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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux-block.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
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
920 if (xprt->shutdown)
921 goto dropit;
922
923 repsize = skb->len - sizeof(rpc_fraghdr);
924 if (repsize < 4) {
925 dprintk("RPC: impossible RPC reply size %d\n", repsize);
926 goto dropit;
927 }
928
929 /* Copy the XID from the skb... */
930 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
931 if (xp == NULL)
932 goto dropit;
933
934 /* Look up and lock the request corresponding to the given XID */
935 spin_lock(&xprt->transport_lock);
936 rovr = xprt_lookup_rqst(xprt, *xp);
937 if (!rovr)
938 goto out_unlock;
939 task = rovr->rq_task;
940
941 copied = rovr->rq_private_buf.buflen;
942 if (copied > repsize)
943 copied = repsize;
944
945 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
946 dprintk("RPC: sk_buff copy failed\n");
947 goto out_unlock;
948 }
949
950 xprt_complete_rqst(task, copied);
951
952 out_unlock:
953 spin_unlock(&xprt->transport_lock);
954 dropit:
955 skb_free_datagram(sk, skb);
956 out:
957 read_unlock_bh(&sk->sk_callback_lock);
958}
959
9903cd1c
CL		 960/**
961 * xs_udp_data_ready - "data ready" callback for UDP sockets
962 * @sk: socket with data to read
963 * @len: how much data to read
964 *
a246b010 965 */
9903cd1c 966static void xs_udp_data_ready(struct sock *sk, int len)
a246b010 967{
9903cd1c
CL		 968 struct rpc_task *task;
969 struct rpc_xprt *xprt;
a246b010 970 struct rpc_rqst *rovr;
9903cd1c 971 struct sk_buff *skb;
a246b010 972 int err, repsize, copied;
d8ed029d
AD		 973 u32 _xid;
974 __be32 *xp;
a246b010 975
f064af1e 976 read_lock_bh(&sk->sk_callback_lock);
46121cf7 977 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 978 if (!(xprt = xprt_from_sock(sk)))
a246b010 979 goto out;
a246b010
CL		 980
981 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
982 goto out;
983
984 if (xprt->shutdown)
985 goto dropit;
986
987 repsize = skb->len - sizeof(struct udphdr);
988 if (repsize < 4) {
46121cf7 989 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 990 goto dropit;
991 }
992
993 /* Copy the XID from the skb... */
994 xp = skb_header_pointer(skb, sizeof(struct udphdr),
995 sizeof(_xid), &_xid);
996 if (xp == NULL)
997 goto dropit;
998
999 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 1000 spin_lock(&xprt->transport_lock);
a246b010
CL		 1001 rovr = xprt_lookup_rqst(xprt, *xp);
1002 if (!rovr)
1003 goto out_unlock;
1004 task = rovr->rq_task;
1005
a246b010
CL		 1006 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1007 copied = repsize;
1008
1009 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1010 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1011 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1012 goto out_unlock;
1781f7f5
HX		 1013 }
1014
1015 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1016
1570c1e4 1017 xprt_adjust_cwnd(task, copied);
1570c1e4 1018 xprt_complete_rqst(task, copied);
a246b010
CL		 1019
1020 out_unlock:
4a0f8c04 1021 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1022 dropit:
1023 skb_free_datagram(sk, skb);
1024 out:
f064af1e 1025 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1026}
1027
dd456471 1028static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1029{
51971139 1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1031 size_t len, used;
1032 char *p;
1033
51971139
CL		 1034 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1035 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1036 used = xdr_skb_read_bits(desc, p, len);
51971139 1037 transport->tcp_offset += used;
a246b010
CL		 1038 if (used != len)
1039 return;
808012fb 1040
51971139
CL		 1041 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1042 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1043 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1044 else
e136d092 1045 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1046 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1047
e136d092 1048 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1049 transport->tcp_offset = 0;
808012fb 1050
a246b010 1051 /* Sanity check of the record length */
18dca02a 1052 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1053 dprintk("RPC: invalid TCP record fragment length\n");
3ebb067d 1054 xprt_force_disconnect(xprt);
9903cd1c 1055 return;
a246b010 1056 }
46121cf7 1057 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1058 transport->tcp_reclen);
a246b010
CL		 1059}
1060
51971139 1061static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1062{
51971139 1063 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1064 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1065 transport->tcp_offset = 0;
e136d092
CL		 1066 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1067 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1068 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1069 transport->tcp_copied = 0;
a246b010
CL		 1070 }
1071 }
1072}
1073
dd456471 1074static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1075{
1076 size_t len, used;
1077 char *p;
1078
51971139 1079 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1080 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1081 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1082 used = xdr_skb_read_bits(desc, p, len);
51971139 1083 transport->tcp_offset += used;
a246b010
CL		 1084 if (used != len)
1085 return;
e136d092 1086 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1087 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1088 transport->tcp_copied = 4;
18dca02a
RL		 1089 dprintk("RPC: reading %s XID %08x\n",
1090 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1091 : "request with",
51971139
CL		 1092 ntohl(transport->tcp_xid));
1093 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1094}
1095
18dca02a
RL		 1096static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1097 struct xdr_skb_reader *desc)
a246b010 1098{
18dca02a
RL		 1099 size_t len, used;
1100 u32 offset;
b76ce561 1101 char *p;
18dca02a
RL		 1102
1103 /*
1104 * We want transport->tcp_offset to be 8 at the end of this routine
1105 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1106 * When this function is called for the first time,
1107 * transport->tcp_offset is 4 (after having already read the xid).
1108 */
1109 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1110 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1111 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1112 p = ((char *) &transport->tcp_calldir) + offset;
1113 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1114 transport->tcp_offset += used;
1115 if (used != len)
1116 return;
f4a2e418 1117 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1118 /*
1119 * We don't yet have the XDR buffer, so we will write the calldir
1120 * out after we get the buffer from the 'struct rpc_rqst'
1121 */
b76ce561
TM		 1122 switch (ntohl(transport->tcp_calldir)) {
1123 case RPC_REPLY:
1124 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1125 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1126 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1127 break;
1128 case RPC_CALL:
1129 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1130 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1131 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1132 break;
1133 default:
1134 dprintk("RPC: invalid request message type\n");
1135 xprt_force_disconnect(&transport->xprt);
1136 }
18dca02a
RL		 1137 xs_tcp_check_fraghdr(transport);
1138}
1139
44b98efd
RL		 1140static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1141 struct xdr_skb_reader *desc,
1142 struct rpc_rqst *req)
a246b010 1143{
44b98efd
RL		 1144 struct sock_xprt *transport =
1145 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1146 struct xdr_buf *rcvbuf;
1147 size_t len;
1148 ssize_t r;
1149
a246b010 1150 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1151
1152 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1153 /*
1154 * Save the RPC direction in the XDR buffer
1155 */
f4a2e418 1156 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1157 &transport->tcp_calldir,
1158 sizeof(transport->tcp_calldir));
1159 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1160 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1161 }
1162
a246b010 1163 len = desc->count;
51971139 1164 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1165 struct xdr_skb_reader my_desc;
a246b010 1166
51971139 1167 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1168 memcpy(&my_desc, desc, sizeof(my_desc));
1169 my_desc.count = len;
51971139 1170 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1171 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1172 desc->count -= r;
1173 desc->offset += r;
1174 } else
51971139 1175 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1176 desc, xdr_skb_read_bits);
a246b010
CL		 1177
1178 if (r > 0) {
51971139
CL		 1179 transport->tcp_copied += r;
1180 transport->tcp_offset += r;
a246b010
CL		 1181 }
1182 if (r != len) {
1183 /* Error when copying to the receive buffer,
1184 * usually because we weren't able to allocate
1185 * additional buffer pages. All we can do now
e136d092 1186 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1187 * will not receive any additional updates,
1188 * and time out.
1189 * Any remaining data from this record will
1190 * be discarded.
