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net: bridge: mcast: fix broken length + header check for MRDv6 Adv.
[linux-block.git] / net / sunrpc / xprtsock.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
a246b010
CL		 2/*
3 * linux/net/sunrpc/xprtsock.c
4 *
5 * Client-side transport implementation for sockets.
6 *
113aa838
AC		 7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 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>
55aa4f58
CL		 15 *
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 17 *
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
a246b010
CL		 20 */
21
22#include <linux/types.h>
176e21ee 23#include <linux/string.h>
a246b010 24#include <linux/slab.h>
bc25571e 25#include <linux/module.h>
a246b010 26#include <linux/capability.h>
a246b010
CL		 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>
176e21ee 33#include <linux/un.h>
a246b010
CL		 34#include <linux/udp.h>
35#include <linux/tcp.h>
36#include <linux/sunrpc/clnt.h>
5976687a 37#include <linux/sunrpc/addr.h>
02107148 38#include <linux/sunrpc/sched.h>
4cfc7e60 39#include <linux/sunrpc/svcsock.h>
49c36fcc 40#include <linux/sunrpc/xprtsock.h>
a246b010 41#include <linux/file.h>
9e00abc3 42#ifdef CONFIG_SUNRPC_BACKCHANNEL
44b98efd
RL		 43#include <linux/sunrpc/bc_xprt.h>
44#endif
a246b010
CL		 45
46#include <net/sock.h>
47#include <net/checksum.h>
48#include <net/udp.h>
49#include <net/tcp.h>
277e4ab7 50#include <linux/bvec.h>
6a829eb8 51#include <linux/highmem.h>
277e4ab7 52#include <linux/uio.h>
a1231fda 53#include <linux/sched/mm.h>
a246b010 54
40b5ea0c
TM		 55#include <trace/events/sunrpc.h>
56
9e55eef4 57#include "socklib.h"
4cfc7e60 58#include "sunrpc.h"
176e21ee
CL		 59
60static void xs_close(struct rpc_xprt *xprt);
7196dbb0
TM		 61static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
62 struct socket *sock);
176e21ee 63
c556b754
CL		 64/*
65 * xprtsock tunables
66 */
09acfea5
TM		 67static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
68static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
69static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 70
09acfea5
TM		 71static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
72static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 73
7d1e8255 74#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 75static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 76
fbf76683
CL		 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
fbf76683
CL		 86static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
87static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 88static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 89static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
90static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
91
92static 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 */
fe2c6338 98static struct ctl_table xs_tunables_table[] = {
fbf76683 99 {
fbf76683
CL		 100 .procname = "udp_slot_table_entries",
101 .data = &xprt_udp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
6d456111 104 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
108 {
fbf76683
CL		 109 .procname = "tcp_slot_table_entries",
110 .data = &xprt_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
6d456111 113 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_slot_table_size
116 },
d9ba131d
TM		 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 },
fbf76683 126 {
fbf76683
CL		 127 .procname = "min_resvport",
128 .data = &xprt_min_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
6d456111 131 .proc_handler = proc_dointvec_minmax,
fbf76683 132 .extra1 = &xprt_min_resvport_limit,
826799e6 133 .extra2 = &xprt_max_resvport_limit
fbf76683
CL		 134 },
135 {
fbf76683
CL		 136 .procname = "max_resvport",
137 .data = &xprt_max_resvport,
138 .maxlen = sizeof(unsigned int),
139 .mode = 0644,
6d456111 140 .proc_handler = proc_dointvec_minmax,
826799e6 141 .extra1 = &xprt_min_resvport_limit,
fbf76683
CL		 142 .extra2 = &xprt_max_resvport_limit
143 },
25fe6142
TM		 144 {
145 .procname = "tcp_fin_timeout",
146 .data = &xs_tcp_fin_timeout,
147 .maxlen = sizeof(xs_tcp_fin_timeout),
148 .mode = 0644,
6d456111 149 .proc_handler = proc_dointvec_jiffies,
fbf76683 150 },
f8572d8f 151 { },
fbf76683
CL		 152};
153
fe2c6338 154static struct ctl_table sunrpc_table[] = {
fbf76683 155 {
fbf76683
CL		 156 .procname = "sunrpc",
157 .mode = 0555,
158 .child = xs_tunables_table
159 },
f8572d8f 160 { },
fbf76683
CL		 161};
162
03bf4b70
CL		 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)
03bf4b70
CL		 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
f895b252 192#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
a246b010 193# undef RPC_DEBUG_DATA
9903cd1c 194# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 195#endif
196
a246b010 197#ifdef RPC_DEBUG_DATA
9903cd1c 198static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 199{
9903cd1c
CL		 200 u8 *buf = (u8 *) packet;
201 int j;
a246b010 202
46121cf7 203 dprintk("RPC: %s\n", msg);
a246b010
CL		 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
9903cd1c 216static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 217{
218 /* NOP */
219}
220#endif
221
2118071d
TM		 222static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
223{
224 return (struct rpc_xprt *) sk->sk_user_data;
225}
226
95392c59
CL		 227static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
228{
229 return (struct sockaddr *) &xprt->addr;
230}
231
176e21ee
CL		 232static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
233{
234 return (struct sockaddr_un *) &xprt->addr;
235}
236
95392c59 237static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 238{
95392c59
CL		 239 return (struct sockaddr_in *) &xprt->addr;
240}
241
242static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
243{
244 return (struct sockaddr_in6 *) &xprt->addr;
245}
246
c877b849 247static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 248{
c877b849 249 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 250 struct sockaddr_in6 *sin6;
251 struct sockaddr_in *sin;
176e21ee 252 struct sockaddr_un *sun;
c877b849 253 char buf[128];
edb267a6 254
9dc3b095 255 switch (sap->sa_family) {
176e21ee
CL		 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;
9dc3b095 262 case AF_INET:
176e21ee
CL		 263 (void)rpc_ntop(sap, buf, sizeof(buf));
264 xprt->address_strings[RPC_DISPLAY_ADDR] =
265 kstrdup(buf, GFP_KERNEL);
9dc3b095 266 sin = xs_addr_in(xprt);
fc0b5791 267 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 268 break;
269 case AF_INET6:
176e21ee
CL		 270 (void)rpc_ntop(sap, buf, sizeof(buf));
271 xprt->address_strings[RPC_DISPLAY_ADDR] =
272 kstrdup(buf, GFP_KERNEL);
9dc3b095 273 sin6 = xs_addr_in6(xprt);
fc0b5791 274 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 275 break;
276 default:
277 BUG();
756805e7 278 }
176e21ee 279
9dc3b095 280 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 281}
282
9dc3b095 283static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 284{
9dc3b095
CL		 285 struct sockaddr *sap = xs_addr(xprt);
286 char buf[128];
4b6473fb 287
81160e66 288 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 289 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 290
81160e66 291 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 292 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
293}
4b6473fb 294
9dc3b095
CL		 295static void xs_format_peer_addresses(struct rpc_xprt *xprt,
296 const char *protocol,
297 const char *netid)
c877b849 298{
b454ae90 299 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 300 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 301 xs_format_common_peer_addresses(xprt);
9dc3b095 302 xs_format_common_peer_ports(xprt);
edb267a6 303}
4b6473fb 304
9dc3b095 305static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 306{
9dc3b095
CL		 307 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
308 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 309
9dc3b095 310 xs_format_common_peer_ports(xprt);
edb267a6
CL		 311}
312
313static void xs_free_peer_addresses(struct rpc_xprt *xprt)
314{
33e01dc7
CL		 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 }
edb267a6
CL		 325}
326
277e4ab7
TM		 327static size_t
328xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
329{
330 size_t i,n;
331
16e5e90f 332 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
277e4ab7 333 return want;
277e4ab7
TM		 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]) {
16e5e90f
TM		 340 i *= PAGE_SIZE;
341 return i > buf->page_base ? i - buf->page_base : 0;
277e4ab7
TM		 342 }
343 }
344 return want;
345}
346
347static ssize_t
348xs_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
357static ssize_t
358xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
359 struct kvec *kvec, size_t count, size_t seek)
360{
0e9b4a82 361 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
277e4ab7
TM		 362 return xs_sock_recvmsg(sock, msg, flags, seek);
363}
364
365static ssize_t
366xs_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{
0e9b4a82 370 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
277e4ab7
TM		 371 return xs_sock_recvmsg(sock, msg, flags, seek);
372}
373
374static ssize_t
375xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
376 size_t count)
377{
b76a5afd
TM		 378 iov_iter_discard(&msg->msg_iter, READ, count);
379 return sock_recvmsg(sock, msg, flags);
277e4ab7
TM		 380}
381
6a829eb8
TM		 382#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
383static void
384xs_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
396static inline void
397xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
398{
399}
400#endif
401
277e4ab7
TM		 402static ssize_t
403xs_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
e92053a5
TM		 409 want = min_t(size_t, count, buf->head[0].iov_len);
410 if (seek < want) {
277e4ab7
TM		 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)
c4433055 418 goto out;
277e4ab7
TM		 419 seek = 0;
420 } else {
e92053a5
TM		 421 seek -= want;
422 offset += want;
277e4ab7 423 }
16e5e90f
TM		 424
425 want = xs_alloc_sparse_pages(buf,
426 min_t(size_t, count - offset, buf->page_len),
12a3ad61 427 GFP_KERNEL);
16e5e90f 428 if (seek < want) {
277e4ab7
TM		 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;
6a829eb8 435 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
ac9645c8
DA		 436 ret -= buf->page_base;
437 offset += ret;
277e4ab7
TM		 438 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
439 goto out;
440 if (ret != want)
c4433055 441 goto out;
277e4ab7
TM		 442 seek = 0;
443 } else {
16e5e90f
TM		 444 seek -= want;
445 offset += want;
277e4ab7 446 }
16e5e90f 447
e92053a5
TM		 448 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
449 if (seek < want) {
277e4ab7
TM		 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)
c4433055 457 goto out;
9734ad57 458 } else if (offset < seek_init)
e92053a5 459 offset = seek_init;
277e4ab7 460 ret = -EMSGSIZE;
277e4ab7
TM		 461out:
462 *read = offset - seek_init;
463 return ret;
277e4ab7
TM		 464sock_err:
465 offset += seek;
466 goto out;
467}
468
469static void
470xs_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
481static bool
482xs_read_stream_request_done(struct sock_xprt *transport)
483{
484 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
485}
486
e92053a5
TM		 487static void
488xs_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
277e4ab7
TM		 495static ssize_t
496xs_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;
3f649ab7
KC		 500 size_t want, read;
501 ssize_t ret;
277e4ab7
TM		 502
503 xs_read_header(transport, buf);
504
505 want = transport->recv.len - transport->recv.offset;
e92053a5
TM		 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;
727fcc64 513 }
e92053a5 514
727fcc64 515 if (transport->recv.offset == transport->recv.len)
e92053a5 516 xs_read_stream_check_eor(transport, msg);
277e4ab7 517
e92053a5
TM		 518 if (want == 0)
519 return 0;
520
277e4ab7 521 switch (ret) {
c4433055
TM		 522 default:
523 break;
26781eab 524 case -EFAULT:
277e4ab7 525 case -EMSGSIZE:
26781eab 526 msg->msg_flags |= MSG_TRUNC;
c4433055 527 return read;
277e4ab7
TM		 528 case 0:
529 return -ESHUTDOWN;
277e4ab7 530 }
c4433055 531 return ret < 0 ? ret : read;
277e4ab7
TM		 532}
533
534static size_t
535xs_read_stream_headersize(bool isfrag)
536{
537 if (isfrag)
538 return sizeof(__be32);
539 return 3 * sizeof(__be32);
540}
541
542static ssize_t
543xs_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)
554static ssize_t
555xs_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 /* Look up and lock the request corresponding to the given XID */
562 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
563 if (!req) {
564 printk(KERN_WARNING "Callback slot table overflowed\n");
565 return -ESHUTDOWN;
566 }
45835a63
TM		 567 if (transport->recv.copied && !req->rq_private_buf.len)
568 return -ESHUTDOWN;
277e4ab7
TM		 569
570 ret = xs_read_stream_request(transport, msg, flags, req);
571 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
c4433055 572 xprt_complete_bc_request(req, transport->recv.copied);
45835a63
TM		 573 else
