]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - net/sunrpc/xprtsock.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
SUNRPC: Add barriers to ensure read ordering in rpc_wake_up_task_queue_locked
[mirror_ubuntu-artful-kernel.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
5976687a 36#include <linux/sunrpc/addr.h>
02107148 37#include <linux/sunrpc/sched.h>
4cfc7e60 38#include <linux/sunrpc/svcsock.h>
49c36fcc 39#include <linux/sunrpc/xprtsock.h>
a246b010 40#include <linux/file.h>
9e00abc3 41#ifdef CONFIG_SUNRPC_BACKCHANNEL
44b98efd
RL		 42#include <linux/sunrpc/bc_xprt.h>
43#endif
a246b010
CL		 44
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
4cfc7e60 50#include "sunrpc.h"
176e21ee
CL		 51
52static void xs_close(struct rpc_xprt *xprt);
53
c556b754
CL		 54/*
55 * xprtsock tunables
56 */
09acfea5
TM		 57static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
58static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
59static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 60
09acfea5
TM		 61static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
62static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 63
7d1e8255 64#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 65static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 66
fbf76683
CL		 67/*
68 * We can register our own files under /proc/sys/sunrpc by
69 * calling register_sysctl_table() again. The files in that
70 * directory become the union of all files registered there.
71 *
72 * We simply need to make sure that we don't collide with
73 * someone else's file names!
74 */
75
76#ifdef RPC_DEBUG
77
78static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
79static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 80static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 81static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
82static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
83
84static struct ctl_table_header *sunrpc_table_header;
85
86/*
87 * FIXME: changing the UDP slot table size should also resize the UDP
88 * socket buffers for existing UDP transports
89 */
90static ctl_table xs_tunables_table[] = {
91 {
fbf76683
CL		 92 .procname = "udp_slot_table_entries",
93 .data = &xprt_udp_slot_table_entries,
94 .maxlen = sizeof(unsigned int),
95 .mode = 0644,
6d456111 96 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 97 .extra1 = &min_slot_table_size,
98 .extra2 = &max_slot_table_size
99 },
100 {
fbf76683
CL		 101 .procname = "tcp_slot_table_entries",
102 .data = &xprt_tcp_slot_table_entries,
103 .maxlen = sizeof(unsigned int),
104 .mode = 0644,
6d456111 105 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 106 .extra1 = &min_slot_table_size,
107 .extra2 = &max_slot_table_size
108 },
d9ba131d
TM		 109 {
110 .procname = "tcp_max_slot_table_entries",
111 .data = &xprt_max_tcp_slot_table_entries,
112 .maxlen = sizeof(unsigned int),
113 .mode = 0644,
114 .proc_handler = proc_dointvec_minmax,
115 .extra1 = &min_slot_table_size,
116 .extra2 = &max_tcp_slot_table_limit
117 },
fbf76683 118 {
fbf76683
CL		 119 .procname = "min_resvport",
120 .data = &xprt_min_resvport,
121 .maxlen = sizeof(unsigned int),
122 .mode = 0644,
6d456111 123 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 124 .extra1 = &xprt_min_resvport_limit,
125 .extra2 = &xprt_max_resvport_limit
126 },
127 {
fbf76683
CL		 128 .procname = "max_resvport",
129 .data = &xprt_max_resvport,
130 .maxlen = sizeof(unsigned int),
131 .mode = 0644,
6d456111 132 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 133 .extra1 = &xprt_min_resvport_limit,
134 .extra2 = &xprt_max_resvport_limit
135 },
25fe6142
TM		 136 {
137 .procname = "tcp_fin_timeout",
138 .data = &xs_tcp_fin_timeout,
139 .maxlen = sizeof(xs_tcp_fin_timeout),
140 .mode = 0644,
6d456111 141 .proc_handler = proc_dointvec_jiffies,
fbf76683 142 },
f8572d8f 143 { },
fbf76683
CL		 144};
145
146static ctl_table sunrpc_table[] = {
147 {
fbf76683
CL		 148 .procname = "sunrpc",
149 .mode = 0555,
150 .child = xs_tunables_table
151 },
f8572d8f 152 { },
fbf76683
CL		 153};
154
155#endif
156
03bf4b70
CL		 157/*
158 * Wait duration for a reply from the RPC portmapper.
159 */
160#define XS_BIND_TO (60U * HZ)
161
162/*
163 * Delay if a UDP socket connect error occurs. This is most likely some
164 * kind of resource problem on the local host.
165 */
166#define XS_UDP_REEST_TO (2U * HZ)
167
168/*
169 * The reestablish timeout allows clients to delay for a bit before attempting
170 * to reconnect to a server that just dropped our connection.
171 *
172 * We implement an exponential backoff when trying to reestablish a TCP
173 * transport connection with the server. Some servers like to drop a TCP
174 * connection when they are overworked, so we start with a short timeout and
175 * increase over time if the server is down or not responding.
176 */
177#define XS_TCP_INIT_REEST_TO (3U * HZ)
178#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
179
180/*
181 * TCP idle timeout; client drops the transport socket if it is idle
182 * for this long. Note that we also timeout UDP sockets to prevent
183 * holding port numbers when there is no RPC traffic.
184 */
185#define XS_IDLE_DISC_TO (5U * 60 * HZ)
186
a246b010
CL		 187#ifdef RPC_DEBUG
188# undef RPC_DEBUG_DATA
9903cd1c 189# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 190#endif
191
a246b010 192#ifdef RPC_DEBUG_DATA
9903cd1c 193static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 194{
9903cd1c
CL		 195 u8 *buf = (u8 *) packet;
196 int j;
a246b010 197
46121cf7 198 dprintk("RPC: %s\n", msg);
a246b010
CL		 199 for (j = 0; j < count && j < 128; j += 4) {
200 if (!(j & 31)) {
201 if (j)
202 dprintk("\n");
203 dprintk("0x%04x ", j);
204 }
205 dprintk("%02x%02x%02x%02x ",
206 buf[j], buf[j+1], buf[j+2], buf[j+3]);
207 }
208 dprintk("\n");
209}
210#else
9903cd1c 211static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 212{
213 /* NOP */
214}
215#endif
216
ffc2e518
CL		 217struct sock_xprt {
218 struct rpc_xprt xprt;
ee0ac0c2
CL		 219
220 /*
221 * Network layer
222 */
223 struct socket * sock;
224 struct sock * inet;
51971139
CL		 225
226 /*
227 * State of TCP reply receive
228 */
229 __be32 tcp_fraghdr,
b76ce561
TM		 230 tcp_xid,
231 tcp_calldir;
51971139
CL		 232
233 u32 tcp_offset,
234 tcp_reclen;
235
236 unsigned long tcp_copied,
237 tcp_flags;
c8475461
CL		 238
239 /*
240 * Connection of transports
241 */
34161db6 242 struct delayed_work connect_worker;
fbfffbd5
CL		 243 struct sockaddr_storage srcaddr;
244 unsigned short srcport;
7c6e066e
CL		 245
246 /*
247 * UDP socket buffer size parameters
248 */
249 size_t rcvsize,
250 sndsize;
314dfd79
CL		 251
252 /*
253 * Saved socket callback addresses
254 */
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(struct sock *);
ffc2e518
CL		 258};
259
e136d092
CL		 260/*
261 * TCP receive state flags
262 */
263#define TCP_RCV_LAST_FRAG (1UL << 0)
264#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265#define TCP_RCV_COPY_XID (1UL << 2)
266#define TCP_RCV_COPY_DATA (1UL << 3)
f4a2e418
RL		 267#define TCP_RCV_READ_CALLDIR (1UL << 4)
268#define TCP_RCV_COPY_CALLDIR (1UL << 5)
18dca02a
RL		 269
270/*
271 * TCP RPC flags
272 */
f4a2e418 273#define TCP_RPC_REPLY (1UL << 6)
e136d092 274
95392c59
CL		 275static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
276{
277 return (struct sockaddr *) &xprt->addr;
278}
279
176e21ee
CL		 280static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
281{
282 return (struct sockaddr_un *) &xprt->addr;
283}
284
95392c59 285static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 286{
95392c59
CL		 287 return (struct sockaddr_in *) &xprt->addr;
288}
289
290static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
291{
292 return (struct sockaddr_in6 *) &xprt->addr;
293}
294
c877b849 295static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 296{
c877b849 297 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 298 struct sockaddr_in6 *sin6;
299 struct sockaddr_in *sin;
176e21ee 300 struct sockaddr_un *sun;
c877b849 301 char buf[128];
edb267a6 302
9dc3b095 303 switch (sap->sa_family) {
176e21ee
CL		 304 case AF_LOCAL:
305 sun = xs_addr_un(xprt);
306 strlcpy(buf, sun->sun_path, sizeof(buf));
307 xprt->address_strings[RPC_DISPLAY_ADDR] =
308 kstrdup(buf, GFP_KERNEL);
309 break;
9dc3b095 310 case AF_INET:
176e21ee
CL		 311 (void)rpc_ntop(sap, buf, sizeof(buf));
312 xprt->address_strings[RPC_DISPLAY_ADDR] =
313 kstrdup(buf, GFP_KERNEL);
9dc3b095 314 sin = xs_addr_in(xprt);
fc0b5791 315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 316 break;
317 case AF_INET6:
176e21ee
CL		 318 (void)rpc_ntop(sap, buf, sizeof(buf));
319 xprt->address_strings[RPC_DISPLAY_ADDR] =
320 kstrdup(buf, GFP_KERNEL);
9dc3b095 321 sin6 = xs_addr_in6(xprt);
fc0b5791 322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 323 break;
324 default:
325 BUG();
756805e7 326 }
176e21ee 327
9dc3b095 328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 329}
330
9dc3b095 331static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 332{
9dc3b095
CL		 333 struct sockaddr *sap = xs_addr(xprt);
334 char buf[128];
4b6473fb 335
81160e66 336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 338
81160e66 339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
341}
4b6473fb 342
9dc3b095
CL		 343static void xs_format_peer_addresses(struct rpc_xprt *xprt,
344 const char *protocol,
345 const char *netid)
c877b849 346{
b454ae90 347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 348 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 349 xs_format_common_peer_addresses(xprt);
9dc3b095 350 xs_format_common_peer_ports(xprt);
edb267a6 351}
4b6473fb 352
9dc3b095 353static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 354{
9dc3b095
CL		 355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 357
9dc3b095 358 xs_format_common_peer_ports(xprt);
edb267a6
CL		 359}
360
361static void xs_free_peer_addresses(struct rpc_xprt *xprt)
362{
33e01dc7
CL		 363 unsigned int i;
364
365 for (i = 0; i < RPC_DISPLAY_MAX; i++)
366 switch (i) {
367 case RPC_DISPLAY_PROTO:
368 case RPC_DISPLAY_NETID:
369 continue;
370 default:
371 kfree(xprt->address_strings[i]);
372 }
edb267a6
CL		 373}
374
b4b5cc85
CL		 375#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
376
24c5684b 377static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 378{
b4b5cc85
CL		 379 struct msghdr msg = {
380 .msg_name = addr,
381 .msg_namelen = addrlen,
24c5684b
TM		 382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
383 };
384 struct kvec iov = {
385 .iov_base = vec->iov_base + base,
386 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 387 };
388
24c5684b 389 if (iov.iov_len != 0)
b4b5cc85
CL		 390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
391 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
392}
393
24c5684b 394static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
b4b5cc85 395{
24c5684b
TM		 396 struct page **ppage;
397 unsigned int remainder;
398 int err, sent = 0;
399
400 remainder = xdr->page_len - base;
401 base += xdr->page_base;
402 ppage = xdr->pages + (base >> PAGE_SHIFT);
403 base &= ~PAGE_MASK;
404 for(;;) {
405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
406 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 407
24c5684b
TM		 408 remainder -= len;
409 if (remainder != 0 || more)
410 flags |= MSG_MORE;
411 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
412 if (remainder == 0 || err != len)
413 break;
414 sent += err;
415 ppage++;
416 base = 0;
417 }
418 if (sent == 0)
419 return err;
420 if (err > 0)
421 sent += err;
422 return sent;
b4b5cc85
CL		 423}
424
9903cd1c
CL		 425/**
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
432 *
a246b010 433 */
24c5684b 434static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
a246b010 435{
24c5684b
TM		 436 unsigned int remainder = xdr->len - base;
437 int err, sent = 0;
a246b010 438
262965f5 439 if (unlikely(!sock))
fba91afb 440 return -ENOTSOCK;
262965f5
CL		 441
442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 443 if (base != 0) {
444 addr = NULL;
445 addrlen = 0;
446 }
262965f5 447
24c5684b
TM		 448 if (base < xdr->head[0].iov_len || addr != NULL) {
449 unsigned int len = xdr->head[0].iov_len - base;
450 remainder -= len;
451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
452 if (remainder == 0 || err != len)
a246b010 453 goto out;
24c5684b 454 sent += err;
a246b010
CL		 455 base = 0;
456 } else
24c5684b 457 base -= xdr->head[0].iov_len;
a246b010 458
24c5684b
TM		 459 if (base < xdr->page_len) {
460 unsigned int len = xdr->page_len - base;
461 remainder -= len;
462 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
463 if (remainder == 0 || err != len)
a246b010 464 goto out;
24c5684b 465 sent += err;
a246b010 466 base = 0;
24c5684b
TM		 467 } else
468 base -= xdr->page_len;
469
470 if (base >= xdr->tail[0].iov_len)
471 return sent;
472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 473out:
24c5684b
TM		 474 if (sent == 0)
475 return err;
476 if (err > 0)
477 sent += err;
478 return sent;
a246b010
CL		 479}
480
b6ddf64f
TM		 481static void xs_nospace_callback(struct rpc_task *task)
482{
483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
484
485 transport->inet->sk_write_pending--;
486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
487}
488
9903cd1c 489/**
262965f5
CL		 490 * xs_nospace - place task on wait queue if transmit was incomplete
491 * @task: task to put to sleep
9903cd1c 492 *
a246b010 493 */
5e3771ce 494static int xs_nospace(struct rpc_task *task)
a246b010 495{
262965f5
CL		 496 struct rpc_rqst *req = task->tk_rqstp;
497 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
24ca9a84 499 int ret = -EAGAIN;
a246b010 500
46121cf7 501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 502 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
503 req->rq_slen);
504
b6ddf64f
TM		 505 /* Protect against races with write_space */
506 spin_lock_bh(&xprt->transport_lock);
507
508 /* Don't race with disconnect */
509 if (xprt_connected(xprt)) {
510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
511 /*
512 * Notify TCP that we're limited by the application
513 * window size
514 */
515 set_bit(SOCK_NOSPACE, &transport->sock->flags);
516 transport->inet->sk_write_pending++;
517 /* ...and wait for more buffer space */
518 xprt_wait_for_buffer_space(task, xs_nospace_callback);
519 }
520 } else {
521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 522 ret = -ENOTCONN;
b6ddf64f 523 }
262965f5 524
b6ddf64f 525 spin_unlock_bh(&xprt->transport_lock);
5e3771ce 526 return ret;
262965f5
CL		 527}
528
61677eee
CL		 529/*
530 * Construct a stream transport record marker in @buf.
