Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / net / ipv6 / udp.c
1 /*
2  *      UDP over IPv6
3  *      Linux INET6 implementation 
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>     
7  *
8  *      Based on linux/ipv4/udp.c
9  *
10  *      $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/sched.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/netdevice.h>
34 #include <linux/if_arp.h>
35 #include <linux/ipv6.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/skbuff.h>
39 #include <asm/uaccess.h>
40
41 #include <net/sock.h>
42 #include <net/snmp.h>
43
44 #include <net/ipv6.h>
45 #include <net/ndisc.h>
46 #include <net/protocol.h>
47 #include <net/transp_v6.h>
48 #include <net/ip6_route.h>
49 #include <net/addrconf.h>
50 #include <net/ip.h>
51 #include <net/udp.h>
52 #include <net/raw.h>
53 #include <net/inet_common.h>
54 #include <net/tcp_states.h>
55
56 #include <net/ip6_checksum.h>
57 #include <net/xfrm.h>
58
59 #include <linux/proc_fs.h>
60 #include <linux/seq_file.h>
61
62 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
63
64 /* Grrr, addr_type already calculated by caller, but I don't want
65  * to add some silly "cookie" argument to this method just for that.
66  */
67 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
68 {
69         struct sock *sk2;
70         struct hlist_node *node;
71
72         write_lock_bh(&udp_hash_lock);
73         if (snum == 0) {
74                 int best_size_so_far, best, result, i;
75
76                 if (udp_port_rover > sysctl_local_port_range[1] ||
77                     udp_port_rover < sysctl_local_port_range[0])
78                         udp_port_rover = sysctl_local_port_range[0];
79                 best_size_so_far = 32767;
80                 best = result = udp_port_rover;
81                 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
82                         int size;
83                         struct hlist_head *list;
84
85                         list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
86                         if (hlist_empty(list)) {
87                                 if (result > sysctl_local_port_range[1])
88                                         result = sysctl_local_port_range[0] +
89                                                 ((result - sysctl_local_port_range[0]) &
90                                                  (UDP_HTABLE_SIZE - 1));
91                                 goto gotit;
92                         }
93                         size = 0;
94                         sk_for_each(sk2, node, list)
95                                 if (++size >= best_size_so_far)
96                                         goto next;
97                         best_size_so_far = size;
98                         best = result;
99                 next:;
100                 }
101                 result = best;
102                 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
103                         if (result > sysctl_local_port_range[1])
104                                 result = sysctl_local_port_range[0]
105                                         + ((result - sysctl_local_port_range[0]) &
106                                            (UDP_HTABLE_SIZE - 1));
107                         if (!udp_lport_inuse(result))
108                                 break;
109                 }
110                 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
111                         goto fail;
112 gotit:
113                 udp_port_rover = snum = result;
114         } else {
115                 sk_for_each(sk2, node,
116                             &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
117                         if (inet_sk(sk2)->num == snum &&
118                             sk2 != sk &&
119                             (!sk2->sk_bound_dev_if ||
120                              !sk->sk_bound_dev_if ||
121                              sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
122                             (!sk2->sk_reuse || !sk->sk_reuse) &&
123                             ipv6_rcv_saddr_equal(sk, sk2))
124                                 goto fail;
125                 }
126         }
127
128         inet_sk(sk)->num = snum;
129         if (sk_unhashed(sk)) {
130                 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
131                 sock_prot_inc_use(sk->sk_prot);
132         }
133         write_unlock_bh(&udp_hash_lock);
134         return 0;
135
136 fail:
137         write_unlock_bh(&udp_hash_lock);
138         return 1;
139 }
140
141 static void udp_v6_hash(struct sock *sk)
142 {
143         BUG();
144 }
145
146 static void udp_v6_unhash(struct sock *sk)
147 {
148         write_lock_bh(&udp_hash_lock);
149         if (sk_del_node_init(sk)) {
150                 inet_sk(sk)->num = 0;
151                 sock_prot_dec_use(sk->sk_prot);
152         }
153         write_unlock_bh(&udp_hash_lock);
154 }
155
156 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
157                                   struct in6_addr *daddr, u16 dport, int dif)
158 {
159         struct sock *sk, *result = NULL;
160         struct hlist_node *node;
161         unsigned short hnum = ntohs(dport);
162         int badness = -1;
163
164         read_lock(&udp_hash_lock);
165         sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
