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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
51#include <trace/events/sunrpc.h>
52
53#include "sunrpc.h"
54
55#define RPC_TCP_READ_CHUNK_SZ (3*512*1024)
56
57static void xs_close(struct rpc_xprt *xprt);
58static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
59 struct socket *sock);
60
61
62
63
64static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
65static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
66static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
67
68static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
69static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
70
71#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
72
73#define XS_TCP_LINGER_TO (15U * HZ)
74static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
75
76
77
78
79
80
81
82
83
84
85static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
86static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
87static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
88static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
89static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
90
91static struct ctl_table_header *sunrpc_table_header;
92
93
94
95
96
97static struct ctl_table xs_tunables_table[] = {
98 {
99 .procname = "udp_slot_table_entries",
100 .data = &xprt_udp_slot_table_entries,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = proc_dointvec_minmax,
104 .extra1 = &min_slot_table_size,
105 .extra2 = &max_slot_table_size
106 },
107 {
108 .procname = "tcp_slot_table_entries",
109 .data = &xprt_tcp_slot_table_entries,
110 .maxlen = sizeof(unsigned int),
111 .mode = 0644,
112 .proc_handler = proc_dointvec_minmax,
113 .extra1 = &min_slot_table_size,
114 .extra2 = &max_slot_table_size
115 },
116 {
117 .procname = "tcp_max_slot_table_entries",
118 .data = &xprt_max_tcp_slot_table_entries,
119 .maxlen = sizeof(unsigned int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = &min_slot_table_size,
123 .extra2 = &max_tcp_slot_table_limit
124 },
125 {
126 .procname = "min_resvport",
127 .data = &xprt_min_resvport,
128 .maxlen = sizeof(unsigned int),
129 .mode = 0644,
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &xprt_min_resvport_limit,
132 .extra2 = &xprt_max_resvport
133 },
134 {
135 .procname = "max_resvport",
136 .data = &xprt_max_resvport,
137 .maxlen = sizeof(unsigned int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = &xprt_min_resvport,
141 .extra2 = &xprt_max_resvport_limit
142 },
143 {
144 .procname = "tcp_fin_timeout",
145 .data = &xs_tcp_fin_timeout,
146 .maxlen = sizeof(xs_tcp_fin_timeout),
147 .mode = 0644,
148 .proc_handler = proc_dointvec_jiffies,
149 },
150 { },
151};
152
153static struct ctl_table sunrpc_table[] = {
154 {
155 .procname = "sunrpc",
156 .mode = 0555,
157 .child = xs_tunables_table
158 },
159 { },
160};
161
162#endif
163
164
165
166
167#define XS_BIND_TO (60U * HZ)
168
169
170
171
172
173#define XS_UDP_REEST_TO (2U * HZ)
174
175
176
177
178
179
180
181
182
183
184#define XS_TCP_INIT_REEST_TO (3U * HZ)
185
186
187
188
189
190
191#define XS_IDLE_DISC_TO (5U * 60 * HZ)
192
193#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
194# undef RPC_DEBUG_DATA
195# define RPCDBG_FACILITY RPCDBG_TRANS
196#endif
197
198#ifdef RPC_DEBUG_DATA
199static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
200{
201 u8 *buf = (u8 *) packet;
202 int j;
203
204 dprintk("RPC: %s\n", msg);
205 for (j = 0; j < count && j < 128; j += 4) {
206 if (!(j & 31)) {
207 if (j)
208 dprintk("\n");
209 dprintk("0x%04x ", j);
210 }
211 dprintk("%02x%02x%02x%02x ",
212 buf[j], buf[j+1], buf[j+2], buf[j+3]);
213 }
214 dprintk("\n");
215}
216#else
217static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
218{
219
220}
221#endif
222
223static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
224{
225 return (struct rpc_xprt *) sk->sk_user_data;
226}
227
228static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
229{
230 return (struct sockaddr *) &xprt->addr;
231}
232
233static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
234{
235 return (struct sockaddr_un *) &xprt->addr;
236}
237
238static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
239{
240 return (struct sockaddr_in *) &xprt->addr;
241}
242
243static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
244{
245 return (struct sockaddr_in6 *) &xprt->addr;
246}
247
248static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
249{
250 struct sockaddr *sap = xs_addr(xprt);
251 struct sockaddr_in6 *sin6;
252 struct sockaddr_in *sin;
253 struct sockaddr_un *sun;
254 char buf[128];
255
256 switch (sap->sa_family) {
257 case AF_LOCAL:
258 sun = xs_addr_un(xprt);
259 strlcpy(buf, sun->sun_path, sizeof(buf));
260 xprt->address_strings[RPC_DISPLAY_ADDR] =
261 kstrdup(buf, GFP_KERNEL);
262 break;
263 case AF_INET:
264 (void)rpc_ntop(sap, buf, sizeof(buf));
265 xprt->address_strings[RPC_DISPLAY_ADDR] =
266 kstrdup(buf, GFP_KERNEL);
267 sin = xs_addr_in(xprt);
268 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
269 break;
270 case AF_INET6:
271 (void)rpc_ntop(sap, buf, sizeof(buf));
272 xprt->address_strings[RPC_DISPLAY_ADDR] =
273 kstrdup(buf, GFP_KERNEL);
274 sin6 = xs_addr_in6(xprt);
275 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
276 break;
277 default:
278 BUG();
279 }
280
281 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
282}
283
284static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
285{
286 struct sockaddr *sap = xs_addr(xprt);
287 char buf[128];
288
289 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
290 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
291
292 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
293 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
294}
295
296static void xs_format_peer_addresses(struct rpc_xprt *xprt,
297 const char *protocol,
298 const char *netid)
299{
300 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
301 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
302 xs_format_common_peer_addresses(xprt);
303 xs_format_common_peer_ports(xprt);
304}
305
306static void xs_update_peer_port(struct rpc_xprt *xprt)
307{
308 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
309 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
310
311 xs_format_common_peer_ports(xprt);
312}
313
314static void xs_free_peer_addresses(struct rpc_xprt *xprt)
315{
316 unsigned int i;
317
318 for (i = 0; i < RPC_DISPLAY_MAX; i++)
319 switch (i) {
320 case RPC_DISPLAY_PROTO:
321 case RPC_DISPLAY_NETID:
322 continue;
323 default:
324 kfree(xprt->address_strings[i]);
325 }
326}
327
328#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
329
330static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
331{
332 struct msghdr msg = {
333 .msg_name = addr,
334 .msg_namelen = addrlen,
335 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
336 };
337 struct kvec iov = {
338 .iov_base = vec->iov_base + base,
339 .iov_len = vec->iov_len - base,
340 };
341
342 if (iov.iov_len != 0)
343 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
344 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
345}
346
347static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
348{
349 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
350 int offset, size_t size, int flags);
351 struct page **ppage;
352 unsigned int remainder;
353 int err;
354
355 remainder = xdr->page_len - base;
356 base += xdr->page_base;
357 ppage = xdr->pages + (base >> PAGE_SHIFT);
358 base &= ~PAGE_MASK;
359 do_sendpage = sock->ops->sendpage;
360 if (!zerocopy)
361 do_sendpage = sock_no_sendpage;
362 for(;;) {
363 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
364 int flags = XS_SENDMSG_FLAGS;
365
366 remainder -= len;
367 if (more)
368 flags |= MSG_MORE;
369 if (remainder != 0)
370 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
371 err = do_sendpage(sock, *ppage, base, len, flags);
372 if (remainder == 0 || err != len)
373 break;
374 *sent_p += err;
375 ppage++;
376 base = 0;
377 }
378 if (err > 0) {
379 *sent_p += err;
380 err = 0;
381 }
382 return err;
383}
384
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393
394
395
396static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
397{
398 unsigned int remainder = xdr->len - base;
399 int err = 0;
400 int sent = 0;
401
402 if (unlikely(!sock))
403 return -ENOTSOCK;
404
405 if (base != 0) {
406 addr = NULL;
407 addrlen = 0;
408 }
409
410 if (base < xdr->head[0].iov_len || addr != NULL) {
411 unsigned int len = xdr->head[0].iov_len - base;
412 remainder -= len;
413 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
414 if (remainder == 0 || err != len)
415 goto out;
416 *sent_p += err;
417 base = 0;
418 } else
419 base -= xdr->head[0].iov_len;
420
421 if (base < xdr->page_len) {
422 unsigned int len = xdr->page_len - base;
423 remainder -= len;
424 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
425 *sent_p += sent;
426 if (remainder == 0 || sent != len)
427 goto out;
428 base = 0;
429 } else
430 base -= xdr->page_len;
431
432 if (base >= xdr->tail[0].iov_len)
433 return 0;
434 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
435out:
436 if (err > 0) {
437 *sent_p += err;
438 err = 0;
439 }
440 return err;
441}
442
443static void xs_nospace_callback(struct rpc_task *task)
444{
445 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
446
447 transport->inet->sk_write_pending--;
448}
449
450
451
452
453
454
455static int xs_nospace(struct rpc_task *task)
456{
457 struct rpc_rqst *req = task->tk_rqstp;
458 struct rpc_xprt *xprt = req->rq_xprt;
459 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
460 struct sock *sk = transport->inet;
461 int ret = -EAGAIN;
462
463 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
464 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
465 req->rq_slen);
466
467
468 spin_lock_bh(&xprt->transport_lock);
469
470
471 if (xprt_connected(xprt)) {
472
473 sk->sk_write_pending++;
474 xprt_wait_for_buffer_space(task, xs_nospace_callback);
475 } else
476 ret = -ENOTCONN;
477
478 spin_unlock_bh(&xprt->transport_lock);
