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svcrdma: fix offset calculation for non-page aligned sge entries
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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
78#ifdef RPC_DEBUG
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
a246b010
CL		 189#ifdef RPC_DEBUG
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
ffc2e518
CL		 219struct sock_xprt {
220 struct rpc_xprt xprt;
ee0ac0c2
CL		 221
222 /*
223 * Network layer
224 */
225 struct socket * sock;
226 struct sock * inet;
51971139
CL		 227
228 /*
229 * State of TCP reply receive
230 */
231 __be32 tcp_fraghdr,
b76ce561
TM		 232 tcp_xid,
233 tcp_calldir;
51971139
CL		 234
235 u32 tcp_offset,
236 tcp_reclen;
237
238 unsigned long tcp_copied,
239 tcp_flags;
c8475461
CL		 240
241 /*
242 * Connection of transports
243 */
34161db6 244 struct delayed_work connect_worker;
fbfffbd5
CL		 245 struct sockaddr_storage srcaddr;
246 unsigned short srcport;
7c6e066e
CL		 247
248 /*
249 * UDP socket buffer size parameters
250 */
251 size_t rcvsize,
252 sndsize;
314dfd79
CL		 253
254 /*
255 * Saved socket callback addresses
256 */
257 void (*old_data_ready)(struct sock *, int);
258 void (*old_state_change)(struct sock *);
259 void (*old_write_space)(struct sock *);
2118071d 260 void (*old_error_report)(struct sock *);
ffc2e518
CL		 261};
262
e136d092
CL		 263/*
264 * TCP receive state flags
265 */
266#define TCP_RCV_LAST_FRAG (1UL << 0)
267#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268#define TCP_RCV_COPY_XID (1UL << 2)
269#define TCP_RCV_COPY_DATA (1UL << 3)
f4a2e418
RL		 270#define TCP_RCV_READ_CALLDIR (1UL << 4)
271#define TCP_RCV_COPY_CALLDIR (1UL << 5)
18dca02a
RL		 272
273/*
274 * TCP RPC flags
275 */
f4a2e418 276#define TCP_RPC_REPLY (1UL << 6)
e136d092 277
2118071d
TM		 278static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
279{
280 return (struct rpc_xprt *) sk->sk_user_data;
281}
282
95392c59
CL		 283static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
284{
285 return (struct sockaddr *) &xprt->addr;
286}
287
176e21ee
CL		 288static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
289{
290 return (struct sockaddr_un *) &xprt->addr;
291}
292
95392c59 293static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
edb267a6 294{
95392c59
CL		 295 return (struct sockaddr_in *) &xprt->addr;
296}
297
298static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
299{
300 return (struct sockaddr_in6 *) &xprt->addr;
301}
302
c877b849 303static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
edb267a6 304{
c877b849 305 struct sockaddr *sap = xs_addr(xprt);
9dc3b095
CL		 306 struct sockaddr_in6 *sin6;
307 struct sockaddr_in *sin;
176e21ee 308 struct sockaddr_un *sun;
c877b849 309 char buf[128];
edb267a6 310
9dc3b095 311 switch (sap->sa_family) {
176e21ee
CL		 312 case AF_LOCAL:
313 sun = xs_addr_un(xprt);
314 strlcpy(buf, sun->sun_path, sizeof(buf));
315 xprt->address_strings[RPC_DISPLAY_ADDR] =
316 kstrdup(buf, GFP_KERNEL);
317 break;
9dc3b095 318 case AF_INET:
176e21ee
CL		 319 (void)rpc_ntop(sap, buf, sizeof(buf));
320 xprt->address_strings[RPC_DISPLAY_ADDR] =
321 kstrdup(buf, GFP_KERNEL);
9dc3b095 322 sin = xs_addr_in(xprt);
fc0b5791 323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
9dc3b095
CL		 324 break;
325 case AF_INET6:
176e21ee
CL		 326 (void)rpc_ntop(sap, buf, sizeof(buf));
327 xprt->address_strings[RPC_DISPLAY_ADDR] =
328 kstrdup(buf, GFP_KERNEL);
9dc3b095 329 sin6 = xs_addr_in6(xprt);
fc0b5791 330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
9dc3b095
CL		 331 break;
332 default:
333 BUG();
756805e7 334 }
176e21ee 335
9dc3b095 336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
edb267a6
CL		 337}
338
9dc3b095 339static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
4b6473fb 340{
9dc3b095
CL		 341 struct sockaddr *sap = xs_addr(xprt);
342 char buf[128];
4b6473fb 343
81160e66 344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
c877b849 345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
4b6473fb 346
81160e66 347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
c877b849
CL		 348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
349}
4b6473fb 350
9dc3b095
CL		 351static void xs_format_peer_addresses(struct rpc_xprt *xprt,
352 const char *protocol,
353 const char *netid)
c877b849 354{
b454ae90 355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
b454ae90 356 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
c877b849 357 xs_format_common_peer_addresses(xprt);
9dc3b095 358 xs_format_common_peer_ports(xprt);
edb267a6 359}
4b6473fb 360
9dc3b095 361static void xs_update_peer_port(struct rpc_xprt *xprt)
4b6473fb 362{
9dc3b095
CL		 363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
4417c8c4 365
9dc3b095 366 xs_format_common_peer_ports(xprt);
edb267a6
CL		 367}
368
369static void xs_free_peer_addresses(struct rpc_xprt *xprt)
370{
33e01dc7
CL		 371 unsigned int i;
372
373 for (i = 0; i < RPC_DISPLAY_MAX; i++)
374 switch (i) {
375 case RPC_DISPLAY_PROTO:
376 case RPC_DISPLAY_NETID:
377 continue;
378 default:
379 kfree(xprt->address_strings[i]);
380 }
edb267a6
CL		 381}
382
b4b5cc85
CL		 383#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
384
24c5684b 385static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
b4b5cc85 386{
b4b5cc85
CL		 387 struct msghdr msg = {
388 .msg_name = addr,
389 .msg_namelen = addrlen,
24c5684b
TM		 390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
391 };
392 struct kvec iov = {
393 .iov_base = vec->iov_base + base,
394 .iov_len = vec->iov_len - base,
b4b5cc85
CL		 395 };
396
24c5684b 397 if (iov.iov_len != 0)
b4b5cc85
CL		 398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
399 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
400}
401
a6b31d18 402static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
b4b5cc85 403{
a6b31d18
TM		 404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
405 int offset, size_t size, int flags);
24c5684b
TM		 406 struct page **ppage;
407 unsigned int remainder;
408 int err, sent = 0;
409
410 remainder = xdr->page_len - base;
411 base += xdr->page_base;
412 ppage = xdr->pages + (base >> PAGE_SHIFT);
413 base &= ~PAGE_MASK;
a6b31d18
TM		 414 do_sendpage = sock->ops->sendpage;
415 if (!zerocopy)
416 do_sendpage = sock_no_sendpage;
24c5684b
TM		 417 for(;;) {
418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
419 int flags = XS_SENDMSG_FLAGS;
b4b5cc85 420
24c5684b
TM		 421 remainder -= len;
422 if (remainder != 0 || more)
423 flags |= MSG_MORE;
a6b31d18 424 err = do_sendpage(sock, *ppage, base, len, flags);
24c5684b
TM		 425 if (remainder == 0 || err != len)
426 break;
427 sent += err;
428 ppage++;
429 base = 0;
430 }
431 if (sent == 0)
432 return err;
433 if (err > 0)
434 sent += err;
435 return sent;
b4b5cc85
CL		 436}
437
9903cd1c
CL		 438/**
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
a6b31d18 445 * @zerocopy: true if it is safe to use sendpage()
9903cd1c 446 *
a246b010 447 */
a6b31d18 448static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
a246b010 449{
24c5684b
TM		 450 unsigned int remainder = xdr->len - base;
451 int err, sent = 0;
a246b010 452
262965f5 453 if (unlikely(!sock))
fba91afb 454 return -ENOTSOCK;
262965f5
CL		 455
456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
24c5684b
TM		 457 if (base != 0) {
458 addr = NULL;
459 addrlen = 0;
460 }
262965f5 461
24c5684b
TM		 462 if (base < xdr->head[0].iov_len || addr != NULL) {
463 unsigned int len = xdr->head[0].iov_len - base;
464 remainder -= len;
465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
466 if (remainder == 0 || err != len)
a246b010 467 goto out;
24c5684b 468 sent += err;
a246b010
CL		 469 base = 0;
470 } else
24c5684b 471 base -= xdr->head[0].iov_len;
a246b010 472
24c5684b
TM		 473 if (base < xdr->page_len) {
474 unsigned int len = xdr->page_len - base;
475 remainder -= len;
a6b31d18 476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
24c5684b 477 if (remainder == 0 || err != len)
a246b010 478 goto out;
24c5684b 479 sent += err;
a246b010 480 base = 0;
24c5684b
TM		 481 } else
482 base -= xdr->page_len;
483
484 if (base >= xdr->tail[0].iov_len)
485 return sent;
486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
a246b010 487out:
24c5684b
TM		 488 if (sent == 0)
489 return err;
490 if (err > 0)
491 sent += err;
492 return sent;
a246b010
CL		 493}
494
b6ddf64f
TM		 495static void xs_nospace_callback(struct rpc_task *task)
496{
497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
498
499 transport->inet->sk_write_pending--;
500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
501}
502
9903cd1c 503/**
262965f5
CL		 504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
9903cd1c 506 *
a246b010 507 */
5e3771ce 508static int xs_nospace(struct rpc_task *task)
a246b010 509{
262965f5
CL		 510 struct rpc_rqst *req = task->tk_rqstp;
511 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
24ca9a84 513 int ret = -EAGAIN;
a246b010 514
46121cf7 515 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
262965f5
CL		 516 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
517 req->rq_slen);
518
b6ddf64f
TM		 519 /* Protect against races with write_space */
520 spin_lock_bh(&xprt->transport_lock);
521
522 /* Don't race with disconnect */
523 if (xprt_connected(xprt)) {
524 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
525 /*
526 * Notify TCP that we're limited by the application
527 * window size
528 */
529 set_bit(SOCK_NOSPACE, &transport->sock->flags);
530 transport->inet->sk_write_pending++;
531 /* ...and wait for more buffer space */
532 xprt_wait_for_buffer_space(task, xs_nospace_callback);
533 }
534 } else {
535 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
5e3771ce 536 ret = -ENOTCONN;
b6ddf64f 537 }
262965f5 538
b6ddf64f 539 spin_unlock_bh(&xprt->transport_lock);
5e3771ce 540 return ret;
262965f5
CL		 541}
542
61677eee
CL		 543/*
544 * Construct a stream transport record marker in @buf.
