This source file includes following definitions.
- xs_pktdump
- xs_pktdump
- xprt_from_sock
- xs_addr
- xs_addr_un
- xs_addr_in
- xs_addr_in6
- xs_format_common_peer_addresses
- xs_format_common_peer_ports
- xs_format_peer_addresses
- xs_update_peer_port
- xs_free_peer_addresses
- xs_alloc_sparse_pages
- xs_sock_recvmsg
- xs_read_kvec
- xs_read_bvec
- xs_read_discard
- xs_flush_bvec
- xs_flush_bvec
- xs_read_xdr_buf
- xs_read_header
- xs_read_stream_request_done
- xs_read_stream_check_eor
- xs_read_stream_request
- xs_read_stream_headersize
- xs_read_stream_header
- xs_read_stream_call
- xs_read_stream_call
- xs_read_stream_reply
- xs_read_stream
- xs_poll_socket
- xs_poll_socket_readable
- xs_poll_check_readable
- xs_stream_data_receive
- xs_stream_data_receive_workfn
- xs_stream_reset_connect
- xs_stream_start_connect
- xs_sendmsg
- xs_send_kvec
- xs_send_pagedata
- xs_send_rm_and_kvec
- xs_sendpages
- xs_nospace
- xs_stream_prepare_request
- xs_send_request_was_aborted
- xs_stream_record_marker
- xs_local_send_request
- xs_udp_send_request
- xs_tcp_send_request
- xs_save_old_callbacks
- xs_restore_old_callbacks
- xs_sock_reset_state_flags
- xs_run_error_worker
- xs_sock_reset_connection_flags
- xs_error_report
- xs_reset_transport
- xs_close
- xs_inject_disconnect
- xs_xprt_free
- xs_destroy
- xs_udp_data_read_skb
- xs_udp_data_receive
- xs_udp_data_receive_workfn
- xs_data_ready
- xs_tcp_force_close
- xs_tcp_bc_maxpayload
- xs_tcp_state_change
- xs_write_space
- xs_udp_write_space
- xs_tcp_write_space
- xs_udp_do_set_buffer_size
- xs_udp_set_buffer_size
- xs_udp_timer
- xs_get_random_port
- xs_sock_set_reuseport
- xs_sock_getport
- xs_set_port
- xs_set_srcport
- xs_get_srcport
- xs_next_srcport
- xs_bind
- xs_local_rpcbind
- xs_local_set_port
- xs_reclassify_socketu
- xs_reclassify_socket4
- xs_reclassify_socket6
- xs_reclassify_socket
- xs_reclassify_socket
- xs_dummy_setup_socket
- xs_create_sock
- xs_local_finish_connecting
- xs_local_setup_socket
- xs_local_connect
- xs_set_memalloc
- xs_enable_swap
- xs_disable_swap
- xs_set_memalloc
- xs_enable_swap
- xs_disable_swap
- xs_udp_finish_connecting
- xs_udp_setup_socket
- xs_tcp_shutdown
- xs_tcp_set_socket_timeouts
- xs_tcp_set_connect_timeout
- xs_tcp_finish_connecting
- xs_tcp_setup_socket
- xs_connect
- xs_wake_disconnect
- xs_wake_write
- xs_wake_error
- xs_wake_pending
- xs_error_handle
- xs_local_print_stats
- xs_udp_print_stats
- xs_tcp_print_stats
- bc_malloc
- bc_free
- bc_sendto
- bc_send_request
- bc_close
- bc_destroy
- xs_init_anyaddr
- xs_setup_xprt
- xs_setup_local
- xs_setup_udp
- xs_setup_tcp
- xs_setup_bc_tcp
- init_socket_xprt
- cleanup_socket_xprt
- param_set_uint_minmax
- param_set_portnr
- param_set_slot_table_size
- param_set_max_slot_table_size
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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
59 static void xs_close(struct rpc_xprt *xprt);
60 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
61 struct socket *sock);
62
63
64
65
66 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
67 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
68 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
69
70 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
71 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
72
73 #define XS_TCP_LINGER_TO (15U * HZ)
74 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
75
76
77
78
79
80
81
82
83
84
85 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
86 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
87 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
88 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
89 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
90
91 static struct ctl_table_header *sunrpc_table_header;
92
93
94
95
96
97 static 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
153 static 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
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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
197 static 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
215 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
216 {
217
218 }
219 #endif
220
221 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
222 {
223 return (struct rpc_xprt *) sk->sk_user_data;
224 }
225
226 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
227 {
228 return (struct sockaddr *) &xprt->addr;
229 }
230
231 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
232 {
233 return (struct sockaddr_un *) &xprt->addr;
234 }
235
236 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
237 {
238 return (struct sockaddr_in *) &xprt->addr;
239 }
240
241 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
242 {
243 return (struct sockaddr_in6 *) &xprt->addr;
244 }
245
246 static 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
282 static 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
294 static 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
304 static 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
312 static 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
326 static size_t
327 xs_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
346 static ssize_t
347 xs_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
356 static ssize_t
357 xs_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
364 static ssize_t
365 xs_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
373 static ssize_t
374 xs_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
382 static void
383 xs_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
395 static inline void
396 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
397 {
398 }
399 #endif
400
401 static ssize_t
402 xs_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;
459 out:
460 *read = offset - seek_init;
461 return ret;
462 sock_err:
463 offset += seek;
464 goto out;
465 }
466
467 static void
468 xs_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
479 static bool
480 xs_read_stream_request_done(struct sock_xprt *transport)
481 {
482 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
483 }
484
485 static void
486 xs_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
493 static ssize_t
494 xs_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
532 static size_t
533 xs_read_stream_headersize(bool isfrag)
534 {
535 if (isfrag)
536 return sizeof(__be32);
537 return 3 * sizeof(__be32);
538 }
539
540 static ssize_t
541 xs_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)
552 static ssize_t
553 xs_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 if (transport->recv.copied && !req->rq_private_buf.len)
566 return -ESHUTDOWN;
567
568 ret = xs_read_stream_request(transport, msg, flags, req);
569 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
570 xprt_complete_bc_request(req, transport->recv.copied);
571 else
572 req->rq_private_buf.len = transport->recv.copied;
573
574 return ret;
575 }
576 #else
577 static ssize_t
578 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
579 {
580 return -ESHUTDOWN;
581 }
582 #endif
583
584 static ssize_t
585 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
586 {
587 struct rpc_xprt *xprt = &transport->xprt;
588 struct rpc_rqst *req;
589 ssize_t ret = 0;
590
591
592 spin_lock(&xprt->queue_lock);
593 req = xprt_lookup_rqst(xprt, transport->recv.xid);
594 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
595 msg->msg_flags |= MSG_TRUNC;
596 goto out;
597 }
598 xprt_pin_rqst(req);
599 spin_unlock(&xprt->queue_lock);
600
601 ret = xs_read_stream_request(transport, msg, flags, req);
602
603 spin_lock(&xprt->queue_lock);
604 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
605 xprt_complete_rqst(req->rq_task, transport->recv.copied);
606 else
607 req->rq_private_buf.len = transport->recv.copied;
608 xprt_unpin_rqst(req);
609 out:
610 spin_unlock(&xprt->queue_lock);
611 return ret;
612 }
613
614 static ssize_t
615 xs_read_stream(struct sock_xprt *transport, int flags)
616 {
617 struct msghdr msg = { 0 };
618 size_t want, read = 0;
619 ssize_t ret = 0;
620
621 if (transport->recv.len == 0) {
622 want = xs_read_stream_headersize(transport->recv.copied != 0);
623 ret = xs_read_stream_header(transport, &msg, flags, want,
624 transport->recv.offset);
625 if (ret <= 0)
626 goto out_err;
627 transport->recv.offset = ret;
628 if (transport->recv.offset != want)
629 return transport->recv.offset;
630 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
631 RPC_FRAGMENT_SIZE_MASK;
632 transport->recv.offset -= sizeof(transport->recv.fraghdr);
633 read = ret;
634 }
635
636 switch (be32_to_cpu(transport->recv.calldir)) {
637 default:
638 msg.msg_flags |= MSG_TRUNC;
639 break;
640 case RPC_CALL:
641 ret = xs_read_stream_call(transport, &msg, flags);
642 break;
643 case RPC_REPLY:
644 ret = xs_read_stream_reply(transport, &msg, flags);
645 }
646 if (msg.msg_flags & MSG_TRUNC) {
647 transport->recv.calldir = cpu_to_be32(-1);
648 transport->recv.copied = -1;
649 }
650 if (ret < 0)
651 goto out_err;
652 read += ret;
653 if (transport->recv.offset < transport->recv.len) {
654 if (!(msg.msg_flags & MSG_TRUNC))
655 return read;
656 msg.msg_flags = 0;
657 ret = xs_read_discard(transport->sock, &msg, flags,
658 transport->recv.len - transport->recv.offset);
659 if (ret <= 0)
660 goto out_err;
