[IP_SOCKGLUE]: Remove most of the tcp specific calls
[linux-2.6.git] / net / ipv6 / ipv6_sockglue.c
1 /*
2  *      IPv6 BSD socket options interface
3  *      Linux INET6 implementation 
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>     
7  *
8  *      Based on linux/net/ipv4/ip_sockglue.c
9  *
10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
11  *
12  *      This program is free software; you can redistribute it and/or
13  *      modify it under the terms of the GNU General Public License
14  *      as published by the Free Software Foundation; either version
15  *      2 of the License, or (at your option) any later version.
16  *
17  *      FIXME: Make the setsockopt code POSIX compliant: That is
18  *
19  *      o       Return -EINVAL for setsockopt of short lengths
20  *      o       Truncate getsockopt returns
21  *      o       Return an optlen of the truncated length if need be
22  *
23  *      Changes:
24  *      David L Stevens <dlstevens@us.ibm.com>:
25  *              - added multicast source filtering API for MLDv2
26  */
27
28 #include <linux/module.h>
29 #include <linux/config.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/sockios.h>
34 #include <linux/sched.h>
35 #include <linux/net.h>
36 #include <linux/in6.h>
37 #include <linux/netdevice.h>
38 #include <linux/if_arp.h>
39 #include <linux/init.h>
40 #include <linux/sysctl.h>
41 #include <linux/netfilter.h>
42
43 #include <net/sock.h>
44 #include <net/snmp.h>
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/inet_common.h>
52 #include <net/tcp.h>
53 #include <net/udp.h>
54 #include <net/xfrm.h>
55
56 #include <asm/uaccess.h>
57
58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
59
60 static struct packet_type ipv6_packet_type = {
61         .type = __constant_htons(ETH_P_IPV6), 
62         .func = ipv6_rcv,
63 };
64
65 struct ip6_ra_chain *ip6_ra_chain;
66 DEFINE_RWLOCK(ip6_ra_lock);
67
68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
69 {
70         struct ip6_ra_chain *ra, *new_ra, **rap;
71
72         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
73         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
74                 return -EINVAL;
75
76         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
77
78         write_lock_bh(&ip6_ra_lock);
79         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
80                 if (ra->sk == sk) {
81                         if (sel>=0) {
82                                 write_unlock_bh(&ip6_ra_lock);
83                                 kfree(new_ra);
84                                 return -EADDRINUSE;
85                         }
86
87                         *rap = ra->next;
88                         write_unlock_bh(&ip6_ra_lock);
89
90                         if (ra->destructor)
91                                 ra->destructor(sk);
92                         sock_put(sk);
93                         kfree(ra);
94                         return 0;
95                 }
96         }
97         if (new_ra == NULL) {
98                 write_unlock_bh(&ip6_ra_lock);
99                 return -ENOBUFS;
100         }
101         new_ra->sk = sk;
102         new_ra->sel = sel;
103         new_ra->destructor = destructor;
104         new_ra->next = ra;
105         *rap = new_ra;
106         sock_hold(sk);
107         write_unlock_bh(&ip6_ra_lock);
108         return 0;
109 }
110
111 int ipv6_setsockopt(struct sock *sk, int level, int optname,
112                     char __user *optval, int optlen)
113 {
114         struct ipv6_pinfo *np = inet6_sk(sk);
115         int val, valbool;
116         int retv = -ENOPROTOOPT;
117
118         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
119                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
120
121         if(level!=SOL_IPV6)
122                 goto out;
123
124         if (optval == NULL)
125                 val=0;
126         else if (get_user(val, (int __user *) optval))
127                 return -EFAULT;
128
129         valbool = (val!=0);
130
131         lock_sock(sk);
132
133         switch (optname) {
134
135         case IPV6_ADDRFORM:
136                 if (val == PF_INET) {
137                         struct ipv6_txoptions *opt;
138                         struct sk_buff *pktopt;
139
140                         if (sk->sk_protocol != IPPROTO_UDP &&
141                             sk->sk_protocol != IPPROTO_TCP)
142                                 break;
143
144                         if (sk->sk_state != TCP_ESTABLISHED) {
145                                 retv = -ENOTCONN;
146                                 break;
147                         }
148
149                         if (ipv6_only_sock(sk) ||
150                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
151                                 retv = -EADDRNOTAVAIL;
152                                 break;
153                         }
154
155                         fl6_free_socklist(sk);
156                         ipv6_sock_mc_close(sk);
157
158                         /*
159                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
160                          * remove it from the refcnt debug socks count in the
161                          * original family...
