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Linux 4.1.16
[linux/fpc-iii.git] / net / ipv6 / ipv6_sockglue.c
blob4449ad1f81147cab79c44209f3f2a73dc1f6a934
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, sock_owned_by_user(sk));
411 opt = ipv6_renew_options(sk, opt, optname,
412 (struct ipv6_opt_hdr __user *)optval,
413 optlen);
414 if (IS_ERR(opt)) {
415 retv = PTR_ERR(opt);
416 break;
417 }
418
419 /* routing header option needs extra check */
420 retv = -EINVAL;
421 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
422 struct ipv6_rt_hdr *rthdr = opt->srcrt;
423 switch (rthdr->type) {
424 #if IS_ENABLED(CONFIG_IPV6_MIP6)
425 case IPV6_SRCRT_TYPE_2:
426 if (rthdr->hdrlen != 2 ||
427 rthdr->segments_left != 1)
428 goto sticky_done;
429
430 break;
431 #endif
432 default:
433 goto sticky_done;
434 }
435 }
436
437 retv = 0;
438 opt = ipv6_update_options(sk, opt);
439 sticky_done:
440 if (opt) {
441 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
442 txopt_put(opt);
443 }
444 break;
445 }
446
447 case IPV6_PKTINFO:
448 {
449 struct in6_pktinfo pkt;
450
451 if (optlen == 0)
452 goto e_inval;
453 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
454 goto e_inval;
455
456 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
457 retv = -EFAULT;
458 break;
459 }
460 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
461 goto e_inval;
462
463 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
464 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
465 retv = 0;
466 break;
467 }
468
469 case IPV6_2292PKTOPTIONS:
470 {
471 struct ipv6_txoptions *opt = NULL;
472 struct msghdr msg;
473 struct flowi6 fl6;
474 int junk;
475
476 memset(&fl6, 0, sizeof(fl6));
477 fl6.flowi6_oif = sk->sk_bound_dev_if;
478 fl6.flowi6_mark = sk->sk_mark;
479
480 if (optlen == 0)
481 goto update;
482
483 /* 1K is probably excessive
484 * 1K is surely not enough, 2K per standard header is 16K.
485 */
486 retv = -EINVAL;
487 if (optlen > 64*1024)
488 break;
489
490 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
491 retv = -ENOBUFS;
492 if (!opt)
493 break;
494
495 memset(opt, 0, sizeof(*opt));
496 atomic_set(&opt->refcnt, 1);
497 opt->tot_len = sizeof(*opt) + optlen;
498 retv = -EFAULT;
499 if (copy_from_user(opt+1, optval, optlen))
500 goto done;
501
502 msg.msg_controllen = optlen;
503 msg.msg_control = (void *)(opt+1);
504
505 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
506 &junk, &junk);
507 if (retv)
508 goto done;
509 update:
510 retv = 0;
511 opt = ipv6_update_options(sk, opt);
512 done:
513 if (opt) {
514 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
515 txopt_put(opt);
516 }
517 break;
518 }
519 case IPV6_UNICAST_HOPS:
520 if (optlen < sizeof(int))
521 goto e_inval;
522 if (val > 255 || val < -1)
523 goto e_inval;
524 np->hop_limit = val;
525 retv = 0;
526 break;
527
528 case IPV6_MULTICAST_HOPS:
529 if (sk->sk_type == SOCK_STREAM)
530 break;
531 if (optlen < sizeof(int))
532 goto e_inval;
533 if (val > 255 || val < -1)
534 goto e_inval;
535 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
536 retv = 0;
537 break;
538
539 case IPV6_MULTICAST_LOOP:
540 if (optlen < sizeof(int))
541 goto e_inval;
542 if (val != valbool)
543 goto e_inval;
544 np->mc_loop = valbool;
545 retv = 0;
546 break;
547
548 case IPV6_UNICAST_IF:
549 {
550 struct net_device *dev = NULL;
