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Merge tag 'nfs-rdma-for-3.20-part-2' of git://git.linux-nfs.org/projects/anna/nfs...
[deliverable/linux.git] / net / sunrpc / xprtsock.c
CommitLineData
a246b010
CL		 1/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
113aa838
AC		 6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
a246b010
CL		 8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
55aa4f58
CL		 14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
8f9d5b1a
CL		 16 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
a246b010
CL		 19 */
20
21#include <linux/types.h>
176e21ee 22#include <linux/string.h>
a246b010 23#include <linux/slab.h>
bc25571e 24#include <linux/module.h>
a246b010 25#include <linux/capability.h>
a246b010
CL		 26#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
176e21ee 32#include <linux/un.h>
a246b010
CL		 33#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
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
40b5ea0c
TM		 50#include <trace/events/sunrpc.h>
51
4cfc7e60 52#include "sunrpc.h"
176e21ee
CL		 53
54static void xs_close(struct rpc_xprt *xprt);
55
c556b754
CL		 56/*
57 * xprtsock tunables
58 */
09acfea5
TM		 59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
c556b754 62
09acfea5
TM		 63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
c556b754 65
7d1e8255 66#define XS_TCP_LINGER_TO (15U * HZ)
25fe6142 67static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
7d1e8255 68
fbf76683
CL		 69/*
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
73 *
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
76 */
77
f895b252 78#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
fbf76683
CL		 79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
d9ba131d 82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
fbf76683
CL		 83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
fe2c6338 92static struct ctl_table xs_tunables_table[] = {
fbf76683 93 {
fbf76683
CL		 94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
6d456111 98 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
fbf76683
CL		 103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
6d456111 107 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
d9ba131d
TM		 111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
fbf76683 120 {
fbf76683
CL		 121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
6d456111 125 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
fbf76683
CL		 130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
6d456111 134 .proc_handler = proc_dointvec_minmax,
fbf76683
CL		 135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
25fe6142
TM		 138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
6d456111 143 .proc_handler = proc_dointvec_jiffies,
fbf76683 144 },
f8572d8f 145 { },
fbf76683
CL		 146};
147
fe2c6338 148static struct ctl_table sunrpc_table[] = {
fbf76683 149 {
fbf76683
CL		 150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
f8572d8f 154 { },
fbf76683
CL		 155};
156
157#endif
158
03bf4b70
CL		 159/*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
f895b252 189#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
a246b010 190# undef RPC_DEBUG_DATA
9903cd1c 191# define RPCDBG_FACILITY RPCDBG_TRANS
a246b010
CL		 192#endif
193
a246b010 194#ifdef RPC_DEBUG_DATA
9903cd1c 195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010 196{
9903cd1c
CL		 197 u8 *buf = (u8 *) packet;
198 int j;
a246b010 199
46121cf7 200 dprintk("RPC: %s\n", msg);
a246b010
CL		 201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
9903cd1c 213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
a246b010
CL		 214{
215 /* NOP */
216}
217#endif
218
2118071d
TM		 219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220{
221 return (struct rpc_xprt *) sk->sk_user_data;
222}
223
95392c59
CL		 224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225{
226 return (struct sockaddr *) &xprt->addr;
227}
228
176e21ee
CL		 229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230{
231 return (struct sockaddr_un *) &xprt->addr;
232}
233
95392c59 234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 235{
95392c59
CL		 236 return (struct sockaddr_in *) &xprt->addr;
237}
238
239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_in6 *) &xprt->addr;
242}
243
c877b849 244static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 245{
c877b849 246 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 247 struct sockaddr_in6 *sin6;
248 struct sockaddr_in *sin;
176e21ee 249 struct sockaddr_un *sun;
c877b849 250 char buf[128];
edb267a6 251
9dc3b095 252 switch (sap->sa_family) {
176e21ee
CL		 253 case AF_LOCAL:
254 sun = xs_addr_un(xprt);
255 strlcpy(buf, sun->sun_path, sizeof(buf));
256 xprt->address_strings[RPC_DISPLAY_ADDR] =
257 kstrdup(buf, GFP_KERNEL);
258 break;
9dc3b095 259 case AF_INET:
176e21ee
CL		 260 (void)rpc_ntop(sap, buf, sizeof(buf));
261 xprt->address_strings[RPC_DISPLAY_ADDR] =
262 kstrdup(buf, GFP_KERNEL);
9dc3b095 263 sin = xs_addr_in(xprt);
fc0b5791 264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 265 break;
266 case AF_INET6:
176e21ee
CL		 267 (void)rpc_ntop(sap, buf, sizeof(buf));
268 xprt->address_strings[RPC_DISPLAY_ADDR] =
269 kstrdup(buf, GFP_KERNEL);
9dc3b095 270 sin6 = xs_addr_in6(xprt);
fc0b5791 271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 272 break;
273 default:
274 BUG();
756805e7 275 }
176e21ee 276
9dc3b095 277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 278}
279
9dc3b095 280static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 281{
9dc3b095
CL		 282 struct sockaddr *sap = xs_addr(xprt);
283 char buf[128];
4b6473fb 284
81160e66 285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 287
81160e66 288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
290}
4b6473fb 291
9dc3b095
CL		 292static void xs_format_peer_addresses(struct rpc_xprt *xprt,
293 const char *protocol,
294 const char *netid)
c877b849 295{
b454ae90 296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 297 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 298 xs_format_common_peer_addresses(xprt);
9dc3b095 299 xs_format_common_peer_ports(xprt);
edb267a6 300}
4b6473fb 301
9dc3b095 302static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 303{
9dc3b095
CL		 304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 306
9dc3b095 307 xs_format_common_peer_ports(xprt);
edb267a6
CL		 308}
309
310static void xs_free_peer_addresses(struct rpc_xprt *xprt)
311{
33e01dc7
CL		 312 unsigned int i;
313
314 for (i = 0; i < RPC_DISPLAY_MAX; i++)
315 switch (i) {
316 case RPC_DISPLAY_PROTO:
317 case RPC_DISPLAY_NETID:
318 continue;
319 default:
320 kfree(xprt->address_strings[i]);
321 }
edb267a6
CL		 322}
323
b4b5cc85
CL		 324#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
325
24c5684b 326static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 327{
b4b5cc85
CL		 328 struct msghdr msg = {
329 .msg_name = addr,
330 .msg_namelen = addrlen,
24c5684b
TM		 331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
332 };
333 struct kvec iov = {
334 .iov_base = vec->iov_base + base,
335 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 336 };
337
24c5684b 338 if (iov.iov_len != 0)
b4b5cc85
CL		 339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
340 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
341}
342
f279cd00 343static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
b4b5cc85 344{
a6b31d18
TM		 345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
346 int offset, size_t size, int flags);
24c5684b
TM		 347 struct page **ppage;
348 unsigned int remainder;
f279cd00 349 int err;
24c5684b
TM		 350
351 remainder = xdr->page_len - base;
352 base += xdr->page_base;
353 ppage = xdr->pages + (base >> PAGE_SHIFT);
354 base &= ~PAGE_MASK;
a6b31d18
TM		 355 do_sendpage = sock->ops->sendpage;
356 if (!zerocopy)
357 do_sendpage = sock_no_sendpage;
24c5684b
TM		 358 for(;;) {
359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
360 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 361
24c5684b
TM		 362 remainder -= len;
363 if (remainder != 0 || more)
364 flags |= MSG_MORE;
a6b31d18 365 err = do_sendpage(sock, *ppage, base, len, flags);
24c5684b
TM		 366 if (remainder == 0 || err != len)
367 break;
f279cd00 368 *sent_p += err;
24c5684b
TM		 369 ppage++;
370 base = 0;
371 }
f279cd00
JB		 372 if (err > 0) {
373 *sent_p += err;
374 err = 0;
375 }
376 return err;
b4b5cc85
CL		 377}
378
9903cd1c
CL		 379/**
380 * xs_sendpages - write pages directly to a socket
381 * @sock: socket to send on
382 * @addr: UDP only -- address of destination
383 * @addrlen: UDP only -- length of destination address
384 * @xdr: buffer containing this request
385 * @base: starting position in the buffer
a6b31d18 386 * @zerocopy: true if it is safe to use sendpage()
f279cd00 387 * @sent_p: return the total number of bytes successfully queued for sending
9903cd1c 388 *
a246b010 389 */
f279cd00 390static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
a246b010 391{
24c5684b 392 unsigned int remainder = xdr->len - base;
f279cd00
JB		 393 int err = 0;
394 int sent = 0;
a246b010 395
262965f5 396 if (unlikely(!sock))
fba91afb 397 return -ENOTSOCK;
262965f5
CL		 398
399 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 400 if (base != 0) {
401 addr = NULL;
402 addrlen = 0;
403 }
262965f5 404
24c5684b
TM		 405 if (base < xdr->head[0].iov_len || addr != NULL) {
406 unsigned int len = xdr->head[0].iov_len - base;
407 remainder -= len;
408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
409 if (remainder == 0 || err != len)
a246b010 410 goto out;
f279cd00 411 *sent_p += err;
a246b010
CL		 412 base = 0;
413 } else
24c5684b 414 base -= xdr->head[0].iov_len;
a246b010 415
24c5684b
TM		 416 if (base < xdr->page_len) {
417 unsigned int len = xdr->page_len - base;
418 remainder -= len;
f279cd00
JB		 419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
420 *sent_p += sent;
421 if (remainder == 0 || sent != len)
a246b010
CL		 422 goto out;
423 base = 0;
24c5684b
TM		 424 } else
425 base -= xdr->page_len;
426
427 if (base >= xdr->tail[0].iov_len)
f279cd00 428 return 0;
24c5684b 429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 430out:
f279cd00
JB		 431 if (err > 0) {
432 *sent_p += err;
433 err = 0;
434 }
435 return err;
a246b010
CL		 436}
437
b6ddf64f
TM		 438static void xs_nospace_callback(struct rpc_task *task)
439{
440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
441
442 transport->inet->sk_write_pending--;
443 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
444}
445
9903cd1c 446/**
262965f5
CL		 447 * xs_nospace - place task on wait queue if transmit was incomplete
448 * @task: task to put to sleep
9903cd1c 449 *
a246b010 450 */
5e3771ce 451static int xs_nospace(struct rpc_task *task)
a246b010 452{
262965f5
CL		 453 struct rpc_rqst *req = task->tk_rqstp;
454 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
06ea0bfe 456 struct sock *sk = transport->inet;
24ca9a84 457 int ret = -EAGAIN;
a246b010 458
46121cf7 459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 460 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
461 req->rq_slen);
462
b6ddf64f
TM		 463 /* Protect against races with write_space */
464 spin_lock_bh(&xprt->transport_lock);
465
466 /* Don't race with disconnect */
467 if (xprt_connected(xprt)) {
468 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
469 /*
470 * Notify TCP that we're limited by the application
471 * window size
472 */
473 set_bit(SOCK_NOSPACE, &transport->sock->flags);
06ea0bfe 474 sk->sk_write_pending++;
b6ddf64f
TM		 475 /* ...and wait for more buffer space */
476 xprt_wait_for_buffer_space(task, xs_nospace_callback);
477 }
478 } else {
479 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 480 ret = -ENOTCONN;
b6ddf64f 481 }
262965f5 482
b6ddf64f 483 spin_unlock_bh(&xprt->transport_lock);
06ea0bfe
TM		 484
485 /* Race breaker in case memory is freed before above code is called */
486 sk->sk_write_space(sk);
5e3771ce 487 return ret;
262965f5
CL		 488}
489
61677eee
CL		 490/*
491 * Construct a stream transport record marker in @buf.
