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cfq-iosched: limit coop preemption
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / svcsock.c
blobccc5e83cae5d25cf592237025167d6d1b9d9c7bd
1 /*
2 * linux/net/sunrpc/svcsock.c
3 *
4 * These are the RPC server socket internals.
5 *
6 * The server scheduling algorithm does not always distribute the load
7 * evenly when servicing a single client. May need to modify the
8 * svc_xprt_enqueue procedure...
9 *
10 * TCP support is largely untested and may be a little slow. The problem
11 * is that we currently do two separate recvfrom's, one for the 4-byte
12 * record length, and the second for the actual record. This could possibly
13 * be improved by always reading a minimum size of around 100 bytes and
14 * tucking any superfluous bytes away in a temporary store. Still, that
15 * leaves write requests out in the rain. An alternative may be to peek at
16 * the first skb in the queue, and if it matches the next TCP sequence
17 * number, to extract the record marker. Yuck.
18 *
19 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/errno.h>
25 #include <linux/fcntl.h>
26 #include <linux/net.h>
27 #include <linux/in.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>
37 #include <net/sock.h>
38 #include <net/checksum.h>
39 #include <net/ip.h>
40 #include <net/ipv6.h>
41 #include <net/tcp.h>
42 #include <net/tcp_states.h>
43 #include <asm/uaccess.h>
44 #include <asm/ioctls.h>
45
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>
52 #include <linux/sunrpc/xprt.h>
53
54 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
55
56
57 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
58 int *errp, int flags);
59 static void svc_udp_data_ready(struct sock *, int);
60 static int svc_udp_recvfrom(struct svc_rqst *);
61 static int svc_udp_sendto(struct svc_rqst *);
62 static void svc_sock_detach(struct svc_xprt *);
63 static void svc_tcp_sock_detach(struct svc_xprt *);
64 static void svc_sock_free(struct svc_xprt *);
65
66 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
67 struct sockaddr *, int, int);
68 #ifdef CONFIG_DEBUG_LOCK_ALLOC
69 static struct lock_class_key svc_key[2];
70 static struct lock_class_key svc_slock_key[2];
71
72 static void svc_reclassify_socket(struct socket *sock)
73 {
74 struct sock *sk = sock->sk;
75 BUG_ON(sock_owned_by_user(sk));
76 switch (sk->sk_family) {
77 case AF_INET:
78 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
79 &svc_slock_key[0],
80 "sk_xprt.xpt_lock-AF_INET-NFSD",
81 &svc_key[0]);
82 break;
83
84 case AF_INET6:
85 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
86 &svc_slock_key[1],
87 "sk_xprt.xpt_lock-AF_INET6-NFSD",
88 &svc_key[1]);
89 break;
90
91 default:
92 BUG();
93 }
94 }
95 #else
96 static void svc_reclassify_socket(struct socket *sock)
97 {
98 }
99 #endif
100
101 /*
102 * Release an skbuff after use
103 */
104 static void svc_release_skb(struct svc_rqst *rqstp)
105 {
106 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
107
108 if (skb) {
109 struct svc_sock *svsk =
110 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
111 rqstp->rq_xprt_ctxt = NULL;
112
113 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
114 skb_free_datagram(svsk->sk_sk, skb);
115 }
116 }
117
118 union svc_pktinfo_u {
119 struct in_pktinfo pkti;
120 struct in6_pktinfo pkti6;
121 };
122 #define SVC_PKTINFO_SPACE \
123 CMSG_SPACE(sizeof(union svc_pktinfo_u))
124
125 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
126 {
127 struct svc_sock *svsk =
128 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
129 switch (svsk->sk_sk->sk_family) {
130 case AF_INET: {
131 struct in_pktinfo *pki = CMSG_DATA(cmh);
132
133 cmh->cmsg_level = SOL_IP;
134 cmh->cmsg_type = IP_PKTINFO;
135 pki->ipi_ifindex = 0;
136 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
137 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
138 }
139 break;
140
141 case AF_INET6: {
142 struct in6_pktinfo *pki = CMSG_DATA(cmh);
143
144 cmh->cmsg_level = SOL_IPV6;
145 cmh->cmsg_type = IPV6_PKTINFO;
146 pki->ipi6_ifindex = 0;
147 ipv6_addr_copy(&pki->ipi6_addr,
148 &rqstp->rq_daddr.addr6);
149 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
150 }
151 break;
152 }
153 return;
154 }
155
156 /*
157 * send routine intended to be shared by the fore- and back-channel
158 */
159 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
160 struct page *headpage, unsigned long headoffset,
161 struct page *tailpage, unsigned long tailoffset)
162 {
163 int result;
164 int size;
165 struct page **ppage = xdr->pages;
166 size_t base = xdr->page_base;
167 unsigned int pglen = xdr->page_len;
168 unsigned int flags = MSG_MORE;
169 int slen;
170 int len = 0;
171
172 slen = xdr->len;
173
174 /* send head */
175 if (slen == xdr->head[0].iov_len)
176 flags = 0;
177 len = kernel_sendpage(sock, headpage, headoffset,
178 xdr->head[0].iov_len, flags);
179 if (len != xdr->head[0].iov_len)
180 goto out;
181 slen -= xdr->head[0].iov_len;
182 if (slen == 0)
183 goto out;
184
185 /* send page data */
186 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
187 while (pglen > 0) {
188 if (slen == size)
189 flags = 0;
190 result = kernel_sendpage(sock, *ppage, base, size, flags);
191 if (result > 0)
192 len += result;
193 if (result != size)
194 goto out;
195 slen -= size;
196 pglen -= size;
197 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
198 base = 0;
199 ppage++;
200 }
201
