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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[deliverable/linux.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 #include <linux/slab.h>
40
41 #include <net/sock.h>
42 #include <net/snmp.h>
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/transp_v6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/inet_common.h>
50 #include <net/tcp.h>
51 #include <net/udp.h>
52 #include <net/udplite.h>
53 #include <net/xfrm.h>
54 #include <net/compat.h>
55
56 #include <asm/uaccess.h>
57
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
60
61 int ip6_ra_control(struct sock *sk, int sel)
62 {
63 struct ip6_ra_chain *ra, *new_ra, **rap;
64
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
67 return -ENOPROTOOPT;
68
69 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
70
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
73 if (ra->sk == sk) {
74 if (sel >= 0) {
75 write_unlock_bh(&ip6_ra_lock);
76 kfree(new_ra);
77 return -EADDRINUSE;
78 }
79
80 *rap = ra->next;
81 write_unlock_bh(&ip6_ra_lock);
82
83 sock_put(sk);
84 kfree(ra);
85 return 0;
86 }
87 }
88 if (!new_ra) {
89 write_unlock_bh(&ip6_ra_lock);
90 return -ENOBUFS;
91 }
92 new_ra->sk = sk;
93 new_ra->sel = sel;
94 new_ra->next = ra;
95 *rap = new_ra;
96 sock_hold(sk);
97 write_unlock_bh(&ip6_ra_lock);
98 return 0;
99 }
100
101 static
102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104 {
105 if (inet_sk(sk)->is_icsk) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 }
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119 }
120
121 static bool setsockopt_needs_rtnl(int optname)
122 {
123 switch (optname) {
124 case IPV6_ADD_MEMBERSHIP:
125 case IPV6_DROP_MEMBERSHIP:
126 case IPV6_JOIN_ANYCAST:
127 case IPV6_LEAVE_ANYCAST:
128 case MCAST_JOIN_GROUP:
129 case MCAST_LEAVE_GROUP:
130 case MCAST_JOIN_SOURCE_GROUP:
131 case MCAST_LEAVE_SOURCE_GROUP:
132 case MCAST_BLOCK_SOURCE:
133 case MCAST_UNBLOCK_SOURCE:
134 case MCAST_MSFILTER:
135 return true;
136 }
137 return false;
138 }
139
140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
141 char __user *optval, unsigned int optlen)
142 {
143 struct ipv6_pinfo *np = inet6_sk(sk);
144 struct net *net = sock_net(sk);
145 int val, valbool;
146 int retv = -ENOPROTOOPT;
147 bool needs_rtnl = setsockopt_needs_rtnl(optname);
148
149 if (!optval)
150 val = 0;
151 else {
152 if (optlen >= sizeof(int)) {
153 if (get_user(val, (int __user *) optval))
154 return -EFAULT;
155 } else
156 val = 0;
157 }
158
159 valbool = (val != 0);
160
161 if (ip6_mroute_opt(optname))
162 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
163
164 if (needs_rtnl)
165 rtnl_lock();
166 lock_sock(sk);
167
168 switch (optname) {
169
170 case IPV6_ADDRFORM:
171 if (optlen < sizeof(int))
172 goto e_inval;
173 if (val == PF_INET) {
174 struct ipv6_txoptions *opt;
175 struct sk_buff *pktopt;
176
177 if (sk->sk_type == SOCK_RAW)
178 break;
179
180 if (sk->sk_protocol == IPPROTO_UDP ||
181 sk->sk_protocol == IPPROTO_UDPLITE) {
182 struct udp_sock *up = udp_sk(sk);
183 if (up->pending == AF_INET6) {
184 retv = -EBUSY;
185 break;
186 }
187 } else if (sk->sk_protocol != IPPROTO_TCP)
188 break;
189
190 if (sk->sk_state != TCP_ESTABLISHED) {
191 retv = -ENOTCONN;
192 break;
193 }
194
195 if (ipv6_only_sock(sk) ||
196 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
197 retv = -EADDRNOTAVAIL;
198 break;
199 }
200
201 fl6_free_socklist(sk);
202 ipv6_sock_mc_close(sk);
203
204 /*
205 * Sock is moving from IPv6 to IPv4 (sk_prot), so
206 * remove it from the refcnt debug socks count in the
207 * original family...
