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/errno.h>
25 #include <linux/fcntl.h>
26 #include <linux/net.h>
28 #include <linux/inet.h>
29 #include <linux/udp.h>
30 #include <linux/tcp.h>
31 #include <linux/unistd.h>
32 #include <linux/slab.h>
33 #include <linux/netdevice.h>
34 #include <linux/skbuff.h>
35 #include <linux/file.h>
36 #include <linux/freezer.h>
38 #include <net/checksum.h>
42 #include <net/tcp_states.h>
43 #include <asm/uaccess.h>
44 #include <asm/ioctls.h>
46 #include <linux/sunrpc/types.h>
47 #include <linux/sunrpc/clnt.h>
48 #include <linux/sunrpc/xdr.h>
49 #include <linux/sunrpc/msg_prot.h>
50 #include <linux/sunrpc/svcsock.h>
51 #include <linux/sunrpc/stats.h>
53 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
56 static struct svc_sock
*svc_setup_socket(struct svc_serv
*, struct socket
*,
57 int *errp
, int flags
);
58 static void svc_udp_data_ready(struct sock
*, int);
59 static int svc_udp_recvfrom(struct svc_rqst
*);
60 static int svc_udp_sendto(struct svc_rqst
*);
61 static void svc_sock_detach(struct svc_xprt
*);
62 static void svc_tcp_sock_detach(struct svc_xprt
*);
63 static void svc_sock_free(struct svc_xprt
*);
65 static struct svc_xprt
*svc_create_socket(struct svc_serv
*, int,
66 struct sockaddr
*, int, int);
67 #ifdef CONFIG_DEBUG_LOCK_ALLOC
68 static struct lock_class_key svc_key
[2];
69 static struct lock_class_key svc_slock_key
[2];
71 static void svc_reclassify_socket(struct socket
*sock
)
73 struct sock
*sk
= sock
->sk
;
74 BUG_ON(sock_owned_by_user(sk
));
75 switch (sk
->sk_family
) {
77 sock_lock_init_class_and_name(sk
, "slock-AF_INET-NFSD",
79 "sk_xprt.xpt_lock-AF_INET-NFSD",
84 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-NFSD",
86 "sk_xprt.xpt_lock-AF_INET6-NFSD",
95 static void svc_reclassify_socket(struct socket
*sock
)
101 * Release an skbuff after use
103 static void svc_release_skb(struct svc_rqst
*rqstp
)
105 struct sk_buff
*skb
= rqstp
->rq_xprt_ctxt
;
108 struct svc_sock
*svsk
=
109 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
110 rqstp
->rq_xprt_ctxt
= NULL
;
112 dprintk("svc: service %p, releasing skb %p\n", rqstp
, skb
);
113 skb_free_datagram(svsk
->sk_sk
, skb
);
117 union svc_pktinfo_u
{
118 struct in_pktinfo pkti
;
119 struct in6_pktinfo pkti6
;
121 #define SVC_PKTINFO_SPACE \
122 CMSG_SPACE(sizeof(union svc_pktinfo_u))
124 static void svc_set_cmsg_data(struct svc_rqst
*rqstp
, struct cmsghdr
*cmh
)
126 struct svc_sock
*svsk
=
127 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
128 switch (svsk
->sk_sk
->sk_family
) {
130 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
132 cmh
->cmsg_level
= SOL_IP
;
133 cmh
->cmsg_type
= IP_PKTINFO
;
134 pki
->ipi_ifindex
= 0;
135 pki
->ipi_spec_dst
.s_addr
= rqstp
->rq_daddr
.addr
.s_addr
;
136 cmh
->cmsg_len
= CMSG_LEN(sizeof(*pki
));
141 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
143 cmh
->cmsg_level
= SOL_IPV6
;
144 cmh
->cmsg_type
= IPV6_PKTINFO
;
145 pki
->ipi6_ifindex
= 0;
146 ipv6_addr_copy(&pki
->ipi6_addr
,
147 &rqstp
->rq_daddr
.addr6
);
148 cmh
->cmsg_len
= CMSG_LEN(sizeof(*pki
));
156 * Generic sendto routine
158 static int svc_sendto(struct svc_rqst
*rqstp
, struct xdr_buf
*xdr
)
160 struct svc_sock
*svsk
=
161 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
162 struct socket
*sock
= svsk
->sk_sock
;
166 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
168 struct cmsghdr
*cmh
= &buffer
.hdr
;
172 struct page
**ppage
= xdr
->pages
;
173 size_t base
= xdr
->page_base
;
174 unsigned int pglen
= xdr
->page_len
;
175 unsigned int flags
= MSG_MORE
;
176 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
180 if (rqstp
->rq_prot
== IPPROTO_UDP
) {
181 struct msghdr msg
= {
182 .msg_name
= &rqstp
->rq_addr
,
183 .msg_namelen
= rqstp
->rq_addrlen
,
185 .msg_controllen
= sizeof(buffer
),
186 .msg_flags
= MSG_MORE
,
189 svc_set_cmsg_data(rqstp
, cmh
);
191 if (sock_sendmsg(sock
, &msg
, 0) < 0)
196 if (slen
== xdr
->head
[0].iov_len
)
198 len
= kernel_sendpage(sock
, rqstp
->rq_respages
[0], 0,
199 xdr
->head
[0].iov_len
, flags
);
200 if (len
!= xdr
->head
[0].iov_len
)
202 slen
-= xdr
->head
[0].iov_len
;
207 size
= PAGE_SIZE
- base
< pglen
? PAGE_SIZE
- base
: pglen
;
211 result
= kernel_sendpage(sock
, *ppage
, base
, size
, flags
);
218 size
= PAGE_SIZE
< pglen
? PAGE_SIZE
: pglen
;
223 if (xdr
->tail
[0].iov_len
) {
224 result
= kernel_sendpage(sock
, rqstp
->rq_respages
[0],
225 ((unsigned long)xdr
->tail
[0].iov_base
)
227 xdr
->tail
[0].iov_len
, 0);
233 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
234 svsk
, xdr
->head
[0].iov_base
, xdr
->head
[0].iov_len
,
235 xdr
->len
, len
, svc_print_addr(rqstp
, buf
, sizeof(buf
)));
241 * Report socket names for nfsdfs
243 static int svc_one_sock_name(struct svc_sock
*svsk
, char *buf
, int remaining
)
247 switch(svsk
->sk_sk
->sk_family
) {
249 len
= snprintf(buf
, remaining
, "ipv4 %s %pI4 %d\n",
250 svsk
->sk_sk
->sk_protocol
== IPPROTO_UDP
?
252 &inet_sk(svsk
->sk_sk
)->rcv_saddr
,
253 inet_sk(svsk
->sk_sk
)->num
);
256 len
= snprintf(buf
, remaining
, "*unknown-%d*\n",
257 svsk
->sk_sk
->sk_family
);
260 if (len
>= remaining
) {
262 return -ENAMETOOLONG
;
268 * svc_sock_names - construct a list of listener names in a string
269 * @serv: pointer to RPC service
270 * @buf: pointer to a buffer to fill in with socket names
271 * @buflen: size of the buffer to be filled
272 * @toclose: pointer to '\0'-terminated C string containing the name
273 * of a listener to be closed
275 * Fills in @buf with a '\n'-separated list of names of listener
276 * sockets. If @toclose is not NULL, the socket named by @toclose
277 * is closed, and is not included in the output list.
279 * Returns positive length of the socket name string, or a negative
280 * errno value on error.
282 int svc_sock_names(struct svc_serv
*serv
, char *buf
, const size_t buflen
,
285 struct svc_sock
*svsk
, *closesk
= NULL
;
291 spin_lock_bh(&serv
->sv_lock
);
292 list_for_each_entry(svsk
, &serv
->sv_permsocks
, sk_xprt
.xpt_list
) {
293 int onelen
= svc_one_sock_name(svsk
, buf
+ len
, buflen
- len
);
298 if (toclose
&& strcmp(toclose
, buf
+ len
) == 0)
303 spin_unlock_bh(&serv
->sv_lock
);
306 /* Should unregister with portmap, but you cannot
307 * unregister just one protocol...
309 svc_close_xprt(&closesk
->sk_xprt
);
314 EXPORT_SYMBOL_GPL(svc_sock_names
);
317 * Check input queue length
319 static int svc_recv_available(struct svc_sock
*svsk
)
321 struct socket
*sock
= svsk
->sk_sock
;
324 err
= kernel_sock_ioctl(sock
, TIOCINQ
, (unsigned long) &avail
);
326 return (err
>= 0)? avail
: err
;
330 * Generic recvfrom routine.
332 static int svc_recvfrom(struct svc_rqst
*rqstp
, struct kvec
*iov
, int nr
,
335 struct svc_sock
*svsk
=
336 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
337 struct msghdr msg
= {
338 .msg_flags
= MSG_DONTWAIT
,
342 rqstp
->rq_xprt_hlen
= 0;
344 len
= kernel_recvmsg(svsk
->sk_sock
, &msg
, iov
, nr
, buflen
,
347 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
348 svsk
, iov
[0].iov_base
, iov
[0].iov_len
, len
);
353 * Set socket snd and rcv buffer lengths
355 static void svc_sock_setbufsize(struct socket
*sock
, unsigned int snd
,
360 oldfs
= get_fs(); set_fs(KERNEL_DS
);
361 sock_setsockopt(sock
, SOL_SOCKET
, SO_SNDBUF
,
362 (char*)&snd
, sizeof(snd
));
363 sock_setsockopt(sock
, SOL_SOCKET
, SO_RCVBUF
,
364 (char*)&rcv
, sizeof(rcv
));
366 /* sock_setsockopt limits use to sysctl_?mem_max,
367 * which isn't acceptable. Until that is made conditional
368 * on not having CAP_SYS_RESOURCE or similar, we go direct...
369 * DaveM said I could!
372 sock
->sk
->sk_sndbuf
= snd
* 2;
373 sock
->sk
->sk_rcvbuf
= rcv
* 2;
374 release_sock(sock
->sk
);
378 * INET callback when data has been received on the socket.
380 static void svc_udp_data_ready(struct sock
*sk
, int count
)
382 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
385 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
387 test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
));
388 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
389 svc_xprt_enqueue(&svsk
->sk_xprt
);
391 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
392 wake_up_interruptible(sk
->sk_sleep
);
396 * INET callback when space is newly available on the socket.
398 static void svc_write_space(struct sock
*sk
)
400 struct svc_sock
*svsk
= (struct svc_sock
*)(sk
->sk_user_data
);
403 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
404 svsk
, sk
, test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
));
405 svc_xprt_enqueue(&svsk
->sk_xprt
);
408 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
)) {
409 dprintk("RPC svc_write_space: someone sleeping on %p\n",
411 wake_up_interruptible(sk
->sk_sleep
);
416 * Copy the UDP datagram's destination address to the rqstp structure.
417 * The 'destination' address in this case is the address to which the
418 * peer sent the datagram, i.e. our local address. For multihomed
419 * hosts, this can change from msg to msg. Note that only the IP
420 * address changes, the port number should remain the same.
422 static void svc_udp_get_dest_address(struct svc_rqst
*rqstp
,
425 struct svc_sock
*svsk
=
426 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
427 switch (svsk
->sk_sk
->sk_family
) {
429 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
430 rqstp
->rq_daddr
.addr
.s_addr
= pki
->ipi_spec_dst
.s_addr
;
434 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
435 ipv6_addr_copy(&rqstp
->rq_daddr
.addr6
, &pki
->ipi6_addr
);
442 * Receive a datagram from a UDP socket.
444 static int svc_udp_recvfrom(struct svc_rqst
*rqstp
)
446 struct svc_sock
*svsk
=
447 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
448 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
452 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
454 struct cmsghdr
*cmh
= &buffer
.hdr
;
455 struct msghdr msg
= {
456 .msg_name
= svc_addr(rqstp
),
458 .msg_controllen
= sizeof(buffer
),
459 .msg_flags
= MSG_DONTWAIT
,
464 if (test_and_clear_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
))
465 /* udp sockets need large rcvbuf as all pending
466 * requests are still in that buffer. sndbuf must
467 * also be large enough that there is enough space
468 * for one reply per thread. We count all threads
469 * rather than threads in a particular pool, which
470 * provides an upper bound on the number of threads
471 * which will access the socket.
473 svc_sock_setbufsize(svsk
->sk_sock
,
474 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
,
475 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
);
477 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
479 err
= kernel_recvmsg(svsk
->sk_sock
, &msg
, NULL
,
480 0, 0, MSG_PEEK
| MSG_DONTWAIT
);
482 skb
= skb_recv_datagram(svsk
->sk_sk
, 0, 1, &err
);
485 if (err
!= -EAGAIN
) {
486 /* possibly an icmp error */
487 dprintk("svc: recvfrom returned error %d\n", -err
);
488 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
490 svc_xprt_received(&svsk
->sk_xprt
);
493 len
= svc_addr_len(svc_addr(rqstp
));
495 return -EAFNOSUPPORT
;
496 rqstp
->rq_addrlen
= len
;
497 if (skb
->tstamp
.tv64
== 0) {
498 skb
->tstamp
= ktime_get_real();
499 /* Don't enable netstamp, sunrpc doesn't
500 need that much accuracy */
502 svsk
->sk_sk
->sk_stamp
= skb
->tstamp
;
503 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
); /* there may be more data... */
506 * Maybe more packets - kick another thread ASAP.
508 svc_xprt_received(&svsk
->sk_xprt
);
510 len
= skb
->len
- sizeof(struct udphdr
);
511 rqstp
->rq_arg
.len
= len
;
513 rqstp
->rq_prot
= IPPROTO_UDP
;
515 if (cmh
->cmsg_level
!= IPPROTO_IP
||
516 cmh
->cmsg_type
!= IP_PKTINFO
) {
518 printk("rpcsvc: received unknown control message:"
520 cmh
->cmsg_level
, cmh
->cmsg_type
);
521 skb_free_datagram(svsk
->sk_sk
, skb
);
524 svc_udp_get_dest_address(rqstp
, cmh
);
526 if (skb_is_nonlinear(skb
)) {
527 /* we have to copy */
529 if (csum_partial_copy_to_xdr(&rqstp
->rq_arg
, skb
)) {
532 skb_free_datagram(svsk
->sk_sk
, skb
);
536 skb_free_datagram(svsk
->sk_sk
, skb
);
538 /* we can use it in-place */
539 rqstp
->rq_arg
.head
[0].iov_base
= skb
->data
+
540 sizeof(struct udphdr
);
541 rqstp
->rq_arg
.head
[0].iov_len
= len
;
542 if (skb_checksum_complete(skb
)) {
543 skb_free_datagram(svsk
->sk_sk
, skb
);
546 rqstp
->rq_xprt_ctxt
= skb
;
549 rqstp
->rq_arg
.page_base
= 0;
550 if (len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
551 rqstp
->rq_arg
.head
[0].iov_len
= len
;
552 rqstp
->rq_arg
.page_len
= 0;
553 rqstp
->rq_respages
= rqstp
->rq_pages
+1;
555 rqstp
->rq_arg
.page_len
= len
- rqstp
->rq_arg
.head
[0].iov_len
;
556 rqstp
->rq_respages
= rqstp
->rq_pages
+ 1 +
557 DIV_ROUND_UP(rqstp
->rq_arg
.page_len
, PAGE_SIZE
);
561 serv
->sv_stats
->netudpcnt
++;
567 svc_udp_sendto(struct svc_rqst
*rqstp
)
571 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
572 if (error
== -ECONNREFUSED
)
573 /* ICMP error on earlier request. */
574 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
579 static void svc_udp_prep_reply_hdr(struct svc_rqst
*rqstp
)
583 static int svc_udp_has_wspace(struct svc_xprt
*xprt
)
585 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
586 struct svc_serv
*serv
= xprt
->xpt_server
;
587 unsigned long required
;
590 * Set the SOCK_NOSPACE flag before checking the available
593 set_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
594 required
= atomic_read(&svsk
->sk_xprt
.xpt_reserved
) + serv
->sv_max_mesg
;
595 if (required
*2 > sock_wspace(svsk
->sk_sk
))
597 clear_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
601 static struct svc_xprt
*svc_udp_accept(struct svc_xprt
*xprt
)
607 static struct svc_xprt
*svc_udp_create(struct svc_serv
*serv
,
608 struct sockaddr
*sa
, int salen
,
611 return svc_create_socket(serv
, IPPROTO_UDP
, sa
, salen
, flags
);
614 static struct svc_xprt_ops svc_udp_ops
= {
615 .xpo_create
= svc_udp_create
,
616 .xpo_recvfrom
= svc_udp_recvfrom
,
617 .xpo_sendto
= svc_udp_sendto
,
618 .xpo_release_rqst
= svc_release_skb
,
619 .xpo_detach
= svc_sock_detach
,
620 .xpo_free
= svc_sock_free
,
621 .xpo_prep_reply_hdr
= svc_udp_prep_reply_hdr
,
622 .xpo_has_wspace
= svc_udp_has_wspace
,
623 .xpo_accept
= svc_udp_accept
,
626 static struct svc_xprt_class svc_udp_class
= {
628 .xcl_owner
= THIS_MODULE
,
629 .xcl_ops
= &svc_udp_ops
,
630 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_UDP
,
633 static void svc_udp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
638 svc_xprt_init(&svc_udp_class
, &svsk
->sk_xprt
, serv
);
639 clear_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
640 svsk
->sk_sk
->sk_data_ready
= svc_udp_data_ready
;
641 svsk
->sk_sk
->sk_write_space
= svc_write_space
;
643 /* initialise setting must have enough space to
644 * receive and respond to one request.
645 * svc_udp_recvfrom will re-adjust if necessary
647 svc_sock_setbufsize(svsk
->sk_sock
,
648 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
,
649 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
);
651 /* data might have come in before data_ready set up */
652 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
653 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
657 /* make sure we get destination address info */
658 svsk
->sk_sock
->ops
->setsockopt(svsk
->sk_sock
, IPPROTO_IP
, IP_PKTINFO
,
659 (char __user
*)&one
, sizeof(one
));
664 * A data_ready event on a listening socket means there's a connection
665 * pending. Do not use state_change as a substitute for it.
667 static void svc_tcp_listen_data_ready(struct sock
*sk
, int count_unused
)
669 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
671 dprintk("svc: socket %p TCP (listen) state change %d\n",
675 * This callback may called twice when a new connection
676 * is established as a child socket inherits everything
677 * from a parent LISTEN socket.
678 * 1) data_ready method of the parent socket will be called
679 * when one of child sockets become ESTABLISHED.
680 * 2) data_ready method of the child socket may be called
681 * when it receives data before the socket is accepted.
682 * In case of 2, we should ignore it silently.
684 if (sk
->sk_state
== TCP_LISTEN
) {
686 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
687 svc_xprt_enqueue(&svsk
->sk_xprt
);
689 printk("svc: socket %p: no user data\n", sk
);
692 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
693 wake_up_interruptible_all(sk
->sk_sleep
);
697 * A state change on a connected socket means it's dying or dead.
699 static void svc_tcp_state_change(struct sock
*sk
)
701 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
703 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
704 sk
, sk
->sk_state
, sk
->sk_user_data
);
707 printk("svc: socket %p: no user data\n", sk
);
709 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
710 svc_xprt_enqueue(&svsk
->sk_xprt
);
712 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
713 wake_up_interruptible_all(sk
->sk_sleep
);
716 static void svc_tcp_data_ready(struct sock
*sk
, int count
)
718 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
720 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
721 sk
, sk
->sk_user_data
);
723 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
724 svc_xprt_enqueue(&svsk
->sk_xprt
);
726 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
727 wake_up_interruptible(sk
->sk_sleep
);
731 * Accept a TCP connection
733 static struct svc_xprt
*svc_tcp_accept(struct svc_xprt
*xprt
)
735 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
736 struct sockaddr_storage addr
;
737 struct sockaddr
*sin
= (struct sockaddr
*) &addr
;
738 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
739 struct socket
*sock
= svsk
->sk_sock
;
740 struct socket
*newsock
;
741 struct svc_sock
*newsvsk
;
743 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
745 dprintk("svc: tcp_accept %p sock %p\n", svsk
, sock
);
749 clear_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
750 err
= kernel_accept(sock
, &newsock
, O_NONBLOCK
);
753 printk(KERN_WARNING
"%s: no more sockets!\n",
755 else if (err
!= -EAGAIN
&& net_ratelimit())
756 printk(KERN_WARNING
"%s: accept failed (err %d)!\n",
757 serv
->sv_name
, -err
);
760 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
762 err
= kernel_getpeername(newsock
, sin
, &slen
);
765 printk(KERN_WARNING
"%s: peername failed (err %d)!\n",
766 serv
->sv_name
, -err
);
767 goto failed
; /* aborted connection or whatever */
770 /* Ideally, we would want to reject connections from unauthorized
771 * hosts here, but when we get encryption, the IP of the host won't
772 * tell us anything. For now just warn about unpriv connections.
774 if (!svc_port_is_privileged(sin
)) {
776 "%s: connect from unprivileged port: %s\n",
778 __svc_print_addr(sin
, buf
, sizeof(buf
)));
780 dprintk("%s: connect from %s\n", serv
->sv_name
,
781 __svc_print_addr(sin
, buf
, sizeof(buf
)));
783 /* make sure that a write doesn't block forever when
786 newsock
->sk
->sk_sndtimeo
= HZ
*30;
788 if (!(newsvsk
= svc_setup_socket(serv
, newsock
, &err
,
789 (SVC_SOCK_ANONYMOUS
| SVC_SOCK_TEMPORARY
))))
791 svc_xprt_set_remote(&newsvsk
->sk_xprt
, sin
, slen
);
792 err
= kernel_getsockname(newsock
, sin
, &slen
);
793 if (unlikely(err
< 0)) {
794 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err
);
795 slen
= offsetof(struct sockaddr
, sa_data
);
797 svc_xprt_set_local(&newsvsk
->sk_xprt
, sin
, slen
);
800 serv
->sv_stats
->nettcpconn
++;
802 return &newsvsk
->sk_xprt
;
805 sock_release(newsock
);
810 * Receive data from a TCP socket.
812 static int svc_tcp_recvfrom(struct svc_rqst
*rqstp
)
814 struct svc_sock
*svsk
=
815 container_of(rqstp
->rq_xprt
, struct svc_sock
, sk_xprt
);
816 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
821 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
822 svsk
, test_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
),
823 test_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
),
824 test_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
));
826 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
828 /* Receive data. If we haven't got the record length yet, get
829 * the next four bytes. Otherwise try to gobble up as much as
830 * possible up to the complete record length.
832 if (svsk
->sk_tcplen
< sizeof(rpc_fraghdr
)) {
833 int want
= sizeof(rpc_fraghdr
) - svsk
->sk_tcplen
;
836 iov
.iov_base
= ((char *) &svsk
->sk_reclen
) + svsk
->sk_tcplen
;
838 if ((len
= svc_recvfrom(rqstp
, &iov
, 1, want
)) < 0)
840 svsk
->sk_tcplen
+= len
;
843 dprintk("svc: short recvfrom while reading record "
844 "length (%d of %d)\n", len
, want
);
845 svc_xprt_received(&svsk
->sk_xprt
);
846 return -EAGAIN
; /* record header not complete */
849 svsk
->sk_reclen
= ntohl(svsk
->sk_reclen
);
850 if (!(svsk
->sk_reclen
& RPC_LAST_STREAM_FRAGMENT
)) {
851 /* FIXME: technically, a record can be fragmented,
852 * and non-terminal fragments will not have the top
853 * bit set in the fragment length header.
854 * But apparently no known nfs clients send fragmented
857 printk(KERN_NOTICE
"RPC: multiple fragments "
858 "per record not supported\n");
861 svsk
->sk_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
862 dprintk("svc: TCP record, %d bytes\n", svsk
->sk_reclen
);
863 if (svsk
->sk_reclen
> serv
->sv_max_mesg
) {
865 printk(KERN_NOTICE
"RPC: "
866 "fragment too large: 0x%08lx\n",
867 (unsigned long)svsk
->sk_reclen
);
872 /* Check whether enough data is available */
873 len
= svc_recv_available(svsk
);
877 if (len
< svsk
->sk_reclen
) {
878 dprintk("svc: incomplete TCP record (%d of %d)\n",
879 len
, svsk
->sk_reclen
);
880 svc_xprt_received(&svsk
->sk_xprt
);
881 return -EAGAIN
; /* record not complete */
883 len
= svsk
->sk_reclen
;
884 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
887 vec
[0] = rqstp
->rq_arg
.head
[0];
891 vec
[pnum
].iov_base
= page_address(rqstp
->rq_pages
[pnum
]);
892 vec
[pnum
].iov_len
= PAGE_SIZE
;
896 rqstp
->rq_respages
= &rqstp
->rq_pages
[pnum
];
898 /* Now receive data */
899 len
= svc_recvfrom(rqstp
, vec
, pnum
, len
);
903 dprintk("svc: TCP complete record (%d bytes)\n", len
);
904 rqstp
->rq_arg
.len
= len
;
905 rqstp
->rq_arg
.page_base
= 0;
906 if (len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
907 rqstp
->rq_arg
.head
[0].iov_len
= len
;
908 rqstp
->rq_arg
.page_len
= 0;
910 rqstp
->rq_arg
.page_len
= len
- rqstp
->rq_arg
.head
[0].iov_len
;
913 rqstp
->rq_xprt_ctxt
= NULL
;
914 rqstp
->rq_prot
= IPPROTO_TCP
;
916 /* Reset TCP read info */
920 svc_xprt_copy_addrs(rqstp
, &svsk
->sk_xprt
);
921 svc_xprt_received(&svsk
->sk_xprt
);
923 serv
->sv_stats
->nettcpcnt
++;
928 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
932 if (len
== -EAGAIN
) {
933 dprintk("RPC: TCP recvfrom got EAGAIN\n");
934 svc_xprt_received(&svsk
->sk_xprt
);
936 printk(KERN_NOTICE
"%s: recvfrom returned errno %d\n",
937 svsk
->sk_xprt
.xpt_server
->sv_name
, -len
);
945 * Send out data on TCP socket.
947 static int svc_tcp_sendto(struct svc_rqst
*rqstp
)
949 struct xdr_buf
*xbufp
= &rqstp
->rq_res
;
953 /* Set up the first element of the reply kvec.
954 * Any other kvecs that may be in use have been taken
955 * care of by the server implementation itself.
957 reclen
= htonl(0x80000000|((xbufp
->len
) - 4));
958 memcpy(xbufp
->head
[0].iov_base
, &reclen
, 4);
960 if (test_bit(XPT_DEAD
, &rqstp
->rq_xprt
->xpt_flags
))
963 sent
= svc_sendto(rqstp
, &rqstp
->rq_res
);
964 if (sent
!= xbufp
->len
) {
966 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
967 "- shutting down socket\n",
968 rqstp
->rq_xprt
->xpt_server
->sv_name
,
969 (sent
<0)?"got error":"sent only",
971 set_bit(XPT_CLOSE
, &rqstp
->rq_xprt
->xpt_flags
);
972 svc_xprt_enqueue(rqstp
->rq_xprt
);
979 * Setup response header. TCP has a 4B record length field.
981 static void svc_tcp_prep_reply_hdr(struct svc_rqst
*rqstp
)
983 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
985 /* tcp needs a space for the record length... */
989 static int svc_tcp_has_wspace(struct svc_xprt
*xprt
)
991 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
992 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
997 * Set the SOCK_NOSPACE flag before checking the available
1000 set_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
1001 required
= atomic_read(&svsk
->sk_xprt
.xpt_reserved
) + serv
->sv_max_mesg
;
1002 wspace
= sk_stream_wspace(svsk
->sk_sk
);
1004 if (wspace
< sk_stream_min_wspace(svsk
->sk_sk
))
1006 if (required
* 2 > wspace
)
1009 clear_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
1013 static struct svc_xprt
*svc_tcp_create(struct svc_serv
*serv
,
1014 struct sockaddr
*sa
, int salen
,
1017 return svc_create_socket(serv
, IPPROTO_TCP
, sa
, salen
, flags
);
1020 static struct svc_xprt_ops svc_tcp_ops
= {
1021 .xpo_create
= svc_tcp_create
,
1022 .xpo_recvfrom
= svc_tcp_recvfrom
,
1023 .xpo_sendto
= svc_tcp_sendto
,
1024 .xpo_release_rqst
= svc_release_skb
,
1025 .xpo_detach
= svc_tcp_sock_detach
,
1026 .xpo_free
= svc_sock_free
,
1027 .xpo_prep_reply_hdr
= svc_tcp_prep_reply_hdr
,
1028 .xpo_has_wspace
= svc_tcp_has_wspace
,
1029 .xpo_accept
= svc_tcp_accept
,
1032 static struct svc_xprt_class svc_tcp_class
= {
1034 .xcl_owner
= THIS_MODULE
,
1035 .xcl_ops
= &svc_tcp_ops
,
1036 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_TCP
,
1039 void svc_init_xprt_sock(void)
1041 svc_reg_xprt_class(&svc_tcp_class
);
1042 svc_reg_xprt_class(&svc_udp_class
);
1045 void svc_cleanup_xprt_sock(void)
1047 svc_unreg_xprt_class(&svc_tcp_class
);
1048 svc_unreg_xprt_class(&svc_udp_class
);
1051 static void svc_tcp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
1053 struct sock
*sk
= svsk
->sk_sk
;
1055 svc_xprt_init(&svc_tcp_class
, &svsk
->sk_xprt
, serv
);
1056 set_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
1057 if (sk
->sk_state
== TCP_LISTEN
) {
1058 dprintk("setting up TCP socket for listening\n");
1059 set_bit(XPT_LISTENER
, &svsk
->sk_xprt
.xpt_flags
);
1060 sk
->sk_data_ready
= svc_tcp_listen_data_ready
;
1061 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
1063 dprintk("setting up TCP socket for reading\n");
1064 sk
->sk_state_change
= svc_tcp_state_change
;
1065 sk
->sk_data_ready
= svc_tcp_data_ready
;
1066 sk
->sk_write_space
= svc_write_space
;
1068 svsk
->sk_reclen
= 0;
1069 svsk
->sk_tcplen
= 0;
1071 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1073 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1074 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1075 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1079 void svc_sock_update_bufs(struct svc_serv
*serv
)
1082 * The number of server threads has changed. Update
1083 * rcvbuf and sndbuf accordingly on all sockets
1085 struct list_head
*le
;
1087 spin_lock_bh(&serv
->sv_lock
);
1088 list_for_each(le
, &serv
->sv_permsocks
) {
1089 struct svc_sock
*svsk
=
1090 list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1091 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1093 list_for_each(le
, &serv
->sv_tempsocks
) {
1094 struct svc_sock
*svsk
=
1095 list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1096 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1098 spin_unlock_bh(&serv
->sv_lock
);
1100 EXPORT_SYMBOL_GPL(svc_sock_update_bufs
);
1103 * Initialize socket for RPC use and create svc_sock struct
1104 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1106 static struct svc_sock
*svc_setup_socket(struct svc_serv
*serv
,
1107 struct socket
*sock
,
1108 int *errp
, int flags
)
1110 struct svc_sock
*svsk
;
1112 int pmap_register
= !(flags
& SVC_SOCK_ANONYMOUS
);
1114 dprintk("svc: svc_setup_socket %p\n", sock
);
1115 if (!(svsk
= kzalloc(sizeof(*svsk
), GFP_KERNEL
))) {
1122 /* Register socket with portmapper */
1123 if (*errp
>= 0 && pmap_register
)
1124 *errp
= svc_register(serv
, inet
->sk_family
, inet
->sk_protocol
,
1125 ntohs(inet_sk(inet
)->sport
));
1132 inet
->sk_user_data
= svsk
;
1133 svsk
->sk_sock
= sock
;
1135 svsk
->sk_ostate
= inet
->sk_state_change
;
1136 svsk
->sk_odata
= inet
->sk_data_ready
;
1137 svsk
->sk_owspace
= inet
->sk_write_space
;
1139 /* Initialize the socket */
1140 if (sock
->type
== SOCK_DGRAM
)
1141 svc_udp_init(svsk
, serv
);
1143 /* initialise setting must have enough space to
1144 * receive and respond to one request.
1146 svc_sock_setbufsize(svsk
->sk_sock
, 4 * serv
->sv_max_mesg
,
1147 4 * serv
->sv_max_mesg
);
1148 svc_tcp_init(svsk
, serv
);
1151 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1158 * svc_addsock - add a listener socket to an RPC service
1159 * @serv: pointer to RPC service to which to add a new listener
1160 * @fd: file descriptor of the new listener
1161 * @name_return: pointer to buffer to fill in with name of listener
1162 * @len: size of the buffer
1164 * Fills in socket name and returns positive length of name if successful.
1165 * Name is terminated with '\n'. On error, returns a negative errno
1168 int svc_addsock(struct svc_serv
*serv
, const int fd
, char *name_return
,
1172 struct socket
*so
= sockfd_lookup(fd
, &err
);
1173 struct svc_sock
*svsk
= NULL
;
1177 if (so
->sk
->sk_family
!= AF_INET
)
1178 err
= -EAFNOSUPPORT
;
1179 else if (so
->sk
->sk_protocol
!= IPPROTO_TCP
&&
1180 so
->sk
->sk_protocol
!= IPPROTO_UDP
)
1181 err
= -EPROTONOSUPPORT
;
1182 else if (so
->state
> SS_UNCONNECTED
)
1185 if (!try_module_get(THIS_MODULE
))
1188 svsk
= svc_setup_socket(serv
, so
, &err
,
1191 struct sockaddr_storage addr
;
1192 struct sockaddr
*sin
= (struct sockaddr
*)&addr
;
1194 if (kernel_getsockname(svsk
->sk_sock
, sin
, &salen
) == 0)
1195 svc_xprt_set_local(&svsk
->sk_xprt
, sin
, salen
);
1196 clear_bit(XPT_TEMP
, &svsk
->sk_xprt
.xpt_flags
);
1197 spin_lock_bh(&serv
->sv_lock
);
1198 list_add(&svsk
->sk_xprt
.xpt_list
, &serv
->sv_permsocks
);
1199 spin_unlock_bh(&serv
->sv_lock
);
1200 svc_xprt_received(&svsk
->sk_xprt
);
1203 module_put(THIS_MODULE
);
1209 return svc_one_sock_name(svsk
, name_return
, len
);
1211 EXPORT_SYMBOL_GPL(svc_addsock
);
1214 * Create socket for RPC service.
1216 static struct svc_xprt
*svc_create_socket(struct svc_serv
*serv
,
1218 struct sockaddr
*sin
, int len
,
1221 struct svc_sock
*svsk
;
1222 struct socket
*sock
;
1225 struct sockaddr_storage addr
;
1226 struct sockaddr
*newsin
= (struct sockaddr
*)&addr
;
1230 RPC_IFDEBUG(char buf
[RPC_MAX_ADDRBUFLEN
]);
1232 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1233 serv
->sv_program
->pg_name
, protocol
,
1234 __svc_print_addr(sin
, buf
, sizeof(buf
)));
1236 if (protocol
!= IPPROTO_UDP
&& protocol
!= IPPROTO_TCP
) {
1237 printk(KERN_WARNING
"svc: only UDP and TCP "
1238 "sockets supported\n");
1239 return ERR_PTR(-EINVAL
);
1242 type
= (protocol
== IPPROTO_UDP
)? SOCK_DGRAM
: SOCK_STREAM
;
1243 switch (sin
->sa_family
) {
1251 return ERR_PTR(-EINVAL
);
1254 error
= sock_create_kern(family
, type
, protocol
, &sock
);
1256 return ERR_PTR(error
);
1258 svc_reclassify_socket(sock
);
1261 * If this is an PF_INET6 listener, we want to avoid
1262 * getting requests from IPv4 remotes. Those should
1263 * be shunted to a PF_INET listener via rpcbind.
1266 if (family
== PF_INET6
)
1267 kernel_setsockopt(sock
, SOL_IPV6
, IPV6_V6ONLY
,
1268 (char *)&val
, sizeof(val
));
1270 if (type
== SOCK_STREAM
)
1271 sock
->sk
->sk_reuse
= 1; /* allow address reuse */
1272 error
= kernel_bind(sock
, sin
, len
);
1277 error
= kernel_getsockname(sock
, newsin
, &newlen
);
1281 if (protocol
== IPPROTO_TCP
) {
1282 if ((error
= kernel_listen(sock
, 64)) < 0)
1286 if ((svsk
= svc_setup_socket(serv
, sock
, &error
, flags
)) != NULL
) {
1287 svc_xprt_set_local(&svsk
->sk_xprt
, newsin
, newlen
);
1288 return (struct svc_xprt
*)svsk
;
1292 dprintk("svc: svc_create_socket error = %d\n", -error
);
1294 return ERR_PTR(error
);
1298 * Detach the svc_sock from the socket so that no
1299 * more callbacks occur.
1301 static void svc_sock_detach(struct svc_xprt
*xprt
)
1303 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1304 struct sock
*sk
= svsk
->sk_sk
;
1306 dprintk("svc: svc_sock_detach(%p)\n", svsk
);
1308 /* put back the old socket callbacks */
1309 sk
->sk_state_change
= svsk
->sk_ostate
;
1310 sk
->sk_data_ready
= svsk
->sk_odata
;
1311 sk
->sk_write_space
= svsk
->sk_owspace
;
1313 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1314 wake_up_interruptible(sk
->sk_sleep
);
1318 * Disconnect the socket, and reset the callbacks
1320 static void svc_tcp_sock_detach(struct svc_xprt
*xprt
)
1322 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1324 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk
);
1326 svc_sock_detach(xprt
);
1328 if (!test_bit(XPT_LISTENER
, &xprt
->xpt_flags
))
1329 kernel_sock_shutdown(svsk
->sk_sock
, SHUT_RDWR
);
1333 * Free the svc_sock's socket resources and the svc_sock itself.
1335 static void svc_sock_free(struct svc_xprt
*xprt
)
1337 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1338 dprintk("svc: svc_sock_free(%p)\n", svsk
);
1340 if (svsk
->sk_sock
->file
)
1341 sockfd_put(svsk
->sk_sock
);
1343 sock_release(svsk
->sk_sock
);