1191 */
e136d092 1192 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1193 dprintk("RPC: XID %08x truncated request\n",
51971139 1194 ntohl(transport->tcp_xid));
46121cf7
CL		 1195 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1196 "tcp_offset = %u, tcp_reclen = %u\n",
1197 xprt, transport->tcp_copied,
1198 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1199 return;
a246b010
CL		 1200 }
1201
46121cf7 1202 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1203 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1204 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1205 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1206 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1207
1208 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1209 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1210 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1211 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1212 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1213 }
44b98efd
RL		 1214}
1215
1216/*
1217 * Finds the request corresponding to the RPC xid and invokes the common
1218 * tcp read code to read the data.
1219 */
1220static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1221 struct xdr_skb_reader *desc)
1222{
1223 struct sock_xprt *transport =
1224 container_of(xprt, struct sock_xprt, xprt);
1225 struct rpc_rqst *req;
1226
1227 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1228
1229 /* Find and lock the request corresponding to this xid */
1230 spin_lock(&xprt->transport_lock);
1231 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1232 if (!req) {
1233 dprintk("RPC: XID %08x request not found!\n",
1234 ntohl(transport->tcp_xid));
1235 spin_unlock(&xprt->transport_lock);
1236 return -1;
1237 }
1238
1239 xs_tcp_read_common(xprt, desc, req);
1240
e136d092 1241 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1242 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1243
4a0f8c04 1244 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1245 return 0;
1246}
1247
9e00abc3 1248#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1249/*
1250 * Obtains an rpc_rqst previously allocated and invokes the common
1251 * tcp read code to read the data. The result is placed in the callback
1252 * queue.
1253 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1254 * connection and return -1.
1255 */
1256static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1257 struct xdr_skb_reader *desc)
1258{
1259 struct sock_xprt *transport =
1260 container_of(xprt, struct sock_xprt, xprt);
1261 struct rpc_rqst *req;
1262
1263 req = xprt_alloc_bc_request(xprt);
1264 if (req == NULL) {
1265 printk(KERN_WARNING "Callback slot table overflowed\n");
1266 xprt_force_disconnect(xprt);
1267 return -1;
1268 }
1269
1270 req->rq_xid = transport->tcp_xid;
1271 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1272 xs_tcp_read_common(xprt, desc, req);
1273
1274 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1275 struct svc_serv *bc_serv = xprt->bc_serv;
1276
1277 /*
1278 * Add callback request to callback list. The callback
1279 * service sleeps on the sv_cb_waitq waiting for new
1280 * requests. Wake it up after adding enqueing the
1281 * request.
1282 */
1283 dprintk("RPC: add callback request to list\n");
1284 spin_lock(&bc_serv->sv_cb_lock);
1285 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1286 spin_unlock(&bc_serv->sv_cb_lock);
1287 wake_up(&bc_serv->sv_cb_waitq);
1288 }
1289
1290 req->rq_private_buf.len = transport->tcp_copied;
1291
1292 return 0;
1293}
1294
1295static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1296 struct xdr_skb_reader *desc)
1297{
1298 struct sock_xprt *transport =
1299 container_of(xprt, struct sock_xprt, xprt);
1300
1301 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1302 xs_tcp_read_reply(xprt, desc) :
1303 xs_tcp_read_callback(xprt, desc);
1304}
1305#else
1306static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1307 struct xdr_skb_reader *desc)
1308{
1309 return xs_tcp_read_reply(xprt, desc);
1310}
9e00abc3 1311#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1312
1313/*
1314 * Read data off the transport. This can be either an RPC_CALL or an
1315 * RPC_REPLY. Relay the processing to helper functions.
1316 */
1317static void xs_tcp_read_data(struct rpc_xprt *xprt,
1318 struct xdr_skb_reader *desc)
1319{
1320 struct sock_xprt *transport =
1321 container_of(xprt, struct sock_xprt, xprt);
1322
1323 if (_xs_tcp_read_data(xprt, desc) == 0)
1324 xs_tcp_check_fraghdr(transport);
1325 else {
1326 /*
1327 * The transport_lock protects the request handling.
1328 * There's no need to hold it to update the tcp_flags.
1329 */
1330 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1331 }
a246b010
CL		 1332}
1333
dd456471 1334static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1335{
1336 size_t len;
1337
51971139 1338 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1339 if (len > desc->count)
1340 len = desc->count;
1341 desc->count -= len;
1342 desc->offset += len;
51971139 1343 transport->tcp_offset += len;
46121cf7 1344 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1345 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1346}
1347
9903cd1c 1348static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1349{
1350 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1351 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1352 struct xdr_skb_reader desc = {
a246b010
CL		 1353 .skb = skb,
1354 .offset = offset,
1355 .count = len,
9903cd1c 1356 };
a246b010 1357
46121cf7 1358 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1359 do {
1360 /* Read in a new fragment marker if necessary */
1361 /* Can we ever really expect to get completely empty fragments? */
e136d092 1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1363 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1364 continue;
1365 }
1366 /* Read in the xid if necessary */
e136d092 1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1368 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1369 continue;
1370 }
18dca02a 1371 /* Read in the call/reply flag */
f4a2e418 1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1373 xs_tcp_read_calldir(transport, &desc);
1374 continue;
1375 }
a246b010 1376 /* Read in the request data */
e136d092 1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1378 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1379 continue;
1380 }
1381 /* Skip over any trailing bytes on short reads */
51971139 1382 xs_tcp_read_discard(transport, &desc);
a246b010 1383 } while (desc.count);
46121cf7 1384 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1385 return len - desc.count;
1386}
1387
9903cd1c
CL		 1388/**
1389 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1390 * @sk: socket with data to read
1391 * @bytes: how much data to read
1392 *
1393 */
1394static void xs_tcp_data_ready(struct sock *sk, int bytes)
a246b010
CL		 1395{
1396 struct rpc_xprt *xprt;
1397 read_descriptor_t rd_desc;
ff2d7db8 1398 int read;
a246b010 1399
46121cf7
CL		 1400 dprintk("RPC: xs_tcp_data_ready...\n");
1401
f064af1e 1402 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1403 if (!(xprt = xprt_from_sock(sk)))
a246b010 1404 goto out;
a246b010
CL		 1405 if (xprt->shutdown)
1406 goto out;
1407
61d0a8e6
NB		 1408 /* Any data means we had a useful conversation, so
1409 * the we don't need to delay the next reconnect
1410 */
1411 if (xprt->reestablish_timeout)
1412 xprt->reestablish_timeout = 0;
1413
9903cd1c 1414 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1415 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1416 do {
1417 rd_desc.count = 65536;
1418 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1419 } while (read > 0);
a246b010 1420out:
f064af1e 1421 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1422}
1423
7d1e8255
TM		 1424/*
1425 * Do the equivalent of linger/linger2 handling for dealing with
1426 * broken servers that don't close the socket in a timely
1427 * fashion
1428 */
1429static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1430 unsigned long timeout)
