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Merge tag 'spi-v3.11-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
[deliverable/linux.git] / net / sunrpc / svcsock.c
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 case PF_INET6:
295 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
296 proto_name,
297 &inet6_sk(sk)->rcv_saddr,
298 inet_sk(sk)->inet_num);
299 break;
300 default:
301 len = snprintf(buf, remaining, "*unknown-%d*\n",
302 sk->sk_family);
303 }
304
305 if (len >= remaining) {
306 *buf = '\0';
307 return -ENAMETOOLONG;
308 }
309 return len;
310 }
311
312 /*
313 * Check input queue length
314 */
315 static int svc_recv_available(struct svc_sock *svsk)
316 {
317 struct socket *sock = svsk->sk_sock;
318 int avail, err;
319
320 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
321
322 return (err >= 0)? avail : err;
323 }
324
325 /*
326 * Generic recvfrom routine.
327 */
328 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
329 int buflen)
330 {
331 struct svc_sock *svsk =
332 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
333 struct msghdr msg = {
334 .msg_flags = MSG_DONTWAIT,
335 };
336 int len;
337
338 rqstp->rq_xprt_hlen = 0;
339
340 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
341 msg.msg_flags);
342
343 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
344 svsk, iov[0].iov_base, iov[0].iov_len, len);
345 return len;
346 }
347
348 static int svc_partial_recvfrom(struct svc_rqst *rqstp,
349 struct kvec *iov, int nr,
350 int buflen, unsigned int base)
351 {
352 size_t save_iovlen;
353 void *save_iovbase;
354 unsigned int i;
355 int ret;
356
357 if (base == 0)
358 return svc_recvfrom(rqstp, iov, nr, buflen);
359
360 for (i = 0; i < nr; i++) {
361 if (iov[i].iov_len > base)
362 break;
363 base -= iov[i].iov_len;
364 }
365 save_iovlen = iov[i].iov_len;
366 save_iovbase = iov[i].iov_base;
367 iov[i].iov_len -= base;
368 iov[i].iov_base += base;
369 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
370 iov[i].iov_len = save_iovlen;
371 iov[i].iov_base = save_iovbase;
372 return ret;
373 }
374
375 /*
376 * Set socket snd and rcv buffer lengths
377 */
378 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
379 unsigned int rcv)
380 {
381 #if 0
382 mm_segment_t oldfs;
383 oldfs = get_fs(); set_fs(KERNEL_DS);
384 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
385 (char*)&snd, sizeof(snd));
386 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
387 (char*)&rcv, sizeof(rcv));
388 #else
389 /* sock_setsockopt limits use to sysctl_?mem_max,
390 * which isn't acceptable. Until that is made conditional
391 * on not having CAP_SYS_RESOURCE or similar, we go direct...
392 * DaveM said I could!
393 */
394 lock_sock(sock->sk);
395 sock->sk->sk_sndbuf = snd * 2;
396 sock->sk->sk_rcvbuf = rcv * 2;
397 sock->sk->sk_write_space(sock->sk);
398 release_sock(sock->sk);
399 #endif
400 }
401 /*
402 * INET callback when data has been received on the socket.
403 */
404 static void svc_udp_data_ready(struct sock *sk, int count)
405 {
406 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
407 wait_queue_head_t *wq = sk_sleep(sk);
408
409 if (svsk) {
410 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
411 svsk, sk, count,
412 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
413 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
414 svc_xprt_enqueue(&svsk->sk_xprt);
415 }
416 if (wq && waitqueue_active(wq))
417 wake_up_interruptible(wq);
418 }
419
420 /*
421 * INET callback when space is newly available on the socket.
422 */
423 static void svc_write_space(struct sock *sk)
424 {
425 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
426 wait_queue_head_t *wq = sk_sleep(sk);
427
428 if (svsk) {
429 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
430 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
431 svc_xprt_enqueue(&svsk->sk_xprt);
432 }
433
434 if (wq && waitqueue_active(wq)) {
435 dprintk("RPC svc_write_space: someone sleeping on %p\n",
436 svsk);
437 wake_up_interruptible(wq);
438 }
439 }
440
441 static void svc_tcp_write_space(struct sock *sk)
442 {
443 struct socket *sock = sk->sk_socket;
444
445 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
446 clear_bit(SOCK_NOSPACE, &sock->flags);
447 svc_write_space(sk);
448 }
449
450 /*
451 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
452 */
453 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
454 struct cmsghdr *cmh)
455 {
456 struct in_pktinfo *pki = CMSG_DATA(cmh);
457 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
458
459 if (cmh->cmsg_type != IP_PKTINFO)
460 return 0;
461
462 daddr->sin_family = AF_INET;
463 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
464 return 1;
465 }
466
467 /*
468 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
469 */
470 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
471 struct cmsghdr *cmh)
472 {
473 struct in6_pktinfo *pki = CMSG_DATA(cmh);
474 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
475
476 if (cmh->cmsg_type != IPV6_PKTINFO)
477 return 0;
478
479 daddr->sin6_family = AF_INET6;
480 daddr->sin6_addr = pki->ipi6_addr;
481 daddr->sin6_scope_id = pki->ipi6_ifindex;
482 return 1;
483 }
484
485 /*
486 * Copy the UDP datagram's destination address to the rqstp structure.
