ipv6 mcast: Check address family of gf_group in getsockopt(MS_FILTER).
[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       Truncate getsockopt returns
20  *      o       Return an optlen of the truncated length if need be
21  *
22  *      Changes:
23  *      David L Stevens <dlstevens@us.ibm.com>:
24  *              - added multicast source filtering API for MLDv2
25  */
26
27 #include <linux/module.h>
28 #include <linux/capability.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/mroute6.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/init.h>
39 #include <linux/sysctl.h>
40 #include <linux/netfilter.h>
41
42 #include <net/sock.h>
43 #include <net/snmp.h>
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/inet_common.h>
51 #include <net/tcp.h>
52 #include <net/udp.h>
53 #include <net/udplite.h>
54 #include <net/xfrm.h>
55 #include <net/compat.h>
56
57 #include <asm/uaccess.h>
58
59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
60
61 struct ip6_ra_chain *ip6_ra_chain;
62 DEFINE_RWLOCK(ip6_ra_lock);
63
64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
65 {
66         struct ip6_ra_chain *ra, *new_ra, **rap;
67
68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
70                 return -EINVAL;
71
72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
73
74         write_lock_bh(&ip6_ra_lock);
75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
76                 if (ra->sk == sk) {
77                         if (sel>=0) {
78                                 write_unlock_bh(&ip6_ra_lock);
79                                 kfree(new_ra);
80                                 return -EADDRINUSE;
81                         }
82
83                         *rap = ra->next;
84                         write_unlock_bh(&ip6_ra_lock);
85
86                         if (ra->destructor)
87                                 ra->destructor(sk);
88                         sock_put(sk);
89                         kfree(ra);
90                         return 0;
91                 }
92         }
93         if (new_ra == NULL) {
94                 write_unlock_bh(&ip6_ra_lock);
95                 return -ENOBUFS;
96         }
97         new_ra->sk = sk;
98         new_ra->sel = sel;
99         new_ra->destructor = destructor;
100         new_ra->next = ra;
101         *rap = new_ra;
102         sock_hold(sk);
103         write_unlock_bh(&ip6_ra_lock);
104         return 0;
105 }
106
107 static
108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
109                                            struct ipv6_txoptions *opt)
110 {
111         if (inet_sk(sk)->is_icsk) {
112                 if (opt &&
113                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
114                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
115                         struct inet_connection_sock *icsk = inet_csk(sk);
116                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
117                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
118                 }
119                 opt = xchg(&inet6_sk(sk)->opt, opt);
120         } else {
121                 write_lock(&sk->sk_dst_lock);
122                 opt = xchg(&inet6_sk(sk)->opt, opt);
123                 write_unlock(&sk->sk_dst_lock);
124         }
125         sk_dst_reset(sk);
126
127         return opt;
128 }
129
130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
131                     char __user *optval, int optlen)
132 {
133         struct ipv6_pinfo *np = inet6_sk(sk);
134         struct net *net = sock_net(sk);
135         int val, valbool;
136         int retv = -ENOPROTOOPT;
137
138         if (optval == NULL)
139                 val=0;
140         else {
141                 if (optlen >= sizeof(int)) {
142                         if (get_user(val, (int __user *) optval))
143                                 return -EFAULT;
144                 } else
145                         val = 0;
146         }
147
148         valbool = (val!=0);
149
150         if (ip6_mroute_opt(optname))
151                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
152
153         lock_sock(sk);
154
155         switch (optname) {
156
157         case IPV6_ADDRFORM:
158                 if (optlen < sizeof(int))
159                         goto e_inval;
160                 if (val == PF_INET) {
161                         struct ipv6_txoptions *opt;
162                         struct sk_buff *pktopt;
163
164                         if (sk->sk_type == SOCK_RAW)
165                                 break;
166
167                         if (sk->sk_protocol == IPPROTO_UDP ||
168                             sk->sk_protocol == IPPROTO_UDPLITE) {
169                                 struct udp_sock *up = udp_sk(sk);
170                                 if (up->pending == AF_INET6) {
171                                         retv = -EBUSY;
172                                         break;
173                                 }
174                         } else if (sk->sk_protocol != IPPROTO_TCP)
175                                 break;
176
177                         if (sk->sk_state != TCP_ESTABLISHED) {
178                                 retv = -ENOTCONN;
179                                 break;
180                         }
181
182                         if (ipv6_only_sock(sk) ||
183                             !ipv6_addr_v4mapped(&np->daddr)) {
184                                 retv = -EADDRNOTAVAIL;
185                                 break;
186                         }
187
188                         fl6_free_socklist(sk);
189                         ipv6_sock_mc_close(sk);
190
191                         /*
192                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
193                          * remove it from the refcnt debug socks count in the
194                          * original family...
