2770 struct rpc_xprt *ret;
2771
2772 if (args->bc_xprt->xpt_bc_xprt) {
2773 /*
2774 * This server connection already has a backchannel
2775 * export; we can't create a new one, as we wouldn't be
2776 * able to match replies based on xid any more. So,
2777 * reuse the already-existing one:
2778 */
2779 return args->bc_xprt->xpt_bc_xprt;
2780 }
2781 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2782 xprt_tcp_slot_table_entries);
2783 if (IS_ERR(xprt))
2784 return xprt;
2785 transport = container_of(xprt, struct sock_xprt, xprt);
2786
2787 xprt->prot = IPPROTO_TCP;
2788 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2789 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2790 xprt->timeout = &xs_tcp_default_timeout;
2791
2792 /* backchannel */
2793 xprt_set_bound(xprt);
2794 xprt->bind_timeout = 0;
2795 xprt->reestablish_timeout = 0;
2796 xprt->idle_timeout = 0;
2797
2798 xprt->ops = &bc_tcp_ops;
2799
2800 switch (addr->sa_family) {
2801 case AF_INET:
2802 xs_format_peer_addresses(xprt, "tcp",
2803 RPCBIND_NETID_TCP);
2804 break;
2805 case AF_INET6:
2806 xs_format_peer_addresses(xprt, "tcp",
2807 RPCBIND_NETID_TCP6);
2808 break;
2809 default:
2810 ret = ERR_PTR(-EAFNOSUPPORT);
2811 goto out_err;
2812 }
2813
2814 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2815 xprt->address_strings[RPC_DISPLAY_ADDR],
2816 xprt->address_strings[RPC_DISPLAY_PORT],
2817 xprt->address_strings[RPC_DISPLAY_PROTO]);
2818
2819 /*
2820 * Once we've associated a backchannel xprt with a connection,
2821 * we want to keep it around as long as long as the connection
2822 * lasts, in case we need to start using it for a backchannel
2823 * again; this reference won't be dropped until bc_xprt is
2824 * destroyed.
2825 */
2826 xprt_get(xprt);
2827 args->bc_xprt->xpt_bc_xprt = xprt;
2828 xprt->bc_xprt = args->bc_xprt;
2829 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2830 transport->sock = bc_sock->sk_sock;
2831 transport->inet = bc_sock->sk_sk;
2832
2833 /*
2834 * Since we don't want connections for the backchannel, we set
2835 * the xprt status to connected
2836 */
2837 xprt_set_connected(xprt);
2838
2839
2840 if (try_module_get(THIS_MODULE))
2841 return xprt;
2842 xprt_put(xprt);
2843 ret = ERR_PTR(-EINVAL);
2844out_err:
2845 xprt_free(xprt);
2846 return ret;
2847}
2848
2849static struct xprt_class xs_local_transport = {
2850 .list = LIST_HEAD_INIT(xs_local_transport.list),
2851 .name = "named UNIX socket",
2852 .owner = THIS_MODULE,
2853 .ident = XPRT_TRANSPORT_LOCAL,
2854 .setup = xs_setup_local,
2855};
2856
2857static struct xprt_class xs_udp_transport = {
2858 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2859 .name = "udp",
2860 .owner = THIS_MODULE,
2861 .ident = XPRT_TRANSPORT_UDP,
2862 .setup = xs_setup_udp,
2863};
2864
2865static struct xprt_class xs_tcp_transport = {
2866 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2867 .name = "tcp",
2868 .owner = THIS_MODULE,
2869 .ident = XPRT_TRANSPORT_TCP,
2870 .setup = xs_setup_tcp,
2871};
2872
2873static struct xprt_class xs_bc_tcp_transport = {
2874 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2875 .name = "tcp NFSv4.1 backchannel",
2876 .owner = THIS_MODULE,
2877 .ident = XPRT_TRANSPORT_BC_TCP,
2878 .setup = xs_setup_bc_tcp,
2879};
2880
2881/**
2882 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2883 *
2884 */
2885int init_socket_xprt(void)
2886{
2887#ifdef RPC_DEBUG
2888 if (!sunrpc_table_header)
2889 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2890#endif
2891
2892 xprt_register_transport(&xs_local_transport);
2893 xprt_register_transport(&xs_udp_transport);
2894 xprt_register_transport(&xs_tcp_transport);
2895 xprt_register_transport(&xs_bc_tcp_transport);
2896
2897 return 0;
2898}
2899
2900/**
2901 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2902 *
2903 */
2904void cleanup_socket_xprt(void)
2905{
2906#ifdef RPC_DEBUG
2907 if (sunrpc_table_header) {
2908 unregister_sysctl_table(sunrpc_table_header);
2909 sunrpc_table_header = NULL;
2910 }
2911#endif
2912
2913 xprt_unregister_transport(&xs_local_transport);
2914 xprt_unregister_transport(&xs_udp_transport);
2915 xprt_unregister_transport(&xs_tcp_transport);
2916 xprt_unregister_transport(&xs_bc_tcp_transport);
2917}
2918
2919static int param_set_uint_minmax(const char *val,
2920 const struct kernel_param *kp,
2921 unsigned int min, unsigned int max)
2922{
2923 unsigned long num;
2924 int ret;
2925
2926 if (!val)
2927 return -EINVAL;
2928 ret = strict_strtoul(val, 0, &num);
2929 if (ret == -EINVAL || num < min || num > max)
2930 return -EINVAL;
2931 *((unsigned int *)kp->arg) = num;
2932 return 0;
2933}
2934
2935static int param_set_portnr(const char *val, const struct kernel_param *kp)
2936{
2937 return param_set_uint_minmax(val, kp,
2938 RPC_MIN_RESVPORT,
2939 RPC_MAX_RESVPORT);
2940}
2941
2942static struct kernel_param_ops param_ops_portnr = {
2943 .set = param_set_portnr,
2944 .get = param_get_uint,
2945};
2946
2947#define param_check_portnr(name, p) \
2948 __param_check(name, p, unsigned int);
2949
2950module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2951module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2952
2953static int param_set_slot_table_size(const char *val,
2954 const struct kernel_param *kp)
2955{
2956 return param_set_uint_minmax(val, kp,
2957 RPC_MIN_SLOT_TABLE,
2958 RPC_MAX_SLOT_TABLE);
2959}
2960
2961static struct kernel_param_ops param_ops_slot_table_size = {
2962 .set = param_set_slot_table_size,
2963 .get = param_get_uint,
2964};
2965
2966#define param_check_slot_table_size(name, p) \
2967 __param_check(name, p, unsigned int);
2968
2969static int param_set_max_slot_table_size(const char *val,
2970 const struct kernel_param *kp)
2971{
2972 return param_set_uint_minmax(val, kp,
2973 RPC_MIN_SLOT_TABLE,
2974 RPC_MAX_SLOT_TABLE_LIMIT);
2975}
2976
2977static struct kernel_param_ops param_ops_max_slot_table_size = {
2978 .set = param_set_max_slot_table_size,
2979 .get = param_get_uint,
2980};
2981
2982#define param_check_max_slot_table_size(name, p) \
2983 __param_check(name, p, unsigned int);
2984
2985module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2986 slot_table_size, 0644);
2987module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
2988 max_slot_table_size, 0644);
2989module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2990 slot_table_size, 0644);
2991
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/net/sunrpc/xprtsock.c
4 *
5 * Client-side transport implementation for sockets.
6 *
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 *
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 *
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 *
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
20 */
21
22#include <linux/types.h>
23#include <linux/string.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/capability.h>
27#include <linux/pagemap.h>
28#include <linux/errno.h>
29#include <linux/socket.h>
30#include <linux/in.h>
31#include <linux/net.h>
32#include <linux/mm.h>
33#include <linux/un.h>
34#include <linux/udp.h>
35#include <linux/tcp.h>
36#include <linux/sunrpc/clnt.h>
37#include <linux/sunrpc/addr.h>
38#include <linux/sunrpc/sched.h>
39#include <linux/sunrpc/svcsock.h>
40#include <linux/sunrpc/xprtsock.h>
41#include <linux/file.h>
42#ifdef CONFIG_SUNRPC_BACKCHANNEL
43#include <linux/sunrpc/bc_xprt.h>
44#endif
45
46#include <net/sock.h>
47#include <net/checksum.h>
48#include <net/udp.h>
49#include <net/tcp.h>
50#include <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "socklib.h"
58#include "sunrpc.h"
59
60static void xs_close(struct rpc_xprt *xprt);
61static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
62static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
63 struct socket *sock);
64
65/*
66 * xprtsock tunables
67 */
68static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
69static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
70static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
71
72static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
73static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
74
75#define XS_TCP_LINGER_TO (15U * HZ)
76static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
77
78/*
79 * We can register our own files under /proc/sys/sunrpc by
80 * calling register_sysctl_table() again. The files in that
81 * directory become the union of all files registered there.
82 *
83 * We simply need to make sure that we don't collide with
84 * someone else's file names!
85 */
86
87static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
88static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
89static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
90static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
91static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
92
93static struct ctl_table_header *sunrpc_table_header;
94
95static struct xprt_class xs_local_transport;
96static struct xprt_class xs_udp_transport;
97static struct xprt_class xs_tcp_transport;
98static struct xprt_class xs_bc_tcp_transport;
99
100/*
101 * FIXME: changing the UDP slot table size should also resize the UDP
102 * socket buffers for existing UDP transports
103 */
104static struct ctl_table xs_tunables_table[] = {
105 {
106 .procname = "udp_slot_table_entries",
107 .data = &xprt_udp_slot_table_entries,
108 .maxlen = sizeof(unsigned int),
109 .mode = 0644,
110 .proc_handler = proc_dointvec_minmax,
111 .extra1 = &min_slot_table_size,
112 .extra2 = &max_slot_table_size
113 },
114 {
115 .procname = "tcp_slot_table_entries",
116 .data = &xprt_tcp_slot_table_entries,
117 .maxlen = sizeof(unsigned int),
118 .mode = 0644,
119 .proc_handler = proc_dointvec_minmax,
120 .extra1 = &min_slot_table_size,
121 .extra2 = &max_slot_table_size
122 },
123 {
124 .procname = "tcp_max_slot_table_entries",
125 .data = &xprt_max_tcp_slot_table_entries,
126 .maxlen = sizeof(unsigned int),
127 .mode = 0644,
128 .proc_handler = proc_dointvec_minmax,
129 .extra1 = &min_slot_table_size,
130 .extra2 = &max_tcp_slot_table_limit
131 },
132 {
133 .procname = "min_resvport",
134 .data = &xprt_min_resvport,
135 .maxlen = sizeof(unsigned int),
136 .mode = 0644,
137 .proc_handler = proc_dointvec_minmax,
138 .extra1 = &xprt_min_resvport_limit,
139 .extra2 = &xprt_max_resvport_limit
140 },
141 {
142 .procname = "max_resvport",
143 .data = &xprt_max_resvport,
144 .maxlen = sizeof(unsigned int),
145 .mode = 0644,
146 .proc_handler = proc_dointvec_minmax,
147 .extra1 = &xprt_min_resvport_limit,
148 .extra2 = &xprt_max_resvport_limit
149 },
150 {
151 .procname = "tcp_fin_timeout",
152 .data = &xs_tcp_fin_timeout,
153 .maxlen = sizeof(xs_tcp_fin_timeout),
154 .mode = 0644,
155 .proc_handler = proc_dointvec_jiffies,
156 },
157 { },
158};
159
160static struct ctl_table sunrpc_table[] = {
161 {
162 .procname = "sunrpc",
163 .mode = 0555,
164 .child = xs_tunables_table
165 },
166 { },
167};
168
169/*
170 * Wait duration for a reply from the RPC portmapper.
171 */
172#define XS_BIND_TO (60U * HZ)
173
174/*
175 * Delay if a UDP socket connect error occurs. This is most likely some
176 * kind of resource problem on the local host.
177 */
178#define XS_UDP_REEST_TO (2U * HZ)
179
180/*
181 * The reestablish timeout allows clients to delay for a bit before attempting
182 * to reconnect to a server that just dropped our connection.
183 *
184 * We implement an exponential backoff when trying to reestablish a TCP
185 * transport connection with the server. Some servers like to drop a TCP
186 * connection when they are overworked, so we start with a short timeout and
187 * increase over time if the server is down or not responding.
188 */
189#define XS_TCP_INIT_REEST_TO (3U * HZ)
190
191/*
192 * TCP idle timeout; client drops the transport socket if it is idle
193 * for this long. Note that we also timeout UDP sockets to prevent
194 * holding port numbers when there is no RPC traffic.
