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elf: fix one check-after-use
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / svcsock.c
blob9d504234af4a664f5f116171b9d6e02825d1ac4f
1 /*
2 * linux/net/sunrpc/svcsock.c
3 *
4 * These are the RPC server socket internals.
5 *
6 * The server scheduling algorithm does not always distribute the load
7 * evenly when servicing a single client. May need to modify the
8 * svc_xprt_enqueue procedure...
9 *
10 * TCP support is largely untested and may be a little slow. The problem
11 * is that we currently do two separate recvfrom's, one for the 4-byte
12 * record length, and the second for the actual record. This could possibly
13 * be improved by always reading a minimum size of around 100 bytes and
14 * tucking any superfluous bytes away in a temporary store. Still, that
15 * leaves write requests out in the rain. An alternative may be to peek at
16 * the first skb in the queue, and if it matches the next TCP sequence
17 * number, to extract the record marker. Yuck.
18 *
19 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/errno.h>
25 #include <linux/fcntl.h>
26 #include <linux/net.h>
27 #include <linux/in.h>
28 #include <linux/inet.h>
29 #include <linux/udp.h>
30 #include <linux/tcp.h>
31 #include <linux/unistd.h>
32 #include <linux/slab.h>
33 #include <linux/netdevice.h>
34 #include <linux/skbuff.h>
35 #include <linux/file.h>
36 #include <linux/freezer.h>
37 #include <net/sock.h>
38 #include <net/checksum.h>
39 #include <net/ip.h>
40 #include <net/ipv6.h>
41 #include <net/tcp.h>
42 #include <net/tcp_states.h>
43 #include <asm/uaccess.h>
44 #include <asm/ioctls.h>
45
46 #include <linux/sunrpc/types.h>
47 #include <linux/sunrpc/clnt.h>
48 #include <linux/sunrpc/xdr.h>
49 #include <linux/sunrpc/msg_prot.h>
50 #include <linux/sunrpc/svcsock.h>
51 #include <linux/sunrpc/stats.h>
52
53 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
54
55
56 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
57 int *errp, int flags);
58 static void svc_udp_data_ready(struct sock *, int);
59 static int svc_udp_recvfrom(struct svc_rqst *);
60 static int svc_udp_sendto(struct svc_rqst *);
61 static void svc_sock_detach(struct svc_xprt *);
62 static void svc_tcp_sock_detach(struct svc_xprt *);
63 static void svc_sock_free(struct svc_xprt *);
64
65 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
66 struct sockaddr *, int, int);
67 #ifdef CONFIG_DEBUG_LOCK_ALLOC
68 static struct lock_class_key svc_key[2];
69 static struct lock_class_key svc_slock_key[2];
70
71 static void svc_reclassify_socket(struct socket *sock)
72 {
73 struct sock *sk = sock->sk;
74 BUG_ON(sock_owned_by_user(sk));
75 switch (sk->sk_family) {
76 case AF_INET:
77 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
78 &svc_slock_key[0],
79 "sk_xprt.xpt_lock-AF_INET-NFSD",
80 &svc_key[0]);
81 break;
82
83 case AF_INET6:
84 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
85 &svc_slock_key[1],
86 "sk_xprt.xpt_lock-AF_INET6-NFSD",
87 &svc_key[1]);
88 break;
89
90 default:
91 BUG();
92 }
93 }
94 #else
95 static void svc_reclassify_socket(struct socket *sock)
96 {
97 }
98 #endif
99
100 /*
101 * Release an skbuff after use
102 */
103 static void svc_release_skb(struct svc_rqst *rqstp)
104 {
105 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
106
107 if (skb) {
108 struct svc_sock *svsk =
109 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
110 rqstp->rq_xprt_ctxt = NULL;
111
112 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
113 skb_free_datagram(svsk->sk_sk, skb);
114 }
115 }
116
117 union svc_pktinfo_u {
118 struct in_pktinfo pkti;
119 struct in6_pktinfo pkti6;
120 };
121 #define SVC_PKTINFO_SPACE \
122 CMSG_SPACE(sizeof(union svc_pktinfo_u))
123
124 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
125 {
126 struct svc_sock *svsk =
127 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
128 switch (svsk->sk_sk->sk_family) {
129 case AF_INET: {
130 struct in_pktinfo *pki = CMSG_DATA(cmh);
131
132 cmh->cmsg_level = SOL_IP;
133 cmh->cmsg_type = IP_PKTINFO;
134 pki->ipi_ifindex = 0;
135 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