551 int ifindex;
552
553 if (optlen != sizeof(int))
554 goto e_inval;
555
556 ifindex = (__force int)ntohl((__force __be32)val);
557 if (ifindex == 0) {
558 np->ucast_oif = 0;
559 retv = 0;
560 break;
561 }
562
563 dev = dev_get_by_index(net, ifindex);
564 retv = -EADDRNOTAVAIL;
565 if (!dev)
566 break;
567 dev_put(dev);
568
569 retv = -EINVAL;
570 if (sk->sk_bound_dev_if)
571 break;
572
573 np->ucast_oif = ifindex;
574 retv = 0;
575 break;
576 }
577
578 case IPV6_MULTICAST_IF:
579 if (sk->sk_type == SOCK_STREAM)
580 break;
581 if (optlen < sizeof(int))
582 goto e_inval;
583
584 if (val) {
585 struct net_device *dev;
586
587 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
588 goto e_inval;
589
590 dev = dev_get_by_index(net, val);
591 if (!dev) {
592 retv = -ENODEV;
593 break;
594 }
595 dev_put(dev);
596 }
597 np->mcast_oif = val;
598 retv = 0;
599 break;
600 case IPV6_ADD_MEMBERSHIP:
601 case IPV6_DROP_MEMBERSHIP:
602 {
603 struct ipv6_mreq mreq;
604
605 if (optlen < sizeof(struct ipv6_mreq))
606 goto e_inval;
607
608 retv = -EPROTO;
609 if (inet_sk(sk)->is_icsk)
610 break;
611
612 retv = -EFAULT;
613 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
614 break;
615
616 if (optname == IPV6_ADD_MEMBERSHIP)
617 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
618 else
619 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
620 break;
621 }
622 case IPV6_JOIN_ANYCAST:
623 case IPV6_LEAVE_ANYCAST:
624 {
625 struct ipv6_mreq mreq;
626
627 if (optlen < sizeof(struct ipv6_mreq))
628 goto e_inval;
629
630 retv = -EFAULT;
631 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
632 break;
633
634 if (optname == IPV6_JOIN_ANYCAST)
635 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
636 else
637 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
638 break;
639 }
640 case MCAST_JOIN_GROUP:
641 case MCAST_LEAVE_GROUP:
642 {
643 struct group_req greq;
644 struct sockaddr_in6 *psin6;
645
646 if (optlen < sizeof(struct group_req))
647 goto e_inval;
648
649 retv = -EFAULT;
650 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
651 break;
652 if (greq.gr_group.ss_family != AF_INET6) {
653 retv = -EADDRNOTAVAIL;
654 break;
655 }
656 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
657 if (optname == MCAST_JOIN_GROUP)
658 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
659 &psin6->sin6_addr);
660 else
661 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
662 &psin6->sin6_addr);
663 break;
664 }
665 case MCAST_JOIN_SOURCE_GROUP:
666 case MCAST_LEAVE_SOURCE_GROUP:
667 case MCAST_BLOCK_SOURCE:
668 case MCAST_UNBLOCK_SOURCE:
669 {
670 struct group_source_req greqs;
671 int omode, add;
672
673 if (optlen < sizeof(struct group_source_req))
674 goto e_inval;
675 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
676 retv = -EFAULT;
677 break;
678 }
679 if (greqs.gsr_group.ss_family != AF_INET6 ||
680 greqs.gsr_source.ss_family != AF_INET6) {
681 retv = -EADDRNOTAVAIL;
682 break;
683 }
684 if (optname == MCAST_BLOCK_SOURCE) {
685 omode = MCAST_EXCLUDE;
686 add = 1;
687 } else if (optname == MCAST_UNBLOCK_SOURCE) {
688 omode = MCAST_EXCLUDE;
689 add = 0;
690 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
691 struct sockaddr_in6 *psin6;
692
693 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
694 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