162                          */
163                         sk_refcnt_debug_dec(sk);
164
165                         if (sk->sk_protocol == IPPROTO_TCP) {
166                                 struct inet_connection_sock *icsk = inet_csk(sk);
167
168                                 local_bh_disable();
169                                 sock_prot_dec_use(sk->sk_prot);
170                                 sock_prot_inc_use(&tcp_prot);
171                                 local_bh_enable();
172                                 sk->sk_prot = &tcp_prot;
173                                 icsk->icsk_af_ops = &ipv4_specific;
174                                 sk->sk_socket->ops = &inet_stream_ops;
175                                 sk->sk_family = PF_INET;
176                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
177                         } else {
178                                 local_bh_disable();
179                                 sock_prot_dec_use(sk->sk_prot);
180                                 sock_prot_inc_use(&udp_prot);
181                                 local_bh_enable();
182                                 sk->sk_prot = &udp_prot;
183                                 sk->sk_socket->ops = &inet_dgram_ops;
184                                 sk->sk_family = PF_INET;
185                         }
186                         opt = xchg(&np->opt, NULL);
187                         if (opt)
188                                 sock_kfree_s(sk, opt, opt->tot_len);
189                         pktopt = xchg(&np->pktoptions, NULL);
190                         if (pktopt)
191                                 kfree_skb(pktopt);
192
193                         sk->sk_destruct = inet_sock_destruct;
194                         /*
195                          * ... and add it to the refcnt debug socks count
196                          * in the new family. -acme
197                          */
198                         sk_refcnt_debug_inc(sk);
199                         module_put(THIS_MODULE);
200                         retv = 0;
201                         break;
202                 }
203                 goto e_inval;
204
205         case IPV6_V6ONLY:
206                 if (inet_sk(sk)->num)
207                         goto e_inval;
208                 np->ipv6only = valbool;
209                 retv = 0;
210                 break;
211
212         case IPV6_RECVPKTINFO:
213                 np->rxopt.bits.rxinfo = valbool;
214                 retv = 0;
215                 break;
216                 
217         case IPV6_2292PKTINFO:
218                 np->rxopt.bits.rxoinfo = valbool;
219                 retv = 0;
220                 break;
221
222         case IPV6_RECVHOPLIMIT:
223                 np->rxopt.bits.rxhlim = valbool;
224                 retv = 0;
225                 break;
226
227         case IPV6_2292HOPLIMIT:
228                 np->rxopt.bits.rxohlim = valbool;
229                 retv = 0;
230                 break;
231
232         case IPV6_RECVRTHDR:
233                 if (val < 0 || val > 2)
234                         goto e_inval;
235                 np->rxopt.bits.srcrt = val;
236                 retv = 0;
237                 break;
238
239         case IPV6_2292RTHDR:
240                 if (val < 0 || val > 2)
241                         goto e_inval;
242                 np->rxopt.bits.osrcrt = val;
243                 retv = 0;
244                 break;
245
246         case IPV6_RECVHOPOPTS:
247                 np->rxopt.bits.hopopts = valbool;
248                 retv = 0;
249                 break;
250
251         case IPV6_2292HOPOPTS:
252                 np->rxopt.bits.ohopopts = valbool;
253                 retv = 0;
254                 break;
255
256         case IPV6_RECVDSTOPTS:
257                 np->rxopt.bits.dstopts = valbool;
258                 retv = 0;
259                 break;
260
261         case IPV6_2292DSTOPTS:
262                 np->rxopt.bits.odstopts = valbool;
263                 retv = 0;
264                 break;
265
266         case IPV6_TCLASS:
267                 if (val < 0 || val > 0xff)
268                         goto e_inval;
269                 np->tclass = val;
270                 retv = 0;
271                 break;
272                 
273         case IPV6_RECVTCLASS:
274                 np->rxopt.bits.rxtclass = valbool;
275                 retv = 0;
276                 break;
277
278         case IPV6_FLOWINFO:
279                 np->rxopt.bits.rxflow = valbool;
280                 retv = 0;
281                 break;
282
283         case IPV6_HOPOPTS:
284         case IPV6_RTHDRDSTOPTS:
285         case IPV6_RTHDR:
286         case IPV6_DSTOPTS:
287         {
288                 struct ipv6_txoptions *opt;
289                 if (optlen == 0)
290                         optval = NULL;
291
292                 /* hop-by-hop / destination options are privileged option */
293                 retv = -EPERM;
294                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
295                         break;
296
297                 retv = -EINVAL;
298                 if (optlen & 0x7 || optlen > 8 * 255)
299                         break;
300
301                 opt = ipv6_renew_options(sk, np->opt, optname,