487 * The 'destination' address in this case is the address to which the
488 * peer sent the datagram, i.e. our local address. For multihomed
489 * hosts, this can change from msg to msg. Note that only the IP
490 * address changes, the port number should remain the same.
491 */
492 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
493 struct cmsghdr *cmh)
494 {
495 switch (cmh->cmsg_level) {
496 case SOL_IP:
497 return svc_udp_get_dest_address4(rqstp, cmh);
498 case SOL_IPV6:
499 return svc_udp_get_dest_address6(rqstp, cmh);
500 }
501
502 return 0;
503 }
504
505 /*
506 * Receive a datagram from a UDP socket.
507 */
508 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
509 {
510 struct svc_sock *svsk =
511 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
512 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
513 struct sk_buff *skb;
514 union {
515 struct cmsghdr hdr;
516 long all[SVC_PKTINFO_SPACE / sizeof(long)];
517 } buffer;
518 struct cmsghdr *cmh = &buffer.hdr;
519 struct msghdr msg = {
520 .msg_name = svc_addr(rqstp),
521 .msg_control = cmh,
522 .msg_controllen = sizeof(buffer),
523 .msg_flags = MSG_DONTWAIT,
524 };
525 size_t len;
526 int err;
527
528 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
529 /* udp sockets need large rcvbuf as all pending
530 * requests are still in that buffer. sndbuf must
531 * also be large enough that there is enough space
532 * for one reply per thread. We count all threads
533 * rather than threads in a particular pool, which
534 * provides an upper bound on the number of threads
535 * which will access the socket.
536 */
537 svc_sock_setbufsize(svsk->sk_sock,
538 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
539 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
540
541 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
542 skb = NULL;
543 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
544 0, 0, MSG_PEEK | MSG_DONTWAIT);
545 if (err >= 0)
546 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
547
548 if (skb == NULL) {
549 if (err != -EAGAIN) {
550 /* possibly an icmp error */
551 dprintk("svc: recvfrom returned error %d\n", -err);
552 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
553 }
554 return 0;
555 }
556 len = svc_addr_len(svc_addr(rqstp));
557 rqstp->rq_addrlen = len;
558 if (skb->tstamp.tv64 == 0) {
559 skb->tstamp = ktime_get_real();
560 /* Don't enable netstamp, sunrpc doesn't
561 need that much accuracy */
562 }
563 svsk->sk_sk->sk_stamp = skb->tstamp;
564 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
565
566 len = skb->len - sizeof(struct udphdr);
567 rqstp->rq_arg.len = len;
568
569 rqstp->rq_prot = IPPROTO_UDP;
570
571 if (!svc_udp_get_dest_address(rqstp, cmh)) {
572 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
573 cmh->cmsg_level, cmh->cmsg_type);
574 goto out_free;
575 }
576 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
577
578 if (skb_is_nonlinear(skb)) {
579 /* we have to copy */
580 local_bh_disable();
581 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
582 local_bh_enable();
583 /* checksum error */
584 goto out_free;
585 }
586 local_bh_enable();
587 skb_free_datagram_locked(svsk->sk_sk, skb);
588 } else {
589 /* we can use it in-place */
590 rqstp->rq_arg.head[0].iov_base = skb->data +
591 sizeof(struct udphdr);
592 rqstp->rq_arg.head[0].iov_len = len;
593 if (skb_checksum_complete(skb))
594 goto out_free;
595 rqstp->rq_xprt_ctxt = skb;
596 }
597
598 rqstp->rq_arg.page_base = 0;
599 if (len <= rqstp->rq_arg.head[0].iov_len) {
600 rqstp->rq_arg.head[0].iov_len = len;
601 rqstp->rq_arg.page_len = 0;
602 rqstp->rq_respages = rqstp->rq_pages+1;
603 } else {
604 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
605 rqstp->rq_respages = rqstp->rq_pages + 1 +
606 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
607 }
608 rqstp->rq_next_page = rqstp->rq_respages+1;
609
610 if (serv->sv_stats)
611 serv->sv_stats->netudpcnt++;
612
613 return len;
614 out_free:
615 trace_kfree_skb(skb, svc_udp_recvfrom);
616 skb_free_datagram_locked(svsk->sk_sk, skb);
617 return 0;
618 }
619
620 static int
621 svc_udp_sendto(struct svc_rqst *rqstp)
622 {
623 int error;
624
625 error = svc_sendto(rqstp, &rqstp->rq_res);
626 if (error == -ECONNREFUSED)
627 /* ICMP error on earlier request. */
628 error = svc_sendto(rqstp, &rqstp->rq_res);
629
630 return error;
631 }
632
633 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
634 {
635 }
636
637 static int svc_udp_has_wspace(struct svc_xprt *xprt)
638 {
639 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
640 struct svc_serv *serv = xprt->xpt_server;
641 unsigned long required;
642
643 /*
644 * Set the SOCK_NOSPACE flag before checking the available
645 * sock space.