208 */
209 sk_refcnt_debug_dec(sk);
210
211 if (sk->sk_protocol == IPPROTO_TCP) {
212 struct inet_connection_sock *icsk = inet_csk(sk);
213 local_bh_disable();
214 sock_prot_inuse_add(net, sk->sk_prot, -1);
215 sock_prot_inuse_add(net, &tcp_prot, 1);
216 local_bh_enable();
217 sk->sk_prot = &tcp_prot;
218 icsk->icsk_af_ops = &ipv4_specific;
219 sk->sk_socket->ops = &inet_stream_ops;
220 sk->sk_family = PF_INET;
221 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
222 } else {
223 struct proto *prot = &udp_prot;
224
225 if (sk->sk_protocol == IPPROTO_UDPLITE)
226 prot = &udplite_prot;
227 local_bh_disable();
228 sock_prot_inuse_add(net, sk->sk_prot, -1);
229 sock_prot_inuse_add(net, prot, 1);
230 local_bh_enable();
231 sk->sk_prot = prot;
232 sk->sk_socket->ops = &inet_dgram_ops;
233 sk->sk_family = PF_INET;
234 }
235 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
236 NULL);
237 if (opt) {
238 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
239 txopt_put(opt);
240 }
241 pktopt = xchg(&np->pktoptions, NULL);
242 kfree_skb(pktopt);
243
244 sk->sk_destruct = inet_sock_destruct;
245 /*
246 * ... and add it to the refcnt debug socks count
247 * in the new family. -acme
248 */
249 sk_refcnt_debug_inc(sk);
250 module_put(THIS_MODULE);
251 retv = 0;
252 break;
253 }
254 goto e_inval;
255
256 case IPV6_V6ONLY:
257 if (optlen < sizeof(int) ||
258 inet_sk(sk)->inet_num)
259 goto e_inval;
260 sk->sk_ipv6only = valbool;
261 retv = 0;
262 break;
263
264 case IPV6_RECVPKTINFO:
265 if (optlen < sizeof(int))
266 goto e_inval;
267 np->rxopt.bits.rxinfo = valbool;
268 retv = 0;
269 break;
270
271 case IPV6_2292PKTINFO:
272 if (optlen < sizeof(int))
273 goto e_inval;
274 np->rxopt.bits.rxoinfo = valbool;
275 retv = 0;
276 break;
277
278 case IPV6_RECVHOPLIMIT:
279 if (optlen < sizeof(int))
280 goto e_inval;
281 np->rxopt.bits.rxhlim = valbool;
282 retv = 0;
283 break;
284
285 case IPV6_2292HOPLIMIT:
286 if (optlen < sizeof(int))
287 goto e_inval;
288 np->rxopt.bits.rxohlim = valbool;
289 retv = 0;
290 break;
291
292 case IPV6_RECVRTHDR:
293 if (optlen < sizeof(int))
294 goto e_inval;
295 np->rxopt.bits.srcrt = valbool;
296 retv = 0;
297 break;
298
299 case IPV6_2292RTHDR:
300 if (optlen < sizeof(int))
301 goto e_inval;
302 np->rxopt.bits.osrcrt = valbool;
303 retv = 0;
304 break;
305
306 case IPV6_RECVHOPOPTS:
307 if (optlen < sizeof(int))
308 goto e_inval;
309 np->rxopt.bits.hopopts = valbool;
310 retv = 0;
311 break;
312
313 case IPV6_2292HOPOPTS:
314 if (optlen < sizeof(int))
315 goto e_inval;
316 np->rxopt.bits.ohopopts = valbool;
317 retv = 0;
318 break;
319
320 case IPV6_RECVDSTOPTS:
321 if (optlen < sizeof(int))
322 goto e_inval;
323 np->rxopt.bits.dstopts = valbool;
324 retv = 0;
325 break;
326
327 case IPV6_2292DSTOPTS:
328 if (optlen < sizeof(int))
329 goto e_inval;
330 np->rxopt.bits.odstopts = valbool;
331 retv = 0;
332 break;
333
334 case IPV6_TCLASS:
335 if (optlen < sizeof(int))
336 goto e_inval;
337 if (val < -1 || val > 0xff)
338 goto e_inval;
339 /* RFC 3542, 6.5: default traffic class of 0x0 */
340 if (val == -1)
341 val = 0;
342 np->tclass = val;
343 retv = 0;
344 break;
345
346 case IPV6_RECVTCLASS:
347 if (optlen < sizeof(int))
348 goto e_inval;
349 np->rxopt.bits.rxtclass = valbool;
350 retv = 0;
351 break;
352
353 case IPV6_FLOWINFO:
354 if (optlen < sizeof(int))
355 goto e_inval;
356 np->rxopt.bits.rxflow = valbool;
357 retv = 0;
358 break;
359
360 case IPV6_RECVPATHMTU:
361 if (optlen < sizeof(int))
362 goto e_inval;
363 np->rxopt.bits.rxpmtu = valbool;
364 retv = 0;
365 break;
366
367 case IPV6_TRANSPARENT:
368 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
369 !ns_capable(net->user_ns, CAP_NET_RAW)) {
370 retv = -EPERM;
371 break;
372 }
373 if (optlen < sizeof(int))
374 goto e_inval;
375 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
376 inet_sk(sk)->transparent = valbool;
377 retv = 0;
378 break;
379
380 case IPV6_RECVORIGDSTADDR:
381 if (optlen < sizeof(int))
382 goto e_inval;
383 np->rxopt.bits.rxorigdstaddr = valbool;
384 retv = 0;
385 break;
386
387 case IPV6_HOPOPTS:
388 case IPV6_RTHDRDSTOPTS:
389 case IPV6_RTHDR:
390 case IPV6_DSTOPTS:
391 {
392 struct ipv6_txoptions *opt;
393
394 /* remove any sticky options header with a zero option
395 * length, per RFC3542.
