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Merge tag 'platform-drivers-x86-v4.2-1' of git://git.infradead.org/users/dvhart/linux...
[deliverable/linux.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);
55
c556b754
CL		 56/*
57 * xprtsock tunables
58 */
09acfea5
TM		 59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 62
09acfea5
TM		 63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 65
54c09874
TM		 66#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
67
7d1e8255 68#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 69static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 70
fbf76683
CL		 71/*
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
75 *
76 * We simply need to make sure that we don't collide with
77 * someone else's file names!
78 */
79
fbf76683
CL		 80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
fe2c6338 92static struct ctl_table xs_tunables_table[] = {
fbf76683 93 {
fbf76683
CL		 94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
6d456111 98 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
fbf76683
CL		 103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
6d456111 107 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
d9ba131d
TM		 111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
fbf76683 120 {
fbf76683
CL		 121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
6d456111 125 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
fbf76683
CL		 130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
6d456111 134 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
25fe6142
TM		 138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
6d456111 143 .proc_handler = proc_dointvec_jiffies,
fbf76683 144 },
f8572d8f 145 { },
fbf76683
CL		 146};
147
fe2c6338 148static struct ctl_table sunrpc_table[] = {
fbf76683 149 {
fbf76683
CL		 150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
f8572d8f 154 { },
fbf76683
CL		 155};
156
157#endif
158
03bf4b70
CL		 159/*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
f895b252 189#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
a246b010 190# undef RPC_DEBUG_DATA
9903cd1c 191# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 192#endif
193
a246b010 194#ifdef RPC_DEBUG_DATA
9903cd1c 195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 196{
9903cd1c
CL		 197 u8 *buf = (u8 *) packet;
198 int j;
a246b010 199
46121cf7 200 dprintk("RPC: %s\n", msg);
a246b010
CL		 201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
9903cd1c 213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 214{
215 /* NOP */
216}
217#endif
218
2118071d
TM		 219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220{
221 return (struct rpc_xprt *) sk->sk_user_data;
222}
223
95392c59
CL		 224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225{
226 return (struct sockaddr *) &xprt->addr;
227}
228
176e21ee
CL		 229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230{
231 return (struct sockaddr_un *) &xprt->addr;
232}
233
95392c59 234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 235{
95392c59
CL		 236 return (struct sockaddr_in *) &xprt->addr;
237}
238
239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_in6 *) &xprt->addr;
242}
243
c877b849 244static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 245{
c877b849 246 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 247 struct sockaddr_in6 *sin6;
248 struct sockaddr_in *sin;
176e21ee 249 struct sockaddr_un *sun;
c877b849 250 char buf[128];
edb267a6 251
9dc3b095 252 switch (sap->sa_family) {
176e21ee
CL		 253 case AF_LOCAL:
254 sun = xs_addr_un(xprt);
255 strlcpy(buf, sun->sun_path, sizeof(buf));
256 xprt->address_strings[RPC_DISPLAY_ADDR] =
257 kstrdup(buf, GFP_KERNEL);
258 break;
9dc3b095 259 case AF_INET:
176e21ee
CL		 260 (void)rpc_ntop(sap, buf, sizeof(buf));
261 xprt->address_strings[RPC_DISPLAY_ADDR] =
262 kstrdup(buf, GFP_KERNEL);
9dc3b095 263 sin = xs_addr_in(xprt);
fc0b5791 264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 265 break;
266 case AF_INET6:
176e21ee
CL		 267 (void)rpc_ntop(sap, buf, sizeof(buf));
268 xprt->address_strings[RPC_DISPLAY_ADDR] =
269 kstrdup(buf, GFP_KERNEL);
9dc3b095 270 sin6 = xs_addr_in6(xprt);
fc0b5791 271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 272 break;
273 default:
274 BUG();
756805e7 275 }
176e21ee 276
9dc3b095 277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 278}
279
9dc3b095 280static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 281{
9dc3b095
CL		 282 struct sockaddr *sap = xs_addr(xprt);
283 char buf[128];
4b6473fb 284
81160e66 285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 287
81160e66 288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
290}
4b6473fb 291
9dc3b095
CL		 292static void xs_format_peer_addresses(struct rpc_xprt *xprt,
293 const char *protocol,
294 const char *netid)
c877b849 295{
b454ae90 296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 297 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 298 xs_format_common_peer_addresses(xprt);
9dc3b095 299 xs_format_common_peer_ports(xprt);
edb267a6 300}
4b6473fb 301
9dc3b095 302static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 303{
9dc3b095
CL		 304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 306
9dc3b095 307 xs_format_common_peer_ports(xprt);
edb267a6
CL		 308}
309
310static void xs_free_peer_addresses(struct rpc_xprt *xprt)
311{
33e01dc7
CL		 312 unsigned int i;
313
314 for (i = 0; i < RPC_DISPLAY_MAX; i++)
315 switch (i) {
316 case RPC_DISPLAY_PROTO:
317 case RPC_DISPLAY_NETID:
318 continue;
319 default:
320 kfree(xprt->address_strings[i]);
321 }
edb267a6
CL		 322}
323
b4b5cc85
CL		 324#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
325
24c5684b 326static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 327{
b4b5cc85
CL		 328 struct msghdr msg = {
329 .msg_name = addr,
330 .msg_namelen = addrlen,
24c5684b
TM		 331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
332 };
333 struct kvec iov = {
334 .iov_base = vec->iov_base + base,
335 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 336 };
337
24c5684b 338 if (iov.iov_len != 0)
b4b5cc85
CL		 339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
340 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
341}
342
f279cd00 343static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
b4b5cc85 344{
a6b31d18
TM		 345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
346 int offset, size_t size, int flags);
24c5684b
TM		 347 struct page **ppage;
348 unsigned int remainder;
f279cd00 349 int err;
24c5684b
TM		 350
351 remainder = xdr->page_len - base;
352 base += xdr->page_base;
353 ppage = xdr->pages + (base >> PAGE_SHIFT);
354 base &= ~PAGE_MASK;
a6b31d18
TM		 355 do_sendpage = sock->ops->sendpage;
356 if (!zerocopy)
357 do_sendpage = sock_no_sendpage;
24c5684b
TM		 358 for(;;) {
359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
360 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 361
24c5684b
TM		 362 remainder -= len;
363 if (remainder != 0 || more)
364 flags |= MSG_MORE;
a6b31d18 365 err = do_sendpage(sock, *ppage, base, len, flags);
24c5684b
TM		 366 if (remainder == 0 || err != len)
367 break;
f279cd00 368 *sent_p += err;
24c5684b
TM		 369 ppage++;
370 base = 0;
371 }
f279cd00
JB		 372 if (err > 0) {
373 *sent_p += err;
374 err = 0;
375 }
376 return err;
b4b5cc85
CL		 377}
378
9903cd1c
CL		 379/**
380 * xs_sendpages - write pages directly to a socket
381 * @sock: socket to send on
382 * @addr: UDP only -- address of destination
383 * @addrlen: UDP only -- length of destination address
384 * @xdr: buffer containing this request
385 * @base: starting position in the buffer
a6b31d18 386 * @zerocopy: true if it is safe to use sendpage()
f279cd00 387 * @sent_p: return the total number of bytes successfully queued for sending
9903cd1c 388 *
a246b010 389 */
f279cd00 390static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
a246b010 391{
24c5684b 392 unsigned int remainder = xdr->len - base;
f279cd00
JB		 393 int err = 0;
394 int sent = 0;
a246b010 395
262965f5 396 if (unlikely(!sock))
fba91afb 397 return -ENOTSOCK;
262965f5
CL		 398
399 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 400 if (base != 0) {
401 addr = NULL;
402 addrlen = 0;
403 }
262965f5 404
24c5684b
TM		 405 if (base < xdr->head[0].iov_len || addr != NULL) {
406 unsigned int len = xdr->head[0].iov_len - base;
407 remainder -= len;
408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
409 if (remainder == 0 || err != len)
a246b010 410 goto out;
f279cd00 411 *sent_p += err;
a246b010
CL		 412 base = 0;
413 } else
24c5684b 414 base -= xdr->head[0].iov_len;
a246b010 415
24c5684b
TM		 416 if (base < xdr->page_len) {
417 unsigned int len = xdr->page_len - base;
418 remainder -= len;
f279cd00
JB		 419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
420 *sent_p += sent;
421 if (remainder == 0 || sent != len)
a246b010
CL		 422 goto out;
423 base = 0;
24c5684b
TM		 424 } else
425 base -= xdr->page_len;
426
427 if (base >= xdr->tail[0].iov_len)
f279cd00 428 return 0;
24c5684b 429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 430out:
f279cd00
JB		 431 if (err > 0) {
432 *sent_p += err;
433 err = 0;
434 }
435 return err;
a246b010
CL		 436}
437
b6ddf64f
TM		 438static void xs_nospace_callback(struct rpc_task *task)
439{
440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
441
442 transport->inet->sk_write_pending--;
443 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
444}
445
9903cd1c 446/**
262965f5
CL		 447 * xs_nospace - place task on wait queue if transmit was incomplete
448 * @task: task to put to sleep
9903cd1c 449 *
a246b010 450 */
5e3771ce 451static int xs_nospace(struct rpc_task *task)
a246b010 452{
262965f5
CL		 453 struct rpc_rqst *req = task->tk_rqstp;
454 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
06ea0bfe 456 struct sock *sk = transport->inet;
24ca9a84 457 int ret = -EAGAIN;
a246b010 458
46121cf7 459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 460 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
461 req->rq_slen);
462
b6ddf64f
TM		 463 /* Protect against races with write_space */
464 spin_lock_bh(&xprt->transport_lock);
465
466 /* Don't race with disconnect */
467 if (xprt_connected(xprt)) {
468 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
469 /*
470 * Notify TCP that we're limited by the application
471 * window size
472 */
473 set_bit(SOCK_NOSPACE, &transport->sock->flags);
06ea0bfe 474 sk->sk_write_pending++;
b6ddf64f
TM		 475 /* ...and wait for more buffer space */
476 xprt_wait_for_buffer_space(task, xs_nospace_callback);
477 }
478 } else {
479 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 480 ret = -ENOTCONN;
b6ddf64f 481 }
262965f5 482
b6ddf64f 483 spin_unlock_bh(&xprt->transport_lock);
06ea0bfe
TM		 484
485 /* Race breaker in case memory is freed before above code is called */
486 sk->sk_write_space(sk);
5e3771ce 487 return ret;
262965f5
CL		 488}
489
61677eee
CL		 490/*
491 * Construct a stream transport record marker in @buf.