646 */
647 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
648 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
649 if (required*2 > sock_wspace(svsk->sk_sk))
650 return 0;
651 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
652 return 1;
653 }
654
655 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
656 {
657 BUG();
658 return NULL;
659 }
660
661 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
662 struct net *net,
663 struct sockaddr *sa, int salen,
664 int flags)
665 {
666 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
667 }
668
669 static struct svc_xprt_ops svc_udp_ops = {
670 .xpo_create = svc_udp_create,
671 .xpo_recvfrom = svc_udp_recvfrom,
672 .xpo_sendto = svc_udp_sendto,
673 .xpo_release_rqst = svc_release_skb,
674 .xpo_detach = svc_sock_detach,
675 .xpo_free = svc_sock_free,
676 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
677 .xpo_has_wspace = svc_udp_has_wspace,
678 .xpo_accept = svc_udp_accept,
679 };
680
681 static struct svc_xprt_class svc_udp_class = {
682 .xcl_name = "udp",
683 .xcl_owner = THIS_MODULE,
684 .xcl_ops = &svc_udp_ops,
685 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
686 };
687
688 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
689 {
690 int err, level, optname, one = 1;
691
692 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
693 &svsk->sk_xprt, serv);
694 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
695 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
696 svsk->sk_sk->sk_write_space = svc_write_space;
697
698 /* initialise setting must have enough space to
699 * receive and respond to one request.
700 * svc_udp_recvfrom will re-adjust if necessary
701 */
702 svc_sock_setbufsize(svsk->sk_sock,
703 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
704 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
705
706 /* data might have come in before data_ready set up */
707 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
708 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
709
710 /* make sure we get destination address info */
711 switch (svsk->sk_sk->sk_family) {
712 case AF_INET:
713 level = SOL_IP;
714 optname = IP_PKTINFO;
715 break;
716 case AF_INET6:
717 level = SOL_IPV6;
718 optname = IPV6_RECVPKTINFO;
719 break;
720 default:
721 BUG();
722 }
723 err = kernel_setsockopt(svsk->sk_sock, level, optname,
724 (char *)&one, sizeof(one));
725 dprintk("svc: kernel_setsockopt returned %d\n", err);
726 }
727
728 /*
729 * A data_ready event on a listening socket means there's a connection
730 * pending. Do not use state_change as a substitute for it.
731 */
732 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
733 {
734 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
735 wait_queue_head_t *wq;
736
737 dprintk("svc: socket %p TCP (listen) state change %d\n",
738 sk, sk->sk_state);
739
740 /*
741 * This callback may called twice when a new connection
742 * is established as a child socket inherits everything
743 * from a parent LISTEN socket.
744 * 1) data_ready method of the parent socket will be called
745 * when one of child sockets become ESTABLISHED.
746 * 2) data_ready method of the child socket may be called
747 * when it receives data before the socket is accepted.
748 * In case of 2, we should ignore it silently.
749 */
750 if (sk->sk_state == TCP_LISTEN) {
751 if (svsk) {
752 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
753 svc_xprt_enqueue(&svsk->sk_xprt);
754 } else
755 printk("svc: socket %p: no user data\n", sk);
756 }
757
758 wq = sk_sleep(sk);
759 if (wq && waitqueue_active(wq))
760 wake_up_interruptible_all(wq);
761 }
762
763 /*
764 * A state change on a connected socket means it's dying or dead.
