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arch: Mass conversion of smp_mb__*()
[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
7d1e8255 66#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 67static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 68
fbf76683
CL		 69/*
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
73 *
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
76 */
77
78#ifdef RPC_DEBUG
79
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
a246b010
CL		 189#ifdef RPC_DEBUG
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
ffc2e518
CL		 219struct sock_xprt {
220 struct rpc_xprt xprt;
ee0ac0c2
CL		 221
222 /*
223 * Network layer
224 */
225 struct socket * sock;
226 struct sock * inet;
51971139
CL		 227
228 /*
229 * State of TCP reply receive
230 */
231 __be32 tcp_fraghdr,
b76ce561
TM		 232 tcp_xid,
233 tcp_calldir;
51971139
CL		 234
235 u32 tcp_offset,
236 tcp_reclen;
237
238 unsigned long tcp_copied,
239 tcp_flags;
c8475461
CL		 240
241 /*
242 * Connection of transports
243 */
34161db6 244 struct delayed_work connect_worker;
fbfffbd5
CL		 245 struct sockaddr_storage srcaddr;
246 unsigned short srcport;
7c6e066e
CL		 247
248 /*
249 * UDP socket buffer size parameters
250 */
251 size_t rcvsize,
252 sndsize;
314dfd79
CL		 253
254 /*
255 * Saved socket callback addresses
256 */
676d2369 257 void (*old_data_ready)(struct sock *);
314dfd79
CL		 258 void (*old_state_change)(struct sock *);
259 void (*old_write_space)(struct sock *);
2118071d 260 void (*old_error_report)(struct sock *);
ffc2e518
CL		 261};
262
e136d092
CL		 263/*
264 * TCP receive state flags
265 */
266#define TCP_RCV_LAST_FRAG (1UL << 0)
267#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268#define TCP_RCV_COPY_XID (1UL << 2)
269#define TCP_RCV_COPY_DATA (1UL << 3)
f4a2e418
RL		 270#define TCP_RCV_READ_CALLDIR (1UL << 4)
271#define TCP_RCV_COPY_CALLDIR (1UL << 5)
18dca02a
RL		 272
273/*
274 * TCP RPC flags
275 */
f4a2e418 276#define TCP_RPC_REPLY (1UL << 6)
e136d092 277
2118071d
TM		 278static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
279{
280 return (struct rpc_xprt *) sk->sk_user_data;
281}
282
95392c59
CL		 283static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
284{
285 return (struct sockaddr *) &xprt->addr;
286}
287
176e21ee
CL		 288static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
289{
290 return (struct sockaddr_un *) &xprt->addr;
291}
292
95392c59 293static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 294{
95392c59
CL		 295 return (struct sockaddr_in *) &xprt->addr;
296}
297
298static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
299{
300 return (struct sockaddr_in6 *) &xprt->addr;
301}
302
c877b849 303static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 304{
c877b849 305 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 306 struct sockaddr_in6 *sin6;
307 struct sockaddr_in *sin;
176e21ee 308 struct sockaddr_un *sun;
c877b849 309 char buf[128];
edb267a6 310
9dc3b095 311 switch (sap->sa_family) {
176e21ee
CL		 312 case AF_LOCAL:
313 sun = xs_addr_un(xprt);
314 strlcpy(buf, sun->sun_path, sizeof(buf));
315 xprt->address_strings[RPC_DISPLAY_ADDR] =
316 kstrdup(buf, GFP_KERNEL);
317 break;
9dc3b095 318 case AF_INET:
176e21ee
CL		 319 (void)rpc_ntop(sap, buf, sizeof(buf));
320 xprt->address_strings[RPC_DISPLAY_ADDR] =
321 kstrdup(buf, GFP_KERNEL);
9dc3b095 322 sin = xs_addr_in(xprt);
fc0b5791 323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 324 break;
325 case AF_INET6:
176e21ee
CL		 326 (void)rpc_ntop(sap, buf, sizeof(buf));
327 xprt->address_strings[RPC_DISPLAY_ADDR] =
328 kstrdup(buf, GFP_KERNEL);
9dc3b095 329 sin6 = xs_addr_in6(xprt);
fc0b5791 330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 331 break;
332 default:
333 BUG();
756805e7 334 }
176e21ee 335
9dc3b095 336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 337}
338
9dc3b095 339static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 340{
9dc3b095
CL		 341 struct sockaddr *sap = xs_addr(xprt);
342 char buf[128];
4b6473fb 343
81160e66 344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 346
81160e66 347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
349}
4b6473fb 350
9dc3b095
CL		 351static void xs_format_peer_addresses(struct rpc_xprt *xprt,
352 const char *protocol,
353 const char *netid)
c877b849 354{
b454ae90 355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 356 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 357 xs_format_common_peer_addresses(xprt);
9dc3b095 358 xs_format_common_peer_ports(xprt);
edb267a6 359}
4b6473fb 360
9dc3b095 361static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 362{
9dc3b095
CL		 363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 365
9dc3b095 366 xs_format_common_peer_ports(xprt);
edb267a6
CL		 367}
368
369static void xs_free_peer_addresses(struct rpc_xprt *xprt)
370{
33e01dc7
CL		 371 unsigned int i;
372
373 for (i = 0; i < RPC_DISPLAY_MAX; i++)
374 switch (i) {
375 case RPC_DISPLAY_PROTO:
376 case RPC_DISPLAY_NETID:
377 continue;
378 default:
379 kfree(xprt->address_strings[i]);
380 }
edb267a6
CL		 381}
382
b4b5cc85
CL		 383#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
384
24c5684b 385static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 386{
b4b5cc85
CL		 387 struct msghdr msg = {
388 .msg_name = addr,
389 .msg_namelen = addrlen,
24c5684b
TM		 390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
391 };
392 struct kvec iov = {
393 .iov_base = vec->iov_base + base,
394 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 395 };
396
24c5684b 397 if (iov.iov_len != 0)
b4b5cc85
CL		 398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
399 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
400}
401
a6b31d18 402static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
b4b5cc85 403{
a6b31d18
TM		 404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
405 int offset, size_t size, int flags);
24c5684b
TM		 406 struct page **ppage;
407 unsigned int remainder;
408 int err, sent = 0;
409
410 remainder = xdr->page_len - base;
411 base += xdr->page_base;
412 ppage = xdr->pages + (base >> PAGE_SHIFT);
413 base &= ~PAGE_MASK;
a6b31d18
TM		 414 do_sendpage = sock->ops->sendpage;
415 if (!zerocopy)
416 do_sendpage = sock_no_sendpage;
24c5684b
TM		 417 for(;;) {
418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
419 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 420
24c5684b
TM		 421 remainder -= len;
422 if (remainder != 0 || more)
423 flags |= MSG_MORE;
a6b31d18 424 err = do_sendpage(sock, *ppage, base, len, flags);
24c5684b
TM		 425 if (remainder == 0 || err != len)
426 break;
427 sent += err;
428 ppage++;
429 base = 0;
430 }
431 if (sent == 0)
432 return err;
433 if (err > 0)
434 sent += err;
435 return sent;
b4b5cc85
CL		 436}
437
9903cd1c
CL		 438/**
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
a6b31d18 445 * @zerocopy: true if it is safe to use sendpage()
9903cd1c 446 *
a246b010 447 */
a6b31d18 448static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
a246b010 449{
24c5684b
TM		 450 unsigned int remainder = xdr->len - base;
451 int err, sent = 0;
a246b010 452
262965f5 453 if (unlikely(!sock))
fba91afb 454 return -ENOTSOCK;
262965f5
CL		 455
456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 457 if (base != 0) {
458 addr = NULL;
459 addrlen = 0;
460 }
262965f5 461
24c5684b
TM		 462 if (base < xdr->head[0].iov_len || addr != NULL) {
463 unsigned int len = xdr->head[0].iov_len - base;
464 remainder -= len;
465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
466 if (remainder == 0 || err != len)
a246b010 467 goto out;
24c5684b 468 sent += err;
a246b010
CL		 469 base = 0;
470 } else
24c5684b 471 base -= xdr->head[0].iov_len;
a246b010 472
24c5684b
TM		 473 if (base < xdr->page_len) {
474 unsigned int len = xdr->page_len - base;
475 remainder -= len;
a6b31d18 476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
24c5684b 477 if (remainder == 0 || err != len)
a246b010 478 goto out;
24c5684b 479 sent += err;
a246b010 480 base = 0;
24c5684b
TM		 481 } else
482 base -= xdr->page_len;
483
484 if (base >= xdr->tail[0].iov_len)
485 return sent;
486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 487out:
24c5684b
TM		 488 if (sent == 0)
489 return err;
490 if (err > 0)
491 sent += err;
492 return sent;
a246b010
CL		 493}
494
b6ddf64f
TM		 495static void xs_nospace_callback(struct rpc_task *task)
496{
497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
498
499 transport->inet->sk_write_pending--;
500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
501}
502
9903cd1c 503/**
262965f5
CL		 504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
9903cd1c 506 *
a246b010 507 */
5e3771ce 508static int xs_nospace(struct rpc_task *task)
a246b010 509{
262965f5
CL		 510 struct rpc_rqst *req = task->tk_rqstp;
511 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
06ea0bfe 513 struct sock *sk = transport->inet;
24ca9a84 514 int ret = -EAGAIN;
a246b010 515
46121cf7 516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 517 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
518 req->rq_slen);
519
b6ddf64f
TM		 520 /* Protect against races with write_space */
521 spin_lock_bh(&xprt->transport_lock);
522
523 /* Don't race with disconnect */
524 if (xprt_connected(xprt)) {
525 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
526 /*
527 * Notify TCP that we're limited by the application
528 * window size
529 */
530 set_bit(SOCK_NOSPACE, &transport->sock->flags);
06ea0bfe 531 sk->sk_write_pending++;
b6ddf64f
TM		 532 /* ...and wait for more buffer space */
533 xprt_wait_for_buffer_space(task, xs_nospace_callback);
534 }
535 } else {
536 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 537 ret = -ENOTCONN;
b6ddf64f 538 }
262965f5 539
b6ddf64f 540 spin_unlock_bh(&xprt->transport_lock);
06ea0bfe
TM		 541
542 /* Race breaker in case memory is freed before above code is called */
543 sk->sk_write_space(sk);
5e3771ce 544 return ret;
262965f5
CL		 545}
546
61677eee
CL		 547/*
548 * Construct a stream transport record marker in @buf.
