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Linux 4.14-rc6
[linux-block.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
5976687a 36#include <linux/sunrpc/addr.h>
02107148 37#include <linux/sunrpc/sched.h>
4cfc7e60 38#include <linux/sunrpc/svcsock.h>
49c36fcc 39#include <linux/sunrpc/xprtsock.h>
a246b010 40#include <linux/file.h>
9e00abc3 41#ifdef CONFIG_SUNRPC_BACKCHANNEL
44b98efd
RL		 42#include <linux/sunrpc/bc_xprt.h>
43#endif
a246b010
CL		 44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
40b5ea0c
TM		 50#include <trace/events/sunrpc.h>
51
4cfc7e60 52#include "sunrpc.h"
176e21ee
CL		 53
54static void xs_close(struct rpc_xprt *xprt);
7196dbb0
TM		 55static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
56 struct socket *sock);
176e21ee 57
c556b754
CL		 58/*
59 * xprtsock tunables
60 */
09acfea5
TM		 61static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
62static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
63static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 64
09acfea5
TM		 65static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
66static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 67
54c09874
TM		 68#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
69
7d1e8255 70#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 71static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 72
fbf76683
CL		 73/*
74 * We can register our own files under /proc/sys/sunrpc by
75 * calling register_sysctl_table() again. The files in that
76 * directory become the union of all files registered there.
77 *
78 * We simply need to make sure that we don't collide with
79 * someone else's file names!
80 */
81
fbf76683
CL		 82static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
83static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 84static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 85static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
86static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
87
88static struct ctl_table_header *sunrpc_table_header;
89
90/*
91 * FIXME: changing the UDP slot table size should also resize the UDP
92 * socket buffers for existing UDP transports
93 */
fe2c6338 94static struct ctl_table xs_tunables_table[] = {
fbf76683 95 {
fbf76683
CL		 96 .procname = "udp_slot_table_entries",
97 .data = &xprt_udp_slot_table_entries,
98 .maxlen = sizeof(unsigned int),
99 .mode = 0644,
6d456111 100 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 101 .extra1 = &min_slot_table_size,
102 .extra2 = &max_slot_table_size
103 },
104 {
fbf76683
CL		 105 .procname = "tcp_slot_table_entries",
106 .data = &xprt_tcp_slot_table_entries,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
6d456111 109 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 110 .extra1 = &min_slot_table_size,
111 .extra2 = &max_slot_table_size
112 },
d9ba131d
TM		 113 {
114 .procname = "tcp_max_slot_table_entries",
115 .data = &xprt_max_tcp_slot_table_entries,
116 .maxlen = sizeof(unsigned int),
117 .mode = 0644,
118 .proc_handler = proc_dointvec_minmax,
119 .extra1 = &min_slot_table_size,
120 .extra2 = &max_tcp_slot_table_limit
121 },
fbf76683 122 {
fbf76683
CL		 123 .procname = "min_resvport",
124 .data = &xprt_min_resvport,
125 .maxlen = sizeof(unsigned int),
126 .mode = 0644,
6d456111 127 .proc_handler = proc_dointvec_minmax,
fbf76683 128 .extra1 = &xprt_min_resvport_limit,
e08ea3a9 129 .extra2 = &xprt_max_resvport
fbf76683
CL		 130 },
131 {
fbf76683
CL		 132 .procname = "max_resvport",
133 .data = &xprt_max_resvport,
134 .maxlen = sizeof(unsigned int),
135 .mode = 0644,
6d456111 136 .proc_handler = proc_dointvec_minmax,
e08ea3a9 137 .extra1 = &xprt_min_resvport,
fbf76683
CL		 138 .extra2 = &xprt_max_resvport_limit
139 },
25fe6142
TM		 140 {
141 .procname = "tcp_fin_timeout",
142 .data = &xs_tcp_fin_timeout,
143 .maxlen = sizeof(xs_tcp_fin_timeout),
144 .mode = 0644,
6d456111 145 .proc_handler = proc_dointvec_jiffies,
fbf76683 146 },
f8572d8f 147 { },
fbf76683
CL		 148};
149
fe2c6338 150static struct ctl_table sunrpc_table[] = {
fbf76683 151 {
fbf76683
CL		 152 .procname = "sunrpc",
153 .mode = 0555,
154 .child = xs_tunables_table
155 },
f8572d8f 156 { },
fbf76683
CL		 157};
158
159#endif
160
03bf4b70
CL		 161/*
162 * Wait duration for a reply from the RPC portmapper.
163 */
164#define XS_BIND_TO (60U * HZ)
165
166/*
167 * Delay if a UDP socket connect error occurs. This is most likely some
168 * kind of resource problem on the local host.
169 */
170#define XS_UDP_REEST_TO (2U * HZ)
171
172/*
173 * The reestablish timeout allows clients to delay for a bit before attempting
174 * to reconnect to a server that just dropped our connection.
175 *
176 * We implement an exponential backoff when trying to reestablish a TCP
177 * transport connection with the server. Some servers like to drop a TCP
178 * connection when they are overworked, so we start with a short timeout and
179 * increase over time if the server is down or not responding.
180 */
181#define XS_TCP_INIT_REEST_TO (3U * HZ)
03bf4b70
CL		 182
183/*
184 * TCP idle timeout; client drops the transport socket if it is idle
185 * for this long. Note that we also timeout UDP sockets to prevent
186 * holding port numbers when there is no RPC traffic.
187 */
188#define XS_IDLE_DISC_TO (5U * 60 * HZ)
189
f895b252 190#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
a246b010 191# undef RPC_DEBUG_DATA
9903cd1c 192# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 193#endif
194
a246b010 195#ifdef RPC_DEBUG_DATA
9903cd1c 196static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 197{
9903cd1c
CL		 198 u8 *buf = (u8 *) packet;
199 int j;
a246b010 200
46121cf7 201 dprintk("RPC: %s\n", msg);
a246b010
CL		 202 for (j = 0; j < count && j < 128; j += 4) {
203 if (!(j & 31)) {
204 if (j)
205 dprintk("\n");
206 dprintk("0x%04x ", j);
207 }
208 dprintk("%02x%02x%02x%02x ",
209 buf[j], buf[j+1], buf[j+2], buf[j+3]);
210 }
211 dprintk("\n");
212}
213#else
9903cd1c 214static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 215{
216 /* NOP */
217}
218#endif
219
2118071d
TM		 220static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
221{
222 return (struct rpc_xprt *) sk->sk_user_data;
223}
224
95392c59
CL		 225static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
226{
227 return (struct sockaddr *) &xprt->addr;
228}
229
176e21ee
CL		 230static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
231{
232 return (struct sockaddr_un *) &xprt->addr;
233}
234
95392c59 235static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 236{
95392c59
CL		 237 return (struct sockaddr_in *) &xprt->addr;
238}
239
240static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
241{
242 return (struct sockaddr_in6 *) &xprt->addr;
243}
244
c877b849 245static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 246{
c877b849 247 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 248 struct sockaddr_in6 *sin6;
249 struct sockaddr_in *sin;
176e21ee 250 struct sockaddr_un *sun;
c877b849 251 char buf[128];
edb267a6 252
9dc3b095 253 switch (sap->sa_family) {
176e21ee
CL		 254 case AF_LOCAL:
255 sun = xs_addr_un(xprt);
256 strlcpy(buf, sun->sun_path, sizeof(buf));
257 xprt->address_strings[RPC_DISPLAY_ADDR] =
258 kstrdup(buf, GFP_KERNEL);
259 break;
9dc3b095 260 case AF_INET:
176e21ee
CL		 261 (void)rpc_ntop(sap, buf, sizeof(buf));
262 xprt->address_strings[RPC_DISPLAY_ADDR] =
263 kstrdup(buf, GFP_KERNEL);
9dc3b095 264 sin = xs_addr_in(xprt);
fc0b5791 265 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 266 break;
267 case AF_INET6:
176e21ee
CL		 268 (void)rpc_ntop(sap, buf, sizeof(buf));
269 xprt->address_strings[RPC_DISPLAY_ADDR] =
270 kstrdup(buf, GFP_KERNEL);
9dc3b095 271 sin6 = xs_addr_in6(xprt);
fc0b5791 272 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 273 break;
274 default:
275 BUG();
756805e7 276 }
176e21ee 277
9dc3b095 278 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 279}
280
9dc3b095 281static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 282{
9dc3b095
CL		 283 struct sockaddr *sap = xs_addr(xprt);
284 char buf[128];
4b6473fb 285
81160e66 286 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 287 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 288
81160e66 289 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 290 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
291}
4b6473fb 292
9dc3b095
CL		 293static void xs_format_peer_addresses(struct rpc_xprt *xprt,
294 const char *protocol,
295 const char *netid)
c877b849 296{
b454ae90 297 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 298 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 299 xs_format_common_peer_addresses(xprt);
9dc3b095 300 xs_format_common_peer_ports(xprt);
edb267a6 301}
4b6473fb 302
9dc3b095 303static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 304{
9dc3b095
CL		 305 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
306 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 307
9dc3b095 308 xs_format_common_peer_ports(xprt);
edb267a6
CL		 309}
310
311static void xs_free_peer_addresses(struct rpc_xprt *xprt)
312{
33e01dc7
CL		 313 unsigned int i;
314
315 for (i = 0; i < RPC_DISPLAY_MAX; i++)
316 switch (i) {
317 case RPC_DISPLAY_PROTO:
318 case RPC_DISPLAY_NETID:
319 continue;
320 default:
321 kfree(xprt->address_strings[i]);
322 }
edb267a6
CL		 323}
324
b4b5cc85
CL		 325#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
326
24c5684b 327static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 328{
b4b5cc85
CL		 329 struct msghdr msg = {
330 .msg_name = addr,
331 .msg_namelen = addrlen,
24c5684b
TM		 332 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
333 };
334 struct kvec iov = {
335 .iov_base = vec->iov_base + base,
336 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 337 };
338
24c5684b 339 if (iov.iov_len != 0)
b4b5cc85
CL		 340 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
341 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
342}
343
f279cd00 344static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
b4b5cc85 345{
a6b31d18
TM		 346 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
347 int offset, size_t size, int flags);
24c5684b
TM		 348 struct page **ppage;
349 unsigned int remainder;
f279cd00 350 int err;
24c5684b
TM		 351
352 remainder = xdr->page_len - base;
353 base += xdr->page_base;
354 ppage = xdr->pages + (base >> PAGE_SHIFT);
355 base &= ~PAGE_MASK;
a6b31d18
TM		 356 do_sendpage = sock->ops->sendpage;
357 if (!zerocopy)
358 do_sendpage = sock_no_sendpage;
24c5684b
TM		 359 for(;;) {
360 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
361 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 362
24c5684b 363 remainder -= len;
31303d6c 364 if (more)
24c5684b 365 flags |= MSG_MORE;
31303d6c
TM		 366 if (remainder != 0)
367 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
a6b31d18 368 err = do_sendpage(sock, *ppage, base, len, flags);
24c5684b
TM		 369 if (remainder == 0 || err != len)
370 break;
f279cd00 371 *sent_p += err;
24c5684b
TM		 372 ppage++;
373 base = 0;
374 }
f279cd00
JB		 375 if (err > 0) {
376 *sent_p += err;
377 err = 0;
378 }
379 return err;
b4b5cc85
CL		 380}
381
9903cd1c
CL		 382/**
383 * xs_sendpages - write pages directly to a socket
384 * @sock: socket to send on
385 * @addr: UDP only -- address of destination
386 * @addrlen: UDP only -- length of destination address
387 * @xdr: buffer containing this request
388 * @base: starting position in the buffer
a6b31d18 389 * @zerocopy: true if it is safe to use sendpage()
f279cd00 390 * @sent_p: return the total number of bytes successfully queued for sending
9903cd1c 391 *
a246b010 392 */
f279cd00 393static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
a246b010 394{
24c5684b 395 unsigned int remainder = xdr->len - base;
f279cd00
JB		 396 int err = 0;
397 int sent = 0;
a246b010 398
262965f5 399 if (unlikely(!sock))
fba91afb 400 return -ENOTSOCK;
262965f5 401
24c5684b
TM		 402 if (base != 0) {
403 addr = NULL;
404 addrlen = 0;
405 }
262965f5 406
24c5684b
TM		 407 if (base < xdr->head[0].iov_len || addr != NULL) {
408 unsigned int len = xdr->head[0].iov_len - base;
409 remainder -= len;
410 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
411 if (remainder == 0 || err != len)
a246b010 412 goto out;
f279cd00 413 *sent_p += err;
a246b010
CL		 414 base = 0;
415 } else
24c5684b 416 base -= xdr->head[0].iov_len;
a246b010 417
24c5684b
TM		 418 if (base < xdr->page_len) {
419 unsigned int len = xdr->page_len - base;
420 remainder -= len;
f279cd00
JB		 421 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
422 *sent_p += sent;
423 if (remainder == 0 || sent != len)
a246b010
CL		 424 goto out;
425 base = 0;
24c5684b
TM		 426 } else
427 base -= xdr->page_len;
428
429 if (base >= xdr->tail[0].iov_len)
f279cd00 430 return 0;
24c5684b 431 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 432out:
f279cd00
JB		 433 if (err > 0) {
434 *sent_p += err;
435 err = 0;
436 }
437 return err;
a246b010
CL		 438}
439
b6ddf64f
TM		 440static void xs_nospace_callback(struct rpc_task *task)
441{
442 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
443
444 transport->inet->sk_write_pending--;
b6ddf64f
TM		 445}
446
9903cd1c 447/**
262965f5
CL		 448 * xs_nospace - place task on wait queue if transmit was incomplete
449 * @task: task to put to sleep
9903cd1c 450 *
a246b010 451 */
5e3771ce 452static int xs_nospace(struct rpc_task *task)
a246b010 453{
262965f5
CL		 454 struct rpc_rqst *req = task->tk_rqstp;
455 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 456 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
06ea0bfe 457 struct sock *sk = transport->inet;
24ca9a84 458 int ret = -EAGAIN;
a246b010 459
46121cf7 460 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 461 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
462 req->rq_slen);
463
b6ddf64f
TM		 464 /* Protect against races with write_space */
465 spin_lock_bh(&xprt->transport_lock);
466
467 /* Don't race with disconnect */
468 if (xprt_connected(xprt)) {
13331a55
TM		 469 /* wait for more buffer space */
470 sk->sk_write_pending++;
471 xprt_wait_for_buffer_space(task, xs_nospace_callback);
472 } else
5e3771ce 473 ret = -ENOTCONN;
262965f5 474
b6ddf64f 475 spin_unlock_bh(&xprt->transport_lock);
06ea0bfe
TM		 476
477 /* Race breaker in case memory is freed before above code is called */
d48f9ce7
DV		 478 if (ret == -EAGAIN) {
479 struct socket_wq *wq;
480
481 rcu_read_lock();
482 wq = rcu_dereference(sk->sk_wq);
483 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
484 rcu_read_unlock();
485
486 sk->sk_write_space(sk);
487 }
5e3771ce 488 return ret;
262965f5
CL		 489}
490
61677eee
CL		 491/*
492 * Construct a stream transport record marker in @buf.
