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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#include <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "sunrpc.h"
58
59static void xs_close(struct rpc_xprt *xprt);
60static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
61 struct socket *sock);
62
63
64
65
66static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
67static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
68static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
69
70static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
71static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
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_limit
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_limit,
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
163
164
165#define XS_BIND_TO (60U * HZ)
166
167
168
169
170
171#define XS_UDP_REEST_TO (2U * HZ)
172
173
174
175
176
177
178
179
180
181
182#define XS_TCP_INIT_REEST_TO (3U * HZ)
183
184
185
186
187
188
189#define XS_IDLE_DISC_TO (5U * 60 * HZ)
190
191#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
192# undef RPC_DEBUG_DATA
193# define RPCDBG_FACILITY RPCDBG_TRANS
194#endif
195
196#ifdef RPC_DEBUG_DATA
197static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
198{
199 u8 *buf = (u8 *) packet;
200 int j;
201
202 dprintk("RPC: %s\n", msg);
203 for (j = 0; j < count && j < 128; j += 4) {
204 if (!(j & 31)) {
205 if (j)
206 dprintk("\n");
207 dprintk("0x%04x ", j);
208 }
209 dprintk("%02x%02x%02x%02x ",
210 buf[j], buf[j+1], buf[j+2], buf[j+3]);
211 }
212 dprintk("\n");
213}
214#else
215static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
216{
217
218}
219#endif
220
221static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
222{
223 return (struct rpc_xprt *) sk->sk_user_data;
224}
225
226static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
227{
228 return (struct sockaddr *) &xprt->addr;
229}
230
231static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
232{
233 return (struct sockaddr_un *) &xprt->addr;
234}
235
236static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
237{
238 return (struct sockaddr_in *) &xprt->addr;
239}
240
241static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
242{
243 return (struct sockaddr_in6 *) &xprt->addr;
244}
245
246static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
247{
248 struct sockaddr *sap = xs_addr(xprt);
249 struct sockaddr_in6 *sin6;
250 struct sockaddr_in *sin;
251 struct sockaddr_un *sun;
252 char buf[128];
253
254 switch (sap->sa_family) {
255 case AF_LOCAL:
256 sun = xs_addr_un(xprt);
257 strlcpy(buf, sun->sun_path, sizeof(buf));
258 xprt->address_strings[RPC_DISPLAY_ADDR] =
259 kstrdup(buf, GFP_KERNEL);
260 break;
261 case AF_INET:
262 (void)rpc_ntop(sap, buf, sizeof(buf));
263 xprt->address_strings[RPC_DISPLAY_ADDR] =
264 kstrdup(buf, GFP_KERNEL);
265 sin = xs_addr_in(xprt);
266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
267 break;
268 case AF_INET6:
269 (void)rpc_ntop(sap, buf, sizeof(buf));
270 xprt->address_strings[RPC_DISPLAY_ADDR] =
271 kstrdup(buf, GFP_KERNEL);
272 sin6 = xs_addr_in6(xprt);
273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
274 break;
275 default:
276 BUG();
277 }
278
279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
280}
281
282static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
283{
284 struct sockaddr *sap = xs_addr(xprt);
285 char buf[128];
286
287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
289
290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
292}
293
294static void xs_format_peer_addresses(struct rpc_xprt *xprt,
295 const char *protocol,
296 const char *netid)
297{
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
300 xs_format_common_peer_addresses(xprt);
301 xs_format_common_peer_ports(xprt);
302}
303
304static void xs_update_peer_port(struct rpc_xprt *xprt)
305{
306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
308
309 xs_format_common_peer_ports(xprt);
310}
311
312static void xs_free_peer_addresses(struct rpc_xprt *xprt)
313{
314 unsigned int i;
315
316 for (i = 0; i < RPC_DISPLAY_MAX; i++)
317 switch (i) {
318 case RPC_DISPLAY_PROTO:
319 case RPC_DISPLAY_NETID:
320 continue;
321 default:
322 kfree(xprt->address_strings[i]);
323 }
324}
325
326static size_t
327xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
328{
329 size_t i,n;
330
331 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
332 return want;
333 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
334 for (i = 0; i < n; i++) {
335 if (buf->pages[i])
336 continue;
337 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
338 if (!buf->pages[i]) {
339 i *= PAGE_SIZE;
340 return i > buf->page_base ? i - buf->page_base : 0;
341 }
342 }
343 return want;
344}
345
346static ssize_t
347xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
348{
349 ssize_t ret;
350 if (seek != 0)
351 iov_iter_advance(&msg->msg_iter, seek);
352 ret = sock_recvmsg(sock, msg, flags);
353 return ret > 0 ? ret + seek : ret;
354}
355
356static ssize_t
357xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
358 struct kvec *kvec, size_t count, size_t seek)
359{
360 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
361 return xs_sock_recvmsg(sock, msg, flags, seek);
362}
363
364static ssize_t
365xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
366 struct bio_vec *bvec, unsigned long nr, size_t count,
367 size_t seek)
368{
369 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
370 return xs_sock_recvmsg(sock, msg, flags, seek);
371}
372
373static ssize_t
374xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
375 size_t count)
376{
377 iov_iter_discard(&msg->msg_iter, READ, count);
378 return sock_recvmsg(sock, msg, flags);
379}
380
381#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
382static void
383xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
384{
385 struct bvec_iter bi = {
386 .bi_size = count,
387 };
388 struct bio_vec bv;
389
390 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
391 for_each_bvec(bv, bvec, bi, bi)
392 flush_dcache_page(bv.bv_page);
393}
394#else
395static inline void
396xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
397{
398}
399#endif
400
401static ssize_t
402xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
403 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
404{
405 size_t want, seek_init = seek, offset = 0;
406 ssize_t ret;
407
408 want = min_t(size_t, count, buf->head[0].iov_len);
409 if (seek < want) {
410 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
411 if (ret <= 0)
412 goto sock_err;
413 offset += ret;
414 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
415 goto out;
416 if (ret != want)
417 goto out;
418 seek = 0;
419 } else {
420 seek -= want;
421 offset += want;
422 }
423
424 want = xs_alloc_sparse_pages(buf,
425 min_t(size_t, count - offset, buf->page_len),
426 GFP_KERNEL);
427 if (seek < want) {
428 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
429 xdr_buf_pagecount(buf),
430 want + buf->page_base,
431 seek + buf->page_base);
432 if (ret <= 0)
433 goto sock_err;
434 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
435 offset += ret - buf->page_base;
436 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
437 goto out;
438 if (ret != want)
439 goto out;
440 seek = 0;
441 } else {
442 seek -= want;
443 offset += want;
444 }
445
446 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
447 if (seek < want) {
448 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
449 if (ret <= 0)
450 goto sock_err;
451 offset += ret;
452 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
453 goto out;
454 if (ret != want)
455 goto out;
456 } else if (offset < seek_init)
457 offset = seek_init;
458 ret = -EMSGSIZE;
459out:
460 *read = offset - seek_init;
461 return ret;
462sock_err:
463 offset += seek;
464 goto out;
465}
466
467static void
468xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
469{
470 if (!transport->recv.copied) {
471 if (buf->head[0].iov_len >= transport->recv.offset)
472 memcpy(buf->head[0].iov_base,
473 &transport->recv.xid,
474 transport->recv.offset);
475 transport->recv.copied = transport->recv.offset;
476 }
477}
478
479static bool
480xs_read_stream_request_done(struct sock_xprt *transport)
481{
482 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
483}
484
485static void
486xs_read_stream_check_eor(struct sock_xprt *transport,
487 struct msghdr *msg)
488{
489 if (xs_read_stream_request_done(transport))
490 msg->msg_flags |= MSG_EOR;
491}
492
493static ssize_t
494xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
495 int flags, struct rpc_rqst *req)
496{
497 struct xdr_buf *buf = &req->rq_private_buf;
498 size_t want, uninitialized_var(read);
499 ssize_t uninitialized_var(ret);
500
501 xs_read_header(transport, buf);
502
503 want = transport->recv.len - transport->recv.offset;
504 if (want != 0) {
505 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
506 transport->recv.copied + want,
507 transport->recv.copied,
508 &read);
509 transport->recv.offset += read;
510 transport->recv.copied += read;
511 }
512
513 if (transport->recv.offset == transport->recv.len)
514 xs_read_stream_check_eor(transport, msg);
515
516 if (want == 0)
517 return 0;
518
519 switch (ret) {
520 default:
521 break;
522 case -EFAULT:
523 case -EMSGSIZE:
524 msg->msg_flags |= MSG_TRUNC;
525 return read;
526 case 0:
527 return -ESHUTDOWN;
528 }
529 return ret < 0 ? ret : read;
530}
531
532static size_t