549 */
550static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
551{
552 u32 reclen = buf->len - sizeof(rpc_fraghdr);
553 rpc_fraghdr *base = buf->head[0].iov_base;
554 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
555}
556
176e21ee
CL		 557/**
558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
559 * @task: RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568static int xs_local_send_request(struct rpc_task *task)
569{
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport =
573 container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_encode_stream_record_marker(&req->rq_snd_buf);
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base, req->rq_svec->iov_len);
581
582 status = xs_sendpages(transport->sock, NULL, 0,
a6b31d18 583 xdr, req->rq_bytes_sent, true);
176e21ee
CL		 584 dprintk("RPC: %s(%u) = %d\n",
585 __func__, xdr->len - req->rq_bytes_sent, status);
586 if (likely(status >= 0)) {
587 req->rq_bytes_sent += status;
588 req->rq_xmit_bytes_sent += status;
589 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
590 req->rq_bytes_sent = 0;
591 return 0;
592 }
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -EAGAIN:
598 status = xs_nospace(task);
599 break;
600 default:
601 dprintk("RPC: sendmsg returned unrecognized error %d\n",
602 -status);
603 case -EPIPE:
604 xs_close(xprt);
605 status = -ENOTCONN;
606 }
607
608 return status;
609}
610
262965f5
CL		 611/**
612 * xs_udp_send_request - write an RPC request to a UDP socket
613 * @task: address of RPC task that manages the state of an RPC request
614 *
615 * Return values:
616 * 0: The request has been sent
617 * EAGAIN: The socket was blocked, please call again later to
618 * complete the request
619 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 620 * other: Some other error occurred, the request was not sent
262965f5
CL		 621 */
622static int xs_udp_send_request(struct rpc_task *task)
623{
624 struct rpc_rqst *req = task->tk_rqstp;
625 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 626 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5
CL		 627 struct xdr_buf *xdr = &req->rq_snd_buf;
628 int status;
a246b010 629
9903cd1c 630 xs_pktdump("packet data:",
a246b010
CL		 631 req->rq_svec->iov_base,
632 req->rq_svec->iov_len);
633
01d37c42
TM		 634 if (!xprt_bound(xprt))
635 return -ENOTCONN;
ee0ac0c2 636 status = xs_sendpages(transport->sock,
95392c59 637 xs_addr(xprt),
ee0ac0c2 638 xprt->addrlen, xdr,
a6b31d18 639 req->rq_bytes_sent, true);
a246b010 640
46121cf7 641 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 642 xdr->len - req->rq_bytes_sent, status);
a246b010 643
2199700f 644 if (status >= 0) {
d60dbb20 645 req->rq_xmit_bytes_sent += status;
2199700f
TM		 646 if (status >= req->rq_slen)
647 return 0;
648 /* Still some bytes left; set up for a retry later. */
262965f5 649 status = -EAGAIN;
2199700f 650 }
a246b010 651
262965f5 652 switch (status) {
fba91afb
TM		 653 case -ENOTSOCK:
654 status = -ENOTCONN;
655 /* Should we call xs_close() here? */
656 break;
b6ddf64f 657 case -EAGAIN:
5e3771ce 658 status = xs_nospace(task);
b6ddf64f 659 break;
c8485e4d
TM		 660 default:
661 dprintk("RPC: sendmsg returned unrecognized error %d\n",
662 -status);
262965f5
CL		 663 case -ENETUNREACH:
664 case -EPIPE:
a246b010
CL		 665 case -ECONNREFUSED:
666 /* When the server has died, an ICMP port unreachable message
9903cd1c 667 * prompts ECONNREFUSED. */
b6ddf64f 668 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 669 }
5fe46e9d 670
262965f5 671 return status;
a246b010
CL		 672}
673
e06799f9
TM		 674/**
675 * xs_tcp_shutdown - gracefully shut down a TCP socket
676 * @xprt: transport
677 *
678 * Initiates a graceful shutdown of the TCP socket by calling the
679 * equivalent of shutdown(SHUT_WR);
680 */
681static void xs_tcp_shutdown(struct rpc_xprt *xprt)
682{
683 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
684 struct socket *sock = transport->sock;
685
40b5ea0c 686 if (sock != NULL) {
e06799f9 687 kernel_sock_shutdown(sock, SHUT_WR);
40b5ea0c
TM		 688 trace_rpc_socket_shutdown(xprt, sock);
689 }
e06799f9
TM		 690}
691
9903cd1c 692/**
262965f5 693 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 694 * @task: address of RPC task that manages the state of an RPC request
695 *
696 * Return values:
262965f5
CL		 697 * 0: The request has been sent
698 * EAGAIN: The socket was blocked, please call again later to
699 * complete the request
700 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 701 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 702 *
703 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 704 * if sendmsg is not able to make progress?
9903cd1c 705 */
262965f5 706static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 707{
708 struct rpc_rqst *req = task->tk_rqstp;
709 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 710 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 711 struct xdr_buf *xdr = &req->rq_snd_buf;
a6b31d18 712 bool zerocopy = true;
b595bb15 713 int status;
a246b010 714
61677eee 715 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 716
262965f5
CL		 717 xs_pktdump("packet data:",
718 req->rq_svec->iov_base,
719 req->rq_svec->iov_len);
a6b31d18
TM		 720 /* Don't use zero copy if this is a resend. If the RPC call
721 * completes while the socket holds a reference to the pages,
722 * then we may end up resending corrupted data.
723 */
724 if (task->tk_flags & RPC_TASK_SENT)
725 zerocopy = false;
a246b010
CL		 726
727 /* Continue transmitting the packet/record. We must be careful
728 * to cope with writespace callbacks arriving _after_ we have
262965f5 729 * called sendmsg(). */
a246b010 730 while (1) {
ee0ac0c2 731 status = xs_sendpages(transport->sock,
a6b31d18
TM		 732 NULL, 0, xdr, req->rq_bytes_sent,
733 zerocopy);
a246b010 734
46121cf7 735 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 736 xdr->len - req->rq_bytes_sent, status);
a246b010 737
262965f5 738 if (unlikely(status < 0))
a246b010 739 break;
a246b010 740
262965f5
CL		 741 /* If we've sent the entire packet, immediately
742 * reset the count of bytes sent. */
743 req->rq_bytes_sent += status;
d60dbb20 744 req->rq_xmit_bytes_sent += status;
262965f5
CL		 745 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
746 req->rq_bytes_sent = 0;
747 return 0;
748 }
a246b010 749
06b4b681
TM		 750 if (status != 0)
751 continue;
a246b010 752 status = -EAGAIN;
06b4b681 753 break;
a246b010
CL		 754 }
755
262965f5 756 switch (status) {
fba91afb
TM		 757 case -ENOTSOCK:
758 status = -ENOTCONN;
759 /* Should we call xs_close() here? */
760 break;
262965f5 761 case -EAGAIN:
5e3771ce 762 status = xs_nospace(task);
262965f5 763 break;
c8485e4d
TM		 764 default:
765 dprintk("RPC: sendmsg returned unrecognized error %d\n",
766 -status);
262965f5 767 case -ECONNRESET:
2a9e1cfa
TM		 768 xs_tcp_shutdown(xprt);
769 case -ECONNREFUSED:
262965f5 770 case -ENOTCONN:
b9d2bb2e 771 case -EPIPE:
b6ddf64f 772 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 773 }
5fe46e9d 774
a246b010
CL		 775 return status;
776}
777
e0ab53de
TM		 778/**
779 * xs_tcp_release_xprt - clean up after a tcp transmission
780 * @xprt: transport
781 * @task: rpc task
782 *
783 * This cleans up if an error causes us to abort the transmission of a request.
784 * In this case, the socket may need to be reset in order to avoid confusing
785 * the server.
786 */
787static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
788{
789 struct rpc_rqst *req;
790
791 if (task != xprt->snd_task)
792 return;
793 if (task == NULL)
794 goto out_release;
795 req = task->tk_rqstp;
43cedbf0
TM		 796 if (req == NULL)
797 goto out_release;
e0ab53de
TM		 798 if (req->rq_bytes_sent == 0)
799 goto out_release;
800 if (req->rq_bytes_sent == req->rq_snd_buf.len)
801 goto out_release;
a4f0835c 802 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 803out_release:
804 xprt_release_xprt(xprt, task);
805}
806
2a9e1cfa
TM		 807static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
808{
809 transport->old_data_ready = sk->sk_data_ready;
810 transport->old_state_change = sk->sk_state_change;
811 transport->old_write_space = sk->sk_write_space;
2118071d 812 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 813}
814
815static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
816{
817 sk->sk_data_ready = transport->old_data_ready;
818 sk->sk_state_change = transport->old_state_change;
819 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 820 sk->sk_error_report = transport->old_error_report;
821}
822
823/**
824 * xs_error_report - callback to handle TCP socket state errors
825 * @sk: socket
826 *
827 * Note: we don't call sock_error() since there may be a rpc_task
828 * using the socket, and so we don't want to clear sk->sk_err.
829 */
830static void xs_error_report(struct sock *sk)
831{
832 struct rpc_xprt *xprt;
833 int err;
834
835 read_lock_bh(&sk->sk_callback_lock);
836 if (!(xprt = xprt_from_sock(sk)))
837 goto out;
838
839 err = -sk->sk_err;
840 if (err == 0)
841 goto out;
842 dprintk("RPC: xs_error_report client %p, error=%d...\n",
843 xprt, -err);
e8353c76 844 trace_rpc_socket_error(xprt, sk->sk_socket, err);
2118071d
TM		 845 xprt_wake_pending_tasks(xprt, err);
846 out:
847 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 848}
849
fe315e76 850static void xs_reset_transport(struct sock_xprt *transport)
a246b010 851{
ee0ac0c2
CL		 852 struct socket *sock = transport->sock;
853 struct sock *sk = transport->inet;
a246b010 854
fe315e76
CL		 855 if (sk == NULL)
856 return;
9903cd1c 857
246408dc
TM		 858 transport->srcport = 0;
859
a246b010 860 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 861 transport->inet = NULL;
862 transport->sock = NULL;
a246b010 863
9903cd1c 864 sk->sk_user_data = NULL;
2a9e1cfa
TM		 865
866 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 867 write_unlock_bh(&sk->sk_callback_lock);
868
9903cd1c 869 sk->sk_no_check = 0;
a246b010 870
40b5ea0c 871 trace_rpc_socket_close(&transport->xprt, sock);
a246b010 872 sock_release(sock);
fe315e76
CL		 873}
874
875/**
876 * xs_close - close a socket
877 * @xprt: transport
878 *
879 * This is used when all requests are complete; ie, no DRC state remains
880 * on the server we want to save.
f75e6745
TM		 881 *
882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
883 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 884 */
885static void xs_close(struct rpc_xprt *xprt)
886{
887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
888
889 dprintk("RPC: xs_close xprt %p\n", xprt);
890
93dc41bd
N		 891 cancel_delayed_work_sync(&transport->connect_worker);
892
fe315e76 893 xs_reset_transport(transport);
61d0a8e6 894 xprt->reestablish_timeout = 0;
fe315e76 895
4e857c58 896 smp_mb__before_atomic();
7d1e8255 897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 898 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 899 clear_bit(XPRT_CLOSING, &xprt->state);
4e857c58 900 smp_mb__after_atomic();
62da3b24 901 xprt_disconnect_done(xprt);
a246b010
CL		 902}
903
f75e6745
TM		 904static void xs_tcp_close(struct rpc_xprt *xprt)
905{
906 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
907 xs_close(xprt);
908 else
909 xs_tcp_shutdown(xprt);
910}
911
315f3812
KM		 912static void xs_xprt_free(struct rpc_xprt *xprt)
913{
914 xs_free_peer_addresses(xprt);
915 xprt_free(xprt);
916}
917
9903cd1c
CL		 918/**
919 * xs_destroy - prepare to shutdown a transport
920 * @xprt: doomed transport
921 *
922 */
923static void xs_destroy(struct rpc_xprt *xprt)
a246b010 924{
46121cf7 925 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 926
a1311d87 927 xs_close(xprt);
315f3812 928 xs_xprt_free(xprt);
a1311d87 929 module_put(THIS_MODULE);
a246b010
CL		 930}
931
176e21ee
CL		 932static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
933{
934 struct xdr_skb_reader desc = {
935 .skb = skb,
936 .offset = sizeof(rpc_fraghdr),
937 .count = skb->len - sizeof(rpc_fraghdr),
938 };
939
940 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
941 return -1;
942 if (desc.count)
943 return -1;
944 return 0;
945}
946
947/**
948 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
949 * @sk: socket with data to read
950 * @len: how much data to read
951 *
952 * Currently this assumes we can read the whole reply in a single gulp.
