Merge master.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild
[linux-2.6] / 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 tcp_sock *tp = tcp_sk(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                                 tp->af_specific = &ipv4_specific;
174                                 sk->sk_socket->ops = &inet_stream_ops;
175                                 sk->sk_family = PF_INET;
176                                 tcp_sync_mss(sk, tp->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 = 0;
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 (sk->sk_type == SOCK_STREAM) {
321                         if (opt) {
322                                 struct tcp_sock *tp = tcp_sk(sk);
323                                 if (!((1 << sk->sk_state) &
324                                       (TCPF_LISTEN | TCPF_CLOSE))
325                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
326                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
327                                         tcp_sync_mss(sk, tp->pmtu_cookie);
328                                 }
329                         }
330                         opt = xchg(&np->opt, opt);
331                         sk_dst_reset(sk);
332                 } else {
333                         write_lock(&sk->sk_dst_lock);
334                         opt = xchg(&np->opt, opt);
335                         write_unlock(&sk->sk_dst_lock);
336                         sk_dst_reset(sk);
337                 }
338 sticky_done:
339                 if (opt)
340                         sock_kfree_s(sk, opt, opt->tot_len);
341                 break;
342         }
343
344         case IPV6_2292PKTOPTIONS:
345         {
346                 struct ipv6_txoptions *opt = NULL;
347                 struct msghdr msg;
348                 struct flowi fl;
349                 int junk;
350
351                 fl.fl6_flowlabel = 0;
352                 fl.oif = sk->sk_bound_dev_if;
353
354                 if (optlen == 0)
355                         goto update;
356
357                 /* 1K is probably excessive
358                  * 1K is surely not enough, 2K per standard header is 16K.
359                  */
360                 retv = -EINVAL;
361                 if (optlen > 64*1024)
362                         break;
363
364                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
365                 retv = -ENOBUFS;
366                 if (opt == NULL)
367                         break;
368
369                 memset(opt, 0, sizeof(*opt));
370                 opt->tot_len = sizeof(*opt) + optlen;
371                 retv = -EFAULT;
372                 if (copy_from_user(opt+1, optval, optlen))
373                         goto done;
374
375                 msg.msg_controllen = optlen;
376                 msg.msg_control = (void*)(opt+1);
377
378                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
379                 if (retv)
380                         goto done;
381 update:
382                 retv = 0;
383                 if (sk->sk_type == SOCK_STREAM) {
384                         if (opt) {
385                                 struct tcp_sock *tp = tcp_sk(sk);
386                                 if (!((1 << sk->sk_state) &
387                                       (TCPF_LISTEN | TCPF_CLOSE))
388                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
389                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
390                                         tcp_sync_mss(sk, tp->pmtu_cookie);
391                                 }
392                         }
393                         opt = xchg(&np->opt, opt);
394                         sk_dst_reset(sk);
395                 } else {
396                         write_lock(&sk->sk_dst_lock);
397                         opt = xchg(&np->opt, opt);
398                         write_unlock(&sk->sk_dst_lock);
399                         sk_dst_reset(sk);
400                 }
401
402 done:
403                 if (opt)
404                         sock_kfree_s(sk, opt, opt->tot_len);
405                 break;
406         }
407         case IPV6_UNICAST_HOPS:
408                 if (val > 255 || val < -1)
409                         goto e_inval;
410                 np->hop_limit = val;
411                 retv = 0;
412                 break;
413
414         case IPV6_MULTICAST_HOPS:
415                 if (sk->sk_type == SOCK_STREAM)
416                         goto e_inval;
417                 if (val > 255 || val < -1)
418                         goto e_inval;
419                 np->mcast_hops = val;
420                 retv = 0;
421                 break;
422
423         case IPV6_MULTICAST_LOOP:
424                 np->mc_loop = valbool;
425                 retv = 0;
426                 break;
427
428         case IPV6_MULTICAST_IF:
429                 if (sk->sk_type == SOCK_STREAM)
430                         goto e_inval;
431                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
432                         goto e_inval;
433
434                 if (__dev_get_by_index(val) == NULL) {
435                         retv = -ENODEV;
