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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / net / sunrpc / svcsock.c
blobb6e59f0a9475d665ea1952a8428e56ed6b06b89e
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/module.h>
25 #include <linux/errno.h>
26 #include <linux/fcntl.h>
27 #include <linux/net.h>
28 #include <linux/in.h>
29 #include <linux/inet.h>
30 #include <linux/udp.h>
31 #include <linux/tcp.h>
32 #include <linux/unistd.h>
33 #include <linux/slab.h>
34 #include <linux/netdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/file.h>
37 #include <linux/freezer.h>
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/ip.h>
41 #include <net/ipv6.h>
42 #include <net/tcp.h>
43 #include <net/tcp_states.h>
44 #include <asm/uaccess.h>
45 #include <asm/ioctls.h>
46 #include <trace/events/skb.h>
47
48 #include <linux/sunrpc/types.h>
49 #include <linux/sunrpc/clnt.h>
50 #include <linux/sunrpc/xdr.h>
51 #include <linux/sunrpc/msg_prot.h>
52 #include <linux/sunrpc/svcsock.h>
53 #include <linux/sunrpc/stats.h>
54 #include <linux/sunrpc/xprt.h>
55
56 #include "sunrpc.h"
57
58 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
59
60
61 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
62 int flags);
63 static void svc_udp_data_ready(struct sock *, int);
64 static int svc_udp_recvfrom(struct svc_rqst *);
65 static int svc_udp_sendto(struct svc_rqst *);
66 static void svc_sock_detach(struct svc_xprt *);
67 static void svc_tcp_sock_detach(struct svc_xprt *);
68 static void svc_sock_free(struct svc_xprt *);
69
70 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
71 struct net *, struct sockaddr *,
72 int, int);
73 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
74 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77 static void svc_bc_sock_free(struct svc_xprt *xprt);
78 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
79
80 #ifdef CONFIG_DEBUG_LOCK_ALLOC
81 static struct lock_class_key svc_key[2];
82 static struct lock_class_key svc_slock_key[2];
83
84 static void svc_reclassify_socket(struct socket *sock)
85 {
86 struct sock *sk = sock->sk;
87
88 WARN_ON_ONCE(sock_owned_by_user(sk));
89 if (sock_owned_by_user(sk))
90 return;
91
92 switch (sk->sk_family) {
93 case AF_INET:
94 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
95 &svc_slock_key[0],
96 "sk_xprt.xpt_lock-AF_INET-NFSD",
97 &svc_key[0]);
98 break;
99
100 case AF_INET6:
101 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
102 &svc_slock_key[1],
103 "sk_xprt.xpt_lock-AF_INET6-NFSD",
104 &svc_key[1]);
105 break;
106
107 default:
108 BUG();
109 }
110 }
111 #else
112 static void svc_reclassify_socket(struct socket *sock)
113 {
114 }
115 #endif
116
117 /*
118 * Release an skbuff after use
119 */
120 static void svc_release_skb(struct svc_rqst *rqstp)
121 {
122 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
123
124 if (skb) {
125 struct svc_sock *svsk =
126 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
127 rqstp->rq_xprt_ctxt = NULL;
128
129 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
130 skb_free_datagram_locked(svsk->sk_sk, skb);
131 }
132 }
133
134 union svc_pktinfo_u {
135 struct in_pktinfo pkti;
136 struct in6_pktinfo pkti6;
137 };
138 #define SVC_PKTINFO_SPACE \
139 CMSG_SPACE(sizeof(union svc_pktinfo_u))
140
141 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
142 {
143 struct svc_sock *svsk =
144 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
145 switch (svsk->sk_sk->sk_family) {
146 case AF_INET: {
147 struct in_pktinfo *pki = CMSG_DATA(cmh);
148
149 cmh->cmsg_level = SOL_IP;
150 cmh->cmsg_type = IP_PKTINFO;
151 pki->ipi_ifindex = 0;
152 pki->ipi_spec_dst.s_addr =
153 svc_daddr_in(rqstp)->sin_addr.s_addr;
154 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
155 }
156 break;
157
158 case AF_INET6: {
159 struct in6_pktinfo *pki = CMSG_DATA(cmh);
160 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
161
162 cmh->cmsg_level = SOL_IPV6;
163 cmh->cmsg_type = IPV6_PKTINFO;
164 pki->ipi6_ifindex = daddr->sin6_scope_id;
165 pki->ipi6_addr = daddr->sin6_addr;
166 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
167 }
168 break;
169 }
170 }
171
172 /*
173 * send routine intended to be shared by the fore- and back-channel
174 */
175 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
176 struct page *headpage, unsigned long headoffset,
177 struct page *tailpage, unsigned long tailoffset)
178 {
179 int result;
180 int size;
181 struct page **ppage = xdr->pages;
182 size_t base = xdr->page_base;
183 unsigned int pglen = xdr->page_len;
184 unsigned int flags = MSG_MORE;
185 int slen;
186 int len = 0;
187
188 slen = xdr->len;
189
190 /* send head */
191 if (slen == xdr->head[0].iov_len)
192 flags = 0;
193 len = kernel_sendpage(sock, headpage, headoffset,
194 xdr->head[0].iov_len, flags);
195 if (len != xdr->head[0].iov_len)
196 goto out;
197 slen -= xdr->head[0].iov_len;
198 if (slen == 0)
199 goto out;
200
201 /* send page data */
202 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
203 while (pglen > 0) {
204 if (slen == size)
205 flags = 0;
206 result = kernel_sendpage(sock, *ppage, base, size, flags);
207 if (result > 0)
208 len += result;
209 if (result != size)
210 goto out;
211 slen -= size;
212 pglen -= size;
213 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