545 */
546static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
547{
548 u32 reclen = buf->len - sizeof(rpc_fraghdr);
549 rpc_fraghdr *base = buf->head[0].iov_base;
550 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
551}
552
176e21ee
CL		 553/**
554 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
555 * @task: RPC task that manages the state of an RPC request
556 *
557 * Return values:
558 * 0: The request has been sent
559 * EAGAIN: The socket was blocked, please call again later to
560 * complete the request
561 * ENOTCONN: Caller needs to invoke connect logic then call again
562 * other: Some other error occured, the request was not sent
563 */
564static int xs_local_send_request(struct rpc_task *task)
565{
566 struct rpc_rqst *req = task->tk_rqstp;
567 struct rpc_xprt *xprt = req->rq_xprt;
568 struct sock_xprt *transport =
569 container_of(xprt, struct sock_xprt, xprt);
570 struct xdr_buf *xdr = &req->rq_snd_buf;
571 int status;
572
573 xs_encode_stream_record_marker(&req->rq_snd_buf);
574
575 xs_pktdump("packet data:",
576 req->rq_svec->iov_base, req->rq_svec->iov_len);
577
578 status = xs_sendpages(transport->sock, NULL, 0,
a6b31d18 579 xdr, req->rq_bytes_sent, true);
176e21ee
CL		 580 dprintk("RPC: %s(%u) = %d\n",
581 __func__, xdr->len - req->rq_bytes_sent, status);
582 if (likely(status >= 0)) {
583 req->rq_bytes_sent += status;
584 req->rq_xmit_bytes_sent += status;
585 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
586 req->rq_bytes_sent = 0;
587 return 0;
588 }
589 status = -EAGAIN;
590 }
591
592 switch (status) {
593 case -EAGAIN:
594 status = xs_nospace(task);
595 break;
596 default:
597 dprintk("RPC: sendmsg returned unrecognized error %d\n",
598 -status);
599 case -EPIPE:
600 xs_close(xprt);
601 status = -ENOTCONN;
602 }
603
604 return status;
605}
606
262965f5
CL		 607/**
608 * xs_udp_send_request - write an RPC request to a UDP socket
609 * @task: address of RPC task that manages the state of an RPC request
610 *
611 * Return values:
612 * 0: The request has been sent
613 * EAGAIN: The socket was blocked, please call again later to
614 * complete the request
615 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 616 * other: Some other error occurred, the request was not sent
262965f5
CL		 617 */
618static int xs_udp_send_request(struct rpc_task *task)
619{
620 struct rpc_rqst *req = task->tk_rqstp;
621 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 622 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5
CL		 623 struct xdr_buf *xdr = &req->rq_snd_buf;
624 int status;
a246b010 625
9903cd1c 626 xs_pktdump("packet data:",
a246b010
CL		 627 req->rq_svec->iov_base,
628 req->rq_svec->iov_len);
629
01d37c42
TM		 630 if (!xprt_bound(xprt))
631 return -ENOTCONN;
ee0ac0c2 632 status = xs_sendpages(transport->sock,
95392c59 633 xs_addr(xprt),
ee0ac0c2 634 xprt->addrlen, xdr,
a6b31d18 635 req->rq_bytes_sent, true);
a246b010 636
46121cf7 637 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
262965f5 638 xdr->len - req->rq_bytes_sent, status);
a246b010 639
2199700f 640 if (status >= 0) {
d60dbb20 641 req->rq_xmit_bytes_sent += status;
2199700f
TM		 642 if (status >= req->rq_slen)
643 return 0;
644 /* Still some bytes left; set up for a retry later. */
262965f5 645 status = -EAGAIN;
2199700f 646 }
a246b010 647
262965f5 648 switch (status) {
fba91afb
TM		 649 case -ENOTSOCK:
650 status = -ENOTCONN;
651 /* Should we call xs_close() here? */
652 break;
b6ddf64f 653 case -EAGAIN:
5e3771ce 654 status = xs_nospace(task);
b6ddf64f 655 break;
c8485e4d
TM		 656 default:
657 dprintk("RPC: sendmsg returned unrecognized error %d\n",
658 -status);
262965f5
CL		 659 case -ENETUNREACH:
660 case -EPIPE:
a246b010
CL		 661 case -ECONNREFUSED:
662 /* When the server has died, an ICMP port unreachable message
9903cd1c 663 * prompts ECONNREFUSED. */
b6ddf64f 664 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 665 }
5fe46e9d 666
262965f5 667 return status;
a246b010
CL		 668}
669
e06799f9
TM		 670/**
671 * xs_tcp_shutdown - gracefully shut down a TCP socket
672 * @xprt: transport
673 *
674 * Initiates a graceful shutdown of the TCP socket by calling the
675 * equivalent of shutdown(SHUT_WR);
676 */
677static void xs_tcp_shutdown(struct rpc_xprt *xprt)
678{
679 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
680 struct socket *sock = transport->sock;
681
40b5ea0c 682 if (sock != NULL) {
e06799f9 683 kernel_sock_shutdown(sock, SHUT_WR);
40b5ea0c
TM		 684 trace_rpc_socket_shutdown(xprt, sock);
685 }
e06799f9
TM		 686}
687
9903cd1c 688/**
262965f5 689 * xs_tcp_send_request - write an RPC request to a TCP socket
9903cd1c
CL		 690 * @task: address of RPC task that manages the state of an RPC request
691 *
692 * Return values:
262965f5
CL		 693 * 0: The request has been sent
694 * EAGAIN: The socket was blocked, please call again later to
695 * complete the request
696 * ENOTCONN: Caller needs to invoke connect logic then call again
25985edc 697 * other: Some other error occurred, the request was not sent
9903cd1c
CL		 698 *
699 * XXX: In the case of soft timeouts, should we eventually give up
262965f5 700 * if sendmsg is not able to make progress?
9903cd1c 701 */
262965f5 702static int xs_tcp_send_request(struct rpc_task *task)
a246b010
CL		 703{
704 struct rpc_rqst *req = task->tk_rqstp;
705 struct rpc_xprt *xprt = req->rq_xprt;
ee0ac0c2 706 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262965f5 707 struct xdr_buf *xdr = &req->rq_snd_buf;
a6b31d18 708 bool zerocopy = true;
b595bb15 709 int status;
a246b010 710
61677eee 711 xs_encode_stream_record_marker(&req->rq_snd_buf);
a246b010 712
262965f5
CL		 713 xs_pktdump("packet data:",
714 req->rq_svec->iov_base,
715 req->rq_svec->iov_len);
a6b31d18
TM		 716 /* Don't use zero copy if this is a resend. If the RPC call
717 * completes while the socket holds a reference to the pages,
718 * then we may end up resending corrupted data.
719 */
720 if (task->tk_flags & RPC_TASK_SENT)
721 zerocopy = false;
a246b010
CL		 722
723 /* Continue transmitting the packet/record. We must be careful
724 * to cope with writespace callbacks arriving _after_ we have
262965f5 725 * called sendmsg(). */
a246b010 726 while (1) {
ee0ac0c2 727 status = xs_sendpages(transport->sock,
a6b31d18
TM		 728 NULL, 0, xdr, req->rq_bytes_sent,
729 zerocopy);
a246b010 730
46121cf7 731 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
262965f5 732 xdr->len - req->rq_bytes_sent, status);
a246b010 733
262965f5 734 if (unlikely(status < 0))
a246b010 735 break;
a246b010 736
262965f5
CL		 737 /* If we've sent the entire packet, immediately
738 * reset the count of bytes sent. */
739 req->rq_bytes_sent += status;
d60dbb20 740 req->rq_xmit_bytes_sent += status;
262965f5
CL		 741 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
742 req->rq_bytes_sent = 0;
743 return 0;
744 }
a246b010 745
06b4b681
TM		 746 if (status != 0)
747 continue;
a246b010 748 status = -EAGAIN;
06b4b681 749 break;
a246b010
CL		 750 }
751
262965f5 752 switch (status) {
fba91afb
TM		 753 case -ENOTSOCK:
754 status = -ENOTCONN;
755 /* Should we call xs_close() here? */
756 break;
262965f5 757 case -EAGAIN:
5e3771ce 758 status = xs_nospace(task);
262965f5 759 break;
c8485e4d
TM		 760 default:
761 dprintk("RPC: sendmsg returned unrecognized error %d\n",
762 -status);
262965f5 763 case -ECONNRESET:
2a9e1cfa
TM		 764 xs_tcp_shutdown(xprt);
765 case -ECONNREFUSED:
262965f5 766 case -ENOTCONN:
b9d2bb2e 767 case -EPIPE:
b6ddf64f 768 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
a246b010 769 }
5fe46e9d 770
a246b010
CL		 771 return status;
772}
773
e0ab53de
TM		 774/**
775 * xs_tcp_release_xprt - clean up after a tcp transmission
776 * @xprt: transport
777 * @task: rpc task
778 *
779 * This cleans up if an error causes us to abort the transmission of a request.
780 * In this case, the socket may need to be reset in order to avoid confusing
781 * the server.
782 */
783static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
784{
785 struct rpc_rqst *req;
786
787 if (task != xprt->snd_task)
788 return;
789 if (task == NULL)
790 goto out_release;
791 req = task->tk_rqstp;
43cedbf0
TM		 792 if (req == NULL)
793 goto out_release;
e0ab53de
TM		 794 if (req->rq_bytes_sent == 0)
795 goto out_release;
796 if (req->rq_bytes_sent == req->rq_snd_buf.len)
797 goto out_release;
a4f0835c 798 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
e0ab53de
TM		 799out_release:
800 xprt_release_xprt(xprt, task);
801}
802
2a9e1cfa
TM		 803static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
804{
805 transport->old_data_ready = sk->sk_data_ready;
806 transport->old_state_change = sk->sk_state_change;
807 transport->old_write_space = sk->sk_write_space;
2118071d 808 transport->old_error_report = sk->sk_error_report;
2a9e1cfa
TM		 809}
810
811static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
812{
813 sk->sk_data_ready = transport->old_data_ready;
814 sk->sk_state_change = transport->old_state_change;
815 sk->sk_write_space = transport->old_write_space;
2118071d
TM		 816 sk->sk_error_report = transport->old_error_report;
817}
818
819/**
820 * xs_error_report - callback to handle TCP socket state errors
821 * @sk: socket
822 *
823 * Note: we don't call sock_error() since there may be a rpc_task
824 * using the socket, and so we don't want to clear sk->sk_err.
825 */
826static void xs_error_report(struct sock *sk)
827{
828 struct rpc_xprt *xprt;
829 int err;
830
831 read_lock_bh(&sk->sk_callback_lock);
832 if (!(xprt = xprt_from_sock(sk)))
833 goto out;
834
835 err = -sk->sk_err;
836 if (err == 0)
837 goto out;
838 dprintk("RPC: xs_error_report client %p, error=%d...\n",
839 xprt, -err);
e8353c76 840 trace_rpc_socket_error(xprt, sk->sk_socket, err);
2118071d
TM		 841 xprt_wake_pending_tasks(xprt, err);
842 out:
843 read_unlock_bh(&sk->sk_callback_lock);
2a9e1cfa
TM		 844}
845
fe315e76 846static void xs_reset_transport(struct sock_xprt *transport)
a246b010 847{
ee0ac0c2
CL		 848 struct socket *sock = transport->sock;
849 struct sock *sk = transport->inet;
a246b010 850
fe315e76
CL		 851 if (sk == NULL)
852 return;
9903cd1c 853
246408dc
TM		 854 transport->srcport = 0;
855
a246b010 856 write_lock_bh(&sk->sk_callback_lock);
ee0ac0c2
CL		 857 transport->inet = NULL;
858 transport->sock = NULL;
a246b010 859
9903cd1c 860 sk->sk_user_data = NULL;
2a9e1cfa
TM		 861
862 xs_restore_old_callbacks(transport, sk);
a246b010
CL		 863 write_unlock_bh(&sk->sk_callback_lock);
864
9903cd1c 865 sk->sk_no_check = 0;
a246b010 866
40b5ea0c 867 trace_rpc_socket_close(&transport->xprt, sock);
a246b010 868 sock_release(sock);
fe315e76
CL		 869}
870
871/**
872 * xs_close - close a socket
873 * @xprt: transport
874 *
875 * This is used when all requests are complete; ie, no DRC state remains
876 * on the server we want to save.
f75e6745
TM		 877 *
878 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
879 * xs_reset_transport() zeroing the socket from underneath a writer.
fe315e76
CL		 880 */
881static void xs_close(struct rpc_xprt *xprt)
882{
883 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
884
885 dprintk("RPC: xs_close xprt %p\n", xprt);
886
93dc41bd
N		 887 cancel_delayed_work_sync(&transport->connect_worker);
888
fe315e76 889 xs_reset_transport(transport);
61d0a8e6 890 xprt->reestablish_timeout = 0;
fe315e76 891
632e3bdc 892 smp_mb__before_clear_bit();
7d1e8255 893 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
632e3bdc 894 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 895 clear_bit(XPRT_CLOSING, &xprt->state);
632e3bdc 896 smp_mb__after_clear_bit();
62da3b24 897 xprt_disconnect_done(xprt);
a246b010
CL		 898}
899
f75e6745
TM		 900static void xs_tcp_close(struct rpc_xprt *xprt)
901{
902 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
903 xs_close(xprt);
904 else
905 xs_tcp_shutdown(xprt);
906}
907
9903cd1c
CL		 908/**
909 * xs_destroy - prepare to shutdown a transport
910 * @xprt: doomed transport
911 *
912 */
913static void xs_destroy(struct rpc_xprt *xprt)
a246b010 914{
46121cf7 915 dprintk("RPC: xs_destroy xprt %p\n", xprt);
9903cd1c 916
a1311d87
TM		 917 xs_close(xprt);
918 xs_free_peer_addresses(xprt);
919 xprt_free(xprt);
920 module_put(THIS_MODULE);
a246b010
CL		 921}
922
176e21ee
CL		 923static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
924{
925 struct xdr_skb_reader desc = {
926 .skb = skb,
927 .offset = sizeof(rpc_fraghdr),
928 .count = skb->len - sizeof(rpc_fraghdr),
929 };
930
931 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
932 return -1;
933 if (desc.count)
934 return -1;
935 return 0;
936}
937
938/**
939 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
940 * @sk: socket with data to read
941 * @len: how much data to read
942 *
943 * Currently this assumes we can read the whole reply in a single gulp.
