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Merge branch 'davem-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <asm/uaccess.h>
38
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
43 #include <net/raw.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
46 #include <net/xfrm.h>
47
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
50 #include "udp_impl.h"
51
52 int udp_v6_get_port(struct sock *sk, unsigned short snum)
53 {
54 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
55 }
56
57 static struct sock *__udp6_lib_lookup(struct net *net,
58 struct in6_addr *saddr, __be16 sport,
59 struct in6_addr *daddr, __be16 dport,
60 int dif, struct hlist_head udptable[])
61 {
62 struct sock *sk, *result = NULL;
63 struct hlist_node *node;
64 unsigned short hnum = ntohs(dport);
65 int badness = -1;
66
67 read_lock(&udp_hash_lock);
68 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
69 struct inet_sock *inet = inet_sk(sk);
70
71 if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
72 sk->sk_family == PF_INET6) {
73 struct ipv6_pinfo *np = inet6_sk(sk);
74 int score = 0;
75 if (inet->dport) {
76 if (inet->dport != sport)
77 continue;
78 score++;
79 }
80 if (!ipv6_addr_any(&np->rcv_saddr)) {
81 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
82 continue;
83 score++;
84 }
85 if (!ipv6_addr_any(&np->daddr)) {
86 if (!ipv6_addr_equal(&np->daddr, saddr))
87 continue;
88 score++;
89 }
90 if (sk->sk_bound_dev_if) {
91 if (sk->sk_bound_dev_if != dif)
92 continue;
93 score++;
94 }
95 if (score == 4) {
96 result = sk;
97 break;
98 } else if (score > badness) {
99 result = sk;
100 badness = score;
101 }
102 }
103 }
104 if (result)
105 sock_hold(result);
106 read_unlock(&udp_hash_lock);
107 return result;
108 }
109
110 /*
111 * This should be easy, if there is something there we
112 * return it, otherwise we block.
113 */
114
115 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
116 struct msghdr *msg, size_t len,
117 int noblock, int flags, int *addr_len)
118 {
119 struct ipv6_pinfo *np = inet6_sk(sk);
120 struct inet_sock *inet = inet_sk(sk);
121 struct sk_buff *skb;
122 unsigned int ulen, copied;
123 int peeked;
124 int err;
125 int is_udplite = IS_UDPLITE(sk);
126
127 if (addr_len)
128 *addr_len=sizeof(struct sockaddr_in6);
129
130 if (flags & MSG_ERRQUEUE)
131 return ipv6_recv_error(sk, msg, len);
132
133 try_again:
134 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
135 &peeked, &err);
136 if (!skb)
137 goto out;
138
139 ulen = skb->len - sizeof(struct udphdr);
140 copied = len;
141 if (copied > ulen)
142 copied = ulen;
143 else if (copied < ulen)
144 msg->msg_flags |= MSG_TRUNC;
145
146 /*
147 * If checksum is needed at all, try to do it while copying the
148 * data. If the data is truncated, or if we only want a partial
149 * coverage checksum (UDP-Lite), do it before the copy.
