SUNRPC: Handle ECONNREFUSED correctly in xprt_transmit()
[linux-2.6.git] / net / sunrpc / xprtsock.c
1 /*
2  * linux/net/sunrpc/xprtsock.c
3  *
4  * Client-side transport implementation for sockets.
5  *
6  * TCP callback races fixes (C) 1998 Red Hat
7  * TCP send fixes (C) 1998 Red Hat
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>
14  *
15  * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16  *
17  * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18  *   <gilles.quillard@bull.net>
19  */
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
37
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/udp.h>
41 #include <net/tcp.h>
42
43 /*
44  * xprtsock tunables
45  */
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
48
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
51
52 /*
53  * We can register our own files under /proc/sys/sunrpc by
54  * calling register_sysctl_table() again.  The files in that
55  * directory become the union of all files registered there.
56  *
57  * We simply need to make sure that we don't collide with
58  * someone else's file names!
59  */
60
61 #ifdef RPC_DEBUG
62
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
67
68 static struct ctl_table_header *sunrpc_table_header;
69
70 /*
71  * FIXME: changing the UDP slot table size should also resize the UDP
72  *        socket buffers for existing UDP transports
73  */
74 static ctl_table xs_tunables_table[] = {
75         {
76                 .ctl_name       = CTL_SLOTTABLE_UDP,
77                 .procname       = "udp_slot_table_entries",
78                 .data           = &xprt_udp_slot_table_entries,
79                 .maxlen         = sizeof(unsigned int),
80                 .mode           = 0644,
81                 .proc_handler   = &proc_dointvec_minmax,
82                 .strategy       = &sysctl_intvec,
83                 .extra1         = &min_slot_table_size,
84                 .extra2         = &max_slot_table_size
85         },
86         {
87                 .ctl_name       = CTL_SLOTTABLE_TCP,
88                 .procname       = "tcp_slot_table_entries",
89                 .data           = &xprt_tcp_slot_table_entries,
90                 .maxlen         = sizeof(unsigned int),
91                 .mode           = 0644,
92                 .proc_handler   = &proc_dointvec_minmax,
93                 .strategy       = &sysctl_intvec,
94                 .extra1         = &min_slot_table_size,
95                 .extra2         = &max_slot_table_size
96         },
97         {
98                 .ctl_name       = CTL_MIN_RESVPORT,
99                 .procname       = "min_resvport",
100                 .data           = &xprt_min_resvport,
101                 .maxlen         = sizeof(unsigned int),
102                 .mode           = 0644,
103                 .proc_handler   = &proc_dointvec_minmax,
104                 .strategy       = &sysctl_intvec,
105                 .extra1         = &xprt_min_resvport_limit,
106                 .extra2         = &xprt_max_resvport_limit
107         },
108         {
109                 .ctl_name       = CTL_MAX_RESVPORT,
110                 .procname       = "max_resvport",
111                 .data           = &xprt_max_resvport,
112                 .maxlen         = sizeof(unsigned int),
113                 .mode           = 0644,
114                 .proc_handler   = &proc_dointvec_minmax,
115                 .strategy       = &sysctl_intvec,
116                 .extra1         = &xprt_min_resvport_limit,
117                 .extra2         = &xprt_max_resvport_limit
118         },
119         {
120                 .ctl_name = 0,
121         },
122 };
123
124 static ctl_table sunrpc_table[] = {
125         {
126                 .ctl_name       = CTL_SUNRPC,
127                 .procname       = "sunrpc",
128                 .mode           = 0555,
129                 .child          = xs_tunables_table
130         },
131         {
132                 .ctl_name = 0,
133         },
134 };
135
136 #endif
137
138 /*
139  * Time out for an RPC UDP socket connect.  UDP socket connects are
140  * synchronous, but we set a timeout anyway in case of resource
141  * exhaustion on the local host.
142  */
143 #define XS_UDP_CONN_TO          (5U * HZ)
144
145 /*
146  * Wait duration for an RPC TCP connection to be established.  Solaris
147  * NFS over TCP uses 60 seconds, for example, which is in line with how
148  * long a server takes to reboot.
149  */
150 #define XS_TCP_CONN_TO          (60U * HZ)
151
152 /*
153  * Wait duration for a reply from the RPC portmapper.
154  */
155 #define XS_BIND_TO              (60U * HZ)
156
157 /*
158  * Delay if a UDP socket connect error occurs.  This is most likely some
159  * kind of resource problem on the local host.
160  */
161 #define XS_UDP_REEST_TO         (2U * HZ)
162
163 /*
164  * The reestablish timeout allows clients to delay for a bit before attempting
165  * to reconnect to a server that just dropped our connection.
166  *
167  * We implement an exponential backoff when trying to reestablish a TCP
168  * transport connection with the server.  Some servers like to drop a TCP
169  * connection when they are overworked, so we start with a short timeout and
170  * increase over time if the server is down or not responding.
171  */
172 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
173 #define XS_TCP_MAX_REEST_TO     (5U * 60 * HZ)
174
175 /*
176  * TCP idle timeout; client drops the transport socket if it is idle
177  * for this long.  Note that we also timeout UDP sockets to prevent
178  * holding port numbers when there is no RPC traffic.
179  */
180 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
181
182 #ifdef RPC_DEBUG
183 # undef  RPC_DEBUG_DATA
184 # define RPCDBG_FACILITY        RPCDBG_TRANS
185 #endif
186
187 #ifdef RPC_DEBUG_DATA
188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
189 {
190         u8 *buf = (u8 *) packet;
191         int j;
192
193         dprintk("RPC:       %s\n", msg);
194         for (j = 0; j < count && j < 128; j += 4) {
195                 if (!(j & 31)) {
196                         if (j)
197                                 dprintk("\n");
198                         dprintk("0x%04x ", j);
199                 }
200                 dprintk("%02x%02x%02x%02x ",
201                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
202         }
203         dprintk("\n");
204 }
205 #else
206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
207 {
208         /* NOP */
209 }
210 #endif
211
212 struct sock_xprt {
213         struct rpc_xprt         xprt;
214
215         /*
216          * Network layer
217          */
218         struct socket *         sock;
219         struct sock *           inet;
220
221         /*
222          * State of TCP reply receive
223          */
224         __be32                  tcp_fraghdr,
225                                 tcp_xid;
226
227         u32                     tcp_offset,
228                                 tcp_reclen;
229
230         unsigned long           tcp_copied,
231                                 tcp_flags;
232
233         /*
234          * Connection of transports
235          */
236         struct delayed_work     connect_worker;
237         struct sockaddr_storage addr;
238         unsigned short          port;
239
240         /*
241          * UDP socket buffer size parameters
242          */
243         size_t                  rcvsize,
244                                 sndsize;
245
246         /*
247          * Saved socket callback addresses
248          */
249         void                    (*old_data_ready)(struct sock *, int);
250         void                    (*old_state_change)(struct sock *);
251         void                    (*old_write_space)(struct sock *);
252         void                    (*old_error_report)(struct sock *);
253 };
254
255 /*
256  * TCP receive state flags
257  */
258 #define TCP_RCV_LAST_FRAG       (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR    (1UL << 1)
260 #define TCP_RCV_COPY_XID        (1UL << 2)
261 #define TCP_RCV_COPY_DATA       (1UL << 3)
262
263 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
264 {
265         return (struct sockaddr *) &xprt->addr;
266 }
267
268 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
269 {
270         return (struct sockaddr_in *) &xprt->addr;
271 }
272
273 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
274 {
275         return (struct sockaddr_in6 *) &xprt->addr;
276 }
277
278 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
279                                           const char *protocol,
280                                           const char *netid)
281 {
282         struct sockaddr_in *addr = xs_addr_in(xprt);
283         char *buf;
284
285         buf = kzalloc(20, GFP_KERNEL);
286         if (buf) {
287                 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
288         }
289         xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
290
291         buf = kzalloc(8, GFP_KERNEL);
292         if (buf) {
