2 * linux/net/sunrpc/svcsock.c
4 * These are the RPC server socket internals.
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...
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.
19 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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>
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>
39 #include <net/checksum.h>
43 #include <net/tcp_states.h>
44 #include <asm/uaccess.h>
45 #include <asm/ioctls.h>
46 #include <trace/events/skb.h>
48 #include <linux/sunrpc/types.h>
49 #include <linux/sunrpc/clnt.h>
50 #include <linux/sunrpc/xdr.h>
51 #include <linux/sunrpc/msg_prot.h>
52 #include <linux/sunrpc/svcsock.h>
53 #include <linux/sunrpc/stats.h>
54 #include <linux/sunrpc/xprt.h>
58 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
61 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
63 static void svc_udp_data_ready(struct sock *, int);
64 static int svc_udp_recvfrom(struct svc_rqst *);
65 static int svc_udp_sendto(struct svc_rqst *);
66 static void svc_sock_detach(struct svc_xprt *);
67 static void svc_tcp_sock_detach(struct svc_xprt *);
68 static void svc_sock_free(struct svc_xprt *);
70 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
71 struct net *, struct sockaddr *,
73 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
74 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
77 static void svc_bc_sock_free(struct svc_xprt *xprt);
78 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
80 #ifdef CONFIG_DEBUG_LOCK_ALLOC
81 static struct lock_class_key svc_key[2];
82 static struct lock_class_key svc_slock_key[2];
84 static void svc_reclassify_socket(struct socket *sock)
86 struct sock *sk = sock->sk;
87 BUG_ON(sock_owned_by_user(sk));
88 switch (sk->sk_family) {
90 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
92 "sk_xprt.xpt_lock-AF_INET-NFSD",
97 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
99 "sk_xprt.xpt_lock-AF_INET6-NFSD",
108 static void svc_reclassify_socket(struct socket *sock)
114 * Release an skbuff after use
116 static void svc_release_skb(struct svc_rqst *rqstp)
118 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
121 struct svc_sock *svsk =
122 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
123 rqstp->rq_xprt_ctxt = NULL;
125 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
126 skb_free_datagram_locked(svsk->sk_sk, skb);
130 union svc_pktinfo_u {
131 struct in_pktinfo pkti;
132 struct in6_pktinfo pkti6;
134 #define SVC_PKTINFO_SPACE \
135 CMSG_SPACE(sizeof(union svc_pktinfo_u))
137 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
139 struct svc_sock *svsk =
140 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
141 switch (svsk->sk_sk->sk_family) {
143 struct in_pktinfo *pki = CMSG_DATA(cmh);
145 cmh->cmsg_level = SOL_IP;
146 cmh->cmsg_type = IP_PKTINFO;
147 pki->ipi_ifindex = 0;
148 pki->ipi_spec_dst.s_addr =
149 svc_daddr_in(rqstp)->sin_addr.s_addr;
150 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
155 struct in6_pktinfo *pki = CMSG_DATA(cmh);
156 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
158 cmh->cmsg_level = SOL_IPV6;
159 cmh->cmsg_type = IPV6_PKTINFO;
160 pki->ipi6_ifindex = daddr->sin6_scope_id;
161 pki->ipi6_addr = daddr->sin6_addr;
162 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
169 * send routine intended to be shared by the fore- and back-channel
171 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
172 struct page *headpage, unsigned long headoffset,
173 struct page *tailpage, unsigned long tailoffset)
177 struct page **ppage = xdr->pages;
178 size_t base = xdr->page_base;
179 unsigned int pglen = xdr->page_len;
180 unsigned int flags = MSG_MORE;
187 if (slen == xdr->head[0].iov_len)
189 len = kernel_sendpage(sock, headpage, headoffset,
190 xdr->head[0].iov_len, flags);
191 if (len != xdr->head[0].iov_len)
193 slen -= xdr->head[0].iov_len;
198 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
202 result = kernel_sendpage(sock, *ppage, base, size, flags);
209 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
215 if (xdr->tail[0].iov_len) {