150 */
151
152 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
153 if (udp_lib_checksum_complete(skb))
154 goto csum_copy_err;
155 }
156
157 if (skb_csum_unnecessary(skb))
158 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
159 msg->msg_iov, copied );
160 else {
161 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
162 if (err == -EINVAL)
163 goto csum_copy_err;
164 }
165 if (err)
166 goto out_free;
167
168 if (!peeked)
169 UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
170
171 sock_recv_timestamp(msg, sk, skb);
172
173 /* Copy the address. */
174 if (msg->msg_name) {
175 struct sockaddr_in6 *sin6;
176
177 sin6 = (struct sockaddr_in6 *) msg->msg_name;
178 sin6->sin6_family = AF_INET6;
179 sin6->sin6_port = udp_hdr(skb)->source;
180 sin6->sin6_flowinfo = 0;
181 sin6->sin6_scope_id = 0;
182
183 if (skb->protocol == htons(ETH_P_IP))
184 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
185 htonl(0xffff), ip_hdr(skb)->saddr);
186 else {
187 ipv6_addr_copy(&sin6->sin6_addr,
188 &ipv6_hdr(skb)->saddr);
189 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
190 sin6->sin6_scope_id = IP6CB(skb)->iif;
191 }
192
193 }
194 if (skb->protocol == htons(ETH_P_IP)) {
195 if (inet->cmsg_flags)
196 ip_cmsg_recv(msg, skb);
197 } else {
198 if (np->rxopt.all)
199 datagram_recv_ctl(sk, msg, skb);
200 }
201
202 err = copied;
203 if (flags & MSG_TRUNC)
204 err = ulen;
205
206 out_free:
207 lock_sock(sk);
208 skb_free_datagram(sk, skb);
209 release_sock(sk);
210 out:
211 return err;
212
213 csum_copy_err:
214 lock_sock(sk);
215 if (!skb_kill_datagram(sk, skb, flags))
216 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
217 release_sock(sk);
218
219 if (flags & MSG_DONTWAIT)
220 return -EAGAIN;
221 goto try_again;
222 }
223
224 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
225 int type, int code, int offset, __be32 info,
226 struct hlist_head udptable[] )
227 {
228 struct ipv6_pinfo *np;
229 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
230 struct in6_addr *saddr = &hdr->saddr;
231 struct in6_addr *daddr = &hdr->daddr;
232 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
233 struct sock *sk;
234 int err;
235
236 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
237 saddr, uh->source, inet6_iif(skb), udptable);
238 if (sk == NULL)
239 return;
240
241 np = inet6_sk(sk);
242
243 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
244 goto out;
245
246 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
247 goto out;
248
249 if (np->recverr)
250 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
251
252 sk->sk_err = err;
253 sk->sk_error_report(sk);
254 out:
255 sock_put(sk);
256 }
257
258 static __inline__ void udpv6_err(struct sk_buff *skb,
259 struct inet6_skb_parm *opt, int type,
260 int code, int offset, __be32 info )
261 {
262 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
263 }
264
265 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
266 {
267 struct udp_sock *up = udp_sk(sk);
268 int rc;
269 int is_udplite = IS_UDPLITE(sk);
270
271 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
272 goto drop;
273
274 /*
275 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
276 */
277 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
278
279 if (up->pcrlen == 0) { /* full coverage was set */
280 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
281 " %d while full coverage %d requested\n",
282 UDP_SKB_CB(skb)->cscov, skb->len);
283 goto drop;
284 }
285 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
286 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
287 "too small, need min %d\n",
288 UDP_SKB_CB(skb)->cscov, up->pcrlen);
289 goto drop;
290 }
291 }
292
293 if (sk->sk_filter) {
294 if (udp_lib_checksum_complete(skb))
295 goto drop;
296 }
297
298 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
299 /* Note that an ENOMEM error is charged twice */
300 if (rc == -ENOMEM)
301 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
302 goto drop;
303 }
304
305 return 0;
306 drop:
307 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
308 kfree_skb(skb);
309 return -1;
310 }
311
312 static struct sock *udp_v6_mcast_next(struct sock *sk,
313 __be16 loc_port, struct in6_addr *loc_addr,
314 __be16 rmt_port, struct in6_addr *rmt_addr,
315 int dif)
316 {
317 struct hlist_node *node;
318 struct sock *s = sk;
319 unsigned short num = ntohs(loc_port);
320
321 sk_for_each_from(s, node) {
322 struct inet_sock *inet = inet_sk(s);
323
324 if (sock_net(s) != sock_net(sk))
325 continue;
326
327 if (s->sk_hash == num && s->sk_family == PF_INET6) {
328 struct ipv6_pinfo *np = inet6_sk(s);
329 if (inet->dport) {
330 if (inet->dport != rmt_port)
331 continue;
332 }
333 if (!ipv6_addr_any(&np->daddr) &&
334 !ipv6_addr_equal(&np->daddr, rmt_addr))
335 continue;
336
337 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
338 continue;
339
340 if (!ipv6_addr_any(&np->rcv_saddr)) {
341 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
342 continue;
343 }
344 if (!inet6_mc_check(s, loc_addr, rmt_addr))
345 continue;
346 return s;
347 }
348 }
349 return NULL;
350 }
351
352 /*
353 * Note: called only from the BH handler context,
354 * so we don't need to lock the hashes.