166                 struct inet_sock *inet = inet_sk(sk);
167
168                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
169                         struct ipv6_pinfo *np = inet6_sk(sk);
170                         int score = 0;
171                         if (inet->dport) {
172                                 if (inet->dport != sport)
173                                         continue;
174                                 score++;
175                         }
176                         if (!ipv6_addr_any(&np->rcv_saddr)) {
177                                 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
178                                         continue;
179                                 score++;
180                         }
181                         if (!ipv6_addr_any(&np->daddr)) {
182                                 if (!ipv6_addr_equal(&np->daddr, saddr))
183                                         continue;
184                                 score++;
185                         }
186                         if (sk->sk_bound_dev_if) {
187                                 if (sk->sk_bound_dev_if != dif)
188                                         continue;
189                                 score++;
190                         }
191                         if(score == 4) {
192                                 result = sk;
193                                 break;
194                         } else if(score > badness) {
195                                 result = sk;
196                                 badness = score;
197                         }
198                 }
199         }
200         if (result)
201                 sock_hold(result);
202         read_unlock(&udp_hash_lock);
203         return result;
204 }
205
206 /*
207  *
208  */
209
210 static void udpv6_close(struct sock *sk, long timeout)
211 {
212         sk_common_release(sk);
213 }
214
215 /*
216  *      This should be easy, if there is something there we
217  *      return it, otherwise we block.
218  */
219
220 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 
221                   struct msghdr *msg, size_t len,
222                   int noblock, int flags, int *addr_len)
223 {
224         struct ipv6_pinfo *np = inet6_sk(sk);
225         struct inet_sock *inet = inet_sk(sk);
226         struct sk_buff *skb;
227         size_t copied;
228         int err;
229
230         if (addr_len)
231                 *addr_len=sizeof(struct sockaddr_in6);
232   
233         if (flags & MSG_ERRQUEUE)
234                 return ipv6_recv_error(sk, msg, len);
235
236 try_again:
237         skb = skb_recv_datagram(sk, flags, noblock, &err);
238         if (!skb)
239                 goto out;
240
241         copied = skb->len - sizeof(struct udphdr);
242         if (copied > len) {
243                 copied = len;
244                 msg->msg_flags |= MSG_TRUNC;
245         }
246
247         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
248                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
249                                               copied);
250         } else if (msg->msg_flags&MSG_TRUNC) {
251                 if (__skb_checksum_complete(skb))
252                         goto csum_copy_err;
253                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
254                                               copied);
255         } else {
256                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
257                 if (err == -EINVAL)
258                         goto csum_copy_err;
259         }
260         if (err)
261                 goto out_free;
262
263         sock_recv_timestamp(msg, sk, skb);
264
265         /* Copy the address. */
266         if (msg->msg_name) {
267                 struct sockaddr_in6 *sin6;
268           
269                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
270                 sin6->sin6_family = AF_INET6;
271                 sin6->sin6_port = skb->h.uh->source;
272                 sin6->sin6_flowinfo = 0;
273                 sin6->sin6_scope_id = 0;
274
275                 if (skb->protocol == htons(ETH_P_IP))
276                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
277                                       htonl(0xffff), skb->nh.iph->saddr);
278                 else {
279                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
280                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
281                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
282                 }
283
284         }
285         if (skb->protocol == htons(ETH_P_IP)) {
286                 if (inet->cmsg_flags)
287                         ip_cmsg_recv(msg, skb);
288         } else {
289                 if (np->rxopt.all)
290                         datagram_recv_ctl(sk, msg, skb);
291         }
292
293         err = copied;
294         if (flags & MSG_TRUNC)
295                 err = skb->len - sizeof(struct udphdr);
296
297 out_free:
298         skb_free_datagram(sk, skb);
299 out:
300         return err;
301
302 csum_copy_err:
303         skb_kill_datagram(sk, skb, flags);
304
305         if (flags & MSG_DONTWAIT) {
306                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
307                 return -EAGAIN;
308         }
309         goto try_again;
310 }
311