531 */
532static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
533{
534 u32 reclen = buf->len - sizeof(rpc_fraghdr);
535 rpc_fraghdr *base = buf->head[0].iov_base;
536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
537}
538
176e21ee
CL		 539/**
540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
541 * @task: RPC task that manages the state of an RPC request
542 *
543 * Return values:
544 * 0: The request has been sent
545 * EAGAIN: The socket was blocked, please call again later to
546 * complete the request
547 * ENOTCONN: Caller needs to invoke connect logic then call again
548 * other: Some other error occured, the request was not sent
549 */
550static int xs_local_send_request(struct rpc_task *task)
551{
552 struct rpc_rqst *req = task->tk_rqstp;
553 struct rpc_xprt *xprt = req->rq_xprt;
554 struct sock_xprt *transport =
555 container_of(xprt, struct sock_xprt, xprt);
556 struct xdr_buf *xdr = &req->rq_snd_buf;
557 int status;
558
559 xs_encode_stream_record_marker(&req->rq_snd_buf);
560
561 xs_pktdump("packet data:",
562 req->rq_svec->iov_base, req->rq_svec->iov_len);
563
564 status = xs_sendpages(transport->sock, NULL, 0,
565 xdr, req->rq_bytes_sent);
566 dprintk("RPC: %s(%u) = %d\n",
567 __func__, xdr->len - req->rq_bytes_sent, status);
568 if (likely(status >= 0)) {
569 req->rq_bytes_sent += status;
570 req->rq_xmit_bytes_sent += status;
571 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
572 req->rq_bytes_sent = 0;
573 return 0;
574 }
575 status = -EAGAIN;
576 }
577
578 switch (status) {
579 case -EAGAIN:
580 status = xs_nospace(task);
581 break;
582 default:
583 dprintk("RPC: sendmsg returned unrecognized error %d\n",
584 -status);
585 case -EPIPE:
586 xs_close(xprt);
587 status = -ENOTCONN;
588 }
589
590 return status;
591}
592
262965f5
CL		 593/**
594 * xs_udp_send_request - write an RPC request to a UDP socket
595 * @task: address of RPC task that manages the state of an RPC request
596 *
597 * Return values:
598 * 0: The request has been sent
599 * EAGAIN: The socket was blocked, please call again later to
600 * complete the request
601 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 602 * other: Some other error occurred, the request was not sent
262965f5
CL		 603 */
604static int xs_udp_send_request(struct rpc_task *task)
605{
606 struct rpc_rqst *req = task->tk_rqstp;
607 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5
CL		 609 struct xdr_buf *xdr = &req->rq_snd_buf;
610 int status;
a246b010 611
9903cd1c 612 xs_pktdump("packet data:",
a246b010
CL		 613 req->rq_svec->iov_base,
614 req->rq_svec->iov_len);
615
01d37c42
TM		 616 if (!xprt_bound(xprt))
617 return -ENOTCONN;
ee0ac0c2 618 status = xs_sendpages(transport->sock,
95392c59 619 xs_addr(xprt),
ee0ac0c2
CL		 620 xprt->addrlen, xdr,
621 req->rq_bytes_sent);
a246b010 622
46121cf7 623 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 624 xdr->len - req->rq_bytes_sent, status);
a246b010 625
2199700f 626 if (status >= 0) {
d60dbb20 627 req->rq_xmit_bytes_sent += status;
2199700f
TM		 628 if (status >= req->rq_slen)
629 return 0;
630 /* Still some bytes left; set up for a retry later. */
262965f5 631 status = -EAGAIN;
2199700f 632 }
a246b010 633
262965f5 634 switch (status) {
fba91afb
TM		 635 case -ENOTSOCK:
636 status = -ENOTCONN;
637 /* Should we call xs_close() here? */
638 break;
b6ddf64f 639 case -EAGAIN:
5e3771ce 640 status = xs_nospace(task);
b6ddf64f 641 break;
c8485e4d
TM		 642 default:
643 dprintk("RPC: sendmsg returned unrecognized error %d\n",
644 -status);
262965f5
CL		 645 case -ENETUNREACH:
646 case -EPIPE:
a246b010
CL		 647 case -ECONNREFUSED:
648 /* When the server has died, an ICMP port unreachable message
9903cd1c 649 * prompts ECONNREFUSED. */
b6ddf64f 650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 651 }
5fe46e9d 652
262965f5 653 return status;
a246b010
CL		 654}
655
e06799f9
TM		 656/**
657 * xs_tcp_shutdown - gracefully shut down a TCP socket
658 * @xprt: transport
659 *
660 * Initiates a graceful shutdown of the TCP socket by calling the
661 * equivalent of shutdown(SHUT_WR);
662 */
663static void xs_tcp_shutdown(struct rpc_xprt *xprt)
664{
665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
666 struct socket *sock = transport->sock;
667
668 if (sock != NULL)
669 kernel_sock_shutdown(sock, SHUT_WR);
670}
671
9903cd1c 672/**
262965f5 673 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 674 * @task: address of RPC task that manages the state of an RPC request
675 *
676 * Return values:
262965f5
CL		 677 * 0: The request has been sent
678 * EAGAIN: The socket was blocked, please call again later to
679 * complete the request
680 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 681 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 682 *
683 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 684 * if sendmsg is not able to make progress?
9903cd1c 685 */
262965f5 686static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 687{
688 struct rpc_rqst *req = task->tk_rqstp;
689 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 691 struct xdr_buf *xdr = &req->rq_snd_buf;
b595bb15 692 int status;
a246b010 693
61677eee 694 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 695
262965f5
CL		 696 xs_pktdump("packet data:",
697 req->rq_svec->iov_base,
698 req->rq_svec->iov_len);
a246b010
CL		 699
700 /* Continue transmitting the packet/record. We must be careful
701 * to cope with writespace callbacks arriving _after_ we have
262965f5 702 * called sendmsg(). */
a246b010 703 while (1) {
ee0ac0c2
CL		 704 status = xs_sendpages(transport->sock,
705 NULL, 0, xdr, req->rq_bytes_sent);
a246b010 706
46121cf7 707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 708 xdr->len - req->rq_bytes_sent, status);
a246b010 709
262965f5 710 if (unlikely(status < 0))
a246b010 711 break;
a246b010 712
262965f5
CL		 713 /* If we've sent the entire packet, immediately
714 * reset the count of bytes sent. */
715 req->rq_bytes_sent += status;
d60dbb20 716 req->rq_xmit_bytes_sent += status;
262965f5
CL		 717 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
718 req->rq_bytes_sent = 0;
719 return 0;
720 }
a246b010 721
06b4b681
TM		 722 if (status != 0)
723 continue;
a246b010 724 status = -EAGAIN;
06b4b681 725 break;
a246b010
CL		 726 }
727
262965f5 728 switch (status) {
fba91afb
TM		 729 case -ENOTSOCK:
730 status = -ENOTCONN;
731 /* Should we call xs_close() here? */
732 break;
262965f5 733 case -EAGAIN:
5e3771ce 734 status = xs_nospace(task);
262965f5 735 break;
c8485e4d
TM		 736 default:
737 dprintk("RPC: sendmsg returned unrecognized error %d\n",
738 -status);
262965f5 739 case -ECONNRESET:
2a9e1cfa
TM		 740 xs_tcp_shutdown(xprt);
741 case -ECONNREFUSED:
262965f5 742 case -ENOTCONN:
b9d2bb2e 743 case -EPIPE:
b6ddf64f 744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 745 }
5fe46e9d 746
a246b010
CL		 747 return status;
748}
749
e0ab53de
TM		 750/**
751 * xs_tcp_release_xprt - clean up after a tcp transmission
752 * @xprt: transport
753 * @task: rpc task
754 *
755 * This cleans up if an error causes us to abort the transmission of a request.
756 * In this case, the socket may need to be reset in order to avoid confusing
757 * the server.