195                          */
196                         sk_refcnt_debug_dec(sk);
197
198                         if (sk->sk_protocol == IPPROTO_TCP) {
199                                 struct inet_connection_sock *icsk = inet_csk(sk);
200                                 local_bh_disable();
201                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
202                                 sock_prot_inuse_add(net, &tcp_prot, 1);
203                                 local_bh_enable();
204                                 sk->sk_prot = &tcp_prot;
205                                 icsk->icsk_af_ops = &ipv4_specific;
206                                 sk->sk_socket->ops = &inet_stream_ops;
207                                 sk->sk_family = PF_INET;
208                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
209                         } else {
210                                 struct proto *prot = &udp_prot;
211
212                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
213                                         prot = &udplite_prot;
214                                 local_bh_disable();
215                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
216                                 sock_prot_inuse_add(net, prot, 1);
217                                 local_bh_enable();
218                                 sk->sk_prot = prot;
219                                 sk->sk_socket->ops = &inet_dgram_ops;
220                                 sk->sk_family = PF_INET;
221                         }
222                         opt = xchg(&np->opt, NULL);
223                         if (opt)
224                                 sock_kfree_s(sk, opt, opt->tot_len);
225                         pktopt = xchg(&np->pktoptions, NULL);
226                         if (pktopt)
227                                 kfree_skb(pktopt);
228
229                         sk->sk_destruct = inet_sock_destruct;
230                         /*
231                          * ... and add it to the refcnt debug socks count
232                          * in the new family. -acme
233                          */
234                         sk_refcnt_debug_inc(sk);
235                         module_put(THIS_MODULE);
236                         retv = 0;
237                         break;
238                 }
239                 goto e_inval;
240
241         case IPV6_V6ONLY:
242                 if (optlen < sizeof(int) ||
243                     inet_sk(sk)->num)
244                         goto e_inval;
245                 np->ipv6only = valbool;
246                 retv = 0;
247                 break;
248
249         case IPV6_RECVPKTINFO:
250                 if (optlen < sizeof(int))
251                         goto e_inval;
252                 np->rxopt.bits.rxinfo = valbool;
253                 retv = 0;
254                 break;
255
256         case IPV6_2292PKTINFO:
257                 if (optlen < sizeof(int))
258                         goto e_inval;
259                 np->rxopt.bits.rxoinfo = valbool;
260                 retv = 0;
261                 break;
262
263         case IPV6_RECVHOPLIMIT:
264                 if (optlen < sizeof(int))
265                         goto e_inval;
266                 np->rxopt.bits.rxhlim = valbool;
267                 retv = 0;
268                 break;
269
270         case IPV6_2292HOPLIMIT:
271                 if (optlen < sizeof(int))
272                         goto e_inval;
273                 np->rxopt.bits.rxohlim = valbool;
274                 retv = 0;
275                 break;
276
277         case IPV6_RECVRTHDR:
278                 if (optlen < sizeof(int))
279                         goto e_inval;
280                 np->rxopt.bits.srcrt = valbool;
281                 retv = 0;
282                 break;
283
284         case IPV6_2292RTHDR:
285                 if (optlen < sizeof(int))
286                         goto e_inval;
287                 np->rxopt.bits.osrcrt = valbool;
288                 retv = 0;
289                 break;
290
291         case IPV6_RECVHOPOPTS:
292                 if (optlen < sizeof(int))
