4a567a93e6adea4c9296d97acdf3c49fbc43df45
[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 Software <alan@redhat.com>
7  * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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 };
253
254 /*
255  * TCP receive state flags
256  */
257 #define TCP_RCV_LAST_FRAG       (1UL << 0)
258 #define TCP_RCV_COPY_FRAGHDR    (1UL << 1)
259 #define TCP_RCV_COPY_XID        (1UL << 2)
260 #define TCP_RCV_COPY_DATA       (1UL << 3)
261
262 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
263 {
264         return (struct sockaddr *) &xprt->addr;
265 }
266
267 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
268 {
269         return (struct sockaddr_in *) &xprt->addr;
270 }
271
272 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
273 {
274         return (struct sockaddr_in6 *) &xprt->addr;
275 }
276
277 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
278                                           const char *protocol,
279                                           const char *netid)
280 {
281         struct sockaddr_in *addr = xs_addr_in(xprt);
282         char *buf;
283
284         buf = kzalloc(20, GFP_KERNEL);
285         if (buf) {
286                 snprintf(buf, 20, NIPQUAD_FMT,
287                                 NIPQUAD(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="NIPQUAD_FMT" port=%u proto=%s",
303                         NIPQUAD(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, NIPQUAD_FMT".%u.%u",
326                                 NIPQUAD(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, NIP6_FMT,
345                                 NIP6(addr->sin6_addr));
346         }
347         xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
348
349         buf = kzalloc(8, GFP_KERNEL);
350         if (buf) {
351                 snprintf(buf, 8, "%u",
352                                 ntohs(addr->sin6_port));
353         }
354         xprt->address_strings[RPC_DISPLAY_PORT] = buf;
355
356         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
357
358         buf = kzalloc(64, GFP_KERNEL);
359         if (buf) {
360                 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
361                                 NIP6(addr->sin6_addr),
362                                 ntohs(addr->sin6_port),
363                                 protocol);
364         }
365         xprt->address_strings[RPC_DISPLAY_ALL] = buf;
366
367         buf = kzalloc(36, GFP_KERNEL);
368         if (buf) {
369                 snprintf(buf, 36, NIP6_SEQFMT,
370                                 NIP6(addr->sin6_addr));
371         }
372         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
373
374         buf = kzalloc(8, GFP_KERNEL);
375         if (buf) {
376                 snprintf(buf, 8, "%4hx",
377                                 ntohs(addr->sin6_port));
378         }
379         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
380
381         buf = kzalloc(50, GFP_KERNEL);
382         if (buf) {
383                 snprintf(buf, 50, NIP6_FMT".%u.%u",
384                                 NIP6(addr->sin6_addr),
385                                 ntohs(addr->sin6_port) >> 8,
386                                 ntohs(addr->sin6_port) & 0xff);
387         }
388         xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
389
390         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
391 }
392
393 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
394 {
395         unsigned int i;
396
397         for (i = 0; i < RPC_DISPLAY_MAX; i++)
398                 switch (i) {
399                 case RPC_DISPLAY_PROTO:
400                 case RPC_DISPLAY_NETID:
401                         continue;
402                 default:
403                         kfree(xprt->address_strings[i]);
404                 }
405 }
406
407 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
408
409 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
410 {
411         struct msghdr msg = {
412                 .msg_name       = addr,
413                 .msg_namelen    = addrlen,
414                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
415         };
416         struct kvec iov = {
417                 .iov_base       = vec->iov_base + base,
418                 .iov_len        = vec->iov_len - base,
419         };
420
421         if (iov.iov_len != 0)
422                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
423         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
424 }
425
426 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
427 {
428         struct page **ppage;
429         unsigned int remainder;
430         int err, sent = 0;
431
432         remainder = xdr->page_len - base;
433         base += xdr->page_base;
434         ppage = xdr->pages + (base >> PAGE_SHIFT);
435         base &= ~PAGE_MASK;
436         for(;;) {
437                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
438                 int flags = XS_SENDMSG_FLAGS;
439
440                 remainder -= len;
441                 if (remainder != 0 || more)
442                         flags |= MSG_MORE;
443                 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
444                 if (remainder == 0 || err != len)
445                         break;
446                 sent += err;
447                 ppage++;
448                 base = 0;
449         }
450         if (sent == 0)
451                 return err;
452         if (err > 0)
453                 sent += err;
454         return sent;
455 }
456
457 /**
458  * xs_sendpages - write pages directly to a socket
459  * @sock: socket to send on
460  * @addr: UDP only -- address of destination
461  * @addrlen: UDP only -- length of destination address
462  * @xdr: buffer containing this request
463  * @base: starting position in the buffer
464  *
465  */
466 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
467 {
468         unsigned int remainder = xdr->len - base;
469         int err, sent = 0;
470
471         if (unlikely(!sock))
472                 return -ENOTCONN;
473
474         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
475         if (base != 0) {
476                 addr = NULL;
477                 addrlen = 0;
478         }
479
480         if (base < xdr->head[0].iov_len || addr != NULL) {
481                 unsigned int len = xdr->head[0].iov_len - base;
482                 remainder -= len;
483                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
484                 if (remainder == 0 || err != len)
485                         goto out;
486                 sent += err;
487                 base = 0;
488         } else
489                 base -= xdr->head[0].iov_len;
490
491         if (base < xdr->page_len) {
492                 unsigned int len = xdr->page_len - base;
493                 remainder -= len;
494                 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
495                 if (remainder == 0 || err != len)
496                         goto out;
497                 sent += err;
498                 base = 0;
499         } else
500                 base -= xdr->page_len;
501
502         if (base >= xdr->tail[0].iov_len)
503                 return sent;
504         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
505 out:
506         if (sent == 0)
507                 return err;
508         if (err > 0)
509                 sent += err;
510         return sent;
511 }
512
513 static void xs_nospace_callback(struct rpc_task *task)
514 {
515         struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
516
517         transport->inet->sk_write_pending--;
518         clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
519 }
520
521 /**
522  * xs_nospace - place task on wait queue if transmit was incomplete
523  * @task: task to put to sleep
524  *
525  */
526 static void xs_nospace(struct rpc_task *task)
527 {
528         struct rpc_rqst *req = task->tk_rqstp;
529         struct rpc_xprt *xprt = req->rq_xprt;
530         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
531
532         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
533                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
