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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / net / sunrpc / svcsock.c
blobdb8bb6b3a2b0faf387868b80539c33ae9c5626dd
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 void svc_sock_secure_port(struct svc_rqst *rqstp)
395 {
396 if (svc_port_is_privileged(svc_addr(rqstp)))
397 set_bit(RQ_SECURE, &rqstp->rq_flags);
398 else
399 clear_bit(RQ_SECURE, &rqstp->rq_flags);
400 }
401
402 /*
403 * INET callback when data has been received on the socket.
404 */
405 static void svc_data_ready(struct sock *sk)
406 {
407 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
408
409 if (svsk) {
410 dprintk("svc: socket %p(inet %p), busy=%d\n",
411 svsk, sk,
412 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
413
414 /* Refer to svc_setup_socket() for details. */
415 rmb();
416 svsk->sk_odata(sk);
417 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
418 svc_xprt_enqueue(&svsk->sk_xprt);
419 }
420 }
421
422 /*
423 * INET callback when space is newly available on the socket.
424 */
425 static void svc_write_space(struct sock *sk)
426 {
427 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
428
429 if (svsk) {
430 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
431 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
432
433 /* Refer to svc_setup_socket() for details. */
434 rmb();
435 svsk->sk_owspace(sk);
436 svc_xprt_enqueue(&svsk->sk_xprt);
437 }
438 }
439
440 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
441 {
442 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
443
444 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
445 return 1;
446 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
447 }
448
449 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
450 {
451 struct svc_sock *svsk;
452 struct socket *sock;
453 struct linger no_linger = {
454 .l_onoff = 1,
455 .l_linger = 0,
456 };
457
458 svsk = container_of(xprt, struct svc_sock, sk_xprt);
459 sock = svsk->sk_sock;
460 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
461 (char *)&no_linger, sizeof(no_linger));
462 }
463
464 /*
465 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
466 */
467 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
468 struct cmsghdr *cmh)
469 {
470 struct in_pktinfo *pki = CMSG_DATA(cmh);
471 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
472
473 if (cmh->cmsg_type != IP_PKTINFO)
474 return 0;
475
476 daddr->sin_family = AF_INET;
477 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
478 return 1;
479 }
480
481 /*
482 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
483 */
484 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
485 struct cmsghdr *cmh)
486 {
487 struct in6_pktinfo *pki = CMSG_DATA(cmh);
488 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
489
490 if (cmh->cmsg_type != IPV6_PKTINFO)
491 return 0;
492
493 daddr->sin6_family = AF_INET6;
494 daddr->sin6_addr = pki->ipi6_addr;
495 daddr->sin6_scope_id = pki->ipi6_ifindex;
496 return 1;
497 }
498
499 /*
500 * Copy the UDP datagram's destination address to the rqstp structure.
501 * The 'destination' address in this case is the address to which the
502 * peer sent the datagram, i.e. our local address. For multihomed
503 * hosts, this can change from msg to msg. Note that only the IP
504 * address changes, the port number should remain the same.
505 */
506 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
507 struct cmsghdr *cmh)
508 {
509 switch (cmh->cmsg_level) {
510 case SOL_IP:
511 return svc_udp_get_dest_address4(rqstp, cmh);
512 case SOL_IPV6:
513 return svc_udp_get_dest_address6(rqstp, cmh);
514 }
515
516 return 0;
517 }
518
519 /*
520 * Receive a datagram from a UDP socket.
521 */
522 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
523 {
524 struct svc_sock *svsk =
525 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
526 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
527 struct sk_buff *skb;
528 union {
529 struct cmsghdr hdr;
530 long all[SVC_PKTINFO_SPACE / sizeof(long)];
531 } buffer;
532 struct cmsghdr *cmh = &buffer.hdr;
533 struct msghdr msg = {
534 .msg_name = svc_addr(rqstp),
535 .msg_control = cmh,
536 .msg_controllen = sizeof(buffer),
537 .msg_flags = MSG_DONTWAIT,
538 };
539 size_t len;
540 int err;
541
542 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
543 /* udp sockets need large rcvbuf as all pending
544 * requests are still in that buffer. sndbuf must
545 * also be large enough that there is enough space
546 * for one reply per thread. We count all threads
547 * rather than threads in a particular pool, which
548 * provides an upper bound on the number of threads
549 * which will access the socket.