953 */
676d2369 954static void xs_local_data_ready(struct sock *sk)
176e21ee
CL		 955{
956 struct rpc_task *task;
957 struct rpc_xprt *xprt;
958 struct rpc_rqst *rovr;
959 struct sk_buff *skb;
960 int err, repsize, copied;
961 u32 _xid;
962 __be32 *xp;
963
964 read_lock_bh(&sk->sk_callback_lock);
965 dprintk("RPC: %s...\n", __func__);
966 xprt = xprt_from_sock(sk);
967 if (xprt == NULL)
968 goto out;
969
970 skb = skb_recv_datagram(sk, 0, 1, &err);
971 if (skb == NULL)
972 goto out;
973
176e21ee
CL		 974 repsize = skb->len - sizeof(rpc_fraghdr);
975 if (repsize < 4) {
976 dprintk("RPC: impossible RPC reply size %d\n", repsize);
977 goto dropit;
978 }
979
980 /* Copy the XID from the skb... */
981 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
982 if (xp == NULL)
983 goto dropit;
984
985 /* Look up and lock the request corresponding to the given XID */
986 spin_lock(&xprt->transport_lock);
987 rovr = xprt_lookup_rqst(xprt, *xp);
988 if (!rovr)
989 goto out_unlock;
990 task = rovr->rq_task;
991
992 copied = rovr->rq_private_buf.buflen;
993 if (copied > repsize)
994 copied = repsize;
995
996 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
997 dprintk("RPC: sk_buff copy failed\n");
998 goto out_unlock;
999 }
1000
1001 xprt_complete_rqst(task, copied);
1002
1003 out_unlock:
1004 spin_unlock(&xprt->transport_lock);
1005 dropit:
1006 skb_free_datagram(sk, skb);
1007 out:
1008 read_unlock_bh(&sk->sk_callback_lock);
1009}
1010
9903cd1c
CL		 1011/**
1012 * xs_udp_data_ready - "data ready" callback for UDP sockets
1013 * @sk: socket with data to read
1014 * @len: how much data to read
1015 *
a246b010 1016 */
676d2369 1017static void xs_udp_data_ready(struct sock *sk)
a246b010 1018{
9903cd1c
CL		 1019 struct rpc_task *task;
1020 struct rpc_xprt *xprt;
a246b010 1021 struct rpc_rqst *rovr;
9903cd1c 1022 struct sk_buff *skb;
a246b010 1023 int err, repsize, copied;
d8ed029d
AD		 1024 u32 _xid;
1025 __be32 *xp;
a246b010 1026
f064af1e 1027 read_lock_bh(&sk->sk_callback_lock);
46121cf7 1028 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 1029 if (!(xprt = xprt_from_sock(sk)))
a246b010 1030 goto out;
a246b010
CL		 1031
1032 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1033 goto out;
1034
a246b010
CL		 1035 repsize = skb->len - sizeof(struct udphdr);
1036 if (repsize < 4) {
46121cf7 1037 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 1038 goto dropit;
1039 }
1040
1041 /* Copy the XID from the skb... */
1042 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1043 sizeof(_xid), &_xid);
1044 if (xp == NULL)
1045 goto dropit;
1046
1047 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 1048 spin_lock(&xprt->transport_lock);
a246b010
CL		 1049 rovr = xprt_lookup_rqst(xprt, *xp);
1050 if (!rovr)
1051 goto out_unlock;
1052 task = rovr->rq_task;
1053
a246b010
CL		 1054 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1055 copied = repsize;
1056
1057 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1058 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1059 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1060 goto out_unlock;
1781f7f5
HX		 1061 }
1062
1063 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1064
6a24dfb6 1065 xprt_adjust_cwnd(xprt, task, copied);
1570c1e4 1066 xprt_complete_rqst(task, copied);
a246b010
CL		 1067
1068 out_unlock:
4a0f8c04 1069 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1070 dropit:
1071 skb_free_datagram(sk, skb);
1072 out:
f064af1e 1073 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1074}
1075
a519fc7a
TM		 1076/*
1077 * Helper function to force a TCP close if the server is sending
1078 * junk and/or it has put us in CLOSE_WAIT
1079 */
1080static void xs_tcp_force_close(struct rpc_xprt *xprt)
1081{
1082 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1083 xprt_force_disconnect(xprt);
1084}
1085
dd456471 1086static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1087{
51971139 1088 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1089 size_t len, used;
1090 char *p;
1091
51971139
CL		 1092 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1093 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1094 used = xdr_skb_read_bits(desc, p, len);
51971139 1095 transport->tcp_offset += used;
a246b010
CL		 1096 if (used != len)
1097 return;
808012fb 1098
51971139
CL		 1099 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1100 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1101 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1102 else
e136d092 1103 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1104 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1105
e136d092 1106 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1107 transport->tcp_offset = 0;
808012fb 1108
a246b010 1109 /* Sanity check of the record length */
18dca02a 1110 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1111 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1112 xs_tcp_force_close(xprt);
9903cd1c 1113 return;
a246b010 1114 }
46121cf7 1115 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1116 transport->tcp_reclen);
a246b010
CL		 1117}
1118
51971139 1119static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1120{
51971139 1121 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1122 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1123 transport->tcp_offset = 0;
e136d092
CL		 1124 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1125 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1126 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1127 transport->tcp_copied = 0;
a246b010
CL		 1128 }
1129 }
1130}
1131
dd456471 1132static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1133{
1134 size_t len, used;
1135 char *p;
1136
51971139 1137 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1138 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1139 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1140 used = xdr_skb_read_bits(desc, p, len);
51971139 1141 transport->tcp_offset += used;
a246b010
CL		 1142 if (used != len)
1143 return;
e136d092 1144 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1145 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1146 transport->tcp_copied = 4;
18dca02a
RL		 1147 dprintk("RPC: reading %s XID %08x\n",
1148 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1149 : "request with",
51971139
CL		 1150 ntohl(transport->tcp_xid));
1151 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1152}
1153
18dca02a
RL		 1154static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1155 struct xdr_skb_reader *desc)
a246b010 1156{
18dca02a
RL		 1157 size_t len, used;
1158 u32 offset;
b76ce561 1159 char *p;
18dca02a
RL		 1160
1161 /*
1162 * We want transport->tcp_offset to be 8 at the end of this routine
1163 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1164 * When this function is called for the first time,
1165 * transport->tcp_offset is 4 (after having already read the xid).
1166 */
1167 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1168 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1169 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1170 p = ((char *) &transport->tcp_calldir) + offset;
1171 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1172 transport->tcp_offset += used;
1173 if (used != len)
1174 return;
f4a2e418 1175 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1176 /*
1177 * We don't yet have the XDR buffer, so we will write the calldir
1178 * out after we get the buffer from the 'struct rpc_rqst'
1179 */
b76ce561
TM		 1180 switch (ntohl(transport->tcp_calldir)) {
1181 case RPC_REPLY:
1182 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1183 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1184 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1185 break;
1186 case RPC_CALL:
1187 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1188 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1189 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1190 break;
1191 default:
1192 dprintk("RPC: invalid request message type\n");
a519fc7a 1193 xs_tcp_force_close(&transport->xprt);
b76ce561 1194 }
18dca02a
RL		 1195 xs_tcp_check_fraghdr(transport);
1196}
1197
44b98efd
RL		 1198static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1199 struct xdr_skb_reader *desc,
1200 struct rpc_rqst *req)
a246b010 1201{
44b98efd
RL		 1202 struct sock_xprt *transport =
1203 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1204 struct xdr_buf *rcvbuf;
1205 size_t len;
1206 ssize_t r;
1207
a246b010 1208 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1209
1210 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1211 /*
1212 * Save the RPC direction in the XDR buffer
1213 */
f4a2e418 1214 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1215 &transport->tcp_calldir,
1216 sizeof(transport->tcp_calldir));
1217 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1218 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1219 }
1220
a246b010 1221 len = desc->count;
51971139 1222 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1223 struct xdr_skb_reader my_desc;
a246b010 1224
51971139 1225 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1226 memcpy(&my_desc, desc, sizeof(my_desc));
1227 my_desc.count = len;
51971139 1228 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1229 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1230 desc->count -= r;
1231 desc->offset += r;
1232 } else
51971139 1233 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1234 desc, xdr_skb_read_bits);
a246b010
CL		 1235
1236 if (r > 0) {
51971139
CL		 1237 transport->tcp_copied += r;
1238 transport->tcp_offset += r;
a246b010
CL		 1239 }
1240 if (r != len) {
1241 /* Error when copying to the receive buffer,
1242 * usually because we weren't able to allocate
1243 * additional buffer pages. All we can do now
e136d092 1244 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1245 * will not receive any additional updates,
1246 * and time out.
1247 * Any remaining data from this record will
1248 * be discarded.
1249 */
e136d092 1250 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1251 dprintk("RPC: XID %08x truncated request\n",
51971139 1252 ntohl(transport->tcp_xid));
46121cf7
CL		 1253 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1254 "tcp_offset = %u, tcp_reclen = %u\n",
1255 xprt, transport->tcp_copied,
1256 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1257 return;
a246b010
CL		 1258 }
1259
46121cf7 1260 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1261 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1262 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1263 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1264 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1265
1266 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1267 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1268 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1269 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1270 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1271 }
44b98efd
RL		 1272}
1273
1274/*
1275 * Finds the request corresponding to the RPC xid and invokes the common
1276 * tcp read code to read the data.
1277 */
1278static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1279 struct xdr_skb_reader *desc)
1280{
1281 struct sock_xprt *transport =
1282 container_of(xprt, struct sock_xprt, xprt);
1283 struct rpc_rqst *req;
1284
1285 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1286
1287 /* Find and lock the request corresponding to this xid */
1288 spin_lock(&xprt->transport_lock);
1289 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1290 if (!req) {
1291 dprintk("RPC: XID %08x request not found!\n",
1292 ntohl(transport->tcp_xid));
1293 spin_unlock(&xprt->transport_lock);
1294 return -1;
1295 }
1296
1297 xs_tcp_read_common(xprt, desc, req);
1298
e136d092 1299 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1300 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1301
4a0f8c04 1302 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1303 return 0;
1304}
1305
9e00abc3 1306#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1307/*
1308 * Obtains an rpc_rqst previously allocated and invokes the common
1309 * tcp read code to read the data. The result is placed in the callback
1310 * queue.
1311 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1312 * connection and return -1.
1313 */
2ea24497 1314static int xs_tcp_read_callback(struct rpc_xprt *xprt,
44b98efd
RL		 1315 struct xdr_skb_reader *desc)
1316{
1317 struct sock_xprt *transport =
1318 container_of(xprt, struct sock_xprt, xprt);
1319 struct rpc_rqst *req;
1320
2ea24497
TM		 1321 /* Look up and lock the request corresponding to the given XID */
1322 spin_lock(&xprt->transport_lock);
1323 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
44b98efd 1324 if (req == NULL) {
2ea24497 1325 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1326 printk(KERN_WARNING "Callback slot table overflowed\n");
1327 xprt_force_disconnect(xprt);
1328 return -1;
1329 }
1330
44b98efd
RL		 1331 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1332 xs_tcp_read_common(xprt, desc, req);
1333
2ea24497
TM		 1334 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1335 xprt_complete_bc_request(req, transport->tcp_copied);
1336 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1337
1338 return 0;
1339}
1340
1341static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1342 struct xdr_skb_reader *desc)
1343{
1344 struct sock_xprt *transport =
1345 container_of(xprt, struct sock_xprt, xprt);
1346
1347 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1348 xs_tcp_read_reply(xprt, desc) :
1349 xs_tcp_read_callback(xprt, desc);
1350}
1351#else
1352static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1353 struct xdr_skb_reader *desc)
1354{
1355 return xs_tcp_read_reply(xprt, desc);
1356}
9e00abc3 1357#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1358
1359/*
1360 * Read data off the transport. This can be either an RPC_CALL or an
1361 * RPC_REPLY. Relay the processing to helper functions.
