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>
41 #include <net/tcp_states.h>
42 #include <asm/uaccess.h>
43 #include <asm/ioctls.h>
45 #include <linux/sunrpc/types.h>
46 #include <linux/sunrpc/clnt.h>
47 #include <linux/sunrpc/xdr.h>
48 #include <linux/sunrpc/svcsock.h>
49 #include <linux/sunrpc/stats.h>
51 /* SMP locking strategy:
53 * svc_pool->sp_lock protects most of the fields of that pool.
54 * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt.
55 * when both need to be taken (rare), svc_serv->sv_lock is first.
56 * BKL protects svc_serv->sv_nrthread.
57 * svc_sock->sk_lock protects the svc_sock->sk_deferred list
58 * and the ->sk_info_authunix cache.
59 * svc_sock->sk_xprt.xpt_flags.XPT_BUSY prevents a svc_sock being
62 * Some flags can be set to certain values at any time
63 * providing that certain rules are followed:
65 * XPT_CONN, XPT_DATA, can be set or cleared at any time.
66 * after a set, svc_xprt_enqueue must be called.
67 * after a clear, the socket must be read/accepted
68 * if this succeeds, it must be set again.
69 * XPT_CLOSE can set at any time. It is never cleared.
70 * xpt_ref contains a bias of '1' until XPT_DEAD is set.
71 * so when xprt_ref hits zero, we know the transport is dead
72 * and no-one is using it.
73 * XPT_DEAD can only be set while XPT_BUSY is held which ensures
74 * no other thread will be using the socket or will try to
79 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
82 static struct svc_sock
*svc_setup_socket(struct svc_serv
*, struct socket
*,
83 int *errp
, int flags
);
84 static void svc_delete_xprt(struct svc_xprt
*xprt
);
85 static void svc_udp_data_ready(struct sock
*, int);
86 static int svc_udp_recvfrom(struct svc_rqst
*);
87 static int svc_udp_sendto(struct svc_rqst
*);
88 static void svc_close_xprt(struct svc_xprt
*xprt
);
89 static void svc_sock_detach(struct svc_xprt
*);
90 static void svc_sock_free(struct svc_xprt
*);
92 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
);
93 static int svc_deferred_recv(struct svc_rqst
*rqstp
);
94 static struct cache_deferred_req
*svc_defer(struct cache_req
*req
);
95 static struct svc_xprt
*svc_create_socket(struct svc_serv
*, int,
96 struct sockaddr
*, int, int);
98 /* apparently the "standard" is that clients close
99 * idle connections after 5 minutes, servers after
101 * http://www.connectathon.org/talks96/nfstcp.pdf
103 static int svc_conn_age_period
= 6*60;
105 #ifdef CONFIG_DEBUG_LOCK_ALLOC
106 static struct lock_class_key svc_key
[2];
107 static struct lock_class_key svc_slock_key
[2];
109 static inline void svc_reclassify_socket(struct socket
*sock
)
111 struct sock
*sk
= sock
->sk
;
112 BUG_ON(sock_owned_by_user(sk
));
113 switch (sk
->sk_family
) {
115 sock_lock_init_class_and_name(sk
, "slock-AF_INET-NFSD",
117 "sk_xprt.xpt_lock-AF_INET-NFSD",
122 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-NFSD",
124 "sk_xprt.xpt_lock-AF_INET6-NFSD",
133 static inline void svc_reclassify_socket(struct socket
*sock
)
138 static char *__svc_print_addr(struct sockaddr
*addr
, char *buf
, size_t len
)
140 switch (addr
->sa_family
) {
142 snprintf(buf
, len
, "%u.%u.%u.%u, port=%u",
143 NIPQUAD(((struct sockaddr_in
*) addr
)->sin_addr
),
144 ntohs(((struct sockaddr_in
*) addr
)->sin_port
));
148 snprintf(buf
, len
, "%x:%x:%x:%x:%x:%x:%x:%x, port=%u",
149 NIP6(((struct sockaddr_in6
*) addr
)->sin6_addr
),
150 ntohs(((struct sockaddr_in6
*) addr
)->sin6_port
));
154 snprintf(buf
, len
, "unknown address type: %d", addr
->sa_family
);
161 * svc_print_addr - Format rq_addr field for printing
162 * @rqstp: svc_rqst struct containing address to print
163 * @buf: target buffer for formatted address
164 * @len: length of target buffer
167 char *svc_print_addr(struct svc_rqst
*rqstp
, char *buf
, size_t len
)
169 return __svc_print_addr(svc_addr(rqstp
), buf
, len
);
171 EXPORT_SYMBOL_GPL(svc_print_addr
);
174 * Queue up an idle server thread. Must have pool->sp_lock held.
175 * Note: this is really a stack rather than a queue, so that we only
176 * use as many different threads as we need, and the rest don't pollute
180 svc_thread_enqueue(struct svc_pool
*pool
, struct svc_rqst
*rqstp
)
182 list_add(&rqstp
->rq_list
, &pool
->sp_threads
);
186 * Dequeue an nfsd thread. Must have pool->sp_lock held.
189 svc_thread_dequeue(struct svc_pool
*pool
, struct svc_rqst
*rqstp
)
191 list_del(&rqstp
->rq_list
);
195 * Release an skbuff after use
197 static void svc_release_skb(struct svc_rqst
*rqstp
)
199 struct sk_buff
*skb
= rqstp
->rq_xprt_ctxt
;
200 struct svc_deferred_req
*dr
= rqstp
->rq_deferred
;
203 rqstp
->rq_xprt_ctxt
= NULL
;
205 dprintk("svc: service %p, releasing skb %p\n", rqstp
, skb
);
206 skb_free_datagram(rqstp
->rq_sock
->sk_sk
, skb
);
209 rqstp
->rq_deferred
= NULL
;
215 * Queue up a socket with data pending. If there are idle nfsd
216 * processes, wake 'em up.
219 void svc_xprt_enqueue(struct svc_xprt
*xprt
)
221 struct svc_serv
*serv
= xprt
->xpt_server
;
222 struct svc_pool
*pool
;
223 struct svc_rqst
*rqstp
;
226 if (!(xprt
->xpt_flags
&
227 ((1<<XPT_CONN
)|(1<<XPT_DATA
)|(1<<XPT_CLOSE
)|(1<<XPT_DEFERRED
))))
229 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
233 pool
= svc_pool_for_cpu(xprt
->xpt_server
, cpu
);
236 spin_lock_bh(&pool
->sp_lock
);
238 if (!list_empty(&pool
->sp_threads
) &&
239 !list_empty(&pool
->sp_sockets
))
242 "threads and transports both waiting??\n");
244 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
)) {
245 /* Don't enqueue dead sockets */
246 dprintk("svc: transport %p is dead, not enqueued\n", xprt
);
250 /* Mark socket as busy. It will remain in this state until the
251 * server has processed all pending data and put the socket back
252 * on the idle list. We update XPT_BUSY atomically because
253 * it also guards against trying to enqueue the svc_sock twice.
255 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
)) {
256 /* Don't enqueue socket while already enqueued */
257 dprintk("svc: transport %p busy, not enqueued\n", xprt
);
260 BUG_ON(xprt
->xpt_pool
!= NULL
);
261 xprt
->xpt_pool
= pool
;
263 /* Handle pending connection */
264 if (test_bit(XPT_CONN
, &xprt
->xpt_flags
))
267 /* Handle close in-progress */
268 if (test_bit(XPT_CLOSE
, &xprt
->xpt_flags
))
271 /* Check if we have space to reply to a request */
272 if (!xprt
->xpt_ops
->xpo_has_wspace(xprt
)) {
273 /* Don't enqueue while not enough space for reply */
274 dprintk("svc: no write space, transport %p not enqueued\n",
276 xprt
->xpt_pool
= NULL
;
277 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
282 if (!list_empty(&pool
->sp_threads
)) {
283 rqstp
= list_entry(pool
->sp_threads
.next
,
286 dprintk("svc: transport %p served by daemon %p\n",
288 svc_thread_dequeue(pool
, rqstp
);
291 "svc_xprt_enqueue: server %p, rq_xprt=%p!\n",
292 rqstp
, rqstp
->rq_xprt
);
293 rqstp
->rq_xprt
= xprt
;
295 rqstp
->rq_reserved
= serv
->sv_max_mesg
;
296 atomic_add(rqstp
->rq_reserved
, &xprt
->xpt_reserved
);
297 BUG_ON(xprt
->xpt_pool
!= pool
);
298 wake_up(&rqstp
->rq_wait
);
300 dprintk("svc: transport %p put into queue\n", xprt
);
301 list_add_tail(&xprt
->xpt_ready
, &pool
->sp_sockets
);
302 BUG_ON(xprt
->xpt_pool
!= pool
);
306 spin_unlock_bh(&pool
->sp_lock
);
308 EXPORT_SYMBOL_GPL(svc_xprt_enqueue
);
311 * Dequeue the first socket. Must be called with the pool->sp_lock held.