695 &psin6->sin6_addr);
696 /* prior join w/ different source is ok */
697 if (retv && retv != -EADDRINUSE)
698 break;
699 omode = MCAST_INCLUDE;
700 add = 1;
701 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
702 omode = MCAST_INCLUDE;
703 add = 0;
704 }
705 retv = ip6_mc_source(add, omode, sk, &greqs);
706 break;
707 }
708 case MCAST_MSFILTER:
709 {
710 struct group_filter *gsf;
711
712 if (optlen < GROUP_FILTER_SIZE(0))
713 goto e_inval;
714 if (optlen > sysctl_optmem_max) {
715 retv = -ENOBUFS;
716 break;
717 }
718 gsf = kmalloc(optlen, GFP_KERNEL);
719 if (!gsf) {
720 retv = -ENOBUFS;
721 break;
722 }
723 retv = -EFAULT;
724 if (copy_from_user(gsf, optval, optlen)) {
725 kfree(gsf);
726 break;
727 }
728 /* numsrc >= (4G-140)/128 overflow in 32 bits */
729 if (gsf->gf_numsrc >= 0x1ffffffU ||
730 gsf->gf_numsrc > sysctl_mld_max_msf) {
731 kfree(gsf);
732 retv = -ENOBUFS;
733 break;
734 }
735 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
736 kfree(gsf);
737 retv = -EINVAL;
738 break;
739 }
740 retv = ip6_mc_msfilter(sk, gsf);
741 kfree(gsf);
742
743 break;
744 }
745 case IPV6_ROUTER_ALERT:
746 if (optlen < sizeof(int))
747 goto e_inval;
748 retv = ip6_ra_control(sk, val);
749 break;
750 case IPV6_MTU_DISCOVER:
751 if (optlen < sizeof(int))
752 goto e_inval;
753 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
754 goto e_inval;
755 np->pmtudisc = val;
756 retv = 0;
757 break;
758 case IPV6_MTU:
759 if (optlen < sizeof(int))
760 goto e_inval;
761 if (val && val < IPV6_MIN_MTU)
762 goto e_inval;
763 np->frag_size = val;
764 retv = 0;
765 break;
766 case IPV6_RECVERR:
767 if (optlen < sizeof(int))
768 goto e_inval;
769 np->recverr = valbool;
770 if (!val)
771 skb_queue_purge(&sk->sk_error_queue);
772 retv = 0;
773 break;
774 case IPV6_FLOWINFO_SEND:
775 if (optlen < sizeof(int))
776 goto e_inval;
777 np->sndflow = valbool;
778 retv = 0;
779 break;
780 case IPV6_FLOWLABEL_MGR:
781 retv = ipv6_flowlabel_opt(sk, optval, optlen);
782 break;
783 case IPV6_IPSEC_POLICY:
784 case IPV6_XFRM_POLICY:
785 retv = -EPERM;
786 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
787 break;
788 retv = xfrm_user_policy(sk, optname, optval, optlen);
789 break;
790
791 case IPV6_ADDR_PREFERENCES:
792 {
793 unsigned int pref = 0;
794 unsigned int prefmask = ~0;
795
796 if (optlen < sizeof(int))
797 goto e_inval;
798
799 retv = -EINVAL;
800
801 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
802 switch (val & (IPV6_PREFER_SRC_PUBLIC|
803 IPV6_PREFER_SRC_TMP|
804 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
805 case IPV6_PREFER_SRC_PUBLIC:
806 pref |= IPV6_PREFER_SRC_PUBLIC;
807 break;
808 case IPV6_PREFER_SRC_TMP:
809 pref |= IPV6_PREFER_SRC_TMP;
810 break;
811 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
812 break;
813 case 0:
814 goto pref_skip_pubtmp;
815 default:
816 goto e_inval;
817 }
818
819 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
820 IPV6_PREFER_SRC_TMP);
821 pref_skip_pubtmp:
822
823 /* check HOME/COA conflicts */
824 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
825 case IPV6_PREFER_SRC_HOME:
826 break;
827 case IPV6_PREFER_SRC_COA:
828 pref |= IPV6_PREFER_SRC_COA;
829 case 0:
830 goto pref_skip_coa;
831 default:
832 goto e_inval;
833 }
834
835 prefmask &= ~IPV6_PREFER_SRC_COA;
836 pref_skip_coa:
837
