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Linux 2.6.22-rc3
[linux-2.6/next.git] / net / ipv6 / udp.c
blobd1fbddd172e76c277625254641e59ae884488f0a
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 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
11 *
12 * Fixes:
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
15 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
16 * a single port at the same time.
17 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/sockios.h>
30 #include <linux/net.h>
31 #include <linux/in6.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/ipv6.h>
35 #include <linux/icmpv6.h>
36 #include <linux/init.h>
37 #include <linux/skbuff.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include "udp_impl.h"
52
53 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
54
55 static int ipv6_rcv_saddr_any(const struct sock *sk)
56 {
57 struct ipv6_pinfo *np = inet6_sk(sk);
58
59 return ipv6_addr_any(&np->rcv_saddr);
60 }
61
62 static unsigned int ipv6_hash_port_and_rcv_saddr(__u16 port,
63 const struct sock *sk)
64 {
65 return port;
66 }
67
68 const struct udp_get_port_ops udp_ipv6_ops = {
69 .saddr_cmp = ipv6_rcv_saddr_equal,
70 .saddr_any = ipv6_rcv_saddr_any,
71 .hash_port_and_rcv_saddr = ipv6_hash_port_and_rcv_saddr,
72 };
73
74 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
75 {
76 return udp_get_port(sk, snum, &udp_ipv6_ops);
77 }
78
79 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
80 struct in6_addr *daddr, __be16 dport,
81 int dif, struct hlist_head udptable[])
82 {
83 struct sock *sk, *result = NULL;
84 struct hlist_node *node;
85 unsigned short hnum = ntohs(dport);
86 int badness = -1;
87
88 read_lock(&udp_hash_lock);
89 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
90 struct inet_sock *inet = inet_sk(sk);
91
92 if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
93 struct ipv6_pinfo *np = inet6_sk(sk);
94 int score = 0;
95 if (inet->dport) {
96 if (inet->dport != sport)
97 continue;
98 score++;
99 }
100 if (!ipv6_addr_any(&np->rcv_saddr)) {
101 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
102 continue;
103 score++;
104 }
105 if (!ipv6_addr_any(&np->daddr)) {
106 if (!ipv6_addr_equal(&np->daddr, saddr))
107 continue;
108 score++;
109 }
110 if (sk->sk_bound_dev_if) {
111 if (sk->sk_bound_dev_if != dif)
112 continue;
113 score++;
114 }
115 if (score == 4) {
116 result = sk;
117 break;
118 } else if (score > badness) {
119 result = sk;
120 badness = score;
121 }
122 }
123 }
124 if (result)
125 sock_hold(result);
126 read_unlock(&udp_hash_lock);
127 return result;
128 }
129
130 /*
131 * This should be easy, if there is something there we
132 * return it, otherwise we block.
133 */
134
135 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
136 struct msghdr *msg, size_t len,
137 int noblock, int flags, int *addr_len)
138 {
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct inet_sock *inet = inet_sk(sk);
141 struct sk_buff *skb;
142 unsigned int ulen, copied;
143 int err;
144 int is_udplite = IS_UDPLITE(sk);
145
146 if (addr_len)
147 *addr_len=sizeof(struct sockaddr_in6);
148
149 if (flags & MSG_ERRQUEUE)
150 return ipv6_recv_error(sk, msg, len);
151
152 try_again:
153 skb = skb_recv_datagram(sk, flags, noblock, &err);
154 if (!skb)
155 goto out;
156
157 ulen = skb->len - sizeof(struct udphdr);
158 copied = len;
159 if (copied > ulen)
160 copied = ulen;
161 else if (copied < ulen)
162 msg->msg_flags |= MSG_TRUNC;
163
164 /*
165 * If checksum is needed at all, try to do it while copying the
166 * data. If the data is truncated, or if we only want a partial
167 * coverage checksum (UDP-Lite), do it before the copy.
