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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / net / sunrpc / svcsock.c
blob519cf9c4f8fd8bf46539c8b0ddca293838fde26a
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/net/sunrpc/svcsock.c
4 *
5 * These are the RPC server socket internals.
6 *
7 * The server scheduling algorithm does not always distribute the load
8 * evenly when servicing a single client. May need to modify the
9 * svc_xprt_enqueue procedure...
10 *
11 * TCP support is largely untested and may be a little slow. The problem
12 * is that we currently do two separate recvfrom's, one for the 4-byte
13 * record length, and the second for the actual record. This could possibly
14 * be improved by always reading a minimum size of around 100 bytes and
15 * tucking any superfluous bytes away in a temporary store. Still, that
16 * leaves write requests out in the rain. An alternative may be to peek at
17 * the first skb in the queue, and if it matches the next TCP sequence
18 * number, to extract the record marker. Yuck.
19 *
20 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/module.h>
26 #include <linux/errno.h>
27 #include <linux/fcntl.h>
28 #include <linux/net.h>
29 #include <linux/in.h>
30 #include <linux/inet.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/unistd.h>
34 #include <linux/slab.h>
35 #include <linux/netdevice.h>
36 #include <linux/skbuff.h>
37 #include <linux/file.h>
38 #include <linux/freezer.h>
39 #include <net/sock.h>
40 #include <net/checksum.h>
41 #include <net/ip.h>
42 #include <net/ipv6.h>
43 #include <net/udp.h>
44 #include <net/tcp.h>
45 #include <net/tcp_states.h>
46 #include <linux/uaccess.h>
47 #include <asm/ioctls.h>
48 #include <trace/events/skb.h>
49
50 #include <linux/sunrpc/types.h>
51 #include <linux/sunrpc/clnt.h>
52 #include <linux/sunrpc/xdr.h>
53 #include <linux/sunrpc/msg_prot.h>
54 #include <linux/sunrpc/svcsock.h>
55 #include <linux/sunrpc/stats.h>
56 #include <linux/sunrpc/xprt.h>
57
58 #include "socklib.h"
59 #include "sunrpc.h"
60
61 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
62
63
64 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
65 int flags);
66 static int svc_udp_recvfrom(struct svc_rqst *);
67 static int svc_udp_sendto(struct svc_rqst *);
68 static void svc_sock_detach(struct svc_xprt *);
69 static void svc_tcp_sock_detach(struct svc_xprt *);
70 static void svc_sock_free(struct svc_xprt *);
71
72 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
73 struct net *, struct sockaddr *,
74 int, int);
75 #ifdef CONFIG_DEBUG_LOCK_ALLOC
76 static struct lock_class_key svc_key[2];
77 static struct lock_class_key svc_slock_key[2];
78
79 static void svc_reclassify_socket(struct socket *sock)
80 {
81 struct sock *sk = sock->sk;
82
83 if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
84 return;
85
86 switch (sk->sk_family) {
87 case AF_INET:
88 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
89 &svc_slock_key[0],
90 "sk_xprt.xpt_lock-AF_INET-NFSD",
91 &svc_key[0]);
92 break;
93
94 case AF_INET6:
95 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
96 &svc_slock_key[1],
97 "sk_xprt.xpt_lock-AF_INET6-NFSD",
98 &svc_key[1]);
99 break;
100
101 default:
102 BUG();
103 }
104 }
105 #else
106 static void svc_reclassify_socket(struct socket *sock)
107 {
108 }
109 #endif
110
111 /*
112 * Release an skbuff after use
113 */
114 static void svc_release_skb(struct svc_rqst *rqstp)
115 {
116 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
117
118 if (skb) {
119 struct svc_sock *svsk =
120 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
121 rqstp->rq_xprt_ctxt = NULL;
122
123 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
124 skb_free_datagram_locked(svsk->sk_sk, skb);
125 }
126 }
127
128 static void svc_release_udp_skb(struct svc_rqst *rqstp)
129 {
130 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
131
132 if (skb) {
133 rqstp->rq_xprt_ctxt = NULL;
134
135 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
136 consume_skb(skb);
137 }
138 }
139
140 union svc_pktinfo_u {
141 struct in_pktinfo pkti;
142 struct in6_pktinfo pkti6;
143 };
144 #define SVC_PKTINFO_SPACE \
145 CMSG_SPACE(sizeof(union svc_pktinfo_u))
146
147 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
148 {
149 struct svc_sock *svsk =
150 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
151 switch (svsk->sk_sk->sk_family) {
152 case AF_INET: {
153 struct in_pktinfo *pki = CMSG_DATA(cmh);
154
155 cmh->cmsg_level = SOL_IP;
156 cmh->cmsg_type = IP_PKTINFO;
157 pki->ipi_ifindex = 0;
158 pki->ipi_spec_dst.s_addr =
159 svc_daddr_in(rqstp)->sin_addr.s_addr;
160 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
161 }
162 break;
163
164 case AF_INET6: {
165 struct in6_pktinfo *pki = CMSG_DATA(cmh);
166 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
167
168 cmh->cmsg_level = SOL_IPV6;
169 cmh->cmsg_type = IPV6_PKTINFO;
170 pki->ipi6_ifindex = daddr->sin6_scope_id;
171 pki->ipi6_addr = daddr->sin6_addr;
172 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
173 }
174 break;
175 }
176 }
177
178 static int svc_sock_read_payload(struct svc_rqst *rqstp, unsigned int offset,
179 unsigned int length)
180 {
181 return 0;
182 }
183
184 /*
185 * Report socket names for nfsdfs
186 */
187 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
188 {
189 const struct sock *sk = svsk->sk_sk;
190 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
191 "udp" : "tcp";
192 int len;
193
194 switch (sk->sk_family) {
195 case PF_INET:
196 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
197 proto_name,
198 &inet_sk(sk)->inet_rcv_saddr,
199 inet_sk(sk)->inet_num);
200 break;
201 #if IS_ENABLED(CONFIG_IPV6)
202 case PF_INET6:
203 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
204 proto_name,
205 &sk->sk_v6_rcv_saddr,
206 inet_sk(sk)->inet_num);
207 break;
208 #endif
209 default:
210 len = snprintf(buf, remaining, "*unknown-%d*\n",
211 sk->sk_family);
212 }
213
214 if (len >= remaining) {
215 *buf = '\0';
216 return -ENAMETOOLONG;
217 }
218 return len;
219 }
220
221 /*
222 * Generic recvfrom routine.