195 */
196#define XS_IDLE_DISC_TO (5U * 60 * HZ)
197
198#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
199# undef RPC_DEBUG_DATA
200# define RPCDBG_FACILITY RPCDBG_TRANS
201#endif
202
203#ifdef RPC_DEBUG_DATA
204static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
205{
206 u8 *buf = (u8 *) packet;
207 int j;
208
209 dprintk("RPC: %s\n", msg);
210 for (j = 0; j < count && j < 128; j += 4) {
211 if (!(j & 31)) {
212 if (j)
213 dprintk("\n");
214 dprintk("0x%04x ", j);
215 }
216 dprintk("%02x%02x%02x%02x ",
217 buf[j], buf[j+1], buf[j+2], buf[j+3]);
218 }
219 dprintk("\n");
220}
221#else
222static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
223{
224 /* NOP */
225}
226#endif
227
228static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
229{
230 return (struct rpc_xprt *) sk->sk_user_data;
231}
232
233static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
234{
235 return (struct sockaddr *) &xprt->addr;
236}
237
238static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
239{
240 return (struct sockaddr_un *) &xprt->addr;
241}
242
243static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
244{
245 return (struct sockaddr_in *) &xprt->addr;
246}
247
248static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
249{
250 return (struct sockaddr_in6 *) &xprt->addr;
251}
252
253static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
254{
255 struct sockaddr *sap = xs_addr(xprt);
256 struct sockaddr_in6 *sin6;
257 struct sockaddr_in *sin;
258 struct sockaddr_un *sun;
259 char buf[128];
260
261 switch (sap->sa_family) {
262 case AF_LOCAL:
263 sun = xs_addr_un(xprt);
264 strscpy(buf, sun->sun_path, sizeof(buf));
265 xprt->address_strings[RPC_DISPLAY_ADDR] =
266 kstrdup(buf, GFP_KERNEL);
267 break;
268 case AF_INET:
269 (void)rpc_ntop(sap, buf, sizeof(buf));
270 xprt->address_strings[RPC_DISPLAY_ADDR] =
271 kstrdup(buf, GFP_KERNEL);
272 sin = xs_addr_in(xprt);
273 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
274 break;
275 case AF_INET6:
276 (void)rpc_ntop(sap, buf, sizeof(buf));
277 xprt->address_strings[RPC_DISPLAY_ADDR] =
278 kstrdup(buf, GFP_KERNEL);
279 sin6 = xs_addr_in6(xprt);
280 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
281 break;
282 default:
283 BUG();
284 }
285
286 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
287}
288
289static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
290{
291 struct sockaddr *sap = xs_addr(xprt);
292 char buf[128];
293
294 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
295 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
296
297 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
298 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
299}
300
301static void xs_format_peer_addresses(struct rpc_xprt *xprt,
302 const char *protocol,
303 const char *netid)
304{
305 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
306 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
307 xs_format_common_peer_addresses(xprt);
308 xs_format_common_peer_ports(xprt);
309}
310
311static void xs_update_peer_port(struct rpc_xprt *xprt)
312{
313 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
314 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
315
316 xs_format_common_peer_ports(xprt);
317}
318
319static void xs_free_peer_addresses(struct rpc_xprt *xprt)
320{
321 unsigned int i;
322
323 for (i = 0; i < RPC_DISPLAY_MAX; i++)
324 switch (i) {
325 case RPC_DISPLAY_PROTO:
326 case RPC_DISPLAY_NETID:
327 continue;
328 default:
329 kfree(xprt->address_strings[i]);
330 }
331}
332
333static size_t
334xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
335{
336 size_t i,n;
337
338 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
339 return want;
340 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
341 for (i = 0; i < n; i++) {
342 if (buf->pages[i])
343 continue;
344 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
345 if (!buf->pages[i]) {
346 i *= PAGE_SIZE;
347 return i > buf->page_base ? i - buf->page_base : 0;
348 }
349 }
350 return want;
351}
352
353static ssize_t
354xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
355{
356 ssize_t ret;
357 if (seek != 0)
358 iov_iter_advance(&msg->msg_iter, seek);
359 ret = sock_recvmsg(sock, msg, flags);
360 return ret > 0 ? ret + seek : ret;
361}
362
363static ssize_t
364xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
365 struct kvec *kvec, size_t count, size_t seek)
366{
367 iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
368 return xs_sock_recvmsg(sock, msg, flags, seek);
369}
370
371static ssize_t
372xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
373 struct bio_vec *bvec, unsigned long nr, size_t count,
374 size_t seek)
375{
376 iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
377 return xs_sock_recvmsg(sock, msg, flags, seek);
378}
379
380static ssize_t
381xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
382 size_t count)
383{
384 iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
385 return sock_recvmsg(sock, msg, flags);
386}
387
388#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
389static void
390xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
391{
392 struct bvec_iter bi = {
393 .bi_size = count,
394 };
395 struct bio_vec bv;
396
397 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
398 for_each_bvec(bv, bvec, bi, bi)
399 flush_dcache_page(bv.bv_page);
400}
401#else
402static inline void
403xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
404{
405}
406#endif
407
408static ssize_t
409xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
410 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
411{
412 size_t want, seek_init = seek, offset = 0;
413 ssize_t ret;
414
415 want = min_t(size_t, count, buf->head[0].iov_len);
416 if (seek < want) {
417 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
418 if (ret <= 0)
419 goto sock_err;
420 offset += ret;
421 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
422 goto out;
423 if (ret != want)
424 goto out;
425 seek = 0;
426 } else {
427 seek -= want;
428 offset += want;
429 }
430
431 want = xs_alloc_sparse_pages(
432 buf, min_t(size_t, count - offset, buf->page_len),
433 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
434 if (seek < want) {
435 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
436 xdr_buf_pagecount(buf),
437 want + buf->page_base,
438 seek + buf->page_base);
439 if (ret <= 0)
440 goto sock_err;
441 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
442 ret -= buf->page_base;
443 offset += ret;
444 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
445 goto out;
446 if (ret != want)
447 goto out;
448 seek = 0;
449 } else {
450 seek -= want;
451 offset += want;
452 }
453
454 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
455 if (seek < want) {
456 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
457 if (ret <= 0)
458 goto sock_err;
459 offset += ret;
460 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
461 goto out;
462 if (ret != want)
463 goto out;
464 } else if (offset < seek_init)
465 offset = seek_init;
466 ret = -EMSGSIZE;
467out:
468 *read = offset - seek_init;
469 return ret;
470sock_err:
471 offset += seek;
472 goto out;
473}
474
475static void
476xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
477{
478 if (!transport->recv.copied) {
479 if (buf->head[0].iov_len >= transport->recv.offset)
480 memcpy(buf->head[0].iov_base,
481 &transport->recv.xid,
482 transport->recv.offset);
483 transport->recv.copied = transport->recv.offset;
484 }
485}
486
487static bool
488xs_read_stream_request_done(struct sock_xprt *transport)
489{
490 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
491}
492
493static void
494xs_read_stream_check_eor(struct sock_xprt *transport,
495 struct msghdr *msg)
496{
497 if (xs_read_stream_request_done(transport))
498 msg->msg_flags |= MSG_EOR;
499}
500
501static ssize_t
502xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
503 int flags, struct rpc_rqst *req)
504{
505 struct xdr_buf *buf = &req->rq_private_buf;
506 size_t want, read;
507 ssize_t ret;
508
509 xs_read_header(transport, buf);
510
511 want = transport->recv.len - transport->recv.offset;
512 if (want != 0) {
513 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
514 transport->recv.copied + want,
515 transport->recv.copied,
516 &read);
517 transport->recv.offset += read;
518 transport->recv.copied += read;
519 }
520
521 if (transport->recv.offset == transport->recv.len)
522 xs_read_stream_check_eor(transport, msg);
523
524 if (want == 0)
525 return 0;
526
527 switch (ret) {
528 default:
529 break;
530 case -EFAULT:
531 case -EMSGSIZE:
532 msg->msg_flags |= MSG_TRUNC;
533 return read;
534 case 0:
535 return -ESHUTDOWN;
536 }
537 return ret < 0 ? ret : read;
538}
539
540static size_t
541xs_read_stream_headersize(bool isfrag)
542{
543 if (isfrag)
544 return sizeof(__be32);
545 return 3 * sizeof(__be32);
546}
547
548static ssize_t
549xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
550 int flags, size_t want, size_t seek)
551{
552 struct kvec kvec = {
553 .iov_base = &transport->recv.fraghdr,
554 .iov_len = want,
555 };
556 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
557}
558
559#if defined(CONFIG_SUNRPC_BACKCHANNEL)
560static ssize_t
561xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
562{
563 struct rpc_xprt *xprt = &transport->xprt;
564 struct rpc_rqst *req;
565 ssize_t ret;
566
567 /* Is this transport associated with the backchannel? */
568 if (!xprt->bc_serv)
569 return -ESHUTDOWN;
570
571 /* Look up and lock the request corresponding to the given XID */
572 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
573 if (!req) {
574 printk(KERN_WARNING "Callback slot table overflowed\n");
575 return -ESHUTDOWN;
576 }
577 if (transport->recv.copied && !req->rq_private_buf.len)
578 return -ESHUTDOWN;
579
580 ret = xs_read_stream_request(transport, msg, flags, req);
581 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
582 xprt_complete_bc_request(req, transport->recv.copied);
583 else
584 req->rq_private_buf.len = transport->recv.copied;
585
586 return ret;
587}
588#else /* CONFIG_SUNRPC_BACKCHANNEL */
589static ssize_t
590xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
591{
592 return -ESHUTDOWN;
593}
594#endif /* CONFIG_SUNRPC_BACKCHANNEL */
595
596static ssize_t
597xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
598{
599 struct rpc_xprt *xprt = &transport->xprt;
600 struct rpc_rqst *req;
601 ssize_t ret = 0;
602
603 /* Look up and lock the request corresponding to the given XID */
604 spin_lock(&xprt->queue_lock);
605 req = xprt_lookup_rqst(xprt, transport->recv.xid);
606 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
607 msg->msg_flags |= MSG_TRUNC;
608 goto out;
609 }
610 xprt_pin_rqst(req);
611 spin_unlock(&xprt->queue_lock);
612
613 ret = xs_read_stream_request(transport, msg, flags, req);
614
615 spin_lock(&xprt->queue_lock);
616 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
617 xprt_complete_rqst(req->rq_task, transport->recv.copied);
618 else
619 req->rq_private_buf.len = transport->recv.copied;
620 xprt_unpin_rqst(req);
621out:
622 spin_unlock(&xprt->queue_lock);
623 return ret;
624}
625
626static ssize_t
627xs_read_stream(struct sock_xprt *transport, int flags)
628{
629 struct msghdr msg = { 0 };
630 size_t want, read = 0;
631 ssize_t ret = 0;
632
633 if (transport->recv.len == 0) {
634 want = xs_read_stream_headersize(transport->recv.copied != 0);
635 ret = xs_read_stream_header(transport, &msg, flags, want,
636 transport->recv.offset);
637 if (ret <= 0)
638 goto out_err;
639 transport->recv.offset = ret;
640 if (transport->recv.offset != want)
641 return transport->recv.offset;
642 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
643 RPC_FRAGMENT_SIZE_MASK;
644 transport->recv.offset -= sizeof(transport->recv.fraghdr);
645 read = ret;
646 }
647
648 switch (be32_to_cpu(transport->recv.calldir)) {
649 default:
650 msg.msg_flags |= MSG_TRUNC;
651 break;
652 case RPC_CALL:
653 ret = xs_read_stream_call(transport, &msg, flags);
654 break;
655 case RPC_REPLY:
656 ret = xs_read_stream_reply(transport, &msg, flags);
657 }
658 if (msg.msg_flags & MSG_TRUNC) {
659 transport->recv.calldir = cpu_to_be32(-1);
660 transport->recv.copied = -1;
661 }
662 if (ret < 0)
663 goto out_err;
664 read += ret;
665 if (transport->recv.offset < transport->recv.len) {
666 if (!(msg.msg_flags & MSG_TRUNC))
667 return read;
668 msg.msg_flags = 0;
669 ret = xs_read_discard(transport->sock, &msg, flags,
670 transport->recv.len - transport->recv.offset);
671 if (ret <= 0)
672 goto out_err;
673 transport->recv.offset += ret;
674 read += ret;
675 if (transport->recv.offset != transport->recv.len)
676 return read;
677 }
678 if (xs_read_stream_request_done(transport)) {
679 trace_xs_stream_read_request(transport);
680 transport->recv.copied = 0;
681 }
682 transport->recv.offset = 0;
683 transport->recv.len = 0;
684 return read;
685out_err:
686 return ret != 0 ? ret : -ESHUTDOWN;
687}
688
689static __poll_t xs_poll_socket(struct sock_xprt *transport)
690{
691 return transport->sock->ops->poll(transport->file, transport->sock,
692 NULL);
693}
694
695static bool xs_poll_socket_readable(struct sock_xprt *transport)
696{
697 __poll_t events = xs_poll_socket(transport);
698
699 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
700}
701
702static void xs_poll_check_readable(struct sock_xprt *transport)
703{
704
705 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
706 if (!xs_poll_socket_readable(transport))
707 return;
708 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
709 queue_work(xprtiod_workqueue, &transport->recv_worker);
710}
711
712static void xs_stream_data_receive(struct sock_xprt *transport)
713{
714 size_t read = 0;
715 ssize_t ret = 0;
716
717 mutex_lock(&transport->recv_mutex);
718 if (transport->sock == NULL)
719 goto out;
720 for (;;) {
721 ret = xs_read_stream(transport, MSG_DONTWAIT);
722 if (ret < 0)
723 break;
724 read += ret;
725 cond_resched();
726 }
727 if (ret == -ESHUTDOWN)
728 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
729 else
730 xs_poll_check_readable(transport);
731out:
732 mutex_unlock(&transport->recv_mutex);
733 trace_xs_stream_read_data(&transport->xprt, ret, read);
734}
735
736static void xs_stream_data_receive_workfn(struct work_struct *work)
737{
738 struct sock_xprt *transport =
739 container_of(work, struct sock_xprt, recv_worker);
740 unsigned int pflags = memalloc_nofs_save();
741
742 xs_stream_data_receive(transport);
743 memalloc_nofs_restore(pflags);
744}
745
746static void
747xs_stream_reset_connect(struct sock_xprt *transport)
748{
749 transport->recv.offset = 0;
750 transport->recv.len = 0;
751 transport->recv.copied = 0;
752 transport->xmit.offset = 0;
753}
754
755static void
756xs_stream_start_connect(struct sock_xprt *transport)
757{
758 transport->xprt.stat.connect_count++;
759 transport->xprt.stat.connect_start = jiffies;
760}
761
762#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
763
764/**
765 * xs_nospace - handle transmit was incomplete
766 * @req: pointer to RPC request
767 * @transport: pointer to struct sock_xprt
768 *
769 */
770static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
771{
772 struct rpc_xprt *xprt = &transport->xprt;
773 struct sock *sk = transport->inet;
774 int ret = -EAGAIN;
775
776 trace_rpc_socket_nospace(req, transport);
777
778 /* Protect against races with write_space */
779 spin_lock(&xprt->transport_lock);
780
781 /* Don't race with disconnect */
782 if (xprt_connected(xprt)) {
783 /* wait for more buffer space */
784 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
785 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
786 sk->sk_write_pending++;
787 xprt_wait_for_buffer_space(xprt);
788 } else
789 ret = -ENOTCONN;
790
791 spin_unlock(&xprt->transport_lock);
792 return ret;
793}
794
795static int xs_sock_nospace(struct rpc_rqst *req)
796{
797 struct sock_xprt *transport =
798 container_of(req->rq_xprt, struct sock_xprt, xprt);
799 struct sock *sk = transport->inet;
800 int ret = -EAGAIN;
801
802 lock_sock(sk);
803 if (!sock_writeable(sk))
804 ret = xs_nospace(req, transport);
805 release_sock(sk);
806 return ret;
807}
808
809static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
810{
811 struct sock_xprt *transport =
812 container_of(req->rq_xprt, struct sock_xprt, xprt);
813 struct sock *sk = transport->inet;
814 int ret = -EAGAIN;
815
816 if (vm_wait)
817 return -ENOBUFS;
818 lock_sock(sk);
819 if (!sk_stream_memory_free(sk))
820 ret = xs_nospace(req, transport);
821 release_sock(sk);
822 return ret;
823}
824
825static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
826{
827 return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
828}
829
830/*
831 * Determine if the previous message in the stream was aborted before it
832 * could complete transmission.
