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Merge tag 'stable/for-linus-3.7-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
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:
55420c24 740 case -EPIPE:
2a9e1cfa
TM		 741 xs_tcp_shutdown(xprt);
742 case -ECONNREFUSED:
262965f5 743 case -ENOTCONN:
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++;
a519fc7a 1519 xs_tcp_force_close(xprt);
663b8858
TM		 1520 case TCP_CLOSING:
1521 /*
1522 * If the server closed down the connection, make sure that
1523 * we back off before reconnecting
1524 */
1525 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1526 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1527 break;
1528 case TCP_LAST_ACK:
670f9457 1529 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1530 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1531 smp_mb__before_clear_bit();
1532 clear_bit(XPRT_CONNECTED, &xprt->state);
1533 smp_mb__after_clear_bit();
1534 break;
1535 case TCP_CLOSE:
7d1e8255
TM		 1536 xs_tcp_cancel_linger_timeout(xprt);
1537 xs_sock_mark_closed(xprt);
a246b010
CL		 1538 }
1539 out:
f064af1e 1540 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1541}
1542
2a9e1cfa 1543/**
482f32e6 1544 * xs_error_report - callback mainly for catching socket errors
2a9e1cfa
TM		 1545 * @sk: socket
1546 */
482f32e6 1547static void xs_error_report(struct sock *sk)
2a9e1cfa
TM		 1548{
1549 struct rpc_xprt *xprt;
1550
f064af1e 1551 read_lock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1552 if (!(xprt = xprt_from_sock(sk)))
1553 goto out;
1554 dprintk("RPC: %s client %p...\n"
1555 "RPC: error %d\n",
1556 __func__, xprt, sk->sk_err);
482f32e6 1557 xprt_wake_pending_tasks(xprt, -EAGAIN);
2a9e1cfa 1558out:
f064af1e 1559 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1560}
1561
1f0fa154
IJ		 1562static void xs_write_space(struct sock *sk)
1563{
1564 struct socket *sock;
1565 struct rpc_xprt *xprt;
1566
1567 if (unlikely(!(sock = sk->sk_socket)))
1568 return;
1569 clear_bit(SOCK_NOSPACE, &sock->flags);
1570
1571 if (unlikely(!(xprt = xprt_from_sock(sk))))
1572 return;
1573 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1574 return;
1575
1576 xprt_write_space(xprt);
1577}
1578
9903cd1c 1579/**
c7b2cae8
CL		 1580 * xs_udp_write_space - callback invoked when socket buffer space
1581 * becomes available
9903cd1c
CL		 1582 * @sk: socket whose state has changed
1583 *
a246b010
CL		 1584 * Called when more output buffer space is available for this socket.
1585 * We try not to wake our writers until they can make "significant"
c7b2cae8 1586 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1587 * with a bunch of small requests.
1588 */
c7b2cae8 1589static void xs_udp_write_space(struct sock *sk)
a246b010 1590{
f064af1e 1591 read_lock_bh(&sk->sk_callback_lock);
a246b010 1592
c7b2cae8 1593 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1594 if (sock_writeable(sk))
1595 xs_write_space(sk);
a246b010 1596
f064af1e 1597 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1598}
a246b010 1599
c7b2cae8
CL		 1600/**
1601 * xs_tcp_write_space - callback invoked when socket buffer space
1602 * becomes available
1603 * @sk: socket whose state has changed
1604 *
1605 * Called when more output buffer space is available for this socket.
1606 * We try not to wake our writers until they can make "significant"
1607 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1608 * with a bunch of small requests.
1609 */
1610static void xs_tcp_write_space(struct sock *sk)
1611{
f064af1e 1612 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1613
1614 /* from net/core/stream.c:sk_stream_write_space */
1f0fa154
IJ		 1615 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1616 xs_write_space(sk);
b6ddf64f 1617
f064af1e 1618 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1619}
1620
470056c2 1621static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1622{
ee0ac0c2
CL		 1623 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1624 struct sock *sk = transport->inet;
a246b010 1625
7c6e066e 1626 if (transport->rcvsize) {
a246b010 1627 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1628 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1629 }
7c6e066e 1630 if (transport->sndsize) {
a246b010 1631 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1632 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1633 sk->sk_write_space(sk);
1634 }
1635}
1636
43118c29 1637/**
470056c2 1638 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1639 * @xprt: generic transport
470056c2
CL		 1640 * @sndsize: requested size of send buffer, in bytes
1641 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1642 *
470056c2 1643 * Set socket send and receive buffer size limits.
43118c29 1644 */
470056c2 1645static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1646{
7c6e066e
CL		 1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1648
1649 transport->sndsize = 0;
470056c2 1650 if (sndsize)
7c6e066e
CL		 1651 transport->sndsize = sndsize + 1024;
1652 transport->rcvsize = 0;
470056c2 1653 if (rcvsize)
7c6e066e 1654 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1655
1656 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1657}
1658
46c0ee8b
CL		 1659/**
1660 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1661 * @task: task that timed out
1662 *
1663 * Adjust the congestion window after a retransmit timeout has occurred.