223 */
224 static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov,
225 unsigned int nr, size_t buflen, unsigned int base)
226 {
227 struct svc_sock *svsk =
228 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
229 struct msghdr msg = { NULL };
230 ssize_t len;
231
232 rqstp->rq_xprt_hlen = 0;
233
234 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
235 iov_iter_kvec(&msg.msg_iter, READ, iov, nr, buflen);
236 if (base != 0) {
237 iov_iter_advance(&msg.msg_iter, base);
238 buflen -= base;
239 }
240 len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
241 /* If we read a full record, then assume there may be more
242 * data to read (stream based sockets only!)
243 */
244 if (len == buflen)
245 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
246
247 dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n",
248 svsk, iov[0].iov_base, iov[0].iov_len, len);
249 return len;
250 }
251
252 /*
253 * Set socket snd and rcv buffer lengths
254 */
255 static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs)
256 {
257 unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg;
258 struct socket *sock = svsk->sk_sock;
259
260 nreqs = min(nreqs, INT_MAX / 2 / max_mesg);
261
262 lock_sock(sock->sk);
263 sock->sk->sk_sndbuf = nreqs * max_mesg * 2;
264 sock->sk->sk_rcvbuf = nreqs * max_mesg * 2;
265 sock->sk->sk_write_space(sock->sk);
266 release_sock(sock->sk);
267 }
268
269 static void svc_sock_secure_port(struct svc_rqst *rqstp)
270 {
271 if (svc_port_is_privileged(svc_addr(rqstp)))
272 set_bit(RQ_SECURE, &rqstp->rq_flags);
273 else
274 clear_bit(RQ_SECURE, &rqstp->rq_flags);
275 }
276
277 /*
278 * INET callback when data has been received on the socket.
279 */
280 static void svc_data_ready(struct sock *sk)
281 {
282 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
283
284 if (svsk) {
285 dprintk("svc: socket %p(inet %p), busy=%d\n",
286 svsk, sk,
287 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
288
289 /* Refer to svc_setup_socket() for details. */
290 rmb();
291 svsk->sk_odata(sk);
292 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
293 svc_xprt_enqueue(&svsk->sk_xprt);
294 }
295 }
296
297 /*
298 * INET callback when space is newly available on the socket.
299 */
300 static void svc_write_space(struct sock *sk)
301 {
302 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
303
304 if (svsk) {
305 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
306 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
307
308 /* Refer to svc_setup_socket() for details. */
309 rmb();
310 svsk->sk_owspace(sk);
311 svc_xprt_enqueue(&svsk->sk_xprt);
312 }
313 }
314
315 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
316 {
317 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
318
319 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
320 return 1;
321 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
322 }
323
324 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
325 {
326 struct svc_sock *svsk;
327 struct socket *sock;
328 struct linger no_linger = {
329 .l_onoff = 1,
330 .l_linger = 0,
331 };
332
333 svsk = container_of(xprt, struct svc_sock, sk_xprt);
334 sock = svsk->sk_sock;
335 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
336 (char *)&no_linger, sizeof(no_linger));
337 }
338
339 /*
340 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
341 */
342 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
343 struct cmsghdr *cmh)
344 {
345 struct in_pktinfo *pki = CMSG_DATA(cmh);
346 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
347
348 if (cmh->cmsg_type != IP_PKTINFO)
349 return 0;
350
351 daddr->sin_family = AF_INET;
352 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
353 return 1;
354 }
355
356 /*
357 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
358 */
359 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
360 struct cmsghdr *cmh)
361 {
362 struct in6_pktinfo *pki = CMSG_DATA(cmh);
363 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
364
365 if (cmh->cmsg_type != IPV6_PKTINFO)
366 return 0;
367
368 daddr->sin6_family = AF_INET6;
369 daddr->sin6_addr = pki->ipi6_addr;
370 daddr->sin6_scope_id = pki->ipi6_ifindex;
371 return 1;
372 }
373
374 /*
375 * Copy the UDP datagram's destination address to the rqstp structure.
376 * The 'destination' address in this case is the address to which the
377 * peer sent the datagram, i.e. our local address. For multihomed
378 * hosts, this can change from msg to msg. Note that only the IP
379 * address changes, the port number should remain the same.