313 static inline struct svc_sock
*
314 svc_sock_dequeue(struct svc_pool
*pool
)
316 struct svc_sock
*svsk
;
318 if (list_empty(&pool
->sp_sockets
))
321 svsk
= list_entry(pool
->sp_sockets
.next
,
322 struct svc_sock
, sk_xprt
.xpt_ready
);
323 list_del_init(&svsk
->sk_xprt
.xpt_ready
);
325 dprintk("svc: socket %p dequeued, inuse=%d\n",
326 svsk
->sk_sk
, atomic_read(&svsk
->sk_xprt
.xpt_ref
.refcount
));
332 * svc_xprt_received conditionally queues the transport for processing
333 * by another thread. The caller must hold the XPT_BUSY bit and must
334 * not thereafter touch transport data.
336 * Note: XPT_DATA only gets cleared when a read-attempt finds no (or
337 * insufficient) data.
339 void svc_xprt_received(struct svc_xprt
*xprt
)
341 BUG_ON(!test_bit(XPT_BUSY
, &xprt
->xpt_flags
));
342 xprt
->xpt_pool
= NULL
;
343 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
344 svc_xprt_enqueue(xprt
);
346 EXPORT_SYMBOL_GPL(svc_xprt_received
);
349 * svc_reserve - change the space reserved for the reply to a request.
350 * @rqstp: The request in question
351 * @space: new max space to reserve
353 * Each request reserves some space on the output queue of the socket
354 * to make sure the reply fits. This function reduces that reserved
355 * space to be the amount of space used already, plus @space.
358 void svc_reserve(struct svc_rqst
*rqstp
, int space
)
360 space
+= rqstp
->rq_res
.head
[0].iov_len
;
362 if (space
< rqstp
->rq_reserved
) {
363 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
364 atomic_sub((rqstp
->rq_reserved
- space
), &xprt
->xpt_reserved
);
365 rqstp
->rq_reserved
= space
;
367 svc_xprt_enqueue(xprt
);
372 svc_sock_release(struct svc_rqst
*rqstp
)
374 struct svc_sock
*svsk
= rqstp
->rq_sock
;
376 rqstp
->rq_xprt
->xpt_ops
->xpo_release_rqst(rqstp
);
378 svc_free_res_pages(rqstp
);
379 rqstp
->rq_res
.page_len
= 0;
380 rqstp
->rq_res
.page_base
= 0;
383 /* Reset response buffer and release
385 * But first, check that enough space was reserved
386 * for the reply, otherwise we have a bug!
388 if ((rqstp
->rq_res
.len
) > rqstp
->rq_reserved
)
389 printk(KERN_ERR
"RPC request reserved %d but used %d\n",
393 rqstp
->rq_res
.head
[0].iov_len
= 0;
394 svc_reserve(rqstp
, 0);
395 rqstp
->rq_sock
= NULL
;
397 svc_xprt_put(&svsk
->sk_xprt
);
401 * External function to wake up a server waiting for data
402 * This really only makes sense for services like lockd
403 * which have exactly one thread anyway.
406 svc_wake_up(struct svc_serv
*serv
)
408 struct svc_rqst
*rqstp
;
410 struct svc_pool
*pool
;
412 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
413 pool
= &serv
->sv_pools
[i
];
415 spin_lock_bh(&pool
->sp_lock
);
416 if (!list_empty(&pool
->sp_threads
)) {
417 rqstp
= list_entry(pool
->sp_threads
.next
,
420 dprintk("svc: daemon %p woken up.\n", rqstp
);
422 svc_thread_dequeue(pool, rqstp);
423 rqstp->rq_sock = NULL;
425 wake_up(&rqstp
->rq_wait
);
427 spin_unlock_bh(&pool
->sp_lock
);
431 union svc_pktinfo_u
{
432 struct in_pktinfo pkti
;
433 struct in6_pktinfo pkti6
;
435 #define SVC_PKTINFO_SPACE \
436 CMSG_SPACE(sizeof(union svc_pktinfo_u))
438 static void svc_set_cmsg_data(struct svc_rqst
*rqstp
, struct cmsghdr
*cmh
)
440 switch (rqstp
->rq_sock
->sk_sk
->sk_family
) {
442 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
444 cmh
->cmsg_level
= SOL_IP
;
445 cmh
->cmsg_type
= IP_PKTINFO
;
446 pki
->ipi_ifindex
= 0;
447 pki
->ipi_spec_dst
.s_addr
= rqstp
->rq_daddr
.addr
.s_addr
;
448 cmh
->cmsg_len
= CMSG_LEN(sizeof(*pki
));
453 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
455 cmh
->cmsg_level
= SOL_IPV6
;
456 cmh
->cmsg_type
= IPV6_PKTINFO
;
457 pki
->ipi6_ifindex
= 0;
458 ipv6_addr_copy(&pki
->ipi6_addr
,
459 &rqstp
->rq_daddr
.addr6
);
460 cmh
->cmsg_len
= CMSG_LEN(sizeof(*pki
));
468 * Generic sendto routine
471 svc_sendto(struct svc_rqst
*rqstp
, struct xdr_buf
*xdr
)
473 struct svc_sock
*svsk
= rqstp
->rq_sock
;
474 struct socket
*sock
= svsk
->sk_sock
;
478 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
480 struct cmsghdr
*cmh
= &buffer
.hdr
;
484 struct page
**ppage
= xdr
->pages
;
485 size_t base
= xdr
->page_base
;
486 unsigned int pglen
= xdr
->page_len
;
487 unsigned int flags
= MSG_MORE
;
488 char buf
[RPC_MAX_ADDRBUFLEN
];
492 if (rqstp
->rq_prot
== IPPROTO_UDP
) {
493 struct msghdr msg
= {
494 .msg_name
= &rqstp
->rq_addr
,
495 .msg_namelen
= rqstp
->rq_addrlen
,
497 .msg_controllen
= sizeof(buffer
),
498 .msg_flags
= MSG_MORE
,
501 svc_set_cmsg_data(rqstp
, cmh
);
503 if (sock_sendmsg(sock
, &msg
, 0) < 0)
508 if (slen
== xdr
->head
[0].iov_len
)
510 len
= kernel_sendpage(sock
, rqstp
->rq_respages
[0], 0,
511 xdr
->head
[0].iov_len
, flags
);
512 if (len
!= xdr
->head
[0].iov_len
)
514 slen
-= xdr
->head
[0].iov_len
;
519 size
= PAGE_SIZE
- base
< pglen
? PAGE_SIZE
- base
: pglen
;
523 result
= kernel_sendpage(sock
, *ppage
, base
, size
, flags
);
530 size
= PAGE_SIZE
< pglen
? PAGE_SIZE
: pglen
;
535 if (xdr
->tail
[0].iov_len
) {
536 result
= kernel_sendpage(sock
, rqstp
->rq_respages
[0],
537 ((unsigned long)xdr
->tail
[0].iov_base
)
539 xdr
->tail
[0].iov_len
, 0);
545 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
546 rqstp
->rq_sock
, xdr
->head
[0].iov_base
, xdr
->head
[0].iov_len
,
547 xdr
->len
, len
, svc_print_addr(rqstp
, buf
, sizeof(buf
)));
553 * Report socket names for nfsdfs
555 static int one_sock_name(char *buf
, struct svc_sock
*svsk
)
559 switch(svsk
->sk_sk
->sk_family
) {
561 len
= sprintf(buf
, "ipv4 %s %u.%u.%u.%u %d\n",
562 svsk
->sk_sk
->sk_protocol
==IPPROTO_UDP
?