838 /* check CGA/NONCGA conflicts */
839 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
840 case IPV6_PREFER_SRC_CGA:
841 case IPV6_PREFER_SRC_NONCGA:
842 case 0:
843 break;
844 default:
845 goto e_inval;
846 }
847
848 np->srcprefs = (np->srcprefs & prefmask) | pref;
849 retv = 0;
850
851 break;
852 }
853 case IPV6_MINHOPCOUNT:
854 if (optlen < sizeof(int))
855 goto e_inval;
856 if (val < 0 || val > 255)
857 goto e_inval;
858 np->min_hopcount = val;
859 retv = 0;
860 break;
861 case IPV6_DONTFRAG:
862 np->dontfrag = valbool;
863 retv = 0;
864 break;
865 case IPV6_AUTOFLOWLABEL:
866 np->autoflowlabel = valbool;
867 retv = 0;
868 break;
869 }
870
871 release_sock(sk);
872 if (needs_rtnl)
873 rtnl_unlock();
874
875 return retv;
876
877 e_inval:
878 release_sock(sk);
879 if (needs_rtnl)
880 rtnl_unlock();
881 return -EINVAL;
882 }
883
884 int ipv6_setsockopt(struct sock *sk, int level, int optname,
885 char __user *optval, unsigned int optlen)
886 {
887 int err;
888
889 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
890 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
891
892 if (level != SOL_IPV6)
893 return -ENOPROTOOPT;
894
895 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896 #ifdef CONFIG_NETFILTER
897 /* we need to exclude all possible ENOPROTOOPTs except default case */
898 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
899 optname != IPV6_XFRM_POLICY) {
900 lock_sock(sk);
901 err = nf_setsockopt(sk, PF_INET6, optname, optval,
902 optlen);
903 release_sock(sk);
904 }
905 #endif
906 return err;
907 }
908 EXPORT_SYMBOL(ipv6_setsockopt);
909
910 #ifdef CONFIG_COMPAT
911 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
912 char __user *optval, unsigned int optlen)
913 {
914 int err;
915
916 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
917 if (udp_prot.compat_setsockopt != NULL)
918 return udp_prot.compat_setsockopt(sk, level, optname,
919 optval, optlen);
920 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
921 }
922
923 if (level != SOL_IPV6)
924 return -ENOPROTOOPT;
925
926 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
927 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
928 ipv6_setsockopt);
929
930 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
931 #ifdef CONFIG_NETFILTER
932 /* we need to exclude all possible ENOPROTOOPTs except default case */
933 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
934 optname != IPV6_XFRM_POLICY) {
935 lock_sock(sk);
936 err = compat_nf_setsockopt(sk, PF_INET6, optname,
937 optval, optlen);
938 release_sock(sk);
939 }
940 #endif
941 return err;
942 }
943 EXPORT_SYMBOL(compat_ipv6_setsockopt);
944 #endif
945
946 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
947 int optname, char __user *optval, int len)
948 {
949 struct ipv6_opt_hdr *hdr;
950
951 if (!opt)
952 return 0;
953
954 switch (optname) {
955 case IPV6_HOPOPTS:
956 hdr = opt->hopopt;
957 break;
958 case IPV6_RTHDRDSTOPTS:
959 hdr = opt->dst0opt;
960 break;
961 case IPV6_RTHDR:
962 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
963 break;
964 case IPV6_DSTOPTS:
965 hdr = opt->dst1opt;
966 break;
967 default:
968 return -EINVAL; /* should not happen */
969 }
970
971 if (!hdr)
972 return 0;
973
974 len = min_t(unsigned int, len, ipv6_optlen(hdr));
975 if (copy_to_user(optval, hdr, len))
976 return -EFAULT;