758 */
759static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
760{
761 struct rpc_rqst *req;
762
763 if (task != xprt->snd_task)
764 return;
765 if (task == NULL)
766 goto out_release;
767 req = task->tk_rqstp;
43cedbf0
TM		 768 if (req == NULL)
769 goto out_release;
e0ab53de
TM		 770 if (req->rq_bytes_sent == 0)
771 goto out_release;
772 if (req->rq_bytes_sent == req->rq_snd_buf.len)
773 goto out_release;
a4f0835c 774 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 775out_release:
776 xprt_release_xprt(xprt, task);
777}
778
2a9e1cfa
TM		 779static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
780{
781 transport->old_data_ready = sk->sk_data_ready;
782 transport->old_state_change = sk->sk_state_change;
783 transport->old_write_space = sk->sk_write_space;
2a9e1cfa
TM		 784}
785
786static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
787{
788 sk->sk_data_ready = transport->old_data_ready;
789 sk->sk_state_change = transport->old_state_change;
790 sk->sk_write_space = transport->old_write_space;
2a9e1cfa
TM		 791}
792
fe315e76 793static void xs_reset_transport(struct sock_xprt *transport)
a246b010 794{
ee0ac0c2
CL		 795 struct socket *sock = transport->sock;
796 struct sock *sk = transport->inet;
a246b010 797
fe315e76
CL		 798 if (sk == NULL)
799 return;
9903cd1c 800
246408dc
TM		 801 transport->srcport = 0;
802
a246b010 803 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 804 transport->inet = NULL;
805 transport->sock = NULL;
a246b010 806
9903cd1c 807 sk->sk_user_data = NULL;
2a9e1cfa
TM		 808
809 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 810 write_unlock_bh(&sk->sk_callback_lock);
811
9903cd1c 812 sk->sk_no_check = 0;
a246b010
CL		 813
814 sock_release(sock);
fe315e76
CL		 815}
816
817/**
818 * xs_close - close a socket
819 * @xprt: transport
820 *
821 * This is used when all requests are complete; ie, no DRC state remains
822 * on the server we want to save.
f75e6745
TM		 823 *
824 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
825 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 826 */
827static void xs_close(struct rpc_xprt *xprt)
828{
829 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
830
831 dprintk("RPC: xs_close xprt %p\n", xprt);
832
833 xs_reset_transport(transport);
61d0a8e6 834 xprt->reestablish_timeout = 0;
fe315e76 835
632e3bdc 836 smp_mb__before_clear_bit();
7d1e8255 837 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 838 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 839 clear_bit(XPRT_CLOSING, &xprt->state);
632e3bdc 840 smp_mb__after_clear_bit();
62da3b24 841 xprt_disconnect_done(xprt);
a246b010
CL		 842}
843
f75e6745
TM		 844static void xs_tcp_close(struct rpc_xprt *xprt)
845{
846 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
847 xs_close(xprt);
848 else
849 xs_tcp_shutdown(xprt);
850}
851
9903cd1c
CL		 852/**
853 * xs_destroy - prepare to shutdown a transport
854 * @xprt: doomed transport
855 *
856 */
857static void xs_destroy(struct rpc_xprt *xprt)
a246b010 858{
c8475461
CL		 859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
860
46121cf7 861 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 862
afe2c511 863 cancel_delayed_work_sync(&transport->connect_worker);
a246b010 864
9903cd1c 865 xs_close(xprt);
edb267a6 866 xs_free_peer_addresses(xprt);
e204e621 867 xprt_free(xprt);
bc25571e 868 module_put(THIS_MODULE);
a246b010
CL		 869}
870
9903cd1c
CL		 871static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
872{
873 return (struct rpc_xprt *) sk->sk_user_data;
874}
875
176e21ee
CL		 876static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
877{
878 struct xdr_skb_reader desc = {
879 .skb = skb,
880 .offset = sizeof(rpc_fraghdr),
881 .count = skb->len - sizeof(rpc_fraghdr),
882 };
883
884 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
885 return -1;
886 if (desc.count)
887 return -1;
888 return 0;
889}
890
891/**
892 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
893 * @sk: socket with data to read
894 * @len: how much data to read
895 *
896 * Currently this assumes we can read the whole reply in a single gulp.
897 */
898static void xs_local_data_ready(struct sock *sk, int len)
899{
900 struct rpc_task *task;
901 struct rpc_xprt *xprt;
902 struct rpc_rqst *rovr;
903 struct sk_buff *skb;
904 int err, repsize, copied;
905 u32 _xid;
906 __be32 *xp;
907
908 read_lock_bh(&sk->sk_callback_lock);
909 dprintk("RPC: %s...\n", __func__);
910 xprt = xprt_from_sock(sk);
911 if (xprt == NULL)
912 goto out;
913
914 skb = skb_recv_datagram(sk, 0, 1, &err);
915 if (skb == NULL)
916 goto out;
917
176e21ee
CL		 918 repsize = skb->len - sizeof(rpc_fraghdr);
919 if (repsize < 4) {
920 dprintk("RPC: impossible RPC reply size %d\n", repsize);
921 goto dropit;
922 }
923
924 /* Copy the XID from the skb... */
925 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
926 if (xp == NULL)
927 goto dropit;
928
929 /* Look up and lock the request corresponding to the given XID */
930 spin_lock(&xprt->transport_lock);
931 rovr = xprt_lookup_rqst(xprt, *xp);
932 if (!rovr)
933 goto out_unlock;
934 task = rovr->rq_task;
935
936 copied = rovr->rq_private_buf.buflen;
937 if (copied > repsize)
938 copied = repsize;
939
940 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
941 dprintk("RPC: sk_buff copy failed\n");
942 goto out_unlock;
943 }
944
945 xprt_complete_rqst(task, copied);
946
947 out_unlock:
948 spin_unlock(&xprt->transport_lock);
949 dropit:
950 skb_free_datagram(sk, skb);
951 out:
952 read_unlock_bh(&sk->sk_callback_lock);
953}
954
9903cd1c
CL		 955/**
956 * xs_udp_data_ready - "data ready" callback for UDP sockets
957 * @sk: socket with data to read
958 * @len: how much data to read
959 *
a246b010 960 */
9903cd1c 961static void xs_udp_data_ready(struct sock *sk, int len)
a246b010 962{
9903cd1c
CL		 963 struct rpc_task *task;
964 struct rpc_xprt *xprt;
a246b010 965 struct rpc_rqst *rovr;
9903cd1c 966 struct sk_buff *skb;
a246b010 967 int err, repsize, copied;
d8ed029d
AD		 968 u32 _xid;
969 __be32 *xp;
a246b010 970
f064af1e 971 read_lock_bh(&sk->sk_callback_lock);
46121cf7 972 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 973 if (!(xprt = xprt_from_sock(sk)))
a246b010 974 goto out;
a246b010
CL		 975
976 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
977 goto out;
978
a246b010
CL		 979 repsize = skb->len - sizeof(struct udphdr);
980 if (repsize < 4) {
46121cf7 981 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 982 goto dropit;
983 }
984
985 /* Copy the XID from the skb... */
986 xp = skb_header_pointer(skb, sizeof(struct udphdr),
987 sizeof(_xid), &_xid);
988 if (xp == NULL)
989 goto dropit;
990
991 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 992 spin_lock(&xprt->transport_lock);
a246b010
CL		 993 rovr = xprt_lookup_rqst(xprt, *xp);
994 if (!rovr)
995 goto out_unlock;
996 task = rovr->rq_task;
997
a246b010
CL		 998 if ((copied = rovr->rq_private_buf.buflen) > repsize)
999 copied = repsize;
1000
1001 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1002 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1003 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1004 goto out_unlock;
1781f7f5
HX		 1005 }
1006
1007 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1008
6a24dfb6 1009 xprt_adjust_cwnd(xprt, task, copied);
1570c1e4 1010 xprt_complete_rqst(task, copied);
a246b010
CL		 1011
1012 out_unlock:
4a0f8c04 1013 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1014 dropit:
1015 skb_free_datagram(sk, skb);
1016 out:
f064af1e 1017 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1018}
1019
a519fc7a
TM		 1020/*
1021 * Helper function to force a TCP close if the server is sending
1022 * junk and/or it has put us in CLOSE_WAIT
1023 */
1024static void xs_tcp_force_close(struct rpc_xprt *xprt)
1025{
1026 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1027 xprt_force_disconnect(xprt);
1028}
1029
dd456471 1030static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1031{
51971139 1032 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1033 size_t len, used;
1034 char *p;
1035
51971139
CL		 1036 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1037 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1038 used = xdr_skb_read_bits(desc, p, len);
51971139 1039 transport->tcp_offset += used;
a246b010
CL		 1040 if (used != len)
1041 return;
808012fb 1042
51971139
CL		 1043 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1044 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1045 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1046 else
e136d092 1047 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1048 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1049
e136d092 1050 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1051 transport->tcp_offset = 0;
808012fb 1052
a246b010 1053 /* Sanity check of the record length */
18dca02a 1054 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1055 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1056 xs_tcp_force_close(xprt);
9903cd1c 1057 return;
a246b010 1058 }
46121cf7 1059 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1060 transport->tcp_reclen);
a246b010
CL		 1061}
1062
51971139 1063static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1064{
51971139 1065 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1066 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1067 transport->tcp_offset = 0;
e136d092
CL		 1068 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1069 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1070 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1071 transport->tcp_copied = 0;
a246b010
CL		 1072 }
1073 }
1074}
1075
dd456471 1076static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1077{
1078 size_t len, used;
1079 char *p;
1080
51971139 1081 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1082 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1083 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1084 used = xdr_skb_read_bits(desc, p, len);
51971139 1085 transport->tcp_offset += used;
a246b010
CL		 1086 if (used != len)
1087 return;
e136d092 1088 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1089 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1090 transport->tcp_copied = 4;
18dca02a
RL		 1091 dprintk("RPC: reading %s XID %08x\n",
1092 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1093 : "request with",
51971139
CL		 1094 ntohl(transport->tcp_xid));
1095 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1096}
1097
18dca02a
RL		 1098static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1099 struct xdr_skb_reader *desc)
a246b010 1100{
18dca02a
RL		 1101 size_t len, used;
1102 u32 offset;
b76ce561 1103 char *p;
18dca02a
RL		 1104
1105 /*
1106 * We want transport->tcp_offset to be 8 at the end of this routine
1107 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1108 * When this function is called for the first time,
1109 * transport->tcp_offset is 4 (after having already read the xid).
1110 */
1111 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1112 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1113 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1114 p = ((char *) &transport->tcp_calldir) + offset;
1115 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1116 transport->tcp_offset += used;
1117 if (used != len)
1118 return;
f4a2e418 1119 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1120 /*
1121 * We don't yet have the XDR buffer, so we will write the calldir
1122 * out after we get the buffer from the 'struct rpc_rqst'
1123 */
b76ce561
TM		 1124 switch (ntohl(transport->tcp_calldir)) {
1125 case RPC_REPLY:
1126 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1127 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1128 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1129 break;
1130 case RPC_CALL:
1131 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1132 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1133 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1134 break;
1135 default:
1136 dprintk("RPC: invalid request message type\n");
a519fc7a 1137 xs_tcp_force_close(&transport->xprt);
b76ce561 1138 }
18dca02a
RL		 1139 xs_tcp_check_fraghdr(transport);
1140}
1141
44b98efd
RL		 1142static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1143 struct xdr_skb_reader *desc,
1144 struct rpc_rqst *req)
a246b010 1145{
44b98efd
RL		 1146 struct sock_xprt *transport =
1147 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1148 struct xdr_buf *rcvbuf;
1149 size_t len;
1150 ssize_t r;
1151
a246b010 1152 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1153
1154 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1155 /*
1156 * Save the RPC direction in the XDR buffer
1157 */
f4a2e418 1158 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1159 &transport->tcp_calldir,
1160 sizeof(transport->tcp_calldir));
1161 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1162 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1163 }
1164
a246b010 1165 len = desc->count;
51971139 1166 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1167 struct xdr_skb_reader my_desc;
a246b010 1168
51971139 1169 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1170 memcpy(&my_desc, desc, sizeof(my_desc));
1171 my_desc.count = len;
51971139 1172 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1173 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1174 desc->count -= r;
1175 desc->offset += r;
1176 } else
51971139 1177 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1178 desc, xdr_skb_read_bits);
a246b010
CL		 1179
1180 if (r > 0) {
51971139
CL		 1181 transport->tcp_copied += r;
1182 transport->tcp_offset += r;
a246b010
CL		 1183 }
1184 if (r != len) {
1185 /* Error when copying to the receive buffer,
1186 * usually because we weren't able to allocate
1187 * additional buffer pages. All we can do now
e136d092 1188 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1189 * will not receive any additional updates,
1190 * and time out.