216 result = kernel_sendpage(sock, tailpage, tailoffset,
217 xdr->tail[0].iov_len, 0);
228 * Generic sendto routine
230 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
232 struct svc_sock *svsk =
233 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
234 struct socket *sock = svsk->sk_sock;
237 long all[SVC_PKTINFO_SPACE / sizeof(long)];
239 struct cmsghdr *cmh = &buffer.hdr;
241 unsigned long tailoff;
242 unsigned long headoff;
243 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
245 if (rqstp->rq_prot == IPPROTO_UDP) {
246 struct msghdr msg = {
247 .msg_name = &rqstp->rq_addr,
248 .msg_namelen = rqstp->rq_addrlen,
250 .msg_controllen = sizeof(buffer),
251 .msg_flags = MSG_MORE,
254 svc_set_cmsg_data(rqstp, cmh);
256 if (sock_sendmsg(sock, &msg, 0) < 0)
260 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
262 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
263 rqstp->rq_respages[0], tailoff);
266 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
267 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
268 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
274 * Report socket names for nfsdfs
276 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
278 const struct sock *sk = svsk->sk_sk;
279 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
283 switch (sk->sk_family) {
285 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
287 &inet_sk(sk)->inet_rcv_saddr,
288 inet_sk(sk)->inet_num);
291 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
293 &inet6_sk(sk)->rcv_saddr,
294 inet_sk(sk)->inet_num);
297 len = snprintf(buf, remaining, "*unknown-%d*\n",
301 if (len >= remaining) {
303 return -ENAMETOOLONG;
309 * Check input queue length
311 static int svc_recv_available(struct svc_sock *svsk)
313 struct socket *sock = svsk->sk_sock;
316 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
318 return (err >= 0)? avail : err;
322 * Generic recvfrom routine.
324 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
327 struct svc_sock *svsk =
328 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
329 struct msghdr msg = {
330 .msg_flags = MSG_DONTWAIT,
334 rqstp->rq_xprt_hlen = 0;
336 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
339 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
340 svsk, iov[0].iov_base, iov[0].iov_len, len);
344 static int svc_partial_recvfrom(struct svc_rqst *rqstp,
345 struct kvec *iov, int nr,
346 int buflen, unsigned int base)
354 return svc_recvfrom(rqstp, iov, nr, buflen);
356 for (i = 0; i < nr; i++) {
357 if (iov[i].iov_len > base)
359 base -= iov[i].iov_len;
361 save_iovlen = iov[i].iov_len;
362 save_iovbase = iov[i].iov_base;
363 iov[i].iov_len -= base;
364 iov[i].iov_base += base;
365 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
366 iov[i].iov_len = save_iovlen;
367 iov[i].iov_base = save_iovbase;
372 * Set socket snd and rcv buffer lengths
374 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
379 oldfs = get_fs(); set_fs(KERNEL_DS);
380 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
381 (char*)&snd, sizeof(snd));
382 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
383 (char*)&rcv, sizeof(rcv));
385 /* sock_setsockopt limits use to sysctl_?mem_max,
386 * which isn't acceptable. Until that is made conditional
387 * on not having CAP_SYS_RESOURCE or similar, we go direct...
388 * DaveM said I could!
391 sock->sk->sk_sndbuf = snd * 2;
392 sock->sk->sk_rcvbuf = rcv * 2;
393 sock->sk->sk_write_space(sock->sk);
394 release_sock(sock->sk);
398 * INET callback when data has been received on the socket.
400 static void svc_udp_data_ready(struct sock *sk, int count)
402 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
403 wait_queue_head_t *wq = sk_sleep(sk);
406 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
408 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
409 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
410 svc_xprt_enqueue(&svsk->sk_xprt);
412 if (wq && waitqueue_active(wq))
413 wake_up_interruptible(wq);
417 * INET callback when space is newly available on the socket.