977 return len;
978 }
979
980 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
981 char __user *optval, int __user *optlen, unsigned int flags)
982 {
983 struct ipv6_pinfo *np = inet6_sk(sk);
984 int len;
985 int val;
986
987 if (ip6_mroute_opt(optname))
988 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
989
990 if (get_user(len, optlen))
991 return -EFAULT;
992 switch (optname) {
993 case IPV6_ADDRFORM:
994 if (sk->sk_protocol != IPPROTO_UDP &&
995 sk->sk_protocol != IPPROTO_UDPLITE &&
996 sk->sk_protocol != IPPROTO_TCP)
997 return -ENOPROTOOPT;
998 if (sk->sk_state != TCP_ESTABLISHED)
999 return -ENOTCONN;
1000 val = sk->sk_family;
1001 break;
1002 case MCAST_MSFILTER:
1003 {
1004 struct group_filter gsf;
1005 int err;
1006
1007 if (len < GROUP_FILTER_SIZE(0))
1008 return -EINVAL;
1009 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1010 return -EFAULT;
1011 if (gsf.gf_group.ss_family != AF_INET6)
1012 return -EADDRNOTAVAIL;
1013 lock_sock(sk);
1014 err = ip6_mc_msfget(sk, &gsf,
1015 (struct group_filter __user *)optval, optlen);
1016 release_sock(sk);
1017 return err;
1018 }
1019
1020 case IPV6_2292PKTOPTIONS:
1021 {
1022 struct msghdr msg;
1023 struct sk_buff *skb;
1024
1025 if (sk->sk_type != SOCK_STREAM)
1026 return -ENOPROTOOPT;
1027
1028 msg.msg_control = optval;
1029 msg.msg_controllen = len;
1030 msg.msg_flags = flags;
1031
1032 lock_sock(sk);
1033 skb = np->pktoptions;
1034 if (skb)
1035 ip6_datagram_recv_ctl(sk, &msg, skb);
1036 release_sock(sk);
1037 if (!skb) {
1038 if (np->rxopt.bits.rxinfo) {
1039 struct in6_pktinfo src_info;
1040 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1041 np->sticky_pktinfo.ipi6_ifindex;
1042 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1043 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1044 }
1045 if (np->rxopt.bits.rxhlim) {
1046 int hlim = np->mcast_hops;
1047 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1048 }
1049 if (np->rxopt.bits.rxtclass) {
1050 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1051
1052 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1053 }
1054 if (np->rxopt.bits.rxoinfo) {
1055 struct in6_pktinfo src_info;
1056 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1057 np->sticky_pktinfo.ipi6_ifindex;
1058 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1059 np->sticky_pktinfo.ipi6_addr;
1060 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1061 }
1062 if (np->rxopt.bits.rxohlim) {
1063 int hlim = np->mcast_hops;
1064 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1065 }
1066 if (np->rxopt.bits.rxflow) {
1067 __be32 flowinfo = np->rcv_flowinfo;
1068
1069 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1070 }
1071 }
1072 len -= msg.msg_controllen;
1073 return put_user(len, optlen);
1074 }
1075 case IPV6_MTU:
1076 {
1077 struct dst_entry *dst;
1078
1079 val = 0;
1080 rcu_read_lock();
1081 dst = __sk_dst_get(sk);
1082 if (dst)
1083 val = dst_mtu(dst);
1084 rcu_read_unlock();
1085 if (!val)
1086 return -ENOTCONN;
1087 break;
1088 }
1089
1090 case IPV6_V6ONLY:
1091 val = sk->sk_ipv6only;
1092 break;
1093
1094 case IPV6_RECVPKTINFO:
1095 val = np->rxopt.bits.rxinfo;
1096 break;
1097
1098 case IPV6_2292PKTINFO:
1099 val = np->rxopt.bits.rxoinfo;
1100 break;
1101
1102 case IPV6_RECVHOPLIMIT:
1103 val = np->rxopt.bits.rxhlim;
1104 break;
