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21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/capability.h>
26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
32#include <linux/un.h>
33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
36#include <linux/sunrpc/addr.h>
37#include <linux/sunrpc/sched.h>
38#include <linux/sunrpc/svcsock.h>
39#include <linux/sunrpc/xprtsock.h>
40#include <linux/file.h>
41#ifdef CONFIG_SUNRPC_BACKCHANNEL
42#include <linux/sunrpc/bc_xprt.h>
43#endif
44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
50#include <trace/events/sunrpc.h>
51
52#include "sunrpc.h"
53
54static void xs_close(struct rpc_xprt *xprt);
55
56
57
58
59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
65
66#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
67
68#define XS_TCP_LINGER_TO (15U * HZ)
69static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
70
71
72
73
74
75
76
77
78
79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88
89
90
91
92static struct ctl_table xs_tunables_table[] = {
93 {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
120 {
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_jiffies,
144 },
145 { },
146};
147
148static struct ctl_table sunrpc_table[] = {
149 {
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
154 { },
155};
156
157#endif
158
159
160
161
162#define XS_BIND_TO (60U * HZ)
163
164
165
166
167
168#define XS_UDP_REEST_TO (2U * HZ)
169
170
171
172
173
174
175
176
177
178
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182
183
184
185
186
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
189#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
190# undef RPC_DEBUG_DATA
191# define RPCDBG_FACILITY RPCDBG_TRANS
192#endif
193
194#ifdef RPC_DEBUG_DATA
195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196{
197 u8 *buf = (u8 *) packet;
198 int j;
199
200 dprintk("RPC: %s\n", msg);
201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214{
215
216}
217#endif
218
219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220{
221 return (struct rpc_xprt *) sk->sk_user_data;
222}
223
224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225{
226 return (struct sockaddr *) &xprt->addr;
227}
228
229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230{
231 return (struct sockaddr_un *) &xprt->addr;
232}
233
234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
235{
236 return (struct sockaddr_in *) &xprt->addr;
237}
238
239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_in6 *) &xprt->addr;
242}
243
244static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
245{
246 struct sockaddr *sap = xs_addr(xprt);
247 struct sockaddr_in6 *sin6;
248 struct sockaddr_in *sin;
249 struct sockaddr_un *sun;
250 char buf[128];
251
252 switch (sap->sa_family) {
253 case AF_LOCAL:
254 sun = xs_addr_un(xprt);
255 strlcpy(buf, sun->sun_path, sizeof(buf));
256 xprt->address_strings[RPC_DISPLAY_ADDR] =
257 kstrdup(buf, GFP_KERNEL);
258 break;
259 case AF_INET:
260 (void)rpc_ntop(sap, buf, sizeof(buf));
261 xprt->address_strings[RPC_DISPLAY_ADDR] =
262 kstrdup(buf, GFP_KERNEL);
263 sin = xs_addr_in(xprt);
264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
265 break;
266 case AF_INET6:
267 (void)rpc_ntop(sap, buf, sizeof(buf));
268 xprt->address_strings[RPC_DISPLAY_ADDR] =
269 kstrdup(buf, GFP_KERNEL);
270 sin6 = xs_addr_in6(xprt);
271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
272 break;
273 default:
274 BUG();
275 }
276
277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
278}
279
280static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
281{
282 struct sockaddr *sap = xs_addr(xprt);
283 char buf[128];
284
285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
287
288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
290}
291
292static void xs_format_peer_addresses(struct rpc_xprt *xprt,
293 const char *protocol,
294 const char *netid)
295{
296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
297 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
298 xs_format_common_peer_addresses(xprt);
299 xs_format_common_peer_ports(xprt);
300}
301
302static void xs_update_peer_port(struct rpc_xprt *xprt)
303{
304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
306
307 xs_format_common_peer_ports(xprt);
308}
309
310static void xs_free_peer_addresses(struct rpc_xprt *xprt)
311{
312 unsigned int i;
313
314 for (i = 0; i < RPC_DISPLAY_MAX; i++)
315 switch (i) {
316 case RPC_DISPLAY_PROTO:
317 case RPC_DISPLAY_NETID:
318 continue;
319 default:
320 kfree(xprt->address_strings[i]);
321 }
322}
323
324#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
325
326static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
327{
328 struct msghdr msg = {
329 .msg_name = addr,
330 .msg_namelen = addrlen,
331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
332 };
333 struct kvec iov = {
334 .iov_base = vec->iov_base + base,
335 .iov_len = vec->iov_len - base,
336 };
337
338 if (iov.iov_len != 0)
339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
340 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
341}
342
343static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
344{
345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
346 int offset, size_t size, int flags);
347 struct page **ppage;
348 unsigned int remainder;
349 int err;
350
351 remainder = xdr->page_len - base;
352 base += xdr->page_base;
353 ppage = xdr->pages + (base >> PAGE_SHIFT);
354 base &= ~PAGE_MASK;
355 do_sendpage = sock->ops->sendpage;
356 if (!zerocopy)
357 do_sendpage = sock_no_sendpage;
358 for(;;) {
359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
360 int flags = XS_SENDMSG_FLAGS;
361
362 remainder -= len;
363 if (more)
364 flags |= MSG_MORE;
365 if (remainder != 0)
366 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
367 err = do_sendpage(sock, *ppage, base, len, flags);
368 if (remainder == 0 || err != len)
369 break;
370 *sent_p += err;
371 ppage++;
372 base = 0;
373 }
374 if (err > 0) {
375 *sent_p += err;
376 err = 0;
377 }
378 return err;
379}
380
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389
390
391
392static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
393{
394 unsigned int remainder = xdr->len - base;
395 int err = 0;
396 int sent = 0;
397
398 if (unlikely(!sock))
399 return -ENOTSOCK;
400
401 if (base != 0) {
402 addr = NULL;
403 addrlen = 0;
404 }
405
406 if (base < xdr->head[0].iov_len || addr != NULL) {
407 unsigned int len = xdr->head[0].iov_len - base;
408 remainder -= len;
409 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
410 if (remainder == 0 || err != len)
411 goto out;
412 *sent_p += err;
413 base = 0;
414 } else
415 base -= xdr->head[0].iov_len;
416
417 if (base < xdr->page_len) {
418 unsigned int len = xdr->page_len - base;
419 remainder -= len;
420 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
421 *sent_p += sent;
422 if (remainder == 0 || sent != len)
423 goto out;
424 base = 0;
425 } else
426 base -= xdr->page_len;
427
428 if (base >= xdr->tail[0].iov_len)
429 return 0;
430 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
431out:
432 if (err > 0) {
433 *sent_p += err;
434 err = 0;
435 }
436 return err;
437}
438
439static void xs_nospace_callback(struct rpc_task *task)
440{
441 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
442
443 transport->inet->sk_write_pending--;
444}
445
446
447
448
449
450
451static int xs_nospace(struct rpc_task *task)
452{
453 struct rpc_rqst *req = task->tk_rqstp;
454 struct rpc_xprt *xprt = req->rq_xprt;
455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
456 struct sock *sk = transport->inet;
457 int ret = -EAGAIN;
458
459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
460 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
461 req->rq_slen);
462
463
464 spin_lock_bh(&xprt->transport_lock);
465
466
467 if (xprt_connected(xprt)) {
468
469 sk->sk_write_pending++;
470 xprt_wait_for_buffer_space(task, xs_nospace_callback);
471 } else
472 ret = -ENOTCONN;
473
474 spin_unlock_bh(&xprt->transport_lock);
475
476
477 sk->sk_write_space(sk);
478 return ret;
479}
480
481
482
483
484static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
485{
486 u32 reclen = buf->len - sizeof(rpc_fraghdr);
487 rpc_fraghdr *base = buf->head[0].iov_base;
488 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
489}
490
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494
495
496
497
498
499
500
501
502static int xs_local_send_request(struct rpc_task *task)
503{
504 struct rpc_rqst *req = task->tk_rqstp;
505 struct rpc_xprt *xprt = req->rq_xprt;
506 struct sock_xprt *transport =
507 container_of(xprt, struct sock_xprt, xprt);
508 struct xdr_buf *xdr = &req->rq_snd_buf;
509 int status;
510 int sent = 0;
511
512 xs_encode_stream_record_marker(&req->rq_snd_buf);
513
514 xs_pktdump("packet data:",
515 req->rq_svec->iov_base, req->rq_svec->iov_len);
516
517 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
518 true, &sent);
519 dprintk("RPC: %s(%u) = %d\n",
520 __func__, xdr->len - req->rq_bytes_sent, status);
521
522 if (status == -EAGAIN && sock_writeable(transport->inet))
523 status = -ENOBUFS;
524
525 if (likely(sent > 0) || status == 0) {
526 req->rq_bytes_sent += sent;
527 req->rq_xmit_bytes_sent += sent;
