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amd-xgbe: Properly handle feature changes via ethtool
[linux-2.6/btrfs-unstable.git] / net / sunrpc / svcsock.c
blob3f959c681885ba41ccdf6300bb27a35745ec11be
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/tcp.h>
43 #include <net/tcp_states.h>
44 #include <asm/uaccess.h>
45 #include <asm/ioctls.h>
46 #include <trace/events/skb.h>
47
48 #include <linux/sunrpc/types.h>
49 #include <linux/sunrpc/clnt.h>
50 #include <linux/sunrpc/xdr.h>
51 #include <linux/sunrpc/msg_prot.h>
52 #include <linux/sunrpc/svcsock.h>
53 #include <linux/sunrpc/stats.h>
54 #include <linux/sunrpc/xprt.h>
55
56 #include "sunrpc.h"
57
58 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
59
60
61 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
62 int flags);
63 static void svc_udp_data_ready(struct sock *);
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 WARN_ON_ONCE(sock_owned_by_user(sk));
89 if (sock_owned_by_user(sk))
90 return;
91
92 switch (sk->sk_family) {
93 case AF_INET:
94 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
95 &svc_slock_key[0],
96 "sk_xprt.xpt_lock-AF_INET-NFSD",
97 &svc_key[0]);
98 break;
99
100 case AF_INET6:
101 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
102 &svc_slock_key[1],
103 "sk_xprt.xpt_lock-AF_INET6-NFSD",
104 &svc_key[1]);
105 break;
106
107 default:
108 BUG();
109 }
110 }
111 #else
112 static void svc_reclassify_socket(struct socket *sock)
113 {
114 }
115 #endif
116
117 /*
118 * Release an skbuff after use
119 */
120 static void svc_release_skb(struct svc_rqst *rqstp)
121 {
122 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
123
124 if (skb) {
125 struct svc_sock *svsk =
126 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
127 rqstp->rq_xprt_ctxt = NULL;
128
129 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
130 skb_free_datagram_locked(svsk->sk_sk, skb);
131 }
132 }
133
134 union svc_pktinfo_u {
135 struct in_pktinfo pkti;
136 struct in6_pktinfo pkti6;
137 };
138 #define SVC_PKTINFO_SPACE \
139 CMSG_SPACE(sizeof(union svc_pktinfo_u))
140
141 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
142 {
143 struct svc_sock *svsk =
144 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
145 switch (svsk->sk_sk->sk_family) {
146 case AF_INET: {
147 struct in_pktinfo *pki = CMSG_DATA(cmh);
148
149 cmh->cmsg_level = SOL_IP;
150 cmh->cmsg_type = IP_PKTINFO;
151 pki->ipi_ifindex = 0;
152 pki->ipi_spec_dst.s_addr =
153 svc_daddr_in(rqstp)->sin_addr.s_addr;
154 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
155 }
156 break;
157
158 case AF_INET6: {
159 struct in6_pktinfo *pki = CMSG_DATA(cmh);
160 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
161
162 cmh->cmsg_level = SOL_IPV6;
163 cmh->cmsg_type = IPV6_PKTINFO;
164 pki->ipi6_ifindex = daddr->sin6_scope_id;
165 pki->ipi6_addr = daddr->sin6_addr;
166 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
167 }
168 break;
169 }
170 }
171
172 /*
173 * send routine intended to be shared by the fore- and back-channel
174 */
175 int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
176 struct page *headpage, unsigned long headoffset,
177 struct page *tailpage, unsigned long tailoffset)
178 {
179 int result;
180 int size;
181 struct page **ppage = xdr->pages;
182 size_t base = xdr->page_base;
183 unsigned int pglen = xdr->page_len;
184 unsigned int flags = MSG_MORE;
185 int slen;
186 int len = 0;
187
188 slen = xdr->len;
189
190 /* send head */
191 if (slen == xdr->head[0].iov_len)
192 flags = 0;
193 len = kernel_sendpage(sock, headpage, headoffset,
194 xdr->head[0].iov_len, flags);
195 if (len != xdr->head[0].iov_len)
196 goto out;
197 slen -= xdr->head[0].iov_len;
198 if (slen == 0)
199 goto out;
200
201 /* send page data */
202 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
203 while (pglen > 0) {
204 if (slen == size)
205 flags = 0;
206 result = kernel_sendpage(sock, *ppage, base, size, flags);
207 if (result > 0)
208 len += result;
209 if (result != size)
210 goto out;
211 slen -= size;
212 pglen -= size;
213 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
214 base = 0;
215 ppage++;
216 }
217
218 /* send tail */
219 if (xdr->tail[0].iov_len) {
220 result = kernel_sendpage(sock, tailpage, tailoffset,
221 xdr->tail[0].iov_len, 0);
222 if (result > 0)
223 len += result;
224 }
225
226 out:
227 return len;
228 }
229
230
231 /*
232 * Generic sendto routine
233 */
234 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
235 {
236 struct svc_sock *svsk =
237 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
238 struct socket *sock = svsk->sk_sock;
239 union {
240 struct cmsghdr hdr;
241 long all[SVC_PKTINFO_SPACE / sizeof(long)];
242 } buffer;
243 struct cmsghdr *cmh = &buffer.hdr;
244 int len = 0;
245 unsigned long tailoff;
246 unsigned long headoff;
247 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
248
249 if (rqstp->rq_prot == IPPROTO_UDP) {
250 struct msghdr msg = {
251 .msg_name = &rqstp->rq_addr,
252 .msg_namelen = rqstp->rq_addrlen,
253 .msg_control = cmh,
254 .msg_controllen = sizeof(buffer),
255 .msg_flags = MSG_MORE,
256 };
257
258 svc_set_cmsg_data(rqstp, cmh);
259
260 if (sock_sendmsg(sock, &msg, 0) < 0)
261 goto out;
262 }
263
264 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
265 headoff = 0;
266 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
267 rqstp->rq_respages[0], tailoff);
268
269 out:
270 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
271 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
272 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
273
274 return len;
275 }
276
277 /*
278 * Report socket names for nfsdfs
279 */
280 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
281 {
282 const struct sock *sk = svsk->sk_sk;
283 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
284 "udp" : "tcp";
285 int len;
286
287 switch (sk->sk_family) {
288 case PF_INET:
289 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
290 proto_name,
291 &inet_sk(sk)->inet_rcv_saddr,
292 inet_sk(sk)->inet_num);
293 break;
294 #if IS_ENABLED(CONFIG_IPV6)
295 case PF_INET6:
296 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
297 proto_name,
298 &sk->sk_v6_rcv_saddr,
299 inet_sk(sk)->inet_num);
300 break;
301 #endif
302 default:
303 len = snprintf(buf, remaining, "*unknown-%d*\n",
304 sk->sk_family);
305 }
306
307 if (len >= remaining) {
308 *buf = '\0';
309 return -ENAMETOOLONG;
310 }
311 return len;
312 }
313
314 /*
315 * Generic recvfrom routine.