1191 * Any remaining data from this record will
1192 * be discarded.
1193 */
e136d092 1194 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1195 dprintk("RPC: XID %08x truncated request\n",
51971139 1196 ntohl(transport->tcp_xid));
46121cf7
CL		 1197 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1198 "tcp_offset = %u, tcp_reclen = %u\n",
1199 xprt, transport->tcp_copied,
1200 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1201 return;
a246b010
CL		 1202 }
1203
46121cf7 1204 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1205 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1206 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1207 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1208 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1209
1210 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1211 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1212 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1213 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1214 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1215 }
44b98efd
RL		 1216}
1217
1218/*
1219 * Finds the request corresponding to the RPC xid and invokes the common
1220 * tcp read code to read the data.
1221 */
1222static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1223 struct xdr_skb_reader *desc)
1224{
1225 struct sock_xprt *transport =
1226 container_of(xprt, struct sock_xprt, xprt);
1227 struct rpc_rqst *req;
1228
1229 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1230
1231 /* Find and lock the request corresponding to this xid */
1232 spin_lock(&xprt->transport_lock);
1233 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1234 if (!req) {
1235 dprintk("RPC: XID %08x request not found!\n",
1236 ntohl(transport->tcp_xid));
1237 spin_unlock(&xprt->transport_lock);
1238 return -1;
1239 }
1240
1241 xs_tcp_read_common(xprt, desc, req);
1242
e136d092 1243 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1244 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1245
4a0f8c04 1246 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1247 return 0;
1248}
1249
9e00abc3 1250#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1251/*
1252 * Obtains an rpc_rqst previously allocated and invokes the common
1253 * tcp read code to read the data. The result is placed in the callback
1254 * queue.
1255 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1256 * connection and return -1.
1257 */
1258static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1259 struct xdr_skb_reader *desc)
1260{
1261 struct sock_xprt *transport =
1262 container_of(xprt, struct sock_xprt, xprt);
1263 struct rpc_rqst *req;
1264
1265 req = xprt_alloc_bc_request(xprt);
1266 if (req == NULL) {
1267 printk(KERN_WARNING "Callback slot table overflowed\n");
1268 xprt_force_disconnect(xprt);
1269 return -1;
1270 }
1271
1272 req->rq_xid = transport->tcp_xid;
1273 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1274 xs_tcp_read_common(xprt, desc, req);
1275
1276 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1277 struct svc_serv *bc_serv = xprt->bc_serv;
1278
1279 /*
1280 * Add callback request to callback list. The callback
1281 * service sleeps on the sv_cb_waitq waiting for new
1282 * requests. Wake it up after adding enqueing the
1283 * request.
1284 */
1285 dprintk("RPC: add callback request to list\n");
1286 spin_lock(&bc_serv->sv_cb_lock);
1287 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1288 spin_unlock(&bc_serv->sv_cb_lock);
1289 wake_up(&bc_serv->sv_cb_waitq);
1290 }
1291
1292 req->rq_private_buf.len = transport->tcp_copied;
1293
1294 return 0;
1295}
1296
1297static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1298 struct xdr_skb_reader *desc)
1299{
1300 struct sock_xprt *transport =
1301 container_of(xprt, struct sock_xprt, xprt);
1302
1303 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1304 xs_tcp_read_reply(xprt, desc) :
1305 xs_tcp_read_callback(xprt, desc);
1306}
1307#else
1308static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1309 struct xdr_skb_reader *desc)
1310{
1311 return xs_tcp_read_reply(xprt, desc);
1312}
9e00abc3 1313#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1314
1315/*
1316 * Read data off the transport. This can be either an RPC_CALL or an
1317 * RPC_REPLY. Relay the processing to helper functions.
1318 */
1319static void xs_tcp_read_data(struct rpc_xprt *xprt,
1320 struct xdr_skb_reader *desc)
1321{
1322 struct sock_xprt *transport =
1323 container_of(xprt, struct sock_xprt, xprt);
1324
1325 if (_xs_tcp_read_data(xprt, desc) == 0)
1326 xs_tcp_check_fraghdr(transport);
1327 else {
1328 /*
1329 * The transport_lock protects the request handling.
1330 * There's no need to hold it to update the tcp_flags.
1331 */
1332 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1333 }
a246b010
CL		 1334}
1335
dd456471 1336static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1337{
1338 size_t len;
1339
51971139 1340 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1341 if (len > desc->count)
1342 len = desc->count;
1343 desc->count -= len;
1344 desc->offset += len;
51971139 1345 transport->tcp_offset += len;
46121cf7 1346 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1347 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1348}
1349
9903cd1c 1350static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1351{
1352 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1353 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1354 struct xdr_skb_reader desc = {
a246b010
CL		 1355 .skb = skb,
1356 .offset = offset,
1357 .count = len,
9903cd1c 1358 };
a246b010 1359
46121cf7 1360 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1361 do {
1362 /* Read in a new fragment marker if necessary */
1363 /* Can we ever really expect to get completely empty fragments? */
e136d092 1364 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1365 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1366 continue;
1367 }
1368 /* Read in the xid if necessary */
e136d092 1369 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1370 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1371 continue;
1372 }
18dca02a 1373 /* Read in the call/reply flag */
f4a2e418 1374 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1375 xs_tcp_read_calldir(transport, &desc);
1376 continue;
1377 }
a246b010 1378 /* Read in the request data */
e136d092 1379 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1380 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1381 continue;
1382 }
1383 /* Skip over any trailing bytes on short reads */
51971139 1384 xs_tcp_read_discard(transport, &desc);
a246b010 1385 } while (desc.count);
46121cf7 1386 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1387 return len - desc.count;
1388}
1389
9903cd1c
CL		 1390/**
1391 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1392 * @sk: socket with data to read
1393 * @bytes: how much data to read
1394 *
1395 */
1396static void xs_tcp_data_ready(struct sock *sk, int bytes)
a246b010
CL		 1397{
1398 struct rpc_xprt *xprt;
1399 read_descriptor_t rd_desc;
ff2d7db8 1400 int read;
a246b010 1401
46121cf7
CL		 1402 dprintk("RPC: xs_tcp_data_ready...\n");
1403
f064af1e 1404 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1405 if (!(xprt = xprt_from_sock(sk)))
a246b010 1406 goto out;
61d0a8e6
NB		 1407 /* Any data means we had a useful conversation, so
1408 * the we don't need to delay the next reconnect
1409 */
1410 if (xprt->reestablish_timeout)
1411 xprt->reestablish_timeout = 0;
1412
9903cd1c 1413 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1414 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1415 do {
1416 rd_desc.count = 65536;
1417 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1418 } while (read > 0);
a246b010 1419out:
f064af1e 1420 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1421}
1422
7d1e8255
TM		 1423/*
1424 * Do the equivalent of linger/linger2 handling for dealing with
1425 * broken servers that don't close the socket in a timely
1426 * fashion
1427 */
1428static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1429 unsigned long timeout)
1430{
1431 struct sock_xprt *transport;
1432
1433 if (xprt_test_and_set_connecting(xprt))
1434 return;
1435 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1436 transport = container_of(xprt, struct sock_xprt, xprt);
1437 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1438 timeout);
1439}
1440
1441static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1442{
1443 struct sock_xprt *transport;
1444
1445 transport = container_of(xprt, struct sock_xprt, xprt);
1446
1447 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1448 !cancel_delayed_work(&transport->connect_worker))
1449 return;
1450 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1451 xprt_clear_connecting(xprt);
1452}
1453
4bc1e68e 1454static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
7d1e8255
TM		 1455{
1456 smp_mb__before_clear_bit();
a519fc7a
TM		 1457 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1458 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1459 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1460 clear_bit(XPRT_CLOSING, &xprt->state);
1461 smp_mb__after_clear_bit();
4bc1e68e
TM		 1462}
1463
1464static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1465{
1466 xs_sock_reset_connection_flags(xprt);
7d1e8255
TM		 1467 /* Mark transport as closed and wake up all pending tasks */
1468 xprt_disconnect_done(xprt);
1469}
1470
9903cd1c
CL		 1471/**
1472 * xs_tcp_state_change - callback to handle TCP socket state changes
1473 * @sk: socket whose state has changed
1474 *
1475 */
1476static void xs_tcp_state_change(struct sock *sk)
a246b010 1477{
9903cd1c 1478 struct rpc_xprt *xprt;
a246b010 1479
f064af1e 1480 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1481 if (!(xprt = xprt_from_sock(sk)))
1482 goto out;
46121cf7 1483 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1484 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1485 sk->sk_state, xprt_connected(xprt),
1486 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1487 sock_flag(sk, SOCK_ZAPPED),
1488 sk->sk_shutdown);
a246b010
CL		 1489
1490 switch (sk->sk_state) {
1491 case TCP_ESTABLISHED:
f064af1e 1492 spin_lock(&xprt->transport_lock);
a246b010 1493 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1494 struct sock_xprt *transport = container_of(xprt,
1495 struct sock_xprt, xprt);
1496
a246b010 1497 /* Reset TCP record info */
51971139
CL		 1498 transport->tcp_offset = 0;
1499 transport->tcp_reclen = 0;
1500 transport->tcp_copied = 0;
e136d092
CL		 1501 transport->tcp_flags =
1502 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
51971139 1503
2a491991 1504 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1505 }
f064af1e 1506 spin_unlock(&xprt->transport_lock);
a246b010 1507 break;
3b948ae5
TM		 1508 case TCP_FIN_WAIT1:
1509 /* The client initiated a shutdown of the socket */
7c1d71cf 1510 xprt->connect_cookie++;
663b8858 1511 xprt->reestablish_timeout = 0;
3b948ae5
TM		 1512 set_bit(XPRT_CLOSING, &xprt->state);
1513 smp_mb__before_clear_bit();
1514 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1515 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 1516 smp_mb__after_clear_bit();
25fe6142 1517 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1518 break;
632e3bdc 1519 case TCP_CLOSE_WAIT:
3b948ae5 1520 /* The server initiated a shutdown of the socket */
7c1d71cf 1521 xprt->connect_cookie++;
d0bea455 1522 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1523 xs_tcp_force_close(xprt);
663b8858
TM		 1524 case TCP_CLOSING:
1525 /*
1526 * If the server closed down the connection, make sure that
1527 * we back off before reconnecting
1528 */
1529 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1530 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1531 break;
1532 case TCP_LAST_ACK:
670f9457 1533 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1534 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1535 smp_mb__before_clear_bit();
1536 clear_bit(XPRT_CONNECTED, &xprt->state);
1537 smp_mb__after_clear_bit();
1538 break;
1539 case TCP_CLOSE:
7d1e8255
TM		 1540 xs_tcp_cancel_linger_timeout(xprt);
1541 xs_sock_mark_closed(xprt);
a246b010
CL		 1542 }
1543 out:
f064af1e 1544 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1545}
1546
1f0fa154
IJ		 1547static void xs_write_space(struct sock *sk)
1548{
1549 struct socket *sock;
1550 struct rpc_xprt *xprt;
1551
1552 if (unlikely(!(sock = sk->sk_socket)))
1553 return;
1554 clear_bit(SOCK_NOSPACE, &sock->flags);
1555
1556 if (unlikely(!(xprt = xprt_from_sock(sk))))
1557 return;
1558 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1559 return;
1560
1561 xprt_write_space(xprt);
1562}
1563
9903cd1c 1564/**
c7b2cae8
CL		 1565 * xs_udp_write_space - callback invoked when socket buffer space
1566 * becomes available
9903cd1c
CL		 1567 * @sk: socket whose state has changed
1568 *
a246b010
CL		 1569 * Called when more output buffer space is available for this socket.