214 base = 0;
215 ppage++;
216 }
217
218 /* send tail */
219 if (xdr->tail[0].iov_len) {
220 result = kernel_sendpage(sock, tailpage, tailoffset,
221 xdr->tail[0].iov_len, 0);
222 if (result > 0)
223 len += result;
224 }
225
226 out:
227 return len;
228 }
229
230
231 /*
232 * Generic sendto routine
233 */
234 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
235 {
236 struct svc_sock *svsk =
237 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
238 struct socket *sock = svsk->sk_sock;
239 union {
240 struct cmsghdr hdr;
241 long all[SVC_PKTINFO_SPACE / sizeof(long)];
242 } buffer;
243 struct cmsghdr *cmh = &buffer.hdr;
244 int len = 0;
245 unsigned long tailoff;
246 unsigned long headoff;
247 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
248
249 if (rqstp->rq_prot == IPPROTO_UDP) {
250 struct msghdr msg = {
251 .msg_name = &rqstp->rq_addr,
252 .msg_namelen = rqstp->rq_addrlen,
253 .msg_control = cmh,
254 .msg_controllen = sizeof(buffer),
255 .msg_flags = MSG_MORE,
256 };
257
258 svc_set_cmsg_data(rqstp, cmh);
259
260 if (sock_sendmsg(sock, &msg, 0) < 0)
261 goto out;
262 }
263
264 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
265 headoff = 0;
266 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
267 rqstp->rq_respages[0], tailoff);
268
269 out:
270 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
271 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
272 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
273
274 return len;
275 }
276
277 /*
278 * Report socket names for nfsdfs
279 */
280 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
281 {
282 const struct sock *sk = svsk->sk_sk;
283 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
284 "udp" : "tcp";
285 int len;
286
287 switch (sk->sk_family) {
288 case PF_INET:
289 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
290 proto_name,
291 &inet_sk(sk)->inet_rcv_saddr,
292 inet_sk(sk)->inet_num);
293 break;
294 #if IS_ENABLED(CONFIG_IPV6)
295 case PF_INET6:
296 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
297 proto_name,
298 &sk->sk_v6_rcv_saddr,
299 inet_sk(sk)->inet_num);
300 break;
301 #endif
302 default:
303 len = snprintf(buf, remaining, "*unknown-%d*\n",
304 sk->sk_family);
305 }
306
307 if (len >= remaining) {
308 *buf = '\0';
309 return -ENAMETOOLONG;
310 }
311 return len;
312 }
313
314 /*
315 * Check input queue length
316 */
317 static int svc_recv_available(struct svc_sock *svsk)
318 {
319 struct socket *sock = svsk->sk_sock;
320 int avail, err;
321
322 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
323
324 return (err >= 0)? avail : err;
325 }
326
327 /*
328 * Generic recvfrom routine.
329 */
330 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
331 int buflen)
332 {
333 struct svc_sock *svsk =
334 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
335 struct msghdr msg = {
336 .msg_flags = MSG_DONTWAIT,
337 };
338 int len;
339
340 rqstp->rq_xprt_hlen = 0;
341
342 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
343 msg.msg_flags);
344
345 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
346 svsk, iov[0].iov_base, iov[0].iov_len, len);
347 return len;
348 }
349
350 static int svc_partial_recvfrom(struct svc_rqst *rqstp,
351 struct kvec *iov, int nr,
352 int buflen, unsigned int base)
353 {
354 size_t save_iovlen;
355 void *save_iovbase;
356 unsigned int i;
357 int ret;
358
359 if (base == 0)
360 return svc_recvfrom(rqstp, iov, nr, buflen);
361
362 for (i = 0; i < nr; i++) {
363 if (iov[i].iov_len > base)
364 break;
365 base -= iov[i].iov_len;
366 }
367 save_iovlen = iov[i].iov_len;
368 save_iovbase = iov[i].iov_base;
369 iov[i].iov_len -= base;
370 iov[i].iov_base += base;
371 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
372 iov[i].iov_len = save_iovlen;
373 iov[i].iov_base = save_iovbase;
374 return ret;
375 }
376
377 /*
378 * Set socket snd and rcv buffer lengths
379 */
380 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
381 unsigned int rcv)
382 {
383 #if 0
384 mm_segment_t oldfs;
385 oldfs = get_fs(); set_fs(KERNEL_DS);
386 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
387 (char*)&snd, sizeof(snd));
388 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
389 (char*)&rcv, sizeof(rcv));
390 #else
391 /* sock_setsockopt limits use to sysctl_?mem_max,
392 * which isn't acceptable. Until that is made conditional
393 * on not having CAP_SYS_RESOURCE or similar, we go direct...
394 * DaveM said I could!
395 */
396 lock_sock(sock->sk);
397 sock->sk->sk_sndbuf = snd * 2;
398 sock->sk->sk_rcvbuf = rcv * 2;
399 sock->sk->sk_write_space(sock->sk);
400 release_sock(sock->sk);
401 #endif
402 }
403 /*
404 * INET callback when data has been received on the socket.
405 */
406 static void svc_udp_data_ready(struct sock *sk, int count)
407 {
408 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
409 wait_queue_head_t *wq = sk_sleep(sk);
410
411 if (svsk) {
412 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
413 svsk, sk, count,
414 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
415 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
416 svc_xprt_enqueue(&svsk->sk_xprt);
417 }
418 if (wq && waitqueue_active(wq))
419 wake_up_interruptible(wq);
420 }
421
422 /*
423 * INET callback when space is newly available on the socket.
