Pull xpc-disengage into release branch
[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/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 <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 ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
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         /* Clear queue. */
304         if (flags&MSG_PEEK) {
305                 int clear = 0;
306                 spin_lock_bh(&sk->sk_receive_queue.lock);
307                 if (skb == skb_peek(&sk->sk_receive_queue)) {
308                         __skb_unlink(skb, &sk->sk_receive_queue);
309                         clear = 1;
310                 }
311                 spin_unlock_bh(&sk->sk_receive_queue.lock);
312                 if (clear)
313                         kfree_skb(skb);
314         }
315
316         skb_free_datagram(sk, skb);
317
318         if (flags & MSG_DONTWAIT) {
319                 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
320                 return -EAGAIN;
321         }
322         goto try_again;
323 }
324
325 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
326                int type, int code, int offset, __u32 info)
327 {
328         struct ipv6_pinfo *np;
329         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
330         struct net_device *dev = skb->dev;
331         struct in6_addr *saddr = &hdr->saddr;
332         struct in6_addr *daddr = &hdr->daddr;
333         struct udphdr *uh = (struct udphdr*)(skb->data+offset);
334         struct sock *sk;
335         int err;
336
337         sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
338    
339         if (sk == NULL)
340                 return;
341
342         np = inet6_sk(sk);
343
344         if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
345                 goto out;
346
347         if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
348                 goto out;
349
350         if (np->recverr)
351                 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
352
353         sk->sk_err = err;
354         sk->sk_error_report(sk);
355 out:
356         sock_put(sk);
357 }
358
359 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
360 {
361         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
362                 kfree_skb(skb);
363                 return -1;
364         }
365
366         if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
367                 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
368                         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
369                         kfree_skb(skb);
370                         return 0;
371                 }
372                 skb->ip_summed = CHECKSUM_UNNECESSARY;
373         }
374
375         if (sock_queue_rcv_skb(sk,skb)<0) {
376                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
377                 kfree_skb(skb);
378                 return 0;
379         }
380         UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
381         return 0;
382 }
383
384 static struct sock *udp_v6_mcast_next(struct sock *sk,
385                                       u16 loc_port, struct in6_addr *loc_addr,
386                                       u16 rmt_port, struct in6_addr *rmt_addr,
387                                       int dif)
388 {
389         struct hlist_node *node;
390         struct sock *s = sk;
391         unsigned short num = ntohs(loc_port);
392
393         sk_for_each_from(s, node) {
394                 struct inet_sock *inet = inet_sk(s);
395
396                 if (inet->num == num && s->sk_family == PF_INET6) {
397                         struct ipv6_pinfo *np = inet6_sk(s);
398                         if (inet->dport) {
399                                 if (inet->dport != rmt_port)
400                                         continue;
401                         }
402                         if (!ipv6_addr_any(&np->daddr) &&
403                             !ipv6_addr_equal(&np->daddr, rmt_addr))
404                                 continue;
405
406                         if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
407                                 continue;
408
409                         if (!ipv6_addr_any(&np->rcv_saddr)) {
410                                 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
411                                         continue;
412                         }
413                         if(!inet6_mc_check(s, loc_addr, rmt_addr))
414                                 continue;
415                         return s;
416                 }
417         }
418         return NULL;
419 }
420
421 /*
422  * Note: called only from the BH handler context,
423  * so we don't need to lock the hashes.