492 */
493static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
494{
495 u32 reclen = buf->len - sizeof(rpc_fraghdr);
496 rpc_fraghdr *base = buf->head[0].iov_base;
497 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
498}
499
176e21ee
CL		 500/**
501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
502 * @task: RPC task that manages the state of an RPC request
503 *
504 * Return values:
505 * 0: The request has been sent
506 * EAGAIN: The socket was blocked, please call again later to
507 * complete the request
508 * ENOTCONN: Caller needs to invoke connect logic then call again
509 * other: Some other error occured, the request was not sent
510 */
511static int xs_local_send_request(struct rpc_task *task)
512{
513 struct rpc_rqst *req = task->tk_rqstp;
514 struct rpc_xprt *xprt = req->rq_xprt;
515 struct sock_xprt *transport =
516 container_of(xprt, struct sock_xprt, xprt);
517 struct xdr_buf *xdr = &req->rq_snd_buf;
518 int status;
f279cd00 519 int sent = 0;
176e21ee
CL		 520
521 xs_encode_stream_record_marker(&req->rq_snd_buf);
522
523 xs_pktdump("packet data:",
524 req->rq_svec->iov_base, req->rq_svec->iov_len);
525
f279cd00
JB		 526 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
527 true, &sent);
176e21ee
CL		 528 dprintk("RPC: %s(%u) = %d\n",
529 __func__, xdr->len - req->rq_bytes_sent, status);
f279cd00
JB		 530 if (likely(sent > 0) || status == 0) {
531 req->rq_bytes_sent += sent;
532 req->rq_xmit_bytes_sent += sent;
176e21ee
CL		 533 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
534 req->rq_bytes_sent = 0;
535 return 0;
536 }
537 status = -EAGAIN;
538 }
539
540 switch (status) {
3601c4a9 541 case -ENOBUFS:
176e21ee
CL		 542 case -EAGAIN:
543 status = xs_nospace(task);
544 break;
545 default:
546 dprintk("RPC: sendmsg returned unrecognized error %d\n",
547 -status);
548 case -EPIPE:
549 xs_close(xprt);
550 status = -ENOTCONN;
551 }
552
553 return status;
554}
555
262965f5
CL		 556/**
557 * xs_udp_send_request - write an RPC request to a UDP socket
558 * @task: address of RPC task that manages the state of an RPC request
559 *
560 * Return values:
561 * 0: The request has been sent
562 * EAGAIN: The socket was blocked, please call again later to
563 * complete the request
564 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 565 * other: Some other error occurred, the request was not sent
262965f5
CL		 566 */
567static int xs_udp_send_request(struct rpc_task *task)
568{
569 struct rpc_rqst *req = task->tk_rqstp;
570 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 571 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 572 struct xdr_buf *xdr = &req->rq_snd_buf;
f279cd00 573 int sent = 0;
262965f5 574 int status;
a246b010 575
9903cd1c 576 xs_pktdump("packet data:",
a246b010
CL		 577 req->rq_svec->iov_base,
578 req->rq_svec->iov_len);
579
01d37c42
TM		 580 if (!xprt_bound(xprt))
581 return -ENOTCONN;
f279cd00
JB		 582 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
583 xdr, req->rq_bytes_sent, true, &sent);
a246b010 584
46121cf7 585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 586 xdr->len - req->rq_bytes_sent, status);
a246b010 587
3dedbb5c
JB		 588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
589 if (status == -EPERM)
590 goto process_status;
591
f279cd00
JB		 592 if (sent > 0 || status == 0) {
593 req->rq_xmit_bytes_sent += sent;
594 if (sent >= req->rq_slen)
2199700f
TM		 595 return 0;
596 /* Still some bytes left; set up for a retry later. */
262965f5 597 status = -EAGAIN;
2199700f 598 }
a246b010 599
3dedbb5c 600process_status:
262965f5 601 switch (status) {
fba91afb
TM		 602 case -ENOTSOCK:
603 status = -ENOTCONN;
604 /* Should we call xs_close() here? */
605 break;
b6ddf64f 606 case -EAGAIN:
5e3771ce 607 status = xs_nospace(task);
b6ddf64f 608 break;
c8485e4d
TM		 609 default:
610 dprintk("RPC: sendmsg returned unrecognized error %d\n",
611 -status);
262965f5 612 case -ENETUNREACH:
3601c4a9 613 case -ENOBUFS:
262965f5 614 case -EPIPE:
a246b010 615 case -ECONNREFUSED:
3dedbb5c 616 case -EPERM:
a246b010 617 /* When the server has died, an ICMP port unreachable message
9903cd1c 618 * prompts ECONNREFUSED. */
b6ddf64f 619 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 620 }
5fe46e9d 621
262965f5 622 return status;
a246b010
CL		 623}
624
e06799f9
TM		 625/**
626 * xs_tcp_shutdown - gracefully shut down a TCP socket
627 * @xprt: transport
628 *
629 * Initiates a graceful shutdown of the TCP socket by calling the
630 * equivalent of shutdown(SHUT_WR);
631 */
632static void xs_tcp_shutdown(struct rpc_xprt *xprt)
633{
634 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
635 struct socket *sock = transport->sock;
636
40b5ea0c 637 if (sock != NULL) {
e06799f9 638 kernel_sock_shutdown(sock, SHUT_WR);
40b5ea0c
TM		 639 trace_rpc_socket_shutdown(xprt, sock);
640 }
e06799f9
TM		 641}
642
9903cd1c 643/**
262965f5 644 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 645 * @task: address of RPC task that manages the state of an RPC request
646 *
647 * Return values:
262965f5
CL		 648 * 0: The request has been sent
649 * EAGAIN: The socket was blocked, please call again later to
650 * complete the request
651 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 652 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 653 *
654 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 655 * if sendmsg is not able to make progress?
9903cd1c 656 */
262965f5 657static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 658{
659 struct rpc_rqst *req = task->tk_rqstp;
660 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 662 struct xdr_buf *xdr = &req->rq_snd_buf;
a6b31d18 663 bool zerocopy = true;
b595bb15 664 int status;
f279cd00 665 int sent;
a246b010 666
61677eee 667 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 668
262965f5
CL		 669 xs_pktdump("packet data:",
670 req->rq_svec->iov_base,
671 req->rq_svec->iov_len);
a6b31d18
TM		 672 /* Don't use zero copy if this is a resend. If the RPC call
673 * completes while the socket holds a reference to the pages,
674 * then we may end up resending corrupted data.
675 */
676 if (task->tk_flags & RPC_TASK_SENT)
677 zerocopy = false;
a246b010
CL		 678
679 /* Continue transmitting the packet/record. We must be careful
680 * to cope with writespace callbacks arriving _after_ we have
262965f5 681 * called sendmsg(). */
a246b010 682 while (1) {
f279cd00
JB		 683 sent = 0;
684 status = xs_sendpages(transport->sock, NULL, 0, xdr,
685 req->rq_bytes_sent, zerocopy, &sent);
a246b010 686
46121cf7 687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 688 xdr->len - req->rq_bytes_sent, status);
a246b010 689
f279cd00 690 if (unlikely(sent == 0 && status < 0))
a246b010 691 break;
a246b010 692
262965f5
CL		 693 /* If we've sent the entire packet, immediately
694 * reset the count of bytes sent. */
f279cd00
JB		 695 req->rq_bytes_sent += sent;
696 req->rq_xmit_bytes_sent += sent;
262965f5
CL		 697 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
698 req->rq_bytes_sent = 0;
699 return 0;
700 }
a246b010 701
f279cd00 702 if (sent != 0)
06b4b681 703 continue;
a246b010 704 status = -EAGAIN;
06b4b681 705 break;
a246b010
CL		 706 }
707
262965f5 708 switch (status) {
fba91afb
TM		 709 case -ENOTSOCK:
710 status = -ENOTCONN;
711 /* Should we call xs_close() here? */
712 break;
3601c4a9 713 case -ENOBUFS:
262965f5 714 case -EAGAIN:
5e3771ce 715 status = xs_nospace(task);
262965f5 716 break;
c8485e4d
TM		 717 default:
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
719 -status);
262965f5 720 case -ECONNRESET:
2a9e1cfa
TM		 721 xs_tcp_shutdown(xprt);
722 case -ECONNREFUSED:
262965f5 723 case -ENOTCONN:
b9d2bb2e 724 case -EPIPE:
b6ddf64f 725 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 726 }
5fe46e9d 727
a246b010
CL		 728 return status;
729}
730
e0ab53de
TM		 731/**
732 * xs_tcp_release_xprt - clean up after a tcp transmission
733 * @xprt: transport
734 * @task: rpc task
735 *
736 * This cleans up if an error causes us to abort the transmission of a request.
737 * In this case, the socket may need to be reset in order to avoid confusing
738 * the server.
739 */
740static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
741{
742 struct rpc_rqst *req;
743
744 if (task != xprt->snd_task)
745 return;
746 if (task == NULL)
747 goto out_release;
748 req = task->tk_rqstp;
43cedbf0
TM		 749 if (req == NULL)
750 goto out_release;
e0ab53de
TM		 751 if (req->rq_bytes_sent == 0)
752 goto out_release;
753 if (req->rq_bytes_sent == req->rq_snd_buf.len)
754 goto out_release;
a4f0835c 755 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 756out_release:
757 xprt_release_xprt(xprt, task);
758}
759
2a9e1cfa
TM		 760static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
761{
762 transport->old_data_ready = sk->sk_data_ready;
763 transport->old_state_change = sk->sk_state_change;
764 transport->old_write_space = sk->sk_write_space;
2118071d 765 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 766}
767
768static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
769{
770 sk->sk_data_ready = transport->old_data_ready;
771 sk->sk_state_change = transport->old_state_change;
772 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 773 sk->sk_error_report = transport->old_error_report;
774}
775
776/**
777 * xs_error_report - callback to handle TCP socket state errors
778 * @sk: socket
779 *
780 * Note: we don't call sock_error() since there may be a rpc_task
781 * using the socket, and so we don't want to clear sk->sk_err.
782 */
783static void xs_error_report(struct sock *sk)
784{
785 struct rpc_xprt *xprt;
786 int err;
787
788 read_lock_bh(&sk->sk_callback_lock);
789 if (!(xprt = xprt_from_sock(sk)))
790 goto out;
791
792 err = -sk->sk_err;
793 if (err == 0)
794 goto out;
795 dprintk("RPC: xs_error_report client %p, error=%d...\n",
796 xprt, -err);
e8353c76 797 trace_rpc_socket_error(xprt, sk->sk_socket, err);
a743419f
BC		 798 if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state))
799 goto out;
2118071d
TM		 800 xprt_wake_pending_tasks(xprt, err);
801 out:
802 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 803}
804
fe315e76 805static void xs_reset_transport(struct sock_xprt *transport)
a246b010 806{
ee0ac0c2
CL		 807 struct socket *sock = transport->sock;
808 struct sock *sk = transport->inet;
a246b010 809
fe315e76
CL		 810 if (sk == NULL)
811 return;
9903cd1c 812
246408dc
TM		 813 transport->srcport = 0;
814
a246b010 815 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 816 transport->inet = NULL;
817 transport->sock = NULL;
a246b010 818
9903cd1c 819 sk->sk_user_data = NULL;
2a9e1cfa
TM		 820
821 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 822 write_unlock_bh(&sk->sk_callback_lock);
823
40b5ea0c 824 trace_rpc_socket_close(&transport->xprt, sock);
a246b010 825 sock_release(sock);
fe315e76
CL		 826}
827
828/**
829 * xs_close - close a socket
830 * @xprt: transport
831 *
832 * This is used when all requests are complete; ie, no DRC state remains
833 * on the server we want to save.
f75e6745
TM		 834 *
835 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
836 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 837 */
838static void xs_close(struct rpc_xprt *xprt)
839{
840 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
841
842 dprintk("RPC: xs_close xprt %p\n", xprt);
843
93dc41bd
N		 844 cancel_delayed_work_sync(&transport->connect_worker);
845
fe315e76 846 xs_reset_transport(transport);
61d0a8e6 847 xprt->reestablish_timeout = 0;
fe315e76 848
4e857c58 849 smp_mb__before_atomic();
7d1e8255 850 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 851 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 852 clear_bit(XPRT_CLOSING, &xprt->state);
4e857c58 853 smp_mb__after_atomic();
62da3b24 854 xprt_disconnect_done(xprt);
a246b010
CL		 855}
856
f75e6745
TM		 857static void xs_tcp_close(struct rpc_xprt *xprt)
858{
859 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
860 xs_close(xprt);
861 else
862 xs_tcp_shutdown(xprt);
863}
864
315f3812
KM		 865static void xs_xprt_free(struct rpc_xprt *xprt)
866{
867 xs_free_peer_addresses(xprt);
868 xprt_free(xprt);
869}
870
9903cd1c
CL		 871/**
872 * xs_destroy - prepare to shutdown a transport
873 * @xprt: doomed transport
874 *
875 */
876static void xs_destroy(struct rpc_xprt *xprt)
a246b010 877{
46121cf7 878 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 879
a1311d87 880 xs_close(xprt);
315f3812 881 xs_xprt_free(xprt);
a1311d87 882 module_put(THIS_MODULE);
a246b010
CL		 883}
884
176e21ee
CL		 885static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
886{
887 struct xdr_skb_reader desc = {
888 .skb = skb,
889 .offset = sizeof(rpc_fraghdr),
890 .count = skb->len - sizeof(rpc_fraghdr),
891 };
892
893 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
894 return -1;
895 if (desc.count)
896 return -1;
897 return 0;
898}
899
900/**
901 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
902 * @sk: socket with data to read
903 * @len: how much data to read
904 *
905 * Currently this assumes we can read the whole reply in a single gulp.