396 */
397 if (optlen == 0)
398 optval = NULL;
399 else if (!optval)
400 goto e_inval;
401 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
402 optlen & 0x7 || optlen > 8 * 255)
403 goto e_inval;
404
405 /* hop-by-hop / destination options are privileged option */
406 retv = -EPERM;
407 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
408 break;
409
410 opt = rcu_dereference_protected(np->opt,
411 lockdep_sock_is_held(sk));
412 opt = ipv6_renew_options(sk, opt, optname,
413 (struct ipv6_opt_hdr __user *)optval,
414 optlen);
415 if (IS_ERR(opt)) {
416 retv = PTR_ERR(opt);
417 break;
418 }
419
420 /* routing header option needs extra check */
421 retv = -EINVAL;
422 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
423 struct ipv6_rt_hdr *rthdr = opt->srcrt;
424 switch (rthdr->type) {
425 #if IS_ENABLED(CONFIG_IPV6_MIP6)
426 case IPV6_SRCRT_TYPE_2:
427 if (rthdr->hdrlen != 2 ||
428 rthdr->segments_left != 1)
429 goto sticky_done;
430
431 break;
432 #endif
433 default:
434 goto sticky_done;
435 }
436 }
437
438 retv = 0;
439 opt = ipv6_update_options(sk, opt);
440 sticky_done:
441 if (opt) {
442 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
443 txopt_put(opt);
444 }
445 break;
446 }
447
448 case IPV6_PKTINFO:
449 {
450 struct in6_pktinfo pkt;
451
452 if (optlen == 0)
453 goto e_inval;
454 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
455 goto e_inval;
456
457 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
458 retv = -EFAULT;
459 break;
460 }
461 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
462 goto e_inval;
463
464 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
465 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
466 retv = 0;
467 break;
468 }
469
470 case IPV6_2292PKTOPTIONS:
471 {
472 struct ipv6_txoptions *opt = NULL;
473 struct msghdr msg;
474 struct flowi6 fl6;
475 struct sockcm_cookie sockc_junk;
476 struct ipcm6_cookie ipc6;
477
478 memset(&fl6, 0, sizeof(fl6));
479 fl6.flowi6_oif = sk->sk_bound_dev_if;
480 fl6.flowi6_mark = sk->sk_mark;
481
482 if (optlen == 0)
483 goto update;
484
485 /* 1K is probably excessive
486 * 1K is surely not enough, 2K per standard header is 16K.
487 */
488 retv = -EINVAL;
489 if (optlen > 64*1024)
490 break;
491
492 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
493 retv = -ENOBUFS;
494 if (!opt)
495 break;
496
497 memset(opt, 0, sizeof(*opt));
498 atomic_set(&opt->refcnt, 1);
499 opt->tot_len = sizeof(*opt) + optlen;
500 retv = -EFAULT;
501 if (copy_from_user(opt+1, optval, optlen))
502 goto done;
503
504 msg.msg_controllen = optlen;
505 msg.msg_control = (void *)(opt+1);
506 ipc6.opt = opt;
507
508 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
509 if (retv)
510 goto done;
511 update:
512 retv = 0;
513 opt = ipv6_update_options(sk, opt);
514 done:
515 if (opt) {
516 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
517 txopt_put(opt);
518 }
519 break;
520 }
521 case IPV6_UNICAST_HOPS:
522 if (optlen < sizeof(int))
523 goto e_inval;
524 if (val > 255 || val < -1)
525 goto e_inval;
526 np->hop_limit = val;
527 retv = 0;
528 break;
529
530 case IPV6_MULTICAST_HOPS:
531 if (sk->sk_type == SOCK_STREAM)
532 break;
533 if (optlen < sizeof(int))
534 goto e_inval;
535 if (val > 255 || val < -1)
536 goto e_inval;
537 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
538 retv = 0;
539 break;
540
541 case IPV6_MULTICAST_LOOP:
542 if (optlen < sizeof(int))
543 goto e_inval;
544 if (val != valbool)
545 goto e_inval;
546 np->mc_loop = valbool;
547 retv = 0;
548 break;
549
550 case IPV6_UNICAST_IF:
551 {
552 struct net_device *dev = NULL;
553 int ifindex;
554
555 if (optlen != sizeof(int))
556 goto e_inval;
557
558 ifindex = (__force int)ntohl((__force __be32)val);
559 if (ifindex == 0) {
560 np->ucast_oif = 0;
561 retv = 0;
562 break;
563 }
564
565 dev = dev_get_by_index(net, ifindex);
566 retv = -EADDRNOTAVAIL;
567 if (!dev)
568 break;
569 dev_put(dev);
570
571 retv = -EINVAL;