1570 * We try not to wake our writers until they can make "significant"
c7b2cae8 1571 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1572 * with a bunch of small requests.
1573 */
c7b2cae8 1574static void xs_udp_write_space(struct sock *sk)
a246b010 1575{
f064af1e 1576 read_lock_bh(&sk->sk_callback_lock);
a246b010 1577
c7b2cae8 1578 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1579 if (sock_writeable(sk))
1580 xs_write_space(sk);
a246b010 1581
f064af1e 1582 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1583}
a246b010 1584
c7b2cae8
CL		 1585/**
1586 * xs_tcp_write_space - callback invoked when socket buffer space
1587 * becomes available
1588 * @sk: socket whose state has changed
1589 *
1590 * Called when more output buffer space is available for this socket.
1591 * We try not to wake our writers until they can make "significant"
1592 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1593 * with a bunch of small requests.
1594 */
1595static void xs_tcp_write_space(struct sock *sk)
1596{
f064af1e 1597 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1598
1599 /* from net/core/stream.c:sk_stream_write_space */
1f0fa154
IJ		 1600 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1601 xs_write_space(sk);
b6ddf64f 1602
f064af1e 1603 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1604}
1605
470056c2 1606static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1607{
ee0ac0c2
CL		 1608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1609 struct sock *sk = transport->inet;
a246b010 1610
7c6e066e 1611 if (transport->rcvsize) {
a246b010 1612 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1613 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1614 }
7c6e066e 1615 if (transport->sndsize) {
a246b010 1616 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1617 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1618 sk->sk_write_space(sk);
1619 }
1620}
1621
43118c29 1622/**
470056c2 1623 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1624 * @xprt: generic transport
470056c2
CL		 1625 * @sndsize: requested size of send buffer, in bytes
1626 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1627 *
470056c2 1628 * Set socket send and receive buffer size limits.
43118c29 1629 */
470056c2 1630static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1631{
7c6e066e
CL		 1632 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1633
1634 transport->sndsize = 0;
470056c2 1635 if (sndsize)
7c6e066e
CL		 1636 transport->sndsize = sndsize + 1024;
1637 transport->rcvsize = 0;
470056c2 1638 if (rcvsize)
7c6e066e 1639 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1640
1641 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1642}
1643
46c0ee8b
CL		 1644/**
1645 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1646 * @task: task that timed out
1647 *
1648 * Adjust the congestion window after a retransmit timeout has occurred.
1649 */
6a24dfb6 1650static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1651{
6a24dfb6 1652 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
46c0ee8b
CL		 1653}
1654
b85d8806
CL		 1655static unsigned short xs_get_random_port(void)
1656{
1657 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1658 unsigned short rand = (unsigned short) net_random() % range;
1659 return rand + xprt_min_resvport;
1660}
1661
92200412
CL		 1662/**
1663 * xs_set_port - reset the port number in the remote endpoint address
1664 * @xprt: generic transport
1665 * @port: new port number
1666 *
1667 */
1668static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1669{
46121cf7 1670 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1671
9dc3b095
CL		 1672 rpc_set_port(xs_addr(xprt), port);
1673 xs_update_peer_port(xprt);
92200412
CL		 1674}
1675
5d4ec932 1676static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1677{
fbfffbd5 1678 unsigned short port = transport->srcport;
67a391d7
TM		 1679
1680 if (port == 0 && transport->xprt.resvport)
1681 port = xs_get_random_port();
1682 return port;
1683}
1684
baaf4e48 1685static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1686{
fbfffbd5
CL		 1687 if (transport->srcport != 0)
1688 transport->srcport = 0;
67a391d7
TM		 1689 if (!transport->xprt.resvport)
1690 return 0;
1691 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1692 return xprt_max_resvport;
1693 return --port;
1694}
beb59b68 1695static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1696{
beb59b68 1697 struct sockaddr_storage myaddr;
67a391d7 1698 int err, nloop = 0;
5d4ec932 1699 unsigned short port = xs_get_srcport(transport);
67a391d7 1700 unsigned short last;
a246b010 1701
beb59b68 1702 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1703 do {
beb59b68
PE		 1704 rpc_set_port((struct sockaddr *)&myaddr, port);
1705 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1706 transport->xprt.addrlen);
67a391d7 1707 if (port == 0)
d3bc9a1d 1708 break;
a246b010 1709 if (err == 0) {
fbfffbd5 1710 transport->srcport = port;
d3bc9a1d 1711 break;
a246b010 1712 }
67a391d7 1713 last = port;
baaf4e48 1714 port = xs_next_srcport(transport, port);
67a391d7
TM		 1715 if (port > last)
1716 nloop++;
1717 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1718
4232e863 1719 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1720 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1721 &((struct sockaddr_in *)&myaddr)->sin_addr,
1722 port, err ? "failed" : "ok", err);
1723 else
1724 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1725 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1726 port, err ? "failed" : "ok", err);
a246b010
CL		 1727 return err;
1728}
1729
176e21ee
CL		 1730/*
1731 * We don't support autobind on AF_LOCAL sockets
1732 */
1733static void xs_local_rpcbind(struct rpc_task *task)
1734{
3dc0da27
TM		 1735 rcu_read_lock();
1736 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1737 rcu_read_unlock();
176e21ee
CL		 1738}
1739
1740static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1741{
1742}
beb59b68 1743
ed07536e
PZ		 1744#ifdef CONFIG_DEBUG_LOCK_ALLOC
1745static struct lock_class_key xs_key[2];
1746static struct lock_class_key xs_slock_key[2];
1747
176e21ee
CL		 1748static inline void xs_reclassify_socketu(struct socket *sock)
1749{
1750 struct sock *sk = sock->sk;
1751
176e21ee
CL		 1752 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1753 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1754}
1755
8945ee5e 1756static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1757{
1758 struct sock *sk = sock->sk;
8945ee5e 1759
8945ee5e
CL		 1760 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1761 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1762}
ed07536e 1763
8945ee5e
CL		 1764static inline void xs_reclassify_socket6(struct socket *sock)
1765{
1766 struct sock *sk = sock->sk;
ed07536e 1767
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{
1b7a1819
WAA		 1774 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1775 if (sock_owned_by_user(sock->sk))
1776 return;
1777
4232e863 1778 switch (family) {
176e21ee
CL		 1779 case AF_LOCAL:
1780 xs_reclassify_socketu(sock);
1781 break;
4232e863 1782 case AF_INET:
6bc9638a 1783 xs_reclassify_socket4(sock);
4232e863
CL		 1784 break;
1785 case AF_INET6:
6bc9638a 1786 xs_reclassify_socket6(sock);
4232e863
CL		 1787 break;
1788 }
6bc9638a 1789}
ed07536e 1790#else
176e21ee
CL		 1791static inline void xs_reclassify_socketu(struct socket *sock)
1792{
1793}
1794
8945ee5e
CL		 1795static inline void xs_reclassify_socket4(struct socket *sock)
1796{
1797}
1798
1799static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1800{
1801}
6bc9638a
PE		 1802
1803static inline void xs_reclassify_socket(int family, struct socket *sock)
1804{
1805}
ed07536e
PZ		 1806#endif
1807
6bc9638a
PE		 1808static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1809 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1810{
1811 struct socket *sock;
1812 int err;
1813
6bc9638a 1814 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1815 if (err < 0) {
1816 dprintk("RPC: can't create %d transport socket (%d).\n",
1817 protocol, -err);
1818 goto out;
1819 }
6bc9638a 1820 xs_reclassify_socket(family, sock);
22f79326 1821
4cea288a
BH		 1822 err = xs_bind(transport, sock);
1823 if (err) {
22f79326
PE		 1824 sock_release(sock);
1825 goto out;
1826 }
1827
1828 return sock;
1829out:
1830 return ERR_PTR(err);
1831}
1832
176e21ee
CL		 1833static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1834 struct socket *sock)
1835{
1836 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1837 xprt);
1838
1839 if (!transport->inet) {
1840 struct sock *sk = sock->sk;
1841
1842 write_lock_bh(&sk->sk_callback_lock);
1843
1844 xs_save_old_callbacks(transport, sk);
1845
1846 sk->sk_user_data = xprt;
1847 sk->sk_data_ready = xs_local_data_ready;
1848 sk->sk_write_space = xs_udp_write_space;
176e21ee
CL		 1849 sk->sk_allocation = GFP_ATOMIC;
1850
1851 xprt_clear_connected(xprt);
1852
1853 /* Reset to new socket */
1854 transport->sock = sock;
1855 transport->inet = sk;
1856
1857 write_unlock_bh(&sk->sk_callback_lock);
1858 }
1859
1860 /* Tell the socket layer to start connecting... */
1861 xprt->stat.connect_count++;
1862 xprt->stat.connect_start = jiffies;
1863 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1864}
1865
1866/**
1867 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1868 * @xprt: RPC transport to connect
1869 * @transport: socket transport to connect
1870 * @create_sock: function to create a socket of the correct type
176e21ee 1871 */
dc107402 1872static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1873{
176e21ee
CL		 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;
4a20a988
TM		 1904 case -ECONNREFUSED:
1905 dprintk("RPC: xprt %p: connection refused for %s\n",
1906 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1907 break;
176e21ee
CL		 1908 default:
1909 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1910 __func__, -status,
1911 xprt->address_strings[RPC_DISPLAY_ADDR]);
1912 }
1913
1914out:
1915 xprt_clear_connecting(xprt);
1916 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1917 current->flags &= ~PF_FSTRANS;
dc107402
BF		 1918 return status;
1919}
1920
b6669737 1921static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1922{
dc107402
BF		 1923 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1924 int ret;
1925
1926 if (RPC_IS_ASYNC(task)) {
1927 /*
1928 * We want the AF_LOCAL connect to be resolved in the
1929 * filesystem namespace of the process making the rpc
1930 * call. Thus we connect synchronously.
1931 *
1932 * If we want to support asynchronous AF_LOCAL calls,
1933 * we'll need to figure out how to pass a namespace to
1934 * connect.
1935 */
1936 rpc_exit(task, -ENOTCONN);
1937 return;
1938 }
1939 ret = xs_local_setup_socket(transport);
1940 if (ret && !RPC_IS_SOFTCONN(task))
1941 msleep_interruptible(15000);
176e21ee
CL		 1942}
1943
a564b8f0
MG		 1944#ifdef CONFIG_SUNRPC_SWAP
1945static void xs_set_memalloc(struct rpc_xprt *xprt)
1946{
1947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1948 xprt);
1949
1950 if (xprt->swapper)
1951 sk_set_memalloc(transport->inet);
1952}
1953
1954/**
1955 * xs_swapper - Tag this transport as being used for swap.