493 */
494static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
495{
496 u32 reclen = buf->len - sizeof(rpc_fraghdr);
497 rpc_fraghdr *base = buf->head[0].iov_base;
498 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
499}
500
176e21ee
CL		 501/**
502 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
503 * @task: RPC task that manages the state of an RPC request
504 *
505 * Return values:
506 * 0: The request has been sent
507 * EAGAIN: The socket was blocked, please call again later to
508 * complete the request
509 * ENOTCONN: Caller needs to invoke connect logic then call again
510 * other: Some other error occured, the request was not sent
511 */
512static int xs_local_send_request(struct rpc_task *task)
513{
514 struct rpc_rqst *req = task->tk_rqstp;
515 struct rpc_xprt *xprt = req->rq_xprt;
516 struct sock_xprt *transport =
517 container_of(xprt, struct sock_xprt, xprt);
518 struct xdr_buf *xdr = &req->rq_snd_buf;
519 int status;
f279cd00 520 int sent = 0;
176e21ee
CL		 521
522 xs_encode_stream_record_marker(&req->rq_snd_buf);
523
524 xs_pktdump("packet data:",
525 req->rq_svec->iov_base, req->rq_svec->iov_len);
526
f279cd00
JB		 527 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
528 true, &sent);
176e21ee
CL		 529 dprintk("RPC: %s(%u) = %d\n",
530 __func__, xdr->len - req->rq_bytes_sent, status);
743c69e7
N		 531
532 if (status == -EAGAIN && sock_writeable(transport->inet))
533 status = -ENOBUFS;
534
f279cd00
JB		 535 if (likely(sent > 0) || status == 0) {
536 req->rq_bytes_sent += sent;
537 req->rq_xmit_bytes_sent += sent;
176e21ee
CL		 538 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
539 req->rq_bytes_sent = 0;
540 return 0;
541 }
542 status = -EAGAIN;
543 }
544
545 switch (status) {
3601c4a9 546 case -ENOBUFS:
b5872f0c 547 break;
176e21ee
CL		 548 case -EAGAIN:
549 status = xs_nospace(task);
550 break;
551 default:
552 dprintk("RPC: sendmsg returned unrecognized error %d\n",
553 -status);
554 case -EPIPE:
555 xs_close(xprt);
556 status = -ENOTCONN;
557 }
558
559 return status;
560}
561
262965f5
CL		 562/**
563 * xs_udp_send_request - write an RPC request to a UDP socket
564 * @task: address of RPC task that manages the state of an RPC request
565 *
566 * Return values:
567 * 0: The request has been sent
568 * EAGAIN: The socket was blocked, please call again later to
569 * complete the request
570 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 571 * other: Some other error occurred, the request was not sent
262965f5
CL		 572 */
573static int xs_udp_send_request(struct rpc_task *task)
574{
575 struct rpc_rqst *req = task->tk_rqstp;
576 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 578 struct xdr_buf *xdr = &req->rq_snd_buf;
f279cd00 579 int sent = 0;
262965f5 580 int status;
a246b010 581
9903cd1c 582 xs_pktdump("packet data:",
a246b010
CL		 583 req->rq_svec->iov_base,
584 req->rq_svec->iov_len);
585
01d37c42
TM		 586 if (!xprt_bound(xprt))
587 return -ENOTCONN;
f279cd00
JB		 588 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
589 xdr, req->rq_bytes_sent, true, &sent);
a246b010 590
46121cf7 591 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 592 xdr->len - req->rq_bytes_sent, status);
a246b010 593
3dedbb5c
JB		 594 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
595 if (status == -EPERM)
596 goto process_status;
597
743c69e7
N		 598 if (status == -EAGAIN && sock_writeable(transport->inet))
599 status = -ENOBUFS;
600
f279cd00
JB		 601 if (sent > 0 || status == 0) {
602 req->rq_xmit_bytes_sent += sent;
603 if (sent >= req->rq_slen)
2199700f
TM		 604 return 0;
605 /* Still some bytes left; set up for a retry later. */
262965f5 606 status = -EAGAIN;
2199700f 607 }
a246b010 608
3dedbb5c 609process_status:
262965f5 610 switch (status) {
fba91afb
TM		 611 case -ENOTSOCK:
612 status = -ENOTCONN;
613 /* Should we call xs_close() here? */
614 break;
b6ddf64f 615 case -EAGAIN:
5e3771ce 616 status = xs_nospace(task);
b6ddf64f 617 break;
262965f5 618 case -ENETUNREACH:
3601c4a9 619 case -ENOBUFS:
262965f5 620 case -EPIPE:
a246b010 621 case -ECONNREFUSED:
3dedbb5c 622 case -EPERM:
a246b010 623 /* When the server has died, an ICMP port unreachable message
9903cd1c 624 * prompts ECONNREFUSED. */
13331a55
TM		 625 break;
626 default:
627 dprintk("RPC: sendmsg returned unrecognized error %d\n",
628 -status);
a246b010 629 }
5fe46e9d 630
262965f5 631 return status;
a246b010
CL		 632}
633
9903cd1c 634/**
262965f5 635 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 636 * @task: address of RPC task that manages the state of an RPC request
637 *
638 * Return values:
262965f5
CL		 639 * 0: The request has been sent
640 * EAGAIN: The socket was blocked, please call again later to
641 * complete the request
642 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 643 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 644 *
645 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 646 * if sendmsg is not able to make progress?
9903cd1c 647 */
262965f5 648static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 649{
650 struct rpc_rqst *req = task->tk_rqstp;
651 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 652 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 653 struct xdr_buf *xdr = &req->rq_snd_buf;
a6b31d18 654 bool zerocopy = true;
9ffadfbc 655 bool vm_wait = false;
b595bb15 656 int status;
f279cd00 657 int sent;
a246b010 658
61677eee 659 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 660
262965f5
CL		 661 xs_pktdump("packet data:",
662 req->rq_svec->iov_base,
663 req->rq_svec->iov_len);
a6b31d18
TM		 664 /* Don't use zero copy if this is a resend. If the RPC call
665 * completes while the socket holds a reference to the pages,
666 * then we may end up resending corrupted data.
667 */
668 if (task->tk_flags & RPC_TASK_SENT)
669 zerocopy = false;
a246b010 670
7196dbb0
TM		 671 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
672 xs_tcp_set_socket_timeouts(xprt, transport->sock);
673
a246b010
CL		 674 /* Continue transmitting the packet/record. We must be careful
675 * to cope with writespace callbacks arriving _after_ we have
262965f5 676 * called sendmsg(). */
a246b010 677 while (1) {
f279cd00
JB		 678 sent = 0;
679 status = xs_sendpages(transport->sock, NULL, 0, xdr,
680 req->rq_bytes_sent, zerocopy, &sent);
a246b010 681
46121cf7 682 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 683 xdr->len - req->rq_bytes_sent, status);
a246b010 684
262965f5
CL		 685 /* If we've sent the entire packet, immediately
686 * reset the count of bytes sent. */
f279cd00
JB		 687 req->rq_bytes_sent += sent;
688 req->rq_xmit_bytes_sent += sent;
262965f5
CL		 689 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
690 req->rq_bytes_sent = 0;
691 return 0;
692 }
a246b010 693
9ffadfbc
TM		 694 WARN_ON_ONCE(sent == 0 && status == 0);
695
696 if (status == -EAGAIN ) {
697 /*
698 * Return EAGAIN if we're sure we're hitting the
699 * socket send buffer limits.
700 */
701 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
702 break;
703 /*
704 * Did we hit a memory allocation failure?
705 */
706 if (sent == 0) {
707 status = -ENOBUFS;
708 if (vm_wait)
709 break;
710 /* Retry, knowing now that we're below the
711 * socket send buffer limit
712 */
713 vm_wait = true;
714 }
715 continue;
716 }
f580dd04
TM		 717 if (status < 0)
718 break;
9ffadfbc 719 vm_wait = false;
a246b010
CL		 720 }
721
262965f5 722 switch (status) {
fba91afb
TM		 723 case -ENOTSOCK:
724 status = -ENOTCONN;
725 /* Should we call xs_close() here? */
726 break;
262965f5 727 case -EAGAIN:
5e3771ce 728 status = xs_nospace(task);
262965f5 729 break;
262965f5 730 case -ECONNRESET:
2a9e1cfa 731 case -ECONNREFUSED:
262965f5 732 case -ENOTCONN:
3913c78c 733 case -EADDRINUSE:
b5872f0c 734 case -ENOBUFS:
b9d2bb2e 735 case -EPIPE:
13331a55
TM		 736 break;
737 default:
738 dprintk("RPC: sendmsg returned unrecognized error %d\n",
739 -status);
a246b010 740 }
5fe46e9d 741
a246b010
CL		 742 return status;
743}
744
e0ab53de
TM		 745/**
746 * xs_tcp_release_xprt - clean up after a tcp transmission
747 * @xprt: transport
748 * @task: rpc task
749 *
750 * This cleans up if an error causes us to abort the transmission of a request.
751 * In this case, the socket may need to be reset in order to avoid confusing
752 * the server.
753 */
754static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
755{
756 struct rpc_rqst *req;
757
758 if (task != xprt->snd_task)
759 return;
760 if (task == NULL)
761 goto out_release;
762 req = task->tk_rqstp;
43cedbf0
TM		 763 if (req == NULL)
764 goto out_release;
e0ab53de
TM		 765 if (req->rq_bytes_sent == 0)
766 goto out_release;
767 if (req->rq_bytes_sent == req->rq_snd_buf.len)
768 goto out_release;
a4f0835c 769 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 770out_release:
771 xprt_release_xprt(xprt, task);
772}
773
2a9e1cfa
TM		 774static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
775{
776 transport->old_data_ready = sk->sk_data_ready;
777 transport->old_state_change = sk->sk_state_change;
778 transport->old_write_space = sk->sk_write_space;
2118071d 779 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 780}
781
782static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
783{
784 sk->sk_data_ready = transport->old_data_ready;
785 sk->sk_state_change = transport->old_state_change;
786 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 787 sk->sk_error_report = transport->old_error_report;
788}
789
42d42a5b
TM		 790static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
791{
792 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
793
794 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
795}
796
b70ae915
TM		 797static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
798{
799 smp_mb__before_atomic();
800 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
801 clear_bit(XPRT_CLOSING, &xprt->state);
42d42a5b 802 xs_sock_reset_state_flags(xprt);
b70ae915
TM		 803 smp_mb__after_atomic();
804}
805
806static void xs_sock_mark_closed(struct rpc_xprt *xprt)
807{
808 xs_sock_reset_connection_flags(xprt);
809 /* Mark transport as closed and wake up all pending tasks */
810 xprt_disconnect_done(xprt);
811}
812
2118071d
TM		 813/**
814 * xs_error_report - callback to handle TCP socket state errors
815 * @sk: socket
816 *
817 * Note: we don't call sock_error() since there may be a rpc_task
818 * using the socket, and so we don't want to clear sk->sk_err.
819 */
820static void xs_error_report(struct sock *sk)
821{
822 struct rpc_xprt *xprt;
823 int err;
824
825 read_lock_bh(&sk->sk_callback_lock);
826 if (!(xprt = xprt_from_sock(sk)))
827 goto out;
828
829 err = -sk->sk_err;
830 if (err == 0)
831 goto out;
b70ae915
TM		 832 /* Is this a reset event? */
833 if (sk->sk_state == TCP_CLOSE)
834 xs_sock_mark_closed(xprt);
2118071d
TM		 835 dprintk("RPC: xs_error_report client %p, error=%d...\n",
836 xprt, -err);
e8353c76 837 trace_rpc_socket_error(xprt, sk->sk_socket, err);
2118071d
TM		 838 xprt_wake_pending_tasks(xprt, err);
839 out:
840 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 841}
842
fe315e76 843static void xs_reset_transport(struct sock_xprt *transport)
a246b010 844{
ee0ac0c2
CL		 845 struct socket *sock = transport->sock;
846 struct sock *sk = transport->inet;
6cc7e908 847 struct rpc_xprt *xprt = &transport->xprt;
a246b010 848
fe315e76
CL		 849 if (sk == NULL)
850 return;
9903cd1c 851
264d1df3
JL		 852 if (atomic_read(&transport->xprt.swapper))
853 sk_clear_memalloc(sk);
854
09939204
TM		 855 kernel_sock_shutdown(sock, SHUT_RDWR);
856
edc1b01c 857 mutex_lock(&transport->recv_mutex);
a246b010 858 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 859 transport->inet = NULL;
860 transport->sock = NULL;
a246b010 861
9903cd1c 862 sk->sk_user_data = NULL;
2a9e1cfa
TM		 863
864 xs_restore_old_callbacks(transport, sk);
0c78789e 865 xprt_clear_connected(xprt);
a246b010 866 write_unlock_bh(&sk->sk_callback_lock);
6cc7e908 867 xs_sock_reset_connection_flags(xprt);
edc1b01c 868 mutex_unlock(&transport->recv_mutex);
a246b010 869
6cc7e908 870 trace_rpc_socket_close(xprt, sock);
a246b010 871 sock_release(sock);
fe315e76
CL		 872}
873
874/**
875 * xs_close - close a socket
876 * @xprt: transport
877 *
878 * This is used when all requests are complete; ie, no DRC state remains
879 * on the server we want to save.