574 req->rq_private_buf.len = transport->recv.copied;
277e4ab7
TM		 575
576 return ret;
577}
578#else /* CONFIG_SUNRPC_BACKCHANNEL */
579static ssize_t
580xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
581{
582 return -ESHUTDOWN;
583}
584#endif /* CONFIG_SUNRPC_BACKCHANNEL */
585
586static ssize_t
587xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
588{
589 struct rpc_xprt *xprt = &transport->xprt;
590 struct rpc_rqst *req;
591 ssize_t ret = 0;
592
593 /* Look up and lock the request corresponding to the given XID */
594 spin_lock(&xprt->queue_lock);
595 req = xprt_lookup_rqst(xprt, transport->recv.xid);
45835a63 596 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
277e4ab7
TM		 597 msg->msg_flags |= MSG_TRUNC;
598 goto out;
599 }
600 xprt_pin_rqst(req);
601 spin_unlock(&xprt->queue_lock);
602
603 ret = xs_read_stream_request(transport, msg, flags, req);
604
605 spin_lock(&xprt->queue_lock);
606 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
c4433055 607 xprt_complete_rqst(req->rq_task, transport->recv.copied);
45835a63
TM		 608 else
609 req->rq_private_buf.len = transport->recv.copied;
277e4ab7
TM		 610 xprt_unpin_rqst(req);
611out:
612 spin_unlock(&xprt->queue_lock);
613 return ret;
614}
615
616static ssize_t
617xs_read_stream(struct sock_xprt *transport, int flags)
618{
619 struct msghdr msg = { 0 };
620 size_t want, read = 0;
621 ssize_t ret = 0;
622
623 if (transport->recv.len == 0) {
624 want = xs_read_stream_headersize(transport->recv.copied != 0);
625 ret = xs_read_stream_header(transport, &msg, flags, want,
626 transport->recv.offset);
627 if (ret <= 0)
628 goto out_err;
629 transport->recv.offset = ret;
c4433055
TM		 630 if (transport->recv.offset != want)
631 return transport->recv.offset;
277e4ab7
TM		 632 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
633 RPC_FRAGMENT_SIZE_MASK;
634 transport->recv.offset -= sizeof(transport->recv.fraghdr);
635 read = ret;
636 }
637
638 switch (be32_to_cpu(transport->recv.calldir)) {
c4433055
TM		 639 default:
640 msg.msg_flags |= MSG_TRUNC;
641 break;
277e4ab7
TM		 642 case RPC_CALL:
643 ret = xs_read_stream_call(transport, &msg, flags);
644 break;
645 case RPC_REPLY:
646 ret = xs_read_stream_reply(transport, &msg, flags);
647 }
648 if (msg.msg_flags & MSG_TRUNC) {
649 transport->recv.calldir = cpu_to_be32(-1);
650 transport->recv.copied = -1;
651 }
652 if (ret < 0)
653 goto out_err;
654 read += ret;
655 if (transport->recv.offset < transport->recv.len) {
c4433055
TM		 656 if (!(msg.msg_flags & MSG_TRUNC))
657 return read;
b76a5afd 658 msg.msg_flags = 0;
277e4ab7
TM		 659 ret = xs_read_discard(transport->sock, &msg, flags,
660 transport->recv.len - transport->recv.offset);
661 if (ret <= 0)
662 goto out_err;
663 transport->recv.offset += ret;
664 read += ret;
665 if (transport->recv.offset != transport->recv.len)
c4433055 666 return read;
277e4ab7
TM		 667 }
668 if (xs_read_stream_request_done(transport)) {
c50b8ee0 669 trace_xs_stream_read_request(transport);
277e4ab7
TM		 670 transport->recv.copied = 0;
671 }
672 transport->recv.offset = 0;
673 transport->recv.len = 0;
674 return read;
675out_err:
79462857 676 return ret != 0 ? ret : -ESHUTDOWN;
277e4ab7
TM		 677}
678
0ffe86f4
TM		 679static __poll_t xs_poll_socket(struct sock_xprt *transport)
680{
a73881c9
TM		 681 return transport->sock->ops->poll(transport->file, transport->sock,
682 NULL);
0ffe86f4
TM		 683}
684
685static bool xs_poll_socket_readable(struct sock_xprt *transport)
686{
687 __poll_t events = xs_poll_socket(transport);
688
689 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
690}
691
692static void xs_poll_check_readable(struct sock_xprt *transport)
693{
694
695 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
696 if (!xs_poll_socket_readable(transport))
697 return;
698 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
699 queue_work(xprtiod_workqueue, &transport->recv_worker);
700}
701
c50b8ee0
TM		 702static void xs_stream_data_receive(struct sock_xprt *transport)
703{
704 size_t read = 0;
705 ssize_t ret = 0;
706
707 mutex_lock(&transport->recv_mutex);
708 if (transport->sock == NULL)
709 goto out;
c50b8ee0
TM		 710 for (;;) {
711 ret = xs_read_stream(transport, MSG_DONTWAIT);
c4433055 712 if (ret < 0)
c50b8ee0
TM		 713 break;
714 read += ret;
715 cond_resched();
716 }
5f52a9d4
TM		 717 if (ret == -ESHUTDOWN)
718 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
719 else
720 xs_poll_check_readable(transport);
c50b8ee0
TM		 721out:
722 mutex_unlock(&transport->recv_mutex);
723 trace_xs_stream_read_data(&transport->xprt, ret, read);
724}
725
726static void xs_stream_data_receive_workfn(struct work_struct *work)
727{
728 struct sock_xprt *transport =
729 container_of(work, struct sock_xprt, recv_worker);
a1231fda
TM		 730 unsigned int pflags = memalloc_nofs_save();
731
c50b8ee0 732 xs_stream_data_receive(transport);
a1231fda 733 memalloc_nofs_restore(pflags);
c50b8ee0
TM		 734}
735
550aebfe
TM		 736static void
737xs_stream_reset_connect(struct sock_xprt *transport)
738{
739 transport->recv.offset = 0;
740 transport->recv.len = 0;
741 transport->recv.copied = 0;
742 transport->xmit.offset = 0;
ae053551
TM		 743}
744
745static void
746xs_stream_start_connect(struct sock_xprt *transport)
747{
550aebfe
TM		 748 transport->xprt.stat.connect_count++;
749 transport->xprt.stat.connect_start = jiffies;
750}
751
b4b5cc85
CL		 752#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
753
9903cd1c 754/**
c544577d 755 * xs_nospace - handle transmit was incomplete
50f484e2 756 * @req: pointer to RPC request
9903cd1c 757 *
a246b010 758 */
c544577d 759static int xs_nospace(struct rpc_rqst *req)
a246b010 760{
262965f5 761 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 762 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
06ea0bfe 763 struct sock *sk = transport->inet;
24ca9a84 764 int ret = -EAGAIN;
a246b010 765
015747d2 766 trace_rpc_socket_nospace(req, transport);
262965f5 767
b6ddf64f 768 /* Protect against races with write_space */
b5e92419 769 spin_lock(&xprt->transport_lock);
b6ddf64f
TM		 770
771 /* Don't race with disconnect */
772 if (xprt_connected(xprt)) {
13331a55
TM		 773 /* wait for more buffer space */
774 sk->sk_write_pending++;
c544577d 775 xprt_wait_for_buffer_space(xprt);
13331a55 776 } else
5e3771ce 777 ret = -ENOTCONN;
262965f5 778
b5e92419 779 spin_unlock(&xprt->transport_lock);
06ea0bfe
TM		 780
781 /* Race breaker in case memory is freed before above code is called */
d48f9ce7
DV		 782 if (ret == -EAGAIN) {
783 struct socket_wq *wq;
784
785 rcu_read_lock();
786 wq = rcu_dereference(sk->sk_wq);
787 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
788 rcu_read_unlock();
789
790 sk->sk_write_space(sk);
791 }
5e3771ce 792 return ret;
262965f5
CL		 793}
794
277e4ab7
TM		 795static void
796xs_stream_prepare_request(struct rpc_rqst *req)
797{
75369089 798 xdr_free_bvec(&req->rq_rcv_buf);
12a3ad61 799 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
277e4ab7
TM		 800}
801
4cd34e7c
TM		 802/*
803 * Determine if the previous message in the stream was aborted before it
804 * could complete transmission.
805 */
806static bool
807xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
808{
809 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
810}
811
61677eee 812/*
06b5fc3a 813 * Return the stream record marker field for a record of length < 2^31-1
61677eee 814 */
06b5fc3a
TM		 815static rpc_fraghdr
816xs_stream_record_marker(struct xdr_buf *xdr)
61677eee 817{
06b5fc3a
TM		 818 if (!xdr->len)
819 return 0;
820 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
61677eee
CL		 821}
822
176e21ee
CL		 823/**
824 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
50f484e2 825 * @req: pointer to RPC request
176e21ee
CL		 826 *
827 * Return values:
828 * 0: The request has been sent
829 * EAGAIN: The socket was blocked, please call again later to
830 * complete the request
831 * ENOTCONN: Caller needs to invoke connect logic then call again
12b20ce3 832 * other: Some other error occurred, the request was not sent
176e21ee 833 */
adfa7144 834static int xs_local_send_request(struct rpc_rqst *req)
176e21ee 835{
176e21ee
CL		 836 struct rpc_xprt *xprt = req->rq_xprt;
837 struct sock_xprt *transport =
838 container_of(xprt, struct sock_xprt, xprt);
839 struct xdr_buf *xdr = &req->rq_snd_buf;
7e3d3620
TM		 840 rpc_fraghdr rm = xs_stream_record_marker(xdr);
841 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
9e55eef4
CL		 842 struct msghdr msg = {
843 .msg_flags = XS_SENDMSG_FLAGS,
844 };
3f649ab7 845 unsigned int sent;
176e21ee
CL		 846 int status;
847
4cd34e7c
TM		 848 /* Close the stream if the previous transmission was incomplete */
849 if (xs_send_request_was_aborted(transport, req)) {
850 xs_close(xprt);
851 return -ENOTCONN;
852 }
853
176e21ee
CL		 854 xs_pktdump("packet data:",
855 req->rq_svec->iov_base, req->rq_svec->iov_len);
856
78215759 857 req->rq_xtime = ktime_get();
9e55eef4
CL		 858 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
859 transport->xmit.offset, rm, &sent);
176e21ee 860 dprintk("RPC: %s(%u) = %d\n",
6c7a64e5 861 __func__, xdr->len - transport->xmit.offset, status);
743c69e7
N		 862
863 if (status == -EAGAIN && sock_writeable(transport->inet))
864 status = -ENOBUFS;
865
f279cd00 866 if (likely(sent > 0) || status == 0) {
6c7a64e5
TM		 867 transport->xmit.offset += sent;
868 req->rq_bytes_sent = transport->xmit.offset;
7e3d3620 869 if (likely(req->rq_bytes_sent >= msglen)) {
6c7a64e5 870 req->rq_xmit_bytes_sent += transport->xmit.offset;
6c7a64e5 871 transport->xmit.offset = 0;
176e21ee
CL		 872 return 0;
873 }
874 status = -EAGAIN;
875 }
876
877 switch (status) {
3601c4a9 878 case -ENOBUFS:
b5872f0c 879 break;
176e21ee 880 case -EAGAIN:
c544577d 881 status = xs_nospace(req);
176e21ee
CL		 882 break;
883 default:
884 dprintk("RPC: sendmsg returned unrecognized error %d\n",
885 -status);
df561f66 886 fallthrough;
176e21ee
CL		 887 case -EPIPE:
888 xs_close(xprt);
889 status = -ENOTCONN;
890 }
891
892 return status;
893}
894
262965f5
CL		 895/**
896 * xs_udp_send_request - write an RPC request to a UDP socket
50f484e2 897 * @req: pointer to RPC request
262965f5
CL		 898 *
899 * Return values:
900 * 0: The request has been sent
901 * EAGAIN: The socket was blocked, please call again later to
902 * complete the request
903 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 904 * other: Some other error occurred, the request was not sent
262965f5 905 */
adfa7144 906static int xs_udp_send_request(struct rpc_rqst *req)
262965f5 907{
262965f5 908 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 909 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 910 struct xdr_buf *xdr = &req->rq_snd_buf;
9e55eef4
CL		 911 struct msghdr msg = {
912 .msg_name = xs_addr(xprt),
913 .msg_namelen = xprt->addrlen,
914 .msg_flags = XS_SENDMSG_FLAGS,
915 };
3f649ab7 916 unsigned int sent;
262965f5 917 int status;
a246b010 918
9903cd1c 919 xs_pktdump("packet data:",
a246b010
CL		 920 req->rq_svec->iov_base,
921 req->rq_svec->iov_len);
922
01d37c42
TM		 923 if (!xprt_bound(xprt))
924 return -ENOTCONN;
75891f50
TM		 925
926 if (!xprt_request_get_cong(xprt, req))
927 return -EBADSLT;
928
78215759 929 req->rq_xtime = ktime_get();
9e55eef4 930 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
a246b010 931
46121cf7 932 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
6c7a64e5 933 xdr->len, status);
a246b010 934
3dedbb5c
JB		 935 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
936 if (status == -EPERM)
937 goto process_status;
938
743c69e7
N		 939 if (status == -EAGAIN && sock_writeable(transport->inet))
940 status = -ENOBUFS;
941
f279cd00
JB		 942 if (sent > 0 || status == 0) {
943 req->rq_xmit_bytes_sent += sent;
944 if (sent >= req->rq_slen)
2199700f
TM		 945 return 0;
946 /* Still some bytes left; set up for a retry later. */
262965f5 947 status = -EAGAIN;
2199700f 948 }
a246b010 949
3dedbb5c 950process_status:
262965f5 951 switch (status) {
fba91afb
TM		 952 case -ENOTSOCK:
953 status = -ENOTCONN;
954 /* Should we call xs_close() here? */
955 break;
b6ddf64f 956 case -EAGAIN:
c544577d 957 status = xs_nospace(req);
b6ddf64f 958 break;
262965f5 959 case -ENETUNREACH:
3601c4a9 960 case -ENOBUFS:
262965f5 961 case -EPIPE:
a246b010 962 case -ECONNREFUSED:
3dedbb5c 963 case -EPERM:
a246b010 964 /* When the server has died, an ICMP port unreachable message
9903cd1c 965 * prompts ECONNREFUSED. */
13331a55
TM		 966 break;
967 default:
968 dprintk("RPC: sendmsg returned unrecognized error %d\n",
969 -status);
a246b010 970 }
5fe46e9d 971
262965f5 972 return status;
a246b010
CL		 973}
974
9903cd1c 975/**
262965f5 976 * xs_tcp_send_request - write an RPC request to a TCP socket
50f484e2 977 * @req: pointer to RPC request
9903cd1c
CL		 978 *
979 * Return values:
262965f5
CL		 980 * 0: The request has been sent
981 * EAGAIN: The socket was blocked, please call again later to
982 * complete the request
983 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 984 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 985 *
986 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 987 * if sendmsg is not able to make progress?