528 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
529 req->rq_bytes_sent = 0;
530 return 0;
531 }
532 status = -EAGAIN;
533 }
534
535 switch (status) {
536 case -ENOBUFS:
537 break;
538 case -EAGAIN:
539 status = xs_nospace(task);
540 break;
541 default:
542 dprintk("RPC: sendmsg returned unrecognized error %d\n",
543 -status);
544 case -EPIPE:
545 xs_close(xprt);
546 status = -ENOTCONN;
547 }
548
549 return status;
550}
551
552
553
554
555
556
557
558
559
560
561
562
563static int xs_udp_send_request(struct rpc_task *task)
564{
565 struct rpc_rqst *req = task->tk_rqstp;
566 struct rpc_xprt *xprt = req->rq_xprt;
567 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
568 struct xdr_buf *xdr = &req->rq_snd_buf;
569 int sent = 0;
570 int status;
571
572 xs_pktdump("packet data:",
573 req->rq_svec->iov_base,
574 req->rq_svec->iov_len);
575
576 if (!xprt_bound(xprt))
577 return -ENOTCONN;
578 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
579 xdr, req->rq_bytes_sent, true, &sent);
580
581 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
582 xdr->len - req->rq_bytes_sent, status);
583
584
585 if (status == -EPERM)
586 goto process_status;
587
588 if (status == -EAGAIN && sock_writeable(transport->inet))
589 status = -ENOBUFS;
590
591 if (sent > 0 || status == 0) {
592 req->rq_xmit_bytes_sent += sent;
593 if (sent >= req->rq_slen)
594 return 0;
595
596 status = -EAGAIN;
597 }
598
599process_status:
600 switch (status) {
601 case -ENOTSOCK:
602 status = -ENOTCONN;
603
604 break;
605 case -EAGAIN:
606 status = xs_nospace(task);
607 break;
608 case -ENETUNREACH:
609 case -ENOBUFS:
610 case -EPIPE:
611 case -ECONNREFUSED:
612 case -EPERM:
613
614
615 break;
616 default:
617 dprintk("RPC: sendmsg returned unrecognized error %d\n",
618 -status);
619 }
620
621 return status;
622}
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638static int xs_tcp_send_request(struct rpc_task *task)
639{
640 struct rpc_rqst *req = task->tk_rqstp;
641 struct rpc_xprt *xprt = req->rq_xprt;
642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
643 struct xdr_buf *xdr = &req->rq_snd_buf;
644 bool zerocopy = true;
645 int status;
646 int sent;
647
648 xs_encode_stream_record_marker(&req->rq_snd_buf);
649
650 xs_pktdump("packet data:",
651 req->rq_svec->iov_base,
652 req->rq_svec->iov_len);
653
654
655
656
657 if (task->tk_flags & RPC_TASK_SENT)
658 zerocopy = false;
659
660
661
662
663 while (1) {
664 sent = 0;
665 status = xs_sendpages(transport->sock, NULL, 0, xdr,
666 req->rq_bytes_sent, zerocopy, &sent);
667
668 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
669 xdr->len - req->rq_bytes_sent, status);
670
671
672
673 req->rq_bytes_sent += sent;
674 req->rq_xmit_bytes_sent += sent;
675 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676 req->rq_bytes_sent = 0;
677 return 0;
678 }
679
680 if (status < 0)
681 break;
682 if (sent == 0) {
683 status = -EAGAIN;
684 break;
685 }
686 }
687 if (status == -EAGAIN && sk_stream_is_writeable(transport->inet))
688 status = -ENOBUFS;
689
690 switch (status) {
691 case -ENOTSOCK:
692 status = -ENOTCONN;
693
694 break;
695 case -EAGAIN:
696 status = xs_nospace(task);
697 break;
698 case -ECONNRESET:
699 case -ECONNREFUSED:
700 case -ENOTCONN:
701 case -EADDRINUSE:
702 case -ENOBUFS:
703 case -EPIPE:
704 break;
705 default:
706 dprintk("RPC: sendmsg returned unrecognized error %d\n",
707 -status);
708 }
709
710 return status;
711}
712
713
714
715
716
717
718
719
720
721
722static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
723{
724 struct rpc_rqst *req;
725
726 if (task != xprt->snd_task)
727 return;
728 if (task == NULL)
729 goto out_release;
730 req = task->tk_rqstp;
731 if (req == NULL)
732 goto out_release;
733 if (req->rq_bytes_sent == 0)
734 goto out_release;
735 if (req->rq_bytes_sent == req->rq_snd_buf.len)
736 goto out_release;
737 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
738out_release:
739 xprt_release_xprt(xprt, task);
740}
741
742static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
743{
744 transport->old_data_ready = sk->sk_data_ready;
745 transport->old_state_change = sk->sk_state_change;
746 transport->old_write_space = sk->sk_write_space;
747 transport->old_error_report = sk->sk_error_report;
748}
749
750static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
751{
752 sk->sk_data_ready = transport->old_data_ready;
753 sk->sk_state_change = transport->old_state_change;
754 sk->sk_write_space = transport->old_write_space;
755 sk->sk_error_report = transport->old_error_report;
756}
757
758static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
759{
760 smp_mb__before_atomic();
761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
762 clear_bit(XPRT_CLOSING, &xprt->state);
763 smp_mb__after_atomic();
764}
765
766static void xs_sock_mark_closed(struct rpc_xprt *xprt)
767{
768 xs_sock_reset_connection_flags(xprt);
769
770 xprt_disconnect_done(xprt);
771}
772
773
774
775
776
777
778
779
780static void xs_error_report(struct sock *sk)
781{
782 struct rpc_xprt *xprt;
783 int err;
784
785 read_lock_bh(&sk->sk_callback_lock);
786 if (!(xprt = xprt_from_sock(sk)))
787 goto out;
788
789 err = -sk->sk_err;
790 if (err == 0)
791 goto out;
792
793 if (sk->sk_state == TCP_CLOSE)
794 xs_sock_mark_closed(xprt);
795 dprintk("RPC: xs_error_report client %p, error=%d...\n",
796 xprt, -err);
797 trace_rpc_socket_error(xprt, sk->sk_socket, err);
798 xprt_wake_pending_tasks(xprt, err);
799 out:
800 read_unlock_bh(&sk->sk_callback_lock);
801}
802
803static void xs_reset_transport(struct sock_xprt *transport)
804{
805 struct socket *sock = transport->sock;
806 struct sock *sk = transport->inet;
807 struct rpc_xprt *xprt = &transport->xprt;
808
809 if (sk == NULL)
810 return;
811
812 if (atomic_read(&transport->xprt.swapper))
813 sk_clear_memalloc(sk);
814
815 kernel_sock_shutdown(sock, SHUT_RDWR);
816
817 mutex_lock(&transport->recv_mutex);
818 write_lock_bh(&sk->sk_callback_lock);
819 transport->inet = NULL;
820 transport->sock = NULL;
821
822 sk->sk_user_data = NULL;
823
824 xs_restore_old_callbacks(transport, sk);
825 xprt_clear_connected(xprt);
826 write_unlock_bh(&sk->sk_callback_lock);
827 xs_sock_reset_connection_flags(xprt);
828 mutex_unlock(&transport->recv_mutex);
829
830 trace_rpc_socket_close(xprt, sock);
831 sock_release(sock);
832}
833
834
835
836
837
838
839
840
841
842
843
844static void xs_close(struct rpc_xprt *xprt)
845{
846 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
847
848 dprintk("RPC: xs_close xprt %p\n", xprt);
849
850 xs_reset_transport(transport);
851 xprt->reestablish_timeout = 0;
852
853 xprt_disconnect_done(xprt);
854}
855
856static void xs_inject_disconnect(struct rpc_xprt *xprt)
857{
858 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
859 xprt);
860 xprt_disconnect_done(xprt);
861}
862
863static void xs_xprt_free(struct rpc_xprt *xprt)
864{
865 xs_free_peer_addresses(xprt);
866 xprt_free(xprt);
867}
868
869
870
871
872
873
874static void xs_destroy(struct rpc_xprt *xprt)
875{
876 struct sock_xprt *transport = container_of(xprt,
877 struct sock_xprt, xprt);
878 dprintk("RPC: xs_destroy xprt %p\n", xprt);
879
880 cancel_delayed_work_sync(&transport->connect_worker);
881 xs_close(xprt);
882 cancel_work_sync(&transport->recv_worker);
883 xs_xprt_free(xprt);
884 module_put(THIS_MODULE);
885}
886
887static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
888{
889 struct xdr_skb_reader desc = {
890 .skb = skb,
891 .offset = sizeof(rpc_fraghdr),
892 .count = skb->len - sizeof(rpc_fraghdr),
893 };
894
895 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
896 return -1;
897 if (desc.count)
898 return -1;
899 return 0;
900}
901
902
903
904
905
906
907
908
909
910static void xs_local_data_read_skb(struct rpc_xprt *xprt,
911 struct sock *sk,
912 struct sk_buff *skb)
913{
914 struct rpc_task *task;
915 struct rpc_rqst *rovr;
916 int repsize, copied;
917 u32 _xid;
918 __be32 *xp;
919
920 repsize = skb->len - sizeof(rpc_fraghdr);
921 if (repsize < 4) {
922 dprintk("RPC: impossible RPC reply size %d\n", repsize);
923 return;
924 }
925
926
927 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
928 if (xp == NULL)
929 return;
930
931
932 spin_lock_bh(&xprt->transport_lock);
933 rovr = xprt_lookup_rqst(xprt, *xp);
934 if (!rovr)
935 goto out_unlock;
936 task = rovr->rq_task;
937
938 copied = rovr->rq_private_buf.buflen;
939 if (copied > repsize)
940 copied = repsize;
941
942 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
943 dprintk("RPC: sk_buff copy failed\n");
944 goto out_unlock;
945 }
946
947 xprt_complete_rqst(task, copied);
948
949 out_unlock:
950 spin_unlock_bh(&xprt->transport_lock);
951}
952
953static void xs_local_data_receive(struct sock_xprt *transport)
954{
955 struct sk_buff *skb;
956 struct sock *sk;
957 int err;
958
959 mutex_lock(&transport->recv_mutex);
960 sk = transport->inet;
961 if (sk == NULL)
962 goto out;
963 for (;;) {
964 skb = skb_recv_datagram(sk, 0, 1, &err);
965 if (skb == NULL)
966 break;
967 xs_local_data_read_skb(&transport->xprt, sk, skb);
968 skb_free_datagram(sk, skb);
969 }
970out:
971 mutex_unlock(&transport->recv_mutex);
972}
973
974static void xs_local_data_receive_workfn(struct work_struct *work)
975{
976 struct sock_xprt *transport =