380 */
381 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
382 struct cmsghdr *cmh)
383 {
384 switch (cmh->cmsg_level) {
385 case SOL_IP:
386 return svc_udp_get_dest_address4(rqstp, cmh);
387 case SOL_IPV6:
388 return svc_udp_get_dest_address6(rqstp, cmh);
389 }
390
391 return 0;
392 }
393
394 /*
395 * Receive a datagram from a UDP socket.
396 */
397 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
398 {
399 struct svc_sock *svsk =
400 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
401 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
402 struct sk_buff *skb;
403 union {
404 struct cmsghdr hdr;
405 long all[SVC_PKTINFO_SPACE / sizeof(long)];
406 } buffer;
407 struct cmsghdr *cmh = &buffer.hdr;
408 struct msghdr msg = {
409 .msg_name = svc_addr(rqstp),
410 .msg_control = cmh,
411 .msg_controllen = sizeof(buffer),
412 .msg_flags = MSG_DONTWAIT,
413 };
414 size_t len;
415 int err;
416
417 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
418 /* udp sockets need large rcvbuf as all pending
419 * requests are still in that buffer. sndbuf must
420 * also be large enough that there is enough space
421 * for one reply per thread. We count all threads
422 * rather than threads in a particular pool, which
423 * provides an upper bound on the number of threads
424 * which will access the socket.
425 */
426 svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3);
427
428 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
429 skb = NULL;
430 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
431 0, 0, MSG_PEEK | MSG_DONTWAIT);
432 if (err >= 0)
433 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
434
435 if (skb == NULL) {
436 if (err != -EAGAIN) {
437 /* possibly an icmp error */
438 dprintk("svc: recvfrom returned error %d\n", -err);
439 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
440 }
441 return 0;
442 }
443 len = svc_addr_len(svc_addr(rqstp));
444 rqstp->rq_addrlen = len;
445 if (skb->tstamp == 0) {
446 skb->tstamp = ktime_get_real();
447 /* Don't enable netstamp, sunrpc doesn't
448 need that much accuracy */
449 }
450 sock_write_timestamp(svsk->sk_sk, skb->tstamp);
451 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
452
453 len = skb->len;
454 rqstp->rq_arg.len = len;
455
456 rqstp->rq_prot = IPPROTO_UDP;
457
458 if (!svc_udp_get_dest_address(rqstp, cmh)) {
459 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
460 cmh->cmsg_level, cmh->cmsg_type);
461 goto out_free;
462 }
463 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
464
465 if (skb_is_nonlinear(skb)) {
466 /* we have to copy */
467 local_bh_disable();
468 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
469 local_bh_enable();
470 /* checksum error */
471 goto out_free;
472 }
473 local_bh_enable();
474 consume_skb(skb);
475 } else {
476 /* we can use it in-place */
477 rqstp->rq_arg.head[0].iov_base = skb->data;
478 rqstp->rq_arg.head[0].iov_len = len;
479 if (skb_checksum_complete(skb))
480 goto out_free;
481 rqstp->rq_xprt_ctxt = skb;
482 }
483
484 rqstp->rq_arg.page_base = 0;
485 if (len <= rqstp->rq_arg.head[0].iov_len) {
486 rqstp->rq_arg.head[0].iov_len = len;
487 rqstp->rq_arg.page_len = 0;
488 rqstp->rq_respages = rqstp->rq_pages+1;
489 } else {
490 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
491 rqstp->rq_respages = rqstp->rq_pages + 1 +
492 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
493 }
494 rqstp->rq_next_page = rqstp->rq_respages+1;
495
496 if (serv->sv_stats)
497 serv->sv_stats->netudpcnt++;
498
499 return len;
500 out_free:
501 kfree_skb(skb);
502 return 0;
503 }
504
505 /**
506 * svc_udp_sendto - Send out a reply on a UDP socket
507 * @rqstp: completed svc_rqst
508 *
509 * Returns the number of bytes sent, or a negative errno.
510 */
511 static int svc_udp_sendto(struct svc_rqst *rqstp)
512 {
513 struct svc_xprt *xprt = rqstp->rq_xprt;
514 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
515 struct xdr_buf *xdr = &rqstp->rq_res;
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 = &rqstp->rq_addr,
523 .msg_namelen = rqstp->rq_addrlen,
524 .msg_control = cmh,
525 .msg_controllen = sizeof(buffer),
526 };
527 unsigned int uninitialized_var(sent);
528 int err;
529
530 svc_set_cmsg_data(rqstp, cmh);
531
532 err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
533 xdr_free_bvec(xdr);
534 if (err == -ECONNREFUSED) {
535 /* ICMP error on earlier request. */
536 err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
537 xdr_free_bvec(xdr);
538 }
539 if (err < 0)
540 return err;
541 return sent;
542 }
543
544 static int svc_udp_has_wspace(struct svc_xprt *xprt)
545 {
546 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
547 struct svc_serv *serv = xprt->xpt_server;
548 unsigned long required;
549
550 /*
551 * Set the SOCK_NOSPACE flag before checking the available
552 * sock space.
