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Merge branch 'upload/fix' of git://github.com/hzhuang1/linux into fixes
[deliverable/linux.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
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 *);
ffc2e518
CL		 257};
258
e136d092
CL		 259/*
260 * TCP receive state flags
261 */
262#define TCP_RCV_LAST_FRAG (1UL << 0)
263#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
264#define TCP_RCV_COPY_XID (1UL << 2)
265#define TCP_RCV_COPY_DATA (1UL << 3)
f4a2e418
RL		 266#define TCP_RCV_READ_CALLDIR (1UL << 4)
267#define TCP_RCV_COPY_CALLDIR (1UL << 5)
18dca02a
RL		 268
269/*
270 * TCP RPC flags
271 */
f4a2e418 272#define TCP_RPC_REPLY (1UL << 6)
e136d092 273
95392c59
CL		 274static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
275{
276 return (struct sockaddr *) &xprt->addr;
277}
278
176e21ee
CL		 279static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
280{
281 return (struct sockaddr_un *) &xprt->addr;
282}
283
95392c59 284static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 285{
95392c59
CL		 286 return (struct sockaddr_in *) &xprt->addr;
287}
288
289static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
290{
291 return (struct sockaddr_in6 *) &xprt->addr;
292}
293
c877b849 294static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 295{
c877b849 296 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 297 struct sockaddr_in6 *sin6;
298 struct sockaddr_in *sin;
176e21ee 299 struct sockaddr_un *sun;
c877b849 300 char buf[128];
edb267a6 301
9dc3b095 302 switch (sap->sa_family) {
176e21ee
CL		 303 case AF_LOCAL:
304 sun = xs_addr_un(xprt);
305 strlcpy(buf, sun->sun_path, sizeof(buf));
306 xprt->address_strings[RPC_DISPLAY_ADDR] =
307 kstrdup(buf, GFP_KERNEL);
308 break;
9dc3b095 309 case AF_INET:
176e21ee
CL		 310 (void)rpc_ntop(sap, buf, sizeof(buf));
311 xprt->address_strings[RPC_DISPLAY_ADDR] =
312 kstrdup(buf, GFP_KERNEL);
9dc3b095 313 sin = xs_addr_in(xprt);
fc0b5791 314 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 315 break;
316 case AF_INET6:
176e21ee
CL		 317 (void)rpc_ntop(sap, buf, sizeof(buf));
318 xprt->address_strings[RPC_DISPLAY_ADDR] =
319 kstrdup(buf, GFP_KERNEL);
9dc3b095 320 sin6 = xs_addr_in6(xprt);
fc0b5791 321 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 322 break;
323 default:
324 BUG();
756805e7 325 }
176e21ee 326
9dc3b095 327 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 328}
329
9dc3b095 330static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 331{
9dc3b095
CL		 332 struct sockaddr *sap = xs_addr(xprt);
333 char buf[128];
4b6473fb 334
81160e66 335 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 336 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 337
81160e66 338 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 339 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
340}
4b6473fb 341
9dc3b095
CL		 342static void xs_format_peer_addresses(struct rpc_xprt *xprt,
343 const char *protocol,
344 const char *netid)
c877b849 345{
b454ae90 346 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 347 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 348 xs_format_common_peer_addresses(xprt);
9dc3b095 349 xs_format_common_peer_ports(xprt);
edb267a6 350}
4b6473fb 351
9dc3b095 352static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 353{
9dc3b095
CL		 354 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
355 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 356
9dc3b095 357 xs_format_common_peer_ports(xprt);
edb267a6
CL		 358}
359
360static void xs_free_peer_addresses(struct rpc_xprt *xprt)
361{
33e01dc7
CL		 362 unsigned int i;
363
364 for (i = 0; i < RPC_DISPLAY_MAX; i++)
365 switch (i) {
366 case RPC_DISPLAY_PROTO:
367 case RPC_DISPLAY_NETID:
368 continue;
369 default:
370 kfree(xprt->address_strings[i]);
371 }
edb267a6
CL		 372}
373
b4b5cc85
CL		 374#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
375
24c5684b 376static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 377{
b4b5cc85
CL		 378 struct msghdr msg = {
379 .msg_name = addr,
380 .msg_namelen = addrlen,
24c5684b
TM		 381 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
382 };
383 struct kvec iov = {
384 .iov_base = vec->iov_base + base,
385 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 386 };
387
24c5684b 388 if (iov.iov_len != 0)
b4b5cc85
CL		 389 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
390 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
391}
392
24c5684b 393static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
b4b5cc85 394{
24c5684b
TM		 395 struct page **ppage;
396 unsigned int remainder;
397 int err, sent = 0;
398
399 remainder = xdr->page_len - base;
400 base += xdr->page_base;
401 ppage = xdr->pages + (base >> PAGE_SHIFT);
402 base &= ~PAGE_MASK;
403 for(;;) {
404 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
405 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 406
24c5684b
TM		 407 remainder -= len;
408 if (remainder != 0 || more)
409 flags |= MSG_MORE;
410 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
411 if (remainder == 0 || err != len)
412 break;
413 sent += err;
414 ppage++;
415 base = 0;
416 }
417 if (sent == 0)
418 return err;
419 if (err > 0)
420 sent += err;
421 return sent;
b4b5cc85
CL		 422}
423
9903cd1c
CL		 424/**
425 * xs_sendpages - write pages directly to a socket
426 * @sock: socket to send on
427 * @addr: UDP only -- address of destination
428 * @addrlen: UDP only -- length of destination address
429 * @xdr: buffer containing this request
430 * @base: starting position in the buffer
431 *
a246b010 432 */
24c5684b 433static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
a246b010 434{
24c5684b
TM		 435 unsigned int remainder = xdr->len - base;
436 int err, sent = 0;
a246b010 437
262965f5 438 if (unlikely(!sock))
fba91afb 439 return -ENOTSOCK;
262965f5
CL		 440
441 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 442 if (base != 0) {
443 addr = NULL;
444 addrlen = 0;
445 }
262965f5 446
24c5684b
TM		 447 if (base < xdr->head[0].iov_len || addr != NULL) {
448 unsigned int len = xdr->head[0].iov_len - base;
449 remainder -= len;
450 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
451 if (remainder == 0 || err != len)
a246b010 452 goto out;
24c5684b 453 sent += err;
a246b010
CL		 454 base = 0;
455 } else
24c5684b 456 base -= xdr->head[0].iov_len;
a246b010 457
24c5684b
TM		 458 if (base < xdr->page_len) {
459 unsigned int len = xdr->page_len - base;
460 remainder -= len;
461 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
462 if (remainder == 0 || err != len)
a246b010 463 goto out;
24c5684b 464 sent += err;
a246b010 465 base = 0;
24c5684b
TM		 466 } else
467 base -= xdr->page_len;
468
469 if (base >= xdr->tail[0].iov_len)
470 return sent;
471 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 472out:
24c5684b
TM		 473 if (sent == 0)
474 return err;
475 if (err > 0)
476 sent += err;
477 return sent;
a246b010
CL		 478}
479
b6ddf64f
TM		 480static void xs_nospace_callback(struct rpc_task *task)
481{
482 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
483
484 transport->inet->sk_write_pending--;
485 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
486}
487
9903cd1c 488/**
262965f5
CL		 489 * xs_nospace - place task on wait queue if transmit was incomplete
490 * @task: task to put to sleep
9903cd1c 491 *
a246b010 492 */
5e3771ce 493static int xs_nospace(struct rpc_task *task)
a246b010 494{
262965f5
CL		 495 struct rpc_rqst *req = task->tk_rqstp;
496 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 497 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
24ca9a84 498 int ret = -EAGAIN;
a246b010 499
46121cf7 500 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 501 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
502 req->rq_slen);
503
b6ddf64f
TM		 504 /* Protect against races with write_space */
505 spin_lock_bh(&xprt->transport_lock);
506
507 /* Don't race with disconnect */
508 if (xprt_connected(xprt)) {
509 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
510 /*
511 * Notify TCP that we're limited by the application
512 * window size
513 */
514 set_bit(SOCK_NOSPACE, &transport->sock->flags);
515 transport->inet->sk_write_pending++;
516 /* ...and wait for more buffer space */
517 xprt_wait_for_buffer_space(task, xs_nospace_callback);
518 }
519 } else {
520 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 521 ret = -ENOTCONN;
b6ddf64f 522 }
262965f5 523
b6ddf64f 524 spin_unlock_bh(&xprt->transport_lock);
5e3771ce 525 return ret;
262965f5
CL		 526}
527
61677eee
CL		 528/*
529 * Construct a stream transport record marker in @buf.
