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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
47#include <linux/sunrpc/types.h>
48#include <linux/sunrpc/clnt.h>
49#include <linux/sunrpc/xdr.h>
50#include <linux/sunrpc/msg_prot.h>
51#include <linux/sunrpc/svcsock.h>
52#include <linux/sunrpc/stats.h>
53#include <linux/sunrpc/xprt.h>
54
55#include "sunrpc.h"
56
57#define RPCDBG_FACILITY RPCDBG_SVCXPRT
58
59
60static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
61 int *errp, int flags);
62static void svc_udp_data_ready(struct sock *, int);
63static int svc_udp_recvfrom(struct svc_rqst *);
64static int svc_udp_sendto(struct svc_rqst *);
65static void svc_sock_detach(struct svc_xprt *);
66static void svc_tcp_sock_detach(struct svc_xprt *);
67static void svc_sock_free(struct svc_xprt *);
68
69static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
70 struct net *, struct sockaddr *,
71 int, int);
72#if defined(CONFIG_SUNRPC_BACKCHANNEL)
73static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
74 struct net *, struct sockaddr *,
75 int, int);
76static void svc_bc_sock_free(struct svc_xprt *xprt);
77#endif /* CONFIG_SUNRPC_BACKCHANNEL */
78
79#ifdef CONFIG_DEBUG_LOCK_ALLOC
80static struct lock_class_key svc_key[2];
81static struct lock_class_key svc_slock_key[2];
82
83static void svc_reclassify_socket(struct socket *sock)
84{
85 struct sock *sk = sock->sk;
86 BUG_ON(sock_owned_by_user(sk));
87 switch (sk->sk_family) {
88 case AF_INET:
89 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
90 &svc_slock_key[0],
91 "sk_xprt.xpt_lock-AF_INET-NFSD",
92 &svc_key[0]);
93 break;
94
95 case AF_INET6:
96 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
97 &svc_slock_key[1],
98 "sk_xprt.xpt_lock-AF_INET6-NFSD",
99 &svc_key[1]);
100 break;
101
102 default:
103 BUG();
104 }
105}
106#else
107static void svc_reclassify_socket(struct socket *sock)
108{
109}
110#endif
111
112/*
113 * Release an skbuff after use
114 */
115static void svc_release_skb(struct svc_rqst *rqstp)
116{
117 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
118
119 if (skb) {
120 struct svc_sock *svsk =
121 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
122 rqstp->rq_xprt_ctxt = NULL;
123
124 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
125 skb_free_datagram_locked(svsk->sk_sk, skb);
126 }
127}
128
129union svc_pktinfo_u {
130 struct in_pktinfo pkti;
131 struct in6_pktinfo pkti6;
132};
133#define SVC_PKTINFO_SPACE \
134 CMSG_SPACE(sizeof(union svc_pktinfo_u))
135
136static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
137{
138 struct svc_sock *svsk =
139 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
140 switch (svsk->sk_sk->sk_family) {
141 case AF_INET: {
142 struct in_pktinfo *pki = CMSG_DATA(cmh);
143
144 cmh->cmsg_level = SOL_IP;
145 cmh->cmsg_type = IP_PKTINFO;
146 pki->ipi_ifindex = 0;
147 pki->ipi_spec_dst.s_addr =
148 svc_daddr_in(rqstp)->sin_addr.s_addr;
149 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
150 }
151 break;
152
153 case AF_INET6: {
154 struct in6_pktinfo *pki = CMSG_DATA(cmh);
155 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
156
157 cmh->cmsg_level = SOL_IPV6;
158 cmh->cmsg_type = IPV6_PKTINFO;
159 pki->ipi6_ifindex = daddr->sin6_scope_id;
160 pki->ipi6_addr = daddr->sin6_addr;
161 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
162 }
163 break;
164 }
165}
166
167/*
168 * send routine intended to be shared by the fore- and back-channel
169 */
170int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
171 struct page *headpage, unsigned long headoffset,
172 struct page *tailpage, unsigned long tailoffset)
173{
174 int result;
175 int size;
176 struct page **ppage = xdr->pages;
177 size_t base = xdr->page_base;
178 unsigned int pglen = xdr->page_len;
179 unsigned int flags = MSG_MORE;
180 int slen;
181 int len = 0;
182
183 slen = xdr->len;
184
185 /* send head */
186 if (slen == xdr->head[0].iov_len)
187 flags = 0;
188 len = kernel_sendpage(sock, headpage, headoffset,
189 xdr->head[0].iov_len, flags);
190 if (len != xdr->head[0].iov_len)
191 goto out;
192 slen -= xdr->head[0].iov_len;
193 if (slen == 0)
194 goto out;
195
196 /* send page data */
197 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
198 while (pglen > 0) {
199 if (slen == size)
200 flags = 0;
201 result = kernel_sendpage(sock, *ppage, base, size, flags);
202 if (result > 0)
203 len += result;
204 if (result != size)
205 goto out;
206 slen -= size;
207 pglen -= size;
208 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
209 base = 0;
210 ppage++;
211 }
212
213 /* send tail */
214 if (xdr->tail[0].iov_len) {
215 result = kernel_sendpage(sock, tailpage, tailoffset,
216 xdr->tail[0].iov_len, 0);
217 if (result > 0)
218 len += result;
219 }
220
221out:
222 return len;
223}
224
225
226/*
227 * Generic sendto routine
228 */
229static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
230{
231 struct svc_sock *svsk =
232 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
233 struct socket *sock = svsk->sk_sock;
234 union {
235 struct cmsghdr hdr;
236 long all[SVC_PKTINFO_SPACE / sizeof(long)];
237 } buffer;
238 struct cmsghdr *cmh = &buffer.hdr;
239 int len = 0;
240 unsigned long tailoff;
241 unsigned long headoff;
242 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
243
244 if (rqstp->rq_prot == IPPROTO_UDP) {
245 struct msghdr msg = {
246 .msg_name = &rqstp->rq_addr,
247 .msg_namelen = rqstp->rq_addrlen,
248 .msg_control = cmh,
249 .msg_controllen = sizeof(buffer),
250 .msg_flags = MSG_MORE,
251 };
252
253 svc_set_cmsg_data(rqstp, cmh);
254
255 if (sock_sendmsg(sock, &msg, 0) < 0)
256 goto out;
257 }
258
259 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
260 headoff = 0;
261 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
262 rqstp->rq_respages[0], tailoff);
263
264out:
265 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
266 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
267 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
268
269 return len;
270}
271
272/*
273 * Report socket names for nfsdfs
274 */
275static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
276{
277 const struct sock *sk = svsk->sk_sk;
278 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
279 "udp" : "tcp";
280 int len;
281
282 switch (sk->sk_family) {
283 case PF_INET:
284 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
285 proto_name,
286 &inet_sk(sk)->inet_rcv_saddr,
287 inet_sk(sk)->inet_num);
288 break;
289 case PF_INET6:
290 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
291 proto_name,
292 &inet6_sk(sk)->rcv_saddr,
293 inet_sk(sk)->inet_num);
294 break;
295 default:
296 len = snprintf(buf, remaining, "*unknown-%d*\n",
297 sk->sk_family);
298 }
299
300 if (len >= remaining) {
301 *buf = '\0';
302 return -ENAMETOOLONG;
303 }
304 return len;
305}
306
307/**
308 * svc_sock_names - construct a list of listener names in a string
309 * @serv: pointer to RPC service
310 * @buf: pointer to a buffer to fill in with socket names
311 * @buflen: size of the buffer to be filled
312 * @toclose: pointer to '\0'-terminated C string containing the name
313 * of a listener to be closed
314 *
315 * Fills in @buf with a '\n'-separated list of names of listener
316 * sockets. If @toclose is not NULL, the socket named by @toclose
317 * is closed, and is not included in the output list.
318 *
319 * Returns positive length of the socket name string, or a negative
320 * errno value on error.
321 */
322int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
323 const char *toclose)
324{
325 struct svc_sock *svsk, *closesk = NULL;
326 int len = 0;
327
328 if (!serv)
329 return 0;
330
331 spin_lock_bh(&serv->sv_lock);
332 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
333 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
334 if (onelen < 0) {
335 len = onelen;
336 break;
337 }
338 if (toclose && strcmp(toclose, buf + len) == 0) {
339 closesk = svsk;
340 svc_xprt_get(&closesk->sk_xprt);
341 } else
342 len += onelen;
343 }
344 spin_unlock_bh(&serv->sv_lock);
345
346 if (closesk) {
347 /* Should unregister with portmap, but you cannot
348 * unregister just one protocol...
349 */
350 svc_close_xprt(&closesk->sk_xprt);
351 svc_xprt_put(&closesk->sk_xprt);
352 } else if (toclose)
353 return -ENOENT;
354 return len;
355}
356EXPORT_SYMBOL_GPL(svc_sock_names);
357
358/*
359 * Check input queue length
360 */
361static int svc_recv_available(struct svc_sock *svsk)
362{
363 struct socket *sock = svsk->sk_sock;
364 int avail, err;
365
366 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
367
368 return (err >= 0)? avail : err;
369}
370
371/*
372 * Generic recvfrom routine.
373 */
374static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
375 int buflen)
376{
377 struct svc_sock *svsk =
378 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
379 struct msghdr msg = {
380 .msg_flags = MSG_DONTWAIT,
381 };
382 int len;
383
384 rqstp->rq_xprt_hlen = 0;
385
386 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
387 msg.msg_flags);
388
389 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
390 svsk, iov[0].iov_base, iov[0].iov_len, len);
391 return len;
392}
393
394static int svc_partial_recvfrom(struct svc_rqst *rqstp,
395 struct kvec *iov, int nr,
396 int buflen, unsigned int base)
397{
398 size_t save_iovlen;
399 void *save_iovbase;
400 unsigned int i;
401 int ret;
402
403 if (base == 0)
404 return svc_recvfrom(rqstp, iov, nr, buflen);
405
406 for (i = 0; i < nr; i++) {
407 if (iov[i].iov_len > base)
408 break;
409 base -= iov[i].iov_len;
410 }
411 save_iovlen = iov[i].iov_len;
412 save_iovbase = iov[i].iov_base;
413 iov[i].iov_len -= base;
414 iov[i].iov_base += base;
415 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
416 iov[i].iov_len = save_iovlen;
417 iov[i].iov_base = save_iovbase;
418 return ret;
419}
420
421/*
422 * Set socket snd and rcv buffer lengths
423 */
424static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
425 unsigned int rcv)
426{
427#if 0
428 mm_segment_t oldfs;
429 oldfs = get_fs(); set_fs(KERNEL_DS);
430 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
431 (char*)&snd, sizeof(snd));
432 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
433 (char*)&rcv, sizeof(rcv));
434#else
435 /* sock_setsockopt limits use to sysctl_?mem_max,
436 * which isn't acceptable. Until that is made conditional
437 * on not having CAP_SYS_RESOURCE or similar, we go direct...
438 * DaveM said I could!
439 */
440 lock_sock(sock->sk);
441 sock->sk->sk_sndbuf = snd * 2;
442 sock->sk->sk_rcvbuf = rcv * 2;
443 sock->sk->sk_write_space(sock->sk);
444 release_sock(sock->sk);
445#endif
446}
447/*
448 * INET callback when data has been received on the socket.