136 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
137 }
138 break;
139
140 case AF_INET6: {
141 struct in6_pktinfo *pki = CMSG_DATA(cmh);
142
143 cmh->cmsg_level = SOL_IPV6;
144 cmh->cmsg_type = IPV6_PKTINFO;
145 pki->ipi6_ifindex = 0;
146 ipv6_addr_copy(&pki->ipi6_addr,
147 &rqstp->rq_daddr.addr6);
148 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
149 }
150 break;
151 }
152 return;
153 }
154
155 /*
156 * Generic sendto routine
157 */
158 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
159 {
160 struct svc_sock *svsk =
161 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
162 struct socket *sock = svsk->sk_sock;
163 int slen;
164 union {
165 struct cmsghdr hdr;
166 long all[SVC_PKTINFO_SPACE / sizeof(long)];
167 } buffer;
168 struct cmsghdr *cmh = &buffer.hdr;
169 int len = 0;
170 int result;
171 int size;
172 struct page **ppage = xdr->pages;
173 size_t base = xdr->page_base;
174 unsigned int pglen = xdr->page_len;
175 unsigned int flags = MSG_MORE;
176 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
177
178 slen = xdr->len;
179
180 if (rqstp->rq_prot == IPPROTO_UDP) {
181 struct msghdr msg = {
182 .msg_name = &rqstp->rq_addr,
183 .msg_namelen = rqstp->rq_addrlen,
184 .msg_control = cmh,
185 .msg_controllen = sizeof(buffer),
186 .msg_flags = MSG_MORE,
187 };
188
189 svc_set_cmsg_data(rqstp, cmh);
190
191 if (sock_sendmsg(sock, &msg, 0) < 0)
192 goto out;
193 }
194
195 /* send head */
196 if (slen == xdr->head[0].iov_len)
197 flags = 0;
198 len = kernel_sendpage(sock, rqstp->rq_respages[0], 0,
199 xdr->head[0].iov_len, flags);
200 if (len != xdr->head[0].iov_len)
201 goto out;
202 slen -= xdr->head[0].iov_len;
203 if (slen == 0)
204 goto out;
205
206 /* send page data */
207 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
208 while (pglen > 0) {
209 if (slen == size)
210 flags = 0;
211 result = kernel_sendpage(sock, *ppage, base, size, flags);
212 if (result > 0)
213 len += result;
214 if (result != size)
215 goto out;
216 slen -= size;
217 pglen -= size;
218 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
219 base = 0;
220 ppage++;
221 }
222 /* send tail */
223 if (xdr->tail[0].iov_len) {
224 result = kernel_sendpage(sock, rqstp->rq_respages[0],
225 ((unsigned long)xdr->tail[0].iov_base)
226 & (PAGE_SIZE-1),
227 xdr->tail[0].iov_len, 0);
228
229 if (result > 0)
230 len += result;
231 }
232 out:
233 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
234 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
235 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
236
237 return len;
238 }
239
240 /*
241 * Report socket names for nfsdfs
242 */
243 static int one_sock_name(char *buf, struct svc_sock *svsk)
244 {
245 int len;
246
247 switch(svsk->sk_sk->sk_family) {
248 case AF_INET:
249 len = sprintf(buf, "ipv4 %s %pI4 %d\n",
250 svsk->sk_sk->sk_protocol == IPPROTO_UDP ?
251 "udp" : "tcp",
252 &inet_sk(svsk->sk_sk)->rcv_saddr,
253 inet_sk(svsk->sk_sk)->num);
254 break;
255 default:
256 len = sprintf(buf, "*unknown-%d*\n",
257 svsk->sk_sk->sk_family);
258 }
259 return len;
260 }
261
262 int
263 svc_sock_names(char *buf, struct svc_serv *serv, char *toclose)
264 {
265 struct svc_sock *svsk, *closesk = NULL;
266 int len = 0;
267
268 if (!serv)
269 return 0;
270 spin_lock_bh(&serv->sv_lock);
271 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
272 int onelen = one_sock_name(buf+len, svsk);
273 if (toclose && strcmp(toclose, buf+len) == 0)
274 closesk = svsk;
275 else
276 len += onelen;
277 }
278 spin_unlock_bh(&serv->sv_lock);
279 if (closesk)
280 /* Should unregister with portmap, but you cannot
281 * unregister just one protocol...
282 */
283 svc_close_xprt(&closesk->sk_xprt);
284 else if (toclose)
285 return -ENOENT;
286 return len;
287 }
288 EXPORT_SYMBOL_GPL(svc_sock_names);
289
290 /*
291 * Check input queue length
292 */
293 static int svc_recv_available(struct svc_sock *svsk)
294 {
295 struct socket *sock = svsk->sk_sock;
296 int avail, err;
297
298 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
299
300 return (err >= 0)? avail : err;
301 }
302
303 /*
304 * Generic recvfrom routine.