906 */
676d2369 907static void xs_local_data_ready(struct sock *sk)
176e21ee
CL		 908{
909 struct rpc_task *task;
910 struct rpc_xprt *xprt;
911 struct rpc_rqst *rovr;
912 struct sk_buff *skb;
913 int err, repsize, copied;
914 u32 _xid;
915 __be32 *xp;
916
917 read_lock_bh(&sk->sk_callback_lock);
918 dprintk("RPC: %s...\n", __func__);
919 xprt = xprt_from_sock(sk);
920 if (xprt == NULL)
921 goto out;
922
923 skb = skb_recv_datagram(sk, 0, 1, &err);
924 if (skb == NULL)
925 goto out;
926
176e21ee
CL		 927 repsize = skb->len - sizeof(rpc_fraghdr);
928 if (repsize < 4) {
929 dprintk("RPC: impossible RPC reply size %d\n", repsize);
930 goto dropit;
931 }
932
933 /* Copy the XID from the skb... */
934 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
935 if (xp == NULL)
936 goto dropit;
937
938 /* Look up and lock the request corresponding to the given XID */
939 spin_lock(&xprt->transport_lock);
940 rovr = xprt_lookup_rqst(xprt, *xp);
941 if (!rovr)
942 goto out_unlock;
943 task = rovr->rq_task;
944
945 copied = rovr->rq_private_buf.buflen;
946 if (copied > repsize)
947 copied = repsize;
948
949 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
950 dprintk("RPC: sk_buff copy failed\n");
951 goto out_unlock;
952 }
953
954 xprt_complete_rqst(task, copied);
955
956 out_unlock:
957 spin_unlock(&xprt->transport_lock);
958 dropit:
959 skb_free_datagram(sk, skb);
960 out:
961 read_unlock_bh(&sk->sk_callback_lock);
962}
963
9903cd1c
CL		 964/**
965 * xs_udp_data_ready - "data ready" callback for UDP sockets
966 * @sk: socket with data to read
967 * @len: how much data to read
968 *
a246b010 969 */
676d2369 970static void xs_udp_data_ready(struct sock *sk)
a246b010 971{
9903cd1c
CL		 972 struct rpc_task *task;
973 struct rpc_xprt *xprt;
a246b010 974 struct rpc_rqst *rovr;
9903cd1c 975 struct sk_buff *skb;
a246b010 976 int err, repsize, copied;
d8ed029d
AD		 977 u32 _xid;
978 __be32 *xp;
a246b010 979
f064af1e 980 read_lock_bh(&sk->sk_callback_lock);
46121cf7 981 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 982 if (!(xprt = xprt_from_sock(sk)))
a246b010 983 goto out;
a246b010
CL		 984
985 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
986 goto out;
987
a246b010
CL		 988 repsize = skb->len - sizeof(struct udphdr);
989 if (repsize < 4) {
46121cf7 990 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 991 goto dropit;
992 }
993
994 /* Copy the XID from the skb... */
995 xp = skb_header_pointer(skb, sizeof(struct udphdr),
996 sizeof(_xid), &_xid);
997 if (xp == NULL)
998 goto dropit;
999
1000 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 1001 spin_lock(&xprt->transport_lock);
a246b010
CL		 1002 rovr = xprt_lookup_rqst(xprt, *xp);
1003 if (!rovr)
1004 goto out_unlock;
1005 task = rovr->rq_task;
1006
a246b010
CL		 1007 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1008 copied = repsize;
1009
1010 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1011 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1012 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1013 goto out_unlock;
1781f7f5
HX		 1014 }
1015
1016 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1017
6a24dfb6 1018 xprt_adjust_cwnd(xprt, task, copied);
1570c1e4 1019 xprt_complete_rqst(task, copied);
a246b010
CL		 1020
1021 out_unlock:
4a0f8c04 1022 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1023 dropit:
1024 skb_free_datagram(sk, skb);
1025 out:
f064af1e 1026 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1027}
1028
a519fc7a
TM		 1029/*
1030 * Helper function to force a TCP close if the server is sending
1031 * junk and/or it has put us in CLOSE_WAIT
1032 */
1033static void xs_tcp_force_close(struct rpc_xprt *xprt)
1034{
1035 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1036 xprt_force_disconnect(xprt);
1037}
1038
dd456471 1039static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1040{
51971139 1041 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1042 size_t len, used;
1043 char *p;
1044
51971139
CL		 1045 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1046 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1047 used = xdr_skb_read_bits(desc, p, len);
51971139 1048 transport->tcp_offset += used;
a246b010
CL		 1049 if (used != len)
1050 return;
808012fb 1051
51971139
CL		 1052 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1053 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1054 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1055 else
e136d092 1056 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1057 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1058
e136d092 1059 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1060 transport->tcp_offset = 0;
808012fb 1061
a246b010 1062 /* Sanity check of the record length */
18dca02a 1063 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1064 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1065 xs_tcp_force_close(xprt);
9903cd1c 1066 return;
a246b010 1067 }
46121cf7 1068 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1069 transport->tcp_reclen);
a246b010
CL		 1070}
1071
51971139 1072static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1073{
51971139 1074 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1075 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1076 transport->tcp_offset = 0;
e136d092
CL		 1077 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1078 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1079 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1080 transport->tcp_copied = 0;
a246b010
CL		 1081 }
1082 }
1083}
1084
dd456471 1085static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1086{
1087 size_t len, used;
1088 char *p;
1089
51971139 1090 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1091 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1092 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1093 used = xdr_skb_read_bits(desc, p, len);
51971139 1094 transport->tcp_offset += used;
a246b010
CL		 1095 if (used != len)
1096 return;
e136d092 1097 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1098 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1099 transport->tcp_copied = 4;
18dca02a
RL		 1100 dprintk("RPC: reading %s XID %08x\n",
1101 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1102 : "request with",
51971139
CL		 1103 ntohl(transport->tcp_xid));
1104 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1105}
1106
18dca02a
RL		 1107static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1108 struct xdr_skb_reader *desc)
a246b010 1109{
18dca02a
RL		 1110 size_t len, used;
1111 u32 offset;
b76ce561 1112 char *p;
18dca02a
RL		 1113
1114 /*
1115 * We want transport->tcp_offset to be 8 at the end of this routine
1116 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1117 * When this function is called for the first time,
1118 * transport->tcp_offset is 4 (after having already read the xid).
1119 */
1120 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1121 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1122 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1123 p = ((char *) &transport->tcp_calldir) + offset;
1124 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1125 transport->tcp_offset += used;
1126 if (used != len)
1127 return;
f4a2e418 1128 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1129 /*
1130 * We don't yet have the XDR buffer, so we will write the calldir
1131 * out after we get the buffer from the 'struct rpc_rqst'
1132 */
b76ce561
TM		 1133 switch (ntohl(transport->tcp_calldir)) {
1134 case RPC_REPLY:
1135 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1136 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1137 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1138 break;
1139 case RPC_CALL:
1140 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1141 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1142 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1143 break;
1144 default:
1145 dprintk("RPC: invalid request message type\n");
a519fc7a 1146 xs_tcp_force_close(&transport->xprt);
b76ce561 1147 }
18dca02a
RL		 1148 xs_tcp_check_fraghdr(transport);
1149}
1150
44b98efd
RL		 1151static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1152 struct xdr_skb_reader *desc,
1153 struct rpc_rqst *req)
a246b010 1154{
44b98efd
RL		 1155 struct sock_xprt *transport =
1156 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1157 struct xdr_buf *rcvbuf;
1158 size_t len;
1159 ssize_t r;
1160
a246b010 1161 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1162
1163 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1164 /*
1165 * Save the RPC direction in the XDR buffer
1166 */
f4a2e418 1167 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1168 &transport->tcp_calldir,
1169 sizeof(transport->tcp_calldir));
1170 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1171 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1172 }
1173
a246b010 1174 len = desc->count;
51971139 1175 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1176 struct xdr_skb_reader my_desc;
a246b010 1177
51971139 1178 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1179 memcpy(&my_desc, desc, sizeof(my_desc));
1180 my_desc.count = len;
51971139 1181 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1182 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1183 desc->count -= r;
1184 desc->offset += r;
1185 } else
51971139 1186 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1187 desc, xdr_skb_read_bits);
a246b010
CL		 1188
1189 if (r > 0) {
51971139
CL		 1190 transport->tcp_copied += r;
1191 transport->tcp_offset += r;
a246b010
CL		 1192 }
1193 if (r != len) {
1194 /* Error when copying to the receive buffer,
1195 * usually because we weren't able to allocate
1196 * additional buffer pages. All we can do now
e136d092 1197 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1198 * will not receive any additional updates,
1199 * and time out.
1200 * Any remaining data from this record will
1201 * be discarded.
1202 */
e136d092 1203 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1204 dprintk("RPC: XID %08x truncated request\n",
51971139 1205 ntohl(transport->tcp_xid));
46121cf7
CL		 1206 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1207 "tcp_offset = %u, tcp_reclen = %u\n",
1208 xprt, transport->tcp_copied,
1209 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1210 return;
a246b010
CL		 1211 }
1212
46121cf7 1213 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1214 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1215 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1216 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1217 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1218
1219 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1220 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1221 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1222 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1223 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1224 }
44b98efd
RL		 1225}
1226
1227/*
1228 * Finds the request corresponding to the RPC xid and invokes the common
1229 * tcp read code to read the data.
1230 */
1231static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1232 struct xdr_skb_reader *desc)
1233{
1234 struct sock_xprt *transport =
1235 container_of(xprt, struct sock_xprt, xprt);
1236 struct rpc_rqst *req;
1237
1238 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1239
1240 /* Find and lock the request corresponding to this xid */
1241 spin_lock(&xprt->transport_lock);
1242 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1243 if (!req) {
1244 dprintk("RPC: XID %08x request not found!\n",
1245 ntohl(transport->tcp_xid));
1246 spin_unlock(&xprt->transport_lock);
1247 return -1;
1248 }
1249
1250 xs_tcp_read_common(xprt, desc, req);
1251
e136d092 1252 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1253 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1254
4a0f8c04 1255 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1256 return 0;
1257}
1258
9e00abc3 1259#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1260/*
1261 * Obtains an rpc_rqst previously allocated and invokes the common
1262 * tcp read code to read the data. The result is placed in the callback
1263 * queue.
1264 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1265 * connection and return -1.