449 */
450static void svc_udp_data_ready(struct sock *sk, int count)
451{
452 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
453 wait_queue_head_t *wq = sk_sleep(sk);
454
455 if (svsk) {
456 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
457 svsk, sk, count,
458 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
459 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
460 svc_xprt_enqueue(&svsk->sk_xprt);
461 }
462 if (wq && waitqueue_active(wq))
463 wake_up_interruptible(wq);
464}
465
466/*
467 * INET callback when space is newly available on the socket.
468 */
469static void svc_write_space(struct sock *sk)
470{
471 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
472 wait_queue_head_t *wq = sk_sleep(sk);
473
474 if (svsk) {
475 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
476 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
477 svc_xprt_enqueue(&svsk->sk_xprt);
478 }
479
480 if (wq && waitqueue_active(wq)) {
481 dprintk("RPC svc_write_space: someone sleeping on %p\n",
482 svsk);
483 wake_up_interruptible(wq);
484 }
485}
486
487static void svc_tcp_write_space(struct sock *sk)
488{
489 struct socket *sock = sk->sk_socket;
490
491 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
492 clear_bit(SOCK_NOSPACE, &sock->flags);
493 svc_write_space(sk);
494}
495
496/*
497 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
498 */
499static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
500 struct cmsghdr *cmh)
501{
502 struct in_pktinfo *pki = CMSG_DATA(cmh);
503 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
504
505 if (cmh->cmsg_type != IP_PKTINFO)
506 return 0;
507
508 daddr->sin_family = AF_INET;
509 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
510 return 1;
511}
512
513/*
514 * See net/ipv6/datagram.c : datagram_recv_ctl
515 */
516static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
517 struct cmsghdr *cmh)
518{
519 struct in6_pktinfo *pki = CMSG_DATA(cmh);
520 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
521
522 if (cmh->cmsg_type != IPV6_PKTINFO)
523 return 0;
524
525 daddr->sin6_family = AF_INET6;
526 daddr->sin6_addr = pki->ipi6_addr;
527 daddr->sin6_scope_id = pki->ipi6_ifindex;
528 return 1;
529}
530
531/*
532 * Copy the UDP datagram's destination address to the rqstp structure.
533 * The 'destination' address in this case is the address to which the
534 * peer sent the datagram, i.e. our local address. For multihomed
535 * hosts, this can change from msg to msg. Note that only the IP
536 * address changes, the port number should remain the same.
537 */
538static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
539 struct cmsghdr *cmh)
540{
541 switch (cmh->cmsg_level) {
542 case SOL_IP:
543 return svc_udp_get_dest_address4(rqstp, cmh);
544 case SOL_IPV6:
545 return svc_udp_get_dest_address6(rqstp, cmh);
546 }
547
548 return 0;
549}
550
551/*
552 * Receive a datagram from a UDP socket.
553 */
554static int svc_udp_recvfrom(struct svc_rqst *rqstp)
555{
556 struct svc_sock *svsk =
557 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
558 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
559 struct sk_buff *skb;
560 union {
561 struct cmsghdr hdr;
562 long all[SVC_PKTINFO_SPACE / sizeof(long)];
563 } buffer;
564 struct cmsghdr *cmh = &buffer.hdr;
565 struct msghdr msg = {
566 .msg_name = svc_addr(rqstp),
567 .msg_control = cmh,
568 .msg_controllen = sizeof(buffer),
569 .msg_flags = MSG_DONTWAIT,
570 };
571 size_t len;
572 int err;
573
574 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
575 /* udp sockets need large rcvbuf as all pending
576 * requests are still in that buffer. sndbuf must
577 * also be large enough that there is enough space
578 * for one reply per thread. We count all threads
579 * rather than threads in a particular pool, which
580 * provides an upper bound on the number of threads
581 * which will access the socket.
582 */
583 svc_sock_setbufsize(svsk->sk_sock,
584 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
585 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
586
587 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
588 skb = NULL;
589 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
590 0, 0, MSG_PEEK | MSG_DONTWAIT);
591 if (err >= 0)
592 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
593
594 if (skb == NULL) {
595 if (err != -EAGAIN) {
596 /* possibly an icmp error */
597 dprintk("svc: recvfrom returned error %d\n", -err);
598 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
599 }
600 return -EAGAIN;
601 }
602 len = svc_addr_len(svc_addr(rqstp));
603 if (len == 0)
604 return -EAFNOSUPPORT;
605 rqstp->rq_addrlen = len;
606 if (skb->tstamp.tv64 == 0) {
607 skb->tstamp = ktime_get_real();
608 /* Don't enable netstamp, sunrpc doesn't
609 need that much accuracy */
610 }
611 svsk->sk_sk->sk_stamp = skb->tstamp;
612 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
613
614 len = skb->len - sizeof(struct udphdr);
615 rqstp->rq_arg.len = len;
616
617 rqstp->rq_prot = IPPROTO_UDP;
618
619 if (!svc_udp_get_dest_address(rqstp, cmh)) {
620 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
621 cmh->cmsg_level, cmh->cmsg_type);
622 skb_free_datagram_locked(svsk->sk_sk, skb);
623 return 0;
624 }
625 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
626
627 if (skb_is_nonlinear(skb)) {
628 /* we have to copy */
629 local_bh_disable();
630 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
631 local_bh_enable();
632 /* checksum error */
633 skb_free_datagram_locked(svsk->sk_sk, skb);
634 return 0;
635 }
636 local_bh_enable();
637 skb_free_datagram_locked(svsk->sk_sk, skb);
638 } else {
639 /* we can use it in-place */
640 rqstp->rq_arg.head[0].iov_base = skb->data +
641 sizeof(struct udphdr);
642 rqstp->rq_arg.head[0].iov_len = len;
643 if (skb_checksum_complete(skb)) {
644 skb_free_datagram_locked(svsk->sk_sk, skb);
645 return 0;
646 }
647 rqstp->rq_xprt_ctxt = skb;
648 }
649
650 rqstp->rq_arg.page_base = 0;
651 if (len <= rqstp->rq_arg.head[0].iov_len) {
652 rqstp->rq_arg.head[0].iov_len = len;
653 rqstp->rq_arg.page_len = 0;
654 rqstp->rq_respages = rqstp->rq_pages+1;
655 } else {
656 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
657 rqstp->rq_respages = rqstp->rq_pages + 1 +
658 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
659 }
660
661 if (serv->sv_stats)
662 serv->sv_stats->netudpcnt++;
663
664 return len;
665}
666
667static int
668svc_udp_sendto(struct svc_rqst *rqstp)
669{
670 int error;
671
672 error = svc_sendto(rqstp, &rqstp->rq_res);
673 if (error == -ECONNREFUSED)
674 /* ICMP error on earlier request. */
675 error = svc_sendto(rqstp, &rqstp->rq_res);
676
677 return error;
678}
679
680static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
681{
682}
683
684static int svc_udp_has_wspace(struct svc_xprt *xprt)
685{
686 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
687 struct svc_serv *serv = xprt->xpt_server;
688 unsigned long required;
689
690 /*
691 * Set the SOCK_NOSPACE flag before checking the available
692 * sock space.
693 */
694 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
695 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
696 if (required*2 > sock_wspace(svsk->sk_sk))
697 return 0;
698 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
699 return 1;
700}
701
702static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
703{
704 BUG();
705 return NULL;
706}
707
708static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
709 struct net *net,
710 struct sockaddr *sa, int salen,
711 int flags)
712{
713 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
714}
715
716static struct svc_xprt_ops svc_udp_ops = {
717 .xpo_create = svc_udp_create,
718 .xpo_recvfrom = svc_udp_recvfrom,
719 .xpo_sendto = svc_udp_sendto,
720 .xpo_release_rqst = svc_release_skb,
721 .xpo_detach = svc_sock_detach,
722 .xpo_free = svc_sock_free,
723 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
724 .xpo_has_wspace = svc_udp_has_wspace,
725 .xpo_accept = svc_udp_accept,
726};
727
728static struct svc_xprt_class svc_udp_class = {
729 .xcl_name = "udp",
730 .xcl_owner = THIS_MODULE,
731 .xcl_ops = &svc_udp_ops,
732 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
733};
734
735static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
736{
737 int err, level, optname, one = 1;
738
739 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
740 &svsk->sk_xprt, serv);
741 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
742 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
743 svsk->sk_sk->sk_write_space = svc_write_space;
744
745 /* initialise setting must have enough space to
746 * receive and respond to one request.
747 * svc_udp_recvfrom will re-adjust if necessary
748 */
749 svc_sock_setbufsize(svsk->sk_sock,
750 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
751 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
752
753 /* data might have come in before data_ready set up */
754 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
755 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
756
757 /* make sure we get destination address info */
758 switch (svsk->sk_sk->sk_family) {
759 case AF_INET:
760 level = SOL_IP;
761 optname = IP_PKTINFO;
762 break;
763 case AF_INET6:
764 level = SOL_IPV6;
765 optname = IPV6_RECVPKTINFO;
766 break;
767 default:
768 BUG();
769 }
770 err = kernel_setsockopt(svsk->sk_sock, level, optname,
771 (char *)&one, sizeof(one));
772 dprintk("svc: kernel_setsockopt returned %d\n", err);
773}
774
775/*
776 * A data_ready event on a listening socket means there's a connection
777 * pending. Do not use state_change as a substitute for it.
778 */
779static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
780{
781 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
782 wait_queue_head_t *wq;
783
784 dprintk("svc: socket %p TCP (listen) state change %d\n",
785 sk, sk->sk_state);
786
787 /*
788 * This callback may called twice when a new connection
789 * is established as a child socket inherits everything
790 * from a parent LISTEN socket.
791 * 1) data_ready method of the parent socket will be called
792 * when one of child sockets become ESTABLISHED.
793 * 2) data_ready method of the child socket may be called
794 * when it receives data before the socket is accepted.
795 * In case of 2, we should ignore it silently.
796 */
797 if (sk->sk_state == TCP_LISTEN) {
798 if (svsk) {
799 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
800 svc_xprt_enqueue(&svsk->sk_xprt);
801 } else
802 printk("svc: socket %p: no user data\n", sk);
803 }
804
805 wq = sk_sleep(sk);
806 if (wq && waitqueue_active(wq))
807 wake_up_interruptible_all(wq);
808}
809
810/*
811 * A state change on a connected socket means it's dying or dead.