534                         req->rq_slen);
535
536         /* Protect against races with write_space */
537         spin_lock_bh(&xprt->transport_lock);
538
539         /* Don't race with disconnect */
540         if (xprt_connected(xprt)) {
541                 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
542                         /*
543                          * Notify TCP that we're limited by the application
544                          * window size
545                          */
546                         set_bit(SOCK_NOSPACE, &transport->sock->flags);
547                         transport->inet->sk_write_pending++;
548                         /* ...and wait for more buffer space */
549                         xprt_wait_for_buffer_space(task, xs_nospace_callback);
550                 }
551         } else {
552                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
553                 task->tk_status = -ENOTCONN;
554         }
555
556         spin_unlock_bh(&xprt->transport_lock);
557 }
558
559 /**
560  * xs_udp_send_request - write an RPC request to a UDP socket
561  * @task: address of RPC task that manages the state of an RPC request
562  *
563  * Return values:
564  *        0:    The request has been sent
565  *   EAGAIN:    The socket was blocked, please call again later to
566  *              complete the request
567  * ENOTCONN:    Caller needs to invoke connect logic then call again
568  *    other:    Some other error occured, the request was not sent
569  */
570 static int xs_udp_send_request(struct rpc_task *task)
571 {
572         struct rpc_rqst *req = task->tk_rqstp;
573         struct rpc_xprt *xprt = req->rq_xprt;
574         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
575         struct xdr_buf *xdr = &req->rq_snd_buf;
576         int status;
577
578         xs_pktdump("packet data:",
579                                 req->rq_svec->iov_base,
580                                 req->rq_svec->iov_len);
581
582         req->rq_xtime = jiffies;
583         status = xs_sendpages(transport->sock,
584                               xs_addr(xprt),
585                               xprt->addrlen, xdr,
586                               req->rq_bytes_sent);
587
588         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
589                         xdr->len - req->rq_bytes_sent, status);
590
591         if (status >= 0) {
592                 task->tk_bytes_sent += status;
593                 if (status >= req->rq_slen)
594                         return 0;
595                 /* Still some bytes left; set up for a retry later. */
596                 status = -EAGAIN;
597         }
598
599         switch (status) {
600         case -EAGAIN:
601                 xs_nospace(task);
602                 break;
603         case -ENETUNREACH:
604         case -EPIPE:
605         case -ECONNREFUSED:
606                 /* When the server has died, an ICMP port unreachable message
607                  * prompts ECONNREFUSED. */
608                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
609                 break;
610         default:
611                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
612                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
613                         -status);
614         }
615
616         return status;
617 }
618
619 /**
620  * xs_tcp_shutdown - gracefully shut down a TCP socket
621  * @xprt: transport
622  *
623  * Initiates a graceful shutdown of the TCP socket by calling the
624  * equivalent of shutdown(SHUT_WR);
625  */
626 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
627 {
628         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
629         struct socket *sock = transport->sock;
630
631         if (sock != NULL)
632                 kernel_sock_shutdown(sock, SHUT_WR);
633 }
634
635 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
636 {
637         u32 reclen = buf->len - sizeof(rpc_fraghdr);
638         rpc_fraghdr *base = buf->head[0].iov_base;
639         *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
640 }
641
642 /**
643  * xs_tcp_send_request - write an RPC request to a TCP socket
644  * @task: address of RPC task that manages the state of an RPC request
645  *
646  * Return values:
647  *        0:    The request has been sent
648  *   EAGAIN:    The socket was blocked, please call again later to
649  *              complete the request
650  * ENOTCONN:    Caller needs to invoke connect logic then call again
651  *    other:    Some other error occured, the request was not sent
652  *
653  * XXX: In the case of soft timeouts, should we eventually give up
654  *      if sendmsg is not able to make progress?
655  */
656 static int xs_tcp_send_request(struct rpc_task *task)
657 {
658         struct rpc_rqst *req = task->tk_rqstp;
659         struct rpc_xprt *xprt = req->rq_xprt;
660         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
661         struct xdr_buf *xdr = &req->rq_snd_buf;
662         int status;
663
664         xs_encode_tcp_record_marker(&req->rq_snd_buf);
665
666         xs_pktdump("packet data:",
667                                 req->rq_svec->iov_base,
668                                 req->rq_svec->iov_len);
669
670         /* Continue transmitting the packet/record. We must be careful
671          * to cope with writespace callbacks arriving _after_ we have
672          * called sendmsg(). */
673         while (1) {
674                 req->rq_xtime = jiffies;
675                 status = xs_sendpages(transport->sock,
676                                         NULL, 0, xdr, req->rq_bytes_sent);
677
678                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
679                                 xdr->len - req->rq_bytes_sent, status);
680
681                 if (unlikely(status < 0))
682                         break;
683
684                 /* If we've sent the entire packet, immediately
685                  * reset the count of bytes sent. */
686                 req->rq_bytes_sent += status;
687                 task->tk_bytes_sent += status;
688                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
689                         req->rq_bytes_sent = 0;
690                         return 0;
691                 }
692
693                 if (status != 0)
694                         continue;
695                 status = -EAGAIN;
696                 break;
697         }
698
699         switch (status) {
700         case -EAGAIN:
701                 xs_nospace(task);
702                 break;
703         case -ECONNREFUSED:
704         case -ECONNRESET:
705         case -ENOTCONN:
706         case -EPIPE:
707                 status = -ENOTCONN;
708                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
709                 break;
710         default:
711                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
712                         -status);
713                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
714                 xs_tcp_shutdown(xprt);
715         }
716
717         return status;
718 }
719
720 /**
721  * xs_tcp_release_xprt - clean up after a tcp transmission
722  * @xprt: transport
723  * @task: rpc task
724  *
725  * This cleans up if an error causes us to abort the transmission of a request.
726  * In this case, the socket may need to be reset in order to avoid confusing
727  * the server.
728  */
729 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
730 {
731         struct rpc_rqst *req;
732
733         if (task != xprt->snd_task)
734                 return;
735         if (task == NULL)
736                 goto out_release;
737         req = task->tk_rqstp;
738         if (req->rq_bytes_sent == 0)
739                 goto out_release;
740         if (req->rq_bytes_sent == req->rq_snd_buf.len)
741                 goto out_release;
742         set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
743 out_release:
744         xprt_release_xprt(xprt, task);
745 }
746
747 /**
748  * xs_close - close a socket
749  * @xprt: transport
750  *
751  * This is used when all requests are complete; ie, no DRC state remains
752  * on the server we want to save.
