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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / sunrpc / svcsock.c
blob7e534dd0907720073171365cc218b25e012b4c0c
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_locked(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 }
154
155 /*
156 * send routine intended to be shared by the fore- and back-channel
157 */
158 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
159 struct page *headpage, unsigned long headoffset,
160 struct page *tailpage, unsigned long tailoffset)
161 {
162 int result;
163 int size;
164 struct page **ppage = xdr->pages;
165 size_t base = xdr->page_base;
166 unsigned int pglen = xdr->page_len;
167 unsigned int flags = MSG_MORE;
168 int slen;
169 int len = 0;
170
171 slen = xdr->len;
172
173 /* send head */
174 if (slen == xdr->head[0].iov_len)
175 flags = 0;
176 len = kernel_sendpage(sock, headpage, headoffset,
177 xdr->head[0].iov_len, flags);
178 if (len != xdr->head[0].iov_len)
179 goto out;
180 slen -= xdr->head[0].iov_len;
181 if (slen == 0)
182 goto out;
183
184 /* send page data */
185 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
186 while (pglen > 0) {
187 if (slen == size)
188 flags = 0;
189 result = kernel_sendpage(sock, *ppage, base, size, flags);
190 if (result > 0)
191 len += result;
192 if (result != size)
193 goto out;
194 slen -= size;
195 pglen -= size;
196 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
197 base = 0;
198 ppage++;
199 }
200
201 /* send tail */
202 if (xdr->tail[0].iov_len) {
203 result = kernel_sendpage(sock, tailpage, tailoffset,
204 xdr->tail[0].iov_len, 0);
205 if (result > 0)
206 len += result;
207 }
208
209 out:
210 return len;
211 }
212
213
214 /*
215 * Generic sendto routine
216 */
217 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
218 {
219 struct svc_sock *svsk =
220 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
221 struct socket *sock = svsk->sk_sock;
222 union {
223 struct cmsghdr hdr;
224 long all[SVC_PKTINFO_SPACE / sizeof(long)];
225 } buffer;
226 struct cmsghdr *cmh = &buffer.hdr;
227 int len = 0;
228 unsigned long tailoff;
229 unsigned long headoff;
230 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
231
232 if (rqstp->rq_prot == IPPROTO_UDP) {
233 struct msghdr msg = {
234 .msg_name = &rqstp->rq_addr,
235 .msg_namelen = rqstp->rq_addrlen,
236 .msg_control = cmh,
237 .msg_controllen = sizeof(buffer),
238 .msg_flags = MSG_MORE,
239 };
240
241 svc_set_cmsg_data(rqstp, cmh);
242
243 if (sock_sendmsg(sock, &msg, 0) < 0)
244 goto out;
245 }
246
247 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
248 headoff = 0;
249 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
250 rqstp->rq_respages[0], tailoff);
251
252 out:
253 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
254 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
255 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
256
257 return len;
258 }
259
260 /*
261 * Report socket names for nfsdfs
262 */
263 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
264 {
265 const struct sock *sk = svsk->sk_sk;
266 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
267 "udp" : "tcp";
268 int len;
269
270 switch (sk->sk_family) {
271 case PF_INET:
272 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
273 proto_name,
274 &inet_sk(sk)->inet_rcv_saddr,
275 inet_sk(sk)->inet_num);
276 break;
277 case PF_INET6:
278 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
279 proto_name,
280 &inet6_sk(sk)->rcv_saddr,
281 inet_sk(sk)->inet_num);
282 break;
283 default:
284 len = snprintf(buf, remaining, "*unknown-%d*\n",
285 sk->sk_family);
286 }
287
288 if (len >= remaining) {
289 *buf = '\0';
290 return -ENAMETOOLONG;
291 }
292 return len;
293 }
294
295 /**
296 * svc_sock_names - construct a list of listener names in a string
297 * @serv: pointer to RPC service
298 * @buf: pointer to a buffer to fill in with socket names
299 * @buflen: size of the buffer to be filled
300 * @toclose: pointer to '\0'-terminated C string containing the name
301 * of a listener to be closed
302 *
303 * Fills in @buf with a '\n'-separated list of names of listener
304 * sockets. If @toclose is not NULL, the socket named by @toclose
305 * is closed, and is not included in the output list.
306 *
307 * Returns positive length of the socket name string, or a negative
308 * errno value on error.
309 */
310 int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
311 const char *toclose)
312 {
313 struct svc_sock *svsk, *closesk = NULL;
314 int len = 0;
315
316 if (!serv)
317 return 0;
318
319 spin_lock_bh(&serv->sv_lock);
320 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
321 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
322 if (onelen < 0) {
323 len = onelen;
324 break;
325 }
326 if (toclose && strcmp(toclose, buf + len) == 0)
327 closesk = svsk;
328 else
329 len += onelen;
330 }
331 spin_unlock_bh(&serv->sv_lock);
332
333 if (closesk)
334 /* Should unregister with portmap, but you cannot
335 * unregister just one protocol...