312 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
313                int type, int code, int offset, __u32 info)
314 {
315         struct ipv6_pinfo *np;
316         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
317         struct net_device *dev = skb->dev;
318         struct in6_addr *saddr = &hdr->saddr;
319         struct in6_addr *daddr = &hdr->daddr;
320         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
321         struct sock *sk;
322         int err;
323
324         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
325    
326         if (sk == NULL)
327                 return;
328
329         np = inet6_sk(sk);
330
331         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
332                 goto out;
333
334         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
335                 goto out;
336
337         if (np->recverr)
338                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
339
340         sk->sk_err = err;
341         sk->sk_error_report(sk);
342 out:
343         sock_put(sk);
344 }
345
346 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
347 {
348         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
349                 kfree_skb(skb);
350                 return -1;
351         }
352
353         if (skb_checksum_complete(skb)) {
354                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
355                 kfree_skb(skb);
356                 return 0;
357         }
358
359         if (sock_queue_rcv_skb(sk,skb)<0) {
360                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
361                 kfree_skb(skb);
362                 return 0;
363         }
364         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
365         return 0;
366 }
367
368 static struct sock *udp_v6_mcast_next(struct sock *sk,
369                                       u16 loc_port, struct in6_addr *loc_addr,
370                                       u16 rmt_port, struct in6_addr *rmt_addr,
371                                       int dif)
372 {
373         struct hlist_node *node;
374         struct sock *s = sk;
375         unsigned short num = ntohs(loc_port);
376
377         sk_for_each_from(s, node) {
378                 struct inet_sock *inet = inet_sk(s);
379
380                 if (inet->num == num && s->sk_family == PF_INET6) {
381                         struct ipv6_pinfo *np = inet6_sk(s);
382                         if (inet->dport) {
383                                 if (inet->dport != rmt_port)
384                                         continue;
385                         }
386                         if (!ipv6_addr_any(&np->daddr) &&
387                             !ipv6_addr_equal(&np->daddr, rmt_addr))
388                                 continue;
389
390                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
391                                 continue;
392
393                         if (!ipv6_addr_any(&np->rcv_saddr)) {
394                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
395                                         continue;
396                         }
397                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
398                                 continue;
399                         return s;
400                 }
401         }
402         return NULL;
403 }
404
405 /*
406  * Note: called only from the BH handler context,
407  * so we don't need to lock the hashes.
408  */
409 static void udpv6_mcast_deliver(struct udphdr *uh,
410                                 struct in6_addr *saddr, struct in6_addr *daddr,
411                                 struct sk_buff *skb)
412 {
413         struct sock *sk, *sk2;
414         int dif;
415
416         read_lock(&udp_hash_lock);
417         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
418         dif = skb->dev->ifindex;
419         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
420         if (!sk) {
421                 kfree_skb(skb);
422                 goto out;
423         }
424
425         sk2 = sk;
426         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
427                                         uh->source, saddr, dif))) {
428                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
429                 if (buff)
430                         udpv6_queue_rcv_skb(sk2, buff);
431         }
432         udpv6_queue_rcv_skb(sk, skb);
433 out:
434         read_unlock(&udp_hash_lock);
435 }
436
437 static int udpv6_rcv(struct sk_buff **pskb)
438 {
439         struct sk_buff *skb = *pskb;
440         struct sock *sk;
441         struct udphdr *uh;
442         struct net_device *dev = skb->dev;
443         struct in6_addr *saddr, *daddr;
444         u32 ulen = 0;
445
446         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
447                 goto short_packet;
448
449         saddr = &skb->nh.ipv6h->saddr;
450         daddr = &skb->nh.ipv6h->daddr;
451         uh = skb->h.uh;
452
453         ulen = ntohs(uh->len);
454
455         /* Check for jumbo payload */
456         if (ulen == 0)
457                 ulen = skb->len;
458
459         if (ulen > skb->len || ulen < sizeof(*uh))
460                 goto short_packet;
461
462         if (uh->check == 0) {
463                 /* RFC 2460 section 8.1 says that we SHOULD log
464                    this error. Well, it is reasonable.