202 /* send tail */
203 if (xdr->tail[0].iov_len) {
204 result = kernel_sendpage(sock, tailpage, tailoffset,
205 xdr->tail[0].iov_len, 0);
206 if (result > 0)
207 len += result;
208 }
209
210 out:
211 return len;
212 }
213
214
215 /*
216 * Generic sendto routine
217 */
218 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
219 {
220 struct svc_sock *svsk =
221 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
222 struct socket *sock = svsk->sk_sock;
223 union {
224 struct cmsghdr hdr;
225 long all[SVC_PKTINFO_SPACE / sizeof(long)];
226 } buffer;
227 struct cmsghdr *cmh = &buffer.hdr;
228 int len = 0;
229 unsigned long tailoff;
230 unsigned long headoff;
231 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
232
233 if (rqstp->rq_prot == IPPROTO_UDP) {
234 struct msghdr msg = {
235 .msg_name = &rqstp->rq_addr,
236 .msg_namelen = rqstp->rq_addrlen,
237 .msg_control = cmh,
238 .msg_controllen = sizeof(buffer),
239 .msg_flags = MSG_MORE,
240 };
241
242 svc_set_cmsg_data(rqstp, cmh);
243
244 if (sock_sendmsg(sock, &msg, 0) < 0)
245 goto out;
246 }
247
248 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
249 headoff = 0;
250 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
251 rqstp->rq_respages[0], tailoff);
252
253 out:
254 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
255 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
256 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
257
258 return len;
259 }
260
261 /*
262 * Report socket names for nfsdfs
263 */
264 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
265 {
266 const struct sock *sk = svsk->sk_sk;
267 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
268 "udp" : "tcp";
269 int len;
270
271 switch (sk->sk_family) {
272 case PF_INET:
273 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
274 proto_name,
275 &inet_sk(sk)->rcv_saddr,
276 inet_sk(sk)->num);
277 break;
278 case PF_INET6:
279 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
280 proto_name,
281 &inet6_sk(sk)->rcv_saddr,
282 inet_sk(sk)->num);
283 break;
284 default:
285 len = snprintf(buf, remaining, "*unknown-%d*\n",
286 sk->sk_family);
287 }
288
289 if (len >= remaining) {
290 *buf = '\0';
291 return -ENAMETOOLONG;
292 }
293 return len;
294 }
295
296 /**
297 * svc_sock_names - construct a list of listener names in a string
298 * @serv: pointer to RPC service
299 * @buf: pointer to a buffer to fill in with socket names
300 * @buflen: size of the buffer to be filled
301 * @toclose: pointer to '\0'-terminated C string containing the name
302 * of a listener to be closed
303 *
304 * Fills in @buf with a '\n'-separated list of names of listener
305 * sockets. If @toclose is not NULL, the socket named by @toclose
306 * is closed, and is not included in the output list.
307 *
308 * Returns positive length of the socket name string, or a negative
309 * errno value on error.
310 */
311 int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
312 const char *toclose)
313 {
314 struct svc_sock *svsk, *closesk = NULL;
315 int len = 0;
316
317 if (!serv)
318 return 0;
319
320 spin_lock_bh(&serv->sv_lock);
321 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
322 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
323 if (onelen < 0) {
324 len = onelen;
325 break;
326 }
327 if (toclose && strcmp(toclose, buf + len) == 0)
328 closesk = svsk;
329 else
330 len += onelen;
331 }
332 spin_unlock_bh(&serv->sv_lock);
333
334 if (closesk)
335 /* Should unregister with portmap, but you cannot
336 * unregister just one protocol...
337 */
338 svc_close_xprt(&closesk->sk_xprt);
339 else if (toclose)
340 return -ENOENT;
341 return len;
342 }
343 EXPORT_SYMBOL_GPL(svc_sock_names);
344
345 /*
346 * Check input queue length
347 */
348 static int svc_recv_available(struct svc_sock *svsk)
349 {
350 struct socket *sock = svsk->sk_sock;
351 int avail, err;
352
353 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
354
355 return (err >= 0)? avail : err;
356 }
357
358 /*
359 * Generic recvfrom routine.
360 */
361 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
362 int buflen)
363 {
364 struct svc_sock *svsk =
365 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
366 struct msghdr msg = {
367 .msg_flags = MSG_DONTWAIT,
368 };
369 int len;
370
371 rqstp->rq_xprt_hlen = 0;
372
373 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
374 msg.msg_flags);
375
376 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
377 svsk, iov[0].iov_base, iov[0].iov_len, len);
378 return len;
379 }
380
381 /*
382 * Set socket snd and rcv buffer lengths
383 */
384 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
385 unsigned int rcv)
386 {
387 #if 0
388 mm_segment_t oldfs;
389 oldfs = get_fs(); set_fs(KERNEL_DS);
390 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
391 (char*)&snd, sizeof(snd));
392 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
393 (char*)&rcv, sizeof(rcv));
394 #else
395 /* sock_setsockopt limits use to sysctl_?mem_max,
396 * which isn't acceptable. Until that is made conditional
397 * on not having CAP_SYS_RESOURCE or similar, we go direct...
398 * DaveM said I could!
399 */
400 lock_sock(sock->sk);
401 sock->sk->sk_sndbuf = snd * 2;
402 sock->sk->sk_rcvbuf = rcv * 2;
403 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
404 sock->sk->sk_write_space(sock->sk);
405 release_sock(sock->sk);
406 #endif
407 }
408 /*
409 * INET callback when data has been received on the socket.