564 NIPQUAD(inet_sk(svsk
->sk_sk
)->rcv_saddr
),
565 inet_sk(svsk
->sk_sk
)->num
);
568 len
= sprintf(buf
, "*unknown-%d*\n",
569 svsk
->sk_sk
->sk_family
);
575 svc_sock_names(char *buf
, struct svc_serv
*serv
, char *toclose
)
577 struct svc_sock
*svsk
, *closesk
= NULL
;
582 spin_lock_bh(&serv
->sv_lock
);
583 list_for_each_entry(svsk
, &serv
->sv_permsocks
, sk_xprt
.xpt_list
) {
584 int onelen
= one_sock_name(buf
+len
, svsk
);
585 if (toclose
&& strcmp(toclose
, buf
+len
) == 0)
590 spin_unlock_bh(&serv
->sv_lock
);
592 /* Should unregister with portmap, but you cannot
593 * unregister just one protocol...
595 svc_close_xprt(&closesk
->sk_xprt
);
600 EXPORT_SYMBOL(svc_sock_names
);
603 * Check input queue length
606 svc_recv_available(struct svc_sock
*svsk
)
608 struct socket
*sock
= svsk
->sk_sock
;
611 err
= kernel_sock_ioctl(sock
, TIOCINQ
, (unsigned long) &avail
);
613 return (err
>= 0)? avail
: err
;
617 * Generic recvfrom routine.
620 svc_recvfrom(struct svc_rqst
*rqstp
, struct kvec
*iov
, int nr
, int buflen
)
622 struct svc_sock
*svsk
= rqstp
->rq_sock
;
623 struct msghdr msg
= {
624 .msg_flags
= MSG_DONTWAIT
,
628 len
= kernel_recvmsg(svsk
->sk_sock
, &msg
, iov
, nr
, buflen
,
631 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
632 svsk
, iov
[0].iov_base
, iov
[0].iov_len
, len
);
637 * Set socket snd and rcv buffer lengths
640 svc_sock_setbufsize(struct socket
*sock
, unsigned int snd
, unsigned int rcv
)
644 oldfs
= get_fs(); set_fs(KERNEL_DS
);
645 sock_setsockopt(sock
, SOL_SOCKET
, SO_SNDBUF
,
646 (char*)&snd
, sizeof(snd
));
647 sock_setsockopt(sock
, SOL_SOCKET
, SO_RCVBUF
,
648 (char*)&rcv
, sizeof(rcv
));
650 /* sock_setsockopt limits use to sysctl_?mem_max,
651 * which isn't acceptable. Until that is made conditional
652 * on not having CAP_SYS_RESOURCE or similar, we go direct...
653 * DaveM said I could!
656 sock
->sk
->sk_sndbuf
= snd
* 2;
657 sock
->sk
->sk_rcvbuf
= rcv
* 2;
658 sock
->sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
|SOCK_RCVBUF_LOCK
;
659 release_sock(sock
->sk
);
663 * INET callback when data has been received on the socket.
666 svc_udp_data_ready(struct sock
*sk
, int count
)
668 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
671 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
673 test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
));
674 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
675 svc_xprt_enqueue(&svsk
->sk_xprt
);
677 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
678 wake_up_interruptible(sk
->sk_sleep
);
682 * INET callback when space is newly available on the socket.
685 svc_write_space(struct sock
*sk
)
687 struct svc_sock
*svsk
= (struct svc_sock
*)(sk
->sk_user_data
);
690 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
691 svsk
, sk
, test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
));
692 svc_xprt_enqueue(&svsk
->sk_xprt
);
695 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
)) {
696 dprintk("RPC svc_write_space: someone sleeping on %p\n",
698 wake_up_interruptible(sk
->sk_sleep
);
703 * Copy the UDP datagram's destination address to the rqstp structure.
704 * The 'destination' address in this case is the address to which the
705 * peer sent the datagram, i.e. our local address. For multihomed
706 * hosts, this can change from msg to msg. Note that only the IP
707 * address changes, the port number should remain the same.
709 static void svc_udp_get_dest_address(struct svc_rqst
*rqstp
,
712 switch (rqstp
->rq_sock
->sk_sk
->sk_family
) {
714 struct in_pktinfo
*pki
= CMSG_DATA(cmh
);
715 rqstp
->rq_daddr
.addr
.s_addr
= pki
->ipi_spec_dst
.s_addr
;
719 struct in6_pktinfo
*pki
= CMSG_DATA(cmh
);
720 ipv6_addr_copy(&rqstp
->rq_daddr
.addr6
, &pki
->ipi6_addr
);
727 * Receive a datagram from a UDP socket.
730 svc_udp_recvfrom(struct svc_rqst
*rqstp
)
732 struct svc_sock
*svsk
= rqstp
->rq_sock
;
733 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
737 long all
[SVC_PKTINFO_SPACE
/ sizeof(long)];
739 struct cmsghdr
*cmh
= &buffer
.hdr
;
741 struct msghdr msg
= {
742 .msg_name
= svc_addr(rqstp
),
744 .msg_controllen
= sizeof(buffer
),
745 .msg_flags
= MSG_DONTWAIT
,
748 if (test_and_clear_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
))
749 /* udp sockets need large rcvbuf as all pending
750 * requests are still in that buffer. sndbuf must
751 * also be large enough that there is enough space
752 * for one reply per thread. We count all threads
753 * rather than threads in a particular pool, which
754 * provides an upper bound on the number of threads
755 * which will access the socket.
757 svc_sock_setbufsize(svsk
->sk_sock
,
758 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
,
759 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
);
761 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
763 err
= kernel_recvmsg(svsk
->sk_sock
, &msg
, NULL
,
764 0, 0, MSG_PEEK
| MSG_DONTWAIT
);
766 skb
= skb_recv_datagram(svsk
->sk_sk
, 0, 1, &err
);
769 if (err
!= -EAGAIN
) {
770 /* possibly an icmp error */
771 dprintk("svc: recvfrom returned error %d\n", -err
);
772 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
774 svc_xprt_received(&svsk
->sk_xprt
);
777 len
= svc_addr_len(svc_addr(rqstp
));
780 rqstp
->rq_addrlen
= len
;
781 if (skb
->tstamp
.tv64
== 0) {
782 skb
->tstamp
= ktime_get_real();
783 /* Don't enable netstamp, sunrpc doesn't
784 need that much accuracy */
786 svsk
->sk_sk
->sk_stamp
= skb
->tstamp
;
787 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
); /* there may be more data... */
790 * Maybe more packets - kick another thread ASAP.