1266 */
2ea24497 1267static int xs_tcp_read_callback(struct rpc_xprt *xprt,
44b98efd
RL		 1268 struct xdr_skb_reader *desc)
1269{
1270 struct sock_xprt *transport =
1271 container_of(xprt, struct sock_xprt, xprt);
1272 struct rpc_rqst *req;
1273
2ea24497
TM		 1274 /* Look up and lock the request corresponding to the given XID */
1275 spin_lock(&xprt->transport_lock);
1276 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
44b98efd 1277 if (req == NULL) {
2ea24497 1278 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1279 printk(KERN_WARNING "Callback slot table overflowed\n");
1280 xprt_force_disconnect(xprt);
1281 return -1;
1282 }
1283
44b98efd
RL		 1284 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1285 xs_tcp_read_common(xprt, desc, req);
1286
2ea24497
TM		 1287 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1288 xprt_complete_bc_request(req, transport->tcp_copied);
1289 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1290
1291 return 0;
1292}
1293
1294static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1295 struct xdr_skb_reader *desc)
1296{
1297 struct sock_xprt *transport =
1298 container_of(xprt, struct sock_xprt, xprt);
1299
1300 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1301 xs_tcp_read_reply(xprt, desc) :
1302 xs_tcp_read_callback(xprt, desc);
1303}
1304#else
1305static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1306 struct xdr_skb_reader *desc)
1307{
1308 return xs_tcp_read_reply(xprt, desc);
1309}
9e00abc3 1310#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1311
1312/*
1313 * Read data off the transport. This can be either an RPC_CALL or an
1314 * RPC_REPLY. Relay the processing to helper functions.
1315 */
1316static void xs_tcp_read_data(struct rpc_xprt *xprt,
1317 struct xdr_skb_reader *desc)
1318{
1319 struct sock_xprt *transport =
1320 container_of(xprt, struct sock_xprt, xprt);
1321
1322 if (_xs_tcp_read_data(xprt, desc) == 0)
1323 xs_tcp_check_fraghdr(transport);
1324 else {
1325 /*
1326 * The transport_lock protects the request handling.
1327 * There's no need to hold it to update the tcp_flags.
1328 */
1329 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1330 }
a246b010
CL		 1331}
1332
dd456471 1333static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1334{
1335 size_t len;
1336
51971139 1337 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1338 if (len > desc->count)
1339 len = desc->count;
1340 desc->count -= len;
1341 desc->offset += len;
51971139 1342 transport->tcp_offset += len;
46121cf7 1343 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1344 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1345}
1346
9903cd1c 1347static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1348{
1349 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1350 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1351 struct xdr_skb_reader desc = {
a246b010
CL		 1352 .skb = skb,
1353 .offset = offset,
1354 .count = len,
9903cd1c 1355 };
a246b010 1356
46121cf7 1357 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010 1358 do {
1a867a08 1359 trace_xs_tcp_data_recv(transport);
a246b010
CL		 1360 /* Read in a new fragment marker if necessary */
1361 /* Can we ever really expect to get completely empty fragments? */
e136d092 1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1363 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1364 continue;
1365 }
1366 /* Read in the xid if necessary */
e136d092 1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1368 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1369 continue;
1370 }
18dca02a 1371 /* Read in the call/reply flag */
f4a2e418 1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1373 xs_tcp_read_calldir(transport, &desc);
1374 continue;
1375 }
a246b010 1376 /* Read in the request data */
e136d092 1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1378 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1379 continue;
1380 }
1381 /* Skip over any trailing bytes on short reads */
51971139 1382 xs_tcp_read_discard(transport, &desc);
a246b010 1383 } while (desc.count);
1a867a08 1384 trace_xs_tcp_data_recv(transport);
46121cf7 1385 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1386 return len - desc.count;
1387}
1388
9903cd1c
CL		 1389/**
1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1391 * @sk: socket with data to read
1392 * @bytes: how much data to read
1393 *
1394 */
676d2369 1395static void xs_tcp_data_ready(struct sock *sk)
a246b010
CL		 1396{
1397 struct rpc_xprt *xprt;
1398 read_descriptor_t rd_desc;
ff2d7db8 1399 int read;
3705ad64 1400 unsigned long total = 0;
a246b010 1401
46121cf7
CL		 1402 dprintk("RPC: xs_tcp_data_ready...\n");
1403
f064af1e 1404 read_lock_bh(&sk->sk_callback_lock);
3705ad64
JL		 1405 if (!(xprt = xprt_from_sock(sk))) {
1406 read = 0;
a246b010 1407 goto out;
3705ad64 1408 }
61d0a8e6
NB		 1409 /* Any data means we had a useful conversation, so
1410 * the we don't need to delay the next reconnect
1411 */
1412 if (xprt->reestablish_timeout)
1413 xprt->reestablish_timeout = 0;
1414
9903cd1c 1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1416 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1417 do {
1418 rd_desc.count = 65536;
1419 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
3705ad64
JL		 1420 if (read > 0)
1421 total += read;
ff2d7db8 1422 } while (read > 0);
a246b010 1423out:
3705ad64 1424 trace_xs_tcp_data_ready(xprt, read, total);
f064af1e 1425 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1426}
1427
7d1e8255
TM		 1428/*
1429 * Do the equivalent of linger/linger2 handling for dealing with
1430 * broken servers that don't close the socket in a timely
1431 * fashion
1432 */
1433static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1434 unsigned long timeout)
1435{
1436 struct sock_xprt *transport;
1437
1438 if (xprt_test_and_set_connecting(xprt))
1439 return;
1440 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1441 transport = container_of(xprt, struct sock_xprt, xprt);
1442 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1443 timeout);
1444}
1445
1446static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1447{
1448 struct sock_xprt *transport;
1449
1450 transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1453 !cancel_delayed_work(&transport->connect_worker))
1454 return;
1455 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1456 xprt_clear_connecting(xprt);
1457}
1458
4bc1e68e 1459static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
7d1e8255 1460{
4e857c58 1461 smp_mb__before_atomic();
a519fc7a
TM		 1462 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1463 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1464 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1465 clear_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1466 smp_mb__after_atomic();
4bc1e68e
TM		 1467}
1468
1469static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1470{
1471 xs_sock_reset_connection_flags(xprt);
7d1e8255
TM		 1472 /* Mark transport as closed and wake up all pending tasks */
1473 xprt_disconnect_done(xprt);
1474}
1475
9903cd1c
CL		 1476/**
1477 * xs_tcp_state_change - callback to handle TCP socket state changes
1478 * @sk: socket whose state has changed
1479 *
1480 */
1481static void xs_tcp_state_change(struct sock *sk)
a246b010 1482{
9903cd1c 1483 struct rpc_xprt *xprt;
a246b010 1484
f064af1e 1485 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1486 if (!(xprt = xprt_from_sock(sk)))
1487 goto out;
46121cf7 1488 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1489 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1490 sk->sk_state, xprt_connected(xprt),
1491 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1492 sock_flag(sk, SOCK_ZAPPED),
1493 sk->sk_shutdown);
a246b010 1494
40b5ea0c 1495 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1496 switch (sk->sk_state) {
1497 case TCP_ESTABLISHED:
f064af1e 1498 spin_lock(&xprt->transport_lock);
a246b010 1499 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1500 struct sock_xprt *transport = container_of(xprt,
1501 struct sock_xprt, xprt);
1502
a246b010 1503 /* Reset TCP record info */
51971139
CL		 1504 transport->tcp_offset = 0;
1505 transport->tcp_reclen = 0;
1506 transport->tcp_copied = 0;
e136d092
CL		 1507 transport->tcp_flags =
1508 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
8b71798c 1509 xprt->connect_cookie++;
51971139 1510
2a491991 1511 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1512 }
f064af1e 1513 spin_unlock(&xprt->transport_lock);
a246b010 1514 break;
3b948ae5
TM		 1515 case TCP_FIN_WAIT1:
1516 /* The client initiated a shutdown of the socket */
7c1d71cf 1517 xprt->connect_cookie++;
663b8858 1518 xprt->reestablish_timeout = 0;
3b948ae5 1519 set_bit(XPRT_CLOSING, &xprt->state);
4e857c58 1520 smp_mb__before_atomic();
3b948ae5 1521 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1522 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
4e857c58 1523 smp_mb__after_atomic();
25fe6142 1524 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1525 break;
632e3bdc 1526 case TCP_CLOSE_WAIT:
3b948ae5 1527 /* The server initiated a shutdown of the socket */
7c1d71cf 1528 xprt->connect_cookie++;
d0bea455 1529 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1530 xs_tcp_force_close(xprt);
663b8858
TM		 1531 case TCP_CLOSING:
1532 /*
1533 * If the server closed down the connection, make sure that
1534 * we back off before reconnecting
1535 */
1536 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1537 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1538 break;
1539 case TCP_LAST_ACK:
670f9457 1540 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1541 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
4e857c58 1542 smp_mb__before_atomic();
3b948ae5 1543 clear_bit(XPRT_CONNECTED, &xprt->state);
4e857c58 1544 smp_mb__after_atomic();
3b948ae5
TM		 1545 break;
1546 case TCP_CLOSE:
7d1e8255
TM		 1547 xs_tcp_cancel_linger_timeout(xprt);
1548 xs_sock_mark_closed(xprt);
a246b010
CL		 1549 }
1550 out:
f064af1e 1551 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1552}
1553
1f0fa154
IJ		 1554static void xs_write_space(struct sock *sk)
1555{
1556 struct socket *sock;
1557 struct rpc_xprt *xprt;
1558
1559 if (unlikely(!(sock = sk->sk_socket)))
1560 return;
1561 clear_bit(SOCK_NOSPACE, &sock->flags);
1562
1563 if (unlikely(!(xprt = xprt_from_sock(sk))))
1564 return;
1565 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1566 return;
1567
1568 xprt_write_space(xprt);
1569}
1570
9903cd1c 1571/**
c7b2cae8
CL		 1572 * xs_udp_write_space - callback invoked when socket buffer space
1573 * becomes available
9903cd1c
CL		 1574 * @sk: socket whose state has changed
1575 *
a246b010
CL		 1576 * Called when more output buffer space is available for this socket.
1577 * We try not to wake our writers until they can make "significant"
c7b2cae8 1578 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1579 * with a bunch of small requests.
1580 */
c7b2cae8 1581static void xs_udp_write_space(struct sock *sk)
a246b010 1582{
f064af1e 1583 read_lock_bh(&sk->sk_callback_lock);
a246b010 1584
c7b2cae8 1585 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1586 if (sock_writeable(sk))
1587 xs_write_space(sk);
a246b010 1588
f064af1e 1589 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1590}
a246b010 1591
c7b2cae8
CL		 1592/**
1593 * xs_tcp_write_space - callback invoked when socket buffer space
1594 * becomes available
1595 * @sk: socket whose state has changed
1596 *
1597 * Called when more output buffer space is available for this socket.
1598 * We try not to wake our writers until they can make "significant"
1599 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1600 * with a bunch of small requests.
1601 */
1602static void xs_tcp_write_space(struct sock *sk)
1603{
f064af1e 1604 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1605
1606 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1607 if (sk_stream_is_writeable(sk))
1f0fa154 1608 xs_write_space(sk);
b6ddf64f 1609
f064af1e 1610 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1611}
1612
470056c2 1613static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1614{
ee0ac0c2
CL		 1615 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1616 struct sock *sk = transport->inet;
a246b010 1617
7c6e066e 1618 if (transport->rcvsize) {
a246b010 1619 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1620 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1621 }
7c6e066e 1622 if (transport->sndsize) {
a246b010 1623 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1624 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1625 sk->sk_write_space(sk);
1626 }
1627}
1628
43118c29 1629/**
470056c2 1630 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1631 * @xprt: generic transport
470056c2
CL		 1632 * @sndsize: requested size of send buffer, in bytes
1633 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1634 *
470056c2 1635 * Set socket send and receive buffer size limits.