293                         goto e_inval;
294                 np->rxopt.bits.hopopts = valbool;
295                 retv = 0;
296                 break;
297
298         case IPV6_2292HOPOPTS:
299                 if (optlen < sizeof(int))
300                         goto e_inval;
301                 np->rxopt.bits.ohopopts = valbool;
302                 retv = 0;
303                 break;
304
305         case IPV6_RECVDSTOPTS:
306                 if (optlen < sizeof(int))
307                         goto e_inval;
308                 np->rxopt.bits.dstopts = valbool;
309                 retv = 0;
310                 break;
311
312         case IPV6_2292DSTOPTS:
313                 if (optlen < sizeof(int))
314                         goto e_inval;
315                 np->rxopt.bits.odstopts = valbool;
316                 retv = 0;
317                 break;
318
319         case IPV6_TCLASS:
320                 if (optlen < sizeof(int))
321                         goto e_inval;
322                 if (val < -1 || val > 0xff)
323                         goto e_inval;
324                 np->tclass = val;
325                 retv = 0;
326                 break;
327
328         case IPV6_RECVTCLASS:
329                 if (optlen < sizeof(int))
330                         goto e_inval;
331                 np->rxopt.bits.rxtclass = valbool;
332                 retv = 0;
333                 break;
334
335         case IPV6_FLOWINFO:
336                 if (optlen < sizeof(int))
337                         goto e_inval;
338                 np->rxopt.bits.rxflow = valbool;
339                 retv = 0;
340                 break;
341
342         case IPV6_HOPOPTS:
343         case IPV6_RTHDRDSTOPTS:
344         case IPV6_RTHDR:
345         case IPV6_DSTOPTS:
346         {
347                 struct ipv6_txoptions *opt;
348                 if (optlen == 0)
349                         optval = NULL;
350
351                 /* hop-by-hop / destination options are privileged option */
352                 retv = -EPERM;
353                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
354                         break;
355
356                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
357                     optlen & 0x7 || optlen > 8 * 255)
358                         goto e_inval;
359
360                 opt = ipv6_renew_options(sk, np->opt, optname,
361                                          (struct ipv6_opt_hdr __user *)optval,
362                                          optlen);
363                 if (IS_ERR(opt)) {
364                         retv = PTR_ERR(opt);
365                         break;
366                 }
367
368                 /* routing header option needs extra check */
369                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
370                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
371                         switch (rthdr->type) {
372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
373                         case IPV6_SRCRT_TYPE_2:
374                                 break;
375 #endif
376                         default:
377                                 goto sticky_done;
378                         }
379
380                         if ((rthdr->hdrlen & 1) ||
381                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
382                                 goto sticky_done;
383                 }
384
385                 retv = 0;
386                 opt = ipv6_update_options(sk, opt);
387 sticky_done:
388                 if (opt)
389                         sock_kfree_s(sk, opt, opt->tot_len);
390                 break;
391         }
392
393         case IPV6_2292PKTOPTIONS:
394         {
395                 struct ipv6_txoptions *opt = NULL;
396                 struct msghdr msg;
397                 struct flowi fl;
398                 int junk;
399
400                 fl.fl6_flowlabel = 0;
401                 fl.oif = sk->sk_bound_dev_if;
402
403                 if (optlen == 0)
404                         goto update;
405
406                 /* 1K is probably excessive
407                  * 1K is surely not enough, 2K per standard header is 16K.