1956 * @xprt: transport to tag
1957 * @enable: enable/disable
1958 *
1959 */
1960int xs_swapper(struct rpc_xprt *xprt, int enable)
1961{
1962 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1963 xprt);
1964 int err = 0;
1965
1966 if (enable) {
1967 xprt->swapper++;
1968 xs_set_memalloc(xprt);
1969 } else if (xprt->swapper) {
1970 xprt->swapper--;
1971 sk_clear_memalloc(transport->inet);
1972 }
1973
1974 return err;
1975}
1976EXPORT_SYMBOL_GPL(xs_swapper);
1977#else
1978static void xs_set_memalloc(struct rpc_xprt *xprt)
1979{
1980}
1981#endif
1982
16be2d20
CL		 1983static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1984{
1985 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1986
1987 if (!transport->inet) {
1988 struct sock *sk = sock->sk;
1989
1990 write_lock_bh(&sk->sk_callback_lock);
1991
2a9e1cfa
TM		 1992 xs_save_old_callbacks(transport, sk);
1993
16be2d20 1994 sk->sk_user_data = xprt;
16be2d20
CL		 1995 sk->sk_data_ready = xs_udp_data_ready;
1996 sk->sk_write_space = xs_udp_write_space;
1997 sk->sk_no_check = UDP_CSUM_NORCV;
1998 sk->sk_allocation = GFP_ATOMIC;
1999
2000 xprt_set_connected(xprt);
2001
2002 /* Reset to new socket */
2003 transport->sock = sock;
2004 transport->inet = sk;
2005
a564b8f0
MG		 2006 xs_set_memalloc(xprt);
2007
16be2d20
CL		 2008 write_unlock_bh(&sk->sk_callback_lock);
2009 }
2010 xs_udp_do_set_buffer_size(xprt);
2011}
2012
8c14ff2a 2013static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2014{
34161db6
TM		 2015 struct sock_xprt *transport =
2016 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2017 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2018 struct socket *sock = transport->sock;
b65c0310 2019 int status = -EIO;
9903cd1c 2020
5cf02d09
JL		 2021 current->flags |= PF_FSTRANS;
2022
b0d93ad5 2023 /* Start by resetting any existing state */
fe315e76 2024 xs_reset_transport(transport);
8c14ff2a
PE		 2025 sock = xs_create_sock(xprt, transport,
2026 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2027 if (IS_ERR(sock))
b0d93ad5 2028 goto out;
68e220bd 2029
c740eff8
CL		 2030 dprintk("RPC: worker connecting xprt %p via %s to "
2031 "%s (port %s)\n", xprt,
2032 xprt->address_strings[RPC_DISPLAY_PROTO],
2033 xprt->address_strings[RPC_DISPLAY_ADDR],
2034 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2035
2036 xs_udp_finish_connecting(xprt, sock);
b0d93ad5
CL		 2037 status = 0;
2038out:
b0d93ad5 2039 xprt_clear_connecting(xprt);
7d1e8255 2040 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2041 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2042}
2043
3167e12c
CL		 2044/*
2045 * We need to preserve the port number so the reply cache on the server can
2046 * find our cached RPC replies when we get around to reconnecting.
2047 */
58dddac9 2048static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2049{
2050 int result;
3167e12c
CL		 2051 struct sockaddr any;
2052
58dddac9 2053 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2054
2055 /*
2056 * Disconnect the transport socket by doing a connect operation
2057 * with AF_UNSPEC. This should return immediately...
2058 */
2059 memset(&any, 0, sizeof(any));
2060 any.sa_family = AF_UNSPEC;
ee0ac0c2 2061 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
7d1e8255 2062 if (!result)
4bc1e68e
TM		 2063 xs_sock_reset_connection_flags(&transport->xprt);
2064 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
3167e12c
CL		 2065}
2066
58dddac9 2067static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2068{
2069 unsigned int state = transport->inet->sk_state;
2070
669502ff
AC		 2071 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2072 /* we don't need to abort the connection if the socket
2073 * hasn't undergone a shutdown
2074 */
2075 if (transport->inet->sk_shutdown == 0)
2076 return;
2077 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2078 __func__, transport->inet->sk_shutdown);
2079 }
2080 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2081 /* we don't need to abort the connection if the socket
2082 * hasn't undergone a shutdown
2083 */
2084 if (transport->inet->sk_shutdown == 0)
2085 return;
2086 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2087 "sk_shutdown set to %d\n",
2088 __func__, transport->inet->sk_shutdown);
2089 }
58dddac9 2090 xs_abort_connection(transport);
40d2549d
TM		 2091}
2092
16be2d20 2093static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2094{
16be2d20 2095 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2096 int ret = -ENOTCONN;
edb267a6 2097
ee0ac0c2 2098 if (!transport->inet) {
b0d93ad5
CL		 2099 struct sock *sk = sock->sk;
2100
2101 write_lock_bh(&sk->sk_callback_lock);
2102
2a9e1cfa
TM		 2103 xs_save_old_callbacks(transport, sk);
2104
b0d93ad5 2105 sk->sk_user_data = xprt;
b0d93ad5
CL		 2106 sk->sk_data_ready = xs_tcp_data_ready;
2107 sk->sk_state_change = xs_tcp_state_change;
2108 sk->sk_write_space = xs_tcp_write_space;
b079fa7b 2109 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2110
2111 /* socket options */
2112 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2113 sock_reset_flag(sk, SOCK_LINGER);
2114 tcp_sk(sk)->linger2 = 0;
2115 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2116
2117 xprt_clear_connected(xprt);
2118
2119 /* Reset to new socket */
ee0ac0c2
CL		 2120 transport->sock = sock;
2121 transport->inet = sk;
b0d93ad5
CL		 2122
2123 write_unlock_bh(&sk->sk_callback_lock);
2124 }
2125
01d37c42 2126 if (!xprt_bound(xprt))
fe19a96b 2127 goto out;
01d37c42 2128
a564b8f0
MG		 2129 xs_set_memalloc(xprt);
2130
b0d93ad5 2131 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2132 xprt->stat.connect_count++;
2133 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2134 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2135 switch (ret) {
2136 case 0:
2137 case -EINPROGRESS:
2138 /* SYN_SENT! */
2139 xprt->connect_cookie++;
2140 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2141 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2142 }
2143out:
2144 return ret;
16be2d20
CL		 2145}
2146
9903cd1c 2147/**
b61d59ff
TM		 2148 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2149 * @xprt: RPC transport to connect
2150 * @transport: socket transport to connect
2151 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2152 *
2153 * Invoked by a work queue tasklet.
a246b010 2154 */
cdd518d5 2155static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2156{
cdd518d5
PE		 2157 struct sock_xprt *transport =
2158 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2159 struct socket *sock = transport->sock;
a9f5f0f7 2160 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2161 int status = -EIO;
a246b010 2162
5cf02d09
JL		 2163 current->flags |= PF_FSTRANS;
2164
ee0ac0c2 2165 if (!sock) {
7d1e8255 2166 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2167 sock = xs_create_sock(xprt, transport,
2168 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2169 if (IS_ERR(sock)) {
2170 status = PTR_ERR(sock);
3167e12c
CL		 2171 goto out;
2172 }
7d1e8255
TM		 2173 } else {
2174 int abort_and_exit;
a246b010 2175
7d1e8255
TM		 2176 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2177 &xprt->state);
3167e12c 2178 /* "close" the socket, preserving the local port */
58dddac9 2179 xs_tcp_reuse_connection(transport);
a246b010 2180
7d1e8255
TM		 2181 if (abort_and_exit)
2182 goto out_eagain;
2183 }
a246b010 2184
c740eff8
CL		 2185 dprintk("RPC: worker connecting xprt %p via %s to "
2186 "%s (port %s)\n", xprt,
2187 xprt->address_strings[RPC_DISPLAY_PROTO],
2188 xprt->address_strings[RPC_DISPLAY_ADDR],
2189 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2190
16be2d20 2191 status = xs_tcp_finish_connecting(xprt, sock);
46121cf7
CL		 2192 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2193 xprt, -status, xprt_connected(xprt),
2194 sock->sk->sk_state);
2a491991 2195 switch (status) {
f75e6745
TM		 2196 default:
2197 printk("%s: connect returned unhandled error %d\n",
2198 __func__, status);
2199 case -EADDRNOTAVAIL:
2200 /* We're probably in TIME_WAIT. Get rid of existing socket,
2201 * and retry
2202 */
a519fc7a 2203 xs_tcp_force_close(xprt);
88b5ed73 2204 break;
8a2cec29
TM		 2205 case -ECONNREFUSED:
2206 case -ECONNRESET:
2207 case -ENETUNREACH:
2208 /* retry with existing socket, after a delay */
2a491991
TM		 2209 case 0:
2210 case -EINPROGRESS:
2211 case -EALREADY:
7d1e8255 2212 xprt_clear_connecting(xprt);
5cf02d09 2213 current->flags &= ~PF_FSTRANS;
7d1e8255 2214 return;
9fcfe0c8
TM		 2215 case -EINVAL:
2216 /* Happens, for instance, if the user specified a link
2217 * local IPv6 address without a scope-id.
2218 */
2219 goto out;
a246b010 2220 }
7d1e8255 2221out_eagain:
2a491991 2222 status = -EAGAIN;
a246b010 2223out:
68e220bd 2224 xprt_clear_connecting(xprt);
7d1e8255 2225 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2226 current->flags &= ~PF_FSTRANS;
68e220bd 2227}
b0d93ad5 2228
9903cd1c
CL		 2229/**
2230 * xs_connect - connect a socket to a remote endpoint
1b092092 2231 * @xprt: pointer to transport structure
9903cd1c
CL		 2232 * @task: address of RPC task that manages state of connect request
2233 *
2234 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2235 *
2236 * UDP socket connects are synchronous, but we use a work queue anyway
2237 * to guarantee that even unprivileged user processes can set up a
2238 * socket on a privileged port.
2239 *
2240 * If a UDP socket connect fails, the delay behavior here prevents
2241 * retry floods (hard mounts).
9903cd1c 2242 */
1b092092 2243static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2244{
ee0ac0c2 2245 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2246
09a21c41 2247 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2248 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2249 "seconds\n",
03bf4b70 2250 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2251 queue_delayed_work(rpciod_workqueue,
2252 &transport->connect_worker,
2253 xprt->reestablish_timeout);
03bf4b70 2254 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2255 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2256 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2257 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2258 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2259 } else {
46121cf7 2260 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2261 queue_delayed_work(rpciod_workqueue,
2262 &transport->connect_worker, 0);
a246b010
CL		 2263 }
2264}
2265
176e21ee
CL		 2266/**
2267 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2268 * @xprt: rpc_xprt struct containing statistics
2269 * @seq: output file
2270 *
2271 */
2272static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2273{
2274 long idle_time = 0;
2275
2276 if (xprt_connected(xprt))
2277 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2278
2279 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2280 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2281 xprt->stat.bind_count,
2282 xprt->stat.connect_count,
2283 xprt->stat.connect_time,
2284 idle_time,
2285 xprt->stat.sends,
2286 xprt->stat.recvs,
2287 xprt->stat.bad_xids,
2288 xprt->stat.req_u,
15a45206
AA		 2289 xprt->stat.bklog_u,
2290 xprt->stat.max_slots,
2291 xprt->stat.sending_u,
2292 xprt->stat.pending_u);
176e21ee
CL		 2293}
2294
262ca07d
CL		 2295/**
2296 * xs_udp_print_stats - display UDP socket-specifc stats
2297 * @xprt: rpc_xprt struct containing statistics
2298 * @seq: output file
2299 *
2300 */
2301static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2302{
c8475461
CL		 2303 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2304
15a45206
AA		 2305 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2306 "%lu %llu %llu\n",
fbfffbd5 2307 transport->srcport,
262ca07d
CL		 2308 xprt->stat.bind_count,
2309 xprt->stat.sends,
2310 xprt->stat.recvs,
2311 xprt->stat.bad_xids,
2312 xprt->stat.req_u,
15a45206
AA		 2313 xprt->stat.bklog_u,
2314 xprt->stat.max_slots,
2315 xprt->stat.sending_u,
2316 xprt->stat.pending_u);
262ca07d
CL		 2317}
2318
2319/**
2320 * xs_tcp_print_stats - display TCP socket-specifc stats
2321 * @xprt: rpc_xprt struct containing statistics
2322 * @seq: output file
2323 *
2324 */
2325static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2326{
c8475461 2327 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2328 long idle_time = 0;
2329
2330 if (xprt_connected(xprt))
2331 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2332
15a45206
AA		 2333 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2334 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2335 transport->srcport,
262ca07d
CL		 2336 xprt->stat.bind_count,
2337 xprt->stat.connect_count,
2338 xprt->stat.connect_time,
2339 idle_time,
2340 xprt->stat.sends,
2341 xprt->stat.recvs,
2342 xprt->stat.bad_xids,
2343 xprt->stat.req_u,
15a45206
AA		 2344 xprt->stat.bklog_u,
2345 xprt->stat.max_slots,
2346 xprt->stat.sending_u,
2347 xprt->stat.pending_u);
262ca07d
CL		 2348}
2349
4cfc7e60
RI		 2350/*
2351 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2352 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2353 * to use the server side send routines.