436                         break;
437                 }
438                 np->mcast_oif = val;
439                 retv = 0;
440                 break;
441         case IPV6_ADD_MEMBERSHIP:
442         case IPV6_DROP_MEMBERSHIP:
443         {
444                 struct ipv6_mreq mreq;
445
446                 retv = -EFAULT;
447                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
448                         break;
449
450                 if (optname == IPV6_ADD_MEMBERSHIP)
451                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
452                 else
453                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
454                 break;
455         }
456         case IPV6_JOIN_ANYCAST:
457         case IPV6_LEAVE_ANYCAST:
458         {
459                 struct ipv6_mreq mreq;
460
461                 if (optlen != sizeof(struct ipv6_mreq))
462                         goto e_inval;
463
464                 retv = -EFAULT;
465                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
466                         break;
467
468                 if (optname == IPV6_JOIN_ANYCAST)
469                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
470                 else
471                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
472                 break;
473         }
474         case MCAST_JOIN_GROUP:
475         case MCAST_LEAVE_GROUP:
476         {
477                 struct group_req greq;
478                 struct sockaddr_in6 *psin6;
479
480                 retv = -EFAULT;
481                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
482                         break;
483                 if (greq.gr_group.ss_family != AF_INET6) {
484                         retv = -EADDRNOTAVAIL;
485                         break;
486                 }
487                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
488                 if (optname == MCAST_JOIN_GROUP)
489                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
490                                 &psin6->sin6_addr);
491                 else
492                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
493                                 &psin6->sin6_addr);
494                 break;
495         }
496         case MCAST_JOIN_SOURCE_GROUP:
497         case MCAST_LEAVE_SOURCE_GROUP:
498         case MCAST_BLOCK_SOURCE:
499         case MCAST_UNBLOCK_SOURCE:
500         {
501                 struct group_source_req greqs;
502                 int omode, add;
503
504                 if (optlen != sizeof(struct group_source_req))
505                         goto e_inval;
506                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
507                         retv = -EFAULT;
508                         break;
509                 }
510                 if (greqs.gsr_group.ss_family != AF_INET6 ||
511                     greqs.gsr_source.ss_family != AF_INET6) {
512                         retv = -EADDRNOTAVAIL;
513                         break;
514                 }
515                 if (optname == MCAST_BLOCK_SOURCE) {
516                         omode = MCAST_EXCLUDE;
517                         add = 1;
518                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
519                         omode = MCAST_EXCLUDE;
520                         add = 0;
521                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
522                         struct sockaddr_in6 *psin6;
523
524                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
525                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
526                                 &psin6->sin6_addr);
527                         /* prior join w/ different source is ok */
528                         if (retv && retv != -EADDRINUSE)
529                                 break;
530                         omode = MCAST_INCLUDE;
531                         add = 1;
532                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
533                         omode = MCAST_INCLUDE;
534                         add = 0;
535                 }
536                 retv = ip6_mc_source(add, omode, sk, &greqs);
537                 break;
538         }
539         case MCAST_MSFILTER:
540         {
541                 extern int sysctl_mld_max_msf;
542                 struct group_filter *gsf;
543
544                 if (optlen < GROUP_FILTER_SIZE(0))
545                         goto e_inval;
546                 if (optlen > sysctl_optmem_max) {
547                         retv = -ENOBUFS;
548                         break;
549                 }
550                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
551                 if (gsf == 0) {
552                         retv = -ENOBUFS;
553                         break;
554                 }
555                 retv = -EFAULT;
556                 if (copy_from_user(gsf, optval, optlen)) {
557                         kfree(gsf);
558                         break;
559                 }
560                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
561                 if (gsf->gf_numsrc >= 0x1ffffffU ||