408                  */
409                 retv = -EINVAL;
410                 if (optlen > 64*1024)
411                         break;
412
413                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
414                 retv = -ENOBUFS;
415                 if (opt == NULL)
416                         break;
417
418                 memset(opt, 0, sizeof(*opt));
419                 opt->tot_len = sizeof(*opt) + optlen;
420                 retv = -EFAULT;
421                 if (copy_from_user(opt+1, optval, optlen))
422                         goto done;
423
424                 msg.msg_controllen = optlen;
425                 msg.msg_control = (void*)(opt+1);
426
427                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
428                 if (retv)
429                         goto done;
430 update:
431                 retv = 0;
432                 opt = ipv6_update_options(sk, opt);
433 done:
434                 if (opt)
435                         sock_kfree_s(sk, opt, opt->tot_len);
436                 break;
437         }
438         case IPV6_UNICAST_HOPS:
439                 if (optlen < sizeof(int))
440                         goto e_inval;
441                 if (val > 255 || val < -1)
442                         goto e_inval;
443                 np->hop_limit = val;
444                 retv = 0;
445                 break;
446
447         case IPV6_MULTICAST_HOPS:
448                 if (sk->sk_type == SOCK_STREAM)
449                         goto e_inval;
450                 if (optlen < sizeof(int))
451                         goto e_inval;
452                 if (val > 255 || val < -1)
453                         goto e_inval;
454                 np->mcast_hops = val;
455                 retv = 0;
456                 break;
457
458         case IPV6_MULTICAST_LOOP:
459                 if (optlen < sizeof(int))
460                         goto e_inval;
461                 np->mc_loop = valbool;
462                 retv = 0;
463                 break;
464
465         case IPV6_MULTICAST_IF:
466                 if (sk->sk_type == SOCK_STREAM)
467                         goto e_inval;
468                 if (optlen < sizeof(int))
469                         goto e_inval;
470
471                 if (val) {
472                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
473                                 goto e_inval;
474
475                         if (__dev_get_by_index(net, val) == NULL) {
476                                 retv = -ENODEV;
477                                 break;
478                         }
479                 }
480                 np->mcast_oif = val;
481                 retv = 0;
482                 break;
483         case IPV6_ADD_MEMBERSHIP:
484         case IPV6_DROP_MEMBERSHIP:
485         {
486                 struct ipv6_mreq mreq;
487
488                 if (optlen < sizeof(struct ipv6_mreq))
489                         goto e_inval;
490
491                 retv = -EPROTO;
492                 if (inet_sk(sk)->is_icsk)
493                         break;
494
495                 retv = -EFAULT;
496                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
497                         break;
498
499                 if (optname == IPV6_ADD_MEMBERSHIP)
500                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
501                 else
502                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
503                 break;
504         }
505         case IPV6_JOIN_ANYCAST:
506         case IPV6_LEAVE_ANYCAST:
507         {
508                 struct ipv6_mreq mreq;
509
510                 if (optlen < sizeof(struct ipv6_mreq))
511                         goto e_inval;
512
513                 retv = -EFAULT;
514                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
515                         break;
516
517                 if (optname == IPV6_JOIN_ANYCAST)
518                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
519                 else
520                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
521                 break;
522         }
523         case MCAST_JOIN_GROUP:
524         case MCAST_LEAVE_GROUP:
525         {
526                 struct group_req greq;
527                 struct sockaddr_in6 *psin6;
528
529                 if (optlen < sizeof(struct group_req))
530                         goto e_inval;
531
532                 retv = -EFAULT;
533                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
534                         break;
535                 if (greq.gr_group.ss_family != AF_INET6) {
536                         retv = -EADDRNOTAVAIL;
537                         break;
538                 }
539                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
540                 if (optname == MCAST_JOIN_GROUP)
541                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
542                                 &psin6->sin6_addr);
543                 else
544                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
545                                 &psin6->sin6_addr);
546                 break;
547         }
548         case MCAST_JOIN_SOURCE_GROUP:
549         case MCAST_LEAVE_SOURCE_GROUP:
550         case MCAST_BLOCK_SOURCE:
551         case MCAST_UNBLOCK_SOURCE:
552         {
553                 struct group_source_req greqs;
554                 int omode, add;
555
556                 if (optlen < sizeof(struct group_source_req))
557                         goto e_inval;