424  */
425 static void udpv6_mcast_deliver(struct udphdr *uh,
426                                 struct in6_addr *saddr, struct in6_addr *daddr,
427                                 struct sk_buff *skb)
428 {
429         struct sock *sk, *sk2;
430         int dif;
431
432         read_lock(&udp_hash_lock);
433         sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
434         dif = skb->dev->ifindex;
435         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
436         if (!sk) {
437                 kfree_skb(skb);
438                 goto out;
439         }
440
441         sk2 = sk;
442         while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
443                                         uh->source, saddr, dif))) {
444                 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
445                 if (buff)
446                         udpv6_queue_rcv_skb(sk2, buff);
447         }
448         udpv6_queue_rcv_skb(sk, skb);
449 out:
450         read_unlock(&udp_hash_lock);
451 }
452
453 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
454 {
455         struct sk_buff *skb = *pskb;
456         struct sock *sk;
457         struct udphdr *uh;
458         struct net_device *dev = skb->dev;
459         struct in6_addr *saddr, *daddr;
460         u32 ulen = 0;
461
462         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
463                 goto short_packet;
464
465         saddr = &skb->nh.ipv6h->saddr;
466         daddr = &skb->nh.ipv6h->daddr;
467         uh = skb->h.uh;
468
469         ulen = ntohs(uh->len);
470
471         /* Check for jumbo payload */
472         if (ulen == 0)
473                 ulen = skb->len;
474
475         if (ulen > skb->len || ulen < sizeof(*uh))
476                 goto short_packet;
477
478         if (uh->check == 0) {
479                 /* RFC 2460 section 8.1 says that we SHOULD log
480                    this error. Well, it is reasonable.
481                  */
482                 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
483                 goto discard;
484         }
485
486         if (ulen < skb->len) {
487                 if (pskb_trim_rcsum(skb, ulen))
488                         goto discard;
489                 saddr = &skb->nh.ipv6h->saddr;
490                 daddr = &skb->nh.ipv6h->daddr;
491                 uh = skb->h.uh;
492         }
493
494         if (skb->ip_summed==CHECKSUM_HW) {
495                 skb->ip_summed = CHECKSUM_UNNECESSARY;
496                 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
497                         LIMIT_NETDEBUG(KERN_DEBUG "udp v6 hw csum failure.\n");
498                         skb->ip_summed = CHECKSUM_NONE;
499                 }
500         }
501         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
502                 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
503
504         /* 
505          *      Multicast receive code 
506          */
507         if (ipv6_addr_is_multicast(daddr)) {
508                 udpv6_mcast_deliver(uh, saddr, daddr, skb);
509                 return 0;
510         }
511
512         /* Unicast */
513
514         /* 
515          * check socket cache ... must talk to Alan about his plans
516          * for sock caches... i'll skip this for now.
517          */
518         sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
519
520         if (sk == NULL) {
521                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
522                         goto discard;
523
524                 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
525                     (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
526                         goto discard;
527                 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
528
529                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
530
531                 kfree_skb(skb);
532                 return(0);
533         }
534         
535         /* deliver */
536         
537         udpv6_queue_rcv_skb(sk, skb);
538         sock_put(sk);
539         return(0);
540
541 short_packet:   
542         if (net_ratelimit())
543                 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
544
545 discard:
546         UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
547         kfree_skb(skb);
548         return(0);      
549 }
550 /*
551  * Throw away all pending data and cancel the corking. Socket is locked.