572 if (sk->sk_bound_dev_if)
573 break;
574
575 np->ucast_oif = ifindex;
576 retv = 0;
577 break;
578 }
579
580 case IPV6_MULTICAST_IF:
581 if (sk->sk_type == SOCK_STREAM)
582 break;
583 if (optlen < sizeof(int))
584 goto e_inval;
585
586 if (val) {
587 struct net_device *dev;
588
589 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
590 goto e_inval;
591
592 dev = dev_get_by_index(net, val);
593 if (!dev) {
594 retv = -ENODEV;
595 break;
596 }
597 dev_put(dev);
598 }
599 np->mcast_oif = val;
600 retv = 0;
601 break;
602 case IPV6_ADD_MEMBERSHIP:
603 case IPV6_DROP_MEMBERSHIP:
604 {
605 struct ipv6_mreq mreq;
606
607 if (optlen < sizeof(struct ipv6_mreq))
608 goto e_inval;
609
610 retv = -EPROTO;
611 if (inet_sk(sk)->is_icsk)
612 break;
613
614 retv = -EFAULT;
615 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
616 break;
617
618 if (optname == IPV6_ADD_MEMBERSHIP)
619 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
620 else
621 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
622 break;
623 }
624 case IPV6_JOIN_ANYCAST:
625 case IPV6_LEAVE_ANYCAST:
626 {
627 struct ipv6_mreq mreq;
628
629 if (optlen < sizeof(struct ipv6_mreq))
630 goto e_inval;
631
632 retv = -EFAULT;
633 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
634 break;
635
636 if (optname == IPV6_JOIN_ANYCAST)
637 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
638 else
639 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
640 break;
641 }
642 case MCAST_JOIN_GROUP:
643 case MCAST_LEAVE_GROUP:
644 {
645 struct group_req greq;
646 struct sockaddr_in6 *psin6;
647
648 if (optlen < sizeof(struct group_req))
649 goto e_inval;
650
651 retv = -EFAULT;
652 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
653 break;
654 if (greq.gr_group.ss_family != AF_INET6) {
655 retv = -EADDRNOTAVAIL;
656 break;
657 }
658 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
659 if (optname == MCAST_JOIN_GROUP)
660 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
661 &psin6->sin6_addr);
662 else
663 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
664 &psin6->sin6_addr);
665 break;
666 }
667 case MCAST_JOIN_SOURCE_GROUP:
668 case MCAST_LEAVE_SOURCE_GROUP:
669 case MCAST_BLOCK_SOURCE:
670 case MCAST_UNBLOCK_SOURCE:
671 {
672 struct group_source_req greqs;
673 int omode, add;
674
675 if (optlen < sizeof(struct group_source_req))
676 goto e_inval;
677 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
678 retv = -EFAULT;
679 break;
680 }
681 if (greqs.gsr_group.ss_family != AF_INET6 ||
682 greqs.gsr_source.ss_family != AF_INET6) {
683 retv = -EADDRNOTAVAIL;
684 break;
685 }
686 if (optname == MCAST_BLOCK_SOURCE) {
687 omode = MCAST_EXCLUDE;
688 add = 1;
689 } else if (optname == MCAST_UNBLOCK_SOURCE) {
690 omode = MCAST_EXCLUDE;
691 add = 0;
692 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
693 struct sockaddr_in6 *psin6;
694
695 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
696 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
697 &psin6->sin6_addr);
698 /* prior join w/ different source is ok */
699 if (retv && retv != -EADDRINUSE)
700 break;
701 omode = MCAST_INCLUDE;
702 add = 1;
703 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
704 omode = MCAST_INCLUDE;
705 add = 0;
706 }
707 retv = ip6_mc_source(add, omode, sk, &greqs);
708 break;
709 }
710 case MCAST_MSFILTER:
711 {
712 struct group_filter *gsf;
713
714 if (optlen < GROUP_FILTER_SIZE(0))
715 goto e_inval;
716 if (optlen > sysctl_optmem_max) {
717 retv = -ENOBUFS;
718 break;
719 }
720 gsf = kmalloc(optlen, GFP_KERNEL);
721 if (!gsf) {
722 retv = -ENOBUFS;
723 break;
724 }
725 retv = -EFAULT;
726 if (copy_from_user(gsf, optval, optlen)) {
727 kfree(gsf);
728 break;
729 }
730 /* numsrc >= (4G-140)/128 overflow in 32 bits */
731 if (gsf->gf_numsrc >= 0x1ffffffU ||
732 gsf->gf_numsrc > sysctl_mld_max_msf) {
733 kfree(gsf);
734 retv = -ENOBUFS;
735 break;
736 }
737 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