558                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
559                         retv = -EFAULT;
560                         break;
561                 }
562                 if (greqs.gsr_group.ss_family != AF_INET6 ||
563                     greqs.gsr_source.ss_family != AF_INET6) {
564                         retv = -EADDRNOTAVAIL;
565                         break;
566                 }
567                 if (optname == MCAST_BLOCK_SOURCE) {
568                         omode = MCAST_EXCLUDE;
569                         add = 1;
570                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
571                         omode = MCAST_EXCLUDE;
572                         add = 0;
573                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
574                         struct sockaddr_in6 *psin6;
575
576                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
577                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
578                                 &psin6->sin6_addr);
579                         /* prior join w/ different source is ok */
580                         if (retv && retv != -EADDRINUSE)
581                                 break;
582                         omode = MCAST_INCLUDE;
583                         add = 1;
584                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
585                         omode = MCAST_INCLUDE;
586                         add = 0;
587                 }
588                 retv = ip6_mc_source(add, omode, sk, &greqs);
589                 break;
590         }
591         case MCAST_MSFILTER:
592         {
593                 extern int sysctl_mld_max_msf;
594                 struct group_filter *gsf;
595
596                 if (optlen < GROUP_FILTER_SIZE(0))
597                         goto e_inval;
598                 if (optlen > sysctl_optmem_max) {
599                         retv = -ENOBUFS;
600                         break;
601                 }
602                 gsf = kmalloc(optlen,GFP_KERNEL);
603                 if (!gsf) {
604                         retv = -ENOBUFS;
605                         break;
606                 }
607                 retv = -EFAULT;
608                 if (copy_from_user(gsf, optval, optlen)) {
609                         kfree(gsf);
610                         break;
611                 }
612                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
613                 if (gsf->gf_numsrc >= 0x1ffffffU ||
614                     gsf->gf_numsrc > sysctl_mld_max_msf) {
615                         kfree(gsf);
616                         retv = -ENOBUFS;
617                         break;
618                 }
619                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
620                         kfree(gsf);
621                         retv = -EINVAL;
622                         break;
623                 }
624                 retv = ip6_mc_msfilter(sk, gsf);
625                 kfree(gsf);
626
627                 break;
628         }
629         case IPV6_ROUTER_ALERT:
630                 if (optlen < sizeof(int))
631                         goto e_inval;
632                 retv = ip6_ra_control(sk, val, NULL);
633                 break;
634         case IPV6_MTU_DISCOVER:
635                 if (optlen < sizeof(int))
636                         goto e_inval;
637                 if (val<0 || val>3)
638                         goto e_inval;
639                 np->pmtudisc = val;
640                 retv = 0;
641                 break;
642         case IPV6_MTU:
643                 if (optlen < sizeof(int))
644                         goto e_inval;
645                 if (val && val < IPV6_MIN_MTU)
646                         goto e_inval;
647                 np->frag_size = val;
648                 retv = 0;
649                 break;
650         case IPV6_RECVERR:
651                 if (optlen < sizeof(int))
652                         goto e_inval;
653                 np->recverr = valbool;
654                 if (!val)
655                         skb_queue_purge(&sk->sk_error_queue);
656                 retv = 0;
657                 break;
658         case IPV6_FLOWINFO_SEND:
659                 if (optlen < sizeof(int))
660                         goto e_inval;
661                 np->sndflow = valbool;
662                 retv = 0;
663                 break;
664         case IPV6_FLOWLABEL_MGR:
665                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
666                 break;
667         case IPV6_IPSEC_POLICY:
668         case IPV6_XFRM_POLICY:
669                 retv = -EPERM;
670                 if (!capable(CAP_NET_ADMIN))
671                         break;
672                 retv = xfrm_user_policy(sk, optname, optval, optlen);
673                 break;
674
675         case IPV6_ADDR_PREFERENCES:
676             {
677                 unsigned int pref = 0;
678                 unsigned int prefmask = ~0;
679
680                 if (optlen < sizeof(int))
681                         goto e_inval;
682
683                 retv = -EINVAL;
684
685                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
686                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
687                                IPV6_PREFER_SRC_TMP|
688                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
689                 case IPV6_PREFER_SRC_PUBLIC:
690                         pref |= IPV6_PREFER_SRC_PUBLIC;
691                         break;
692                 case IPV6_PREFER_SRC_TMP:
693                         pref |= IPV6_PREFER_SRC_TMP;
694                         break;
695                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
696                         break;
697                 case 0:
698                         goto pref_skip_pubtmp;
699                 default:
700                         goto e_inval;
701                 }
702
703                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
704                               IPV6_PREFER_SRC_TMP);
705 pref_skip_pubtmp:
706
707                 /* check HOME/COA conflicts */
708                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
709                 case IPV6_PREFER_SRC_HOME:
710                         break;
711                 case IPV6_PREFER_SRC_COA:
712                         pref |= IPV6_PREFER_SRC_COA;
713                 case 0:
714                         goto pref_skip_coa;
715                 default:
716                         goto e_inval;
717                 }
718
719                 prefmask &= ~IPV6_PREFER_SRC_COA;
720 pref_skip_coa:
721
722                 /* check CGA/NONCGA conflicts */
723                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
724                 case IPV6_PREFER_SRC_CGA:
725                 case IPV6_PREFER_SRC_NONCGA:
726                 case 0:
727                         break;
728                 default:
729                         goto e_inval;
730                 }
731
732                 np->srcprefs = (np->srcprefs & prefmask) | pref;
733                 retv = 0;
734
735                 break;
736             }
737         }
738
739         release_sock(sk);
740
741         return retv;
742
743 e_inval:
744         release_sock(sk);
745         return -EINVAL;
746 }
747
748 int ipv6_setsockopt(struct sock *sk, int level, int optname,
749                     char __user *optval, int optlen)
750 {
751         int err;
752
753         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
754                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
755
756         if (level != SOL_IPV6)
757                 return -ENOPROTOOPT;
758
759         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
760 #ifdef CONFIG_NETFILTER
761         /* we need to exclude all possible ENOPROTOOPTs except default case */
762         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
763                         optname != IPV6_XFRM_POLICY) {
764                 lock_sock(sk);
765                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
766                                 optlen);
767                 release_sock(sk);
768         }
769 #endif
770         return err;
771 }
772
773 EXPORT_SYMBOL(ipv6_setsockopt);
774
775 #ifdef CONFIG_COMPAT
776 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
777                            char __user *optval, int optlen)
778 {
779         int err;
780
781         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
782                 if (udp_prot.compat_setsockopt != NULL)
783                         return udp_prot.compat_setsockopt(sk, level, optname,
784                                                           optval, optlen);
785                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
786         }
787
788         if (level != SOL_IPV6)
789                 return -ENOPROTOOPT;
790
791         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
792                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
793                         ipv6_setsockopt);
794
795         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
796 #ifdef CONFIG_NETFILTER
797         /* we need to exclude all possible ENOPROTOOPTs except default case */
798         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
799             optname != IPV6_XFRM_POLICY) {
800                 lock_sock(sk);
801                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
802                                            optval, optlen);
803                 release_sock(sk);
804         }
805 #endif
806         return err;
807 }
808
809 EXPORT_SYMBOL(compat_ipv6_setsockopt);
810 #endif
811
812 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
813                                   int optname, char __user *optval, int len)
814 {
815         struct ipv6_opt_hdr *hdr;
816
817         if (!opt)
818                 return 0;
819
820         switch(optname) {
821         case IPV6_HOPOPTS:
822                 hdr = opt->hopopt;
823                 break;
824         case IPV6_RTHDRDSTOPTS:
825                 hdr = opt->dst0opt;
826                 break;
827         case IPV6_RTHDR:
828                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
829                 break;
830         case IPV6_DSTOPTS:
831                 hdr = opt->dst1opt;
832                 break;
833         default:
834                 return -EINVAL; /* should not happen */
835         }
836
837         if (!hdr)
838                 return 0;
839
840         len = min_t(unsigned int, len, ipv6_optlen(hdr));
841         if (copy_to_user(optval, hdr, len))
842                 return -EFAULT;
843         return len;
844 }
845
846 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
847                     char __user *optval, int __user *optlen)
848 {
849         struct ipv6_pinfo *np = inet6_sk(sk);
850         int len;
851         int val;
852
853         if (ip6_mroute_opt(optname))
854                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
855
856         if (get_user(len, optlen))
857                 return -EFAULT;
858         switch (optname) {
859         case IPV6_ADDRFORM:
860                 if (sk->sk_protocol != IPPROTO_UDP &&
861                     sk->sk_protocol != IPPROTO_UDPLITE &&
862                     sk->sk_protocol != IPPROTO_TCP)
863                         return -EINVAL;
864                 if (sk->sk_state != TCP_ESTABLISHED)
865                         return -ENOTCONN;
866                 val = sk->sk_family;
867                 break;
868         case MCAST_MSFILTER:
869         {
870                 struct group_filter gsf;
871                 int err;
872
873                 if (len < GROUP_FILTER_SIZE(0))
874                         return -EINVAL;
875                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
876                         return -EFAULT;
877                 if (gsf.gf_group.ss_family != AF_INET6)
878                         return -EADDRNOTAVAIL;
879                 lock_sock(sk);
880                 err = ip6_mc_msfget(sk, &gsf,
881                         (struct group_filter __user *)optval, optlen);
882                 release_sock(sk);
883                 return err;
884         }
885
886         case IPV6_2292PKTOPTIONS:
887         {
888                 struct msghdr msg;
889                 struct sk_buff *skb;
890
891                 if (sk->sk_type != SOCK_STREAM)
892                         return -ENOPROTOOPT;
893
894                 msg.msg_control = optval;
895                 msg.msg_controllen = len;
896                 msg.msg_flags = 0;
897
898                 lock_sock(sk);
899                 skb = np->pktoptions;
900                 if (skb)
901                         atomic_inc(&skb->users);
902                 release_sock(sk);
903
904                 if (skb) {
905                         int err = datagram_recv_ctl(sk, &msg, skb);
906                         kfree_skb(skb);
907                         if (err)
908                                 return err;
909                 } else {
910                         if (np->rxopt.bits.rxinfo) {
911                                 struct in6_pktinfo src_info;
912                                 src_info.ipi6_ifindex = np->mcast_oif;
913                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
914                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
915                         }
916                         if (np->rxopt.bits.rxhlim) {
917                                 int hlim = np->mcast_hops;
918                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
919                         }
920                         if (np->rxopt.bits.rxoinfo) {
921                                 struct in6_pktinfo src_info;
922                                 src_info.ipi6_ifindex = np->mcast_oif;
923                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
924                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
925                         }
926                         if (np->rxopt.bits.rxohlim) {
927                                 int hlim = np->mcast_hops;
928                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
929                         }
930                 }
931                 len -= msg.msg_controllen;
932                 return put_user(len, optlen);
933         }
934         case IPV6_MTU:
935         {
936                 struct dst_entry *dst;
937                 val = 0;
938                 lock_sock(sk);
939                 dst = sk_dst_get(sk);
940                 if (dst) {
941                         val = dst_mtu(dst);
942                         dst_release(dst);
943                 }
944                 release_sock(sk);
945                 if (!val)
946                         return -ENOTCONN;
947                 break;
948         }
949
950         case IPV6_V6ONLY:
951                 val = np->ipv6only;
952                 break;
953
954         case IPV6_RECVPKTINFO:
955                 val = np->rxopt.bits.rxinfo;
956                 break;
957
958         case IPV6_2292PKTINFO:
959                 val = np->rxopt.bits.rxoinfo;
960                 break;
961
962         case IPV6_RECVHOPLIMIT:
963                 val = np->rxopt.bits.rxhlim;
964                 break;
965
966         case IPV6_2292HOPLIMIT:
967                 val = np->rxopt.bits.rxohlim;
968                 break;
969
970         case IPV6_RECVRTHDR:
971                 val = np->rxopt.bits.srcrt;
972                 break;
973
974         case IPV6_2292RTHDR:
975                 val = np->rxopt.bits.osrcrt;
976                 break;
977
978         case IPV6_HOPOPTS:
979         case IPV6_RTHDRDSTOPTS:
980         case IPV6_RTHDR:
981         case IPV6_DSTOPTS:
982         {
983
984                 lock_sock(sk);
985                 len = ipv6_getsockopt_sticky(sk, np->opt,
986                                              optname, optval, len);
987                 release_sock(sk);
988                 /* check if ipv6_getsockopt_sticky() returns err code */
989                 if (len < 0)
990                         return len;
991                 return put_user(len, optlen);
992         }
993
994         case IPV6_RECVHOPOPTS:
995                 val = np->rxopt.bits.hopopts;
996                 break;
997
998         case IPV6_2292HOPOPTS:
999                 val = np->rxopt.bits.ohopopts;
1000                 break;
1001
1002         case IPV6_RECVDSTOPTS:
1003                 val = np->rxopt.bits.dstopts;
1004                 break;
1005
1006         case IPV6_2292DSTOPTS:
1007                 val = np->rxopt.bits.odstopts;
1008                 break;
1009
1010         case IPV6_TCLASS:
1011                 val = np->tclass;
1012                 if (val < 0)
1013                         val = 0;
1014                 break;
1015
1016         case IPV6_RECVTCLASS:
1017                 val = np->rxopt.bits.rxtclass;
1018                 break;
1019
1020         case IPV6_FLOWINFO:
1021                 val = np->rxopt.bits.rxflow;
1022                 break;
1023
1024         case IPV6_UNICAST_HOPS:
1025         case IPV6_MULTICAST_HOPS:
1026         {
1027                 struct dst_entry *dst;
1028
1029                 if (optname == IPV6_UNICAST_HOPS)
1030                         val = np->hop_limit;
1031                 else
1032                         val = np->mcast_hops;
1033
1034                 dst = sk_dst_get(sk);
1035                 if (dst) {
1036                         if (val < 0)
1037                                 val = ip6_dst_hoplimit(dst);
1038                         dst_release(dst);
1039                 }
1040                 if (val < 0)
1041                         val = ipv6_devconf.hop_limit;
1042                 break;
1043         }
1044
1045         case IPV6_MULTICAST_LOOP:
1046                 val = np->mc_loop;
1047                 break;
1048
1049         case IPV6_MULTICAST_IF:
1050                 val = np->mcast_oif;
1051                 break;
1052
1053         case IPV6_MTU_DISCOVER:
1054                 val = np->pmtudisc;
1055                 break;
1056
1057         case IPV6_RECVERR:
1058                 val = np->recverr;
1059                 break;
1060
1061         case IPV6_FLOWINFO_SEND:
1062                 val = np->sndflow;
1063                 break;
1064
1065         case IPV6_ADDR_PREFERENCES:
1066                 val = 0;
1067
1068                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1069                         val |= IPV6_PREFER_SRC_TMP;
1070                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1071                         val |= IPV6_PREFER_SRC_PUBLIC;
1072                 else {
1073                         /* XXX: should we return system default? */
1074                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1075                 }
1076
1077                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1078                         val |= IPV6_PREFER_SRC_COA;
1079                 else
1080                         val |= IPV6_PREFER_SRC_HOME;
1081                 break;
1082
1083         default:
1084                 return -ENOPROTOOPT;
1085         }
1086         len = min_t(unsigned int, sizeof(int), len);
1087         if(put_user(len, optlen))
1088                 return -EFAULT;
1089         if(copy_to_user(optval,&val,len))
1090                 return -EFAULT;
1091         return 0;
1092 }
1093
1094 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1095                     char __user *optval, int __user *optlen)
1096 {
1097         int err;
1098
1099         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1100                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1101
1102         if(level != SOL_IPV6)
1103                 return -ENOPROTOOPT;
1104
1105         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1106 #ifdef CONFIG_NETFILTER
1107         /* we need to exclude all possible ENOPROTOOPTs except default case */
1108         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1109                 int len;
1110
1111                 if (get_user(len, optlen))
1112                         return -EFAULT;
1113
1114                 lock_sock(sk);
1115                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1116                                 &len);
1117                 release_sock(sk);
1118                 if (err >= 0)
1119                         err = put_user(len, optlen);
1120         }
1121 #endif
1122         return err;
1123 }
1124
1125 EXPORT_SYMBOL(ipv6_getsockopt);
1126
1127 #ifdef CONFIG_COMPAT
1128 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1129                            char __user *optval, int __user *optlen)
1130 {
1131         int err;
1132
1133         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1134                 if (udp_prot.compat_getsockopt != NULL)
1135                         return udp_prot.compat_getsockopt(sk, level, optname,
1136                                                           optval, optlen);
1137                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1138         }
1139
1140         if (level != SOL_IPV6)
1141                 return -ENOPROTOOPT;
1142
1143         if (optname == MCAST_MSFILTER)
1144                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1145                         ipv6_getsockopt);
1146
1147         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1148 #ifdef CONFIG_NETFILTER
1149         /* we need to exclude all possible ENOPROTOOPTs except default case */
1150         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1151                 int len;
1152
1153                 if (get_user(len, optlen))
1154                         return -EFAULT;
1155
1156                 lock_sock(sk);
1157                 err = compat_nf_getsockopt(sk, PF_INET6,
1158                                            optname, optval, &len);
1159                 release_sock(sk);
1160                 if (err >= 0)
1161                         err = put_user(len, optlen);
1162         }
1163 #endif
1164         return err;
1165 }
1166
1167 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1168 #endif
1169