530 */
531static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
532{
533 u32 reclen = buf->len - sizeof(rpc_fraghdr);
534 rpc_fraghdr *base = buf->head[0].iov_base;
535 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
536}
537
176e21ee
CL		 538/**
539 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
540 * @task: RPC task that manages the state of an RPC request
541 *
542 * Return values:
543 * 0: The request has been sent
544 * EAGAIN: The socket was blocked, please call again later to
545 * complete the request
546 * ENOTCONN: Caller needs to invoke connect logic then call again
547 * other: Some other error occured, the request was not sent
548 */
549static int xs_local_send_request(struct rpc_task *task)
550{
551 struct rpc_rqst *req = task->tk_rqstp;
552 struct rpc_xprt *xprt = req->rq_xprt;
553 struct sock_xprt *transport =
554 container_of(xprt, struct sock_xprt, xprt);
555 struct xdr_buf *xdr = &req->rq_snd_buf;
556 int status;
557
558 xs_encode_stream_record_marker(&req->rq_snd_buf);
559
560 xs_pktdump("packet data:",
561 req->rq_svec->iov_base, req->rq_svec->iov_len);
562
563 status = xs_sendpages(transport->sock, NULL, 0,
564 xdr, req->rq_bytes_sent);
565 dprintk("RPC: %s(%u) = %d\n",
566 __func__, xdr->len - req->rq_bytes_sent, status);
567 if (likely(status >= 0)) {
568 req->rq_bytes_sent += status;
569 req->rq_xmit_bytes_sent += status;
570 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
571 req->rq_bytes_sent = 0;
572 return 0;
573 }
574 status = -EAGAIN;
575 }
576
577 switch (status) {
578 case -EAGAIN:
579 status = xs_nospace(task);
580 break;
581 default:
582 dprintk("RPC: sendmsg returned unrecognized error %d\n",
583 -status);
584 case -EPIPE:
585 xs_close(xprt);
586 status = -ENOTCONN;
587 }
588
589 return status;
590}
591
262965f5
CL		 592/**
593 * xs_udp_send_request - write an RPC request to a UDP socket
594 * @task: address of RPC task that manages the state of an RPC request
595 *
596 * Return values:
597 * 0: The request has been sent
598 * EAGAIN: The socket was blocked, please call again later to
599 * complete the request
600 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 601 * other: Some other error occurred, the request was not sent
262965f5
CL		 602 */
603static int xs_udp_send_request(struct rpc_task *task)
604{
605 struct rpc_rqst *req = task->tk_rqstp;
606 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5
CL		 608 struct xdr_buf *xdr = &req->rq_snd_buf;
609 int status;
a246b010 610
9903cd1c 611 xs_pktdump("packet data:",
a246b010
CL		 612 req->rq_svec->iov_base,
613 req->rq_svec->iov_len);
614
01d37c42
TM		 615 if (!xprt_bound(xprt))
616 return -ENOTCONN;
ee0ac0c2 617 status = xs_sendpages(transport->sock,
95392c59 618 xs_addr(xprt),
ee0ac0c2
CL		 619 xprt->addrlen, xdr,
620 req->rq_bytes_sent);
a246b010 621
46121cf7 622 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 623 xdr->len - req->rq_bytes_sent, status);
a246b010 624
2199700f 625 if (status >= 0) {
d60dbb20 626 req->rq_xmit_bytes_sent += status;
2199700f
TM		 627 if (status >= req->rq_slen)
628 return 0;
629 /* Still some bytes left; set up for a retry later. */
262965f5 630 status = -EAGAIN;
2199700f 631 }
a246b010 632
262965f5 633 switch (status) {
fba91afb
TM		 634 case -ENOTSOCK:
635 status = -ENOTCONN;
636 /* Should we call xs_close() here? */
637 break;
b6ddf64f 638 case -EAGAIN:
5e3771ce 639 status = xs_nospace(task);
b6ddf64f 640 break;
c8485e4d
TM		 641 default:
642 dprintk("RPC: sendmsg returned unrecognized error %d\n",
643 -status);
262965f5
CL		 644 case -ENETUNREACH:
645 case -EPIPE:
a246b010
CL		 646 case -ECONNREFUSED:
647 /* When the server has died, an ICMP port unreachable message
9903cd1c 648 * prompts ECONNREFUSED. */
b6ddf64f 649 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 650 }
5fe46e9d 651
262965f5 652 return status;
a246b010
CL		 653}
654
e06799f9
TM		 655/**
656 * xs_tcp_shutdown - gracefully shut down a TCP socket
657 * @xprt: transport
658 *
659 * Initiates a graceful shutdown of the TCP socket by calling the
660 * equivalent of shutdown(SHUT_WR);
661 */
662static void xs_tcp_shutdown(struct rpc_xprt *xprt)
663{
664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
665 struct socket *sock = transport->sock;
666
667 if (sock != NULL)
668 kernel_sock_shutdown(sock, SHUT_WR);
669}
670
9903cd1c 671/**
262965f5 672 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 673 * @task: address of RPC task that manages the state of an RPC request
674 *
675 * Return values:
262965f5
CL		 676 * 0: The request has been sent
677 * EAGAIN: The socket was blocked, please call again later to
678 * complete the request
679 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 680 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 681 *
682 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 683 * if sendmsg is not able to make progress?
9903cd1c 684 */
262965f5 685static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 686{
687 struct rpc_rqst *req = task->tk_rqstp;
688 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 689 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 690 struct xdr_buf *xdr = &req->rq_snd_buf;
b595bb15 691 int status;
a246b010 692
61677eee 693 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 694
262965f5
CL		 695 xs_pktdump("packet data:",
696 req->rq_svec->iov_base,
697 req->rq_svec->iov_len);
a246b010
CL		 698
699 /* Continue transmitting the packet/record. We must be careful
700 * to cope with writespace callbacks arriving _after_ we have
262965f5 701 * called sendmsg(). */
a246b010 702 while (1) {
ee0ac0c2
CL		 703 status = xs_sendpages(transport->sock,
704 NULL, 0, xdr, req->rq_bytes_sent);
a246b010 705
46121cf7 706 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 707 xdr->len - req->rq_bytes_sent, status);
a246b010 708
262965f5 709 if (unlikely(status < 0))
a246b010 710 break;
a246b010 711
262965f5
CL		 712 /* If we've sent the entire packet, immediately
713 * reset the count of bytes sent. */
714 req->rq_bytes_sent += status;
d60dbb20 715 req->rq_xmit_bytes_sent += status;
262965f5
CL		 716 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
717 req->rq_bytes_sent = 0;
718 return 0;
719 }
a246b010 720
06b4b681
TM		 721 if (status != 0)
722 continue;
a246b010 723 status = -EAGAIN;
06b4b681 724 break;
a246b010
CL		 725 }
726
262965f5 727 switch (status) {
fba91afb
TM		 728 case -ENOTSOCK:
729 status = -ENOTCONN;
730 /* Should we call xs_close() here? */
731 break;
262965f5 732 case -EAGAIN:
5e3771ce 733 status = xs_nospace(task);
262965f5 734 break;
c8485e4d
TM		 735 default:
736 dprintk("RPC: sendmsg returned unrecognized error %d\n",
737 -status);
262965f5 738 case -ECONNRESET:
2a9e1cfa
TM		 739 xs_tcp_shutdown(xprt);
740 case -ECONNREFUSED:
262965f5 741 case -ENOTCONN:
b9d2bb2e 742 case -EPIPE:
b6ddf64f 743 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 744 }
5fe46e9d 745
a246b010
CL		 746 return status;
747}
748
e0ab53de
TM		 749/**
750 * xs_tcp_release_xprt - clean up after a tcp transmission
751 * @xprt: transport
752 * @task: rpc task
753 *
754 * This cleans up if an error causes us to abort the transmission of a request.
755 * In this case, the socket may need to be reset in order to avoid confusing
756 * the server.
757 */
758static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
759{
760 struct rpc_rqst *req;
761
762 if (task != xprt->snd_task)
763 return;
764 if (task == NULL)
765 goto out_release;
766 req = task->tk_rqstp;
43cedbf0
TM		 767 if (req == NULL)
768 goto out_release;
e0ab53de
TM		 769 if (req->rq_bytes_sent == 0)
770 goto out_release;
771 if (req->rq_bytes_sent == req->rq_snd_buf.len)
772 goto out_release;
773 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
774out_release:
775 xprt_release_xprt(xprt, task);
776}
777
2a9e1cfa
TM		 778static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
779{
780 transport->old_data_ready = sk->sk_data_ready;
781 transport->old_state_change = sk->sk_state_change;
782 transport->old_write_space = sk->sk_write_space;
2a9e1cfa
TM		 783}
784
785static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
786{
787 sk->sk_data_ready = transport->old_data_ready;
788 sk->sk_state_change = transport->old_state_change;
789 sk->sk_write_space = transport->old_write_space;
2a9e1cfa
TM		 790}
791
fe315e76 792static void xs_reset_transport(struct sock_xprt *transport)
a246b010 793{
ee0ac0c2
CL		 794 struct socket *sock = transport->sock;
795 struct sock *sk = transport->inet;
a246b010 796
fe315e76
CL		 797 if (sk == NULL)
798 return;
9903cd1c 799
246408dc
TM		 800 transport->srcport = 0;
801
a246b010 802 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 803 transport->inet = NULL;
804 transport->sock = NULL;
a246b010 805
9903cd1c 806 sk->sk_user_data = NULL;
2a9e1cfa
TM		 807
808 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 809 write_unlock_bh(&sk->sk_callback_lock);
810
9903cd1c 811 sk->sk_no_check = 0;
a246b010
CL		 812
813 sock_release(sock);
fe315e76
CL		 814}
815
816/**
817 * xs_close - close a socket
818 * @xprt: transport
819 *
820 * This is used when all requests are complete; ie, no DRC state remains
821 * on the server we want to save.
f75e6745
TM		 822 *
823 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
824 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 825 */
826static void xs_close(struct rpc_xprt *xprt)
827{
828 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
829
830 dprintk("RPC: xs_close xprt %p\n", xprt);
831
832 xs_reset_transport(transport);
61d0a8e6 833 xprt->reestablish_timeout = 0;
fe315e76 834
632e3bdc 835 smp_mb__before_clear_bit();
7d1e8255 836 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 837 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 838 clear_bit(XPRT_CLOSING, &xprt->state);
632e3bdc 839 smp_mb__after_clear_bit();
62da3b24 840 xprt_disconnect_done(xprt);
a246b010
CL		 841}
842
f75e6745
TM		 843static void xs_tcp_close(struct rpc_xprt *xprt)
844{
845 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
846 xs_close(xprt);
847 else
848 xs_tcp_shutdown(xprt);
849}
850
9903cd1c
CL		 851/**
852 * xs_destroy - prepare to shutdown a transport
853 * @xprt: doomed transport
854 *
855 */
856static void xs_destroy(struct rpc_xprt *xprt)
a246b010 857{
c8475461
CL		 858 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
859
46121cf7 860 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 861
afe2c511 862 cancel_delayed_work_sync(&transport->connect_worker);
a246b010 863
9903cd1c 864 xs_close(xprt);
edb267a6 865 xs_free_peer_addresses(xprt);
e204e621 866 xprt_free(xprt);
bc25571e 867 module_put(THIS_MODULE);
a246b010
CL		 868}
869
9903cd1c
CL		 870static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
871{
872 return (struct rpc_xprt *) sk->sk_user_data;
873}
874
176e21ee
CL		 875static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
876{
877 struct xdr_skb_reader desc = {
878 .skb = skb,
879 .offset = sizeof(rpc_fraghdr),
880 .count = skb->len - sizeof(rpc_fraghdr),
881 };
882
883 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
884 return -1;
885 if (desc.count)
886 return -1;
887 return 0;
888}
889
890/**
891 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
892 * @sk: socket with data to read
893 * @len: how much data to read
894 *
895 * Currently this assumes we can read the whole reply in a single gulp.