479
480
481 if (ret == -EAGAIN) {
482 struct socket_wq *wq;
483
484 rcu_read_lock();
485 wq = rcu_dereference(sk->sk_wq);
486 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
487 rcu_read_unlock();
488
489 sk->sk_write_space(sk);
490 }
491 return ret;
492}
493
494
495
496
497static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
498{
499 u32 reclen = buf->len - sizeof(rpc_fraghdr);
500 rpc_fraghdr *base = buf->head[0].iov_base;
501 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
502}
503
504
505
506
507
508
509
510
511
512
513
514
515static int xs_local_send_request(struct rpc_task *task)
516{
517 struct rpc_rqst *req = task->tk_rqstp;
518 struct rpc_xprt *xprt = req->rq_xprt;
519 struct sock_xprt *transport =
520 container_of(xprt, struct sock_xprt, xprt);
521 struct xdr_buf *xdr = &req->rq_snd_buf;
522 int status;
523 int sent = 0;
524
525 xs_encode_stream_record_marker(&req->rq_snd_buf);
526
527 xs_pktdump("packet data:",
528 req->rq_svec->iov_base, req->rq_svec->iov_len);
529
530 req->rq_xtime = ktime_get();
531 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
532 true, &sent);
533 dprintk("RPC: %s(%u) = %d\n",
534 __func__, xdr->len - req->rq_bytes_sent, status);
535
536 if (status == -EAGAIN && sock_writeable(transport->inet))
537 status = -ENOBUFS;
538
539 if (likely(sent > 0) || status == 0) {
540 req->rq_bytes_sent += sent;
541 req->rq_xmit_bytes_sent += sent;
542 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
543 req->rq_bytes_sent = 0;
544 return 0;
545 }
546 status = -EAGAIN;
547 }
548
549 switch (status) {
550 case -ENOBUFS:
551 break;
552 case -EAGAIN:
553 status = xs_nospace(task);
554 break;
555 default:
556 dprintk("RPC: sendmsg returned unrecognized error %d\n",
557 -status);
558
559 case -EPIPE:
560 xs_close(xprt);
561 status = -ENOTCONN;
562 }
563
564 return status;
565}
566
567
568
569
570
571
572
573
574
575
576
577
578static int xs_udp_send_request(struct rpc_task *task)
579{
580 struct rpc_rqst *req = task->tk_rqstp;
581 struct rpc_xprt *xprt = req->rq_xprt;
582 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
583 struct xdr_buf *xdr = &req->rq_snd_buf;
584 int sent = 0;
585 int status;
586
587 xs_pktdump("packet data:",
588 req->rq_svec->iov_base,
589 req->rq_svec->iov_len);
590
591 if (!xprt_bound(xprt))
592 return -ENOTCONN;
593 req->rq_xtime = ktime_get();
594 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
595 xdr, req->rq_bytes_sent, true, &sent);
596
597 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
598 xdr->len - req->rq_bytes_sent, status);
599
600
601 if (status == -EPERM)
602 goto process_status;
603
604 if (status == -EAGAIN && sock_writeable(transport->inet))
605 status = -ENOBUFS;
606
607 if (sent > 0 || status == 0) {
608 req->rq_xmit_bytes_sent += sent;
609 if (sent >= req->rq_slen)
610 return 0;
611
612 status = -EAGAIN;
613 }
614
615process_status:
616 switch (status) {
617 case -ENOTSOCK:
618 status = -ENOTCONN;
619
620 break;
621 case -EAGAIN:
622 status = xs_nospace(task);
623 break;
624 case -ENETUNREACH:
625 case -ENOBUFS:
626 case -EPIPE:
627 case -ECONNREFUSED:
628 case -EPERM:
629
630
631 break;
632 default:
633 dprintk("RPC: sendmsg returned unrecognized error %d\n",
634 -status);
635 }
636
637 return status;
638}
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654static int xs_tcp_send_request(struct rpc_task *task)
655{
656 struct rpc_rqst *req = task->tk_rqstp;
657 struct rpc_xprt *xprt = req->rq_xprt;
658 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
659 struct xdr_buf *xdr = &req->rq_snd_buf;
660 bool zerocopy = true;
661 bool vm_wait = false;
662 int status;
663 int sent;
664
665 xs_encode_stream_record_marker(&req->rq_snd_buf);
666
667 xs_pktdump("packet data:",
668 req->rq_svec->iov_base,
669 req->rq_svec->iov_len);
670
671
672
673
674 if (task->tk_flags & RPC_TASK_SENT)
675 zerocopy = false;
676
677 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
678 xs_tcp_set_socket_timeouts(xprt, transport->sock);
679
680
681
682
683 req->rq_xtime = ktime_get();
684 while (1) {
685 sent = 0;
686 status = xs_sendpages(transport->sock, NULL, 0, xdr,
687 req->rq_bytes_sent, zerocopy, &sent);
688
689 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
690 xdr->len - req->rq_bytes_sent, status);
691
692
693
694 req->rq_bytes_sent += sent;
695 req->rq_xmit_bytes_sent += sent;
696 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
697 req->rq_bytes_sent = 0;
698 return 0;
699 }
700
701 WARN_ON_ONCE(sent == 0 && status == 0);
702
703 if (status == -EAGAIN ) {
704
705
706
707
708 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
709 break;
710
711
712
713 if (sent == 0) {
714 status = -ENOBUFS;
715 if (vm_wait)
716 break;
717
718
719
720 vm_wait = true;
721 }
722 continue;
723 }
724 if (status < 0)
725 break;
726 vm_wait = false;
727 }
728
729 switch (status) {
730 case -ENOTSOCK:
731 status = -ENOTCONN;
732
733 break;
734 case -EAGAIN:
735 status = xs_nospace(task);
736 break;
737 case -ECONNRESET:
738 case -ECONNREFUSED:
739 case -ENOTCONN:
740 case -EADDRINUSE:
741 case -ENOBUFS:
742 case -EPIPE:
743 break;
744 default:
745 dprintk("RPC: sendmsg returned unrecognized error %d\n",
746 -status);
747 }
748
749 return status;
750}
751
752
753
754
755
756
757
758
759
760
761static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
762{
763 struct rpc_rqst *req;
764
765 if (task != xprt->snd_task)
766 return;
767 if (task == NULL)
768 goto out_release;
769 req = task->tk_rqstp;
770 if (req == NULL)
771 goto out_release;
772 if (req->rq_bytes_sent == 0)
773 goto out_release;
774 if (req->rq_bytes_sent == req->rq_snd_buf.len)
775 goto out_release;
776 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
777out_release:
778 xprt_release_xprt(xprt, task);
779}
780
781static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
782{
783 transport->old_data_ready = sk->sk_data_ready;
784 transport->old_state_change = sk->sk_state_change;
785 transport->old_write_space = sk->sk_write_space;
786 transport->old_error_report = sk->sk_error_report;
787}
788
789static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
790{
791 sk->sk_data_ready = transport->old_data_ready;
792 sk->sk_state_change = transport->old_state_change;
793 sk->sk_write_space = transport->old_write_space;
794 sk->sk_error_report = transport->old_error_report;
795}
796
797static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
798{
799 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
800
801 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
802}
803
804static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
805{
806 smp_mb__before_atomic();
807 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
808 clear_bit(XPRT_CLOSING, &xprt->state);
809 xs_sock_reset_state_flags(xprt);
810 smp_mb__after_atomic();
811}
812
813
814
815
816
817
818
819
820static void xs_error_report(struct sock *sk)
821{
822 struct rpc_xprt *xprt;
823 int err;
824
825 read_lock_bh(&sk->sk_callback_lock);
826 if (!(xprt = xprt_from_sock(sk)))
827 goto out;
828
829 err = -sk->sk_err;
830 if (err == 0)
831 goto out;
832 dprintk("RPC: xs_error_report client %p, error=%d...\n",
833 xprt, -err);
834 trace_rpc_socket_error(xprt, sk->sk_socket, err);
835 xprt_wake_pending_tasks(xprt, err);
836 out:
837 read_unlock_bh(&sk->sk_callback_lock);
838}
839
840static void xs_reset_transport(struct sock_xprt *transport)
841{
842 struct socket *sock = transport->sock;
843 struct sock *sk = transport->inet;
844 struct rpc_xprt *xprt = &transport->xprt;
845
846 if (sk == NULL)
847 return;
848
849 if (atomic_read(&transport->xprt.swapper))
850 sk_clear_memalloc(sk);
851
852 kernel_sock_shutdown(sock, SHUT_RDWR);
853
854 mutex_lock(&transport->recv_mutex);
855 write_lock_bh(&sk->sk_callback_lock);
856 transport->inet = NULL;
857 transport->sock = NULL;
858
859 sk->sk_user_data = NULL;
860
861 xs_restore_old_callbacks(transport, sk);
862 xprt_clear_connected(xprt);
863 write_unlock_bh(&sk->sk_callback_lock);
864 xs_sock_reset_connection_flags(xprt);
865 mutex_unlock(&transport->recv_mutex);
866
867 trace_rpc_socket_close(xprt, sock);
868 sock_release(sock);
869}
870
871
872
873
874
875
876
877
878
879
880
881static void xs_close(struct rpc_xprt *xprt)
882{
883 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
884
885 dprintk("RPC: xs_close xprt %p\n", xprt);
886
887 xs_reset_transport(transport);
888 xprt->reestablish_timeout = 0;
889
890 xprt_disconnect_done(xprt);
891}
892
893static void xs_inject_disconnect(struct rpc_xprt *xprt)
894{
895 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
896 xprt);
897 xprt_disconnect_done(xprt);
898}
899
900static void xs_xprt_free(struct rpc_xprt *xprt)
901{
902 xs_free_peer_addresses(xprt);
903 xprt_free(xprt);
904}
905
906
907
908
909
910
911static void xs_destroy(struct rpc_xprt *xprt)
912{
913 struct sock_xprt *transport = container_of(xprt,
914 struct sock_xprt, xprt);
915 dprintk("RPC: xs_destroy xprt %p\n", xprt);
916
917 cancel_delayed_work_sync(&transport->connect_worker);
918 xs_close(xprt);
919 cancel_work_sync(&transport->recv_worker);
920 xs_xprt_free(xprt);
921 module_put(THIS_MODULE);
922}
923
924static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
925{
926 struct xdr_skb_reader desc = {
927 .skb = skb,
928 .offset = sizeof(rpc_fraghdr),
929 .count = skb->len - sizeof(rpc_fraghdr),
930 };
931
932 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
933 return -1;
934 if (desc.count)
935 return -1;
936 return 0;
937}
938
939
940
941
942
943
944
945
946
947static void xs_local_data_read_skb(struct rpc_xprt *xprt,
948 struct sock *sk,
949 struct sk_buff *skb)
950{
951 struct rpc_task *task;
952 struct rpc_rqst *rovr;
953 int repsize, copied;
954 u32 _xid;
955 __be32 *xp;
956
957 repsize = skb->len - sizeof(rpc_fraghdr);
958 if (repsize < 4) {
959 dprintk("RPC: impossible RPC reply size %d\n", repsize);
960 return;
961 }
962
963
964 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
965 if (xp == NULL)
966 return;
967
968
969 spin_lock(&xprt->recv_lock);
970 rovr = xprt_lookup_rqst(xprt, *xp);
971 if (!rovr)
