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arm64/efi: Mark __efistub_stext_offset as an absolute symbol explicitly
[linux/fpc-iii.git] / net / sunrpc / svcsock.c
blob540fde2804d025009b46f8369eecbff9dbffeb13
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 #ifdef CONFIG_DEBUG_LOCK_ALLOC
74 static struct lock_class_key svc_key[2];
75 static struct lock_class_key svc_slock_key[2];
76
77 static void svc_reclassify_socket(struct socket *sock)
78 {
79 struct sock *sk = sock->sk;
80
81 if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
82 return;
83
84 switch (sk->sk_family) {
85 case AF_INET:
86 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
87 &svc_slock_key[0],
88 "sk_xprt.xpt_lock-AF_INET-NFSD",
89 &svc_key[0]);
90 break;
91
92 case AF_INET6:
93 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
94 &svc_slock_key[1],
95 "sk_xprt.xpt_lock-AF_INET6-NFSD",
96 &svc_key[1]);
97 break;
98
99 default:
100 BUG();
101 }
102 }
103 #else
104 static void svc_reclassify_socket(struct socket *sock)
105 {
106 }
107 #endif
108
109 /*
110 * Release an skbuff after use
111 */
112 static void svc_release_skb(struct svc_rqst *rqstp)
113 {
114 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
115
116 if (skb) {
117 struct svc_sock *svsk =
118 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
119 rqstp->rq_xprt_ctxt = NULL;
120
121 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
122 skb_free_datagram_locked(svsk->sk_sk, skb);
123 }
124 }
125
126 static void svc_release_udp_skb(struct svc_rqst *rqstp)
127 {
128 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
129
130 if (skb) {
131 rqstp->rq_xprt_ctxt = NULL;
132
133 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
134 consume_skb(skb);
135 }
136 }
137
138 union svc_pktinfo_u {
139 struct in_pktinfo pkti;
140 struct in6_pktinfo pkti6;
141 };
142 #define SVC_PKTINFO_SPACE \
143 CMSG_SPACE(sizeof(union svc_pktinfo_u))
144
145 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
146 {
147 struct svc_sock *svsk =
148 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
149 switch (svsk->sk_sk->sk_family) {
150 case AF_INET: {
151 struct in_pktinfo *pki = CMSG_DATA(cmh);
152
153 cmh->cmsg_level = SOL_IP;
154 cmh->cmsg_type = IP_PKTINFO;
155 pki->ipi_ifindex = 0;
156 pki->ipi_spec_dst.s_addr =
157 svc_daddr_in(rqstp)->sin_addr.s_addr;
158 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
159 }
160 break;
161
162 case AF_INET6: {
163 struct in6_pktinfo *pki = CMSG_DATA(cmh);
164 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
165
166 cmh->cmsg_level = SOL_IPV6;
167 cmh->cmsg_type = IPV6_PKTINFO;
168 pki->ipi6_ifindex = daddr->sin6_scope_id;
169 pki->ipi6_addr = daddr->sin6_addr;
170 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
171 }
172 break;
173 }
174 }
175
176 /*
177 * send routine intended to be shared by the fore- and back-channel
178 */
179 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
180 struct page *headpage, unsigned long headoffset,
181 struct page *tailpage, unsigned long tailoffset)
182 {
183 int result;
184 int size;
185 struct page **ppage = xdr->pages;
186 size_t base = xdr->page_base;
187 unsigned int pglen = xdr->page_len;
188 unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST;
189 int slen;
190 int len = 0;
191
192 slen = xdr->len;
193
194 /* send head */
195 if (slen == xdr->head[0].iov_len)
196 flags = 0;
197 len = kernel_sendpage(sock, headpage, headoffset,
198 xdr->head[0].iov_len, flags);
199 if (len != xdr->head[0].iov_len)
200 goto out;
201 slen -= xdr->head[0].iov_len;
202 if (slen == 0)
203 goto out;
204
205 /* send page data */
206 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
207 while (pglen > 0) {
208 if (slen == size)
209 flags = 0;
210 result = kernel_sendpage(sock, *ppage, base, size, flags);
211 if (result > 0)
212 len += result;
213 if (result != size)
214 goto out;
215 slen -= size;
216 pglen -= size;
217 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
218 base = 0;
219 ppage++;
220 }
221
222 /* send tail */
223 if (xdr->tail[0].iov_len) {
224 result = kernel_sendpage(sock, tailpage, tailoffset,
225 xdr->tail[0].iov_len, 0);
226 if (result > 0)
227 len += result;
228 }
229
230 out:
231 return len;
232 }
233
234
235 /*
236 * Generic sendto routine
237 */
238 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
239 {
240 struct svc_sock *svsk =
241 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
242 struct socket *sock = svsk->sk_sock;
243 union {
244 struct cmsghdr hdr;
245 long all[SVC_PKTINFO_SPACE / sizeof(long)];
246 } buffer;
247 struct cmsghdr *cmh = &buffer.hdr;
248 int len = 0;
249 unsigned long tailoff;
250 unsigned long headoff;
251 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
252
253 if (rqstp->rq_prot == IPPROTO_UDP) {
254 struct msghdr msg = {
255 .msg_name = &rqstp->rq_addr,
256 .msg_namelen = rqstp->rq_addrlen,
257 .msg_control = cmh,
258 .msg_controllen = sizeof(buffer),
259 .msg_flags = MSG_MORE,
260 };
261
262 svc_set_cmsg_data(rqstp, cmh);
263
264 if (sock_sendmsg(sock, &msg) < 0)
265 goto out;
266 }
267
268 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
269 headoff = 0;
270 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
271 rqstp->rq_respages[0], tailoff);
272
273 out:
274 dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n",
275 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
276 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
277
278 return len;
279 }
280
281 /*
282 * Report socket names for nfsdfs
283 */
284 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
285 {
286 const struct sock *sk = svsk->sk_sk;
287 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
288 "udp" : "tcp";
289 int len;
290
291 switch (sk->sk_family) {
292 case PF_INET:
293 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
294 proto_name,
295 &inet_sk(sk)->inet_rcv_saddr,
296 inet_sk(sk)->inet_num);
297 break;
298 #if IS_ENABLED(CONFIG_IPV6)
299 case PF_INET6:
300 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
301 proto_name,
302 &sk->sk_v6_rcv_saddr,
303 inet_sk(sk)->inet_num);
304 break;
305 #endif
306 default:
307 len = snprintf(buf, remaining, "*unknown-%d*\n",
308 sk->sk_family);
309 }
310
311 if (len >= remaining) {
312 *buf = '\0';
313 return -ENAMETOOLONG;
314 }
315 return len;
316 }
317
318 /*
319 * Generic recvfrom routine.