738 kfree(gsf);
739 retv = -EINVAL;
740 break;
741 }
742 retv = ip6_mc_msfilter(sk, gsf);
743 kfree(gsf);
744
745 break;
746 }
747 case IPV6_ROUTER_ALERT:
748 if (optlen < sizeof(int))
749 goto e_inval;
750 retv = ip6_ra_control(sk, val);
751 break;
752 case IPV6_MTU_DISCOVER:
753 if (optlen < sizeof(int))
754 goto e_inval;
755 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
756 goto e_inval;
757 np->pmtudisc = val;
758 retv = 0;
759 break;
760 case IPV6_MTU:
761 if (optlen < sizeof(int))
762 goto e_inval;
763 if (val && val < IPV6_MIN_MTU)
764 goto e_inval;
765 np->frag_size = val;
766 retv = 0;
767 break;
768 case IPV6_RECVERR:
769 if (optlen < sizeof(int))
770 goto e_inval;
771 np->recverr = valbool;
772 if (!val)
773 skb_queue_purge(&sk->sk_error_queue);
774 retv = 0;
775 break;
776 case IPV6_FLOWINFO_SEND:
777 if (optlen < sizeof(int))
778 goto e_inval;
779 np->sndflow = valbool;
780 retv = 0;
781 break;
782 case IPV6_FLOWLABEL_MGR:
783 retv = ipv6_flowlabel_opt(sk, optval, optlen);
784 break;
785 case IPV6_IPSEC_POLICY:
786 case IPV6_XFRM_POLICY:
787 retv = -EPERM;
788 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
789 break;
790 retv = xfrm_user_policy(sk, optname, optval, optlen);
791 break;
792
793 case IPV6_ADDR_PREFERENCES:
794 {
795 unsigned int pref = 0;
796 unsigned int prefmask = ~0;
797
798 if (optlen < sizeof(int))
799 goto e_inval;
800
801 retv = -EINVAL;
802
803 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
804 switch (val & (IPV6_PREFER_SRC_PUBLIC|
805 IPV6_PREFER_SRC_TMP|
806 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
807 case IPV6_PREFER_SRC_PUBLIC:
808 pref |= IPV6_PREFER_SRC_PUBLIC;
809 break;
810 case IPV6_PREFER_SRC_TMP:
811 pref |= IPV6_PREFER_SRC_TMP;
812 break;
813 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
814 break;
815 case 0:
816 goto pref_skip_pubtmp;
817 default:
818 goto e_inval;
819 }
820
821 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
822 IPV6_PREFER_SRC_TMP);
823 pref_skip_pubtmp:
824
825 /* check HOME/COA conflicts */
826 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
827 case IPV6_PREFER_SRC_HOME:
828 break;
829 case IPV6_PREFER_SRC_COA:
830 pref |= IPV6_PREFER_SRC_COA;
831 case 0:
832 goto pref_skip_coa;
833 default:
834 goto e_inval;
835 }
836
837 prefmask &= ~IPV6_PREFER_SRC_COA;
838 pref_skip_coa:
839
840 /* check CGA/NONCGA conflicts */
841 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
842 case IPV6_PREFER_SRC_CGA:
843 case IPV6_PREFER_SRC_NONCGA:
844 case 0:
845 break;
846 default:
847 goto e_inval;
848 }
849
850 np->srcprefs = (np->srcprefs & prefmask) | pref;
851 retv = 0;
852
853 break;
854 }
855 case IPV6_MINHOPCOUNT:
856 if (optlen < sizeof(int))
857 goto e_inval;
858 if (val < 0 || val > 255)
859 goto e_inval;
860 np->min_hopcount = val;
861 retv = 0;
862 break;
863 case IPV6_DONTFRAG:
864 np->dontfrag = valbool;
865 retv = 0;
866 break;
867 case IPV6_AUTOFLOWLABEL:
868 np->autoflowlabel = valbool;
869 retv = 0;
870 break;
871 }
872
873 release_sock(sk);
874 if (needs_rtnl)
875 rtnl_unlock();
876
877 return retv;
878
879 e_inval:
880 release_sock(sk);
881 if (needs_rtnl)
882 rtnl_unlock();
883 return -EINVAL;
884 }
885
886 int ipv6_setsockopt(struct sock *sk, int level, int optname,
887 char __user *optval, unsigned int optlen)
888 {
889 int err;
890
891 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
892 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
893
894 if (level != SOL_IPV6)
895 return -ENOPROTOOPT;
896
897 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
898 #ifdef CONFIG_NETFILTER
899 /* we need to exclude all possible ENOPROTOOPTs except default case */
900 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
901 optname != IPV6_XFRM_POLICY) {
902 lock_sock(sk);
903 err = nf_setsockopt(sk, PF_INET6, optname, optval,
904 optlen);
905 release_sock(sk);
906 }
907 #endif
908 return err;
909 }
910 EXPORT_SYMBOL(ipv6_setsockopt);