9903cd1c 988 */
adfa7144 989static int xs_tcp_send_request(struct rpc_rqst *req)
a246b010 990{
a246b010 991 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 992 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 993 struct xdr_buf *xdr = &req->rq_snd_buf;
7e3d3620
TM		 994 rpc_fraghdr rm = xs_stream_record_marker(xdr);
995 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
9e55eef4
CL		 996 struct msghdr msg = {
997 .msg_flags = XS_SENDMSG_FLAGS,
998 };
9ffadfbc 999 bool vm_wait = false;
3f649ab7 1000 unsigned int sent;
b595bb15 1001 int status;
a246b010 1002
4cd34e7c
TM		 1003 /* Close the stream if the previous transmission was incomplete */
1004 if (xs_send_request_was_aborted(transport, req)) {
1005 if (transport->sock != NULL)
1006 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1007 return -ENOTCONN;
1008 }
1009
262965f5
CL		 1010 xs_pktdump("packet data:",
1011 req->rq_svec->iov_base,
1012 req->rq_svec->iov_len);
a246b010 1013
7196dbb0
TM		 1014 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1015 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1016
a246b010
CL		 1017 /* Continue transmitting the packet/record. We must be careful
1018 * to cope with writespace callbacks arriving _after_ we have
262965f5 1019 * called sendmsg(). */
78215759 1020 req->rq_xtime = ktime_get();
a246b010 1021 while (1) {
9e55eef4
CL		 1022 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1023 transport->xmit.offset, rm, &sent);
a246b010 1024
46121cf7 1025 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
6c7a64e5 1026 xdr->len - transport->xmit.offset, status);
a246b010 1027
262965f5
CL		 1028 /* If we've sent the entire packet, immediately
1029 * reset the count of bytes sent. */
6c7a64e5
TM		 1030 transport->xmit.offset += sent;
1031 req->rq_bytes_sent = transport->xmit.offset;
7e3d3620 1032 if (likely(req->rq_bytes_sent >= msglen)) {
6c7a64e5 1033 req->rq_xmit_bytes_sent += transport->xmit.offset;
6c7a64e5 1034 transport->xmit.offset = 0;
262965f5
CL		 1035 return 0;
1036 }
a246b010 1037
9ffadfbc
TM		 1038 WARN_ON_ONCE(sent == 0 && status == 0);
1039
1040 if (status == -EAGAIN ) {
1041 /*
1042 * Return EAGAIN if we're sure we're hitting the
1043 * socket send buffer limits.
1044 */
1045 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1046 break;
1047 /*
1048 * Did we hit a memory allocation failure?
1049 */
1050 if (sent == 0) {
1051 status = -ENOBUFS;
1052 if (vm_wait)
1053 break;
1054 /* Retry, knowing now that we're below the
1055 * socket send buffer limit
1056 */
1057 vm_wait = true;
1058 }
1059 continue;
1060 }
f580dd04
TM		 1061 if (status < 0)
1062 break;
9ffadfbc 1063 vm_wait = false;
a246b010
CL		 1064 }
1065
262965f5 1066 switch (status) {
fba91afb
TM		 1067 case -ENOTSOCK:
1068 status = -ENOTCONN;
1069 /* Should we call xs_close() here? */
1070 break;
262965f5 1071 case -EAGAIN:
c544577d 1072 status = xs_nospace(req);
262965f5 1073 break;
262965f5 1074 case -ECONNRESET:
2a9e1cfa 1075 case -ECONNREFUSED:
262965f5 1076 case -ENOTCONN:
3913c78c 1077 case -EADDRINUSE:
b5872f0c 1078 case -ENOBUFS:
b9d2bb2e 1079 case -EPIPE:
13331a55
TM		 1080 break;
1081 default:
1082 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1083 -status);
a246b010 1084 }
5fe46e9d 1085
a246b010
CL		 1086 return status;
1087}
1088
2a9e1cfa
TM		 1089static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1090{
1091 transport->old_data_ready = sk->sk_data_ready;
1092 transport->old_state_change = sk->sk_state_change;
1093 transport->old_write_space = sk->sk_write_space;
2118071d 1094 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 1095}
1096
1097static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1098{
1099 sk->sk_data_ready = transport->old_data_ready;
1100 sk->sk_state_change = transport->old_state_change;
1101 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 1102 sk->sk_error_report = transport->old_error_report;
1103}
1104
42d42a5b
TM		 1105static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1106{
1107 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1108
1109 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
4f8943f8
TM		 1110 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1111 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1112 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1113}
1114
1115static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1116{
1117 set_bit(nr, &transport->sock_state);
1118 queue_work(xprtiod_workqueue, &transport->error_worker);
42d42a5b
TM		 1119}
1120
b70ae915
TM		 1121static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1122{
1123 smp_mb__before_atomic();
1124 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1125 clear_bit(XPRT_CLOSING, &xprt->state);
42d42a5b 1126 xs_sock_reset_state_flags(xprt);
b70ae915
TM		 1127 smp_mb__after_atomic();
1128}
1129
2118071d
TM		 1130/**
1131 * xs_error_report - callback to handle TCP socket state errors
1132 * @sk: socket
1133 *
1134 * Note: we don't call sock_error() since there may be a rpc_task
1135 * using the socket, and so we don't want to clear sk->sk_err.
1136 */
1137static void xs_error_report(struct sock *sk)
1138{
4f8943f8 1139 struct sock_xprt *transport;
2118071d 1140 struct rpc_xprt *xprt;
2118071d
TM		 1141
1142 read_lock_bh(&sk->sk_callback_lock);
1143 if (!(xprt = xprt_from_sock(sk)))
1144 goto out;
1145
4f8943f8 1146 transport = container_of(xprt, struct sock_xprt, xprt);
af84537d
BC		 1147 transport->xprt_err = -sk->sk_err;
1148 if (transport->xprt_err == 0)
2118071d
TM		 1149 goto out;
1150 dprintk("RPC: xs_error_report client %p, error=%d...\n",
af84537d
BC		 1151 xprt, -transport->xprt_err);
1152 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1153
1154 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1155 smp_mb__before_atomic();
4f8943f8 1156 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
2118071d
TM		 1157 out:
1158 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1159}
1160
fe315e76 1161static void xs_reset_transport(struct sock_xprt *transport)
a246b010 1162{
ee0ac0c2
CL		 1163 struct socket *sock = transport->sock;
1164 struct sock *sk = transport->inet;
6cc7e908 1165 struct rpc_xprt *xprt = &transport->xprt;
a73881c9 1166 struct file *filp = transport->file;
a246b010 1167
fe315e76
CL		 1168 if (sk == NULL)
1169 return;
9903cd1c 1170
264d1df3
JL		 1171 if (atomic_read(&transport->xprt.swapper))
1172 sk_clear_memalloc(sk);
1173
09939204
TM		 1174 kernel_sock_shutdown(sock, SHUT_RDWR);
1175
edc1b01c 1176 mutex_lock(&transport->recv_mutex);
a246b010 1177 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 1178 transport->inet = NULL;
1179 transport->sock = NULL;
a73881c9 1180 transport->file = NULL;
a246b010 1181
9903cd1c 1182 sk->sk_user_data = NULL;
2a9e1cfa
TM		 1183
1184 xs_restore_old_callbacks(transport, sk);
0c78789e 1185 xprt_clear_connected(xprt);
a246b010 1186 write_unlock_bh(&sk->sk_callback_lock);
6cc7e908 1187 xs_sock_reset_connection_flags(xprt);
ae053551
TM		 1188 /* Reset stream record info */
1189 xs_stream_reset_connect(transport);
edc1b01c 1190 mutex_unlock(&transport->recv_mutex);
a246b010 1191
6cc7e908 1192 trace_rpc_socket_close(xprt, sock);
a73881c9 1193 fput(filp);
0445f92c
TM		 1194
1195 xprt_disconnect_done(xprt);
fe315e76
CL		 1196}
1197
1198/**
1199 * xs_close - close a socket
1200 * @xprt: transport
1201 *
1202 * This is used when all requests are complete; ie, no DRC state remains
1203 * on the server we want to save.
f75e6745
TM		 1204 *
1205 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1206 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 1207 */
1208static void xs_close(struct rpc_xprt *xprt)
1209{
1210 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1211
1212 dprintk("RPC: xs_close xprt %p\n", xprt);
1213
1214 xs_reset_transport(transport);
61d0a8e6 1215 xprt->reestablish_timeout = 0;
a246b010
CL		 1216}
1217
4a068258
CL		 1218static void xs_inject_disconnect(struct rpc_xprt *xprt)
1219{
1220 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1221 xprt);
1222 xprt_disconnect_done(xprt);
1223}
1224
315f3812
KM		 1225static void xs_xprt_free(struct rpc_xprt *xprt)
1226{
1227 xs_free_peer_addresses(xprt);
1228 xprt_free(xprt);
1229}
1230
9903cd1c
CL		 1231/**
1232 * xs_destroy - prepare to shutdown a transport
1233 * @xprt: doomed transport
1234 *
1235 */
1236static void xs_destroy(struct rpc_xprt *xprt)
a246b010 1237{
03c78827
TM		 1238 struct sock_xprt *transport = container_of(xprt,
1239 struct sock_xprt, xprt);
46121cf7 1240 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 1241
03c78827 1242 cancel_delayed_work_sync(&transport->connect_worker);
a1311d87 1243 xs_close(xprt);
edc1b01c 1244 cancel_work_sync(&transport->recv_worker);
b5e92419 1245 cancel_work_sync(&transport->error_worker);
315f3812 1246 xs_xprt_free(xprt);
a1311d87 1247 module_put(THIS_MODULE);
a246b010
CL		 1248}
1249
9903cd1c 1250/**
f9b2ee71
TM		 1251 * xs_udp_data_read_skb - receive callback for UDP sockets
1252 * @xprt: transport
1253 * @sk: socket
1254 * @skb: skbuff
9903cd1c 1255 *
a246b010 1256 */
f9b2ee71
TM		 1257static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1258 struct sock *sk,
1259 struct sk_buff *skb)
a246b010 1260{
9903cd1c 1261 struct rpc_task *task;
a246b010 1262 struct rpc_rqst *rovr;
f9b2ee71 1263 int repsize, copied;
d8ed029d
AD		 1264 u32 _xid;
1265 __be32 *xp;
a246b010 1266
1da8c681 1267 repsize = skb->len;
a246b010 1268 if (repsize < 4) {
46121cf7 1269 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
f9b2ee71 1270 return;
a246b010
CL		 1271 }
1272
1273 /* Copy the XID from the skb... */
1da8c681 1274 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
a246b010 1275 if (xp == NULL)
f9b2ee71 1276 return;
a246b010
CL		 1277
1278 /* Look up and lock the request corresponding to the given XID */
75c84151 1279 spin_lock(&xprt->queue_lock);
a246b010
CL		 1280 rovr = xprt_lookup_rqst(xprt, *xp);
1281 if (!rovr)
1282 goto out_unlock;
729749bb 1283 xprt_pin_rqst(rovr);
ecd465ee 1284 xprt_update_rtt(rovr->rq_task);
75c84151 1285 spin_unlock(&xprt->queue_lock);
a246b010
CL		 1286 task = rovr->rq_task;
1287
a246b010
CL		 1288 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1289 copied = repsize;
1290
1291 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5 1292 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
75c84151 1293 spin_lock(&xprt->queue_lock);
0afa6b44 1294 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
729749bb 1295 goto out_unpin;
1781f7f5
HX		 1296 }
1297
a246b010 1298
b5e92419 1299 spin_lock(&xprt->transport_lock);
6a24dfb6 1300 xprt_adjust_cwnd(xprt, task, copied);
b5e92419 1301 spin_unlock(&xprt->transport_lock);
75c84151 1302 spin_lock(&xprt->queue_lock);
1570c1e4 1303 xprt_complete_rqst(task, copied);
0afa6b44 1304 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
729749bb
TM		 1305out_unpin:
1306 xprt_unpin_rqst(rovr);
a246b010 1307 out_unlock:
75c84151 1308 spin_unlock(&xprt->queue_lock);
f9b2ee71
TM		 1309}
1310
1311static void xs_udp_data_receive(struct sock_xprt *transport)
1312{
1313 struct sk_buff *skb;
1314 struct sock *sk;
1315 int err;
1316
1317 mutex_lock(&transport->recv_mutex);
1318 sk = transport->inet;
1319 if (sk == NULL)
1320 goto out;
1321 for (;;) {
7c13f97f 1322 skb = skb_recv_udp(sk, 0, 1, &err);
4f546149 1323 if (skb == NULL)
f9b2ee71 1324 break;
4f546149
TM		 1325 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1326 consume_skb(skb);
1327 cond_resched();
f9b2ee71 1328 }
0ffe86f4 1329 xs_poll_check_readable(transport);
f9b2ee71
TM		 1330out:
1331 mutex_unlock(&transport->recv_mutex);
1332}
1333
1334static void xs_udp_data_receive_workfn(struct work_struct *work)
1335{
1336 struct sock_xprt *transport =
1337 container_of(work, struct sock_xprt, recv_worker);
a1231fda
TM		 1338 unsigned int pflags = memalloc_nofs_save();
1339
f9b2ee71 1340 xs_udp_data_receive(transport);
a1231fda 1341 memalloc_nofs_restore(pflags);