293                 snprintf(buf, 8, "%u",
294                                 ntohs(addr->sin_port));
295         }
296         xprt->address_strings[RPC_DISPLAY_PORT] = buf;
297
298         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299
300         buf = kzalloc(48, GFP_KERNEL);
301         if (buf) {
302                 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s",
303                         &addr->sin_addr.s_addr,
304                         ntohs(addr->sin_port),
305                         protocol);
306         }
307         xprt->address_strings[RPC_DISPLAY_ALL] = buf;
308
309         buf = kzalloc(10, GFP_KERNEL);
310         if (buf) {
311                 snprintf(buf, 10, "%02x%02x%02x%02x",
312                                 NIPQUAD(addr->sin_addr.s_addr));
313         }
314         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
315
316         buf = kzalloc(8, GFP_KERNEL);
317         if (buf) {
318                 snprintf(buf, 8, "%4hx",
319                                 ntohs(addr->sin_port));
320         }
321         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
322
323         buf = kzalloc(30, GFP_KERNEL);
324         if (buf) {
325                 snprintf(buf, 30, "%pI4.%u.%u",
326                                 &addr->sin_addr.s_addr,
327                                 ntohs(addr->sin_port) >> 8,
328                                 ntohs(addr->sin_port) & 0xff);
329         }
330         xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
331
332         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
333 }
334
335 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
336                                           const char *protocol,
337                                           const char *netid)
338 {
339         struct sockaddr_in6 *addr = xs_addr_in6(xprt);
340         char *buf;
341
342         buf = kzalloc(40, GFP_KERNEL);
343         if (buf) {
344                 snprintf(buf, 40, "%pI6",&addr->sin6_addr);
345         }
346         xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
347
348         buf = kzalloc(8, GFP_KERNEL);
349         if (buf) {
350                 snprintf(buf, 8, "%u",
351                                 ntohs(addr->sin6_port));
352         }
353         xprt->address_strings[RPC_DISPLAY_PORT] = buf;
354
355         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
356
357         buf = kzalloc(64, GFP_KERNEL);
358         if (buf) {
359                 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s",
360                                 &addr->sin6_addr,
361                                 ntohs(addr->sin6_port),
362                                 protocol);
363         }
364         xprt->address_strings[RPC_DISPLAY_ALL] = buf;
365
366         buf = kzalloc(36, GFP_KERNEL);
367         if (buf)
368                 snprintf(buf, 36, "%pi6", &addr->sin6_addr);
369
370         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
371
372         buf = kzalloc(8, GFP_KERNEL);
373         if (buf) {
374                 snprintf(buf, 8, "%4hx",
375                                 ntohs(addr->sin6_port));
376         }
377         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
378
379         buf = kzalloc(50, GFP_KERNEL);
380         if (buf) {
381                 snprintf(buf, 50, "%pI6.%u.%u",
382                          &addr->sin6_addr,
383                          ntohs(addr->sin6_port) >> 8,
384                          ntohs(addr->sin6_port) & 0xff);
385         }
386         xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
387
388         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
389 }
390
391 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
392 {
393         unsigned int i;
394
395         for (i = 0; i < RPC_DISPLAY_MAX; i++)
396                 switch (i) {
397                 case RPC_DISPLAY_PROTO:
398                 case RPC_DISPLAY_NETID:
399                         continue;
400                 default:
401                         kfree(xprt->address_strings[i]);
402                 }
403 }
404
405 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
406
407 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
408 {
409         struct msghdr msg = {
410                 .msg_name       = addr,
411                 .msg_namelen    = addrlen,
412                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
413         };
414         struct kvec iov = {
415                 .iov_base       = vec->iov_base + base,
416                 .iov_len        = vec->iov_len - base,
417         };
418
419         if (iov.iov_len != 0)
420                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
421         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
422 }
423
424 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
425 {
426         struct page **ppage;
427         unsigned int remainder;
428         int err, sent = 0;
429
430         remainder = xdr->page_len - base;
431         base += xdr->page_base;
432         ppage = xdr->pages + (base >> PAGE_SHIFT);
433         base &= ~PAGE_MASK;
434         for(;;) {
435                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
436                 int flags = XS_SENDMSG_FLAGS;
437
438                 remainder -= len;
439                 if (remainder != 0 || more)
440                         flags |= MSG_MORE;
441                 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
442                 if (remainder == 0 || err != len)
443                         break;
444                 sent += err;
445                 ppage++;
446                 base = 0;
447         }
448         if (sent == 0)
449                 return err;
450         if (err > 0)
451                 sent += err;
452         return sent;
453 }
454
455 /**
456  * xs_sendpages - write pages directly to a socket
457  * @sock: socket to send on
458  * @addr: UDP only -- address of destination
459  * @addrlen: UDP only -- length of destination address
460  * @xdr: buffer containing this request
461  * @base: starting position in the buffer
462  *
463  */
464 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
465 {
466         unsigned int remainder = xdr->len - base;
467         int err, sent = 0;
468
469         if (unlikely(!sock))
470                 return -ENOTSOCK;
471
472         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
473         if (base != 0) {
474                 addr = NULL;
475                 addrlen = 0;
476         }
477
478         if (base < xdr->head[0].iov_len || addr != NULL) {
479                 unsigned int len = xdr->head[0].iov_len - base;
480                 remainder -= len;
481                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
482                 if (remainder == 0 || err != len)
483                         goto out;
484                 sent += err;
485                 base = 0;
486         } else
487                 base -= xdr->head[0].iov_len;
488
489         if (base < xdr->page_len) {
490                 unsigned int len = xdr->page_len - base;
491                 remainder -= len;
492                 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
493                 if (remainder == 0 || err != len)
494                         goto out;
495                 sent += err;
496                 base = 0;
497         } else
498                 base -= xdr->page_len;
499
500         if (base >= xdr->tail[0].iov_len)
501                 return sent;
502         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
503 out:
504         if (sent == 0)
505                 return err;
506         if (err > 0)
507                 sent += err;
508         return sent;
509 }
510
511 static void xs_nospace_callback(struct rpc_task *task)
512 {
513         struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
514
515         transport->inet->sk_write_pending--;
516         clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
517 }
518
519 /**
520  * xs_nospace - place task on wait queue if transmit was incomplete
521  * @task: task to put to sleep
522  *
523  */
524 static void xs_nospace(struct rpc_task *task)
525 {
526         struct rpc_rqst *req = task->tk_rqstp;
527         struct rpc_xprt *xprt = req->rq_xprt;
528         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
529
530         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
531                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
532                         req->rq_slen);
533
534         /* Protect against races with write_space */
535         spin_lock_bh(&xprt->transport_lock);
536
537         /* Don't race with disconnect */
538         if (xprt_connected(xprt)) {
539                 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
540                         /*
541                          * Notify TCP that we're limited by the application
542                          * window size
543                          */
544                         set_bit(SOCK_NOSPACE, &transport->sock->flags);
