[NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
[linux-2.6.git] / 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/config.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/sched.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/ipv6.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <linux/skbuff.h>
40 #include <asm/uaccess.h>
41
42 #include <net/sock.h>
43 #include <net/snmp.h>
44
45 #include <net/ipv6.h>
46 #include <net/ndisc.h>
47 #include <net/protocol.h>
48 #include <net/transp_v6.h>
49 #include <net/ip6_route.h>
50 #include <net/addrconf.h>
51 #include <net/ip.h>
52 #include <net/udp.h>
53 #include <net/raw.h>
54 #include <net/inet_common.h>
55 #include <net/tcp_states.h>
56
57 #include <net/ip6_checksum.h>
58 #include <net/xfrm.h>
59
60 #include <linux/proc_fs.h>
61 #include <linux/seq_file.h>
62
63 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
64
65 /* Grrr, addr_type already calculated by caller, but I don't want
66  * to add some silly "cookie" argument to this method just for that.
67  */
68 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
69 {
70         struct sock *sk2;
71         struct hlist_node *node;
72
73         write_lock_bh(&udp_hash_lock);
74         if (snum == 0) {
75                 int best_size_so_far, best, result, i;
76
77                 if (udp_port_rover > sysctl_local_port_range[1] ||
78                     udp_port_rover < sysctl_local_port_range[0])
79                         udp_port_rover = sysctl_local_port_range[0];
80                 best_size_so_far = 32767;
81                 best = result = udp_port_rover;
82                 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
83                         int size;
84                         struct hlist_head *list;
85
86                         list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
87                         if (hlist_empty(list)) {
88                                 if (result > sysctl_local_port_range[1])
89                                         result = sysctl_local_port_range[0] +
90                                                 ((result - sysctl_local_port_range[0]) &
91                                                  (UDP_HTABLE_SIZE - 1));
92                                 goto gotit;
93                         }
94                         size = 0;
95                         sk_for_each(sk2, node, list)
96                                 if (++size >= best_size_so_far)
97                                         goto next;
98                         best_size_so_far = size;
99                         best = result;
100                 next:;
101                 }
102                 result = best;
103                 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
104                         if (result > sysctl_local_port_range[1])
105                                 result = sysctl_local_port_range[0]
106                                         + ((result - sysctl_local_port_range[0]) &
107                                            (UDP_HTABLE_SIZE - 1));
108                         if (!udp_lport_inuse(result))
109                                 break;
110                 }
111                 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
112                         goto fail;
113 gotit:
114                 udp_port_rover = snum = result;
115         } else {
116                 sk_for_each(sk2, node,
117                             &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
118                         if (inet_sk(sk2)->num == snum &&
119                             sk2 != sk &&
120                             (!sk2->sk_bound_dev_if ||
121                              !sk->sk_bound_dev_if ||
122                              sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
123                             (!sk2->sk_reuse || !sk->sk_reuse) &&
124                             ipv6_rcv_saddr_equal(sk, sk2))
125                                 goto fail;
126                 }
127         }
128
129         inet_sk(sk)->num = snum;
130         if (sk_unhashed(sk)) {
131                 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
132                 sock_prot_inc_use(sk->sk_prot);
133         }
134         write_unlock_bh(&udp_hash_lock);
135         return 0;
136
137 fail:
138         write_unlock_bh(&udp_hash_lock);
139         return 1;
140 }
141
142 static void udp_v6_hash(struct sock *sk)
143 {
144         BUG();
145 }
146
147 static void udp_v6_unhash(struct sock *sk)
148 {
149         write_lock_bh(&udp_hash_lock);
150         if (sk_del_node_init(sk)) {
151                 inet_sk(sk)->num = 0;
152                 sock_prot_dec_use(sk->sk_prot);
153         }
154         write_unlock_bh(&udp_hash_lock);
155 }
156
157 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
158                                   struct in6_addr *daddr, u16 dport, int dif)
159 {
160         struct sock *sk, *result = NULL;
161         struct hlist_node *node;
162         unsigned short hnum = ntohs(dport);
163         int badness = -1;
164
165         read_lock(&udp_hash_lock);
166         sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
167                 struct inet_sock *inet = inet_sk(sk);
168
169                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
