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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / net / sunrpc / svcsock.c
blob2fa4ff43b3a7cc7097da1d49d12632ef36bd9c86
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 #include <linux/sunrpc/xprt.h>
53
54 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
55
56
57 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
58 int *errp, int flags);
59 static void svc_udp_data_ready(struct sock *, int);
60 static int svc_udp_recvfrom(struct svc_rqst *);
61 static int svc_udp_sendto(struct svc_rqst *);
62 static void svc_sock_detach(struct svc_xprt *);
63 static void svc_tcp_sock_detach(struct svc_xprt *);
64 static void svc_sock_free(struct svc_xprt *);
65
66 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
67 struct sockaddr *, int, int);
68 #ifdef CONFIG_DEBUG_LOCK_ALLOC
69 static struct lock_class_key svc_key[2];
70 static struct lock_class_key svc_slock_key[2];
71
72 static void svc_reclassify_socket(struct socket *sock)
73 {
74 struct sock *sk = sock->sk;
75 BUG_ON(sock_owned_by_user(sk));
76 switch (sk->sk_family) {
77 case AF_INET:
78 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
79 &svc_slock_key[0],
80 "sk_xprt.xpt_lock-AF_INET-NFSD",
81 &svc_key[0]);
82 break;
83
84 case AF_INET6:
85 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
86 &svc_slock_key[1],
87 "sk_xprt.xpt_lock-AF_INET6-NFSD",
88 &svc_key[1]);
89 break;
90
91 default:
92 BUG();
93 }
94 }
95 #else
96 static void svc_reclassify_socket(struct socket *sock)
97 {
98 }
99 #endif
100
101 /*
102 * Release an skbuff after use
103 */
104 static void svc_release_skb(struct svc_rqst *rqstp)
105 {
106 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
107
108 if (skb) {
109 struct svc_sock *svsk =
110 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
111 rqstp->rq_xprt_ctxt = NULL;
112
113 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
114 skb_free_datagram_locked(svsk->sk_sk, skb);
115 }
116 }
117
118 union svc_pktinfo_u {
119 struct in_pktinfo pkti;
120 struct in6_pktinfo pkti6;
121 };
122 #define SVC_PKTINFO_SPACE \
123 CMSG_SPACE(sizeof(union svc_pktinfo_u))
124
125 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
126 {
127 struct svc_sock *svsk =
128 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
129 switch (svsk->sk_sk->sk_family) {
130 case AF_INET: {
131 struct in_pktinfo *pki = CMSG_DATA(cmh);
132
133 cmh->cmsg_level = SOL_IP;
134 cmh->cmsg_type = IP_PKTINFO;
135 pki->ipi_ifindex = 0;
136 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
137 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
138 }
139 break;
140
141 case AF_INET6: {
142 struct in6_pktinfo *pki = CMSG_DATA(cmh);
143
144 cmh->cmsg_level = SOL_IPV6;
145 cmh->cmsg_type = IPV6_PKTINFO;
146 pki->ipi6_ifindex = 0;
147 ipv6_addr_copy(&pki->ipi6_addr,
148 &rqstp->rq_daddr.addr6);
149 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
150 }
151 break;
152 }
153 }
154
155 /*
156 * send routine intended to be shared by the fore- and back-channel
157 */
158 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
159 struct page *headpage, unsigned long headoffset,
160 struct page *tailpage, unsigned long tailoffset)
161 {
162 int result;
163 int size;
164 struct page **ppage = xdr->pages;
165 size_t base = xdr->page_base;
166 unsigned int pglen = xdr->page_len;
167 unsigned int flags = MSG_MORE;
168 int slen;
169 int len = 0;
170
171 slen = xdr->len;
172
173 /* send head */
174 if (slen == xdr->head[0].iov_len)
175 flags = 0;
176 len = kernel_sendpage(sock, headpage, headoffset,
177 xdr->head[0].iov_len, flags);
178 if (len != xdr->head[0].iov_len)
179 goto out;
180 slen -= xdr->head[0].iov_len;
181 if (slen == 0)
182 goto out;
183
184 /* send page data */
185 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
186 while (pglen > 0) {
187 if (slen == size)
188 flags = 0;
189 result = kernel_sendpage(sock, *ppage, base, size, flags);
190 if (result > 0)
191 len += result;
192 if (result != size)
193 goto out;
194 slen -= size;
195 pglen -= size;
196 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
197 base = 0;
198 ppage++;
199 }
200
201 /* send tail */
202 if (xdr->tail[0].iov_len) {
203 result = kernel_sendpage(sock, tailpage, tailoffset,
204 xdr->tail[0].iov_len, 0);
205 if (result > 0)
206 len += result;
207 }
208
209 out:
210 return len;
211 }
212
213
214 /*
215 * Generic sendto routine
216 */
217 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
218 {
219 struct svc_sock *svsk =
220 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
221 struct socket *sock = svsk->sk_sock;
222 union {
223 struct cmsghdr hdr;
224 long all[SVC_PKTINFO_SPACE / sizeof(long)];
225 } buffer;
226 struct cmsghdr *cmh = &buffer.hdr;
227 int len = 0;
228 unsigned long tailoff;
229 unsigned long headoff;
230 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
231
232 if (rqstp->rq_prot == IPPROTO_UDP) {
233 struct msghdr msg = {
