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 <net/tls_prot.h>
51 #include <net/handshake.h>
52
53 #include <linux/bvec.h>
54 #include <linux/highmem.h>
55 #include <linux/uio.h>
56 #include <linux/sched/mm.h>
57
58 #include <trace/events/sock.h>
59 #include <trace/events/sunrpc.h>
60
61 #include "socklib.h"
62 #include "sunrpc.h"
63
64 static void xs_close(struct rpc_xprt *xprt);
65 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
66 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
67 struct socket *sock);
68
69 /*
70 * xprtsock tunables
71 */
72 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
73 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
74 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
75
76 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
77 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
78
79 #define XS_TCP_LINGER_TO (15U * HZ)
80 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
81
82 /*
83 * We can register our own files under /proc/sys/sunrpc by
84 * calling register_sysctl() again. The files in that
85 * directory become the union of all files registered there.
86 *
87 * We simply need to make sure that we don't collide with
88 * someone else's file names!
89 */
90
91 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
92 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
93 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
94 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
95 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
96
97 static struct ctl_table_header *sunrpc_table_header;
98
99 static struct xprt_class xs_local_transport;
100 static struct xprt_class xs_udp_transport;
101 static struct xprt_class xs_tcp_transport;
102 static struct xprt_class xs_tcp_tls_transport;
103 static struct xprt_class xs_bc_tcp_transport;
104
105 /*
106 * FIXME: changing the UDP slot table size should also resize the UDP
107 * socket buffers for existing UDP transports
108 */
109 static struct ctl_table xs_tunables_table[] = {
110 {
111 .procname = "udp_slot_table_entries",
112 .data = &xprt_udp_slot_table_entries,
113 .maxlen = sizeof(unsigned int),
114 .mode = 0644,
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &min_slot_table_size,
117 .extra2 = &max_slot_table_size
118 },
119 {
120 .procname = "tcp_slot_table_entries",
121 .data = &xprt_tcp_slot_table_entries,
122 .maxlen = sizeof(unsigned int),
123 .mode = 0644,
124 .proc_handler = proc_dointvec_minmax,
125 .extra1 = &min_slot_table_size,
126 .extra2 = &max_slot_table_size
127 },
128 {
129 .procname = "tcp_max_slot_table_entries",
130 .data = &xprt_max_tcp_slot_table_entries,
131 .maxlen = sizeof(unsigned int),
132 .mode = 0644,
133 .proc_handler = proc_dointvec_minmax,
134 .extra1 = &min_slot_table_size,
135 .extra2 = &max_tcp_slot_table_limit
136 },
137 {
138 .procname = "min_resvport",
139 .data = &xprt_min_resvport,
140 .maxlen = sizeof(unsigned int),
141 .mode = 0644,
142 .proc_handler = proc_dointvec_minmax,
143 .extra1 = &xprt_min_resvport_limit,
144 .extra2 = &xprt_max_resvport_limit
145 },
146 {
147 .procname = "max_resvport",
148 .data = &xprt_max_resvport,
149 .maxlen = sizeof(unsigned int),
150 .mode = 0644,
151 .proc_handler = proc_dointvec_minmax,
152 .extra1 = &xprt_min_resvport_limit,
153 .extra2 = &xprt_max_resvport_limit
154 },
155 {
156 .procname = "tcp_fin_timeout",
157 .data = &xs_tcp_fin_timeout,
158 .maxlen = sizeof(xs_tcp_fin_timeout),
159 .mode = 0644,
160 .proc_handler = proc_dointvec_jiffies,
161 },
162 { },
163 };
164
165 /*
166 * Wait duration for a reply from the RPC portmapper.
167 */
168 #define XS_BIND_TO (60U * HZ)
169
170 /*
171 * Delay if a UDP socket connect error occurs. This is most likely some
172 * kind of resource problem on the local host.
173 */
174 #define XS_UDP_REEST_TO (2U * HZ)
175
176 /*
177 * The reestablish timeout allows clients to delay for a bit before attempting
178 * to reconnect to a server that just dropped our connection.
179 *
180 * We implement an exponential backoff when trying to reestablish a TCP
181 * transport connection with the server. Some servers like to drop a TCP
182 * connection when they are overworked, so we start with a short timeout and
183 * increase over time if the server is down or not responding.
184 */
185 #define XS_TCP_INIT_REEST_TO (3U * HZ)
186
187 /*
188 * TCP idle timeout; client drops the transport socket if it is idle
189 * for this long. Note that we also timeout UDP sockets to prevent
190 * holding port numbers when there is no RPC traffic.
191 */
192 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
193
194 /*
195 * TLS handshake timeout.
196 */
197 #define XS_TLS_HANDSHAKE_TO (10U * HZ)
198
199 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
200 # undef RPC_DEBUG_DATA
201 # define RPCDBG_FACILITY RPCDBG_TRANS
202 #endif
203
204 #ifdef RPC_DEBUG_DATA
xs_pktdump(char * msg,u32 * packet,unsigned int count)205 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
206 {
207 u8 *buf = (u8 *) packet;
208 int j;
209
210 dprintk("RPC: %s\n", msg);
211 for (j = 0; j < count && j < 128; j += 4) {
212 if (!(j & 31)) {
213 if (j)
214 dprintk("\n");
215 dprintk("0x%04x ", j);
216 }
217 dprintk("%02x%02x%02x%02x ",
218 buf[j], buf[j+1], buf[j+2], buf[j+3]);
219 }
220 dprintk("\n");
221 }
222 #else
xs_pktdump(char * msg,u32 * packet,unsigned int count)223 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
224 {
225 /* NOP */
226 }
227 #endif
228
xprt_from_sock(struct sock * sk)229 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
230 {
231 return (struct rpc_xprt *) sk->sk_user_data;
232 }
233
xs_addr(struct rpc_xprt * xprt)234 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
235 {
236 return (struct sockaddr *) &xprt->addr;
237 }
238
xs_addr_un(struct rpc_xprt * xprt)239 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
240 {
241 return (struct sockaddr_un *) &xprt->addr;
242 }
243
xs_addr_in(struct rpc_xprt * xprt)244 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
245 {
246 return (struct sockaddr_in *) &xprt->addr;
247 }
248
xs_addr_in6(struct rpc_xprt * xprt)249 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
250 {
251 return (struct sockaddr_in6 *) &xprt->addr;
252 }
253
xs_format_common_peer_addresses(struct rpc_xprt * xprt)254 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
255 {
256 struct sockaddr *sap = xs_addr(xprt);
257 struct sockaddr_in6 *sin6;
258 struct sockaddr_in *sin;
259 struct sockaddr_un *sun;
260 char buf[128];
261
262 switch (sap->sa_family) {
263 case AF_LOCAL:
264 sun = xs_addr_un(xprt);
265 if (sun->sun_path[0]) {
266 strscpy(buf, sun->sun_path, sizeof(buf));
267 } else {
268 buf[0] = '@';
269 strscpy(buf+1, sun->sun_path+1, sizeof(buf)-1);
270 }
271 xprt->address_strings[RPC_DISPLAY_ADDR] =
272 kstrdup(buf, GFP_KERNEL);
273 break;
274 case AF_INET:
275 (void)rpc_ntop(sap, buf, sizeof(buf));
276 xprt->address_strings[RPC_DISPLAY_ADDR] =
277 kstrdup(buf, GFP_KERNEL);
278 sin = xs_addr_in(xprt);
279 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
280 break;
281 case AF_INET6:
282 (void)rpc_ntop(sap, buf, sizeof(buf));
283 xprt->address_strings[RPC_DISPLAY_ADDR] =
284 kstrdup(buf, GFP_KERNEL);
285 sin6 = xs_addr_in6(xprt);
286 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
287 break;
288 default:
289 BUG();
290 }
291
292 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
293 }
294
xs_format_common_peer_ports(struct rpc_xprt * xprt)295 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
296 {
297 struct sockaddr *sap = xs_addr(xprt);
298 char buf[128];
299
300 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
301 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
302
303 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
304 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
305 }
306
xs_format_peer_addresses(struct rpc_xprt * xprt,const char * protocol,const char * netid)307 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
308 const char *protocol,
309 const char *netid)
310 {
311 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
312 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
313 xs_format_common_peer_addresses(xprt);
314 xs_format_common_peer_ports(xprt);
315 }
316
xs_update_peer_port(struct rpc_xprt * xprt)317 static void xs_update_peer_port(struct rpc_xprt *xprt)
318 {
319 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
320 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
321
322 xs_format_common_peer_ports(xprt);
323 }
324
xs_free_peer_addresses(struct rpc_xprt * xprt)325 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
326 {
327 unsigned int i;
328
329 for (i = 0; i < RPC_DISPLAY_MAX; i++)
330 switch (i) {
331 case RPC_DISPLAY_PROTO:
332 case RPC_DISPLAY_NETID:
333 continue;
334 default:
335 kfree(xprt->address_strings[i]);
336 }
337 }
338
339 static size_t
xs_alloc_sparse_pages(struct xdr_buf * buf,size_t want,gfp_t gfp)340 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
341 {
342 size_t i,n;
343
344 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
345 return want;
346 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
347 for (i = 0; i < n; i++) {
348 if (buf->pages[i])
349 continue;
350 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
351 if (!buf->pages[i]) {
352 i *= PAGE_SIZE;
353 return i > buf->page_base ? i - buf->page_base : 0;
354 }
355 }
356 return want;
357 }
358
359 static int
xs_sock_process_cmsg(struct socket * sock,struct msghdr * msg,struct cmsghdr * cmsg,int ret)360 xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
361 struct cmsghdr *cmsg, int ret)
362 {
363 u8 content_type = tls_get_record_type(sock->sk, cmsg);
364 u8 level, description;
365
366 switch (content_type) {
367 case 0:
368 break;
369 case TLS_RECORD_TYPE_DATA:
370 /* TLS sets EOR at the end of each application data
371 * record, even though there might be more frames
372 * waiting to be decrypted.
373 */
374 msg->msg_flags &= ~MSG_EOR;
375 break;
376 case TLS_RECORD_TYPE_ALERT:
377 tls_alert_recv(sock->sk, msg, &level, &description);
378 ret = (level == TLS_ALERT_LEVEL_FATAL) ?
379 -EACCES : -EAGAIN;
380 break;
381 default:
382 /* discard this record type */
383 ret = -EAGAIN;
384 }
385 return ret;
386 }
387
388 static int
xs_sock_recv_cmsg(struct socket * sock,struct msghdr * msg,int flags)389 xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags)
390 {
391 union {
392 struct cmsghdr cmsg;
393 u8 buf[CMSG_SPACE(sizeof(u8))];
394 } u;
395 int ret;
396
397 msg->msg_control = &u;
398 msg->msg_controllen = sizeof(u);
399 ret = sock_recvmsg(sock, msg, flags);
400 if (msg->msg_controllen != sizeof(u))
401 ret = xs_sock_process_cmsg(sock, msg, &u.cmsg, ret);
402 return ret;
403 }
404
405 static ssize_t
xs_sock_recvmsg(struct socket * sock,struct msghdr * msg,int flags,size_t seek)406 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
407 {
408 ssize_t ret;
409 if (seek != 0)
410 iov_iter_advance(&msg->msg_iter, seek);
411 ret = xs_sock_recv_cmsg(sock, msg, flags);
412 return ret > 0 ? ret + seek : ret;
413 }
414
415 static ssize_t
xs_read_kvec(struct socket * sock,struct msghdr * msg,int flags,struct kvec * kvec,size_t count,size_t seek)416 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
417 struct kvec *kvec, size_t count, size_t seek)
418 {
419 iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
420 return xs_sock_recvmsg(sock, msg, flags, seek);
421 }
422
423 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)424 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
425 struct bio_vec *bvec, unsigned long nr, size_t count,
426 size_t seek)
427 {
428 iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
429 return xs_sock_recvmsg(sock, msg, flags, seek);
430 }
431
432 static ssize_t
xs_read_discard(struct socket * sock,struct msghdr * msg,int flags,size_t count)433 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
434 size_t count)
435 {
436 iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
437 return xs_sock_recv_cmsg(sock, msg, flags);
438 }
439
440 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
441 static void
xs_flush_bvec(const struct bio_vec * bvec,size_t count,size_t seek)442 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
443 {
444 struct bvec_iter bi = {
445 .bi_size = count,
446 };
447 struct bio_vec bv;
448
449 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
450 for_each_bvec(bv, bvec, bi, bi)
451 flush_dcache_page(bv.bv_page);
452 }
453 #else
454 static inline void
xs_flush_bvec(const struct bio_vec * bvec,size_t count,size_t seek)455 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
456 {
457 }
458 #endif
459
460 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)461 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
462 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
463 {
464 size_t want, seek_init = seek, offset = 0;
465 ssize_t ret;
466
467 want = min_t(size_t, count, buf->head[0].iov_len);
468 if (seek < want) {
469 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
470 if (ret <= 0)
471 goto sock_err;
472 offset += ret;
473 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
474 goto out;
475 if (ret != want)
476 goto out;
477 seek = 0;
478 } else {
479 seek -= want;
480 offset += want;
481 }
482
483 want = xs_alloc_sparse_pages(
484 buf, min_t(size_t, count - offset, buf->page_len),
485 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
486 if (seek < want) {
487 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
488 xdr_buf_pagecount(buf),
489 want + buf->page_base,
490 seek + buf->page_base);
491 if (ret <= 0)
492 goto sock_err;
493 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
494 ret -= buf->page_base;
495 offset += ret;
496 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
497 goto out;
498 if (ret != want)
499 goto out;
500 seek = 0;
501 } else {
502 seek -= want;
503 offset += want;
504 }
505
506 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
507 if (seek < want) {
508 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
509 if (ret <= 0)
510 goto sock_err;
511 offset += ret;
512 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
513 goto out;
514 if (ret != want)
515 goto out;
516 } else if (offset < seek_init)
517 offset = seek_init;
518 ret = -EMSGSIZE;
519 out:
520 *read = offset - seek_init;
521 return ret;
522 sock_err:
523 offset += seek;
524 goto out;
525 }
526
527 static void
xs_read_header(struct sock_xprt * transport,struct xdr_buf * buf)528 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
529 {
530 if (!transport->recv.copied) {
531 if (buf->head[0].iov_len >= transport->recv.offset)
532 memcpy(buf->head[0].iov_base,
533 &transport->recv.xid,
534 transport->recv.offset);
535 transport->recv.copied = transport->recv.offset;
536 }
537 }
538
539 static bool
xs_read_stream_request_done(struct sock_xprt * transport)540 xs_read_stream_request_done(struct sock_xprt *transport)
541 {
542 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
543 }
544
545 static void
xs_read_stream_check_eor(struct sock_xprt * transport,struct msghdr * msg)546 xs_read_stream_check_eor(struct sock_xprt *transport,
547 struct msghdr *msg)
548 {
549 if (xs_read_stream_request_done(transport))
550 msg->msg_flags |= MSG_EOR;
551 }
552
553 static ssize_t
xs_read_stream_request(struct sock_xprt * transport,struct msghdr * msg,int flags,struct rpc_rqst * req)554 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
555 int flags, struct rpc_rqst *req)
556 {
557 struct xdr_buf *buf = &req->rq_private_buf;
558 size_t want, read;
559 ssize_t ret;