896 */
897static void xs_local_data_ready(struct sock *sk, int len)
898{
899 struct rpc_task *task;
900 struct rpc_xprt *xprt;
901 struct rpc_rqst *rovr;
902 struct sk_buff *skb;
903 int err, repsize, copied;
904 u32 _xid;
905 __be32 *xp;
906
907 read_lock_bh(&sk->sk_callback_lock);
908 dprintk("RPC: %s...\n", __func__);
909 xprt = xprt_from_sock(sk);
910 if (xprt == NULL)
911 goto out;
912
913 skb = skb_recv_datagram(sk, 0, 1, &err);
914 if (skb == NULL)
915 goto out;
916
176e21ee
CL		 917 repsize = skb->len - sizeof(rpc_fraghdr);
918 if (repsize < 4) {
919 dprintk("RPC: impossible RPC reply size %d\n", repsize);
920 goto dropit;
921 }
922
923 /* Copy the XID from the skb... */
924 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
925 if (xp == NULL)
926 goto dropit;
927
928 /* Look up and lock the request corresponding to the given XID */
929 spin_lock(&xprt->transport_lock);
930 rovr = xprt_lookup_rqst(xprt, *xp);
931 if (!rovr)
932 goto out_unlock;
933 task = rovr->rq_task;
934
935 copied = rovr->rq_private_buf.buflen;
936 if (copied > repsize)
937 copied = repsize;
938
939 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
940 dprintk("RPC: sk_buff copy failed\n");
941 goto out_unlock;
942 }
943
944 xprt_complete_rqst(task, copied);
945
946 out_unlock:
947 spin_unlock(&xprt->transport_lock);
948 dropit:
949 skb_free_datagram(sk, skb);
950 out:
951 read_unlock_bh(&sk->sk_callback_lock);
952}
953
9903cd1c
CL		 954/**
955 * xs_udp_data_ready - "data ready" callback for UDP sockets
956 * @sk: socket with data to read
957 * @len: how much data to read
958 *
a246b010 959 */
9903cd1c 960static void xs_udp_data_ready(struct sock *sk, int len)
a246b010 961{
9903cd1c
CL		 962 struct rpc_task *task;
963 struct rpc_xprt *xprt;
a246b010 964 struct rpc_rqst *rovr;
9903cd1c 965 struct sk_buff *skb;
a246b010 966 int err, repsize, copied;
d8ed029d
AD		 967 u32 _xid;
968 __be32 *xp;
a246b010 969
f064af1e 970 read_lock_bh(&sk->sk_callback_lock);
46121cf7 971 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 972 if (!(xprt = xprt_from_sock(sk)))
a246b010 973 goto out;
a246b010
CL		 974
975 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
976 goto out;
977
a246b010
CL		 978 repsize = skb->len - sizeof(struct udphdr);
979 if (repsize < 4) {
46121cf7 980 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 981 goto dropit;
982 }
983
984 /* Copy the XID from the skb... */
985 xp = skb_header_pointer(skb, sizeof(struct udphdr),
986 sizeof(_xid), &_xid);
987 if (xp == NULL)
988 goto dropit;
989
990 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 991 spin_lock(&xprt->transport_lock);
a246b010
CL		 992 rovr = xprt_lookup_rqst(xprt, *xp);
993 if (!rovr)
994 goto out_unlock;
995 task = rovr->rq_task;
996
a246b010
CL		 997 if ((copied = rovr->rq_private_buf.buflen) > repsize)
998 copied = repsize;
999
1000 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1001 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1002 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1003 goto out_unlock;
1781f7f5
HX		 1004 }
1005
1006 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1007
1570c1e4 1008 xprt_adjust_cwnd(task, copied);
1570c1e4 1009 xprt_complete_rqst(task, copied);
a246b010
CL		 1010
1011 out_unlock:
4a0f8c04 1012 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1013 dropit:
1014 skb_free_datagram(sk, skb);
1015 out:
f064af1e 1016 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1017}
1018
a519fc7a
TM		 1019/*
1020 * Helper function to force a TCP close if the server is sending
1021 * junk and/or it has put us in CLOSE_WAIT
1022 */
1023static void xs_tcp_force_close(struct rpc_xprt *xprt)
1024{
1025 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1026 xprt_force_disconnect(xprt);
1027}
1028
dd456471 1029static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1030{
51971139 1031 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1032 size_t len, used;
1033 char *p;
1034
51971139
CL		 1035 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1036 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1037 used = xdr_skb_read_bits(desc, p, len);
51971139 1038 transport->tcp_offset += used;
a246b010
CL		 1039 if (used != len)
1040 return;
808012fb 1041
51971139
CL		 1042 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1043 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1044 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1045 else
e136d092 1046 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1047 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1048
e136d092 1049 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1050 transport->tcp_offset = 0;
808012fb 1051
a246b010 1052 /* Sanity check of the record length */
18dca02a 1053 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1054 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1055 xs_tcp_force_close(xprt);
9903cd1c 1056 return;
a246b010 1057 }
46121cf7 1058 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1059 transport->tcp_reclen);
a246b010
CL		 1060}
1061
51971139 1062static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1063{
51971139 1064 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1065 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1066 transport->tcp_offset = 0;
e136d092
CL		 1067 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1068 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1069 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1070 transport->tcp_copied = 0;
a246b010
CL		 1071 }
1072 }
1073}
1074
dd456471 1075static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1076{
1077 size_t len, used;
1078 char *p;
1079
51971139 1080 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1081 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1082 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1083 used = xdr_skb_read_bits(desc, p, len);
51971139 1084 transport->tcp_offset += used;
a246b010
CL		 1085 if (used != len)
1086 return;
e136d092 1087 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1088 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1089 transport->tcp_copied = 4;
18dca02a
RL		 1090 dprintk("RPC: reading %s XID %08x\n",
1091 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1092 : "request with",
51971139
CL		 1093 ntohl(transport->tcp_xid));
1094 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1095}
1096
18dca02a
RL		 1097static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1098 struct xdr_skb_reader *desc)
a246b010 1099{
18dca02a
RL		 1100 size_t len, used;
1101 u32 offset;
b76ce561 1102 char *p;
18dca02a
RL		 1103
1104 /*
1105 * We want transport->tcp_offset to be 8 at the end of this routine
1106 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1107 * When this function is called for the first time,
1108 * transport->tcp_offset is 4 (after having already read the xid).
1109 */
1110 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1111 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1112 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1113 p = ((char *) &transport->tcp_calldir) + offset;
1114 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1115 transport->tcp_offset += used;
1116 if (used != len)
1117 return;
f4a2e418 1118 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1119 /*
1120 * We don't yet have the XDR buffer, so we will write the calldir
1121 * out after we get the buffer from the 'struct rpc_rqst'
1122 */
b76ce561
TM		 1123 switch (ntohl(transport->tcp_calldir)) {
1124 case RPC_REPLY:
1125 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1126 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1127 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1128 break;
1129 case RPC_CALL:
1130 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1131 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1132 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1133 break;
1134 default:
1135 dprintk("RPC: invalid request message type\n");
a519fc7a 1136 xs_tcp_force_close(&transport->xprt);
b76ce561 1137 }
18dca02a
RL		 1138 xs_tcp_check_fraghdr(transport);
1139}
1140
44b98efd
RL		 1141static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1142 struct xdr_skb_reader *desc,
1143 struct rpc_rqst *req)
a246b010 1144{
44b98efd
RL		 1145 struct sock_xprt *transport =
1146 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1147 struct xdr_buf *rcvbuf;
1148 size_t len;
1149 ssize_t r;
1150
a246b010 1151 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1152
1153 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1154 /*
1155 * Save the RPC direction in the XDR buffer
1156 */
f4a2e418 1157 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1158 &transport->tcp_calldir,
1159 sizeof(transport->tcp_calldir));
1160 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1161 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1162 }
1163
a246b010 1164 len = desc->count;
51971139 1165 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1166 struct xdr_skb_reader my_desc;
a246b010 1167
51971139 1168 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1169 memcpy(&my_desc, desc, sizeof(my_desc));
1170 my_desc.count = len;
51971139 1171 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1172 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1173 desc->count -= r;
1174 desc->offset += r;
1175 } else
51971139 1176 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1177 desc, xdr_skb_read_bits);
a246b010
CL		 1178
1179 if (r > 0) {
51971139
CL		 1180 transport->tcp_copied += r;
1181 transport->tcp_offset += r;
a246b010
CL		 1182 }
1183 if (r != len) {
1184 /* Error when copying to the receive buffer,
1185 * usually because we weren't able to allocate
1186 * additional buffer pages. All we can do now
e136d092 1187 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1188 * will not receive any additional updates,
1189 * and time out.
1190 * Any remaining data from this record will
1191 * be discarded.
1192 */
e136d092 1193 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1194 dprintk("RPC: XID %08x truncated request\n",
51971139 1195 ntohl(transport->tcp_xid));
46121cf7
CL		 1196 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1197 "tcp_offset = %u, tcp_reclen = %u\n",
1198 xprt, transport->tcp_copied,
1199 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1200 return;
a246b010
CL		 1201 }
1202
46121cf7 1203 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1204 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1205 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1206 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1207 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1208
1209 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1210 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1211 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1212 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1214 }
44b98efd
RL		 1215}
1216
1217/*
1218 * Finds the request corresponding to the RPC xid and invokes the common
1219 * tcp read code to read the data.
1220 */
1221static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1222 struct xdr_skb_reader *desc)
1223{
1224 struct sock_xprt *transport =
1225 container_of(xprt, struct sock_xprt, xprt);
1226 struct rpc_rqst *req;
1227
1228 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1229
1230 /* Find and lock the request corresponding to this xid */
1231 spin_lock(&xprt->transport_lock);
1232 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1233 if (!req) {
1234 dprintk("RPC: XID %08x request not found!\n",
1235 ntohl(transport->tcp_xid));
1236 spin_unlock(&xprt->transport_lock);
1237 return -1;
1238 }
1239
1240 xs_tcp_read_common(xprt, desc, req);
1241
e136d092 1242 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1243 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1244
4a0f8c04 1245 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1246 return 0;
1247}
1248
9e00abc3 1249#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1250/*
1251 * Obtains an rpc_rqst previously allocated and invokes the common
1252 * tcp read code to read the data. The result is placed in the callback
1253 * queue.
1254 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1255 * connection and return -1.
1256 */
1257static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1258 struct xdr_skb_reader *desc)
1259{
1260 struct sock_xprt *transport =
1261 container_of(xprt, struct sock_xprt, xprt);
1262 struct rpc_rqst *req;
1263
1264 req = xprt_alloc_bc_request(xprt);
1265 if (req == NULL) {
1266 printk(KERN_WARNING "Callback slot table overflowed\n");
1267 xprt_force_disconnect(xprt);
1268 return -1;
1269 }
1270
1271 req->rq_xid = transport->tcp_xid;
1272 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1273 xs_tcp_read_common(xprt, desc, req);
1274
1275 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1276 struct svc_serv *bc_serv = xprt->bc_serv;
1277
1278 /*
1279 * Add callback request to callback list. The callback
1280 * service sleeps on the sv_cb_waitq waiting for new
1281 * requests. Wake it up after adding enqueing the
1282 * request.
1283 */
1284 dprintk("RPC: add callback request to list\n");
1285 spin_lock(&bc_serv->sv_cb_lock);
1286 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1287 spin_unlock(&bc_serv->sv_cb_lock);
1288 wake_up(&bc_serv->sv_cb_waitq);
1289 }
1290
1291 req->rq_private_buf.len = transport->tcp_copied;
1292
1293 return 0;
1294}
1295
1296static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1297 struct xdr_skb_reader *desc)
1298{
1299 struct sock_xprt *transport =
1300 container_of(xprt, struct sock_xprt, xprt);
1301
1302 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1303 xs_tcp_read_reply(xprt, desc) :
1304 xs_tcp_read_callback(xprt, desc);
1305}
1306#else
1307static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1308 struct xdr_skb_reader *desc)
1309{
1310 return xs_tcp_read_reply(xprt, desc);
1311}
9e00abc3 1312#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1313
1314/*
1315 * Read data off the transport. This can be either an RPC_CALL or an
1316 * RPC_REPLY. Relay the processing to helper functions.
1317 */
1318static void xs_tcp_read_data(struct rpc_xprt *xprt,
1319 struct xdr_skb_reader *desc)
1320{
1321 struct sock_xprt *transport =
1322 container_of(xprt, struct sock_xprt, xprt);
1323
1324 if (_xs_tcp_read_data(xprt, desc) == 0)
1325 xs_tcp_check_fraghdr(transport);
1326 else {
1327 /*
1328 * The transport_lock protects the request handling.
