1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/net/sunrpc/xprtsock.c
4 *
5 * Client-side transport implementation for sockets.
6 *
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 *
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 *
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 *
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
20 */
21
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/pagemap.h>
28 #include <linux/errno.h>
29 #include <linux/socket.h>
30 #include <linux/in.h>
31 #include <linux/net.h>
32 #include <linux/mm.h>
33 #include <linux/un.h>
34 #include <linux/udp.h>
35 #include <linux/tcp.h>
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/addr.h>
38 #include <linux/sunrpc/sched.h>
39 #include <linux/sunrpc/svcsock.h>
40 #include <linux/sunrpc/xprtsock.h>
41 #include <linux/file.h>
42 #ifdef CONFIG_SUNRPC_BACKCHANNEL
43 #include <linux/sunrpc/bc_xprt.h>
44 #endif
45
46 #include <net/sock.h>
47 #include <net/checksum.h>
48 #include <net/udp.h>
49 #include <net/tcp.h>
50 #include <linux/bvec.h>
51 #include <linux/highmem.h>
52 #include <linux/uio.h>
53 #include <linux/sched/mm.h>
54
55 #include <trace/events/sunrpc.h>
56
57 #include "socklib.h"
58 #include "sunrpc.h"
59
60 static void xs_close(struct rpc_xprt *xprt);
61 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
62 struct socket *sock);
63
64 /*
65 * xprtsock tunables
66 */
67 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
68 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
69 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
70
71 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
72 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
73
74 #define XS_TCP_LINGER_TO (15U * HZ)
75 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
76
77 /*
78 * We can register our own files under /proc/sys/sunrpc by
79 * calling register_sysctl_table() again. The files in that
80 * directory become the union of all files registered there.
81 *
82 * We simply need to make sure that we don't collide with
83 * someone else's file names!
84 */
85
86 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
87 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
88 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
89 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
90 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
91
92 static struct ctl_table_header *sunrpc_table_header;
93
94 static struct xprt_class xs_local_transport;
95 static struct xprt_class xs_udp_transport;
96 static struct xprt_class xs_tcp_transport;
97 static struct xprt_class xs_bc_tcp_transport;
98
99 /*
100 * FIXME: changing the UDP slot table size should also resize the UDP
101 * socket buffers for existing UDP transports
102 */
103 static struct ctl_table xs_tunables_table[] = {
104 {
105 .procname = "udp_slot_table_entries",
106 .data = &xprt_udp_slot_table_entries,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &min_slot_table_size,
111 .extra2 = &max_slot_table_size
112 },
113 {
114 .procname = "tcp_slot_table_entries",
115 .data = &xprt_tcp_slot_table_entries,
116 .maxlen = sizeof(unsigned int),
117 .mode = 0644,
118 .proc_handler = proc_dointvec_minmax,
119 .extra1 = &min_slot_table_size,
120 .extra2 = &max_slot_table_size
121 },
122 {
123 .procname = "tcp_max_slot_table_entries",
124 .data = &xprt_max_tcp_slot_table_entries,
125 .maxlen = sizeof(unsigned int),
126 .mode = 0644,
127 .proc_handler = proc_dointvec_minmax,
128 .extra1 = &min_slot_table_size,
129 .extra2 = &max_tcp_slot_table_limit
130 },
131 {
132 .procname = "min_resvport",
133 .data = &xprt_min_resvport,
134 .maxlen = sizeof(unsigned int),
135 .mode = 0644,
136 .proc_handler = proc_dointvec_minmax,
137 .extra1 = &xprt_min_resvport_limit,
138 .extra2 = &xprt_max_resvport_limit
139 },
140 {
141 .procname = "max_resvport",
142 .data = &xprt_max_resvport,
143 .maxlen = sizeof(unsigned int),
144 .mode = 0644,
145 .proc_handler = proc_dointvec_minmax,
146 .extra1 = &xprt_min_resvport_limit,
147 .extra2 = &xprt_max_resvport_limit
148 },
149 {
150 .procname = "tcp_fin_timeout",
151 .data = &xs_tcp_fin_timeout,
152 .maxlen = sizeof(xs_tcp_fin_timeout),
153 .mode = 0644,
154 .proc_handler = proc_dointvec_jiffies,
155 },
156 { },
157 };
158
159 static struct ctl_table sunrpc_table[] = {
160 {
161 .procname = "sunrpc",
162 .mode = 0555,
163 .child = xs_tunables_table
164 },
165 { },
166 };
167
168 /*
169 * Wait duration for a reply from the RPC portmapper.
170 */
171 #define XS_BIND_TO (60U * HZ)
172
173 /*
174 * Delay if a UDP socket connect error occurs. This is most likely some
175 * kind of resource problem on the local host.
176 */
177 #define XS_UDP_REEST_TO (2U * HZ)
178
179 /*
180 * The reestablish timeout allows clients to delay for a bit before attempting
181 * to reconnect to a server that just dropped our connection.
182 *
183 * We implement an exponential backoff when trying to reestablish a TCP
184 * transport connection with the server. Some servers like to drop a TCP
185 * connection when they are overworked, so we start with a short timeout and
186 * increase over time if the server is down or not responding.
187 */
188 #define XS_TCP_INIT_REEST_TO (3U * HZ)
189
190 /*
191 * TCP idle timeout; client drops the transport socket if it is idle
192 * for this long. Note that we also timeout UDP sockets to prevent
193 * holding port numbers when there is no RPC traffic.
194 */
195 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
196
197 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
198 # undef RPC_DEBUG_DATA
199 # define RPCDBG_FACILITY RPCDBG_TRANS
200 #endif
201
202 #ifdef RPC_DEBUG_DATA
xs_pktdump(char * msg,u32 * packet,unsigned int count)203 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
204 {
205 u8 *buf = (u8 *) packet;
206 int j;
207
208 dprintk("RPC: %s\n", msg);
209 for (j = 0; j < count && j < 128; j += 4) {
210 if (!(j & 31)) {
211 if (j)
212 dprintk("\n");
213 dprintk("0x%04x ", j);
214 }
215 dprintk("%02x%02x%02x%02x ",
216 buf[j], buf[j+1], buf[j+2], buf[j+3]);
217 }
218 dprintk("\n");
219 }
220 #else
xs_pktdump(char * msg,u32 * packet,unsigned int count)221 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
222 {
223 /* NOP */
224 }
225 #endif
226
xprt_from_sock(struct sock * sk)227 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
228 {
229 return (struct rpc_xprt *) sk->sk_user_data;
230 }
231
xs_addr(struct rpc_xprt * xprt)232 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
233 {
234 return (struct sockaddr *) &xprt->addr;
235 }
236
xs_addr_un(struct rpc_xprt * xprt)237 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
238 {
239 return (struct sockaddr_un *) &xprt->addr;
240 }
241
xs_addr_in(struct rpc_xprt * xprt)242 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
243 {
244 return (struct sockaddr_in *) &xprt->addr;
245 }
246
xs_addr_in6(struct rpc_xprt * xprt)247 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
248 {
249 return (struct sockaddr_in6 *) &xprt->addr;
250 }
251
xs_format_common_peer_addresses(struct rpc_xprt * xprt)252 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
253 {
254 struct sockaddr *sap = xs_addr(xprt);
255 struct sockaddr_in6 *sin6;
256 struct sockaddr_in *sin;
257 struct sockaddr_un *sun;
258 char buf[128];
259
260 switch (sap->sa_family) {
261 case AF_LOCAL:
262 sun = xs_addr_un(xprt);
263 strlcpy(buf, sun->sun_path, sizeof(buf));
264 xprt->address_strings[RPC_DISPLAY_ADDR] =
265 kstrdup(buf, GFP_KERNEL);
266 break;
267 case AF_INET:
268 (void)rpc_ntop(sap, buf, sizeof(buf));
269 xprt->address_strings[RPC_DISPLAY_ADDR] =
270 kstrdup(buf, GFP_KERNEL);
271 sin = xs_addr_in(xprt);
272 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
273 break;
274 case AF_INET6:
275 (void)rpc_ntop(sap, buf, sizeof(buf));
276 xprt->address_strings[RPC_DISPLAY_ADDR] =
277 kstrdup(buf, GFP_KERNEL);
278 sin6 = xs_addr_in6(xprt);
279 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
280 break;
281 default:
282 BUG();
283 }
284
285 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
286 }
287
xs_format_common_peer_ports(struct rpc_xprt * xprt)288 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
289 {
290 struct sockaddr *sap = xs_addr(xprt);
291 char buf[128];
292
293 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
294 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
295
296 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
297 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
298 }
299
xs_format_peer_addresses(struct rpc_xprt * xprt,const char * protocol,const char * netid)300 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
301 const char *protocol,
302 const char *netid)
303 {
304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
305 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
306 xs_format_common_peer_addresses(xprt);
307 xs_format_common_peer_ports(xprt);
308 }
309
xs_update_peer_port(struct rpc_xprt * xprt)310 static void xs_update_peer_port(struct rpc_xprt *xprt)
311 {
312 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
313 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
314
315 xs_format_common_peer_ports(xprt);
316 }
317
xs_free_peer_addresses(struct rpc_xprt * xprt)318 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
319 {
320 unsigned int i;
321
322 for (i = 0; i < RPC_DISPLAY_MAX; i++)
323 switch (i) {
324 case RPC_DISPLAY_PROTO:
325 case RPC_DISPLAY_NETID:
326 continue;
327 default:
328 kfree(xprt->address_strings[i]);
329 }
330 }
331
332 static size_t
xs_alloc_sparse_pages(struct xdr_buf * buf,size_t want,gfp_t gfp)333 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
334 {
335 size_t i,n;
336
337 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
338 return want;
339 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
340 for (i = 0; i < n; i++) {
341 if (buf->pages[i])
342 continue;
343 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
344 if (!buf->pages[i]) {
345 i *= PAGE_SIZE;
346 return i > buf->page_base ? i - buf->page_base : 0;
347 }
348 }
349 return want;
350 }
351
352 static ssize_t
xs_sock_recvmsg(struct socket * sock,struct msghdr * msg,int flags,size_t seek)353 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
354 {
355 ssize_t ret;
356 if (seek != 0)
357 iov_iter_advance(&msg->msg_iter, seek);
358 ret = sock_recvmsg(sock, msg, flags);
359 return ret > 0 ? ret + seek : ret;
360 }
361
362 static ssize_t
xs_read_kvec(struct socket * sock,struct msghdr * msg,int flags,struct kvec * kvec,size_t count,size_t seek)363 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
364 struct kvec *kvec, size_t count, size_t seek)
365 {
366 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
367 return xs_sock_recvmsg(sock, msg, flags, seek);
368 }
369
370 static ssize_t
xs_read_bvec(struct socket * sock,struct msghdr * msg,int flags,struct bio_vec * bvec,unsigned long nr,size_t count,size_t seek)371 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
372 struct bio_vec *bvec, unsigned long nr, size_t count,
373 size_t seek)
374 {
375 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
376 return xs_sock_recvmsg(sock, msg, flags, seek);
377 }
378
379 static ssize_t
xs_read_discard(struct socket * sock,struct msghdr * msg,int flags,size_t count)380 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
381 size_t count)
382 {
383 iov_iter_discard(&msg->msg_iter, READ, count);
384 return sock_recvmsg(sock, msg, flags);
385 }
386
387 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
388 static void
xs_flush_bvec(const struct bio_vec * bvec,size_t count,size_t seek)389 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
390 {
391 struct bvec_iter bi = {
392 .bi_size = count,
393 };
394 struct bio_vec bv;
395
396 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
397 for_each_bvec(bv, bvec, bi, bi)
398 flush_dcache_page(bv.bv_page);
399 }
400 #else
401 static inline void
xs_flush_bvec(const struct bio_vec * bvec,size_t count,size_t seek)402 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
403 {
404 }
405 #endif
406
407 static ssize_t
xs_read_xdr_buf(struct socket * sock,struct msghdr * msg,int flags,struct xdr_buf * buf,size_t count,size_t seek,size_t * read)408 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
409 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
410 {
411 size_t want, seek_init = seek, offset = 0;
412 ssize_t ret;
413
414 want = min_t(size_t, count, buf->head[0].iov_len);
415 if (seek < want) {
