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Revert "SUNRPC: Ensure we close the socket on EPIPE errors too..."
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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>
02107148 36#include <linux/sunrpc/sched.h>
4cfc7e60 37#include <linux/sunrpc/svcsock.h>
49c36fcc 38#include <linux/sunrpc/xprtsock.h>
a246b010 39#include <linux/file.h>
9e00abc3 40#ifdef CONFIG_SUNRPC_BACKCHANNEL
44b98efd
RL		 41#include <linux/sunrpc/bc_xprt.h>
42#endif
a246b010
CL		 43
44#include <net/sock.h>
45#include <net/checksum.h>
46#include <net/udp.h>
47#include <net/tcp.h>
48
4cfc7e60 49#include "sunrpc.h"
176e21ee
CL		 50
51static void xs_close(struct rpc_xprt *xprt);
52
c556b754
CL		 53/*
54 * xprtsock tunables
55 */
09acfea5
TM		 56static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
57static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
58static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 59
09acfea5
TM		 60static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
61static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 62
7d1e8255 63#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 64static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 65
fbf76683
CL		 66/*
67 * We can register our own files under /proc/sys/sunrpc by
68 * calling register_sysctl_table() again. The files in that
69 * directory become the union of all files registered there.
70 *
71 * We simply need to make sure that we don't collide with
72 * someone else's file names!
73 */
74
75#ifdef RPC_DEBUG
76
77static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
78static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 79static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 80static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
81static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
82
83static struct ctl_table_header *sunrpc_table_header;
84
85/*
86 * FIXME: changing the UDP slot table size should also resize the UDP
87 * socket buffers for existing UDP transports
88 */
89static ctl_table xs_tunables_table[] = {
90 {
fbf76683
CL		 91 .procname = "udp_slot_table_entries",
92 .data = &xprt_udp_slot_table_entries,
93 .maxlen = sizeof(unsigned int),
94 .mode = 0644,
6d456111 95 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 96 .extra1 = &min_slot_table_size,
97 .extra2 = &max_slot_table_size
98 },
99 {
fbf76683
CL		 100 .procname = "tcp_slot_table_entries",
101 .data = &xprt_tcp_slot_table_entries,
102 .maxlen = sizeof(unsigned int),
103 .mode = 0644,
6d456111 104 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 105 .extra1 = &min_slot_table_size,
106 .extra2 = &max_slot_table_size
107 },
d9ba131d
TM		 108 {
109 .procname = "tcp_max_slot_table_entries",
110 .data = &xprt_max_tcp_slot_table_entries,
111 .maxlen = sizeof(unsigned int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_minmax,
114 .extra1 = &min_slot_table_size,
115 .extra2 = &max_tcp_slot_table_limit
116 },
fbf76683 117 {
fbf76683
CL		 118 .procname = "min_resvport",
119 .data = &xprt_min_resvport,
120 .maxlen = sizeof(unsigned int),
121 .mode = 0644,
6d456111 122 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 123 .extra1 = &xprt_min_resvport_limit,
124 .extra2 = &xprt_max_resvport_limit
125 },
126 {
fbf76683
CL		 127 .procname = "max_resvport",
128 .data = &xprt_max_resvport,
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
6d456111 131 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 132 .extra1 = &xprt_min_resvport_limit,
133 .extra2 = &xprt_max_resvport_limit
134 },
25fe6142
TM		 135 {
136 .procname = "tcp_fin_timeout",
137 .data = &xs_tcp_fin_timeout,
138 .maxlen = sizeof(xs_tcp_fin_timeout),
139 .mode = 0644,
6d456111 140 .proc_handler = proc_dointvec_jiffies,
fbf76683 141 },
f8572d8f 142 { },
fbf76683
CL		 143};
144
145static ctl_table sunrpc_table[] = {
146 {
fbf76683
CL		 147 .procname = "sunrpc",
148 .mode = 0555,
149 .child = xs_tunables_table
150 },
f8572d8f 151 { },
fbf76683
CL		 152};
153
154#endif
155
03bf4b70
CL		 156/*
157 * Wait duration for a reply from the RPC portmapper.
158 */
159#define XS_BIND_TO (60U * HZ)
160
161/*
162 * Delay if a UDP socket connect error occurs. This is most likely some
163 * kind of resource problem on the local host.
164 */
165#define XS_UDP_REEST_TO (2U * HZ)
166
167/*
168 * The reestablish timeout allows clients to delay for a bit before attempting
169 * to reconnect to a server that just dropped our connection.
170 *
171 * We implement an exponential backoff when trying to reestablish a TCP
172 * transport connection with the server. Some servers like to drop a TCP
173 * connection when they are overworked, so we start with a short timeout and
174 * increase over time if the server is down or not responding.
175 */
176#define XS_TCP_INIT_REEST_TO (3U * HZ)
177#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178
179/*
180 * TCP idle timeout; client drops the transport socket if it is idle
181 * for this long. Note that we also timeout UDP sockets to prevent
182 * holding port numbers when there is no RPC traffic.
183 */
184#define XS_IDLE_DISC_TO (5U * 60 * HZ)
185
a246b010
CL		 186#ifdef RPC_DEBUG
187# undef RPC_DEBUG_DATA
9903cd1c 188# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 189#endif
190
a246b010 191#ifdef RPC_DEBUG_DATA
9903cd1c 192static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 193{
9903cd1c
CL		 194 u8 *buf = (u8 *) packet;
195 int j;
a246b010 196
46121cf7 197 dprintk("RPC: %s\n", msg);
a246b010
CL		 198 for (j = 0; j < count && j < 128; j += 4) {
199 if (!(j & 31)) {
200 if (j)
201 dprintk("\n");
202 dprintk("0x%04x ", j);
203 }
204 dprintk("%02x%02x%02x%02x ",
205 buf[j], buf[j+1], buf[j+2], buf[j+3]);
206 }
207 dprintk("\n");
208}
209#else
9903cd1c 210static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 211{
212 /* NOP */
213}
214#endif
215
ffc2e518
CL		 216struct sock_xprt {
217 struct rpc_xprt xprt;
ee0ac0c2
CL		 218
219 /*
220 * Network layer
221 */
222 struct socket * sock;
223 struct sock * inet;
51971139
CL		 224
225 /*
226 * State of TCP reply receive
227 */
228 __be32 tcp_fraghdr,
b76ce561
TM		 229 tcp_xid,
230 tcp_calldir;
51971139
CL		 231
232 u32 tcp_offset,
233 tcp_reclen;
234
235 unsigned long tcp_copied,
236 tcp_flags;
c8475461
CL		 237
238 /*
239 * Connection of transports
240 */
34161db6 241 struct delayed_work connect_worker;
fbfffbd5
CL		 242 struct sockaddr_storage srcaddr;
243 unsigned short srcport;
7c6e066e
CL		 244
245 /*
246 * UDP socket buffer size parameters
247 */
248 size_t rcvsize,
249 sndsize;
314dfd79
CL		 250
251 /*
252 * Saved socket callback addresses
253 */
254 void (*old_data_ready)(struct sock *, int);
255 void (*old_state_change)(struct sock *);
256 void (*old_write_space)(struct sock *);
2a9e1cfa 257 void (*old_error_report)(struct sock *);
ffc2e518
CL		 258};
259
e136d092
CL		 260/*
261 * TCP receive state flags
262 */
263#define TCP_RCV_LAST_FRAG (1UL << 0)
264#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265#define TCP_RCV_COPY_XID (1UL << 2)
266#define TCP_RCV_COPY_DATA (1UL << 3)
f4a2e418
RL		 267#define TCP_RCV_READ_CALLDIR (1UL << 4)
268#define TCP_RCV_COPY_CALLDIR (1UL << 5)
18dca02a
RL		 269
270/*
271 * TCP RPC flags
272 */
f4a2e418 273#define TCP_RPC_REPLY (1UL << 6)
e136d092 274
95392c59
CL		 275static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276{
277 return (struct sockaddr *) &xprt->addr;
278}
279
176e21ee
CL		 280static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281{
282 return (struct sockaddr_un *) &xprt->addr;
283}
284
95392c59 285static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 286{
95392c59
CL		 287 return (struct sockaddr_in *) &xprt->addr;
288}
289
290static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291{
292 return (struct sockaddr_in6 *) &xprt->addr;
293}
294
c877b849 295static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 296{
c877b849 297 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
176e21ee 300 struct sockaddr_un *sun;
c877b849 301 char buf[128];
edb267a6 302
9dc3b095 303 switch (sap->sa_family) {
176e21ee
CL		 304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
9dc3b095 310 case AF_INET:
176e21ee
CL		 311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
9dc3b095 314 sin = xs_addr_in(xprt);
fc0b5791 315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 316 break;
317 case AF_INET6:
176e21ee
CL		 318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
9dc3b095 321 sin6 = xs_addr_in6(xprt);
fc0b5791 322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 323 break;
324 default:
325 BUG();
756805e7 326 }
176e21ee 327
9dc3b095 328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 329}
330
9dc3b095 331static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 332{
9dc3b095
CL		 333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
4b6473fb 335
81160e66 336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 338
81160e66 339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341}
4b6473fb 342
9dc3b095
CL		 343static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
c877b849 346{
b454ae90 347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 349 xs_format_common_peer_addresses(xprt);
9dc3b095 350 xs_format_common_peer_ports(xprt);
edb267a6 351}
4b6473fb 352
9dc3b095 353static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 354{
9dc3b095
CL		 355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 357
9dc3b095 358 xs_format_common_peer_ports(xprt);
edb267a6
CL		 359}
360
361static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362{
33e01dc7
CL		 363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
edb267a6
CL		 373}
374
b4b5cc85
CL		 375#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
24c5684b 377static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 378{
b4b5cc85
CL		 379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
24c5684b
TM		 382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 387 };
388
24c5684b 389 if (iov.iov_len != 0)
b4b5cc85
CL		 390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392}
393
24c5684b 394static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
b4b5cc85 395{
24c5684b
TM		 396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 407
24c5684b
TM		 408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
b4b5cc85
CL		 423}
424
9903cd1c
CL		 425/**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
a246b010 433 */
24c5684b 434static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
a246b010 435{
24c5684b
TM		 436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
a246b010 438
262965f5 439 if (unlikely(!sock))
fba91afb 440 return -ENOTSOCK;
262965f5
CL		 441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
262965f5 447
24c5684b
TM		 448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
a246b010 453 goto out;
24c5684b 454 sent += err;
a246b010
CL		 455 base = 0;
456 } else
24c5684b 457 base -= xdr->head[0].iov_len;
a246b010 458
24c5684b
TM		 459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
a246b010 464 goto out;
24c5684b 465 sent += err;
a246b010 466 base = 0;
24c5684b
TM		 467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 473out:
24c5684b
TM		 474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
a246b010
CL		 479}
480
b6ddf64f
TM		 481static void xs_nospace_callback(struct rpc_task *task)
482{
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487}
488
9903cd1c 489/**
262965f5
CL		 490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
9903cd1c 492 *
a246b010 493 */
5e3771ce 494static int xs_nospace(struct rpc_task *task)
a246b010 495{
262965f5
CL		 496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
24ca9a84 499 int ret = -EAGAIN;
a246b010 500
46121cf7 501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
b6ddf64f
TM		 505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 /*
512 * Notify TCP that we're limited by the application
513 * window size
514 */
515 set_bit(SOCK_NOSPACE, &transport->sock->flags);
516 transport->inet->sk_write_pending++;
517 /* ...and wait for more buffer space */
518 xprt_wait_for_buffer_space(task, xs_nospace_callback);
519 }
520 } else {
521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 522 ret = -ENOTCONN;
b6ddf64f 523 }
262965f5 524
b6ddf64f 525 spin_unlock_bh(&xprt->transport_lock);
5e3771ce 526 return ret;
262965f5
CL		 527}
528
61677eee
CL		 529/*
530 * Construct a stream transport record marker in @buf.