833 */
834static bool
835xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
836{
837 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
838}
839
840/*
841 * Return the stream record marker field for a record of length < 2^31-1
842 */
843static rpc_fraghdr
844xs_stream_record_marker(struct xdr_buf *xdr)
845{
846 if (!xdr->len)
847 return 0;
848 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
849}
850
851/**
852 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
853 * @req: pointer to RPC request
854 *
855 * Return values:
856 * 0: The request has been sent
857 * EAGAIN: The socket was blocked, please call again later to
858 * complete the request
859 * ENOTCONN: Caller needs to invoke connect logic then call again
860 * other: Some other error occurred, the request was not sent
861 */
862static int xs_local_send_request(struct rpc_rqst *req)
863{
864 struct rpc_xprt *xprt = req->rq_xprt;
865 struct sock_xprt *transport =
866 container_of(xprt, struct sock_xprt, xprt);
867 struct xdr_buf *xdr = &req->rq_snd_buf;
868 rpc_fraghdr rm = xs_stream_record_marker(xdr);
869 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
870 struct msghdr msg = {
871 .msg_flags = XS_SENDMSG_FLAGS,
872 };
873 bool vm_wait;
874 unsigned int sent;
875 int status;
876
877 /* Close the stream if the previous transmission was incomplete */
878 if (xs_send_request_was_aborted(transport, req)) {
879 xprt_force_disconnect(xprt);
880 return -ENOTCONN;
881 }
882
883 xs_pktdump("packet data:",
884 req->rq_svec->iov_base, req->rq_svec->iov_len);
885
886 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
887
888 req->rq_xtime = ktime_get();
889 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
890 transport->xmit.offset, rm, &sent);
891 dprintk("RPC: %s(%u) = %d\n",
892 __func__, xdr->len - transport->xmit.offset, status);
893
894 if (likely(sent > 0) || status == 0) {
895 transport->xmit.offset += sent;
896 req->rq_bytes_sent = transport->xmit.offset;
897 if (likely(req->rq_bytes_sent >= msglen)) {
898 req->rq_xmit_bytes_sent += transport->xmit.offset;
899 transport->xmit.offset = 0;
900 return 0;
901 }
902 status = -EAGAIN;
903 vm_wait = false;
904 }
905
906 switch (status) {
907 case -EAGAIN:
908 status = xs_stream_nospace(req, vm_wait);
909 break;
910 default:
911 dprintk("RPC: sendmsg returned unrecognized error %d\n",
912 -status);
913 fallthrough;
914 case -EPIPE:
915 xprt_force_disconnect(xprt);
916 status = -ENOTCONN;
917 }
918
919 return status;
920}
921
922/**
923 * xs_udp_send_request - write an RPC request to a UDP socket
924 * @req: pointer to RPC request
925 *
926 * Return values:
927 * 0: The request has been sent
928 * EAGAIN: The socket was blocked, please call again later to
929 * complete the request
930 * ENOTCONN: Caller needs to invoke connect logic then call again
931 * other: Some other error occurred, the request was not sent
932 */
933static int xs_udp_send_request(struct rpc_rqst *req)
934{
935 struct rpc_xprt *xprt = req->rq_xprt;
936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
937 struct xdr_buf *xdr = &req->rq_snd_buf;
938 struct msghdr msg = {
939 .msg_name = xs_addr(xprt),
940 .msg_namelen = xprt->addrlen,
941 .msg_flags = XS_SENDMSG_FLAGS,
942 };
943 unsigned int sent;
944 int status;
945
946 xs_pktdump("packet data:",
947 req->rq_svec->iov_base,
948 req->rq_svec->iov_len);
949
950 if (!xprt_bound(xprt))
951 return -ENOTCONN;
952
953 if (!xprt_request_get_cong(xprt, req))
954 return -EBADSLT;
955
956 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
957 if (status < 0)
958 return status;
959 req->rq_xtime = ktime_get();
960 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
961
962 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
963 xdr->len, status);
964
965 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
966 if (status == -EPERM)
967 goto process_status;
968
969 if (status == -EAGAIN && sock_writeable(transport->inet))
970 status = -ENOBUFS;
971
972 if (sent > 0 || status == 0) {
973 req->rq_xmit_bytes_sent += sent;
974 if (sent >= req->rq_slen)
975 return 0;
976 /* Still some bytes left; set up for a retry later. */
977 status = -EAGAIN;
978 }
979
980process_status:
981 switch (status) {
982 case -ENOTSOCK:
983 status = -ENOTCONN;
984 /* Should we call xs_close() here? */
985 break;
986 case -EAGAIN:
987 status = xs_sock_nospace(req);
988 break;
989 case -ENETUNREACH:
990 case -ENOBUFS:
991 case -EPIPE:
992 case -ECONNREFUSED:
993 case -EPERM:
994 /* When the server has died, an ICMP port unreachable message
995 * prompts ECONNREFUSED. */
996 break;
997 default:
998 dprintk("RPC: sendmsg returned unrecognized error %d\n",
999 -status);
1000 }
1001
1002 return status;
1003}
1004
1005/**
1006 * xs_tcp_send_request - write an RPC request to a TCP socket
1007 * @req: pointer to RPC request
1008 *
1009 * Return values:
1010 * 0: The request has been sent
1011 * EAGAIN: The socket was blocked, please call again later to
1012 * complete the request
1013 * ENOTCONN: Caller needs to invoke connect logic then call again
1014 * other: Some other error occurred, the request was not sent
1015 *
1016 * XXX: In the case of soft timeouts, should we eventually give up
1017 * if sendmsg is not able to make progress?
1018 */
1019static int xs_tcp_send_request(struct rpc_rqst *req)
1020{
1021 struct rpc_xprt *xprt = req->rq_xprt;
1022 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1023 struct xdr_buf *xdr = &req->rq_snd_buf;
1024 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1025 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1026 struct msghdr msg = {
1027 .msg_flags = XS_SENDMSG_FLAGS,
1028 };
1029 bool vm_wait;
1030 unsigned int sent;
1031 int status;
1032
1033 /* Close the stream if the previous transmission was incomplete */
1034 if (xs_send_request_was_aborted(transport, req)) {
1035 if (transport->sock != NULL)
1036 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1037 return -ENOTCONN;
1038 }
1039 if (!transport->inet)
1040 return -ENOTCONN;
1041
1042 xs_pktdump("packet data:",
1043 req->rq_svec->iov_base,
1044 req->rq_svec->iov_len);
1045
1046 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1047 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1048
1049 xs_set_srcport(transport, transport->sock);
1050
1051 /* Continue transmitting the packet/record. We must be careful
1052 * to cope with writespace callbacks arriving _after_ we have
1053 * called sendmsg(). */
1054 req->rq_xtime = ktime_get();
1055 tcp_sock_set_cork(transport->inet, true);
1056
1057 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1058
1059 do {
1060 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1061 transport->xmit.offset, rm, &sent);
1062
1063 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1064 xdr->len - transport->xmit.offset, status);
1065
1066 /* If we've sent the entire packet, immediately
1067 * reset the count of bytes sent. */
1068 transport->xmit.offset += sent;
1069 req->rq_bytes_sent = transport->xmit.offset;
1070 if (likely(req->rq_bytes_sent >= msglen)) {
1071 req->rq_xmit_bytes_sent += transport->xmit.offset;
1072 transport->xmit.offset = 0;
1073 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1074 tcp_sock_set_cork(transport->inet, false);
1075 return 0;
1076 }
1077
1078 WARN_ON_ONCE(sent == 0 && status == 0);
1079
1080 if (sent > 0)
1081 vm_wait = false;
1082
1083 } while (status == 0);
1084
1085 switch (status) {
1086 case -ENOTSOCK:
1087 status = -ENOTCONN;
1088 /* Should we call xs_close() here? */
1089 break;
1090 case -EAGAIN:
1091 status = xs_stream_nospace(req, vm_wait);
1092 break;
1093 case -ECONNRESET:
1094 case -ECONNREFUSED:
1095 case -ENOTCONN:
1096 case -EADDRINUSE:
1097 case -ENOBUFS:
1098 case -EPIPE:
1099 break;
1100 default:
1101 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1102 -status);
1103 }
1104
1105 return status;
1106}
1107
1108static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1109{
1110 transport->old_data_ready = sk->sk_data_ready;
1111 transport->old_state_change = sk->sk_state_change;
1112 transport->old_write_space = sk->sk_write_space;
1113 transport->old_error_report = sk->sk_error_report;
1114}
1115
1116static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1117{
1118 sk->sk_data_ready = transport->old_data_ready;
1119 sk->sk_state_change = transport->old_state_change;
1120 sk->sk_write_space = transport->old_write_space;
1121 sk->sk_error_report = transport->old_error_report;
1122}
1123
1124static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1125{
1126 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1127
1128 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1129 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1130 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1131 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1132 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1133}
1134
1135static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1136{
1137 set_bit(nr, &transport->sock_state);
1138 queue_work(xprtiod_workqueue, &transport->error_worker);
1139}
1140
1141static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1142{
1143 xprt->connect_cookie++;
1144 smp_mb__before_atomic();
1145 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1146 clear_bit(XPRT_CLOSING, &xprt->state);
1147 xs_sock_reset_state_flags(xprt);
1148 smp_mb__after_atomic();
1149}
1150
1151/**
1152 * xs_error_report - callback to handle TCP socket state errors
1153 * @sk: socket
1154 *
1155 * Note: we don't call sock_error() since there may be a rpc_task
1156 * using the socket, and so we don't want to clear sk->sk_err.
