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
ip6_ra_control(struct sock * sk,int sel)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
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)101 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
102 struct ipv6_txoptions *opt)
103 {
104 if (inet_sk(sk)->is_icsk) {
105 if (opt &&
106 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
107 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
108 struct inet_connection_sock *icsk = inet_csk(sk);
109 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
110 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
111 }
112 }
113 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
114 opt);
115 sk_dst_reset(sk);
116
117 return opt;
118 }
119
setsockopt_needs_rtnl(int optname)120 static bool setsockopt_needs_rtnl(int optname)
121 {
122 switch (optname) {
123 case IPV6_ADDRFORM:
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
do_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)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 int midx;
589
590 rcu_read_lock();
591
592 dev = dev_get_by_index_rcu(net, val);
593 if (!dev) {
594 rcu_read_unlock();
595 retv = -ENODEV;
596 break;
597 }
598 midx = l3mdev_master_ifindex_rcu(dev);
599
600 rcu_read_unlock();
601
602 if (sk->sk_bound_dev_if &&
603 sk->sk_bound_dev_if != val &&
604 (!midx || midx != sk->sk_bound_dev_if))
605 goto e_inval;
606 }
607 np->mcast_oif = val;
608 retv = 0;
609 break;
610 case IPV6_ADD_MEMBERSHIP:
611 case IPV6_DROP_MEMBERSHIP:
612 {
613 struct ipv6_mreq mreq;
614
615 if (optlen < sizeof(struct ipv6_mreq))
616 goto e_inval;
617
618 retv = -EPROTO;
619 if (inet_sk(sk)->is_icsk)
620 break;
621
622 retv = -EFAULT;
623 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
624 break;
625
626 if (optname == IPV6_ADD_MEMBERSHIP)
627 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
628 else
629 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
630 break;
631 }
632 case IPV6_JOIN_ANYCAST:
633 case IPV6_LEAVE_ANYCAST:
634 {
635 struct ipv6_mreq mreq;
636
637 if (optlen < sizeof(struct ipv6_mreq))
638 goto e_inval;
639
640 retv = -EFAULT;
641 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
642 break;
643
644 if (optname == IPV6_JOIN_ANYCAST)
645 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
646 else
647 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
648 break;
649 }
650 case MCAST_JOIN_GROUP:
651 case MCAST_LEAVE_GROUP:
652 {
653 struct group_req greq;
654 struct sockaddr_in6 *psin6;
655
656 if (optlen < sizeof(struct group_req))
657 goto e_inval;
658
659 retv = -EFAULT;
660 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
661 break;
662 if (greq.gr_group.ss_family != AF_INET6) {
663 retv = -EADDRNOTAVAIL;
664 break;
665 }
666 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
667 if (optname == MCAST_JOIN_GROUP)
668 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
669 &psin6->sin6_addr);
670 else
671 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
672 &psin6->sin6_addr);
673 break;
674 }
675 case MCAST_JOIN_SOURCE_GROUP:
676 case MCAST_LEAVE_SOURCE_GROUP:
677 case MCAST_BLOCK_SOURCE:
678 case MCAST_UNBLOCK_SOURCE:
679 {
680 struct group_source_req greqs;
681 int omode, add;
682
683 if (optlen < sizeof(struct group_source_req))
684 goto e_inval;
685 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
686 retv = -EFAULT;
687 break;
688 }
689 if (greqs.gsr_group.ss_family != AF_INET6 ||