545                         transport->inet->sk_write_pending++;
546                         /* ...and wait for more buffer space */
547                         xprt_wait_for_buffer_space(task, xs_nospace_callback);
548                 }
549         } else {
550                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
551                 task->tk_status = -ENOTCONN;
552         }
553
554         spin_unlock_bh(&xprt->transport_lock);
555 }
556
557 /**
558  * xs_udp_send_request - write an RPC request to a UDP socket
559  * @task: address of RPC task that manages the state of an RPC request
560  *
561  * Return values:
562  *        0:    The request has been sent
563  *   EAGAIN:    The socket was blocked, please call again later to
564  *              complete the request
565  * ENOTCONN:    Caller needs to invoke connect logic then call again
566  *    other:    Some other error occured, the request was not sent
567  */
568 static int xs_udp_send_request(struct rpc_task *task)
569 {
570         struct rpc_rqst *req = task->tk_rqstp;
571         struct rpc_xprt *xprt = req->rq_xprt;
572         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
573         struct xdr_buf *xdr = &req->rq_snd_buf;
574         int status;
575
576         xs_pktdump("packet data:",
577                                 req->rq_svec->iov_base,
578                                 req->rq_svec->iov_len);
579
580         if (!xprt_bound(xprt))
581                 return -ENOTCONN;
582         status = xs_sendpages(transport->sock,
583                               xs_addr(xprt),
584                               xprt->addrlen, xdr,
585                               req->rq_bytes_sent);
586
587         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
588                         xdr->len - req->rq_bytes_sent, status);
589
590         if (status >= 0) {
591                 task->tk_bytes_sent += status;
592                 if (status >= req->rq_slen)
593                         return 0;
594                 /* Still some bytes left; set up for a retry later. */
595                 status = -EAGAIN;
596         }
597         if (!transport->sock)
598                 goto out;
599
600         switch (status) {
601         case -ENOTSOCK:
602                 status = -ENOTCONN;
603                 /* Should we call xs_close() here? */
604                 break;
605         case -EAGAIN:
606                 xs_nospace(task);
607                 break;
608         default:
609                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
610                         -status);
611         case -ENETUNREACH:
612         case -EPIPE:
613         case -ECONNREFUSED:
614                 /* When the server has died, an ICMP port unreachable message
615                  * prompts ECONNREFUSED. */
616                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
617         }
618 out:
619         return status;
620 }
621
622 /**
623  * xs_tcp_shutdown - gracefully shut down a TCP socket
624  * @xprt: transport
625  *
626  * Initiates a graceful shutdown of the TCP socket by calling the
627  * equivalent of shutdown(SHUT_WR);
628  */
629 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
630 {
631         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
632         struct socket *sock = transport->sock;
633
634         if (sock != NULL)
635                 kernel_sock_shutdown(sock, SHUT_WR);
636 }
637
638 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
639 {
640         u32 reclen = buf->len - sizeof(rpc_fraghdr);
641         rpc_fraghdr *base = buf->head[0].iov_base;
642         *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
643 }
644
645 /**
646  * xs_tcp_send_request - write an RPC request to a TCP socket
647  * @task: address of RPC task that manages the state of an RPC request
648  *
649  * Return values:
650  *        0:    The request has been sent
651  *   EAGAIN:    The socket was blocked, please call again later to
652  *              complete the request
653  * ENOTCONN:    Caller needs to invoke connect logic then call again
654  *    other:    Some other error occured, the request was not sent
655  *
656  * XXX: In the case of soft timeouts, should we eventually give up
657  *      if sendmsg is not able to make progress?
658  */
659 static int xs_tcp_send_request(struct rpc_task *task)
660 {
661         struct rpc_rqst *req = task->tk_rqstp;
662         struct rpc_xprt *xprt = req->rq_xprt;
663         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
664         struct xdr_buf *xdr = &req->rq_snd_buf;
665         int status;
666
667         xs_encode_tcp_record_marker(&req->rq_snd_buf);
668
669         xs_pktdump("packet data:",
670                                 req->rq_svec->iov_base,
671                                 req->rq_svec->iov_len);
672
673         /* Continue transmitting the packet/record. We must be careful
674          * to cope with writespace callbacks arriving _after_ we have
675          * called sendmsg(). */
676         while (1) {
677                 status = xs_sendpages(transport->sock,
678                                         NULL, 0, xdr, req->rq_bytes_sent);
679
680                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
681                                 xdr->len - req->rq_bytes_sent, status);
682
683                 if (unlikely(status < 0))
684                         break;
685
686                 /* If we've sent the entire packet, immediately
687                  * reset the count of bytes sent. */
688                 req->rq_bytes_sent += status;
689                 task->tk_bytes_sent += status;
690                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
691                         req->rq_bytes_sent = 0;
692                         return 0;
693                 }
694
695                 if (status != 0)
696                         continue;
697                 status = -EAGAIN;
698                 break;
699         }
700         if (!transport->sock)
701                 goto out;
702
703         switch (status) {
704         case -ENOTSOCK:
705                 status = -ENOTCONN;
706                 /* Should we call xs_close() here? */
707                 break;
708         case -EAGAIN:
709                 xs_nospace(task);
710                 break;
711         default:
712                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
713                         -status);
714         case -ECONNRESET:
715                 xs_tcp_shutdown(xprt);
716         case -ECONNREFUSED:
717         case -ENOTCONN:
718         case -EPIPE:
719                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
720         }
721 out:
722         return status;
723 }
724
725 /**
726  * xs_tcp_release_xprt - clean up after a tcp transmission
727  * @xprt: transport
728  * @task: rpc task
729  *
730  * This cleans up if an error causes us to abort the transmission of a request.
731  * In this case, the socket may need to be reset in order to avoid confusing
732  * the server.
733  */
734 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
735 {
736         struct rpc_rqst *req;
737
738         if (task != xprt->snd_task)
739                 return;
740         if (task == NULL)
741                 goto out_release;
742         req = task->tk_rqstp;
743         if (req->rq_bytes_sent == 0)
744                 goto out_release;
745         if (req->rq_bytes_sent == req->rq_snd_buf.len)
746                 goto out_release;
747         set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
748 out_release:
749         xprt_release_xprt(xprt, task);
750 }
751
752 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
753 {
754         transport->old_data_ready = sk->sk_data_ready;
755         transport->old_state_change = sk->sk_state_change;
756         transport->old_write_space = sk->sk_write_space;
757         transport->old_error_report = sk->sk_error_report;
758 }
759
760 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
761 {
762         sk->sk_data_ready = transport->old_data_ready;
763         sk->sk_state_change = transport->old_state_change;
764         sk->sk_write_space = transport->old_write_space;
765         sk->sk_error_report = transport->old_error_report;
766 }
767
768 static void xs_reset_transport(struct sock_xprt *transport)
769 {
770         struct socket *sock = transport->sock;
771         struct sock *sk = transport->inet;
772
773         if (sk == NULL)
774                 return;
775
776         write_lock_bh(&sk->sk_callback_lock);
777         transport->inet = NULL;
778         transport->sock = NULL;
779
780         sk->sk_user_data = NULL;
781
782         xs_restore_old_callbacks(transport, sk);
783         write_unlock_bh(&sk->sk_callback_lock);
784
785         sk->sk_no_check = 0;
786
787         sock_release(sock);
788 }
789
790 /**
791  * xs_close - close a socket
792  * @xprt: transport
793  *
794  * This is used when all requests are complete; ie, no DRC state remains
795  * on the server we want to save.