492 */
493static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
494{
495 u32 reclen = buf->len - sizeof(rpc_fraghdr);
496 rpc_fraghdr *base = buf->head[0].iov_base;
497 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
498}
499
176e21ee
CL		 500/**
501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
502 * @task: RPC task that manages the state of an RPC request
503 *
504 * Return values:
505 * 0: The request has been sent
506 * EAGAIN: The socket was blocked, please call again later to
507 * complete the request
508 * ENOTCONN: Caller needs to invoke connect logic then call again
509 * other: Some other error occured, the request was not sent
510 */
511static int xs_local_send_request(struct rpc_task *task)
512{
513 struct rpc_rqst *req = task->tk_rqstp;
514 struct rpc_xprt *xprt = req->rq_xprt;
515 struct sock_xprt *transport =
516 container_of(xprt, struct sock_xprt, xprt);
517 struct xdr_buf *xdr = &req->rq_snd_buf;
518 int status;
f279cd00 519 int sent = 0;
176e21ee
CL		 520
521 xs_encode_stream_record_marker(&req->rq_snd_buf);
522
523 xs_pktdump("packet data:",
524 req->rq_svec->iov_base, req->rq_svec->iov_len);
525
f279cd00
JB		 526 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
527 true, &sent);
176e21ee
CL		 528 dprintk("RPC: %s(%u) = %d\n",
529 __func__, xdr->len - req->rq_bytes_sent, status);
f279cd00
JB		 530 if (likely(sent > 0) || status == 0) {
531 req->rq_bytes_sent += sent;
532 req->rq_xmit_bytes_sent += sent;
176e21ee
CL		 533 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
534 req->rq_bytes_sent = 0;
535 return 0;
536 }
537 status = -EAGAIN;
538 }
539
540 switch (status) {
3601c4a9 541 case -ENOBUFS:
176e21ee
CL		 542 case -EAGAIN:
543 status = xs_nospace(task);
544 break;
545 default:
546 dprintk("RPC: sendmsg returned unrecognized error %d\n",
547 -status);
548 case -EPIPE:
549 xs_close(xprt);
550 status = -ENOTCONN;
551 }
552
553 return status;
554}
555
262965f5
CL		 556/**
557 * xs_udp_send_request - write an RPC request to a UDP socket
558 * @task: address of RPC task that manages the state of an RPC request
559 *
560 * Return values:
561 * 0: The request has been sent
562 * EAGAIN: The socket was blocked, please call again later to
563 * complete the request
564 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 565 * other: Some other error occurred, the request was not sent
262965f5
CL		 566 */
567static int xs_udp_send_request(struct rpc_task *task)
568{
569 struct rpc_rqst *req = task->tk_rqstp;
570 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 571 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 572 struct xdr_buf *xdr = &req->rq_snd_buf;
f279cd00 573 int sent = 0;
262965f5 574 int status;
a246b010 575
9903cd1c 576 xs_pktdump("packet data:",
a246b010
CL		 577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
01d37c42
TM		 580 if (!xprt_bound(xprt))
581 return -ENOTCONN;
f279cd00
JB		 582 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
583 xdr, req->rq_bytes_sent, true, &sent);
a246b010 584
46121cf7 585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 586 xdr->len - req->rq_bytes_sent, status);
a246b010 587
3dedbb5c
JB		 588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
589 if (status == -EPERM)
590 goto process_status;
591
f279cd00
JB		 592 if (sent > 0 || status == 0) {
593 req->rq_xmit_bytes_sent += sent;
594 if (sent >= req->rq_slen)
2199700f
TM		 595 return 0;
596 /* Still some bytes left; set up for a retry later. */
262965f5 597 status = -EAGAIN;
2199700f 598 }
a246b010 599
3dedbb5c 600process_status:
262965f5 601 switch (status) {
fba91afb
TM		 602 case -ENOTSOCK:
603 status = -ENOTCONN;
604 /* Should we call xs_close() here? */
605 break;
b6ddf64f 606 case -EAGAIN:
5e3771ce 607 status = xs_nospace(task);
b6ddf64f 608 break;
c8485e4d
TM		 609 default:
610 dprintk("RPC: sendmsg returned unrecognized error %d\n",
611 -status);
262965f5 612 case -ENETUNREACH:
3601c4a9 613 case -ENOBUFS:
262965f5 614 case -EPIPE:
a246b010 615 case -ECONNREFUSED:
3dedbb5c 616 case -EPERM:
a246b010 617 /* When the server has died, an ICMP port unreachable message
9903cd1c 618 * prompts ECONNREFUSED. */
b6ddf64f 619 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 620 }
5fe46e9d 621
262965f5 622 return status;
a246b010
CL		 623}
624
e06799f9
TM		 625/**
626 * xs_tcp_shutdown - gracefully shut down a TCP socket
627 * @xprt: transport
628 *
629 * Initiates a graceful shutdown of the TCP socket by calling the
0efeac26 630 * equivalent of shutdown(SHUT_RDWR);
e06799f9
TM		 631 */
632static void xs_tcp_shutdown(struct rpc_xprt *xprt)
633{
634 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
635 struct socket *sock = transport->sock;
636
40b5ea0c 637 if (sock != NULL) {
0efeac26 638 kernel_sock_shutdown(sock, SHUT_RDWR);
40b5ea0c
TM		 639 trace_rpc_socket_shutdown(xprt, sock);
640 }
e06799f9
TM		 641}
642
9903cd1c 643/**
262965f5 644 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 645 * @task: address of RPC task that manages the state of an RPC request
646 *
647 * Return values:
262965f5
CL		 648 * 0: The request has been sent
649 * EAGAIN: The socket was blocked, please call again later to
650 * complete the request
651 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 652 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 653 *
654 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 655 * if sendmsg is not able to make progress?
9903cd1c 656 */
262965f5 657static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 658{
659 struct rpc_rqst *req = task->tk_rqstp;
660 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 662 struct xdr_buf *xdr = &req->rq_snd_buf;
a6b31d18 663 bool zerocopy = true;
b595bb15 664 int status;
f279cd00 665 int sent;
a246b010 666
61677eee 667 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 668
262965f5
CL		 669 xs_pktdump("packet data:",
670 req->rq_svec->iov_base,
671 req->rq_svec->iov_len);
a6b31d18
TM		 672 /* Don't use zero copy if this is a resend. If the RPC call
673 * completes while the socket holds a reference to the pages,
674 * then we may end up resending corrupted data.
675 */
676 if (task->tk_flags & RPC_TASK_SENT)
677 zerocopy = false;
a246b010
CL		 678
679 /* Continue transmitting the packet/record. We must be careful
680 * to cope with writespace callbacks arriving _after_ we have
262965f5 681 * called sendmsg(). */
a246b010 682 while (1) {
f279cd00
JB		 683 sent = 0;
684 status = xs_sendpages(transport->sock, NULL, 0, xdr,
685 req->rq_bytes_sent, zerocopy, &sent);
a246b010 686
46121cf7 687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 688 xdr->len - req->rq_bytes_sent, status);
a246b010 689
f279cd00 690 if (unlikely(sent == 0 && status < 0))
a246b010 691 break;
a246b010 692
262965f5
CL		 693 /* If we've sent the entire packet, immediately
694 * reset the count of bytes sent. */
f279cd00
JB		 695 req->rq_bytes_sent += sent;
696 req->rq_xmit_bytes_sent += sent;
262965f5
CL		 697 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
698 req->rq_bytes_sent = 0;
699 return 0;
700 }
a246b010 701
f279cd00 702 if (sent != 0)
06b4b681 703 continue;
a246b010 704 status = -EAGAIN;
06b4b681 705 break;
a246b010
CL		 706 }
707
262965f5 708 switch (status) {
fba91afb
TM		 709 case -ENOTSOCK:
710 status = -ENOTCONN;
711 /* Should we call xs_close() here? */
712 break;
3601c4a9 713 case -ENOBUFS:
262965f5 714 case -EAGAIN:
5e3771ce 715 status = xs_nospace(task);
262965f5 716 break;
c8485e4d
TM		 717 default:
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
719 -status);
262965f5 720 case -ECONNRESET:
2a9e1cfa 721 case -ECONNREFUSED:
262965f5 722 case -ENOTCONN:
3913c78c 723 case -EADDRINUSE:
b9d2bb2e 724 case -EPIPE:
b6ddf64f 725 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 726 }
5fe46e9d 727
a246b010
CL		 728 return status;
729}
730
e0ab53de
TM		 731/**
732 * xs_tcp_release_xprt - clean up after a tcp transmission
733 * @xprt: transport
734 * @task: rpc task
735 *
736 * This cleans up if an error causes us to abort the transmission of a request.
737 * In this case, the socket may need to be reset in order to avoid confusing
738 * the server.
739 */
740static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
741{
742 struct rpc_rqst *req;
743
744 if (task != xprt->snd_task)
745 return;
746 if (task == NULL)
747 goto out_release;
748 req = task->tk_rqstp;
43cedbf0
TM		 749 if (req == NULL)
750 goto out_release;
e0ab53de
TM		 751 if (req->rq_bytes_sent == 0)
752 goto out_release;
753 if (req->rq_bytes_sent == req->rq_snd_buf.len)
754 goto out_release;
a4f0835c 755 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 756out_release:
757 xprt_release_xprt(xprt, task);
758}
759
2a9e1cfa
TM		 760static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
761{
762 transport->old_data_ready = sk->sk_data_ready;
763 transport->old_state_change = sk->sk_state_change;
764 transport->old_write_space = sk->sk_write_space;
2118071d 765 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 766}
767
768static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
769{
770 sk->sk_data_ready = transport->old_data_ready;
771 sk->sk_state_change = transport->old_state_change;
772 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 773 sk->sk_error_report = transport->old_error_report;
774}
775
b70ae915
TM		 776static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
777{
778 smp_mb__before_atomic();
779 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
780 clear_bit(XPRT_CLOSING, &xprt->state);
781 smp_mb__after_atomic();
782}
783
784static void xs_sock_mark_closed(struct rpc_xprt *xprt)
785{
786 xs_sock_reset_connection_flags(xprt);
787 /* Mark transport as closed and wake up all pending tasks */
788 xprt_disconnect_done(xprt);
789}
790
2118071d
TM		 791/**
792 * xs_error_report - callback to handle TCP socket state errors
793 * @sk: socket
794 *
795 * Note: we don't call sock_error() since there may be a rpc_task
796 * using the socket, and so we don't want to clear sk->sk_err.
797 */
798static void xs_error_report(struct sock *sk)
799{
800 struct rpc_xprt *xprt;
801 int err;
802
803 read_lock_bh(&sk->sk_callback_lock);
804 if (!(xprt = xprt_from_sock(sk)))
805 goto out;
806
807 err = -sk->sk_err;
808 if (err == 0)
809 goto out;
b70ae915
TM		 810 /* Is this a reset event? */
811 if (sk->sk_state == TCP_CLOSE)
812 xs_sock_mark_closed(xprt);
2118071d
TM		 813 dprintk("RPC: xs_error_report client %p, error=%d...\n",
814 xprt, -err);
e8353c76 815 trace_rpc_socket_error(xprt, sk->sk_socket, err);
2118071d
TM		 816 xprt_wake_pending_tasks(xprt, err);
817 out:
818 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 819}
820
fe315e76 821static void xs_reset_transport(struct sock_xprt *transport)
a246b010 822{
ee0ac0c2
CL		 823 struct socket *sock = transport->sock;
824 struct sock *sk = transport->inet;
6cc7e908 825 struct rpc_xprt *xprt = &transport->xprt;
a246b010 826
fe315e76
CL		 827 if (sk == NULL)
828 return;
9903cd1c 829
a246b010 830 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 831 transport->inet = NULL;
832 transport->sock = NULL;
a246b010 833
9903cd1c 834 sk->sk_user_data = NULL;
2a9e1cfa
TM		 835
836 xs_restore_old_callbacks(transport, sk);
a246b010 837 write_unlock_bh(&sk->sk_callback_lock);
6cc7e908 838 xs_sock_reset_connection_flags(xprt);
a246b010 839
6cc7e908 840 trace_rpc_socket_close(xprt, sock);
a246b010 841 sock_release(sock);
fe315e76
CL		 842}
843
844/**
845 * xs_close - close a socket
846 * @xprt: transport
847 *
848 * This is used when all requests are complete; ie, no DRC state remains
849 * on the server we want to save.
f75e6745
TM		 850 *
851 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
852 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 853 */
854static void xs_close(struct rpc_xprt *xprt)
855{
856 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
857
858 dprintk("RPC: xs_close xprt %p\n", xprt);
859
860 xs_reset_transport(transport);
61d0a8e6 861 xprt->reestablish_timeout = 0;
fe315e76 862
62da3b24 863 xprt_disconnect_done(xprt);
a246b010
CL		 864}
865
315f3812
KM		 866static void xs_xprt_free(struct rpc_xprt *xprt)
867{
868 xs_free_peer_addresses(xprt);
869 xprt_free(xprt);
870}
871
9903cd1c
CL		 872/**
873 * xs_destroy - prepare to shutdown a transport
874 * @xprt: doomed transport
875 *
876 */
877static void xs_destroy(struct rpc_xprt *xprt)
a246b010 878{
46121cf7 879 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 880
a1311d87 881 xs_close(xprt);
315f3812 882 xs_xprt_free(xprt);
a1311d87 883 module_put(THIS_MODULE);
a246b010
CL		 884}
885
176e21ee
CL		 886static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
887{
888 struct xdr_skb_reader desc = {
889 .skb = skb,
890 .offset = sizeof(rpc_fraghdr),
891 .count = skb->len - sizeof(rpc_fraghdr),
892 };
893
894 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
895 return -1;
896 if (desc.count)
897 return -1;
898 return 0;
899}
900
901/**
902 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
903 * @sk: socket with data to read
904 * @len: how much data to read
905 *
906 * Currently this assumes we can read the whole reply in a single gulp.