765 */
766 static void svc_tcp_state_change(struct sock *sk)
767 {
768 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
769 wait_queue_head_t *wq = sk_sleep(sk);
770
771 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
772 sk, sk->sk_state, sk->sk_user_data);
773
774 if (!svsk)
775 printk("svc: socket %p: no user data\n", sk);
776 else {
777 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
778 svc_xprt_enqueue(&svsk->sk_xprt);
779 }
780 if (wq && waitqueue_active(wq))
781 wake_up_interruptible_all(wq);
782 }
783
784 static void svc_tcp_data_ready(struct sock *sk, int count)
785 {
786 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
787 wait_queue_head_t *wq = sk_sleep(sk);
788
789 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
790 sk, sk->sk_user_data);
791 if (svsk) {
792 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
793 svc_xprt_enqueue(&svsk->sk_xprt);
794 }
795 if (wq && waitqueue_active(wq))
796 wake_up_interruptible(wq);
797 }
798
799 /*
800 * Accept a TCP connection
801 */
802 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
803 {
804 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
805 struct sockaddr_storage addr;
806 struct sockaddr *sin = (struct sockaddr *) &addr;
807 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
808 struct socket *sock = svsk->sk_sock;
809 struct socket *newsock;
810 struct svc_sock *newsvsk;
811 int err, slen;
812 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
813
814 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
815 if (!sock)
816 return NULL;
817
818 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
819 err = kernel_accept(sock, &newsock, O_NONBLOCK);
820 if (err < 0) {
821 if (err == -ENOMEM)
822 printk(KERN_WARNING "%s: no more sockets!\n",
823 serv->sv_name);
824 else if (err != -EAGAIN)
825 net_warn_ratelimited("%s: accept failed (err %d)!\n",
826 serv->sv_name, -err);
827 return NULL;
828 }
829 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
830
831 err = kernel_getpeername(newsock, sin, &slen);
832 if (err < 0) {
833 net_warn_ratelimited("%s: peername failed (err %d)!\n",
834 serv->sv_name, -err);
835 goto failed; /* aborted connection or whatever */
836 }
837
838 /* Ideally, we would want to reject connections from unauthorized
839 * hosts here, but when we get encryption, the IP of the host won't
840 * tell us anything. For now just warn about unpriv connections.
841 */
842 if (!svc_port_is_privileged(sin)) {
843 dprintk(KERN_WARNING
844 "%s: connect from unprivileged port: %s\n",
845 serv->sv_name,
846 __svc_print_addr(sin, buf, sizeof(buf)));
847 }
848 dprintk("%s: connect from %s\n", serv->sv_name,
849 __svc_print_addr(sin, buf, sizeof(buf)));
850
851 /* make sure that a write doesn't block forever when
852 * low on memory
853 */
854 newsock->sk->sk_sndtimeo = HZ*30;
855
856 newsvsk = svc_setup_socket(serv, newsock,
857 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
858 if (IS_ERR(newsvsk))
859 goto failed;
860 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
861 err = kernel_getsockname(newsock, sin, &slen);
862 if (unlikely(err < 0)) {
863 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
864 slen = offsetof(struct sockaddr, sa_data);
865 }
866 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
867
868 if (serv->sv_stats)
869 serv->sv_stats->nettcpconn++;
870
871 return &newsvsk->sk_xprt;
872
873 failed:
874 sock_release(newsock);
875 return NULL;
876 }
877
878 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
879 {
880 unsigned int i, len, npages;
881
882 if (svsk->sk_datalen == 0)
883 return 0;
884 len = svsk->sk_datalen;
885 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
886 for (i = 0; i < npages; i++) {
887 if (rqstp->rq_pages[i] != NULL)
888 put_page(rqstp->rq_pages[i]);
889 BUG_ON(svsk->sk_pages[i] == NULL);
890 rqstp->rq_pages[i] = svsk->sk_pages[i];
891 svsk->sk_pages[i] = NULL;
892 }
893 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
894 return len;
895 }
896
897 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
898 {
899 unsigned int i, len, npages;
900
901 if (svsk->sk_datalen == 0)
902 return;
903 len = svsk->sk_datalen;
904 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
905 for (i = 0; i < npages; i++) {
906 svsk->sk_pages[i] = rqstp->rq_pages[i];
907 rqstp->rq_pages[i] = NULL;
908 }
909 }
910
911 static void svc_tcp_clear_pages(struct svc_sock *svsk)
912 {
913 unsigned int i, len, npages;
914
915 if (svsk->sk_datalen == 0)
916 goto out;
917 len = svsk->sk_datalen;
918 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
919 for (i = 0; i < npages; i++) {
920 if (svsk->sk_pages[i] == NULL) {
921 WARN_ON_ONCE(1);
922 continue;
923 }
924 put_page(svsk->sk_pages[i]);
925 svsk->sk_pages[i] = NULL;
926 }
927 out:
928 svsk->sk_tcplen = 0;
929 svsk->sk_datalen = 0;
930 }
931
932 /*
933 * Receive fragment record header.
934 * If we haven't gotten the record length yet, get the next four bytes.