305 */
306 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
307 int buflen)
308 {
309 struct svc_sock *svsk =
310 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
311 struct msghdr msg = {
312 .msg_flags = MSG_DONTWAIT,
313 };
314 int len;
315
316 rqstp->rq_xprt_hlen = 0;
317
318 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
319 msg.msg_flags);
320
321 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
322 svsk, iov[0].iov_base, iov[0].iov_len, len);
323 return len;
324 }
325
326 /*
327 * Set socket snd and rcv buffer lengths
328 */
329 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
330 unsigned int rcv)
331 {
332 #if 0
333 mm_segment_t oldfs;
334 oldfs = get_fs(); set_fs(KERNEL_DS);
335 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
336 (char*)&snd, sizeof(snd));
337 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
338 (char*)&rcv, sizeof(rcv));
339 #else
340 /* sock_setsockopt limits use to sysctl_?mem_max,
341 * which isn't acceptable. Until that is made conditional
342 * on not having CAP_SYS_RESOURCE or similar, we go direct...
343 * DaveM said I could!
344 */
345 lock_sock(sock->sk);
346 sock->sk->sk_sndbuf = snd * 2;
347 sock->sk->sk_rcvbuf = rcv * 2;
348 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
349 release_sock(sock->sk);
350 #endif
351 }
352 /*
353 * INET callback when data has been received on the socket.
354 */
355 static void svc_udp_data_ready(struct sock *sk, int count)
356 {
357 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
358
359 if (svsk) {
360 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
361 svsk, sk, count,
362 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
363 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
364 svc_xprt_enqueue(&svsk->sk_xprt);
365 }
366 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
367 wake_up_interruptible(sk->sk_sleep);
368 }
369
370 /*
371 * INET callback when space is newly available on the socket.
372 */
373 static void svc_write_space(struct sock *sk)
374 {
375 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
376
377 if (svsk) {
378 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
379 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
380 svc_xprt_enqueue(&svsk->sk_xprt);
381 }
382
383 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
384 dprintk("RPC svc_write_space: someone sleeping on %p\n",
385 svsk);
386 wake_up_interruptible(sk->sk_sleep);
387 }
388 }
389
390 /*
391 * Copy the UDP datagram's destination address to the rqstp structure.
392 * The 'destination' address in this case is the address to which the
393 * peer sent the datagram, i.e. our local address. For multihomed
394 * hosts, this can change from msg to msg. Note that only the IP
395 * address changes, the port number should remain the same.
396 */
397 static void svc_udp_get_dest_address(struct svc_rqst *rqstp,
398 struct cmsghdr *cmh)
399 {
400 struct svc_sock *svsk =
401 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
402 switch (svsk->sk_sk->sk_family) {
403 case AF_INET: {
404 struct in_pktinfo *pki = CMSG_DATA(cmh);
405 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
406 break;
407 }
408 case AF_INET6: {
409 struct in6_pktinfo *pki = CMSG_DATA(cmh);
410 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
411 break;
412 }
413 }
414 }
415
416 /*
417 * Receive a datagram from a UDP socket.
418 */
419 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
420 {
421 struct svc_sock *svsk =
422 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
423 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
424 struct sk_buff *skb;
425 union {
426 struct cmsghdr hdr;
427 long all[SVC_PKTINFO_SPACE / sizeof(long)];
428 } buffer;
429 struct cmsghdr *cmh = &buffer.hdr;
430 int err, len;
431 struct msghdr msg = {
432 .msg_name = svc_addr(rqstp),
433 .msg_control = cmh,
434 .msg_controllen = sizeof(buffer),
435 .msg_flags = MSG_DONTWAIT,
436 };
437
438 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
439 /* udp sockets need large rcvbuf as all pending
440 * requests are still in that buffer. sndbuf must
441 * also be large enough that there is enough space
442 * for one reply per thread. We count all threads
443 * rather than threads in a particular pool, which
444 * provides an upper bound on the number of threads
445 * which will access the socket.
446 */
447 svc_sock_setbufsize(svsk->sk_sock,
448 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
449 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
450
451 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
452 skb = NULL;
453 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
454 0, 0, MSG_PEEK | MSG_DONTWAIT);
455 if (err >= 0)
456 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
457
458 if (skb == NULL) {
459 if (err != -EAGAIN) {
460 /* possibly an icmp error */
461 dprintk("svc: recvfrom returned error %d\n", -err);
462 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
463 }
464 svc_xprt_received(&svsk->sk_xprt);
465 return -EAGAIN;
466 }
467 len = svc_addr_len(svc_addr(rqstp));
468 if (len < 0)
469 return len;
470 rqstp->rq_addrlen = len;
471 if (skb->tstamp.tv64 == 0) {
472 skb->tstamp = ktime_get_real();
473 /* Don't enable netstamp, sunrpc doesn't
474 need that much accuracy */
475 }
476 svsk->sk_sk->sk_stamp = skb->tstamp;
477 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
478
479 /*
480 * Maybe more packets - kick another thread ASAP.