944 */
945static void xs_local_data_ready(struct sock *sk, int len)
946{
947 struct rpc_task *task;
948 struct rpc_xprt *xprt;
949 struct rpc_rqst *rovr;
950 struct sk_buff *skb;
951 int err, repsize, copied;
952 u32 _xid;
953 __be32 *xp;
954
955 read_lock_bh(&sk->sk_callback_lock);
956 dprintk("RPC: %s...\n", __func__);
957 xprt = xprt_from_sock(sk);
958 if (xprt == NULL)
959 goto out;
960
961 skb = skb_recv_datagram(sk, 0, 1, &err);
962 if (skb == NULL)
963 goto out;
964
176e21ee
CL		 965 repsize = skb->len - sizeof(rpc_fraghdr);
966 if (repsize < 4) {
967 dprintk("RPC: impossible RPC reply size %d\n", repsize);
968 goto dropit;
969 }
970
971 /* Copy the XID from the skb... */
972 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
973 if (xp == NULL)
974 goto dropit;
975
976 /* Look up and lock the request corresponding to the given XID */
977 spin_lock(&xprt->transport_lock);
978 rovr = xprt_lookup_rqst(xprt, *xp);
979 if (!rovr)
980 goto out_unlock;
981 task = rovr->rq_task;
982
983 copied = rovr->rq_private_buf.buflen;
984 if (copied > repsize)
985 copied = repsize;
986
987 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
988 dprintk("RPC: sk_buff copy failed\n");
989 goto out_unlock;
990 }
991
992 xprt_complete_rqst(task, copied);
993
994 out_unlock:
995 spin_unlock(&xprt->transport_lock);
996 dropit:
997 skb_free_datagram(sk, skb);
998 out:
999 read_unlock_bh(&sk->sk_callback_lock);
1000}
1001
9903cd1c
CL		 1002/**
1003 * xs_udp_data_ready - "data ready" callback for UDP sockets
1004 * @sk: socket with data to read
1005 * @len: how much data to read
1006 *
a246b010 1007 */
9903cd1c 1008static void xs_udp_data_ready(struct sock *sk, int len)
a246b010 1009{
9903cd1c
CL		 1010 struct rpc_task *task;
1011 struct rpc_xprt *xprt;
a246b010 1012 struct rpc_rqst *rovr;
9903cd1c 1013 struct sk_buff *skb;
a246b010 1014 int err, repsize, copied;
d8ed029d
AD		 1015 u32 _xid;
1016 __be32 *xp;
a246b010 1017
f064af1e 1018 read_lock_bh(&sk->sk_callback_lock);
46121cf7 1019 dprintk("RPC: xs_udp_data_ready...\n");
9903cd1c 1020 if (!(xprt = xprt_from_sock(sk)))
a246b010 1021 goto out;
a246b010
CL		 1022
1023 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1024 goto out;
1025
a246b010
CL		 1026 repsize = skb->len - sizeof(struct udphdr);
1027 if (repsize < 4) {
46121cf7 1028 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
a246b010
CL		 1029 goto dropit;
1030 }
1031
1032 /* Copy the XID from the skb... */
1033 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1034 sizeof(_xid), &_xid);
1035 if (xp == NULL)
1036 goto dropit;
1037
1038 /* Look up and lock the request corresponding to the given XID */
4a0f8c04 1039 spin_lock(&xprt->transport_lock);
a246b010
CL		 1040 rovr = xprt_lookup_rqst(xprt, *xp);
1041 if (!rovr)
1042 goto out_unlock;
1043 task = rovr->rq_task;
1044
a246b010
CL		 1045 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1046 copied = repsize;
1047
1048 /* Suck it into the iovec, verify checksum if not done by hw. */
1781f7f5
HX		 1049 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1050 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
a246b010 1051 goto out_unlock;
1781f7f5
HX		 1052 }
1053
1054 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
a246b010 1055
6a24dfb6 1056 xprt_adjust_cwnd(xprt, task, copied);
1570c1e4 1057 xprt_complete_rqst(task, copied);
a246b010
CL		 1058
1059 out_unlock:
4a0f8c04 1060 spin_unlock(&xprt->transport_lock);
a246b010
CL		 1061 dropit:
1062 skb_free_datagram(sk, skb);
1063 out:
f064af1e 1064 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1065}
1066
a519fc7a
TM		 1067/*
1068 * Helper function to force a TCP close if the server is sending
1069 * junk and/or it has put us in CLOSE_WAIT
1070 */
1071static void xs_tcp_force_close(struct rpc_xprt *xprt)
1072{
1073 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1074 xprt_force_disconnect(xprt);
1075}
1076
dd456471 1077static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
a246b010 1078{
51971139 1079 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1080 size_t len, used;
1081 char *p;
1082
51971139
CL		 1083 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1084 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
9d292316 1085 used = xdr_skb_read_bits(desc, p, len);
51971139 1086 transport->tcp_offset += used;
a246b010
CL		 1087 if (used != len)
1088 return;
808012fb 1089
51971139
CL		 1090 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1091 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
e136d092 1092 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
a246b010 1093 else
e136d092 1094 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
51971139 1095 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
808012fb 1096
e136d092 1097 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
51971139 1098 transport->tcp_offset = 0;
808012fb 1099
a246b010 1100 /* Sanity check of the record length */
18dca02a 1101 if (unlikely(transport->tcp_reclen < 8)) {
46121cf7 1102 dprintk("RPC: invalid TCP record fragment length\n");
a519fc7a 1103 xs_tcp_force_close(xprt);
9903cd1c 1104 return;
a246b010 1105 }
46121cf7 1106 dprintk("RPC: reading TCP record fragment of length %d\n",
51971139 1107 transport->tcp_reclen);
a246b010
CL		 1108}
1109
51971139 1110static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
a246b010 1111{
51971139 1112 if (transport->tcp_offset == transport->tcp_reclen) {
e136d092 1113 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
51971139 1114 transport->tcp_offset = 0;
e136d092
CL		 1115 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1116 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1117 transport->tcp_flags |= TCP_RCV_COPY_XID;
51971139 1118 transport->tcp_copied = 0;
a246b010
CL		 1119 }
1120 }
1121}
1122
dd456471 1123static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1124{
1125 size_t len, used;
1126 char *p;
1127
51971139 1128 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
46121cf7 1129 dprintk("RPC: reading XID (%Zu bytes)\n", len);
51971139 1130 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
9d292316 1131 used = xdr_skb_read_bits(desc, p, len);
51971139 1132 transport->tcp_offset += used;
a246b010
CL		 1133 if (used != len)
1134 return;
e136d092 1135 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
f4a2e418 1136 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
51971139 1137 transport->tcp_copied = 4;
18dca02a
RL		 1138 dprintk("RPC: reading %s XID %08x\n",
1139 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1140 : "request with",
51971139
CL		 1141 ntohl(transport->tcp_xid));
1142 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1143}
1144
18dca02a
RL		 1145static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1146 struct xdr_skb_reader *desc)
a246b010 1147{
18dca02a
RL		 1148 size_t len, used;
1149 u32 offset;
b76ce561 1150 char *p;
18dca02a
RL		 1151
1152 /*
1153 * We want transport->tcp_offset to be 8 at the end of this routine
1154 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1155 * When this function is called for the first time,
1156 * transport->tcp_offset is 4 (after having already read the xid).
1157 */
1158 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
b76ce561 1159 len = sizeof(transport->tcp_calldir) - offset;
18dca02a 1160 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
b76ce561
TM		 1161 p = ((char *) &transport->tcp_calldir) + offset;
1162 used = xdr_skb_read_bits(desc, p, len);
18dca02a
RL		 1163 transport->tcp_offset += used;
1164 if (used != len)
1165 return;
f4a2e418 1166 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
f4a2e418
RL		 1167 /*
1168 * We don't yet have the XDR buffer, so we will write the calldir
1169 * out after we get the buffer from the 'struct rpc_rqst'
1170 */
b76ce561
TM		 1171 switch (ntohl(transport->tcp_calldir)) {
1172 case RPC_REPLY:
1173 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1174 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1175 transport->tcp_flags |= TCP_RPC_REPLY;
b76ce561
TM		 1176 break;
1177 case RPC_CALL:
1178 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1179 transport->tcp_flags |= TCP_RCV_COPY_DATA;
18dca02a 1180 transport->tcp_flags &= ~TCP_RPC_REPLY;
b76ce561
TM		 1181 break;
1182 default:
1183 dprintk("RPC: invalid request message type\n");
a519fc7a 1184 xs_tcp_force_close(&transport->xprt);
b76ce561 1185 }
18dca02a
RL		 1186 xs_tcp_check_fraghdr(transport);
1187}
1188
44b98efd
RL		 1189static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1190 struct xdr_skb_reader *desc,
1191 struct rpc_rqst *req)
a246b010 1192{
44b98efd
RL		 1193 struct sock_xprt *transport =
1194 container_of(xprt, struct sock_xprt, xprt);
a246b010
CL		 1195 struct xdr_buf *rcvbuf;
1196 size_t len;
1197 ssize_t r;
1198
a246b010 1199 rcvbuf = &req->rq_private_buf;
f4a2e418
RL		 1200
1201 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1202 /*
1203 * Save the RPC direction in the XDR buffer
1204 */
f4a2e418 1205 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
b76ce561
TM		 1206 &transport->tcp_calldir,
1207 sizeof(transport->tcp_calldir));
1208 transport->tcp_copied += sizeof(transport->tcp_calldir);
f4a2e418 1209 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
a246b010
CL		 1210 }
1211
a246b010 1212 len = desc->count;
51971139 1213 if (len > transport->tcp_reclen - transport->tcp_offset) {
dd456471 1214 struct xdr_skb_reader my_desc;
a246b010 1215
51971139 1216 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1217 memcpy(&my_desc, desc, sizeof(my_desc));
1218 my_desc.count = len;
51971139 1219 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1220 &my_desc, xdr_skb_read_bits);
a246b010
CL		 1221 desc->count -= r;
1222 desc->offset += r;
1223 } else
51971139 1224 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
9d292316 1225 desc, xdr_skb_read_bits);
a246b010
CL		 1226
1227 if (r > 0) {
51971139
CL		 1228 transport->tcp_copied += r;
1229 transport->tcp_offset += r;
a246b010
CL		 1230 }
1231 if (r != len) {
1232 /* Error when copying to the receive buffer,
1233 * usually because we weren't able to allocate
1234 * additional buffer pages. All we can do now
e136d092 1235 * is turn off TCP_RCV_COPY_DATA, so the request
a246b010
CL		 1236 * will not receive any additional updates,
1237 * and time out.
1238 * Any remaining data from this record will
1239 * be discarded.
1240 */
e136d092 1241 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
46121cf7 1242 dprintk("RPC: XID %08x truncated request\n",
51971139 1243 ntohl(transport->tcp_xid));
46121cf7
CL		 1244 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1245 "tcp_offset = %u, tcp_reclen = %u\n",
1246 xprt, transport->tcp_copied,
1247 transport->tcp_offset, transport->tcp_reclen);
44b98efd 1248 return;
a246b010
CL		 1249 }
1250
46121cf7 1251 dprintk("RPC: XID %08x read %Zd bytes\n",
51971139 1252 ntohl(transport->tcp_xid), r);
46121cf7
CL		 1253 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1254 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1255 transport->tcp_offset, transport->tcp_reclen);
51971139
CL		 1256
1257 if (transport->tcp_copied == req->rq_private_buf.buflen)
e136d092 1258 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
51971139 1259 else if (transport->tcp_offset == transport->tcp_reclen) {
e136d092
CL		 1260 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1261 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
a246b010 1262 }
44b98efd
RL		 1263}
1264
1265/*
1266 * Finds the request corresponding to the RPC xid and invokes the common
1267 * tcp read code to read the data.
1268 */
1269static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1270 struct xdr_skb_reader *desc)
1271{
1272 struct sock_xprt *transport =
1273 container_of(xprt, struct sock_xprt, xprt);
1274 struct rpc_rqst *req;
1275
1276 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1277
1278 /* Find and lock the request corresponding to this xid */
1279 spin_lock(&xprt->transport_lock);
1280 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1281 if (!req) {
1282 dprintk("RPC: XID %08x request not found!\n",
1283 ntohl(transport->tcp_xid));
1284 spin_unlock(&xprt->transport_lock);
1285 return -1;
1286 }
1287
1288 xs_tcp_read_common(xprt, desc, req);
1289
e136d092 1290 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
51971139 1291 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
44b98efd 1292
4a0f8c04 1293 spin_unlock(&xprt->transport_lock);
44b98efd
RL		 1294 return 0;
1295}
1296
9e00abc3 1297#if defined(CONFIG_SUNRPC_BACKCHANNEL)
44b98efd
RL		 1298/*
1299 * Obtains an rpc_rqst previously allocated and invokes the common
1300 * tcp read code to read the data. The result is placed in the callback
1301 * queue.
1302 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1303 * connection and return -1.
1304 */
1305static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1306 struct xdr_skb_reader *desc)
1307{
1308 struct sock_xprt *transport =
1309 container_of(xprt, struct sock_xprt, xprt);
1310 struct rpc_rqst *req;
1311
1312 req = xprt_alloc_bc_request(xprt);
1313 if (req == NULL) {
1314 printk(KERN_WARNING "Callback slot table overflowed\n");
1315 xprt_force_disconnect(xprt);
1316 return -1;
1317 }
1318
1319 req->rq_xid = transport->tcp_xid;
1320 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1321 xs_tcp_read_common(xprt, desc, req);
1322
1323 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1324 struct svc_serv *bc_serv = xprt->bc_serv;
1325
1326 /*
1327 * Add callback request to callback list. The callback
1328 * service sleeps on the sv_cb_waitq waiting for new
1329 * requests. Wake it up after adding enqueing the
1330 * request.
1331 */
1332 dprintk("RPC: add callback request to list\n");
1333 spin_lock(&bc_serv->sv_cb_lock);
1334 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1335 spin_unlock(&bc_serv->sv_cb_lock);
1336 wake_up(&bc_serv->sv_cb_waitq);
1337 }
1338
1339 req->rq_private_buf.len = transport->tcp_copied;
1340
1341 return 0;
1342}
1343
1344static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1345 struct xdr_skb_reader *desc)
1346{
1347 struct sock_xprt *transport =
1348 container_of(xprt, struct sock_xprt, xprt);
1349
1350 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1351 xs_tcp_read_reply(xprt, desc) :
1352 xs_tcp_read_callback(xprt, desc);
1353}
1354#else
1355static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1356 struct xdr_skb_reader *desc)
1357{
1358 return xs_tcp_read_reply(xprt, desc);
1359}
9e00abc3 1360#endif /* CONFIG_SUNRPC_BACKCHANNEL */
44b98efd
RL		 1361
1362/*
1363 * Read data off the transport. This can be either an RPC_CALL or an
1364 * RPC_REPLY. Relay the processing to helper functions.