907 */
676d2369 908static void xs_local_data_ready(struct sock *sk)
176e21ee
CL		 909{
910 struct rpc_task *task;
911 struct rpc_xprt *xprt;
912 struct rpc_rqst *rovr;
913 struct sk_buff *skb;
914 int err, repsize, copied;
915 u32 _xid;
916 __be32 *xp;
917
918 read_lock_bh(&sk->sk_callback_lock);
919 dprintk("RPC: %s...\n", __func__);
920 xprt = xprt_from_sock(sk);
921 if (xprt == NULL)
922 goto out;
923
924 skb = skb_recv_datagram(sk, 0, 1, &err);
925 if (skb == NULL)
926 goto out;
927
176e21ee
CL		 928 repsize = skb->len - sizeof(rpc_fraghdr);
929 if (repsize < 4) {
930 dprintk("RPC: impossible RPC reply size %d\n", repsize);
931 goto dropit;
932 }
933
934 /* Copy the XID from the skb... */
935 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
936 if (xp == NULL)
937 goto dropit;
938
939 /* Look up and lock the request corresponding to the given XID */
940 spin_lock(&xprt->transport_lock);
941 rovr = xprt_lookup_rqst(xprt, *xp);
942 if (!rovr)
943 goto out_unlock;
944 task = rovr->rq_task;
945
946 copied = rovr->rq_private_buf.buflen;
947 if (copied > repsize)
948 copied = repsize;
949
950 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
951 dprintk("RPC: sk_buff copy failed\n");
952 goto out_unlock;
953 }
954
955 xprt_complete_rqst(task, copied);
956
957 out_unlock:
958 spin_unlock(&xprt->transport_lock);
959 dropit:
960 skb_free_datagram(sk, skb);
961 out:
962 read_unlock_bh(&sk->sk_callback_lock);
963}
964
9903cd1c
CL		 965/**
966 * xs_udp_data_ready - "data ready" callback for UDP sockets
967 * @sk: socket with data to read
968 * @len: how much data to read
969 *
a246b010 970 */
676d2369 971static void xs_udp_data_ready(struct sock *sk)
a246b010 972{
9903cd1c
CL		 973 struct rpc_task *task;
974 struct rpc_xprt *xprt;
a246b010 975 struct rpc_rqst *rovr;
9903cd1c 976 struct sk_buff *skb;
a246b010 977 int err, repsize, copied;
d8ed029d
AD		 978 u32 _xid;
979 __be32 *xp;
a246b010 980
f064af1e 981 read_lock_bh(&sk->sk_callback_lock);
46121cf7 982 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 983 if (!(xprt = xprt_from_sock(sk)))
a246b010 984 goto out;
a246b010
CL		 985
986 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
987 goto out;
988
a246b010
CL		 989 repsize = skb->len - sizeof(struct udphdr);
990 if (repsize < 4) {
46121cf7 991 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 992 goto dropit;
993 }
994
995 /* Copy the XID from the skb... */
996 xp = skb_header_pointer(skb, sizeof(struct udphdr),
997 sizeof(_xid), &_xid);
998 if (xp == NULL)
999 goto dropit;
1000
1001 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 1002 spin_lock(&xprt->transport_lock);
a246b010
CL		 1003 rovr = xprt_lookup_rqst(xprt, *xp);
1004 if (!rovr)
1005 goto out_unlock;
1006 task = rovr->rq_task;
1007
a246b010
CL		 1008 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1009 copied = repsize;
1010
1011 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1012 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1013 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1014 goto out_unlock;
1781f7f5
HX		 1015 }
1016
1017 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1018
6a24dfb6 1019 xprt_adjust_cwnd(xprt, task, copied);
1570c1e4 1020 xprt_complete_rqst(task, copied);
a246b010
CL		 1021
1022 out_unlock:
4a0f8c04 1023 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1024 dropit:
1025 skb_free_datagram(sk, skb);
1026 out:
f064af1e 1027 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1028}
1029
a519fc7a
TM		 1030/*
1031 * Helper function to force a TCP close if the server is sending
1032 * junk and/or it has put us in CLOSE_WAIT
1033 */
1034static void xs_tcp_force_close(struct rpc_xprt *xprt)
1035{
a519fc7a
TM		 1036 xprt_force_disconnect(xprt);
1037}
1038
dd456471 1039static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1040{
51971139 1041 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1042 size_t len, used;
1043 char *p;
1044
51971139
CL		 1045 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1046 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1047 used = xdr_skb_read_bits(desc, p, len);
51971139 1048 transport->tcp_offset += used;
a246b010
CL		 1049 if (used != len)
1050 return;
808012fb 1051
51971139
CL		 1052 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1053 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1054 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1055 else
e136d092 1056 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1057 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1058
e136d092 1059 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1060 transport->tcp_offset = 0;
808012fb 1061
a246b010 1062 /* Sanity check of the record length */
18dca02a 1063 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1064 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1065 xs_tcp_force_close(xprt);
9903cd1c 1066 return;
a246b010 1067 }
46121cf7 1068 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1069 transport->tcp_reclen);
a246b010
CL		 1070}
1071
51971139 1072static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1073{
51971139 1074 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1075 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1076 transport->tcp_offset = 0;
e136d092
CL		 1077 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1078 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1079 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1080 transport->tcp_copied = 0;
a246b010
CL		 1081 }
1082 }
1083}
1084
dd456471 1085static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1086{
1087 size_t len, used;
1088 char *p;
1089
51971139 1090 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1091 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1092 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1093 used = xdr_skb_read_bits(desc, p, len);
51971139 1094 transport->tcp_offset += used;
a246b010
CL		 1095 if (used != len)
1096 return;
e136d092 1097 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1098 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1099 transport->tcp_copied = 4;
18dca02a
RL		 1100 dprintk("RPC: reading %s XID %08x\n",
1101 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1102 : "request with",
51971139
CL		 1103 ntohl(transport->tcp_xid));
1104 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1105}
1106
18dca02a
RL		 1107static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1108 struct xdr_skb_reader *desc)
a246b010 1109{
18dca02a
RL		 1110 size_t len, used;
1111 u32 offset;
b76ce561 1112 char *p;
18dca02a
RL		 1113
1114 /*
1115 * We want transport->tcp_offset to be 8 at the end of this routine
1116 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1117 * When this function is called for the first time,
1118 * transport->tcp_offset is 4 (after having already read the xid).
1119 */
1120 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1121 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1122 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1123 p = ((char *) &transport->tcp_calldir) + offset;
1124 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1125 transport->tcp_offset += used;
1126 if (used != len)
1127 return;
f4a2e418 1128 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1129 /*
1130 * We don't yet have the XDR buffer, so we will write the calldir
1131 * out after we get the buffer from the 'struct rpc_rqst'
1132 */
b76ce561
TM		 1133 switch (ntohl(transport->tcp_calldir)) {
1134 case RPC_REPLY:
1135 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1136 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1137 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1138 break;
1139 case RPC_CALL:
1140 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1141 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1142 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1143 break;
1144 default:
1145 dprintk("RPC: invalid request message type\n");
a519fc7a 1146 xs_tcp_force_close(&transport->xprt);
b76ce561 1147 }
18dca02a
RL		 1148 xs_tcp_check_fraghdr(transport);
1149}
1150
44b98efd
RL		 1151static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1152 struct xdr_skb_reader *desc,
1153 struct rpc_rqst *req)
a246b010 1154{
44b98efd
RL		 1155 struct sock_xprt *transport =
1156 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1157 struct xdr_buf *rcvbuf;
1158 size_t len;
1159 ssize_t r;
1160
a246b010 1161 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1162
1163 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1164 /*
1165 * Save the RPC direction in the XDR buffer
1166 */
f4a2e418 1167 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1168 &transport->tcp_calldir,
1169 sizeof(transport->tcp_calldir));
1170 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1171 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1172 }
1173
a246b010 1174 len = desc->count;
51971139 1175 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1176 struct xdr_skb_reader my_desc;
a246b010 1177
51971139 1178 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1179 memcpy(&my_desc, desc, sizeof(my_desc));
1180 my_desc.count = len;
51971139 1181 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1182 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1183 desc->count -= r;
1184 desc->offset += r;
1185 } else
51971139 1186 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1187 desc, xdr_skb_read_bits);
a246b010
CL		 1188
1189 if (r > 0) {
51971139
CL		 1190 transport->tcp_copied += r;
1191 transport->tcp_offset += r;
a246b010
CL		 1192 }
1193 if (r != len) {
1194 /* Error when copying to the receive buffer,
1195 * usually because we weren't able to allocate
1196 * additional buffer pages. All we can do now
e136d092 1197 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1198 * will not receive any additional updates,
1199 * and time out.
1200 * Any remaining data from this record will
1201 * be discarded.
1202 */
e136d092 1203 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1204 dprintk("RPC: XID %08x truncated request\n",
51971139 1205 ntohl(transport->tcp_xid));
46121cf7
CL		 1206 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1207 "tcp_offset = %u, tcp_reclen = %u\n",
1208 xprt, transport->tcp_copied,
1209 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1210 return;
a246b010
CL		 1211 }
1212
46121cf7 1213 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1214 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1215 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1216 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1217 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1218
1219 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1220 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1221 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1222 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1223 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1224 }
44b98efd
RL		 1225}
1226
1227/*
1228 * Finds the request corresponding to the RPC xid and invokes the common
1229 * tcp read code to read the data.
1230 */
1231static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1232 struct xdr_skb_reader *desc)
1233{
1234 struct sock_xprt *transport =
1235 container_of(xprt, struct sock_xprt, xprt);
1236 struct rpc_rqst *req;
1237
1238 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1239
1240 /* Find and lock the request corresponding to this xid */
1241 spin_lock(&xprt->transport_lock);
1242 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1243 if (!req) {
1244 dprintk("RPC: XID %08x request not found!\n",
1245 ntohl(transport->tcp_xid));
1246 spin_unlock(&xprt->transport_lock);
1247 return -1;
1248 }
1249
1250 xs_tcp_read_common(xprt, desc, req);
1251
e136d092 1252 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1253 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1254
4a0f8c04 1255 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1256 return 0;
1257}
1258
9e00abc3 1259#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1260/*
1261 * Obtains an rpc_rqst previously allocated and invokes the common
1262 * tcp read code to read the data. The result is placed in the callback
1263 * queue.
1264 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1265 * connection and return -1.