792 svc_xprt_received(&svsk
->sk_xprt
);
794 len
= skb
->len
- sizeof(struct udphdr
);
795 rqstp
->rq_arg
.len
= len
;
797 rqstp
->rq_prot
= IPPROTO_UDP
;
799 if (cmh
->cmsg_level
!= IPPROTO_IP
||
800 cmh
->cmsg_type
!= IP_PKTINFO
) {
802 printk("rpcsvc: received unknown control message:"
804 cmh
->cmsg_level
, cmh
->cmsg_type
);
805 skb_free_datagram(svsk
->sk_sk
, skb
);
808 svc_udp_get_dest_address(rqstp
, cmh
);
810 if (skb_is_nonlinear(skb
)) {
811 /* we have to copy */
813 if (csum_partial_copy_to_xdr(&rqstp
->rq_arg
, skb
)) {
816 skb_free_datagram(svsk
->sk_sk
, skb
);
820 skb_free_datagram(svsk
->sk_sk
, skb
);
822 /* we can use it in-place */
823 rqstp
->rq_arg
.head
[0].iov_base
= skb
->data
+ sizeof(struct udphdr
);
824 rqstp
->rq_arg
.head
[0].iov_len
= len
;
825 if (skb_checksum_complete(skb
)) {
826 skb_free_datagram(svsk
->sk_sk
, skb
);
829 rqstp
->rq_xprt_ctxt
= skb
;
832 rqstp
->rq_arg
.page_base
= 0;
833 if (len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
834 rqstp
->rq_arg
.head
[0].iov_len
= len
;
835 rqstp
->rq_arg
.page_len
= 0;
836 rqstp
->rq_respages
= rqstp
->rq_pages
+1;
838 rqstp
->rq_arg
.page_len
= len
- rqstp
->rq_arg
.head
[0].iov_len
;
839 rqstp
->rq_respages
= rqstp
->rq_pages
+ 1 +
840 DIV_ROUND_UP(rqstp
->rq_arg
.page_len
, PAGE_SIZE
);
844 serv
->sv_stats
->netudpcnt
++;
850 svc_udp_sendto(struct svc_rqst
*rqstp
)
854 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
855 if (error
== -ECONNREFUSED
)
856 /* ICMP error on earlier request. */
857 error
= svc_sendto(rqstp
, &rqstp
->rq_res
);
862 static void svc_udp_prep_reply_hdr(struct svc_rqst
*rqstp
)
866 static int svc_udp_has_wspace(struct svc_xprt
*xprt
)
868 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
869 struct svc_serv
*serv
= xprt
->xpt_server
;
870 unsigned long required
;
873 * Set the SOCK_NOSPACE flag before checking the available
876 set_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
877 required
= atomic_read(&svsk
->sk_xprt
.xpt_reserved
) + serv
->sv_max_mesg
;
878 if (required
*2 > sock_wspace(svsk
->sk_sk
))
880 clear_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
884 static struct svc_xprt
*svc_udp_accept(struct svc_xprt
*xprt
)
890 static struct svc_xprt
*svc_udp_create(struct svc_serv
*serv
,
891 struct sockaddr
*sa
, int salen
,
894 return svc_create_socket(serv
, IPPROTO_UDP
, sa
, salen
, flags
);
897 static struct svc_xprt_ops svc_udp_ops
= {
898 .xpo_create
= svc_udp_create
,
899 .xpo_recvfrom
= svc_udp_recvfrom
,
900 .xpo_sendto
= svc_udp_sendto
,
901 .xpo_release_rqst
= svc_release_skb
,
902 .xpo_detach
= svc_sock_detach
,
903 .xpo_free
= svc_sock_free
,
904 .xpo_prep_reply_hdr
= svc_udp_prep_reply_hdr
,
905 .xpo_has_wspace
= svc_udp_has_wspace
,
906 .xpo_accept
= svc_udp_accept
,
909 static struct svc_xprt_class svc_udp_class
= {
911 .xcl_owner
= THIS_MODULE
,
912 .xcl_ops
= &svc_udp_ops
,
913 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_UDP
,
916 static void svc_udp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
921 svc_xprt_init(&svc_udp_class
, &svsk
->sk_xprt
, serv
);
922 clear_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
923 svsk
->sk_sk
->sk_data_ready
= svc_udp_data_ready
;
924 svsk
->sk_sk
->sk_write_space
= svc_write_space
;
926 /* initialise setting must have enough space to
927 * receive and respond to one request.
928 * svc_udp_recvfrom will re-adjust if necessary
930 svc_sock_setbufsize(svsk
->sk_sock
,
931 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
,
932 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
);
934 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
); /* might have come in before data_ready set up */
935 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
939 /* make sure we get destination address info */
940 svsk
->sk_sock
->ops
->setsockopt(svsk
->sk_sock
, IPPROTO_IP
, IP_PKTINFO
,
941 (char __user
*)&one
, sizeof(one
));
946 * A data_ready event on a listening socket means there's a connection
947 * pending. Do not use state_change as a substitute for it.
950 svc_tcp_listen_data_ready(struct sock
*sk
, int count_unused
)
952 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
954 dprintk("svc: socket %p TCP (listen) state change %d\n",
958 * This callback may called twice when a new connection
959 * is established as a child socket inherits everything
960 * from a parent LISTEN socket.
961 * 1) data_ready method of the parent socket will be called
962 * when one of child sockets become ESTABLISHED.
963 * 2) data_ready method of the child socket may be called
964 * when it receives data before the socket is accepted.
965 * In case of 2, we should ignore it silently.
967 if (sk
->sk_state
== TCP_LISTEN
) {
969 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
970 svc_xprt_enqueue(&svsk
->sk_xprt
);
972 printk("svc: socket %p: no user data\n", sk
);
975 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
976 wake_up_interruptible_all(sk
->sk_sleep
);
980 * A state change on a connected socket means it's dying or dead.
983 svc_tcp_state_change(struct sock
*sk
)
985 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
987 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
988 sk
, sk
->sk_state
, sk
->sk_user_data
);
991 printk("svc: socket %p: no user data\n", sk
);
993 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
994 svc_xprt_enqueue(&svsk
->sk_xprt
);
996 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
997 wake_up_interruptible_all(sk
->sk_sleep
);
1001 svc_tcp_data_ready(struct sock
*sk
, int count
)
1003 struct svc_sock
*svsk
= (struct svc_sock
*)sk
->sk_user_data
;
1005 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
1006 sk
, sk
->sk_user_data
);
1008 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1009 svc_xprt_enqueue(&svsk
->sk_xprt
);
1011 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1012 wake_up_interruptible(sk
->sk_sleep
);
1015 static inline int svc_port_is_privileged(struct sockaddr
*sin
)
1017 switch (sin
->sa_family
) {
1019 return ntohs(((struct sockaddr_in
*)sin
)->sin_port
)
1022 return ntohs(((struct sockaddr_in6
*)sin
)->sin6_port
)
1030 * Accept a TCP connection
1032 static struct svc_xprt
*svc_tcp_accept(struct svc_xprt
*xprt
)
1034 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1035 struct sockaddr_storage addr
;
1036 struct sockaddr
*sin
= (struct sockaddr
*) &addr
;
1037 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
1038 struct socket
*sock
= svsk
->sk_sock
;
1039 struct socket
*newsock
;
1040 struct svc_sock
*newsvsk
;
1042 char buf
[RPC_MAX_ADDRBUFLEN
];
1044 dprintk("svc: tcp_accept %p sock %p\n", svsk
, sock
);
1048 clear_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
1049 err
= kernel_accept(sock
, &newsock
, O_NONBLOCK
);
1052 printk(KERN_WARNING
"%s: no more sockets!\n",
1054 else if (err
!= -EAGAIN
&& net_ratelimit())
1055 printk(KERN_WARNING
"%s: accept failed (err %d)!\n",
1056 serv
->sv_name
, -err
);
1059 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
1061 err
= kernel_getpeername(newsock
, sin
, &slen
);
1063 if (net_ratelimit())
1064 printk(KERN_WARNING
"%s: peername failed (err %d)!\n",
1065 serv
->sv_name
, -err
);
1066 goto failed
; /* aborted connection or whatever */
1069 /* Ideally, we would want to reject connections from unauthorized
1070 * hosts here, but when we get encryption, the IP of the host won't
1071 * tell us anything. For now just warn about unpriv connections.
1073 if (!svc_port_is_privileged(sin
)) {
1074 dprintk(KERN_WARNING
1075 "%s: connect from unprivileged port: %s\n",
1077 __svc_print_addr(sin
, buf
, sizeof(buf
)));
1079 dprintk("%s: connect from %s\n", serv
->sv_name
,
1080 __svc_print_addr(sin
, buf
, sizeof(buf
)));
1082 /* make sure that a write doesn't block forever when
1085 newsock
->sk
->sk_sndtimeo
= HZ
*30;
1087 if (!(newsvsk
= svc_setup_socket(serv
, newsock
, &err
,
1088 (SVC_SOCK_ANONYMOUS
| SVC_SOCK_TEMPORARY
))))
1090 svc_xprt_set_remote(&newsvsk
->sk_xprt
, sin
, slen
);
1091 err
= kernel_getsockname(newsock
, sin
, &slen
);
1092 if (unlikely(err
< 0)) {
1093 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err
);
1094 slen
= offsetof(struct sockaddr
, sa_data
);
1096 svc_xprt_set_local(&newsvsk
->sk_xprt
, sin
, slen
);
1099 serv
->sv_stats
->nettcpconn
++;
1101 return &newsvsk
->sk_xprt
;
1104 sock_release(newsock
);
1109 * Receive data from a TCP socket.
1112 svc_tcp_recvfrom(struct svc_rqst
*rqstp
)
1114 struct svc_sock
*svsk
= rqstp
->rq_sock
;
1115 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
1120 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1121 svsk
, test_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
),
1122 test_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
),
1123 test_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
));
1125 if (test_and_clear_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
))
1126 /* sndbuf needs to have room for one request
1127 * per thread, otherwise we can stall even when the
1128 * network isn't a bottleneck.
1130 * We count all threads rather than threads in a
1131 * particular pool, which provides an upper bound
1132 * on the number of threads which will access the socket.
1134 * rcvbuf just needs to be able to hold a few requests.