553 */
554 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
555 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
556 if (required*2 > sock_wspace(svsk->sk_sk))
557 return 0;
558 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
559 return 1;
560 }
561
562 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
563 {
564 BUG();
565 return NULL;
566 }
567
568 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
569 {
570 }
571
572 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
573 struct net *net,
574 struct sockaddr *sa, int salen,
575 int flags)
576 {
577 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
578 }
579
580 static const struct svc_xprt_ops svc_udp_ops = {
581 .xpo_create = svc_udp_create,
582 .xpo_recvfrom = svc_udp_recvfrom,
583 .xpo_sendto = svc_udp_sendto,
584 .xpo_read_payload = svc_sock_read_payload,
585 .xpo_release_rqst = svc_release_udp_skb,
586 .xpo_detach = svc_sock_detach,
587 .xpo_free = svc_sock_free,
588 .xpo_has_wspace = svc_udp_has_wspace,
589 .xpo_accept = svc_udp_accept,
590 .xpo_secure_port = svc_sock_secure_port,
591 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
592 };
593
594 static struct svc_xprt_class svc_udp_class = {
595 .xcl_name = "udp",
596 .xcl_owner = THIS_MODULE,
597 .xcl_ops = &svc_udp_ops,
598 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
599 .xcl_ident = XPRT_TRANSPORT_UDP,
600 };
601
602 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
603 {
604 int err, level, optname, one = 1;
605
606 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
607 &svsk->sk_xprt, serv);
608 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
609 svsk->sk_sk->sk_data_ready = svc_data_ready;
610 svsk->sk_sk->sk_write_space = svc_write_space;
611
612 /* initialise setting must have enough space to
613 * receive and respond to one request.
614 * svc_udp_recvfrom will re-adjust if necessary
615 */
616 svc_sock_setbufsize(svsk, 3);
617
618 /* data might have come in before data_ready set up */
619 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
620 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
621
622 /* make sure we get destination address info */
623 switch (svsk->sk_sk->sk_family) {
624 case AF_INET:
625 level = SOL_IP;
626 optname = IP_PKTINFO;
627 break;
628 case AF_INET6:
629 level = SOL_IPV6;
630 optname = IPV6_RECVPKTINFO;
631 break;
632 default:
633 BUG();
634 }
635 err = kernel_setsockopt(svsk->sk_sock, level, optname,
636 (char *)&one, sizeof(one));
637 dprintk("svc: kernel_setsockopt returned %d\n", err);
638 }
639
640 /*
641 * A data_ready event on a listening socket means there's a connection
642 * pending. Do not use state_change as a substitute for it.
643 */
644 static void svc_tcp_listen_data_ready(struct sock *sk)
645 {
646 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
647
648 dprintk("svc: socket %p TCP (listen) state change %d\n",
649 sk, sk->sk_state);
650
651 if (svsk) {
652 /* Refer to svc_setup_socket() for details. */
653 rmb();
654 svsk->sk_odata(sk);
655 }
656
657 /*
658 * This callback may called twice when a new connection
659 * is established as a child socket inherits everything
660 * from a parent LISTEN socket.
661 * 1) data_ready method of the parent socket will be called
662 * when one of child sockets become ESTABLISHED.
663 * 2) data_ready method of the child socket may be called
664 * when it receives data before the socket is accepted.
665 * In case of 2, we should ignore it silently.
666 */
667 if (sk->sk_state == TCP_LISTEN) {
668 if (svsk) {
669 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
670 svc_xprt_enqueue(&svsk->sk_xprt);
671 } else
672 printk("svc: socket %p: no user data\n", sk);
673 }
674 }
675
676 /*
677 * A state change on a connected socket means it's dying or dead.
678 */
679 static void svc_tcp_state_change(struct sock *sk)
680 {
681 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
682
683 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
684 sk, sk->sk_state, sk->sk_user_data);
685
686 if (!svsk)
687 printk("svc: socket %p: no user data\n", sk);
688 else {
689 /* Refer to svc_setup_socket() for details. */
690 rmb();
691 svsk->sk_ostate(sk);
692 if (sk->sk_state != TCP_ESTABLISHED) {
693 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
694 svc_xprt_enqueue(&svsk->sk_xprt);
695 }
696 }
697 }
698
699 /*
700 * Accept a TCP connection
701 */
702 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
703 {
704 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
705 struct sockaddr_storage addr;
706 struct sockaddr *sin = (struct sockaddr *) &addr;
707 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
708 struct socket *sock = svsk->sk_sock;
709 struct socket *newsock;
710 struct svc_sock *newsvsk;
711 int err, slen;
712 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
713
714 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
715 if (!sock)
716 return NULL;
717
718 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
719 err = kernel_accept(sock, &newsock, O_NONBLOCK);
720 if (err < 0) {
721 if (err == -ENOMEM)
722 printk(KERN_WARNING "%s: no more sockets!\n",
723 serv->sv_name);
724 else if (err != -EAGAIN)
725 net_warn_ratelimited("%s: accept failed (err %d)!\n",
726 serv->sv_name, -err);
727 return NULL;
728 }
729 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
730
731 err = kernel_getpeername(newsock, sin);
732 if (err < 0) {
733 net_warn_ratelimited("%s: peername failed (err %d)!\n",
734 serv->sv_name, -err);
735 goto failed; /* aborted connection or whatever */
736 }
737 slen = err;
738
739 /* Ideally, we would want to reject connections from unauthorized
740 * hosts here, but when we get encryption, the IP of the host won't
741 * tell us anything. For now just warn about unpriv connections.