424 */
425 static void svc_write_space(struct sock *sk)
426 {
427 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
428 wait_queue_head_t *wq = sk_sleep(sk);
429
430 if (svsk) {
431 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
432 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
433 svc_xprt_enqueue(&svsk->sk_xprt);
434 }
435
436 if (wq && waitqueue_active(wq)) {
437 dprintk("RPC svc_write_space: someone sleeping on %p\n",
438 svsk);
439 wake_up_interruptible(wq);
440 }
441 }
442
443 static void svc_tcp_write_space(struct sock *sk)
444 {
445 struct socket *sock = sk->sk_socket;
446
447 if (sk_stream_is_writeable(sk) && sock)
448 clear_bit(SOCK_NOSPACE, &sock->flags);
449 svc_write_space(sk);
450 }
451
452 /*
453 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
454 */
455 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
456 struct cmsghdr *cmh)
457 {
458 struct in_pktinfo *pki = CMSG_DATA(cmh);
459 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
460
461 if (cmh->cmsg_type != IP_PKTINFO)
462 return 0;
463
464 daddr->sin_family = AF_INET;
465 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
466 return 1;
467 }
468
469 /*
470 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
471 */
472 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
473 struct cmsghdr *cmh)
474 {
475 struct in6_pktinfo *pki = CMSG_DATA(cmh);
476 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
477
478 if (cmh->cmsg_type != IPV6_PKTINFO)
479 return 0;
480
481 daddr->sin6_family = AF_INET6;
482 daddr->sin6_addr = pki->ipi6_addr;
483 daddr->sin6_scope_id = pki->ipi6_ifindex;
484 return 1;
485 }
486
487 /*
488 * Copy the UDP datagram's destination address to the rqstp structure.
489 * The 'destination' address in this case is the address to which the
490 * peer sent the datagram, i.e. our local address. For multihomed
491 * hosts, this can change from msg to msg. Note that only the IP
492 * address changes, the port number should remain the same.
493 */
494 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
495 struct cmsghdr *cmh)
496 {
497 switch (cmh->cmsg_level) {
498 case SOL_IP:
499 return svc_udp_get_dest_address4(rqstp, cmh);
500 case SOL_IPV6:
501 return svc_udp_get_dest_address6(rqstp, cmh);
502 }
503
504 return 0;
505 }
506
507 /*
508 * Receive a datagram from a UDP socket.
509 */
510 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
511 {
512 struct svc_sock *svsk =
513 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
514 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
515 struct sk_buff *skb;
516 union {
517 struct cmsghdr hdr;
518 long all[SVC_PKTINFO_SPACE / sizeof(long)];
519 } buffer;
520 struct cmsghdr *cmh = &buffer.hdr;
521 struct msghdr msg = {
522 .msg_name = svc_addr(rqstp),
523 .msg_control = cmh,
524 .msg_controllen = sizeof(buffer),
525 .msg_flags = MSG_DONTWAIT,
526 };
527 size_t len;
528 int err;
529
530 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
531 /* udp sockets need large rcvbuf as all pending
532 * requests are still in that buffer. sndbuf must
533 * also be large enough that there is enough space
534 * for one reply per thread. We count all threads
535 * rather than threads in a particular pool, which
536 * provides an upper bound on the number of threads
537 * which will access the socket.
538 */
539 svc_sock_setbufsize(svsk->sk_sock,
540 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
541 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
542
543 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
544 skb = NULL;
545 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
546 0, 0, MSG_PEEK | MSG_DONTWAIT);
547 if (err >= 0)
548 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
549
550 if (skb == NULL) {
551 if (err != -EAGAIN) {
552 /* possibly an icmp error */
553 dprintk("svc: recvfrom returned error %d\n", -err);
554 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
555 }
556 return 0;
557 }
558 len = svc_addr_len(svc_addr(rqstp));
559 rqstp->rq_addrlen = len;
560 if (skb->tstamp.tv64 == 0) {
561 skb->tstamp = ktime_get_real();
562 /* Don't enable netstamp, sunrpc doesn't
563 need that much accuracy */
564 }
565 svsk->sk_sk->sk_stamp = skb->tstamp;
566 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
567
568 len = skb->len - sizeof(struct udphdr);
569 rqstp->rq_arg.len = len;
570
571 rqstp->rq_prot = IPPROTO_UDP;
572
573 if (!svc_udp_get_dest_address(rqstp, cmh)) {
574 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
575 cmh->cmsg_level, cmh->cmsg_type);
576 goto out_free;
577 }
578 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
579
580 if (skb_is_nonlinear(skb)) {
581 /* we have to copy */
582 local_bh_disable();
583 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
584 local_bh_enable();
585 /* checksum error */
586 goto out_free;
587 }
588 local_bh_enable();
589 skb_free_datagram_locked(svsk->sk_sk, skb);
590 } else {
591 /* we can use it in-place */
592 rqstp->rq_arg.head[0].iov_base = skb->data +
593 sizeof(struct udphdr);
594 rqstp->rq_arg.head[0].iov_len = len;
595 if (skb_checksum_complete(skb))
596 goto out_free;
597 rqstp->rq_xprt_ctxt = skb;
598 }
599
600 rqstp->rq_arg.page_base = 0;
601 if (len <= rqstp->rq_arg.head[0].iov_len) {
602 rqstp->rq_arg.head[0].iov_len = len;
603 rqstp->rq_arg.page_len = 0;
604 rqstp->rq_respages = rqstp->rq_pages+1;
605 } else {
606 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
607 rqstp->rq_respages = rqstp->rq_pages + 1 +
608 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
609 }
610 rqstp->rq_next_page = rqstp->rq_respages+1;
611
612 if (serv->sv_stats)
613 serv->sv_stats->netudpcnt++;
614
615 return len;
616 out_free:
617 trace_kfree_skb(skb, svc_udp_recvfrom);
618 skb_free_datagram_locked(svsk->sk_sk, skb);
619 return 0;
620 }
621
622 static int
623 svc_udp_sendto(struct svc_rqst *rqstp)
624 {
625 int error;
626
627 error = svc_sendto(rqstp, &rqstp->rq_res);
628 if (error == -ECONNREFUSED)
629 /* ICMP error on earlier request. */
630 error = svc_sendto(rqstp, &rqstp->rq_res);
631
632 return error;
633 }
634
635 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
636 {
637 }
638
639 static int svc_udp_has_wspace(struct svc_xprt *xprt)
640 {
641 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
642 struct svc_serv *serv = xprt->xpt_server;
643 unsigned long required;
644
645 /*
646 * Set the SOCK_NOSPACE flag before checking the available
647 * sock space.