336 */
337 svc_close_xprt(&closesk->sk_xprt);
338 else if (toclose)
339 return -ENOENT;
340 return len;
341 }
342 EXPORT_SYMBOL_GPL(svc_sock_names);
343
344 /*
345 * Check input queue length
346 */
347 static int svc_recv_available(struct svc_sock *svsk)
348 {
349 struct socket *sock = svsk->sk_sock;
350 int avail, err;
351
352 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
353
354 return (err >= 0)? avail : err;
355 }
356
357 /*
358 * Generic recvfrom routine.
359 */
360 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
361 int buflen)
362 {
363 struct svc_sock *svsk =
364 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
365 struct msghdr msg = {
366 .msg_flags = MSG_DONTWAIT,
367 };
368 int len;
369
370 rqstp->rq_xprt_hlen = 0;
371
372 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
373 msg.msg_flags);
374
375 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
376 svsk, iov[0].iov_base, iov[0].iov_len, len);
377 return len;
378 }
379
380 /*
381 * Set socket snd and rcv buffer lengths
382 */
383 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
384 unsigned int rcv)
385 {
386 #if 0
387 mm_segment_t oldfs;
388 oldfs = get_fs(); set_fs(KERNEL_DS);
389 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
390 (char*)&snd, sizeof(snd));
391 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
392 (char*)&rcv, sizeof(rcv));
393 #else
394 /* sock_setsockopt limits use to sysctl_?mem_max,
395 * which isn't acceptable. Until that is made conditional
396 * on not having CAP_SYS_RESOURCE or similar, we go direct...
397 * DaveM said I could!
398 */
399 lock_sock(sock->sk);
400 sock->sk->sk_sndbuf = snd * 2;
401 sock->sk->sk_rcvbuf = rcv * 2;
402 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
403 sock->sk->sk_write_space(sock->sk);
404 release_sock(sock->sk);
405 #endif
406 }
407 /*
408 * INET callback when data has been received on the socket.
409 */
410 static void svc_udp_data_ready(struct sock *sk, int count)
411 {
412 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
413
414 if (svsk) {
415 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
416 svsk, sk, count,
417 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
418 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
419 svc_xprt_enqueue(&svsk->sk_xprt);
420 }
421 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
422 wake_up_interruptible(sk_sleep(sk));
423 }
424
425 /*
426 * INET callback when space is newly available on the socket.
427 */
428 static void svc_write_space(struct sock *sk)
429 {
430 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
431
432 if (svsk) {
433 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
434 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
435 svc_xprt_enqueue(&svsk->sk_xprt);
436 }
437
438 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) {
439 dprintk("RPC svc_write_space: someone sleeping on %p\n",
440 svsk);
441 wake_up_interruptible(sk_sleep(sk));
442 }
443 }
444
445 static void svc_tcp_write_space(struct sock *sk)
446 {
447 struct socket *sock = sk->sk_socket;
448
449 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
450 clear_bit(SOCK_NOSPACE, &sock->flags);
451 svc_write_space(sk);
452 }
453
454 /*
455 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
456 */
457 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
458 struct cmsghdr *cmh)
459 {
460 struct in_pktinfo *pki = CMSG_DATA(cmh);
461 if (cmh->cmsg_type != IP_PKTINFO)
462 return 0;
463 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
464 return 1;
465 }
466
467 /*
468 * See net/ipv6/datagram.c : datagram_recv_ctl
469 */
470 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
471 struct cmsghdr *cmh)
472 {
473 struct in6_pktinfo *pki = CMSG_DATA(cmh);
474 if (cmh->cmsg_type != IPV6_PKTINFO)
475 return 0;
476 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
477 return 1;
478 }
479
480 /*
481 * Copy the UDP datagram's destination address to the rqstp structure.
482 * The 'destination' address in this case is the address to which the
483 * peer sent the datagram, i.e. our local address. For multihomed
484 * hosts, this can change from msg to msg. Note that only the IP
485 * address changes, the port number should remain the same.
486 */
487 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
488 struct cmsghdr *cmh)
489 {
490 switch (cmh->cmsg_level) {
491 case SOL_IP:
492 return svc_udp_get_dest_address4(rqstp, cmh);
493 case SOL_IPV6:
494 return svc_udp_get_dest_address6(rqstp, cmh);
495 }
496
497 return 0;
498 }
499
500 /*
501 * Receive a datagram from a UDP socket.
502 */
503 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
504 {
505 struct svc_sock *svsk =
506 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
507 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
508 struct sk_buff *skb;
509 union {
510 struct cmsghdr hdr;
511 long all[SVC_PKTINFO_SPACE / sizeof(long)];
512 } buffer;
513 struct cmsghdr *cmh = &buffer.hdr;
514 struct msghdr msg = {
515 .msg_name = svc_addr(rqstp),
516 .msg_control = cmh,
517 .msg_controllen = sizeof(buffer),
518 .msg_flags = MSG_DONTWAIT,
519 };
520 size_t len;
521 int err;
522
523 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
524 /* udp sockets need large rcvbuf as all pending
525 * requests are still in that buffer. sndbuf must
526 * also be large enough that there is enough space
527 * for one reply per thread. We count all threads
528 * rather than threads in a particular pool, which
529 * provides an upper bound on the number of threads
530 * which will access the socket.