812 */
813static void svc_tcp_state_change(struct sock *sk)
814{
815 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
816 wait_queue_head_t *wq = sk_sleep(sk);
817
818 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
819 sk, sk->sk_state, sk->sk_user_data);
820
821 if (!svsk)
822 printk("svc: socket %p: no user data\n", sk);
823 else {
824 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
825 svc_xprt_enqueue(&svsk->sk_xprt);
826 }
827 if (wq && waitqueue_active(wq))
828 wake_up_interruptible_all(wq);
829}
830
831static void svc_tcp_data_ready(struct sock *sk, int count)
832{
833 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
834 wait_queue_head_t *wq = sk_sleep(sk);
835
836 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
837 sk, sk->sk_user_data);
838 if (svsk) {
839 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
840 svc_xprt_enqueue(&svsk->sk_xprt);
841 }
842 if (wq && waitqueue_active(wq))
843 wake_up_interruptible(wq);
844}
845
846/*
847 * Accept a TCP connection
848 */
849static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
850{
851 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
852 struct sockaddr_storage addr;
853 struct sockaddr *sin = (struct sockaddr *) &addr;
854 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
855 struct socket *sock = svsk->sk_sock;
856 struct socket *newsock;
857 struct svc_sock *newsvsk;
858 int err, slen;
859 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
860
861 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
862 if (!sock)
863 return NULL;
864
865 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
866 err = kernel_accept(sock, &newsock, O_NONBLOCK);
867 if (err < 0) {
868 if (err == -ENOMEM)
869 printk(KERN_WARNING "%s: no more sockets!\n",
870 serv->sv_name);
871 else if (err != -EAGAIN)
872 net_warn_ratelimited("%s: accept failed (err %d)!\n",
873 serv->sv_name, -err);
874 return NULL;
875 }
876 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
877
878 err = kernel_getpeername(newsock, sin, &slen);
879 if (err < 0) {
880 net_warn_ratelimited("%s: peername failed (err %d)!\n",
881 serv->sv_name, -err);
882 goto failed; /* aborted connection or whatever */
883 }
884
885 /* Ideally, we would want to reject connections from unauthorized
886 * hosts here, but when we get encryption, the IP of the host won't
887 * tell us anything. For now just warn about unpriv connections.
888 */
889 if (!svc_port_is_privileged(sin)) {
890 dprintk(KERN_WARNING
891 "%s: connect from unprivileged port: %s\n",
892 serv->sv_name,
893 __svc_print_addr(sin, buf, sizeof(buf)));
894 }
895 dprintk("%s: connect from %s\n", serv->sv_name,
896 __svc_print_addr(sin, buf, sizeof(buf)));
897
898 /* make sure that a write doesn't block forever when
899 * low on memory
900 */
901 newsock->sk->sk_sndtimeo = HZ*30;
902
903 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
904 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
905 goto failed;
906 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
907 err = kernel_getsockname(newsock, sin, &slen);
908 if (unlikely(err < 0)) {
909 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
910 slen = offsetof(struct sockaddr, sa_data);
911 }
912 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
913
914 if (serv->sv_stats)
915 serv->sv_stats->nettcpconn++;
916
917 return &newsvsk->sk_xprt;
918
919failed:
920 sock_release(newsock);
921 return NULL;
922}
923
924static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
925{
926 unsigned int i, len, npages;
927
928 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
929 return 0;
930 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
931 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
932 for (i = 0; i < npages; i++) {
933 if (rqstp->rq_pages[i] != NULL)
934 put_page(rqstp->rq_pages[i]);
935 BUG_ON(svsk->sk_pages[i] == NULL);
936 rqstp->rq_pages[i] = svsk->sk_pages[i];
937 svsk->sk_pages[i] = NULL;
938 }
939 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
940 return len;
941}
942
943static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
944{
945 unsigned int i, len, npages;
946
947 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
948 return;
949 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
950 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
951 for (i = 0; i < npages; i++) {
952 svsk->sk_pages[i] = rqstp->rq_pages[i];
953 rqstp->rq_pages[i] = NULL;
954 }
955}
956
957static void svc_tcp_clear_pages(struct svc_sock *svsk)
958{
959 unsigned int i, len, npages;
960
961 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
962 goto out;
963 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
964 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
965 for (i = 0; i < npages; i++) {
966 BUG_ON(svsk->sk_pages[i] == NULL);
967 put_page(svsk->sk_pages[i]);
968 svsk->sk_pages[i] = NULL;
969 }
970out:
971 svsk->sk_tcplen = 0;
972}
973
974/*
975 * Receive data.
976 * If we haven't gotten the record length yet, get the next four bytes.
977 * Otherwise try to gobble up as much as possible up to the complete
978 * record length.
979 */
980static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
981{
982 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
983 unsigned int want;
984 int len;
985
986 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
987
988 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
989 struct kvec iov;
990
991 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
992 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
993 iov.iov_len = want;
994 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
995 goto error;
996 svsk->sk_tcplen += len;
997
998 if (len < want) {
999 dprintk("svc: short recvfrom while reading record "
1000 "length (%d of %d)\n", len, want);
1001 return -EAGAIN;
1002 }
1003
1004 svsk->sk_reclen = ntohl(svsk->sk_reclen);
1005 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
1006 /* FIXME: technically, a record can be fragmented,
1007 * and non-terminal fragments will not have the top
1008 * bit set in the fragment length header.
1009 * But apparently no known nfs clients send fragmented
1010 * records. */
1011 net_notice_ratelimited("RPC: multiple fragments per record not supported\n");
1012 goto err_delete;
1013 }
1014
1015 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
1016 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
1017 if (svsk->sk_reclen > serv->sv_max_mesg) {
1018 net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n",
1019 (unsigned long)svsk->sk_reclen);
1020 goto err_delete;
1021 }
1022 }
1023
1024 if (svsk->sk_reclen < 8)
1025 goto err_delete; /* client is nuts. */
1026
1027 len = svsk->sk_reclen;
1028
1029 return len;
1030error:
1031 dprintk("RPC: TCP recv_record got %d\n", len);
1032 return len;
1033err_delete:
1034 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1035 return -EAGAIN;
1036}
1037
1038static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
1039{
1040 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
1041 struct rpc_rqst *req = NULL;
1042 struct kvec *src, *dst;
1043 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1044 __be32 xid;
1045 __be32 calldir;
1046
1047 xid = *p++;
1048 calldir = *p;
1049
1050 if (bc_xprt)
1051 req = xprt_lookup_rqst(bc_xprt, xid);
1052
1053 if (!req) {
1054 printk(KERN_NOTICE
1055 "%s: Got unrecognized reply: "
1056 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1057 __func__, ntohl(calldir),
1058 bc_xprt, xid);
1059 return -EAGAIN;
1060 }
1061
1062 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1063 /*
1064 * XXX!: cheating for now! Only copying HEAD.
1065 * But we know this is good enough for now (in fact, for any
1066 * callback reply in the forseeable future).
1067 */
1068 dst = &req->rq_private_buf.head[0];
1069 src = &rqstp->rq_arg.head[0];
1070 if (dst->iov_len < src->iov_len)
1071 return -EAGAIN; /* whatever; just giving up. */
1072 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1073 xprt_complete_rqst(req->rq_task, svsk->sk_reclen);
1074 rqstp->rq_arg.len = 0;
1075 return 0;
1076}
1077
1078static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1079{
1080 int i = 0;
1081 int t = 0;
1082
1083 while (t < len) {
1084 vec[i].iov_base = page_address(pages[i]);
1085 vec[i].iov_len = PAGE_SIZE;
1086 i++;
1087 t += PAGE_SIZE;
1088 }
1089 return i;
1090}
1091
1092
1093/*
1094 * Receive data from a TCP socket.
1095 */
1096static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1097{
1098 struct svc_sock *svsk =
1099 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1100 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1101 int len;
1102 struct kvec *vec;
1103 unsigned int want, base;
1104 __be32 *p;
1105 __be32 calldir;
1106 int pnum;
1107
1108 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1109 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1110 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1111 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1112
1113 len = svc_tcp_recv_record(svsk, rqstp);
1114 if (len < 0)
1115 goto error;
1116
1117 base = svc_tcp_restore_pages(svsk, rqstp);
1118 want = svsk->sk_reclen - base;
1119
1120 vec = rqstp->rq_vec;
1121
1122 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1123 svsk->sk_reclen);
1124
1125 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1126
1127 /* Now receive data */
1128 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1129 if (len >= 0)
1130 svsk->sk_tcplen += len;
1131 if (len != want) {
1132 svc_tcp_save_pages(svsk, rqstp);
1133 if (len < 0 && len != -EAGAIN)
1134 goto err_other;
1135 dprintk("svc: incomplete TCP record (%d of %d)\n",
1136 svsk->sk_tcplen, svsk->sk_reclen);
1137 goto err_noclose;
1138 }
1139
1140 rqstp->rq_arg.len = svsk->sk_reclen;
1141 rqstp->rq_arg.page_base = 0;
1142 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1143 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1144 rqstp->rq_arg.page_len = 0;
1145 } else
1146 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1147
1148 rqstp->rq_xprt_ctxt = NULL;
1149 rqstp->rq_prot = IPPROTO_TCP;
1150
1151 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1152 calldir = p[1];
1153 if (calldir)
1154 len = receive_cb_reply(svsk, rqstp);
1155
1156 /* Reset TCP read info */
1157 svsk->sk_reclen = 0;
1158 svsk->sk_tcplen = 0;
1159 /* If we have more data, signal svc_xprt_enqueue() to try again */
1160 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1161 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1162
1163 if (len < 0)
1164 goto error;
1165
1166 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1167 if (serv->sv_stats)
1168 serv->sv_stats->nettcpcnt++;
1169
1170 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len);
1171 return rqstp->rq_arg.len;
1172
1173error:
1174 if (len != -EAGAIN)
1175 goto err_other;
1176 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1177 return -EAGAIN;
1178err_other:
1179 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1180 svsk->sk_xprt.xpt_server->sv_name, -len);
1181 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1182err_noclose:
1183 return -EAGAIN; /* record not complete */
1184}
1185
1186/*
1187 * Send out data on TCP socket.
1188 */
1189static int svc_tcp_sendto(struct svc_rqst *rqstp)
1190{
1191 struct xdr_buf *xbufp = &rqstp->rq_res;
1192 int sent;
1193 __be32 reclen;
1194
1195 /* Set up the first element of the reply kvec.
1196 * Any other kvecs that may be in use have been taken
1197 * care of by the server implementation itself.
1198 */
1199 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1200 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1201
1202 sent = svc_sendto(rqstp, &rqstp->rq_res);
1203 if (sent != xbufp->len) {
1204 printk(KERN_NOTICE
1205 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1206 "- shutting down socket\n",
1207 rqstp->rq_xprt->xpt_server->sv_name,
1208 (sent<0)?"got error":"sent only",
1209 sent, xbufp->len);
1210 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1211 svc_xprt_enqueue(rqstp->rq_xprt);
1212 sent = -EAGAIN;
1213 }
1214 return sent;
1215}
1216
1217/*
1218 * Setup response header. TCP has a 4B record length field.