661 transport->recv.offset += ret;
662 read += ret;
663 if (transport->recv.offset != transport->recv.len)
664 return read;
665 }
666 if (xs_read_stream_request_done(transport)) {
667 trace_xs_stream_read_request(transport);
668 transport->recv.copied = 0;
669 }
670 transport->recv.offset = 0;
671 transport->recv.len = 0;
672 return read;
673 out_err:
674 return ret != 0 ? ret : -ESHUTDOWN;
675 }
676
677 static __poll_t xs_poll_socket(struct sock_xprt *transport)
678 {
679 return transport->sock->ops->poll(transport->file, transport->sock,
680 NULL);
681 }
682
683 static bool xs_poll_socket_readable(struct sock_xprt *transport)
684 {
685 __poll_t events = xs_poll_socket(transport);
686
687 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
688 }
689
690 static void xs_poll_check_readable(struct sock_xprt *transport)
691 {
692
693 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
694 if (!xs_poll_socket_readable(transport))
695 return;
696 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
697 queue_work(xprtiod_workqueue, &transport->recv_worker);
698 }
699
700 static void xs_stream_data_receive(struct sock_xprt *transport)
701 {
702 size_t read = 0;
703 ssize_t ret = 0;
704
705 mutex_lock(&transport->recv_mutex);
706 if (transport->sock == NULL)
707 goto out;
708 for (;;) {
709 ret = xs_read_stream(transport, MSG_DONTWAIT);
710 if (ret < 0)
711 break;
712 read += ret;
713 cond_resched();
714 }
715 if (ret == -ESHUTDOWN)
716 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
717 else
718 xs_poll_check_readable(transport);
719 out:
720 mutex_unlock(&transport->recv_mutex);
721 trace_xs_stream_read_data(&transport->xprt, ret, read);
722 }
723
724 static void xs_stream_data_receive_workfn(struct work_struct *work)
725 {
726 struct sock_xprt *transport =
727 container_of(work, struct sock_xprt, recv_worker);
728 unsigned int pflags = memalloc_nofs_save();
729
730 xs_stream_data_receive(transport);
731 memalloc_nofs_restore(pflags);
732 }
733
734 static void
735 xs_stream_reset_connect(struct sock_xprt *transport)
736 {
737 transport->recv.offset = 0;
738 transport->recv.len = 0;
739 transport->recv.copied = 0;
740 transport->xmit.offset = 0;
741 }
742
743 static void
744 xs_stream_start_connect(struct sock_xprt *transport)
745 {
746 transport->xprt.stat.connect_count++;
747 transport->xprt.stat.connect_start = jiffies;
748 }
749
750 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
751
752 static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek)
753 {
754 if (seek)
755 iov_iter_advance(&msg->msg_iter, seek);
756 return sock_sendmsg(sock, msg);
757 }
758
759 static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek)
760 {
761 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
762 return xs_sendmsg(sock, msg, seek);
763 }
764
765 static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
766 {
767 int err;
768
769 err = xdr_alloc_bvec(xdr, GFP_KERNEL);
770 if (err < 0)
771 return err;
772
773 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
774 xdr_buf_pagecount(xdr),
775 xdr->page_len + xdr->page_base);
776 return xs_sendmsg(sock, msg, base + xdr->page_base);
777 }
778
779 #define xs_record_marker_len() sizeof(rpc_fraghdr)
780
781
782
783
784
785
786 static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
787 rpc_fraghdr marker, struct kvec *vec, size_t base)
788 {
789 struct kvec iov[2] = {
790 [0] = {
791 .iov_base = &marker,
792 .iov_len = sizeof(marker)
793 },
794 [1] = *vec,
795 };
796 size_t len = iov[0].iov_len + iov[1].iov_len;
797
798 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
799 return xs_sendmsg(sock, msg, base);
800 }
801
802
803
804
805
806
807
808
809
810
811
812
813 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p)
814 {
815 struct msghdr msg = {
816 .msg_name = addr,
817 .msg_namelen = addrlen,
818 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE,
819 };
820 unsigned int rmsize = rm ? sizeof(rm) : 0;
821 unsigned int remainder = rmsize + xdr->len - base;
822 unsigned int want;
823 int err = 0;
824
825 if (unlikely(!sock))
826 return -ENOTSOCK;
827
828 want = xdr->head[0].iov_len + rmsize;
829 if (base < want) {
830 unsigned int len = want - base;
831 remainder -= len;
832 if (remainder == 0)
833 msg.msg_flags &= ~MSG_MORE;
834 if (rmsize)
835 err = xs_send_rm_and_kvec(sock, &msg, rm,
836 &xdr->head[0], base);
837 else
838 err = xs_send_kvec(sock, &msg, &xdr->head[0], base);
839 if (remainder == 0 || err != len)
840 goto out;
841 *sent_p += err;
842 base = 0;
843 } else
844 base -= want;
845
846 if (base < xdr->page_len) {
847 unsigned int len = xdr->page_len - base;
848 remainder -= len;
849 if (remainder == 0)
850 msg.msg_flags &= ~MSG_MORE;
851 err = xs_send_pagedata(sock, &msg, xdr, base);
852 if (remainder == 0 || err != len)
853 goto out;
854 *sent_p += err;
855 base = 0;
856 } else
857 base -= xdr->page_len;
858
859 if (base >= xdr->tail[0].iov_len)
860 return 0;
861 msg.msg_flags &= ~MSG_MORE;
862 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base);
863 out:
864 if (err > 0) {
865 *sent_p += err;
866 err = 0;
867 }
868 return err;
869 }
870
871
872
873
874
875
876 static int xs_nospace(struct rpc_rqst *req)
877 {
878 struct rpc_xprt *xprt = req->rq_xprt;
879 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
880 struct sock *sk = transport->inet;
881 int ret = -EAGAIN;
882
883 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
884 req->rq_task->tk_pid,
885 req->rq_slen - transport->xmit.offset,
886 req->rq_slen);
887
888
889 spin_lock(&xprt->transport_lock);
890
891
892 if (xprt_connected(xprt)) {
893
894 sk->sk_write_pending++;
895 xprt_wait_for_buffer_space(xprt);
896 } else
897 ret = -ENOTCONN;
898
899 spin_unlock(&xprt->transport_lock);
900
901
902 if (ret == -EAGAIN) {
903 struct socket_wq *wq;
904
905 rcu_read_lock();
906 wq = rcu_dereference(sk->sk_wq);
907 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
908 rcu_read_unlock();
909
910 sk->sk_write_space(sk);
911 }
912 return ret;
913 }
914
915 static void
916 xs_stream_prepare_request(struct rpc_rqst *req)
917 {
918 xdr_free_bvec(&req->rq_rcv_buf);
919 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
920 }
921
922
923
924
925
926 static bool
927 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
928 {
929 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
930 }
931
932
933
934
935 static rpc_fraghdr
936 xs_stream_record_marker(struct xdr_buf *xdr)
937 {
938 if (!xdr->len)
939 return 0;
940 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
941 }
942
943
944
945
946
947
948
949
950
951
952
953
954 static int xs_local_send_request(struct rpc_rqst *req)
955 {
956 struct rpc_xprt *xprt = req->rq_xprt;
957 struct sock_xprt *transport =
958 container_of(xprt, struct sock_xprt, xprt);
959 struct xdr_buf *xdr = &req->rq_snd_buf;
960 rpc_fraghdr rm = xs_stream_record_marker(xdr);
961 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
962 int status;
963 int sent = 0;
964
965
966 if (xs_send_request_was_aborted(transport, req)) {
967 xs_close(xprt);
968 return -ENOTCONN;
969 }
970
971 xs_pktdump("packet data:",
972 req->rq_svec->iov_base, req->rq_svec->iov_len);
973
974 req->rq_xtime = ktime_get();
975 status = xs_sendpages(transport->sock, NULL, 0, xdr,
976 transport->xmit.offset, rm, &sent);
977 dprintk("RPC: %s(%u) = %d\n",
978 __func__, xdr->len - transport->xmit.offset, status);
979
980 if (status == -EAGAIN && sock_writeable(transport->inet))
981 status = -ENOBUFS;
982
983 if (likely(sent > 0) || status == 0) {
984 transport->xmit.offset += sent;
985 req->rq_bytes_sent = transport->xmit.offset;
986 if (likely(req->rq_bytes_sent >= msglen)) {
987 req->rq_xmit_bytes_sent += transport->xmit.offset;
988 transport->xmit.offset = 0;
989 return 0;
990 }
991 status = -EAGAIN;
992 }
993
994 switch (status) {
995 case -ENOBUFS:
996 break;
997 case -EAGAIN:
998 status = xs_nospace(req);
999 break;
1000 default:
1001 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1002 -status);
1003
1004 case -EPIPE:
1005 xs_close(xprt);
1006 status = -ENOTCONN;
1007 }
1008
1009 return status;
1010 }
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023 static int xs_udp_send_request(struct rpc_rqst *req)
1024 {
1025 struct rpc_xprt *xprt = req->rq_xprt;
1026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1027 struct xdr_buf *xdr = &req->rq_snd_buf;
1028 int sent = 0;
1029 int status;
1030
1031 xs_pktdump("packet data:",
1032 req->rq_svec->iov_base,
1033 req->rq_svec->iov_len);
1034
1035 if (!xprt_bound(xprt))
1036 return -ENOTCONN;
1037
1038 if (!xprt_request_get_cong(xprt, req))
1039 return -EBADSLT;
1040
1041 req->rq_xtime = ktime_get();
1042 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
1043 xdr, 0, 0, &sent);
1044
1045 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1046 xdr->len, status);
1047
1048
1049 if (status == -EPERM)
1050 goto process_status;
1051
1052 if (status == -EAGAIN && sock_writeable(transport->inet))
1053 status = -ENOBUFS;
1054
1055 if (sent > 0 || status == 0) {
1056 req->rq_xmit_bytes_sent += sent;
1057 if (sent >= req->rq_slen)
1058 return 0;
1059
1060 status = -EAGAIN;
1061 }
1062
1063 process_status:
1064 switch (status) {
1065 case -ENOTSOCK:
1066 status = -ENOTCONN;
1067
1068 break;
1069 case -EAGAIN:
1070 status = xs_nospace(req);
1071 break;
1072 case -ENETUNREACH:
1073 case -ENOBUFS:
1074 case -EPIPE:
1075 case -ECONNREFUSED:
1076 case -EPERM:
1077
1078
1079 break;
1080 default:
1081 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1082 -status);
1083 }
1084
1085 return status;
1086 }
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102 static int xs_tcp_send_request(struct rpc_rqst *req)
1103 {
1104 struct rpc_xprt *xprt = req->rq_xprt;
1105 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1106 struct xdr_buf *xdr = &req->rq_snd_buf;
1107 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1108 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1109 bool vm_wait = false;
1110 int status;
1111 int sent;
1112
1113
1114 if (xs_send_request_was_aborted(transport, req)) {
1115 if (transport->sock != NULL)
1116 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1117 return -ENOTCONN;
1118 }
1119
1120 xs_pktdump("packet data:",
1121 req->rq_svec->iov_base,
1122 req->rq_svec->iov_len);
1123
1124 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1125 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1126
1127
1128
1129
1130 req->rq_xtime = ktime_get();
1131 while (1) {
1132 sent = 0;
1133 status = xs_sendpages(transport->sock, NULL, 0, xdr,
1134 transport->xmit.offset, rm, &sent);
1135
1136 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1137 xdr->len - transport->xmit.offset, status);
1138
1139
1140
1141 transport->xmit.offset += sent;
1142 req->rq_bytes_sent = transport->xmit.offset;
1143 if (likely(req->rq_bytes_sent >= msglen)) {
1144 req->rq_xmit_bytes_sent += transport->xmit.offset;
1145 transport->xmit.offset = 0;
1146 return 0;
1147 }
1148
1149 WARN_ON_ONCE(sent == 0 && status == 0);
1150
1151 if (status == -EAGAIN ) {
1152
1153
1154
1155
1156 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1157 break;
1158
1159
1160
1161 if (sent == 0) {
1162 status = -ENOBUFS;
1163 if (vm_wait)
1164 break;
1165
1166
1167
1168 vm_wait = true;
1169 }
1170 continue;
1171 }
1172 if (status < 0)
1173 break;
1174 vm_wait = false;
1175 }
1176
1177 switch (status) {
1178 case -ENOTSOCK:
1179 status = -ENOTCONN;
1180
1181 break;
1182 case -EAGAIN:
1183 status = xs_nospace(req);
1184 break;
1185 case -ECONNRESET:
1186 case -ECONNREFUSED:
1187 case -ENOTCONN:
1188 case -EADDRINUSE:
1189 case -ENOBUFS:
1190 case -EPIPE:
1191 break;
1192 default:
1193 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1194 -status);
1195 }
1196
1197 return status;
1198 }
1199
1200 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1201 {
1202 transport->old_data_ready = sk->sk_data_ready;
1203 transport->old_state_change = sk->sk_state_change;
1204 transport->old_write_space = sk->sk_write_space;
1205 transport->old_error_report = sk->sk_error_report;
1206 }
1207
1208 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1209 {
1210 sk->sk_data_ready = transport->old_data_ready;
1211 sk->sk_state_change = transport->old_state_change;
1212 sk->sk_write_space = transport->old_write_space;
1213 sk->sk_error_report = transport->old_error_report;
1214 }
1215
1216 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1217 {
1218 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1219
1220 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1221 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1222 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1223 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1224 }
1225
1226 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1227 {
1228 set_bit(nr, &transport->sock_state);
1229 queue_work(xprtiod_workqueue, &transport->error_worker);
1230 }
1231
1232 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1233 {
1234 smp_mb__before_atomic();
1235 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1236 clear_bit(XPRT_CLOSING, &xprt->state);
1237 xs_sock_reset_state_flags(xprt);
1238 smp_mb__after_atomic();
1239 }
1240
1241
1242
1243
1244
1245
1246
1247
1248 static void xs_error_report(struct sock *sk)
1249 {
1250 struct sock_xprt *transport;
1251 struct rpc_xprt *xprt;
1252
1253 read_lock_bh(&sk->sk_callback_lock);
1254 if (!(xprt = xprt_from_sock(sk)))
1255 goto out;
1256
1257 transport = container_of(xprt, struct sock_xprt, xprt);
1258 transport->xprt_err = -sk->sk_err;
1259 if (transport->xprt_err == 0)
1260 goto out;
1261 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1262 xprt, -transport->xprt_err);
1263 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1264
1265
1266 smp_mb__before_atomic();
1267 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1268 out:
1269 read_unlock_bh(&sk->sk_callback_lock);
1270 }
1271
1272 static void xs_reset_transport(struct sock_xprt *transport)
1273 {
1274 struct socket *sock = transport->sock;
1275 struct sock *sk = transport->inet;
1276 struct rpc_xprt *xprt = &transport->xprt;
1277 struct file *filp = transport->file;
1278
1279 if (sk == NULL)
1280 return;
1281
1282 if (atomic_read(&transport->xprt.swapper))
1283 sk_clear_memalloc(sk);
1284
1285 kernel_sock_shutdown(sock, SHUT_RDWR);
1286
1287 mutex_lock(&transport->recv_mutex);
1288 write_lock_bh(&sk->sk_callback_lock);
1289 transport->inet = NULL;
1290 transport->sock = NULL;
1291 transport->file = NULL;
1292
1293 sk->sk_user_data = NULL;
1294
1295 xs_restore_old_callbacks(transport, sk);
1296 xprt_clear_connected(xprt);
1297 write_unlock_bh(&sk->sk_callback_lock);
1298 xs_sock_reset_connection_flags(xprt);
1299
1300 xs_stream_reset_connect(transport);
1301 mutex_unlock(&transport->recv_mutex);
1302
1303 trace_rpc_socket_close(xprt, sock);
1304 fput(filp);
1305
1306 xprt_disconnect_done(xprt);
1307 }
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319 static void xs_close(struct rpc_xprt *xprt)
1320 {
1321 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1322
1323 dprintk("RPC: xs_close xprt %p\n", xprt);
1324
1325 xs_reset_transport(transport);
1326 xprt->reestablish_timeout = 0;
1327 }
1328
1329 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1330 {
1331 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1332 xprt);
1333 xprt_disconnect_done(xprt);
1334 }
1335
1336 static void xs_xprt_free(struct rpc_xprt *xprt)
1337 {
1338 xs_free_peer_addresses(xprt);
1339 xprt_free(xprt);
1340 }
1341
1342
1343
1344
1345
1346
1347 static void xs_destroy(struct rpc_xprt *xprt)
1348 {
1349 struct sock_xprt *transport = container_of(xprt,
1350 struct sock_xprt, xprt);
1351 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1352
1353 cancel_delayed_work_sync(&transport->connect_worker);
1354 xs_close(xprt);
1355 cancel_work_sync(&transport->recv_worker);
1356 cancel_work_sync(&transport->error_worker);
1357 xs_xprt_free(xprt);
1358 module_put(THIS_MODULE);
1359 }
1360
1361
1362
1363
1364
1365
1366
1367
1368 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1369 struct sock *sk,
1370 struct sk_buff *skb)
1371 {
1372 struct rpc_task *task;
1373 struct rpc_rqst *rovr;
1374 int repsize, copied;
1375 u32 _xid;
1376 __be32 *xp;
1377
1378 repsize = skb->len;
1379 if (repsize < 4) {
1380 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1381 return;
1382 }
1383
1384
1385 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1386 if (xp == NULL)
1387 return;
1388
1389
1390 spin_lock(&xprt->queue_lock);
1391 rovr = xprt_lookup_rqst(xprt, *xp);
1392 if (!rovr)
1393 goto out_unlock;
1394 xprt_pin_rqst(rovr);
1395 xprt_update_rtt(rovr->rq_task);
1396 spin_unlock(&xprt->queue_lock);
1397 task = rovr->rq_task;
1398
1399 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1400 copied = repsize;
1401
1402
1403 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1404 spin_lock(&xprt->queue_lock);
1405 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1406 goto out_unpin;
1407 }
1408
1409
1410 spin_lock(&xprt->transport_lock);
1411 xprt_adjust_cwnd(xprt, task, copied);
1412 spin_unlock(&xprt->transport_lock);
1413 spin_lock(&xprt->queue_lock);
1414 xprt_complete_rqst(task, copied);
1415 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1416 out_unpin:
1417 xprt_unpin_rqst(rovr);
1418 out_unlock:
1419 spin_unlock(&xprt->queue_lock);
1420 }
1421
1422 static void xs_udp_data_receive(struct sock_xprt *transport)
1423 {
1424 struct sk_buff *skb;
1425 struct sock *sk;
1426 int err;
1427
1428 mutex_lock(&transport->recv_mutex);
1429 sk = transport->inet;
1430 if (sk == NULL)
1431 goto out;
1432 for (;;) {
1433 skb = skb_recv_udp(sk, 0, 1, &err);
1434 if (skb == NULL)
1435 break;
1436 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1437 consume_skb(skb);
1438 cond_resched();
1439 }
1440 xs_poll_check_readable(transport);
1441 out:
1442 mutex_unlock(&transport->recv_mutex);
1443 }
1444
1445 static void xs_udp_data_receive_workfn(struct work_struct *work)
1446 {
1447 struct sock_xprt *transport =
1448 container_of(work, struct sock_xprt, recv_worker);
1449 unsigned int pflags = memalloc_nofs_save();
1450
1451 xs_udp_data_receive(transport);
1452 memalloc_nofs_restore(pflags);
1453 }
1454
1455
1456
1457
1458
1459
1460 static void xs_data_ready(struct sock *sk)
1461 {
1462 struct rpc_xprt *xprt;
1463
1464 read_lock_bh(&sk->sk_callback_lock);
1465 dprintk("RPC: xs_data_ready...\n");
1466 xprt = xprt_from_sock(sk);
1467 if (xprt != NULL) {
1468 struct sock_xprt *transport = container_of(xprt,
1469 struct sock_xprt, xprt);
1470 transport->old_data_ready(sk);
1471
1472
1473
1474 if (xprt->reestablish_timeout)