533xs_read_stream_headersize(bool isfrag)
534{
535 if (isfrag)
536 return sizeof(__be32);
537 return 3 * sizeof(__be32);
538}
539
540static ssize_t
541xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
542 int flags, size_t want, size_t seek)
543{
544 struct kvec kvec = {
545 .iov_base = &transport->recv.fraghdr,
546 .iov_len = want,
547 };
548 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
549}
550
551#if defined(CONFIG_SUNRPC_BACKCHANNEL)
552static ssize_t
553xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
554{
555 struct rpc_xprt *xprt = &transport->xprt;
556 struct rpc_rqst *req;
557 ssize_t ret;
558
559
560 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
561 if (!req) {
562 printk(KERN_WARNING "Callback slot table overflowed\n");
563 return -ESHUTDOWN;
564 }
565
566 ret = xs_read_stream_request(transport, msg, flags, req);
567 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
568 xprt_complete_bc_request(req, transport->recv.copied);
569
570 return ret;
571}
572#else
573static ssize_t
574xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
575{
576 return -ESHUTDOWN;
577}
578#endif
579
580static ssize_t
581xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
582{
583 struct rpc_xprt *xprt = &transport->xprt;
584 struct rpc_rqst *req;
585 ssize_t ret = 0;
586
587
588 spin_lock(&xprt->queue_lock);
589 req = xprt_lookup_rqst(xprt, transport->recv.xid);
590 if (!req) {
591 msg->msg_flags |= MSG_TRUNC;
592 goto out;
593 }
594 xprt_pin_rqst(req);
595 spin_unlock(&xprt->queue_lock);
596
597 ret = xs_read_stream_request(transport, msg, flags, req);
598
599 spin_lock(&xprt->queue_lock);
600 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
601 xprt_complete_rqst(req->rq_task, transport->recv.copied);
602 xprt_unpin_rqst(req);
603out:
604 spin_unlock(&xprt->queue_lock);
605 return ret;
606}
607
608static ssize_t
609xs_read_stream(struct sock_xprt *transport, int flags)
610{
611 struct msghdr msg = { 0 };
612 size_t want, read = 0;
613 ssize_t ret = 0;
614
615 if (transport->recv.len == 0) {
616 want = xs_read_stream_headersize(transport->recv.copied != 0);
617 ret = xs_read_stream_header(transport, &msg, flags, want,
618 transport->recv.offset);
619 if (ret <= 0)
620 goto out_err;
621 transport->recv.offset = ret;
622 if (transport->recv.offset != want)
623 return transport->recv.offset;
624 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
625 RPC_FRAGMENT_SIZE_MASK;
626 transport->recv.offset -= sizeof(transport->recv.fraghdr);
627 read = ret;
628 }
629
630 switch (be32_to_cpu(transport->recv.calldir)) {
631 default:
632 msg.msg_flags |= MSG_TRUNC;
633 break;
634 case RPC_CALL:
635 ret = xs_read_stream_call(transport, &msg, flags);
636 break;
637 case RPC_REPLY:
638 ret = xs_read_stream_reply(transport, &msg, flags);
639 }
640 if (msg.msg_flags & MSG_TRUNC) {
641 transport->recv.calldir = cpu_to_be32(-1);
642 transport->recv.copied = -1;
643 }
644 if (ret < 0)
645 goto out_err;
646 read += ret;
647 if (transport->recv.offset < transport->recv.len) {
648 if (!(msg.msg_flags & MSG_TRUNC))
649 return read;
650 msg.msg_flags = 0;
651 ret = xs_read_discard(transport->sock, &msg, flags,
652 transport->recv.len - transport->recv.offset);
653 if (ret <= 0)
654 goto out_err;
655 transport->recv.offset += ret;
656 read += ret;
657 if (transport->recv.offset != transport->recv.len)
658 return read;
659 }
660 if (xs_read_stream_request_done(transport)) {
661 trace_xs_stream_read_request(transport);
662 transport->recv.copied = 0;
663 }
664 transport->recv.offset = 0;
665 transport->recv.len = 0;
666 return read;
667out_err:
668 return ret != 0 ? ret : -ESHUTDOWN;
669}
670
671static __poll_t xs_poll_socket(struct sock_xprt *transport)
672{
673 return transport->sock->ops->poll(transport->file, transport->sock,
674 NULL);
675}
676
677static bool xs_poll_socket_readable(struct sock_xprt *transport)
678{
679 __poll_t events = xs_poll_socket(transport);
680
681 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
682}
683
684static void xs_poll_check_readable(struct sock_xprt *transport)
685{
686
687 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
688 if (!xs_poll_socket_readable(transport))
689 return;
690 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
691 queue_work(xprtiod_workqueue, &transport->recv_worker);
692}
693
694static void xs_stream_data_receive(struct sock_xprt *transport)
695{
696 size_t read = 0;
697 ssize_t ret = 0;
698
699 mutex_lock(&transport->recv_mutex);
700 if (transport->sock == NULL)
701 goto out;
702 for (;;) {
703 ret = xs_read_stream(transport, MSG_DONTWAIT);
704 if (ret < 0)
705 break;
706 read += ret;
707 cond_resched();
708 }
709 if (ret == -ESHUTDOWN)
710 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
711 else
712 xs_poll_check_readable(transport);
713out:
714 mutex_unlock(&transport->recv_mutex);
715 trace_xs_stream_read_data(&transport->xprt, ret, read);
716}
717
718static void xs_stream_data_receive_workfn(struct work_struct *work)
719{
720 struct sock_xprt *transport =
721 container_of(work, struct sock_xprt, recv_worker);
722 unsigned int pflags = memalloc_nofs_save();
723
724 xs_stream_data_receive(transport);
725 memalloc_nofs_restore(pflags);
726}
727
728static void
729xs_stream_reset_connect(struct sock_xprt *transport)
730{
731 transport->recv.offset = 0;
732 transport->recv.len = 0;
733 transport->recv.copied = 0;
734 transport->xmit.offset = 0;
735}
736
737static void
738xs_stream_start_connect(struct sock_xprt *transport)
739{
740 transport->xprt.stat.connect_count++;
741 transport->xprt.stat.connect_start = jiffies;
742}
743
744#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
745
746static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek)
747{
748 if (seek)
749 iov_iter_advance(&msg->msg_iter, seek);
750 return sock_sendmsg(sock, msg);
751}
752
753static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek)
754{
755 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
756 return xs_sendmsg(sock, msg, seek);
757}
758
759static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
760{
761 int err;
762
763 err = xdr_alloc_bvec(xdr, GFP_KERNEL);
764 if (err < 0)
765 return err;
766
767 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
768 xdr_buf_pagecount(xdr),
769 xdr->page_len + xdr->page_base);
770 return xs_sendmsg(sock, msg, base + xdr->page_base);
771}
772
773#define xs_record_marker_len() sizeof(rpc_fraghdr)
774
775
776
777
778
779
780static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
781 rpc_fraghdr marker, struct kvec *vec, size_t base)
782{
783 struct kvec iov[2] = {
784 [0] = {
785 .iov_base = &marker,
786 .iov_len = sizeof(marker)
787 },
788 [1] = *vec,
789 };
790 size_t len = iov[0].iov_len + iov[1].iov_len;
791
792 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
793 return xs_sendmsg(sock, msg, base);
794}
795
796
797
798
799
800
801
802
803
804
805
806
807static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p)
808{
809 struct msghdr msg = {
810 .msg_name = addr,
811 .msg_namelen = addrlen,
812 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE,
813 };
814 unsigned int rmsize = rm ? sizeof(rm) : 0;
815 unsigned int remainder = rmsize + xdr->len - base;
816 unsigned int want;
817 int err = 0;
818
819 if (unlikely(!sock))
820 return -ENOTSOCK;
821
822 want = xdr->head[0].iov_len + rmsize;
823 if (base < want) {
824 unsigned int len = want - base;
825 remainder -= len;
826 if (remainder == 0)
827 msg.msg_flags &= ~MSG_MORE;
828 if (rmsize)
829 err = xs_send_rm_and_kvec(sock, &msg, rm,
830 &xdr->head[0], base);
831 else
832 err = xs_send_kvec(sock, &msg, &xdr->head[0], base);
833 if (remainder == 0 || err != len)
834 goto out;
835 *sent_p += err;
836 base = 0;
837 } else
838 base -= want;
839
840 if (base < xdr->page_len) {
841 unsigned int len = xdr->page_len - base;
842 remainder -= len;
843 if (remainder == 0)
844 msg.msg_flags &= ~MSG_MORE;
845 err = xs_send_pagedata(sock, &msg, xdr, base);
846 if (remainder == 0 || err != len)
847 goto out;
848 *sent_p += err;
849 base = 0;
850 } else
851 base -= xdr->page_len;
852
853 if (base >= xdr->tail[0].iov_len)
854 return 0;
855 msg.msg_flags &= ~MSG_MORE;
856 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base);
857out:
858 if (err > 0) {
859 *sent_p += err;
860 err = 0;
861 }
862 return err;
863}
864
865
866
867
868
869
870static int xs_nospace(struct rpc_rqst *req)
871{
872 struct rpc_xprt *xprt = req->rq_xprt;
873 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
874 struct sock *sk = transport->inet;
875 int ret = -EAGAIN;
876
877 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
878 req->rq_task->tk_pid,
879 req->rq_slen - transport->xmit.offset,
880 req->rq_slen);
881
882
883 spin_lock_bh(&xprt->transport_lock);
884
885
886 if (xprt_connected(xprt)) {
887
888 sk->sk_write_pending++;
889 xprt_wait_for_buffer_space(xprt);
890 } else
891 ret = -ENOTCONN;
892
893 spin_unlock_bh(&xprt->transport_lock);
894
895
896 if (ret == -EAGAIN) {
897 struct socket_wq *wq;
898
899 rcu_read_lock();
900 wq = rcu_dereference(sk->sk_wq);
901 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
902 rcu_read_unlock();
903
904 sk->sk_write_space(sk);
905 }
906 return ret;
907}
908
909static void
910xs_stream_prepare_request(struct rpc_rqst *req)
911{
912 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
913}
914
915
916
917
918
919static bool
920xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
921{
922 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
923}
924
925
926