1219 */
1220static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1221{
1222 struct kvec *resv = &rqstp->rq_res.head[0];
1223
1224 /* tcp needs a space for the record length... */
1225 svc_putnl(resv, 0);
1226}
1227
1228static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1229{
1230 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1231 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1232 int required;
1233
1234 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1235 return 1;
1236 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1237 if (sk_stream_wspace(svsk->sk_sk) >= required)
1238 return 1;
1239 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1240 return 0;
1241}
1242
1243static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1244 struct net *net,
1245 struct sockaddr *sa, int salen,
1246 int flags)
1247{
1248 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1249}
1250
1251#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1252static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1253 struct net *, struct sockaddr *,
1254 int, int);
1255static void svc_bc_sock_free(struct svc_xprt *xprt);
1256
1257static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1258 struct net *net,
1259 struct sockaddr *sa, int salen,
1260 int flags)
1261{
1262 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1263}
1264
1265static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1266{
1267}
1268
1269static struct svc_xprt_ops svc_tcp_bc_ops = {
1270 .xpo_create = svc_bc_tcp_create,
1271 .xpo_detach = svc_bc_tcp_sock_detach,
1272 .xpo_free = svc_bc_sock_free,
1273 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1274};
1275
1276static struct svc_xprt_class svc_tcp_bc_class = {
1277 .xcl_name = "tcp-bc",
1278 .xcl_owner = THIS_MODULE,
1279 .xcl_ops = &svc_tcp_bc_ops,
1280 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1281};
1282
1283static void svc_init_bc_xprt_sock(void)
1284{
1285 svc_reg_xprt_class(&svc_tcp_bc_class);
1286}
1287
1288static void svc_cleanup_bc_xprt_sock(void)
1289{
1290 svc_unreg_xprt_class(&svc_tcp_bc_class);
1291}
1292#else /* CONFIG_SUNRPC_BACKCHANNEL */
1293static void svc_init_bc_xprt_sock(void)
1294{
1295}
1296
1297static void svc_cleanup_bc_xprt_sock(void)
1298{
1299}
1300#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1301
1302static struct svc_xprt_ops svc_tcp_ops = {
1303 .xpo_create = svc_tcp_create,
1304 .xpo_recvfrom = svc_tcp_recvfrom,
1305 .xpo_sendto = svc_tcp_sendto,
1306 .xpo_release_rqst = svc_release_skb,
1307 .xpo_detach = svc_tcp_sock_detach,
1308 .xpo_free = svc_sock_free,
1309 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1310 .xpo_has_wspace = svc_tcp_has_wspace,
1311 .xpo_accept = svc_tcp_accept,
1312};
1313
1314static struct svc_xprt_class svc_tcp_class = {
1315 .xcl_name = "tcp",
1316 .xcl_owner = THIS_MODULE,
1317 .xcl_ops = &svc_tcp_ops,
1318 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1319};
1320
1321void svc_init_xprt_sock(void)
1322{
1323 svc_reg_xprt_class(&svc_tcp_class);
1324 svc_reg_xprt_class(&svc_udp_class);
1325 svc_init_bc_xprt_sock();
1326}
1327
1328void svc_cleanup_xprt_sock(void)
1329{
1330 svc_unreg_xprt_class(&svc_tcp_class);
1331 svc_unreg_xprt_class(&svc_udp_class);
1332 svc_cleanup_bc_xprt_sock();
1333}
1334
1335static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1336{
1337 struct sock *sk = svsk->sk_sk;
1338
1339 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1340 &svsk->sk_xprt, serv);
1341 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1342 if (sk->sk_state == TCP_LISTEN) {
1343 dprintk("setting up TCP socket for listening\n");
1344 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1345 sk->sk_data_ready = svc_tcp_listen_data_ready;
1346 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1347 } else {
1348 dprintk("setting up TCP socket for reading\n");
1349 sk->sk_state_change = svc_tcp_state_change;
1350 sk->sk_data_ready = svc_tcp_data_ready;
1351 sk->sk_write_space = svc_tcp_write_space;
1352
1353 svsk->sk_reclen = 0;
1354 svsk->sk_tcplen = 0;
1355 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1356
1357 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1358
1359 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1360 if (sk->sk_state != TCP_ESTABLISHED)
1361 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1362 }
1363}
1364
1365void svc_sock_update_bufs(struct svc_serv *serv)
1366{
1367 /*
1368 * The number of server threads has changed. Update
1369 * rcvbuf and sndbuf accordingly on all sockets
1370 */
1371 struct svc_sock *svsk;
1372
1373 spin_lock_bh(&serv->sv_lock);
1374 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1375 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1376 spin_unlock_bh(&serv->sv_lock);
1377}
1378EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1379
1380/*
1381 * Initialize socket for RPC use and create svc_sock struct
1382 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1383 */
1384static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1385 struct socket *sock,
1386 int *errp, int flags)
1387{
1388 struct svc_sock *svsk;
1389 struct sock *inet;
1390 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1391
1392 dprintk("svc: svc_setup_socket %p\n", sock);
1393 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
1394 *errp = -ENOMEM;
1395 return NULL;
1396 }
1397
1398 inet = sock->sk;
1399
1400 /* Register socket with portmapper */
1401 if (*errp >= 0 && pmap_register)
1402 *errp = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1403 inet->sk_protocol,
1404 ntohs(inet_sk(inet)->inet_sport));
1405
1406 if (*errp < 0) {
1407 kfree(svsk);
1408 return NULL;
1409 }
1410
1411 inet->sk_user_data = svsk;
1412 svsk->sk_sock = sock;
1413 svsk->sk_sk = inet;
1414 svsk->sk_ostate = inet->sk_state_change;
1415 svsk->sk_odata = inet->sk_data_ready;
1416 svsk->sk_owspace = inet->sk_write_space;
1417
1418 /* Initialize the socket */
1419 if (sock->type == SOCK_DGRAM)
1420 svc_udp_init(svsk, serv);
1421 else {
1422 /* initialise setting must have enough space to
1423 * receive and respond to one request.
1424 */
1425 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1426 4 * serv->sv_max_mesg);
1427 svc_tcp_init(svsk, serv);
1428 }
1429
1430 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1431 svsk, svsk->sk_sk);
1432
1433 return svsk;
1434}
1435
1436/**
1437 * svc_addsock - add a listener socket to an RPC service
1438 * @serv: pointer to RPC service to which to add a new listener
1439 * @fd: file descriptor of the new listener
1440 * @name_return: pointer to buffer to fill in with name of listener
1441 * @len: size of the buffer
1442 *
1443 * Fills in socket name and returns positive length of name if successful.
1444 * Name is terminated with '\n'. On error, returns a negative errno
1445 * value.
1446 */
1447int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1448 const size_t len)
1449{
1450 int err = 0;
1451 struct socket *so = sockfd_lookup(fd, &err);
1452 struct svc_sock *svsk = NULL;
1453
1454 if (!so)
1455 return err;
1456 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1457 err = -EAFNOSUPPORT;
1458 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1459 so->sk->sk_protocol != IPPROTO_UDP)
1460 err = -EPROTONOSUPPORT;
1461 else if (so->state > SS_UNCONNECTED)
1462 err = -EISCONN;
1463 else {
1464 if (!try_module_get(THIS_MODULE))
1465 err = -ENOENT;
1466 else
1467 svsk = svc_setup_socket(serv, so, &err,
1468 SVC_SOCK_DEFAULTS);
1469 if (svsk) {
1470 struct sockaddr_storage addr;
1471 struct sockaddr *sin = (struct sockaddr *)&addr;
1472 int salen;
1473 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1474 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1475 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1476 spin_lock_bh(&serv->sv_lock);
1477 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1478 spin_unlock_bh(&serv->sv_lock);
1479 svc_xprt_received(&svsk->sk_xprt);
1480 err = 0;
1481 } else
1482 module_put(THIS_MODULE);
1483 }
1484 if (err) {
1485 sockfd_put(so);
1486 return err;
1487 }
1488 return svc_one_sock_name(svsk, name_return, len);
1489}
1490EXPORT_SYMBOL_GPL(svc_addsock);
1491
1492/*
1493 * Create socket for RPC service.
1494 */
1495static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1496 int protocol,
1497 struct net *net,
1498 struct sockaddr *sin, int len,
1499 int flags)
1500{
1501 struct svc_sock *svsk;
1502 struct socket *sock;
1503 int error;
1504 int type;
1505 struct sockaddr_storage addr;
1506 struct sockaddr *newsin = (struct sockaddr *)&addr;
1507 int newlen;
1508 int family;
1509 int val;
1510 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1511
1512 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1513 serv->sv_program->pg_name, protocol,
1514 __svc_print_addr(sin, buf, sizeof(buf)));
1515
1516 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1517 printk(KERN_WARNING "svc: only UDP and TCP "
1518 "sockets supported\n");
1519 return ERR_PTR(-EINVAL);
1520 }
1521
1522 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1523 switch (sin->sa_family) {
1524 case AF_INET6:
1525 family = PF_INET6;
1526 break;
1527 case AF_INET:
1528 family = PF_INET;
1529 break;
1530 default:
1531 return ERR_PTR(-EINVAL);
1532 }
1533
1534 error = __sock_create(net, family, type, protocol, &sock, 1);
1535 if (error < 0)
1536 return ERR_PTR(error);
1537
1538 svc_reclassify_socket(sock);
1539
1540 /*
1541 * If this is an PF_INET6 listener, we want to avoid
1542 * getting requests from IPv4 remotes. Those should
1543 * be shunted to a PF_INET listener via rpcbind.
1544 */
1545 val = 1;
1546 if (family == PF_INET6)
1547 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1548 (char *)&val, sizeof(val));
1549
1550 if (type == SOCK_STREAM)
1551 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1552 error = kernel_bind(sock, sin, len);
1553 if (error < 0)
1554 goto bummer;
1555
1556 newlen = len;
1557 error = kernel_getsockname(sock, newsin, &newlen);
1558 if (error < 0)
1559 goto bummer;
1560
1561 if (protocol == IPPROTO_TCP) {
1562 if ((error = kernel_listen(sock, 64)) < 0)
1563 goto bummer;
1564 }
1565
1566 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
1567 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1568 return (struct svc_xprt *)svsk;
1569 }
1570
1571bummer:
1572 dprintk("svc: svc_create_socket error = %d\n", -error);
1573 sock_release(sock);
1574 return ERR_PTR(error);
1575}
1576
1577/*
1578 * Detach the svc_sock from the socket so that no
1579 * more callbacks occur.
1580 */
1581static void svc_sock_detach(struct svc_xprt *xprt)
1582{
1583 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1584 struct sock *sk = svsk->sk_sk;
1585 wait_queue_head_t *wq;
1586
1587 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1588
1589 /* put back the old socket callbacks */
1590 sk->sk_state_change = svsk->sk_ostate;
1591 sk->sk_data_ready = svsk->sk_odata;
1592 sk->sk_write_space = svsk->sk_owspace;
1593
1594 wq = sk_sleep(sk);
1595 if (wq && waitqueue_active(wq))
1596 wake_up_interruptible(wq);
1597}
1598
1599/*
1600 * Disconnect the socket, and reset the callbacks
1601 */
1602static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1603{
1604 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1605
1606 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1607
1608 svc_sock_detach(xprt);
1609
1610 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1611 svc_tcp_clear_pages(svsk);
1612 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1613 }
1614}
1615
1616/*
1617 * Free the svc_sock's socket resources and the svc_sock itself.
1618 */
1619static void svc_sock_free(struct svc_xprt *xprt)
1620{
1621 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1622 dprintk("svc: svc_sock_free(%p)\n", svsk);
1623
1624 if (svsk->sk_sock->file)
1625 sockfd_put(svsk->sk_sock);
1626 else
1627 sock_release(svsk->sk_sock);
1628 kfree(svsk);
1629}
1630
1631#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1632/*
1633 * Create a back channel svc_xprt which shares the fore channel socket.