648 */
649 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
650 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
651 if (required*2 > sock_wspace(svsk->sk_sk))
652 return 0;
653 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
654 return 1;
655 }
656
657 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
658 {
659 BUG();
660 return NULL;
661 }
662
663 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
664 struct net *net,
665 struct sockaddr *sa, int salen,
666 int flags)
667 {
668 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
669 }
670
671 static struct svc_xprt_ops svc_udp_ops = {
672 .xpo_create = svc_udp_create,
673 .xpo_recvfrom = svc_udp_recvfrom,
674 .xpo_sendto = svc_udp_sendto,
675 .xpo_release_rqst = svc_release_skb,
676 .xpo_detach = svc_sock_detach,
677 .xpo_free = svc_sock_free,
678 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
679 .xpo_has_wspace = svc_udp_has_wspace,
680 .xpo_accept = svc_udp_accept,
681 };
682
683 static struct svc_xprt_class svc_udp_class = {
684 .xcl_name = "udp",
685 .xcl_owner = THIS_MODULE,
686 .xcl_ops = &svc_udp_ops,
687 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
688 };
689
690 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
691 {
692 int err, level, optname, one = 1;
693
694 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
695 &svsk->sk_xprt, serv);
696 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
697 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
698 svsk->sk_sk->sk_write_space = svc_write_space;
699
700 /* initialise setting must have enough space to
701 * receive and respond to one request.
702 * svc_udp_recvfrom will re-adjust if necessary
703 */
704 svc_sock_setbufsize(svsk->sk_sock,
705 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
706 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
707
708 /* data might have come in before data_ready set up */
709 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
710 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
711
712 /* make sure we get destination address info */
713 switch (svsk->sk_sk->sk_family) {
714 case AF_INET:
715 level = SOL_IP;
716 optname = IP_PKTINFO;
717 break;
718 case AF_INET6:
719 level = SOL_IPV6;
720 optname = IPV6_RECVPKTINFO;
721 break;
722 default:
723 BUG();
724 }
725 err = kernel_setsockopt(svsk->sk_sock, level, optname,
726 (char *)&one, sizeof(one));
727 dprintk("svc: kernel_setsockopt returned %d\n", err);
728 }
729
730 /*
731 * A data_ready event on a listening socket means there's a connection
732 * pending. Do not use state_change as a substitute for it.
733 */
734 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
735 {
736 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
737 wait_queue_head_t *wq;
738
739 dprintk("svc: socket %p TCP (listen) state change %d\n",
740 sk, sk->sk_state);
741
742 /*
743 * This callback may called twice when a new connection
744 * is established as a child socket inherits everything
745 * from a parent LISTEN socket.
746 * 1) data_ready method of the parent socket will be called
747 * when one of child sockets become ESTABLISHED.
748 * 2) data_ready method of the child socket may be called
749 * when it receives data before the socket is accepted.
750 * In case of 2, we should ignore it silently.
751 */
752 if (sk->sk_state == TCP_LISTEN) {
753 if (svsk) {
754 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
755 svc_xprt_enqueue(&svsk->sk_xprt);
756 } else
757 printk("svc: socket %p: no user data\n", sk);
758 }
759
760 wq = sk_sleep(sk);
761 if (wq && waitqueue_active(wq))
762 wake_up_interruptible_all(wq);
763 }
764
765 /*
766 * A state change on a connected socket means it's dying or dead.
767 */
768 static void svc_tcp_state_change(struct sock *sk)
769 {
770 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
771 wait_queue_head_t *wq = sk_sleep(sk);
772
773 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
774 sk, sk->sk_state, sk->sk_user_data);
775
776 if (!svsk)
777 printk("svc: socket %p: no user data\n", sk);
778 else {
779 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
780 svc_xprt_enqueue(&svsk->sk_xprt);
781 }
782 if (wq && waitqueue_active(wq))
783 wake_up_interruptible_all(wq);
784 }
785
786 static void svc_tcp_data_ready(struct sock *sk, int count)
787 {
788 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
789 wait_queue_head_t *wq = sk_sleep(sk);
790
791 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
792 sk, sk->sk_user_data);
793 if (svsk) {
794 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
795 svc_xprt_enqueue(&svsk->sk_xprt);
796 }
797 if (wq && waitqueue_active(wq))
798 wake_up_interruptible(wq);
799 }
800
801 /*
802 * Accept a TCP connection
803 */
804 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
805 {
806 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
807 struct sockaddr_storage addr;
808 struct sockaddr *sin = (struct sockaddr *) &addr;
809 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
810 struct socket *sock = svsk->sk_sock;
811 struct socket *newsock;
812 struct svc_sock *newsvsk;
813 int err, slen;
814 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
815
816 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
817 if (!sock)
818 return NULL;
819
820 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
821 err = kernel_accept(sock, &newsock, O_NONBLOCK);
822 if (err < 0) {
823 if (err == -ENOMEM)
824 printk(KERN_WARNING "%s: no more sockets!\n",
825 serv->sv_name);
826 else if (err != -EAGAIN)
827 net_warn_ratelimited("%s: accept failed (err %d)!\n",
828 serv->sv_name, -err);
829 return NULL;
830 }
831 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
832
833 err = kernel_getpeername(newsock, sin, &slen);
834 if (err < 0) {
835 net_warn_ratelimited("%s: peername failed (err %d)!\n",
836 serv->sv_name, -err);
837 goto failed; /* aborted connection or whatever */
838 }
839
840 /* Ideally, we would want to reject connections from unauthorized
841 * hosts here, but when we get encryption, the IP of the host won't
842 * tell us anything. For now just warn about unpriv connections.