550 */
551 svc_sock_setbufsize(svsk->sk_sock,
552 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
553 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
554
555 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
556 skb = NULL;
557 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
558 0, 0, MSG_PEEK | MSG_DONTWAIT);
559 if (err >= 0)
560 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
561
562 if (skb == NULL) {
563 if (err != -EAGAIN) {
564 /* possibly an icmp error */
565 dprintk("svc: recvfrom returned error %d\n", -err);
566 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
567 }
568 return 0;
569 }
570 len = svc_addr_len(svc_addr(rqstp));
571 rqstp->rq_addrlen = len;
572 if (skb->tstamp == 0) {
573 skb->tstamp = ktime_get_real();
574 /* Don't enable netstamp, sunrpc doesn't
575 need that much accuracy */
576 }
577 svsk->sk_sk->sk_stamp = skb->tstamp;
578 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
579
580 len = skb->len;
581 rqstp->rq_arg.len = len;
582
583 rqstp->rq_prot = IPPROTO_UDP;
584
585 if (!svc_udp_get_dest_address(rqstp, cmh)) {
586 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
587 cmh->cmsg_level, cmh->cmsg_type);
588 goto out_free;
589 }
590 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
591
592 if (skb_is_nonlinear(skb)) {
593 /* we have to copy */
594 local_bh_disable();
595 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
596 local_bh_enable();
597 /* checksum error */
598 goto out_free;
599 }
600 local_bh_enable();
601 consume_skb(skb);
602 } else {
603 /* we can use it in-place */
604 rqstp->rq_arg.head[0].iov_base = skb->data;
605 rqstp->rq_arg.head[0].iov_len = len;
606 if (skb_checksum_complete(skb))
607 goto out_free;
608 rqstp->rq_xprt_ctxt = skb;
609 }
610
611 rqstp->rq_arg.page_base = 0;
612 if (len <= rqstp->rq_arg.head[0].iov_len) {
613 rqstp->rq_arg.head[0].iov_len = len;
614 rqstp->rq_arg.page_len = 0;
615 rqstp->rq_respages = rqstp->rq_pages+1;
616 } else {
617 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
618 rqstp->rq_respages = rqstp->rq_pages + 1 +
619 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
620 }
621 rqstp->rq_next_page = rqstp->rq_respages+1;
622
623 if (serv->sv_stats)
624 serv->sv_stats->netudpcnt++;
625
626 return len;
627 out_free:
628 kfree_skb(skb);
629 return 0;
630 }
631
632 static int
633 svc_udp_sendto(struct svc_rqst *rqstp)
634 {
635 int error;
636
637 error = svc_sendto(rqstp, &rqstp->rq_res);
638 if (error == -ECONNREFUSED)
639 /* ICMP error on earlier request. */
640 error = svc_sendto(rqstp, &rqstp->rq_res);
641
642 return error;
643 }
644
645 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
646 {
647 }
648
649 static int svc_udp_has_wspace(struct svc_xprt *xprt)
650 {
651 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
652 struct svc_serv *serv = xprt->xpt_server;
653 unsigned long required;
654
655 /*
656 * Set the SOCK_NOSPACE flag before checking the available
657 * sock space.
658 */
659 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
660 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
661 if (required*2 > sock_wspace(svsk->sk_sk))
662 return 0;
663 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
664 return 1;
665 }
666
667 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
668 {
669 BUG();
670 return NULL;
671 }
672
673 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
674 {
675 }
676
677 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
678 struct net *net,
679 struct sockaddr *sa, int salen,
680 int flags)
681 {
682 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
683 }
684
685 static const struct svc_xprt_ops svc_udp_ops = {
686 .xpo_create = svc_udp_create,
687 .xpo_recvfrom = svc_udp_recvfrom,
688 .xpo_sendto = svc_udp_sendto,
689 .xpo_release_rqst = svc_release_udp_skb,
690 .xpo_detach = svc_sock_detach,
691 .xpo_free = svc_sock_free,
692 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
693 .xpo_has_wspace = svc_udp_has_wspace,
694 .xpo_accept = svc_udp_accept,
695 .xpo_secure_port = svc_sock_secure_port,
696 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
697 };
698
699 static struct svc_xprt_class svc_udp_class = {
700 .xcl_name = "udp",
701 .xcl_owner = THIS_MODULE,
702 .xcl_ops = &svc_udp_ops,
703 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
704 .xcl_ident = XPRT_TRANSPORT_UDP,
705 };
706
707 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
708 {
709 int err, level, optname, one = 1;
710
711 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
712 &svsk->sk_xprt, serv);
713 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
714 svsk->sk_sk->sk_data_ready = svc_data_ready;
715 svsk->sk_sk->sk_write_space = svc_write_space;
716
717 /* initialise setting must have enough space to
718 * receive and respond to one request.