1362 */
1363static void xs_tcp_read_data(struct rpc_xprt *xprt,
1364 struct xdr_skb_reader *desc)
1365{
1366 struct sock_xprt *transport =
1367 container_of(xprt, struct sock_xprt, xprt);
1368
1369 if (_xs_tcp_read_data(xprt, desc) == 0)
1370 xs_tcp_check_fraghdr(transport);
1371 else {
1372 /*
1373 * The transport_lock protects the request handling.
1374 * There's no need to hold it to update the tcp_flags.
1375 */
1376 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1377 }
a246b010
CL		 1378}
1379
dd456471 1380static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1381{
1382 size_t len;
1383
51971139 1384 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1385 if (len > desc->count)
1386 len = desc->count;
1387 desc->count -= len;
1388 desc->offset += len;
51971139 1389 transport->tcp_offset += len;
46121cf7 1390 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1391 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1392}
1393
9903cd1c 1394static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1395{
1396 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1397 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1398 struct xdr_skb_reader desc = {
a246b010
CL		 1399 .skb = skb,
1400 .offset = offset,
1401 .count = len,
9903cd1c 1402 };
a246b010 1403
46121cf7 1404 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1405 do {
1406 /* Read in a new fragment marker if necessary */
1407 /* Can we ever really expect to get completely empty fragments? */
e136d092 1408 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1409 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1410 continue;
1411 }
1412 /* Read in the xid if necessary */
e136d092 1413 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1414 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1415 continue;
1416 }
18dca02a 1417 /* Read in the call/reply flag */
f4a2e418 1418 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1419 xs_tcp_read_calldir(transport, &desc);
1420 continue;
1421 }
a246b010 1422 /* Read in the request data */
e136d092 1423 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1424 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1425 continue;
1426 }
1427 /* Skip over any trailing bytes on short reads */
51971139 1428 xs_tcp_read_discard(transport, &desc);
a246b010 1429 } while (desc.count);
46121cf7 1430 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1431 return len - desc.count;
1432}
1433
9903cd1c
CL		 1434/**
1435 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1436 * @sk: socket with data to read
1437 * @bytes: how much data to read
1438 *
1439 */
676d2369 1440static void xs_tcp_data_ready(struct sock *sk)
a246b010
CL		 1441{
1442 struct rpc_xprt *xprt;
1443 read_descriptor_t rd_desc;
ff2d7db8 1444 int read;
a246b010 1445
46121cf7
CL		 1446 dprintk("RPC: xs_tcp_data_ready...\n");
1447
f064af1e 1448 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1449 if (!(xprt = xprt_from_sock(sk)))
a246b010 1450 goto out;
61d0a8e6
NB		 1451 /* Any data means we had a useful conversation, so
1452 * the we don't need to delay the next reconnect
1453 */
1454 if (xprt->reestablish_timeout)
1455 xprt->reestablish_timeout = 0;
1456
9903cd1c 1457 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1458 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1459 do {
1460 rd_desc.count = 65536;
1461 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1462 } while (read > 0);
a246b010 1463out:
f064af1e 1464 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1465}
1466
7d1e8255
TM		 1467/*
1468 * Do the equivalent of linger/linger2 handling for dealing with
1469 * broken servers that don't close the socket in a timely
1470 * fashion
1471 */
1472static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1473 unsigned long timeout)
1474{
1475 struct sock_xprt *transport;
1476
1477 if (xprt_test_and_set_connecting(xprt))
1478 return;
1479 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1480 transport = container_of(xprt, struct sock_xprt, xprt);
1481 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1482 timeout);
1483}
1484
1485static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1486{
1487 struct sock_xprt *transport;
1488
1489 transport = container_of(xprt, struct sock_xprt, xprt);
1490
1491 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1492 !cancel_delayed_work(&transport->connect_worker))
1493 return;
1494 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1495 xprt_clear_connecting(xprt);
1496}
1497
4bc1e68e 1498static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
7d1e8255 1499{
4e857c58 1500 smp_mb__before_atomic();
a519fc7a
TM		 1501 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1502 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1503 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1504 clear_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1505 smp_mb__after_atomic();
4bc1e68e
TM		 1506}
1507
1508static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1509{
1510 xs_sock_reset_connection_flags(xprt);
7d1e8255
TM		 1511 /* Mark transport as closed and wake up all pending tasks */
1512 xprt_disconnect_done(xprt);
1513}
1514
9903cd1c
CL		 1515/**
1516 * xs_tcp_state_change - callback to handle TCP socket state changes
1517 * @sk: socket whose state has changed
1518 *
1519 */
1520static void xs_tcp_state_change(struct sock *sk)
a246b010 1521{
9903cd1c 1522 struct rpc_xprt *xprt;
a246b010 1523
f064af1e 1524 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1525 if (!(xprt = xprt_from_sock(sk)))
1526 goto out;
46121cf7 1527 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1528 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1529 sk->sk_state, xprt_connected(xprt),
1530 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1531 sock_flag(sk, SOCK_ZAPPED),
1532 sk->sk_shutdown);
a246b010 1533
40b5ea0c 1534 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1535 switch (sk->sk_state) {
1536 case TCP_ESTABLISHED:
f064af1e 1537 spin_lock(&xprt->transport_lock);
a246b010 1538 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1539 struct sock_xprt *transport = container_of(xprt,
1540 struct sock_xprt, xprt);
1541
a246b010 1542 /* Reset TCP record info */
51971139
CL		 1543 transport->tcp_offset = 0;
1544 transport->tcp_reclen = 0;
1545 transport->tcp_copied = 0;
e136d092
CL		 1546 transport->tcp_flags =
1547 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
8b71798c 1548 xprt->connect_cookie++;
51971139 1549
2a491991 1550 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1551 }
f064af1e 1552 spin_unlock(&xprt->transport_lock);
a246b010 1553 break;
3b948ae5
TM		 1554 case TCP_FIN_WAIT1:
1555 /* The client initiated a shutdown of the socket */
7c1d71cf 1556 xprt->connect_cookie++;
663b8858 1557 xprt->reestablish_timeout = 0;
3b948ae5 1558 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1559 smp_mb__before_atomic();
3b948ae5 1560 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1561 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
4e857c58 1562 smp_mb__after_atomic();
25fe6142 1563 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1564 break;
632e3bdc 1565 case TCP_CLOSE_WAIT:
3b948ae5 1566 /* The server initiated a shutdown of the socket */
7c1d71cf 1567 xprt->connect_cookie++;
d0bea455 1568 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1569 xs_tcp_force_close(xprt);
663b8858
TM		 1570 case TCP_CLOSING:
1571 /*
1572 * If the server closed down the connection, make sure that
1573 * we back off before reconnecting
1574 */
1575 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1576 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1577 break;
1578 case TCP_LAST_ACK:
670f9457 1579 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1580 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
4e857c58 1581 smp_mb__before_atomic();
3b948ae5 1582 clear_bit(XPRT_CONNECTED, &xprt->state);
4e857c58 1583 smp_mb__after_atomic();
3b948ae5
TM		 1584 break;
1585 case TCP_CLOSE:
7d1e8255
TM		 1586 xs_tcp_cancel_linger_timeout(xprt);
1587 xs_sock_mark_closed(xprt);
a246b010
CL		 1588 }
1589 out:
f064af1e 1590 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1591}
1592
1f0fa154
IJ		 1593static void xs_write_space(struct sock *sk)
1594{
1595 struct socket *sock;
1596 struct rpc_xprt *xprt;
1597
1598 if (unlikely(!(sock = sk->sk_socket)))
1599 return;
1600 clear_bit(SOCK_NOSPACE, &sock->flags);
1601
1602 if (unlikely(!(xprt = xprt_from_sock(sk))))
1603 return;
1604 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1605 return;
1606
1607 xprt_write_space(xprt);
1608}
1609
9903cd1c 1610/**
c7b2cae8
CL		 1611 * xs_udp_write_space - callback invoked when socket buffer space
1612 * becomes available
9903cd1c
CL		 1613 * @sk: socket whose state has changed
1614 *
a246b010
CL		 1615 * Called when more output buffer space is available for this socket.
1616 * We try not to wake our writers until they can make "significant"
c7b2cae8 1617 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1618 * with a bunch of small requests.
1619 */
c7b2cae8 1620static void xs_udp_write_space(struct sock *sk)
a246b010 1621{
f064af1e 1622 read_lock_bh(&sk->sk_callback_lock);
a246b010 1623
c7b2cae8 1624 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1625 if (sock_writeable(sk))
1626 xs_write_space(sk);
a246b010 1627
f064af1e 1628 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1629}
a246b010 1630
c7b2cae8
CL		 1631/**
1632 * xs_tcp_write_space - callback invoked when socket buffer space
1633 * becomes available
1634 * @sk: socket whose state has changed
1635 *
1636 * Called when more output buffer space is available for this socket.
1637 * We try not to wake our writers until they can make "significant"
1638 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1639 * with a bunch of small requests.
1640 */
1641static void xs_tcp_write_space(struct sock *sk)
1642{
f064af1e 1643 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1644
1645 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1646 if (sk_stream_is_writeable(sk))
1f0fa154 1647 xs_write_space(sk);
b6ddf64f 1648
f064af1e 1649 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1650}
1651
470056c2 1652static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1653{
ee0ac0c2
CL		 1654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1655 struct sock *sk = transport->inet;
a246b010 1656
7c6e066e 1657 if (transport->rcvsize) {
a246b010 1658 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1659 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1660 }
7c6e066e 1661 if (transport->sndsize) {
a246b010 1662 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1663 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1664 sk->sk_write_space(sk);
1665 }
1666}
1667
43118c29 1668/**
470056c2 1669 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1670 * @xprt: generic transport
470056c2
CL		 1671 * @sndsize: requested size of send buffer, in bytes
1672 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1673 *
470056c2 1674 * Set socket send and receive buffer size limits.
43118c29 1675 */
470056c2 1676static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1677{
7c6e066e
CL		 1678 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1679
1680 transport->sndsize = 0;
470056c2 1681 if (sndsize)
7c6e066e
CL		 1682 transport->sndsize = sndsize + 1024;
1683 transport->rcvsize = 0;
470056c2 1684 if (rcvsize)
7c6e066e 1685 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1686
1687 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1688}
1689
46c0ee8b
CL		 1690/**
1691 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1692 * @task: task that timed out
1693 *
1694 * Adjust the congestion window after a retransmit timeout has occurred.