1157 */
1158static void xs_error_report(struct sock *sk)
1159{
1160 struct sock_xprt *transport;
1161 struct rpc_xprt *xprt;
1162
1163 if (!(xprt = xprt_from_sock(sk)))
1164 return;
1165
1166 transport = container_of(xprt, struct sock_xprt, xprt);
1167 transport->xprt_err = -sk->sk_err;
1168 if (transport->xprt_err == 0)
1169 return;
1170 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1171 xprt, -transport->xprt_err);
1172 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1173
1174 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1175 smp_mb__before_atomic();
1176 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1177}
1178
1179static void xs_reset_transport(struct sock_xprt *transport)
1180{
1181 struct socket *sock = transport->sock;
1182 struct sock *sk = transport->inet;
1183 struct rpc_xprt *xprt = &transport->xprt;
1184 struct file *filp = transport->file;
1185
1186 if (sk == NULL)
1187 return;
1188 /*
1189 * Make sure we're calling this in a context from which it is safe
1190 * to call __fput_sync(). In practice that means rpciod and the
1191 * system workqueue.
1192 */
1193 if (!(current->flags & PF_WQ_WORKER)) {
1194 WARN_ON_ONCE(1);
1195 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1196 return;
1197 }
1198
1199 if (atomic_read(&transport->xprt.swapper))
1200 sk_clear_memalloc(sk);
1201
1202 kernel_sock_shutdown(sock, SHUT_RDWR);
1203
1204 mutex_lock(&transport->recv_mutex);
1205 lock_sock(sk);
1206 transport->inet = NULL;
1207 transport->sock = NULL;
1208 transport->file = NULL;
1209
1210 sk->sk_user_data = NULL;
1211
1212 xs_restore_old_callbacks(transport, sk);
1213 xprt_clear_connected(xprt);
1214 xs_sock_reset_connection_flags(xprt);
1215 /* Reset stream record info */
1216 xs_stream_reset_connect(transport);
1217 release_sock(sk);
1218 mutex_unlock(&transport->recv_mutex);
1219
1220 trace_rpc_socket_close(xprt, sock);
1221 __fput_sync(filp);
1222
1223 xprt_disconnect_done(xprt);
1224}
1225
1226/**
1227 * xs_close - close a socket
1228 * @xprt: transport
1229 *
1230 * This is used when all requests are complete; ie, no DRC state remains
1231 * on the server we want to save.
1232 *
1233 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1234 * xs_reset_transport() zeroing the socket from underneath a writer.
1235 */
1236static void xs_close(struct rpc_xprt *xprt)
1237{
1238 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1239
1240 dprintk("RPC: xs_close xprt %p\n", xprt);
1241
1242 xs_reset_transport(transport);
1243 xprt->reestablish_timeout = 0;
1244}
1245
1246static void xs_inject_disconnect(struct rpc_xprt *xprt)
1247{
1248 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1249 xprt);
1250 xprt_disconnect_done(xprt);
1251}
1252
1253static void xs_xprt_free(struct rpc_xprt *xprt)
1254{
1255 xs_free_peer_addresses(xprt);
1256 xprt_free(xprt);
1257}
1258
1259/**
1260 * xs_destroy - prepare to shutdown a transport
1261 * @xprt: doomed transport
1262 *
1263 */
1264static void xs_destroy(struct rpc_xprt *xprt)
1265{
1266 struct sock_xprt *transport = container_of(xprt,
1267 struct sock_xprt, xprt);
1268 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1269
1270 cancel_delayed_work_sync(&transport->connect_worker);
1271 xs_close(xprt);
1272 cancel_work_sync(&transport->recv_worker);
1273 cancel_work_sync(&transport->error_worker);
1274 xs_xprt_free(xprt);
1275 module_put(THIS_MODULE);
1276}
1277
1278/**
1279 * xs_udp_data_read_skb - receive callback for UDP sockets
1280 * @xprt: transport
1281 * @sk: socket
1282 * @skb: skbuff
1283 *
1284 */
1285static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1286 struct sock *sk,
1287 struct sk_buff *skb)
1288{
1289 struct rpc_task *task;
1290 struct rpc_rqst *rovr;
1291 int repsize, copied;
1292 u32 _xid;
1293 __be32 *xp;
1294
1295 repsize = skb->len;
1296 if (repsize < 4) {
1297 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1298 return;
1299 }
1300
1301 /* Copy the XID from the skb... */
1302 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1303 if (xp == NULL)
1304 return;
1305
1306 /* Look up and lock the request corresponding to the given XID */
1307 spin_lock(&xprt->queue_lock);
1308 rovr = xprt_lookup_rqst(xprt, *xp);
1309 if (!rovr)
1310 goto out_unlock;
1311 xprt_pin_rqst(rovr);
1312 xprt_update_rtt(rovr->rq_task);
1313 spin_unlock(&xprt->queue_lock);
1314 task = rovr->rq_task;
1315
1316 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1317 copied = repsize;
1318
1319 /* Suck it into the iovec, verify checksum if not done by hw. */
1320 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1321 spin_lock(&xprt->queue_lock);
1322 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1323 goto out_unpin;
1324 }
1325
1326
1327 spin_lock(&xprt->transport_lock);
1328 xprt_adjust_cwnd(xprt, task, copied);
1329 spin_unlock(&xprt->transport_lock);
1330 spin_lock(&xprt->queue_lock);
1331 xprt_complete_rqst(task, copied);
1332 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1333out_unpin:
1334 xprt_unpin_rqst(rovr);
1335 out_unlock:
1336 spin_unlock(&xprt->queue_lock);
1337}
1338
1339static void xs_udp_data_receive(struct sock_xprt *transport)
1340{
1341 struct sk_buff *skb;
1342 struct sock *sk;
1343 int err;
1344
1345 mutex_lock(&transport->recv_mutex);
1346 sk = transport->inet;
1347 if (sk == NULL)
1348 goto out;
1349 for (;;) {
1350 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1351 if (skb == NULL)
1352 break;
1353 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1354 consume_skb(skb);
1355 cond_resched();
1356 }
1357 xs_poll_check_readable(transport);
1358out:
1359 mutex_unlock(&transport->recv_mutex);
1360}
1361
1362static void xs_udp_data_receive_workfn(struct work_struct *work)
1363{
1364 struct sock_xprt *transport =
1365 container_of(work, struct sock_xprt, recv_worker);
1366 unsigned int pflags = memalloc_nofs_save();
1367
1368 xs_udp_data_receive(transport);
1369 memalloc_nofs_restore(pflags);
1370}
1371
1372/**
1373 * xs_data_ready - "data ready" callback for sockets
1374 * @sk: socket with data to read
1375 *
1376 */
1377static void xs_data_ready(struct sock *sk)
1378{
1379 struct rpc_xprt *xprt;
1380
1381 xprt = xprt_from_sock(sk);
1382 if (xprt != NULL) {
1383 struct sock_xprt *transport = container_of(xprt,
1384 struct sock_xprt, xprt);
1385
1386 trace_xs_data_ready(xprt);
1387
1388 transport->old_data_ready(sk);
1389 /* Any data means we had a useful conversation, so
1390 * then we don't need to delay the next reconnect
1391 */
1392 if (xprt->reestablish_timeout)
1393 xprt->reestablish_timeout = 0;
1394 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1395 queue_work(xprtiod_workqueue, &transport->recv_worker);
1396 }
1397}
1398
1399/*
1400 * Helper function to force a TCP close if the server is sending
1401 * junk and/or it has put us in CLOSE_WAIT
1402 */
1403static void xs_tcp_force_close(struct rpc_xprt *xprt)
1404{
1405 xprt_force_disconnect(xprt);
1406}
1407
1408#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1409static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1410{
1411 return PAGE_SIZE;
1412}
1413#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1414
1415/**
1416 * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1417 * @sk: socket whose state has changed
1418 *
1419 */
1420static void xs_local_state_change(struct sock *sk)
1421{
1422 struct rpc_xprt *xprt;
1423 struct sock_xprt *transport;
1424
1425 if (!(xprt = xprt_from_sock(sk)))
1426 return;
1427 transport = container_of(xprt, struct sock_xprt, xprt);
1428 if (sk->sk_shutdown & SHUTDOWN_MASK) {
1429 clear_bit(XPRT_CONNECTED, &xprt->state);
1430 /* Trigger the socket release */
1431 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1432 }
1433}
1434
1435/**
1436 * xs_tcp_state_change - callback to handle TCP socket state changes
1437 * @sk: socket whose state has changed
1438 *
1439 */
1440static void xs_tcp_state_change(struct sock *sk)
1441{
1442 struct rpc_xprt *xprt;
1443 struct sock_xprt *transport;
1444
1445 if (!(xprt = xprt_from_sock(sk)))
1446 return;
1447 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1448 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1449 sk->sk_state, xprt_connected(xprt),
1450 sock_flag(sk, SOCK_DEAD),
1451 sock_flag(sk, SOCK_ZAPPED),
1452 sk->sk_shutdown);
1453
1454 transport = container_of(xprt, struct sock_xprt, xprt);
1455 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1456 switch (sk->sk_state) {
1457 case TCP_ESTABLISHED:
1458 if (!xprt_test_and_set_connected(xprt)) {
1459 xprt->connect_cookie++;
1460 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1461 xprt_clear_connecting(xprt);
1462
1463 xprt->stat.connect_count++;
1464 xprt->stat.connect_time += (long)jiffies -
1465 xprt->stat.connect_start;
1466 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1467 }
1468 break;
1469 case TCP_FIN_WAIT1:
1470 /* The client initiated a shutdown of the socket */
1471 xprt->connect_cookie++;
1472 xprt->reestablish_timeout = 0;
1473 set_bit(XPRT_CLOSING, &xprt->state);
1474 smp_mb__before_atomic();
1475 clear_bit(XPRT_CONNECTED, &xprt->state);
1476 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1477 smp_mb__after_atomic();
1478 break;
1479 case TCP_CLOSE_WAIT:
1480 /* The server initiated a shutdown of the socket */
1481 xprt->connect_cookie++;
1482 clear_bit(XPRT_CONNECTED, &xprt->state);
1483 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1484 fallthrough;
1485 case TCP_CLOSING:
1486 /*
1487 * If the server closed down the connection, make sure that
1488 * we back off before reconnecting
1489 */
1490 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1491 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1492 break;
1493 case TCP_LAST_ACK:
1494 set_bit(XPRT_CLOSING, &xprt->state);
1495 smp_mb__before_atomic();
1496 clear_bit(XPRT_CONNECTED, &xprt->state);
1497 smp_mb__after_atomic();
1498 break;
1499 case TCP_CLOSE:
1500 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1501 &transport->sock_state))
1502 xprt_clear_connecting(xprt);
1503 clear_bit(XPRT_CLOSING, &xprt->state);
1504 /* Trigger the socket release */
1505 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1506 }
1507}
1508
1509static void xs_write_space(struct sock *sk)
1510{
1511 struct sock_xprt *transport;
1512 struct rpc_xprt *xprt;
1513
1514 if (!sk->sk_socket)
1515 return;
1516 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1517
1518 if (unlikely(!(xprt = xprt_from_sock(sk))))
1519 return;
1520 transport = container_of(xprt, struct sock_xprt, xprt);
1521 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1522 return;
1523 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1524 sk->sk_write_pending--;
1525}
1526
1527/**
1528 * xs_udp_write_space - callback invoked when socket buffer space
1529 * becomes available
1530 * @sk: socket whose state has changed
1531 *
1532 * Called when more output buffer space is available for this socket.
1533 * We try not to wake our writers until they can make "significant"
1534 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1535 * with a bunch of small requests.
1536 */
1537static void xs_udp_write_space(struct sock *sk)
1538{
1539 /* from net/core/sock.c:sock_def_write_space */
1540 if (sock_writeable(sk))
1541 xs_write_space(sk);
1542}
1543
1544/**
1545 * xs_tcp_write_space - callback invoked when socket buffer space
1546 * becomes available
1547 * @sk: socket whose state has changed
1548 *
1549 * Called when more output buffer space is available for this socket.
1550 * We try not to wake our writers until they can make "significant"
1551 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1552 * with a bunch of small requests.
1553 */
1554static void xs_tcp_write_space(struct sock *sk)
1555{
1556 /* from net/core/stream.c:sk_stream_write_space */
1557 if (sk_stream_is_writeable(sk))
1558 xs_write_space(sk);
1559}
1560
1561static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1562{
1563 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1564 struct sock *sk = transport->inet;
1565
1566 if (transport->rcvsize) {
1567 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1568 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1569 }
1570 if (transport->sndsize) {
1571 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1572 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1573 sk->sk_write_space(sk);
1574 }
1575}
1576
1577/**
1578 * xs_udp_set_buffer_size - set send and receive limits
1579 * @xprt: generic transport
1580 * @sndsize: requested size of send buffer, in bytes
1581 * @rcvsize: requested size of receive buffer, in bytes
1582 *
1583 * Set socket send and receive buffer size limits.