690 greqs.gsr_source.ss_family != AF_INET6) {
691 retv = -EADDRNOTAVAIL;
692 break;
693 }
694 if (optname == MCAST_BLOCK_SOURCE) {
695 omode = MCAST_EXCLUDE;
696 add = 1;
697 } else if (optname == MCAST_UNBLOCK_SOURCE) {
698 omode = MCAST_EXCLUDE;
699 add = 0;
700 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
701 struct sockaddr_in6 *psin6;
702
703 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
704 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
705 &psin6->sin6_addr);
706 /* prior join w/ different source is ok */
707 if (retv && retv != -EADDRINUSE)
708 break;
709 omode = MCAST_INCLUDE;
710 add = 1;
711 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
712 omode = MCAST_INCLUDE;
713 add = 0;
714 }
715 retv = ip6_mc_source(add, omode, sk, &greqs);
716 break;
717 }
718 case MCAST_MSFILTER:
719 {
720 struct group_filter *gsf;
721
722 if (optlen < GROUP_FILTER_SIZE(0))
723 goto e_inval;
724 if (optlen > sysctl_optmem_max) {
725 retv = -ENOBUFS;
726 break;
727 }
728 gsf = kmalloc(optlen, GFP_KERNEL);
729 if (!gsf) {
730 retv = -ENOBUFS;
731 break;
732 }
733 retv = -EFAULT;
734 if (copy_from_user(gsf, optval, optlen)) {
735 kfree(gsf);
736 break;
737 }
738 /* numsrc >= (4G-140)/128 overflow in 32 bits */
739 if (gsf->gf_numsrc >= 0x1ffffffU ||
740 gsf->gf_numsrc > sysctl_mld_max_msf) {
741 kfree(gsf);
742 retv = -ENOBUFS;
743 break;
744 }
745 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
746 kfree(gsf);
747 retv = -EINVAL;
748 break;
749 }
750 retv = ip6_mc_msfilter(sk, gsf);
751 kfree(gsf);
752
753 break;
754 }
755 case IPV6_ROUTER_ALERT:
756 if (optlen < sizeof(int))
757 goto e_inval;
758 retv = ip6_ra_control(sk, val);
759 break;
760 case IPV6_MTU_DISCOVER:
761 if (optlen < sizeof(int))
762 goto e_inval;
763 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
764 goto e_inval;
765 np->pmtudisc = val;
766 retv = 0;
767 break;
768 case IPV6_MTU:
769 if (optlen < sizeof(int))
770 goto e_inval;
771 if (val && val < IPV6_MIN_MTU)
772 goto e_inval;
773 np->frag_size = val;
774 retv = 0;
775 break;
776 case IPV6_RECVERR:
777 if (optlen < sizeof(int))
778 goto e_inval;
779 np->recverr = valbool;
780 if (!val)
781 skb_queue_purge(&sk->sk_error_queue);
782 retv = 0;
783 break;
784 case IPV6_FLOWINFO_SEND:
785 if (optlen < sizeof(int))
786 goto e_inval;
787 np->sndflow = valbool;
788 retv = 0;
789 break;
790 case IPV6_FLOWLABEL_MGR:
791 retv = ipv6_flowlabel_opt(sk, optval, optlen);
792 break;
793 case IPV6_IPSEC_POLICY:
794 case IPV6_XFRM_POLICY:
795 retv = -EPERM;
796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
797 break;
798 retv = xfrm_user_policy(sk, optname, optval, optlen);
799 break;
800
801 case IPV6_ADDR_PREFERENCES:
802 {
803 unsigned int pref = 0;
804 unsigned int prefmask = ~0;
805
806 if (optlen < sizeof(int))
807 goto e_inval;
808
809 retv = -EINVAL;
810
811 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
812 switch (val & (IPV6_PREFER_SRC_PUBLIC|
813 IPV6_PREFER_SRC_TMP|
814 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
815 case IPV6_PREFER_SRC_PUBLIC:
816 pref |= IPV6_PREFER_SRC_PUBLIC;
817 break;
818 case IPV6_PREFER_SRC_TMP:
819 pref |= IPV6_PREFER_SRC_TMP;
820 break;
821 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
822 break;
823 case 0:
824 goto pref_skip_pubtmp;
825 default:
826 goto e_inval;
827 }
828
829 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
830 IPV6_PREFER_SRC_TMP);
831 pref_skip_pubtmp:
832
833 /* check HOME/COA conflicts */
834 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
835 case IPV6_PREFER_SRC_HOME:
836 break;
837 case IPV6_PREFER_SRC_COA:
838 pref |= IPV6_PREFER_SRC_COA;
839 case 0:
840 goto pref_skip_coa;
841 default:
842 goto e_inval;
843 }
844
845 prefmask &= ~IPV6_PREFER_SRC_COA;
846 pref_skip_coa:
847
848 /* check CGA/NONCGA conflicts */
849 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
850 case IPV6_PREFER_SRC_CGA:
851 case IPV6_PREFER_SRC_NONCGA:
852 case 0:
853 break;
854 default:
855 goto e_inval;
856 }
857
858 np->srcprefs = (np->srcprefs & prefmask) | pref;
859 retv = 0;
860
861 break;
862 }
863 case IPV6_MINHOPCOUNT:
864 if (optlen < sizeof(int))
865 goto e_inval;
866 if (val < 0 || val > 255)
867 goto e_inval;
868 np->min_hopcount = val;
869 retv = 0;
870 break;
871 case IPV6_DONTFRAG:
872 np->dontfrag = valbool;
873 retv = 0;
874 break;
875 case IPV6_AUTOFLOWLABEL:
876 np->autoflowlabel = valbool;
877 np->autoflowlabel_set = 1;
878 retv = 0;
879 break;
880 }
881
882 release_sock(sk);
883 if (needs_rtnl)
884 rtnl_unlock();
885
886 return retv;
887
888 e_inval:
889 release_sock(sk);
890 if (needs_rtnl)
891 rtnl_unlock();
892 return -EINVAL;
893 }
894
ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)895 int ipv6_setsockopt(struct sock *sk, int level, int optname,
896 char __user *optval, unsigned int optlen)
897 {
898 int err;
899
900 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
901 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
902
903 if (level != SOL_IPV6)
904 return -ENOPROTOOPT;
905
906 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
907 #ifdef CONFIG_NETFILTER
908 /* we need to exclude all possible ENOPROTOOPTs except default case */
909 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
910 optname != IPV6_XFRM_POLICY)
911 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
912 #endif
913 return err;
914 }
915 EXPORT_SYMBOL(ipv6_setsockopt);
916
917 #ifdef CONFIG_COMPAT
compat_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)918 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
919 char __user *optval, unsigned int optlen)
920 {
921 int err;
922
923 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
924 if (udp_prot.compat_setsockopt != NULL)
925 return udp_prot.compat_setsockopt(sk, level, optname,
926 optval, optlen);
927 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
928 }
929
930 if (level != SOL_IPV6)
931 return -ENOPROTOOPT;
932
933 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
934 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
935 ipv6_setsockopt);
936
937 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
938 #ifdef CONFIG_NETFILTER
939 /* we need to exclude all possible ENOPROTOOPTs except default case */
940 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
941 optname != IPV6_XFRM_POLICY)
942 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
943 optlen);
944 #endif
945 return err;
946 }
947 EXPORT_SYMBOL(compat_ipv6_setsockopt);
948 #endif
949
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,char __user * optval,int len)950 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
951 int optname, char __user *optval, int len)
952 {
953 struct ipv6_opt_hdr *hdr;
954
955 if (!opt)
956 return 0;
957
958 switch (optname) {
959 case IPV6_HOPOPTS:
960 hdr = opt->hopopt;
961 break;
962 case IPV6_RTHDRDSTOPTS:
963 hdr = opt->dst0opt;
964 break;
965 case IPV6_RTHDR:
966 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
967 break;
968 case IPV6_DSTOPTS:
969 hdr = opt->dst1opt;
970 break;
971 default:
972 return -EINVAL; /* should not happen */
973 }
974
975 if (!hdr)
976 return 0;
977
978 len = min_t(unsigned int, len, ipv6_optlen(hdr));
979 if (copy_to_user(optval, hdr, len))
980 return -EFAULT;
981 return len;
982 }
983
do_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen,unsigned int flags)984 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
985 char __user *optval, int __user *optlen, unsigned int flags)
986 {
987 struct ipv6_pinfo *np = inet6_sk(sk);
988 int len;
989 int val;
990
991 if (ip6_mroute_opt(optname))
992 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
993
994 if (get_user(len, optlen))
995 return -EFAULT;
996 switch (optname) {
997 case IPV6_ADDRFORM:
998 if (sk->sk_protocol != IPPROTO_UDP &&
999 sk->sk_protocol != IPPROTO_UDPLITE &&
1000 sk->sk_protocol != IPPROTO_TCP)
1001 return -ENOPROTOOPT;
1002 if (sk->sk_state != TCP_ESTABLISHED)
1003 return -ENOTCONN;
1004 val = sk->sk_family;
1005 break;
1006 case MCAST_MSFILTER:
1007 {
1008 struct group_filter gsf;
1009 int err;
1010
1011 if (len < GROUP_FILTER_SIZE(0))
1012 return -EINVAL;
1013 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1014 return -EFAULT;
1015 if (gsf.gf_group.ss_family != AF_INET6)
1016 return -EADDRNOTAVAIL;
1017 lock_sock(sk);
1018 err = ip6_mc_msfget(sk, &gsf,
1019 (struct group_filter __user *)optval, optlen);
1020 release_sock(sk);
1021 return err;
1022 }
1023
1024 case IPV6_2292PKTOPTIONS:
1025 {
1026 struct msghdr msg;
1027 struct sk_buff *skb;
1028
1029 if (sk->sk_type != SOCK_STREAM)
1030 return -ENOPROTOOPT;
1031
1032 msg.msg_control = optval;
1033 msg.msg_controllen = len;
1034 msg.msg_flags = flags;
1035
1036 lock_sock(sk);
1037 skb = np->pktoptions;
1038 if (skb)
1039 ip6_datagram_recv_ctl(sk, &msg, skb);
1040 release_sock(sk);
1041 if (!skb) {
1042 if (np->rxopt.bits.rxinfo) {
1043 struct in6_pktinfo src_info;
1044 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1045 np->sticky_pktinfo.ipi6_ifindex;
1046 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1047 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1048 }
1049 if (np->rxopt.bits.rxhlim) {
1050 int hlim = np->mcast_hops;
1051 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1052 }
1053 if (np->rxopt.bits.rxtclass) {
1054 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1055
1056 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1057 }
1058 if (np->rxopt.bits.rxoinfo) {
1059 struct in6_pktinfo src_info;
1060 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1061 np->sticky_pktinfo.ipi6_ifindex;
1062 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1063 np->sticky_pktinfo.ipi6_addr;
1064 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1065 }
1066 if (np->rxopt.bits.rxohlim) {
1067 int hlim = np->mcast_hops;
1068 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1069 }
1070 if (np->rxopt.bits.rxflow) {
1071 __be32 flowinfo = np->rcv_flowinfo;
1072
1073 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1074 }
1075 }
1076 len -= msg.msg_controllen;
1077 return put_user(len, optlen);
1078 }
1079 case IPV6_MTU:
1080 {
1081 struct dst_entry *dst;
1082
1083 val = 0;
1084 rcu_read_lock();
1085 dst = __sk_dst_get(sk);
1086 if (dst)
1087 val = dst_mtu(dst);
1088 rcu_read_unlock();
1089 if (!val)
1090 return -ENOTCONN;
1091 break;
1092 }
1093
1094 case IPV6_V6ONLY:
1095 val = sk->sk_ipv6only;
1096 break;
1097
1098 case IPV6_RECVPKTINFO:
1099 val = np->rxopt.bits.rxinfo;
1100 break;
1101
1102 case IPV6_2292PKTINFO:
1103 val = np->rxopt.bits.rxoinfo;
1104 break;
1105
1106 case IPV6_RECVHOPLIMIT:
1107 val = np->rxopt.bits.rxhlim;
1108 break;
1109
1110 case IPV6_2292HOPLIMIT:
1111 val = np->rxopt.bits.rxohlim;
1112 break;
1113
1114 case IPV6_RECVRTHDR:
1115 val = np->rxopt.bits.srcrt;
1116 break;
1117
1118 case IPV6_2292RTHDR:
1119 val = np->rxopt.bits.osrcrt;
1120 break;
1121
1122 case IPV6_HOPOPTS:
1123 case IPV6_RTHDRDSTOPTS:
1124 case IPV6_RTHDR:
1125 case IPV6_DSTOPTS:
1126 {
1127 struct ipv6_txoptions *opt;
1128
1129 lock_sock(sk);
1130 opt = rcu_dereference_protected(np->opt,
1131 lockdep_sock_is_held(sk));
1132 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1133 release_sock(sk);
1134 /* check if ipv6_getsockopt_sticky() returns err code */
1135 if (len < 0)
1136 return len;
1137 return put_user(len, optlen);
1138 }
1139
1140 case IPV6_RECVHOPOPTS:
1141 val = np->rxopt.bits.hopopts;
1142 break;
1143
1144 case IPV6_2292HOPOPTS:
1145 val = np->rxopt.bits.ohopopts;
1146 break;
1147
1148 case IPV6_RECVDSTOPTS:
1149 val = np->rxopt.bits.dstopts;
1150 break;
1151
1152 case IPV6_2292DSTOPTS:
1153 val = np->rxopt.bits.odstopts;
1154 break;
1155
1156 case IPV6_TCLASS:
1157 val = np->tclass;
1158 break;
1159
1160 case IPV6_RECVTCLASS:
1161 val = np->rxopt.bits.rxtclass;
1162 break;
1163
1164 case IPV6_FLOWINFO:
1165 val = np->rxopt.bits.rxflow;
1166 break;
1167
1168 case IPV6_RECVPATHMTU:
1169 val = np->rxopt.bits.rxpmtu;
1170 break;
1171
1172 case IPV6_PATHMTU:
1173 {
1174 struct dst_entry *dst;
1175 struct ip6_mtuinfo mtuinfo;
1176
1177 if (len < sizeof(mtuinfo))
1178 return -EINVAL;
1179
1180 len = sizeof(mtuinfo);
1181 memset(&mtuinfo, 0, sizeof(mtuinfo));
1182
1183 rcu_read_lock();
1184 dst = __sk_dst_get(sk);
1185 if (dst)
1186 mtuinfo.ip6m_mtu = dst_mtu(dst);
1187 rcu_read_unlock();
1188 if (!mtuinfo.ip6m_mtu)
1189 return -ENOTCONN;
1190
1191 if (put_user(len, optlen))
1192 return -EFAULT;
1193 if (copy_to_user(optval, &mtuinfo, len))
1194 return -EFAULT;
1195
1196 return 0;
1197 }
1198
1199 case IPV6_TRANSPARENT:
1200 val = inet_sk(sk)->transparent;
1201 break;
1202
1203 case IPV6_RECVORIGDSTADDR:
1204 val = np->rxopt.bits.rxorigdstaddr;
1205 break;
1206
1207 case IPV6_UNICAST_HOPS:
1208 case IPV6_MULTICAST_HOPS:
1209 {
1210 struct dst_entry *dst;
1211
1212 if (optname == IPV6_UNICAST_HOPS)
1213 val = np->hop_limit;
1214 else
1215 val = np->mcast_hops;
1216
1217 if (val < 0) {
1218 rcu_read_lock();
1219 dst = __sk_dst_get(sk);
1220 if (dst)
1221 val = ip6_dst_hoplimit(dst);
1222 rcu_read_unlock();
1223 }
1224
1225 if (val < 0)
1226 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1227 break;
1228 }
1229
1230 case IPV6_MULTICAST_LOOP:
1231 val = np->mc_loop;
1232 break;
1233
1234 case IPV6_MULTICAST_IF:
1235 val = np->mcast_oif;
1236 break;
1237
1238 case IPV6_UNICAST_IF:
1239 val = (__force int)htonl((__u32) np->ucast_oif);
1240 break;
1241
1242 case IPV6_MTU_DISCOVER:
1243 val = np->pmtudisc;
1244 break;
1245
1246 case IPV6_RECVERR:
1247 val = np->recverr;
1248 break;
1249
1250 case IPV6_FLOWINFO_SEND:
1251 val = np->sndflow;
1252 break;
1253
1254 case IPV6_FLOWLABEL_MGR:
1255 {
1256 struct in6_flowlabel_req freq;
1257 int flags;
1258
1259 if (len < sizeof(freq))
1260 return -EINVAL;
1261
1262 if (copy_from_user(&freq, optval, sizeof(freq)))
1263 return -EFAULT;
1264
1265 if (freq.flr_action != IPV6_FL_A_GET)
1266 return -EINVAL;
1267
1268 len = sizeof(freq);
1269 flags = freq.flr_flags;
1270
1271 memset(&freq, 0, sizeof(freq));
1272
1273 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1274 if (val < 0)
1275 return val;
1276
1277 if (put_user(len, optlen))
1278 return -EFAULT;
1279 if (copy_to_user(optval, &freq, len))
1280 return -EFAULT;
1281
1282 return 0;
1283 }
1284
1285 case IPV6_ADDR_PREFERENCES:
1286 val = 0;
1287
1288 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1289 val |= IPV6_PREFER_SRC_TMP;
1290 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1291 val |= IPV6_PREFER_SRC_PUBLIC;
1292 else {
1293 /* XXX: should we return system default? */
1294 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1295 }
1296
1297 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1298 val |= IPV6_PREFER_SRC_COA;
1299 else
1300 val |= IPV6_PREFER_SRC_HOME;
1301 break;
1302
1303 case IPV6_MINHOPCOUNT:
1304 val = np->min_hopcount;
1305 break;
1306
1307 case IPV6_DONTFRAG:
1308 val = np->dontfrag;
1309 break;
1310
1311 case IPV6_AUTOFLOWLABEL:
1312 val = ip6_autoflowlabel(sock_net(sk), np);
1313 break;
1314
1315 default:
1316 return -ENOPROTOOPT;
1317 }
1318 len = min_t(unsigned int, sizeof(int), len);
1319 if (put_user(len, optlen))
1320 return -EFAULT;
1321 if (copy_to_user(optval, &val, len))
1322 return -EFAULT;
1323 return 0;
1324 }
1325
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1326 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1327 char __user *optval, int __user *optlen)
1328 {
1329 int err;
1330
1331 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1332 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1333
1334 if (level != SOL_IPV6)
1335 return -ENOPROTOOPT;
1336
1337 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1338 #ifdef CONFIG_NETFILTER
1339 /* we need to exclude all possible ENOPROTOOPTs except default case */
1340 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1341 int len;
1342
1343 if (get_user(len, optlen))
1344 return -EFAULT;
1345
1346 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1347 if (err >= 0)
1348 err = put_user(len, optlen);
1349 }
1350 #endif
1351 return err;
1352 }
1353 EXPORT_SYMBOL(ipv6_getsockopt);
1354
1355 #ifdef CONFIG_COMPAT
compat_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1356 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1357 char __user *optval, int __user *optlen)
1358 {
1359 int err;
1360
1361 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1362 if (udp_prot.compat_getsockopt != NULL)
1363 return udp_prot.compat_getsockopt(sk, level, optname,
1364 optval, optlen);
1365 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1366 }
1367
1368 if (level != SOL_IPV6)
1369 return -ENOPROTOOPT;
1370
1371 if (optname == MCAST_MSFILTER)
1372 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1373 ipv6_getsockopt);
1374
1375 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1376 MSG_CMSG_COMPAT);
1377 #ifdef CONFIG_NETFILTER
1378 /* we need to exclude all possible ENOPROTOOPTs except default case */
1379 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1380 int len;
1381
1382 if (get_user(len, optlen))
1383 return -EFAULT;
1384
1385 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1386 if (err >= 0)
1387 err = put_user(len, optlen);
1388 }
1389 #endif
1390 return err;
1391 }
1392 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1393 #endif
1394
1395