2354 */
5a51f13a 2355static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2356{
2357 struct page *page;
2358 struct rpc_buffer *buf;
2359
b8a13d03
WAA		 2360 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2361 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2362 return NULL;
4cfc7e60 2363
b8a13d03 2364 page = alloc_page(GFP_KERNEL);
4cfc7e60
RI		 2365 if (!page)
2366 return NULL;
2367
2368 buf = page_address(page);
2369 buf->len = PAGE_SIZE;
2370
2371 return buf->data;
2372}
2373
2374/*
2375 * Free the space allocated in the bc_alloc routine
2376 */
5a51f13a 2377static void bc_free(void *buffer)
4cfc7e60
RI		 2378{
2379 struct rpc_buffer *buf;
2380
2381 if (!buffer)
2382 return;
2383
2384 buf = container_of(buffer, struct rpc_buffer, data);
2385 free_page((unsigned long)buf);
2386}
2387
2388/*
2389 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2390 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2391 */
2392static int bc_sendto(struct rpc_rqst *req)
2393{
2394 int len;
2395 struct xdr_buf *xbufp = &req->rq_snd_buf;
2396 struct rpc_xprt *xprt = req->rq_xprt;
2397 struct sock_xprt *transport =
2398 container_of(xprt, struct sock_xprt, xprt);
2399 struct socket *sock = transport->sock;
2400 unsigned long headoff;
2401 unsigned long tailoff;
2402
61677eee 2403 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2404
2405 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2406 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2407 len = svc_send_common(sock, xbufp,
2408 virt_to_page(xbufp->head[0].iov_base), headoff,
2409 xbufp->tail[0].iov_base, tailoff);
2410
2411 if (len != xbufp->len) {
2412 printk(KERN_NOTICE "Error sending entire callback!\n");
2413 len = -EAGAIN;
2414 }
2415
2416 return len;
2417}
2418
2419/*
2420 * The send routine. Borrows from svc_send
2421 */
2422static int bc_send_request(struct rpc_task *task)
2423{
2424 struct rpc_rqst *req = task->tk_rqstp;
2425 struct svc_xprt *xprt;
4cfc7e60
RI		 2426 u32 len;
2427
2428 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2429 /*
2430 * Get the server socket associated with this callback xprt
2431 */
2432 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2433
2434 /*
2435 * Grab the mutex to serialize data as the connection is shared
2436 * with the fore channel
2437 */
2438 if (!mutex_trylock(&xprt->xpt_mutex)) {
2439 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2440 if (!mutex_trylock(&xprt->xpt_mutex))
2441 return -EAGAIN;
2442 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2443 }
2444 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2445 len = -ENOTCONN;
2446 else
2447 len = bc_sendto(req);
2448 mutex_unlock(&xprt->xpt_mutex);
2449
2450 if (len > 0)
2451 len = 0;
2452
2453 return len;
2454}
2455
2456/*
2457 * The close routine. Since this is client initiated, we do nothing
2458 */
2459
2460static void bc_close(struct rpc_xprt *xprt)
2461{
4cfc7e60
RI		 2462}
2463
2464/*
2465 * The xprt destroy routine. Again, because this connection is client
2466 * initiated, we do nothing
2467 */
2468
2469static void bc_destroy(struct rpc_xprt *xprt)
2470{
4cfc7e60
RI		 2471}
2472
176e21ee
CL		 2473static struct rpc_xprt_ops xs_local_ops = {
2474 .reserve_xprt = xprt_reserve_xprt,
2475 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2476 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2477 .rpcbind = xs_local_rpcbind,
2478 .set_port = xs_local_set_port,
dc107402 2479 .connect = xs_local_connect,
176e21ee
CL		 2480 .buf_alloc = rpc_malloc,
2481 .buf_free = rpc_free,
2482 .send_request = xs_local_send_request,
2483 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2484 .close = xs_close,
2485 .destroy = xs_destroy,
2486 .print_stats = xs_local_print_stats,
2487};
2488
262965f5 2489static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2490 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2491 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2492 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2493 .alloc_slot = xprt_alloc_slot,
45160d62 2494 .rpcbind = rpcb_getport_async,
92200412 2495 .set_port = xs_set_port,
262965f5 2496 .connect = xs_connect,
02107148
CL		 2497 .buf_alloc = rpc_malloc,
2498 .buf_free = rpc_free,
262965f5 2499 .send_request = xs_udp_send_request,
fe3aca29 2500 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2501 .timer = xs_udp_timer,
a58dd398 2502 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2503 .close = xs_close,
2504 .destroy = xs_destroy,
262ca07d 2505 .print_stats = xs_udp_print_stats,
262965f5
CL		 2506};
2507
2508static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2509 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2510 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2511 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2512 .rpcbind = rpcb_getport_async,
92200412 2513 .set_port = xs_set_port,
0b9e7943 2514 .connect = xs_connect,
02107148
CL		 2515 .buf_alloc = rpc_malloc,
2516 .buf_free = rpc_free,
262965f5 2517 .send_request = xs_tcp_send_request,
fe3aca29 2518 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2519 .close = xs_tcp_close,
9903cd1c 2520 .destroy = xs_destroy,
262ca07d 2521 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2522};
2523
4cfc7e60
RI		 2524/*
2525 * The rpc_xprt_ops for the server backchannel
2526 */
2527
2528static struct rpc_xprt_ops bc_tcp_ops = {
2529 .reserve_xprt = xprt_reserve_xprt,
2530 .release_xprt = xprt_release_xprt,
84e28a30 2531 .alloc_slot = xprt_alloc_slot,
92769108 2532 .rpcbind = xs_local_rpcbind,
4cfc7e60
RI		 2533 .buf_alloc = bc_malloc,
2534 .buf_free = bc_free,
2535 .send_request = bc_send_request,
2536 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2537 .close = bc_close,
2538 .destroy = bc_destroy,
2539 .print_stats = xs_tcp_print_stats,
2540};
2541
92476850
CL		 2542static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2543{
2544 static const struct sockaddr_in sin = {
2545 .sin_family = AF_INET,
2546 .sin_addr.s_addr = htonl(INADDR_ANY),
2547 };
2548 static const struct sockaddr_in6 sin6 = {
2549 .sin6_family = AF_INET6,
2550 .sin6_addr = IN6ADDR_ANY_INIT,
2551 };
2552
2553 switch (family) {
176e21ee
CL		 2554 case AF_LOCAL:
2555 break;
92476850
CL		 2556 case AF_INET:
2557 memcpy(sap, &sin, sizeof(sin));
2558 break;
2559 case AF_INET6:
2560 memcpy(sap, &sin6, sizeof(sin6));
2561 break;
2562 default:
2563 dprintk("RPC: %s: Bad address family\n", __func__);
2564 return -EAFNOSUPPORT;
2565 }
2566 return 0;
2567}
2568
3c341b0b 2569static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2570 unsigned int slot_table_size,
2571 unsigned int max_slot_table_size)
c8541ecd
CL		 2572{
2573 struct rpc_xprt *xprt;
ffc2e518 2574 struct sock_xprt *new;
c8541ecd 2575
96802a09 2576 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2577 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2578 return ERR_PTR(-EBADF);
2579 }
2580
d9ba131d
TM		 2581 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2582 max_slot_table_size);
bd1722d4 2583 if (xprt == NULL) {
46121cf7
CL		 2584 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2585 "rpc_xprt\n");
c8541ecd
CL		 2586 return ERR_PTR(-ENOMEM);
2587 }
c8541ecd 2588
bd1722d4 2589 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2590 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2591 xprt->addrlen = args->addrlen;
d3bc9a1d 2592 if (args->srcaddr)
fbfffbd5 2593 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2594 else {
2595 int err;
2596 err = xs_init_anyaddr(args->dstaddr->sa_family,
2597 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2598 if (err != 0) {
2599 xprt_free(xprt);
92476850 2600 return ERR_PTR(err);
2aa13531 2601 }
92476850 2602 }
c8541ecd
CL		 2603
2604 return xprt;
2605}
2606
176e21ee
CL		 2607static const struct rpc_timeout xs_local_default_timeout = {
2608 .to_initval = 10 * HZ,
2609 .to_maxval = 10 * HZ,
2610 .to_retries = 2,
2611};
2612
2613/**
2614 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2615 * @args: rpc transport creation arguments
2616 *
2617 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2618 */
2619static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2620{
2621 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2622 struct sock_xprt *transport;
2623 struct rpc_xprt *xprt;
2624 struct rpc_xprt *ret;
2625
d9ba131d
TM		 2626 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2627 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2628 if (IS_ERR(xprt))
2629 return xprt;
2630 transport = container_of(xprt, struct sock_xprt, xprt);
2631
2632 xprt->prot = 0;
2633 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2634 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2635
2636 xprt->bind_timeout = XS_BIND_TO;
2637 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2638 xprt->idle_timeout = XS_IDLE_DISC_TO;
2639
2640 xprt->ops = &xs_local_ops;
2641 xprt->timeout = &xs_local_default_timeout;
2642
2643 switch (sun->sun_family) {
2644 case AF_LOCAL:
2645 if (sun->sun_path[0] != '/') {
2646 dprintk("RPC: bad AF_LOCAL address: %s\n",
2647 sun->sun_path);
2648 ret = ERR_PTR(-EINVAL);
2649 goto out_err;
2650 }
2651 xprt_set_bound(xprt);
176e21ee
CL		 2652 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2653 break;
2654 default:
2655 ret = ERR_PTR(-EAFNOSUPPORT);
2656 goto out_err;
2657 }
2658
2659 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2660 xprt->address_strings[RPC_DISPLAY_ADDR]);
2661
2662 if (try_module_get(THIS_MODULE))
2663 return xprt;
2664 ret = ERR_PTR(-EINVAL);
2665out_err:
2666 xprt_free(xprt);
2667 return ret;
2668}
2669
2881ae74
TM		 2670static const struct rpc_timeout xs_udp_default_timeout = {
2671 .to_initval = 5 * HZ,
2672 .to_maxval = 30 * HZ,
2673 .to_increment = 5 * HZ,
2674 .to_retries = 5,
2675};
2676
9903cd1c
CL		 2677/**
2678 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2679 * @args: rpc transport creation arguments
9903cd1c
CL		 2680 *
2681 */
483066d6 2682static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2683{
8f9d5b1a 2684 struct sockaddr *addr = args->dstaddr;
c8541ecd 2685 struct rpc_xprt *xprt;
c8475461 2686 struct sock_xprt *transport;
0a68b0be 2687 struct rpc_xprt *ret;
a246b010 2688
d9ba131d
TM		 2689 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2690 xprt_udp_slot_table_entries);
c8541ecd
CL		 2691 if (IS_ERR(xprt))
2692 return xprt;
c8475461 2693 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2694
ec739ef0 2695 xprt->prot = IPPROTO_UDP;
808012fb 2696 xprt->tsh_size = 0;
a246b010
CL		 2697 /* XXX: header size can vary due to auth type, IPv6, etc. */
2698 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2699
03bf4b70 2700 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2701 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2702 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2703
262965f5 2704 xprt->ops = &xs_udp_ops;
a246b010 2705
ba7392bb 2706 xprt->timeout = &xs_udp_default_timeout;
a246b010 2707
8f9d5b1a
CL		 2708 switch (addr->sa_family) {
2709 case AF_INET:
2710 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2711 xprt_set_bound(xprt);
2712
2713 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2714 xs_udp_setup_socket);