1266 */
2ea24497 1267static int xs_tcp_read_callback(struct rpc_xprt *xprt,
44b98efd
RL		 1268 struct xdr_skb_reader *desc)
1269{
1270 struct sock_xprt *transport =
1271 container_of(xprt, struct sock_xprt, xprt);
1272 struct rpc_rqst *req;
1273
2ea24497
TM		 1274 /* Look up and lock the request corresponding to the given XID */
1275 spin_lock(&xprt->transport_lock);
1276 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
44b98efd 1277 if (req == NULL) {
2ea24497 1278 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1279 printk(KERN_WARNING "Callback slot table overflowed\n");
1280 xprt_force_disconnect(xprt);
1281 return -1;
1282 }
1283
44b98efd
RL		 1284 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1285 xs_tcp_read_common(xprt, desc, req);
1286
2ea24497
TM		 1287 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1288 xprt_complete_bc_request(req, transport->tcp_copied);
1289 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1290
1291 return 0;
1292}
1293
1294static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1295 struct xdr_skb_reader *desc)
1296{
1297 struct sock_xprt *transport =
1298 container_of(xprt, struct sock_xprt, xprt);
1299
1300 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1301 xs_tcp_read_reply(xprt, desc) :
1302 xs_tcp_read_callback(xprt, desc);
1303}
1304#else
1305static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1306 struct xdr_skb_reader *desc)
1307{
1308 return xs_tcp_read_reply(xprt, desc);
1309}
9e00abc3 1310#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1311
1312/*
1313 * Read data off the transport. This can be either an RPC_CALL or an
1314 * RPC_REPLY. Relay the processing to helper functions.
1315 */
1316static void xs_tcp_read_data(struct rpc_xprt *xprt,
1317 struct xdr_skb_reader *desc)
1318{
1319 struct sock_xprt *transport =
1320 container_of(xprt, struct sock_xprt, xprt);
1321
1322 if (_xs_tcp_read_data(xprt, desc) == 0)
1323 xs_tcp_check_fraghdr(transport);
1324 else {
1325 /*
1326 * The transport_lock protects the request handling.
1327 * There's no need to hold it to update the tcp_flags.
1328 */
1329 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1330 }
a246b010
CL		 1331}
1332
dd456471 1333static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1334{
1335 size_t len;
1336
51971139 1337 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1338 if (len > desc->count)
1339 len = desc->count;
1340 desc->count -= len;
1341 desc->offset += len;
51971139 1342 transport->tcp_offset += len;
46121cf7 1343 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1344 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1345}
1346
9903cd1c 1347static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1348{
1349 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1350 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1351 struct xdr_skb_reader desc = {
a246b010
CL		 1352 .skb = skb,
1353 .offset = offset,
1354 .count = len,
9903cd1c 1355 };
a246b010 1356
46121cf7 1357 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010 1358 do {
1a867a08 1359 trace_xs_tcp_data_recv(transport);
a246b010
CL		 1360 /* Read in a new fragment marker if necessary */
1361 /* Can we ever really expect to get completely empty fragments? */
e136d092 1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1363 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1364 continue;
1365 }
1366 /* Read in the xid if necessary */
e136d092 1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1368 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1369 continue;
1370 }
18dca02a 1371 /* Read in the call/reply flag */
f4a2e418 1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1373 xs_tcp_read_calldir(transport, &desc);
1374 continue;
1375 }
a246b010 1376 /* Read in the request data */
e136d092 1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1378 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1379 continue;
1380 }
1381 /* Skip over any trailing bytes on short reads */
51971139 1382 xs_tcp_read_discard(transport, &desc);
a246b010 1383 } while (desc.count);
1a867a08 1384 trace_xs_tcp_data_recv(transport);
46121cf7 1385 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1386 return len - desc.count;
1387}
1388
9903cd1c
CL		 1389/**
1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1391 * @sk: socket with data to read
1392 * @bytes: how much data to read
1393 *
1394 */
676d2369 1395static void xs_tcp_data_ready(struct sock *sk)
a246b010
CL		 1396{
1397 struct rpc_xprt *xprt;
1398 read_descriptor_t rd_desc;
ff2d7db8 1399 int read;
3705ad64 1400 unsigned long total = 0;
a246b010 1401
46121cf7
CL		 1402 dprintk("RPC: xs_tcp_data_ready...\n");
1403
f064af1e 1404 read_lock_bh(&sk->sk_callback_lock);
3705ad64
JL		 1405 if (!(xprt = xprt_from_sock(sk))) {
1406 read = 0;
a246b010 1407 goto out;
3705ad64 1408 }
61d0a8e6
NB		 1409 /* Any data means we had a useful conversation, so
1410 * the we don't need to delay the next reconnect
1411 */
1412 if (xprt->reestablish_timeout)
1413 xprt->reestablish_timeout = 0;
1414
9903cd1c 1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1416 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1417 do {
1418 rd_desc.count = 65536;
1419 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
3705ad64
JL		 1420 if (read > 0)
1421 total += read;
ff2d7db8 1422 } while (read > 0);
a246b010 1423out:
3705ad64 1424 trace_xs_tcp_data_ready(xprt, read, total);
f064af1e 1425 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1426}
1427
9903cd1c
CL		 1428/**
1429 * xs_tcp_state_change - callback to handle TCP socket state changes
1430 * @sk: socket whose state has changed
1431 *
1432 */
1433static void xs_tcp_state_change(struct sock *sk)
a246b010 1434{
9903cd1c 1435 struct rpc_xprt *xprt;
a246b010 1436
f064af1e 1437 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1438 if (!(xprt = xprt_from_sock(sk)))
1439 goto out;
46121cf7 1440 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1441 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1442 sk->sk_state, xprt_connected(xprt),
1443 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1444 sock_flag(sk, SOCK_ZAPPED),
1445 sk->sk_shutdown);
a246b010 1446
40b5ea0c 1447 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1448 switch (sk->sk_state) {
1449 case TCP_ESTABLISHED:
f064af1e 1450 spin_lock(&xprt->transport_lock);
a246b010 1451 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1452 struct sock_xprt *transport = container_of(xprt,
1453 struct sock_xprt, xprt);
1454
a246b010 1455 /* Reset TCP record info */
51971139
CL		 1456 transport->tcp_offset = 0;
1457 transport->tcp_reclen = 0;
1458 transport->tcp_copied = 0;
e136d092
CL		 1459 transport->tcp_flags =
1460 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
8b71798c 1461 xprt->connect_cookie++;
51971139 1462
2a491991 1463 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1464 }
f064af1e 1465 spin_unlock(&xprt->transport_lock);
a246b010 1466 break;
3b948ae5
TM		 1467 case TCP_FIN_WAIT1:
1468 /* The client initiated a shutdown of the socket */
7c1d71cf 1469 xprt->connect_cookie++;
663b8858 1470 xprt->reestablish_timeout = 0;
3b948ae5 1471 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1472 smp_mb__before_atomic();
3b948ae5 1473 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1474 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
4e857c58 1475 smp_mb__after_atomic();
a246b010 1476 break;
632e3bdc 1477 case TCP_CLOSE_WAIT:
3b948ae5 1478 /* The server initiated a shutdown of the socket */
7c1d71cf 1479 xprt->connect_cookie++;
d0bea455 1480 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1481 xs_tcp_force_close(xprt);
663b8858
TM		 1482 case TCP_CLOSING:
1483 /*
1484 * If the server closed down the connection, make sure that
1485 * we back off before reconnecting
1486 */
1487 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1488 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1489 break;
1490 case TCP_LAST_ACK:
670f9457 1491 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1492 smp_mb__before_atomic();
3b948ae5 1493 clear_bit(XPRT_CONNECTED, &xprt->state);
4e857c58 1494 smp_mb__after_atomic();
3b948ae5
TM		 1495 break;
1496 case TCP_CLOSE:
7d1e8255 1497 xs_sock_mark_closed(xprt);
a246b010
CL		 1498 }
1499 out:
f064af1e 1500 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1501}
1502
1f0fa154
IJ		 1503static void xs_write_space(struct sock *sk)
1504{
1505 struct socket *sock;
1506 struct rpc_xprt *xprt;
1507
1508 if (unlikely(!(sock = sk->sk_socket)))
1509 return;
1510 clear_bit(SOCK_NOSPACE, &sock->flags);
1511
1512 if (unlikely(!(xprt = xprt_from_sock(sk))))
1513 return;
1514 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1515 return;
1516
1517 xprt_write_space(xprt);
1518}
1519
9903cd1c 1520/**
c7b2cae8
CL		 1521 * xs_udp_write_space - callback invoked when socket buffer space
1522 * becomes available
9903cd1c
CL		 1523 * @sk: socket whose state has changed
1524 *
a246b010
CL		 1525 * Called when more output buffer space is available for this socket.
1526 * We try not to wake our writers until they can make "significant"
c7b2cae8 1527 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1528 * with a bunch of small requests.
1529 */
c7b2cae8 1530static void xs_udp_write_space(struct sock *sk)
a246b010 1531{
f064af1e 1532 read_lock_bh(&sk->sk_callback_lock);
a246b010 1533
c7b2cae8 1534 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1535 if (sock_writeable(sk))
1536 xs_write_space(sk);
a246b010 1537
f064af1e 1538 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1539}
a246b010 1540
c7b2cae8
CL		 1541/**
1542 * xs_tcp_write_space - callback invoked when socket buffer space
1543 * becomes available
1544 * @sk: socket whose state has changed
1545 *
1546 * Called when more output buffer space is available for this socket.
1547 * We try not to wake our writers until they can make "significant"
1548 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1549 * with a bunch of small requests.
1550 */
1551static void xs_tcp_write_space(struct sock *sk)
1552{
f064af1e 1553 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1554
1555 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1556 if (sk_stream_is_writeable(sk))
1f0fa154 1557 xs_write_space(sk);
b6ddf64f 1558
f064af1e 1559 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1560}
1561
470056c2 1562static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1563{
ee0ac0c2
CL		 1564 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1565 struct sock *sk = transport->inet;
a246b010 1566
7c6e066e 1567 if (transport->rcvsize) {
a246b010 1568 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1569 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1570 }
7c6e066e 1571 if (transport->sndsize) {
a246b010 1572 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1573 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1574 sk->sk_write_space(sk);
1575 }
1576}
1577
43118c29 1578/**
470056c2 1579 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1580 * @xprt: generic transport
470056c2
CL		 1581 * @sndsize: requested size of send buffer, in bytes
1582 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1583 *
470056c2 1584 * Set socket send and receive buffer size limits.
43118c29 1585 */
470056c2 1586static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1587{
7c6e066e
CL		 1588 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1589
1590 transport->sndsize = 0;
470056c2 1591 if (sndsize)
7c6e066e
CL		 1592 transport->sndsize = sndsize + 1024;
1593 transport->rcvsize = 0;
470056c2 1594 if (rcvsize)
7c6e066e 1595 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1596
1597 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1598}
1599
46c0ee8b
CL		 1600/**
1601 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1602 * @task: task that timed out
1603 *
1604 * Adjust the congestion window after a retransmit timeout has occurred.
1605 */
6a24dfb6 1606static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1607{
6a24dfb6 1608 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
46c0ee8b
CL		 1609}
1610
b85d8806
CL		 1611static unsigned short xs_get_random_port(void)
1612{
1613 unsigned short range = xprt_max_resvport - xprt_min_resvport;
63862b5b 1614 unsigned short rand = (unsigned short) prandom_u32() % range;
b85d8806
CL		 1615 return rand + xprt_min_resvport;
1616}
1617
4dda9c8a
TM		 1618/**
1619 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1620 * @sock: socket
1621 *
1622 * Note that this function has to be called on all sockets that share the
1623 * same port, and it must be called before binding.