170                         struct ipv6_pinfo *np = inet6_sk(sk);
171                         int score = 0;
172                         if (inet->dport) {
173                                 if (inet->dport != sport)
174                                         continue;
175                                 score++;
176                         }
177                         if (!ipv6_addr_any(&np->rcv_saddr)) {
178                                 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
179                                         continue;
180                                 score++;
181                         }
182                         if (!ipv6_addr_any(&np->daddr)) {
183                                 if (!ipv6_addr_equal(&np->daddr, saddr))
184                                         continue;
185                                 score++;
186                         }
187                         if (sk->sk_bound_dev_if) {
188                                 if (sk->sk_bound_dev_if != dif)
189                                         continue;
190                                 score++;
191                         }
192                         if(score == 4) {
193                                 result = sk;
194                                 break;
195                         } else if(score > badness) {
196                                 result = sk;
197                                 badness = score;
198                         }
199                 }
200         }
201         if (result)
202                 sock_hold(result);
203         read_unlock(&udp_hash_lock);
204         return result;
205 }
206
207 /*
208  *
209  */
210
211 static void udpv6_close(struct sock *sk, long timeout)
212 {
213         sk_common_release(sk);
214 }
215
216 /*
217  *      This should be easy, if there is something there we
218  *      return it, otherwise we block.
219  */
220
221 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 
222                   struct msghdr *msg, size_t len,
223                   int noblock, int flags, int *addr_len)
224 {
225         struct ipv6_pinfo *np = inet6_sk(sk);
226         struct inet_sock *inet = inet_sk(sk);
227         struct sk_buff *skb;
228         size_t copied;
229         int err;
230
231         if (addr_len)
232                 *addr_len=sizeof(struct sockaddr_in6);
233   
234         if (flags & MSG_ERRQUEUE)
235                 return ipv6_recv_error(sk, msg, len);
236
237 try_again:
238         skb = skb_recv_datagram(sk, flags, noblock, &err);
239         if (!skb)
240                 goto out;
241
242         copied = skb->len - sizeof(struct udphdr);
243         if (copied > len) {
244                 copied = len;
245                 msg->msg_flags |= MSG_TRUNC;
246         }
247
248         if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
249                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
250                                               copied);
251         } else if (msg->msg_flags&MSG_TRUNC) {
252                 if (__skb_checksum_complete(skb))
253                         goto csum_copy_err;
254                 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
255                                               copied);
256         } else {
257                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
258                 if (err == -EINVAL)
259                         goto csum_copy_err;
260         }
261         if (err)
262                 goto out_free;
263
264         sock_recv_timestamp(msg, sk, skb);
265
266         /* Copy the address. */
267         if (msg->msg_name) {
268                 struct sockaddr_in6 *sin6;
269           
270                 sin6 = (struct sockaddr_in6 *) msg->msg_name;
271                 sin6->sin6_family = AF_INET6;
272                 sin6->sin6_port = skb->h.uh->source;
273                 sin6->sin6_flowinfo = 0;
274                 sin6->sin6_scope_id = 0;
275
276                 if (skb->protocol == htons(ETH_P_IP))
277                         ipv6_addr_set(&sin6->sin6_addr, 0, 0,
278                                       htonl(0xffff), skb->nh.iph->saddr);
279                 else {
280                         ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
281                         if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
282                                 sin6->sin6_scope_id = IP6CB(skb)->iif;
283                 }
284
285         }
286         if (skb->protocol == htons(ETH_P_IP)) {
287                 if (inet->cmsg_flags)
288                         ip_cmsg_recv(msg, skb);
289         } else {
290                 if (np->rxopt.all)
291                         datagram_recv_ctl(sk, msg, skb);
292         }
293
294         err = copied;
295         if (flags & MSG_TRUNC)
296                 err = skb->len - sizeof(struct udphdr);
297
298 out_free:
299         skb_free_datagram(sk, skb);
300 out:
301         return err;
302
303 csum_copy_err:
304         skb_kill_datagram(sk, skb, flags);
305
306         if (flags & MSG_DONTWAIT) {
307                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
308                 return -EAGAIN;
309         }
310         goto try_again;
311 }
312
313 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