168 */
169
170 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
171 if (udp_lib_checksum_complete(skb))
172 goto csum_copy_err;
173 }
174
175 if (skb_csum_unnecessary(skb))
176 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
177 msg->msg_iov, copied );
178 else {
179 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
180 if (err == -EINVAL)
181 goto csum_copy_err;
182 }
183 if (err)
184 goto out_free;
185
186 sock_recv_timestamp(msg, sk, skb);
187
188 /* Copy the address. */
189 if (msg->msg_name) {
190 struct sockaddr_in6 *sin6;
191
192 sin6 = (struct sockaddr_in6 *) msg->msg_name;
193 sin6->sin6_family = AF_INET6;
194 sin6->sin6_port = udp_hdr(skb)->source;
195 sin6->sin6_flowinfo = 0;
196 sin6->sin6_scope_id = 0;
197
198 if (skb->protocol == htons(ETH_P_IP))
199 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
200 htonl(0xffff), ip_hdr(skb)->saddr);
201 else {
202 ipv6_addr_copy(&sin6->sin6_addr,
203 &ipv6_hdr(skb)->saddr);
204 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
205 sin6->sin6_scope_id = IP6CB(skb)->iif;
206 }
207
208 }
209 if (skb->protocol == htons(ETH_P_IP)) {
210 if (inet->cmsg_flags)
211 ip_cmsg_recv(msg, skb);
212 } else {
213 if (np->rxopt.all)
214 datagram_recv_ctl(sk, msg, skb);
215 }
216
217 err = copied;
218 if (flags & MSG_TRUNC)
219 err = ulen;
220
221 out_free:
222 skb_free_datagram(sk, skb);
223 out:
224 return err;
225
226 csum_copy_err:
227 skb_kill_datagram(sk, skb, flags);
228
229 if (flags & MSG_DONTWAIT) {
230 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
231 return -EAGAIN;
232 }
233 goto try_again;
234 }
235
236 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
237 int type, int code, int offset, __be32 info,
238 struct hlist_head udptable[] )
239 {
240 struct ipv6_pinfo *np;
241 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
242 struct in6_addr *saddr = &hdr->saddr;
243 struct in6_addr *daddr = &hdr->daddr;
244 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
245 struct sock *sk;
246 int err;
247
248 sk = __udp6_lib_lookup(daddr, uh->dest,
249 saddr, uh->source, inet6_iif(skb), udptable);
250 if (sk == NULL)
251 return;
252
253 np = inet6_sk(sk);
254
255 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
256 goto out;
257
258 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
259 goto out;
260
261 if (np->recverr)
262 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
263
264 sk->sk_err = err;
265 sk->sk_error_report(sk);
266 out:
267 sock_put(sk);
268 }
269
270 static __inline__ void udpv6_err(struct sk_buff *skb,
271 struct inet6_skb_parm *opt, int type,
272 int code, int offset, __be32 info )
273 {
274 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
275 }
276
277 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
278 {
279 struct udp_sock *up = udp_sk(sk);
280 int rc;
281
282 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
283 goto drop;
284
285 /*
286 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
287 */
288 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
289
290 if (up->pcrlen == 0) { /* full coverage was set */
291 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
292 " %d while full coverage %d requested\n",
293 UDP_SKB_CB(skb)->cscov, skb->len);
294 goto drop;
295 }
296 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
297 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
298 "too small, need min %d\n",
299 UDP_SKB_CB(skb)->cscov, up->pcrlen);
300 goto drop;
301 }
302 }
303
304 if (sk->sk_filter) {
305 if (udp_lib_checksum_complete(skb))
306 goto drop;
307 }
308
309 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
310 /* Note that an ENOMEM error is charged twice */
311 if (rc == -ENOMEM)
312 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
313 goto drop;
314 }
315 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
316 return 0;
317 drop:
318 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
319 kfree_skb(skb);
320 return -1;
321 }
322
323 static struct sock *udp_v6_mcast_next(struct sock *sk,
324 __be16 loc_port, struct in6_addr *loc_addr,
325 __be16 rmt_port, struct in6_addr *rmt_addr,
326 int dif)
327 {
328 struct hlist_node *node;
329 struct sock *s = sk;
330 unsigned short num = ntohs(loc_port);
331
332 sk_for_each_from(s, node) {
333 struct inet_sock *inet = inet_sk(s);
334
335 if (s->sk_hash == num && s->sk_family == PF_INET6) {
336 struct ipv6_pinfo *np = inet6_sk(s);
337 if (inet->dport) {
338 if (inet->dport != rmt_port)
339 continue;
340 }
341 if (!ipv6_addr_any(&np->daddr) &&
342 !ipv6_addr_equal(&np->daddr, rmt_addr))
343 continue;
344
345 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
346 continue;
347
348 if (!ipv6_addr_any(&np->rcv_saddr)) {
349 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
350 continue;
351 }
352 if (!inet6_mc_check(s, loc_addr, rmt_addr))
353 continue;
354 return s;
355 }
356 }
357 return NULL;
358 }
359
360 /*
361 * Note: called only from the BH handler context,
362 * so we don't need to lock the hashes.