1634 */
1635static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1636 int protocol,
1637 struct net *net,
1638 struct sockaddr *sin, int len,
1639 int flags)
1640{
1641 struct svc_sock *svsk;
1642 struct svc_xprt *xprt;
1643
1644 if (protocol != IPPROTO_TCP) {
1645 printk(KERN_WARNING "svc: only TCP sockets"
1646 " supported on shared back channel\n");
1647 return ERR_PTR(-EINVAL);
1648 }
1649
1650 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1651 if (!svsk)
1652 return ERR_PTR(-ENOMEM);
1653
1654 xprt = &svsk->sk_xprt;
1655 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1656
1657 serv->sv_bc_xprt = xprt;
1658
1659 return xprt;
1660}
1661
1662/*
1663 * Free a back channel svc_sock.
1664 */
1665static void svc_bc_sock_free(struct svc_xprt *xprt)
1666{
1667 if (xprt)
1668 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1669}
1670#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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/udp.h>
43#include <net/tcp.h>
44#include <net/tcp_states.h>
45#include <linux/uaccess.h>
46#include <asm/ioctls.h>
47#include <trace/events/skb.h>
48
49#include <linux/sunrpc/types.h>
50#include <linux/sunrpc/clnt.h>
51#include <linux/sunrpc/xdr.h>
52#include <linux/sunrpc/msg_prot.h>
53#include <linux/sunrpc/svcsock.h>
54#include <linux/sunrpc/stats.h>
55#include <linux/sunrpc/xprt.h>
56
57#include "sunrpc.h"
58
59#define RPCDBG_FACILITY RPCDBG_SVCXPRT
60
61
62static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
63 int flags);
64static int svc_udp_recvfrom(struct svc_rqst *);
65static int svc_udp_sendto(struct svc_rqst *);
66static void svc_sock_detach(struct svc_xprt *);
67static void svc_tcp_sock_detach(struct svc_xprt *);
68static void svc_sock_free(struct svc_xprt *);
69
70static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
71 struct net *, struct sockaddr *,
72 int, int);
73#if defined(CONFIG_SUNRPC_BACKCHANNEL)
74static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77static void svc_bc_sock_free(struct svc_xprt *xprt);
78#endif /* CONFIG_SUNRPC_BACKCHANNEL */
79
80#ifdef CONFIG_DEBUG_LOCK_ALLOC
81static struct lock_class_key svc_key[2];
82static struct lock_class_key svc_slock_key[2];
83
84static void svc_reclassify_socket(struct socket *sock)
85{
86 struct sock *sk = sock->sk;
87
88 if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
89 return;
90
91 switch (sk->sk_family) {
92 case AF_INET:
93 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
94 &svc_slock_key[0],
95 "sk_xprt.xpt_lock-AF_INET-NFSD",
96 &svc_key[0]);
97 break;
98
99 case AF_INET6:
100 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
101 &svc_slock_key[1],
102 "sk_xprt.xpt_lock-AF_INET6-NFSD",
103 &svc_key[1]);
104 break;
105
106 default:
107 BUG();
108 }
109}
110#else
111static void svc_reclassify_socket(struct socket *sock)
112{
113}
114#endif
115
116/*
117 * Release an skbuff after use
118 */
119static void svc_release_skb(struct svc_rqst *rqstp)
120{
121 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
122
123 if (skb) {
124 struct svc_sock *svsk =
125 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
126 rqstp->rq_xprt_ctxt = NULL;
127
128 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
129 skb_free_datagram_locked(svsk->sk_sk, skb);
130 }
131}
132
133static void svc_release_udp_skb(struct svc_rqst *rqstp)
134{
135 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
136
137 if (skb) {
138 rqstp->rq_xprt_ctxt = NULL;
139
140 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
141 consume_skb(skb);
142 }
143}
144
145union svc_pktinfo_u {
146 struct in_pktinfo pkti;
147 struct in6_pktinfo pkti6;
148};
149#define SVC_PKTINFO_SPACE \
150 CMSG_SPACE(sizeof(union svc_pktinfo_u))
151
152static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
153{
154 struct svc_sock *svsk =
155 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
156 switch (svsk->sk_sk->sk_family) {
157 case AF_INET: {
158 struct in_pktinfo *pki = CMSG_DATA(cmh);
159
160 cmh->cmsg_level = SOL_IP;
161 cmh->cmsg_type = IP_PKTINFO;
162 pki->ipi_ifindex = 0;
163 pki->ipi_spec_dst.s_addr =
164 svc_daddr_in(rqstp)->sin_addr.s_addr;
165 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
166 }
167 break;
168
169 case AF_INET6: {
170 struct in6_pktinfo *pki = CMSG_DATA(cmh);
171 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
172
173 cmh->cmsg_level = SOL_IPV6;
174 cmh->cmsg_type = IPV6_PKTINFO;
175 pki->ipi6_ifindex = daddr->sin6_scope_id;
176 pki->ipi6_addr = daddr->sin6_addr;
177 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
178 }
179 break;
180 }
181}
182
183/*
184 * send routine intended to be shared by the fore- and back-channel
185 */
186int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
187 struct page *headpage, unsigned long headoffset,
188 struct page *tailpage, unsigned long tailoffset)
189{
190 int result;
191 int size;
192 struct page **ppage = xdr->pages;
193 size_t base = xdr->page_base;
194 unsigned int pglen = xdr->page_len;
195 unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST;
196 int slen;
197 int len = 0;
198
199 slen = xdr->len;
200
201 /* send head */
202 if (slen == xdr->head[0].iov_len)
203 flags = 0;
204 len = kernel_sendpage(sock, headpage, headoffset,
205 xdr->head[0].iov_len, flags);
206 if (len != xdr->head[0].iov_len)
207 goto out;
208 slen -= xdr->head[0].iov_len;
209 if (slen == 0)
210 goto out;
211
212 /* send page data */
213 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
214 while (pglen > 0) {
215 if (slen == size)
216 flags = 0;
217 result = kernel_sendpage(sock, *ppage, base, size, flags);
218 if (result > 0)
219 len += result;
220 if (result != size)
221 goto out;
222 slen -= size;
223 pglen -= size;
224 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
225 base = 0;
226 ppage++;
227 }
228
229 /* send tail */
230 if (xdr->tail[0].iov_len) {
231 result = kernel_sendpage(sock, tailpage, tailoffset,
232 xdr->tail[0].iov_len, 0);
233 if (result > 0)
234 len += result;
235 }
236
237out:
238 return len;
239}
240
241
242/*
243 * Generic sendto routine
244 */
245static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
246{
247 struct svc_sock *svsk =
248 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
249 struct socket *sock = svsk->sk_sock;
250 union {
251 struct cmsghdr hdr;
252 long all[SVC_PKTINFO_SPACE / sizeof(long)];
253 } buffer;
254 struct cmsghdr *cmh = &buffer.hdr;
255 int len = 0;
256 unsigned long tailoff;
257 unsigned long headoff;
258 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
259
260 if (rqstp->rq_prot == IPPROTO_UDP) {
261 struct msghdr msg = {
262 .msg_name = &rqstp->rq_addr,
263 .msg_namelen = rqstp->rq_addrlen,
264 .msg_control = cmh,
265 .msg_controllen = sizeof(buffer),
266 .msg_flags = MSG_MORE,
267 };
268
269 svc_set_cmsg_data(rqstp, cmh);
270
271 if (sock_sendmsg(sock, &msg) < 0)
272 goto out;
273 }
274
275 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
276 headoff = 0;
277 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
278 rqstp->rq_respages[0], tailoff);
279
280out:
281 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
282 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
283 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
284
285 return len;
286}
287
288/*
289 * Report socket names for nfsdfs
290 */
291static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
292{
293 const struct sock *sk = svsk->sk_sk;
294 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
295 "udp" : "tcp";
296 int len;
297
298 switch (sk->sk_family) {
299 case PF_INET:
300 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
301 proto_name,
302 &inet_sk(sk)->inet_rcv_saddr,
303 inet_sk(sk)->inet_num);
304 break;
305#if IS_ENABLED(CONFIG_IPV6)
306 case PF_INET6:
307 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
308 proto_name,
309 &sk->sk_v6_rcv_saddr,
310 inet_sk(sk)->inet_num);
311 break;
312#endif
313 default:
314 len = snprintf(buf, remaining, "*unknown-%d*\n",
315 sk->sk_family);
316 }
317
318 if (len >= remaining) {
319 *buf = '\0';
320 return -ENAMETOOLONG;
321 }
322 return len;
323}
324
325/*
326 * Generic recvfrom routine.
327 */
328static 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 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
341 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
342 msg.msg_flags);
343 /* If we read a full record, then assume there may be more
344 * data to read (stream based sockets only!)
345 */
346 if (len == buflen)
347 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
348
349 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
350 svsk, iov[0].iov_base, iov[0].iov_len, len);
351 return len;
352}
353
354static int svc_partial_recvfrom(struct svc_rqst *rqstp,
355 struct kvec *iov, int nr,
356 int buflen, unsigned int base)
357{
358 size_t save_iovlen;
359 void *save_iovbase;
360 unsigned int i;
361 int ret;
362
363 if (base == 0)
364 return svc_recvfrom(rqstp, iov, nr, buflen);
365
366 for (i = 0; i < nr; i++) {
367 if (iov[i].iov_len > base)
368 break;
369 base -= iov[i].iov_len;
370 }
371 save_iovlen = iov[i].iov_len;
372 save_iovbase = iov[i].iov_base;
373 iov[i].iov_len -= base;
374 iov[i].iov_base += base;
375 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
376 iov[i].iov_len = save_iovlen;
377 iov[i].iov_base = save_iovbase;
378 return ret;
379}
380
381/*
382 * Set socket snd and rcv buffer lengths
383 */
384static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
385 unsigned int rcv)
386{
387#if 0
388 mm_segment_t oldfs;
389 oldfs = get_fs(); set_fs(KERNEL_DS);
390 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
391 (char*)&snd, sizeof(snd));
392 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
393 (char*)&rcv, sizeof(rcv));
394#else
395 /* sock_setsockopt limits use to sysctl_?mem_max,
396 * which isn't acceptable. Until that is made conditional
397 * on not having CAP_SYS_RESOURCE or similar, we go direct...
398 * DaveM said I could!
399 */
400 lock_sock(sock->sk);
401 sock->sk->sk_sndbuf = snd * 2;
402 sock->sk->sk_rcvbuf = rcv * 2;
403 sock->sk->sk_write_space(sock->sk);
404 release_sock(sock->sk);
405#endif
406}
407
408static int svc_sock_secure_port(struct svc_rqst *rqstp)
409{
410 return svc_port_is_privileged(svc_addr(rqstp));
411}
412
413/*
414 * INET callback when data has been received on the socket.
415 */
416static void svc_data_ready(struct sock *sk)
417{
418 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
419
420 if (svsk) {
421 dprintk("svc: socket %p(inet %p), busy=%d\n",
422 svsk, sk,
423 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
424 svsk->sk_odata(sk);
425 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
426 svc_xprt_enqueue(&svsk->sk_xprt);
427 }
428}
429
430/*
431 * INET callback when space is newly available on the socket.