1431{
1432 struct sock_xprt *transport;
1433
1434 if (xprt_test_and_set_connecting(xprt))
1435 return;
1436 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1437 transport = container_of(xprt, struct sock_xprt, xprt);
1438 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1439 timeout);
1440}
1441
1442static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1443{
1444 struct sock_xprt *transport;
1445
1446 transport = container_of(xprt, struct sock_xprt, xprt);
1447
1448 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1449 !cancel_delayed_work(&transport->connect_worker))
1450 return;
1451 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1452 xprt_clear_connecting(xprt);
1453}
1454
1455static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1456{
1457 smp_mb__before_clear_bit();
1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1459 clear_bit(XPRT_CLOSING, &xprt->state);
1460 smp_mb__after_clear_bit();
1461 /* Mark transport as closed and wake up all pending tasks */
1462 xprt_disconnect_done(xprt);
1463}
1464
9903cd1c
CL		 1465/**
1466 * xs_tcp_state_change - callback to handle TCP socket state changes
1467 * @sk: socket whose state has changed
1468 *
1469 */
1470static void xs_tcp_state_change(struct sock *sk)
a246b010 1471{
9903cd1c 1472 struct rpc_xprt *xprt;
a246b010 1473
f064af1e 1474 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1475 if (!(xprt = xprt_from_sock(sk)))
1476 goto out;
46121cf7 1477 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1478 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1479 sk->sk_state, xprt_connected(xprt),
1480 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1481 sock_flag(sk, SOCK_ZAPPED),
1482 sk->sk_shutdown);
a246b010
CL		 1483
1484 switch (sk->sk_state) {
1485 case TCP_ESTABLISHED:
f064af1e 1486 spin_lock(&xprt->transport_lock);
a246b010 1487 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1488 struct sock_xprt *transport = container_of(xprt,
1489 struct sock_xprt, xprt);
1490
a246b010 1491 /* Reset TCP record info */
51971139
CL		 1492 transport->tcp_offset = 0;
1493 transport->tcp_reclen = 0;
1494 transport->tcp_copied = 0;
e136d092
CL		 1495 transport->tcp_flags =
1496 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
51971139 1497
2a491991 1498 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1499 }
f064af1e 1500 spin_unlock(&xprt->transport_lock);
a246b010 1501 break;
3b948ae5
TM		 1502 case TCP_FIN_WAIT1:
1503 /* The client initiated a shutdown of the socket */
7c1d71cf 1504 xprt->connect_cookie++;
663b8858 1505 xprt->reestablish_timeout = 0;
3b948ae5
TM		 1506 set_bit(XPRT_CLOSING, &xprt->state);
1507 smp_mb__before_clear_bit();
1508 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1509 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 1510 smp_mb__after_clear_bit();
25fe6142 1511 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1512 break;
632e3bdc 1513 case TCP_CLOSE_WAIT:
3b948ae5 1514 /* The server initiated a shutdown of the socket */
66af1e55 1515 xprt_force_disconnect(xprt);
7c1d71cf 1516 xprt->connect_cookie++;
663b8858
TM		 1517 case TCP_CLOSING:
1518 /*
1519 * If the server closed down the connection, make sure that
1520 * we back off before reconnecting
1521 */
1522 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1523 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1524 break;
1525 case TCP_LAST_ACK:
670f9457 1526 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1527 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1528 smp_mb__before_clear_bit();
1529 clear_bit(XPRT_CONNECTED, &xprt->state);
1530 smp_mb__after_clear_bit();
1531 break;
1532 case TCP_CLOSE:
7d1e8255
TM		 1533 xs_tcp_cancel_linger_timeout(xprt);
1534 xs_sock_mark_closed(xprt);
a246b010
CL		 1535 }
1536 out:
f064af1e 1537 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1538}
1539
2a9e1cfa 1540/**
482f32e6 1541 * xs_error_report - callback mainly for catching socket errors
2a9e1cfa
TM		 1542 * @sk: socket
1543 */
482f32e6 1544static void xs_error_report(struct sock *sk)
2a9e1cfa
TM		 1545{
1546 struct rpc_xprt *xprt;
1547
f064af1e 1548 read_lock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1549 if (!(xprt = xprt_from_sock(sk)))
1550 goto out;
1551 dprintk("RPC: %s client %p...\n"
1552 "RPC: error %d\n",
1553 __func__, xprt, sk->sk_err);
482f32e6 1554 xprt_wake_pending_tasks(xprt, -EAGAIN);
2a9e1cfa 1555out:
f064af1e 1556 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 1557}
1558
1f0fa154
IJ		 1559static void xs_write_space(struct sock *sk)
1560{
1561 struct socket *sock;
1562 struct rpc_xprt *xprt;
1563
1564 if (unlikely(!(sock = sk->sk_socket)))
1565 return;
1566 clear_bit(SOCK_NOSPACE, &sock->flags);
1567
1568 if (unlikely(!(xprt = xprt_from_sock(sk))))
1569 return;
1570 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1571 return;
1572
1573 xprt_write_space(xprt);
1574}
1575
9903cd1c 1576/**
c7b2cae8
CL		 1577 * xs_udp_write_space - callback invoked when socket buffer space
1578 * becomes available
9903cd1c
CL		 1579 * @sk: socket whose state has changed
1580 *
a246b010
CL		 1581 * Called when more output buffer space is available for this socket.
1582 * We try not to wake our writers until they can make "significant"
c7b2cae8 1583 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1584 * with a bunch of small requests.
1585 */
c7b2cae8 1586static void xs_udp_write_space(struct sock *sk)
a246b010 1587{
f064af1e 1588 read_lock_bh(&sk->sk_callback_lock);
a246b010 1589
c7b2cae8 1590 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1591 if (sock_writeable(sk))
1592 xs_write_space(sk);
a246b010 1593
f064af1e 1594 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1595}
a246b010 1596
c7b2cae8
CL		 1597/**
1598 * xs_tcp_write_space - callback invoked when socket buffer space
1599 * becomes available
1600 * @sk: socket whose state has changed
1601 *
1602 * Called when more output buffer space is available for this socket.
1603 * We try not to wake our writers until they can make "significant"
1604 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1605 * with a bunch of small requests.
1606 */
1607static void xs_tcp_write_space(struct sock *sk)
1608{
f064af1e 1609 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1610
1611 /* from net/core/stream.c:sk_stream_write_space */
1f0fa154
IJ		 1612 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1613 xs_write_space(sk);
b6ddf64f 1614
f064af1e 1615 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1616}
1617
470056c2 1618static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1619{
ee0ac0c2
CL		 1620 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1621 struct sock *sk = transport->inet;
a246b010 1622
7c6e066e 1623 if (transport->rcvsize) {
a246b010 1624 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1625 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1626 }
7c6e066e 1627 if (transport->sndsize) {
a246b010 1628 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1629 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1630 sk->sk_write_space(sk);
1631 }
1632}
1633
43118c29 1634/**
470056c2 1635 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1636 * @xprt: generic transport
470056c2
CL		 1637 * @sndsize: requested size of send buffer, in bytes
1638 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1639 *
470056c2 1640 * Set socket send and receive buffer size limits.
43118c29 1641 */
470056c2 1642static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1643{
7c6e066e
CL		 1644 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1645
1646 transport->sndsize = 0;
470056c2 1647 if (sndsize)
7c6e066e
CL		 1648 transport->sndsize = sndsize + 1024;
1649 transport->rcvsize = 0;
470056c2 1650 if (rcvsize)
7c6e066e 1651 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1652
1653 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1654}
1655
46c0ee8b
CL		 1656/**
1657 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1658 * @task: task that timed out
1659 *
1660 * Adjust the congestion window after a retransmit timeout has occurred.
