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>
44 #include <net/tcp_states.h>
45 #include <asm/uaccess.h>
46 #include <asm/ioctls.h>
47 #include <trace/events/skb.h>
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>
59 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
62 static struct svc_sock
*svc_setup_socket(struct svc_serv
*, struct socket
*,
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
;
88 if (WARN_ON_ONCE(!sock_allow_reclassification(sk
)))
91 switch (sk
->sk_family
) {
93 sock_lock_init_class_and_name(sk
, "slock-AF_INET-NFSD",
95 "sk_xprt.xpt_lock-AF_INET-NFSD",
100 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-NFSD",
102 "sk_xprt.xpt_lock-AF_INET6-NFSD",
111 static void svc_reclassify_socket(struct socket
*sock
)
117 * Release an skbuff after use
119 static void svc_release_skb(struct svc_rqst
*rqstp
)
121 struct sk_buff
*skb
= rqstp
->rq_xprt_ctxt
;
124 struct svc_sock
*svsk
=
125 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
126 rqstp
->rq_xprt_ctxt
= NULL
;
128 dprintk("svc: service %p, releasing skb %p\n", rqstp
, skb
);
129 skb_free_datagram_locked(svsk
->sk_sk
, skb
);
133 static void svc_release_udp_skb(struct svc_rqst
*rqstp
)
135 struct sk_buff
*skb
= rqstp
->rq_xprt_ctxt
;
138 rqstp
->rq_xprt_ctxt
= NULL
;
140 dprintk("svc: service %p, releasing skb %p\n", rqstp
, skb
);
145 union svc_pktinfo_u
{
146 struct in_pktinfo pkti
;
147 struct in6_pktinfo pkti6
;
149 #define SVC_PKTINFO_SPACE \
150 CMSG_SPACE(sizeof(union svc_pktinfo_u))
152 static void svc_set_cmsg_data(struct svc_rqst
*rqstp
, struct cmsghdr
*cmh
)
154 struct svc_sock
*svsk
=
155 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
156 switch (svsk
->sk_sk
->sk_family
) {
158 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
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
));
170 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
171 struct sockaddr_in6
*daddr
= svc_daddr_in6(rqstp
);
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
));
184 * send routine intended to be shared by the fore- and back-channel
186 int svc_send_common(struct socket
*sock
, struct xdr_buf
*xdr
,
187 struct page
*headpage
, unsigned long headoffset
,
188 struct page
*tailpage
, unsigned long tailoffset
)
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
;
202 if (slen
== xdr
->head
[0].iov_len
)
204 len
= kernel_sendpage(sock
, headpage
, headoffset
,
205 xdr
->head
[0].iov_len
, flags
);
206 if (len
!= xdr
->head
[0].iov_len
)
208 slen
-= xdr
->head
[0].iov_len
;
213 size
= PAGE_SIZE
- base
< pglen
? PAGE_SIZE
- base
: pglen
;
217 result
= kernel_sendpage(sock
, *ppage
, base
, size
, flags
);
224 size
= PAGE_SIZE
< pglen
? PAGE_SIZE
: pglen
;
230 if (xdr
->tail
[0].iov_len
) {
231 result
= kernel_sendpage(sock
, tailpage
, tailoffset
,
232 xdr
->tail
[0].iov_len
, 0);
243 * Generic sendto routine
245 static int svc_sendto(struct svc_rqst
*rqstp
, struct xdr_buf
*xdr
)
247 struct svc_sock
*svsk
=
248 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
249 struct socket
*sock
= svsk
->sk_sock
;
252 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
254 struct cmsghdr
*cmh
= &buffer
.hdr
;
256 unsigned long tailoff
;
257 unsigned long headoff
;
258 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
260 if (rqstp
->rq_prot
== IPPROTO_UDP
) {
261 struct msghdr msg
= {
262 .msg_name
= &rqstp
->rq_addr
,
263 .msg_namelen
= rqstp
->rq_addrlen
,
265 .msg_controllen
= sizeof(buffer
),
266 .msg_flags
= MSG_MORE
,
269 svc_set_cmsg_data(rqstp
, cmh
);
271 if (sock_sendmsg(sock
, &msg
) < 0)
275 tailoff
= ((unsigned long)xdr
->tail
[0].iov_base
) & (PAGE_SIZE
-1);
277 len
= svc_send_common(sock
, xdr
, rqstp
->rq_respages
[0], headoff
,
278 rqstp
->rq_respages
[0], tailoff
);
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
)));
289 * Report socket names for nfsdfs
291 static int svc_one_sock_name(struct svc_sock
*svsk
, char *buf
, int remaining
)
293 const struct sock
*sk
= svsk
->sk_sk
;
294 const char *proto_name
= sk
->sk_protocol
== IPPROTO_UDP
?
298 switch (sk
->sk_family
) {
300 len
= snprintf(buf
, remaining
, "ipv4 %s %pI4 %d\n",
302 &inet_sk(sk
)->inet_rcv_saddr
,
303 inet_sk(sk
)->inet_num
);
305 #if IS_ENABLED(CONFIG_IPV6)
307 len
= snprintf(buf
, remaining
, "ipv6 %s %pI6 %d\n",
309 &sk
->sk_v6_rcv_saddr
,
310 inet_sk(sk
)->inet_num
);
314 len
= snprintf(buf
, remaining
, "*unknown-%d*\n",
318 if (len
>= remaining
) {
320 return -ENAMETOOLONG
;
326 * Generic recvfrom routine.