531 */
532static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
533{
534 u32 reclen = buf->len - sizeof(rpc_fraghdr);
535 rpc_fraghdr *base = buf->head[0].iov_base;
536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
537}
538
176e21ee
CL		 539/**
540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
541 * @task: RPC task that manages the state of an RPC request
542 *
543 * Return values:
544 * 0: The request has been sent
545 * EAGAIN: The socket was blocked, please call again later to
546 * complete the request
547 * ENOTCONN: Caller needs to invoke connect logic then call again
548 * other: Some other error occured, the request was not sent
549 */
550static int xs_local_send_request(struct rpc_task *task)
551{
552 struct rpc_rqst *req = task->tk_rqstp;
553 struct rpc_xprt *xprt = req->rq_xprt;
554 struct sock_xprt *transport =
555 container_of(xprt, struct sock_xprt, xprt);
556 struct xdr_buf *xdr = &req->rq_snd_buf;
557 int status;
558
559 xs_encode_stream_record_marker(&req->rq_snd_buf);
560
561 xs_pktdump("packet data:",
562 req->rq_svec->iov_base, req->rq_svec->iov_len);
563
564 status = xs_sendpages(transport->sock, NULL, 0,
565 xdr, req->rq_bytes_sent);
566 dprintk("RPC: %s(%u) = %d\n",
567 __func__, xdr->len - req->rq_bytes_sent, status);
568 if (likely(status >= 0)) {
569 req->rq_bytes_sent += status;
570 req->rq_xmit_bytes_sent += status;
571 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
572 req->rq_bytes_sent = 0;
573 return 0;
574 }
575 status = -EAGAIN;
576 }
577
578 switch (status) {
579 case -EAGAIN:
580 status = xs_nospace(task);
581 break;
582 default:
583 dprintk("RPC: sendmsg returned unrecognized error %d\n",
584 -status);
585 case -EPIPE:
586 xs_close(xprt);
587 status = -ENOTCONN;
588 }
589
590 return status;
591}
592
262965f5
CL		 593/**
594 * xs_udp_send_request - write an RPC request to a UDP socket
595 * @task: address of RPC task that manages the state of an RPC request
596 *
597 * Return values:
598 * 0: The request has been sent
599 * EAGAIN: The socket was blocked, please call again later to
600 * complete the request
601 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 602 * other: Some other error occurred, the request was not sent
262965f5
CL		 603 */
604static int xs_udp_send_request(struct rpc_task *task)
605{
606 struct rpc_rqst *req = task->tk_rqstp;
607 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5
CL		 609 struct xdr_buf *xdr = &req->rq_snd_buf;
610 int status;
a246b010 611
9903cd1c 612 xs_pktdump("packet data:",
a246b010
CL		 613 req->rq_svec->iov_base,
614 req->rq_svec->iov_len);
615
01d37c42
TM		 616 if (!xprt_bound(xprt))
617 return -ENOTCONN;
ee0ac0c2 618 status = xs_sendpages(transport->sock,
95392c59 619 xs_addr(xprt),
ee0ac0c2
CL		 620 xprt->addrlen, xdr,
621 req->rq_bytes_sent);
a246b010 622
46121cf7 623 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 624 xdr->len - req->rq_bytes_sent, status);
a246b010 625
2199700f 626 if (status >= 0) {
d60dbb20 627 req->rq_xmit_bytes_sent += status;
2199700f
TM		 628 if (status >= req->rq_slen)
629 return 0;
630 /* Still some bytes left; set up for a retry later. */
262965f5 631 status = -EAGAIN;
2199700f 632 }
a246b010 633
262965f5 634 switch (status) {
fba91afb
TM		 635 case -ENOTSOCK:
636 status = -ENOTCONN;
637 /* Should we call xs_close() here? */
638 break;
b6ddf64f 639 case -EAGAIN:
5e3771ce 640 status = xs_nospace(task);
b6ddf64f 641 break;
c8485e4d
TM		 642 default:
643 dprintk("RPC: sendmsg returned unrecognized error %d\n",
644 -status);
262965f5
CL		 645 case -ENETUNREACH:
646 case -EPIPE:
a246b010
CL		 647 case -ECONNREFUSED:
648 /* When the server has died, an ICMP port unreachable message
9903cd1c 649 * prompts ECONNREFUSED. */
b6ddf64f 650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 651 }
5fe46e9d 652
262965f5 653 return status;
a246b010
CL		 654}
655
e06799f9
TM		 656/**
657 * xs_tcp_shutdown - gracefully shut down a TCP socket
658 * @xprt: transport
659 *
660 * Initiates a graceful shutdown of the TCP socket by calling the
661 * equivalent of shutdown(SHUT_WR);
662 */
663static void xs_tcp_shutdown(struct rpc_xprt *xprt)
664{
665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
666 struct socket *sock = transport->sock;
667
668 if (sock != NULL)
669 kernel_sock_shutdown(sock, SHUT_WR);
670}
671
9903cd1c 672/**
262965f5 673 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 674 * @task: address of RPC task that manages the state of an RPC request
675 *
676 * Return values:
262965f5
CL		 677 * 0: The request has been sent
678 * EAGAIN: The socket was blocked, please call again later to
679 * complete the request
680 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 681 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 682 *
683 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 684 * if sendmsg is not able to make progress?
9903cd1c 685 */
262965f5 686static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 687{
688 struct rpc_rqst *req = task->tk_rqstp;
689 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 691 struct xdr_buf *xdr = &req->rq_snd_buf;
b595bb15 692 int status;
a246b010 693
61677eee 694 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 695
262965f5
CL		 696 xs_pktdump("packet data:",
697 req->rq_svec->iov_base,
698 req->rq_svec->iov_len);
a246b010
CL		 699
700 /* Continue transmitting the packet/record. We must be careful
701 * to cope with writespace callbacks arriving _after_ we have
262965f5 702 * called sendmsg(). */
a246b010 703 while (1) {
ee0ac0c2
CL		 704 status = xs_sendpages(transport->sock,
705 NULL, 0, xdr, req->rq_bytes_sent);
a246b010 706
46121cf7 707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 708 xdr->len - req->rq_bytes_sent, status);
a246b010 709
262965f5 710 if (unlikely(status < 0))
a246b010 711 break;
a246b010 712
262965f5
CL		 713 /* If we've sent the entire packet, immediately
714 * reset the count of bytes sent. */
715 req->rq_bytes_sent += status;
d60dbb20 716 req->rq_xmit_bytes_sent += status;
262965f5
CL		 717 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
718 req->rq_bytes_sent = 0;
719 return 0;
720 }
a246b010 721
06b4b681
TM		 722 if (status != 0)
723 continue;
a246b010 724 status = -EAGAIN;
06b4b681 725 break;
a246b010
CL		 726 }
727
262965f5 728 switch (status) {
fba91afb
TM		 729 case -ENOTSOCK:
730 status = -ENOTCONN;
731 /* Should we call xs_close() here? */
732 break;
262965f5 733 case -EAGAIN:
5e3771ce 734 status = xs_nospace(task);
262965f5 735 break;
c8485e4d
TM		 736 default:
737 dprintk("RPC: sendmsg returned unrecognized error %d\n",
738 -status);
262965f5 739 case -ECONNRESET:
2a9e1cfa
TM		 740 xs_tcp_shutdown(xprt);
741 case -ECONNREFUSED:
262965f5 742 case -ENOTCONN:
b9d2bb2e 743 case -EPIPE:
b6ddf64f 744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 745 }
5fe46e9d 746
a246b010
CL		 747 return status;
748}
749
e0ab53de
TM		 750/**
751 * xs_tcp_release_xprt - clean up after a tcp transmission
752 * @xprt: transport
753 * @task: rpc task
754 *
755 * This cleans up if an error causes us to abort the transmission of a request.
756 * In this case, the socket may need to be reset in order to avoid confusing
757 * the server.
758 */
759static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
760{
761 struct rpc_rqst *req;
762
763 if (task != xprt->snd_task)
764 return;
765 if (task == NULL)
766 goto out_release;
767 req = task->tk_rqstp;
43cedbf0
TM		 768 if (req == NULL)
769 goto out_release;
e0ab53de
TM		 770 if (req->rq_bytes_sent == 0)
771 goto out_release;
772 if (req->rq_bytes_sent == req->rq_snd_buf.len)
773 goto out_release;
774 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
775out_release:
776 xprt_release_xprt(xprt, task);
777}
778
2a9e1cfa
TM		 779static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
780{
781 transport->old_data_ready = sk->sk_data_ready;
782 transport->old_state_change = sk->sk_state_change;
783 transport->old_write_space = sk->sk_write_space;
784 transport->old_error_report = sk->sk_error_report;
785}
786
787static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
788{
789 sk->sk_data_ready = transport->old_data_ready;
790 sk->sk_state_change = transport->old_state_change;
791 sk->sk_write_space = transport->old_write_space;
792 sk->sk_error_report = transport->old_error_report;
793}
794
fe315e76 795static void xs_reset_transport(struct sock_xprt *transport)
a246b010 796{
ee0ac0c2
CL		 797 struct socket *sock = transport->sock;
798 struct sock *sk = transport->inet;
a246b010 799
fe315e76
CL		 800 if (sk == NULL)
801 return;
9903cd1c 802
246408dc
TM		 803 transport->srcport = 0;
804
a246b010 805 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 806 transport->inet = NULL;
807 transport->sock = NULL;
a246b010 808
9903cd1c 809 sk->sk_user_data = NULL;
2a9e1cfa
TM		 810
811 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 812 write_unlock_bh(&sk->sk_callback_lock);
813
9903cd1c 814 sk->sk_no_check = 0;
a246b010
CL		 815
816 sock_release(sock);
fe315e76
CL		 817}
818
819/**
820 * xs_close - close a socket
821 * @xprt: transport
822 *
823 * This is used when all requests are complete; ie, no DRC state remains
824 * on the server we want to save.
f75e6745
TM		 825 *
826 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
827 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 828 */
829static void xs_close(struct rpc_xprt *xprt)
830{
831 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
832
833 dprintk("RPC: xs_close xprt %p\n", xprt);
834
835 xs_reset_transport(transport);
61d0a8e6 836 xprt->reestablish_timeout = 0;
fe315e76 837
632e3bdc 838 smp_mb__before_clear_bit();
7d1e8255 839 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 840 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 841 clear_bit(XPRT_CLOSING, &xprt->state);
632e3bdc 842 smp_mb__after_clear_bit();
62da3b24 843 xprt_disconnect_done(xprt);
a246b010
CL		 844}
845
f75e6745
TM		 846static void xs_tcp_close(struct rpc_xprt *xprt)
847{
848 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
849 xs_close(xprt);
850 else
851 xs_tcp_shutdown(xprt);
852}
853
9903cd1c
CL		 854/**
855 * xs_destroy - prepare to shutdown a transport
856 * @xprt: doomed transport
857 *
858 */
859static void xs_destroy(struct rpc_xprt *xprt)
a246b010 860{
c8475461
CL		 861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
862
46121cf7 863 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 864
afe2c511 865 cancel_delayed_work_sync(&transport->connect_worker);
a246b010 866
9903cd1c 867 xs_close(xprt);
edb267a6 868 xs_free_peer_addresses(xprt);
e204e621 869 xprt_free(xprt);
bc25571e 870 module_put(THIS_MODULE);
a246b010
CL		 871}
872
9903cd1c
CL		 873static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
874{
875 return (struct rpc_xprt *) sk->sk_user_data;
876}
877
176e21ee
CL		 878static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
879{
880 struct xdr_skb_reader desc = {
881 .skb = skb,
882 .offset = sizeof(rpc_fraghdr),
883 .count = skb->len - sizeof(rpc_fraghdr),
884 };
885
886 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
887 return -1;
888 if (desc.count)
889 return -1;
890 return 0;
891}
892
893/**
894 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
895 * @sk: socket with data to read
896 * @len: how much data to read
897 *
898 * Currently this assumes we can read the whole reply in a single gulp.