302                                          (struct ipv6_opt_hdr __user *)optval,
303                                          optlen);
304                 if (IS_ERR(opt)) {
305                         retv = PTR_ERR(opt);
306                         break;
307                 }
308
309                 /* routing header option needs extra check */
310                 if (optname == IPV6_RTHDR && opt->srcrt) {
311                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
312                         if (rthdr->type)
313                                 goto sticky_done;
314                         if ((rthdr->hdrlen & 1) ||
315                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
316                                 goto sticky_done;
317                 }
318
319                 retv = 0;
320                 if (inet_sk(sk)->is_icsk) {
321                         if (opt) {
322                                 struct inet_connection_sock *icsk = inet_csk(sk);
323                                 if (!((1 << sk->sk_state) &
324                                       (TCPF_LISTEN | TCPF_CLOSE))
325                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
326                                         icsk->icsk_ext_hdr_len =
327                                                 opt->opt_flen + opt->opt_nflen;
328                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
329                                 }
330                         }
331                         opt = xchg(&np->opt, opt);
332                         sk_dst_reset(sk);
333                 } else {
334                         write_lock(&sk->sk_dst_lock);
335                         opt = xchg(&np->opt, opt);
336                         write_unlock(&sk->sk_dst_lock);
337                         sk_dst_reset(sk);
338                 }
339 sticky_done:
340                 if (opt)
341                         sock_kfree_s(sk, opt, opt->tot_len);
342                 break;
343         }
344
345         case IPV6_2292PKTOPTIONS:
346         {
347                 struct ipv6_txoptions *opt = NULL;
348                 struct msghdr msg;
349                 struct flowi fl;
350                 int junk;
351
352                 fl.fl6_flowlabel = 0;
353                 fl.oif = sk->sk_bound_dev_if;
354
355                 if (optlen == 0)
356                         goto update;
357
358                 /* 1K is probably excessive
359                  * 1K is surely not enough, 2K per standard header is 16K.
360                  */
361                 retv = -EINVAL;
362                 if (optlen > 64*1024)
363                         break;
364
365                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
366                 retv = -ENOBUFS;
367                 if (opt == NULL)
368                         break;
369
370                 memset(opt, 0, sizeof(*opt));
371                 opt->tot_len = sizeof(*opt) + optlen;
372                 retv = -EFAULT;
373                 if (copy_from_user(opt+1, optval, optlen))
374                         goto done;
375
376                 msg.msg_controllen = optlen;
377                 msg.msg_control = (void*)(opt+1);
378
379                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
380                 if (retv)
381                         goto done;
382 update:
383                 retv = 0;
384                 if (inet_sk(sk)->is_icsk) {
385                         if (opt) {
386                                 struct inet_connection_sock *icsk = inet_csk(sk);
387                                 if (!((1 << sk->sk_state) &
388                                       (TCPF_LISTEN | TCPF_CLOSE))
389                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
390                                         icsk->icsk_ext_hdr_len =
391                                                 opt->opt_flen + opt->opt_nflen;
392                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
393                                 }
394                         }
395                         opt = xchg(&np->opt, opt);
396                         sk_dst_reset(sk);
397                 } else {
398                         write_lock(&sk->sk_dst_lock);
399                         opt = xchg(&np->opt, opt);
400                         write_unlock(&sk->sk_dst_lock);
401                         sk_dst_reset(sk);
402                 }
403
404 done:
405                 if (opt)
406                         sock_kfree_s(sk, opt, opt->tot_len);
407                 break;
408         }
409         case IPV6_UNICAST_HOPS:
410                 if (val > 255 || val < -1)
411                         goto e_inval;
412                 np->hop_limit = val;
413                 retv = 0;
414                 break;
415
416         case IPV6_MULTICAST_HOPS:
417                 if (sk->sk_type == SOCK_STREAM)
418                         goto e_inval;
419                 if (val > 255 || val < -1)
420                         goto e_inval;
421                 np->mcast_hops = val;
422                 retv = 0;
423                 break;
424
425         case IPV6_MULTICAST_LOOP:
426                 np->mc_loop = valbool;
427                 retv = 0;
428                 break;
429
430         case IPV6_MULTICAST_IF:
431                 if (sk->sk_type == SOCK_STREAM)
432                         goto e_inval;
433                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
434                         goto e_inval;
435
436                 if (__dev_get_by_index(val) == NULL) {
437                         retv = -ENODEV;
438                         break;
439                 }
440                 np->mcast_oif = val;
441                 retv = 0;
442                 break;
443         case IPV6_ADD_MEMBERSHIP:
444         case IPV6_DROP_MEMBERSHIP:
445         {
446                 struct ipv6_mreq mreq;
447
448                 retv = -EFAULT;
449                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
450                         break;
451
452                 if (optname == IPV6_ADD_MEMBERSHIP)
453                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
454                 else
455                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
456                 break;
457         }
458         case IPV6_JOIN_ANYCAST:
459         case IPV6_LEAVE_ANYCAST:
460         {
461                 struct ipv6_mreq mreq;
462
463                 if (optlen != sizeof(struct ipv6_mreq))
464                         goto e_inval;
465
466                 retv = -EFAULT;
467                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
468                         break;
469
470                 if (optname == IPV6_JOIN_ANYCAST)
471                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
472                 else
473                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
474                 break;
475         }
476         case MCAST_JOIN_GROUP:
477         case MCAST_LEAVE_GROUP:
478         {
479                 struct group_req greq;
480                 struct sockaddr_in6 *psin6;
481
482                 retv = -EFAULT;
483                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
484                         break;
485                 if (greq.gr_group.ss_family != AF_INET6) {
486                         retv = -EADDRNOTAVAIL;
487                         break;
488                 }
489                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
490                 if (optname == MCAST_JOIN_GROUP)
491                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
492                                 &psin6->sin6_addr);
493                 else
494                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
495                                 &psin6->sin6_addr);
496                 break;
497         }
498         case MCAST_JOIN_SOURCE_GROUP:
499         case MCAST_LEAVE_SOURCE_GROUP:
500         case MCAST_BLOCK_SOURCE:
501         case MCAST_UNBLOCK_SOURCE:
502         {
503                 struct group_source_req greqs;
504                 int omode, add;
505
506                 if (optlen != sizeof(struct group_source_req))
507                         goto e_inval;
508                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
509                         retv = -EFAULT;
510                         break;
511                 }
512                 if (greqs.gsr_group.ss_family != AF_INET6 ||
513                     greqs.gsr_source.ss_family != AF_INET6) {
514                         retv = -EADDRNOTAVAIL;
515                         break;
516                 }
517                 if (optname == MCAST_BLOCK_SOURCE) {
518                         omode = MCAST_EXCLUDE;
519                         add = 1;
520                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
521                         omode = MCAST_EXCLUDE;
522                         add = 0;
523                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
524                         struct sockaddr_in6 *psin6;
525
526                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
527                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
528                                 &psin6->sin6_addr);
529                         /* prior join w/ different source is ok */
530                         if (retv && retv != -EADDRINUSE)
531                                 break;
532                         omode = MCAST_INCLUDE;
533                         add = 1;
534                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
535                         omode = MCAST_INCLUDE;
536                         add = 0;
537                 }
538                 retv = ip6_mc_source(add, omode, sk, &greqs);
539                 break;
540         }
541         case MCAST_MSFILTER:
542         {
543                 extern int sysctl_mld_max_msf;
544                 struct group_filter *gsf;
545
546                 if (optlen < GROUP_FILTER_SIZE(0))
547                         goto e_inval;
548                 if (optlen > sysctl_optmem_max) {
549                         retv = -ENOBUFS;
550                         break;
551                 }
552                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
553                 if (gsf == 0) {
554                         retv = -ENOBUFS;
555                         break;
556                 }
557                 retv = -EFAULT;
558                 if (copy_from_user(gsf, optval, optlen)) {
559                         kfree(gsf);