977 container_of(work, struct sock_xprt, recv_worker);
978 xs_local_data_receive(transport);
979}
980
981
982
983
984
985
986
987
988static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
989 struct sock *sk,
990 struct sk_buff *skb)
991{
992 struct rpc_task *task;
993 struct rpc_rqst *rovr;
994 int repsize, copied;
995 u32 _xid;
996 __be32 *xp;
997
998 repsize = skb->len - sizeof(struct udphdr);
999 if (repsize < 4) {
1000 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1001 return;
1002 }
1003
1004
1005 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1006 sizeof(_xid), &_xid);
1007 if (xp == NULL)
1008 return;
1009
1010
1011 spin_lock_bh(&xprt->transport_lock);
1012 rovr = xprt_lookup_rqst(xprt, *xp);
1013 if (!rovr)
1014 goto out_unlock;
1015 task = rovr->rq_task;
1016
1017 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1018 copied = repsize;
1019
1020
1021 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1022 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1023 goto out_unlock;
1024 }
1025
1026 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1027
1028 xprt_adjust_cwnd(xprt, task, copied);
1029 xprt_complete_rqst(task, copied);
1030
1031 out_unlock:
1032 spin_unlock_bh(&xprt->transport_lock);
1033}
1034
1035static void xs_udp_data_receive(struct sock_xprt *transport)
1036{
1037 struct sk_buff *skb;
1038 struct sock *sk;
1039 int err;
1040
1041 mutex_lock(&transport->recv_mutex);
1042 sk = transport->inet;
1043 if (sk == NULL)
1044 goto out;
1045 for (;;) {
1046 skb = skb_recv_datagram(sk, 0, 1, &err);
1047 if (skb == NULL)
1048 break;
1049 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1050 skb_free_datagram(sk, skb);
1051 }
1052out:
1053 mutex_unlock(&transport->recv_mutex);
1054}
1055
1056static void xs_udp_data_receive_workfn(struct work_struct *work)
1057{
1058 struct sock_xprt *transport =
1059 container_of(work, struct sock_xprt, recv_worker);
1060 xs_udp_data_receive(transport);
1061}
1062
1063
1064
1065
1066
1067
1068static void xs_data_ready(struct sock *sk)
1069{
1070 struct rpc_xprt *xprt;
1071
1072 read_lock_bh(&sk->sk_callback_lock);
1073 dprintk("RPC: xs_data_ready...\n");
1074 xprt = xprt_from_sock(sk);
1075 if (xprt != NULL) {
1076 struct sock_xprt *transport = container_of(xprt,
1077 struct sock_xprt, xprt);
1078 queue_work(rpciod_workqueue, &transport->recv_worker);
1079 }
1080 read_unlock_bh(&sk->sk_callback_lock);
1081}
1082
1083
1084
1085
1086
1087static void xs_tcp_force_close(struct rpc_xprt *xprt)
1088{
1089 xprt_force_disconnect(xprt);
1090}
1091
1092static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1093{
1094 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1095 size_t len, used;
1096 char *p;
1097
1098 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1099 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1100 used = xdr_skb_read_bits(desc, p, len);
1101 transport->tcp_offset += used;
1102 if (used != len)
1103 return;
1104
1105 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1106 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1107 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1108 else
1109 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1110 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1111
1112 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1113 transport->tcp_offset = 0;
1114
1115
1116 if (unlikely(transport->tcp_reclen < 8)) {
1117 dprintk("RPC: invalid TCP record fragment length\n");
1118 xs_tcp_force_close(xprt);
1119 return;
1120 }
1121 dprintk("RPC: reading TCP record fragment of length %d\n",
1122 transport->tcp_reclen);
1123}
1124
1125static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1126{
1127 if (transport->tcp_offset == transport->tcp_reclen) {
1128 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1129 transport->tcp_offset = 0;
1130 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1131 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1132 transport->tcp_flags |= TCP_RCV_COPY_XID;
1133 transport->tcp_copied = 0;
1134 }
1135 }
1136}
1137
1138static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1139{
1140 size_t len, used;
1141 char *p;
1142
1143 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1144 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1145 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1146 used = xdr_skb_read_bits(desc, p, len);
1147 transport->tcp_offset += used;
1148 if (used != len)
1149 return;
1150 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1151 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1152 transport->tcp_copied = 4;
1153 dprintk("RPC: reading %s XID %08x\n",
1154 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1155 : "request with",
1156 ntohl(transport->tcp_xid));
1157 xs_tcp_check_fraghdr(transport);
1158}
1159
1160static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1161 struct xdr_skb_reader *desc)
1162{
1163 size_t len, used;
1164 u32 offset;
1165 char *p;
1166
1167
1168
1169
1170
1171
1172
1173 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1174 len = sizeof(transport->tcp_calldir) - offset;
1175 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1176 p = ((char *) &transport->tcp_calldir) + offset;
1177 used = xdr_skb_read_bits(desc, p, len);
1178 transport->tcp_offset += used;
1179 if (used != len)
1180 return;
1181 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1182
1183
1184
1185
1186 switch (ntohl(transport->tcp_calldir)) {
1187 case RPC_REPLY:
1188 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1189 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1190 transport->tcp_flags |= TCP_RPC_REPLY;
1191 break;
1192 case RPC_CALL:
1193 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1194 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1195 transport->tcp_flags &= ~TCP_RPC_REPLY;
1196 break;
1197 default:
1198 dprintk("RPC: invalid request message type\n");
1199 xs_tcp_force_close(&transport->xprt);
1200 }
1201 xs_tcp_check_fraghdr(transport);
1202}
1203
1204static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1205 struct xdr_skb_reader *desc,
1206 struct rpc_rqst *req)
1207{
1208 struct sock_xprt *transport =
1209 container_of(xprt, struct sock_xprt, xprt);
1210 struct xdr_buf *rcvbuf;
1211 size_t len;
1212 ssize_t r;
1213
1214 rcvbuf = &req->rq_private_buf;
1215
1216 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1217
1218
1219
1220 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1221 &transport->tcp_calldir,
1222 sizeof(transport->tcp_calldir));
1223 transport->tcp_copied += sizeof(transport->tcp_calldir);
1224 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1225 }
1226
1227 len = desc->count;
1228 if (len > transport->tcp_reclen - transport->tcp_offset) {
1229 struct xdr_skb_reader my_desc;
1230
1231 len = transport->tcp_reclen - transport->tcp_offset;
1232 memcpy(&my_desc, desc, sizeof(my_desc));
1233 my_desc.count = len;
1234 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1235 &my_desc, xdr_skb_read_bits);
1236 desc->count -= r;
1237 desc->offset += r;
1238 } else
1239 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1240 desc, xdr_skb_read_bits);
1241
1242 if (r > 0) {
1243 transport->tcp_copied += r;
1244 transport->tcp_offset += r;
1245 }
1246 if (r != len) {
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1257 dprintk("RPC: XID %08x truncated request\n",
1258 ntohl(transport->tcp_xid));
1259 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1260 "tcp_offset = %u, tcp_reclen = %u\n",
1261 xprt, transport->tcp_copied,
1262 transport->tcp_offset, transport->tcp_reclen);
1263 return;
1264 }
1265
1266 dprintk("RPC: XID %08x read %Zd bytes\n",
1267 ntohl(transport->tcp_xid), r);
1268 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1269 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1270 transport->tcp_offset, transport->tcp_reclen);
1271
1272 if (transport->tcp_copied == req->rq_private_buf.buflen)
1273 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1274 else if (transport->tcp_offset == transport->tcp_reclen) {
1275 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1276 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1277 }
1278}
1279
1280
1281
1282
1283
1284static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1285 struct xdr_skb_reader *desc)
1286{
1287 struct sock_xprt *transport =
1288 container_of(xprt, struct sock_xprt, xprt);
1289 struct rpc_rqst *req;
1290
1291 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1292
1293
1294 spin_lock_bh(&xprt->transport_lock);
1295 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1296 if (!req) {
1297 dprintk("RPC: XID %08x request not found!\n",
1298 ntohl(transport->tcp_xid));
1299 spin_unlock_bh(&xprt->transport_lock);
1300 return -1;
1301 }
1302
1303 xs_tcp_read_common(xprt, desc, req);
1304
1305 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1306 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1307
1308 spin_unlock_bh(&xprt->transport_lock);
1309 return 0;
1310}
1311
1312#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1313
1314
1315
1316
1317
1318
1319
1320static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1321 struct xdr_skb_reader *desc)
1322{
1323 struct sock_xprt *transport =
1324 container_of(xprt, struct sock_xprt, xprt);