719 * svc_udp_recvfrom will re-adjust if necessary
720 */
721 svc_sock_setbufsize(svsk->sk_sock,
722 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
723 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
724
725 /* data might have come in before data_ready set up */
726 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
727 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
728
729 /* make sure we get destination address info */
730 switch (svsk->sk_sk->sk_family) {
731 case AF_INET:
732 level = SOL_IP;
733 optname = IP_PKTINFO;
734 break;
735 case AF_INET6:
736 level = SOL_IPV6;
737 optname = IPV6_RECVPKTINFO;
738 break;
739 default:
740 BUG();
741 }
742 err = kernel_setsockopt(svsk->sk_sock, level, optname,
743 (char *)&one, sizeof(one));
744 dprintk("svc: kernel_setsockopt returned %d\n", err);
745 }
746
747 /*
748 * A data_ready event on a listening socket means there's a connection
749 * pending. Do not use state_change as a substitute for it.
750 */
751 static void svc_tcp_listen_data_ready(struct sock *sk)
752 {
753 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
754
755 dprintk("svc: socket %p TCP (listen) state change %d\n",
756 sk, sk->sk_state);
757
758 if (svsk) {
759 /* Refer to svc_setup_socket() for details. */
760 rmb();
761 svsk->sk_odata(sk);
762 }
763
764 /*
765 * This callback may called twice when a new connection
766 * is established as a child socket inherits everything
767 * from a parent LISTEN socket.
768 * 1) data_ready method of the parent socket will be called
769 * when one of child sockets become ESTABLISHED.
770 * 2) data_ready method of the child socket may be called
771 * when it receives data before the socket is accepted.
772 * In case of 2, we should ignore it silently.
773 */
774 if (sk->sk_state == TCP_LISTEN) {
775 if (svsk) {
776 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
777 svc_xprt_enqueue(&svsk->sk_xprt);
778 } else
779 printk("svc: socket %p: no user data\n", sk);
780 }
781 }
782
783 /*
784 * A state change on a connected socket means it's dying or dead.
785 */
786 static void svc_tcp_state_change(struct sock *sk)
787 {
788 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
789
790 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
791 sk, sk->sk_state, sk->sk_user_data);
792
793 if (!svsk)
794 printk("svc: socket %p: no user data\n", sk);
795 else {
796 /* Refer to svc_setup_socket() for details. */
797 rmb();
798 svsk->sk_ostate(sk);
799 if (sk->sk_state != TCP_ESTABLISHED) {
800 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
801 svc_xprt_enqueue(&svsk->sk_xprt);
802 }
803 }
804 }
805
806 /*
807 * Accept a TCP connection
808 */
809 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
810 {
811 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
812 struct sockaddr_storage addr;
813 struct sockaddr *sin = (struct sockaddr *) &addr;
814 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
815 struct socket *sock = svsk->sk_sock;
816 struct socket *newsock;
817 struct svc_sock *newsvsk;
818 int err, slen;
819 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
820
821 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
822 if (!sock)
823 return NULL;
824
825 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
826 err = kernel_accept(sock, &newsock, O_NONBLOCK);
827 if (err < 0) {
828 if (err == -ENOMEM)
829 printk(KERN_WARNING "%s: no more sockets!\n",
830 serv->sv_name);
831 else if (err != -EAGAIN)
832 net_warn_ratelimited("%s: accept failed (err %d)!\n",
833 serv->sv_name, -err);
834 return NULL;
835 }
836 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
837
838 err = kernel_getpeername(newsock, sin);
839 if (err < 0) {
840 net_warn_ratelimited("%s: peername failed (err %d)!\n",
841 serv->sv_name, -err);
842 goto failed; /* aborted connection or whatever */
843 }
844 slen = err;
845
846 /* Ideally, we would want to reject connections from unauthorized
847 * hosts here, but when we get encryption, the IP of the host won't
848 * tell us anything. For now just warn about unpriv connections.
849 */
850 if (!svc_port_is_privileged(sin)) {
851 dprintk("%s: connect from unprivileged port: %s\n",
852 serv->sv_name,
853 __svc_print_addr(sin, buf, sizeof(buf)));
854 }
855 dprintk("%s: connect from %s\n", serv->sv_name,
856 __svc_print_addr(sin, buf, sizeof(buf)));
857
858 /* Reset the inherited callbacks before calling svc_setup_socket */
859 newsock->sk->sk_state_change = svsk->sk_ostate;
860 newsock->sk->sk_data_ready = svsk->sk_odata;
861 newsock->sk->sk_write_space = svsk->sk_owspace;
862
863 /* make sure that a write doesn't block forever when
864 * low on memory
865 */
866 newsock->sk->sk_sndtimeo = HZ*30;
867
868 newsvsk = svc_setup_socket(serv, newsock,
869 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
870 if (IS_ERR(newsvsk))
871 goto failed;
872 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
873 err = kernel_getsockname(newsock, sin);
874 slen = err;
875 if (unlikely(err < 0)) {
876 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
877 slen = offsetof(struct sockaddr, sa_data);
878 }
879 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
880
881 if (sock_is_loopback(newsock->sk))
882 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
883 else
884 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
885 if (serv->sv_stats)
886 serv->sv_stats->nettcpconn++;
887
888 return &newsvsk->sk_xprt;
889
890 failed:
891 sock_release(newsock);
892 return NULL;
893 }
894
895 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
896 {
897 unsigned int i, len, npages;
898
899 if (svsk->sk_datalen == 0)
900 return 0;
901 len = svsk->sk_datalen;
902 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
903 for (i = 0; i < npages; i++) {
904 if (rqstp->rq_pages[i] != NULL)
905 put_page(rqstp->rq_pages[i]);
906 BUG_ON(svsk->sk_pages[i] == NULL);
907 rqstp->rq_pages[i] = svsk->sk_pages[i];
908 svsk->sk_pages[i] = NULL;
909 }
910 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
911 return len;
912 }
913
914 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
915 {
916 unsigned int i, len, npages;
917
918 if (svsk->sk_datalen == 0)
919 return;
920 len = svsk->sk_datalen;
921 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
922 for (i = 0; i < npages; i++) {
923 svsk->sk_pages[i] = rqstp->rq_pages[i];
924 rqstp->rq_pages[i] = NULL;
925 }
926 }
927
928 static void svc_tcp_clear_pages(struct svc_sock *svsk)
929 {
930 unsigned int i, len, npages;
931
932 if (svsk->sk_datalen == 0)
933 goto out;
934 len = svsk->sk_datalen;
935 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
936 for (i = 0; i < npages; i++) {
937 if (svsk->sk_pages[i] == NULL) {
938 WARN_ON_ONCE(1);
939 continue;
940 }
941 put_page(svsk->sk_pages[i]);
942 svsk->sk_pages[i] = NULL;
943 }
944 out:
945 svsk->sk_tcplen = 0;
946 svsk->sk_datalen = 0;
947 }
948
949 /*
950 * Receive fragment record header.
951 * If we haven't gotten the record length yet, get the next four bytes.
952 */
953 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
954 {
955 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
956 unsigned int want;
957 int len;
958
959 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
960 struct kvec iov;
961
962 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
963 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
964 iov.iov_len = want;
965 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
966 goto error;
967 svsk->sk_tcplen += len;
968
969 if (len < want) {
970 dprintk("svc: short recvfrom while reading record "
971 "length (%d of %d)\n", len, want);
972 return -EAGAIN;
973 }
974
975 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
976 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
977 serv->sv_max_mesg) {
978 net_notice_ratelimited("RPC: fragment too large: %d\n",
979 svc_sock_reclen(svsk));
980 goto err_delete;
981 }
982 }
983
984 return svc_sock_reclen(svsk);
985 error:
986 dprintk("RPC: TCP recv_record got %d\n", len);
987 return len;
988 err_delete:
989 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
990 return -EAGAIN;
991 }
992
993 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
994 {
995 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
996 struct rpc_rqst *req = NULL;
997 struct kvec *src, *dst;
998 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
999 __be32 xid;
1000 __be32 calldir;
1001
1002 xid = *p++;
1003 calldir = *p;
1004
1005 if (!bc_xprt)
1006 return -EAGAIN;
1007 spin_lock(&bc_xprt->queue_lock);
1008 req = xprt_lookup_rqst(bc_xprt, xid);
1009 if (!req)
1010 goto unlock_notfound;
1011
1012 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1013 /*
1014 * XXX!: cheating for now! Only copying HEAD.
1015 * But we know this is good enough for now (in fact, for any
1016 * callback reply in the forseeable future).
1017 */
1018 dst = &req->rq_private_buf.head[0];
1019 src = &rqstp->rq_arg.head[0];
1020 if (dst->iov_len < src->iov_len)
1021 goto unlock_eagain; /* whatever; just giving up. */
1022 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1023 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1024 rqstp->rq_arg.len = 0;
1025 spin_unlock(&bc_xprt->queue_lock);
1026 return 0;
1027 unlock_notfound:
1028 printk(KERN_NOTICE
1029 "%s: Got unrecognized reply: "
1030 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1031 __func__, ntohl(calldir),
1032 bc_xprt, ntohl(xid));
1033 unlock_eagain:
1034 spin_unlock(&bc_xprt->queue_lock);
1035 return -EAGAIN;
1036 }
1037
1038 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1039 {
1040 int i = 0;
1041 int t = 0;
1042
1043 while (t < len) {
1044 vec[i].iov_base = page_address(pages[i]);
1045 vec[i].iov_len = PAGE_SIZE;
1046 i++;
1047 t += PAGE_SIZE;
1048 }
1049 return i;
1050 }
1051
1052 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1053 {
1054 /* If we have more data, signal svc_xprt_enqueue() to try again */
1055 dprintk("svc: TCP %s record (%d bytes)\n",
1056 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1057 svc_sock_reclen(svsk));
1058 svsk->sk_tcplen = 0;
1059 svsk->sk_reclen = 0;
1060 }
1061
1062 /*
1063 * Receive data from a TCP socket.