796  */
797 static void xs_close(struct rpc_xprt *xprt)
798 {
799         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
800
801         dprintk("RPC:       xs_close xprt %p\n", xprt);
802
803         xs_reset_transport(transport);
804
805         smp_mb__before_clear_bit();
806         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
807         clear_bit(XPRT_CLOSING, &xprt->state);
808         smp_mb__after_clear_bit();
809         xprt_disconnect_done(xprt);
810 }
811
812 /**
813  * xs_destroy - prepare to shutdown a transport
814  * @xprt: doomed transport
815  *
816  */
817 static void xs_destroy(struct rpc_xprt *xprt)
818 {
819         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
820
821         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
822
823         cancel_rearming_delayed_work(&transport->connect_worker);
824
825         xs_close(xprt);
826         xs_free_peer_addresses(xprt);
827         kfree(xprt->slot);
828         kfree(xprt);
829         module_put(THIS_MODULE);
830 }
831
832 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
833 {
834         return (struct rpc_xprt *) sk->sk_user_data;
835 }
836
837 /**
838  * xs_udp_data_ready - "data ready" callback for UDP sockets
839  * @sk: socket with data to read
840  * @len: how much data to read
841  *
842  */
843 static void xs_udp_data_ready(struct sock *sk, int len)
844 {
845         struct rpc_task *task;
846         struct rpc_xprt *xprt;
847         struct rpc_rqst *rovr;
848         struct sk_buff *skb;
849         int err, repsize, copied;
850         u32 _xid;
851         __be32 *xp;
852
853         read_lock(&sk->sk_callback_lock);
854         dprintk("RPC:       xs_udp_data_ready...\n");
855         if (!(xprt = xprt_from_sock(sk)))
856                 goto out;
857
858         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
859                 goto out;
860
861         if (xprt->shutdown)
862                 goto dropit;
863
864         repsize = skb->len - sizeof(struct udphdr);
865         if (repsize < 4) {
866                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
867                 goto dropit;
868         }
869
870         /* Copy the XID from the skb... */
871         xp = skb_header_pointer(skb, sizeof(struct udphdr),
872                                 sizeof(_xid), &_xid);
873         if (xp == NULL)
874                 goto dropit;
875
876         /* Look up and lock the request corresponding to the given XID */
877         spin_lock(&xprt->transport_lock);
878         rovr = xprt_lookup_rqst(xprt, *xp);
879         if (!rovr)
880                 goto out_unlock;
881         task = rovr->rq_task;
882
883         if ((copied = rovr->rq_private_buf.buflen) > repsize)
884                 copied = repsize;
885
886         /* Suck it into the iovec, verify checksum if not done by hw. */
887         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
888                 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
889                 goto out_unlock;
890         }
891
892         UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
893
894         /* Something worked... */
895         dst_confirm(skb->dst);
896
897         xprt_adjust_cwnd(task, copied);
898         xprt_update_rtt(task);
899         xprt_complete_rqst(task, copied);
900
901  out_unlock:
902         spin_unlock(&xprt->transport_lock);
903  dropit:
904         skb_free_datagram(sk, skb);
905  out:
906         read_unlock(&sk->sk_callback_lock);
907 }
908
909 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
910 {
911         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
912         size_t len, used;
913         char *p;
914
915         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
916         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
917         used = xdr_skb_read_bits(desc, p, len);
918         transport->tcp_offset += used;
919         if (used != len)
920                 return;
921
922         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
923         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
924                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
925         else
926                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
927         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
928
929         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
930         transport->tcp_offset = 0;
931
932         /* Sanity check of the record length */
933         if (unlikely(transport->tcp_reclen < 4)) {
934                 dprintk("RPC:       invalid TCP record fragment length\n");
935                 xprt_force_disconnect(xprt);
936                 return;
937         }
938         dprintk("RPC:       reading TCP record fragment of length %d\n",
939                         transport->tcp_reclen);
940 }
941
942 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
943 {
944         if (transport->tcp_offset == transport->tcp_reclen) {
945                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
946                 transport->tcp_offset = 0;
947                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
948                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
949                         transport->tcp_flags |= TCP_RCV_COPY_XID;
950                         transport->tcp_copied = 0;
951                 }
952         }
953 }
954
955 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
956 {
957         size_t len, used;
958         char *p;
959
960         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
961         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
962         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
963         used = xdr_skb_read_bits(desc, p, len);
964         transport->tcp_offset += used;
965         if (used != len)
966                 return;
967         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
968         transport->tcp_flags |= TCP_RCV_COPY_DATA;
969         transport->tcp_copied = 4;
970         dprintk("RPC:       reading reply for XID %08x\n",
971                         ntohl(transport->tcp_xid));
972         xs_tcp_check_fraghdr(transport);
973 }
974
975 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
976 {
977         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
978         struct rpc_rqst *req;
979         struct xdr_buf *rcvbuf;
980         size_t len;
981         ssize_t r;
982
983         /* Find and lock the request corresponding to this xid */
984         spin_lock(&xprt->transport_lock);
985         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
986         if (!req) {
987                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
988                 dprintk("RPC:       XID %08x request not found!\n",
989                                 ntohl(transport->tcp_xid));
990                 spin_unlock(&xprt->transport_lock);
991                 return;
992         }
993
994         rcvbuf = &req->rq_private_buf;
995         len = desc->count;
996         if (len > transport->tcp_reclen - transport->tcp_offset) {
997                 struct xdr_skb_reader my_desc;
998
999                 len = transport->tcp_reclen - transport->tcp_offset;
1000                 memcpy(&my_desc, desc, sizeof(my_desc));
1001                 my_desc.count = len;
1002                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1003                                           &my_desc, xdr_skb_read_bits);
1004                 desc->count -= r;
1005                 desc->offset += r;
1006         } else
1007                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1008                                           desc, xdr_skb_read_bits);
1009
1010         if (r > 0) {
1011                 transport->tcp_copied += r;
1012                 transport->tcp_offset += r;
1013         }
1014         if (r != len) {
1015                 /* Error when copying to the receive buffer,
1016                  * usually because we weren't able to allocate
1017                  * additional buffer pages. All we can do now
1018                  * is turn off TCP_RCV_COPY_DATA, so the request
1019                  * will not receive any additional updates,
1020                  * and time out.
1021                  * Any remaining data from this record will
1022                  * be discarded.
1023                  */
1024                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1025                 dprintk("RPC:       XID %08x truncated request\n",
1026                                 ntohl(transport->tcp_xid));
1027                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1028                                 "tcp_offset = %u, tcp_reclen = %u\n",
1029                                 xprt, transport->tcp_copied,
1030                                 transport->tcp_offset, transport->tcp_reclen);
1031                 goto out;
1032         }
1033
1034         dprintk("RPC:       XID %08x read %Zd bytes\n",
1035                         ntohl(transport->tcp_xid), r);
1036         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1037                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1038                         transport->tcp_offset, transport->tcp_reclen);
1039
1040         if (transport->tcp_copied == req->rq_private_buf.buflen)
1041                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1042         else if (transport->tcp_offset == transport->tcp_reclen) {
1043                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1044                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1045         }
1046
1047 out:
1048         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1049                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1050         spin_unlock(&xprt->transport_lock);
1051         xs_tcp_check_fraghdr(transport);
1052 }
1053
1054 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1055 {
1056         size_t len;
1057
1058         len = transport->tcp_reclen - transport->tcp_offset;
1059         if (len > desc->count)
1060                 len = desc->count;
1061         desc->count -= len;
1062         desc->offset += len;
1063         transport->tcp_offset += len;
1064         dprintk("RPC:       discarded %Zu bytes\n", len);
1065         xs_tcp_check_fraghdr(transport);
1066 }
1067
1068 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1069 {
1070         struct rpc_xprt *xprt = rd_desc->arg.data;
1071         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1072         struct xdr_skb_reader desc = {