911
912 #ifdef CONFIG_COMPAT
913 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
914 char __user *optval, unsigned int optlen)
915 {
916 int err;
917
918 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
919 if (udp_prot.compat_setsockopt != NULL)
920 return udp_prot.compat_setsockopt(sk, level, optname,
921 optval, optlen);
922 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
923 }
924
925 if (level != SOL_IPV6)
926 return -ENOPROTOOPT;
927
928 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
929 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
930 ipv6_setsockopt);
931
932 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
933 #ifdef CONFIG_NETFILTER
934 /* we need to exclude all possible ENOPROTOOPTs except default case */
935 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
936 optname != IPV6_XFRM_POLICY) {
937 lock_sock(sk);
938 err = compat_nf_setsockopt(sk, PF_INET6, optname,
939 optval, optlen);
940 release_sock(sk);
941 }
942 #endif
943 return err;
944 }
945 EXPORT_SYMBOL(compat_ipv6_setsockopt);
946 #endif
947
948 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
949 int optname, char __user *optval, int len)
950 {
951 struct ipv6_opt_hdr *hdr;
952
953 if (!opt)
954 return 0;
955
956 switch (optname) {
957 case IPV6_HOPOPTS:
958 hdr = opt->hopopt;
959 break;
960 case IPV6_RTHDRDSTOPTS:
961 hdr = opt->dst0opt;
962 break;
963 case IPV6_RTHDR:
964 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
965 break;
966 case IPV6_DSTOPTS:
967 hdr = opt->dst1opt;
968 break;
969 default:
970 return -EINVAL; /* should not happen */
971 }
972
973 if (!hdr)
974 return 0;
975
976 len = min_t(unsigned int, len, ipv6_optlen(hdr));
977 if (copy_to_user(optval, hdr, len))
978 return -EFAULT;
979 return len;
980 }
981
982 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
983 char __user *optval, int __user *optlen, unsigned int flags)
984 {
985 struct ipv6_pinfo *np = inet6_sk(sk);
986 int len;
987 int val;
988
989 if (ip6_mroute_opt(optname))
990 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
991
992 if (get_user(len, optlen))
993 return -EFAULT;
994 switch (optname) {
995 case IPV6_ADDRFORM:
996 if (sk->sk_protocol != IPPROTO_UDP &&
997 sk->sk_protocol != IPPROTO_UDPLITE &&
998 sk->sk_protocol != IPPROTO_TCP)
999 return -ENOPROTOOPT;
1000 if (sk->sk_state != TCP_ESTABLISHED)
1001 return -ENOTCONN;
1002 val = sk->sk_family;
1003 break;
1004 case MCAST_MSFILTER:
1005 {
1006 struct group_filter gsf;
1007 int err;
1008
1009 if (len < GROUP_FILTER_SIZE(0))
1010 return -EINVAL;
1011 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1012 return -EFAULT;
1013 if (gsf.gf_group.ss_family != AF_INET6)
1014 return -EADDRNOTAVAIL;
1015 lock_sock(sk);
1016 err = ip6_mc_msfget(sk, &gsf,
1017 (struct group_filter __user *)optval, optlen);
1018 release_sock(sk);
1019 return err;
1020 }
1021
1022 case IPV6_2292PKTOPTIONS:
1023 {
1024 struct msghdr msg;
1025 struct sk_buff *skb;
1026
1027 if (sk->sk_type != SOCK_STREAM)
1028 return -ENOPROTOOPT;
1029
1030 msg.msg_control = optval;
1031 msg.msg_controllen = len;
1032 msg.msg_flags = flags;
1033
1034 lock_sock(sk);
1035 skb = np->pktoptions;
1036 if (skb)
1037 ip6_datagram_recv_ctl(sk, &msg, skb);
1038 release_sock(sk);
1039 if (!skb) {
1040 if (np->rxopt.bits.rxinfo) {
1041 struct in6_pktinfo src_info;
1042 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1043 np->sticky_pktinfo.ipi6_ifindex;
1044 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1045 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1046 }
1047 if (np->rxopt.bits.rxhlim) {
1048 int hlim = np->mcast_hops;
1049 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1050 }
1051 if (np->rxopt.bits.rxtclass) {
1052 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1053
1054 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1055 }
1056 if (np->rxopt.bits.rxoinfo) {
1057 struct in6_pktinfo src_info;
1058 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1059 np->sticky_pktinfo.ipi6_ifindex;
1060 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1061 np->sticky_pktinfo.ipi6_addr;
1062 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1063 }
1064 if (np->rxopt.bits.rxohlim) {
1065 int hlim = np->mcast_hops;
1066 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1067 }
1068 if (np->rxopt.bits.rxflow) {
1069 __be32 flowinfo = np->rcv_flowinfo;
1070
1071 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1072 }
1073 }
1074 len -= msg.msg_controllen;
1075 return put_user(len, optlen);
1076 }
1077 case IPV6_MTU:
1078 {
1079 struct dst_entry *dst;
1080
1081 val = 0;
1082 rcu_read_lock();
1083 dst = __sk_dst_get(sk);
1084 if (dst)
1085 val = dst_mtu(dst);
1086 rcu_read_unlock();
1087 if (!val)
1088 return -ENOTCONN;
1089 break;
1090 }
1091
1092 case IPV6_V6ONLY:
1093 val = sk->sk_ipv6only;
1094 break;
1095
1096 case IPV6_RECVPKTINFO:
1097 val = np->rxopt.bits.rxinfo;
1098 break;
1099
1100 case IPV6_2292PKTINFO:
1101 val = np->rxopt.bits.rxoinfo;
1102 break;
1103
1104 case IPV6_RECVHOPLIMIT:
1105 val = np->rxopt.bits.rxhlim;
1106 break;
1107
1108 case IPV6_2292HOPLIMIT:
1109 val = np->rxopt.bits.rxohlim;
1110 break;
1111
1112 case IPV6_RECVRTHDR:
1113 val = np->rxopt.bits.srcrt;
1114 break;
1115
1116 case IPV6_2292RTHDR:
1117 val = np->rxopt.bits.osrcrt;
1118 break;
1119
1120 case IPV6_HOPOPTS:
1121 case IPV6_RTHDRDSTOPTS:
1122 case IPV6_RTHDR:
1123 case IPV6_DSTOPTS:
1124 {
1125 struct ipv6_txoptions *opt;
1126
1127 lock_sock(sk);
1128 opt = rcu_dereference_protected(np->opt,
1129 lockdep_sock_is_held(sk));
1130 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1131 release_sock(sk);
1132 /* check if ipv6_getsockopt_sticky() returns err code */
1133 if (len < 0)
1134 return len;
1135 return put_user(len, optlen);
1136 }
1137
1138 case IPV6_RECVHOPOPTS:
1139 val = np->rxopt.bits.hopopts;
1140 break;
1141
1142 case IPV6_2292HOPOPTS:
1143 val = np->rxopt.bits.ohopopts;
1144 break;
1145
1146 case IPV6_RECVDSTOPTS:
1147 val = np->rxopt.bits.dstopts;
1148 break;
1149
1150 case IPV6_2292DSTOPTS:
1151 val = np->rxopt.bits.odstopts;
1152 break;
1153
1154 case IPV6_TCLASS:
1155 val = np->tclass;
1156 break;
1157
1158 case IPV6_RECVTCLASS:
1159 val = np->rxopt.bits.rxtclass;
1160 break;
1161
1162 case IPV6_FLOWINFO:
1163 val = np->rxopt.bits.rxflow;
1164 break;
1165
1166 case IPV6_RECVPATHMTU:
1167 val = np->rxopt.bits.rxpmtu;
1168 break;
1169
1170 case IPV6_PATHMTU:
1171 {
1172 struct dst_entry *dst;
1173 struct ip6_mtuinfo mtuinfo;
1174
1175 if (len < sizeof(mtuinfo))
1176 return -EINVAL;
1177
1178 len = sizeof(mtuinfo);
1179 memset(&mtuinfo, 0, sizeof(mtuinfo));
1180
1181 rcu_read_lock();
1182 dst = __sk_dst_get(sk);
1183 if (dst)
1184 mtuinfo.ip6m_mtu = dst_mtu(dst);
1185 rcu_read_unlock();
1186 if (!mtuinfo.ip6m_mtu)
1187 return -ENOTCONN;
1188
1189 if (put_user(len, optlen))
1190 return -EFAULT;
1191 if (copy_to_user(optval, &mtuinfo, len))
1192 return -EFAULT;
1193
1194 return 0;
1195 }
1196
1197 case IPV6_TRANSPARENT:
1198 val = inet_sk(sk)->transparent;
1199 break;
1200
1201 case IPV6_RECVORIGDSTADDR:
1202 val = np->rxopt.bits.rxorigdstaddr;
1203 break;
1204
1205 case IPV6_UNICAST_HOPS:
1206 case IPV6_MULTICAST_HOPS:
1207 {
1208 struct dst_entry *dst;
1209
1210 if (optname == IPV6_UNICAST_HOPS)
1211 val = np->hop_limit;
1212 else
1213 val = np->mcast_hops;
1214
1215 if (val < 0) {
1216 rcu_read_lock();
1217 dst = __sk_dst_get(sk);
1218 if (dst)
1219 val = ip6_dst_hoplimit(dst);
1220 rcu_read_unlock();
1221 }
1222
1223 if (val < 0)
1224 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1225 break;
1226 }
1227
1228 case IPV6_MULTICAST_LOOP:
1229 val = np->mc_loop;
1230 break;
1231
1232 case IPV6_MULTICAST_IF:
1233 val = np->mcast_oif;
1234 break;
1235
1236 case IPV6_UNICAST_IF:
1237 val = (__force int)htonl((__u32) np->ucast_oif);
1238 break;
1239
1240 case IPV6_MTU_DISCOVER:
1241 val = np->pmtudisc;
1242 break;
1243
1244 case IPV6_RECVERR:
1245 val = np->recverr;
1246 break;
1247
1248 case IPV6_FLOWINFO_SEND:
1249 val = np->sndflow;
1250 break;
1251
1252 case IPV6_FLOWLABEL_MGR:
1253 {
1254 struct in6_flowlabel_req freq;
1255 int flags;
1256
1257 if (len < sizeof(freq))
1258 return -EINVAL;
1259
1260 if (copy_from_user(&freq, optval, sizeof(freq)))
1261 return -EFAULT;
1262
1263 if (freq.flr_action != IPV6_FL_A_GET)
1264 return -EINVAL;
1265
1266 len = sizeof(freq);
1267 flags = freq.flr_flags;
1268
1269 memset(&freq, 0, sizeof(freq));
1270
1271 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1272 if (val < 0)
1273 return val;
1274
1275 if (put_user(len, optlen))
1276 return -EFAULT;
1277 if (copy_to_user(optval, &freq, len))
1278 return -EFAULT;
1279
1280 return 0;
1281 }
1282
1283 case IPV6_ADDR_PREFERENCES:
1284 val = 0;
1285
1286 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1287 val |= IPV6_PREFER_SRC_TMP;
1288 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1289 val |= IPV6_PREFER_SRC_PUBLIC;
1290 else {
1291 /* XXX: should we return system default? */
1292 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1293 }
1294
1295 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1296 val |= IPV6_PREFER_SRC_COA;
1297 else
1298 val |= IPV6_PREFER_SRC_HOME;
1299 break;
1300
1301 case IPV6_MINHOPCOUNT:
1302 val = np->min_hopcount;
1303 break;
1304
1305 case IPV6_DONTFRAG:
1306 val = np->dontfrag;
1307 break;
1308
1309 case IPV6_AUTOFLOWLABEL:
1310 val = np->autoflowlabel;
1311 break;
1312
1313 default:
1314 return -ENOPROTOOPT;
1315 }
1316 len = min_t(unsigned int, sizeof(int), len);
1317 if (put_user(len, optlen))
1318 return -EFAULT;
1319 if (copy_to_user(optval, &val, len))
1320 return -EFAULT;
1321 return 0;
1322 }
1323
1324 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1325 char __user *optval, int __user *optlen)
1326 {
1327 int err;
1328
1329 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1330 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1331
1332 if (level != SOL_IPV6)
1333 return -ENOPROTOOPT;
1334
1335 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1336 #ifdef CONFIG_NETFILTER
1337 /* we need to exclude all possible ENOPROTOOPTs except default case */
1338 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1339 int len;
1340
1341 if (get_user(len, optlen))
1342 return -EFAULT;
1343
1344 lock_sock(sk);
1345 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1346 &len);
1347 release_sock(sk);
1348 if (err >= 0)
1349 err = put_user(len, optlen);
1350 }
1351 #endif
1352 return err;
1353 }
1354 EXPORT_SYMBOL(ipv6_getsockopt);
1355
1356 #ifdef CONFIG_COMPAT
1357 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1358 char __user *optval, int __user *optlen)
1359 {
1360 int err;
1361
1362 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1363 if (udp_prot.compat_getsockopt != NULL)
1364 return udp_prot.compat_getsockopt(sk, level, optname,
1365 optval, optlen);
1366 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1367 }
1368
1369 if (level != SOL_IPV6)
1370 return -ENOPROTOOPT;
1371
1372 if (optname == MCAST_MSFILTER)
1373 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1374 ipv6_getsockopt);
1375
1376 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1377 MSG_CMSG_COMPAT);
1378 #ifdef CONFIG_NETFILTER
1379 /* we need to exclude all possible ENOPROTOOPTs except default case */
1380 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1381 int len;
1382
1383 if (get_user(len, optlen))
1384 return -EFAULT;
1385
1386 lock_sock(sk);
1387 err = compat_nf_getsockopt(sk, PF_INET6,
1388 optname, optval, &len);
1389 release_sock(sk);
1390 if (err >= 0)
1391 err = put_user(len, optlen);
1392 }
1393 #endif
1394 return err;
1395 }
1396 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1397 #endif
1398
Linux kernel - Deliverables
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