1664 */
1665static void xs_udp_timer(struct rpc_task *task)
1666{
1667 xprt_adjust_cwnd(task, -ETIMEDOUT);
1668}
1669
b85d8806
CL		 1670static unsigned short xs_get_random_port(void)
1671{
1672 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1673 unsigned short rand = (unsigned short) net_random() % range;
1674 return rand + xprt_min_resvport;
1675}
1676
92200412
CL		 1677/**
1678 * xs_set_port - reset the port number in the remote endpoint address
1679 * @xprt: generic transport
1680 * @port: new port number
1681 *
1682 */
1683static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1684{
46121cf7 1685 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1686
9dc3b095
CL		 1687 rpc_set_port(xs_addr(xprt), port);
1688 xs_update_peer_port(xprt);
92200412
CL		 1689}
1690
5d4ec932 1691static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1692{
fbfffbd5 1693 unsigned short port = transport->srcport;
67a391d7
TM		 1694
1695 if (port == 0 && transport->xprt.resvport)
1696 port = xs_get_random_port();
1697 return port;
1698}
1699
baaf4e48 1700static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1701{
fbfffbd5
CL		 1702 if (transport->srcport != 0)
1703 transport->srcport = 0;
67a391d7
TM		 1704 if (!transport->xprt.resvport)
1705 return 0;
1706 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1707 return xprt_max_resvport;
1708 return --port;
1709}
beb59b68 1710static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1711{
beb59b68 1712 struct sockaddr_storage myaddr;
67a391d7 1713 int err, nloop = 0;
5d4ec932 1714 unsigned short port = xs_get_srcport(transport);
67a391d7 1715 unsigned short last;
a246b010 1716
beb59b68 1717 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1718 do {
beb59b68
PE		 1719 rpc_set_port((struct sockaddr *)&myaddr, port);
1720 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1721 transport->xprt.addrlen);
67a391d7 1722 if (port == 0)
d3bc9a1d 1723 break;
a246b010 1724 if (err == 0) {
fbfffbd5 1725 transport->srcport = port;
d3bc9a1d 1726 break;
a246b010 1727 }
67a391d7 1728 last = port;
baaf4e48 1729 port = xs_next_srcport(transport, port);
67a391d7
TM		 1730 if (port > last)
1731 nloop++;
1732 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1733
4232e863 1734 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1735 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1736 &((struct sockaddr_in *)&myaddr)->sin_addr,
1737 port, err ? "failed" : "ok", err);
1738 else
1739 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1740 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1741 port, err ? "failed" : "ok", err);
a246b010
CL		 1742 return err;
1743}
1744
176e21ee
CL		 1745/*
1746 * We don't support autobind on AF_LOCAL sockets
1747 */
1748static void xs_local_rpcbind(struct rpc_task *task)
1749{
1750 xprt_set_bound(task->tk_xprt);
1751}
1752
1753static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1754{
1755}
beb59b68 1756
ed07536e
PZ		 1757#ifdef CONFIG_DEBUG_LOCK_ALLOC
1758static struct lock_class_key xs_key[2];
1759static struct lock_class_key xs_slock_key[2];
1760
176e21ee
CL		 1761static inline void xs_reclassify_socketu(struct socket *sock)
1762{
1763 struct sock *sk = sock->sk;
1764
1765 BUG_ON(sock_owned_by_user(sk));
1766 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1767 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1768}
1769
8945ee5e 1770static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1771{
1772 struct sock *sk = sock->sk;
8945ee5e 1773
02b3d346 1774 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1775 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1776 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1777}
ed07536e 1778
8945ee5e
CL		 1779static inline void xs_reclassify_socket6(struct socket *sock)
1780{
1781 struct sock *sk = sock->sk;
ed07536e 1782
f4921aff 1783 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1784 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1785 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1786}
6bc9638a
PE		 1787
1788static inline void xs_reclassify_socket(int family, struct socket *sock)
1789{
4232e863 1790 switch (family) {
176e21ee
CL		 1791 case AF_LOCAL:
1792 xs_reclassify_socketu(sock);
1793 break;
4232e863 1794 case AF_INET:
6bc9638a 1795 xs_reclassify_socket4(sock);
4232e863
CL		 1796 break;
1797 case AF_INET6:
6bc9638a 1798 xs_reclassify_socket6(sock);
4232e863
CL		 1799 break;
1800 }
6bc9638a 1801}
ed07536e 1802#else
176e21ee
CL		 1803static inline void xs_reclassify_socketu(struct socket *sock)
1804{
1805}
1806
8945ee5e
CL		 1807static inline void xs_reclassify_socket4(struct socket *sock)
1808{
1809}
1810
1811static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1812{
1813}
6bc9638a
PE		 1814
1815static inline void xs_reclassify_socket(int family, struct socket *sock)
1816{
1817}
ed07536e
PZ		 1818#endif
1819
6bc9638a
PE		 1820static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1821 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1822{
1823 struct socket *sock;
1824 int err;
1825
6bc9638a 1826 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1827 if (err < 0) {
1828 dprintk("RPC: can't create %d transport socket (%d).\n",
1829 protocol, -err);
1830 goto out;
1831 }
6bc9638a 1832 xs_reclassify_socket(family, sock);
22f79326 1833
4cea288a
BH		 1834 err = xs_bind(transport, sock);
1835 if (err) {
22f79326
PE		 1836 sock_release(sock);
1837 goto out;
1838 }
1839
1840 return sock;
1841out:
1842 return ERR_PTR(err);
1843}
1844
176e21ee
CL		 1845static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1846 struct socket *sock)
1847{
1848 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1849 xprt);
1850
1851 if (!transport->inet) {
1852 struct sock *sk = sock->sk;
1853
1854 write_lock_bh(&sk->sk_callback_lock);
1855
1856 xs_save_old_callbacks(transport, sk);
1857
1858 sk->sk_user_data = xprt;
1859 sk->sk_data_ready = xs_local_data_ready;
1860 sk->sk_write_space = xs_udp_write_space;
1861 sk->sk_error_report = xs_error_report;
1862 sk->sk_allocation = GFP_ATOMIC;
1863
1864 xprt_clear_connected(xprt);
1865
1866 /* Reset to new socket */
1867 transport->sock = sock;
1868 transport->inet = sk;
1869
1870 write_unlock_bh(&sk->sk_callback_lock);
1871 }
1872
1873 /* Tell the socket layer to start connecting... */
1874 xprt->stat.connect_count++;
1875 xprt->stat.connect_start = jiffies;
1876 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1877}
1878
1879/**
1880 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1881 * @xprt: RPC transport to connect
1882 * @transport: socket transport to connect
1883 * @create_sock: function to create a socket of the correct type
1884 *
1885 * Invoked by a work queue tasklet.
1886 */
1887static void xs_local_setup_socket(struct work_struct *work)
1888{
1889 struct sock_xprt *transport =
1890 container_of(work, struct sock_xprt, connect_worker.work);
1891 struct rpc_xprt *xprt = &transport->xprt;
1892 struct socket *sock;
1893 int status = -EIO;
1894
5cf02d09
JL		 1895 current->flags |= PF_FSTRANS;
1896
176e21ee
CL		 1897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1898 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1899 SOCK_STREAM, 0, &sock, 1);
1900 if (status < 0) {
1901 dprintk("RPC: can't create AF_LOCAL "
1902 "transport socket (%d).\n", -status);
1903 goto out;
1904 }
1905 xs_reclassify_socketu(sock);
1906
1907 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1908 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1909
1910 status = xs_local_finish_connecting(xprt, sock);
1911 switch (status) {
1912 case 0:
1913 dprintk("RPC: xprt %p connected to %s\n",
1914 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1915 xprt_set_connected(xprt);
1916 break;
1917 case -ENOENT:
1918 dprintk("RPC: xprt %p: socket %s does not exist\n",
1919 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1920 break;
1921 default:
1922 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1923 __func__, -status,
1924 xprt->address_strings[RPC_DISPLAY_ADDR]);
1925 }
1926
1927out:
1928 xprt_clear_connecting(xprt);
1929 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1930 current->flags &= ~PF_FSTRANS;
176e21ee
CL		 1931}
1932
a564b8f0
MG		 1933#ifdef CONFIG_SUNRPC_SWAP
1934static void xs_set_memalloc(struct rpc_xprt *xprt)
1935{
1936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1937 xprt);
1938
1939 if (xprt->swapper)
1940 sk_set_memalloc(transport->inet);
1941}
1942
1943/**
1944 * xs_swapper - Tag this transport as being used for swap.