843 */
844 if (!svc_port_is_privileged(sin)) {
845 dprintk(KERN_WARNING
846 "%s: connect from unprivileged port: %s\n",
847 serv->sv_name,
848 __svc_print_addr(sin, buf, sizeof(buf)));
849 }
850 dprintk("%s: connect from %s\n", serv->sv_name,
851 __svc_print_addr(sin, buf, sizeof(buf)));
852
853 /* make sure that a write doesn't block forever when
854 * low on memory
855 */
856 newsock->sk->sk_sndtimeo = HZ*30;
857
858 newsvsk = svc_setup_socket(serv, newsock,
859 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
860 if (IS_ERR(newsvsk))
861 goto failed;
862 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
863 err = kernel_getsockname(newsock, sin, &slen);
864 if (unlikely(err < 0)) {
865 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
866 slen = offsetof(struct sockaddr, sa_data);
867 }
868 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
869
870 if (serv->sv_stats)
871 serv->sv_stats->nettcpconn++;
872
873 return &newsvsk->sk_xprt;
874
875 failed:
876 sock_release(newsock);
877 return NULL;
878 }
879
880 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
881 {
882 unsigned int i, len, npages;
883
884 if (svsk->sk_datalen == 0)
885 return 0;
886 len = svsk->sk_datalen;
887 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
888 for (i = 0; i < npages; i++) {
889 if (rqstp->rq_pages[i] != NULL)
890 put_page(rqstp->rq_pages[i]);
891 BUG_ON(svsk->sk_pages[i] == NULL);
892 rqstp->rq_pages[i] = svsk->sk_pages[i];
893 svsk->sk_pages[i] = NULL;
894 }
895 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
896 return len;
897 }
898
899 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
900 {
901 unsigned int i, len, npages;
902
903 if (svsk->sk_datalen == 0)
904 return;
905 len = svsk->sk_datalen;
906 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
907 for (i = 0; i < npages; i++) {
908 svsk->sk_pages[i] = rqstp->rq_pages[i];
909 rqstp->rq_pages[i] = NULL;
910 }
911 }
912
913 static void svc_tcp_clear_pages(struct svc_sock *svsk)
914 {
915 unsigned int i, len, npages;
916
917 if (svsk->sk_datalen == 0)
918 goto out;
919 len = svsk->sk_datalen;
920 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
921 for (i = 0; i < npages; i++) {
922 if (svsk->sk_pages[i] == NULL) {
923 WARN_ON_ONCE(1);
924 continue;
925 }
926 put_page(svsk->sk_pages[i]);
927 svsk->sk_pages[i] = NULL;
928 }
929 out:
930 svsk->sk_tcplen = 0;
931 svsk->sk_datalen = 0;
932 }
933
934 /*
935 * Receive fragment record header.
936 * If we haven't gotten the record length yet, get the next four bytes.
937 */
938 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
939 {
940 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
941 unsigned int want;
942 int len;
943
944 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
945
946 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
947 struct kvec iov;
948
949 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
950 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
951 iov.iov_len = want;
952 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
953 goto error;
954 svsk->sk_tcplen += len;
955
956 if (len < want) {
957 dprintk("svc: short recvfrom while reading record "
958 "length (%d of %d)\n", len, want);
959 return -EAGAIN;
960 }
961
962 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
963 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
964 serv->sv_max_mesg) {
965 net_notice_ratelimited("RPC: fragment too large: %d\n",
966 svc_sock_reclen(svsk));
967 goto err_delete;
968 }
969 }
970
971 return svc_sock_reclen(svsk);
972 error:
973 dprintk("RPC: TCP recv_record got %d\n", len);
974 return len;
975 err_delete:
976 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
977 return -EAGAIN;
978 }
979
980 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
981 {
982 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
983 struct rpc_rqst *req = NULL;
984 struct kvec *src, *dst;
985 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
986 __be32 xid;
987 __be32 calldir;
988
989 xid = *p++;
990 calldir = *p;
991
992 if (bc_xprt)
993 req = xprt_lookup_rqst(bc_xprt, xid);
994
995 if (!req) {
996 printk(KERN_NOTICE
997 "%s: Got unrecognized reply: "
998 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
999 __func__, ntohl(calldir),
1000 bc_xprt, xid);
1001 return -EAGAIN;
1002 }
1003
1004 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1005 /*
1006 * XXX!: cheating for now! Only copying HEAD.
1007 * But we know this is good enough for now (in fact, for any
1008 * callback reply in the forseeable future).
1009 */
1010 dst = &req->rq_private_buf.head[0];
1011 src = &rqstp->rq_arg.head[0];
1012 if (dst->iov_len < src->iov_len)
1013 return -EAGAIN; /* whatever; just giving up. */
1014 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1015 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1016 rqstp->rq_arg.len = 0;
1017 return 0;
1018 }
1019
1020 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1021 {
1022 int i = 0;
1023 int t = 0;
1024
1025 while (t < len) {
1026 vec[i].iov_base = page_address(pages[i]);
1027 vec[i].iov_len = PAGE_SIZE;
1028 i++;
1029 t += PAGE_SIZE;
1030 }
1031 return i;
1032 }
1033
1034 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1035 {
1036 /* If we have more data, signal svc_xprt_enqueue() to try again */
1037 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1038 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1039 dprintk("svc: TCP %s record (%d bytes)\n",
1040 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1041 svc_sock_reclen(svsk));
1042 svsk->sk_tcplen = 0;
1043 svsk->sk_reclen = 0;
1044 }
1045
1046 /*
1047 * Receive data from a TCP socket.