316 */
317 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
318 int buflen)
319 {
320 struct svc_sock *svsk =
321 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
322 struct msghdr msg = {
323 .msg_flags = MSG_DONTWAIT,
324 };
325 int len;
326
327 rqstp->rq_xprt_hlen = 0;
328
329 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
330 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
331 msg.msg_flags);
332 /* If we read a full record, then assume there may be more
333 * data to read (stream based sockets only!)
334 */
335 if (len == buflen)
336 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
337
338 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
339 svsk, iov[0].iov_base, iov[0].iov_len, len);
340 return len;
341 }
342
343 static int svc_partial_recvfrom(struct svc_rqst *rqstp,
344 struct kvec *iov, int nr,
345 int buflen, unsigned int base)
346 {
347 size_t save_iovlen;
348 void *save_iovbase;
349 unsigned int i;
350 int ret;
351
352 if (base == 0)
353 return svc_recvfrom(rqstp, iov, nr, buflen);
354
355 for (i = 0; i < nr; i++) {
356 if (iov[i].iov_len > base)
357 break;
358 base -= iov[i].iov_len;
359 }
360 save_iovlen = iov[i].iov_len;
361 save_iovbase = iov[i].iov_base;
362 iov[i].iov_len -= base;
363 iov[i].iov_base += base;
364 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
365 iov[i].iov_len = save_iovlen;
366 iov[i].iov_base = save_iovbase;
367 return ret;
368 }
369
370 /*
371 * Set socket snd and rcv buffer lengths
372 */
373 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
374 unsigned int rcv)
375 {
376 #if 0
377 mm_segment_t oldfs;
378 oldfs = get_fs(); set_fs(KERNEL_DS);
379 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
380 (char*)&snd, sizeof(snd));
381 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
382 (char*)&rcv, sizeof(rcv));
383 #else
384 /* sock_setsockopt limits use to sysctl_?mem_max,
385 * which isn't acceptable. Until that is made conditional
386 * on not having CAP_SYS_RESOURCE or similar, we go direct...
387 * DaveM said I could!
388 */
389 lock_sock(sock->sk);
390 sock->sk->sk_sndbuf = snd * 2;
391 sock->sk->sk_rcvbuf = rcv * 2;
392 sock->sk->sk_write_space(sock->sk);
393 release_sock(sock->sk);
394 #endif
395 }
396
397 static int svc_sock_secure_port(struct svc_rqst *rqstp)
398 {
399 return svc_port_is_privileged(svc_addr(rqstp));
400 }
401
402 /*
403 * INET callback when data has been received on the socket.
404 */
405 static void svc_udp_data_ready(struct sock *sk)
406 {
407 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
408 wait_queue_head_t *wq = sk_sleep(sk);
409
410 if (svsk) {
411 dprintk("svc: socket %p(inet %p), busy=%d\n",
412 svsk, sk,
413 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
414 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
415 svc_xprt_enqueue(&svsk->sk_xprt);
416 }
417 if (wq && waitqueue_active(wq))
418 wake_up_interruptible(wq);
419 }
420
421 /*
422 * INET callback when space is newly available on the socket.