1584 */
1585static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1586{
1587 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1588
1589 transport->sndsize = 0;
1590 if (sndsize)
1591 transport->sndsize = sndsize + 1024;
1592 transport->rcvsize = 0;
1593 if (rcvsize)
1594 transport->rcvsize = rcvsize + 1024;
1595
1596 xs_udp_do_set_buffer_size(xprt);
1597}
1598
1599/**
1600 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1601 * @xprt: controlling transport
1602 * @task: task that timed out
1603 *
1604 * Adjust the congestion window after a retransmit timeout has occurred.
1605 */
1606static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1607{
1608 spin_lock(&xprt->transport_lock);
1609 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1610 spin_unlock(&xprt->transport_lock);
1611}
1612
1613static int xs_get_random_port(void)
1614{
1615 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1616 unsigned short range;
1617 unsigned short rand;
1618
1619 if (max < min)
1620 return -EADDRINUSE;
1621 range = max - min + 1;
1622 rand = get_random_u32_below(range);
1623 return rand + min;
1624}
1625
1626static unsigned short xs_sock_getport(struct socket *sock)
1627{
1628 struct sockaddr_storage buf;
1629 unsigned short port = 0;
1630
1631 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1632 goto out;
1633 switch (buf.ss_family) {
1634 case AF_INET6:
1635 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1636 break;
1637 case AF_INET:
1638 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1639 }
1640out:
1641 return port;
1642}
1643
1644/**
1645 * xs_set_port - reset the port number in the remote endpoint address
1646 * @xprt: generic transport
1647 * @port: new port number
1648 *
1649 */
1650static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1651{
1652 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1653
1654 rpc_set_port(xs_addr(xprt), port);
1655 xs_update_peer_port(xprt);
1656}
1657
1658static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1659{
1660 if (transport->srcport == 0 && transport->xprt.reuseport)
1661 transport->srcport = xs_sock_getport(sock);
1662}
1663
1664static int xs_get_srcport(struct sock_xprt *transport)
1665{
1666 int port = transport->srcport;
1667
1668 if (port == 0 && transport->xprt.resvport)
1669 port = xs_get_random_port();
1670 return port;
1671}
1672
1673static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1674{
1675 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1676 unsigned short ret = 0;
1677 mutex_lock(&sock->recv_mutex);
1678 if (sock->sock)
1679 ret = xs_sock_getport(sock->sock);
1680 mutex_unlock(&sock->recv_mutex);
1681 return ret;
1682}
1683
1684static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1685{
1686 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1687 union {
1688 struct sockaddr sa;
1689 struct sockaddr_storage st;
1690 } saddr;
1691 int ret = -ENOTCONN;
1692
1693 mutex_lock(&sock->recv_mutex);
1694 if (sock->sock) {
1695 ret = kernel_getsockname(sock->sock, &saddr.sa);
1696 if (ret >= 0)
1697 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1698 }
1699 mutex_unlock(&sock->recv_mutex);
1700 return ret;
1701}
1702
1703static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1704{
1705 if (transport->srcport != 0)
1706 transport->srcport = 0;
1707 if (!transport->xprt.resvport)
1708 return 0;
1709 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1710 return xprt_max_resvport;
1711 return --port;
1712}
1713static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1714{
1715 struct sockaddr_storage myaddr;
1716 int err, nloop = 0;
1717 int port = xs_get_srcport(transport);
1718 unsigned short last;
1719
1720 /*
1721 * If we are asking for any ephemeral port (i.e. port == 0 &&
1722 * transport->xprt.resvport == 0), don't bind. Let the local
1723 * port selection happen implicitly when the socket is used
1724 * (for example at connect time).
1725 *
1726 * This ensures that we can continue to establish TCP
1727 * connections even when all local ephemeral ports are already
1728 * a part of some TCP connection. This makes no difference
1729 * for UDP sockets, but also doesn't harm them.
1730 *
1731 * If we're asking for any reserved port (i.e. port == 0 &&
1732 * transport->xprt.resvport == 1) xs_get_srcport above will
1733 * ensure that port is non-zero and we will bind as needed.
1734 */
1735 if (port <= 0)
1736 return port;
1737
1738 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1739 do {
1740 rpc_set_port((struct sockaddr *)&myaddr, port);
1741 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1742 transport->xprt.addrlen);
1743 if (err == 0) {
1744 if (transport->xprt.reuseport)
1745 transport->srcport = port;
1746 break;
1747 }
1748 last = port;
1749 port = xs_next_srcport(transport, port);
1750 if (port > last)
1751 nloop++;
1752 } while (err == -EADDRINUSE && nloop != 2);
1753
1754 if (myaddr.ss_family == AF_INET)
1755 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1756 &((struct sockaddr_in *)&myaddr)->sin_addr,
1757 port, err ? "failed" : "ok", err);
1758 else
1759 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1760 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1761 port, err ? "failed" : "ok", err);
1762 return err;
1763}
1764
1765/*
1766 * We don't support autobind on AF_LOCAL sockets
1767 */
1768static void xs_local_rpcbind(struct rpc_task *task)
1769{
1770 xprt_set_bound(task->tk_xprt);
1771}
1772
1773static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1774{
1775}
1776
1777#ifdef CONFIG_DEBUG_LOCK_ALLOC
1778static struct lock_class_key xs_key[3];
1779static struct lock_class_key xs_slock_key[3];
1780
1781static inline void xs_reclassify_socketu(struct socket *sock)
1782{
1783 struct sock *sk = sock->sk;
1784
1785 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1786 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1787}
1788
1789static inline void xs_reclassify_socket4(struct socket *sock)
1790{
1791 struct sock *sk = sock->sk;
1792
1793 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1794 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1795}
1796
1797static inline void xs_reclassify_socket6(struct socket *sock)
1798{
1799 struct sock *sk = sock->sk;
1800
1801 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1802 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1803}
1804
1805static inline void xs_reclassify_socket(int family, struct socket *sock)
1806{
1807 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1808 return;
1809
1810 switch (family) {
1811 case AF_LOCAL:
1812 xs_reclassify_socketu(sock);
1813 break;
1814 case AF_INET:
1815 xs_reclassify_socket4(sock);
1816 break;
1817 case AF_INET6:
1818 xs_reclassify_socket6(sock);
1819 break;
1820 }
1821}
1822#else
1823static inline void xs_reclassify_socket(int family, struct socket *sock)
1824{
1825}
1826#endif
1827
1828static void xs_dummy_setup_socket(struct work_struct *work)
1829{
1830}
1831
1832static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1833 struct sock_xprt *transport, int family, int type,
1834 int protocol, bool reuseport)
1835{
1836 struct file *filp;
1837 struct socket *sock;
1838 int err;
1839
1840 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1841 if (err < 0) {
1842 dprintk("RPC: can't create %d transport socket (%d).\n",
1843 protocol, -err);
1844 goto out;
1845 }
1846 xs_reclassify_socket(family, sock);
1847
1848 if (reuseport)
1849 sock_set_reuseport(sock->sk);
1850
1851 err = xs_bind(transport, sock);
1852 if (err) {
1853 sock_release(sock);
1854 goto out;
1855 }
1856
1857 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1858 if (IS_ERR(filp))
1859 return ERR_CAST(filp);
1860 transport->file = filp;
1861
1862 return sock;
1863out:
1864 return ERR_PTR(err);
1865}
1866
1867static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1868 struct socket *sock)
1869{
1870 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1871 xprt);
1872
1873 if (!transport->inet) {
1874 struct sock *sk = sock->sk;
1875
1876 lock_sock(sk);
1877
1878 xs_save_old_callbacks(transport, sk);
1879
1880 sk->sk_user_data = xprt;
1881 sk->sk_data_ready = xs_data_ready;
1882 sk->sk_write_space = xs_udp_write_space;
1883 sk->sk_state_change = xs_local_state_change;
1884 sk->sk_error_report = xs_error_report;
1885 sk->sk_use_task_frag = false;
1886
1887 xprt_clear_connected(xprt);
1888
1889 /* Reset to new socket */
1890 transport->sock = sock;
1891 transport->inet = sk;
1892
1893 release_sock(sk);
1894 }
1895
1896 xs_stream_start_connect(transport);
1897
1898 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1899}
1900
1901/**
1902 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1903 * @transport: socket transport to connect
1904 */
1905static int xs_local_setup_socket(struct sock_xprt *transport)
1906{
1907 struct rpc_xprt *xprt = &transport->xprt;
1908 struct file *filp;
1909 struct socket *sock;
1910 int status;
1911
1912 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1913 SOCK_STREAM, 0, &sock, 1);
1914 if (status < 0) {
1915 dprintk("RPC: can't create AF_LOCAL "
1916 "transport socket (%d).\n", -status);
1917 goto out;
1918 }
1919 xs_reclassify_socket(AF_LOCAL, sock);
1920
1921 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1922 if (IS_ERR(filp)) {
1923 status = PTR_ERR(filp);
1924 goto out;
1925 }
1926 transport->file = filp;
1927
1928 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1929 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1930
1931 status = xs_local_finish_connecting(xprt, sock);
1932 trace_rpc_socket_connect(xprt, sock, status);
1933 switch (status) {
1934 case 0:
1935 dprintk("RPC: xprt %p connected to %s\n",
1936 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1937 xprt->stat.connect_count++;
1938 xprt->stat.connect_time += (long)jiffies -
1939 xprt->stat.connect_start;
1940 xprt_set_connected(xprt);
1941 break;
1942 case -ENOBUFS:
1943 break;
1944 case -ENOENT:
1945 dprintk("RPC: xprt %p: socket %s does not exist\n",
1946 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1947 break;
1948 case -ECONNREFUSED:
1949 dprintk("RPC: xprt %p: connection refused for %s\n",
1950 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1951 break;
1952 default:
1953 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1954 __func__, -status,
1955 xprt->address_strings[RPC_DISPLAY_ADDR]);
1956 }
1957
1958out:
1959 xprt_clear_connecting(xprt);
1960 xprt_wake_pending_tasks(xprt, status);
1961 return status;
1962}
1963
1964static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1965{
1966 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1967 int ret;
1968
1969 if (transport->file)
1970 goto force_disconnect;
1971
1972 if (RPC_IS_ASYNC(task)) {
1973 /*
1974 * We want the AF_LOCAL connect to be resolved in the
1975 * filesystem namespace of the process making the rpc
1976 * call. Thus we connect synchronously.
1977 *
1978 * If we want to support asynchronous AF_LOCAL calls,
1979 * we'll need to figure out how to pass a namespace to
1980 * connect.
1981 */
1982 rpc_task_set_rpc_status(task, -ENOTCONN);
1983 goto out_wake;
1984 }
1985 ret = xs_local_setup_socket(transport);
1986 if (ret && !RPC_IS_SOFTCONN(task))
1987 msleep_interruptible(15000);
1988 return;
1989force_disconnect:
1990 xprt_force_disconnect(xprt);
1991out_wake:
1992 xprt_clear_connecting(xprt);
1993 xprt_wake_pending_tasks(xprt, -ENOTCONN);
1994}
1995
1996#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1997/*
1998 * Note that this should be called with XPRT_LOCKED held, or recv_mutex
1999 * held, or when we otherwise know that we have exclusive access to the
2000 * socket, to guard against races with xs_reset_transport.
2001 */
2002static void xs_set_memalloc(struct rpc_xprt *xprt)
2003{
2004 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2005 xprt);
2006
2007 /*
2008 * If there's no sock, then we have nothing to set. The
2009 * reconnecting process will get it for us.
2010 */
2011 if (!transport->inet)
2012 return;
2013 if (atomic_read(&xprt->swapper))
2014 sk_set_memalloc(transport->inet);
2015}
2016
2017/**
2018 * xs_enable_swap - Tag this transport as being used for swap.
2019 * @xprt: transport to tag
2020 *
2021 * Take a reference to this transport on behalf of the rpc_clnt, and
2022 * optionally mark it for swapping if it wasn't already.
2023 */
2024static int
2025xs_enable_swap(struct rpc_xprt *xprt)
2026{
2027 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2028
2029 mutex_lock(&xs->recv_mutex);
2030 if (atomic_inc_return(&xprt->swapper) == 1 &&
2031 xs->inet)
2032 sk_set_memalloc(xs->inet);
2033 mutex_unlock(&xs->recv_mutex);
2034 return 0;
2035}
2036
2037/**
2038 * xs_disable_swap - Untag this transport as being used for swap.