1945 * @xprt: transport to tag
1946 * @enable: enable/disable
1947 *
1948 */
1949int xs_swapper(struct rpc_xprt *xprt, int enable)
1950{
1951 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1952 xprt);
1953 int err = 0;
1954
1955 if (enable) {
1956 xprt->swapper++;
1957 xs_set_memalloc(xprt);
1958 } else if (xprt->swapper) {
1959 xprt->swapper--;
1960 sk_clear_memalloc(transport->inet);
1961 }
1962
1963 return err;
1964}
1965EXPORT_SYMBOL_GPL(xs_swapper);
1966#else
1967static void xs_set_memalloc(struct rpc_xprt *xprt)
1968{
1969}
1970#endif
1971
16be2d20
CL		 1972static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1973{
1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1975
1976 if (!transport->inet) {
1977 struct sock *sk = sock->sk;
1978
1979 write_lock_bh(&sk->sk_callback_lock);
1980
2a9e1cfa
TM		 1981 xs_save_old_callbacks(transport, sk);
1982
16be2d20 1983 sk->sk_user_data = xprt;
16be2d20
CL		 1984 sk->sk_data_ready = xs_udp_data_ready;
1985 sk->sk_write_space = xs_udp_write_space;
482f32e6 1986 sk->sk_error_report = xs_error_report;
16be2d20
CL		 1987 sk->sk_no_check = UDP_CSUM_NORCV;
1988 sk->sk_allocation = GFP_ATOMIC;
1989
1990 xprt_set_connected(xprt);
1991
1992 /* Reset to new socket */
1993 transport->sock = sock;
1994 transport->inet = sk;
1995
a564b8f0
MG		 1996 xs_set_memalloc(xprt);
1997
16be2d20
CL		 1998 write_unlock_bh(&sk->sk_callback_lock);
1999 }
2000 xs_udp_do_set_buffer_size(xprt);
2001}
2002
8c14ff2a 2003static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2004{
34161db6
TM		 2005 struct sock_xprt *transport =
2006 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2007 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2008 struct socket *sock = transport->sock;
b65c0310 2009 int status = -EIO;
9903cd1c 2010
5cf02d09
JL		 2011 current->flags |= PF_FSTRANS;
2012
b0d93ad5 2013 /* Start by resetting any existing state */
fe315e76 2014 xs_reset_transport(transport);
8c14ff2a
PE		 2015 sock = xs_create_sock(xprt, transport,
2016 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2017 if (IS_ERR(sock))
b0d93ad5 2018 goto out;
68e220bd 2019
c740eff8
CL		 2020 dprintk("RPC: worker connecting xprt %p via %s to "
2021 "%s (port %s)\n", xprt,
2022 xprt->address_strings[RPC_DISPLAY_PROTO],
2023 xprt->address_strings[RPC_DISPLAY_ADDR],
2024 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2025
2026 xs_udp_finish_connecting(xprt, sock);
b0d93ad5
CL		 2027 status = 0;
2028out:
b0d93ad5 2029 xprt_clear_connecting(xprt);
7d1e8255 2030 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2031 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2032}
2033
3167e12c
CL		 2034/*
2035 * We need to preserve the port number so the reply cache on the server can
2036 * find our cached RPC replies when we get around to reconnecting.
2037 */
58dddac9 2038static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2039{
2040 int result;
3167e12c
CL		 2041 struct sockaddr any;
2042
58dddac9 2043 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2044
2045 /*
2046 * Disconnect the transport socket by doing a connect operation
2047 * with AF_UNSPEC. This should return immediately...
2048 */
2049 memset(&any, 0, sizeof(any));
2050 any.sa_family = AF_UNSPEC;
ee0ac0c2 2051 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
7d1e8255 2052 if (!result)
58dddac9 2053 xs_sock_mark_closed(&transport->xprt);
7d1e8255 2054 else
46121cf7 2055 dprintk("RPC: AF_UNSPEC connect return code %d\n",
3167e12c
CL		 2056 result);
2057}
2058
58dddac9 2059static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2060{
2061 unsigned int state = transport->inet->sk_state;
2062
669502ff
AC		 2063 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2064 /* we don't need to abort the connection if the socket
2065 * hasn't undergone a shutdown
2066 */
2067 if (transport->inet->sk_shutdown == 0)
2068 return;
2069 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2070 __func__, transport->inet->sk_shutdown);
2071 }
2072 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2073 /* we don't need to abort the connection if the socket
2074 * hasn't undergone a shutdown
2075 */
2076 if (transport->inet->sk_shutdown == 0)
2077 return;
2078 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2079 "sk_shutdown set to %d\n",
2080 __func__, transport->inet->sk_shutdown);
2081 }
58dddac9 2082 xs_abort_connection(transport);
40d2549d
TM		 2083}
2084
16be2d20 2085static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2086{
16be2d20 2087 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2088 int ret = -ENOTCONN;
edb267a6 2089
ee0ac0c2 2090 if (!transport->inet) {
b0d93ad5
CL		 2091 struct sock *sk = sock->sk;
2092
2093 write_lock_bh(&sk->sk_callback_lock);
2094
2a9e1cfa
TM		 2095 xs_save_old_callbacks(transport, sk);
2096
b0d93ad5 2097 sk->sk_user_data = xprt;
b0d93ad5
CL		 2098 sk->sk_data_ready = xs_tcp_data_ready;
2099 sk->sk_state_change = xs_tcp_state_change;
2100 sk->sk_write_space = xs_tcp_write_space;
482f32e6 2101 sk->sk_error_report = xs_error_report;
b079fa7b 2102 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2103
2104 /* socket options */
2105 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2106 sock_reset_flag(sk, SOCK_LINGER);
2107 tcp_sk(sk)->linger2 = 0;
2108 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2109
2110 xprt_clear_connected(xprt);
2111
2112 /* Reset to new socket */
ee0ac0c2
CL		 2113 transport->sock = sock;
2114 transport->inet = sk;
b0d93ad5
CL		 2115
2116 write_unlock_bh(&sk->sk_callback_lock);
2117 }
2118
01d37c42 2119 if (!xprt_bound(xprt))
fe19a96b 2120 goto out;
01d37c42 2121
a564b8f0
MG		 2122 xs_set_memalloc(xprt);
2123
b0d93ad5 2124 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2125 xprt->stat.connect_count++;
2126 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2127 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2128 switch (ret) {
2129 case 0:
2130 case -EINPROGRESS:
2131 /* SYN_SENT! */
2132 xprt->connect_cookie++;
2133 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2134 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2135 }
2136out:
2137 return ret;
16be2d20
CL		 2138}
2139
9903cd1c 2140/**
b61d59ff
TM		 2141 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2142 * @xprt: RPC transport to connect
2143 * @transport: socket transport to connect
2144 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2145 *
2146 * Invoked by a work queue tasklet.