1325 struct rpc_rqst *req;
1326
1327
1328 spin_lock_bh(&xprt->transport_lock);
1329 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1330 if (req == NULL) {
1331 spin_unlock_bh(&xprt->transport_lock);
1332 printk(KERN_WARNING "Callback slot table overflowed\n");
1333 xprt_force_disconnect(xprt);
1334 return -1;
1335 }
1336
1337 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1338 xs_tcp_read_common(xprt, desc, req);
1339
1340 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1341 xprt_complete_bc_request(req, transport->tcp_copied);
1342 spin_unlock_bh(&xprt->transport_lock);
1343
1344 return 0;
1345}
1346
1347static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1348 struct xdr_skb_reader *desc)
1349{
1350 struct sock_xprt *transport =
1351 container_of(xprt, struct sock_xprt, xprt);
1352
1353 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1354 xs_tcp_read_reply(xprt, desc) :
1355 xs_tcp_read_callback(xprt, desc);
1356}
1357
1358static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1359{
1360 int ret;
1361
1362 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1363 SVC_SOCK_ANONYMOUS);
1364 if (ret < 0)
1365 return ret;
1366 return 0;
1367}
1368#else
1369static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1370 struct xdr_skb_reader *desc)
1371{
1372 return xs_tcp_read_reply(xprt, desc);
1373}
1374#endif
1375
1376
1377
1378
1379
1380static void xs_tcp_read_data(struct rpc_xprt *xprt,
1381 struct xdr_skb_reader *desc)
1382{
1383 struct sock_xprt *transport =
1384 container_of(xprt, struct sock_xprt, xprt);
1385
1386 if (_xs_tcp_read_data(xprt, desc) == 0)
1387 xs_tcp_check_fraghdr(transport);
1388 else {
1389
1390
1391
1392
1393 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1394 }
1395}
1396
1397static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1398{
1399 size_t len;
1400
1401 len = transport->tcp_reclen - transport->tcp_offset;
1402 if (len > desc->count)
1403 len = desc->count;
1404 desc->count -= len;
1405 desc->offset += len;
1406 transport->tcp_offset += len;
1407 dprintk("RPC: discarded %Zu bytes\n", len);
1408 xs_tcp_check_fraghdr(transport);
1409}
1410
1411static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1412{
1413 struct rpc_xprt *xprt = rd_desc->arg.data;
1414 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1415 struct xdr_skb_reader desc = {
1416 .skb = skb,
1417 .offset = offset,
1418 .count = len,
1419 };
1420
1421 dprintk("RPC: xs_tcp_data_recv started\n");
1422 do {
1423 trace_xs_tcp_data_recv(transport);
1424
1425
1426 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1427 xs_tcp_read_fraghdr(xprt, &desc);
1428 continue;
1429 }
1430
1431 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1432 xs_tcp_read_xid(transport, &desc);
1433 continue;
1434 }
1435
1436 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1437 xs_tcp_read_calldir(transport, &desc);
1438 continue;
1439 }
1440
1441 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1442 xs_tcp_read_data(xprt, &desc);
1443 continue;
1444 }
1445
1446 xs_tcp_read_discard(transport, &desc);
1447 } while (desc.count);
1448 trace_xs_tcp_data_recv(transport);
1449 dprintk("RPC: xs_tcp_data_recv done\n");
1450 return len - desc.count;
1451}
1452
1453static void xs_tcp_data_receive(struct sock_xprt *transport)
1454{
1455 struct rpc_xprt *xprt = &transport->xprt;
1456 struct sock *sk;
1457 read_descriptor_t rd_desc = {
1458 .count = 2*1024*1024,
1459 .arg.data = xprt,
1460 };
1461 unsigned long total = 0;
1462 int read = 0;
1463
1464 mutex_lock(&transport->recv_mutex);
1465 sk = transport->inet;
1466 if (sk == NULL)
1467 goto out;
1468
1469
1470 for (;;) {
1471 lock_sock(sk);
1472 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1473 release_sock(sk);
1474 if (read <= 0)
1475 break;
1476 total += read;
1477 rd_desc.count = 65536;
1478 }
1479out:
1480 mutex_unlock(&transport->recv_mutex);
1481 trace_xs_tcp_data_ready(xprt, read, total);
1482}
1483
1484static void xs_tcp_data_receive_workfn(struct work_struct *work)
1485{
1486 struct sock_xprt *transport =
1487 container_of(work, struct sock_xprt, recv_worker);
1488 xs_tcp_data_receive(transport);
1489}
1490
1491
1492
1493
1494
1495
1496static void xs_tcp_data_ready(struct sock *sk)
1497{
1498 struct sock_xprt *transport;
1499 struct rpc_xprt *xprt;
1500
1501 dprintk("RPC: xs_tcp_data_ready...\n");
1502
1503 read_lock_bh(&sk->sk_callback_lock);
1504 if (!(xprt = xprt_from_sock(sk)))
1505 goto out;
1506 transport = container_of(xprt, struct sock_xprt, xprt);
1507
1508
1509
1510
1511 if (xprt->reestablish_timeout)
1512 xprt->reestablish_timeout = 0;
1513 queue_work(rpciod_workqueue, &transport->recv_worker);
1514
1515out:
1516 read_unlock_bh(&sk->sk_callback_lock);
1517}
1518
1519
1520
1521
1522
1523
1524static void xs_tcp_state_change(struct sock *sk)
1525{
1526 struct rpc_xprt *xprt;
1527 struct sock_xprt *transport;
1528
1529 read_lock_bh(&sk->sk_callback_lock);
1530 if (!(xprt = xprt_from_sock(sk)))
1531 goto out;
1532 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1533 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1534 sk->sk_state, xprt_connected(xprt),
1535 sock_flag(sk, SOCK_DEAD),
1536 sock_flag(sk, SOCK_ZAPPED),
1537 sk->sk_shutdown);
1538
1539 transport = container_of(xprt, struct sock_xprt, xprt);
1540 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1541 switch (sk->sk_state) {
1542 case TCP_ESTABLISHED:
1543 spin_lock(&xprt->transport_lock);
1544 if (!xprt_test_and_set_connected(xprt)) {
1545
1546
1547 transport->tcp_offset = 0;
1548 transport->tcp_reclen = 0;
1549 transport->tcp_copied = 0;
1550 transport->tcp_flags =
1551 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1552 xprt->connect_cookie++;
1553 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1554 xprt_clear_connecting(xprt);
1555
1556 xprt_wake_pending_tasks(xprt, -EAGAIN);
1557 }
1558 spin_unlock(&xprt->transport_lock);
1559 break;
1560 case TCP_FIN_WAIT1:
1561
1562 xprt->connect_cookie++;
1563 xprt->reestablish_timeout = 0;
1564 set_bit(XPRT_CLOSING, &xprt->state);
1565 smp_mb__before_atomic();
1566 clear_bit(XPRT_CONNECTED, &xprt->state);
1567 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1568 smp_mb__after_atomic();
1569 break;
1570 case TCP_CLOSE_WAIT:
1571
1572 xprt->connect_cookie++;
1573 clear_bit(XPRT_CONNECTED, &xprt->state);
1574 xs_tcp_force_close(xprt);
1575 case TCP_CLOSING:
1576
1577
1578
1579
1580 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1581 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1582 break;
1583 case TCP_LAST_ACK:
1584 set_bit(XPRT_CLOSING, &xprt->state);
1585 smp_mb__before_atomic();
1586 clear_bit(XPRT_CONNECTED, &xprt->state);
1587 smp_mb__after_atomic();
1588 break;
1589 case TCP_CLOSE:
1590 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1591 &transport->sock_state))
1592 xprt_clear_connecting(xprt);
1593 xs_sock_mark_closed(xprt);
1594 }
1595 out:
1596 read_unlock_bh(&sk->sk_callback_lock);
1597}
1598
1599static void xs_write_space(struct sock *sk)
1600{
1601 struct socket_wq *wq;
1602 struct rpc_xprt *xprt;
1603
1604 if (!sk->sk_socket)
1605 return;
1606 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1607
1608 if (unlikely(!(xprt = xprt_from_sock(sk))))
1609 return;
1610 rcu_read_lock();
1611 wq = rcu_dereference(sk->sk_wq);
1612 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1613 goto out;
1614
1615 xprt_write_space(xprt);
1616out:
1617 rcu_read_unlock();
1618}
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630static void xs_udp_write_space(struct sock *sk)
1631{
1632 read_lock_bh(&sk->sk_callback_lock);
1633
1634
1635 if (sock_writeable(sk))
1636 xs_write_space(sk);
1637
1638 read_unlock_bh(&sk->sk_callback_lock);
1639}
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651static void xs_tcp_write_space(struct sock *sk)
1652{
1653 read_lock_bh(&sk->sk_callback_lock);
1654
1655
1656 if (sk_stream_is_writeable(sk))
1657 xs_write_space(sk);
1658
1659 read_unlock_bh(&sk->sk_callback_lock);
1660}
1661
1662static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1663{
1664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1665 struct sock *sk = transport->inet;
1666
1667 if (transport->rcvsize) {
1668 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1669 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1670 }
1671 if (transport->sndsize) {
1672 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1673 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1674 sk->sk_write_space(sk);
1675 }
1676}
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1687{
1688 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1689
1690 transport->sndsize = 0;
1691 if (sndsize)
1692 transport->sndsize = sndsize + 1024;
1693 transport->rcvsize = 0;
1694 if (rcvsize)
1695 transport->rcvsize = rcvsize + 1024;
1696
1697 xs_udp_do_set_buffer_size(xprt);
1698}
1699
1700
1701
1702
1703
1704
1705
1706static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1707{
1708 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1709}
1710
1711static unsigned short xs_get_random_port(void)
1712{
1713 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1714 unsigned short rand = (unsigned short) prandom_u32() % range;
1715 return rand + xprt_min_resvport;
1716}
1717