1365 */
1366static void xs_tcp_read_data(struct rpc_xprt *xprt,
1367 struct xdr_skb_reader *desc)
1368{
1369 struct sock_xprt *transport =
1370 container_of(xprt, struct sock_xprt, xprt);
1371
1372 if (_xs_tcp_read_data(xprt, desc) == 0)
1373 xs_tcp_check_fraghdr(transport);
1374 else {
1375 /*
1376 * The transport_lock protects the request handling.
1377 * There's no need to hold it to update the tcp_flags.
1378 */
1379 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1380 }
a246b010
CL		 1381}
1382
dd456471 1383static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
a246b010
CL		 1384{
1385 size_t len;
1386
51971139 1387 len = transport->tcp_reclen - transport->tcp_offset;
a246b010
CL		 1388 if (len > desc->count)
1389 len = desc->count;
1390 desc->count -= len;
1391 desc->offset += len;
51971139 1392 transport->tcp_offset += len;
46121cf7 1393 dprintk("RPC: discarded %Zu bytes\n", len);
51971139 1394 xs_tcp_check_fraghdr(transport);
a246b010
CL		 1395}
1396
9903cd1c 1397static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
a246b010
CL		 1398{
1399 struct rpc_xprt *xprt = rd_desc->arg.data;
51971139 1400 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
dd456471 1401 struct xdr_skb_reader desc = {
a246b010
CL		 1402 .skb = skb,
1403 .offset = offset,
1404 .count = len,
9903cd1c 1405 };
a246b010 1406
46121cf7 1407 dprintk("RPC: xs_tcp_data_recv started\n");
a246b010
CL		 1408 do {
1409 /* Read in a new fragment marker if necessary */
1410 /* Can we ever really expect to get completely empty fragments? */
e136d092 1411 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
9903cd1c 1412 xs_tcp_read_fraghdr(xprt, &desc);
a246b010
CL		 1413 continue;
1414 }
1415 /* Read in the xid if necessary */
e136d092 1416 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
51971139 1417 xs_tcp_read_xid(transport, &desc);
a246b010
CL		 1418 continue;
1419 }
18dca02a 1420 /* Read in the call/reply flag */
f4a2e418 1421 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
18dca02a
RL		 1422 xs_tcp_read_calldir(transport, &desc);
1423 continue;
1424 }
a246b010 1425 /* Read in the request data */
e136d092 1426 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
44b98efd 1427 xs_tcp_read_data(xprt, &desc);
a246b010
CL		 1428 continue;
1429 }
1430 /* Skip over any trailing bytes on short reads */
51971139 1431 xs_tcp_read_discard(transport, &desc);
a246b010 1432 } while (desc.count);
46121cf7 1433 dprintk("RPC: xs_tcp_data_recv done\n");
a246b010
CL		 1434 return len - desc.count;
1435}
1436
9903cd1c
CL		 1437/**
1438 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1439 * @sk: socket with data to read
1440 * @bytes: how much data to read
1441 *
1442 */
1443static void xs_tcp_data_ready(struct sock *sk, int bytes)
a246b010
CL		 1444{
1445 struct rpc_xprt *xprt;
1446 read_descriptor_t rd_desc;
ff2d7db8 1447 int read;
a246b010 1448
46121cf7
CL		 1449 dprintk("RPC: xs_tcp_data_ready...\n");
1450
f064af1e 1451 read_lock_bh(&sk->sk_callback_lock);
9903cd1c 1452 if (!(xprt = xprt_from_sock(sk)))
a246b010 1453 goto out;
61d0a8e6
NB		 1454 /* Any data means we had a useful conversation, so
1455 * the we don't need to delay the next reconnect
1456 */
1457 if (xprt->reestablish_timeout)
1458 xprt->reestablish_timeout = 0;
1459
9903cd1c 1460 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
a246b010 1461 rd_desc.arg.data = xprt;
ff2d7db8
TM		 1462 do {
1463 rd_desc.count = 65536;
1464 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1465 } while (read > 0);
a246b010 1466out:
f064af1e 1467 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1468}
1469
7d1e8255
TM		 1470/*
1471 * Do the equivalent of linger/linger2 handling for dealing with
1472 * broken servers that don't close the socket in a timely
1473 * fashion
1474 */
1475static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1476 unsigned long timeout)
1477{
1478 struct sock_xprt *transport;
1479
1480 if (xprt_test_and_set_connecting(xprt))
1481 return;
1482 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1483 transport = container_of(xprt, struct sock_xprt, xprt);
1484 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1485 timeout);
1486}
1487
1488static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1489{
1490 struct sock_xprt *transport;
1491
1492 transport = container_of(xprt, struct sock_xprt, xprt);
1493
1494 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1495 !cancel_delayed_work(&transport->connect_worker))
1496 return;
1497 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1498 xprt_clear_connecting(xprt);
1499}
1500
4bc1e68e 1501static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
7d1e8255
TM		 1502{
1503 smp_mb__before_clear_bit();
a519fc7a
TM		 1504 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1505 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
7d1e8255
TM		 1506 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1507 clear_bit(XPRT_CLOSING, &xprt->state);
1508 smp_mb__after_clear_bit();
4bc1e68e
TM		 1509}
1510
1511static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1512{
1513 xs_sock_reset_connection_flags(xprt);
7d1e8255
TM		 1514 /* Mark transport as closed and wake up all pending tasks */
1515 xprt_disconnect_done(xprt);
1516}
1517
9903cd1c
CL		 1518/**
1519 * xs_tcp_state_change - callback to handle TCP socket state changes
1520 * @sk: socket whose state has changed
1521 *
1522 */
1523static void xs_tcp_state_change(struct sock *sk)
a246b010 1524{
9903cd1c 1525 struct rpc_xprt *xprt;
a246b010 1526
f064af1e 1527 read_lock_bh(&sk->sk_callback_lock);
a246b010
CL		 1528 if (!(xprt = xprt_from_sock(sk)))
1529 goto out;
46121cf7 1530 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
669502ff 1531 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
46121cf7
CL		 1532 sk->sk_state, xprt_connected(xprt),
1533 sock_flag(sk, SOCK_DEAD),
669502ff
AC		 1534 sock_flag(sk, SOCK_ZAPPED),
1535 sk->sk_shutdown);
a246b010 1536
40b5ea0c 1537 trace_rpc_socket_state_change(xprt, sk->sk_socket);
a246b010
CL		 1538 switch (sk->sk_state) {
1539 case TCP_ESTABLISHED:
f064af1e 1540 spin_lock(&xprt->transport_lock);
a246b010 1541 if (!xprt_test_and_set_connected(xprt)) {
51971139
CL		 1542 struct sock_xprt *transport = container_of(xprt,
1543 struct sock_xprt, xprt);
1544
a246b010 1545 /* Reset TCP record info */
51971139
CL		 1546 transport->tcp_offset = 0;
1547 transport->tcp_reclen = 0;
1548 transport->tcp_copied = 0;
e136d092
CL		 1549 transport->tcp_flags =
1550 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
8b71798c 1551 xprt->connect_cookie++;
51971139 1552
2a491991 1553 xprt_wake_pending_tasks(xprt, -EAGAIN);
a246b010 1554 }
f064af1e 1555 spin_unlock(&xprt->transport_lock);
a246b010 1556 break;
3b948ae5
TM		 1557 case TCP_FIN_WAIT1:
1558 /* The client initiated a shutdown of the socket */
7c1d71cf 1559 xprt->connect_cookie++;
663b8858 1560 xprt->reestablish_timeout = 0;
3b948ae5
TM		 1561 set_bit(XPRT_CLOSING, &xprt->state);
1562 smp_mb__before_clear_bit();
1563 clear_bit(XPRT_CONNECTED, &xprt->state);
ef803670 1564 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
3b948ae5 1565 smp_mb__after_clear_bit();
25fe6142 1566 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
a246b010 1567 break;
632e3bdc 1568 case TCP_CLOSE_WAIT:
3b948ae5 1569 /* The server initiated a shutdown of the socket */
7c1d71cf 1570 xprt->connect_cookie++;
d0bea455 1571 clear_bit(XPRT_CONNECTED, &xprt->state);
a519fc7a 1572 xs_tcp_force_close(xprt);
663b8858
TM		 1573 case TCP_CLOSING:
1574 /*
1575 * If the server closed down the connection, make sure that
1576 * we back off before reconnecting
1577 */
1578 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1579 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3b948ae5
TM		 1580 break;
1581 case TCP_LAST_ACK:
670f9457 1582 set_bit(XPRT_CLOSING, &xprt->state);
25fe6142 1583 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
3b948ae5
TM		 1584 smp_mb__before_clear_bit();
1585 clear_bit(XPRT_CONNECTED, &xprt->state);
1586 smp_mb__after_clear_bit();
1587 break;
1588 case TCP_CLOSE:
7d1e8255
TM		 1589 xs_tcp_cancel_linger_timeout(xprt);
1590 xs_sock_mark_closed(xprt);
a246b010
CL		 1591 }
1592 out:
f064af1e 1593 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1594}
1595
1f0fa154
IJ		 1596static void xs_write_space(struct sock *sk)
1597{
1598 struct socket *sock;
1599 struct rpc_xprt *xprt;
1600
1601 if (unlikely(!(sock = sk->sk_socket)))
1602 return;
1603 clear_bit(SOCK_NOSPACE, &sock->flags);
1604
1605 if (unlikely(!(xprt = xprt_from_sock(sk))))
1606 return;
1607 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1608 return;
1609
1610 xprt_write_space(xprt);
1611}
1612
9903cd1c 1613/**
c7b2cae8
CL		 1614 * xs_udp_write_space - callback invoked when socket buffer space
1615 * becomes available
9903cd1c
CL		 1616 * @sk: socket whose state has changed
1617 *
a246b010
CL		 1618 * Called when more output buffer space is available for this socket.
1619 * We try not to wake our writers until they can make "significant"
c7b2cae8 1620 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
a246b010
CL		 1621 * with a bunch of small requests.
1622 */
c7b2cae8 1623static void xs_udp_write_space(struct sock *sk)
a246b010 1624{
f064af1e 1625 read_lock_bh(&sk->sk_callback_lock);
a246b010 1626
c7b2cae8 1627 /* from net/core/sock.c:sock_def_write_space */
1f0fa154
IJ		 1628 if (sock_writeable(sk))
1629 xs_write_space(sk);
a246b010 1630
f064af1e 1631 read_unlock_bh(&sk->sk_callback_lock);
c7b2cae8 1632}
a246b010 1633
c7b2cae8
CL		 1634/**
1635 * xs_tcp_write_space - callback invoked when socket buffer space
1636 * becomes available
1637 * @sk: socket whose state has changed
1638 *
1639 * Called when more output buffer space is available for this socket.
1640 * We try not to wake our writers until they can make "significant"
1641 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1642 * with a bunch of small requests.
1643 */
1644static void xs_tcp_write_space(struct sock *sk)
1645{
f064af1e 1646 read_lock_bh(&sk->sk_callback_lock);
c7b2cae8
CL		 1647
1648 /* from net/core/stream.c:sk_stream_write_space */
64dc6130 1649 if (sk_stream_is_writeable(sk))
1f0fa154 1650 xs_write_space(sk);
b6ddf64f 1651
f064af1e 1652 read_unlock_bh(&sk->sk_callback_lock);
a246b010
CL		 1653}
1654
470056c2 1655static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
a246b010 1656{
ee0ac0c2
CL		 1657 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1658 struct sock *sk = transport->inet;
a246b010 1659
7c6e066e 1660 if (transport->rcvsize) {
a246b010 1661 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
7c6e066e 1662 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
a246b010 1663 }
7c6e066e 1664 if (transport->sndsize) {
a246b010 1665 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
7c6e066e 1666 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
a246b010
CL		 1667 sk->sk_write_space(sk);
1668 }
1669}
1670
43118c29 1671/**
470056c2 1672 * xs_udp_set_buffer_size - set send and receive limits
43118c29 1673 * @xprt: generic transport
470056c2
CL		 1674 * @sndsize: requested size of send buffer, in bytes
1675 * @rcvsize: requested size of receive buffer, in bytes
43118c29 1676 *
470056c2 1677 * Set socket send and receive buffer size limits.
43118c29 1678 */
470056c2 1679static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
43118c29 1680{
7c6e066e
CL		 1681 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1682
1683 transport->sndsize = 0;
470056c2 1684 if (sndsize)
7c6e066e
CL		 1685 transport->sndsize = sndsize + 1024;
1686 transport->rcvsize = 0;
470056c2 1687 if (rcvsize)
7c6e066e 1688 transport->rcvsize = rcvsize + 1024;
470056c2
CL		 1689
1690 xs_udp_do_set_buffer_size(xprt);
43118c29
CL		 1691}
1692
46c0ee8b
CL		 1693/**
1694 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1695 * @task: task that timed out
1696 *
1697 * Adjust the congestion window after a retransmit timeout has occurred.