363 */
364 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
365 struct in6_addr *daddr, struct hlist_head udptable[])
366 {
367 struct sock *sk, *sk2;
368 const struct udphdr *uh = udp_hdr(skb);
369 int dif;
370
371 read_lock(&udp_hash_lock);
372 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
373 dif = inet6_iif(skb);
374 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
375 if (!sk) {
376 kfree_skb(skb);
377 goto out;
378 }
379
380 sk2 = sk;
381 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
382 uh->source, saddr, dif))) {
383 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
384 if (buff)
385 udpv6_queue_rcv_skb(sk2, buff);
386 }
387 udpv6_queue_rcv_skb(sk, skb);
388 out:
389 read_unlock(&udp_hash_lock);
390 return 0;
391 }
392
393 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
394 int proto)
395 {
396 int err;
397
398 UDP_SKB_CB(skb)->partial_cov = 0;
399 UDP_SKB_CB(skb)->cscov = skb->len;
400
401 if (proto == IPPROTO_UDPLITE) {
402 err = udplite_checksum_init(skb, uh);
403 if (err)
404 return err;
405 }
406
407 if (uh->check == 0) {
408 /* RFC 2460 section 8.1 says that we SHOULD log
409 this error. Well, it is reasonable.
410 */
411 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
412 return 1;
413 }
414 if (skb->ip_summed == CHECKSUM_COMPLETE &&
415 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
416 skb->len, proto, skb->csum))
417 skb->ip_summed = CHECKSUM_UNNECESSARY;
418
419 if (!skb_csum_unnecessary(skb))
420 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
421 &ipv6_hdr(skb)->daddr,
422 skb->len, proto, 0));
423
424 return 0;
425 }
426
427 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
428 int proto)
429 {
430 struct sk_buff *skb = *pskb;
431 struct sock *sk;
432 struct udphdr *uh;
433 struct net_device *dev = skb->dev;
434 struct in6_addr *saddr, *daddr;
435 u32 ulen = 0;
436
437 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
438 goto short_packet;
439
440 saddr = &ipv6_hdr(skb)->saddr;
441 daddr = &ipv6_hdr(skb)->daddr;
442 uh = udp_hdr(skb);
443
444 ulen = ntohs(uh->len);
445 if (ulen > skb->len)
446 goto short_packet;
447
448 if (proto == IPPROTO_UDP) {
449 /* UDP validates ulen. */
450
451 /* Check for jumbo payload */
452 if (ulen == 0)
453 ulen = skb->len;
454
455 if (ulen < sizeof(*uh))
456 goto short_packet;
457
458 if (ulen < skb->len) {
459 if (pskb_trim_rcsum(skb, ulen))
460 goto short_packet;
461 saddr = &ipv6_hdr(skb)->saddr;
462 daddr = &ipv6_hdr(skb)->daddr;
463 uh = udp_hdr(skb);
464 }
465 }
466
467 if (udp6_csum_init(skb, uh, proto))
468 goto discard;
469
470 /*
471 * Multicast receive code
472 */
473 if (ipv6_addr_is_multicast(daddr))
474 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
475
476 /* Unicast */
477
478 /*
479 * check socket cache ... must talk to Alan about his plans
480 * for sock caches... i'll skip this for now.