43118c29 1636 */
470056c2 1637static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1638{
7c6e066e
CL		 1639 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1640
1641 transport->sndsize = 0;
470056c2 1642 if (sndsize)
7c6e066e
CL		 1643 transport->sndsize = sndsize + 1024;
1644 transport->rcvsize = 0;
470056c2 1645 if (rcvsize)
7c6e066e 1646 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1647
1648 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1649}
1650
46c0ee8b
CL		 1651/**
1652 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1653 * @task: task that timed out
1654 *
1655 * Adjust the congestion window after a retransmit timeout has occurred.
1656 */
6a24dfb6 1657static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1658{
6a24dfb6 1659 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
46c0ee8b
CL		 1660}
1661
b85d8806
CL		 1662static unsigned short xs_get_random_port(void)
1663{
1664 unsigned short range = xprt_max_resvport - xprt_min_resvport;
63862b5b 1665 unsigned short rand = (unsigned short) prandom_u32() % range;
b85d8806
CL		 1666 return rand + xprt_min_resvport;
1667}
1668
92200412
CL		 1669/**
1670 * xs_set_port - reset the port number in the remote endpoint address
1671 * @xprt: generic transport
1672 * @port: new port number
1673 *
1674 */
1675static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1676{
46121cf7 1677 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1678
9dc3b095
CL		 1679 rpc_set_port(xs_addr(xprt), port);
1680 xs_update_peer_port(xprt);
92200412
CL		 1681}
1682
5d4ec932 1683static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1684{
fbfffbd5 1685 unsigned short port = transport->srcport;
67a391d7
TM		 1686
1687 if (port == 0 && transport->xprt.resvport)
1688 port = xs_get_random_port();
1689 return port;
1690}
1691
baaf4e48 1692static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1693{
fbfffbd5
CL		 1694 if (transport->srcport != 0)
1695 transport->srcport = 0;
67a391d7
TM		 1696 if (!transport->xprt.resvport)
1697 return 0;
1698 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1699 return xprt_max_resvport;
1700 return --port;
1701}
beb59b68 1702static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1703{
beb59b68 1704 struct sockaddr_storage myaddr;
67a391d7 1705 int err, nloop = 0;
5d4ec932 1706 unsigned short port = xs_get_srcport(transport);
67a391d7 1707 unsigned short last;
a246b010 1708
0f7a622c
CP		 1709 /*
1710 * If we are asking for any ephemeral port (i.e. port == 0 &&
1711 * transport->xprt.resvport == 0), don't bind. Let the local
1712 * port selection happen implicitly when the socket is used
1713 * (for example at connect time).
1714 *
1715 * This ensures that we can continue to establish TCP
1716 * connections even when all local ephemeral ports are already
1717 * a part of some TCP connection. This makes no difference
1718 * for UDP sockets, but also doens't harm them.
1719 *
1720 * If we're asking for any reserved port (i.e. port == 0 &&
1721 * transport->xprt.resvport == 1) xs_get_srcport above will
1722 * ensure that port is non-zero and we will bind as needed.
1723 */
1724 if (port == 0)
1725 return 0;
1726
beb59b68 1727 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1728 do {
beb59b68
PE		 1729 rpc_set_port((struct sockaddr *)&myaddr, port);
1730 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1731 transport->xprt.addrlen);
a246b010 1732 if (err == 0) {
fbfffbd5 1733 transport->srcport = port;
d3bc9a1d 1734 break;
a246b010 1735 }
67a391d7 1736 last = port;
baaf4e48 1737 port = xs_next_srcport(transport, port);
67a391d7
TM		 1738 if (port > last)
1739 nloop++;
1740 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1741
4232e863 1742 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1743 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1744 &((struct sockaddr_in *)&myaddr)->sin_addr,
1745 port, err ? "failed" : "ok", err);
1746 else
1747 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1748 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1749 port, err ? "failed" : "ok", err);
a246b010
CL		 1750 return err;
1751}
1752
176e21ee
CL		 1753/*
1754 * We don't support autobind on AF_LOCAL sockets
1755 */
1756static void xs_local_rpcbind(struct rpc_task *task)
1757{
3dc0da27
TM		 1758 rcu_read_lock();
1759 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1760 rcu_read_unlock();
176e21ee
CL		 1761}
1762
1763static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1764{
1765}
beb59b68 1766
ed07536e
PZ		 1767#ifdef CONFIG_DEBUG_LOCK_ALLOC
1768static struct lock_class_key xs_key[2];
1769static struct lock_class_key xs_slock_key[2];
1770
176e21ee
CL		 1771static inline void xs_reclassify_socketu(struct socket *sock)
1772{
1773 struct sock *sk = sock->sk;
1774
176e21ee
CL		 1775 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1776 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1777}
1778
8945ee5e 1779static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1780{
1781 struct sock *sk = sock->sk;
8945ee5e 1782
8945ee5e
CL		 1783 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1784 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1785}
ed07536e 1786
8945ee5e
CL		 1787static inline void xs_reclassify_socket6(struct socket *sock)
1788{
1789 struct sock *sk = sock->sk;
ed07536e 1790
8945ee5e
CL		 1791 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1792 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1793}
6bc9638a
PE		 1794
1795static inline void xs_reclassify_socket(int family, struct socket *sock)
1796{
1b7a1819
WAA		 1797 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1798 if (sock_owned_by_user(sock->sk))
1799 return;
1800
4232e863 1801 switch (family) {
176e21ee
CL		 1802 case AF_LOCAL:
1803 xs_reclassify_socketu(sock);
1804 break;
4232e863 1805 case AF_INET:
6bc9638a 1806 xs_reclassify_socket4(sock);
4232e863
CL		 1807 break;
1808 case AF_INET6:
6bc9638a 1809 xs_reclassify_socket6(sock);
4232e863
CL		 1810 break;
1811 }
6bc9638a 1812}
ed07536e 1813#else
176e21ee
CL		 1814static inline void xs_reclassify_socketu(struct socket *sock)
1815{
1816}
1817
8945ee5e
CL		 1818static inline void xs_reclassify_socket4(struct socket *sock)
1819{
1820}
1821
1822static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1823{
1824}
6bc9638a
PE		 1825
1826static inline void xs_reclassify_socket(int family, struct socket *sock)
1827{
1828}
ed07536e
PZ		 1829#endif
1830
93dc41bd
N		 1831static void xs_dummy_setup_socket(struct work_struct *work)
1832{
1833}
1834
6bc9638a
PE		 1835static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1836 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1837{
1838 struct socket *sock;
1839 int err;
1840
6bc9638a 1841 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1842 if (err < 0) {
1843 dprintk("RPC: can't create %d transport socket (%d).\n",
1844 protocol, -err);
1845 goto out;
1846 }
6bc9638a 1847 xs_reclassify_socket(family, sock);
22f79326 1848
4cea288a
BH		 1849 err = xs_bind(transport, sock);
1850 if (err) {
22f79326
PE		 1851 sock_release(sock);
1852 goto out;
1853 }
1854
1855 return sock;
1856out:
1857 return ERR_PTR(err);
1858}
1859
176e21ee
CL		 1860static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1861 struct socket *sock)
1862{
1863 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1864 xprt);
1865
1866 if (!transport->inet) {
1867 struct sock *sk = sock->sk;
1868
1869 write_lock_bh(&sk->sk_callback_lock);
1870
1871 xs_save_old_callbacks(transport, sk);
1872
1873 sk->sk_user_data = xprt;
1874 sk->sk_data_ready = xs_local_data_ready;
1875 sk->sk_write_space = xs_udp_write_space;
2118071d 1876 sk->sk_error_report = xs_error_report;
176e21ee
CL		 1877 sk->sk_allocation = GFP_ATOMIC;
1878
1879 xprt_clear_connected(xprt);
1880
1881 /* Reset to new socket */
1882 transport->sock = sock;
1883 transport->inet = sk;
1884
1885 write_unlock_bh(&sk->sk_callback_lock);
1886 }
1887
1888 /* Tell the socket layer to start connecting... */
1889 xprt->stat.connect_count++;
1890 xprt->stat.connect_start = jiffies;
1891 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1892}
1893
1894/**
1895 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1896 * @xprt: RPC transport to connect
1897 * @transport: socket transport to connect
1898 * @create_sock: function to create a socket of the correct type
176e21ee 1899 */
dc107402 1900static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1901{
176e21ee
CL		 1902 struct rpc_xprt *xprt = &transport->xprt;
1903 struct socket *sock;
1904 int status = -EIO;
1905
176e21ee
CL		 1906 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1907 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1908 SOCK_STREAM, 0, &sock, 1);
1909 if (status < 0) {
1910 dprintk("RPC: can't create AF_LOCAL "
1911 "transport socket (%d).\n", -status);
1912 goto out;
1913 }
1914 xs_reclassify_socketu(sock);
1915
1916 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1917 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1918
1919 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 1920 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 1921 switch (status) {
1922 case 0:
1923 dprintk("RPC: xprt %p connected to %s\n",
1924 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1925 xprt_set_connected(xprt);
3601c4a9 1926 case -ENOBUFS:
176e21ee
CL		 1927 break;
1928 case -ENOENT:
1929 dprintk("RPC: xprt %p: socket %s does not exist\n",
1930 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1931 break;
4a20a988
TM		 1932 case -ECONNREFUSED:
1933 dprintk("RPC: xprt %p: connection refused for %s\n",
1934 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1935 break;
176e21ee
CL		 1936 default:
1937 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1938 __func__, -status,
1939 xprt->address_strings[RPC_DISPLAY_ADDR]);
1940 }
1941
1942out:
1943 xprt_clear_connecting(xprt);
1944 xprt_wake_pending_tasks(xprt, status);
dc107402
BF		 1945 return status;
1946}
1947
b6669737 1948static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1949{
dc107402
BF		 1950 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1951 int ret;
1952
1953 if (RPC_IS_ASYNC(task)) {
1954 /*
1955 * We want the AF_LOCAL connect to be resolved in the
1956 * filesystem namespace of the process making the rpc
1957 * call. Thus we connect synchronously.
1958 *
1959 * If we want to support asynchronous AF_LOCAL calls,
1960 * we'll need to figure out how to pass a namespace to
1961 * connect.
1962 */
1963 rpc_exit(task, -ENOTCONN);
1964 return;
1965 }
1966 ret = xs_local_setup_socket(transport);
1967 if (ret && !RPC_IS_SOFTCONN(task))
1968 msleep_interruptible(15000);
176e21ee
CL		 1969}
1970
a564b8f0
MG		 1971#ifdef CONFIG_SUNRPC_SWAP
1972static void xs_set_memalloc(struct rpc_xprt *xprt)
1973{
1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1975 xprt);
1976
1977 if (xprt->swapper)
1978 sk_set_memalloc(transport->inet);
1979}
1980
1981/**
1982 * xs_swapper - Tag this transport as being used for swap.