1698 */
6a24dfb6 1699static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
46c0ee8b 1700{
6a24dfb6 1701 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
46c0ee8b
CL		 1702}
1703
b85d8806
CL		 1704static unsigned short xs_get_random_port(void)
1705{
1706 unsigned short range = xprt_max_resvport - xprt_min_resvport;
63862b5b 1707 unsigned short rand = (unsigned short) prandom_u32() % range;
b85d8806
CL		 1708 return rand + xprt_min_resvport;
1709}
1710
92200412
CL		 1711/**
1712 * xs_set_port - reset the port number in the remote endpoint address
1713 * @xprt: generic transport
1714 * @port: new port number
1715 *
1716 */
1717static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1718{
46121cf7 1719 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
c4efcb1d 1720
9dc3b095
CL		 1721 rpc_set_port(xs_addr(xprt), port);
1722 xs_update_peer_port(xprt);
92200412
CL		 1723}
1724
5d4ec932 1725static unsigned short xs_get_srcport(struct sock_xprt *transport)
67a391d7 1726{
fbfffbd5 1727 unsigned short port = transport->srcport;
67a391d7
TM		 1728
1729 if (port == 0 && transport->xprt.resvport)
1730 port = xs_get_random_port();
1731 return port;
1732}
1733
baaf4e48 1734static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
67a391d7 1735{
fbfffbd5
CL		 1736 if (transport->srcport != 0)
1737 transport->srcport = 0;
67a391d7
TM		 1738 if (!transport->xprt.resvport)
1739 return 0;
1740 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1741 return xprt_max_resvport;
1742 return --port;
1743}
beb59b68 1744static int xs_bind(struct sock_xprt *transport, struct socket *sock)
a246b010 1745{
beb59b68 1746 struct sockaddr_storage myaddr;
67a391d7 1747 int err, nloop = 0;
5d4ec932 1748 unsigned short port = xs_get_srcport(transport);
67a391d7 1749 unsigned short last;
a246b010 1750
beb59b68 1751 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
a246b010 1752 do {
beb59b68
PE		 1753 rpc_set_port((struct sockaddr *)&myaddr, port);
1754 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1755 transport->xprt.addrlen);
67a391d7 1756 if (port == 0)
d3bc9a1d 1757 break;
a246b010 1758 if (err == 0) {
fbfffbd5 1759 transport->srcport = port;
d3bc9a1d 1760 break;
a246b010 1761 }
67a391d7 1762 last = port;
baaf4e48 1763 port = xs_next_srcport(transport, port);
67a391d7
TM		 1764 if (port > last)
1765 nloop++;
1766 } while (err == -EADDRINUSE && nloop != 2);
90058d37 1767
4232e863 1768 if (myaddr.ss_family == AF_INET)
beb59b68
PE		 1769 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1770 &((struct sockaddr_in *)&myaddr)->sin_addr,
1771 port, err ? "failed" : "ok", err);
1772 else
1773 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1774 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1775 port, err ? "failed" : "ok", err);
a246b010
CL		 1776 return err;
1777}
1778
176e21ee
CL		 1779/*
1780 * We don't support autobind on AF_LOCAL sockets
1781 */
1782static void xs_local_rpcbind(struct rpc_task *task)
1783{
3dc0da27
TM		 1784 rcu_read_lock();
1785 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1786 rcu_read_unlock();
176e21ee
CL		 1787}
1788
1789static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1790{
1791}
beb59b68 1792
ed07536e
PZ		 1793#ifdef CONFIG_DEBUG_LOCK_ALLOC
1794static struct lock_class_key xs_key[2];
1795static struct lock_class_key xs_slock_key[2];
1796
176e21ee
CL		 1797static inline void xs_reclassify_socketu(struct socket *sock)
1798{
1799 struct sock *sk = sock->sk;
1800
176e21ee
CL		 1801 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1802 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1803}
1804
8945ee5e 1805static inline void xs_reclassify_socket4(struct socket *sock)
ed07536e
PZ		 1806{
1807 struct sock *sk = sock->sk;
8945ee5e 1808
8945ee5e
CL		 1809 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1810 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1811}
ed07536e 1812
8945ee5e
CL		 1813static inline void xs_reclassify_socket6(struct socket *sock)
1814{
1815 struct sock *sk = sock->sk;
ed07536e 1816
8945ee5e
CL		 1817 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1818 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
ed07536e 1819}
6bc9638a
PE		 1820
1821static inline void xs_reclassify_socket(int family, struct socket *sock)
1822{
1b7a1819
WAA		 1823 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1824 if (sock_owned_by_user(sock->sk))
1825 return;
1826
4232e863 1827 switch (family) {
176e21ee
CL		 1828 case AF_LOCAL:
1829 xs_reclassify_socketu(sock);
1830 break;
4232e863 1831 case AF_INET:
6bc9638a 1832 xs_reclassify_socket4(sock);
4232e863
CL		 1833 break;
1834 case AF_INET6:
6bc9638a 1835 xs_reclassify_socket6(sock);
4232e863
CL		 1836 break;
1837 }
6bc9638a 1838}
ed07536e 1839#else
176e21ee
CL		 1840static inline void xs_reclassify_socketu(struct socket *sock)
1841{
1842}
1843
8945ee5e
CL		 1844static inline void xs_reclassify_socket4(struct socket *sock)
1845{
1846}
1847
1848static inline void xs_reclassify_socket6(struct socket *sock)
ed07536e
PZ		 1849{
1850}
6bc9638a
PE		 1851
1852static inline void xs_reclassify_socket(int family, struct socket *sock)
1853{
1854}
ed07536e
PZ		 1855#endif
1856
93dc41bd
N		 1857static void xs_dummy_setup_socket(struct work_struct *work)
1858{
1859}
1860
6bc9638a
PE		 1861static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1862 struct sock_xprt *transport, int family, int type, int protocol)
22f79326
PE		 1863{
1864 struct socket *sock;
1865 int err;
1866
6bc9638a 1867 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
22f79326
PE		 1868 if (err < 0) {
1869 dprintk("RPC: can't create %d transport socket (%d).\n",
1870 protocol, -err);
1871 goto out;
1872 }
6bc9638a 1873 xs_reclassify_socket(family, sock);
22f79326 1874
4cea288a
BH		 1875 err = xs_bind(transport, sock);
1876 if (err) {
22f79326
PE		 1877 sock_release(sock);
1878 goto out;
1879 }
1880
1881 return sock;
1882out:
1883 return ERR_PTR(err);
1884}
1885
176e21ee
CL		 1886static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1887 struct socket *sock)
1888{
1889 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1890 xprt);
1891
1892 if (!transport->inet) {
1893 struct sock *sk = sock->sk;
1894
1895 write_lock_bh(&sk->sk_callback_lock);
1896
1897 xs_save_old_callbacks(transport, sk);
1898
1899 sk->sk_user_data = xprt;
1900 sk->sk_data_ready = xs_local_data_ready;
1901 sk->sk_write_space = xs_udp_write_space;
2118071d 1902 sk->sk_error_report = xs_error_report;
176e21ee
CL		 1903 sk->sk_allocation = GFP_ATOMIC;
1904
1905 xprt_clear_connected(xprt);
1906
1907 /* Reset to new socket */
1908 transport->sock = sock;
1909 transport->inet = sk;
1910
1911 write_unlock_bh(&sk->sk_callback_lock);
1912 }
1913
1914 /* Tell the socket layer to start connecting... */
1915 xprt->stat.connect_count++;
1916 xprt->stat.connect_start = jiffies;
1917 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1918}
1919
1920/**
1921 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1922 * @xprt: RPC transport to connect
1923 * @transport: socket transport to connect
1924 * @create_sock: function to create a socket of the correct type
176e21ee 1925 */
dc107402 1926static int xs_local_setup_socket(struct sock_xprt *transport)
176e21ee 1927{
176e21ee
CL		 1928 struct rpc_xprt *xprt = &transport->xprt;
1929 struct socket *sock;
1930 int status = -EIO;
1931
5cf02d09
JL		 1932 current->flags |= PF_FSTRANS;
1933
176e21ee
CL		 1934 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1935 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1936 SOCK_STREAM, 0, &sock, 1);
1937 if (status < 0) {
1938 dprintk("RPC: can't create AF_LOCAL "
1939 "transport socket (%d).\n", -status);
1940 goto out;
1941 }
1942 xs_reclassify_socketu(sock);
1943
1944 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1945 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1946
1947 status = xs_local_finish_connecting(xprt, sock);
40b5ea0c 1948 trace_rpc_socket_connect(xprt, sock, status);
176e21ee
CL		 1949 switch (status) {
1950 case 0:
1951 dprintk("RPC: xprt %p connected to %s\n",
1952 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1953 xprt_set_connected(xprt);
1954 break;
1955 case -ENOENT:
1956 dprintk("RPC: xprt %p: socket %s does not exist\n",
1957 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1958 break;
4a20a988
TM		 1959 case -ECONNREFUSED:
1960 dprintk("RPC: xprt %p: connection refused for %s\n",
1961 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1962 break;
176e21ee
CL		 1963 default:
1964 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1965 __func__, -status,
1966 xprt->address_strings[RPC_DISPLAY_ADDR]);
1967 }
1968
1969out:
1970 xprt_clear_connecting(xprt);
1971 xprt_wake_pending_tasks(xprt, status);
5cf02d09 1972 current->flags &= ~PF_FSTRANS;
dc107402
BF		 1973 return status;
1974}
1975
b6669737 1976static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
dc107402 1977{
dc107402
BF		 1978 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1979 int ret;
1980
1981 if (RPC_IS_ASYNC(task)) {
1982 /*
1983 * We want the AF_LOCAL connect to be resolved in the
1984 * filesystem namespace of the process making the rpc
1985 * call. Thus we connect synchronously.
1986 *
1987 * If we want to support asynchronous AF_LOCAL calls,
1988 * we'll need to figure out how to pass a namespace to
1989 * connect.
1990 */
1991 rpc_exit(task, -ENOTCONN);
1992 return;
1993 }
1994 ret = xs_local_setup_socket(transport);
1995 if (ret && !RPC_IS_SOFTCONN(task))
1996 msleep_interruptible(15000);
176e21ee
CL		 1997}
1998
a564b8f0
MG		 1999#ifdef CONFIG_SUNRPC_SWAP
2000static void xs_set_memalloc(struct rpc_xprt *xprt)
2001{
2002 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2003 xprt);
2004
2005 if (xprt->swapper)
2006 sk_set_memalloc(transport->inet);
2007}
2008
2009/**
2010 * xs_swapper - Tag this transport as being used for swap.
2011 * @xprt: transport to tag
2012 * @enable: enable/disable
2013 *
2014 */
2015int xs_swapper(struct rpc_xprt *xprt, int enable)
2016{
2017 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2018 xprt);
2019 int err = 0;
2020
2021 if (enable) {
2022 xprt->swapper++;
2023 xs_set_memalloc(xprt);
2024 } else if (xprt->swapper) {
2025 xprt->swapper--;
2026 sk_clear_memalloc(transport->inet);
2027 }
2028
2029 return err;
2030}
2031EXPORT_SYMBOL_GPL(xs_swapper);
2032#else
2033static void xs_set_memalloc(struct rpc_xprt *xprt)
2034{
2035}
2036#endif
2037
16be2d20
CL		 2038static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2039{
2040 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2041
2042 if (!transport->inet) {
2043 struct sock *sk = sock->sk;
2044
2045 write_lock_bh(&sk->sk_callback_lock);
2046
2a9e1cfa
TM		 2047 xs_save_old_callbacks(transport, sk);
2048
16be2d20 2049 sk->sk_user_data = xprt;
16be2d20
CL		 2050 sk->sk_data_ready = xs_udp_data_ready;
2051 sk->sk_write_space = xs_udp_write_space;
2052 sk->sk_no_check = UDP_CSUM_NORCV;
2053 sk->sk_allocation = GFP_ATOMIC;
2054
2055 xprt_set_connected(xprt);
2056
2057 /* Reset to new socket */
2058 transport->sock = sock;
2059 transport->inet = sk;
2060
a564b8f0
MG		 2061 xs_set_memalloc(xprt);
2062
16be2d20
CL		 2063 write_unlock_bh(&sk->sk_callback_lock);
2064 }
2065 xs_udp_do_set_buffer_size(xprt);
2066}
2067
8c14ff2a 2068static void xs_udp_setup_socket(struct work_struct *work)
a246b010 2069{
34161db6
TM		 2070 struct sock_xprt *transport =
2071 container_of(work, struct sock_xprt, connect_worker.work);
c8475461 2072 struct rpc_xprt *xprt = &transport->xprt;
ee0ac0c2 2073 struct socket *sock = transport->sock;
b65c0310 2074 int status = -EIO;
9903cd1c 2075
5cf02d09
JL		 2076 current->flags |= PF_FSTRANS;
2077
b0d93ad5 2078 /* Start by resetting any existing state */
fe315e76 2079 xs_reset_transport(transport);
8c14ff2a
PE		 2080 sock = xs_create_sock(xprt, transport,
2081 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
b65c0310 2082 if (IS_ERR(sock))
b0d93ad5 2083 goto out;
68e220bd 2084
c740eff8
CL		 2085 dprintk("RPC: worker connecting xprt %p via %s to "
2086 "%s (port %s)\n", xprt,
2087 xprt->address_strings[RPC_DISPLAY_PROTO],
2088 xprt->address_strings[RPC_DISPLAY_ADDR],
2089 xprt->address_strings[RPC_DISPLAY_PORT]);
68e220bd
CL		 2090
2091 xs_udp_finish_connecting(xprt, sock);
40b5ea0c 2092 trace_rpc_socket_connect(xprt, sock, 0);
b0d93ad5
CL		 2093 status = 0;
2094out:
b0d93ad5 2095 xprt_clear_connecting(xprt);
7d1e8255 2096 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2097 current->flags &= ~PF_FSTRANS;
a246b010
CL		 2098}
2099
3167e12c
CL		 2100/*
2101 * We need to preserve the port number so the reply cache on the server can
2102 * find our cached RPC replies when we get around to reconnecting.