1718
1719
1720
1721
1722
1723
1724
1725static void xs_sock_set_reuseport(struct socket *sock)
1726{
1727 int opt = 1;
1728
1729 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1730 (char *)&opt, sizeof(opt));
1731}
1732
1733static unsigned short xs_sock_getport(struct socket *sock)
1734{
1735 struct sockaddr_storage buf;
1736 int buflen;
1737 unsigned short port = 0;
1738
1739 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1740 goto out;
1741 switch (buf.ss_family) {
1742 case AF_INET6:
1743 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1744 break;
1745 case AF_INET:
1746 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1747 }
1748out:
1749 return port;
1750}
1751
1752
1753
1754
1755
1756
1757
1758static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1759{
1760 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1761
1762 rpc_set_port(xs_addr(xprt), port);
1763 xs_update_peer_port(xprt);
1764}
1765
1766static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1767{
1768 if (transport->srcport == 0)
1769 transport->srcport = xs_sock_getport(sock);
1770}
1771
1772static unsigned short xs_get_srcport(struct sock_xprt *transport)
1773{
1774 unsigned short port = transport->srcport;
1775
1776 if (port == 0 && transport->xprt.resvport)
1777 port = xs_get_random_port();
1778 return port;
1779}
1780
1781static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1782{
1783 if (transport->srcport != 0)
1784 transport->srcport = 0;
1785 if (!transport->xprt.resvport)
1786 return 0;
1787 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1788 return xprt_max_resvport;
1789 return --port;
1790}
1791static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1792{
1793 struct sockaddr_storage myaddr;
1794 int err, nloop = 0;
1795 unsigned short port = xs_get_srcport(transport);
1796 unsigned short last;
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813 if (port == 0)
1814 return 0;
1815
1816 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1817 do {
1818 rpc_set_port((struct sockaddr *)&myaddr, port);
1819 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1820 transport->xprt.addrlen);
1821 if (err == 0) {
1822 transport->srcport = port;
1823 break;
1824 }
1825 last = port;
1826 port = xs_next_srcport(transport, port);
1827 if (port > last)
1828 nloop++;
1829 } while (err == -EADDRINUSE && nloop != 2);
1830
1831 if (myaddr.ss_family == AF_INET)
1832 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1833 &((struct sockaddr_in *)&myaddr)->sin_addr,
1834 port, err ? "failed" : "ok", err);
1835 else
1836 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1837 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1838 port, err ? "failed" : "ok", err);
1839 return err;
1840}
1841
1842
1843
1844
1845static void xs_local_rpcbind(struct rpc_task *task)
1846{
1847 xprt_set_bound(task->tk_xprt);
1848}
1849
1850static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1851{
1852}
1853
1854#ifdef CONFIG_DEBUG_LOCK_ALLOC
1855static struct lock_class_key xs_key[2];
1856static struct lock_class_key xs_slock_key[2];
1857
1858static inline void xs_reclassify_socketu(struct socket *sock)
1859{
1860 struct sock *sk = sock->sk;
1861
1862 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1863 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1864}
1865
1866static inline void xs_reclassify_socket4(struct socket *sock)
1867{
1868 struct sock *sk = sock->sk;
1869
1870 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1871 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1872}
1873
1874static inline void xs_reclassify_socket6(struct socket *sock)
1875{
1876 struct sock *sk = sock->sk;
1877
1878 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1879 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1880}
1881
1882static inline void xs_reclassify_socket(int family, struct socket *sock)
1883{
1884 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1885 if (sock_owned_by_user(sock->sk))
1886 return;
1887
1888 switch (family) {
1889 case AF_LOCAL:
1890 xs_reclassify_socketu(sock);
1891 break;
1892 case AF_INET:
1893 xs_reclassify_socket4(sock);
1894 break;
1895 case AF_INET6:
1896 xs_reclassify_socket6(sock);
1897 break;
1898 }
1899}
1900#else
1901static inline void xs_reclassify_socket(int family, struct socket *sock)
1902{
1903}
1904#endif
1905
1906static void xs_dummy_setup_socket(struct work_struct *work)
1907{
1908}
1909
1910static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1911 struct sock_xprt *transport, int family, int type,
1912 int protocol, bool reuseport)
1913{
1914 struct socket *sock;
1915 int err;
1916
1917 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1918 if (err < 0) {
1919 dprintk("RPC: can't create %d transport socket (%d).\n",
1920 protocol, -err);
1921 goto out;
1922 }
1923 xs_reclassify_socket(family, sock);
1924
1925 if (reuseport)
1926 xs_sock_set_reuseport(sock);
1927
1928 err = xs_bind(transport, sock);
1929 if (err) {
1930 sock_release(sock);
1931 goto out;
1932 }
1933
1934 return sock;
1935out:
1936 return ERR_PTR(err);
1937}
1938
1939static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1940 struct socket *sock)
1941{
1942 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1943 xprt);
1944
1945 if (!transport->inet) {
1946 struct sock *sk = sock->sk;
1947
1948 write_lock_bh(&sk->sk_callback_lock);
1949
1950 xs_save_old_callbacks(transport, sk);
1951
1952 sk->sk_user_data = xprt;
1953 sk->sk_data_ready = xs_data_ready;
1954 sk->sk_write_space = xs_udp_write_space;
1955 sk->sk_error_report = xs_error_report;
1956 sk->sk_allocation = GFP_NOIO;
1957
1958 xprt_clear_connected(xprt);
1959
1960
1961 transport->sock = sock;
1962 transport->inet = sk;
1963
1964 write_unlock_bh(&sk->sk_callback_lock);
1965 }
1966
1967
1968 xprt->stat.connect_count++;
1969 xprt->stat.connect_start = jiffies;
1970 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1971}
1972
1973
1974
1975
1976
1977static int xs_local_setup_socket(struct sock_xprt *transport)
1978{
1979 struct rpc_xprt *xprt = &transport->xprt;
1980 struct socket *sock;
1981 int status = -EIO;
1982
1983 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1984 SOCK_STREAM, 0, &sock, 1);
1985 if (status < 0) {
1986 dprintk("RPC: can't create AF_LOCAL "
1987 "transport socket (%d).\n", -status);
1988 goto out;
1989 }
1990 xs_reclassify_socket(AF_LOCAL, sock);
1991
1992 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1993 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1994
1995 status = xs_local_finish_connecting(xprt, sock);
1996 trace_rpc_socket_connect(xprt, sock, status);
1997 switch (status) {
1998 case 0:
1999 dprintk("RPC: xprt %p connected to %s\n",
2000 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2001 xprt_set_connected(xprt);
2002 case -ENOBUFS:
2003 break;
2004 case -ENOENT:
2005 dprintk("RPC: xprt %p: socket %s does not exist\n",
2006 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2007 break;
2008 case -ECONNREFUSED:
2009 dprintk("RPC: xprt %p: connection refused for %s\n",
2010 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2011 break;
2012 default:
2013 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2014 __func__, -status,
2015 xprt->address_strings[RPC_DISPLAY_ADDR]);
2016 }
2017
2018out:
2019 xprt_clear_connecting(xprt);
2020 xprt_wake_pending_tasks(xprt, status);
2021 return status;
2022}
2023
2024static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2025{
2026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2027 int ret;
2028
2029 if (RPC_IS_ASYNC(task)) {
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039 rpc_exit(task, -ENOTCONN);
2040 return;
2041 }
2042 ret = xs_local_setup_socket(transport);
2043 if (ret && !RPC_IS_SOFTCONN(task))
2044 msleep_interruptible(15000);
2045}
2046
2047#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2048
2049
2050
2051
2052
2053static void xs_set_memalloc(struct rpc_xprt *xprt)
2054{
2055 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2056 xprt);
2057
2058
2059
2060
2061
2062 if (!transport->inet)
2063 return;
2064 if (atomic_read(&xprt->swapper))
2065 sk_set_memalloc(transport->inet);
2066}
2067
2068
2069
2070
2071
2072
2073
2074
2075static int
2076xs_enable_swap(struct rpc_xprt *xprt)
2077{
2078 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2079
2080 if (atomic_inc_return(&xprt->swapper) != 1)
2081 return 0;
2082 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2083 return -ERESTARTSYS;
2084 if (xs->inet)
2085 sk_set_memalloc(xs->inet);
2086 xprt_release_xprt(xprt, NULL);
2087 return 0;
2088}
2089
2090
2091
2092
2093
2094
2095
2096
2097static void
2098xs_disable_swap(struct rpc_xprt *xprt)
2099{
2100 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2101
2102 if (!atomic_dec_and_test(&xprt->swapper))
2103 return;
2104 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2105 return;
2106 if (xs->inet)
2107 sk_clear_memalloc(xs->inet);
2108 xprt_release_xprt(xprt, NULL);
2109}
2110#else
2111static void xs_set_memalloc(struct rpc_xprt *xprt)
2112{
2113}
2114
2115static int
2116xs_enable_swap(struct rpc_xprt *xprt)
2117{
2118 return -EINVAL;
2119}
2120
2121static void
2122xs_disable_swap(struct rpc_xprt *xprt)
2123{
2124}
2125#endif
2126
2127static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2128{