465                  */
466                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
467                 goto discard;
468         }
469
470         if (ulen < skb->len) {
471                 if (pskb_trim_rcsum(skb, ulen))
472                         goto discard;
473                 saddr = &skb->nh.ipv6h->saddr;
474                 daddr = &skb->nh.ipv6h->daddr;
475                 uh = skb->h.uh;
476         }
477
478         if (skb->ip_summed == CHECKSUM_HW &&
479             !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
480                 skb->ip_summed = CHECKSUM_UNNECESSARY;
481
482         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
483                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
484
485         /* 
486          *      Multicast receive code 
487          */
488         if (ipv6_addr_is_multicast(daddr)) {
489                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
490                 return 0;
491         }
492
493         /* Unicast */
494
495         /* 
496          * check socket cache ... must talk to Alan about his plans
497          * for sock caches... i'll skip this for now.
498          */
499         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
500
501         if (sk == NULL) {
502                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
503                         goto discard;
504
505                 if (skb_checksum_complete(skb))
506                         goto discard;
507                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
508
509                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
510
511                 kfree_skb(skb);
512                 return(0);
513         }
514         
515         /* deliver */
516         
517         udpv6_queue_rcv_skb(sk, skb);
518         sock_put(sk);
519         return(0);
520
521 short_packet:   
522         if (net_ratelimit())
523                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
524
525 discard:
526         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
527         kfree_skb(skb);
528         return(0);      
529 }
530 /*
531  * Throw away all pending data and cancel the corking. Socket is locked.
532  */
533 static void udp_v6_flush_pending_frames(struct sock *sk)
534 {
535         struct udp_sock *up = udp_sk(sk);
536
537         if (up->pending) {
538                 up->len = 0;
539                 up->pending = 0;
540                 ip6_flush_pending_frames(sk);
541         }
542 }
543
544 /*
545  *      Sending
546  */
547
548 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
549 {
550         struct sk_buff *skb;
551         struct udphdr *uh;
552         struct inet_sock *inet = inet_sk(sk);
553         struct flowi *fl = &inet->cork.fl;
554         int err = 0;
555
556         /* Grab the skbuff where UDP header space exists. */
557         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
558                 goto out;
559
560         /*
561          * Create a UDP header
562          */
563         uh = skb->h.uh;
564         uh->source = fl->fl_ip_sport;
565         uh->dest = fl->fl_ip_dport;
566         uh->len = htons(up->len);
567         uh->check = 0;
568
569         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
570                 skb->ip_summed = CHECKSUM_NONE;
571                 goto send;
572         }
573
574         if (skb_queue_len(&sk->sk_write_queue) == 1) {
575                 skb->csum = csum_partial((char *)uh,
576                                 sizeof(struct udphdr), skb->csum);
577                 uh->check = csum_ipv6_magic(&fl->fl6_src,
578                                             &fl->fl6_dst,
579                                             up->len, fl->proto, skb->csum);
580         } else {
581                 u32 tmp_csum = 0;
582
583                 skb_queue_walk(&sk->sk_write_queue, skb) {
584                         tmp_csum = csum_add(tmp_csum, skb->csum);
585                 }
586                 tmp_csum = csum_partial((char *)uh,
587                                 sizeof(struct udphdr), tmp_csum);
588                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
589                                            &fl->fl6_dst,
590                                            up->len, fl->proto, tmp_csum);
591                 uh->check = tmp_csum;
592
593         }
594         if (uh->check == 0)
595                 uh->check = -1;
596
597 send:
598         err = ip6_push_pending_frames(sk);
599 out:
600         up->len = 0;
601         up->pending = 0;
602         return err;