2039 * @xprt: transport to tag
2040 *
2041 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2042 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2043 */
2044static void
2045xs_disable_swap(struct rpc_xprt *xprt)
2046{
2047 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2048
2049 mutex_lock(&xs->recv_mutex);
2050 if (atomic_dec_and_test(&xprt->swapper) &&
2051 xs->inet)
2052 sk_clear_memalloc(xs->inet);
2053 mutex_unlock(&xs->recv_mutex);
2054}
2055#else
2056static void xs_set_memalloc(struct rpc_xprt *xprt)
2057{
2058}
2059
2060static int
2061xs_enable_swap(struct rpc_xprt *xprt)
2062{
2063 return -EINVAL;
2064}
2065
2066static void
2067xs_disable_swap(struct rpc_xprt *xprt)
2068{
2069}
2070#endif
2071
2072static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2073{
2074 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2075
2076 if (!transport->inet) {
2077 struct sock *sk = sock->sk;
2078
2079 lock_sock(sk);
2080
2081 xs_save_old_callbacks(transport, sk);
2082
2083 sk->sk_user_data = xprt;
2084 sk->sk_data_ready = xs_data_ready;
2085 sk->sk_write_space = xs_udp_write_space;
2086 sk->sk_use_task_frag = false;
2087
2088 xprt_set_connected(xprt);
2089
2090 /* Reset to new socket */
2091 transport->sock = sock;
2092 transport->inet = sk;
2093
2094 xs_set_memalloc(xprt);
2095
2096 release_sock(sk);
2097 }
2098 xs_udp_do_set_buffer_size(xprt);
2099
2100 xprt->stat.connect_start = jiffies;
2101}
2102
2103static void xs_udp_setup_socket(struct work_struct *work)
2104{
2105 struct sock_xprt *transport =
2106 container_of(work, struct sock_xprt, connect_worker.work);
2107 struct rpc_xprt *xprt = &transport->xprt;
2108 struct socket *sock;
2109 int status = -EIO;
2110 unsigned int pflags = current->flags;
2111
2112 if (atomic_read(&xprt->swapper))
2113 current->flags |= PF_MEMALLOC;
2114 sock = xs_create_sock(xprt, transport,
2115 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2116 IPPROTO_UDP, false);
2117 if (IS_ERR(sock))
2118 goto out;
2119
2120 dprintk("RPC: worker connecting xprt %p via %s to "
2121 "%s (port %s)\n", xprt,
2122 xprt->address_strings[RPC_DISPLAY_PROTO],
2123 xprt->address_strings[RPC_DISPLAY_ADDR],
2124 xprt->address_strings[RPC_DISPLAY_PORT]);
2125
2126 xs_udp_finish_connecting(xprt, sock);
2127 trace_rpc_socket_connect(xprt, sock, 0);
2128 status = 0;
2129out:
2130 xprt_clear_connecting(xprt);
2131 xprt_unlock_connect(xprt, transport);
2132 xprt_wake_pending_tasks(xprt, status);
2133 current_restore_flags(pflags, PF_MEMALLOC);
2134}
2135
2136/**
2137 * xs_tcp_shutdown - gracefully shut down a TCP socket
2138 * @xprt: transport
2139 *
2140 * Initiates a graceful shutdown of the TCP socket by calling the
2141 * equivalent of shutdown(SHUT_RDWR);
2142 */
2143static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2144{
2145 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2146 struct socket *sock = transport->sock;
2147 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2148
2149 if (sock == NULL)
2150 return;
2151 if (!xprt->reuseport) {
2152 xs_close(xprt);
2153 return;
2154 }
2155 switch (skst) {
2156 case TCP_FIN_WAIT1:
2157 case TCP_FIN_WAIT2:
2158 break;
2159 case TCP_ESTABLISHED:
2160 case TCP_CLOSE_WAIT:
2161 kernel_sock_shutdown(sock, SHUT_RDWR);
2162 trace_rpc_socket_shutdown(xprt, sock);
2163 break;
2164 default:
2165 xs_reset_transport(transport);
2166 }
2167}
2168
2169static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2170 struct socket *sock)
2171{
2172 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2173 unsigned int keepidle;
2174 unsigned int keepcnt;
2175 unsigned int timeo;
2176
2177 spin_lock(&xprt->transport_lock);
2178 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2179 keepcnt = xprt->timeout->to_retries + 1;
2180 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2181 (xprt->timeout->to_retries + 1);
2182 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2183 spin_unlock(&xprt->transport_lock);
2184
2185 /* TCP Keepalive options */
2186 sock_set_keepalive(sock->sk);
2187 tcp_sock_set_keepidle(sock->sk, keepidle);
2188 tcp_sock_set_keepintvl(sock->sk, keepidle);
2189 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2190
2191 /* TCP user timeout (see RFC5482) */
2192 tcp_sock_set_user_timeout(sock->sk, timeo);
2193}
2194
2195static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2196 unsigned long connect_timeout,
2197 unsigned long reconnect_timeout)
2198{
2199 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2200 struct rpc_timeout to;
2201 unsigned long initval;
2202
2203 spin_lock(&xprt->transport_lock);
2204 if (reconnect_timeout < xprt->max_reconnect_timeout)
2205 xprt->max_reconnect_timeout = reconnect_timeout;
2206 if (connect_timeout < xprt->connect_timeout) {
2207 memcpy(&to, xprt->timeout, sizeof(to));
2208 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2209 /* Arbitrary lower limit */
2210 if (initval < XS_TCP_INIT_REEST_TO << 1)
2211 initval = XS_TCP_INIT_REEST_TO << 1;
2212 to.to_initval = initval;
2213 to.to_maxval = initval;
2214 memcpy(&transport->tcp_timeout, &to,
2215 sizeof(transport->tcp_timeout));
2216 xprt->timeout = &transport->tcp_timeout;
2217 xprt->connect_timeout = connect_timeout;
2218 }
2219 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2220 spin_unlock(&xprt->transport_lock);
2221}
2222
2223static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2224{
2225 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2226
2227 if (!transport->inet) {
2228 struct sock *sk = sock->sk;
2229
2230 /* Avoid temporary address, they are bad for long-lived
2231 * connections such as NFS mounts.
2232 * RFC4941, section 3.6 suggests that:
2233 * Individual applications, which have specific
2234 * knowledge about the normal duration of connections,
2235 * MAY override this as appropriate.
2236 */
2237 if (xs_addr(xprt)->sa_family == PF_INET6) {
2238 ip6_sock_set_addr_preferences(sk,
2239 IPV6_PREFER_SRC_PUBLIC);
2240 }
2241
2242 xs_tcp_set_socket_timeouts(xprt, sock);
2243 tcp_sock_set_nodelay(sk);
2244
2245 lock_sock(sk);
2246
2247 xs_save_old_callbacks(transport, sk);
2248
2249 sk->sk_user_data = xprt;
2250 sk->sk_data_ready = xs_data_ready;
2251 sk->sk_state_change = xs_tcp_state_change;
2252 sk->sk_write_space = xs_tcp_write_space;
2253 sk->sk_error_report = xs_error_report;
2254 sk->sk_use_task_frag = false;
2255
2256 /* socket options */
2257 sock_reset_flag(sk, SOCK_LINGER);
2258
2259 xprt_clear_connected(xprt);
2260
2261 /* Reset to new socket */
2262 transport->sock = sock;
2263 transport->inet = sk;
2264
2265 release_sock(sk);
2266 }
2267
2268 if (!xprt_bound(xprt))
2269 return -ENOTCONN;
2270
2271 xs_set_memalloc(xprt);
2272
2273 xs_stream_start_connect(transport);
2274
2275 /* Tell the socket layer to start connecting... */
2276 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2277 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2278}
2279
2280/**
2281 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2282 * @work: queued work item
2283 *
2284 * Invoked by a work queue tasklet.
2285 */
2286static void xs_tcp_setup_socket(struct work_struct *work)
2287{
2288 struct sock_xprt *transport =
2289 container_of(work, struct sock_xprt, connect_worker.work);
2290 struct socket *sock = transport->sock;
2291 struct rpc_xprt *xprt = &transport->xprt;
2292 int status;
2293 unsigned int pflags = current->flags;
2294
2295 if (atomic_read(&xprt->swapper))
2296 current->flags |= PF_MEMALLOC;
2297
2298 if (xprt_connected(xprt))
2299 goto out;
2300 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2301 &transport->sock_state) ||
2302 !sock) {
2303 xs_reset_transport(transport);
2304 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2305 SOCK_STREAM, IPPROTO_TCP, true);
2306 if (IS_ERR(sock)) {
2307 xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2308 goto out;
2309 }
2310 }
2311
2312 dprintk("RPC: worker connecting xprt %p via %s to "
2313 "%s (port %s)\n", xprt,
2314 xprt->address_strings[RPC_DISPLAY_PROTO],
2315 xprt->address_strings[RPC_DISPLAY_ADDR],
2316 xprt->address_strings[RPC_DISPLAY_PORT]);
2317
2318 status = xs_tcp_finish_connecting(xprt, sock);
2319 trace_rpc_socket_connect(xprt, sock, status);
2320 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2321 xprt, -status, xprt_connected(xprt),
2322 sock->sk->sk_state);
2323 switch (status) {
2324 case 0:
2325 case -EINPROGRESS:
2326 /* SYN_SENT! */
2327 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2328 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2329 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2330 fallthrough;
2331 case -EALREADY:
2332 goto out_unlock;
2333 case -EADDRNOTAVAIL:
2334 /* Source port number is unavailable. Try a new one! */
2335 transport->srcport = 0;
2336 status = -EAGAIN;
2337 break;
2338 case -EINVAL:
2339 /* Happens, for instance, if the user specified a link
2340 * local IPv6 address without a scope-id.
2341 */
2342 case -ECONNREFUSED:
2343 case -ECONNRESET:
2344 case -ENETDOWN:
2345 case -ENETUNREACH:
2346 case -EHOSTUNREACH:
2347 case -EADDRINUSE:
2348 case -ENOBUFS:
2349 break;
2350 default:
2351 printk("%s: connect returned unhandled error %d\n",
2352 __func__, status);
2353 status = -EAGAIN;
2354 }
2355
2356 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2357 * We need to wake them first to ensure the correct error code.
2358 */
2359 xprt_wake_pending_tasks(xprt, status);
2360 xs_tcp_force_close(xprt);
2361out:
2362 xprt_clear_connecting(xprt);
2363out_unlock:
2364 xprt_unlock_connect(xprt, transport);
2365 current_restore_flags(pflags, PF_MEMALLOC);
2366}
2367
2368/**
2369 * xs_connect - connect a socket to a remote endpoint
2370 * @xprt: pointer to transport structure
2371 * @task: address of RPC task that manages state of connect request
2372 *
2373 * TCP: If the remote end dropped the connection, delay reconnecting.
2374 *
2375 * UDP socket connects are synchronous, but we use a work queue anyway
2376 * to guarantee that even unprivileged user processes can set up a
2377 * socket on a privileged port.
2378 *
2379 * If a UDP socket connect fails, the delay behavior here prevents
2380 * retry floods (hard mounts).