410 */
411 static void svc_udp_data_ready(struct sock *sk, int count)
412 {
413 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
414
415 if (svsk) {
416 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
417 svsk, sk, count,
418 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
419 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
420 svc_xprt_enqueue(&svsk->sk_xprt);
421 }
422 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
423 wake_up_interruptible(sk->sk_sleep);
424 }
425
426 /*
427 * INET callback when space is newly available on the socket.
428 */
429 static void svc_write_space(struct sock *sk)
430 {
431 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
432
433 if (svsk) {
434 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
435 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
436 svc_xprt_enqueue(&svsk->sk_xprt);
437 }
438
439 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
440 dprintk("RPC svc_write_space: someone sleeping on %p\n",
441 svsk);
442 wake_up_interruptible(sk->sk_sleep);
443 }
444 }
445
446 static void svc_tcp_write_space(struct sock *sk)
447 {
448 struct socket *sock = sk->sk_socket;
449
450 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
451 clear_bit(SOCK_NOSPACE, &sock->flags);
452 svc_write_space(sk);
453 }
454
455 /*
456 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
457 */
458 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
459 struct cmsghdr *cmh)
460 {
461 struct in_pktinfo *pki = CMSG_DATA(cmh);
462 if (cmh->cmsg_type != IP_PKTINFO)
463 return 0;
464 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
465 return 1;
466 }
467
468 /*
469 * See net/ipv6/datagram.c : datagram_recv_ctl
470 */
471 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
472 struct cmsghdr *cmh)
473 {
474 struct in6_pktinfo *pki = CMSG_DATA(cmh);
475 if (cmh->cmsg_type != IPV6_PKTINFO)
476 return 0;
477 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
478 return 1;
479 }
480
481 /*
482 * Copy the UDP datagram's destination address to the rqstp structure.
483 * The 'destination' address in this case is the address to which the
484 * peer sent the datagram, i.e. our local address. For multihomed
485 * hosts, this can change from msg to msg. Note that only the IP
486 * address changes, the port number should remain the same.
487 */
488 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
489 struct cmsghdr *cmh)
490 {
491 switch (cmh->cmsg_level) {
492 case SOL_IP:
493 return svc_udp_get_dest_address4(rqstp, cmh);
494 case SOL_IPV6:
495 return svc_udp_get_dest_address6(rqstp, cmh);
496 }
497
498 return 0;
499 }
500
501 /*
502 * Receive a datagram from a UDP socket.
503 */
504 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
505 {
506 struct svc_sock *svsk =
507 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
508 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
509 struct sk_buff *skb;
510 union {
511 struct cmsghdr hdr;
512 long all[SVC_PKTINFO_SPACE / sizeof(long)];
513 } buffer;
514 struct cmsghdr *cmh = &buffer.hdr;
515 struct msghdr msg = {
516 .msg_name = svc_addr(rqstp),
517 .msg_control = cmh,
518 .msg_controllen = sizeof(buffer),
519 .msg_flags = MSG_DONTWAIT,
520 };
521 size_t len;
522 int err;
523
524 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
525 /* udp sockets need large rcvbuf as all pending
526 * requests are still in that buffer. sndbuf must
527 * also be large enough that there is enough space
528 * for one reply per thread. We count all threads
529 * rather than threads in a particular pool, which
530 * provides an upper bound on the number of threads
531 * which will access the socket.
532 */
533 svc_sock_setbufsize(svsk->sk_sock,
534 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
535 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
536
537 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
538 skb = NULL;
539 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
540 0, 0, MSG_PEEK | MSG_DONTWAIT);
541 if (err >= 0)
542 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
543
544 if (skb == NULL) {
545 if (err != -EAGAIN) {
546 /* possibly an icmp error */
547 dprintk("svc: recvfrom returned error %d\n", -err);
548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
549 }
550 svc_xprt_received(&svsk->sk_xprt);
551 return -EAGAIN;
552 }
553 len = svc_addr_len(svc_addr(rqstp));
554 if (len == 0)
555 return -EAFNOSUPPORT;
556 rqstp->rq_addrlen = len;
557 if (skb->tstamp.tv64 == 0) {
558 skb->tstamp = ktime_get_real();
559 /* Don't enable netstamp, sunrpc doesn't
560 need that much accuracy */
561 }
562 svsk->sk_sk->sk_stamp = skb->tstamp;
563 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
564
565 /*
566 * Maybe more packets - kick another thread ASAP.
567 */
568 svc_xprt_received(&svsk->sk_xprt);
569
570 len = skb->len - sizeof(struct udphdr);
571 rqstp->rq_arg.len = len;
572
573 rqstp->rq_prot = IPPROTO_UDP;
574
575 if (!svc_udp_get_dest_address(rqstp, cmh)) {
576 if (net_ratelimit())
577 printk(KERN_WARNING
578 "svc: received unknown control message %d/%d; "
579 "dropping RPC reply datagram\n",
580 cmh->cmsg_level, cmh->cmsg_type);
581 skb_free_datagram(svsk->sk_sk, skb);
582 return 0;
583 }
584
585 if (skb_is_nonlinear(skb)) {
586 /* we have to copy */
587 local_bh_disable();
588 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
589 local_bh_enable();
590 /* checksum error */
591 skb_free_datagram(svsk->sk_sk, skb);
592 return 0;
593 }
594 local_bh_enable();
595 skb_free_datagram(svsk->sk_sk, skb);
596 } else {
597 /* we can use it in-place */
598 rqstp->rq_arg.head[0].iov_base = skb->data +
599 sizeof(struct udphdr);
600 rqstp->rq_arg.head[0].iov_len = len;
601 if (skb_checksum_complete(skb)) {
602 skb_free_datagram(svsk->sk_sk, skb);
603 return 0;
604 }
605 rqstp->rq_xprt_ctxt = skb;
606 }
607
608 rqstp->rq_arg.page_base = 0;
609 if (len <= rqstp->rq_arg.head[0].iov_len) {
610 rqstp->rq_arg.head[0].iov_len = len;
611 rqstp->rq_arg.page_len = 0;
612 rqstp->rq_respages = rqstp->rq_pages+1;
613 } else {
614 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
615 rqstp->rq_respages = rqstp->rq_pages + 1 +
616 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
617 }
618
619 if (serv->sv_stats)
620 serv->sv_stats->netudpcnt++;
621
622 return len;
623 }
624
625 static int
626 svc_udp_sendto(struct svc_rqst *rqstp)
627 {
628 int error;
629
630 error = svc_sendto(rqstp, &rqstp->rq_res);
631 if (error == -ECONNREFUSED)
632 /* ICMP error on earlier request. */
633 error = svc_sendto(rqstp, &rqstp->rq_res);
634
635 return error;
636 }
637
638 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
639 {
640 }
641
642 static int svc_udp_has_wspace(struct svc_xprt *xprt)
643 {
644 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
645 struct svc_serv *serv = xprt->xpt_server;
646 unsigned long required;
647
648 /*
649 * Set the SOCK_NOSPACE flag before checking the available
650 * sock space.