1661 */
1662static void xs_udp_timer(struct rpc_task *task)
1663{
1664 xprt_adjust_cwnd(task, -ETIMEDOUT);
1665}
1666
b85d8806
CL		 1667static unsigned short xs_get_random_port(void)
1668{
1669 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1670 unsigned short rand = (unsigned short) net_random() % range;
1671 return rand + xprt_min_resvport;
1672}
1673
92200412
CL		 1674/**
1675 * xs_set_port - reset the port number in the remote endpoint address
1676 * @xprt: generic transport
1677 * @port: new port number
1678 *
1679 */
1680static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1681{
46121cf7 1682 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1683
9dc3b095
CL		 1684 rpc_set_port(xs_addr(xprt), port);
1685 xs_update_peer_port(xprt);
92200412
CL		 1686}
1687
5d4ec932 1688static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1689{
fbfffbd5 1690 unsigned short port = transport->srcport;
67a391d7
TM		 1691
1692 if (port == 0 && transport->xprt.resvport)
1693 port = xs_get_random_port();
1694 return port;
1695}
1696
baaf4e48 1697static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1698{
fbfffbd5
CL		 1699 if (transport->srcport != 0)
1700 transport->srcport = 0;
67a391d7
TM		 1701 if (!transport->xprt.resvport)
1702 return 0;
1703 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1704 return xprt_max_resvport;
1705 return --port;
1706}
beb59b68 1707static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1708{
beb59b68 1709 struct sockaddr_storage myaddr;
67a391d7 1710 int err, nloop = 0;
5d4ec932 1711 unsigned short port = xs_get_srcport(transport);
67a391d7 1712 unsigned short last;
a246b010 1713
beb59b68 1714 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1715 do {
beb59b68
PE		 1716 rpc_set_port((struct sockaddr *)&myaddr, port);
1717 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1718 transport->xprt.addrlen);
67a391d7 1719 if (port == 0)
d3bc9a1d 1720 break;
a246b010 1721 if (err == 0) {
fbfffbd5 1722 transport->srcport = port;
d3bc9a1d 1723 break;
a246b010 1724 }
67a391d7 1725 last = port;
baaf4e48 1726 port = xs_next_srcport(transport, port);
67a391d7
TM		 1727 if (port > last)
1728 nloop++;
1729 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1730
4232e863 1731 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1732 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1733 &((struct sockaddr_in *)&myaddr)->sin_addr,
1734 port, err ? "failed" : "ok", err);
1735 else
1736 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1737 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1738 port, err ? "failed" : "ok", err);
a246b010
CL		 1739 return err;
1740}
1741
176e21ee
CL		 1742/*
1743 * We don't support autobind on AF_LOCAL sockets
1744 */
1745static void xs_local_rpcbind(struct rpc_task *task)
1746{
1747 xprt_set_bound(task->tk_xprt);
1748}
1749
1750static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1751{
1752}
beb59b68 1753
ed07536e
PZ		 1754#ifdef CONFIG_DEBUG_LOCK_ALLOC
1755static struct lock_class_key xs_key[2];
1756static struct lock_class_key xs_slock_key[2];
1757
176e21ee
CL		 1758static inline void xs_reclassify_socketu(struct socket *sock)
1759{
1760 struct sock *sk = sock->sk;
1761
1762 BUG_ON(sock_owned_by_user(sk));
1763 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1764 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1765}
1766
8945ee5e 1767static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1768{
1769 struct sock *sk = sock->sk;
8945ee5e 1770
02b3d346 1771 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1772 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1773 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1774}
ed07536e 1775
8945ee5e
CL		 1776static inline void xs_reclassify_socket6(struct socket *sock)
1777{
1778 struct sock *sk = sock->sk;
ed07536e 1779
f4921aff 1780 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1781 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1782 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1783}
6bc9638a
PE		 1784
1785static inline void xs_reclassify_socket(int family, struct socket *sock)
1786{
4232e863 1787 switch (family) {
176e21ee
CL		 1788 case AF_LOCAL:
1789 xs_reclassify_socketu(sock);
1790 break;
4232e863 1791 case AF_INET:
6bc9638a 1792 xs_reclassify_socket4(sock);
4232e863
CL		 1793 break;
1794 case AF_INET6:
6bc9638a 1795 xs_reclassify_socket6(sock);
4232e863
CL		 1796 break;
1797 }
6bc9638a 1798}
ed07536e 1799#else
176e21ee
CL		 1800static inline void xs_reclassify_socketu(struct socket *sock)
1801{
1802}
1803
8945ee5e
CL		 1804static inline void xs_reclassify_socket4(struct socket *sock)
1805{
1806}
1807
1808static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1809{
1810}
6bc9638a
PE		 1811
1812static inline void xs_reclassify_socket(int family, struct socket *sock)
1813{
1814}
ed07536e
PZ		 1815#endif
1816
6bc9638a
PE		 1817static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1818 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1819{
1820 struct socket *sock;
1821 int err;
1822
6bc9638a 1823 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1824 if (err < 0) {
1825 dprintk("RPC: can't create %d transport socket (%d).\n",
1826 protocol, -err);
1827 goto out;
1828 }
6bc9638a 1829 xs_reclassify_socket(family, sock);
22f79326 1830
4cea288a
BH		 1831 err = xs_bind(transport, sock);
1832 if (err) {
22f79326
PE		 1833 sock_release(sock);
1834 goto out;
1835 }
1836
1837 return sock;
1838out:
1839 return ERR_PTR(err);
1840}
1841
176e21ee
CL		 1842static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1843 struct socket *sock)
1844{
1845 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1846 xprt);
1847
1848 if (!transport->inet) {
1849 struct sock *sk = sock->sk;
1850
1851 write_lock_bh(&sk->sk_callback_lock);
1852
1853 xs_save_old_callbacks(transport, sk);
1854
1855 sk->sk_user_data = xprt;
1856 sk->sk_data_ready = xs_local_data_ready;
1857 sk->sk_write_space = xs_udp_write_space;
1858 sk->sk_error_report = xs_error_report;
1859 sk->sk_allocation = GFP_ATOMIC;
1860
1861 xprt_clear_connected(xprt);
1862
1863 /* Reset to new socket */
1864 transport->sock = sock;
1865 transport->inet = sk;
1866
1867 write_unlock_bh(&sk->sk_callback_lock);
1868 }
1869
1870 /* Tell the socket layer to start connecting... */
1871 xprt->stat.connect_count++;
1872 xprt->stat.connect_start = jiffies;
1873 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1874}
1875
1876/**
1877 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1878 * @xprt: RPC transport to connect
1879 * @transport: socket transport to connect
1880 * @create_sock: function to create a socket of the correct type
1881 *
1882 * Invoked by a work queue tasklet.
1883 */
1884static void xs_local_setup_socket(struct work_struct *work)
1885{
1886 struct sock_xprt *transport =
1887 container_of(work, struct sock_xprt, connect_worker.work);
1888 struct rpc_xprt *xprt = &transport->xprt;
1889 struct socket *sock;
1890 int status = -EIO;
1891
1892 if (xprt->shutdown)
1893 goto out;
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
01d37c42 2011 if (xprt->shutdown)
b0d93ad5 2012 goto out;
9903cd1c 2013
5cf02d09
JL		 2014 current->flags |= PF_FSTRANS;
2015
b0d93ad5 2016 /* Start by resetting any existing state */
fe315e76 2017 xs_reset_transport(transport);
8c14ff2a
PE		 2018 sock = xs_create_sock(xprt, transport,
2019 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2020 if (IS_ERR(sock))
b0d93ad5 2021 goto out;
68e220bd 2022
c740eff8
CL		 2023 dprintk("RPC: worker connecting xprt %p via %s to "
2024 "%s (port %s)\n", xprt,
2025 xprt->address_strings[RPC_DISPLAY_PROTO],
2026 xprt->address_strings[RPC_DISPLAY_ADDR],
2027 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2028
2029 xs_udp_finish_connecting(xprt, sock);
b0d93ad5
CL		 2030 status = 0;
2031out:
b0d93ad5 2032 xprt_clear_connecting(xprt);
7d1e8255 2033 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2034 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2035}
2036
3167e12c
CL		 2037/*
2038 * We need to preserve the port number so the reply cache on the server can
2039 * find our cached RPC replies when we get around to reconnecting.
2040 */
58dddac9 2041static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2042{
2043 int result;
3167e12c
CL		 2044 struct sockaddr any;
2045
58dddac9 2046 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2047
2048 /*
2049 * Disconnect the transport socket by doing a connect operation
2050 * with AF_UNSPEC. This should return immediately...