355 */
356 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
357 struct in6_addr *daddr, struct hlist_head udptable[])
358 {
359 struct sock *sk, *sk2;
360 const struct udphdr *uh = udp_hdr(skb);
361 int dif;
362
363 read_lock(&udp_hash_lock);
364 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
365 dif = inet6_iif(skb);
366 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
367 if (!sk) {
368 kfree_skb(skb);
369 goto out;
370 }
371
372 sk2 = sk;
373 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
374 uh->source, saddr, dif))) {
375 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
376 if (buff) {
377 bh_lock_sock_nested(sk2);
378 if (!sock_owned_by_user(sk2))
379 udpv6_queue_rcv_skb(sk2, buff);
380 else
381 sk_add_backlog(sk2, buff);
382 bh_unlock_sock(sk2);
383 }
384 }
385 bh_lock_sock_nested(sk);
386 if (!sock_owned_by_user(sk))
387 udpv6_queue_rcv_skb(sk, skb);
388 else
389 sk_add_backlog(sk, skb);
390 bh_unlock_sock(sk);
391 out:
392 read_unlock(&udp_hash_lock);
393 return 0;
394 }
395
396 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
397 int proto)
398 {
399 int err;
400
401 UDP_SKB_CB(skb)->partial_cov = 0;
402 UDP_SKB_CB(skb)->cscov = skb->len;
403
404 if (proto == IPPROTO_UDPLITE) {
405 err = udplite_checksum_init(skb, uh);
406 if (err)
407 return err;
408 }
409
410 if (uh->check == 0) {
411 /* RFC 2460 section 8.1 says that we SHOULD log
412 this error. Well, it is reasonable.
413 */
414 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
415 return 1;
416 }
417 if (skb->ip_summed == CHECKSUM_COMPLETE &&
418 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
419 skb->len, proto, skb->csum))
420 skb->ip_summed = CHECKSUM_UNNECESSARY;
421
422 if (!skb_csum_unnecessary(skb))
423 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
424 &ipv6_hdr(skb)->daddr,
425 skb->len, proto, 0));
426
427 return 0;
428 }
429
430 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
431 int proto)
432 {
433 struct sock *sk;
434 struct udphdr *uh;
435 struct net_device *dev = skb->dev;
436 struct in6_addr *saddr, *daddr;
437 u32 ulen = 0;
438
439 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
440 goto short_packet;
441
442 saddr = &ipv6_hdr(skb)->saddr;
443 daddr = &ipv6_hdr(skb)->daddr;
444 uh = udp_hdr(skb);
445
446 ulen = ntohs(uh->len);
447 if (ulen > skb->len)
448 goto short_packet;
449
450 if (proto == IPPROTO_UDP) {
451 /* UDP validates ulen. */
452
453 /* Check for jumbo payload */
454 if (ulen == 0)
455 ulen = skb->len;
456
457 if (ulen < sizeof(*uh))
458 goto short_packet;
459
460 if (ulen < skb->len) {
461 if (pskb_trim_rcsum(skb, ulen))
462 goto short_packet;
463 saddr = &ipv6_hdr(skb)->saddr;
464 daddr = &ipv6_hdr(skb)->daddr;
465 uh = udp_hdr(skb);
466 }
467 }
468
469 if (udp6_csum_init(skb, uh, proto))
470 goto discard;
471
472 /*
473 * Multicast receive code
474 */
475 if (ipv6_addr_is_multicast(daddr))
476 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
477
478 /* Unicast */
479
480 /*
481 * check socket cache ... must talk to Alan about his plans
482 * for sock caches... i'll skip this for now.
483 */
484 sk = __udp6_lib_lookup(dev_net(skb->dev), saddr, uh->source,
485 daddr, uh->dest, inet6_iif(skb), udptable);
486
487 if (sk == NULL) {
488 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
489 goto discard;
490
491 if (udp_lib_checksum_complete(skb))
492 goto discard;
493 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
494
495 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
496
497 kfree_skb(skb);
498 return 0;
499 }
500
501 /* deliver */
502
503 bh_lock_sock_nested(sk);
504 if (!sock_owned_by_user(sk))
505 udpv6_queue_rcv_skb(sk, skb);
506 else
507 sk_add_backlog(sk, skb);
508 bh_unlock_sock(sk);
509 sock_put(sk);
510 return 0;
511
512 short_packet:
513 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
514 proto == IPPROTO_UDPLITE ? "-Lite" : "",
515 ulen, skb->len);
516
517 discard:
518 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
519 kfree_skb(skb);
520 return 0;
521 }
522
523 static __inline__ int udpv6_rcv(struct sk_buff *skb)
524 {
525 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
526 }
527
528 /*
529 * Throw away all pending data and cancel the corking. Socket is locked.