419 static void svc_write_space(struct sock *sk)
421 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
422 wait_queue_head_t *wq = sk_sleep(sk);
425 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
426 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
427 svc_xprt_enqueue(&svsk->sk_xprt);
430 if (wq && waitqueue_active(wq)) {
431 dprintk("RPC svc_write_space: someone sleeping on %p\n",
433 wake_up_interruptible(wq);
437 static void svc_tcp_write_space(struct sock *sk)
439 struct socket *sock = sk->sk_socket;
441 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
442 clear_bit(SOCK_NOSPACE, &sock->flags);
447 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
449 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
452 struct in_pktinfo *pki = CMSG_DATA(cmh);
453 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
455 if (cmh->cmsg_type != IP_PKTINFO)
458 daddr->sin_family = AF_INET;
459 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
464 * See net/ipv6/datagram.c : datagram_recv_ctl
466 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
469 struct in6_pktinfo *pki = CMSG_DATA(cmh);
470 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
472 if (cmh->cmsg_type != IPV6_PKTINFO)
475 daddr->sin6_family = AF_INET6;
476 daddr->sin6_addr = pki->ipi6_addr;
477 daddr->sin6_scope_id = pki->ipi6_ifindex;
482 * Copy the UDP datagram's destination address to the rqstp structure.
483 * The 'destination' address in this case is the address to which the
484 * peer sent the datagram, i.e. our local address. For multihomed
485 * hosts, this can change from msg to msg. Note that only the IP
486 * address changes, the port number should remain the same.
488 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
491 switch (cmh->cmsg_level) {
493 return svc_udp_get_dest_address4(rqstp, cmh);
495 return svc_udp_get_dest_address6(rqstp, cmh);
502 * Receive a datagram from a UDP socket.
504 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
506 struct svc_sock *svsk =
507 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
508 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
512 long all[SVC_PKTINFO_SPACE / sizeof(long)];
514 struct cmsghdr *cmh = &buffer.hdr;
515 struct msghdr msg = {
516 .msg_name = svc_addr(rqstp),
518 .msg_controllen = sizeof(buffer),
519 .msg_flags = MSG_DONTWAIT,
524 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
525 /* udp sockets need large rcvbuf as all pending
526 * requests are still in that buffer. sndbuf must
527 * also be large enough that there is enough space
528 * for one reply per thread. We count all threads
529 * rather than threads in a particular pool, which
530 * provides an upper bound on the number of threads
531 * which will access the socket.
533 svc_sock_setbufsize(svsk->sk_sock,
534 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
535 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
537 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
539 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
540 0, 0, MSG_PEEK | MSG_DONTWAIT);
542 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
545 if (err != -EAGAIN) {
546 /* possibly an icmp error */
547 dprintk("svc: recvfrom returned error %d\n", -err);
548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
552 len = svc_addr_len(svc_addr(rqstp));
553 rqstp->rq_addrlen = len;
554 if (skb->tstamp.tv64 == 0) {
555 skb->tstamp = ktime_get_real();
556 /* Don't enable netstamp, sunrpc doesn't
557 need that much accuracy */
559 svsk->sk_sk->sk_stamp = skb->tstamp;
560 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
562 len = skb->len - sizeof(struct udphdr);
563 rqstp->rq_arg.len = len;
565 rqstp->rq_prot = IPPROTO_UDP;
567 if (!svc_udp_get_dest_address(rqstp, cmh)) {
568 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
569 cmh->cmsg_level, cmh->cmsg_type);
572 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
574 if (skb_is_nonlinear(skb)) {
575 /* we have to copy */
577 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
583 skb_free_datagram_locked(svsk->sk_sk, skb);
585 /* we can use it in-place */
586 rqstp->rq_arg.head[0].iov_base = skb->data +
587 sizeof(struct udphdr);
588 rqstp->rq_arg.head[0].iov_len = len;
589 if (skb_checksum_complete(skb))
591 rqstp->rq_xprt_ctxt = skb;
594 rqstp->rq_arg.page_base = 0;
595 if (len <= rqstp->rq_arg.head[0].iov_len) {
596 rqstp->rq_arg.head[0].iov_len = len;
597 rqstp->rq_arg.page_len = 0;
598 rqstp->rq_respages = rqstp->rq_pages+1;
600 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
601 rqstp->rq_respages = rqstp->rq_pages + 1 +
602 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
606 serv->sv_stats->netudpcnt++;
610 trace_kfree_skb(skb, svc_udp_recvfrom);
611 skb_free_datagram_locked(svsk->sk_sk, skb);
616 svc_udp_sendto(struct svc_rqst *rqstp)
620 error = svc_sendto(rqstp, &rqstp->rq_res);
621 if (error == -ECONNREFUSED)
622 /* ICMP error on earlier request. */
623 error = svc_sendto(rqstp, &rqstp->rq_res);
628 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
632 static int svc_udp_has_wspace(struct svc_xprt *xprt)
634 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
635 struct svc_serv *serv = xprt->xpt_server;
636 unsigned long required;
639 * Set the SOCK_NOSPACE flag before checking the available