f9b2ee71
TM		 1342}
1343
1344/**
1345 * xs_data_ready - "data ready" callback for UDP sockets
1346 * @sk: socket with data to read
1347 *
1348 */
1349static void xs_data_ready(struct sock *sk)
1350{
1351 struct rpc_xprt *xprt;
1352
1353 read_lock_bh(&sk->sk_callback_lock);
1354 dprintk("RPC: xs_data_ready...\n");
1355 xprt = xprt_from_sock(sk);
1356 if (xprt != NULL) {
1357 struct sock_xprt *transport = container_of(xprt,
1358 struct sock_xprt, xprt);
5157b956
TM		 1359 transport->old_data_ready(sk);
1360 /* Any data means we had a useful conversation, so
1361 * then we don't need to delay the next reconnect
1362 */
1363 if (xprt->reestablish_timeout)
1364 xprt->reestablish_timeout = 0;
42d42a5b 1365 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
40a5f1b1 1366 queue_work(xprtiod_workqueue, &transport->recv_worker);
f9b2ee71 1367 }
f064af1e 1368 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1369}
1370
a519fc7a
TM		 1371/*
1372 * Helper function to force a TCP close if the server is sending
1373 * junk and/or it has put us in CLOSE_WAIT
1374 */
1375static void xs_tcp_force_close(struct rpc_xprt *xprt)
1376{
a519fc7a
TM		 1377 xprt_force_disconnect(xprt);
1378}
1379
9e00abc3 1380#if defined(CONFIG_SUNRPC_BACKCHANNEL)
6b26cc8c
CL		 1381static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1382{
1383 return PAGE_SIZE;
1384}
9e00abc3 1385#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd 1386
9903cd1c
CL		 1387/**
1388 * xs_tcp_state_change - callback to handle TCP socket state changes
1389 * @sk: socket whose state has changed
1390 *
1391 */
1392static void xs_tcp_state_change(struct sock *sk)
a246b010 1393{
9903cd1c 1394 struct rpc_xprt *xprt;
0fdea1e8 1395 struct sock_xprt *transport;
a246b010 1396
f064af1e 1397 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1398 if (!(xprt = xprt_from_sock(sk)))
1399 goto out;
46121cf7 1400 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1401 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1402 sk->sk_state, xprt_connected(xprt),
1403 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1404 sock_flag(sk, SOCK_ZAPPED),
1405 sk->sk_shutdown);
a246b010 1406
0fdea1e8 1407 transport = container_of(xprt, struct sock_xprt, xprt);
40b5ea0c 1408 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1409 switch (sk->sk_state) {
1410 case TCP_ESTABLISHED:
a246b010 1411 if (!xprt_test_and_set_connected(xprt)) {
8b71798c 1412 xprt->connect_cookie++;
0fdea1e8
TM		 1413 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1414 xprt_clear_connecting(xprt);
51971139 1415
3968a8a5
CL		 1416 xprt->stat.connect_count++;
1417 xprt->stat.connect_time += (long)jiffies -
1418 xprt->stat.connect_start;
4f8943f8 1419 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
a246b010 1420 }
a246b010 1421 break;
3b948ae5
TM		 1422 case TCP_FIN_WAIT1:
1423 /* The client initiated a shutdown of the socket */
7c1d71cf 1424 xprt->connect_cookie++;
663b8858 1425 xprt->reestablish_timeout = 0;
3b948ae5 1426 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1427 smp_mb__before_atomic();
3b948ae5 1428 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1429 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
4e857c58 1430 smp_mb__after_atomic();
a246b010 1431 break;
632e3bdc 1432 case TCP_CLOSE_WAIT:
3b948ae5 1433 /* The server initiated a shutdown of the socket */
7c1d71cf 1434 xprt->connect_cookie++;
d0bea455 1435 clear_bit(XPRT_CONNECTED, &xprt->state);
4f8943f8 1436 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
df561f66 1437 fallthrough;
663b8858
TM		 1438 case TCP_CLOSING:
1439 /*
1440 * If the server closed down the connection, make sure that
1441 * we back off before reconnecting
1442 */
1443 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1444 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1445 break;
1446 case TCP_LAST_ACK:
670f9457 1447 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1448 smp_mb__before_atomic();
3b948ae5 1449 clear_bit(XPRT_CONNECTED, &xprt->state);
4e857c58 1450 smp_mb__after_atomic();
3b948ae5
TM		 1451 break;
1452 case TCP_CLOSE:
0fdea1e8
TM		 1453 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1454 &transport->sock_state))
1455 xprt_clear_connecting(xprt);
9b30889c 1456 clear_bit(XPRT_CLOSING, &xprt->state);
9b30889c 1457 /* Trigger the socket release */
4f8943f8 1458 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
a246b010
CL		 1459 }
1460 out:
f064af1e 1461 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1462}
1463
1f0fa154
IJ		 1464static void xs_write_space(struct sock *sk)
1465{
13331a55 1466 struct socket_wq *wq;
4f8943f8 1467 struct sock_xprt *transport;
1f0fa154
IJ		 1468 struct rpc_xprt *xprt;
1469
13331a55 1470 if (!sk->sk_socket)
1f0fa154 1471 return;
13331a55 1472 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1f0fa154
IJ		 1473
1474 if (unlikely(!(xprt = xprt_from_sock(sk))))
1475 return;
4f8943f8 1476 transport = container_of(xprt, struct sock_xprt, xprt);
13331a55
TM		 1477 rcu_read_lock();
1478 wq = rcu_dereference(sk->sk_wq);
1479 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1480 goto out;
1f0fa154 1481
4f8943f8
TM		 1482 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1483 sk->sk_write_pending--;
13331a55
TM		 1484out:
1485 rcu_read_unlock();
1f0fa154
IJ		 1486}
1487
9903cd1c 1488/**
c7b2cae8
CL		 1489 * xs_udp_write_space - callback invoked when socket buffer space
1490 * becomes available
9903cd1c
CL		 1491 * @sk: socket whose state has changed
1492 *
a246b010
CL		 1493 * Called when more output buffer space is available for this socket.
1494 * We try not to wake our writers until they can make "significant"
c7b2cae8 1495 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1496 * with a bunch of small requests.
1497 */
c7b2cae8 1498static void xs_udp_write_space(struct sock *sk)
a246b010 1499{
f064af1e 1500 read_lock_bh(&sk->sk_callback_lock);
a246b010 1501
c7b2cae8 1502 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1503 if (sock_writeable(sk))
1504 xs_write_space(sk);
a246b010 1505
f064af1e 1506 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1507}
a246b010 1508
c7b2cae8
CL		 1509/**
1510 * xs_tcp_write_space - callback invoked when socket buffer space
1511 * becomes available
1512 * @sk: socket whose state has changed
1513 *
1514 * Called when more output buffer space is available for this socket.
1515 * We try not to wake our writers until they can make "significant"
1516 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1517 * with a bunch of small requests.
1518 */
1519static void xs_tcp_write_space(struct sock *sk)
1520{
f064af1e 1521 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1522
1523 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1524 if (sk_stream_is_writeable(sk))
1f0fa154 1525 xs_write_space(sk);
b6ddf64f 1526
f064af1e 1527 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1528}
1529
470056c2 1530static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1531{
ee0ac0c2
CL		 1532 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1533 struct sock *sk = transport->inet;
a246b010 1534
7c6e066e 1535 if (transport->rcvsize) {
a246b010 1536 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1537 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1538 }
7c6e066e 1539 if (transport->sndsize) {
a246b010 1540 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1541 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1542 sk->sk_write_space(sk);
1543 }
1544}
1545
43118c29 1546/**
470056c2 1547 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1548 * @xprt: generic transport
470056c2
CL		 1549 * @sndsize: requested size of send buffer, in bytes
1550 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1551 *
470056c2 1552 * Set socket send and receive buffer size limits.
43118c29 1553 */
470056c2 1554static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1555{
7c6e066e
CL		 1556 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1557
1558 transport->sndsize = 0;
470056c2 1559 if (sndsize)
7c6e066e
CL		 1560 transport->sndsize = sndsize + 1024;
1561 transport->rcvsize = 0;
470056c2 1562 if (rcvsize)
7c6e066e 1563 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1564
1565 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1566}
1567
46c0ee8b
CL		 1568/**
1569 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
acf0a39f 1570 * @xprt: controlling transport
46c0ee8b
CL		 1571 * @task: task that timed out
1572 *
1573 * Adjust the congestion window after a retransmit timeout has occurred.
1574 */
6a24dfb6 1575static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1576{
b5e92419 1577 spin_lock(&xprt->transport_lock);
6a24dfb6 1578 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
b5e92419 1579 spin_unlock(&xprt->transport_lock);
46c0ee8b
CL		 1580}
1581
826799e6 1582static int xs_get_random_port(void)
b85d8806 1583{
826799e6
BF		 1584 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1585 unsigned short range;
1586 unsigned short rand;
1587
1588 if (max < min)
1589 return -EADDRINUSE;
1590 range = max - min + 1;
1591 rand = (unsigned short) prandom_u32() % range;
1592 return rand + min;
b85d8806
CL		 1593}
1594
4dda9c8a
TM		 1595static unsigned short xs_sock_getport(struct socket *sock)
1596{
1597 struct sockaddr_storage buf;
4dda9c8a
TM		 1598 unsigned short port = 0;
1599
9b2c45d4 1600 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
4dda9c8a
TM		 1601 goto out;
1602 switch (buf.ss_family) {
1603 case AF_INET6:
1604 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1605 break;
1606 case AF_INET:
1607 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1608 }
1609out:
1610 return port;
1611}
1612
92200412
CL		 1613/**
1614 * xs_set_port - reset the port number in the remote endpoint address
1615 * @xprt: generic transport
1616 * @port: new port number
1617 *
1618 */
1619static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1620{
46121cf7 1621 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1622
9dc3b095
CL		 1623 rpc_set_port(xs_addr(xprt), port);
1624 xs_update_peer_port(xprt);
92200412
CL		 1625}
1626
4dda9c8a
TM		 1627static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1628{
e6237b6f 1629 if (transport->srcport == 0 && transport->xprt.reuseport)
4dda9c8a
TM		 1630 transport->srcport = xs_sock_getport(sock);
1631}
1632
826799e6 1633static int xs_get_srcport(struct sock_xprt *transport)
67a391d7 1634{
826799e6 1635 int port = transport->srcport;
67a391d7
TM		 1636
1637 if (port == 0 && transport->xprt.resvport)
1638 port = xs_get_random_port();
1639 return port;
1640}
1641
baaf4e48 1642static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1643{
fbfffbd5
CL		 1644 if (transport->srcport != 0)
1645 transport->srcport = 0;
67a391d7
TM		 1646 if (!transport->xprt.resvport)
1647 return 0;
1648 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1649 return xprt_max_resvport;
1650 return --port;
1651}
beb59b68 1652static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1653{
beb59b68 1654 struct sockaddr_storage myaddr;
67a391d7 1655 int err, nloop = 0;
826799e6 1656 int port = xs_get_srcport(transport);
67a391d7 1657 unsigned short last;
a246b010 1658
0f7a622c
CP		 1659 /*
1660 * If we are asking for any ephemeral port (i.e. port == 0 &&
1661 * transport->xprt.resvport == 0), don't bind. Let the local
1662 * port selection happen implicitly when the socket is used
1663 * (for example at connect time).
1664 *
1665 * This ensures that we can continue to establish TCP
1666 * connections even when all local ephemeral ports are already
1667 * a part of some TCP connection. This makes no difference
12b20ce3 1668 * for UDP sockets, but also doesn't harm them.
0f7a622c
CP		 1669 *
1670 * If we're asking for any reserved port (i.e. port == 0 &&
1671 * transport->xprt.resvport == 1) xs_get_srcport above will
1672 * ensure that port is non-zero and we will bind as needed.