423 */
424 static void svc_write_space(struct sock *sk)
425 {
426 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
427 wait_queue_head_t *wq = sk_sleep(sk);
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 svc_xprt_enqueue(&svsk->sk_xprt);
433 }
434
435 if (wq && waitqueue_active(wq)) {
436 dprintk("RPC svc_write_space: someone sleeping on %p\n",
437 svsk);
438 wake_up_interruptible(wq);
439 }
440 }
441
442 static int svc_tcp_has_wspace(struct svc_xprt *xprt)
443 {
444 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
445 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
446 int required;
447
448 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
449 return 1;
450 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
451 if (sk_stream_wspace(svsk->sk_sk) >= required ||
452 (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
453 atomic_read(&xprt->xpt_reserved) == 0))
454 return 1;
455 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
456 return 0;
457 }
458
459 static void svc_tcp_write_space(struct sock *sk)
460 {
461 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
462 struct socket *sock = sk->sk_socket;
463
464 if (!sk_stream_is_writeable(sk) || !sock)
465 return;
466 if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt))
467 clear_bit(SOCK_NOSPACE, &sock->flags);
468 svc_write_space(sk);
469 }
470
471 static void svc_tcp_adjust_wspace(struct svc_xprt *xprt)
472 {
473 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
474
475 if (svc_tcp_has_wspace(xprt))
476 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
477 }
478
479 /*
480 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
481 */
482 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
483 struct cmsghdr *cmh)
484 {
485 struct in_pktinfo *pki = CMSG_DATA(cmh);
486 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
487
488 if (cmh->cmsg_type != IP_PKTINFO)
489 return 0;
490
491 daddr->sin_family = AF_INET;
492 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
493 return 1;
494 }
495
496 /*
497 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
498 */
499 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
500 struct cmsghdr *cmh)
501 {
502 struct in6_pktinfo *pki = CMSG_DATA(cmh);
503 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
504
505 if (cmh->cmsg_type != IPV6_PKTINFO)
506 return 0;
507
508 daddr->sin6_family = AF_INET6;
509 daddr->sin6_addr = pki->ipi6_addr;
510 daddr->sin6_scope_id = pki->ipi6_ifindex;
511 return 1;
512 }
513
514 /*
515 * Copy the UDP datagram's destination address to the rqstp structure.
516 * The 'destination' address in this case is the address to which the
517 * peer sent the datagram, i.e. our local address. For multihomed
518 * hosts, this can change from msg to msg. Note that only the IP
519 * address changes, the port number should remain the same.
520 */
521 static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
522 struct cmsghdr *cmh)
523 {
524 switch (cmh->cmsg_level) {
525 case SOL_IP:
526 return svc_udp_get_dest_address4(rqstp, cmh);
527 case SOL_IPV6:
528 return svc_udp_get_dest_address6(rqstp, cmh);
529 }
530
531 return 0;
532 }
533
534 /*
535 * Receive a datagram from a UDP socket.
536 */
537 static int svc_udp_recvfrom(struct svc_rqst *rqstp)
538 {
539 struct svc_sock *svsk =
540 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
541 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
542 struct sk_buff *skb;
543 union {
544 struct cmsghdr hdr;
545 long all[SVC_PKTINFO_SPACE / sizeof(long)];
546 } buffer;
547 struct cmsghdr *cmh = &buffer.hdr;
548 struct msghdr msg = {
549 .msg_name = svc_addr(rqstp),
550 .msg_control = cmh,
551 .msg_controllen = sizeof(buffer),
552 .msg_flags = MSG_DONTWAIT,
553 };
554 size_t len;
555 int err;
556
557 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
558 /* udp sockets need large rcvbuf as all pending
559 * requests are still in that buffer. sndbuf must
560 * also be large enough that there is enough space
561 * for one reply per thread. We count all threads
562 * rather than threads in a particular pool, which
563 * provides an upper bound on the number of threads
564 * which will access the socket.
565 */
566 svc_sock_setbufsize(svsk->sk_sock,
567 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
568 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
569
570 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
571 skb = NULL;
572 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
573 0, 0, MSG_PEEK | MSG_DONTWAIT);
574 if (err >= 0)
575 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
576
577 if (skb == NULL) {
578 if (err != -EAGAIN) {
579 /* possibly an icmp error */
580 dprintk("svc: recvfrom returned error %d\n", -err);
581 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
582 }
583 return 0;
584 }
585 len = svc_addr_len(svc_addr(rqstp));
586 rqstp->rq_addrlen = len;
587 if (skb->tstamp.tv64 == 0) {
588 skb->tstamp = ktime_get_real();
589 /* Don't enable netstamp, sunrpc doesn't
590 need that much accuracy */
591 }
592 svsk->sk_sk->sk_stamp = skb->tstamp;
593 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
594
595 len = skb->len - sizeof(struct udphdr);
596 rqstp->rq_arg.len = len;
597
598 rqstp->rq_prot = IPPROTO_UDP;
599
600 if (!svc_udp_get_dest_address(rqstp, cmh)) {
601 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
602 cmh->cmsg_level, cmh->cmsg_type);
603 goto out_free;
604 }
605 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
606
607 if (skb_is_nonlinear(skb)) {
608 /* we have to copy */
609 local_bh_disable();
610 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
611 local_bh_enable();
612 /* checksum error */
613 goto out_free;
614 }
615 local_bh_enable();
616 skb_free_datagram_locked(svsk->sk_sk, skb);
617 } else {
618 /* we can use it in-place */
619 rqstp->rq_arg.head[0].iov_base = skb->data +
620 sizeof(struct udphdr);
621 rqstp->rq_arg.head[0].iov_len = len;
622 if (skb_checksum_complete(skb))
623 goto out_free;
624 rqstp->rq_xprt_ctxt = skb;
625 }
626
627 rqstp->rq_arg.page_base = 0;
628 if (len <= rqstp->rq_arg.head[0].iov_len) {
629 rqstp->rq_arg.head[0].iov_len = len;
630 rqstp->rq_arg.page_len = 0;
631 rqstp->rq_respages = rqstp->rq_pages+1;
632 } else {
633 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
634 rqstp->rq_respages = rqstp->rq_pages + 1 +
635 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
636 }
637 rqstp->rq_next_page = rqstp->rq_respages+1;
638
639 if (serv->sv_stats)
640 serv->sv_stats->netudpcnt++;
641
642 return len;
643 out_free:
644 trace_kfree_skb(skb, svc_udp_recvfrom);
645 skb_free_datagram_locked(svsk->sk_sk, skb);
646 return 0;
647 }
648
649 static int
650 svc_udp_sendto(struct svc_rqst *rqstp)
651 {
652 int error;
653
654 error = svc_sendto(rqstp, &rqstp->rq_res);
655 if (error == -ECONNREFUSED)
656 /* ICMP error on earlier request. */
657 error = svc_sendto(rqstp, &rqstp->rq_res);
658
659 return error;
660 }
661
662 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
663 {
664 }
665
666 static int svc_udp_has_wspace(struct svc_xprt *xprt)
667 {
668 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
669 struct svc_serv *serv = xprt->xpt_server;
670 unsigned long required;
671
672 /*
673 * Set the SOCK_NOSPACE flag before checking the available
674 * sock space.