2381 */
2382static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2383{
2384 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2385 unsigned long delay = 0;
2386
2387 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2388
2389 if (transport->sock != NULL) {
2390 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2391 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2392
2393 delay = xprt_reconnect_delay(xprt);
2394 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2395
2396 } else
2397 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2398
2399 queue_delayed_work(xprtiod_workqueue,
2400 &transport->connect_worker,
2401 delay);
2402}
2403
2404static void xs_wake_disconnect(struct sock_xprt *transport)
2405{
2406 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2407 xs_tcp_force_close(&transport->xprt);
2408}
2409
2410static void xs_wake_write(struct sock_xprt *transport)
2411{
2412 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2413 xprt_write_space(&transport->xprt);
2414}
2415
2416static void xs_wake_error(struct sock_xprt *transport)
2417{
2418 int sockerr;
2419
2420 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2421 return;
2422 mutex_lock(&transport->recv_mutex);
2423 if (transport->sock == NULL)
2424 goto out;
2425 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2426 goto out;
2427 sockerr = xchg(&transport->xprt_err, 0);
2428 if (sockerr < 0)
2429 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2430out:
2431 mutex_unlock(&transport->recv_mutex);
2432}
2433
2434static void xs_wake_pending(struct sock_xprt *transport)
2435{
2436 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2437 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2438}
2439
2440static void xs_error_handle(struct work_struct *work)
2441{
2442 struct sock_xprt *transport = container_of(work,
2443 struct sock_xprt, error_worker);
2444
2445 xs_wake_disconnect(transport);
2446 xs_wake_write(transport);
2447 xs_wake_error(transport);
2448 xs_wake_pending(transport);
2449}
2450
2451/**
2452 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2453 * @xprt: rpc_xprt struct containing statistics
2454 * @seq: output file
2455 *
2456 */
2457static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2458{
2459 long idle_time = 0;
2460
2461 if (xprt_connected(xprt))
2462 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2463
2464 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2465 "%llu %llu %lu %llu %llu\n",
2466 xprt->stat.bind_count,
2467 xprt->stat.connect_count,
2468 xprt->stat.connect_time / HZ,
2469 idle_time,
2470 xprt->stat.sends,
2471 xprt->stat.recvs,
2472 xprt->stat.bad_xids,
2473 xprt->stat.req_u,
2474 xprt->stat.bklog_u,
2475 xprt->stat.max_slots,
2476 xprt->stat.sending_u,
2477 xprt->stat.pending_u);
2478}
2479
2480/**
2481 * xs_udp_print_stats - display UDP socket-specific stats
2482 * @xprt: rpc_xprt struct containing statistics
2483 * @seq: output file
2484 *
2485 */
2486static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2487{
2488 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2489
2490 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2491 "%lu %llu %llu\n",
2492 transport->srcport,
2493 xprt->stat.bind_count,
2494 xprt->stat.sends,
2495 xprt->stat.recvs,
2496 xprt->stat.bad_xids,
2497 xprt->stat.req_u,
2498 xprt->stat.bklog_u,
2499 xprt->stat.max_slots,
2500 xprt->stat.sending_u,
2501 xprt->stat.pending_u);
2502}
2503
2504/**
2505 * xs_tcp_print_stats - display TCP socket-specific stats
2506 * @xprt: rpc_xprt struct containing statistics
2507 * @seq: output file
2508 *
2509 */
2510static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2511{
2512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2513 long idle_time = 0;
2514
2515 if (xprt_connected(xprt))
2516 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2517
2518 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2519 "%llu %llu %lu %llu %llu\n",
2520 transport->srcport,
2521 xprt->stat.bind_count,
2522 xprt->stat.connect_count,
2523 xprt->stat.connect_time / HZ,
2524 idle_time,
2525 xprt->stat.sends,
2526 xprt->stat.recvs,
2527 xprt->stat.bad_xids,
2528 xprt->stat.req_u,
2529 xprt->stat.bklog_u,
2530 xprt->stat.max_slots,
2531 xprt->stat.sending_u,
2532 xprt->stat.pending_u);
2533}
2534
2535/*
2536 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2537 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2538 * to use the server side send routines.
2539 */
2540static int bc_malloc(struct rpc_task *task)
2541{
2542 struct rpc_rqst *rqst = task->tk_rqstp;
2543 size_t size = rqst->rq_callsize;
2544 struct page *page;
2545 struct rpc_buffer *buf;
2546
2547 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2548 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2549 size);
2550 return -EINVAL;
2551 }
2552
2553 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2554 if (!page)
2555 return -ENOMEM;
2556
2557 buf = page_address(page);
2558 buf->len = PAGE_SIZE;
2559
2560 rqst->rq_buffer = buf->data;
2561 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2562 return 0;
2563}
2564
2565/*
2566 * Free the space allocated in the bc_alloc routine
2567 */
2568static void bc_free(struct rpc_task *task)
2569{
2570 void *buffer = task->tk_rqstp->rq_buffer;
2571 struct rpc_buffer *buf;
2572
2573 buf = container_of(buffer, struct rpc_buffer, data);
2574 free_page((unsigned long)buf);
2575}
2576
2577static int bc_sendto(struct rpc_rqst *req)
2578{
2579 struct xdr_buf *xdr = &req->rq_snd_buf;
2580 struct sock_xprt *transport =
2581 container_of(req->rq_xprt, struct sock_xprt, xprt);
2582 struct msghdr msg = {
2583 .msg_flags = 0,
2584 };
2585 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2586 (u32)xdr->len);
2587 unsigned int sent = 0;
2588 int err;
2589
2590 req->rq_xtime = ktime_get();
2591 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2592 if (err < 0)
2593 return err;
2594 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2595 xdr_free_bvec(xdr);
2596 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2597 return -EAGAIN;
2598 return sent;
2599}
2600
2601/**
2602 * bc_send_request - Send a backchannel Call on a TCP socket
2603 * @req: rpc_rqst containing Call message to be sent
2604 *
2605 * xpt_mutex ensures @rqstp's whole message is written to the socket
2606 * without interruption.
2607 *
2608 * Return values:
2609 * %0 if the message was sent successfully
2610 * %ENOTCONN if the message was not sent
2611 */
2612static int bc_send_request(struct rpc_rqst *req)
2613{
2614 struct svc_xprt *xprt;
2615 int len;
2616
2617 /*
2618 * Get the server socket associated with this callback xprt
2619 */
2620 xprt = req->rq_xprt->bc_xprt;
2621
2622 /*
2623 * Grab the mutex to serialize data as the connection is shared
2624 * with the fore channel
2625 */
2626 mutex_lock(&xprt->xpt_mutex);
2627 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2628 len = -ENOTCONN;
2629 else
2630 len = bc_sendto(req);
2631 mutex_unlock(&xprt->xpt_mutex);
2632
2633 if (len > 0)
2634 len = 0;
2635
2636 return len;
2637}
2638
2639/*
2640 * The close routine. Since this is client initiated, we do nothing
2641 */
2642
2643static void bc_close(struct rpc_xprt *xprt)
2644{
2645 xprt_disconnect_done(xprt);
2646}
2647
2648/*
2649 * The xprt destroy routine. Again, because this connection is client
2650 * initiated, we do nothing
2651 */
2652
2653static void bc_destroy(struct rpc_xprt *xprt)
2654{
2655 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2656
2657 xs_xprt_free(xprt);
2658 module_put(THIS_MODULE);
2659}
2660
2661static const struct rpc_xprt_ops xs_local_ops = {
2662 .reserve_xprt = xprt_reserve_xprt,
2663 .release_xprt = xprt_release_xprt,
2664 .alloc_slot = xprt_alloc_slot,
2665 .free_slot = xprt_free_slot,
2666 .rpcbind = xs_local_rpcbind,
2667 .set_port = xs_local_set_port,
2668 .connect = xs_local_connect,
2669 .buf_alloc = rpc_malloc,
2670 .buf_free = rpc_free,
2671 .prepare_request = xs_stream_prepare_request,
2672 .send_request = xs_local_send_request,
2673 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2674 .close = xs_close,
2675 .destroy = xs_destroy,
2676 .print_stats = xs_local_print_stats,
2677 .enable_swap = xs_enable_swap,
2678 .disable_swap = xs_disable_swap,
2679};
2680
2681static const struct rpc_xprt_ops xs_udp_ops = {
2682 .set_buffer_size = xs_udp_set_buffer_size,
2683 .reserve_xprt = xprt_reserve_xprt_cong,
2684 .release_xprt = xprt_release_xprt_cong,
2685 .alloc_slot = xprt_alloc_slot,
2686 .free_slot = xprt_free_slot,
2687 .rpcbind = rpcb_getport_async,
2688 .set_port = xs_set_port,
2689 .connect = xs_connect,
2690 .get_srcaddr = xs_sock_srcaddr,
2691 .get_srcport = xs_sock_srcport,
2692 .buf_alloc = rpc_malloc,
2693 .buf_free = rpc_free,
2694 .send_request = xs_udp_send_request,
2695 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2696 .timer = xs_udp_timer,
2697 .release_request = xprt_release_rqst_cong,
2698 .close = xs_close,
2699 .destroy = xs_destroy,
2700 .print_stats = xs_udp_print_stats,
2701 .enable_swap = xs_enable_swap,
2702 .disable_swap = xs_disable_swap,
2703 .inject_disconnect = xs_inject_disconnect,
2704};
2705
2706static const struct rpc_xprt_ops xs_tcp_ops = {
2707 .reserve_xprt = xprt_reserve_xprt,
2708 .release_xprt = xprt_release_xprt,
2709 .alloc_slot = xprt_alloc_slot,
2710 .free_slot = xprt_free_slot,
2711 .rpcbind = rpcb_getport_async,
2712 .set_port = xs_set_port,
2713 .connect = xs_connect,
2714 .get_srcaddr = xs_sock_srcaddr,
2715 .get_srcport = xs_sock_srcport,
2716 .buf_alloc = rpc_malloc,
2717 .buf_free = rpc_free,
2718 .prepare_request = xs_stream_prepare_request,
2719 .send_request = xs_tcp_send_request,
2720 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2721 .close = xs_tcp_shutdown,
2722 .destroy = xs_destroy,
2723 .set_connect_timeout = xs_tcp_set_connect_timeout,
2724 .print_stats = xs_tcp_print_stats,
2725 .enable_swap = xs_enable_swap,
2726 .disable_swap = xs_disable_swap,
2727 .inject_disconnect = xs_inject_disconnect,
2728#ifdef CONFIG_SUNRPC_BACKCHANNEL
2729 .bc_setup = xprt_setup_bc,
2730 .bc_maxpayload = xs_tcp_bc_maxpayload,
2731 .bc_num_slots = xprt_bc_max_slots,
2732 .bc_free_rqst = xprt_free_bc_rqst,
2733 .bc_destroy = xprt_destroy_bc,
2734#endif
2735};
2736
2737/*
2738 * The rpc_xprt_ops for the server backchannel
2739 */
2740
2741static const struct rpc_xprt_ops bc_tcp_ops = {
2742 .reserve_xprt = xprt_reserve_xprt,
2743 .release_xprt = xprt_release_xprt,
2744 .alloc_slot = xprt_alloc_slot,
2745 .free_slot = xprt_free_slot,
2746 .buf_alloc = bc_malloc,
2747 .buf_free = bc_free,
2748 .send_request = bc_send_request,
2749 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2750 .close = bc_close,
2751 .destroy = bc_destroy,
2752 .print_stats = xs_tcp_print_stats,
2753 .enable_swap = xs_enable_swap,
2754 .disable_swap = xs_disable_swap,
2755 .inject_disconnect = xs_inject_disconnect,
2756};
2757
2758static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2759{
2760 static const struct sockaddr_in sin = {
2761 .sin_family = AF_INET,
2762 .sin_addr.s_addr = htonl(INADDR_ANY),
2763 };
2764 static const struct sockaddr_in6 sin6 = {
2765 .sin6_family = AF_INET6,
2766 .sin6_addr = IN6ADDR_ANY_INIT,
2767 };
2768
2769 switch (family) {
2770 case AF_LOCAL:
2771 break;
2772 case AF_INET:
2773 memcpy(sap, &sin, sizeof(sin));
2774 break;
2775 case AF_INET6:
2776 memcpy(sap, &sin6, sizeof(sin6));
2777 break;
2778 default:
2779 dprintk("RPC: %s: Bad address family\n", __func__);
2780 return -EAFNOSUPPORT;
2781 }
2782 return 0;
2783}
2784
2785static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2786 unsigned int slot_table_size,
2787 unsigned int max_slot_table_size)
2788{
2789 struct rpc_xprt *xprt;
2790 struct sock_xprt *new;
2791
2792 if (args->addrlen > sizeof(xprt->addr)) {
2793 dprintk("RPC: xs_setup_xprt: address too large\n");
2794 return ERR_PTR(-EBADF);
2795 }
2796
2797 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2798 max_slot_table_size);
2799 if (xprt == NULL) {
2800 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2801 "rpc_xprt\n");
2802 return ERR_PTR(-ENOMEM);
2803 }
2804
2805 new = container_of(xprt, struct sock_xprt, xprt);
2806 mutex_init(&new->recv_mutex);
2807 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2808 xprt->addrlen = args->addrlen;
2809 if (args->srcaddr)
2810 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2811 else {
2812 int err;
2813 err = xs_init_anyaddr(args->dstaddr->sa_family,
2814 (struct sockaddr *)&new->srcaddr);
2815 if (err != 0) {
2816 xprt_free(xprt);
2817 return ERR_PTR(err);
2818 }
2819 }
2820
2821 return xprt;
2822}
2823
2824static const struct rpc_timeout xs_local_default_timeout = {
2825 .to_initval = 10 * HZ,
2826 .to_maxval = 10 * HZ,
2827 .to_retries = 2,
2828};
2829
2830/**
2831 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2832 * @args: rpc transport creation arguments
2833 *
2834 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2835 */
2836static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2837{
2838 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2839 struct sock_xprt *transport;
2840 struct rpc_xprt *xprt;
2841 struct rpc_xprt *ret;
2842
2843 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2844 xprt_max_tcp_slot_table_entries);
2845 if (IS_ERR(xprt))
2846 return xprt;
2847 transport = container_of(xprt, struct sock_xprt, xprt);
2848
2849 xprt->prot = 0;
2850 xprt->xprt_class = &xs_local_transport;
2851 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2852
2853 xprt->bind_timeout = XS_BIND_TO;
2854 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2855 xprt->idle_timeout = XS_IDLE_DISC_TO;
2856
2857 xprt->ops = &xs_local_ops;
2858 xprt->timeout = &xs_local_default_timeout;
2859
2860 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2861 INIT_WORK(&transport->error_worker, xs_error_handle);
2862 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2863
2864 switch (sun->sun_family) {
2865 case AF_LOCAL:
2866 if (sun->sun_path[0] != '/') {
2867 dprintk("RPC: bad AF_LOCAL address: %s\n",
2868 sun->sun_path);
2869 ret = ERR_PTR(-EINVAL);
2870 goto out_err;
2871 }
2872 xprt_set_bound(xprt);
2873 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2874 break;
2875 default:
2876 ret = ERR_PTR(-EAFNOSUPPORT);
2877 goto out_err;
2878 }
2879
2880 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2881 xprt->address_strings[RPC_DISPLAY_ADDR]);
2882
2883 if (try_module_get(THIS_MODULE))
2884 return xprt;
2885 ret = ERR_PTR(-EINVAL);
2886out_err:
2887 xs_xprt_free(xprt);
2888 return ret;
2889}
2890
2891static const struct rpc_timeout xs_udp_default_timeout = {
2892 .to_initval = 5 * HZ,
2893 .to_maxval = 30 * HZ,
2894 .to_increment = 5 * HZ,
2895 .to_retries = 5,
2896};
2897
2898/**
2899 * xs_setup_udp - Set up transport to use a UDP socket
2900 * @args: rpc transport creation arguments
2901 *
2902 */
2903static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2904{
2905 struct sockaddr *addr = args->dstaddr;
2906 struct rpc_xprt *xprt;
2907 struct sock_xprt *transport;
2908 struct rpc_xprt *ret;
2909
2910 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2911 xprt_udp_slot_table_entries);
2912 if (IS_ERR(xprt))
2913 return xprt;
2914 transport = container_of(xprt, struct sock_xprt, xprt);
2915
2916 xprt->prot = IPPROTO_UDP;
2917 xprt->xprt_class = &xs_udp_transport;
2918 /* XXX: header size can vary due to auth type, IPv6, etc. */
2919 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2920
2921 xprt->bind_timeout = XS_BIND_TO;
2922 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2923 xprt->idle_timeout = XS_IDLE_DISC_TO;
2924
2925 xprt->ops = &xs_udp_ops;
2926
2927 xprt->timeout = &xs_udp_default_timeout;
2928
2929 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2930 INIT_WORK(&transport->error_worker, xs_error_handle);
2931 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2932
2933 switch (addr->sa_family) {
2934 case AF_INET:
2935 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2936 xprt_set_bound(xprt);
2937
2938 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2939 break;
2940 case AF_INET6:
2941 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2942 xprt_set_bound(xprt);
2943
2944 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2945 break;
2946 default:
2947 ret = ERR_PTR(-EAFNOSUPPORT);
2948 goto out_err;
2949 }
2950
2951 if (xprt_bound(xprt))
2952 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2953 xprt->address_strings[RPC_DISPLAY_ADDR],
2954 xprt->address_strings[RPC_DISPLAY_PORT],
2955 xprt->address_strings[RPC_DISPLAY_PROTO]);
2956 else
2957 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2958 xprt->address_strings[RPC_DISPLAY_ADDR],
2959 xprt->address_strings[RPC_DISPLAY_PROTO]);
2960
2961 if (try_module_get(THIS_MODULE))
2962 return xprt;
2963 ret = ERR_PTR(-EINVAL);
2964out_err:
2965 xs_xprt_free(xprt);
2966 return ret;
2967}
2968
2969static const struct rpc_timeout xs_tcp_default_timeout = {
2970 .to_initval = 60 * HZ,
2971 .to_maxval = 60 * HZ,
2972 .to_retries = 2,
2973};
2974
2975/**
2976 * xs_setup_tcp - Set up transport to use a TCP socket
2977 * @args: rpc transport creation arguments
2978 *
2979 */
2980static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2981{
2982 struct sockaddr *addr = args->dstaddr;
2983 struct rpc_xprt *xprt;
2984 struct sock_xprt *transport;
2985 struct rpc_xprt *ret;
2986 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2987
2988 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2989 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2990
2991 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2992 max_slot_table_size);
2993 if (IS_ERR(xprt))
2994 return xprt;
2995 transport = container_of(xprt, struct sock_xprt, xprt);
2996
2997 xprt->prot = IPPROTO_TCP;
2998 xprt->xprt_class = &xs_tcp_transport;
2999 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3000
3001 xprt->bind_timeout = XS_BIND_TO;
3002 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3003 xprt->idle_timeout = XS_IDLE_DISC_TO;
3004
3005 xprt->ops = &xs_tcp_ops;
3006 xprt->timeout = &xs_tcp_default_timeout;
3007
3008 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3009 xprt->connect_timeout = xprt->timeout->to_initval *
3010 (xprt->timeout->to_retries + 1);
3011
3012 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3013 INIT_WORK(&transport->error_worker, xs_error_handle);
3014 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3015
3016 switch (addr->sa_family) {
3017 case AF_INET:
3018 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3019 xprt_set_bound(xprt);
3020
3021 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3022 break;
3023 case AF_INET6:
3024 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3025 xprt_set_bound(xprt);
3026
3027 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3028 break;
3029 default:
3030 ret = ERR_PTR(-EAFNOSUPPORT);
3031 goto out_err;
3032 }
3033
3034 if (xprt_bound(xprt))
3035 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3036 xprt->address_strings[RPC_DISPLAY_ADDR],
3037 xprt->address_strings[RPC_DISPLAY_PORT],
3038 xprt->address_strings[RPC_DISPLAY_PROTO]);
3039 else
3040 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3041 xprt->address_strings[RPC_DISPLAY_ADDR],
3042 xprt->address_strings[RPC_DISPLAY_PROTO]);
3043
3044 if (try_module_get(THIS_MODULE))
3045 return xprt;
3046 ret = ERR_PTR(-EINVAL);
3047out_err:
3048 xs_xprt_free(xprt);
3049 return ret;
3050}
3051
3052/**
3053 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3054 * @args: rpc transport creation arguments
3055 *
3056 */
3057static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3058{
3059 struct sockaddr *addr = args->dstaddr;
3060 struct rpc_xprt *xprt;
3061 struct sock_xprt *transport;
3062 struct svc_sock *bc_sock;
3063 struct rpc_xprt *ret;
3064
3065 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3066 xprt_tcp_slot_table_entries);
3067 if (IS_ERR(xprt))
3068 return xprt;
3069 transport = container_of(xprt, struct sock_xprt, xprt);
3070
3071 xprt->prot = IPPROTO_TCP;
3072 xprt->xprt_class = &xs_bc_tcp_transport;
3073 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3074 xprt->timeout = &xs_tcp_default_timeout;
3075
3076 /* backchannel */
3077 xprt_set_bound(xprt);
3078 xprt->bind_timeout = 0;
3079 xprt->reestablish_timeout = 0;
3080 xprt->idle_timeout = 0;
3081
3082 xprt->ops = &bc_tcp_ops;
3083
3084 switch (addr->sa_family) {
3085 case AF_INET:
3086 xs_format_peer_addresses(xprt, "tcp",
3087 RPCBIND_NETID_TCP);
3088 break;
3089 case AF_INET6:
3090 xs_format_peer_addresses(xprt, "tcp",
3091 RPCBIND_NETID_TCP6);
3092 break;
3093 default:
3094 ret = ERR_PTR(-EAFNOSUPPORT);
3095 goto out_err;
3096 }
3097
3098 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3099 xprt->address_strings[RPC_DISPLAY_ADDR],
3100 xprt->address_strings[RPC_DISPLAY_PORT],
3101 xprt->address_strings[RPC_DISPLAY_PROTO]);
3102
3103 /*
3104 * Once we've associated a backchannel xprt with a connection,
3105 * we want to keep it around as long as the connection lasts,
3106 * in case we need to start using it for a backchannel again;
3107 * this reference won't be dropped until bc_xprt is destroyed.
3108 */
3109 xprt_get(xprt);
3110 args->bc_xprt->xpt_bc_xprt = xprt;
3111 xprt->bc_xprt = args->bc_xprt;
3112 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3113 transport->sock = bc_sock->sk_sock;
3114 transport->inet = bc_sock->sk_sk;
3115
3116 /*
3117 * Since we don't want connections for the backchannel, we set
3118 * the xprt status to connected
3119 */
3120 xprt_set_connected(xprt);
3121
3122 if (try_module_get(THIS_MODULE))
3123 return xprt;
3124
3125 args->bc_xprt->xpt_bc_xprt = NULL;
3126 args->bc_xprt->xpt_bc_xps = NULL;
3127 xprt_put(xprt);
3128 ret = ERR_PTR(-EINVAL);
3129out_err:
3130 xs_xprt_free(xprt);
3131 return ret;
3132}
3133
3134static struct xprt_class xs_local_transport = {
3135 .list = LIST_HEAD_INIT(xs_local_transport.list),
3136 .name = "named UNIX socket",
3137 .owner = THIS_MODULE,
3138 .ident = XPRT_TRANSPORT_LOCAL,
3139 .setup = xs_setup_local,
3140 .netid = { "" },
3141};
3142
3143static struct xprt_class xs_udp_transport = {
3144 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3145 .name = "udp",
3146 .owner = THIS_MODULE,
3147 .ident = XPRT_TRANSPORT_UDP,
3148 .setup = xs_setup_udp,
3149 .netid = { "udp", "udp6", "" },
3150};
3151
3152static struct xprt_class xs_tcp_transport = {
3153 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3154 .name = "tcp",
3155 .owner = THIS_MODULE,
3156 .ident = XPRT_TRANSPORT_TCP,
3157 .setup = xs_setup_tcp,
3158 .netid = { "tcp", "tcp6", "" },
3159};
3160
3161static struct xprt_class xs_bc_tcp_transport = {
3162 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3163 .name = "tcp NFSv4.1 backchannel",
3164 .owner = THIS_MODULE,
3165 .ident = XPRT_TRANSPORT_BC_TCP,
3166 .setup = xs_setup_bc_tcp,
3167 .netid = { "" },
3168};
3169
3170/**
3171 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3172 *
3173 */
3174int init_socket_xprt(void)
3175{
3176 if (!sunrpc_table_header)
3177 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3178
3179 xprt_register_transport(&xs_local_transport);
3180 xprt_register_transport(&xs_udp_transport);
3181 xprt_register_transport(&xs_tcp_transport);
3182 xprt_register_transport(&xs_bc_tcp_transport);
3183
3184 return 0;
3185}
3186
3187/**
3188 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3189 *
3190 */
3191void cleanup_socket_xprt(void)
3192{
3193 if (sunrpc_table_header) {
3194 unregister_sysctl_table(sunrpc_table_header);
3195 sunrpc_table_header = NULL;
3196 }
3197
3198 xprt_unregister_transport(&xs_local_transport);
3199 xprt_unregister_transport(&xs_udp_transport);
3200 xprt_unregister_transport(&xs_tcp_transport);
3201 xprt_unregister_transport(&xs_bc_tcp_transport);
3202}
3203
3204static int param_set_portnr(const char *val, const struct kernel_param *kp)
3205{
3206 return param_set_uint_minmax(val, kp,
3207 RPC_MIN_RESVPORT,
3208 RPC_MAX_RESVPORT);
3209}
3210
3211static const struct kernel_param_ops param_ops_portnr = {
3212 .set = param_set_portnr,
3213 .get = param_get_uint,
3214};
3215
3216#define param_check_portnr(name, p) \
3217 __param_check(name, p, unsigned int);
3218
3219module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3220module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3221
3222static int param_set_slot_table_size(const char *val,
3223 const struct kernel_param *kp)
3224{
3225 return param_set_uint_minmax(val, kp,
3226 RPC_MIN_SLOT_TABLE,
3227 RPC_MAX_SLOT_TABLE);
3228}
3229
3230static const struct kernel_param_ops param_ops_slot_table_size = {
3231 .set = param_set_slot_table_size,
3232 .get = param_get_uint,
3233};
3234
3235#define param_check_slot_table_size(name, p) \
3236 __param_check(name, p, unsigned int);
3237
3238static int param_set_max_slot_table_size(const char *val,
3239 const struct kernel_param *kp)
3240{
3241 return param_set_uint_minmax(val, kp,
3242 RPC_MIN_SLOT_TABLE,
3243 RPC_MAX_SLOT_TABLE_LIMIT);
3244}
3245
3246static const struct kernel_param_ops param_ops_max_slot_table_size = {
3247 .set = param_set_max_slot_table_size,
3248 .get = param_get_uint,
3249};
3250
3251#define param_check_max_slot_table_size(name, p) \
3252 __param_check(name, p, unsigned int);
3253
3254module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3255 slot_table_size, 0644);
3256module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3257 max_slot_table_size, 0644);
3258module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3259 slot_table_size, 0644);