f75e6745
TM		 880 *
881 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
882 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 883 */
884static void xs_close(struct rpc_xprt *xprt)
885{
886 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
887
888 dprintk("RPC: xs_close xprt %p\n", xprt);
889
890 xs_reset_transport(transport);
61d0a8e6 891 xprt->reestablish_timeout = 0;
fe315e76 892
62da3b24 893 xprt_disconnect_done(xprt);
a246b010
CL		 894}
895
4a068258
CL		 896static void xs_inject_disconnect(struct rpc_xprt *xprt)
897{
898 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
899 xprt);
900 xprt_disconnect_done(xprt);
901}
902
315f3812
KM		 903static void xs_xprt_free(struct rpc_xprt *xprt)
904{
905 xs_free_peer_addresses(xprt);
906 xprt_free(xprt);
907}
908
9903cd1c
CL		 909/**
910 * xs_destroy - prepare to shutdown a transport
911 * @xprt: doomed transport
912 *
913 */
914static void xs_destroy(struct rpc_xprt *xprt)
a246b010 915{
03c78827
TM		 916 struct sock_xprt *transport = container_of(xprt,
917 struct sock_xprt, xprt);
46121cf7 918 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 919
03c78827 920 cancel_delayed_work_sync(&transport->connect_worker);
a1311d87 921 xs_close(xprt);
edc1b01c 922 cancel_work_sync(&transport->recv_worker);
315f3812 923 xs_xprt_free(xprt);
a1311d87 924 module_put(THIS_MODULE);
a246b010
CL		 925}
926
176e21ee
CL		 927static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
928{
929 struct xdr_skb_reader desc = {
930 .skb = skb,
931 .offset = sizeof(rpc_fraghdr),
932 .count = skb->len - sizeof(rpc_fraghdr),
933 };
934
935 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
936 return -1;
937 if (desc.count)
938 return -1;
939 return 0;
940}
941
942/**
a2648094
TM		 943 * xs_local_data_read_skb
944 * @xprt: transport
945 * @sk: socket
946 * @skb: skbuff
176e21ee
CL		 947 *
948 * Currently this assumes we can read the whole reply in a single gulp.
949 */
a2648094
TM		 950static void xs_local_data_read_skb(struct rpc_xprt *xprt,
951 struct sock *sk,
952 struct sk_buff *skb)
176e21ee
CL		 953{
954 struct rpc_task *task;
176e21ee 955 struct rpc_rqst *rovr;
a2648094 956 int repsize, copied;
176e21ee
CL		 957 u32 _xid;
958 __be32 *xp;
959
176e21ee
CL		 960 repsize = skb->len - sizeof(rpc_fraghdr);
961 if (repsize < 4) {
962 dprintk("RPC: impossible RPC reply size %d\n", repsize);
a2648094 963 return;
176e21ee
CL		 964 }
965
966 /* Copy the XID from the skb... */
967 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
968 if (xp == NULL)
a2648094 969 return;
176e21ee
CL		 970
971 /* Look up and lock the request corresponding to the given XID */
ce7c252a 972 spin_lock(&xprt->recv_lock);
176e21ee
CL		 973 rovr = xprt_lookup_rqst(xprt, *xp);
974 if (!rovr)
975 goto out_unlock;
729749bb 976 xprt_pin_rqst(rovr);
ce7c252a 977 spin_unlock(&xprt->recv_lock);
176e21ee
CL		 978 task = rovr->rq_task;
979
980 copied = rovr->rq_private_buf.buflen;
981 if (copied > repsize)
982 copied = repsize;
983
984 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
985 dprintk("RPC: sk_buff copy failed\n");
ce7c252a 986 spin_lock(&xprt->recv_lock);
729749bb 987 goto out_unpin;
176e21ee
CL		 988 }
989
ce7c252a 990 spin_lock(&xprt->recv_lock);
176e21ee 991 xprt_complete_rqst(task, copied);
729749bb
TM		 992out_unpin:
993 xprt_unpin_rqst(rovr);
176e21ee 994 out_unlock:
ce7c252a 995 spin_unlock(&xprt->recv_lock);
a2648094
TM		 996}
997
998static void xs_local_data_receive(struct sock_xprt *transport)
999{
1000 struct sk_buff *skb;
1001 struct sock *sk;
1002 int err;
1003
1004 mutex_lock(&transport->recv_mutex);
1005 sk = transport->inet;
1006 if (sk == NULL)
1007 goto out;
1008 for (;;) {
1009 skb = skb_recv_datagram(sk, 0, 1, &err);
42d42a5b
TM		 1010 if (skb != NULL) {
1011 xs_local_data_read_skb(&transport->xprt, sk, skb);
1012 skb_free_datagram(sk, skb);
1013 continue;
1014 }
1015 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
a2648094 1016 break;
a2648094
TM		 1017 }
1018out:
1019 mutex_unlock(&transport->recv_mutex);
1020}
1021
1022static void xs_local_data_receive_workfn(struct work_struct *work)
1023{
1024 struct sock_xprt *transport =
1025 container_of(work, struct sock_xprt, recv_worker);
1026 xs_local_data_receive(transport);
176e21ee
CL		 1027}
1028
9903cd1c 1029/**
f9b2ee71
TM		 1030 * xs_udp_data_read_skb - receive callback for UDP sockets
1031 * @xprt: transport
1032 * @sk: socket
1033 * @skb: skbuff
9903cd1c 1034 *
a246b010 1035 */
f9b2ee71
TM		 1036static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1037 struct sock *sk,
1038 struct sk_buff *skb)
a246b010 1039{
9903cd1c 1040 struct rpc_task *task;
a246b010 1041 struct rpc_rqst *rovr;
f9b2ee71 1042 int repsize, copied;
d8ed029d
AD		 1043 u32 _xid;
1044 __be32 *xp;
a246b010 1045
1da8c681 1046 repsize = skb->len;
a246b010 1047 if (repsize < 4) {
46121cf7 1048 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
f9b2ee71 1049 return;
a246b010
CL		 1050 }
1051
1052 /* Copy the XID from the skb... */
1da8c681 1053 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
a246b010 1054 if (xp == NULL)
f9b2ee71 1055 return;
a246b010
CL		 1056
1057 /* Look up and lock the request corresponding to the given XID */
ce7c252a 1058 spin_lock(&xprt->recv_lock);
a246b010
CL		 1059 rovr = xprt_lookup_rqst(xprt, *xp);
1060 if (!rovr)
1061 goto out_unlock;
729749bb 1062 xprt_pin_rqst(rovr);
ce7c252a 1063 spin_unlock(&xprt->recv_lock);
a246b010
CL		 1064 task = rovr->rq_task;
1065
a246b010
CL		 1066 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1067 copied = repsize;
1068
1069 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5 1070 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
02c22347 1071 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
ce7c252a 1072 spin_lock(&xprt->recv_lock);
729749bb 1073 goto out_unpin;
1781f7f5
HX		 1074 }
1075
02c22347 1076 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
a246b010 1077
729749bb 1078 spin_lock_bh(&xprt->transport_lock);
6a24dfb6 1079 xprt_adjust_cwnd(xprt, task, copied);
ce7c252a
TM		 1080 spin_unlock_bh(&xprt->transport_lock);
1081 spin_lock(&xprt->recv_lock);
1570c1e4 1082 xprt_complete_rqst(task, copied);
729749bb
TM		 1083out_unpin:
1084 xprt_unpin_rqst(rovr);
a246b010 1085 out_unlock:
ce7c252a 1086 spin_unlock(&xprt->recv_lock);
f9b2ee71
TM		 1087}
1088
1089static void xs_udp_data_receive(struct sock_xprt *transport)
1090{
1091 struct sk_buff *skb;
1092 struct sock *sk;
1093 int err;
1094
1095 mutex_lock(&transport->recv_mutex);
1096 sk = transport->inet;
1097 if (sk == NULL)
1098 goto out;
1099 for (;;) {
7c13f97f 1100 skb = skb_recv_udp(sk, 0, 1, &err);
42d42a5b
TM		 1101 if (skb != NULL) {
1102 xs_udp_data_read_skb(&transport->xprt, sk, skb);
850cbadd 1103 consume_skb(skb);
42d42a5b
TM		 1104 continue;
1105 }
1106 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
f9b2ee71 1107 break;
f9b2ee71
TM		 1108 }
1109out:
1110 mutex_unlock(&transport->recv_mutex);
1111}
1112
1113static void xs_udp_data_receive_workfn(struct work_struct *work)
1114{
1115 struct sock_xprt *transport =
1116 container_of(work, struct sock_xprt, recv_worker);
1117 xs_udp_data_receive(transport);
1118}
1119
1120/**
1121 * xs_data_ready - "data ready" callback for UDP sockets
1122 * @sk: socket with data to read
1123 *
1124 */
1125static void xs_data_ready(struct sock *sk)
1126{
1127 struct rpc_xprt *xprt;
1128
1129 read_lock_bh(&sk->sk_callback_lock);
1130 dprintk("RPC: xs_data_ready...\n");
1131 xprt = xprt_from_sock(sk);
1132 if (xprt != NULL) {
1133 struct sock_xprt *transport = container_of(xprt,
1134 struct sock_xprt, xprt);
5157b956
TM		 1135 transport->old_data_ready(sk);
1136 /* Any data means we had a useful conversation, so
1137 * then we don't need to delay the next reconnect
1138 */
1139 if (xprt->reestablish_timeout)
1140 xprt->reestablish_timeout = 0;
42d42a5b 1141 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
40a5f1b1 1142 queue_work(xprtiod_workqueue, &transport->recv_worker);
f9b2ee71 1143 }
f064af1e 1144 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1145}
1146
a519fc7a
TM		 1147/*
1148 * Helper function to force a TCP close if the server is sending
1149 * junk and/or it has put us in CLOSE_WAIT
1150 */
1151static void xs_tcp_force_close(struct rpc_xprt *xprt)
1152{
a519fc7a
TM		 1153 xprt_force_disconnect(xprt);
1154}
1155
dd456471 1156static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1157{
51971139 1158 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1159 size_t len, used;
1160 char *p;
1161
51971139
CL		 1162 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1163 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1164 used = xdr_skb_read_bits(desc, p, len);
51971139 1165 transport->tcp_offset += used;
a246b010
CL		 1166 if (used != len)
1167 return;
808012fb 1168
51971139
CL		 1169 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1170 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1171 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1172 else
e136d092 1173 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1174 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1175
e136d092 1176 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1177 transport->tcp_offset = 0;
808012fb 1178
a246b010 1179 /* Sanity check of the record length */
18dca02a 1180 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1181 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1182 xs_tcp_force_close(xprt);
9903cd1c 1183 return;
a246b010 1184 }
46121cf7 1185 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1186 transport->tcp_reclen);
a246b010
CL		 1187}
1188
51971139 1189static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1190{
51971139 1191 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1192 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1193 transport->tcp_offset = 0;
e136d092
CL		 1194 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1195 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1196 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1197 transport->tcp_copied = 0;
a246b010
CL		 1198 }
1199 }
1200}
1201
dd456471 1202static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1203{
1204 size_t len, used;
1205 char *p;
1206
51971139 1207 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
5b5e0928 1208 dprintk("RPC: reading XID (%zu bytes)\n", len);
51971139 1209 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1210 used = xdr_skb_read_bits(desc, p, len);
51971139 1211 transport->tcp_offset += used;
a246b010
CL		 1212 if (used != len)
1213 return;
e136d092 1214 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1215 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1216 transport->tcp_copied = 4;
18dca02a
RL		 1217 dprintk("RPC: reading %s XID %08x\n",
1218 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1219 : "request with",
51971139
CL		 1220 ntohl(transport->tcp_xid));
1221 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1222}
1223
18dca02a
RL		 1224static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1225 struct xdr_skb_reader *desc)
a246b010 1226{
18dca02a
RL		 1227 size_t len, used;
1228 u32 offset;
b76ce561 1229 char *p;
18dca02a
RL		 1230
1231 /*
1232 * We want transport->tcp_offset to be 8 at the end of this routine
1233 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1234 * When this function is called for the first time,
1235 * transport->tcp_offset is 4 (after having already read the xid).
1236 */
1237 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1238 len = sizeof(transport->tcp_calldir) - offset;
5b5e0928 1239 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
b76ce561
TM		 1240 p = ((char *) &transport->tcp_calldir) + offset;
1241 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1242 transport->tcp_offset += used;
1243 if (used != len)
1244 return;
f4a2e418 1245 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1246 /*
1247 * We don't yet have the XDR buffer, so we will write the calldir
1248 * out after we get the buffer from the 'struct rpc_rqst'
1249 */
b76ce561
TM		 1250 switch (ntohl(transport->tcp_calldir)) {
1251 case RPC_REPLY:
1252 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1253 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1254 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1255 break;
1256 case RPC_CALL:
1257 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1258 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1259 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1260 break;
1261 default:
1262 dprintk("RPC: invalid request message type\n");
a519fc7a 1263 xs_tcp_force_close(&transport->xprt);
b76ce561 1264 }
18dca02a
RL		 1265 xs_tcp_check_fraghdr(transport);
1266}
1267
44b98efd
RL		 1268static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1269 struct xdr_skb_reader *desc,
1270 struct rpc_rqst *req)
a246b010 1271{
44b98efd
RL		 1272 struct sock_xprt *transport =
1273 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1274 struct xdr_buf *rcvbuf;
1275 size_t len;
1276 ssize_t r;
1277
a246b010 1278 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1279
1280 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1281 /*
1282 * Save the RPC direction in the XDR buffer
1283 */
f4a2e418 1284 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1285 &transport->tcp_calldir,
1286 sizeof(transport->tcp_calldir));
1287 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1288 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1289 }
1290
a246b010 1291 len = desc->count;
040249df
TM		 1292 if (len > transport->tcp_reclen - transport->tcp_offset)
1293 desc->count = transport->tcp_reclen - transport->tcp_offset;
1294 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1295 desc, xdr_skb_read_bits);
a246b010 1296
040249df 1297 if (desc->count) {
a246b010
CL		 1298 /* Error when copying to the receive buffer,
1299 * usually because we weren't able to allocate
1300 * additional buffer pages. All we can do now
e136d092 1301 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1302 * will not receive any additional updates,
1303 * and time out.