314                int type, int code, int offset, __u32 info)
315 {
316         struct ipv6_pinfo *np;
317         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
318         struct net_device *dev = skb->dev;
319         struct in6_addr *saddr = &hdr->saddr;
320         struct in6_addr *daddr = &hdr->daddr;
321         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
322         struct sock *sk;
323         int err;
324
325         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
326    
327         if (sk == NULL)
328                 return;
329
330         np = inet6_sk(sk);
331
332         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
333                 goto out;
334
335         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
336                 goto out;
337
338         if (np->recverr)
339                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
340
341         sk->sk_err = err;
342         sk->sk_error_report(sk);
343 out:
344         sock_put(sk);
345 }
346
347 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
348 {
349         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
350                 kfree_skb(skb);
351                 return -1;
352         }
353
354         if (skb_checksum_complete(skb)) {
355                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
356                 kfree_skb(skb);
357                 return 0;
358         }
359
360         if (sock_queue_rcv_skb(sk,skb)<0) {
361                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
362                 kfree_skb(skb);
363                 return 0;
364         }
365         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
366         return 0;
367 }
368
369 static struct sock *udp_v6_mcast_next(struct sock *sk,
370                                       u16 loc_port, struct in6_addr *loc_addr,
371                                       u16 rmt_port, struct in6_addr *rmt_addr,
372                                       int dif)
373 {
374         struct hlist_node *node;
375         struct sock *s = sk;
376         unsigned short num = ntohs(loc_port);
377
378         sk_for_each_from(s, node) {
379                 struct inet_sock *inet = inet_sk(s);
380
381                 if (inet->num == num && s->sk_family == PF_INET6) {
382                         struct ipv6_pinfo *np = inet6_sk(s);
383                         if (inet->dport) {
384                                 if (inet->dport != rmt_port)
385                                         continue;
386                         }
387                         if (!ipv6_addr_any(&np->daddr) &&
388                             !ipv6_addr_equal(&np->daddr, rmt_addr))
389                                 continue;
390
391                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
392                                 continue;
393
394                         if (!ipv6_addr_any(&np->rcv_saddr)) {
395                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
396                                         continue;
397                         }
398                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
399                                 continue;
400                         return s;
401                 }
402         }
403         return NULL;
404 }
405
406 /*
407  * Note: called only from the BH handler context,
408  * so we don't need to lock the hashes.
409  */
410 static void udpv6_mcast_deliver(struct udphdr *uh,
411                                 struct in6_addr *saddr, struct in6_addr *daddr,
412                                 struct sk_buff *skb)
413 {
414         struct sock *sk, *sk2;
415         int dif;
416
417         read_lock(&udp_hash_lock);
418         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
419         dif = skb->dev->ifindex;
420         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
421         if (!sk) {
422                 kfree_skb(skb);
423                 goto out;
424         }
425
426         sk2 = sk;
427         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
428                                         uh->source, saddr, dif))) {
429                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
430                 if (buff)
431                         udpv6_queue_rcv_skb(sk2, buff);
432         }
433         udpv6_queue_rcv_skb(sk, skb);
434 out:
435         read_unlock(&udp_hash_lock);
436 }
437
438 static int udpv6_rcv(struct sk_buff **pskb)
439 {
440         struct sk_buff *skb = *pskb;
441         struct sock *sk;
442         struct udphdr *uh;
443         struct net_device *dev = skb->dev;
444         struct in6_addr *saddr, *daddr;
445         u32 ulen = 0;
446
447         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
448                 goto short_packet;
449
450         saddr = &skb->nh.ipv6h->saddr;
451         daddr = &skb->nh.ipv6h->daddr;
452         uh = skb->h.uh;
453
454         ulen = ntohs(uh->len);
455
456         /* Check for jumbo payload */
457         if (ulen == 0)
458                 ulen = skb->len;
459
460         if (ulen > skb->len || ulen < sizeof(*uh))
461                 goto short_packet;
462
463         if (uh->check == 0) {
464                 /* RFC 2460 section 8.1 says that we SHOULD log
465                    this error. Well, it is reasonable.