742 */
743 if (!svc_port_is_privileged(sin)) {
744 dprintk("%s: connect from unprivileged port: %s\n",
745 serv->sv_name,
746 __svc_print_addr(sin, buf, sizeof(buf)));
747 }
748 dprintk("%s: connect from %s\n", serv->sv_name,
749 __svc_print_addr(sin, buf, sizeof(buf)));
750
751 /* Reset the inherited callbacks before calling svc_setup_socket */
752 newsock->sk->sk_state_change = svsk->sk_ostate;
753 newsock->sk->sk_data_ready = svsk->sk_odata;
754 newsock->sk->sk_write_space = svsk->sk_owspace;
755
756 /* make sure that a write doesn't block forever when
757 * low on memory
758 */
759 newsock->sk->sk_sndtimeo = HZ*30;
760
761 newsvsk = svc_setup_socket(serv, newsock,
762 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
763 if (IS_ERR(newsvsk))
764 goto failed;
765 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
766 err = kernel_getsockname(newsock, sin);
767 slen = err;
768 if (unlikely(err < 0)) {
769 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
770 slen = offsetof(struct sockaddr, sa_data);
771 }
772 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
773
774 if (sock_is_loopback(newsock->sk))
775 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
776 else
777 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
778 if (serv->sv_stats)
779 serv->sv_stats->nettcpconn++;
780
781 return &newsvsk->sk_xprt;
782
783 failed:
784 sock_release(newsock);
785 return NULL;
786 }
787
788 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
789 {
790 unsigned int i, len, npages;
791
792 if (svsk->sk_datalen == 0)
793 return 0;
794 len = svsk->sk_datalen;
795 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
796 for (i = 0; i < npages; i++) {
797 if (rqstp->rq_pages[i] != NULL)
798 put_page(rqstp->rq_pages[i]);
799 BUG_ON(svsk->sk_pages[i] == NULL);
800 rqstp->rq_pages[i] = svsk->sk_pages[i];
801 svsk->sk_pages[i] = NULL;
802 }
803 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
804 return len;
805 }
806
807 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
808 {
809 unsigned int i, len, npages;
810
811 if (svsk->sk_datalen == 0)
812 return;
813 len = svsk->sk_datalen;
814 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
815 for (i = 0; i < npages; i++) {
816 svsk->sk_pages[i] = rqstp->rq_pages[i];
817 rqstp->rq_pages[i] = NULL;
818 }
819 }
820
821 static void svc_tcp_clear_pages(struct svc_sock *svsk)
822 {
823 unsigned int i, len, npages;
824
825 if (svsk->sk_datalen == 0)
826 goto out;
827 len = svsk->sk_datalen;
828 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
829 for (i = 0; i < npages; i++) {
830 if (svsk->sk_pages[i] == NULL) {
831 WARN_ON_ONCE(1);
832 continue;
833 }
834 put_page(svsk->sk_pages[i]);
835 svsk->sk_pages[i] = NULL;
836 }
837 out:
838 svsk->sk_tcplen = 0;
839 svsk->sk_datalen = 0;
840 }
841
842 /*
843 * Receive fragment record header.
844 * If we haven't gotten the record length yet, get the next four bytes.
845 */
846 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
847 {
848 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
849 unsigned int want;
850 int len;
851
852 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
853 struct kvec iov;
854
855 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
856 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
857 iov.iov_len = want;
858 len = svc_recvfrom(rqstp, &iov, 1, want, 0);
859 if (len < 0)
860 goto error;
861 svsk->sk_tcplen += len;
862
863 if (len < want) {
864 dprintk("svc: short recvfrom while reading record "
865 "length (%d of %d)\n", len, want);
866 return -EAGAIN;
867 }
868
869 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
870 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
871 serv->sv_max_mesg) {
872 net_notice_ratelimited("RPC: fragment too large: %d\n",
873 svc_sock_reclen(svsk));
874 goto err_delete;
875 }
876 }
877
878 return svc_sock_reclen(svsk);
879 error:
880 dprintk("RPC: TCP recv_record got %d\n", len);
881 return len;
882 err_delete:
883 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
884 return -EAGAIN;
885 }
886
887 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
888 {
889 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
890 struct rpc_rqst *req = NULL;
891 struct kvec *src, *dst;
892 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
893 __be32 xid;
894 __be32 calldir;
895
896 xid = *p++;
897 calldir = *p;
898
899 if (!bc_xprt)
900 return -EAGAIN;
901 spin_lock(&bc_xprt->queue_lock);
902 req = xprt_lookup_rqst(bc_xprt, xid);
903 if (!req)
904 goto unlock_notfound;
905
906 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
907 /*
908 * XXX!: cheating for now! Only copying HEAD.
909 * But we know this is good enough for now (in fact, for any
910 * callback reply in the forseeable future).