1673 */
826799e6
BF		 1674 if (port <= 0)
1675 return port;
0f7a622c 1676
beb59b68 1677 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1678 do {
beb59b68
PE		 1679 rpc_set_port((struct sockaddr *)&myaddr, port);
1680 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1681 transport->xprt.addrlen);
a246b010 1682 if (err == 0) {
fbfffbd5 1683 transport->srcport = port;
d3bc9a1d 1684 break;
a246b010 1685 }
67a391d7 1686 last = port;
baaf4e48 1687 port = xs_next_srcport(transport, port);
67a391d7
TM		 1688 if (port > last)
1689 nloop++;
1690 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1691
4232e863 1692 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1693 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1694 &((struct sockaddr_in *)&myaddr)->sin_addr,
1695 port, err ? "failed" : "ok", err);
1696 else
1697 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1698 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1699 port, err ? "failed" : "ok", err);
a246b010
CL		 1700 return err;
1701}
1702
176e21ee
CL		 1703/*
1704 * We don't support autobind on AF_LOCAL sockets
1705 */
1706static void xs_local_rpcbind(struct rpc_task *task)
1707{
fb43d172 1708 xprt_set_bound(task->tk_xprt);
176e21ee
CL		 1709}
1710
1711static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1712{
1713}
beb59b68 1714
ed07536e
PZ		 1715#ifdef CONFIG_DEBUG_LOCK_ALLOC
1716static struct lock_class_key xs_key[2];
1717static struct lock_class_key xs_slock_key[2];
1718
176e21ee
CL		 1719static inline void xs_reclassify_socketu(struct socket *sock)
1720{
1721 struct sock *sk = sock->sk;
1722
176e21ee
CL		 1723 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1724 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1725}
1726
8945ee5e 1727static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1728{
1729 struct sock *sk = sock->sk;
8945ee5e 1730
8945ee5e
CL		 1731 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1732 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1733}
ed07536e 1734
8945ee5e
CL		 1735static inline void xs_reclassify_socket6(struct socket *sock)
1736{
1737 struct sock *sk = sock->sk;
ed07536e 1738
8945ee5e
CL		 1739 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1740 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1741}
6bc9638a
PE		 1742
1743static inline void xs_reclassify_socket(int family, struct socket *sock)
1744{
fafc4e1e 1745 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1b7a1819
WAA		 1746 return;
1747
4232e863 1748 switch (family) {
176e21ee
CL		 1749 case AF_LOCAL:
1750 xs_reclassify_socketu(sock);
1751 break;
4232e863 1752 case AF_INET:
6bc9638a 1753 xs_reclassify_socket4(sock);
4232e863
CL		 1754 break;
1755 case AF_INET6:
6bc9638a 1756 xs_reclassify_socket6(sock);
4232e863
CL		 1757 break;
1758 }
6bc9638a 1759}
ed07536e 1760#else
6bc9638a
PE		 1761static inline void xs_reclassify_socket(int family, struct socket *sock)
1762{
1763}
ed07536e
PZ		 1764#endif
1765
93dc41bd
N		 1766static void xs_dummy_setup_socket(struct work_struct *work)
1767{
1768}
1769
6bc9638a 1770static struct socket *xs_create_sock(struct rpc_xprt *xprt,
4dda9c8a
TM		 1771 struct sock_xprt *transport, int family, int type,
1772 int protocol, bool reuseport)
22f79326 1773{
a73881c9 1774 struct file *filp;
22f79326
PE		 1775 struct socket *sock;
1776 int err;
1777
6bc9638a 1778 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1779 if (err < 0) {
1780 dprintk("RPC: can't create %d transport socket (%d).\n",
1781 protocol, -err);
1782 goto out;
1783 }
6bc9638a 1784 xs_reclassify_socket(family, sock);
22f79326 1785
4dda9c8a 1786 if (reuseport)
fe31a326 1787 sock_set_reuseport(sock->sk);
4dda9c8a 1788
4cea288a
BH		 1789 err = xs_bind(transport, sock);
1790 if (err) {
22f79326
PE		 1791 sock_release(sock);
1792 goto out;
1793 }
1794
a73881c9
TM		 1795 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1796 if (IS_ERR(filp))
1797 return ERR_CAST(filp);
1798 transport->file = filp;
1799
22f79326
PE		 1800 return sock;
1801out:
1802 return ERR_PTR(err);
1803}
1804
176e21ee
CL		 1805static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1806 struct socket *sock)
1807{
1808 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1809 xprt);
1810
1811 if (!transport->inet) {
1812 struct sock *sk = sock->sk;
1813
1814 write_lock_bh(&sk->sk_callback_lock);
1815
1816 xs_save_old_callbacks(transport, sk);
1817
1818 sk->sk_user_data = xprt;
a2648094 1819 sk->sk_data_ready = xs_data_ready;
176e21ee 1820 sk->sk_write_space = xs_udp_write_space;
b4411457 1821 sock_set_flag(sk, SOCK_FASYNC);
2118071d 1822 sk->sk_error_report = xs_error_report;
176e21ee
CL		 1823
1824 xprt_clear_connected(xprt);
1825
1826 /* Reset to new socket */
1827 transport->sock = sock;
1828 transport->inet = sk;
1829
1830 write_unlock_bh(&sk->sk_callback_lock);
1831 }
1832
ae053551 1833 xs_stream_start_connect(transport);
6c7a64e5 1834
176e21ee
CL		 1835 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1836}
1837
1838/**
1839 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
176e21ee 1840 * @transport: socket transport to connect
176e21ee 1841 */
dc107402 1842static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1843{
176e21ee 1844 struct rpc_xprt *xprt = &transport->xprt;
a73881c9 1845 struct file *filp;
176e21ee 1846 struct socket *sock;
68e9a246 1847 int status;
176e21ee 1848
176e21ee
CL		 1849 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1850 SOCK_STREAM, 0, &sock, 1);
1851 if (status < 0) {
1852 dprintk("RPC: can't create AF_LOCAL "
1853 "transport socket (%d).\n", -status);
1854 goto out;
1855 }
d1358917 1856 xs_reclassify_socket(AF_LOCAL, sock);
176e21ee 1857
a73881c9
TM		 1858 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1859 if (IS_ERR(filp)) {
1860 status = PTR_ERR(filp);
1861 goto out;
1862 }
1863 transport->file = filp;
1864
176e21ee
CL		 1865 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1866 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1867
1868 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 1869 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 1870 switch (status) {
1871 case 0:
1872 dprintk("RPC: xprt %p connected to %s\n",
1873 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
3968a8a5
CL		 1874 xprt->stat.connect_count++;
1875 xprt->stat.connect_time += (long)jiffies -
1876 xprt->stat.connect_start;
176e21ee 1877 xprt_set_connected(xprt);
93f479d3 1878 break;
3601c4a9 1879 case -ENOBUFS:
176e21ee
CL		 1880 break;
1881 case -ENOENT:
1882 dprintk("RPC: xprt %p: socket %s does not exist\n",
1883 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1884 break;
4a20a988
TM		 1885 case -ECONNREFUSED:
1886 dprintk("RPC: xprt %p: connection refused for %s\n",
1887 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1888 break;
176e21ee
CL		 1889 default:
1890 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1891 __func__, -status,
1892 xprt->address_strings[RPC_DISPLAY_ADDR]);
1893 }
1894
1895out:
1896 xprt_clear_connecting(xprt);
1897 xprt_wake_pending_tasks(xprt, status);
dc107402
BF		 1898 return status;
1899}
1900
b6669737 1901static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1902{
dc107402
BF		 1903 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1904 int ret;
1905
1906 if (RPC_IS_ASYNC(task)) {
1907 /*
1908 * We want the AF_LOCAL connect to be resolved in the
1909 * filesystem namespace of the process making the rpc
1910 * call. Thus we connect synchronously.
1911 *
1912 * If we want to support asynchronous AF_LOCAL calls,
1913 * we'll need to figure out how to pass a namespace to
1914 * connect.
1915 */
5ad64b36 1916 task->tk_rpc_status = -ENOTCONN;
dc107402
BF		 1917 rpc_exit(task, -ENOTCONN);
1918 return;
1919 }
1920 ret = xs_local_setup_socket(transport);
1921 if (ret && !RPC_IS_SOFTCONN(task))
1922 msleep_interruptible(15000);
176e21ee
CL		 1923}
1924
3c87ef6e 1925#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
d6e971d8
JL		 1926/*
1927 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1928 * know that we have exclusive access to the socket), to guard against
1929 * races with xs_reset_transport.
1930 */
a564b8f0
MG		 1931static void xs_set_memalloc(struct rpc_xprt *xprt)
1932{
1933 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1934 xprt);
1935
d6e971d8
JL		 1936 /*
1937 * If there's no sock, then we have nothing to set. The
1938 * reconnecting process will get it for us.
1939 */
1940 if (!transport->inet)
1941 return;
8e228133 1942 if (atomic_read(&xprt->swapper))
a564b8f0
MG		 1943 sk_set_memalloc(transport->inet);
1944}
1945
1946/**
d67fa4d8 1947 * xs_enable_swap - Tag this transport as being used for swap.
a564b8f0 1948 * @xprt: transport to tag
a564b8f0 1949 *
8e228133
JL		 1950 * Take a reference to this transport on behalf of the rpc_clnt, and
1951 * optionally mark it for swapping if it wasn't already.
a564b8f0 1952 */
d67fa4d8
JL		 1953static int
1954xs_enable_swap(struct rpc_xprt *xprt)
a564b8f0 1955{
d6e971d8 1956 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
a564b8f0 1957
d6e971d8
JL		 1958 if (atomic_inc_return(&xprt->swapper) != 1)
1959 return 0;
1960 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1961 return -ERESTARTSYS;
1962 if (xs->inet)
1963 sk_set_memalloc(xs->inet);
1964 xprt_release_xprt(xprt, NULL);
8e228133
JL		 1965 return 0;
1966}
a564b8f0 1967
8e228133 1968/**
d67fa4d8 1969 * xs_disable_swap - Untag this transport as being used for swap.
8e228133
JL		 1970 * @xprt: transport to tag
1971 *
1972 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1973 * swapper refcount goes to 0, untag the socket as a memalloc socket.
1974 */
d67fa4d8
JL		 1975static void
1976xs_disable_swap(struct rpc_xprt *xprt)
8e228133 1977{
d6e971d8 1978 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
8e228133 1979
d6e971d8
JL		 1980 if (!atomic_dec_and_test(&xprt->swapper))
1981 return;
1982 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1983 return;
1984 if (xs->inet)
1985 sk_clear_memalloc(xs->inet);
1986 xprt_release_xprt(xprt, NULL);
a564b8f0 1987}
a564b8f0
MG		 1988#else
1989static void xs_set_memalloc(struct rpc_xprt *xprt)
1990{
1991}
d67fa4d8
JL		 1992
1993static int
1994xs_enable_swap(struct rpc_xprt *xprt)
1995{
1996 return -EINVAL;
1997}
1998
1999static void
2000xs_disable_swap(struct rpc_xprt *xprt)
2001{
2002}
a564b8f0
MG		 2003#endif
2004
16be2d20
CL		 2005static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2006{
2007 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2008
2009 if (!transport->inet) {
2010 struct sock *sk = sock->sk;
2011
2012 write_lock_bh(&sk->sk_callback_lock);
2013
2a9e1cfa
TM		 2014 xs_save_old_callbacks(transport, sk);
2015
16be2d20 2016 sk->sk_user_data = xprt;
f9b2ee71 2017 sk->sk_data_ready = xs_data_ready;
16be2d20 2018 sk->sk_write_space = xs_udp_write_space;
b4411457 2019 sock_set_flag(sk, SOCK_FASYNC);
16be2d20
CL		 2020
2021 xprt_set_connected(xprt);
2022
2023 /* Reset to new socket */
2024 transport->sock = sock;
2025 transport->inet = sk;
2026
a564b8f0
MG		 2027 xs_set_memalloc(xprt);
2028
16be2d20
CL		 2029 write_unlock_bh(&sk->sk_callback_lock);
2030 }
2031 xs_udp_do_set_buffer_size(xprt);
02910177
TM		 2032
2033 xprt->stat.connect_start = jiffies;
16be2d20
CL		 2034}
2035
8c14ff2a 2036static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2037{
34161db6
TM		 2038 struct sock_xprt *transport =
2039 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2040 struct rpc_xprt *xprt = &transport->xprt;
d099b8af 2041 struct socket *sock;
b65c0310 2042 int status = -EIO;
9903cd1c 2043
8c14ff2a 2044 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2045 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2046 IPPROTO_UDP, false);
b65c0310 2047 if (IS_ERR(sock))
b0d93ad5 2048 goto out;
68e220bd 2049
c740eff8
CL		 2050 dprintk("RPC: worker connecting xprt %p via %s to "
2051 "%s (port %s)\n", xprt,
2052 xprt->address_strings[RPC_DISPLAY_PROTO],
2053 xprt->address_strings[RPC_DISPLAY_ADDR],
2054 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2055
2056 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2057 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2058 status = 0;
2059out:
b0d93ad5 2060 xprt_clear_connecting(xprt);
cf76785d 2061 xprt_unlock_connect(xprt, transport);
7d1e8255 2062 xprt_wake_pending_tasks(xprt, status);
a246b010
CL		 2063}
2064
4876cc77
TM		 2065/**
2066 * xs_tcp_shutdown - gracefully shut down a TCP socket
2067 * @xprt: transport
2068 *
2069 * Initiates a graceful shutdown of the TCP socket by calling the
2070 * equivalent of shutdown(SHUT_RDWR);
2071 */
2072static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2073{
2074 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2075 struct socket *sock = transport->sock;
9b30889c 2076 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
4876cc77
TM		 2077
2078 if (sock == NULL)
2079 return;
9b30889c
TM		 2080 switch (skst) {
2081 default:
4876cc77
TM		 2082 kernel_sock_shutdown(sock, SHUT_RDWR);
2083 trace_rpc_socket_shutdown(xprt, sock);
9b30889c
TM		 2084 break;
2085 case TCP_CLOSE:
2086 case TCP_TIME_WAIT:
4876cc77 2087 xs_reset_transport(transport);
9b30889c 2088 }
4876cc77
TM		 2089}
2090
8d1b8c62
TM		 2091static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2092 struct socket *sock)
2093{
7196dbb0
TM		 2094 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2095 unsigned int keepidle;
2096 unsigned int keepcnt;
8d1b8c62
TM		 2097 unsigned int timeo;
2098
b5e92419 2099 spin_lock(&xprt->transport_lock);
7196dbb0
TM		 2100 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2101 keepcnt = xprt->timeout->to_retries + 1;
2102 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2103 (xprt->timeout->to_retries + 1);
2104 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
b5e92419 2105 spin_unlock(&xprt->transport_lock);
7196dbb0 2106
8d1b8c62 2107 /* TCP Keepalive options */
ce3d9544 2108 sock_set_keepalive(sock->sk);
71c48eb8 2109 tcp_sock_set_keepidle(sock->sk, keepidle);
d41ecaac 2110 tcp_sock_set_keepintvl(sock->sk, keepidle);
480aeb96 2111 tcp_sock_set_keepcnt(sock->sk, keepcnt);
8d1b8c62
TM		 2112
2113 /* TCP user timeout (see RFC5482) */
c488aead 2114 tcp_sock_set_user_timeout(sock->sk, timeo);
8d1b8c62
TM		 2115}
2116
7196dbb0
TM		 2117static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2118 unsigned long connect_timeout,
2119 unsigned long reconnect_timeout)
2120{
2121 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2122 struct rpc_timeout to;
2123 unsigned long initval;
2124
b5e92419 2125 spin_lock(&xprt->transport_lock);
7196dbb0
TM		 2126 if (reconnect_timeout < xprt->max_reconnect_timeout)
2127 xprt->max_reconnect_timeout = reconnect_timeout;
2128 if (connect_timeout < xprt->connect_timeout) {
2129 memcpy(&to, xprt->timeout, sizeof(to));
2130 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2131 /* Arbitrary lower limit */
2132 if (initval < XS_TCP_INIT_REEST_TO << 1)
2133 initval = XS_TCP_INIT_REEST_TO << 1;
2134 to.to_initval = initval;
2135 to.to_maxval = initval;
2136 memcpy(&transport->tcp_timeout, &to,
2137 sizeof(transport->tcp_timeout));
2138 xprt->timeout = &transport->tcp_timeout;
2139 xprt->connect_timeout = connect_timeout;
2140 }
2141 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
b5e92419 2142 spin_unlock(&xprt->transport_lock);
7196dbb0
TM		 2143}
2144
16be2d20 2145static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2146{
16be2d20 2147 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2148 int ret = -ENOTCONN;
edb267a6 2149
ee0ac0c2 2150 if (!transport->inet) {
b0d93ad5 2151 struct sock *sk = sock->sk;
7f260e85 2152
d88e4d82
N		 2153 /* Avoid temporary address, they are bad for long-lived
2154 * connections such as NFS mounts.