899 */
900static void xs_local_data_ready(struct sock *sk, int len)
901{
902 struct rpc_task *task;
903 struct rpc_xprt *xprt;
904 struct rpc_rqst *rovr;
905 struct sk_buff *skb;
906 int err, repsize, copied;
907 u32 _xid;
908 __be32 *xp;
909
910 read_lock_bh(&sk->sk_callback_lock);
911 dprintk("RPC: %s...\n", __func__);
912 xprt = xprt_from_sock(sk);
913 if (xprt == NULL)
914 goto out;
915
916 skb = skb_recv_datagram(sk, 0, 1, &err);
917 if (skb == NULL)
918 goto out;
919
176e21ee
CL		 920 repsize = skb->len - sizeof(rpc_fraghdr);
921 if (repsize < 4) {
922 dprintk("RPC: impossible RPC reply size %d\n", repsize);
923 goto dropit;
924 }
925
926 /* Copy the XID from the skb... */
927 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
928 if (xp == NULL)
929 goto dropit;
930
931 /* Look up and lock the request corresponding to the given XID */
932 spin_lock(&xprt->transport_lock);
933 rovr = xprt_lookup_rqst(xprt, *xp);
934 if (!rovr)
935 goto out_unlock;
936 task = rovr->rq_task;
937
938 copied = rovr->rq_private_buf.buflen;
939 if (copied > repsize)
940 copied = repsize;
941
942 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
943 dprintk("RPC: sk_buff copy failed\n");
944 goto out_unlock;
945 }
946
947 xprt_complete_rqst(task, copied);
948
949 out_unlock:
950 spin_unlock(&xprt->transport_lock);
951 dropit:
952 skb_free_datagram(sk, skb);
953 out:
954 read_unlock_bh(&sk->sk_callback_lock);
955}
956
9903cd1c
CL		 957/**
958 * xs_udp_data_ready - "data ready" callback for UDP sockets
959 * @sk: socket with data to read
960 * @len: how much data to read
961 *
a246b010 962 */
9903cd1c 963static void xs_udp_data_ready(struct sock *sk, int len)
a246b010 964{
9903cd1c
CL		 965 struct rpc_task *task;
966 struct rpc_xprt *xprt;
a246b010 967 struct rpc_rqst *rovr;
9903cd1c 968 struct sk_buff *skb;
a246b010 969 int err, repsize, copied;
d8ed029d
AD		 970 u32 _xid;
971 __be32 *xp;
a246b010 972
f064af1e 973 read_lock_bh(&sk->sk_callback_lock);
46121cf7 974 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 975 if (!(xprt = xprt_from_sock(sk)))
a246b010 976 goto out;
a246b010
CL		 977
978 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
979 goto out;
980
a246b010
CL		 981 repsize = skb->len - sizeof(struct udphdr);
982 if (repsize < 4) {
46121cf7 983 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 984 goto dropit;
985 }
986
987 /* Copy the XID from the skb... */
988 xp = skb_header_pointer(skb, sizeof(struct udphdr),
989 sizeof(_xid), &_xid);
990 if (xp == NULL)
991 goto dropit;
992
993 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 994 spin_lock(&xprt->transport_lock);
a246b010
CL		 995 rovr = xprt_lookup_rqst(xprt, *xp);
996 if (!rovr)
997 goto out_unlock;
998 task = rovr->rq_task;
999
a246b010
CL		 1000 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1001 copied = repsize;
1002
1003 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1004 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1005 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1006 goto out_unlock;
1781f7f5
HX		 1007 }
1008
1009 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1010
1570c1e4 1011 xprt_adjust_cwnd(task, copied);
1570c1e4 1012 xprt_complete_rqst(task, copied);
a246b010
CL		 1013
1014 out_unlock:
4a0f8c04 1015 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1016 dropit:
1017 skb_free_datagram(sk, skb);
1018 out:
f064af1e 1019 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1020}
1021
a519fc7a
TM		 1022/*
1023 * Helper function to force a TCP close if the server is sending
1024 * junk and/or it has put us in CLOSE_WAIT
1025 */
1026static void xs_tcp_force_close(struct rpc_xprt *xprt)
1027{
1028 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1029 xprt_force_disconnect(xprt);
1030}
1031
dd456471 1032static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1033{
51971139 1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1035 size_t len, used;
1036 char *p;
1037
51971139
CL		 1038 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1039 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1040 used = xdr_skb_read_bits(desc, p, len);
51971139 1041 transport->tcp_offset += used;
a246b010
CL		 1042 if (used != len)
1043 return;
808012fb 1044
51971139
CL		 1045 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1046 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1047 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1048 else
e136d092 1049 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1050 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1051
e136d092 1052 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1053 transport->tcp_offset = 0;
808012fb 1054
a246b010 1055 /* Sanity check of the record length */
18dca02a 1056 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1057 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1058 xs_tcp_force_close(xprt);
9903cd1c 1059 return;
a246b010 1060 }
46121cf7 1061 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1062 transport->tcp_reclen);
a246b010
CL		 1063}
1064
51971139 1065static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1066{
51971139 1067 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1068 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1069 transport->tcp_offset = 0;
e136d092
CL		 1070 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1071 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1072 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1073 transport->tcp_copied = 0;
a246b010
CL		 1074 }
1075 }
1076}
1077
dd456471 1078static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1079{
1080 size_t len, used;
1081 char *p;
1082
51971139 1083 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1084 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1085 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1086 used = xdr_skb_read_bits(desc, p, len);
51971139 1087 transport->tcp_offset += used;
a246b010
CL		 1088 if (used != len)
1089 return;
e136d092 1090 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1091 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1092 transport->tcp_copied = 4;
18dca02a
RL		 1093 dprintk("RPC: reading %s XID %08x\n",
1094 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1095 : "request with",
51971139
CL		 1096 ntohl(transport->tcp_xid));
1097 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1098}
1099
18dca02a
RL		 1100static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1101 struct xdr_skb_reader *desc)
a246b010 1102{
18dca02a
RL		 1103 size_t len, used;
1104 u32 offset;
b76ce561 1105 char *p;
18dca02a
RL		 1106
1107 /*
1108 * We want transport->tcp_offset to be 8 at the end of this routine
1109 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1110 * When this function is called for the first time,
1111 * transport->tcp_offset is 4 (after having already read the xid).
1112 */
1113 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1114 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1115 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1116 p = ((char *) &transport->tcp_calldir) + offset;
1117 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1118 transport->tcp_offset += used;
1119 if (used != len)
1120 return;
f4a2e418 1121 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1122 /*
1123 * We don't yet have the XDR buffer, so we will write the calldir
1124 * out after we get the buffer from the 'struct rpc_rqst'
1125 */
b76ce561
TM		 1126 switch (ntohl(transport->tcp_calldir)) {
1127 case RPC_REPLY:
1128 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1129 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1130 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1131 break;
1132 case RPC_CALL:
1133 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1134 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1135 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1136 break;
1137 default:
1138 dprintk("RPC: invalid request message type\n");
a519fc7a 1139 xs_tcp_force_close(&transport->xprt);
b76ce561 1140 }
18dca02a
RL		 1141 xs_tcp_check_fraghdr(transport);
1142}
1143
44b98efd
RL		 1144static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1145 struct xdr_skb_reader *desc,
1146 struct rpc_rqst *req)
a246b010 1147{
44b98efd
RL		 1148 struct sock_xprt *transport =
1149 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1150 struct xdr_buf *rcvbuf;
1151 size_t len;
1152 ssize_t r;
1153
a246b010 1154 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1155
1156 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1157 /*
1158 * Save the RPC direction in the XDR buffer
1159 */
f4a2e418 1160 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1161 &transport->tcp_calldir,
1162 sizeof(transport->tcp_calldir));
1163 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1164 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1165 }
1166
a246b010 1167 len = desc->count;
51971139 1168 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1169 struct xdr_skb_reader my_desc;
a246b010 1170
51971139 1171 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1172 memcpy(&my_desc, desc, sizeof(my_desc));
1173 my_desc.count = len;
51971139 1174 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1175 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1176 desc->count -= r;
1177 desc->offset += r;
1178 } else
51971139 1179 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1180 desc, xdr_skb_read_bits);
a246b010
CL		 1181
1182 if (r > 0) {
51971139
CL		 1183 transport->tcp_copied += r;
1184 transport->tcp_offset += r;
a246b010
CL		 1185 }
1186 if (r != len) {
1187 /* Error when copying to the receive buffer,
1188 * usually because we weren't able to allocate
1189 * additional buffer pages. All we can do now
e136d092 1190 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1191 * will not receive any additional updates,
1192 * and time out.
1193 * Any remaining data from this record will
1194 * be discarded.
1195 */
e136d092 1196 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1197 dprintk("RPC: XID %08x truncated request\n",
51971139 1198 ntohl(transport->tcp_xid));
46121cf7
CL		 1199 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1200 "tcp_offset = %u, tcp_reclen = %u\n",
1201 xprt, transport->tcp_copied,
1202 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1203 return;
a246b010
CL		 1204 }
1205
46121cf7 1206 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1207 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1208 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1209 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1210 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1211
1212 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1214 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1215 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1216 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1217 }
44b98efd
RL		 1218}
1219
1220/*
1221 * Finds the request corresponding to the RPC xid and invokes the common
1222 * tcp read code to read the data.
1223 */
1224static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1225 struct xdr_skb_reader *desc)
1226{
1227 struct sock_xprt *transport =
1228 container_of(xprt, struct sock_xprt, xprt);
1229 struct rpc_rqst *req;
1230
1231 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1232
1233 /* Find and lock the request corresponding to this xid */
1234 spin_lock(&xprt->transport_lock);
1235 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1236 if (!req) {
1237 dprintk("RPC: XID %08x request not found!\n",
1238 ntohl(transport->tcp_xid));
1239 spin_unlock(&xprt->transport_lock);
1240 return -1;
1241 }
1242
1243 xs_tcp_read_common(xprt, desc, req);
1244
e136d092 1245 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1246 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1247
4a0f8c04 1248 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1249 return 0;
1250}
1251
9e00abc3 1252#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1253/*
1254 * Obtains an rpc_rqst previously allocated and invokes the common
1255 * tcp read code to read the data. The result is placed in the callback
1256 * queue.
1257 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1258 * connection and return -1.
1259 */
1260static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1261 struct xdr_skb_reader *desc)
1262{
1263 struct sock_xprt *transport =
1264 container_of(xprt, struct sock_xprt, xprt);
1265 struct rpc_rqst *req;
1266
1267 req = xprt_alloc_bc_request(xprt);
1268 if (req == NULL) {
1269 printk(KERN_WARNING "Callback slot table overflowed\n");
1270 xprt_force_disconnect(xprt);
1271 return -1;
1272 }
1273
1274 req->rq_xid = transport->tcp_xid;
1275 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1276 xs_tcp_read_common(xprt, desc, req);
1277
1278 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1279 struct svc_serv *bc_serv = xprt->bc_serv;
1280
1281 /*
1282 * Add callback request to callback list. The callback
1283 * service sleeps on the sv_cb_waitq waiting for new
1284 * requests. Wake it up after adding enqueing the
1285 * request.
