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[ALSA] snd-bt87x: Improve support for different board types
[linux-2.6/verdex.git] / net / ipv6 / udp.c
blobcaebad6ee510d8927db4b0df4dd0d8c2dfb5ab42
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 inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
56 {
57 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
58 }
59
60 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
61 struct in6_addr *daddr, __be16 dport,
62 int dif, struct hlist_head udptable[])
63 {
64 struct sock *sk, *result = NULL;
65 struct hlist_node *node;
66 unsigned short hnum = ntohs(dport);
67 int badness = -1;
68
69 read_lock(&udp_hash_lock);
70 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
71 struct inet_sock *inet = inet_sk(sk);
72
73 if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
74 struct ipv6_pinfo *np = inet6_sk(sk);
75 int score = 0;
76 if (inet->dport) {
77 if (inet->dport != sport)
78 continue;
79 score++;
80 }
81 if (!ipv6_addr_any(&np->rcv_saddr)) {
82 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
83 continue;
84 score++;
85 }
86 if (!ipv6_addr_any(&np->daddr)) {
87 if (!ipv6_addr_equal(&np->daddr, saddr))
88 continue;
89 score++;
90 }
91 if (sk->sk_bound_dev_if) {
92 if (sk->sk_bound_dev_if != dif)
93 continue;
94 score++;
95 }
96 if (score == 4) {
97 result = sk;
98 break;
99 } else if (score > badness) {
100 result = sk;
101 badness = score;
102 }
103 }
104 }
105 if (result)
106 sock_hold(result);
107 read_unlock(&udp_hash_lock);
108 return result;
109 }
110
111 /*
112 * This should be easy, if there is something there we
113 * return it, otherwise we block.
114 */
115
116 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
117 struct msghdr *msg, size_t len,
118 int noblock, int flags, int *addr_len)
119 {
120 struct ipv6_pinfo *np = inet6_sk(sk);
121 struct inet_sock *inet = inet_sk(sk);
122 struct sk_buff *skb;
123 unsigned int ulen, copied;
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, &err);
135 if (!skb)
136 goto out;
137
138 ulen = skb->len - sizeof(struct udphdr);
139 copied = len;
140 if (copied > ulen)
141 copied = ulen;
142 else if (copied < ulen)
143 msg->msg_flags |= MSG_TRUNC;
144
145 /*
146 * If checksum is needed at all, try to do it while copying the
147 * data. If the data is truncated, or if we only want a partial
148 * coverage checksum (UDP-Lite), do it before the copy.
149 */
150
151 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
152 if (udp_lib_checksum_complete(skb))
153 goto csum_copy_err;
154 }
155
156 if (skb_csum_unnecessary(skb))
157 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
158 msg->msg_iov, copied );
159 else {
160 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
161 if (err == -EINVAL)
162 goto csum_copy_err;
163 }
164 if (err)
165 goto out_free;
166
167 sock_recv_timestamp(msg, sk, skb);
168
169 /* Copy the address. */
170 if (msg->msg_name) {
171 struct sockaddr_in6 *sin6;
172
173 sin6 = (struct sockaddr_in6 *) msg->msg_name;
174 sin6->sin6_family = AF_INET6;
175 sin6->sin6_port = udp_hdr(skb)->source;
176 sin6->sin6_flowinfo = 0;
177 sin6->sin6_scope_id = 0;
178
179 if (skb->protocol == htons(ETH_P_IP))
180 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
181 htonl(0xffff), ip_hdr(skb)->saddr);
182 else {
183 ipv6_addr_copy(&sin6->sin6_addr,
184 &ipv6_hdr(skb)->saddr);
185 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
186 sin6->sin6_scope_id = IP6CB(skb)->iif;
187 }
188
189 }
190 if (skb->protocol == htons(ETH_P_IP)) {
191 if (inet->cmsg_flags)
192 ip_cmsg_recv(msg, skb);
193 } else {
194 if (np->rxopt.all)
195 datagram_recv_ctl(sk, msg, skb);
196 }
197
198 err = copied;
199 if (flags & MSG_TRUNC)