562                     gsf->gf_numsrc > sysctl_mld_max_msf) {
563                         kfree(gsf);
564                         retv = -ENOBUFS;
565                         break;
566                 }
567                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
568                         kfree(gsf);
569                         retv = -EINVAL;
570                         break;
571                 }
572                 retv = ip6_mc_msfilter(sk, gsf);
573                 kfree(gsf);
574
575                 break;
576         }
577         case IPV6_ROUTER_ALERT:
578                 retv = ip6_ra_control(sk, val, NULL);
579                 break;
580         case IPV6_MTU_DISCOVER:
581                 if (val<0 || val>2)
582                         goto e_inval;
583                 np->pmtudisc = val;
584                 retv = 0;
585                 break;
586         case IPV6_MTU:
587                 if (val && val < IPV6_MIN_MTU)
588                         goto e_inval;
589                 np->frag_size = val;
590                 retv = 0;
591                 break;
592         case IPV6_RECVERR:
593                 np->recverr = valbool;
594                 if (!val)
595                         skb_queue_purge(&sk->sk_error_queue);
596                 retv = 0;
597                 break;
598         case IPV6_FLOWINFO_SEND:
599                 np->sndflow = valbool;
600                 retv = 0;
601                 break;
602         case IPV6_FLOWLABEL_MGR:
603                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
604                 break;
605         case IPV6_IPSEC_POLICY:
606         case IPV6_XFRM_POLICY:
607                 retv = -EPERM;
608                 if (!capable(CAP_NET_ADMIN))
609                         break;
610                 retv = xfrm_user_policy(sk, optname, optval, optlen);
611                 break;
612
613 #ifdef CONFIG_NETFILTER
614         default:
615                 retv = nf_setsockopt(sk, PF_INET6, optname, optval, 
616                                             optlen);
617                 break;
618 #endif
619
620         }
621         release_sock(sk);
622
623 out:
624         return retv;
625
626 e_inval:
627         release_sock(sk);
628         return -EINVAL;
629 }
630
631 int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
632                            char __user *optval, int len)
633 {
634         if (!hdr)
635                 return 0;
636         len = min_t(int, len, ipv6_optlen(hdr));
637         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
638                 return -EFAULT;
639         return len;
640 }
641
642 int ipv6_getsockopt(struct sock *sk, int level, int optname,
643                     char __user *optval, int __user *optlen)
644 {
645         struct ipv6_pinfo *np = inet6_sk(sk);
646         int len;
647         int val;
648
649         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
650                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
651         if(level!=SOL_IPV6)
652                 return -ENOPROTOOPT;
653         if (get_user(len, optlen))
654                 return -EFAULT;
655         switch (optname) {
656         case IPV6_ADDRFORM:
657                 if (sk->sk_protocol != IPPROTO_UDP &&
658                     sk->sk_protocol != IPPROTO_TCP)
659                         return -EINVAL;
660                 if (sk->sk_state != TCP_ESTABLISHED)
661                         return -ENOTCONN;
662                 val = sk->sk_family;
663                 break;
664         case MCAST_MSFILTER:
665         {
666                 struct group_filter gsf;
667                 int err;
668
669                 if (len < GROUP_FILTER_SIZE(0))
670                         return -EINVAL;
671                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
672                         return -EFAULT;
673                 lock_sock(sk);
674                 err = ip6_mc_msfget(sk, &gsf,
675                         (struct group_filter __user *)optval, optlen);
676                 release_sock(sk);
677                 return err;
678         }
679
680         case IPV6_2292PKTOPTIONS:
681         {
682                 struct msghdr msg;
683                 struct sk_buff *skb;
684
685                 if (sk->sk_type != SOCK_STREAM)
686                         return -ENOPROTOOPT;
687
688                 msg.msg_control = optval;
689                 msg.msg_controllen = len;
690                 msg.msg_flags = 0;
691
692                 lock_sock(sk);
693                 skb = np->pktoptions;
694                 if (skb)
695                         atomic_inc(&skb->users);
696                 release_sock(sk);
697
698                 if (skb) {
699                         int err = datagram_recv_ctl(sk, &msg, skb);
700                         kfree_skb(skb);
701                         if (err)
702                                 return err;
703                 } else {
704                         if (np->rxopt.bits.rxinfo) {
705                                 struct in6_pktinfo src_info;
706                                 src_info.ipi6_ifindex = np->mcast_oif;
707                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