320 */
321 static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov,
322 unsigned int nr, size_t buflen, unsigned int base)
323 {
324 struct svc_sock *svsk =
325 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
326 struct msghdr msg = { NULL };
327 ssize_t len;
328
329 rqstp->rq_xprt_hlen = 0;
330
331 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
332 iov_iter_kvec(&msg.msg_iter, READ, iov, nr, buflen);
333 if (base != 0) {
334 iov_iter_advance(&msg.msg_iter, base);
335 buflen -= base;
336 }
337 len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
338 /* If we read a full record, then assume there may be more
339 * data to read (stream based sockets only!)
340 */
341 if (len == buflen)
342 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
343
344 dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n",
345 svsk, iov[0].iov_base, iov[0].iov_len, len);
346 return len;
347 }
348
349 /*
350 * Set socket snd and rcv buffer lengths
351 */
352 static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs)
353 {
354 unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg;
355 struct socket *sock = svsk->sk_sock;
356
357 nreqs = min(nreqs, INT_MAX / 2 / max_mesg);
358
359 lock_sock(sock->sk);
360 sock->sk->sk_sndbuf = nreqs * max_mesg * 2;
361 sock->sk->sk_rcvbuf = nreqs * max_mesg * 2;
362 sock->sk->sk_write_space(sock->sk);
363 release_sock(sock->sk);
364 }
365
366 static void svc_sock_secure_port(struct svc_rqst *rqstp)
367 {
368 if (svc_port_is_privileged(svc_addr(rqstp)))
369 set_bit(RQ_SECURE, &rqstp->rq_flags);
370 else
371 clear_bit(RQ_SECURE, &rqstp->rq_flags);
372 }
373
374 /*
375 * INET callback when data has been received on the socket.
376 */
377 static void svc_data_ready(struct sock *sk)
378 {
379 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
380
381 if (svsk) {
382 dprintk("svc: socket %p(inet %p), busy=%d\n",
383 svsk, sk,
384 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
385
386 /* Refer to svc_setup_socket() for details. */
387 rmb();
388 svsk->sk_odata(sk);
389 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
390 svc_xprt_enqueue(&svsk->sk_xprt);
391 }
392 }
393
394 /*
395 * INET callback when space is newly available on the socket.
396 */
397 static void svc_write_space(struct sock *sk)
398 {
399 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
400
401 if (svsk) {
402 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
403 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
404
405 /* Refer to svc_setup_socket() for details. */
406 rmb();
407 svsk->sk_owspace(sk);
408 svc_xprt_enqueue(&svsk->sk_xprt);
409 }
410 }
411
412 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
413 {
414 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
415
416 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
417 return 1;
418 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
419 }
420
421 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
422 {
423 struct svc_sock *svsk;
424 struct socket *sock;
425 struct linger no_linger = {
426 .l_onoff = 1,
427 .l_linger = 0,
428 };
429
430 svsk = container_of(xprt, struct svc_sock, sk_xprt);
431 sock = svsk->sk_sock;
432 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
433 (char *)&no_linger, sizeof(no_linger));
434 }
435
436 /*
437 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
438 */
439 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
440 struct cmsghdr *cmh)
441 {
442 struct in_pktinfo *pki = CMSG_DATA(cmh);
443 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
444
445 if (cmh->cmsg_type != IP_PKTINFO)
446 return 0;
447
448 daddr->sin_family = AF_INET;
449 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
450 return 1;
451 }
452
453 /*
454 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
455 */
456 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
457 struct cmsghdr *cmh)
458 {
459 struct in6_pktinfo *pki = CMSG_DATA(cmh);
460 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
461
462 if (cmh->cmsg_type != IPV6_PKTINFO)
463 return 0;
464
465 daddr->sin6_family = AF_INET6;
466 daddr->sin6_addr = pki->ipi6_addr;
467 daddr->sin6_scope_id = pki->ipi6_ifindex;
468 return 1;
469 }
470
471 /*
472 * Copy the UDP datagram's destination address to the rqstp structure.