603 }
604
605 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 
606                   struct msghdr *msg, size_t len)
607 {
608         struct ipv6_txoptions opt_space;
609         struct udp_sock *up = udp_sk(sk);
610         struct inet_sock *inet = inet_sk(sk);
611         struct ipv6_pinfo *np = inet6_sk(sk);
612         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
613         struct in6_addr *daddr, *final_p = NULL, final;
614         struct ipv6_txoptions *opt = NULL;
615         struct ip6_flowlabel *flowlabel = NULL;
616         struct flowi *fl = &inet->cork.fl;
617         struct dst_entry *dst;
618         int addr_len = msg->msg_namelen;
619         int ulen = len;
620         int hlimit = -1;
621         int tclass = -1;
622         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
623         int err;
624         int connected = 0;
625
626         /* destination address check */
627         if (sin6) {
628                 if (addr_len < offsetof(struct sockaddr, sa_data))
629                         return -EINVAL;
630
631                 switch (sin6->sin6_family) {
632                 case AF_INET6:
633                         if (addr_len < SIN6_LEN_RFC2133)
634                                 return -EINVAL;
635                         daddr = &sin6->sin6_addr;
636                         break;
637                 case AF_INET:
638                         goto do_udp_sendmsg;
639                 case AF_UNSPEC:
640                         msg->msg_name = sin6 = NULL;
641                         msg->msg_namelen = addr_len = 0;
642                         daddr = NULL;
643                         break;
644                 default:
645                         return -EINVAL;
646                 }
647         } else if (!up->pending) {
648                 if (sk->sk_state != TCP_ESTABLISHED)
649                         return -EDESTADDRREQ;
650                 daddr = &np->daddr;
651         } else 
652                 daddr = NULL;
653
654         if (daddr) {
655                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
656                         struct sockaddr_in sin;
657                         sin.sin_family = AF_INET;
658                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
659                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
660                         msg->msg_name = &sin;
661                         msg->msg_namelen = sizeof(sin);
662 do_udp_sendmsg:
663                         if (__ipv6_only_sock(sk))
664                                 return -ENETUNREACH;
665                         return udp_sendmsg(iocb, sk, msg, len);
666                 }
667         }
668
669         if (up->pending == AF_INET)
670                 return udp_sendmsg(iocb, sk, msg, len);
671
672         /* Rough check on arithmetic overflow,
673            better check is made in ip6_build_xmit
674            */
675         if (len > INT_MAX - sizeof(struct udphdr))
676                 return -EMSGSIZE;
677         
678         if (up->pending) {
679                 /*
680                  * There are pending frames.
681                  * The socket lock must be held while it's corked.
682                  */
683                 lock_sock(sk);
684                 if (likely(up->pending)) {
685                         if (unlikely(up->pending != AF_INET6)) {
686                                 release_sock(sk);
687                                 return -EAFNOSUPPORT;
688                         }
689                         dst = NULL;
690                         goto do_append_data;
691                 }
692                 release_sock(sk);
693         }
694         ulen += sizeof(struct udphdr);
695
696         memset(fl, 0, sizeof(*fl));
697
698         if (sin6) {
699                 if (sin6->sin6_port == 0)
700                         return -EINVAL;
701
702                 fl->fl_ip_dport = sin6->sin6_port;
703                 daddr = &sin6->sin6_addr;
704
705                 if (np->sndflow) {
706                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
707                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
708                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
709                                 if (flowlabel == NULL)
710                                         return -EINVAL;
711                                 daddr = &flowlabel->dst;
712                         }
713                 }
714
715                 /*
716                  * Otherwise it will be difficult to maintain
717                  * sk->sk_dst_cache.