1048 */
1049 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1050 {
1051 struct svc_sock *svsk =
1052 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1053 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1054 int len;
1055 struct kvec *vec;
1056 unsigned int want, base;
1057 __be32 *p;
1058 __be32 calldir;
1059 int pnum;
1060
1061 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1062 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1063 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1064 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1065
1066 len = svc_tcp_recv_record(svsk, rqstp);
1067 if (len < 0)
1068 goto error;
1069
1070 base = svc_tcp_restore_pages(svsk, rqstp);
1071 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1072
1073 vec = rqstp->rq_vec;
1074
1075 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1076 svsk->sk_datalen + want);
1077
1078 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1079 rqstp->rq_next_page = rqstp->rq_respages + 1;
1080
1081 /* Now receive data */
1082 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1083 if (len >= 0) {
1084 svsk->sk_tcplen += len;
1085 svsk->sk_datalen += len;
1086 }
1087 if (len != want || !svc_sock_final_rec(svsk)) {
1088 svc_tcp_save_pages(svsk, rqstp);
1089 if (len < 0 && len != -EAGAIN)
1090 goto err_delete;
1091 if (len == want)
1092 svc_tcp_fragment_received(svsk);
1093 else
1094 dprintk("svc: incomplete TCP record (%d of %d)\n",
1095 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1096 svc_sock_reclen(svsk));
1097 goto err_noclose;
1098 }
1099
1100 if (svsk->sk_datalen < 8) {
1101 svsk->sk_datalen = 0;
1102 goto err_delete; /* client is nuts. */
1103 }
1104
1105 rqstp->rq_arg.len = svsk->sk_datalen;
1106 rqstp->rq_arg.page_base = 0;
1107 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1108 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1109 rqstp->rq_arg.page_len = 0;
1110 } else
1111 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1112
1113 rqstp->rq_xprt_ctxt = NULL;
1114 rqstp->rq_prot = IPPROTO_TCP;
1115
1116 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1117 calldir = p[1];
1118 if (calldir)
1119 len = receive_cb_reply(svsk, rqstp);
1120
1121 /* Reset TCP read info */
1122 svsk->sk_datalen = 0;
1123 svc_tcp_fragment_received(svsk);
1124
1125 if (len < 0)
1126 goto error;
1127
1128 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1129 if (serv->sv_stats)
1130 serv->sv_stats->nettcpcnt++;
1131
1132 return rqstp->rq_arg.len;
1133
1134 error:
1135 if (len != -EAGAIN)
1136 goto err_delete;
1137 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1138 return 0;
1139 err_delete:
1140 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1141 svsk->sk_xprt.xpt_server->sv_name, -len);
1142 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1143 err_noclose:
1144 return 0; /* record not complete */
1145 }
1146
1147 /*
1148 * Send out data on TCP socket.
1149 */
1150 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1151 {
1152 struct xdr_buf *xbufp = &rqstp->rq_res;
1153 int sent;
1154 __be32 reclen;
1155
1156 /* Set up the first element of the reply kvec.
1157 * Any other kvecs that may be in use have been taken
1158 * care of by the server implementation itself.
1159 */
1160 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1161 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1162
1163 sent = svc_sendto(rqstp, &rqstp->rq_res);
1164 if (sent != xbufp->len) {
1165 printk(KERN_NOTICE
1166 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1167 "- shutting down socket\n",
1168 rqstp->rq_xprt->xpt_server->sv_name,
1169 (sent<0)?"got error":"sent only",
1170 sent, xbufp->len);
1171 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1172 svc_xprt_enqueue(rqstp->rq_xprt);
1173 sent = -EAGAIN;
1174 }
1175 return sent;
1176 }
1177
1178 /*
1179 * Setup response header. TCP has a 4B record length field.
1180 */
1181 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1182 {
1183 struct kvec *resv = &rqstp->rq_res.head[0];
1184
1185 /* tcp needs a space for the record length... */
1186 svc_putnl(resv, 0);
1187 }
1188
1189 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1190 {
1191 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1192 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1193 int required;
1194
1195 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1196 return 1;
1197 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1198 if (sk_stream_wspace(svsk->sk_sk) >= required ||
1199 (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
1200 atomic_read(&xprt->xpt_reserved) == 0))
1201 return 1;
1202 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1203 return 0;
1204 }
1205
1206 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1207 struct net *net,
1208 struct sockaddr *sa, int salen,
1209 int flags)
1210 {
1211 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1212 }
1213
1214 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1215 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1216 struct net *, struct sockaddr *,
1217 int, int);
1218 static void svc_bc_sock_free(struct svc_xprt *xprt);
1219
1220 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1221 struct net *net,
1222 struct sockaddr *sa, int salen,
1223 int flags)
1224 {
1225 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1226 }
1227
1228 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1229 {
1230 }