1064 */
1065 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1066 {
1067 struct svc_sock *svsk =
1068 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1069 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1070 int len;
1071 struct kvec *vec;
1072 unsigned int want, base;
1073 __be32 *p;
1074 __be32 calldir;
1075 int pnum;
1076
1077 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1078 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1079 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1080 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1081
1082 len = svc_tcp_recv_record(svsk, rqstp);
1083 if (len < 0)
1084 goto error;
1085
1086 base = svc_tcp_restore_pages(svsk, rqstp);
1087 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1088
1089 vec = rqstp->rq_vec;
1090
1091 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1092 svsk->sk_datalen + want);
1093
1094 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1095 rqstp->rq_next_page = rqstp->rq_respages + 1;
1096
1097 /* Now receive data */
1098 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1099 if (len >= 0) {
1100 svsk->sk_tcplen += len;
1101 svsk->sk_datalen += len;
1102 }
1103 if (len != want || !svc_sock_final_rec(svsk)) {
1104 svc_tcp_save_pages(svsk, rqstp);
1105 if (len < 0 && len != -EAGAIN)
1106 goto err_delete;
1107 if (len == want)
1108 svc_tcp_fragment_received(svsk);
1109 else
1110 dprintk("svc: incomplete TCP record (%d of %d)\n",
1111 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1112 svc_sock_reclen(svsk));
1113 goto err_noclose;
1114 }
1115
1116 if (svsk->sk_datalen < 8) {
1117 svsk->sk_datalen = 0;
1118 goto err_delete; /* client is nuts. */
1119 }
1120
1121 rqstp->rq_arg.len = svsk->sk_datalen;
1122 rqstp->rq_arg.page_base = 0;
1123 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1124 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1125 rqstp->rq_arg.page_len = 0;
1126 } else
1127 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1128
1129 rqstp->rq_xprt_ctxt = NULL;
1130 rqstp->rq_prot = IPPROTO_TCP;
1131 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1132 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1133 else
1134 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1135
1136 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1137 calldir = p[1];
1138 if (calldir)
1139 len = receive_cb_reply(svsk, rqstp);
1140
1141 /* Reset TCP read info */
1142 svsk->sk_datalen = 0;
1143 svc_tcp_fragment_received(svsk);
1144
1145 if (len < 0)
1146 goto error;
1147
1148 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1149 if (serv->sv_stats)
1150 serv->sv_stats->nettcpcnt++;
1151
1152 return rqstp->rq_arg.len;
1153
1154 error:
1155 if (len != -EAGAIN)
1156 goto err_delete;
1157 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1158 return 0;
1159 err_delete:
1160 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1161 svsk->sk_xprt.xpt_server->sv_name, -len);
1162 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1163 err_noclose:
1164 return 0; /* record not complete */
1165 }
1166
1167 /*
1168 * Send out data on TCP socket.
1169 */
1170 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1171 {
1172 struct xdr_buf *xbufp = &rqstp->rq_res;
1173 int sent;
1174 __be32 reclen;
1175
1176 /* Set up the first element of the reply kvec.
1177 * Any other kvecs that may be in use have been taken
1178 * care of by the server implementation itself.
1179 */
1180 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1181 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1182
1183 sent = svc_sendto(rqstp, &rqstp->rq_res);
1184 if (sent != xbufp->len) {
1185 printk(KERN_NOTICE
1186 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1187 "- shutting down socket\n",
1188 rqstp->rq_xprt->xpt_server->sv_name,
1189 (sent<0)?"got error":"sent only",
1190 sent, xbufp->len);
1191 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1192 svc_xprt_enqueue(rqstp->rq_xprt);
1193 sent = -EAGAIN;
1194 }
1195 return sent;
1196 }
1197
1198 /*
1199 * Setup response header. TCP has a 4B record length field.
1200 */
1201 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1202 {
1203 struct kvec *resv = &rqstp->rq_res.head[0];
1204
1205 /* tcp needs a space for the record length... */
1206 svc_putnl(resv, 0);
1207 }
1208
1209 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1210 struct net *net,
1211 struct sockaddr *sa, int salen,
1212 int flags)
1213 {
1214 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1215 }
1216
1217 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1218 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1219 struct net *, struct sockaddr *,
1220 int, int);
1221 static void svc_bc_sock_free(struct svc_xprt *xprt);
1222
1223 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1224 struct net *net,
1225 struct sockaddr *sa, int salen,
1226 int flags)
1227 {
1228 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1229 }
1230
1231 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1232 {
1233 }
1234
1235 static const struct svc_xprt_ops svc_tcp_bc_ops = {
1236 .xpo_create = svc_bc_tcp_create,
1237 .xpo_detach = svc_bc_tcp_sock_detach,
1238 .xpo_free = svc_bc_sock_free,
1239 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1240 .xpo_secure_port = svc_sock_secure_port,
1241 };
1242
1243 static struct svc_xprt_class svc_tcp_bc_class = {
1244 .xcl_name = "tcp-bc",
1245 .xcl_owner = THIS_MODULE,
1246 .xcl_ops = &svc_tcp_bc_ops,
1247 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1248 };
1249
1250 static void svc_init_bc_xprt_sock(void)
1251 {
1252 svc_reg_xprt_class(&svc_tcp_bc_class);
1253 }
1254
1255 static void svc_cleanup_bc_xprt_sock(void)
1256 {
1257 svc_unreg_xprt_class(&svc_tcp_bc_class);
1258 }
1259 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1260 static void svc_init_bc_xprt_sock(void)
1261 {
1262 }
1263
1264 static void svc_cleanup_bc_xprt_sock(void)
1265 {
1266 }
1267 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1268
1269 static const struct svc_xprt_ops svc_tcp_ops = {
1270 .xpo_create = svc_tcp_create,
1271 .xpo_recvfrom = svc_tcp_recvfrom,
1272 .xpo_sendto = svc_tcp_sendto,
1273 .xpo_release_rqst = svc_release_skb,
1274 .xpo_detach = svc_tcp_sock_detach,
1275 .xpo_free = svc_sock_free,
1276 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1277 .xpo_has_wspace = svc_tcp_has_wspace,
1278 .xpo_accept = svc_tcp_accept,
1279 .xpo_secure_port = svc_sock_secure_port,
1280 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1281 };
1282
1283 static struct svc_xprt_class svc_tcp_class = {
1284 .xcl_name = "tcp",
1285 .xcl_owner = THIS_MODULE,
1286 .xcl_ops = &svc_tcp_ops,
1287 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1288 .xcl_ident = XPRT_TRANSPORT_TCP,
1289 };
1290
1291 void svc_init_xprt_sock(void)
1292 {
1293 svc_reg_xprt_class(&svc_tcp_class);
1294 svc_reg_xprt_class(&svc_udp_class);
1295 svc_init_bc_xprt_sock();
1296 }
1297
1298 void svc_cleanup_xprt_sock(void)
1299 {
1300 svc_unreg_xprt_class(&svc_tcp_class);
1301 svc_unreg_xprt_class(&svc_udp_class);
1302 svc_cleanup_bc_xprt_sock();
1303 }
1304
1305 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1306 {
1307 struct sock *sk = svsk->sk_sk;
1308
1309 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1310 &svsk->sk_xprt, serv);
1311 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1312 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1313 if (sk->sk_state == TCP_LISTEN) {
1314 dprintk("setting up TCP socket for listening\n");
1315 strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
1316 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1317 sk->sk_data_ready = svc_tcp_listen_data_ready;
1318 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1319 } else {
1320 dprintk("setting up TCP socket for reading\n");
1321 sk->sk_state_change = svc_tcp_state_change;
1322 sk->sk_data_ready = svc_data_ready;
1323 sk->sk_write_space = svc_write_space;
1324
1325 svsk->sk_reclen = 0;
1326 svsk->sk_tcplen = 0;
1327 svsk->sk_datalen = 0;
1328 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1329
1330 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1331
1332 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1333 switch (sk->sk_state) {
1334 case TCP_SYN_RECV:
1335 case TCP_ESTABLISHED:
1336 break;
1337 default:
1338 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1339 }
1340 }
1341 }
1342
1343 void svc_sock_update_bufs(struct svc_serv *serv)
1344 {
1345 /*
1346 * The number of server threads has changed. Update
1347 * rcvbuf and sndbuf accordingly on all sockets
1348 */
1349 struct svc_sock *svsk;
1350
1351 spin_lock_bh(&serv->sv_lock);
1352 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1353 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1354 spin_unlock_bh(&serv->sv_lock);
1355 }
1356 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1357
1358 /*
1359 * Initialize socket for RPC use and create svc_sock struct
1360 */
1361 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1362 struct socket *sock,
1363 int flags)
1364 {
1365 struct svc_sock *svsk;
1366 struct sock *inet;
1367 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1368 int err = 0;
1369
1370 dprintk("svc: svc_setup_socket %p\n", sock);
1371 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1372 if (!svsk)
1373 return ERR_PTR(-ENOMEM);
1374
1375 inet = sock->sk;
1376
1377 /* Register socket with portmapper */
1378 if (pmap_register)
1379 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1380 inet->sk_protocol,
1381 ntohs(inet_sk(inet)->inet_sport));
1382
1383 if (err < 0) {
1384 kfree(svsk);
1385 return ERR_PTR(err);
1386 }
1387
1388 svsk->sk_sock = sock;
1389 svsk->sk_sk = inet;
1390 svsk->sk_ostate = inet->sk_state_change;
1391 svsk->sk_odata = inet->sk_data_ready;
1392 svsk->sk_owspace = inet->sk_write_space;
1393 /*
1394 * This barrier is necessary in order to prevent race condition
1395 * with svc_data_ready(), svc_listen_data_ready() and others
1396 * when calling callbacks above.
1397 */
1398 wmb();
1399 inet->sk_user_data = svsk;
1400
1401 /* Initialize the socket */
1402 if (sock->type == SOCK_DGRAM)
1403 svc_udp_init(svsk, serv);
1404 else
1405 svc_tcp_init(svsk, serv);
1406
1407 dprintk("svc: svc_setup_socket created %p (inet %p), "
1408 "listen %d close %d\n",
1409 svsk, svsk->sk_sk,
1410 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1411 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1412
1413 return svsk;
1414 }
1415
1416 bool svc_alien_sock(struct net *net, int fd)
1417 {
1418 int err;
1419 struct socket *sock = sockfd_lookup(fd, &err);
1420 bool ret = false;
1421
1422 if (!sock)
1423 goto out;
1424 if (sock_net(sock->sk) != net)
1425 ret = true;
1426 sockfd_put(sock);
1427 out:
1428 return ret;
1429 }
1430 EXPORT_SYMBOL_GPL(svc_alien_sock);
1431
1432 /**
1433 * svc_addsock - add a listener socket to an RPC service
1434 * @serv: pointer to RPC service to which to add a new listener
1435 * @fd: file descriptor of the new listener
1436 * @name_return: pointer to buffer to fill in with name of listener
1437 * @len: size of the buffer
1438 *
1439 * Fills in socket name and returns positive length of name if successful.
1440 * Name is terminated with '\n'. On error, returns a negative errno
1441 * value.
1442 */
1443 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1444 const size_t len)
1445 {
1446 int err = 0;
1447 struct socket *so = sockfd_lookup(fd, &err);
1448 struct svc_sock *svsk = NULL;
1449 struct sockaddr_storage addr;
1450 struct sockaddr *sin = (struct sockaddr *)&addr;
1451 int salen;
1452
1453 if (!so)
1454 return err;
1455 err = -EAFNOSUPPORT;
1456 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1457 goto out;
1458 err = -EPROTONOSUPPORT;
1459 if (so->sk->sk_protocol != IPPROTO_TCP &&
1460 so->sk->sk_protocol != IPPROTO_UDP)
1461 goto out;
1462 err = -EISCONN;
1463 if (so->state > SS_UNCONNECTED)
1464 goto out;
1465 err = -ENOENT;
1466 if (!try_module_get(THIS_MODULE))
1467 goto out;
1468 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1469 if (IS_ERR(svsk)) {
1470 module_put(THIS_MODULE);
1471 err = PTR_ERR(svsk);
1472 goto out;
1473 }
1474 salen = kernel_getsockname(svsk->sk_sock, sin);
1475 if (salen >= 0)
1476 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1477 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1478 return svc_one_sock_name(svsk, name_return, len);
1479 out:
1480 sockfd_put(so);
1481 return err;
1482 }
1483 EXPORT_SYMBOL_GPL(svc_addsock);
1484
1485 /*
1486 * Create socket for RPC service.
1487 */
1488 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1489 int protocol,
1490 struct net *net,
1491 struct sockaddr *sin, int len,
1492 int flags)
1493 {
1494 struct svc_sock *svsk;
1495 struct socket *sock;
1496 int error;
1497 int type;
1498 struct sockaddr_storage addr;
1499 struct sockaddr *newsin = (struct sockaddr *)&addr;
1500 int newlen;
1501 int family;
1502 int val;
1503 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1504
1505 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1506 serv->sv_program->pg_name, protocol,
1507 __svc_print_addr(sin, buf, sizeof(buf)));
1508
1509 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1510 printk(KERN_WARNING "svc: only UDP and TCP "
1511 "sockets supported\n");
1512 return ERR_PTR(-EINVAL);
1513 }
1514
1515 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1516 switch (sin->sa_family) {
1517 case AF_INET6:
1518 family = PF_INET6;
1519 break;
1520 case AF_INET:
1521 family = PF_INET;
1522 break;
1523 default:
1524 return ERR_PTR(-EINVAL);
1525 }
1526
1527 error = __sock_create(net, family, type, protocol, &sock, 1);
1528 if (error < 0)
1529 return ERR_PTR(error);
1530
1531 svc_reclassify_socket(sock);
1532
1533 /*
1534 * If this is an PF_INET6 listener, we want to avoid
1535 * getting requests from IPv4 remotes. Those should
1536 * be shunted to a PF_INET listener via rpcbind.
1537 */
1538 val = 1;
1539 if (family == PF_INET6)
1540 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1541 (char *)&val, sizeof(val));
1542
1543 if (type == SOCK_STREAM)
1544 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1545 error = kernel_bind(sock, sin, len);
1546 if (error < 0)
1547 goto bummer;
1548
1549 error = kernel_getsockname(sock, newsin);
1550 if (error < 0)
1551 goto bummer;
1552 newlen = error;
1553
1554 if (protocol == IPPROTO_TCP) {
1555 if ((error = kernel_listen(sock, 64)) < 0)
1556 goto bummer;
1557 }
1558
1559 svsk = svc_setup_socket(serv, sock, flags);
1560 if (IS_ERR(svsk)) {
1561 error = PTR_ERR(svsk);
1562 goto bummer;
1563 }
1564 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1565 return (struct svc_xprt *)svsk;
1566 bummer:
1567 dprintk("svc: svc_create_socket error = %d\n", -error);
1568 sock_release(sock);
1569 return ERR_PTR(error);
1570 }
1571
1572 /*
1573 * Detach the svc_sock from the socket so that no
1574 * more callbacks occur.
1575 */
1576 static void svc_sock_detach(struct svc_xprt *xprt)
1577 {
1578 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1579 struct sock *sk = svsk->sk_sk;
1580
1581 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1582
1583 /* put back the old socket callbacks */
1584 lock_sock(sk);
1585 sk->sk_state_change = svsk->sk_ostate;
1586 sk->sk_data_ready = svsk->sk_odata;
1587 sk->sk_write_space = svsk->sk_owspace;
1588 sk->sk_user_data = NULL;
1589 release_sock(sk);
1590 }
1591
1592 /*
1593 * Disconnect the socket, and reset the callbacks
1594 */
1595 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1596 {
1597 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1598
1599 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1600
1601 svc_sock_detach(xprt);
1602
1603 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1604 svc_tcp_clear_pages(svsk);
1605 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1606 }
1607 }
1608
1609 /*
1610 * Free the svc_sock's socket resources and the svc_sock itself.
1611 */
1612 static void svc_sock_free(struct svc_xprt *xprt)
1613 {
1614 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1615 dprintk("svc: svc_sock_free(%p)\n", svsk);
1616
1617 if (svsk->sk_sock->file)
1618 sockfd_put(svsk->sk_sock);
1619 else
1620 sock_release(svsk->sk_sock);
1621 kfree(svsk);
1622 }
1623
1624 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1625 /*
1626 * Create a back channel svc_xprt which shares the fore channel socket.
1627 */
1628 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1629 int protocol,
1630 struct net *net,
1631 struct sockaddr *sin, int len,
1632 int flags)
1633 {
1634 struct svc_sock *svsk;
1635 struct svc_xprt *xprt;
1636
1637 if (protocol != IPPROTO_TCP) {
1638 printk(KERN_WARNING "svc: only TCP sockets"
1639 " supported on shared back channel\n");
1640 return ERR_PTR(-EINVAL);
1641 }
1642
1643 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1644 if (!svsk)
1645 return ERR_PTR(-ENOMEM);
1646
1647 xprt = &svsk->sk_xprt;
1648 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1649 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1650
1651 serv->sv_bc_xprt = xprt;
1652
1653 return xprt;
1654 }
1655
1656 /*
1657 * Free a back channel svc_sock.
1658 */
1659 static void svc_bc_sock_free(struct svc_xprt *xprt)
1660 {
1661 if (xprt)
1662 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1663 }
1664 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
Linux with added FPC-III support