972 goto out_unlock;
973 xprt_pin_rqst(rovr);
974 spin_unlock(&xprt->recv_lock);
975 task = rovr->rq_task;
976
977 copied = rovr->rq_private_buf.buflen;
978 if (copied > repsize)
979 copied = repsize;
980
981 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
982 dprintk("RPC: sk_buff copy failed\n");
983 spin_lock(&xprt->recv_lock);
984 goto out_unpin;
985 }
986
987 spin_lock(&xprt->recv_lock);
988 xprt_complete_rqst(task, copied);
989out_unpin:
990 xprt_unpin_rqst(rovr);
991 out_unlock:
992 spin_unlock(&xprt->recv_lock);
993}
994
995static void xs_local_data_receive(struct sock_xprt *transport)
996{
997 struct sk_buff *skb;
998 struct sock *sk;
999 int err;
1000
1001restart:
1002 mutex_lock(&transport->recv_mutex);
1003 sk = transport->inet;
1004 if (sk == NULL)
1005 goto out;
1006 for (;;) {
1007 skb = skb_recv_datagram(sk, 0, 1, &err);
1008 if (skb != NULL) {
1009 xs_local_data_read_skb(&transport->xprt, sk, skb);
1010 skb_free_datagram(sk, skb);
1011 continue;
1012 }
1013 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1014 break;
1015 if (need_resched()) {
1016 mutex_unlock(&transport->recv_mutex);
1017 cond_resched();
1018 goto restart;
1019 }
1020 }
1021out:
1022 mutex_unlock(&transport->recv_mutex);
1023}
1024
1025static void xs_local_data_receive_workfn(struct work_struct *work)
1026{
1027 struct sock_xprt *transport =
1028 container_of(work, struct sock_xprt, recv_worker);
1029 xs_local_data_receive(transport);
1030}
1031
1032
1033
1034
1035
1036
1037
1038
1039static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1040 struct sock *sk,
1041 struct sk_buff *skb)
1042{
1043 struct rpc_task *task;
1044 struct rpc_rqst *rovr;
1045 int repsize, copied;
1046 u32 _xid;
1047 __be32 *xp;
1048
1049 repsize = skb->len;
1050 if (repsize < 4) {
1051 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1052 return;
1053 }
1054
1055
1056 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1057 if (xp == NULL)
1058 return;
1059
1060
1061 spin_lock(&xprt->recv_lock);
1062 rovr = xprt_lookup_rqst(xprt, *xp);
1063 if (!rovr)
1064 goto out_unlock;
1065 xprt_pin_rqst(rovr);
1066 xprt_update_rtt(rovr->rq_task);
1067 spin_unlock(&xprt->recv_lock);
1068 task = rovr->rq_task;
1069
1070 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1071 copied = repsize;
1072
1073
1074 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1075 spin_lock(&xprt->recv_lock);
1076 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1077 goto out_unpin;
1078 }
1079
1080
1081 spin_lock_bh(&xprt->transport_lock);
1082 xprt_adjust_cwnd(xprt, task, copied);
1083 spin_unlock_bh(&xprt->transport_lock);
1084 spin_lock(&xprt->recv_lock);
1085 xprt_complete_rqst(task, copied);
1086 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1087out_unpin:
1088 xprt_unpin_rqst(rovr);
1089 out_unlock:
1090 spin_unlock(&xprt->recv_lock);
1091}
1092
1093static void xs_udp_data_receive(struct sock_xprt *transport)
1094{
1095 struct sk_buff *skb;
1096 struct sock *sk;
1097 int err;
1098
1099restart:
1100 mutex_lock(&transport->recv_mutex);
1101 sk = transport->inet;
1102 if (sk == NULL)
1103 goto out;
1104 for (;;) {
1105 skb = skb_recv_udp(sk, 0, 1, &err);
1106 if (skb != NULL) {
1107 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1108 consume_skb(skb);
1109 continue;
1110 }
1111 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1112 break;
1113 if (need_resched()) {
1114 mutex_unlock(&transport->recv_mutex);
1115 cond_resched();
1116 goto restart;
1117 }
1118 }
1119out:
1120 mutex_unlock(&transport->recv_mutex);
1121}
1122
1123static void xs_udp_data_receive_workfn(struct work_struct *work)
1124{
1125 struct sock_xprt *transport =
1126 container_of(work, struct sock_xprt, recv_worker);
1127 xs_udp_data_receive(transport);
1128}
1129
1130
1131
1132
1133
1134
1135static void xs_data_ready(struct sock *sk)
1136{
1137 struct rpc_xprt *xprt;
1138
1139 read_lock_bh(&sk->sk_callback_lock);
1140 dprintk("RPC: xs_data_ready...\n");
1141 xprt = xprt_from_sock(sk);
1142 if (xprt != NULL) {
1143 struct sock_xprt *transport = container_of(xprt,
1144 struct sock_xprt, xprt);
1145 transport->old_data_ready(sk);
1146
1147
1148
1149 if (xprt->reestablish_timeout)
1150 xprt->reestablish_timeout = 0;
1151 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1152 queue_work(xprtiod_workqueue, &transport->recv_worker);
1153 }
1154 read_unlock_bh(&sk->sk_callback_lock);
1155}
1156
1157
1158
1159
1160
1161static void xs_tcp_force_close(struct rpc_xprt *xprt)
1162{
1163 xprt_force_disconnect(xprt);
1164}
1165
1166static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1167{
1168 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1169 size_t len, used;
1170 char *p;
1171
1172 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1173 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1174 used = xdr_skb_read_bits(desc, p, len);
1175 transport->tcp_offset += used;
1176 if (used != len)
1177 return;
1178
1179 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1180 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1181 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1182 else
1183 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1184 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1185
1186 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1187 transport->tcp_offset = 0;
1188
1189
1190 if (unlikely(transport->tcp_reclen < 8)) {
1191 dprintk("RPC: invalid TCP record fragment length\n");
1192 xs_tcp_force_close(xprt);
1193 return;
1194 }
1195 dprintk("RPC: reading TCP record fragment of length %d\n",
1196 transport->tcp_reclen);
1197}
1198
1199static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1200{
1201 if (transport->tcp_offset == transport->tcp_reclen) {
1202 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1203 transport->tcp_offset = 0;
1204 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1205 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1206 transport->tcp_flags |= TCP_RCV_COPY_XID;
1207 transport->tcp_copied = 0;
1208 }
1209 }
1210}
1211
1212static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1213{
1214 size_t len, used;
1215 char *p;
1216
1217 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1218 dprintk("RPC: reading XID (%zu bytes)\n", len);
1219 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1220 used = xdr_skb_read_bits(desc, p, len);
1221 transport->tcp_offset += used;
1222 if (used != len)
1223 return;
1224 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1225 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1226 transport->tcp_copied = 4;
1227 dprintk("RPC: reading %s XID %08x\n",
1228 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1229 : "request with",
1230 ntohl(transport->tcp_xid));
1231 xs_tcp_check_fraghdr(transport);
1232}
1233
1234static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1235 struct xdr_skb_reader *desc)
1236{
1237 size_t len, used;
1238 u32 offset;
1239 char *p;
1240
1241
1242
1243
1244
1245
1246
1247 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1248 len = sizeof(transport->tcp_calldir) - offset;
1249 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
1250 p = ((char *) &transport->tcp_calldir) + offset;
1251 used = xdr_skb_read_bits(desc, p, len);
1252 transport->tcp_offset += used;
1253 if (used != len)
1254 return;
1255 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1256
1257
1258
1259
1260 switch (ntohl(transport->tcp_calldir)) {
1261 case RPC_REPLY:
1262 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1263 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1264 transport->tcp_flags |= TCP_RPC_REPLY;
1265 break;
1266 case RPC_CALL:
1267 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1268 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1269 transport->tcp_flags &= ~TCP_RPC_REPLY;
1270 break;
1271 default:
1272 dprintk("RPC: invalid request message type\n");
1273 xs_tcp_force_close(&transport->xprt);
1274 }
1275 xs_tcp_check_fraghdr(transport);
1276}
1277
1278static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1279 struct xdr_skb_reader *desc,
1280 struct rpc_rqst *req)
1281{
1282 struct sock_xprt *transport =
1283 container_of(xprt, struct sock_xprt, xprt);
1284 struct xdr_buf *rcvbuf;
1285 size_t len;
1286 ssize_t r;
1287
1288 rcvbuf = &req->rq_private_buf;
1289
1290 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1291
1292
1293
1294 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1295 &transport->tcp_calldir,
1296 sizeof(transport->tcp_calldir));
1297 transport->tcp_copied += sizeof(transport->tcp_calldir);
1298 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1299 }
1300
1301 len = desc->count;
1302 if (len > transport->tcp_reclen - transport->tcp_offset)
1303 desc->count = transport->tcp_reclen - transport->tcp_offset;
1304 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1305 desc, xdr_skb_read_bits);
1306
1307 if (desc->count) {
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1318 dprintk("RPC: XID %08x truncated request\n",
1319 ntohl(transport->tcp_xid));
1320 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1321 "tcp_offset = %u, tcp_reclen = %u\n",
1322 xprt, transport->tcp_copied,
1323 transport->tcp_offset, transport->tcp_reclen);
1324 return;
1325 }
1326
1327 transport->tcp_copied += r;
1328 transport->tcp_offset += r;
1329 desc->count = len - r;
1330
1331 dprintk("RPC: XID %08x read %zd bytes\n",
1332 ntohl(transport->tcp_xid), r);
1333 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1334 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1335 transport->tcp_offset, transport->tcp_reclen);
1336
1337 if (transport->tcp_copied == req->rq_private_buf.buflen)
1338 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1339 else if (transport->tcp_offset == transport->tcp_reclen) {
1340 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1341 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1342 }
1343}
1344
1345
1346
1347
1348
1349static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1350 struct xdr_skb_reader *desc)
1351{
1352 struct sock_xprt *transport =
