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allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / ipv6 / udp.c
blob05991128421936206ff883d357e93d7f8d66cd86
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 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
112 __be16 sport, __be16 dport,
113 struct hlist_head udptable[])
114 {
115 struct sock *sk;
116 struct ipv6hdr *iph = ipv6_hdr(skb);
117
118 if (unlikely(sk = skb_steal_sock(skb)))
119 return sk;
120 else
121 return __udp6_lib_lookup(&iph->saddr, sport,
122 &iph->daddr, dport, inet6_iif(skb),
123 udptable);
124 }
125
126 /*
127 * This should be easy, if there is something there we
128 * return it, otherwise we block.
129 */
130
131 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
132 struct msghdr *msg, size_t len,
133 int noblock, int flags, int *addr_len)
134 {
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct inet_sock *inet = inet_sk(sk);
137 struct sk_buff *skb;
138 unsigned int ulen, copied;
139 int err;
140 int is_udplite = IS_UDPLITE(sk);
141
142 if (addr_len)
143 *addr_len=sizeof(struct sockaddr_in6);
144
145 if (flags & MSG_ERRQUEUE)
146 return ipv6_recv_error(sk, msg, len);
147
148 try_again:
149 skb = skb_recv_datagram(sk, flags, noblock, &err);
150 if (!skb)
151 goto out;
152
153 ulen = skb->len - sizeof(struct udphdr);
154 copied = len;
155 if (copied > ulen)
156 copied = ulen;
157 else if (copied < ulen)
158 msg->msg_flags |= MSG_TRUNC;
159
160 /*
161 * If checksum is needed at all, try to do it while copying the
162 * data. If the data is truncated, or if we only want a partial
163 * coverage checksum (UDP-Lite), do it before the copy.
164 */
165
166 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
167 if (udp_lib_checksum_complete(skb))
168 goto csum_copy_err;
169 }
170
171 if (skb_csum_unnecessary(skb))
172 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
173 msg->msg_iov, copied );
174 else {
175 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
176 if (err == -EINVAL)
177 goto csum_copy_err;
178 }
179 if (err)
180 goto out_free;
181
182 sock_recv_timestamp(msg, sk, skb);
183
184 /* Copy the address. */
185 if (msg->msg_name) {
186 struct sockaddr_in6 *sin6;
187
188 sin6 = (struct sockaddr_in6 *) msg->msg_name;
189 sin6->sin6_family = AF_INET6;
190 sin6->sin6_port = udp_hdr(skb)->source;
191 sin6->sin6_flowinfo = 0;
192 sin6->sin6_scope_id = 0;
193
194 if (skb->protocol == htons(ETH_P_IP))
195 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
196 &sin6->sin6_addr);
197 else {
198 ipv6_addr_copy(&sin6->sin6_addr,
199 &ipv6_hdr(skb)->saddr);
200 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
201 sin6->sin6_scope_id = IP6CB(skb)->iif;
202 }
203
204 }
205 if (skb->protocol == htons(ETH_P_IP)) {
206 if (inet->cmsg_flags)
207 ip_cmsg_recv(msg, skb);
208 } else {
209 if (np->rxopt.all)
210 datagram_recv_ctl(sk, msg, skb);
211 }
212
213 err = copied;
214 if (flags & MSG_TRUNC)
215 err = ulen;
216
217 out_free:
218 skb_free_datagram_locked(sk, skb);
219 out:
220 return err;
221
222 csum_copy_err:
223 skb_kill_datagram(sk, skb, flags);
224
225 if (flags & MSG_DONTWAIT) {
226 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
227 return -EAGAIN;
228 }
229 goto try_again;
230 }
231
232 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
233 int type, int code, int offset, __be32 info,
234 struct hlist_head udptable[] )
235 {
236 struct ipv6_pinfo *np;
237 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
238 struct in6_addr *saddr = &hdr->saddr;
239 struct in6_addr *daddr = &hdr->daddr;
240 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
241 struct sock *sk;
242 int err;
243
244 sk = __udp6_lib_lookup(daddr, uh->dest,
245 saddr, uh->source, inet6_iif(skb), udptable);
246 if (sk == NULL)
247 return;
248
249 np = inet6_sk(sk);
250
251 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
252 goto out;
253