1329 * There's no need to hold it to update the tcp_flags.
1330 */
1331 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1332 }
a246b010
CL		 1333}
1334
dd456471 1335static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1336{
1337 size_t len;
1338
51971139 1339 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1340 if (len > desc->count)
1341 len = desc->count;
1342 desc->count -= len;
1343 desc->offset += len;
51971139 1344 transport->tcp_offset += len;
46121cf7 1345 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1346 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1347}
1348
9903cd1c 1349static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1350{
1351 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1352 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1353 struct xdr_skb_reader desc = {
a246b010
CL		 1354 .skb = skb,
1355 .offset = offset,
1356 .count = len,
9903cd1c 1357 };
a246b010 1358
46121cf7 1359 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1360 do {
1361 /* Read in a new fragment marker if necessary */
1362 /* Can we ever really expect to get completely empty fragments? */
e136d092 1363 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1364 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1365 continue;
1366 }
1367 /* Read in the xid if necessary */
e136d092 1368 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1369 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1370 continue;
1371 }
18dca02a 1372 /* Read in the call/reply flag */
f4a2e418 1373 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1374 xs_tcp_read_calldir(transport, &desc);
1375 continue;
1376 }
a246b010 1377 /* Read in the request data */
e136d092 1378 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1379 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1380 continue;
1381 }
1382 /* Skip over any trailing bytes on short reads */
51971139 1383 xs_tcp_read_discard(transport, &desc);
a246b010 1384 } while (desc.count);
46121cf7 1385 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1386 return len - desc.count;
1387}
1388
9903cd1c
CL		 1389/**
1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1391 * @sk: socket with data to read
1392 * @bytes: how much data to read
1393 *
1394 */
1395static void xs_tcp_data_ready(struct sock *sk, int bytes)
a246b010
CL		 1396{
1397 struct rpc_xprt *xprt;
1398 read_descriptor_t rd_desc;
ff2d7db8 1399 int read;
a246b010 1400
46121cf7
CL		 1401 dprintk("RPC: xs_tcp_data_ready...\n");
1402
f064af1e 1403 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1404 if (!(xprt = xprt_from_sock(sk)))
a246b010 1405 goto out;
61d0a8e6
NB		 1406 /* Any data means we had a useful conversation, so
1407 * the we don't need to delay the next reconnect
1408 */
1409 if (xprt->reestablish_timeout)
1410 xprt->reestablish_timeout = 0;
1411
9903cd1c 1412 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1413 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1414 do {
1415 rd_desc.count = 65536;
1416 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1417 } while (read > 0);
a246b010 1418out:
f064af1e 1419 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1420}
1421
7d1e8255
TM		 1422/*
1423 * Do the equivalent of linger/linger2 handling for dealing with
1424 * broken servers that don't close the socket in a timely
1425 * fashion
1426 */
1427static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1428 unsigned long timeout)
1429{
1430 struct sock_xprt *transport;
1431
1432 if (xprt_test_and_set_connecting(xprt))
1433 return;
1434 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1435 transport = container_of(xprt, struct sock_xprt, xprt);
1436 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1437 timeout);
1438}
1439
1440static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1441{
1442 struct sock_xprt *transport;
1443
1444 transport = container_of(xprt, struct sock_xprt, xprt);
1445
1446 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1447 !cancel_delayed_work(&transport->connect_worker))
1448 return;
1449 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1450 xprt_clear_connecting(xprt);
1451}
1452
4bc1e68e 1453static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
7d1e8255
TM		 1454{
1455 smp_mb__before_clear_bit();
a519fc7a
TM		 1456 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1457 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1459 clear_bit(XPRT_CLOSING, &xprt->state);
1460 smp_mb__after_clear_bit();
4bc1e68e
TM		 1461}
1462
1463static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1464{
1465 xs_sock_reset_connection_flags(xprt);
7d1e8255
TM		 1466 /* Mark transport as closed and wake up all pending tasks */
1467 xprt_disconnect_done(xprt);
1468}
1469
9903cd1c
CL		 1470/**
1471 * xs_tcp_state_change - callback to handle TCP socket state changes
1472 * @sk: socket whose state has changed
1473 *
1474 */
1475static void xs_tcp_state_change(struct sock *sk)
a246b010 1476{
9903cd1c 1477 struct rpc_xprt *xprt;
a246b010 1478
f064af1e 1479 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1480 if (!(xprt = xprt_from_sock(sk)))
1481 goto out;
46121cf7 1482 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1483 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1484 sk->sk_state, xprt_connected(xprt),
1485 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1486 sock_flag(sk, SOCK_ZAPPED),
1487 sk->sk_shutdown);
a246b010
CL		 1488
1489 switch (sk->sk_state) {
1490 case TCP_ESTABLISHED:
f064af1e 1491 spin_lock(&xprt->transport_lock);
a246b010 1492 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1493 struct sock_xprt *transport = container_of(xprt,
1494 struct sock_xprt, xprt);
1495
a246b010 1496 /* Reset TCP record info */
51971139
CL		 1497 transport->tcp_offset = 0;
1498 transport->tcp_reclen = 0;
1499 transport->tcp_copied = 0;
e136d092
CL		 1500 transport->tcp_flags =
1501 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
51971139 1502
2a491991 1503 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1504 }
f064af1e 1505 spin_unlock(&xprt->transport_lock);
a246b010 1506 break;
3b948ae5
TM		 1507 case TCP_FIN_WAIT1:
1508 /* The client initiated a shutdown of the socket */
7c1d71cf 1509 xprt->connect_cookie++;
663b8858 1510 xprt->reestablish_timeout = 0;
3b948ae5
TM		 1511 set_bit(XPRT_CLOSING, &xprt->state);
1512 smp_mb__before_clear_bit();
1513 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1514 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 1515 smp_mb__after_clear_bit();
25fe6142 1516 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1517 break;
632e3bdc 1518 case TCP_CLOSE_WAIT:
3b948ae5 1519 /* The server initiated a shutdown of the socket */
7c1d71cf 1520 xprt->connect_cookie++;
d0bea455 1521 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1522 xs_tcp_force_close(xprt);
663b8858
TM		 1523 case TCP_CLOSING:
1524 /*
1525 * If the server closed down the connection, make sure that
1526 * we back off before reconnecting
1527 */
1528 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1529 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1530 break;
1531 case TCP_LAST_ACK:
670f9457 1532 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1533 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1534 smp_mb__before_clear_bit();
1535 clear_bit(XPRT_CONNECTED, &xprt->state);
1536 smp_mb__after_clear_bit();
1537 break;
1538 case TCP_CLOSE:
7d1e8255
TM		 1539 xs_tcp_cancel_linger_timeout(xprt);
1540 xs_sock_mark_closed(xprt);
a246b010
CL		 1541 }
1542 out:
f064af1e 1543 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1544}
1545
1f0fa154
IJ		 1546static void xs_write_space(struct sock *sk)
1547{
1548 struct socket *sock;
1549 struct rpc_xprt *xprt;
1550
1551 if (unlikely(!(sock = sk->sk_socket)))
1552 return;
1553 clear_bit(SOCK_NOSPACE, &sock->flags);
1554
1555 if (unlikely(!(xprt = xprt_from_sock(sk))))
1556 return;
1557 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1558 return;
1559
1560 xprt_write_space(xprt);
1561}
1562
9903cd1c 1563/**
c7b2cae8
CL		 1564 * xs_udp_write_space - callback invoked when socket buffer space
1565 * becomes available
9903cd1c
CL		 1566 * @sk: socket whose state has changed
1567 *
a246b010
CL		 1568 * Called when more output buffer space is available for this socket.
1569 * We try not to wake our writers until they can make "significant"
c7b2cae8 1570 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1571 * with a bunch of small requests.
1572 */
c7b2cae8 1573static void xs_udp_write_space(struct sock *sk)
a246b010 1574{
f064af1e 1575 read_lock_bh(&sk->sk_callback_lock);
a246b010 1576
c7b2cae8 1577 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1578 if (sock_writeable(sk))
1579 xs_write_space(sk);
a246b010 1580
f064af1e 1581 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1582}
a246b010 1583
c7b2cae8
CL		 1584/**
1585 * xs_tcp_write_space - callback invoked when socket buffer space
1586 * becomes available
1587 * @sk: socket whose state has changed
1588 *
1589 * Called when more output buffer space is available for this socket.
1590 * We try not to wake our writers until they can make "significant"
1591 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1592 * with a bunch of small requests.
1593 */
1594static void xs_tcp_write_space(struct sock *sk)
1595{
f064af1e 1596 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1597
1598 /* from net/core/stream.c:sk_stream_write_space */
1f0fa154
IJ		 1599 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1600 xs_write_space(sk);
b6ddf64f 1601
f064af1e 1602 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1603}
1604
470056c2 1605static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1606{
ee0ac0c2
CL		 1607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1608 struct sock *sk = transport->inet;
a246b010 1609
7c6e066e 1610 if (transport->rcvsize) {
a246b010 1611 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1612 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1613 }
7c6e066e 1614 if (transport->sndsize) {
a246b010 1615 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1616 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1617 sk->sk_write_space(sk);
1618 }
1619}
1620
43118c29 1621/**
470056c2 1622 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1623 * @xprt: generic transport
470056c2
CL		 1624 * @sndsize: requested size of send buffer, in bytes
1625 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1626 *
470056c2 1627 * Set socket send and receive buffer size limits.
43118c29 1628 */
470056c2 1629static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1630{
7c6e066e
CL		 1631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1632
1633 transport->sndsize = 0;
470056c2 1634 if (sndsize)
7c6e066e
CL		 1635 transport->sndsize = sndsize + 1024;
1636 transport->rcvsize = 0;
470056c2 1637 if (rcvsize)
7c6e066e 1638 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1639
1640 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1641}
1642
46c0ee8b
CL		 1643/**
1644 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1645 * @task: task that timed out
1646 *
1647 * Adjust the congestion window after a retransmit timeout has occurred.