1353 container_of(xprt, struct sock_xprt, xprt);
1354 struct rpc_rqst *req;
1355
1356 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1357
1358
1359 spin_lock(&xprt->recv_lock);
1360 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1361 if (!req) {
1362 dprintk("RPC: XID %08x request not found!\n",
1363 ntohl(transport->tcp_xid));
1364 spin_unlock(&xprt->recv_lock);
1365 return -1;
1366 }
1367 xprt_pin_rqst(req);
1368 spin_unlock(&xprt->recv_lock);
1369
1370 xs_tcp_read_common(xprt, desc, req);
1371
1372 spin_lock(&xprt->recv_lock);
1373 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1374 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1375 xprt_unpin_rqst(req);
1376 spin_unlock(&xprt->recv_lock);
1377 return 0;
1378}
1379
1380#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1381
1382
1383
1384
1385
1386
1387
1388static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1389 struct xdr_skb_reader *desc)
1390{
1391 struct sock_xprt *transport =
1392 container_of(xprt, struct sock_xprt, xprt);
1393 struct rpc_rqst *req;
1394
1395
1396 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1397 if (req == NULL) {
1398 printk(KERN_WARNING "Callback slot table overflowed\n");
1399 xprt_force_disconnect(xprt);
1400 return -1;
1401 }
1402
1403 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1404 xs_tcp_read_common(xprt, desc, req);
1405
1406 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1407 xprt_complete_bc_request(req, transport->tcp_copied);
1408
1409 return 0;
1410}
1411
1412static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1413 struct xdr_skb_reader *desc)
1414{
1415 struct sock_xprt *transport =
1416 container_of(xprt, struct sock_xprt, xprt);
1417
1418 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1419 xs_tcp_read_reply(xprt, desc) :
1420 xs_tcp_read_callback(xprt, desc);
1421}
1422
1423static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1424{
1425 int ret;
1426
1427 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1428 SVC_SOCK_ANONYMOUS);
1429 if (ret < 0)
1430 return ret;
1431 return 0;
1432}
1433
1434static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1435{
1436 return PAGE_SIZE;
1437}
1438#else
1439static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1440 struct xdr_skb_reader *desc)
1441{
1442 return xs_tcp_read_reply(xprt, desc);
1443}
1444#endif
1445
1446
1447
1448
1449
1450static void xs_tcp_read_data(struct rpc_xprt *xprt,
1451 struct xdr_skb_reader *desc)
1452{
1453 struct sock_xprt *transport =
1454 container_of(xprt, struct sock_xprt, xprt);
1455
1456 if (_xs_tcp_read_data(xprt, desc) == 0)
1457 xs_tcp_check_fraghdr(transport);
1458 else {
1459
1460
1461
1462
1463 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1464 }
1465}
1466
1467static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1468{
1469 size_t len;
1470
1471 len = transport->tcp_reclen - transport->tcp_offset;
1472 if (len > desc->count)
1473 len = desc->count;
1474 desc->count -= len;
1475 desc->offset += len;
1476 transport->tcp_offset += len;
1477 dprintk("RPC: discarded %zu bytes\n", len);
1478 xs_tcp_check_fraghdr(transport);
1479}
1480
1481static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1482{
1483 struct rpc_xprt *xprt = rd_desc->arg.data;
1484 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1485 struct xdr_skb_reader desc = {
1486 .skb = skb,
1487 .offset = offset,
1488 .count = len,
1489 };
1490 size_t ret;
1491
1492 dprintk("RPC: xs_tcp_data_recv started\n");
1493 do {
1494 trace_xs_tcp_data_recv(transport);
1495
1496
1497 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1498 xs_tcp_read_fraghdr(xprt, &desc);
1499 continue;
1500 }
1501
1502 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1503 xs_tcp_read_xid(transport, &desc);
1504 continue;
1505 }
1506
1507 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1508 xs_tcp_read_calldir(transport, &desc);
1509 continue;
1510 }
1511
1512 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1513 xs_tcp_read_data(xprt, &desc);
1514 continue;
1515 }
1516
1517 xs_tcp_read_discard(transport, &desc);
1518 } while (desc.count);
1519 ret = len - desc.count;
1520 if (ret < rd_desc->count)
1521 rd_desc->count -= ret;
1522 else
1523 rd_desc->count = 0;
1524 trace_xs_tcp_data_recv(transport);
1525 dprintk("RPC: xs_tcp_data_recv done\n");
1526 return ret;
1527}
1528
1529static void xs_tcp_data_receive(struct sock_xprt *transport)
1530{
1531 struct rpc_xprt *xprt = &transport->xprt;
1532 struct sock *sk;
1533 read_descriptor_t rd_desc = {
1534 .arg.data = xprt,
1535 };
1536 unsigned long total = 0;
1537 int read = 0;
1538
1539restart:
1540 mutex_lock(&transport->recv_mutex);
1541 sk = transport->inet;
1542 if (sk == NULL)
1543 goto out;
1544
1545
1546 for (;;) {
1547 rd_desc.count = RPC_TCP_READ_CHUNK_SZ;
1548 lock_sock(sk);
1549 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1550 if (rd_desc.count != 0 || read < 0) {
1551 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1552 release_sock(sk);
1553 break;
1554 }
1555 release_sock(sk);
1556 total += read;
1557 if (need_resched()) {
1558 mutex_unlock(&transport->recv_mutex);
1559 cond_resched();
1560 goto restart;
1561 }
1562 }
1563 if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1564 queue_work(xprtiod_workqueue, &transport->recv_worker);
1565out:
1566 mutex_unlock(&transport->recv_mutex);
1567 trace_xs_tcp_data_ready(xprt, read, total);
1568}
1569
1570static void xs_tcp_data_receive_workfn(struct work_struct *work)
1571{
1572 struct sock_xprt *transport =
1573 container_of(work, struct sock_xprt, recv_worker);
1574 xs_tcp_data_receive(transport);
1575}
1576
1577
1578
1579
1580
1581
1582static void xs_tcp_state_change(struct sock *sk)
1583{
1584 struct rpc_xprt *xprt;
1585 struct sock_xprt *transport;
1586
1587 read_lock_bh(&sk->sk_callback_lock);
1588 if (!(xprt = xprt_from_sock(sk)))
1589 goto out;
1590 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1591 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1592 sk->sk_state, xprt_connected(xprt),
1593 sock_flag(sk, SOCK_DEAD),
1594 sock_flag(sk, SOCK_ZAPPED),
1595 sk->sk_shutdown);
1596
1597 transport = container_of(xprt, struct sock_xprt, xprt);
1598 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1599 switch (sk->sk_state) {
1600 case TCP_ESTABLISHED:
1601 spin_lock(&xprt->transport_lock);
1602 if (!xprt_test_and_set_connected(xprt)) {
1603
1604
1605 transport->tcp_offset = 0;
1606 transport->tcp_reclen = 0;
1607 transport->tcp_copied = 0;
1608 transport->tcp_flags =
1609 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1610 xprt->connect_cookie++;
1611 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1612 xprt_clear_connecting(xprt);
1613
1614 xprt_wake_pending_tasks(xprt, -EAGAIN);
1615 }
1616 spin_unlock(&xprt->transport_lock);
1617 break;
1618 case TCP_FIN_WAIT1:
1619
1620 xprt->connect_cookie++;
1621 xprt->reestablish_timeout = 0;
1622 set_bit(XPRT_CLOSING, &xprt->state);
1623 smp_mb__before_atomic();
1624 clear_bit(XPRT_CONNECTED, &xprt->state);
1625 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1626 smp_mb__after_atomic();
1627 break;
1628 case TCP_CLOSE_WAIT:
1629
1630 xprt->connect_cookie++;
1631 clear_bit(XPRT_CONNECTED, &xprt->state);
1632 xs_tcp_force_close(xprt);
1633
1634 case TCP_CLOSING:
1635
1636
1637
1638
1639 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1640 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1641 break;
1642 case TCP_LAST_ACK:
1643 set_bit(XPRT_CLOSING, &xprt->state);
1644 smp_mb__before_atomic();
1645 clear_bit(XPRT_CONNECTED, &xprt->state);
1646 smp_mb__after_atomic();
1647 break;
1648 case TCP_CLOSE:
1649 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1650 &transport->sock_state))
1651 xprt_clear_connecting(xprt);
1652 clear_bit(XPRT_CLOSING, &xprt->state);
1653 if (sk->sk_err)
1654 xprt_wake_pending_tasks(xprt, -sk->sk_err);
1655
1656 xs_tcp_force_close(xprt);
1657 }
1658 out:
1659 read_unlock_bh(&sk->sk_callback_lock);
1660}
1661
1662static void xs_write_space(struct sock *sk)
1663{
1664 struct socket_wq *wq;
1665 struct rpc_xprt *xprt;
1666
1667 if (!sk->sk_socket)
1668 return;
1669 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1670
1671 if (unlikely(!(xprt = xprt_from_sock(sk))))
1672 return;
1673 rcu_read_lock();
1674 wq = rcu_dereference(sk->sk_wq);
1675 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1676 goto out;
1677
1678 xprt_write_space(xprt);
1679out:
1680 rcu_read_unlock();
1681}
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693static void xs_udp_write_space(struct sock *sk)
1694{
1695 read_lock_bh(&sk->sk_callback_lock);
1696
1697
1698 if (sock_writeable(sk))
1699 xs_write_space(sk);
1700
1701 read_unlock_bh(&sk->sk_callback_lock);
1702}
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714static void xs_tcp_write_space(struct sock *sk)
1715{
1716 read_lock_bh(&sk->sk_callback_lock);
1717
1718
1719 if (sk_stream_is_writeable(sk))
1720 xs_write_space(sk);
1721
1722 read_unlock_bh(&sk->sk_callback_lock);
1723}
1724
1725static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1726{
1727 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1728 struct sock *sk = transport->inet;
1729
1730 if (transport->rcvsize) {
1731 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1732 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1733 }
1734 if (transport->sndsize) {
1735 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1736 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1737 sk->sk_write_space(sk);
1738 }
1739}
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1750{
1751 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1752
1753 transport->sndsize = 0;
1754 if (sndsize)
1755 transport->sndsize = sndsize + 1024;
1756 transport->rcvsize = 0;
1757 if (rcvsize)
1758 transport->rcvsize = rcvsize + 1024;
1759
1760 xs_udp_do_set_buffer_size(xprt);
1761}
1762
1763
1764
1765
1766
1767
1768
1769static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1770{
1771 spin_lock_bh(&xprt->transport_lock);
1772 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1773 spin_unlock_bh(&xprt->transport_lock);