935 */
936 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
937 {
938 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
939 unsigned int want;
940 int len;
941
942 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
943
944 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
945 struct kvec iov;
946
947 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
948 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
949 iov.iov_len = want;
950 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
951 goto error;
952 svsk->sk_tcplen += len;
953
954 if (len < want) {
955 dprintk("svc: short recvfrom while reading record "
956 "length (%d of %d)\n", len, want);
957 return -EAGAIN;
958 }
959
960 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
961 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
962 serv->sv_max_mesg) {
963 net_notice_ratelimited("RPC: fragment too large: %d\n",
964 svc_sock_reclen(svsk));
965 goto err_delete;
966 }
967 }
968
969 return svc_sock_reclen(svsk);
970 error:
971 dprintk("RPC: TCP recv_record got %d\n", len);
972 return len;
973 err_delete:
974 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
975 return -EAGAIN;
976 }
977
978 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
979 {
980 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
981 struct rpc_rqst *req = NULL;
982 struct kvec *src, *dst;
983 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
984 __be32 xid;
985 __be32 calldir;
986
987 xid = *p++;
988 calldir = *p;
989
990 if (bc_xprt)
991 req = xprt_lookup_rqst(bc_xprt, xid);
992
993 if (!req) {
994 printk(KERN_NOTICE
995 "%s: Got unrecognized reply: "
996 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
997 __func__, ntohl(calldir),
998 bc_xprt, xid);
999 return -EAGAIN;
1000 }
1001
1002 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1003 /*
1004 * XXX!: cheating for now! Only copying HEAD.
1005 * But we know this is good enough for now (in fact, for any
1006 * callback reply in the forseeable future).
1007 */
1008 dst = &req->rq_private_buf.head[0];
1009 src = &rqstp->rq_arg.head[0];
1010 if (dst->iov_len < src->iov_len)
1011 return -EAGAIN; /* whatever; just giving up. */
1012 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1013 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1014 rqstp->rq_arg.len = 0;
1015 return 0;
1016 }
1017
1018 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1019 {
1020 int i = 0;
1021 int t = 0;
1022
1023 while (t < len) {
1024 vec[i].iov_base = page_address(pages[i]);
1025 vec[i].iov_len = PAGE_SIZE;
1026 i++;
1027 t += PAGE_SIZE;
1028 }
1029 return i;
1030 }
1031
1032 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1033 {
1034 /* If we have more data, signal svc_xprt_enqueue() to try again */
1035 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1036 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1037 dprintk("svc: TCP %s record (%d bytes)\n",
1038 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1039 svc_sock_reclen(svsk));
1040 svsk->sk_tcplen = 0;
1041 svsk->sk_reclen = 0;
1042 }
1043
1044 /*
1045 * Receive data from a TCP socket.
1046 */
1047 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1048 {
1049 struct svc_sock *svsk =
1050 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1051 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1052 int len;
1053 struct kvec *vec;
1054 unsigned int want, base;
1055 __be32 *p;
1056 __be32 calldir;
1057 int pnum;
1058
1059 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1060 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1061 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1062 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1063
1064 len = svc_tcp_recv_record(svsk, rqstp);
1065 if (len < 0)
1066 goto error;
1067
1068 base = svc_tcp_restore_pages(svsk, rqstp);
1069 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1070
1071 vec = rqstp->rq_vec;
1072
1073 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1074 svsk->sk_datalen + want);
1075
1076 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1077 rqstp->rq_next_page = rqstp->rq_respages + 1;
1078
1079 /* Now receive data */
1080 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1081 if (len >= 0) {
1082 svsk->sk_tcplen += len;
1083 svsk->sk_datalen += len;
1084 }
1085 if (len != want || !svc_sock_final_rec(svsk)) {
1086 svc_tcp_save_pages(svsk, rqstp);
1087 if (len < 0 && len != -EAGAIN)
1088 goto err_delete;
1089 if (len == want)
1090 svc_tcp_fragment_received(svsk);
1091 else
1092 dprintk("svc: incomplete TCP record (%d of %d)\n",
1093 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1094 svc_sock_reclen(svsk));
1095 goto err_noclose;
1096 }
1097
1098 if (svsk->sk_datalen < 8) {
1099 svsk->sk_datalen = 0;
1100 goto err_delete; /* client is nuts. */
1101 }
1102
1103 rqstp->rq_arg.len = svsk->sk_datalen;
1104 rqstp->rq_arg.page_base = 0;
1105 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1106 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1107 rqstp->rq_arg.page_len = 0;
1108 } else
1109 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1110
1111 rqstp->rq_xprt_ctxt = NULL;
1112 rqstp->rq_prot = IPPROTO_TCP;
1113
1114 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1115 calldir = p[1];
1116 if (calldir)
1117 len = receive_cb_reply(svsk, rqstp);
1118
1119 /* Reset TCP read info */
1120 svsk->sk_datalen = 0;
1121 svc_tcp_fragment_received(svsk);
1122
1123 if (len < 0)
1124 goto error;
1125
1126 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1127 if (serv->sv_stats)
1128 serv->sv_stats->nettcpcnt++;
1129
1130 return rqstp->rq_arg.len;
1131
1132 error:
1133 if (len != -EAGAIN)
1134 goto err_delete;
1135 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1136 return 0;
1137 err_delete:
1138 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1139 svsk->sk_xprt.xpt_server->sv_name, -len);
1140 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1141 err_noclose:
1142 return 0; /* record not complete */
1143 }
1144
1145 /*
1146 * Send out data on TCP socket.