560                         break;
561                 }
562                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
563                 if (gsf->gf_numsrc >= 0x1ffffffU ||
564                     gsf->gf_numsrc > sysctl_mld_max_msf) {
565                         kfree(gsf);
566                         retv = -ENOBUFS;
567                         break;
568                 }
569                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
570                         kfree(gsf);
571                         retv = -EINVAL;
572                         break;
573                 }
574                 retv = ip6_mc_msfilter(sk, gsf);
575                 kfree(gsf);
576
577                 break;
578         }
579         case IPV6_ROUTER_ALERT:
580                 retv = ip6_ra_control(sk, val, NULL);
581                 break;
582         case IPV6_MTU_DISCOVER:
583                 if (val<0 || val>2)
584                         goto e_inval;
585                 np->pmtudisc = val;
586                 retv = 0;
587                 break;
588         case IPV6_MTU:
589                 if (val && val < IPV6_MIN_MTU)
590                         goto e_inval;
591                 np->frag_size = val;
592                 retv = 0;
593                 break;
594         case IPV6_RECVERR:
595                 np->recverr = valbool;
596                 if (!val)
597                         skb_queue_purge(&sk->sk_error_queue);
598                 retv = 0;
599                 break;
600         case IPV6_FLOWINFO_SEND:
601                 np->sndflow = valbool;
602                 retv = 0;
603                 break;
604         case IPV6_FLOWLABEL_MGR:
605                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
606                 break;
607         case IPV6_IPSEC_POLICY:
608         case IPV6_XFRM_POLICY:
609                 retv = -EPERM;
610                 if (!capable(CAP_NET_ADMIN))
611                         break;
612                 retv = xfrm_user_policy(sk, optname, optval, optlen);
613                 break;
614
615 #ifdef CONFIG_NETFILTER
616         default:
617                 retv = nf_setsockopt(sk, PF_INET6, optname, optval, 
618                                             optlen);
619                 break;
620 #endif
621
622         }
623         release_sock(sk);
624
625 out:
626         return retv;
627
628 e_inval:
629         release_sock(sk);
630         return -EINVAL;
631 }
632
633 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
634                                   char __user *optval, int len)
635 {
636         if (!hdr)
637                 return 0;
638         len = min_t(int, len, ipv6_optlen(hdr));
639         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
640                 return -EFAULT;
641         return len;
642 }
643
644 int ipv6_getsockopt(struct sock *sk, int level, int optname,
645                     char __user *optval, int __user *optlen)
646 {
647         struct ipv6_pinfo *np = inet6_sk(sk);
648         int len;
649         int val;
650
651         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
652                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
653         if(level!=SOL_IPV6)
654                 return -ENOPROTOOPT;
655         if (get_user(len, optlen))
656                 return -EFAULT;
657         switch (optname) {
658         case IPV6_ADDRFORM:
659                 if (sk->sk_protocol != IPPROTO_UDP &&
660                     sk->sk_protocol != IPPROTO_TCP)
661                         return -EINVAL;
662                 if (sk->sk_state != TCP_ESTABLISHED)
663                         return -ENOTCONN;
664                 val = sk->sk_family;
665                 break;
666         case MCAST_MSFILTER:
667         {
668                 struct group_filter gsf;
669                 int err;
670
671                 if (len < GROUP_FILTER_SIZE(0))
672                         return -EINVAL;
673                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
674                         return -EFAULT;
675                 lock_sock(sk);
676                 err = ip6_mc_msfget(sk, &gsf,
677                         (struct group_filter __user *)optval, optlen);
678                 release_sock(sk);
679                 return err;
680         }
681
682         case IPV6_2292PKTOPTIONS:
683         {
684                 struct msghdr msg;
685                 struct sk_buff *skb;
686
687                 if (sk->sk_type != SOCK_STREAM)
688                         return -ENOPROTOOPT;
689
690                 msg.msg_control = optval;
691                 msg.msg_controllen = len;
692                 msg.msg_flags = 0;
693
694                 lock_sock(sk);
695                 skb = np->pktoptions;
696                 if (skb)
697                         atomic_inc(&skb->users);
698                 release_sock(sk);
699
700                 if (skb) {
701                         int err = datagram_recv_ctl(sk, &msg, skb);
702                         kfree_skb(skb);
703                         if (err)
704                                 return err;
705                 } else {
706                         if (np->rxopt.bits.rxinfo) {
707                                 struct in6_pktinfo src_info;