530 */
531 static void udp_v6_flush_pending_frames(struct sock *sk)
532 {
533 struct udp_sock *up = udp_sk(sk);
534
535 if (up->pending == AF_INET)
536 udp_flush_pending_frames(sk);
537 else if (up->pending) {
538 up->len = 0;
539 up->pending = 0;
540 ip6_flush_pending_frames(sk);
541 }
542 }
543
544 /*
545 * Sending
546 */
547
548 static int udp_v6_push_pending_frames(struct sock *sk)
549 {
550 struct sk_buff *skb;
551 struct udphdr *uh;
552 struct udp_sock *up = udp_sk(sk);
553 struct inet_sock *inet = inet_sk(sk);
554 struct flowi *fl = &inet->cork.fl;
555 int err = 0;
556 int is_udplite = IS_UDPLITE(sk);
557 __wsum csum = 0;
558
559 /* Grab the skbuff where UDP header space exists. */
560 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
561 goto out;
562
563 /*
564 * Create a UDP header
565 */
566 uh = udp_hdr(skb);
567 uh->source = fl->fl_ip_sport;
568 uh->dest = fl->fl_ip_dport;
569 uh->len = htons(up->len);
570 uh->check = 0;
571
572 if (is_udplite)
573 csum = udplite_csum_outgoing(sk, skb);
574 else
575 csum = udp_csum_outgoing(sk, skb);
576
577 /* add protocol-dependent pseudo-header */
578 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
579 up->len, fl->proto, csum );
580 if (uh->check == 0)
581 uh->check = CSUM_MANGLED_0;
582
583 err = ip6_push_pending_frames(sk);
584 out:
585 up->len = 0;
586 up->pending = 0;
587 if (!err)
588 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
589 return err;
590 }
591
592 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
593 struct msghdr *msg, size_t len)
594 {
595 struct ipv6_txoptions opt_space;
596 struct udp_sock *up = udp_sk(sk);
597 struct inet_sock *inet = inet_sk(sk);
598 struct ipv6_pinfo *np = inet6_sk(sk);
599 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
600 struct in6_addr *daddr, *final_p = NULL, final;
601 struct ipv6_txoptions *opt = NULL;
602 struct ip6_flowlabel *flowlabel = NULL;
603 struct flowi fl;
604 struct dst_entry *dst;
605 int addr_len = msg->msg_namelen;
606 int ulen = len;
607 int hlimit = -1;
608 int tclass = -1;
609 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
610 int err;
611 int connected = 0;
612 int is_udplite = IS_UDPLITE(sk);
613 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
614
615 /* destination address check */
616 if (sin6) {
617 if (addr_len < offsetof(struct sockaddr, sa_data))
618 return -EINVAL;
619
620 switch (sin6->sin6_family) {
621 case AF_INET6:
622 if (addr_len < SIN6_LEN_RFC2133)
623 return -EINVAL;
624 daddr = &sin6->sin6_addr;
625 break;
626 case AF_INET:
627 goto do_udp_sendmsg;
628 case AF_UNSPEC:
629 msg->msg_name = sin6 = NULL;
630 msg->msg_namelen = addr_len = 0;
631 daddr = NULL;
632 break;
633 default:
634 return -EINVAL;
635 }
636 } else if (!up->pending) {
637 if (sk->sk_state != TCP_ESTABLISHED)
638 return -EDESTADDRREQ;
639 daddr = &np->daddr;
640 } else
641 daddr = NULL;
642
643 if (daddr) {
644 if (ipv6_addr_v4mapped(daddr)) {
645 struct sockaddr_in sin;
646 sin.sin_family = AF_INET;
647 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
648 sin.sin_addr.s_addr = daddr->s6_addr32[3];
649 msg->msg_name = &sin;
650 msg->msg_namelen = sizeof(sin);
651 do_udp_sendmsg:
652 if (__ipv6_only_sock(sk))
653 return -ENETUNREACH;
654 return udp_sendmsg(iocb, sk, msg, len);
655 }
656 }
657
658 if (up->pending == AF_INET)
659 return udp_sendmsg(iocb, sk, msg, len);
660
661 /* Rough check on arithmetic overflow,
662 better check is made in ip6_append_data().