1304 * Any remaining data from this record will
1305 * be discarded.
1306 */
e136d092 1307 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1308 dprintk("RPC: XID %08x truncated request\n",
51971139 1309 ntohl(transport->tcp_xid));
46121cf7
CL		 1310 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1311 "tcp_offset = %u, tcp_reclen = %u\n",
1312 xprt, transport->tcp_copied,
1313 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1314 return;
a246b010
CL		 1315 }
1316
040249df
TM		 1317 transport->tcp_copied += r;
1318 transport->tcp_offset += r;
1319 desc->count = len - r;
1320
5b5e0928 1321 dprintk("RPC: XID %08x read %zd bytes\n",
51971139 1322 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1323 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1324 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1325 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1326
1327 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1328 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1329 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1330 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1331 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1332 }
44b98efd
RL		 1333}
1334
1335/*
1336 * Finds the request corresponding to the RPC xid and invokes the common
1337 * tcp read code to read the data.
1338 */
1339static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1340 struct xdr_skb_reader *desc)
1341{
1342 struct sock_xprt *transport =
1343 container_of(xprt, struct sock_xprt, xprt);
1344 struct rpc_rqst *req;
1345
1346 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1347
1348 /* Find and lock the request corresponding to this xid */
ce7c252a 1349 spin_lock(&xprt->recv_lock);
44b98efd
RL		 1350 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1351 if (!req) {
1352 dprintk("RPC: XID %08x request not found!\n",
1353 ntohl(transport->tcp_xid));
ce7c252a 1354 spin_unlock(&xprt->recv_lock);
44b98efd
RL		 1355 return -1;
1356 }
729749bb 1357 xprt_pin_rqst(req);
ce7c252a 1358 spin_unlock(&xprt->recv_lock);
44b98efd
RL		 1359
1360 xs_tcp_read_common(xprt, desc, req);
1361
ce7c252a 1362 spin_lock(&xprt->recv_lock);
e136d092 1363 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1364 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
729749bb 1365 xprt_unpin_rqst(req);
ce7c252a 1366 spin_unlock(&xprt->recv_lock);
44b98efd
RL		 1367 return 0;
1368}
1369
9e00abc3 1370#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1371/*
1372 * Obtains an rpc_rqst previously allocated and invokes the common
1373 * tcp read code to read the data. The result is placed in the callback
1374 * queue.
1375 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1376 * connection and return -1.
1377 */
2ea24497 1378static int xs_tcp_read_callback(struct rpc_xprt *xprt,
44b98efd
RL		 1379 struct xdr_skb_reader *desc)
1380{
1381 struct sock_xprt *transport =
1382 container_of(xprt, struct sock_xprt, xprt);
1383 struct rpc_rqst *req;
1384
c89091c8 1385 /* Look up the request corresponding to the given XID */
2ea24497 1386 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
44b98efd
RL		 1387 if (req == NULL) {
1388 printk(KERN_WARNING "Callback slot table overflowed\n");
1389 xprt_force_disconnect(xprt);
1390 return -1;
1391 }
1392
44b98efd
RL		 1393 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1394 xs_tcp_read_common(xprt, desc, req);
1395
2ea24497
TM		 1396 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1397 xprt_complete_bc_request(req, transport->tcp_copied);
44b98efd
RL		 1398
1399 return 0;
1400}
1401
1402static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1403 struct xdr_skb_reader *desc)
1404{
1405 struct sock_xprt *transport =
1406 container_of(xprt, struct sock_xprt, xprt);
1407
1408 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1409 xs_tcp_read_reply(xprt, desc) :
1410 xs_tcp_read_callback(xprt, desc);
1411}
76566773
CL		 1412
1413static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1414{
1415 int ret;
1416
1417 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1418 SVC_SOCK_ANONYMOUS);
1419 if (ret < 0)
1420 return ret;
1421 return 0;
1422}
6b26cc8c
CL		 1423
1424static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1425{
1426 return PAGE_SIZE;
1427}
44b98efd
RL		 1428#else
1429static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1430 struct xdr_skb_reader *desc)
1431{
1432 return xs_tcp_read_reply(xprt, desc);
1433}
9e00abc3 1434#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1435
1436/*
1437 * Read data off the transport. This can be either an RPC_CALL or an
1438 * RPC_REPLY. Relay the processing to helper functions.
1439 */
1440static void xs_tcp_read_data(struct rpc_xprt *xprt,
1441 struct xdr_skb_reader *desc)
1442{
1443 struct sock_xprt *transport =
1444 container_of(xprt, struct sock_xprt, xprt);
1445
1446 if (_xs_tcp_read_data(xprt, desc) == 0)
1447 xs_tcp_check_fraghdr(transport);
1448 else {
1449 /*
1450 * The transport_lock protects the request handling.
1451 * There's no need to hold it to update the tcp_flags.
1452 */
1453 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1454 }
a246b010
CL		 1455}
1456
dd456471 1457static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1458{
1459 size_t len;
1460
51971139 1461 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1462 if (len > desc->count)
1463 len = desc->count;
1464 desc->count -= len;
1465 desc->offset += len;
51971139 1466 transport->tcp_offset += len;
5b5e0928 1467 dprintk("RPC: discarded %zu bytes\n", len);
51971139 1468 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1469}
1470
9903cd1c 1471static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1472{
1473 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1474 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1475 struct xdr_skb_reader desc = {
a246b010
CL		 1476 .skb = skb,
1477 .offset = offset,
1478 .count = len,
9903cd1c 1479 };
a246b010 1480
46121cf7 1481 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010 1482 do {
1a867a08 1483 trace_xs_tcp_data_recv(transport);
a246b010
CL		 1484 /* Read in a new fragment marker if necessary */
1485 /* Can we ever really expect to get completely empty fragments? */
e136d092 1486 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1487 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1488 continue;
1489 }
1490 /* Read in the xid if necessary */
e136d092 1491 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1492 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1493 continue;
1494 }
18dca02a 1495 /* Read in the call/reply flag */
f4a2e418 1496 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1497 xs_tcp_read_calldir(transport, &desc);
1498 continue;
1499 }
a246b010 1500 /* Read in the request data */
e136d092 1501 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1502 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1503 continue;
1504 }
1505 /* Skip over any trailing bytes on short reads */
51971139 1506 xs_tcp_read_discard(transport, &desc);
a246b010 1507 } while (desc.count);
1a867a08 1508 trace_xs_tcp_data_recv(transport);
46121cf7 1509 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1510 return len - desc.count;
1511}
1512
66d7a56a
TM		 1513static void xs_tcp_data_receive(struct sock_xprt *transport)
1514{
1515 struct rpc_xprt *xprt = &transport->xprt;
1516 struct sock *sk;
1517 read_descriptor_t rd_desc = {
1518 .count = 2*1024*1024,
1519 .arg.data = xprt,
1520 };
1521 unsigned long total = 0;
8d6f97d6 1522 int loop;
66d7a56a
TM		 1523 int read = 0;
1524
edc1b01c 1525 mutex_lock(&transport->recv_mutex);
66d7a56a 1526 sk = transport->inet;
edc1b01c
TM		 1527 if (sk == NULL)
1528 goto out;
66d7a56a
TM		 1529
1530 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
8d6f97d6 1531 for (loop = 0; loop < 64; loop++) {
edc1b01c 1532 lock_sock(sk);
66d7a56a 1533 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
42d42a5b
TM		 1534 if (read <= 0) {
1535 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1536 release_sock(sk);
8d6f97d6 1537 break;
42d42a5b 1538 }
8d6f97d6
TM		 1539 release_sock(sk);
1540 total += read;
66d7a56a
TM		 1541 rd_desc.count = 65536;
1542 }
8d6f97d6
TM		 1543 if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1544 queue_work(xprtiod_workqueue, &transport->recv_worker);
edc1b01c
TM		 1545out:
1546 mutex_unlock(&transport->recv_mutex);
66d7a56a
TM		 1547 trace_xs_tcp_data_ready(xprt, read, total);
1548}
1549
edc1b01c
TM		 1550static void xs_tcp_data_receive_workfn(struct work_struct *work)
1551{
1552 struct sock_xprt *transport =
1553 container_of(work, struct sock_xprt, recv_worker);
1554 xs_tcp_data_receive(transport);
1555}
1556
9903cd1c
CL		 1557/**
1558 * xs_tcp_state_change - callback to handle TCP socket state changes
1559 * @sk: socket whose state has changed
1560 *
1561 */
1562static void xs_tcp_state_change(struct sock *sk)
a246b010 1563{
9903cd1c 1564 struct rpc_xprt *xprt;
0fdea1e8 1565 struct sock_xprt *transport;
a246b010 1566
f064af1e 1567 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1568 if (!(xprt = xprt_from_sock(sk)))
1569 goto out;
46121cf7 1570 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1571 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1572 sk->sk_state, xprt_connected(xprt),
1573 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1574 sock_flag(sk, SOCK_ZAPPED),
1575 sk->sk_shutdown);
a246b010 1576
0fdea1e8 1577 transport = container_of(xprt, struct sock_xprt, xprt);
40b5ea0c 1578 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1579 switch (sk->sk_state) {
1580 case TCP_ESTABLISHED:
f064af1e 1581 spin_lock(&xprt->transport_lock);
a246b010 1582 if (!xprt_test_and_set_connected(xprt)) {
51971139 1583
a246b010 1584 /* Reset TCP record info */
51971139
CL		 1585 transport->tcp_offset = 0;
1586 transport->tcp_reclen = 0;
1587 transport->tcp_copied = 0;
e136d092
CL		 1588 transport->tcp_flags =
1589 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
8b71798c 1590 xprt->connect_cookie++;
0fdea1e8
TM		 1591 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1592 xprt_clear_connecting(xprt);
51971139 1593
2a491991 1594 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1595 }
f064af1e 1596 spin_unlock(&xprt->transport_lock);
a246b010 1597 break;
3b948ae5
TM		 1598 case TCP_FIN_WAIT1:
1599 /* The client initiated a shutdown of the socket */
7c1d71cf 1600 xprt->connect_cookie++;
663b8858 1601 xprt->reestablish_timeout = 0;
3b948ae5 1602 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1603 smp_mb__before_atomic();
3b948ae5 1604 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1605 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
4e857c58 1606 smp_mb__after_atomic();
a246b010 1607 break;
632e3bdc 1608 case TCP_CLOSE_WAIT:
3b948ae5 1609 /* The server initiated a shutdown of the socket */
7c1d71cf 1610 xprt->connect_cookie++;
d0bea455 1611 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1612 xs_tcp_force_close(xprt);
663b8858
TM		 1613 case TCP_CLOSING:
1614 /*
1615 * If the server closed down the connection, make sure that
1616 * we back off before reconnecting
1617 */
1618 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1619 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1620 break;
1621 case TCP_LAST_ACK:
670f9457 1622 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1623 smp_mb__before_atomic();
3b948ae5 1624 clear_bit(XPRT_CONNECTED, &xprt->state);
4e857c58 1625 smp_mb__after_atomic();
3b948ae5
TM		 1626 break;
1627 case TCP_CLOSE:
0fdea1e8
TM		 1628 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1629 &transport->sock_state))
1630 xprt_clear_connecting(xprt);
3ffbc1d6
N		 1631 if (sk->sk_err)
1632 xprt_wake_pending_tasks(xprt, -sk->sk_err);
7d1e8255 1633 xs_sock_mark_closed(xprt);
a246b010
CL		 1634 }
1635 out:
f064af1e 1636 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1637}
1638
1f0fa154
IJ		 1639static void xs_write_space(struct sock *sk)
1640{
13331a55 1641 struct socket_wq *wq;
1f0fa154
IJ		 1642 struct rpc_xprt *xprt;
1643
13331a55 1644 if (!sk->sk_socket)
1f0fa154 1645 return;
13331a55 1646 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1f0fa154
IJ		 1647
1648 if (unlikely(!(xprt = xprt_from_sock(sk))))
1649 return;
13331a55
TM		 1650 rcu_read_lock();
1651 wq = rcu_dereference(sk->sk_wq);
1652 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1653 goto out;
1f0fa154
IJ		 1654
1655 xprt_write_space(xprt);
13331a55
TM		 1656out:
1657 rcu_read_unlock();
1f0fa154
IJ		 1658}
1659
9903cd1c 1660/**
c7b2cae8
CL		 1661 * xs_udp_write_space - callback invoked when socket buffer space
1662 * becomes available
9903cd1c
CL		 1663 * @sk: socket whose state has changed
1664 *
a246b010
CL		 1665 * Called when more output buffer space is available for this socket.
1666 * We try not to wake our writers until they can make "significant"
c7b2cae8 1667 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1668 * with a bunch of small requests.
1669 */
c7b2cae8 1670static void xs_udp_write_space(struct sock *sk)
a246b010 1671{
f064af1e 1672 read_lock_bh(&sk->sk_callback_lock);
a246b010 1673
c7b2cae8 1674 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1675 if (sock_writeable(sk))
1676 xs_write_space(sk);
a246b010 1677
f064af1e 1678 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1679}
a246b010 1680
c7b2cae8
CL		 1681/**
1682 * xs_tcp_write_space - callback invoked when socket buffer space
1683 * becomes available
1684 * @sk: socket whose state has changed
1685 *
1686 * Called when more output buffer space is available for this socket.
1687 * We try not to wake our writers until they can make "significant"
1688 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1689 * with a bunch of small requests.
1690 */
1691static void xs_tcp_write_space(struct sock *sk)
1692{
f064af1e 1693 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1694
1695 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1696 if (sk_stream_is_writeable(sk))
1f0fa154 1697 xs_write_space(sk);
b6ddf64f 1698
f064af1e 1699 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1700}
1701
470056c2 1702static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1703{
ee0ac0c2
CL		 1704 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1705 struct sock *sk = transport->inet;
a246b010 1706
7c6e066e 1707 if (transport->rcvsize) {
a246b010 1708 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1709 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1710 }
7c6e066e 1711 if (transport->sndsize) {
a246b010 1712 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1713 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1714 sk->sk_write_space(sk);
1715 }
1716}
1717
43118c29 1718/**
470056c2 1719 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1720 * @xprt: generic transport
470056c2
CL		 1721 * @sndsize: requested size of send buffer, in bytes
1722 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1723 *
470056c2 1724 * Set socket send and receive buffer size limits.