1624 */
1625static void xs_sock_set_reuseport(struct socket *sock)
1626{
402e23b4 1627 int opt = 1;
4dda9c8a 1628
402e23b4
TM		 1629 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1630 (char *)&opt, sizeof(opt));
4dda9c8a
TM		 1631}
1632
1633static unsigned short xs_sock_getport(struct socket *sock)
1634{
1635 struct sockaddr_storage buf;
1636 int buflen;
1637 unsigned short port = 0;
1638
1639 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1640 goto out;
1641 switch (buf.ss_family) {
1642 case AF_INET6:
1643 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1644 break;
1645 case AF_INET:
1646 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1647 }
1648out:
1649 return port;
1650}
1651
92200412
CL		 1652/**
1653 * xs_set_port - reset the port number in the remote endpoint address
1654 * @xprt: generic transport
1655 * @port: new port number
1656 *
1657 */
1658static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1659{
46121cf7 1660 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1661
9dc3b095
CL		 1662 rpc_set_port(xs_addr(xprt), port);
1663 xs_update_peer_port(xprt);
92200412
CL		 1664}
1665
4dda9c8a
TM		 1666static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1667{
1668 if (transport->srcport == 0)
1669 transport->srcport = xs_sock_getport(sock);
1670}
1671
5d4ec932 1672static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1673{
fbfffbd5 1674 unsigned short port = transport->srcport;
67a391d7
TM		 1675
1676 if (port == 0 && transport->xprt.resvport)
1677 port = xs_get_random_port();
1678 return port;
1679}
1680
baaf4e48 1681static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1682{
fbfffbd5
CL		 1683 if (transport->srcport != 0)
1684 transport->srcport = 0;
67a391d7
TM		 1685 if (!transport->xprt.resvport)
1686 return 0;
1687 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1688 return xprt_max_resvport;
1689 return --port;
1690}
beb59b68 1691static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1692{
beb59b68 1693 struct sockaddr_storage myaddr;
67a391d7 1694 int err, nloop = 0;
5d4ec932 1695 unsigned short port = xs_get_srcport(transport);
67a391d7 1696 unsigned short last;
a246b010 1697
0f7a622c
CP		 1698 /*
1699 * If we are asking for any ephemeral port (i.e. port == 0 &&
1700 * transport->xprt.resvport == 0), don't bind. Let the local
1701 * port selection happen implicitly when the socket is used
1702 * (for example at connect time).
1703 *
1704 * This ensures that we can continue to establish TCP
1705 * connections even when all local ephemeral ports are already
1706 * a part of some TCP connection. This makes no difference
1707 * for UDP sockets, but also doens't harm them.
1708 *
1709 * If we're asking for any reserved port (i.e. port == 0 &&
1710 * transport->xprt.resvport == 1) xs_get_srcport above will
1711 * ensure that port is non-zero and we will bind as needed.
1712 */
1713 if (port == 0)
1714 return 0;
1715
beb59b68 1716 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1717 do {
beb59b68
PE		 1718 rpc_set_port((struct sockaddr *)&myaddr, port);
1719 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1720 transport->xprt.addrlen);
a246b010 1721 if (err == 0) {
fbfffbd5 1722 transport->srcport = port;
d3bc9a1d 1723 break;
a246b010 1724 }
67a391d7 1725 last = port;
baaf4e48 1726 port = xs_next_srcport(transport, port);
67a391d7
TM		 1727 if (port > last)
1728 nloop++;
1729 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1730
4232e863 1731 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1732 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1733 &((struct sockaddr_in *)&myaddr)->sin_addr,
1734 port, err ? "failed" : "ok", err);
1735 else
1736 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1738 port, err ? "failed" : "ok", err);
a246b010
CL		 1739 return err;
1740}
1741
176e21ee
CL		 1742/*
1743 * We don't support autobind on AF_LOCAL sockets
1744 */
1745static void xs_local_rpcbind(struct rpc_task *task)
1746{
3dc0da27
TM		 1747 rcu_read_lock();
1748 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1749 rcu_read_unlock();
176e21ee
CL		 1750}
1751
1752static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1753{
1754}
beb59b68 1755
ed07536e
PZ		 1756#ifdef CONFIG_DEBUG_LOCK_ALLOC
1757static struct lock_class_key xs_key[2];
1758static struct lock_class_key xs_slock_key[2];
1759
176e21ee
CL		 1760static inline void xs_reclassify_socketu(struct socket *sock)
1761{
1762 struct sock *sk = sock->sk;
1763
176e21ee
CL		 1764 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1765 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1766}
1767
8945ee5e 1768static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1769{
1770 struct sock *sk = sock->sk;
8945ee5e 1771
8945ee5e
CL		 1772 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1773 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1774}
ed07536e 1775
8945ee5e
CL		 1776static inline void xs_reclassify_socket6(struct socket *sock)
1777{
1778 struct sock *sk = sock->sk;
ed07536e 1779
8945ee5e
CL		 1780 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1781 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1782}
6bc9638a
PE		 1783
1784static inline void xs_reclassify_socket(int family, struct socket *sock)
1785{
1b7a1819
WAA		 1786 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1787 if (sock_owned_by_user(sock->sk))
1788 return;
1789
4232e863 1790 switch (family) {
176e21ee
CL		 1791 case AF_LOCAL:
1792 xs_reclassify_socketu(sock);
1793 break;
4232e863 1794 case AF_INET:
6bc9638a 1795 xs_reclassify_socket4(sock);
4232e863
CL		 1796 break;
1797 case AF_INET6:
6bc9638a 1798 xs_reclassify_socket6(sock);
4232e863
CL		 1799 break;
1800 }
6bc9638a 1801}
ed07536e 1802#else
176e21ee
CL		 1803static inline void xs_reclassify_socketu(struct socket *sock)
1804{
1805}
1806
8945ee5e
CL		 1807static inline void xs_reclassify_socket4(struct socket *sock)
1808{
1809}
1810
1811static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1812{
1813}
6bc9638a
PE		 1814
1815static inline void xs_reclassify_socket(int family, struct socket *sock)
1816{
1817}
ed07536e
PZ		 1818#endif
1819
93dc41bd
N		 1820static void xs_dummy_setup_socket(struct work_struct *work)
1821{
1822}
1823
6bc9638a 1824static struct socket *xs_create_sock(struct rpc_xprt *xprt,
4dda9c8a
TM		 1825 struct sock_xprt *transport, int family, int type,
1826 int protocol, bool reuseport)
22f79326
PE		 1827{
1828 struct socket *sock;
1829 int err;
1830
6bc9638a 1831 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1832 if (err < 0) {
1833 dprintk("RPC: can't create %d transport socket (%d).\n",
1834 protocol, -err);
1835 goto out;
1836 }
6bc9638a 1837 xs_reclassify_socket(family, sock);
22f79326 1838
4dda9c8a
TM		 1839 if (reuseport)
1840 xs_sock_set_reuseport(sock);
1841
4cea288a
BH		 1842 err = xs_bind(transport, sock);
1843 if (err) {
22f79326
PE		 1844 sock_release(sock);
1845 goto out;
1846 }
1847
1848 return sock;
1849out:
1850 return ERR_PTR(err);
1851}
1852
176e21ee
CL		 1853static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1854 struct socket *sock)
1855{
1856 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1857 xprt);
1858
1859 if (!transport->inet) {
1860 struct sock *sk = sock->sk;
1861
1862 write_lock_bh(&sk->sk_callback_lock);
1863
1864 xs_save_old_callbacks(transport, sk);
1865
1866 sk->sk_user_data = xprt;
1867 sk->sk_data_ready = xs_local_data_ready;
1868 sk->sk_write_space = xs_udp_write_space;
2118071d 1869 sk->sk_error_report = xs_error_report;
176e21ee
CL		 1870 sk->sk_allocation = GFP_ATOMIC;
1871
1872 xprt_clear_connected(xprt);
1873
1874 /* Reset to new socket */
1875 transport->sock = sock;
1876 transport->inet = sk;
1877
1878 write_unlock_bh(&sk->sk_callback_lock);
1879 }
1880
1881 /* Tell the socket layer to start connecting... */
1882 xprt->stat.connect_count++;
1883 xprt->stat.connect_start = jiffies;
1884 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1885}
1886
1887/**
1888 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1889 * @xprt: RPC transport to connect
1890 * @transport: socket transport to connect
1891 * @create_sock: function to create a socket of the correct type
176e21ee 1892 */
dc107402 1893static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1894{
176e21ee
CL		 1895 struct rpc_xprt *xprt = &transport->xprt;
1896 struct socket *sock;
1897 int status = -EIO;
1898
176e21ee
CL		 1899 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1900 SOCK_STREAM, 0, &sock, 1);
1901 if (status < 0) {
1902 dprintk("RPC: can't create AF_LOCAL "
1903 "transport socket (%d).\n", -status);
1904 goto out;
1905 }
1906 xs_reclassify_socketu(sock);
1907
1908 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1910
1911 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 1912 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 1913 switch (status) {
1914 case 0:
1915 dprintk("RPC: xprt %p connected to %s\n",
1916 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1917 xprt_set_connected(xprt);
3601c4a9 1918 case -ENOBUFS:
176e21ee
CL		 1919 break;
1920 case -ENOENT:
1921 dprintk("RPC: xprt %p: socket %s does not exist\n",
1922 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1923 break;
4a20a988
TM		 1924 case -ECONNREFUSED:
1925 dprintk("RPC: xprt %p: connection refused for %s\n",
1926 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1927 break;
176e21ee
CL		 1928 default:
1929 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1930 __func__, -status,
1931 xprt->address_strings[RPC_DISPLAY_ADDR]);
1932 }
1933
1934out:
1935 xprt_clear_connecting(xprt);
1936 xprt_wake_pending_tasks(xprt, status);
dc107402
BF		 1937 return status;
1938}
1939
b6669737 1940static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1941{
dc107402
BF		 1942 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1943 int ret;
1944
1945 if (RPC_IS_ASYNC(task)) {
1946 /*
1947 * We want the AF_LOCAL connect to be resolved in the
1948 * filesystem namespace of the process making the rpc
1949 * call. Thus we connect synchronously.
1950 *
1951 * If we want to support asynchronous AF_LOCAL calls,
1952 * we'll need to figure out how to pass a namespace to
1953 * connect.
1954 */
1955 rpc_exit(task, -ENOTCONN);
1956 return;
1957 }
1958 ret = xs_local_setup_socket(transport);
1959 if (ret && !RPC_IS_SOFTCONN(task))
1960 msleep_interruptible(15000);
176e21ee
CL		 1961}
1962
a564b8f0
MG		 1963#ifdef CONFIG_SUNRPC_SWAP
1964static void xs_set_memalloc(struct rpc_xprt *xprt)
1965{
1966 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1967 xprt);
1968
1969 if (xprt->swapper)
1970 sk_set_memalloc(transport->inet);
1971}
1972
1973/**
1974 * xs_swapper - Tag this transport as being used for swap.