1695 */
6a24dfb6 1696static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1697{
6a24dfb6 1698 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
46c0ee8b
CL		 1699}
1700
b85d8806
CL		 1701static unsigned short xs_get_random_port(void)
1702{
1703 unsigned short range = xprt_max_resvport - xprt_min_resvport;
63862b5b 1704 unsigned short rand = (unsigned short) prandom_u32() % range;
b85d8806
CL		 1705 return rand + xprt_min_resvport;
1706}
1707
92200412
CL		 1708/**
1709 * xs_set_port - reset the port number in the remote endpoint address
1710 * @xprt: generic transport
1711 * @port: new port number
1712 *
1713 */
1714static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1715{
46121cf7 1716 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1717
9dc3b095
CL		 1718 rpc_set_port(xs_addr(xprt), port);
1719 xs_update_peer_port(xprt);
92200412
CL		 1720}
1721
5d4ec932 1722static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1723{
fbfffbd5 1724 unsigned short port = transport->srcport;
67a391d7
TM		 1725
1726 if (port == 0 && transport->xprt.resvport)
1727 port = xs_get_random_port();
1728 return port;
1729}
1730
baaf4e48 1731static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1732{
fbfffbd5
CL		 1733 if (transport->srcport != 0)
1734 transport->srcport = 0;
67a391d7
TM		 1735 if (!transport->xprt.resvport)
1736 return 0;
1737 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1738 return xprt_max_resvport;
1739 return --port;
1740}
beb59b68 1741static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1742{
beb59b68 1743 struct sockaddr_storage myaddr;
67a391d7 1744 int err, nloop = 0;
5d4ec932 1745 unsigned short port = xs_get_srcport(transport);
67a391d7 1746 unsigned short last;
a246b010 1747
beb59b68 1748 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1749 do {
beb59b68
PE		 1750 rpc_set_port((struct sockaddr *)&myaddr, port);
1751 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1752 transport->xprt.addrlen);
67a391d7 1753 if (port == 0)
d3bc9a1d 1754 break;
a246b010 1755 if (err == 0) {
fbfffbd5 1756 transport->srcport = port;
d3bc9a1d 1757 break;
a246b010 1758 }
67a391d7 1759 last = port;
baaf4e48 1760 port = xs_next_srcport(transport, port);
67a391d7
TM		 1761 if (port > last)
1762 nloop++;
1763 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1764
4232e863 1765 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1766 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1767 &((struct sockaddr_in *)&myaddr)->sin_addr,
1768 port, err ? "failed" : "ok", err);
1769 else
1770 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1771 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1772 port, err ? "failed" : "ok", err);
a246b010
CL		 1773 return err;
1774}
1775
176e21ee
CL		 1776/*
1777 * We don't support autobind on AF_LOCAL sockets
1778 */
1779static void xs_local_rpcbind(struct rpc_task *task)
1780{
3dc0da27
TM		 1781 rcu_read_lock();
1782 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1783 rcu_read_unlock();
176e21ee
CL		 1784}
1785
1786static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1787{
1788}
beb59b68 1789
ed07536e
PZ		 1790#ifdef CONFIG_DEBUG_LOCK_ALLOC
1791static struct lock_class_key xs_key[2];
1792static struct lock_class_key xs_slock_key[2];
1793
176e21ee
CL		 1794static inline void xs_reclassify_socketu(struct socket *sock)
1795{
1796 struct sock *sk = sock->sk;
1797
176e21ee
CL		 1798 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1799 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1800}
1801
8945ee5e 1802static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1803{
1804 struct sock *sk = sock->sk;
8945ee5e 1805
8945ee5e
CL		 1806 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1807 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1808}
ed07536e 1809
8945ee5e
CL		 1810static inline void xs_reclassify_socket6(struct socket *sock)
1811{
1812 struct sock *sk = sock->sk;
ed07536e 1813
8945ee5e
CL		 1814 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1815 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1816}
6bc9638a
PE		 1817
1818static inline void xs_reclassify_socket(int family, struct socket *sock)
1819{
1b7a1819
WAA		 1820 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1821 if (sock_owned_by_user(sock->sk))
1822 return;
1823
4232e863 1824 switch (family) {
176e21ee
CL		 1825 case AF_LOCAL:
1826 xs_reclassify_socketu(sock);
1827 break;
4232e863 1828 case AF_INET:
6bc9638a 1829 xs_reclassify_socket4(sock);
4232e863
CL		 1830 break;
1831 case AF_INET6:
6bc9638a 1832 xs_reclassify_socket6(sock);
4232e863
CL		 1833 break;
1834 }
6bc9638a 1835}
ed07536e 1836#else
176e21ee
CL		 1837static inline void xs_reclassify_socketu(struct socket *sock)
1838{
1839}
1840
8945ee5e
CL		 1841static inline void xs_reclassify_socket4(struct socket *sock)
1842{
1843}
1844
1845static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1846{
1847}
6bc9638a
PE		 1848
1849static inline void xs_reclassify_socket(int family, struct socket *sock)
1850{
1851}
ed07536e
PZ		 1852#endif
1853
93dc41bd
N		 1854static void xs_dummy_setup_socket(struct work_struct *work)
1855{
1856}
1857
6bc9638a
PE		 1858static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1859 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1860{
1861 struct socket *sock;
1862 int err;
1863
6bc9638a 1864 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1865 if (err < 0) {
1866 dprintk("RPC: can't create %d transport socket (%d).\n",
1867 protocol, -err);
1868 goto out;
1869 }
6bc9638a 1870 xs_reclassify_socket(family, sock);
22f79326 1871
4cea288a
BH		 1872 err = xs_bind(transport, sock);
1873 if (err) {
22f79326
PE		 1874 sock_release(sock);
1875 goto out;
1876 }
1877
1878 return sock;
1879out:
1880 return ERR_PTR(err);
1881}
1882
176e21ee
CL		 1883static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1884 struct socket *sock)
1885{
1886 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1887 xprt);
1888
1889 if (!transport->inet) {
1890 struct sock *sk = sock->sk;
1891
1892 write_lock_bh(&sk->sk_callback_lock);
1893
1894 xs_save_old_callbacks(transport, sk);
1895
1896 sk->sk_user_data = xprt;
1897 sk->sk_data_ready = xs_local_data_ready;
1898 sk->sk_write_space = xs_udp_write_space;
2118071d 1899 sk->sk_error_report = xs_error_report;
176e21ee
CL		 1900 sk->sk_allocation = GFP_ATOMIC;
1901
1902 xprt_clear_connected(xprt);
1903
1904 /* Reset to new socket */
1905 transport->sock = sock;
1906 transport->inet = sk;
1907
1908 write_unlock_bh(&sk->sk_callback_lock);
1909 }
1910
1911 /* Tell the socket layer to start connecting... */
1912 xprt->stat.connect_count++;
1913 xprt->stat.connect_start = jiffies;
1914 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1915}
1916
1917/**
1918 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1919 * @xprt: RPC transport to connect
1920 * @transport: socket transport to connect
1921 * @create_sock: function to create a socket of the correct type
176e21ee 1922 */
dc107402 1923static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1924{
176e21ee
CL		 1925 struct rpc_xprt *xprt = &transport->xprt;
1926 struct socket *sock;
1927 int status = -EIO;
1928
5cf02d09
JL		 1929 current->flags |= PF_FSTRANS;
1930
176e21ee
CL		 1931 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1932 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1933 SOCK_STREAM, 0, &sock, 1);
1934 if (status < 0) {
1935 dprintk("RPC: can't create AF_LOCAL "
1936 "transport socket (%d).\n", -status);
1937 goto out;
1938 }
1939 xs_reclassify_socketu(sock);
1940
1941 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1942 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1943
1944 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 1945 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 1946 switch (status) {
1947 case 0:
1948 dprintk("RPC: xprt %p connected to %s\n",
1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1950 xprt_set_connected(xprt);
1951 break;
1952 case -ENOENT:
1953 dprintk("RPC: xprt %p: socket %s does not exist\n",
1954 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1955 break;
4a20a988
TM		 1956 case -ECONNREFUSED:
1957 dprintk("RPC: xprt %p: connection refused for %s\n",
1958 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1959 break;
176e21ee
CL		 1960 default:
1961 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1962 __func__, -status,
1963 xprt->address_strings[RPC_DISPLAY_ADDR]);
1964 }
1965
1966out:
1967 xprt_clear_connecting(xprt);
1968 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1969 current->flags &= ~PF_FSTRANS;
dc107402
BF		 1970 return status;
1971}
1972
b6669737 1973static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1974{
dc107402
BF		 1975 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1976 int ret;
1977
1978 if (RPC_IS_ASYNC(task)) {
1979 /*
1980 * We want the AF_LOCAL connect to be resolved in the
1981 * filesystem namespace of the process making the rpc
1982 * call. Thus we connect synchronously.
1983 *
1984 * If we want to support asynchronous AF_LOCAL calls,
1985 * we'll need to figure out how to pass a namespace to
1986 * connect.
1987 */
1988 rpc_exit(task, -ENOTCONN);
1989 return;
1990 }
1991 ret = xs_local_setup_socket(transport);
1992 if (ret && !RPC_IS_SOFTCONN(task))
1993 msleep_interruptible(15000);
176e21ee
CL		 1994}
1995
a564b8f0
MG		 1996#ifdef CONFIG_SUNRPC_SWAP
1997static void xs_set_memalloc(struct rpc_xprt *xprt)
1998{
1999 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2000 xprt);
2001
2002 if (xprt->swapper)
2003 sk_set_memalloc(transport->inet);
2004}
2005
2006/**
2007 * xs_swapper - Tag this transport as being used for swap.
2008 * @xprt: transport to tag
2009 * @enable: enable/disable
2010 *
2011 */
2012int xs_swapper(struct rpc_xprt *xprt, int enable)
2013{
2014 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2015 xprt);
2016 int err = 0;
2017
2018 if (enable) {
2019 xprt->swapper++;
2020 xs_set_memalloc(xprt);
2021 } else if (xprt->swapper) {
2022 xprt->swapper--;
2023 sk_clear_memalloc(transport->inet);
2024 }
2025
2026 return err;
2027}
2028EXPORT_SYMBOL_GPL(xs_swapper);
2029#else
2030static void xs_set_memalloc(struct rpc_xprt *xprt)
2031{
2032}
2033#endif
2034
16be2d20
CL		 2035static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2036{
2037 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2038
2039 if (!transport->inet) {
2040 struct sock *sk = sock->sk;
2041
2042 write_lock_bh(&sk->sk_callback_lock);
2043
2a9e1cfa
TM		 2044 xs_save_old_callbacks(transport, sk);
2045
16be2d20 2046 sk->sk_user_data = xprt;
16be2d20
CL		 2047 sk->sk_data_ready = xs_udp_data_ready;
2048 sk->sk_write_space = xs_udp_write_space;
2049 sk->sk_no_check = UDP_CSUM_NORCV;
2050 sk->sk_allocation = GFP_ATOMIC;
2051
2052 xprt_set_connected(xprt);
2053
2054 /* Reset to new socket */
2055 transport->sock = sock;
2056 transport->inet = sk;
2057
a564b8f0
MG		 2058 xs_set_memalloc(xprt);
2059
16be2d20
CL		 2060 write_unlock_bh(&sk->sk_callback_lock);
2061 }
2062 xs_udp_do_set_buffer_size(xprt);
2063}
2064
8c14ff2a 2065static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2066{
34161db6
TM		 2067 struct sock_xprt *transport =
2068 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2069 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2070 struct socket *sock = transport->sock;
b65c0310 2071 int status = -EIO;
9903cd1c 2072
5cf02d09
JL		 2073 current->flags |= PF_FSTRANS;
2074
b0d93ad5 2075 /* Start by resetting any existing state */
fe315e76 2076 xs_reset_transport(transport);
8c14ff2a
PE		 2077 sock = xs_create_sock(xprt, transport,
2078 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2079 if (IS_ERR(sock))
b0d93ad5 2080 goto out;
68e220bd 2081
c740eff8
CL		 2082 dprintk("RPC: worker connecting xprt %p via %s to "
2083 "%s (port %s)\n", xprt,
2084 xprt->address_strings[RPC_DISPLAY_PROTO],
2085 xprt->address_strings[RPC_DISPLAY_ADDR],
2086 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2087
2088 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2089 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2090 status = 0;
2091out:
b0d93ad5 2092 xprt_clear_connecting(xprt);
7d1e8255 2093 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2094 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2095}
2096
3167e12c
CL		 2097/*
2098 * We need to preserve the port number so the reply cache on the server can
2099 * find our cached RPC replies when we get around to reconnecting.