927
928static rpc_fraghdr
929xs_stream_record_marker(struct xdr_buf *xdr)
930{
931 if (!xdr->len)
932 return 0;
933 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
934}
935
936
937
938
939
940
941
942
943
944
945
946
947static int xs_local_send_request(struct rpc_rqst *req)
948{
949 struct rpc_xprt *xprt = req->rq_xprt;
950 struct sock_xprt *transport =
951 container_of(xprt, struct sock_xprt, xprt);
952 struct xdr_buf *xdr = &req->rq_snd_buf;
953 rpc_fraghdr rm = xs_stream_record_marker(xdr);
954 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
955 int status;
956 int sent = 0;
957
958
959 if (xs_send_request_was_aborted(transport, req)) {
960 xs_close(xprt);
961 return -ENOTCONN;
962 }
963
964 xs_pktdump("packet data:",
965 req->rq_svec->iov_base, req->rq_svec->iov_len);
966
967 req->rq_xtime = ktime_get();
968 status = xs_sendpages(transport->sock, NULL, 0, xdr,
969 transport->xmit.offset, rm, &sent);
970 dprintk("RPC: %s(%u) = %d\n",
971 __func__, xdr->len - transport->xmit.offset, status);
972
973 if (status == -EAGAIN && sock_writeable(transport->inet))
974 status = -ENOBUFS;
975
976 if (likely(sent > 0) || status == 0) {
977 transport->xmit.offset += sent;
978 req->rq_bytes_sent = transport->xmit.offset;
979 if (likely(req->rq_bytes_sent >= msglen)) {
980 req->rq_xmit_bytes_sent += transport->xmit.offset;
981 transport->xmit.offset = 0;
982 return 0;
983 }
984 status = -EAGAIN;
985 }
986
987 switch (status) {
988 case -ENOBUFS:
989 break;
990 case -EAGAIN:
991 status = xs_nospace(req);
992 break;
993 default:
994 dprintk("RPC: sendmsg returned unrecognized error %d\n",
995 -status);
996
997 case -EPIPE:
998 xs_close(xprt);
999 status = -ENOTCONN;
1000 }
1001
1002 return status;
1003}
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016static int xs_udp_send_request(struct rpc_rqst *req)
1017{
1018 struct rpc_xprt *xprt = req->rq_xprt;
1019 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1020 struct xdr_buf *xdr = &req->rq_snd_buf;
1021 int sent = 0;
1022 int status;
1023
1024 xs_pktdump("packet data:",
1025 req->rq_svec->iov_base,
1026 req->rq_svec->iov_len);
1027
1028 if (!xprt_bound(xprt))
1029 return -ENOTCONN;
1030
1031 if (!xprt_request_get_cong(xprt, req))
1032 return -EBADSLT;
1033
1034 req->rq_xtime = ktime_get();
1035 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
1036 xdr, 0, 0, &sent);
1037
1038 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1039 xdr->len, status);
1040
1041
1042 if (status == -EPERM)
1043 goto process_status;
1044
1045 if (status == -EAGAIN && sock_writeable(transport->inet))
1046 status = -ENOBUFS;
1047
1048 if (sent > 0 || status == 0) {
1049 req->rq_xmit_bytes_sent += sent;
1050 if (sent >= req->rq_slen)
1051 return 0;
1052
1053 status = -EAGAIN;
1054 }
1055
1056process_status:
1057 switch (status) {
1058 case -ENOTSOCK:
1059 status = -ENOTCONN;
1060
1061 break;
1062 case -EAGAIN:
1063 status = xs_nospace(req);
1064 break;
1065 case -ENETUNREACH:
1066 case -ENOBUFS:
1067 case -EPIPE:
1068 case -ECONNREFUSED:
1069 case -EPERM:
1070
1071
1072 break;
1073 default:
1074 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1075 -status);
1076 }
1077
1078 return status;
1079}
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095static int xs_tcp_send_request(struct rpc_rqst *req)
1096{
1097 struct rpc_xprt *xprt = req->rq_xprt;
1098 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1099 struct xdr_buf *xdr = &req->rq_snd_buf;
1100 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1101 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1102 bool vm_wait = false;
1103 int status;
1104 int sent;
1105
1106
1107 if (xs_send_request_was_aborted(transport, req)) {
1108 if (transport->sock != NULL)
1109 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1110 return -ENOTCONN;
1111 }
1112
1113 xs_pktdump("packet data:",
1114 req->rq_svec->iov_base,
1115 req->rq_svec->iov_len);
1116
1117 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1118 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1119
1120
1121
1122
1123 req->rq_xtime = ktime_get();
1124 while (1) {
1125 sent = 0;
1126 status = xs_sendpages(transport->sock, NULL, 0, xdr,
1127 transport->xmit.offset, rm, &sent);
1128
1129 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1130 xdr->len - transport->xmit.offset, status);
1131
1132
1133
1134 transport->xmit.offset += sent;
1135 req->rq_bytes_sent = transport->xmit.offset;
1136 if (likely(req->rq_bytes_sent >= msglen)) {
1137 req->rq_xmit_bytes_sent += transport->xmit.offset;
1138 transport->xmit.offset = 0;
1139 return 0;
1140 }
1141
1142 WARN_ON_ONCE(sent == 0 && status == 0);
1143
1144 if (status == -EAGAIN ) {
1145
1146
1147
1148
1149 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1150 break;
1151
1152
1153
1154 if (sent == 0) {
1155 status = -ENOBUFS;
1156 if (vm_wait)
1157 break;
1158
1159
1160
1161 vm_wait = true;
1162 }
1163 continue;
1164 }
1165 if (status < 0)
1166 break;
1167 vm_wait = false;
1168 }
1169
1170 switch (status) {
1171 case -ENOTSOCK:
1172 status = -ENOTCONN;
1173
1174 break;
1175 case -EAGAIN:
1176 status = xs_nospace(req);
1177 break;
1178 case -ECONNRESET:
1179 case -ECONNREFUSED:
1180 case -ENOTCONN:
1181 case -EADDRINUSE:
1182 case -ENOBUFS:
1183 case -EPIPE:
1184 break;
1185 default:
1186 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1187 -status);
1188 }
1189
1190 return status;
1191}
1192
1193static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1194{
1195 transport->old_data_ready = sk->sk_data_ready;
1196 transport->old_state_change = sk->sk_state_change;
1197 transport->old_write_space = sk->sk_write_space;
1198 transport->old_error_report = sk->sk_error_report;
1199}
1200
1201static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1202{
1203 sk->sk_data_ready = transport->old_data_ready;
1204 sk->sk_state_change = transport->old_state_change;
1205 sk->sk_write_space = transport->old_write_space;
1206 sk->sk_error_report = transport->old_error_report;
1207}
1208
1209static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1210{
1211 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1212
1213 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1214}
1215
1216static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1217{
1218 smp_mb__before_atomic();
1219 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1220 clear_bit(XPRT_CLOSING, &xprt->state);
1221 xs_sock_reset_state_flags(xprt);
1222 smp_mb__after_atomic();
1223}
1224
1225
1226
1227
1228
1229
1230
1231
1232static void xs_error_report(struct sock *sk)
1233{
1234 struct rpc_xprt *xprt;
1235 int err;
1236
1237 read_lock_bh(&sk->sk_callback_lock);
1238 if (!(xprt = xprt_from_sock(sk)))
1239 goto out;
1240
1241 err = -sk->sk_err;
1242 if (err == 0)
1243 goto out;
1244 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1245 xprt, -err);
1246 trace_rpc_socket_error(xprt, sk->sk_socket, err);
1247 xprt_wake_pending_tasks(xprt, err);
1248 out:
1249 read_unlock_bh(&sk->sk_callback_lock);
1250}
1251
1252static void xs_reset_transport(struct sock_xprt *transport)
1253{
1254 struct socket *sock = transport->sock;
1255 struct sock *sk = transport->inet;
1256 struct rpc_xprt *xprt = &transport->xprt;
1257 struct file *filp = transport->file;
1258
1259 if (sk == NULL)
1260 return;
1261
1262 if (atomic_read(&transport->xprt.swapper))
1263 sk_clear_memalloc(sk);
1264
1265 kernel_sock_shutdown(sock, SHUT_RDWR);
1266
1267 mutex_lock(&transport->recv_mutex);
1268 write_lock_bh(&sk->sk_callback_lock);
1269 transport->inet = NULL;
1270 transport->sock = NULL;
1271 transport->file = NULL;
1272
1273 sk->sk_user_data = NULL;
1274
1275 xs_restore_old_callbacks(transport, sk);
1276 xprt_clear_connected(xprt);
1277 write_unlock_bh(&sk->sk_callback_lock);
1278 xs_sock_reset_connection_flags(xprt);
1279
1280 xs_stream_reset_connect(transport);
1281 mutex_unlock(&transport->recv_mutex);
1282
1283 trace_rpc_socket_close(xprt, sock);
1284 fput(filp);
1285
1286 xprt_disconnect_done(xprt);
1287}
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299static void xs_close(struct rpc_xprt *xprt)
1300{
1301 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1302
1303 dprintk("RPC: xs_close xprt %p\n", xprt);
1304
1305 xs_reset_transport(transport);
1306 xprt->reestablish_timeout = 0;
1307}
1308
1309static void xs_inject_disconnect(struct rpc_xprt *xprt)
1310{
1311 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1312 xprt);
1313 xprt_disconnect_done(xprt);
1314}
1315
1316static void xs_xprt_free(struct rpc_xprt *xprt)
1317{
1318 xs_free_peer_addresses(xprt);
1319 xprt_free(xprt);
1320}
1321
1322
1323
1324
1325
1326
1327static void xs_destroy(struct rpc_xprt *xprt)
1328{
1329 struct sock_xprt *transport = container_of(xprt,
1330 struct sock_xprt, xprt);
1331 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1332
1333 cancel_delayed_work_sync(&transport->connect_worker);
1334 xs_close(xprt);
1335 cancel_work_sync(&transport->recv_worker);
1336 xs_xprt_free(xprt);
1337 module_put(THIS_MODULE);
1338}
1339
1340
1341
1342
1343
1344
1345
1346
1347static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1348 struct sock *sk,
1349 struct sk_buff *skb)
1350{
1351 struct rpc_task *task;
1352 struct rpc_rqst *rovr;
1353 int repsize, copied;
1354 u32 _xid;
1355 __be32 *xp;
1356
1357 repsize = skb->len;
1358 if (repsize < 4) {
1359 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1360 return;
1361 }
1362
1363
1364 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1365 if (xp == NULL)