1475 xprt->reestablish_timeout = 0;
1476 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1477 queue_work(xprtiod_workqueue, &transport->recv_worker);
1478 }
1479 read_unlock_bh(&sk->sk_callback_lock);
1480 }
1481
1482
1483
1484
1485
1486 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1487 {
1488 xprt_force_disconnect(xprt);
1489 }
1490
1491 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1492 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1493 {
1494 return PAGE_SIZE;
1495 }
1496 #endif
1497
1498
1499
1500
1501
1502
1503 static void xs_tcp_state_change(struct sock *sk)
1504 {
1505 struct rpc_xprt *xprt;
1506 struct sock_xprt *transport;
1507
1508 read_lock_bh(&sk->sk_callback_lock);
1509 if (!(xprt = xprt_from_sock(sk)))
1510 goto out;
1511 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1512 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1513 sk->sk_state, xprt_connected(xprt),
1514 sock_flag(sk, SOCK_DEAD),
1515 sock_flag(sk, SOCK_ZAPPED),
1516 sk->sk_shutdown);
1517
1518 transport = container_of(xprt, struct sock_xprt, xprt);
1519 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1520 switch (sk->sk_state) {
1521 case TCP_ESTABLISHED:
1522 if (!xprt_test_and_set_connected(xprt)) {
1523 xprt->connect_cookie++;
1524 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1525 xprt_clear_connecting(xprt);
1526
1527 xprt->stat.connect_count++;
1528 xprt->stat.connect_time += (long)jiffies -
1529 xprt->stat.connect_start;
1530 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1531 }
1532 break;
1533 case TCP_FIN_WAIT1:
1534
1535 xprt->connect_cookie++;
1536 xprt->reestablish_timeout = 0;
1537 set_bit(XPRT_CLOSING, &xprt->state);
1538 smp_mb__before_atomic();
1539 clear_bit(XPRT_CONNECTED, &xprt->state);
1540 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1541 smp_mb__after_atomic();
1542 break;
1543 case TCP_CLOSE_WAIT:
1544
1545 xprt->connect_cookie++;
1546 clear_bit(XPRT_CONNECTED, &xprt->state);
1547 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1548
1549 case TCP_CLOSING:
1550
1551
1552
1553
1554 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1555 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1556 break;
1557 case TCP_LAST_ACK:
1558 set_bit(XPRT_CLOSING, &xprt->state);
1559 smp_mb__before_atomic();
1560 clear_bit(XPRT_CONNECTED, &xprt->state);
1561 smp_mb__after_atomic();
1562 break;
1563 case TCP_CLOSE:
1564 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1565 &transport->sock_state))
1566 xprt_clear_connecting(xprt);
1567 clear_bit(XPRT_CLOSING, &xprt->state);
1568
1569 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1570 }
1571 out:
1572 read_unlock_bh(&sk->sk_callback_lock);
1573 }
1574
1575 static void xs_write_space(struct sock *sk)
1576 {
1577 struct socket_wq *wq;
1578 struct sock_xprt *transport;
1579 struct rpc_xprt *xprt;
1580
1581 if (!sk->sk_socket)
1582 return;
1583 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1584
1585 if (unlikely(!(xprt = xprt_from_sock(sk))))
1586 return;
1587 transport = container_of(xprt, struct sock_xprt, xprt);
1588 rcu_read_lock();
1589 wq = rcu_dereference(sk->sk_wq);
1590 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1591 goto out;
1592
1593 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1594 sk->sk_write_pending--;
1595 out:
1596 rcu_read_unlock();
1597 }
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609 static void xs_udp_write_space(struct sock *sk)
1610 {
1611 read_lock_bh(&sk->sk_callback_lock);
1612
1613
1614 if (sock_writeable(sk))
1615 xs_write_space(sk);
1616
1617 read_unlock_bh(&sk->sk_callback_lock);
1618 }
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630 static void xs_tcp_write_space(struct sock *sk)
1631 {
1632 read_lock_bh(&sk->sk_callback_lock);
1633
1634
1635 if (sk_stream_is_writeable(sk))
1636 xs_write_space(sk);
1637
1638 read_unlock_bh(&sk->sk_callback_lock);
1639 }
1640
1641 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1642 {
1643 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1644 struct sock *sk = transport->inet;
1645
1646 if (transport->rcvsize) {
1647 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1648 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1649 }
1650 if (transport->sndsize) {
1651 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1652 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1653 sk->sk_write_space(sk);
1654 }
1655 }
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1666 {
1667 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1668
1669 transport->sndsize = 0;
1670 if (sndsize)
1671 transport->sndsize = sndsize + 1024;
1672 transport->rcvsize = 0;
1673 if (rcvsize)
1674 transport->rcvsize = rcvsize + 1024;
1675
1676 xs_udp_do_set_buffer_size(xprt);
1677 }
1678
1679
1680
1681
1682
1683
1684
1685
1686 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1687 {
1688 spin_lock(&xprt->transport_lock);
1689 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1690 spin_unlock(&xprt->transport_lock);
1691 }
1692
1693 static int xs_get_random_port(void)
1694 {
1695 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1696 unsigned short range;
1697 unsigned short rand;
1698
1699 if (max < min)
1700 return -EADDRINUSE;
1701 range = max - min + 1;
1702 rand = (unsigned short) prandom_u32() % range;
1703 return rand + min;
1704 }
1705
1706
1707
1708
1709
1710
1711
1712
1713 static void xs_sock_set_reuseport(struct socket *sock)
1714 {
1715 int opt = 1;
1716
1717 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1718 (char *)&opt, sizeof(opt));
1719 }
1720
1721 static unsigned short xs_sock_getport(struct socket *sock)
1722 {
1723 struct sockaddr_storage buf;
1724 unsigned short port = 0;
1725
1726 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1727 goto out;
1728 switch (buf.ss_family) {
1729 case AF_INET6:
1730 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1731 break;
1732 case AF_INET:
1733 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1734 }
1735 out:
1736 return port;
1737 }
1738
1739
1740
1741
1742
1743
1744
1745 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1746 {
1747 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1748
1749 rpc_set_port(xs_addr(xprt), port);
1750 xs_update_peer_port(xprt);
1751 }
1752
1753 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1754 {
1755 if (transport->srcport == 0)
1756 transport->srcport = xs_sock_getport(sock);
1757 }
1758
1759 static int xs_get_srcport(struct sock_xprt *transport)
1760 {
1761 int port = transport->srcport;
1762
1763 if (port == 0 && transport->xprt.resvport)
1764 port = xs_get_random_port();
1765 return port;
1766 }
1767
1768 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1769 {
1770 if (transport->srcport != 0)
1771 transport->srcport = 0;
1772 if (!transport->xprt.resvport)
1773 return 0;
1774 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1775 return xprt_max_resvport;
1776 return --port;
1777 }
1778 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1779 {
1780 struct sockaddr_storage myaddr;
1781 int err, nloop = 0;
1782 int port = xs_get_srcport(transport);
1783 unsigned short last;
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800 if (port <= 0)
1801 return port;
1802
1803 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1804 do {
1805 rpc_set_port((struct sockaddr *)&myaddr, port);
1806 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1807 transport->xprt.addrlen);
1808 if (err == 0) {
1809 transport->srcport = port;
1810 break;
1811 }
1812 last = port;
1813 port = xs_next_srcport(transport, port);
1814 if (port > last)
1815 nloop++;
1816 } while (err == -EADDRINUSE && nloop != 2);
1817
1818 if (myaddr.ss_family == AF_INET)
1819 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1820 &((struct sockaddr_in *)&myaddr)->sin_addr,
1821 port, err ? "failed" : "ok", err);
1822 else
1823 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1824 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1825 port, err ? "failed" : "ok", err);
1826 return err;
1827 }
1828
1829
1830
1831
1832 static void xs_local_rpcbind(struct rpc_task *task)
1833 {
1834 xprt_set_bound(task->tk_xprt);
1835 }
1836
1837 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1838 {
1839 }
1840
1841 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1842 static struct lock_class_key xs_key[2];
1843 static struct lock_class_key xs_slock_key[2];
1844
1845 static inline void xs_reclassify_socketu(struct socket *sock)
1846 {
1847 struct sock *sk = sock->sk;
1848
1849 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1850 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1851 }
1852
1853 static inline void xs_reclassify_socket4(struct socket *sock)
1854 {
1855 struct sock *sk = sock->sk;
1856
1857 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1858 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1859 }
1860
1861 static inline void xs_reclassify_socket6(struct socket *sock)
1862 {
1863 struct sock *sk = sock->sk;
1864
1865 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1866 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1867 }
1868
1869 static inline void xs_reclassify_socket(int family, struct socket *sock)
1870 {
1871 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1872 return;
1873
1874 switch (family) {