753  */
754 static void xs_close(struct rpc_xprt *xprt)
755 {
756         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
757         struct socket *sock = transport->sock;
758         struct sock *sk = transport->inet;
759
760         if (!sk)
761                 goto clear_close_wait;
762
763         dprintk("RPC:       xs_close xprt %p\n", xprt);
764
765         write_lock_bh(&sk->sk_callback_lock);
766         transport->inet = NULL;
767         transport->sock = NULL;
768
769         sk->sk_user_data = NULL;
770         sk->sk_data_ready = transport->old_data_ready;
771         sk->sk_state_change = transport->old_state_change;
772         sk->sk_write_space = transport->old_write_space;
773         write_unlock_bh(&sk->sk_callback_lock);
774
775         sk->sk_no_check = 0;
776
777         sock_release(sock);
778 clear_close_wait:
779         smp_mb__before_clear_bit();
780         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
781         clear_bit(XPRT_CLOSING, &xprt->state);
782         smp_mb__after_clear_bit();
783         xprt_disconnect_done(xprt);
784 }
785
786 /**
787  * xs_destroy - prepare to shutdown a transport
788  * @xprt: doomed transport
789  *
790  */
791 static void xs_destroy(struct rpc_xprt *xprt)
792 {
793         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
794
795         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
796
797         cancel_rearming_delayed_work(&transport->connect_worker);
798
799         xs_close(xprt);
800         xs_free_peer_addresses(xprt);
801         kfree(xprt->slot);
802         kfree(xprt);
803         module_put(THIS_MODULE);
804 }
805
806 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
807 {
808         return (struct rpc_xprt *) sk->sk_user_data;
809 }
810
811 /**
812  * xs_udp_data_ready - "data ready" callback for UDP sockets
813  * @sk: socket with data to read
814  * @len: how much data to read
815  *
816  */
817 static void xs_udp_data_ready(struct sock *sk, int len)
818 {
819         struct rpc_task *task;
820         struct rpc_xprt *xprt;
821         struct rpc_rqst *rovr;
822         struct sk_buff *skb;
823         int err, repsize, copied;
824         u32 _xid;
825         __be32 *xp;
826
827         read_lock(&sk->sk_callback_lock);
828         dprintk("RPC:       xs_udp_data_ready...\n");
829         if (!(xprt = xprt_from_sock(sk)))
830                 goto out;
831
832         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
833                 goto out;
834
835         if (xprt->shutdown)
836                 goto dropit;
837
838         repsize = skb->len - sizeof(struct udphdr);
839         if (repsize < 4) {
840                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
841                 goto dropit;
842         }
843
844         /* Copy the XID from the skb... */
845         xp = skb_header_pointer(skb, sizeof(struct udphdr),
846                                 sizeof(_xid), &_xid);
847         if (xp == NULL)
848                 goto dropit;
849
850         /* Look up and lock the request corresponding to the given XID */
851         spin_lock(&xprt->transport_lock);
852         rovr = xprt_lookup_rqst(xprt, *xp);
853         if (!rovr)
854                 goto out_unlock;
855         task = rovr->rq_task;
856
857         if ((copied = rovr->rq_private_buf.buflen) > repsize)
858                 copied = repsize;
859
860         /* Suck it into the iovec, verify checksum if not done by hw. */
861         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
862                 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
863                 goto out_unlock;
864         }
865
866         UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
867
868         /* Something worked... */
869         dst_confirm(skb->dst);
870
871         xprt_adjust_cwnd(task, copied);
872         xprt_update_rtt(task);
873         xprt_complete_rqst(task, copied);
874
875  out_unlock:
876         spin_unlock(&xprt->transport_lock);
877  dropit:
878         skb_free_datagram(sk, skb);
879  out:
880         read_unlock(&sk->sk_callback_lock);
881 }
882
883 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
884 {
885         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
886         size_t len, used;
887         char *p;
888
889         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
890         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
891         used = xdr_skb_read_bits(desc, p, len);
892         transport->tcp_offset += used;
893         if (used != len)
894                 return;
895
896         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
897         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
898                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
899         else
900                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
901         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
902
903         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
904         transport->tcp_offset = 0;
905
906         /* Sanity check of the record length */
907         if (unlikely(transport->tcp_reclen < 4)) {
908                 dprintk("RPC:       invalid TCP record fragment length\n");
909                 xprt_force_disconnect(xprt);
910                 return;
911         }
912         dprintk("RPC:       reading TCP record fragment of length %d\n",
913                         transport->tcp_reclen);
914 }
915
916 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
917 {
918         if (transport->tcp_offset == transport->tcp_reclen) {
919                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
920                 transport->tcp_offset = 0;
921                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
922                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
923                         transport->tcp_flags |= TCP_RCV_COPY_XID;
924                         transport->tcp_copied = 0;
925                 }
926         }
927 }
928
929 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
930 {
931         size_t len, used;
932         char *p;
933
934         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
935         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
936         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
937         used = xdr_skb_read_bits(desc, p, len);
938         transport->tcp_offset += used;
939         if (used != len)
940                 return;
941         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
942         transport->tcp_flags |= TCP_RCV_COPY_DATA;
943         transport->tcp_copied = 4;
944         dprintk("RPC:       reading reply for XID %08x\n",
945                         ntohl(transport->tcp_xid));
946         xs_tcp_check_fraghdr(transport);
947 }
948
949 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
950 {
951         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
952         struct rpc_rqst *req;
953         struct xdr_buf *rcvbuf;
954         size_t len;
955         ssize_t r;
956
957         /* Find and lock the request corresponding to this xid */
958         spin_lock(&xprt->transport_lock);
959         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
960         if (!req) {
961                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
962                 dprintk("RPC:       XID %08x request not found!\n",
963                                 ntohl(transport->tcp_xid));
964                 spin_unlock(&xprt->transport_lock);
965                 return;
966         }
967
968         rcvbuf = &req->rq_private_buf;
969         len = desc->count;
970         if (len > transport->tcp_reclen - transport->tcp_offset) {
971                 struct xdr_skb_reader my_desc;
972
973                 len = transport->tcp_reclen - transport->tcp_offset;
974                 memcpy(&my_desc, desc, sizeof(my_desc));
975                 my_desc.count = len;
976                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
977                                           &my_desc, xdr_skb_read_bits);
978                 desc->count -= r;
979                 desc->offset += r;
980         } else
981                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
982                                           desc, xdr_skb_read_bits);
983
984         if (r > 0) {
985                 transport->tcp_copied += r;
986                 transport->tcp_offset += r;
987         }
988         if (r != len) {
989                 /* Error when copying to the receive buffer,
990                  * usually because we weren't able to allocate
991                  * additional buffer pages. All we can do now
992                  * is turn off TCP_RCV_COPY_DATA, so the request
993                  * will not receive any additional updates,
994                  * and time out.
995                  * Any remaining data from this record will
996                  * be discarded.