466                  */
467                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
468                 goto discard;
469         }
470
471         if (ulen < skb->len) {
472                 if (pskb_trim_rcsum(skb, ulen))
473                         goto discard;
474                 saddr = &skb->nh.ipv6h->saddr;
475                 daddr = &skb->nh.ipv6h->daddr;
476                 uh = skb->h.uh;
477         }
478
479         if (skb->ip_summed == CHECKSUM_HW &&
480             !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
481                 skb->ip_summed = CHECKSUM_UNNECESSARY;
482
483         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
484                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
485
486         /* 
487          *      Multicast receive code 
488          */
489         if (ipv6_addr_is_multicast(daddr)) {
490                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
491                 return 0;
492         }
493
494         /* Unicast */
495
496         /* 
497          * check socket cache ... must talk to Alan about his plans
498          * for sock caches... i'll skip this for now.
499          */
500         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
501
502         if (sk == NULL) {
503                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
504                         goto discard;
505
506                 if (skb_checksum_complete(skb))
507                         goto discard;
508                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
509
510                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
511
512                 kfree_skb(skb);
513                 return(0);
514         }
515         
516         /* deliver */
517         
518         udpv6_queue_rcv_skb(sk, skb);
519         sock_put(sk);
520         return(0);
521
522 short_packet:   
523         if (net_ratelimit())
524                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
525
526 discard:
527         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
528         kfree_skb(skb);
529         return(0);      
530 }
531 /*
532  * Throw away all pending data and cancel the corking. Socket is locked.
533  */
534 static void udp_v6_flush_pending_frames(struct sock *sk)
535 {
536         struct udp_sock *up = udp_sk(sk);
537
538         if (up->pending) {
539                 up->len = 0;
540                 up->pending = 0;
541                 ip6_flush_pending_frames(sk);
542         }
543 }
544
545 /*
546  *      Sending
547  */
548
549 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
550 {
551         struct sk_buff *skb;
552         struct udphdr *uh;
553         struct inet_sock *inet = inet_sk(sk);
554         struct flowi *fl = &inet->cork.fl;
555         int err = 0;
556
557         /* Grab the skbuff where UDP header space exists. */
558         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
559                 goto out;
560
561         /*
562          * Create a UDP header
563          */
564         uh = skb->h.uh;
565         uh->source = fl->fl_ip_sport;
566         uh->dest = fl->fl_ip_dport;
567         uh->len = htons(up->len);
568         uh->check = 0;
569
570         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
571                 skb->ip_summed = CHECKSUM_NONE;
572                 goto send;
573         }
574
575         if (skb_queue_len(&sk->sk_write_queue) == 1) {
576                 skb->csum = csum_partial((char *)uh,
577                                 sizeof(struct udphdr), skb->csum);
578                 uh->check = csum_ipv6_magic(&fl->fl6_src,
579                                             &fl->fl6_dst,
580                                             up->len, fl->proto, skb->csum);
581         } else {
582                 u32 tmp_csum = 0;
583
584                 skb_queue_walk(&sk->sk_write_queue, skb) {
585                         tmp_csum = csum_add(tmp_csum, skb->csum);
586                 }
587                 tmp_csum = csum_partial((char *)uh,
588                                 sizeof(struct udphdr), tmp_csum);
589                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
590                                            &fl->fl6_dst,
591                                            up->len, fl->proto, tmp_csum);
592                 uh->check = tmp_csum;
593
594         }
595         if (uh->check == 0)
596                 uh->check = -1;
597
598 send:
599         err = ip6_push_pending_frames(sk);
600 out:
601         up->len = 0;
602         up->pending = 0;
603         return err;