1875 case AF_LOCAL:
1876 xs_reclassify_socketu(sock);
1877 break;
1878 case AF_INET:
1879 xs_reclassify_socket4(sock);
1880 break;
1881 case AF_INET6:
1882 xs_reclassify_socket6(sock);
1883 break;
1884 }
1885 }
1886 #else
1887 static inline void xs_reclassify_socket(int family, struct socket *sock)
1888 {
1889 }
1890 #endif
1891
1892 static void xs_dummy_setup_socket(struct work_struct *work)
1893 {
1894 }
1895
1896 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1897 struct sock_xprt *transport, int family, int type,
1898 int protocol, bool reuseport)
1899 {
1900 struct file *filp;
1901 struct socket *sock;
1902 int err;
1903
1904 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1905 if (err < 0) {
1906 dprintk("RPC: can't create %d transport socket (%d).\n",
1907 protocol, -err);
1908 goto out;
1909 }
1910 xs_reclassify_socket(family, sock);
1911
1912 if (reuseport)
1913 xs_sock_set_reuseport(sock);
1914
1915 err = xs_bind(transport, sock);
1916 if (err) {
1917 sock_release(sock);
1918 goto out;
1919 }
1920
1921 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1922 if (IS_ERR(filp))
1923 return ERR_CAST(filp);
1924 transport->file = filp;
1925
1926 return sock;
1927 out:
1928 return ERR_PTR(err);
1929 }
1930
1931 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1932 struct socket *sock)
1933 {
1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1935 xprt);
1936
1937 if (!transport->inet) {
1938 struct sock *sk = sock->sk;
1939
1940 write_lock_bh(&sk->sk_callback_lock);
1941
1942 xs_save_old_callbacks(transport, sk);
1943
1944 sk->sk_user_data = xprt;
1945 sk->sk_data_ready = xs_data_ready;
1946 sk->sk_write_space = xs_udp_write_space;
1947 sock_set_flag(sk, SOCK_FASYNC);
1948 sk->sk_error_report = xs_error_report;
1949
1950 xprt_clear_connected(xprt);
1951
1952
1953 transport->sock = sock;
1954 transport->inet = sk;
1955
1956 write_unlock_bh(&sk->sk_callback_lock);
1957 }
1958
1959 xs_stream_start_connect(transport);
1960
1961 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1962 }
1963
1964
1965
1966
1967
1968 static int xs_local_setup_socket(struct sock_xprt *transport)
1969 {
1970 struct rpc_xprt *xprt = &transport->xprt;
1971 struct file *filp;
1972 struct socket *sock;
1973 int status = -EIO;
1974
1975 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1976 SOCK_STREAM, 0, &sock, 1);
1977 if (status < 0) {
1978 dprintk("RPC: can't create AF_LOCAL "
1979 "transport socket (%d).\n", -status);
1980 goto out;
1981 }
1982 xs_reclassify_socket(AF_LOCAL, sock);
1983
1984 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1985 if (IS_ERR(filp)) {
1986 status = PTR_ERR(filp);
1987 goto out;
1988 }
1989 transport->file = filp;
1990
1991 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1992 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1993
1994 status = xs_local_finish_connecting(xprt, sock);
1995 trace_rpc_socket_connect(xprt, sock, status);
1996 switch (status) {
1997 case 0:
1998 dprintk("RPC: xprt %p connected to %s\n",
1999 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2000 xprt->stat.connect_count++;
2001 xprt->stat.connect_time += (long)jiffies -
2002 xprt->stat.connect_start;
2003 xprt_set_connected(xprt);
2004 case -ENOBUFS:
2005 break;
2006 case -ENOENT:
2007 dprintk("RPC: xprt %p: socket %s does not exist\n",
2008 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2009 break;
2010 case -ECONNREFUSED:
2011 dprintk("RPC: xprt %p: connection refused for %s\n",
2012 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2013 break;
2014 default:
2015 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2016 __func__, -status,
2017 xprt->address_strings[RPC_DISPLAY_ADDR]);
2018 }
2019
2020 out:
2021 xprt_clear_connecting(xprt);
2022 xprt_wake_pending_tasks(xprt, status);
2023 return status;
2024 }
2025
2026 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2027 {
2028 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2029 int ret;
2030
2031 if (RPC_IS_ASYNC(task)) {
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041 task->tk_rpc_status = -ENOTCONN;
2042 rpc_exit(task, -ENOTCONN);
2043 return;
2044 }
2045 ret = xs_local_setup_socket(transport);
2046 if (ret && !RPC_IS_SOFTCONN(task))
2047 msleep_interruptible(15000);
2048 }
2049
2050 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2051
2052
2053
2054
2055
2056 static void xs_set_memalloc(struct rpc_xprt *xprt)
2057 {
2058 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2059 xprt);
2060
2061
2062
2063
2064
2065 if (!transport->inet)
2066 return;
2067 if (atomic_read(&xprt->swapper))
2068 sk_set_memalloc(transport->inet);
2069 }
2070
2071
2072
2073
2074
2075
2076
2077
2078 static int
2079 xs_enable_swap(struct rpc_xprt *xprt)
2080 {
2081 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2082
2083 if (atomic_inc_return(&xprt->swapper) != 1)
2084 return 0;
2085 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2086 return -ERESTARTSYS;
2087 if (xs->inet)
2088 sk_set_memalloc(xs->inet);
2089 xprt_release_xprt(xprt, NULL);
2090 return 0;
2091 }
2092
2093
2094
2095
2096
2097
2098
2099
2100 static void
2101 xs_disable_swap(struct rpc_xprt *xprt)
2102 {
2103 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2104
2105 if (!atomic_dec_and_test(&xprt->swapper))
2106 return;
2107 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2108 return;
2109 if (xs->inet)
2110 sk_clear_memalloc(xs->inet);
2111 xprt_release_xprt(xprt, NULL);
2112 }
2113 #else
2114 static void xs_set_memalloc(struct rpc_xprt *xprt)
2115 {
2116 }
2117
2118 static int
2119 xs_enable_swap(struct rpc_xprt *xprt)
2120 {
2121 return -EINVAL;
2122 }
2123
2124 static void
2125 xs_disable_swap(struct rpc_xprt *xprt)
2126 {
2127 }
2128 #endif
2129
2130 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2131 {
2132 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2133
2134 if (!transport->inet) {
2135 struct sock *sk = sock->sk;
2136
2137 write_lock_bh(&sk->sk_callback_lock);
2138
2139 xs_save_old_callbacks(transport, sk);
2140
2141 sk->sk_user_data = xprt;
2142 sk->sk_data_ready = xs_data_ready;
2143 sk->sk_write_space = xs_udp_write_space;
2144 sock_set_flag(sk, SOCK_FASYNC);
2145
2146 xprt_set_connected(xprt);
2147
2148
2149 transport->sock = sock;
2150 transport->inet = sk;
2151
2152 xs_set_memalloc(xprt);
2153
2154 write_unlock_bh(&sk->sk_callback_lock);
2155 }
2156 xs_udp_do_set_buffer_size(xprt);
2157
2158 xprt->stat.connect_start = jiffies;
2159 }
2160
2161 static void xs_udp_setup_socket(struct work_struct *work)
2162 {
2163 struct sock_xprt *transport =
2164 container_of(work, struct sock_xprt, connect_worker.work);
2165 struct rpc_xprt *xprt = &transport->xprt;
2166 struct socket *sock;
2167 int status = -EIO;
2168
2169 sock = xs_create_sock(xprt, transport,
2170 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2171 IPPROTO_UDP, false);
2172 if (IS_ERR(sock))
2173 goto out;
2174
2175 dprintk("RPC: worker connecting xprt %p via %s to "
2176 "%s (port %s)\n", xprt,
2177 xprt->address_strings[RPC_DISPLAY_PROTO],
2178 xprt->address_strings[RPC_DISPLAY_ADDR],
2179 xprt->address_strings[RPC_DISPLAY_PORT]);
2180
2181 xs_udp_finish_connecting(xprt, sock);
2182 trace_rpc_socket_connect(xprt, sock, 0);
2183 status = 0;
2184 out:
2185 xprt_clear_connecting(xprt);
2186 xprt_unlock_connect(xprt, transport);
2187 xprt_wake_pending_tasks(xprt, status);
2188 }
2189
2190
2191
2192
2193
2194
2195
2196
2197 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2198 {
2199 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2200 struct socket *sock = transport->sock;
2201 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2202
2203 if (sock == NULL)
2204 return;
2205 switch (skst) {
2206 default:
2207 kernel_sock_shutdown(sock, SHUT_RDWR);
2208 trace_rpc_socket_shutdown(xprt, sock);
2209 break;
2210 case TCP_CLOSE:
2211 case TCP_TIME_WAIT:
2212 xs_reset_transport(transport);
2213 }
2214 }
2215
2216 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2217 struct socket *sock)
2218 {
2219 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2220 unsigned int keepidle;
2221 unsigned int keepcnt;
2222 unsigned int opt_on = 1;
2223 unsigned int timeo;
2224
2225 spin_lock(&xprt->transport_lock);
2226 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2227 keepcnt = xprt->timeout->to_retries + 1;
2228 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2229 (xprt->timeout->to_retries + 1);
2230 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2231 spin_unlock(&xprt->transport_lock);
2232
2233
2234 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2235 (char *)&opt_on, sizeof(opt_on));
2236 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2237 (char *)&keepidle, sizeof(keepidle));
2238 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2239 (char *)&keepidle, sizeof(keepidle));
2240 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2241 (char *)&keepcnt, sizeof(keepcnt));
2242
2243
2244 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2245 (char *)&timeo, sizeof(timeo));
2246 }
2247
2248 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2249 unsigned long connect_timeout,
2250 unsigned long reconnect_timeout)
2251 {
2252 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2253 struct rpc_timeout to;
2254 unsigned long initval;
2255