2100 */
58dddac9 2101static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2102{
2103 int result;
3167e12c
CL		 2104 struct sockaddr any;
2105
58dddac9 2106 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2107
2108 /*
2109 * Disconnect the transport socket by doing a connect operation
2110 * with AF_UNSPEC. This should return immediately...
2111 */
2112 memset(&any, 0, sizeof(any));
2113 any.sa_family = AF_UNSPEC;
ee0ac0c2 2114 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
40b5ea0c
TM		 2115 trace_rpc_socket_reset_connection(&transport->xprt,
2116 transport->sock, result);
7d1e8255 2117 if (!result)
4bc1e68e
TM		 2118 xs_sock_reset_connection_flags(&transport->xprt);
2119 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
3167e12c
CL		 2120}
2121
58dddac9 2122static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2123{
2124 unsigned int state = transport->inet->sk_state;
2125
669502ff
AC		 2126 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2127 /* we don't need to abort the connection if the socket
2128 * hasn't undergone a shutdown
2129 */
2130 if (transport->inet->sk_shutdown == 0)
2131 return;
2132 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2133 __func__, transport->inet->sk_shutdown);
2134 }
2135 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2136 /* we don't need to abort the connection if the socket
2137 * hasn't undergone a shutdown
2138 */
2139 if (transport->inet->sk_shutdown == 0)
2140 return;
2141 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2142 "sk_shutdown set to %d\n",
2143 __func__, transport->inet->sk_shutdown);
2144 }
58dddac9 2145 xs_abort_connection(transport);
40d2549d
TM		 2146}
2147
16be2d20 2148static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2149{
16be2d20 2150 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2151 int ret = -ENOTCONN;
edb267a6 2152
ee0ac0c2 2153 if (!transport->inet) {
b0d93ad5 2154 struct sock *sk = sock->sk;
7f260e85
TM		 2155 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2156 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2157 unsigned int opt_on = 1;
2158
2159 /* TCP Keepalive options */
2160 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2161 (char *)&opt_on, sizeof(opt_on));
2162 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2163 (char *)&keepidle, sizeof(keepidle));
2164 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2165 (char *)&keepidle, sizeof(keepidle));
2166 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2167 (char *)&keepcnt, sizeof(keepcnt));
b0d93ad5
CL		 2168
2169 write_lock_bh(&sk->sk_callback_lock);
2170
2a9e1cfa
TM		 2171 xs_save_old_callbacks(transport, sk);
2172
b0d93ad5 2173 sk->sk_user_data = xprt;
b0d93ad5
CL		 2174 sk->sk_data_ready = xs_tcp_data_ready;
2175 sk->sk_state_change = xs_tcp_state_change;
2176 sk->sk_write_space = xs_tcp_write_space;
2118071d 2177 sk->sk_error_report = xs_error_report;
b079fa7b 2178 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2179
2180 /* socket options */
2181 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2182 sock_reset_flag(sk, SOCK_LINGER);
2183 tcp_sk(sk)->linger2 = 0;
2184 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2185
2186 xprt_clear_connected(xprt);
2187
2188 /* Reset to new socket */
ee0ac0c2
CL		 2189 transport->sock = sock;
2190 transport->inet = sk;
b0d93ad5
CL		 2191
2192 write_unlock_bh(&sk->sk_callback_lock);
2193 }
2194
01d37c42 2195 if (!xprt_bound(xprt))
fe19a96b 2196 goto out;
01d37c42 2197
a564b8f0
MG		 2198 xs_set_memalloc(xprt);
2199
b0d93ad5 2200 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2201 xprt->stat.connect_count++;
2202 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2203 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2204 switch (ret) {
2205 case 0:
2206 case -EINPROGRESS:
2207 /* SYN_SENT! */
fe19a96b
TM		 2208 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2209 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2210 }
2211out:
2212 return ret;
16be2d20
CL		 2213}
2214
9903cd1c 2215/**
b61d59ff
TM		 2216 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2217 * @xprt: RPC transport to connect
2218 * @transport: socket transport to connect
2219 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2220 *
2221 * Invoked by a work queue tasklet.
a246b010 2222 */
cdd518d5 2223static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2224{
cdd518d5
PE		 2225 struct sock_xprt *transport =
2226 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2227 struct socket *sock = transport->sock;
a9f5f0f7 2228 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2229 int status = -EIO;
a246b010 2230
5cf02d09
JL		 2231 current->flags |= PF_FSTRANS;
2232
ee0ac0c2 2233 if (!sock) {
7d1e8255 2234 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2235 sock = xs_create_sock(xprt, transport,
2236 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2237 if (IS_ERR(sock)) {
2238 status = PTR_ERR(sock);
3167e12c
CL		 2239 goto out;
2240 }
7d1e8255
TM		 2241 } else {
2242 int abort_and_exit;
a246b010 2243
7d1e8255
TM		 2244 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2245 &xprt->state);
3167e12c 2246 /* "close" the socket, preserving the local port */
58dddac9 2247 xs_tcp_reuse_connection(transport);
a246b010 2248
7d1e8255
TM		 2249 if (abort_and_exit)
2250 goto out_eagain;
2251 }
a246b010 2252
c740eff8
CL		 2253 dprintk("RPC: worker connecting xprt %p via %s to "
2254 "%s (port %s)\n", xprt,
2255 xprt->address_strings[RPC_DISPLAY_PROTO],
2256 xprt->address_strings[RPC_DISPLAY_ADDR],
2257 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2258
16be2d20 2259 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2260 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2261 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2262 xprt, -status, xprt_connected(xprt),
2263 sock->sk->sk_state);
2a491991 2264 switch (status) {
f75e6745
TM		 2265 default:
2266 printk("%s: connect returned unhandled error %d\n",
2267 __func__, status);
2268 case -EADDRNOTAVAIL:
2269 /* We're probably in TIME_WAIT. Get rid of existing socket,
2270 * and retry
2271 */
a519fc7a 2272 xs_tcp_force_close(xprt);
88b5ed73 2273 break;
2a491991
TM		 2274 case 0:
2275 case -EINPROGRESS:
2276 case -EALREADY:
7d1e8255 2277 xprt_clear_connecting(xprt);
5cf02d09 2278 current->flags &= ~PF_FSTRANS;
7d1e8255 2279 return;
9fcfe0c8
TM		 2280 case -EINVAL:
2281 /* Happens, for instance, if the user specified a link
2282 * local IPv6 address without a scope-id.
2283 */
3ed5e2a2
TM		 2284 case -ECONNREFUSED:
2285 case -ECONNRESET:
2286 case -ENETUNREACH:
2287 /* retry with existing socket, after a delay */
9fcfe0c8 2288 goto out;
a246b010 2289 }
7d1e8255 2290out_eagain:
2a491991 2291 status = -EAGAIN;
a246b010 2292out:
68e220bd 2293 xprt_clear_connecting(xprt);
7d1e8255 2294 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2295 current->flags &= ~PF_FSTRANS;
68e220bd 2296}
b0d93ad5 2297
9903cd1c
CL		 2298/**
2299 * xs_connect - connect a socket to a remote endpoint
1b092092 2300 * @xprt: pointer to transport structure
9903cd1c
CL		 2301 * @task: address of RPC task that manages state of connect request
2302 *
2303 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2304 *
2305 * UDP socket connects are synchronous, but we use a work queue anyway
2306 * to guarantee that even unprivileged user processes can set up a
2307 * socket on a privileged port.
2308 *
2309 * If a UDP socket connect fails, the delay behavior here prevents
2310 * retry floods (hard mounts).
9903cd1c 2311 */
1b092092 2312static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2313{
ee0ac0c2 2314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2315
09a21c41 2316 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2317 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2318 "seconds\n",
03bf4b70 2319 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2320 queue_delayed_work(rpciod_workqueue,
2321 &transport->connect_worker,
2322 xprt->reestablish_timeout);
03bf4b70 2323 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2324 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2325 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2326 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2327 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2328 } else {
46121cf7 2329 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2330 queue_delayed_work(rpciod_workqueue,
2331 &transport->connect_worker, 0);
a246b010
CL		 2332 }
2333}
2334
176e21ee
CL		 2335/**
2336 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2337 * @xprt: rpc_xprt struct containing statistics
2338 * @seq: output file
2339 *
2340 */
2341static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2342{
2343 long idle_time = 0;
2344
2345 if (xprt_connected(xprt))
2346 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2347
2348 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2349 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2350 xprt->stat.bind_count,
2351 xprt->stat.connect_count,
2352 xprt->stat.connect_time,
2353 idle_time,
2354 xprt->stat.sends,
2355 xprt->stat.recvs,
2356 xprt->stat.bad_xids,
2357 xprt->stat.req_u,
15a45206
AA		 2358 xprt->stat.bklog_u,
2359 xprt->stat.max_slots,
2360 xprt->stat.sending_u,
2361 xprt->stat.pending_u);
176e21ee
CL		 2362}
2363
262ca07d
CL		 2364/**
2365 * xs_udp_print_stats - display UDP socket-specifc stats
2366 * @xprt: rpc_xprt struct containing statistics
2367 * @seq: output file
2368 *
2369 */
2370static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2371{
c8475461
CL		 2372 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2373
15a45206
AA		 2374 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2375 "%lu %llu %llu\n",
fbfffbd5 2376 transport->srcport,
262ca07d
CL		 2377 xprt->stat.bind_count,
2378 xprt->stat.sends,
2379 xprt->stat.recvs,
2380 xprt->stat.bad_xids,
2381 xprt->stat.req_u,
15a45206
AA		 2382 xprt->stat.bklog_u,
2383 xprt->stat.max_slots,
2384 xprt->stat.sending_u,
2385 xprt->stat.pending_u);
262ca07d
CL		 2386}
2387
2388/**
2389 * xs_tcp_print_stats - display TCP socket-specifc stats
2390 * @xprt: rpc_xprt struct containing statistics
2391 * @seq: output file
2392 *
2393 */
2394static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2395{
c8475461 2396 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2397 long idle_time = 0;
2398
2399 if (xprt_connected(xprt))
2400 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2401
15a45206
AA		 2402 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2403 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2404 transport->srcport,
262ca07d
CL		 2405 xprt->stat.bind_count,
2406 xprt->stat.connect_count,
2407 xprt->stat.connect_time,
2408 idle_time,
2409 xprt->stat.sends,
2410 xprt->stat.recvs,
2411 xprt->stat.bad_xids,
2412 xprt->stat.req_u,
15a45206
AA		 2413 xprt->stat.bklog_u,
2414 xprt->stat.max_slots,
2415 xprt->stat.sending_u,
2416 xprt->stat.pending_u);
262ca07d
CL		 2417}
2418
4cfc7e60
RI		 2419/*
2420 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2421 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2422 * to use the server side send routines.