560
561 xs_read_header(transport, buf);
562
563 want = transport->recv.len - transport->recv.offset;
564 if (want != 0) {
565 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
566 transport->recv.copied + want,
567 transport->recv.copied,
568 &read);
569 transport->recv.offset += read;
570 transport->recv.copied += read;
571 }
572
573 if (transport->recv.offset == transport->recv.len)
574 xs_read_stream_check_eor(transport, msg);
575
576 if (want == 0)
577 return 0;
578
579 switch (ret) {
580 default:
581 break;
582 case -EFAULT:
583 case -EMSGSIZE:
584 msg->msg_flags |= MSG_TRUNC;
585 return read;
586 case 0:
587 return -ESHUTDOWN;
588 }
589 return ret < 0 ? ret : read;
590 }
591
592 static size_t
xs_read_stream_headersize(bool isfrag)593 xs_read_stream_headersize(bool isfrag)
594 {
595 if (isfrag)
596 return sizeof(__be32);
597 return 3 * sizeof(__be32);
598 }
599
600 static ssize_t
xs_read_stream_header(struct sock_xprt * transport,struct msghdr * msg,int flags,size_t want,size_t seek)601 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
602 int flags, size_t want, size_t seek)
603 {
604 struct kvec kvec = {
605 .iov_base = &transport->recv.fraghdr,
606 .iov_len = want,
607 };
608 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
609 }
610
611 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
612 static ssize_t
xs_read_stream_call(struct sock_xprt * transport,struct msghdr * msg,int flags)613 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
614 {
615 struct rpc_xprt *xprt = &transport->xprt;
616 struct rpc_rqst *req;
617 ssize_t ret;
618
619 /* Is this transport associated with the backchannel? */
620 if (!xprt->bc_serv)
621 return -ESHUTDOWN;
622
623 /* Look up and lock the request corresponding to the given XID */
624 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
625 if (!req) {
626 printk(KERN_WARNING "Callback slot table overflowed\n");
627 return -ESHUTDOWN;
628 }
629 if (transport->recv.copied && !req->rq_private_buf.len)
630 return -ESHUTDOWN;
631
632 ret = xs_read_stream_request(transport, msg, flags, req);
633 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
634 xprt_complete_bc_request(req, transport->recv.copied);
635 else
636 req->rq_private_buf.len = transport->recv.copied;
637
638 return ret;
639 }
640 #else /* CONFIG_SUNRPC_BACKCHANNEL */
641 static ssize_t
xs_read_stream_call(struct sock_xprt * transport,struct msghdr * msg,int flags)642 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
643 {
644 return -ESHUTDOWN;
645 }
646 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
647
648 static ssize_t
xs_read_stream_reply(struct sock_xprt * transport,struct msghdr * msg,int flags)649 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
650 {
651 struct rpc_xprt *xprt = &transport->xprt;
652 struct rpc_rqst *req;
653 ssize_t ret = 0;
654
655 /* Look up and lock the request corresponding to the given XID */
656 spin_lock(&xprt->queue_lock);
657 req = xprt_lookup_rqst(xprt, transport->recv.xid);
658 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
659 msg->msg_flags |= MSG_TRUNC;
660 goto out;
661 }
662 xprt_pin_rqst(req);
663 spin_unlock(&xprt->queue_lock);
664
665 ret = xs_read_stream_request(transport, msg, flags, req);
666
667 spin_lock(&xprt->queue_lock);
668 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
669 xprt_complete_rqst(req->rq_task, transport->recv.copied);
670 else
671 req->rq_private_buf.len = transport->recv.copied;
672 xprt_unpin_rqst(req);
673 out:
674 spin_unlock(&xprt->queue_lock);
675 return ret;
676 }
677
678 static ssize_t
xs_read_stream(struct sock_xprt * transport,int flags)679 xs_read_stream(struct sock_xprt *transport, int flags)
680 {
681 struct msghdr msg = { 0 };
682 size_t want, read = 0;
683 ssize_t ret = 0;
684
685 if (transport->recv.len == 0) {
686 want = xs_read_stream_headersize(transport->recv.copied != 0);
687 ret = xs_read_stream_header(transport, &msg, flags, want,
688 transport->recv.offset);
689 if (ret <= 0)
690 goto out_err;
691 transport->recv.offset = ret;
692 if (transport->recv.offset != want)
693 return transport->recv.offset;
694 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
695 RPC_FRAGMENT_SIZE_MASK;
696 transport->recv.offset -= sizeof(transport->recv.fraghdr);
697 read = ret;
698 }
699
700 switch (be32_to_cpu(transport->recv.calldir)) {
701 default:
702 msg.msg_flags |= MSG_TRUNC;
703 break;
704 case RPC_CALL:
705 ret = xs_read_stream_call(transport, &msg, flags);
706 break;
707 case RPC_REPLY:
708 ret = xs_read_stream_reply(transport, &msg, flags);
709 }
710 if (msg.msg_flags & MSG_TRUNC) {
711 transport->recv.calldir = cpu_to_be32(-1);
712 transport->recv.copied = -1;
713 }
714 if (ret < 0)
715 goto out_err;
716 read += ret;
717 if (transport->recv.offset < transport->recv.len) {
718 if (!(msg.msg_flags & MSG_TRUNC))
719 return read;
720 msg.msg_flags = 0;
721 ret = xs_read_discard(transport->sock, &msg, flags,
722 transport->recv.len - transport->recv.offset);
723 if (ret <= 0)
724 goto out_err;
725 transport->recv.offset += ret;
726 read += ret;
727 if (transport->recv.offset != transport->recv.len)
728 return read;
729 }
730 if (xs_read_stream_request_done(transport)) {
731 trace_xs_stream_read_request(transport);
732 transport->recv.copied = 0;
733 }
734 transport->recv.offset = 0;
735 transport->recv.len = 0;
736 return read;
737 out_err:
738 return ret != 0 ? ret : -ESHUTDOWN;
739 }
740
xs_poll_socket(struct sock_xprt * transport)741 static __poll_t xs_poll_socket(struct sock_xprt *transport)
742 {
743 return transport->sock->ops->poll(transport->file, transport->sock,
744 NULL);
745 }
746
xs_poll_socket_readable(struct sock_xprt * transport)747 static bool xs_poll_socket_readable(struct sock_xprt *transport)
748 {
749 __poll_t events = xs_poll_socket(transport);
750
751 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
752 }
753
xs_poll_check_readable(struct sock_xprt * transport)754 static void xs_poll_check_readable(struct sock_xprt *transport)
755 {
756
757 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
758 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
759 return;
760 if (!xs_poll_socket_readable(transport))
761 return;
762 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
763 queue_work(xprtiod_workqueue, &transport->recv_worker);
764 }
765
xs_stream_data_receive(struct sock_xprt * transport)766 static void xs_stream_data_receive(struct sock_xprt *transport)
767 {
768 size_t read = 0;
769 ssize_t ret = 0;
770
771 mutex_lock(&transport->recv_mutex);
772 if (transport->sock == NULL)
773 goto out;
774 for (;;) {
775 ret = xs_read_stream(transport, MSG_DONTWAIT);
776 if (ret < 0)
777 break;
778 read += ret;
779 cond_resched();
780 }
781 if (ret == -ESHUTDOWN)
782 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
783 else if (ret == -EACCES)
784 xprt_wake_pending_tasks(&transport->xprt, -EACCES);
785 else
786 xs_poll_check_readable(transport);
787 out:
788 mutex_unlock(&transport->recv_mutex);
789 trace_xs_stream_read_data(&transport->xprt, ret, read);
790 }
791
xs_stream_data_receive_workfn(struct work_struct * work)792 static void xs_stream_data_receive_workfn(struct work_struct *work)
793 {
794 struct sock_xprt *transport =
795 container_of(work, struct sock_xprt, recv_worker);
796 unsigned int pflags = memalloc_nofs_save();
797
798 xs_stream_data_receive(transport);
799 memalloc_nofs_restore(pflags);
800 }
801
802 static void
xs_stream_reset_connect(struct sock_xprt * transport)803 xs_stream_reset_connect(struct sock_xprt *transport)
804 {
805 transport->recv.offset = 0;
806 transport->recv.len = 0;
807 transport->recv.copied = 0;
808 transport->xmit.offset = 0;
809 }
810
811 static void
xs_stream_start_connect(struct sock_xprt * transport)812 xs_stream_start_connect(struct sock_xprt *transport)
813 {
814 transport->xprt.stat.connect_count++;
815 transport->xprt.stat.connect_start = jiffies;
816 }
817
818 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
819
820 /**
821 * xs_nospace - handle transmit was incomplete
822 * @req: pointer to RPC request
823 * @transport: pointer to struct sock_xprt
824 *
825 */
xs_nospace(struct rpc_rqst * req,struct sock_xprt * transport)826 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
827 {
828 struct rpc_xprt *xprt = &transport->xprt;
829 struct sock *sk = transport->inet;
830 int ret = -EAGAIN;
831
832 trace_rpc_socket_nospace(req, transport);
833
834 /* Protect against races with write_space */
835 spin_lock(&xprt->transport_lock);
836
837 /* Don't race with disconnect */
838 if (xprt_connected(xprt)) {
839 /* wait for more buffer space */
840 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
841 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
842 sk->sk_write_pending++;
843 xprt_wait_for_buffer_space(xprt);
844 } else
845 ret = -ENOTCONN;
846
847 spin_unlock(&xprt->transport_lock);
848 return ret;
849 }
850
xs_sock_nospace(struct rpc_rqst * req)851 static int xs_sock_nospace(struct rpc_rqst *req)
852 {
853 struct sock_xprt *transport =
854 container_of(req->rq_xprt, struct sock_xprt, xprt);
855 struct sock *sk = transport->inet;
856 int ret = -EAGAIN;
857
858 lock_sock(sk);
859 if (!sock_writeable(sk))
860 ret = xs_nospace(req, transport);
861 release_sock(sk);
862 return ret;
863 }
864
xs_stream_nospace(struct rpc_rqst * req,bool vm_wait)865 static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
866 {
867 struct sock_xprt *transport =
868 container_of(req->rq_xprt, struct sock_xprt, xprt);
869 struct sock *sk = transport->inet;
870 int ret = -EAGAIN;
871
872 if (vm_wait)
873 return -ENOBUFS;
874 lock_sock(sk);
875 if (!sk_stream_memory_free(sk))
876 ret = xs_nospace(req, transport);
877 release_sock(sk);
878 return ret;
879 }
880
xs_stream_prepare_request(struct rpc_rqst * req,struct xdr_buf * buf)881 static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
882 {
883 return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
884 }
885
886 /*
887 * Determine if the previous message in the stream was aborted before it
888 * could complete transmission.
889 */
890 static bool
xs_send_request_was_aborted(struct sock_xprt * transport,struct rpc_rqst * req)891 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
892 {
893 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
894 }
895
896 /*
897 * Return the stream record marker field for a record of length < 2^31-1
898 */
899 static rpc_fraghdr
xs_stream_record_marker(struct xdr_buf * xdr)900 xs_stream_record_marker(struct xdr_buf *xdr)
901 {
902 if (!xdr->len)
903 return 0;
904 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
905 }
906
907 /**
908 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
909 * @req: pointer to RPC request
910 *
911 * Return values:
912 * 0: The request has been sent
913 * EAGAIN: The socket was blocked, please call again later to
914 * complete the request
915 * ENOTCONN: Caller needs to invoke connect logic then call again
916 * other: Some other error occurred, the request was not sent
917 */
xs_local_send_request(struct rpc_rqst * req)918 static int xs_local_send_request(struct rpc_rqst *req)
919 {
920 struct rpc_xprt *xprt = req->rq_xprt;
921 struct sock_xprt *transport =
922 container_of(xprt, struct sock_xprt, xprt);
923 struct xdr_buf *xdr = &req->rq_snd_buf;
924 rpc_fraghdr rm = xs_stream_record_marker(xdr);
925 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
926 struct msghdr msg = {
927 .msg_flags = XS_SENDMSG_FLAGS,
928 };
929 bool vm_wait;
930 unsigned int sent;
931 int status;
932
933 /* Close the stream if the previous transmission was incomplete */
934 if (xs_send_request_was_aborted(transport, req)) {
935 xprt_force_disconnect(xprt);
936 return -ENOTCONN;
937 }
938
939 xs_pktdump("packet data:",
940 req->rq_svec->iov_base, req->rq_svec->iov_len);
941
942 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
943
944 req->rq_xtime = ktime_get();
945 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
946 transport->xmit.offset, rm, &sent);
947 dprintk("RPC: %s(%u) = %d\n",
948 __func__, xdr->len - transport->xmit.offset, status);
949
950 if (likely(sent > 0) || status == 0) {
951 transport->xmit.offset += sent;
952 req->rq_bytes_sent = transport->xmit.offset;
953 if (likely(req->rq_bytes_sent >= msglen)) {
954 req->rq_xmit_bytes_sent += transport->xmit.offset;
955 transport->xmit.offset = 0;
956 return 0;
957 }
958 status = -EAGAIN;
959 vm_wait = false;
960 }
961
962 switch (status) {
963 case -EAGAIN:
964 status = xs_stream_nospace(req, vm_wait);
965 break;
966 default:
967 dprintk("RPC: sendmsg returned unrecognized error %d\n",
968 -status);
969 fallthrough;
970 case -EPIPE:
971 xprt_force_disconnect(xprt);
972 status = -ENOTCONN;
973 }
974
975 return status;
976 }
977
978 /**
979 * xs_udp_send_request - write an RPC request to a UDP socket
980 * @req: pointer to RPC request
981 *
982 * Return values:
983 * 0: The request has been sent
984 * EAGAIN: The socket was blocked, please call again later to
985 * complete the request
986 * ENOTCONN: Caller needs to invoke connect logic then call again
987 * other: Some other error occurred, the request was not sent
988 */
xs_udp_send_request(struct rpc_rqst * req)989 static int xs_udp_send_request(struct rpc_rqst *req)
990 {
991 struct rpc_xprt *xprt = req->rq_xprt;
992 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
993 struct xdr_buf *xdr = &req->rq_snd_buf;
994 struct msghdr msg = {
995 .msg_name = xs_addr(xprt),
996 .msg_namelen = xprt->addrlen,
997 .msg_flags = XS_SENDMSG_FLAGS,
998 };
999 unsigned int sent;
1000 int status;
1001
1002 xs_pktdump("packet data:",
1003 req->rq_svec->iov_base,
1004 req->rq_svec->iov_len);
1005
1006 if (!xprt_bound(xprt))
1007 return -ENOTCONN;
1008
1009 if (!xprt_request_get_cong(xprt, req))
1010 return -EBADSLT;
1011
1012 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
1013 if (status < 0)
1014 return status;
1015 req->rq_xtime = ktime_get();
1016 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
1017
1018 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1019 xdr->len, status);
1020
1021 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1022 if (status == -EPERM)
1023 goto process_status;
1024
1025 if (status == -EAGAIN && sock_writeable(transport->inet))
1026 status = -ENOBUFS;
1027
1028 if (sent > 0 || status == 0) {
1029 req->rq_xmit_bytes_sent += sent;
1030 if (sent >= req->rq_slen)
1031 return 0;
1032 /* Still some bytes left; set up for a retry later. */
1033 status = -EAGAIN;
1034 }
1035
1036 process_status:
1037 switch (status) {
1038 case -ENOTSOCK:
1039 status = -ENOTCONN;
1040 /* Should we call xs_close() here? */
1041 break;
1042 case -EAGAIN:
1043 status = xs_sock_nospace(req);
1044 break;
1045 case -ENETUNREACH:
1046 case -ENOBUFS:
1047 case -EPIPE:
1048 case -ECONNREFUSED:
1049 case -EPERM:
1050 /* When the server has died, an ICMP port unreachable message
1051 * prompts ECONNREFUSED. */
1052 break;
1053 default:
1054 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1055 -status);
1056 }
1057
1058 return status;
1059 }
1060
1061 /**
1062 * xs_tcp_send_request - write an RPC request to a TCP socket
1063 * @req: pointer to RPC request
1064 *
1065 * Return values:
1066 * 0: The request has been sent
1067 * EAGAIN: The socket was blocked, please call again later to
1068 * complete the request
1069 * ENOTCONN: Caller needs to invoke connect logic then call again
1070 * other: Some other error occurred, the request was not sent
1071 *
1072 * XXX: In the case of soft timeouts, should we eventually give up
1073 * if sendmsg is not able to make progress?
