?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ext4: really print the find_group_flex fallback warning only once
[linux-2.6/linux-2.6-openrd.git] / net / ipv6 / udp.c
blob6842dd2edd5bc0a9552c4bfbd2f7b9fbed7480fe
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 ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
53 {
54 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
55 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
56 int sk_ipv6only = ipv6_only_sock(sk);
57 int sk2_ipv6only = inet_v6_ipv6only(sk2);
58 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
59 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
60
61 /* if both are mapped, treat as IPv4 */
62 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
63 return ipv4_rcv_saddr_equal(sk, sk2);
64
65 if (addr_type2 == IPV6_ADDR_ANY &&
66 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
67 return 1;
68
69 if (addr_type == IPV6_ADDR_ANY &&
70 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
71 return 1;
72
73 if (sk2_rcv_saddr6 &&
74 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
75 return 1;
76
77 return 0;
78 }
79
80 int udp_v6_get_port(struct sock *sk, unsigned short snum)
81 {
82 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
83 }
84
85 static inline int compute_score(struct sock *sk, struct net *net,
86 unsigned short hnum,
87 struct in6_addr *saddr, __be16 sport,
88 struct in6_addr *daddr, __be16 dport,
89 int dif)
90 {
91 int score = -1;
92
93 if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
94 sk->sk_family == PF_INET6) {
95 struct ipv6_pinfo *np = inet6_sk(sk);
96 struct inet_sock *inet = inet_sk(sk);
97
98 score = 0;
99 if (inet->dport) {
100 if (inet->dport != sport)
101 return -1;
102 score++;
103 }
104 if (!ipv6_addr_any(&np->rcv_saddr)) {
105 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
106 return -1;
107 score++;
108 }
109 if (!ipv6_addr_any(&np->daddr)) {
110 if (!ipv6_addr_equal(&np->daddr, saddr))
111 return -1;
112 score++;
113 }
114 if (sk->sk_bound_dev_if) {
115 if (sk->sk_bound_dev_if != dif)
116 return -1;
117 score++;
118 }
119 }
120 return score;
121 }
122
123 static struct sock *__udp6_lib_lookup(struct net *net,
124 struct in6_addr *saddr, __be16 sport,
125 struct in6_addr *daddr, __be16 dport,
126 int dif, struct udp_table *udptable)
127 {
128 struct sock *sk, *result;
129 struct hlist_nulls_node *node;
130 unsigned short hnum = ntohs(dport);
131 unsigned int hash = udp_hashfn(net, hnum);
132 struct udp_hslot *hslot = &udptable->hash[hash];
133 int score, badness;
134
135 rcu_read_lock();
136 begin:
137 result = NULL;
138 badness = -1;
139 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
140 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
141 if (score > badness) {
142 result = sk;
143 badness = score;
144 }
145 }
146 /*
147 * if the nulls value we got at the end of this lookup is
148 * not the expected one, we must restart lookup.
149 * We probably met an item that was moved to another chain.
150 */
151 if (get_nulls_value(node) != hash)
152 goto begin;
153
154 if (result) {
155 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
156 result = NULL;
157 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
158 daddr, dport, dif) < badness)) {
159 sock_put(result);
160 goto begin;
161 }
162 }
163 rcu_read_unlock();
164 return result;
165 }
166
167 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
168 __be16 sport, __be16 dport,
169 struct udp_table *udptable)
170 {
171 struct sock *sk;
172 struct ipv6hdr *iph = ipv6_hdr(skb);
173
174 if (unlikely(sk = skb_steal_sock(skb)))
175 return sk;
176 else
177 return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
178 &iph->daddr, dport, inet6_iif(skb),
179 udptable);
180 }
181
182 /*
183 * This should be easy, if there is something there we
184 * return it, otherwise we block.