1648 */
1649static void xs_udp_timer(struct rpc_task *task)
1650{
1651 xprt_adjust_cwnd(task, -ETIMEDOUT);
1652}
1653
b85d8806
CL		 1654static unsigned short xs_get_random_port(void)
1655{
1656 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1657 unsigned short rand = (unsigned short) net_random() % range;
1658 return rand + xprt_min_resvport;
1659}
1660
92200412
CL		 1661/**
1662 * xs_set_port - reset the port number in the remote endpoint address
1663 * @xprt: generic transport
1664 * @port: new port number
1665 *
1666 */
1667static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1668{
46121cf7 1669 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1670
9dc3b095
CL		 1671 rpc_set_port(xs_addr(xprt), port);
1672 xs_update_peer_port(xprt);
92200412
CL		 1673}
1674
5d4ec932 1675static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1676{
fbfffbd5 1677 unsigned short port = transport->srcport;
67a391d7
TM		 1678
1679 if (port == 0 && transport->xprt.resvport)
1680 port = xs_get_random_port();
1681 return port;
1682}
1683
baaf4e48 1684static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1685{
fbfffbd5
CL		 1686 if (transport->srcport != 0)
1687 transport->srcport = 0;
67a391d7
TM		 1688 if (!transport->xprt.resvport)
1689 return 0;
1690 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1691 return xprt_max_resvport;
1692 return --port;
1693}
beb59b68 1694static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1695{
beb59b68 1696 struct sockaddr_storage myaddr;
67a391d7 1697 int err, nloop = 0;
5d4ec932 1698 unsigned short port = xs_get_srcport(transport);
67a391d7 1699 unsigned short last;
a246b010 1700
beb59b68 1701 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1702 do {
beb59b68
PE		 1703 rpc_set_port((struct sockaddr *)&myaddr, port);
1704 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1705 transport->xprt.addrlen);
67a391d7 1706 if (port == 0)
d3bc9a1d 1707 break;
a246b010 1708 if (err == 0) {
fbfffbd5 1709 transport->srcport = port;
d3bc9a1d 1710 break;
a246b010 1711 }
67a391d7 1712 last = port;
baaf4e48 1713 port = xs_next_srcport(transport, port);
67a391d7
TM		 1714 if (port > last)
1715 nloop++;
1716 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1717
4232e863 1718 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1719 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1720 &((struct sockaddr_in *)&myaddr)->sin_addr,
1721 port, err ? "failed" : "ok", err);
1722 else
1723 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1724 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1725 port, err ? "failed" : "ok", err);
a246b010
CL		 1726 return err;
1727}
1728
176e21ee
CL		 1729/*
1730 * We don't support autobind on AF_LOCAL sockets
1731 */
1732static void xs_local_rpcbind(struct rpc_task *task)
1733{
1734 xprt_set_bound(task->tk_xprt);
1735}
1736
1737static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1738{
1739}
beb59b68 1740
ed07536e
PZ		 1741#ifdef CONFIG_DEBUG_LOCK_ALLOC
1742static struct lock_class_key xs_key[2];
1743static struct lock_class_key xs_slock_key[2];
1744
176e21ee
CL		 1745static inline void xs_reclassify_socketu(struct socket *sock)
1746{
1747 struct sock *sk = sock->sk;
1748
1749 BUG_ON(sock_owned_by_user(sk));
1750 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1751 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1752}
1753
8945ee5e 1754static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1755{
1756 struct sock *sk = sock->sk;
8945ee5e 1757
02b3d346 1758 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1759 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1760 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1761}
ed07536e 1762
8945ee5e
CL		 1763static inline void xs_reclassify_socket6(struct socket *sock)
1764{
1765 struct sock *sk = sock->sk;
ed07536e 1766
f4921aff 1767 BUG_ON(sock_owned_by_user(sk));
8945ee5e
CL		 1768 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1769 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1770}
6bc9638a
PE		 1771
1772static inline void xs_reclassify_socket(int family, struct socket *sock)
1773{
4232e863 1774 switch (family) {
176e21ee
CL		 1775 case AF_LOCAL:
1776 xs_reclassify_socketu(sock);
1777 break;
4232e863 1778 case AF_INET:
6bc9638a 1779 xs_reclassify_socket4(sock);
4232e863
CL		 1780 break;
1781 case AF_INET6:
6bc9638a 1782 xs_reclassify_socket6(sock);
4232e863
CL		 1783 break;
1784 }
6bc9638a 1785}
ed07536e 1786#else
176e21ee
CL		 1787static inline void xs_reclassify_socketu(struct socket *sock)
1788{
1789}
1790
8945ee5e
CL		 1791static inline void xs_reclassify_socket4(struct socket *sock)
1792{
1793}
1794
1795static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1796{
1797}
6bc9638a
PE		 1798
1799static inline void xs_reclassify_socket(int family, struct socket *sock)
1800{
1801}
ed07536e
PZ		 1802#endif
1803
6bc9638a
PE		 1804static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1805 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1806{
1807 struct socket *sock;
1808 int err;
1809
6bc9638a 1810 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1811 if (err < 0) {
1812 dprintk("RPC: can't create %d transport socket (%d).\n",
1813 protocol, -err);
1814 goto out;
1815 }
6bc9638a 1816 xs_reclassify_socket(family, sock);
22f79326 1817
4cea288a
BH		 1818 err = xs_bind(transport, sock);
1819 if (err) {
22f79326
PE		 1820 sock_release(sock);
1821 goto out;
1822 }
1823
1824 return sock;
1825out:
1826 return ERR_PTR(err);
1827}
1828
176e21ee
CL		 1829static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1830 struct socket *sock)
1831{
1832 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1833 xprt);
1834
1835 if (!transport->inet) {
1836 struct sock *sk = sock->sk;
1837
1838 write_lock_bh(&sk->sk_callback_lock);
1839
1840 xs_save_old_callbacks(transport, sk);
1841
1842 sk->sk_user_data = xprt;
1843 sk->sk_data_ready = xs_local_data_ready;
1844 sk->sk_write_space = xs_udp_write_space;
176e21ee
CL		 1845 sk->sk_allocation = GFP_ATOMIC;
1846
1847 xprt_clear_connected(xprt);
1848
1849 /* Reset to new socket */
1850 transport->sock = sock;
1851 transport->inet = sk;
1852
1853 write_unlock_bh(&sk->sk_callback_lock);
1854 }
1855
1856 /* Tell the socket layer to start connecting... */
1857 xprt->stat.connect_count++;
1858 xprt->stat.connect_start = jiffies;
1859 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1860}
1861
1862/**
1863 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1864 * @xprt: RPC transport to connect
1865 * @transport: socket transport to connect
1866 * @create_sock: function to create a socket of the correct type
1867 *
1868 * Invoked by a work queue tasklet.
1869 */
1870static void xs_local_setup_socket(struct work_struct *work)
1871{
1872 struct sock_xprt *transport =
1873 container_of(work, struct sock_xprt, connect_worker.work);
1874 struct rpc_xprt *xprt = &transport->xprt;
1875 struct socket *sock;
1876 int status = -EIO;
1877
5cf02d09
JL		 1878 current->flags |= PF_FSTRANS;
1879
176e21ee
CL		 1880 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1881 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1882 SOCK_STREAM, 0, &sock, 1);
1883 if (status < 0) {
1884 dprintk("RPC: can't create AF_LOCAL "
1885 "transport socket (%d).\n", -status);
1886 goto out;
1887 }
1888 xs_reclassify_socketu(sock);
1889
1890 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1891 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1892
1893 status = xs_local_finish_connecting(xprt, sock);
1894 switch (status) {
1895 case 0:
1896 dprintk("RPC: xprt %p connected to %s\n",
1897 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1898 xprt_set_connected(xprt);
1899 break;
1900 case -ENOENT:
1901 dprintk("RPC: xprt %p: socket %s does not exist\n",
1902 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1903 break;
1904 default:
1905 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1906 __func__, -status,
1907 xprt->address_strings[RPC_DISPLAY_ADDR]);
1908 }
1909
1910out:
1911 xprt_clear_connecting(xprt);
1912 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1913 current->flags &= ~PF_FSTRANS;
176e21ee
CL		 1914}
1915
a564b8f0
MG		 1916#ifdef CONFIG_SUNRPC_SWAP
1917static void xs_set_memalloc(struct rpc_xprt *xprt)
1918{
1919 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1920 xprt);
1921
1922 if (xprt->swapper)
1923 sk_set_memalloc(transport->inet);
1924}
1925
1926/**
1927 * xs_swapper - Tag this transport as being used for swap.
1928 * @xprt: transport to tag
1929 * @enable: enable/disable
1930 *
1931 */
1932int xs_swapper(struct rpc_xprt *xprt, int enable)
1933{
1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1935 xprt);
1936 int err = 0;
1937
1938 if (enable) {
1939 xprt->swapper++;
1940 xs_set_memalloc(xprt);
1941 } else if (xprt->swapper) {
1942 xprt->swapper--;
1943 sk_clear_memalloc(transport->inet);
1944 }
1945
1946 return err;
1947}
1948EXPORT_SYMBOL_GPL(xs_swapper);
1949#else
1950static void xs_set_memalloc(struct rpc_xprt *xprt)
1951{
1952}
1953#endif
1954
16be2d20
CL		 1955static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1956{
1957 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1958
1959 if (!transport->inet) {
1960 struct sock *sk = sock->sk;
1961
1962 write_lock_bh(&sk->sk_callback_lock);
1963
2a9e1cfa
TM		 1964 xs_save_old_callbacks(transport, sk);
1965
16be2d20 1966 sk->sk_user_data = xprt;
16be2d20
CL		 1967 sk->sk_data_ready = xs_udp_data_ready;
1968 sk->sk_write_space = xs_udp_write_space;
1969 sk->sk_no_check = UDP_CSUM_NORCV;
1970 sk->sk_allocation = GFP_ATOMIC;
1971
1972 xprt_set_connected(xprt);
1973
1974 /* Reset to new socket */
1975 transport->sock = sock;
1976 transport->inet = sk;
1977
a564b8f0
MG		 1978 xs_set_memalloc(xprt);
1979
16be2d20
CL		 1980 write_unlock_bh(&sk->sk_callback_lock);
1981 }
1982 xs_udp_do_set_buffer_size(xprt);
1983}
1984
8c14ff2a 1985static void xs_udp_setup_socket(struct work_struct *work)
a246b010 1986{
34161db6
TM		 1987 struct sock_xprt *transport =
1988 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 1989 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 1990 struct socket *sock = transport->sock;
b65c0310 1991 int status = -EIO;
9903cd1c 1992
5cf02d09
JL		 1993 current->flags |= PF_FSTRANS;
1994
b0d93ad5 1995 /* Start by resetting any existing state */
fe315e76 1996 xs_reset_transport(transport);
8c14ff2a
PE		 1997 sock = xs_create_sock(xprt, transport,
1998 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 1999 if (IS_ERR(sock))
b0d93ad5 2000 goto out;
68e220bd 2001
c740eff8
CL		 2002 dprintk("RPC: worker connecting xprt %p via %s to "
2003 "%s (port %s)\n", xprt,
2004 xprt->address_strings[RPC_DISPLAY_PROTO],
2005 xprt->address_strings[RPC_DISPLAY_ADDR],
2006 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2007
2008 xs_udp_finish_connecting(xprt, sock);
b0d93ad5
CL		 2009 status = 0;
2010out:
b0d93ad5 2011 xprt_clear_connecting(xprt);
7d1e8255 2012 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2013 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2014}
2015
3167e12c
CL		 2016/*
2017 * We need to preserve the port number so the reply cache on the server can
2018 * find our cached RPC replies when we get around to reconnecting.
2019 */
58dddac9 2020static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2021{
2022 int result;
3167e12c
CL		 2023 struct sockaddr any;
2024
58dddac9 2025 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2026
2027 /*
2028 * Disconnect the transport socket by doing a connect operation
2029 * with AF_UNSPEC. This should return immediately...