2103 */
58dddac9 2104static void xs_abort_connection(struct sock_xprt *transport)
3167e12c
CL		 2105{
2106 int result;
3167e12c
CL		 2107 struct sockaddr any;
2108
58dddac9 2109 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
3167e12c
CL		 2110
2111 /*
2112 * Disconnect the transport socket by doing a connect operation
2113 * with AF_UNSPEC. This should return immediately...
2114 */
2115 memset(&any, 0, sizeof(any));
2116 any.sa_family = AF_UNSPEC;
ee0ac0c2 2117 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
40b5ea0c
TM		 2118 trace_rpc_socket_reset_connection(&transport->xprt,
2119 transport->sock, result);
7d1e8255 2120 if (!result)
4bc1e68e
TM		 2121 xs_sock_reset_connection_flags(&transport->xprt);
2122 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
3167e12c
CL		 2123}
2124
58dddac9 2125static void xs_tcp_reuse_connection(struct sock_xprt *transport)
40d2549d
TM		 2126{
2127 unsigned int state = transport->inet->sk_state;
2128
669502ff
AC		 2129 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2130 /* we don't need to abort the connection if the socket
2131 * hasn't undergone a shutdown
2132 */
2133 if (transport->inet->sk_shutdown == 0)
2134 return;
2135 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2136 __func__, transport->inet->sk_shutdown);
2137 }
2138 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2139 /* we don't need to abort the connection if the socket
2140 * hasn't undergone a shutdown
2141 */
2142 if (transport->inet->sk_shutdown == 0)
2143 return;
2144 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2145 "sk_shutdown set to %d\n",
2146 __func__, transport->inet->sk_shutdown);
2147 }
58dddac9 2148 xs_abort_connection(transport);
40d2549d
TM		 2149}
2150
16be2d20 2151static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
a246b010 2152{
16be2d20 2153 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
fe19a96b 2154 int ret = -ENOTCONN;
edb267a6 2155
ee0ac0c2 2156 if (!transport->inet) {
b0d93ad5 2157 struct sock *sk = sock->sk;
7f260e85
TM		 2158 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2159 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2160 unsigned int opt_on = 1;
2161
2162 /* TCP Keepalive options */
2163 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2164 (char *)&opt_on, sizeof(opt_on));
2165 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2166 (char *)&keepidle, sizeof(keepidle));
2167 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2168 (char *)&keepidle, sizeof(keepidle));
2169 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2170 (char *)&keepcnt, sizeof(keepcnt));
b0d93ad5
CL		 2171
2172 write_lock_bh(&sk->sk_callback_lock);
2173
2a9e1cfa
TM		 2174 xs_save_old_callbacks(transport, sk);
2175
b0d93ad5 2176 sk->sk_user_data = xprt;
b0d93ad5
CL		 2177 sk->sk_data_ready = xs_tcp_data_ready;
2178 sk->sk_state_change = xs_tcp_state_change;
2179 sk->sk_write_space = xs_tcp_write_space;
2118071d 2180 sk->sk_error_report = xs_error_report;
b079fa7b 2181 sk->sk_allocation = GFP_ATOMIC;
3167e12c
CL		 2182
2183 /* socket options */
2184 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2185 sock_reset_flag(sk, SOCK_LINGER);
2186 tcp_sk(sk)->linger2 = 0;
2187 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
b0d93ad5
CL		 2188
2189 xprt_clear_connected(xprt);
2190
2191 /* Reset to new socket */
ee0ac0c2
CL		 2192 transport->sock = sock;
2193 transport->inet = sk;
b0d93ad5
CL		 2194
2195 write_unlock_bh(&sk->sk_callback_lock);
2196 }
2197
01d37c42 2198 if (!xprt_bound(xprt))
fe19a96b 2199 goto out;
01d37c42 2200
a564b8f0
MG		 2201 xs_set_memalloc(xprt);
2202
b0d93ad5 2203 /* Tell the socket layer to start connecting... */
262ca07d
CL		 2204 xprt->stat.connect_count++;
2205 xprt->stat.connect_start = jiffies;
fe19a96b
TM		 2206 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2207 switch (ret) {
2208 case 0:
2209 case -EINPROGRESS:
2210 /* SYN_SENT! */
fe19a96b
TM		 2211 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2212 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2213 }
2214out:
2215 return ret;
16be2d20
CL		 2216}
2217
9903cd1c 2218/**
b61d59ff
TM		 2219 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2220 * @xprt: RPC transport to connect
2221 * @transport: socket transport to connect
2222 * @create_sock: function to create a socket of the correct type
9903cd1c
CL		 2223 *
2224 * Invoked by a work queue tasklet.
a246b010 2225 */
cdd518d5 2226static void xs_tcp_setup_socket(struct work_struct *work)
a246b010 2227{
cdd518d5
PE		 2228 struct sock_xprt *transport =
2229 container_of(work, struct sock_xprt, connect_worker.work);
ee0ac0c2 2230 struct socket *sock = transport->sock;
a9f5f0f7 2231 struct rpc_xprt *xprt = &transport->xprt;
b61d59ff 2232 int status = -EIO;
a246b010 2233
5cf02d09
JL		 2234 current->flags |= PF_FSTRANS;
2235
ee0ac0c2 2236 if (!sock) {
7d1e8255 2237 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
cdd518d5
PE		 2238 sock = xs_create_sock(xprt, transport,
2239 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
b61d59ff
TM		 2240 if (IS_ERR(sock)) {
2241 status = PTR_ERR(sock);
3167e12c
CL		 2242 goto out;
2243 }
7d1e8255
TM		 2244 } else {
2245 int abort_and_exit;
a246b010 2246
7d1e8255
TM		 2247 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2248 &xprt->state);
3167e12c 2249 /* "close" the socket, preserving the local port */
58dddac9 2250 xs_tcp_reuse_connection(transport);
a246b010 2251
7d1e8255
TM		 2252 if (abort_and_exit)
2253 goto out_eagain;
2254 }
a246b010 2255
c740eff8
CL		 2256 dprintk("RPC: worker connecting xprt %p via %s to "
2257 "%s (port %s)\n", xprt,
2258 xprt->address_strings[RPC_DISPLAY_PROTO],
2259 xprt->address_strings[RPC_DISPLAY_ADDR],
2260 xprt->address_strings[RPC_DISPLAY_PORT]);
edb267a6 2261
16be2d20 2262 status = xs_tcp_finish_connecting(xprt, sock);
40b5ea0c 2263 trace_rpc_socket_connect(xprt, sock, status);
46121cf7
CL		 2264 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2265 xprt, -status, xprt_connected(xprt),
2266 sock->sk->sk_state);
2a491991 2267 switch (status) {
f75e6745
TM		 2268 default:
2269 printk("%s: connect returned unhandled error %d\n",
2270 __func__, status);
2271 case -EADDRNOTAVAIL:
2272 /* We're probably in TIME_WAIT. Get rid of existing socket,
2273 * and retry
2274 */
a519fc7a 2275 xs_tcp_force_close(xprt);
88b5ed73 2276 break;
2a491991
TM		 2277 case 0:
2278 case -EINPROGRESS:
2279 case -EALREADY:
7d1e8255 2280 xprt_clear_connecting(xprt);
5cf02d09 2281 current->flags &= ~PF_FSTRANS;
7d1e8255 2282 return;
9fcfe0c8
TM		 2283 case -EINVAL:
2284 /* Happens, for instance, if the user specified a link
2285 * local IPv6 address without a scope-id.
2286 */
3ed5e2a2
TM		 2287 case -ECONNREFUSED:
2288 case -ECONNRESET:
2289 case -ENETUNREACH:
2290 /* retry with existing socket, after a delay */
9fcfe0c8 2291 goto out;
a246b010 2292 }
7d1e8255 2293out_eagain:
2a491991 2294 status = -EAGAIN;
a246b010 2295out:
68e220bd 2296 xprt_clear_connecting(xprt);
7d1e8255 2297 xprt_wake_pending_tasks(xprt, status);
5cf02d09 2298 current->flags &= ~PF_FSTRANS;
68e220bd 2299}
b0d93ad5 2300
9903cd1c
CL		 2301/**
2302 * xs_connect - connect a socket to a remote endpoint
1b092092 2303 * @xprt: pointer to transport structure
9903cd1c
CL		 2304 * @task: address of RPC task that manages state of connect request
2305 *
2306 * TCP: If the remote end dropped the connection, delay reconnecting.
03bf4b70
CL		 2307 *
2308 * UDP socket connects are synchronous, but we use a work queue anyway
2309 * to guarantee that even unprivileged user processes can set up a
2310 * socket on a privileged port.
2311 *
2312 * If a UDP socket connect fails, the delay behavior here prevents
2313 * retry floods (hard mounts).
9903cd1c 2314 */
1b092092 2315static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
a246b010 2316{
ee0ac0c2 2317 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2318
09a21c41 2319 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
46121cf7
CL		 2320 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2321 "seconds\n",
03bf4b70 2322 xprt, xprt->reestablish_timeout / HZ);
c1384c9c
TM		 2323 queue_delayed_work(rpciod_workqueue,
2324 &transport->connect_worker,
2325 xprt->reestablish_timeout);
03bf4b70 2326 xprt->reestablish_timeout <<= 1;
61d0a8e6
NB		 2327 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2328 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
03bf4b70
CL		 2329 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2330 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
b0d93ad5 2331 } else {
46121cf7 2332 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
c1384c9c
TM		 2333 queue_delayed_work(rpciod_workqueue,
2334 &transport->connect_worker, 0);
a246b010
CL		 2335 }
2336}
2337
176e21ee
CL		 2338/**
2339 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2340 * @xprt: rpc_xprt struct containing statistics
2341 * @seq: output file
2342 *
2343 */
2344static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2345{
2346 long idle_time = 0;
2347
2348 if (xprt_connected(xprt))
2349 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2350
2351 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
15a45206 2352 "%llu %llu %lu %llu %llu\n",
176e21ee
CL		 2353 xprt->stat.bind_count,
2354 xprt->stat.connect_count,
2355 xprt->stat.connect_time,
2356 idle_time,
2357 xprt->stat.sends,
2358 xprt->stat.recvs,
2359 xprt->stat.bad_xids,
2360 xprt->stat.req_u,
15a45206
AA		 2361 xprt->stat.bklog_u,
2362 xprt->stat.max_slots,
2363 xprt->stat.sending_u,
2364 xprt->stat.pending_u);
176e21ee
CL		 2365}
2366
262ca07d
CL		 2367/**
2368 * xs_udp_print_stats - display UDP socket-specifc stats
2369 * @xprt: rpc_xprt struct containing statistics
2370 * @seq: output file
2371 *
2372 */
2373static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2374{
c8475461
CL		 2375 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2376
15a45206
AA		 2377 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2378 "%lu %llu %llu\n",
fbfffbd5 2379 transport->srcport,
262ca07d
CL		 2380 xprt->stat.bind_count,
2381 xprt->stat.sends,
2382 xprt->stat.recvs,
2383 xprt->stat.bad_xids,
2384 xprt->stat.req_u,
15a45206
AA		 2385 xprt->stat.bklog_u,
2386 xprt->stat.max_slots,
2387 xprt->stat.sending_u,
2388 xprt->stat.pending_u);
262ca07d
CL		 2389}
2390
2391/**
2392 * xs_tcp_print_stats - display TCP socket-specifc stats
2393 * @xprt: rpc_xprt struct containing statistics
2394 * @seq: output file
2395 *
2396 */
2397static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2398{
c8475461 2399 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
262ca07d
CL		 2400 long idle_time = 0;
2401
2402 if (xprt_connected(xprt))
2403 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2404
15a45206
AA		 2405 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2406 "%llu %llu %lu %llu %llu\n",
fbfffbd5 2407 transport->srcport,
262ca07d
CL		 2408 xprt->stat.bind_count,
2409 xprt->stat.connect_count,
2410 xprt->stat.connect_time,
2411 idle_time,
2412 xprt->stat.sends,
2413 xprt->stat.recvs,
2414 xprt->stat.bad_xids,
2415 xprt->stat.req_u,
15a45206
AA		 2416 xprt->stat.bklog_u,
2417 xprt->stat.max_slots,
2418 xprt->stat.sending_u,
2419 xprt->stat.pending_u);
262ca07d
CL		 2420}
2421
4cfc7e60
RI		 2422/*
2423 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2424 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2425 * to use the server side send routines.