1975 * @xprt: transport to tag
1976 * @enable: enable/disable
1977 *
1978 */
1979int xs_swapper(struct rpc_xprt *xprt, int enable)
1980{
1981 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1982 xprt);
1983 int err = 0;
1984
1985 if (enable) {
1986 xprt->swapper++;
1987 xs_set_memalloc(xprt);
1988 } else if (xprt->swapper) {
1989 xprt->swapper--;
1990 sk_clear_memalloc(transport->inet);
1991 }
1992
1993 return err;
1994}
1995EXPORT_SYMBOL_GPL(xs_swapper);
1996#else
1997static void xs_set_memalloc(struct rpc_xprt *xprt)
1998{
1999}
2000#endif
2001
16be2d20
CL		 2002static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2003{
2004 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2005
2006 if (!transport->inet) {
2007 struct sock *sk = sock->sk;
2008
2009 write_lock_bh(&sk->sk_callback_lock);
2010
2a9e1cfa
TM		 2011 xs_save_old_callbacks(transport, sk);
2012
16be2d20 2013 sk->sk_user_data = xprt;
16be2d20
CL		 2014 sk->sk_data_ready = xs_udp_data_ready;
2015 sk->sk_write_space = xs_udp_write_space;
16be2d20
CL		 2016 sk->sk_allocation = GFP_ATOMIC;
2017
2018 xprt_set_connected(xprt);
2019
2020 /* Reset to new socket */
2021 transport->sock = sock;
2022 transport->inet = sk;
2023
a564b8f0
MG		 2024 xs_set_memalloc(xprt);
2025
16be2d20
CL		 2026 write_unlock_bh(&sk->sk_callback_lock);
2027 }
2028 xs_udp_do_set_buffer_size(xprt);
2029}
2030
8c14ff2a 2031static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2032{
34161db6
TM		 2033 struct sock_xprt *transport =
2034 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2035 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2036 struct socket *sock = transport->sock;
b65c0310 2037 int status = -EIO;
9903cd1c 2038
8c14ff2a 2039 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2040 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2041 IPPROTO_UDP, false);
b65c0310 2042 if (IS_ERR(sock))
b0d93ad5 2043 goto out;
68e220bd 2044
c740eff8
CL		 2045 dprintk("RPC: worker connecting xprt %p via %s to "
2046 "%s (port %s)\n", xprt,
2047 xprt->address_strings[RPC_DISPLAY_PROTO],
2048 xprt->address_strings[RPC_DISPLAY_ADDR],
2049 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2050
2051 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2052 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2053 status = 0;
2054out:
718ba5b8 2055 xprt_unlock_connect(xprt, transport);
b0d93ad5 2056 xprt_clear_connecting(xprt);
7d1e8255 2057 xprt_wake_pending_tasks(xprt, status);
a246b010
CL		 2058}
2059
16be2d20 2060static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2061{
16be2d20 2062 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2063 int ret = -ENOTCONN;
edb267a6 2064
ee0ac0c2 2065 if (!transport->inet) {
b0d93ad5 2066 struct sock *sk = sock->sk;
7f260e85
TM		 2067 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2068 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2069 unsigned int opt_on = 1;
2070
2071 /* TCP Keepalive options */
2072 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2073 (char *)&opt_on, sizeof(opt_on));
2074 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2075 (char *)&keepidle, sizeof(keepidle));
2076 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2077 (char *)&keepidle, sizeof(keepidle));
2078 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2079 (char *)&keepcnt, sizeof(keepcnt));
b0d93ad5
CL		 2080
2081 write_lock_bh(&sk->sk_callback_lock);
2082
2a9e1cfa
TM		 2083 xs_save_old_callbacks(transport, sk);
2084
b0d93ad5 2085 sk->sk_user_data = xprt;
b0d93ad5
CL		 2086 sk->sk_data_ready = xs_tcp_data_ready;
2087 sk->sk_state_change = xs_tcp_state_change;
2088 sk->sk_write_space = xs_tcp_write_space;
2118071d 2089 sk->sk_error_report = xs_error_report;
b079fa7b 2090 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2091
2092 /* socket options */
3167e12c 2093 sock_reset_flag(sk, SOCK_LINGER);
3167e12c 2094 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2095
2096 xprt_clear_connected(xprt);
2097
2098 /* Reset to new socket */
ee0ac0c2
CL		 2099 transport->sock = sock;
2100 transport->inet = sk;
b0d93ad5
CL		 2101
2102 write_unlock_bh(&sk->sk_callback_lock);
2103 }
2104
01d37c42 2105 if (!xprt_bound(xprt))
fe19a96b 2106 goto out;
01d37c42 2107
a564b8f0
MG		 2108 xs_set_memalloc(xprt);
2109
b0d93ad5 2110 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2111 xprt->stat.connect_count++;
2112 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2113 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2114 switch (ret) {
2115 case 0:
4dda9c8a 2116 xs_set_srcport(transport, sock);
fe19a96b
TM		 2117 case -EINPROGRESS:
2118 /* SYN_SENT! */
fe19a96b
TM		 2119 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2120 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2121 }
2122out:
2123 return ret;
16be2d20
CL		 2124}
2125
9903cd1c 2126/**
b61d59ff
TM		 2127 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2128 * @xprt: RPC transport to connect
2129 * @transport: socket transport to connect
2130 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2131 *
2132 * Invoked by a work queue tasklet.
a246b010 2133 */
cdd518d5 2134static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2135{
cdd518d5
PE		 2136 struct sock_xprt *transport =
2137 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2138 struct socket *sock = transport->sock;
a9f5f0f7 2139 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2140 int status = -EIO;
a246b010 2141
ee0ac0c2 2142 if (!sock) {
cdd518d5 2143 sock = xs_create_sock(xprt, transport,
4dda9c8a
TM		 2144 xs_addr(xprt)->sa_family, SOCK_STREAM,
2145 IPPROTO_TCP, true);
b61d59ff
TM		 2146 if (IS_ERR(sock)) {
2147 status = PTR_ERR(sock);
3167e12c
CL		 2148 goto out;
2149 }
7d1e8255 2150 }
a246b010 2151
c740eff8
CL		 2152 dprintk("RPC: worker connecting xprt %p via %s to "
2153 "%s (port %s)\n", xprt,
2154 xprt->address_strings[RPC_DISPLAY_PROTO],
2155 xprt->address_strings[RPC_DISPLAY_ADDR],
2156 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2157
16be2d20 2158 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2159 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2160 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2161 xprt, -status, xprt_connected(xprt),
2162 sock->sk->sk_state);
2a491991 2163 switch (status) {
f75e6745
TM		 2164 default:
2165 printk("%s: connect returned unhandled error %d\n",
2166 __func__, status);
2167 case -EADDRNOTAVAIL:
2168 /* We're probably in TIME_WAIT. Get rid of existing socket,
2169 * and retry
2170 */
a519fc7a 2171 xs_tcp_force_close(xprt);
88b5ed73 2172 break;
2a491991
TM		 2173 case 0:
2174 case -EINPROGRESS:
2175 case -EALREADY:
718ba5b8 2176 xprt_unlock_connect(xprt, transport);
7d1e8255
TM		 2177 xprt_clear_connecting(xprt);
2178 return;
9fcfe0c8
TM		 2179 case -EINVAL:
2180 /* Happens, for instance, if the user specified a link
2181 * local IPv6 address without a scope-id.
2182 */
3ed5e2a2
TM		 2183 case -ECONNREFUSED:
2184 case -ECONNRESET:
2185 case -ENETUNREACH:
3913c78c 2186 case -EADDRINUSE:
3601c4a9 2187 case -ENOBUFS:
3ed5e2a2 2188 /* retry with existing socket, after a delay */
4efdd92c 2189 xs_tcp_force_close(xprt);
9fcfe0c8 2190 goto out;
a246b010 2191 }
2a491991 2192 status = -EAGAIN;
a246b010 2193out:
718ba5b8 2194 xprt_unlock_connect(xprt, transport);
68e220bd 2195 xprt_clear_connecting(xprt);
7d1e8255 2196 xprt_wake_pending_tasks(xprt, status);
68e220bd 2197}
b0d93ad5 2198
9903cd1c
CL		 2199/**
2200 * xs_connect - connect a socket to a remote endpoint
1b092092 2201 * @xprt: pointer to transport structure
9903cd1c
CL		 2202 * @task: address of RPC task that manages state of connect request
2203 *
2204 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2205 *
2206 * UDP socket connects are synchronous, but we use a work queue anyway
2207 * to guarantee that even unprivileged user processes can set up a
2208 * socket on a privileged port.
2209 *
2210 * If a UDP socket connect fails, the delay behavior here prevents
2211 * retry floods (hard mounts).
9903cd1c 2212 */
1b092092 2213static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2214{
ee0ac0c2 2215 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2216
718ba5b8
TM		 2217 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2218
de84d890
TM		 2219 /* Start by resetting any existing state */
2220 xs_reset_transport(transport);
2221
09a21c41 2222 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2223 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2224 "seconds\n",
03bf4b70 2225 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2226 queue_delayed_work(rpciod_workqueue,
2227 &transport->connect_worker,
2228 xprt->reestablish_timeout);
03bf4b70 2229 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2230 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2231 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2232 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2233 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2234 } else {
46121cf7 2235 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2236 queue_delayed_work(rpciod_workqueue,
2237 &transport->connect_worker, 0);
a246b010
CL		 2238 }
2239}
2240
176e21ee
CL		 2241/**
2242 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2243 * @xprt: rpc_xprt struct containing statistics
2244 * @seq: output file
2245 *
2246 */
2247static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2248{
2249 long idle_time = 0;
2250
2251 if (xprt_connected(xprt))
2252 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2253
2254 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2255 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2256 xprt->stat.bind_count,
2257 xprt->stat.connect_count,
2258 xprt->stat.connect_time,
2259 idle_time,
2260 xprt->stat.sends,
2261 xprt->stat.recvs,
2262 xprt->stat.bad_xids,
2263 xprt->stat.req_u,
15a45206
AA		 2264 xprt->stat.bklog_u,
2265 xprt->stat.max_slots,
2266 xprt->stat.sending_u,
2267 xprt->stat.pending_u);
176e21ee
CL		 2268}
2269
262ca07d
CL		 2270/**
2271 * xs_udp_print_stats - display UDP socket-specifc stats
2272 * @xprt: rpc_xprt struct containing statistics
2273 * @seq: output file
2274 *
2275 */
2276static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2277{
c8475461
CL		 2278 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2279
15a45206
AA		 2280 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2281 "%lu %llu %llu\n",
fbfffbd5 2282 transport->srcport,
262ca07d
CL		 2283 xprt->stat.bind_count,
2284 xprt->stat.sends,
2285 xprt->stat.recvs,
2286 xprt->stat.bad_xids,
2287 xprt->stat.req_u,
15a45206
AA		 2288 xprt->stat.bklog_u,
2289 xprt->stat.max_slots,
2290 xprt->stat.sending_u,
2291 xprt->stat.pending_u);
262ca07d
CL		 2292}
2293
2294/**
2295 * xs_tcp_print_stats - display TCP socket-specifc stats
2296 * @xprt: rpc_xprt struct containing statistics
2297 * @seq: output file
2298 *
2299 */
2300static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2301{
c8475461 2302 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2303 long idle_time = 0;
2304
2305 if (xprt_connected(xprt))
2306 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2307
15a45206
AA		 2308 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2309 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2310 transport->srcport,
262ca07d
CL		 2311 xprt->stat.bind_count,
2312 xprt->stat.connect_count,
2313 xprt->stat.connect_time,
2314 idle_time,
2315 xprt->stat.sends,
2316 xprt->stat.recvs,
2317 xprt->stat.bad_xids,
2318 xprt->stat.req_u,
15a45206
AA		 2319 xprt->stat.bklog_u,
2320 xprt->stat.max_slots,
2321 xprt->stat.sending_u,
2322 xprt->stat.pending_u);
262ca07d
CL		 2323}
2324
4cfc7e60
RI		 2325/*
2326 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2327 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2328 * to use the server side send routines.