481 */
482 svc_xprt_received(&svsk->sk_xprt);
483
484 len = skb->len - sizeof(struct udphdr);
485 rqstp->rq_arg.len = len;
486
487 rqstp->rq_prot = IPPROTO_UDP;
488
489 if (cmh->cmsg_level != IPPROTO_IP ||
490 cmh->cmsg_type != IP_PKTINFO) {
491 if (net_ratelimit())
492 printk("rpcsvc: received unknown control message:"
493 "%d/%d\n",
494 cmh->cmsg_level, cmh->cmsg_type);
495 skb_free_datagram(svsk->sk_sk, skb);
496 return 0;
497 }
498 svc_udp_get_dest_address(rqstp, cmh);
499
500 if (skb_is_nonlinear(skb)) {
501 /* we have to copy */
502 local_bh_disable();
503 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
504 local_bh_enable();
505 /* checksum error */
506 skb_free_datagram(svsk->sk_sk, skb);
507 return 0;
508 }
509 local_bh_enable();
510 skb_free_datagram(svsk->sk_sk, skb);
511 } else {
512 /* we can use it in-place */
513 rqstp->rq_arg.head[0].iov_base = skb->data +
514 sizeof(struct udphdr);
515 rqstp->rq_arg.head[0].iov_len = len;
516 if (skb_checksum_complete(skb)) {
517 skb_free_datagram(svsk->sk_sk, skb);
518 return 0;
519 }
520 rqstp->rq_xprt_ctxt = skb;
521 }
522
523 rqstp->rq_arg.page_base = 0;
524 if (len <= rqstp->rq_arg.head[0].iov_len) {
525 rqstp->rq_arg.head[0].iov_len = len;
526 rqstp->rq_arg.page_len = 0;
527 rqstp->rq_respages = rqstp->rq_pages+1;
528 } else {
529 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
530 rqstp->rq_respages = rqstp->rq_pages + 1 +
531 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
532 }
533
534 if (serv->sv_stats)
535 serv->sv_stats->netudpcnt++;
536
537 return len;
538 }
539
540 static int
541 svc_udp_sendto(struct svc_rqst *rqstp)
542 {
543 int error;
544
545 error = svc_sendto(rqstp, &rqstp->rq_res);
546 if (error == -ECONNREFUSED)
547 /* ICMP error on earlier request. */
548 error = svc_sendto(rqstp, &rqstp->rq_res);
549
550 return error;
551 }
552
553 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
554 {
555 }
556
557 static int svc_udp_has_wspace(struct svc_xprt *xprt)
558 {
559 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
560 struct svc_serv *serv = xprt->xpt_server;
561 unsigned long required;
562
563 /*
564 * Set the SOCK_NOSPACE flag before checking the available
565 * sock space.
566 */
567 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
568 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
569 if (required*2 > sock_wspace(svsk->sk_sk))
570 return 0;
571 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
572 return 1;
573 }
574
575 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
576 {
577 BUG();
578 return NULL;
579 }
580
581 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
582 struct sockaddr *sa, int salen,
583 int flags)
584 {
585 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
586 }
587
588 static struct svc_xprt_ops svc_udp_ops = {
589 .xpo_create = svc_udp_create,
590 .xpo_recvfrom = svc_udp_recvfrom,
591 .xpo_sendto = svc_udp_sendto,
592 .xpo_release_rqst = svc_release_skb,
593 .xpo_detach = svc_sock_detach,
594 .xpo_free = svc_sock_free,
595 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
596 .xpo_has_wspace = svc_udp_has_wspace,
597 .xpo_accept = svc_udp_accept,
598 };
599
600 static struct svc_xprt_class svc_udp_class = {
601 .xcl_name = "udp",
602 .xcl_owner = THIS_MODULE,
603 .xcl_ops = &svc_udp_ops,
604 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
605 };
606
607 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
608 {
609 int one = 1;
610 mm_segment_t oldfs;
611
612 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
613 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
614 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
615 svsk->sk_sk->sk_write_space = svc_write_space;
616
617 /* initialise setting must have enough space to
618 * receive and respond to one request.
619 * svc_udp_recvfrom will re-adjust if necessary
620 */
621 svc_sock_setbufsize(svsk->sk_sock,
622 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
623 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
624
625 /* data might have come in before data_ready set up */
626 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
627 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
628
629 oldfs = get_fs();
630 set_fs(KERNEL_DS);
631 /* make sure we get destination address info */
632 svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO,
633 (char __user *)&one, sizeof(one));
634 set_fs(oldfs);
635 }
636
637 /*
638 * A data_ready event on a listening socket means there's a connection
639 * pending. Do not use state_change as a substitute for it.
640 */
641 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
642 {
643 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
644
645 dprintk("svc: socket %p TCP (listen) state change %d\n",
646 sk, sk->sk_state);
647
648 /*
649 * This callback may called twice when a new connection
650 * is established as a child socket inherits everything
651 * from a parent LISTEN socket.
652 * 1) data_ready method of the parent socket will be called
653 * when one of child sockets become ESTABLISHED.
654 * 2) data_ready method of the child socket may be called
655 * when it receives data before the socket is accepted.
656 * In case of 2, we should ignore it silently.