2426 */
5a51f13a 2427static void *bc_malloc(struct rpc_task *task, size_t size)
4cfc7e60
RI		 2428{
2429 struct page *page;
2430 struct rpc_buffer *buf;
2431
b8a13d03
WAA		 2432 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2433 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2434 return NULL;
4cfc7e60 2435
b8a13d03 2436 page = alloc_page(GFP_KERNEL);
4cfc7e60
RI		 2437 if (!page)
2438 return NULL;
2439
2440 buf = page_address(page);
2441 buf->len = PAGE_SIZE;
2442
2443 return buf->data;
2444}
2445
2446/*
2447 * Free the space allocated in the bc_alloc routine
2448 */
5a51f13a 2449static void bc_free(void *buffer)
4cfc7e60
RI		 2450{
2451 struct rpc_buffer *buf;
2452
2453 if (!buffer)
2454 return;
2455
2456 buf = container_of(buffer, struct rpc_buffer, data);
2457 free_page((unsigned long)buf);
2458}
2459
2460/*
2461 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2462 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2463 */
2464static int bc_sendto(struct rpc_rqst *req)
2465{
2466 int len;
2467 struct xdr_buf *xbufp = &req->rq_snd_buf;
2468 struct rpc_xprt *xprt = req->rq_xprt;
2469 struct sock_xprt *transport =
2470 container_of(xprt, struct sock_xprt, xprt);
2471 struct socket *sock = transport->sock;
2472 unsigned long headoff;
2473 unsigned long tailoff;
2474
61677eee 2475 xs_encode_stream_record_marker(xbufp);
4cfc7e60
RI		 2476
2477 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2478 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2479 len = svc_send_common(sock, xbufp,
2480 virt_to_page(xbufp->head[0].iov_base), headoff,
2481 xbufp->tail[0].iov_base, tailoff);
2482
2483 if (len != xbufp->len) {
2484 printk(KERN_NOTICE "Error sending entire callback!\n");
2485 len = -EAGAIN;
2486 }
2487
2488 return len;
2489}
2490
2491/*
2492 * The send routine. Borrows from svc_send
2493 */
2494static int bc_send_request(struct rpc_task *task)
2495{
2496 struct rpc_rqst *req = task->tk_rqstp;
2497 struct svc_xprt *xprt;
4cfc7e60
RI		 2498 u32 len;
2499
2500 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2501 /*
2502 * Get the server socket associated with this callback xprt
2503 */
2504 xprt = req->rq_xprt->bc_xprt;
4cfc7e60
RI		 2505
2506 /*
2507 * Grab the mutex to serialize data as the connection is shared
2508 * with the fore channel
2509 */
2510 if (!mutex_trylock(&xprt->xpt_mutex)) {
2511 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2512 if (!mutex_trylock(&xprt->xpt_mutex))
2513 return -EAGAIN;
2514 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2515 }
2516 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2517 len = -ENOTCONN;
2518 else
2519 len = bc_sendto(req);
2520 mutex_unlock(&xprt->xpt_mutex);
2521
2522 if (len > 0)
2523 len = 0;
2524
2525 return len;
2526}
2527
2528/*
2529 * The close routine. Since this is client initiated, we do nothing
2530 */
2531
2532static void bc_close(struct rpc_xprt *xprt)
2533{
4cfc7e60
RI		 2534}
2535
2536/*
2537 * The xprt destroy routine. Again, because this connection is client
2538 * initiated, we do nothing
2539 */
2540
2541static void bc_destroy(struct rpc_xprt *xprt)
2542{
4cfc7e60
RI		 2543}
2544
176e21ee
CL		 2545static struct rpc_xprt_ops xs_local_ops = {
2546 .reserve_xprt = xprt_reserve_xprt,
2547 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2548 .alloc_slot = xprt_alloc_slot,
176e21ee
CL		 2549 .rpcbind = xs_local_rpcbind,
2550 .set_port = xs_local_set_port,
dc107402 2551 .connect = xs_local_connect,
176e21ee
CL		 2552 .buf_alloc = rpc_malloc,
2553 .buf_free = rpc_free,
2554 .send_request = xs_local_send_request,
2555 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2556 .close = xs_close,
a1311d87 2557 .destroy = xs_destroy,
176e21ee
CL		 2558 .print_stats = xs_local_print_stats,
2559};
2560
262965f5 2561static struct rpc_xprt_ops xs_udp_ops = {
43118c29 2562 .set_buffer_size = xs_udp_set_buffer_size,
12a80469 2563 .reserve_xprt = xprt_reserve_xprt_cong,
49e9a890 2564 .release_xprt = xprt_release_xprt_cong,
f39c1bfb 2565 .alloc_slot = xprt_alloc_slot,
45160d62 2566 .rpcbind = rpcb_getport_async,
92200412 2567 .set_port = xs_set_port,
262965f5 2568 .connect = xs_connect,
02107148
CL		 2569 .buf_alloc = rpc_malloc,
2570 .buf_free = rpc_free,
262965f5 2571 .send_request = xs_udp_send_request,
fe3aca29 2572 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
46c0ee8b 2573 .timer = xs_udp_timer,
a58dd398 2574 .release_request = xprt_release_rqst_cong,
262965f5
CL		 2575 .close = xs_close,
2576 .destroy = xs_destroy,
262ca07d 2577 .print_stats = xs_udp_print_stats,
262965f5
CL		 2578};
2579
2580static struct rpc_xprt_ops xs_tcp_ops = {
12a80469 2581 .reserve_xprt = xprt_reserve_xprt,
e0ab53de 2582 .release_xprt = xs_tcp_release_xprt,
f39c1bfb 2583 .alloc_slot = xprt_lock_and_alloc_slot,
45160d62 2584 .rpcbind = rpcb_getport_async,
92200412 2585 .set_port = xs_set_port,
0b9e7943 2586 .connect = xs_connect,
02107148
CL		 2587 .buf_alloc = rpc_malloc,
2588 .buf_free = rpc_free,
262965f5 2589 .send_request = xs_tcp_send_request,
fe3aca29 2590 .set_retrans_timeout = xprt_set_retrans_timeout_def,
f75e6745 2591 .close = xs_tcp_close,
9903cd1c 2592 .destroy = xs_destroy,
262ca07d 2593 .print_stats = xs_tcp_print_stats,
a246b010
CL		 2594};
2595
4cfc7e60
RI		 2596/*
2597 * The rpc_xprt_ops for the server backchannel
2598 */
2599
2600static struct rpc_xprt_ops bc_tcp_ops = {
2601 .reserve_xprt = xprt_reserve_xprt,
2602 .release_xprt = xprt_release_xprt,
84e28a30 2603 .alloc_slot = xprt_alloc_slot,
4cfc7e60
RI		 2604 .buf_alloc = bc_malloc,
2605 .buf_free = bc_free,
2606 .send_request = bc_send_request,
2607 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2608 .close = bc_close,
2609 .destroy = bc_destroy,
2610 .print_stats = xs_tcp_print_stats,
2611};
2612
92476850
CL		 2613static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2614{
2615 static const struct sockaddr_in sin = {
2616 .sin_family = AF_INET,
2617 .sin_addr.s_addr = htonl(INADDR_ANY),
2618 };
2619 static const struct sockaddr_in6 sin6 = {
2620 .sin6_family = AF_INET6,
2621 .sin6_addr = IN6ADDR_ANY_INIT,
2622 };
2623
2624 switch (family) {
176e21ee
CL		 2625 case AF_LOCAL:
2626 break;
92476850
CL		 2627 case AF_INET:
2628 memcpy(sap, &sin, sizeof(sin));
2629 break;
2630 case AF_INET6:
2631 memcpy(sap, &sin6, sizeof(sin6));
2632 break;
2633 default:
2634 dprintk("RPC: %s: Bad address family\n", __func__);
2635 return -EAFNOSUPPORT;
2636 }
2637 return 0;
2638}
2639
3c341b0b 2640static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
d9ba131d
TM		 2641 unsigned int slot_table_size,
2642 unsigned int max_slot_table_size)
c8541ecd
CL		 2643{
2644 struct rpc_xprt *xprt;
ffc2e518 2645 struct sock_xprt *new;
c8541ecd 2646
96802a09 2647 if (args->addrlen > sizeof(xprt->addr)) {
46121cf7 2648 dprintk("RPC: xs_setup_xprt: address too large\n");
c8541ecd
CL		 2649 return ERR_PTR(-EBADF);
2650 }
2651
d9ba131d
TM		 2652 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2653 max_slot_table_size);
bd1722d4 2654 if (xprt == NULL) {
46121cf7
CL		 2655 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2656 "rpc_xprt\n");
c8541ecd
CL		 2657 return ERR_PTR(-ENOMEM);
2658 }
c8541ecd 2659
bd1722d4 2660 new = container_of(xprt, struct sock_xprt, xprt);
96802a09
FM		 2661 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2662 xprt->addrlen = args->addrlen;
d3bc9a1d 2663 if (args->srcaddr)
fbfffbd5 2664 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
92476850
CL		 2665 else {
2666 int err;
2667 err = xs_init_anyaddr(args->dstaddr->sa_family,
2668 (struct sockaddr *)&new->srcaddr);
2aa13531
SK		 2669 if (err != 0) {
2670 xprt_free(xprt);
92476850 2671 return ERR_PTR(err);
2aa13531 2672 }
92476850 2673 }
c8541ecd
CL		 2674
2675 return xprt;
2676}
2677
176e21ee
CL		 2678static const struct rpc_timeout xs_local_default_timeout = {
2679 .to_initval = 10 * HZ,
2680 .to_maxval = 10 * HZ,
2681 .to_retries = 2,
2682};
2683
2684/**
2685 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2686 * @args: rpc transport creation arguments
2687 *
2688 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2689 */
2690static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2691{
2692 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2693 struct sock_xprt *transport;
2694 struct rpc_xprt *xprt;
2695 struct rpc_xprt *ret;
2696
d9ba131d
TM		 2697 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2698 xprt_max_tcp_slot_table_entries);
176e21ee
CL		 2699 if (IS_ERR(xprt))
2700 return xprt;
2701 transport = container_of(xprt, struct sock_xprt, xprt);
2702
2703 xprt->prot = 0;
2704 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2705 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2706
2707 xprt->bind_timeout = XS_BIND_TO;
2708 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2709 xprt->idle_timeout = XS_IDLE_DISC_TO;
2710
2711 xprt->ops = &xs_local_ops;
2712 xprt->timeout = &xs_local_default_timeout;
2713
93dc41bd
N		 2714 INIT_DELAYED_WORK(&transport->connect_worker,
2715 xs_dummy_setup_socket);
2716
176e21ee
CL		 2717 switch (sun->sun_family) {
2718 case AF_LOCAL:
2719 if (sun->sun_path[0] != '/') {
2720 dprintk("RPC: bad AF_LOCAL address: %s\n",
2721 sun->sun_path);
2722 ret = ERR_PTR(-EINVAL);
2723 goto out_err;
2724 }
2725 xprt_set_bound(xprt);
176e21ee 2726 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
7073ea87
BF		 2727 ret = ERR_PTR(xs_local_setup_socket(transport));
2728 if (ret)
2729 goto out_err;
176e21ee
CL		 2730 break;
2731 default:
2732 ret = ERR_PTR(-EAFNOSUPPORT);
2733 goto out_err;
2734 }
2735
2736 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2737 xprt->address_strings[RPC_DISPLAY_ADDR]);
2738
2739 if (try_module_get(THIS_MODULE))
2740 return xprt;
2741 ret = ERR_PTR(-EINVAL);
2742out_err:
2743 xprt_free(xprt);
2744 return ret;
2745}
2746
2881ae74
TM		 2747static const struct rpc_timeout xs_udp_default_timeout = {
2748 .to_initval = 5 * HZ,
2749 .to_maxval = 30 * HZ,
2750 .to_increment = 5 * HZ,
2751 .to_retries = 5,
2752};
2753
9903cd1c
CL		 2754/**
2755 * xs_setup_udp - Set up transport to use a UDP socket
96802a09 2756 * @args: rpc transport creation arguments
9903cd1c
CL		 2757 *
2758 */
483066d6 2759static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
a246b010 2760{
8f9d5b1a 2761 struct sockaddr *addr = args->dstaddr;
c8541ecd 2762 struct rpc_xprt *xprt;
c8475461 2763 struct sock_xprt *transport;
0a68b0be 2764 struct rpc_xprt *ret;
a246b010 2765
d9ba131d
TM		 2766 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2767 xprt_udp_slot_table_entries);
c8541ecd
CL		 2768 if (IS_ERR(xprt))
2769 return xprt;
c8475461 2770 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2771
ec739ef0 2772 xprt->prot = IPPROTO_UDP;
808012fb 2773 xprt->tsh_size = 0;
a246b010
CL		 2774 /* XXX: header size can vary due to auth type, IPv6, etc. */
2775 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2776
03bf4b70 2777 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2778 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2779 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2780
262965f5 2781 xprt->ops = &xs_udp_ops;
a246b010 2782
ba7392bb 2783 xprt->timeout = &xs_udp_default_timeout;
a246b010 2784
8f9d5b1a
CL		 2785 switch (addr->sa_family) {
2786 case AF_INET:
2787 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2788 xprt_set_bound(xprt);
2789
2790 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2791 xs_udp_setup_socket);