185 */
186
187 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
188 struct msghdr *msg, size_t len,
189 int noblock, int flags, int *addr_len)
190 {
191 struct ipv6_pinfo *np = inet6_sk(sk);
192 struct inet_sock *inet = inet_sk(sk);
193 struct sk_buff *skb;
194 unsigned int ulen, copied;
195 int peeked;
196 int err;
197 int is_udplite = IS_UDPLITE(sk);
198 int is_udp4;
199
200 if (addr_len)
201 *addr_len=sizeof(struct sockaddr_in6);
202
203 if (flags & MSG_ERRQUEUE)
204 return ipv6_recv_error(sk, msg, len);
205
206 try_again:
207 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
208 &peeked, &err);
209 if (!skb)
210 goto out;
211
212 ulen = skb->len - sizeof(struct udphdr);
213 copied = len;
214 if (copied > ulen)
215 copied = ulen;
216 else if (copied < ulen)
217 msg->msg_flags |= MSG_TRUNC;
218
219 is_udp4 = (skb->protocol == htons(ETH_P_IP));
220
221 /*
222 * If checksum is needed at all, try to do it while copying the
223 * data. If the data is truncated, or if we only want a partial
224 * coverage checksum (UDP-Lite), do it before the copy.
225 */
226
227 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
228 if (udp_lib_checksum_complete(skb))
229 goto csum_copy_err;
230 }
231
232 if (skb_csum_unnecessary(skb))
233 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
234 msg->msg_iov, copied );
235 else {
236 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
237 if (err == -EINVAL)
238 goto csum_copy_err;
239 }
240 if (err)
241 goto out_free;
242
243 if (!peeked) {
244 if (is_udp4)
245 UDP_INC_STATS_USER(sock_net(sk),
246 UDP_MIB_INDATAGRAMS, is_udplite);
247 else
248 UDP6_INC_STATS_USER(sock_net(sk),
249 UDP_MIB_INDATAGRAMS, is_udplite);
250 }
251
252 sock_recv_timestamp(msg, sk, skb);
253
254 /* Copy the address. */
255 if (msg->msg_name) {
256 struct sockaddr_in6 *sin6;
257
258 sin6 = (struct sockaddr_in6 *) msg->msg_name;
259 sin6->sin6_family = AF_INET6;
260 sin6->sin6_port = udp_hdr(skb)->source;
261 sin6->sin6_flowinfo = 0;
262 sin6->sin6_scope_id = 0;
263
264 if (is_udp4)
265 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
266 htonl(0xffff), ip_hdr(skb)->saddr);
267 else {
268 ipv6_addr_copy(&sin6->sin6_addr,
269 &ipv6_hdr(skb)->saddr);
270 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
271 sin6->sin6_scope_id = IP6CB(skb)->iif;
272 }
273
274 }
275 if (is_udp4) {
276 if (inet->cmsg_flags)
277 ip_cmsg_recv(msg, skb);
278 } else {
279 if (np->rxopt.all)
280 datagram_recv_ctl(sk, msg, skb);
281 }
282
283 err = copied;
284 if (flags & MSG_TRUNC)
285 err = ulen;
286
287 out_free:
288 lock_sock(sk);
289 skb_free_datagram(sk, skb);
290 release_sock(sk);
291 out:
292 return err;
293
294 csum_copy_err:
295 lock_sock(sk);
296 if (!skb_kill_datagram(sk, skb, flags)) {
297 if (is_udp4)
298 UDP_INC_STATS_USER(sock_net(sk),
299 UDP_MIB_INERRORS, is_udplite);
300 else
301 UDP6_INC_STATS_USER(sock_net(sk),
302 UDP_MIB_INERRORS, is_udplite);
303 }
304 release_sock(sk);
305
306 if (flags & MSG_DONTWAIT)
307 return -EAGAIN;
308 goto try_again;
309 }
310
311 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
312 int type, int code, int offset, __be32 info,
313 struct udp_table *udptable)
314 {
315 struct ipv6_pinfo *np;
316 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
317 struct in6_addr *saddr = &hdr->saddr;
318 struct in6_addr *daddr = &hdr->daddr;
319 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
320 struct sock *sk;
321 int err;
322
323 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
324 saddr, uh->source, inet6_iif(skb), udptable);
325 if (sk == NULL)
326 return;
327
328 np = inet6_sk(sk);
329
330 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
331 goto out;
332
333 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
334 goto out;
335
336 if (np->recverr)
337 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
338
339 sk->sk_err = err;
340 sk->sk_error_report(sk);
341 out:
342 sock_put(sk);
343 }
344
345 static __inline__ void udpv6_err(struct sk_buff *skb,
346 struct inet6_skb_parm *opt, int type,