473 * The 'destination' address in this case is the address to which the
474 * peer sent the datagram, i.e. our local address. For multihomed
475 * hosts, this can change from msg to msg. Note that only the IP
476 * address changes, the port number should remain the same.
477 */
478 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
479 struct cmsghdr *cmh)
480 {
481 switch (cmh->cmsg_level) {
482 case SOL_IP:
483 return svc_udp_get_dest_address4(rqstp, cmh);
484 case SOL_IPV6:
485 return svc_udp_get_dest_address6(rqstp, cmh);
486 }
487
488 return 0;
489 }
490
491 /*
492 * Receive a datagram from a UDP socket.
493 */
494 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
495 {
496 struct svc_sock *svsk =
497 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
498 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
499 struct sk_buff *skb;
500 union {
501 struct cmsghdr hdr;
502 long all[SVC_PKTINFO_SPACE / sizeof(long)];
503 } buffer;
504 struct cmsghdr *cmh = &buffer.hdr;
505 struct msghdr msg = {
506 .msg_name = svc_addr(rqstp),
507 .msg_control = cmh,
508 .msg_controllen = sizeof(buffer),
509 .msg_flags = MSG_DONTWAIT,
510 };
511 size_t len;
512 int err;
513
514 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
515 /* udp sockets need large rcvbuf as all pending
516 * requests are still in that buffer. sndbuf must
517 * also be large enough that there is enough space
518 * for one reply per thread. We count all threads
519 * rather than threads in a particular pool, which
520 * provides an upper bound on the number of threads
521 * which will access the socket.
522 */
523 svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3);
524
525 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
526 skb = NULL;
527 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
528 0, 0, MSG_PEEK | MSG_DONTWAIT);
529 if (err >= 0)
530 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
531
532 if (skb == NULL) {
533 if (err != -EAGAIN) {
534 /* possibly an icmp error */
535 dprintk("svc: recvfrom returned error %d\n", -err);
536 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
537 }
538 return 0;
539 }
540 len = svc_addr_len(svc_addr(rqstp));
541 rqstp->rq_addrlen = len;
542 if (skb->tstamp == 0) {
543 skb->tstamp = ktime_get_real();
544 /* Don't enable netstamp, sunrpc doesn't
545 need that much accuracy */
546 }
547 sock_write_timestamp(svsk->sk_sk, skb->tstamp);
548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
549
550 len = skb->len;
551 rqstp->rq_arg.len = len;
552
553 rqstp->rq_prot = IPPROTO_UDP;
554
555 if (!svc_udp_get_dest_address(rqstp, cmh)) {
556 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
557 cmh->cmsg_level, cmh->cmsg_type);
558 goto out_free;
559 }
560 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
561
562 if (skb_is_nonlinear(skb)) {
563 /* we have to copy */
564 local_bh_disable();
565 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
566 local_bh_enable();
567 /* checksum error */
568 goto out_free;
569 }
570 local_bh_enable();
571 consume_skb(skb);
572 } else {
573 /* we can use it in-place */
574 rqstp->rq_arg.head[0].iov_base = skb->data;
575 rqstp->rq_arg.head[0].iov_len = len;
576 if (skb_checksum_complete(skb))
577 goto out_free;
578 rqstp->rq_xprt_ctxt = skb;
579 }
580
581 rqstp->rq_arg.page_base = 0;
582 if (len <= rqstp->rq_arg.head[0].iov_len) {
583 rqstp->rq_arg.head[0].iov_len = len;
584 rqstp->rq_arg.page_len = 0;
585 rqstp->rq_respages = rqstp->rq_pages+1;
586 } else {
587 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
588 rqstp->rq_respages = rqstp->rq_pages + 1 +
589 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
590 }
591 rqstp->rq_next_page = rqstp->rq_respages+1;
592
593 if (serv->sv_stats)
594 serv->sv_stats->netudpcnt++;
595
596 return len;
597 out_free:
598 kfree_skb(skb);
599 return 0;
600 }
601
602 static int
603 svc_udp_sendto(struct svc_rqst *rqstp)
604 {
605 int error;
606
607 error = svc_sendto(rqstp, &rqstp->rq_res);
608 if (error == -ECONNREFUSED)
609 /* ICMP error on earlier request. */
610 error = svc_sendto(rqstp, &rqstp->rq_res);
611
612 return error;
613 }
614
615 static int svc_udp_has_wspace(struct svc_xprt *xprt)
616 {
617 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
618 struct svc_serv *serv = xprt->xpt_server;
619 unsigned long required;
620
621 /*
622 * Set the SOCK_NOSPACE flag before checking the available
623 * sock space.