481 */
482 sk = __udp6_lib_lookup(saddr, uh->source,
483 daddr, uh->dest, inet6_iif(skb), udptable);
484
485 if (sk == NULL) {
486 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
487 goto discard;
488
489 if (udp_lib_checksum_complete(skb))
490 goto discard;
491 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
492
493 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
494
495 kfree_skb(skb);
496 return 0;
497 }
498
499 /* deliver */
500
501 udpv6_queue_rcv_skb(sk, skb);
502 sock_put(sk);
503 return 0;
504
505 short_packet:
506 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
507 proto == IPPROTO_UDPLITE ? "-Lite" : "",
508 ulen, skb->len);
509
510 discard:
511 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
512 kfree_skb(skb);
513 return 0;
514 }
515
516 static __inline__ int udpv6_rcv(struct sk_buff **pskb)
517 {
518 return __udp6_lib_rcv(pskb, udp_hash, IPPROTO_UDP);
519 }
520
521 /*
522 * Throw away all pending data and cancel the corking. Socket is locked.
523 */
524 static void udp_v6_flush_pending_frames(struct sock *sk)
525 {
526 struct udp_sock *up = udp_sk(sk);
527
528 if (up->pending) {
529 up->len = 0;
530 up->pending = 0;
531 ip6_flush_pending_frames(sk);
532 }
533 }
534
535 /*
536 * Sending
537 */
538
539 static int udp_v6_push_pending_frames(struct sock *sk)
540 {
541 struct sk_buff *skb;
542 struct udphdr *uh;
543 struct udp_sock *up = udp_sk(sk);
544 struct inet_sock *inet = inet_sk(sk);
545 struct flowi *fl = &inet->cork.fl;
546 int err = 0;
547 __wsum csum = 0;
548
549 /* Grab the skbuff where UDP header space exists. */
550 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
551 goto out;
552
553 /*
554 * Create a UDP header
555 */
556 uh = udp_hdr(skb);
557 uh->source = fl->fl_ip_sport;
558 uh->dest = fl->fl_ip_dport;
559 uh->len = htons(up->len);
560 uh->check = 0;
561
562 if (up->pcflag)
563 csum = udplite_csum_outgoing(sk, skb);
564 else
565 csum = udp_csum_outgoing(sk, skb);
566
567 /* add protocol-dependent pseudo-header */
568 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
569 up->len, fl->proto, csum );
570 if (uh->check == 0)
571 uh->check = CSUM_MANGLED_0;
572
573 err = ip6_push_pending_frames(sk);
574 out:
575 up->len = 0;
576 up->pending = 0;
577 return err;
578 }
579
580 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
581 struct msghdr *msg, size_t len)
582 {
583 struct ipv6_txoptions opt_space;
584 struct udp_sock *up = udp_sk(sk);
585 struct inet_sock *inet = inet_sk(sk);
586 struct ipv6_pinfo *np = inet6_sk(sk);
587 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
588 struct in6_addr *daddr, *final_p = NULL, final;
589 struct ipv6_txoptions *opt = NULL;
590 struct ip6_flowlabel *flowlabel = NULL;
591 struct flowi fl;
592 struct dst_entry *dst;
593 int addr_len = msg->msg_namelen;
594 int ulen = len;
595 int hlimit = -1;
596 int tclass = -1;
597 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
598 int err;
599 int connected = 0;
600 int is_udplite = up->pcflag;
601 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
602
603 /* destination address check */
604 if (sin6) {
605 if (addr_len < offsetof(struct sockaddr, sa_data))
606 return -EINVAL;
607
608 switch (sin6->sin6_family) {
609 case AF_INET6:
610 if (addr_len < SIN6_LEN_RFC2133)
611 return -EINVAL;
612 daddr = &sin6->sin6_addr;
613 break;
614 case AF_INET:
615 goto do_udp_sendmsg;
616 case AF_UNSPEC:
617 msg->msg_name = sin6 = NULL;
618 msg->msg_namelen = addr_len = 0;
619 daddr = NULL;
620 break;
621 default:
622 return -EINVAL;
623 }
624 } else if (!up->pending) {
625 if (sk->sk_state != TCP_ESTABLISHED)
626 return -EDESTADDRREQ;
627 daddr = &np->daddr;
628 } else
629 daddr = NULL;
630
631 if (daddr) {
632 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
633 struct sockaddr_in sin;
634 sin.sin_family = AF_INET;
635 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
636 sin.sin_addr.s_addr = daddr->s6_addr32[3];
637 msg->msg_name = &sin;
638 msg->msg_namelen = sizeof(sin);
639 do_udp_sendmsg:
640 if (__ipv6_only_sock(sk))
641 return -ENETUNREACH;
642 return udp_sendmsg(iocb, sk, msg, len);
643 }
644 }
645
646 if (up->pending == AF_INET)
647 return udp_sendmsg(iocb, sk, msg, len);
648
649 /* Rough check on arithmetic overflow,
650 better check is made in ip6_append_data().