651 */
652 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
653 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
654 if (required*2 > sock_wspace(svsk->sk_sk))
655 return 0;
656 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
657 return 1;
658 }
659
660 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
661 {
662 BUG();
663 return NULL;
664 }
665
666 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
667 struct sockaddr *sa, int salen,
668 int flags)
669 {
670 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
671 }
672
673 static struct svc_xprt_ops svc_udp_ops = {
674 .xpo_create = svc_udp_create,
675 .xpo_recvfrom = svc_udp_recvfrom,
676 .xpo_sendto = svc_udp_sendto,
677 .xpo_release_rqst = svc_release_skb,
678 .xpo_detach = svc_sock_detach,
679 .xpo_free = svc_sock_free,
680 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
681 .xpo_has_wspace = svc_udp_has_wspace,
682 .xpo_accept = svc_udp_accept,
683 };
684
685 static struct svc_xprt_class svc_udp_class = {
686 .xcl_name = "udp",
687 .xcl_owner = THIS_MODULE,
688 .xcl_ops = &svc_udp_ops,
689 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
690 };
691
692 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
693 {
694 int err, level, optname, one = 1;
695
696 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
697 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
698 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
699 svsk->sk_sk->sk_write_space = svc_write_space;
700
701 /* initialise setting must have enough space to
702 * receive and respond to one request.
703 * svc_udp_recvfrom will re-adjust if necessary
704 */
705 svc_sock_setbufsize(svsk->sk_sock,
706 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
707 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
708
709 /* data might have come in before data_ready set up */
710 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
711 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
712
713 /* make sure we get destination address info */
714 switch (svsk->sk_sk->sk_family) {
715 case AF_INET:
716 level = SOL_IP;
717 optname = IP_PKTINFO;
718 break;
719 case AF_INET6:
720 level = SOL_IPV6;
721 optname = IPV6_RECVPKTINFO;
722 break;
723 default:
724 BUG();
725 }
726 err = kernel_setsockopt(svsk->sk_sock, level, optname,
727 (char *)&one, sizeof(one));
728 dprintk("svc: kernel_setsockopt returned %d\n", err);
729 }
730
731 /*
732 * A data_ready event on a listening socket means there's a connection
733 * pending. Do not use state_change as a substitute for it.
734 */
735 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
736 {
737 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
738
739 dprintk("svc: socket %p TCP (listen) state change %d\n",
740 sk, sk->sk_state);
741
742 /*
743 * This callback may called twice when a new connection
744 * is established as a child socket inherits everything
745 * from a parent LISTEN socket.
746 * 1) data_ready method of the parent socket will be called
747 * when one of child sockets become ESTABLISHED.
748 * 2) data_ready method of the child socket may be called
749 * when it receives data before the socket is accepted.
750 * In case of 2, we should ignore it silently.
751 */
752 if (sk->sk_state == TCP_LISTEN) {
753 if (svsk) {
754 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
755 svc_xprt_enqueue(&svsk->sk_xprt);
756 } else
757 printk("svc: socket %p: no user data\n", sk);
758 }
759
760 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
761 wake_up_interruptible_all(sk->sk_sleep);
762 }
763
764 /*
765 * A state change on a connected socket means it's dying or dead.
766 */
767 static void svc_tcp_state_change(struct sock *sk)
768 {
769 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
770
771 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
772 sk, sk->sk_state, sk->sk_user_data);
773
774 if (!svsk)
775 printk("svc: socket %p: no user data\n", sk);
776 else {
777 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
778 svc_xprt_enqueue(&svsk->sk_xprt);
779 }
780 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
781 wake_up_interruptible_all(sk->sk_sleep);
782 }
783
784 static void svc_tcp_data_ready(struct sock *sk, int count)
785 {
786 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
787
788 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
789 sk, sk->sk_user_data);
790 if (svsk) {
791 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
792 svc_xprt_enqueue(&svsk->sk_xprt);
793 }
794 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
795 wake_up_interruptible(sk->sk_sleep);
796 }
797
798 /*
799 * Accept a TCP connection
800 */
801 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
802 {
803 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
804 struct sockaddr_storage addr;
805 struct sockaddr *sin = (struct sockaddr *) &addr;
806 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
807 struct socket *sock = svsk->sk_sock;
808 struct socket *newsock;
809 struct svc_sock *newsvsk;
810 int err, slen;
811 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
812
813 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
814 if (!sock)
815 return NULL;
816
817 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
818 err = kernel_accept(sock, &newsock, O_NONBLOCK);
819 if (err < 0) {
820 if (err == -ENOMEM)
821 printk(KERN_WARNING "%s: no more sockets!\n",
822 serv->sv_name);
823 else if (err != -EAGAIN && net_ratelimit())
824 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
825 serv->sv_name, -err);
826 return NULL;
827 }
828 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
829
830 err = kernel_getpeername(newsock, sin, &slen);
831 if (err < 0) {
832 if (net_ratelimit())
833 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
834 serv->sv_name, -err);
835 goto failed; /* aborted connection or whatever */
836 }
837
838 /* Ideally, we would want to reject connections from unauthorized
839 * hosts here, but when we get encryption, the IP of the host won't
840 * tell us anything. For now just warn about unpriv connections.