43118c29 1725 */
470056c2 1726static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1727{
7c6e066e
CL		 1728 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1729
1730 transport->sndsize = 0;
470056c2 1731 if (sndsize)
7c6e066e
CL		 1732 transport->sndsize = sndsize + 1024;
1733 transport->rcvsize = 0;
470056c2 1734 if (rcvsize)
7c6e066e 1735 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1736
1737 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1738}
1739
46c0ee8b
CL		 1740/**
1741 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1742 * @task: task that timed out
1743 *
1744 * Adjust the congestion window after a retransmit timeout has occurred.
1745 */
6a24dfb6 1746static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1747{
b977b644 1748 spin_lock_bh(&xprt->transport_lock);
6a24dfb6 1749 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
b977b644 1750 spin_unlock_bh(&xprt->transport_lock);
46c0ee8b
CL		 1751}
1752
b85d8806
CL		 1753static unsigned short xs_get_random_port(void)
1754{
5d71899a 1755 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
63862b5b 1756 unsigned short rand = (unsigned short) prandom_u32() % range;
b85d8806
CL		 1757 return rand + xprt_min_resvport;
1758}
1759
4dda9c8a
TM		 1760/**
1761 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1762 * @sock: socket
1763 *
1764 * Note that this function has to be called on all sockets that share the
1765 * same port, and it must be called before binding.
1766 */
1767static void xs_sock_set_reuseport(struct socket *sock)
1768{
402e23b4 1769 int opt = 1;
4dda9c8a 1770
402e23b4
TM		 1771 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1772 (char *)&opt, sizeof(opt));
4dda9c8a
TM		 1773}
1774
1775static unsigned short xs_sock_getport(struct socket *sock)
1776{
1777 struct sockaddr_storage buf;
1778 int buflen;
1779 unsigned short port = 0;
1780
1781 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1782 goto out;
1783 switch (buf.ss_family) {
1784 case AF_INET6:
1785 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1786 break;
1787 case AF_INET:
1788 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1789 }
1790out:
1791 return port;
1792}
1793
92200412
CL		 1794/**
1795 * xs_set_port - reset the port number in the remote endpoint address
1796 * @xprt: generic transport
1797 * @port: new port number
1798 *
1799 */
1800static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1801{
46121cf7 1802 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1803
9dc3b095
CL		 1804 rpc_set_port(xs_addr(xprt), port);
1805 xs_update_peer_port(xprt);
92200412
CL		 1806}
1807
4dda9c8a
TM		 1808static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1809{
1810 if (transport->srcport == 0)
1811 transport->srcport = xs_sock_getport(sock);
1812}
1813
5d4ec932 1814static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1815{
fbfffbd5 1816 unsigned short port = transport->srcport;
67a391d7
TM		 1817
1818 if (port == 0 && transport->xprt.resvport)
1819 port = xs_get_random_port();
1820 return port;
1821}
1822
baaf4e48 1823static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1824{
fbfffbd5
CL		 1825 if (transport->srcport != 0)
1826 transport->srcport = 0;
67a391d7
TM		 1827 if (!transport->xprt.resvport)
1828 return 0;
1829 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1830 return xprt_max_resvport;
1831 return --port;
1832}
beb59b68 1833static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1834{
beb59b68 1835 struct sockaddr_storage myaddr;
67a391d7 1836 int err, nloop = 0;
5d4ec932 1837 unsigned short port = xs_get_srcport(transport);
67a391d7 1838 unsigned short last;
a246b010 1839
0f7a622c
CP		 1840 /*
1841 * If we are asking for any ephemeral port (i.e. port == 0 &&
1842 * transport->xprt.resvport == 0), don't bind. Let the local
1843 * port selection happen implicitly when the socket is used
1844 * (for example at connect time).
1845 *
1846 * This ensures that we can continue to establish TCP
1847 * connections even when all local ephemeral ports are already
1848 * a part of some TCP connection. This makes no difference
1849 * for UDP sockets, but also doens't harm them.
1850 *
1851 * If we're asking for any reserved port (i.e. port == 0 &&
1852 * transport->xprt.resvport == 1) xs_get_srcport above will
1853 * ensure that port is non-zero and we will bind as needed.
1854 */
1855 if (port == 0)
1856 return 0;
1857
beb59b68 1858 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1859 do {
beb59b68
PE		 1860 rpc_set_port((struct sockaddr *)&myaddr, port);
1861 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1862 transport->xprt.addrlen);
a246b010 1863 if (err == 0) {
fbfffbd5 1864 transport->srcport = port;
d3bc9a1d 1865 break;
a246b010 1866 }
67a391d7 1867 last = port;
baaf4e48 1868 port = xs_next_srcport(transport, port);
67a391d7
TM		 1869 if (port > last)
1870 nloop++;
1871 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1872
4232e863 1873 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1874 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1875 &((struct sockaddr_in *)&myaddr)->sin_addr,
1876 port, err ? "failed" : "ok", err);
1877 else
1878 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1879 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1880 port, err ? "failed" : "ok", err);
a246b010
CL		 1881 return err;
1882}
1883
176e21ee
CL		 1884/*
1885 * We don't support autobind on AF_LOCAL sockets
1886 */
1887static void xs_local_rpcbind(struct rpc_task *task)
1888{
fb43d172 1889 xprt_set_bound(task->tk_xprt);
176e21ee
CL		 1890}
1891
1892static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1893{
1894}
beb59b68 1895
ed07536e
PZ		 1896#ifdef CONFIG_DEBUG_LOCK_ALLOC
1897static struct lock_class_key xs_key[2];
1898static struct lock_class_key xs_slock_key[2];
1899
176e21ee
CL		 1900static inline void xs_reclassify_socketu(struct socket *sock)
1901{
1902 struct sock *sk = sock->sk;
1903
176e21ee
CL		 1904 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1905 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1906}
1907
8945ee5e 1908static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1909{
1910 struct sock *sk = sock->sk;
8945ee5e 1911
8945ee5e
CL		 1912 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1913 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1914}
ed07536e 1915
8945ee5e
CL		 1916static inline void xs_reclassify_socket6(struct socket *sock)
1917{
1918 struct sock *sk = sock->sk;
ed07536e 1919
8945ee5e
CL		 1920 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1921 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1922}
6bc9638a
PE		 1923
1924static inline void xs_reclassify_socket(int family, struct socket *sock)
1925{
fafc4e1e 1926 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1b7a1819
WAA		 1927 return;
1928
4232e863 1929 switch (family) {
176e21ee
CL		 1930 case AF_LOCAL:
1931 xs_reclassify_socketu(sock);
1932 break;
4232e863 1933 case AF_INET:
6bc9638a 1934 xs_reclassify_socket4(sock);
4232e863
CL		 1935 break;
1936 case AF_INET6:
6bc9638a 1937 xs_reclassify_socket6(sock);
4232e863
CL		 1938 break;
1939 }
6bc9638a 1940}
ed07536e 1941#else
6bc9638a
PE		 1942static inline void xs_reclassify_socket(int family, struct socket *sock)
1943{
1944}
ed07536e
PZ		 1945#endif
1946
93dc41bd
N		 1947static void xs_dummy_setup_socket(struct work_struct *work)
1948{
1949}
1950
6bc9638a 1951static struct socket *xs_create_sock(struct rpc_xprt *xprt,
4dda9c8a
TM		 1952 struct sock_xprt *transport, int family, int type,
1953 int protocol, bool reuseport)
22f79326
PE		 1954{
1955 struct socket *sock;
1956 int err;
1957
6bc9638a 1958 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1959 if (err < 0) {
1960 dprintk("RPC: can't create %d transport socket (%d).\n",
1961 protocol, -err);
1962 goto out;
1963 }
6bc9638a 1964 xs_reclassify_socket(family, sock);
22f79326 1965
4dda9c8a
TM		 1966 if (reuseport)
1967 xs_sock_set_reuseport(sock);
1968
4cea288a
BH		 1969 err = xs_bind(transport, sock);
1970 if (err) {
22f79326
PE		 1971 sock_release(sock);
1972 goto out;
1973 }
1974
1975 return sock;
1976out:
1977 return ERR_PTR(err);
1978}
1979
176e21ee
CL		 1980static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1981 struct socket *sock)
1982{
1983 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1984 xprt);
1985
1986 if (!transport->inet) {
1987 struct sock *sk = sock->sk;
1988
1989 write_lock_bh(&sk->sk_callback_lock);
1990
1991 xs_save_old_callbacks(transport, sk);
1992
1993 sk->sk_user_data = xprt;
a2648094 1994 sk->sk_data_ready = xs_data_ready;
176e21ee 1995 sk->sk_write_space = xs_udp_write_space;
b4411457 1996 sock_set_flag(sk, SOCK_FASYNC);
2118071d 1997 sk->sk_error_report = xs_error_report;
c2126157 1998 sk->sk_allocation = GFP_NOIO;
176e21ee
CL		 1999
2000 xprt_clear_connected(xprt);
2001
2002 /* Reset to new socket */
2003 transport->sock = sock;
2004 transport->inet = sk;
2005
2006 write_unlock_bh(&sk->sk_callback_lock);
2007 }
2008
2009 /* Tell the socket layer to start connecting... */
2010 xprt->stat.connect_count++;
2011 xprt->stat.connect_start = jiffies;
2012 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
2013}
2014
2015/**
2016 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
176e21ee 2017 * @transport: socket transport to connect
176e21ee 2018 */
dc107402 2019static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 2020{
176e21ee
CL		 2021 struct rpc_xprt *xprt = &transport->xprt;
2022 struct socket *sock;
2023 int status = -EIO;
2024
176e21ee
CL		 2025 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2026 SOCK_STREAM, 0, &sock, 1);
2027 if (status < 0) {
2028 dprintk("RPC: can't create AF_LOCAL "
2029 "transport socket (%d).\n", -status);
2030 goto out;
2031 }
d1358917 2032 xs_reclassify_socket(AF_LOCAL, sock);
176e21ee
CL		 2033
2034 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2035 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2036
2037 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 2038 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 2039 switch (status) {
2040 case 0:
2041 dprintk("RPC: xprt %p connected to %s\n",
2042 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2043 xprt_set_connected(xprt);
3601c4a9 2044 case -ENOBUFS:
176e21ee
CL		 2045 break;
2046 case -ENOENT:
2047 dprintk("RPC: xprt %p: socket %s does not exist\n",
2048 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2049 break;
4a20a988
TM		 2050 case -ECONNREFUSED:
2051 dprintk("RPC: xprt %p: connection refused for %s\n",
2052 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2053 break;
176e21ee
CL		 2054 default:
2055 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2056 __func__, -status,
2057 xprt->address_strings[RPC_DISPLAY_ADDR]);
2058 }
2059
2060out:
2061 xprt_clear_connecting(xprt);
2062 xprt_wake_pending_tasks(xprt, status);
dc107402
BF		 2063 return status;
2064}
2065
b6669737 2066static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 2067{
dc107402
BF		 2068 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2069 int ret;
2070
2071 if (RPC_IS_ASYNC(task)) {
2072 /*
2073 * We want the AF_LOCAL connect to be resolved in the
2074 * filesystem namespace of the process making the rpc
2075 * call. Thus we connect synchronously.
2076 *
2077 * If we want to support asynchronous AF_LOCAL calls,
2078 * we'll need to figure out how to pass a namespace to
2079 * connect.
2080 */
2081 rpc_exit(task, -ENOTCONN);
2082 return;
2083 }
2084 ret = xs_local_setup_socket(transport);
2085 if (ret && !RPC_IS_SOFTCONN(task))
2086 msleep_interruptible(15000);
176e21ee
CL		 2087}
2088
3c87ef6e 2089#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
d6e971d8
JL		 2090/*
2091 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2092 * know that we have exclusive access to the socket), to guard against
2093 * races with xs_reset_transport.
2094 */
a564b8f0
MG		 2095static void xs_set_memalloc(struct rpc_xprt *xprt)
2096{
2097 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2098 xprt);
2099
d6e971d8
JL		 2100 /*
2101 * If there's no sock, then we have nothing to set. The
2102 * reconnecting process will get it for us.
2103 */
2104 if (!transport->inet)
2105 return;
8e228133 2106 if (atomic_read(&xprt->swapper))
a564b8f0
MG		 2107 sk_set_memalloc(transport->inet);
2108}
2109
2110/**
d67fa4d8 2111 * xs_enable_swap - Tag this transport as being used for swap.
a564b8f0 2112 * @xprt: transport to tag
a564b8f0 2113 *
8e228133
JL		 2114 * Take a reference to this transport on behalf of the rpc_clnt, and
2115 * optionally mark it for swapping if it wasn't already.
a564b8f0 2116 */
d67fa4d8
JL		 2117static int
2118xs_enable_swap(struct rpc_xprt *xprt)
a564b8f0 2119{
d6e971d8 2120 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
a564b8f0 2121
d6e971d8
JL		 2122 if (atomic_inc_return(&xprt->swapper) != 1)
2123 return 0;
2124 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2125 return -ERESTARTSYS;
2126 if (xs->inet)
2127 sk_set_memalloc(xs->inet);
2128 xprt_release_xprt(xprt, NULL);
8e228133
JL		 2129 return 0;
2130}
a564b8f0 2131
8e228133 2132/**
d67fa4d8 2133 * xs_disable_swap - Untag this transport as being used for swap.