1366 return;
1367
1368
1369 spin_lock(&xprt->queue_lock);
1370 rovr = xprt_lookup_rqst(xprt, *xp);
1371 if (!rovr)
1372 goto out_unlock;
1373 xprt_pin_rqst(rovr);
1374 xprt_update_rtt(rovr->rq_task);
1375 spin_unlock(&xprt->queue_lock);
1376 task = rovr->rq_task;
1377
1378 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1379 copied = repsize;
1380
1381
1382 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1383 spin_lock(&xprt->queue_lock);
1384 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1385 goto out_unpin;
1386 }
1387
1388
1389 spin_lock_bh(&xprt->transport_lock);
1390 xprt_adjust_cwnd(xprt, task, copied);
1391 spin_unlock_bh(&xprt->transport_lock);
1392 spin_lock(&xprt->queue_lock);
1393 xprt_complete_rqst(task, copied);
1394 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1395out_unpin:
1396 xprt_unpin_rqst(rovr);
1397 out_unlock:
1398 spin_unlock(&xprt->queue_lock);
1399}
1400
1401static void xs_udp_data_receive(struct sock_xprt *transport)
1402{
1403 struct sk_buff *skb;
1404 struct sock *sk;
1405 int err;
1406
1407 mutex_lock(&transport->recv_mutex);
1408 sk = transport->inet;
1409 if (sk == NULL)
1410 goto out;
1411 for (;;) {
1412 skb = skb_recv_udp(sk, 0, 1, &err);
1413 if (skb == NULL)
1414 break;
1415 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1416 consume_skb(skb);
1417 cond_resched();
1418 }
1419 xs_poll_check_readable(transport);
1420out:
1421 mutex_unlock(&transport->recv_mutex);
1422}
1423
1424static void xs_udp_data_receive_workfn(struct work_struct *work)
1425{
1426 struct sock_xprt *transport =
1427 container_of(work, struct sock_xprt, recv_worker);
1428 unsigned int pflags = memalloc_nofs_save();
1429
1430 xs_udp_data_receive(transport);
1431 memalloc_nofs_restore(pflags);
1432}
1433
1434
1435
1436
1437
1438
1439static void xs_data_ready(struct sock *sk)
1440{
1441 struct rpc_xprt *xprt;
1442
1443 read_lock_bh(&sk->sk_callback_lock);
1444 dprintk("RPC: xs_data_ready...\n");
1445 xprt = xprt_from_sock(sk);
1446 if (xprt != NULL) {
1447 struct sock_xprt *transport = container_of(xprt,
1448 struct sock_xprt, xprt);
1449 transport->old_data_ready(sk);
1450
1451
1452
1453 if (xprt->reestablish_timeout)
1454 xprt->reestablish_timeout = 0;
1455 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1456 queue_work(xprtiod_workqueue, &transport->recv_worker);
1457 }
1458 read_unlock_bh(&sk->sk_callback_lock);
1459}
1460
1461
1462
1463
1464
1465static void xs_tcp_force_close(struct rpc_xprt *xprt)
1466{
1467 xprt_force_disconnect(xprt);
1468}
1469
1470#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1471static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1472{
1473 return PAGE_SIZE;
1474}
1475#endif
1476
1477
1478
1479
1480
1481
1482static void xs_tcp_state_change(struct sock *sk)
1483{
1484 struct rpc_xprt *xprt;
1485 struct sock_xprt *transport;
1486
1487 read_lock_bh(&sk->sk_callback_lock);
1488 if (!(xprt = xprt_from_sock(sk)))
1489 goto out;
1490 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1491 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1492 sk->sk_state, xprt_connected(xprt),
1493 sock_flag(sk, SOCK_DEAD),
1494 sock_flag(sk, SOCK_ZAPPED),
1495 sk->sk_shutdown);
1496
1497 transport = container_of(xprt, struct sock_xprt, xprt);
1498 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1499 switch (sk->sk_state) {
1500 case TCP_ESTABLISHED:
1501 spin_lock(&xprt->transport_lock);
1502 if (!xprt_test_and_set_connected(xprt)) {
1503 xprt->connect_cookie++;
1504 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1505 xprt_clear_connecting(xprt);
1506
1507 xprt->stat.connect_count++;
1508 xprt->stat.connect_time += (long)jiffies -
1509 xprt->stat.connect_start;
1510 xprt_wake_pending_tasks(xprt, -EAGAIN);
1511 }
1512 spin_unlock(&xprt->transport_lock);
1513 break;
1514 case TCP_FIN_WAIT1:
1515
1516 xprt->connect_cookie++;
1517 xprt->reestablish_timeout = 0;
1518 set_bit(XPRT_CLOSING, &xprt->state);
1519 smp_mb__before_atomic();
1520 clear_bit(XPRT_CONNECTED, &xprt->state);
1521 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1522 smp_mb__after_atomic();
1523 break;
1524 case TCP_CLOSE_WAIT:
1525
1526 xprt->connect_cookie++;
1527 clear_bit(XPRT_CONNECTED, &xprt->state);
1528 xs_tcp_force_close(xprt);
1529
1530 case TCP_CLOSING:
1531
1532
1533
1534
1535 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1536 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1537 break;
1538 case TCP_LAST_ACK:
1539 set_bit(XPRT_CLOSING, &xprt->state);
1540 smp_mb__before_atomic();
1541 clear_bit(XPRT_CONNECTED, &xprt->state);
1542 smp_mb__after_atomic();
1543 break;
1544 case TCP_CLOSE:
1545 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1546 &transport->sock_state))
1547 xprt_clear_connecting(xprt);
1548 clear_bit(XPRT_CLOSING, &xprt->state);
1549
1550 xs_tcp_force_close(xprt);
1551 }
1552 out:
1553 read_unlock_bh(&sk->sk_callback_lock);
1554}
1555
1556static void xs_write_space(struct sock *sk)
1557{
1558 struct socket_wq *wq;
1559 struct rpc_xprt *xprt;
1560
1561 if (!sk->sk_socket)
1562 return;
1563 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1564
1565 if (unlikely(!(xprt = xprt_from_sock(sk))))
1566 return;
1567 rcu_read_lock();
1568 wq = rcu_dereference(sk->sk_wq);
1569 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1570 goto out;
1571
1572 if (xprt_write_space(xprt))
1573 sk->sk_write_pending--;
1574out:
1575 rcu_read_unlock();
1576}
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588static void xs_udp_write_space(struct sock *sk)
1589{
1590 read_lock_bh(&sk->sk_callback_lock);
1591
1592
1593 if (sock_writeable(sk))
1594 xs_write_space(sk);
1595
1596 read_unlock_bh(&sk->sk_callback_lock);
1597}
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609static void xs_tcp_write_space(struct sock *sk)
1610{
1611 read_lock_bh(&sk->sk_callback_lock);
1612
1613
1614 if (sk_stream_is_writeable(sk))
1615 xs_write_space(sk);
1616
1617 read_unlock_bh(&sk->sk_callback_lock);
1618}
1619
1620static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1621{
1622 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1623 struct sock *sk = transport->inet;
1624
1625 if (transport->rcvsize) {
1626 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1627 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1628 }
1629 if (transport->sndsize) {
1630 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1631 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1632 sk->sk_write_space(sk);
1633 }
1634}
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1645{
1646 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1647
1648 transport->sndsize = 0;
1649 if (sndsize)
1650 transport->sndsize = sndsize + 1024;
1651 transport->rcvsize = 0;
1652 if (rcvsize)
1653 transport->rcvsize = rcvsize + 1024;
1654
1655 xs_udp_do_set_buffer_size(xprt);
1656}
1657
1658
1659
1660
1661
1662
1663
1664
1665static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1666{
1667 spin_lock_bh(&xprt->transport_lock);
1668 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1669 spin_unlock_bh(&xprt->transport_lock);
1670}
1671
1672static int xs_get_random_port(void)
1673{
1674 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1675 unsigned short range;
1676 unsigned short rand;
1677
1678 if (max < min)
1679 return -EADDRINUSE;
1680 range = max - min + 1;
1681 rand = (unsigned short) prandom_u32() % range;
1682 return rand + min;
1683}
1684
1685
1686
1687
1688
1689
1690
1691
1692static void xs_sock_set_reuseport(struct socket *sock)
1693{
1694 int opt = 1;
1695
1696 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1697 (char *)&opt, sizeof(opt));
1698}
1699
1700static unsigned short xs_sock_getport(struct socket *sock)
1701{
1702 struct sockaddr_storage buf;
1703 unsigned short port = 0;
1704
1705 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1706 goto out;
1707 switch (buf.ss_family) {
1708 case AF_INET6:
1709 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1710 break;
1711 case AF_INET:
1712 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1713 }
1714out:
1715 return port;
1716}
1717
1718
1719
1720
1721
1722
1723
1724static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1725{
1726 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1727
1728 rpc_set_port(xs_addr(xprt), port);
1729 xs_update_peer_port(xprt);
1730}
1731
1732static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1733{
1734 if (transport->srcport == 0)
1735 transport->srcport = xs_sock_getport(sock);
1736}
1737
1738static int xs_get_srcport(struct sock_xprt *transport)
1739{
1740 int port = transport->srcport;
1741
1742 if (port == 0 && transport->xprt.resvport)
1743 port = xs_get_random_port();
1744 return port;
1745}
1746
1747static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1748{
1749 if (transport->srcport != 0)
1750 transport->srcport = 0;
1751 if (!transport->xprt.resvport)
1752 return 0;
1753 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1754 return xprt_max_resvport;
1755 return --port;
1756}
1757static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1758{
1759 struct sockaddr_storage myaddr;
1760 int err, nloop = 0;
1761 int port = xs_get_srcport(transport);
1762 unsigned short last;
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779 if (port <= 0)
1780 return port;
1781
1782 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1783 do {
1784 rpc_set_port((struct sockaddr *)&myaddr, port);
1785 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1786 transport->xprt.addrlen);