657 */
658 if (sk->sk_state == TCP_LISTEN) {
659 if (svsk) {
660 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
661 svc_xprt_enqueue(&svsk->sk_xprt);
662 } else
663 printk("svc: socket %p: no user data\n", sk);
664 }
665
666 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
667 wake_up_interruptible_all(sk->sk_sleep);
668 }
669
670 /*
671 * A state change on a connected socket means it's dying or dead.
672 */
673 static void svc_tcp_state_change(struct sock *sk)
674 {
675 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
676
677 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
678 sk, sk->sk_state, sk->sk_user_data);
679
680 if (!svsk)
681 printk("svc: socket %p: no user data\n", sk);
682 else {
683 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
684 svc_xprt_enqueue(&svsk->sk_xprt);
685 }
686 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
687 wake_up_interruptible_all(sk->sk_sleep);
688 }
689
690 static void svc_tcp_data_ready(struct sock *sk, int count)
691 {
692 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
693
694 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
695 sk, sk->sk_user_data);
696 if (svsk) {
697 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
698 svc_xprt_enqueue(&svsk->sk_xprt);
699 }
700 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
701 wake_up_interruptible(sk->sk_sleep);
702 }
703
704 /*
705 * Accept a TCP connection
706 */
707 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
708 {
709 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
710 struct sockaddr_storage addr;
711 struct sockaddr *sin = (struct sockaddr *) &addr;
712 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
713 struct socket *sock = svsk->sk_sock;
714 struct socket *newsock;
715 struct svc_sock *newsvsk;
716 int err, slen;
717 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
718
719 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
720 if (!sock)
721 return NULL;
722
723 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
724 err = kernel_accept(sock, &newsock, O_NONBLOCK);
725 if (err < 0) {
726 if (err == -ENOMEM)
727 printk(KERN_WARNING "%s: no more sockets!\n",
728 serv->sv_name);
729 else if (err != -EAGAIN && net_ratelimit())
730 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
731 serv->sv_name, -err);
732 return NULL;
733 }
734 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
735
736 err = kernel_getpeername(newsock, sin, &slen);
737 if (err < 0) {
738 if (net_ratelimit())
739 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
740 serv->sv_name, -err);
741 goto failed; /* aborted connection or whatever */
742 }
743
744 /* Ideally, we would want to reject connections from unauthorized
745 * hosts here, but when we get encryption, the IP of the host won't
746 * tell us anything. For now just warn about unpriv connections.
747 */
748 if (!svc_port_is_privileged(sin)) {
749 dprintk(KERN_WARNING
750 "%s: connect from unprivileged port: %s\n",
751 serv->sv_name,
752 __svc_print_addr(sin, buf, sizeof(buf)));
753 }
754 dprintk("%s: connect from %s\n", serv->sv_name,
755 __svc_print_addr(sin, buf, sizeof(buf)));
756
757 /* make sure that a write doesn't block forever when
758 * low on memory
759 */
760 newsock->sk->sk_sndtimeo = HZ*30;
761
762 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
763 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
764 goto failed;
765 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
766 err = kernel_getsockname(newsock, sin, &slen);
767 if (unlikely(err < 0)) {
768 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
769 slen = offsetof(struct sockaddr, sa_data);
770 }
771 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
772
773 if (serv->sv_stats)
774 serv->sv_stats->nettcpconn++;
775
776 return &newsvsk->sk_xprt;
777
778 failed:
779 sock_release(newsock);
780 return NULL;
781 }
782
783 /*
784 * Receive data from a TCP socket.
785 */
786 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
787 {
788 struct svc_sock *svsk =
789 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
790 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
791 int len;
792 struct kvec *vec;
793 int pnum, vlen;
794
795 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
796 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
797 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
798 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
799
800 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
801 /* sndbuf needs to have room for one request
802 * per thread, otherwise we can stall even when the
803 * network isn't a bottleneck.
804 *
805 * We count all threads rather than threads in a
806 * particular pool, which provides an upper bound
807 * on the number of threads which will access the socket.
808 *
809 * rcvbuf just needs to be able to hold a few requests.
810 * Normally they will be removed from the queue
811 * as soon a a complete request arrives.
812 */
813 svc_sock_setbufsize(svsk->sk_sock,
814 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
815 3 * serv->sv_max_mesg);
816
817 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
818
819 /* Receive data. If we haven't got the record length yet, get
820 * the next four bytes. Otherwise try to gobble up as much as
821 * possible up to the complete record length.
822 */
823 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
824 int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
825 struct kvec iov;
826
827 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
828 iov.iov_len = want;
829 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
830 goto error;
831 svsk->sk_tcplen += len;
832
833 if (len < want) {
834 dprintk("svc: short recvfrom while reading record "
835 "length (%d of %d)\n", len, want);
836 svc_xprt_received(&svsk->sk_xprt);
837 return -EAGAIN; /* record header not complete */
838 }
839
840 svsk->sk_reclen = ntohl(svsk->sk_reclen);
841 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
842 /* FIXME: technically, a record can be fragmented,
843 * and non-terminal fragments will not have the top
844 * bit set in the fragment length header.