604 }
605
606 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 
607                   struct msghdr *msg, size_t len)
608 {
609         struct ipv6_txoptions opt_space;
610         struct udp_sock *up = udp_sk(sk);
611         struct inet_sock *inet = inet_sk(sk);
612         struct ipv6_pinfo *np = inet6_sk(sk);
613         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
614         struct in6_addr *daddr, *final_p = NULL, final;
615         struct ipv6_txoptions *opt = NULL;
616         struct ip6_flowlabel *flowlabel = NULL;
617         struct flowi *fl = &inet->cork.fl;
618         struct dst_entry *dst;
619         int addr_len = msg->msg_namelen;
620         int ulen = len;
621         int hlimit = -1;
622         int tclass = -1;
623         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
624         int err;
625         int connected = 0;
626
627         /* destination address check */
628         if (sin6) {
629                 if (addr_len < offsetof(struct sockaddr, sa_data))
630                         return -EINVAL;
631
632                 switch (sin6->sin6_family) {
633                 case AF_INET6:
634                         if (addr_len < SIN6_LEN_RFC2133)
635                                 return -EINVAL;
636                         daddr = &sin6->sin6_addr;
637                         break;
638                 case AF_INET:
639                         goto do_udp_sendmsg;
640                 case AF_UNSPEC:
641                         msg->msg_name = sin6 = NULL;
642                         msg->msg_namelen = addr_len = 0;
643                         daddr = NULL;
644                         break;
645                 default:
646                         return -EINVAL;
647                 }
648         } else if (!up->pending) {
649                 if (sk->sk_state != TCP_ESTABLISHED)
650                         return -EDESTADDRREQ;
651                 daddr = &np->daddr;
652         } else 
653                 daddr = NULL;
654
655         if (daddr) {
656                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
657                         struct sockaddr_in sin;
658                         sin.sin_family = AF_INET;
659                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
660                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
661                         msg->msg_name = &sin;
662                         msg->msg_namelen = sizeof(sin);
663 do_udp_sendmsg:
664                         if (__ipv6_only_sock(sk))
665                                 return -ENETUNREACH;
666                         return udp_sendmsg(iocb, sk, msg, len);
667                 }
668         }
669
670         if (up->pending == AF_INET)
671                 return udp_sendmsg(iocb, sk, msg, len);
672
673         /* Rough check on arithmetic overflow,
674            better check is made in ip6_build_xmit
675            */
676         if (len > INT_MAX - sizeof(struct udphdr))
677                 return -EMSGSIZE;
678         
679         if (up->pending) {
680                 /*
681                  * There are pending frames.
682                  * The socket lock must be held while it's corked.
683                  */
684                 lock_sock(sk);
685                 if (likely(up->pending)) {
686                         if (unlikely(up->pending != AF_INET6)) {
687                                 release_sock(sk);
688                                 return -EAFNOSUPPORT;
689                         }
690                         dst = NULL;
691                         goto do_append_data;
692                 }
693                 release_sock(sk);
694         }
695         ulen += sizeof(struct udphdr);
696
697         memset(fl, 0, sizeof(*fl));
698
699         if (sin6) {
700                 if (sin6->sin6_port == 0)
701                         return -EINVAL;
702
703                 fl->fl_ip_dport = sin6->sin6_port;
704                 daddr = &sin6->sin6_addr;
705
706                 if (np->sndflow) {
707                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
708                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
709                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
710                                 if (flowlabel == NULL)
711                                         return -EINVAL;
712                                 daddr = &flowlabel->dst;
713                         }
714                 }
715
716                 /*
717                  * Otherwise it will be difficult to maintain
718                  * sk->sk_dst_cache.