1147 */
1148 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1149 {
1150 struct xdr_buf *xbufp = &rqstp->rq_res;
1151 int sent;
1152 __be32 reclen;
1153
1154 /* Set up the first element of the reply kvec.
1155 * Any other kvecs that may be in use have been taken
1156 * care of by the server implementation itself.
1157 */
1158 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1159 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1160
1161 sent = svc_sendto(rqstp, &rqstp->rq_res);
1162 if (sent != xbufp->len) {
1163 printk(KERN_NOTICE
1164 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1165 "- shutting down socket\n",
1166 rqstp->rq_xprt->xpt_server->sv_name,
1167 (sent<0)?"got error":"sent only",
1168 sent, xbufp->len);
1169 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1170 svc_xprt_enqueue(rqstp->rq_xprt);
1171 sent = -EAGAIN;
1172 }
1173 return sent;
1174 }
1175
1176 /*
1177 * Setup response header. TCP has a 4B record length field.
1178 */
1179 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1180 {
1181 struct kvec *resv = &rqstp->rq_res.head[0];
1182
1183 /* tcp needs a space for the record length... */
1184 svc_putnl(resv, 0);
1185 }
1186
1187 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1188 {
1189 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1190 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1191 int required;
1192
1193 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1194 return 1;
1195 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1196 if (sk_stream_wspace(svsk->sk_sk) >= required ||
1197 (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
1198 atomic_read(&xprt->xpt_reserved) == 0))
1199 return 1;
1200 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1201 return 0;
1202 }
1203
1204 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1205 struct net *net,
1206 struct sockaddr *sa, int salen,
1207 int flags)
1208 {
1209 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1210 }
1211
1212 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1213 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1214 struct net *, struct sockaddr *,
1215 int, int);
1216 static void svc_bc_sock_free(struct svc_xprt *xprt);
1217
1218 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1219 struct net *net,
1220 struct sockaddr *sa, int salen,
1221 int flags)
1222 {
1223 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1224 }
1225
1226 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1227 {
1228 }
1229
1230 static struct svc_xprt_ops svc_tcp_bc_ops = {
1231 .xpo_create = svc_bc_tcp_create,
1232 .xpo_detach = svc_bc_tcp_sock_detach,
1233 .xpo_free = svc_bc_sock_free,
1234 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1235 };
1236
1237 static struct svc_xprt_class svc_tcp_bc_class = {
1238 .xcl_name = "tcp-bc",
1239 .xcl_owner = THIS_MODULE,
1240 .xcl_ops = &svc_tcp_bc_ops,
1241 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1242 };
1243
1244 static void svc_init_bc_xprt_sock(void)
1245 {
1246 svc_reg_xprt_class(&svc_tcp_bc_class);
1247 }
1248
1249 static void svc_cleanup_bc_xprt_sock(void)
1250 {
1251 svc_unreg_xprt_class(&svc_tcp_bc_class);
1252 }
1253 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1254 static void svc_init_bc_xprt_sock(void)
1255 {
1256 }
1257
1258 static void svc_cleanup_bc_xprt_sock(void)
1259 {
1260 }
1261 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1262
1263 static struct svc_xprt_ops svc_tcp_ops = {
1264 .xpo_create = svc_tcp_create,
1265 .xpo_recvfrom = svc_tcp_recvfrom,
1266 .xpo_sendto = svc_tcp_sendto,
1267 .xpo_release_rqst = svc_release_skb,
1268 .xpo_detach = svc_tcp_sock_detach,
1269 .xpo_free = svc_sock_free,
1270 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1271 .xpo_has_wspace = svc_tcp_has_wspace,
1272 .xpo_accept = svc_tcp_accept,
1273 };
1274
1275 static struct svc_xprt_class svc_tcp_class = {
1276 .xcl_name = "tcp",
1277 .xcl_owner = THIS_MODULE,
1278 .xcl_ops = &svc_tcp_ops,
1279 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1280 };
1281
1282 void svc_init_xprt_sock(void)
1283 {
1284 svc_reg_xprt_class(&svc_tcp_class);
1285 svc_reg_xprt_class(&svc_udp_class);
1286 svc_init_bc_xprt_sock();
1287 }
1288
1289 void svc_cleanup_xprt_sock(void)
1290 {
1291 svc_unreg_xprt_class(&svc_tcp_class);
1292 svc_unreg_xprt_class(&svc_udp_class);
1293 svc_cleanup_bc_xprt_sock();
1294 }
1295
1296 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1297 {
1298 struct sock *sk = svsk->sk_sk;
1299
1300 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1301 &svsk->sk_xprt, serv);