1983 * @xprt: transport to tag
1984 * @enable: enable/disable
1985 *
1986 */
1987int xs_swapper(struct rpc_xprt *xprt, int enable)
1988{
1989 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1990 xprt);
1991 int err = 0;
1992
1993 if (enable) {
1994 xprt->swapper++;
1995 xs_set_memalloc(xprt);
1996 } else if (xprt->swapper) {
1997 xprt->swapper--;
1998 sk_clear_memalloc(transport->inet);
1999 }
2000
2001 return err;
2002}
2003EXPORT_SYMBOL_GPL(xs_swapper);
2004#else
2005static void xs_set_memalloc(struct rpc_xprt *xprt)
2006{
2007}
2008#endif
2009
16be2d20
CL		 2010static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2011{
2012 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2013
2014 if (!transport->inet) {
2015 struct sock *sk = sock->sk;
2016
2017 write_lock_bh(&sk->sk_callback_lock);
2018
2a9e1cfa
TM		 2019 xs_save_old_callbacks(transport, sk);
2020
16be2d20 2021 sk->sk_user_data = xprt;
16be2d20
CL		 2022 sk->sk_data_ready = xs_udp_data_ready;
2023 sk->sk_write_space = xs_udp_write_space;
16be2d20
CL		 2024 sk->sk_allocation = GFP_ATOMIC;
2025
2026 xprt_set_connected(xprt);
2027
2028 /* Reset to new socket */
2029 transport->sock = sock;
2030 transport->inet = sk;
2031
a564b8f0
MG		 2032 xs_set_memalloc(xprt);
2033
16be2d20
CL		 2034 write_unlock_bh(&sk->sk_callback_lock);
2035 }
2036 xs_udp_do_set_buffer_size(xprt);
2037}
2038
8c14ff2a 2039static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2040{
34161db6
TM		 2041 struct sock_xprt *transport =
2042 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2043 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2044 struct socket *sock = transport->sock;
b65c0310 2045 int status = -EIO;
9903cd1c 2046
b0d93ad5 2047 /* Start by resetting any existing state */
fe315e76 2048 xs_reset_transport(transport);
8c14ff2a
PE		 2049 sock = xs_create_sock(xprt, transport,
2050 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2051 if (IS_ERR(sock))
b0d93ad5 2052 goto out;
68e220bd 2053
c740eff8
CL		 2054 dprintk("RPC: worker connecting xprt %p via %s to "
2055 "%s (port %s)\n", xprt,
2056 xprt->address_strings[RPC_DISPLAY_PROTO],
2057 xprt->address_strings[RPC_DISPLAY_ADDR],
2058 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2059
2060 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2061 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2062 status = 0;
2063out:
b0d93ad5 2064 xprt_clear_connecting(xprt);
7d1e8255 2065 xprt_wake_pending_tasks(xprt, status);
a246b010
CL		 2066}
2067
3167e12c
CL		 2068/*
2069 * We need to preserve the port number so the reply cache on the server can
2070 * find our cached RPC replies when we get around to reconnecting.
2071 */
58dddac9 2072static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2073{
2074 int result;
3167e12c
CL		 2075 struct sockaddr any;
2076
58dddac9 2077 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2078
2079 /*
2080 * Disconnect the transport socket by doing a connect operation
2081 * with AF_UNSPEC. This should return immediately...
2082 */
2083 memset(&any, 0, sizeof(any));
2084 any.sa_family = AF_UNSPEC;
ee0ac0c2 2085 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
40b5ea0c
TM		 2086 trace_rpc_socket_reset_connection(&transport->xprt,
2087 transport->sock, result);
7d1e8255 2088 if (!result)
4bc1e68e
TM		 2089 xs_sock_reset_connection_flags(&transport->xprt);
2090 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
3167e12c
CL		 2091}
2092
58dddac9 2093static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2094{
2095 unsigned int state = transport->inet->sk_state;
2096
669502ff
AC		 2097 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2098 /* we don't need to abort the connection if the socket
2099 * hasn't undergone a shutdown
2100 */
2101 if (transport->inet->sk_shutdown == 0)
2102 return;
2103 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2104 __func__, transport->inet->sk_shutdown);
2105 }
2106 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2107 /* we don't need to abort the connection if the socket
2108 * hasn't undergone a shutdown
2109 */
2110 if (transport->inet->sk_shutdown == 0)
2111 return;
2112 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2113 "sk_shutdown set to %d\n",
2114 __func__, transport->inet->sk_shutdown);
2115 }
58dddac9 2116 xs_abort_connection(transport);
40d2549d
TM		 2117}
2118
16be2d20 2119static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2120{
16be2d20 2121 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2122 int ret = -ENOTCONN;
edb267a6 2123
ee0ac0c2 2124 if (!transport->inet) {
b0d93ad5 2125 struct sock *sk = sock->sk;
7f260e85
TM		 2126 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2127 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2128 unsigned int opt_on = 1;
2129
2130 /* TCP Keepalive options */
2131 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2132 (char *)&opt_on, sizeof(opt_on));
2133 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2134 (char *)&keepidle, sizeof(keepidle));
2135 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2136 (char *)&keepidle, sizeof(keepidle));
2137 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2138 (char *)&keepcnt, sizeof(keepcnt));
b0d93ad5
CL		 2139
2140 write_lock_bh(&sk->sk_callback_lock);
2141
2a9e1cfa
TM		 2142 xs_save_old_callbacks(transport, sk);
2143
b0d93ad5 2144 sk->sk_user_data = xprt;
b0d93ad5
CL		 2145 sk->sk_data_ready = xs_tcp_data_ready;
2146 sk->sk_state_change = xs_tcp_state_change;
2147 sk->sk_write_space = xs_tcp_write_space;
2118071d 2148 sk->sk_error_report = xs_error_report;
b079fa7b 2149 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2150
2151 /* socket options */
2152 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2153 sock_reset_flag(sk, SOCK_LINGER);
2154 tcp_sk(sk)->linger2 = 0;
2155 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2156
2157 xprt_clear_connected(xprt);
2158
2159 /* Reset to new socket */
ee0ac0c2
CL		 2160 transport->sock = sock;
2161 transport->inet = sk;
b0d93ad5
CL		 2162
2163 write_unlock_bh(&sk->sk_callback_lock);
2164 }
2165
01d37c42 2166 if (!xprt_bound(xprt))
fe19a96b 2167 goto out;
01d37c42 2168
a564b8f0
MG		 2169 xs_set_memalloc(xprt);
2170
b0d93ad5 2171 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2172 xprt->stat.connect_count++;
2173 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2174 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2175 switch (ret) {
2176 case 0:
2177 case -EINPROGRESS:
2178 /* SYN_SENT! */
fe19a96b
TM		 2179 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2180 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2181 }
2182out:
2183 return ret;
16be2d20
CL		 2184}
2185
9903cd1c 2186/**
b61d59ff
TM		 2187 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2188 * @xprt: RPC transport to connect
2189 * @transport: socket transport to connect
2190 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2191 *
2192 * Invoked by a work queue tasklet.
a246b010 2193 */
cdd518d5 2194static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2195{
cdd518d5
PE		 2196 struct sock_xprt *transport =
2197 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2198 struct socket *sock = transport->sock;
a9f5f0f7 2199 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2200 int status = -EIO;
a246b010 2201
ee0ac0c2 2202 if (!sock) {
7d1e8255 2203 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2204 sock = xs_create_sock(xprt, transport,
2205 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2206 if (IS_ERR(sock)) {
2207 status = PTR_ERR(sock);
3167e12c
CL		 2208 goto out;
2209 }
7d1e8255
TM		 2210 } else {
2211 int abort_and_exit;
a246b010 2212
7d1e8255
TM		 2213 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2214 &xprt->state);
3167e12c 2215 /* "close" the socket, preserving the local port */
a743419f 2216 set_bit(XPRT_CONNECTION_REUSE, &xprt->state);
58dddac9 2217 xs_tcp_reuse_connection(transport);
a743419f 2218 clear_bit(XPRT_CONNECTION_REUSE, &xprt->state);
a246b010 2219
7d1e8255
TM		 2220 if (abort_and_exit)
2221 goto out_eagain;
2222 }
a246b010 2223
c740eff8
CL		 2224 dprintk("RPC: worker connecting xprt %p via %s to "
2225 "%s (port %s)\n", xprt,
2226 xprt->address_strings[RPC_DISPLAY_PROTO],
2227 xprt->address_strings[RPC_DISPLAY_ADDR],
2228 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2229
16be2d20 2230 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2231 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2232 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2233 xprt, -status, xprt_connected(xprt),
2234 sock->sk->sk_state);
2a491991 2235 switch (status) {
f75e6745
TM		 2236 default:
2237 printk("%s: connect returned unhandled error %d\n",
2238 __func__, status);
2239 case -EADDRNOTAVAIL:
2240 /* We're probably in TIME_WAIT. Get rid of existing socket,
2241 * and retry
2242 */
a519fc7a 2243 xs_tcp_force_close(xprt);
88b5ed73 2244 break;
2a491991
TM		 2245 case 0:
2246 case -EINPROGRESS:
2247 case -EALREADY:
7d1e8255
TM		 2248 xprt_clear_connecting(xprt);
2249 return;
9fcfe0c8
TM		 2250 case -EINVAL:
2251 /* Happens, for instance, if the user specified a link
2252 * local IPv6 address without a scope-id.
2253 */
3ed5e2a2
TM		 2254 case -ECONNREFUSED:
2255 case -ECONNRESET:
2256 case -ENETUNREACH:
3601c4a9 2257 case -ENOBUFS:
3ed5e2a2 2258 /* retry with existing socket, after a delay */
9fcfe0c8 2259 goto out;
a246b010 2260 }
7d1e8255 2261out_eagain:
2a491991 2262 status = -EAGAIN;
a246b010 2263out:
68e220bd 2264 xprt_clear_connecting(xprt);
7d1e8255 2265 xprt_wake_pending_tasks(xprt, status);
68e220bd 2266}
b0d93ad5 2267
9903cd1c
CL		 2268/**
2269 * xs_connect - connect a socket to a remote endpoint
1b092092 2270 * @xprt: pointer to transport structure
9903cd1c
CL		 2271 * @task: address of RPC task that manages state of connect request
2272 *
2273 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2274 *
2275 * UDP socket connects are synchronous, but we use a work queue anyway
2276 * to guarantee that even unprivileged user processes can set up a
2277 * socket on a privileged port.
2278 *
2279 * If a UDP socket connect fails, the delay behavior here prevents
2280 * retry floods (hard mounts).
9903cd1c 2281 */
1b092092 2282static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2283{
ee0ac0c2 2284 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2285
09a21c41 2286 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2287 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2288 "seconds\n",
03bf4b70 2289 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2290 queue_delayed_work(rpciod_workqueue,
2291 &transport->connect_worker,
2292 xprt->reestablish_timeout);
03bf4b70 2293 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2294 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2295 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2296 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2297 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2298 } else {
46121cf7 2299 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2300 queue_delayed_work(rpciod_workqueue,
2301 &transport->connect_worker, 0);
a246b010
CL		 2302 }
2303}
2304
176e21ee
CL		 2305/**
2306 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2307 * @xprt: rpc_xprt struct containing statistics
2308 * @seq: output file
2309 *
2310 */
2311static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2312{
2313 long idle_time = 0;
2314
2315 if (xprt_connected(xprt))
2316 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2317
2318 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2319 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2320 xprt->stat.bind_count,
2321 xprt->stat.connect_count,
2322 xprt->stat.connect_time,
2323 idle_time,
2324 xprt->stat.sends,
2325 xprt->stat.recvs,
2326 xprt->stat.bad_xids,
2327 xprt->stat.req_u,
15a45206
AA		 2328 xprt->stat.bklog_u,
2329 xprt->stat.max_slots,
2330 xprt->stat.sending_u,
2331 xprt->stat.pending_u);
176e21ee
CL		 2332}
2333
262ca07d
CL		 2334/**
2335 * xs_udp_print_stats - display UDP socket-specifc stats
2336 * @xprt: rpc_xprt struct containing statistics
2337 * @seq: output file
2338 *
2339 */
2340static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2341{
c8475461
CL		 2342 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2343
15a45206
AA		 2344 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2345 "%lu %llu %llu\n",
fbfffbd5 2346 transport->srcport,
262ca07d
CL		 2347 xprt->stat.bind_count,
2348 xprt->stat.sends,
2349 xprt->stat.recvs,
2350 xprt->stat.bad_xids,
2351 xprt->stat.req_u,
15a45206
AA		 2352 xprt->stat.bklog_u,
2353 xprt->stat.max_slots,
2354 xprt->stat.sending_u,
2355 xprt->stat.pending_u);
262ca07d
CL		 2356}
2357
2358/**
2359 * xs_tcp_print_stats - display TCP socket-specifc stats
2360 * @xprt: rpc_xprt struct containing statistics
2361 * @seq: output file
2362 *
2363 */
2364static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2365{
c8475461 2366 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2367 long idle_time = 0;
2368
2369 if (xprt_connected(xprt))
2370 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2371
15a45206
AA		 2372 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2373 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2374 transport->srcport,
262ca07d
CL		 2375 xprt->stat.bind_count,
2376 xprt->stat.connect_count,
2377 xprt->stat.connect_time,
2378 idle_time,
2379 xprt->stat.sends,
2380 xprt->stat.recvs,
2381 xprt->stat.bad_xids,
2382 xprt->stat.req_u,
15a45206
AA		 2383 xprt->stat.bklog_u,
2384 xprt->stat.max_slots,
2385 xprt->stat.sending_u,
2386 xprt->stat.pending_u);
262ca07d
CL		 2387}
2388
4cfc7e60
RI		 2389/*
2390 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2391 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2392 * to use the server side send routines.