624 */
625 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
626 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
627 if (required*2 > sock_wspace(svsk->sk_sk))
628 return 0;
629 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
630 return 1;
631 }
632
633 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
634 {
635 BUG();
636 return NULL;
637 }
638
639 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
640 {
641 }
642
643 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
644 struct net *net,
645 struct sockaddr *sa, int salen,
646 int flags)
647 {
648 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
649 }
650
651 static const struct svc_xprt_ops svc_udp_ops = {
652 .xpo_create = svc_udp_create,
653 .xpo_recvfrom = svc_udp_recvfrom,
654 .xpo_sendto = svc_udp_sendto,
655 .xpo_release_rqst = svc_release_udp_skb,
656 .xpo_detach = svc_sock_detach,
657 .xpo_free = svc_sock_free,
658 .xpo_has_wspace = svc_udp_has_wspace,
659 .xpo_accept = svc_udp_accept,
660 .xpo_secure_port = svc_sock_secure_port,
661 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
662 };
663
664 static struct svc_xprt_class svc_udp_class = {
665 .xcl_name = "udp",
666 .xcl_owner = THIS_MODULE,
667 .xcl_ops = &svc_udp_ops,
668 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
669 .xcl_ident = XPRT_TRANSPORT_UDP,
670 };
671
672 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
673 {
674 int err, level, optname, one = 1;
675
676 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
677 &svsk->sk_xprt, serv);
678 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
679 svsk->sk_sk->sk_data_ready = svc_data_ready;
680 svsk->sk_sk->sk_write_space = svc_write_space;
681
682 /* initialise setting must have enough space to
683 * receive and respond to one request.
684 * svc_udp_recvfrom will re-adjust if necessary
685 */
686 svc_sock_setbufsize(svsk, 3);
687
688 /* data might have come in before data_ready set up */
689 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
690 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
691
692 /* make sure we get destination address info */
693 switch (svsk->sk_sk->sk_family) {
694 case AF_INET:
695 level = SOL_IP;
696 optname = IP_PKTINFO;
697 break;
698 case AF_INET6:
699 level = SOL_IPV6;
700 optname = IPV6_RECVPKTINFO;
701 break;
702 default:
703 BUG();
704 }
705 err = kernel_setsockopt(svsk->sk_sock, level, optname,
706 (char *)&one, sizeof(one));
707 dprintk("svc: kernel_setsockopt returned %d\n", err);
708 }
709
710 /*
711 * A data_ready event on a listening socket means there's a connection
712 * pending. Do not use state_change as a substitute for it.
713 */
714 static void svc_tcp_listen_data_ready(struct sock *sk)
715 {
716 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
717
718 dprintk("svc: socket %p TCP (listen) state change %d\n",
719 sk, sk->sk_state);
720
721 if (svsk) {
722 /* Refer to svc_setup_socket() for details. */
723 rmb();
724 svsk->sk_odata(sk);
725 }
726
727 /*
728 * This callback may called twice when a new connection
729 * is established as a child socket inherits everything
730 * from a parent LISTEN socket.
731 * 1) data_ready method of the parent socket will be called
732 * when one of child sockets become ESTABLISHED.
733 * 2) data_ready method of the child socket may be called
734 * when it receives data before the socket is accepted.
735 * In case of 2, we should ignore it silently.
736 */
737 if (sk->sk_state == TCP_LISTEN) {
738 if (svsk) {
739 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
740 svc_xprt_enqueue(&svsk->sk_xprt);
741 } else
742 printk("svc: socket %p: no user data\n", sk);
743 }
744 }
745
746 /*
747 * A state change on a connected socket means it's dying or dead.
748 */
749 static void svc_tcp_state_change(struct sock *sk)
750 {
751 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
752
753 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
754 sk, sk->sk_state, sk->sk_user_data);
755
756 if (!svsk)
757 printk("svc: socket %p: no user data\n", sk);
758 else {
759 /* Refer to svc_setup_socket() for details. */
760 rmb();
761 svsk->sk_ostate(sk);
762 if (sk->sk_state != TCP_ESTABLISHED) {
763 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
764 svc_xprt_enqueue(&svsk->sk_xprt);
765 }
766 }
767 }
768
769 /*
770 * Accept a TCP connection
771 */
772 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
773 {
774 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
775 struct sockaddr_storage addr;
776 struct sockaddr *sin = (struct sockaddr *) &addr;
777 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
778 struct socket *sock = svsk->sk_sock;
779 struct socket *newsock;
780 struct svc_sock *newsvsk;
781 int err, slen;
782 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
783
784 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
785 if (!sock)
786 return NULL;
787
788 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
789 err = kernel_accept(sock, &newsock, O_NONBLOCK);
790 if (err < 0) {
791 if (err == -ENOMEM)
792 printk(KERN_WARNING "%s: no more sockets!\n",
793 serv->sv_name);
794 else if (err != -EAGAIN)
795 net_warn_ratelimited("%s: accept failed (err %d)!\n",
796 serv->sv_name, -err);
797 return NULL;
798 }
799 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
800
801 err = kernel_getpeername(newsock, sin);
802 if (err < 0) {
803 net_warn_ratelimited("%s: peername failed (err %d)!\n",
804 serv->sv_name, -err);
805 goto failed; /* aborted connection or whatever */
806 }
807 slen = err;
808
809 /* Ideally, we would want to reject connections from unauthorized
810 * hosts here, but when we get encryption, the IP of the host won't
811 * tell us anything. For now just warn about unpriv connections.