675 */
676 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
677 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
678 if (required*2 > sock_wspace(svsk->sk_sk))
679 return 0;
680 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
681 return 1;
682 }
683
684 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
685 {
686 BUG();
687 return NULL;
688 }
689
690 static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
691 struct net *net,
692 struct sockaddr *sa, int salen,
693 int flags)
694 {
695 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
696 }
697
698 static struct svc_xprt_ops svc_udp_ops = {
699 .xpo_create = svc_udp_create,
700 .xpo_recvfrom = svc_udp_recvfrom,
701 .xpo_sendto = svc_udp_sendto,
702 .xpo_release_rqst = svc_release_skb,
703 .xpo_detach = svc_sock_detach,
704 .xpo_free = svc_sock_free,
705 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
706 .xpo_has_wspace = svc_udp_has_wspace,
707 .xpo_accept = svc_udp_accept,
708 .xpo_secure_port = svc_sock_secure_port,
709 };
710
711 static struct svc_xprt_class svc_udp_class = {
712 .xcl_name = "udp",
713 .xcl_owner = THIS_MODULE,
714 .xcl_ops = &svc_udp_ops,
715 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
716 .xcl_ident = XPRT_TRANSPORT_UDP,
717 };
718
719 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
720 {
721 int err, level, optname, one = 1;
722
723 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
724 &svsk->sk_xprt, serv);
725 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
726 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
727 svsk->sk_sk->sk_write_space = svc_write_space;
728
729 /* initialise setting must have enough space to
730 * receive and respond to one request.
731 * svc_udp_recvfrom will re-adjust if necessary
732 */
733 svc_sock_setbufsize(svsk->sk_sock,
734 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
735 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
736
737 /* data might have come in before data_ready set up */
738 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
739 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
740
741 /* make sure we get destination address info */
742 switch (svsk->sk_sk->sk_family) {
743 case AF_INET:
744 level = SOL_IP;
745 optname = IP_PKTINFO;
746 break;
747 case AF_INET6:
748 level = SOL_IPV6;
749 optname = IPV6_RECVPKTINFO;
750 break;
751 default:
752 BUG();
753 }
754 err = kernel_setsockopt(svsk->sk_sock, level, optname,
755 (char *)&one, sizeof(one));
756 dprintk("svc: kernel_setsockopt returned %d\n", err);
757 }
758
759 /*
760 * A data_ready event on a listening socket means there's a connection
761 * pending. Do not use state_change as a substitute for it.
762 */
763 static void svc_tcp_listen_data_ready(struct sock *sk)
764 {
765 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
766 wait_queue_head_t *wq;
767
768 dprintk("svc: socket %p TCP (listen) state change %d\n",
769 sk, sk->sk_state);
770
771 /*
772 * This callback may called twice when a new connection
773 * is established as a child socket inherits everything
774 * from a parent LISTEN socket.
775 * 1) data_ready method of the parent socket will be called
776 * when one of child sockets become ESTABLISHED.
777 * 2) data_ready method of the child socket may be called
778 * when it receives data before the socket is accepted.
779 * In case of 2, we should ignore it silently.
780 */
781 if (sk->sk_state == TCP_LISTEN) {
782 if (svsk) {
783 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
784 svc_xprt_enqueue(&svsk->sk_xprt);
785 } else
786 printk("svc: socket %p: no user data\n", sk);
787 }
788
789 wq = sk_sleep(sk);
790 if (wq && waitqueue_active(wq))
791 wake_up_interruptible_all(wq);
792 }
793
794 /*
795 * A state change on a connected socket means it's dying or dead.
796 */
797 static void svc_tcp_state_change(struct sock *sk)
798 {
799 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
800 wait_queue_head_t *wq = sk_sleep(sk);
801
802 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
803 sk, sk->sk_state, sk->sk_user_data);
804
805 if (!svsk)
806 printk("svc: socket %p: no user data\n", sk);
807 else {
808 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
809 svc_xprt_enqueue(&svsk->sk_xprt);
810 }
811 if (wq && waitqueue_active(wq))
812 wake_up_interruptible_all(wq);
813 }
814
815 static void svc_tcp_data_ready(struct sock *sk)
816 {
817 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
818 wait_queue_head_t *wq = sk_sleep(sk);
819
820 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
821 sk, sk->sk_user_data);
822 if (svsk) {
823 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
824 svc_xprt_enqueue(&svsk->sk_xprt);
825 }
826 if (wq && waitqueue_active(wq))
827 wake_up_interruptible(wq);
828 }
829
830 /*
831 * Accept a TCP connection
832 */
833 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
834 {
835 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
836 struct sockaddr_storage addr;
837 struct sockaddr *sin = (struct sockaddr *) &addr;
838 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
839 struct socket *sock = svsk->sk_sock;
840 struct socket *newsock;
841 struct svc_sock *newsvsk;
842 int err, slen;
843 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
844
845 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
846 if (!sock)
847 return NULL;
848
849 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
850 err = kernel_accept(sock, &newsock, O_NONBLOCK);
851 if (err < 0) {
852 if (err == -ENOMEM)
853 printk(KERN_WARNING "%s: no more sockets!\n",
854 serv->sv_name);
855 else if (err != -EAGAIN)
856 net_warn_ratelimited("%s: accept failed (err %d)!\n",
857 serv->sv_name, -err);
858 return NULL;
859 }
860 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
861
862 err = kernel_getpeername(newsock, sin, &slen);
863 if (err < 0) {
864 net_warn_ratelimited("%s: peername failed (err %d)!\n",
865 serv->sv_name, -err);
866 goto failed; /* aborted connection or whatever */
867 }
868
869 /* Ideally, we would want to reject connections from unauthorized
870 * hosts here, but when we get encryption, the IP of the host won't
871 * tell us anything. For now just warn about unpriv connections.