347 int code, int offset, __be32 info )
348 {
349 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
350 }
351
352 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
353 {
354 struct udp_sock *up = udp_sk(sk);
355 int rc;
356 int is_udplite = IS_UDPLITE(sk);
357
358 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
359 goto drop;
360
361 /*
362 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
363 */
364 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
365
366 if (up->pcrlen == 0) { /* full coverage was set */
367 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
368 " %d while full coverage %d requested\n",
369 UDP_SKB_CB(skb)->cscov, skb->len);
370 goto drop;
371 }
372 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
373 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
374 "too small, need min %d\n",
375 UDP_SKB_CB(skb)->cscov, up->pcrlen);
376 goto drop;
377 }
378 }
379
380 if (sk->sk_filter) {
381 if (udp_lib_checksum_complete(skb))
382 goto drop;
383 }
384
385 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
386 /* Note that an ENOMEM error is charged twice */
387 if (rc == -ENOMEM) {
388 UDP6_INC_STATS_BH(sock_net(sk),
389 UDP_MIB_RCVBUFERRORS, is_udplite);
390 atomic_inc(&sk->sk_drops);
391 }
392 goto drop;
393 }
394
395 return 0;
396 drop:
397 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
398 kfree_skb(skb);
399 return -1;
400 }
401
402 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
403 __be16 loc_port, struct in6_addr *loc_addr,
404 __be16 rmt_port, struct in6_addr *rmt_addr,
405 int dif)
406 {
407 struct hlist_nulls_node *node;
408 struct sock *s = sk;
409 unsigned short num = ntohs(loc_port);
410
411 sk_nulls_for_each_from(s, node) {
412 struct inet_sock *inet = inet_sk(s);
413
414 if (!net_eq(sock_net(s), net))
415 continue;
416
417 if (s->sk_hash == num && s->sk_family == PF_INET6) {
418 struct ipv6_pinfo *np = inet6_sk(s);
419 if (inet->dport) {
420 if (inet->dport != rmt_port)
421 continue;
422 }
423 if (!ipv6_addr_any(&np->daddr) &&
424 !ipv6_addr_equal(&np->daddr, rmt_addr))
425 continue;
426
427 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
428 continue;
429
430 if (!ipv6_addr_any(&np->rcv_saddr)) {
431 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
432 continue;
433 }
434 if (!inet6_mc_check(s, loc_addr, rmt_addr))
435 continue;
436 return s;
437 }
438 }
439 return NULL;
440 }
441
442 /*
443 * Note: called only from the BH handler context,
444 * so we don't need to lock the hashes.
445 */
446 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
447 struct in6_addr *saddr, struct in6_addr *daddr,
448 struct udp_table *udptable)
449 {
450 struct sock *sk, *sk2;
451 const struct udphdr *uh = udp_hdr(skb);
452 struct udp_hslot *hslot = &udptable->hash[udp_hashfn(net, ntohs(uh->dest))];
453 int dif;
454
455 spin_lock(&hslot->lock);
456 sk = sk_nulls_head(&hslot->head);
457 dif = inet6_iif(skb);
458 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
459 if (!sk) {
460 kfree_skb(skb);
461 goto out;
462 }
463
464 sk2 = sk;
465 while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr,
466 uh->source, saddr, dif))) {
467 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
468 if (buff) {
469 bh_lock_sock(sk2);
470 if (!sock_owned_by_user(sk2))
471 udpv6_queue_rcv_skb(sk2, buff);
472 else
473 sk_add_backlog(sk2, buff);
474 bh_unlock_sock(sk2);
475 }
476 }
477 bh_lock_sock(sk);
478 if (!sock_owned_by_user(sk))
479 udpv6_queue_rcv_skb(sk, skb);
480 else
481 sk_add_backlog(sk, skb);
482 bh_unlock_sock(sk);
483 out:
484 spin_unlock(&hslot->lock);
485 return 0;
486 }
487
488 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
489 int proto)
490 {
491 int err;
492
493 UDP_SKB_CB(skb)->partial_cov = 0;
494 UDP_SKB_CB(skb)->cscov = skb->len;
495
496 if (proto == IPPROTO_UDPLITE) {
497 err = udplite_checksum_init(skb, uh);
498 if (err)
499 return err;
500 }
501
502 if (uh->check == 0) {
503 /* RFC 2460 section 8.1 says that we SHOULD log
504 this error. Well, it is reasonable.
