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Linux 4.16-rc1
[cris-mirror.git] / net / sunrpc / svcsock.c
blob943f2a745cd500a46988db079ec426691f2cb5c2
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 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, iov, nr, buflen);
342 len = sock_recvmsg(svsk->sk_sock, &msg, 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 lock_sock(sock->sk);
388 sock->sk->sk_sndbuf = snd * 2;
389 sock->sk->sk_rcvbuf = rcv * 2;
390 sock->sk->sk_write_space(sock->sk);
391 release_sock(sock->sk);
392 }
393
394 static int svc_sock_secure_port(struct svc_rqst *rqstp)
395 {
396 return svc_port_is_privileged(svc_addr(rqstp));
397 }
398
399 /*
400 * INET callback when data has been received on the socket.
401 */
402 static void svc_data_ready(struct sock *sk)
403 {
404 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
405
406 if (svsk) {
407 dprintk("svc: socket %p(inet %p), busy=%d\n",
408 svsk, sk,
409 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
410
411 /* Refer to svc_setup_socket() for details. */
412 rmb();
413 svsk->sk_odata(sk);
414 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
415 svc_xprt_enqueue(&svsk->sk_xprt);
416 }
417 }
418
419 /*
420 * INET callback when space is newly available on the socket.
421 */
422 static void svc_write_space(struct sock *sk)
423 {
424 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
425
426 if (svsk) {
427 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
428 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
429
430 /* Refer to svc_setup_socket() for details. */
431 rmb();
432 svsk->sk_owspace(sk);
433 svc_xprt_enqueue(&svsk->sk_xprt);
434 }
435 }
436
437 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
438 {
439 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
440
441 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
442 return 1;
443 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
444 }
445
446 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
447 {
448 struct svc_sock *svsk;
449 struct socket *sock;
450 struct linger no_linger = {
451 .l_onoff = 1,
452 .l_linger = 0,
453 };
454
455 svsk = container_of(xprt, struct svc_sock, sk_xprt);
456 sock = svsk->sk_sock;
457 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
458 (char *)&no_linger, sizeof(no_linger));
459 }
460
461 /*
462 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
463 */
464 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
465 struct cmsghdr *cmh)
466 {
467 struct in_pktinfo *pki = CMSG_DATA(cmh);
468 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
469
470 if (cmh->cmsg_type != IP_PKTINFO)
471 return 0;
472
473 daddr->sin_family = AF_INET;
474 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
475 return 1;
476 }
477
478 /*
479 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
480 */
481 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
482 struct cmsghdr *cmh)
483 {
484 struct in6_pktinfo *pki = CMSG_DATA(cmh);
485 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
486
487 if (cmh->cmsg_type != IPV6_PKTINFO)
488 return 0;
489
490 daddr->sin6_family = AF_INET6;
491 daddr->sin6_addr = pki->ipi6_addr;
492 daddr->sin6_scope_id = pki->ipi6_ifindex;
493 return 1;
494 }
495
496 /*
497 * Copy the UDP datagram's destination address to the rqstp structure.
498 * The 'destination' address in this case is the address to which the
499 * peer sent the datagram, i.e. our local address. For multihomed
500 * hosts, this can change from msg to msg. Note that only the IP
501 * address changes, the port number should remain the same.
502 */
503 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
504 struct cmsghdr *cmh)
505 {
506 switch (cmh->cmsg_level) {
507 case SOL_IP:
508 return svc_udp_get_dest_address4(rqstp, cmh);
509 case SOL_IPV6:
510 return svc_udp_get_dest_address6(rqstp, cmh);
511 }
512
513 return 0;
514 }
515
516 /*
517 * Receive a datagram from a UDP socket.
518 */
519 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
520 {
521 struct svc_sock *svsk =
522 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
523 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
524 struct sk_buff *skb;
525 union {
526 struct cmsghdr hdr;
527 long all[SVC_PKTINFO_SPACE / sizeof(long)];
528 } buffer;
529 struct cmsghdr *cmh = &buffer.hdr;
530 struct msghdr msg = {
531 .msg_name = svc_addr(rqstp),
532 .msg_control = cmh,
533 .msg_controllen = sizeof(buffer),
534 .msg_flags = MSG_DONTWAIT,
535 };
536 size_t len;
537 int err;
538
539 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
540 /* udp sockets need large rcvbuf as all pending
541 * requests are still in that buffer. sndbuf must
542 * also be large enough that there is enough space
543 * for one reply per thread. We count all threads
544 * rather than threads in a particular pool, which
545 * provides an upper bound on the number of threads
546 * which will access the socket.
547 */
548 svc_sock_setbufsize(svsk->sk_sock,
549 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
550 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
551
552 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
553 skb = NULL;
554 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
555 0, 0, MSG_PEEK | MSG_DONTWAIT);
556 if (err >= 0)
557 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
558
559 if (skb == NULL) {
560 if (err != -EAGAIN) {
561 /* possibly an icmp error */
562 dprintk("svc: recvfrom returned error %d\n", -err);
563 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
564 }
565 return 0;
566 }
567 len = svc_addr_len(svc_addr(rqstp));
568 rqstp->rq_addrlen = len;
569 if (skb->tstamp == 0) {
570 skb->tstamp = ktime_get_real();
571 /* Don't enable netstamp, sunrpc doesn't
572 need that much accuracy */
573 }
574 svsk->sk_sk->sk_stamp = skb->tstamp;
575 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
576
577 len = skb->len;
578 rqstp->rq_arg.len = len;
579
580 rqstp->rq_prot = IPPROTO_UDP;
581
582 if (!svc_udp_get_dest_address(rqstp, cmh)) {
583 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
584 cmh->cmsg_level, cmh->cmsg_type);
585 goto out_free;
586 }
587 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
588
589 if (skb_is_nonlinear(skb)) {
590 /* we have to copy */
591 local_bh_disable();
592 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
593 local_bh_enable();
594 /* checksum error */
595 goto out_free;
596 }
597 local_bh_enable();
598 consume_skb(skb);
599 } else {
600 /* we can use it in-place */
601 rqstp->rq_arg.head[0].iov_base = skb->data;
602 rqstp->rq_arg.head[0].iov_len = len;
603 if (skb_checksum_complete(skb))
604 goto out_free;
605 rqstp->rq_xprt_ctxt = skb;
606 }
607
608 rqstp->rq_arg.page_base = 0;
609 if (len <= rqstp->rq_arg.head[0].iov_len) {
610 rqstp->rq_arg.head[0].iov_len = len;
611 rqstp->rq_arg.page_len = 0;
612 rqstp->rq_respages = rqstp->rq_pages+1;
613 } else {
614 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
615 rqstp->rq_respages = rqstp->rq_pages + 1 +
616 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
617 }
618 rqstp->rq_next_page = rqstp->rq_respages+1;
619
620 if (serv->sv_stats)
621 serv->sv_stats->netudpcnt++;
622
623 return len;
624 out_free:
625 kfree_skb(skb);
626 return 0;
627 }
628
629 static int
630 svc_udp_sendto(struct svc_rqst *rqstp)
631 {
632 int error;
633
634 error = svc_sendto(rqstp, &rqstp->rq_res);
635 if (error == -ECONNREFUSED)
636 /* ICMP error on earlier request. */
637 error = svc_sendto(rqstp, &rqstp->rq_res);
638
639 return error;
640 }
641
642 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
643 {
644 }
645
646 static int svc_udp_has_wspace(struct svc_xprt *xprt)
647 {
648 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
649 struct svc_serv *serv = xprt->xpt_server;
650 unsigned long required;
651
652 /*
653 * Set the SOCK_NOSPACE flag before checking the available
654 * sock space.
655 */
656 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
657 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
658 if (required*2 > sock_wspace(svsk->sk_sk))
659 return 0;
660 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
661 return 1;
662 }
663
664 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
665 {
666 BUG();
667 return NULL;
668 }
669
670 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
671 {
672 }
673
674 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
675 struct net *net,
676 struct sockaddr *sa, int salen,
677 int flags)
678 {
679 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
680 }
681
682 static const struct svc_xprt_ops svc_udp_ops = {
683 .xpo_create = svc_udp_create,
684 .xpo_recvfrom = svc_udp_recvfrom,
685 .xpo_sendto = svc_udp_sendto,
686 .xpo_release_rqst = svc_release_udp_skb,
687 .xpo_detach = svc_sock_detach,
688 .xpo_free = svc_sock_free,
689 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
690 .xpo_has_wspace = svc_udp_has_wspace,
691 .xpo_accept = svc_udp_accept,
692 .xpo_secure_port = svc_sock_secure_port,
693 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
694 };
695
696 static struct svc_xprt_class svc_udp_class = {
697 .xcl_name = "udp",
698 .xcl_owner = THIS_MODULE,
699 .xcl_ops = &svc_udp_ops,
700 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
701 .xcl_ident = XPRT_TRANSPORT_UDP,
702 };
703
704 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
705 {
706 int err, level, optname, one = 1;
707
708 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
709 &svsk->sk_xprt, serv);
710 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
711 svsk->sk_sk->sk_data_ready = svc_data_ready;
712 svsk->sk_sk->sk_write_space = svc_write_space;
713
714 /* initialise setting must have enough space to
715 * receive and respond to one request.
716 * svc_udp_recvfrom will re-adjust if necessary
717 */
718 svc_sock_setbufsize(svsk->sk_sock,
719 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
720 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
721
722 /* data might have come in before data_ready set up */
723 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
724 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
725
726 /* make sure we get destination address info */
727 switch (svsk->sk_sk->sk_family) {
728 case AF_INET:
729 level = SOL_IP;
730 optname = IP_PKTINFO;
731 break;
732 case AF_INET6:
733 level = SOL_IPV6;
734 optname = IPV6_RECVPKTINFO;
735 break;
736 default:
737 BUG();
738 }
739 err = kernel_setsockopt(svsk->sk_sock, level, optname,
740 (char *)&one, sizeof(one));
741 dprintk("svc: kernel_setsockopt returned %d\n", err);
742 }
743
744 /*
745 * A data_ready event on a listening socket means there's a connection
746 * pending. Do not use state_change as a substitute for it.
747 */
748 static void svc_tcp_listen_data_ready(struct sock *sk)
749 {
750 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
751
752 dprintk("svc: socket %p TCP (listen) state change %d\n",
753 sk, sk->sk_state);
754
755 if (svsk) {
756 /* Refer to svc_setup_socket() for details. */
757 rmb();
758 svsk->sk_odata(sk);
759 }
760
761 /*
762 * This callback may called twice when a new connection
763 * is established as a child socket inherits everything
764 * from a parent LISTEN socket.
765 * 1) data_ready method of the parent socket will be called
766 * when one of child sockets become ESTABLISHED.
767 * 2) data_ready method of the child socket may be called
768 * when it receives data before the socket is accepted.
769 * In case of 2, we should ignore it silently.
770 */
771 if (sk->sk_state == TCP_LISTEN) {
772 if (svsk) {
773 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
774 svc_xprt_enqueue(&svsk->sk_xprt);
775 } else
776 printk("svc: socket %p: no user data\n", sk);
777 }
778 }
779
780 /*
781 * A state change on a connected socket means it's dying or dead.
782 */
783 static void svc_tcp_state_change(struct sock *sk)
784 {
785 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
786
787 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
788 sk, sk->sk_state, sk->sk_user_data);
789
790 if (!svsk)
791 printk("svc: socket %p: no user data\n", sk);
792 else {
793 /* Refer to svc_setup_socket() for details. */
794 rmb();
795 svsk->sk_ostate(sk);
796 if (sk->sk_state != TCP_ESTABLISHED) {
797 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
798 svc_xprt_enqueue(&svsk->sk_xprt);
799 }
800 }
801 }
802
803 /*
804 * Accept a TCP connection
805 */
806 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
807 {
808 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
809 struct sockaddr_storage addr;
810 struct sockaddr *sin = (struct sockaddr *) &addr;
811 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
812 struct socket *sock = svsk->sk_sock;
813 struct socket *newsock;
814 struct svc_sock *newsvsk;
815 int err, slen;
816 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
817
818 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
819 if (!sock)
820 return NULL;
821
822 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
823 err = kernel_accept(sock, &newsock, O_NONBLOCK);
824 if (err < 0) {
825 if (err == -ENOMEM)
826 printk(KERN_WARNING "%s: no more sockets!\n",
827 serv->sv_name);
828 else if (err != -EAGAIN)
829 net_warn_ratelimited("%s: accept failed (err %d)!\n",
830 serv->sv_name, -err);
831 return NULL;
832 }
833 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
834
835 err = kernel_getpeername(newsock, sin, &slen);
836 if (err < 0) {
837 net_warn_ratelimited("%s: peername failed (err %d)!\n",
838 serv->sv_name, -err);
839 goto failed; /* aborted connection or whatever */
840 }
841
842 /* Ideally, we would want to reject connections from unauthorized
843 * hosts here, but when we get encryption, the IP of the host won't
844 * tell us anything. For now just warn about unpriv connections.
845 */
846 if (!svc_port_is_privileged(sin)) {
847 dprintk("%s: connect from unprivileged port: %s\n",
848 serv->sv_name,
849 __svc_print_addr(sin, buf, sizeof(buf)));
850 }
851 dprintk("%s: connect from %s\n", serv->sv_name,
852 __svc_print_addr(sin, buf, sizeof(buf)));
853
854 /* Reset the inherited callbacks before calling svc_setup_socket */
855 newsock->sk->sk_state_change = svsk->sk_ostate;
856 newsock->sk->sk_data_ready = svsk->sk_odata;
857 newsock->sk->sk_write_space = svsk->sk_owspace;
858
859 /* make sure that a write doesn't block forever when
860 * low on memory
861 */
862 newsock->sk->sk_sndtimeo = HZ*30;
863
864 newsvsk = svc_setup_socket(serv, newsock,
865 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
866 if (IS_ERR(newsvsk))
867 goto failed;
868 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
869 err = kernel_getsockname(newsock, sin, &slen);
870 if (unlikely(err < 0)) {
871 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
872 slen = offsetof(struct sockaddr, sa_data);
873 }
874 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
875
876 if (sock_is_loopback(newsock->sk))
877 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
878 else
879 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
880 if (serv->sv_stats)
881 serv->sv_stats->nettcpconn++;
882
883 return &newsvsk->sk_xprt;
884
885 failed:
886 sock_release(newsock);
887 return NULL;
888 }
889
890 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
891 {
892 unsigned int i, len, npages;
893
894 if (svsk->sk_datalen == 0)
895 return 0;
896 len = svsk->sk_datalen;
897 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
898 for (i = 0; i < npages; i++) {
899 if (rqstp->rq_pages[i] != NULL)
900 put_page(rqstp->rq_pages[i]);
901 BUG_ON(svsk->sk_pages[i] == NULL);
902 rqstp->rq_pages[i] = svsk->sk_pages[i];
903 svsk->sk_pages[i] = NULL;
904 }
905 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
906 return len;
907 }
908
909 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
910 {
911 unsigned int i, len, npages;
912
913 if (svsk->sk_datalen == 0)
914 return;
915 len = svsk->sk_datalen;
916 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
917 for (i = 0; i < npages; i++) {
918 svsk->sk_pages[i] = rqstp->rq_pages[i];
919 rqstp->rq_pages[i] = NULL;
920 }
921 }
922
923 static void svc_tcp_clear_pages(struct svc_sock *svsk)
924 {
925 unsigned int i, len, npages;
926
927 if (svsk->sk_datalen == 0)
928 goto out;
929 len = svsk->sk_datalen;
930 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
931 for (i = 0; i < npages; i++) {
932 if (svsk->sk_pages[i] == NULL) {
933 WARN_ON_ONCE(1);
934 continue;
935 }
936 put_page(svsk->sk_pages[i]);
937 svsk->sk_pages[i] = NULL;
938 }
939 out:
940 svsk->sk_tcplen = 0;
941 svsk->sk_datalen = 0;
942 }
943
944 /*
945 * Receive fragment record header.
946 * If we haven't gotten the record length yet, get the next four bytes.
947 */
948 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
949 {
950 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
951 unsigned int want;
952 int len;
953
954 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
955 struct kvec iov;
956
957 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
958 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
959 iov.iov_len = want;
960 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
961 goto error;
962 svsk->sk_tcplen += len;
963
964 if (len < want) {
965 dprintk("svc: short recvfrom while reading record "
966 "length (%d of %d)\n", len, want);
967 return -EAGAIN;
968 }
969
970 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
971 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
972 serv->sv_max_mesg) {
973 net_notice_ratelimited("RPC: fragment too large: %d\n",
974 svc_sock_reclen(svsk));
975 goto err_delete;
976 }
977 }
978
979 return svc_sock_reclen(svsk);
980 error:
981 dprintk("RPC: TCP recv_record got %d\n", len);
982 return len;
983 err_delete:
984 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
985 return -EAGAIN;
986 }
987
988 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
989 {
990 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
991 struct rpc_rqst *req = NULL;
992 struct kvec *src, *dst;
993 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
994 __be32 xid;
995 __be32 calldir;
996
997 xid = *p++;
998 calldir = *p;
999
1000 if (!bc_xprt)
1001 return -EAGAIN;
1002 spin_lock(&bc_xprt->recv_lock);
1003 req = xprt_lookup_rqst(bc_xprt, xid);
1004 if (!req)
1005 goto unlock_notfound;
1006
1007 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1008 /*
1009 * XXX!: cheating for now! Only copying HEAD.
1010 * But we know this is good enough for now (in fact, for any
1011 * callback reply in the forseeable future).
1012 */
1013 dst = &req->rq_private_buf.head[0];
1014 src = &rqstp->rq_arg.head[0];
1015 if (dst->iov_len < src->iov_len)
1016 goto unlock_eagain; /* whatever; just giving up. */
1017 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1018 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1019 rqstp->rq_arg.len = 0;
1020 spin_unlock(&bc_xprt->recv_lock);
1021 return 0;
1022 unlock_notfound:
1023 printk(KERN_NOTICE
1024 "%s: Got unrecognized reply: "
1025 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1026 __func__, ntohl(calldir),
1027 bc_xprt, ntohl(xid));
1028 unlock_eagain:
1029 spin_unlock(&bc_xprt->recv_lock);
1030 return -EAGAIN;
1031 }
1032
1033 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1034 {
1035 int i = 0;
1036 int t = 0;
1037
1038 while (t < len) {
1039 vec[i].iov_base = page_address(pages[i]);
1040 vec[i].iov_len = PAGE_SIZE;
1041 i++;
1042 t += PAGE_SIZE;
1043 }
1044 return i;
1045 }
1046
1047 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1048 {
1049 /* If we have more data, signal svc_xprt_enqueue() to try again */
1050 dprintk("svc: TCP %s record (%d bytes)\n",
1051 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1052 svc_sock_reclen(svsk));
1053 svsk->sk_tcplen = 0;
1054 svsk->sk_reclen = 0;
1055 }
1056
1057 /*
1058 * Receive data from a TCP socket.
1059 */
1060 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1061 {
1062 struct svc_sock *svsk =
1063 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1064 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1065 int len;
1066 struct kvec *vec;
1067 unsigned int want, base;
1068 __be32 *p;
1069 __be32 calldir;
1070 int pnum;
1071
1072 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1073 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1074 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1075 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1076
1077 len = svc_tcp_recv_record(svsk, rqstp);
1078 if (len < 0)
1079 goto error;
1080
1081 base = svc_tcp_restore_pages(svsk, rqstp);
1082 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1083
1084 vec = rqstp->rq_vec;
1085
1086 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1087 svsk->sk_datalen + want);
1088
1089 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1090 rqstp->rq_next_page = rqstp->rq_respages + 1;
1091
1092 /* Now receive data */
1093 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1094 if (len >= 0) {
1095 svsk->sk_tcplen += len;
1096 svsk->sk_datalen += len;
1097 }
1098 if (len != want || !svc_sock_final_rec(svsk)) {
1099 svc_tcp_save_pages(svsk, rqstp);
1100 if (len < 0 && len != -EAGAIN)
1101 goto err_delete;
1102 if (len == want)
1103 svc_tcp_fragment_received(svsk);
1104 else
1105 dprintk("svc: incomplete TCP record (%d of %d)\n",
1106 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1107 svc_sock_reclen(svsk));
1108 goto err_noclose;
1109 }
1110
1111 if (svsk->sk_datalen < 8) {
1112 svsk->sk_datalen = 0;
1113 goto err_delete; /* client is nuts. */
1114 }
1115
1116 rqstp->rq_arg.len = svsk->sk_datalen;
1117 rqstp->rq_arg.page_base = 0;
1118 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1119 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1120 rqstp->rq_arg.page_len = 0;
1121 } else
1122 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1123
1124 rqstp->rq_xprt_ctxt = NULL;
1125 rqstp->rq_prot = IPPROTO_TCP;
1126 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1127 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1128 else
1129 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1130
1131 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1132 calldir = p[1];
1133 if (calldir)
1134 len = receive_cb_reply(svsk, rqstp);
1135
1136 /* Reset TCP read info */
1137 svsk->sk_datalen = 0;
1138 svc_tcp_fragment_received(svsk);
1139
1140 if (len < 0)
1141 goto error;
1142
1143 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1144 if (serv->sv_stats)
1145 serv->sv_stats->nettcpcnt++;
1146
1147 return rqstp->rq_arg.len;
1148
1149 error:
1150 if (len != -EAGAIN)
1151 goto err_delete;
1152 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1153 return 0;
1154 err_delete:
1155 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1156 svsk->sk_xprt.xpt_server->sv_name, -len);
1157 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1158 err_noclose:
1159 return 0; /* record not complete */
1160 }
1161
1162 /*
1163 * Send out data on TCP socket.
1164 */
1165 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1166 {
1167 struct xdr_buf *xbufp = &rqstp->rq_res;
1168 int sent;
1169 __be32 reclen;
1170
1171 /* Set up the first element of the reply kvec.
1172 * Any other kvecs that may be in use have been taken
1173 * care of by the server implementation itself.
1174 */
1175 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1176 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1177
1178 sent = svc_sendto(rqstp, &rqstp->rq_res);
1179 if (sent != xbufp->len) {
1180 printk(KERN_NOTICE
1181 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1182 "- shutting down socket\n",
1183 rqstp->rq_xprt->xpt_server->sv_name,
1184 (sent<0)?"got error":"sent only",
1185 sent, xbufp->len);
1186 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1187 svc_xprt_enqueue(rqstp->rq_xprt);
1188 sent = -EAGAIN;
1189 }
1190 return sent;
1191 }
1192
1193 /*
1194 * Setup response header. TCP has a 4B record length field.
1195 */
1196 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1197 {
1198 struct kvec *resv = &rqstp->rq_res.head[0];
1199
1200 /* tcp needs a space for the record length... */
1201 svc_putnl(resv, 0);
1202 }
1203
1204 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1205 struct net *net,
1206 struct sockaddr *sa, int salen,
1207 int flags)
1208 {
1209 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1210 }
1211
1212 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1213 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1214 struct net *, struct sockaddr *,
1215 int, int);
1216 static void svc_bc_sock_free(struct svc_xprt *xprt);
1217
1218 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1219 struct net *net,
1220 struct sockaddr *sa, int salen,
1221 int flags)
1222 {
1223 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1224 }
1225
1226 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1227 {
1228 }
1229
1230 static const struct svc_xprt_ops svc_tcp_bc_ops = {
1231 .xpo_create = svc_bc_tcp_create,
1232 .xpo_detach = svc_bc_tcp_sock_detach,
1233 .xpo_free = svc_bc_sock_free,
1234 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1235 .xpo_secure_port = svc_sock_secure_port,
1236 };
1237
1238 static struct svc_xprt_class svc_tcp_bc_class = {
1239 .xcl_name = "tcp-bc",
1240 .xcl_owner = THIS_MODULE,
1241 .xcl_ops = &svc_tcp_bc_ops,
1242 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1243 };
1244
1245 static void svc_init_bc_xprt_sock(void)
1246 {
1247 svc_reg_xprt_class(&svc_tcp_bc_class);
1248 }
1249
1250 static void svc_cleanup_bc_xprt_sock(void)
1251 {
1252 svc_unreg_xprt_class(&svc_tcp_bc_class);
1253 }
1254 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1255 static void svc_init_bc_xprt_sock(void)
1256 {
1257 }
1258
1259 static void svc_cleanup_bc_xprt_sock(void)
1260 {
1261 }
1262 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1263
1264 static const struct svc_xprt_ops svc_tcp_ops = {
1265 .xpo_create = svc_tcp_create,
1266 .xpo_recvfrom = svc_tcp_recvfrom,
1267 .xpo_sendto = svc_tcp_sendto,
1268 .xpo_release_rqst = svc_release_skb,
1269 .xpo_detach = svc_tcp_sock_detach,
1270 .xpo_free = svc_sock_free,
1271 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1272 .xpo_has_wspace = svc_tcp_has_wspace,
1273 .xpo_accept = svc_tcp_accept,
1274 .xpo_secure_port = svc_sock_secure_port,
1275 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1276 };
1277
1278 static struct svc_xprt_class svc_tcp_class = {
1279 .xcl_name = "tcp",
1280 .xcl_owner = THIS_MODULE,
1281 .xcl_ops = &svc_tcp_ops,
1282 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1283 .xcl_ident = XPRT_TRANSPORT_TCP,
1284 };
1285
1286 void svc_init_xprt_sock(void)
1287 {
1288 svc_reg_xprt_class(&svc_tcp_class);
1289 svc_reg_xprt_class(&svc_udp_class);
1290 svc_init_bc_xprt_sock();
1291 }
1292
1293 void svc_cleanup_xprt_sock(void)
1294 {
1295 svc_unreg_xprt_class(&svc_tcp_class);
1296 svc_unreg_xprt_class(&svc_udp_class);
1297 svc_cleanup_bc_xprt_sock();
1298 }
1299
1300 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1301 {
1302 struct sock *sk = svsk->sk_sk;
1303
1304 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1305 &svsk->sk_xprt, serv);
1306 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1307 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1308 if (sk->sk_state == TCP_LISTEN) {
1309 dprintk("setting up TCP socket for listening\n");
1310 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1311 sk->sk_data_ready = svc_tcp_listen_data_ready;
1312 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1313 } else {
1314 dprintk("setting up TCP socket for reading\n");
1315 sk->sk_state_change = svc_tcp_state_change;
1316 sk->sk_data_ready = svc_data_ready;
1317 sk->sk_write_space = svc_write_space;
1318
1319 svsk->sk_reclen = 0;
1320 svsk->sk_tcplen = 0;
1321 svsk->sk_datalen = 0;
1322 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1323
1324 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1325
1326 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1327 switch (sk->sk_state) {
1328 case TCP_SYN_RECV:
1329 case TCP_ESTABLISHED:
1330 break;
1331 default:
1332 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1333 }
1334 }
1335 }
1336
1337 void svc_sock_update_bufs(struct svc_serv *serv)
1338 {
1339 /*
1340 * The number of server threads has changed. Update
1341 * rcvbuf and sndbuf accordingly on all sockets
1342 */
1343 struct svc_sock *svsk;
1344
1345 spin_lock_bh(&serv->sv_lock);
1346 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1347 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1348 spin_unlock_bh(&serv->sv_lock);
1349 }
1350 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1351
1352 /*
1353 * Initialize socket for RPC use and create svc_sock struct
1354 */
1355 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1356 struct socket *sock,
1357 int flags)
1358 {
1359 struct svc_sock *svsk;
1360 struct sock *inet;
1361 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1362 int err = 0;
1363
1364 dprintk("svc: svc_setup_socket %p\n", sock);
1365 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1366 if (!svsk)
1367 return ERR_PTR(-ENOMEM);
1368
1369 inet = sock->sk;
1370
1371 /* Register socket with portmapper */
1372 if (pmap_register)
1373 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1374 inet->sk_protocol,
1375 ntohs(inet_sk(inet)->inet_sport));
1376
1377 if (err < 0) {
1378 kfree(svsk);
1379 return ERR_PTR(err);
1380 }
1381
1382 svsk->sk_sock = sock;
1383 svsk->sk_sk = inet;
1384 svsk->sk_ostate = inet->sk_state_change;
1385 svsk->sk_odata = inet->sk_data_ready;
1386 svsk->sk_owspace = inet->sk_write_space;
1387 /*
1388 * This barrier is necessary in order to prevent race condition
1389 * with svc_data_ready(), svc_listen_data_ready() and others
1390 * when calling callbacks above.
1391 */
1392 wmb();
1393 inet->sk_user_data = svsk;
1394
1395 /* Initialize the socket */
1396 if (sock->type == SOCK_DGRAM)
1397 svc_udp_init(svsk, serv);
1398 else
1399 svc_tcp_init(svsk, serv);
1400
1401 dprintk("svc: svc_setup_socket created %p (inet %p), "
1402 "listen %d close %d\n",
1403 svsk, svsk->sk_sk,
1404 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1405 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1406
1407 return svsk;
1408 }
1409
1410 bool svc_alien_sock(struct net *net, int fd)
1411 {
1412 int err;
1413 struct socket *sock = sockfd_lookup(fd, &err);
1414 bool ret = false;
1415
1416 if (!sock)
1417 goto out;
1418 if (sock_net(sock->sk) != net)
1419 ret = true;
1420 sockfd_put(sock);
1421 out:
1422 return ret;
1423 }
1424 EXPORT_SYMBOL_GPL(svc_alien_sock);
1425
1426 /**
1427 * svc_addsock - add a listener socket to an RPC service
1428 * @serv: pointer to RPC service to which to add a new listener
1429 * @fd: file descriptor of the new listener
1430 * @name_return: pointer to buffer to fill in with name of listener
1431 * @len: size of the buffer
1432 *
1433 * Fills in socket name and returns positive length of name if successful.
1434 * Name is terminated with '\n'. On error, returns a negative errno
1435 * value.
1436 */
1437 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1438 const size_t len)
1439 {
1440 int err = 0;
1441 struct socket *so = sockfd_lookup(fd, &err);
1442 struct svc_sock *svsk = NULL;
1443 struct sockaddr_storage addr;
1444 struct sockaddr *sin = (struct sockaddr *)&addr;
1445 int salen;
1446
1447 if (!so)
1448 return err;
1449 err = -EAFNOSUPPORT;
1450 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1451 goto out;
1452 err = -EPROTONOSUPPORT;
1453 if (so->sk->sk_protocol != IPPROTO_TCP &&
1454 so->sk->sk_protocol != IPPROTO_UDP)
1455 goto out;
1456 err = -EISCONN;
1457 if (so->state > SS_UNCONNECTED)
1458 goto out;
1459 err = -ENOENT;
1460 if (!try_module_get(THIS_MODULE))
1461 goto out;
1462 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1463 if (IS_ERR(svsk)) {
1464 module_put(THIS_MODULE);
1465 err = PTR_ERR(svsk);
1466 goto out;
1467 }
1468 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1469 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1470 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1471 return svc_one_sock_name(svsk, name_return, len);
1472 out:
1473 sockfd_put(so);
1474 return err;
1475 }
1476 EXPORT_SYMBOL_GPL(svc_addsock);
1477
1478 /*
1479 * Create socket for RPC service.
1480 */
1481 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1482 int protocol,
1483 struct net *net,
1484 struct sockaddr *sin, int len,
1485 int flags)
1486 {
1487 struct svc_sock *svsk;
1488 struct socket *sock;
1489 int error;
1490 int type;
1491 struct sockaddr_storage addr;
1492 struct sockaddr *newsin = (struct sockaddr *)&addr;
1493 int newlen;
1494 int family;
1495 int val;
1496 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1497
1498 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1499 serv->sv_program->pg_name, protocol,
1500 __svc_print_addr(sin, buf, sizeof(buf)));
1501
1502 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1503 printk(KERN_WARNING "svc: only UDP and TCP "
1504 "sockets supported\n");
1505 return ERR_PTR(-EINVAL);
1506 }
1507
1508 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1509 switch (sin->sa_family) {
1510 case AF_INET6:
1511 family = PF_INET6;
1512 break;
1513 case AF_INET:
1514 family = PF_INET;
1515 break;
1516 default:
1517 return ERR_PTR(-EINVAL);
1518 }
1519
1520 error = __sock_create(net, family, type, protocol, &sock, 1);
1521 if (error < 0)
1522 return ERR_PTR(error);
1523
1524 svc_reclassify_socket(sock);
1525
1526 /*
1527 * If this is an PF_INET6 listener, we want to avoid
1528 * getting requests from IPv4 remotes. Those should
1529 * be shunted to a PF_INET listener via rpcbind.
1530 */
1531 val = 1;
1532 if (family == PF_INET6)
1533 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1534 (char *)&val, sizeof(val));
1535
1536 if (type == SOCK_STREAM)
1537 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1538 error = kernel_bind(sock, sin, len);
1539 if (error < 0)
1540 goto bummer;
1541
1542 newlen = len;
1543 error = kernel_getsockname(sock, newsin, &newlen);
1544 if (error < 0)
1545 goto bummer;
1546
1547 if (protocol == IPPROTO_TCP) {
1548 if ((error = kernel_listen(sock, 64)) < 0)
1549 goto bummer;
1550 }
1551
1552 svsk = svc_setup_socket(serv, sock, flags);
1553 if (IS_ERR(svsk)) {
1554 error = PTR_ERR(svsk);
1555 goto bummer;
1556 }
1557 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1558 return (struct svc_xprt *)svsk;
1559 bummer:
1560 dprintk("svc: svc_create_socket error = %d\n", -error);
1561 sock_release(sock);
1562 return ERR_PTR(error);
1563 }
1564
1565 /*
1566 * Detach the svc_sock from the socket so that no
1567 * more callbacks occur.
1568 */
1569 static void svc_sock_detach(struct svc_xprt *xprt)
1570 {
1571 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1572 struct sock *sk = svsk->sk_sk;
1573
1574 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1575
1576 /* put back the old socket callbacks */
1577 lock_sock(sk);
1578 sk->sk_state_change = svsk->sk_ostate;
1579 sk->sk_data_ready = svsk->sk_odata;
1580 sk->sk_write_space = svsk->sk_owspace;
1581 sk->sk_user_data = NULL;
1582 release_sock(sk);
1583 }
1584
1585 /*
1586 * Disconnect the socket, and reset the callbacks
1587 */
1588 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1589 {
1590 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1591
1592 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1593
1594 svc_sock_detach(xprt);
1595
1596 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1597 svc_tcp_clear_pages(svsk);
1598 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1599 }
1600 }
1601
1602 /*
1603 * Free the svc_sock's socket resources and the svc_sock itself.
1604 */
1605 static void svc_sock_free(struct svc_xprt *xprt)
1606 {
1607 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1608 dprintk("svc: svc_sock_free(%p)\n", svsk);
1609
1610 if (svsk->sk_sock->file)
1611 sockfd_put(svsk->sk_sock);
1612 else
1613 sock_release(svsk->sk_sock);
1614 kfree(svsk);
1615 }
1616
1617 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1618 /*
1619 * Create a back channel svc_xprt which shares the fore channel socket.
1620 */
1621 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1622 int protocol,
1623 struct net *net,
1624 struct sockaddr *sin, int len,
1625 int flags)
1626 {
1627 struct svc_sock *svsk;
1628 struct svc_xprt *xprt;
1629
1630 if (protocol != IPPROTO_TCP) {
1631 printk(KERN_WARNING "svc: only TCP sockets"
1632 " supported on shared back channel\n");
1633 return ERR_PTR(-EINVAL);
1634 }
1635
1636 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1637 if (!svsk)
1638 return ERR_PTR(-ENOMEM);
1639
1640 xprt = &svsk->sk_xprt;
1641 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1642 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1643
1644 serv->sv_bc_xprt = xprt;
1645
1646 return xprt;
1647 }
1648
1649 /*
1650 * Free a back channel svc_sock.
1651 */
1652 static void svc_bc_sock_free(struct svc_xprt *xprt)
1653 {
1654 if (xprt)
1655 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1656 }
1657 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
CRIS linux kernel tree