719                  */
720                 if (sk->sk_state == TCP_ESTABLISHED &&
721                     ipv6_addr_equal(daddr, &np->daddr))
722                         daddr = &np->daddr;
723
724                 if (addr_len >= sizeof(struct sockaddr_in6) &&
725                     sin6->sin6_scope_id &&
726                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
727                         fl->oif = sin6->sin6_scope_id;
728         } else {
729                 if (sk->sk_state != TCP_ESTABLISHED)
730                         return -EDESTADDRREQ;
731
732                 fl->fl_ip_dport = inet->dport;
733                 daddr = &np->daddr;
734                 fl->fl6_flowlabel = np->flow_label;
735                 connected = 1;
736         }
737
738         if (!fl->oif)
739                 fl->oif = sk->sk_bound_dev_if;
740
741         if (msg->msg_controllen) {
742                 opt = &opt_space;
743                 memset(opt, 0, sizeof(struct ipv6_txoptions));
744                 opt->tot_len = sizeof(*opt);
745
746                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
747                 if (err < 0) {
748                         fl6_sock_release(flowlabel);
749                         return err;
750                 }
751                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
752                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
753                         if (flowlabel == NULL)
754                                 return -EINVAL;
755                 }
756                 if (!(opt->opt_nflen|opt->opt_flen))
757                         opt = NULL;
758                 connected = 0;
759         }
760         if (opt == NULL)
761                 opt = np->opt;
762         if (flowlabel)
763                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
764         opt = ipv6_fixup_options(&opt_space, opt);
765
766         fl->proto = IPPROTO_UDP;
767         ipv6_addr_copy(&fl->fl6_dst, daddr);
768         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
769                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
770         fl->fl_ip_sport = inet->sport;
771         
772         /* merge ip6_build_xmit from ip6_output */
773         if (opt && opt->srcrt) {
774                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
775                 ipv6_addr_copy(&final, &fl->fl6_dst);
776                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
777                 final_p = &final;
778                 connected = 0;
779         }
780
781         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
782                 fl->oif = np->mcast_oif;
783                 connected = 0;
784         }
785
786         err = ip6_dst_lookup(sk, &dst, fl);
787         if (err)
788                 goto out;
789         if (final_p)
790                 ipv6_addr_copy(&fl->fl6_dst, final_p);
791
792         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
793                 goto out;
794
795         if (hlimit < 0) {
796                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
797                         hlimit = np->mcast_hops;
798                 else
799                         hlimit = np->hop_limit;
800                 if (hlimit < 0)
801                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
802                 if (hlimit < 0)
803                         hlimit = ipv6_get_hoplimit(dst->dev);
804         }
805
806         if (tclass < 0) {
807                 tclass = np->tclass;
808                 if (tclass < 0)
809                         tclass = 0;
810         }
811
812         if (msg->msg_flags&MSG_CONFIRM)
813                 goto do_confirm;
814 back_from_confirm:
815
816         lock_sock(sk);
817         if (unlikely(up->pending)) {
818                 /* The socket is already corked while preparing it. */
819                 /* ... which is an evident application bug. --ANK */
820                 release_sock(sk);
821
822                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
823                 err = -EINVAL;
824                 goto out;
825         }
826
827         up->pending = AF_INET6;
828
829 do_append_data:
830         up->len += ulen;
831         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
832                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
833                 (struct rt6_info*)dst,
834                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
835         if (err)
836                 udp_v6_flush_pending_frames(sk);
837         else if (!corkreq)
838                 err = udp_v6_push_pending_frames(sk, up);