2030 */
2031 memset(&any, 0, sizeof(any));
2032 any.sa_family = AF_UNSPEC;
ee0ac0c2 2033 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
7d1e8255 2034 if (!result)
4bc1e68e
TM		 2035 xs_sock_reset_connection_flags(&transport->xprt);
2036 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
3167e12c
CL		 2037}
2038
58dddac9 2039static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2040{
2041 unsigned int state = transport->inet->sk_state;
2042
669502ff
AC		 2043 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2044 /* we don't need to abort the connection if the socket
2045 * hasn't undergone a shutdown
2046 */
2047 if (transport->inet->sk_shutdown == 0)
2048 return;
2049 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2050 __func__, transport->inet->sk_shutdown);
2051 }
2052 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2053 /* we don't need to abort the connection if the socket
2054 * hasn't undergone a shutdown
2055 */
2056 if (transport->inet->sk_shutdown == 0)
2057 return;
2058 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2059 "sk_shutdown set to %d\n",
2060 __func__, transport->inet->sk_shutdown);
2061 }
58dddac9 2062 xs_abort_connection(transport);
40d2549d
TM		 2063}
2064
16be2d20 2065static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2066{
16be2d20 2067 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2068 int ret = -ENOTCONN;
edb267a6 2069
ee0ac0c2 2070 if (!transport->inet) {
b0d93ad5
CL		 2071 struct sock *sk = sock->sk;
2072
2073 write_lock_bh(&sk->sk_callback_lock);
2074
2a9e1cfa
TM		 2075 xs_save_old_callbacks(transport, sk);
2076
b0d93ad5 2077 sk->sk_user_data = xprt;
b0d93ad5
CL		 2078 sk->sk_data_ready = xs_tcp_data_ready;
2079 sk->sk_state_change = xs_tcp_state_change;
2080 sk->sk_write_space = xs_tcp_write_space;
b079fa7b 2081 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2082
2083 /* socket options */
2084 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2085 sock_reset_flag(sk, SOCK_LINGER);
2086 tcp_sk(sk)->linger2 = 0;
2087 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2088
2089 xprt_clear_connected(xprt);
2090
2091 /* Reset to new socket */
ee0ac0c2
CL		 2092 transport->sock = sock;
2093 transport->inet = sk;
b0d93ad5
CL		 2094
2095 write_unlock_bh(&sk->sk_callback_lock);
2096 }
2097
01d37c42 2098 if (!xprt_bound(xprt))
fe19a96b 2099 goto out;
01d37c42 2100
a564b8f0
MG		 2101 xs_set_memalloc(xprt);
2102
b0d93ad5 2103 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2104 xprt->stat.connect_count++;
2105 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2106 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2107 switch (ret) {
2108 case 0:
2109 case -EINPROGRESS:
2110 /* SYN_SENT! */
2111 xprt->connect_cookie++;
2112 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2113 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2114 }
2115out:
2116 return ret;
16be2d20
CL		 2117}
2118
9903cd1c 2119/**
b61d59ff
TM		 2120 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2121 * @xprt: RPC transport to connect
2122 * @transport: socket transport to connect
2123 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2124 *
2125 * Invoked by a work queue tasklet.
a246b010 2126 */
cdd518d5 2127static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2128{
cdd518d5
PE		 2129 struct sock_xprt *transport =
2130 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2131 struct socket *sock = transport->sock;
a9f5f0f7 2132 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2133 int status = -EIO;
a246b010 2134
5cf02d09
JL		 2135 current->flags |= PF_FSTRANS;
2136
ee0ac0c2 2137 if (!sock) {
7d1e8255 2138 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2139 sock = xs_create_sock(xprt, transport,
2140 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2141 if (IS_ERR(sock)) {
2142 status = PTR_ERR(sock);
3167e12c
CL		 2143 goto out;
2144 }
7d1e8255
TM		 2145 } else {
2146 int abort_and_exit;
a246b010 2147
7d1e8255
TM		 2148 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2149 &xprt->state);
3167e12c 2150 /* "close" the socket, preserving the local port */
58dddac9 2151 xs_tcp_reuse_connection(transport);
a246b010 2152
7d1e8255
TM		 2153 if (abort_and_exit)
2154 goto out_eagain;
2155 }
a246b010 2156
c740eff8
CL		 2157 dprintk("RPC: worker connecting xprt %p via %s to "
2158 "%s (port %s)\n", xprt,
2159 xprt->address_strings[RPC_DISPLAY_PROTO],
2160 xprt->address_strings[RPC_DISPLAY_ADDR],
2161 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2162
16be2d20 2163 status = xs_tcp_finish_connecting(xprt, sock);
46121cf7
CL		 2164 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2165 xprt, -status, xprt_connected(xprt),
2166 sock->sk->sk_state);
2a491991 2167 switch (status) {
f75e6745
TM		 2168 default:
2169 printk("%s: connect returned unhandled error %d\n",
2170 __func__, status);
2171 case -EADDRNOTAVAIL:
2172 /* We're probably in TIME_WAIT. Get rid of existing socket,
2173 * and retry
2174 */
a519fc7a 2175 xs_tcp_force_close(xprt);
88b5ed73 2176 break;
8a2cec29
TM		 2177 case -ECONNREFUSED:
2178 case -ECONNRESET:
2179 case -ENETUNREACH:
2180 /* retry with existing socket, after a delay */
2a491991
TM		 2181 case 0:
2182 case -EINPROGRESS:
2183 case -EALREADY:
7d1e8255 2184 xprt_clear_connecting(xprt);
5cf02d09 2185 current->flags &= ~PF_FSTRANS;
7d1e8255 2186 return;
9fcfe0c8
TM		 2187 case -EINVAL:
2188 /* Happens, for instance, if the user specified a link
2189 * local IPv6 address without a scope-id.
2190 */
2191 goto out;
a246b010 2192 }
7d1e8255 2193out_eagain:
2a491991 2194 status = -EAGAIN;
a246b010 2195out:
68e220bd 2196 xprt_clear_connecting(xprt);
7d1e8255 2197 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2198 current->flags &= ~PF_FSTRANS;
68e220bd 2199}
b0d93ad5 2200
9903cd1c
CL		 2201/**
2202 * xs_connect - connect a socket to a remote endpoint
2203 * @task: address of RPC task that manages state of connect request
2204 *
2205 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2206 *
2207 * UDP socket connects are synchronous, but we use a work queue anyway
2208 * to guarantee that even unprivileged user processes can set up a
2209 * socket on a privileged port.
2210 *
2211 * If a UDP socket connect fails, the delay behavior here prevents
2212 * retry floods (hard mounts).
9903cd1c
CL		 2213 */
2214static void xs_connect(struct rpc_task *task)
a246b010
CL		 2215{
2216 struct rpc_xprt *xprt = task->tk_xprt;
ee0ac0c2 2217 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2218
09a21c41 2219 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2220 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2221 "seconds\n",
03bf4b70 2222 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2223 queue_delayed_work(rpciod_workqueue,
2224 &transport->connect_worker,
2225 xprt->reestablish_timeout);
03bf4b70 2226 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2227 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2228 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2229 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2230 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2231 } else {
46121cf7 2232 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2233 queue_delayed_work(rpciod_workqueue,
2234 &transport->connect_worker, 0);
a246b010
CL		 2235 }
2236}
2237
176e21ee
CL		 2238/**
2239 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2240 * @xprt: rpc_xprt struct containing statistics
2241 * @seq: output file
2242 *
2243 */
2244static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2245{
2246 long idle_time = 0;
2247
2248 if (xprt_connected(xprt))
2249 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2250
2251 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2252 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2253 xprt->stat.bind_count,
2254 xprt->stat.connect_count,
2255 xprt->stat.connect_time,
2256 idle_time,
2257 xprt->stat.sends,
2258 xprt->stat.recvs,
2259 xprt->stat.bad_xids,
2260 xprt->stat.req_u,
15a45206
AA		 2261 xprt->stat.bklog_u,
2262 xprt->stat.max_slots,
2263 xprt->stat.sending_u,
2264 xprt->stat.pending_u);
176e21ee
CL		 2265}
2266
262ca07d
CL		 2267/**
2268 * xs_udp_print_stats - display UDP socket-specifc stats
2269 * @xprt: rpc_xprt struct containing statistics
2270 * @seq: output file
2271 *
2272 */
2273static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2274{
c8475461
CL		 2275 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2276
15a45206
AA		 2277 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2278 "%lu %llu %llu\n",
fbfffbd5 2279 transport->srcport,
262ca07d
CL		 2280 xprt->stat.bind_count,
2281 xprt->stat.sends,
2282 xprt->stat.recvs,
2283 xprt->stat.bad_xids,
2284 xprt->stat.req_u,
15a45206
AA		 2285 xprt->stat.bklog_u,
2286 xprt->stat.max_slots,
2287 xprt->stat.sending_u,
2288 xprt->stat.pending_u);
262ca07d
CL		 2289}
2290
2291/**
2292 * xs_tcp_print_stats - display TCP socket-specifc stats
2293 * @xprt: rpc_xprt struct containing statistics
2294 * @seq: output file
2295 *
2296 */
2297static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2298{
c8475461 2299 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2300 long idle_time = 0;
2301
2302 if (xprt_connected(xprt))
2303 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2304
15a45206
AA		 2305 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2306 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2307 transport->srcport,
262ca07d
CL		 2308 xprt->stat.bind_count,
2309 xprt->stat.connect_count,
2310 xprt->stat.connect_time,
2311 idle_time,
2312 xprt->stat.sends,
2313 xprt->stat.recvs,
2314 xprt->stat.bad_xids,
2315 xprt->stat.req_u,
15a45206
AA		 2316 xprt->stat.bklog_u,
2317 xprt->stat.max_slots,
2318 xprt->stat.sending_u,
2319 xprt->stat.pending_u);
262ca07d
CL		 2320}
2321
4cfc7e60
RI		 2322/*
2323 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2324 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2325 * to use the server side send routines.