911 */
912 dst = &req->rq_private_buf.head[0];
913 src = &rqstp->rq_arg.head[0];
914 if (dst->iov_len < src->iov_len)
915 goto unlock_eagain; /* whatever; just giving up. */
916 memcpy(dst->iov_base, src->iov_base, src->iov_len);
917 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
918 rqstp->rq_arg.len = 0;
919 spin_unlock(&bc_xprt->queue_lock);
920 return 0;
921 unlock_notfound:
922 printk(KERN_NOTICE
923 "%s: Got unrecognized reply: "
924 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
925 __func__, ntohl(calldir),
926 bc_xprt, ntohl(xid));
927 unlock_eagain:
928 spin_unlock(&bc_xprt->queue_lock);
929 return -EAGAIN;
930 }
931
932 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
933 {
934 int i = 0;
935 int t = 0;
936
937 while (t < len) {
938 vec[i].iov_base = page_address(pages[i]);
939 vec[i].iov_len = PAGE_SIZE;
940 i++;
941 t += PAGE_SIZE;
942 }
943 return i;
944 }
945
946 static void svc_tcp_fragment_received(struct svc_sock *svsk)
947 {
948 /* If we have more data, signal svc_xprt_enqueue() to try again */
949 dprintk("svc: TCP %s record (%d bytes)\n",
950 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
951 svc_sock_reclen(svsk));
952 svsk->sk_tcplen = 0;
953 svsk->sk_reclen = 0;
954 }
955
956 /*
957 * Receive data from a TCP socket.
958 */
959 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
960 {
961 struct svc_sock *svsk =
962 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
963 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
964 int len;
965 struct kvec *vec;
966 unsigned int want, base;
967 __be32 *p;
968 __be32 calldir;
969 int pnum;
970
971 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
972 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
973 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
974 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
975
976 len = svc_tcp_recv_record(svsk, rqstp);
977 if (len < 0)
978 goto error;
979
980 base = svc_tcp_restore_pages(svsk, rqstp);
981 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
982
983 vec = rqstp->rq_vec;
984
985 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want);
986
987 rqstp->rq_respages = &rqstp->rq_pages[pnum];
988 rqstp->rq_next_page = rqstp->rq_respages + 1;
989
990 /* Now receive data */
991 len = svc_recvfrom(rqstp, vec, pnum, base + want, base);
992 if (len >= 0) {
993 svsk->sk_tcplen += len;
994 svsk->sk_datalen += len;
995 }
996 if (len != want || !svc_sock_final_rec(svsk)) {
997 svc_tcp_save_pages(svsk, rqstp);
998 if (len < 0 && len != -EAGAIN)
999 goto err_delete;
1000 if (len == want)
1001 svc_tcp_fragment_received(svsk);
1002 else
1003 dprintk("svc: incomplete TCP record (%d of %d)\n",
1004 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1005 svc_sock_reclen(svsk));
1006 goto err_noclose;
1007 }
1008
1009 if (svsk->sk_datalen < 8) {
1010 svsk->sk_datalen = 0;
1011 goto err_delete; /* client is nuts. */
1012 }
1013
1014 rqstp->rq_arg.len = svsk->sk_datalen;
1015 rqstp->rq_arg.page_base = 0;
1016 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1017 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1018 rqstp->rq_arg.page_len = 0;
1019 } else
1020 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1021
1022 rqstp->rq_xprt_ctxt = NULL;
1023 rqstp->rq_prot = IPPROTO_TCP;
1024 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1025 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1026 else
1027 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1028
1029 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1030 calldir = p[1];
1031 if (calldir)
1032 len = receive_cb_reply(svsk, rqstp);
1033
1034 /* Reset TCP read info */
1035 svsk->sk_datalen = 0;
1036 svc_tcp_fragment_received(svsk);
1037
1038 if (len < 0)
1039 goto error;
1040
1041 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1042 if (serv->sv_stats)
1043 serv->sv_stats->nettcpcnt++;
1044
1045 return rqstp->rq_arg.len;
1046
1047 error:
1048 if (len != -EAGAIN)
1049 goto err_delete;
1050 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1051 return 0;
1052 err_delete:
1053 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1054 svsk->sk_xprt.xpt_server->sv_name, -len);
1055 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1056 err_noclose:
1057 return 0; /* record not complete */
1058 }
1059
1060 /**
1061 * svc_tcp_sendto - Send out a reply on a TCP socket
1062 * @rqstp: completed svc_rqst
1063 *
1064 * Returns the number of bytes sent, or a negative errno.