812 */
813 if (!svc_port_is_privileged(sin)) {
814 dprintk("%s: connect from unprivileged port: %s\n",
815 serv->sv_name,
816 __svc_print_addr(sin, buf, sizeof(buf)));
817 }
818 dprintk("%s: connect from %s\n", serv->sv_name,
819 __svc_print_addr(sin, buf, sizeof(buf)));
820
821 /* Reset the inherited callbacks before calling svc_setup_socket */
822 newsock->sk->sk_state_change = svsk->sk_ostate;
823 newsock->sk->sk_data_ready = svsk->sk_odata;
824 newsock->sk->sk_write_space = svsk->sk_owspace;
825
826 /* make sure that a write doesn't block forever when
827 * low on memory
828 */
829 newsock->sk->sk_sndtimeo = HZ*30;
830
831 newsvsk = svc_setup_socket(serv, newsock,
832 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
833 if (IS_ERR(newsvsk))
834 goto failed;
835 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
836 err = kernel_getsockname(newsock, sin);
837 slen = err;
838 if (unlikely(err < 0)) {
839 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
840 slen = offsetof(struct sockaddr, sa_data);
841 }
842 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
843
844 if (sock_is_loopback(newsock->sk))
845 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
846 else
847 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
848 if (serv->sv_stats)
849 serv->sv_stats->nettcpconn++;
850
851 return &newsvsk->sk_xprt;
852
853 failed:
854 sock_release(newsock);
855 return NULL;
856 }
857
858 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
859 {
860 unsigned int i, len, npages;
861
862 if (svsk->sk_datalen == 0)
863 return 0;
864 len = svsk->sk_datalen;
865 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
866 for (i = 0; i < npages; i++) {
867 if (rqstp->rq_pages[i] != NULL)
868 put_page(rqstp->rq_pages[i]);
869 BUG_ON(svsk->sk_pages[i] == NULL);
870 rqstp->rq_pages[i] = svsk->sk_pages[i];
871 svsk->sk_pages[i] = NULL;
872 }
873 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
874 return len;
875 }
876
877 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
878 {
879 unsigned int i, len, npages;
880
881 if (svsk->sk_datalen == 0)
882 return;
883 len = svsk->sk_datalen;
884 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
885 for (i = 0; i < npages; i++) {
886 svsk->sk_pages[i] = rqstp->rq_pages[i];
887 rqstp->rq_pages[i] = NULL;
888 }
889 }
890
891 static void svc_tcp_clear_pages(struct svc_sock *svsk)
892 {
893 unsigned int i, len, npages;
894
895 if (svsk->sk_datalen == 0)
896 goto out;
897 len = svsk->sk_datalen;
898 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
899 for (i = 0; i < npages; i++) {
900 if (svsk->sk_pages[i] == NULL) {
901 WARN_ON_ONCE(1);
902 continue;
903 }
904 put_page(svsk->sk_pages[i]);
905 svsk->sk_pages[i] = NULL;
906 }
907 out:
908 svsk->sk_tcplen = 0;
909 svsk->sk_datalen = 0;
910 }
911
912 /*
913 * Receive fragment record header.
914 * If we haven't gotten the record length yet, get the next four bytes.
915 */
916 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
917 {
918 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
919 unsigned int want;
920 int len;
921
922 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
923 struct kvec iov;
924
925 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
926 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
927 iov.iov_len = want;
928 len = svc_recvfrom(rqstp, &iov, 1, want, 0);
929 if (len < 0)
930 goto error;
931 svsk->sk_tcplen += len;
932
933 if (len < want) {
934 dprintk("svc: short recvfrom while reading record "
935 "length (%d of %d)\n", len, want);
936 return -EAGAIN;
937 }
938
939 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
940 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
941 serv->sv_max_mesg) {
942 net_notice_ratelimited("RPC: fragment too large: %d\n",
943 svc_sock_reclen(svsk));
944 goto err_delete;
945 }
946 }
947
948 return svc_sock_reclen(svsk);
949 error:
950 dprintk("RPC: TCP recv_record got %d\n", len);
951 return len;
952 err_delete:
953 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
954 return -EAGAIN;
955 }
956
957 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
958 {
959 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
960 struct rpc_rqst *req = NULL;
961 struct kvec *src, *dst;
962 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
963 __be32 xid;
964 __be32 calldir;
965
966 xid = *p++;
967 calldir = *p;
968
969 if (!bc_xprt)
970 return -EAGAIN;
971 spin_lock(&bc_xprt->queue_lock);
972 req = xprt_lookup_rqst(bc_xprt, xid);
973 if (!req)
974 goto unlock_notfound;
975
976 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
977 /*
978 * XXX!: cheating for now! Only copying HEAD.
979 * But we know this is good enough for now (in fact, for any
980 * callback reply in the forseeable future).