1073                 .skb    = skb,
1074                 .offset = offset,
1075                 .count  = len,
1076         };
1077
1078         dprintk("RPC:       xs_tcp_data_recv started\n");
1079         do {
1080                 /* Read in a new fragment marker if necessary */
1081                 /* Can we ever really expect to get completely empty fragments? */
1082                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1083                         xs_tcp_read_fraghdr(xprt, &desc);
1084                         continue;
1085                 }
1086                 /* Read in the xid if necessary */
1087                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1088                         xs_tcp_read_xid(transport, &desc);
1089                         continue;
1090                 }
1091                 /* Read in the request data */
1092                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1093                         xs_tcp_read_request(xprt, &desc);
1094                         continue;
1095                 }
1096                 /* Skip over any trailing bytes on short reads */
1097                 xs_tcp_read_discard(transport, &desc);
1098         } while (desc.count);
1099         dprintk("RPC:       xs_tcp_data_recv done\n");
1100         return len - desc.count;
1101 }
1102
1103 /**
1104  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1105  * @sk: socket with data to read
1106  * @bytes: how much data to read
1107  *
1108  */
1109 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1110 {
1111         struct rpc_xprt *xprt;
1112         read_descriptor_t rd_desc;
1113         int read;
1114
1115         dprintk("RPC:       xs_tcp_data_ready...\n");
1116
1117         read_lock(&sk->sk_callback_lock);
1118         if (!(xprt = xprt_from_sock(sk)))
1119                 goto out;
1120         if (xprt->shutdown)
1121                 goto out;
1122
1123         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1124         rd_desc.arg.data = xprt;
1125         do {
1126                 rd_desc.count = 65536;
1127                 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1128         } while (read > 0);
1129 out:
1130         read_unlock(&sk->sk_callback_lock);
1131 }
1132
1133 /**
1134  * xs_tcp_state_change - callback to handle TCP socket state changes
1135  * @sk: socket whose state has changed
1136  *
1137  */
1138 static void xs_tcp_state_change(struct sock *sk)
1139 {
1140         struct rpc_xprt *xprt;
1141
1142         read_lock(&sk->sk_callback_lock);
1143         if (!(xprt = xprt_from_sock(sk)))
1144                 goto out;
1145         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1146         dprintk("RPC:       state %x conn %d dead %d zapped %d\n",
1147                         sk->sk_state, xprt_connected(xprt),
1148                         sock_flag(sk, SOCK_DEAD),
1149                         sock_flag(sk, SOCK_ZAPPED));
1150
1151         switch (sk->sk_state) {
1152         case TCP_ESTABLISHED:
1153                 spin_lock_bh(&xprt->transport_lock);
1154                 if (!xprt_test_and_set_connected(xprt)) {
1155                         struct sock_xprt *transport = container_of(xprt,
1156                                         struct sock_xprt, xprt);
1157
1158                         /* Reset TCP record info */
1159                         transport->tcp_offset = 0;
1160                         transport->tcp_reclen = 0;
1161                         transport->tcp_copied = 0;
1162                         transport->tcp_flags =
1163                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1164
1165                         xprt_wake_pending_tasks(xprt, 0);
1166                 }
1167                 spin_unlock_bh(&xprt->transport_lock);
1168                 break;
1169         case TCP_FIN_WAIT1:
1170                 /* The client initiated a shutdown of the socket */
1171                 xprt->connect_cookie++;
1172                 xprt->reestablish_timeout = 0;
1173                 set_bit(XPRT_CLOSING, &xprt->state);
1174                 smp_mb__before_clear_bit();
1175                 clear_bit(XPRT_CONNECTED, &xprt->state);
1176                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1177                 smp_mb__after_clear_bit();
1178                 break;
1179         case TCP_CLOSE_WAIT:
1180                 /* The server initiated a shutdown of the socket */
1181                 xprt_force_disconnect(xprt);
1182         case TCP_SYN_SENT:
1183                 xprt->connect_cookie++;
1184         case TCP_CLOSING:
1185                 /*
1186                  * If the server closed down the connection, make sure that
1187                  * we back off before reconnecting
1188                  */
1189                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1190                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1191                 break;
1192         case TCP_LAST_ACK:
1193                 set_bit(XPRT_CLOSING, &xprt->state);
1194                 smp_mb__before_clear_bit();
1195                 clear_bit(XPRT_CONNECTED, &xprt->state);
1196                 smp_mb__after_clear_bit();
1197                 break;
1198         case TCP_CLOSE:
1199                 smp_mb__before_clear_bit();
1200                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1201                 clear_bit(XPRT_CLOSING, &xprt->state);
1202                 smp_mb__after_clear_bit();
1203                 /* Mark transport as closed and wake up all pending tasks */
1204                 xprt_disconnect_done(xprt);
1205         }
1206  out:
1207         read_unlock(&sk->sk_callback_lock);
1208 }
1209
1210 /**
1211  * xs_tcp_error_report - callback mainly for catching RST events
1212  * @sk: socket
1213  */
1214 static void xs_tcp_error_report(struct sock *sk)
1215 {
1216         struct rpc_xprt *xprt;
1217
1218         read_lock(&sk->sk_callback_lock);
1219         if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1220                 goto out;
1221         if (!(xprt = xprt_from_sock(sk)))
1222                 goto out;
1223         dprintk("RPC:       %s client %p...\n"
1224                         "RPC:       error %d\n",
1225                         __func__, xprt, sk->sk_err);
1226
1227         xprt_force_disconnect(xprt);
1228 out:
1229         read_unlock(&sk->sk_callback_lock);
1230 }
1231
1232 /**
1233  * xs_udp_write_space - callback invoked when socket buffer space
1234  *                             becomes available
1235  * @sk: socket whose state has changed
1236  *
1237  * Called when more output buffer space is available for this socket.
1238  * We try not to wake our writers until they can make "significant"
1239  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1240  * with a bunch of small requests.
1241  */
1242 static void xs_udp_write_space(struct sock *sk)
1243 {
1244         read_lock(&sk->sk_callback_lock);
1245
1246         /* from net/core/sock.c:sock_def_write_space */
1247         if (sock_writeable(sk)) {
1248                 struct socket *sock;
1249                 struct rpc_xprt *xprt;
1250
1251                 if (unlikely(!(sock = sk->sk_socket)))
1252                         goto out;
1253                 clear_bit(SOCK_NOSPACE, &sock->flags);
1254
1255                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1256                         goto out;
1257                 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1258                         goto out;
1259
1260                 xprt_write_space(xprt);
1261         }
1262
1263  out:
1264         read_unlock(&sk->sk_callback_lock);
1265 }
1266
1267 /**
1268  * xs_tcp_write_space - callback invoked when socket buffer space
1269  *                             becomes available
1270  * @sk: socket whose state has changed
1271  *
1272  * Called when more output buffer space is available for this socket.
1273  * We try not to wake our writers until they can make "significant"
1274  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1275  * with a bunch of small requests.
1276  */
1277 static void xs_tcp_write_space(struct sock *sk)
1278 {
1279         read_lock(&sk->sk_callback_lock);
1280
1281         /* from net/core/stream.c:sk_stream_write_space */
1282         if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1283                 struct socket *sock;
1284                 struct rpc_xprt *xprt;
1285
1286                 if (unlikely(!(sock = sk->sk_socket)))
1287                         goto out;
1288                 clear_bit(SOCK_NOSPACE, &sock->flags);
1289
1290                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1291                         goto out;
1292                 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1293                         goto out;
1294
1295                 xprt_write_space(xprt);
1296         }
1297
1298  out:
1299         read_unlock(&sk->sk_callback_lock);
1300 }
1301
1302 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1303 {
1304         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1305         struct sock *sk = transport->inet;
1306
1307         if (transport->rcvsize) {
1308                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1309                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1310         }
1311         if (transport->sndsize) {
1312                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1313                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1314                 sk->sk_write_space(sk);
1315         }
1316 }
1317
1318 /**
1319  * xs_udp_set_buffer_size - set send and receive limits
1320  * @xprt: generic transport
1321  * @sndsize: requested size of send buffer, in bytes
1322  * @rcvsize: requested size of receive buffer, in bytes
1323  *
1324  * Set socket send and receive buffer size limits.
1325  */
1326 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1327 {
1328         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1329
1330         transport->sndsize = 0;
1331         if (sndsize)
1332                 transport->sndsize = sndsize + 1024;
1333         transport->rcvsize = 0;
1334         if (rcvsize)
1335                 transport->rcvsize = rcvsize + 1024;
1336
1337         xs_udp_do_set_buffer_size(xprt);
1338 }
1339
1340 /**
1341  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1342  * @task: task that timed out
1343  *
1344  * Adjust the congestion window after a retransmit timeout has occurred.