1065 */
1066 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1067 {
1068 struct svc_xprt *xprt = rqstp->rq_xprt;
1069 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1070 struct xdr_buf *xdr = &rqstp->rq_res;
1071 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
1072 (u32)xdr->len);
1073 struct msghdr msg = {
1074 .msg_flags = 0,
1075 };
1076 unsigned int uninitialized_var(sent);
1077 int err;
1078
1079 err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, marker, &sent);
1080 xdr_free_bvec(xdr);
1081 if (err < 0 || sent != (xdr->len + sizeof(marker)))
1082 goto out_close;
1083 return sent;
1084
1085 out_close:
1086 pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
1087 xprt->xpt_server->sv_name,
1088 (err < 0) ? "got error" : "sent",
1089 (err < 0) ? err : sent, xdr->len);
1090 set_bit(XPT_CLOSE, &xprt->xpt_flags);
1091 svc_xprt_enqueue(xprt);
1092 return -EAGAIN;
1093 }
1094
1095 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1096 struct net *net,
1097 struct sockaddr *sa, int salen,
1098 int flags)
1099 {
1100 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1101 }
1102
1103 static const struct svc_xprt_ops svc_tcp_ops = {
1104 .xpo_create = svc_tcp_create,
1105 .xpo_recvfrom = svc_tcp_recvfrom,
1106 .xpo_sendto = svc_tcp_sendto,
1107 .xpo_read_payload = svc_sock_read_payload,
1108 .xpo_release_rqst = svc_release_skb,
1109 .xpo_detach = svc_tcp_sock_detach,
1110 .xpo_free = svc_sock_free,
1111 .xpo_has_wspace = svc_tcp_has_wspace,
1112 .xpo_accept = svc_tcp_accept,
1113 .xpo_secure_port = svc_sock_secure_port,
1114 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1115 };
1116
1117 static struct svc_xprt_class svc_tcp_class = {
1118 .xcl_name = "tcp",
1119 .xcl_owner = THIS_MODULE,
1120 .xcl_ops = &svc_tcp_ops,
1121 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1122 .xcl_ident = XPRT_TRANSPORT_TCP,
1123 };
1124
1125 void svc_init_xprt_sock(void)
1126 {
1127 svc_reg_xprt_class(&svc_tcp_class);
1128 svc_reg_xprt_class(&svc_udp_class);
1129 }
1130
1131 void svc_cleanup_xprt_sock(void)
1132 {
1133 svc_unreg_xprt_class(&svc_tcp_class);
1134 svc_unreg_xprt_class(&svc_udp_class);
1135 }
1136
1137 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1138 {
1139 struct sock *sk = svsk->sk_sk;
1140
1141 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1142 &svsk->sk_xprt, serv);
1143 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1144 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1145 if (sk->sk_state == TCP_LISTEN) {
1146 dprintk("setting up TCP socket for listening\n");
1147 strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
1148 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1149 sk->sk_data_ready = svc_tcp_listen_data_ready;
1150 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1151 } else {
1152 dprintk("setting up TCP socket for reading\n");
1153 sk->sk_state_change = svc_tcp_state_change;
1154 sk->sk_data_ready = svc_data_ready;
1155 sk->sk_write_space = svc_write_space;
1156
1157 svsk->sk_reclen = 0;
1158 svsk->sk_tcplen = 0;
1159 svsk->sk_datalen = 0;
1160 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1161
1162 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1163
1164 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1165 switch (sk->sk_state) {
1166 case TCP_SYN_RECV:
1167 case TCP_ESTABLISHED:
1168 break;
1169 default:
1170 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1171 }
1172 }
1173 }
1174
1175 void svc_sock_update_bufs(struct svc_serv *serv)
1176 {
1177 /*
1178 * The number of server threads has changed. Update
1179 * rcvbuf and sndbuf accordingly on all sockets
1180 */
1181 struct svc_sock *svsk;
1182
1183 spin_lock_bh(&serv->sv_lock);
1184 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1185 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1186 spin_unlock_bh(&serv->sv_lock);
1187 }
1188 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1189
1190 /*
1191 * Initialize socket for RPC use and create svc_sock struct
1192 */
1193 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1194 struct socket *sock,
1195 int flags)
1196 {
1197 struct svc_sock *svsk;
1198 struct sock *inet;
1199 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1200 int err = 0;
1201
1202 dprintk("svc: svc_setup_socket %p\n", sock);
1203 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1204 if (!svsk)
1205 return ERR_PTR(-ENOMEM);
1206
1207 inet = sock->sk;
1208
1209 /* Register socket with portmapper */
1210 if (pmap_register)
1211 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1212 inet->sk_protocol,
1213 ntohs(inet_sk(inet)->inet_sport));
1214
1215 if (err < 0) {
1216 kfree(svsk);
1217 return ERR_PTR(err);
1218 }
1219
1220 svsk->sk_sock = sock;
1221 svsk->sk_sk = inet;
1222 svsk->sk_ostate = inet->sk_state_change;
1223 svsk->sk_odata = inet->sk_data_ready;
1224 svsk->sk_owspace = inet->sk_write_space;
1225 /*
1226 * This barrier is necessary in order to prevent race condition
1227 * with svc_data_ready(), svc_listen_data_ready() and others
1228 * when calling callbacks above.
1229 */
1230 wmb();
1231 inet->sk_user_data = svsk;
1232
1233 /* Initialize the socket */
1234 if (sock->type == SOCK_DGRAM)
1235 svc_udp_init(svsk, serv);
1236 else
1237 svc_tcp_init(svsk, serv);
1238
1239 dprintk("svc: svc_setup_socket created %p (inet %p), "
1240 "listen %d close %d\n",
1241 svsk, svsk->sk_sk,
1242 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1243 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1244
1245 return svsk;
1246 }
1247
1248 bool svc_alien_sock(struct net *net, int fd)
1249 {
1250 int err;
1251 struct socket *sock = sockfd_lookup(fd, &err);
1252 bool ret = false;
1253
1254 if (!sock)
1255 goto out;
1256 if (sock_net(sock->sk) != net)
1257 ret = true;
1258 sockfd_put(sock);
1259 out:
1260 return ret;
1261 }
1262 EXPORT_SYMBOL_GPL(svc_alien_sock);
1263
1264 /**
1265 * svc_addsock - add a listener socket to an RPC service
1266 * @serv: pointer to RPC service to which to add a new listener
1267 * @fd: file descriptor of the new listener
1268 * @name_return: pointer to buffer to fill in with name of listener
1269 * @len: size of the buffer
1270 * @cred: credential
1271 *
1272 * Fills in socket name and returns positive length of name if successful.
1273 * Name is terminated with '\n'. On error, returns a negative errno
1274 * value.