2393 */
5a51f13a 2394static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2395{
2396 struct page *page;
2397 struct rpc_buffer *buf;
2398
b8a13d03
WAA		 2399 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2400 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2401 return NULL;
4cfc7e60 2402
b8a13d03 2403 page = alloc_page(GFP_KERNEL);
4cfc7e60
RI		 2404 if (!page)
2405 return NULL;
2406
2407 buf = page_address(page);
2408 buf->len = PAGE_SIZE;
2409
2410 return buf->data;
2411}
2412
2413/*
2414 * Free the space allocated in the bc_alloc routine
2415 */
5a51f13a 2416static void bc_free(void *buffer)
4cfc7e60
RI		 2417{
2418 struct rpc_buffer *buf;
2419
2420 if (!buffer)
2421 return;
2422
2423 buf = container_of(buffer, struct rpc_buffer, data);
2424 free_page((unsigned long)buf);
2425}
2426
2427/*
2428 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2429 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2430 */
2431static int bc_sendto(struct rpc_rqst *req)
2432{
2433 int len;
2434 struct xdr_buf *xbufp = &req->rq_snd_buf;
2435 struct rpc_xprt *xprt = req->rq_xprt;
2436 struct sock_xprt *transport =
2437 container_of(xprt, struct sock_xprt, xprt);
2438 struct socket *sock = transport->sock;
2439 unsigned long headoff;
2440 unsigned long tailoff;
2441
61677eee 2442 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2443
2444 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2445 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2446 len = svc_send_common(sock, xbufp,
2447 virt_to_page(xbufp->head[0].iov_base), headoff,
2448 xbufp->tail[0].iov_base, tailoff);
2449
2450 if (len != xbufp->len) {
2451 printk(KERN_NOTICE "Error sending entire callback!\n");
2452 len = -EAGAIN;
2453 }
2454
2455 return len;
2456}
2457
2458/*
2459 * The send routine. Borrows from svc_send
2460 */
2461static int bc_send_request(struct rpc_task *task)
2462{
2463 struct rpc_rqst *req = task->tk_rqstp;
2464 struct svc_xprt *xprt;
4cfc7e60
RI		 2465 u32 len;
2466
2467 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2468 /*
2469 * Get the server socket associated with this callback xprt
2470 */
2471 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2472
2473 /*
2474 * Grab the mutex to serialize data as the connection is shared
2475 * with the fore channel
2476 */
2477 if (!mutex_trylock(&xprt->xpt_mutex)) {
2478 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2479 if (!mutex_trylock(&xprt->xpt_mutex))
2480 return -EAGAIN;
2481 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2482 }
2483 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2484 len = -ENOTCONN;
2485 else
2486 len = bc_sendto(req);
2487 mutex_unlock(&xprt->xpt_mutex);
2488
2489 if (len > 0)
2490 len = 0;
2491
2492 return len;
2493}
2494
2495/*
2496 * The close routine. Since this is client initiated, we do nothing
2497 */
2498
2499static void bc_close(struct rpc_xprt *xprt)
2500{
4cfc7e60
RI		 2501}
2502
2503/*
2504 * The xprt destroy routine. Again, because this connection is client
2505 * initiated, we do nothing
2506 */
2507
2508static void bc_destroy(struct rpc_xprt *xprt)
2509{
47f72efa
KM		 2510 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2511
2512 xs_xprt_free(xprt);
2513 module_put(THIS_MODULE);
4cfc7e60
RI		 2514}
2515
176e21ee
CL		 2516static struct rpc_xprt_ops xs_local_ops = {
2517 .reserve_xprt = xprt_reserve_xprt,
2518 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2519 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2520 .rpcbind = xs_local_rpcbind,
2521 .set_port = xs_local_set_port,
dc107402 2522 .connect = xs_local_connect,
176e21ee
CL		 2523 .buf_alloc = rpc_malloc,
2524 .buf_free = rpc_free,
2525 .send_request = xs_local_send_request,
2526 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2527 .close = xs_close,
a1311d87 2528 .destroy = xs_destroy,
176e21ee
CL		 2529 .print_stats = xs_local_print_stats,
2530};
2531
262965f5 2532static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2533 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2534 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2535 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2536 .alloc_slot = xprt_alloc_slot,
45160d62 2537 .rpcbind = rpcb_getport_async,
92200412 2538 .set_port = xs_set_port,
262965f5 2539 .connect = xs_connect,
02107148
CL		 2540 .buf_alloc = rpc_malloc,
2541 .buf_free = rpc_free,
262965f5 2542 .send_request = xs_udp_send_request,
fe3aca29 2543 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2544 .timer = xs_udp_timer,
a58dd398 2545 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2546 .close = xs_close,
2547 .destroy = xs_destroy,
262ca07d 2548 .print_stats = xs_udp_print_stats,
262965f5
CL		 2549};
2550
2551static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2552 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2553 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2554 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2555 .rpcbind = rpcb_getport_async,
92200412 2556 .set_port = xs_set_port,
0b9e7943 2557 .connect = xs_connect,
02107148
CL		 2558 .buf_alloc = rpc_malloc,
2559 .buf_free = rpc_free,
262965f5 2560 .send_request = xs_tcp_send_request,
fe3aca29 2561 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2562 .close = xs_tcp_close,
9903cd1c 2563 .destroy = xs_destroy,
262ca07d 2564 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2565};
2566
4cfc7e60
RI		 2567/*
2568 * The rpc_xprt_ops for the server backchannel
2569 */
2570
2571static struct rpc_xprt_ops bc_tcp_ops = {
2572 .reserve_xprt = xprt_reserve_xprt,
2573 .release_xprt = xprt_release_xprt,
84e28a30 2574 .alloc_slot = xprt_alloc_slot,
4cfc7e60
RI		 2575 .buf_alloc = bc_malloc,
2576 .buf_free = bc_free,
2577 .send_request = bc_send_request,
2578 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2579 .close = bc_close,
2580 .destroy = bc_destroy,
2581 .print_stats = xs_tcp_print_stats,
2582};
2583
92476850
CL		 2584static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2585{
2586 static const struct sockaddr_in sin = {
2587 .sin_family = AF_INET,
2588 .sin_addr.s_addr = htonl(INADDR_ANY),
2589 };
2590 static const struct sockaddr_in6 sin6 = {
2591 .sin6_family = AF_INET6,
2592 .sin6_addr = IN6ADDR_ANY_INIT,
2593 };
2594
2595 switch (family) {
176e21ee
CL		 2596 case AF_LOCAL:
2597 break;
92476850
CL		 2598 case AF_INET:
2599 memcpy(sap, &sin, sizeof(sin));
2600 break;
2601 case AF_INET6:
2602 memcpy(sap, &sin6, sizeof(sin6));
2603 break;
2604 default:
2605 dprintk("RPC: %s: Bad address family\n", __func__);
2606 return -EAFNOSUPPORT;
2607 }
2608 return 0;
2609}
2610
3c341b0b 2611static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2612 unsigned int slot_table_size,
2613 unsigned int max_slot_table_size)
c8541ecd
CL		 2614{
2615 struct rpc_xprt *xprt;
ffc2e518 2616 struct sock_xprt *new;
c8541ecd 2617
96802a09 2618 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2619 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2620 return ERR_PTR(-EBADF);
2621 }
2622
d9ba131d
TM		 2623 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2624 max_slot_table_size);
bd1722d4 2625 if (xprt == NULL) {
46121cf7
CL		 2626 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2627 "rpc_xprt\n");
c8541ecd
CL		 2628 return ERR_PTR(-ENOMEM);
2629 }
c8541ecd 2630
bd1722d4 2631 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2632 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2633 xprt->addrlen = args->addrlen;
d3bc9a1d 2634 if (args->srcaddr)
fbfffbd5 2635 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2636 else {
2637 int err;
2638 err = xs_init_anyaddr(args->dstaddr->sa_family,
2639 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2640 if (err != 0) {
2641 xprt_free(xprt);
92476850 2642 return ERR_PTR(err);
2aa13531 2643 }
92476850 2644 }
c8541ecd
CL		 2645
2646 return xprt;
2647}
2648
176e21ee
CL		 2649static const struct rpc_timeout xs_local_default_timeout = {
2650 .to_initval = 10 * HZ,
2651 .to_maxval = 10 * HZ,
2652 .to_retries = 2,
2653};
2654
2655/**
2656 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2657 * @args: rpc transport creation arguments
2658 *
2659 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2660 */
2661static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2662{
2663 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2664 struct sock_xprt *transport;
2665 struct rpc_xprt *xprt;
2666 struct rpc_xprt *ret;
2667
d9ba131d
TM		 2668 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2669 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2670 if (IS_ERR(xprt))
2671 return xprt;
2672 transport = container_of(xprt, struct sock_xprt, xprt);
2673
2674 xprt->prot = 0;
2675 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2676 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2677
2678 xprt->bind_timeout = XS_BIND_TO;
2679 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2680 xprt->idle_timeout = XS_IDLE_DISC_TO;
2681
2682 xprt->ops = &xs_local_ops;
2683 xprt->timeout = &xs_local_default_timeout;
2684
93dc41bd
N		 2685 INIT_DELAYED_WORK(&transport->connect_worker,
2686 xs_dummy_setup_socket);
2687
176e21ee
CL		 2688 switch (sun->sun_family) {
2689 case AF_LOCAL:
2690 if (sun->sun_path[0] != '/') {
2691 dprintk("RPC: bad AF_LOCAL address: %s\n",
2692 sun->sun_path);
2693 ret = ERR_PTR(-EINVAL);
2694 goto out_err;
2695 }
2696 xprt_set_bound(xprt);
176e21ee 2697 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2698 ret = ERR_PTR(xs_local_setup_socket(transport));
2699 if (ret)
2700 goto out_err;
176e21ee
CL		 2701 break;
2702 default:
2703 ret = ERR_PTR(-EAFNOSUPPORT);
2704 goto out_err;
2705 }
2706
2707 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2708 xprt->address_strings[RPC_DISPLAY_ADDR]);
2709
2710 if (try_module_get(THIS_MODULE))
2711 return xprt;
2712 ret = ERR_PTR(-EINVAL);
2713out_err:
315f3812 2714 xs_xprt_free(xprt);
176e21ee
CL		 2715 return ret;
2716}
2717
2881ae74
TM		 2718static const struct rpc_timeout xs_udp_default_timeout = {
2719 .to_initval = 5 * HZ,
2720 .to_maxval = 30 * HZ,
2721 .to_increment = 5 * HZ,
2722 .to_retries = 5,
2723};
2724
9903cd1c
CL		 2725/**
2726 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2727 * @args: rpc transport creation arguments
9903cd1c
CL		 2728 *
2729 */
483066d6 2730static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2731{
8f9d5b1a 2732 struct sockaddr *addr = args->dstaddr;
c8541ecd 2733 struct rpc_xprt *xprt;
c8475461 2734 struct sock_xprt *transport;
0a68b0be 2735 struct rpc_xprt *ret;
a246b010 2736
d9ba131d
TM		 2737 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2738 xprt_udp_slot_table_entries);
c8541ecd
CL		 2739 if (IS_ERR(xprt))
2740 return xprt;
c8475461 2741 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2742
ec739ef0 2743 xprt->prot = IPPROTO_UDP;
808012fb 2744 xprt->tsh_size = 0;
a246b010
CL		 2745 /* XXX: header size can vary due to auth type, IPv6, etc. */
2746 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2747
03bf4b70 2748 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2749 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2750 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2751
262965f5 2752 xprt->ops = &xs_udp_ops;
a246b010 2753
ba7392bb 2754 xprt->timeout = &xs_udp_default_timeout;
a246b010 2755
8f9d5b1a
CL		 2756 switch (addr->sa_family) {