254 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
255 goto out;
256
257 if (np->recverr)
258 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
259
260 sk->sk_err = err;
261 sk->sk_error_report(sk);
262 out:
263 sock_put(sk);
264 }
265
266 static __inline__ void udpv6_err(struct sk_buff *skb,
267 struct inet6_skb_parm *opt, int type,
268 int code, int offset, __be32 info )
269 {
270 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
271 }
272
273 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
274 {
275 struct udp_sock *up = udp_sk(sk);
276 int rc;
277
278 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
279 goto drop;
280
281 /*
282 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
283 */
284 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
285
286 if (up->pcrlen == 0) { /* full coverage was set */
287 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
288 " %d while full coverage %d requested\n",
289 UDP_SKB_CB(skb)->cscov, skb->len);
290 goto drop;
291 }
292 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
293 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
294 "too small, need min %d\n",
295 UDP_SKB_CB(skb)->cscov, up->pcrlen);
296 goto drop;
297 }
298 }
299
300 if (sk->sk_filter) {
301 if (udp_lib_checksum_complete(skb))
302 goto drop;
303 }
304
305 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
306 /* Note that an ENOMEM error is charged twice */
307 if (rc == -ENOMEM)
308 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
309 goto drop;
310 }
311 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
312 return 0;
313 drop:
314 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
315 kfree_skb(skb);
316 return -1;
317 }
318
319 static struct sock *udp_v6_mcast_next(struct sock *sk,
320 __be16 loc_port, struct in6_addr *loc_addr,
321 __be16 rmt_port, struct in6_addr *rmt_addr,
322 int dif)
323 {
324 struct hlist_node *node;
325 struct sock *s = sk;
326 unsigned short num = ntohs(loc_port);
327
328 sk_for_each_from(s, node) {
329 struct inet_sock *inet = inet_sk(s);
330
331 if (s->sk_hash == num && s->sk_family == PF_INET6) {
332 struct ipv6_pinfo *np = inet6_sk(s);
333 if (inet->dport) {
334 if (inet->dport != rmt_port)
335 continue;
336 }
337 if (!ipv6_addr_any(&np->daddr) &&
338 !ipv6_addr_equal(&np->daddr, rmt_addr))
339 continue;
340
341 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
342 continue;
343
344 if (!ipv6_addr_any(&np->rcv_saddr)) {
345 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
346 continue;
347 }
348 if (!inet6_mc_check(s, loc_addr, rmt_addr))
349 continue;
350 return s;
351 }
352 }
353 return NULL;
354 }
355
356 /*
357 * Note: called only from the BH handler context,
358 * so we don't need to lock the hashes.
359 */
360 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
361 struct in6_addr *daddr, struct hlist_head udptable[])
362 {
363 struct sock *sk, *sk2;
364 const struct udphdr *uh = udp_hdr(skb);
365 int dif;
366
367 read_lock(&udp_hash_lock);
368 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
369 dif = inet6_iif(skb);
370 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
371 if (!sk) {
372 kfree_skb(skb);
373 goto out;
374 }
375
376 sk2 = sk;
377 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
378 uh->source, saddr, dif))) {
379 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
380 if (buff)
381 udpv6_queue_rcv_skb(sk2, buff);
382 }
383 udpv6_queue_rcv_skb(sk, skb);
384 out:
385 read_unlock(&udp_hash_lock);
386 return 0;
387 }
388
389 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
390 int proto)
391 {
392 int err;
393
394 UDP_SKB_CB(skb)->partial_cov = 0;
395 UDP_SKB_CB(skb)->cscov = skb->len;
396
397 if (proto == IPPROTO_UDPLITE) {
398 err = udplite_checksum_init(skb, uh);
399 if (err)
400 return err;
401 }
402
403 if (uh->check == 0) {
404 /* RFC 2460 section 8.1 says that we SHOULD log
405 this error. Well, it is reasonable.