552  */
553 static void udp_v6_flush_pending_frames(struct sock *sk)
554 {
555         struct udp_sock *up = udp_sk(sk);
556
557         if (up->pending) {
558                 up->len = 0;
559                 up->pending = 0;
560                 ip6_flush_pending_frames(sk);
561         }
562 }
563
564 /*
565  *      Sending
566  */
567
568 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
569 {
570         struct sk_buff *skb;
571         struct udphdr *uh;
572         struct inet_sock *inet = inet_sk(sk);
573         struct flowi *fl = &inet->cork.fl;
574         int err = 0;
575
576         /* Grab the skbuff where UDP header space exists. */
577         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
578                 goto out;
579
580         /*
581          * Create a UDP header
582          */
583         uh = skb->h.uh;
584         uh->source = fl->fl_ip_sport;
585         uh->dest = fl->fl_ip_dport;
586         uh->len = htons(up->len);
587         uh->check = 0;
588
589         if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
590                 skb->ip_summed = CHECKSUM_NONE;
591                 goto send;
592         }
593
594         if (skb_queue_len(&sk->sk_write_queue) == 1) {
595                 skb->csum = csum_partial((char *)uh,
596                                 sizeof(struct udphdr), skb->csum);
597                 uh->check = csum_ipv6_magic(&fl->fl6_src,
598                                             &fl->fl6_dst,
599                                             up->len, fl->proto, skb->csum);
600         } else {
601                 u32 tmp_csum = 0;
602
603                 skb_queue_walk(&sk->sk_write_queue, skb) {
604                         tmp_csum = csum_add(tmp_csum, skb->csum);
605                 }
606                 tmp_csum = csum_partial((char *)uh,
607                                 sizeof(struct udphdr), tmp_csum);
608                 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
609                                            &fl->fl6_dst,
610                                            up->len, fl->proto, tmp_csum);
611                 uh->check = tmp_csum;
612
613         }
614         if (uh->check == 0)
615                 uh->check = -1;
616
617 send:
618         err = ip6_push_pending_frames(sk);
619 out:
620         up->len = 0;
621         up->pending = 0;
622         return err;
623 }
624
625 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 
626                   struct msghdr *msg, size_t len)
627 {
628         struct ipv6_txoptions opt_space;
629         struct udp_sock *up = udp_sk(sk);
630         struct inet_sock *inet = inet_sk(sk);
631         struct ipv6_pinfo *np = inet6_sk(sk);
632         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
633         struct in6_addr *daddr, *final_p = NULL, final;
634         struct ipv6_txoptions *opt = NULL;
635         struct ip6_flowlabel *flowlabel = NULL;
636         struct flowi *fl = &inet->cork.fl;
637         struct dst_entry *dst;
638         int addr_len = msg->msg_namelen;
639         int ulen = len;
640         int hlimit = -1;
641         int tclass = -1;
642         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
643         int err;
644         int connected = 0;
645
646         /* destination address check */
647         if (sin6) {
648                 if (addr_len < offsetof(struct sockaddr, sa_data))
649                         return -EINVAL;
650
651                 switch (sin6->sin6_family) {
652                 case AF_INET6:
653                         if (addr_len < SIN6_LEN_RFC2133)
654                                 return -EINVAL;
655                         daddr = &sin6->sin6_addr;
656                         break;
657                 case AF_INET:
658                         goto do_udp_sendmsg;
659                 case AF_UNSPEC:
660                         msg->msg_name = sin6 = NULL;
661                         msg->msg_namelen = addr_len = 0;
662                         daddr = NULL;
663                         break;
664                 default:
665                         return -EINVAL;
666                 }
667         } else if (!up->pending) {
668                 if (sk->sk_state != TCP_ESTABLISHED)
669                         return -EDESTADDRREQ;
670                 daddr = &np->daddr;
671         } else 
672                 daddr = NULL;
673
674         if (daddr) {
675                 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
676                         struct sockaddr_in sin;
677                         sin.sin_family = AF_INET;
678                         sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
679                         sin.sin_addr.s_addr = daddr->s6_addr32[3];
680                         msg->msg_name = &sin;
681                         msg->msg_namelen = sizeof(sin);
682 do_udp_sendmsg:
683                         if (__ipv6_only_sock(sk))
684                                 return -ENETUNREACH;
685                         return udp_sendmsg(iocb, sk, msg, len);
686                 }
687         }
688
689         if (up->pending == AF_INET)
690                 return udp_sendmsg(iocb, sk, msg, len);
691
692         /* Rough check on arithmetic overflow,
693            better check is made in ip6_build_xmit
694            */
695         if (len > INT_MAX - sizeof(struct udphdr))
696                 return -EMSGSIZE;
697         
698         if (up->pending) {
699                 /*
700                  * There are pending frames.
701                  * The socket lock must be held while it's corked.