2051 */
2052 memset(&any, 0, sizeof(any));
2053 any.sa_family = AF_UNSPEC;
ee0ac0c2 2054 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
7d1e8255 2055 if (!result)
58dddac9 2056 xs_sock_mark_closed(&transport->xprt);
7d1e8255 2057 else
46121cf7 2058 dprintk("RPC: AF_UNSPEC connect return code %d\n",
3167e12c
CL		 2059 result);
2060}
2061
58dddac9 2062static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2063{
2064 unsigned int state = transport->inet->sk_state;
2065
669502ff
AC		 2066 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2067 /* we don't need to abort the connection if the socket
2068 * hasn't undergone a shutdown
2069 */
2070 if (transport->inet->sk_shutdown == 0)
2071 return;
2072 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2073 __func__, transport->inet->sk_shutdown);
2074 }
2075 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2076 /* we don't need to abort the connection if the socket
2077 * hasn't undergone a shutdown
2078 */
2079 if (transport->inet->sk_shutdown == 0)
2080 return;
2081 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2082 "sk_shutdown set to %d\n",
2083 __func__, transport->inet->sk_shutdown);
2084 }
58dddac9 2085 xs_abort_connection(transport);
40d2549d
TM		 2086}
2087
16be2d20 2088static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2089{
16be2d20 2090 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2091 int ret = -ENOTCONN;
edb267a6 2092
ee0ac0c2 2093 if (!transport->inet) {
b0d93ad5
CL		 2094 struct sock *sk = sock->sk;
2095
2096 write_lock_bh(&sk->sk_callback_lock);
2097
2a9e1cfa
TM		 2098 xs_save_old_callbacks(transport, sk);
2099
b0d93ad5 2100 sk->sk_user_data = xprt;
b0d93ad5
CL		 2101 sk->sk_data_ready = xs_tcp_data_ready;
2102 sk->sk_state_change = xs_tcp_state_change;
2103 sk->sk_write_space = xs_tcp_write_space;
482f32e6 2104 sk->sk_error_report = xs_error_report;
b079fa7b 2105 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2106
2107 /* socket options */
2108 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2109 sock_reset_flag(sk, SOCK_LINGER);
2110 tcp_sk(sk)->linger2 = 0;
2111 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2112
2113 xprt_clear_connected(xprt);
2114
2115 /* Reset to new socket */
ee0ac0c2
CL		 2116 transport->sock = sock;
2117 transport->inet = sk;
b0d93ad5
CL		 2118
2119 write_unlock_bh(&sk->sk_callback_lock);
2120 }
2121
01d37c42 2122 if (!xprt_bound(xprt))
fe19a96b 2123 goto out;
01d37c42 2124
a564b8f0
MG		 2125 xs_set_memalloc(xprt);
2126
b0d93ad5 2127 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2128 xprt->stat.connect_count++;
2129 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2130 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2131 switch (ret) {
2132 case 0:
2133 case -EINPROGRESS:
2134 /* SYN_SENT! */
2135 xprt->connect_cookie++;
2136 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2137 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2138 }
2139out:
2140 return ret;
16be2d20
CL		 2141}
2142
9903cd1c 2143/**
b61d59ff
TM		 2144 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2145 * @xprt: RPC transport to connect
2146 * @transport: socket transport to connect
2147 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2148 *
2149 * Invoked by a work queue tasklet.
a246b010 2150 */
cdd518d5 2151static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2152{
cdd518d5
PE		 2153 struct sock_xprt *transport =
2154 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2155 struct socket *sock = transport->sock;
a9f5f0f7 2156 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2157 int status = -EIO;
a246b010 2158
01d37c42 2159 if (xprt->shutdown)
a246b010
CL		 2160 goto out;
2161
5cf02d09
JL		 2162 current->flags |= PF_FSTRANS;
2163
ee0ac0c2 2164 if (!sock) {
7d1e8255 2165 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2166 sock = xs_create_sock(xprt, transport,
2167 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2168 if (IS_ERR(sock)) {
2169 status = PTR_ERR(sock);
3167e12c
CL		 2170 goto out;
2171 }
7d1e8255
TM		 2172 } else {
2173 int abort_and_exit;
a246b010 2174
7d1e8255
TM		 2175 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2176 &xprt->state);
3167e12c 2177 /* "close" the socket, preserving the local port */
58dddac9 2178 xs_tcp_reuse_connection(transport);
a246b010 2179
7d1e8255
TM		 2180 if (abort_and_exit)
2181 goto out_eagain;
2182 }
a246b010 2183
c740eff8
CL		 2184 dprintk("RPC: worker connecting xprt %p via %s to "
2185 "%s (port %s)\n", xprt,
2186 xprt->address_strings[RPC_DISPLAY_PROTO],
2187 xprt->address_strings[RPC_DISPLAY_ADDR],
2188 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2189
16be2d20 2190 status = xs_tcp_finish_connecting(xprt, sock);
46121cf7
CL		 2191 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2192 xprt, -status, xprt_connected(xprt),
2193 sock->sk->sk_state);
2a491991 2194 switch (status) {
f75e6745
TM		 2195 default:
2196 printk("%s: connect returned unhandled error %d\n",
2197 __func__, status);
2198 case -EADDRNOTAVAIL:
2199 /* We're probably in TIME_WAIT. Get rid of existing socket,
2200 * and retry
2201 */
2202 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
2203 xprt_force_disconnect(xprt);
88b5ed73 2204 break;
8a2cec29
TM		 2205 case -ECONNREFUSED:
2206 case -ECONNRESET:
2207 case -ENETUNREACH:
2208 /* retry with existing socket, after a delay */
2a491991
TM		 2209 case 0:
2210 case -EINPROGRESS:
2211 case -EALREADY:
7d1e8255 2212 xprt_clear_connecting(xprt);
5cf02d09 2213 current->flags &= ~PF_FSTRANS;
7d1e8255 2214 return;
9fcfe0c8
TM		 2215 case -EINVAL:
2216 /* Happens, for instance, if the user specified a link
2217 * local IPv6 address without a scope-id.
2218 */
2219 goto out;
a246b010 2220 }
7d1e8255 2221out_eagain:
2a491991 2222 status = -EAGAIN;
a246b010 2223out:
68e220bd 2224 xprt_clear_connecting(xprt);
7d1e8255 2225 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2226 current->flags &= ~PF_FSTRANS;
68e220bd 2227}
b0d93ad5 2228
9903cd1c
CL		 2229/**
2230 * xs_connect - connect a socket to a remote endpoint
2231 * @task: address of RPC task that manages state of connect request
2232 *
2233 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2234 *
2235 * UDP socket connects are synchronous, but we use a work queue anyway
2236 * to guarantee that even unprivileged user processes can set up a
2237 * socket on a privileged port.
2238 *
2239 * If a UDP socket connect fails, the delay behavior here prevents
2240 * retry floods (hard mounts).
9903cd1c
CL		 2241 */
2242static void xs_connect(struct rpc_task *task)
a246b010
CL		 2243{
2244 struct rpc_xprt *xprt = task->tk_xprt;
ee0ac0c2 2245 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2246
09a21c41 2247 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2248 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2249 "seconds\n",
03bf4b70 2250 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2251 queue_delayed_work(rpciod_workqueue,
2252 &transport->connect_worker,
2253 xprt->reestablish_timeout);
03bf4b70 2254 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2255 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2256 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2257 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2258 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2259 } else {
46121cf7 2260 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2261 queue_delayed_work(rpciod_workqueue,
2262 &transport->connect_worker, 0);
a246b010
CL		 2263 }
2264}
2265
176e21ee
CL		 2266/**
2267 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2268 * @xprt: rpc_xprt struct containing statistics
2269 * @seq: output file
2270 *
2271 */
2272static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2273{
2274 long idle_time = 0;
2275
2276 if (xprt_connected(xprt))
2277 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2278
2279 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2280 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2281 xprt->stat.bind_count,
2282 xprt->stat.connect_count,
2283 xprt->stat.connect_time,
2284 idle_time,
2285 xprt->stat.sends,
2286 xprt->stat.recvs,
2287 xprt->stat.bad_xids,
2288 xprt->stat.req_u,
15a45206
AA		 2289 xprt->stat.bklog_u,
2290 xprt->stat.max_slots,
2291 xprt->stat.sending_u,
2292 xprt->stat.pending_u);
176e21ee
CL		 2293}
2294
262ca07d
CL		 2295/**
2296 * xs_udp_print_stats - display UDP socket-specifc stats
2297 * @xprt: rpc_xprt struct containing statistics
2298 * @seq: output file
2299 *
2300 */
2301static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2302{
c8475461
CL		 2303 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2304
15a45206
AA		 2305 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2306 "%lu %llu %llu\n",
fbfffbd5 2307 transport->srcport,
262ca07d
CL		 2308 xprt->stat.bind_count,
2309 xprt->stat.sends,
2310 xprt->stat.recvs,
2311 xprt->stat.bad_xids,
2312 xprt->stat.req_u,
15a45206
AA		 2313 xprt->stat.bklog_u,
2314 xprt->stat.max_slots,
2315 xprt->stat.sending_u,
2316 xprt->stat.pending_u);
262ca07d
CL		 2317}
2318
2319/**
2320 * xs_tcp_print_stats - display TCP socket-specifc stats
2321 * @xprt: rpc_xprt struct containing statistics
2322 * @seq: output file
2323 *
2324 */
2325static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2326{
c8475461 2327 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2328 long idle_time = 0;
2329
2330 if (xprt_connected(xprt))
2331 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2332
15a45206
AA		 2333 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2334 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2335 transport->srcport,
262ca07d
CL		 2336 xprt->stat.bind_count,
2337 xprt->stat.connect_count,
2338 xprt->stat.connect_time,
2339 idle_time,
2340 xprt->stat.sends,
2341 xprt->stat.recvs,
2342 xprt->stat.bad_xids,
2343 xprt->stat.req_u,
15a45206
AA		 2344 xprt->stat.bklog_u,
2345 xprt->stat.max_slots,
2346 xprt->stat.sending_u,
2347 xprt->stat.pending_u);
262ca07d
CL		 2348}
2349
4cfc7e60
RI		 2350/*
2351 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2352 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2353 * to use the server side send routines.