2129 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2130
2131 if (!transport->inet) {
2132 struct sock *sk = sock->sk;
2133
2134 write_lock_bh(&sk->sk_callback_lock);
2135
2136 xs_save_old_callbacks(transport, sk);
2137
2138 sk->sk_user_data = xprt;
2139 sk->sk_data_ready = xs_data_ready;
2140 sk->sk_write_space = xs_udp_write_space;
2141 sk->sk_allocation = GFP_NOIO;
2142
2143 xprt_set_connected(xprt);
2144
2145
2146 transport->sock = sock;
2147 transport->inet = sk;
2148
2149 xs_set_memalloc(xprt);
2150
2151 write_unlock_bh(&sk->sk_callback_lock);
2152 }
2153 xs_udp_do_set_buffer_size(xprt);
2154}
2155
2156static void xs_udp_setup_socket(struct work_struct *work)
2157{
2158 struct sock_xprt *transport =
2159 container_of(work, struct sock_xprt, connect_worker.work);
2160 struct rpc_xprt *xprt = &transport->xprt;
2161 struct socket *sock = transport->sock;
2162 int status = -EIO;
2163
2164 sock = xs_create_sock(xprt, transport,
2165 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2166 IPPROTO_UDP, false);
2167 if (IS_ERR(sock))
2168 goto out;
2169
2170 dprintk("RPC: worker connecting xprt %p via %s to "
2171 "%s (port %s)\n", xprt,
2172 xprt->address_strings[RPC_DISPLAY_PROTO],
2173 xprt->address_strings[RPC_DISPLAY_ADDR],
2174 xprt->address_strings[RPC_DISPLAY_PORT]);
2175
2176 xs_udp_finish_connecting(xprt, sock);
2177 trace_rpc_socket_connect(xprt, sock, 0);
2178 status = 0;
2179out:
2180 xprt_unlock_connect(xprt, transport);
2181 xprt_clear_connecting(xprt);
2182 xprt_wake_pending_tasks(xprt, status);
2183}
2184
2185
2186
2187
2188
2189
2190
2191
2192static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2193{
2194 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2195 struct socket *sock = transport->sock;
2196
2197 if (sock == NULL)
2198 return;
2199 if (xprt_connected(xprt)) {
2200 kernel_sock_shutdown(sock, SHUT_RDWR);
2201 trace_rpc_socket_shutdown(xprt, sock);
2202 } else
2203 xs_reset_transport(transport);
2204}
2205
2206static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2207{
2208 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2209 int ret = -ENOTCONN;
2210
2211 if (!transport->inet) {
2212 struct sock *sk = sock->sk;
2213 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2214 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2215 unsigned int opt_on = 1;
2216 unsigned int timeo;
2217
2218
2219 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2220 (char *)&opt_on, sizeof(opt_on));
2221 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2222 (char *)&keepidle, sizeof(keepidle));
2223 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2224 (char *)&keepidle, sizeof(keepidle));
2225 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2226 (char *)&keepcnt, sizeof(keepcnt));
2227
2228
2229 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2230 (xprt->timeout->to_retries + 1);
2231 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2232 (char *)&timeo, sizeof(timeo));
2233
2234 write_lock_bh(&sk->sk_callback_lock);
2235
2236 xs_save_old_callbacks(transport, sk);
2237
2238 sk->sk_user_data = xprt;
2239 sk->sk_data_ready = xs_tcp_data_ready;
2240 sk->sk_state_change = xs_tcp_state_change;
2241 sk->sk_write_space = xs_tcp_write_space;
2242 sk->sk_error_report = xs_error_report;
2243 sk->sk_allocation = GFP_NOIO;
2244
2245
2246 sock_reset_flag(sk, SOCK_LINGER);
2247 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2248
2249 xprt_clear_connected(xprt);
2250
2251
2252 transport->sock = sock;
2253 transport->inet = sk;
2254
2255 write_unlock_bh(&sk->sk_callback_lock);
2256 }
2257
2258 if (!xprt_bound(xprt))
2259 goto out;
2260
2261 xs_set_memalloc(xprt);
2262
2263
2264 xprt->stat.connect_count++;
2265 xprt->stat.connect_start = jiffies;
2266 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2267 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2268 switch (ret) {
2269 case 0:
2270 xs_set_srcport(transport, sock);
2271 case -EINPROGRESS:
2272
2273 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2274 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2275 }
2276out:
2277 return ret;
2278}
2279
2280
2281
2282
2283
2284
2285static void xs_tcp_setup_socket(struct work_struct *work)
2286{
2287 struct sock_xprt *transport =
2288 container_of(work, struct sock_xprt, connect_worker.work);
2289 struct socket *sock = transport->sock;
2290 struct rpc_xprt *xprt = &transport->xprt;
2291 int status = -EIO;
2292
2293 if (!sock) {
2294 sock = xs_create_sock(xprt, transport,
2295 xs_addr(xprt)->sa_family, SOCK_STREAM,
2296 IPPROTO_TCP, true);
2297 if (IS_ERR(sock)) {
2298 status = PTR_ERR(sock);
2299 goto out;
2300 }
2301 }
2302
2303 dprintk("RPC: worker connecting xprt %p via %s to "
2304 "%s (port %s)\n", xprt,
2305 xprt->address_strings[RPC_DISPLAY_PROTO],
2306 xprt->address_strings[RPC_DISPLAY_ADDR],
2307 xprt->address_strings[RPC_DISPLAY_PORT]);
2308
2309 status = xs_tcp_finish_connecting(xprt, sock);
2310 trace_rpc_socket_connect(xprt, sock, status);
2311 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2312 xprt, -status, xprt_connected(xprt),
2313 sock->sk->sk_state);
2314 switch (status) {
2315 default:
2316 printk("%s: connect returned unhandled error %d\n",
2317 __func__, status);
2318 case -EADDRNOTAVAIL:
2319
2320
2321
2322 xs_tcp_force_close(xprt);
2323 break;
2324 case 0:
2325 case -EINPROGRESS:
2326 case -EALREADY:
2327 xprt_unlock_connect(xprt, transport);
2328 return;
2329 case -EINVAL:
2330
2331
2332
2333 case -ECONNREFUSED:
2334 case -ECONNRESET:
2335 case -ENETUNREACH:
2336 case -EADDRINUSE:
2337 case -ENOBUFS:
2338
2339 xs_tcp_force_close(xprt);
2340 goto out;
2341 }
2342 status = -EAGAIN;
2343out:
2344 xprt_unlock_connect(xprt, transport);
2345 xprt_clear_connecting(xprt);
2346 xprt_wake_pending_tasks(xprt, status);
2347}
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2364{
2365 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2366
2367 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2368
2369 if (transport->sock != NULL) {
2370 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2371 "seconds\n",
2372 xprt, xprt->reestablish_timeout / HZ);
2373
2374
2375 xs_reset_transport(transport);
2376
2377 queue_delayed_work(rpciod_workqueue,
2378 &transport->connect_worker,
2379 xprt->reestablish_timeout);
2380 xprt->reestablish_timeout <<= 1;
2381 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2382 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2383 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2384 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2385 } else {
2386 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2387 queue_delayed_work(rpciod_workqueue,
2388 &transport->connect_worker, 0);
2389 }
2390}
2391
2392
2393
2394
2395
2396
2397
2398static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2399{
2400 long idle_time = 0;
2401
2402 if (xprt_connected(xprt))
2403 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2404
2405 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2406 "%llu %llu %lu %llu %llu\n",
2407 xprt->stat.bind_count,
2408 xprt->stat.connect_count,
2409 xprt->stat.connect_time,
2410 idle_time,
2411 xprt->stat.sends,
2412 xprt->stat.recvs,
2413 xprt->stat.bad_xids,
2414 xprt->stat.req_u,
2415 xprt->stat.bklog_u,
2416 xprt->stat.max_slots,
2417 xprt->stat.sending_u,
2418 xprt->stat.pending_u);
2419}
2420
2421
2422
2423
2424
2425
2426
2427static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2428{
2429 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2430
2431 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2432 "%lu %llu %llu\n",
2433 transport->srcport,
2434 xprt->stat.bind_count,
2435 xprt->stat.sends,
2436 xprt->stat.recvs,
2437 xprt->stat.bad_xids,
2438 xprt->stat.req_u,
2439 xprt->stat.bklog_u,
2440 xprt->stat.max_slots,
2441 xprt->stat.sending_u,
2442 xprt->stat.pending_u);
2443}
2444
2445
2446
2447
2448
2449
2450
2451static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2452{
2453 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2454 long idle_time = 0;
2455
2456 if (xprt_connected(xprt))
2457 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2458
2459 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2460 "%llu %llu %lu %llu %llu\n",
2461 transport->srcport,
2462 xprt->stat.bind_count,
2463 xprt->stat.connect_count,
2464 xprt->stat.connect_time,
2465 idle_time,
2466 xprt->stat.sends,
2467 xprt->stat.recvs,
2468 xprt->stat.bad_xids,
2469 xprt->stat.req_u,
2470 xprt->stat.bklog_u,
2471 xprt->stat.max_slots,
2472 xprt->stat.sending_u,
2473 xprt->stat.pending_u);
2474}
2475
2476
2477
2478
2479
2480
2481static void *bc_malloc(struct rpc_task *task, size_t size)
2482{
2483 struct page *page;
2484 struct rpc_buffer *buf;
2485
2486 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2487 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2488 return NULL;
2489
2490 page = alloc_page(GFP_KERNEL);
2491 if (!page)
2492 return NULL;
2493
2494 buf = page_address(page);
2495 buf->len = PAGE_SIZE;
2496
2497 return buf->data;
2498}
2499
2500
2501
2502
2503static void bc_free(void *buffer)
2504{
2505 struct rpc_buffer *buf;
2506
2507 if (!buffer)
2508 return;
2509
2510 buf = container_of(buffer, struct rpc_buffer, data);