702                  */
703                 lock_sock(sk);
704                 if (likely(up->pending)) {
705                         if (unlikely(up->pending != AF_INET6)) {
706                                 release_sock(sk);
707                                 return -EAFNOSUPPORT;
708                         }
709                         dst = NULL;
710                         goto do_append_data;
711                 }
712                 release_sock(sk);
713         }
714         ulen += sizeof(struct udphdr);
715
716         memset(fl, 0, sizeof(*fl));
717
718         if (sin6) {
719                 if (sin6->sin6_port == 0)
720                         return -EINVAL;
721
722                 fl->fl_ip_dport = sin6->sin6_port;
723                 daddr = &sin6->sin6_addr;
724
725                 if (np->sndflow) {
726                         fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
727                         if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
728                                 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
729                                 if (flowlabel == NULL)
730                                         return -EINVAL;
731                                 daddr = &flowlabel->dst;
732                         }
733                 }
734
735                 /*
736                  * Otherwise it will be difficult to maintain
737                  * sk->sk_dst_cache.
738                  */
739                 if (sk->sk_state == TCP_ESTABLISHED &&
740                     ipv6_addr_equal(daddr, &np->daddr))
741                         daddr = &np->daddr;
742
743                 if (addr_len >= sizeof(struct sockaddr_in6) &&
744                     sin6->sin6_scope_id &&
745                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
746                         fl->oif = sin6->sin6_scope_id;
747         } else {
748                 if (sk->sk_state != TCP_ESTABLISHED)
749                         return -EDESTADDRREQ;
750
751                 fl->fl_ip_dport = inet->dport;
752                 daddr = &np->daddr;
753                 fl->fl6_flowlabel = np->flow_label;
754                 connected = 1;
755         }
756
757         if (!fl->oif)
758                 fl->oif = sk->sk_bound_dev_if;
759
760         if (msg->msg_controllen) {
761                 opt = &opt_space;
762                 memset(opt, 0, sizeof(struct ipv6_txoptions));
763                 opt->tot_len = sizeof(*opt);
764
765                 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
766                 if (err < 0) {
767                         fl6_sock_release(flowlabel);
768                         return err;
769                 }
770                 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
771                         flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
772                         if (flowlabel == NULL)
773                                 return -EINVAL;
774                 }
775                 if (!(opt->opt_nflen|opt->opt_flen))
776                         opt = NULL;
777                 connected = 0;
778         }
779         if (opt == NULL)
780                 opt = np->opt;
781         opt = fl6_merge_options(&opt_space, flowlabel, opt);
782
783         fl->proto = IPPROTO_UDP;
784         ipv6_addr_copy(&fl->fl6_dst, daddr);
785         if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
786                 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
787         fl->fl_ip_sport = inet->sport;
788         
789         /* merge ip6_build_xmit from ip6_output */
790         if (opt && opt->srcrt) {
791                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
792                 ipv6_addr_copy(&final, &fl->fl6_dst);
793                 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
794                 final_p = &final;
795                 connected = 0;
796         }
797
798         if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
799                 fl->oif = np->mcast_oif;
800                 connected = 0;
801         }
802
803         err = ip6_dst_lookup(sk, &dst, fl);
804         if (err)
805                 goto out;
806         if (final_p)
807                 ipv6_addr_copy(&fl->fl6_dst, final_p);
808
809         if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
810                 goto out;
811
812         if (hlimit < 0) {
813                 if (ipv6_addr_is_multicast(&fl->fl6_dst))
814                         hlimit = np->mcast_hops;
815                 else
816                         hlimit = np->hop_limit;