531 */
532 svc_sock_setbufsize(svsk->sk_sock,
533 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
534 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
535
536 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
537 skb = NULL;
538 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
539 0, 0, MSG_PEEK | MSG_DONTWAIT);
540 if (err >= 0)
541 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
542
543 if (skb == NULL) {
544 if (err != -EAGAIN) {
545 /* possibly an icmp error */
546 dprintk("svc: recvfrom returned error %d\n", -err);
547 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
548 }
549 return -EAGAIN;
550 }
551 len = svc_addr_len(svc_addr(rqstp));
552 if (len == 0)
553 return -EAFNOSUPPORT;
554 rqstp->rq_addrlen = len;
555 if (skb->tstamp.tv64 == 0) {
556 skb->tstamp = ktime_get_real();
557 /* Don't enable netstamp, sunrpc doesn't
558 need that much accuracy */
559 }
560 svsk->sk_sk->sk_stamp = skb->tstamp;
561 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
562
563 len = skb->len - sizeof(struct udphdr);
564 rqstp->rq_arg.len = len;
565
566 rqstp->rq_prot = IPPROTO_UDP;
567
568 if (!svc_udp_get_dest_address(rqstp, cmh)) {
569 if (net_ratelimit())
570 printk(KERN_WARNING
571 "svc: received unknown control message %d/%d; "
572 "dropping RPC reply datagram\n",
573 cmh->cmsg_level, cmh->cmsg_type);
574 skb_free_datagram_locked(svsk->sk_sk, skb);
575 return 0;
576 }
577
578 if (skb_is_nonlinear(skb)) {
579 /* we have to copy */
580 local_bh_disable();
581 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
582 local_bh_enable();
583 /* checksum error */
584 skb_free_datagram_locked(svsk->sk_sk, skb);
585 return 0;
586 }
587 local_bh_enable();
588 skb_free_datagram_locked(svsk->sk_sk, skb);
589 } else {
590 /* we can use it in-place */
591 rqstp->rq_arg.head[0].iov_base = skb->data +
592 sizeof(struct udphdr);
593 rqstp->rq_arg.head[0].iov_len = len;
594 if (skb_checksum_complete(skb)) {
595 skb_free_datagram_locked(svsk->sk_sk, skb);
596 return 0;
597 }
598 rqstp->rq_xprt_ctxt = skb;
599 }
600
601 rqstp->rq_arg.page_base = 0;
602 if (len <= rqstp->rq_arg.head[0].iov_len) {
603 rqstp->rq_arg.head[0].iov_len = len;
604 rqstp->rq_arg.page_len = 0;
605 rqstp->rq_respages = rqstp->rq_pages+1;
606 } else {
607 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
608 rqstp->rq_respages = rqstp->rq_pages + 1 +
609 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
610 }
611
612 if (serv->sv_stats)
613 serv->sv_stats->netudpcnt++;
614
615 return len;
616 }
617
618 static int
619 svc_udp_sendto(struct svc_rqst *rqstp)
620 {
621 int error;
622
623 error = svc_sendto(rqstp, &rqstp->rq_res);
624 if (error == -ECONNREFUSED)
625 /* ICMP error on earlier request. */
626 error = svc_sendto(rqstp, &rqstp->rq_res);
627
628 return error;
629 }
630
631 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
632 {
633 }
634
635 static int svc_udp_has_wspace(struct svc_xprt *xprt)
636 {
637 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
638 struct svc_serv *serv = xprt->xpt_server;
639 unsigned long required;
640
641 /*
642 * Set the SOCK_NOSPACE flag before checking the available
643 * sock space.
644 */
645 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
646 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
647 if (required*2 > sock_wspace(svsk->sk_sk))
648 return 0;
649 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
650 return 1;
651 }
652
653 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
654 {
655 BUG();
656 return NULL;
657 }
658
659 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
660 struct sockaddr *sa, int salen,
661 int flags)
662 {
663 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
664 }
665
666 static struct svc_xprt_ops svc_udp_ops = {
667 .xpo_create = svc_udp_create,
668 .xpo_recvfrom = svc_udp_recvfrom,
669 .xpo_sendto = svc_udp_sendto,
670 .xpo_release_rqst = svc_release_skb,
671 .xpo_detach = svc_sock_detach,
672 .xpo_free = svc_sock_free,
673 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
674 .xpo_has_wspace = svc_udp_has_wspace,
675 .xpo_accept = svc_udp_accept,
676 };
677
678 static struct svc_xprt_class svc_udp_class = {
679 .xcl_name = "udp",
680 .xcl_owner = THIS_MODULE,
681 .xcl_ops = &svc_udp_ops,
682 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
683 };
684
685 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
686 {
687 int err, level, optname, one = 1;
688
689 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
690 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
691 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
692 svsk->sk_sk->sk_write_space = svc_write_space;
693
694 /* initialise setting must have enough space to
695 * receive and respond to one request.
696 * svc_udp_recvfrom will re-adjust if necessary
697 */
698 svc_sock_setbufsize(svsk->sk_sock,
699 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
700 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
701
702 /* data might have come in before data_ready set up */
703 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
704 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
705
706 /* make sure we get destination address info */
707 switch (svsk->sk_sk->sk_family) {
708 case AF_INET:
709 level = SOL_IP;
710 optname = IP_PKTINFO;
711 break;
712 case AF_INET6:
713 level = SOL_IPV6;
714 optname = IPV6_RECVPKTINFO;
715 break;
716 default:
717 BUG();
718 }
719 err = kernel_setsockopt(svsk->sk_sock, level, optname,
720 (char *)&one, sizeof(one));
721 dprintk("svc: kernel_setsockopt returned %d\n", err);
722 }
723
724 /*
725 * A data_ready event on a listening socket means there's a connection
726 * pending. Do not use state_change as a substitute for it.
727 */
728 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
729 {
730 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
731
732 dprintk("svc: socket %p TCP (listen) state change %d\n",
733 sk, sk->sk_state);
734
735 /*
736 * This callback may called twice when a new connection
737 * is established as a child socket inherits everything
738 * from a parent LISTEN socket.
739 * 1) data_ready method of the parent socket will be called
740 * when one of child sockets become ESTABLISHED.
741 * 2) data_ready method of the child socket may be called
742 * when it receives data before the socket is accepted.
743 * In case of 2, we should ignore it silently.
744 */
745 if (sk->sk_state == TCP_LISTEN) {
746 if (svsk) {
747 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
748 svc_xprt_enqueue(&svsk->sk_xprt);
749 } else
750 printk("svc: socket %p: no user data\n", sk);
751 }
752
753 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
754 wake_up_interruptible_all(sk_sleep(sk));
755 }
756
757 /*
758 * A state change on a connected socket means it's dying or dead.
759 */
760 static void svc_tcp_state_change(struct sock *sk)
761 {
762 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
763
764 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
765 sk, sk->sk_state, sk->sk_user_data);
766
767 if (!svsk)
768 printk("svc: socket %p: no user data\n", sk);
769 else {
770 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
771 svc_xprt_enqueue(&svsk->sk_xprt);
772 }
773 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
774 wake_up_interruptible_all(sk_sleep(sk));
775 }
776
777 static void svc_tcp_data_ready(struct sock *sk, int count)
778 {
779 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
780
781 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
782 sk, sk->sk_user_data);
783 if (svsk) {
784 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
785 svc_xprt_enqueue(&svsk->sk_xprt);
786 }
787 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
788 wake_up_interruptible(sk_sleep(sk));
789 }
790
791 /*
792 * Accept a TCP connection
793 */
794 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
795 {
796 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
797 struct sockaddr_storage addr;
798 struct sockaddr *sin = (struct sockaddr *) &addr;
799 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
800 struct socket *sock = svsk->sk_sock;
801 struct socket *newsock;
802 struct svc_sock *newsvsk;
803 int err, slen;
804 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
805
806 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
807 if (!sock)
808 return NULL;
809
810 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
811 err = kernel_accept(sock, &newsock, O_NONBLOCK);
812 if (err < 0) {
813 if (err == -ENOMEM)
814 printk(KERN_WARNING "%s: no more sockets!\n",
815 serv->sv_name);
816 else if (err != -EAGAIN && net_ratelimit())
817 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
818 serv->sv_name, -err);
819 return NULL;
820 }
821 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
822
823 err = kernel_getpeername(newsock, sin, &slen);
824 if (err < 0) {
825 if (net_ratelimit())
826 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
827 serv->sv_name, -err);
828 goto failed; /* aborted connection or whatever */
829 }
830
831 /* Ideally, we would want to reject connections from unauthorized
832 * hosts here, but when we get encryption, the IP of the host won't
833 * tell us anything. For now just warn about unpriv connections.
834 */
835 if (!svc_port_is_privileged(sin)) {
836 dprintk(KERN_WARNING
837 "%s: connect from unprivileged port: %s\n",
838 serv->sv_name,
839 __svc_print_addr(sin, buf, sizeof(buf)));
840 }
841 dprintk("%s: connect from %s\n", serv->sv_name,
842 __svc_print_addr(sin, buf, sizeof(buf)));
843
844 /* make sure that a write doesn't block forever when
845 * low on memory
846 */
847 newsock->sk->sk_sndtimeo = HZ*30;
848
849 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
850 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
851 goto failed;
852 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
853 err = kernel_getsockname(newsock, sin, &slen);
854 if (unlikely(err < 0)) {
855 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
856 slen = offsetof(struct sockaddr, sa_data);
857 }
858 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
859
860 if (serv->sv_stats)
861 serv->sv_stats->nettcpconn++;
862
863 return &newsvsk->sk_xprt;
864
865 failed:
866 sock_release(newsock);
867 return NULL;
868 }
869
870 /*
871 * Receive data.
872 * If we haven't gotten the record length yet, get the next four bytes.
873 * Otherwise try to gobble up as much as possible up to the complete
874 * record length.
875 */
876 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
877 {
878 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
879 int len;
880
881 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
882 /* sndbuf needs to have room for one request
883 * per thread, otherwise we can stall even when the
884 * network isn't a bottleneck.
885 *
886 * We count all threads rather than threads in a
887 * particular pool, which provides an upper bound
888 * on the number of threads which will access the socket.
889 *
890 * rcvbuf just needs to be able to hold a few requests.
891 * Normally they will be removed from the queue
892 * as soon a a complete request arrives.
893 */
894 svc_sock_setbufsize(svsk->sk_sock,
895 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
896 3 * serv->sv_max_mesg);
897
898 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
899
900 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
901 int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
902 struct kvec iov;
903
904 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
905 iov.iov_len = want;
906 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
907 goto error;
908 svsk->sk_tcplen += len;
909
910 if (len < want) {
911 dprintk("svc: short recvfrom while reading record "
912 "length (%d of %d)\n", len, want);
913 goto err_again; /* record header not complete */
914 }
915
916 svsk->sk_reclen = ntohl(svsk->sk_reclen);
917 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
918 /* FIXME: technically, a record can be fragmented,
919 * and non-terminal fragments will not have the top
920 * bit set in the fragment length header.
921 * But apparently no known nfs clients send fragmented
922 * records. */
923 if (net_ratelimit())
924 printk(KERN_NOTICE "RPC: multiple fragments "
925 "per record not supported\n");
926 goto err_delete;
927 }
928
929 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
930 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
931 if (svsk->sk_reclen > serv->sv_max_mesg) {
932 if (net_ratelimit())
933 printk(KERN_NOTICE "RPC: "
934 "fragment too large: 0x%08lx\n",
935 (unsigned long)svsk->sk_reclen);
936 goto err_delete;
937 }
938 }
939
940 /* Check whether enough data is available */
941 len = svc_recv_available(svsk);
942 if (len < 0)
943 goto error;
944
945 if (len < svsk->sk_reclen) {
946 dprintk("svc: incomplete TCP record (%d of %d)\n",
947 len, svsk->sk_reclen);
948 goto err_again; /* record not complete */
949 }
950 len = svsk->sk_reclen;
951 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
952
953 return len;
954 error:
955 if (len == -EAGAIN)
956 dprintk("RPC: TCP recv_record got EAGAIN\n");
957 return len;
958 err_delete:
959 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
960 err_again:
961 return -EAGAIN;
962 }
963
964 static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
965 struct rpc_rqst **reqpp, struct kvec *vec)
966 {
967 struct rpc_rqst *req = NULL;
968 u32 *p;
969 u32 xid;
970 u32 calldir;
971 int len;
972
973 len = svc_recvfrom(rqstp, vec, 1, 8);
974 if (len < 0)
975 goto error;
976
977 p = (u32 *)rqstp->rq_arg.head[0].iov_base;
978 xid = *p++;
979 calldir = *p;
980
981 if (calldir == 0) {
982 /* REQUEST is the most common case */
983 vec[0] = rqstp->rq_arg.head[0];
984 } else {
985 /* REPLY */
986 if (svsk->sk_bc_xprt)
987 req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
988
989 if (!req) {
990 printk(KERN_NOTICE
991 "%s: Got unrecognized reply: "
992 "calldir 0x%x sk_bc_xprt %p xid %08x\n",
993 __func__, ntohl(calldir),
994 svsk->sk_bc_xprt, xid);
995 vec[0] = rqstp->rq_arg.head[0];
996 goto out;
997 }
998
999 memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
1000 sizeof(struct xdr_buf));
1001 /* copy the xid and call direction */
1002 memcpy(req->rq_private_buf.head[0].iov_base,
1003 rqstp->rq_arg.head[0].iov_base, 8);
1004 vec[0] = req->rq_private_buf.head[0];
1005 }
1006 out:
1007 vec[0].iov_base += 8;
1008 vec[0].iov_len -= 8;
1009 len = svsk->sk_reclen - 8;
1010 error:
1011 *reqpp = req;
1012 return len;
1013 }
1014
1015 /*
1016 * Receive data from a TCP socket.
1017 */
1018 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1019 {
1020 struct svc_sock *svsk =
1021 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1022 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1023 int len;
1024 struct kvec *vec;
1025 int pnum, vlen;
1026 struct rpc_rqst *req = NULL;
1027
1028 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1029 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1030 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1031 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1032
1033 len = svc_tcp_recv_record(svsk, rqstp);
1034 if (len < 0)
1035 goto error;
1036
1037 vec = rqstp->rq_vec;
1038 vec[0] = rqstp->rq_arg.head[0];
1039 vlen = PAGE_SIZE;
1040
1041 /*
1042 * We have enough data for the whole tcp record. Let's try and read the
1043 * first 8 bytes to get the xid and the call direction. We can use this
1044 * to figure out if this is a call or a reply to a callback. If
1045 * sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
1046 * In that case, don't bother with the calldir and just read the data.
1047 * It will be rejected in svc_process.