234 .msg_name = &rqstp->rq_addr,
235 .msg_namelen = rqstp->rq_addrlen,
236 .msg_control = cmh,
237 .msg_controllen = sizeof(buffer),
238 .msg_flags = MSG_MORE,
239 };
240
241 svc_set_cmsg_data(rqstp, cmh);
242
243 if (sock_sendmsg(sock, &msg, 0) < 0)
244 goto out;
245 }
246
247 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
248 headoff = 0;
249 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
250 rqstp->rq_respages[0], tailoff);
251
252 out:
253 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
254 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
255 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
256
257 return len;
258 }
259
260 /*
261 * Report socket names for nfsdfs
262 */
263 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
264 {
265 const struct sock *sk = svsk->sk_sk;
266 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
267 "udp" : "tcp";
268 int len;
269
270 switch (sk->sk_family) {
271 case PF_INET:
272 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
273 proto_name,
274 &inet_sk(sk)->inet_rcv_saddr,
275 inet_sk(sk)->inet_num);
276 break;
277 case PF_INET6:
278 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
279 proto_name,
280 &inet6_sk(sk)->rcv_saddr,
281 inet_sk(sk)->inet_num);
282 break;
283 default:
284 len = snprintf(buf, remaining, "*unknown-%d*\n",
285 sk->sk_family);
286 }
287
288 if (len >= remaining) {
289 *buf = '\0';
290 return -ENAMETOOLONG;
291 }
292 return len;
293 }
294
295 /**
296 * svc_sock_names - construct a list of listener names in a string
297 * @serv: pointer to RPC service
298 * @buf: pointer to a buffer to fill in with socket names
299 * @buflen: size of the buffer to be filled
300 * @toclose: pointer to '\0'-terminated C string containing the name
301 * of a listener to be closed
302 *
303 * Fills in @buf with a '\n'-separated list of names of listener
304 * sockets. If @toclose is not NULL, the socket named by @toclose
305 * is closed, and is not included in the output list.
306 *
307 * Returns positive length of the socket name string, or a negative
308 * errno value on error.
309 */
310 int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
311 const char *toclose)
312 {
313 struct svc_sock *svsk, *closesk = NULL;
314 int len = 0;
315
316 if (!serv)
317 return 0;
318
319 spin_lock_bh(&serv->sv_lock);
320 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
321 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
322 if (onelen < 0) {
323 len = onelen;
324 break;
325 }
326 if (toclose && strcmp(toclose, buf + len) == 0)
327 closesk = svsk;
328 else
329 len += onelen;
330 }
331 spin_unlock_bh(&serv->sv_lock);
332
333 if (closesk)
334 /* Should unregister with portmap, but you cannot
335 * unregister just one protocol...
336 */
337 svc_close_xprt(&closesk->sk_xprt);
338 else if (toclose)
339 return -ENOENT;
340 return len;
341 }
342 EXPORT_SYMBOL_GPL(svc_sock_names);
343
344 /*
345 * Check input queue length
346 */
347 static int svc_recv_available(struct svc_sock *svsk)
348 {
349 struct socket *sock = svsk->sk_sock;
350 int avail, err;
351
352 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
353
354 return (err >= 0)? avail : err;
355 }
356
357 /*
358 * Generic recvfrom routine.
359 */
360 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
361 int buflen)
362 {
363 struct svc_sock *svsk =
364 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
365 struct msghdr msg = {
366 .msg_flags = MSG_DONTWAIT,
367 };
368 int len;
369
370 rqstp->rq_xprt_hlen = 0;
371
372 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
373 msg.msg_flags);
374
375 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
376 svsk, iov[0].iov_base, iov[0].iov_len, len);
377 return len;
378 }
379
380 /*
381 * Set socket snd and rcv buffer lengths
382 */
383 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
384 unsigned int rcv)
385 {
386 /* sock_setsockopt limits use to sysctl_?mem_max,
387 * which isn't acceptable. Until that is made conditional
388 * on not having CAP_SYS_RESOURCE or similar, we go direct...
389 * DaveM said I could!
390 */
391 lock_sock(sock->sk);
392 sock->sk->sk_sndbuf = snd * 2;
393 sock->sk->sk_rcvbuf = rcv * 2;
394 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
395 sock->sk->sk_write_space(sock->sk);
396 release_sock(sock->sk);
397 }
398 /*
399 * INET callback when data has been received on the socket.
400 */
401 static void svc_udp_data_ready(struct sock *sk, int count)
402 {
403 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
404
405 if (svsk) {
406 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
407 svsk, sk, count,
408 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
409 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
410 svc_xprt_enqueue(&svsk->sk_xprt);
411 }
412 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
413 wake_up_interruptible(sk_sleep(sk));
414 }
415
416 /*
417 * INET callback when space is newly available on the socket.