642 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
643 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
644 if (required*2 > sock_wspace(svsk->sk_sk))
646 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
650 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
656 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
658 struct sockaddr *sa, int salen,
661 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
664 static struct svc_xprt_ops svc_udp_ops = {
665 .xpo_create = svc_udp_create,
666 .xpo_recvfrom = svc_udp_recvfrom,
667 .xpo_sendto = svc_udp_sendto,
668 .xpo_release_rqst = svc_release_skb,
669 .xpo_detach = svc_sock_detach,
670 .xpo_free = svc_sock_free,
671 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
672 .xpo_has_wspace = svc_udp_has_wspace,
673 .xpo_accept = svc_udp_accept,
676 static struct svc_xprt_class svc_udp_class = {
678 .xcl_owner = THIS_MODULE,
679 .xcl_ops = &svc_udp_ops,
680 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
683 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
685 int err, level, optname, one = 1;
687 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
688 &svsk->sk_xprt, serv);
689 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
690 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
691 svsk->sk_sk->sk_write_space = svc_write_space;
693 /* initialise setting must have enough space to
694 * receive and respond to one request.
695 * svc_udp_recvfrom will re-adjust if necessary
697 svc_sock_setbufsize(svsk->sk_sock,
698 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
699 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
701 /* data might have come in before data_ready set up */
702 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
703 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
705 /* make sure we get destination address info */
706 switch (svsk->sk_sk->sk_family) {
709 optname = IP_PKTINFO;
713 optname = IPV6_RECVPKTINFO;
718 err = kernel_setsockopt(svsk->sk_sock, level, optname,
719 (char *)&one, sizeof(one));
720 dprintk("svc: kernel_setsockopt returned %d\n", err);
724 * A data_ready event on a listening socket means there's a connection
725 * pending. Do not use state_change as a substitute for it.
727 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
729 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
730 wait_queue_head_t *wq;
732 dprintk("svc: socket %p TCP (listen) state change %d\n",
736 * This callback may called twice when a new connection
737 * is established as a child socket inherits everything
738 * from a parent LISTEN socket.
739 * 1) data_ready method of the parent socket will be called
740 * when one of child sockets become ESTABLISHED.
741 * 2) data_ready method of the child socket may be called
742 * when it receives data before the socket is accepted.
743 * In case of 2, we should ignore it silently.
745 if (sk->sk_state == TCP_LISTEN) {
747 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
748 svc_xprt_enqueue(&svsk->sk_xprt);
750 printk("svc: socket %p: no user data\n", sk);
754 if (wq && waitqueue_active(wq))
755 wake_up_interruptible_all(wq);
759 * A state change on a connected socket means it's dying or dead.
761 static void svc_tcp_state_change(struct sock *sk)
763 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
764 wait_queue_head_t *wq = sk_sleep(sk);
766 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
767 sk, sk->sk_state, sk->sk_user_data);
770 printk("svc: socket %p: no user data\n", sk);
772 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
773 svc_xprt_enqueue(&svsk->sk_xprt);
775 if (wq && waitqueue_active(wq))
776 wake_up_interruptible_all(wq);
779 static void svc_tcp_data_ready(struct sock *sk, int count)
781 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
782 wait_queue_head_t *wq = sk_sleep(sk);
784 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
785 sk, sk->sk_user_data);
787 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
788 svc_xprt_enqueue(&svsk->sk_xprt);
790 if (wq && waitqueue_active(wq))
791 wake_up_interruptible(wq);
795 * Accept a TCP connection
797 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
799 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
800 struct sockaddr_storage addr;
801 struct sockaddr *sin = (struct sockaddr *) &addr;
802 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
803 struct socket *sock = svsk->sk_sock;
804 struct socket *newsock;
805 struct svc_sock *newsvsk;
807 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
809 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
813 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
814 err = kernel_accept(sock, &newsock, O_NONBLOCK);
817 printk(KERN_WARNING "%s: no more sockets!\n",
819 else if (err != -EAGAIN)
820 net_warn_ratelimited("%s: accept failed (err %d)!\n",
821 serv->sv_name, -err);
824 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
826 err = kernel_getpeername(newsock, sin, &slen);
828 net_warn_ratelimited("%s: peername failed (err %d)!\n",
829 serv->sv_name, -err);
830 goto failed; /* aborted connection or whatever */
833 /* Ideally, we would want to reject connections from unauthorized
834 * hosts here, but when we get encryption, the IP of the host won't
835 * tell us anything. For now just warn about unpriv connections.
837 if (!svc_port_is_privileged(sin)) {
839 "%s: connect from unprivileged port: %s\n",
841 __svc_print_addr(sin, buf, sizeof(buf)));
843 dprintk("%s: connect from %s\n", serv->sv_name,
844 __svc_print_addr(sin, buf, sizeof(buf)));
846 /* make sure that a write doesn't block forever when
849 newsock->sk->sk_sndtimeo = HZ*30;
851 newsvsk = svc_setup_socket(serv, newsock,
852 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
855 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
856 err = kernel_getsockname(newsock, sin, &slen);
857 if (unlikely(err < 0)) {
858 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
859 slen = offsetof(struct sockaddr, sa_data);
861 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
864 serv->sv_stats->nettcpconn++;
866 return &newsvsk->sk_xprt;
869 sock_release(newsock);
873 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
875 unsigned int i, len, npages;
877 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
879 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
880 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
881 for (i = 0; i < npages; i++) {
882 if (rqstp->rq_pages[i] != NULL)
883 put_page(rqstp->rq_pages[i]);
884 BUG_ON(svsk->sk_pages[i] == NULL);
885 rqstp->rq_pages[i] = svsk->sk_pages[i];
886 svsk->sk_pages[i] = NULL;
888 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
892 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
894 unsigned int i, len, npages;
896 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
898 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
899 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
900 for (i = 0; i < npages; i++) {
901 svsk->sk_pages[i] = rqstp->rq_pages[i];
902 rqstp->rq_pages[i] = NULL;
906 static void svc_tcp_clear_pages(struct svc_sock *svsk)
908 unsigned int i, len, npages;
910 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
912 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
913 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
914 for (i = 0; i < npages; i++) {
915 BUG_ON(svsk->sk_pages[i] == NULL);
916 put_page(svsk->sk_pages[i]);
917 svsk->sk_pages[i] = NULL;
925 * If we haven't gotten the record length yet, get the next four bytes.
926 * Otherwise try to gobble up as much as possible up to the complete
929 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
931 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
935 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
937 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
940 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
941 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
943 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
945 svsk->sk_tcplen += len;
948 dprintk("svc: short recvfrom while reading record "
949 "length (%d of %d)\n", len, want);
953 svsk->sk_reclen = ntohl(svsk->sk_reclen);
954 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
955 /* FIXME: technically, a record can be fragmented,
956 * and non-terminal fragments will not have the top
957 * bit set in the fragment length header.
958 * But apparently no known nfs clients send fragmented
960 net_notice_ratelimited("RPC: multiple fragments per record not supported\n");
964 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
965 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
966 if (svsk->sk_reclen > serv->sv_max_mesg) {
967 net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n",
968 (unsigned long)svsk->sk_reclen);
973 if (svsk->sk_reclen < 8)
974 goto err_delete; /* client is nuts. */
976 len = svsk->sk_reclen;
980 dprintk("RPC: TCP recv_record got %d\n", len);
983 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
987 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
989 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
990 struct rpc_rqst *req = NULL;
991 struct kvec *src, *dst;
992 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1000 req = xprt_lookup_rqst(bc_xprt, xid);
1004 "%s: Got unrecognized reply: "
1005 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1006 __func__, ntohl(calldir),
1011 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1013 * XXX!: cheating for now! Only copying HEAD.
1014 * But we know this is good enough for now (in fact, for any
1015 * callback reply in the forseeable future).
1017 dst = &req->rq_private_buf.head[0];
1018 src = &rqstp->rq_arg.head[0];
1019 if (dst->iov_len < src->iov_len)
1020 return -EAGAIN; /* whatever; just giving up. */
1021 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1022 xprt_complete_rqst(req->rq_task, svsk->sk_reclen);
1023 rqstp->rq_arg.len = 0;
1027 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1033 vec[i].iov_base = page_address(pages[i]);
1034 vec[i].iov_len = PAGE_SIZE;
1043 * Receive data from a TCP socket.
1045 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1047 struct svc_sock *svsk =
1048 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1049 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1052 unsigned int want, base;
1057 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1058 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1059 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1060 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1062 len = svc_tcp_recv_record(svsk, rqstp);
1066 base = svc_tcp_restore_pages(svsk, rqstp);
1067 want = svsk->sk_reclen - base;
1069 vec = rqstp->rq_vec;
1071 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1074 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1076 /* Now receive data */
1077 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1079 svsk->sk_tcplen += len;
1081 svc_tcp_save_pages(svsk, rqstp);
1082 if (len < 0 && len != -EAGAIN)
1084 dprintk("svc: incomplete TCP record (%d of %d)\n",
1085 svsk->sk_tcplen, svsk->sk_reclen);
1089 rqstp->rq_arg.len = svsk->sk_reclen;
1090 rqstp->rq_arg.page_base = 0;
1091 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1092 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1093 rqstp->rq_arg.page_len = 0;
1095 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1097 rqstp->rq_xprt_ctxt = NULL;
1098 rqstp->rq_prot = IPPROTO_TCP;
1100 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1103 len = receive_cb_reply(svsk, rqstp);
1105 /* Reset TCP read info */
1106 svsk->sk_reclen = 0;
1107 svsk->sk_tcplen = 0;
1108 /* If we have more data, signal svc_xprt_enqueue() to try again */
1109 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1110 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1115 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1117 serv->sv_stats->nettcpcnt++;
1119 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len);
1120 return rqstp->rq_arg.len;
1125 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1128 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1129 svsk->sk_xprt.xpt_server->sv_name, -len);
1130 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1132 return 0; /* record not complete */
1136 * Send out data on TCP socket.
1138 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1140 struct xdr_buf *xbufp = &rqstp->rq_res;
1144 /* Set up the first element of the reply kvec.
1145 * Any other kvecs that may be in use have been taken
1146 * care of by the server implementation itself.
1148 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1149 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1151 sent = svc_sendto(rqstp, &rqstp->rq_res);
1152 if (sent != xbufp->len) {
1154 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1155 "- shutting down socket\n",
1156 rqstp->rq_xprt->xpt_server->sv_name,
1157 (sent<0)?"got error":"sent only",
1159 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1160 svc_xprt_enqueue(rqstp->rq_xprt);
1167 * Setup response header. TCP has a 4B record length field.
1169 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1171 struct kvec *resv = &rqstp->rq_res.head[0];
1173 /* tcp needs a space for the record length... */
1177 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1179 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1180 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1183 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1185 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1186 if (sk_stream_wspace(svsk->sk_sk) >= required)
1188 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1192 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1194 struct sockaddr *sa, int salen,
1197 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1200 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1201 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1202 struct net *, struct sockaddr *,
1204 static void svc_bc_sock_free(struct svc_xprt *xprt);
1206 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1208 struct sockaddr *sa, int salen,
1211 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1214 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1218 static struct svc_xprt_ops svc_tcp_bc_ops = {
1219 .xpo_create = svc_bc_tcp_create,
1220 .xpo_detach = svc_bc_tcp_sock_detach,
1221 .xpo_free = svc_bc_sock_free,
1222 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1225 static struct svc_xprt_class svc_tcp_bc_class = {
1226 .xcl_name = "tcp-bc",
1227 .xcl_owner = THIS_MODULE,
1228 .xcl_ops = &svc_tcp_bc_ops,
1229 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1232 static void svc_init_bc_xprt_sock(void)
1234 svc_reg_xprt_class(&svc_tcp_bc_class);
1237 static void svc_cleanup_bc_xprt_sock(void)
1239 svc_unreg_xprt_class(&svc_tcp_bc_class);
1241 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1242 static void svc_init_bc_xprt_sock(void)
1246 static void svc_cleanup_bc_xprt_sock(void)
1249 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1251 static struct svc_xprt_ops svc_tcp_ops = {
1252 .xpo_create = svc_tcp_create,
1253 .xpo_recvfrom = svc_tcp_recvfrom,
1254 .xpo_sendto = svc_tcp_sendto,
1255 .xpo_release_rqst = svc_release_skb,
1256 .xpo_detach = svc_tcp_sock_detach,
1257 .xpo_free = svc_sock_free,
1258 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1259 .xpo_has_wspace = svc_tcp_has_wspace,
1260 .xpo_accept = svc_tcp_accept,
1263 static struct svc_xprt_class svc_tcp_class = {
1265 .xcl_owner = THIS_MODULE,
1266 .xcl_ops = &svc_tcp_ops,
1267 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1270 void svc_init_xprt_sock(void)
1272 svc_reg_xprt_class(&svc_tcp_class);
1273 svc_reg_xprt_class(&svc_udp_class);
1274 svc_init_bc_xprt_sock();
1277 void svc_cleanup_xprt_sock(void)
1279 svc_unreg_xprt_class(&svc_tcp_class);
1280 svc_unreg_xprt_class(&svc_udp_class);
1281 svc_cleanup_bc_xprt_sock();
1284 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1286 struct sock *sk = svsk->sk_sk;
1288 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1289 &svsk->sk_xprt, serv);
1290 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1291 if (sk->sk_state == TCP_LISTEN) {
1292 dprintk("setting up TCP socket for listening\n");
1293 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1294 sk->sk_data_ready = svc_tcp_listen_data_ready;
1295 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1297 dprintk("setting up TCP socket for reading\n");
1298 sk->sk_state_change = svc_tcp_state_change;
1299 sk->sk_data_ready = svc_tcp_data_ready;
1300 sk->sk_write_space = svc_tcp_write_space;
1302 svsk->sk_reclen = 0;
1303 svsk->sk_tcplen = 0;
1304 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1306 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1308 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1309 if (sk->sk_state != TCP_ESTABLISHED)
1310 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1314 void svc_sock_update_bufs(struct svc_serv *serv)
1317 * The number of server threads has changed. Update
1318 * rcvbuf and sndbuf accordingly on all sockets
1320 struct svc_sock *svsk;
1322 spin_lock_bh(&serv->sv_lock);
1323 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1324 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1325 spin_unlock_bh(&serv->sv_lock);
1327 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1330 * Initialize socket for RPC use and create svc_sock struct
1331 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1333 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1334 struct socket *sock,
1337 struct svc_sock *svsk;
1339 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1342 dprintk("svc: svc_setup_socket %p\n", sock);
1343 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1345 return ERR_PTR(-ENOMEM);
1349 /* Register socket with portmapper */
1351 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1353 ntohs(inet_sk(inet)->inet_sport));
1357 return ERR_PTR(err);
1360 inet->sk_user_data = svsk;
1361 svsk->sk_sock = sock;
1363 svsk->sk_ostate = inet->sk_state_change;
1364 svsk->sk_odata = inet->sk_data_ready;
1365 svsk->sk_owspace = inet->sk_write_space;
1367 /* Initialize the socket */
1368 if (sock->type == SOCK_DGRAM)
1369 svc_udp_init(svsk, serv);
1371 /* initialise setting must have enough space to
1372 * receive and respond to one request.
1374 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1375 4 * serv->sv_max_mesg);
1376 svc_tcp_init(svsk, serv);
1379 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1386 * svc_addsock - add a listener socket to an RPC service
1387 * @serv: pointer to RPC service to which to add a new listener
1388 * @fd: file descriptor of the new listener
1389 * @name_return: pointer to buffer to fill in with name of listener
1390 * @len: size of the buffer
1392 * Fills in socket name and returns positive length of name if successful.
1393 * Name is terminated with '\n'. On error, returns a negative errno
1396 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1400 struct socket *so = sockfd_lookup(fd, &err);
1401 struct svc_sock *svsk = NULL;
1402 struct sockaddr_storage addr;
1403 struct sockaddr *sin = (struct sockaddr *)&addr;
1408 err = -EAFNOSUPPORT;
1409 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1411 err = -EPROTONOSUPPORT;
1412 if (so->sk->sk_protocol != IPPROTO_TCP &&
1413 so->sk->sk_protocol != IPPROTO_UDP)
1416 if (so->state > SS_UNCONNECTED)
1419 if (!try_module_get(THIS_MODULE))
1421 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1423 module_put(THIS_MODULE);
1424 err = PTR_ERR(svsk);
1427 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1428 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1429 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1430 return svc_one_sock_name(svsk, name_return, len);
1435 EXPORT_SYMBOL_GPL(svc_addsock);
1438 * Create socket for RPC service.
1440 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1443 struct sockaddr *sin, int len,
1446 struct svc_sock *svsk;
1447 struct socket *sock;
1450 struct sockaddr_storage addr;
1451 struct sockaddr *newsin = (struct sockaddr *)&addr;
1455 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1457 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1458 serv->sv_program->pg_name, protocol,
1459 __svc_print_addr(sin, buf, sizeof(buf)));
1461 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1462 printk(KERN_WARNING "svc: only UDP and TCP "
1463 "sockets supported\n");
1464 return ERR_PTR(-EINVAL);
1467 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1468 switch (sin->sa_family) {
1476 return ERR_PTR(-EINVAL);
1479 error = __sock_create(net, family, type, protocol, &sock, 1);
1481 return ERR_PTR(error);
1483 svc_reclassify_socket(sock);
1486 * If this is an PF_INET6 listener, we want to avoid
1487 * getting requests from IPv4 remotes. Those should
1488 * be shunted to a PF_INET listener via rpcbind.
1491 if (family == PF_INET6)
1492 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1493 (char *)&val, sizeof(val));
1495 if (type == SOCK_STREAM)
1496 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1497 error = kernel_bind(sock, sin, len);
1502 error = kernel_getsockname(sock, newsin, &newlen);
1506 if (protocol == IPPROTO_TCP) {
1507 if ((error = kernel_listen(sock, 64)) < 0)
1511 svsk = svc_setup_socket(serv, sock, flags);
1513 error = PTR_ERR(svsk);
1516 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1517 return (struct svc_xprt *)svsk;
1519 dprintk("svc: svc_create_socket error = %d\n", -error);
1521 return ERR_PTR(error);
1525 * Detach the svc_sock from the socket so that no
1526 * more callbacks occur.
1528 static void svc_sock_detach(struct svc_xprt *xprt)
1530 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1531 struct sock *sk = svsk->sk_sk;
1532 wait_queue_head_t *wq;
1534 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1536 /* put back the old socket callbacks */
1537 sk->sk_state_change = svsk->sk_ostate;
1538 sk->sk_data_ready = svsk->sk_odata;
1539 sk->sk_write_space = svsk->sk_owspace;
1542 if (wq && waitqueue_active(wq))
1543 wake_up_interruptible(wq);
1547 * Disconnect the socket, and reset the callbacks
1549 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1551 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1553 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1555 svc_sock_detach(xprt);
1557 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1558 svc_tcp_clear_pages(svsk);
1559 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1564 * Free the svc_sock's socket resources and the svc_sock itself.
1566 static void svc_sock_free(struct svc_xprt *xprt)
1568 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1569 dprintk("svc: svc_sock_free(%p)\n", svsk);
1571 if (svsk->sk_sock->file)
1572 sockfd_put(svsk->sk_sock);
1574 sock_release(svsk->sk_sock);
1578 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1580 * Create a back channel svc_xprt which shares the fore channel socket.
1582 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1585 struct sockaddr *sin, int len,
1588 struct svc_sock *svsk;
1589 struct svc_xprt *xprt;
1591 if (protocol != IPPROTO_TCP) {
1592 printk(KERN_WARNING "svc: only TCP sockets"
1593 " supported on shared back channel\n");
1594 return ERR_PTR(-EINVAL);
1597 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1599 return ERR_PTR(-ENOMEM);
1601 xprt = &svsk->sk_xprt;
1602 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1604 serv->sv_bc_xprt = xprt;
1610 * Free a back channel svc_sock.
1612 static void svc_bc_sock_free(struct svc_xprt *xprt)
1615 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1617 #endif /* CONFIG_SUNRPC_BACKCHANNEL */