872 */
873 if (!svc_port_is_privileged(sin)) {
874 dprintk("%s: connect from unprivileged port: %s\n",
875 serv->sv_name,
876 __svc_print_addr(sin, buf, sizeof(buf)));
877 }
878 dprintk("%s: connect from %s\n", serv->sv_name,
879 __svc_print_addr(sin, buf, sizeof(buf)));
880
881 /* make sure that a write doesn't block forever when
882 * low on memory
883 */
884 newsock->sk->sk_sndtimeo = HZ*30;
885
886 newsvsk = svc_setup_socket(serv, newsock,
887 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
888 if (IS_ERR(newsvsk))
889 goto failed;
890 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
891 err = kernel_getsockname(newsock, sin, &slen);
892 if (unlikely(err < 0)) {
893 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
894 slen = offsetof(struct sockaddr, sa_data);
895 }
896 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
897
898 if (sock_is_loopback(newsock->sk))
899 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
900 else
901 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
902 if (serv->sv_stats)
903 serv->sv_stats->nettcpconn++;
904
905 return &newsvsk->sk_xprt;
906
907 failed:
908 sock_release(newsock);
909 return NULL;
910 }
911
912 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
913 {
914 unsigned int i, len, npages;
915
916 if (svsk->sk_datalen == 0)
917 return 0;
918 len = svsk->sk_datalen;
919 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
920 for (i = 0; i < npages; i++) {
921 if (rqstp->rq_pages[i] != NULL)
922 put_page(rqstp->rq_pages[i]);
923 BUG_ON(svsk->sk_pages[i] == NULL);
924 rqstp->rq_pages[i] = svsk->sk_pages[i];
925 svsk->sk_pages[i] = NULL;
926 }
927 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
928 return len;
929 }
930
931 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
932 {
933 unsigned int i, len, npages;
934
935 if (svsk->sk_datalen == 0)
936 return;
937 len = svsk->sk_datalen;
938 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
939 for (i = 0; i < npages; i++) {
940 svsk->sk_pages[i] = rqstp->rq_pages[i];
941 rqstp->rq_pages[i] = NULL;
942 }
943 }
944
945 static void svc_tcp_clear_pages(struct svc_sock *svsk)
946 {
947 unsigned int i, len, npages;
948
949 if (svsk->sk_datalen == 0)
950 goto out;
951 len = svsk->sk_datalen;
952 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
953 for (i = 0; i < npages; i++) {
954 if (svsk->sk_pages[i] == NULL) {
955 WARN_ON_ONCE(1);
956 continue;
957 }
958 put_page(svsk->sk_pages[i]);
959 svsk->sk_pages[i] = NULL;
960 }
961 out:
962 svsk->sk_tcplen = 0;
963 svsk->sk_datalen = 0;
964 }
965
966 /*
967 * Receive fragment record header.
968 * If we haven't gotten the record length yet, get the next four bytes.
969 */
970 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
971 {
972 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
973 unsigned int want;
974 int len;
975
976 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
977 struct kvec iov;
978
979 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
980 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
981 iov.iov_len = want;
982 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
983 goto error;
984 svsk->sk_tcplen += len;
985
986 if (len < want) {
987 dprintk("svc: short recvfrom while reading record "
988 "length (%d of %d)\n", len, want);
989 return -EAGAIN;
990 }
991
992 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
993 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
994 serv->sv_max_mesg) {
995 net_notice_ratelimited("RPC: fragment too large: %d\n",
996 svc_sock_reclen(svsk));
997 goto err_delete;
998 }
999 }
1000
1001 return svc_sock_reclen(svsk);
1002 error:
1003 dprintk("RPC: TCP recv_record got %d\n", len);
1004 return len;
1005 err_delete:
1006 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1007 return -EAGAIN;
1008 }
1009
1010 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
1011 {
1012 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
1013 struct rpc_rqst *req = NULL;
1014 struct kvec *src, *dst;
1015 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1016 __be32 xid;
1017 __be32 calldir;
1018
1019 xid = *p++;
1020 calldir = *p;
1021
1022 if (bc_xprt)
1023 req = xprt_lookup_rqst(bc_xprt, xid);
1024
1025 if (!req) {
1026 printk(KERN_NOTICE
1027 "%s: Got unrecognized reply: "
1028 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1029 __func__, ntohl(calldir),
1030 bc_xprt, ntohl(xid));
1031 return -EAGAIN;
1032 }
1033
1034 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1035 /*
1036 * XXX!: cheating for now! Only copying HEAD.