406 */
407 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
408 return 1;
409 }
410 if (skb->ip_summed == CHECKSUM_COMPLETE &&
411 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
412 skb->len, proto, skb->csum))
413 skb->ip_summed = CHECKSUM_UNNECESSARY;
414
415 if (!skb_csum_unnecessary(skb))
416 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
417 &ipv6_hdr(skb)->daddr,
418 skb->len, proto, 0));
419
420 return 0;
421 }
422
423 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
424 int proto)
425 {
426 struct sock *sk;
427 struct udphdr *uh;
428 struct net_device *dev = skb->dev;
429 struct in6_addr *saddr, *daddr;
430 u32 ulen = 0;
431
432 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
433 goto short_packet;
434
435 saddr = &ipv6_hdr(skb)->saddr;
436 daddr = &ipv6_hdr(skb)->daddr;
437 uh = udp_hdr(skb);
438
439 ulen = ntohs(uh->len);
440 if (ulen > skb->len)
441 goto short_packet;
442
443 if (proto == IPPROTO_UDP) {
444 /* UDP validates ulen. */
445
446 /* Check for jumbo payload */
447 if (ulen == 0)
448 ulen = skb->len;
449
450 if (ulen < sizeof(*uh))
451 goto short_packet;
452
453 if (ulen < skb->len) {
454 if (pskb_trim_rcsum(skb, ulen))
455 goto short_packet;
456 saddr = &ipv6_hdr(skb)->saddr;
457 daddr = &ipv6_hdr(skb)->daddr;
458 uh = udp_hdr(skb);
459 }
460 }
461
462 if (udp6_csum_init(skb, uh, proto))
463 goto discard;
464
465 /*
466 * Multicast receive code
467 */
468 if (ipv6_addr_is_multicast(daddr))
469 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
470
471 /* Unicast */
472
473 /*
474 * check socket cache ... must talk to Alan about his plans
475 * for sock caches... i'll skip this for now.
476 */
477 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
478
479 if (sk == NULL) {
480 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
481 goto discard;
482
483 if (udp_lib_checksum_complete(skb))
484 goto discard;
485 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
486
487 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
488
489 kfree_skb(skb);
490 return 0;
491 }
492
493 /* deliver */
494
495 udpv6_queue_rcv_skb(sk, skb);
496 sock_put(sk);
497 return 0;
498
499 short_packet:
500 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
501 proto == IPPROTO_UDPLITE ? "-Lite" : "",
502 ulen, skb->len);
503
504 discard:
505 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
506 kfree_skb(skb);
507 return 0;
508 }
509
510 static __inline__ int udpv6_rcv(struct sk_buff *skb)
511 {
512 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
513 }
514
515 /*
516 * Throw away all pending data and cancel the corking. Socket is locked.
517 */
518 static void udp_v6_flush_pending_frames(struct sock *sk)
519 {
520 struct udp_sock *up = udp_sk(sk);
521
522 if (up->pending) {
523 up->len = 0;
524 up->pending = 0;
525 ip6_flush_pending_frames(sk);
526 }
527 }
528
529 /*
530 * Sending
531 */
532
533 static int udp_v6_push_pending_frames(struct sock *sk)
534 {
535 struct sk_buff *skb;
536 struct udphdr *uh;
537 struct udp_sock *up = udp_sk(sk);
538 struct inet_sock *inet = inet_sk(sk);
539 struct flowi *fl = &inet->cork.fl;
540 int err = 0;
541 __wsum csum = 0;
542
543 /* Grab the skbuff where UDP header space exists. */
544 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
545 goto out;
546
547 /*
548 * Create a UDP header
549 */
550 uh = udp_hdr(skb);
551 uh->source = fl->fl_ip_sport;
552 uh->dest = fl->fl_ip_dport;
553 uh->len = htons(up->len);
554 uh->check = 0;
555
556 if (up->pcflag)
557 csum = udplite_csum_outgoing(sk, skb);
558 else
559 csum = udp_csum_outgoing(sk, skb);
560
561 /* add protocol-dependent pseudo-header */
562 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
563 up->len, fl->proto, csum );
564 if (uh->check == 0)
565 uh->check = CSUM_MANGLED_0;
566
567 err = ip6_push_pending_frames(sk);
568 out:
569 up->len = 0;
570 up->pending = 0;
571 return err;
572 }
573
574 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
575 struct msghdr *msg, size_t len)
576 {
577 struct ipv6_txoptions opt_space;
578 struct udp_sock *up = udp_sk(sk);