1275 */
1276 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1277 const size_t len, const struct cred *cred)
1278 {
1279 int err = 0;
1280 struct socket *so = sockfd_lookup(fd, &err);
1281 struct svc_sock *svsk = NULL;
1282 struct sockaddr_storage addr;
1283 struct sockaddr *sin = (struct sockaddr *)&addr;
1284 int salen;
1285
1286 if (!so)
1287 return err;
1288 err = -EAFNOSUPPORT;
1289 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1290 goto out;
1291 err = -EPROTONOSUPPORT;
1292 if (so->sk->sk_protocol != IPPROTO_TCP &&
1293 so->sk->sk_protocol != IPPROTO_UDP)
1294 goto out;
1295 err = -EISCONN;
1296 if (so->state > SS_UNCONNECTED)
1297 goto out;
1298 err = -ENOENT;
1299 if (!try_module_get(THIS_MODULE))
1300 goto out;
1301 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1302 if (IS_ERR(svsk)) {
1303 module_put(THIS_MODULE);
1304 err = PTR_ERR(svsk);
1305 goto out;
1306 }
1307 salen = kernel_getsockname(svsk->sk_sock, sin);
1308 if (salen >= 0)
1309 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1310 svsk->sk_xprt.xpt_cred = get_cred(cred);
1311 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1312 return svc_one_sock_name(svsk, name_return, len);
1313 out:
1314 sockfd_put(so);
1315 return err;
1316 }
1317 EXPORT_SYMBOL_GPL(svc_addsock);
1318
1319 /*
1320 * Create socket for RPC service.
1321 */
1322 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1323 int protocol,
1324 struct net *net,
1325 struct sockaddr *sin, int len,
1326 int flags)
1327 {
1328 struct svc_sock *svsk;
1329 struct socket *sock;
1330 int error;
1331 int type;
1332 struct sockaddr_storage addr;
1333 struct sockaddr *newsin = (struct sockaddr *)&addr;
1334 int newlen;
1335 int family;
1336 int val;
1337 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1338
1339 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1340 serv->sv_program->pg_name, protocol,
1341 __svc_print_addr(sin, buf, sizeof(buf)));
1342
1343 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1344 printk(KERN_WARNING "svc: only UDP and TCP "
1345 "sockets supported\n");
1346 return ERR_PTR(-EINVAL);
1347 }
1348
1349 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1350 switch (sin->sa_family) {
1351 case AF_INET6:
1352 family = PF_INET6;
1353 break;
1354 case AF_INET:
1355 family = PF_INET;
1356 break;
1357 default:
1358 return ERR_PTR(-EINVAL);
1359 }
1360
1361 error = __sock_create(net, family, type, protocol, &sock, 1);
1362 if (error < 0)
1363 return ERR_PTR(error);
1364
1365 svc_reclassify_socket(sock);
1366
1367 /*
1368 * If this is an PF_INET6 listener, we want to avoid
1369 * getting requests from IPv4 remotes. Those should
1370 * be shunted to a PF_INET listener via rpcbind.
1371 */
1372 val = 1;
1373 if (family == PF_INET6)
1374 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1375 (char *)&val, sizeof(val));
1376
1377 if (type == SOCK_STREAM)
1378 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1379 error = kernel_bind(sock, sin, len);
1380 if (error < 0)
1381 goto bummer;
1382
1383 error = kernel_getsockname(sock, newsin);
1384 if (error < 0)
1385 goto bummer;
1386 newlen = error;
1387
1388 if (protocol == IPPROTO_TCP) {
1389 if ((error = kernel_listen(sock, 64)) < 0)
1390 goto bummer;
1391 }
1392
1393 svsk = svc_setup_socket(serv, sock, flags);
1394 if (IS_ERR(svsk)) {
1395 error = PTR_ERR(svsk);
1396 goto bummer;
1397 }
1398 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1399 return (struct svc_xprt *)svsk;
1400 bummer:
1401 dprintk("svc: svc_create_socket error = %d\n", -error);
1402 sock_release(sock);
1403 return ERR_PTR(error);
1404 }
1405
1406 /*
1407 * Detach the svc_sock from the socket so that no
1408 * more callbacks occur.
1409 */
1410 static void svc_sock_detach(struct svc_xprt *xprt)
1411 {
1412 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1413 struct sock *sk = svsk->sk_sk;
1414
1415 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1416
1417 /* put back the old socket callbacks */
1418 lock_sock(sk);
1419 sk->sk_state_change = svsk->sk_ostate;
1420 sk->sk_data_ready = svsk->sk_odata;
1421 sk->sk_write_space = svsk->sk_owspace;
1422 sk->sk_user_data = NULL;
1423 release_sock(sk);
1424 }
1425
1426 /*
1427 * Disconnect the socket, and reset the callbacks
1428 */
1429 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1430 {
1431 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1432
1433 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1434
1435 svc_sock_detach(xprt);
1436
1437 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1438 svc_tcp_clear_pages(svsk);
1439 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1440 }
1441 }
1442
1443 /*
1444 * Free the svc_sock's socket resources and the svc_sock itself.
1445 */
1446 static void svc_sock_free(struct svc_xprt *xprt)
1447 {
1448 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1449 dprintk("svc: svc_sock_free(%p)\n", svsk);
1450
1451 if (svsk->sk_sock->file)
1452 sockfd_put(svsk->sk_sock);
1453 else
1454 sock_release(svsk->sk_sock);
1455 kfree(svsk);
1456 }
Linux with added FPC-III support