817                 if (hlimit < 0)
818                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
819                 if (hlimit < 0)
820                         hlimit = ipv6_get_hoplimit(dst->dev);
821         }
822
823         if (tclass < 0) {
824                 tclass = np->tclass;
825                 if (tclass < 0)
826                         tclass = 0;
827         }
828
829         if (msg->msg_flags&MSG_CONFIRM)
830                 goto do_confirm;
831 back_from_confirm:
832
833         lock_sock(sk);
834         if (unlikely(up->pending)) {
835                 /* The socket is already corked while preparing it. */
836                 /* ... which is an evident application bug. --ANK */
837                 release_sock(sk);
838
839                 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
840                 err = -EINVAL;
841                 goto out;
842         }
843
844         up->pending = AF_INET6;
845
846 do_append_data:
847         up->len += ulen;
848         err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
849                 sizeof(struct udphdr), hlimit, tclass, opt, fl,
850                 (struct rt6_info*)dst,
851                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
852         if (err)
853                 udp_v6_flush_pending_frames(sk);
854         else if (!corkreq)
855                 err = udp_v6_push_pending_frames(sk, up);
856
857         if (dst) {
858                 if (connected) {
859                         ip6_dst_store(sk, dst,
860                                       ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
861                                       &np->daddr : NULL);
862                 } else {
863                         dst_release(dst);
864                 }
865         }
866
867         if (err > 0)
868                 err = np->recverr ? net_xmit_errno(err) : 0;
869         release_sock(sk);
870 out:
871         fl6_sock_release(flowlabel);
872         if (!err) {
873                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
874                 return len;
875         }
876         return err;
877
878 do_confirm:
879         dst_confirm(dst);
880         if (!(msg->msg_flags&MSG_PROBE) || len)
881                 goto back_from_confirm;
882         err = 0;
883         goto out;
884 }
885
886 static int udpv6_destroy_sock(struct sock *sk)
887 {
888         lock_sock(sk);
889         udp_v6_flush_pending_frames(sk);
890         release_sock(sk);
891
892         inet6_destroy_sock(sk);
893
894         return 0;
895 }
896
897 /*
898  *      Socket option code for UDP
899  */
900 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 
901                           char __user *optval, int optlen)
902 {
903         struct udp_sock *up = udp_sk(sk);
904         int val;
905         int err = 0;
906
907         if (level != SOL_UDP)
908                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
909
910         if(optlen<sizeof(int))
911                 return -EINVAL;
912
913         if (get_user(val, (int __user *)optval))
914                 return -EFAULT;
915
916         switch(optname) {
917         case UDP_CORK:
918                 if (val != 0) {
919                         up->corkflag = 1;
920                 } else {
921                         up->corkflag = 0;
922                         lock_sock(sk);
923                         udp_v6_push_pending_frames(sk, up);
924                         release_sock(sk);
925                 }
926                 break;
927                 
928         case UDP_ENCAP:
929                 switch (val) {
930                 case 0:
931                         up->encap_type = val;
932                         break;
933                 default:
934                         err = -ENOPROTOOPT;
935                         break;
936                 }
937                 break;
938
939         default:
940                 err = -ENOPROTOOPT;
941                 break;
942         };
943
944         return err;
945 }
946
947 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 
948                           char __user *optval, int __user *optlen)
949 {
950         struct udp_sock *up = udp_sk(sk);
951         int val, len;
952
953         if (level != SOL_UDP)
954                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
955
956         if(get_user(len,optlen))
957                 return -EFAULT;
958
959         len = min_t(unsigned int, len, sizeof(int));
960         
961         if(len < 0)
962                 return -EINVAL;
963
964         switch(optname) {