1105
1106 case IPV6_2292HOPLIMIT:
1107 val = np->rxopt.bits.rxohlim;
1108 break;
1109
1110 case IPV6_RECVRTHDR:
1111 val = np->rxopt.bits.srcrt;
1112 break;
1113
1114 case IPV6_2292RTHDR:
1115 val = np->rxopt.bits.osrcrt;
1116 break;
1117
1118 case IPV6_HOPOPTS:
1119 case IPV6_RTHDRDSTOPTS:
1120 case IPV6_RTHDR:
1121 case IPV6_DSTOPTS:
1122 {
1123 struct ipv6_txoptions *opt;
1124
1125 lock_sock(sk);
1126 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1127 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1128 release_sock(sk);
1129 /* check if ipv6_getsockopt_sticky() returns err code */
1130 if (len < 0)
1131 return len;
1132 return put_user(len, optlen);
1133 }
1134
1135 case IPV6_RECVHOPOPTS:
1136 val = np->rxopt.bits.hopopts;
1137 break;
1138
1139 case IPV6_2292HOPOPTS:
1140 val = np->rxopt.bits.ohopopts;
1141 break;
1142
1143 case IPV6_RECVDSTOPTS:
1144 val = np->rxopt.bits.dstopts;
1145 break;
1146
1147 case IPV6_2292DSTOPTS:
1148 val = np->rxopt.bits.odstopts;
1149 break;
1150
1151 case IPV6_TCLASS:
1152 val = np->tclass;
1153 break;
1154
1155 case IPV6_RECVTCLASS:
1156 val = np->rxopt.bits.rxtclass;
1157 break;
1158
1159 case IPV6_FLOWINFO:
1160 val = np->rxopt.bits.rxflow;
1161 break;
1162
1163 case IPV6_RECVPATHMTU:
1164 val = np->rxopt.bits.rxpmtu;
1165 break;
1166
1167 case IPV6_PATHMTU:
1168 {
1169 struct dst_entry *dst;
1170 struct ip6_mtuinfo mtuinfo;
1171
1172 if (len < sizeof(mtuinfo))
1173 return -EINVAL;
1174
1175 len = sizeof(mtuinfo);
1176 memset(&mtuinfo, 0, sizeof(mtuinfo));
1177
1178 rcu_read_lock();
1179 dst = __sk_dst_get(sk);
1180 if (dst)
1181 mtuinfo.ip6m_mtu = dst_mtu(dst);
1182 rcu_read_unlock();
1183 if (!mtuinfo.ip6m_mtu)
1184 return -ENOTCONN;
1185
1186 if (put_user(len, optlen))
1187 return -EFAULT;
1188 if (copy_to_user(optval, &mtuinfo, len))
1189 return -EFAULT;
1190
1191 return 0;
1192 }
1193
1194 case IPV6_TRANSPARENT:
1195 val = inet_sk(sk)->transparent;
1196 break;
1197
1198 case IPV6_RECVORIGDSTADDR:
1199 val = np->rxopt.bits.rxorigdstaddr;
1200 break;
1201
1202 case IPV6_UNICAST_HOPS:
1203 case IPV6_MULTICAST_HOPS:
1204 {
1205 struct dst_entry *dst;
1206
1207 if (optname == IPV6_UNICAST_HOPS)
1208 val = np->hop_limit;
1209 else
1210 val = np->mcast_hops;
1211
1212 if (val < 0) {
1213 rcu_read_lock();
1214 dst = __sk_dst_get(sk);
1215 if (dst)
1216 val = ip6_dst_hoplimit(dst);
1217 rcu_read_unlock();
1218 }
1219
1220 if (val < 0)
1221 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1222 break;
1223 }
1224
1225 case IPV6_MULTICAST_LOOP:
1226 val = np->mc_loop;
1227 break;
1228
1229 case IPV6_MULTICAST_IF:
1230 val = np->mcast_oif;
1231 break;
1232
1233 case IPV6_UNICAST_IF:
1234 val = (__force int)htonl((__u32) np->ucast_oif);
1235 break;
1236
1237 case IPV6_MTU_DISCOVER:
1238 val = np->pmtudisc;
1239 break;
1240
1241 case IPV6_RECVERR:
1242 val = np->recverr;
1243 break;
1244
1245 case IPV6_FLOWINFO_SEND:
1246 val = np->sndflow;
1247 break;
1248
1249 case IPV6_FLOWLABEL_MGR:
1250 {
1251 struct in6_flowlabel_req freq;
1252 int flags;
1253
1254 if (len < sizeof(freq))
1255 return -EINVAL;
1256
1257 if (copy_from_user(&freq, optval, sizeof(freq)))
1258 return -EFAULT;
1259
1260 if (freq.flr_action != IPV6_FL_A_GET)
1261 return -EINVAL;
1262
1263 len = sizeof(freq);
1264 flags = freq.flr_flags;
1265
1266 memset(&freq, 0, sizeof(freq));
