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Linux 4.11-rc6
[linux/fpc-iii.git] / net / sunrpc / svcsock.c
blob2b720fa35c4ff7c2ae906e9e76d13d27a2b2f008
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/module.h>
25 #include <linux/errno.h>
26 #include <linux/fcntl.h>
27 #include <linux/net.h>
28 #include <linux/in.h>
29 #include <linux/inet.h>
30 #include <linux/udp.h>
31 #include <linux/tcp.h>
32 #include <linux/unistd.h>
33 #include <linux/slab.h>
34 #include <linux/netdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/file.h>
37 #include <linux/freezer.h>
38 #include <net/sock.h>
39 #include <net/checksum.h>
40 #include <net/ip.h>
41 #include <net/ipv6.h>
42 #include <net/udp.h>
43 #include <net/tcp.h>
44 #include <net/tcp_states.h>
45 #include <linux/uaccess.h>
46 #include <asm/ioctls.h>
47 #include <trace/events/skb.h>
48
49 #include <linux/sunrpc/types.h>
50 #include <linux/sunrpc/clnt.h>
51 #include <linux/sunrpc/xdr.h>
52 #include <linux/sunrpc/msg_prot.h>
53 #include <linux/sunrpc/svcsock.h>
54 #include <linux/sunrpc/stats.h>
55 #include <linux/sunrpc/xprt.h>
56
57 #include "sunrpc.h"
58
59 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
60
61
62 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
63 int flags);
64 static int svc_udp_recvfrom(struct svc_rqst *);
65 static int svc_udp_sendto(struct svc_rqst *);
66 static void svc_sock_detach(struct svc_xprt *);
67 static void svc_tcp_sock_detach(struct svc_xprt *);
68 static void svc_sock_free(struct svc_xprt *);
69
70 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
71 struct net *, struct sockaddr *,
72 int, int);
73 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
74 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77 static void svc_bc_sock_free(struct svc_xprt *xprt);
78 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
79
80 #ifdef CONFIG_DEBUG_LOCK_ALLOC
81 static struct lock_class_key svc_key[2];
82 static struct lock_class_key svc_slock_key[2];
83
84 static void svc_reclassify_socket(struct socket *sock)
85 {
86 struct sock *sk = sock->sk;
87
88 if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
89 return;
90
91 switch (sk->sk_family) {
92 case AF_INET:
93 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
94 &svc_slock_key[0],
95 "sk_xprt.xpt_lock-AF_INET-NFSD",
96 &svc_key[0]);
97 break;
98
99 case AF_INET6:
100 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
101 &svc_slock_key[1],
102 "sk_xprt.xpt_lock-AF_INET6-NFSD",
103 &svc_key[1]);
104 break;
105
106 default:
107 BUG();
108 }
109 }
110 #else
111 static void svc_reclassify_socket(struct socket *sock)
112 {
113 }
114 #endif
115
116 /*
117 * Release an skbuff after use
118 */
119 static void svc_release_skb(struct svc_rqst *rqstp)
120 {
121 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
122
123 if (skb) {
124 struct svc_sock *svsk =
125 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
126 rqstp->rq_xprt_ctxt = NULL;
127
128 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
129 skb_free_datagram_locked(svsk->sk_sk, skb);
130 }
131 }
132
133 static void svc_release_udp_skb(struct svc_rqst *rqstp)
134 {
135 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
136
137 if (skb) {
138 rqstp->rq_xprt_ctxt = NULL;
139
140 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
141 consume_skb(skb);
142 }
143 }
144
145 union svc_pktinfo_u {
146 struct in_pktinfo pkti;
147 struct in6_pktinfo pkti6;
148 };
149 #define SVC_PKTINFO_SPACE \
150 CMSG_SPACE(sizeof(union svc_pktinfo_u))
151
152 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
153 {
154 struct svc_sock *svsk =
155 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
156 switch (svsk->sk_sk->sk_family) {
157 case AF_INET: {
158 struct in_pktinfo *pki = CMSG_DATA(cmh);
159
160 cmh->cmsg_level = SOL_IP;
161 cmh->cmsg_type = IP_PKTINFO;
162 pki->ipi_ifindex = 0;
163 pki->ipi_spec_dst.s_addr =
164 svc_daddr_in(rqstp)->sin_addr.s_addr;
165 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
166 }
167 break;
168
169 case AF_INET6: {
170 struct in6_pktinfo *pki = CMSG_DATA(cmh);
171 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
172
173 cmh->cmsg_level = SOL_IPV6;
174 cmh->cmsg_type = IPV6_PKTINFO;
175 pki->ipi6_ifindex = daddr->sin6_scope_id;
176 pki->ipi6_addr = daddr->sin6_addr;
177 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
178 }
179 break;
180 }
181 }
182
183 /*
184 * send routine intended to be shared by the fore- and back-channel
185 */
186 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
187 struct page *headpage, unsigned long headoffset,
188 struct page *tailpage, unsigned long tailoffset)
189 {
190 int result;
191 int size;
192 struct page **ppage = xdr->pages;
193 size_t base = xdr->page_base;
194 unsigned int pglen = xdr->page_len;
195 unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST;
196 int slen;
197 int len = 0;
198
199 slen = xdr->len;
200
201 /* send head */
202 if (slen == xdr->head[0].iov_len)
203 flags = 0;
204 len = kernel_sendpage(sock, headpage, headoffset,
205 xdr->head[0].iov_len, flags);
206 if (len != xdr->head[0].iov_len)
207 goto out;
208 slen -= xdr->head[0].iov_len;
209 if (slen == 0)
210 goto out;
211
212 /* send page data */
213 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
214 while (pglen > 0) {
215 if (slen == size)
216 flags = 0;
217 result = kernel_sendpage(sock, *ppage, base, size, flags);
218 if (result > 0)
219 len += result;
220 if (result != size)
221 goto out;
222 slen -= size;
223 pglen -= size;
224 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
225 base = 0;
226 ppage++;
227 }
228
229 /* send tail */
230 if (xdr->tail[0].iov_len) {
231 result = kernel_sendpage(sock, tailpage, tailoffset,
232 xdr->tail[0].iov_len, 0);
233 if (result > 0)
234 len += result;
235 }
236
237 out:
238 return len;
239 }
240
241
242 /*
243 * Generic sendto routine
244 */
245 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
246 {
247 struct svc_sock *svsk =
248 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
249 struct socket *sock = svsk->sk_sock;
250 union {
251 struct cmsghdr hdr;
252 long all[SVC_PKTINFO_SPACE / sizeof(long)];
253 } buffer;
254 struct cmsghdr *cmh = &buffer.hdr;
255 int len = 0;
256 unsigned long tailoff;
257 unsigned long headoff;
258 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
259
260 if (rqstp->rq_prot == IPPROTO_UDP) {
261 struct msghdr msg = {
262 .msg_name = &rqstp->rq_addr,
263 .msg_namelen = rqstp->rq_addrlen,
264 .msg_control = cmh,
265 .msg_controllen = sizeof(buffer),
266 .msg_flags = MSG_MORE,
267 };
268
269 svc_set_cmsg_data(rqstp, cmh);
270
271 if (sock_sendmsg(sock, &msg) < 0)
272 goto out;
273 }
274
275 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
276 headoff = 0;
277 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
278 rqstp->rq_respages[0], tailoff);
279
280 out:
281 dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n",
282 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
283 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
284
285 return len;
286 }
287
288 /*
289 * Report socket names for nfsdfs
290 */
291 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
292 {
293 const struct sock *sk = svsk->sk_sk;
294 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
295 "udp" : "tcp";
296 int len;
297
298 switch (sk->sk_family) {
299 case PF_INET:
300 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
301 proto_name,
302 &inet_sk(sk)->inet_rcv_saddr,
303 inet_sk(sk)->inet_num);
304 break;
305 #if IS_ENABLED(CONFIG_IPV6)
306 case PF_INET6:
307 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
308 proto_name,
309 &sk->sk_v6_rcv_saddr,
310 inet_sk(sk)->inet_num);
311 break;
312 #endif
313 default:
314 len = snprintf(buf, remaining, "*unknown-%d*\n",
315 sk->sk_family);
316 }
317
318 if (len >= remaining) {
319 *buf = '\0';
320 return -ENAMETOOLONG;
321 }
322 return len;
323 }
324
325 /*
326 * Generic recvfrom routine.
327 */
328 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
329 int buflen)
330 {
331 struct svc_sock *svsk =
332 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
333 struct msghdr msg = {
334 .msg_flags = MSG_DONTWAIT,
335 };
336 int len;
337
338 rqstp->rq_xprt_hlen = 0;
339
340 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
341 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
342 msg.msg_flags);
343 /* If we read a full record, then assume there may be more
344 * data to read (stream based sockets only!)
345 */
346 if (len == buflen)
347 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
348
349 dprintk("svc: socket %p recvfrom(%p, %zu) = %d\n",
350 svsk, iov[0].iov_base, iov[0].iov_len, len);
351 return len;
352 }
353
354 static int svc_partial_recvfrom(struct svc_rqst *rqstp,
355 struct kvec *iov, int nr,
356 int buflen, unsigned int base)
357 {
358 size_t save_iovlen;
359 void *save_iovbase;
360 unsigned int i;
361 int ret;
362
363 if (base == 0)
364 return svc_recvfrom(rqstp, iov, nr, buflen);
365
366 for (i = 0; i < nr; i++) {
367 if (iov[i].iov_len > base)
368 break;
369 base -= iov[i].iov_len;
370 }
371 save_iovlen = iov[i].iov_len;
372 save_iovbase = iov[i].iov_base;
373 iov[i].iov_len -= base;
374 iov[i].iov_base += base;
375 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
376 iov[i].iov_len = save_iovlen;
377 iov[i].iov_base = save_iovbase;
378 return ret;
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_write_space(sock->sk);
404 release_sock(sock->sk);
405 #endif
406 }
407
408 static int svc_sock_secure_port(struct svc_rqst *rqstp)
409 {
410 return svc_port_is_privileged(svc_addr(rqstp));
411 }
412
413 /*
414 * INET callback when data has been received on the socket.
415 */
416 static void svc_data_ready(struct sock *sk)
417 {
418 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
419
420 if (svsk) {
421 dprintk("svc: socket %p(inet %p), busy=%d\n",
422 svsk, sk,
423 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
424 svsk->sk_odata(sk);
425 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
426 svc_xprt_enqueue(&svsk->sk_xprt);
427 }
428 }
429
430 /*
431 * INET callback when space is newly available on the socket.
432 */
433 static void svc_write_space(struct sock *sk)
434 {
435 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
436
437 if (svsk) {
438 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
439 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
440 svsk->sk_owspace(sk);
441 svc_xprt_enqueue(&svsk->sk_xprt);
442 }
443 }
444
445 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
446 {
447 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
448
449 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
450 return 1;
451 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
452 }
453
454 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
455 {
456 struct svc_sock *svsk;
457 struct socket *sock;
458 struct linger no_linger = {
459 .l_onoff = 1,
460 .l_linger = 0,
461 };
462
463 svsk = container_of(xprt, struct svc_sock, sk_xprt);
464 sock = svsk->sk_sock;
465 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
466 (char *)&no_linger, sizeof(no_linger));
467 }
468
469 /*
470 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
471 */
472 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
473 struct cmsghdr *cmh)
474 {
475 struct in_pktinfo *pki = CMSG_DATA(cmh);
476 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
477
478 if (cmh->cmsg_type != IP_PKTINFO)
479 return 0;
480
481 daddr->sin_family = AF_INET;
482 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
483 return 1;
484 }
485
486 /*
487 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
488 */
489 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
490 struct cmsghdr *cmh)
491 {
492 struct in6_pktinfo *pki = CMSG_DATA(cmh);
493 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
494
495 if (cmh->cmsg_type != IPV6_PKTINFO)
496 return 0;
497
498 daddr->sin6_family = AF_INET6;
499 daddr->sin6_addr = pki->ipi6_addr;
500 daddr->sin6_scope_id = pki->ipi6_ifindex;
501 return 1;
502 }
503
504 /*
505 * Copy the UDP datagram's destination address to the rqstp structure.
506 * The 'destination' address in this case is the address to which the
507 * peer sent the datagram, i.e. our local address. For multihomed
508 * hosts, this can change from msg to msg. Note that only the IP
509 * address changes, the port number should remain the same.
510 */
511 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
512 struct cmsghdr *cmh)
513 {
514 switch (cmh->cmsg_level) {
515 case SOL_IP:
516 return svc_udp_get_dest_address4(rqstp, cmh);
517 case SOL_IPV6:
518 return svc_udp_get_dest_address6(rqstp, cmh);
519 }
520
521 return 0;
522 }
523
524 /*
525 * Receive a datagram from a UDP socket.
526 */
527 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
528 {
529 struct svc_sock *svsk =
530 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
531 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
532 struct sk_buff *skb;
533 union {
534 struct cmsghdr hdr;
535 long all[SVC_PKTINFO_SPACE / sizeof(long)];
536 } buffer;
537 struct cmsghdr *cmh = &buffer.hdr;
538 struct msghdr msg = {
539 .msg_name = svc_addr(rqstp),
540 .msg_control = cmh,
541 .msg_controllen = sizeof(buffer),
542 .msg_flags = MSG_DONTWAIT,
543 };
544 size_t len;
545 int err;
546
547 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
548 /* udp sockets need large rcvbuf as all pending
549 * requests are still in that buffer. sndbuf must
550 * also be large enough that there is enough space
551 * for one reply per thread. We count all threads
552 * rather than threads in a particular pool, which
553 * provides an upper bound on the number of threads
554 * which will access the socket.
555 */
556 svc_sock_setbufsize(svsk->sk_sock,
557 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
558 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
559
560 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
561 skb = NULL;
562 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
563 0, 0, MSG_PEEK | MSG_DONTWAIT);
564 if (err >= 0)
565 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
566
567 if (skb == NULL) {
568 if (err != -EAGAIN) {
569 /* possibly an icmp error */
570 dprintk("svc: recvfrom returned error %d\n", -err);
571 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
572 }
573 return 0;
574 }
575 len = svc_addr_len(svc_addr(rqstp));
576 rqstp->rq_addrlen = len;
577 if (skb->tstamp == 0) {
578 skb->tstamp = ktime_get_real();
579 /* Don't enable netstamp, sunrpc doesn't
580 need that much accuracy */
581 }
582 svsk->sk_sk->sk_stamp = skb->tstamp;
583 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
584
585 len = skb->len;
586 rqstp->rq_arg.len = len;
587
588 rqstp->rq_prot = IPPROTO_UDP;
589
590 if (!svc_udp_get_dest_address(rqstp, cmh)) {
591 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
592 cmh->cmsg_level, cmh->cmsg_type);
593 goto out_free;
594 }
595 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
596
597 if (skb_is_nonlinear(skb)) {
598 /* we have to copy */
599 local_bh_disable();
600 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
601 local_bh_enable();
602 /* checksum error */
603 goto out_free;
604 }
605 local_bh_enable();
606 consume_skb(skb);
607 } else {
608 /* we can use it in-place */
609 rqstp->rq_arg.head[0].iov_base = skb->data;
610 rqstp->rq_arg.head[0].iov_len = len;
611 if (skb_checksum_complete(skb))
612 goto out_free;
613 rqstp->rq_xprt_ctxt = skb;
614 }
615
616 rqstp->rq_arg.page_base = 0;
617 if (len <= rqstp->rq_arg.head[0].iov_len) {
618 rqstp->rq_arg.head[0].iov_len = len;
619 rqstp->rq_arg.page_len = 0;
620 rqstp->rq_respages = rqstp->rq_pages+1;
621 } else {
622 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
623 rqstp->rq_respages = rqstp->rq_pages + 1 +
624 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
625 }
626 rqstp->rq_next_page = rqstp->rq_respages+1;
627
628 if (serv->sv_stats)
629 serv->sv_stats->netudpcnt++;
630
631 return len;
632 out_free:
633 kfree_skb(skb);
634 return 0;
635 }
636
637 static int
638 svc_udp_sendto(struct svc_rqst *rqstp)
639 {
640 int error;
641
642 error = svc_sendto(rqstp, &rqstp->rq_res);
643 if (error == -ECONNREFUSED)
644 /* ICMP error on earlier request. */
645 error = svc_sendto(rqstp, &rqstp->rq_res);
646
647 return error;
648 }
649
650 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
651 {
652 }
653
654 static int svc_udp_has_wspace(struct svc_xprt *xprt)
655 {
656 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
657 struct svc_serv *serv = xprt->xpt_server;
658 unsigned long required;
659
660 /*
661 * Set the SOCK_NOSPACE flag before checking the available
662 * sock space.
663 */
664 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
665 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
666 if (required*2 > sock_wspace(svsk->sk_sk))
667 return 0;
668 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
669 return 1;
670 }
671
672 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
673 {
674 BUG();
675 return NULL;
676 }
677
678 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
679 {
680 }
681
682 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
683 struct net *net,
684 struct sockaddr *sa, int salen,
685 int flags)
686 {
687 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
688 }
689
690 static struct svc_xprt_ops svc_udp_ops = {
691 .xpo_create = svc_udp_create,
692 .xpo_recvfrom = svc_udp_recvfrom,
693 .xpo_sendto = svc_udp_sendto,
694 .xpo_release_rqst = svc_release_udp_skb,
695 .xpo_detach = svc_sock_detach,
696 .xpo_free = svc_sock_free,
697 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
698 .xpo_has_wspace = svc_udp_has_wspace,
699 .xpo_accept = svc_udp_accept,
700 .xpo_secure_port = svc_sock_secure_port,
701 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
702 };
703
704 static struct svc_xprt_class svc_udp_class = {
705 .xcl_name = "udp",
706 .xcl_owner = THIS_MODULE,
707 .xcl_ops = &svc_udp_ops,
708 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
709 .xcl_ident = XPRT_TRANSPORT_UDP,
710 };
711
712 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
713 {
714 int err, level, optname, one = 1;
715
716 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
717 &svsk->sk_xprt, serv);
718 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
719 svsk->sk_sk->sk_data_ready = svc_data_ready;
720 svsk->sk_sk->sk_write_space = svc_write_space;
721
722 /* initialise setting must have enough space to
723 * receive and respond to one request.
724 * svc_udp_recvfrom will re-adjust if necessary
725 */
726 svc_sock_setbufsize(svsk->sk_sock,
727 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
728 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
729
730 /* data might have come in before data_ready set up */
731 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
732 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
733
734 /* make sure we get destination address info */
735 switch (svsk->sk_sk->sk_family) {
736 case AF_INET:
737 level = SOL_IP;
738 optname = IP_PKTINFO;
739 break;
740 case AF_INET6:
741 level = SOL_IPV6;
742 optname = IPV6_RECVPKTINFO;
743 break;
744 default:
745 BUG();
746 }
747 err = kernel_setsockopt(svsk->sk_sock, level, optname,
748 (char *)&one, sizeof(one));
749 dprintk("svc: kernel_setsockopt returned %d\n", err);
750 }
751
752 /*
753 * A data_ready event on a listening socket means there's a connection
754 * pending. Do not use state_change as a substitute for it.
755 */
756 static void svc_tcp_listen_data_ready(struct sock *sk)
757 {
758 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
759
760 dprintk("svc: socket %p TCP (listen) state change %d\n",
761 sk, sk->sk_state);
762
763 if (svsk)
764 svsk->sk_odata(sk);
765 /*
766 * This callback may called twice when a new connection
767 * is established as a child socket inherits everything
768 * from a parent LISTEN socket.
769 * 1) data_ready method of the parent socket will be called
770 * when one of child sockets become ESTABLISHED.
771 * 2) data_ready method of the child socket may be called
772 * when it receives data before the socket is accepted.
773 * In case of 2, we should ignore it silently.
774 */
775 if (sk->sk_state == TCP_LISTEN) {
776 if (svsk) {
777 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
778 svc_xprt_enqueue(&svsk->sk_xprt);
779 } else
780 printk("svc: socket %p: no user data\n", sk);
781 }
782 }
783
784 /*
785 * A state change on a connected socket means it's dying or dead.
786 */
787 static void svc_tcp_state_change(struct sock *sk)
788 {
789 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
790
791 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
792 sk, sk->sk_state, sk->sk_user_data);
793
794 if (!svsk)
795 printk("svc: socket %p: no user data\n", sk);
796 else {
797 svsk->sk_ostate(sk);
798 if (sk->sk_state != TCP_ESTABLISHED) {
799 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
800 svc_xprt_enqueue(&svsk->sk_xprt);
801 }
802 }
803 }
804
805 /*
806 * Accept a TCP connection
807 */
808 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
809 {
810 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
811 struct sockaddr_storage addr;
812 struct sockaddr *sin = (struct sockaddr *) &addr;
813 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
814 struct socket *sock = svsk->sk_sock;
815 struct socket *newsock;
816 struct svc_sock *newsvsk;
817 int err, slen;
818 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
819
820 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
821 if (!sock)
822 return NULL;
823
824 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
825 err = kernel_accept(sock, &newsock, O_NONBLOCK);
826 if (err < 0) {
827 if (err == -ENOMEM)
828 printk(KERN_WARNING "%s: no more sockets!\n",
829 serv->sv_name);
830 else if (err != -EAGAIN)
831 net_warn_ratelimited("%s: accept failed (err %d)!\n",
832 serv->sv_name, -err);
833 return NULL;
834 }
835 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
836
837 err = kernel_getpeername(newsock, sin, &slen);
838 if (err < 0) {
839 net_warn_ratelimited("%s: peername failed (err %d)!\n",
840 serv->sv_name, -err);
841 goto failed; /* aborted connection or whatever */
842 }
843
844 /* Ideally, we would want to reject connections from unauthorized
845 * hosts here, but when we get encryption, the IP of the host won't
846 * tell us anything. For now just warn about unpriv connections.
847 */
848 if (!svc_port_is_privileged(sin)) {
849 dprintk("%s: connect from unprivileged port: %s\n",
850 serv->sv_name,
851 __svc_print_addr(sin, buf, sizeof(buf)));
852 }
853 dprintk("%s: connect from %s\n", serv->sv_name,
854 __svc_print_addr(sin, buf, sizeof(buf)));
855
856 /* Reset the inherited callbacks before calling svc_setup_socket */
857 newsock->sk->sk_state_change = svsk->sk_ostate;
858 newsock->sk->sk_data_ready = svsk->sk_odata;
859 newsock->sk->sk_write_space = svsk->sk_owspace;
860
861 /* make sure that a write doesn't block forever when
862 * low on memory
863 */
864 newsock->sk->sk_sndtimeo = HZ*30;
865
866 newsvsk = svc_setup_socket(serv, newsock,
867 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
868 if (IS_ERR(newsvsk))
869 goto failed;
870 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
871 err = kernel_getsockname(newsock, sin, &slen);
872 if (unlikely(err < 0)) {
873 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
874 slen = offsetof(struct sockaddr, sa_data);
875 }
876 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
877
878 if (sock_is_loopback(newsock->sk))
879 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
880 else
881 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
882 if (serv->sv_stats)
883 serv->sv_stats->nettcpconn++;
884
885 return &newsvsk->sk_xprt;
886
887 failed:
888 sock_release(newsock);
889 return NULL;
890 }
891
892 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
893 {
894 unsigned int i, len, npages;
895
896 if (svsk->sk_datalen == 0)
897 return 0;
898 len = svsk->sk_datalen;
899 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
900 for (i = 0; i < npages; i++) {
901 if (rqstp->rq_pages[i] != NULL)
902 put_page(rqstp->rq_pages[i]);
903 BUG_ON(svsk->sk_pages[i] == NULL);
904 rqstp->rq_pages[i] = svsk->sk_pages[i];
905 svsk->sk_pages[i] = NULL;
906 }
907 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
908 return len;
909 }
910
911 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
912 {
913 unsigned int i, len, npages;
914
915 if (svsk->sk_datalen == 0)
916 return;
917 len = svsk->sk_datalen;
918 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
919 for (i = 0; i < npages; i++) {
920 svsk->sk_pages[i] = rqstp->rq_pages[i];
921 rqstp->rq_pages[i] = NULL;
922 }
923 }
924
925 static void svc_tcp_clear_pages(struct svc_sock *svsk)
926 {
927 unsigned int i, len, npages;
928
929 if (svsk->sk_datalen == 0)
930 goto out;
931 len = svsk->sk_datalen;
932 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
933 for (i = 0; i < npages; i++) {
934 if (svsk->sk_pages[i] == NULL) {
935 WARN_ON_ONCE(1);
936 continue;
937 }
938 put_page(svsk->sk_pages[i]);
939 svsk->sk_pages[i] = NULL;
940 }
941 out:
942 svsk->sk_tcplen = 0;
943 svsk->sk_datalen = 0;
944 }
945
946 /*
947 * Receive fragment record header.
948 * If we haven't gotten the record length yet, get the next four bytes.
949 */
950 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
951 {
952 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
953 unsigned int want;
954 int len;
955
956 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
957 struct kvec iov;
958
959 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
960 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
961 iov.iov_len = want;
962 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
963 goto error;
964 svsk->sk_tcplen += len;
965
966 if (len < want) {
967 dprintk("svc: short recvfrom while reading record "
968 "length (%d of %d)\n", len, want);
969 return -EAGAIN;
970 }
971
972 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
973 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
974 serv->sv_max_mesg) {
975 net_notice_ratelimited("RPC: fragment too large: %d\n",
976 svc_sock_reclen(svsk));
977 goto err_delete;
978 }
979 }
980
981 return svc_sock_reclen(svsk);
982 error:
983 dprintk("RPC: TCP recv_record got %d\n", len);
984 return len;
985 err_delete:
986 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
987 return -EAGAIN;
988 }
989
990 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
991 {
992 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
993 struct rpc_rqst *req = NULL;
994 struct kvec *src, *dst;
995 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
996 __be32 xid;
997 __be32 calldir;
998
999 xid = *p++;
1000 calldir = *p;
1001
1002 if (!bc_xprt)
1003 return -EAGAIN;
1004 spin_lock_bh(&bc_xprt->transport_lock);
1005 req = xprt_lookup_rqst(bc_xprt, xid);
1006 if (!req)
1007 goto unlock_notfound;
1008
1009 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1010 /*
1011 * XXX!: cheating for now! Only copying HEAD.
1012 * But we know this is good enough for now (in fact, for any
1013 * callback reply in the forseeable future).
1014 */
1015 dst = &req->rq_private_buf.head[0];
1016 src = &rqstp->rq_arg.head[0];
1017 if (dst->iov_len < src->iov_len)
1018 goto unlock_eagain; /* whatever; just giving up. */
1019 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1020 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1021 rqstp->rq_arg.len = 0;
1022 spin_unlock_bh(&bc_xprt->transport_lock);
1023 return 0;
1024 unlock_notfound:
1025 printk(KERN_NOTICE
1026 "%s: Got unrecognized reply: "
1027 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1028 __func__, ntohl(calldir),
1029 bc_xprt, ntohl(xid));
1030 unlock_eagain:
1031 spin_unlock_bh(&bc_xprt->transport_lock);
1032 return -EAGAIN;
1033 }
1034
1035 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1036 {
1037 int i = 0;
1038 int t = 0;
1039
1040 while (t < len) {
1041 vec[i].iov_base = page_address(pages[i]);
1042 vec[i].iov_len = PAGE_SIZE;
1043 i++;
1044 t += PAGE_SIZE;
1045 }
1046 return i;
1047 }
1048
1049 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1050 {
1051 /* If we have more data, signal svc_xprt_enqueue() to try again */
1052 dprintk("svc: TCP %s record (%d bytes)\n",
1053 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1054 svc_sock_reclen(svsk));
1055 svsk->sk_tcplen = 0;
1056 svsk->sk_reclen = 0;
1057 }
1058
1059 /*
1060 * Receive data from a TCP socket.
1061 */
1062 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1063 {
1064 struct svc_sock *svsk =
1065 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1066 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1067 int len;
1068 struct kvec *vec;
1069 unsigned int want, base;
1070 __be32 *p;
1071 __be32 calldir;
1072 int pnum;
1073
1074 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1075 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1076 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1077 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1078
1079 len = svc_tcp_recv_record(svsk, rqstp);
1080 if (len < 0)
1081 goto error;
1082
1083 base = svc_tcp_restore_pages(svsk, rqstp);
1084 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1085
1086 vec = rqstp->rq_vec;
1087
1088 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1089 svsk->sk_datalen + want);
1090
1091 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1092 rqstp->rq_next_page = rqstp->rq_respages + 1;
1093
1094 /* Now receive data */
1095 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1096 if (len >= 0) {
1097 svsk->sk_tcplen += len;
1098 svsk->sk_datalen += len;
1099 }
1100 if (len != want || !svc_sock_final_rec(svsk)) {
1101 svc_tcp_save_pages(svsk, rqstp);
1102 if (len < 0 && len != -EAGAIN)
1103 goto err_delete;
1104 if (len == want)
1105 svc_tcp_fragment_received(svsk);
1106 else
1107 dprintk("svc: incomplete TCP record (%d of %d)\n",
1108 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1109 svc_sock_reclen(svsk));
1110 goto err_noclose;
1111 }
1112
1113 if (svsk->sk_datalen < 8) {
1114 svsk->sk_datalen = 0;
1115 goto err_delete; /* client is nuts. */
1116 }
1117
1118 rqstp->rq_arg.len = svsk->sk_datalen;
1119 rqstp->rq_arg.page_base = 0;
1120 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1121 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1122 rqstp->rq_arg.page_len = 0;
1123 } else
1124 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1125
1126 rqstp->rq_xprt_ctxt = NULL;
1127 rqstp->rq_prot = IPPROTO_TCP;
1128 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1129 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1130 else
1131 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1132
1133 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1134 calldir = p[1];
1135 if (calldir)
1136 len = receive_cb_reply(svsk, rqstp);
1137
1138 /* Reset TCP read info */
1139 svsk->sk_datalen = 0;
1140 svc_tcp_fragment_received(svsk);
1141
1142 if (len < 0)
1143 goto error;
1144
1145 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1146 if (serv->sv_stats)
1147 serv->sv_stats->nettcpcnt++;
1148
1149 return rqstp->rq_arg.len;
1150
1151 error:
1152 if (len != -EAGAIN)
1153 goto err_delete;
1154 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1155 return 0;
1156 err_delete:
1157 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1158 svsk->sk_xprt.xpt_server->sv_name, -len);
1159 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1160 err_noclose:
1161 return 0; /* record not complete */
1162 }
1163
1164 /*
1165 * Send out data on TCP socket.
1166 */
1167 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1168 {
1169 struct xdr_buf *xbufp = &rqstp->rq_res;
1170 int sent;
1171 __be32 reclen;
1172
1173 /* Set up the first element of the reply kvec.
1174 * Any other kvecs that may be in use have been taken
1175 * care of by the server implementation itself.
1176 */
1177 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1178 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1179
1180 sent = svc_sendto(rqstp, &rqstp->rq_res);
1181 if (sent != xbufp->len) {
1182 printk(KERN_NOTICE
1183 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1184 "- shutting down socket\n",
1185 rqstp->rq_xprt->xpt_server->sv_name,
1186 (sent<0)?"got error":"sent only",
1187 sent, xbufp->len);
1188 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1189 svc_xprt_enqueue(rqstp->rq_xprt);
1190 sent = -EAGAIN;
1191 }
1192 return sent;
1193 }
1194
1195 /*
1196 * Setup response header. TCP has a 4B record length field.
1197 */
1198 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1199 {
1200 struct kvec *resv = &rqstp->rq_res.head[0];
1201
1202 /* tcp needs a space for the record length... */
1203 svc_putnl(resv, 0);
1204 }
1205
1206 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1207 struct net *net,
1208 struct sockaddr *sa, int salen,
1209 int flags)
1210 {
1211 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1212 }
1213
1214 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1215 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1216 struct net *, struct sockaddr *,
1217 int, int);
1218 static void svc_bc_sock_free(struct svc_xprt *xprt);
1219
1220 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1221 struct net *net,
1222 struct sockaddr *sa, int salen,
1223 int flags)
1224 {
1225 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1226 }
1227
1228 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1229 {
1230 }
1231
1232 static struct svc_xprt_ops svc_tcp_bc_ops = {
1233 .xpo_create = svc_bc_tcp_create,
1234 .xpo_detach = svc_bc_tcp_sock_detach,
1235 .xpo_free = svc_bc_sock_free,
1236 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1237 .xpo_secure_port = svc_sock_secure_port,
1238 };
1239
1240 static struct svc_xprt_class svc_tcp_bc_class = {
1241 .xcl_name = "tcp-bc",
1242 .xcl_owner = THIS_MODULE,
1243 .xcl_ops = &svc_tcp_bc_ops,
1244 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1245 };
1246
1247 static void svc_init_bc_xprt_sock(void)
1248 {
1249 svc_reg_xprt_class(&svc_tcp_bc_class);
1250 }
1251
1252 static void svc_cleanup_bc_xprt_sock(void)
1253 {
1254 svc_unreg_xprt_class(&svc_tcp_bc_class);
1255 }
1256 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1257 static void svc_init_bc_xprt_sock(void)
1258 {
1259 }
1260
1261 static void svc_cleanup_bc_xprt_sock(void)
1262 {
1263 }
1264 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1265
1266 static struct svc_xprt_ops svc_tcp_ops = {
1267 .xpo_create = svc_tcp_create,
1268 .xpo_recvfrom = svc_tcp_recvfrom,
1269 .xpo_sendto = svc_tcp_sendto,
1270 .xpo_release_rqst = svc_release_skb,
1271 .xpo_detach = svc_tcp_sock_detach,
1272 .xpo_free = svc_sock_free,
1273 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1274 .xpo_has_wspace = svc_tcp_has_wspace,
1275 .xpo_accept = svc_tcp_accept,
1276 .xpo_secure_port = svc_sock_secure_port,
1277 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1278 };
1279
1280 static struct svc_xprt_class svc_tcp_class = {
1281 .xcl_name = "tcp",
1282 .xcl_owner = THIS_MODULE,
1283 .xcl_ops = &svc_tcp_ops,
1284 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1285 .xcl_ident = XPRT_TRANSPORT_TCP,
1286 };
1287
1288 void svc_init_xprt_sock(void)
1289 {
1290 svc_reg_xprt_class(&svc_tcp_class);
1291 svc_reg_xprt_class(&svc_udp_class);
1292 svc_init_bc_xprt_sock();
1293 }
1294
1295 void svc_cleanup_xprt_sock(void)
1296 {
1297 svc_unreg_xprt_class(&svc_tcp_class);
1298 svc_unreg_xprt_class(&svc_udp_class);
1299 svc_cleanup_bc_xprt_sock();
1300 }
1301
1302 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1303 {
1304 struct sock *sk = svsk->sk_sk;
1305
1306 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1307 &svsk->sk_xprt, serv);
1308 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1309 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1310 if (sk->sk_state == TCP_LISTEN) {
1311 dprintk("setting up TCP socket for listening\n");
1312 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1313 sk->sk_data_ready = svc_tcp_listen_data_ready;
1314 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1315 } else {
1316 dprintk("setting up TCP socket for reading\n");
1317 sk->sk_state_change = svc_tcp_state_change;
1318 sk->sk_data_ready = svc_data_ready;
1319 sk->sk_write_space = svc_write_space;
1320
1321 svsk->sk_reclen = 0;
1322 svsk->sk_tcplen = 0;
1323 svsk->sk_datalen = 0;
1324 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1325
1326 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1327
1328 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1329 switch (sk->sk_state) {
1330 case TCP_SYN_RECV:
1331 case TCP_ESTABLISHED:
1332 break;
1333 default:
1334 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1335 }
1336 }
1337 }
1338
1339 void svc_sock_update_bufs(struct svc_serv *serv)
1340 {
1341 /*
1342 * The number of server threads has changed. Update
1343 * rcvbuf and sndbuf accordingly on all sockets
1344 */
1345 struct svc_sock *svsk;
1346
1347 spin_lock_bh(&serv->sv_lock);
1348 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1349 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1350 spin_unlock_bh(&serv->sv_lock);
1351 }
1352 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1353
1354 /*
1355 * Initialize socket for RPC use and create svc_sock struct
1356 */
1357 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1358 struct socket *sock,
1359 int flags)
1360 {
1361 struct svc_sock *svsk;
1362 struct sock *inet;
1363 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1364 int err = 0;
1365
1366 dprintk("svc: svc_setup_socket %p\n", sock);
1367 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1368 if (!svsk)
1369 return ERR_PTR(-ENOMEM);
1370
1371 inet = sock->sk;
1372
1373 /* Register socket with portmapper */
1374 if (pmap_register)
1375 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1376 inet->sk_protocol,
1377 ntohs(inet_sk(inet)->inet_sport));
1378
1379 if (err < 0) {
1380 kfree(svsk);
1381 return ERR_PTR(err);
1382 }
1383
1384 inet->sk_user_data = svsk;
1385 svsk->sk_sock = sock;
1386 svsk->sk_sk = inet;
1387 svsk->sk_ostate = inet->sk_state_change;
1388 svsk->sk_odata = inet->sk_data_ready;
1389 svsk->sk_owspace = inet->sk_write_space;
1390
1391 /* Initialize the socket */
1392 if (sock->type == SOCK_DGRAM)
1393 svc_udp_init(svsk, serv);
1394 else
1395 svc_tcp_init(svsk, serv);
1396
1397 dprintk("svc: svc_setup_socket created %p (inet %p), "
1398 "listen %d close %d\n",
1399 svsk, svsk->sk_sk,
1400 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1401 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1402
1403 return svsk;
1404 }
1405
1406 bool svc_alien_sock(struct net *net, int fd)
1407 {
1408 int err;
1409 struct socket *sock = sockfd_lookup(fd, &err);
1410 bool ret = false;
1411
1412 if (!sock)
1413 goto out;
1414 if (sock_net(sock->sk) != net)
1415 ret = true;
1416 sockfd_put(sock);
1417 out:
1418 return ret;
1419 }
1420 EXPORT_SYMBOL_GPL(svc_alien_sock);
1421
1422 /**
1423 * svc_addsock - add a listener socket to an RPC service
1424 * @serv: pointer to RPC service to which to add a new listener
1425 * @fd: file descriptor of the new listener
1426 * @name_return: pointer to buffer to fill in with name of listener
1427 * @len: size of the buffer
1428 *
1429 * Fills in socket name and returns positive length of name if successful.
1430 * Name is terminated with '\n'. On error, returns a negative errno
1431 * value.
1432 */
1433 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1434 const size_t len)
1435 {
1436 int err = 0;
1437 struct socket *so = sockfd_lookup(fd, &err);
1438 struct svc_sock *svsk = NULL;
1439 struct sockaddr_storage addr;
1440 struct sockaddr *sin = (struct sockaddr *)&addr;
1441 int salen;
1442
1443 if (!so)
1444 return err;
1445 err = -EAFNOSUPPORT;
1446 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1447 goto out;
1448 err = -EPROTONOSUPPORT;
1449 if (so->sk->sk_protocol != IPPROTO_TCP &&
1450 so->sk->sk_protocol != IPPROTO_UDP)
1451 goto out;
1452 err = -EISCONN;
1453 if (so->state > SS_UNCONNECTED)
1454 goto out;
1455 err = -ENOENT;
1456 if (!try_module_get(THIS_MODULE))
1457 goto out;
1458 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1459 if (IS_ERR(svsk)) {
1460 module_put(THIS_MODULE);
1461 err = PTR_ERR(svsk);
1462 goto out;
1463 }
1464 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1465 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1466 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1467 return svc_one_sock_name(svsk, name_return, len);
1468 out:
1469 sockfd_put(so);
1470 return err;
1471 }
1472 EXPORT_SYMBOL_GPL(svc_addsock);
1473
1474 /*
1475 * Create socket for RPC service.
1476 */
1477 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1478 int protocol,
1479 struct net *net,
1480 struct sockaddr *sin, int len,
1481 int flags)
1482 {
1483 struct svc_sock *svsk;
1484 struct socket *sock;
1485 int error;
1486 int type;
1487 struct sockaddr_storage addr;
1488 struct sockaddr *newsin = (struct sockaddr *)&addr;
1489 int newlen;
1490 int family;
1491 int val;
1492 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1493
1494 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1495 serv->sv_program->pg_name, protocol,
1496 __svc_print_addr(sin, buf, sizeof(buf)));
1497
1498 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1499 printk(KERN_WARNING "svc: only UDP and TCP "
1500 "sockets supported\n");
1501 return ERR_PTR(-EINVAL);
1502 }
1503
1504 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1505 switch (sin->sa_family) {
1506 case AF_INET6:
1507 family = PF_INET6;
1508 break;
1509 case AF_INET:
1510 family = PF_INET;
1511 break;
1512 default:
1513 return ERR_PTR(-EINVAL);
1514 }
1515
1516 error = __sock_create(net, family, type, protocol, &sock, 1);
1517 if (error < 0)
1518 return ERR_PTR(error);
1519
1520 svc_reclassify_socket(sock);
1521
1522 /*
1523 * If this is an PF_INET6 listener, we want to avoid
1524 * getting requests from IPv4 remotes. Those should
1525 * be shunted to a PF_INET listener via rpcbind.
1526 */
1527 val = 1;
1528 if (family == PF_INET6)
1529 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1530 (char *)&val, sizeof(val));
1531
1532 if (type == SOCK_STREAM)
1533 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1534 error = kernel_bind(sock, sin, len);
1535 if (error < 0)
1536 goto bummer;
1537
1538 newlen = len;
1539 error = kernel_getsockname(sock, newsin, &newlen);
1540 if (error < 0)
1541 goto bummer;
1542
1543 if (protocol == IPPROTO_TCP) {
1544 if ((error = kernel_listen(sock, 64)) < 0)
1545 goto bummer;
1546 }
1547
1548 svsk = svc_setup_socket(serv, sock, flags);
1549 if (IS_ERR(svsk)) {
1550 error = PTR_ERR(svsk);
1551 goto bummer;
1552 }
1553 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1554 return (struct svc_xprt *)svsk;
1555 bummer:
1556 dprintk("svc: svc_create_socket error = %d\n", -error);
1557 sock_release(sock);
1558 return ERR_PTR(error);
1559 }
1560
1561 /*
1562 * Detach the svc_sock from the socket so that no
1563 * more callbacks occur.
1564 */
1565 static void svc_sock_detach(struct svc_xprt *xprt)
1566 {
1567 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1568 struct sock *sk = svsk->sk_sk;
1569
1570 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1571
1572 /* put back the old socket callbacks */
1573 lock_sock(sk);
1574 sk->sk_state_change = svsk->sk_ostate;
1575 sk->sk_data_ready = svsk->sk_odata;
1576 sk->sk_write_space = svsk->sk_owspace;
1577 sk->sk_user_data = NULL;
1578 release_sock(sk);
1579 }
1580
1581 /*
1582 * Disconnect the socket, and reset the callbacks
1583 */
1584 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1585 {
1586 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1587
1588 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1589
1590 svc_sock_detach(xprt);
1591
1592 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1593 svc_tcp_clear_pages(svsk);
1594 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1595 }
1596 }
1597
1598 /*
1599 * Free the svc_sock's socket resources and the svc_sock itself.
1600 */
1601 static void svc_sock_free(struct svc_xprt *xprt)
1602 {
1603 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1604 dprintk("svc: svc_sock_free(%p)\n", svsk);
1605
1606 if (svsk->sk_sock->file)
1607 sockfd_put(svsk->sk_sock);
1608 else
1609 sock_release(svsk->sk_sock);
1610 kfree(svsk);
1611 }
1612
1613 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1614 /*
1615 * Create a back channel svc_xprt which shares the fore channel socket.
1616 */
1617 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1618 int protocol,
1619 struct net *net,
1620 struct sockaddr *sin, int len,
1621 int flags)
1622 {
1623 struct svc_sock *svsk;
1624 struct svc_xprt *xprt;
1625
1626 if (protocol != IPPROTO_TCP) {
1627 printk(KERN_WARNING "svc: only TCP sockets"
1628 " supported on shared back channel\n");
1629 return ERR_PTR(-EINVAL);
1630 }
1631
1632 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1633 if (!svsk)
1634 return ERR_PTR(-ENOMEM);
1635
1636 xprt = &svsk->sk_xprt;
1637 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1638 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1639
1640 serv->sv_bc_xprt = xprt;
1641
1642 return xprt;
1643 }
1644
1645 /*
1646 * Free a back channel svc_sock.
1647 */
1648 static void svc_bc_sock_free(struct svc_xprt *xprt)
1649 {
1650 if (xprt)
1651 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1652 }
1653 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
Linux with added FPC-III support