1774}
1775
1776static unsigned short xs_get_random_port(void)
1777{
1778 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
1779 unsigned short rand = (unsigned short) prandom_u32() % range;
1780 return rand + xprt_min_resvport;
1781}
1782
1783
1784
1785
1786
1787
1788
1789
1790static void xs_sock_set_reuseport(struct socket *sock)
1791{
1792 int opt = 1;
1793
1794 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1795 (char *)&opt, sizeof(opt));
1796}
1797
1798static unsigned short xs_sock_getport(struct socket *sock)
1799{
1800 struct sockaddr_storage buf;
1801 unsigned short port = 0;
1802
1803 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1804 goto out;
1805 switch (buf.ss_family) {
1806 case AF_INET6:
1807 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1808 break;
1809 case AF_INET:
1810 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1811 }
1812out:
1813 return port;
1814}
1815
1816
1817
1818
1819
1820
1821
1822static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1823{
1824 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1825
1826 rpc_set_port(xs_addr(xprt), port);
1827 xs_update_peer_port(xprt);
1828}
1829
1830static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1831{
1832 if (transport->srcport == 0)
1833 transport->srcport = xs_sock_getport(sock);
1834}
1835
1836static unsigned short xs_get_srcport(struct sock_xprt *transport)
1837{
1838 unsigned short port = transport->srcport;
1839
1840 if (port == 0 && transport->xprt.resvport)
1841 port = xs_get_random_port();
1842 return port;
1843}
1844
1845static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1846{
1847 if (transport->srcport != 0)
1848 transport->srcport = 0;
1849 if (!transport->xprt.resvport)
1850 return 0;
1851 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1852 return xprt_max_resvport;
1853 return --port;
1854}
1855static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1856{
1857 struct sockaddr_storage myaddr;
1858 int err, nloop = 0;
1859 unsigned short port = xs_get_srcport(transport);
1860 unsigned short last;
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877 if (port == 0)
1878 return 0;
1879
1880 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1881 do {
1882 rpc_set_port((struct sockaddr *)&myaddr, port);
1883 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1884 transport->xprt.addrlen);
1885 if (err == 0) {
1886 transport->srcport = port;
1887 break;
1888 }
1889 last = port;
1890 port = xs_next_srcport(transport, port);
1891 if (port > last)
1892 nloop++;
1893 } while (err == -EADDRINUSE && nloop != 2);
1894
1895 if (myaddr.ss_family == AF_INET)
1896 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1897 &((struct sockaddr_in *)&myaddr)->sin_addr,
1898 port, err ? "failed" : "ok", err);
1899 else
1900 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1901 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1902 port, err ? "failed" : "ok", err);
1903 return err;
1904}
1905
1906
1907
1908
1909static void xs_local_rpcbind(struct rpc_task *task)
1910{
1911 xprt_set_bound(task->tk_xprt);
1912}
1913
1914static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1915{
1916}
1917
1918#ifdef CONFIG_DEBUG_LOCK_ALLOC
1919static struct lock_class_key xs_key[2];
1920static struct lock_class_key xs_slock_key[2];
1921
1922static inline void xs_reclassify_socketu(struct socket *sock)
1923{
1924 struct sock *sk = sock->sk;
1925
1926 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1927 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1928}
1929
1930static inline void xs_reclassify_socket4(struct socket *sock)
1931{
1932 struct sock *sk = sock->sk;
1933
1934 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1935 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1936}
1937
1938static inline void xs_reclassify_socket6(struct socket *sock)
1939{
1940 struct sock *sk = sock->sk;
1941
1942 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1943 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1944}
1945
1946static inline void xs_reclassify_socket(int family, struct socket *sock)
1947{
1948 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1949 return;
1950
1951 switch (family) {
1952 case AF_LOCAL:
1953 xs_reclassify_socketu(sock);
1954 break;
1955 case AF_INET:
1956 xs_reclassify_socket4(sock);
1957 break;
1958 case AF_INET6:
1959 xs_reclassify_socket6(sock);
1960 break;
1961 }
1962}
1963#else
1964static inline void xs_reclassify_socket(int family, struct socket *sock)
1965{
1966}
1967#endif
1968
1969static void xs_dummy_setup_socket(struct work_struct *work)
1970{
1971}
1972
1973static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1974 struct sock_xprt *transport, int family, int type,
1975 int protocol, bool reuseport)
1976{
1977 struct socket *sock;
1978 int err;
1979
1980 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1981 if (err < 0) {
1982 dprintk("RPC: can't create %d transport socket (%d).\n",
1983 protocol, -err);
1984 goto out;
1985 }
1986 xs_reclassify_socket(family, sock);
1987
1988 if (reuseport)
1989 xs_sock_set_reuseport(sock);
1990
1991 err = xs_bind(transport, sock);
1992 if (err) {
1993 sock_release(sock);
1994 goto out;
1995 }
1996
1997 return sock;
1998out:
1999 return ERR_PTR(err);
2000}
2001
2002static int xs_local_finish_connecting(struct rpc_xprt *xprt,
2003 struct socket *sock)
2004{
2005 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2006 xprt);
2007
2008 if (!transport->inet) {
2009 struct sock *sk = sock->sk;
2010
2011 write_lock_bh(&sk->sk_callback_lock);
2012
2013 xs_save_old_callbacks(transport, sk);
2014
2015 sk->sk_user_data = xprt;
2016 sk->sk_data_ready = xs_data_ready;
2017 sk->sk_write_space = xs_udp_write_space;
2018 sock_set_flag(sk, SOCK_FASYNC);
2019 sk->sk_error_report = xs_error_report;
2020 sk->sk_allocation = GFP_NOIO;
2021
2022 xprt_clear_connected(xprt);
2023
2024
2025 transport->sock = sock;
2026 transport->inet = sk;
2027
2028 write_unlock_bh(&sk->sk_callback_lock);
2029 }
2030
2031
2032 xprt->stat.connect_count++;
2033 xprt->stat.connect_start = jiffies;
2034 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
2035}
2036
2037
2038
2039
2040
2041static int xs_local_setup_socket(struct sock_xprt *transport)
2042{
2043 struct rpc_xprt *xprt = &transport->xprt;
2044 struct socket *sock;
2045 int status = -EIO;
2046
2047 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2048 SOCK_STREAM, 0, &sock, 1);
2049 if (status < 0) {
2050 dprintk("RPC: can't create AF_LOCAL "
2051 "transport socket (%d).\n", -status);
2052 goto out;
2053 }
2054 xs_reclassify_socket(AF_LOCAL, sock);
2055
2056 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2057 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2058
2059 status = xs_local_finish_connecting(xprt, sock);
2060 trace_rpc_socket_connect(xprt, sock, status);
2061 switch (status) {
2062 case 0:
2063 dprintk("RPC: xprt %p connected to %s\n",
2064 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2065 xprt_set_connected(xprt);
2066 case -ENOBUFS:
2067 break;
2068 case -ENOENT:
2069 dprintk("RPC: xprt %p: socket %s does not exist\n",
2070 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2071 break;
2072 case -ECONNREFUSED:
2073 dprintk("RPC: xprt %p: connection refused for %s\n",
2074 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2075 break;
2076 default:
2077 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2078 __func__, -status,
2079 xprt->address_strings[RPC_DISPLAY_ADDR]);
2080 }
2081
2082out:
2083 xprt_clear_connecting(xprt);
2084 xprt_wake_pending_tasks(xprt, status);
2085 return status;
2086}
2087
2088static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2089{
2090 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2091 int ret;
2092
2093 if (RPC_IS_ASYNC(task)) {
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103 rpc_exit(task, -ENOTCONN);
2104 return;
2105 }
2106 ret = xs_local_setup_socket(transport);
2107 if (ret && !RPC_IS_SOFTCONN(task))
2108 msleep_interruptible(15000);
2109}
2110
2111#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2112
2113
2114
2115
2116
2117static void xs_set_memalloc(struct rpc_xprt *xprt)
2118{
2119 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2120 xprt);
2121
2122
2123
2124
2125
2126 if (!transport->inet)
2127 return;
2128 if (atomic_read(&xprt->swapper))
2129 sk_set_memalloc(transport->inet);
2130}
2131
2132
2133
2134
2135
2136
2137
2138
2139static int
2140xs_enable_swap(struct rpc_xprt *xprt)
2141{
2142 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2143
2144 if (atomic_inc_return(&xprt->swapper) != 1)
2145 return 0;
2146 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2147 return -ERESTARTSYS;
2148 if (xs->inet)
2149 sk_set_memalloc(xs->inet);
2150 xprt_release_xprt(xprt, NULL);
2151 return 0;
2152}
2153
2154
2155
2156
2157
2158
2159
2160
2161static void
2162xs_disable_swap(struct rpc_xprt *xprt)
2163{
2164 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2165
2166 if (!atomic_dec_and_test(&xprt->swapper))
2167 return;
2168 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2169 return;
2170 if (xs->inet)
2171 sk_clear_memalloc(xs->inet);
2172 xprt_release_xprt(xprt, NULL);
2173}
2174#else
2175static void xs_set_memalloc(struct rpc_xprt *xprt)
2176{
2177}
2178
2179static int
2180xs_enable_swap(struct rpc_xprt *xprt)
2181{
2182 return -EINVAL;
2183}
2184
2185static void
2186xs_disable_swap(struct rpc_xprt *xprt)
2187{
2188}
2189#endif
2190
2191static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2192{
2193 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2194
2195 if (!transport->inet) {
2196 struct sock *sk = sock->sk;
2197
2198 write_lock_bh(&sk->sk_callback_lock);
2199
2200 xs_save_old_callbacks(transport, sk);
2201
2202 sk->sk_user_data = xprt;
2203 sk->sk_data_ready = xs_data_ready;
2204 sk->sk_write_space = xs_udp_write_space;
2205 sock_set_flag(sk, SOCK_FASYNC);
2206 sk->sk_allocation = GFP_NOIO;
2207
2208 xprt_set_connected(xprt);
2209
2210
2211 transport->sock = sock;
2212 transport->inet = sk;
2213
2214 xs_set_memalloc(xprt);
2215
2216 write_unlock_bh(&sk->sk_callback_lock);
2217 }
2218 xs_udp_do_set_buffer_size(xprt);
2219
2220 xprt->stat.connect_start = jiffies;
2221}
2222
2223static void xs_udp_setup_socket(struct work_struct *work)
2224{
2225 struct sock_xprt *transport =
2226 container_of(work, struct sock_xprt, connect_worker.work);
2227 struct rpc_xprt *xprt = &transport->xprt;
2228 struct socket *sock;
2229 int status = -EIO;
2230
2231 sock = xs_create_sock(xprt, transport,
2232 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2233 IPPROTO_UDP, false);
2234 if (IS_ERR(sock))
2235 goto out;
2236
2237 dprintk("RPC: worker connecting xprt %p via %s to "
2238 "%s (port %s)\n", xprt,
2239 xprt->address_strings[RPC_DISPLAY_PROTO],
2240 xprt->address_strings[RPC_DISPLAY_ADDR],
2241 xprt->address_strings[RPC_DISPLAY_PORT]);
2242
2243 xs_udp_finish_connecting(xprt, sock);
2244 trace_rpc_socket_connect(xprt, sock, 0);
2245 status = 0;
2246out:
2247 xprt_unlock_connect(xprt, transport);
2248 xprt_clear_connecting(xprt);
2249 xprt_wake_pending_tasks(xprt, status);
2250}
2251
2252
2253
2254
2255
2256
2257
2258
2259static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2260{
2261 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2262 struct socket *sock = transport->sock;
2263 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2264
2265 if (sock == NULL)
2266 return;
2267 switch (skst) {
2268 default:
2269 kernel_sock_shutdown(sock, SHUT_RDWR);
2270 trace_rpc_socket_shutdown(xprt, sock);
2271 break;
2272 case TCP_CLOSE:
2273 case TCP_TIME_WAIT:
2274 xs_reset_transport(transport);
2275 }
2276}
2277
2278static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2279 struct socket *sock)
2280{
2281 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2282 unsigned int keepidle;
2283 unsigned int keepcnt;
2284 unsigned int opt_on = 1;
2285 unsigned int timeo;
2286
2287 spin_lock_bh(&xprt->transport_lock);
2288 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2289 keepcnt = xprt->timeout->to_retries + 1;
2290 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2291 (xprt->timeout->to_retries + 1);
2292 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2293 spin_unlock_bh(&xprt->transport_lock);
2294
2295
2296 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2297 (char *)&opt_on, sizeof(opt_on));
2298 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2299 (char *)&keepidle, sizeof(keepidle));
2300 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2301 (char *)&keepidle, sizeof(keepidle));
2302 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2303 (char *)&keepcnt, sizeof(keepcnt));
2304
2305
2306 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2307 (char *)&timeo, sizeof(timeo));
2308}
2309
2310static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2311 unsigned long connect_timeout,
2312 unsigned long reconnect_timeout)
2313{
2314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2315 struct rpc_timeout to;
2316 unsigned long initval;
2317
2318 spin_lock_bh(&xprt->transport_lock);
2319 if (reconnect_timeout < xprt->max_reconnect_timeout)
2320 xprt->max_reconnect_timeout = reconnect_timeout;
2321 if (connect_timeout < xprt->connect_timeout) {
2322 memcpy(&to, xprt->timeout, sizeof(to));
2323 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2324
2325 if (initval < XS_TCP_INIT_REEST_TO << 1)
2326 initval = XS_TCP_INIT_REEST_TO << 1;
2327 to.to_initval = initval;
2328 to.to_maxval = initval;
2329 memcpy(&transport->tcp_timeout, &to,
2330 sizeof(transport->tcp_timeout));
2331 xprt->timeout = &transport->tcp_timeout;
2332 xprt->connect_timeout = connect_timeout;
2333 }
2334 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2335 spin_unlock_bh(&xprt->transport_lock);
2336}
2337
2338static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2339{
2340 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2341 int ret = -ENOTCONN;
2342
2343 if (!transport->inet) {
2344 struct sock *sk = sock->sk;
2345 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2346
2347
2348
2349
2350
2351
2352
2353
2354 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2355 (char *)&addr_pref, sizeof(addr_pref));
2356
2357 xs_tcp_set_socket_timeouts(xprt, sock);
2358
2359 write_lock_bh(&sk->sk_callback_lock);
2360
2361 xs_save_old_callbacks(transport, sk);
2362
2363 sk->sk_user_data = xprt;
2364 sk->sk_data_ready = xs_data_ready;
2365 sk->sk_state_change = xs_tcp_state_change;
2366 sk->sk_write_space = xs_tcp_write_space;
2367 sock_set_flag(sk, SOCK_FASYNC);
2368 sk->sk_error_report = xs_error_report;
2369 sk->sk_allocation = GFP_NOIO;
2370
2371
2372 sock_reset_flag(sk, SOCK_LINGER);
2373 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2374
2375 xprt_clear_connected(xprt);
2376
2377
2378 transport->sock = sock;
2379 transport->inet = sk;
2380
2381 write_unlock_bh(&sk->sk_callback_lock);
2382 }
2383
2384 if (!xprt_bound(xprt))
2385 goto out;
2386
2387 xs_set_memalloc(xprt);
2388
2389
2390 xprt->stat.connect_count++;
2391 xprt->stat.connect_start = jiffies;
2392 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2393 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2394 switch (ret) {
2395 case 0:
2396 xs_set_srcport(transport, sock);
2397
2398 case -EINPROGRESS:
2399
2400 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2401 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2402 break;
2403 case -EADDRNOTAVAIL:
2404
2405 transport->srcport = 0;
2406 }
2407out:
2408 return ret;
2409}
2410
2411
2412
2413
2414
2415
2416static void xs_tcp_setup_socket(struct work_struct *work)
2417{
2418 struct sock_xprt *transport =
2419 container_of(work, struct sock_xprt, connect_worker.work);
2420 struct socket *sock = transport->sock;
2421 struct rpc_xprt *xprt = &transport->xprt;
2422 int status = -EIO;
2423
2424 if (!sock) {
2425 sock = xs_create_sock(xprt, transport,
2426 xs_addr(xprt)->sa_family, SOCK_STREAM,
2427 IPPROTO_TCP, true);
2428 if (IS_ERR(sock)) {
2429 status = PTR_ERR(sock);
2430 goto out;
2431 }
2432 }
2433
2434 dprintk("RPC: worker connecting xprt %p via %s to "
2435 "%s (port %s)\n", xprt,
2436 xprt->address_strings[RPC_DISPLAY_PROTO],
2437 xprt->address_strings[RPC_DISPLAY_ADDR],
2438 xprt->address_strings[RPC_DISPLAY_PORT]);
2439
2440 status = xs_tcp_finish_connecting(xprt, sock);
2441 trace_rpc_socket_connect(xprt, sock, status);
2442 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2443 xprt, -status, xprt_connected(xprt),
2444 sock->sk->sk_state);
2445 switch (status) {
2446 default:
2447 printk("%s: connect returned unhandled error %d\n",
2448 __func__, status);
2449
2450 case -EADDRNOTAVAIL:
2451
2452
2453
2454 xs_tcp_force_close(xprt);
2455 break;
2456 case 0:
2457 case -EINPROGRESS:
2458 case -EALREADY:
2459 xprt_unlock_connect(xprt, transport);
2460 return;
2461 case -EINVAL:
2462
2463
2464
2465 case -ECONNREFUSED:
2466 case -ECONNRESET:
2467 case -ENETDOWN:
2468 case -ENETUNREACH:
2469 case -EHOSTUNREACH:
2470 case -EADDRINUSE:
2471 case -ENOBUFS:
2472
2473
2474
2475
2476
2477 xprt_wake_pending_tasks(xprt, status);
2478 xs_tcp_force_close(xprt);
2479 goto out;
2480 }
2481 status = -EAGAIN;
2482out:
2483 xprt_unlock_connect(xprt, transport);
2484 xprt_clear_connecting(xprt);
2485 xprt_wake_pending_tasks(xprt, status);
2486}
2487
2488static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2489{
2490 unsigned long start, now = jiffies;
2491
2492 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2493 if (time_after(start, now))
2494 return start - now;
2495 return 0;
2496}
2497
2498static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2499{
2500 xprt->reestablish_timeout <<= 1;
2501 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2502 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2503 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2504 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2505}
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2522{
2523 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2524 unsigned long delay = 0;
2525
2526 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2527
2528 if (transport->sock != NULL) {
2529 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2530 "seconds\n",
2531 xprt, xprt->reestablish_timeout / HZ);
2532
2533
2534 xs_reset_transport(transport);
2535
2536 delay = xs_reconnect_delay(xprt);
2537 xs_reconnect_backoff(xprt);
2538
2539 } else
2540 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2541
2542 queue_delayed_work(xprtiod_workqueue,
2543 &transport->connect_worker,
2544 delay);
2545}
2546
2547
2548
2549
2550
2551
2552
2553static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2554{
2555 long idle_time = 0;
2556
2557 if (xprt_connected(xprt))
2558 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2559
2560 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2561 "%llu %llu %lu %llu %llu\n",
2562 xprt->stat.bind_count,
2563 xprt->stat.connect_count,
2564 xprt->stat.connect_time,
2565 idle_time,
2566 xprt->stat.sends,
2567 xprt->stat.recvs,
2568 xprt->stat.bad_xids,
2569 xprt->stat.req_u,
2570 xprt->stat.bklog_u,
2571 xprt->stat.max_slots,
2572 xprt->stat.sending_u,
2573 xprt->stat.pending_u);
2574}
2575
2576
2577
2578
2579
2580
2581
2582static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2583{
2584 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2585
2586 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2587 "%lu %llu %llu\n",
2588 transport->srcport,
2589 xprt->stat.bind_count,
2590 xprt->stat.sends,
2591 xprt->stat.recvs,
2592 xprt->stat.bad_xids,
2593 xprt->stat.req_u,
2594 xprt->stat.bklog_u,
2595 xprt->stat.max_slots,
2596 xprt->stat.sending_u,
2597 xprt->stat.pending_u);
2598}
2599
2600
2601
2602
2603
2604
2605
2606static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2607{
2608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2609 long idle_time = 0;
2610
2611 if (xprt_connected(xprt))
2612 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2613
2614 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2615 "%llu %llu %lu %llu %llu\n",
2616 transport->srcport,
2617 xprt->stat.bind_count,
2618 xprt->stat.connect_count,
2619 xprt->stat.connect_time,
2620 idle_time,
2621 xprt->stat.sends,
2622 xprt->stat.recvs,
2623 xprt->stat.bad_xids,
2624 xprt->stat.req_u,
2625 xprt->stat.bklog_u,
2626 xprt->stat.max_slots,
2627 xprt->stat.sending_u,
2628 xprt->stat.pending_u);
2629}
2630
2631
2632
2633
2634
2635
2636static int bc_malloc(struct rpc_task *task)
2637{
2638 struct rpc_rqst *rqst = task->tk_rqstp;
2639 size_t size = rqst->rq_callsize;
2640 struct page *page;
2641 struct rpc_buffer *buf;
2642
2643 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2644 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2645 size);
2646 return -EINVAL;
2647 }
2648
2649 page = alloc_page(GFP_KERNEL);
2650 if (!page)
2651 return -ENOMEM;
2652
2653 buf = page_address(page);
2654 buf->len = PAGE_SIZE;
2655
2656 rqst->rq_buffer = buf->data;
2657 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2658 return 0;
2659}
2660
2661
2662
2663
2664static void bc_free(struct rpc_task *task)
2665{
2666 void *buffer = task->tk_rqstp->rq_buffer;
2667 struct rpc_buffer *buf;
2668
2669 buf = container_of(buffer, struct rpc_buffer, data);
2670 free_page((unsigned long)buf);
2671}
2672
2673
2674
2675
2676
2677static int bc_sendto(struct rpc_rqst *req)
2678{
2679 int len;
2680 struct xdr_buf *xbufp = &req->rq_snd_buf;
2681 struct rpc_xprt *xprt = req->rq_xprt;
2682 struct sock_xprt *transport =
2683 container_of(xprt, struct sock_xprt, xprt);
2684 struct socket *sock = transport->sock;
2685 unsigned long headoff;
2686 unsigned long tailoff;
2687
2688 xs_encode_stream_record_marker(xbufp);
2689
2690 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2691 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2692 len = svc_send_common(sock, xbufp,
2693 virt_to_page(xbufp->head[0].iov_base), headoff,
2694 xbufp->tail[0].iov_base, tailoff);
2695
2696 if (len != xbufp->len) {
2697 printk(KERN_NOTICE "Error sending entire callback!\n");
2698 len = -EAGAIN;
2699 }
2700
2701 return len;
2702}
2703
2704
2705
2706
2707static int bc_send_request(struct rpc_task *task)
2708{
2709 struct rpc_rqst *req = task->tk_rqstp;
2710 struct svc_xprt *xprt;
2711 int len;
2712
2713 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2714
2715
2716
2717 xprt = req->rq_xprt->bc_xprt;
2718
2719
2720
2721
2722
2723 if (!mutex_trylock(&xprt->xpt_mutex)) {
2724 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2725 if (!mutex_trylock(&xprt->xpt_mutex))
2726 return -EAGAIN;
2727 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2728 }
2729 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2730 len = -ENOTCONN;
2731 else
2732 len = bc_sendto(req);
2733 mutex_unlock(&xprt->xpt_mutex);
2734
2735 if (len > 0)
2736 len = 0;
2737
2738 return len;
2739}
2740
2741
2742
2743
2744
2745static void bc_close(struct rpc_xprt *xprt)
2746{
2747}
2748
2749
2750
2751
2752
2753
2754static void bc_destroy(struct rpc_xprt *xprt)
2755{
2756 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2757
2758 xs_xprt_free(xprt);
2759 module_put(THIS_MODULE);
2760}
2761
2762static const struct rpc_xprt_ops xs_local_ops = {
2763 .reserve_xprt = xprt_reserve_xprt,
2764 .release_xprt = xs_tcp_release_xprt,
2765 .alloc_slot = xprt_alloc_slot,
2766 .rpcbind = xs_local_rpcbind,
2767 .set_port = xs_local_set_port,
2768 .connect = xs_local_connect,
2769 .buf_alloc = rpc_malloc,
2770 .buf_free = rpc_free,
2771 .send_request = xs_local_send_request,
2772 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2773 .close = xs_close,
2774 .destroy = xs_destroy,
2775 .print_stats = xs_local_print_stats,
2776 .enable_swap = xs_enable_swap,
2777 .disable_swap = xs_disable_swap,
2778};
2779
2780static const struct rpc_xprt_ops xs_udp_ops = {
2781 .set_buffer_size = xs_udp_set_buffer_size,
2782 .reserve_xprt = xprt_reserve_xprt_cong,
2783 .release_xprt = xprt_release_xprt_cong,
2784 .alloc_slot = xprt_alloc_slot,
2785 .rpcbind = rpcb_getport_async,
2786 .set_port = xs_set_port,
2787 .connect = xs_connect,
2788 .buf_alloc = rpc_malloc,
2789 .buf_free = rpc_free,
2790 .send_request = xs_udp_send_request,
2791 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2792 .timer = xs_udp_timer,
2793 .release_request = xprt_release_rqst_cong,
2794 .close = xs_close,
2795 .destroy = xs_destroy,
2796 .print_stats = xs_udp_print_stats,
2797 .enable_swap = xs_enable_swap,
2798 .disable_swap = xs_disable_swap,
2799 .inject_disconnect = xs_inject_disconnect,
2800};
2801
2802static const struct rpc_xprt_ops xs_tcp_ops = {
2803 .reserve_xprt = xprt_reserve_xprt,
2804 .release_xprt = xs_tcp_release_xprt,
2805 .alloc_slot = xprt_lock_and_alloc_slot,
2806 .rpcbind = rpcb_getport_async,
2807 .set_port = xs_set_port,
2808 .connect = xs_connect,
2809 .buf_alloc = rpc_malloc,
2810 .buf_free = rpc_free,
2811 .send_request = xs_tcp_send_request,
2812 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2813 .close = xs_tcp_shutdown,
2814 .destroy = xs_destroy,
2815 .set_connect_timeout = xs_tcp_set_connect_timeout,
2816 .print_stats = xs_tcp_print_stats,
2817 .enable_swap = xs_enable_swap,
2818 .disable_swap = xs_disable_swap,
2819 .inject_disconnect = xs_inject_disconnect,
2820#ifdef CONFIG_SUNRPC_BACKCHANNEL
2821 .bc_setup = xprt_setup_bc,
2822 .bc_up = xs_tcp_bc_up,
2823 .bc_maxpayload = xs_tcp_bc_maxpayload,
2824 .bc_free_rqst = xprt_free_bc_rqst,
2825 .bc_destroy = xprt_destroy_bc,
2826#endif
2827};
2828
2829
2830
2831
2832
2833static const struct rpc_xprt_ops bc_tcp_ops = {
2834 .reserve_xprt = xprt_reserve_xprt,
2835 .release_xprt = xprt_release_xprt,
2836 .alloc_slot = xprt_alloc_slot,
2837 .buf_alloc = bc_malloc,
2838 .buf_free = bc_free,
2839 .send_request = bc_send_request,
2840 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2841 .close = bc_close,
2842 .destroy = bc_destroy,
2843 .print_stats = xs_tcp_print_stats,
2844 .enable_swap = xs_enable_swap,
2845 .disable_swap = xs_disable_swap,
2846 .inject_disconnect = xs_inject_disconnect,
2847};
2848
2849static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2850{
2851 static const struct sockaddr_in sin = {
2852 .sin_family = AF_INET,
2853 .sin_addr.s_addr = htonl(INADDR_ANY),
2854 };
2855 static const struct sockaddr_in6 sin6 = {
2856 .sin6_family = AF_INET6,
2857 .sin6_addr = IN6ADDR_ANY_INIT,
2858 };
2859
2860 switch (family) {
2861 case AF_LOCAL:
2862 break;
2863 case AF_INET:
2864 memcpy(sap, &sin, sizeof(sin));
2865 break;
2866 case AF_INET6:
2867 memcpy(sap, &sin6, sizeof(sin6));
2868 break;
2869 default:
2870 dprintk("RPC: %s: Bad address family\n", __func__);
2871 return -EAFNOSUPPORT;
2872 }
2873 return 0;
2874}
2875
2876static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2877 unsigned int slot_table_size,
2878 unsigned int max_slot_table_size)
2879{
2880 struct rpc_xprt *xprt;
2881 struct sock_xprt *new;
2882
2883 if (args->addrlen > sizeof(xprt->addr)) {
2884 dprintk("RPC: xs_setup_xprt: address too large\n");
2885 return ERR_PTR(-EBADF);
2886 }
2887
2888 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2889 max_slot_table_size);
2890 if (xprt == NULL) {
2891 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2892 "rpc_xprt\n");
2893 return ERR_PTR(-ENOMEM);
2894 }
2895
2896 new = container_of(xprt, struct sock_xprt, xprt);
2897 mutex_init(&new->recv_mutex);
2898 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2899 xprt->addrlen = args->addrlen;
2900 if (args->srcaddr)
2901 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2902 else {
2903 int err;
2904 err = xs_init_anyaddr(args->dstaddr->sa_family,
2905 (struct sockaddr *)&new->srcaddr);
2906 if (err != 0) {
2907 xprt_free(xprt);
2908 return ERR_PTR(err);
2909 }
2910 }
2911
2912 return xprt;
2913}
2914
2915static const struct rpc_timeout xs_local_default_timeout = {
2916 .to_initval = 10 * HZ,
2917 .to_maxval = 10 * HZ,
2918 .to_retries = 2,
2919};
2920
2921
2922
2923
2924
2925
2926
2927static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2928{
2929 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2930 struct sock_xprt *transport;
2931 struct rpc_xprt *xprt;
2932 struct rpc_xprt *ret;
2933
2934 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2935 xprt_max_tcp_slot_table_entries);
2936 if (IS_ERR(xprt))
2937 return xprt;
2938 transport = container_of(xprt, struct sock_xprt, xprt);
2939
2940 xprt->prot = 0;
2941 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2942 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2943
2944 xprt->bind_timeout = XS_BIND_TO;
2945 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2946 xprt->idle_timeout = XS_IDLE_DISC_TO;
2947
2948 xprt->ops = &xs_local_ops;
2949 xprt->timeout = &xs_local_default_timeout;
2950
2951 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2952 INIT_DELAYED_WORK(&transport->connect_worker,
2953 xs_dummy_setup_socket);
2954
2955 switch (sun->sun_family) {
2956 case AF_LOCAL:
2957 if (sun->sun_path[0] != '/') {
2958 dprintk("RPC: bad AF_LOCAL address: %s\n",
2959 sun->sun_path);
2960 ret = ERR_PTR(-EINVAL);
2961 goto out_err;
2962 }
2963 xprt_set_bound(xprt);
2964 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2965 ret = ERR_PTR(xs_local_setup_socket(transport));
2966 if (ret)
2967 goto out_err;
2968 break;
2969 default:
2970 ret = ERR_PTR(-EAFNOSUPPORT);
2971 goto out_err;
2972 }
2973
2974 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2975 xprt->address_strings[RPC_DISPLAY_ADDR]);
2976
2977 if (try_module_get(THIS_MODULE))
2978 return xprt;
2979 ret = ERR_PTR(-EINVAL);
2980out_err:
2981 xs_xprt_free(xprt);
2982 return ret;
2983}
2984
2985static const struct rpc_timeout xs_udp_default_timeout = {
2986 .to_initval = 5 * HZ,
2987 .to_maxval = 30 * HZ,
2988 .to_increment = 5 * HZ,
2989 .to_retries = 5,
2990};
2991
2992
2993
2994
2995
2996
2997static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2998{
2999 struct sockaddr *addr = args->dstaddr;
3000 struct rpc_xprt *xprt;
3001 struct sock_xprt *transport;
3002 struct rpc_xprt *ret;
3003
3004 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3005 xprt_udp_slot_table_entries);
3006 if (IS_ERR(xprt))
3007 return xprt;
3008 transport = container_of(xprt, struct sock_xprt, xprt);
3009
3010 xprt->prot = IPPROTO_UDP;
3011 xprt->tsh_size = 0;
3012
3013 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3014
3015 xprt->bind_timeout = XS_BIND_TO;
3016 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3017 xprt->idle_timeout = XS_IDLE_DISC_TO;
3018
3019 xprt->ops = &xs_udp_ops;
3020
3021 xprt->timeout = &xs_udp_default_timeout;
3022
3023 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3024 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3025
3026 switch (addr->sa_family) {
3027 case AF_INET:
3028 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3029 xprt_set_bound(xprt);
3030
3031 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3032 break;
3033 case AF_INET6:
3034 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3035 xprt_set_bound(xprt);
3036
3037 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3038 break;
3039 default:
3040 ret = ERR_PTR(-EAFNOSUPPORT);
3041 goto out_err;
3042 }
3043
3044 if (xprt_bound(xprt))
3045 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3046 xprt->address_strings[RPC_DISPLAY_ADDR],
3047 xprt->address_strings[RPC_DISPLAY_PORT],
3048 xprt->address_strings[RPC_DISPLAY_PROTO]);
3049 else
3050 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3051 xprt->address_strings[RPC_DISPLAY_ADDR],
3052 xprt->address_strings[RPC_DISPLAY_PROTO]);
3053
3054 if (try_module_get(THIS_MODULE))
3055 return xprt;
3056 ret = ERR_PTR(-EINVAL);
3057out_err:
3058 xs_xprt_free(xprt);
3059 return ret;
3060}
3061
3062static const struct rpc_timeout xs_tcp_default_timeout = {
3063 .to_initval = 60 * HZ,
3064 .to_maxval = 60 * HZ,
3065 .to_retries = 2,
3066};
3067
3068
3069
3070
3071
3072
3073static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3074{
3075 struct sockaddr *addr = args->dstaddr;
3076 struct rpc_xprt *xprt;
3077 struct sock_xprt *transport;
3078 struct rpc_xprt *ret;
3079 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3080
3081 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3082 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3083
3084 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3085 max_slot_table_size);
3086 if (IS_ERR(xprt))
3087 return xprt;
3088 transport = container_of(xprt, struct sock_xprt, xprt);
3089
3090 xprt->prot = IPPROTO_TCP;
3091 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3092 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3093
3094 xprt->bind_timeout = XS_BIND_TO;
3095 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3096 xprt->idle_timeout = XS_IDLE_DISC_TO;
3097
3098 xprt->ops = &xs_tcp_ops;
3099 xprt->timeout = &xs_tcp_default_timeout;
3100
3101 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3102 xprt->connect_timeout = xprt->timeout->to_initval *
3103 (xprt->timeout->to_retries + 1);
3104
3105 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
3106 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3107
3108 switch (addr->sa_family) {
3109 case AF_INET:
3110 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3111 xprt_set_bound(xprt);
3112
3113 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3114 break;
3115 case AF_INET6:
3116 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3117 xprt_set_bound(xprt);
3118
3119 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3120 break;
3121 default:
3122 ret = ERR_PTR(-EAFNOSUPPORT);
3123 goto out_err;
3124 }
3125
3126 if (xprt_bound(xprt))
3127 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3128 xprt->address_strings[RPC_DISPLAY_ADDR],
3129 xprt->address_strings[RPC_DISPLAY_PORT],
3130 xprt->address_strings[RPC_DISPLAY_PROTO]);
3131 else
3132 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3133 xprt->address_strings[RPC_DISPLAY_ADDR],
3134 xprt->address_strings[RPC_DISPLAY_PROTO]);
3135
3136 if (try_module_get(THIS_MODULE))
3137 return xprt;
3138 ret = ERR_PTR(-EINVAL);
3139out_err:
3140 xs_xprt_free(xprt);
3141 return ret;
3142}
3143
3144
3145
3146
3147
3148
3149static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3150{
3151 struct sockaddr *addr = args->dstaddr;
3152 struct rpc_xprt *xprt;
3153 struct sock_xprt *transport;
3154 struct svc_sock *bc_sock;
3155 struct rpc_xprt *ret;
3156
3157 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3158 xprt_tcp_slot_table_entries);
3159 if (IS_ERR(xprt))
3160 return xprt;
3161 transport = container_of(xprt, struct sock_xprt, xprt);
3162
3163 xprt->prot = IPPROTO_TCP;
3164 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3165 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3166 xprt->timeout = &xs_tcp_default_timeout;
3167
3168
3169 xprt_set_bound(xprt);
3170 xprt->bind_timeout = 0;
3171 xprt->reestablish_timeout = 0;
3172 xprt->idle_timeout = 0;
3173
3174 xprt->ops = &bc_tcp_ops;
3175
3176 switch (addr->sa_family) {
3177 case AF_INET:
3178 xs_format_peer_addresses(xprt, "tcp",
3179 RPCBIND_NETID_TCP);
3180 break;
3181 case AF_INET6:
3182 xs_format_peer_addresses(xprt, "tcp",
3183 RPCBIND_NETID_TCP6);
3184 break;
3185 default:
3186 ret = ERR_PTR(-EAFNOSUPPORT);
3187 goto out_err;
3188 }
3189
3190 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3191 xprt->address_strings[RPC_DISPLAY_ADDR],
3192 xprt->address_strings[RPC_DISPLAY_PORT],
3193 xprt->address_strings[RPC_DISPLAY_PROTO]);
3194
3195
3196
3197
3198
3199
3200
3201 xprt_get(xprt);
3202 args->bc_xprt->xpt_bc_xprt = xprt;
3203 xprt->bc_xprt = args->bc_xprt;
3204 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3205 transport->sock = bc_sock->sk_sock;
3206 transport->inet = bc_sock->sk_sk;
3207
3208
3209
3210
3211
3212 xprt_set_connected(xprt);
3213
3214 if (try_module_get(THIS_MODULE))
3215 return xprt;
3216
3217 args->bc_xprt->xpt_bc_xprt = NULL;
3218 args->bc_xprt->xpt_bc_xps = NULL;
3219 xprt_put(xprt);
3220 ret = ERR_PTR(-EINVAL);
3221out_err:
3222 xs_xprt_free(xprt);
3223 return ret;
3224}
3225
3226static struct xprt_class xs_local_transport = {
3227 .list = LIST_HEAD_INIT(xs_local_transport.list),
3228 .name = "named UNIX socket",
3229 .owner = THIS_MODULE,
3230 .ident = XPRT_TRANSPORT_LOCAL,
3231 .setup = xs_setup_local,
3232};
3233
3234static struct xprt_class xs_udp_transport = {
3235 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3236 .name = "udp",
3237 .owner = THIS_MODULE,
3238 .ident = XPRT_TRANSPORT_UDP,
3239 .setup = xs_setup_udp,
3240};
3241
3242static struct xprt_class xs_tcp_transport = {
3243 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3244 .name = "tcp",
3245 .owner = THIS_MODULE,
3246 .ident = XPRT_TRANSPORT_TCP,
3247 .setup = xs_setup_tcp,
3248};
3249
3250static struct xprt_class xs_bc_tcp_transport = {
3251 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3252 .name = "tcp NFSv4.1 backchannel",
3253 .owner = THIS_MODULE,
3254 .ident = XPRT_TRANSPORT_BC_TCP,
3255 .setup = xs_setup_bc_tcp,
3256};
3257
3258
3259
3260
3261
3262int init_socket_xprt(void)
3263{
3264#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3265 if (!sunrpc_table_header)
3266 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3267#endif
3268
3269 xprt_register_transport(&xs_local_transport);
3270 xprt_register_transport(&xs_udp_transport);
3271 xprt_register_transport(&xs_tcp_transport);
3272 xprt_register_transport(&xs_bc_tcp_transport);
3273
3274 return 0;
3275}
3276
3277
3278
3279
3280
3281void cleanup_socket_xprt(void)
3282{
3283#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3284 if (sunrpc_table_header) {
3285 unregister_sysctl_table(sunrpc_table_header);
3286 sunrpc_table_header = NULL;
3287 }
3288#endif
3289
3290 xprt_unregister_transport(&xs_local_transport);
3291 xprt_unregister_transport(&xs_udp_transport);
3292 xprt_unregister_transport(&xs_tcp_transport);
3293 xprt_unregister_transport(&xs_bc_tcp_transport);
3294}
3295
3296static int param_set_uint_minmax(const char *val,
3297 const struct kernel_param *kp,
3298 unsigned int min, unsigned int max)
3299{
3300 unsigned int num;
3301 int ret;
3302
3303 if (!val)
3304 return -EINVAL;
3305 ret = kstrtouint(val, 0, &num);
3306 if (ret)
3307 return ret;
3308 if (num < min || num > max)
3309 return -EINVAL;
3310 *((unsigned int *)kp->arg) = num;
3311 return 0;
3312}
3313
3314static int param_set_portnr(const char *val, const struct kernel_param *kp)
3315{
3316 if (kp->arg == &xprt_min_resvport)
3317 return param_set_uint_minmax(val, kp,
3318 RPC_MIN_RESVPORT,
3319 xprt_max_resvport);
3320 return param_set_uint_minmax(val, kp,
3321 xprt_min_resvport,
3322 RPC_MAX_RESVPORT);
3323}
3324
3325static const struct kernel_param_ops param_ops_portnr = {
3326 .set = param_set_portnr,
3327 .get = param_get_uint,
3328};
3329
3330#define param_check_portnr(name, p) \
3331 __param_check(name, p, unsigned int);
3332
3333module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3334module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3335
3336static int param_set_slot_table_size(const char *val,
3337 const struct kernel_param *kp)
3338{
3339 return param_set_uint_minmax(val, kp,
3340 RPC_MIN_SLOT_TABLE,
3341 RPC_MAX_SLOT_TABLE);
3342}
3343
3344static const struct kernel_param_ops param_ops_slot_table_size = {
3345 .set = param_set_slot_table_size,
3346 .get = param_get_uint,
3347};
3348
3349#define param_check_slot_table_size(name, p) \
3350 __param_check(name, p, unsigned int);
3351
3352static int param_set_max_slot_table_size(const char *val,
3353 const struct kernel_param *kp)
3354{
3355 return param_set_uint_minmax(val, kp,
3356 RPC_MIN_SLOT_TABLE,
3357 RPC_MAX_SLOT_TABLE_LIMIT);
3358}
3359
3360static const struct kernel_param_ops param_ops_max_slot_table_size = {
3361 .set = param_set_max_slot_table_size,
3362 .get = param_get_uint,
3363};
3364
3365#define param_check_max_slot_table_size(name, p) \
3366 __param_check(name, p, unsigned int);
3367
3368module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3369 slot_table_size, 0644);
3370module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3371 max_slot_table_size, 0644);
3372module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3373 slot_table_size, 0644);
3374
3375