839
840         if (dst) {
841                 if (connected) {
842                         ip6_dst_store(sk, dst,
843                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
844                                       &np->daddr : NULL);
845                 } else {
846                         dst_release(dst);
847                 }
848         }
849
850         if (err > 0)
851                 err = np->recverr ? net_xmit_errno(err) : 0;
852         release_sock(sk);
853 out:
854         fl6_sock_release(flowlabel);
855         if (!err) {
856                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
857                 return len;
858         }
859         return err;
860
861 do_confirm:
862         dst_confirm(dst);
863         if (!(msg->msg_flags&MSG_PROBE) || len)
864                 goto back_from_confirm;
865         err = 0;
866         goto out;
867 }
868
869 static int udpv6_destroy_sock(struct sock *sk)
870 {
871         lock_sock(sk);
872         udp_v6_flush_pending_frames(sk);
873         release_sock(sk);
874
875         inet6_destroy_sock(sk);
876
877         return 0;
878 }
879
880 /*
881  *      Socket option code for UDP
882  */
883 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
884                           char __user *optval, int optlen)
885 {
886         struct udp_sock *up = udp_sk(sk);
887         int val;
888         int err = 0;
889
890         if(optlen<sizeof(int))
891                 return -EINVAL;
892
893         if (get_user(val, (int __user *)optval))
894                 return -EFAULT;
895
896         switch(optname) {
897         case UDP_CORK:
898                 if (val != 0) {
899                         up->corkflag = 1;
900                 } else {
901                         up->corkflag = 0;
902                         lock_sock(sk);
903                         udp_v6_push_pending_frames(sk, up);
904                         release_sock(sk);
905                 }
906                 break;
907                 
908         case UDP_ENCAP:
909                 switch (val) {
910                 case 0:
911                         up->encap_type = val;
912                         break;
913                 default:
914                         err = -ENOPROTOOPT;
915                         break;
916                 }
917                 break;
918
919         default:
920                 err = -ENOPROTOOPT;
921                 break;
922         };
923
924         return err;
925 }
926
927 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
928                           char __user *optval, int optlen)
929 {
930         if (level != SOL_UDP)
931                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
932         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
933 }
934
935 #ifdef CONFIG_COMPAT
936 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
937                                    char __user *optval, int optlen)
938 {
939         if (level != SOL_UDP)
940                 return compat_ipv6_setsockopt(sk, level, optname,
941                                               optval, optlen);
942         return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
943 }
944 #endif
945
946 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
947                           char __user *optval, int __user *optlen)
948 {
949         struct udp_sock *up = udp_sk(sk);
950         int val, len;
951
952         if(get_user(len,optlen))
953                 return -EFAULT;
954
955         len = min_t(unsigned int, len, sizeof(int));
956         
957         if(len < 0)
958                 return -EINVAL;
959
960         switch(optname) {
961         case UDP_CORK:
962                 val = up->corkflag;
963                 break;
964
965         case UDP_ENCAP:
966                 val = up->encap_type;
967                 break;
968
969         default:
970                 return -ENOPROTOOPT;
971         };
972
973         if(put_user(len, optlen))
974                 return -EFAULT;
975         if(copy_to_user(optval, &val,len))
976                 return -EFAULT;
977         return 0;
978 }
979
980 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
981                           char __user *optval, int __user *optlen)
982 {
983         if (level != SOL_UDP)
984                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
985         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
986 }
987
988 #ifdef CONFIG_COMPAT
989 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
990                                    char __user *optval, int __user *optlen)
991 {