a246b010 2147 */
cdd518d5 2148static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2149{
cdd518d5
PE		 2150 struct sock_xprt *transport =
2151 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2152 struct socket *sock = transport->sock;
a9f5f0f7 2153 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2154 int status = -EIO;
a246b010 2155
5cf02d09
JL		 2156 current->flags |= PF_FSTRANS;
2157
ee0ac0c2 2158 if (!sock) {
7d1e8255 2159 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2160 sock = xs_create_sock(xprt, transport,
2161 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2162 if (IS_ERR(sock)) {
2163 status = PTR_ERR(sock);
3167e12c
CL		 2164 goto out;
2165 }
7d1e8255
TM		 2166 } else {
2167 int abort_and_exit;
a246b010 2168
7d1e8255
TM		 2169 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2170 &xprt->state);
3167e12c 2171 /* "close" the socket, preserving the local port */
58dddac9 2172 xs_tcp_reuse_connection(transport);
a246b010 2173
7d1e8255
TM		 2174 if (abort_and_exit)
2175 goto out_eagain;
2176 }
a246b010 2177
c740eff8
CL		 2178 dprintk("RPC: worker connecting xprt %p via %s to "
2179 "%s (port %s)\n", xprt,
2180 xprt->address_strings[RPC_DISPLAY_PROTO],
2181 xprt->address_strings[RPC_DISPLAY_ADDR],
2182 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2183
16be2d20 2184 status = xs_tcp_finish_connecting(xprt, sock);
46121cf7
CL		 2185 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2186 xprt, -status, xprt_connected(xprt),
2187 sock->sk->sk_state);
2a491991 2188 switch (status) {
f75e6745
TM		 2189 default:
2190 printk("%s: connect returned unhandled error %d\n",
2191 __func__, status);
2192 case -EADDRNOTAVAIL:
2193 /* We're probably in TIME_WAIT. Get rid of existing socket,
2194 * and retry
2195 */
a519fc7a 2196 xs_tcp_force_close(xprt);
88b5ed73 2197 break;
8a2cec29
TM		 2198 case -ECONNREFUSED:
2199 case -ECONNRESET:
2200 case -ENETUNREACH:
2201 /* retry with existing socket, after a delay */
2a491991
TM		 2202 case 0:
2203 case -EINPROGRESS:
2204 case -EALREADY:
7d1e8255 2205 xprt_clear_connecting(xprt);
5cf02d09 2206 current->flags &= ~PF_FSTRANS;
7d1e8255 2207 return;
9fcfe0c8
TM		 2208 case -EINVAL:
2209 /* Happens, for instance, if the user specified a link
2210 * local IPv6 address without a scope-id.
2211 */
2212 goto out;
a246b010 2213 }
7d1e8255 2214out_eagain:
2a491991 2215 status = -EAGAIN;
a246b010 2216out:
68e220bd 2217 xprt_clear_connecting(xprt);
7d1e8255 2218 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2219 current->flags &= ~PF_FSTRANS;
68e220bd 2220}
b0d93ad5 2221
9903cd1c
CL		 2222/**
2223 * xs_connect - connect a socket to a remote endpoint
2224 * @task: address of RPC task that manages state of connect request
2225 *
2226 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2227 *
2228 * UDP socket connects are synchronous, but we use a work queue anyway
2229 * to guarantee that even unprivileged user processes can set up a
2230 * socket on a privileged port.
2231 *
2232 * If a UDP socket connect fails, the delay behavior here prevents
2233 * retry floods (hard mounts).