1302 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1303 if (sk->sk_state == TCP_LISTEN) {
1304 dprintk("setting up TCP socket for listening\n");
1305 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1306 sk->sk_data_ready = svc_tcp_listen_data_ready;
1307 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1308 } else {
1309 dprintk("setting up TCP socket for reading\n");
1310 sk->sk_state_change = svc_tcp_state_change;
1311 sk->sk_data_ready = svc_tcp_data_ready;
1312 sk->sk_write_space = svc_tcp_write_space;
1313
1314 svsk->sk_reclen = 0;
1315 svsk->sk_tcplen = 0;
1316 svsk->sk_datalen = 0;
1317 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1318
1319 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1320
1321 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1322 if (sk->sk_state != TCP_ESTABLISHED)
1323 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1324 }
1325 }
1326
1327 void svc_sock_update_bufs(struct svc_serv *serv)
1328 {
1329 /*
1330 * The number of server threads has changed. Update
1331 * rcvbuf and sndbuf accordingly on all sockets
1332 */
1333 struct svc_sock *svsk;
1334
1335 spin_lock_bh(&serv->sv_lock);
1336 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1337 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1338 spin_unlock_bh(&serv->sv_lock);
1339 }
1340 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1341
1342 /*
1343 * Initialize socket for RPC use and create svc_sock struct
1344 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1345 */
1346 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1347 struct socket *sock,
1348 int flags)
1349 {
1350 struct svc_sock *svsk;
1351 struct sock *inet;
1352 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1353 int err = 0;
1354
1355 dprintk("svc: svc_setup_socket %p\n", sock);
1356 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1357 if (!svsk)
1358 return ERR_PTR(-ENOMEM);
1359
1360 inet = sock->sk;
1361
1362 /* Register socket with portmapper */
1363 if (pmap_register)
1364 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1365 inet->sk_protocol,
1366 ntohs(inet_sk(inet)->inet_sport));
1367
1368 if (err < 0) {
1369 kfree(svsk);
1370 return ERR_PTR(err);
1371 }
1372
1373 inet->sk_user_data = svsk;
1374 svsk->sk_sock = sock;
1375 svsk->sk_sk = inet;
1376 svsk->sk_ostate = inet->sk_state_change;
1377 svsk->sk_odata = inet->sk_data_ready;
1378 svsk->sk_owspace = inet->sk_write_space;
1379
1380 /* Initialize the socket */
1381 if (sock->type == SOCK_DGRAM)
1382 svc_udp_init(svsk, serv);
1383 else {
1384 /* initialise setting must have enough space to
1385 * receive and respond to one request.
1386 */
1387 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1388 4 * serv->sv_max_mesg);
1389 svc_tcp_init(svsk, serv);
1390 }
1391
1392 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1393 svsk, svsk->sk_sk);
1394
1395 return svsk;
1396 }
1397
1398 /**
1399 * svc_addsock - add a listener socket to an RPC service
1400 * @serv: pointer to RPC service to which to add a new listener
1401 * @fd: file descriptor of the new listener
1402 * @name_return: pointer to buffer to fill in with name of listener
1403 * @len: size of the buffer
1404 *
1405 * Fills in socket name and returns positive length of name if successful.
1406 * Name is terminated with '\n'. On error, returns a negative errno
1407 * value.
1408 */
1409 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1410 const size_t len)
1411 {
1412 int err = 0;
1413 struct socket *so = sockfd_lookup(fd, &err);
1414 struct svc_sock *svsk = NULL;
1415 struct sockaddr_storage addr;
1416 struct sockaddr *sin = (struct sockaddr *)&addr;
1417 int salen;
1418
1419 if (!so)
1420 return err;
1421 err = -EAFNOSUPPORT;
1422 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1423 goto out;
1424 err = -EPROTONOSUPPORT;
1425 if (so->sk->sk_protocol != IPPROTO_TCP &&
1426 so->sk->sk_protocol != IPPROTO_UDP)
1427 goto out;
1428 err = -EISCONN;
1429 if (so->state > SS_UNCONNECTED)
1430 goto out;
1431 err = -ENOENT;
1432 if (!try_module_get(THIS_MODULE))
1433 goto out;
1434 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1435 if (IS_ERR(svsk)) {
1436 module_put(THIS_MODULE);
1437 err = PTR_ERR(svsk);
1438 goto out;
1439 }
1440 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1441 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1442 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1443 return svc_one_sock_name(svsk, name_return, len);
1444 out:
1445 sockfd_put(so);
1446 return err;
1447 }
1448 EXPORT_SYMBOL_GPL(svc_addsock);
1449
1450 /*
1451 * Create socket for RPC service.