841 */
842 if (!svc_port_is_privileged(sin)) {
843 dprintk(KERN_WARNING
844 "%s: connect from unprivileged port: %s\n",
845 serv->sv_name,
846 __svc_print_addr(sin, buf, sizeof(buf)));
847 }
848 dprintk("%s: connect from %s\n", serv->sv_name,
849 __svc_print_addr(sin, buf, sizeof(buf)));
850
851 /* make sure that a write doesn't block forever when
852 * low on memory
853 */
854 newsock->sk->sk_sndtimeo = HZ*30;
855
856 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
857 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
858 goto failed;
859 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
860 err = kernel_getsockname(newsock, sin, &slen);
861 if (unlikely(err < 0)) {
862 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
863 slen = offsetof(struct sockaddr, sa_data);
864 }
865 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
866
867 if (serv->sv_stats)
868 serv->sv_stats->nettcpconn++;
869
870 return &newsvsk->sk_xprt;
871
872 failed:
873 sock_release(newsock);
874 return NULL;
875 }
876
877 /*
878 * Receive data.
879 * If we haven't gotten the record length yet, get the next four bytes.
880 * Otherwise try to gobble up as much as possible up to the complete
881 * record length.
882 */
883 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
884 {
885 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
886 int len;
887
888 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
889 /* sndbuf needs to have room for one request
890 * per thread, otherwise we can stall even when the
891 * network isn't a bottleneck.
892 *
893 * We count all threads rather than threads in a
894 * particular pool, which provides an upper bound
895 * on the number of threads which will access the socket.
896 *
897 * rcvbuf just needs to be able to hold a few requests.
898 * Normally they will be removed from the queue
899 * as soon a a complete request arrives.
900 */
901 svc_sock_setbufsize(svsk->sk_sock,
902 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
903 3 * serv->sv_max_mesg);
904
905 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
906
907 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
908 int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
909 struct kvec iov;
910
911 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
912 iov.iov_len = want;
913 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
914 goto error;
915 svsk->sk_tcplen += len;
916
917 if (len < want) {
918 dprintk("svc: short recvfrom while reading record "
919 "length (%d of %d)\n", len, want);
920 svc_xprt_received(&svsk->sk_xprt);
921 goto err_again; /* record header not complete */
922 }
923
924 svsk->sk_reclen = ntohl(svsk->sk_reclen);
925 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
926 /* FIXME: technically, a record can be fragmented,
927 * and non-terminal fragments will not have the top
928 * bit set in the fragment length header.
929 * But apparently no known nfs clients send fragmented
930 * records. */
931 if (net_ratelimit())
932 printk(KERN_NOTICE "RPC: multiple fragments "
933 "per record not supported\n");
934 goto err_delete;
935 }
936
937 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
938 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
939 if (svsk->sk_reclen > serv->sv_max_mesg) {
940 if (net_ratelimit())
941 printk(KERN_NOTICE "RPC: "
942 "fragment too large: 0x%08lx\n",
943 (unsigned long)svsk->sk_reclen);
944 goto err_delete;
945 }
946 }
947
948 /* Check whether enough data is available */
949 len = svc_recv_available(svsk);
950 if (len < 0)
951 goto error;
952
953 if (len < svsk->sk_reclen) {
954 dprintk("svc: incomplete TCP record (%d of %d)\n",
955 len, svsk->sk_reclen);
956 svc_xprt_received(&svsk->sk_xprt);
957 goto err_again; /* record not complete */
958 }
959 len = svsk->sk_reclen;
960 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
961
962 return len;
963 error:
964 if (len == -EAGAIN) {
965 dprintk("RPC: TCP recv_record got EAGAIN\n");
966 svc_xprt_received(&svsk->sk_xprt);
967 }
968 return len;
969 err_delete:
970 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
971 err_again:
972 return -EAGAIN;
973 }
974
975 static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
976 struct rpc_rqst **reqpp, struct kvec *vec)
977 {
978 struct rpc_rqst *req = NULL;
979 u32 *p;
980 u32 xid;
981 u32 calldir;
982 int len;
983
984 len = svc_recvfrom(rqstp, vec, 1, 8);
985 if (len < 0)
986 goto error;
987
988 p = (u32 *)rqstp->rq_arg.head[0].iov_base;
989 xid = *p++;
990 calldir = *p;
991
992 if (calldir == 0) {
993 /* REQUEST is the most common case */
994 vec[0] = rqstp->rq_arg.head[0];
995 } else {
996 /* REPLY */
997 if (svsk->sk_bc_xprt)
998 req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
999
1000 if (!req) {
1001 printk(KERN_NOTICE
1002 "%s: Got unrecognized reply: "
1003 "calldir 0x%x sk_bc_xprt %p xid %08x\n",
1004 __func__, ntohl(calldir),
1005 svsk->sk_bc_xprt, xid);
1006 vec[0] = rqstp->rq_arg.head[0];
1007 goto out;
1008 }
1009
1010 memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
1011 sizeof(struct xdr_buf));
1012 /* copy the xid and call direction */
1013 memcpy(req->rq_private_buf.head[0].iov_base,
1014 rqstp->rq_arg.head[0].iov_base, 8);
1015 vec[0] = req->rq_private_buf.head[0];
1016 }
1017 out:
1018 vec[0].iov_base += 8;
1019 vec[0].iov_len -= 8;
1020 len = svsk->sk_reclen - 8;
1021 error:
1022 *reqpp = req;
1023 return len;
1024 }
1025
1026 /*
1027 * Receive data from a TCP socket.