1074 */
xs_tcp_send_request(struct rpc_rqst * req)1075 static int xs_tcp_send_request(struct rpc_rqst *req)
1076 {
1077 struct rpc_xprt *xprt = req->rq_xprt;
1078 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1079 struct xdr_buf *xdr = &req->rq_snd_buf;
1080 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1081 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1082 struct msghdr msg = {
1083 .msg_flags = XS_SENDMSG_FLAGS,
1084 };
1085 bool vm_wait;
1086 unsigned int sent;
1087 int status;
1088
1089 /* Close the stream if the previous transmission was incomplete */
1090 if (xs_send_request_was_aborted(transport, req)) {
1091 if (transport->sock != NULL)
1092 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1093 return -ENOTCONN;
1094 }
1095 if (!transport->inet)
1096 return -ENOTCONN;
1097
1098 xs_pktdump("packet data:",
1099 req->rq_svec->iov_base,
1100 req->rq_svec->iov_len);
1101
1102 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1103 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1104
1105 xs_set_srcport(transport, transport->sock);
1106
1107 /* Continue transmitting the packet/record. We must be careful
1108 * to cope with writespace callbacks arriving _after_ we have
1109 * called sendmsg(). */
1110 req->rq_xtime = ktime_get();
1111 tcp_sock_set_cork(transport->inet, true);
1112
1113 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1114
1115 do {
1116 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1117 transport->xmit.offset, rm, &sent);
1118
1119 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1120 xdr->len - transport->xmit.offset, status);
1121
1122 /* If we've sent the entire packet, immediately
1123 * reset the count of bytes sent. */
1124 transport->xmit.offset += sent;
1125 req->rq_bytes_sent = transport->xmit.offset;
1126 if (likely(req->rq_bytes_sent >= msglen)) {
1127 req->rq_xmit_bytes_sent += transport->xmit.offset;
1128 transport->xmit.offset = 0;
1129 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1130 tcp_sock_set_cork(transport->inet, false);
1131 return 0;
1132 }
1133
1134 WARN_ON_ONCE(sent == 0 && status == 0);
1135
1136 if (sent > 0)
1137 vm_wait = false;
1138
1139 } while (status == 0);
1140
1141 switch (status) {
1142 case -ENOTSOCK:
1143 status = -ENOTCONN;
1144 /* Should we call xs_close() here? */
1145 break;
1146 case -EAGAIN:
1147 status = xs_stream_nospace(req, vm_wait);
1148 break;
1149 case -ECONNRESET:
1150 case -ECONNREFUSED:
1151 case -ENOTCONN:
1152 case -EADDRINUSE:
1153 case -ENOBUFS:
1154 case -EPIPE:
1155 break;
1156 default:
1157 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1158 -status);
1159 }
1160
1161 return status;
1162 }
1163
xs_save_old_callbacks(struct sock_xprt * transport,struct sock * sk)1164 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1165 {
1166 transport->old_data_ready = sk->sk_data_ready;
1167 transport->old_state_change = sk->sk_state_change;
1168 transport->old_write_space = sk->sk_write_space;
1169 transport->old_error_report = sk->sk_error_report;
1170 }
1171
xs_restore_old_callbacks(struct sock_xprt * transport,struct sock * sk)1172 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1173 {
1174 sk->sk_data_ready = transport->old_data_ready;
1175 sk->sk_state_change = transport->old_state_change;
1176 sk->sk_write_space = transport->old_write_space;
1177 sk->sk_error_report = transport->old_error_report;
1178 }
1179
xs_sock_reset_state_flags(struct rpc_xprt * xprt)1180 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1181 {
1182 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1183
1184 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1185 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1186 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1187 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1188 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1189 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
1190 }
1191
xs_run_error_worker(struct sock_xprt * transport,unsigned int nr)1192 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1193 {
1194 set_bit(nr, &transport->sock_state);
1195 queue_work(xprtiod_workqueue, &transport->error_worker);
1196 }
1197
xs_sock_reset_connection_flags(struct rpc_xprt * xprt)1198 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1199 {
1200 xprt->connect_cookie++;
1201 smp_mb__before_atomic();
1202 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1203 clear_bit(XPRT_CLOSING, &xprt->state);
1204 xs_sock_reset_state_flags(xprt);
1205 smp_mb__after_atomic();
1206 }
1207
1208 /**
1209 * xs_error_report - callback to handle TCP socket state errors
1210 * @sk: socket
1211 *
1212 * Note: we don't call sock_error() since there may be a rpc_task
1213 * using the socket, and so we don't want to clear sk->sk_err.
1214 */
xs_error_report(struct sock * sk)1215 static void xs_error_report(struct sock *sk)
1216 {
1217 struct sock_xprt *transport;
1218 struct rpc_xprt *xprt;
1219
1220 if (!(xprt = xprt_from_sock(sk)))
1221 return;
1222
1223 transport = container_of(xprt, struct sock_xprt, xprt);
1224 transport->xprt_err = -sk->sk_err;
1225 if (transport->xprt_err == 0)
1226 return;
1227 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1228 xprt, -transport->xprt_err);
1229 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1230
1231 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1232 smp_mb__before_atomic();
1233 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1234 }
1235
xs_reset_transport(struct sock_xprt * transport)1236 static void xs_reset_transport(struct sock_xprt *transport)
1237 {
1238 struct socket *sock = transport->sock;
1239 struct sock *sk = transport->inet;
1240 struct rpc_xprt *xprt = &transport->xprt;
1241 struct file *filp = transport->file;
1242
1243 if (sk == NULL)
1244 return;
1245 /*
1246 * Make sure we're calling this in a context from which it is safe
1247 * to call __fput_sync(). In practice that means rpciod and the
1248 * system workqueue.
1249 */
1250 if (!(current->flags & PF_WQ_WORKER)) {
1251 WARN_ON_ONCE(1);
1252 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1253 return;
1254 }
1255
1256 if (atomic_read(&transport->xprt.swapper))
1257 sk_clear_memalloc(sk);
1258
1259 tls_handshake_cancel(sk);
1260
1261 kernel_sock_shutdown(sock, SHUT_RDWR);
1262
1263 mutex_lock(&transport->recv_mutex);
1264 lock_sock(sk);
1265 transport->inet = NULL;
1266 transport->sock = NULL;
1267 transport->file = NULL;
1268
1269 sk->sk_user_data = NULL;
1270
1271 xs_restore_old_callbacks(transport, sk);
1272 xprt_clear_connected(xprt);
1273 xs_sock_reset_connection_flags(xprt);
1274 /* Reset stream record info */
1275 xs_stream_reset_connect(transport);
1276 release_sock(sk);
1277 mutex_unlock(&transport->recv_mutex);
1278
1279 trace_rpc_socket_close(xprt, sock);
1280 __fput_sync(filp);
1281
1282 xprt_disconnect_done(xprt);
1283 }
1284
1285 /**
1286 * xs_close - close a socket
1287 * @xprt: transport
1288 *
1289 * This is used when all requests are complete; ie, no DRC state remains
1290 * on the server we want to save.
1291 *
1292 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1293 * xs_reset_transport() zeroing the socket from underneath a writer.
1294 */
xs_close(struct rpc_xprt * xprt)1295 static void xs_close(struct rpc_xprt *xprt)
1296 {
1297 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1298
1299 dprintk("RPC: xs_close xprt %p\n", xprt);
1300
1301 if (transport->sock)
1302 tls_handshake_close(transport->sock);
1303 xs_reset_transport(transport);
1304 xprt->reestablish_timeout = 0;
1305 }
1306
xs_inject_disconnect(struct rpc_xprt * xprt)1307 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1308 {
1309 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1310 xprt);
1311 xprt_disconnect_done(xprt);
1312 }
1313
xs_xprt_free(struct rpc_xprt * xprt)1314 static void xs_xprt_free(struct rpc_xprt *xprt)
1315 {
1316 xs_free_peer_addresses(xprt);
1317 xprt_free(xprt);
1318 }
1319
1320 /**
1321 * xs_destroy - prepare to shutdown a transport
1322 * @xprt: doomed transport
1323 *
1324 */
xs_destroy(struct rpc_xprt * xprt)1325 static void xs_destroy(struct rpc_xprt *xprt)
1326 {
1327 struct sock_xprt *transport = container_of(xprt,
1328 struct sock_xprt, xprt);
1329 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1330
1331 cancel_delayed_work_sync(&transport->connect_worker);
1332 xs_close(xprt);
1333 cancel_work_sync(&transport->recv_worker);
1334 cancel_work_sync(&transport->error_worker);
1335 xs_xprt_free(xprt);
1336 module_put(THIS_MODULE);
1337 }
1338
1339 /**
1340 * xs_udp_data_read_skb - receive callback for UDP sockets
1341 * @xprt: transport
1342 * @sk: socket
1343 * @skb: skbuff
1344 *
1345 */
xs_udp_data_read_skb(struct rpc_xprt * xprt,struct sock * sk,struct sk_buff * skb)1346 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1347 struct sock *sk,
1348 struct sk_buff *skb)
1349 {
1350 struct rpc_task *task;
1351 struct rpc_rqst *rovr;
1352 int repsize, copied;
1353 u32 _xid;
1354 __be32 *xp;
1355
1356 repsize = skb->len;
1357 if (repsize < 4) {
1358 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1359 return;
1360 }
1361
1362 /* Copy the XID from the skb... */
1363 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1364 if (xp == NULL)
1365 return;
1366
1367 /* Look up and lock the request corresponding to the given XID */
1368 spin_lock(&xprt->queue_lock);
1369 rovr = xprt_lookup_rqst(xprt, *xp);
1370 if (!rovr)
1371 goto out_unlock;
1372 xprt_pin_rqst(rovr);
1373 xprt_update_rtt(rovr->rq_task);
1374 spin_unlock(&xprt->queue_lock);
1375 task = rovr->rq_task;
1376
1377 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1378 copied = repsize;
1379
1380 /* Suck it into the iovec, verify checksum if not done by hw. */
1381 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1382 spin_lock(&xprt->queue_lock);
1383 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1384 goto out_unpin;
1385 }
1386
1387
1388 spin_lock(&xprt->transport_lock);
1389 xprt_adjust_cwnd(xprt, task, copied);
1390 spin_unlock(&xprt->transport_lock);
1391 spin_lock(&xprt->queue_lock);
1392 xprt_complete_rqst(task, copied);
1393 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1394 out_unpin:
1395 xprt_unpin_rqst(rovr);
1396 out_unlock:
1397 spin_unlock(&xprt->queue_lock);
1398 }
1399
xs_udp_data_receive(struct sock_xprt * transport)1400 static void xs_udp_data_receive(struct sock_xprt *transport)
1401 {
1402 struct sk_buff *skb;
1403 struct sock *sk;
1404 int err;
1405
1406 mutex_lock(&transport->recv_mutex);
1407 sk = transport->inet;
1408 if (sk == NULL)
1409 goto out;
1410 for (;;) {
1411 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1412 if (skb == NULL)
1413 break;
1414 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1415 consume_skb(skb);
1416 cond_resched();
1417 }
1418 xs_poll_check_readable(transport);
1419 out:
1420 mutex_unlock(&transport->recv_mutex);
1421 }
1422
xs_udp_data_receive_workfn(struct work_struct * work)1423 static void xs_udp_data_receive_workfn(struct work_struct *work)
1424 {
1425 struct sock_xprt *transport =
1426 container_of(work, struct sock_xprt, recv_worker);
1427 unsigned int pflags = memalloc_nofs_save();
1428
1429 xs_udp_data_receive(transport);
1430 memalloc_nofs_restore(pflags);
1431 }
1432
1433 /**
1434 * xs_data_ready - "data ready" callback for sockets
1435 * @sk: socket with data to read
1436 *
1437 */
xs_data_ready(struct sock * sk)1438 static void xs_data_ready(struct sock *sk)
1439 {
1440 struct rpc_xprt *xprt;
1441
1442 trace_sk_data_ready(sk);
1443
1444 xprt = xprt_from_sock(sk);
1445 if (xprt != NULL) {
1446 struct sock_xprt *transport = container_of(xprt,
1447 struct sock_xprt, xprt);
1448
1449 trace_xs_data_ready(xprt);
1450
1451 transport->old_data_ready(sk);
1452
1453 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1454 return;
1455
1456 /* Any data means we had a useful conversation, so
1457 * then we don't need to delay the next reconnect
1458 */
1459 if (xprt->reestablish_timeout)
1460 xprt->reestablish_timeout = 0;
1461 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1462 queue_work(xprtiod_workqueue, &transport->recv_worker);
1463 }
1464 }
1465
1466 /*
1467 * Helper function to force a TCP close if the server is sending
1468 * junk and/or it has put us in CLOSE_WAIT
1469 */
xs_tcp_force_close(struct rpc_xprt * xprt)1470 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1471 {
1472 xprt_force_disconnect(xprt);
1473 }
1474
1475 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
xs_tcp_bc_maxpayload(struct rpc_xprt * xprt)1476 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1477 {
1478 return PAGE_SIZE;
1479 }
1480 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1481
1482 /**
1483 * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1484 * @sk: socket whose state has changed
1485 *
1486 */
xs_local_state_change(struct sock * sk)1487 static void xs_local_state_change(struct sock *sk)
1488 {
1489 struct rpc_xprt *xprt;
1490 struct sock_xprt *transport;
1491
1492 if (!(xprt = xprt_from_sock(sk)))
1493 return;
1494 transport = container_of(xprt, struct sock_xprt, xprt);
1495 if (sk->sk_shutdown & SHUTDOWN_MASK) {
1496 clear_bit(XPRT_CONNECTED, &xprt->state);
1497 /* Trigger the socket release */
1498 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1499 }
1500 }
1501
1502 /**
1503 * xs_tcp_state_change - callback to handle TCP socket state changes
1504 * @sk: socket whose state has changed
1505 *
1506 */
xs_tcp_state_change(struct sock * sk)1507 static void xs_tcp_state_change(struct sock *sk)
1508 {
1509 struct rpc_xprt *xprt;
1510 struct sock_xprt *transport;
1511
1512 if (!(xprt = xprt_from_sock(sk)))
1513 return;
1514 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1515 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1516 sk->sk_state, xprt_connected(xprt),
1517 sock_flag(sk, SOCK_DEAD),
1518 sock_flag(sk, SOCK_ZAPPED),
1519 sk->sk_shutdown);
1520
1521 transport = container_of(xprt, struct sock_xprt, xprt);
1522 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1523 switch (sk->sk_state) {
1524 case TCP_ESTABLISHED:
1525 if (!xprt_test_and_set_connected(xprt)) {
1526 xprt->connect_cookie++;
1527 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1528 xprt_clear_connecting(xprt);
1529
1530 xprt->stat.connect_count++;
1531 xprt->stat.connect_time += (long)jiffies -
1532 xprt->stat.connect_start;
1533 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1534 }
1535 break;
1536 case TCP_FIN_WAIT1:
1537 /* The client initiated a shutdown of the socket */
1538 xprt->connect_cookie++;
1539 xprt->reestablish_timeout = 0;
1540 set_bit(XPRT_CLOSING, &xprt->state);
1541 smp_mb__before_atomic();
1542 clear_bit(XPRT_CONNECTED, &xprt->state);
1543 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1544 smp_mb__after_atomic();
1545 break;
1546 case TCP_CLOSE_WAIT:
1547 /* The server initiated a shutdown of the socket */
1548 xprt->connect_cookie++;
1549 clear_bit(XPRT_CONNECTED, &xprt->state);
1550 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1551 fallthrough;
1552 case TCP_CLOSING:
1553 /*
1554 * If the server closed down the connection, make sure that
1555 * we back off before reconnecting
1556 */
1557 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1558 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1559 break;
1560 case TCP_LAST_ACK:
1561 set_bit(XPRT_CLOSING, &xprt->state);
1562 smp_mb__before_atomic();
1563 clear_bit(XPRT_CONNECTED, &xprt->state);
1564 smp_mb__after_atomic();
1565 break;
1566 case TCP_CLOSE:
1567 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1568 &transport->sock_state))
1569 xprt_clear_connecting(xprt);
1570 clear_bit(XPRT_CLOSING, &xprt->state);
1571 /* Trigger the socket release */
1572 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1573 }
1574 }
1575
xs_write_space(struct sock * sk)1576 static void xs_write_space(struct sock *sk)
1577 {
1578 struct sock_xprt *transport;
1579 struct rpc_xprt *xprt;
1580
1581 if (!sk->sk_socket)
1582 return;
1583 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1584
1585 if (unlikely(!(xprt = xprt_from_sock(sk))))
1586 return;
1587 transport = container_of(xprt, struct sock_xprt, xprt);
1588 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1589 return;
1590 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1591 sk->sk_write_pending--;
1592 }
1593
1594 /**
1595 * xs_udp_write_space - callback invoked when socket buffer space
1596 * becomes available
1597 * @sk: socket whose state has changed
1598 *
1599 * Called when more output buffer space is available for this socket.