2511 free_page((unsigned long)buf);
2512}
2513
2514
2515
2516
2517
2518static int bc_sendto(struct rpc_rqst *req)
2519{
2520 int len;
2521 struct xdr_buf *xbufp = &req->rq_snd_buf;
2522 struct rpc_xprt *xprt = req->rq_xprt;
2523 struct sock_xprt *transport =
2524 container_of(xprt, struct sock_xprt, xprt);
2525 struct socket *sock = transport->sock;
2526 unsigned long headoff;
2527 unsigned long tailoff;
2528
2529 xs_encode_stream_record_marker(xbufp);
2530
2531 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2532 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2533 len = svc_send_common(sock, xbufp,
2534 virt_to_page(xbufp->head[0].iov_base), headoff,
2535 xbufp->tail[0].iov_base, tailoff);
2536
2537 if (len != xbufp->len) {
2538 printk(KERN_NOTICE "Error sending entire callback!\n");
2539 len = -EAGAIN;
2540 }
2541
2542 return len;
2543}
2544
2545
2546
2547
2548static int bc_send_request(struct rpc_task *task)
2549{
2550 struct rpc_rqst *req = task->tk_rqstp;
2551 struct svc_xprt *xprt;
2552 int len;
2553
2554 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2555
2556
2557
2558 xprt = req->rq_xprt->bc_xprt;
2559
2560
2561
2562
2563
2564 if (!mutex_trylock(&xprt->xpt_mutex)) {
2565 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2566 if (!mutex_trylock(&xprt->xpt_mutex))
2567 return -EAGAIN;
2568 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2569 }
2570 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2571 len = -ENOTCONN;
2572 else
2573 len = bc_sendto(req);
2574 mutex_unlock(&xprt->xpt_mutex);
2575
2576 if (len > 0)
2577 len = 0;
2578
2579 return len;
2580}
2581
2582
2583
2584
2585
2586static void bc_close(struct rpc_xprt *xprt)
2587{
2588}
2589
2590
2591
2592
2593
2594
2595static void bc_destroy(struct rpc_xprt *xprt)
2596{
2597 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2598
2599 xs_xprt_free(xprt);
2600 module_put(THIS_MODULE);
2601}
2602
2603static struct rpc_xprt_ops xs_local_ops = {
2604 .reserve_xprt = xprt_reserve_xprt,
2605 .release_xprt = xs_tcp_release_xprt,
2606 .alloc_slot = xprt_alloc_slot,
2607 .rpcbind = xs_local_rpcbind,
2608 .set_port = xs_local_set_port,
2609 .connect = xs_local_connect,
2610 .buf_alloc = rpc_malloc,
2611 .buf_free = rpc_free,
2612 .send_request = xs_local_send_request,
2613 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2614 .close = xs_close,
2615 .destroy = xs_destroy,
2616 .print_stats = xs_local_print_stats,
2617 .enable_swap = xs_enable_swap,
2618 .disable_swap = xs_disable_swap,
2619};
2620
2621static struct rpc_xprt_ops xs_udp_ops = {
2622 .set_buffer_size = xs_udp_set_buffer_size,
2623 .reserve_xprt = xprt_reserve_xprt_cong,
2624 .release_xprt = xprt_release_xprt_cong,
2625 .alloc_slot = xprt_alloc_slot,
2626 .rpcbind = rpcb_getport_async,
2627 .set_port = xs_set_port,
2628 .connect = xs_connect,
2629 .buf_alloc = rpc_malloc,
2630 .buf_free = rpc_free,
2631 .send_request = xs_udp_send_request,
2632 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2633 .timer = xs_udp_timer,
2634 .release_request = xprt_release_rqst_cong,
2635 .close = xs_close,
2636 .destroy = xs_destroy,
2637 .print_stats = xs_udp_print_stats,
2638 .enable_swap = xs_enable_swap,
2639 .disable_swap = xs_disable_swap,
2640 .inject_disconnect = xs_inject_disconnect,
2641};
2642
2643static struct rpc_xprt_ops xs_tcp_ops = {
2644 .reserve_xprt = xprt_reserve_xprt,
2645 .release_xprt = xs_tcp_release_xprt,
2646 .alloc_slot = xprt_lock_and_alloc_slot,
2647 .rpcbind = rpcb_getport_async,
2648 .set_port = xs_set_port,
2649 .connect = xs_connect,
2650 .buf_alloc = rpc_malloc,
2651 .buf_free = rpc_free,
2652 .send_request = xs_tcp_send_request,
2653 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2654 .close = xs_tcp_shutdown,
2655 .destroy = xs_destroy,
2656 .print_stats = xs_tcp_print_stats,
2657 .enable_swap = xs_enable_swap,
2658 .disable_swap = xs_disable_swap,
2659 .inject_disconnect = xs_inject_disconnect,
2660#ifdef CONFIG_SUNRPC_BACKCHANNEL
2661 .bc_setup = xprt_setup_bc,
2662 .bc_up = xs_tcp_bc_up,
2663 .bc_free_rqst = xprt_free_bc_rqst,
2664 .bc_destroy = xprt_destroy_bc,
2665#endif
2666};
2667
2668
2669
2670
2671
2672static struct rpc_xprt_ops bc_tcp_ops = {
2673 .reserve_xprt = xprt_reserve_xprt,
2674 .release_xprt = xprt_release_xprt,
2675 .alloc_slot = xprt_alloc_slot,
2676 .buf_alloc = bc_malloc,
2677 .buf_free = bc_free,
2678 .send_request = bc_send_request,
2679 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2680 .close = bc_close,
2681 .destroy = bc_destroy,
2682 .print_stats = xs_tcp_print_stats,
2683 .enable_swap = xs_enable_swap,
2684 .disable_swap = xs_disable_swap,
2685 .inject_disconnect = xs_inject_disconnect,
2686};
2687
2688static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2689{
2690 static const struct sockaddr_in sin = {
2691 .sin_family = AF_INET,
2692 .sin_addr.s_addr = htonl(INADDR_ANY),
2693 };
2694 static const struct sockaddr_in6 sin6 = {
2695 .sin6_family = AF_INET6,
2696 .sin6_addr = IN6ADDR_ANY_INIT,
2697 };
2698
2699 switch (family) {
2700 case AF_LOCAL:
2701 break;
2702 case AF_INET:
2703 memcpy(sap, &sin, sizeof(sin));
2704 break;
2705 case AF_INET6:
2706 memcpy(sap, &sin6, sizeof(sin6));
2707 break;
2708 default:
2709 dprintk("RPC: %s: Bad address family\n", __func__);
2710 return -EAFNOSUPPORT;
2711 }
2712 return 0;
2713}
2714
2715static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2716 unsigned int slot_table_size,
2717 unsigned int max_slot_table_size)
2718{
2719 struct rpc_xprt *xprt;
2720 struct sock_xprt *new;
2721
2722 if (args->addrlen > sizeof(xprt->addr)) {
2723 dprintk("RPC: xs_setup_xprt: address too large\n");
2724 return ERR_PTR(-EBADF);
2725 }
2726
2727 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2728 max_slot_table_size);
2729 if (xprt == NULL) {
2730 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2731 "rpc_xprt\n");
2732 return ERR_PTR(-ENOMEM);
2733 }
2734
2735 new = container_of(xprt, struct sock_xprt, xprt);
2736 mutex_init(&new->recv_mutex);
2737 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2738 xprt->addrlen = args->addrlen;
2739 if (args->srcaddr)
2740 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2741 else {
2742 int err;
2743 err = xs_init_anyaddr(args->dstaddr->sa_family,
2744 (struct sockaddr *)&new->srcaddr);
2745 if (err != 0) {
2746 xprt_free(xprt);
2747 return ERR_PTR(err);
2748 }
2749 }
2750
2751 return xprt;
2752}
2753
2754static const struct rpc_timeout xs_local_default_timeout = {
2755 .to_initval = 10 * HZ,
2756 .to_maxval = 10 * HZ,
2757 .to_retries = 2,
2758};
2759
2760
2761
2762
2763
2764
2765
2766static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2767{
2768 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2769 struct sock_xprt *transport;
2770 struct rpc_xprt *xprt;
2771 struct rpc_xprt *ret;
2772
2773 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2774 xprt_max_tcp_slot_table_entries);
2775 if (IS_ERR(xprt))
2776 return xprt;
2777 transport = container_of(xprt, struct sock_xprt, xprt);
2778
2779 xprt->prot = 0;
2780 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2781 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2782
2783 xprt->bind_timeout = XS_BIND_TO;
2784 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2785 xprt->idle_timeout = XS_IDLE_DISC_TO;
2786
2787 xprt->ops = &xs_local_ops;
2788 xprt->timeout = &xs_local_default_timeout;
2789
2790 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2791 INIT_DELAYED_WORK(&transport->connect_worker,
2792 xs_dummy_setup_socket);
2793
2794 switch (sun->sun_family) {
2795 case AF_LOCAL:
2796 if (sun->sun_path[0] != '/') {
2797 dprintk("RPC: bad AF_LOCAL address: %s\n",
2798 sun->sun_path);
2799 ret = ERR_PTR(-EINVAL);
2800 goto out_err;
2801 }
2802 xprt_set_bound(xprt);
2803 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2804 ret = ERR_PTR(xs_local_setup_socket(transport));
2805 if (ret)
2806 goto out_err;
2807 break;
2808 default:
2809 ret = ERR_PTR(-EAFNOSUPPORT);
2810 goto out_err;
2811 }
2812
2813 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2814 xprt->address_strings[RPC_DISPLAY_ADDR]);
2815
2816 if (try_module_get(THIS_MODULE))
2817 return xprt;
2818 ret = ERR_PTR(-EINVAL);
2819out_err:
2820 xs_xprt_free(xprt);
2821 return ret;
2822}
2823
2824static const struct rpc_timeout xs_udp_default_timeout = {
2825 .to_initval = 5 * HZ,
2826 .to_maxval = 30 * HZ,
2827 .to_increment = 5 * HZ,
2828 .to_retries = 5,
2829};
2830
2831
2832
2833
2834
2835
2836static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2837{
2838 struct sockaddr *addr = args->dstaddr;
2839 struct rpc_xprt *xprt;
2840 struct sock_xprt *transport;
2841 struct rpc_xprt *ret;
2842
2843 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2844 xprt_udp_slot_table_entries);
2845 if (IS_ERR(xprt))
2846 return xprt;
2847 transport = container_of(xprt, struct sock_xprt, xprt);
2848
2849 xprt->prot = IPPROTO_UDP;
2850 xprt->tsh_size = 0;
2851
2852 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2853
2854 xprt->bind_timeout = XS_BIND_TO;
2855 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2856 xprt->idle_timeout = XS_IDLE_DISC_TO;
2857
2858 xprt->ops = &xs_udp_ops;
2859
2860 xprt->timeout = &xs_udp_default_timeout;
2861