2256 spin_lock(&xprt->transport_lock);
2257 if (reconnect_timeout < xprt->max_reconnect_timeout)
2258 xprt->max_reconnect_timeout = reconnect_timeout;
2259 if (connect_timeout < xprt->connect_timeout) {
2260 memcpy(&to, xprt->timeout, sizeof(to));
2261 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2262
2263 if (initval < XS_TCP_INIT_REEST_TO << 1)
2264 initval = XS_TCP_INIT_REEST_TO << 1;
2265 to.to_initval = initval;
2266 to.to_maxval = initval;
2267 memcpy(&transport->tcp_timeout, &to,
2268 sizeof(transport->tcp_timeout));
2269 xprt->timeout = &transport->tcp_timeout;
2270 xprt->connect_timeout = connect_timeout;
2271 }
2272 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2273 spin_unlock(&xprt->transport_lock);
2274 }
2275
2276 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2277 {
2278 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2279 int ret = -ENOTCONN;
2280
2281 if (!transport->inet) {
2282 struct sock *sk = sock->sk;
2283 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2284
2285
2286
2287
2288
2289
2290
2291
2292 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2293 (char *)&addr_pref, sizeof(addr_pref));
2294
2295 xs_tcp_set_socket_timeouts(xprt, sock);
2296
2297 write_lock_bh(&sk->sk_callback_lock);
2298
2299 xs_save_old_callbacks(transport, sk);
2300
2301 sk->sk_user_data = xprt;
2302 sk->sk_data_ready = xs_data_ready;
2303 sk->sk_state_change = xs_tcp_state_change;
2304 sk->sk_write_space = xs_tcp_write_space;
2305 sock_set_flag(sk, SOCK_FASYNC);
2306 sk->sk_error_report = xs_error_report;
2307
2308
2309 sock_reset_flag(sk, SOCK_LINGER);
2310 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2311
2312 xprt_clear_connected(xprt);
2313
2314
2315 transport->sock = sock;
2316 transport->inet = sk;
2317
2318 write_unlock_bh(&sk->sk_callback_lock);
2319 }
2320
2321 if (!xprt_bound(xprt))
2322 goto out;
2323
2324 xs_set_memalloc(xprt);
2325
2326 xs_stream_start_connect(transport);
2327
2328
2329 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2330 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2331 switch (ret) {
2332 case 0:
2333 xs_set_srcport(transport, sock);
2334
2335 case -EINPROGRESS:
2336
2337 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2338 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2339 break;
2340 case -EADDRNOTAVAIL:
2341
2342 transport->srcport = 0;
2343 }
2344 out:
2345 return ret;
2346 }
2347
2348
2349
2350
2351
2352
2353
2354 static void xs_tcp_setup_socket(struct work_struct *work)
2355 {
2356 struct sock_xprt *transport =
2357 container_of(work, struct sock_xprt, connect_worker.work);
2358 struct socket *sock = transport->sock;
2359 struct rpc_xprt *xprt = &transport->xprt;
2360 int status = -EIO;
2361
2362 if (!sock) {
2363 sock = xs_create_sock(xprt, transport,
2364 xs_addr(xprt)->sa_family, SOCK_STREAM,
2365 IPPROTO_TCP, true);
2366 if (IS_ERR(sock)) {
2367 status = PTR_ERR(sock);
2368 goto out;
2369 }
2370 }
2371
2372 dprintk("RPC: worker connecting xprt %p via %s to "
2373 "%s (port %s)\n", xprt,
2374 xprt->address_strings[RPC_DISPLAY_PROTO],
2375 xprt->address_strings[RPC_DISPLAY_ADDR],
2376 xprt->address_strings[RPC_DISPLAY_PORT]);
2377
2378 status = xs_tcp_finish_connecting(xprt, sock);
2379 trace_rpc_socket_connect(xprt, sock, status);
2380 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2381 xprt, -status, xprt_connected(xprt),
2382 sock->sk->sk_state);
2383 switch (status) {
2384 default:
2385 printk("%s: connect returned unhandled error %d\n",
2386 __func__, status);
2387
2388 case -EADDRNOTAVAIL:
2389
2390
2391
2392 xs_tcp_force_close(xprt);
2393 break;
2394 case 0:
2395 case -EINPROGRESS:
2396 case -EALREADY:
2397 xprt_unlock_connect(xprt, transport);
2398 return;
2399 case -EINVAL:
2400
2401
2402
2403 case -ECONNREFUSED:
2404 case -ECONNRESET:
2405 case -ENETDOWN:
2406 case -ENETUNREACH:
2407 case -EHOSTUNREACH:
2408 case -EADDRINUSE:
2409 case -ENOBUFS:
2410
2411
2412
2413
2414
2415 xprt_wake_pending_tasks(xprt, status);
2416 xs_tcp_force_close(xprt);
2417 goto out;
2418 }
2419 status = -EAGAIN;
2420 out:
2421 xprt_clear_connecting(xprt);
2422 xprt_unlock_connect(xprt, transport);
2423 xprt_wake_pending_tasks(xprt, status);
2424 }
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2441 {
2442 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2443 unsigned long delay = 0;
2444
2445 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2446
2447 if (transport->sock != NULL) {
2448 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2449 "seconds\n",
2450 xprt, xprt->reestablish_timeout / HZ);
2451
2452
2453 xs_reset_transport(transport);
2454
2455 delay = xprt_reconnect_delay(xprt);
2456 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2457
2458 } else
2459 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2460
2461 queue_delayed_work(xprtiod_workqueue,
2462 &transport->connect_worker,
2463 delay);
2464 }
2465
2466 static void xs_wake_disconnect(struct sock_xprt *transport)
2467 {
2468 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2469 xs_tcp_force_close(&transport->xprt);
2470 }
2471
2472 static void xs_wake_write(struct sock_xprt *transport)
2473 {
2474 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2475 xprt_write_space(&transport->xprt);
2476 }
2477
2478 static void xs_wake_error(struct sock_xprt *transport)
2479 {
2480 int sockerr;
2481
2482 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2483 return;
2484 mutex_lock(&transport->recv_mutex);
2485 if (transport->sock == NULL)
2486 goto out;
2487 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2488 goto out;
2489 sockerr = xchg(&transport->xprt_err, 0);
2490 if (sockerr < 0)
2491 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2492 out:
2493 mutex_unlock(&transport->recv_mutex);
2494 }
2495
2496 static void xs_wake_pending(struct sock_xprt *transport)
2497 {
2498 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2499 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2500 }
2501
2502 static void xs_error_handle(struct work_struct *work)
2503 {
2504 struct sock_xprt *transport = container_of(work,
2505 struct sock_xprt, error_worker);
2506
2507 xs_wake_disconnect(transport);
2508 xs_wake_write(transport);
2509 xs_wake_error(transport);
2510 xs_wake_pending(transport);
2511 }
2512
2513
2514
2515
2516
2517
2518
2519 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2520 {
2521 long idle_time = 0;
2522
2523 if (xprt_connected(xprt))
2524 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2525
2526 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2527 "%llu %llu %lu %llu %llu\n",
2528 xprt->stat.bind_count,
2529 xprt->stat.connect_count,
2530 xprt->stat.connect_time / HZ,
2531 idle_time,
2532 xprt->stat.sends,
2533 xprt->stat.recvs,
2534 xprt->stat.bad_xids,
2535 xprt->stat.req_u,
2536 xprt->stat.bklog_u,
2537 xprt->stat.max_slots,
2538 xprt->stat.sending_u,
2539 xprt->stat.pending_u);
2540 }
2541
2542
2543
2544
2545
2546
2547
2548 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2549 {
2550 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2551
2552 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2553 "%lu %llu %llu\n",
2554 transport->srcport,
2555 xprt->stat.bind_count,
2556 xprt->stat.sends,
2557 xprt->stat.recvs,
2558 xprt->stat.bad_xids,
2559 xprt->stat.req_u,
2560 xprt->stat.bklog_u,
2561 xprt->stat.max_slots,
2562 xprt->stat.sending_u,
2563 xprt->stat.pending_u);
2564 }
2565
2566
2567
2568
2569
2570
2571
2572 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2573 {
2574 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2575 long idle_time = 0;
2576
2577 if (xprt_connected(xprt))
2578 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2579
2580 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2581 "%llu %llu %lu %llu %llu\n",
2582 transport->srcport,
2583 xprt->stat.bind_count,
2584 xprt->stat.connect_count,
2585 xprt->stat.connect_time / HZ,
2586 idle_time,
2587 xprt->stat.sends,
2588 xprt->stat.recvs,
2589 xprt->stat.bad_xids,
2590 xprt->stat.req_u,
2591 xprt->stat.bklog_u,
2592 xprt->stat.max_slots,
2593 xprt->stat.sending_u,
2594 xprt->stat.pending_u);
2595 }
2596
2597
2598
2599
2600
2601
2602 static int bc_malloc(struct rpc_task *task)
2603 {
2604 struct rpc_rqst *rqst = task->tk_rqstp;
2605 size_t size = rqst->rq_callsize;
2606 struct page *page;
2607 struct rpc_buffer *buf;
2608
2609 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2610 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2611 size);
2612 return -EINVAL;
2613 }
2614
2615 page = alloc_page(GFP_KERNEL);
2616 if (!page)
2617 return -ENOMEM;
2618
2619 buf = page_address(page);
2620 buf->len = PAGE_SIZE;
2621
2622 rqst->rq_buffer = buf->data;
2623 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2624 return 0;
2625 }
2626
2627
2628
2629
2630 static void bc_free(struct rpc_task *task)
2631 {
2632 void *buffer = task->tk_rqstp->rq_buffer;
2633 struct rpc_buffer *buf;
2634
2635 buf = container_of(buffer, struct rpc_buffer, data);
2636 free_page((unsigned long)buf);
2637 }
2638
2639
2640
2641
2642
2643 static int bc_sendto(struct rpc_rqst *req)
2644 {
2645 int len;
2646 struct xdr_buf *xbufp = &req->rq_snd_buf;
2647 struct sock_xprt *transport =
2648 container_of(req->rq_xprt, struct sock_xprt, xprt);
2649 unsigned long headoff;
2650 unsigned long tailoff;