992         if (level != SOL_UDP)
993                 return compat_ipv6_getsockopt(sk, level, optname,
994                                               optval, optlen);
995         return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
996 }
997 #endif
998
999 static struct inet6_protocol udpv6_protocol = {
1000         .handler        =       udpv6_rcv,
1001         .err_handler    =       udpv6_err,
1002         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1003 };
1004
1005 /* ------------------------------------------------------------------------ */
1006 #ifdef CONFIG_PROC_FS
1007
1008 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1009 {
1010         struct inet_sock *inet = inet_sk(sp);
1011         struct ipv6_pinfo *np = inet6_sk(sp);
1012         struct in6_addr *dest, *src;
1013         __u16 destp, srcp;
1014
1015         dest  = &np->daddr;
1016         src   = &np->rcv_saddr;
1017         destp = ntohs(inet->dport);
1018         srcp  = ntohs(inet->sport);
1019         seq_printf(seq,
1020                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1021                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1022                    bucket,
1023                    src->s6_addr32[0], src->s6_addr32[1],
1024                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1025                    dest->s6_addr32[0], dest->s6_addr32[1],
1026                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1027                    sp->sk_state, 
1028                    atomic_read(&sp->sk_wmem_alloc),
1029                    atomic_read(&sp->sk_rmem_alloc),
1030                    0, 0L, 0,
1031                    sock_i_uid(sp), 0,
1032                    sock_i_ino(sp),
1033                    atomic_read(&sp->sk_refcnt), sp);
1034 }
1035
1036 static int udp6_seq_show(struct seq_file *seq, void *v)
1037 {
1038         if (v == SEQ_START_TOKEN)
1039                 seq_printf(seq,
1040                            "  sl  "
1041                            "local_address                         "
1042                            "remote_address                        "
1043                            "st tx_queue rx_queue tr tm->when retrnsmt"
1044                            "   uid  timeout inode\n");
1045         else
1046                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1047         return 0;
1048 }
1049
1050 static struct file_operations udp6_seq_fops;
1051 static struct udp_seq_afinfo udp6_seq_afinfo = {
1052         .owner          = THIS_MODULE,
1053         .name           = "udp6",
1054         .family         = AF_INET6,
1055         .seq_show       = udp6_seq_show,
1056         .seq_fops       = &udp6_seq_fops,
1057 };
1058
1059 int __init udp6_proc_init(void)
1060 {
1061         return udp_proc_register(&udp6_seq_afinfo);
1062 }
1063
1064 void udp6_proc_exit(void) {
1065         udp_proc_unregister(&udp6_seq_afinfo);
1066 }
1067 #endif /* CONFIG_PROC_FS */
1068
1069 /* ------------------------------------------------------------------------ */
1070
1071 struct proto udpv6_prot = {
1072         .name              = "UDPv6",
1073         .owner             = THIS_MODULE,
1074         .close             = udpv6_close,
1075         .connect           = ip6_datagram_connect,
1076         .disconnect        = udp_disconnect,
1077         .ioctl             = udp_ioctl,
1078         .destroy           = udpv6_destroy_sock,
1079         .setsockopt        = udpv6_setsockopt,
1080         .getsockopt        = udpv6_getsockopt,
1081         .sendmsg           = udpv6_sendmsg,
1082         .recvmsg           = udpv6_recvmsg,
1083         .backlog_rcv       = udpv6_queue_rcv_skb,
1084         .hash              = udp_v6_hash,
1085         .unhash            = udp_v6_unhash,
1086         .get_port          = udp_v6_get_port,
1087         .obj_size          = sizeof(struct udp6_sock),
1088 #ifdef CONFIG_COMPAT
1089         .compat_setsockopt = compat_udpv6_setsockopt,
1090         .compat_getsockopt = compat_udpv6_getsockopt,
1091 #endif
1092 };
1093
1094 static struct inet_protosw udpv6_protosw = {
1095         .type =      SOCK_DGRAM,
1096         .protocol =  IPPROTO_UDP,
1097         .prot =      &udpv6_prot,
1098         .ops =       &inet6_dgram_ops,
1099         .capability =-1,
1100         .no_check =  UDP_CSUM_DEFAULT,
1101         .flags =     INET_PROTOSW_PERMANENT,
1102 };
1103
1104
1105 void __init udpv6_init(void)
1106 {
1107         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1108                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1109         inet6_register_protosw(&udpv6_protosw);
1110 }