8e228133
JL		 2134 * @xprt: transport to tag
2135 *
2136 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2137 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2138 */
d67fa4d8
JL		 2139static void
2140xs_disable_swap(struct rpc_xprt *xprt)
8e228133 2141{
d6e971d8 2142 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
8e228133 2143
d6e971d8
JL		 2144 if (!atomic_dec_and_test(&xprt->swapper))
2145 return;
2146 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2147 return;
2148 if (xs->inet)
2149 sk_clear_memalloc(xs->inet);
2150 xprt_release_xprt(xprt, NULL);
a564b8f0 2151}
a564b8f0
MG		 2152#else
2153static void xs_set_memalloc(struct rpc_xprt *xprt)
2154{
2155}
d67fa4d8
JL		 2156
2157static int
2158xs_enable_swap(struct rpc_xprt *xprt)
2159{
2160 return -EINVAL;
2161}
2162
2163static void
2164xs_disable_swap(struct rpc_xprt *xprt)
2165{
2166}
a564b8f0
MG		 2167#endif
2168
16be2d20
CL		 2169static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2170{
2171 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2172
2173 if (!transport->inet) {
2174 struct sock *sk = sock->sk;
2175
2176 write_lock_bh(&sk->sk_callback_lock);
2177
2a9e1cfa
TM		 2178 xs_save_old_callbacks(transport, sk);
2179
16be2d20 2180 sk->sk_user_data = xprt;
f9b2ee71 2181 sk->sk_data_ready = xs_data_ready;
16be2d20 2182 sk->sk_write_space = xs_udp_write_space;
b4411457 2183 sock_set_flag(sk, SOCK_FASYNC);
c2126157 2184 sk->sk_allocation = GFP_NOIO;
16be2d20
CL		 2185
2186 xprt_set_connected(xprt);
2187
2188 /* Reset to new socket */
2189 transport->sock = sock;
2190 transport->inet = sk;
2191
a564b8f0
MG		 2192 xs_set_memalloc(xprt);
2193
16be2d20
CL		 2194 write_unlock_bh(&sk->sk_callback_lock);
2195 }
2196 xs_udp_do_set_buffer_size(xprt);
02910177
TM		 2197
2198 xprt->stat.connect_start = jiffies;
16be2d20
CL		 2199}
2200
8c14ff2a 2201static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2202{
34161db6
TM		 2203 struct sock_xprt *transport =
2204 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2205 struct rpc_xprt *xprt = &transport->xprt;
d099b8af 2206 struct socket *sock;
b65c0310 2207 int status = -EIO;
9903cd1c 2208
8c14ff2a 2209 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2210 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2211 IPPROTO_UDP, false);
b65c0310 2212 if (IS_ERR(sock))
b0d93ad5 2213 goto out;
68e220bd 2214
c740eff8
CL		 2215 dprintk("RPC: worker connecting xprt %p via %s to "
2216 "%s (port %s)\n", xprt,
2217 xprt->address_strings[RPC_DISPLAY_PROTO],
2218 xprt->address_strings[RPC_DISPLAY_ADDR],
2219 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2220
2221 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2222 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2223 status = 0;
2224out:
718ba5b8 2225 xprt_unlock_connect(xprt, transport);
b0d93ad5 2226 xprt_clear_connecting(xprt);
7d1e8255 2227 xprt_wake_pending_tasks(xprt, status);
a246b010
CL		 2228}
2229
4876cc77
TM		 2230/**
2231 * xs_tcp_shutdown - gracefully shut down a TCP socket
2232 * @xprt: transport
2233 *
2234 * Initiates a graceful shutdown of the TCP socket by calling the
2235 * equivalent of shutdown(SHUT_RDWR);
2236 */
2237static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2238{
2239 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2240 struct socket *sock = transport->sock;
2241
2242 if (sock == NULL)
2243 return;
2244 if (xprt_connected(xprt)) {
2245 kernel_sock_shutdown(sock, SHUT_RDWR);
2246 trace_rpc_socket_shutdown(xprt, sock);
2247 } else
2248 xs_reset_transport(transport);
2249}
2250
8d1b8c62
TM		 2251static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2252 struct socket *sock)
2253{
7196dbb0
TM		 2254 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2255 unsigned int keepidle;
2256 unsigned int keepcnt;
8d1b8c62
TM		 2257 unsigned int opt_on = 1;
2258 unsigned int timeo;
2259
7196dbb0
TM		 2260 spin_lock_bh(&xprt->transport_lock);
2261 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2262 keepcnt = xprt->timeout->to_retries + 1;
2263 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2264 (xprt->timeout->to_retries + 1);
2265 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2266 spin_unlock_bh(&xprt->transport_lock);
2267
8d1b8c62
TM		 2268 /* TCP Keepalive options */
2269 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2270 (char *)&opt_on, sizeof(opt_on));
2271 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2272 (char *)&keepidle, sizeof(keepidle));
2273 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2274 (char *)&keepidle, sizeof(keepidle));
2275 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2276 (char *)&keepcnt, sizeof(keepcnt));
2277
2278 /* TCP user timeout (see RFC5482) */
8d1b8c62
TM		 2279 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2280 (char *)&timeo, sizeof(timeo));
2281}
2282
7196dbb0
TM		 2283static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2284 unsigned long connect_timeout,
2285 unsigned long reconnect_timeout)
2286{
2287 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2288 struct rpc_timeout to;
2289 unsigned long initval;
2290
2291 spin_lock_bh(&xprt->transport_lock);
2292 if (reconnect_timeout < xprt->max_reconnect_timeout)
2293 xprt->max_reconnect_timeout = reconnect_timeout;
2294 if (connect_timeout < xprt->connect_timeout) {
2295 memcpy(&to, xprt->timeout, sizeof(to));
2296 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2297 /* Arbitrary lower limit */
2298 if (initval < XS_TCP_INIT_REEST_TO << 1)
2299 initval = XS_TCP_INIT_REEST_TO << 1;
2300 to.to_initval = initval;
2301 to.to_maxval = initval;
2302 memcpy(&transport->tcp_timeout, &to,
2303 sizeof(transport->tcp_timeout));
2304 xprt->timeout = &transport->tcp_timeout;
2305 xprt->connect_timeout = connect_timeout;
2306 }
2307 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2308 spin_unlock_bh(&xprt->transport_lock);
2309}
2310
16be2d20 2311static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2312{
16be2d20 2313 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2314 int ret = -ENOTCONN;
edb267a6 2315
ee0ac0c2 2316 if (!transport->inet) {
b0d93ad5 2317 struct sock *sk = sock->sk;
d88e4d82 2318 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
7f260e85 2319
d88e4d82
N		 2320 /* Avoid temporary address, they are bad for long-lived
2321 * connections such as NFS mounts.
2322 * RFC4941, section 3.6 suggests that:
2323 * Individual applications, which have specific
2324 * knowledge about the normal duration of connections,
2325 * MAY override this as appropriate.
2326 */
2327 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2328 (char *)&addr_pref, sizeof(addr_pref));
2329
8d1b8c62 2330 xs_tcp_set_socket_timeouts(xprt, sock);
775f06ab 2331
b0d93ad5
CL		 2332 write_lock_bh(&sk->sk_callback_lock);
2333
2a9e1cfa
TM		 2334 xs_save_old_callbacks(transport, sk);
2335
b0d93ad5 2336 sk->sk_user_data = xprt;
5157b956 2337 sk->sk_data_ready = xs_data_ready;
b0d93ad5
CL		 2338 sk->sk_state_change = xs_tcp_state_change;
2339 sk->sk_write_space = xs_tcp_write_space;
b4411457 2340 sock_set_flag(sk, SOCK_FASYNC);
2118071d 2341 sk->sk_error_report = xs_error_report;
c2126157 2342 sk->sk_allocation = GFP_NOIO;
3167e12c
CL		 2343
2344 /* socket options */
3167e12c 2345 sock_reset_flag(sk, SOCK_LINGER);
3167e12c 2346 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2347
2348 xprt_clear_connected(xprt);
2349
2350 /* Reset to new socket */
ee0ac0c2
CL		 2351 transport->sock = sock;
2352 transport->inet = sk;
b0d93ad5
CL		 2353
2354 write_unlock_bh(&sk->sk_callback_lock);
2355 }
2356
01d37c42 2357 if (!xprt_bound(xprt))
fe19a96b 2358 goto out;
01d37c42 2359
a564b8f0
MG		 2360 xs_set_memalloc(xprt);
2361
b0d93ad5 2362 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2363 xprt->stat.connect_count++;
2364 xprt->stat.connect_start = jiffies;
0fdea1e8 2365 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
fe19a96b
TM		 2366 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2367 switch (ret) {
2368 case 0:
4dda9c8a 2369 xs_set_srcport(transport, sock);
fe19a96b
TM		 2370 case -EINPROGRESS:
2371 /* SYN_SENT! */
fe19a96b
TM		 2372 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2373 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1f4c17a0
TM		 2374 break;
2375 case -EADDRNOTAVAIL:
2376 /* Source port number is unavailable. Try a new one! */
2377 transport->srcport = 0;
fe19a96b
TM		 2378 }
2379out:
2380 return ret;
16be2d20
CL		 2381}
2382
9903cd1c 2383/**
b61d59ff 2384 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
9903cd1c
CL		 2385 *
2386 * Invoked by a work queue tasklet.
a246b010 2387 */
cdd518d5 2388static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2389{
cdd518d5
PE		 2390 struct sock_xprt *transport =
2391 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2392 struct socket *sock = transport->sock;
a9f5f0f7 2393 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2394 int status = -EIO;
a246b010 2395
ee0ac0c2 2396 if (!sock) {
cdd518d5 2397 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2398 xs_addr(xprt)->sa_family, SOCK_STREAM,
2399 IPPROTO_TCP, true);
b61d59ff
TM		 2400 if (IS_ERR(sock)) {
2401 status = PTR_ERR(sock);
3167e12c
CL		 2402 goto out;
2403 }
7d1e8255 2404 }
a246b010 2405
c740eff8
CL		 2406 dprintk("RPC: worker connecting xprt %p via %s to "
2407 "%s (port %s)\n", xprt,
2408 xprt->address_strings[RPC_DISPLAY_PROTO],
2409 xprt->address_strings[RPC_DISPLAY_ADDR],
2410 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2411
16be2d20 2412 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2413 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2414 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2415 xprt, -status, xprt_connected(xprt),
2416 sock->sk->sk_state);
2a491991 2417 switch (status) {
f75e6745
TM		 2418 default:
2419 printk("%s: connect returned unhandled error %d\n",
2420 __func__, status);
2421 case -EADDRNOTAVAIL:
2422 /* We're probably in TIME_WAIT. Get rid of existing socket,
2423 * and retry
2424 */
a519fc7a 2425 xs_tcp_force_close(xprt);
88b5ed73 2426 break;
2a491991
TM		 2427 case 0:
2428 case -EINPROGRESS:
2429 case -EALREADY:
718ba5b8 2430 xprt_unlock_connect(xprt, transport);
7d1e8255 2431 return;
9fcfe0c8
TM		 2432 case -EINVAL:
2433 /* Happens, for instance, if the user specified a link
2434 * local IPv6 address without a scope-id.
2435 */
3ed5e2a2
TM		 2436 case -ECONNREFUSED:
2437 case -ECONNRESET:
2438 case -ENETUNREACH:
3913c78c 2439 case -EADDRINUSE:
3601c4a9 2440 case -ENOBUFS:
6ea44adc
N		 2441 /*
2442 * xs_tcp_force_close() wakes tasks with -EIO.
2443 * We need to wake them first to ensure the
2444 * correct error code.
2445 */
2446 xprt_wake_pending_tasks(xprt, status);
4efdd92c 2447 xs_tcp_force_close(xprt);
9fcfe0c8 2448 goto out;
a246b010 2449 }
2a491991 2450 status = -EAGAIN;
a246b010 2451out:
718ba5b8 2452 xprt_unlock_connect(xprt, transport);
68e220bd 2453 xprt_clear_connecting(xprt);
7d1e8255 2454 xprt_wake_pending_tasks(xprt, status);
68e220bd 2455}
b0d93ad5 2456
02910177
TM		 2457static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2458{
2459 unsigned long start, now = jiffies;
2460
2461 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2462 if (time_after(start, now))
2463 return start - now;
2464 return 0;
2465}
2466
3851f1cd
TM		 2467static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2468{
2469 xprt->reestablish_timeout <<= 1;
2470 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2471 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2472 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2473 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2474}
2475
9903cd1c
CL		 2476/**
2477 * xs_connect - connect a socket to a remote endpoint
1b092092 2478 * @xprt: pointer to transport structure
9903cd1c
CL		 2479 * @task: address of RPC task that manages state of connect request
2480 *
2481 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2482 *
2483 * UDP socket connects are synchronous, but we use a work queue anyway
2484 * to guarantee that even unprivileged user processes can set up a
2485 * socket on a privileged port.
2486 *
2487 * If a UDP socket connect fails, the delay behavior here prevents
2488 * retry floods (hard mounts).