432 */
433static void svc_write_space(struct sock *sk)
434{
435 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
436
437 if (svsk) {
438 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
439 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
440 svsk->sk_owspace(sk);
441 svc_xprt_enqueue(&svsk->sk_xprt);
442 }
443}
444
445static int svc_tcp_has_wspace(struct svc_xprt *xprt)
446{
447 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
448
449 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
450 return 1;
451 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
452}
453
454static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
455{
456 struct svc_sock *svsk;
457 struct socket *sock;
458 struct linger no_linger = {
459 .l_onoff = 1,
460 .l_linger = 0,
461 };
462
463 svsk = container_of(xprt, struct svc_sock, sk_xprt);
464 sock = svsk->sk_sock;
465 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
466 (char *)&no_linger, sizeof(no_linger));
467}
468
469/*
470 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
471 */
472static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
473 struct cmsghdr *cmh)
474{
475 struct in_pktinfo *pki = CMSG_DATA(cmh);
476 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
477
478 if (cmh->cmsg_type != IP_PKTINFO)
479 return 0;
480
481 daddr->sin_family = AF_INET;
482 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
483 return 1;
484}
485
486/*
487 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
488 */
489static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
490 struct cmsghdr *cmh)
491{
492 struct in6_pktinfo *pki = CMSG_DATA(cmh);
493 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
494
495 if (cmh->cmsg_type != IPV6_PKTINFO)
496 return 0;
497
498 daddr->sin6_family = AF_INET6;
499 daddr->sin6_addr = pki->ipi6_addr;
500 daddr->sin6_scope_id = pki->ipi6_ifindex;
501 return 1;
502}
503
504/*
505 * Copy the UDP datagram's destination address to the rqstp structure.
506 * The 'destination' address in this case is the address to which the
507 * peer sent the datagram, i.e. our local address. For multihomed
508 * hosts, this can change from msg to msg. Note that only the IP
509 * address changes, the port number should remain the same.
510 */
511static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
512 struct cmsghdr *cmh)
513{
514 switch (cmh->cmsg_level) {
515 case SOL_IP:
516 return svc_udp_get_dest_address4(rqstp, cmh);
517 case SOL_IPV6:
518 return svc_udp_get_dest_address6(rqstp, cmh);
519 }
520
521 return 0;
522}
523
524/*
525 * Receive a datagram from a UDP socket.
526 */
527static int svc_udp_recvfrom(struct svc_rqst *rqstp)
528{
529 struct svc_sock *svsk =
530 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
531 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
532 struct sk_buff *skb;
533 union {
534 struct cmsghdr hdr;
535 long all[SVC_PKTINFO_SPACE / sizeof(long)];
536 } buffer;
537 struct cmsghdr *cmh = &buffer.hdr;
538 struct msghdr msg = {
539 .msg_name = svc_addr(rqstp),
540 .msg_control = cmh,
541 .msg_controllen = sizeof(buffer),
542 .msg_flags = MSG_DONTWAIT,
543 };
544 size_t len;
545 int err;
546
547 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
548 /* udp sockets need large rcvbuf as all pending
549 * requests are still in that buffer. sndbuf must
550 * also be large enough that there is enough space
551 * for one reply per thread. We count all threads
552 * rather than threads in a particular pool, which
553 * provides an upper bound on the number of threads
554 * which will access the socket.
555 */
556 svc_sock_setbufsize(svsk->sk_sock,
557 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
558 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
559
560 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
561 skb = NULL;
562 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
563 0, 0, MSG_PEEK | MSG_DONTWAIT);
564 if (err >= 0)
565 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
566
567 if (skb == NULL) {
568 if (err != -EAGAIN) {
569 /* possibly an icmp error */
570 dprintk("svc: recvfrom returned error %d\n", -err);
571 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
572 }
573 return 0;
574 }
575 len = svc_addr_len(svc_addr(rqstp));
576 rqstp->rq_addrlen = len;
577 if (skb->tstamp == 0) {
578 skb->tstamp = ktime_get_real();
579 /* Don't enable netstamp, sunrpc doesn't
580 need that much accuracy */
581 }
582 svsk->sk_sk->sk_stamp = skb->tstamp;
583 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
584
585 len = skb->len;
586 rqstp->rq_arg.len = len;
587
588 rqstp->rq_prot = IPPROTO_UDP;
589
590 if (!svc_udp_get_dest_address(rqstp, cmh)) {
591 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
592 cmh->cmsg_level, cmh->cmsg_type);
593 goto out_free;
594 }
595 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
596
597 if (skb_is_nonlinear(skb)) {
598 /* we have to copy */
599 local_bh_disable();
600 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
601 local_bh_enable();
602 /* checksum error */
603 goto out_free;
604 }
605 local_bh_enable();
606 consume_skb(skb);
607 } else {
608 /* we can use it in-place */
609 rqstp->rq_arg.head[0].iov_base = skb->data;
610 rqstp->rq_arg.head[0].iov_len = len;
611 if (skb_checksum_complete(skb))
612 goto out_free;
613 rqstp->rq_xprt_ctxt = skb;
614 }
615
616 rqstp->rq_arg.page_base = 0;
617 if (len <= rqstp->rq_arg.head[0].iov_len) {
618 rqstp->rq_arg.head[0].iov_len = len;
619 rqstp->rq_arg.page_len = 0;
620 rqstp->rq_respages = rqstp->rq_pages+1;
621 } else {
622 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
623 rqstp->rq_respages = rqstp->rq_pages + 1 +
624 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
625 }
626 rqstp->rq_next_page = rqstp->rq_respages+1;
627
628 if (serv->sv_stats)
629 serv->sv_stats->netudpcnt++;
630
631 return len;
632out_free:
633 kfree_skb(skb);
634 return 0;
635}
636
637static int
638svc_udp_sendto(struct svc_rqst *rqstp)
639{
640 int error;
641
642 error = svc_sendto(rqstp, &rqstp->rq_res);
643 if (error == -ECONNREFUSED)
644 /* ICMP error on earlier request. */
645 error = svc_sendto(rqstp, &rqstp->rq_res);
646
647 return error;
648}
649
650static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
651{
652}
653
654static int svc_udp_has_wspace(struct svc_xprt *xprt)
655{
656 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
657 struct svc_serv *serv = xprt->xpt_server;
658 unsigned long required;
659
660 /*
661 * Set the SOCK_NOSPACE flag before checking the available
662 * sock space.
663 */
664 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
665 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
666 if (required*2 > sock_wspace(svsk->sk_sk))
667 return 0;
668 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
669 return 1;
670}
671
672static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
673{
674 BUG();
675 return NULL;
676}
677
678static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
679{
680}
681
682static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
683 struct net *net,
684 struct sockaddr *sa, int salen,
685 int flags)
686{
687 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
688}
689
690static struct svc_xprt_ops svc_udp_ops = {
691 .xpo_create = svc_udp_create,
692 .xpo_recvfrom = svc_udp_recvfrom,
693 .xpo_sendto = svc_udp_sendto,
694 .xpo_release_rqst = svc_release_udp_skb,
695 .xpo_detach = svc_sock_detach,
696 .xpo_free = svc_sock_free,
697 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
698 .xpo_has_wspace = svc_udp_has_wspace,
699 .xpo_accept = svc_udp_accept,
700 .xpo_secure_port = svc_sock_secure_port,
701 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
702};
703
704static struct svc_xprt_class svc_udp_class = {
705 .xcl_name = "udp",
706 .xcl_owner = THIS_MODULE,
707 .xcl_ops = &svc_udp_ops,
708 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
709 .xcl_ident = XPRT_TRANSPORT_UDP,
710};
711
712static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
713{
714 int err, level, optname, one = 1;
715
716 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
717 &svsk->sk_xprt, serv);
718 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
719 svsk->sk_sk->sk_data_ready = svc_data_ready;
720 svsk->sk_sk->sk_write_space = svc_write_space;
721
722 /* initialise setting must have enough space to
723 * receive and respond to one request.
724 * svc_udp_recvfrom will re-adjust if necessary
725 */
726 svc_sock_setbufsize(svsk->sk_sock,
727 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
728 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
729
730 /* data might have come in before data_ready set up */
731 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
732 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
733
734 /* make sure we get destination address info */
735 switch (svsk->sk_sk->sk_family) {
736 case AF_INET:
737 level = SOL_IP;
738 optname = IP_PKTINFO;
739 break;
740 case AF_INET6:
741 level = SOL_IPV6;
742 optname = IPV6_RECVPKTINFO;
743 break;
744 default:
745 BUG();
746 }
747 err = kernel_setsockopt(svsk->sk_sock, level, optname,
748 (char *)&one, sizeof(one));
749 dprintk("svc: kernel_setsockopt returned %d\n", err);
750}
751
752/*
753 * A data_ready event on a listening socket means there's a connection
754 * pending. Do not use state_change as a substitute for it.
755 */
756static void svc_tcp_listen_data_ready(struct sock *sk)
757{
758 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
759
760 dprintk("svc: socket %p TCP (listen) state change %d\n",
761 sk, sk->sk_state);
762
763 if (svsk)
764 svsk->sk_odata(sk);
765 /*
766 * This callback may called twice when a new connection
767 * is established as a child socket inherits everything
768 * from a parent LISTEN socket.
769 * 1) data_ready method of the parent socket will be called
770 * when one of child sockets become ESTABLISHED.
771 * 2) data_ready method of the child socket may be called
772 * when it receives data before the socket is accepted.
773 * In case of 2, we should ignore it silently.
774 */
775 if (sk->sk_state == TCP_LISTEN) {
776 if (svsk) {
777 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
778 svc_xprt_enqueue(&svsk->sk_xprt);
779 } else
780 printk("svc: socket %p: no user data\n", sk);
781 }
782}
783
784/*
785 * A state change on a connected socket means it's dying or dead.
786 */
787static void svc_tcp_state_change(struct sock *sk)
788{
789 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
790
791 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
792 sk, sk->sk_state, sk->sk_user_data);
793
794 if (!svsk)
795 printk("svc: socket %p: no user data\n", sk);
796 else {
797 svsk->sk_ostate(sk);
798 if (sk->sk_state != TCP_ESTABLISHED) {
799 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
800 svc_xprt_enqueue(&svsk->sk_xprt);
801 }
802 }
803}
804
805/*
806 * Accept a TCP connection
807 */
808static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
809{
810 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
811 struct sockaddr_storage addr;
812 struct sockaddr *sin = (struct sockaddr *) &addr;
813 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
814 struct socket *sock = svsk->sk_sock;
815 struct socket *newsock;
816 struct svc_sock *newsvsk;
817 int err, slen;
818 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
819
820 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
821 if (!sock)
822 return NULL;
823
824 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
825 err = kernel_accept(sock, &newsock, O_NONBLOCK);
826 if (err < 0) {
827 if (err == -ENOMEM)
828 printk(KERN_WARNING "%s: no more sockets!\n",
829 serv->sv_name);
830 else if (err != -EAGAIN)
831 net_warn_ratelimited("%s: accept failed (err %d)!\n",
832 serv->sv_name, -err);
833 return NULL;
834 }
835 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
836
837 err = kernel_getpeername(newsock, sin, &slen);
838 if (err < 0) {
839 net_warn_ratelimited("%s: peername failed (err %d)!\n",
840 serv->sv_name, -err);
841 goto failed; /* aborted connection or whatever */
842 }
843
844 /* Ideally, we would want to reject connections from unauthorized
845 * hosts here, but when we get encryption, the IP of the host won't
846 * tell us anything. For now just warn about unpriv connections.