2354 */
5a51f13a 2355static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2356{
2357 struct page *page;
2358 struct rpc_buffer *buf;
2359
2360 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2361 page = alloc_page(GFP_KERNEL);
2362
2363 if (!page)
2364 return NULL;
2365
2366 buf = page_address(page);
2367 buf->len = PAGE_SIZE;
2368
2369 return buf->data;
2370}
2371
2372/*
2373 * Free the space allocated in the bc_alloc routine
2374 */
5a51f13a 2375static void bc_free(void *buffer)
4cfc7e60
RI		 2376{
2377 struct rpc_buffer *buf;
2378
2379 if (!buffer)
2380 return;
2381
2382 buf = container_of(buffer, struct rpc_buffer, data);
2383 free_page((unsigned long)buf);
2384}
2385
2386/*
2387 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2388 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2389 */
2390static int bc_sendto(struct rpc_rqst *req)
2391{
2392 int len;
2393 struct xdr_buf *xbufp = &req->rq_snd_buf;
2394 struct rpc_xprt *xprt = req->rq_xprt;
2395 struct sock_xprt *transport =
2396 container_of(xprt, struct sock_xprt, xprt);
2397 struct socket *sock = transport->sock;
2398 unsigned long headoff;
2399 unsigned long tailoff;
2400
61677eee 2401 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2402
2403 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2404 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2405 len = svc_send_common(sock, xbufp,
2406 virt_to_page(xbufp->head[0].iov_base), headoff,
2407 xbufp->tail[0].iov_base, tailoff);
2408
2409 if (len != xbufp->len) {
2410 printk(KERN_NOTICE "Error sending entire callback!\n");
2411 len = -EAGAIN;
2412 }
2413
2414 return len;
2415}
2416
2417/*
2418 * The send routine. Borrows from svc_send
2419 */
2420static int bc_send_request(struct rpc_task *task)
2421{
2422 struct rpc_rqst *req = task->tk_rqstp;
2423 struct svc_xprt *xprt;
2424 struct svc_sock *svsk;
2425 u32 len;
2426
2427 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2428 /*
2429 * Get the server socket associated with this callback xprt
2430 */
2431 xprt = req->rq_xprt->bc_xprt;
2432 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2433
2434 /*
2435 * Grab the mutex to serialize data as the connection is shared
2436 * with the fore channel
2437 */
2438 if (!mutex_trylock(&xprt->xpt_mutex)) {
2439 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2440 if (!mutex_trylock(&xprt->xpt_mutex))
2441 return -EAGAIN;
2442 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2443 }
2444 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2445 len = -ENOTCONN;
2446 else
2447 len = bc_sendto(req);
2448 mutex_unlock(&xprt->xpt_mutex);
2449
2450 if (len > 0)
2451 len = 0;
2452
2453 return len;
2454}
2455
2456/*
2457 * The close routine. Since this is client initiated, we do nothing
2458 */
2459
2460static void bc_close(struct rpc_xprt *xprt)
2461{
4cfc7e60
RI		 2462}
2463
2464/*
2465 * The xprt destroy routine. Again, because this connection is client
2466 * initiated, we do nothing
2467 */
2468
2469static void bc_destroy(struct rpc_xprt *xprt)
2470{
4cfc7e60
RI		 2471}
2472
176e21ee
CL		 2473static struct rpc_xprt_ops xs_local_ops = {
2474 .reserve_xprt = xprt_reserve_xprt,
2475 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2476 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2477 .rpcbind = xs_local_rpcbind,
2478 .set_port = xs_local_set_port,
2479 .connect = xs_connect,
2480 .buf_alloc = rpc_malloc,
2481 .buf_free = rpc_free,
2482 .send_request = xs_local_send_request,
2483 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2484 .close = xs_close,
2485 .destroy = xs_destroy,
2486 .print_stats = xs_local_print_stats,
2487};
2488
262965f5 2489static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2490 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2491 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2492 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2493 .alloc_slot = xprt_alloc_slot,
45160d62 2494 .rpcbind = rpcb_getport_async,
92200412 2495 .set_port = xs_set_port,
262965f5 2496 .connect = xs_connect,
02107148
CL		 2497 .buf_alloc = rpc_malloc,
2498 .buf_free = rpc_free,
262965f5 2499 .send_request = xs_udp_send_request,
fe3aca29 2500 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2501 .timer = xs_udp_timer,
a58dd398 2502 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2503 .close = xs_close,
2504 .destroy = xs_destroy,
262ca07d 2505 .print_stats = xs_udp_print_stats,
262965f5
CL		 2506};
2507
2508static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2509 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2510 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2511 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2512 .rpcbind = rpcb_getport_async,
92200412 2513 .set_port = xs_set_port,
0b9e7943 2514 .connect = xs_connect,
02107148
CL		 2515 .buf_alloc = rpc_malloc,
2516 .buf_free = rpc_free,
262965f5 2517 .send_request = xs_tcp_send_request,
fe3aca29 2518 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2519 .close = xs_tcp_close,
9903cd1c 2520 .destroy = xs_destroy,
262ca07d 2521 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2522};
2523
4cfc7e60
RI		 2524/*
2525 * The rpc_xprt_ops for the server backchannel
2526 */
2527
2528static struct rpc_xprt_ops bc_tcp_ops = {
2529 .reserve_xprt = xprt_reserve_xprt,
2530 .release_xprt = xprt_release_xprt,
92769108 2531 .rpcbind = xs_local_rpcbind,
4cfc7e60
RI		 2532 .buf_alloc = bc_malloc,
2533 .buf_free = bc_free,
2534 .send_request = bc_send_request,
2535 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2536 .close = bc_close,
2537 .destroy = bc_destroy,
2538 .print_stats = xs_tcp_print_stats,
2539};
2540
92476850
CL		 2541static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2542{
2543 static const struct sockaddr_in sin = {
2544 .sin_family = AF_INET,
2545 .sin_addr.s_addr = htonl(INADDR_ANY),
2546 };
2547 static const struct sockaddr_in6 sin6 = {
2548 .sin6_family = AF_INET6,
2549 .sin6_addr = IN6ADDR_ANY_INIT,
2550 };
2551
2552 switch (family) {
176e21ee
CL		 2553 case AF_LOCAL:
2554 break;
92476850
CL		 2555 case AF_INET:
2556 memcpy(sap, &sin, sizeof(sin));
2557 break;
2558 case AF_INET6:
2559 memcpy(sap, &sin6, sizeof(sin6));
2560 break;
2561 default:
2562 dprintk("RPC: %s: Bad address family\n", __func__);
2563 return -EAFNOSUPPORT;
2564 }
2565 return 0;
2566}
2567
3c341b0b 2568static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2569 unsigned int slot_table_size,
2570 unsigned int max_slot_table_size)
c8541ecd
CL		 2571{
2572 struct rpc_xprt *xprt;
ffc2e518 2573 struct sock_xprt *new;
c8541ecd 2574
96802a09 2575 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2576 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2577 return ERR_PTR(-EBADF);
2578 }
2579
d9ba131d
TM		 2580 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2581 max_slot_table_size);
bd1722d4 2582 if (xprt == NULL) {
46121cf7
CL		 2583 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2584 "rpc_xprt\n");
c8541ecd
CL		 2585 return ERR_PTR(-ENOMEM);
2586 }
c8541ecd 2587
bd1722d4 2588 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2589 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2590 xprt->addrlen = args->addrlen;
d3bc9a1d 2591 if (args->srcaddr)
fbfffbd5 2592 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2593 else {
2594 int err;
2595 err = xs_init_anyaddr(args->dstaddr->sa_family,
2596 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2597 if (err != 0) {
2598 xprt_free(xprt);
92476850 2599 return ERR_PTR(err);
2aa13531 2600 }
92476850 2601 }
c8541ecd
CL		 2602
2603 return xprt;
2604}
2605
176e21ee
CL		 2606static const struct rpc_timeout xs_local_default_timeout = {
2607 .to_initval = 10 * HZ,
2608 .to_maxval = 10 * HZ,
2609 .to_retries = 2,
2610};
2611
2612/**
2613 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2614 * @args: rpc transport creation arguments
2615 *
2616 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2617 */
2618static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2619{
2620 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2621 struct sock_xprt *transport;
2622 struct rpc_xprt *xprt;
2623 struct rpc_xprt *ret;
2624
d9ba131d
TM		 2625 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2626 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2627 if (IS_ERR(xprt))
2628 return xprt;
2629 transport = container_of(xprt, struct sock_xprt, xprt);
2630
2631 xprt->prot = 0;
2632 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2633 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2634