9903cd1c
CL		 2234 */
2235static void xs_connect(struct rpc_task *task)
a246b010
CL		 2236{
2237 struct rpc_xprt *xprt = task->tk_xprt;
ee0ac0c2 2238 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2239
09a21c41 2240 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2241 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2242 "seconds\n",
03bf4b70 2243 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2244 queue_delayed_work(rpciod_workqueue,
2245 &transport->connect_worker,
2246 xprt->reestablish_timeout);
03bf4b70 2247 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2248 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2249 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2250 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2251 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2252 } else {
46121cf7 2253 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2254 queue_delayed_work(rpciod_workqueue,
2255 &transport->connect_worker, 0);
a246b010
CL		 2256 }
2257}
2258
176e21ee
CL		 2259/**
2260 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2261 * @xprt: rpc_xprt struct containing statistics
2262 * @seq: output file
2263 *
2264 */
2265static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2266{
2267 long idle_time = 0;
2268
2269 if (xprt_connected(xprt))
2270 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2271
2272 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2273 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2274 xprt->stat.bind_count,
2275 xprt->stat.connect_count,
2276 xprt->stat.connect_time,
2277 idle_time,
2278 xprt->stat.sends,
2279 xprt->stat.recvs,
2280 xprt->stat.bad_xids,
2281 xprt->stat.req_u,
15a45206
AA		 2282 xprt->stat.bklog_u,
2283 xprt->stat.max_slots,
2284 xprt->stat.sending_u,
2285 xprt->stat.pending_u);
176e21ee
CL		 2286}
2287
262ca07d
CL		 2288/**
2289 * xs_udp_print_stats - display UDP socket-specifc stats
2290 * @xprt: rpc_xprt struct containing statistics
2291 * @seq: output file
2292 *
2293 */
2294static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2295{
c8475461
CL		 2296 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2297
15a45206
AA		 2298 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2299 "%lu %llu %llu\n",
fbfffbd5 2300 transport->srcport,
262ca07d
CL		 2301 xprt->stat.bind_count,
2302 xprt->stat.sends,
2303 xprt->stat.recvs,
2304 xprt->stat.bad_xids,
2305 xprt->stat.req_u,
15a45206
AA		 2306 xprt->stat.bklog_u,
2307 xprt->stat.max_slots,
2308 xprt->stat.sending_u,
2309 xprt->stat.pending_u);
262ca07d
CL		 2310}
2311
2312/**
2313 * xs_tcp_print_stats - display TCP socket-specifc stats
2314 * @xprt: rpc_xprt struct containing statistics
2315 * @seq: output file
2316 *
2317 */
2318static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2319{
c8475461 2320 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2321 long idle_time = 0;
2322
2323 if (xprt_connected(xprt))
2324 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2325
15a45206
AA		 2326 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2327 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2328 transport->srcport,
262ca07d
CL		 2329 xprt->stat.bind_count,
2330 xprt->stat.connect_count,
2331 xprt->stat.connect_time,
2332 idle_time,
2333 xprt->stat.sends,
2334 xprt->stat.recvs,
2335 xprt->stat.bad_xids,
2336 xprt->stat.req_u,
15a45206
AA		 2337 xprt->stat.bklog_u,
2338 xprt->stat.max_slots,
2339 xprt->stat.sending_u,
2340 xprt->stat.pending_u);
262ca07d
CL		 2341}
2342
4cfc7e60
RI		 2343/*
2344 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2345 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2346 * to use the server side send routines.
2347 */
5a51f13a 2348static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2349{
2350 struct page *page;
2351 struct rpc_buffer *buf;
2352
2353 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2354 page = alloc_page(GFP_KERNEL);
2355
2356 if (!page)
2357 return NULL;
2358
2359 buf = page_address(page);
2360 buf->len = PAGE_SIZE;
2361
2362 return buf->data;
2363}
2364
2365/*
2366 * Free the space allocated in the bc_alloc routine
2367 */
5a51f13a 2368static void bc_free(void *buffer)
4cfc7e60
RI		 2369{
2370 struct rpc_buffer *buf;
2371
2372 if (!buffer)
2373 return;
2374
2375 buf = container_of(buffer, struct rpc_buffer, data);
2376 free_page((unsigned long)buf);
2377}
2378
2379/*
2380 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2381 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2382 */
2383static int bc_sendto(struct rpc_rqst *req)
2384{
2385 int len;
2386 struct xdr_buf *xbufp = &req->rq_snd_buf;
2387 struct rpc_xprt *xprt = req->rq_xprt;
2388 struct sock_xprt *transport =
2389 container_of(xprt, struct sock_xprt, xprt);
2390 struct socket *sock = transport->sock;
2391 unsigned long headoff;
2392 unsigned long tailoff;
2393
61677eee 2394 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2395
2396 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2397 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2398 len = svc_send_common(sock, xbufp,
2399 virt_to_page(xbufp->head[0].iov_base), headoff,
2400 xbufp->tail[0].iov_base, tailoff);
2401
2402 if (len != xbufp->len) {
2403 printk(KERN_NOTICE "Error sending entire callback!\n");
2404 len = -EAGAIN;
2405 }
2406
2407 return len;
2408}
2409
2410/*
2411 * The send routine. Borrows from svc_send
2412 */
2413static int bc_send_request(struct rpc_task *task)
2414{
2415 struct rpc_rqst *req = task->tk_rqstp;
2416 struct svc_xprt *xprt;
2417 struct svc_sock *svsk;
2418 u32 len;
2419
2420 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2421 /*
2422 * Get the server socket associated with this callback xprt
2423 */
2424 xprt = req->rq_xprt->bc_xprt;
2425 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2426
2427 /*
2428 * Grab the mutex to serialize data as the connection is shared
2429 * with the fore channel
2430 */
2431 if (!mutex_trylock(&xprt->xpt_mutex)) {
2432 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2433 if (!mutex_trylock(&xprt->xpt_mutex))
2434 return -EAGAIN;
2435 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2436 }
2437 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2438 len = -ENOTCONN;
2439 else
2440 len = bc_sendto(req);
2441 mutex_unlock(&xprt->xpt_mutex);
2442
2443 if (len > 0)
2444 len = 0;
2445
2446 return len;
2447}
2448
2449/*
2450 * The close routine. Since this is client initiated, we do nothing
2451 */
2452
2453static void bc_close(struct rpc_xprt *xprt)
2454{
4cfc7e60
RI		 2455}
2456
2457/*
2458 * The xprt destroy routine. Again, because this connection is client
2459 * initiated, we do nothing
2460 */
2461
2462static void bc_destroy(struct rpc_xprt *xprt)
2463{
4cfc7e60
RI		 2464}
2465
176e21ee
CL		 2466static struct rpc_xprt_ops xs_local_ops = {
2467 .reserve_xprt = xprt_reserve_xprt,
2468 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2469 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2470 .rpcbind = xs_local_rpcbind,