2423 */
5a51f13a 2424static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2425{
2426 struct page *page;
2427 struct rpc_buffer *buf;
2428
b8a13d03
WAA		 2429 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2430 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2431 return NULL;
4cfc7e60 2432
b8a13d03 2433 page = alloc_page(GFP_KERNEL);
4cfc7e60
RI		 2434 if (!page)
2435 return NULL;
2436
2437 buf = page_address(page);
2438 buf->len = PAGE_SIZE;
2439
2440 return buf->data;
2441}
2442
2443/*
2444 * Free the space allocated in the bc_alloc routine
2445 */
5a51f13a 2446static void bc_free(void *buffer)
4cfc7e60
RI		 2447{
2448 struct rpc_buffer *buf;
2449
2450 if (!buffer)
2451 return;
2452
2453 buf = container_of(buffer, struct rpc_buffer, data);
2454 free_page((unsigned long)buf);
2455}
2456
2457/*
2458 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2459 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2460 */
2461static int bc_sendto(struct rpc_rqst *req)
2462{
2463 int len;
2464 struct xdr_buf *xbufp = &req->rq_snd_buf;
2465 struct rpc_xprt *xprt = req->rq_xprt;
2466 struct sock_xprt *transport =
2467 container_of(xprt, struct sock_xprt, xprt);
2468 struct socket *sock = transport->sock;
2469 unsigned long headoff;
2470 unsigned long tailoff;
2471
61677eee 2472 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2473
2474 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2475 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2476 len = svc_send_common(sock, xbufp,
2477 virt_to_page(xbufp->head[0].iov_base), headoff,
2478 xbufp->tail[0].iov_base, tailoff);
2479
2480 if (len != xbufp->len) {
2481 printk(KERN_NOTICE "Error sending entire callback!\n");
2482 len = -EAGAIN;
2483 }
2484
2485 return len;
2486}
2487
2488/*
2489 * The send routine. Borrows from svc_send
2490 */
2491static int bc_send_request(struct rpc_task *task)
2492{
2493 struct rpc_rqst *req = task->tk_rqstp;
2494 struct svc_xprt *xprt;
4cfc7e60
RI		 2495 u32 len;
2496
2497 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2498 /*
2499 * Get the server socket associated with this callback xprt
2500 */
2501 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2502
2503 /*
2504 * Grab the mutex to serialize data as the connection is shared
2505 * with the fore channel
2506 */
2507 if (!mutex_trylock(&xprt->xpt_mutex)) {
2508 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2509 if (!mutex_trylock(&xprt->xpt_mutex))
2510 return -EAGAIN;
2511 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2512 }
2513 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2514 len = -ENOTCONN;
2515 else
2516 len = bc_sendto(req);
2517 mutex_unlock(&xprt->xpt_mutex);
2518
2519 if (len > 0)
2520 len = 0;
2521
2522 return len;
2523}
2524
2525/*
2526 * The close routine. Since this is client initiated, we do nothing
2527 */
2528
2529static void bc_close(struct rpc_xprt *xprt)
2530{
4cfc7e60
RI		 2531}
2532
2533/*
2534 * The xprt destroy routine. Again, because this connection is client
2535 * initiated, we do nothing
2536 */
2537
2538static void bc_destroy(struct rpc_xprt *xprt)
2539{
47f72efa
KM		 2540 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2541
2542 xs_xprt_free(xprt);
2543 module_put(THIS_MODULE);
4cfc7e60
RI		 2544}
2545
176e21ee
CL		 2546static struct rpc_xprt_ops xs_local_ops = {
2547 .reserve_xprt = xprt_reserve_xprt,
2548 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2549 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2550 .rpcbind = xs_local_rpcbind,
2551 .set_port = xs_local_set_port,
dc107402 2552 .connect = xs_local_connect,
176e21ee
CL		 2553 .buf_alloc = rpc_malloc,
2554 .buf_free = rpc_free,
2555 .send_request = xs_local_send_request,
2556 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2557 .close = xs_close,
a1311d87 2558 .destroy = xs_destroy,
176e21ee
CL		 2559 .print_stats = xs_local_print_stats,
2560};
2561
262965f5 2562static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2563 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2564 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2565 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2566 .alloc_slot = xprt_alloc_slot,
45160d62 2567 .rpcbind = rpcb_getport_async,
92200412 2568 .set_port = xs_set_port,
262965f5 2569 .connect = xs_connect,
02107148
CL		 2570 .buf_alloc = rpc_malloc,
2571 .buf_free = rpc_free,
262965f5 2572 .send_request = xs_udp_send_request,
fe3aca29 2573 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2574 .timer = xs_udp_timer,
a58dd398 2575 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2576 .close = xs_close,
2577 .destroy = xs_destroy,
262ca07d 2578 .print_stats = xs_udp_print_stats,
262965f5
CL		 2579};
2580
2581static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2582 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2583 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2584 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2585 .rpcbind = rpcb_getport_async,
92200412 2586 .set_port = xs_set_port,
0b9e7943 2587 .connect = xs_connect,
02107148
CL		 2588 .buf_alloc = rpc_malloc,
2589 .buf_free = rpc_free,
262965f5 2590 .send_request = xs_tcp_send_request,
fe3aca29 2591 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2592 .close = xs_tcp_close,
9903cd1c 2593 .destroy = xs_destroy,
262ca07d 2594 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2595};
2596
4cfc7e60
RI		 2597/*
2598 * The rpc_xprt_ops for the server backchannel
2599 */
2600
2601static struct rpc_xprt_ops bc_tcp_ops = {
2602 .reserve_xprt = xprt_reserve_xprt,
2603 .release_xprt = xprt_release_xprt,
84e28a30 2604 .alloc_slot = xprt_alloc_slot,
4cfc7e60
RI		 2605 .buf_alloc = bc_malloc,
2606 .buf_free = bc_free,
2607 .send_request = bc_send_request,
2608 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2609 .close = bc_close,
2610 .destroy = bc_destroy,
2611 .print_stats = xs_tcp_print_stats,
2612};
2613
92476850
CL		 2614static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2615{
2616 static const struct sockaddr_in sin = {
2617 .sin_family = AF_INET,
2618 .sin_addr.s_addr = htonl(INADDR_ANY),
2619 };
2620 static const struct sockaddr_in6 sin6 = {
2621 .sin6_family = AF_INET6,
2622 .sin6_addr = IN6ADDR_ANY_INIT,
2623 };
2624
2625 switch (family) {
176e21ee
CL		 2626 case AF_LOCAL:
2627 break;
92476850
CL		 2628 case AF_INET:
2629 memcpy(sap, &sin, sizeof(sin));
2630 break;
2631 case AF_INET6:
2632 memcpy(sap, &sin6, sizeof(sin6));
2633 break;
2634 default:
2635 dprintk("RPC: %s: Bad address family\n", __func__);
2636 return -EAFNOSUPPORT;
2637 }
2638 return 0;
2639}
2640
3c341b0b 2641static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2642 unsigned int slot_table_size,
2643 unsigned int max_slot_table_size)
c8541ecd
CL		 2644{
2645 struct rpc_xprt *xprt;
ffc2e518 2646 struct sock_xprt *new;
c8541ecd 2647
96802a09 2648 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2649 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2650 return ERR_PTR(-EBADF);
2651 }
2652
d9ba131d
TM		 2653 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2654 max_slot_table_size);
bd1722d4 2655 if (xprt == NULL) {
46121cf7
CL		 2656 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2657 "rpc_xprt\n");
c8541ecd
CL		 2658 return ERR_PTR(-ENOMEM);
2659 }
c8541ecd 2660
bd1722d4 2661 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2662 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2663 xprt->addrlen = args->addrlen;
d3bc9a1d 2664 if (args->srcaddr)
fbfffbd5 2665 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2666 else {
2667 int err;
2668 err = xs_init_anyaddr(args->dstaddr->sa_family,
2669 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2670 if (err != 0) {
2671 xprt_free(xprt);
92476850 2672 return ERR_PTR(err);
2aa13531 2673 }
92476850 2674 }
c8541ecd
CL		 2675
2676 return xprt;
2677}
2678
176e21ee
CL		 2679static const struct rpc_timeout xs_local_default_timeout = {
2680 .to_initval = 10 * HZ,
2681 .to_maxval = 10 * HZ,
2682 .to_retries = 2,
2683};
2684
2685/**
2686 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2687 * @args: rpc transport creation arguments
2688 *
2689 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2690 */
2691static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2692{
2693 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2694 struct sock_xprt *transport;
2695 struct rpc_xprt *xprt;
2696 struct rpc_xprt *ret;
2697
d9ba131d
TM		 2698 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2699 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2700 if (IS_ERR(xprt))
2701 return xprt;
2702 transport = container_of(xprt, struct sock_xprt, xprt);
2703
2704 xprt->prot = 0;
2705 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2706 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2707
2708 xprt->bind_timeout = XS_BIND_TO;
2709 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2710 xprt->idle_timeout = XS_IDLE_DISC_TO;
2711
2712 xprt->ops = &xs_local_ops;
2713 xprt->timeout = &xs_local_default_timeout;
2714
93dc41bd
N		 2715 INIT_DELAYED_WORK(&transport->connect_worker,
2716 xs_dummy_setup_socket);
2717
176e21ee
CL		 2718 switch (sun->sun_family) {
2719 case AF_LOCAL:
2720 if (sun->sun_path[0] != '/') {
2721 dprintk("RPC: bad AF_LOCAL address: %s\n",
2722 sun->sun_path);
2723 ret = ERR_PTR(-EINVAL);
2724 goto out_err;
2725 }
2726 xprt_set_bound(xprt);
176e21ee 2727 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2728 ret = ERR_PTR(xs_local_setup_socket(transport));
2729 if (ret)
2730 goto out_err;
176e21ee
CL		 2731 break;
2732 default:
2733 ret = ERR_PTR(-EAFNOSUPPORT);
2734 goto out_err;
2735 }
2736
2737 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2738 xprt->address_strings[RPC_DISPLAY_ADDR]);
2739
2740 if (try_module_get(THIS_MODULE))
2741 return xprt;
2742 ret = ERR_PTR(-EINVAL);
2743out_err:
315f3812 2744 xs_xprt_free(xprt);
176e21ee
CL		 2745 return ret;
2746}
2747
2881ae74
TM		 2748static const struct rpc_timeout xs_udp_default_timeout = {
2749 .to_initval = 5 * HZ,
2750 .to_maxval = 30 * HZ,
2751 .to_increment = 5 * HZ,
2752 .to_retries = 5,
2753};
2754
9903cd1c
CL		 2755/**
2756 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2757 * @args: rpc transport creation arguments
9903cd1c
CL		 2758 *
2759 */
483066d6 2760static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2761{
8f9d5b1a 2762 struct sockaddr *addr = args->dstaddr;
c8541ecd 2763 struct rpc_xprt *xprt;
c8475461 2764 struct sock_xprt *transport;
0a68b0be 2765 struct rpc_xprt *ret;
a246b010 2766
d9ba131d
TM		 2767 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2768 xprt_udp_slot_table_entries);
c8541ecd
CL		 2769 if (IS_ERR(xprt))
2770 return xprt;
c8475461 2771 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2772
ec739ef0 2773 xprt->prot = IPPROTO_UDP;
808012fb 2774 xprt->tsh_size = 0;
a246b010
CL		 2775 /* XXX: header size can vary due to auth type, IPv6, etc. */
2776 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2777
03bf4b70 2778 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2779 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2780 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2781
262965f5 2782 xprt->ops = &xs_udp_ops;
a246b010 2783
ba7392bb 2784 xprt->timeout = &xs_udp_default_timeout;