663 */
664 if (len > INT_MAX - sizeof(struct udphdr))
665 return -EMSGSIZE;
666
667 if (up->pending) {
668 /*
669 * There are pending frames.
670 * The socket lock must be held while it's corked.
671 */
672 lock_sock(sk);
673 if (likely(up->pending)) {
674 if (unlikely(up->pending != AF_INET6)) {
675 release_sock(sk);
676 return -EAFNOSUPPORT;
677 }
678 dst = NULL;
679 goto do_append_data;
680 }
681 release_sock(sk);
682 }
683 ulen += sizeof(struct udphdr);
684
685 memset(&fl, 0, sizeof(fl));
686
687 if (sin6) {
688 if (sin6->sin6_port == 0)
689 return -EINVAL;
690
691 fl.fl_ip_dport = sin6->sin6_port;
692 daddr = &sin6->sin6_addr;
693
694 if (np->sndflow) {
695 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
696 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
697 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
698 if (flowlabel == NULL)
699 return -EINVAL;
700 daddr = &flowlabel->dst;
701 }
702 }
703
704 /*
705 * Otherwise it will be difficult to maintain
706 * sk->sk_dst_cache.
707 */
708 if (sk->sk_state == TCP_ESTABLISHED &&
709 ipv6_addr_equal(daddr, &np->daddr))
710 daddr = &np->daddr;
711
712 if (addr_len >= sizeof(struct sockaddr_in6) &&
713 sin6->sin6_scope_id &&
714 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
715 fl.oif = sin6->sin6_scope_id;
716 } else {
717 if (sk->sk_state != TCP_ESTABLISHED)
718 return -EDESTADDRREQ;
719
720 fl.fl_ip_dport = inet->dport;
721 daddr = &np->daddr;
722 fl.fl6_flowlabel = np->flow_label;
723 connected = 1;
724 }
725
726 if (!fl.oif)
727 fl.oif = sk->sk_bound_dev_if;
728
729 if (msg->msg_controllen) {
730 opt = &opt_space;
731 memset(opt, 0, sizeof(struct ipv6_txoptions));
732 opt->tot_len = sizeof(*opt);
733
734 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
735 if (err < 0) {
736 fl6_sock_release(flowlabel);
737 return err;
738 }
739 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
740 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
741 if (flowlabel == NULL)
742 return -EINVAL;
743 }
744 if (!(opt->opt_nflen|opt->opt_flen))
745 opt = NULL;
746 connected = 0;
747 }
748 if (opt == NULL)
749 opt = np->opt;
750 if (flowlabel)
751 opt = fl6_merge_options(&opt_space, flowlabel, opt);
752 opt = ipv6_fixup_options(&opt_space, opt);
753
754 fl.proto = sk->sk_protocol;
755 if (!ipv6_addr_any(daddr))
756 ipv6_addr_copy(&fl.fl6_dst, daddr);
757 else
758 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
759 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
760 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
761 fl.fl_ip_sport = inet->sport;
762
763 /* merge ip6_build_xmit from ip6_output */
764 if (opt && opt->srcrt) {
765 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
766 ipv6_addr_copy(&final, &fl.fl6_dst);
767 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
768 final_p = &final;
769 connected = 0;
770 }
771
772 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
773 fl.oif = np->mcast_oif;
774 connected = 0;
775 }
776
777 security_sk_classify_flow(sk, &fl);
778
779 err = ip6_sk_dst_lookup(sk, &dst, &fl);
780 if (err)
781 goto out;
782 if (final_p)
783 ipv6_addr_copy(&fl.fl6_dst, final_p);
784
785 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
786 if (err == -EREMOTE)
787 err = ip6_dst_blackhole(sk, &dst, &fl);
788 if (err < 0)
789 goto out;
790 }
791
792 if (hlimit < 0) {
793 if (ipv6_addr_is_multicast(&fl.fl6_dst))
794 hlimit = np->mcast_hops;
795 else
796 hlimit = np->hop_limit;
797 if (hlimit < 0)
798 hlimit = ip6_dst_hoplimit(dst);
799 }
800
801 if (tclass < 0) {
802 tclass = np->tclass;
803 if (tclass < 0)
804 tclass = 0;
805 }
806
807 if (msg->msg_flags&MSG_CONFIRM)
808 goto do_confirm;