718                  */
719                 if (sk->sk_state == TCP_ESTABLISHED &&
720                     ipv6_addr_equal(daddr, &np->daddr))
721                         daddr = &np->daddr;
722
723                 if (addr_len >= sizeof(struct sockaddr_in6) &&
724                     sin6->sin6_scope_id &&
725                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
726                         fl->oif = sin6->sin6_scope_id;
727         } else {
728                 if (sk->sk_state != TCP_ESTABLISHED)
729                         return -EDESTADDRREQ;
730
731                 fl->fl_ip_dport = inet->dport;
732                 daddr = &np->daddr;
733                 fl->fl6_flowlabel = np->flow_label;
734                 connected = 1;
735         }
736
737         if (!fl->oif)
738                 fl->oif = sk->sk_bound_dev_if;
739
740         if (msg->msg_controllen) {
741                 opt = &opt_space;
742                 memset(opt, 0, sizeof(struct ipv6_txoptions));
743                 opt->tot_len = sizeof(*opt);
744
745                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
746                 if (err < 0) {
747                         fl6_sock_release(flowlabel);
748                         return err;
749                 }
750                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
751                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
752                         if (flowlabel == NULL)
753                                 return -EINVAL;
754                 }
755                 if (!(opt->opt_nflen|opt->opt_flen))
756                         opt = NULL;
757                 connected = 0;
758         }
759         if (opt == NULL)
760                 opt = np->opt;
761         if (flowlabel)
762                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
763         opt = ipv6_fixup_options(&opt_space, opt);
764
765         fl->proto = IPPROTO_UDP;
766         ipv6_addr_copy(&fl->fl6_dst, daddr);
767         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
768                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
769         fl->fl_ip_sport = inet->sport;
770         
771         /* merge ip6_build_xmit from ip6_output */
772         if (opt && opt->srcrt) {
773                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
774                 ipv6_addr_copy(&final, &fl->fl6_dst);
775                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
776                 final_p = &final;
777                 connected = 0;
778         }
779
780         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
781                 fl->oif = np->mcast_oif;
782                 connected = 0;
783         }
784
785         err = ip6_dst_lookup(sk, &dst, fl);
786         if (err)
787                 goto out;
788         if (final_p)
789                 ipv6_addr_copy(&fl->fl6_dst, final_p);
790
791         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
792                 goto out;
793
794         if (hlimit < 0) {
795                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
796                         hlimit = np->mcast_hops;
797                 else
798                         hlimit = np->hop_limit;
799                 if (hlimit < 0)
800                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
801                 if (hlimit < 0)
802                         hlimit = ipv6_get_hoplimit(dst->dev);
803         }
804
805         if (tclass < 0) {
806                 tclass = np->tclass;
807                 if (tclass < 0)
808                         tclass = 0;
809         }
810
811         if (msg->msg_flags&MSG_CONFIRM)
812                 goto do_confirm;
813 back_from_confirm:
814
815         lock_sock(sk);
816         if (unlikely(up->pending)) {
817                 /* The socket is already corked while preparing it. */
818                 /* ... which is an evident application bug. --ANK */
819                 release_sock(sk);
820
821                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
822                 err = -EINVAL;
823                 goto out;
824         }
825
826         up->pending = AF_INET6;
827
828 do_append_data:
829         up->len += ulen;
830         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
831                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
832                 (struct rt6_info*)dst,
833                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
834         if (err)
835                 udp_v6_flush_pending_frames(sk);
836         else if (!corkreq)
837                 err = udp_v6_push_pending_frames(sk, up);