2862 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2863 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2864
2865 switch (addr->sa_family) {
2866 case AF_INET:
2867 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2868 xprt_set_bound(xprt);
2869
2870 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2871 break;
2872 case AF_INET6:
2873 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2874 xprt_set_bound(xprt);
2875
2876 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2877 break;
2878 default:
2879 ret = ERR_PTR(-EAFNOSUPPORT);
2880 goto out_err;
2881 }
2882
2883 if (xprt_bound(xprt))
2884 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2885 xprt->address_strings[RPC_DISPLAY_ADDR],
2886 xprt->address_strings[RPC_DISPLAY_PORT],
2887 xprt->address_strings[RPC_DISPLAY_PROTO]);
2888 else
2889 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2890 xprt->address_strings[RPC_DISPLAY_ADDR],
2891 xprt->address_strings[RPC_DISPLAY_PROTO]);
2892
2893 if (try_module_get(THIS_MODULE))
2894 return xprt;
2895 ret = ERR_PTR(-EINVAL);
2896out_err:
2897 xs_xprt_free(xprt);
2898 return ret;
2899}
2900
2901static const struct rpc_timeout xs_tcp_default_timeout = {
2902 .to_initval = 60 * HZ,
2903 .to_maxval = 60 * HZ,
2904 .to_retries = 2,
2905};
2906
2907
2908
2909
2910
2911
2912static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2913{
2914 struct sockaddr *addr = args->dstaddr;
2915 struct rpc_xprt *xprt;
2916 struct sock_xprt *transport;
2917 struct rpc_xprt *ret;
2918 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2919
2920 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2921 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2922
2923 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2924 max_slot_table_size);
2925 if (IS_ERR(xprt))
2926 return xprt;
2927 transport = container_of(xprt, struct sock_xprt, xprt);
2928
2929 xprt->prot = IPPROTO_TCP;
2930 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2931 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2932
2933 xprt->bind_timeout = XS_BIND_TO;
2934 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2935 xprt->idle_timeout = XS_IDLE_DISC_TO;
2936
2937 xprt->ops = &xs_tcp_ops;
2938 xprt->timeout = &xs_tcp_default_timeout;
2939
2940 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
2941 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2942
2943 switch (addr->sa_family) {
2944 case AF_INET:
2945 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2946 xprt_set_bound(xprt);
2947
2948 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2949 break;
2950 case AF_INET6:
2951 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2952 xprt_set_bound(xprt);
2953
2954 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2955 break;
2956 default:
2957 ret = ERR_PTR(-EAFNOSUPPORT);
2958 goto out_err;
2959 }
2960
2961 if (xprt_bound(xprt))
2962 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2963 xprt->address_strings[RPC_DISPLAY_ADDR],
2964 xprt->address_strings[RPC_DISPLAY_PORT],
2965 xprt->address_strings[RPC_DISPLAY_PROTO]);
2966 else
2967 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2968 xprt->address_strings[RPC_DISPLAY_ADDR],
2969 xprt->address_strings[RPC_DISPLAY_PROTO]);
2970
2971 if (try_module_get(THIS_MODULE))
2972 return xprt;
2973 ret = ERR_PTR(-EINVAL);
2974out_err:
2975 xs_xprt_free(xprt);
2976 return ret;
2977}
2978
2979
2980
2981
2982
2983
2984static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2985{
2986 struct sockaddr *addr = args->dstaddr;
2987 struct rpc_xprt *xprt;
2988 struct sock_xprt *transport;
2989 struct svc_sock *bc_sock;
2990 struct rpc_xprt *ret;
2991
2992 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2993 xprt_tcp_slot_table_entries);
2994 if (IS_ERR(xprt))
2995 return xprt;
2996 transport = container_of(xprt, struct sock_xprt, xprt);
2997
2998 xprt->prot = IPPROTO_TCP;
2999 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3000 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3001 xprt->timeout = &xs_tcp_default_timeout;
3002
3003
3004 xprt_set_bound(xprt);
3005 xprt->bind_timeout = 0;
3006 xprt->reestablish_timeout = 0;
3007 xprt->idle_timeout = 0;
3008
3009 xprt->ops = &bc_tcp_ops;
3010
3011 switch (addr->sa_family) {
3012 case AF_INET:
3013 xs_format_peer_addresses(xprt, "tcp",
3014 RPCBIND_NETID_TCP);
3015 break;
3016 case AF_INET6:
3017 xs_format_peer_addresses(xprt, "tcp",
3018 RPCBIND_NETID_TCP6);
3019 break;
3020 default:
3021 ret = ERR_PTR(-EAFNOSUPPORT);
3022 goto out_err;
3023 }
3024
3025 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3026 xprt->address_strings[RPC_DISPLAY_ADDR],
3027 xprt->address_strings[RPC_DISPLAY_PORT],
3028 xprt->address_strings[RPC_DISPLAY_PROTO]);
3029
3030
3031
3032
3033
3034
3035
3036 xprt_get(xprt);
3037 args->bc_xprt->xpt_bc_xprt = xprt;
3038 xprt->bc_xprt = args->bc_xprt;
3039 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3040 transport->sock = bc_sock->sk_sock;
3041 transport->inet = bc_sock->sk_sk;
3042
3043
3044
3045
3046
3047 xprt_set_connected(xprt);
3048
3049 if (try_module_get(THIS_MODULE))
3050 return xprt;
3051
3052 args->bc_xprt->xpt_bc_xprt = NULL;
3053 xprt_put(xprt);
3054 ret = ERR_PTR(-EINVAL);
3055out_err:
3056 xs_xprt_free(xprt);
3057 return ret;
3058}
3059
3060static struct xprt_class xs_local_transport = {
3061 .list = LIST_HEAD_INIT(xs_local_transport.list),
3062 .name = "named UNIX socket",
3063 .owner = THIS_MODULE,
3064 .ident = XPRT_TRANSPORT_LOCAL,
3065 .setup = xs_setup_local,
3066};
3067
3068static struct xprt_class xs_udp_transport = {
3069 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3070 .name = "udp",
3071 .owner = THIS_MODULE,
3072 .ident = XPRT_TRANSPORT_UDP,
3073 .setup = xs_setup_udp,
3074};
3075
3076static struct xprt_class xs_tcp_transport = {
3077 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3078 .name = "tcp",
3079 .owner = THIS_MODULE,
3080 .ident = XPRT_TRANSPORT_TCP,
3081 .setup = xs_setup_tcp,
3082};
3083
3084static struct xprt_class xs_bc_tcp_transport = {
3085 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3086 .name = "tcp NFSv4.1 backchannel",
3087 .owner = THIS_MODULE,
3088 .ident = XPRT_TRANSPORT_BC_TCP,
3089 .setup = xs_setup_bc_tcp,
3090};
3091
3092
3093
3094
3095
3096int init_socket_xprt(void)
3097{
3098#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3099 if (!sunrpc_table_header)
3100 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3101#endif
3102
3103 xprt_register_transport(&xs_local_transport);
3104 xprt_register_transport(&xs_udp_transport);
3105 xprt_register_transport(&xs_tcp_transport);
3106 xprt_register_transport(&xs_bc_tcp_transport);
3107
3108 return 0;
3109}
3110
3111
3112
3113
3114
3115void cleanup_socket_xprt(void)
3116{
3117#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3118 if (sunrpc_table_header) {
3119 unregister_sysctl_table(sunrpc_table_header);
3120 sunrpc_table_header = NULL;
3121 }
3122#endif
3123
3124 xprt_unregister_transport(&xs_local_transport);
3125 xprt_unregister_transport(&xs_udp_transport);
3126 xprt_unregister_transport(&xs_tcp_transport);
3127 xprt_unregister_transport(&xs_bc_tcp_transport);
3128}
3129
3130static int param_set_uint_minmax(const char *val,
3131 const struct kernel_param *kp,
3132 unsigned int min, unsigned int max)
3133{
3134 unsigned int num;
3135 int ret;
3136
3137 if (!val)
3138 return -EINVAL;
3139 ret = kstrtouint(val, 0, &num);
3140 if (ret == -EINVAL || num < min || num > max)
3141 return -EINVAL;
3142 *((unsigned int *)kp->arg) = num;
3143 return 0;
3144}
3145
3146static int param_set_portnr(const char *val, const struct kernel_param *kp)
3147{
3148 return param_set_uint_minmax(val, kp,
3149 RPC_MIN_RESVPORT,
3150 RPC_MAX_RESVPORT);
3151}
3152
3153static const struct kernel_param_ops param_ops_portnr = {
3154 .set = param_set_portnr,
3155 .get = param_get_uint,
3156};
3157
3158#define param_check_portnr(name, p) \
3159 __param_check(name, p, unsigned int);
3160
3161module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3162module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3163
3164static int param_set_slot_table_size(const char *val,
3165 const struct kernel_param *kp)
3166{
3167 return param_set_uint_minmax(val, kp,
3168 RPC_MIN_SLOT_TABLE,
3169 RPC_MAX_SLOT_TABLE);
3170}
3171
3172static const struct kernel_param_ops param_ops_slot_table_size = {
3173 .set = param_set_slot_table_size,
3174 .get = param_get_uint,
3175};
3176
3177#define param_check_slot_table_size(name, p) \
3178 __param_check(name, p, unsigned int);
3179
3180static int param_set_max_slot_table_size(const char *val,
3181 const struct kernel_param *kp)
3182{
3183 return param_set_uint_minmax(val, kp,
3184 RPC_MIN_SLOT_TABLE,
3185 RPC_MAX_SLOT_TABLE_LIMIT);
3186}
3187
3188static const struct kernel_param_ops param_ops_max_slot_table_size = {
3189 .set = param_set_max_slot_table_size,
3190 .get = param_get_uint,
3191};
3192
3193#define param_check_max_slot_table_size(name, p) \
3194 __param_check(name, p, unsigned int);
3195
3196module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3197 slot_table_size, 0644);
3198module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3199 max_slot_table_size, 0644);
3200module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3201 slot_table_size, 0644);
3202
3203