1231
1232 static struct svc_xprt_ops svc_tcp_bc_ops = {
1233 .xpo_create = svc_bc_tcp_create,
1234 .xpo_detach = svc_bc_tcp_sock_detach,
1235 .xpo_free = svc_bc_sock_free,
1236 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1237 };
1238
1239 static struct svc_xprt_class svc_tcp_bc_class = {
1240 .xcl_name = "tcp-bc",
1241 .xcl_owner = THIS_MODULE,
1242 .xcl_ops = &svc_tcp_bc_ops,
1243 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1244 };
1245
1246 static void svc_init_bc_xprt_sock(void)
1247 {
1248 svc_reg_xprt_class(&svc_tcp_bc_class);
1249 }
1250
1251 static void svc_cleanup_bc_xprt_sock(void)
1252 {
1253 svc_unreg_xprt_class(&svc_tcp_bc_class);
1254 }
1255 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1256 static void svc_init_bc_xprt_sock(void)
1257 {
1258 }
1259
1260 static void svc_cleanup_bc_xprt_sock(void)
1261 {
1262 }
1263 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1264
1265 static struct svc_xprt_ops svc_tcp_ops = {
1266 .xpo_create = svc_tcp_create,
1267 .xpo_recvfrom = svc_tcp_recvfrom,
1268 .xpo_sendto = svc_tcp_sendto,
1269 .xpo_release_rqst = svc_release_skb,
1270 .xpo_detach = svc_tcp_sock_detach,
1271 .xpo_free = svc_sock_free,
1272 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1273 .xpo_has_wspace = svc_tcp_has_wspace,
1274 .xpo_accept = svc_tcp_accept,
1275 };
1276
1277 static struct svc_xprt_class svc_tcp_class = {
1278 .xcl_name = "tcp",
1279 .xcl_owner = THIS_MODULE,
1280 .xcl_ops = &svc_tcp_ops,
1281 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1282 };
1283
1284 void svc_init_xprt_sock(void)
1285 {
1286 svc_reg_xprt_class(&svc_tcp_class);
1287 svc_reg_xprt_class(&svc_udp_class);
1288 svc_init_bc_xprt_sock();
1289 }
1290
1291 void svc_cleanup_xprt_sock(void)
1292 {
1293 svc_unreg_xprt_class(&svc_tcp_class);
1294 svc_unreg_xprt_class(&svc_udp_class);
1295 svc_cleanup_bc_xprt_sock();
1296 }
1297
1298 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1299 {
1300 struct sock *sk = svsk->sk_sk;
1301
1302 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1303 &svsk->sk_xprt, serv);
1304 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1305 if (sk->sk_state == TCP_LISTEN) {
1306 dprintk("setting up TCP socket for listening\n");
1307 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1308 sk->sk_data_ready = svc_tcp_listen_data_ready;
1309 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1310 } else {
1311 dprintk("setting up TCP socket for reading\n");
1312 sk->sk_state_change = svc_tcp_state_change;
1313 sk->sk_data_ready = svc_tcp_data_ready;
1314 sk->sk_write_space = svc_tcp_write_space;
1315
1316 svsk->sk_reclen = 0;
1317 svsk->sk_tcplen = 0;
1318 svsk->sk_datalen = 0;
1319 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1320
1321 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1322
1323 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1324 if (sk->sk_state != TCP_ESTABLISHED)
1325 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1326 }
1327 }
1328
1329 void svc_sock_update_bufs(struct svc_serv *serv)
1330 {
1331 /*
1332 * The number of server threads has changed. Update
1333 * rcvbuf and sndbuf accordingly on all sockets
1334 */
1335 struct svc_sock *svsk;
1336
1337 spin_lock_bh(&serv->sv_lock);
1338 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1339 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1340 spin_unlock_bh(&serv->sv_lock);
1341 }
1342 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1343
1344 /*
1345 * Initialize socket for RPC use and create svc_sock struct
1346 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1347 */
1348 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1349 struct socket *sock,
1350 int flags)
1351 {
1352 struct svc_sock *svsk;
1353 struct sock *inet;
1354 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1355 int err = 0;
1356
1357 dprintk("svc: svc_setup_socket %p\n", sock);
1358 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1359 if (!svsk)
1360 return ERR_PTR(-ENOMEM);
1361
1362 inet = sock->sk;
1363
1364 /* Register socket with portmapper */
1365 if (pmap_register)
1366 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1367 inet->sk_protocol,
1368 ntohs(inet_sk(inet)->inet_sport));
1369
1370 if (err < 0) {
1371 kfree(svsk);
1372 return ERR_PTR(err);
1373 }
1374
1375 inet->sk_user_data = svsk;
1376 svsk->sk_sock = sock;
1377 svsk->sk_sk = inet;
1378 svsk->sk_ostate = inet->sk_state_change;
1379 svsk->sk_odata = inet->sk_data_ready;
1380 svsk->sk_owspace = inet->sk_write_space;
1381
1382 /* Initialize the socket */
1383 if (sock->type == SOCK_DGRAM)
1384 svc_udp_init(svsk, serv);
1385 else {
1386 /* initialise setting must have enough space to
1387 * receive and respond to one request.
1388 */
1389 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1390 4 * serv->sv_max_mesg);
1391 svc_tcp_init(svsk, serv);
1392 }
1393
1394 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1395 svsk, svsk->sk_sk);
1396
1397 return svsk;
1398 }
1399
1400 /**
1401 * svc_addsock - add a listener socket to an RPC service
1402 * @serv: pointer to RPC service to which to add a new listener
1403 * @fd: file descriptor of the new listener
1404 * @name_return: pointer to buffer to fill in with name of listener
1405 * @len: size of the buffer
1406 *
1407 * Fills in socket name and returns positive length of name if successful.
1408 * Name is terminated with '\n'. On error, returns a negative errno
1409 * value.