1286 */
1287 dprintk("RPC: add callback request to list\n");
1288 spin_lock(&bc_serv->sv_cb_lock);
1289 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1290 spin_unlock(&bc_serv->sv_cb_lock);
1291 wake_up(&bc_serv->sv_cb_waitq);
1292 }
1293
1294 req->rq_private_buf.len = transport->tcp_copied;
1295
1296 return 0;
1297}
1298
1299static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1300 struct xdr_skb_reader *desc)
1301{
1302 struct sock_xprt *transport =
1303 container_of(xprt, struct sock_xprt, xprt);
1304
1305 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1306 xs_tcp_read_reply(xprt, desc) :
1307 xs_tcp_read_callback(xprt, desc);
1308}
1309#else
1310static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1311 struct xdr_skb_reader *desc)
1312{
1313 return xs_tcp_read_reply(xprt, desc);
1314}
9e00abc3 1315#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1316
1317/*
1318 * Read data off the transport. This can be either an RPC_CALL or an
1319 * RPC_REPLY. Relay the processing to helper functions.
1320 */
1321static void xs_tcp_read_data(struct rpc_xprt *xprt,
1322 struct xdr_skb_reader *desc)
1323{
1324 struct sock_xprt *transport =
1325 container_of(xprt, struct sock_xprt, xprt);
1326
1327 if (_xs_tcp_read_data(xprt, desc) == 0)
1328 xs_tcp_check_fraghdr(transport);
1329 else {
1330 /*
1331 * The transport_lock protects the request handling.
1332 * There's no need to hold it to update the tcp_flags.
1333 */
1334 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1335 }
a246b010
CL		 1336}
1337
dd456471 1338static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1339{
1340 size_t len;
1341
51971139 1342 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1343 if (len > desc->count)
1344 len = desc->count;
1345 desc->count -= len;
1346 desc->offset += len;
51971139 1347 transport->tcp_offset += len;
46121cf7 1348 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1349 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1350}
1351
9903cd1c 1352static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1353{
1354 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1355 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1356 struct xdr_skb_reader desc = {
a246b010
CL		 1357 .skb = skb,
1358 .offset = offset,
1359 .count = len,
9903cd1c 1360 };
a246b010 1361
46121cf7 1362 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1363 do {
1364 /* Read in a new fragment marker if necessary */
1365 /* Can we ever really expect to get completely empty fragments? */
e136d092 1366 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1367 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1368 continue;
1369 }
1370 /* Read in the xid if necessary */
e136d092 1371 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1372 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1373 continue;
1374 }
18dca02a 1375 /* Read in the call/reply flag */
f4a2e418 1376 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1377 xs_tcp_read_calldir(transport, &desc);
1378 continue;
1379 }
a246b010 1380 /* Read in the request data */
e136d092 1381 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1382 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1383 continue;
1384 }
1385 /* Skip over any trailing bytes on short reads */
51971139 1386 xs_tcp_read_discard(transport, &desc);
a246b010 1387 } while (desc.count);
46121cf7 1388 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1389 return len - desc.count;
1390}
1391
9903cd1c
CL		 1392/**
1393 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1394 * @sk: socket with data to read
1395 * @bytes: how much data to read
1396 *
1397 */
1398static void xs_tcp_data_ready(struct sock *sk, int bytes)
a246b010
CL		 1399{
1400 struct rpc_xprt *xprt;
1401 read_descriptor_t rd_desc;
ff2d7db8 1402 int read;
a246b010 1403
46121cf7
CL		 1404 dprintk("RPC: xs_tcp_data_ready...\n");
1405
f064af1e 1406 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1407 if (!(xprt = xprt_from_sock(sk)))
a246b010 1408 goto out;
61d0a8e6
NB		 1409 /* Any data means we had a useful conversation, so
1410 * the we don't need to delay the next reconnect
1411 */
1412 if (xprt->reestablish_timeout)
1413 xprt->reestablish_timeout = 0;
1414
9903cd1c 1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1416 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1417 do {
1418 rd_desc.count = 65536;
1419 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1420 } while (read > 0);
a246b010 1421out:
f064af1e 1422 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1423}
1424
7d1e8255
TM		 1425/*
1426 * Do the equivalent of linger/linger2 handling for dealing with
1427 * broken servers that don't close the socket in a timely
1428 * fashion
1429 */
1430static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1431 unsigned long timeout)
1432{
1433 struct sock_xprt *transport;
1434
1435 if (xprt_test_and_set_connecting(xprt))
1436 return;
1437 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1438 transport = container_of(xprt, struct sock_xprt, xprt);
1439 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1440 timeout);
1441}
1442
1443static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1444{
1445 struct sock_xprt *transport;
1446
1447 transport = container_of(xprt, struct sock_xprt, xprt);
1448
1449 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1450 !cancel_delayed_work(&transport->connect_worker))
1451 return;
1452 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1453 xprt_clear_connecting(xprt);
1454}
1455
1456static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1457{
1458 smp_mb__before_clear_bit();
a519fc7a
TM		 1459 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1460 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1461 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1462 clear_bit(XPRT_CLOSING, &xprt->state);
1463 smp_mb__after_clear_bit();
1464 /* Mark transport as closed and wake up all pending tasks */
1465 xprt_disconnect_done(xprt);
1466}
1467
9903cd1c
CL		 1468/**
1469 * xs_tcp_state_change - callback to handle TCP socket state changes
1470 * @sk: socket whose state has changed
1471 *
1472 */
1473static void xs_tcp_state_change(struct sock *sk)
a246b010 1474{
9903cd1c 1475 struct rpc_xprt *xprt;
a246b010 1476
f064af1e 1477 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1478 if (!(xprt = xprt_from_sock(sk)))
1479 goto out;
46121cf7 1480 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1481 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1482 sk->sk_state, xprt_connected(xprt),
1483 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1484 sock_flag(sk, SOCK_ZAPPED),
1485 sk->sk_shutdown);
a246b010
CL		 1486
1487 switch (sk->sk_state) {
1488 case TCP_ESTABLISHED:
f064af1e 1489 spin_lock(&xprt->transport_lock);
a246b010 1490 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1491 struct sock_xprt *transport = container_of(xprt,
1492 struct sock_xprt, xprt);
1493
a246b010 1494 /* Reset TCP record info */
51971139
CL		 1495 transport->tcp_offset = 0;
1496 transport->tcp_reclen = 0;
1497 transport->tcp_copied = 0;
e136d092
CL		 1498 transport->tcp_flags =
1499 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
51971139 1500
2a491991 1501 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1502 }
f064af1e 1503 spin_unlock(&xprt->transport_lock);
a246b010 1504 break;
3b948ae5
TM		 1505 case TCP_FIN_WAIT1:
1506 /* The client initiated a shutdown of the socket */
7c1d71cf 1507 xprt->connect_cookie++;
663b8858 1508 xprt->reestablish_timeout = 0;
3b948ae5
TM		 1509 set_bit(XPRT_CLOSING, &xprt->state);
1510 smp_mb__before_clear_bit();
1511 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1512 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 1513 smp_mb__after_clear_bit();
25fe6142 1514 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1515 break;
632e3bdc 1516 case TCP_CLOSE_WAIT:
3b948ae5 1517 /* The server initiated a shutdown of the socket */
7c1d71cf 1518 xprt->connect_cookie++;
d0bea455 1519 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1520 xs_tcp_force_close(xprt);
663b8858
TM		 1521 case TCP_CLOSING:
1522 /*
1523 * If the server closed down the connection, make sure that
1524 * we back off before reconnecting
1525 */
1526 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1527 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1528 break;
1529 case TCP_LAST_ACK:
670f9457 1530 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1531 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1532 smp_mb__before_clear_bit();
1533 clear_bit(XPRT_CONNECTED, &xprt->state);
1534 smp_mb__after_clear_bit();
1535 break;
1536 case TCP_CLOSE:
7d1e8255
TM		 1537 xs_tcp_cancel_linger_timeout(xprt);
1538 xs_sock_mark_closed(xprt);
a246b010
CL		 1539 }
1540 out:
f064af1e 1541 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1542}
1543
2a9e1cfa 1544/**
482f32e6 1545 * xs_error_report - callback mainly for catching socket errors
2a9e1cfa
TM		 1546 * @sk: socket
1547 */
482f32e6 1548static void xs_error_report(struct sock *sk)
2a9e1cfa
TM		 1549{
1550 struct rpc_xprt *xprt;
1551
f064af1e 1552 read_lock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1553 if (!(xprt = xprt_from_sock(sk)))
1554 goto out;
1555 dprintk("RPC: %s client %p...\n"
1556 "RPC: error %d\n",
1557 __func__, xprt, sk->sk_err);
482f32e6 1558 xprt_wake_pending_tasks(xprt, -EAGAIN);
2a9e1cfa 1559out:
f064af1e 1560 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1561}
1562
1f0fa154
IJ		 1563static void xs_write_space(struct sock *sk)
1564{
1565 struct socket *sock;
1566 struct rpc_xprt *xprt;
1567
1568 if (unlikely(!(sock = sk->sk_socket)))
1569 return;
1570 clear_bit(SOCK_NOSPACE, &sock->flags);
1571
1572 if (unlikely(!(xprt = xprt_from_sock(sk))))
1573 return;
1574 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1575 return;
1576
1577 xprt_write_space(xprt);
1578}
1579
9903cd1c 1580/**
c7b2cae8
CL		 1581 * xs_udp_write_space - callback invoked when socket buffer space
1582 * becomes available
9903cd1c
CL		 1583 * @sk: socket whose state has changed
1584 *
a246b010
CL		 1585 * Called when more output buffer space is available for this socket.
1586 * We try not to wake our writers until they can make "significant"
c7b2cae8 1587 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1588 * with a bunch of small requests.
1589 */
c7b2cae8 1590static void xs_udp_write_space(struct sock *sk)
a246b010 1591{
f064af1e 1592 read_lock_bh(&sk->sk_callback_lock);
a246b010 1593
c7b2cae8 1594 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1595 if (sock_writeable(sk))
1596 xs_write_space(sk);
a246b010 1597
f064af1e 1598 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1599}
a246b010 1600
c7b2cae8
CL		 1601/**
1602 * xs_tcp_write_space - callback invoked when socket buffer space
1603 * becomes available
1604 * @sk: socket whose state has changed
1605 *
1606 * Called when more output buffer space is available for this socket.
1607 * We try not to wake our writers until they can make "significant"
1608 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1609 * with a bunch of small requests.
1610 */
1611static void xs_tcp_write_space(struct sock *sk)
1612{
f064af1e 1613 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1614
1615 /* from net/core/stream.c:sk_stream_write_space */
1f0fa154
IJ		 1616 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1617 xs_write_space(sk);
b6ddf64f 1618
f064af1e 1619 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1620}
1621
470056c2 1622static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1623{
ee0ac0c2
CL		 1624 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1625 struct sock *sk = transport->inet;
a246b010 1626
7c6e066e 1627 if (transport->rcvsize) {
a246b010 1628 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1629 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1630 }
7c6e066e 1631 if (transport->sndsize) {
a246b010 1632 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1633 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1634 sk->sk_write_space(sk);
1635 }
1636}
1637
43118c29 1638/**
470056c2 1639 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1640 * @xprt: generic transport
470056c2
CL		 1641 * @sndsize: requested size of send buffer, in bytes
1642 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1643 *
470056c2 1644 * Set socket send and receive buffer size limits.
43118c29 1645 */
470056c2 1646static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1647{
7c6e066e
CL		 1648 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1649
1650 transport->sndsize = 0;
470056c2 1651 if (sndsize)
7c6e066e
CL		 1652 transport->sndsize = sndsize + 1024;
1653 transport->rcvsize = 0;
470056c2 1654 if (rcvsize)
7c6e066e 1655 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1656
1657 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1658}
1659
46c0ee8b
CL		 1660/**
1661 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1662 * @task: task that timed out
1663 *
1664 * Adjust the congestion window after a retransmit timeout has occurred.
1665 */
1666static void xs_udp_timer(struct rpc_task *task)
1667{
1668 xprt_adjust_cwnd(task, -ETIMEDOUT);
1669}
1670
b85d8806
CL		 1671static unsigned short xs_get_random_port(void)
1672{
1673 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1674 unsigned short rand = (unsigned short) net_random() % range;
1675 return rand + xprt_min_resvport;
1676}
1677
92200412
CL		 1678/**
1679 * xs_set_port - reset the port number in the remote endpoint address
1680 * @xprt: generic transport
1681 * @port: new port number
1682 *
1683 */
1684static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1685{
46121cf7 1686 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1687
9dc3b095
CL		 1688 rpc_set_port(xs_addr(xprt), port);
1689 xs_update_peer_port(xprt);
92200412
CL		 1690}
1691
5d4ec932 1692static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1693{
fbfffbd5 1694 unsigned short port = transport->srcport;
67a391d7
TM		 1695
1696 if (port == 0 && transport->xprt.resvport)
1697 port = xs_get_random_port();
1698 return port;
1699}
1700
baaf4e48 1701static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1702{
fbfffbd5
CL		 1703 if (transport->srcport != 0)
1704 transport->srcport = 0;
67a391d7
TM		 1705 if (!transport->xprt.resvport)
1706 return 0;
1707 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1708 return xprt_max_resvport;
1709 return --port;
1710}
beb59b68 1711static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1712{
beb59b68 1713 struct sockaddr_storage myaddr;
67a391d7 1714 int err, nloop = 0;
5d4ec932 1715 unsigned short port = xs_get_srcport(transport);
67a391d7 1716 unsigned short last;
a246b010 1717
beb59b68 1718 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1719 do {
beb59b68
PE		 1720 rpc_set_port((struct sockaddr *)&myaddr, port);
1721 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1722 transport->xprt.addrlen);
67a391d7 1723 if (port == 0)
d3bc9a1d 1724 break;
a246b010 1725 if (err == 0) {
fbfffbd5 1726 transport->srcport = port;
d3bc9a1d 1727 break;
a246b010 1728 }
67a391d7 1729 last = port;
baaf4e48 1730 port = xs_next_srcport(transport, port);
67a391d7
TM		 1731 if (port > last)
1732 nloop++;
1733 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1734
4232e863 1735 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1736 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in *)&myaddr)->sin_addr,
1738 port, err ? "failed" : "ok", err);
1739 else
1740 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1741 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1742 port, err ? "failed" : "ok", err);
a246b010
CL		 1743 return err;
1744}
1745
176e21ee
CL		 1746/*
1747 * We don't support autobind on AF_LOCAL sockets
1748 */
1749static void xs_local_rpcbind(struct rpc_task *task)
1750{
1751 xprt_set_bound(task->tk_xprt);
1752}
1753
1754static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1755{
1756}
beb59b68 1757
ed07536e
PZ		 1758#ifdef CONFIG_DEBUG_LOCK_ALLOC
1759static struct lock_class_key xs_key[2];
1760static struct lock_class_key xs_slock_key[2];
1761
176e21ee
CL		 1762static inline void xs_reclassify_socketu(struct socket *sock)
1763{
1764 struct sock *sk = sock->sk;
1765
1766 BUG_ON(sock_owned_by_user(sk));
1767 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1768 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1769}
1770
8945ee5e 1771static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1772{
1773 struct sock *sk = sock->sk;
8945ee5e 1774
02b3d346 1775 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1776 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1777 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1778}
ed07536e 1779
8945ee5e
CL		 1780static inline void xs_reclassify_socket6(struct socket *sock)
1781{
1782 struct sock *sk = sock->sk;
ed07536e 1783
f4921aff 1784 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1785 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1786 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1787}
6bc9638a
PE		 1788
1789static inline void xs_reclassify_socket(int family, struct socket *sock)
1790{
4232e863 1791 switch (family) {
176e21ee
CL		 1792 case AF_LOCAL:
1793 xs_reclassify_socketu(sock);
1794 break;
4232e863 1795 case AF_INET:
6bc9638a 1796 xs_reclassify_socket4(sock);
4232e863
CL		 1797 break;
1798 case AF_INET6:
6bc9638a 1799 xs_reclassify_socket6(sock);
4232e863
CL		 1800 break;
1801 }
6bc9638a 1802}
ed07536e 1803#else
176e21ee
CL		 1804static inline void xs_reclassify_socketu(struct socket *sock)
1805{
1806}
1807
8945ee5e
CL		 1808static inline void xs_reclassify_socket4(struct socket *sock)
1809{
1810}
1811
1812static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1813{
1814}
6bc9638a
PE		 1815
1816static inline void xs_reclassify_socket(int family, struct socket *sock)
1817{
1818}
ed07536e
PZ		 1819#endif
1820
6bc9638a
PE		 1821static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1822 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1823{
1824 struct socket *sock;
1825 int err;
1826
6bc9638a 1827 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1828 if (err < 0) {
1829 dprintk("RPC: can't create %d transport socket (%d).\n",
1830 protocol, -err);
1831 goto out;
1832 }
6bc9638a 1833 xs_reclassify_socket(family, sock);
22f79326 1834
4cea288a
BH		 1835 err = xs_bind(transport, sock);
1836 if (err) {
22f79326
PE		 1837 sock_release(sock);
1838 goto out;
1839 }
1840
1841 return sock;
1842out:
1843 return ERR_PTR(err);
1844}
1845
176e21ee
CL		 1846static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1847 struct socket *sock)
1848{
1849 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1850 xprt);
1851
1852 if (!transport->inet) {
1853 struct sock *sk = sock->sk;
1854
1855 write_lock_bh(&sk->sk_callback_lock);
1856
1857 xs_save_old_callbacks(transport, sk);
1858
1859 sk->sk_user_data = xprt;
1860 sk->sk_data_ready = xs_local_data_ready;
1861 sk->sk_write_space = xs_udp_write_space;
1862 sk->sk_error_report = xs_error_report;
1863 sk->sk_allocation = GFP_ATOMIC;
1864
1865 xprt_clear_connected(xprt);
1866
1867 /* Reset to new socket */
1868 transport->sock = sock;
1869 transport->inet = sk;
1870
1871 write_unlock_bh(&sk->sk_callback_lock);
1872 }
1873
1874 /* Tell the socket layer to start connecting... */
1875 xprt->stat.connect_count++;
1876 xprt->stat.connect_start = jiffies;
1877 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1878}
1879
1880/**
1881 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1882 * @xprt: RPC transport to connect
1883 * @transport: socket transport to connect
1884 * @create_sock: function to create a socket of the correct type
1885 *
1886 * Invoked by a work queue tasklet.
1887 */
1888static void xs_local_setup_socket(struct work_struct *work)
1889{
1890 struct sock_xprt *transport =
1891 container_of(work, struct sock_xprt, connect_worker.work);
1892 struct rpc_xprt *xprt = &transport->xprt;
1893 struct socket *sock;
1894 int status = -EIO;
1895
5cf02d09
JL		 1896 current->flags |= PF_FSTRANS;
1897
176e21ee
CL		 1898 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1899 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1900 SOCK_STREAM, 0, &sock, 1);
1901 if (status < 0) {
1902 dprintk("RPC: can't create AF_LOCAL "
1903 "transport socket (%d).\n", -status);
1904 goto out;
1905 }
1906 xs_reclassify_socketu(sock);
1907
1908 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1910
1911 status = xs_local_finish_connecting(xprt, sock);
1912 switch (status) {
1913 case 0:
1914 dprintk("RPC: xprt %p connected to %s\n",
1915 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1916 xprt_set_connected(xprt);
1917 break;
1918 case -ENOENT:
1919 dprintk("RPC: xprt %p: socket %s does not exist\n",
1920 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1921 break;
1922 default:
1923 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1924 __func__, -status,
1925 xprt->address_strings[RPC_DISPLAY_ADDR]);
1926 }
1927
1928out:
1929 xprt_clear_connecting(xprt);
1930 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1931 current->flags &= ~PF_FSTRANS;
176e21ee
CL		 1932}
1933
a564b8f0
MG		 1934#ifdef CONFIG_SUNRPC_SWAP
1935static void xs_set_memalloc(struct rpc_xprt *xprt)
1936{
1937 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1938 xprt);
1939
1940 if (xprt->swapper)
1941 sk_set_memalloc(transport->inet);
1942}
1943
1944/**
1945 * xs_swapper - Tag this transport as being used for swap.
1946 * @xprt: transport to tag
1947 * @enable: enable/disable
1948 *
1949 */
1950int xs_swapper(struct rpc_xprt *xprt, int enable)
1951{
1952 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1953 xprt);
1954 int err = 0;
1955
1956 if (enable) {
1957 xprt->swapper++;
1958 xs_set_memalloc(xprt);
1959 } else if (xprt->swapper) {
1960 xprt->swapper--;
1961 sk_clear_memalloc(transport->inet);
1962 }
1963
1964 return err;
1965}
1966EXPORT_SYMBOL_GPL(xs_swapper);
1967#else
1968static void xs_set_memalloc(struct rpc_xprt *xprt)
1969{
1970}
1971#endif
1972
16be2d20
CL		 1973static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1974{
1975 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1976
1977 if (!transport->inet) {
1978 struct sock *sk = sock->sk;
1979
1980 write_lock_bh(&sk->sk_callback_lock);
1981
2a9e1cfa
TM		 1982 xs_save_old_callbacks(transport, sk);
1983
16be2d20 1984 sk->sk_user_data = xprt;
16be2d20
CL		 1985 sk->sk_data_ready = xs_udp_data_ready;
1986 sk->sk_write_space = xs_udp_write_space;
482f32e6 1987 sk->sk_error_report = xs_error_report;
16be2d20
CL		 1988 sk->sk_no_check = UDP_CSUM_NORCV;
1989 sk->sk_allocation = GFP_ATOMIC;
1990
1991 xprt_set_connected(xprt);
1992
1993 /* Reset to new socket */
1994 transport->sock = sock;
1995 transport->inet = sk;
1996
a564b8f0
MG		 1997 xs_set_memalloc(xprt);
1998
16be2d20
CL		 1999 write_unlock_bh(&sk->sk_callback_lock);
2000 }
2001 xs_udp_do_set_buffer_size(xprt);
2002}
2003
8c14ff2a 2004static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2005{
34161db6
TM		 2006 struct sock_xprt *transport =
2007 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2008 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2009 struct socket *sock = transport->sock;
b65c0310 2010 int status = -EIO;
9903cd1c 2011
5cf02d09
JL		 2012 current->flags |= PF_FSTRANS;
2013
b0d93ad5 2014 /* Start by resetting any existing state */
fe315e76 2015 xs_reset_transport(transport);
8c14ff2a
PE		 2016 sock = xs_create_sock(xprt, transport,
2017 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2018 if (IS_ERR(sock))
b0d93ad5 2019 goto out;
68e220bd 2020
c740eff8
CL		 2021 dprintk("RPC: worker connecting xprt %p via %s to "
2022 "%s (port %s)\n", xprt,
2023 xprt->address_strings[RPC_DISPLAY_PROTO],
2024 xprt->address_strings[RPC_DISPLAY_ADDR],
2025 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2026
2027 xs_udp_finish_connecting(xprt, sock);
b0d93ad5
CL		 2028 status = 0;
2029out:
b0d93ad5 2030 xprt_clear_connecting(xprt);
7d1e8255 2031 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2032 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2033}
2034
3167e12c
CL		 2035/*
2036 * We need to preserve the port number so the reply cache on the server can
2037 * find our cached RPC replies when we get around to reconnecting.