418 */
419 static void svc_write_space(struct sock *sk)
420 {
421 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
422
423 if (svsk) {
424 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
425 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
426 svc_xprt_enqueue(&svsk->sk_xprt);
427 }
428
429 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) {
430 dprintk("RPC svc_write_space: someone sleeping on %p\n",
431 svsk);
432 wake_up_interruptible(sk_sleep(sk));
433 }
434 }
435
436 static void svc_tcp_write_space(struct sock *sk)
437 {
438 struct socket *sock = sk->sk_socket;
439
440 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
441 clear_bit(SOCK_NOSPACE, &sock->flags);
442 svc_write_space(sk);
443 }
444
445 /*
446 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
447 */
448 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
449 struct cmsghdr *cmh)
450 {
451 struct in_pktinfo *pki = CMSG_DATA(cmh);
452 if (cmh->cmsg_type != IP_PKTINFO)
453 return 0;
454 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
455 return 1;
456 }
457
458 /*
459 * See net/ipv6/datagram.c : datagram_recv_ctl
460 */
461 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
462 struct cmsghdr *cmh)
463 {
464 struct in6_pktinfo *pki = CMSG_DATA(cmh);
465 if (cmh->cmsg_type != IPV6_PKTINFO)
466 return 0;
467 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
468 return 1;
469 }
470
471 /*
472 * Copy the UDP datagram's destination address to the rqstp structure.
473 * The 'destination' address in this case is the address to which the
474 * peer sent the datagram, i.e. our local address. For multihomed
475 * hosts, this can change from msg to msg. Note that only the IP
476 * address changes, the port number should remain the same.
477 */
478 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
479 struct cmsghdr *cmh)
480 {
481 switch (cmh->cmsg_level) {
482 case SOL_IP:
483 return svc_udp_get_dest_address4(rqstp, cmh);
484 case SOL_IPV6:
485 return svc_udp_get_dest_address6(rqstp, cmh);
486 }
487
488 return 0;
489 }
490
491 /*
492 * Receive a datagram from a UDP socket.
493 */
494 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
495 {
496 struct svc_sock *svsk =
497 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
498 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
499 struct sk_buff *skb;
500 union {
501 struct cmsghdr hdr;
502 long all[SVC_PKTINFO_SPACE / sizeof(long)];
503 } buffer;
504 struct cmsghdr *cmh = &buffer.hdr;
505 struct msghdr msg = {
506 .msg_name = svc_addr(rqstp),
507 .msg_control = cmh,
508 .msg_controllen = sizeof(buffer),
509 .msg_flags = MSG_DONTWAIT,
510 };
511 size_t len;
512 int err;
513
514 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
515 /* udp sockets need large rcvbuf as all pending
516 * requests are still in that buffer. sndbuf must
517 * also be large enough that there is enough space
518 * for one reply per thread. We count all threads
519 * rather than threads in a particular pool, which
520 * provides an upper bound on the number of threads
521 * which will access the socket.
522 */
523 svc_sock_setbufsize(svsk->sk_sock,
524 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
525 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
526
527 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
528 skb = NULL;
529 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
530 0, 0, MSG_PEEK | MSG_DONTWAIT);
531 if (err >= 0)
532 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
533
534 if (skb == NULL) {
535 if (err != -EAGAIN) {
536 /* possibly an icmp error */
537 dprintk("svc: recvfrom returned error %d\n", -err);
538 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
539 }
540 return -EAGAIN;
541 }
542 len = svc_addr_len(svc_addr(rqstp));
543 if (len == 0)
544 return -EAFNOSUPPORT;
545 rqstp->rq_addrlen = len;
546 if (skb->tstamp.tv64 == 0) {
547 skb->tstamp = ktime_get_real();
548 /* Don't enable netstamp, sunrpc doesn't
549 need that much accuracy */
550 }
551 svsk->sk_sk->sk_stamp = skb->tstamp;
552 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
553
554 len = skb->len - sizeof(struct udphdr);
555 rqstp->rq_arg.len = len;
556
557 rqstp->rq_prot = IPPROTO_UDP;
558
559 if (!svc_udp_get_dest_address(rqstp, cmh)) {
560 if (net_ratelimit())
561 printk(KERN_WARNING
562 "svc: received unknown control message %d/%d; "
563 "dropping RPC reply datagram\n",
564 cmh->cmsg_level, cmh->cmsg_type);
565 skb_free_datagram_locked(svsk->sk_sk, skb);
566 return 0;
567 }
568
569 if (skb_is_nonlinear(skb)) {
570 /* we have to copy */
571 local_bh_disable();
572 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
573 local_bh_enable();
574 /* checksum error */
575 skb_free_datagram_locked(svsk->sk_sk, skb);
576 return 0;
577 }
578 local_bh_enable();
579 skb_free_datagram_locked(svsk->sk_sk, skb);
580 } else {
581 /* we can use it in-place */
582 rqstp->rq_arg.head[0].iov_base = skb->data +
583 sizeof(struct udphdr);
584 rqstp->rq_arg.head[0].iov_len = len;
585 if (skb_checksum_complete(skb)) {
586 skb_free_datagram_locked(svsk->sk_sk, skb);
587 return 0;
588 }
589 rqstp->rq_xprt_ctxt = skb;
590 }
591
592 rqstp->rq_arg.page_base = 0;
593 if (len <= rqstp->rq_arg.head[0].iov_len) {
594 rqstp->rq_arg.head[0].iov_len = len;
595 rqstp->rq_arg.page_len = 0;
596 rqstp->rq_respages = rqstp->rq_pages+1;
597 } else {
598 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
599 rqstp->rq_respages = rqstp->rq_pages + 1 +
600 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
601 }
602
603 if (serv->sv_stats)
604 serv->sv_stats->netudpcnt++;
605
606 return len;
607 }
608
609 static int
610 svc_udp_sendto(struct svc_rqst *rqstp)
611 {
612 int error;
613
614 error = svc_sendto(rqstp, &rqstp->rq_res);
615 if (error == -ECONNREFUSED)
616 /* ICMP error on earlier request. */
617 error = svc_sendto(rqstp, &rqstp->rq_res);
618
619 return error;
620 }
621
622 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
623 {
624 }
625
626 static int svc_udp_has_wspace(struct svc_xprt *xprt)
627 {
628 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
629 struct svc_serv *serv = xprt->xpt_server;
630 unsigned long required;
631
632 /*
633 * Set the SOCK_NOSPACE flag before checking the available
634 * sock space.