2155 * RFC4941, section 3.6 suggests that:
2156 * Individual applications, which have specific
2157 * knowledge about the normal duration of connections,
2158 * MAY override this as appropriate.
2159 */
18d5ad62
CH		 2160 if (xs_addr(xprt)->sa_family == PF_INET6) {
2161 ip6_sock_set_addr_preferences(sk,
2162 IPV6_PREFER_SRC_PUBLIC);
2163 }
d88e4d82 2164
8d1b8c62 2165 xs_tcp_set_socket_timeouts(xprt, sock);
775f06ab 2166
b0d93ad5
CL		 2167 write_lock_bh(&sk->sk_callback_lock);
2168
2a9e1cfa
TM		 2169 xs_save_old_callbacks(transport, sk);
2170
b0d93ad5 2171 sk->sk_user_data = xprt;
5157b956 2172 sk->sk_data_ready = xs_data_ready;
b0d93ad5
CL		 2173 sk->sk_state_change = xs_tcp_state_change;
2174 sk->sk_write_space = xs_tcp_write_space;
b4411457 2175 sock_set_flag(sk, SOCK_FASYNC);
2118071d 2176 sk->sk_error_report = xs_error_report;
3167e12c
CL		 2177
2178 /* socket options */
3167e12c 2179 sock_reset_flag(sk, SOCK_LINGER);
3167e12c 2180 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2181
2182 xprt_clear_connected(xprt);
2183
2184 /* Reset to new socket */
ee0ac0c2
CL		 2185 transport->sock = sock;
2186 transport->inet = sk;
b0d93ad5
CL		 2187
2188 write_unlock_bh(&sk->sk_callback_lock);
2189 }
2190
01d37c42 2191 if (!xprt_bound(xprt))
fe19a96b 2192 goto out;
01d37c42 2193
a564b8f0
MG		 2194 xs_set_memalloc(xprt);
2195
ae053551 2196 xs_stream_start_connect(transport);
e1806c7b 2197
b0d93ad5 2198 /* Tell the socket layer to start connecting... */
0fdea1e8 2199 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
fe19a96b
TM		 2200 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2201 switch (ret) {
2202 case 0:
4dda9c8a 2203 xs_set_srcport(transport, sock);
df561f66 2204 fallthrough;
fe19a96b
TM		 2205 case -EINPROGRESS:
2206 /* SYN_SENT! */
fe19a96b
TM		 2207 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2208 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1f4c17a0
TM		 2209 break;
2210 case -EADDRNOTAVAIL:
2211 /* Source port number is unavailable. Try a new one! */
2212 transport->srcport = 0;
fe19a96b
TM		 2213 }
2214out:
2215 return ret;
16be2d20
CL		 2216}
2217
9903cd1c 2218/**
b61d59ff 2219 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
acf0a39f 2220 * @work: queued work item
9903cd1c
CL		 2221 *
2222 * Invoked by a work queue tasklet.
a246b010 2223 */
cdd518d5 2224static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2225{
cdd518d5
PE		 2226 struct sock_xprt *transport =
2227 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2228 struct socket *sock = transport->sock;
a9f5f0f7 2229 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2230 int status = -EIO;
a246b010 2231
ee0ac0c2 2232 if (!sock) {
cdd518d5 2233 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2234 xs_addr(xprt)->sa_family, SOCK_STREAM,
2235 IPPROTO_TCP, true);
b61d59ff
TM		 2236 if (IS_ERR(sock)) {
2237 status = PTR_ERR(sock);
3167e12c
CL		 2238 goto out;
2239 }
7d1e8255 2240 }
a246b010 2241
c740eff8
CL		 2242 dprintk("RPC: worker connecting xprt %p via %s to "
2243 "%s (port %s)\n", xprt,
2244 xprt->address_strings[RPC_DISPLAY_PROTO],
2245 xprt->address_strings[RPC_DISPLAY_ADDR],
2246 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2247
16be2d20 2248 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2249 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2250 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2251 xprt, -status, xprt_connected(xprt),
2252 sock->sk->sk_state);
2a491991 2253 switch (status) {
f75e6745
TM		 2254 default:
2255 printk("%s: connect returned unhandled error %d\n",
2256 __func__, status);
df561f66 2257 fallthrough;
f75e6745
TM		 2258 case -EADDRNOTAVAIL:
2259 /* We're probably in TIME_WAIT. Get rid of existing socket,
2260 * and retry
2261 */
a519fc7a 2262 xs_tcp_force_close(xprt);
88b5ed73 2263 break;
2a491991
TM		 2264 case 0:
2265 case -EINPROGRESS:
2266 case -EALREADY:
718ba5b8 2267 xprt_unlock_connect(xprt, transport);
7d1e8255 2268 return;
9fcfe0c8
TM		 2269 case -EINVAL:
2270 /* Happens, for instance, if the user specified a link
2271 * local IPv6 address without a scope-id.
2272 */
3ed5e2a2
TM		 2273 case -ECONNREFUSED:
2274 case -ECONNRESET:
eb5b46fa 2275 case -ENETDOWN:
3ed5e2a2 2276 case -ENETUNREACH:
4ba161a7 2277 case -EHOSTUNREACH:
3913c78c 2278 case -EADDRINUSE:
3601c4a9 2279 case -ENOBUFS:
8c71139d
CM		 2280 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2281 * We need to wake them first to ensure the correct error code.
6ea44adc
N		 2282 */
2283 xprt_wake_pending_tasks(xprt, status);
4efdd92c 2284 xs_tcp_force_close(xprt);
9fcfe0c8 2285 goto out;
a246b010 2286 }
2a491991 2287 status = -EAGAIN;
a246b010 2288out:
68e220bd 2289 xprt_clear_connecting(xprt);
cf76785d 2290 xprt_unlock_connect(xprt, transport);
7d1e8255 2291 xprt_wake_pending_tasks(xprt, status);
68e220bd 2292}
b0d93ad5 2293
9903cd1c
CL		 2294/**
2295 * xs_connect - connect a socket to a remote endpoint
1b092092 2296 * @xprt: pointer to transport structure
9903cd1c
CL		 2297 * @task: address of RPC task that manages state of connect request
2298 *
2299 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2300 *
2301 * UDP socket connects are synchronous, but we use a work queue anyway
2302 * to guarantee that even unprivileged user processes can set up a
2303 * socket on a privileged port.
2304 *
2305 * If a UDP socket connect fails, the delay behavior here prevents
2306 * retry floods (hard mounts).
9903cd1c 2307 */
1b092092 2308static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2309{
ee0ac0c2 2310 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
02910177 2311 unsigned long delay = 0;
a246b010 2312
718ba5b8
TM		 2313 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2314
99b1a4c3 2315 if (transport->sock != NULL) {
46121cf7
CL		 2316 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2317 "seconds\n",
03bf4b70 2318 xprt, xprt->reestablish_timeout / HZ);
99b1a4c3
TM		 2319
2320 /* Start by resetting any existing state */
2321 xs_reset_transport(transport);
2322
675dd90a
CL		 2323 delay = xprt_reconnect_delay(xprt);
2324 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
02910177 2325
02910177 2326 } else
46121cf7 2327 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
02910177
TM		 2328
2329 queue_delayed_work(xprtiod_workqueue,
2330 &transport->connect_worker,
2331 delay);
a246b010
CL		 2332}
2333
4f8943f8
TM		 2334static void xs_wake_disconnect(struct sock_xprt *transport)
2335{
2336 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2337 xs_tcp_force_close(&transport->xprt);
2338}
2339
2340static void xs_wake_write(struct sock_xprt *transport)
2341{
2342 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2343 xprt_write_space(&transport->xprt);
2344}
2345
2346static void xs_wake_error(struct sock_xprt *transport)
2347{
2348 int sockerr;
4f8943f8
TM		 2349
2350 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2351 return;
2352 mutex_lock(&transport->recv_mutex);
2353 if (transport->sock == NULL)
2354 goto out;
2355 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2356 goto out;
af84537d 2357 sockerr = xchg(&transport->xprt_err, 0);
4f8943f8
TM		 2358 if (sockerr < 0)
2359 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2360out:
2361 mutex_unlock(&transport->recv_mutex);
2362}
2363
2364static void xs_wake_pending(struct sock_xprt *transport)
2365{
2366 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2367 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2368}
2369
2370static void xs_error_handle(struct work_struct *work)
2371{
2372 struct sock_xprt *transport = container_of(work,
2373 struct sock_xprt, error_worker);
2374
2375 xs_wake_disconnect(transport);
2376 xs_wake_write(transport);
2377 xs_wake_error(transport);
2378 xs_wake_pending(transport);
2379}
2380
176e21ee 2381/**
12b20ce3 2382 * xs_local_print_stats - display AF_LOCAL socket-specific stats
176e21ee
CL		 2383 * @xprt: rpc_xprt struct containing statistics
2384 * @seq: output file
2385 *
2386 */
2387static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2388{
2389 long idle_time = 0;
2390
2391 if (xprt_connected(xprt))
2392 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2393
2394 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2395 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2396 xprt->stat.bind_count,
2397 xprt->stat.connect_count,
8440a886 2398 xprt->stat.connect_time / HZ,
176e21ee
CL		 2399 idle_time,
2400 xprt->stat.sends,
2401 xprt->stat.recvs,
2402 xprt->stat.bad_xids,
2403 xprt->stat.req_u,
15a45206
AA		 2404 xprt->stat.bklog_u,
2405 xprt->stat.max_slots,
2406 xprt->stat.sending_u,
2407 xprt->stat.pending_u);
176e21ee
CL		 2408}
2409
262ca07d 2410/**
12b20ce3 2411 * xs_udp_print_stats - display UDP socket-specific stats
262ca07d
CL		 2412 * @xprt: rpc_xprt struct containing statistics
2413 * @seq: output file
2414 *
2415 */
2416static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2417{
c8475461
CL		 2418 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2419
15a45206
AA		 2420 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2421 "%lu %llu %llu\n",
fbfffbd5 2422 transport->srcport,
262ca07d
CL		 2423 xprt->stat.bind_count,
2424 xprt->stat.sends,
2425 xprt->stat.recvs,
2426 xprt->stat.bad_xids,
2427 xprt->stat.req_u,
15a45206
AA		 2428 xprt->stat.bklog_u,
2429 xprt->stat.max_slots,
2430 xprt->stat.sending_u,
2431 xprt->stat.pending_u);
262ca07d
CL		 2432}
2433
2434/**
12b20ce3 2435 * xs_tcp_print_stats - display TCP socket-specific stats
262ca07d
CL		 2436 * @xprt: rpc_xprt struct containing statistics
2437 * @seq: output file
2438 *
2439 */
2440static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2441{
c8475461 2442 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2443 long idle_time = 0;
2444
2445 if (xprt_connected(xprt))
2446 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2447
15a45206
AA		 2448 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2449 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2450 transport->srcport,
262ca07d
CL		 2451 xprt->stat.bind_count,
2452 xprt->stat.connect_count,
8440a886 2453 xprt->stat.connect_time / HZ,
262ca07d
CL		 2454 idle_time,
2455 xprt->stat.sends,
2456 xprt->stat.recvs,
2457 xprt->stat.bad_xids,
2458 xprt->stat.req_u,
15a45206
AA		 2459 xprt->stat.bklog_u,
2460 xprt->stat.max_slots,
2461 xprt->stat.sending_u,
2462 xprt->stat.pending_u);
262ca07d
CL		 2463}
2464
4cfc7e60
RI		 2465/*
2466 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2467 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2468 * to use the server side send routines.