1048 */
1049 if (len >= 8) {
1050 len = svc_process_calldir(svsk, rqstp, &req, vec);
1051 if (len < 0)
1052 goto err_again;
1053 vlen -= 8;
1054 }
1055
1056 pnum = 1;
1057 while (vlen < len) {
1058 vec[pnum].iov_base = (req) ?
1059 page_address(req->rq_private_buf.pages[pnum - 1]) :
1060 page_address(rqstp->rq_pages[pnum]);
1061 vec[pnum].iov_len = PAGE_SIZE;
1062 pnum++;
1063 vlen += PAGE_SIZE;
1064 }
1065 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1066
1067 /* Now receive data */
1068 len = svc_recvfrom(rqstp, vec, pnum, len);
1069 if (len < 0)
1070 goto err_again;
1071
1072 /*
1073 * Account for the 8 bytes we read earlier
1074 */
1075 len += 8;
1076
1077 if (req) {
1078 xprt_complete_rqst(req->rq_task, len);
1079 len = 0;
1080 goto out;
1081 }
1082 dprintk("svc: TCP complete record (%d bytes)\n", len);
1083 rqstp->rq_arg.len = len;
1084 rqstp->rq_arg.page_base = 0;
1085 if (len <= rqstp->rq_arg.head[0].iov_len) {
1086 rqstp->rq_arg.head[0].iov_len = len;
1087 rqstp->rq_arg.page_len = 0;
1088 } else {
1089 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
1090 }
1091
1092 rqstp->rq_xprt_ctxt = NULL;
1093 rqstp->rq_prot = IPPROTO_TCP;
1094
1095 out:
1096 /* Reset TCP read info */
1097 svsk->sk_reclen = 0;
1098 svsk->sk_tcplen = 0;
1099
1100 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1101 if (serv->sv_stats)
1102 serv->sv_stats->nettcpcnt++;
1103
1104 return len;
1105
1106 err_again:
1107 if (len == -EAGAIN) {
1108 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1109 return len;
1110 }
1111 error:
1112 if (len != -EAGAIN) {
1113 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1114 svsk->sk_xprt.xpt_server->sv_name, -len);
1115 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1116 }
1117 return -EAGAIN;
1118 }
1119
1120 /*
1121 * Send out data on TCP socket.
1122 */
1123 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1124 {
1125 struct xdr_buf *xbufp = &rqstp->rq_res;
1126 int sent;
1127 __be32 reclen;
1128
1129 /* Set up the first element of the reply kvec.
1130 * Any other kvecs that may be in use have been taken
1131 * care of by the server implementation itself.
1132 */
1133 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1134 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1135
1136 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
1137 return -ENOTCONN;
1138
1139 sent = svc_sendto(rqstp, &rqstp->rq_res);
1140 if (sent != xbufp->len) {
1141 printk(KERN_NOTICE
1142 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1143 "- shutting down socket\n",
1144 rqstp->rq_xprt->xpt_server->sv_name,
1145 (sent<0)?"got error":"sent only",
1146 sent, xbufp->len);
1147 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1148 svc_xprt_enqueue(rqstp->rq_xprt);
1149 sent = -EAGAIN;
1150 }
1151 return sent;
1152 }
1153
1154 /*
1155 * Setup response header. TCP has a 4B record length field.
1156 */
1157 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1158 {
1159 struct kvec *resv = &rqstp->rq_res.head[0];
1160
1161 /* tcp needs a space for the record length... */
1162 svc_putnl(resv, 0);
1163 }
1164
1165 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1166 {
1167 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1168 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1169 int required;
1170
1171 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1172 return 1;
1173 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1174 if (sk_stream_wspace(svsk->sk_sk) >= required)
1175 return 1;
1176 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1177 return 0;
1178 }
1179
1180 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1181 struct sockaddr *sa, int salen,
1182 int flags)
1183 {
1184 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1185 }
1186
1187 static struct svc_xprt_ops svc_tcp_ops = {
1188 .xpo_create = svc_tcp_create,
1189 .xpo_recvfrom = svc_tcp_recvfrom,
1190 .xpo_sendto = svc_tcp_sendto,
1191 .xpo_release_rqst = svc_release_skb,
1192 .xpo_detach = svc_tcp_sock_detach,
1193 .xpo_free = svc_sock_free,
1194 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1195 .xpo_has_wspace = svc_tcp_has_wspace,
1196 .xpo_accept = svc_tcp_accept,
1197 };
1198
1199 static struct svc_xprt_class svc_tcp_class = {
1200 .xcl_name = "tcp",
1201 .xcl_owner = THIS_MODULE,
1202 .xcl_ops = &svc_tcp_ops,
1203 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1204 };
1205
1206 void svc_init_xprt_sock(void)
1207 {
1208 svc_reg_xprt_class(&svc_tcp_class);
1209 svc_reg_xprt_class(&svc_udp_class);
1210 }
1211
1212 void svc_cleanup_xprt_sock(void)
1213 {
1214 svc_unreg_xprt_class(&svc_tcp_class);
1215 svc_unreg_xprt_class(&svc_udp_class);
1216 }
1217
1218 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1219 {
1220 struct sock *sk = svsk->sk_sk;
1221
1222 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
1223 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1224 if (sk->sk_state == TCP_LISTEN) {
1225 dprintk("setting up TCP socket for listening\n");
1226 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1227 sk->sk_data_ready = svc_tcp_listen_data_ready;
1228 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1229 } else {
1230 dprintk("setting up TCP socket for reading\n");
1231 sk->sk_state_change = svc_tcp_state_change;
1232 sk->sk_data_ready = svc_tcp_data_ready;
1233 sk->sk_write_space = svc_tcp_write_space;
1234
1235 svsk->sk_reclen = 0;
1236 svsk->sk_tcplen = 0;
1237
1238 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1239
1240 /* initialise setting must have enough space to
1241 * receive and respond to one request.
1242 * svc_tcp_recvfrom will re-adjust if necessary
1243 */
1244 svc_sock_setbufsize(svsk->sk_sock,
1245 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1246 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1247
1248 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1249 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1250 if (sk->sk_state != TCP_ESTABLISHED)
1251 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1252 }
1253 }
1254
1255 void svc_sock_update_bufs(struct svc_serv *serv)
1256 {
1257 /*
1258 * The number of server threads has changed. Update
1259 * rcvbuf and sndbuf accordingly on all sockets
1260 */
1261 struct list_head *le;
1262
1263 spin_lock_bh(&serv->sv_lock);
1264 list_for_each(le, &serv->sv_permsocks) {
1265 struct svc_sock *svsk =
1266 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1267 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1268 }
1269 list_for_each(le, &serv->sv_tempsocks) {
1270 struct svc_sock *svsk =
1271 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
1272 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1273 }
1274 spin_unlock_bh(&serv->sv_lock);
1275 }
1276 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1277
1278 /*
1279 * Initialize socket for RPC use and create svc_sock struct
1280 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1281 */
1282 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1283 struct socket *sock,
1284 int *errp, int flags)
1285 {
1286 struct svc_sock *svsk;
1287 struct sock *inet;
1288 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1289
1290 dprintk("svc: svc_setup_socket %p\n", sock);
1291 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
1292 *errp = -ENOMEM;
1293 return NULL;
1294 }
1295
1296 inet = sock->sk;
1297
1298 /* Register socket with portmapper */
1299 if (*errp >= 0 && pmap_register)
1300 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
1301 ntohs(inet_sk(inet)->inet_sport));
1302
1303 if (*errp < 0) {
1304 kfree(svsk);
1305 return NULL;
1306 }
1307
1308 inet->sk_user_data = svsk;
1309 svsk->sk_sock = sock;
1310 svsk->sk_sk = inet;
1311 svsk->sk_ostate = inet->sk_state_change;
1312 svsk->sk_odata = inet->sk_data_ready;
1313 svsk->sk_owspace = inet->sk_write_space;
1314
1315 /* Initialize the socket */
1316 if (sock->type == SOCK_DGRAM)
1317 svc_udp_init(svsk, serv);
1318 else
1319 svc_tcp_init(svsk, serv);
1320
1321 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1322 svsk, svsk->sk_sk);
1323
1324 return svsk;
1325 }
1326
1327 /**
1328 * svc_addsock - add a listener socket to an RPC service
1329 * @serv: pointer to RPC service to which to add a new listener
1330 * @fd: file descriptor of the new listener
1331 * @name_return: pointer to buffer to fill in with name of listener
1332 * @len: size of the buffer
1333 *
1334 * Fills in socket name and returns positive length of name if successful.
1335 * Name is terminated with '\n'. On error, returns a negative errno
1336 * value.
1337 */
1338 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1339 const size_t len)
1340 {
1341 int err = 0;
1342 struct socket *so = sockfd_lookup(fd, &err);
1343 struct svc_sock *svsk = NULL;
1344
1345 if (!so)
1346 return err;
1347 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1348 err = -EAFNOSUPPORT;
1349 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1350 so->sk->sk_protocol != IPPROTO_UDP)
1351 err = -EPROTONOSUPPORT;
1352 else if (so->state > SS_UNCONNECTED)
1353 err = -EISCONN;
1354 else {
1355 if (!try_module_get(THIS_MODULE))
1356 err = -ENOENT;
1357 else
1358 svsk = svc_setup_socket(serv, so, &err,
1359 SVC_SOCK_DEFAULTS);
1360 if (svsk) {
1361 struct sockaddr_storage addr;
1362 struct sockaddr *sin = (struct sockaddr *)&addr;
1363 int salen;
1364 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1365 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1366 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1367 spin_lock_bh(&serv->sv_lock);
1368 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1369 spin_unlock_bh(&serv->sv_lock);
1370 svc_xprt_received(&svsk->sk_xprt);
1371 err = 0;
1372 } else
1373 module_put(THIS_MODULE);
1374 }
1375 if (err) {
1376 sockfd_put(so);
1377 return err;
1378 }
1379 return svc_one_sock_name(svsk, name_return, len);
1380 }
1381 EXPORT_SYMBOL_GPL(svc_addsock);
1382
1383 /*
1384 * Create socket for RPC service.
1385 */
1386 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1387 int protocol,
1388 struct sockaddr *sin, int len,
1389 int flags)
1390 {
1391 struct svc_sock *svsk;
1392 struct socket *sock;
1393 int error;
1394 int type;
1395 struct sockaddr_storage addr;
1396 struct sockaddr *newsin = (struct sockaddr *)&addr;
1397 int newlen;
1398 int family;
1399 int val;
1400 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1401
1402 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1403 serv->sv_program->pg_name, protocol,
1404 __svc_print_addr(sin, buf, sizeof(buf)));
1405
1406 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1407 printk(KERN_WARNING "svc: only UDP and TCP "
1408 "sockets supported\n");
1409 return ERR_PTR(-EINVAL);
1410 }
1411
1412 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1413 switch (sin->sa_family) {
1414 case AF_INET6:
1415 family = PF_INET6;
1416 break;
1417 case AF_INET:
1418 family = PF_INET;
1419 break;
1420 default:
1421 return ERR_PTR(-EINVAL);
1422 }
1423
1424 error = sock_create_kern(family, type, protocol, &sock);
1425 if (error < 0)
1426 return ERR_PTR(error);
1427
1428 svc_reclassify_socket(sock);
1429
1430 /*
1431 * If this is an PF_INET6 listener, we want to avoid
1432 * getting requests from IPv4 remotes. Those should
1433 * be shunted to a PF_INET listener via rpcbind.
1434 */
1435 val = 1;
1436 if (family == PF_INET6)
1437 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1438 (char *)&val, sizeof(val));
1439
1440 if (type == SOCK_STREAM)
1441 sock->sk->sk_reuse = 1; /* allow address reuse */
1442 error = kernel_bind(sock, sin, len);
1443 if (error < 0)
1444 goto bummer;
1445
1446 newlen = len;
1447 error = kernel_getsockname(sock, newsin, &newlen);
1448 if (error < 0)
1449 goto bummer;
1450
1451 if (protocol == IPPROTO_TCP) {
1452 if ((error = kernel_listen(sock, 64)) < 0)
1453 goto bummer;
1454 }
1455
1456 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
1457 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1458 return (struct svc_xprt *)svsk;
1459 }
1460
1461 bummer:
1462 dprintk("svc: svc_create_socket error = %d\n", -error);
1463 sock_release(sock);
1464 return ERR_PTR(error);
1465 }
1466
1467 /*
1468 * Detach the svc_sock from the socket so that no
1469 * more callbacks occur.
1470 */
1471 static void svc_sock_detach(struct svc_xprt *xprt)
1472 {
1473 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1474 struct sock *sk = svsk->sk_sk;
1475
1476 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1477
1478 /* put back the old socket callbacks */
1479 sk->sk_state_change = svsk->sk_ostate;
1480 sk->sk_data_ready = svsk->sk_odata;
1481 sk->sk_write_space = svsk->sk_owspace;
1482
1483 if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk)))
1484 wake_up_interruptible(sk_sleep(sk));
1485 }
1486
1487 /*
1488 * Disconnect the socket, and reset the callbacks
1489 */
1490 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1491 {
1492 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1493
1494 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1495
1496 svc_sock_detach(xprt);
1497
1498 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
1499 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1500 }
1501
1502 /*
1503 * Free the svc_sock's socket resources and the svc_sock itself.
1504 */
1505 static void svc_sock_free(struct svc_xprt *xprt)
1506 {
1507 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1508 dprintk("svc: svc_sock_free(%p)\n", svsk);
1509
1510 if (svsk->sk_sock->file)
1511 sockfd_put(svsk->sk_sock);
1512 else
1513 sock_release(svsk->sk_sock);
1514 kfree(svsk);
1515 }
1516
1517 /*
1518 * Create a svc_xprt.
1519 *
1520 * For internal use only (e.g. nfsv4.1 backchannel).
1521 * Callers should typically use the xpo_create() method.
1522 */
1523 struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
1524 {
1525 struct svc_sock *svsk;
1526 struct svc_xprt *xprt = NULL;
1527
1528 dprintk("svc: %s\n", __func__);
1529 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1530 if (!svsk)
1531 goto out;
1532
1533 xprt = &svsk->sk_xprt;
1534 if (prot == IPPROTO_TCP)
1535 svc_xprt_init(&svc_tcp_class, xprt, serv);
1536 else if (prot == IPPROTO_UDP)
1537 svc_xprt_init(&svc_udp_class, xprt, serv);
1538 else
1539 BUG();
1540 out:
1541 dprintk("svc: %s return %p\n", __func__, xprt);
1542 return xprt;
1543 }
1544 EXPORT_SYMBOL_GPL(svc_sock_create);
1545
1546 /*
1547 * Destroy a svc_sock.
1548 */
1549 void svc_sock_destroy(struct svc_xprt *xprt)
1550 {
1551 if (xprt)
1552 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1553 }
1554 EXPORT_SYMBOL_GPL(svc_sock_destroy);
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