200 err = ulen;
201
202 out_free:
203 skb_free_datagram(sk, skb);
204 out:
205 return err;
206
207 csum_copy_err:
208 skb_kill_datagram(sk, skb, flags);
209
210 if (flags & MSG_DONTWAIT) {
211 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
212 return -EAGAIN;
213 }
214 goto try_again;
215 }
216
217 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
218 int type, int code, int offset, __be32 info,
219 struct hlist_head udptable[] )
220 {
221 struct ipv6_pinfo *np;
222 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
223 struct in6_addr *saddr = &hdr->saddr;
224 struct in6_addr *daddr = &hdr->daddr;
225 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
226 struct sock *sk;
227 int err;
228
229 sk = __udp6_lib_lookup(daddr, uh->dest,
230 saddr, uh->source, inet6_iif(skb), udptable);
231 if (sk == NULL)
232 return;
233
234 np = inet6_sk(sk);
235
236 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
237 goto out;
238
239 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
240 goto out;
241
242 if (np->recverr)
243 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
244
245 sk->sk_err = err;
246 sk->sk_error_report(sk);
247 out:
248 sock_put(sk);
249 }
250
251 static __inline__ void udpv6_err(struct sk_buff *skb,
252 struct inet6_skb_parm *opt, int type,
253 int code, int offset, __be32 info )
254 {
255 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
256 }
257
258 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
259 {
260 struct udp_sock *up = udp_sk(sk);
261 int rc;
262
263 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
264 goto drop;
265
266 /*
267 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
268 */
269 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
270
271 if (up->pcrlen == 0) { /* full coverage was set */
272 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
273 " %d while full coverage %d requested\n",
274 UDP_SKB_CB(skb)->cscov, skb->len);
275 goto drop;
276 }
277 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
278 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
279 "too small, need min %d\n",
280 UDP_SKB_CB(skb)->cscov, up->pcrlen);
281 goto drop;
282 }
283 }
284
285 if (sk->sk_filter) {
286 if (udp_lib_checksum_complete(skb))
287 goto drop;
288 }
289
290 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
291 /* Note that an ENOMEM error is charged twice */
292 if (rc == -ENOMEM)
293 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
294 goto drop;
295 }
296 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
297 return 0;
298 drop:
299 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
300 kfree_skb(skb);
301 return -1;
302 }
303
304 static struct sock *udp_v6_mcast_next(struct sock *sk,
305 __be16 loc_port, struct in6_addr *loc_addr,
306 __be16 rmt_port, struct in6_addr *rmt_addr,
307 int dif)
308 {
309 struct hlist_node *node;
310 struct sock *s = sk;
311 unsigned short num = ntohs(loc_port);
312
313 sk_for_each_from(s, node) {
314 struct inet_sock *inet = inet_sk(s);
315
316 if (s->sk_hash == num && s->sk_family == PF_INET6) {
317 struct ipv6_pinfo *np = inet6_sk(s);
318 if (inet->dport) {
319 if (inet->dport != rmt_port)
320 continue;
321 }
322 if (!ipv6_addr_any(&np->daddr) &&
323 !ipv6_addr_equal(&np->daddr, rmt_addr))
324 continue;
325
326 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
327 continue;
328
329 if (!ipv6_addr_any(&np->rcv_saddr)) {
330 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
331 continue;
332 }
333 if (!inet6_mc_check(s, loc_addr, rmt_addr))
334 continue;
335 return s;
336 }
337 }
338 return NULL;
339 }
340
341 /*
342 * Note: called only from the BH handler context,
343 * so we don't need to lock the hashes.