328 static int svc_recvfrom(struct svc_rqst
*rqstp
, struct kvec
*iov
, int nr
,
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
,
338 rqstp
->rq_xprt_hlen
= 0;
340 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
341 len
= kernel_recvmsg(svsk
->sk_sock
, &msg
, iov
, nr
, buflen
,
343 /* If we read a full record, then assume there may be more
344 * data to read (stream based sockets only!)
347 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
349 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
350 svsk
, iov
[0].iov_base
, iov
[0].iov_len
, len
);
354 static int svc_partial_recvfrom(struct svc_rqst
*rqstp
,
355 struct kvec
*iov
, int nr
,
356 int buflen
, unsigned int base
)
364 return svc_recvfrom(rqstp
, iov
, nr
, buflen
);
366 for (i
= 0; i
< nr
; i
++) {
367 if (iov
[i
].iov_len
> base
)
369 base
-= iov
[i
].iov_len
;
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
;
382 * Set socket snd and rcv buffer lengths
384 static void svc_sock_setbufsize(struct socket
*sock
, unsigned int snd
,
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
));
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!
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
);
408 static int svc_sock_secure_port(struct svc_rqst
*rqstp
)
410 return svc_port_is_privileged(svc_addr(rqstp
));
414 * INET callback when data has been received on the socket.
416 static void svc_data_ready(struct sock
*sk
)
418 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
421 dprintk("svc: socket %p(inet %p), busy=%d\n",
423 test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
));
425 if (!test_and_set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
))
426 svc_xprt_enqueue(&svsk
->sk_xprt
);
431 * INET callback when space is newly available on the socket.
433 static void svc_write_space(struct sock
*sk
)
435 struct svc_sock
*svsk
= (struct svc_sock
*)(sk
->sk_user_data
);
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
);
445 static int svc_tcp_has_wspace(struct svc_xprt
*xprt
)
447 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
449 if (test_bit(XPT_LISTENER
, &xprt
->xpt_flags
))
451 return !test_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
455 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
457 static int svc_udp_get_dest_address4(struct svc_rqst
*rqstp
,
460 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
461 struct sockaddr_in
*daddr
= svc_daddr_in(rqstp
);
463 if (cmh
->cmsg_type
!= IP_PKTINFO
)
466 daddr
->sin_family
= AF_INET
;
467 daddr
->sin_addr
.s_addr
= pki
->ipi_spec_dst
.s_addr
;
472 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
474 static int svc_udp_get_dest_address6(struct svc_rqst
*rqstp
,
477 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
478 struct sockaddr_in6
*daddr
= svc_daddr_in6(rqstp
);
480 if (cmh
->cmsg_type
!= IPV6_PKTINFO
)
483 daddr
->sin6_family
= AF_INET6
;
484 daddr
->sin6_addr
= pki
->ipi6_addr
;
485 daddr
->sin6_scope_id
= pki
->ipi6_ifindex
;
490 * Copy the UDP datagram's destination address to the rqstp structure.
491 * The 'destination' address in this case is the address to which the
492 * peer sent the datagram, i.e. our local address. For multihomed
493 * hosts, this can change from msg to msg. Note that only the IP
494 * address changes, the port number should remain the same.
496 static int svc_udp_get_dest_address(struct svc_rqst
*rqstp
,
499 switch (cmh
->cmsg_level
) {
501 return svc_udp_get_dest_address4(rqstp
, cmh
);
503 return svc_udp_get_dest_address6(rqstp
, cmh
);
510 * Receive a datagram from a UDP socket.
512 static int svc_udp_recvfrom(struct svc_rqst
*rqstp
)
514 struct svc_sock
*svsk
=
515 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
516 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
520 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
522 struct cmsghdr
*cmh
= &buffer
.hdr
;
523 struct msghdr msg
= {
524 .msg_name
= svc_addr(rqstp
),
526 .msg_controllen
= sizeof(buffer
),
527 .msg_flags
= MSG_DONTWAIT
,
532 if (test_and_clear_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
))
533 /* udp sockets need large rcvbuf as all pending
534 * requests are still in that buffer. sndbuf must
535 * also be large enough that there is enough space
536 * for one reply per thread. We count all threads
537 * rather than threads in a particular pool, which
538 * provides an upper bound on the number of threads
539 * which will access the socket.