9dc3b095 2715 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2716 break;
2717 case AF_INET6:
2718 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2719 xprt_set_bound(xprt);
2720
2721 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2722 xs_udp_setup_socket);
9dc3b095 2723 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2724 break;
2725 default:
0a68b0be
BF		 2726 ret = ERR_PTR(-EAFNOSUPPORT);
2727 goto out_err;
8f9d5b1a
CL		 2728 }
2729
c740eff8
CL		 2730 if (xprt_bound(xprt))
2731 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2732 xprt->address_strings[RPC_DISPLAY_ADDR],
2733 xprt->address_strings[RPC_DISPLAY_PORT],
2734 xprt->address_strings[RPC_DISPLAY_PROTO]);
2735 else
2736 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2737 xprt->address_strings[RPC_DISPLAY_ADDR],
2738 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2739
bc25571e
TT		 2740 if (try_module_get(THIS_MODULE))
2741 return xprt;
0a68b0be
BF		 2742 ret = ERR_PTR(-EINVAL);
2743out_err:
e204e621 2744 xprt_free(xprt);
0a68b0be 2745 return ret;
a246b010
CL		 2746}
2747
2881ae74
TM		 2748static const struct rpc_timeout xs_tcp_default_timeout = {
2749 .to_initval = 60 * HZ,
2750 .to_maxval = 60 * HZ,
2751 .to_retries = 2,
2752};
2753
9903cd1c
CL		 2754/**
2755 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2756 * @args: rpc transport creation arguments
9903cd1c
CL		 2757 *
2758 */
483066d6 2759static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2760{
8f9d5b1a 2761 struct sockaddr *addr = args->dstaddr;
c8541ecd 2762 struct rpc_xprt *xprt;
c8475461 2763 struct sock_xprt *transport;
0a68b0be 2764 struct rpc_xprt *ret;
a246b010 2765
d9ba131d
TM		 2766 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2767 xprt_max_tcp_slot_table_entries);
c8541ecd
CL		 2768 if (IS_ERR(xprt))
2769 return xprt;
c8475461 2770 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2771
ec739ef0 2772 xprt->prot = IPPROTO_TCP;
808012fb 2773 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2774 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2775
03bf4b70 2776 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2777 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2778 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2779
262965f5 2780 xprt->ops = &xs_tcp_ops;
ba7392bb 2781 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2782
8f9d5b1a
CL		 2783 switch (addr->sa_family) {
2784 case AF_INET:
2785 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2786 xprt_set_bound(xprt);
2787
9dc3b095 2788 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2789 xs_tcp_setup_socket);
9dc3b095 2790 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2791 break;
2792 case AF_INET6:
2793 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2794 xprt_set_bound(xprt);
2795
9dc3b095 2796 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2797 xs_tcp_setup_socket);
9dc3b095 2798 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2799 break;
2800 default:
0a68b0be
BF		 2801 ret = ERR_PTR(-EAFNOSUPPORT);
2802 goto out_err;
8f9d5b1a
CL		 2803 }
2804
c740eff8
CL		 2805 if (xprt_bound(xprt))
2806 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2807 xprt->address_strings[RPC_DISPLAY_ADDR],
2808 xprt->address_strings[RPC_DISPLAY_PORT],
2809 xprt->address_strings[RPC_DISPLAY_PROTO]);
2810 else
2811 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2812 xprt->address_strings[RPC_DISPLAY_ADDR],
2813 xprt->address_strings[RPC_DISPLAY_PROTO]);
2814
edb267a6 2815
bc25571e
TT		 2816 if (try_module_get(THIS_MODULE))
2817 return xprt;
0a68b0be
BF		 2818 ret = ERR_PTR(-EINVAL);
2819out_err:
e204e621 2820 xprt_free(xprt);
0a68b0be 2821 return ret;
a246b010 2822}
282b32e1 2823
f300baba
AB		 2824/**
2825 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2826 * @args: rpc transport creation arguments
2827 *
2828 */
2829static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2830{
2831 struct sockaddr *addr = args->dstaddr;
2832 struct rpc_xprt *xprt;
2833 struct sock_xprt *transport;
2834 struct svc_sock *bc_sock;
0a68b0be 2835 struct rpc_xprt *ret;
f300baba 2836
f0418aa4
BF		 2837 if (args->bc_xprt->xpt_bc_xprt) {
2838 /*
2839 * This server connection already has a backchannel
2840 * export; we can't create a new one, as we wouldn't be
2841 * able to match replies based on xid any more. So,
2842 * reuse the already-existing one:
2843 */
2844 return args->bc_xprt->xpt_bc_xprt;
2845 }
d9ba131d
TM		 2846 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2847 xprt_tcp_slot_table_entries);
f300baba
AB		 2848 if (IS_ERR(xprt))
2849 return xprt;
2850 transport = container_of(xprt, struct sock_xprt, xprt);
2851
2852 xprt->prot = IPPROTO_TCP;
2853 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2854 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2855 xprt->timeout = &xs_tcp_default_timeout;
2856
2857 /* backchannel */
2858 xprt_set_bound(xprt);
2859 xprt->bind_timeout = 0;
f300baba
AB		 2860 xprt->reestablish_timeout = 0;
2861 xprt->idle_timeout = 0;
2862
f300baba
AB		 2863 xprt->ops = &bc_tcp_ops;
2864
2865 switch (addr->sa_family) {
2866 case AF_INET:
2867 xs_format_peer_addresses(xprt, "tcp",
2868 RPCBIND_NETID_TCP);
2869 break;
2870 case AF_INET6:
2871 xs_format_peer_addresses(xprt, "tcp",
2872 RPCBIND_NETID_TCP6);
2873 break;
2874 default:
0a68b0be
BF		 2875 ret = ERR_PTR(-EAFNOSUPPORT);
2876 goto out_err;
f300baba
AB		 2877 }
2878
50fa0d40
PE		 2879 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2880 xprt->address_strings[RPC_DISPLAY_ADDR],
2881 xprt->address_strings[RPC_DISPLAY_PORT],
2882 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2883
99de8ea9
BF		 2884 /*
2885 * Once we've associated a backchannel xprt with a connection,
2886 * we want to keep it around as long as long as the connection
2887 * lasts, in case we need to start using it for a backchannel
2888 * again; this reference won't be dropped until bc_xprt is
2889 * destroyed.
2890 */
2891 xprt_get(xprt);
2892 args->bc_xprt->xpt_bc_xprt = xprt;
2893 xprt->bc_xprt = args->bc_xprt;
2894 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2895 transport->sock = bc_sock->sk_sock;
2896 transport->inet = bc_sock->sk_sk;
2897
f300baba
AB		 2898 /*
2899 * Since we don't want connections for the backchannel, we set
2900 * the xprt status to connected
2901 */
2902 xprt_set_connected(xprt);
2903
2904
2905 if (try_module_get(THIS_MODULE))
2906 return xprt;
99de8ea9 2907 xprt_put(xprt);
0a68b0be
BF		 2908 ret = ERR_PTR(-EINVAL);
2909out_err:
e204e621 2910 xprt_free(xprt);
0a68b0be 2911 return ret;
f300baba
AB		 2912}
2913
176e21ee
CL		 2914static struct xprt_class xs_local_transport = {
2915 .list = LIST_HEAD_INIT(xs_local_transport.list),
2916 .name = "named UNIX socket",
2917 .owner = THIS_MODULE,
2918 .ident = XPRT_TRANSPORT_LOCAL,
2919 .setup = xs_setup_local,
2920};
2921
bc25571e
TT		 2922static struct xprt_class xs_udp_transport = {
2923 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2924 .name = "udp",
2925 .owner = THIS_MODULE,
f300baba 2926 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2927 .setup = xs_setup_udp,
2928};
2929
2930static struct xprt_class xs_tcp_transport = {
2931 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2932 .name = "tcp",
2933 .owner = THIS_MODULE,
f300baba 2934 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2935 .setup = xs_setup_tcp,
2936};
2937
f300baba
AB		 2938static struct xprt_class xs_bc_tcp_transport = {
2939 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2940 .name = "tcp NFSv4.1 backchannel",
2941 .owner = THIS_MODULE,
2942 .ident = XPRT_TRANSPORT_BC_TCP,
2943 .setup = xs_setup_bc_tcp,
2944};
2945
282b32e1 2946/**
bc25571e 2947 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2948 *
2949 */
2950int init_socket_xprt(void)
2951{
fbf76683 2952#ifdef RPC_DEBUG
2b1bec5f 2953 if (!sunrpc_table_header)
0b4d4147 2954 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2955#endif
2956
176e21ee 2957 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 2958 xprt_register_transport(&xs_udp_transport);
2959 xprt_register_transport(&xs_tcp_transport);
f300baba 2960 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 2961
282b32e1
CL		 2962 return 0;
2963}
2964
2965/**
bc25571e 2966 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 2967 *
2968 */
2969void cleanup_socket_xprt(void)
2970{
fbf76683
CL		 2971#ifdef RPC_DEBUG
2972 if (sunrpc_table_header) {
2973 unregister_sysctl_table(sunrpc_table_header);
2974 sunrpc_table_header = NULL;
2975 }
2976#endif
bc25571e 2977
176e21ee 2978 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 2979 xprt_unregister_transport(&xs_udp_transport);
2980 xprt_unregister_transport(&xs_tcp_transport);
f300baba 2981 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 2982}
cbf11071 2983
9bbb9e5a
RR		 2984static int param_set_uint_minmax(const char *val,
2985 const struct kernel_param *kp,
cbf11071
TM		 2986 unsigned int min, unsigned int max)
2987{
2988 unsigned long num;
2989 int ret;
2990
2991 if (!val)
2992 return -EINVAL;
2993 ret = strict_strtoul(val, 0, &num);
2994 if (ret == -EINVAL || num < min || num > max)
2995 return -EINVAL;
2996 *((unsigned int *)kp->arg) = num;
2997 return 0;
2998}
2999
9bbb9e5a 3000static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 3001{
3002 return param_set_uint_minmax(val, kp,
3003 RPC_MIN_RESVPORT,
3004 RPC_MAX_RESVPORT);
3005}
3006
9bbb9e5a
RR		 3007static struct kernel_param_ops param_ops_portnr = {
3008 .set = param_set_portnr,
3009 .get = param_get_uint,
3010};
3011
cbf11071
TM		 3012#define param_check_portnr(name, p) \
3013 __param_check(name, p, unsigned int);
3014
3015module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3016module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3017
9bbb9e5a
RR		 3018static int param_set_slot_table_size(const char *val,
3019 const struct kernel_param *kp)
cbf11071
TM		 3020{
3021 return param_set_uint_minmax(val, kp,
3022 RPC_MIN_SLOT_TABLE,
3023 RPC_MAX_SLOT_TABLE);
3024}
3025
9bbb9e5a
RR		 3026static struct kernel_param_ops param_ops_slot_table_size = {
3027 .set = param_set_slot_table_size,
3028 .get = param_get_uint,
3029};
3030
cbf11071
TM		 3031#define param_check_slot_table_size(name, p) \
3032 __param_check(name, p, unsigned int);
3033
d9ba131d
TM		 3034static int param_set_max_slot_table_size(const char *val,
3035 const struct kernel_param *kp)
3036{
3037 return param_set_uint_minmax(val, kp,
3038 RPC_MIN_SLOT_TABLE,
3039 RPC_MAX_SLOT_TABLE_LIMIT);
3040}
3041
3042static struct kernel_param_ops param_ops_max_slot_table_size = {
3043 .set = param_set_max_slot_table_size,
3044 .get = param_get_uint,
3045};
3046
3047#define param_check_max_slot_table_size(name, p) \
3048 __param_check(name, p, unsigned int);
3049
cbf11071
TM		 3050module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3051 slot_table_size, 0644);
d9ba131d
TM		 3052module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3053 max_slot_table_size, 0644);
cbf11071
TM		 3054module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3055 slot_table_size, 0644);
3056
Ubuntu Artful kernel mirror