809 back_from_confirm:
810
811 lock_sock(sk);
812 if (unlikely(up->pending)) {
813 /* The socket is already corked while preparing it. */
814 /* ... which is an evident application bug. --ANK */
815 release_sock(sk);
816
817 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
818 err = -EINVAL;
819 goto out;
820 }
821
822 up->pending = AF_INET6;
823
824 do_append_data:
825 up->len += ulen;
826 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
827 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
828 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
829 (struct rt6_info*)dst,
830 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
831 if (err)
832 udp_v6_flush_pending_frames(sk);
833 else if (!corkreq)
834 err = udp_v6_push_pending_frames(sk);
835 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
836 up->pending = 0;
837
838 if (dst) {
839 if (connected) {
840 ip6_dst_store(sk, dst,
841 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
842 &np->daddr : NULL,
843 #ifdef CONFIG_IPV6_SUBTREES
844 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
845 &np->saddr :
846 #endif
847 NULL);
848 } else {
849 dst_release(dst);
850 }
851 dst = NULL;
852 }
853
854 if (err > 0)
855 err = np->recverr ? net_xmit_errno(err) : 0;
856 release_sock(sk);
857 out:
858 dst_release(dst);
859 fl6_sock_release(flowlabel);
860 if (!err)
861 return len;
862 /*
863 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
864 * ENOBUFS might not be good (it's not tunable per se), but otherwise
865 * we don't have a good statistic (IpOutDiscards but it can be too many
866 * things). We could add another new stat but at least for now that
867 * seems like overkill.
868 */
869 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
870 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
871 }
872 return err;
873
874 do_confirm:
875 dst_confirm(dst);
876 if (!(msg->msg_flags&MSG_PROBE) || len)
877 goto back_from_confirm;
878 err = 0;
879 goto out;
880 }
881
882 int udpv6_destroy_sock(struct sock *sk)
883 {
884 lock_sock(sk);
885 udp_v6_flush_pending_frames(sk);
886 release_sock(sk);
887
888 inet6_destroy_sock(sk);
889
890 return 0;
891 }
892
893 /*
894 * Socket option code for UDP
895 */
896 int udpv6_setsockopt(struct sock *sk, int level, int optname,
897 char __user *optval, int optlen)
898 {
899 if (level == SOL_UDP || level == SOL_UDPLITE)
900 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
901 udp_v6_push_pending_frames);
902 return ipv6_setsockopt(sk, level, optname, optval, optlen);
903 }
904
905 #ifdef CONFIG_COMPAT
906 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
907 char __user *optval, int optlen)
908 {
909 if (level == SOL_UDP || level == SOL_UDPLITE)
910 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
911 udp_v6_push_pending_frames);
912 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
913 }
914 #endif
915
916 int udpv6_getsockopt(struct sock *sk, int level, int optname,
917 char __user *optval, int __user *optlen)
918 {
919 if (level == SOL_UDP || level == SOL_UDPLITE)
920 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
921 return ipv6_getsockopt(sk, level, optname, optval, optlen);
922 }
923
924 #ifdef CONFIG_COMPAT
925 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
926 char __user *optval, int __user *optlen)
927 {
928 if (level == SOL_UDP || level == SOL_UDPLITE)
929 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
930 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
931 }
932 #endif
933
934 static struct inet6_protocol udpv6_protocol = {
935 .handler = udpv6_rcv,
936 .err_handler = udpv6_err,
937 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