1600 * We try not to wake our writers until they can make "significant"
1601 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1602 * with a bunch of small requests.
1603 */
xs_udp_write_space(struct sock * sk)1604 static void xs_udp_write_space(struct sock *sk)
1605 {
1606 /* from net/core/sock.c:sock_def_write_space */
1607 if (sock_writeable(sk))
1608 xs_write_space(sk);
1609 }
1610
1611 /**
1612 * xs_tcp_write_space - callback invoked when socket buffer space
1613 * becomes available
1614 * @sk: socket whose state has changed
1615 *
1616 * Called when more output buffer space is available for this socket.
1617 * We try not to wake our writers until they can make "significant"
1618 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1619 * with a bunch of small requests.
1620 */
xs_tcp_write_space(struct sock * sk)1621 static void xs_tcp_write_space(struct sock *sk)
1622 {
1623 /* from net/core/stream.c:sk_stream_write_space */
1624 if (sk_stream_is_writeable(sk))
1625 xs_write_space(sk);
1626 }
1627
xs_udp_do_set_buffer_size(struct rpc_xprt * xprt)1628 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1629 {
1630 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1631 struct sock *sk = transport->inet;
1632
1633 if (transport->rcvsize) {
1634 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1635 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1636 }
1637 if (transport->sndsize) {
1638 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1639 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1640 sk->sk_write_space(sk);
1641 }
1642 }
1643
1644 /**
1645 * xs_udp_set_buffer_size - set send and receive limits
1646 * @xprt: generic transport
1647 * @sndsize: requested size of send buffer, in bytes
1648 * @rcvsize: requested size of receive buffer, in bytes
1649 *
1650 * Set socket send and receive buffer size limits.
1651 */
xs_udp_set_buffer_size(struct rpc_xprt * xprt,size_t sndsize,size_t rcvsize)1652 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1653 {
1654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1655
1656 transport->sndsize = 0;
1657 if (sndsize)
1658 transport->sndsize = sndsize + 1024;
1659 transport->rcvsize = 0;
1660 if (rcvsize)
1661 transport->rcvsize = rcvsize + 1024;
1662
1663 xs_udp_do_set_buffer_size(xprt);
1664 }
1665
1666 /**
1667 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1668 * @xprt: controlling transport
1669 * @task: task that timed out
1670 *
1671 * Adjust the congestion window after a retransmit timeout has occurred.
1672 */
xs_udp_timer(struct rpc_xprt * xprt,struct rpc_task * task)1673 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1674 {
1675 spin_lock(&xprt->transport_lock);
1676 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1677 spin_unlock(&xprt->transport_lock);
1678 }
1679
xs_get_random_port(void)1680 static int xs_get_random_port(void)
1681 {
1682 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1683 unsigned short range;
1684 unsigned short rand;
1685
1686 if (max < min)
1687 return -EADDRINUSE;
1688 range = max - min + 1;
1689 rand = get_random_u32_below(range);
1690 return rand + min;
1691 }
1692
xs_sock_getport(struct socket * sock)1693 static unsigned short xs_sock_getport(struct socket *sock)
1694 {
1695 struct sockaddr_storage buf;
1696 unsigned short port = 0;
1697
1698 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1699 goto out;
1700 switch (buf.ss_family) {
1701 case AF_INET6:
1702 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1703 break;
1704 case AF_INET:
1705 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1706 }
1707 out:
1708 return port;
1709 }
1710
1711 /**
1712 * xs_set_port - reset the port number in the remote endpoint address
1713 * @xprt: generic transport
1714 * @port: new port number
1715 *
1716 */
xs_set_port(struct rpc_xprt * xprt,unsigned short port)1717 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1718 {
1719 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1720
1721 rpc_set_port(xs_addr(xprt), port);
1722 xs_update_peer_port(xprt);
1723 }
1724
xs_set_srcport(struct sock_xprt * transport,struct socket * sock)1725 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1726 {
1727 if (transport->srcport == 0 && transport->xprt.reuseport)
1728 transport->srcport = xs_sock_getport(sock);
1729 }
1730
xs_get_srcport(struct sock_xprt * transport)1731 static int xs_get_srcport(struct sock_xprt *transport)
1732 {
1733 int port = transport->srcport;
1734
1735 if (port == 0 && transport->xprt.resvport)
1736 port = xs_get_random_port();
1737 return port;
1738 }
1739
xs_sock_srcport(struct rpc_xprt * xprt)1740 static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1741 {
1742 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1743 unsigned short ret = 0;
1744 mutex_lock(&sock->recv_mutex);
1745 if (sock->sock)
1746 ret = xs_sock_getport(sock->sock);
1747 mutex_unlock(&sock->recv_mutex);
1748 return ret;
1749 }
1750
xs_sock_srcaddr(struct rpc_xprt * xprt,char * buf,size_t buflen)1751 static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1752 {
1753 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1754 union {
1755 struct sockaddr sa;
1756 struct sockaddr_storage st;
1757 } saddr;
1758 int ret = -ENOTCONN;
1759
1760 mutex_lock(&sock->recv_mutex);
1761 if (sock->sock) {
1762 ret = kernel_getsockname(sock->sock, &saddr.sa);
1763 if (ret >= 0)
1764 ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1765 }
1766 mutex_unlock(&sock->recv_mutex);
1767 return ret;
1768 }
1769
xs_next_srcport(struct sock_xprt * transport,unsigned short port)1770 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1771 {
1772 if (transport->srcport != 0)
1773 transport->srcport = 0;
1774 if (!transport->xprt.resvport)
1775 return 0;
1776 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1777 return xprt_max_resvport;
1778 return --port;
1779 }
xs_bind(struct sock_xprt * transport,struct socket * sock)1780 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1781 {
1782 struct sockaddr_storage myaddr;
1783 int err, nloop = 0;
1784 int port = xs_get_srcport(transport);
1785 unsigned short last;
1786
1787 /*
1788 * If we are asking for any ephemeral port (i.e. port == 0 &&
1789 * transport->xprt.resvport == 0), don't bind. Let the local
1790 * port selection happen implicitly when the socket is used
1791 * (for example at connect time).
1792 *
1793 * This ensures that we can continue to establish TCP
1794 * connections even when all local ephemeral ports are already
1795 * a part of some TCP connection. This makes no difference
1796 * for UDP sockets, but also doesn't harm them.
1797 *
1798 * If we're asking for any reserved port (i.e. port == 0 &&
1799 * transport->xprt.resvport == 1) xs_get_srcport above will
1800 * ensure that port is non-zero and we will bind as needed.
1801 */
1802 if (port <= 0)
1803 return port;
1804
1805 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1806 do {
1807 rpc_set_port((struct sockaddr *)&myaddr, port);
1808 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1809 transport->xprt.addrlen);
1810 if (err == 0) {
1811 if (transport->xprt.reuseport)
1812 transport->srcport = port;
1813 break;
1814 }
1815 last = port;
1816 port = xs_next_srcport(transport, port);
1817 if (port > last)
1818 nloop++;
1819 } while (err == -EADDRINUSE && nloop != 2);
1820
1821 if (myaddr.ss_family == AF_INET)
1822 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1823 &((struct sockaddr_in *)&myaddr)->sin_addr,
1824 port, err ? "failed" : "ok", err);
1825 else
1826 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1827 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1828 port, err ? "failed" : "ok", err);
1829 return err;
1830 }
1831
1832 /*
1833 * We don't support autobind on AF_LOCAL sockets
1834 */
xs_local_rpcbind(struct rpc_task * task)1835 static void xs_local_rpcbind(struct rpc_task *task)
1836 {
1837 xprt_set_bound(task->tk_xprt);
1838 }
1839
xs_local_set_port(struct rpc_xprt * xprt,unsigned short port)1840 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1841 {
1842 }
1843
1844 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1845 static struct lock_class_key xs_key[3];
1846 static struct lock_class_key xs_slock_key[3];
1847
xs_reclassify_socketu(struct socket * sock)1848 static inline void xs_reclassify_socketu(struct socket *sock)
1849 {
1850 struct sock *sk = sock->sk;
1851
1852 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1853 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1854 }
1855
xs_reclassify_socket4(struct socket * sock)1856 static inline void xs_reclassify_socket4(struct socket *sock)
1857 {
1858 struct sock *sk = sock->sk;
1859
1860 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1861 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1862 }
1863
xs_reclassify_socket6(struct socket * sock)1864 static inline void xs_reclassify_socket6(struct socket *sock)
1865 {
1866 struct sock *sk = sock->sk;
1867
1868 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1869 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1870 }
1871
xs_reclassify_socket(int family,struct socket * sock)1872 static inline void xs_reclassify_socket(int family, struct socket *sock)
1873 {
1874 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1875 return;
1876
1877 switch (family) {
1878 case AF_LOCAL:
1879 xs_reclassify_socketu(sock);
1880 break;
1881 case AF_INET:
1882 xs_reclassify_socket4(sock);
1883 break;
1884 case AF_INET6:
1885 xs_reclassify_socket6(sock);
1886 break;
1887 }
1888 }
1889 #else
xs_reclassify_socket(int family,struct socket * sock)1890 static inline void xs_reclassify_socket(int family, struct socket *sock)
1891 {
1892 }
1893 #endif
1894
xs_dummy_setup_socket(struct work_struct * work)1895 static void xs_dummy_setup_socket(struct work_struct *work)
1896 {
1897 }
1898
xs_create_sock(struct rpc_xprt * xprt,struct sock_xprt * transport,int family,int type,int protocol,bool reuseport)1899 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1900 struct sock_xprt *transport, int family, int type,
1901 int protocol, bool reuseport)
1902 {
1903 struct file *filp;
1904 struct socket *sock;
1905 int err;
1906
1907 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1908 if (err < 0) {
1909 dprintk("RPC: can't create %d transport socket (%d).\n",
1910 protocol, -err);
1911 goto out;
1912 }
1913 xs_reclassify_socket(family, sock);
1914
1915 if (reuseport)
1916 sock_set_reuseport(sock->sk);
1917
1918 err = xs_bind(transport, sock);
1919 if (err) {
1920 sock_release(sock);
1921 goto out;
1922 }
1923
1924 if (protocol == IPPROTO_TCP) {
1925 __netns_tracker_free(xprt->xprt_net, &sock->sk->ns_tracker, false);
1926 sock->sk->sk_net_refcnt = 1;
1927 get_net_track(xprt->xprt_net, &sock->sk->ns_tracker, GFP_KERNEL);
1928 sock_inuse_add(xprt->xprt_net, 1);
1929 }
1930
1931 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1932 if (IS_ERR(filp))
1933 return ERR_CAST(filp);
1934 transport->file = filp;
1935
1936 return sock;
1937 out:
1938 return ERR_PTR(err);
1939 }
1940
xs_local_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)1941 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1942 struct socket *sock)
1943 {
1944 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1945 xprt);
1946
1947 if (!transport->inet) {
1948 struct sock *sk = sock->sk;
1949
1950 lock_sock(sk);
1951
1952 xs_save_old_callbacks(transport, sk);
1953
1954 sk->sk_user_data = xprt;
1955 sk->sk_data_ready = xs_data_ready;
1956 sk->sk_write_space = xs_udp_write_space;
1957 sk->sk_state_change = xs_local_state_change;
1958 sk->sk_error_report = xs_error_report;
1959 sk->sk_use_task_frag = false;
1960
1961 xprt_clear_connected(xprt);
1962
1963 /* Reset to new socket */
1964 transport->sock = sock;
1965 transport->inet = sk;
1966
1967 release_sock(sk);
1968 }
1969
1970 xs_stream_start_connect(transport);
1971
1972 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1973 }
1974
1975 /**
1976 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1977 * @transport: socket transport to connect
1978 */
xs_local_setup_socket(struct sock_xprt * transport)1979 static int xs_local_setup_socket(struct sock_xprt *transport)
1980 {
1981 struct rpc_xprt *xprt = &transport->xprt;
1982 struct file *filp;
1983 struct socket *sock;
1984 int status;
1985
1986 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1987 SOCK_STREAM, 0, &sock, 1);
1988 if (status < 0) {
1989 dprintk("RPC: can't create AF_LOCAL "
1990 "transport socket (%d).\n", -status);
1991 goto out;
1992 }
1993 xs_reclassify_socket(AF_LOCAL, sock);
1994
1995 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1996 if (IS_ERR(filp)) {
1997 status = PTR_ERR(filp);
1998 goto out;
1999 }
2000 transport->file = filp;
2001
2002 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2003 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2004
2005 status = xs_local_finish_connecting(xprt, sock);
2006 trace_rpc_socket_connect(xprt, sock, status);
2007 switch (status) {
2008 case 0:
2009 dprintk("RPC: xprt %p connected to %s\n",
2010 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2011 xprt->stat.connect_count++;
2012 xprt->stat.connect_time += (long)jiffies -
2013 xprt->stat.connect_start;
2014 xprt_set_connected(xprt);
2015 break;
2016 case -ENOBUFS:
2017 break;
2018 case -ENOENT:
2019 dprintk("RPC: xprt %p: socket %s does not exist\n",
2020 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2021 break;
2022 case -ECONNREFUSED:
2023 dprintk("RPC: xprt %p: connection refused for %s\n",
2024 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2025 break;
2026 default:
2027 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2028 __func__, -status,
2029 xprt->address_strings[RPC_DISPLAY_ADDR]);
2030 }
2031
2032 out:
2033 xprt_clear_connecting(xprt);
2034 xprt_wake_pending_tasks(xprt, status);
2035 return status;
2036 }
2037
xs_local_connect(struct rpc_xprt * xprt,struct rpc_task * task)2038 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2039 {
2040 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2041 int ret;
2042
2043 if (transport->file)
2044 goto force_disconnect;
2045
2046 if (RPC_IS_ASYNC(task)) {
2047 /*
2048 * We want the AF_LOCAL connect to be resolved in the
2049 * filesystem namespace of the process making the rpc
2050 * call. Thus we connect synchronously.
2051 *
2052 * If we want to support asynchronous AF_LOCAL calls,
2053 * we'll need to figure out how to pass a namespace to
2054 * connect.
2055 */
2056 rpc_task_set_rpc_status(task, -ENOTCONN);
2057 goto out_wake;
2058 }
2059 ret = xs_local_setup_socket(transport);
2060 if (ret && !RPC_IS_SOFTCONN(task))
2061 msleep_interruptible(15000);
2062 return;
2063 force_disconnect:
2064 xprt_force_disconnect(xprt);
2065 out_wake:
2066 xprt_clear_connecting(xprt);
2067 xprt_wake_pending_tasks(xprt, -ENOTCONN);
2068 }
2069
2070 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2071 /*
2072 * Note that this should be called with XPRT_LOCKED held, or recv_mutex
2073 * held, or when we otherwise know that we have exclusive access to the
2074 * socket, to guard against races with xs_reset_transport.
2075 */
xs_set_memalloc(struct rpc_xprt * xprt)2076 static void xs_set_memalloc(struct rpc_xprt *xprt)
2077 {
2078 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2079 xprt);
2080
2081 /*
2082 * If there's no sock, then we have nothing to set. The
2083 * reconnecting process will get it for us.
2084 */
2085 if (!transport->inet)
2086 return;
2087 if (atomic_read(&xprt->swapper))
2088 sk_set_memalloc(transport->inet);
2089 }
2090
2091 /**
2092 * xs_enable_swap - Tag this transport as being used for swap.
2093 * @xprt: transport to tag
2094 *
2095 * Take a reference to this transport on behalf of the rpc_clnt, and
2096 * optionally mark it for swapping if it wasn't already.
2097 */
2098 static int
xs_enable_swap(struct rpc_xprt * xprt)2099 xs_enable_swap(struct rpc_xprt *xprt)
2100 {
2101 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2102
2103 mutex_lock(&xs->recv_mutex);
2104 if (atomic_inc_return(&xprt->swapper) == 1 &&
2105 xs->inet)
2106 sk_set_memalloc(xs->inet);
2107 mutex_unlock(&xs->recv_mutex);
2108 return 0;
2109 }
2110
2111 /**
2112 * xs_disable_swap - Untag this transport as being used for swap.
2113 * @xprt: transport to tag
2114 *
2115 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2116 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2117 */
2118 static void
xs_disable_swap(struct rpc_xprt * xprt)2119 xs_disable_swap(struct rpc_xprt *xprt)
2120 {
2121 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2122
2123 mutex_lock(&xs->recv_mutex);
2124 if (atomic_dec_and_test(&xprt->swapper) &&
2125 xs->inet)
2126 sk_clear_memalloc(xs->inet);
2127 mutex_unlock(&xs->recv_mutex);
2128 }
2129 #else
xs_set_memalloc(struct rpc_xprt * xprt)2130 static void xs_set_memalloc(struct rpc_xprt *xprt)
2131 {
2132 }
2133
2134 static int
xs_enable_swap(struct rpc_xprt * xprt)2135 xs_enable_swap(struct rpc_xprt *xprt)
2136 {
2137 return -EINVAL;
2138 }
2139
2140 static void
xs_disable_swap(struct rpc_xprt * xprt)2141 xs_disable_swap(struct rpc_xprt *xprt)
2142 {
2143 }
2144 #endif
2145
xs_udp_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)2146 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2147 {
2148 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2149
2150 if (!transport->inet) {
2151 struct sock *sk = sock->sk;
2152
2153 lock_sock(sk);
2154
2155 xs_save_old_callbacks(transport, sk);
2156
2157 sk->sk_user_data = xprt;
2158 sk->sk_data_ready = xs_data_ready;
2159 sk->sk_write_space = xs_udp_write_space;
2160 sk->sk_use_task_frag = false;
2161
2162 xprt_set_connected(xprt);
2163
2164 /* Reset to new socket */
2165 transport->sock = sock;
2166 transport->inet = sk;
2167
2168 xs_set_memalloc(xprt);
2169
2170 release_sock(sk);
2171 }
2172 xs_udp_do_set_buffer_size(xprt);
2173
2174 xprt->stat.connect_start = jiffies;
2175 }
2176
xs_udp_setup_socket(struct work_struct * work)2177 static void xs_udp_setup_socket(struct work_struct *work)
2178 {
2179 struct sock_xprt *transport =
2180 container_of(work, struct sock_xprt, connect_worker.work);
2181 struct rpc_xprt *xprt = &transport->xprt;
2182 struct socket *sock;
2183 int status = -EIO;
2184 unsigned int pflags = current->flags;
2185
2186 if (atomic_read(&xprt->swapper))
2187 current->flags |= PF_MEMALLOC;
2188 sock = xs_create_sock(xprt, transport,
2189 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2190 IPPROTO_UDP, false);
2191 if (IS_ERR(sock))
2192 goto out;
2193
2194 dprintk("RPC: worker connecting xprt %p via %s to "
2195 "%s (port %s)\n", xprt,
2196 xprt->address_strings[RPC_DISPLAY_PROTO],
2197 xprt->address_strings[RPC_DISPLAY_ADDR],
2198 xprt->address_strings[RPC_DISPLAY_PORT]);
2199
2200 xs_udp_finish_connecting(xprt, sock);
2201 trace_rpc_socket_connect(xprt, sock, 0);
2202 status = 0;
2203 out:
2204 xprt_clear_connecting(xprt);
2205 xprt_unlock_connect(xprt, transport);
2206 xprt_wake_pending_tasks(xprt, status);
2207 current_restore_flags(pflags, PF_MEMALLOC);
2208 }
2209
2210 /**
2211 * xs_tcp_shutdown - gracefully shut down a TCP socket
2212 * @xprt: transport
2213 *
2214 * Initiates a graceful shutdown of the TCP socket by calling the
2215 * equivalent of shutdown(SHUT_RDWR);
2216 */
xs_tcp_shutdown(struct rpc_xprt * xprt)2217 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2218 {
2219 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2220 struct socket *sock = transport->sock;
2221 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2222
2223 if (sock == NULL)
2224 return;
2225 if (!xprt->reuseport) {
2226 xs_close(xprt);
2227 return;
2228 }
2229 switch (skst) {
2230 case TCP_FIN_WAIT1:
2231 case TCP_FIN_WAIT2:
2232 case TCP_LAST_ACK:
2233 break;
2234 case TCP_ESTABLISHED:
2235 case TCP_CLOSE_WAIT:
2236 kernel_sock_shutdown(sock, SHUT_RDWR);
2237 trace_rpc_socket_shutdown(xprt, sock);
2238 break;
2239 default:
2240 xs_reset_transport(transport);
2241 }
2242 }
2243
xs_tcp_set_socket_timeouts(struct rpc_xprt * xprt,struct socket * sock)2244 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2245 struct socket *sock)
2246 {
2247 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2248 struct net *net = sock_net(sock->sk);
2249 unsigned long connect_timeout;
2250 unsigned long syn_retries;
2251 unsigned int keepidle;
2252 unsigned int keepcnt;
2253 unsigned int timeo;
2254 unsigned long t;
2255
2256 spin_lock(&xprt->transport_lock);
2257 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2258 keepcnt = xprt->timeout->to_retries + 1;
2259 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2260 (xprt->timeout->to_retries + 1);
2261 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2262 spin_unlock(&xprt->transport_lock);
2263
2264 /* TCP Keepalive options */
2265 sock_set_keepalive(sock->sk);
2266 tcp_sock_set_keepidle(sock->sk, keepidle);
2267 tcp_sock_set_keepintvl(sock->sk, keepidle);
2268 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2269
2270 /* TCP user timeout (see RFC5482) */
2271 tcp_sock_set_user_timeout(sock->sk, timeo);
2272
2273 /* Connect timeout */
2274 connect_timeout = max_t(unsigned long,
2275 DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2276 syn_retries = max_t(unsigned long,
2277 READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2278 for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2279 ;
2280 if (t <= syn_retries)
2281 tcp_sock_set_syncnt(sock->sk, t - 1);
2282 }
2283
xs_tcp_do_set_connect_timeout(struct rpc_xprt * xprt,unsigned long connect_timeout)2284 static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2285 unsigned long connect_timeout)
2286 {
2287 struct sock_xprt *transport =
2288 container_of(xprt, struct sock_xprt, xprt);
2289 struct rpc_timeout to;
2290 unsigned long initval;
2291
2292 memcpy(&to, xprt->timeout, sizeof(to));
2293 /* Arbitrary lower limit */
2294 initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2295 to.to_initval = initval;
2296 to.to_maxval = initval;
2297 to.to_retries = 0;
2298 memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2299 xprt->timeout = &transport->tcp_timeout;
2300 xprt->connect_timeout = connect_timeout;
2301 }
2302
xs_tcp_set_connect_timeout(struct rpc_xprt * xprt,unsigned long connect_timeout,unsigned long reconnect_timeout)2303 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2304 unsigned long connect_timeout,
2305 unsigned long reconnect_timeout)
2306 {
2307 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2308
2309 spin_lock(&xprt->transport_lock);
2310 if (reconnect_timeout < xprt->max_reconnect_timeout)
2311 xprt->max_reconnect_timeout = reconnect_timeout;
2312 if (connect_timeout < xprt->connect_timeout)
2313 xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2314 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2315 spin_unlock(&xprt->transport_lock);
2316 }
2317
xs_tcp_finish_connecting(struct rpc_xprt * xprt,struct socket * sock)2318 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2319 {
2320 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2321
2322 if (!transport->inet) {
2323 struct sock *sk = sock->sk;
2324
2325 /* Avoid temporary address, they are bad for long-lived
2326 * connections such as NFS mounts.
2327 * RFC4941, section 3.6 suggests that:
2328 * Individual applications, which have specific
2329 * knowledge about the normal duration of connections,
2330 * MAY override this as appropriate.
2331 */
2332 if (xs_addr(xprt)->sa_family == PF_INET6) {
2333 ip6_sock_set_addr_preferences(sk,
2334 IPV6_PREFER_SRC_PUBLIC);
2335 }
2336
2337 xs_tcp_set_socket_timeouts(xprt, sock);
2338 tcp_sock_set_nodelay(sk);
2339
2340 lock_sock(sk);
2341
2342 xs_save_old_callbacks(transport, sk);
2343
2344 sk->sk_user_data = xprt;
2345 sk->sk_data_ready = xs_data_ready;
2346 sk->sk_state_change = xs_tcp_state_change;
2347 sk->sk_write_space = xs_tcp_write_space;
2348 sk->sk_error_report = xs_error_report;
2349 sk->sk_use_task_frag = false;
2350
2351 /* socket options */
2352 sock_reset_flag(sk, SOCK_LINGER);
2353
2354 xprt_clear_connected(xprt);
2355
2356 /* Reset to new socket */
2357 transport->sock = sock;
2358 transport->inet = sk;
2359
2360 release_sock(sk);
2361 }
2362
2363 if (!xprt_bound(xprt))
2364 return -ENOTCONN;
2365
2366 xs_set_memalloc(xprt);
2367
2368 xs_stream_start_connect(transport);
2369
2370 /* Tell the socket layer to start connecting... */
2371 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2372 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2373 }
2374
2375 /**
2376 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2377 * @work: queued work item
2378 *
2379 * Invoked by a work queue tasklet.
2380 */
xs_tcp_setup_socket(struct work_struct * work)2381 static void xs_tcp_setup_socket(struct work_struct *work)
2382 {
2383 struct sock_xprt *transport =
2384 container_of(work, struct sock_xprt, connect_worker.work);
2385 struct socket *sock = transport->sock;
2386 struct rpc_xprt *xprt = &transport->xprt;
2387 int status;
2388 unsigned int pflags = current->flags;
2389
2390 if (atomic_read(&xprt->swapper))
2391 current->flags |= PF_MEMALLOC;
2392
2393 if (xprt_connected(xprt))
2394 goto out;
2395 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2396 &transport->sock_state) ||
2397 !sock) {
2398 xs_reset_transport(transport);
2399 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2400 SOCK_STREAM, IPPROTO_TCP, true);
2401 if (IS_ERR(sock)) {
2402 xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2403 goto out;
2404 }
2405 }
2406
2407 dprintk("RPC: worker connecting xprt %p via %s to "
2408 "%s (port %s)\n", xprt,
2409 xprt->address_strings[RPC_DISPLAY_PROTO],
2410 xprt->address_strings[RPC_DISPLAY_ADDR],
2411 xprt->address_strings[RPC_DISPLAY_PORT]);
2412
2413 status = xs_tcp_finish_connecting(xprt, sock);
2414 trace_rpc_socket_connect(xprt, sock, status);
2415 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2416 xprt, -status, xprt_connected(xprt),
2417 sock->sk->sk_state);
2418 switch (status) {
2419 case 0:
2420 case -EINPROGRESS:
2421 /* SYN_SENT! */
2422 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2423 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2424 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2425 fallthrough;
2426 case -EALREADY:
2427 goto out_unlock;
2428 case -EADDRNOTAVAIL:
2429 /* Source port number is unavailable. Try a new one! */
2430 transport->srcport = 0;
2431 status = -EAGAIN;
2432 break;
2433 case -EPERM:
2434 /* Happens, for instance, if a BPF program is preventing
2435 * the connect. Remap the error so upper layers can better
2436 * deal with it.