1267
1268 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1269 if (val < 0)
1270 return val;
1271
1272 if (put_user(len, optlen))
1273 return -EFAULT;
1274 if (copy_to_user(optval, &freq, len))
1275 return -EFAULT;
1276
1277 return 0;
1278 }
1279
1280 case IPV6_ADDR_PREFERENCES:
1281 val = 0;
1282
1283 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1284 val |= IPV6_PREFER_SRC_TMP;
1285 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1286 val |= IPV6_PREFER_SRC_PUBLIC;
1287 else {
1288 /* XXX: should we return system default? */
1289 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1290 }
1291
1292 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1293 val |= IPV6_PREFER_SRC_COA;
1294 else
1295 val |= IPV6_PREFER_SRC_HOME;
1296 break;
1297
1298 case IPV6_MINHOPCOUNT:
1299 val = np->min_hopcount;
1300 break;
1301
1302 case IPV6_DONTFRAG:
1303 val = np->dontfrag;
1304 break;
1305
1306 case IPV6_AUTOFLOWLABEL:
1307 val = np->autoflowlabel;
1308 break;
1309
1310 default:
1311 return -ENOPROTOOPT;
1312 }
1313 len = min_t(unsigned int, sizeof(int), len);
1314 if (put_user(len, optlen))
1315 return -EFAULT;
1316 if (copy_to_user(optval, &val, len))
1317 return -EFAULT;
1318 return 0;
1319 }
1320
1321 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1322 char __user *optval, int __user *optlen)
1323 {
1324 int err;
1325
1326 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1327 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1328
1329 if (level != SOL_IPV6)
1330 return -ENOPROTOOPT;
1331
1332 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1333 #ifdef CONFIG_NETFILTER
1334 /* we need to exclude all possible ENOPROTOOPTs except default case */
1335 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1336 int len;
1337
1338 if (get_user(len, optlen))
1339 return -EFAULT;
1340
1341 lock_sock(sk);
1342 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1343 &len);
1344 release_sock(sk);
1345 if (err >= 0)
1346 err = put_user(len, optlen);
1347 }
1348 #endif
1349 return err;
1350 }
1351 EXPORT_SYMBOL(ipv6_getsockopt);
1352
1353 #ifdef CONFIG_COMPAT
1354 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1355 char __user *optval, int __user *optlen)
1356 {
1357 int err;
1358
1359 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1360 if (udp_prot.compat_getsockopt != NULL)
1361 return udp_prot.compat_getsockopt(sk, level, optname,
1362 optval, optlen);
1363 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1364 }
1365
1366 if (level != SOL_IPV6)
1367 return -ENOPROTOOPT;
1368
1369 if (optname == MCAST_MSFILTER)
1370 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1371 ipv6_getsockopt);
1372
1373 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1374 MSG_CMSG_COMPAT);
1375 #ifdef CONFIG_NETFILTER
1376 /* we need to exclude all possible ENOPROTOOPTs except default case */
1377 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1378 int len;
1379
1380 if (get_user(len, optlen))
1381 return -EFAULT;
1382
1383 lock_sock(sk);
1384 err = compat_nf_getsockopt(sk, PF_INET6,
1385 optname, optval, &len);
1386 release_sock(sk);
1387 if (err >= 0)
1388 err = put_user(len, optlen);
1389 }
1390 #endif
1391 return err;
1392 }
1393 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1394 #endif
1395
Linux with added FPC-III support