1345  */
1346 static void xs_udp_timer(struct rpc_task *task)
1347 {
1348         xprt_adjust_cwnd(task, -ETIMEDOUT);
1349 }
1350
1351 static unsigned short xs_get_random_port(void)
1352 {
1353         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1354         unsigned short rand = (unsigned short) net_random() % range;
1355         return rand + xprt_min_resvport;
1356 }
1357
1358 /**
1359  * xs_set_port - reset the port number in the remote endpoint address
1360  * @xprt: generic transport
1361  * @port: new port number
1362  *
1363  */
1364 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1365 {
1366         struct sockaddr *addr = xs_addr(xprt);
1367
1368         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1369
1370         switch (addr->sa_family) {
1371         case AF_INET:
1372                 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1373                 break;
1374         case AF_INET6:
1375                 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1376                 break;
1377         default:
1378                 BUG();
1379         }
1380 }
1381
1382 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1383 {
1384         unsigned short port = transport->port;
1385
1386         if (port == 0 && transport->xprt.resvport)
1387                 port = xs_get_random_port();
1388         return port;
1389 }
1390
1391 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1392 {
1393         if (transport->port != 0)
1394                 transport->port = 0;
1395         if (!transport->xprt.resvport)
1396                 return 0;
1397         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1398                 return xprt_max_resvport;
1399         return --port;
1400 }
1401
1402 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1403 {
1404         struct sockaddr_in myaddr = {
1405                 .sin_family = AF_INET,
1406         };
1407         struct sockaddr_in *sa;
1408         int err, nloop = 0;
1409         unsigned short port = xs_get_srcport(transport, sock);
1410         unsigned short last;
1411
1412         sa = (struct sockaddr_in *)&transport->addr;
1413         myaddr.sin_addr = sa->sin_addr;
1414         do {
1415                 myaddr.sin_port = htons(port);
1416                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1417                                                 sizeof(myaddr));
1418                 if (port == 0)
1419                         break;
1420                 if (err == 0) {
1421                         transport->port = port;
1422                         break;
1423                 }
1424                 last = port;
1425                 port = xs_next_srcport(transport, sock, port);
1426                 if (port > last)
1427                         nloop++;
1428         } while (err == -EADDRINUSE && nloop != 2);
1429         dprintk("RPC:       %s %pI4:%u: %s (%d)\n",
1430                         __func__, &myaddr.sin_addr,
1431                         port, err ? "failed" : "ok", err);
1432         return err;
1433 }
1434
1435 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1436 {
1437         struct sockaddr_in6 myaddr = {
1438                 .sin6_family = AF_INET6,
1439         };
1440         struct sockaddr_in6 *sa;
1441         int err, nloop = 0;
1442         unsigned short port = xs_get_srcport(transport, sock);
1443         unsigned short last;
1444
1445         sa = (struct sockaddr_in6 *)&transport->addr;
1446         myaddr.sin6_addr = sa->sin6_addr;
1447         do {
1448                 myaddr.sin6_port = htons(port);
1449                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1450                                                 sizeof(myaddr));
1451                 if (port == 0)
1452                         break;
1453                 if (err == 0) {
1454                         transport->port = port;
1455                         break;
1456                 }
1457                 last = port;
1458                 port = xs_next_srcport(transport, sock, port);
1459                 if (port > last)
1460                         nloop++;
1461         } while (err == -EADDRINUSE && nloop != 2);
1462         dprintk("RPC:       xs_bind6 %pI6:%u: %s (%d)\n",
1463                 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1464         return err;
1465 }
1466
1467 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1468 static struct lock_class_key xs_key[2];
1469 static struct lock_class_key xs_slock_key[2];
1470
1471 static inline void xs_reclassify_socket4(struct socket *sock)
1472 {
1473         struct sock *sk = sock->sk;
1474
1475         BUG_ON(sock_owned_by_user(sk));
1476         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1477                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1478 }
1479
1480 static inline void xs_reclassify_socket6(struct socket *sock)
1481 {
1482         struct sock *sk = sock->sk;
1483
1484         BUG_ON(sock_owned_by_user(sk));
1485         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1486                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1487 }
1488 #else
1489 static inline void xs_reclassify_socket4(struct socket *sock)
1490 {
1491 }
1492
1493 static inline void xs_reclassify_socket6(struct socket *sock)
1494 {
1495 }
1496 #endif
1497
1498 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1499 {
1500         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1501
1502         if (!transport->inet) {
1503                 struct sock *sk = sock->sk;
1504
1505                 write_lock_bh(&sk->sk_callback_lock);
1506
1507                 xs_save_old_callbacks(transport, sk);
1508
1509                 sk->sk_user_data = xprt;
1510                 sk->sk_data_ready = xs_udp_data_ready;
1511                 sk->sk_write_space = xs_udp_write_space;
1512                 sk->sk_no_check = UDP_CSUM_NORCV;
1513                 sk->sk_allocation = GFP_ATOMIC;
1514
1515                 xprt_set_connected(xprt);
1516
1517                 /* Reset to new socket */
1518                 transport->sock = sock;
1519                 transport->inet = sk;
1520
1521                 write_unlock_bh(&sk->sk_callback_lock);
1522         }
1523         xs_udp_do_set_buffer_size(xprt);
1524 }
1525
1526 /**
1527  * xs_udp_connect_worker4 - set up a UDP socket
1528  * @work: RPC transport to connect
1529  *
1530  * Invoked by a work queue tasklet.
1531  */
1532 static void xs_udp_connect_worker4(struct work_struct *work)
1533 {
1534         struct sock_xprt *transport =
1535                 container_of(work, struct sock_xprt, connect_worker.work);
1536         struct rpc_xprt *xprt = &transport->xprt;
1537         struct socket *sock = transport->sock;
1538         int err, status = -EIO;
1539
1540         if (xprt->shutdown)
1541                 goto out;
1542
1543         /* Start by resetting any existing state */
1544         xs_reset_transport(transport);
1545
1546         err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1547         if (err < 0) {
1548                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1549                 goto out;
1550         }
1551         xs_reclassify_socket4(sock);
1552
1553         if (xs_bind4(transport, sock)) {
1554                 sock_release(sock);
1555                 goto out;
1556         }
1557
1558         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1559                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1560
1561         xs_udp_finish_connecting(xprt, sock);
1562         status = 0;
1563 out:
1564         xprt_wake_pending_tasks(xprt, status);
1565         xprt_clear_connecting(xprt);
1566 }
1567
1568 /**
1569  * xs_udp_connect_worker6 - set up a UDP socket
1570  * @work: RPC transport to connect
1571  *
1572  * Invoked by a work queue tasklet.
1573  */
1574 static void xs_udp_connect_worker6(struct work_struct *work)
1575 {
1576         struct sock_xprt *transport =
1577                 container_of(work, struct sock_xprt, connect_worker.work);
1578         struct rpc_xprt *xprt = &transport->xprt;
1579         struct socket *sock = transport->sock;
1580         int err, status = -EIO;
1581
1582         if (xprt->shutdown)
1583                 goto out;
1584
1585         /* Start by resetting any existing state */
1586         xs_reset_transport(transport);
1587
1588         err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1589         if (err < 0) {
1590                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1591                 goto out;
1592         }
1593         xs_reclassify_socket6(sock);
1594
1595         if (xs_bind6(transport, sock) < 0) {
1596                 sock_release(sock);
1597                 goto out;
1598         }
1599
1600         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1601                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1602
1603         xs_udp_finish_connecting(xprt, sock);
1604         status = 0;
1605 out:
1606         xprt_wake_pending_tasks(xprt, status);
1607         xprt_clear_connecting(xprt);
1608 }
1609
1610 /*
1611  * We need to preserve the port number so the reply cache on the server can
1612  * find our cached RPC replies when we get around to reconnecting.
1613  */
1614 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1615 {
1616         int result;
1617         struct sockaddr any;
1618
1619         dprintk("RPC:       disconnecting xprt %p to reuse port\n", xprt);
1620
1621         /*
1622          * Disconnect the transport socket by doing a connect operation
1623          * with AF_UNSPEC.  This should return immediately...