2437 */
2438 status = -ECONNREFUSED;
2439 fallthrough;
2440 case -EINVAL:
2441 /* Happens, for instance, if the user specified a link
2442 * local IPv6 address without a scope-id.
2443 */
2444 case -ECONNREFUSED:
2445 case -ECONNRESET:
2446 case -ENETDOWN:
2447 case -ENETUNREACH:
2448 case -EHOSTUNREACH:
2449 case -EADDRINUSE:
2450 case -ENOBUFS:
2451 case -ENOTCONN:
2452 break;
2453 default:
2454 printk("%s: connect returned unhandled error %d\n",
2455 __func__, status);
2456 status = -EAGAIN;
2457 }
2458
2459 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2460 * We need to wake them first to ensure the correct error code.
2461 */
2462 xprt_wake_pending_tasks(xprt, status);
2463 xs_tcp_force_close(xprt);
2464 out:
2465 xprt_clear_connecting(xprt);
2466 out_unlock:
2467 xprt_unlock_connect(xprt, transport);
2468 current_restore_flags(pflags, PF_MEMALLOC);
2469 }
2470
2471 /*
2472 * Transfer the connected socket to @upper_transport, then mark that
2473 * xprt CONNECTED.
2474 */
xs_tcp_tls_finish_connecting(struct rpc_xprt * lower_xprt,struct sock_xprt * upper_transport)2475 static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2476 struct sock_xprt *upper_transport)
2477 {
2478 struct sock_xprt *lower_transport =
2479 container_of(lower_xprt, struct sock_xprt, xprt);
2480 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2481
2482 if (!upper_transport->inet) {
2483 struct socket *sock = lower_transport->sock;
2484 struct sock *sk = sock->sk;
2485
2486 /* Avoid temporary address, they are bad for long-lived
2487 * connections such as NFS mounts.
2488 * RFC4941, section 3.6 suggests that:
2489 * Individual applications, which have specific
2490 * knowledge about the normal duration of connections,
2491 * MAY override this as appropriate.
2492 */
2493 if (xs_addr(upper_xprt)->sa_family == PF_INET6)
2494 ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2495
2496 xs_tcp_set_socket_timeouts(upper_xprt, sock);
2497 tcp_sock_set_nodelay(sk);
2498
2499 lock_sock(sk);
2500
2501 /* @sk is already connected, so it now has the RPC callbacks.
2502 * Reach into @lower_transport to save the original ones.
2503 */
2504 upper_transport->old_data_ready = lower_transport->old_data_ready;
2505 upper_transport->old_state_change = lower_transport->old_state_change;
2506 upper_transport->old_write_space = lower_transport->old_write_space;
2507 upper_transport->old_error_report = lower_transport->old_error_report;
2508 sk->sk_user_data = upper_xprt;
2509
2510 /* socket options */
2511 sock_reset_flag(sk, SOCK_LINGER);
2512
2513 xprt_clear_connected(upper_xprt);
2514
2515 upper_transport->sock = sock;
2516 upper_transport->inet = sk;
2517 upper_transport->file = lower_transport->file;
2518
2519 release_sock(sk);
2520
2521 /* Reset lower_transport before shutting down its clnt */
2522 mutex_lock(&lower_transport->recv_mutex);
2523 lower_transport->inet = NULL;
2524 lower_transport->sock = NULL;
2525 lower_transport->file = NULL;
2526
2527 xprt_clear_connected(lower_xprt);
2528 xs_sock_reset_connection_flags(lower_xprt);
2529 xs_stream_reset_connect(lower_transport);
2530 mutex_unlock(&lower_transport->recv_mutex);
2531 }
2532
2533 if (!xprt_bound(upper_xprt))
2534 return -ENOTCONN;
2535
2536 xs_set_memalloc(upper_xprt);
2537
2538 if (!xprt_test_and_set_connected(upper_xprt)) {
2539 upper_xprt->connect_cookie++;
2540 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2541 xprt_clear_connecting(upper_xprt);
2542
2543 upper_xprt->stat.connect_count++;
2544 upper_xprt->stat.connect_time += (long)jiffies -
2545 upper_xprt->stat.connect_start;
2546 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2547 }
2548 return 0;
2549 }
2550
2551 /**
2552 * xs_tls_handshake_done - TLS handshake completion handler
2553 * @data: address of xprt to wake
2554 * @status: status of handshake
2555 * @peerid: serial number of key containing the remote's identity
2556 *
2557 */
xs_tls_handshake_done(void * data,int status,key_serial_t peerid)2558 static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2559 {
2560 struct rpc_xprt *lower_xprt = data;
2561 struct sock_xprt *lower_transport =
2562 container_of(lower_xprt, struct sock_xprt, xprt);
2563
2564 lower_transport->xprt_err = status ? -EACCES : 0;
2565 complete(&lower_transport->handshake_done);
2566 xprt_put(lower_xprt);
2567 }
2568
xs_tls_handshake_sync(struct rpc_xprt * lower_xprt,struct xprtsec_parms * xprtsec)2569 static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2570 {
2571 struct sock_xprt *lower_transport =
2572 container_of(lower_xprt, struct sock_xprt, xprt);
2573 struct tls_handshake_args args = {
2574 .ta_sock = lower_transport->sock,
2575 .ta_done = xs_tls_handshake_done,
2576 .ta_data = xprt_get(lower_xprt),
2577 .ta_peername = lower_xprt->servername,
2578 };
2579 struct sock *sk = lower_transport->inet;
2580 int rc;
2581
2582 init_completion(&lower_transport->handshake_done);
2583 set_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2584 lower_transport->xprt_err = -ETIMEDOUT;
2585 switch (xprtsec->policy) {
2586 case RPC_XPRTSEC_TLS_ANON:
2587 rc = tls_client_hello_anon(&args, GFP_KERNEL);
2588 if (rc)
2589 goto out_put_xprt;
2590 break;
2591 case RPC_XPRTSEC_TLS_X509:
2592 args.ta_my_cert = xprtsec->cert_serial;
2593 args.ta_my_privkey = xprtsec->privkey_serial;
2594 rc = tls_client_hello_x509(&args, GFP_KERNEL);
2595 if (rc)
2596 goto out_put_xprt;
2597 break;
2598 default:
2599 rc = -EACCES;
2600 goto out_put_xprt;
2601 }
2602
2603 rc = wait_for_completion_interruptible_timeout(&lower_transport->handshake_done,
2604 XS_TLS_HANDSHAKE_TO);
2605 if (rc <= 0) {
2606 tls_handshake_cancel(sk);
2607 if (rc == 0)
2608 rc = -ETIMEDOUT;
2609 goto out_put_xprt;
2610 }
2611
2612 rc = lower_transport->xprt_err;
2613
2614 out:
2615 xs_stream_reset_connect(lower_transport);
2616 clear_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2617 return rc;
2618
2619 out_put_xprt:
2620 xprt_put(lower_xprt);
2621 goto out;
2622 }
2623
2624 /**
2625 * xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2626 * @work: queued work item
2627 *
2628 * Invoked by a work queue tasklet.
2629 *
2630 * For RPC-with-TLS, there is a two-stage connection process.
2631 *
2632 * The "upper-layer xprt" is visible to the RPC consumer. Once it has
2633 * been marked connected, the consumer knows that a TCP connection and
2634 * a TLS session have been established.
2635 *
2636 * A "lower-layer xprt", created in this function, handles the mechanics
2637 * of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2638 * then driving the TLS handshake. Once all that is complete, the upper
2639 * layer xprt is marked connected.
2640 */
xs_tcp_tls_setup_socket(struct work_struct * work)2641 static void xs_tcp_tls_setup_socket(struct work_struct *work)
2642 {
2643 struct sock_xprt *upper_transport =
2644 container_of(work, struct sock_xprt, connect_worker.work);
2645 struct rpc_clnt *upper_clnt = upper_transport->clnt;
2646 struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2647 struct rpc_create_args args = {
2648 .net = upper_xprt->xprt_net,
2649 .protocol = upper_xprt->prot,
2650 .address = (struct sockaddr *)&upper_xprt->addr,
2651 .addrsize = upper_xprt->addrlen,
2652 .timeout = upper_clnt->cl_timeout,
2653 .servername = upper_xprt->servername,
2654 .program = upper_clnt->cl_program,
2655 .prognumber = upper_clnt->cl_prog,
2656 .version = upper_clnt->cl_vers,
2657 .authflavor = RPC_AUTH_TLS,
2658 .cred = upper_clnt->cl_cred,
2659 .xprtsec = {
2660 .policy = RPC_XPRTSEC_NONE,
2661 },
2662 .stats = upper_clnt->cl_stats,
2663 };
2664 unsigned int pflags = current->flags;
2665 struct rpc_clnt *lower_clnt;
2666 struct rpc_xprt *lower_xprt;
2667 int status;
2668
2669 if (atomic_read(&upper_xprt->swapper))
2670 current->flags |= PF_MEMALLOC;
2671
2672 xs_stream_start_connect(upper_transport);
2673
2674 /* This implicitly sends an RPC_AUTH_TLS probe */
2675 lower_clnt = rpc_create(&args);
2676 if (IS_ERR(lower_clnt)) {
2677 trace_rpc_tls_unavailable(upper_clnt, upper_xprt);
2678 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2679 xprt_clear_connecting(upper_xprt);
2680 xprt_wake_pending_tasks(upper_xprt, PTR_ERR(lower_clnt));
2681 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2682 goto out_unlock;
2683 }
2684
2685 /* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2686 * the lower xprt.
2687 */
2688 rcu_read_lock();
2689 lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2690 rcu_read_unlock();
2691
2692 if (wait_on_bit_lock(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2693 goto out_unlock;
2694
2695 status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
2696 if (status) {
2697 trace_rpc_tls_not_started(upper_clnt, upper_xprt);
2698 goto out_close;
2699 }
2700
2701 status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2702 if (status)
2703 goto out_close;
2704 xprt_release_write(lower_xprt, NULL);
2705
2706 trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
2707 if (!xprt_test_and_set_connected(upper_xprt)) {
2708 upper_xprt->connect_cookie++;
2709 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2710 xprt_clear_connecting(upper_xprt);
2711
2712 upper_xprt->stat.connect_count++;
2713 upper_xprt->stat.connect_time += (long)jiffies -
2714 upper_xprt->stat.connect_start;
2715 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2716 }
2717 rpc_shutdown_client(lower_clnt);
2718
2719 out_unlock:
2720 current_restore_flags(pflags, PF_MEMALLOC);
2721 upper_transport->clnt = NULL;
2722 xprt_unlock_connect(upper_xprt, upper_transport);
2723 return;
2724
2725 out_close:
2726 xprt_release_write(lower_xprt, NULL);
2727 rpc_shutdown_client(lower_clnt);
2728
2729 /* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2730 * Wake them first here to ensure they get our tk_status code.
2731 */
2732 xprt_wake_pending_tasks(upper_xprt, status);
2733 xs_tcp_force_close(upper_xprt);
2734 xprt_clear_connecting(upper_xprt);
2735 goto out_unlock;
2736 }
2737
2738 /**
2739 * xs_connect - connect a socket to a remote endpoint
2740 * @xprt: pointer to transport structure
2741 * @task: address of RPC task that manages state of connect request
2742 *
2743 * TCP: If the remote end dropped the connection, delay reconnecting.
2744 *
2745 * UDP socket connects are synchronous, but we use a work queue anyway
2746 * to guarantee that even unprivileged user processes can set up a
2747 * socket on a privileged port.
2748 *
2749 * If a UDP socket connect fails, the delay behavior here prevents
2750 * retry floods (hard mounts).
2751 */
xs_connect(struct rpc_xprt * xprt,struct rpc_task * task)2752 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2753 {
2754 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2755 unsigned long delay = 0;
2756
2757 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2758
2759 if (transport->sock != NULL) {
2760 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2761 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2762
2763 delay = xprt_reconnect_delay(xprt);
2764 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2765
2766 } else
2767 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2768
2769 transport->clnt = task->tk_client;
2770 queue_delayed_work(xprtiod_workqueue,
2771 &transport->connect_worker,
2772 delay);
2773 }
2774
xs_wake_disconnect(struct sock_xprt * transport)2775 static void xs_wake_disconnect(struct sock_xprt *transport)
2776 {
2777 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2778 xs_tcp_force_close(&transport->xprt);
2779 }
2780
xs_wake_write(struct sock_xprt * transport)2781 static void xs_wake_write(struct sock_xprt *transport)
2782 {
2783 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2784 xprt_write_space(&transport->xprt);
2785 }
2786
xs_wake_error(struct sock_xprt * transport)2787 static void xs_wake_error(struct sock_xprt *transport)
2788 {
2789 int sockerr;
2790
2791 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2792 return;
2793 mutex_lock(&transport->recv_mutex);
2794 if (transport->sock == NULL)
2795 goto out;
2796 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2797 goto out;
2798 sockerr = xchg(&transport->xprt_err, 0);
2799 if (sockerr < 0)
2800 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2801 out:
2802 mutex_unlock(&transport->recv_mutex);
2803 }
2804
xs_wake_pending(struct sock_xprt * transport)2805 static void xs_wake_pending(struct sock_xprt *transport)
2806 {
2807 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2808 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2809 }
2810
xs_error_handle(struct work_struct * work)2811 static void xs_error_handle(struct work_struct *work)
2812 {
2813 struct sock_xprt *transport = container_of(work,
2814 struct sock_xprt, error_worker);
2815
2816 xs_wake_disconnect(transport);
2817 xs_wake_write(transport);
2818 xs_wake_error(transport);
2819 xs_wake_pending(transport);
2820 }
2821
2822 /**
2823 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2824 * @xprt: rpc_xprt struct containing statistics
2825 * @seq: output file
2826 *
2827 */
xs_local_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2828 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2829 {
2830 long idle_time = 0;
2831
2832 if (xprt_connected(xprt))
2833 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2834
2835 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2836 "%llu %llu %lu %llu %llu\n",
2837 xprt->stat.bind_count,
2838 xprt->stat.connect_count,
2839 xprt->stat.connect_time / HZ,
2840 idle_time,
2841 xprt->stat.sends,
2842 xprt->stat.recvs,
2843 xprt->stat.bad_xids,
2844 xprt->stat.req_u,
2845 xprt->stat.bklog_u,
2846 xprt->stat.max_slots,
2847 xprt->stat.sending_u,
2848 xprt->stat.pending_u);
2849 }
2850
2851 /**
2852 * xs_udp_print_stats - display UDP socket-specific stats
2853 * @xprt: rpc_xprt struct containing statistics
2854 * @seq: output file
2855 *
2856 */
xs_udp_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2857 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2858 {
2859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2860
2861 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2862 "%lu %llu %llu\n",
2863 transport->srcport,
2864 xprt->stat.bind_count,
2865 xprt->stat.sends,
2866 xprt->stat.recvs,
2867 xprt->stat.bad_xids,
2868 xprt->stat.req_u,
2869 xprt->stat.bklog_u,
2870 xprt->stat.max_slots,
2871 xprt->stat.sending_u,
2872 xprt->stat.pending_u);
2873 }
2874
2875 /**
2876 * xs_tcp_print_stats - display TCP socket-specific stats
2877 * @xprt: rpc_xprt struct containing statistics
2878 * @seq: output file
2879 *
2880 */
xs_tcp_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)2881 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2882 {
2883 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2884 long idle_time = 0;
2885
2886 if (xprt_connected(xprt))
2887 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2888
2889 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2890 "%llu %llu %lu %llu %llu\n",
2891 transport->srcport,
2892 xprt->stat.bind_count,
2893 xprt->stat.connect_count,
2894 xprt->stat.connect_time / HZ,
2895 idle_time,
2896 xprt->stat.sends,
2897 xprt->stat.recvs,
2898 xprt->stat.bad_xids,
2899 xprt->stat.req_u,
2900 xprt->stat.bklog_u,
2901 xprt->stat.max_slots,
2902 xprt->stat.sending_u,
2903 xprt->stat.pending_u);
2904 }
2905
2906 /*
2907 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2908 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2909 * to use the server side send routines.