2471 .set_port = xs_local_set_port,
2472 .connect = xs_connect,
2473 .buf_alloc = rpc_malloc,
2474 .buf_free = rpc_free,
2475 .send_request = xs_local_send_request,
2476 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2477 .close = xs_close,
2478 .destroy = xs_destroy,
2479 .print_stats = xs_local_print_stats,
2480};
2481
262965f5 2482static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2483 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2484 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2485 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2486 .alloc_slot = xprt_alloc_slot,
45160d62 2487 .rpcbind = rpcb_getport_async,
92200412 2488 .set_port = xs_set_port,
262965f5 2489 .connect = xs_connect,
02107148
CL		 2490 .buf_alloc = rpc_malloc,
2491 .buf_free = rpc_free,
262965f5 2492 .send_request = xs_udp_send_request,
fe3aca29 2493 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2494 .timer = xs_udp_timer,
a58dd398 2495 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2496 .close = xs_close,
2497 .destroy = xs_destroy,
262ca07d 2498 .print_stats = xs_udp_print_stats,
262965f5
CL		 2499};
2500
2501static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2502 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2503 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2504 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2505 .rpcbind = rpcb_getport_async,
92200412 2506 .set_port = xs_set_port,
0b9e7943 2507 .connect = xs_connect,
02107148
CL		 2508 .buf_alloc = rpc_malloc,
2509 .buf_free = rpc_free,
262965f5 2510 .send_request = xs_tcp_send_request,
fe3aca29 2511 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2512 .close = xs_tcp_close,
9903cd1c 2513 .destroy = xs_destroy,
262ca07d 2514 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2515};
2516
4cfc7e60
RI		 2517/*
2518 * The rpc_xprt_ops for the server backchannel
2519 */
2520
2521static struct rpc_xprt_ops bc_tcp_ops = {
2522 .reserve_xprt = xprt_reserve_xprt,
2523 .release_xprt = xprt_release_xprt,
84e28a30 2524 .alloc_slot = xprt_alloc_slot,
92769108 2525 .rpcbind = xs_local_rpcbind,
4cfc7e60
RI		 2526 .buf_alloc = bc_malloc,
2527 .buf_free = bc_free,
2528 .send_request = bc_send_request,
2529 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2530 .close = bc_close,
2531 .destroy = bc_destroy,
2532 .print_stats = xs_tcp_print_stats,
2533};
2534
92476850
CL		 2535static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2536{
2537 static const struct sockaddr_in sin = {
2538 .sin_family = AF_INET,
2539 .sin_addr.s_addr = htonl(INADDR_ANY),
2540 };
2541 static const struct sockaddr_in6 sin6 = {
2542 .sin6_family = AF_INET6,
2543 .sin6_addr = IN6ADDR_ANY_INIT,
2544 };
2545
2546 switch (family) {
176e21ee
CL		 2547 case AF_LOCAL:
2548 break;
92476850
CL		 2549 case AF_INET:
2550 memcpy(sap, &sin, sizeof(sin));
2551 break;
2552 case AF_INET6:
2553 memcpy(sap, &sin6, sizeof(sin6));
2554 break;
2555 default:
2556 dprintk("RPC: %s: Bad address family\n", __func__);
2557 return -EAFNOSUPPORT;
2558 }
2559 return 0;
2560}
2561
3c341b0b 2562static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2563 unsigned int slot_table_size,
2564 unsigned int max_slot_table_size)
c8541ecd
CL		 2565{
2566 struct rpc_xprt *xprt;
ffc2e518 2567 struct sock_xprt *new;
c8541ecd 2568
96802a09 2569 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2570 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2571 return ERR_PTR(-EBADF);
2572 }
2573
d9ba131d
TM		 2574 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2575 max_slot_table_size);
bd1722d4 2576 if (xprt == NULL) {
46121cf7
CL		 2577 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2578 "rpc_xprt\n");
c8541ecd
CL		 2579 return ERR_PTR(-ENOMEM);
2580 }
c8541ecd 2581
bd1722d4 2582 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2583 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2584 xprt->addrlen = args->addrlen;
d3bc9a1d 2585 if (args->srcaddr)
fbfffbd5 2586 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2587 else {
2588 int err;
2589 err = xs_init_anyaddr(args->dstaddr->sa_family,
2590 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2591 if (err != 0) {
2592 xprt_free(xprt);
92476850 2593 return ERR_PTR(err);
2aa13531 2594 }
92476850 2595 }
c8541ecd
CL		 2596
2597 return xprt;
2598}
2599
176e21ee
CL		 2600static const struct rpc_timeout xs_local_default_timeout = {
2601 .to_initval = 10 * HZ,
2602 .to_maxval = 10 * HZ,
2603 .to_retries = 2,
2604};
2605
2606/**
2607 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2608 * @args: rpc transport creation arguments
2609 *
2610 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2611 */
2612static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2613{
2614 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2615 struct sock_xprt *transport;
2616 struct rpc_xprt *xprt;
2617 struct rpc_xprt *ret;
2618
d9ba131d
TM		 2619 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2620 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2621 if (IS_ERR(xprt))
2622 return xprt;
2623 transport = container_of(xprt, struct sock_xprt, xprt);
2624
2625 xprt->prot = 0;
2626 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2627 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2628
2629 xprt->bind_timeout = XS_BIND_TO;
2630 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2631 xprt->idle_timeout = XS_IDLE_DISC_TO;
2632
2633 xprt->ops = &xs_local_ops;
2634 xprt->timeout = &xs_local_default_timeout;
2635
2636 switch (sun->sun_family) {
2637 case AF_LOCAL:
2638 if (sun->sun_path[0] != '/') {
2639 dprintk("RPC: bad AF_LOCAL address: %s\n",
2640 sun->sun_path);
2641 ret = ERR_PTR(-EINVAL);
2642 goto out_err;
2643 }
2644 xprt_set_bound(xprt);
2645 INIT_DELAYED_WORK(&transport->connect_worker,
2646 xs_local_setup_socket);
2647 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2648 break;
2649 default:
2650 ret = ERR_PTR(-EAFNOSUPPORT);
2651 goto out_err;
2652 }
2653
2654 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2655 xprt->address_strings[RPC_DISPLAY_ADDR]);
2656
2657 if (try_module_get(THIS_MODULE))
2658 return xprt;
2659 ret = ERR_PTR(-EINVAL);
2660out_err:
2661 xprt_free(xprt);
2662 return ret;
2663}
2664
2881ae74
TM		 2665static const struct rpc_timeout xs_udp_default_timeout = {
2666 .to_initval = 5 * HZ,
2667 .to_maxval = 30 * HZ,
2668 .to_increment = 5 * HZ,
2669 .to_retries = 5,
2670};
2671
9903cd1c
CL		 2672/**
2673 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2674 * @args: rpc transport creation arguments
9903cd1c
CL		 2675 *
2676 */
483066d6 2677static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2678{
8f9d5b1a 2679 struct sockaddr *addr = args->dstaddr;
c8541ecd 2680 struct rpc_xprt *xprt;
c8475461 2681 struct sock_xprt *transport;
0a68b0be 2682 struct rpc_xprt *ret;
a246b010 2683
d9ba131d