2651 struct page *tailpage;
2652 struct msghdr msg = {
2653 .msg_flags = MSG_MORE
2654 };
2655 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2656 (u32)xbufp->len);
2657 struct kvec iov = {
2658 .iov_base = &marker,
2659 .iov_len = sizeof(marker),
2660 };
2661
2662 req->rq_xtime = ktime_get();
2663
2664 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len);
2665 if (len != iov.iov_len)
2666 return -EAGAIN;
2667
2668 tailpage = NULL;
2669 if (xbufp->tail[0].iov_len)
2670 tailpage = virt_to_page(xbufp->tail[0].iov_base);
2671 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2672 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2673 len = svc_send_common(transport->sock, xbufp,
2674 virt_to_page(xbufp->head[0].iov_base), headoff,
2675 tailpage, tailoff);
2676 if (len != xbufp->len)
2677 return -EAGAIN;
2678 return len;
2679 }
2680
2681
2682
2683
2684 static int bc_send_request(struct rpc_rqst *req)
2685 {
2686 struct svc_xprt *xprt;
2687 int len;
2688
2689
2690
2691
2692 xprt = req->rq_xprt->bc_xprt;
2693
2694
2695
2696
2697
2698 mutex_lock(&xprt->xpt_mutex);
2699 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2700 len = -ENOTCONN;
2701 else
2702 len = bc_sendto(req);
2703 mutex_unlock(&xprt->xpt_mutex);
2704
2705 if (len > 0)
2706 len = 0;
2707
2708 return len;
2709 }
2710
2711
2712
2713
2714
2715 static void bc_close(struct rpc_xprt *xprt)
2716 {
2717 xprt_disconnect_done(xprt);
2718 }
2719
2720
2721
2722
2723
2724
2725 static void bc_destroy(struct rpc_xprt *xprt)
2726 {
2727 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2728
2729 xs_xprt_free(xprt);
2730 module_put(THIS_MODULE);
2731 }
2732
2733 static const struct rpc_xprt_ops xs_local_ops = {
2734 .reserve_xprt = xprt_reserve_xprt,
2735 .release_xprt = xprt_release_xprt,
2736 .alloc_slot = xprt_alloc_slot,
2737 .free_slot = xprt_free_slot,
2738 .rpcbind = xs_local_rpcbind,
2739 .set_port = xs_local_set_port,
2740 .connect = xs_local_connect,
2741 .buf_alloc = rpc_malloc,
2742 .buf_free = rpc_free,
2743 .prepare_request = xs_stream_prepare_request,
2744 .send_request = xs_local_send_request,
2745 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2746 .close = xs_close,
2747 .destroy = xs_destroy,
2748 .print_stats = xs_local_print_stats,
2749 .enable_swap = xs_enable_swap,
2750 .disable_swap = xs_disable_swap,
2751 };
2752
2753 static const struct rpc_xprt_ops xs_udp_ops = {
2754 .set_buffer_size = xs_udp_set_buffer_size,
2755 .reserve_xprt = xprt_reserve_xprt_cong,
2756 .release_xprt = xprt_release_xprt_cong,
2757 .alloc_slot = xprt_alloc_slot,
2758 .free_slot = xprt_free_slot,
2759 .rpcbind = rpcb_getport_async,
2760 .set_port = xs_set_port,
2761 .connect = xs_connect,
2762 .buf_alloc = rpc_malloc,
2763 .buf_free = rpc_free,
2764 .send_request = xs_udp_send_request,
2765 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2766 .timer = xs_udp_timer,
2767 .release_request = xprt_release_rqst_cong,
2768 .close = xs_close,
2769 .destroy = xs_destroy,
2770 .print_stats = xs_udp_print_stats,
2771 .enable_swap = xs_enable_swap,
2772 .disable_swap = xs_disable_swap,
2773 .inject_disconnect = xs_inject_disconnect,
2774 };
2775
2776 static const struct rpc_xprt_ops xs_tcp_ops = {
2777 .reserve_xprt = xprt_reserve_xprt,
2778 .release_xprt = xprt_release_xprt,
2779 .alloc_slot = xprt_alloc_slot,
2780 .free_slot = xprt_free_slot,
2781 .rpcbind = rpcb_getport_async,
2782 .set_port = xs_set_port,
2783 .connect = xs_connect,
2784 .buf_alloc = rpc_malloc,
2785 .buf_free = rpc_free,
2786 .prepare_request = xs_stream_prepare_request,
2787 .send_request = xs_tcp_send_request,
2788 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2789 .close = xs_tcp_shutdown,
2790 .destroy = xs_destroy,
2791 .set_connect_timeout = xs_tcp_set_connect_timeout,
2792 .print_stats = xs_tcp_print_stats,
2793 .enable_swap = xs_enable_swap,
2794 .disable_swap = xs_disable_swap,
2795 .inject_disconnect = xs_inject_disconnect,
2796 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2797 .bc_setup = xprt_setup_bc,
2798 .bc_maxpayload = xs_tcp_bc_maxpayload,
2799 .bc_num_slots = xprt_bc_max_slots,
2800 .bc_free_rqst = xprt_free_bc_rqst,
2801 .bc_destroy = xprt_destroy_bc,
2802 #endif
2803 };
2804
2805
2806
2807
2808
2809 static const struct rpc_xprt_ops bc_tcp_ops = {
2810 .reserve_xprt = xprt_reserve_xprt,
2811 .release_xprt = xprt_release_xprt,
2812 .alloc_slot = xprt_alloc_slot,
2813 .free_slot = xprt_free_slot,
2814 .buf_alloc = bc_malloc,
2815 .buf_free = bc_free,
2816 .send_request = bc_send_request,
2817 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2818 .close = bc_close,
2819 .destroy = bc_destroy,
2820 .print_stats = xs_tcp_print_stats,
2821 .enable_swap = xs_enable_swap,
2822 .disable_swap = xs_disable_swap,
2823 .inject_disconnect = xs_inject_disconnect,
2824 };
2825
2826 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2827 {
2828 static const struct sockaddr_in sin = {
2829 .sin_family = AF_INET,
2830 .sin_addr.s_addr = htonl(INADDR_ANY),
2831 };
2832 static const struct sockaddr_in6 sin6 = {
2833 .sin6_family = AF_INET6,
2834 .sin6_addr = IN6ADDR_ANY_INIT,
2835 };
2836
2837 switch (family) {
2838 case AF_LOCAL:
2839 break;
2840 case AF_INET:
2841 memcpy(sap, &sin, sizeof(sin));
2842 break;
2843 case AF_INET6:
2844 memcpy(sap, &sin6, sizeof(sin6));
2845 break;
2846 default:
2847 dprintk("RPC: %s: Bad address family\n", __func__);
2848 return -EAFNOSUPPORT;
2849 }
2850 return 0;
2851 }
2852
2853 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2854 unsigned int slot_table_size,
2855 unsigned int max_slot_table_size)
2856 {
2857 struct rpc_xprt *xprt;
2858 struct sock_xprt *new;
2859
2860 if (args->addrlen > sizeof(xprt->addr)) {
2861 dprintk("RPC: xs_setup_xprt: address too large\n");
2862 return ERR_PTR(-EBADF);
2863 }
2864
2865 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2866 max_slot_table_size);
2867 if (xprt == NULL) {
2868 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2869 "rpc_xprt\n");
2870 return ERR_PTR(-ENOMEM);
2871 }
2872
2873 new = container_of(xprt, struct sock_xprt, xprt);
2874 mutex_init(&new->recv_mutex);
2875 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2876 xprt->addrlen = args->addrlen;
2877 if (args->srcaddr)
2878 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2879 else {
2880 int err;
2881 err = xs_init_anyaddr(args->dstaddr->sa_family,
2882 (struct sockaddr *)&new->srcaddr);
2883 if (err != 0) {
2884 xprt_free(xprt);
2885 return ERR_PTR(err);
2886 }
2887 }
2888
2889 return xprt;
2890 }
2891
2892 static const struct rpc_timeout xs_local_default_timeout = {
2893 .to_initval = 10 * HZ,
2894 .to_maxval = 10 * HZ,
2895 .to_retries = 2,
2896 };
2897
2898
2899
2900
2901
2902
2903
2904 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2905 {
2906 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2907 struct sock_xprt *transport;
2908 struct rpc_xprt *xprt;
2909 struct rpc_xprt *ret;
2910
2911 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2912 xprt_max_tcp_slot_table_entries);
2913 if (IS_ERR(xprt))
2914 return xprt;
2915 transport = container_of(xprt, struct sock_xprt, xprt);
2916
2917 xprt->prot = 0;
2918 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2919
2920 xprt->bind_timeout = XS_BIND_TO;
2921 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2922 xprt->idle_timeout = XS_IDLE_DISC_TO;
2923
2924 xprt->ops = &xs_local_ops;
2925 xprt->timeout = &xs_local_default_timeout;
2926
2927 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2928 INIT_WORK(&transport->error_worker, xs_error_handle);
2929 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2930
2931 switch (sun->sun_family) {
2932 case AF_LOCAL:
2933 if (sun->sun_path[0] != '/') {
2934 dprintk("RPC: bad AF_LOCAL address: %s\n",
2935 sun->sun_path);
2936 ret = ERR_PTR(-EINVAL);
2937 goto out_err;
2938 }
2939 xprt_set_bound(xprt);
2940 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2941 ret = ERR_PTR(xs_local_setup_socket(transport));
2942 if (ret)
2943 goto out_err;
2944 break;
2945 default:
2946 ret = ERR_PTR(-EAFNOSUPPORT);
2947 goto out_err;
2948 }
2949
2950 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2951 xprt->address_strings[RPC_DISPLAY_ADDR]);
2952
2953 if (try_module_get(THIS_MODULE))
2954 return xprt;
2955 ret = ERR_PTR(-EINVAL);
2956 out_err:
2957 xs_xprt_free(xprt);
2958 return ret;
2959 }
2960
2961 static const struct rpc_timeout xs_udp_default_timeout = {
2962 .to_initval = 5 * HZ,
2963 .to_maxval = 30 * HZ,
2964 .to_increment = 5 * HZ,
2965 .to_retries = 5,
2966 };
2967
2968
2969
2970
2971
2972
2973 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2974 {
2975 struct sockaddr *addr = args->dstaddr;
2976 struct rpc_xprt *xprt;
2977 struct sock_xprt *transport;
2978 struct rpc_xprt *ret;
2979
2980 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2981 xprt_udp_slot_table_entries);
2982 if (IS_ERR(xprt))
2983 return xprt;
2984 transport = container_of(xprt, struct sock_xprt, xprt);
2985
2986 xprt->prot = IPPROTO_UDP;
2987
2988 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2989
2990 xprt->bind_timeout = XS_BIND_TO;
2991 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2992 xprt->idle_timeout = XS_IDLE_DISC_TO;
2993
2994 xprt->ops = &xs_udp_ops;
2995
2996 xprt->timeout = &xs_udp_default_timeout;
2997