2038 */
58dddac9 2039static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2040{
2041 int result;
3167e12c
CL		 2042 struct sockaddr any;
2043
58dddac9 2044 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2045
2046 /*
2047 * Disconnect the transport socket by doing a connect operation
2048 * with AF_UNSPEC. This should return immediately...
2049 */
2050 memset(&any, 0, sizeof(any));
2051 any.sa_family = AF_UNSPEC;
ee0ac0c2 2052 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
7d1e8255 2053 if (!result)
58dddac9 2054 xs_sock_mark_closed(&transport->xprt);
7d1e8255 2055 else
46121cf7 2056 dprintk("RPC: AF_UNSPEC connect return code %d\n",
3167e12c
CL		 2057 result);
2058}
2059
58dddac9 2060static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2061{
2062 unsigned int state = transport->inet->sk_state;
2063
669502ff
AC		 2064 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2065 /* we don't need to abort the connection if the socket
2066 * hasn't undergone a shutdown
2067 */
2068 if (transport->inet->sk_shutdown == 0)
2069 return;
2070 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2071 __func__, transport->inet->sk_shutdown);
2072 }
2073 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2074 /* we don't need to abort the connection if the socket
2075 * hasn't undergone a shutdown
2076 */
2077 if (transport->inet->sk_shutdown == 0)
2078 return;
2079 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2080 "sk_shutdown set to %d\n",
2081 __func__, transport->inet->sk_shutdown);
2082 }
58dddac9 2083 xs_abort_connection(transport);
40d2549d
TM		 2084}
2085
16be2d20 2086static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2087{
16be2d20 2088 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2089 int ret = -ENOTCONN;
edb267a6 2090
ee0ac0c2 2091 if (!transport->inet) {
b0d93ad5
CL		 2092 struct sock *sk = sock->sk;
2093
2094 write_lock_bh(&sk->sk_callback_lock);
2095
2a9e1cfa
TM		 2096 xs_save_old_callbacks(transport, sk);
2097
b0d93ad5 2098 sk->sk_user_data = xprt;
b0d93ad5
CL		 2099 sk->sk_data_ready = xs_tcp_data_ready;
2100 sk->sk_state_change = xs_tcp_state_change;
2101 sk->sk_write_space = xs_tcp_write_space;
482f32e6 2102 sk->sk_error_report = xs_error_report;
b079fa7b 2103 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2104
2105 /* socket options */
2106 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2107 sock_reset_flag(sk, SOCK_LINGER);
2108 tcp_sk(sk)->linger2 = 0;
2109 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2110
2111 xprt_clear_connected(xprt);
2112
2113 /* Reset to new socket */
ee0ac0c2
CL		 2114 transport->sock = sock;
2115 transport->inet = sk;
b0d93ad5
CL		 2116
2117 write_unlock_bh(&sk->sk_callback_lock);
2118 }
2119
01d37c42 2120 if (!xprt_bound(xprt))
fe19a96b 2121 goto out;
01d37c42 2122
a564b8f0
MG		 2123 xs_set_memalloc(xprt);
2124
b0d93ad5 2125 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2126 xprt->stat.connect_count++;
2127 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2128 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2129 switch (ret) {
2130 case 0:
2131 case -EINPROGRESS:
2132 /* SYN_SENT! */
2133 xprt->connect_cookie++;
2134 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2135 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2136 }
2137out:
2138 return ret;
16be2d20
CL		 2139}
2140
9903cd1c 2141/**
b61d59ff
TM		 2142 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2143 * @xprt: RPC transport to connect
2144 * @transport: socket transport to connect
2145 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2146 *
2147 * Invoked by a work queue tasklet.
a246b010 2148 */
cdd518d5 2149static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2150{
cdd518d5
PE		 2151 struct sock_xprt *transport =
2152 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2153 struct socket *sock = transport->sock;
a9f5f0f7 2154 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2155 int status = -EIO;
a246b010 2156
5cf02d09
JL		 2157 current->flags |= PF_FSTRANS;
2158
ee0ac0c2 2159 if (!sock) {
7d1e8255 2160 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2161 sock = xs_create_sock(xprt, transport,
2162 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2163 if (IS_ERR(sock)) {
2164 status = PTR_ERR(sock);
3167e12c
CL		 2165 goto out;
2166 }
7d1e8255
TM		 2167 } else {
2168 int abort_and_exit;
a246b010 2169
7d1e8255
TM		 2170 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2171 &xprt->state);
3167e12c 2172 /* "close" the socket, preserving the local port */
58dddac9 2173 xs_tcp_reuse_connection(transport);
a246b010 2174
7d1e8255
TM		 2175 if (abort_and_exit)
2176 goto out_eagain;
2177 }
a246b010 2178
c740eff8
CL		 2179 dprintk("RPC: worker connecting xprt %p via %s to "
2180 "%s (port %s)\n", xprt,
2181 xprt->address_strings[RPC_DISPLAY_PROTO],
2182 xprt->address_strings[RPC_DISPLAY_ADDR],
2183 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2184
16be2d20 2185 status = xs_tcp_finish_connecting(xprt, sock);
46121cf7
CL		 2186 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2187 xprt, -status, xprt_connected(xprt),
2188 sock->sk->sk_state);
2a491991 2189 switch (status) {
f75e6745
TM		 2190 default:
2191 printk("%s: connect returned unhandled error %d\n",
2192 __func__, status);
2193 case -EADDRNOTAVAIL:
2194 /* We're probably in TIME_WAIT. Get rid of existing socket,
2195 * and retry
2196 */
a519fc7a 2197 xs_tcp_force_close(xprt);
88b5ed73 2198 break;
8a2cec29
TM		 2199 case -ECONNREFUSED:
2200 case -ECONNRESET:
2201 case -ENETUNREACH:
2202 /* retry with existing socket, after a delay */
2a491991
TM		 2203 case 0:
2204 case -EINPROGRESS:
2205 case -EALREADY:
7d1e8255 2206 xprt_clear_connecting(xprt);
5cf02d09 2207 current->flags &= ~PF_FSTRANS;
7d1e8255 2208 return;
9fcfe0c8
TM		 2209 case -EINVAL:
2210 /* Happens, for instance, if the user specified a link
2211 * local IPv6 address without a scope-id.
2212 */
2213 goto out;
a246b010 2214 }
7d1e8255 2215out_eagain:
2a491991 2216 status = -EAGAIN;
a246b010 2217out:
68e220bd 2218 xprt_clear_connecting(xprt);
7d1e8255 2219 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2220 current->flags &= ~PF_FSTRANS;
68e220bd 2221}
b0d93ad5 2222
9903cd1c
CL		 2223/**
2224 * xs_connect - connect a socket to a remote endpoint
2225 * @task: address of RPC task that manages state of connect request
2226 *
2227 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2228 *
2229 * UDP socket connects are synchronous, but we use a work queue anyway
2230 * to guarantee that even unprivileged user processes can set up a
2231 * socket on a privileged port.
2232 *
2233 * If a UDP socket connect fails, the delay behavior here prevents
2234 * retry floods (hard mounts).
9903cd1c
CL		 2235 */
2236static void xs_connect(struct rpc_task *task)
a246b010
CL		 2237{
2238 struct rpc_xprt *xprt = task->tk_xprt;
ee0ac0c2 2239 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2240
09a21c41 2241 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2242 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2243 "seconds\n",
03bf4b70 2244 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2245 queue_delayed_work(rpciod_workqueue,
2246 &transport->connect_worker,
2247 xprt->reestablish_timeout);
03bf4b70 2248 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2249 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2250 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2251 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2252 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2253 } else {
46121cf7 2254 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2255 queue_delayed_work(rpciod_workqueue,
2256 &transport->connect_worker, 0);
a246b010
CL		 2257 }
2258}
2259
176e21ee
CL		 2260/**
2261 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2262 * @xprt: rpc_xprt struct containing statistics
2263 * @seq: output file
2264 *
2265 */
2266static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2267{
2268 long idle_time = 0;
2269
2270 if (xprt_connected(xprt))
2271 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2272
2273 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2274 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2275 xprt->stat.bind_count,
2276 xprt->stat.connect_count,
2277 xprt->stat.connect_time,
2278 idle_time,
2279 xprt->stat.sends,
2280 xprt->stat.recvs,
2281 xprt->stat.bad_xids,
2282 xprt->stat.req_u,
15a45206
AA		 2283 xprt->stat.bklog_u,
2284 xprt->stat.max_slots,
2285 xprt->stat.sending_u,
2286 xprt->stat.pending_u);
176e21ee
CL		 2287}
2288
262ca07d
CL		 2289/**
2290 * xs_udp_print_stats - display UDP socket-specifc stats
2291 * @xprt: rpc_xprt struct containing statistics
2292 * @seq: output file
2293 *
2294 */
2295static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2296{
c8475461
CL		 2297 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2298
15a45206
AA		 2299 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2300 "%lu %llu %llu\n",
fbfffbd5 2301 transport->srcport,
262ca07d
CL		 2302 xprt->stat.bind_count,
2303 xprt->stat.sends,
2304 xprt->stat.recvs,
2305 xprt->stat.bad_xids,
2306 xprt->stat.req_u,
15a45206
AA		 2307 xprt->stat.bklog_u,
2308 xprt->stat.max_slots,
2309 xprt->stat.sending_u,
2310 xprt->stat.pending_u);
262ca07d
CL		 2311}
2312
2313/**
2314 * xs_tcp_print_stats - display TCP socket-specifc stats
2315 * @xprt: rpc_xprt struct containing statistics
2316 * @seq: output file
2317 *
2318 */
2319static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2320{
c8475461 2321 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2322 long idle_time = 0;
2323
2324 if (xprt_connected(xprt))
2325 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2326
15a45206
AA		 2327 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2328 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2329 transport->srcport,
262ca07d
CL		 2330 xprt->stat.bind_count,
2331 xprt->stat.connect_count,
2332 xprt->stat.connect_time,
2333 idle_time,
2334 xprt->stat.sends,
2335 xprt->stat.recvs,
2336 xprt->stat.bad_xids,
2337 xprt->stat.req_u,
15a45206
AA		 2338 xprt->stat.bklog_u,
2339 xprt->stat.max_slots,
2340 xprt->stat.sending_u,
2341 xprt->stat.pending_u);
262ca07d
CL		 2342}
2343
4cfc7e60
RI		 2344/*
2345 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2346 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2347 * to use the server side send routines.