TM		 2684 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2685 xprt_udp_slot_table_entries);
c8541ecd
CL		 2686 if (IS_ERR(xprt))
2687 return xprt;
c8475461 2688 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2689
ec739ef0 2690 xprt->prot = IPPROTO_UDP;
808012fb 2691 xprt->tsh_size = 0;
a246b010
CL		 2692 /* XXX: header size can vary due to auth type, IPv6, etc. */
2693 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2694
03bf4b70 2695 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2696 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2697 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2698
262965f5 2699 xprt->ops = &xs_udp_ops;
a246b010 2700
ba7392bb 2701 xprt->timeout = &xs_udp_default_timeout;
a246b010 2702
8f9d5b1a
CL		 2703 switch (addr->sa_family) {
2704 case AF_INET:
2705 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2706 xprt_set_bound(xprt);
2707
2708 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2709 xs_udp_setup_socket);
9dc3b095 2710 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2711 break;
2712 case AF_INET6:
2713 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2714 xprt_set_bound(xprt);
2715
2716 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2717 xs_udp_setup_socket);
9dc3b095 2718 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2719 break;
2720 default:
0a68b0be
BF		 2721 ret = ERR_PTR(-EAFNOSUPPORT);
2722 goto out_err;
8f9d5b1a
CL		 2723 }
2724
c740eff8
CL		 2725 if (xprt_bound(xprt))
2726 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2727 xprt->address_strings[RPC_DISPLAY_ADDR],
2728 xprt->address_strings[RPC_DISPLAY_PORT],
2729 xprt->address_strings[RPC_DISPLAY_PROTO]);
2730 else
2731 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2732 xprt->address_strings[RPC_DISPLAY_ADDR],
2733 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2734
bc25571e
TT		 2735 if (try_module_get(THIS_MODULE))
2736 return xprt;
0a68b0be
BF		 2737 ret = ERR_PTR(-EINVAL);
2738out_err:
e204e621 2739 xprt_free(xprt);
0a68b0be 2740 return ret;
a246b010
CL		 2741}
2742
2881ae74
TM		 2743static const struct rpc_timeout xs_tcp_default_timeout = {
2744 .to_initval = 60 * HZ,
2745 .to_maxval = 60 * HZ,
2746 .to_retries = 2,
2747};
2748
9903cd1c
CL		 2749/**
2750 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2751 * @args: rpc transport creation arguments
9903cd1c
CL		 2752 *
2753 */
483066d6 2754static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2755{
8f9d5b1a 2756 struct sockaddr *addr = args->dstaddr;
c8541ecd 2757 struct rpc_xprt *xprt;
c8475461 2758 struct sock_xprt *transport;
0a68b0be 2759 struct rpc_xprt *ret;
a246b010 2760
d9ba131d
TM		 2761 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2762 xprt_max_tcp_slot_table_entries);
c8541ecd
CL		 2763 if (IS_ERR(xprt))
2764 return xprt;
c8475461 2765 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2766
ec739ef0 2767 xprt->prot = IPPROTO_TCP;
808012fb 2768 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2769 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2770
03bf4b70 2771 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2772 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2773 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2774
262965f5 2775 xprt->ops = &xs_tcp_ops;
ba7392bb 2776 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2777
8f9d5b1a
CL		 2778 switch (addr->sa_family) {
2779 case AF_INET:
2780 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2781 xprt_set_bound(xprt);
2782
9dc3b095 2783 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2784 xs_tcp_setup_socket);
9dc3b095 2785 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2786 break;
2787 case AF_INET6:
2788 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2789 xprt_set_bound(xprt);
2790
9dc3b095 2791 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2792 xs_tcp_setup_socket);
9dc3b095 2793 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2794 break;
2795 default:
0a68b0be
BF		 2796 ret = ERR_PTR(-EAFNOSUPPORT);
2797 goto out_err;
8f9d5b1a
CL		 2798 }
2799
c740eff8
CL		 2800 if (xprt_bound(xprt))
2801 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2802 xprt->address_strings[RPC_DISPLAY_ADDR],
2803 xprt->address_strings[RPC_DISPLAY_PORT],
2804 xprt->address_strings[RPC_DISPLAY_PROTO]);
2805 else
2806 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2807 xprt->address_strings[RPC_DISPLAY_ADDR],
2808 xprt->address_strings[RPC_DISPLAY_PROTO]);
2809
edb267a6 2810
bc25571e
TT		 2811 if (try_module_get(THIS_MODULE))
2812 return xprt;
0a68b0be
BF		 2813 ret = ERR_PTR(-EINVAL);
2814out_err:
e204e621 2815 xprt_free(xprt);
0a68b0be 2816 return ret;
a246b010 2817}
282b32e1 2818
f300baba
AB		 2819/**
2820 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2821 * @args: rpc transport creation arguments
2822 *
2823 */
2824static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2825{
2826 struct sockaddr *addr = args->dstaddr;
2827 struct rpc_xprt *xprt;
2828 struct sock_xprt *transport;
2829 struct svc_sock *bc_sock;
0a68b0be 2830 struct rpc_xprt *ret;
f300baba 2831
f0418aa4
BF		 2832 if (args->bc_xprt->xpt_bc_xprt) {
2833 /*
2834 * This server connection already has a backchannel
2835 * export; we can't create a new one, as we wouldn't be
2836 * able to match replies based on xid any more. So,
2837 * reuse the already-existing one:
2838 */
2839 return args->bc_xprt->xpt_bc_xprt;
2840 }
d9ba131d
TM		 2841 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2842 xprt_tcp_slot_table_entries);
f300baba
AB		 2843 if (IS_ERR(xprt))
2844 return xprt;
2845 transport = container_of(xprt, struct sock_xprt, xprt);
2846
2847 xprt->prot = IPPROTO_TCP;
2848 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2849 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2850 xprt->timeout = &xs_tcp_default_timeout;
2851
2852 /* backchannel */
2853 xprt_set_bound(xprt);
2854 xprt->bind_timeout = 0;
f300baba
AB		 2855 xprt->reestablish_timeout = 0;
2856 xprt->idle_timeout = 0;
2857
f300baba
AB		 2858 xprt->ops = &bc_tcp_ops;
2859
2860 switch (addr->sa_family) {
2861 case AF_INET:
2862 xs_format_peer_addresses(xprt, "tcp",
2863 RPCBIND_NETID_TCP);
2864 break;
2865 case AF_INET6:
2866 xs_format_peer_addresses(xprt, "tcp",
2867 RPCBIND_NETID_TCP6);
2868 break;
2869 default:
0a68b0be
BF		 2870 ret = ERR_PTR(-EAFNOSUPPORT);
2871 goto out_err;
f300baba
AB		 2872 }
2873
50fa0d40
PE		 2874 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2875 xprt->address_strings[RPC_DISPLAY_ADDR],
2876 xprt->address_strings[RPC_DISPLAY_PORT],
2877 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2878
99de8ea9
BF		 2879 /*
2880 * Once we've associated a backchannel xprt with a connection,
2881 * we want to keep it around as long as long as the connection
2882 * lasts, in case we need to start using it for a backchannel
2883 * again; this reference won't be dropped until bc_xprt is
2884 * destroyed.