416 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
417 if (ret <= 0)
418 goto sock_err;
419 offset += ret;
420 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
421 goto out;
422 if (ret != want)
423 goto out;
424 seek = 0;
425 } else {
426 seek -= want;
427 offset += want;
428 }
429
430 want = xs_alloc_sparse_pages(buf,
431 min_t(size_t, count - offset, buf->page_len),
432 GFP_KERNEL);
433 if (seek < want) {
434 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
435 xdr_buf_pagecount(buf),
436 want + buf->page_base,
437 seek + buf->page_base);
438 if (ret <= 0)
439 goto sock_err;
440 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
441 ret -= buf->page_base;
442 offset += ret;
443 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
444 goto out;
445 if (ret != want)
446 goto out;
447 seek = 0;
448 } else {
449 seek -= want;
450 offset += want;
451 }
452
453 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
454 if (seek < want) {
455 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
456 if (ret <= 0)
457 goto sock_err;
458 offset += ret;
459 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
460 goto out;
461 if (ret != want)
462 goto out;
463 } else if (offset < seek_init)
464 offset = seek_init;
465 ret = -EMSGSIZE;
466 out:
467 *read = offset - seek_init;
468 return ret;
469 sock_err:
470 offset += seek;
471 goto out;
472 }
473
474 static void
xs_read_header(struct sock_xprt * transport,struct xdr_buf * buf)475 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
476 {
477 if (!transport->recv.copied) {
478 if (buf->head[0].iov_len >= transport->recv.offset)
479 memcpy(buf->head[0].iov_base,
480 &transport->recv.xid,
481 transport->recv.offset);
482 transport->recv.copied = transport->recv.offset;
483 }
484 }
485
486 static bool
xs_read_stream_request_done(struct sock_xprt * transport)487 xs_read_stream_request_done(struct sock_xprt *transport)
488 {
489 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
490 }
491
492 static void
xs_read_stream_check_eor(struct sock_xprt * transport,struct msghdr * msg)493 xs_read_stream_check_eor(struct sock_xprt *transport,
494 struct msghdr *msg)
495 {
496 if (xs_read_stream_request_done(transport))
497 msg->msg_flags |= MSG_EOR;
498 }
499
500 static ssize_t
xs_read_stream_request(struct sock_xprt * transport,struct msghdr * msg,int flags,struct rpc_rqst * req)501 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
502 int flags, struct rpc_rqst *req)
503 {
504 struct xdr_buf *buf = &req->rq_private_buf;
505 size_t want, read;
506 ssize_t ret;
507
508 xs_read_header(transport, buf);
509
510 want = transport->recv.len - transport->recv.offset;
511 if (want != 0) {
512 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
513 transport->recv.copied + want,
514 transport->recv.copied,
515 &read);
516 transport->recv.offset += read;
517 transport->recv.copied += read;
518 }
519
520 if (transport->recv.offset == transport->recv.len)
521 xs_read_stream_check_eor(transport, msg);
522
523 if (want == 0)
524 return 0;
525
526 switch (ret) {
527 default:
528 break;
529 case -EFAULT:
530 case -EMSGSIZE:
531 msg->msg_flags |= MSG_TRUNC;
532 return read;
533 case 0:
534 return -ESHUTDOWN;
535 }
536 return ret < 0 ? ret : read;
537 }
538
539 static size_t
xs_read_stream_headersize(bool isfrag)540 xs_read_stream_headersize(bool isfrag)
541 {
542 if (isfrag)
543 return sizeof(__be32);
544 return 3 * sizeof(__be32);
545 }
546
547 static ssize_t
xs_read_stream_header(struct sock_xprt * transport,struct msghdr * msg,int flags,size_t want,size_t seek)548 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
549 int flags, size_t want, size_t seek)
550 {
551 struct kvec kvec = {
552 .iov_base = &transport->recv.fraghdr,
553 .iov_len = want,
554 };
555 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
556 }
557
558 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
559 static ssize_t
xs_read_stream_call(struct sock_xprt * transport,struct msghdr * msg,int flags)560 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
561 {
562 struct rpc_xprt *xprt = &transport->xprt;
563 struct rpc_rqst *req;
564 ssize_t ret;
565
566 /* Is this transport associated with the backchannel? */
567 if (!xprt->bc_serv)
568 return -ESHUTDOWN;
569
570 /* Look up and lock the request corresponding to the given XID */
571 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
572 if (!req) {
573 printk(KERN_WARNING "Callback slot table overflowed\n");
574 return -ESHUTDOWN;
575 }
576 if (transport->recv.copied && !req->rq_private_buf.len)
577 return -ESHUTDOWN;
578
579 ret = xs_read_stream_request(transport, msg, flags, req);
580 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
581 xprt_complete_bc_request(req, transport->recv.copied);
582 else
583 req->rq_private_buf.len = transport->recv.copied;
584
585 return ret;
586 }
587 #else /* CONFIG_SUNRPC_BACKCHANNEL */
588 static ssize_t
xs_read_stream_call(struct sock_xprt * transport,struct msghdr * msg,int flags)589 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
590 {
591 return -ESHUTDOWN;
592 }
593 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
594
595 static ssize_t
xs_read_stream_reply(struct sock_xprt * transport,struct msghdr * msg,int flags)596 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
597 {
598 struct rpc_xprt *xprt = &transport->xprt;
599 struct rpc_rqst *req;
600 ssize_t ret = 0;
601
602 /* Look up and lock the request corresponding to the given XID */
603 spin_lock(&xprt->queue_lock);
604 req = xprt_lookup_rqst(xprt, transport->recv.xid);
605 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
606 msg->msg_flags |= MSG_TRUNC;
607 goto out;
608 }
609 xprt_pin_rqst(req);
610 spin_unlock(&xprt->queue_lock);
611
612 ret = xs_read_stream_request(transport, msg, flags, req);
613
614 spin_lock(&xprt->queue_lock);
615 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
616 xprt_complete_rqst(req->rq_task, transport->recv.copied);
617 else
618 req->rq_private_buf.len = transport->recv.copied;
619 xprt_unpin_rqst(req);
620 out:
621 spin_unlock(&xprt->queue_lock);
622 return ret;
623 }
624
625 static ssize_t
xs_read_stream(struct sock_xprt * transport,int flags)626 xs_read_stream(struct sock_xprt *transport, int flags)
627 {
628 struct msghdr msg = { 0 };
629 size_t want, read = 0;
630 ssize_t ret = 0;
631
632 if (transport->recv.len == 0) {
633 want = xs_read_stream_headersize(transport->recv.copied != 0);
634 ret = xs_read_stream_header(transport, &msg, flags, want,
635 transport->recv.offset);
636 if (ret <= 0)
637 goto out_err;
638 transport->recv.offset = ret;
639 if (transport->recv.offset != want)
640 return transport->recv.offset;
641 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
642 RPC_FRAGMENT_SIZE_MASK;
643 transport->recv.offset -= sizeof(transport->recv.fraghdr);
644 read = ret;
645 }
646
647 switch (be32_to_cpu(transport->recv.calldir)) {
648 default:
649 msg.msg_flags |= MSG_TRUNC;
650 break;
651 case RPC_CALL:
652 ret = xs_read_stream_call(transport, &msg, flags);
653 break;
654 case RPC_REPLY:
655 ret = xs_read_stream_reply(transport, &msg, flags);
656 }
657 if (msg.msg_flags & MSG_TRUNC) {
658 transport->recv.calldir = cpu_to_be32(-1);
659 transport->recv.copied = -1;
660 }
661 if (ret < 0)
662 goto out_err;
663 read += ret;
664 if (transport->recv.offset < transport->recv.len) {
665 if (!(msg.msg_flags & MSG_TRUNC))
666 return read;
667 msg.msg_flags = 0;
668 ret = xs_read_discard(transport->sock, &msg, flags,
669 transport->recv.len - transport->recv.offset);
670 if (ret <= 0)
671 goto out_err;
672 transport->recv.offset += ret;
673 read += ret;
674 if (transport->recv.offset != transport->recv.len)
675 return read;
676 }
677 if (xs_read_stream_request_done(transport)) {
678 trace_xs_stream_read_request(transport);
679 transport->recv.copied = 0;
680 }
681 transport->recv.offset = 0;
682 transport->recv.len = 0;
683 return read;
684 out_err:
685 return ret != 0 ? ret : -ESHUTDOWN;
686 }
687
xs_poll_socket(struct sock_xprt * transport)688 static __poll_t xs_poll_socket(struct sock_xprt *transport)
689 {
690 return transport->sock->ops->poll(transport->file, transport->sock,
691 NULL);
692 }
693
xs_poll_socket_readable(struct sock_xprt * transport)694 static bool xs_poll_socket_readable(struct sock_xprt *transport)
695 {
696 __poll_t events = xs_poll_socket(transport);
697
698 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
699 }
700
xs_poll_check_readable(struct sock_xprt * transport)701 static void xs_poll_check_readable(struct sock_xprt *transport)
702 {
703
704 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
705 if (!xs_poll_socket_readable(transport))
706 return;
707 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
708 queue_work(xprtiod_workqueue, &transport->recv_worker);
709 }
710
xs_stream_data_receive(struct sock_xprt * transport)711 static void xs_stream_data_receive(struct sock_xprt *transport)
712 {
713 size_t read = 0;
714 ssize_t ret = 0;
715
716 mutex_lock(&transport->recv_mutex);
717 if (transport->sock == NULL)
718 goto out;
719 for (;;) {
720 ret = xs_read_stream(transport, MSG_DONTWAIT);
721 if (ret < 0)
722 break;
723 read += ret;
724 cond_resched();
725 }
726 if (ret == -ESHUTDOWN)
727 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
728 else
729 xs_poll_check_readable(transport);
730 out:
731 mutex_unlock(&transport->recv_mutex);
732 trace_xs_stream_read_data(&transport->xprt, ret, read);
733 }
734
xs_stream_data_receive_workfn(struct work_struct * work)735 static void xs_stream_data_receive_workfn(struct work_struct *work)
736 {
737 struct sock_xprt *transport =
738 container_of(work, struct sock_xprt, recv_worker);
739 unsigned int pflags = memalloc_nofs_save();
740
741 xs_stream_data_receive(transport);
742 memalloc_nofs_restore(pflags);
743 }
744
745 static void
xs_stream_reset_connect(struct sock_xprt * transport)746 xs_stream_reset_connect(struct sock_xprt *transport)
747 {
748 transport->recv.offset = 0;
749 transport->recv.len = 0;
750 transport->recv.copied = 0;
751 transport->xmit.offset = 0;
752 }
753
754 static void
xs_stream_start_connect(struct sock_xprt * transport)755 xs_stream_start_connect(struct sock_xprt *transport)
756 {
757 transport->xprt.stat.connect_count++;
758 transport->xprt.stat.connect_start = jiffies;
759 }
760
761 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
762
763 /**
764 * xs_nospace - handle transmit was incomplete
765 * @req: pointer to RPC request
766 * @transport: pointer to struct sock_xprt
767 *
768 */
xs_nospace(struct rpc_rqst * req,struct sock_xprt * transport)769 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
770 {
771 struct rpc_xprt *xprt = &transport->xprt;
772 struct sock *sk = transport->inet;
773 int ret = -EAGAIN;
774
775 trace_rpc_socket_nospace(req, transport);
776
777 /* Protect against races with write_space */
778 spin_lock(&xprt->transport_lock);
779
780 /* Don't race with disconnect */
781 if (xprt_connected(xprt)) {
782 struct socket_wq *wq;
783
784 rcu_read_lock();
785 wq = rcu_dereference(sk->sk_wq);
786 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
787 rcu_read_unlock();
788
789 /* wait for more buffer space */
790 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
791 sk->sk_write_pending++;
792 xprt_wait_for_buffer_space(xprt);
793 } else
794 ret = -ENOTCONN;
795
796 spin_unlock(&xprt->transport_lock);
797 return ret;
798 }
799
xs_sock_nospace(struct rpc_rqst * req)800 static int xs_sock_nospace(struct rpc_rqst *req)
801 {
802 struct sock_xprt *transport =
803 container_of(req->rq_xprt, struct sock_xprt, xprt);
804 struct sock *sk = transport->inet;
805 int ret = -EAGAIN;
806
807 lock_sock(sk);
808 if (!sock_writeable(sk))
809 ret = xs_nospace(req, transport);
810 release_sock(sk);
811 return ret;
812 }
813
xs_stream_nospace(struct rpc_rqst * req)814 static int xs_stream_nospace(struct rpc_rqst *req)
815 {
816 struct sock_xprt *transport =
817 container_of(req->rq_xprt, struct sock_xprt, xprt);
818 struct sock *sk = transport->inet;
819 int ret = -EAGAIN;
820
821 lock_sock(sk);
822 if (!sk_stream_memory_free(sk))
823 ret = xs_nospace(req, transport);
824 release_sock(sk);
825 return ret;
826 }
827
828 static void
xs_stream_prepare_request(struct rpc_rqst * req)829 xs_stream_prepare_request(struct rpc_rqst *req)
830 {
831 xdr_free_bvec(&req->rq_rcv_buf);
832 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
833 }
834
835 /*
836 * Determine if the previous message in the stream was aborted before it
837 * could complete transmission.