651 */
652 if (len > INT_MAX - sizeof(struct udphdr))
653 return -EMSGSIZE;
654
655 if (up->pending) {
656 /*
657 * There are pending frames.
658 * The socket lock must be held while it's corked.
659 */
660 lock_sock(sk);
661 if (likely(up->pending)) {
662 if (unlikely(up->pending != AF_INET6)) {
663 release_sock(sk);
664 return -EAFNOSUPPORT;
665 }
666 dst = NULL;
667 goto do_append_data;
668 }
669 release_sock(sk);
670 }
671 ulen += sizeof(struct udphdr);
672
673 memset(&fl, 0, sizeof(fl));
674
675 if (sin6) {
676 if (sin6->sin6_port == 0)
677 return -EINVAL;
678
679 fl.fl_ip_dport = sin6->sin6_port;
680 daddr = &sin6->sin6_addr;
681
682 if (np->sndflow) {
683 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
684 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
685 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
686 if (flowlabel == NULL)
687 return -EINVAL;
688 daddr = &flowlabel->dst;
689 }
690 }
691
692 /*
693 * Otherwise it will be difficult to maintain
694 * sk->sk_dst_cache.
695 */
696 if (sk->sk_state == TCP_ESTABLISHED &&
697 ipv6_addr_equal(daddr, &np->daddr))
698 daddr = &np->daddr;
699
700 if (addr_len >= sizeof(struct sockaddr_in6) &&
701 sin6->sin6_scope_id &&
702 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
703 fl.oif = sin6->sin6_scope_id;
704 } else {
705 if (sk->sk_state != TCP_ESTABLISHED)
706 return -EDESTADDRREQ;
707
708 fl.fl_ip_dport = inet->dport;
709 daddr = &np->daddr;
710 fl.fl6_flowlabel = np->flow_label;
711 connected = 1;
712 }
713
714 if (!fl.oif)
715 fl.oif = sk->sk_bound_dev_if;
716
717 if (msg->msg_controllen) {
718 opt = &opt_space;
719 memset(opt, 0, sizeof(struct ipv6_txoptions));
720 opt->tot_len = sizeof(*opt);
721
722 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
723 if (err < 0) {
724 fl6_sock_release(flowlabel);
725 return err;
726 }
727 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
728 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
729 if (flowlabel == NULL)
730 return -EINVAL;
731 }
732 if (!(opt->opt_nflen|opt->opt_flen))
733 opt = NULL;
734 connected = 0;
735 }
736 if (opt == NULL)
737 opt = np->opt;
738 if (flowlabel)
739 opt = fl6_merge_options(&opt_space, flowlabel, opt);
740 opt = ipv6_fixup_options(&opt_space, opt);
741
742 fl.proto = sk->sk_protocol;
743 ipv6_addr_copy(&fl.fl6_dst, daddr);
744 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
745 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
746 fl.fl_ip_sport = inet->sport;
747
748 /* merge ip6_build_xmit from ip6_output */
749 if (opt && opt->srcrt) {
750 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
751 ipv6_addr_copy(&final, &fl.fl6_dst);
752 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
753 final_p = &final;
754 connected = 0;
755 }
756
757 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
758 fl.oif = np->mcast_oif;
759 connected = 0;
760 }
761
762 security_sk_classify_flow(sk, &fl);
763
764 err = ip6_sk_dst_lookup(sk, &dst, &fl);
765 if (err)
766 goto out;
767 if (final_p)
768 ipv6_addr_copy(&fl.fl6_dst, final_p);
769
770 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
771 if (err == -EREMOTE)
772 err = ip6_dst_blackhole(sk, &dst, &fl);
773 if (err < 0)
774 goto out;
775 }
776
777 if (hlimit < 0) {
778 if (ipv6_addr_is_multicast(&fl.fl6_dst))
779 hlimit = np->mcast_hops;
780 else
781 hlimit = np->hop_limit;
782 if (hlimit < 0)
783 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
784 if (hlimit < 0)