1037 * But we know this is good enough for now (in fact, for any
1038 * callback reply in the forseeable future).
1039 */
1040 dst = &req->rq_private_buf.head[0];
1041 src = &rqstp->rq_arg.head[0];
1042 if (dst->iov_len < src->iov_len)
1043 return -EAGAIN; /* whatever; just giving up. */
1044 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1045 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1046 rqstp->rq_arg.len = 0;
1047 return 0;
1048 }
1049
1050 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1051 {
1052 int i = 0;
1053 int t = 0;
1054
1055 while (t < len) {
1056 vec[i].iov_base = page_address(pages[i]);
1057 vec[i].iov_len = PAGE_SIZE;
1058 i++;
1059 t += PAGE_SIZE;
1060 }
1061 return i;
1062 }
1063
1064 static void svc_tcp_fragment_received(struct svc_sock *svsk)
1065 {
1066 /* If we have more data, signal svc_xprt_enqueue() to try again */
1067 dprintk("svc: TCP %s record (%d bytes)\n",
1068 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1069 svc_sock_reclen(svsk));
1070 svsk->sk_tcplen = 0;
1071 svsk->sk_reclen = 0;
1072 }
1073
1074 /*
1075 * Receive data from a TCP socket.
1076 */
1077 static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1078 {
1079 struct svc_sock *svsk =
1080 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1081 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1082 int len;
1083 struct kvec *vec;
1084 unsigned int want, base;
1085 __be32 *p;
1086 __be32 calldir;
1087 int pnum;
1088
1089 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1090 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1091 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1092 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1093
1094 len = svc_tcp_recv_record(svsk, rqstp);
1095 if (len < 0)
1096 goto error;
1097
1098 base = svc_tcp_restore_pages(svsk, rqstp);
1099 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1100
1101 vec = rqstp->rq_vec;
1102
1103 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1104 svsk->sk_datalen + want);
1105
1106 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1107 rqstp->rq_next_page = rqstp->rq_respages + 1;
1108
1109 /* Now receive data */
1110 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1111 if (len >= 0) {
1112 svsk->sk_tcplen += len;
1113 svsk->sk_datalen += len;
1114 }
1115 if (len != want || !svc_sock_final_rec(svsk)) {
1116 svc_tcp_save_pages(svsk, rqstp);
1117 if (len < 0 && len != -EAGAIN)
1118 goto err_delete;
1119 if (len == want)
1120 svc_tcp_fragment_received(svsk);
1121 else
1122 dprintk("svc: incomplete TCP record (%d of %d)\n",
1123 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1124 svc_sock_reclen(svsk));
1125 goto err_noclose;
1126 }
1127
1128 if (svsk->sk_datalen < 8) {
1129 svsk->sk_datalen = 0;
1130 goto err_delete; /* client is nuts. */
1131 }
1132
1133 rqstp->rq_arg.len = svsk->sk_datalen;
1134 rqstp->rq_arg.page_base = 0;
1135 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1136 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1137 rqstp->rq_arg.page_len = 0;
1138 } else
1139 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1140
1141 rqstp->rq_xprt_ctxt = NULL;
1142 rqstp->rq_prot = IPPROTO_TCP;
1143 rqstp->rq_local = !!test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags);
1144
1145 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1146 calldir = p[1];
1147 if (calldir)
1148 len = receive_cb_reply(svsk, rqstp);
1149
1150 /* Reset TCP read info */
1151 svsk->sk_datalen = 0;
1152 svc_tcp_fragment_received(svsk);
1153
1154 if (len < 0)
1155 goto error;
1156
1157 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1158 if (serv->sv_stats)
1159 serv->sv_stats->nettcpcnt++;
1160
1161 return rqstp->rq_arg.len;
1162
1163 error:
1164 if (len != -EAGAIN)
1165 goto err_delete;
1166 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1167 return 0;
1168 err_delete:
1169 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1170 svsk->sk_xprt.xpt_server->sv_name, -len);
1171 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1172 err_noclose:
1173 return 0; /* record not complete */
1174 }
1175
1176 /*
1177 * Send out data on TCP socket.
1178 */
1179 static int svc_tcp_sendto(struct svc_rqst *rqstp)
1180 {
1181 struct xdr_buf *xbufp = &rqstp->rq_res;
1182 int sent;
1183 __be32 reclen;
1184
1185 /* Set up the first element of the reply kvec.
1186 * Any other kvecs that may be in use have been taken
1187 * care of by the server implementation itself.
1188 */
1189 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1190 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1191
1192 sent = svc_sendto(rqstp, &rqstp->rq_res);
1193 if (sent != xbufp->len) {
1194 printk(KERN_NOTICE
1195 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1196 "- shutting down socket\n",
1197 rqstp->rq_xprt->xpt_server->sv_name,
1198 (sent<0)?"got error":"sent only",
1199 sent, xbufp->len);
1200 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1201 svc_xprt_enqueue(rqstp->rq_xprt);
1202 sent = -EAGAIN;
1203 }
1204 return sent;
1205 }
1206
1207 /*
1208 * Setup response header. TCP has a 4B record length field.