1410 */
1411 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1412 const size_t len)
1413 {
1414 int err = 0;
1415 struct socket *so = sockfd_lookup(fd, &err);
1416 struct svc_sock *svsk = NULL;
1417 struct sockaddr_storage addr;
1418 struct sockaddr *sin = (struct sockaddr *)&addr;
1419 int salen;
1420
1421 if (!so)
1422 return err;
1423 err = -EAFNOSUPPORT;
1424 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1425 goto out;
1426 err = -EPROTONOSUPPORT;
1427 if (so->sk->sk_protocol != IPPROTO_TCP &&
1428 so->sk->sk_protocol != IPPROTO_UDP)
1429 goto out;
1430 err = -EISCONN;
1431 if (so->state > SS_UNCONNECTED)
1432 goto out;
1433 err = -ENOENT;
1434 if (!try_module_get(THIS_MODULE))
1435 goto out;
1436 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1437 if (IS_ERR(svsk)) {
1438 module_put(THIS_MODULE);
1439 err = PTR_ERR(svsk);
1440 goto out;
1441 }
1442 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1443 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1444 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1445 return svc_one_sock_name(svsk, name_return, len);
1446 out:
1447 sockfd_put(so);
1448 return err;
1449 }
1450 EXPORT_SYMBOL_GPL(svc_addsock);
1451
1452 /*
1453 * Create socket for RPC service.
1454 */
1455 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1456 int protocol,
1457 struct net *net,
1458 struct sockaddr *sin, int len,
1459 int flags)
1460 {
1461 struct svc_sock *svsk;
1462 struct socket *sock;
1463 int error;
1464 int type;
1465 struct sockaddr_storage addr;
1466 struct sockaddr *newsin = (struct sockaddr *)&addr;
1467 int newlen;
1468 int family;
1469 int val;
1470 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1471
1472 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1473 serv->sv_program->pg_name, protocol,
1474 __svc_print_addr(sin, buf, sizeof(buf)));
1475
1476 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1477 printk(KERN_WARNING "svc: only UDP and TCP "
1478 "sockets supported\n");
1479 return ERR_PTR(-EINVAL);
1480 }
1481
1482 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1483 switch (sin->sa_family) {
1484 case AF_INET6:
1485 family = PF_INET6;
1486 break;
1487 case AF_INET:
1488 family = PF_INET;
1489 break;
1490 default:
1491 return ERR_PTR(-EINVAL);
1492 }
1493
1494 error = __sock_create(net, family, type, protocol, &sock, 1);
1495 if (error < 0)
1496 return ERR_PTR(error);
1497
1498 svc_reclassify_socket(sock);
1499
1500 /*
1501 * If this is an PF_INET6 listener, we want to avoid
1502 * getting requests from IPv4 remotes. Those should
1503 * be shunted to a PF_INET listener via rpcbind.
1504 */
1505 val = 1;
1506 if (family == PF_INET6)
1507 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1508 (char *)&val, sizeof(val));
1509
1510 if (type == SOCK_STREAM)
1511 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1512 error = kernel_bind(sock, sin, len);
1513 if (error < 0)
1514 goto bummer;
1515
1516 newlen = len;
1517 error = kernel_getsockname(sock, newsin, &newlen);
1518 if (error < 0)
1519 goto bummer;
1520
1521 if (protocol == IPPROTO_TCP) {
1522 if ((error = kernel_listen(sock, 64)) < 0)
1523 goto bummer;
1524 }
1525
1526 svsk = svc_setup_socket(serv, sock, flags);
1527 if (IS_ERR(svsk)) {
1528 error = PTR_ERR(svsk);
1529 goto bummer;
1530 }
1531 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1532 return (struct svc_xprt *)svsk;
1533 bummer:
1534 dprintk("svc: svc_create_socket error = %d\n", -error);
1535 sock_release(sock);
1536 return ERR_PTR(error);
1537 }
1538
1539 /*
1540 * Detach the svc_sock from the socket so that no
1541 * more callbacks occur.
1542 */
1543 static void svc_sock_detach(struct svc_xprt *xprt)
1544 {
1545 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1546 struct sock *sk = svsk->sk_sk;
1547 wait_queue_head_t *wq;
1548
1549 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1550
1551 /* put back the old socket callbacks */
1552 sk->sk_state_change = svsk->sk_ostate;
1553 sk->sk_data_ready = svsk->sk_odata;
1554 sk->sk_write_space = svsk->sk_owspace;
1555
1556 wq = sk_sleep(sk);
1557 if (wq && waitqueue_active(wq))
1558 wake_up_interruptible(wq);
1559 }
1560
1561 /*
1562 * Disconnect the socket, and reset the callbacks
1563 */
1564 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1565 {
1566 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1567
1568 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1569
1570 svc_sock_detach(xprt);
1571
1572 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1573 svc_tcp_clear_pages(svsk);
1574 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1575 }
1576 }
1577
1578 /*
1579 * Free the svc_sock's socket resources and the svc_sock itself.
1580 */
1581 static void svc_sock_free(struct svc_xprt *xprt)
1582 {
1583 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1584 dprintk("svc: svc_sock_free(%p)\n", svsk);
1585
1586 if (svsk->sk_sock->file)
1587 sockfd_put(svsk->sk_sock);
1588 else
1589 sock_release(svsk->sk_sock);
1590 kfree(svsk);
1591 }
1592
1593 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1594 /*
1595 * Create a back channel svc_xprt which shares the fore channel socket.
1596 */
1597 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1598 int protocol,
1599 struct net *net,
1600 struct sockaddr *sin, int len,
1601 int flags)
1602 {
1603 struct svc_sock *svsk;
1604 struct svc_xprt *xprt;
1605
1606 if (protocol != IPPROTO_TCP) {
1607 printk(KERN_WARNING "svc: only TCP sockets"
1608 " supported on shared back channel\n");
1609 return ERR_PTR(-EINVAL);
1610 }
1611
1612 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1613 if (!svsk)
1614 return ERR_PTR(-ENOMEM);
1615
1616 xprt = &svsk->sk_xprt;
1617 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1618
1619 serv->sv_bc_xprt = xprt;
1620
1621 return xprt;
1622 }
1623
1624 /*
1625 * Free a back channel svc_sock.
1626 */
1627 static void svc_bc_sock_free(struct svc_xprt *xprt)
1628 {
1629 if (xprt)
1630 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1631 }
1632 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
Linus' kernel tree