344 */
345 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
346 struct in6_addr *daddr, struct hlist_head udptable[])
347 {
348 struct sock *sk, *sk2;
349 const struct udphdr *uh = udp_hdr(skb);
350 int dif;
351
352 read_lock(&udp_hash_lock);
353 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
354 dif = inet6_iif(skb);
355 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
356 if (!sk) {
357 kfree_skb(skb);
358 goto out;
359 }
360
361 sk2 = sk;
362 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
363 uh->source, saddr, dif))) {
364 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
365 if (buff)
366 udpv6_queue_rcv_skb(sk2, buff);
367 }
368 udpv6_queue_rcv_skb(sk, skb);
369 out:
370 read_unlock(&udp_hash_lock);
371 return 0;
372 }
373
374 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
375 int proto)
376 {
377 int err;
378
379 UDP_SKB_CB(skb)->partial_cov = 0;
380 UDP_SKB_CB(skb)->cscov = skb->len;
381
382 if (proto == IPPROTO_UDPLITE) {
383 err = udplite_checksum_init(skb, uh);
384 if (err)
385 return err;
386 }
387
388 if (uh->check == 0) {
389 /* RFC 2460 section 8.1 says that we SHOULD log
390 this error. Well, it is reasonable.
391 */
392 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
393 return 1;
394 }
395 if (skb->ip_summed == CHECKSUM_COMPLETE &&
396 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
397 skb->len, proto, skb->csum))
398 skb->ip_summed = CHECKSUM_UNNECESSARY;
399
400 if (!skb_csum_unnecessary(skb))
401 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
402 &ipv6_hdr(skb)->daddr,
403 skb->len, proto, 0));
404
405 return 0;
406 }
407
408 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
409 int proto)
410 {
411 struct sock *sk;
412 struct udphdr *uh;
413 struct net_device *dev = skb->dev;
414 struct in6_addr *saddr, *daddr;
415 u32 ulen = 0;
416
417 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
418 goto short_packet;
419
420 saddr = &ipv6_hdr(skb)->saddr;
421 daddr = &ipv6_hdr(skb)->daddr;
422 uh = udp_hdr(skb);
423
424 ulen = ntohs(uh->len);
425 if (ulen > skb->len)
426 goto short_packet;
427
428 if (proto == IPPROTO_UDP) {
429 /* UDP validates ulen. */
430
431 /* Check for jumbo payload */
432 if (ulen == 0)
433 ulen = skb->len;
434
435 if (ulen < sizeof(*uh))
436 goto short_packet;
437
438 if (ulen < skb->len) {
439 if (pskb_trim_rcsum(skb, ulen))
440 goto short_packet;
441 saddr = &ipv6_hdr(skb)->saddr;
442 daddr = &ipv6_hdr(skb)->daddr;
443 uh = udp_hdr(skb);
444 }
445 }
446
447 if (udp6_csum_init(skb, uh, proto))
448 goto discard;
449
450 /*
451 * Multicast receive code
452 */
453 if (ipv6_addr_is_multicast(daddr))
454 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
455
456 /* Unicast */
457
458 /*
459 * check socket cache ... must talk to Alan about his plans
460 * for sock caches... i'll skip this for now.
461 */
462 sk = __udp6_lib_lookup(saddr, uh->source,
463 daddr, uh->dest, inet6_iif(skb), udptable);
464
465 if (sk == NULL) {
466 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
467 goto discard;
468
469 if (udp_lib_checksum_complete(skb))
470 goto discard;
471 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
472
473 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
474
475 kfree_skb(skb);
476 return 0;
477 }
478
479 /* deliver */
480
481 udpv6_queue_rcv_skb(sk, skb);
482 sock_put(sk);
483 return 0;
484
485 short_packet:
486 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
487 proto == IPPROTO_UDPLITE ? "-Lite" : "",
488 ulen, skb->len);
489
490 discard:
491 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
492 kfree_skb(skb);
493 return 0;
494 }
495
496 static __inline__ int udpv6_rcv(struct sk_buff *skb)
497 {
498 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
499 }
500
501 /*
502 * Throw away all pending data and cancel the corking. Socket is locked.