2469 */
5fe6eaa1 2470static int bc_malloc(struct rpc_task *task)
4cfc7e60 2471{
5fe6eaa1
CL		 2472 struct rpc_rqst *rqst = task->tk_rqstp;
2473 size_t size = rqst->rq_callsize;
4cfc7e60
RI		 2474 struct page *page;
2475 struct rpc_buffer *buf;
2476
5fe6eaa1
CL		 2477 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2478 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2479 size);
2480 return -EINVAL;
2481 }
4cfc7e60 2482
b8a13d03 2483 page = alloc_page(GFP_KERNEL);
4cfc7e60 2484 if (!page)
5fe6eaa1 2485 return -ENOMEM;
4cfc7e60
RI		 2486
2487 buf = page_address(page);
2488 buf->len = PAGE_SIZE;
2489
5fe6eaa1 2490 rqst->rq_buffer = buf->data;
18e601d6 2491 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
5fe6eaa1 2492 return 0;
4cfc7e60
RI		 2493}
2494
2495/*
2496 * Free the space allocated in the bc_alloc routine
2497 */
3435c74a 2498static void bc_free(struct rpc_task *task)
4cfc7e60 2499{
3435c74a 2500 void *buffer = task->tk_rqstp->rq_buffer;
4cfc7e60
RI		 2501 struct rpc_buffer *buf;
2502
4cfc7e60
RI		 2503 buf = container_of(buffer, struct rpc_buffer, data);
2504 free_page((unsigned long)buf);
2505}
2506
4cfc7e60
RI		 2507static int bc_sendto(struct rpc_rqst *req)
2508{
da1661b9 2509 struct xdr_buf *xdr = &req->rq_snd_buf;
4cfc7e60 2510 struct sock_xprt *transport =
067fb11b 2511 container_of(req->rq_xprt, struct sock_xprt, xprt);
067fb11b 2512 struct msghdr msg = {
da1661b9 2513 .msg_flags = 0,
067fb11b
CL		 2514 };
2515 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
da1661b9
CL		 2516 (u32)xdr->len);
2517 unsigned int sent = 0;
2518 int err;
4cfc7e60 2519
8729aaba 2520 req->rq_xtime = ktime_get();
da1661b9
CL		 2521 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2522 xdr_free_bvec(xdr);
2523 if (err < 0 || sent != (xdr->len + sizeof(marker)))
067fb11b 2524 return -EAGAIN;
da1661b9 2525 return sent;
4cfc7e60
RI		 2526}
2527
ca4faf54
CL		 2528/**
2529 * bc_send_request - Send a backchannel Call on a TCP socket
2530 * @req: rpc_rqst containing Call message to be sent
2531 *
2532 * xpt_mutex ensures @rqstp's whole message is written to the socket
2533 * without interruption.
2534 *
2535 * Return values:
2536 * %0 if the message was sent successfully
2537 * %ENOTCONN if the message was not sent
4cfc7e60 2538 */
adfa7144 2539static int bc_send_request(struct rpc_rqst *req)
4cfc7e60 2540{
4cfc7e60 2541 struct svc_xprt *xprt;
7fc56136 2542 int len;
4cfc7e60 2543
4cfc7e60
RI		 2544 /*
2545 * Get the server socket associated with this callback xprt
2546 */
2547 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2548
2549 /*
2550 * Grab the mutex to serialize data as the connection is shared
2551 * with the fore channel
2552 */
c544577d 2553 mutex_lock(&xprt->xpt_mutex);
4cfc7e60
RI		 2554 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2555 len = -ENOTCONN;
2556 else
2557 len = bc_sendto(req);
2558 mutex_unlock(&xprt->xpt_mutex);
2559
2560 if (len > 0)
2561 len = 0;
2562
2563 return len;
2564}
2565
2566/*
2567 * The close routine. Since this is client initiated, we do nothing
2568 */
2569
2570static void bc_close(struct rpc_xprt *xprt)
2571{
6221f1d9 2572 xprt_disconnect_done(xprt);
4cfc7e60
RI		 2573}
2574
2575/*
2576 * The xprt destroy routine. Again, because this connection is client
2577 * initiated, we do nothing
2578 */
2579
2580static void bc_destroy(struct rpc_xprt *xprt)
2581{
47f72efa
KM		 2582 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2583
2584 xs_xprt_free(xprt);
2585 module_put(THIS_MODULE);
4cfc7e60
RI		 2586}
2587
d31ae254 2588static const struct rpc_xprt_ops xs_local_ops = {
176e21ee 2589 .reserve_xprt = xprt_reserve_xprt,
4cd34e7c 2590 .release_xprt = xprt_release_xprt,
f39c1bfb 2591 .alloc_slot = xprt_alloc_slot,
a9cde23a 2592 .free_slot = xprt_free_slot,
176e21ee
CL		 2593 .rpcbind = xs_local_rpcbind,
2594 .set_port = xs_local_set_port,
dc107402 2595 .connect = xs_local_connect,
176e21ee
CL		 2596 .buf_alloc = rpc_malloc,
2597 .buf_free = rpc_free,
550aebfe 2598 .prepare_request = xs_stream_prepare_request,
176e21ee 2599 .send_request = xs_local_send_request,
8ba6a92d 2600 .wait_for_reply_request = xprt_wait_for_reply_request_def,
176e21ee 2601 .close = xs_close,
a1311d87 2602 .destroy = xs_destroy,
176e21ee 2603 .print_stats = xs_local_print_stats,
d67fa4d8
JL		 2604 .enable_swap = xs_enable_swap,
2605 .disable_swap = xs_disable_swap,
176e21ee
CL		 2606};
2607
d31ae254 2608static const struct rpc_xprt_ops xs_udp_ops = {
43118c29 2609 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2610 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2611 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2612 .alloc_slot = xprt_alloc_slot,
a9cde23a 2613 .free_slot = xprt_free_slot,
45160d62 2614 .rpcbind = rpcb_getport_async,
92200412 2615 .set_port = xs_set_port,
262965f5 2616 .connect = xs_connect,
02107148
CL		 2617 .buf_alloc = rpc_malloc,
2618 .buf_free = rpc_free,
262965f5 2619 .send_request = xs_udp_send_request,
8ba6a92d 2620 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
46c0ee8b 2621 .timer = xs_udp_timer,
a58dd398 2622 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2623 .close = xs_close,
2624 .destroy = xs_destroy,
262ca07d 2625 .print_stats = xs_udp_print_stats,
d67fa4d8
JL		 2626 .enable_swap = xs_enable_swap,
2627 .disable_swap = xs_disable_swap,
4a068258 2628 .inject_disconnect = xs_inject_disconnect,
262965f5
CL		 2629};
2630
d31ae254 2631static const struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2632 .reserve_xprt = xprt_reserve_xprt,
4cd34e7c 2633 .release_xprt = xprt_release_xprt,
36bd7de9 2634 .alloc_slot = xprt_alloc_slot,
a9cde23a 2635 .free_slot = xprt_free_slot,
45160d62 2636 .rpcbind = rpcb_getport_async,
92200412 2637 .set_port = xs_set_port,
0b9e7943 2638 .connect = xs_connect,
02107148
CL		 2639 .buf_alloc = rpc_malloc,
2640 .buf_free = rpc_free,
277e4ab7 2641 .prepare_request = xs_stream_prepare_request,
262965f5 2642 .send_request = xs_tcp_send_request,
8ba6a92d 2643 .wait_for_reply_request = xprt_wait_for_reply_request_def,
c627d31b 2644 .close = xs_tcp_shutdown,
9903cd1c 2645 .destroy = xs_destroy,
7196dbb0 2646 .set_connect_timeout = xs_tcp_set_connect_timeout,
262ca07d 2647 .print_stats = xs_tcp_print_stats,
d67fa4d8
JL		 2648 .enable_swap = xs_enable_swap,
2649 .disable_swap = xs_disable_swap,
4a068258 2650 .inject_disconnect = xs_inject_disconnect,
42e5c3e2
CL		 2651#ifdef CONFIG_SUNRPC_BACKCHANNEL
2652 .bc_setup = xprt_setup_bc,
6b26cc8c 2653 .bc_maxpayload = xs_tcp_bc_maxpayload,
7402a4fe 2654 .bc_num_slots = xprt_bc_max_slots,
42e5c3e2
CL		 2655 .bc_free_rqst = xprt_free_bc_rqst,
2656 .bc_destroy = xprt_destroy_bc,
2657#endif
a246b010
CL		 2658};
2659
4cfc7e60
RI		 2660/*
2661 * The rpc_xprt_ops for the server backchannel
2662 */
2663
d31ae254 2664static const struct rpc_xprt_ops bc_tcp_ops = {
4cfc7e60
RI		 2665 .reserve_xprt = xprt_reserve_xprt,
2666 .release_xprt = xprt_release_xprt,
84e28a30 2667 .alloc_slot = xprt_alloc_slot,
a9cde23a 2668 .free_slot = xprt_free_slot,
4cfc7e60
RI		 2669 .buf_alloc = bc_malloc,
2670 .buf_free = bc_free,
2671 .send_request = bc_send_request,
8ba6a92d 2672 .wait_for_reply_request = xprt_wait_for_reply_request_def,
4cfc7e60
RI		 2673 .close = bc_close,
2674 .destroy = bc_destroy,
2675 .print_stats = xs_tcp_print_stats,
d67fa4d8
JL		 2676 .enable_swap = xs_enable_swap,
2677 .disable_swap = xs_disable_swap,
4a068258 2678 .inject_disconnect = xs_inject_disconnect,
4cfc7e60
RI		 2679};
2680
92476850
CL		 2681static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2682{
2683 static const struct sockaddr_in sin = {
2684 .sin_family = AF_INET,
2685 .sin_addr.s_addr = htonl(INADDR_ANY),
2686 };
2687 static const struct sockaddr_in6 sin6 = {
2688 .sin6_family = AF_INET6,
2689 .sin6_addr = IN6ADDR_ANY_INIT,
2690 };
2691
2692 switch (family) {
176e21ee
CL		 2693 case AF_LOCAL:
2694 break;
92476850
CL		 2695 case AF_INET:
2696 memcpy(sap, &sin, sizeof(sin));
2697 break;
2698 case AF_INET6:
2699 memcpy(sap, &sin6, sizeof(sin6));
2700 break;
2701 default:
2702 dprintk("RPC: %s: Bad address family\n", __func__);
2703 return -EAFNOSUPPORT;
2704 }
2705 return 0;
2706}
2707
3c341b0b 2708static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2709 unsigned int slot_table_size,
2710 unsigned int max_slot_table_size)
c8541ecd
CL		 2711{
2712 struct rpc_xprt *xprt;
ffc2e518 2713 struct sock_xprt *new;
c8541ecd 2714
96802a09 2715 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2716 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2717 return ERR_PTR(-EBADF);
2718 }
2719
d9ba131d
TM		 2720 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2721 max_slot_table_size);
bd1722d4 2722 if (xprt == NULL) {
46121cf7
CL		 2723 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2724 "rpc_xprt\n");
c8541ecd
CL		 2725 return ERR_PTR(-ENOMEM);
2726 }
c8541ecd 2727
bd1722d4 2728 new = container_of(xprt, struct sock_xprt, xprt);
edc1b01c 2729 mutex_init(&new->recv_mutex);
96802a09
FM		 2730 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2731 xprt->addrlen = args->addrlen;
d3bc9a1d 2732 if (args->srcaddr)
fbfffbd5 2733 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2734 else {
2735 int err;
2736 err = xs_init_anyaddr(args->dstaddr->sa_family,
2737 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2738 if (err != 0) {
2739 xprt_free(xprt);
92476850 2740 return ERR_PTR(err);
2aa13531 2741 }
92476850 2742 }
c8541ecd
CL		 2743
2744 return xprt;
2745}
2746
176e21ee
CL		 2747static const struct rpc_timeout xs_local_default_timeout = {
2748 .to_initval = 10 * HZ,
2749 .to_maxval = 10 * HZ,
2750 .to_retries = 2,
2751};
2752
2753/**
2754 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2755 * @args: rpc transport creation arguments
2756 *
2757 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2758 */
2759static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2760{
2761 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2762 struct sock_xprt *transport;
2763 struct rpc_xprt *xprt;
2764 struct rpc_xprt *ret;
2765
d9ba131d
TM		 2766 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2767 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2768 if (IS_ERR(xprt))
2769 return xprt;
2770 transport = container_of(xprt, struct sock_xprt, xprt);
2771
2772 xprt->prot = 0;
176e21ee
CL		 2773 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2774
2775 xprt->bind_timeout = XS_BIND_TO;
2776 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2777 xprt->idle_timeout = XS_IDLE_DISC_TO;
2778
2779 xprt->ops = &xs_local_ops;
2780 xprt->timeout = &xs_local_default_timeout;
2781
550aebfe 2782 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
4f8943f8 2783 INIT_WORK(&transport->error_worker, xs_error_handle);
550aebfe 2784 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
93dc41bd 2785
176e21ee
CL		 2786 switch (sun->sun_family) {
2787 case AF_LOCAL:
2788 if (sun->sun_path[0] != '/') {
2789 dprintk("RPC: bad AF_LOCAL address: %s\n",
2790 sun->sun_path);
2791 ret = ERR_PTR(-EINVAL);
2792 goto out_err;
2793 }
2794 xprt_set_bound(xprt);
176e21ee 2795 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2796 ret = ERR_PTR(xs_local_setup_socket(transport));
2797 if (ret)
2798 goto out_err;
176e21ee
CL		 2799 break;
2800 default:
2801 ret = ERR_PTR(-EAFNOSUPPORT);
2802 goto out_err;
2803 }
2804
2805 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2806 xprt->address_strings[RPC_DISPLAY_ADDR]);
2807
2808 if (try_module_get(THIS_MODULE))
2809 return xprt;
2810 ret = ERR_PTR(-EINVAL);
2811out_err:
315f3812 2812 xs_xprt_free(xprt);
176e21ee
CL		 2813 return ret;
2814}
2815
2881ae74
TM		 2816static const struct rpc_timeout xs_udp_default_timeout = {
2817 .to_initval = 5 * HZ,
2818 .to_maxval = 30 * HZ,
2819 .to_increment = 5 * HZ,
2820 .to_retries = 5,
2821};
2822
9903cd1c
CL		 2823/**
2824 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2825 * @args: rpc transport creation arguments
9903cd1c
CL		 2826 *
2827 */
483066d6 2828static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2829{
8f9d5b1a 2830 struct sockaddr *addr = args->dstaddr;
c8541ecd 2831 struct rpc_xprt *xprt;
c8475461 2832 struct sock_xprt *transport;
0a68b0be 2833 struct rpc_xprt *ret;
a246b010 2834
d9ba131d
TM		 2835 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2836 xprt_udp_slot_table_entries);