2635 xprt->bind_timeout = XS_BIND_TO;
2636 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2637 xprt->idle_timeout = XS_IDLE_DISC_TO;
2638
2639 xprt->ops = &xs_local_ops;
2640 xprt->timeout = &xs_local_default_timeout;
2641
2642 switch (sun->sun_family) {
2643 case AF_LOCAL:
2644 if (sun->sun_path[0] != '/') {
2645 dprintk("RPC: bad AF_LOCAL address: %s\n",
2646 sun->sun_path);
2647 ret = ERR_PTR(-EINVAL);
2648 goto out_err;
2649 }
2650 xprt_set_bound(xprt);
2651 INIT_DELAYED_WORK(&transport->connect_worker,
2652 xs_local_setup_socket);
2653 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2654 break;
2655 default:
2656 ret = ERR_PTR(-EAFNOSUPPORT);
2657 goto out_err;
2658 }
2659
2660 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2661 xprt->address_strings[RPC_DISPLAY_ADDR]);
2662
2663 if (try_module_get(THIS_MODULE))
2664 return xprt;
2665 ret = ERR_PTR(-EINVAL);
2666out_err:
2667 xprt_free(xprt);
2668 return ret;
2669}
2670
2881ae74
TM		 2671static const struct rpc_timeout xs_udp_default_timeout = {
2672 .to_initval = 5 * HZ,
2673 .to_maxval = 30 * HZ,
2674 .to_increment = 5 * HZ,
2675 .to_retries = 5,
2676};
2677
9903cd1c
CL		 2678/**
2679 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2680 * @args: rpc transport creation arguments
9903cd1c
CL		 2681 *
2682 */
483066d6 2683static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2684{
8f9d5b1a 2685 struct sockaddr *addr = args->dstaddr;
c8541ecd 2686 struct rpc_xprt *xprt;
c8475461 2687 struct sock_xprt *transport;
0a68b0be 2688 struct rpc_xprt *ret;
a246b010 2689
d9ba131d
TM		 2690 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2691 xprt_udp_slot_table_entries);
c8541ecd
CL		 2692 if (IS_ERR(xprt))
2693 return xprt;
c8475461 2694 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2695
ec739ef0 2696 xprt->prot = IPPROTO_UDP;
808012fb 2697 xprt->tsh_size = 0;
a246b010
CL		 2698 /* XXX: header size can vary due to auth type, IPv6, etc. */
2699 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2700
03bf4b70 2701 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2702 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2703 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2704
262965f5 2705 xprt->ops = &xs_udp_ops;
a246b010 2706
ba7392bb 2707 xprt->timeout = &xs_udp_default_timeout;
a246b010 2708
8f9d5b1a
CL		 2709 switch (addr->sa_family) {
2710 case AF_INET:
2711 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2712 xprt_set_bound(xprt);
2713
2714 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2715 xs_udp_setup_socket);
9dc3b095 2716 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2717 break;
2718 case AF_INET6:
2719 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2720 xprt_set_bound(xprt);
2721
2722 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2723 xs_udp_setup_socket);
9dc3b095 2724 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2725 break;
2726 default:
0a68b0be
BF		 2727 ret = ERR_PTR(-EAFNOSUPPORT);
2728 goto out_err;
8f9d5b1a
CL		 2729 }
2730
c740eff8
CL		 2731 if (xprt_bound(xprt))
2732 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2733 xprt->address_strings[RPC_DISPLAY_ADDR],
2734 xprt->address_strings[RPC_DISPLAY_PORT],
2735 xprt->address_strings[RPC_DISPLAY_PROTO]);
2736 else
2737 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2738 xprt->address_strings[RPC_DISPLAY_ADDR],
2739 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2740
bc25571e
TT		 2741 if (try_module_get(THIS_MODULE))
2742 return xprt;
0a68b0be
BF		 2743 ret = ERR_PTR(-EINVAL);
2744out_err:
e204e621 2745 xprt_free(xprt);
0a68b0be 2746 return ret;
a246b010
CL		 2747}
2748
2881ae74
TM		 2749static const struct rpc_timeout xs_tcp_default_timeout = {
2750 .to_initval = 60 * HZ,
2751 .to_maxval = 60 * HZ,
2752 .to_retries = 2,
2753};
2754
9903cd1c
CL		 2755/**
2756 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2757 * @args: rpc transport creation arguments
9903cd1c
CL		 2758 *
2759 */
483066d6 2760static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2761{
8f9d5b1a 2762 struct sockaddr *addr = args->dstaddr;
c8541ecd 2763 struct rpc_xprt *xprt;
c8475461 2764 struct sock_xprt *transport;
0a68b0be 2765 struct rpc_xprt *ret;
a246b010 2766
d9ba131d
TM		 2767 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2768 xprt_max_tcp_slot_table_entries);
c8541ecd
CL		 2769 if (IS_ERR(xprt))
2770 return xprt;
c8475461 2771 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2772
ec739ef0 2773 xprt->prot = IPPROTO_TCP;
808012fb 2774 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2775 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2776
03bf4b70 2777 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2778 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2779 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2780
262965f5 2781 xprt->ops = &xs_tcp_ops;
ba7392bb 2782 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2783
8f9d5b1a
CL		 2784 switch (addr->sa_family) {
2785 case AF_INET:
2786 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2787 xprt_set_bound(xprt);
2788
9dc3b095 2789 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2790 xs_tcp_setup_socket);
9dc3b095 2791 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2792 break;
2793 case AF_INET6:
2794 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2795 xprt_set_bound(xprt);
2796
9dc3b095 2797 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2798 xs_tcp_setup_socket);
9dc3b095 2799 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2800 break;
2801 default:
0a68b0be
BF		 2802 ret = ERR_PTR(-EAFNOSUPPORT);
2803 goto out_err;
8f9d5b1a
CL		 2804 }
2805
c740eff8
CL		 2806 if (xprt_bound(xprt))
2807 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2808 xprt->address_strings[RPC_DISPLAY_ADDR],
2809 xprt->address_strings[RPC_DISPLAY_PORT],
2810 xprt->address_strings[RPC_DISPLAY_PROTO]);
2811 else
2812 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2813 xprt->address_strings[RPC_DISPLAY_ADDR],
2814 xprt->address_strings[RPC_DISPLAY_PROTO]);
2815
edb267a6 2816
bc25571e
TT		 2817 if (try_module_get(THIS_MODULE))
2818 return xprt;
0a68b0be
BF		 2819 ret = ERR_PTR(-EINVAL);
2820out_err:
e204e621 2821 xprt_free(xprt);
0a68b0be 2822 return ret;
a246b010 2823}
282b32e1 2824
f300baba
AB		 2825/**
2826 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2827 * @args: rpc transport creation arguments
2828 *
2829 */
2830static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2831{
2832 struct sockaddr *addr = args->dstaddr;
2833 struct rpc_xprt *xprt;
2834 struct sock_xprt *transport;
2835 struct svc_sock *bc_sock;
0a68b0be 2836 struct rpc_xprt *ret;
f300baba 2837
f0418aa4
BF		 2838 if (args->bc_xprt->xpt_bc_xprt) {
2839 /*
2840 * This server connection already has a backchannel
2841 * export; we can't create a new one, as we wouldn't be
2842 * able to match replies based on xid any more. So,
2843 * reuse the already-existing one:
2844 */
2845 return args->bc_xprt->xpt_bc_xprt;
2846 }
d9ba131d
TM		 2847 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2848 xprt_tcp_slot_table_entries);
f300baba
AB		 2849 if (IS_ERR(xprt))
2850 return xprt;
2851 transport = container_of(xprt, struct sock_xprt, xprt);
2852
2853 xprt->prot = IPPROTO_TCP;
2854 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2855 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2856 xprt->timeout = &xs_tcp_default_timeout;
2857
2858 /* backchannel */
2859 xprt_set_bound(xprt);
2860 xprt->bind_timeout = 0;
f300baba
AB		 2861 xprt->reestablish_timeout = 0;
2862 xprt->idle_timeout = 0;
2863
f300baba
AB		 2864 xprt->ops = &bc_tcp_ops;
2865
2866 switch (addr->sa_family) {
2867 case AF_INET:
2868 xs_format_peer_addresses(xprt, "tcp",
2869 RPCBIND_NETID_TCP);
2870 break;
2871 case AF_INET6:
2872 xs_format_peer_addresses(xprt, "tcp",
2873 RPCBIND_NETID_TCP6);
2874 break;
2875 default:
0a68b0be
BF		 2876 ret = ERR_PTR(-EAFNOSUPPORT);
2877 goto out_err;
f300baba
AB		 2878 }
2879
50fa0d40
PE		 2880 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2881 xprt->address_strings[RPC_DISPLAY_ADDR],
2882 xprt->address_strings[RPC_DISPLAY_PORT],
2883 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2884
99de8ea9
BF		 2885 /*
2886 * Once we've associated a backchannel xprt with a connection,
2887 * we want to keep it around as long as long as the connection
2888 * lasts, in case we need to start using it for a backchannel
2889 * again; this reference won't be dropped until bc_xprt is
2890 * destroyed.