a246b010 2785
8f9d5b1a
CL		 2786 switch (addr->sa_family) {
2787 case AF_INET:
2788 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2789 xprt_set_bound(xprt);
2790
2791 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2792 xs_udp_setup_socket);
9dc3b095 2793 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2794 break;
2795 case AF_INET6:
2796 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2797 xprt_set_bound(xprt);
2798
2799 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2800 xs_udp_setup_socket);
9dc3b095 2801 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2802 break;
2803 default:
0a68b0be
BF		 2804 ret = ERR_PTR(-EAFNOSUPPORT);
2805 goto out_err;
8f9d5b1a
CL		 2806 }
2807
c740eff8
CL		 2808 if (xprt_bound(xprt))
2809 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2810 xprt->address_strings[RPC_DISPLAY_ADDR],
2811 xprt->address_strings[RPC_DISPLAY_PORT],
2812 xprt->address_strings[RPC_DISPLAY_PROTO]);
2813 else
2814 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2815 xprt->address_strings[RPC_DISPLAY_ADDR],
2816 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2817
bc25571e
TT		 2818 if (try_module_get(THIS_MODULE))
2819 return xprt;
0a68b0be
BF		 2820 ret = ERR_PTR(-EINVAL);
2821out_err:
315f3812 2822 xs_xprt_free(xprt);
0a68b0be 2823 return ret;
a246b010
CL		 2824}
2825
2881ae74
TM		 2826static const struct rpc_timeout xs_tcp_default_timeout = {
2827 .to_initval = 60 * HZ,
2828 .to_maxval = 60 * HZ,
2829 .to_retries = 2,
2830};
2831
9903cd1c
CL		 2832/**
2833 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2834 * @args: rpc transport creation arguments
9903cd1c
CL		 2835 *
2836 */
483066d6 2837static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2838{
8f9d5b1a 2839 struct sockaddr *addr = args->dstaddr;
c8541ecd 2840 struct rpc_xprt *xprt;
c8475461 2841 struct sock_xprt *transport;
0a68b0be 2842 struct rpc_xprt *ret;
b7993ceb
TM		 2843 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2844
2845 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2846 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 2847
d9ba131d 2848 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 2849 max_slot_table_size);
c8541ecd
CL		 2850 if (IS_ERR(xprt))
2851 return xprt;
c8475461 2852 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2853
ec739ef0 2854 xprt->prot = IPPROTO_TCP;
808012fb 2855 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2856 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2857
03bf4b70 2858 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2859 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2860 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2861
262965f5 2862 xprt->ops = &xs_tcp_ops;
ba7392bb 2863 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2864
8f9d5b1a
CL		 2865 switch (addr->sa_family) {
2866 case AF_INET:
2867 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2868 xprt_set_bound(xprt);
2869
9dc3b095 2870 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2871 xs_tcp_setup_socket);
9dc3b095 2872 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2873 break;
2874 case AF_INET6:
2875 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2876 xprt_set_bound(xprt);
2877
9dc3b095 2878 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2879 xs_tcp_setup_socket);
9dc3b095 2880 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2881 break;
2882 default:
0a68b0be
BF		 2883 ret = ERR_PTR(-EAFNOSUPPORT);
2884 goto out_err;
8f9d5b1a
CL		 2885 }
2886
c740eff8
CL		 2887 if (xprt_bound(xprt))
2888 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2889 xprt->address_strings[RPC_DISPLAY_ADDR],
2890 xprt->address_strings[RPC_DISPLAY_PORT],
2891 xprt->address_strings[RPC_DISPLAY_PROTO]);
2892 else
2893 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2894 xprt->address_strings[RPC_DISPLAY_ADDR],
2895 xprt->address_strings[RPC_DISPLAY_PROTO]);
2896
bc25571e
TT		 2897 if (try_module_get(THIS_MODULE))
2898 return xprt;
0a68b0be
BF		 2899 ret = ERR_PTR(-EINVAL);
2900out_err:
315f3812 2901 xs_xprt_free(xprt);
0a68b0be 2902 return ret;
a246b010 2903}
282b32e1 2904
f300baba
AB		 2905/**
2906 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2907 * @args: rpc transport creation arguments
2908 *
2909 */
2910static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2911{
2912 struct sockaddr *addr = args->dstaddr;
2913 struct rpc_xprt *xprt;
2914 struct sock_xprt *transport;
2915 struct svc_sock *bc_sock;
0a68b0be 2916 struct rpc_xprt *ret;
f300baba 2917
d9ba131d
TM		 2918 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2919 xprt_tcp_slot_table_entries);
f300baba
AB		 2920 if (IS_ERR(xprt))
2921 return xprt;
2922 transport = container_of(xprt, struct sock_xprt, xprt);
2923
2924 xprt->prot = IPPROTO_TCP;
2925 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2926 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2927 xprt->timeout = &xs_tcp_default_timeout;
2928
2929 /* backchannel */
2930 xprt_set_bound(xprt);
2931 xprt->bind_timeout = 0;
f300baba
AB		 2932 xprt->reestablish_timeout = 0;
2933 xprt->idle_timeout = 0;
2934
f300baba
AB		 2935 xprt->ops = &bc_tcp_ops;
2936
2937 switch (addr->sa_family) {
2938 case AF_INET:
2939 xs_format_peer_addresses(xprt, "tcp",
2940 RPCBIND_NETID_TCP);
2941 break;
2942 case AF_INET6:
2943 xs_format_peer_addresses(xprt, "tcp",
2944 RPCBIND_NETID_TCP6);
2945 break;
2946 default:
0a68b0be
BF		 2947 ret = ERR_PTR(-EAFNOSUPPORT);
2948 goto out_err;
f300baba
AB		 2949 }
2950
50fa0d40
PE		 2951 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2952 xprt->address_strings[RPC_DISPLAY_ADDR],
2953 xprt->address_strings[RPC_DISPLAY_PORT],
2954 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2955
99de8ea9
BF		 2956 /*
2957 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 2958 * we want to keep it around as long as the connection lasts,
2959 * in case we need to start using it for a backchannel again;
2960 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 2961 */
2962 xprt_get(xprt);
2963 args->bc_xprt->xpt_bc_xprt = xprt;
2964 xprt->bc_xprt = args->bc_xprt;
2965 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2966 transport->sock = bc_sock->sk_sock;
2967 transport->inet = bc_sock->sk_sk;
2968
f300baba
AB		 2969 /*
2970 * Since we don't want connections for the backchannel, we set
2971 * the xprt status to connected
2972 */
2973 xprt_set_connected(xprt);
2974
f300baba
AB		 2975 if (try_module_get(THIS_MODULE))
2976 return xprt;
642aab58
KM		 2977
2978 args->bc_xprt->xpt_bc_xprt = NULL;
99de8ea9 2979 xprt_put(xprt);
0a68b0be
BF		 2980 ret = ERR_PTR(-EINVAL);
2981out_err:
315f3812 2982 xs_xprt_free(xprt);
0a68b0be 2983 return ret;
f300baba
AB		 2984}
2985
176e21ee
CL		 2986static struct xprt_class xs_local_transport = {
2987 .list = LIST_HEAD_INIT(xs_local_transport.list),
2988 .name = "named UNIX socket",
2989 .owner = THIS_MODULE,
2990 .ident = XPRT_TRANSPORT_LOCAL,
2991 .setup = xs_setup_local,
2992};
2993
bc25571e
TT		 2994static struct xprt_class xs_udp_transport = {
2995 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2996 .name = "udp",
2997 .owner = THIS_MODULE,
f300baba 2998 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2999 .setup = xs_setup_udp,
3000};
3001
3002static struct xprt_class xs_tcp_transport = {
3003 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3004 .name = "tcp",
3005 .owner = THIS_MODULE,
f300baba 3006 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 3007 .setup = xs_setup_tcp,
3008};
3009
f300baba
AB		 3010static struct xprt_class xs_bc_tcp_transport = {
3011 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3012 .name = "tcp NFSv4.1 backchannel",
3013 .owner = THIS_MODULE,
3014 .ident = XPRT_TRANSPORT_BC_TCP,
3015 .setup = xs_setup_bc_tcp,
3016};
3017
282b32e1 3018/**
bc25571e 3019 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 3020 *
3021 */
3022int init_socket_xprt(void)
3023{
fbf76683 3024#ifdef RPC_DEBUG
2b1bec5f 3025 if (!sunrpc_table_header)
0b4d4147 3026 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 3027#endif
3028
176e21ee 3029 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 3030 xprt_register_transport(&xs_udp_transport);
3031 xprt_register_transport(&xs_tcp_transport);
f300baba 3032 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 3033
282b32e1
CL		 3034 return 0;
3035}
3036
3037/**
bc25571e 3038 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 3039 *
3040 */
3041void cleanup_socket_xprt(void)
3042{
fbf76683
CL		 3043#ifdef RPC_DEBUG
3044 if (sunrpc_table_header) {
3045 unregister_sysctl_table(sunrpc_table_header);
3046 sunrpc_table_header = NULL;
3047 }
3048#endif
bc25571e 3049
176e21ee 3050 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 3051 xprt_unregister_transport(&xs_udp_transport);
3052 xprt_unregister_transport(&xs_tcp_transport);
f300baba 3053 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 3054}
cbf11071 3055
9bbb9e5a
RR		 3056static int param_set_uint_minmax(const char *val,
3057 const struct kernel_param *kp,
cbf11071
TM		 3058 unsigned int min, unsigned int max)
3059{
3060 unsigned long num;
3061 int ret;
3062
3063 if (!val)
3064 return -EINVAL;
3065 ret = strict_strtoul(val, 0, &num);
3066 if (ret == -EINVAL || num < min || num > max)
3067 return -EINVAL;
3068 *((unsigned int *)kp->arg) = num;
3069 return 0;
3070}
3071
9bbb9e5a 3072static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 3073{
3074 return param_set_uint_minmax(val, kp,
3075 RPC_MIN_RESVPORT,
3076 RPC_MAX_RESVPORT);
3077}
3078
9bbb9e5a
RR		 3079static struct kernel_param_ops param_ops_portnr = {
3080 .set = param_set_portnr,
3081 .get = param_get_uint,
3082};
3083
cbf11071
TM		 3084#define param_check_portnr(name, p) \
3085 __param_check(name, p, unsigned int);
3086
3087module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3088module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3089
9bbb9e5a
RR		 3090static int param_set_slot_table_size(const char *val,
3091 const struct kernel_param *kp)
cbf11071
TM		 3092{
3093 return param_set_uint_minmax(val, kp,
3094 RPC_MIN_SLOT_TABLE,
3095 RPC_MAX_SLOT_TABLE);
3096}
3097
9bbb9e5a
RR		 3098static struct kernel_param_ops param_ops_slot_table_size = {
3099 .set = param_set_slot_table_size,
3100 .get = param_get_uint,
3101};
3102
cbf11071
TM		 3103#define param_check_slot_table_size(name, p) \
3104 __param_check(name, p, unsigned int);
3105
d9ba131d
TM		 3106static int param_set_max_slot_table_size(const char *val,
3107 const struct kernel_param *kp)
3108{
3109 return param_set_uint_minmax(val, kp,
3110 RPC_MIN_SLOT_TABLE,
3111 RPC_MAX_SLOT_TABLE_LIMIT);
3112}
3113
3114static struct kernel_param_ops param_ops_max_slot_table_size = {
3115 .set = param_set_max_slot_table_size,
3116 .get = param_get_uint,
3117};
3118
3119#define param_check_max_slot_table_size(name, p) \
3120 __param_check(name, p, unsigned int);
3121
cbf11071
TM		 3122module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3123 slot_table_size, 0644);
d9ba131d
TM		 3124module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3125 max_slot_table_size, 0644);
cbf11071
TM		 3126module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3127 slot_table_size, 0644);
3128
Linux kernel - Deliverables
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