2348 */
5a51f13a 2349static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2350{
2351 struct page *page;
2352 struct rpc_buffer *buf;
2353
2354 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2355 page = alloc_page(GFP_KERNEL);
2356
2357 if (!page)
2358 return NULL;
2359
2360 buf = page_address(page);
2361 buf->len = PAGE_SIZE;
2362
2363 return buf->data;
2364}
2365
2366/*
2367 * Free the space allocated in the bc_alloc routine
2368 */
5a51f13a 2369static void bc_free(void *buffer)
4cfc7e60
RI		 2370{
2371 struct rpc_buffer *buf;
2372
2373 if (!buffer)
2374 return;
2375
2376 buf = container_of(buffer, struct rpc_buffer, data);
2377 free_page((unsigned long)buf);
2378}
2379
2380/*
2381 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2382 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2383 */
2384static int bc_sendto(struct rpc_rqst *req)
2385{
2386 int len;
2387 struct xdr_buf *xbufp = &req->rq_snd_buf;
2388 struct rpc_xprt *xprt = req->rq_xprt;
2389 struct sock_xprt *transport =
2390 container_of(xprt, struct sock_xprt, xprt);
2391 struct socket *sock = transport->sock;
2392 unsigned long headoff;
2393 unsigned long tailoff;
2394
61677eee 2395 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2396
2397 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2398 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2399 len = svc_send_common(sock, xbufp,
2400 virt_to_page(xbufp->head[0].iov_base), headoff,
2401 xbufp->tail[0].iov_base, tailoff);
2402
2403 if (len != xbufp->len) {
2404 printk(KERN_NOTICE "Error sending entire callback!\n");
2405 len = -EAGAIN;
2406 }
2407
2408 return len;
2409}
2410
2411/*
2412 * The send routine. Borrows from svc_send
2413 */
2414static int bc_send_request(struct rpc_task *task)
2415{
2416 struct rpc_rqst *req = task->tk_rqstp;
2417 struct svc_xprt *xprt;
2418 struct svc_sock *svsk;
2419 u32 len;
2420
2421 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2422 /*
2423 * Get the server socket associated with this callback xprt
2424 */
2425 xprt = req->rq_xprt->bc_xprt;
2426 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2427
2428 /*
2429 * Grab the mutex to serialize data as the connection is shared
2430 * with the fore channel
2431 */
2432 if (!mutex_trylock(&xprt->xpt_mutex)) {
2433 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2434 if (!mutex_trylock(&xprt->xpt_mutex))
2435 return -EAGAIN;
2436 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2437 }
2438 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2439 len = -ENOTCONN;
2440 else
2441 len = bc_sendto(req);
2442 mutex_unlock(&xprt->xpt_mutex);
2443
2444 if (len > 0)
2445 len = 0;
2446
2447 return len;
2448}
2449
2450/*
2451 * The close routine. Since this is client initiated, we do nothing
2452 */
2453
2454static void bc_close(struct rpc_xprt *xprt)
2455{
4cfc7e60
RI		 2456}
2457
2458/*
2459 * The xprt destroy routine. Again, because this connection is client
2460 * initiated, we do nothing
2461 */
2462
2463static void bc_destroy(struct rpc_xprt *xprt)
2464{
4cfc7e60
RI		 2465}
2466
176e21ee
CL		 2467static struct rpc_xprt_ops xs_local_ops = {
2468 .reserve_xprt = xprt_reserve_xprt,
2469 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2470 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2471 .rpcbind = xs_local_rpcbind,
2472 .set_port = xs_local_set_port,
2473 .connect = xs_connect,
2474 .buf_alloc = rpc_malloc,
2475 .buf_free = rpc_free,
2476 .send_request = xs_local_send_request,
2477 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2478 .close = xs_close,
2479 .destroy = xs_destroy,
2480 .print_stats = xs_local_print_stats,
2481};
2482
262965f5 2483static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2484 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2485 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2486 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2487 .alloc_slot = xprt_alloc_slot,
45160d62 2488 .rpcbind = rpcb_getport_async,
92200412 2489 .set_port = xs_set_port,
262965f5 2490 .connect = xs_connect,
02107148
CL		 2491 .buf_alloc = rpc_malloc,
2492 .buf_free = rpc_free,
262965f5 2493 .send_request = xs_udp_send_request,
fe3aca29 2494 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2495 .timer = xs_udp_timer,
a58dd398 2496 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2497 .close = xs_close,
2498 .destroy = xs_destroy,
262ca07d 2499 .print_stats = xs_udp_print_stats,
262965f5
CL		 2500};
2501
2502static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2503 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2504 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2505 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2506 .rpcbind = rpcb_getport_async,
92200412 2507 .set_port = xs_set_port,
0b9e7943 2508 .connect = xs_connect,
02107148
CL		 2509 .buf_alloc = rpc_malloc,
2510 .buf_free = rpc_free,
262965f5 2511 .send_request = xs_tcp_send_request,
fe3aca29 2512 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2513 .close = xs_tcp_close,
9903cd1c 2514 .destroy = xs_destroy,
262ca07d 2515 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2516};
2517
4cfc7e60
RI		 2518/*
2519 * The rpc_xprt_ops for the server backchannel
2520 */
2521
2522static struct rpc_xprt_ops bc_tcp_ops = {
2523 .reserve_xprt = xprt_reserve_xprt,
2524 .release_xprt = xprt_release_xprt,
84e28a30 2525 .alloc_slot = xprt_alloc_slot,
92769108 2526 .rpcbind = xs_local_rpcbind,
4cfc7e60
RI		 2527 .buf_alloc = bc_malloc,
2528 .buf_free = bc_free,
2529 .send_request = bc_send_request,
2530 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2531 .close = bc_close,
2532 .destroy = bc_destroy,
2533 .print_stats = xs_tcp_print_stats,
2534};
2535
92476850
CL		 2536static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2537{
2538 static const struct sockaddr_in sin = {
2539 .sin_family = AF_INET,
2540 .sin_addr.s_addr = htonl(INADDR_ANY),
2541 };
2542 static const struct sockaddr_in6 sin6 = {
2543 .sin6_family = AF_INET6,
2544 .sin6_addr = IN6ADDR_ANY_INIT,
2545 };
2546
2547 switch (family) {
176e21ee
CL		 2548 case AF_LOCAL:
2549 break;
92476850
CL		 2550 case AF_INET:
2551 memcpy(sap, &sin, sizeof(sin));
2552 break;
2553 case AF_INET6:
2554 memcpy(sap, &sin6, sizeof(sin6));
2555 break;
2556 default:
2557 dprintk("RPC: %s: Bad address family\n", __func__);
2558 return -EAFNOSUPPORT;
2559 }
2560 return 0;
2561}
2562
3c341b0b 2563static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2564 unsigned int slot_table_size,
2565 unsigned int max_slot_table_size)
c8541ecd
CL		 2566{
2567 struct rpc_xprt *xprt;
ffc2e518 2568 struct sock_xprt *new;
c8541ecd 2569
96802a09 2570 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2571 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2572 return ERR_PTR(-EBADF);
2573 }
2574
d9ba131d
TM		 2575 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2576 max_slot_table_size);
bd1722d4 2577 if (xprt == NULL) {
46121cf7
CL		 2578 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2579 "rpc_xprt\n");
c8541ecd
CL		 2580 return ERR_PTR(-ENOMEM);
2581 }
c8541ecd 2582
bd1722d4 2583 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2584 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2585 xprt->addrlen = args->addrlen;
d3bc9a1d 2586 if (args->srcaddr)
fbfffbd5 2587 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2588 else {
2589 int err;
2590 err = xs_init_anyaddr(args->dstaddr->sa_family,
2591 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2592 if (err != 0) {
2593 xprt_free(xprt);
92476850 2594 return ERR_PTR(err);
2aa13531 2595 }
92476850 2596 }
c8541ecd
CL		 2597
2598 return xprt;
2599}
2600
176e21ee
CL		 2601static const struct rpc_timeout xs_local_default_timeout = {
2602 .to_initval = 10 * HZ,
2603 .to_maxval = 10 * HZ,
2604 .to_retries = 2,
2605};
2606
2607/**
2608 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2609 * @args: rpc transport creation arguments
2610 *
2611 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2612 */
2613static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2614{
2615 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2616 struct sock_xprt *transport;
2617 struct rpc_xprt *xprt;
2618 struct rpc_xprt *ret;
2619
d9ba131d
TM		 2620 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2621 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2622 if (IS_ERR(xprt))
2623 return xprt;
2624 transport = container_of(xprt, struct sock_xprt, xprt);
2625
2626 xprt->prot = 0;
2627 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2628 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2629
2630 xprt->bind_timeout = XS_BIND_TO;
2631 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2632 xprt->idle_timeout = XS_IDLE_DISC_TO;
2633
2634 xprt->ops = &xs_local_ops;
2635 xprt->timeout = &xs_local_default_timeout;
2636
2637 switch (sun->sun_family) {
2638 case AF_LOCAL:
2639 if (sun->sun_path[0] != '/') {
2640 dprintk("RPC: bad AF_LOCAL address: %s\n",
2641 sun->sun_path);
2642 ret = ERR_PTR(-EINVAL);
2643 goto out_err;
2644 }
2645 xprt_set_bound(xprt);
2646 INIT_DELAYED_WORK(&transport->connect_worker,
2647 xs_local_setup_socket);
2648 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2649 break;
2650 default:
2651 ret = ERR_PTR(-EAFNOSUPPORT);
2652 goto out_err;
2653 }
2654
2655 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2656 xprt->address_strings[RPC_DISPLAY_ADDR]);
2657
2658 if (try_module_get(THIS_MODULE))
2659 return xprt;
2660 ret = ERR_PTR(-EINVAL);
2661out_err:
2662 xprt_free(xprt);
2663 return ret;
2664}
2665
2881ae74
TM		 2666static const struct rpc_timeout xs_udp_default_timeout = {
2667 .to_initval = 5 * HZ,
2668 .to_maxval = 30 * HZ,
2669 .to_increment = 5 * HZ,
2670 .to_retries = 5,
2671};
2672
9903cd1c
CL		 2673/**
2674 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2675 * @args: rpc transport creation arguments
9903cd1c
CL		 2676 *
2677 */
483066d6 2678static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2679{
8f9d5b1a 2680 struct sockaddr *addr = args->dstaddr;
c8541ecd 2681 struct rpc_xprt *xprt;
c8475461 2682 struct sock_xprt *transport;
0a68b0be 2683 struct rpc_xprt *ret;
a246b010 2684
d9ba131d
TM		 2685 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2686 xprt_udp_slot_table_entries);
c8541ecd
CL		 2687 if (IS_ERR(xprt))
2688 return xprt;
c8475461 2689 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2690
ec739ef0 2691 xprt->prot = IPPROTO_UDP;
808012fb 2692 xprt->tsh_size = 0;
a246b010
CL		 2693 /* XXX: header size can vary due to auth type, IPv6, etc. */
2694 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2695
03bf4b70 2696 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2697 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2698 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2699
262965f5 2700 xprt->ops = &xs_udp_ops;
a246b010 2701
ba7392bb 2702 xprt->timeout = &xs_udp_default_timeout;
a246b010 2703
8f9d5b1a
CL		 2704 switch (addr->sa_family) {
2705 case AF_INET:
2706 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2707 xprt_set_bound(xprt);
2708
2709 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2710 xs_udp_setup_socket);