785 hlimit = ipv6_get_hoplimit(dst->dev);
786 }
787
788 if (tclass < 0) {
789 tclass = np->tclass;
790 if (tclass < 0)
791 tclass = 0;
792 }
793
794 if (msg->msg_flags&MSG_CONFIRM)
795 goto do_confirm;
796 back_from_confirm:
797
798 lock_sock(sk);
799 if (unlikely(up->pending)) {
800 /* The socket is already corked while preparing it. */
801 /* ... which is an evident application bug. --ANK */
802 release_sock(sk);
803
804 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
805 err = -EINVAL;
806 goto out;
807 }
808
809 up->pending = AF_INET6;
810
811 do_append_data:
812 up->len += ulen;
813 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
814 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
815 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
816 (struct rt6_info*)dst,
817 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
818 if (err)
819 udp_v6_flush_pending_frames(sk);
820 else if (!corkreq)
821 err = udp_v6_push_pending_frames(sk);
822 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
823 up->pending = 0;
824
825 if (dst) {
826 if (connected) {
827 ip6_dst_store(sk, dst,
828 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
829 &np->daddr : NULL,
830 #ifdef CONFIG_IPV6_SUBTREES
831 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
832 &np->saddr :
833 #endif
834 NULL);
835 } else {
836 dst_release(dst);
837 }
838 }
839
840 if (err > 0)
841 err = np->recverr ? net_xmit_errno(err) : 0;
842 release_sock(sk);
843 out:
844 fl6_sock_release(flowlabel);
845 if (!err) {
846 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
847 return len;
848 }
849 /*
850 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
851 * ENOBUFS might not be good (it's not tunable per se), but otherwise
852 * we don't have a good statistic (IpOutDiscards but it can be too many
853 * things). We could add another new stat but at least for now that
854 * seems like overkill.
855 */
856 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
857 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
858 }
859 return err;
860
861 do_confirm:
862 dst_confirm(dst);
863 if (!(msg->msg_flags&MSG_PROBE) || len)
864 goto back_from_confirm;
865 err = 0;
866 goto out;
867 }
868
869 int udpv6_destroy_sock(struct sock *sk)
870 {
871 lock_sock(sk);
872 udp_v6_flush_pending_frames(sk);
873 release_sock(sk);
874
875 inet6_destroy_sock(sk);
876
877 return 0;
878 }
879
880 /*
881 * Socket option code for UDP
882 */
883 int udpv6_setsockopt(struct sock *sk, int level, int optname,
884 char __user *optval, int optlen)
885 {
886 if (level == SOL_UDP || level == SOL_UDPLITE)
887 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
888 udp_v6_push_pending_frames);
889 return ipv6_setsockopt(sk, level, optname, optval, optlen);
890 }
891
892 #ifdef CONFIG_COMPAT
893 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
894 char __user *optval, int optlen)
895 {
896 if (level == SOL_UDP || level == SOL_UDPLITE)
897 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
898 udp_v6_push_pending_frames);
899 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
900 }
901 #endif
902
903 int udpv6_getsockopt(struct sock *sk, int level, int optname,
904 char __user *optval, int __user *optlen)
905 {
906 if (level == SOL_UDP || level == SOL_UDPLITE)
907 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
908 return ipv6_getsockopt(sk, level, optname, optval, optlen);
909 }
910
911 #ifdef CONFIG_COMPAT
912 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