1135 * Normally they will be removed from the queue
1136 * as soon a a complete request arrives.
1138 svc_sock_setbufsize(svsk
->sk_sock
,
1139 (serv
->sv_nrthreads
+3) * serv
->sv_max_mesg
,
1140 3 * serv
->sv_max_mesg
);
1142 clear_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1144 /* Receive data. If we haven't got the record length yet, get
1145 * the next four bytes. Otherwise try to gobble up as much as
1146 * possible up to the complete record length.
1148 if (svsk
->sk_tcplen
< 4) {
1149 unsigned long want
= 4 - svsk
->sk_tcplen
;
1152 iov
.iov_base
= ((char *) &svsk
->sk_reclen
) + svsk
->sk_tcplen
;
1154 if ((len
= svc_recvfrom(rqstp
, &iov
, 1, want
)) < 0)
1156 svsk
->sk_tcplen
+= len
;
1159 dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
1161 svc_xprt_received(&svsk
->sk_xprt
);
1162 return -EAGAIN
; /* record header not complete */
1165 svsk
->sk_reclen
= ntohl(svsk
->sk_reclen
);
1166 if (!(svsk
->sk_reclen
& 0x80000000)) {
1167 /* FIXME: technically, a record can be fragmented,
1168 * and non-terminal fragments will not have the top
1169 * bit set in the fragment length header.
1170 * But apparently no known nfs clients send fragmented
1172 if (net_ratelimit())
1173 printk(KERN_NOTICE
"RPC: bad TCP reclen 0x%08lx"
1174 " (non-terminal)\n",
1175 (unsigned long) svsk
->sk_reclen
);
1178 svsk
->sk_reclen
&= 0x7fffffff;
1179 dprintk("svc: TCP record, %d bytes\n", svsk
->sk_reclen
);
1180 if (svsk
->sk_reclen
> serv
->sv_max_mesg
) {
1181 if (net_ratelimit())
1182 printk(KERN_NOTICE
"RPC: bad TCP reclen 0x%08lx"
1184 (unsigned long) svsk
->sk_reclen
);
1189 /* Check whether enough data is available */
1190 len
= svc_recv_available(svsk
);
1194 if (len
< svsk
->sk_reclen
) {
1195 dprintk("svc: incomplete TCP record (%d of %d)\n",
1196 len
, svsk
->sk_reclen
);
1197 svc_xprt_received(&svsk
->sk_xprt
);
1198 return -EAGAIN
; /* record not complete */
1200 len
= svsk
->sk_reclen
;
1201 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1203 vec
= rqstp
->rq_vec
;
1204 vec
[0] = rqstp
->rq_arg
.head
[0];
1207 while (vlen
< len
) {
1208 vec
[pnum
].iov_base
= page_address(rqstp
->rq_pages
[pnum
]);
1209 vec
[pnum
].iov_len
= PAGE_SIZE
;
1213 rqstp
->rq_respages
= &rqstp
->rq_pages
[pnum
];
1215 /* Now receive data */
1216 len
= svc_recvfrom(rqstp
, vec
, pnum
, len
);
1220 dprintk("svc: TCP complete record (%d bytes)\n", len
);
1221 rqstp
->rq_arg
.len
= len
;
1222 rqstp
->rq_arg
.page_base
= 0;
1223 if (len
<= rqstp
->rq_arg
.head
[0].iov_len
) {
1224 rqstp
->rq_arg
.head
[0].iov_len
= len
;
1225 rqstp
->rq_arg
.page_len
= 0;
1227 rqstp
->rq_arg
.page_len
= len
- rqstp
->rq_arg
.head
[0].iov_len
;
1230 rqstp
->rq_xprt_ctxt
= NULL
;
1231 rqstp
->rq_prot
= IPPROTO_TCP
;
1233 /* Reset TCP read info */
1234 svsk
->sk_reclen
= 0;
1235 svsk
->sk_tcplen
= 0;
1237 svc_xprt_copy_addrs(rqstp
, &svsk
->sk_xprt
);
1238 svc_xprt_received(&svsk
->sk_xprt
);
1240 serv
->sv_stats
->nettcpcnt
++;
1245 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1249 if (len
== -EAGAIN
) {
1250 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1251 svc_xprt_received(&svsk
->sk_xprt
);
1253 printk(KERN_NOTICE
"%s: recvfrom returned errno %d\n",
1254 svsk
->sk_xprt
.xpt_server
->sv_name
, -len
);
1262 * Send out data on TCP socket.
1265 svc_tcp_sendto(struct svc_rqst
*rqstp
)
1267 struct xdr_buf
*xbufp
= &rqstp
->rq_res
;
1271 /* Set up the first element of the reply kvec.
1272 * Any other kvecs that may be in use have been taken
1273 * care of by the server implementation itself.
1275 reclen
= htonl(0x80000000|((xbufp
->len
) - 4));
1276 memcpy(xbufp
->head
[0].iov_base
, &reclen
, 4);
1278 if (test_bit(XPT_DEAD
, &rqstp
->rq_sock
->sk_xprt
.xpt_flags
))
1281 sent
= svc_sendto(rqstp
, &rqstp
->rq_res
);
1282 if (sent
!= xbufp
->len
) {
1283 printk(KERN_NOTICE
"rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
1284 rqstp
->rq_sock
->sk_xprt
.xpt_server
->sv_name
,
1285 (sent
<0)?"got error":"sent only",
1287 set_bit(XPT_CLOSE
, &rqstp
->rq_sock
->sk_xprt
.xpt_flags
);
1288 svc_xprt_enqueue(rqstp
->rq_xprt
);
1295 * Setup response header. TCP has a 4B record length field.
1297 static void svc_tcp_prep_reply_hdr(struct svc_rqst
*rqstp
)
1299 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1301 /* tcp needs a space for the record length... */
1305 static int svc_tcp_has_wspace(struct svc_xprt
*xprt
)
1307 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1308 struct svc_serv
*serv
= svsk
->sk_xprt
.xpt_server
;
1313 * Set the SOCK_NOSPACE flag before checking the available
1316 set_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
1317 required
= atomic_read(&svsk
->sk_xprt
.xpt_reserved
) + serv
->sv_max_mesg
;
1318 wspace
= sk_stream_wspace(svsk
->sk_sk
);
1320 if (wspace
< sk_stream_min_wspace(svsk
->sk_sk
))
1322 if (required
* 2 > wspace
)
1325 clear_bit(SOCK_NOSPACE
, &svsk
->sk_sock
->flags
);
1329 static struct svc_xprt
*svc_tcp_create(struct svc_serv
*serv
,
1330 struct sockaddr
*sa
, int salen
,
1333 return svc_create_socket(serv
, IPPROTO_TCP
, sa
, salen
, flags
);
1336 static struct svc_xprt_ops svc_tcp_ops
= {
1337 .xpo_create
= svc_tcp_create
,
1338 .xpo_recvfrom
= svc_tcp_recvfrom
,
1339 .xpo_sendto
= svc_tcp_sendto
,
1340 .xpo_release_rqst
= svc_release_skb
,
1341 .xpo_detach
= svc_sock_detach
,
1342 .xpo_free
= svc_sock_free
,
1343 .xpo_prep_reply_hdr
= svc_tcp_prep_reply_hdr
,
1344 .xpo_has_wspace
= svc_tcp_has_wspace
,
1345 .xpo_accept
= svc_tcp_accept
,
1348 static struct svc_xprt_class svc_tcp_class
= {
1350 .xcl_owner
= THIS_MODULE
,
1351 .xcl_ops
= &svc_tcp_ops
,
1352 .xcl_max_payload
= RPCSVC_MAXPAYLOAD_TCP
,
1355 void svc_init_xprt_sock(void)
1357 svc_reg_xprt_class(&svc_tcp_class
);
1358 svc_reg_xprt_class(&svc_udp_class
);
1361 void svc_cleanup_xprt_sock(void)
1363 svc_unreg_xprt_class(&svc_tcp_class
);
1364 svc_unreg_xprt_class(&svc_udp_class
);
1367 static void svc_tcp_init(struct svc_sock
*svsk
, struct svc_serv
*serv
)
1369 struct sock
*sk
= svsk
->sk_sk
;
1370 struct tcp_sock
*tp
= tcp_sk(sk
);
1372 svc_xprt_init(&svc_tcp_class
, &svsk
->sk_xprt
, serv
);
1373 set_bit(XPT_CACHE_AUTH
, &svsk
->sk_xprt
.xpt_flags
);
1374 if (sk
->sk_state
== TCP_LISTEN
) {
1375 dprintk("setting up TCP socket for listening\n");
1376 set_bit(XPT_LISTENER
, &svsk
->sk_xprt
.xpt_flags
);
1377 sk
->sk_data_ready
= svc_tcp_listen_data_ready
;
1378 set_bit(XPT_CONN
, &svsk
->sk_xprt
.xpt_flags
);
1380 dprintk("setting up TCP socket for reading\n");
1381 sk
->sk_state_change
= svc_tcp_state_change
;
1382 sk
->sk_data_ready
= svc_tcp_data_ready
;
1383 sk
->sk_write_space
= svc_write_space
;
1385 svsk
->sk_reclen
= 0;
1386 svsk
->sk_tcplen
= 0;
1388 tp
->nonagle
= 1; /* disable Nagle's algorithm */
1390 /* initialise setting must have enough space to
1391 * receive and respond to one request.
1392 * svc_tcp_recvfrom will re-adjust if necessary
1394 svc_sock_setbufsize(svsk
->sk_sock
,
1395 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
,
1396 3 * svsk
->sk_xprt
.xpt_server
->sv_max_mesg
);
1398 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1399 set_bit(XPT_DATA
, &svsk
->sk_xprt
.xpt_flags
);
1400 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1401 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1406 svc_sock_update_bufs(struct svc_serv
*serv
)
1409 * The number of server threads has changed. Update
1410 * rcvbuf and sndbuf accordingly on all sockets
1412 struct list_head
*le
;
1414 spin_lock_bh(&serv
->sv_lock
);
1415 list_for_each(le
, &serv
->sv_permsocks
) {
1416 struct svc_sock
*svsk
=
1417 list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1418 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1420 list_for_each(le
, &serv
->sv_tempsocks
) {
1421 struct svc_sock
*svsk
=
1422 list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1423 set_bit(XPT_CHNGBUF
, &svsk
->sk_xprt
.xpt_flags
);
1425 spin_unlock_bh(&serv
->sv_lock
);
1429 * Make sure that we don't have too many active connections. If we
1430 * have, something must be dropped.
1432 * There's no point in trying to do random drop here for DoS
1433 * prevention. The NFS clients does 1 reconnect in 15 seconds. An
1434 * attacker can easily beat that.
1436 * The only somewhat efficient mechanism would be if drop old
1437 * connections from the same IP first. But right now we don't even
1438 * record the client IP in svc_sock.
1440 static void svc_check_conn_limits(struct svc_serv
*serv
)
1442 if (serv
->sv_tmpcnt
> (serv
->sv_nrthreads
+3)*20) {
1443 struct svc_sock
*svsk
= NULL
;
1444 spin_lock_bh(&serv
->sv_lock
);
1445 if (!list_empty(&serv
->sv_tempsocks
)) {
1446 if (net_ratelimit()) {
1447 /* Try to help the admin */
1448 printk(KERN_NOTICE
"%s: too many open TCP "
1449 "sockets, consider increasing the "
1450 "number of nfsd threads\n",
1454 * Always select the oldest socket. It's not fair,
1457 svsk
= list_entry(serv
->sv_tempsocks
.prev
,
1460 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1461 svc_xprt_get(&svsk
->sk_xprt
);
1463 spin_unlock_bh(&serv
->sv_lock
);
1466 svc_xprt_enqueue(&svsk
->sk_xprt
);
1467 svc_xprt_put(&svsk
->sk_xprt
);
1473 * Receive the next request on any socket. This code is carefully
1474 * organised not to touch any cachelines in the shared svc_serv
1475 * structure, only cachelines in the local svc_pool.
1478 svc_recv(struct svc_rqst
*rqstp
, long timeout
)
1480 struct svc_sock
*svsk
= NULL
;
1481 struct svc_serv
*serv
= rqstp
->rq_server
;
1482 struct svc_pool
*pool
= rqstp
->rq_pool
;
1485 struct xdr_buf
*arg
;
1486 DECLARE_WAITQUEUE(wait
, current
);
1488 dprintk("svc: server %p waiting for data (to = %ld)\n",
1493 "svc_recv: service %p, socket not NULL!\n",
1495 if (waitqueue_active(&rqstp
->rq_wait
))
1497 "svc_recv: service %p, wait queue active!\n",
1501 /* now allocate needed pages. If we get a failure, sleep briefly */
1502 pages
= (serv
->sv_max_mesg
+ PAGE_SIZE
) / PAGE_SIZE
;
1503 for (i
=0; i
< pages
; i
++)
1504 while (rqstp
->rq_pages
[i
] == NULL
) {
1505 struct page
*p
= alloc_page(GFP_KERNEL
);
1507 schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1508 rqstp
->rq_pages
[i
] = p
;
1510 rqstp
->rq_pages
[i
++] = NULL
; /* this might be seen in nfs_read_actor */
1511 BUG_ON(pages
>= RPCSVC_MAXPAGES
);
1513 /* Make arg->head point to first page and arg->pages point to rest */
1514 arg
= &rqstp
->rq_arg
;
1515 arg
->head
[0].iov_base
= page_address(rqstp
->rq_pages
[0]);
1516 arg
->head
[0].iov_len
= PAGE_SIZE
;
1517 arg
->pages
= rqstp
->rq_pages
+ 1;
1519 /* save at least one page for response */
1520 arg
->page_len
= (pages
-2)*PAGE_SIZE
;
1521 arg
->len
= (pages
-1)*PAGE_SIZE
;
1522 arg
->tail
[0].iov_len
= 0;
1529 spin_lock_bh(&pool
->sp_lock
);
1530 if ((svsk
= svc_sock_dequeue(pool
)) != NULL
) {
1531 rqstp
->rq_sock
= svsk
;
1532 svc_xprt_get(&svsk
->sk_xprt
);
1533 rqstp
->rq_reserved
= serv
->sv_max_mesg
;
1534 atomic_add(rqstp
->rq_reserved
, &svsk
->sk_xprt
.xpt_reserved
);
1536 /* No data pending. Go to sleep */
1537 svc_thread_enqueue(pool
, rqstp
);
1540 * We have to be able to interrupt this wait
1541 * to bring down the daemons ...
1543 set_current_state(TASK_INTERRUPTIBLE
);
1544 add_wait_queue(&rqstp
->rq_wait
, &wait
);
1545 spin_unlock_bh(&pool
->sp_lock
);
1547 schedule_timeout(timeout
);
1551 spin_lock_bh(&pool
->sp_lock
);
1552 remove_wait_queue(&rqstp
->rq_wait
, &wait
);
1554 if (!(svsk
= rqstp
->rq_sock
)) {
1555 svc_thread_dequeue(pool
, rqstp
);
1556 spin_unlock_bh(&pool
->sp_lock
);
1557 dprintk("svc: server %p, no data yet\n", rqstp
);
1558 return signalled()? -EINTR
: -EAGAIN
;
1561 spin_unlock_bh(&pool
->sp_lock
);
1564 if (test_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
)) {
1565 dprintk("svc_recv: found XPT_CLOSE\n");
1566 svc_delete_xprt(&svsk
->sk_xprt
);
1567 } else if (test_bit(XPT_LISTENER
, &svsk
->sk_xprt
.xpt_flags
)) {
1568 struct svc_xprt
*newxpt
;
1569 newxpt
= svsk
->sk_xprt
.xpt_ops
->xpo_accept(&svsk
->sk_xprt
);
1572 * We know this module_get will succeed because the
1573 * listener holds a reference too
1575 __module_get(newxpt
->xpt_class
->xcl_owner
);
1576 svc_check_conn_limits(svsk
->sk_xprt
.xpt_server
);
1577 svc_xprt_received(newxpt
);
1579 svc_xprt_received(&svsk
->sk_xprt
);
1581 dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n",
1582 rqstp
, pool
->sp_id
, svsk
,
1583 atomic_read(&svsk
->sk_xprt
.xpt_ref
.refcount
));
1584 rqstp
->rq_deferred
= svc_deferred_dequeue(&svsk
->sk_xprt
);
1585 if (rqstp
->rq_deferred
) {
1586 svc_xprt_received(&svsk
->sk_xprt
);
1587 len
= svc_deferred_recv(rqstp
);
1589 len
= svsk
->sk_xprt
.xpt_ops
->xpo_recvfrom(rqstp
);
1590 dprintk("svc: got len=%d\n", len
);
1593 /* No data, incomplete (TCP) read, or accept() */
1594 if (len
== 0 || len
== -EAGAIN
) {
1595 rqstp
->rq_res
.len
= 0;
1596 svc_sock_release(rqstp
);
1599 clear_bit(XPT_OLD
, &svsk
->sk_xprt
.xpt_flags
);
1601 rqstp
->rq_secure
= svc_port_is_privileged(svc_addr(rqstp
));
1602 rqstp
->rq_chandle
.defer
= svc_defer
;
1605 serv
->sv_stats
->netcnt
++;
1613 svc_drop(struct svc_rqst
*rqstp
)
1615 dprintk("svc: socket %p dropped request\n", rqstp
->rq_sock
);
1616 svc_sock_release(rqstp
);
1620 * Return reply to client.
1623 svc_send(struct svc_rqst
*rqstp
)
1625 struct svc_xprt
*xprt
;
1629 xprt
= rqstp
->rq_xprt
;
1633 /* release the receive skb before sending the reply */
1634 rqstp
->rq_xprt
->xpt_ops
->xpo_release_rqst(rqstp
);
1636 /* calculate over-all length */
1637 xb
= & rqstp
->rq_res
;
1638 xb
->len
= xb
->head
[0].iov_len
+
1640 xb
->tail
[0].iov_len
;
1642 /* Grab mutex to serialize outgoing data. */
1643 mutex_lock(&xprt
->xpt_mutex
);
1644 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
1647 len
= xprt
->xpt_ops
->xpo_sendto(rqstp
);
1648 mutex_unlock(&xprt
->xpt_mutex
);
1649 svc_sock_release(rqstp
);
1651 if (len
== -ECONNREFUSED
|| len
== -ENOTCONN
|| len
== -EAGAIN
)
1657 * Timer function to close old temporary sockets, using
1658 * a mark-and-sweep algorithm.
1661 svc_age_temp_sockets(unsigned long closure
)
1663 struct svc_serv
*serv
= (struct svc_serv
*)closure
;
1664 struct svc_sock
*svsk
;
1665 struct list_head
*le
, *next
;
1666 LIST_HEAD(to_be_aged
);
1668 dprintk("svc_age_temp_sockets\n");
1670 if (!spin_trylock_bh(&serv
->sv_lock
)) {
1671 /* busy, try again 1 sec later */
1672 dprintk("svc_age_temp_sockets: busy\n");
1673 mod_timer(&serv
->sv_temptimer
, jiffies
+ HZ
);
1677 list_for_each_safe(le
, next
, &serv
->sv_tempsocks
) {
1678 svsk
= list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1680 if (!test_and_set_bit(XPT_OLD
, &svsk
->sk_xprt
.xpt_flags
))
1682 if (atomic_read(&svsk
->sk_xprt
.xpt_ref
.refcount
) > 1
1683 || test_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
))
1685 svc_xprt_get(&svsk
->sk_xprt
);
1686 list_move(le
, &to_be_aged
);
1687 set_bit(XPT_CLOSE
, &svsk
->sk_xprt
.xpt_flags
);
1688 set_bit(XPT_DETACHED
, &svsk
->sk_xprt
.xpt_flags
);
1690 spin_unlock_bh(&serv
->sv_lock
);
1692 while (!list_empty(&to_be_aged
)) {
1693 le
= to_be_aged
.next
;
1694 /* fiddling the sk_xprt.xpt_list node is safe 'cos we're XPT_DETACHED */
1696 svsk
= list_entry(le
, struct svc_sock
, sk_xprt
.xpt_list
);
1698 dprintk("queuing svsk %p for closing\n", svsk
);
1700 /* a thread will dequeue and close it soon */
1701 svc_xprt_enqueue(&svsk
->sk_xprt
);
1702 svc_xprt_put(&svsk
->sk_xprt
);
1705 mod_timer(&serv
->sv_temptimer
, jiffies
+ svc_conn_age_period
* HZ
);
1709 * Initialize socket for RPC use and create svc_sock struct
1710 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1712 static struct svc_sock
*svc_setup_socket(struct svc_serv
*serv
,
1713 struct socket
*sock
,
1714 int *errp
, int flags
)
1716 struct svc_sock
*svsk
;
1718 int pmap_register
= !(flags
& SVC_SOCK_ANONYMOUS
);
1719 int is_temporary
= flags
& SVC_SOCK_TEMPORARY
;
1721 dprintk("svc: svc_setup_socket %p\n", sock
);
1722 if (!(svsk
= kzalloc(sizeof(*svsk
), GFP_KERNEL
))) {
1729 /* Register socket with portmapper */
1730 if (*errp
>= 0 && pmap_register
)
1731 *errp
= svc_register(serv
, inet
->sk_protocol
,
1732 ntohs(inet_sk(inet
)->sport
));
1739 set_bit(XPT_BUSY
, &svsk
->sk_xprt
.xpt_flags
);
1740 inet
->sk_user_data
= svsk
;
1741 svsk
->sk_sock
= sock
;
1743 svsk
->sk_ostate
= inet
->sk_state_change
;
1744 svsk
->sk_odata
= inet
->sk_data_ready
;
1745 svsk
->sk_owspace
= inet
->sk_write_space
;
1747 /* Initialize the socket */
1748 if (sock
->type
== SOCK_DGRAM
)
1749 svc_udp_init(svsk
, serv
);
1751 svc_tcp_init(svsk
, serv
);
1753 spin_lock_bh(&serv
->sv_lock
);
1755 set_bit(XPT_TEMP
, &svsk
->sk_xprt
.xpt_flags
);
1756 list_add(&svsk
->sk_xprt
.xpt_list
, &serv
->sv_tempsocks
);
1758 if (serv
->sv_temptimer
.function
== NULL
) {
1759 /* setup timer to age temp sockets */
1760 setup_timer(&serv
->sv_temptimer
, svc_age_temp_sockets
,
1761 (unsigned long)serv
);
1762 mod_timer(&serv
->sv_temptimer
,
1763 jiffies
+ svc_conn_age_period
* HZ
);
1766 clear_bit(XPT_TEMP
, &svsk
->sk_xprt
.xpt_flags
);
1767 list_add(&svsk
->sk_xprt
.xpt_list
, &serv
->sv_permsocks
);
1769 spin_unlock_bh(&serv
->sv_lock
);
1771 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1777 int svc_addsock(struct svc_serv
*serv
,
1783 struct socket
*so
= sockfd_lookup(fd
, &err
);
1784 struct svc_sock
*svsk
= NULL
;
1788 if (so
->sk
->sk_family
!= AF_INET
)
1789 err
= -EAFNOSUPPORT
;
1790 else if (so
->sk
->sk_protocol
!= IPPROTO_TCP
&&
1791 so
->sk
->sk_protocol
!= IPPROTO_UDP
)
1792 err
= -EPROTONOSUPPORT
;
1793 else if (so
->state
> SS_UNCONNECTED
)
1796 svsk
= svc_setup_socket(serv
, so
, &err
, SVC_SOCK_DEFAULTS
);
1798 struct sockaddr_storage addr
;
1799 struct sockaddr
*sin
= (struct sockaddr
*)&addr
;
1801 if (kernel_getsockname(svsk
->sk_sock
, sin
, &salen
) == 0)
1802 svc_xprt_set_local(&svsk
->sk_xprt
, sin
, salen
);
1803 svc_xprt_received(&svsk
->sk_xprt
);
1811 if (proto
) *proto
= so
->sk
->sk_protocol
;
1812 return one_sock_name(name_return
, svsk
);
1814 EXPORT_SYMBOL_GPL(svc_addsock
);
1817 * Create socket for RPC service.
1819 static struct svc_xprt
*svc_create_socket(struct svc_serv
*serv
,
1821 struct sockaddr
*sin
, int len
,
1824 struct svc_sock
*svsk
;
1825 struct socket
*sock
;
1828 char buf
[RPC_MAX_ADDRBUFLEN
];
1829 struct sockaddr_storage addr
;
1830 struct sockaddr
*newsin
= (struct sockaddr
*)&addr
;
1833 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1834 serv
->sv_program
->pg_name
, protocol
,
1835 __svc_print_addr(sin
, buf
, sizeof(buf
)));
1837 if (protocol
!= IPPROTO_UDP
&& protocol
!= IPPROTO_TCP
) {
1838 printk(KERN_WARNING
"svc: only UDP and TCP "
1839 "sockets supported\n");
1840 return ERR_PTR(-EINVAL
);
1842 type
= (protocol
== IPPROTO_UDP
)? SOCK_DGRAM
: SOCK_STREAM
;
1844 error
= sock_create_kern(sin
->sa_family
, type
, protocol
, &sock
);
1846 return ERR_PTR(error
);
1848 svc_reclassify_socket(sock
);
1850 if (type
== SOCK_STREAM
)
1851 sock
->sk
->sk_reuse
= 1; /* allow address reuse */
1852 error
= kernel_bind(sock
, sin
, len
);
1857 error
= kernel_getsockname(sock
, newsin
, &newlen
);
1861 if (protocol
== IPPROTO_TCP
) {
1862 if ((error
= kernel_listen(sock
, 64)) < 0)
1866 if ((svsk
= svc_setup_socket(serv
, sock
, &error
, flags
)) != NULL
) {
1867 svc_xprt_set_local(&svsk
->sk_xprt
, newsin
, newlen
);
1868 svc_xprt_received(&svsk
->sk_xprt
);
1869 return (struct svc_xprt
*)svsk
;
1873 dprintk("svc: svc_create_socket error = %d\n", -error
);
1875 return ERR_PTR(error
);
1879 * Detach the svc_sock from the socket so that no
1880 * more callbacks occur.
1882 static void svc_sock_detach(struct svc_xprt
*xprt
)
1884 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1885 struct sock
*sk
= svsk
->sk_sk
;
1887 dprintk("svc: svc_sock_detach(%p)\n", svsk
);
1889 /* put back the old socket callbacks */
1890 sk
->sk_state_change
= svsk
->sk_ostate
;
1891 sk
->sk_data_ready
= svsk
->sk_odata
;
1892 sk
->sk_write_space
= svsk
->sk_owspace
;
1896 * Free the svc_sock's socket resources and the svc_sock itself.
1898 static void svc_sock_free(struct svc_xprt
*xprt
)
1900 struct svc_sock
*svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1901 dprintk("svc: svc_sock_free(%p)\n", svsk
);
1903 if (svsk
->sk_sock
->file
)
1904 sockfd_put(svsk
->sk_sock
);
1906 sock_release(svsk
->sk_sock
);
1911 * Remove a dead transport
1913 static void svc_delete_xprt(struct svc_xprt
*xprt
)
1915 struct svc_serv
*serv
= xprt
->xpt_server
;
1917 dprintk("svc: svc_delete_xprt(%p)\n", xprt
);
1918 xprt
->xpt_ops
->xpo_detach(xprt
);
1920 spin_lock_bh(&serv
->sv_lock
);
1921 if (!test_and_set_bit(XPT_DETACHED
, &xprt
->xpt_flags
))
1922 list_del_init(&xprt
->xpt_list
);
1924 * We used to delete the transport from whichever list
1925 * it's sk_xprt.xpt_ready node was on, but we don't actually
1926 * need to. This is because the only time we're called
1927 * while still attached to a queue, the queue itself
1928 * is about to be destroyed (in svc_destroy).
1930 if (!test_and_set_bit(XPT_DEAD
, &xprt
->xpt_flags
)) {
1931 BUG_ON(atomic_read(&xprt
->xpt_ref
.refcount
) < 2);
1932 if (test_bit(XPT_TEMP
, &xprt
->xpt_flags
))
1936 spin_unlock_bh(&serv
->sv_lock
);
1939 static void svc_close_xprt(struct svc_xprt
*xprt
)
1941 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1942 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
))
1943 /* someone else will have to effect the close */
1947 svc_delete_xprt(xprt
);
1948 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
1952 void svc_close_all(struct list_head
*xprt_list
)
1954 struct svc_xprt
*xprt
;
1955 struct svc_xprt
*tmp
;
1957 list_for_each_entry_safe(xprt
, tmp
, xprt_list
, xpt_list
) {
1958 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1959 if (test_bit(XPT_BUSY
, &xprt
->xpt_flags
)) {
1960 /* Waiting to be processed, but no threads left,
1961 * So just remove it from the waiting list
1963 list_del_init(&xprt
->xpt_ready
);
1964 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
1966 svc_close_xprt(xprt
);
1971 * Handle defer and revisit of requests
1974 static void svc_revisit(struct cache_deferred_req
*dreq
, int too_many
)
1976 struct svc_deferred_req
*dr
= container_of(dreq
, struct svc_deferred_req
, handle
);
1977 struct svc_xprt
*xprt
= dr
->xprt
;
1984 dprintk("revisit queued\n");
1986 spin_lock(&xprt
->xpt_lock
);
1987 list_add(&dr
->handle
.recent
, &xprt
->xpt_deferred
);
1988 spin_unlock(&xprt
->xpt_lock
);
1989 set_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
1990 svc_xprt_enqueue(xprt
);
1994 static struct cache_deferred_req
*
1995 svc_defer(struct cache_req
*req
)
1997 struct svc_rqst
*rqstp
= container_of(req
, struct svc_rqst
, rq_chandle
);
1998 int size
= sizeof(struct svc_deferred_req
) + (rqstp
->rq_arg
.len
);
1999 struct svc_deferred_req
*dr
;
2001 if (rqstp
->rq_arg
.page_len
)
2002 return NULL
; /* if more than a page, give up FIXME */
2003 if (rqstp
->rq_deferred
) {
2004 dr
= rqstp
->rq_deferred
;
2005 rqstp
->rq_deferred
= NULL
;
2007 int skip
= rqstp
->rq_arg
.len
- rqstp
->rq_arg
.head
[0].iov_len
;
2008 /* FIXME maybe discard if size too large */
2009 dr
= kmalloc(size
, GFP_KERNEL
);
2013 dr
->handle
.owner
= rqstp
->rq_server
;
2014 dr
->prot
= rqstp
->rq_prot
;
2015 memcpy(&dr
->addr
, &rqstp
->rq_addr
, rqstp
->rq_addrlen
);
2016 dr
->addrlen
= rqstp
->rq_addrlen
;
2017 dr
->daddr
= rqstp
->rq_daddr
;
2018 dr
->argslen
= rqstp
->rq_arg
.len
>> 2;
2019 memcpy(dr
->args
, rqstp
->rq_arg
.head
[0].iov_base
-skip
, dr
->argslen
<<2);
2021 svc_xprt_get(rqstp
->rq_xprt
);
2022 dr
->xprt
= rqstp
->rq_xprt
;
2024 dr
->handle
.revisit
= svc_revisit
;
2029 * recv data from a deferred request into an active one
2031 static int svc_deferred_recv(struct svc_rqst
*rqstp
)
2033 struct svc_deferred_req
*dr
= rqstp
->rq_deferred
;
2035 rqstp
->rq_arg
.head
[0].iov_base
= dr
->args
;
2036 rqstp
->rq_arg
.head
[0].iov_len
= dr
->argslen
<<2;
2037 rqstp
->rq_arg
.page_len
= 0;
2038 rqstp
->rq_arg
.len
= dr
->argslen
<<2;
2039 rqstp
->rq_prot
= dr
->prot
;
2040 memcpy(&rqstp
->rq_addr
, &dr
->addr
, dr
->addrlen
);
2041 rqstp
->rq_addrlen
= dr
->addrlen
;
2042 rqstp
->rq_daddr
= dr
->daddr
;
2043 rqstp
->rq_respages
= rqstp
->rq_pages
;
2044 return dr
->argslen
<<2;
2048 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
)
2050 struct svc_deferred_req
*dr
= NULL
;
2052 if (!test_bit(XPT_DEFERRED
, &xprt
->xpt_flags
))
2054 spin_lock(&xprt
->xpt_lock
);
2055 clear_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
2056 if (!list_empty(&xprt
->xpt_deferred
)) {
2057 dr
= list_entry(xprt
->xpt_deferred
.next
,
2058 struct svc_deferred_req
,
2060 list_del_init(&dr
->handle
.recent
);
2061 set_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
2063 spin_unlock(&xprt
->xpt_lock
);