1209 */
1210 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1211 {
1212 struct kvec *resv = &rqstp->rq_res.head[0];
1213
1214 /* tcp needs a space for the record length... */
1215 svc_putnl(resv, 0);
1216 }
1217
1218 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1219 struct net *net,
1220 struct sockaddr *sa, int salen,
1221 int flags)
1222 {
1223 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1224 }
1225
1226 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1227 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1228 struct net *, struct sockaddr *,
1229 int, int);
1230 static void svc_bc_sock_free(struct svc_xprt *xprt);
1231
1232 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1233 struct net *net,
1234 struct sockaddr *sa, int salen,
1235 int flags)
1236 {
1237 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1238 }
1239
1240 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1241 {
1242 }
1243
1244 static struct svc_xprt_ops svc_tcp_bc_ops = {
1245 .xpo_create = svc_bc_tcp_create,
1246 .xpo_detach = svc_bc_tcp_sock_detach,
1247 .xpo_free = svc_bc_sock_free,
1248 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1249 .xpo_secure_port = svc_sock_secure_port,
1250 };
1251
1252 static struct svc_xprt_class svc_tcp_bc_class = {
1253 .xcl_name = "tcp-bc",
1254 .xcl_owner = THIS_MODULE,
1255 .xcl_ops = &svc_tcp_bc_ops,
1256 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1257 };
1258
1259 static void svc_init_bc_xprt_sock(void)
1260 {
1261 svc_reg_xprt_class(&svc_tcp_bc_class);
1262 }
1263
1264 static void svc_cleanup_bc_xprt_sock(void)
1265 {
1266 svc_unreg_xprt_class(&svc_tcp_bc_class);
1267 }
1268 #else /* CONFIG_SUNRPC_BACKCHANNEL */
1269 static void svc_init_bc_xprt_sock(void)
1270 {
1271 }
1272
1273 static void svc_cleanup_bc_xprt_sock(void)
1274 {
1275 }
1276 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1277
1278 static struct svc_xprt_ops svc_tcp_ops = {
1279 .xpo_create = svc_tcp_create,
1280 .xpo_recvfrom = svc_tcp_recvfrom,
1281 .xpo_sendto = svc_tcp_sendto,
1282 .xpo_release_rqst = svc_release_skb,
1283 .xpo_detach = svc_tcp_sock_detach,
1284 .xpo_free = svc_sock_free,
1285 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1286 .xpo_has_wspace = svc_tcp_has_wspace,
1287 .xpo_accept = svc_tcp_accept,
1288 .xpo_secure_port = svc_sock_secure_port,
1289 .xpo_adjust_wspace = svc_tcp_adjust_wspace,
1290 };
1291
1292 static struct svc_xprt_class svc_tcp_class = {
1293 .xcl_name = "tcp",
1294 .xcl_owner = THIS_MODULE,
1295 .xcl_ops = &svc_tcp_ops,
1296 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1297 .xcl_ident = XPRT_TRANSPORT_TCP,
1298 };
1299
1300 void svc_init_xprt_sock(void)
1301 {
1302 svc_reg_xprt_class(&svc_tcp_class);
1303 svc_reg_xprt_class(&svc_udp_class);
1304 svc_init_bc_xprt_sock();
1305 }
1306
1307 void svc_cleanup_xprt_sock(void)
1308 {
1309 svc_unreg_xprt_class(&svc_tcp_class);
1310 svc_unreg_xprt_class(&svc_udp_class);
1311 svc_cleanup_bc_xprt_sock();
1312 }
1313
1314 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1315 {
1316 struct sock *sk = svsk->sk_sk;
1317
1318 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1319 &svsk->sk_xprt, serv);
1320 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1321 if (sk->sk_state == TCP_LISTEN) {
1322 dprintk("setting up TCP socket for listening\n");
1323 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1324 sk->sk_data_ready = svc_tcp_listen_data_ready;
1325 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1326 } else {
1327 dprintk("setting up TCP socket for reading\n");
1328 sk->sk_state_change = svc_tcp_state_change;
1329 sk->sk_data_ready = svc_tcp_data_ready;
1330 sk->sk_write_space = svc_tcp_write_space;
1331
1332 svsk->sk_reclen = 0;
1333 svsk->sk_tcplen = 0;
1334 svsk->sk_datalen = 0;
1335 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1336
1337 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1338
1339 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1340 if (sk->sk_state != TCP_ESTABLISHED)
1341 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1342 }
1343 }
1344
1345 void svc_sock_update_bufs(struct svc_serv *serv)
1346 {
1347 /*
1348 * The number of server threads has changed. Update
1349 * rcvbuf and sndbuf accordingly on all sockets
1350 */
1351 struct svc_sock *svsk;
1352
1353 spin_lock_bh(&serv->sv_lock);
1354 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1355 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1356 spin_unlock_bh(&serv->sv_lock);
1357 }
1358 EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1359
1360 /*
1361 * Initialize socket for RPC use and create svc_sock struct
1362 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1363 */
1364 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1365 struct socket *sock,
1366 int flags)
1367 {
1368 struct svc_sock *svsk;
1369 struct sock *inet;
1370 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1371 int err = 0;
1372
1373 dprintk("svc: svc_setup_socket %p\n", sock);
1374 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1375 if (!svsk)
1376 return ERR_PTR(-ENOMEM);
1377
1378 inet = sock->sk;
1379
1380 /* Register socket with portmapper */
1381 if (pmap_register)
1382 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1383 inet->sk_protocol,
1384 ntohs(inet_sk(inet)->inet_sport));
1385
1386 if (err < 0) {
1387 kfree(svsk);
1388 return ERR_PTR(err);
1389 }
1390
1391 inet->sk_user_data = svsk;
1392 svsk->sk_sock = sock;
1393 svsk->sk_sk = inet;
1394 svsk->sk_ostate = inet->sk_state_change;
1395 svsk->sk_odata = inet->sk_data_ready;
1396 svsk->sk_owspace = inet->sk_write_space;
1397
1398 /* Initialize the socket */
1399 if (sock->type == SOCK_DGRAM)
1400 svc_udp_init(svsk, serv);
1401 else {
1402 /* initialise setting must have enough space to
1403 * receive and respond to one request.
1404 */
1405 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1406 4 * serv->sv_max_mesg);
1407 svc_tcp_init(svsk, serv);
1408 }
1409
1410 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1411 svsk, svsk->sk_sk);
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 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1475 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1476 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1477 return svc_one_sock_name(svsk, name_return, len);
1478 out:
1479 sockfd_put(so);
1480 return err;
1481 }
1482 EXPORT_SYMBOL_GPL(svc_addsock);
1483
1484 /*
1485 * Create socket for RPC service.
1486 */
1487 static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1488 int protocol,
1489 struct net *net,
1490 struct sockaddr *sin, int len,
1491 int flags)
1492 {
1493 struct svc_sock *svsk;
1494 struct socket *sock;
1495 int error;
1496 int type;
1497 struct sockaddr_storage addr;
1498 struct sockaddr *newsin = (struct sockaddr *)&addr;
1499 int newlen;
1500 int family;
1501 int val;
1502 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1503
1504 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1505 serv->sv_program->pg_name, protocol,
1506 __svc_print_addr(sin, buf, sizeof(buf)));
1507
1508 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1509 printk(KERN_WARNING "svc: only UDP and TCP "
1510 "sockets supported\n");
1511 return ERR_PTR(-EINVAL);
1512 }
1513
1514 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1515 switch (sin->sa_family) {
1516 case AF_INET6:
1517 family = PF_INET6;
1518 break;
1519 case AF_INET:
1520 family = PF_INET;
1521 break;
1522 default:
1523 return ERR_PTR(-EINVAL);
1524 }
1525
1526 error = __sock_create(net, family, type, protocol, &sock, 1);
1527 if (error < 0)
1528 return ERR_PTR(error);
1529
1530 svc_reclassify_socket(sock);
1531
1532 /*
1533 * If this is an PF_INET6 listener, we want to avoid
1534 * getting requests from IPv4 remotes. Those should
1535 * be shunted to a PF_INET listener via rpcbind.
1536 */
1537 val = 1;
1538 if (family == PF_INET6)
1539 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1540 (char *)&val, sizeof(val));
1541
1542 if (type == SOCK_STREAM)
1543 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1544 error = kernel_bind(sock, sin, len);
1545 if (error < 0)
1546 goto bummer;
1547
1548 newlen = len;
1549 error = kernel_getsockname(sock, newsin, &newlen);
1550 if (error < 0)
1551 goto bummer;
1552
1553 if (protocol == IPPROTO_TCP) {
1554 if ((error = kernel_listen(sock, 64)) < 0)
1555 goto bummer;
1556 }
1557
1558 svsk = svc_setup_socket(serv, sock, flags);
1559 if (IS_ERR(svsk)) {
1560 error = PTR_ERR(svsk);
1561 goto bummer;
1562 }
1563 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1564 return (struct svc_xprt *)svsk;
1565 bummer:
1566 dprintk("svc: svc_create_socket error = %d\n", -error);
1567 sock_release(sock);
1568 return ERR_PTR(error);
1569 }
1570
1571 /*
1572 * Detach the svc_sock from the socket so that no
1573 * more callbacks occur.
1574 */
1575 static void svc_sock_detach(struct svc_xprt *xprt)
1576 {
1577 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1578 struct sock *sk = svsk->sk_sk;
1579 wait_queue_head_t *wq;
1580
1581 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1582
1583 /* put back the old socket callbacks */
1584 sk->sk_state_change = svsk->sk_ostate;
1585 sk->sk_data_ready = svsk->sk_odata;
1586 sk->sk_write_space = svsk->sk_owspace;
1587
1588 wq = sk_sleep(sk);
1589 if (wq && waitqueue_active(wq))
1590 wake_up_interruptible(wq);
1591 }
1592
1593 /*
1594 * Disconnect the socket, and reset the callbacks
1595 */
1596 static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1597 {
1598 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1599
1600 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1601
1602 svc_sock_detach(xprt);
1603
1604 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1605 svc_tcp_clear_pages(svsk);
1606 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1607 }
1608 }
1609
1610 /*
1611 * Free the svc_sock's socket resources and the svc_sock itself.
1612 */
1613 static void svc_sock_free(struct svc_xprt *xprt)
1614 {
1615 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1616 dprintk("svc: svc_sock_free(%p)\n", svsk);
1617
1618 if (svsk->sk_sock->file)
1619 sockfd_put(svsk->sk_sock);
1620 else
1621 sock_release(svsk->sk_sock);
1622 kfree(svsk);
1623 }
1624
1625 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1626 /*
1627 * Create a back channel svc_xprt which shares the fore channel socket.
1628 */
1629 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1630 int protocol,
1631 struct net *net,
1632 struct sockaddr *sin, int len,
1633 int flags)
1634 {
1635 struct svc_sock *svsk;
1636 struct svc_xprt *xprt;
1637
1638 if (protocol != IPPROTO_TCP) {
1639 printk(KERN_WARNING "svc: only TCP sockets"
1640 " supported on shared back channel\n");
1641 return ERR_PTR(-EINVAL);
1642 }
1643
1644 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1645 if (!svsk)
1646 return ERR_PTR(-ENOMEM);
1647
1648 xprt = &svsk->sk_xprt;
1649 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
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 */
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