2910 */
bc_malloc(struct rpc_task * task)2911 static int bc_malloc(struct rpc_task *task)
2912 {
2913 struct rpc_rqst *rqst = task->tk_rqstp;
2914 size_t size = rqst->rq_callsize;
2915 struct page *page;
2916 struct rpc_buffer *buf;
2917
2918 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2919 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2920 size);
2921 return -EINVAL;
2922 }
2923
2924 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2925 if (!page)
2926 return -ENOMEM;
2927
2928 buf = page_address(page);
2929 buf->len = PAGE_SIZE;
2930
2931 rqst->rq_buffer = buf->data;
2932 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2933 return 0;
2934 }
2935
2936 /*
2937 * Free the space allocated in the bc_alloc routine
2938 */
bc_free(struct rpc_task * task)2939 static void bc_free(struct rpc_task *task)
2940 {
2941 void *buffer = task->tk_rqstp->rq_buffer;
2942 struct rpc_buffer *buf;
2943
2944 buf = container_of(buffer, struct rpc_buffer, data);
2945 free_page((unsigned long)buf);
2946 }
2947
bc_sendto(struct rpc_rqst * req)2948 static int bc_sendto(struct rpc_rqst *req)
2949 {
2950 struct xdr_buf *xdr = &req->rq_snd_buf;
2951 struct sock_xprt *transport =
2952 container_of(req->rq_xprt, struct sock_xprt, xprt);
2953 struct msghdr msg = {
2954 .msg_flags = 0,
2955 };
2956 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2957 (u32)xdr->len);
2958 unsigned int sent = 0;
2959 int err;
2960
2961 req->rq_xtime = ktime_get();
2962 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2963 if (err < 0)
2964 return err;
2965 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2966 xdr_free_bvec(xdr);
2967 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2968 return -EAGAIN;
2969 return sent;
2970 }
2971
2972 /**
2973 * bc_send_request - Send a backchannel Call on a TCP socket
2974 * @req: rpc_rqst containing Call message to be sent
2975 *
2976 * xpt_mutex ensures @rqstp's whole message is written to the socket
2977 * without interruption.
2978 *
2979 * Return values:
2980 * %0 if the message was sent successfully
2981 * %ENOTCONN if the message was not sent
2982 */
bc_send_request(struct rpc_rqst * req)2983 static int bc_send_request(struct rpc_rqst *req)
2984 {
2985 struct svc_xprt *xprt;
2986 int len;
2987
2988 /*
2989 * Get the server socket associated with this callback xprt
2990 */
2991 xprt = req->rq_xprt->bc_xprt;
2992
2993 /*
2994 * Grab the mutex to serialize data as the connection is shared
2995 * with the fore channel
2996 */
2997 mutex_lock(&xprt->xpt_mutex);
2998 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2999 len = -ENOTCONN;
3000 else
3001 len = bc_sendto(req);
3002 mutex_unlock(&xprt->xpt_mutex);
3003
3004 if (len > 0)
3005 len = 0;
3006
3007 return len;
3008 }
3009
3010 /*
3011 * The close routine. Since this is client initiated, we do nothing
3012 */
3013
bc_close(struct rpc_xprt * xprt)3014 static void bc_close(struct rpc_xprt *xprt)
3015 {
3016 xprt_disconnect_done(xprt);
3017 }
3018
3019 /*
3020 * The xprt destroy routine. Again, because this connection is client
3021 * initiated, we do nothing
3022 */
3023
bc_destroy(struct rpc_xprt * xprt)3024 static void bc_destroy(struct rpc_xprt *xprt)
3025 {
3026 dprintk("RPC: bc_destroy xprt %p\n", xprt);
3027
3028 xs_xprt_free(xprt);
3029 module_put(THIS_MODULE);
3030 }
3031
3032 static const struct rpc_xprt_ops xs_local_ops = {
3033 .reserve_xprt = xprt_reserve_xprt,
3034 .release_xprt = xprt_release_xprt,
3035 .alloc_slot = xprt_alloc_slot,
3036 .free_slot = xprt_free_slot,
3037 .rpcbind = xs_local_rpcbind,
3038 .set_port = xs_local_set_port,
3039 .connect = xs_local_connect,
3040 .buf_alloc = rpc_malloc,
3041 .buf_free = rpc_free,
3042 .prepare_request = xs_stream_prepare_request,
3043 .send_request = xs_local_send_request,
3044 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3045 .close = xs_close,
3046 .destroy = xs_destroy,
3047 .print_stats = xs_local_print_stats,
3048 .enable_swap = xs_enable_swap,
3049 .disable_swap = xs_disable_swap,
3050 };
3051
3052 static const struct rpc_xprt_ops xs_udp_ops = {
3053 .set_buffer_size = xs_udp_set_buffer_size,
3054 .reserve_xprt = xprt_reserve_xprt_cong,
3055 .release_xprt = xprt_release_xprt_cong,
3056 .alloc_slot = xprt_alloc_slot,
3057 .free_slot = xprt_free_slot,
3058 .rpcbind = rpcb_getport_async,
3059 .set_port = xs_set_port,
3060 .connect = xs_connect,
3061 .get_srcaddr = xs_sock_srcaddr,
3062 .get_srcport = xs_sock_srcport,
3063 .buf_alloc = rpc_malloc,
3064 .buf_free = rpc_free,
3065 .send_request = xs_udp_send_request,
3066 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3067 .timer = xs_udp_timer,
3068 .release_request = xprt_release_rqst_cong,
3069 .close = xs_close,
3070 .destroy = xs_destroy,
3071 .print_stats = xs_udp_print_stats,
3072 .enable_swap = xs_enable_swap,
3073 .disable_swap = xs_disable_swap,
3074 .inject_disconnect = xs_inject_disconnect,
3075 };
3076
3077 static const struct rpc_xprt_ops xs_tcp_ops = {
3078 .reserve_xprt = xprt_reserve_xprt,
3079 .release_xprt = xprt_release_xprt,
3080 .alloc_slot = xprt_alloc_slot,
3081 .free_slot = xprt_free_slot,
3082 .rpcbind = rpcb_getport_async,
3083 .set_port = xs_set_port,
3084 .connect = xs_connect,
3085 .get_srcaddr = xs_sock_srcaddr,
3086 .get_srcport = xs_sock_srcport,
3087 .buf_alloc = rpc_malloc,
3088 .buf_free = rpc_free,
3089 .prepare_request = xs_stream_prepare_request,
3090 .send_request = xs_tcp_send_request,
3091 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3092 .close = xs_tcp_shutdown,
3093 .destroy = xs_destroy,
3094 .set_connect_timeout = xs_tcp_set_connect_timeout,
3095 .print_stats = xs_tcp_print_stats,
3096 .enable_swap = xs_enable_swap,
3097 .disable_swap = xs_disable_swap,
3098 .inject_disconnect = xs_inject_disconnect,
3099 #ifdef CONFIG_SUNRPC_BACKCHANNEL
3100 .bc_setup = xprt_setup_bc,
3101 .bc_maxpayload = xs_tcp_bc_maxpayload,
3102 .bc_num_slots = xprt_bc_max_slots,
3103 .bc_free_rqst = xprt_free_bc_rqst,
3104 .bc_destroy = xprt_destroy_bc,
3105 #endif
3106 };
3107
3108 /*
3109 * The rpc_xprt_ops for the server backchannel
3110 */
3111
3112 static const struct rpc_xprt_ops bc_tcp_ops = {
3113 .reserve_xprt = xprt_reserve_xprt,
3114 .release_xprt = xprt_release_xprt,
3115 .alloc_slot = xprt_alloc_slot,
3116 .free_slot = xprt_free_slot,
3117 .buf_alloc = bc_malloc,
3118 .buf_free = bc_free,
3119 .send_request = bc_send_request,
3120 .wait_for_reply_request = xprt_wait_for_reply_request_def,
3121 .close = bc_close,
3122 .destroy = bc_destroy,
3123 .print_stats = xs_tcp_print_stats,
3124 .enable_swap = xs_enable_swap,
3125 .disable_swap = xs_disable_swap,
3126 .inject_disconnect = xs_inject_disconnect,
3127 };
3128
xs_init_anyaddr(const int family,struct sockaddr * sap)3129 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3130 {
3131 static const struct sockaddr_in sin = {
3132 .sin_family = AF_INET,
3133 .sin_addr.s_addr = htonl(INADDR_ANY),
3134 };
3135 static const struct sockaddr_in6 sin6 = {
3136 .sin6_family = AF_INET6,
3137 .sin6_addr = IN6ADDR_ANY_INIT,
3138 };
3139
3140 switch (family) {
3141 case AF_LOCAL:
3142 break;
3143 case AF_INET:
3144 memcpy(sap, &sin, sizeof(sin));
3145 break;
3146 case AF_INET6:
3147 memcpy(sap, &sin6, sizeof(sin6));
3148 break;
3149 default:
3150 dprintk("RPC: %s: Bad address family\n", __func__);
3151 return -EAFNOSUPPORT;
3152 }
3153 return 0;
3154 }
3155
xs_setup_xprt(struct xprt_create * args,unsigned int slot_table_size,unsigned int max_slot_table_size)3156 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3157 unsigned int slot_table_size,
3158 unsigned int max_slot_table_size)
3159 {
3160 struct rpc_xprt *xprt;
3161 struct sock_xprt *new;
3162
3163 if (args->addrlen > sizeof(xprt->addr)) {
3164 dprintk("RPC: xs_setup_xprt: address too large\n");
3165 return ERR_PTR(-EBADF);
3166 }
3167
3168 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3169 max_slot_table_size);
3170 if (xprt == NULL) {
3171 dprintk("RPC: xs_setup_xprt: couldn't allocate "
3172 "rpc_xprt\n");
3173 return ERR_PTR(-ENOMEM);
3174 }
3175
3176 new = container_of(xprt, struct sock_xprt, xprt);
3177 mutex_init(&new->recv_mutex);
3178 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3179 xprt->addrlen = args->addrlen;
3180 if (args->srcaddr)
3181 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3182 else {
3183 int err;
3184 err = xs_init_anyaddr(args->dstaddr->sa_family,
3185 (struct sockaddr *)&new->srcaddr);
3186 if (err != 0) {
3187 xprt_free(xprt);
3188 return ERR_PTR(err);
3189 }
3190 }
3191
3192 return xprt;
3193 }
3194
3195 static const struct rpc_timeout xs_local_default_timeout = {
3196 .to_initval = 10 * HZ,
3197 .to_maxval = 10 * HZ,
3198 .to_retries = 2,
3199 };
3200
3201 /**
3202 * xs_setup_local - Set up transport to use an AF_LOCAL socket
3203 * @args: rpc transport creation arguments
3204 *
3205 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3206 */
xs_setup_local(struct xprt_create * args)3207 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3208 {
3209 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3210 struct sock_xprt *transport;
3211 struct rpc_xprt *xprt;
3212 struct rpc_xprt *ret;
3213
3214 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3215 xprt_max_tcp_slot_table_entries);
3216 if (IS_ERR(xprt))
3217 return xprt;
3218 transport = container_of(xprt, struct sock_xprt, xprt);
3219
3220 xprt->prot = 0;
3221 xprt->xprt_class = &xs_local_transport;
3222 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3223
3224 xprt->bind_timeout = XS_BIND_TO;
3225 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3226 xprt->idle_timeout = XS_IDLE_DISC_TO;
3227
3228 xprt->ops = &xs_local_ops;
3229 xprt->timeout = &xs_local_default_timeout;
3230
3231 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3232 INIT_WORK(&transport->error_worker, xs_error_handle);
3233 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3234
3235 switch (sun->sun_family) {
3236 case AF_LOCAL:
3237 if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3238 dprintk("RPC: bad AF_LOCAL address: %s\n",
3239 sun->sun_path);
3240 ret = ERR_PTR(-EINVAL);
3241 goto out_err;
3242 }
3243 xprt_set_bound(xprt);
3244 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3245 break;
3246 default:
3247 ret = ERR_PTR(-EAFNOSUPPORT);
3248 goto out_err;
3249 }
3250
3251 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
3252 xprt->address_strings[RPC_DISPLAY_ADDR]);
3253
3254 if (try_module_get(THIS_MODULE))
3255 return xprt;
3256 ret = ERR_PTR(-EINVAL);
3257 out_err:
3258 xs_xprt_free(xprt);
3259 return ret;
3260 }
3261
3262 static const struct rpc_timeout xs_udp_default_timeout = {
3263 .to_initval = 5 * HZ,
3264 .to_maxval = 30 * HZ,
3265 .to_increment = 5 * HZ,
3266 .to_retries = 5,
3267 };
3268
3269 /**
3270 * xs_setup_udp - Set up transport to use a UDP socket
3271 * @args: rpc transport creation arguments
3272 *
3273 */
xs_setup_udp(struct xprt_create * args)3274 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3275 {
3276 struct sockaddr *addr = args->dstaddr;
3277 struct rpc_xprt *xprt;
3278 struct sock_xprt *transport;
3279 struct rpc_xprt *ret;
3280
3281 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3282 xprt_udp_slot_table_entries);
3283 if (IS_ERR(xprt))
3284 return xprt;
3285 transport = container_of(xprt, struct sock_xprt, xprt);
3286
3287 xprt->prot = IPPROTO_UDP;
3288 xprt->xprt_class = &xs_udp_transport;
3289 /* XXX: header size can vary due to auth type, IPv6, etc. */
3290 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3291
3292 xprt->bind_timeout = XS_BIND_TO;
3293 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3294 xprt->idle_timeout = XS_IDLE_DISC_TO;
3295
3296 xprt->ops = &xs_udp_ops;
3297
3298 xprt->timeout = &xs_udp_default_timeout;
3299
3300 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3301 INIT_WORK(&transport->error_worker, xs_error_handle);
3302 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3303
3304 switch (addr->sa_family) {
3305 case AF_INET:
3306 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3307 xprt_set_bound(xprt);
3308
3309 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3310 break;
3311 case AF_INET6:
3312 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3313 xprt_set_bound(xprt);
3314
3315 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3316 break;
3317 default:
3318 ret = ERR_PTR(-EAFNOSUPPORT);
3319 goto out_err;
3320 }
3321
3322 if (xprt_bound(xprt))
3323 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3324 xprt->address_strings[RPC_DISPLAY_ADDR],
3325 xprt->address_strings[RPC_DISPLAY_PORT],
3326 xprt->address_strings[RPC_DISPLAY_PROTO]);