845 * But apparently no known nfs clients send fragmented
846 * records. */
847 if (net_ratelimit())
848 printk(KERN_NOTICE "RPC: multiple fragments "
849 "per record not supported\n");
850 goto err_delete;
851 }
852 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
853 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
854 if (svsk->sk_reclen > serv->sv_max_mesg) {
855 if (net_ratelimit())
856 printk(KERN_NOTICE "RPC: "
857 "fragment too large: 0x%08lx\n",
858 (unsigned long)svsk->sk_reclen);
859 goto err_delete;
860 }
861 }
862
863 /* Check whether enough data is available */
864 len = svc_recv_available(svsk);
865 if (len < 0)
866 goto error;
867
868 if (len < svsk->sk_reclen) {
869 dprintk("svc: incomplete TCP record (%d of %d)\n",
870 len, svsk->sk_reclen);
871 svc_xprt_received(&svsk->sk_xprt);
872 return -EAGAIN; /* record not complete */
873 }
874 len = svsk->sk_reclen;
875 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
876
877 vec = rqstp->rq_vec;
878 vec[0] = rqstp->rq_arg.head[0];
879 vlen = PAGE_SIZE;
880 pnum = 1;
881 while (vlen < len) {
882 vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]);
883 vec[pnum].iov_len = PAGE_SIZE;
884 pnum++;
885 vlen += PAGE_SIZE;
886 }
887 rqstp->rq_respages = &rqstp->rq_pages[pnum];
888
889 /* Now receive data */
890 len = svc_recvfrom(rqstp, vec, pnum, len);
891 if (len < 0)
892 goto error;
893
894 dprintk("svc: TCP complete record (%d bytes)\n", len);
895 rqstp->rq_arg.len = len;
896 rqstp->rq_arg.page_base = 0;
897 if (len <= rqstp->rq_arg.head[0].iov_len) {
898 rqstp->rq_arg.head[0].iov_len = len;
899 rqstp->rq_arg.page_len = 0;
900 } else {
901 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
902 }
903
904 rqstp->rq_xprt_ctxt = NULL;
905 rqstp->rq_prot = IPPROTO_TCP;
906
907 /* Reset TCP read info */
908 svsk->sk_reclen = 0;
909 svsk->sk_tcplen = 0;
910
911 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
912 svc_xprt_received(&svsk->sk_xprt);
913 if (serv->sv_stats)
914 serv->sv_stats->nettcpcnt++;
915
916 return len;
917
918 err_delete:
919 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
920 return -EAGAIN;
921
922 error:
923 if (len == -EAGAIN) {
924 dprintk("RPC: TCP recvfrom got EAGAIN\n");
925 svc_xprt_received(&svsk->sk_xprt);
926 } else {
927 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
928 svsk->sk_xprt.xpt_server->sv_name, -len);
929 goto err_delete;
930 }
931
932 return len;
933 }
934
935 /*
936 * Send out data on TCP socket.
937 */
938 static int svc_tcp_sendto(struct svc_rqst *rqstp)
939 {
940 struct xdr_buf *xbufp = &rqstp->rq_res;
941 int sent;
942 __be32 reclen;
943
944 /* Set up the first element of the reply kvec.
945 * Any other kvecs that may be in use have been taken
946 * care of by the server implementation itself.
947 */
948 reclen = htonl(0x80000000|((xbufp->len ) - 4));
949 memcpy(xbufp->head[0].iov_base, &reclen, 4);
950
951 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
952 return -ENOTCONN;
953
954 sent = svc_sendto(rqstp, &rqstp->rq_res);
955 if (sent != xbufp->len) {
956 printk(KERN_NOTICE
957 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
958 "- shutting down socket\n",
959 rqstp->rq_xprt->xpt_server->sv_name,
960 (sent<0)?"got error":"sent only",
961 sent, xbufp->len);
962 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
963 svc_xprt_enqueue(rqstp->rq_xprt);
964 sent = -EAGAIN;
965 }
966 return sent;
967 }
968
969 /*
970 * Setup response header. TCP has a 4B record length field.
971 */
972 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
973 {
974 struct kvec *resv = &rqstp->rq_res.head[0];
975
976 /* tcp needs a space for the record length... */
977 svc_putnl(resv, 0);
978 }
979
980 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
981 {
982 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
983 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
984 int required;
985 int wspace;
986
987 /*
988 * Set the SOCK_NOSPACE flag before checking the available
989 * sock space.