1787 if (err == 0) {
1788 transport->srcport = port;
1789 break;
1790 }
1791 last = port;
1792 port = xs_next_srcport(transport, port);
1793 if (port > last)
1794 nloop++;
1795 } while (err == -EADDRINUSE && nloop != 2);
1796
1797 if (myaddr.ss_family == AF_INET)
1798 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1799 &((struct sockaddr_in *)&myaddr)->sin_addr,
1800 port, err ? "failed" : "ok", err);
1801 else
1802 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1803 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1804 port, err ? "failed" : "ok", err);
1805 return err;
1806}
1807
1808
1809
1810
1811static void xs_local_rpcbind(struct rpc_task *task)
1812{
1813 xprt_set_bound(task->tk_xprt);
1814}
1815
1816static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1817{
1818}
1819
1820#ifdef CONFIG_DEBUG_LOCK_ALLOC
1821static struct lock_class_key xs_key[2];
1822static struct lock_class_key xs_slock_key[2];
1823
1824static inline void xs_reclassify_socketu(struct socket *sock)
1825{
1826 struct sock *sk = sock->sk;
1827
1828 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1829 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1830}
1831
1832static inline void xs_reclassify_socket4(struct socket *sock)
1833{
1834 struct sock *sk = sock->sk;
1835
1836 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1837 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1838}
1839
1840static inline void xs_reclassify_socket6(struct socket *sock)
1841{
1842 struct sock *sk = sock->sk;
1843
1844 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1845 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1846}
1847
1848static inline void xs_reclassify_socket(int family, struct socket *sock)
1849{
1850 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1851 return;
1852
1853 switch (family) {
1854 case AF_LOCAL:
1855 xs_reclassify_socketu(sock);
1856 break;
1857 case AF_INET:
1858 xs_reclassify_socket4(sock);
1859 break;
1860 case AF_INET6:
1861 xs_reclassify_socket6(sock);
1862 break;
1863 }
1864}
1865#else
1866static inline void xs_reclassify_socket(int family, struct socket *sock)
1867{
1868}
1869#endif
1870
1871static void xs_dummy_setup_socket(struct work_struct *work)
1872{
1873}
1874
1875static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1876 struct sock_xprt *transport, int family, int type,
1877 int protocol, bool reuseport)
1878{
1879 struct file *filp;
1880 struct socket *sock;
1881 int err;
1882
1883 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1884 if (err < 0) {
1885 dprintk("RPC: can't create %d transport socket (%d).\n",
1886 protocol, -err);
1887 goto out;
1888 }
1889 xs_reclassify_socket(family, sock);
1890
1891 if (reuseport)
1892 xs_sock_set_reuseport(sock);
1893
1894 err = xs_bind(transport, sock);
1895 if (err) {
1896 sock_release(sock);
1897 goto out;
1898 }
1899
1900 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1901 if (IS_ERR(filp))
1902 return ERR_CAST(filp);
1903 transport->file = filp;
1904
1905 return sock;
1906out:
1907 return ERR_PTR(err);
1908}
1909
1910static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1911 struct socket *sock)
1912{
1913 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1914 xprt);
1915
1916 if (!transport->inet) {
1917 struct sock *sk = sock->sk;
1918
1919 write_lock_bh(&sk->sk_callback_lock);
1920
1921 xs_save_old_callbacks(transport, sk);
1922
1923 sk->sk_user_data = xprt;
1924 sk->sk_data_ready = xs_data_ready;
1925 sk->sk_write_space = xs_udp_write_space;
1926 sock_set_flag(sk, SOCK_FASYNC);
1927 sk->sk_error_report = xs_error_report;
1928
1929 xprt_clear_connected(xprt);
1930
1931
1932 transport->sock = sock;
1933 transport->inet = sk;
1934
1935 write_unlock_bh(&sk->sk_callback_lock);
1936 }
1937
1938 xs_stream_start_connect(transport);
1939
1940 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1941}
1942
1943
1944
1945
1946
1947static int xs_local_setup_socket(struct sock_xprt *transport)
1948{
1949 struct rpc_xprt *xprt = &transport->xprt;
1950 struct file *filp;
1951 struct socket *sock;
1952 int status = -EIO;
1953
1954 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1955 SOCK_STREAM, 0, &sock, 1);
1956 if (status < 0) {
1957 dprintk("RPC: can't create AF_LOCAL "
1958 "transport socket (%d).\n", -status);
1959 goto out;
1960 }
1961 xs_reclassify_socket(AF_LOCAL, sock);
1962
1963 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1964 if (IS_ERR(filp)) {
1965 status = PTR_ERR(filp);
1966 goto out;
1967 }
1968 transport->file = filp;
1969
1970 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1971 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1972
1973 status = xs_local_finish_connecting(xprt, sock);
1974 trace_rpc_socket_connect(xprt, sock, status);
1975 switch (status) {
1976 case 0:
1977 dprintk("RPC: xprt %p connected to %s\n",
1978 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1979 xprt->stat.connect_count++;
1980 xprt->stat.connect_time += (long)jiffies -
1981 xprt->stat.connect_start;
1982 xprt_set_connected(xprt);
1983 case -ENOBUFS:
1984 break;
1985 case -ENOENT:
1986 dprintk("RPC: xprt %p: socket %s does not exist\n",
1987 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1988 break;
1989 case -ECONNREFUSED:
1990 dprintk("RPC: xprt %p: connection refused for %s\n",
1991 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1992 break;
1993 default:
1994 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1995 __func__, -status,
1996 xprt->address_strings[RPC_DISPLAY_ADDR]);
1997 }
1998
1999out:
2000 xprt_clear_connecting(xprt);
2001 xprt_wake_pending_tasks(xprt, status);
2002 return status;
2003}
2004
2005static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2006{
2007 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2008 int ret;
2009
2010 if (RPC_IS_ASYNC(task)) {
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020 task->tk_rpc_status = -ENOTCONN;
2021 rpc_exit(task, -ENOTCONN);
2022 return;
2023 }
2024 ret = xs_local_setup_socket(transport);
2025 if (ret && !RPC_IS_SOFTCONN(task))
2026 msleep_interruptible(15000);
2027}
2028
2029#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2030
2031
2032
2033
2034
2035static void xs_set_memalloc(struct rpc_xprt *xprt)
2036{
2037 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2038 xprt);
2039
2040
2041
2042
2043
2044 if (!transport->inet)
2045 return;
2046 if (atomic_read(&xprt->swapper))
2047 sk_set_memalloc(transport->inet);
2048}
2049
2050
2051
2052
2053
2054
2055
2056
2057static int
2058xs_enable_swap(struct rpc_xprt *xprt)
2059{
2060 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2061
2062 if (atomic_inc_return(&xprt->swapper) != 1)
2063 return 0;
2064 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2065 return -ERESTARTSYS;
2066 if (xs->inet)
2067 sk_set_memalloc(xs->inet);
2068 xprt_release_xprt(xprt, NULL);
2069 return 0;
2070}
2071
2072
2073
2074
2075
2076
2077
2078
2079static void
2080xs_disable_swap(struct rpc_xprt *xprt)
2081{
2082 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2083
2084 if (!atomic_dec_and_test(&xprt->swapper))
2085 return;
2086 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2087 return;
2088 if (xs->inet)
2089 sk_clear_memalloc(xs->inet);
2090 xprt_release_xprt(xprt, NULL);
2091}
2092#else
2093static void xs_set_memalloc(struct rpc_xprt *xprt)
2094{
2095}
2096
2097static int
2098xs_enable_swap(struct rpc_xprt *xprt)
2099{
2100 return -EINVAL;
2101}
2102
2103static void
2104xs_disable_swap(struct rpc_xprt *xprt)
2105{
2106}
2107#endif
2108
2109static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2110{
2111 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2112
2113 if (!transport->inet) {
2114 struct sock *sk = sock->sk;
2115
2116 write_lock_bh(&sk->sk_callback_lock);
2117
2118 xs_save_old_callbacks(transport, sk);
2119
2120 sk->sk_user_data = xprt;
2121 sk->sk_data_ready = xs_data_ready;
2122 sk->sk_write_space = xs_udp_write_space;
2123 sock_set_flag(sk, SOCK_FASYNC);
2124
2125 xprt_set_connected(xprt);
2126
2127
2128 transport->sock = sock;
2129 transport->inet = sk;
2130
2131 xs_set_memalloc(xprt);
2132
2133 write_unlock_bh(&sk->sk_callback_lock);
2134 }
2135 xs_udp_do_set_buffer_size(xprt);
2136
2137 xprt->stat.connect_start = jiffies;
2138}
2139
2140static void xs_udp_setup_socket(struct work_struct *work)
2141{
2142 struct sock_xprt *transport =
2143 container_of(work, struct sock_xprt, connect_worker.work);
2144 struct rpc_xprt *xprt = &transport->xprt;
2145 struct socket *sock;
2146 int status = -EIO;
2147
2148 sock = xs_create_sock(xprt, transport,
2149 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2150 IPPROTO_UDP, false);
2151 if (IS_ERR(sock))
2152 goto out;
2153
2154 dprintk("RPC: worker connecting xprt %p via %s to "
2155 "%s (port %s)\n", xprt,
2156 xprt->address_strings[RPC_DISPLAY_PROTO],
2157 xprt->address_strings[RPC_DISPLAY_ADDR],
2158 xprt->address_strings[RPC_DISPLAY_PORT]);
2159
2160 xs_udp_finish_connecting(xprt, sock);
2161 trace_rpc_socket_connect(xprt, sock, 0);
2162 status = 0;
2163out:
2164 xprt_clear_connecting(xprt);
2165 xprt_unlock_connect(xprt, transport);
2166 xprt_wake_pending_tasks(xprt, status);
2167}
2168
2169
2170
2171
2172
2173
2174
2175
2176static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2177{
2178 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2179 struct socket *sock = transport->sock;
2180 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2181
2182 if (sock == NULL)
2183 return;
2184 switch (skst) {
2185 default:
2186 kernel_sock_shutdown(sock, SHUT_RDWR);
2187 trace_rpc_socket_shutdown(xprt, sock);
2188 break;
2189 case TCP_CLOSE:
2190 case TCP_TIME_WAIT:
2191 xs_reset_transport(transport);
2192 }
2193}
2194
2195static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2196 struct socket *sock)
2197{
2198 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2199 unsigned int keepidle;
2200 unsigned int keepcnt;
2201 unsigned int opt_on = 1;
2202 unsigned int timeo;
2203
2204 spin_lock_bh(&xprt->transport_lock);
2205 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2206 keepcnt = xprt->timeout->to_retries + 1;
2207 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2208 (xprt->timeout->to_retries + 1);
2209 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2210 spin_unlock_bh(&xprt->transport_lock);
2211
2212
2213 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2214 (char *)&opt_on, sizeof(opt_on));
2215 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2216 (char *)&keepidle, sizeof(keepidle));
2217 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2218 (char *)&keepidle, sizeof(keepidle));
2219 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2220 (char *)&keepcnt, sizeof(keepcnt));
2221
2222
2223 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2224 (char *)&timeo, sizeof(timeo));
2225}
2226
2227static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2228 unsigned long connect_timeout,
2229 unsigned long reconnect_timeout)
2230{
2231 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2232 struct rpc_timeout to;
2233 unsigned long initval;
2234
2235 spin_lock_bh(&xprt->transport_lock);
2236 if (reconnect_timeout < xprt->max_reconnect_timeout)
2237 xprt->max_reconnect_timeout = reconnect_timeout;
2238 if (connect_timeout < xprt->connect_timeout) {
2239 memcpy(&to, xprt->timeout, sizeof(to));
2240 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2241
2242 if (initval < XS_TCP_INIT_REEST_TO << 1)
2243 initval = XS_TCP_INIT_REEST_TO << 1;
2244 to.to_initval = initval;
2245 to.to_maxval = initval;
2246 memcpy(&transport->tcp_timeout, &to,
2247 sizeof(transport->tcp_timeout));
2248 xprt->timeout = &transport->tcp_timeout;
2249 xprt->connect_timeout = connect_timeout;
2250 }
2251 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2252 spin_unlock_bh(&xprt->transport_lock);
2253}
2254
2255static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2256{
2257 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2258 int ret = -ENOTCONN;
2259
2260 if (!transport->inet) {
2261 struct sock *sk = sock->sk;
2262 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2263
2264
2265
2266
2267
2268
2269
2270
2271 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2272 (char *)&addr_pref, sizeof(addr_pref));
2273
2274 xs_tcp_set_socket_timeouts(xprt, sock);
2275
2276 write_lock_bh(&sk->sk_callback_lock);
2277
2278 xs_save_old_callbacks(transport, sk);
2279
2280 sk->sk_user_data = xprt;
2281 sk->sk_data_ready = xs_data_ready;
2282 sk->sk_state_change = xs_tcp_state_change;
2283 sk->sk_write_space = xs_tcp_write_space;
2284 sock_set_flag(sk, SOCK_FASYNC);
2285 sk->sk_error_report = xs_error_report;
2286
2287
2288 sock_reset_flag(sk, SOCK_LINGER);
2289 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2290
2291 xprt_clear_connected(xprt);
2292
2293
2294 transport->sock = sock;
2295 transport->inet = sk;
2296
2297 write_unlock_bh(&sk->sk_callback_lock);
2298 }
2299
2300 if (!xprt_bound(xprt))
2301 goto out;
2302
2303 xs_set_memalloc(xprt);
2304
2305 xs_stream_start_connect(transport);
2306
2307
2308 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2309 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2310 switch (ret) {
2311 case 0:
2312 xs_set_srcport(transport, sock);
2313
2314 case -EINPROGRESS:
2315
2316 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2317 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2318 break;
2319 case -EADDRNOTAVAIL:
2320
2321 transport->srcport = 0;
2322 }
2323out:
2324 return ret;
2325}
2326
2327
2328
2329
2330
2331
2332
2333static void xs_tcp_setup_socket(struct work_struct *work)
2334{
2335 struct sock_xprt *transport =
2336 container_of(work, struct sock_xprt, connect_worker.work);
2337 struct socket *sock = transport->sock;
2338 struct rpc_xprt *xprt = &transport->xprt;
2339 int status = -EIO;
2340
2341 if (!sock) {
2342 sock = xs_create_sock(xprt, transport,
2343 xs_addr(xprt)->sa_family, SOCK_STREAM,
2344 IPPROTO_TCP, true);
2345 if (IS_ERR(sock)) {
2346 status = PTR_ERR(sock);
2347 goto out;
2348 }
2349 }
2350
2351 dprintk("RPC: worker connecting xprt %p via %s to "
2352 "%s (port %s)\n", xprt,
2353 xprt->address_strings[RPC_DISPLAY_PROTO],
2354 xprt->address_strings[RPC_DISPLAY_ADDR],
2355 xprt->address_strings[RPC_DISPLAY_PORT]);
2356
2357 status = xs_tcp_finish_connecting(xprt, sock);
2358 trace_rpc_socket_connect(xprt, sock, status);
2359 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2360 xprt, -status, xprt_connected(xprt),
2361 sock->sk->sk_state);
2362 switch (status) {
2363 default:
2364 printk("%s: connect returned unhandled error %d\n",
2365 __func__, status);
2366
2367 case -EADDRNOTAVAIL:
2368
2369
2370
2371 xs_tcp_force_close(xprt);
2372 break;
2373 case 0:
2374 case -EINPROGRESS:
2375 case -EALREADY:
2376 xprt_unlock_connect(xprt, transport);
2377 return;
2378 case -EINVAL:
2379
2380
2381
2382 case -ECONNREFUSED:
2383 case -ECONNRESET:
2384 case -ENETDOWN:
2385 case -ENETUNREACH:
2386 case -EHOSTUNREACH:
2387 case -EADDRINUSE:
2388 case -ENOBUFS:
2389
2390
2391
2392
2393
2394 xprt_wake_pending_tasks(xprt, status);
2395 xs_tcp_force_close(xprt);
2396 goto out;
2397 }
2398 status = -EAGAIN;
2399out:
2400 xprt_clear_connecting(xprt);
2401 xprt_unlock_connect(xprt, transport);
2402 xprt_wake_pending_tasks(xprt, status);
2403}
2404
2405static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2406{
2407 unsigned long start, now = jiffies;
2408
2409 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2410 if (time_after(start, now))
2411 return start - now;
2412 return 0;
2413}
2414
2415static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2416{
2417 xprt->reestablish_timeout <<= 1;
2418 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2419 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2420 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2421 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2422}
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2439{
2440 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2441 unsigned long delay = 0;
2442
2443 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2444
2445 if (transport->sock != NULL) {
2446 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2447 "seconds\n",
2448 xprt, xprt->reestablish_timeout / HZ);
2449
2450
2451 xs_reset_transport(transport);
2452
2453 delay = xs_reconnect_delay(xprt);
2454 xs_reconnect_backoff(xprt);
2455
2456 } else
2457 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2458
2459 queue_delayed_work(xprtiod_workqueue,
2460 &transport->connect_worker,
2461 delay);
2462}
2463
2464
2465
2466
2467
2468
2469
2470static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2471{
2472 long idle_time = 0;
2473
2474 if (xprt_connected(xprt))
2475 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2476
2477 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2478 "%llu %llu %lu %llu %llu\n",
2479 xprt->stat.bind_count,
2480 xprt->stat.connect_count,
2481 xprt->stat.connect_time / HZ,
2482 idle_time,
2483 xprt->stat.sends,
2484 xprt->stat.recvs,
2485 xprt->stat.bad_xids,
2486 xprt->stat.req_u,
2487 xprt->stat.bklog_u,
2488 xprt->stat.max_slots,
2489 xprt->stat.sending_u,
2490 xprt->stat.pending_u);
2491}
2492
2493
2494
2495
2496
2497
2498
2499static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2500{
2501 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2502
2503 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2504 "%lu %llu %llu\n",
2505 transport->srcport,
2506 xprt->stat.bind_count,
2507 xprt->stat.sends,
2508 xprt->stat.recvs,
2509 xprt->stat.bad_xids,
2510 xprt->stat.req_u,
2511 xprt->stat.bklog_u,
2512 xprt->stat.max_slots,
2513 xprt->stat.sending_u,
2514 xprt->stat.pending_u);
2515}
2516
2517
2518
2519
2520
2521
2522
2523static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2524{
2525 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2526 long idle_time = 0;
2527
2528 if (xprt_connected(xprt))
2529 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2530
2531 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2532 "%llu %llu %lu %llu %llu\n",
2533 transport->srcport,
2534 xprt->stat.bind_count,
2535 xprt->stat.connect_count,
2536 xprt->stat.connect_time / HZ,
2537 idle_time,
2538 xprt->stat.sends,
2539 xprt->stat.recvs,
2540 xprt->stat.bad_xids,
2541 xprt->stat.req_u,
2542 xprt->stat.bklog_u,
2543 xprt->stat.max_slots,
2544 xprt->stat.sending_u,
2545 xprt->stat.pending_u);
2546}
2547
2548
2549
2550
2551
2552
2553static int bc_malloc(struct rpc_task *task)
2554{
2555 struct rpc_rqst *rqst = task->tk_rqstp;
2556 size_t size = rqst->rq_callsize;
2557 struct page *page;
2558 struct rpc_buffer *buf;
2559
2560 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2561 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2562 size);
2563 return -EINVAL;
2564 }
2565
2566 page = alloc_page(GFP_KERNEL);
2567 if (!page)
2568 return -ENOMEM;
2569
2570 buf = page_address(page);
2571 buf->len = PAGE_SIZE;
2572
2573 rqst->rq_buffer = buf->data;
2574 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2575 return 0;
2576}
2577
2578
2579
2580
2581static void bc_free(struct rpc_task *task)
2582{
2583 void *buffer = task->tk_rqstp->rq_buffer;
2584 struct rpc_buffer *buf;
2585
2586 buf = container_of(buffer, struct rpc_buffer, data);
2587 free_page((unsigned long)buf);
2588}
2589
2590
2591
2592
2593
2594static int bc_sendto(struct rpc_rqst *req)
2595{
2596 int len;
2597 struct xdr_buf *xbufp = &req->rq_snd_buf;
2598 struct sock_xprt *transport =
2599 container_of(req->rq_xprt, struct sock_xprt, xprt);
2600 unsigned long headoff;
2601 unsigned long tailoff;
2602 struct page *tailpage;
2603 struct msghdr msg = {
2604 .msg_flags = MSG_MORE
2605 };
2606 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2607 (u32)xbufp->len);
2608 struct kvec iov = {
2609 .iov_base = &marker,
2610 .iov_len = sizeof(marker),
2611 };
2612
2613 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len);
2614 if (len != iov.iov_len)
2615 return -EAGAIN;
2616
2617 tailpage = NULL;
2618 if (xbufp->tail[0].iov_len)
2619 tailpage = virt_to_page(xbufp->tail[0].iov_base);
2620 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2621 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2622 len = svc_send_common(transport->sock, xbufp,
2623 virt_to_page(xbufp->head[0].iov_base), headoff,
2624 tailpage, tailoff);
2625 if (len != xbufp->len)
2626 return -EAGAIN;
2627 return len;
2628}
2629
2630
2631
2632
2633static int bc_send_request(struct rpc_rqst *req)
2634{
2635 struct svc_xprt *xprt;
2636 int len;
2637
2638 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2639
2640
2641
2642 xprt = req->rq_xprt->bc_xprt;
2643
2644
2645
2646
2647
2648 mutex_lock(&xprt->xpt_mutex);
2649 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2650 len = -ENOTCONN;
2651 else
2652 len = bc_sendto(req);
2653 mutex_unlock(&xprt->xpt_mutex);
2654
2655 if (len > 0)
2656 len = 0;
2657
2658 return len;
2659}
2660
2661
2662
2663
2664
2665static void bc_close(struct rpc_xprt *xprt)
2666{
2667}
2668
2669
2670
2671
2672
2673
2674static void bc_destroy(struct rpc_xprt *xprt)
2675{
2676 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2677
2678 xs_xprt_free(xprt);
2679 module_put(THIS_MODULE);
2680}
2681
2682static const struct rpc_xprt_ops xs_local_ops = {
2683 .reserve_xprt = xprt_reserve_xprt,
2684 .release_xprt = xprt_release_xprt,
2685 .alloc_slot = xprt_alloc_slot,
2686 .free_slot = xprt_free_slot,
2687 .rpcbind = xs_local_rpcbind,
2688 .set_port = xs_local_set_port,
2689 .connect = xs_local_connect,
2690 .buf_alloc = rpc_malloc,
2691 .buf_free = rpc_free,
2692 .prepare_request = xs_stream_prepare_request,
2693 .send_request = xs_local_send_request,
2694 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2695 .close = xs_close,
2696 .destroy = xs_destroy,
2697 .print_stats = xs_local_print_stats,
2698 .enable_swap = xs_enable_swap,
2699 .disable_swap = xs_disable_swap,
2700};
2701
2702static const struct rpc_xprt_ops xs_udp_ops = {
2703 .set_buffer_size = xs_udp_set_buffer_size,
2704 .reserve_xprt = xprt_reserve_xprt_cong,
2705 .release_xprt = xprt_release_xprt_cong,
2706 .alloc_slot = xprt_alloc_slot,
2707 .free_slot = xprt_free_slot,
2708 .rpcbind = rpcb_getport_async,
2709 .set_port = xs_set_port,
2710 .connect = xs_connect,
2711 .buf_alloc = rpc_malloc,
2712 .buf_free = rpc_free,
2713 .send_request = xs_udp_send_request,
2714 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2715 .timer = xs_udp_timer,
2716 .release_request = xprt_release_rqst_cong,
2717 .close = xs_close,
2718 .destroy = xs_destroy,
2719 .print_stats = xs_udp_print_stats,
2720 .enable_swap = xs_enable_swap,
2721 .disable_swap = xs_disable_swap,
2722 .inject_disconnect = xs_inject_disconnect,
2723};
2724
2725static const struct rpc_xprt_ops xs_tcp_ops = {
2726 .reserve_xprt = xprt_reserve_xprt,
2727 .release_xprt = xprt_release_xprt,
2728 .alloc_slot = xprt_alloc_slot,
2729 .free_slot = xprt_free_slot,
2730 .rpcbind = rpcb_getport_async,
2731 .set_port = xs_set_port,
2732 .connect = xs_connect,
2733 .buf_alloc = rpc_malloc,
2734 .buf_free = rpc_free,
2735 .prepare_request = xs_stream_prepare_request,
2736 .send_request = xs_tcp_send_request,
2737 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2738 .close = xs_tcp_shutdown,
2739 .destroy = xs_destroy,
2740 .set_connect_timeout = xs_tcp_set_connect_timeout,
2741 .print_stats = xs_tcp_print_stats,
2742 .enable_swap = xs_enable_swap,
2743 .disable_swap = xs_disable_swap,
2744 .inject_disconnect = xs_inject_disconnect,
2745#ifdef CONFIG_SUNRPC_BACKCHANNEL
2746 .bc_setup = xprt_setup_bc,
2747 .bc_maxpayload = xs_tcp_bc_maxpayload,
2748 .bc_free_rqst = xprt_free_bc_rqst,
2749 .bc_destroy = xprt_destroy_bc,
2750#endif
2751};
2752
2753
2754
2755
2756
2757static const struct rpc_xprt_ops bc_tcp_ops = {
2758 .reserve_xprt = xprt_reserve_xprt,
2759 .release_xprt = xprt_release_xprt,
2760 .alloc_slot = xprt_alloc_slot,
2761 .free_slot = xprt_free_slot,
2762 .buf_alloc = bc_malloc,
2763 .buf_free = bc_free,
2764 .send_request = bc_send_request,
2765 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2766 .close = bc_close,
2767 .destroy = bc_destroy,
2768 .print_stats = xs_tcp_print_stats,
2769 .enable_swap = xs_enable_swap,
2770 .disable_swap = xs_disable_swap,
2771 .inject_disconnect = xs_inject_disconnect,
2772};
2773
2774static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2775{
2776 static const struct sockaddr_in sin = {
2777 .sin_family = AF_INET,
2778 .sin_addr.s_addr = htonl(INADDR_ANY),
2779 };
2780 static const struct sockaddr_in6 sin6 = {
2781 .sin6_family = AF_INET6,
2782 .sin6_addr = IN6ADDR_ANY_INIT,
2783 };
2784
2785 switch (family) {
2786 case AF_LOCAL:
2787 break;
2788 case AF_INET:
2789 memcpy(sap, &sin, sizeof(sin));
2790 break;
2791 case AF_INET6:
2792 memcpy(sap, &sin6, sizeof(sin6));
2793 break;
2794 default:
2795 dprintk("RPC: %s: Bad address family\n", __func__);
2796 return -EAFNOSUPPORT;
2797 }
2798 return 0;
2799}
2800
2801static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2802 unsigned int slot_table_size,
2803 unsigned int max_slot_table_size)
2804{
2805 struct rpc_xprt *xprt;
2806 struct sock_xprt *new;
2807
2808 if (args->addrlen > sizeof(xprt->addr)) {
2809 dprintk("RPC: xs_setup_xprt: address too large\n");
2810 return ERR_PTR(-EBADF);
2811 }
2812
2813 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2814 max_slot_table_size);
2815 if (xprt == NULL) {
2816 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2817 "rpc_xprt\n");
2818 return ERR_PTR(-ENOMEM);
2819 }
2820
2821 new = container_of(xprt, struct sock_xprt, xprt);
2822 mutex_init(&new->recv_mutex);
2823 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2824 xprt->addrlen = args->addrlen;
2825 if (args->srcaddr)
2826 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2827 else {
2828 int err;
2829 err = xs_init_anyaddr(args->dstaddr->sa_family,
2830 (struct sockaddr *)&new->srcaddr);
2831 if (err != 0) {
2832 xprt_free(xprt);
2833 return ERR_PTR(err);
2834 }
2835 }
2836
2837 return xprt;
2838}
2839
2840static const struct rpc_timeout xs_local_default_timeout = {
2841 .to_initval = 10 * HZ,
2842 .to_maxval = 10 * HZ,
2843 .to_retries = 2,
2844};
2845
2846
2847
2848
2849
2850
2851
2852static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2853{
2854 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2855 struct sock_xprt *transport;
2856 struct rpc_xprt *xprt;
2857 struct rpc_xprt *ret;
2858
2859 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2860 xprt_max_tcp_slot_table_entries);
2861 if (IS_ERR(xprt))
2862 return xprt;
2863 transport = container_of(xprt, struct sock_xprt, xprt);
2864
2865 xprt->prot = 0;
2866 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2867
2868 xprt->bind_timeout = XS_BIND_TO;
2869 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2870 xprt->idle_timeout = XS_IDLE_DISC_TO;
2871
2872 xprt->ops = &xs_local_ops;
2873 xprt->timeout = &xs_local_default_timeout;
2874
2875 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2876 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2877
2878 switch (sun->sun_family) {
2879 case AF_LOCAL:
2880 if (sun->sun_path[0] != '/') {
2881 dprintk("RPC: bad AF_LOCAL address: %s\n",
2882 sun->sun_path);
2883 ret = ERR_PTR(-EINVAL);
2884 goto out_err;
2885 }
2886 xprt_set_bound(xprt);
2887 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2888 ret = ERR_PTR(xs_local_setup_socket(transport));
2889 if (ret)
2890 goto out_err;
2891 break;
2892 default:
2893 ret = ERR_PTR(-EAFNOSUPPORT);
2894 goto out_err;
2895 }
2896
2897 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2898 xprt->address_strings[RPC_DISPLAY_ADDR]);
2899
2900 if (try_module_get(THIS_MODULE))
2901 return xprt;
2902 ret = ERR_PTR(-EINVAL);
2903out_err:
2904 xs_xprt_free(xprt);
2905 return ret;
2906}
2907
2908static const struct rpc_timeout xs_udp_default_timeout = {
2909 .to_initval = 5 * HZ,
2910 .to_maxval = 30 * HZ,
2911 .to_increment = 5 * HZ,
2912 .to_retries = 5,
2913};
2914
2915
2916
2917
2918
2919
2920static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2921{
2922 struct sockaddr *addr = args->dstaddr;
2923 struct rpc_xprt *xprt;
2924 struct sock_xprt *transport;
2925 struct rpc_xprt *ret;
2926
2927 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2928 xprt_udp_slot_table_entries);
2929 if (IS_ERR(xprt))
2930 return xprt;
2931 transport = container_of(xprt, struct sock_xprt, xprt);
2932
2933 xprt->prot = IPPROTO_UDP;
2934
2935 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2936