1624          */
1625         memset(&any, 0, sizeof(any));
1626         any.sa_family = AF_UNSPEC;
1627         result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1628         if (result)
1629                 dprintk("RPC:       AF_UNSPEC connect return code %d\n",
1630                                 result);
1631 }
1632
1633 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1634 {
1635         unsigned int state = transport->inet->sk_state;
1636
1637         if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1638                 return;
1639         if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1640                 return;
1641         xs_abort_connection(xprt, transport);
1642 }
1643
1644 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1645 {
1646         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1647
1648         if (!transport->inet) {
1649                 struct sock *sk = sock->sk;
1650
1651                 write_lock_bh(&sk->sk_callback_lock);
1652
1653                 xs_save_old_callbacks(transport, sk);
1654
1655                 sk->sk_user_data = xprt;
1656                 sk->sk_data_ready = xs_tcp_data_ready;
1657                 sk->sk_state_change = xs_tcp_state_change;
1658                 sk->sk_write_space = xs_tcp_write_space;
1659                 sk->sk_error_report = xs_tcp_error_report;
1660                 sk->sk_allocation = GFP_ATOMIC;
1661
1662                 /* socket options */
1663                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1664                 sock_reset_flag(sk, SOCK_LINGER);
1665                 tcp_sk(sk)->linger2 = 0;
1666                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1667
1668                 xprt_clear_connected(xprt);
1669
1670                 /* Reset to new socket */
1671                 transport->sock = sock;
1672                 transport->inet = sk;
1673
1674                 write_unlock_bh(&sk->sk_callback_lock);
1675         }
1676
1677         if (!xprt_bound(xprt))
1678                 return -ENOTCONN;
1679
1680         /* Tell the socket layer to start connecting... */
1681         xprt->stat.connect_count++;
1682         xprt->stat.connect_start = jiffies;
1683         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1684 }
1685
1686 /**
1687  * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1688  * @work: RPC transport to connect
1689  *
1690  * Invoked by a work queue tasklet.
1691  */
1692 static void xs_tcp_connect_worker4(struct work_struct *work)
1693 {
1694         struct sock_xprt *transport =
1695                 container_of(work, struct sock_xprt, connect_worker.work);
1696         struct rpc_xprt *xprt = &transport->xprt;
1697         struct socket *sock = transport->sock;
1698         int err, status = -EIO;
1699
1700         if (xprt->shutdown)
1701                 goto out;
1702
1703         if (!sock) {
1704                 /* start from scratch */
1705                 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1706                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1707                         goto out;
1708                 }
1709                 xs_reclassify_socket4(sock);
1710
1711                 if (xs_bind4(transport, sock) < 0) {
1712                         sock_release(sock);
1713                         goto out;
1714                 }
1715         } else
1716                 /* "close" the socket, preserving the local port */
1717                 xs_tcp_reuse_connection(xprt, transport);
1718
1719         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1720                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1721
1722         status = xs_tcp_finish_connecting(xprt, sock);
1723         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1724                         xprt, -status, xprt_connected(xprt),
1725                         sock->sk->sk_state);
1726         if (status < 0) {
1727                 switch (status) {
1728                         case -EINPROGRESS:
1729                         case -EALREADY:
1730                                 goto out_clear;
1731                         case -ECONNREFUSED:
1732                         case -ECONNRESET:
1733                                 /* retry with existing socket, after a delay */
1734                                 break;
1735                         default:
1736                                 /* get rid of existing socket, and retry */
1737                                 xs_tcp_shutdown(xprt);
1738                 }
1739         }
1740 out:
1741         xprt_wake_pending_tasks(xprt, status);
1742 out_clear:
1743         xprt_clear_connecting(xprt);
1744 }
1745
1746 /**
1747  * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1748  * @work: RPC transport to connect
1749  *
1750  * Invoked by a work queue tasklet.
1751  */
1752 static void xs_tcp_connect_worker6(struct work_struct *work)
1753 {
1754         struct sock_xprt *transport =
1755                 container_of(work, struct sock_xprt, connect_worker.work);
1756         struct rpc_xprt *xprt = &transport->xprt;
1757         struct socket *sock = transport->sock;
1758         int err, status = -EIO;
1759
1760         if (xprt->shutdown)
1761                 goto out;
1762
1763         if (!sock) {
1764                 /* start from scratch */
1765                 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1766                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1767                         goto out;
1768                 }
1769                 xs_reclassify_socket6(sock);
1770
1771                 if (xs_bind6(transport, sock) < 0) {
1772                         sock_release(sock);
1773                         goto out;
1774                 }
1775         } else
1776                 /* "close" the socket, preserving the local port */
1777                 xs_tcp_reuse_connection(xprt, transport);
1778
1779         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1780                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1781
1782         status = xs_tcp_finish_connecting(xprt, sock);
1783         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1784                         xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1785         if (status < 0) {
1786                 switch (status) {
1787                         case -EINPROGRESS:
1788                         case -EALREADY:
1789                                 goto out_clear;
1790                         case -ECONNREFUSED:
1791                         case -ECONNRESET:
1792                                 /* retry with existing socket, after a delay */
1793                                 break;
1794                         default:
1795                                 /* get rid of existing socket, and retry */
1796                                 xs_tcp_shutdown(xprt);
1797                 }
1798         }
1799 out:
1800         xprt_wake_pending_tasks(xprt, status);
1801 out_clear:
1802         xprt_clear_connecting(xprt);
1803 }
1804
1805 /**
1806  * xs_connect - connect a socket to a remote endpoint
1807  * @task: address of RPC task that manages state of connect request
1808  *
1809  * TCP: If the remote end dropped the connection, delay reconnecting.
1810  *
1811  * UDP socket connects are synchronous, but we use a work queue anyway
1812  * to guarantee that even unprivileged user processes can set up a
1813  * socket on a privileged port.
1814  *
1815  * If a UDP socket connect fails, the delay behavior here prevents
1816  * retry floods (hard mounts).
1817  */
1818 static void xs_connect(struct rpc_task *task)
1819 {
1820         struct rpc_xprt *xprt = task->tk_xprt;
1821         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1822
1823         if (xprt_test_and_set_connecting(xprt))
1824                 return;
1825
1826         if (transport->sock != NULL) {
1827                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
1828                                 "seconds\n",
1829                                 xprt, xprt->reestablish_timeout / HZ);
1830                 queue_delayed_work(rpciod_workqueue,
1831                                    &transport->connect_worker,
1832                                    xprt->reestablish_timeout);
1833                 xprt->reestablish_timeout <<= 1;
1834                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1835                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1836         } else {
1837                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
1838                 queue_delayed_work(rpciod_workqueue,
1839                                    &transport->connect_worker, 0);
1840         }
1841 }
1842
1843 static void xs_tcp_connect(struct rpc_task *task)
1844 {
1845         struct rpc_xprt *xprt = task->tk_xprt;
1846
1847         /* Exit if we need to wait for socket shutdown to complete */
1848         if (test_bit(XPRT_CLOSING, &xprt->state))
1849                 return;
1850         xs_connect(task);
1851 }
1852
1853 /**
1854  * xs_udp_print_stats - display UDP socket-specifc stats
1855  * @xprt: rpc_xprt struct containing statistics
1856  * @seq: output file
1857  *
1858  */
1859 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1860 {
1861         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1862
1863         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1864                         transport->port,
1865                         xprt->stat.bind_count,
1866                         xprt->stat.sends,
1867                         xprt->stat.recvs,
1868                         xprt->stat.bad_xids,
1869                         xprt->stat.req_u,
1870                         xprt->stat.bklog_u);
1871 }
1872
1873 /**
1874  * xs_tcp_print_stats - display TCP socket-specifc stats
1875  * @xprt: rpc_xprt struct containing statistics
1876  * @seq: output file
1877  *
1878  */
1879 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1880 {
1881         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1882         long idle_time = 0;