505 */
506 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
507 return 1;
508 }
509 if (skb->ip_summed == CHECKSUM_COMPLETE &&
510 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
511 skb->len, proto, skb->csum))
512 skb->ip_summed = CHECKSUM_UNNECESSARY;
513
514 if (!skb_csum_unnecessary(skb))
515 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
516 &ipv6_hdr(skb)->daddr,
517 skb->len, proto, 0));
518
519 return 0;
520 }
521
522 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
523 int proto)
524 {
525 struct sock *sk;
526 struct udphdr *uh;
527 struct net_device *dev = skb->dev;
528 struct in6_addr *saddr, *daddr;
529 u32 ulen = 0;
530 struct net *net = dev_net(skb->dev);
531
532 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
533 goto short_packet;
534
535 saddr = &ipv6_hdr(skb)->saddr;
536 daddr = &ipv6_hdr(skb)->daddr;
537 uh = udp_hdr(skb);
538
539 ulen = ntohs(uh->len);
540 if (ulen > skb->len)
541 goto short_packet;
542
543 if (proto == IPPROTO_UDP) {
544 /* UDP validates ulen. */
545
546 /* Check for jumbo payload */
547 if (ulen == 0)
548 ulen = skb->len;
549
550 if (ulen < sizeof(*uh))
551 goto short_packet;
552
553 if (ulen < skb->len) {
554 if (pskb_trim_rcsum(skb, ulen))
555 goto short_packet;
556 saddr = &ipv6_hdr(skb)->saddr;
557 daddr = &ipv6_hdr(skb)->daddr;
558 uh = udp_hdr(skb);
559 }
560 }
561
562 if (udp6_csum_init(skb, uh, proto))
563 goto discard;
564
565 /*
566 * Multicast receive code
567 */
568 if (ipv6_addr_is_multicast(daddr))
569 return __udp6_lib_mcast_deliver(net, skb,
570 saddr, daddr, udptable);
571
572 /* Unicast */
573
574 /*
575 * check socket cache ... must talk to Alan about his plans
576 * for sock caches... i'll skip this for now.
577 */
578 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
579
580 if (sk == NULL) {
581 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
582 goto discard;
583
584 if (udp_lib_checksum_complete(skb))
585 goto discard;
586 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
587 proto == IPPROTO_UDPLITE);
588
589 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
590
591 kfree_skb(skb);
592 return 0;
593 }
594
595 /* deliver */
596
597 bh_lock_sock(sk);
598 if (!sock_owned_by_user(sk))
599 udpv6_queue_rcv_skb(sk, skb);
600 else
601 sk_add_backlog(sk, skb);
602 bh_unlock_sock(sk);
603 sock_put(sk);
604 return 0;
605
606 short_packet:
607 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
608 proto == IPPROTO_UDPLITE ? "-Lite" : "",
609 ulen, skb->len);
610
611 discard:
612 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
613 kfree_skb(skb);
614 return 0;
615 }
616
617 static __inline__ int udpv6_rcv(struct sk_buff *skb)
618 {
619 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
620 }
621
622 /*
623 * Throw away all pending data and cancel the corking. Socket is locked.
624 */
625 static void udp_v6_flush_pending_frames(struct sock *sk)
626 {
627 struct udp_sock *up = udp_sk(sk);
628
629 if (up->pending == AF_INET)
630 udp_flush_pending_frames(sk);
631 else if (up->pending) {
632 up->len = 0;
633 up->pending = 0;
634 ip6_flush_pending_frames(sk);
635 }
636 }
637
638 /*
639 * Sending
640 */
641
642 static int udp_v6_push_pending_frames(struct sock *sk)
643 {
644 struct sk_buff *skb;
645 struct udphdr *uh;
646 struct udp_sock *up = udp_sk(sk);
647 struct inet_sock *inet = inet_sk(sk);
648 struct flowi *fl = &inet->cork.fl;
649 int err = 0;
650 int is_udplite = IS_UDPLITE(sk);
651 __wsum csum = 0;
652
653 /* Grab the skbuff where UDP header space exists. */
654 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
655 goto out;
656
657 /*
658 * Create a UDP header
659 */
660 uh = udp_hdr(skb);
661 uh->source = fl->fl_ip_sport;
662 uh->dest = fl->fl_ip_dport;
663 uh->len = htons(up->len);
664 uh->check = 0;
665
666 if (is_udplite)
667 csum = udplite_csum_outgoing(sk, skb);
668 else
669 csum = udp_csum_outgoing(sk, skb);
670
671 /* add protocol-dependent pseudo-header */
672 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
673 up->len, fl->proto, csum );
674 if (uh->check == 0)
675 uh->check = CSUM_MANGLED_0;
676
677 err = ip6_push_pending_frames(sk);
678 out:
679 up->len = 0;
680 up->pending = 0;
681 if (!err)
682 UDP6_INC_STATS_USER(sock_net(sk),
683 UDP_MIB_OUTDATAGRAMS, is_udplite);
684 return err;
685 }
686
687 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
688 struct msghdr *msg, size_t len)
689 {
690 struct ipv6_txoptions opt_space;
691 struct udp_sock *up = udp_sk(sk);
692 struct inet_sock *inet = inet_sk(sk);
693 struct ipv6_pinfo *np = inet6_sk(sk);
694 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
695 struct in6_addr *daddr, *final_p = NULL, final;
696 struct ipv6_txoptions *opt = NULL;
697 struct ip6_flowlabel *flowlabel = NULL;
698 struct flowi fl;
699 struct dst_entry *dst;
700 int addr_len = msg->msg_namelen;
701 int ulen = len;
702 int hlimit = -1;
703 int tclass = -1;
704 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
705 int err;
706 int connected = 0;
707 int is_udplite = IS_UDPLITE(sk);
708 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
709
710 /* destination address check */
711 if (sin6) {
712 if (addr_len < offsetof(struct sockaddr, sa_data))
713 return -EINVAL;
714
715 switch (sin6->sin6_family) {
716 case AF_INET6:
717 if (addr_len < SIN6_LEN_RFC2133)
718 return -EINVAL;
719 daddr = &sin6->sin6_addr;
720 break;
721 case AF_INET:
722 goto do_udp_sendmsg;
723 case AF_UNSPEC:
724 msg->msg_name = sin6 = NULL;
725 msg->msg_namelen = addr_len = 0;
726 daddr = NULL;
727 break;
728 default:
729 return -EINVAL;
730 }
731 } else if (!up->pending) {
732 if (sk->sk_state != TCP_ESTABLISHED)
733 return -EDESTADDRREQ;
734 daddr = &np->daddr;
735 } else
736 daddr = NULL;
737
738 if (daddr) {
739 if (ipv6_addr_v4mapped(daddr)) {
740 struct sockaddr_in sin;
741 sin.sin_family = AF_INET;
742 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
743 sin.sin_addr.s_addr = daddr->s6_addr32[3];
744 msg->msg_name = &sin;
745 msg->msg_namelen = sizeof(sin);
746 do_udp_sendmsg:
747 if (__ipv6_only_sock(sk))
748 return -ENETUNREACH;
749 return udp_sendmsg(iocb, sk, msg, len);
750 }
751 }
752
753 if (up->pending == AF_INET)
754 return udp_sendmsg(iocb, sk, msg, len);
755
756 /* Rough check on arithmetic overflow,
757 better check is made in ip6_append_data().
758 */
759 if (len > INT_MAX - sizeof(struct udphdr))
760 return -EMSGSIZE;
761
762 if (up->pending) {
763 /*
764 * There are pending frames.
765 * The socket lock must be held while it's corked.