838
839         if (dst) {
840                 if (connected) {
841                         ip6_dst_store(sk, dst,
842                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
843                                       &np->daddr : NULL);
844                 } else {
845                         dst_release(dst);
846                 }
847         }
848
849         if (err > 0)
850                 err = np->recverr ? net_xmit_errno(err) : 0;
851         release_sock(sk);
852 out:
853         fl6_sock_release(flowlabel);
854         if (!err) {
855                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
856                 return len;
857         }
858         return err;
859
860 do_confirm:
861         dst_confirm(dst);
862         if (!(msg->msg_flags&MSG_PROBE) || len)
863                 goto back_from_confirm;
864         err = 0;
865         goto out;
866 }
867
868 static int udpv6_destroy_sock(struct sock *sk)
869 {
870         lock_sock(sk);
871         udp_v6_flush_pending_frames(sk);
872         release_sock(sk);
873
874         inet6_destroy_sock(sk);
875
876         return 0;
877 }
878
879 /*
880  *      Socket option code for UDP
881  */
882 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
883                           char __user *optval, int optlen)
884 {
885         struct udp_sock *up = udp_sk(sk);
886         int val;
887         int err = 0;
888
889         if(optlen<sizeof(int))
890                 return -EINVAL;
891
892         if (get_user(val, (int __user *)optval))
893                 return -EFAULT;
894
895         switch(optname) {
896         case UDP_CORK:
897                 if (val != 0) {
898                         up->corkflag = 1;
899                 } else {
900                         up->corkflag = 0;
901                         lock_sock(sk);
902                         udp_v6_push_pending_frames(sk, up);
903                         release_sock(sk);
904                 }
905                 break;
906                 
907         case UDP_ENCAP:
908                 switch (val) {
909                 case 0:
910                         up->encap_type = val;
911                         break;
912                 default:
913                         err = -ENOPROTOOPT;
914                         break;
915                 }
916                 break;
917
918         default:
919                 err = -ENOPROTOOPT;
920                 break;
921         };
922
923         return err;
924 }
925
926 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
927                           char __user *optval, int optlen)
928 {
929         if (level != SOL_UDP)
930                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
931         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
932 }
933
934 #ifdef CONFIG_COMPAT
935 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
936                                    char __user *optval, int optlen)
937 {
938         if (level != SOL_UDP)
939                 return compat_ipv6_setsockopt(sk, level, optname,
940                                               optval, optlen);
941         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
942 }
943 #endif
944
945 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
946                           char __user *optval, int __user *optlen)
947 {
948         struct udp_sock *up = udp_sk(sk);
949         int val, len;
950
951         if(get_user(len,optlen))
952                 return -EFAULT;
953
954         len = min_t(unsigned int, len, sizeof(int));
955         
956         if(len < 0)
957                 return -EINVAL;
958
959         switch(optname) {
960         case UDP_CORK:
961                 val = up->corkflag;
962                 break;
963
964         case UDP_ENCAP:
965                 val = up->encap_type;
966                 break;
967
968         default:
969                 return -ENOPROTOOPT;
970         };
971
972         if(put_user(len, optlen))
973                 return -EFAULT;
974         if(copy_to_user(optval, &val,len))
975                 return -EFAULT;
976         return 0;
977 }
978
979 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
980                           char __user *optval, int __user *optlen)
981 {
982         if (level != SOL_UDP)
983                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
984         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
985 }
986
987 #ifdef CONFIG_COMPAT
988 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
989                                    char __user *optval, int __user *optlen)
990 {