541 svc_sock_setbufsize(svsk
->sk_sock
,
542 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
,
543 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
);
545 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
547 err
= kernel_recvmsg(svsk
->sk_sock
, &msg
, NULL
,
548 0, 0, MSG_PEEK
| MSG_DONTWAIT
);
550 skb
= skb_recv_udp(svsk
->sk_sk
, 0, 1, &err
);
553 if (err
!= -EAGAIN
) {
554 /* possibly an icmp error */
555 dprintk("svc: recvfrom returned error %d\n", -err
);
556 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
560 len
= svc_addr_len(svc_addr(rqstp
));
561 rqstp
->rq_addrlen
= len
;
562 if (skb
->tstamp
.tv64
== 0) {
563 skb
->tstamp
= ktime_get_real();
564 /* Don't enable netstamp, sunrpc doesn't
565 need that much accuracy */
567 svsk
->sk_sk
->sk_stamp
= skb
->tstamp
;
568 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
); /* there may be more data... */
571 rqstp
->rq_arg
.len
= len
;
573 rqstp
->rq_prot
= IPPROTO_UDP
;
575 if (!svc_udp_get_dest_address(rqstp
, cmh
)) {
576 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
577 cmh
->cmsg_level
, cmh
->cmsg_type
);
580 rqstp
->rq_daddrlen
= svc_addr_len(svc_daddr(rqstp
));
582 if (skb_is_nonlinear(skb
)) {
583 /* we have to copy */
585 if (csum_partial_copy_to_xdr(&rqstp
->rq_arg
, skb
)) {
593 /* we can use it in-place */
594 rqstp
->rq_arg
.head
[0].iov_base
= skb
->data
;
595 rqstp
->rq_arg
.head
[0].iov_len
= len
;
596 if (skb_checksum_complete(skb
))
598 rqstp
->rq_xprt_ctxt
= skb
;
601 rqstp
->rq_arg
.page_base
= 0;
602 if (len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
603 rqstp
->rq_arg
.head
[0].iov_len
= len
;
604 rqstp
->rq_arg
.page_len
= 0;
605 rqstp
->rq_respages
= rqstp
->rq_pages
+1;
607 rqstp
->rq_arg
.page_len
= len
- rqstp
->rq_arg
.head
[0].iov_len
;
608 rqstp
->rq_respages
= rqstp
->rq_pages
+ 1 +
609 DIV_ROUND_UP(rqstp
->rq_arg
.page_len
, PAGE_SIZE
);
611 rqstp
->rq_next_page
= rqstp
->rq_respages
+1;
614 serv
->sv_stats
->netudpcnt
++;
623 svc_udp_sendto(struct svc_rqst
*rqstp
)
627 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
628 if (error
== -ECONNREFUSED
)
629 /* ICMP error on earlier request. */
630 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
635 static void svc_udp_prep_reply_hdr(struct svc_rqst
*rqstp
)
639 static int svc_udp_has_wspace(struct svc_xprt
*xprt
)
641 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
642 struct svc_serv
*serv
= xprt
->xpt_server
;
643 unsigned long required
;
646 * Set the SOCK_NOSPACE flag before checking the available
649 set_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
650 required
= atomic_read(&svsk
->sk_xprt
.xpt_reserved
) + serv
->sv_max_mesg
;
651 if (required
*2 > sock_wspace(svsk
->sk_sk
))
653 clear_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
657 static struct svc_xprt
*svc_udp_accept(struct svc_xprt
*xprt
)
663 static struct svc_xprt
*svc_udp_create(struct svc_serv
*serv
,
665 struct sockaddr
*sa
, int salen
,
668 return svc_create_socket(serv
, IPPROTO_UDP
, net
, sa
, salen
, flags
);
671 static struct svc_xprt_ops svc_udp_ops
= {
672 .xpo_create
= svc_udp_create
,
673 .xpo_recvfrom
= svc_udp_recvfrom
,
674 .xpo_sendto
= svc_udp_sendto
,
675 .xpo_release_rqst
= svc_release_udp_skb
,
676 .xpo_detach
= svc_sock_detach
,
677 .xpo_free
= svc_sock_free
,
678 .xpo_prep_reply_hdr
= svc_udp_prep_reply_hdr
,
679 .xpo_has_wspace
= svc_udp_has_wspace
,
680 .xpo_accept
= svc_udp_accept
,
681 .xpo_secure_port
= svc_sock_secure_port
,
684 static struct svc_xprt_class svc_udp_class
= {
686 .xcl_owner
= THIS_MODULE
,
687 .xcl_ops
= &svc_udp_ops
,
688 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_UDP
,
689 .xcl_ident
= XPRT_TRANSPORT_UDP
,
692 static void svc_udp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
694 int err
, level
, optname
, one
= 1;
696 svc_xprt_init(sock_net(svsk
->sk_sock
->sk
), &svc_udp_class
,
697 &svsk
->sk_xprt
, serv
);
698 clear_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
699 svsk
->sk_sk
->sk_data_ready
= svc_data_ready
;
700 svsk
->sk_sk
->sk_write_space
= svc_write_space
;
702 /* initialise setting must have enough space to
703 * receive and respond to one request.
704 * svc_udp_recvfrom will re-adjust if necessary
706 svc_sock_setbufsize(svsk
->sk_sock
,
707 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
,
708 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
);
710 /* data might have come in before data_ready set up */
711 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
712 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
714 /* make sure we get destination address info */
715 switch (svsk
->sk_sk
->sk_family
) {
718 optname
= IP_PKTINFO
;
722 optname
= IPV6_RECVPKTINFO
;
727 err
= kernel_setsockopt(svsk
->sk_sock
, level
, optname
,
728 (char *)&one
, sizeof(one
));
729 dprintk("svc: kernel_setsockopt returned %d\n", err
);
733 * A data_ready event on a listening socket means there's a connection
734 * pending. Do not use state_change as a substitute for it.
736 static void svc_tcp_listen_data_ready(struct sock
*sk
)
738 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
740 dprintk("svc: socket %p TCP (listen) state change %d\n",
746 * This callback may called twice when a new connection
747 * is established as a child socket inherits everything
748 * from a parent LISTEN socket.
749 * 1) data_ready method of the parent socket will be called
750 * when one of child sockets become ESTABLISHED.
751 * 2) data_ready method of the child socket may be called
752 * when it receives data before the socket is accepted.
753 * In case of 2, we should ignore it silently.
755 if (sk
->sk_state
== TCP_LISTEN
) {
757 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
758 svc_xprt_enqueue(&svsk
->sk_xprt
);
760 printk("svc: socket %p: no user data\n", sk
);
765 * A state change on a connected socket means it's dying or dead.