766 */
767 lock_sock(sk);
768 if (likely(up->pending)) {
769 if (unlikely(up->pending != AF_INET6)) {
770 release_sock(sk);
771 return -EAFNOSUPPORT;
772 }
773 dst = NULL;
774 goto do_append_data;
775 }
776 release_sock(sk);
777 }
778 ulen += sizeof(struct udphdr);
779
780 memset(&fl, 0, sizeof(fl));
781
782 if (sin6) {
783 if (sin6->sin6_port == 0)
784 return -EINVAL;
785
786 fl.fl_ip_dport = sin6->sin6_port;
787 daddr = &sin6->sin6_addr;
788
789 if (np->sndflow) {
790 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
791 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
792 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
793 if (flowlabel == NULL)
794 return -EINVAL;
795 daddr = &flowlabel->dst;
796 }
797 }
798
799 /*
800 * Otherwise it will be difficult to maintain
801 * sk->sk_dst_cache.
802 */
803 if (sk->sk_state == TCP_ESTABLISHED &&
804 ipv6_addr_equal(daddr, &np->daddr))
805 daddr = &np->daddr;
806
807 if (addr_len >= sizeof(struct sockaddr_in6) &&
808 sin6->sin6_scope_id &&
809 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
810 fl.oif = sin6->sin6_scope_id;
811 } else {
812 if (sk->sk_state != TCP_ESTABLISHED)
813 return -EDESTADDRREQ;
814
815 fl.fl_ip_dport = inet->dport;
816 daddr = &np->daddr;
817 fl.fl6_flowlabel = np->flow_label;
818 connected = 1;
819 }
820
821 if (!fl.oif)
822 fl.oif = sk->sk_bound_dev_if;
823
824 if (!fl.oif)
825 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
826
827 if (msg->msg_controllen) {
828 opt = &opt_space;
829 memset(opt, 0, sizeof(struct ipv6_txoptions));
830 opt->tot_len = sizeof(*opt);
831
832 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
833 if (err < 0) {
834 fl6_sock_release(flowlabel);
835 return err;
836 }
837 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
838 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
839 if (flowlabel == NULL)
840 return -EINVAL;
841 }
842 if (!(opt->opt_nflen|opt->opt_flen))
843 opt = NULL;
844 connected = 0;
845 }
846 if (opt == NULL)
847 opt = np->opt;
848 if (flowlabel)
849 opt = fl6_merge_options(&opt_space, flowlabel, opt);
850 opt = ipv6_fixup_options(&opt_space, opt);
851
852 fl.proto = sk->sk_protocol;
853 if (!ipv6_addr_any(daddr))
854 ipv6_addr_copy(&fl.fl6_dst, daddr);
855 else
856 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
857 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
858 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
859 fl.fl_ip_sport = inet->sport;
860
861 /* merge ip6_build_xmit from ip6_output */
862 if (opt && opt->srcrt) {
863 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
864 ipv6_addr_copy(&final, &fl.fl6_dst);
865 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
866 final_p = &final;
867 connected = 0;
868 }
869
870 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
871 fl.oif = np->mcast_oif;
872 connected = 0;
873 }
874
875 security_sk_classify_flow(sk, &fl);
876
877 err = ip6_sk_dst_lookup(sk, &dst, &fl);
878 if (err)
879 goto out;
880 if (final_p)
881 ipv6_addr_copy(&fl.fl6_dst, final_p);
882
883 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
884 if (err < 0) {
885 if (err == -EREMOTE)
886 err = ip6_dst_blackhole(sk, &dst, &fl);
887 if (err < 0)
888 goto out;
889 }
890
891 if (hlimit < 0) {
892 if (ipv6_addr_is_multicast(&fl.fl6_dst))
893 hlimit = np->mcast_hops;
894 else
895 hlimit = np->hop_limit;
896 if (hlimit < 0)
897 hlimit = ip6_dst_hoplimit(dst);
898 }
899
900 if (tclass < 0) {
901 tclass = np->tclass;
902 if (tclass < 0)
903 tclass = 0;
904 }
905
906 if (msg->msg_flags&MSG_CONFIRM)
907 goto do_confirm;
908 back_from_confirm:
909
910 lock_sock(sk);
911 if (unlikely(up->pending)) {