579 struct inet_sock *inet = inet_sk(sk);
580 struct ipv6_pinfo *np = inet6_sk(sk);
581 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
582 struct in6_addr *daddr, *final_p = NULL, final;
583 struct ipv6_txoptions *opt = NULL;
584 struct ip6_flowlabel *flowlabel = NULL;
585 struct flowi fl;
586 struct dst_entry *dst;
587 int addr_len = msg->msg_namelen;
588 int ulen = len;
589 int hlimit = -1;
590 int tclass = -1;
591 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
592 int err;
593 int connected = 0;
594 int is_udplite = up->pcflag;
595 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
596
597 /* destination address check */
598 if (sin6) {
599 if (addr_len < offsetof(struct sockaddr, sa_data))
600 return -EINVAL;
601
602 switch (sin6->sin6_family) {
603 case AF_INET6:
604 if (addr_len < SIN6_LEN_RFC2133)
605 return -EINVAL;
606 daddr = &sin6->sin6_addr;
607 break;
608 case AF_INET:
609 goto do_udp_sendmsg;
610 case AF_UNSPEC:
611 msg->msg_name = sin6 = NULL;
612 msg->msg_namelen = addr_len = 0;
613 daddr = NULL;
614 break;
615 default:
616 return -EINVAL;
617 }
618 } else if (!up->pending) {
619 if (sk->sk_state != TCP_ESTABLISHED)
620 return -EDESTADDRREQ;
621 daddr = &np->daddr;
622 } else
623 daddr = NULL;
624
625 if (daddr) {
626 if (ipv6_addr_v4mapped(daddr)) {
627 struct sockaddr_in sin;
628 sin.sin_family = AF_INET;
629 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
630 sin.sin_addr.s_addr = daddr->s6_addr32[3];
631 msg->msg_name = &sin;
632 msg->msg_namelen = sizeof(sin);
633 do_udp_sendmsg:
634 if (__ipv6_only_sock(sk))
635 return -ENETUNREACH;
636 return udp_sendmsg(iocb, sk, msg, len);
637 }
638 }
639
640 if (up->pending == AF_INET)
641 return udp_sendmsg(iocb, sk, msg, len);
642
643 /* Rough check on arithmetic overflow,
644 better check is made in ip6_append_data().
645 */
646 if (len > INT_MAX - sizeof(struct udphdr))
647 return -EMSGSIZE;
648
649 if (up->pending) {
650 /*
651 * There are pending frames.
652 * The socket lock must be held while it's corked.
653 */
654 lock_sock(sk);
655 if (likely(up->pending)) {
656 if (unlikely(up->pending != AF_INET6)) {
657 release_sock(sk);
658 return -EAFNOSUPPORT;
659 }
660 dst = NULL;
661 goto do_append_data;
662 }
663 release_sock(sk);
664 }
665 ulen += sizeof(struct udphdr);
666
667 memset(&fl, 0, sizeof(fl));
668
669 if (sin6) {
670 if (sin6->sin6_port == 0)
671 return -EINVAL;
672
673 fl.fl_ip_dport = sin6->sin6_port;
674 daddr = &sin6->sin6_addr;
675
676 if (np->sndflow) {
677 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
678 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
679 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
680 if (flowlabel == NULL)
681 return -EINVAL;
682 daddr = &flowlabel->dst;
683 }
684 }
685
686 /*
687 * Otherwise it will be difficult to maintain
688 * sk->sk_dst_cache.
689 */
690 if (sk->sk_state == TCP_ESTABLISHED &&
691 ipv6_addr_equal(daddr, &np->daddr))
692 daddr = &np->daddr;
693
694 if (addr_len >= sizeof(struct sockaddr_in6) &&
695 sin6->sin6_scope_id &&
696 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
697 fl.oif = sin6->sin6_scope_id;
698 } else {
699 if (sk->sk_state != TCP_ESTABLISHED)
700 return -EDESTADDRREQ;
701
702 fl.fl_ip_dport = inet->dport;
703 daddr = &np->daddr;
704 fl.fl6_flowlabel = np->flow_label;
705 connected = 1;
706 }
707
708 if (!fl.oif)
709 fl.oif = sk->sk_bound_dev_if;
710
711 if (msg->msg_controllen) {
712 opt = &opt_space;
713 memset(opt, 0, sizeof(struct ipv6_txoptions));
714 opt->tot_len = sizeof(*opt);
715
716 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
717 if (err < 0) {
718 fl6_sock_release(flowlabel);
719 return err;
720 }
721 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
722 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
723 if (flowlabel == NULL)
724 return -EINVAL;
725 }
726 if (!(opt->opt_nflen|opt->opt_flen))
727 opt = NULL;
728 connected = 0;
729 }
730 if (opt == NULL)
731 opt = np->opt;
732 if (flowlabel)
733 opt = fl6_merge_options(&opt_space, flowlabel, opt);
734 opt = ipv6_fixup_options(&opt_space, opt);
735
736 fl.proto = sk->sk_protocol;
737 ipv6_addr_copy(&fl.fl6_dst, daddr);
738 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
739 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
740 fl.fl_ip_sport = inet->sport;
741
742 /* merge ip6_build_xmit from ip6_output */
743 if (opt && opt->srcrt) {
744 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
745 ipv6_addr_copy(&final, &fl.fl6_dst);
746 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
747 final_p = &final;
748 connected = 0;
749 }
750
751 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
752 fl.oif = np->mcast_oif;
753 connected = 0;
754 }
755
756 security_sk_classify_flow(sk, &fl);
757
758 err = ip6_sk_dst_lookup(sk, &dst, &fl);
759 if (err)
760 goto out;
761 if (final_p)
762 ipv6_addr_copy(&fl.fl6_dst, final_p);
763
764 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
765 if (err == -EREMOTE)
766 err = ip6_dst_blackhole(sk, &dst, &fl);
767 if (err < 0)
768 goto out;
769 }
770
771 if (hlimit < 0) {
772 if (ipv6_addr_is_multicast(&fl.fl6_dst))
773 hlimit = np->mcast_hops;
774 else
775 hlimit = np->hop_limit;
776 if (hlimit < 0)
777 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
778 if (hlimit < 0)
779 hlimit = ipv6_get_hoplimit(dst->dev);
780 }
781
782 if (tclass < 0) {
783 tclass = np->tclass;
784 if (tclass < 0)
785 tclass = 0;
786 }
787
788 if (msg->msg_flags&MSG_CONFIRM)
789 goto do_confirm;
790 back_from_confirm:
791
792 lock_sock(sk);
793 if (unlikely(up->pending)) {
794 /* The socket is already corked while preparing it. */
795 /* ... which is an evident application bug. --ANK */
796 release_sock(sk);
797
798 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
799 err = -EINVAL;
800 goto out;
801 }
802
803 up->pending = AF_INET6;
804
805 do_append_data:
806 up->len += ulen;
807 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
808 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
809 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
810 (struct rt6_info*)dst,
811 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
812 if (err)
813 udp_v6_flush_pending_frames(sk);
814 else if (!corkreq)
815 err = udp_v6_push_pending_frames(sk);
816 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
817 up->pending = 0;
818
819 if (dst) {
820 if (connected) {
821 ip6_dst_store(sk, dst,
822 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
823 &np->daddr : NULL,
824 #ifdef CONFIG_IPV6_SUBTREES
825 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
826 &np->saddr :
827 #endif
828 NULL);
829 } else {
830 dst_release(dst);
831 }
832 }
833
834 if (err > 0)
835 err = np->recverr ? net_xmit_errno(err) : 0;
836 release_sock(sk);
837 out:
838 fl6_sock_release(flowlabel);
839 if (!err) {
840 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
841 return len;
842 }
843 /*
844 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
845 * ENOBUFS might not be good (it's not tunable per se), but otherwise
846 * we don't have a good statistic (IpOutDiscards but it can be too many
847 * things). We could add another new stat but at least for now that
848 * seems like overkill.
849 */
850 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
851 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
852 }
853 return err;
854
855 do_confirm:
856 dst_confirm(dst);
857 if (!(msg->msg_flags&MSG_PROBE) || len)
858 goto back_from_confirm;
859 err = 0;
860 goto out;
861 }
862
863 int udpv6_destroy_sock(struct sock *sk)
864 {
865 lock_sock(sk);
866 udp_v6_flush_pending_frames(sk);
867 release_sock(sk);
868
869 inet6_destroy_sock(sk);
870
871 return 0;
872 }
873
874 /*
875 * Socket option code for UDP
876 */
877 int udpv6_setsockopt(struct sock *sk, int level, int optname,
878 char __user *optval, int optlen)
879 {
880 if (level == SOL_UDP || level == SOL_UDPLITE)
881 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
882 udp_v6_push_pending_frames);
883 return ipv6_setsockopt(sk, level, optname, optval, optlen);
884 }
885
886 #ifdef CONFIG_COMPAT
887 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
888 char __user *optval, int optlen)
889 {
890 if (level == SOL_UDP || level == SOL_UDPLITE)
891 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
892 udp_v6_push_pending_frames);
893 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
894 }
895 #endif
896
897 int udpv6_getsockopt(struct sock *sk, int level, int optname,
898 char __user *optval, int __user *optlen)
899 {
900 if (level == SOL_UDP || level == SOL_UDPLITE)
901 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
902 return ipv6_getsockopt(sk, level, optname, optval, optlen);
903 }
904
905 #ifdef CONFIG_COMPAT
906 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
907 char __user *optval, int __user *optlen)
908 {
909 if (level == SOL_UDP || level == SOL_UDPLITE)
910 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
911 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
912 }
913 #endif
914
915 static struct inet6_protocol udpv6_protocol = {
916 .handler = udpv6_rcv,
917 .err_handler = udpv6_err,
918 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
919 };
920
921 /* ------------------------------------------------------------------------ */
922 #ifdef CONFIG_PROC_FS
923
924 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
925 {
926 struct inet_sock *inet = inet_sk(sp);
927 struct ipv6_pinfo *np = inet6_sk(sp);
928 struct in6_addr *dest, *src;
929 __u16 destp, srcp;
930
931 dest = &np->daddr;
932 src = &np->rcv_saddr;
933 destp = ntohs(inet->dport);
934 srcp = ntohs(inet->sport);
935 seq_printf(seq,
936 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
937 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
938 bucket,
939 src->s6_addr32[0], src->s6_addr32[1],
940 src->s6_addr32[2], src->s6_addr32[3], srcp,
941 dest->s6_addr32[0], dest->s6_addr32[1],
942 dest->s6_addr32[2], dest->s6_addr32[3], destp,
943 sp->sk_state,
944 sk_wmem_alloc_get(sp),
945 sk_rmem_alloc_get(sp),
946 0, 0L, 0,
947 sock_i_uid(sp), 0,
948 sock_i_ino(sp),
949 atomic_read(&sp->sk_refcnt), sp);
950 }
951
952 int udp6_seq_show(struct seq_file *seq, void *v)
953 {
954 if (v == SEQ_START_TOKEN)
955 seq_printf(seq,
956 " sl "
957 "local_address "
958 "remote_address "
959 "st tx_queue rx_queue tr tm->when retrnsmt"
960 " uid timeout inode\n");
961 else
962 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
963 return 0;
964 }
965
966 static struct file_operations udp6_seq_fops;
967 static struct udp_seq_afinfo udp6_seq_afinfo = {
968 .owner = THIS_MODULE,
969 .name = "udp6",
970 .family = AF_INET6,
971 .hashtable = udp_hash,
972 .seq_fops = &udp6_seq_fops,
973 .seq_ops = {
974 .show = udp6_seq_show,
975 },
976 };
977
978 int __init udp6_proc_init(void)
979 {
980 return udp_proc_register(&udp6_seq_afinfo);
981 }
982
983 void udp6_proc_exit(void) {
984 udp_proc_unregister(&udp6_seq_afinfo);
985 }
986 #endif /* CONFIG_PROC_FS */
987
988 /* ------------------------------------------------------------------------ */
989
990 struct proto udpv6_prot = {
991 .name = "UDPv6",
992 .owner = THIS_MODULE,
993 .close = udp_lib_close,
994 .connect = ip6_datagram_connect,
995 .disconnect = udp_disconnect,
996 .ioctl = udp_ioctl,
997 .destroy = udpv6_destroy_sock,
998 .setsockopt = udpv6_setsockopt,
999 .getsockopt = udpv6_getsockopt,
1000 .sendmsg = udpv6_sendmsg,
1001 .recvmsg = udpv6_recvmsg,
1002 .backlog_rcv = udpv6_queue_rcv_skb,
1003 .hash = udp_lib_hash,
1004 .unhash = udp_lib_unhash,
1005 .get_port = udp_v6_get_port,
1006 .obj_size = sizeof(struct udp6_sock),
1007 #ifdef CONFIG_COMPAT
1008 .compat_setsockopt = compat_udpv6_setsockopt,
1009 .compat_getsockopt = compat_udpv6_getsockopt,
1010 #endif
1011 };
1012
1013 static struct inet_protosw udpv6_protosw = {
1014 .type = SOCK_DGRAM,
1015 .protocol = IPPROTO_UDP,
1016 .prot = &udpv6_prot,
1017 .ops = &inet6_dgram_ops,
1018 .capability =-1,
1019 .no_check = UDP_CSUM_DEFAULT,
1020 .flags = INET_PROTOSW_PERMANENT,
1021 };
1022
1023
1024 void __init udpv6_init(void)
1025 {
1026 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1027 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1028 inet6_register_protosw(&udpv6_protosw);
1029 }
Tomato firmware and modifications.