2937 xprt->bind_timeout = XS_BIND_TO;
2938 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2939 xprt->idle_timeout = XS_IDLE_DISC_TO;
2940
2941 xprt->ops = &xs_udp_ops;
2942
2943 xprt->timeout = &xs_udp_default_timeout;
2944
2945 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2946 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2947
2948 switch (addr->sa_family) {
2949 case AF_INET:
2950 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2951 xprt_set_bound(xprt);
2952
2953 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2954 break;
2955 case AF_INET6:
2956 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2957 xprt_set_bound(xprt);
2958
2959 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2960 break;
2961 default:
2962 ret = ERR_PTR(-EAFNOSUPPORT);
2963 goto out_err;
2964 }
2965
2966 if (xprt_bound(xprt))
2967 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2968 xprt->address_strings[RPC_DISPLAY_ADDR],
2969 xprt->address_strings[RPC_DISPLAY_PORT],
2970 xprt->address_strings[RPC_DISPLAY_PROTO]);
2971 else
2972 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2973 xprt->address_strings[RPC_DISPLAY_ADDR],
2974 xprt->address_strings[RPC_DISPLAY_PROTO]);
2975
2976 if (try_module_get(THIS_MODULE))
2977 return xprt;
2978 ret = ERR_PTR(-EINVAL);
2979out_err:
2980 xs_xprt_free(xprt);
2981 return ret;
2982}
2983
2984static const struct rpc_timeout xs_tcp_default_timeout = {
2985 .to_initval = 60 * HZ,
2986 .to_maxval = 60 * HZ,
2987 .to_retries = 2,
2988};
2989
2990
2991
2992
2993
2994
2995static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2996{
2997 struct sockaddr *addr = args->dstaddr;
2998 struct rpc_xprt *xprt;
2999 struct sock_xprt *transport;
3000 struct rpc_xprt *ret;
3001 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3002
3003 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3004 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3005
3006 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3007 max_slot_table_size);
3008 if (IS_ERR(xprt))
3009 return xprt;
3010 transport = container_of(xprt, struct sock_xprt, xprt);
3011
3012 xprt->prot = IPPROTO_TCP;
3013 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3014
3015 xprt->bind_timeout = XS_BIND_TO;
3016 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3017 xprt->idle_timeout = XS_IDLE_DISC_TO;
3018
3019 xprt->ops = &xs_tcp_ops;
3020 xprt->timeout = &xs_tcp_default_timeout;
3021
3022 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3023 xprt->connect_timeout = xprt->timeout->to_initval *
3024 (xprt->timeout->to_retries + 1);
3025
3026 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3027 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3028
3029 switch (addr->sa_family) {
3030 case AF_INET:
3031 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3032 xprt_set_bound(xprt);
3033
3034 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3035 break;
3036 case AF_INET6:
3037 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3038 xprt_set_bound(xprt);
3039
3040 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3041 break;
3042 default:
3043 ret = ERR_PTR(-EAFNOSUPPORT);
3044 goto out_err;
3045 }
3046
3047 if (xprt_bound(xprt))
3048 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3049 xprt->address_strings[RPC_DISPLAY_ADDR],
3050 xprt->address_strings[RPC_DISPLAY_PORT],
3051 xprt->address_strings[RPC_DISPLAY_PROTO]);
3052 else
3053 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3054 xprt->address_strings[RPC_DISPLAY_ADDR],
3055 xprt->address_strings[RPC_DISPLAY_PROTO]);
3056
3057 if (try_module_get(THIS_MODULE))
3058 return xprt;
3059 ret = ERR_PTR(-EINVAL);
3060out_err:
3061 xs_xprt_free(xprt);
3062 return ret;
3063}
3064
3065
3066
3067
3068
3069
3070static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3071{
3072 struct sockaddr *addr = args->dstaddr;
3073 struct rpc_xprt *xprt;
3074 struct sock_xprt *transport;
3075 struct svc_sock *bc_sock;
3076 struct rpc_xprt *ret;
3077
3078 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3079 xprt_tcp_slot_table_entries);
3080 if (IS_ERR(xprt))
3081 return xprt;
3082 transport = container_of(xprt, struct sock_xprt, xprt);
3083
3084 xprt->prot = IPPROTO_TCP;
3085 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3086 xprt->timeout = &xs_tcp_default_timeout;
3087
3088
3089 xprt_set_bound(xprt);
3090 xprt->bind_timeout = 0;
3091 xprt->reestablish_timeout = 0;
3092 xprt->idle_timeout = 0;
3093
3094 xprt->ops = &bc_tcp_ops;
3095
3096 switch (addr->sa_family) {
3097 case AF_INET:
3098 xs_format_peer_addresses(xprt, "tcp",
3099 RPCBIND_NETID_TCP);
3100 break;
3101 case AF_INET6:
3102 xs_format_peer_addresses(xprt, "tcp",
3103 RPCBIND_NETID_TCP6);
3104 break;
3105 default:
3106 ret = ERR_PTR(-EAFNOSUPPORT);
3107 goto out_err;
3108 }
3109
3110 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3111 xprt->address_strings[RPC_DISPLAY_ADDR],
3112 xprt->address_strings[RPC_DISPLAY_PORT],
3113 xprt->address_strings[RPC_DISPLAY_PROTO]);
3114
3115
3116
3117
3118
3119
3120
3121 xprt_get(xprt);
3122 args->bc_xprt->xpt_bc_xprt = xprt;
3123 xprt->bc_xprt = args->bc_xprt;
3124 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3125 transport->sock = bc_sock->sk_sock;
3126 transport->inet = bc_sock->sk_sk;
3127
3128
3129
3130
3131
3132 xprt_set_connected(xprt);
3133
3134 if (try_module_get(THIS_MODULE))
3135 return xprt;
3136
3137 args->bc_xprt->xpt_bc_xprt = NULL;
3138 args->bc_xprt->xpt_bc_xps = NULL;
3139 xprt_put(xprt);
3140 ret = ERR_PTR(-EINVAL);
3141out_err:
3142 xs_xprt_free(xprt);
3143 return ret;
3144}
3145
3146static struct xprt_class xs_local_transport = {
3147 .list = LIST_HEAD_INIT(xs_local_transport.list),
3148 .name = "named UNIX socket",
3149 .owner = THIS_MODULE,
3150 .ident = XPRT_TRANSPORT_LOCAL,
3151 .setup = xs_setup_local,
3152};
3153
3154static struct xprt_class xs_udp_transport = {
3155 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3156 .name = "udp",
3157 .owner = THIS_MODULE,
3158 .ident = XPRT_TRANSPORT_UDP,
3159 .setup = xs_setup_udp,
3160};
3161
3162static struct xprt_class xs_tcp_transport = {
3163 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3164 .name = "tcp",
3165 .owner = THIS_MODULE,
3166 .ident = XPRT_TRANSPORT_TCP,
3167 .setup = xs_setup_tcp,
3168};
3169
3170static struct xprt_class xs_bc_tcp_transport = {
3171 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3172 .name = "tcp NFSv4.1 backchannel",
3173 .owner = THIS_MODULE,
3174 .ident = XPRT_TRANSPORT_BC_TCP,
3175 .setup = xs_setup_bc_tcp,
3176};
3177
3178
3179
3180
3181
3182int init_socket_xprt(void)
3183{
3184 if (!sunrpc_table_header)
3185 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3186
3187 xprt_register_transport(&xs_local_transport);
3188 xprt_register_transport(&xs_udp_transport);
3189 xprt_register_transport(&xs_tcp_transport);
3190 xprt_register_transport(&xs_bc_tcp_transport);
3191
3192 return 0;
3193}
3194
3195
3196
3197
3198
3199void cleanup_socket_xprt(void)
3200{
3201 if (sunrpc_table_header) {
3202 unregister_sysctl_table(sunrpc_table_header);
3203 sunrpc_table_header = NULL;
3204 }
3205
3206 xprt_unregister_transport(&xs_local_transport);
3207 xprt_unregister_transport(&xs_udp_transport);
3208 xprt_unregister_transport(&xs_tcp_transport);
3209 xprt_unregister_transport(&xs_bc_tcp_transport);
3210}
3211
3212static int param_set_uint_minmax(const char *val,
3213 const struct kernel_param *kp,
3214 unsigned int min, unsigned int max)
3215{
3216 unsigned int num;
3217 int ret;
3218
3219 if (!val)
3220 return -EINVAL;
3221 ret = kstrtouint(val, 0, &num);
3222 if (ret)
3223 return ret;
3224 if (num < min || num > max)
3225 return -EINVAL;
3226 *((unsigned int *)kp->arg) = num;
3227 return 0;
3228}
3229
3230static int param_set_portnr(const char *val, const struct kernel_param *kp)
3231{
3232 return param_set_uint_minmax(val, kp,
3233 RPC_MIN_RESVPORT,
3234 RPC_MAX_RESVPORT);
3235}
3236
3237static const struct kernel_param_ops param_ops_portnr = {
3238 .set = param_set_portnr,
3239 .get = param_get_uint,
3240};
3241
3242#define param_check_portnr(name, p) \
3243 __param_check(name, p, unsigned int);
3244
3245module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3246module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3247
3248static int param_set_slot_table_size(const char *val,
3249 const struct kernel_param *kp)
3250{
3251 return param_set_uint_minmax(val, kp,
3252 RPC_MIN_SLOT_TABLE,
3253 RPC_MAX_SLOT_TABLE);
3254}
3255
3256static const struct kernel_param_ops param_ops_slot_table_size = {
3257 .set = param_set_slot_table_size,
3258 .get = param_get_uint,
3259};
3260
3261#define param_check_slot_table_size(name, p) \
3262 __param_check(name, p, unsigned int);
3263
3264static int param_set_max_slot_table_size(const char *val,
3265 const struct kernel_param *kp)
3266{
3267 return param_set_uint_minmax(val, kp,
3268 RPC_MIN_SLOT_TABLE,
3269 RPC_MAX_SLOT_TABLE_LIMIT);
3270}
3271
3272static const struct kernel_param_ops param_ops_max_slot_table_size = {
3273 .set = param_set_max_slot_table_size,
3274 .get = param_get_uint,
3275};
3276
3277#define param_check_max_slot_table_size(name, p) \
3278 __param_check(name, p, unsigned int);
3279
3280module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3281 slot_table_size, 0644);
3282module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3283 max_slot_table_size, 0644);
3284module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3285 slot_table_size, 0644);
3286