503 */
504 static void udp_v6_flush_pending_frames(struct sock *sk)
505 {
506 struct udp_sock *up = udp_sk(sk);
507
508 if (up->pending) {
509 up->len = 0;
510 up->pending = 0;
511 ip6_flush_pending_frames(sk);
512 }
513 }
514
515 /*
516 * Sending
517 */
518
519 static int udp_v6_push_pending_frames(struct sock *sk)
520 {
521 struct sk_buff *skb;
522 struct udphdr *uh;
523 struct udp_sock *up = udp_sk(sk);
524 struct inet_sock *inet = inet_sk(sk);
525 struct flowi *fl = &inet->cork.fl;
526 int err = 0;
527 __wsum csum = 0;
528
529 /* Grab the skbuff where UDP header space exists. */
530 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
531 goto out;
532
533 /*
534 * Create a UDP header
535 */
536 uh = udp_hdr(skb);
537 uh->source = fl->fl_ip_sport;
538 uh->dest = fl->fl_ip_dport;
539 uh->len = htons(up->len);
540 uh->check = 0;
541
542 if (up->pcflag)
543 csum = udplite_csum_outgoing(sk, skb);
544 else
545 csum = udp_csum_outgoing(sk, skb);
546
547 /* add protocol-dependent pseudo-header */
548 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
549 up->len, fl->proto, csum );
550 if (uh->check == 0)
551 uh->check = CSUM_MANGLED_0;
552
553 err = ip6_push_pending_frames(sk);
554 out:
555 up->len = 0;
556 up->pending = 0;
557 if (!err)
558 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, up->pcflag);
559 return err;
560 }
561
562 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
563 struct msghdr *msg, size_t len)
564 {
565 struct ipv6_txoptions opt_space;
566 struct udp_sock *up = udp_sk(sk);
567 struct inet_sock *inet = inet_sk(sk);
568 struct ipv6_pinfo *np = inet6_sk(sk);
569 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
570 struct in6_addr *daddr, *final_p = NULL, final;
571 struct ipv6_txoptions *opt = NULL;
572 struct ip6_flowlabel *flowlabel = NULL;
573 struct flowi fl;
574 struct dst_entry *dst;
575 int addr_len = msg->msg_namelen;
576 int ulen = len;
577 int hlimit = -1;
578 int tclass = -1;
579 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
580 int err;
581 int connected = 0;
582 int is_udplite = up->pcflag;
583 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
584
585 /* destination address check */
586 if (sin6) {
587 if (addr_len < offsetof(struct sockaddr, sa_data))
588 return -EINVAL;
589
590 switch (sin6->sin6_family) {
591 case AF_INET6:
592 if (addr_len < SIN6_LEN_RFC2133)
593 return -EINVAL;
594 daddr = &sin6->sin6_addr;
595 break;
596 case AF_INET:
597 goto do_udp_sendmsg;
598 case AF_UNSPEC:
599 msg->msg_name = sin6 = NULL;
600 msg->msg_namelen = addr_len = 0;
601 daddr = NULL;
602 break;
603 default:
604 return -EINVAL;
605 }
606 } else if (!up->pending) {
607 if (sk->sk_state != TCP_ESTABLISHED)
608 return -EDESTADDRREQ;
609 daddr = &np->daddr;
610 } else
611 daddr = NULL;
612
613 if (daddr) {
614 if (ipv6_addr_v4mapped(daddr)) {
615 struct sockaddr_in sin;
616 sin.sin_family = AF_INET;
617 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
618 sin.sin_addr.s_addr = daddr->s6_addr32[3];
619 msg->msg_name = &sin;
620 msg->msg_namelen = sizeof(sin);
621 do_udp_sendmsg:
622 if (__ipv6_only_sock(sk))
623 return -ENETUNREACH;
624 return udp_sendmsg(iocb, sk, msg, len);
625 }
626 }
627
628 if (up->pending == AF_INET)
629 return udp_sendmsg(iocb, sk, msg, len);
630
631 /* Rough check on arithmetic overflow,
632 better check is made in ip6_append_data().