990 */
991 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
992 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
993 wspace = sk_stream_wspace(svsk->sk_sk);
994
995 if (wspace < sk_stream_min_wspace(svsk->sk_sk))
996 return 0;
997 if (required * 2 > wspace)
998 return 0;
999
1000 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1001 return 1;
1002 }
1003
1004 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1005 struct sockaddr *sa, int salen,
1006 int flags)
1007 {
1008 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1009 }
1010
1011 static struct svc_xprt_ops svc_tcp_ops = {
1012 .xpo_create = svc_tcp_create,
1013 .xpo_recvfrom = svc_tcp_recvfrom,
1014 .xpo_sendto = svc_tcp_sendto,
1015 .xpo_release_rqst = svc_release_skb,
1016 .xpo_detach = svc_tcp_sock_detach,
1017 .xpo_free = svc_sock_free,
1018 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1019 .xpo_has_wspace = svc_tcp_has_wspace,
1020 .xpo_accept = svc_tcp_accept,
1021 };
1022
1023 static struct svc_xprt_class svc_tcp_class = {
1024 .xcl_name = "tcp",
1025 .xcl_owner = THIS_MODULE,
1026 .xcl_ops = &svc_tcp_ops,
1027 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1028 };
1029
1030 void svc_init_xprt_sock(void)
1031 {
1032 svc_reg_xprt_class(&svc_tcp_class);
1033 svc_reg_xprt_class(&svc_udp_class);
1034 }
1035
1036 void svc_cleanup_xprt_sock(void)
1037 {
1038 svc_unreg_xprt_class(&svc_tcp_class);
1039 svc_unreg_xprt_class(&svc_udp_class);
1040 }
1041
1042 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1043 {
1044 struct sock *sk = svsk->sk_sk;
1045
1046 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
1047 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1048 if (sk->sk_state == TCP_LISTEN) {
1049 dprintk("setting up TCP socket for listening\n");
1050 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1051 sk->sk_data_ready = svc_tcp_listen_data_ready;
1052 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1053 } else {
1054 dprintk("setting up TCP socket for reading\n");
1055 sk->sk_state_change = svc_tcp_state_change;
1056 sk->sk_data_ready = svc_tcp_data_ready;
1057 sk->sk_write_space = svc_write_space;
1058
1059 svsk->sk_reclen = 0;
1060 svsk->sk_tcplen = 0;
1061
1062 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1063
1064 /* initialise setting must have enough space to
1065 * receive and respond to one request.
1066 * svc_tcp_recvfrom will re-adjust if necessary
1067 */
1068 svc_sock_setbufsize(svsk->sk_sock,
1069 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1070 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1071
1072 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1073 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1074 if (sk->sk_state != TCP_ESTABLISHED)
1075 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1076 }
1077 }
1078
1079 void svc_sock_update_bufs(struct svc_serv *serv)
1080 {
1081 /*
1082 * The number of server threads has changed. Update
1083 * rcvbuf and sndbuf accordingly on all sockets
1084 */
1085 struct list_head *le;
1086
1087 spin_lock_bh(&serv->sv_lock);
1088 list_for_each(le, &serv->sv_permsocks) {
1089 struct svc_sock *svsk =
1090 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1091 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1092 }
1093 list_for_each(le, &serv->sv_tempsocks) {
1094 struct svc_sock *svsk =
1095 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1096 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1097 }
1098 spin_unlock_bh(&serv->sv_lock);
1099 }
1100 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1101
1102 /*
1103 * Initialize socket for RPC use and create svc_sock struct
1104 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1105 */
1106 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1107 struct socket *sock,
1108 int *errp, int flags)
1109 {
1110 struct svc_sock *svsk;
1111 struct sock *inet;
1112 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1113
1114 dprintk("svc: svc_setup_socket %p\n", sock);
1115 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
1116 *errp = -ENOMEM;
1117 return NULL;
1118 }
1119
1120 inet = sock->sk;
1121
1122 /* Register socket with portmapper */
1123 if (*errp >= 0 && pmap_register)
1124 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
1125 ntohs(inet_sk(inet)->sport));
1126
1127 if (*errp < 0) {
1128 kfree(svsk);
1129 return NULL;
1130 }
1131
1132 inet->sk_user_data = svsk;
1133 svsk->sk_sock = sock;
1134 svsk->sk_sk = inet;
1135 svsk->sk_ostate = inet->sk_state_change;
1136 svsk->sk_odata = inet->sk_data_ready;
1137 svsk->sk_owspace = inet->sk_write_space;
1138
1139 /* Initialize the socket */
1140 if (sock->type == SOCK_DGRAM)
1141 svc_udp_init(svsk, serv);
1142 else
1143 svc_tcp_init(svsk, serv);
1144
1145 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1146 svsk, svsk->sk_sk);
1147
1148 return svsk;
1149 }
1150
1151 int svc_addsock(struct svc_serv *serv,
1152 int fd,
1153 char *name_return)
1154 {
1155 int err = 0;
1156 struct socket *so = sockfd_lookup(fd, &err);
1157 struct svc_sock *svsk = NULL;
1158
1159 if (!so)
1160 return err;
1161 if (so->sk->sk_family != AF_INET)
1162 err = -EAFNOSUPPORT;
1163 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1164 so->sk->sk_protocol != IPPROTO_UDP)
1165 err = -EPROTONOSUPPORT;
1166 else if (so->state > SS_UNCONNECTED)
1167 err = -EISCONN;
1168 else {
1169 if (!try_module_get(THIS_MODULE))
1170 err = -ENOENT;
1171 else
1172 svsk = svc_setup_socket(serv, so, &err,
1173 SVC_SOCK_DEFAULTS);
1174 if (svsk) {
1175 struct sockaddr_storage addr;
1176 struct sockaddr *sin = (struct sockaddr *)&addr;
1177 int salen;
1178 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1179 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1180 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1181 spin_lock_bh(&serv->sv_lock);
1182 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1183 spin_unlock_bh(&serv->sv_lock);
1184 svc_xprt_received(&svsk->sk_xprt);
1185 err = 0;
1186 } else
1187 module_put(THIS_MODULE);
1188 }
1189 if (err) {
1190 sockfd_put(so);
1191 return err;
1192 }
1193 return one_sock_name(name_return, svsk);
1194 }
1195 EXPORT_SYMBOL_GPL(svc_addsock);
1196
1197 /*
1198 * Create socket for RPC service.