2326 */
5a51f13a 2327static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2328{
2329 struct page *page;
2330 struct rpc_buffer *buf;
2331
2332 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2333 page = alloc_page(GFP_KERNEL);
2334
2335 if (!page)
2336 return NULL;
2337
2338 buf = page_address(page);
2339 buf->len = PAGE_SIZE;
2340
2341 return buf->data;
2342}
2343
2344/*
2345 * Free the space allocated in the bc_alloc routine
2346 */
5a51f13a 2347static void bc_free(void *buffer)
4cfc7e60
RI		 2348{
2349 struct rpc_buffer *buf;
2350
2351 if (!buffer)
2352 return;
2353
2354 buf = container_of(buffer, struct rpc_buffer, data);
2355 free_page((unsigned long)buf);
2356}
2357
2358/*
2359 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2360 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2361 */
2362static int bc_sendto(struct rpc_rqst *req)
2363{
2364 int len;
2365 struct xdr_buf *xbufp = &req->rq_snd_buf;
2366 struct rpc_xprt *xprt = req->rq_xprt;
2367 struct sock_xprt *transport =
2368 container_of(xprt, struct sock_xprt, xprt);
2369 struct socket *sock = transport->sock;
2370 unsigned long headoff;
2371 unsigned long tailoff;
2372
61677eee 2373 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2374
2375 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2376 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2377 len = svc_send_common(sock, xbufp,
2378 virt_to_page(xbufp->head[0].iov_base), headoff,
2379 xbufp->tail[0].iov_base, tailoff);
2380
2381 if (len != xbufp->len) {
2382 printk(KERN_NOTICE "Error sending entire callback!\n");
2383 len = -EAGAIN;
2384 }
2385
2386 return len;
2387}
2388
2389/*
2390 * The send routine. Borrows from svc_send
2391 */
2392static int bc_send_request(struct rpc_task *task)
2393{
2394 struct rpc_rqst *req = task->tk_rqstp;
2395 struct svc_xprt *xprt;
2396 struct svc_sock *svsk;
2397 u32 len;
2398
2399 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2400 /*
2401 * Get the server socket associated with this callback xprt
2402 */
2403 xprt = req->rq_xprt->bc_xprt;
2404 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2405
2406 /*
2407 * Grab the mutex to serialize data as the connection is shared
2408 * with the fore channel
2409 */
2410 if (!mutex_trylock(&xprt->xpt_mutex)) {
2411 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2412 if (!mutex_trylock(&xprt->xpt_mutex))
2413 return -EAGAIN;
2414 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2415 }
2416 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2417 len = -ENOTCONN;
2418 else
2419 len = bc_sendto(req);
2420 mutex_unlock(&xprt->xpt_mutex);
2421
2422 if (len > 0)
2423 len = 0;
2424
2425 return len;
2426}
2427
2428/*
2429 * The close routine. Since this is client initiated, we do nothing
2430 */
2431
2432static void bc_close(struct rpc_xprt *xprt)
2433{
4cfc7e60
RI		 2434}
2435
2436/*
2437 * The xprt destroy routine. Again, because this connection is client
2438 * initiated, we do nothing
2439 */
2440
2441static void bc_destroy(struct rpc_xprt *xprt)
2442{
4cfc7e60
RI		 2443}
2444
176e21ee
CL		 2445static struct rpc_xprt_ops xs_local_ops = {
2446 .reserve_xprt = xprt_reserve_xprt,
2447 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2448 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2449 .rpcbind = xs_local_rpcbind,
2450 .set_port = xs_local_set_port,
2451 .connect = xs_connect,
2452 .buf_alloc = rpc_malloc,
2453 .buf_free = rpc_free,
2454 .send_request = xs_local_send_request,
2455 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2456 .close = xs_close,
2457 .destroy = xs_destroy,
2458 .print_stats = xs_local_print_stats,
2459};
2460
262965f5 2461static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2462 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2463 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2464 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2465 .alloc_slot = xprt_alloc_slot,
45160d62 2466 .rpcbind = rpcb_getport_async,
92200412 2467 .set_port = xs_set_port,
262965f5 2468 .connect = xs_connect,
02107148
CL		 2469 .buf_alloc = rpc_malloc,
2470 .buf_free = rpc_free,
262965f5 2471 .send_request = xs_udp_send_request,
fe3aca29 2472 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2473 .timer = xs_udp_timer,
a58dd398 2474 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2475 .close = xs_close,
2476 .destroy = xs_destroy,
262ca07d 2477 .print_stats = xs_udp_print_stats,
262965f5
CL		 2478};
2479
2480static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2481 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2482 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2483 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2484 .rpcbind = rpcb_getport_async,
92200412 2485 .set_port = xs_set_port,
0b9e7943 2486 .connect = xs_connect,
02107148
CL		 2487 .buf_alloc = rpc_malloc,
2488 .buf_free = rpc_free,
262965f5 2489 .send_request = xs_tcp_send_request,
fe3aca29 2490 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2491 .close = xs_tcp_close,
9903cd1c 2492 .destroy = xs_destroy,
262ca07d 2493 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2494};
2495
4cfc7e60
RI		 2496/*
2497 * The rpc_xprt_ops for the server backchannel
2498 */
2499
2500static struct rpc_xprt_ops bc_tcp_ops = {
2501 .reserve_xprt = xprt_reserve_xprt,
2502 .release_xprt = xprt_release_xprt,
84e28a30 2503 .alloc_slot = xprt_alloc_slot,
92769108 2504 .rpcbind = xs_local_rpcbind,
4cfc7e60
RI		 2505 .buf_alloc = bc_malloc,
2506 .buf_free = bc_free,
2507 .send_request = bc_send_request,
2508 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2509 .close = bc_close,
2510 .destroy = bc_destroy,
2511 .print_stats = xs_tcp_print_stats,
2512};
2513
92476850
CL		 2514static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2515{
2516 static const struct sockaddr_in sin = {
2517 .sin_family = AF_INET,
2518 .sin_addr.s_addr = htonl(INADDR_ANY),
2519 };
2520 static const struct sockaddr_in6 sin6 = {
2521 .sin6_family = AF_INET6,
2522 .sin6_addr = IN6ADDR_ANY_INIT,
2523 };
2524
2525 switch (family) {
176e21ee
CL		 2526 case AF_LOCAL:
2527 break;
92476850
CL		 2528 case AF_INET:
2529 memcpy(sap, &sin, sizeof(sin));
2530 break;
2531 case AF_INET6:
2532 memcpy(sap, &sin6, sizeof(sin6));
2533 break;
2534 default:
2535 dprintk("RPC: %s: Bad address family\n", __func__);
2536 return -EAFNOSUPPORT;
2537 }
2538 return 0;
2539}
2540
3c341b0b 2541static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2542 unsigned int slot_table_size,
2543 unsigned int max_slot_table_size)
c8541ecd
CL		 2544{
2545 struct rpc_xprt *xprt;
ffc2e518 2546 struct sock_xprt *new;
c8541ecd 2547
96802a09 2548 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2549 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2550 return ERR_PTR(-EBADF);
2551 }
2552
d9ba131d
TM		 2553 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2554 max_slot_table_size);
bd1722d4 2555 if (xprt == NULL) {
46121cf7
CL		 2556 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2557 "rpc_xprt\n");
c8541ecd
CL		 2558 return ERR_PTR(-ENOMEM);
2559 }
c8541ecd 2560
bd1722d4 2561 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2562 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2563 xprt->addrlen = args->addrlen;
d3bc9a1d 2564 if (args->srcaddr)
fbfffbd5 2565 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2566 else {
2567 int err;
2568 err = xs_init_anyaddr(args->dstaddr->sa_family,
2569 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2570 if (err != 0) {
2571 xprt_free(xprt);
92476850 2572 return ERR_PTR(err);
2aa13531 2573 }
92476850 2574 }
c8541ecd
CL		 2575
2576 return xprt;
2577}
2578
176e21ee
CL		 2579static const struct rpc_timeout xs_local_default_timeout = {
2580 .to_initval = 10 * HZ,
2581 .to_maxval = 10 * HZ,
2582 .to_retries = 2,
2583};
2584
2585/**
2586 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2587 * @args: rpc transport creation arguments
2588 *
2589 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2590 */
2591static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2592{
2593 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2594 struct sock_xprt *transport;
2595 struct rpc_xprt *xprt;
2596 struct rpc_xprt *ret;
2597
d9ba131d
TM		 2598 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2599 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2600 if (IS_ERR(xprt))
2601 return xprt;
2602 transport = container_of(xprt, struct sock_xprt, xprt);
2603
2604 xprt->prot = 0;
2605 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2606 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2607
2608 xprt->bind_timeout = XS_BIND_TO;
2609 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2610 xprt->idle_timeout = XS_IDLE_DISC_TO;
2611
2612 xprt->ops = &xs_local_ops;
2613 xprt->timeout = &xs_local_default_timeout;
2614
2615 switch (sun->sun_family) {
2616 case AF_LOCAL:
2617 if (sun->sun_path[0] != '/') {
2618 dprintk("RPC: bad AF_LOCAL address: %s\n",
2619 sun->sun_path);
2620 ret = ERR_PTR(-EINVAL);
2621 goto out_err;
2622 }
2623 xprt_set_bound(xprt);
2624 INIT_DELAYED_WORK(&transport->connect_worker,
2625 xs_local_setup_socket);
2626 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2627 break;
2628 default:
2629 ret = ERR_PTR(-EAFNOSUPPORT);
2630 goto out_err;
2631 }
2632
2633 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2634 xprt->address_strings[RPC_DISPLAY_ADDR]);
2635
2636 if (try_module_get(THIS_MODULE))
2637 return xprt;
2638 ret = ERR_PTR(-EINVAL);
2639out_err:
2640 xprt_free(xprt);
2641 return ret;
2642}
2643
2881ae74
TM		 2644static const struct rpc_timeout xs_udp_default_timeout = {
2645 .to_initval = 5 * HZ,
2646 .to_maxval = 30 * HZ,
2647 .to_increment = 5 * HZ,
2648 .to_retries = 5,
2649};
2650
9903cd1c
CL		 2651/**
2652 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2653 * @args: rpc transport creation arguments
9903cd1c
CL		 2654 *
2655 */
483066d6 2656static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2657{
8f9d5b1a 2658 struct sockaddr *addr = args->dstaddr;
c8541ecd 2659 struct rpc_xprt *xprt;
c8475461 2660 struct sock_xprt *transport;
0a68b0be 2661 struct rpc_xprt *ret;
a246b010 2662
d9ba131d
TM		 2663 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2664 xprt_udp_slot_table_entries);
c8541ecd
CL		 2665 if (IS_ERR(xprt))
2666 return xprt;
c8475461 2667 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2668
ec739ef0 2669 xprt->prot = IPPROTO_UDP;
808012fb 2670 xprt->tsh_size = 0;
a246b010
CL		 2671 /* XXX: header size can vary due to auth type, IPv6, etc. */
2672 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2673
03bf4b70 2674 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2675 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2676 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2677
262965f5 2678 xprt->ops = &xs_udp_ops;
a246b010 2679
ba7392bb 2680 xprt->timeout = &xs_udp_default_timeout;
a246b010 2681
8f9d5b1a
CL		 2682 switch (addr->sa_family) {
2683 case AF_INET:
2684 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2685 xprt_set_bound(xprt);
2686
2687 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2688 xs_udp_setup_socket);