767 static void svc_tcp_state_change(struct sock
*sk
)
769 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
771 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
772 sk
, sk
->sk_state
, sk
->sk_user_data
);
775 printk("svc: socket %p: no user data\n", sk
);
778 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
779 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
780 svc_xprt_enqueue(&svsk
->sk_xprt
);
786 * Accept a TCP connection
788 static struct svc_xprt
*svc_tcp_accept(struct svc_xprt
*xprt
)
790 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
791 struct sockaddr_storage addr
;
792 struct sockaddr
*sin
= (struct sockaddr
*) &addr
;
793 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
794 struct socket
*sock
= svsk
->sk_sock
;
795 struct socket
*newsock
;
796 struct svc_sock
*newsvsk
;
798 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
800 dprintk("svc: tcp_accept %p sock %p\n", svsk
, sock
);
804 clear_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
805 err
= kernel_accept(sock
, &newsock
, O_NONBLOCK
);
808 printk(KERN_WARNING
"%s: no more sockets!\n",
810 else if (err
!= -EAGAIN
)
811 net_warn_ratelimited("%s: accept failed (err %d)!\n",
812 serv
->sv_name
, -err
);
815 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
817 err
= kernel_getpeername(newsock
, sin
, &slen
);
819 net_warn_ratelimited("%s: peername failed (err %d)!\n",
820 serv
->sv_name
, -err
);
821 goto failed
; /* aborted connection or whatever */
824 /* Ideally, we would want to reject connections from unauthorized
825 * hosts here, but when we get encryption, the IP of the host won't
826 * tell us anything. For now just warn about unpriv connections.
828 if (!svc_port_is_privileged(sin
)) {
829 dprintk("%s: connect from unprivileged port: %s\n",
831 __svc_print_addr(sin
, buf
, sizeof(buf
)));
833 dprintk("%s: connect from %s\n", serv
->sv_name
,
834 __svc_print_addr(sin
, buf
, sizeof(buf
)));
836 /* Reset the inherited callbacks before calling svc_setup_socket */
837 newsock
->sk
->sk_state_change
= svsk
->sk_ostate
;
838 newsock
->sk
->sk_data_ready
= svsk
->sk_odata
;
839 newsock
->sk
->sk_write_space
= svsk
->sk_owspace
;
841 /* make sure that a write doesn't block forever when
844 newsock
->sk
->sk_sndtimeo
= HZ
*30;
846 newsvsk
= svc_setup_socket(serv
, newsock
,
847 (SVC_SOCK_ANONYMOUS
| SVC_SOCK_TEMPORARY
));
850 svc_xprt_set_remote(&newsvsk
->sk_xprt
, sin
, slen
);
851 err
= kernel_getsockname(newsock
, sin
, &slen
);
852 if (unlikely(err
< 0)) {
853 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err
);
854 slen
= offsetof(struct sockaddr
, sa_data
);
856 svc_xprt_set_local(&newsvsk
->sk_xprt
, sin
, slen
);
858 if (sock_is_loopback(newsock
->sk
))
859 set_bit(XPT_LOCAL
, &newsvsk
->sk_xprt
.xpt_flags
);
861 clear_bit(XPT_LOCAL
, &newsvsk
->sk_xprt
.xpt_flags
);
863 serv
->sv_stats
->nettcpconn
++;
865 return &newsvsk
->sk_xprt
;
868 sock_release(newsock
);
872 static unsigned int svc_tcp_restore_pages(struct svc_sock
*svsk
, struct svc_rqst
*rqstp
)
874 unsigned int i
, len
, npages
;
876 if (svsk
->sk_datalen
== 0)
878 len
= svsk
->sk_datalen
;
879 npages
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
880 for (i
= 0; i
< npages
; i
++) {
881 if (rqstp
->rq_pages
[i
] != NULL
)
882 put_page(rqstp
->rq_pages
[i
]);
883 BUG_ON(svsk
->sk_pages
[i
] == NULL
);
884 rqstp
->rq_pages
[i
] = svsk
->sk_pages
[i
];
885 svsk
->sk_pages
[i
] = NULL
;
887 rqstp
->rq_arg
.head
[0].iov_base
= page_address(rqstp
->rq_pages
[0]);
891 static void svc_tcp_save_pages(struct svc_sock
*svsk
, struct svc_rqst
*rqstp
)
893 unsigned int i
, len
, npages
;
895 if (svsk
->sk_datalen
== 0)
897 len
= svsk
->sk_datalen
;
898 npages
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
899 for (i
= 0; i
< npages
; i
++) {
900 svsk
->sk_pages
[i
] = rqstp
->rq_pages
[i
];
901 rqstp
->rq_pages
[i
] = NULL
;
905 static void svc_tcp_clear_pages(struct svc_sock
*svsk
)
907 unsigned int i
, len
, npages
;
909 if (svsk
->sk_datalen
== 0)
911 len
= svsk
->sk_datalen
;
912 npages
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
913 for (i
= 0; i
< npages
; i
++) {
914 if (svsk
->sk_pages
[i
] == NULL
) {
918 put_page(svsk
->sk_pages
[i
]);
919 svsk
->sk_pages
[i
] = NULL
;
923 svsk
->sk_datalen
= 0;
927 * Receive fragment record header.
928 * If we haven't gotten the record length yet, get the next four bytes.
930 static int svc_tcp_recv_record(struct svc_sock
*svsk
, struct svc_rqst
*rqstp
)
932 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
936 if (svsk
->sk_tcplen
< sizeof(rpc_fraghdr
)) {
939 want
= sizeof(rpc_fraghdr
) - svsk
->sk_tcplen
;
940 iov
.iov_base
= ((char *) &svsk
->sk_reclen
) + svsk
->sk_tcplen
;
942 if ((len
= svc_recvfrom(rqstp
, &iov
, 1, want
)) < 0)
944 svsk
->sk_tcplen
+= len
;
947 dprintk("svc: short recvfrom while reading record "
948 "length (%d of %d)\n", len
, want
);
952 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk
));
953 if (svc_sock_reclen(svsk
) + svsk
->sk_datalen
>
955 net_notice_ratelimited("RPC: fragment too large: %d\n",
956 svc_sock_reclen(svsk
));
961 return svc_sock_reclen(svsk
);
963 dprintk("RPC: TCP recv_record got %d\n", len
);
966 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
970 static int receive_cb_reply(struct svc_sock
*svsk
, struct svc_rqst
*rqstp
)
972 struct rpc_xprt
*bc_xprt
= svsk
->sk_xprt
.xpt_bc_xprt
;
973 struct rpc_rqst
*req
= NULL
;
974 struct kvec
*src
, *dst
;
975 __be32
*p
= (__be32
*)rqstp
->rq_arg
.head
[0].iov_base
;
984 spin_lock_bh(&bc_xprt
->transport_lock
);
985 req
= xprt_lookup_rqst(bc_xprt
, xid
);
987 goto unlock_notfound
;
989 memcpy(&req
->rq_private_buf
, &req
->rq_rcv_buf
, sizeof(struct xdr_buf
));
991 * XXX!: cheating for now! Only copying HEAD.
992 * But we know this is good enough for now (in fact, for any
993 * callback reply in the forseeable future).
995 dst
= &req
->rq_private_buf
.head
[0];
996 src
= &rqstp
->rq_arg
.head
[0];
997 if (dst
->iov_len
< src
->iov_len
)
998 goto unlock_eagain
; /* whatever; just giving up. */
999 memcpy(dst
->iov_base
, src
->iov_base
, src
->iov_len
);
1000 xprt_complete_rqst(req
->rq_task
, rqstp
->rq_arg
.len
);
1001 rqstp
->rq_arg
.len
= 0;
1002 spin_unlock_bh(&bc_xprt
->transport_lock
);
1006 "%s: Got unrecognized reply: "
1007 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1008 __func__
, ntohl(calldir
),
1009 bc_xprt
, ntohl(xid
));
1011 spin_unlock_bh(&bc_xprt
->transport_lock
);
1015 static int copy_pages_to_kvecs(struct kvec
*vec
, struct page
**pages
, int len
)
1021 vec
[i
].iov_base
= page_address(pages
[i
]);
1022 vec
[i
].iov_len
= PAGE_SIZE
;
1029 static void svc_tcp_fragment_received(struct svc_sock
*svsk
)
1031 /* If we have more data, signal svc_xprt_enqueue() to try again */
1032 dprintk("svc: TCP %s record (%d bytes)\n",
1033 svc_sock_final_rec(svsk
) ? "final" : "nonfinal",
1034 svc_sock_reclen(svsk
));
1035 svsk
->sk_tcplen
= 0;
1036 svsk
->sk_reclen
= 0;
1040 * Receive data from a TCP socket.
1042 static int svc_tcp_recvfrom(struct svc_rqst
*rqstp
)
1044 struct svc_sock
*svsk
=
1045 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
1046 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
1049 unsigned int want
, base
;
1054 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1055 svsk
, test_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
),
1056 test_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
),
1057 test_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
));
1059 len
= svc_tcp_recv_record(svsk
, rqstp
);
1063 base
= svc_tcp_restore_pages(svsk
, rqstp
);
1064 want
= svc_sock_reclen(svsk
) - (svsk
->sk_tcplen
- sizeof(rpc_fraghdr
));
1066 vec
= rqstp
->rq_vec
;
1068 pnum
= copy_pages_to_kvecs(&vec
[0], &rqstp
->rq_pages
[0],
1069 svsk
->sk_datalen
+ want
);
1071 rqstp
->rq_respages
= &rqstp
->rq_pages
[pnum
];
1072 rqstp
->rq_next_page
= rqstp
->rq_respages
+ 1;
1074 /* Now receive data */
1075 len
= svc_partial_recvfrom(rqstp
, vec
, pnum
, want
, base
);
1077 svsk
->sk_tcplen
+= len
;
1078 svsk
->sk_datalen
+= len
;
1080 if (len
!= want
|| !svc_sock_final_rec(svsk
)) {
1081 svc_tcp_save_pages(svsk
, rqstp
);
1082 if (len
< 0 && len
!= -EAGAIN
)
1085 svc_tcp_fragment_received(svsk
);
1087 dprintk("svc: incomplete TCP record (%d of %d)\n",
1088 (int)(svsk
->sk_tcplen
- sizeof(rpc_fraghdr
)),
1089 svc_sock_reclen(svsk
));
1093 if (svsk
->sk_datalen
< 8) {
1094 svsk
->sk_datalen
= 0;
1095 goto err_delete
; /* client is nuts. */
1098 rqstp
->rq_arg
.len
= svsk
->sk_datalen
;
1099 rqstp
->rq_arg
.page_base
= 0;
1100 if (rqstp
->rq_arg
.len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
1101 rqstp
->rq_arg
.head
[0].iov_len
= rqstp
->rq_arg
.len
;
1102 rqstp
->rq_arg
.page_len
= 0;
1104 rqstp
->rq_arg
.page_len
= rqstp
->rq_arg
.len
- rqstp
->rq_arg
.head
[0].iov_len
;
1106 rqstp
->rq_xprt_ctxt
= NULL
;
1107 rqstp
->rq_prot
= IPPROTO_TCP
;
1108 if (test_bit(XPT_LOCAL
, &svsk
->sk_xprt
.xpt_flags
))
1109 set_bit(RQ_LOCAL
, &rqstp
->rq_flags
);
1111 clear_bit(RQ_LOCAL
, &rqstp
->rq_flags
);
1113 p
= (__be32
*)rqstp
->rq_arg
.head
[0].iov_base
;
1116 len
= receive_cb_reply(svsk
, rqstp
);
1118 /* Reset TCP read info */
1119 svsk
->sk_datalen
= 0;
1120 svc_tcp_fragment_received(svsk
);
1125 svc_xprt_copy_addrs(rqstp
, &svsk
->sk_xprt
);
1127 serv
->sv_stats
->nettcpcnt
++;
1129 return rqstp
->rq_arg
.len
;
1134 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1137 printk(KERN_NOTICE
"%s: recvfrom returned errno %d\n",
1138 svsk
->sk_xprt
.xpt_server
->sv_name
, -len
);
1139 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1141 return 0; /* record not complete */
1145 * Send out data on TCP socket.
1147 static int svc_tcp_sendto(struct svc_rqst
*rqstp
)
1149 struct xdr_buf
*xbufp
= &rqstp
->rq_res
;
1153 /* Set up the first element of the reply kvec.
1154 * Any other kvecs that may be in use have been taken
1155 * care of by the server implementation itself.
1157 reclen
= htonl(0x80000000|((xbufp
->len
) - 4));
1158 memcpy(xbufp
->head
[0].iov_base
, &reclen
, 4);
1160 sent
= svc_sendto(rqstp
, &rqstp
->rq_res
);
1161 if (sent
!= xbufp
->len
) {
1163 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1164 "- shutting down socket\n",
1165 rqstp
->rq_xprt
->xpt_server
->sv_name
,
1166 (sent
<0)?"got error":"sent only",
1168 set_bit(XPT_CLOSE
, &rqstp
->rq_xprt
->xpt_flags
);
1169 svc_xprt_enqueue(rqstp
->rq_xprt
);
1176 * Setup response header. TCP has a 4B record length field.
1178 static void svc_tcp_prep_reply_hdr(struct svc_rqst
*rqstp
)
1180 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1182 /* tcp needs a space for the record length... */
1186 static struct svc_xprt
*svc_tcp_create(struct svc_serv
*serv
,
1188 struct sockaddr
*sa
, int salen
,
1191 return svc_create_socket(serv
, IPPROTO_TCP
, net
, sa
, salen
, flags
);
1194 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1195 static struct svc_xprt
*svc_bc_create_socket(struct svc_serv
*, int,
1196 struct net
*, struct sockaddr
*,
1198 static void svc_bc_sock_free(struct svc_xprt
*xprt
);
1200 static struct svc_xprt
*svc_bc_tcp_create(struct svc_serv
*serv
,
1202 struct sockaddr
*sa
, int salen
,
1205 return svc_bc_create_socket(serv
, IPPROTO_TCP
, net
, sa
, salen
, flags
);
1208 static void svc_bc_tcp_sock_detach(struct svc_xprt
*xprt
)
1212 static struct svc_xprt_ops svc_tcp_bc_ops
= {
1213 .xpo_create
= svc_bc_tcp_create
,
1214 .xpo_detach
= svc_bc_tcp_sock_detach
,
1215 .xpo_free
= svc_bc_sock_free
,
1216 .xpo_prep_reply_hdr
= svc_tcp_prep_reply_hdr
,
1217 .xpo_secure_port
= svc_sock_secure_port
,
1220 static struct svc_xprt_class svc_tcp_bc_class
= {
1221 .xcl_name
= "tcp-bc",
1222 .xcl_owner
= THIS_MODULE
,
1223 .xcl_ops
= &svc_tcp_bc_ops
,
1224 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_TCP
,
1227 static void svc_init_bc_xprt_sock(void)
1229 svc_reg_xprt_class(&svc_tcp_bc_class
);
1232 static void svc_cleanup_bc_xprt_sock(void)
1234 svc_unreg_xprt_class(&svc_tcp_bc_class
);
1236 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1237 static void svc_init_bc_xprt_sock(void)
1241 static void svc_cleanup_bc_xprt_sock(void)
1244 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1246 static struct svc_xprt_ops svc_tcp_ops
= {
1247 .xpo_create
= svc_tcp_create
,
1248 .xpo_recvfrom
= svc_tcp_recvfrom
,
1249 .xpo_sendto
= svc_tcp_sendto
,
1250 .xpo_release_rqst
= svc_release_skb
,
1251 .xpo_detach
= svc_tcp_sock_detach
,
1252 .xpo_free
= svc_sock_free
,
1253 .xpo_prep_reply_hdr
= svc_tcp_prep_reply_hdr
,
1254 .xpo_has_wspace
= svc_tcp_has_wspace
,
1255 .xpo_accept
= svc_tcp_accept
,
1256 .xpo_secure_port
= svc_sock_secure_port
,
1259 static struct svc_xprt_class svc_tcp_class
= {
1261 .xcl_owner
= THIS_MODULE
,
1262 .xcl_ops
= &svc_tcp_ops
,
1263 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_TCP
,
1264 .xcl_ident
= XPRT_TRANSPORT_TCP
,
1267 void svc_init_xprt_sock(void)
1269 svc_reg_xprt_class(&svc_tcp_class
);
1270 svc_reg_xprt_class(&svc_udp_class
);
1271 svc_init_bc_xprt_sock();
1274 void svc_cleanup_xprt_sock(void)
1276 svc_unreg_xprt_class(&svc_tcp_class
);
1277 svc_unreg_xprt_class(&svc_udp_class
);
1278 svc_cleanup_bc_xprt_sock();
1281 static void svc_tcp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
1283 struct sock
*sk
= svsk
->sk_sk
;
1285 svc_xprt_init(sock_net(svsk
->sk_sock
->sk
), &svc_tcp_class
,
1286 &svsk
->sk_xprt
, serv
);
1287 set_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
1288 if (sk
->sk_state
== TCP_LISTEN
) {
1289 dprintk("setting up TCP socket for listening\n");
1290 set_bit(XPT_LISTENER
, &svsk
->sk_xprt
.xpt_flags
);
1291 sk
->sk_data_ready
= svc_tcp_listen_data_ready
;
1292 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
1294 dprintk("setting up TCP socket for reading\n");
1295 sk
->sk_state_change
= svc_tcp_state_change
;
1296 sk
->sk_data_ready
= svc_data_ready
;
1297 sk
->sk_write_space
= svc_write_space
;
1299 svsk
->sk_reclen
= 0;
1300 svsk
->sk_tcplen
= 0;
1301 svsk
->sk_datalen
= 0;
1302 memset(&svsk
->sk_pages
[0], 0, sizeof(svsk
->sk_pages
));
1304 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1306 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1307 switch (sk
->sk_state
) {
1309 case TCP_ESTABLISHED
:
1312 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1317 void svc_sock_update_bufs(struct svc_serv
*serv
)
1320 * The number of server threads has changed. Update
1321 * rcvbuf and sndbuf accordingly on all sockets
1323 struct svc_sock
*svsk
;
1325 spin_lock_bh(&serv
->sv_lock
);
1326 list_for_each_entry(svsk
, &serv
->sv_permsocks
, sk_xprt
.xpt_list
)
1327 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1328 spin_unlock_bh(&serv
->sv_lock
);
1330 EXPORT_SYMBOL_GPL(svc_sock_update_bufs
);
1333 * Initialize socket for RPC use and create svc_sock struct
1335 static struct svc_sock
*svc_setup_socket(struct svc_serv
*serv
,
1336 struct socket
*sock
,
1339 struct svc_sock
*svsk
;
1341 int pmap_register
= !(flags
& SVC_SOCK_ANONYMOUS
);
1344 dprintk("svc: svc_setup_socket %p\n", sock
);
1345 svsk
= kzalloc(sizeof(*svsk
), GFP_KERNEL
);
1347 return ERR_PTR(-ENOMEM
);
1351 /* Register socket with portmapper */
1353 err
= svc_register(serv
, sock_net(sock
->sk
), inet
->sk_family
,
1355 ntohs(inet_sk(inet
)->inet_sport
));
1359 return ERR_PTR(err
);
1362 inet
->sk_user_data
= svsk
;
1363 svsk
->sk_sock
= sock
;
1365 svsk
->sk_ostate
= inet
->sk_state_change
;
1366 svsk
->sk_odata
= inet
->sk_data_ready
;
1367 svsk
->sk_owspace
= inet
->sk_write_space
;
1369 /* Initialize the socket */
1370 if (sock
->type
== SOCK_DGRAM
)
1371 svc_udp_init(svsk
, serv
);
1373 svc_tcp_init(svsk
, serv
);
1375 dprintk("svc: svc_setup_socket created %p (inet %p), "
1376 "listen %d close %d\n",
1378 test_bit(XPT_LISTENER
, &svsk
->sk_xprt
.xpt_flags
),
1379 test_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
));
1384 bool svc_alien_sock(struct net
*net
, int fd
)
1387 struct socket
*sock
= sockfd_lookup(fd
, &err
);
1392 if (sock_net(sock
->sk
) != net
)
1398 EXPORT_SYMBOL_GPL(svc_alien_sock
);
1401 * svc_addsock - add a listener socket to an RPC service
1402 * @serv: pointer to RPC service to which to add a new listener
1403 * @fd: file descriptor of the new listener
1404 * @name_return: pointer to buffer to fill in with name of listener
1405 * @len: size of the buffer
1407 * Fills in socket name and returns positive length of name if successful.
1408 * Name is terminated with '\n'. On error, returns a negative errno
1411 int svc_addsock(struct svc_serv
*serv
, const int fd
, char *name_return
,
1415 struct socket
*so
= sockfd_lookup(fd
, &err
);
1416 struct svc_sock
*svsk
= NULL
;
1417 struct sockaddr_storage addr
;
1418 struct sockaddr
*sin
= (struct sockaddr
*)&addr
;
1423 err
= -EAFNOSUPPORT
;
1424 if ((so
->sk
->sk_family
!= PF_INET
) && (so
->sk
->sk_family
!= PF_INET6
))
1426 err
= -EPROTONOSUPPORT
;
1427 if (so
->sk
->sk_protocol
!= IPPROTO_TCP
&&
1428 so
->sk
->sk_protocol
!= IPPROTO_UDP
)
1431 if (so
->state
> SS_UNCONNECTED
)
1434 if (!try_module_get(THIS_MODULE
))
1436 svsk
= svc_setup_socket(serv
, so
, SVC_SOCK_DEFAULTS
);
1438 module_put(THIS_MODULE
);
1439 err
= PTR_ERR(svsk
);
1442 if (kernel_getsockname(svsk
->sk_sock
, sin
, &salen
) == 0)
1443 svc_xprt_set_local(&svsk
->sk_xprt
, sin
, salen
);
1444 svc_add_new_perm_xprt(serv
, &svsk
->sk_xprt
);
1445 return svc_one_sock_name(svsk
, name_return
, len
);
1450 EXPORT_SYMBOL_GPL(svc_addsock
);
1453 * Create socket for RPC service.
1455 static struct svc_xprt
*svc_create_socket(struct svc_serv
*serv
,
1458 struct sockaddr
*sin
, int len
,
1461 struct svc_sock
*svsk
;
1462 struct socket
*sock
;
1465 struct sockaddr_storage addr
;
1466 struct sockaddr
*newsin
= (struct sockaddr
*)&addr
;
1470 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
1472 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1473 serv
->sv_program
->pg_name
, protocol
,
1474 __svc_print_addr(sin
, buf
, sizeof(buf
)));
1476 if (protocol
!= IPPROTO_UDP
&& protocol
!= IPPROTO_TCP
) {
1477 printk(KERN_WARNING
"svc: only UDP and TCP "
1478 "sockets supported\n");
1479 return ERR_PTR(-EINVAL
);
1482 type
= (protocol
== IPPROTO_UDP
)? SOCK_DGRAM
: SOCK_STREAM
;
1483 switch (sin
->sa_family
) {
1491 return ERR_PTR(-EINVAL
);
1494 error
= __sock_create(net
, family
, type
, protocol
, &sock
, 1);
1496 return ERR_PTR(error
);
1498 svc_reclassify_socket(sock
);
1501 * If this is an PF_INET6 listener, we want to avoid
1502 * getting requests from IPv4 remotes. Those should
1503 * be shunted to a PF_INET listener via rpcbind.
1506 if (family
== PF_INET6
)
1507 kernel_setsockopt(sock
, SOL_IPV6
, IPV6_V6ONLY
,
1508 (char *)&val
, sizeof(val
));
1510 if (type
== SOCK_STREAM
)
1511 sock
->sk
->sk_reuse
= SK_CAN_REUSE
; /* allow address reuse */
1512 error
= kernel_bind(sock
, sin
, len
);
1517 error
= kernel_getsockname(sock
, newsin
, &newlen
);
1521 if (protocol
== IPPROTO_TCP
) {
1522 if ((error
= kernel_listen(sock
, 64)) < 0)
1526 svsk
= svc_setup_socket(serv
, sock
, flags
);
1528 error
= PTR_ERR(svsk
);
1531 svc_xprt_set_local(&svsk
->sk_xprt
, newsin
, newlen
);
1532 return (struct svc_xprt
*)svsk
;
1534 dprintk("svc: svc_create_socket error = %d\n", -error
);
1536 return ERR_PTR(error
);
1540 * Detach the svc_sock from the socket so that no
1541 * more callbacks occur.
1543 static void svc_sock_detach(struct svc_xprt
*xprt
)
1545 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1546 struct sock
*sk
= svsk
->sk_sk
;
1548 dprintk("svc: svc_sock_detach(%p)\n", svsk
);
1550 /* put back the old socket callbacks */
1552 sk
->sk_state_change
= svsk
->sk_ostate
;
1553 sk
->sk_data_ready
= svsk
->sk_odata
;
1554 sk
->sk_write_space
= svsk
->sk_owspace
;
1555 sk
->sk_user_data
= NULL
;
1560 * Disconnect the socket, and reset the callbacks
1562 static void svc_tcp_sock_detach(struct svc_xprt
*xprt
)
1564 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1566 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk
);
1568 svc_sock_detach(xprt
);
1570 if (!test_bit(XPT_LISTENER
, &xprt
->xpt_flags
)) {
1571 svc_tcp_clear_pages(svsk
);
1572 kernel_sock_shutdown(svsk
->sk_sock
, SHUT_RDWR
);
1577 * Free the svc_sock's socket resources and the svc_sock itself.
1579 static void svc_sock_free(struct svc_xprt
*xprt
)
1581 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1582 dprintk("svc: svc_sock_free(%p)\n", svsk
);
1584 if (svsk
->sk_sock
->file
)
1585 sockfd_put(svsk
->sk_sock
);
1587 sock_release(svsk
->sk_sock
);
1591 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1593 * Create a back channel svc_xprt which shares the fore channel socket.
1595 static struct svc_xprt
*svc_bc_create_socket(struct svc_serv
*serv
,
1598 struct sockaddr
*sin
, int len
,
1601 struct svc_sock
*svsk
;
1602 struct svc_xprt
*xprt
;
1604 if (protocol
!= IPPROTO_TCP
) {
1605 printk(KERN_WARNING
"svc: only TCP sockets"
1606 " supported on shared back channel\n");
1607 return ERR_PTR(-EINVAL
);
1610 svsk
= kzalloc(sizeof(*svsk
), GFP_KERNEL
);
1612 return ERR_PTR(-ENOMEM
);
1614 xprt
= &svsk
->sk_xprt
;
1615 svc_xprt_init(net
, &svc_tcp_bc_class
, xprt
, serv
);
1617 serv
->sv_bc_xprt
= xprt
;
1623 * Free a back channel svc_sock.
1625 static void svc_bc_sock_free(struct svc_xprt
*xprt
)
1628 kfree(container_of(xprt
, struct svc_sock
, sk_xprt
));
1630 #endif /* CONFIG_SUNRPC_BACKCHANNEL */