1452 */
1453 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1454 int protocol,
1455 struct net *net,
1456 struct sockaddr *sin, int len,
1457 int flags)
1458 {
1459 struct svc_sock *svsk;
1460 struct socket *sock;
1461 int error;
1462 int type;
1463 struct sockaddr_storage addr;
1464 struct sockaddr *newsin = (struct sockaddr *)&addr;
1465 int newlen;
1466 int family;
1467 int val;
1468 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1469
1470 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1471 serv->sv_program->pg_name, protocol,
1472 __svc_print_addr(sin, buf, sizeof(buf)));
1473
1474 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1475 printk(KERN_WARNING "svc: only UDP and TCP "
1476 "sockets supported\n");
1477 return ERR_PTR(-EINVAL);
1478 }
1479
1480 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1481 switch (sin->sa_family) {
1482 case AF_INET6:
1483 family = PF_INET6;
1484 break;
1485 case AF_INET:
1486 family = PF_INET;
1487 break;
1488 default:
1489 return ERR_PTR(-EINVAL);
1490 }
1491
1492 error = __sock_create(net, family, type, protocol, &sock, 1);
1493 if (error < 0)
1494 return ERR_PTR(error);
1495
1496 svc_reclassify_socket(sock);
1497
1498 /*
1499 * If this is an PF_INET6 listener, we want to avoid
1500 * getting requests from IPv4 remotes. Those should
1501 * be shunted to a PF_INET listener via rpcbind.
1502 */
1503 val = 1;
1504 if (family == PF_INET6)
1505 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1506 (char *)&val, sizeof(val));
1507
1508 if (type == SOCK_STREAM)
1509 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1510 error = kernel_bind(sock, sin, len);
1511 if (error < 0)
1512 goto bummer;
1513
1514 newlen = len;
1515 error = kernel_getsockname(sock, newsin, &newlen);
1516 if (error < 0)
1517 goto bummer;
1518
1519 if (protocol == IPPROTO_TCP) {
1520 if ((error = kernel_listen(sock, 64)) < 0)
1521 goto bummer;
1522 }
1523
1524 svsk = svc_setup_socket(serv, sock, flags);
1525 if (IS_ERR(svsk)) {
1526 error = PTR_ERR(svsk);
1527 goto bummer;
1528 }
1529 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1530 return (struct svc_xprt *)svsk;
1531 bummer:
1532 dprintk("svc: svc_create_socket error = %d\n", -error);
1533 sock_release(sock);
1534 return ERR_PTR(error);
1535 }
1536
1537 /*
1538 * Detach the svc_sock from the socket so that no
1539 * more callbacks occur.
1540 */
1541 static void svc_sock_detach(struct svc_xprt *xprt)
1542 {
1543 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1544 struct sock *sk = svsk->sk_sk;
1545 wait_queue_head_t *wq;
1546
1547 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1548
1549 /* put back the old socket callbacks */
1550 sk->sk_state_change = svsk->sk_ostate;
1551 sk->sk_data_ready = svsk->sk_odata;
1552 sk->sk_write_space = svsk->sk_owspace;
1553
1554 wq = sk_sleep(sk);
1555 if (wq && waitqueue_active(wq))
1556 wake_up_interruptible(wq);
1557 }
1558
1559 /*
1560 * Disconnect the socket, and reset the callbacks
1561 */
1562 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1563 {
1564 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1565
1566 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1567
1568 svc_sock_detach(xprt);
1569
1570 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1571 svc_tcp_clear_pages(svsk);
1572 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1573 }
1574 }
1575
1576 /*
1577 * Free the svc_sock's socket resources and the svc_sock itself.
1578 */
1579 static void svc_sock_free(struct svc_xprt *xprt)
1580 {
1581 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1582 dprintk("svc: svc_sock_free(%p)\n", svsk);
1583
1584 if (svsk->sk_sock->file)
1585 sockfd_put(svsk->sk_sock);
1586 else
1587 sock_release(svsk->sk_sock);
1588 kfree(svsk);
1589 }
1590
1591 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1592 /*
1593 * Create a back channel svc_xprt which shares the fore channel socket.
1594 */
1595 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1596 int protocol,
1597 struct net *net,
1598 struct sockaddr *sin, int len,
1599 int flags)
1600 {
1601 struct svc_sock *svsk;
1602 struct svc_xprt *xprt;
1603
1604 if (protocol != IPPROTO_TCP) {
1605 printk(KERN_WARNING "svc: only TCP sockets"
1606 " supported on shared back channel\n");
1607 return ERR_PTR(-EINVAL);
1608 }
1609
1610 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1611 if (!svsk)
1612 return ERR_PTR(-ENOMEM);
1613
1614 xprt = &svsk->sk_xprt;
1615 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1616
1617 serv->sv_bc_xprt = xprt;
1618
1619 return xprt;
1620 }
1621
1622 /*
1623 * Free a back channel svc_sock.
1624 */
1625 static void svc_bc_sock_free(struct svc_xprt *xprt)
1626 {
1627 if (xprt)
1628 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1629 }
1630 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
Linux kernel - Deliverables
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