965         case UDP_CORK:
966                 val = up->corkflag;
967                 break;
968
969         case UDP_ENCAP:
970                 val = up->encap_type;
971                 break;
972
973         default:
974                 return -ENOPROTOOPT;
975         };
976
977         if(put_user(len, optlen))
978                 return -EFAULT;
979         if(copy_to_user(optval, &val,len))
980                 return -EFAULT;
981         return 0;
982 }
983
984 static struct inet6_protocol udpv6_protocol = {
985         .handler        =       udpv6_rcv,
986         .err_handler    =       udpv6_err,
987         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
988 };
989
990 /* ------------------------------------------------------------------------ */
991 #ifdef CONFIG_PROC_FS
992
993 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
994 {
995         struct inet_sock *inet = inet_sk(sp);
996         struct ipv6_pinfo *np = inet6_sk(sp);
997         struct in6_addr *dest, *src;
998         __u16 destp, srcp;
999
1000         dest  = &np->daddr;
1001         src   = &np->rcv_saddr;
1002         destp = ntohs(inet->dport);
1003         srcp  = ntohs(inet->sport);
1004         seq_printf(seq,
1005                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1006                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1007                    bucket,
1008                    src->s6_addr32[0], src->s6_addr32[1],
1009                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1010                    dest->s6_addr32[0], dest->s6_addr32[1],
1011                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1012                    sp->sk_state, 
1013                    atomic_read(&sp->sk_wmem_alloc),
1014                    atomic_read(&sp->sk_rmem_alloc),
1015                    0, 0L, 0,
1016                    sock_i_uid(sp), 0,
1017                    sock_i_ino(sp),
1018                    atomic_read(&sp->sk_refcnt), sp);
1019 }
1020
1021 static int udp6_seq_show(struct seq_file *seq, void *v)
1022 {
1023         if (v == SEQ_START_TOKEN)
1024                 seq_printf(seq,
1025                            "  sl  "
1026                            "local_address                         "
1027                            "remote_address                        "
1028                            "st tx_queue rx_queue tr tm->when retrnsmt"
1029                            "   uid  timeout inode\n");
1030         else
1031                 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1032         return 0;
1033 }
1034
1035 static struct file_operations udp6_seq_fops;
1036 static struct udp_seq_afinfo udp6_seq_afinfo = {
1037         .owner          = THIS_MODULE,
1038         .name           = "udp6",
1039         .family         = AF_INET6,
1040         .seq_show       = udp6_seq_show,
1041         .seq_fops       = &udp6_seq_fops,
1042 };
1043
1044 int __init udp6_proc_init(void)
1045 {
1046         return udp_proc_register(&udp6_seq_afinfo);
1047 }
1048
1049 void udp6_proc_exit(void) {
1050         udp_proc_unregister(&udp6_seq_afinfo);
1051 }
1052 #endif /* CONFIG_PROC_FS */
1053
1054 /* ------------------------------------------------------------------------ */
1055
1056 struct proto udpv6_prot = {
1057         .name =         "UDPv6",
1058         .owner =        THIS_MODULE,
1059         .close =        udpv6_close,
1060         .connect =      ip6_datagram_connect,
1061         .disconnect =   udp_disconnect,
1062         .ioctl =        udp_ioctl,
1063         .destroy =      udpv6_destroy_sock,
1064         .setsockopt =   udpv6_setsockopt,
1065         .getsockopt =   udpv6_getsockopt,
1066         .sendmsg =      udpv6_sendmsg,
1067         .recvmsg =      udpv6_recvmsg,
1068         .backlog_rcv =  udpv6_queue_rcv_skb,
1069         .hash =         udp_v6_hash,
1070         .unhash =       udp_v6_unhash,
1071         .get_port =     udp_v6_get_port,
1072         .obj_size =     sizeof(struct udp6_sock),
1073 };
1074
1075 static struct inet_protosw udpv6_protosw = {
1076         .type =      SOCK_DGRAM,
1077         .protocol =  IPPROTO_UDP,
1078         .prot =      &udpv6_prot,
1079         .ops =       &inet6_dgram_ops,
1080         .capability =-1,
1081         .no_check =  UDP_CSUM_DEFAULT,
1082         .flags =     INET_PROTOSW_PERMANENT,
1083 };
1084
1085
1086 void __init udpv6_init(void)
1087 {
1088         if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1089                 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1090         inet6_register_protosw(&udpv6_protosw);
1091 }