635 */
636 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
637 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
638 if (required*2 > sock_wspace(svsk->sk_sk))
639 return 0;
640 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
641 return 1;
642 }
643
644 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
645 {
646 BUG();
647 return NULL;
648 }
649
650 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
651 struct sockaddr *sa, int salen,
652 int flags)
653 {
654 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
655 }
656
657 static struct svc_xprt_ops svc_udp_ops = {
658 .xpo_create = svc_udp_create,
659 .xpo_recvfrom = svc_udp_recvfrom,
660 .xpo_sendto = svc_udp_sendto,
661 .xpo_release_rqst = svc_release_skb,
662 .xpo_detach = svc_sock_detach,
663 .xpo_free = svc_sock_free,
664 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
665 .xpo_has_wspace = svc_udp_has_wspace,
666 .xpo_accept = svc_udp_accept,
667 };
668
669 static struct svc_xprt_class svc_udp_class = {
670 .xcl_name = "udp",
671 .xcl_owner = THIS_MODULE,
672 .xcl_ops = &svc_udp_ops,
673 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
674 };
675
676 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
677 {
678 int err, level, optname, one = 1;
679
680 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
681 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
682 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
683 svsk->sk_sk->sk_write_space = svc_write_space;
684
685 /* initialise setting must have enough space to
686 * receive and respond to one request.
687 * svc_udp_recvfrom will re-adjust if necessary
688 */
689 svc_sock_setbufsize(svsk->sk_sock,
690 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
691 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
692
693 /* data might have come in before data_ready set up */
694 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
695 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
696
697 /* make sure we get destination address info */
698 switch (svsk->sk_sk->sk_family) {
699 case AF_INET:
700 level = SOL_IP;
701 optname = IP_PKTINFO;
702 break;
703 case AF_INET6:
704 level = SOL_IPV6;
705 optname = IPV6_RECVPKTINFO;
706 break;
707 default:
708 BUG();
709 }
710 err = kernel_setsockopt(svsk->sk_sock, level, optname,
711 (char *)&one, sizeof(one));
712 dprintk("svc: kernel_setsockopt returned %d\n", err);
713 }
714
715 /*
716 * A data_ready event on a listening socket means there's a connection
717 * pending. Do not use state_change as a substitute for it.
718 */
719 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
720 {
721 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
722
723 dprintk("svc: socket %p TCP (listen) state change %d\n",
724 sk, sk->sk_state);
725
726 /*
727 * This callback may called twice when a new connection
728 * is established as a child socket inherits everything
729 * from a parent LISTEN socket.
730 * 1) data_ready method of the parent socket will be called
731 * when one of child sockets become ESTABLISHED.
732 * 2) data_ready method of the child socket may be called
733 * when it receives data before the socket is accepted.
734 * In case of 2, we should ignore it silently.
735 */
736 if (sk->sk_state == TCP_LISTEN) {
737 if (svsk) {
738 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
739 svc_xprt_enqueue(&svsk->sk_xprt);
740 } else
741 printk("svc: socket %p: no user data\n", sk);
742 }
743
744 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
745 wake_up_interruptible_all(sk_sleep(sk));
746 }
747
748 /*
749 * A state change on a connected socket means it's dying or dead.
750 */
751 static void svc_tcp_state_change(struct sock *sk)
752 {
753 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
754
755 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
756 sk, sk->sk_state, sk->sk_user_data);
757
758 if (!svsk)
759 printk("svc: socket %p: no user data\n", sk);
760 else {
761 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
762 svc_xprt_enqueue(&svsk->sk_xprt);
763 }
764 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
765 wake_up_interruptible_all(sk_sleep(sk));
766 }
767
768 static void svc_tcp_data_ready(struct sock *sk, int count)
769 {
770 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
771
772 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
773 sk, sk->sk_user_data);
774 if (svsk) {
775 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
776 svc_xprt_enqueue(&svsk->sk_xprt);
777 }
778 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
779 wake_up_interruptible(sk_sleep(sk));
780 }
781
782 /*
783 * Accept a TCP connection
784 */
785 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
786 {
787 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
788 struct sockaddr_storage addr;
789 struct sockaddr *sin = (struct sockaddr *) &addr;
790 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
791 struct socket *sock = svsk->sk_sock;
792 struct socket *newsock;
793 struct svc_sock *newsvsk;
794 int err, slen;
795 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
796
797 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
798 if (!sock)
799 return NULL;
800
801 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
802 err = kernel_accept(sock, &newsock, O_NONBLOCK);
803 if (err < 0) {
804 if (err == -ENOMEM)
805 printk(KERN_WARNING "%s: no more sockets!\n",
806 serv->sv_name);
807 else if (err != -EAGAIN && net_ratelimit())
808 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
809 serv->sv_name, -err);
810 return NULL;
811 }
812 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
813
814 err = kernel_getpeername(newsock, sin, &slen);
815 if (err < 0) {
816 if (net_ratelimit())
817 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
818 serv->sv_name, -err);
819 goto failed; /* aborted connection or whatever */
820 }
821
822 /* Ideally, we would want to reject connections from unauthorized
823 * hosts here, but when we get encryption, the IP of the host won't
824 * tell us anything. For now just warn about unpriv connections.