3327 else
3328 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3329 xprt->address_strings[RPC_DISPLAY_ADDR],
3330 xprt->address_strings[RPC_DISPLAY_PROTO]);
3331
3332 if (try_module_get(THIS_MODULE))
3333 return xprt;
3334 ret = ERR_PTR(-EINVAL);
3335 out_err:
3336 xs_xprt_free(xprt);
3337 return ret;
3338 }
3339
3340 static const struct rpc_timeout xs_tcp_default_timeout = {
3341 .to_initval = 60 * HZ,
3342 .to_maxval = 60 * HZ,
3343 .to_retries = 2,
3344 };
3345
3346 /**
3347 * xs_setup_tcp - Set up transport to use a TCP socket
3348 * @args: rpc transport creation arguments
3349 *
3350 */
xs_setup_tcp(struct xprt_create * args)3351 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3352 {
3353 struct sockaddr *addr = args->dstaddr;
3354 struct rpc_xprt *xprt;
3355 struct sock_xprt *transport;
3356 struct rpc_xprt *ret;
3357 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3358
3359 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3360 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3361
3362 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3363 max_slot_table_size);
3364 if (IS_ERR(xprt))
3365 return xprt;
3366 transport = container_of(xprt, struct sock_xprt, xprt);
3367
3368 xprt->prot = IPPROTO_TCP;
3369 xprt->xprt_class = &xs_tcp_transport;
3370 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3371
3372 xprt->bind_timeout = XS_BIND_TO;
3373 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3374 xprt->idle_timeout = XS_IDLE_DISC_TO;
3375
3376 xprt->ops = &xs_tcp_ops;
3377 xprt->timeout = &xs_tcp_default_timeout;
3378
3379 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3380 if (args->reconnect_timeout)
3381 xprt->max_reconnect_timeout = args->reconnect_timeout;
3382
3383 xprt->connect_timeout = xprt->timeout->to_initval *
3384 (xprt->timeout->to_retries + 1);
3385 if (args->connect_timeout)
3386 xs_tcp_do_set_connect_timeout(xprt, args->connect_timeout);
3387
3388 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3389 INIT_WORK(&transport->error_worker, xs_error_handle);
3390 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3391
3392 switch (addr->sa_family) {
3393 case AF_INET:
3394 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3395 xprt_set_bound(xprt);
3396
3397 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3398 break;
3399 case AF_INET6:
3400 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3401 xprt_set_bound(xprt);
3402
3403 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3404 break;
3405 default:
3406 ret = ERR_PTR(-EAFNOSUPPORT);
3407 goto out_err;
3408 }
3409
3410 if (xprt_bound(xprt))
3411 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3412 xprt->address_strings[RPC_DISPLAY_ADDR],
3413 xprt->address_strings[RPC_DISPLAY_PORT],
3414 xprt->address_strings[RPC_DISPLAY_PROTO]);
3415 else
3416 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3417 xprt->address_strings[RPC_DISPLAY_ADDR],
3418 xprt->address_strings[RPC_DISPLAY_PROTO]);
3419
3420 if (try_module_get(THIS_MODULE))
3421 return xprt;
3422 ret = ERR_PTR(-EINVAL);
3423 out_err:
3424 xs_xprt_free(xprt);
3425 return ret;
3426 }
3427
3428 /**
3429 * xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3430 * @args: rpc transport creation arguments
3431 *
3432 */
xs_setup_tcp_tls(struct xprt_create * args)3433 static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3434 {
3435 struct sockaddr *addr = args->dstaddr;
3436 struct rpc_xprt *xprt;
3437 struct sock_xprt *transport;
3438 struct rpc_xprt *ret;
3439 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3440
3441 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3442 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3443
3444 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3445 max_slot_table_size);
3446 if (IS_ERR(xprt))
3447 return xprt;
3448 transport = container_of(xprt, struct sock_xprt, xprt);
3449
3450 xprt->prot = IPPROTO_TCP;
3451 xprt->xprt_class = &xs_tcp_transport;
3452 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3453
3454 xprt->bind_timeout = XS_BIND_TO;
3455 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3456 xprt->idle_timeout = XS_IDLE_DISC_TO;
3457
3458 xprt->ops = &xs_tcp_ops;
3459 xprt->timeout = &xs_tcp_default_timeout;
3460
3461 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3462 xprt->connect_timeout = xprt->timeout->to_initval *
3463 (xprt->timeout->to_retries + 1);
3464
3465 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3466 INIT_WORK(&transport->error_worker, xs_error_handle);
3467
3468 switch (args->xprtsec.policy) {
3469 case RPC_XPRTSEC_TLS_ANON:
3470 case RPC_XPRTSEC_TLS_X509:
3471 xprt->xprtsec = args->xprtsec;
3472 INIT_DELAYED_WORK(&transport->connect_worker,
3473 xs_tcp_tls_setup_socket);
3474 break;
3475 default:
3476 ret = ERR_PTR(-EACCES);
3477 goto out_err;
3478 }
3479
3480 switch (addr->sa_family) {
3481 case AF_INET:
3482 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3483 xprt_set_bound(xprt);
3484
3485 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3486 break;
3487 case AF_INET6:
3488 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3489 xprt_set_bound(xprt);
3490
3491 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3492 break;
3493 default:
3494 ret = ERR_PTR(-EAFNOSUPPORT);
3495 goto out_err;
3496 }
3497
3498 if (xprt_bound(xprt))
3499 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3500 xprt->address_strings[RPC_DISPLAY_ADDR],
3501 xprt->address_strings[RPC_DISPLAY_PORT],
3502 xprt->address_strings[RPC_DISPLAY_PROTO]);
3503 else
3504 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3505 xprt->address_strings[RPC_DISPLAY_ADDR],
3506 xprt->address_strings[RPC_DISPLAY_PROTO]);
3507
3508 if (try_module_get(THIS_MODULE))
3509 return xprt;
3510 ret = ERR_PTR(-EINVAL);
3511 out_err:
3512 xs_xprt_free(xprt);
3513 return ret;
3514 }
3515
3516 /**
3517 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3518 * @args: rpc transport creation arguments
3519 *
3520 */
xs_setup_bc_tcp(struct xprt_create * args)3521 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3522 {
3523 struct sockaddr *addr = args->dstaddr;
3524 struct rpc_xprt *xprt;
3525 struct sock_xprt *transport;
3526 struct svc_sock *bc_sock;
3527 struct rpc_xprt *ret;
3528
3529 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3530 xprt_tcp_slot_table_entries);
3531 if (IS_ERR(xprt))
3532 return xprt;
3533 transport = container_of(xprt, struct sock_xprt, xprt);
3534
3535 xprt->prot = IPPROTO_TCP;
3536 xprt->xprt_class = &xs_bc_tcp_transport;
3537 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3538 xprt->timeout = &xs_tcp_default_timeout;
3539
3540 /* backchannel */
3541 xprt_set_bound(xprt);
3542 xprt->bind_timeout = 0;
3543 xprt->reestablish_timeout = 0;
3544 xprt->idle_timeout = 0;
3545
3546 xprt->ops = &bc_tcp_ops;
3547
3548 switch (addr->sa_family) {
3549 case AF_INET:
3550 xs_format_peer_addresses(xprt, "tcp",
3551 RPCBIND_NETID_TCP);
3552 break;
3553 case AF_INET6:
3554 xs_format_peer_addresses(xprt, "tcp",
3555 RPCBIND_NETID_TCP6);
3556 break;
3557 default:
3558 ret = ERR_PTR(-EAFNOSUPPORT);
3559 goto out_err;
3560 }
3561
3562 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3563 xprt->address_strings[RPC_DISPLAY_ADDR],
3564 xprt->address_strings[RPC_DISPLAY_PORT],
3565 xprt->address_strings[RPC_DISPLAY_PROTO]);
3566
3567 /*
3568 * Once we've associated a backchannel xprt with a connection,
3569 * we want to keep it around as long as the connection lasts,
3570 * in case we need to start using it for a backchannel again;
3571 * this reference won't be dropped until bc_xprt is destroyed.
3572 */
3573 xprt_get(xprt);
3574 args->bc_xprt->xpt_bc_xprt = xprt;
3575 xprt->bc_xprt = args->bc_xprt;
3576 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3577 transport->sock = bc_sock->sk_sock;
3578 transport->inet = bc_sock->sk_sk;
3579
3580 /*
3581 * Since we don't want connections for the backchannel, we set
3582 * the xprt status to connected
3583 */
3584 xprt_set_connected(xprt);
3585
3586 if (try_module_get(THIS_MODULE))
3587 return xprt;
3588
3589 args->bc_xprt->xpt_bc_xprt = NULL;
3590 args->bc_xprt->xpt_bc_xps = NULL;
3591 xprt_put(xprt);
3592 ret = ERR_PTR(-EINVAL);
3593 out_err:
3594 xs_xprt_free(xprt);
3595 return ret;
3596 }
3597
3598 static struct xprt_class xs_local_transport = {
3599 .list = LIST_HEAD_INIT(xs_local_transport.list),
3600 .name = "named UNIX socket",
3601 .owner = THIS_MODULE,
3602 .ident = XPRT_TRANSPORT_LOCAL,
3603 .setup = xs_setup_local,
3604 .netid = { "" },
3605 };
3606
3607 static struct xprt_class xs_udp_transport = {
3608 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3609 .name = "udp",
3610 .owner = THIS_MODULE,
3611 .ident = XPRT_TRANSPORT_UDP,
3612 .setup = xs_setup_udp,
3613 .netid = { "udp", "udp6", "" },
3614 };
3615
3616 static struct xprt_class xs_tcp_transport = {
3617 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3618 .name = "tcp",
3619 .owner = THIS_MODULE,
3620 .ident = XPRT_TRANSPORT_TCP,
3621 .setup = xs_setup_tcp,
3622 .netid = { "tcp", "tcp6", "" },
3623 };
3624
3625 static struct xprt_class xs_tcp_tls_transport = {
3626 .list = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3627 .name = "tcp-with-tls",
3628 .owner = THIS_MODULE,
3629 .ident = XPRT_TRANSPORT_TCP_TLS,
3630 .setup = xs_setup_tcp_tls,
3631 .netid = { "tcp", "tcp6", "" },
3632 };
3633
3634 static struct xprt_class xs_bc_tcp_transport = {
3635 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3636 .name = "tcp NFSv4.1 backchannel",
3637 .owner = THIS_MODULE,
3638 .ident = XPRT_TRANSPORT_BC_TCP,
3639 .setup = xs_setup_bc_tcp,
3640 .netid = { "" },
3641 };
3642
3643 /**
3644 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3645 *
3646 */
init_socket_xprt(void)3647 int init_socket_xprt(void)
3648 {
3649 if (!sunrpc_table_header)
3650 sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3651
3652 xprt_register_transport(&xs_local_transport);
3653 xprt_register_transport(&xs_udp_transport);
3654 xprt_register_transport(&xs_tcp_transport);
3655 xprt_register_transport(&xs_tcp_tls_transport);
3656 xprt_register_transport(&xs_bc_tcp_transport);
3657
3658 return 0;
3659 }
3660
3661 /**
3662 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3663 *
3664 */
cleanup_socket_xprt(void)3665 void cleanup_socket_xprt(void)
3666 {
3667 if (sunrpc_table_header) {
3668 unregister_sysctl_table(sunrpc_table_header);
3669 sunrpc_table_header = NULL;
3670 }
3671
3672 xprt_unregister_transport(&xs_local_transport);
3673 xprt_unregister_transport(&xs_udp_transport);
3674 xprt_unregister_transport(&xs_tcp_transport);
3675 xprt_unregister_transport(&xs_tcp_tls_transport);
3676 xprt_unregister_transport(&xs_bc_tcp_transport);
3677 }
3678
param_set_portnr(const char * val,const struct kernel_param * kp)3679 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3680 {
3681 return param_set_uint_minmax(val, kp,
3682 RPC_MIN_RESVPORT,
3683 RPC_MAX_RESVPORT);
3684 }
3685
3686 static const struct kernel_param_ops param_ops_portnr = {
3687 .set = param_set_portnr,
3688 .get = param_get_uint,
3689 };
3690
3691 #define param_check_portnr(name, p) \
3692 __param_check(name, p, unsigned int);
3693
3694 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3695 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3696
param_set_slot_table_size(const char * val,const struct kernel_param * kp)3697 static int param_set_slot_table_size(const char *val,
3698 const struct kernel_param *kp)
3699 {
3700 return param_set_uint_minmax(val, kp,
3701 RPC_MIN_SLOT_TABLE,
3702 RPC_MAX_SLOT_TABLE);
3703 }
3704
3705 static const struct kernel_param_ops param_ops_slot_table_size = {
3706 .set = param_set_slot_table_size,
3707 .get = param_get_uint,
3708 };
3709
3710 #define param_check_slot_table_size(name, p) \
3711 __param_check(name, p, unsigned int);
3712
param_set_max_slot_table_size(const char * val,const struct kernel_param * kp)3713 static int param_set_max_slot_table_size(const char *val,
3714 const struct kernel_param *kp)
3715 {
3716 return param_set_uint_minmax(val, kp,
3717 RPC_MIN_SLOT_TABLE,
3718 RPC_MAX_SLOT_TABLE_LIMIT);
3719 }
3720
3721 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3722 .set = param_set_max_slot_table_size,
3723 .get = param_get_uint,
3724 };
3725
3726 #define param_check_max_slot_table_size(name, p) \
3727 __param_check(name, p, unsigned int);
3728
3729 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3730 slot_table_size, 0644);
3731 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3732 max_slot_table_size, 0644);
3733 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3734 slot_table_size, 0644);
3735