708                                 src_info.ipi6_ifindex = np->mcast_oif;
709                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
710                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
711                         }
712                         if (np->rxopt.bits.rxhlim) {
713                                 int hlim = np->mcast_hops;
714                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
715                         }
716                         if (np->rxopt.bits.rxoinfo) {
717                                 struct in6_pktinfo src_info;
718                                 src_info.ipi6_ifindex = np->mcast_oif;
719                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
720                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
721                         }
722                         if (np->rxopt.bits.rxohlim) {
723                                 int hlim = np->mcast_hops;
724                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
725                         }
726                 }
727                 len -= msg.msg_controllen;
728                 return put_user(len, optlen);
729         }
730         case IPV6_MTU:
731         {
732                 struct dst_entry *dst;
733                 val = 0;        
734                 lock_sock(sk);
735                 dst = sk_dst_get(sk);
736                 if (dst) {
737                         val = dst_mtu(dst);
738                         dst_release(dst);
739                 }
740                 release_sock(sk);
741                 if (!val)
742                         return -ENOTCONN;
743                 break;
744         }
745
746         case IPV6_V6ONLY:
747                 val = np->ipv6only;
748                 break;
749
750         case IPV6_RECVPKTINFO:
751                 val = np->rxopt.bits.rxinfo;
752                 break;
753
754         case IPV6_2292PKTINFO:
755                 val = np->rxopt.bits.rxoinfo;
756                 break;
757
758         case IPV6_RECVHOPLIMIT:
759                 val = np->rxopt.bits.rxhlim;
760                 break;
761
762         case IPV6_2292HOPLIMIT:
763                 val = np->rxopt.bits.rxohlim;
764                 break;
765
766         case IPV6_RECVRTHDR:
767                 val = np->rxopt.bits.srcrt;
768                 break;
769
770         case IPV6_2292RTHDR:
771                 val = np->rxopt.bits.osrcrt;
772                 break;
773
774         case IPV6_HOPOPTS:
775         case IPV6_RTHDRDSTOPTS:
776         case IPV6_RTHDR:
777         case IPV6_DSTOPTS:
778         {
779
780                 lock_sock(sk);
781                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
782                                              optval, len);
783                 release_sock(sk);
784                 return put_user(len, optlen);
785         }
786
787         case IPV6_RECVHOPOPTS:
788                 val = np->rxopt.bits.hopopts;
789                 break;
790
791         case IPV6_2292HOPOPTS:
792                 val = np->rxopt.bits.ohopopts;
793                 break;
794
795         case IPV6_RECVDSTOPTS:
796                 val = np->rxopt.bits.dstopts;
797                 break;
798
799         case IPV6_2292DSTOPTS:
800                 val = np->rxopt.bits.odstopts;
801                 break;
802
803         case IPV6_TCLASS:
804                 val = np->tclass;
805                 break;
806
807         case IPV6_RECVTCLASS:
808                 val = np->rxopt.bits.rxtclass;
809                 break;
810
811         case IPV6_FLOWINFO:
812                 val = np->rxopt.bits.rxflow;
813                 break;
814
815         case IPV6_UNICAST_HOPS:
816                 val = np->hop_limit;
817                 break;
818
819         case IPV6_MULTICAST_HOPS:
820                 val = np->mcast_hops;
821                 break;
822
823         case IPV6_MULTICAST_LOOP:
824                 val = np->mc_loop;
825                 break;
826
827         case IPV6_MULTICAST_IF:
828                 val = np->mcast_oif;
829                 break;
830
831         case IPV6_MTU_DISCOVER:
832                 val = np->pmtudisc;
833                 break;
834
835         case IPV6_RECVERR:
836                 val = np->recverr;
837                 break;
838
839         case IPV6_FLOWINFO_SEND:
840                 val = np->sndflow;
841                 break;
842
843         default:
844 #ifdef CONFIG_NETFILTER
845                 lock_sock(sk);
846                 val = nf_getsockopt(sk, PF_INET6, optname, optval, 
847                                     &len);
848                 release_sock(sk);
849                 if (val >= 0)
850                         val = put_user(len, optlen);
851                 return val;
852 #else
853                 return -EINVAL;
854 #endif
855         }
856         len = min_t(unsigned int, sizeof(int), len);
857         if(put_user(len, optlen))
858                 return -EFAULT;
859         if(copy_to_user(optval,&val,len))
860                 return -EFAULT;
861         return 0;
862 }
863
864 void __init ipv6_packet_init(void)
865 {
866         dev_add_pack(&ipv6_packet_type);
867 }
868
869 void ipv6_packet_cleanup(void)
870 {
871         dev_remove_pack(&ipv6_packet_type);
872 }