912 /* The socket is already corked while preparing it. */
913 /* ... which is an evident application bug. --ANK */
914 release_sock(sk);
915
916 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
917 err = -EINVAL;
918 goto out;
919 }
920
921 up->pending = AF_INET6;
922
923 do_append_data:
924 up->len += ulen;
925 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
926 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
927 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
928 (struct rt6_info*)dst,
929 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
930 if (err)
931 udp_v6_flush_pending_frames(sk);
932 else if (!corkreq)
933 err = udp_v6_push_pending_frames(sk);
934 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
935 up->pending = 0;
936
937 if (dst) {
938 if (connected) {
939 ip6_dst_store(sk, dst,
940 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
941 &np->daddr : NULL,
942 #ifdef CONFIG_IPV6_SUBTREES
943 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
944 &np->saddr :
945 #endif
946 NULL);
947 } else {
948 dst_release(dst);
949 }
950 dst = NULL;
951 }
952
953 if (err > 0)
954 err = np->recverr ? net_xmit_errno(err) : 0;
955 release_sock(sk);
956 out:
957 dst_release(dst);
958 fl6_sock_release(flowlabel);
959 if (!err)
960 return len;
961 /*
962 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
963 * ENOBUFS might not be good (it's not tunable per se), but otherwise
964 * we don't have a good statistic (IpOutDiscards but it can be too many
965 * things). We could add another new stat but at least for now that
966 * seems like overkill.
967 */
968 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
969 UDP6_INC_STATS_USER(sock_net(sk),
970 UDP_MIB_SNDBUFERRORS, is_udplite);
971 }
972 return err;
973
974 do_confirm:
975 dst_confirm(dst);
976 if (!(msg->msg_flags&MSG_PROBE) || len)
977 goto back_from_confirm;
978 err = 0;
979 goto out;
980 }
981
982 void udpv6_destroy_sock(struct sock *sk)
983 {
984 lock_sock(sk);
985 udp_v6_flush_pending_frames(sk);
986 release_sock(sk);
987
988 inet6_destroy_sock(sk);
989 }
990
991 /*
992 * Socket option code for UDP
993 */
994 int udpv6_setsockopt(struct sock *sk, int level, int optname,
995 char __user *optval, int optlen)
996 {
997 if (level == SOL_UDP || level == SOL_UDPLITE)
998 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
999 udp_v6_push_pending_frames);
1000 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1001 }
1002
1003 #ifdef CONFIG_COMPAT
1004 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1005 char __user *optval, int optlen)
1006 {
1007 if (level == SOL_UDP || level == SOL_UDPLITE)
1008 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1009 udp_v6_push_pending_frames);
1010 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1011 }
1012 #endif
1013
1014 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1015 char __user *optval, int __user *optlen)
1016 {
1017 if (level == SOL_UDP || level == SOL_UDPLITE)
1018 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1019 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1020 }
1021
1022 #ifdef CONFIG_COMPAT
1023 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1024 char __user *optval, int __user *optlen)
1025 {
1026 if (level == SOL_UDP || level == SOL_UDPLITE)
1027 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1028 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1029 }
1030 #endif
1031
1032 static struct inet6_protocol udpv6_protocol = {
1033 .handler = udpv6_rcv,
1034 .err_handler = udpv6_err,
1035 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1036 };
1037
1038 /* ------------------------------------------------------------------------ */
