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ipv6: do not set sk_destruct in IPV6_ADDRFORM sockopt
[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 #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 #include <net/seg6.h>
56
57 #include <linux/uaccess.h>
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)->inet_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) {
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 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_ADDRFORM:
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
135 case MCAST_MSFILTER:
136 return true;
137 }
138 return false;
139 }
140
141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
142 char __user *optval, unsigned int optlen)
143 {
144 struct ipv6_pinfo *np = inet6_sk(sk);
145 struct net *net = sock_net(sk);
146 int val, valbool;
147 int retv = -ENOPROTOOPT;
148 bool needs_rtnl = setsockopt_needs_rtnl(optname);
149
150 if (!optval)
151 val = 0;
152 else {
153 if (optlen >= sizeof(int)) {
154 if (get_user(val, (int __user *) optval))
155 return -EFAULT;
156 } else
157 val = 0;
158 }
159
160 valbool = (val != 0);
161
162 if (ip6_mroute_opt(optname))
163 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
164
165 if (needs_rtnl)
166 rtnl_lock();
167 lock_sock(sk);
168
169 switch (optname) {
170
171 case IPV6_ADDRFORM:
172 if (optlen < sizeof(int))
173 goto e_inval;
174 if (val == PF_INET) {
175 struct ipv6_txoptions *opt;
176 struct sk_buff *pktopt;
177
178 if (sk->sk_type == SOCK_RAW)
179 break;
180
181 if (sk->sk_protocol == IPPROTO_UDP ||
182 sk->sk_protocol == IPPROTO_UDPLITE) {
183 struct udp_sock *up = udp_sk(sk);
184 if (up->pending == AF_INET6) {
185 retv = -EBUSY;
186 break;
187 }
188 } else if (sk->sk_protocol != IPPROTO_TCP)
189 break;
190
191 if (sk->sk_state != TCP_ESTABLISHED) {
192 retv = -ENOTCONN;
193 break;
194 }
195
196 if (ipv6_only_sock(sk) ||
197 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
198 retv = -EADDRNOTAVAIL;
199 break;
200 }
201
202 fl6_free_socklist(sk);
203 __ipv6_sock_mc_close(sk);
204
205 /*
206 * Sock is moving from IPv6 to IPv4 (sk_prot), so
207 * remove it from the refcnt debug socks count in the
208 * original family...
209 */
210 sk_refcnt_debug_dec(sk);
211
212 if (sk->sk_protocol == IPPROTO_TCP) {
213 struct inet_connection_sock *icsk = inet_csk(sk);
214 local_bh_disable();
215 sock_prot_inuse_add(net, sk->sk_prot, -1);
216 sock_prot_inuse_add(net, &tcp_prot, 1);
217 local_bh_enable();
218 sk->sk_prot = &tcp_prot;
219 icsk->icsk_af_ops = &ipv4_specific;
220 sk->sk_socket->ops = &inet_stream_ops;
221 sk->sk_family = PF_INET;
222 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
223 } else {
224 struct proto *prot = &udp_prot;
225
226 if (sk->sk_protocol == IPPROTO_UDPLITE)
227 prot = &udplite_prot;
228 local_bh_disable();
229 sock_prot_inuse_add(net, sk->sk_prot, -1);
230 sock_prot_inuse_add(net, prot, 1);
231 local_bh_enable();
232 sk->sk_prot = prot;
233 sk->sk_socket->ops = &inet_dgram_ops;
234 sk->sk_family = PF_INET;
235 }
236 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
237 NULL);
238 if (opt) {
239 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
240 txopt_put(opt);
241 }
242 pktopt = xchg(&np->pktoptions, NULL);
243 kfree_skb(pktopt);
244