9903cd1c 2489 */
1b092092 2490static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2491{
ee0ac0c2 2492 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
02910177 2493 unsigned long delay = 0;
a246b010 2494
718ba5b8
TM		 2495 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2496
99b1a4c3 2497 if (transport->sock != NULL) {
46121cf7
CL		 2498 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2499 "seconds\n",
03bf4b70 2500 xprt, xprt->reestablish_timeout / HZ);
99b1a4c3
TM		 2501
2502 /* Start by resetting any existing state */
2503 xs_reset_transport(transport);
2504
02910177 2505 delay = xs_reconnect_delay(xprt);
3851f1cd 2506 xs_reconnect_backoff(xprt);
02910177 2507
02910177 2508 } else
46121cf7 2509 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
02910177
TM		 2510
2511 queue_delayed_work(xprtiod_workqueue,
2512 &transport->connect_worker,
2513 delay);
a246b010
CL		 2514}
2515
176e21ee
CL		 2516/**
2517 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2518 * @xprt: rpc_xprt struct containing statistics
2519 * @seq: output file
2520 *
2521 */
2522static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2523{
2524 long idle_time = 0;
2525
2526 if (xprt_connected(xprt))
2527 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2528
2529 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2530 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2531 xprt->stat.bind_count,
2532 xprt->stat.connect_count,
2533 xprt->stat.connect_time,
2534 idle_time,
2535 xprt->stat.sends,
2536 xprt->stat.recvs,
2537 xprt->stat.bad_xids,
2538 xprt->stat.req_u,
15a45206
AA		 2539 xprt->stat.bklog_u,
2540 xprt->stat.max_slots,
2541 xprt->stat.sending_u,
2542 xprt->stat.pending_u);
176e21ee
CL		 2543}
2544
262ca07d
CL		 2545/**
2546 * xs_udp_print_stats - display UDP socket-specifc stats
2547 * @xprt: rpc_xprt struct containing statistics
2548 * @seq: output file
2549 *
2550 */
2551static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2552{
c8475461
CL		 2553 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2554
15a45206
AA		 2555 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2556 "%lu %llu %llu\n",
fbfffbd5 2557 transport->srcport,
262ca07d
CL		 2558 xprt->stat.bind_count,
2559 xprt->stat.sends,
2560 xprt->stat.recvs,
2561 xprt->stat.bad_xids,
2562 xprt->stat.req_u,
15a45206
AA		 2563 xprt->stat.bklog_u,
2564 xprt->stat.max_slots,
2565 xprt->stat.sending_u,
2566 xprt->stat.pending_u);
262ca07d
CL		 2567}
2568
2569/**
2570 * xs_tcp_print_stats - display TCP socket-specifc stats
2571 * @xprt: rpc_xprt struct containing statistics
2572 * @seq: output file
2573 *
2574 */
2575static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2576{
c8475461 2577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2578 long idle_time = 0;
2579
2580 if (xprt_connected(xprt))
2581 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2582
15a45206
AA		 2583 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2584 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2585 transport->srcport,
262ca07d
CL		 2586 xprt->stat.bind_count,
2587 xprt->stat.connect_count,
2588 xprt->stat.connect_time,
2589 idle_time,
2590 xprt->stat.sends,
2591 xprt->stat.recvs,
2592 xprt->stat.bad_xids,
2593 xprt->stat.req_u,
15a45206
AA		 2594 xprt->stat.bklog_u,
2595 xprt->stat.max_slots,
2596 xprt->stat.sending_u,
2597 xprt->stat.pending_u);
262ca07d
CL		 2598}
2599
4cfc7e60
RI		 2600/*
2601 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2602 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2603 * to use the server side send routines.
2604 */
5fe6eaa1 2605static int bc_malloc(struct rpc_task *task)
4cfc7e60 2606{
5fe6eaa1
CL		 2607 struct rpc_rqst *rqst = task->tk_rqstp;
2608 size_t size = rqst->rq_callsize;
4cfc7e60
RI		 2609 struct page *page;
2610 struct rpc_buffer *buf;
2611
5fe6eaa1
CL		 2612 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2613 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2614 size);
2615 return -EINVAL;
2616 }
4cfc7e60 2617
b8a13d03 2618 page = alloc_page(GFP_KERNEL);
4cfc7e60 2619 if (!page)
5fe6eaa1 2620 return -ENOMEM;
4cfc7e60
RI		 2621
2622 buf = page_address(page);
2623 buf->len = PAGE_SIZE;
2624
5fe6eaa1 2625 rqst->rq_buffer = buf->data;
18e601d6 2626 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
5fe6eaa1 2627 return 0;
4cfc7e60
RI		 2628}
2629
2630/*
2631 * Free the space allocated in the bc_alloc routine
2632 */
3435c74a 2633static void bc_free(struct rpc_task *task)
4cfc7e60 2634{
3435c74a 2635 void *buffer = task->tk_rqstp->rq_buffer;
4cfc7e60
RI		 2636 struct rpc_buffer *buf;
2637
4cfc7e60
RI		 2638 buf = container_of(buffer, struct rpc_buffer, data);
2639 free_page((unsigned long)buf);
2640}
2641
2642/*
2643 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2644 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2645 */
2646static int bc_sendto(struct rpc_rqst *req)
2647{
2648 int len;
2649 struct xdr_buf *xbufp = &req->rq_snd_buf;
2650 struct rpc_xprt *xprt = req->rq_xprt;
2651 struct sock_xprt *transport =
2652 container_of(xprt, struct sock_xprt, xprt);
2653 struct socket *sock = transport->sock;
2654 unsigned long headoff;
2655 unsigned long tailoff;
2656
61677eee 2657 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2658
2659 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2660 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2661 len = svc_send_common(sock, xbufp,
2662 virt_to_page(xbufp->head[0].iov_base), headoff,
2663 xbufp->tail[0].iov_base, tailoff);
2664
2665 if (len != xbufp->len) {
2666 printk(KERN_NOTICE "Error sending entire callback!\n");
2667 len = -EAGAIN;
2668 }
2669
2670 return len;
2671}
2672
2673/*
2674 * The send routine. Borrows from svc_send
2675 */
2676static int bc_send_request(struct rpc_task *task)
2677{
2678 struct rpc_rqst *req = task->tk_rqstp;
2679 struct svc_xprt *xprt;
7fc56136 2680 int len;
4cfc7e60
RI		 2681
2682 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2683 /*
2684 * Get the server socket associated with this callback xprt
2685 */
2686 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2687
2688 /*
2689 * Grab the mutex to serialize data as the connection is shared
2690 * with the fore channel
2691 */
2692 if (!mutex_trylock(&xprt->xpt_mutex)) {
2693 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2694 if (!mutex_trylock(&xprt->xpt_mutex))
2695 return -EAGAIN;
2696 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2697 }
2698 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2699 len = -ENOTCONN;
2700 else
2701 len = bc_sendto(req);
2702 mutex_unlock(&xprt->xpt_mutex);
2703
2704 if (len > 0)
2705 len = 0;
2706
2707 return len;
2708}
2709
2710/*
2711 * The close routine. Since this is client initiated, we do nothing
2712 */
2713
2714static void bc_close(struct rpc_xprt *xprt)
2715{
4cfc7e60
RI		 2716}
2717
2718/*
2719 * The xprt destroy routine. Again, because this connection is client
2720 * initiated, we do nothing
2721 */
2722
2723static void bc_destroy(struct rpc_xprt *xprt)
2724{
47f72efa
KM		 2725 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2726
2727 xs_xprt_free(xprt);
2728 module_put(THIS_MODULE);
4cfc7e60
RI		 2729}
2730
d31ae254 2731static const struct rpc_xprt_ops xs_local_ops = {
176e21ee
CL		 2732 .reserve_xprt = xprt_reserve_xprt,
2733 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2734 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2735 .rpcbind = xs_local_rpcbind,
2736 .set_port = xs_local_set_port,
dc107402 2737 .connect = xs_local_connect,
176e21ee
CL		 2738 .buf_alloc = rpc_malloc,
2739 .buf_free = rpc_free,
2740 .send_request = xs_local_send_request,
2741 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2742 .close = xs_close,
a1311d87 2743 .destroy = xs_destroy,
176e21ee 2744 .print_stats = xs_local_print_stats,
d67fa4d8
JL		 2745 .enable_swap = xs_enable_swap,
2746 .disable_swap = xs_disable_swap,
176e21ee
CL		 2747};
2748
d31ae254 2749static const struct rpc_xprt_ops xs_udp_ops = {
43118c29 2750 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2751 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2752 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2753 .alloc_slot = xprt_alloc_slot,
45160d62 2754 .rpcbind = rpcb_getport_async,
92200412 2755 .set_port = xs_set_port,
262965f5 2756 .connect = xs_connect,
02107148
CL		 2757 .buf_alloc = rpc_malloc,
2758 .buf_free = rpc_free,
262965f5 2759 .send_request = xs_udp_send_request,
fe3aca29 2760 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2761 .timer = xs_udp_timer,
a58dd398 2762 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2763 .close = xs_close,
2764 .destroy = xs_destroy,
262ca07d 2765 .print_stats = xs_udp_print_stats,
d67fa4d8
JL		 2766 .enable_swap = xs_enable_swap,
2767 .disable_swap = xs_disable_swap,
4a068258 2768 .inject_disconnect = xs_inject_disconnect,
262965f5
CL		 2769};
2770
d31ae254 2771static const struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2772 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2773 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2774 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2775 .rpcbind = rpcb_getport_async,
92200412 2776 .set_port = xs_set_port,
0b9e7943 2777 .connect = xs_connect,
02107148
CL		 2778 .buf_alloc = rpc_malloc,
2779 .buf_free = rpc_free,
262965f5 2780 .send_request = xs_tcp_send_request,
fe3aca29 2781 .set_retrans_timeout = xprt_set_retrans_timeout_def,
c627d31b 2782 .close = xs_tcp_shutdown,
9903cd1c 2783 .destroy = xs_destroy,
7196dbb0 2784 .set_connect_timeout = xs_tcp_set_connect_timeout,
262ca07d 2785 .print_stats = xs_tcp_print_stats,
d67fa4d8
JL		 2786 .enable_swap = xs_enable_swap,
2787 .disable_swap = xs_disable_swap,
4a068258 2788 .inject_disconnect = xs_inject_disconnect,
42e5c3e2
CL		 2789#ifdef CONFIG_SUNRPC_BACKCHANNEL
2790 .bc_setup = xprt_setup_bc,
76566773 2791 .bc_up = xs_tcp_bc_up,
6b26cc8c 2792 .bc_maxpayload = xs_tcp_bc_maxpayload,
42e5c3e2
CL		 2793 .bc_free_rqst = xprt_free_bc_rqst,
2794 .bc_destroy = xprt_destroy_bc,
2795#endif
a246b010
CL		 2796};
2797
4cfc7e60
RI		 2798/*
2799 * The rpc_xprt_ops for the server backchannel
2800 */
2801
d31ae254 2802static const struct rpc_xprt_ops bc_tcp_ops = {
4cfc7e60
RI		 2803 .reserve_xprt = xprt_reserve_xprt,
2804 .release_xprt = xprt_release_xprt,
84e28a30 2805 .alloc_slot = xprt_alloc_slot,
4cfc7e60
RI		 2806 .buf_alloc = bc_malloc,
2807 .buf_free = bc_free,
2808 .send_request = bc_send_request,
2809 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2810 .close = bc_close,
2811 .destroy = bc_destroy,
2812 .print_stats = xs_tcp_print_stats,
d67fa4d8
JL		 2813 .enable_swap = xs_enable_swap,
2814 .disable_swap = xs_disable_swap,
4a068258 2815 .inject_disconnect = xs_inject_disconnect,
4cfc7e60
RI		 2816};
2817
92476850
CL		 2818static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2819{
2820 static const struct sockaddr_in sin = {
2821 .sin_family = AF_INET,
2822 .sin_addr.s_addr = htonl(INADDR_ANY),
2823 };
2824 static const struct sockaddr_in6 sin6 = {
2825 .sin6_family = AF_INET6,
2826 .sin6_addr = IN6ADDR_ANY_INIT,
2827 };
2828
2829 switch (family) {
176e21ee
CL		 2830 case AF_LOCAL:
2831 break;
92476850
CL		 2832 case AF_INET:
2833 memcpy(sap, &sin, sizeof(sin));
2834 break;
2835 case AF_INET6:
2836 memcpy(sap, &sin6, sizeof(sin6));
2837 break;
2838 default:
2839 dprintk("RPC: %s: Bad address family\n", __func__);
2840 return -EAFNOSUPPORT;
2841 }
2842 return 0;
2843}
2844
3c341b0b 2845static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2846 unsigned int slot_table_size,
2847 unsigned int max_slot_table_size)
c8541ecd
CL		 2848{
2849 struct rpc_xprt *xprt;
ffc2e518 2850 struct sock_xprt *new;
c8541ecd 2851
96802a09 2852 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2853 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2854 return ERR_PTR(-EBADF);
2855 }
2856
d9ba131d
TM		 2857 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2858 max_slot_table_size);
bd1722d4 2859 if (xprt == NULL) {
46121cf7
CL		 2860 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2861 "rpc_xprt\n");
c8541ecd
CL		 2862 return ERR_PTR(-ENOMEM);
2863 }
c8541ecd 2864
bd1722d4 2865 new = container_of(xprt, struct sock_xprt, xprt);
edc1b01c 2866 mutex_init(&new->recv_mutex);
96802a09
FM		 2867 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2868 xprt->addrlen = args->addrlen;
d3bc9a1d 2869 if (args->srcaddr)
fbfffbd5 2870 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2871 else {
2872 int err;
2873 err = xs_init_anyaddr(args->dstaddr->sa_family,
2874 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2875 if (err != 0) {
2876 xprt_free(xprt);
92476850 2877 return ERR_PTR(err);
2aa13531 2878 }
92476850 2879 }
c8541ecd
CL		 2880
2881 return xprt;
2882}
2883
176e21ee
CL		 2884static const struct rpc_timeout xs_local_default_timeout = {
2885 .to_initval = 10 * HZ,
2886 .to_maxval = 10 * HZ,
2887 .to_retries = 2,
2888};
2889
2890/**
2891 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2892 * @args: rpc transport creation arguments
2893 *
2894 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2895 */
2896static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2897{
2898 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2899 struct sock_xprt *transport;
2900 struct rpc_xprt *xprt;
2901 struct rpc_xprt *ret;
2902
d9ba131d
TM		 2903 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2904 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2905 if (IS_ERR(xprt))
2906 return xprt;
2907 transport = container_of(xprt, struct sock_xprt, xprt);
2908
2909 xprt->prot = 0;
2910 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2911 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2912
2913 xprt->bind_timeout = XS_BIND_TO;
2914 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2915 xprt->idle_timeout = XS_IDLE_DISC_TO;
2916
2917 xprt->ops = &xs_local_ops;
2918 xprt->timeout = &xs_local_default_timeout;
2919
a2648094 2920 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
93dc41bd