1039 #ifdef CONFIG_PROC_FS
1040
1041 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1042 {
1043 struct inet_sock *inet = inet_sk(sp);
1044 struct ipv6_pinfo *np = inet6_sk(sp);
1045 struct in6_addr *dest, *src;
1046 __u16 destp, srcp;
1047
1048 dest = &np->daddr;
1049 src = &np->rcv_saddr;
1050 destp = ntohs(inet->dport);
1051 srcp = ntohs(inet->sport);
1052 seq_printf(seq,
1053 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1054 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1055 bucket,
1056 src->s6_addr32[0], src->s6_addr32[1],
1057 src->s6_addr32[2], src->s6_addr32[3], srcp,
1058 dest->s6_addr32[0], dest->s6_addr32[1],
1059 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1060 sp->sk_state,
1061 atomic_read(&sp->sk_wmem_alloc),
1062 atomic_read(&sp->sk_rmem_alloc),
1063 0, 0L, 0,
1064 sock_i_uid(sp), 0,
1065 sock_i_ino(sp),
1066 atomic_read(&sp->sk_refcnt), sp,
1067 atomic_read(&sp->sk_drops));
1068 }
1069
1070 int udp6_seq_show(struct seq_file *seq, void *v)
1071 {
1072 if (v == SEQ_START_TOKEN)
1073 seq_printf(seq,
1074 " sl "
1075 "local_address "
1076 "remote_address "
1077 "st tx_queue rx_queue tr tm->when retrnsmt"
1078 " uid timeout inode ref pointer drops\n");
1079 else
1080 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1081 return 0;
1082 }
1083
1084 static struct udp_seq_afinfo udp6_seq_afinfo = {
1085 .name = "udp6",
1086 .family = AF_INET6,
1087 .udp_table = &udp_table,
1088 .seq_fops = {
1089 .owner = THIS_MODULE,
1090 },
1091 .seq_ops = {
1092 .show = udp6_seq_show,
1093 },
1094 };
1095
1096 int udp6_proc_init(struct net *net)
1097 {
1098 return udp_proc_register(net, &udp6_seq_afinfo);
1099 }
1100
1101 void udp6_proc_exit(struct net *net) {
1102 udp_proc_unregister(net, &udp6_seq_afinfo);
1103 }
1104 #endif /* CONFIG_PROC_FS */
1105
1106 /* ------------------------------------------------------------------------ */
1107
1108 struct proto udpv6_prot = {
1109 .name = "UDPv6",
1110 .owner = THIS_MODULE,
1111 .close = udp_lib_close,
1112 .connect = ip6_datagram_connect,
1113 .disconnect = udp_disconnect,
1114 .ioctl = udp_ioctl,
1115 .destroy = udpv6_destroy_sock,
1116 .setsockopt = udpv6_setsockopt,
1117 .getsockopt = udpv6_getsockopt,
1118 .sendmsg = udpv6_sendmsg,
1119 .recvmsg = udpv6_recvmsg,
1120 .backlog_rcv = udpv6_queue_rcv_skb,
1121 .hash = udp_lib_hash,
1122 .unhash = udp_lib_unhash,
1123 .get_port = udp_v6_get_port,
1124 .memory_allocated = &udp_memory_allocated,
1125 .sysctl_mem = sysctl_udp_mem,
1126 .sysctl_wmem = &sysctl_udp_wmem_min,
1127 .sysctl_rmem = &sysctl_udp_rmem_min,
1128 .obj_size = sizeof(struct udp6_sock),
1129 .slab_flags = SLAB_DESTROY_BY_RCU,
1130 .h.udp_table = &udp_table,
1131 #ifdef CONFIG_COMPAT
1132 .compat_setsockopt = compat_udpv6_setsockopt,
1133 .compat_getsockopt = compat_udpv6_getsockopt,
1134 #endif
1135 };
1136
1137 static struct inet_protosw udpv6_protosw = {
1138 .type = SOCK_DGRAM,
1139 .protocol = IPPROTO_UDP,
1140 .prot = &udpv6_prot,
1141 .ops = &inet6_dgram_ops,
1142 .capability =-1,
1143 .no_check = UDP_CSUM_DEFAULT,
1144 .flags = INET_PROTOSW_PERMANENT,
1145 };
1146
1147
1148 int __init udpv6_init(void)
1149 {
1150 int ret;
1151
1152 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1153 if (ret)
1154 goto out;
1155
1156 ret = inet6_register_protosw(&udpv6_protosw);
1157 if (ret)
1158 goto out_udpv6_protocol;
1159 out:
1160 return ret;
1161
1162 out_udpv6_protocol:
1163 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1164 goto out;
1165 }
1166
1167 void udpv6_exit(void)
1168 {
1169 inet6_unregister_protosw(&udpv6_protosw);
1170 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1171 }
linux 2.6 git repository for openrd