2757 case AF_INET:
2758 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2759 xprt_set_bound(xprt);
2760
2761 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2762 xs_udp_setup_socket);
9dc3b095 2763 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2764 break;
2765 case AF_INET6:
2766 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2767 xprt_set_bound(xprt);
2768
2769 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2770 xs_udp_setup_socket);
9dc3b095 2771 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2772 break;
2773 default:
0a68b0be
BF		 2774 ret = ERR_PTR(-EAFNOSUPPORT);
2775 goto out_err;
8f9d5b1a
CL		 2776 }
2777
c740eff8
CL		 2778 if (xprt_bound(xprt))
2779 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2780 xprt->address_strings[RPC_DISPLAY_ADDR],
2781 xprt->address_strings[RPC_DISPLAY_PORT],
2782 xprt->address_strings[RPC_DISPLAY_PROTO]);
2783 else
2784 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2785 xprt->address_strings[RPC_DISPLAY_ADDR],
2786 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2787
bc25571e
TT		 2788 if (try_module_get(THIS_MODULE))
2789 return xprt;
0a68b0be
BF		 2790 ret = ERR_PTR(-EINVAL);
2791out_err:
315f3812 2792 xs_xprt_free(xprt);
0a68b0be 2793 return ret;
a246b010
CL		 2794}
2795
2881ae74
TM		 2796static const struct rpc_timeout xs_tcp_default_timeout = {
2797 .to_initval = 60 * HZ,
2798 .to_maxval = 60 * HZ,
2799 .to_retries = 2,
2800};
2801
9903cd1c
CL		 2802/**
2803 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2804 * @args: rpc transport creation arguments
9903cd1c
CL		 2805 *
2806 */
483066d6 2807static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2808{
8f9d5b1a 2809 struct sockaddr *addr = args->dstaddr;
c8541ecd 2810 struct rpc_xprt *xprt;
c8475461 2811 struct sock_xprt *transport;
0a68b0be 2812 struct rpc_xprt *ret;
b7993ceb
TM		 2813 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2814
2815 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2816 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 2817
d9ba131d 2818 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 2819 max_slot_table_size);
c8541ecd
CL		 2820 if (IS_ERR(xprt))
2821 return xprt;
c8475461 2822 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2823
ec739ef0 2824 xprt->prot = IPPROTO_TCP;
808012fb 2825 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2826 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2827
03bf4b70 2828 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2829 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2830 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2831
262965f5 2832 xprt->ops = &xs_tcp_ops;
ba7392bb 2833 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2834
8f9d5b1a
CL		 2835 switch (addr->sa_family) {
2836 case AF_INET:
2837 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2838 xprt_set_bound(xprt);
2839
9dc3b095 2840 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2841 xs_tcp_setup_socket);
9dc3b095 2842 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2843 break;
2844 case AF_INET6:
2845 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2846 xprt_set_bound(xprt);
2847
9dc3b095 2848 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2849 xs_tcp_setup_socket);
9dc3b095 2850 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2851 break;
2852 default:
0a68b0be
BF		 2853 ret = ERR_PTR(-EAFNOSUPPORT);
2854 goto out_err;
8f9d5b1a
CL		 2855 }
2856
c740eff8
CL		 2857 if (xprt_bound(xprt))
2858 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2859 xprt->address_strings[RPC_DISPLAY_ADDR],
2860 xprt->address_strings[RPC_DISPLAY_PORT],
2861 xprt->address_strings[RPC_DISPLAY_PROTO]);
2862 else
2863 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2864 xprt->address_strings[RPC_DISPLAY_ADDR],
2865 xprt->address_strings[RPC_DISPLAY_PROTO]);
2866
bc25571e
TT		 2867 if (try_module_get(THIS_MODULE))
2868 return xprt;
0a68b0be
BF		 2869 ret = ERR_PTR(-EINVAL);
2870out_err:
315f3812 2871 xs_xprt_free(xprt);
0a68b0be 2872 return ret;
a246b010 2873}
282b32e1 2874
f300baba
AB		 2875/**
2876 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2877 * @args: rpc transport creation arguments
2878 *
2879 */
2880static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2881{
2882 struct sockaddr *addr = args->dstaddr;
2883 struct rpc_xprt *xprt;
2884 struct sock_xprt *transport;
2885 struct svc_sock *bc_sock;
0a68b0be 2886 struct rpc_xprt *ret;
f300baba 2887
d9ba131d
TM		 2888 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2889 xprt_tcp_slot_table_entries);
f300baba
AB		 2890 if (IS_ERR(xprt))
2891 return xprt;
2892 transport = container_of(xprt, struct sock_xprt, xprt);
2893
2894 xprt->prot = IPPROTO_TCP;
2895 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2896 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2897 xprt->timeout = &xs_tcp_default_timeout;
2898
2899 /* backchannel */
2900 xprt_set_bound(xprt);
2901 xprt->bind_timeout = 0;
f300baba
AB		 2902 xprt->reestablish_timeout = 0;
2903 xprt->idle_timeout = 0;
2904
f300baba
AB		 2905 xprt->ops = &bc_tcp_ops;
2906
2907 switch (addr->sa_family) {
2908 case AF_INET:
2909 xs_format_peer_addresses(xprt, "tcp",
2910 RPCBIND_NETID_TCP);
2911 break;
2912 case AF_INET6:
2913 xs_format_peer_addresses(xprt, "tcp",
2914 RPCBIND_NETID_TCP6);
2915 break;
2916 default:
0a68b0be
BF		 2917 ret = ERR_PTR(-EAFNOSUPPORT);
2918 goto out_err;
f300baba
AB		 2919 }
2920
50fa0d40
PE		 2921 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2922 xprt->address_strings[RPC_DISPLAY_ADDR],
2923 xprt->address_strings[RPC_DISPLAY_PORT],
2924 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2925
99de8ea9
BF		 2926 /*
2927 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 2928 * we want to keep it around as long as the connection lasts,
2929 * in case we need to start using it for a backchannel again;
2930 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 2931 */
2932 xprt_get(xprt);
2933 args->bc_xprt->xpt_bc_xprt = xprt;
2934 xprt->bc_xprt = args->bc_xprt;
2935 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2936 transport->sock = bc_sock->sk_sock;
2937 transport->inet = bc_sock->sk_sk;
2938
f300baba
AB		 2939 /*
2940 * Since we don't want connections for the backchannel, we set
2941 * the xprt status to connected
2942 */
2943 xprt_set_connected(xprt);
2944
f300baba
AB		 2945 if (try_module_get(THIS_MODULE))
2946 return xprt;
642aab58
KM		 2947
2948 args->bc_xprt->xpt_bc_xprt = NULL;
99de8ea9 2949 xprt_put(xprt);
0a68b0be
BF		 2950 ret = ERR_PTR(-EINVAL);
2951out_err:
315f3812 2952 xs_xprt_free(xprt);
0a68b0be 2953 return ret;
f300baba
AB		 2954}
2955
176e21ee
CL		 2956static struct xprt_class xs_local_transport = {
2957 .list = LIST_HEAD_INIT(xs_local_transport.list),
2958 .name = "named UNIX socket",
2959 .owner = THIS_MODULE,
2960 .ident = XPRT_TRANSPORT_LOCAL,
2961 .setup = xs_setup_local,
2962};
2963
bc25571e
TT		 2964static struct xprt_class xs_udp_transport = {
2965 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2966 .name = "udp",
2967 .owner = THIS_MODULE,
f300baba 2968 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 2969 .setup = xs_setup_udp,
2970};
2971
2972static struct xprt_class xs_tcp_transport = {
2973 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2974 .name = "tcp",
2975 .owner = THIS_MODULE,
f300baba 2976 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 2977 .setup = xs_setup_tcp,
2978};
2979
f300baba
AB		 2980static struct xprt_class xs_bc_tcp_transport = {
2981 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2982 .name = "tcp NFSv4.1 backchannel",
2983 .owner = THIS_MODULE,
2984 .ident = XPRT_TRANSPORT_BC_TCP,
2985 .setup = xs_setup_bc_tcp,
2986};
2987
282b32e1 2988/**
bc25571e 2989 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 2990 *
2991 */
2992int init_socket_xprt(void)
2993{
f895b252 2994#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2b1bec5f 2995 if (!sunrpc_table_header)
0b4d4147 2996 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 2997#endif
2998
176e21ee 2999 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 3000 xprt_register_transport(&xs_udp_transport);
3001 xprt_register_transport(&xs_tcp_transport);
f300baba 3002 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 3003
282b32e1
CL		 3004 return 0;
3005}
3006
3007/**
bc25571e 3008 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 3009 *
3010 */
3011void cleanup_socket_xprt(void)
3012{
f895b252 3013#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
fbf76683
CL		 3014 if (sunrpc_table_header) {
3015 unregister_sysctl_table(sunrpc_table_header);
3016 sunrpc_table_header = NULL;
3017 }
3018#endif
bc25571e 3019
176e21ee 3020 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 3021 xprt_unregister_transport(&xs_udp_transport);
3022 xprt_unregister_transport(&xs_tcp_transport);
f300baba 3023 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 3024}
cbf11071 3025
9bbb9e5a
RR		 3026static int param_set_uint_minmax(const char *val,
3027 const struct kernel_param *kp,
cbf11071
TM		 3028 unsigned int min, unsigned int max)
3029{
00cfaa94 3030 unsigned int num;
cbf11071
TM		 3031 int ret;
3032
3033 if (!val)
3034 return -EINVAL;
00cfaa94 3035 ret = kstrtouint(val, 0, &num);
cbf11071
TM		 3036 if (ret == -EINVAL || num < min || num > max)
3037 return -EINVAL;
3038 *((unsigned int *)kp->arg) = num;
3039 return 0;
3040}
3041
9bbb9e5a 3042static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 3043{
3044 return param_set_uint_minmax(val, kp,
3045 RPC_MIN_RESVPORT,
3046 RPC_MAX_RESVPORT);
3047}
3048
9bbb9e5a
RR		 3049static struct kernel_param_ops param_ops_portnr = {
3050 .set = param_set_portnr,
3051 .get = param_get_uint,
3052};
3053
cbf11071
TM		 3054#define param_check_portnr(name, p) \
3055 __param_check(name, p, unsigned int);
3056
3057module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3058module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3059
9bbb9e5a
RR		 3060static int param_set_slot_table_size(const char *val,
3061 const struct kernel_param *kp)
cbf11071
TM		 3062{
3063 return param_set_uint_minmax(val, kp,
3064 RPC_MIN_SLOT_TABLE,
3065 RPC_MAX_SLOT_TABLE);
3066}
3067
9bbb9e5a
RR		 3068static struct kernel_param_ops param_ops_slot_table_size = {
3069 .set = param_set_slot_table_size,
3070 .get = param_get_uint,
3071};
3072
cbf11071
TM		 3073#define param_check_slot_table_size(name, p) \
3074 __param_check(name, p, unsigned int);
3075
d9ba131d
TM		 3076static int param_set_max_slot_table_size(const char *val,
3077 const struct kernel_param *kp)
3078{
3079 return param_set_uint_minmax(val, kp,
3080 RPC_MIN_SLOT_TABLE,
3081 RPC_MAX_SLOT_TABLE_LIMIT);
3082}
3083
3084static struct kernel_param_ops param_ops_max_slot_table_size = {
3085 .set = param_set_max_slot_table_size,
3086 .get = param_get_uint,
3087};
3088
3089#define param_check_max_slot_table_size(name, p) \
3090 __param_check(name, p, unsigned int);
3091
cbf11071
TM		 3092module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3093 slot_table_size, 0644);
d9ba131d
TM		 3094module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3095 max_slot_table_size, 0644);
cbf11071
TM		 3096module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3097 slot_table_size, 0644);
3098
Linux kernel - Deliverables
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