838 */
839 static bool
xs_send_request_was_aborted(struct sock_xprt * transport,struct rpc_rqst * req)840 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
841 {
842 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
843 }
844
845 /*
846 * Return the stream record marker field for a record of length < 2^31-1
847 */
848 static rpc_fraghdr
xs_stream_record_marker(struct xdr_buf * xdr)849 xs_stream_record_marker(struct xdr_buf *xdr)
850 {
851 if (!xdr->len)
852 return 0;
853 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
854 }
855
856 /**
857 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
858 * @req: pointer to RPC request
859 *
860 * Return values:
861 * 0: The request has been sent
862 * EAGAIN: The socket was blocked, please call again later to
863 * complete the request
864 * ENOTCONN: Caller needs to invoke connect logic then call again
865 * other: Some other error occurred, the request was not sent
866 */
xs_local_send_request(struct rpc_rqst * req)867 static int xs_local_send_request(struct rpc_rqst *req)
868 {
869 struct rpc_xprt *xprt = req->rq_xprt;
870 struct sock_xprt *transport =
871 container_of(xprt, struct sock_xprt, xprt);
872 struct xdr_buf *xdr = &req->rq_snd_buf;
873 rpc_fraghdr rm = xs_stream_record_marker(xdr);
874 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
875 struct msghdr msg = {
876 .msg_flags = XS_SENDMSG_FLAGS,
877 };
878 unsigned int sent;
879 int status;
880
881 /* Close the stream if the previous transmission was incomplete */
882 if (xs_send_request_was_aborted(transport, req)) {
883 xprt_force_disconnect(xprt);
884 return -ENOTCONN;
885 }
886
887 xs_pktdump("packet data:",
888 req->rq_svec->iov_base, req->rq_svec->iov_len);
889
890 req->rq_xtime = ktime_get();
891 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
892 transport->xmit.offset, rm, &sent);
893 dprintk("RPC: %s(%u) = %d\n",
894 __func__, xdr->len - transport->xmit.offset, status);
895
896 if (status == -EAGAIN && sock_writeable(transport->inet))
897 status = -ENOBUFS;
898
899 if (likely(sent > 0) || status == 0) {
900 transport->xmit.offset += sent;
901 req->rq_bytes_sent = transport->xmit.offset;
902 if (likely(req->rq_bytes_sent >= msglen)) {
903 req->rq_xmit_bytes_sent += transport->xmit.offset;
904 transport->xmit.offset = 0;
905 return 0;
906 }
907 status = -EAGAIN;
908 }
909
910 switch (status) {
911 case -ENOBUFS:
912 break;
913 case -EAGAIN:
914 status = xs_stream_nospace(req);
915 break;
916 default:
917 dprintk("RPC: sendmsg returned unrecognized error %d\n",
918 -status);
919 fallthrough;
920 case -EPIPE:
921 xprt_force_disconnect(xprt);
922 status = -ENOTCONN;
923 }
924
925 return status;
926 }
927
928 /**
929 * xs_udp_send_request - write an RPC request to a UDP socket
930 * @req: pointer to RPC request
931 *
932 * Return values:
933 * 0: The request has been sent
934 * EAGAIN: The socket was blocked, please call again later to
935 * complete the request
936 * ENOTCONN: Caller needs to invoke connect logic then call again
937 * other: Some other error occurred, the request was not sent
938 */
xs_udp_send_request(struct rpc_rqst * req)939 static int xs_udp_send_request(struct rpc_rqst *req)
940 {
941 struct rpc_xprt *xprt = req->rq_xprt;
942 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
943 struct xdr_buf *xdr = &req->rq_snd_buf;
944 struct msghdr msg = {
945 .msg_name = xs_addr(xprt),
946 .msg_namelen = xprt->addrlen,
947 .msg_flags = XS_SENDMSG_FLAGS,
948 };
949 unsigned int sent;
950 int status;
951
952 xs_pktdump("packet data:",
953 req->rq_svec->iov_base,
954 req->rq_svec->iov_len);
955
956 if (!xprt_bound(xprt))
957 return -ENOTCONN;
958
959 if (!xprt_request_get_cong(xprt, req))
960 return -EBADSLT;
961
962 req->rq_xtime = ktime_get();
963 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
964
965 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
966 xdr->len, status);
967
968 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
969 if (status == -EPERM)
970 goto process_status;
971
972 if (status == -EAGAIN && sock_writeable(transport->inet))
973 status = -ENOBUFS;
974
975 if (sent > 0 || status == 0) {
976 req->rq_xmit_bytes_sent += sent;
977 if (sent >= req->rq_slen)
978 return 0;
979 /* Still some bytes left; set up for a retry later. */
980 status = -EAGAIN;
981 }
982
983 process_status:
984 switch (status) {
985 case -ENOTSOCK:
986 status = -ENOTCONN;
987 /* Should we call xs_close() here? */
988 break;
989 case -EAGAIN:
990 status = xs_sock_nospace(req);
991 break;
992 case -ENETUNREACH:
993 case -ENOBUFS:
994 case -EPIPE:
995 case -ECONNREFUSED:
996 case -EPERM:
997 /* When the server has died, an ICMP port unreachable message
998 * prompts ECONNREFUSED. */
999 break;
1000 default:
1001 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1002 -status);
1003 }
1004
1005 return status;
1006 }
1007
1008 /**
1009 * xs_tcp_send_request - write an RPC request to a TCP socket
1010 * @req: pointer to RPC request
1011 *
1012 * Return values:
1013 * 0: The request has been sent
1014 * EAGAIN: The socket was blocked, please call again later to
1015 * complete the request
1016 * ENOTCONN: Caller needs to invoke connect logic then call again
1017 * other: Some other error occurred, the request was not sent
1018 *
1019 * XXX: In the case of soft timeouts, should we eventually give up
1020 * if sendmsg is not able to make progress?
1021 */
xs_tcp_send_request(struct rpc_rqst * req)1022 static int xs_tcp_send_request(struct rpc_rqst *req)
1023 {
1024 struct rpc_xprt *xprt = req->rq_xprt;
1025 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1026 struct xdr_buf *xdr = &req->rq_snd_buf;
1027 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1028 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1029 struct msghdr msg = {
1030 .msg_flags = XS_SENDMSG_FLAGS,
1031 };
1032 bool vm_wait = false;
1033 unsigned int sent;
1034 int status;
1035
1036 /* Close the stream if the previous transmission was incomplete */
1037 if (xs_send_request_was_aborted(transport, req)) {
1038 if (transport->sock != NULL)
1039 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1040 return -ENOTCONN;
1041 }
1042 if (!transport->inet)
1043 return -ENOTCONN;
1044
1045 xs_pktdump("packet data:",
1046 req->rq_svec->iov_base,
1047 req->rq_svec->iov_len);
1048
1049 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1050 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1051
1052 /* Continue transmitting the packet/record. We must be careful
1053 * to cope with writespace callbacks arriving _after_ we have
1054 * called sendmsg(). */
1055 req->rq_xtime = ktime_get();
1056 tcp_sock_set_cork(transport->inet, true);
1057 while (1) {
1058 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1059 transport->xmit.offset, rm, &sent);
1060
1061 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1062 xdr->len - transport->xmit.offset, status);
1063
1064 /* If we've sent the entire packet, immediately
1065 * reset the count of bytes sent. */
1066 transport->xmit.offset += sent;
1067 req->rq_bytes_sent = transport->xmit.offset;
1068 if (likely(req->rq_bytes_sent >= msglen)) {
1069 req->rq_xmit_bytes_sent += transport->xmit.offset;
1070 transport->xmit.offset = 0;
1071 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1072 tcp_sock_set_cork(transport->inet, false);
1073 return 0;
1074 }
1075
1076 WARN_ON_ONCE(sent == 0 && status == 0);
1077
1078 if (status == -EAGAIN ) {
1079 /*
1080 * Return EAGAIN if we're sure we're hitting the
1081 * socket send buffer limits.
1082 */
1083 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1084 break;
1085 /*
1086 * Did we hit a memory allocation failure?
1087 */
1088 if (sent == 0) {
1089 status = -ENOBUFS;
1090 if (vm_wait)
1091 break;
1092 /* Retry, knowing now that we're below the
1093 * socket send buffer limit
1094 */
1095 vm_wait = true;
1096 }
1097 continue;
1098 }
1099 if (status < 0)
1100 break;
1101 vm_wait = false;
1102 }
1103
1104 switch (status) {
1105 case -ENOTSOCK:
1106 status = -ENOTCONN;
1107 /* Should we call xs_close() here? */
1108 break;
1109 case -EAGAIN:
1110 status = xs_stream_nospace(req);
1111 break;
1112 case -ECONNRESET:
1113 case -ECONNREFUSED:
1114 case -ENOTCONN:
1115 case -EADDRINUSE:
1116 case -ENOBUFS:
1117 case -EPIPE:
1118 break;
1119 default:
1120 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1121 -status);
1122 }
1123
1124 return status;
1125 }
1126
xs_save_old_callbacks(struct sock_xprt * transport,struct sock * sk)1127 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1128 {
1129 transport->old_data_ready = sk->sk_data_ready;
1130 transport->old_state_change = sk->sk_state_change;
1131 transport->old_write_space = sk->sk_write_space;
1132 transport->old_error_report = sk->sk_error_report;
1133 }
1134
xs_restore_old_callbacks(struct sock_xprt * transport,struct sock * sk)1135 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1136 {
1137 sk->sk_data_ready = transport->old_data_ready;
1138 sk->sk_state_change = transport->old_state_change;
1139 sk->sk_write_space = transport->old_write_space;
1140 sk->sk_error_report = transport->old_error_report;
1141 }
1142
xs_sock_reset_state_flags(struct rpc_xprt * xprt)1143 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1144 {
1145 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1146
1147 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1148 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1149 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1150 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1151 }
1152
xs_run_error_worker(struct sock_xprt * transport,unsigned int nr)1153 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1154 {
1155 set_bit(nr, &transport->sock_state);
1156 queue_work(xprtiod_workqueue, &transport->error_worker);
1157 }
1158
xs_sock_reset_connection_flags(struct rpc_xprt * xprt)1159 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1160 {
1161 smp_mb__before_atomic();
1162 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1163 clear_bit(XPRT_CLOSING, &xprt->state);
1164 xs_sock_reset_state_flags(xprt);
1165 smp_mb__after_atomic();
1166 }
1167
1168 /**
1169 * xs_error_report - callback to handle TCP socket state errors
1170 * @sk: socket
1171 *
1172 * Note: we don't call sock_error() since there may be a rpc_task
1173 * using the socket, and so we don't want to clear sk->sk_err.
1174 */
xs_error_report(struct sock * sk)1175 static void xs_error_report(struct sock *sk)
1176 {
1177 struct sock_xprt *transport;
1178 struct rpc_xprt *xprt;
1179
1180 read_lock_bh(&sk->sk_callback_lock);
1181 if (!(xprt = xprt_from_sock(sk)))
1182 goto out;
1183
1184 transport = container_of(xprt, struct sock_xprt, xprt);
1185 transport->xprt_err = -sk->sk_err;
1186 if (transport->xprt_err == 0)
1187 goto out;
1188 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1189 xprt, -transport->xprt_err);
1190 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1191
1192 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1193 smp_mb__before_atomic();
1194 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1195 out:
1196 read_unlock_bh(&sk->sk_callback_lock);
1197 }
1198
xs_reset_transport(struct sock_xprt * transport)1199 static void xs_reset_transport(struct sock_xprt *transport)
1200 {
1201 struct socket *sock = transport->sock;
1202 struct sock *sk = transport->inet;
1203 struct rpc_xprt *xprt = &transport->xprt;
1204 struct file *filp = transport->file;
1205
1206 if (sk == NULL)
1207 return;
1208 /*
1209 * Make sure we're calling this in a context from which it is safe
1210 * to call __fput_sync(). In practice that means rpciod and the
1211 * system workqueue.
1212 */
1213 if (!(current->flags & PF_WQ_WORKER)) {
1214 WARN_ON_ONCE(1);
1215 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1216 return;
1217 }
1218
1219 if (atomic_read(&transport->xprt.swapper))
1220 sk_clear_memalloc(sk);
1221
1222 kernel_sock_shutdown(sock, SHUT_RDWR);
1223
1224 mutex_lock(&transport->recv_mutex);
1225 write_lock_bh(&sk->sk_callback_lock);
1226 transport->inet = NULL;
1227 transport->sock = NULL;
1228 transport->file = NULL;
1229
1230 sk->sk_user_data = NULL;
1231
1232 xs_restore_old_callbacks(transport, sk);
1233 xprt_clear_connected(xprt);
1234 write_unlock_bh(&sk->sk_callback_lock);
1235 xs_sock_reset_connection_flags(xprt);
1236 /* Reset stream record info */
1237 xs_stream_reset_connect(transport);
1238 mutex_unlock(&transport->recv_mutex);
1239
1240 trace_rpc_socket_close(xprt, sock);
1241 __fput_sync(filp);
1242
1243 xprt_disconnect_done(xprt);
1244 }
1245
1246 /**
1247 * xs_close - close a socket
1248 * @xprt: transport
1249 *
1250 * This is used when all requests are complete; ie, no DRC state remains
1251 * on the server we want to save.
1252 *
1253 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1254 * xs_reset_transport() zeroing the socket from underneath a writer.
1255 */
xs_close(struct rpc_xprt * xprt)1256 static void xs_close(struct rpc_xprt *xprt)
1257 {
1258 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1259
1260 dprintk("RPC: xs_close xprt %p\n", xprt);
1261
1262 xs_reset_transport(transport);
1263 xprt->reestablish_timeout = 0;
1264 }
1265
xs_inject_disconnect(struct rpc_xprt * xprt)1266 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1267 {
1268 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1269 xprt);
1270 xprt_disconnect_done(xprt);
1271 }
1272
xs_xprt_free(struct rpc_xprt * xprt)1273 static void xs_xprt_free(struct rpc_xprt *xprt)
1274 {
1275 xs_free_peer_addresses(xprt);
1276 xprt_free(xprt);
1277 }
1278
1279 /**
1280 * xs_destroy - prepare to shutdown a transport
1281 * @xprt: doomed transport
1282 *
1283 */
xs_destroy(struct rpc_xprt * xprt)1284 static void xs_destroy(struct rpc_xprt *xprt)
1285 {
1286 struct sock_xprt *transport = container_of(xprt,
1287 struct sock_xprt, xprt);
1288 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1289
1290 cancel_delayed_work_sync(&transport->connect_worker);
1291 xs_close(xprt);
1292 cancel_work_sync(&transport->recv_worker);
1293 cancel_work_sync(&transport->error_worker);
1294 xs_xprt_free(xprt);
1295 module_put(THIS_MODULE);
1296 }
1297
1298 /**
1299 * xs_udp_data_read_skb - receive callback for UDP sockets
1300 * @xprt: transport
1301 * @sk: socket
1302 * @skb: skbuff
1303 *
1304 */
xs_udp_data_read_skb(struct rpc_xprt * xprt,struct sock * sk,struct sk_buff * skb)1305 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1306 struct sock *sk,
1307 struct sk_buff *skb)
1308 {
1309 struct rpc_task *task;
1310 struct rpc_rqst *rovr;
1311 int repsize, copied;
1312 u32 _xid;
1313 __be32 *xp;
1314
1315 repsize = skb->len;
1316 if (repsize < 4) {
1317 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1318 return;
1319 }
1320
1321 /* Copy the XID from the skb... */
1322 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1323 if (xp == NULL)
1324 return;
1325
1326 /* Look up and lock the request corresponding to the given XID */
1327 spin_lock(&xprt->queue_lock);
1328 rovr = xprt_lookup_rqst(xprt, *xp);
1329 if (!rovr)
1330 goto out_unlock;
1331 xprt_pin_rqst(rovr);
1332 xprt_update_rtt(rovr->rq_task);
1333 spin_unlock(&xprt->queue_lock);
1334 task = rovr->rq_task;
1335
1336 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1337 copied = repsize;
1338
1339 /* Suck it into the iovec, verify checksum if not done by hw. */
1340 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1341 spin_lock(&xprt->queue_lock);
1342 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1343 goto out_unpin;
1344 }
1345
1346
1347 spin_lock(&xprt->transport_lock);
1348 xprt_adjust_cwnd(xprt, task, copied);
1349 spin_unlock(&xprt->transport_lock);
1350 spin_lock(&xprt->queue_lock);
1351 xprt_complete_rqst(task, copied);
1352 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1353 out_unpin:
1354 xprt_unpin_rqst(rovr);
1355 out_unlock:
1356 spin_unlock(&xprt->queue_lock);
1357 }
1358
xs_udp_data_receive(struct sock_xprt * transport)1359 static void xs_udp_data_receive(struct sock_xprt *transport)
1360 {
1361 struct sk_buff *skb;
1362 struct sock *sk;
1363 int err;
1364
1365 mutex_lock(&transport->recv_mutex);
1366 sk = transport->inet;
1367 if (sk == NULL)
1368 goto out;
1369 for (;;) {
1370 skb = skb_recv_udp(sk, 0, 1, &err);
1371 if (skb == NULL)
1372 break;
1373 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1374 consume_skb(skb);
1375 cond_resched();
1376 }
1377 xs_poll_check_readable(transport);
1378 out:
1379 mutex_unlock(&transport->recv_mutex);
1380 }
1381
xs_udp_data_receive_workfn(struct work_struct * work)1382 static void xs_udp_data_receive_workfn(struct work_struct *work)
1383 {
1384 struct sock_xprt *transport =
1385 container_of(work, struct sock_xprt, recv_worker);
1386 unsigned int pflags = memalloc_nofs_save();
1387
1388 xs_udp_data_receive(transport);
1389 memalloc_nofs_restore(pflags);
1390 }
1391
1392 /**
1393 * xs_data_ready - "data ready" callback for UDP sockets
1394 * @sk: socket with data to read
1395 *
1396 */
xs_data_ready(struct sock * sk)1397 static void xs_data_ready(struct sock *sk)
1398 {
1399 struct rpc_xprt *xprt;
1400
1401 read_lock_bh(&sk->sk_callback_lock);
1402 dprintk("RPC: xs_data_ready...\n");
1403 xprt = xprt_from_sock(sk);
1404 if (xprt != NULL) {
1405 struct sock_xprt *transport = container_of(xprt,
1406 struct sock_xprt, xprt);
1407 transport->old_data_ready(sk);
1408 /* Any data means we had a useful conversation, so
1409 * then we don't need to delay the next reconnect
1410 */
1411 if (xprt->reestablish_timeout)
1412 xprt->reestablish_timeout = 0;
1413 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1414 queue_work(xprtiod_workqueue, &transport->recv_worker);
1415 }
1416 read_unlock_bh(&sk->sk_callback_lock);
1417 }
1418
1419 /*
1420 * Helper function to force a TCP close if the server is sending
1421 * junk and/or it has put us in CLOSE_WAIT
1422 */
xs_tcp_force_close(struct rpc_xprt * xprt)1423 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1424 {
1425 xprt_force_disconnect(xprt);
1426 }
1427
1428 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
xs_tcp_bc_maxpayload(struct rpc_xprt * xprt)1429 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1430 {
1431 return PAGE_SIZE;
1432 }
1433 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1434
1435 /**
1436 * xs_tcp_state_change - callback to handle TCP socket state changes
1437 * @sk: socket whose state has changed
1438 *
1439 */
xs_tcp_state_change(struct sock * sk)1440 static void xs_tcp_state_change(struct sock *sk)
1441 {
1442 struct rpc_xprt *xprt;
1443 struct sock_xprt *transport;
1444
1445 read_lock_bh(&sk->sk_callback_lock);
1446 if (!(xprt = xprt_from_sock(sk)))
1447 goto out;
1448 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1449 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1450 sk->sk_state, xprt_connected(xprt),
1451 sock_flag(sk, SOCK_DEAD),
1452 sock_flag(sk, SOCK_ZAPPED),
1453 sk->sk_shutdown);
1454
1455 transport = container_of(xprt, struct sock_xprt, xprt);
1456 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1457 switch (sk->sk_state) {
1458 case TCP_ESTABLISHED:
1459 if (!xprt_test_and_set_connected(xprt)) {
1460 xprt->connect_cookie++;
1461 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1462 xprt_clear_connecting(xprt);
1463
1464 xprt->stat.connect_count++;
1465 xprt->stat.connect_time += (long)jiffies -
1466 xprt->stat.connect_start;
1467 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1468 }
1469 break;
1470 case TCP_FIN_WAIT1:
1471 /* The client initiated a shutdown of the socket */
1472 xprt->connect_cookie++;
1473 xprt->reestablish_timeout = 0;
1474 set_bit(XPRT_CLOSING, &xprt->state);
1475 smp_mb__before_atomic();
1476 clear_bit(XPRT_CONNECTED, &xprt->state);
1477 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1478 smp_mb__after_atomic();
1479 break;
1480 case TCP_CLOSE_WAIT:
1481 /* The server initiated a shutdown of the socket */
1482 xprt->connect_cookie++;
1483 clear_bit(XPRT_CONNECTED, &xprt->state);
1484 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1485 fallthrough;
1486 case TCP_CLOSING:
1487 /*
1488 * If the server closed down the connection, make sure that
1489 * we back off before reconnecting
1490 */
1491 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1492 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1493 break;
1494 case TCP_LAST_ACK:
1495 set_bit(XPRT_CLOSING, &xprt->state);
1496 smp_mb__before_atomic();
1497 clear_bit(XPRT_CONNECTED, &xprt->state);
1498 smp_mb__after_atomic();
1499 break;
1500 case TCP_CLOSE:
1501 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1502 &transport->sock_state))
1503 xprt_clear_connecting(xprt);
1504 clear_bit(XPRT_CLOSING, &xprt->state);
1505 /* Trigger the socket release */
1506 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1507 }
1508 out:
1509 read_unlock_bh(&sk->sk_callback_lock);
1510 }
1511
xs_write_space(struct sock * sk)1512 static void xs_write_space(struct sock *sk)
1513 {
1514 struct socket_wq *wq;
1515 struct sock_xprt *transport;
1516 struct rpc_xprt *xprt;
1517
1518 if (!sk->sk_socket)
1519 return;
1520 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1521
1522 if (unlikely(!(xprt = xprt_from_sock(sk))))
1523 return;
1524 transport = container_of(xprt, struct sock_xprt, xprt);
1525 rcu_read_lock();
1526 wq = rcu_dereference(sk->sk_wq);
1527 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1528 goto out;
1529
1530 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1531 sk->sk_write_pending--;
1532 out:
1533 rcu_read_unlock();
1534 }
1535
1536 /**
1537 * xs_udp_write_space - callback invoked when socket buffer space
1538 * becomes available
1539 * @sk: socket whose state has changed
1540 *
1541 * Called when more output buffer space is available for this socket.
1542 * We try not to wake our writers until they can make "significant"
1543 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1544 * with a bunch of small requests.
1545 */
xs_udp_write_space(struct sock * sk)1546 static void xs_udp_write_space(struct sock *sk)
1547 {
1548 read_lock_bh(&sk->sk_callback_lock);
1549
1550 /* from net/core/sock.c:sock_def_write_space */
1551 if (sock_writeable(sk))
1552 xs_write_space(sk);
1553
1554 read_unlock_bh(&sk->sk_callback_lock);
1555 }
1556
1557 /**
1558 * xs_tcp_write_space - callback invoked when socket buffer space
1559 * becomes available
1560 * @sk: socket whose state has changed
1561 *
1562 * Called when more output buffer space is available for this socket.
1563 * We try not to wake our writers until they can make "significant"
1564 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1565 * with a bunch of small requests.
1566 */
xs_tcp_write_space(struct sock * sk)1567 static void xs_tcp_write_space(struct sock *sk)
1568 {
1569 read_lock_bh(&sk->sk_callback_lock);
1570
1571 /* from net/core/stream.c:sk_stream_write_space */
1572 if (sk_stream_is_writeable(sk))
1573 xs_write_space(sk);
1574
1575 read_unlock_bh(&sk->sk_callback_lock);
1576 }
1577
xs_udp_do_set_buffer_size(struct rpc_xprt * xprt)1578 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1579 {
1580 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1581 struct sock *sk = transport->inet;
1582
1583 if (transport->rcvsize) {
1584 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1585 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1586 }
1587 if (transport->sndsize) {
1588 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1589 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1590 sk->sk_write_space(sk);
1591 }
1592 }
1593
1594 /**
1595 * xs_udp_set_buffer_size - set send and receive limits
1596 * @xprt: generic transport
1597 * @sndsize: requested size of send buffer, in bytes
1598 * @rcvsize: requested size of receive buffer, in bytes
1599 *
1600 * Set socket send and receive buffer size limits.
1601 */
xs_udp_set_buffer_size(struct rpc_xprt * xprt,size_t sndsize,size_t rcvsize)1602 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1603 {
1604 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1605
1606 transport->sndsize = 0;
1607 if (sndsize)
1608 transport->sndsize = sndsize + 1024;
1609 transport->rcvsize = 0;
1610 if (rcvsize)
1611 transport->rcvsize = rcvsize + 1024;
1612
1613 xs_udp_do_set_buffer_size(xprt);
1614 }
1615
1616 /**
1617 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1618 * @xprt: controlling transport
1619 * @task: task that timed out
1620 *
1621 * Adjust the congestion window after a retransmit timeout has occurred.
1622 */
xs_udp_timer(struct rpc_xprt * xprt,struct rpc_task * task)1623 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1624 {
1625 spin_lock(&xprt->transport_lock);
1626 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1627 spin_unlock(&xprt->transport_lock);
1628 }
1629
xs_get_random_port(void)1630 static int xs_get_random_port(void)
1631 {
1632 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1633 unsigned short range;
1634 unsigned short rand;
1635
1636 if (max < min)
1637 return -EADDRINUSE;
1638 range = max - min + 1;
1639 rand = (unsigned short) prandom_u32() % range;
1640 return rand + min;
1641 }
1642
xs_sock_getport(struct socket * sock)1643 static unsigned short xs_sock_getport(struct socket *sock)
1644 {
1645 struct sockaddr_storage buf;
1646 unsigned short port = 0;
1647
1648 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1649 goto out;
1650 switch (buf.ss_family) {
1651 case AF_INET6:
1652 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1653 break;
1654 case AF_INET:
1655 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1656 }
1657 out:
1658 return port;
1659 }
1660
1661 /**
1662 * xs_set_port - reset the port number in the remote endpoint address
1663 * @xprt: generic transport
1664 * @port: new port number
1665 *
1666 */
xs_set_port(struct rpc_xprt * xprt,unsigned short port)1667 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1668 {
1669 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1670
1671 rpc_set_port(xs_addr(xprt), port);
1672 xs_update_peer_port(xprt);
1673 }
1674
xs_set_srcport(struct sock_xprt * transport,struct socket * sock)1675 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1676 {
1677 if (transport->srcport == 0 && transport->xprt.reuseport)
1678 transport->srcport = xs_sock_getport(sock);
1679 }
1680
xs_get_srcport(struct sock_xprt * transport)1681 static int xs_get_srcport(struct sock_xprt *transport)
1682 {
1683 int port = transport->srcport;
1684
1685 if (port == 0 && transport->xprt.resvport)
1686 port = xs_get_random_port();
1687 return port;
1688 }
1689
get_srcport(struct rpc_xprt * xprt)1690 unsigned short get_srcport(struct rpc_xprt *xprt)
1691 {
1692 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1693 return xs_sock_getport(sock->sock);
1694 }
1695 EXPORT_SYMBOL(get_srcport);
1696
xs_next_srcport(struct sock_xprt * transport,unsigned short port)1697 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1698 {
1699 if (transport->srcport != 0)
1700 transport->srcport = 0;
1701 if (!transport->xprt.resvport)
1702 return 0;
1703 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1704 return xprt_max_resvport;
1705 return --port;
1706 }
xs_bind(struct sock_xprt * transport,struct socket * sock)1707 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1708 {
1709 struct sockaddr_storage myaddr;
1710 int err, nloop = 0;
1711 int port = xs_get_srcport(transport);
1712 unsigned short last;
1713
1714 /*
1715 * If we are asking for any ephemeral port (i.e. port == 0 &&
1716 * transport->xprt.resvport == 0), don't bind. Let the local
1717 * port selection happen implicitly when the socket is used
1718 * (for example at connect time).
1719 *
1720 * This ensures that we can continue to establish TCP
1721 * connections even when all local ephemeral ports are already
1722 * a part of some TCP connection. This makes no difference
1723 * for UDP sockets, but also doesn't harm them.
1724 *
1725 * If we're asking for any reserved port (i.e. port == 0 &&
1726 * transport->xprt.resvport == 1) xs_get_srcport above will
1727 * ensure that port is non-zero and we will bind as needed.
1728 */
1729 if (port <= 0)
1730 return port;
1731
1732 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1733 do {
1734 rpc_set_port((struct sockaddr *)&myaddr, port);
1735 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1736 transport->xprt.addrlen);
1737 if (err == 0) {
1738 if (transport->xprt.reuseport)
1739 transport->srcport = port;
1740 break;
1741 }
1742 last = port;
1743 port = xs_next_srcport(transport, port);
1744 if (port > last)
1745 nloop++;
1746 } while (err == -EADDRINUSE && nloop != 2);
1747
1748 if (myaddr.ss_family == AF_INET)
1749 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1750 &((struct sockaddr_in *)&myaddr)->sin_addr,
1751 port, err ? "failed" : "ok", err);
1752 else
1753 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1754 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1755 port, err ? "failed" : "ok", err);
1756 return err;
1757 }
1758
1759 /*
1760 * We don't support autobind on AF_LOCAL sockets
1761 */
xs_local_rpcbind(struct rpc_task * task)1762 static void xs_local_rpcbind(struct rpc_task *task)
1763 {
1764 xprt_set_bound(task->tk_xprt);
1765 }
1766
xs_local_set_port(struct rpc_xprt * xprt,unsigned short port)1767 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1768 {
1769 }
1770
1771 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1772 static struct lock_class_key xs_key[2];
1773 static struct lock_class_key xs_slock_key[2];
1774
xs_reclassify_socketu(struct socket * sock)1775 static inline void xs_reclassify_socketu(struct socket *sock)
1776 {
1777 struct sock *sk = sock->sk;
1778
1779 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1780 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1781 }
1782
xs_reclassify_socket4(struct socket * sock)1783 static inline void xs_reclassify_socket4(struct socket *sock)
1784 {
1785 struct sock *sk = sock->sk;
1786
1787 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1788 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1789 }
1790
xs_reclassify_socket6(struct socket * sock)1791 static inline void xs_reclassify_socket6(struct socket *sock)
1792 {
1793 struct sock *sk = sock->sk;
1794
1795 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1796 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1797 }
1798
xs_reclassify_socket(int family,struct socket * sock)1799 static inline void xs_reclassify_socket(int family, struct socket *sock)
1800 {
1801 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1802 return;
1803
1804 switch (family) {
1805 case AF_LOCAL:
1806 xs_reclassify_socketu(sock);
1807 break;
1808 case AF_INET:
1809 xs_reclassify_socket4(sock);
1810 break;
1811 case AF_INET6:
1812 xs_reclassify_socket6(sock);
1813 break;
1814 }
1815 }
1816 #else
xs_reclassify_socket(int family,struct socket * sock)1817 static inline void xs_reclassify_socket(int family, struct socket *sock)
1818 {
1819 }
1820 #endif
1821
xs_dummy_setup_socket(struct work_struct * work)1822 static void xs_dummy_setup_socket(struct work_struct *work)
1823 {
1824 }
1825
xs_create_sock(struct rpc_xprt * xprt,struct sock_xprt * transport,int family,int type,int protocol,bool reuseport)1826 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1827 struct sock_xprt *transport, int family, int type,
1828 int protocol, bool reuseport)
1829 {
1830 struct file *filp;
1831 struct socket *sock;
1832 int err;
1833
1834 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1835 if (err < 0) {
1836 dprintk("RPC: can't create %d transport socket (%d).\n",
1837 protocol, -err);
1838 goto out;
1839 }
1840 xs_reclassify_socket(family, sock);
1841
1842 if (reuseport)
1843 sock_set_reuseport(sock->sk);
1844
1845 err = xs_bind(transport, sock);
1846 if (err) {
1847 sock_release(sock);
1848 goto out;
1849 }
1850
1851 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1852 if (IS_ERR(filp))
1853 return ERR_CAST(filp);
1854 transport->file = filp;
1855
1856 return sock;
1857 out:
1858 return ERR_PTR(err);
1859 }
1860
xs_local_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)1861 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1862 struct socket *sock)
1863 {
1864 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1865 xprt);
1866
1867 if (!transport->inet) {
1868 struct sock *sk = sock->sk;
1869
1870 write_lock_bh(&sk->sk_callback_lock);
1871
1872 xs_save_old_callbacks(transport, sk);
1873
1874 sk->sk_user_data = xprt;
1875 sk->sk_data_ready = xs_data_ready;
1876 sk->sk_write_space = xs_udp_write_space;
1877 sock_set_flag(sk, SOCK_FASYNC);
1878 sk->sk_error_report = xs_error_report;
1879
1880 xprt_clear_connected(xprt);
1881
1882 /* Reset to new socket */
1883 transport->sock = sock;
1884 transport->inet = sk;
1885
1886 write_unlock_bh(&sk->sk_callback_lock);
1887 }
1888
1889 xs_stream_start_connect(transport);
1890
1891 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1892 }
1893
1894 /**
1895 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1896 * @transport: socket transport to connect
1897 */
xs_local_setup_socket(struct sock_xprt * transport)1898 static int xs_local_setup_socket(struct sock_xprt *transport)
1899 {
1900 struct rpc_xprt *xprt = &transport->xprt;
1901 struct file *filp;
1902 struct socket *sock;
1903 int status;
1904
1905 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1906 SOCK_STREAM, 0, &sock, 1);
1907 if (status < 0) {
1908 dprintk("RPC: can't create AF_LOCAL "
1909 "transport socket (%d).\n", -status);
1910 goto out;
1911 }
1912 xs_reclassify_socket(AF_LOCAL, sock);
1913
1914 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1915 if (IS_ERR(filp)) {
1916 status = PTR_ERR(filp);
1917 goto out;
1918 }
1919 transport->file = filp;
1920
1921 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1922 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1923
1924 status = xs_local_finish_connecting(xprt, sock);
1925 trace_rpc_socket_connect(xprt, sock, status);
1926 switch (status) {
1927 case 0:
1928 dprintk("RPC: xprt %p connected to %s\n",
1929 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1930 xprt->stat.connect_count++;
1931 xprt->stat.connect_time += (long)jiffies -
1932 xprt->stat.connect_start;
1933 xprt_set_connected(xprt);
1934 break;
1935 case -ENOBUFS:
1936 break;
1937 case -ENOENT:
1938 dprintk("RPC: xprt %p: socket %s does not exist\n",
1939 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1940 break;
1941 case -ECONNREFUSED:
1942 dprintk("RPC: xprt %p: connection refused for %s\n",
1943 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1944 break;
1945 default:
1946 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1947 __func__, -status,
1948 xprt->address_strings[RPC_DISPLAY_ADDR]);
1949 }
1950
1951 out:
1952 xprt_clear_connecting(xprt);
1953 xprt_wake_pending_tasks(xprt, status);
1954 return status;
1955 }
1956
xs_local_connect(struct rpc_xprt * xprt,struct rpc_task * task)1957 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1958 {
1959 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1960 int ret;
1961
1962 if (RPC_IS_ASYNC(task)) {
1963 /*
1964 * We want the AF_LOCAL connect to be resolved in the
1965 * filesystem namespace of the process making the rpc
1966 * call. Thus we connect synchronously.
1967 *
1968 * If we want to support asynchronous AF_LOCAL calls,
1969 * we'll need to figure out how to pass a namespace to
1970 * connect.
1971 */
1972 task->tk_rpc_status = -ENOTCONN;
1973 rpc_exit(task, -ENOTCONN);
1974 return;
1975 }
1976 ret = xs_local_setup_socket(transport);
1977 if (ret && !RPC_IS_SOFTCONN(task))
1978 msleep_interruptible(15000);
1979 }
1980
1981 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1982 /*
1983 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1984 * know that we have exclusive access to the socket), to guard against
1985 * races with xs_reset_transport.
1986 */
xs_set_memalloc(struct rpc_xprt * xprt)1987 static void xs_set_memalloc(struct rpc_xprt *xprt)
1988 {
1989 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1990 xprt);
1991
1992 /*
1993 * If there's no sock, then we have nothing to set. The
1994 * reconnecting process will get it for us.
1995 */
1996 if (!transport->inet)
1997 return;
1998 if (atomic_read(&xprt->swapper))
1999 sk_set_memalloc(transport->inet);
2000 }
2001
2002 /**
2003 * xs_enable_swap - Tag this transport as being used for swap.
2004 * @xprt: transport to tag
2005 *
2006 * Take a reference to this transport on behalf of the rpc_clnt, and
2007 * optionally mark it for swapping if it wasn't already.
2008 */
2009 static int
xs_enable_swap(struct rpc_xprt * xprt)2010 xs_enable_swap(struct rpc_xprt *xprt)
2011 {
2012 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2013
2014 if (atomic_inc_return(&xprt->swapper) != 1)
2015 return 0;
2016 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2017 return -ERESTARTSYS;
2018 if (xs->inet)
2019 sk_set_memalloc(xs->inet);
2020 xprt_release_xprt(xprt, NULL);
2021 return 0;
2022 }
2023
2024 /**
2025 * xs_disable_swap - Untag this transport as being used for swap.
2026 * @xprt: transport to tag
2027 *
2028 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2029 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2030 */
2031 static void
xs_disable_swap(struct rpc_xprt * xprt)2032 xs_disable_swap(struct rpc_xprt *xprt)
2033 {
2034 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2035
2036 if (!atomic_dec_and_test(&xprt->swapper))
2037 return;
2038 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2039 return;
2040 if (xs->inet)
2041 sk_clear_memalloc(xs->inet);
2042 xprt_release_xprt(xprt, NULL);
2043 }
2044 #else
xs_set_memalloc(struct rpc_xprt * xprt)2045 static void xs_set_memalloc(struct rpc_xprt *xprt)
2046 {
2047 }
2048
2049 static int
xs_enable_swap(struct rpc_xprt * xprt)2050 xs_enable_swap(struct rpc_xprt *xprt)
2051 {
2052 return -EINVAL;
2053 }
2054
2055 static void
xs_disable_swap(struct rpc_xprt * xprt)2056 xs_disable_swap(struct rpc_xprt *xprt)
2057 {
2058 }
2059 #endif
2060
xs_udp_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)2061 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2062 {
2063 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2064
2065 if (!transport->inet) {
2066 struct sock *sk = sock->sk;
2067
2068 write_lock_bh(&sk->sk_callback_lock);
2069
2070 xs_save_old_callbacks(transport, sk);
2071
2072 sk->sk_user_data = xprt;
2073 sk->sk_data_ready = xs_data_ready;
2074 sk->sk_write_space = xs_udp_write_space;
2075 sock_set_flag(sk, SOCK_FASYNC);
2076
2077 xprt_set_connected(xprt);
2078
2079 /* Reset to new socket */
2080 transport->sock = sock;
2081 transport->inet = sk;
2082
2083 xs_set_memalloc(xprt);
2084
2085 write_unlock_bh(&sk->sk_callback_lock);
2086 }
2087 xs_udp_do_set_buffer_size(xprt);
2088
2089 xprt->stat.connect_start = jiffies;
2090 }
2091
xs_udp_setup_socket(struct work_struct * work)2092 static void xs_udp_setup_socket(struct work_struct *work)
2093 {
2094 struct sock_xprt *transport =
2095 container_of(work, struct sock_xprt, connect_worker.work);
2096 struct rpc_xprt *xprt = &transport->xprt;
2097 struct socket *sock;
2098 int status = -EIO;
2099
2100 sock = xs_create_sock(xprt, transport,
2101 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2102 IPPROTO_UDP, false);
2103 if (IS_ERR(sock))
2104 goto out;
2105
2106 dprintk("RPC: worker connecting xprt %p via %s to "
2107 "%s (port %s)\n", xprt,
2108 xprt->address_strings[RPC_DISPLAY_PROTO],
2109 xprt->address_strings[RPC_DISPLAY_ADDR],
2110 xprt->address_strings[RPC_DISPLAY_PORT]);
2111
2112 xs_udp_finish_connecting(xprt, sock);
2113 trace_rpc_socket_connect(xprt, sock, 0);
2114 status = 0;
2115 out:
2116 xprt_clear_connecting(xprt);
2117 xprt_unlock_connect(xprt, transport);
2118 xprt_wake_pending_tasks(xprt, status);
2119 }
2120
2121 /**
2122 * xs_tcp_shutdown - gracefully shut down a TCP socket
2123 * @xprt: transport
2124 *
2125 * Initiates a graceful shutdown of the TCP socket by calling the
2126 * equivalent of shutdown(SHUT_RDWR);
2127 */
xs_tcp_shutdown(struct rpc_xprt * xprt)2128 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2129 {
2130 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2131 struct socket *sock = transport->sock;
2132 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2133
2134 if (sock == NULL)
2135 return;
2136 if (!xprt->reuseport) {
2137 xs_close(xprt);
2138 return;
2139 }
2140 switch (skst) {
2141 case TCP_FIN_WAIT1:
2142 case TCP_FIN_WAIT2:
2143 case TCP_LAST_ACK:
2144 break;
2145 case TCP_ESTABLISHED:
2146 case TCP_CLOSE_WAIT:
2147 kernel_sock_shutdown(sock, SHUT_RDWR);
2148 trace_rpc_socket_shutdown(xprt, sock);
2149 break;
2150 default:
2151 xs_reset_transport(transport);
2152 }
2153 }
2154
xs_tcp_set_socket_timeouts(struct rpc_xprt * xprt,struct socket * sock)2155 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2156 struct socket *sock)
2157 {
2158 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2159 unsigned int keepidle;
2160 unsigned int keepcnt;
2161 unsigned int timeo;
2162
2163 spin_lock(&xprt->transport_lock);
2164 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2165 keepcnt = xprt->timeout->to_retries + 1;
2166 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2167 (xprt->timeout->to_retries + 1);
2168 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2169 spin_unlock(&xprt->transport_lock);
2170
2171 /* TCP Keepalive options */
2172 sock_set_keepalive(sock->sk);
2173 tcp_sock_set_keepidle(sock->sk, keepidle);
2174 tcp_sock_set_keepintvl(sock->sk, keepidle);
2175 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2176
2177 /* TCP user timeout (see RFC5482) */
2178 tcp_sock_set_user_timeout(sock->sk, timeo);
2179 }
2180
xs_tcp_set_connect_timeout(struct rpc_xprt * xprt,unsigned long connect_timeout,unsigned long reconnect_timeout)2181 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2182 unsigned long connect_timeout,
2183 unsigned long reconnect_timeout)
2184 {
2185 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2186 struct rpc_timeout to;
2187 unsigned long initval;
2188
2189 spin_lock(&xprt->transport_lock);
2190 if (reconnect_timeout < xprt->max_reconnect_timeout)
2191 xprt->max_reconnect_timeout = reconnect_timeout;
2192 if (connect_timeout < xprt->connect_timeout) {
2193 memcpy(&to, xprt->timeout, sizeof(to));
2194 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2195 /* Arbitrary lower limit */
2196 if (initval < XS_TCP_INIT_REEST_TO << 1)
2197 initval = XS_TCP_INIT_REEST_TO << 1;
2198 to.to_initval = initval;
2199 to.to_maxval = initval;
2200 memcpy(&transport->tcp_timeout, &to,
2201 sizeof(transport->tcp_timeout));
2202 xprt->timeout = &transport->tcp_timeout;
2203 xprt->connect_timeout = connect_timeout;
2204 }
2205 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2206 spin_unlock(&xprt->transport_lock);
2207 }
2208
xs_tcp_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)2209 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2210 {
2211 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2212 int ret = -ENOTCONN;
2213
2214 if (!transport->inet) {
2215 struct sock *sk = sock->sk;
2216
2217 /* Avoid temporary address, they are bad for long-lived
2218 * connections such as NFS mounts.
2219 * RFC4941, section 3.6 suggests that:
2220 * Individual applications, which have specific
2221 * knowledge about the normal duration of connections,
2222 * MAY override this as appropriate.
2223 */
2224 if (xs_addr(xprt)->sa_family == PF_INET6) {
2225 ip6_sock_set_addr_preferences(sk,
2226 IPV6_PREFER_SRC_PUBLIC);
2227 }
2228
2229 xs_tcp_set_socket_timeouts(xprt, sock);
2230 tcp_sock_set_nodelay(sk);
2231
2232 write_lock_bh(&sk->sk_callback_lock);
2233
2234 xs_save_old_callbacks(transport, sk);
2235
2236 sk->sk_user_data = xprt;
2237 sk->sk_data_ready = xs_data_ready;
2238 sk->sk_state_change = xs_tcp_state_change;
2239 sk->sk_write_space = xs_tcp_write_space;
2240 sock_set_flag(sk, SOCK_FASYNC);
2241 sk->sk_error_report = xs_error_report;
2242
2243 /* socket options */
2244 sock_reset_flag(sk, SOCK_LINGER);
2245
2246 xprt_clear_connected(xprt);
2247
2248 /* Reset to new socket */
2249 transport->sock = sock;
2250 transport->inet = sk;
2251
2252 write_unlock_bh(&sk->sk_callback_lock);
2253 }
2254
2255 if (!xprt_bound(xprt))
2256 goto out;
2257
2258 xs_set_memalloc(xprt);
2259
2260 xs_stream_start_connect(transport);
2261
2262 /* Tell the socket layer to start connecting... */
2263 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2264 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2265 switch (ret) {
2266 case 0:
2267 xs_set_srcport(transport, sock);
2268 fallthrough;
2269 case -EINPROGRESS:
2270 /* SYN_SENT! */
2271 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2272 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2273 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2274 break;
2275 case -EADDRNOTAVAIL:
2276 /* Source port number is unavailable. Try a new one! */
2277 transport->srcport = 0;
2278 }
2279 out:
2280 return ret;
2281 }
2282
2283 /**
2284 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2285 * @work: queued work item
2286 *
2287 * Invoked by a work queue tasklet.
2288 */
xs_tcp_setup_socket(struct work_struct * work)2289 static void xs_tcp_setup_socket(struct work_struct *work)
2290 {
2291 struct sock_xprt *transport =
2292 container_of(work, struct sock_xprt, connect_worker.work);
2293 struct socket *sock = transport->sock;
2294 struct rpc_xprt *xprt = &transport->xprt;
2295 int status = -EIO;
2296
2297 if (xprt_connected(xprt))
2298 goto out;
2299 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2300 &transport->sock_state) ||
2301 !sock) {
2302 xs_reset_transport(transport);
2303 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2304 SOCK_STREAM, IPPROTO_TCP, true);
2305 if (IS_ERR(sock)) {
2306 status = PTR_ERR(sock);
2307 goto out;
2308 }
2309 }
2310
2311 dprintk("RPC: worker connecting xprt %p via %s to "
2312 "%s (port %s)\n", xprt,
2313 xprt->address_strings[RPC_DISPLAY_PROTO],
2314 xprt->address_strings[RPC_DISPLAY_ADDR],
2315 xprt->address_strings[RPC_DISPLAY_PORT]);
2316
2317 status = xs_tcp_finish_connecting(xprt, sock);
2318 trace_rpc_socket_connect(xprt, sock, status);
2319 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2320 xprt, -status, xprt_connected(xprt),
2321 sock->sk->sk_state);
2322 switch (status) {
2323 default:
2324 printk("%s: connect returned unhandled error %d\n",
2325 __func__, status);
2326 fallthrough;
2327 case -EADDRNOTAVAIL:
2328 /* We're probably in TIME_WAIT. Get rid of existing socket,
2329 * and retry
2330 */
2331 xs_tcp_force_close(xprt);
2332 break;
2333 case 0:
2334 case -EINPROGRESS:
2335 case -EALREADY:
2336 xprt_unlock_connect(xprt, transport);
2337 return;
2338 case -EINVAL:
2339 /* Happens, for instance, if the user specified a link
2340 * local IPv6 address without a scope-id.
2341 */
2342 case -ECONNREFUSED:
2343 case -ECONNRESET:
2344 case -ENETDOWN:
2345 case -ENETUNREACH:
2346 case -EHOSTUNREACH:
2347 case -EADDRINUSE:
2348 case -ENOBUFS:
2349 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2350 * We need to wake them first to ensure the correct error code.
2351 */
2352 xprt_wake_pending_tasks(xprt, status);
2353 xs_tcp_force_close(xprt);
2354 goto out;
2355 }
2356 status = -EAGAIN;
2357 out:
2358 xprt_clear_connecting(xprt);
2359 xprt_unlock_connect(xprt, transport);
2360 xprt_wake_pending_tasks(xprt, status);
2361 }
2362
2363 /**
2364 * xs_connect - connect a socket to a remote endpoint
2365 * @xprt: pointer to transport structure
2366 * @task: address of RPC task that manages state of connect request
2367 *
2368 * TCP: If the remote end dropped the connection, delay reconnecting.
2369 *
2370 * UDP socket connects are synchronous, but we use a work queue anyway
2371 * to guarantee that even unprivileged user processes can set up a
2372 * socket on a privileged port.
2373 *
2374 * If a UDP socket connect fails, the delay behavior here prevents
2375 * retry floods (hard mounts).
2376 */
xs_connect(struct rpc_xprt * xprt,struct rpc_task * task)2377 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2378 {
2379 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2380 unsigned long delay = 0;
2381
2382 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2383
2384 if (transport->sock != NULL) {
2385 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2386 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2387
2388 delay = xprt_reconnect_delay(xprt);
2389 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2390
2391 } else
2392 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2393
2394 queue_delayed_work(xprtiod_workqueue,
2395 &transport->connect_worker,
2396 delay);
2397 }
2398
xs_wake_disconnect(struct sock_xprt * transport)2399 static void xs_wake_disconnect(struct sock_xprt *transport)
2400 {
2401 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2402 xs_tcp_force_close(&transport->xprt);
2403 }
2404
xs_wake_write(struct sock_xprt * transport)2405 static void xs_wake_write(struct sock_xprt *transport)
2406 {
2407 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2408 xprt_write_space(&transport->xprt);
2409 }
2410
xs_wake_error(struct sock_xprt * transport)2411 static void xs_wake_error(struct sock_xprt *transport)
2412 {
2413 int sockerr;
2414
2415 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2416 return;
2417 mutex_lock(&transport->recv_mutex);
2418 if (transport->sock == NULL)
2419 goto out;
2420 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2421 goto out;
2422 sockerr = xchg(&transport->xprt_err, 0);
2423 if (sockerr < 0)
2424 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2425 out:
2426 mutex_unlock(&transport->recv_mutex);
2427 }
2428
xs_wake_pending(struct sock_xprt * transport)2429 static void xs_wake_pending(struct sock_xprt *transport)
2430 {
2431 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2432 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2433 }
2434
xs_error_handle(struct work_struct * work)2435 static void xs_error_handle(struct work_struct *work)
2436 {
2437 struct sock_xprt *transport = container_of(work,
2438 struct sock_xprt, error_worker);
2439
2440 xs_wake_disconnect(transport);
2441 xs_wake_write(transport);
2442 xs_wake_error(transport);
2443 xs_wake_pending(transport);
2444 }
2445
2446 /**
2447 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2448 * @xprt: rpc_xprt struct containing statistics
2449 * @seq: output file
2450 *
2451 */
xs_local_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2452 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2453 {
2454 long idle_time = 0;
2455
2456 if (xprt_connected(xprt))
2457 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2458
2459 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2460 "%llu %llu %lu %llu %llu\n",
2461 xprt->stat.bind_count,
2462 xprt->stat.connect_count,
2463 xprt->stat.connect_time / HZ,
2464 idle_time,
2465 xprt->stat.sends,
2466 xprt->stat.recvs,
2467 xprt->stat.bad_xids,
2468 xprt->stat.req_u,
2469 xprt->stat.bklog_u,
2470 xprt->stat.max_slots,
2471 xprt->stat.sending_u,
2472 xprt->stat.pending_u);
2473 }
2474
2475 /**
2476 * xs_udp_print_stats - display UDP socket-specific stats
2477 * @xprt: rpc_xprt struct containing statistics
2478 * @seq: output file
2479 *
2480 */
xs_udp_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2481 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2482 {
2483 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2484
2485 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2486 "%lu %llu %llu\n",
2487 transport->srcport,
2488 xprt->stat.bind_count,
2489 xprt->stat.sends,
2490 xprt->stat.recvs,
2491 xprt->stat.bad_xids,
2492 xprt->stat.req_u,
2493 xprt->stat.bklog_u,
2494 xprt->stat.max_slots,
2495 xprt->stat.sending_u,
2496 xprt->stat.pending_u);
2497 }
2498
2499 /**
2500 * xs_tcp_print_stats - display TCP socket-specific stats
2501 * @xprt: rpc_xprt struct containing statistics
2502 * @seq: output file
2503 *
2504 */
xs_tcp_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2505 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2506 {
2507 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2508 long idle_time = 0;
2509
2510 if (xprt_connected(xprt))
2511 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2512
2513 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2514 "%llu %llu %lu %llu %llu\n",
2515 transport->srcport,
2516 xprt->stat.bind_count,
2517 xprt->stat.connect_count,
2518 xprt->stat.connect_time / HZ,
2519 idle_time,
2520 xprt->stat.sends,
2521 xprt->stat.recvs,
2522 xprt->stat.bad_xids,
2523 xprt->stat.req_u,
2524 xprt->stat.bklog_u,
2525 xprt->stat.max_slots,
2526 xprt->stat.sending_u,
2527 xprt->stat.pending_u);
2528 }
2529
2530 /*
2531 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2532 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2533 * to use the server side send routines.
2534 */
bc_malloc(struct rpc_task * task)2535 static int bc_malloc(struct rpc_task *task)
2536 {
2537 struct rpc_rqst *rqst = task->tk_rqstp;
2538 size_t size = rqst->rq_callsize;
2539 struct page *page;
2540 struct rpc_buffer *buf;
2541
2542 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2543 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2544 size);
2545 return -EINVAL;
2546 }
2547
2548 page = alloc_page(GFP_KERNEL);
2549 if (!page)
2550 return -ENOMEM;
2551
2552 buf = page_address(page);
2553 buf->len = PAGE_SIZE;
2554
2555 rqst->rq_buffer = buf->data;
2556 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2557 return 0;
2558 }
2559
2560 /*
2561 * Free the space allocated in the bc_alloc routine
2562 */
bc_free(struct rpc_task * task)2563 static void bc_free(struct rpc_task *task)
2564 {
2565 void *buffer = task->tk_rqstp->rq_buffer;
2566 struct rpc_buffer *buf;
2567
2568 buf = container_of(buffer, struct rpc_buffer, data);
2569 free_page((unsigned long)buf);
2570 }
2571
bc_sendto(struct rpc_rqst * req)2572 static int bc_sendto(struct rpc_rqst *req)
2573 {
2574 struct xdr_buf *xdr = &req->rq_snd_buf;
2575 struct sock_xprt *transport =
2576 container_of(req->rq_xprt, struct sock_xprt, xprt);
2577 struct msghdr msg = {
2578 .msg_flags = 0,
2579 };
2580 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2581 (u32)xdr->len);
2582 unsigned int sent = 0;
2583 int err;
2584
2585 req->rq_xtime = ktime_get();
2586 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2587 xdr_free_bvec(xdr);
2588 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2589 return -EAGAIN;
2590 return sent;
2591 }
2592
2593 /**
2594 * bc_send_request - Send a backchannel Call on a TCP socket
2595 * @req: rpc_rqst containing Call message to be sent
2596 *
2597 * xpt_mutex ensures @rqstp's whole message is written to the socket
2598 * without interruption.
2599 *
2600 * Return values:
2601 * %0 if the message was sent successfully
2602 * %ENOTCONN if the message was not sent
2603 */
bc_send_request(struct rpc_rqst * req)2604 static int bc_send_request(struct rpc_rqst *req)
2605 {
2606 struct svc_xprt *xprt;
2607 int len;
2608
2609 /*
2610 * Get the server socket associated with this callback xprt
2611 */
2612 xprt = req->rq_xprt->bc_xprt;
2613
2614 /*
2615 * Grab the mutex to serialize data as the connection is shared
2616 * with the fore channel
2617 */
2618 mutex_lock(&xprt->xpt_mutex);
2619 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2620 len = -ENOTCONN;
2621 else
2622 len = bc_sendto(req);
2623 mutex_unlock(&xprt->xpt_mutex);
2624
2625 if (len > 0)
2626 len = 0;
2627
2628 return len;
2629 }
2630
2631 /*
2632 * The close routine. Since this is client initiated, we do nothing
2633 */
2634
bc_close(struct rpc_xprt * xprt)2635 static void bc_close(struct rpc_xprt *xprt)
2636 {
2637 xprt_disconnect_done(xprt);
2638 }
2639
2640 /*
2641 * The xprt destroy routine. Again, because this connection is client
2642 * initiated, we do nothing
2643 */
2644
bc_destroy(struct rpc_xprt * xprt)2645 static void bc_destroy(struct rpc_xprt *xprt)
2646 {
2647 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2648
2649 xs_xprt_free(xprt);
2650 module_put(THIS_MODULE);
2651 }
2652
2653 static const struct rpc_xprt_ops xs_local_ops = {
2654 .reserve_xprt = xprt_reserve_xprt,
2655 .release_xprt = xprt_release_xprt,
2656 .alloc_slot = xprt_alloc_slot,
2657 .free_slot = xprt_free_slot,
2658 .rpcbind = xs_local_rpcbind,
2659 .set_port = xs_local_set_port,
2660 .connect = xs_local_connect,
2661 .buf_alloc = rpc_malloc,
2662 .buf_free = rpc_free,
2663 .prepare_request = xs_stream_prepare_request,
2664 .send_request = xs_local_send_request,
2665 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2666 .close = xs_close,
2667 .destroy = xs_destroy,
2668 .print_stats = xs_local_print_stats,
2669 .enable_swap = xs_enable_swap,
2670 .disable_swap = xs_disable_swap,
2671 };
2672
2673 static const struct rpc_xprt_ops xs_udp_ops = {
2674 .set_buffer_size = xs_udp_set_buffer_size,
2675 .reserve_xprt = xprt_reserve_xprt_cong,
2676 .release_xprt = xprt_release_xprt_cong,
2677 .alloc_slot = xprt_alloc_slot,
2678 .free_slot = xprt_free_slot,
2679 .rpcbind = rpcb_getport_async,
2680 .set_port = xs_set_port,
2681 .connect = xs_connect,
2682 .buf_alloc = rpc_malloc,
2683 .buf_free = rpc_free,
2684 .send_request = xs_udp_send_request,
2685 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2686 .timer = xs_udp_timer,
2687 .release_request = xprt_release_rqst_cong,
2688 .close = xs_close,
2689 .destroy = xs_destroy,
2690 .print_stats = xs_udp_print_stats,
2691 .enable_swap = xs_enable_swap,
2692 .disable_swap = xs_disable_swap,
2693 .inject_disconnect = xs_inject_disconnect,
2694 };
2695
2696 static const struct rpc_xprt_ops xs_tcp_ops = {
2697 .reserve_xprt = xprt_reserve_xprt,
2698 .release_xprt = xprt_release_xprt,
2699 .alloc_slot = xprt_alloc_slot,
2700 .free_slot = xprt_free_slot,
2701 .rpcbind = rpcb_getport_async,
2702 .set_port = xs_set_port,
2703 .connect = xs_connect,
2704 .buf_alloc = rpc_malloc,
2705 .buf_free = rpc_free,
2706 .prepare_request = xs_stream_prepare_request,
2707 .send_request = xs_tcp_send_request,
2708 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2709 .close = xs_tcp_shutdown,
2710 .destroy = xs_destroy,
2711 .set_connect_timeout = xs_tcp_set_connect_timeout,
2712 .print_stats = xs_tcp_print_stats,
2713 .enable_swap = xs_enable_swap,
2714 .disable_swap = xs_disable_swap,
2715 .inject_disconnect = xs_inject_disconnect,
2716 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2717 .bc_setup = xprt_setup_bc,
2718 .bc_maxpayload = xs_tcp_bc_maxpayload,
2719 .bc_num_slots = xprt_bc_max_slots,
2720 .bc_free_rqst = xprt_free_bc_rqst,
2721 .bc_destroy = xprt_destroy_bc,
2722 #endif
2723 };
2724
2725 /*
2726 * The rpc_xprt_ops for the server backchannel
2727 */
2728
2729 static const struct rpc_xprt_ops bc_tcp_ops = {
2730 .reserve_xprt = xprt_reserve_xprt,
2731 .release_xprt = xprt_release_xprt,
2732 .alloc_slot = xprt_alloc_slot,
2733 .free_slot = xprt_free_slot,
2734 .buf_alloc = bc_malloc,
2735 .buf_free = bc_free,
2736 .send_request = bc_send_request,
2737 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2738 .close = bc_close,
2739 .destroy = bc_destroy,
2740 .print_stats = xs_tcp_print_stats,
2741 .enable_swap = xs_enable_swap,
2742 .disable_swap = xs_disable_swap,
2743 .inject_disconnect = xs_inject_disconnect,
2744 };
2745
xs_init_anyaddr(const int family,struct sockaddr * sap)2746 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2747 {
2748 static const struct sockaddr_in sin = {
2749 .sin_family = AF_INET,
2750 .sin_addr.s_addr = htonl(INADDR_ANY),
2751 };
2752 static const struct sockaddr_in6 sin6 = {
2753 .sin6_family = AF_INET6,
2754 .sin6_addr = IN6ADDR_ANY_INIT,
2755 };
2756
2757 switch (family) {
2758 case AF_LOCAL:
2759 break;
2760 case AF_INET:
2761 memcpy(sap, &sin, sizeof(sin));
2762 break;
2763 case AF_INET6:
2764 memcpy(sap, &sin6, sizeof(sin6));
2765 break;
2766 default:
2767 dprintk("RPC: %s: Bad address family\n", __func__);
2768 return -EAFNOSUPPORT;
2769 }
2770 return 0;
2771 }
2772
xs_setup_xprt(struct xprt_create * args,unsigned int slot_table_size,unsigned int max_slot_table_size)2773 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2774 unsigned int slot_table_size,
2775 unsigned int max_slot_table_size)
2776 {
2777 struct rpc_xprt *xprt;
2778 struct sock_xprt *new;
2779
2780 if (args->addrlen > sizeof(xprt->addr)) {
2781 dprintk("RPC: xs_setup_xprt: address too large\n");
2782 return ERR_PTR(-EBADF);
2783 }
2784
2785 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2786 max_slot_table_size);
2787 if (xprt == NULL) {
2788 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2789 "rpc_xprt\n");
2790 return ERR_PTR(-ENOMEM);
2791 }
2792
2793 new = container_of(xprt, struct sock_xprt, xprt);
2794 mutex_init(&new->recv_mutex);
2795 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2796 xprt->addrlen = args->addrlen;
2797 if (args->srcaddr)
2798 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2799 else {
2800 int err;
2801 err = xs_init_anyaddr(args->dstaddr->sa_family,
2802 (struct sockaddr *)&new->srcaddr);
2803 if (err != 0) {
2804 xprt_free(xprt);
2805 return ERR_PTR(err);
2806 }
2807 }
2808
2809 return xprt;
2810 }
2811
2812 static const struct rpc_timeout xs_local_default_timeout = {
2813 .to_initval = 10 * HZ,
2814 .to_maxval = 10 * HZ,
2815 .to_retries = 2,
2816 };
2817
2818 /**
2819 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2820 * @args: rpc transport creation arguments
2821 *
2822 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2823 */
xs_setup_local(struct xprt_create * args)2824 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2825 {
2826 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2827 struct sock_xprt *transport;
2828 struct rpc_xprt *xprt;
2829 struct rpc_xprt *ret;
2830
2831 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2832 xprt_max_tcp_slot_table_entries);
2833 if (IS_ERR(xprt))
2834 return xprt;
2835 transport = container_of(xprt, struct sock_xprt, xprt);
2836
2837 xprt->prot = 0;
2838 xprt->xprt_class = &xs_local_transport;
2839 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2840
2841 xprt->bind_timeout = XS_BIND_TO;
2842 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2843 xprt->idle_timeout = XS_IDLE_DISC_TO;
2844
2845 xprt->ops = &xs_local_ops;
2846 xprt->timeout = &xs_local_default_timeout;
2847
2848 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2849 INIT_WORK(&transport->error_worker, xs_error_handle);
2850 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2851
2852 switch (sun->sun_family) {
2853 case AF_LOCAL:
2854 if (sun->sun_path[0] != '/') {
2855 dprintk("RPC: bad AF_LOCAL address: %s\n",
2856 sun->sun_path);
2857 ret = ERR_PTR(-EINVAL);
2858 goto out_err;
2859 }
2860 xprt_set_bound(xprt);
2861 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2862 break;
2863 default:
2864 ret = ERR_PTR(-EAFNOSUPPORT);
2865 goto out_err;
2866 }
2867
2868 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2869 xprt->address_strings[RPC_DISPLAY_ADDR]);
2870
2871 if (try_module_get(THIS_MODULE))
2872 return xprt;
2873 ret = ERR_PTR(-EINVAL);
2874 out_err:
2875 xs_xprt_free(xprt);
2876 return ret;
2877 }
2878
2879 static const struct rpc_timeout xs_udp_default_timeout = {
2880 .to_initval = 5 * HZ,
2881 .to_maxval = 30 * HZ,
2882 .to_increment = 5 * HZ,
2883 .to_retries = 5,
2884 };
2885
2886 /**
2887 * xs_setup_udp - Set up transport to use a UDP socket
2888 * @args: rpc transport creation arguments
2889 *
2890 */
xs_setup_udp(struct xprt_create * args)2891 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2892 {
2893 struct sockaddr *addr = args->dstaddr;
2894 struct rpc_xprt *xprt;
2895 struct sock_xprt *transport;
2896 struct rpc_xprt *ret;