N		 2921 INIT_DELAYED_WORK(&transport->connect_worker,
2922 xs_dummy_setup_socket);
2923
176e21ee
CL		 2924 switch (sun->sun_family) {
2925 case AF_LOCAL:
2926 if (sun->sun_path[0] != '/') {
2927 dprintk("RPC: bad AF_LOCAL address: %s\n",
2928 sun->sun_path);
2929 ret = ERR_PTR(-EINVAL);
2930 goto out_err;
2931 }
2932 xprt_set_bound(xprt);
176e21ee 2933 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2934 ret = ERR_PTR(xs_local_setup_socket(transport));
2935 if (ret)
2936 goto out_err;
176e21ee
CL		 2937 break;
2938 default:
2939 ret = ERR_PTR(-EAFNOSUPPORT);
2940 goto out_err;
2941 }
2942
2943 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2944 xprt->address_strings[RPC_DISPLAY_ADDR]);
2945
2946 if (try_module_get(THIS_MODULE))
2947 return xprt;
2948 ret = ERR_PTR(-EINVAL);
2949out_err:
315f3812 2950 xs_xprt_free(xprt);
176e21ee
CL		 2951 return ret;
2952}
2953
2881ae74
TM		 2954static const struct rpc_timeout xs_udp_default_timeout = {
2955 .to_initval = 5 * HZ,
2956 .to_maxval = 30 * HZ,
2957 .to_increment = 5 * HZ,
2958 .to_retries = 5,
2959};
2960
9903cd1c
CL		 2961/**
2962 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2963 * @args: rpc transport creation arguments
9903cd1c
CL		 2964 *
2965 */
483066d6 2966static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2967{
8f9d5b1a 2968 struct sockaddr *addr = args->dstaddr;
c8541ecd 2969 struct rpc_xprt *xprt;
c8475461 2970 struct sock_xprt *transport;
0a68b0be 2971 struct rpc_xprt *ret;
a246b010 2972
d9ba131d
TM		 2973 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2974 xprt_udp_slot_table_entries);
c8541ecd
CL		 2975 if (IS_ERR(xprt))
2976 return xprt;
c8475461 2977 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2978
ec739ef0 2979 xprt->prot = IPPROTO_UDP;
808012fb 2980 xprt->tsh_size = 0;
a246b010
CL		 2981 /* XXX: header size can vary due to auth type, IPv6, etc. */
2982 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2983
03bf4b70 2984 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2985 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2986 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2987
262965f5 2988 xprt->ops = &xs_udp_ops;
a246b010 2989
ba7392bb 2990 xprt->timeout = &xs_udp_default_timeout;
a246b010 2991
f9b2ee71 2992 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
edc1b01c
TM		 2993 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2994
8f9d5b1a
CL		 2995 switch (addr->sa_family) {
2996 case AF_INET:
2997 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2998 xprt_set_bound(xprt);
2999
9dc3b095 3000 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 3001 break;
3002 case AF_INET6:
3003 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3004 xprt_set_bound(xprt);
3005
9dc3b095 3006 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 3007 break;
3008 default:
0a68b0be
BF		 3009 ret = ERR_PTR(-EAFNOSUPPORT);
3010 goto out_err;
8f9d5b1a
CL		 3011 }
3012
c740eff8
CL		 3013 if (xprt_bound(xprt))
3014 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3015 xprt->address_strings[RPC_DISPLAY_ADDR],
3016 xprt->address_strings[RPC_DISPLAY_PORT],
3017 xprt->address_strings[RPC_DISPLAY_PROTO]);
3018 else
3019 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3020 xprt->address_strings[RPC_DISPLAY_ADDR],
3021 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 3022
bc25571e
TT		 3023 if (try_module_get(THIS_MODULE))
3024 return xprt;
0a68b0be
BF		 3025 ret = ERR_PTR(-EINVAL);
3026out_err:
315f3812 3027 xs_xprt_free(xprt);
0a68b0be 3028 return ret;
a246b010
CL		 3029}
3030
2881ae74
TM		 3031static const struct rpc_timeout xs_tcp_default_timeout = {
3032 .to_initval = 60 * HZ,
3033 .to_maxval = 60 * HZ,
3034 .to_retries = 2,
3035};
3036
9903cd1c
CL		 3037/**
3038 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 3039 * @args: rpc transport creation arguments
9903cd1c
CL		 3040 *
3041 */
483066d6 3042static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 3043{
8f9d5b1a 3044 struct sockaddr *addr = args->dstaddr;
c8541ecd 3045 struct rpc_xprt *xprt;
c8475461 3046 struct sock_xprt *transport;
0a68b0be 3047 struct rpc_xprt *ret;
b7993ceb
TM		 3048 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3049
3050 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3051 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 3052
d9ba131d 3053 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 3054 max_slot_table_size);
c8541ecd
CL		 3055 if (IS_ERR(xprt))
3056 return xprt;
c8475461 3057 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 3058
ec739ef0 3059 xprt->prot = IPPROTO_TCP;
808012fb 3060 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 3061 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 3062
03bf4b70 3063 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 3064 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3065 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 3066
262965f5 3067 xprt->ops = &xs_tcp_ops;
ba7392bb 3068 xprt->timeout = &xs_tcp_default_timeout;
a246b010 3069
3851f1cd 3070 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
7196dbb0
TM		 3071 xprt->connect_timeout = xprt->timeout->to_initval *
3072 (xprt->timeout->to_retries + 1);
3851f1cd 3073
edc1b01c
TM		 3074 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
3075 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3076
8f9d5b1a
CL		 3077 switch (addr->sa_family) {
3078 case AF_INET:
3079 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3080 xprt_set_bound(xprt);
3081
9dc3b095 3082 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 3083 break;
3084 case AF_INET6:
3085 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3086 xprt_set_bound(xprt);
3087
9dc3b095 3088 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 3089 break;
3090 default:
0a68b0be
BF		 3091 ret = ERR_PTR(-EAFNOSUPPORT);
3092 goto out_err;
8f9d5b1a
CL		 3093 }
3094
c740eff8
CL		 3095 if (xprt_bound(xprt))
3096 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3097 xprt->address_strings[RPC_DISPLAY_ADDR],
3098 xprt->address_strings[RPC_DISPLAY_PORT],
3099 xprt->address_strings[RPC_DISPLAY_PROTO]);
3100 else
3101 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3102 xprt->address_strings[RPC_DISPLAY_ADDR],
3103 xprt->address_strings[RPC_DISPLAY_PROTO]);
3104
bc25571e
TT		 3105 if (try_module_get(THIS_MODULE))
3106 return xprt;
0a68b0be
BF		 3107 ret = ERR_PTR(-EINVAL);
3108out_err:
315f3812 3109 xs_xprt_free(xprt);
0a68b0be 3110 return ret;
a246b010 3111}
282b32e1 3112
f300baba
AB		 3113/**
3114 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3115 * @args: rpc transport creation arguments
3116 *
3117 */
3118static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3119{
3120 struct sockaddr *addr = args->dstaddr;
3121 struct rpc_xprt *xprt;
3122 struct sock_xprt *transport;
3123 struct svc_sock *bc_sock;
0a68b0be 3124 struct rpc_xprt *ret;
f300baba 3125
d9ba131d
TM		 3126 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3127 xprt_tcp_slot_table_entries);
f300baba
AB		 3128 if (IS_ERR(xprt))
3129 return xprt;
3130 transport = container_of(xprt, struct sock_xprt, xprt);
3131
3132 xprt->prot = IPPROTO_TCP;
3133 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3134 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3135 xprt->timeout = &xs_tcp_default_timeout;
3136
3137 /* backchannel */
3138 xprt_set_bound(xprt);
3139 xprt->bind_timeout = 0;
f300baba
AB		 3140 xprt->reestablish_timeout = 0;
3141 xprt->idle_timeout = 0;
3142
f300baba
AB		 3143 xprt->ops = &bc_tcp_ops;
3144
3145 switch (addr->sa_family) {
3146 case AF_INET:
3147 xs_format_peer_addresses(xprt, "tcp",
3148 RPCBIND_NETID_TCP);
3149 break;
3150 case AF_INET6:
3151 xs_format_peer_addresses(xprt, "tcp",
3152 RPCBIND_NETID_TCP6);
3153 break;
3154 default:
0a68b0be
BF		 3155 ret = ERR_PTR(-EAFNOSUPPORT);
3156 goto out_err;
f300baba
AB		 3157 }
3158
50fa0d40
PE		 3159 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3160 xprt->address_strings[RPC_DISPLAY_ADDR],
3161 xprt->address_strings[RPC_DISPLAY_PORT],
3162 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 3163
99de8ea9
BF		 3164 /*
3165 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 3166 * we want to keep it around as long as the connection lasts,
3167 * in case we need to start using it for a backchannel again;
3168 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 3169 */
3170 xprt_get(xprt);
3171 args->bc_xprt->xpt_bc_xprt = xprt;
3172 xprt->bc_xprt = args->bc_xprt;
3173 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3174 transport->sock = bc_sock->sk_sock;
3175 transport->inet = bc_sock->sk_sk;
3176
f300baba
AB		 3177 /*
3178 * Since we don't want connections for the backchannel, we set
3179 * the xprt status to connected
3180 */
3181 xprt_set_connected(xprt);
3182
f300baba
AB		 3183 if (try_module_get(THIS_MODULE))
3184 return xprt;
642aab58
KM		 3185
3186 args->bc_xprt->xpt_bc_xprt = NULL;
39a9beab 3187 args->bc_xprt->xpt_bc_xps = NULL;
99de8ea9 3188 xprt_put(xprt);
0a68b0be
BF		 3189 ret = ERR_PTR(-EINVAL);
3190out_err:
315f3812 3191 xs_xprt_free(xprt);
0a68b0be 3192 return ret;
f300baba
AB		 3193}
3194
176e21ee
CL		 3195static struct xprt_class xs_local_transport = {
3196 .list = LIST_HEAD_INIT(xs_local_transport.list),
3197 .name = "named UNIX socket",
3198 .owner = THIS_MODULE,
3199 .ident = XPRT_TRANSPORT_LOCAL,
3200 .setup = xs_setup_local,
3201};
3202
bc25571e
TT		 3203static struct xprt_class xs_udp_transport = {
3204 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3205 .name = "udp",
3206 .owner = THIS_MODULE,
f300baba 3207 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 3208 .setup = xs_setup_udp,
3209};
3210
3211static struct xprt_class xs_tcp_transport = {
3212 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3213 .name = "tcp",
3214 .owner = THIS_MODULE,
f300baba 3215 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 3216 .setup = xs_setup_tcp,
3217};
3218
f300baba
AB		 3219static struct xprt_class xs_bc_tcp_transport = {
3220 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3221 .name = "tcp NFSv4.1 backchannel",
3222 .owner = THIS_MODULE,
3223 .ident = XPRT_TRANSPORT_BC_TCP,
3224 .setup = xs_setup_bc_tcp,
3225};
3226
282b32e1 3227/**
bc25571e 3228 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 3229 *
3230 */
3231int init_socket_xprt(void)
3232{
f895b252 3233#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2b1bec5f 3234 if (!sunrpc_table_header)
0b4d4147 3235 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 3236#endif
3237
176e21ee 3238 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 3239 xprt_register_transport(&xs_udp_transport);
3240 xprt_register_transport(&xs_tcp_transport);
f300baba 3241 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 3242
282b32e1
CL		 3243 return 0;
3244}
3245
3246/**
bc25571e 3247 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 3248 *
3249 */
3250void cleanup_socket_xprt(void)
3251{
f895b252 3252#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
fbf76683
CL		 3253 if (sunrpc_table_header) {
3254 unregister_sysctl_table(sunrpc_table_header);
3255 sunrpc_table_header = NULL;
3256 }
3257#endif
bc25571e 3258
176e21ee 3259 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 3260 xprt_unregister_transport(&xs_udp_transport);
3261 xprt_unregister_transport(&xs_tcp_transport);
f300baba 3262 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 3263}
cbf11071 3264
9bbb9e5a
RR		 3265static int param_set_uint_minmax(const char *val,
3266 const struct kernel_param *kp,
cbf11071
TM		 3267 unsigned int min, unsigned int max)
3268{
00cfaa94 3269 unsigned int num;
cbf11071
TM		 3270 int ret;
3271
3272 if (!val)
3273 return -EINVAL;
00cfaa94 3274 ret = kstrtouint(val, 0, &num);
9761a246
DC		 3275 if (ret)
3276 return ret;
3277 if (num < min || num > max)
cbf11071
TM		 3278 return -EINVAL;
3279 *((unsigned int *)kp->arg) = num;
3280 return 0;
3281}
3282
9bbb9e5a 3283static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071 3284{
ffb6ca33
FS		 3285 if (kp->arg == &xprt_min_resvport)
3286 return param_set_uint_minmax(val, kp,
cbf11071 3287 RPC_MIN_RESVPORT,
ffb6ca33
FS		 3288 xprt_max_resvport);
3289 return param_set_uint_minmax(val, kp,
3290 xprt_min_resvport,
cbf11071
TM		 3291 RPC_MAX_RESVPORT);
3292}
3293
9c27847d 3294static const struct kernel_param_ops param_ops_portnr = {
9bbb9e5a
RR		 3295 .set = param_set_portnr,
3296 .get = param_get_uint,
3297};
3298
cbf11071
TM		 3299#define param_check_portnr(name, p) \
3300 __param_check(name, p, unsigned int);
3301
3302module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3303module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3304
9bbb9e5a
RR		 3305static int param_set_slot_table_size(const char *val,
3306 const struct kernel_param *kp)
cbf11071
TM		 3307{
3308 return param_set_uint_minmax(val, kp,
3309 RPC_MIN_SLOT_TABLE,
3310 RPC_MAX_SLOT_TABLE);
3311}
3312
9c27847d 3313static const struct kernel_param_ops param_ops_slot_table_size = {
9bbb9e5a
RR		 3314 .set = param_set_slot_table_size,
3315 .get = param_get_uint,
3316};
3317
cbf11071
TM		 3318#define param_check_slot_table_size(name, p) \
3319 __param_check(name, p, unsigned int);
3320
d9ba131d
TM		 3321static int param_set_max_slot_table_size(const char *val,
3322 const struct kernel_param *kp)
3323{
3324 return param_set_uint_minmax(val, kp,
3325 RPC_MIN_SLOT_TABLE,
3326 RPC_MAX_SLOT_TABLE_LIMIT);
3327}
3328
9c27847d 3329static const struct kernel_param_ops param_ops_max_slot_table_size = {
d9ba131d
TM		 3330 .set = param_set_max_slot_table_size,
3331 .get = param_get_uint,
3332};
3333
3334#define param_check_max_slot_table_size(name, p) \
3335 __param_check(name, p, unsigned int);
3336
cbf11071
TM		 3337module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3338 slot_table_size, 0644);
d9ba131d
TM		 3339module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3340 max_slot_table_size, 0644);
cbf11071
TM		 3341module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3342 slot_table_size, 0644);
3343
Linux 6.x block layer and io_uring tree(s)