2998 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2999 INIT_WORK(&transport->error_worker, xs_error_handle);
3000 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3001
3002 switch (addr->sa_family) {
3003 case AF_INET:
3004 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3005 xprt_set_bound(xprt);
3006
3007 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3008 break;
3009 case AF_INET6:
3010 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3011 xprt_set_bound(xprt);
3012
3013 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3014 break;
3015 default:
3016 ret = ERR_PTR(-EAFNOSUPPORT);
3017 goto out_err;
3018 }
3019
3020 if (xprt_bound(xprt))
3021 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3022 xprt->address_strings[RPC_DISPLAY_ADDR],
3023 xprt->address_strings[RPC_DISPLAY_PORT],
3024 xprt->address_strings[RPC_DISPLAY_PROTO]);
3025 else
3026 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3027 xprt->address_strings[RPC_DISPLAY_ADDR],
3028 xprt->address_strings[RPC_DISPLAY_PROTO]);
3029
3030 if (try_module_get(THIS_MODULE))
3031 return xprt;
3032 ret = ERR_PTR(-EINVAL);
3033 out_err:
3034 xs_xprt_free(xprt);
3035 return ret;
3036 }
3037
3038 static const struct rpc_timeout xs_tcp_default_timeout = {
3039 .to_initval = 60 * HZ,
3040 .to_maxval = 60 * HZ,
3041 .to_retries = 2,
3042 };
3043
3044
3045
3046
3047
3048
3049 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3050 {
3051 struct sockaddr *addr = args->dstaddr;
3052 struct rpc_xprt *xprt;
3053 struct sock_xprt *transport;
3054 struct rpc_xprt *ret;
3055 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3056
3057 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3058 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3059
3060 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3061 max_slot_table_size);
3062 if (IS_ERR(xprt))
3063 return xprt;
3064 transport = container_of(xprt, struct sock_xprt, xprt);
3065
3066 xprt->prot = IPPROTO_TCP;
3067 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3068
3069 xprt->bind_timeout = XS_BIND_TO;
3070 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3071 xprt->idle_timeout = XS_IDLE_DISC_TO;
3072
3073 xprt->ops = &xs_tcp_ops;
3074 xprt->timeout = &xs_tcp_default_timeout;
3075
3076 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3077 xprt->connect_timeout = xprt->timeout->to_initval *
3078 (xprt->timeout->to_retries + 1);
3079
3080 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3081 INIT_WORK(&transport->error_worker, xs_error_handle);
3082 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3083
3084 switch (addr->sa_family) {
3085 case AF_INET:
3086 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3087 xprt_set_bound(xprt);
3088
3089 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3090 break;
3091 case AF_INET6:
3092 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3093 xprt_set_bound(xprt);
3094
3095 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3096 break;
3097 default:
3098 ret = ERR_PTR(-EAFNOSUPPORT);
3099 goto out_err;
3100 }
3101
3102 if (xprt_bound(xprt))
3103 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3104 xprt->address_strings[RPC_DISPLAY_ADDR],
3105 xprt->address_strings[RPC_DISPLAY_PORT],
3106 xprt->address_strings[RPC_DISPLAY_PROTO]);
3107 else
3108 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3109 xprt->address_strings[RPC_DISPLAY_ADDR],
3110 xprt->address_strings[RPC_DISPLAY_PROTO]);
3111
3112 if (try_module_get(THIS_MODULE))
3113 return xprt;
3114 ret = ERR_PTR(-EINVAL);
3115 out_err:
3116 xs_xprt_free(xprt);
3117 return ret;
3118 }
3119
3120
3121
3122
3123
3124
3125 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3126 {
3127 struct sockaddr *addr = args->dstaddr;
3128 struct rpc_xprt *xprt;
3129 struct sock_xprt *transport;
3130 struct svc_sock *bc_sock;
3131 struct rpc_xprt *ret;
3132
3133 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3134 xprt_tcp_slot_table_entries);
3135 if (IS_ERR(xprt))
3136 return xprt;
3137 transport = container_of(xprt, struct sock_xprt, xprt);
3138
3139 xprt->prot = IPPROTO_TCP;
3140 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3141 xprt->timeout = &xs_tcp_default_timeout;
3142
3143
3144 xprt_set_bound(xprt);
3145 xprt->bind_timeout = 0;
3146 xprt->reestablish_timeout = 0;
3147 xprt->idle_timeout = 0;
3148
3149 xprt->ops = &bc_tcp_ops;
3150
3151 switch (addr->sa_family) {
3152 case AF_INET:
3153 xs_format_peer_addresses(xprt, "tcp",
3154 RPCBIND_NETID_TCP);
3155 break;
3156 case AF_INET6:
3157 xs_format_peer_addresses(xprt, "tcp",
3158 RPCBIND_NETID_TCP6);
3159 break;
3160 default:
3161 ret = ERR_PTR(-EAFNOSUPPORT);
3162 goto out_err;
3163 }
3164
3165 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3166 xprt->address_strings[RPC_DISPLAY_ADDR],
3167 xprt->address_strings[RPC_DISPLAY_PORT],
3168 xprt->address_strings[RPC_DISPLAY_PROTO]);
3169
3170
3171
3172
3173
3174
3175
3176 xprt_get(xprt);
3177 args->bc_xprt->xpt_bc_xprt = xprt;
3178 xprt->bc_xprt = args->bc_xprt;
3179 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3180 transport->sock = bc_sock->sk_sock;
3181 transport->inet = bc_sock->sk_sk;
3182
3183
3184
3185
3186
3187 xprt_set_connected(xprt);
3188
3189 if (try_module_get(THIS_MODULE))
3190 return xprt;
3191
3192 args->bc_xprt->xpt_bc_xprt = NULL;
3193 args->bc_xprt->xpt_bc_xps = NULL;
3194 xprt_put(xprt);
3195 ret = ERR_PTR(-EINVAL);
3196 out_err:
3197 xs_xprt_free(xprt);
3198 return ret;
3199 }
3200
3201 static struct xprt_class xs_local_transport = {
3202 .list = LIST_HEAD_INIT(xs_local_transport.list),
3203 .name = "named UNIX socket",
3204 .owner = THIS_MODULE,
3205 .ident = XPRT_TRANSPORT_LOCAL,
3206 .setup = xs_setup_local,
3207 };
3208
3209 static struct xprt_class xs_udp_transport = {
3210 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3211 .name = "udp",
3212 .owner = THIS_MODULE,
3213 .ident = XPRT_TRANSPORT_UDP,
3214 .setup = xs_setup_udp,
3215 };
3216
3217 static struct xprt_class xs_tcp_transport = {
3218 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3219 .name = "tcp",
3220 .owner = THIS_MODULE,
3221 .ident = XPRT_TRANSPORT_TCP,
3222 .setup = xs_setup_tcp,
3223 };
3224
3225 static struct xprt_class xs_bc_tcp_transport = {
3226 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3227 .name = "tcp NFSv4.1 backchannel",
3228 .owner = THIS_MODULE,
3229 .ident = XPRT_TRANSPORT_BC_TCP,
3230 .setup = xs_setup_bc_tcp,
3231 };
3232
3233
3234
3235
3236
3237 int init_socket_xprt(void)
3238 {
3239 if (!sunrpc_table_header)
3240 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3241
3242 xprt_register_transport(&xs_local_transport);
3243 xprt_register_transport(&xs_udp_transport);
3244 xprt_register_transport(&xs_tcp_transport);
3245 xprt_register_transport(&xs_bc_tcp_transport);
3246
3247 return 0;
3248 }
3249
3250
3251
3252
3253
3254 void cleanup_socket_xprt(void)
3255 {
3256 if (sunrpc_table_header) {
3257 unregister_sysctl_table(sunrpc_table_header);
3258 sunrpc_table_header = NULL;
3259 }
3260
3261 xprt_unregister_transport(&xs_local_transport);
3262 xprt_unregister_transport(&xs_udp_transport);
3263 xprt_unregister_transport(&xs_tcp_transport);
3264 xprt_unregister_transport(&xs_bc_tcp_transport);
3265 }
3266
3267 static int param_set_uint_minmax(const char *val,
3268 const struct kernel_param *kp,
3269 unsigned int min, unsigned int max)
3270 {
3271 unsigned int num;
3272 int ret;
3273
3274 if (!val)
3275 return -EINVAL;
3276 ret = kstrtouint(val, 0, &num);
3277 if (ret)
3278 return ret;
3279 if (num < min || num > max)
3280 return -EINVAL;
3281 *((unsigned int *)kp->arg) = num;
3282 return 0;
3283 }
3284
3285 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3286 {
3287 return param_set_uint_minmax(val, kp,
3288 RPC_MIN_RESVPORT,
3289 RPC_MAX_RESVPORT);
3290 }
3291
3292 static const struct kernel_param_ops param_ops_portnr = {
3293 .set = param_set_portnr,
3294 .get = param_get_uint,
3295 };
3296
3297 #define param_check_portnr(name, p) \
3298 __param_check(name, p, unsigned int);
3299
3300 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3301 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3302
3303 static int param_set_slot_table_size(const char *val,
3304 const struct kernel_param *kp)
3305 {
3306 return param_set_uint_minmax(val, kp,
3307 RPC_MIN_SLOT_TABLE,
3308 RPC_MAX_SLOT_TABLE);
3309 }
3310
3311 static const struct kernel_param_ops param_ops_slot_table_size = {
3312 .set = param_set_slot_table_size,
3313 .get = param_get_uint,
3314 };
3315
3316 #define param_check_slot_table_size(name, p) \
3317 __param_check(name, p, unsigned int);
3318
3319 static int param_set_max_slot_table_size(const char *val,
3320 const struct kernel_param *kp)
3321 {
3322 return param_set_uint_minmax(val, kp,
3323 RPC_MIN_SLOT_TABLE,
3324 RPC_MAX_SLOT_TABLE_LIMIT);
3325 }
3326
3327 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3328 .set = param_set_max_slot_table_size,
3329 .get = param_get_uint,
3330 };
3331
3332 #define param_check_max_slot_table_size(name, p) \
3333 __param_check(name, p, unsigned int);
3334
3335 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3336 slot_table_size, 0644);
3337 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3338 max_slot_table_size, 0644);
3339 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3340 slot_table_size, 0644);