847 */
848 if (!svc_port_is_privileged(sin)) {
849 dprintk("%s: connect from unprivileged port: %s\n",
850 serv->sv_name,
851 __svc_print_addr(sin, buf, sizeof(buf)));
852 }
853 dprintk("%s: connect from %s\n", serv->sv_name,
854 __svc_print_addr(sin, buf, sizeof(buf)));
855
856 /* Reset the inherited callbacks before calling svc_setup_socket */
857 newsock->sk->sk_state_change = svsk->sk_ostate;
858 newsock->sk->sk_data_ready = svsk->sk_odata;
859 newsock->sk->sk_write_space = svsk->sk_owspace;
860
861 /* make sure that a write doesn't block forever when
862 * low on memory
863 */
864 newsock->sk->sk_sndtimeo = HZ*30;
865
866 newsvsk = svc_setup_socket(serv, newsock,
867 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
868 if (IS_ERR(newsvsk))
869 goto failed;
870 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
871 err = kernel_getsockname(newsock, sin, &slen);
872 if (unlikely(err < 0)) {
873 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
874 slen = offsetof(struct sockaddr, sa_data);
875 }
876 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
877
878 if (sock_is_loopback(newsock->sk))
879 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
880 else
881 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
882 if (serv->sv_stats)
883 serv->sv_stats->nettcpconn++;
884
885 return &newsvsk->sk_xprt;
886
887failed:
888 sock_release(newsock);
889 return NULL;
890}
891
892static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
893{
894 unsigned int i, len, npages;
895
896 if (svsk->sk_datalen == 0)
897 return 0;
898 len = svsk->sk_datalen;
899 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
900 for (i = 0; i < npages; i++) {
901 if (rqstp->rq_pages[i] != NULL)
902 put_page(rqstp->rq_pages[i]);
903 BUG_ON(svsk->sk_pages[i] == NULL);
904 rqstp->rq_pages[i] = svsk->sk_pages[i];
905 svsk->sk_pages[i] = NULL;
906 }
907 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
908 return len;
909}
910
911static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
912{
913 unsigned int i, len, npages;
914
915 if (svsk->sk_datalen == 0)
916 return;
917 len = svsk->sk_datalen;
918 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
919 for (i = 0; i < npages; i++) {
920 svsk->sk_pages[i] = rqstp->rq_pages[i];
921 rqstp->rq_pages[i] = NULL;
922 }
923}
924
925static void svc_tcp_clear_pages(struct svc_sock *svsk)
926{
927 unsigned int i, len, npages;
928
929 if (svsk->sk_datalen == 0)
930 goto out;
931 len = svsk->sk_datalen;
932 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
933 for (i = 0; i < npages; i++) {
934 if (svsk->sk_pages[i] == NULL) {
935 WARN_ON_ONCE(1);
936 continue;
937 }
938 put_page(svsk->sk_pages[i]);
939 svsk->sk_pages[i] = NULL;
940 }
941out:
942 svsk->sk_tcplen = 0;
943 svsk->sk_datalen = 0;
944}
945
946/*
947 * Receive fragment record header.
948 * If we haven't gotten the record length yet, get the next four bytes.
949 */
950static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
951{
952 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
953 unsigned int want;
954 int len;
955
956 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
957 struct kvec iov;
958
959 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
960 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
961 iov.iov_len = want;
962 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
963 goto error;
964 svsk->sk_tcplen += len;
965
966 if (len < want) {
967 dprintk("svc: short recvfrom while reading record "
968 "length (%d of %d)\n", len, want);
969 return -EAGAIN;
970 }
971
972 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
973 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
974 serv->sv_max_mesg) {
975 net_notice_ratelimited("RPC: fragment too large: %d\n",
976 svc_sock_reclen(svsk));
977 goto err_delete;
978 }
979 }
980
981 return svc_sock_reclen(svsk);
982error:
983 dprintk("RPC: TCP recv_record got %d\n", len);
984 return len;
985err_delete:
986 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
987 return -EAGAIN;
988}
989
990static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
991{
992 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
993 struct rpc_rqst *req = NULL;
994 struct kvec *src, *dst;
995 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
996 __be32 xid;
997 __be32 calldir;
998
999 xid = *p++;
1000 calldir = *p;
1001
1002 if (!bc_xprt)
1003 return -EAGAIN;
1004 spin_lock_bh(&bc_xprt->transport_lock);
1005 req = xprt_lookup_rqst(bc_xprt, xid);
1006 if (!req)
1007 goto unlock_notfound;
1008
1009 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1010 /*
1011 * XXX!: cheating for now! Only copying HEAD.
1012 * But we know this is good enough for now (in fact, for any
1013 * callback reply in the forseeable future).
1014 */
1015 dst = &req->rq_private_buf.head[0];
1016 src = &rqstp->rq_arg.head[0];
1017 if (dst->iov_len < src->iov_len)
1018 goto unlock_eagain; /* whatever; just giving up. */
1019 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1020 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1021 rqstp->rq_arg.len = 0;
1022 spin_unlock_bh(&bc_xprt->transport_lock);
1023 return 0;
1024unlock_notfound:
1025 printk(KERN_NOTICE
1026 "%s: Got unrecognized reply: "
1027 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1028 __func__, ntohl(calldir),
1029 bc_xprt, ntohl(xid));
1030unlock_eagain:
1031 spin_unlock_bh(&bc_xprt->transport_lock);
1032 return -EAGAIN;
1033}
1034
1035static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1036{
1037 int i = 0;
1038 int t = 0;
1039
1040 while (t < len) {
1041 vec[i].iov_base = page_address(pages[i]);
1042 vec[i].iov_len = PAGE_SIZE;
1043 i++;
1044 t += PAGE_SIZE;
1045 }
1046 return i;
1047}
1048
1049static void svc_tcp_fragment_received(struct svc_sock *svsk)
1050{
1051 /* If we have more data, signal svc_xprt_enqueue() to try again */
1052 dprintk("svc: TCP %s record (%d bytes)\n",
1053 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1054 svc_sock_reclen(svsk));
1055 svsk->sk_tcplen = 0;
1056 svsk->sk_reclen = 0;
1057}
1058
1059/*
1060 * Receive data from a TCP socket.
1061 */
1062static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1063{
1064 struct svc_sock *svsk =
1065 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1066 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1067 int len;
1068 struct kvec *vec;
1069 unsigned int want, base;
1070 __be32 *p;
1071 __be32 calldir;
1072 int pnum;
1073
1074 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1075 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1076 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1077 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1078
1079 len = svc_tcp_recv_record(svsk, rqstp);
1080 if (len < 0)
1081 goto error;
1082
1083 base = svc_tcp_restore_pages(svsk, rqstp);
1084 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1085
1086 vec = rqstp->rq_vec;
1087
1088 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1089 svsk->sk_datalen + want);
1090
1091 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1092 rqstp->rq_next_page = rqstp->rq_respages + 1;
1093
1094 /* Now receive data */
1095 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1096 if (len >= 0) {
1097 svsk->sk_tcplen += len;
1098 svsk->sk_datalen += len;
1099 }
1100 if (len != want || !svc_sock_final_rec(svsk)) {
1101 svc_tcp_save_pages(svsk, rqstp);
1102 if (len < 0 && len != -EAGAIN)
1103 goto err_delete;
1104 if (len == want)
1105 svc_tcp_fragment_received(svsk);
1106 else
1107 dprintk("svc: incomplete TCP record (%d of %d)\n",
1108 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1109 svc_sock_reclen(svsk));
1110 goto err_noclose;
1111 }
1112
1113 if (svsk->sk_datalen < 8) {
1114 svsk->sk_datalen = 0;
1115 goto err_delete; /* client is nuts. */
1116 }
1117
1118 rqstp->rq_arg.len = svsk->sk_datalen;
1119 rqstp->rq_arg.page_base = 0;
1120 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1121 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1122 rqstp->rq_arg.page_len = 0;
1123 } else
1124 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1125
1126 rqstp->rq_xprt_ctxt = NULL;
1127 rqstp->rq_prot = IPPROTO_TCP;
1128 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1129 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1130 else
1131 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1132
1133 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1134 calldir = p[1];
1135 if (calldir)
1136 len = receive_cb_reply(svsk, rqstp);
1137
1138 /* Reset TCP read info */
1139 svsk->sk_datalen = 0;
1140 svc_tcp_fragment_received(svsk);
1141
1142 if (len < 0)
1143 goto error;
1144
1145 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1146 if (serv->sv_stats)
1147 serv->sv_stats->nettcpcnt++;
1148
1149 return rqstp->rq_arg.len;
1150
1151error:
1152 if (len != -EAGAIN)
1153 goto err_delete;
1154 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1155 return 0;
1156err_delete:
1157 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1158 svsk->sk_xprt.xpt_server->sv_name, -len);
1159 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1160err_noclose:
1161 return 0; /* record not complete */
1162}
1163
1164/*
1165 * Send out data on TCP socket.
1166 */
1167static int svc_tcp_sendto(struct svc_rqst *rqstp)
1168{
1169 struct xdr_buf *xbufp = &rqstp->rq_res;
1170 int sent;
1171 __be32 reclen;
1172
1173 /* Set up the first element of the reply kvec.
1174 * Any other kvecs that may be in use have been taken
1175 * care of by the server implementation itself.
1176 */
1177 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1178 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1179
1180 sent = svc_sendto(rqstp, &rqstp->rq_res);
1181 if (sent != xbufp->len) {
1182 printk(KERN_NOTICE
1183 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1184 "- shutting down socket\n",
1185 rqstp->rq_xprt->xpt_server->sv_name,
1186 (sent<0)?"got error":"sent only",
1187 sent, xbufp->len);
1188 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1189 svc_xprt_enqueue(rqstp->rq_xprt);
1190 sent = -EAGAIN;
1191 }
1192 return sent;
1193}
1194
1195/*
1196 * Setup response header. TCP has a 4B record length field.