997                  */
998                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
999                 dprintk("RPC:       XID %08x truncated request\n",
1000                                 ntohl(transport->tcp_xid));
1001                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1002                                 "tcp_offset = %u, tcp_reclen = %u\n",
1003                                 xprt, transport->tcp_copied,
1004                                 transport->tcp_offset, transport->tcp_reclen);
1005                 goto out;
1006         }
1007
1008         dprintk("RPC:       XID %08x read %Zd bytes\n",
1009                         ntohl(transport->tcp_xid), r);
1010         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1011                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1012                         transport->tcp_offset, transport->tcp_reclen);
1013
1014         if (transport->tcp_copied == req->rq_private_buf.buflen)
1015                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1016         else if (transport->tcp_offset == transport->tcp_reclen) {
1017                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1018                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1019         }
1020
1021 out:
1022         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1023                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1024         spin_unlock(&xprt->transport_lock);
1025         xs_tcp_check_fraghdr(transport);
1026 }
1027
1028 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1029 {
1030         size_t len;
1031
1032         len = transport->tcp_reclen - transport->tcp_offset;
1033         if (len > desc->count)
1034                 len = desc->count;
1035         desc->count -= len;
1036         desc->offset += len;
1037         transport->tcp_offset += len;
1038         dprintk("RPC:       discarded %Zu bytes\n", len);
1039         xs_tcp_check_fraghdr(transport);
1040 }
1041
1042 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1043 {
1044         struct rpc_xprt *xprt = rd_desc->arg.data;
1045         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1046         struct xdr_skb_reader desc = {
1047                 .skb    = skb,
1048                 .offset = offset,
1049                 .count  = len,
1050         };
1051
1052         dprintk("RPC:       xs_tcp_data_recv started\n");
1053         do {
1054                 /* Read in a new fragment marker if necessary */
1055                 /* Can we ever really expect to get completely empty fragments? */
1056                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1057                         xs_tcp_read_fraghdr(xprt, &desc);
1058                         continue;
1059                 }
1060                 /* Read in the xid if necessary */
1061                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1062                         xs_tcp_read_xid(transport, &desc);
1063                         continue;
1064                 }
1065                 /* Read in the request data */
1066                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1067                         xs_tcp_read_request(xprt, &desc);
1068                         continue;
1069                 }
1070                 /* Skip over any trailing bytes on short reads */
1071                 xs_tcp_read_discard(transport, &desc);
1072         } while (desc.count);
1073         dprintk("RPC:       xs_tcp_data_recv done\n");
1074         return len - desc.count;
1075 }
1076
1077 /**
1078  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1079  * @sk: socket with data to read
1080  * @bytes: how much data to read
1081  *
1082  */
1083 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1084 {
1085         struct rpc_xprt *xprt;
1086         read_descriptor_t rd_desc;
1087         int read;
1088
1089         dprintk("RPC:       xs_tcp_data_ready...\n");
1090
1091         read_lock(&sk->sk_callback_lock);
1092         if (!(xprt = xprt_from_sock(sk)))
1093                 goto out;
1094         if (xprt->shutdown)
1095                 goto out;
1096
1097         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1098         rd_desc.arg.data = xprt;
1099         do {
1100                 rd_desc.count = 65536;
1101                 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1102         } while (read > 0);
1103 out:
1104         read_unlock(&sk->sk_callback_lock);
1105 }
1106
1107 /**
1108  * xs_tcp_state_change - callback to handle TCP socket state changes
1109  * @sk: socket whose state has changed
1110  *
1111  */
1112 static void xs_tcp_state_change(struct sock *sk)
1113 {
1114         struct rpc_xprt *xprt;
1115
1116         read_lock(&sk->sk_callback_lock);
1117         if (!(xprt = xprt_from_sock(sk)))
1118                 goto out;
1119         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1120         dprintk("RPC:       state %x conn %d dead %d zapped %d\n",
1121                         sk->sk_state, xprt_connected(xprt),
1122                         sock_flag(sk, SOCK_DEAD),
1123                         sock_flag(sk, SOCK_ZAPPED));
1124
1125         switch (sk->sk_state) {
1126         case TCP_ESTABLISHED:
1127                 spin_lock_bh(&xprt->transport_lock);
1128                 if (!xprt_test_and_set_connected(xprt)) {
1129                         struct sock_xprt *transport = container_of(xprt,
1130                                         struct sock_xprt, xprt);
1131
1132                         /* Reset TCP record info */
1133                         transport->tcp_offset = 0;
1134                         transport->tcp_reclen = 0;
1135                         transport->tcp_copied = 0;
1136                         transport->tcp_flags =
1137                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1138
1139                         xprt_wake_pending_tasks(xprt, 0);
1140                 }
1141                 spin_unlock_bh(&xprt->transport_lock);
1142                 break;
1143         case TCP_FIN_WAIT1:
1144                 /* The client initiated a shutdown of the socket */
1145                 xprt->reestablish_timeout = 0;
1146                 set_bit(XPRT_CLOSING, &xprt->state);
1147                 smp_mb__before_clear_bit();
1148                 clear_bit(XPRT_CONNECTED, &xprt->state);
1149                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1150                 smp_mb__after_clear_bit();
1151                 break;
1152         case TCP_CLOSE_WAIT:
1153                 /* The server initiated a shutdown of the socket */
1154                 set_bit(XPRT_CLOSING, &xprt->state);
1155                 xprt_force_disconnect(xprt);
1156         case TCP_SYN_SENT:
1157         case TCP_CLOSING:
1158                 /*
1159                  * If the server closed down the connection, make sure that
1160                  * we back off before reconnecting
1161                  */
1162                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1163                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1164                 break;
1165         case TCP_LAST_ACK:
1166                 smp_mb__before_clear_bit();
1167                 clear_bit(XPRT_CONNECTED, &xprt->state);
1168                 smp_mb__after_clear_bit();
1169                 break;
1170         case TCP_CLOSE:
1171                 smp_mb__before_clear_bit();
1172                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1173                 clear_bit(XPRT_CLOSING, &xprt->state);
1174                 smp_mb__after_clear_bit();
1175                 /* Mark transport as closed and wake up all pending tasks */
1176                 xprt_disconnect_done(xprt);
1177         }
1178  out:
1179         read_unlock(&sk->sk_callback_lock);
1180 }
1181
1182 /**
1183  * xs_udp_write_space - callback invoked when socket buffer space
1184  *                             becomes available
1185  * @sk: socket whose state has changed
1186  *
1187  * Called when more output buffer space is available for this socket.
1188  * We try not to wake our writers until they can make "significant"
1189  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1190  * with a bunch of small requests.
1191  */
1192 static void xs_udp_write_space(struct sock *sk)
1193 {
1194         read_lock(&sk->sk_callback_lock);
1195
1196         /* from net/core/sock.c:sock_def_write_space */
1197         if (sock_writeable(sk)) {
1198                 struct socket *sock;
1199                 struct rpc_xprt *xprt;
1200
1201                 if (unlikely(!(sock = sk->sk_socket)))
1202                         goto out;
1203                 clear_bit(SOCK_NOSPACE, &sock->flags);
1204
1205                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1206                         goto out;
1207                 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1208                         goto out;
1209
1210                 xprt_write_space(xprt);
1211         }
1212
1213  out:
1214         read_unlock(&sk->sk_callback_lock);
1215 }
1216
1217 /**
1218  * xs_tcp_write_space - callback invoked when socket buffer space
1219  *                             becomes available
1220  * @sk: socket whose state has changed
1221  *
1222  * Called when more output buffer space is available for this socket.