2897
2898 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2899 xprt_udp_slot_table_entries);
2900 if (IS_ERR(xprt))
2901 return xprt;
2902 transport = container_of(xprt, struct sock_xprt, xprt);
2903
2904 xprt->prot = IPPROTO_UDP;
2905 xprt->xprt_class = &xs_udp_transport;
2906 /* XXX: header size can vary due to auth type, IPv6, etc. */
2907 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2908
2909 xprt->bind_timeout = XS_BIND_TO;
2910 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2911 xprt->idle_timeout = XS_IDLE_DISC_TO;
2912
2913 xprt->ops = &xs_udp_ops;
2914
2915 xprt->timeout = &xs_udp_default_timeout;
2916
2917 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2918 INIT_WORK(&transport->error_worker, xs_error_handle);
2919 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2920
2921 switch (addr->sa_family) {
2922 case AF_INET:
2923 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2924 xprt_set_bound(xprt);
2925
2926 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2927 break;
2928 case AF_INET6:
2929 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2930 xprt_set_bound(xprt);
2931
2932 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2933 break;
2934 default:
2935 ret = ERR_PTR(-EAFNOSUPPORT);
2936 goto out_err;
2937 }
2938
2939 if (xprt_bound(xprt))
2940 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2941 xprt->address_strings[RPC_DISPLAY_ADDR],
2942 xprt->address_strings[RPC_DISPLAY_PORT],
2943 xprt->address_strings[RPC_DISPLAY_PROTO]);
2944 else
2945 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2946 xprt->address_strings[RPC_DISPLAY_ADDR],
2947 xprt->address_strings[RPC_DISPLAY_PROTO]);
2948
2949 if (try_module_get(THIS_MODULE))
2950 return xprt;
2951 ret = ERR_PTR(-EINVAL);
2952 out_err:
2953 xs_xprt_free(xprt);
2954 return ret;
2955 }
2956
2957 static const struct rpc_timeout xs_tcp_default_timeout = {
2958 .to_initval = 60 * HZ,
2959 .to_maxval = 60 * HZ,
2960 .to_retries = 2,
2961 };
2962
2963 /**
2964 * xs_setup_tcp - Set up transport to use a TCP socket
2965 * @args: rpc transport creation arguments
2966 *
2967 */
xs_setup_tcp(struct xprt_create * args)2968 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2969 {
2970 struct sockaddr *addr = args->dstaddr;
2971 struct rpc_xprt *xprt;
2972 struct sock_xprt *transport;
2973 struct rpc_xprt *ret;
2974 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2975
2976 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2977 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2978
2979 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2980 max_slot_table_size);
2981 if (IS_ERR(xprt))
2982 return xprt;
2983 transport = container_of(xprt, struct sock_xprt, xprt);
2984
2985 xprt->prot = IPPROTO_TCP;
2986 xprt->xprt_class = &xs_tcp_transport;
2987 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2988
2989 xprt->bind_timeout = XS_BIND_TO;
2990 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2991 xprt->idle_timeout = XS_IDLE_DISC_TO;
2992
2993 xprt->ops = &xs_tcp_ops;
2994 xprt->timeout = &xs_tcp_default_timeout;
2995
2996 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2997 xprt->connect_timeout = xprt->timeout->to_initval *
2998 (xprt->timeout->to_retries + 1);
2999
3000 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3001 INIT_WORK(&transport->error_worker, xs_error_handle);
3002 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3003
3004 switch (addr->sa_family) {
3005 case AF_INET:
3006 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3007 xprt_set_bound(xprt);
3008
3009 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3010 break;
3011 case AF_INET6:
3012 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3013 xprt_set_bound(xprt);
3014
3015 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3016 break;
3017 default:
3018 ret = ERR_PTR(-EAFNOSUPPORT);
3019 goto out_err;
3020 }
3021
3022 if (xprt_bound(xprt))
3023 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3024 xprt->address_strings[RPC_DISPLAY_ADDR],
3025 xprt->address_strings[RPC_DISPLAY_PORT],
3026 xprt->address_strings[RPC_DISPLAY_PROTO]);
3027 else
3028 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3029 xprt->address_strings[RPC_DISPLAY_ADDR],
3030 xprt->address_strings[RPC_DISPLAY_PROTO]);
3031
3032 if (try_module_get(THIS_MODULE))
3033 return xprt;
3034 ret = ERR_PTR(-EINVAL);
3035 out_err:
3036 xs_xprt_free(xprt);
3037 return ret;
3038 }
3039
3040 /**
3041 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3042 * @args: rpc transport creation arguments
3043 *
3044 */
xs_setup_bc_tcp(struct xprt_create * args)3045 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3046 {
3047 struct sockaddr *addr = args->dstaddr;
3048 struct rpc_xprt *xprt;
3049 struct sock_xprt *transport;
3050 struct svc_sock *bc_sock;
3051 struct rpc_xprt *ret;
3052
3053 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3054 xprt_tcp_slot_table_entries);
3055 if (IS_ERR(xprt))
3056 return xprt;
3057 transport = container_of(xprt, struct sock_xprt, xprt);
3058
3059 xprt->prot = IPPROTO_TCP;
3060 xprt->xprt_class = &xs_bc_tcp_transport;
3061 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3062 xprt->timeout = &xs_tcp_default_timeout;
3063
3064 /* backchannel */
3065 xprt_set_bound(xprt);
3066 xprt->bind_timeout = 0;
3067 xprt->reestablish_timeout = 0;
3068 xprt->idle_timeout = 0;
3069
3070 xprt->ops = &bc_tcp_ops;
3071
3072 switch (addr->sa_family) {
3073 case AF_INET:
3074 xs_format_peer_addresses(xprt, "tcp",
3075 RPCBIND_NETID_TCP);
3076 break;
3077 case AF_INET6:
3078 xs_format_peer_addresses(xprt, "tcp",
3079 RPCBIND_NETID_TCP6);
3080 break;
3081 default:
3082 ret = ERR_PTR(-EAFNOSUPPORT);
3083 goto out_err;
3084 }
3085
3086 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3087 xprt->address_strings[RPC_DISPLAY_ADDR],
3088 xprt->address_strings[RPC_DISPLAY_PORT],
3089 xprt->address_strings[RPC_DISPLAY_PROTO]);
3090
3091 /*
3092 * Once we've associated a backchannel xprt with a connection,
3093 * we want to keep it around as long as the connection lasts,
3094 * in case we need to start using it for a backchannel again;
3095 * this reference won't be dropped until bc_xprt is destroyed.
3096 */
3097 xprt_get(xprt);
3098 args->bc_xprt->xpt_bc_xprt = xprt;
3099 xprt->bc_xprt = args->bc_xprt;
3100 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3101 transport->sock = bc_sock->sk_sock;
3102 transport->inet = bc_sock->sk_sk;
3103
3104 /*
3105 * Since we don't want connections for the backchannel, we set
3106 * the xprt status to connected
3107 */
3108 xprt_set_connected(xprt);
3109
3110 if (try_module_get(THIS_MODULE))
3111 return xprt;
3112
3113 args->bc_xprt->xpt_bc_xprt = NULL;
3114 args->bc_xprt->xpt_bc_xps = NULL;
3115 xprt_put(xprt);
3116 ret = ERR_PTR(-EINVAL);
3117 out_err:
3118 xs_xprt_free(xprt);
3119 return ret;
3120 }
3121
3122 static struct xprt_class xs_local_transport = {
3123 .list = LIST_HEAD_INIT(xs_local_transport.list),
3124 .name = "named UNIX socket",
3125 .owner = THIS_MODULE,
3126 .ident = XPRT_TRANSPORT_LOCAL,
3127 .setup = xs_setup_local,
3128 .netid = { "" },
3129 };
3130
3131 static struct xprt_class xs_udp_transport = {
3132 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3133 .name = "udp",
3134 .owner = THIS_MODULE,
3135 .ident = XPRT_TRANSPORT_UDP,
3136 .setup = xs_setup_udp,
3137 .netid = { "udp", "udp6", "" },
3138 };
3139
3140 static struct xprt_class xs_tcp_transport = {
3141 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3142 .name = "tcp",
3143 .owner = THIS_MODULE,
3144 .ident = XPRT_TRANSPORT_TCP,
3145 .setup = xs_setup_tcp,
3146 .netid = { "tcp", "tcp6", "" },
3147 };
3148
3149 static struct xprt_class xs_bc_tcp_transport = {
3150 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3151 .name = "tcp NFSv4.1 backchannel",
3152 .owner = THIS_MODULE,
3153 .ident = XPRT_TRANSPORT_BC_TCP,
3154 .setup = xs_setup_bc_tcp,
3155 .netid = { "" },
3156 };
3157
3158 /**
3159 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3160 *
3161 */
init_socket_xprt(void)3162 int init_socket_xprt(void)
3163 {
3164 if (!sunrpc_table_header)
3165 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3166
3167 xprt_register_transport(&xs_local_transport);
3168 xprt_register_transport(&xs_udp_transport);
3169 xprt_register_transport(&xs_tcp_transport);
3170 xprt_register_transport(&xs_bc_tcp_transport);
3171
3172 return 0;
3173 }
3174
3175 /**
3176 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3177 *
3178 */
cleanup_socket_xprt(void)3179 void cleanup_socket_xprt(void)
3180 {
3181 if (sunrpc_table_header) {
3182 unregister_sysctl_table(sunrpc_table_header);
3183 sunrpc_table_header = NULL;
3184 }
3185
3186 xprt_unregister_transport(&xs_local_transport);
3187 xprt_unregister_transport(&xs_udp_transport);
3188 xprt_unregister_transport(&xs_tcp_transport);
3189 xprt_unregister_transport(&xs_bc_tcp_transport);
3190 }
3191
param_set_portnr(const char * val,const struct kernel_param * kp)3192 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3193 {
3194 return param_set_uint_minmax(val, kp,
3195 RPC_MIN_RESVPORT,
3196 RPC_MAX_RESVPORT);
3197 }
3198
3199 static const struct kernel_param_ops param_ops_portnr = {
3200 .set = param_set_portnr,
3201 .get = param_get_uint,
3202 };
3203
3204 #define param_check_portnr(name, p) \
3205 __param_check(name, p, unsigned int);
3206
3207 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3208 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3209
param_set_slot_table_size(const char * val,const struct kernel_param * kp)3210 static int param_set_slot_table_size(const char *val,
3211 const struct kernel_param *kp)
3212 {
3213 return param_set_uint_minmax(val, kp,
3214 RPC_MIN_SLOT_TABLE,
3215 RPC_MAX_SLOT_TABLE);
3216 }
3217
3218 static const struct kernel_param_ops param_ops_slot_table_size = {
3219 .set = param_set_slot_table_size,
3220 .get = param_get_uint,
3221 };
3222
3223 #define param_check_slot_table_size(name, p) \
3224 __param_check(name, p, unsigned int);
3225
param_set_max_slot_table_size(const char * val,const struct kernel_param * kp)3226 static int param_set_max_slot_table_size(const char *val,
3227 const struct kernel_param *kp)
3228 {
3229 return param_set_uint_minmax(val, kp,
3230 RPC_MIN_SLOT_TABLE,
3231 RPC_MAX_SLOT_TABLE_LIMIT);
3232 }
3233
3234 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3235 .set = param_set_max_slot_table_size,
3236 .get = param_get_uint,
3237 };
3238
3239 #define param_check_max_slot_table_size(name, p) \
3240 __param_check(name, p, unsigned int);
3241
3242 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3243 slot_table_size, 0644);
3244 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3245 max_slot_table_size, 0644);
3246 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3247 slot_table_size, 0644);
3248