981 */
982 dst = &req->rq_private_buf.head[0];
983 src = &rqstp->rq_arg.head[0];
984 if (dst->iov_len < src->iov_len)
985 goto unlock_eagain; /* whatever; just giving up. */
986 memcpy(dst->iov_base, src->iov_base, src->iov_len);
987 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
988 rqstp->rq_arg.len = 0;
989 spin_unlock(&bc_xprt->queue_lock);
990 return 0;
991 unlock_notfound:
992 printk(KERN_NOTICE
993 "%s: Got unrecognized reply: "
994 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
995 __func__, ntohl(calldir),
996 bc_xprt, ntohl(xid));
997 unlock_eagain:
998 spin_unlock(&bc_xprt->queue_lock);
999 return -EAGAIN;
1000 }
1001
1002 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1003 {
1004 int i = 0;
1005 int t = 0;
1006
1007 while (t < len) {
1008 vec[i].iov_base = page_address(pages[i]);
1009 vec[i].iov_len = PAGE_SIZE;
1010 i++;
1011 t += PAGE_SIZE;
1012 }
1013 return i;
1014 }
1015
1016 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1017 {
1018 /* If we have more data, signal svc_xprt_enqueue() to try again */
1019 dprintk("svc: TCP %s record (%d bytes)\n",
1020 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1021 svc_sock_reclen(svsk));
1022 svsk->sk_tcplen = 0;
1023 svsk->sk_reclen = 0;
1024 }
1025
1026 /*
1027 * Receive data from a TCP socket.
1028 */
1029 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1030 {
1031 struct svc_sock *svsk =
1032 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1033 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1034 int len;
1035 struct kvec *vec;
1036 unsigned int want, base;
1037 __be32 *p;
1038 __be32 calldir;
1039 int pnum;
1040
1041 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1042 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1043 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1044 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1045
1046 len = svc_tcp_recv_record(svsk, rqstp);
1047 if (len < 0)
1048 goto error;
1049
1050 base = svc_tcp_restore_pages(svsk, rqstp);
1051 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1052
1053 vec = rqstp->rq_vec;
1054
1055 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want);
1056
1057 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1058 rqstp->rq_next_page = rqstp->rq_respages + 1;
1059
1060 /* Now receive data */
1061 len = svc_recvfrom(rqstp, vec, pnum, base + want, base);
1062 if (len >= 0) {
1063 svsk->sk_tcplen += len;
1064 svsk->sk_datalen += len;
1065 }
1066 if (len != want || !svc_sock_final_rec(svsk)) {
1067 svc_tcp_save_pages(svsk, rqstp);
1068 if (len < 0 && len != -EAGAIN)
1069 goto err_delete;
1070 if (len == want)
1071 svc_tcp_fragment_received(svsk);
1072 else
1073 dprintk("svc: incomplete TCP record (%d of %d)\n",
1074 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1075 svc_sock_reclen(svsk));
1076 goto err_noclose;
1077 }
1078
1079 if (svsk->sk_datalen < 8) {
1080 svsk->sk_datalen = 0;
1081 goto err_delete; /* client is nuts. */
1082 }
1083
1084 rqstp->rq_arg.len = svsk->sk_datalen;
1085 rqstp->rq_arg.page_base = 0;
1086 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1087 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1088 rqstp->rq_arg.page_len = 0;
1089 } else
1090 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1091
1092 rqstp->rq_xprt_ctxt = NULL;
1093 rqstp->rq_prot = IPPROTO_TCP;
1094 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1095 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1096 else
1097 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1098
1099 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1100 calldir = p[1];
1101 if (calldir)
1102 len = receive_cb_reply(svsk, rqstp);
1103
1104 /* Reset TCP read info */
1105 svsk->sk_datalen = 0;
1106 svc_tcp_fragment_received(svsk);
1107
1108 if (len < 0)
1109 goto error;
1110
1111 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1112 if (serv->sv_stats)
1113 serv->sv_stats->nettcpcnt++;
1114
1115 return rqstp->rq_arg.len;
1116
1117 error:
1118 if (len != -EAGAIN)
1119 goto err_delete;
1120 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1121 return 0;
1122 err_delete:
1123 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1124 svsk->sk_xprt.xpt_server->sv_name, -len);
1125 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1126 err_noclose:
1127 return 0; /* record not complete */
1128 }
1129
1130 /*
1131 * Send out data on TCP socket.
1132 */
1133 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1134 {
1135 struct xdr_buf *xbufp = &rqstp->rq_res;
1136 int sent;
1137 __be32 reclen;
1138
1139 /* Set up the first element of the reply kvec.
1140 * Any other kvecs that may be in use have been taken
1141 * care of by the server implementation itself.
1142 */
1143 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1144 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1145
1146 sent = svc_sendto(rqstp, &rqstp->rq_res);
1147 if (sent != xbufp->len) {
1148 printk(KERN_NOTICE
1149 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1150 "- shutting down socket\n",
1151 rqstp->rq_xprt->xpt_server->sv_name,
1152 (sent<0)?"got error":"sent only",
1153 sent, xbufp->len);
1154 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1155 svc_xprt_enqueue(rqstp->rq_xprt);
1156 sent = -EAGAIN;
1157 }
1158 return sent;
1159 }
1160
1161 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1162 struct net *net,
1163 struct sockaddr *sa, int salen,
1164 int flags)
1165 {
1166 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1167 }
1168
1169 static const struct svc_xprt_ops svc_tcp_ops = {
1170 .xpo_create = svc_tcp_create,
1171 .xpo_recvfrom = svc_tcp_recvfrom,
1172 .xpo_sendto = svc_tcp_sendto,
1173 .xpo_release_rqst = svc_release_skb,
1174 .xpo_detach = svc_tcp_sock_detach,
1175 .xpo_free = svc_sock_free,
1176 .xpo_has_wspace = svc_tcp_has_wspace,
1177 .xpo_accept = svc_tcp_accept,
1178 .xpo_secure_port = svc_sock_secure_port,
1179 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1180 };
1181
1182 static struct svc_xprt_class svc_tcp_class = {
1183 .xcl_name = "tcp",
1184 .xcl_owner = THIS_MODULE,
1185 .xcl_ops = &svc_tcp_ops,
1186 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1187 .xcl_ident = XPRT_TRANSPORT_TCP,
1188 };
1189
1190 void svc_init_xprt_sock(void)
1191 {
1192 svc_reg_xprt_class(&svc_tcp_class);
1193 svc_reg_xprt_class(&svc_udp_class);
1194 }
1195
1196 void svc_cleanup_xprt_sock(void)
1197 {
1198 svc_unreg_xprt_class(&svc_tcp_class);
1199 svc_unreg_xprt_class(&svc_udp_class);
1200 }
1201
1202 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1203 {
1204 struct sock *sk = svsk->sk_sk;
1205
1206 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1207 &svsk->sk_xprt, serv);
1208 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1209 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1210 if (sk->sk_state == TCP_LISTEN) {
1211 dprintk("setting up TCP socket for listening\n");
1212 strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
1213 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1214 sk->sk_data_ready = svc_tcp_listen_data_ready;
1215 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1216 } else {
1217 dprintk("setting up TCP socket for reading\n");
1218 sk->sk_state_change = svc_tcp_state_change;
1219 sk->sk_data_ready = svc_data_ready;
1220 sk->sk_write_space = svc_write_space;
1221
1222 svsk->sk_reclen = 0;
1223 svsk->sk_tcplen = 0;
1224 svsk->sk_datalen = 0;
1225 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1226
1227 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1228
1229 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1230 switch (sk->sk_state) {
1231 case TCP_SYN_RECV:
1232 case TCP_ESTABLISHED:
1233 break;
1234 default:
1235 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1236 }
1237 }
1238 }
1239
1240 void svc_sock_update_bufs(struct svc_serv *serv)
1241 {
1242 /*
1243 * The number of server threads has changed. Update
1244 * rcvbuf and sndbuf accordingly on all sockets
1245 */
1246 struct svc_sock *svsk;
1247
1248 spin_lock_bh(&serv->sv_lock);
1249 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1250 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1251 spin_unlock_bh(&serv->sv_lock);
1252 }
1253 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1254
1255 /*
1256 * Initialize socket for RPC use and create svc_sock struct
1257 */
1258 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1259 struct socket *sock,
1260 int flags)
1261 {
1262 struct svc_sock *svsk;
1263 struct sock *inet;
1264 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1265 int err = 0;
1266
1267 dprintk("svc: svc_setup_socket %p\n", sock);
1268 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1269 if (!svsk)
1270 return ERR_PTR(-ENOMEM);
1271
1272 inet = sock->sk;
1273
1274 /* Register socket with portmapper */
1275 if (pmap_register)
1276 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1277 inet->sk_protocol,
1278 ntohs(inet_sk(inet)->inet_sport));
1279
1280 if (err < 0) {
1281 kfree(svsk);
1282 return ERR_PTR(err);
1283 }
1284
1285 svsk->sk_sock = sock;
1286 svsk->sk_sk = inet;
1287 svsk->sk_ostate = inet->sk_state_change;
1288 svsk->sk_odata = inet->sk_data_ready;
1289 svsk->sk_owspace = inet->sk_write_space;
1290 /*
1291 * This barrier is necessary in order to prevent race condition
1292 * with svc_data_ready(), svc_listen_data_ready() and others
1293 * when calling callbacks above.
1294 */
1295 wmb();
1296 inet->sk_user_data = svsk;
1297
1298 /* Initialize the socket */
1299 if (sock->type == SOCK_DGRAM)
1300 svc_udp_init(svsk, serv);
1301 else
1302 svc_tcp_init(svsk, serv);
1303
1304 dprintk("svc: svc_setup_socket created %p (inet %p), "
1305 "listen %d close %d\n",
1306 svsk, svsk->sk_sk,
1307 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags),
1308 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1309
1310 return svsk;
1311 }
1312
1313 bool svc_alien_sock(struct net *net, int fd)
1314 {
1315 int err;
1316 struct socket *sock = sockfd_lookup(fd, &err);
1317 bool ret = false;
1318
1319 if (!sock)
1320 goto out;
1321 if (sock_net(sock->sk) != net)
1322 ret = true;
1323 sockfd_put(sock);
1324 out:
1325 return ret;
1326 }
1327 EXPORT_SYMBOL_GPL(svc_alien_sock);
1328
1329 /**
1330 * svc_addsock - add a listener socket to an RPC service
1331 * @serv: pointer to RPC service to which to add a new listener
1332 * @fd: file descriptor of the new listener
1333 * @name_return: pointer to buffer to fill in with name of listener
1334 * @len: size of the buffer
1335 * @cred: credential
1336 *
1337 * Fills in socket name and returns positive length of name if successful.
1338 * Name is terminated with '\n'. On error, returns a negative errno
1339 * value.
1340 */
1341 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1342 const size_t len, const struct cred *cred)
1343 {
1344 int err = 0;
1345 struct socket *so = sockfd_lookup(fd, &err);
1346 struct svc_sock *svsk = NULL;
1347 struct sockaddr_storage addr;
1348 struct sockaddr *sin = (struct sockaddr *)&addr;
1349 int salen;
1350
1351 if (!so)
1352 return err;
1353 err = -EAFNOSUPPORT;
1354 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1355 goto out;
1356 err = -EPROTONOSUPPORT;
1357 if (so->sk->sk_protocol != IPPROTO_TCP &&
1358 so->sk->sk_protocol != IPPROTO_UDP)
1359 goto out;
1360 err = -EISCONN;
1361 if (so->state > SS_UNCONNECTED)
1362 goto out;
1363 err = -ENOENT;
1364 if (!try_module_get(THIS_MODULE))
1365 goto out;
1366 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1367 if (IS_ERR(svsk)) {
1368 module_put(THIS_MODULE);
1369 err = PTR_ERR(svsk);
1370 goto out;
1371 }
1372 salen = kernel_getsockname(svsk->sk_sock, sin);
1373 if (salen >= 0)
1374 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1375 svsk->sk_xprt.xpt_cred = get_cred(cred);
1376 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1377 return svc_one_sock_name(svsk, name_return, len);
1378 out:
1379 sockfd_put(so);
1380 return err;
1381 }
1382 EXPORT_SYMBOL_GPL(svc_addsock);
1383
1384 /*
1385 * Create socket for RPC service.
1386 */
1387 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1388 int protocol,
1389 struct net *net,
1390 struct sockaddr *sin, int len,
1391 int flags)
1392 {
1393 struct svc_sock *svsk;
1394 struct socket *sock;
1395 int error;
1396 int type;
1397 struct sockaddr_storage addr;
1398 struct sockaddr *newsin = (struct sockaddr *)&addr;
1399 int newlen;
1400 int family;
1401 int val;
1402 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1403
1404 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1405 serv->sv_program->pg_name, protocol,
1406 __svc_print_addr(sin, buf, sizeof(buf)));
1407
1408 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1409 printk(KERN_WARNING "svc: only UDP and TCP "
1410 "sockets supported\n");
1411 return ERR_PTR(-EINVAL);
1412 }
1413
1414 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1415 switch (sin->sa_family) {
1416 case AF_INET6:
1417 family = PF_INET6;
1418 break;
1419 case AF_INET:
1420 family = PF_INET;
1421 break;
1422 default:
1423 return ERR_PTR(-EINVAL);
1424 }
1425
1426 error = __sock_create(net, family, type, protocol, &sock, 1);
1427 if (error < 0)
1428 return ERR_PTR(error);
1429
1430 svc_reclassify_socket(sock);
1431
1432 /*
1433 * If this is an PF_INET6 listener, we want to avoid
1434 * getting requests from IPv4 remotes. Those should
1435 * be shunted to a PF_INET listener via rpcbind.
1436 */
1437 val = 1;
1438 if (family == PF_INET6)
1439 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1440 (char *)&val, sizeof(val));
1441
1442 if (type == SOCK_STREAM)
1443 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1444 error = kernel_bind(sock, sin, len);
1445 if (error < 0)
1446 goto bummer;
1447
1448 error = kernel_getsockname(sock, newsin);
1449 if (error < 0)
1450 goto bummer;
1451 newlen = error;
1452
1453 if (protocol == IPPROTO_TCP) {
1454 if ((error = kernel_listen(sock, 64)) < 0)
1455 goto bummer;
1456 }
1457
1458 svsk = svc_setup_socket(serv, sock, flags);
1459 if (IS_ERR(svsk)) {
1460 error = PTR_ERR(svsk);
1461 goto bummer;
1462 }
1463 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1464 return (struct svc_xprt *)svsk;
1465 bummer:
1466 dprintk("svc: svc_create_socket error = %d\n", -error);
1467 sock_release(sock);
1468 return ERR_PTR(error);
1469 }
1470
1471 /*
1472 * Detach the svc_sock from the socket so that no
1473 * more callbacks occur.
1474 */
1475 static void svc_sock_detach(struct svc_xprt *xprt)
1476 {
1477 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1478 struct sock *sk = svsk->sk_sk;
1479
1480 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1481
1482 /* put back the old socket callbacks */
1483 lock_sock(sk);
1484 sk->sk_state_change = svsk->sk_ostate;
1485 sk->sk_data_ready = svsk->sk_odata;
1486 sk->sk_write_space = svsk->sk_owspace;
1487 sk->sk_user_data = NULL;
1488 release_sock(sk);
1489 }
1490
1491 /*
1492 * Disconnect the socket, and reset the callbacks
1493 */
1494 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1495 {
1496 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1497
1498 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1499
1500 svc_sock_detach(xprt);
1501
1502 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1503 svc_tcp_clear_pages(svsk);
1504 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1505 }
1506 }
1507
1508 /*
1509 * Free the svc_sock's socket resources and the svc_sock itself.
1510 */
1511 static void svc_sock_free(struct svc_xprt *xprt)
1512 {
1513 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1514 dprintk("svc: svc_sock_free(%p)\n", svsk);
1515
1516 if (svsk->sk_sock->file)
1517 sockfd_put(svsk->sk_sock);
1518 else
1519 sock_release(svsk->sk_sock);
1520 kfree(svsk);
1521 }
Linux with added FPC-III support