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 case IPV6_SRCRT_TYPE_4:
434 {
435 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
436 opt->srcrt;
437
438 if (!seg6_validate_srh(srh, optlen))
439 goto sticky_done;
440 break;
441 }
442 default:
443 goto sticky_done;
444 }
445 }
446
447 retv = 0;
448 opt = ipv6_update_options(sk, opt);
449 sticky_done:
450 if (opt) {
451 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
452 txopt_put(opt);
453 }
454 break;
455 }
456
457 case IPV6_PKTINFO:
458 {
459 struct in6_pktinfo pkt;
460
461 if (optlen == 0)
462 goto e_inval;
463 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
464 goto e_inval;
465
466 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
467 retv = -EFAULT;
468 break;
469 }
470 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
471 goto e_inval;
472
473 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
474 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
475 retv = 0;
476 break;
477 }
478
479 case IPV6_2292PKTOPTIONS:
480 {
481 struct ipv6_txoptions *opt = NULL;
482 struct msghdr msg;
483 struct flowi6 fl6;
484 struct sockcm_cookie sockc_junk;
485 struct ipcm6_cookie ipc6;
486
487 memset(&fl6, 0, sizeof(fl6));
488 fl6.flowi6_oif = sk->sk_bound_dev_if;
489 fl6.flowi6_mark = sk->sk_mark;
490
491 if (optlen == 0)
492 goto update;
493
494 /* 1K is probably excessive
495 * 1K is surely not enough, 2K per standard header is 16K.
496 */
497 retv = -EINVAL;
498 if (optlen > 64*1024)
499 break;
500
501 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
502 retv = -ENOBUFS;
503 if (!opt)
504 break;
505
506 memset(opt, 0, sizeof(*opt));
507 refcount_set(&opt->refcnt, 1);
508 opt->tot_len = sizeof(*opt) + optlen;
509 retv = -EFAULT;
510 if (copy_from_user(opt+1, optval, optlen))
511 goto done;
512
513 msg.msg_controllen = optlen;
514 msg.msg_control = (void *)(opt+1);
515 ipc6.opt = opt;
516
517 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
518 if (retv)
519 goto done;
520 update:
521 retv = 0;
522 opt = ipv6_update_options(sk, opt);
523 done:
524 if (opt) {
525 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
526 txopt_put(opt);
527 }
528 break;
529 }
530 case IPV6_UNICAST_HOPS:
531 if (optlen < sizeof(int))
532 goto e_inval;
533 if (val > 255 || val < -1)
534 goto e_inval;
535 np->hop_limit = val;
536 retv = 0;
537 break;
538
539 case IPV6_MULTICAST_HOPS:
540 if (sk->sk_type == SOCK_STREAM)
541 break;
542 if (optlen < sizeof(int))
543 goto e_inval;
544 if (val > 255 || val < -1)
545 goto e_inval;
546 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
547 retv = 0;
548 break;
549
550 case IPV6_MULTICAST_LOOP:
551 if (optlen < sizeof(int))
552 goto e_inval;
553 if (val != valbool)
554 goto e_inval;
555 np->mc_loop = valbool;
556 retv = 0;
557 break;
558
559 case IPV6_UNICAST_IF:
560 {
561 struct net_device *dev = NULL;
562 int ifindex;
563
564 if (optlen != sizeof(int))
565 goto e_inval;
566
567 ifindex = (__force int)ntohl((__force __be32)val);
568 if (ifindex == 0) {
569 np->ucast_oif = 0;
570 retv = 0;
571 break;
572 }
573
574 dev = dev_get_by_index(net, ifindex);
575 retv = -EADDRNOTAVAIL;
576 if (!dev)
577 break;
578 dev_put(dev);
579
580 retv = -EINVAL;
581 if (sk->sk_bound_dev_if)
582 break;
583
584 np->ucast_oif = ifindex;
585 retv = 0;
586 break;
587 }
588
589 case IPV6_MULTICAST_IF:
590 if (sk->sk_type == SOCK_STREAM)
591 break;
592 if (optlen < sizeof(int))
593 goto e_inval;
594
595 if (val) {
596 struct net_device *dev;
597 int midx;
598
599 rcu_read_lock();
600
601 dev = dev_get_by_index_rcu(net, val);
602 if (!dev) {
603 rcu_read_unlock();
604 retv = -ENODEV;
605 break;
606 }
607 midx = l3mdev_master_ifindex_rcu(dev);
608
609 rcu_read_unlock();
610
611 if (sk->sk_bound_dev_if &&
612 sk->sk_bound_dev_if != val &&
613 (!midx || midx != sk->sk_bound_dev_if))
614 goto e_inval;
615 }
616 np->mcast_oif = val;
617 retv = 0;
618 break;
619 case IPV6_ADD_MEMBERSHIP:
620 case IPV6_DROP_MEMBERSHIP:
621 {
622 struct ipv6_mreq mreq;
623
624 if (optlen < sizeof(struct ipv6_mreq))
625 goto e_inval;
626
627 retv = -EPROTO;
628 if (inet_sk(sk)->is_icsk)
629 break;
630
631 retv = -EFAULT;
632 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
633 break;
634
635 if (optname == IPV6_ADD_MEMBERSHIP)
636 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
637 else
638 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
639 break;
640 }
641 case IPV6_JOIN_ANYCAST:
642 case IPV6_LEAVE_ANYCAST:
643 {
644 struct ipv6_mreq mreq;
645
646 if (optlen < sizeof(struct ipv6_mreq))
647 goto e_inval;
648
649 retv = -EFAULT;
650 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
651 break;
652
653 if (optname == IPV6_JOIN_ANYCAST)
654 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
655 else
656 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
657 break;
658 }
659 case MCAST_JOIN_GROUP:
660 case MCAST_LEAVE_GROUP:
661 {
662 struct group_req greq;
663 struct sockaddr_in6 *psin6;
664
665 if (optlen < sizeof(struct group_req))
666 goto e_inval;
667
668 retv = -EFAULT;
669 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
670 break;
671 if (greq.gr_group.ss_family != AF_INET6) {
672 retv = -EADDRNOTAVAIL;
673 break;
674 }
675 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
676 if (optname == MCAST_JOIN_GROUP)
677 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
678 &psin6->sin6_addr);
679 else
680 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
681 &psin6->sin6_addr);
682 break;
683 }
684 case MCAST_JOIN_SOURCE_GROUP:
685 case MCAST_LEAVE_SOURCE_GROUP:
686 case MCAST_BLOCK_SOURCE:
687 case MCAST_UNBLOCK_SOURCE:
688 {
689 struct group_source_req greqs;
690 int omode, add;
691
692 if (optlen < sizeof(struct group_source_req))
693 goto e_inval;
694 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
695 retv = -EFAULT;
696 break;
697 }
698 if (greqs.gsr_group.ss_family != AF_INET6 ||
699 greqs.gsr_source.ss_family != AF_INET6) {
700 retv = -EADDRNOTAVAIL;
701 break;
702 }
703 if (optname == MCAST_BLOCK_SOURCE) {
704 omode = MCAST_EXCLUDE;
705 add = 1;
706 } else if (optname == MCAST_UNBLOCK_SOURCE) {
707 omode = MCAST_EXCLUDE;
708 add = 0;
709 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
710 struct sockaddr_in6 *psin6;
711
712 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
713 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
714 &psin6->sin6_addr);
715 /* prior join w/ different source is ok */
716 if (retv && retv != -EADDRINUSE)
717 break;
718 omode = MCAST_INCLUDE;
719 add = 1;
720 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
721 omode = MCAST_INCLUDE;
722 add = 0;
723 }
724 retv = ip6_mc_source(add, omode, sk, &greqs);
725 break;
726 }
727 case MCAST_MSFILTER:
728 {
729 struct group_filter *gsf;
730
731 if (optlen < GROUP_FILTER_SIZE(0))
732 goto e_inval;
733 if (optlen > sysctl_optmem_max) {
734 retv = -ENOBUFS;
735 break;
736 }
737 gsf = memdup_user(optval, optlen);
738 if (IS_ERR(gsf)) {
739 retv = PTR_ERR(gsf);
740 break;
741 }
742 /* numsrc >= (4G-140)/128 overflow in 32 bits */
743 if (gsf->gf_numsrc >= 0x1ffffffU ||
744 gsf->gf_numsrc > sysctl_mld_max_msf) {
745 kfree(gsf);
746 retv = -ENOBUFS;
747 break;
748 }
749 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
750 kfree(gsf);
751 retv = -EINVAL;
752 break;
753 }
754 retv = ip6_mc_msfilter(sk, gsf);
755 kfree(gsf);
756
757 break;
758 }
759 case IPV6_ROUTER_ALERT:
760 if (optlen < sizeof(int))
761 goto e_inval;
762 retv = ip6_ra_control(sk, val);
763 break;
764 case IPV6_MTU_DISCOVER:
765 if (optlen < sizeof(int))
766 goto e_inval;
767 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
768 goto e_inval;
769 np->pmtudisc = val;
770 retv = 0;
771 break;
772 case IPV6_MTU:
773 if (optlen < sizeof(int))
774 goto e_inval;
775 if (val && val < IPV6_MIN_MTU)
776 goto e_inval;
777 np->frag_size = val;
778 retv = 0;
779 break;
780 case IPV6_RECVERR:
781 if (optlen < sizeof(int))
782 goto e_inval;
783 np->recverr = valbool;
784 if (!val)
785 skb_queue_purge(&sk->sk_error_queue);
786 retv = 0;
787 break;
788 case IPV6_FLOWINFO_SEND:
789 if (optlen < sizeof(int))
790 goto e_inval;
791 np->sndflow = valbool;
792 retv = 0;
793 break;
794 case IPV6_FLOWLABEL_MGR:
795 retv = ipv6_flowlabel_opt(sk, optval, optlen);
796 break;
797 case IPV6_IPSEC_POLICY:
798 case IPV6_XFRM_POLICY:
799 retv = -EPERM;
800 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
801 break;
802 retv = xfrm_user_policy(sk, optname, optval, optlen);
803 break;
804
805 case IPV6_ADDR_PREFERENCES:
806 {
807 unsigned int pref = 0;
808 unsigned int prefmask = ~0;
809
810 if (optlen < sizeof(int))
811 goto e_inval;
812
813 retv = -EINVAL;
814
815 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
816 switch (val & (IPV6_PREFER_SRC_PUBLIC|
817 IPV6_PREFER_SRC_TMP|
818 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
819 case IPV6_PREFER_SRC_PUBLIC:
820 pref |= IPV6_PREFER_SRC_PUBLIC;
821 break;
822 case IPV6_PREFER_SRC_TMP:
823 pref |= IPV6_PREFER_SRC_TMP;
824 break;
825 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
826 break;
827 case 0:
828 goto pref_skip_pubtmp;
829 default:
830 goto e_inval;
831 }
832
833 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
834 IPV6_PREFER_SRC_TMP);
835 pref_skip_pubtmp:
836
837 /* check HOME/COA conflicts */
838 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
839 case IPV6_PREFER_SRC_HOME:
840 break;
841 case IPV6_PREFER_SRC_COA:
842 pref |= IPV6_PREFER_SRC_COA;
843 case 0:
844 goto pref_skip_coa;
845 default:
846 goto e_inval;
847 }
848
849 prefmask &= ~IPV6_PREFER_SRC_COA;
850 pref_skip_coa:
851
852 /* check CGA/NONCGA conflicts */
853 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
854 case IPV6_PREFER_SRC_CGA:
855 case IPV6_PREFER_SRC_NONCGA:
856 case 0:
857 break;
858 default:
859 goto e_inval;
860 }
861
862 np->srcprefs = (np->srcprefs & prefmask) | pref;
863 retv = 0;
864
865 break;
866 }
867 case IPV6_MINHOPCOUNT:
868 if (optlen < sizeof(int))
869 goto e_inval;
870 if (val < 0 || val > 255)
871 goto e_inval;
872 np->min_hopcount = val;
873 retv = 0;
874 break;
875 case IPV6_DONTFRAG:
876 np->dontfrag = valbool;
877 retv = 0;
878 break;
879 case IPV6_AUTOFLOWLABEL:
880 np->autoflowlabel = valbool;
881 retv = 0;
882 break;
883 case IPV6_RECVFRAGSIZE:
884 np->rxopt.bits.recvfragsize = valbool;
885 retv = 0;
886 break;
887 }
888
889 release_sock(sk);
890 if (needs_rtnl)
891 rtnl_unlock();
892
893 return retv;
894
895 e_inval:
896 release_sock(sk);
897 if (needs_rtnl)
898 rtnl_unlock();
899 return -EINVAL;
900 }
901
902 int ipv6_setsockopt(struct sock *sk, int level, int optname,
903 char __user *optval, unsigned int optlen)
904 {
905 int err;
906
907 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
908 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
909
910 if (level != SOL_IPV6)
911 return -ENOPROTOOPT;
912
913 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
914 #ifdef CONFIG_NETFILTER
915 /* we need to exclude all possible ENOPROTOOPTs except default case */
916 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
917 optname != IPV6_XFRM_POLICY) {
918 lock_sock(sk);
919 err = nf_setsockopt(sk, PF_INET6, optname, optval,
920 optlen);
921 release_sock(sk);
922 }
923 #endif
924 return err;
925 }
926 EXPORT_SYMBOL(ipv6_setsockopt);
927
928 #ifdef CONFIG_COMPAT
929 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
930 char __user *optval, unsigned int optlen)
931 {
932 int err;
933
934 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
935 if (udp_prot.compat_setsockopt != NULL)
936 return udp_prot.compat_setsockopt(sk, level, optname,
937 optval, optlen);
938 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
939 }
940
941 if (level != SOL_IPV6)
942 return -ENOPROTOOPT;
943
944 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
945 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
946 ipv6_setsockopt);
947
948 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
949 #ifdef CONFIG_NETFILTER
950 /* we need to exclude all possible ENOPROTOOPTs except default case */
951 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
952 optname != IPV6_XFRM_POLICY) {
953 lock_sock(sk);
954 err = compat_nf_setsockopt(sk, PF_INET6, optname,
955 optval, optlen);
956 release_sock(sk);
957 }
958 #endif
959 return err;
960 }
961 EXPORT_SYMBOL(compat_ipv6_setsockopt);
962 #endif
963
964 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
965 int optname, char __user *optval, int len)
966 {
967 struct ipv6_opt_hdr *hdr;
968
969 if (!opt)
970 return 0;
971
972 switch (optname) {
973 case IPV6_HOPOPTS:
974 hdr = opt->hopopt;
975 break;
976 case IPV6_RTHDRDSTOPTS:
977 hdr = opt->dst0opt;
978 break;
979 case IPV6_RTHDR:
980 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
981 break;
982 case IPV6_DSTOPTS:
983 hdr = opt->dst1opt;
984 break;
985 default:
986 return -EINVAL; /* should not happen */
987 }
988
989 if (!hdr)
990 return 0;
991
992 len = min_t(unsigned int, len, ipv6_optlen(hdr));
993 if (copy_to_user(optval, hdr, len))
994 return -EFAULT;
995 return len;
996 }
997
998 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
999 char __user *optval, int __user *optlen, unsigned int flags)
1000 {
1001 struct ipv6_pinfo *np = inet6_sk(sk);
1002 int len;
1003 int val;
1004
1005 if (ip6_mroute_opt(optname))
1006 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1007
1008 if (get_user(len, optlen))
1009 return -EFAULT;
1010 switch (optname) {
1011 case IPV6_ADDRFORM:
1012 if (sk->sk_protocol != IPPROTO_UDP &&
1013 sk->sk_protocol != IPPROTO_UDPLITE &&
1014 sk->sk_protocol != IPPROTO_TCP)
1015 return -ENOPROTOOPT;
1016 if (sk->sk_state != TCP_ESTABLISHED)
1017 return -ENOTCONN;
1018 val = sk->sk_family;
1019 break;
1020 case MCAST_MSFILTER:
1021 {
1022 struct group_filter gsf;
1023 int err;
1024
1025 if (len < GROUP_FILTER_SIZE(0))
1026 return -EINVAL;
1027 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1028 return -EFAULT;
1029 if (gsf.gf_group.ss_family != AF_INET6)
1030 return -EADDRNOTAVAIL;
1031 lock_sock(sk);
1032 err = ip6_mc_msfget(sk, &gsf,
1033 (struct group_filter __user *)optval, optlen);
1034 release_sock(sk);
1035 return err;
1036 }
1037
1038 case IPV6_2292PKTOPTIONS:
1039 {
1040 struct msghdr msg;
1041 struct sk_buff *skb;
1042
1043 if (sk->sk_type != SOCK_STREAM)
1044 return -ENOPROTOOPT;
1045
1046 msg.msg_control = optval;
1047 msg.msg_controllen = len;
1048 msg.msg_flags = flags;
1049
1050 lock_sock(sk);
1051 skb = np->pktoptions;
1052 if (skb)
1053 ip6_datagram_recv_ctl(sk, &msg, skb);
1054 release_sock(sk);
1055 if (!skb) {
1056 if (np->rxopt.bits.rxinfo) {
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 : np->sticky_pktinfo.ipi6_addr;
1061 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1062 }
1063 if (np->rxopt.bits.rxhlim) {
1064 int hlim = np->mcast_hops;
1065 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1066 }
1067 if (np->rxopt.bits.rxtclass) {
1068 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1069
1070 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1071 }
1072 if (np->rxopt.bits.rxoinfo) {
1073 struct in6_pktinfo src_info;
1074 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1075 np->sticky_pktinfo.ipi6_ifindex;
1076 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1077 np->sticky_pktinfo.ipi6_addr;
1078 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1079 }
1080 if (np->rxopt.bits.rxohlim) {
1081 int hlim = np->mcast_hops;
1082 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1083 }
1084 if (np->rxopt.bits.rxflow) {
1085 __be32 flowinfo = np->rcv_flowinfo;
1086
1087 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1088 }
1089 }
1090 len -= msg.msg_controllen;
1091 return put_user(len, optlen);
1092 }
1093 case IPV6_MTU:
1094 {
1095 struct dst_entry *dst;
1096
1097 val = 0;
1098 rcu_read_lock();
1099 dst = __sk_dst_get(sk);
1100 if (dst)
1101 val = dst_mtu(dst);
1102 rcu_read_unlock();
1103 if (!val)
1104 return -ENOTCONN;
1105 break;
1106 }
1107
1108 case IPV6_V6ONLY:
1109 val = sk->sk_ipv6only;
1110 break;
1111
1112 case IPV6_RECVPKTINFO:
1113 val = np->rxopt.bits.rxinfo;
1114 break;
1115
1116 case IPV6_2292PKTINFO:
1117 val = np->rxopt.bits.rxoinfo;
1118 break;
1119
1120 case IPV6_RECVHOPLIMIT:
1121 val = np->rxopt.bits.rxhlim;
1122 break;
1123
1124 case IPV6_2292HOPLIMIT:
1125 val = np->rxopt.bits.rxohlim;
1126 break;
1127
1128 case IPV6_RECVRTHDR:
1129 val = np->rxopt.bits.srcrt;
1130 break;
1131
1132 case IPV6_2292RTHDR:
1133 val = np->rxopt.bits.osrcrt;
1134 break;
1135
1136 case IPV6_HOPOPTS:
1137 case IPV6_RTHDRDSTOPTS:
1138 case IPV6_RTHDR:
1139 case IPV6_DSTOPTS:
1140 {
1141 struct ipv6_txoptions *opt;
1142
1143 lock_sock(sk);
1144 opt = rcu_dereference_protected(np->opt,
1145 lockdep_sock_is_held(sk));
1146 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1147 release_sock(sk);
1148 /* check if ipv6_getsockopt_sticky() returns err code */
1149 if (len < 0)
1150 return len;
1151 return put_user(len, optlen);
1152 }
1153
1154 case IPV6_RECVHOPOPTS:
1155 val = np->rxopt.bits.hopopts;
1156 break;
1157
1158 case IPV6_2292HOPOPTS:
1159 val = np->rxopt.bits.ohopopts;
1160 break;
1161
1162 case IPV6_RECVDSTOPTS:
1163 val = np->rxopt.bits.dstopts;
1164 break;
1165
1166 case IPV6_2292DSTOPTS:
1167 val = np->rxopt.bits.odstopts;
1168 break;
1169
1170 case IPV6_TCLASS:
1171 val = np->tclass;
1172 break;
1173
1174 case IPV6_RECVTCLASS:
1175 val = np->rxopt.bits.rxtclass;
1176 break;
1177
1178 case IPV6_FLOWINFO:
1179 val = np->rxopt.bits.rxflow;
1180 break;
1181
1182 case IPV6_RECVPATHMTU:
1183 val = np->rxopt.bits.rxpmtu;
1184 break;
1185
1186 case IPV6_PATHMTU:
1187 {
1188 struct dst_entry *dst;
1189 struct ip6_mtuinfo mtuinfo;
1190
1191 if (len < sizeof(mtuinfo))
1192 return -EINVAL;
1193
1194 len = sizeof(mtuinfo);
1195 memset(&mtuinfo, 0, sizeof(mtuinfo));
1196
1197 rcu_read_lock();
1198 dst = __sk_dst_get(sk);
1199 if (dst)
1200 mtuinfo.ip6m_mtu = dst_mtu(dst);
1201 rcu_read_unlock();
1202 if (!mtuinfo.ip6m_mtu)
1203 return -ENOTCONN;
1204
1205 if (put_user(len, optlen))
1206 return -EFAULT;
1207 if (copy_to_user(optval, &mtuinfo, len))
1208 return -EFAULT;
1209
1210 return 0;
1211 }
1212
1213 case IPV6_TRANSPARENT:
1214 val = inet_sk(sk)->transparent;
1215 break;
1216
1217 case IPV6_RECVORIGDSTADDR:
1218 val = np->rxopt.bits.rxorigdstaddr;
1219 break;
1220
1221 case IPV6_UNICAST_HOPS:
1222 case IPV6_MULTICAST_HOPS:
1223 {
1224 struct dst_entry *dst;
1225
1226 if (optname == IPV6_UNICAST_HOPS)
1227 val = np->hop_limit;
1228 else
1229 val = np->mcast_hops;
1230
1231 if (val < 0) {
1232 rcu_read_lock();
1233 dst = __sk_dst_get(sk);
1234 if (dst)
1235 val = ip6_dst_hoplimit(dst);
1236 rcu_read_unlock();
1237 }
1238
1239 if (val < 0)
1240 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1241 break;
1242 }
1243
1244 case IPV6_MULTICAST_LOOP:
1245 val = np->mc_loop;
1246 break;
1247
1248 case IPV6_MULTICAST_IF:
1249 val = np->mcast_oif;
1250 break;
1251
1252 case IPV6_UNICAST_IF:
1253 val = (__force int)htonl((__u32) np->ucast_oif);
1254 break;
1255
1256 case IPV6_MTU_DISCOVER:
1257 val = np->pmtudisc;
1258 break;
1259
1260 case IPV6_RECVERR:
1261 val = np->recverr;
1262 break;
1263
1264 case IPV6_FLOWINFO_SEND:
1265 val = np->sndflow;
1266 break;
1267
1268 case IPV6_FLOWLABEL_MGR:
1269 {
1270 struct in6_flowlabel_req freq;
1271 int flags;
1272
1273 if (len < sizeof(freq))
1274 return -EINVAL;
1275
1276 if (copy_from_user(&freq, optval, sizeof(freq)))
1277 return -EFAULT;
1278
1279 if (freq.flr_action != IPV6_FL_A_GET)
1280 return -EINVAL;
1281
1282 len = sizeof(freq);
1283 flags = freq.flr_flags;
1284
1285 memset(&freq, 0, sizeof(freq));
1286
1287 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1288 if (val < 0)
1289 return val;
1290
1291 if (put_user(len, optlen))
1292 return -EFAULT;
1293 if (copy_to_user(optval, &freq, len))
1294 return -EFAULT;
1295
1296 return 0;
1297 }
1298
1299 case IPV6_ADDR_PREFERENCES:
1300 val = 0;
1301
1302 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1303 val |= IPV6_PREFER_SRC_TMP;
1304 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1305 val |= IPV6_PREFER_SRC_PUBLIC;
1306 else {
1307 /* XXX: should we return system default? */
1308 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1309 }
1310
1311 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1312 val |= IPV6_PREFER_SRC_COA;
1313 else
1314 val |= IPV6_PREFER_SRC_HOME;
1315 break;
1316
1317 case IPV6_MINHOPCOUNT:
1318 val = np->min_hopcount;
1319 break;
1320
1321 case IPV6_DONTFRAG:
1322 val = np->dontfrag;
1323 break;
1324
1325 case IPV6_AUTOFLOWLABEL:
1326 val = np->autoflowlabel;
1327 break;
1328
1329 case IPV6_RECVFRAGSIZE:
1330 val = np->rxopt.bits.recvfragsize;
1331 break;
1332
1333 default:
1334 return -ENOPROTOOPT;
1335 }
1336 len = min_t(unsigned int, sizeof(int), len);
1337 if (put_user(len, optlen))
1338 return -EFAULT;
1339 if (copy_to_user(optval, &val, len))
1340 return -EFAULT;
1341 return 0;
1342 }
1343
1344 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1345 char __user *optval, int __user *optlen)
1346 {
1347 int err;
1348
1349 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1350 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1351
1352 if (level != SOL_IPV6)
1353 return -ENOPROTOOPT;
1354
1355 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1356 #ifdef CONFIG_NETFILTER
1357 /* we need to exclude all possible ENOPROTOOPTs except default case */
1358 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1359 int len;
1360
1361 if (get_user(len, optlen))
1362 return -EFAULT;
1363
1364 lock_sock(sk);
1365 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1366 &len);
1367 release_sock(sk);
1368 if (err >= 0)
1369 err = put_user(len, optlen);
1370 }
1371 #endif
1372 return err;
1373 }
1374 EXPORT_SYMBOL(ipv6_getsockopt);
1375
1376 #ifdef CONFIG_COMPAT
1377 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1378 char __user *optval, int __user *optlen)
1379 {
1380 int err;
1381
1382 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1383 if (udp_prot.compat_getsockopt != NULL)
1384 return udp_prot.compat_getsockopt(sk, level, optname,
1385 optval, optlen);
1386 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1387 }
1388
1389 if (level != SOL_IPV6)
1390 return -ENOPROTOOPT;
1391
1392 if (optname == MCAST_MSFILTER)
1393 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1394 ipv6_getsockopt);
1395
1396 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1397 MSG_CMSG_COMPAT);
1398 #ifdef CONFIG_NETFILTER
1399 /* we need to exclude all possible ENOPROTOOPTs except default case */
1400 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1401 int len;
1402
1403 if (get_user(len, optlen))
1404 return -EFAULT;
1405
1406 lock_sock(sk);
1407 err = compat_nf_getsockopt(sk, PF_INET6,
1408 optname, optval, &len);
1409 release_sock(sk);
1410 if (err >= 0)
1411 err = put_user(len, optlen);
1412 }
1413 #endif
1414 return err;
1415 }
1416 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1417 #endif
1418
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