633 */
634 if (len > INT_MAX - sizeof(struct udphdr))
635 return -EMSGSIZE;
636
637 if (up->pending) {
638 /*
639 * There are pending frames.
640 * The socket lock must be held while it's corked.
641 */
642 lock_sock(sk);
643 if (likely(up->pending)) {
644 if (unlikely(up->pending != AF_INET6)) {
645 release_sock(sk);
646 return -EAFNOSUPPORT;
647 }
648 dst = NULL;
649 goto do_append_data;
650 }
651 release_sock(sk);
652 }
653 ulen += sizeof(struct udphdr);
654
655 memset(&fl, 0, sizeof(fl));
656
657 if (sin6) {
658 if (sin6->sin6_port == 0)
659 return -EINVAL;
660
661 fl.fl_ip_dport = sin6->sin6_port;
662 daddr = &sin6->sin6_addr;
663
664 if (np->sndflow) {
665 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
666 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
667 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
668 if (flowlabel == NULL)
669 return -EINVAL;
670 daddr = &flowlabel->dst;
671 }
672 }
673
674 /*
675 * Otherwise it will be difficult to maintain
676 * sk->sk_dst_cache.
677 */
678 if (sk->sk_state == TCP_ESTABLISHED &&
679 ipv6_addr_equal(daddr, &np->daddr))
680 daddr = &np->daddr;
681
682 if (addr_len >= sizeof(struct sockaddr_in6) &&
683 sin6->sin6_scope_id &&
684 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
685 fl.oif = sin6->sin6_scope_id;
686 } else {
687 if (sk->sk_state != TCP_ESTABLISHED)
688 return -EDESTADDRREQ;
689
690 fl.fl_ip_dport = inet->dport;
691 daddr = &np->daddr;
692 fl.fl6_flowlabel = np->flow_label;
693 connected = 1;
694 }
695
696 if (!fl.oif)
697 fl.oif = sk->sk_bound_dev_if;
698
699 if (msg->msg_controllen) {
700 opt = &opt_space;
701 memset(opt, 0, sizeof(struct ipv6_txoptions));
702 opt->tot_len = sizeof(*opt);
703
704 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
705 if (err < 0) {
706 fl6_sock_release(flowlabel);
707 return err;
708 }
709 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
710 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
711 if (flowlabel == NULL)
712 return -EINVAL;
713 }
714 if (!(opt->opt_nflen|opt->opt_flen))
715 opt = NULL;
716 connected = 0;
717 }
718 if (opt == NULL)
719 opt = np->opt;
720 if (flowlabel)
721 opt = fl6_merge_options(&opt_space, flowlabel, opt);
722 opt = ipv6_fixup_options(&opt_space, opt);
723
724 fl.proto = sk->sk_protocol;
725 ipv6_addr_copy(&fl.fl6_dst, daddr);
726 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
727 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
728 fl.fl_ip_sport = inet->sport;
729
730 /* merge ip6_build_xmit from ip6_output */
731 if (opt && opt->srcrt) {
732 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
733 ipv6_addr_copy(&final, &fl.fl6_dst);
734 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
735 final_p = &final;
736 connected = 0;
737 }
738
739 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
740 fl.oif = np->mcast_oif;
741 connected = 0;
742 }
743
744 security_sk_classify_flow(sk, &fl);
745
746 err = ip6_sk_dst_lookup(sk, &dst, &fl);
747 if (err)
748 goto out;
749 if (final_p)
750 ipv6_addr_copy(&fl.fl6_dst, final_p);
751
752 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
753 if (err == -EREMOTE)
754 err = ip6_dst_blackhole(sk, &dst, &fl);
755 if (err < 0)
756 goto out;
757 }
758
759 if (hlimit < 0) {
760 if (ipv6_addr_is_multicast(&fl.fl6_dst))
761 hlimit = np->mcast_hops;
762 else
763 hlimit = np->hop_limit;
764 if (hlimit < 0)
765 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
766 if (hlimit < 0)