708                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
709                         }
710                         if (np->rxopt.bits.rxhlim) {
711                                 int hlim = np->mcast_hops;
712                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
713                         }
714                         if (np->rxopt.bits.rxoinfo) {
715                                 struct in6_pktinfo src_info;
716                                 src_info.ipi6_ifindex = np->mcast_oif;
717                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
718                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
719                         }
720                         if (np->rxopt.bits.rxohlim) {
721                                 int hlim = np->mcast_hops;
722                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
723                         }
724                 }
725                 len -= msg.msg_controllen;
726                 return put_user(len, optlen);
727         }
728         case IPV6_MTU:
729         {
730                 struct dst_entry *dst;
731                 val = 0;        
732                 lock_sock(sk);
733                 dst = sk_dst_get(sk);
734                 if (dst) {
735                         val = dst_mtu(dst);
736                         dst_release(dst);
737                 }
738                 release_sock(sk);
739                 if (!val)
740                         return -ENOTCONN;
741                 break;
742         }
743
744         case IPV6_V6ONLY:
745                 val = np->ipv6only;
746                 break;
747
748         case IPV6_RECVPKTINFO:
749                 val = np->rxopt.bits.rxinfo;
750                 break;
751
752         case IPV6_2292PKTINFO:
753                 val = np->rxopt.bits.rxoinfo;
754                 break;
755
756         case IPV6_RECVHOPLIMIT:
757                 val = np->rxopt.bits.rxhlim;
758                 break;
759
760         case IPV6_2292HOPLIMIT:
761                 val = np->rxopt.bits.rxohlim;
762                 break;
763
764         case IPV6_RECVRTHDR:
765                 val = np->rxopt.bits.srcrt;
766                 break;
767
768         case IPV6_2292RTHDR:
769                 val = np->rxopt.bits.osrcrt;
770                 break;
771
772         case IPV6_HOPOPTS:
773         case IPV6_RTHDRDSTOPTS:
774         case IPV6_RTHDR:
775         case IPV6_DSTOPTS:
776         {
777
778                 lock_sock(sk);
779                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
780                                              optval, len);
781                 release_sock(sk);
782                 return put_user(len, optlen);
783         }
784
785         case IPV6_RECVHOPOPTS:
786                 val = np->rxopt.bits.hopopts;
787                 break;
788
789         case IPV6_2292HOPOPTS:
790                 val = np->rxopt.bits.ohopopts;
791                 break;
792
793         case IPV6_RECVDSTOPTS:
794                 val = np->rxopt.bits.dstopts;
795                 break;
796
797         case IPV6_2292DSTOPTS:
798                 val = np->rxopt.bits.odstopts;
799                 break;
800
801         case IPV6_TCLASS:
802                 val = np->tclass;
803                 break;
804
805         case IPV6_RECVTCLASS:
806                 val = np->rxopt.bits.rxtclass;
807                 break;
808
809         case IPV6_FLOWINFO:
810                 val = np->rxopt.bits.rxflow;
811                 break;
812
813         case IPV6_UNICAST_HOPS:
814                 val = np->hop_limit;
815                 break;
816
817         case IPV6_MULTICAST_HOPS:
818                 val = np->mcast_hops;
819                 break;
820
821         case IPV6_MULTICAST_LOOP:
822                 val = np->mc_loop;
823                 break;
824
825         case IPV6_MULTICAST_IF:
826                 val = np->mcast_oif;
827                 break;
828
829         case IPV6_MTU_DISCOVER:
830                 val = np->pmtudisc;
831                 break;
832
833         case IPV6_RECVERR:
834                 val = np->recverr;
835                 break;
836
837         case IPV6_FLOWINFO_SEND:
838                 val = np->sndflow;
839                 break;
840
841         default:
842 #ifdef CONFIG_NETFILTER
843                 lock_sock(sk);
844                 val = nf_getsockopt(sk, PF_INET6, optname, optval, 
845                                     &len);
846                 release_sock(sk);
847                 if (val >= 0)
848                         val = put_user(len, optlen);
849                 return val;
850 #else
851                 return -EINVAL;
852 #endif
853         }
854         len = min_t(unsigned int, sizeof(int), len);
855         if(put_user(len, optlen))
856                 return -EFAULT;
857         if(copy_to_user(optval,&val,len))
858                 return -EFAULT;
859         return 0;
860 }
861
862 void __init ipv6_packet_init(void)
863 {
864         dev_add_pack(&ipv6_packet_type);
865 }
866
867 void ipv6_packet_cleanup(void)
868 {
869         dev_remove_pack(&ipv6_packet_type);
870 }