1223  * We try not to wake our writers until they can make "significant"
1224  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1225  * with a bunch of small requests.
1226  */
1227 static void xs_tcp_write_space(struct sock *sk)
1228 {
1229         read_lock(&sk->sk_callback_lock);
1230
1231         /* from net/core/stream.c:sk_stream_write_space */
1232         if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1233                 struct socket *sock;
1234                 struct rpc_xprt *xprt;
1235
1236                 if (unlikely(!(sock = sk->sk_socket)))
1237                         goto out;
1238                 clear_bit(SOCK_NOSPACE, &sock->flags);
1239
1240                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1241                         goto out;
1242                 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1243                         goto out;
1244
1245                 xprt_write_space(xprt);
1246         }
1247
1248  out:
1249         read_unlock(&sk->sk_callback_lock);
1250 }
1251
1252 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1253 {
1254         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1255         struct sock *sk = transport->inet;
1256
1257         if (transport->rcvsize) {
1258                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1259                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1260         }
1261         if (transport->sndsize) {
1262                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1263                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1264                 sk->sk_write_space(sk);
1265         }
1266 }
1267
1268 /**
1269  * xs_udp_set_buffer_size - set send and receive limits
1270  * @xprt: generic transport
1271  * @sndsize: requested size of send buffer, in bytes
1272  * @rcvsize: requested size of receive buffer, in bytes
1273  *
1274  * Set socket send and receive buffer size limits.
1275  */
1276 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1277 {
1278         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1279
1280         transport->sndsize = 0;
1281         if (sndsize)
1282                 transport->sndsize = sndsize + 1024;
1283         transport->rcvsize = 0;
1284         if (rcvsize)
1285                 transport->rcvsize = rcvsize + 1024;
1286
1287         xs_udp_do_set_buffer_size(xprt);
1288 }
1289
1290 /**
1291  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1292  * @task: task that timed out
1293  *
1294  * Adjust the congestion window after a retransmit timeout has occurred.
1295  */
1296 static void xs_udp_timer(struct rpc_task *task)
1297 {
1298         xprt_adjust_cwnd(task, -ETIMEDOUT);
1299 }
1300
1301 static unsigned short xs_get_random_port(void)
1302 {
1303         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1304         unsigned short rand = (unsigned short) net_random() % range;
1305         return rand + xprt_min_resvport;
1306 }
1307
1308 /**
1309  * xs_set_port - reset the port number in the remote endpoint address
1310  * @xprt: generic transport
1311  * @port: new port number
1312  *
1313  */
1314 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1315 {
1316         struct sockaddr *addr = xs_addr(xprt);
1317
1318         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1319
1320         switch (addr->sa_family) {
1321         case AF_INET:
1322                 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1323                 break;
1324         case AF_INET6:
1325                 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1326                 break;
1327         default:
1328                 BUG();
1329         }
1330 }
1331
1332 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1333 {
1334         unsigned short port = transport->port;
1335
1336         if (port == 0 && transport->xprt.resvport)
1337                 port = xs_get_random_port();
1338         return port;
1339 }
1340
1341 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1342 {
1343         if (transport->port != 0)
1344                 transport->port = 0;
1345         if (!transport->xprt.resvport)
1346                 return 0;
1347         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1348                 return xprt_max_resvport;
1349         return --port;
1350 }
1351
1352 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1353 {
1354         struct sockaddr_in myaddr = {
1355                 .sin_family = AF_INET,
1356         };
1357         struct sockaddr_in *sa;
1358         int err, nloop = 0;
1359         unsigned short port = xs_get_srcport(transport, sock);
1360         unsigned short last;
1361
1362         sa = (struct sockaddr_in *)&transport->addr;
1363         myaddr.sin_addr = sa->sin_addr;
1364         do {
1365                 myaddr.sin_port = htons(port);
1366                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1367                                                 sizeof(myaddr));
1368                 if (port == 0)
1369                         break;
1370                 if (err == 0) {
1371                         transport->port = port;
1372                         break;
1373                 }
1374                 last = port;
1375                 port = xs_next_srcport(transport, sock, port);
1376                 if (port > last)
1377                         nloop++;
1378         } while (err == -EADDRINUSE && nloop != 2);
1379         dprintk("RPC:       %s "NIPQUAD_FMT":%u: %s (%d)\n",
1380                         __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1381                         port, err ? "failed" : "ok", err);
1382         return err;
1383 }
1384
1385 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1386 {
1387         struct sockaddr_in6 myaddr = {
1388                 .sin6_family = AF_INET6,
1389         };
1390         struct sockaddr_in6 *sa;
1391         int err, nloop = 0;
1392         unsigned short port = xs_get_srcport(transport, sock);
1393         unsigned short last;
1394
1395         sa = (struct sockaddr_in6 *)&transport->addr;
1396         myaddr.sin6_addr = sa->sin6_addr;
1397         do {
1398                 myaddr.sin6_port = htons(port);
1399                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1400                                                 sizeof(myaddr));
1401                 if (port == 0)
1402                         break;
1403                 if (err == 0) {
1404                         transport->port = port;
1405                         break;
1406                 }
1407                 last = port;
1408                 port = xs_next_srcport(transport, sock, port);
1409                 if (port > last)
1410                         nloop++;
1411         } while (err == -EADDRINUSE && nloop != 2);
1412         dprintk("RPC:       xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1413                 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1414         return err;
1415 }
1416
1417 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1418 static struct lock_class_key xs_key[2];
1419 static struct lock_class_key xs_slock_key[2];
1420
1421 static inline void xs_reclassify_socket4(struct socket *sock)
1422 {
1423         struct sock *sk = sock->sk;
1424
1425         BUG_ON(sock_owned_by_user(sk));
1426         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1427                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1428 }
1429
1430 static inline void xs_reclassify_socket6(struct socket *sock)
1431 {
1432         struct sock *sk = sock->sk;
1433
1434         BUG_ON(sock_owned_by_user(sk));
1435         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1436                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1437 }
1438 #else
1439 static inline void xs_reclassify_socket4(struct socket *sock)
1440 {
1441 }
1442
1443 static inline void xs_reclassify_socket6(struct socket *sock)
1444 {
1445 }
1446 #endif
1447
1448 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1449 {
1450         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1451
1452         if (!transport->inet) {
1453                 struct sock *sk = sock->sk;
1454
1455                 write_lock_bh(&sk->sk_callback_lock);
1456
1457                 sk->sk_user_data = xprt;
1458                 transport->old_data_ready = sk->sk_data_ready;
1459                 transport->old_state_change = sk->sk_state_change;
1460                 transport->old_write_space = sk->sk_write_space;
1461                 sk->sk_data_ready = xs_udp_data_ready;
1462                 sk->sk_write_space = xs_udp_write_space;
1463                 sk->sk_no_check = UDP_CSUM_NORCV;
1464                 sk->sk_allocation = GFP_ATOMIC;
1465
1466                 xprt_set_connected(xprt);
1467
1468                 /* Reset to new socket */
1469                 transport->sock = sock;
1470                 transport->inet = sk;
1471
1472                 write_unlock_bh(&sk->sk_callback_lock);
1473         }
1474         xs_udp_do_set_buffer_size(xprt);
1475 }
1476
1477 /**
1478  * xs_udp_connect_worker4 - set up a UDP socket
1479  * @work: RPC transport to connect
1480  *
1481  * Invoked by a work queue tasklet.
1482  */
1483 static void xs_udp_connect_worker4(struct work_struct *work)
1484 {
1485         struct sock_xprt *transport =
1486                 container_of(work, struct sock_xprt, connect_worker.work);
1487         struct rpc_xprt *xprt = &transport->xprt;
1488         struct socket *sock = transport->sock;
1489         int err, status = -EIO;
1490
1491         if (xprt->shutdown || !xprt_bound(xprt))
1492                 goto out;
1493
1494         /* Start by resetting any existing state */
1495         xs_close(xprt);
1496
1497         if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1498                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1499                 goto out;
1500         }
1501         xs_reclassify_socket4(sock);
1502
1503         if (xs_bind4(transport, sock)) {
1504                 sock_release(sock);
1505                 goto out;
1506         }
1507
1508         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1509                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1510
1511         xs_udp_finish_connecting(xprt, sock);
1512         status = 0;
1513 out:
1514         xprt_wake_pending_tasks(xprt, status);
1515         xprt_clear_connecting(xprt);
1516 }
1517
1518 /**
1519  * xs_udp_connect_worker6 - set up a UDP socket
1520  * @work: RPC transport to connect
1521  *
1522  * Invoked by a work queue tasklet.
1523  */
1524 static void xs_udp_connect_worker6(struct work_struct *work)
1525 {
1526         struct sock_xprt *transport =
1527                 container_of(work, struct sock_xprt, connect_worker.work);
1528         struct rpc_xprt *xprt = &transport->xprt;
1529         struct socket *sock = transport->sock;
1530         int err, status = -EIO;
1531
1532         if (xprt->shutdown || !xprt_bound(xprt))
1533                 goto out;
1534
1535         /* Start by resetting any existing state */
1536         xs_close(xprt);
1537
1538         if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1539                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1540                 goto out;
1541         }
1542         xs_reclassify_socket6(sock);
1543
1544         if (xs_bind6(transport, sock) < 0) {
1545                 sock_release(sock);
1546                 goto out;
1547         }
1548
1549         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1550                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1551
1552         xs_udp_finish_connecting(xprt, sock);
1553         status = 0;
1554 out:
1555         xprt_wake_pending_tasks(xprt, status);
1556         xprt_clear_connecting(xprt);
1557 }
1558
1559 /*
1560  * We need to preserve the port number so the reply cache on the server can
1561  * find our cached RPC replies when we get around to reconnecting.
1562  */
1563 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1564 {
1565         int result;
1566         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1567         struct sockaddr any;
1568
1569         dprintk("RPC:       disconnecting xprt %p to reuse port\n", xprt);
1570
1571         /*
1572          * Disconnect the transport socket by doing a connect operation
1573          * with AF_UNSPEC.  This should return immediately...
1574          */
1575         memset(&any, 0, sizeof(any));
1576         any.sa_family = AF_UNSPEC;
1577         result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1578         if (result)
1579                 dprintk("RPC:       AF_UNSPEC connect return code %d\n",
1580                                 result);
1581 }
1582
1583 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1584 {
1585         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1586
1587         if (!transport->inet) {
1588                 struct sock *sk = sock->sk;
1589
1590                 write_lock_bh(&sk->sk_callback_lock);
1591
1592                 sk->sk_user_data = xprt;
1593                 transport->old_data_ready = sk->sk_data_ready;
1594                 transport->old_state_change = sk->sk_state_change;
1595                 transport->old_write_space = sk->sk_write_space;
1596                 sk->sk_data_ready = xs_tcp_data_ready;
1597                 sk->sk_state_change = xs_tcp_state_change;
1598                 sk->sk_write_space = xs_tcp_write_space;
1599                 sk->sk_allocation = GFP_ATOMIC;
1600
1601                 /* socket options */
1602                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1603                 sock_reset_flag(sk, SOCK_LINGER);
1604                 tcp_sk(sk)->linger2 = 0;
1605                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1606
1607                 xprt_clear_connected(xprt);
1608
1609                 /* Reset to new socket */
1610                 transport->sock = sock;
1611                 transport->inet = sk;
1612
1613                 write_unlock_bh(&sk->sk_callback_lock);
1614         }
1615
1616         /* Tell the socket layer to start connecting... */
1617         xprt->stat.connect_count++;
1618         xprt->stat.connect_start = jiffies;
1619         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1620 }
1621
1622 /**
1623  * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1624  * @work: RPC transport to connect
1625  *
1626  * Invoked by a work queue tasklet.
1627  */
1628 static void xs_tcp_connect_worker4(struct work_struct *work)
1629 {
1630         struct sock_xprt *transport =
1631                 container_of(work, struct sock_xprt, connect_worker.work);
1632         struct rpc_xprt *xprt = &transport->xprt;
1633         struct socket *sock = transport->sock;
1634         int err, status = -EIO;
1635
1636         if (xprt->shutdown || !xprt_bound(xprt))
1637                 goto out;
1638
1639         if (!sock) {
1640                 /* start from scratch */
1641                 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1642                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1643                         goto out;
1644                 }
1645                 xs_reclassify_socket4(sock);
1646
1647                 if (xs_bind4(transport, sock) < 0) {
1648                         sock_release(sock);
1649                         goto out;
1650                 }
1651         } else
1652                 /* "close" the socket, preserving the local port */
1653                 xs_tcp_reuse_connection(xprt);
1654
1655         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1656                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1657
1658         status = xs_tcp_finish_connecting(xprt, sock);
1659         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1660                         xprt, -status, xprt_connected(xprt),
1661                         sock->sk->sk_state);
1662         if (status < 0) {
1663                 switch (status) {
1664                         case -EINPROGRESS:
1665                         case -EALREADY:
1666                                 goto out_clear;
1667                         case -ECONNREFUSED:
1668                         case -ECONNRESET:
1669                                 /* retry with existing socket, after a delay */
1670                                 break;
1671                         default:
1672                                 /* get rid of existing socket, and retry */
1673                                 xs_tcp_shutdown(xprt);
1674                 }
1675         }
1676 out:
1677         xprt_wake_pending_tasks(xprt, status);
1678 out_clear:
1679         xprt_clear_connecting(xprt);
1680 }
1681
1682 /**
1683  * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1684  * @work: RPC transport to connect
1685  *
1686  * Invoked by a work queue tasklet.
1687  */
1688 static void xs_tcp_connect_worker6(struct work_struct *work)
1689 {
1690         struct sock_xprt *transport =
1691                 container_of(work, struct sock_xprt, connect_worker.work);
1692         struct rpc_xprt *xprt = &transport->xprt;
1693         struct socket *sock = transport->sock;
1694         int err, status = -EIO;
1695
1696         if (xprt->shutdown || !xprt_bound(xprt))
1697                 goto out;
1698
1699         if (!sock) {
1700                 /* start from scratch */
1701                 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1702                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1703                         goto out;
1704                 }
1705                 xs_reclassify_socket6(sock);
1706
1707                 if (xs_bind6(transport, sock) < 0) {
1708                         sock_release(sock);
1709                         goto out;
1710                 }
1711         } else
1712                 /* "close" the socket, preserving the local port */
1713                 xs_tcp_reuse_connection(xprt);
1714
1715         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1716                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1717
1718         status = xs_tcp_finish_connecting(xprt, sock);
1719         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1720                         xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1721         if (status < 0) {
1722                 switch (status) {
1723                         case -EINPROGRESS:
1724                         case -EALREADY:
1725                                 goto out_clear;
1726                         case -ECONNREFUSED:
1727                         case -ECONNRESET:
1728                                 /* retry with existing socket, after a delay */
1729                                 break;
1730                         default:
1731                                 /* get rid of existing socket, and retry */
1732                                 xs_tcp_shutdown(xprt);
1733                 }
1734         }
1735 out:
1736         xprt_wake_pending_tasks(xprt, status);
1737 out_clear:
1738         xprt_clear_connecting(xprt);
1739 }
1740
1741 /**
1742  * xs_connect - connect a socket to a remote endpoint
1743  * @task: address of RPC task that manages state of connect request
1744  *
1745  * TCP: If the remote end dropped the connection, delay reconnecting.
1746  *
1747  * UDP socket connects are synchronous, but we use a work queue anyway
1748  * to guarantee that even unprivileged user processes can set up a
1749  * socket on a privileged port.
1750  *
1751  * If a UDP socket connect fails, the delay behavior here prevents
1752  * retry floods (hard mounts).
1753  */
1754 static void xs_connect(struct rpc_task *task)
1755 {
1756         struct rpc_xprt *xprt = task->tk_xprt;
1757         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1758
1759         if (xprt_test_and_set_connecting(xprt))
1760                 return;
1761
1762         if (transport->sock != NULL) {
1763                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
1764                                 "seconds\n",
1765                                 xprt, xprt->reestablish_timeout / HZ);
1766                 queue_delayed_work(rpciod_workqueue,
1767                                    &transport->connect_worker,
1768                                    xprt->reestablish_timeout);
1769                 xprt->reestablish_timeout <<= 1;
1770                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1771                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1772         } else {
1773                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
1774                 queue_delayed_work(rpciod_workqueue,
1775                                    &transport->connect_worker, 0);
1776         }
1777 }
1778
1779 static void xs_tcp_connect(struct rpc_task *task)
1780 {
1781         struct rpc_xprt *xprt = task->tk_xprt;
1782
1783         /* Initiate graceful shutdown of the socket if not already done */
1784         if (test_bit(XPRT_CONNECTED, &xprt->state))
1785                 xs_tcp_shutdown(xprt);
1786         /* Exit if we need to wait for socket shutdown to complete */
1787         if (test_bit(XPRT_CLOSING, &xprt->state))
1788                 return;
1789         xs_connect(task);
1790 }
1791
1792 /**
1793  * xs_udp_print_stats - display UDP socket-specifc stats
1794  * @xprt: rpc_xprt struct containing statistics
1795  * @seq: output file
1796  *
1797  */
1798 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1799 {
1800         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1801
1802         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1803                         transport->port,
1804                         xprt->stat.bind_count,
1805                         xprt->stat.sends,
1806                         xprt->stat.recvs,
1807                         xprt->stat.bad_xids,
1808                         xprt->stat.req_u,
1809                         xprt->stat.bklog_u);
1810 }
1811
1812 /**
1813  * xs_tcp_print_stats - display TCP socket-specifc stats
1814  * @xprt: rpc_xprt struct containing statistics
1815  * @seq: output file
1816  *
1817  */
1818 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1819 {
1820         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1821         long idle_time = 0;
1822
1823         if (xprt_connected(xprt))
1824                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1825
1826         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1827                         transport->port,
1828                         xprt->stat.bind_count,
1829                         xprt->stat.connect_count,
1830                         xprt->stat.connect_time,
1831                         idle_time,
1832                         xprt->stat.sends,
1833                         xprt->stat.recvs,
1834                         xprt->stat.bad_xids,
1835                         xprt->stat.req_u,
1836                         xprt->stat.bklog_u);
1837 }
1838
1839 static struct rpc_xprt_ops xs_udp_ops = {
1840         .set_buffer_size        = xs_udp_set_buffer_size,
1841         .reserve_xprt           = xprt_reserve_xprt_cong,
1842         .release_xprt           = xprt_release_xprt_cong,
1843         .rpcbind                = rpcb_getport_async,
1844         .set_port               = xs_set_port,
1845         .connect                = xs_connect,
1846         .buf_alloc              = rpc_malloc,
1847         .buf_free               = rpc_free,
1848         .send_request           = xs_udp_send_request,
1849         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
1850         .timer                  = xs_udp_timer,
1851         .release_request        = xprt_release_rqst_cong,
1852         .close                  = xs_close,
1853         .destroy                = xs_destroy,
1854         .print_stats            = xs_udp_print_stats,
1855 };
1856
1857 static struct rpc_xprt_ops xs_tcp_ops = {
1858         .reserve_xprt           = xprt_reserve_xprt,
1859         .release_xprt           = xs_tcp_release_xprt,
1860         .rpcbind                = rpcb_getport_async,
1861         .set_port               = xs_set_port,
1862         .connect                = xs_tcp_connect,
1863         .buf_alloc              = rpc_malloc,
1864         .buf_free               = rpc_free,
1865         .send_request           = xs_tcp_send_request,
1866         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
1867         .close                  = xs_tcp_shutdown,
1868         .destroy                = xs_destroy,
1869         .print_stats            = xs_tcp_print_stats,
1870 };
1871
1872 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1873                                       unsigned int slot_table_size)
1874 {
1875         struct rpc_xprt *xprt;
1876         struct sock_xprt *new;
1877
1878         if (args->addrlen > sizeof(xprt->addr)) {
1879                 dprintk("RPC:       xs_setup_xprt: address too large\n");
1880                 return ERR_PTR(-EBADF);
1881         }
1882
1883         new = kzalloc(sizeof(*new), GFP_KERNEL);
1884         if (new == NULL) {
1885                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
1886                                 "rpc_xprt\n");
1887                 return ERR_PTR(-ENOMEM);
1888         }
1889         xprt = &new->xprt;
1890
1891         xprt->max_reqs = slot_table_size;
1892         xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1893         if (xprt->slot == NULL) {
1894                 kfree(xprt);
1895                 dprintk("RPC:       xs_setup_xprt: couldn't allocate slot "
1896                                 "table\n");
1897                 return ERR_PTR(-ENOMEM);
1898         }
1899
1900         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1901         xprt->addrlen = args->addrlen;
1902         if (args->srcaddr)
1903                 memcpy(&new->addr, args->srcaddr, args->addrlen);
1904
1905         return xprt;
1906 }
1907
1908 static const struct rpc_timeout xs_udp_default_timeout = {
1909         .to_initval = 5 * HZ,
1910         .to_maxval = 30 * HZ,
1911         .to_increment = 5 * HZ,
1912         .to_retries = 5,
1913 };
1914
1915 /**
1916  * xs_setup_udp - Set up transport to use a UDP socket
1917  * @args: rpc transport creation arguments
1918  *
1919  */
1920 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1921 {
1922         struct sockaddr *addr = args->dstaddr;
1923         struct rpc_xprt *xprt;
1924         struct sock_xprt *transport;
1925
1926         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1927         if (IS_ERR(xprt))
1928                 return xprt;
1929         transport = container_of(xprt, struct sock_xprt, xprt);
1930
1931         xprt->prot = IPPROTO_UDP;
1932         xprt->tsh_size = 0;
1933         /* XXX: header size can vary due to auth type, IPv6, etc. */
1934         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1935
1936         xprt->bind_timeout = XS_BIND_TO;
1937         xprt->connect_timeout = XS_UDP_CONN_TO;
1938         xprt->reestablish_timeout = XS_UDP_REEST_TO;
1939         xprt->idle_timeout = XS_IDLE_DISC_TO;
1940
1941         xprt->ops = &xs_udp_ops;
1942
1943         xprt->timeout = &xs_udp_default_timeout;
1944
1945         switch (addr->sa_family) {
1946         case AF_INET:
1947                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1948                         xprt_set_bound(xprt);
1949
1950                 INIT_DELAYED_WORK(&transport->connect_worker,
1951                                         xs_udp_connect_worker4);
1952                 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1953                 break;
1954         case AF_INET6:
1955                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1956                         xprt_set_bound(xprt);
1957
1958                 INIT_DELAYED_WORK(&transport->connect_worker,
1959                                         xs_udp_connect_worker6);
1960                 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1961                 break;
1962         default:
1963                 kfree(xprt);
1964                 return ERR_PTR(-EAFNOSUPPORT);
1965         }
1966
1967         dprintk("RPC:       set up transport to address %s\n",
1968                         xprt->address_strings[RPC_DISPLAY_ALL]);
1969
1970         if (try_module_get(THIS_MODULE))
1971                 return xprt;
1972
1973         kfree(xprt->slot);
1974         kfree(xprt);
1975         return ERR_PTR(-EINVAL);
1976 }
1977
1978 static const struct rpc_timeout xs_tcp_default_timeout = {
1979         .to_initval = 60 * HZ,
1980         .to_maxval = 60 * HZ,
1981         .to_retries = 2,
1982 };
1983
1984 /**
1985  * xs_setup_tcp - Set up transport to use a TCP socket
1986  * @args: rpc transport creation arguments
1987  *
1988  */
1989 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1990 {
1991         struct sockaddr *addr = args->dstaddr;
1992         struct rpc_xprt *xprt;
1993         struct sock_xprt *transport;
1994
1995         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1996         if (IS_ERR(xprt))
1997                 return xprt;
1998         transport = container_of(xprt, struct sock_xprt, xprt);
1999
2000         xprt->prot = IPPROTO_TCP;
2001         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2002         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2003
2004         xprt->bind_timeout = XS_BIND_TO;
2005         xprt->connect_timeout = XS_TCP_CONN_TO;
2006         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2007         xprt->idle_timeout = XS_IDLE_DISC_TO;
2008
2009         xprt->ops = &xs_tcp_ops;
2010         xprt->timeout = &xs_tcp_default_timeout;
2011
2012         switch (addr->sa_family) {
2013         case AF_INET:
2014                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2015                         xprt_set_bound(xprt);
2016
2017                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2018                 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2019                 break;
2020         case AF_INET6:
2021                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2022                         xprt_set_bound(xprt);
2023
2024                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2025                 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2026                 break;
2027         default:
2028                 kfree(xprt);
2029                 return ERR_PTR(-EAFNOSUPPORT);
2030         }
2031
2032         dprintk("RPC:       set up transport to address %s\n",
2033                         xprt->address_strings[RPC_DISPLAY_ALL]);
2034
2035         if (try_module_get(THIS_MODULE))
2036                 return xprt;
2037
2038         kfree(xprt->slot);
2039         kfree(xprt);
2040         return ERR_PTR(-EINVAL);
2041 }
2042
2043 static struct xprt_class        xs_udp_transport = {
2044         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
2045         .name           = "udp",
2046         .owner          = THIS_MODULE,
2047         .ident          = IPPROTO_UDP,
2048         .setup          = xs_setup_udp,
2049 };
2050
2051 static struct xprt_class        xs_tcp_transport = {
2052         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
2053         .name           = "tcp",
2054         .owner          = THIS_MODULE,
2055         .ident          = IPPROTO_TCP,
2056         .setup          = xs_setup_tcp,
2057 };
2058
2059 /**
2060  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2061  *
2062  */
2063 int init_socket_xprt(void)
2064 {
2065 #ifdef RPC_DEBUG
2066         if (!sunrpc_table_header)
2067                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2068 #endif
2069
2070         xprt_register_transport(&xs_udp_transport);
2071         xprt_register_transport(&xs_tcp_transport);
2072
2073         return 0;
2074 }
2075
2076 /**
2077  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2078  *
2079  */
2080 void cleanup_socket_xprt(void)
2081 {
2082 #ifdef RPC_DEBUG
2083         if (sunrpc_table_header) {
2084                 unregister_sysctl_table(sunrpc_table_header);
2085                 sunrpc_table_header = NULL;
2086         }
2087 #endif
2088
2089         xprt_unregister_transport(&xs_udp_transport);
2090         xprt_unregister_transport(&xs_tcp_transport);
2091 }