767 hlimit = ipv6_get_hoplimit(dst->dev);
768 }
769
770 if (tclass < 0) {
771 tclass = np->tclass;
772 if (tclass < 0)
773 tclass = 0;
774 }
775
776 if (msg->msg_flags&MSG_CONFIRM)
777 goto do_confirm;
778 back_from_confirm:
779
780 lock_sock(sk);
781 if (unlikely(up->pending)) {
782 /* The socket is already corked while preparing it. */
783 /* ... which is an evident application bug. --ANK */
784 release_sock(sk);
785
786 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
787 err = -EINVAL;
788 goto out;
789 }
790
791 up->pending = AF_INET6;
792
793 do_append_data:
794 up->len += ulen;
795 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
796 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
797 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
798 (struct rt6_info*)dst,
799 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
800 if (err)
801 udp_v6_flush_pending_frames(sk);
802 else if (!corkreq)
803 err = udp_v6_push_pending_frames(sk);
804 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
805 up->pending = 0;
806
807 if (dst) {
808 if (connected) {
809 ip6_dst_store(sk, dst,
810 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
811 &np->daddr : NULL,
812 #ifdef CONFIG_IPV6_SUBTREES
813 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
814 &np->saddr :
815 #endif
816 NULL);
817 } else {
818 dst_release(dst);
819 }
820 }
821
822 if (err > 0)
823 err = np->recverr ? net_xmit_errno(err) : 0;
824 release_sock(sk);
825 out:
826 fl6_sock_release(flowlabel);
827 if (!err)
828 return len;
829 /*
830 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
831 * ENOBUFS might not be good (it's not tunable per se), but otherwise
832 * we don't have a good statistic (IpOutDiscards but it can be too many
833 * things). We could add another new stat but at least for now that
834 * seems like overkill.
835 */
836 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
837 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
838 }
839 return err;
840
841 do_confirm:
842 dst_confirm(dst);
843 if (!(msg->msg_flags&MSG_PROBE) || len)
844 goto back_from_confirm;
845 err = 0;
846 goto out;
847 }
848
849 int udpv6_destroy_sock(struct sock *sk)
850 {
851 lock_sock(sk);
852 udp_v6_flush_pending_frames(sk);
853 release_sock(sk);
854
855 inet6_destroy_sock(sk);
856
857 return 0;
858 }
859
860 /*
861 * Socket option code for UDP
862 */
863 int udpv6_setsockopt(struct sock *sk, int level, int optname,
864 char __user *optval, int optlen)
865 {
866 if (level == SOL_UDP || level == SOL_UDPLITE)
867 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
868 udp_v6_push_pending_frames);
869 return ipv6_setsockopt(sk, level, optname, optval, optlen);
870 }
871
872 #ifdef CONFIG_COMPAT
873 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
874 char __user *optval, int optlen)
875 {
876 if (level == SOL_UDP || level == SOL_UDPLITE)
877 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
878 udp_v6_push_pending_frames);
879 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
880 }
881 #endif
882
883 int udpv6_getsockopt(struct sock *sk, int level, int optname,
884 char __user *optval, int __user *optlen)
885 {
886 if (level == SOL_UDP || level == SOL_UDPLITE)
887 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
888 return ipv6_getsockopt(sk, level, optname, optval, optlen);
889 }
890
891 #ifdef CONFIG_COMPAT
892 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
893 char __user *optval, int __user *optlen)
894 {
895 if (level == SOL_UDP || level == SOL_UDPLITE)
896 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
897 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
898 }
899 #endif
900
901 static struct inet6_protocol udpv6_protocol = {
902 .handler = udpv6_rcv,
903 .err_handler = udpv6_err,
904 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
905 };
906
907 /* ------------------------------------------------------------------------ */
908 #ifdef CONFIG_PROC_FS
909
910 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
911 {
912 struct inet_sock *inet = inet_sk(sp);
913 struct ipv6_pinfo *np = inet6_sk(sp);
914 struct in6_addr *dest, *src;
915 __u16 destp, srcp;
916
917 dest = &np->daddr;
918 src = &np->rcv_saddr;
919 destp = ntohs(inet->dport);
920 srcp = ntohs(inet->sport);
921 seq_printf(seq,
922 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
923 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
924 bucket,
925 src->s6_addr32[0], src->s6_addr32[1],
926 src->s6_addr32[2], src->s6_addr32[3], srcp,
927 dest->s6_addr32[0], dest->s6_addr32[1],
928 dest->s6_addr32[2], dest->s6_addr32[3], destp,
929 sp->sk_state,
930 atomic_read(&sp->sk_wmem_alloc),
931 atomic_read(&sp->sk_rmem_alloc),
932 0, 0L, 0,
933 sock_i_uid(sp), 0,
934 sock_i_ino(sp),
935 atomic_read(&sp->sk_refcnt), sp);
936 }
937
938 int udp6_seq_show(struct seq_file *seq, void *v)
939 {
940 if (v == SEQ_START_TOKEN)
941 seq_printf(seq,
942 " sl "
943 "local_address "
944 "remote_address "
945 "st tx_queue rx_queue tr tm->when retrnsmt"
946 " uid timeout inode\n");
947 else
948 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
949 return 0;
950 }
951
952 static struct file_operations udp6_seq_fops;
953 static struct udp_seq_afinfo udp6_seq_afinfo = {
954 .owner = THIS_MODULE,
955 .name = "udp6",
956 .family = AF_INET6,
957 .hashtable = udp_hash,
958 .seq_show = udp6_seq_show,
959 .seq_fops = &udp6_seq_fops,
960 };
961
962 int __init udp6_proc_init(void)
963 {
964 return udp_proc_register(&udp6_seq_afinfo);
965 }
966
967 void udp6_proc_exit(void) {
968 udp_proc_unregister(&udp6_seq_afinfo);
969 }
970 #endif /* CONFIG_PROC_FS */
971
972 /* ------------------------------------------------------------------------ */
973
974 struct proto udpv6_prot = {
975 .name = "UDPv6",
976 .owner = THIS_MODULE,
977 .close = udp_lib_close,
978 .connect = ip6_datagram_connect,
979 .disconnect = udp_disconnect,
980 .ioctl = udp_ioctl,
981 .destroy = udpv6_destroy_sock,
982 .setsockopt = udpv6_setsockopt,
983 .getsockopt = udpv6_getsockopt,
984 .sendmsg = udpv6_sendmsg,
985 .recvmsg = udpv6_recvmsg,
986 .backlog_rcv = udpv6_queue_rcv_skb,
987 .hash = udp_lib_hash,
988 .unhash = udp_lib_unhash,
989 .get_port = udp_v6_get_port,
990 .obj_size = sizeof(struct udp6_sock),
991 #ifdef CONFIG_COMPAT
992 .compat_setsockopt = compat_udpv6_setsockopt,
993 .compat_getsockopt = compat_udpv6_getsockopt,
994 #endif
995 };
996
997 static struct inet_protosw udpv6_protosw = {
998 .type = SOCK_DGRAM,
999 .protocol = IPPROTO_UDP,
1000 .prot = &udpv6_prot,
1001 .ops = &inet6_dgram_ops,
1002 .capability =-1,
1003 .no_check = UDP_CSUM_DEFAULT,
1004 .flags = INET_PROTOSW_PERMANENT,
1005 };
1006
1007
1008 void __init udpv6_init(void)
1009 {
1010 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1011 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1012 inet6_register_protosw(&udpv6_protosw);
1013 }
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