9dc3b095 2792 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
8f9d5b1a
CL		 2793 break;
2794 case AF_INET6:
2795 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2796 xprt_set_bound(xprt);
2797
2798 INIT_DELAYED_WORK(&transport->connect_worker,
8c14ff2a 2799 xs_udp_setup_socket);
9dc3b095 2800 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
8f9d5b1a
CL		 2801 break;
2802 default:
0a68b0be
BF		 2803 ret = ERR_PTR(-EAFNOSUPPORT);
2804 goto out_err;
8f9d5b1a
CL		 2805 }
2806
c740eff8
CL		 2807 if (xprt_bound(xprt))
2808 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2809 xprt->address_strings[RPC_DISPLAY_ADDR],
2810 xprt->address_strings[RPC_DISPLAY_PORT],
2811 xprt->address_strings[RPC_DISPLAY_PROTO]);
2812 else
2813 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2814 xprt->address_strings[RPC_DISPLAY_ADDR],
2815 xprt->address_strings[RPC_DISPLAY_PROTO]);
edb267a6 2816
bc25571e
TT		 2817 if (try_module_get(THIS_MODULE))
2818 return xprt;
0a68b0be
BF		 2819 ret = ERR_PTR(-EINVAL);
2820out_err:
e204e621 2821 xprt_free(xprt);
0a68b0be 2822 return ret;
a246b010
CL		 2823}
2824
2881ae74
TM		 2825static const struct rpc_timeout xs_tcp_default_timeout = {
2826 .to_initval = 60 * HZ,
2827 .to_maxval = 60 * HZ,
2828 .to_retries = 2,
2829};
2830
9903cd1c
CL		 2831/**
2832 * xs_setup_tcp - Set up transport to use a TCP socket
96802a09 2833 * @args: rpc transport creation arguments
9903cd1c
CL		 2834 *
2835 */
483066d6 2836static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
a246b010 2837{
8f9d5b1a 2838 struct sockaddr *addr = args->dstaddr;
c8541ecd 2839 struct rpc_xprt *xprt;
c8475461 2840 struct sock_xprt *transport;
0a68b0be 2841 struct rpc_xprt *ret;
b7993ceb
TM		 2842 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2843
2844 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2845 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
a246b010 2846
d9ba131d 2847 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
b7993ceb 2848 max_slot_table_size);
c8541ecd
CL		 2849 if (IS_ERR(xprt))
2850 return xprt;
c8475461 2851 transport = container_of(xprt, struct sock_xprt, xprt);
a246b010 2852
ec739ef0 2853 xprt->prot = IPPROTO_TCP;
808012fb 2854 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
808012fb 2855 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
a246b010 2856
03bf4b70 2857 xprt->bind_timeout = XS_BIND_TO;
03bf4b70
CL		 2858 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2859 xprt->idle_timeout = XS_IDLE_DISC_TO;
a246b010 2860
262965f5 2861 xprt->ops = &xs_tcp_ops;
ba7392bb 2862 xprt->timeout = &xs_tcp_default_timeout;
a246b010 2863
8f9d5b1a
CL		 2864 switch (addr->sa_family) {
2865 case AF_INET:
2866 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2867 xprt_set_bound(xprt);
2868
9dc3b095 2869 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2870 xs_tcp_setup_socket);
9dc3b095 2871 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
8f9d5b1a
CL		 2872 break;
2873 case AF_INET6:
2874 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2875 xprt_set_bound(xprt);
2876
9dc3b095 2877 INIT_DELAYED_WORK(&transport->connect_worker,
cdd518d5 2878 xs_tcp_setup_socket);
9dc3b095 2879 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
8f9d5b1a
CL		 2880 break;
2881 default:
0a68b0be
BF		 2882 ret = ERR_PTR(-EAFNOSUPPORT);
2883 goto out_err;
8f9d5b1a
CL		 2884 }
2885
c740eff8
CL		 2886 if (xprt_bound(xprt))
2887 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2888 xprt->address_strings[RPC_DISPLAY_ADDR],
2889 xprt->address_strings[RPC_DISPLAY_PORT],
2890 xprt->address_strings[RPC_DISPLAY_PROTO]);
2891 else
2892 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2893 xprt->address_strings[RPC_DISPLAY_ADDR],
2894 xprt->address_strings[RPC_DISPLAY_PROTO]);
2895
edb267a6 2896
bc25571e
TT		 2897 if (try_module_get(THIS_MODULE))
2898 return xprt;
0a68b0be
BF		 2899 ret = ERR_PTR(-EINVAL);
2900out_err:
e204e621 2901 xprt_free(xprt);
0a68b0be 2902 return ret;
a246b010 2903}
282b32e1 2904
f300baba
AB		 2905/**
2906 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2907 * @args: rpc transport creation arguments
2908 *
2909 */
2910static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2911{
2912 struct sockaddr *addr = args->dstaddr;
2913 struct rpc_xprt *xprt;
2914 struct sock_xprt *transport;
2915 struct svc_sock *bc_sock;
0a68b0be 2916 struct rpc_xprt *ret;
f300baba 2917
f0418aa4
BF		 2918 if (args->bc_xprt->xpt_bc_xprt) {
2919 /*
2920 * This server connection already has a backchannel
e3bfab18
BF		 2921 * transport; we can't create a new one, as we wouldn't
2922 * be able to match replies based on xid any more. So,
f0418aa4
BF		 2923 * reuse the already-existing one:
2924 */
2925 return args->bc_xprt->xpt_bc_xprt;
2926 }
d9ba131d
TM		 2927 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2928 xprt_tcp_slot_table_entries);
f300baba
AB		 2929 if (IS_ERR(xprt))
2930 return xprt;
2931 transport = container_of(xprt, struct sock_xprt, xprt);
2932
2933 xprt->prot = IPPROTO_TCP;
2934 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2935 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2936 xprt->timeout = &xs_tcp_default_timeout;
2937
2938 /* backchannel */
2939 xprt_set_bound(xprt);
2940 xprt->bind_timeout = 0;
f300baba
AB		 2941 xprt->reestablish_timeout = 0;
2942 xprt->idle_timeout = 0;
2943
f300baba
AB		 2944 xprt->ops = &bc_tcp_ops;
2945
2946 switch (addr->sa_family) {
2947 case AF_INET:
2948 xs_format_peer_addresses(xprt, "tcp",
2949 RPCBIND_NETID_TCP);
2950 break;
2951 case AF_INET6:
2952 xs_format_peer_addresses(xprt, "tcp",
2953 RPCBIND_NETID_TCP6);
2954 break;
2955 default:
0a68b0be
BF		 2956 ret = ERR_PTR(-EAFNOSUPPORT);
2957 goto out_err;
f300baba
AB		 2958 }
2959
50fa0d40
PE		 2960 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2961 xprt->address_strings[RPC_DISPLAY_ADDR],
2962 xprt->address_strings[RPC_DISPLAY_PORT],
2963 xprt->address_strings[RPC_DISPLAY_PROTO]);
f300baba 2964
99de8ea9
BF		 2965 /*
2966 * Once we've associated a backchannel xprt with a connection,
28303ca3
WM		 2967 * we want to keep it around as long as the connection lasts,
2968 * in case we need to start using it for a backchannel again;
2969 * this reference won't be dropped until bc_xprt is destroyed.
99de8ea9
BF		 2970 */
2971 xprt_get(xprt);
2972 args->bc_xprt->xpt_bc_xprt = xprt;
2973 xprt->bc_xprt = args->bc_xprt;
2974 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2975 transport->sock = bc_sock->sk_sock;
2976 transport->inet = bc_sock->sk_sk;
2977
f300baba
AB		 2978 /*
2979 * Since we don't want connections for the backchannel, we set
2980 * the xprt status to connected
2981 */
2982 xprt_set_connected(xprt);
2983
2984
2985 if (try_module_get(THIS_MODULE))
2986 return xprt;
99de8ea9 2987 xprt_put(xprt);
0a68b0be
BF		 2988 ret = ERR_PTR(-EINVAL);
2989out_err:
e204e621 2990 xprt_free(xprt);
0a68b0be 2991 return ret;
f300baba
AB		 2992}
2993
176e21ee
CL		 2994static struct xprt_class xs_local_transport = {
2995 .list = LIST_HEAD_INIT(xs_local_transport.list),
2996 .name = "named UNIX socket",
2997 .owner = THIS_MODULE,
2998 .ident = XPRT_TRANSPORT_LOCAL,
2999 .setup = xs_setup_local,
3000};
3001
bc25571e
TT		 3002static struct xprt_class xs_udp_transport = {
3003 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3004 .name = "udp",
3005 .owner = THIS_MODULE,
f300baba 3006 .ident = XPRT_TRANSPORT_UDP,
bc25571e
TT		 3007 .setup = xs_setup_udp,
3008};
3009
3010static struct xprt_class xs_tcp_transport = {
3011 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3012 .name = "tcp",
3013 .owner = THIS_MODULE,
f300baba 3014 .ident = XPRT_TRANSPORT_TCP,
bc25571e
TT		 3015 .setup = xs_setup_tcp,
3016};
3017
f300baba
AB		 3018static struct xprt_class xs_bc_tcp_transport = {
3019 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3020 .name = "tcp NFSv4.1 backchannel",
3021 .owner = THIS_MODULE,
3022 .ident = XPRT_TRANSPORT_BC_TCP,
3023 .setup = xs_setup_bc_tcp,
3024};
3025
282b32e1 3026/**
bc25571e 3027 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
282b32e1
CL		 3028 *
3029 */
3030int init_socket_xprt(void)
3031{
fbf76683 3032#ifdef RPC_DEBUG
2b1bec5f 3033 if (!sunrpc_table_header)
0b4d4147 3034 sunrpc_table_header = register_sysctl_table(sunrpc_table);
fbf76683
CL		 3035#endif
3036
176e21ee 3037 xprt_register_transport(&xs_local_transport);
bc25571e
TT		 3038 xprt_register_transport(&xs_udp_transport);
3039 xprt_register_transport(&xs_tcp_transport);
f300baba 3040 xprt_register_transport(&xs_bc_tcp_transport);
bc25571e 3041
282b32e1
CL		 3042 return 0;
3043}
3044
3045/**
bc25571e 3046 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
282b32e1
CL		 3047 *
3048 */
3049void cleanup_socket_xprt(void)
3050{
fbf76683
CL		 3051#ifdef RPC_DEBUG
3052 if (sunrpc_table_header) {
3053 unregister_sysctl_table(sunrpc_table_header);
3054 sunrpc_table_header = NULL;
3055 }
3056#endif
bc25571e 3057
176e21ee 3058 xprt_unregister_transport(&xs_local_transport);
bc25571e
TT		 3059 xprt_unregister_transport(&xs_udp_transport);
3060 xprt_unregister_transport(&xs_tcp_transport);
f300baba 3061 xprt_unregister_transport(&xs_bc_tcp_transport);
282b32e1 3062}
cbf11071 3063
9bbb9e5a
RR		 3064static int param_set_uint_minmax(const char *val,
3065 const struct kernel_param *kp,
cbf11071
TM		 3066 unsigned int min, unsigned int max)
3067{
3068 unsigned long num;
3069 int ret;
3070
3071 if (!val)
3072 return -EINVAL;
3073 ret = strict_strtoul(val, 0, &num);
3074 if (ret == -EINVAL || num < min || num > max)
3075 return -EINVAL;
3076 *((unsigned int *)kp->arg) = num;
3077 return 0;
3078}
3079
9bbb9e5a 3080static int param_set_portnr(const char *val, const struct kernel_param *kp)
cbf11071
TM		 3081{
3082 return param_set_uint_minmax(val, kp,
3083 RPC_MIN_RESVPORT,
3084 RPC_MAX_RESVPORT);
3085}
3086
9bbb9e5a
RR		 3087static struct kernel_param_ops param_ops_portnr = {
3088 .set = param_set_portnr,
3089 .get = param_get_uint,
3090};
3091
cbf11071
TM		 3092#define param_check_portnr(name, p) \
3093 __param_check(name, p, unsigned int);
3094
3095module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3096module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3097
9bbb9e5a
RR		 3098static int param_set_slot_table_size(const char *val,
3099 const struct kernel_param *kp)
cbf11071
TM		 3100{
3101 return param_set_uint_minmax(val, kp,
3102 RPC_MIN_SLOT_TABLE,
3103 RPC_MAX_SLOT_TABLE);
3104}
3105
9bbb9e5a
RR		 3106static struct kernel_param_ops param_ops_slot_table_size = {
3107 .set = param_set_slot_table_size,
3108 .get = param_get_uint,
3109};
3110
cbf11071
TM		 3111#define param_check_slot_table_size(name, p) \
3112 __param_check(name, p, unsigned int);
3113
d9ba131d
TM		 3114static int param_set_max_slot_table_size(const char *val,
3115 const struct kernel_param *kp)
3116{
3117 return param_set_uint_minmax(val, kp,
3118 RPC_MIN_SLOT_TABLE,
3119 RPC_MAX_SLOT_TABLE_LIMIT);
3120}
3121
3122static struct kernel_param_ops param_ops_max_slot_table_size = {
3123 .set = param_set_max_slot_table_size,
3124 .get = param_get_uint,
3125};
3126
3127#define param_check_max_slot_table_size(name, p) \
3128 __param_check(name, p, unsigned int);
3129
cbf11071
TM		 3130module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3131 slot_table_size, 0644);
d9ba131d
TM		 3132module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3133 max_slot_table_size, 0644);
cbf11071
TM		 3134module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3135 slot_table_size, 0644);
3136