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