9dc3b095 2711 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2712 break;
2713 case AF_INET6:
2714 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2715 xprt_set_bound(xprt);
2716
2717 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2718 xs_udp_setup_socket);
9dc3b095 2719 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2720 break;
2721 default:
0a68b0be
BF		 2722 ret = ERR_PTR(-EAFNOSUPPORT);
2723 goto out_err;
8f9d5b1a
CL		 2724 }
2725
c740eff8
CL		 2726 if (xprt_bound(xprt))
2727 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2728 xprt->address_strings[RPC_DISPLAY_ADDR],
2729 xprt->address_strings[RPC_DISPLAY_PORT],
2730 xprt->address_strings[RPC_DISPLAY_PROTO]);
2731 else
2732 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2733 xprt->address_strings[RPC_DISPLAY_ADDR],
2734 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2735
bc25571e
TT		 2736 if (try_module_get(THIS_MODULE))
2737 return xprt;
0a68b0be
BF		 2738 ret = ERR_PTR(-EINVAL);
2739out_err:
e204e621 2740 xprt_free(xprt);
0a68b0be 2741 return ret;
a246b010
CL		 2742}
2743
2881ae74
TM		 2744static const struct rpc_timeout xs_tcp_default_timeout = {
2745 .to_initval = 60 * HZ,
2746 .to_maxval = 60 * HZ,
2747 .to_retries = 2,
2748};
2749
9903cd1c
CL		 2750/**
2751 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2752 * @args: rpc transport creation arguments
9903cd1c
CL		 2753 *
2754 */
483066d6 2755static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2756{
8f9d5b1a 2757 struct sockaddr *addr = args->dstaddr;
c8541ecd 2758 struct rpc_xprt *xprt;
c8475461 2759 struct sock_xprt *transport;
0a68b0be 2760 struct rpc_xprt *ret;
a246b010 2761
d9ba131d
TM		 2762 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2763 xprt_max_tcp_slot_table_entries);
c8541ecd
CL		 2764 if (IS_ERR(xprt))
2765 return xprt;
c8475461 2766 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2767
ec739ef0 2768 xprt->prot = IPPROTO_TCP;
808012fb 2769 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2770 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2771
03bf4b70 2772 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2773 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2774 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2775
262965f5 2776 xprt->ops = &xs_tcp_ops;
ba7392bb 2777 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2778
8f9d5b1a
CL		 2779 switch (addr->sa_family) {
2780 case AF_INET:
2781 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2782 xprt_set_bound(xprt);
2783
9dc3b095 2784 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2785 xs_tcp_setup_socket);
9dc3b095 2786 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2787 break;
2788 case AF_INET6:
2789 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2790 xprt_set_bound(xprt);
2791
9dc3b095 2792 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2793 xs_tcp_setup_socket);
9dc3b095 2794 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2795 break;
2796 default:
0a68b0be
BF		 2797 ret = ERR_PTR(-EAFNOSUPPORT);
2798 goto out_err;
8f9d5b1a
CL		 2799 }
2800
c740eff8
CL		 2801 if (xprt_bound(xprt))
2802 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2803 xprt->address_strings[RPC_DISPLAY_ADDR],
2804 xprt->address_strings[RPC_DISPLAY_PORT],
2805 xprt->address_strings[RPC_DISPLAY_PROTO]);
2806 else
2807 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2808 xprt->address_strings[RPC_DISPLAY_ADDR],
2809 xprt->address_strings[RPC_DISPLAY_PROTO]);
2810
edb267a6 2811
bc25571e
TT		 2812 if (try_module_get(THIS_MODULE))
2813 return xprt;
0a68b0be
BF		 2814 ret = ERR_PTR(-EINVAL);
2815out_err:
e204e621 2816 xprt_free(xprt);
0a68b0be 2817 return ret;
a246b010 2818}
282b32e1 2819
f300baba
AB		 2820/**
2821 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2822 * @args: rpc transport creation arguments
2823 *
2824 */
2825static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2826{
2827 struct sockaddr *addr = args->dstaddr;
2828 struct rpc_xprt *xprt;
2829 struct sock_xprt *transport;
2830 struct svc_sock *bc_sock;
0a68b0be 2831 struct rpc_xprt *ret;
f300baba 2832
f0418aa4
BF		 2833 if (args->bc_xprt->xpt_bc_xprt) {
2834 /*
2835 * This server connection already has a backchannel
2836 * export; we can't create a new one, as we wouldn't be
2837 * able to match replies based on xid any more. So,
2838 * reuse the already-existing one:
2839 */
2840 return args->bc_xprt->xpt_bc_xprt;
2841 }
d9ba131d
TM		 2842 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2843 xprt_tcp_slot_table_entries);
f300baba
AB		 2844 if (IS_ERR(xprt))
2845 return xprt;
2846 transport = container_of(xprt, struct sock_xprt, xprt);
2847
2848 xprt->prot = IPPROTO_TCP;
2849 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2850 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2851 xprt->timeout = &xs_tcp_default_timeout;
2852
2853 /* backchannel */
2854 xprt_set_bound(xprt);
2855 xprt->bind_timeout = 0;
f300baba
AB		 2856 xprt->reestablish_timeout = 0;
2857 xprt->idle_timeout = 0;
2858
f300baba
AB		 2859 xprt->ops = &bc_tcp_ops;
2860
2861 switch (addr->sa_family) {
2862 case AF_INET:
2863 xs_format_peer_addresses(xprt, "tcp",
2864 RPCBIND_NETID_TCP);
2865 break;
2866 case AF_INET6:
2867 xs_format_peer_addresses(xprt, "tcp",
2868 RPCBIND_NETID_TCP6);
2869 break;
2870 default:
0a68b0be
BF		 2871 ret = ERR_PTR(-EAFNOSUPPORT);
2872 goto out_err;
f300baba
AB		 2873 }
2874
50fa0d40
PE		 2875 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2876 xprt->address_strings[RPC_DISPLAY_ADDR],
2877 xprt->address_strings[RPC_DISPLAY_PORT],
2878 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2879
99de8ea9
BF		 2880 /*
2881 * Once we've associated a backchannel xprt with a connection,
2882 * we want to keep it around as long as long as the connection
2883 * lasts, in case we need to start using it for a backchannel
2884 * again; this reference won't be dropped until bc_xprt is
2885 * destroyed.
2886 */
2887 xprt_get(xprt);
2888 args->bc_xprt->xpt_bc_xprt = xprt;
2889 xprt->bc_xprt = args->bc_xprt;
2890 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2891 transport->sock = bc_sock->sk_sock;
2892 transport->inet = bc_sock->sk_sk;
2893
f300baba
AB		 2894 /*
2895 * Since we don't want connections for the backchannel, we set
2896 * the xprt status to connected
2897 */
2898 xprt_set_connected(xprt);
2899
2900
2901 if (try_module_get(THIS_MODULE))
2902 return xprt;
99de8ea9 2903 xprt_put(xprt);
0a68b0be
BF		 2904 ret = ERR_PTR(-EINVAL);
2905out_err:
e204e621 2906 xprt_free(xprt);
0a68b0be 2907 return ret;
f300baba
AB		 2908}
2909
176e21ee
CL		 2910static struct xprt_class xs_local_transport = {
2911 .list = LIST_HEAD_INIT(xs_local_transport.list),
2912 .name = "named UNIX socket",
2913 .owner = THIS_MODULE,
2914 .ident = XPRT_TRANSPORT_LOCAL,
2915 .setup = xs_setup_local,
2916};
2917
bc25571e
TT		 2918static struct xprt_class xs_udp_transport = {
2919 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2920 .name = "udp",
2921 .owner = THIS_MODULE,
f300baba 2922 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2923 .setup = xs_setup_udp,
2924};
2925
2926static struct xprt_class xs_tcp_transport = {
2927 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2928 .name = "tcp",
2929 .owner = THIS_MODULE,
f300baba 2930 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2931 .setup = xs_setup_tcp,
2932};
2933
f300baba
AB		 2934static struct xprt_class xs_bc_tcp_transport = {
2935 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2936 .name = "tcp NFSv4.1 backchannel",
2937 .owner = THIS_MODULE,
2938 .ident = XPRT_TRANSPORT_BC_TCP,
2939 .setup = xs_setup_bc_tcp,
2940};
2941
282b32e1 2942/**
bc25571e 2943 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2944 *
2945 */
2946int init_socket_xprt(void)
2947{
fbf76683 2948#ifdef RPC_DEBUG
2b1bec5f 2949 if (!sunrpc_table_header)
0b4d4147 2950 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2951#endif
2952
176e21ee 2953 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2954 xprt_register_transport(&xs_udp_transport);
2955 xprt_register_transport(&xs_tcp_transport);
f300baba 2956 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2957
282b32e1
CL		 2958 return 0;
2959}
2960
2961/**
bc25571e 2962 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2963 *
2964 */
2965void cleanup_socket_xprt(void)
2966{
fbf76683
CL		 2967#ifdef RPC_DEBUG
2968 if (sunrpc_table_header) {
2969 unregister_sysctl_table(sunrpc_table_header);
2970 sunrpc_table_header = NULL;
2971 }
2972#endif
bc25571e 2973
176e21ee 2974 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2975 xprt_unregister_transport(&xs_udp_transport);
2976 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2977 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2978}
cbf11071 2979
9bbb9e5a
RR		 2980static int param_set_uint_minmax(const char *val,
2981 const struct kernel_param *kp,
cbf11071
TM		 2982 unsigned int min, unsigned int max)
2983{
2984 unsigned long num;
2985 int ret;
2986
2987 if (!val)
2988 return -EINVAL;
2989 ret = strict_strtoul(val, 0, &num);
2990 if (ret == -EINVAL || num < min || num > max)
2991 return -EINVAL;
2992 *((unsigned int *)kp->arg) = num;
2993 return 0;
2994}
2995
9bbb9e5a 2996static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 2997{
2998 return param_set_uint_minmax(val, kp,
2999 RPC_MIN_RESVPORT,
3000 RPC_MAX_RESVPORT);
3001}
3002
9bbb9e5a
RR		 3003static struct kernel_param_ops param_ops_portnr = {
3004 .set = param_set_portnr,
3005 .get = param_get_uint,
3006};
3007
cbf11071
TM		 3008#define param_check_portnr(name, p) \
3009 __param_check(name, p, unsigned int);
3010
3011module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3012module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3013
9bbb9e5a
RR		 3014static int param_set_slot_table_size(const char *val,
3015 const struct kernel_param *kp)
cbf11071
TM		 3016{
3017 return param_set_uint_minmax(val, kp,
3018 RPC_MIN_SLOT_TABLE,
3019 RPC_MAX_SLOT_TABLE);
3020}
3021
9bbb9e5a
RR		 3022static struct kernel_param_ops param_ops_slot_table_size = {
3023 .set = param_set_slot_table_size,
3024 .get = param_get_uint,
3025};
3026
cbf11071
TM		 3027#define param_check_slot_table_size(name, p) \
3028 __param_check(name, p, unsigned int);
3029
d9ba131d
TM		 3030static int param_set_max_slot_table_size(const char *val,
3031 const struct kernel_param *kp)
3032{
3033 return param_set_uint_minmax(val, kp,
3034 RPC_MIN_SLOT_TABLE,
3035 RPC_MAX_SLOT_TABLE_LIMIT);
3036}
3037
3038static struct kernel_param_ops param_ops_max_slot_table_size = {
3039 .set = param_set_max_slot_table_size,
3040 .get = param_get_uint,
3041};
3042
3043#define param_check_max_slot_table_size(name, p) \
3044 __param_check(name, p, unsigned int);
3045
cbf11071
TM		 3046module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3047 slot_table_size, 0644);
d9ba131d
TM		 3048module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3049 max_slot_table_size, 0644);
cbf11071
TM		 3050module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3051 slot_table_size, 0644);
3052