9dc3b095 2689 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2690 break;
2691 case AF_INET6:
2692 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2693 xprt_set_bound(xprt);
2694
2695 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2696 xs_udp_setup_socket);
9dc3b095 2697 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2698 break;
2699 default:
0a68b0be
BF		 2700 ret = ERR_PTR(-EAFNOSUPPORT);
2701 goto out_err;
8f9d5b1a
CL		 2702 }
2703
c740eff8
CL		 2704 if (xprt_bound(xprt))
2705 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2706 xprt->address_strings[RPC_DISPLAY_ADDR],
2707 xprt->address_strings[RPC_DISPLAY_PORT],
2708 xprt->address_strings[RPC_DISPLAY_PROTO]);
2709 else
2710 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2711 xprt->address_strings[RPC_DISPLAY_ADDR],
2712 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2713
bc25571e
TT		 2714 if (try_module_get(THIS_MODULE))
2715 return xprt;
0a68b0be
BF		 2716 ret = ERR_PTR(-EINVAL);
2717out_err:
e204e621 2718 xprt_free(xprt);
0a68b0be 2719 return ret;
a246b010
CL		 2720}
2721
2881ae74
TM		 2722static const struct rpc_timeout xs_tcp_default_timeout = {
2723 .to_initval = 60 * HZ,
2724 .to_maxval = 60 * HZ,
2725 .to_retries = 2,
2726};
2727
9903cd1c
CL		 2728/**
2729 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2730 * @args: rpc transport creation arguments
9903cd1c
CL		 2731 *
2732 */
483066d6 2733static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2734{
8f9d5b1a 2735 struct sockaddr *addr = args->dstaddr;
c8541ecd 2736 struct rpc_xprt *xprt;
c8475461 2737 struct sock_xprt *transport;
0a68b0be 2738 struct rpc_xprt *ret;
a246b010 2739
d9ba131d
TM		 2740 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2741 xprt_max_tcp_slot_table_entries);
c8541ecd
CL		 2742 if (IS_ERR(xprt))
2743 return xprt;
c8475461 2744 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2745
ec739ef0 2746 xprt->prot = IPPROTO_TCP;
808012fb 2747 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2748 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2749
03bf4b70 2750 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2751 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2752 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2753
262965f5 2754 xprt->ops = &xs_tcp_ops;
ba7392bb 2755 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2756
8f9d5b1a
CL		 2757 switch (addr->sa_family) {
2758 case AF_INET:
2759 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2760 xprt_set_bound(xprt);
2761
9dc3b095 2762 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2763 xs_tcp_setup_socket);
9dc3b095 2764 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2765 break;
2766 case AF_INET6:
2767 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2768 xprt_set_bound(xprt);
2769
9dc3b095 2770 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2771 xs_tcp_setup_socket);
9dc3b095 2772 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2773 break;
2774 default:
0a68b0be
BF		 2775 ret = ERR_PTR(-EAFNOSUPPORT);
2776 goto out_err;
8f9d5b1a
CL		 2777 }
2778
c740eff8
CL		 2779 if (xprt_bound(xprt))
2780 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2781 xprt->address_strings[RPC_DISPLAY_ADDR],
2782 xprt->address_strings[RPC_DISPLAY_PORT],
2783 xprt->address_strings[RPC_DISPLAY_PROTO]);
2784 else
2785 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2786 xprt->address_strings[RPC_DISPLAY_ADDR],
2787 xprt->address_strings[RPC_DISPLAY_PROTO]);
2788
edb267a6 2789
bc25571e
TT		 2790 if (try_module_get(THIS_MODULE))
2791 return xprt;
0a68b0be
BF		 2792 ret = ERR_PTR(-EINVAL);
2793out_err:
e204e621 2794 xprt_free(xprt);
0a68b0be 2795 return ret;
a246b010 2796}
282b32e1 2797
f300baba
AB		 2798/**
2799 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2800 * @args: rpc transport creation arguments
2801 *
2802 */
2803static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2804{
2805 struct sockaddr *addr = args->dstaddr;
2806 struct rpc_xprt *xprt;
2807 struct sock_xprt *transport;
2808 struct svc_sock *bc_sock;
0a68b0be 2809 struct rpc_xprt *ret;
f300baba 2810
f0418aa4
BF		 2811 if (args->bc_xprt->xpt_bc_xprt) {
2812 /*
2813 * This server connection already has a backchannel
2814 * export; we can't create a new one, as we wouldn't be
2815 * able to match replies based on xid any more. So,
2816 * reuse the already-existing one:
2817 */
2818 return args->bc_xprt->xpt_bc_xprt;
2819 }
d9ba131d
TM		 2820 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2821 xprt_tcp_slot_table_entries);
f300baba
AB		 2822 if (IS_ERR(xprt))
2823 return xprt;
2824 transport = container_of(xprt, struct sock_xprt, xprt);
2825
2826 xprt->prot = IPPROTO_TCP;
2827 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2828 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2829 xprt->timeout = &xs_tcp_default_timeout;
2830
2831 /* backchannel */
2832 xprt_set_bound(xprt);
2833 xprt->bind_timeout = 0;
f300baba
AB		 2834 xprt->reestablish_timeout = 0;
2835 xprt->idle_timeout = 0;
2836
f300baba
AB		 2837 xprt->ops = &bc_tcp_ops;
2838
2839 switch (addr->sa_family) {
2840 case AF_INET:
2841 xs_format_peer_addresses(xprt, "tcp",
2842 RPCBIND_NETID_TCP);
2843 break;
2844 case AF_INET6:
2845 xs_format_peer_addresses(xprt, "tcp",
2846 RPCBIND_NETID_TCP6);
2847 break;
2848 default:
0a68b0be
BF		 2849 ret = ERR_PTR(-EAFNOSUPPORT);
2850 goto out_err;
f300baba
AB		 2851 }
2852
50fa0d40
PE		 2853 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2854 xprt->address_strings[RPC_DISPLAY_ADDR],
2855 xprt->address_strings[RPC_DISPLAY_PORT],
2856 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2857
99de8ea9
BF		 2858 /*
2859 * Once we've associated a backchannel xprt with a connection,
2860 * we want to keep it around as long as long as the connection
2861 * lasts, in case we need to start using it for a backchannel
2862 * again; this reference won't be dropped until bc_xprt is
2863 * destroyed.
2864 */
2865 xprt_get(xprt);
2866 args->bc_xprt->xpt_bc_xprt = xprt;
2867 xprt->bc_xprt = args->bc_xprt;
2868 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2869 transport->sock = bc_sock->sk_sock;
2870 transport->inet = bc_sock->sk_sk;
2871
f300baba
AB		 2872 /*
2873 * Since we don't want connections for the backchannel, we set
2874 * the xprt status to connected
2875 */
2876 xprt_set_connected(xprt);
2877
2878
2879 if (try_module_get(THIS_MODULE))
2880 return xprt;
99de8ea9 2881 xprt_put(xprt);
0a68b0be
BF		 2882 ret = ERR_PTR(-EINVAL);
2883out_err:
e204e621 2884 xprt_free(xprt);
0a68b0be 2885 return ret;
f300baba
AB		 2886}
2887
176e21ee
CL		 2888static struct xprt_class xs_local_transport = {
2889 .list = LIST_HEAD_INIT(xs_local_transport.list),
2890 .name = "named UNIX socket",
2891 .owner = THIS_MODULE,
2892 .ident = XPRT_TRANSPORT_LOCAL,
2893 .setup = xs_setup_local,
2894};
2895
bc25571e
TT		 2896static struct xprt_class xs_udp_transport = {
2897 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2898 .name = "udp",
2899 .owner = THIS_MODULE,
f300baba 2900 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2901 .setup = xs_setup_udp,
2902};
2903
2904static struct xprt_class xs_tcp_transport = {
2905 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2906 .name = "tcp",
2907 .owner = THIS_MODULE,
f300baba 2908 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2909 .setup = xs_setup_tcp,
2910};
2911
f300baba
AB		 2912static struct xprt_class xs_bc_tcp_transport = {
2913 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2914 .name = "tcp NFSv4.1 backchannel",
2915 .owner = THIS_MODULE,
2916 .ident = XPRT_TRANSPORT_BC_TCP,
2917 .setup = xs_setup_bc_tcp,
2918};
2919
282b32e1 2920/**
bc25571e 2921 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2922 *
2923 */
2924int init_socket_xprt(void)
2925{
fbf76683 2926#ifdef RPC_DEBUG
2b1bec5f 2927 if (!sunrpc_table_header)
0b4d4147 2928 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2929#endif
2930
176e21ee 2931 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2932 xprt_register_transport(&xs_udp_transport);
2933 xprt_register_transport(&xs_tcp_transport);
f300baba 2934 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2935
282b32e1
CL		 2936 return 0;
2937}
2938
2939/**
bc25571e 2940 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2941 *
2942 */
2943void cleanup_socket_xprt(void)
2944{
fbf76683
CL		 2945#ifdef RPC_DEBUG
2946 if (sunrpc_table_header) {
2947 unregister_sysctl_table(sunrpc_table_header);
2948 sunrpc_table_header = NULL;
2949 }
2950#endif
bc25571e 2951
176e21ee 2952 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2953 xprt_unregister_transport(&xs_udp_transport);
2954 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2955 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2956}
cbf11071 2957
9bbb9e5a
RR		 2958static int param_set_uint_minmax(const char *val,
2959 const struct kernel_param *kp,
cbf11071
TM		 2960 unsigned int min, unsigned int max)
2961{
2962 unsigned long num;
2963 int ret;
2964
2965 if (!val)
2966 return -EINVAL;
2967 ret = strict_strtoul(val, 0, &num);
2968 if (ret == -EINVAL || num < min || num > max)
2969 return -EINVAL;
2970 *((unsigned int *)kp->arg) = num;
2971 return 0;
2972}
2973
9bbb9e5a 2974static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 2975{
2976 return param_set_uint_minmax(val, kp,
2977 RPC_MIN_RESVPORT,
2978 RPC_MAX_RESVPORT);
2979}
2980
9bbb9e5a
RR		 2981static struct kernel_param_ops param_ops_portnr = {
2982 .set = param_set_portnr,
2983 .get = param_get_uint,
2984};
2985
cbf11071
TM		 2986#define param_check_portnr(name, p) \
2987 __param_check(name, p, unsigned int);
2988
2989module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2990module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2991
9bbb9e5a
RR		 2992static int param_set_slot_table_size(const char *val,
2993 const struct kernel_param *kp)
cbf11071
TM		 2994{
2995 return param_set_uint_minmax(val, kp,
2996 RPC_MIN_SLOT_TABLE,
2997 RPC_MAX_SLOT_TABLE);
2998}
2999
9bbb9e5a
RR		 3000static struct kernel_param_ops param_ops_slot_table_size = {
3001 .set = param_set_slot_table_size,
3002 .get = param_get_uint,
3003};
3004
cbf11071
TM		 3005#define param_check_slot_table_size(name, p) \
3006 __param_check(name, p, unsigned int);
3007
d9ba131d
TM		 3008static int param_set_max_slot_table_size(const char *val,
3009 const struct kernel_param *kp)
3010{
3011 return param_set_uint_minmax(val, kp,
3012 RPC_MIN_SLOT_TABLE,
3013 RPC_MAX_SLOT_TABLE_LIMIT);
3014}
3015
3016static struct kernel_param_ops param_ops_max_slot_table_size = {
3017 .set = param_set_max_slot_table_size,
3018 .get = param_get_uint,
3019};
3020
3021#define param_check_max_slot_table_size(name, p) \
3022 __param_check(name, p, unsigned int);
3023
cbf11071
TM		 3024module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3025 slot_table_size, 0644);
d9ba131d
TM		 3026module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3027 max_slot_table_size, 0644);
cbf11071
TM		 3028module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3029 slot_table_size, 0644);
3030
Linux kernel - Deliverables
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