991         if (level != SOL_UDP)
992                 return compat_ipv6_getsockopt(sk, level, optname,
993                                               optval, optlen);
994         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
995 }
996 #endif
997
998 static struct inet6_protocol udpv6_protocol = {
999         .handler        =       udpv6_rcv,
1000         .err_handler    =       udpv6_err,
1001         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1002 };
1003
1004 /* ------------------------------------------------------------------------ */
1005 #ifdef CONFIG_PROC_FS
1006
1007 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1008 {
1009         struct inet_sock *inet = inet_sk(sp);
1010         struct ipv6_pinfo *np = inet6_sk(sp);
1011         struct in6_addr *dest, *src;
1012         __u16 destp, srcp;
1013
1014         dest  = &np->daddr;
1015         src   = &np->rcv_saddr;
1016         destp = ntohs(inet->dport);
1017         srcp  = ntohs(inet->sport);
1018         seq_printf(seq,
1019                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1020                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1021                    bucket,
1022                    src->s6_addr32[0], src->s6_addr32[1],
1023                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1024                    dest->s6_addr32[0], dest->s6_addr32[1],
1025                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1026                    sp->sk_state, 
1027                    atomic_read(&sp->sk_wmem_alloc),
1028                    atomic_read(&sp->sk_rmem_alloc),
1029                    0, 0L, 0,
1030                    sock_i_uid(sp), 0,
1031                    sock_i_ino(sp),
1032                    atomic_read(&sp->sk_refcnt), sp);
1033 }
1034
1035 static int udp6_seq_show(struct seq_file *seq, void *v)
1036 {
1037         if (v == SEQ_START_TOKEN)
1038                 seq_printf(seq,
1039                            "  sl  "
1040                            "local_address                         "
1041                            "remote_address                        "
1042                            "st tx_queue rx_queue tr tm->when retrnsmt"
1043                            "   uid  timeout inode\n");
1044         else
1045                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1046         return 0;
1047 }
1048
1049 static struct file_operations udp6_seq_fops;
1050 static struct udp_seq_afinfo udp6_seq_afinfo = {
1051         .owner          = THIS_MODULE,
1052         .name           = "udp6",
1053         .family         = AF_INET6,
1054         .seq_show       = udp6_seq_show,
1055         .seq_fops       = &udp6_seq_fops,
1056 };
1057
1058 int __init udp6_proc_init(void)
1059 {
1060         return udp_proc_register(&udp6_seq_afinfo);
1061 }
1062
1063 void udp6_proc_exit(void) {
1064         udp_proc_unregister(&udp6_seq_afinfo);
1065 }
1066 #endif /* CONFIG_PROC_FS */
1067
1068 /* ------------------------------------------------------------------------ */
1069
1070 struct proto udpv6_prot = {
1071         .name              = "UDPv6",
1072         .owner             = THIS_MODULE,
1073         .close             = udpv6_close,
1074         .connect           = ip6_datagram_connect,
1075         .disconnect        = udp_disconnect,
1076         .ioctl             = udp_ioctl,
1077         .destroy           = udpv6_destroy_sock,
1078         .setsockopt        = udpv6_setsockopt,
1079         .getsockopt        = udpv6_getsockopt,
1080         .sendmsg           = udpv6_sendmsg,
1081         .recvmsg           = udpv6_recvmsg,
1082         .backlog_rcv       = udpv6_queue_rcv_skb,
1083         .hash              = udp_v6_hash,
1084         .unhash            = udp_v6_unhash,
1085         .get_port          = udp_v6_get_port,
1086         .obj_size          = sizeof(struct udp6_sock),
1087 #ifdef CONFIG_COMPAT
1088         .compat_setsockopt = compat_udpv6_setsockopt,
1089         .compat_getsockopt = compat_udpv6_getsockopt,
1090 #endif
1091 };
1092
1093 static struct inet_protosw udpv6_protosw = {
1094         .type =      SOCK_DGRAM,
1095         .protocol =  IPPROTO_UDP,
1096         .prot =      &udpv6_prot,
1097         .ops =       &inet6_dgram_ops,
1098         .capability =-1,
1099         .no_check =  UDP_CSUM_DEFAULT,
1100         .flags =     INET_PROTOSW_PERMANENT,
1101 };
1102
1103
1104 void __init udpv6_init(void)
1105 {
1106         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1107                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1108         inet6_register_protosw(&udpv6_protosw);
1109 }