c8541ecd
CL		 2837 if (IS_ERR(xprt))
2838 return xprt;
c8475461 2839 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2840
ec739ef0 2841 xprt->prot = IPPROTO_UDP;
a246b010
CL		 2842 /* XXX: header size can vary due to auth type, IPv6, etc. */
2843 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2844
03bf4b70 2845 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2846 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2847 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2848
262965f5 2849 xprt->ops = &xs_udp_ops;
a246b010 2850
ba7392bb 2851 xprt->timeout = &xs_udp_default_timeout;
a246b010 2852
f9b2ee71 2853 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
4f8943f8 2854 INIT_WORK(&transport->error_worker, xs_error_handle);
edc1b01c
TM		 2855 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2856
8f9d5b1a
CL		 2857 switch (addr->sa_family) {
2858 case AF_INET:
2859 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2860 xprt_set_bound(xprt);
2861
9dc3b095 2862 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2863 break;
2864 case AF_INET6:
2865 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2866 xprt_set_bound(xprt);
2867
9dc3b095 2868 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2869 break;
2870 default:
0a68b0be
BF		 2871 ret = ERR_PTR(-EAFNOSUPPORT);
2872 goto out_err;
8f9d5b1a
CL		 2873 }
2874
c740eff8
CL		 2875 if (xprt_bound(xprt))
2876 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2877 xprt->address_strings[RPC_DISPLAY_ADDR],
2878 xprt->address_strings[RPC_DISPLAY_PORT],
2879 xprt->address_strings[RPC_DISPLAY_PROTO]);
2880 else
2881 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2882 xprt->address_strings[RPC_DISPLAY_ADDR],
2883 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2884
bc25571e
TT		 2885 if (try_module_get(THIS_MODULE))
2886 return xprt;
0a68b0be
BF		 2887 ret = ERR_PTR(-EINVAL);
2888out_err:
315f3812 2889 xs_xprt_free(xprt);
0a68b0be 2890 return ret;
a246b010
CL		 2891}
2892
2881ae74
TM		 2893static const struct rpc_timeout xs_tcp_default_timeout = {
2894 .to_initval = 60 * HZ,
2895 .to_maxval = 60 * HZ,
2896 .to_retries = 2,
2897};
2898
9903cd1c
CL		 2899/**
2900 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2901 * @args: rpc transport creation arguments
9903cd1c
CL		 2902 *
2903 */
483066d6 2904static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2905{
8f9d5b1a 2906 struct sockaddr *addr = args->dstaddr;
c8541ecd 2907 struct rpc_xprt *xprt;
c8475461 2908 struct sock_xprt *transport;
0a68b0be 2909 struct rpc_xprt *ret;
b7993ceb
TM		 2910 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2911
2912 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2913 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 2914
d9ba131d 2915 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 2916 max_slot_table_size);
c8541ecd
CL		 2917 if (IS_ERR(xprt))
2918 return xprt;
c8475461 2919 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2920
ec739ef0 2921 xprt->prot = IPPROTO_TCP;
808012fb 2922 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2923
03bf4b70 2924 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2925 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2926 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2927
262965f5 2928 xprt->ops = &xs_tcp_ops;
ba7392bb 2929 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2930
3851f1cd 2931 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
7196dbb0
TM		 2932 xprt->connect_timeout = xprt->timeout->to_initval *
2933 (xprt->timeout->to_retries + 1);
3851f1cd 2934
c50b8ee0 2935 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
4f8943f8 2936 INIT_WORK(&transport->error_worker, xs_error_handle);
edc1b01c
TM		 2937 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2938
8f9d5b1a
CL		 2939 switch (addr->sa_family) {
2940 case AF_INET:
2941 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2942 xprt_set_bound(xprt);
2943
9dc3b095 2944 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2945 break;
2946 case AF_INET6:
2947 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2948 xprt_set_bound(xprt);
2949
9dc3b095 2950 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2951 break;
2952 default:
0a68b0be
BF		 2953 ret = ERR_PTR(-EAFNOSUPPORT);
2954 goto out_err;
8f9d5b1a
CL		 2955 }
2956
c740eff8
CL		 2957 if (xprt_bound(xprt))
2958 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2959 xprt->address_strings[RPC_DISPLAY_ADDR],
2960 xprt->address_strings[RPC_DISPLAY_PORT],
2961 xprt->address_strings[RPC_DISPLAY_PROTO]);
2962 else
2963 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2964 xprt->address_strings[RPC_DISPLAY_ADDR],
2965 xprt->address_strings[RPC_DISPLAY_PROTO]);
2966
bc25571e
TT		 2967 if (try_module_get(THIS_MODULE))
2968 return xprt;
0a68b0be
BF		 2969 ret = ERR_PTR(-EINVAL);
2970out_err:
315f3812 2971 xs_xprt_free(xprt);
0a68b0be 2972 return ret;
a246b010 2973}
282b32e1 2974
f300baba
AB		 2975/**
2976 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2977 * @args: rpc transport creation arguments
2978 *
2979 */
2980static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2981{
2982 struct sockaddr *addr = args->dstaddr;
2983 struct rpc_xprt *xprt;
2984 struct sock_xprt *transport;
2985 struct svc_sock *bc_sock;
0a68b0be 2986 struct rpc_xprt *ret;
f300baba 2987
d9ba131d
TM		 2988 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2989 xprt_tcp_slot_table_entries);
f300baba
AB		 2990 if (IS_ERR(xprt))
2991 return xprt;
2992 transport = container_of(xprt, struct sock_xprt, xprt);
2993
2994 xprt->prot = IPPROTO_TCP;
f300baba
AB		 2995 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2996 xprt->timeout = &xs_tcp_default_timeout;
2997
2998 /* backchannel */
2999 xprt_set_bound(xprt);
3000 xprt->bind_timeout = 0;
f300baba
AB		 3001 xprt->reestablish_timeout = 0;
3002 xprt->idle_timeout = 0;
3003
f300baba
AB		 3004 xprt->ops = &bc_tcp_ops;
3005
3006 switch (addr->sa_family) {
3007 case AF_INET:
3008 xs_format_peer_addresses(xprt, "tcp",
3009 RPCBIND_NETID_TCP);
3010 break;
3011 case AF_INET6:
3012 xs_format_peer_addresses(xprt, "tcp",
3013 RPCBIND_NETID_TCP6);
3014 break;
3015 default:
0a68b0be
BF		 3016 ret = ERR_PTR(-EAFNOSUPPORT);
3017 goto out_err;
f300baba
AB		 3018 }
3019
50fa0d40
PE		 3020 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3021 xprt->address_strings[RPC_DISPLAY_ADDR],
3022 xprt->address_strings[RPC_DISPLAY_PORT],
3023 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 3024
99de8ea9
BF		 3025 /*
3026 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 3027 * we want to keep it around as long as the connection lasts,
3028 * in case we need to start using it for a backchannel again;
3029 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 3030 */
3031 xprt_get(xprt);
3032 args->bc_xprt->xpt_bc_xprt = xprt;
3033 xprt->bc_xprt = args->bc_xprt;
3034 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3035 transport->sock = bc_sock->sk_sock;
3036 transport->inet = bc_sock->sk_sk;
3037
f300baba
AB		 3038 /*
3039 * Since we don't want connections for the backchannel, we set
3040 * the xprt status to connected
3041 */
3042 xprt_set_connected(xprt);
3043
f300baba
AB		 3044 if (try_module_get(THIS_MODULE))
3045 return xprt;
642aab58
KM		 3046
3047 args->bc_xprt->xpt_bc_xprt = NULL;
39a9beab 3048 args->bc_xprt->xpt_bc_xps = NULL;
99de8ea9 3049 xprt_put(xprt);
0a68b0be
BF		 3050 ret = ERR_PTR(-EINVAL);
3051out_err:
315f3812 3052 xs_xprt_free(xprt);
0a68b0be 3053 return ret;
f300baba
AB		 3054}
3055
176e21ee
CL		 3056static struct xprt_class xs_local_transport = {
3057 .list = LIST_HEAD_INIT(xs_local_transport.list),
3058 .name = "named UNIX socket",
3059 .owner = THIS_MODULE,
3060 .ident = XPRT_TRANSPORT_LOCAL,
3061 .setup = xs_setup_local,
d5aa6b22 3062 .netid = { "" },
176e21ee
CL		 3063};
3064
bc25571e
TT		 3065static struct xprt_class xs_udp_transport = {
3066 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3067 .name = "udp",
3068 .owner = THIS_MODULE,
f300baba 3069 .ident = XPRT_TRANSPORT_UDP,
bc25571e 3070 .setup = xs_setup_udp,
d5aa6b22 3071 .netid = { "udp", "udp6", "" },
bc25571e
TT		 3072};
3073
3074static struct xprt_class xs_tcp_transport = {
3075 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3076 .name = "tcp",
3077 .owner = THIS_MODULE,
f300baba 3078 .ident = XPRT_TRANSPORT_TCP,
bc25571e 3079 .setup = xs_setup_tcp,
d5aa6b22 3080 .netid = { "tcp", "tcp6", "" },
bc25571e
TT		 3081};
3082
f300baba
AB		 3083static struct xprt_class xs_bc_tcp_transport = {
3084 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3085 .name = "tcp NFSv4.1 backchannel",
3086 .owner = THIS_MODULE,
3087 .ident = XPRT_TRANSPORT_BC_TCP,
3088 .setup = xs_setup_bc_tcp,
d5aa6b22 3089 .netid = { "" },
f300baba
AB		 3090};
3091
282b32e1 3092/**
bc25571e 3093 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 3094 *
3095 */
3096int init_socket_xprt(void)
3097{
2b1bec5f 3098 if (!sunrpc_table_header)
0b4d4147 3099 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683 3100
176e21ee 3101 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 3102 xprt_register_transport(&xs_udp_transport);
3103 xprt_register_transport(&xs_tcp_transport);
f300baba 3104 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 3105
282b32e1
CL		 3106 return 0;
3107}
3108
3109/**
bc25571e 3110 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 3111 *
3112 */
3113void cleanup_socket_xprt(void)
3114{
fbf76683
CL		 3115 if (sunrpc_table_header) {
3116 unregister_sysctl_table(sunrpc_table_header);
3117 sunrpc_table_header = NULL;
3118 }
bc25571e 3119
176e21ee 3120 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 3121 xprt_unregister_transport(&xs_udp_transport);
3122 xprt_unregister_transport(&xs_tcp_transport);
f300baba 3123 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 3124}
cbf11071 3125
9bbb9e5a
RR		 3126static int param_set_uint_minmax(const char *val,
3127 const struct kernel_param *kp,
cbf11071
TM		 3128 unsigned int min, unsigned int max)
3129{
00cfaa94 3130 unsigned int num;
cbf11071
TM		 3131 int ret;
3132
3133 if (!val)
3134 return -EINVAL;
00cfaa94 3135 ret = kstrtouint(val, 0, &num);
9761a246
DC		 3136 if (ret)
3137 return ret;
3138 if (num < min || num > max)
cbf11071
TM		 3139 return -EINVAL;
3140 *((unsigned int *)kp->arg) = num;
3141 return 0;
3142}
3143
9bbb9e5a 3144static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071 3145{
ffb6ca33 3146 return param_set_uint_minmax(val, kp,
826799e6 3147 RPC_MIN_RESVPORT,
cbf11071
TM		 3148 RPC_MAX_RESVPORT);
3149}
3150
9c27847d 3151static const struct kernel_param_ops param_ops_portnr = {
9bbb9e5a
RR		 3152 .set = param_set_portnr,
3153 .get = param_get_uint,
3154};
3155
cbf11071
TM		 3156#define param_check_portnr(name, p) \
3157 __param_check(name, p, unsigned int);
3158
3159module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3160module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3161
9bbb9e5a
RR		 3162static int param_set_slot_table_size(const char *val,
3163 const struct kernel_param *kp)
cbf11071
TM		 3164{
3165 return param_set_uint_minmax(val, kp,
3166 RPC_MIN_SLOT_TABLE,
3167 RPC_MAX_SLOT_TABLE);
3168}
3169
9c27847d 3170static const struct kernel_param_ops param_ops_slot_table_size = {
9bbb9e5a
RR		 3171 .set = param_set_slot_table_size,
3172 .get = param_get_uint,
3173};
3174
cbf11071
TM		 3175#define param_check_slot_table_size(name, p) \
3176 __param_check(name, p, unsigned int);
3177
d9ba131d
TM		 3178static int param_set_max_slot_table_size(const char *val,
3179 const struct kernel_param *kp)
3180{
3181 return param_set_uint_minmax(val, kp,
3182 RPC_MIN_SLOT_TABLE,
3183 RPC_MAX_SLOT_TABLE_LIMIT);
3184}
3185
9c27847d 3186static const struct kernel_param_ops param_ops_max_slot_table_size = {
d9ba131d
TM		 3187 .set = param_set_max_slot_table_size,
3188 .get = param_get_uint,
3189};
3190
3191#define param_check_max_slot_table_size(name, p) \
3192 __param_check(name, p, unsigned int);
3193
cbf11071
TM		 3194module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3195 slot_table_size, 0644);
d9ba131d
TM		 3196module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3197 max_slot_table_size, 0644);
cbf11071
TM		 3198module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3199 slot_table_size, 0644);
Linux 6.x block layer and io_uring tree(s)