1197 */
1198static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1199{
1200 struct kvec *resv = &rqstp->rq_res.head[0];
1201
1202 /* tcp needs a space for the record length... */
1203 svc_putnl(resv, 0);
1204}
1205
1206static 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)
1215static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1216 struct net *, struct sockaddr *,
1217 int, int);
1218static void svc_bc_sock_free(struct svc_xprt *xprt);
1219
1220static 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
1228static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1229{
1230}
1231
1232static 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 .xpo_secure_port = svc_sock_secure_port,
1238};
1239
1240static struct svc_xprt_class svc_tcp_bc_class = {
1241 .xcl_name = "tcp-bc",
1242 .xcl_owner = THIS_MODULE,
1243 .xcl_ops = &svc_tcp_bc_ops,
1244 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1245};
1246
1247static void svc_init_bc_xprt_sock(void)
1248{
1249 svc_reg_xprt_class(&svc_tcp_bc_class);
1250}
1251
1252static void svc_cleanup_bc_xprt_sock(void)
1253{
1254 svc_unreg_xprt_class(&svc_tcp_bc_class);
1255}
1256#else /* CONFIG_SUNRPC_BACKCHANNEL */
1257static void svc_init_bc_xprt_sock(void)
1258{
1259}
1260
1261static void svc_cleanup_bc_xprt_sock(void)
1262{
1263}
1264#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1265
1266static struct svc_xprt_ops svc_tcp_ops = {
1267 .xpo_create = svc_tcp_create,
1268 .xpo_recvfrom = svc_tcp_recvfrom,
1269 .xpo_sendto = svc_tcp_sendto,
1270 .xpo_release_rqst = svc_release_skb,
1271 .xpo_detach = svc_tcp_sock_detach,
1272 .xpo_free = svc_sock_free,
1273 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1274 .xpo_has_wspace = svc_tcp_has_wspace,
1275 .xpo_accept = svc_tcp_accept,
1276 .xpo_secure_port = svc_sock_secure_port,
1277 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1278};
1279
1280static struct svc_xprt_class svc_tcp_class = {
1281 .xcl_name = "tcp",
1282 .xcl_owner = THIS_MODULE,
1283 .xcl_ops = &svc_tcp_ops,
1284 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1285 .xcl_ident = XPRT_TRANSPORT_TCP,
1286};
1287
1288void svc_init_xprt_sock(void)
1289{
1290 svc_reg_xprt_class(&svc_tcp_class);
1291 svc_reg_xprt_class(&svc_udp_class);
1292 svc_init_bc_xprt_sock();
1293}
1294
1295void svc_cleanup_xprt_sock(void)
1296{
1297 svc_unreg_xprt_class(&svc_tcp_class);
1298 svc_unreg_xprt_class(&svc_udp_class);
1299 svc_cleanup_bc_xprt_sock();
1300}
1301
1302static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1303{
1304 struct sock *sk = svsk->sk_sk;
1305
1306 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1307 &svsk->sk_xprt, serv);
1308 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1309 if (sk->sk_state == TCP_LISTEN) {
1310 dprintk("setting up TCP socket for listening\n");
1311 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1312 sk->sk_data_ready = svc_tcp_listen_data_ready;
1313 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1314 } else {
1315 dprintk("setting up TCP socket for reading\n");
1316 sk->sk_state_change = svc_tcp_state_change;
1317 sk->sk_data_ready = svc_data_ready;
1318 sk->sk_write_space = svc_write_space;
1319
1320 svsk->sk_reclen = 0;
1321 svsk->sk_tcplen = 0;
1322 svsk->sk_datalen = 0;
1323 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1324
1325 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1326
1327 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1328 switch (sk->sk_state) {
1329 case TCP_SYN_RECV:
1330 case TCP_ESTABLISHED:
1331 break;
1332 default:
1333 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1334 }
1335 }
1336}
1337
1338void svc_sock_update_bufs(struct svc_serv *serv)
1339{
1340 /*
1341 * The number of server threads has changed. Update
1342 * rcvbuf and sndbuf accordingly on all sockets
1343 */
1344 struct svc_sock *svsk;
1345
1346 spin_lock_bh(&serv->sv_lock);
1347 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1348 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1349 spin_unlock_bh(&serv->sv_lock);
1350}
1351EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1352
1353/*
1354 * Initialize socket for RPC use and create svc_sock struct
1355 */
1356static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1357 struct socket *sock,
1358 int flags)
1359{
1360 struct svc_sock *svsk;
1361 struct sock *inet;
1362 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1363 int err = 0;
1364
1365 dprintk("svc: svc_setup_socket %p\n", sock);
1366 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1367 if (!svsk)
1368 return ERR_PTR(-ENOMEM);
1369
1370 inet = sock->sk;
1371
1372 /* Register socket with portmapper */
1373 if (pmap_register)
1374 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1375 inet->sk_protocol,
1376 ntohs(inet_sk(inet)->inet_sport));
1377
1378 if (err < 0) {
1379 kfree(svsk);
1380 return ERR_PTR(err);
1381 }
1382
1383 inet->sk_user_data = svsk;
1384 svsk->sk_sock = sock;
1385 svsk->sk_sk = inet;
1386 svsk->sk_ostate = inet->sk_state_change;
1387 svsk->sk_odata = inet->sk_data_ready;
1388 svsk->sk_owspace = inet->sk_write_space;
1389
1390 /* Initialize the socket */
1391 if (sock->type == SOCK_DGRAM)
1392 svc_udp_init(svsk, serv);
1393 else
1394 svc_tcp_init(svsk, serv);
1395
1396 dprintk("svc: svc_setup_socket created %p (inet %p), "
1397 "listen %d close %d\n",
1398 svsk, svsk->sk_sk,
1399 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1400 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1401
1402 return svsk;
1403}
1404
1405bool svc_alien_sock(struct net *net, int fd)
1406{
1407 int err;
1408 struct socket *sock = sockfd_lookup(fd, &err);
1409 bool ret = false;
1410
1411 if (!sock)
1412 goto out;
1413 if (sock_net(sock->sk) != net)
1414 ret = true;
1415 sockfd_put(sock);
1416out:
1417 return ret;
1418}
1419EXPORT_SYMBOL_GPL(svc_alien_sock);
1420
1421/**
1422 * svc_addsock - add a listener socket to an RPC service
1423 * @serv: pointer to RPC service to which to add a new listener
1424 * @fd: file descriptor of the new listener
1425 * @name_return: pointer to buffer to fill in with name of listener
1426 * @len: size of the buffer
1427 *
1428 * Fills in socket name and returns positive length of name if successful.
1429 * Name is terminated with '\n'. On error, returns a negative errno
1430 * value.
1431 */
1432int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1433 const size_t len)
1434{
1435 int err = 0;
1436 struct socket *so = sockfd_lookup(fd, &err);
1437 struct svc_sock *svsk = NULL;
1438 struct sockaddr_storage addr;
1439 struct sockaddr *sin = (struct sockaddr *)&addr;
1440 int salen;
1441
1442 if (!so)
1443 return err;
1444 err = -EAFNOSUPPORT;
1445 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1446 goto out;
1447 err = -EPROTONOSUPPORT;
1448 if (so->sk->sk_protocol != IPPROTO_TCP &&
1449 so->sk->sk_protocol != IPPROTO_UDP)
1450 goto out;
1451 err = -EISCONN;
1452 if (so->state > SS_UNCONNECTED)
1453 goto out;
1454 err = -ENOENT;
1455 if (!try_module_get(THIS_MODULE))
1456 goto out;
1457 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1458 if (IS_ERR(svsk)) {
1459 module_put(THIS_MODULE);
1460 err = PTR_ERR(svsk);
1461 goto out;
1462 }
1463 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1464 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1465 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1466 return svc_one_sock_name(svsk, name_return, len);
1467out:
1468 sockfd_put(so);
1469 return err;
1470}
1471EXPORT_SYMBOL_GPL(svc_addsock);
1472
1473/*
1474 * Create socket for RPC service.
1475 */
1476static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1477 int protocol,
1478 struct net *net,
1479 struct sockaddr *sin, int len,
1480 int flags)
1481{
1482 struct svc_sock *svsk;
1483 struct socket *sock;
1484 int error;
1485 int type;
1486 struct sockaddr_storage addr;
1487 struct sockaddr *newsin = (struct sockaddr *)&addr;
1488 int newlen;
1489 int family;
1490 int val;
1491 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1492
1493 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1494 serv->sv_program->pg_name, protocol,
1495 __svc_print_addr(sin, buf, sizeof(buf)));
1496
1497 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1498 printk(KERN_WARNING "svc: only UDP and TCP "
1499 "sockets supported\n");
1500 return ERR_PTR(-EINVAL);
1501 }
1502
1503 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1504 switch (sin->sa_family) {
1505 case AF_INET6:
1506 family = PF_INET6;
1507 break;
1508 case AF_INET:
1509 family = PF_INET;
1510 break;
1511 default:
1512 return ERR_PTR(-EINVAL);
1513 }
1514
1515 error = __sock_create(net, family, type, protocol, &sock, 1);
1516 if (error < 0)
1517 return ERR_PTR(error);
1518
1519 svc_reclassify_socket(sock);
1520
1521 /*
1522 * If this is an PF_INET6 listener, we want to avoid
1523 * getting requests from IPv4 remotes. Those should
1524 * be shunted to a PF_INET listener via rpcbind.
1525 */
1526 val = 1;
1527 if (family == PF_INET6)
1528 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1529 (char *)&val, sizeof(val));
1530
1531 if (type == SOCK_STREAM)
1532 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1533 error = kernel_bind(sock, sin, len);
1534 if (error < 0)
1535 goto bummer;
1536
1537 newlen = len;
1538 error = kernel_getsockname(sock, newsin, &newlen);
1539 if (error < 0)
1540 goto bummer;
1541
1542 if (protocol == IPPROTO_TCP) {
1543 if ((error = kernel_listen(sock, 64)) < 0)
1544 goto bummer;
1545 }
1546
1547 svsk = svc_setup_socket(serv, sock, flags);
1548 if (IS_ERR(svsk)) {
1549 error = PTR_ERR(svsk);
1550 goto bummer;
1551 }
1552 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1553 return (struct svc_xprt *)svsk;
1554bummer:
1555 dprintk("svc: svc_create_socket error = %d\n", -error);
1556 sock_release(sock);
1557 return ERR_PTR(error);
1558}
1559
1560/*
1561 * Detach the svc_sock from the socket so that no
1562 * more callbacks occur.
1563 */
1564static void svc_sock_detach(struct svc_xprt *xprt)
1565{
1566 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1567 struct sock *sk = svsk->sk_sk;
1568
1569 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1570
1571 /* put back the old socket callbacks */
1572 lock_sock(sk);
1573 sk->sk_state_change = svsk->sk_ostate;
1574 sk->sk_data_ready = svsk->sk_odata;
1575 sk->sk_write_space = svsk->sk_owspace;
1576 sk->sk_user_data = NULL;
1577 release_sock(sk);
1578}
1579
1580/*
1581 * Disconnect the socket, and reset the callbacks
1582 */
1583static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1584{
1585 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1586
1587 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1588
1589 svc_sock_detach(xprt);
1590
1591 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1592 svc_tcp_clear_pages(svsk);
1593 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1594 }
1595}
1596
1597/*
1598 * Free the svc_sock's socket resources and the svc_sock itself.
1599 */
1600static void svc_sock_free(struct svc_xprt *xprt)
1601{
1602 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1603 dprintk("svc: svc_sock_free(%p)\n", svsk);
1604
1605 if (svsk->sk_sock->file)
1606 sockfd_put(svsk->sk_sock);
1607 else
1608 sock_release(svsk->sk_sock);
1609 kfree(svsk);
1610}
1611
1612#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1613/*
1614 * Create a back channel svc_xprt which shares the fore channel socket.
1615 */
1616static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1617 int protocol,
1618 struct net *net,
1619 struct sockaddr *sin, int len,
1620 int flags)
1621{
1622 struct svc_sock *svsk;
1623 struct svc_xprt *xprt;
1624
1625 if (protocol != IPPROTO_TCP) {
1626 printk(KERN_WARNING "svc: only TCP sockets"
1627 " supported on shared back channel\n");
1628 return ERR_PTR(-EINVAL);
1629 }
1630
1631 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1632 if (!svsk)
1633 return ERR_PTR(-ENOMEM);
1634
1635 xprt = &svsk->sk_xprt;
1636 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1637
1638 serv->sv_bc_xprt = xprt;
1639
1640 return xprt;
1641}
1642
1643/*
1644 * Free a back channel svc_sock.
1645 */
1646static void svc_bc_sock_free(struct svc_xprt *xprt)
1647{
1648 if (xprt)
1649 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1650}
1651#endif /* CONFIG_SUNRPC_BACKCHANNEL */