2885 */
2886 xprt_get(xprt);
2887 args->bc_xprt->xpt_bc_xprt = xprt;
2888 xprt->bc_xprt = args->bc_xprt;
2889 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2890 transport->sock = bc_sock->sk_sock;
2891 transport->inet = bc_sock->sk_sk;
2892
f300baba
AB		 2893 /*
2894 * Since we don't want connections for the backchannel, we set
2895 * the xprt status to connected
2896 */
2897 xprt_set_connected(xprt);
2898
2899
2900 if (try_module_get(THIS_MODULE))
2901 return xprt;
99de8ea9 2902 xprt_put(xprt);
0a68b0be
BF		 2903 ret = ERR_PTR(-EINVAL);
2904out_err:
e204e621 2905 xprt_free(xprt);
0a68b0be 2906 return ret;
f300baba
AB		 2907}
2908
176e21ee
CL		 2909static struct xprt_class xs_local_transport = {
2910 .list = LIST_HEAD_INIT(xs_local_transport.list),
2911 .name = "named UNIX socket",
2912 .owner = THIS_MODULE,
2913 .ident = XPRT_TRANSPORT_LOCAL,
2914 .setup = xs_setup_local,
2915};
2916
bc25571e
TT		 2917static struct xprt_class xs_udp_transport = {
2918 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2919 .name = "udp",
2920 .owner = THIS_MODULE,
f300baba 2921 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2922 .setup = xs_setup_udp,
2923};
2924
2925static struct xprt_class xs_tcp_transport = {
2926 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2927 .name = "tcp",
2928 .owner = THIS_MODULE,
f300baba 2929 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2930 .setup = xs_setup_tcp,
2931};
2932
f300baba
AB		 2933static struct xprt_class xs_bc_tcp_transport = {
2934 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2935 .name = "tcp NFSv4.1 backchannel",
2936 .owner = THIS_MODULE,
2937 .ident = XPRT_TRANSPORT_BC_TCP,
2938 .setup = xs_setup_bc_tcp,
2939};
2940
282b32e1 2941/**
bc25571e 2942 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2943 *
2944 */
2945int init_socket_xprt(void)
2946{
fbf76683 2947#ifdef RPC_DEBUG
2b1bec5f 2948 if (!sunrpc_table_header)
0b4d4147 2949 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2950#endif
2951
176e21ee 2952 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2953 xprt_register_transport(&xs_udp_transport);
2954 xprt_register_transport(&xs_tcp_transport);
f300baba 2955 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2956
282b32e1
CL		 2957 return 0;
2958}
2959
2960/**
bc25571e 2961 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2962 *
2963 */
2964void cleanup_socket_xprt(void)
2965{
fbf76683
CL		 2966#ifdef RPC_DEBUG
2967 if (sunrpc_table_header) {
2968 unregister_sysctl_table(sunrpc_table_header);
2969 sunrpc_table_header = NULL;
2970 }
2971#endif
bc25571e 2972
176e21ee 2973 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2974 xprt_unregister_transport(&xs_udp_transport);
2975 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2976 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2977}
cbf11071 2978
9bbb9e5a
RR		 2979static int param_set_uint_minmax(const char *val,
2980 const struct kernel_param *kp,
cbf11071
TM		 2981 unsigned int min, unsigned int max)
2982{
2983 unsigned long num;
2984 int ret;
2985
2986 if (!val)
2987 return -EINVAL;
2988 ret = strict_strtoul(val, 0, &num);
2989 if (ret == -EINVAL || num < min || num > max)
2990 return -EINVAL;
2991 *((unsigned int *)kp->arg) = num;
2992 return 0;
2993}
2994
9bbb9e5a 2995static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 2996{
2997 return param_set_uint_minmax(val, kp,
2998 RPC_MIN_RESVPORT,
2999 RPC_MAX_RESVPORT);
3000}
3001
9bbb9e5a
RR		 3002static struct kernel_param_ops param_ops_portnr = {
3003 .set = param_set_portnr,
3004 .get = param_get_uint,
3005};
3006
cbf11071
TM		 3007#define param_check_portnr(name, p) \
3008 __param_check(name, p, unsigned int);
3009
3010module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3011module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3012
9bbb9e5a
RR		 3013static int param_set_slot_table_size(const char *val,
3014 const struct kernel_param *kp)
cbf11071
TM		 3015{
3016 return param_set_uint_minmax(val, kp,
3017 RPC_MIN_SLOT_TABLE,
3018 RPC_MAX_SLOT_TABLE);
3019}
3020
9bbb9e5a
RR		 3021static struct kernel_param_ops param_ops_slot_table_size = {
3022 .set = param_set_slot_table_size,
3023 .get = param_get_uint,
3024};
3025
cbf11071
TM		 3026#define param_check_slot_table_size(name, p) \
3027 __param_check(name, p, unsigned int);
3028
d9ba131d
TM		 3029static int param_set_max_slot_table_size(const char *val,
3030 const struct kernel_param *kp)
3031{
3032 return param_set_uint_minmax(val, kp,
3033 RPC_MIN_SLOT_TABLE,
3034 RPC_MAX_SLOT_TABLE_LIMIT);
3035}
3036
3037static struct kernel_param_ops param_ops_max_slot_table_size = {
3038 .set = param_set_max_slot_table_size,
3039 .get = param_get_uint,
3040};
3041
3042#define param_check_max_slot_table_size(name, p) \
3043 __param_check(name, p, unsigned int);
3044
cbf11071
TM		 3045module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3046 slot_table_size, 0644);
d9ba131d
TM		 3047module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3048 max_slot_table_size, 0644);
cbf11071
TM		 3049module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3050 slot_table_size, 0644);
3051
Linux 6.x block layer and io_uring tree(s)