1199 */
1200 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1201 int protocol,
1202 struct sockaddr *sin, int len,
1203 int flags)
1204 {
1205 struct svc_sock *svsk;
1206 struct socket *sock;
1207 int error;
1208 int type;
1209 struct sockaddr_storage addr;
1210 struct sockaddr *newsin = (struct sockaddr *)&addr;
1211 int newlen;
1212 int family;
1213 int val;
1214 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1215
1216 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1217 serv->sv_program->pg_name, protocol,
1218 __svc_print_addr(sin, buf, sizeof(buf)));
1219
1220 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1221 printk(KERN_WARNING "svc: only UDP and TCP "
1222 "sockets supported\n");
1223 return ERR_PTR(-EINVAL);
1224 }
1225
1226 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1227 switch (sin->sa_family) {
1228 case AF_INET6:
1229 family = PF_INET6;
1230 break;
1231 case AF_INET:
1232 family = PF_INET;
1233 break;
1234 default:
1235 return ERR_PTR(-EINVAL);
1236 }
1237
1238 error = sock_create_kern(family, type, protocol, &sock);
1239 if (error < 0)
1240 return ERR_PTR(error);
1241
1242 svc_reclassify_socket(sock);
1243
1244 /*
1245 * If this is an PF_INET6 listener, we want to avoid
1246 * getting requests from IPv4 remotes. Those should
1247 * be shunted to a PF_INET listener via rpcbind.
1248 */
1249 val = 1;
1250 if (family == PF_INET6)
1251 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1252 (char *)&val, sizeof(val));
1253
1254 if (type == SOCK_STREAM)
1255 sock->sk->sk_reuse = 1; /* allow address reuse */
1256 error = kernel_bind(sock, sin, len);
1257 if (error < 0)
1258 goto bummer;
1259
1260 newlen = len;
1261 error = kernel_getsockname(sock, newsin, &newlen);
1262 if (error < 0)
1263 goto bummer;
1264
1265 if (protocol == IPPROTO_TCP) {
1266 if ((error = kernel_listen(sock, 64)) < 0)
1267 goto bummer;
1268 }
1269
1270 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
1271 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1272 return (struct svc_xprt *)svsk;
1273 }
1274
1275 bummer:
1276 dprintk("svc: svc_create_socket error = %d\n", -error);
1277 sock_release(sock);
1278 return ERR_PTR(error);
1279 }
1280
1281 /*
1282 * Detach the svc_sock from the socket so that no
1283 * more callbacks occur.
1284 */
1285 static void svc_sock_detach(struct svc_xprt *xprt)
1286 {
1287 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1288 struct sock *sk = svsk->sk_sk;
1289
1290 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1291
1292 /* put back the old socket callbacks */
1293 sk->sk_state_change = svsk->sk_ostate;
1294 sk->sk_data_ready = svsk->sk_odata;
1295 sk->sk_write_space = svsk->sk_owspace;
1296
1297 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1298 wake_up_interruptible(sk->sk_sleep);
1299 }
1300
1301 /*
1302 * Disconnect the socket, and reset the callbacks
1303 */
1304 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1305 {
1306 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1307
1308 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1309
1310 svc_sock_detach(xprt);
1311
1312 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
1313 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1314 }
1315
1316 /*
1317 * Free the svc_sock's socket resources and the svc_sock itself.
1318 */
1319 static void svc_sock_free(struct svc_xprt *xprt)
1320 {
1321 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1322 dprintk("svc: svc_sock_free(%p)\n", svsk);
1323
1324 if (svsk->sk_sock->file)
1325 sockfd_put(svsk->sk_sock);
1326 else
1327 sock_release(svsk->sk_sock);
1328 kfree(svsk);
1329 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree