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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
[mirror_ubuntu-artful-kernel.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 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * FIXME: Make the setsockopt code POSIX compliant: That is
16 *
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
19 *
20 * Changes:
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
23 */
24
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/mroute6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
39
40 #include <net/sock.h>
41 #include <net/snmp.h>
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
49 #include <net/tcp.h>
50 #include <net/udp.h>
51 #include <net/udplite.h>
52 #include <net/xfrm.h>
53 #include <net/compat.h>
54
55 #include <asm/uaccess.h>
56
57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
58
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
61
62 int ip6_ra_control(struct sock *sk, int sel)
63 {
64 struct ip6_ra_chain *ra, *new_ra, **rap;
65
66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
68 return -ENOPROTOOPT;
69
70 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel>=0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (new_ra == NULL) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
102 static
103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
104 struct ipv6_txoptions *opt)
105 {
106 if (inet_sk(sk)->is_icsk) {
107 if (opt &&
108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
109 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
110 struct inet_connection_sock *icsk = inet_csk(sk);
111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
113 }
114 opt = xchg(&inet6_sk(sk)->opt, opt);
115 } else {
116 write_lock(&sk->sk_dst_lock);
117 opt = xchg(&inet6_sk(sk)->opt, opt);
118 write_unlock(&sk->sk_dst_lock);
119 }
120 sk_dst_reset(sk);
121
122 return opt;
123 }
124
125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
126 char __user *optval, int optlen)
127 {
128 struct ipv6_pinfo *np = inet6_sk(sk);
129 struct net *net = sock_net(sk);
130 int val, valbool;
131 int retv = -ENOPROTOOPT;
132
133 if (optval == NULL)
134 val=0;
135 else {
136 if (optlen >= sizeof(int)) {
137 if (get_user(val, (int __user *) optval))
138 return -EFAULT;
139 } else
140 val = 0;
141 }
142
143 valbool = (val!=0);
144
145 if (ip6_mroute_opt(optname))
146 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
147
148 lock_sock(sk);
149
150 switch (optname) {
151
152 case IPV6_ADDRFORM:
153 if (optlen < sizeof(int))
154 goto e_inval;
155 if (val == PF_INET) {
156 struct ipv6_txoptions *opt;
157 struct sk_buff *pktopt;
158
159 if (sk->sk_type == SOCK_RAW)
160 break;
161
162 if (sk->sk_protocol == IPPROTO_UDP ||
163 sk->sk_protocol == IPPROTO_UDPLITE) {
164 struct udp_sock *up = udp_sk(sk);
165 if (up->pending == AF_INET6) {
166 retv = -EBUSY;
167 break;
168 }
169 } else if (sk->sk_protocol != IPPROTO_TCP)
170 break;
171
172 if (sk->sk_state != TCP_ESTABLISHED) {
173 retv = -ENOTCONN;
174 break;
175 }
176
177 if (ipv6_only_sock(sk) ||
178 !ipv6_addr_v4mapped(&np->daddr)) {
179 retv = -EADDRNOTAVAIL;
180 break;
181 }
182
183 fl6_free_socklist(sk);
184 ipv6_sock_mc_close(sk);
185
186 /*
187 * Sock is moving from IPv6 to IPv4 (sk_prot), so
188 * remove it from the refcnt debug socks count in the
189 * original family...
190 */
191 sk_refcnt_debug_dec(sk);
192
193 if (sk->sk_protocol == IPPROTO_TCP) {
194 struct inet_connection_sock *icsk = inet_csk(sk);
195 local_bh_disable();
196 sock_prot_inuse_add(net, sk->sk_prot, -1);
197 sock_prot_inuse_add(net, &tcp_prot, 1);
198 local_bh_enable();
199 sk->sk_prot = &tcp_prot;
200 icsk->icsk_af_ops = &ipv4_specific;
201 sk->sk_socket->ops = &inet_stream_ops;
202 sk->sk_family = PF_INET;
203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
204 } else {
205 struct proto *prot = &udp_prot;
206
207 if (sk->sk_protocol == IPPROTO_UDPLITE)
208 prot = &udplite_prot;
209 local_bh_disable();
210 sock_prot_inuse_add(net, sk->sk_prot, -1);
211 sock_prot_inuse_add(net, prot, 1);
212 local_bh_enable();
213 sk->sk_prot = prot;
214 sk->sk_socket->ops = &inet_dgram_ops;
215 sk->sk_family = PF_INET;
216 }
217 opt = xchg(&np->opt, NULL);
218 if (opt)
219 sock_kfree_s(sk, opt, opt->tot_len);
220 pktopt = xchg(&np->pktoptions, NULL);
221 kfree_skb(pktopt);
222
223 sk->sk_destruct = inet_sock_destruct;
224 /*
225 * ... and add it to the refcnt debug socks count
226 * in the new family. -acme
227 */
228 sk_refcnt_debug_inc(sk);
229 module_put(THIS_MODULE);
230 retv = 0;
231 break;
232 }
233 goto e_inval;
234
235 case IPV6_V6ONLY:
236 if (optlen < sizeof(int) ||
237 inet_sk(sk)->num)
238 goto e_inval;
239 np->ipv6only = valbool;
240 retv = 0;
241 break;
242
243 case IPV6_RECVPKTINFO:
244 if (optlen < sizeof(int))
245 goto e_inval;
246 np->rxopt.bits.rxinfo = valbool;
247 retv = 0;
248 break;
249
250 case IPV6_2292PKTINFO:
251 if (optlen < sizeof(int))
252 goto e_inval;
253 np->rxopt.bits.rxoinfo = valbool;
254 retv = 0;
255 break;
256
257 case IPV6_RECVHOPLIMIT:
258 if (optlen < sizeof(int))
259 goto e_inval;
260 np->rxopt.bits.rxhlim = valbool;
261 retv = 0;
262 break;
263
264 case IPV6_2292HOPLIMIT:
265 if (optlen < sizeof(int))
266 goto e_inval;
267 np->rxopt.bits.rxohlim = valbool;
268 retv = 0;
269 break;
270
271 case IPV6_RECVRTHDR:
272 if (optlen < sizeof(int))
273 goto e_inval;
274 np->rxopt.bits.srcrt = valbool;
275 retv = 0;
276 break;
277
278 case IPV6_2292RTHDR:
279 if (optlen < sizeof(int))
280 goto e_inval;
281 np->rxopt.bits.osrcrt = valbool;
282 retv = 0;
283 break;
284
285 case IPV6_RECVHOPOPTS:
286 if (optlen < sizeof(int))
287 goto e_inval;
288 np->rxopt.bits.hopopts = valbool;
289 retv = 0;
290 break;
291
292 case IPV6_2292HOPOPTS:
293 if (optlen < sizeof(int))
294 goto e_inval;
295 np->rxopt.bits.ohopopts = valbool;
296 retv = 0;
297 break;
298
299 case IPV6_RECVDSTOPTS:
300 if (optlen < sizeof(int))
301 goto e_inval;
302 np->rxopt.bits.dstopts = valbool;
303 retv = 0;
304 break;
305
306 case IPV6_2292DSTOPTS:
307 if (optlen < sizeof(int))
308 goto e_inval;
309 np->rxopt.bits.odstopts = valbool;
310 retv = 0;
311 break;
312
313 case IPV6_TCLASS:
314 if (optlen < sizeof(int))
315 goto e_inval;
316 if (val < -1 || val > 0xff)
317 goto e_inval;
318 /* RFC 3542, 6.5: default traffic class of 0x0 */
319 if (val == -1)
320 val = 0;
321 np->tclass = val;
322 retv = 0;
323 break;
324
325 case IPV6_RECVTCLASS:
326 if (optlen < sizeof(int))
327 goto e_inval;
328 np->rxopt.bits.rxtclass = valbool;
329 retv = 0;
330 break;
331
332 case IPV6_FLOWINFO:
333 if (optlen < sizeof(int))
334 goto e_inval;
335 np->rxopt.bits.rxflow = valbool;
336 retv = 0;
337 break;
338
339 case IPV6_HOPOPTS:
340 case IPV6_RTHDRDSTOPTS:
341 case IPV6_RTHDR:
342 case IPV6_DSTOPTS:
343 {
344 struct ipv6_txoptions *opt;
345
346 /* remove any sticky options header with a zero option
347 * length, per RFC3542.
348 */
349 if (optlen == 0)
350 optval = NULL;
351 else if (optval == NULL)
352 goto e_inval;
353 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
354 optlen & 0x7 || optlen > 8 * 255)
355 goto e_inval;
356
357 /* hop-by-hop / destination options are privileged option */
358 retv = -EPERM;
359 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
360 break;
361
362 opt = ipv6_renew_options(sk, np->opt, optname,
363 (struct ipv6_opt_hdr __user *)optval,
364 optlen);
365 if (IS_ERR(opt)) {
366 retv = PTR_ERR(opt);
367 break;
368 }
369
370 /* routing header option needs extra check */
371 retv = -EINVAL;
372 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
373 struct ipv6_rt_hdr *rthdr = opt->srcrt;
374 switch (rthdr->type) {
375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
376 case IPV6_SRCRT_TYPE_2:
377 if (rthdr->hdrlen != 2 ||
378 rthdr->segments_left != 1)
379 goto sticky_done;
380
381 break;
382 #endif
383 default:
384 goto sticky_done;
385 }
386 }
387
388 retv = 0;
389 opt = ipv6_update_options(sk, opt);
390 sticky_done:
391 if (opt)
392 sock_kfree_s(sk, opt, opt->tot_len);
393 break;
394 }
395
396 case IPV6_PKTINFO:
397 {
398 struct in6_pktinfo pkt;
399
400 if (optlen == 0)
401 goto e_inval;
402 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
403 goto e_inval;
404
405 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
406 retv = -EFAULT;
407 break;
408 }
409 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
410 goto e_inval;
411
412 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
413 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
414 retv = 0;
415 break;
416 }
417
418 case IPV6_2292PKTOPTIONS:
419 {
420 struct ipv6_txoptions *opt = NULL;
421 struct msghdr msg;
422 struct flowi fl;
423 int junk;
424
425 fl.fl6_flowlabel = 0;
426 fl.oif = sk->sk_bound_dev_if;
427
428 if (optlen == 0)
429 goto update;
430
431 /* 1K is probably excessive
432 * 1K is surely not enough, 2K per standard header is 16K.
433 */
434 retv = -EINVAL;
435 if (optlen > 64*1024)
436 break;
437
438 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
439 retv = -ENOBUFS;
440 if (opt == NULL)
441 break;
442
443 memset(opt, 0, sizeof(*opt));
444 opt->tot_len = sizeof(*opt) + optlen;
445 retv = -EFAULT;
446 if (copy_from_user(opt+1, optval, optlen))
447 goto done;
448
449 msg.msg_controllen = optlen;
450 msg.msg_control = (void*)(opt+1);
451
452 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
453 if (retv)
454 goto done;
455 update:
456 retv = 0;
457 opt = ipv6_update_options(sk, opt);
458 done:
459 if (opt)
460 sock_kfree_s(sk, opt, opt->tot_len);
461 break;
462 }
463 case IPV6_UNICAST_HOPS:
464 if (optlen < sizeof(int))
465 goto e_inval;
466 if (val > 255 || val < -1)
467 goto e_inval;
468 np->hop_limit = val;
469 retv = 0;
470 break;
471
472 case IPV6_MULTICAST_HOPS:
473 if (sk->sk_type == SOCK_STREAM)
474 break;
475 if (optlen < sizeof(int))
476 goto e_inval;
477 if (val > 255 || val < -1)
478 goto e_inval;
479 np->mcast_hops = val;
480 retv = 0;
481 break;
482
483 case IPV6_MULTICAST_LOOP:
484 if (optlen < sizeof(int))
485 goto e_inval;
486 if (val != valbool)
487 goto e_inval;
488 np->mc_loop = valbool;
489 retv = 0;
490 break;
491
492 case IPV6_MULTICAST_IF:
493 if (sk->sk_type == SOCK_STREAM)
494 break;
495 if (optlen < sizeof(int))
496 goto e_inval;
497
498 if (val) {
499 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
500 goto e_inval;
501
502 if (__dev_get_by_index(net, val) == NULL) {
503 retv = -ENODEV;
504 break;
505 }
506 }
507 np->mcast_oif = val;
508 retv = 0;
509 break;
510 case IPV6_ADD_MEMBERSHIP:
511 case IPV6_DROP_MEMBERSHIP:
512 {
513 struct ipv6_mreq mreq;
514
515 if (optlen < sizeof(struct ipv6_mreq))
516 goto e_inval;
517
518 retv = -EPROTO;
519 if (inet_sk(sk)->is_icsk)
520 break;
521
522 retv = -EFAULT;
523 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
524 break;
525
526 if (optname == IPV6_ADD_MEMBERSHIP)
527 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
528 else
529 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
530 break;
531 }
532 case IPV6_JOIN_ANYCAST:
533 case IPV6_LEAVE_ANYCAST:
534 {
535 struct ipv6_mreq mreq;
536
537 if (optlen < sizeof(struct ipv6_mreq))
538 goto e_inval;
539
540 retv = -EFAULT;
541 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
542 break;
543
544 if (optname == IPV6_JOIN_ANYCAST)
545 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
546 else
547 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
548 break;
549 }
550 case MCAST_JOIN_GROUP:
551 case MCAST_LEAVE_GROUP:
552 {
553 struct group_req greq;
554 struct sockaddr_in6 *psin6;
555
556 if (optlen < sizeof(struct group_req))
557 goto e_inval;
558
559 retv = -EFAULT;
560 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
561 break;
562 if (greq.gr_group.ss_family != AF_INET6) {
563 retv = -EADDRNOTAVAIL;
564 break;
565 }
566 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
567 if (optname == MCAST_JOIN_GROUP)
568 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
569 &psin6->sin6_addr);
570 else
571 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
572 &psin6->sin6_addr);
573 break;
574 }
575 case MCAST_JOIN_SOURCE_GROUP:
576 case MCAST_LEAVE_SOURCE_GROUP:
577 case MCAST_BLOCK_SOURCE:
578 case MCAST_UNBLOCK_SOURCE:
579 {
580 struct group_source_req greqs;
581 int omode, add;
582
583 if (optlen < sizeof(struct group_source_req))
584 goto e_inval;
585 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
586 retv = -EFAULT;
587 break;
588 }
589 if (greqs.gsr_group.ss_family != AF_INET6 ||
590 greqs.gsr_source.ss_family != AF_INET6) {
591 retv = -EADDRNOTAVAIL;
592 break;
593 }
594 if (optname == MCAST_BLOCK_SOURCE) {
595 omode = MCAST_EXCLUDE;
596 add = 1;
597 } else if (optname == MCAST_UNBLOCK_SOURCE) {
598 omode = MCAST_EXCLUDE;
599 add = 0;
600 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
601 struct sockaddr_in6 *psin6;
602
603 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
604 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
605 &psin6->sin6_addr);
606 /* prior join w/ different source is ok */
607 if (retv && retv != -EADDRINUSE)
608 break;
609 omode = MCAST_INCLUDE;
610 add = 1;
611 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
612 omode = MCAST_INCLUDE;
613 add = 0;
614 }
615 retv = ip6_mc_source(add, omode, sk, &greqs);
616 break;
617 }
618 case MCAST_MSFILTER:
619 {
620 extern int sysctl_mld_max_msf;
621 struct group_filter *gsf;
622
623 if (optlen < GROUP_FILTER_SIZE(0))
624 goto e_inval;
625 if (optlen > sysctl_optmem_max) {
626 retv = -ENOBUFS;
627 break;
628 }
629 gsf = kmalloc(optlen,GFP_KERNEL);
630 if (!gsf) {
631 retv = -ENOBUFS;
632 break;
633 }
634 retv = -EFAULT;
635 if (copy_from_user(gsf, optval, optlen)) {
636 kfree(gsf);
637 break;
638 }
639 /* numsrc >= (4G-140)/128 overflow in 32 bits */
640 if (gsf->gf_numsrc >= 0x1ffffffU ||
641 gsf->gf_numsrc > sysctl_mld_max_msf) {
642 kfree(gsf);
643 retv = -ENOBUFS;
644 break;
645 }
646 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
647 kfree(gsf);
648 retv = -EINVAL;
649 break;
650 }
651 retv = ip6_mc_msfilter(sk, gsf);
652 kfree(gsf);
653
654 break;
655 }
656 case IPV6_ROUTER_ALERT:
657 if (optlen < sizeof(int))
658 goto e_inval;
659 retv = ip6_ra_control(sk, val);
660 break;
661 case IPV6_MTU_DISCOVER:
662 if (optlen < sizeof(int))
663 goto e_inval;
664 if (val<0 || val>3)
665 goto e_inval;
666 np->pmtudisc = val;
667 retv = 0;
668 break;
669 case IPV6_MTU:
670 if (optlen < sizeof(int))
671 goto e_inval;
672 if (val && val < IPV6_MIN_MTU)
673 goto e_inval;
674 np->frag_size = val;
675 retv = 0;
676 break;
677 case IPV6_RECVERR:
678 if (optlen < sizeof(int))
679 goto e_inval;
680 np->recverr = valbool;
681 if (!val)
682 skb_queue_purge(&sk->sk_error_queue);
683 retv = 0;
684 break;
685 case IPV6_FLOWINFO_SEND:
686 if (optlen < sizeof(int))
687 goto e_inval;
688 np->sndflow = valbool;
689 retv = 0;
690 break;
691 case IPV6_FLOWLABEL_MGR:
692 retv = ipv6_flowlabel_opt(sk, optval, optlen);
693 break;
694 case IPV6_IPSEC_POLICY:
695 case IPV6_XFRM_POLICY:
696 retv = -EPERM;
697 if (!capable(CAP_NET_ADMIN))
698 break;
699 retv = xfrm_user_policy(sk, optname, optval, optlen);
700 break;
701
702 case IPV6_ADDR_PREFERENCES:
703 {
704 unsigned int pref = 0;
705 unsigned int prefmask = ~0;
706
707 if (optlen < sizeof(int))
708 goto e_inval;
709
710 retv = -EINVAL;
711
712 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
713 switch (val & (IPV6_PREFER_SRC_PUBLIC|
714 IPV6_PREFER_SRC_TMP|
715 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
716 case IPV6_PREFER_SRC_PUBLIC:
717 pref |= IPV6_PREFER_SRC_PUBLIC;
718 break;
719 case IPV6_PREFER_SRC_TMP:
720 pref |= IPV6_PREFER_SRC_TMP;
721 break;
722 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
723 break;
724 case 0:
725 goto pref_skip_pubtmp;
726 default:
727 goto e_inval;
728 }
729
730 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
731 IPV6_PREFER_SRC_TMP);
732 pref_skip_pubtmp:
733
734 /* check HOME/COA conflicts */
735 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
736 case IPV6_PREFER_SRC_HOME:
737 break;
738 case IPV6_PREFER_SRC_COA:
739 pref |= IPV6_PREFER_SRC_COA;
740 case 0:
741 goto pref_skip_coa;
742 default:
743 goto e_inval;
744 }
745
746 prefmask &= ~IPV6_PREFER_SRC_COA;
747 pref_skip_coa:
748
749 /* check CGA/NONCGA conflicts */
750 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
751 case IPV6_PREFER_SRC_CGA:
752 case IPV6_PREFER_SRC_NONCGA:
753 case 0:
754 break;
755 default:
756 goto e_inval;
757 }
758
759 np->srcprefs = (np->srcprefs & prefmask) | pref;
760 retv = 0;
761
762 break;
763 }
764 }
765
766 release_sock(sk);
767
768 return retv;
769
770 e_inval:
771 release_sock(sk);
772 return -EINVAL;
773 }
774
775 int ipv6_setsockopt(struct sock *sk, int level, int optname,
776 char __user *optval, int optlen)
777 {
778 int err;
779
780 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
781 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
782
783 if (level != SOL_IPV6)
784 return -ENOPROTOOPT;
785
786 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
787 #ifdef CONFIG_NETFILTER
788 /* we need to exclude all possible ENOPROTOOPTs except default case */
789 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
790 optname != IPV6_XFRM_POLICY) {
791 lock_sock(sk);
792 err = nf_setsockopt(sk, PF_INET6, optname, optval,
793 optlen);
794 release_sock(sk);
795 }
796 #endif
797 return err;
798 }
799
800 EXPORT_SYMBOL(ipv6_setsockopt);
801
802 #ifdef CONFIG_COMPAT
803 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
804 char __user *optval, int optlen)
805 {
806 int err;
807
808 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
809 if (udp_prot.compat_setsockopt != NULL)
810 return udp_prot.compat_setsockopt(sk, level, optname,
811 optval, optlen);
812 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
813 }
814
815 if (level != SOL_IPV6)
816 return -ENOPROTOOPT;
817
818 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
819 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
820 ipv6_setsockopt);
821
822 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
823 #ifdef CONFIG_NETFILTER
824 /* we need to exclude all possible ENOPROTOOPTs except default case */
825 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
826 optname != IPV6_XFRM_POLICY) {
827 lock_sock(sk);
828 err = compat_nf_setsockopt(sk, PF_INET6, optname,
829 optval, optlen);
830 release_sock(sk);
831 }
832 #endif
833 return err;
834 }
835
836 EXPORT_SYMBOL(compat_ipv6_setsockopt);
837 #endif
838
839 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
840 int optname, char __user *optval, int len)
841 {
842 struct ipv6_opt_hdr *hdr;
843
844 if (!opt)
845 return 0;
846
847 switch(optname) {
848 case IPV6_HOPOPTS:
849 hdr = opt->hopopt;
850 break;
851 case IPV6_RTHDRDSTOPTS:
852 hdr = opt->dst0opt;
853 break;
854 case IPV6_RTHDR:
855 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
856 break;
857 case IPV6_DSTOPTS:
858 hdr = opt->dst1opt;
859 break;
860 default:
861 return -EINVAL; /* should not happen */
862 }
863
864 if (!hdr)
865 return 0;
866
867 len = min_t(unsigned int, len, ipv6_optlen(hdr));
868 if (copy_to_user(optval, hdr, len))
869 return -EFAULT;
870 return len;
871 }
872
873 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
874 char __user *optval, int __user *optlen)
875 {
876 struct ipv6_pinfo *np = inet6_sk(sk);
877 int len;
878 int val;
879
880 if (ip6_mroute_opt(optname))
881 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
882
883 if (get_user(len, optlen))
884 return -EFAULT;
885 switch (optname) {
886 case IPV6_ADDRFORM:
887 if (sk->sk_protocol != IPPROTO_UDP &&
888 sk->sk_protocol != IPPROTO_UDPLITE &&
889 sk->sk_protocol != IPPROTO_TCP)
890 return -ENOPROTOOPT;
891 if (sk->sk_state != TCP_ESTABLISHED)
892 return -ENOTCONN;
893 val = sk->sk_family;
894 break;
895 case MCAST_MSFILTER:
896 {
897 struct group_filter gsf;
898 int err;
899
900 if (len < GROUP_FILTER_SIZE(0))
901 return -EINVAL;
902 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
903 return -EFAULT;
904 if (gsf.gf_group.ss_family != AF_INET6)
905 return -EADDRNOTAVAIL;
906 lock_sock(sk);
907 err = ip6_mc_msfget(sk, &gsf,
908 (struct group_filter __user *)optval, optlen);
909 release_sock(sk);
910 return err;
911 }
912
913 case IPV6_2292PKTOPTIONS:
914 {
915 struct msghdr msg;
916 struct sk_buff *skb;
917
918 if (sk->sk_type != SOCK_STREAM)
919 return -ENOPROTOOPT;
920
921 msg.msg_control = optval;
922 msg.msg_controllen = len;
923 msg.msg_flags = 0;
924
925 lock_sock(sk);
926 skb = np->pktoptions;
927 if (skb)
928 atomic_inc(&skb->users);
929 release_sock(sk);
930
931 if (skb) {
932 int err = datagram_recv_ctl(sk, &msg, skb);
933 kfree_skb(skb);
934 if (err)
935 return err;
936 } else {
937 if (np->rxopt.bits.rxinfo) {
938 struct in6_pktinfo src_info;
939 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
940 np->sticky_pktinfo.ipi6_ifindex;
941 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
942 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
943 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
944 }
945 if (np->rxopt.bits.rxhlim) {
946 int hlim = np->mcast_hops;
947 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
948 }
949 if (np->rxopt.bits.rxoinfo) {
950 struct in6_pktinfo src_info;
951 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
952 np->sticky_pktinfo.ipi6_ifindex;
953 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
954 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
955 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
956 }
957 if (np->rxopt.bits.rxohlim) {
958 int hlim = np->mcast_hops;
959 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
960 }
961 }
962 len -= msg.msg_controllen;
963 return put_user(len, optlen);
964 }
965 case IPV6_MTU:
966 {
967 struct dst_entry *dst;
968 val = 0;
969 lock_sock(sk);
970 dst = sk_dst_get(sk);
971 if (dst) {
972 val = dst_mtu(dst);
973 dst_release(dst);
974 }
975 release_sock(sk);
976 if (!val)
977 return -ENOTCONN;
978 break;
979 }
980
981 case IPV6_V6ONLY:
982 val = np->ipv6only;
983 break;
984
985 case IPV6_RECVPKTINFO:
986 val = np->rxopt.bits.rxinfo;
987 break;
988
989 case IPV6_2292PKTINFO:
990 val = np->rxopt.bits.rxoinfo;
991 break;
992
993 case IPV6_RECVHOPLIMIT:
994 val = np->rxopt.bits.rxhlim;
995 break;
996
997 case IPV6_2292HOPLIMIT:
998 val = np->rxopt.bits.rxohlim;
999 break;
1000
1001 case IPV6_RECVRTHDR:
1002 val = np->rxopt.bits.srcrt;
1003 break;
1004
1005 case IPV6_2292RTHDR:
1006 val = np->rxopt.bits.osrcrt;
1007 break;
1008
1009 case IPV6_HOPOPTS:
1010 case IPV6_RTHDRDSTOPTS:
1011 case IPV6_RTHDR:
1012 case IPV6_DSTOPTS:
1013 {
1014
1015 lock_sock(sk);
1016 len = ipv6_getsockopt_sticky(sk, np->opt,
1017 optname, optval, len);
1018 release_sock(sk);
1019 /* check if ipv6_getsockopt_sticky() returns err code */
1020 if (len < 0)
1021 return len;
1022 return put_user(len, optlen);
1023 }
1024
1025 case IPV6_RECVHOPOPTS:
1026 val = np->rxopt.bits.hopopts;
1027 break;
1028
1029 case IPV6_2292HOPOPTS:
1030 val = np->rxopt.bits.ohopopts;
1031 break;
1032
1033 case IPV6_RECVDSTOPTS:
1034 val = np->rxopt.bits.dstopts;
1035 break;
1036
1037 case IPV6_2292DSTOPTS:
1038 val = np->rxopt.bits.odstopts;
1039 break;
1040
1041 case IPV6_TCLASS:
1042 val = np->tclass;
1043 break;
1044
1045 case IPV6_RECVTCLASS:
1046 val = np->rxopt.bits.rxtclass;
1047 break;
1048
1049 case IPV6_FLOWINFO:
1050 val = np->rxopt.bits.rxflow;
1051 break;
1052
1053 case IPV6_UNICAST_HOPS:
1054 case IPV6_MULTICAST_HOPS:
1055 {
1056 struct dst_entry *dst;
1057
1058 if (optname == IPV6_UNICAST_HOPS)
1059 val = np->hop_limit;
1060 else
1061 val = np->mcast_hops;
1062
1063 dst = sk_dst_get(sk);
1064 if (dst) {
1065 if (val < 0)
1066 val = ip6_dst_hoplimit(dst);
1067 dst_release(dst);
1068 }
1069 if (val < 0)
1070 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1071 break;
1072 }
1073
1074 case IPV6_MULTICAST_LOOP:
1075 val = np->mc_loop;
1076 break;
1077
1078 case IPV6_MULTICAST_IF:
1079 val = np->mcast_oif;
1080 break;
1081
1082 case IPV6_MTU_DISCOVER:
1083 val = np->pmtudisc;
1084 break;
1085
1086 case IPV6_RECVERR:
1087 val = np->recverr;
1088 break;
1089
1090 case IPV6_FLOWINFO_SEND:
1091 val = np->sndflow;
1092 break;
1093
1094 case IPV6_ADDR_PREFERENCES:
1095 val = 0;
1096
1097 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1098 val |= IPV6_PREFER_SRC_TMP;
1099 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1100 val |= IPV6_PREFER_SRC_PUBLIC;
1101 else {
1102 /* XXX: should we return system default? */
1103 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1104 }
1105
1106 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1107 val |= IPV6_PREFER_SRC_COA;
1108 else
1109 val |= IPV6_PREFER_SRC_HOME;
1110 break;
1111
1112 default:
1113 return -ENOPROTOOPT;
1114 }
1115 len = min_t(unsigned int, sizeof(int), len);
1116 if(put_user(len, optlen))
1117 return -EFAULT;
1118 if(copy_to_user(optval,&val,len))
1119 return -EFAULT;
1120 return 0;
1121 }
1122
1123 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1124 char __user *optval, int __user *optlen)
1125 {
1126 int err;
1127
1128 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1129 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1130
1131 if(level != SOL_IPV6)
1132 return -ENOPROTOOPT;
1133
1134 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1135 #ifdef CONFIG_NETFILTER
1136 /* we need to exclude all possible ENOPROTOOPTs except default case */
1137 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1138 int len;
1139
1140 if (get_user(len, optlen))
1141 return -EFAULT;
1142
1143 lock_sock(sk);
1144 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1145 &len);
1146 release_sock(sk);
1147 if (err >= 0)
1148 err = put_user(len, optlen);
1149 }
1150 #endif
1151 return err;
1152 }
1153
1154 EXPORT_SYMBOL(ipv6_getsockopt);
1155
1156 #ifdef CONFIG_COMPAT
1157 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1158 char __user *optval, int __user *optlen)
1159 {
1160 int err;
1161
1162 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1163 if (udp_prot.compat_getsockopt != NULL)
1164 return udp_prot.compat_getsockopt(sk, level, optname,
1165 optval, optlen);
1166 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1167 }
1168
1169 if (level != SOL_IPV6)
1170 return -ENOPROTOOPT;
1171
1172 if (optname == MCAST_MSFILTER)
1173 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1174 ipv6_getsockopt);
1175
1176 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1177 #ifdef CONFIG_NETFILTER
1178 /* we need to exclude all possible ENOPROTOOPTs except default case */
1179 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1180 int len;
1181
1182 if (get_user(len, optlen))
1183 return -EFAULT;
1184
1185 lock_sock(sk);
1186 err = compat_nf_getsockopt(sk, PF_INET6,
1187 optname, optval, &len);
1188 release_sock(sk);
1189 if (err >= 0)
1190 err = put_user(len, optlen);
1191 }
1192 #endif
1193 return err;
1194 }
1195
1196 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1197 #endif
1198
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