2329 */
5a51f13a 2330static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2331{
2332 struct page *page;
2333 struct rpc_buffer *buf;
2334
b8a13d03
WAA		 2335 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2336 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2337 return NULL;
4cfc7e60 2338
b8a13d03 2339 page = alloc_page(GFP_KERNEL);
4cfc7e60
RI		 2340 if (!page)
2341 return NULL;
2342
2343 buf = page_address(page);
2344 buf->len = PAGE_SIZE;
2345
2346 return buf->data;
2347}
2348
2349/*
2350 * Free the space allocated in the bc_alloc routine
2351 */
5a51f13a 2352static void bc_free(void *buffer)
4cfc7e60
RI		 2353{
2354 struct rpc_buffer *buf;
2355
2356 if (!buffer)
2357 return;
2358
2359 buf = container_of(buffer, struct rpc_buffer, data);
2360 free_page((unsigned long)buf);
2361}
2362
2363/*
2364 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2365 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2366 */
2367static int bc_sendto(struct rpc_rqst *req)
2368{
2369 int len;
2370 struct xdr_buf *xbufp = &req->rq_snd_buf;
2371 struct rpc_xprt *xprt = req->rq_xprt;
2372 struct sock_xprt *transport =
2373 container_of(xprt, struct sock_xprt, xprt);
2374 struct socket *sock = transport->sock;
2375 unsigned long headoff;
2376 unsigned long tailoff;
2377
61677eee 2378 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2379
2380 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2381 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2382 len = svc_send_common(sock, xbufp,
2383 virt_to_page(xbufp->head[0].iov_base), headoff,
2384 xbufp->tail[0].iov_base, tailoff);
2385
2386 if (len != xbufp->len) {
2387 printk(KERN_NOTICE "Error sending entire callback!\n");
2388 len = -EAGAIN;
2389 }
2390
2391 return len;
2392}
2393
2394/*
2395 * The send routine. Borrows from svc_send
2396 */
2397static int bc_send_request(struct rpc_task *task)
2398{
2399 struct rpc_rqst *req = task->tk_rqstp;
2400 struct svc_xprt *xprt;
4cfc7e60
RI		 2401 u32 len;
2402
2403 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2404 /*
2405 * Get the server socket associated with this callback xprt
2406 */
2407 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2408
2409 /*
2410 * Grab the mutex to serialize data as the connection is shared
2411 * with the fore channel
2412 */
2413 if (!mutex_trylock(&xprt->xpt_mutex)) {
2414 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2415 if (!mutex_trylock(&xprt->xpt_mutex))
2416 return -EAGAIN;
2417 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2418 }
2419 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2420 len = -ENOTCONN;
2421 else
2422 len = bc_sendto(req);
2423 mutex_unlock(&xprt->xpt_mutex);
2424
2425 if (len > 0)
2426 len = 0;
2427
2428 return len;
2429}
2430
2431/*
2432 * The close routine. Since this is client initiated, we do nothing
2433 */
2434
2435static void bc_close(struct rpc_xprt *xprt)
2436{
4cfc7e60
RI		 2437}
2438
2439/*
2440 * The xprt destroy routine. Again, because this connection is client
2441 * initiated, we do nothing
2442 */
2443
2444static void bc_destroy(struct rpc_xprt *xprt)
2445{
47f72efa
KM		 2446 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2447
2448 xs_xprt_free(xprt);
2449 module_put(THIS_MODULE);
4cfc7e60
RI		 2450}
2451
176e21ee
CL		 2452static struct rpc_xprt_ops xs_local_ops = {
2453 .reserve_xprt = xprt_reserve_xprt,
2454 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2455 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2456 .rpcbind = xs_local_rpcbind,
2457 .set_port = xs_local_set_port,
dc107402 2458 .connect = xs_local_connect,
176e21ee
CL		 2459 .buf_alloc = rpc_malloc,
2460 .buf_free = rpc_free,
2461 .send_request = xs_local_send_request,
2462 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2463 .close = xs_close,
a1311d87 2464 .destroy = xs_destroy,
176e21ee
CL		 2465 .print_stats = xs_local_print_stats,
2466};
2467
262965f5 2468static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2469 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2470 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2471 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2472 .alloc_slot = xprt_alloc_slot,
45160d62 2473 .rpcbind = rpcb_getport_async,
92200412 2474 .set_port = xs_set_port,
262965f5 2475 .connect = xs_connect,
02107148
CL		 2476 .buf_alloc = rpc_malloc,
2477 .buf_free = rpc_free,
262965f5 2478 .send_request = xs_udp_send_request,
fe3aca29 2479 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2480 .timer = xs_udp_timer,
a58dd398 2481 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2482 .close = xs_close,
2483 .destroy = xs_destroy,
262ca07d 2484 .print_stats = xs_udp_print_stats,
262965f5
CL		 2485};
2486
2487static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2488 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2489 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2490 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2491 .rpcbind = rpcb_getport_async,
92200412 2492 .set_port = xs_set_port,
0b9e7943 2493 .connect = xs_connect,
02107148
CL		 2494 .buf_alloc = rpc_malloc,
2495 .buf_free = rpc_free,
262965f5 2496 .send_request = xs_tcp_send_request,
fe3aca29 2497 .set_retrans_timeout = xprt_set_retrans_timeout_def,
c627d31b 2498 .close = xs_tcp_shutdown,
9903cd1c 2499 .destroy = xs_destroy,
262ca07d 2500 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2501};
2502
4cfc7e60
RI		 2503/*
2504 * The rpc_xprt_ops for the server backchannel
2505 */
2506
2507static struct rpc_xprt_ops bc_tcp_ops = {
2508 .reserve_xprt = xprt_reserve_xprt,
2509 .release_xprt = xprt_release_xprt,
84e28a30 2510 .alloc_slot = xprt_alloc_slot,
4cfc7e60
RI		 2511 .buf_alloc = bc_malloc,
2512 .buf_free = bc_free,
2513 .send_request = bc_send_request,
2514 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2515 .close = bc_close,
2516 .destroy = bc_destroy,
2517 .print_stats = xs_tcp_print_stats,
2518};
2519
92476850
CL		 2520static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2521{
2522 static const struct sockaddr_in sin = {
2523 .sin_family = AF_INET,
2524 .sin_addr.s_addr = htonl(INADDR_ANY),
2525 };
2526 static const struct sockaddr_in6 sin6 = {
2527 .sin6_family = AF_INET6,
2528 .sin6_addr = IN6ADDR_ANY_INIT,
2529 };
2530
2531 switch (family) {
176e21ee
CL		 2532 case AF_LOCAL:
2533 break;
92476850
CL		 2534 case AF_INET:
2535 memcpy(sap, &sin, sizeof(sin));
2536 break;
2537 case AF_INET6:
2538 memcpy(sap, &sin6, sizeof(sin6));
2539 break;
2540 default:
2541 dprintk("RPC: %s: Bad address family\n", __func__);
2542 return -EAFNOSUPPORT;
2543 }
2544 return 0;
2545}
2546
3c341b0b 2547static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2548 unsigned int slot_table_size,
2549 unsigned int max_slot_table_size)
c8541ecd
CL		 2550{
2551 struct rpc_xprt *xprt;
ffc2e518 2552 struct sock_xprt *new;
c8541ecd 2553
96802a09 2554 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2555 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2556 return ERR_PTR(-EBADF);
2557 }
2558
d9ba131d
TM		 2559 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2560 max_slot_table_size);
bd1722d4 2561 if (xprt == NULL) {
46121cf7
CL		 2562 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2563 "rpc_xprt\n");
c8541ecd
CL		 2564 return ERR_PTR(-ENOMEM);
2565 }
c8541ecd 2566
bd1722d4 2567 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2568 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2569 xprt->addrlen = args->addrlen;
d3bc9a1d 2570 if (args->srcaddr)
fbfffbd5 2571 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2572 else {
2573 int err;
2574 err = xs_init_anyaddr(args->dstaddr->sa_family,
2575 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2576 if (err != 0) {
2577 xprt_free(xprt);
92476850 2578 return ERR_PTR(err);
2aa13531 2579 }
92476850 2580 }
c8541ecd
CL		 2581
2582 return xprt;
2583}
2584
176e21ee
CL		 2585static const struct rpc_timeout xs_local_default_timeout = {
2586 .to_initval = 10 * HZ,
2587 .to_maxval = 10 * HZ,
2588 .to_retries = 2,
2589};
2590
2591/**
2592 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2593 * @args: rpc transport creation arguments
2594 *
2595 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2596 */
2597static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2598{
2599 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2600 struct sock_xprt *transport;
2601 struct rpc_xprt *xprt;
2602 struct rpc_xprt *ret;
2603
d9ba131d
TM		 2604 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2605 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2606 if (IS_ERR(xprt))
2607 return xprt;
2608 transport = container_of(xprt, struct sock_xprt, xprt);
2609
2610 xprt->prot = 0;
2611 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2612 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2613
2614 xprt->bind_timeout = XS_BIND_TO;
2615 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2616 xprt->idle_timeout = XS_IDLE_DISC_TO;
2617
2618 xprt->ops = &xs_local_ops;
2619 xprt->timeout = &xs_local_default_timeout;
2620
93dc41bd
N		 2621 INIT_DELAYED_WORK(&transport->connect_worker,
2622 xs_dummy_setup_socket);
2623
176e21ee
CL		 2624 switch (sun->sun_family) {
2625 case AF_LOCAL:
2626 if (sun->sun_path[0] != '/') {
2627 dprintk("RPC: bad AF_LOCAL address: %s\n",
2628 sun->sun_path);
2629 ret = ERR_PTR(-EINVAL);
2630 goto out_err;
2631 }
2632 xprt_set_bound(xprt);
176e21ee 2633 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2634 ret = ERR_PTR(xs_local_setup_socket(transport));
2635 if (ret)
2636 goto out_err;
176e21ee
CL		 2637 break;
2638 default:
2639 ret = ERR_PTR(-EAFNOSUPPORT);
2640 goto out_err;
2641 }
2642
2643 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2644 xprt->address_strings[RPC_DISPLAY_ADDR]);
2645
2646 if (try_module_get(THIS_MODULE))
2647 return xprt;
2648 ret = ERR_PTR(-EINVAL);
2649out_err:
315f3812 2650 xs_xprt_free(xprt);
176e21ee
CL		 2651 return ret;
2652}
2653
2881ae74
TM		 2654static const struct rpc_timeout xs_udp_default_timeout = {
2655 .to_initval = 5 * HZ,
2656 .to_maxval = 30 * HZ,
2657 .to_increment = 5 * HZ,
2658 .to_retries = 5,
2659};
2660
9903cd1c
CL		 2661/**
2662 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2663 * @args: rpc transport creation arguments
9903cd1c
CL		 2664 *
2665 */
483066d6 2666static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2667{
8f9d5b1a 2668 struct sockaddr *addr = args->dstaddr;
c8541ecd 2669 struct rpc_xprt *xprt;
c8475461 2670 struct sock_xprt *transport;
0a68b0be 2671 struct rpc_xprt *ret;
a246b010 2672
d9ba131d
TM		 2673 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2674 xprt_udp_slot_table_entries);
c8541ecd
CL		 2675 if (IS_ERR(xprt))
2676 return xprt;
c8475461 2677 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2678
ec739ef0 2679 xprt->prot = IPPROTO_UDP;
808012fb 2680 xprt->tsh_size = 0;
a246b010
CL		 2681 /* XXX: header size can vary due to auth type, IPv6, etc. */
2682 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2683
03bf4b70 2684 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2685 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2686 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2687
262965f5 2688 xprt->ops = &xs_udp_ops;
a246b010 2689
ba7392bb 2690 xprt->timeout = &xs_udp_default_timeout;
a246b010 2691
8f9d5b1a
CL		 2692 switch (addr->sa_family) {
2693 case AF_INET:
2694 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2695 xprt_set_bound(xprt);
2696
2697 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2698 xs_udp_setup_socket);
9dc3b095 2699 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2700 break;
2701 case AF_INET6:
2702 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2703 xprt_set_bound(xprt);
2704
2705 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2706 xs_udp_setup_socket);
9dc3b095 2707 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2708 break;
2709 default:
0a68b0be
BF		 2710 ret = ERR_PTR(-EAFNOSUPPORT);
2711 goto out_err;
8f9d5b1a
CL		 2712 }
2713
c740eff8
CL		 2714 if (xprt_bound(xprt))
2715 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2716 xprt->address_strings[RPC_DISPLAY_ADDR],
2717 xprt->address_strings[RPC_DISPLAY_PORT],
2718 xprt->address_strings[RPC_DISPLAY_PROTO]);
2719 else
2720 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2721 xprt->address_strings[RPC_DISPLAY_ADDR],
2722 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2723
bc25571e
TT		 2724 if (try_module_get(THIS_MODULE))
2725 return xprt;
0a68b0be
BF		 2726 ret = ERR_PTR(-EINVAL);
2727out_err:
315f3812 2728 xs_xprt_free(xprt);
0a68b0be 2729 return ret;
a246b010
CL		 2730}
2731
2881ae74
TM		 2732static const struct rpc_timeout xs_tcp_default_timeout = {
2733 .to_initval = 60 * HZ,
2734 .to_maxval = 60 * HZ,
2735 .to_retries = 2,
2736};
2737
9903cd1c
CL		 2738/**
2739 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2740 * @args: rpc transport creation arguments
9903cd1c
CL		 2741 *
2742 */
483066d6 2743static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2744{
8f9d5b1a 2745 struct sockaddr *addr = args->dstaddr;
c8541ecd 2746 struct rpc_xprt *xprt;
c8475461 2747 struct sock_xprt *transport;
0a68b0be 2748 struct rpc_xprt *ret;
b7993ceb
TM		 2749 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2750
2751 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2752 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 2753
d9ba131d 2754 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 2755 max_slot_table_size);
c8541ecd
CL		 2756 if (IS_ERR(xprt))
2757 return xprt;
c8475461 2758 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2759
ec739ef0 2760 xprt->prot = IPPROTO_TCP;
808012fb 2761 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2762 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2763
03bf4b70 2764 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2765 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2766 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2767
262965f5 2768 xprt->ops = &xs_tcp_ops;
ba7392bb 2769 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2770
8f9d5b1a
CL		 2771 switch (addr->sa_family) {
2772 case AF_INET:
2773 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2774 xprt_set_bound(xprt);
2775
9dc3b095 2776 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2777 xs_tcp_setup_socket);
9dc3b095 2778 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2779 break;
2780 case AF_INET6:
2781 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2782 xprt_set_bound(xprt);
2783
9dc3b095 2784 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2785 xs_tcp_setup_socket);
9dc3b095 2786 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2787 break;
2788 default:
0a68b0be
BF		 2789 ret = ERR_PTR(-EAFNOSUPPORT);
2790 goto out_err;
8f9d5b1a
CL		 2791 }
2792
c740eff8
CL		 2793 if (xprt_bound(xprt))
2794 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2795 xprt->address_strings[RPC_DISPLAY_ADDR],
2796 xprt->address_strings[RPC_DISPLAY_PORT],
2797 xprt->address_strings[RPC_DISPLAY_PROTO]);
2798 else
2799 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2800 xprt->address_strings[RPC_DISPLAY_ADDR],
2801 xprt->address_strings[RPC_DISPLAY_PROTO]);
2802
bc25571e
TT		 2803 if (try_module_get(THIS_MODULE))
2804 return xprt;
0a68b0be
BF		 2805 ret = ERR_PTR(-EINVAL);
2806out_err:
315f3812 2807 xs_xprt_free(xprt);
0a68b0be 2808 return ret;
a246b010 2809}
282b32e1 2810
f300baba
AB		 2811/**
2812 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2813 * @args: rpc transport creation arguments
2814 *
2815 */
2816static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2817{
2818 struct sockaddr *addr = args->dstaddr;
2819 struct rpc_xprt *xprt;
2820 struct sock_xprt *transport;
2821 struct svc_sock *bc_sock;
0a68b0be 2822 struct rpc_xprt *ret;
f300baba 2823
d9ba131d
TM		 2824 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2825 xprt_tcp_slot_table_entries);
f300baba
AB		 2826 if (IS_ERR(xprt))
2827 return xprt;
2828 transport = container_of(xprt, struct sock_xprt, xprt);
2829
2830 xprt->prot = IPPROTO_TCP;
2831 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2832 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2833 xprt->timeout = &xs_tcp_default_timeout;
2834
2835 /* backchannel */
2836 xprt_set_bound(xprt);
2837 xprt->bind_timeout = 0;
f300baba
AB		 2838 xprt->reestablish_timeout = 0;
2839 xprt->idle_timeout = 0;
2840
f300baba
AB		 2841 xprt->ops = &bc_tcp_ops;
2842
2843 switch (addr->sa_family) {
2844 case AF_INET:
2845 xs_format_peer_addresses(xprt, "tcp",
2846 RPCBIND_NETID_TCP);
2847 break;
2848 case AF_INET6:
2849 xs_format_peer_addresses(xprt, "tcp",
2850 RPCBIND_NETID_TCP6);
2851 break;
2852 default:
0a68b0be
BF		 2853 ret = ERR_PTR(-EAFNOSUPPORT);
2854 goto out_err;
f300baba
AB		 2855 }
2856
50fa0d40
PE		 2857 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2858 xprt->address_strings[RPC_DISPLAY_ADDR],
2859 xprt->address_strings[RPC_DISPLAY_PORT],
2860 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2861
99de8ea9
BF		 2862 /*
2863 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 2864 * we want to keep it around as long as the connection lasts,
2865 * in case we need to start using it for a backchannel again;
2866 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 2867 */
2868 xprt_get(xprt);
2869 args->bc_xprt->xpt_bc_xprt = xprt;
2870 xprt->bc_xprt = args->bc_xprt;
2871 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2872 transport->sock = bc_sock->sk_sock;
2873 transport->inet = bc_sock->sk_sk;
2874
f300baba
AB		 2875 /*
2876 * Since we don't want connections for the backchannel, we set
2877 * the xprt status to connected
2878 */
2879 xprt_set_connected(xprt);
2880
f300baba
AB		 2881 if (try_module_get(THIS_MODULE))
2882 return xprt;
642aab58
KM		 2883
2884 args->bc_xprt->xpt_bc_xprt = NULL;
99de8ea9 2885 xprt_put(xprt);
0a68b0be
BF		 2886 ret = ERR_PTR(-EINVAL);
2887out_err:
315f3812 2888 xs_xprt_free(xprt);
0a68b0be 2889 return ret;
f300baba
AB		 2890}
2891
176e21ee
CL		 2892static struct xprt_class xs_local_transport = {
2893 .list = LIST_HEAD_INIT(xs_local_transport.list),
2894 .name = "named UNIX socket",
2895 .owner = THIS_MODULE,
2896 .ident = XPRT_TRANSPORT_LOCAL,
2897 .setup = xs_setup_local,
2898};
2899
bc25571e
TT		 2900static struct xprt_class xs_udp_transport = {
2901 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2902 .name = "udp",
2903 .owner = THIS_MODULE,
f300baba 2904 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2905 .setup = xs_setup_udp,
2906};
2907
2908static struct xprt_class xs_tcp_transport = {
2909 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2910 .name = "tcp",
2911 .owner = THIS_MODULE,
f300baba 2912 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2913 .setup = xs_setup_tcp,
2914};
2915
f300baba
AB		 2916static struct xprt_class xs_bc_tcp_transport = {
2917 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2918 .name = "tcp NFSv4.1 backchannel",
2919 .owner = THIS_MODULE,
2920 .ident = XPRT_TRANSPORT_BC_TCP,
2921 .setup = xs_setup_bc_tcp,
2922};
2923
282b32e1 2924/**
bc25571e 2925 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2926 *
2927 */
2928int init_socket_xprt(void)
2929{
f895b252 2930#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2b1bec5f 2931 if (!sunrpc_table_header)
0b4d4147 2932 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2933#endif
2934
176e21ee 2935 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2936 xprt_register_transport(&xs_udp_transport);
2937 xprt_register_transport(&xs_tcp_transport);
f300baba 2938 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2939
282b32e1
CL		 2940 return 0;
2941}
2942
2943/**
bc25571e 2944 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2945 *
2946 */
2947void cleanup_socket_xprt(void)
2948{
f895b252 2949#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
fbf76683
CL		 2950 if (sunrpc_table_header) {
2951 unregister_sysctl_table(sunrpc_table_header);
2952 sunrpc_table_header = NULL;
2953 }
2954#endif
bc25571e 2955
176e21ee 2956 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2957 xprt_unregister_transport(&xs_udp_transport);
2958 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2959 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2960}
cbf11071 2961
9bbb9e5a
RR		 2962static int param_set_uint_minmax(const char *val,
2963 const struct kernel_param *kp,
cbf11071
TM		 2964 unsigned int min, unsigned int max)
2965{
00cfaa94 2966 unsigned int num;
cbf11071
TM		 2967 int ret;
2968
2969 if (!val)
2970 return -EINVAL;
00cfaa94 2971 ret = kstrtouint(val, 0, &num);
cbf11071
TM		 2972 if (ret == -EINVAL || num < min || num > max)
2973 return -EINVAL;
2974 *((unsigned int *)kp->arg) = num;
2975 return 0;
2976}
2977
9bbb9e5a 2978static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 2979{
2980 return param_set_uint_minmax(val, kp,
2981 RPC_MIN_RESVPORT,
2982 RPC_MAX_RESVPORT);
2983}
2984
9c27847d 2985static const struct kernel_param_ops param_ops_portnr = {
9bbb9e5a
RR		 2986 .set = param_set_portnr,
2987 .get = param_get_uint,
2988};
2989
cbf11071
TM		 2990#define param_check_portnr(name, p) \
2991 __param_check(name, p, unsigned int);
2992
2993module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2994module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2995
9bbb9e5a
RR		 2996static int param_set_slot_table_size(const char *val,
2997 const struct kernel_param *kp)
cbf11071
TM		 2998{
2999 return param_set_uint_minmax(val, kp,
3000 RPC_MIN_SLOT_TABLE,
3001 RPC_MAX_SLOT_TABLE);
3002}
3003
9c27847d 3004static const struct kernel_param_ops param_ops_slot_table_size = {
9bbb9e5a
RR		 3005 .set = param_set_slot_table_size,
3006 .get = param_get_uint,
3007};
3008
cbf11071
TM		 3009#define param_check_slot_table_size(name, p) \
3010 __param_check(name, p, unsigned int);
3011
d9ba131d
TM		 3012static int param_set_max_slot_table_size(const char *val,
3013 const struct kernel_param *kp)
3014{
3015 return param_set_uint_minmax(val, kp,
3016 RPC_MIN_SLOT_TABLE,
3017 RPC_MAX_SLOT_TABLE_LIMIT);
3018}
3019
9c27847d 3020static const struct kernel_param_ops param_ops_max_slot_table_size = {
d9ba131d
TM		 3021 .set = param_set_max_slot_table_size,
3022 .get = param_get_uint,
3023};
3024
3025#define param_check_max_slot_table_size(name, p) \
3026 __param_check(name, p, unsigned int);
3027
cbf11071
TM		 3028module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3029 slot_table_size, 0644);
d9ba131d
TM		 3030module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3031 max_slot_table_size, 0644);
cbf11071
TM		 3032module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3033 slot_table_size, 0644);
3034
Linux kernel - Deliverables
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