1883
1884         if (xprt_connected(xprt))
1885                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1886
1887         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1888                         transport->port,
1889                         xprt->stat.bind_count,
1890                         xprt->stat.connect_count,
1891                         xprt->stat.connect_time,
1892                         idle_time,
1893                         xprt->stat.sends,
1894                         xprt->stat.recvs,
1895                         xprt->stat.bad_xids,
1896                         xprt->stat.req_u,
1897                         xprt->stat.bklog_u);
1898 }
1899
1900 static struct rpc_xprt_ops xs_udp_ops = {
1901         .set_buffer_size        = xs_udp_set_buffer_size,
1902         .reserve_xprt           = xprt_reserve_xprt_cong,
1903         .release_xprt           = xprt_release_xprt_cong,
1904         .rpcbind                = rpcb_getport_async,
1905         .set_port               = xs_set_port,
1906         .connect                = xs_connect,
1907         .buf_alloc              = rpc_malloc,
1908         .buf_free               = rpc_free,
1909         .send_request           = xs_udp_send_request,
1910         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
1911         .timer                  = xs_udp_timer,
1912         .release_request        = xprt_release_rqst_cong,
1913         .close                  = xs_close,
1914         .destroy                = xs_destroy,
1915         .print_stats            = xs_udp_print_stats,
1916 };
1917
1918 static struct rpc_xprt_ops xs_tcp_ops = {
1919         .reserve_xprt           = xprt_reserve_xprt,
1920         .release_xprt           = xs_tcp_release_xprt,
1921         .rpcbind                = rpcb_getport_async,
1922         .set_port               = xs_set_port,
1923         .connect                = xs_tcp_connect,
1924         .buf_alloc              = rpc_malloc,
1925         .buf_free               = rpc_free,
1926         .send_request           = xs_tcp_send_request,
1927         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
1928         .close                  = xs_tcp_shutdown,
1929         .destroy                = xs_destroy,
1930         .print_stats            = xs_tcp_print_stats,
1931 };
1932
1933 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1934                                       unsigned int slot_table_size)
1935 {
1936         struct rpc_xprt *xprt;
1937         struct sock_xprt *new;
1938
1939         if (args->addrlen > sizeof(xprt->addr)) {
1940                 dprintk("RPC:       xs_setup_xprt: address too large\n");
1941                 return ERR_PTR(-EBADF);
1942         }
1943
1944         new = kzalloc(sizeof(*new), GFP_KERNEL);
1945         if (new == NULL) {
1946                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
1947                                 "rpc_xprt\n");
1948                 return ERR_PTR(-ENOMEM);
1949         }
1950         xprt = &new->xprt;
1951
1952         xprt->max_reqs = slot_table_size;
1953         xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1954         if (xprt->slot == NULL) {
1955                 kfree(xprt);
1956                 dprintk("RPC:       xs_setup_xprt: couldn't allocate slot "
1957                                 "table\n");
1958                 return ERR_PTR(-ENOMEM);
1959         }
1960
1961         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1962         xprt->addrlen = args->addrlen;
1963         if (args->srcaddr)
1964                 memcpy(&new->addr, args->srcaddr, args->addrlen);
1965
1966         return xprt;
1967 }
1968
1969 static const struct rpc_timeout xs_udp_default_timeout = {
1970         .to_initval = 5 * HZ,
1971         .to_maxval = 30 * HZ,
1972         .to_increment = 5 * HZ,
1973         .to_retries = 5,
1974 };
1975
1976 /**
1977  * xs_setup_udp - Set up transport to use a UDP socket
1978  * @args: rpc transport creation arguments
1979  *
1980  */
1981 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1982 {
1983         struct sockaddr *addr = args->dstaddr;
1984         struct rpc_xprt *xprt;
1985         struct sock_xprt *transport;
1986
1987         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1988         if (IS_ERR(xprt))
1989                 return xprt;
1990         transport = container_of(xprt, struct sock_xprt, xprt);
1991
1992         xprt->prot = IPPROTO_UDP;
1993         xprt->tsh_size = 0;
1994         /* XXX: header size can vary due to auth type, IPv6, etc. */
1995         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1996
1997         xprt->bind_timeout = XS_BIND_TO;
1998         xprt->connect_timeout = XS_UDP_CONN_TO;
1999         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2000         xprt->idle_timeout = XS_IDLE_DISC_TO;
2001
2002         xprt->ops = &xs_udp_ops;
2003
2004         xprt->timeout = &xs_udp_default_timeout;
2005
2006         switch (addr->sa_family) {
2007         case AF_INET:
2008                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2009                         xprt_set_bound(xprt);
2010
2011                 INIT_DELAYED_WORK(&transport->connect_worker,
2012                                         xs_udp_connect_worker4);
2013                 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2014                 break;
2015         case AF_INET6:
2016                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2017                         xprt_set_bound(xprt);
2018
2019                 INIT_DELAYED_WORK(&transport->connect_worker,
2020                                         xs_udp_connect_worker6);
2021                 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2022                 break;
2023         default:
2024                 kfree(xprt);
2025                 return ERR_PTR(-EAFNOSUPPORT);
2026         }
2027
2028         dprintk("RPC:       set up transport to address %s\n",
2029                         xprt->address_strings[RPC_DISPLAY_ALL]);
2030
2031         if (try_module_get(THIS_MODULE))
2032                 return xprt;
2033
2034         kfree(xprt->slot);
2035         kfree(xprt);
2036         return ERR_PTR(-EINVAL);
2037 }
2038
2039 static const struct rpc_timeout xs_tcp_default_timeout = {
2040         .to_initval = 60 * HZ,
2041         .to_maxval = 60 * HZ,
2042         .to_retries = 2,
2043 };
2044
2045 /**
2046  * xs_setup_tcp - Set up transport to use a TCP socket
2047  * @args: rpc transport creation arguments
2048  *
2049  */
2050 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2051 {
2052         struct sockaddr *addr = args->dstaddr;
2053         struct rpc_xprt *xprt;
2054         struct sock_xprt *transport;
2055
2056         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2057         if (IS_ERR(xprt))
2058                 return xprt;
2059         transport = container_of(xprt, struct sock_xprt, xprt);
2060
2061         xprt->prot = IPPROTO_TCP;
2062         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2063         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2064
2065         xprt->bind_timeout = XS_BIND_TO;
2066         xprt->connect_timeout = XS_TCP_CONN_TO;
2067         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2068         xprt->idle_timeout = XS_IDLE_DISC_TO;
2069
2070         xprt->ops = &xs_tcp_ops;
2071         xprt->timeout = &xs_tcp_default_timeout;
2072
2073         switch (addr->sa_family) {
2074         case AF_INET:
2075                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2076                         xprt_set_bound(xprt);
2077
2078                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2079                 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2080                 break;
2081         case AF_INET6:
2082                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2083                         xprt_set_bound(xprt);
2084
2085                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2086                 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2087                 break;
2088         default:
2089                 kfree(xprt);
2090                 return ERR_PTR(-EAFNOSUPPORT);
2091         }
2092
2093         dprintk("RPC:       set up transport to address %s\n",
2094                         xprt->address_strings[RPC_DISPLAY_ALL]);
2095
2096         if (try_module_get(THIS_MODULE))
2097                 return xprt;
2098
2099         kfree(xprt->slot);
2100         kfree(xprt);
2101         return ERR_PTR(-EINVAL);
2102 }
2103
2104 static struct xprt_class        xs_udp_transport = {
2105         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
2106         .name           = "udp",
2107         .owner          = THIS_MODULE,
2108         .ident          = IPPROTO_UDP,
2109         .setup          = xs_setup_udp,
2110 };
2111
2112 static struct xprt_class        xs_tcp_transport = {
2113         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
2114         .name           = "tcp",
2115         .owner          = THIS_MODULE,
2116         .ident          = IPPROTO_TCP,
2117         .setup          = xs_setup_tcp,
2118 };
2119
2120 /**
2121  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2122  *
2123  */
2124 int init_socket_xprt(void)
2125 {
2126 #ifdef RPC_DEBUG
2127         if (!sunrpc_table_header)
2128                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2129 #endif
2130
2131         xprt_register_transport(&xs_udp_transport);
2132         xprt_register_transport(&xs_tcp_transport);
2133
2134         return 0;
2135 }
2136
2137 /**
2138  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2139  *
2140  */
2141 void cleanup_socket_xprt(void)
2142 {
2143 #ifdef RPC_DEBUG
2144         if (sunrpc_table_header) {
2145                 unregister_sysctl_table(sunrpc_table_header);
2146                 sunrpc_table_header = NULL;
2147         }
2148 #endif
2149
2150         xprt_unregister_transport(&xs_udp_transport);
2151         xprt_unregister_transport(&xs_tcp_transport);
2152 }