2891 */
2892 xprt_get(xprt);
2893 args->bc_xprt->xpt_bc_xprt = xprt;
2894 xprt->bc_xprt = args->bc_xprt;
2895 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2896 transport->sock = bc_sock->sk_sock;
2897 transport->inet = bc_sock->sk_sk;
2898
f300baba
AB		 2899 /*
2900 * Since we don't want connections for the backchannel, we set
2901 * the xprt status to connected
2902 */
2903 xprt_set_connected(xprt);
2904
2905
2906 if (try_module_get(THIS_MODULE))
2907 return xprt;
99de8ea9 2908 xprt_put(xprt);
0a68b0be
BF		 2909 ret = ERR_PTR(-EINVAL);
2910out_err:
e204e621 2911 xprt_free(xprt);
0a68b0be 2912 return ret;
f300baba
AB		 2913}
2914
176e21ee
CL		 2915static struct xprt_class xs_local_transport = {
2916 .list = LIST_HEAD_INIT(xs_local_transport.list),
2917 .name = "named UNIX socket",
2918 .owner = THIS_MODULE,
2919 .ident = XPRT_TRANSPORT_LOCAL,
2920 .setup = xs_setup_local,
2921};
2922
bc25571e
TT		 2923static struct xprt_class xs_udp_transport = {
2924 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2925 .name = "udp",
2926 .owner = THIS_MODULE,
f300baba 2927 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2928 .setup = xs_setup_udp,
2929};
2930
2931static struct xprt_class xs_tcp_transport = {
2932 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2933 .name = "tcp",
2934 .owner = THIS_MODULE,
f300baba 2935 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2936 .setup = xs_setup_tcp,
2937};
2938
f300baba
AB		 2939static struct xprt_class xs_bc_tcp_transport = {
2940 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2941 .name = "tcp NFSv4.1 backchannel",
2942 .owner = THIS_MODULE,
2943 .ident = XPRT_TRANSPORT_BC_TCP,
2944 .setup = xs_setup_bc_tcp,
2945};
2946
282b32e1 2947/**
bc25571e 2948 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2949 *
2950 */
2951int init_socket_xprt(void)
2952{
fbf76683 2953#ifdef RPC_DEBUG
2b1bec5f 2954 if (!sunrpc_table_header)
0b4d4147 2955 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2956#endif
2957
176e21ee 2958 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2959 xprt_register_transport(&xs_udp_transport);
2960 xprt_register_transport(&xs_tcp_transport);
f300baba 2961 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2962
282b32e1
CL		 2963 return 0;
2964}
2965
2966/**
bc25571e 2967 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2968 *
2969 */
2970void cleanup_socket_xprt(void)
2971{
fbf76683
CL		 2972#ifdef RPC_DEBUG
2973 if (sunrpc_table_header) {
2974 unregister_sysctl_table(sunrpc_table_header);
2975 sunrpc_table_header = NULL;
2976 }
2977#endif
bc25571e 2978
176e21ee 2979 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2980 xprt_unregister_transport(&xs_udp_transport);
2981 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2982 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2983}
cbf11071 2984
9bbb9e5a
RR		 2985static int param_set_uint_minmax(const char *val,
2986 const struct kernel_param *kp,
cbf11071
TM		 2987 unsigned int min, unsigned int max)
2988{
2989 unsigned long num;
2990 int ret;
2991
2992 if (!val)
2993 return -EINVAL;
2994 ret = strict_strtoul(val, 0, &num);
2995 if (ret == -EINVAL || num < min || num > max)
2996 return -EINVAL;
2997 *((unsigned int *)kp->arg) = num;
2998 return 0;
2999}
3000
9bbb9e5a 3001static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 3002{
3003 return param_set_uint_minmax(val, kp,
3004 RPC_MIN_RESVPORT,
3005 RPC_MAX_RESVPORT);
3006}
3007
9bbb9e5a
RR		 3008static struct kernel_param_ops param_ops_portnr = {
3009 .set = param_set_portnr,
3010 .get = param_get_uint,
3011};
3012
cbf11071
TM		 3013#define param_check_portnr(name, p) \
3014 __param_check(name, p, unsigned int);
3015
3016module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3017module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3018
9bbb9e5a
RR		 3019static int param_set_slot_table_size(const char *val,
3020 const struct kernel_param *kp)
cbf11071
TM		 3021{
3022 return param_set_uint_minmax(val, kp,
3023 RPC_MIN_SLOT_TABLE,
3024 RPC_MAX_SLOT_TABLE);
3025}
3026
9bbb9e5a
RR		 3027static struct kernel_param_ops param_ops_slot_table_size = {
3028 .set = param_set_slot_table_size,
3029 .get = param_get_uint,
3030};
3031
cbf11071
TM		 3032#define param_check_slot_table_size(name, p) \
3033 __param_check(name, p, unsigned int);
3034
d9ba131d
TM		 3035static int param_set_max_slot_table_size(const char *val,
3036 const struct kernel_param *kp)
3037{
3038 return param_set_uint_minmax(val, kp,
3039 RPC_MIN_SLOT_TABLE,
3040 RPC_MAX_SLOT_TABLE_LIMIT);
3041}
3042
3043static struct kernel_param_ops param_ops_max_slot_table_size = {
3044 .set = param_set_max_slot_table_size,
3045 .get = param_get_uint,
3046};
3047
3048#define param_check_max_slot_table_size(name, p) \
3049 __param_check(name, p, unsigned int);
3050
cbf11071
TM		 3051module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3052 slot_table_size, 0644);
d9ba131d
TM		 3053module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3054 max_slot_table_size, 0644);
cbf11071
TM		 3055module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3056 slot_table_size, 0644);
3057
Linux 6.x block layer and io_uring tree(s)