913 char __user *optval, int __user *optlen)
914 {
915 if (level == SOL_UDP || level == SOL_UDPLITE)
916 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
917 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
918 }
919 #endif
920
921 static struct inet6_protocol udpv6_protocol = {
922 .handler = udpv6_rcv,
923 .err_handler = udpv6_err,
924 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
925 };
926
927 /* ------------------------------------------------------------------------ */
928 #ifdef CONFIG_PROC_FS
929
930 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
931 {
932 struct inet_sock *inet = inet_sk(sp);
933 struct ipv6_pinfo *np = inet6_sk(sp);
934 struct in6_addr *dest, *src;
935 __u16 destp, srcp;
936
937 dest = &np->daddr;
938 src = &np->rcv_saddr;
939 destp = ntohs(inet->dport);
940 srcp = ntohs(inet->sport);
941 seq_printf(seq,
942 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
943 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
944 bucket,
945 src->s6_addr32[0], src->s6_addr32[1],
946 src->s6_addr32[2], src->s6_addr32[3], srcp,
947 dest->s6_addr32[0], dest->s6_addr32[1],
948 dest->s6_addr32[2], dest->s6_addr32[3], destp,
949 sp->sk_state,
950 atomic_read(&sp->sk_wmem_alloc),
951 atomic_read(&sp->sk_rmem_alloc),
952 0, 0L, 0,
953 sock_i_uid(sp), 0,
954 sock_i_ino(sp),
955 atomic_read(&sp->sk_refcnt), sp);
956 }
957
958 int udp6_seq_show(struct seq_file *seq, void *v)
959 {
960 if (v == SEQ_START_TOKEN)
961 seq_printf(seq,
962 " sl "
963 "local_address "
964 "remote_address "
965 "st tx_queue rx_queue tr tm->when retrnsmt"
966 " uid timeout inode\n");
967 else
968 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
969 return 0;
970 }
971
972 static struct file_operations udp6_seq_fops;
973 static struct udp_seq_afinfo udp6_seq_afinfo = {
974 .owner = THIS_MODULE,
975 .name = "udp6",
976 .family = AF_INET6,
977 .hashtable = udp_hash,
978 .seq_show = udp6_seq_show,
979 .seq_fops = &udp6_seq_fops,
980 };
981
982 int __init udp6_proc_init(void)
983 {
984 return udp_proc_register(&udp6_seq_afinfo);
985 }
986
987 void udp6_proc_exit(void) {
988 udp_proc_unregister(&udp6_seq_afinfo);
989 }
990 #endif /* CONFIG_PROC_FS */
991
992 /* ------------------------------------------------------------------------ */
993
994 struct proto udpv6_prot = {
995 .name = "UDPv6",
996 .owner = THIS_MODULE,
997 .close = udp_lib_close,
998 .connect = ip6_datagram_connect,
999 .disconnect = udp_disconnect,
1000 .ioctl = udp_ioctl,
1001 .destroy = udpv6_destroy_sock,
1002 .setsockopt = udpv6_setsockopt,
1003 .getsockopt = udpv6_getsockopt,
1004 .sendmsg = udpv6_sendmsg,
1005 .recvmsg = udpv6_recvmsg,
1006 .backlog_rcv = udpv6_queue_rcv_skb,
1007 .hash = udp_lib_hash,
1008 .unhash = udp_lib_unhash,
1009 .get_port = udp_v6_get_port,
1010 .obj_size = sizeof(struct udp6_sock),
1011 #ifdef CONFIG_COMPAT
1012 .compat_setsockopt = compat_udpv6_setsockopt,
1013 .compat_getsockopt = compat_udpv6_getsockopt,
1014 #endif
1015 };
1016
1017 static struct inet_protosw udpv6_protosw = {
1018 .type = SOCK_DGRAM,
1019 .protocol = IPPROTO_UDP,
1020 .prot = &udpv6_prot,
1021 .ops = &inet6_dgram_ops,
1022 .capability =-1,
1023 .no_check = UDP_CSUM_DEFAULT,
1024 .flags = INET_PROTOSW_PERMANENT,
1025 };
1026
1027
1028 void __init udpv6_init(void)
1029 {
1030 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1031 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1032 inet6_register_protosw(&udpv6_protosw);
1033 }
linux-next