825 */
826 if (!svc_port_is_privileged(sin)) {
827 dprintk(KERN_WARNING
828 "%s: connect from unprivileged port: %s\n",
829 serv->sv_name,
830 __svc_print_addr(sin, buf, sizeof(buf)));
831 }
832 dprintk("%s: connect from %s\n", serv->sv_name,
833 __svc_print_addr(sin, buf, sizeof(buf)));
834
835 /* make sure that a write doesn't block forever when
836 * low on memory
837 */
838 newsock->sk->sk_sndtimeo = HZ*30;
839
840 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
841 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
842 goto failed;
843 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
844 err = kernel_getsockname(newsock, sin, &slen);
845 if (unlikely(err < 0)) {
846 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
847 slen = offsetof(struct sockaddr, sa_data);
848 }
849 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
850
851 if (serv->sv_stats)
852 serv->sv_stats->nettcpconn++;
853
854 return &newsvsk->sk_xprt;
855
856 failed:
857 sock_release(newsock);
858 return NULL;
859 }
860
861 /*
862 * Receive data.
863 * If we haven't gotten the record length yet, get the next four bytes.
864 * Otherwise try to gobble up as much as possible up to the complete
865 * record length.
866 */
867 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
868 {
869 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
870 int len;
871
872 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
873 /* sndbuf needs to have room for one request
874 * per thread, otherwise we can stall even when the
875 * network isn't a bottleneck.
876 *
877 * We count all threads rather than threads in a
878 * particular pool, which provides an upper bound
879 * on the number of threads which will access the socket.
880 *
881 * rcvbuf just needs to be able to hold a few requests.
882 * Normally they will be removed from the queue
883 * as soon a a complete request arrives.
884 */
885 svc_sock_setbufsize(svsk->sk_sock,
886 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
887 3 * serv->sv_max_mesg);
888
889 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
890
891 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
892 int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
893 struct kvec iov;
894
895 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
896 iov.iov_len = want;
897 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
898 goto error;
899 svsk->sk_tcplen += len;
900
901 if (len < want) {
902 dprintk("svc: short recvfrom while reading record "
903 "length (%d of %d)\n", len, want);
904 goto err_again; /* record header not complete */
905 }
906
907 svsk->sk_reclen = ntohl(svsk->sk_reclen);
908 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
909 if (net_ratelimit())
910 printk(KERN_NOTICE "RPC: multiple fragments "
911 "per record not supported\n");
912 goto err_delete;
913 }
914
915 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
916 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
917 if (svsk->sk_reclen > serv->sv_max_mesg) {
918 if (net_ratelimit())
919 printk(KERN_NOTICE "RPC: "
920 "fragment too large: 0x%08lx\n",
921 (unsigned long)svsk->sk_reclen);
922 goto err_delete;
923 }
924 }
925
926 /* Check whether enough data is available */
927 len = svc_recv_available(svsk);
928 if (len < 0)
929 goto error;
930
931 if (len < svsk->sk_reclen) {
932 dprintk("svc: incomplete TCP record (%d of %d)\n",
933 len, svsk->sk_reclen);
934 goto err_again; /* record not complete */
935 }
936 len = svsk->sk_reclen;
937 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
938
939 return len;
940 error:
941 if (len == -EAGAIN)
942 dprintk("RPC: TCP recv_record got EAGAIN\n");
943 return len;
944 err_delete:
945 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
946 err_again:
947 return -EAGAIN;
948 }
949
950 static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
951 struct rpc_rqst **reqpp, struct kvec *vec)
952 {
953 struct rpc_rqst *req = NULL;
954 u32 *p;
955 u32 xid;
956 u32 calldir;
957 int len;
958
959 len = svc_recvfrom(rqstp, vec, 1, 8);
960 if (len < 0)
961 goto error;
962
963 p = (u32 *)rqstp->rq_arg.head[0].iov_base;
964 xid = *p++;
965 calldir = *p;
966
967 if (calldir == 0) {
968 /* REQUEST is the most common case */
969 vec[0] = rqstp->rq_arg.head[0];
970 } else {
971 /* REPLY */
972 if (svsk->sk_bc_xprt)
973 req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
974
975 if (!req) {
976 printk(KERN_NOTICE
977 "%s: Got unrecognized reply: "
978 "calldir 0x%x sk_bc_xprt %p xid %08x\n",
979 __func__, ntohl(calldir),
980 svsk->sk_bc_xprt, xid);
981 vec[0] = rqstp->rq_arg.head[0];
982 goto out;
983 }
984
985 memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
986 sizeof(struct xdr_buf));
987 /* copy the xid and call direction */
988 memcpy(req->rq_private_buf.head[0].iov_base,
989 rqstp->rq_arg.head[0].iov_base, 8);
990 vec[0] = req->rq_private_buf.head[0];
991 }
992 out:
993 vec[0].iov_base += 8;
994 vec[0].iov_len -= 8;
995 len = svsk->sk_reclen - 8;
996 error:
997 *reqpp = req;
998 return len;
999 }
1000
1001 /*
1002 * Receive data from a TCP socket.
1003 */
1004 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1005 {
1006 struct svc_sock *svsk =
1007 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1008 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1009 int len;
1010 struct kvec *vec;
1011 int pnum, vlen;
1012 struct rpc_rqst *req = NULL;
1013
1014 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1015 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1016 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1017 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1018
1019 len = svc_tcp_recv_record(svsk, rqstp);
1020 if (len < 0)
1021 goto error;
1022
1023 vec = rqstp->rq_vec;
1024 vec[0] = rqstp->rq_arg.head[0];
1025 vlen = PAGE_SIZE;
1026
1027 /*
1028 * We have enough data for the whole tcp record. Let's try and read the
1029 * first 8 bytes to get the xid and the call direction. We can use this
1030 * to figure out if this is a call or a reply to a callback. If
1031 * sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
1032 * In that case, don't bother with the calldir and just read the data.
1033 * It will be rejected in svc_process.
1034 */
1035 if (len >= 8) {
1036 len = svc_process_calldir(svsk, rqstp, &req, vec);
1037 if (len < 0)
1038 goto err_again;
1039 vlen -= 8;
1040 }
1041
1042 pnum = 1;
1043 while (vlen < len) {
1044 vec[pnum].iov_base = (req) ?
1045 page_address(req->rq_private_buf.pages[pnum - 1]) :
1046 page_address(rqstp->rq_pages[pnum]);
1047 vec[pnum].iov_len = PAGE_SIZE;
1048 pnum++;
1049 vlen += PAGE_SIZE;
1050 }
1051 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1052
1053 /* Now receive data */
1054 len = svc_recvfrom(rqstp, vec, pnum, len);
1055 if (len < 0)
1056 goto err_again;
1057
1058 /*
1059 * Account for the 8 bytes we read earlier
1060 */
1061 len += 8;
1062
1063 if (req) {
1064 xprt_complete_rqst(req->rq_task, len);
1065 len = 0;
1066 goto out;
1067 }
1068 dprintk("svc: TCP complete record (%d bytes)\n", len);
1069 rqstp->rq_arg.len = len;
1070 rqstp->rq_arg.page_base = 0;
1071 if (len <= rqstp->rq_arg.head[0].iov_len) {
1072 rqstp->rq_arg.head[0].iov_len = len;
1073 rqstp->rq_arg.page_len = 0;
1074 } else {
1075 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
1076 }
1077
1078 rqstp->rq_xprt_ctxt = NULL;
1079 rqstp->rq_prot = IPPROTO_TCP;
1080
1081 out:
1082 /* Reset TCP read info */
1083 svsk->sk_reclen = 0;
1084 svsk->sk_tcplen = 0;
1085
1086 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1087 if (serv->sv_stats)
1088 serv->sv_stats->nettcpcnt++;
1089
1090 return len;
1091
1092 err_again:
1093 if (len == -EAGAIN) {
1094 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1095 return len;
1096 }
1097 error:
1098 if (len != -EAGAIN) {
1099 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1100 svsk->sk_xprt.xpt_server->sv_name, -len);
1101 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1102 }
1103 return -EAGAIN;
1104 }
1105
1106 /*
1107 * Send out data on TCP socket.
1108 */
1109 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1110 {
1111 struct xdr_buf *xbufp = &rqstp->rq_res;
1112 int sent;
1113 __be32 reclen;
1114
1115 /* Set up the first element of the reply kvec.
1116 * Any other kvecs that may be in use have been taken
1117 * care of by the server implementation itself.
1118 */
1119 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1120 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1121
1122 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
1123 return -ENOTCONN;
1124
1125 sent = svc_sendto(rqstp, &rqstp->rq_res);
1126 if (sent != xbufp->len) {
1127 printk(KERN_NOTICE
1128 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1129 "- shutting down socket\n",
1130 rqstp->rq_xprt->xpt_server->sv_name,
1131 (sent<0)?"got error":"sent only",
1132 sent, xbufp->len);
1133 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1134 svc_xprt_enqueue(rqstp->rq_xprt);
1135 sent = -EAGAIN;
1136 }
1137 return sent;
1138 }
1139
1140 /*
1141 * Setup response header. TCP has a 4B record length field.
1142 */
1143 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1144 {
1145 struct kvec *resv = &rqstp->rq_res.head[0];
1146
1147 /* tcp needs a space for the record length... */
1148 svc_putnl(resv, 0);
1149 }
1150
1151 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1152 {
1153 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1154 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1155 int required;
1156
1157 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1158 return 1;
1159 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1160 if (sk_stream_wspace(svsk->sk_sk) >= required)
1161 return 1;
1162 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1163 return 0;
1164 }
1165
1166 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1167 struct sockaddr *sa, int salen,
1168 int flags)
1169 {
1170 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1171 }
1172
1173 static struct svc_xprt_ops svc_tcp_ops = {
1174 .xpo_create = svc_tcp_create,
1175 .xpo_recvfrom = svc_tcp_recvfrom,
1176 .xpo_sendto = svc_tcp_sendto,
1177 .xpo_release_rqst = svc_release_skb,
1178 .xpo_detach = svc_tcp_sock_detach,
1179 .xpo_free = svc_sock_free,
1180 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1181 .xpo_has_wspace = svc_tcp_has_wspace,
1182 .xpo_accept = svc_tcp_accept,
1183 };
1184
1185 static struct svc_xprt_class svc_tcp_class = {
1186 .xcl_name = "tcp",
1187 .xcl_owner = THIS_MODULE,
1188 .xcl_ops = &svc_tcp_ops,
1189 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1190 };
1191
1192 void svc_init_xprt_sock(void)
1193 {
1194 svc_reg_xprt_class(&svc_tcp_class);
1195 svc_reg_xprt_class(&svc_udp_class);
1196 }
1197
1198 void svc_cleanup_xprt_sock(void)
1199 {
1200 svc_unreg_xprt_class(&svc_tcp_class);
1201 svc_unreg_xprt_class(&svc_udp_class);
1202 }
1203
1204 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1205 {
1206 struct sock *sk = svsk->sk_sk;
1207
1208 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
1209 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1210 if (sk->sk_state == TCP_LISTEN) {
1211 dprintk("setting up TCP socket for listening\n");
1212 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1213 sk->sk_data_ready = svc_tcp_listen_data_ready;
1214 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1215 } else {
1216 dprintk("setting up TCP socket for reading\n");
1217 sk->sk_state_change = svc_tcp_state_change;
1218 sk->sk_data_ready = svc_tcp_data_ready;
1219 sk->sk_write_space = svc_tcp_write_space;
1220
1221 svsk->sk_reclen = 0;
1222 svsk->sk_tcplen = 0;
1223
1224 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1225
1226 /* initialise setting must have enough space to
1227 * receive and respond to one request.
1228 * svc_tcp_recvfrom will re-adjust if necessary
1229 */
1230 svc_sock_setbufsize(svsk->sk_sock,
1231 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1232 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1233
1234 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1235 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1236 if (sk->sk_state != TCP_ESTABLISHED)
1237 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1238 }
1239 }
1240
1241 void svc_sock_update_bufs(struct svc_serv *serv)
1242 {
1243 /*
1244 * The number of server threads has changed. Update
1245 * rcvbuf and sndbuf accordingly on all sockets
1246 */
1247 struct list_head *le;
1248
1249 spin_lock_bh(&serv->sv_lock);
1250 list_for_each(le, &serv->sv_permsocks) {
1251 struct svc_sock *svsk =
1252 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1253 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1254 }
1255 list_for_each(le, &serv->sv_tempsocks) {
1256 struct svc_sock *svsk =
1257 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1258 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1259 }
1260 spin_unlock_bh(&serv->sv_lock);
1261 }
1262 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1263
1264 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1265 struct socket *sock,
1266 int *errp, int flags)
1267 {
1268 struct svc_sock *svsk;
1269 struct sock *inet;
1270 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1271
1272 dprintk("svc: svc_setup_socket %p\n", sock);
1273 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
1274 *errp = -ENOMEM;
1275 return NULL;
1276 }
1277
1278 inet = sock->sk;
1279
1280 /* Register socket with portmapper */
1281 if (*errp >= 0 && pmap_register)
1282 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
1283 ntohs(inet_sk(inet)->inet_sport));
1284
1285 if (*errp < 0) {
1286 kfree(svsk);
1287 return NULL;
1288 }
1289
1290 inet->sk_user_data = svsk;
1291 svsk->sk_sock = sock;
1292 svsk->sk_sk = inet;
1293 svsk->sk_ostate = inet->sk_state_change;
1294 svsk->sk_odata = inet->sk_data_ready;
1295 svsk->sk_owspace = inet->sk_write_space;
1296
1297 /* Initialize the socket */
1298 if (sock->type == SOCK_DGRAM)
1299 svc_udp_init(svsk, serv);
1300 else
1301 svc_tcp_init(svsk, serv);
1302
1303 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1304 svsk, svsk->sk_sk);
1305
1306 return svsk;
1307 }
1308
1309 /**
1310 * svc_addsock - add a listener socket to an RPC service
1311 * @serv: pointer to RPC service to which to add a new listener
1312 * @fd: file descriptor of the new listener
1313 * @name_return: pointer to buffer to fill in with name of listener
1314 * @len: size of the buffer
1315 *
1316 * Fills in socket name and returns positive length of name if successful.
1317 * Name is terminated with '\n'. On error, returns a negative errno
1318 * value.
1319 */
1320 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1321 const size_t len)
1322 {
1323 int err = 0;
1324 struct socket *so = sockfd_lookup(fd, &err);
1325 struct svc_sock *svsk = NULL;
1326
1327 if (!so)
1328 return err;
1329 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1330 err = -EAFNOSUPPORT;
1331 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1332 so->sk->sk_protocol != IPPROTO_UDP)
1333 err = -EPROTONOSUPPORT;
1334 else if (so->state > SS_UNCONNECTED)
1335 err = -EISCONN;
1336 else {
1337 if (!try_module_get(THIS_MODULE))
1338 err = -ENOENT;
1339 else
1340 svsk = svc_setup_socket(serv, so, &err,
1341 SVC_SOCK_DEFAULTS);
1342 if (svsk) {
1343 struct sockaddr_storage addr;
1344 struct sockaddr *sin = (struct sockaddr *)&addr;
1345 int salen;
1346 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1347 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1348 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1349 spin_lock_bh(&serv->sv_lock);
1350 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1351 spin_unlock_bh(&serv->sv_lock);
1352 svc_xprt_received(&svsk->sk_xprt);
1353 err = 0;
1354 } else
1355 module_put(THIS_MODULE);
1356 }
1357 if (err) {
1358 sockfd_put(so);
1359 return err;
1360 }
1361 return svc_one_sock_name(svsk, name_return, len);
1362 }
1363 EXPORT_SYMBOL_GPL(svc_addsock);
1364
1365 /*
1366 * Create socket for RPC service.
1367 */
1368 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1369 int protocol,
1370 struct sockaddr *sin, int len,
1371 int flags)
1372 {
1373 struct svc_sock *svsk;
1374 struct socket *sock;
1375 int error;
1376 int type;
1377 struct sockaddr_storage addr;
1378 struct sockaddr *newsin = (struct sockaddr *)&addr;
1379 int newlen;
1380 int family;
1381 int val;
1382 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1383
1384 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1385 serv->sv_program->pg_name, protocol,
1386 __svc_print_addr(sin, buf, sizeof(buf)));
1387
1388 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1389 printk(KERN_WARNING "svc: only UDP and TCP "
1390 "sockets supported\n");
1391 return ERR_PTR(-EINVAL);
1392 }
1393
1394 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1395 switch (sin->sa_family) {
1396 case AF_INET6:
1397 family = PF_INET6;
1398 break;
1399 case AF_INET:
1400 family = PF_INET;
1401 break;
1402 default:
1403 return ERR_PTR(-EINVAL);
1404 }
1405
1406 error = sock_create_kern(family, type, protocol, &sock);
1407 if (error < 0)
1408 return ERR_PTR(error);
1409
1410 svc_reclassify_socket(sock);
1411
1412 /*
1413 * If this is an PF_INET6 listener, we want to avoid
1414 * getting requests from IPv4 remotes. Those should
1415 * be shunted to a PF_INET listener via rpcbind.
1416 */
1417 val = 1;
1418 if (family == PF_INET6)
1419 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1420 (char *)&val, sizeof(val));
1421
1422 if (type == SOCK_STREAM)
1423 sock->sk->sk_reuse = 1; /* allow address reuse */
1424 error = kernel_bind(sock, sin, len);
1425 if (error < 0)
1426 goto bummer;
1427
1428 newlen = len;
1429 error = kernel_getsockname(sock, newsin, &newlen);
1430 if (error < 0)
1431 goto bummer;
1432
1433 if (protocol == IPPROTO_TCP) {
1434 if ((error = kernel_listen(sock, 64)) < 0)
1435 goto bummer;
1436 }
1437
1438 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
1439 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1440 return (struct svc_xprt *)svsk;
1441 }
1442
1443 bummer:
1444 dprintk("svc: svc_create_socket error = %d\n", -error);
1445 sock_release(sock);
1446 return ERR_PTR(error);
1447 }
1448
1449 /*
1450 * Detach the svc_sock from the socket so that no
1451 * more callbacks occur.
1452 */
1453 static void svc_sock_detach(struct svc_xprt *xprt)
1454 {
1455 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1456 struct sock *sk = svsk->sk_sk;
1457
1458 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1459
1460 /* put back the old socket callbacks */
1461 sk->sk_state_change = svsk->sk_ostate;
1462 sk->sk_data_ready = svsk->sk_odata;
1463 sk->sk_write_space = svsk->sk_owspace;
1464
1465 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
1466 wake_up_interruptible(sk_sleep(sk));
1467 }
1468
1469 /*
1470 * Disconnect the socket, and reset the callbacks
1471 */
1472 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1473 {
1474 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1475
1476 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1477
1478 svc_sock_detach(xprt);
1479
1480 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
1481 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1482 }
1483
1484 /*
1485 * Free the svc_sock's socket resources and the svc_sock itself.
1486 */
1487 static void svc_sock_free(struct svc_xprt *xprt)
1488 {
1489 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1490 dprintk("svc: svc_sock_free(%p)\n", svsk);
1491
1492 if (svsk->sk_sock->file)
1493 sockfd_put(svsk->sk_sock);
1494 else
1495 sock_release(svsk->sk_sock);
1496 kfree(svsk);
1497 }
1498
1499 /*
1500 * Create a svc_xprt.
1501 *
1502 * For internal use only (e.g. nfsv4.1 backchannel).
1503 * Callers should typically use the xpo_create() method.
1504 */
1505 struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
1506 {
1507 struct svc_sock *svsk;
1508 struct svc_xprt *xprt = NULL;
1509
1510 dprintk("svc: %s\n", __func__);
1511 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1512 if (!svsk)
1513 goto out;
1514
1515 xprt = &svsk->sk_xprt;
1516 if (prot == IPPROTO_TCP)
1517 svc_xprt_init(&svc_tcp_class, xprt, serv);
1518 else if (prot == IPPROTO_UDP)
1519 svc_xprt_init(&svc_udp_class, xprt, serv);
1520 else
1521 BUG();
1522 out:
1523 dprintk("svc: %s return %p\n", __func__, xprt);
1524 return xprt;
1525 }
1526 EXPORT_SYMBOL_GPL(svc_sock_create);
1527
1528 /*
1529 * Destroy a svc_sock.
1530 */
1531 void svc_sock_destroy(struct svc_xprt *xprt)
1532 {
1533 if (xprt)
1534 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1535 }
1536 EXPORT_SYMBOL_GPL(svc_sock_destroy);
Tomato firmware and modifications.