938 };
939
940 /* ------------------------------------------------------------------------ */
941 #ifdef CONFIG_PROC_FS
942
943 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
944 {
945 struct inet_sock *inet = inet_sk(sp);
946 struct ipv6_pinfo *np = inet6_sk(sp);
947 struct in6_addr *dest, *src;
948 __u16 destp, srcp;
949
950 dest = &np->daddr;
951 src = &np->rcv_saddr;
952 destp = ntohs(inet->dport);
953 srcp = ntohs(inet->sport);
954 seq_printf(seq,
955 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
956 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
957 bucket,
958 src->s6_addr32[0], src->s6_addr32[1],
959 src->s6_addr32[2], src->s6_addr32[3], srcp,
960 dest->s6_addr32[0], dest->s6_addr32[1],
961 dest->s6_addr32[2], dest->s6_addr32[3], destp,
962 sp->sk_state,
963 atomic_read(&sp->sk_wmem_alloc),
964 atomic_read(&sp->sk_rmem_alloc),
965 0, 0L, 0,
966 sock_i_uid(sp), 0,
967 sock_i_ino(sp),
968 atomic_read(&sp->sk_refcnt), sp);
969 }
970
971 int udp6_seq_show(struct seq_file *seq, void *v)
972 {
973 if (v == SEQ_START_TOKEN)
974 seq_printf(seq,
975 " sl "
976 "local_address "
977 "remote_address "
978 "st tx_queue rx_queue tr tm->when retrnsmt"
979 " uid timeout inode\n");
980 else
981 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
982 return 0;
983 }
984
985 static struct udp_seq_afinfo udp6_seq_afinfo = {
986 .name = "udp6",
987 .family = AF_INET6,
988 .hashtable = udp_hash,
989 .seq_fops = {
990 .owner = THIS_MODULE,
991 },
992 .seq_ops = {
993 .show = udp6_seq_show,
994 },
995 };
996
997 int udp6_proc_init(struct net *net)
998 {
999 return udp_proc_register(net, &udp6_seq_afinfo);
1000 }
1001
1002 void udp6_proc_exit(struct net *net) {
1003 udp_proc_unregister(net, &udp6_seq_afinfo);
1004 }
1005 #endif /* CONFIG_PROC_FS */
1006
1007 /* ------------------------------------------------------------------------ */
1008
1009 struct proto udpv6_prot = {
1010 .name = "UDPv6",
1011 .owner = THIS_MODULE,
1012 .close = udp_lib_close,
1013 .connect = ip6_datagram_connect,
1014 .disconnect = udp_disconnect,
1015 .ioctl = udp_ioctl,
1016 .destroy = udpv6_destroy_sock,
1017 .setsockopt = udpv6_setsockopt,
1018 .getsockopt = udpv6_getsockopt,
1019 .sendmsg = udpv6_sendmsg,
1020 .recvmsg = udpv6_recvmsg,
1021 .backlog_rcv = udpv6_queue_rcv_skb,
1022 .hash = udp_lib_hash,
1023 .unhash = udp_lib_unhash,
1024 .get_port = udp_v6_get_port,
1025 .memory_allocated = &udp_memory_allocated,
1026 .sysctl_mem = sysctl_udp_mem,
1027 .sysctl_wmem = &sysctl_udp_wmem_min,
1028 .sysctl_rmem = &sysctl_udp_rmem_min,
1029 .obj_size = sizeof(struct udp6_sock),
1030 .h.udp_hash = udp_hash,
1031 #ifdef CONFIG_COMPAT
1032 .compat_setsockopt = compat_udpv6_setsockopt,
1033 .compat_getsockopt = compat_udpv6_getsockopt,
1034 #endif
1035 };
1036
1037 static struct inet_protosw udpv6_protosw = {
1038 .type = SOCK_DGRAM,
1039 .protocol = IPPROTO_UDP,
1040 .prot = &udpv6_prot,
1041 .ops = &inet6_dgram_ops,
1042 .capability =-1,
1043 .no_check = UDP_CSUM_DEFAULT,
1044 .flags = INET_PROTOSW_PERMANENT,
1045 };
1046
1047
1048 int __init udpv6_init(void)
1049 {
1050 int ret;
1051
1052 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1053 if (ret)
1054 goto out;
1055
1056 ret = inet6_register_protosw(&udpv6_protosw);
1057 if (ret)
1058 goto out_udpv6_protocol;
1059 out:
1060 return ret;
1061
1062 out_udpv6_protocol:
1063 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1064 goto out;
1065 }
1066
1067 void udpv6_exit(void)
1068 {
1069 inet6_unregister_protosw(&udpv6_protosw);
1070 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1071 }
Linux kernel - Deliverables
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