1028 */
1029 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1030 {
1031 struct svc_sock *svsk =
1032 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1033 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1034 int len;
1035 struct kvec *vec;
1036 int pnum, vlen;
1037 struct rpc_rqst *req = NULL;
1038
1039 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1040 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1041 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1042 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1043
1044 len = svc_tcp_recv_record(svsk, rqstp);
1045 if (len < 0)
1046 goto error;
1047
1048 vec = rqstp->rq_vec;
1049 vec[0] = rqstp->rq_arg.head[0];
1050 vlen = PAGE_SIZE;
1051
1052 /*
1053 * We have enough data for the whole tcp record. Let's try and read the
1054 * first 8 bytes to get the xid and the call direction. We can use this
1055 * to figure out if this is a call or a reply to a callback. If
1056 * sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
1057 * In that case, don't bother with the calldir and just read the data.
1058 * It will be rejected in svc_process.
1059 */
1060 if (len >= 8) {
1061 len = svc_process_calldir(svsk, rqstp, &req, vec);
1062 if (len < 0)
1063 goto err_again;
1064 vlen -= 8;
1065 }
1066
1067 pnum = 1;
1068 while (vlen < len) {
1069 vec[pnum].iov_base = (req) ?
1070 page_address(req->rq_private_buf.pages[pnum - 1]) :
1071 page_address(rqstp->rq_pages[pnum]);
1072 vec[pnum].iov_len = PAGE_SIZE;
1073 pnum++;
1074 vlen += PAGE_SIZE;
1075 }
1076 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1077
1078 /* Now receive data */
1079 len = svc_recvfrom(rqstp, vec, pnum, len);
1080 if (len < 0)
1081 goto err_again;
1082
1083 /*
1084 * Account for the 8 bytes we read earlier
1085 */
1086 len += 8;
1087
1088 if (req) {
1089 xprt_complete_rqst(req->rq_task, len);
1090 len = 0;
1091 goto out;
1092 }
1093 dprintk("svc: TCP complete record (%d bytes)\n", len);
1094 rqstp->rq_arg.len = len;
1095 rqstp->rq_arg.page_base = 0;
1096 if (len <= rqstp->rq_arg.head[0].iov_len) {
1097 rqstp->rq_arg.head[0].iov_len = len;
1098 rqstp->rq_arg.page_len = 0;
1099 } else {
1100 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
1101 }
1102
1103 rqstp->rq_xprt_ctxt = NULL;
1104 rqstp->rq_prot = IPPROTO_TCP;
1105
1106 out:
1107 /* Reset TCP read info */
1108 svsk->sk_reclen = 0;
1109 svsk->sk_tcplen = 0;
1110
1111 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1112 svc_xprt_received(&svsk->sk_xprt);
1113 if (serv->sv_stats)
1114 serv->sv_stats->nettcpcnt++;
1115
1116 return len;
1117
1118 err_again:
1119 if (len == -EAGAIN) {
1120 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1121 svc_xprt_received(&svsk->sk_xprt);
1122 return len;
1123 }
1124 error:
1125 if (len != -EAGAIN) {
1126 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1127 svsk->sk_xprt.xpt_server->sv_name, -len);
1128 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1129 }
1130 return -EAGAIN;
1131 }
1132
1133 /*
1134 * Send out data on TCP socket.
1135 */
1136 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1137 {
1138 struct xdr_buf *xbufp = &rqstp->rq_res;
1139 int sent;
1140 __be32 reclen;
1141
1142 /* Set up the first element of the reply kvec.
1143 * Any other kvecs that may be in use have been taken
1144 * care of by the server implementation itself.
1145 */
1146 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1147 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1148
1149 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
1150 return -ENOTCONN;
1151
1152 sent = svc_sendto(rqstp, &rqstp->rq_res);
1153 if (sent != xbufp->len) {
1154 printk(KERN_NOTICE
1155 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1156 "- shutting down socket\n",
1157 rqstp->rq_xprt->xpt_server->sv_name,
1158 (sent<0)?"got error":"sent only",
1159 sent, xbufp->len);
1160 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1161 svc_xprt_enqueue(rqstp->rq_xprt);
1162 sent = -EAGAIN;
1163 }
1164 return sent;
1165 }
1166
1167 /*
1168 * Setup response header. TCP has a 4B record length field.
1169 */
1170 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1171 {
1172 struct kvec *resv = &rqstp->rq_res.head[0];
1173
1174 /* tcp needs a space for the record length... */
1175 svc_putnl(resv, 0);
1176 }
1177
1178 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1179 {
1180 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1181 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1182 int required;
1183
1184 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1185 return 1;
1186 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1187 if (sk_stream_wspace(svsk->sk_sk) >= required)
1188 return 1;
1189 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1190 return 0;
1191 }
1192
1193 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1194 struct sockaddr *sa, int salen,
1195 int flags)
1196 {
1197 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1198 }
1199
1200 static struct svc_xprt_ops svc_tcp_ops = {
1201 .xpo_create = svc_tcp_create,
1202 .xpo_recvfrom = svc_tcp_recvfrom,
1203 .xpo_sendto = svc_tcp_sendto,
1204 .xpo_release_rqst = svc_release_skb,
1205 .xpo_detach = svc_tcp_sock_detach,
1206 .xpo_free = svc_sock_free,
1207 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1208 .xpo_has_wspace = svc_tcp_has_wspace,
1209 .xpo_accept = svc_tcp_accept,
1210 };
1211
1212 static struct svc_xprt_class svc_tcp_class = {
1213 .xcl_name = "tcp",
1214 .xcl_owner = THIS_MODULE,
1215 .xcl_ops = &svc_tcp_ops,
1216 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1217 };
1218
1219 void svc_init_xprt_sock(void)
1220 {
1221 svc_reg_xprt_class(&svc_tcp_class);
1222 svc_reg_xprt_class(&svc_udp_class);
1223 }
1224
1225 void svc_cleanup_xprt_sock(void)
1226 {
1227 svc_unreg_xprt_class(&svc_tcp_class);
1228 svc_unreg_xprt_class(&svc_udp_class);
1229 }
1230
1231 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1232 {
1233 struct sock *sk = svsk->sk_sk;
1234
1235 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
1236 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1237 if (sk->sk_state == TCP_LISTEN) {
1238 dprintk("setting up TCP socket for listening\n");
1239 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1240 sk->sk_data_ready = svc_tcp_listen_data_ready;
1241 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1242 } else {
1243 dprintk("setting up TCP socket for reading\n");
1244 sk->sk_state_change = svc_tcp_state_change;
1245 sk->sk_data_ready = svc_tcp_data_ready;
1246 sk->sk_write_space = svc_tcp_write_space;
1247
1248 svsk->sk_reclen = 0;
1249 svsk->sk_tcplen = 0;
1250
1251 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1252
1253 /* initialise setting must have enough space to
1254 * receive and respond to one request.
1255 * svc_tcp_recvfrom will re-adjust if necessary
1256 */
1257 svc_sock_setbufsize(svsk->sk_sock,
1258 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1259 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1260
1261 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1262 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1263 if (sk->sk_state != TCP_ESTABLISHED)
1264 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1265 }
1266 }
1267
1268 void svc_sock_update_bufs(struct svc_serv *serv)
1269 {
1270 /*
1271 * The number of server threads has changed. Update
1272 * rcvbuf and sndbuf accordingly on all sockets
1273 */
1274 struct list_head *le;
1275
1276 spin_lock_bh(&serv->sv_lock);
1277 list_for_each(le, &serv->sv_permsocks) {
1278 struct svc_sock *svsk =
1279 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1280 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1281 }
1282 list_for_each(le, &serv->sv_tempsocks) {
1283 struct svc_sock *svsk =
1284 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1285 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1286 }
1287 spin_unlock_bh(&serv->sv_lock);
1288 }
1289 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1290
1291 /*
1292 * Initialize socket for RPC use and create svc_sock struct
1293 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1294 */
1295 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1296 struct socket *sock,
1297 int *errp, int flags)
1298 {
1299 struct svc_sock *svsk;
1300 struct sock *inet;
1301 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1302
1303 dprintk("svc: svc_setup_socket %p\n", sock);
1304 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
1305 *errp = -ENOMEM;
1306 return NULL;
1307 }
1308
1309 inet = sock->sk;
1310
1311 /* Register socket with portmapper */
1312 if (*errp >= 0 && pmap_register)
1313 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
1314 ntohs(inet_sk(inet)->sport));
1315
1316 if (*errp < 0) {
1317 kfree(svsk);
1318 return NULL;
1319 }
1320
1321 inet->sk_user_data = svsk;
1322 svsk->sk_sock = sock;
1323 svsk->sk_sk = inet;
1324 svsk->sk_ostate = inet->sk_state_change;
1325 svsk->sk_odata = inet->sk_data_ready;
1326 svsk->sk_owspace = inet->sk_write_space;
1327
1328 /* Initialize the socket */
1329 if (sock->type == SOCK_DGRAM)
1330 svc_udp_init(svsk, serv);
1331 else
1332 svc_tcp_init(svsk, serv);
1333
1334 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1335 svsk, svsk->sk_sk);
1336
1337 return svsk;
1338 }
1339
1340 /**
1341 * svc_addsock - add a listener socket to an RPC service
1342 * @serv: pointer to RPC service to which to add a new listener
1343 * @fd: file descriptor of the new listener
1344 * @name_return: pointer to buffer to fill in with name of listener
1345 * @len: size of the buffer
1346 *
1347 * Fills in socket name and returns positive length of name if successful.
1348 * Name is terminated with '\n'. On error, returns a negative errno
1349 * value.
1350 */
1351 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1352 const size_t len)
1353 {
1354 int err = 0;
1355 struct socket *so = sockfd_lookup(fd, &err);
1356 struct svc_sock *svsk = NULL;
1357
1358 if (!so)
1359 return err;
1360 if (so->sk->sk_family != AF_INET)
1361 err = -EAFNOSUPPORT;
1362 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1363 so->sk->sk_protocol != IPPROTO_UDP)
1364 err = -EPROTONOSUPPORT;
1365 else if (so->state > SS_UNCONNECTED)
1366 err = -EISCONN;
1367 else {
1368 if (!try_module_get(THIS_MODULE))
1369 err = -ENOENT;
1370 else
1371 svsk = svc_setup_socket(serv, so, &err,
1372 SVC_SOCK_DEFAULTS);
1373 if (svsk) {
1374 struct sockaddr_storage addr;
1375 struct sockaddr *sin = (struct sockaddr *)&addr;
1376 int salen;
1377 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1378 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1379 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1380 spin_lock_bh(&serv->sv_lock);
1381 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1382 spin_unlock_bh(&serv->sv_lock);
1383 svc_xprt_received(&svsk->sk_xprt);
1384 err = 0;
1385 } else
1386 module_put(THIS_MODULE);
1387 }
1388 if (err) {
1389 sockfd_put(so);
1390 return err;
1391 }
1392 return svc_one_sock_name(svsk, name_return, len);
1393 }
1394 EXPORT_SYMBOL_GPL(svc_addsock);
1395
1396 /*
1397 * Create socket for RPC service.
1398 */
1399 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1400 int protocol,
1401 struct sockaddr *sin, int len,
1402 int flags)
1403 {
1404 struct svc_sock *svsk;
1405 struct socket *sock;
1406 int error;
1407 int type;
1408 struct sockaddr_storage addr;
1409 struct sockaddr *newsin = (struct sockaddr *)&addr;
1410 int newlen;
1411 int family;
1412 int val;
1413 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1414
1415 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1416 serv->sv_program->pg_name, protocol,
1417 __svc_print_addr(sin, buf, sizeof(buf)));
1418
1419 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1420 printk(KERN_WARNING "svc: only UDP and TCP "
1421 "sockets supported\n");
1422 return ERR_PTR(-EINVAL);
1423 }
1424
1425 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1426 switch (sin->sa_family) {
1427 case AF_INET6:
1428 family = PF_INET6;
1429 break;
1430 case AF_INET:
1431 family = PF_INET;
1432 break;
1433 default:
1434 return ERR_PTR(-EINVAL);
1435 }
1436
1437 error = sock_create_kern(family, type, protocol, &sock);
1438 if (error < 0)
1439 return ERR_PTR(error);
1440
1441 svc_reclassify_socket(sock);
1442
1443 /*
1444 * If this is an PF_INET6 listener, we want to avoid
1445 * getting requests from IPv4 remotes. Those should
1446 * be shunted to a PF_INET listener via rpcbind.
1447 */
1448 val = 1;
1449 if (family == PF_INET6)
1450 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1451 (char *)&val, sizeof(val));
1452
1453 if (type == SOCK_STREAM)
1454 sock->sk->sk_reuse = 1; /* allow address reuse */
1455 error = kernel_bind(sock, sin, len);
1456 if (error < 0)
1457 goto bummer;
1458
1459 newlen = len;
1460 error = kernel_getsockname(sock, newsin, &newlen);
1461 if (error < 0)
1462 goto bummer;
1463
1464 if (protocol == IPPROTO_TCP) {
1465 if ((error = kernel_listen(sock, 64)) < 0)
1466 goto bummer;
1467 }
1468
1469 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
1470 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1471 return (struct svc_xprt *)svsk;
1472 }
1473
1474 bummer:
1475 dprintk("svc: svc_create_socket error = %d\n", -error);
1476 sock_release(sock);
1477 return ERR_PTR(error);
1478 }
1479
1480 /*
1481 * Detach the svc_sock from the socket so that no
1482 * more callbacks occur.
1483 */
1484 static void svc_sock_detach(struct svc_xprt *xprt)
1485 {
1486 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1487 struct sock *sk = svsk->sk_sk;
1488
1489 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1490
1491 /* put back the old socket callbacks */
1492 sk->sk_state_change = svsk->sk_ostate;
1493 sk->sk_data_ready = svsk->sk_odata;
1494 sk->sk_write_space = svsk->sk_owspace;
1495
1496 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1497 wake_up_interruptible(sk->sk_sleep);
1498 }
1499
1500 /*
1501 * Disconnect the socket, and reset the callbacks
1502 */
1503 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1504 {
1505 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1506
1507 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1508
1509 svc_sock_detach(xprt);
1510
1511 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
1512 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1513 }
1514
1515 /*
1516 * Free the svc_sock's socket resources and the svc_sock itself.
1517 */
1518 static void svc_sock_free(struct svc_xprt *xprt)
1519 {
1520 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1521 dprintk("svc: svc_sock_free(%p)\n", svsk);
1522
1523 if (svsk->sk_sock->file)
1524 sockfd_put(svsk->sk_sock);
1525 else
1526 sock_release(svsk->sk_sock);
1527 kfree(svsk);
1528 }
1529
1530 /*
1531 * Create a svc_xprt.
1532 *
1533 * For internal use only (e.g. nfsv4.1 backchannel).
1534 * Callers should typically use the xpo_create() method.
1535 */
1536 struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
1537 {
1538 struct svc_sock *svsk;
1539 struct svc_xprt *xprt = NULL;
1540
1541 dprintk("svc: %s\n", __func__);
1542 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1543 if (!svsk)
1544 goto out;
1545
1546 xprt = &svsk->sk_xprt;
1547 if (prot == IPPROTO_TCP)
1548 svc_xprt_init(&svc_tcp_class, xprt, serv);
1549 else if (prot == IPPROTO_UDP)
1550 svc_xprt_init(&svc_udp_class, xprt, serv);
1551 else
1552 BUG();
1553 out:
1554 dprintk("svc: %s return %p\n", __func__, xprt);
1555 return xprt;
1556 }
1557 EXPORT_SYMBOL_GPL(svc_sock_create);
1558
1559 /*
1560 * Destroy a svc_sock.
1561 */
1562 void svc_sock_destroy(struct svc_xprt *xprt)
1563 {
1564 if (xprt)
1565 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1566 }
1567 EXPORT_SYMBOL_GPL(svc_sock_destroy);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree