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Linux 5.1.15
[linux/fpc-iii.git] / net / ipv6 / ipv6_sockglue.c
blob40f21fef25ff459b0d2ec17c5679e29bf435297f
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_FREEBIND:
381 if (optlen < sizeof(int))
382 goto e_inval;
383 /* we also don't have a separate freebind bit for IPV6 */
384 inet_sk(sk)->freebind = valbool;
385 retv = 0;
386 break;
387
388 case IPV6_RECVORIGDSTADDR:
389 if (optlen < sizeof(int))
390 goto e_inval;
391 np->rxopt.bits.rxorigdstaddr = valbool;
392 retv = 0;
393 break;
394
395 case IPV6_HOPOPTS:
396 case IPV6_RTHDRDSTOPTS:
397 case IPV6_RTHDR:
398 case IPV6_DSTOPTS:
399 {
400 struct ipv6_txoptions *opt;
401 struct ipv6_opt_hdr *new = NULL;
402
403 /* hop-by-hop / destination options are privileged option */
404 retv = -EPERM;
405 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
406 break;
407
408 /* remove any sticky options header with a zero option
409 * length, per RFC3542.
410 */
411 if (optlen == 0)
412 optval = NULL;
413 else if (!optval)
414 goto e_inval;
415 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
416 optlen & 0x7 || optlen > 8 * 255)
417 goto e_inval;
418 else {
419 new = memdup_user(optval, optlen);
420 if (IS_ERR(new)) {
421 retv = PTR_ERR(new);
422 break;
423 }
424 if (unlikely(ipv6_optlen(new) > optlen)) {
425 kfree(new);
426 goto e_inval;
427 }
428 }
429
430 opt = rcu_dereference_protected(np->opt,
431 lockdep_sock_is_held(sk));
432 opt = ipv6_renew_options(sk, opt, optname, new);
433 kfree(new);
434 if (IS_ERR(opt)) {
435 retv = PTR_ERR(opt);
436 break;
437 }
438
439 /* routing header option needs extra check */
440 retv = -EINVAL;
441 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
442 struct ipv6_rt_hdr *rthdr = opt->srcrt;
443 switch (rthdr->type) {
444 #if IS_ENABLED(CONFIG_IPV6_MIP6)
445 case IPV6_SRCRT_TYPE_2:
446 if (rthdr->hdrlen != 2 ||
447 rthdr->segments_left != 1)
448 goto sticky_done;
449
450 break;
451 #endif
452 case IPV6_SRCRT_TYPE_4:
453 {
454 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
455 opt->srcrt;
456
457 if (!seg6_validate_srh(srh, optlen))
458 goto sticky_done;
459 break;
460 }
461 default:
462 goto sticky_done;
463 }
464 }
465
466 retv = 0;
467 opt = ipv6_update_options(sk, opt);
468 sticky_done:
469 if (opt) {
470 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
471 txopt_put(opt);
472 }
473 break;
474 }
475
476 case IPV6_PKTINFO:
477 {
478 struct in6_pktinfo pkt;
479
480 if (optlen == 0)
481 goto e_inval;
482 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
483 goto e_inval;
484
485 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
486 retv = -EFAULT;
487 break;
488 }
489 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
490 goto e_inval;
491
492 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
493 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
494 retv = 0;
495 break;
496 }
497
498 case IPV6_2292PKTOPTIONS:
499 {
500 struct ipv6_txoptions *opt = NULL;
501 struct msghdr msg;
502 struct flowi6 fl6;
503 struct ipcm6_cookie ipc6;
504
505 memset(&fl6, 0, sizeof(fl6));
506 fl6.flowi6_oif = sk->sk_bound_dev_if;
507 fl6.flowi6_mark = sk->sk_mark;
508
509 if (optlen == 0)
510 goto update;
511
512 /* 1K is probably excessive
513 * 1K is surely not enough, 2K per standard header is 16K.
514 */
515 retv = -EINVAL;
516 if (optlen > 64*1024)
517 break;
518
519 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
520 retv = -ENOBUFS;
521 if (!opt)
522 break;
523
524 memset(opt, 0, sizeof(*opt));
525 refcount_set(&opt->refcnt, 1);
526 opt->tot_len = sizeof(*opt) + optlen;
527 retv = -EFAULT;
528 if (copy_from_user(opt+1, optval, optlen))
529 goto done;
530
531 msg.msg_controllen = optlen;
532 msg.msg_control = (void *)(opt+1);
533 ipc6.opt = opt;
534
535 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
536 if (retv)
537 goto done;
538 update:
539 retv = 0;
540 opt = ipv6_update_options(sk, opt);
541 done:
542 if (opt) {
543 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
544 txopt_put(opt);
545 }
546 break;
547 }
548 case IPV6_UNICAST_HOPS:
549 if (optlen < sizeof(int))
550 goto e_inval;
551 if (val > 255 || val < -1)
552 goto e_inval;
553 np->hop_limit = val;
554 retv = 0;
555 break;
556
557 case IPV6_MULTICAST_HOPS:
558 if (sk->sk_type == SOCK_STREAM)
559 break;
560 if (optlen < sizeof(int))
561 goto e_inval;
562 if (val > 255 || val < -1)
563 goto e_inval;
564 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
565 retv = 0;
566 break;
567
568 case IPV6_MULTICAST_LOOP:
569 if (optlen < sizeof(int))
570 goto e_inval;
571 if (val != valbool)
572 goto e_inval;
573 np->mc_loop = valbool;
574 retv = 0;
575 break;
576
577 case IPV6_UNICAST_IF:
578 {
579 struct net_device *dev = NULL;
580 int ifindex;
581
582 if (optlen != sizeof(int))
583 goto e_inval;
584
585 ifindex = (__force int)ntohl((__force __be32)val);
586 if (ifindex == 0) {
587 np->ucast_oif = 0;
588 retv = 0;
589 break;
590 }
591
592 dev = dev_get_by_index(net, ifindex);
593 retv = -EADDRNOTAVAIL;
594 if (!dev)
595 break;
596 dev_put(dev);
597
598 retv = -EINVAL;
599 if (sk->sk_bound_dev_if)
600 break;
601
602 np->ucast_oif = ifindex;
603 retv = 0;
604 break;
605 }
606
607 case IPV6_MULTICAST_IF:
608 if (sk->sk_type == SOCK_STREAM)
609 break;
610 if (optlen < sizeof(int))
611 goto e_inval;
612
613 if (val) {
614 struct net_device *dev;
615 int midx;
616
617 rcu_read_lock();
618
619 dev = dev_get_by_index_rcu(net, val);
620 if (!dev) {
621 rcu_read_unlock();
622 retv = -ENODEV;
623 break;
624 }
625 midx = l3mdev_master_ifindex_rcu(dev);
626
627 rcu_read_unlock();
628
629 if (sk->sk_bound_dev_if &&
630 sk->sk_bound_dev_if != val &&
631 (!midx || midx != sk->sk_bound_dev_if))
632 goto e_inval;
633 }
634 np->mcast_oif = val;
635 retv = 0;
636 break;
637 case IPV6_ADD_MEMBERSHIP:
638 case IPV6_DROP_MEMBERSHIP:
639 {
640 struct ipv6_mreq mreq;
641
642 if (optlen < sizeof(struct ipv6_mreq))
643 goto e_inval;
644
645 retv = -EPROTO;
646 if (inet_sk(sk)->is_icsk)
647 break;
648
649 retv = -EFAULT;
650 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
651 break;
652
653 if (optname == IPV6_ADD_MEMBERSHIP)
654 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
655 else
656 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
657 break;
658 }
659 case IPV6_JOIN_ANYCAST:
660 case IPV6_LEAVE_ANYCAST:
661 {
662 struct ipv6_mreq mreq;
663
664 if (optlen < sizeof(struct ipv6_mreq))
665 goto e_inval;
666
667 retv = -EFAULT;
668 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
669 break;
670
671 if (optname == IPV6_JOIN_ANYCAST)
672 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
673 else
674 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
675 break;
676 }
677 case IPV6_MULTICAST_ALL:
678 if (optlen < sizeof(int))
679 goto e_inval;
680 np->mc_all = valbool;
681 retv = 0;
682 break;
683
684 case MCAST_JOIN_GROUP:
685 case MCAST_LEAVE_GROUP:
686 {
687 struct group_req greq;
688 struct sockaddr_in6 *psin6;
689
690 if (optlen < sizeof(struct group_req))
691 goto e_inval;
692
693 retv = -EFAULT;
694 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
695 break;
696 if (greq.gr_group.ss_family != AF_INET6) {
697 retv = -EADDRNOTAVAIL;
698 break;
699 }
700 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
701 if (optname == MCAST_JOIN_GROUP)
702 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
703 &psin6->sin6_addr);
704 else
705 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
706 &psin6->sin6_addr);
707 break;
708 }
709 case MCAST_JOIN_SOURCE_GROUP:
710 case MCAST_LEAVE_SOURCE_GROUP:
711 case MCAST_BLOCK_SOURCE:
712 case MCAST_UNBLOCK_SOURCE:
713 {
714 struct group_source_req greqs;
715 int omode, add;
716
717 if (optlen < sizeof(struct group_source_req))
718 goto e_inval;
719 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
720 retv = -EFAULT;
721 break;
722 }
723 if (greqs.gsr_group.ss_family != AF_INET6 ||
724 greqs.gsr_source.ss_family != AF_INET6) {
725 retv = -EADDRNOTAVAIL;
726 break;
727 }
728 if (optname == MCAST_BLOCK_SOURCE) {
729 omode = MCAST_EXCLUDE;
730 add = 1;
731 } else if (optname == MCAST_UNBLOCK_SOURCE) {
732 omode = MCAST_EXCLUDE;
733 add = 0;
734 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
735 struct sockaddr_in6 *psin6;
736
737 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
738 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
739 &psin6->sin6_addr,
740 MCAST_INCLUDE);
741 /* prior join w/ different source is ok */
742 if (retv && retv != -EADDRINUSE)
743 break;
744 omode = MCAST_INCLUDE;
745 add = 1;
746 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
747 omode = MCAST_INCLUDE;
748 add = 0;
749 }
750 retv = ip6_mc_source(add, omode, sk, &greqs);
751 break;
752 }
753 case MCAST_MSFILTER:
754 {
755 struct group_filter *gsf;
756
757 if (optlen < GROUP_FILTER_SIZE(0))
758 goto e_inval;
759 if (optlen > sysctl_optmem_max) {
760 retv = -ENOBUFS;
761 break;
762 }
763 gsf = memdup_user(optval, optlen);
764 if (IS_ERR(gsf)) {
765 retv = PTR_ERR(gsf);
766 break;
767 }
768 /* numsrc >= (4G-140)/128 overflow in 32 bits */
769 if (gsf->gf_numsrc >= 0x1ffffffU ||
770 gsf->gf_numsrc > sysctl_mld_max_msf) {
771 kfree(gsf);
772 retv = -ENOBUFS;
773 break;
774 }
775 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
776 kfree(gsf);
777 retv = -EINVAL;
778 break;
779 }
780 retv = ip6_mc_msfilter(sk, gsf);
781 kfree(gsf);
782
783 break;
784 }
785 case IPV6_ROUTER_ALERT:
786 if (optlen < sizeof(int))
787 goto e_inval;
788 retv = ip6_ra_control(sk, val);
789 break;
790 case IPV6_ROUTER_ALERT_ISOLATE:
791 if (optlen < sizeof(int))
792 goto e_inval;
793 np->rtalert_isolate = valbool;
794 retv = 0;
795 break;
796 case IPV6_MTU_DISCOVER:
797 if (optlen < sizeof(int))
798 goto e_inval;
799 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
800 goto e_inval;
801 np->pmtudisc = val;
802 retv = 0;
803 break;
804 case IPV6_MTU:
805 if (optlen < sizeof(int))
806 goto e_inval;
807 if (val && val < IPV6_MIN_MTU)
808 goto e_inval;
809 np->frag_size = val;
810 retv = 0;
811 break;
812 case IPV6_RECVERR:
813 if (optlen < sizeof(int))
814 goto e_inval;
815 np->recverr = valbool;
816 if (!val)
817 skb_queue_purge(&sk->sk_error_queue);
818 retv = 0;
819 break;
820 case IPV6_FLOWINFO_SEND:
821 if (optlen < sizeof(int))
822 goto e_inval;
823 np->sndflow = valbool;
824 retv = 0;
825 break;
826 case IPV6_FLOWLABEL_MGR:
827 retv = ipv6_flowlabel_opt(sk, optval, optlen);
828 break;
829 case IPV6_IPSEC_POLICY:
830 case IPV6_XFRM_POLICY:
831 retv = -EPERM;
832 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
833 break;
834 retv = xfrm_user_policy(sk, optname, optval, optlen);
835 break;
836
837 case IPV6_ADDR_PREFERENCES:
838 {
839 unsigned int pref = 0;
840 unsigned int prefmask = ~0;
841
842 if (optlen < sizeof(int))
843 goto e_inval;
844
845 retv = -EINVAL;
846
847 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
848 switch (val & (IPV6_PREFER_SRC_PUBLIC|
849 IPV6_PREFER_SRC_TMP|
850 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
851 case IPV6_PREFER_SRC_PUBLIC:
852 pref |= IPV6_PREFER_SRC_PUBLIC;
853 break;
854 case IPV6_PREFER_SRC_TMP:
855 pref |= IPV6_PREFER_SRC_TMP;
856 break;
857 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
858 break;
859 case 0:
860 goto pref_skip_pubtmp;
861 default:
862 goto e_inval;
863 }
864
865 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
866 IPV6_PREFER_SRC_TMP);
867 pref_skip_pubtmp:
868
869 /* check HOME/COA conflicts */
870 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
871 case IPV6_PREFER_SRC_HOME:
872 break;
873 case IPV6_PREFER_SRC_COA:
874 pref |= IPV6_PREFER_SRC_COA;
875 case 0:
876 goto pref_skip_coa;
877 default:
878 goto e_inval;
879 }
880
881 prefmask &= ~IPV6_PREFER_SRC_COA;
882 pref_skip_coa:
883
884 /* check CGA/NONCGA conflicts */
885 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
886 case IPV6_PREFER_SRC_CGA:
887 case IPV6_PREFER_SRC_NONCGA:
888 case 0:
889 break;
890 default:
891 goto e_inval;
892 }
893
894 np->srcprefs = (np->srcprefs & prefmask) | pref;
895 retv = 0;
896
897 break;
898 }
899 case IPV6_MINHOPCOUNT:
900 if (optlen < sizeof(int))
901 goto e_inval;
902 if (val < 0 || val > 255)
903 goto e_inval;
904 np->min_hopcount = val;
905 retv = 0;
906 break;
907 case IPV6_DONTFRAG:
908 np->dontfrag = valbool;
909 retv = 0;
910 break;
911 case IPV6_AUTOFLOWLABEL:
912 np->autoflowlabel = valbool;
913 np->autoflowlabel_set = 1;
914 retv = 0;
915 break;
916 case IPV6_RECVFRAGSIZE:
917 np->rxopt.bits.recvfragsize = valbool;
918 retv = 0;
919 break;
920 }
921
922 release_sock(sk);
923 if (needs_rtnl)
924 rtnl_unlock();
925
926 return retv;
927
928 e_inval:
929 release_sock(sk);
930 if (needs_rtnl)
931 rtnl_unlock();
932 return -EINVAL;
933 }
934
935 int ipv6_setsockopt(struct sock *sk, int level, int optname,
936 char __user *optval, unsigned int optlen)
937 {
938 int err;
939
940 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
941 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
942
943 if (level != SOL_IPV6)
944 return -ENOPROTOOPT;
945
946 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
947 #ifdef CONFIG_NETFILTER
948 /* we need to exclude all possible ENOPROTOOPTs except default case */
949 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
950 optname != IPV6_XFRM_POLICY)
951 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
952 #endif
953 return err;
954 }
955 EXPORT_SYMBOL(ipv6_setsockopt);
956
957 #ifdef CONFIG_COMPAT
958 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
959 char __user *optval, unsigned int optlen)
960 {
961 int err;
962
963 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
964 if (udp_prot.compat_setsockopt != NULL)
965 return udp_prot.compat_setsockopt(sk, level, optname,
966 optval, optlen);
967 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
968 }
969
970 if (level != SOL_IPV6)
971 return -ENOPROTOOPT;
972
973 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
974 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
975 ipv6_setsockopt);
976
977 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
978 #ifdef CONFIG_NETFILTER
979 /* we need to exclude all possible ENOPROTOOPTs except default case */
980 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
981 optname != IPV6_XFRM_POLICY)
982 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
983 optlen);
984 #endif
985 return err;
986 }
987 EXPORT_SYMBOL(compat_ipv6_setsockopt);
988 #endif
989
990 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
991 int optname, char __user *optval, int len)
992 {
993 struct ipv6_opt_hdr *hdr;
994
995 if (!opt)
996 return 0;
997
998 switch (optname) {
999 case IPV6_HOPOPTS:
1000 hdr = opt->hopopt;
1001 break;
1002 case IPV6_RTHDRDSTOPTS:
1003 hdr = opt->dst0opt;
1004 break;
1005 case IPV6_RTHDR:
1006 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1007 break;
1008 case IPV6_DSTOPTS:
1009 hdr = opt->dst1opt;
1010 break;
1011 default:
1012 return -EINVAL; /* should not happen */
1013 }
1014
1015 if (!hdr)
1016 return 0;
1017
1018 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1019 if (copy_to_user(optval, hdr, len))
1020 return -EFAULT;
1021 return len;
1022 }
1023
1024 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1025 char __user *optval, int __user *optlen, unsigned int flags)
1026 {
1027 struct ipv6_pinfo *np = inet6_sk(sk);
1028 int len;
1029 int val;
1030
1031 if (ip6_mroute_opt(optname))
1032 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1033
1034 if (get_user(len, optlen))
1035 return -EFAULT;
1036 switch (optname) {
1037 case IPV6_ADDRFORM:
1038 if (sk->sk_protocol != IPPROTO_UDP &&
1039 sk->sk_protocol != IPPROTO_UDPLITE &&
1040 sk->sk_protocol != IPPROTO_TCP)
1041 return -ENOPROTOOPT;
1042 if (sk->sk_state != TCP_ESTABLISHED)
1043 return -ENOTCONN;
1044 val = sk->sk_family;
1045 break;
1046 case MCAST_MSFILTER:
1047 {
1048 struct group_filter gsf;
1049 int err;
1050
1051 if (len < GROUP_FILTER_SIZE(0))
1052 return -EINVAL;
1053 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1054 return -EFAULT;
1055 if (gsf.gf_group.ss_family != AF_INET6)
1056 return -EADDRNOTAVAIL;
1057 lock_sock(sk);
1058 err = ip6_mc_msfget(sk, &gsf,
1059 (struct group_filter __user *)optval, optlen);
1060 release_sock(sk);
1061 return err;
1062 }
1063
1064 case IPV6_2292PKTOPTIONS:
1065 {
1066 struct msghdr msg;
1067 struct sk_buff *skb;
1068
1069 if (sk->sk_type != SOCK_STREAM)
1070 return -ENOPROTOOPT;
1071
1072 msg.msg_control = optval;
1073 msg.msg_controllen = len;
1074 msg.msg_flags = flags;
1075
1076 lock_sock(sk);
1077 skb = np->pktoptions;
1078 if (skb)
1079 ip6_datagram_recv_ctl(sk, &msg, skb);
1080 release_sock(sk);
1081 if (!skb) {
1082 if (np->rxopt.bits.rxinfo) {
1083 struct in6_pktinfo src_info;
1084 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1085 np->sticky_pktinfo.ipi6_ifindex;
1086 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1087 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1088 }
1089 if (np->rxopt.bits.rxhlim) {
1090 int hlim = np->mcast_hops;
1091 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1092 }
1093 if (np->rxopt.bits.rxtclass) {
1094 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1095
1096 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1097 }
1098 if (np->rxopt.bits.rxoinfo) {
1099 struct in6_pktinfo src_info;
1100 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1101 np->sticky_pktinfo.ipi6_ifindex;
1102 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1103 np->sticky_pktinfo.ipi6_addr;
1104 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1105 }
1106 if (np->rxopt.bits.rxohlim) {
1107 int hlim = np->mcast_hops;
1108 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1109 }
1110 if (np->rxopt.bits.rxflow) {
1111 __be32 flowinfo = np->rcv_flowinfo;
1112
1113 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1114 }
1115 }
1116 len -= msg.msg_controllen;
1117 return put_user(len, optlen);
1118 }
1119 case IPV6_MTU:
1120 {
1121 struct dst_entry *dst;
1122
1123 val = 0;
1124 rcu_read_lock();
1125 dst = __sk_dst_get(sk);
1126 if (dst)
1127 val = dst_mtu(dst);
1128 rcu_read_unlock();
1129 if (!val)
1130 return -ENOTCONN;
1131 break;
1132 }
1133
1134 case IPV6_V6ONLY:
1135 val = sk->sk_ipv6only;
1136 break;
1137
1138 case IPV6_RECVPKTINFO:
1139 val = np->rxopt.bits.rxinfo;
1140 break;
1141
1142 case IPV6_2292PKTINFO:
1143 val = np->rxopt.bits.rxoinfo;
1144 break;
1145
1146 case IPV6_RECVHOPLIMIT:
1147 val = np->rxopt.bits.rxhlim;
1148 break;
1149
1150 case IPV6_2292HOPLIMIT:
1151 val = np->rxopt.bits.rxohlim;
1152 break;
1153
1154 case IPV6_RECVRTHDR:
1155 val = np->rxopt.bits.srcrt;
1156 break;
1157
1158 case IPV6_2292RTHDR:
1159 val = np->rxopt.bits.osrcrt;
1160 break;
1161
1162 case IPV6_HOPOPTS:
1163 case IPV6_RTHDRDSTOPTS:
1164 case IPV6_RTHDR:
1165 case IPV6_DSTOPTS:
1166 {
1167 struct ipv6_txoptions *opt;
1168
1169 lock_sock(sk);
1170 opt = rcu_dereference_protected(np->opt,
1171 lockdep_sock_is_held(sk));
1172 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1173 release_sock(sk);
1174 /* check if ipv6_getsockopt_sticky() returns err code */
1175 if (len < 0)
1176 return len;
1177 return put_user(len, optlen);
1178 }
1179
1180 case IPV6_RECVHOPOPTS:
1181 val = np->rxopt.bits.hopopts;
1182 break;
1183
1184 case IPV6_2292HOPOPTS:
1185 val = np->rxopt.bits.ohopopts;
1186 break;
1187
1188 case IPV6_RECVDSTOPTS:
1189 val = np->rxopt.bits.dstopts;
1190 break;
1191
1192 case IPV6_2292DSTOPTS:
1193 val = np->rxopt.bits.odstopts;
1194 break;
1195
1196 case IPV6_TCLASS:
1197 val = np->tclass;
1198 break;
1199
1200 case IPV6_RECVTCLASS:
1201 val = np->rxopt.bits.rxtclass;
1202 break;
1203
1204 case IPV6_FLOWINFO:
1205 val = np->rxopt.bits.rxflow;
1206 break;
1207
1208 case IPV6_RECVPATHMTU:
1209 val = np->rxopt.bits.rxpmtu;
1210 break;
1211
1212 case IPV6_PATHMTU:
1213 {
1214 struct dst_entry *dst;
1215 struct ip6_mtuinfo mtuinfo;
1216
1217 if (len < sizeof(mtuinfo))
1218 return -EINVAL;
1219
1220 len = sizeof(mtuinfo);
1221 memset(&mtuinfo, 0, sizeof(mtuinfo));
1222
1223 rcu_read_lock();
1224 dst = __sk_dst_get(sk);
1225 if (dst)
1226 mtuinfo.ip6m_mtu = dst_mtu(dst);
1227 rcu_read_unlock();
1228 if (!mtuinfo.ip6m_mtu)
1229 return -ENOTCONN;
1230
1231 if (put_user(len, optlen))
1232 return -EFAULT;
1233 if (copy_to_user(optval, &mtuinfo, len))
1234 return -EFAULT;
1235
1236 return 0;
1237 }
1238
1239 case IPV6_TRANSPARENT:
1240 val = inet_sk(sk)->transparent;
1241 break;
1242
1243 case IPV6_FREEBIND:
1244 val = inet_sk(sk)->freebind;
1245 break;
1246
1247 case IPV6_RECVORIGDSTADDR:
1248 val = np->rxopt.bits.rxorigdstaddr;
1249 break;
1250
1251 case IPV6_UNICAST_HOPS:
1252 case IPV6_MULTICAST_HOPS:
1253 {
1254 struct dst_entry *dst;
1255
1256 if (optname == IPV6_UNICAST_HOPS)
1257 val = np->hop_limit;
1258 else
1259 val = np->mcast_hops;
1260
1261 if (val < 0) {
1262 rcu_read_lock();
1263 dst = __sk_dst_get(sk);
1264 if (dst)
1265 val = ip6_dst_hoplimit(dst);
1266 rcu_read_unlock();
1267 }
1268
1269 if (val < 0)
1270 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1271 break;
1272 }
1273
1274 case IPV6_MULTICAST_LOOP:
1275 val = np->mc_loop;
1276 break;
1277
1278 case IPV6_MULTICAST_IF:
1279 val = np->mcast_oif;
1280 break;
1281
1282 case IPV6_MULTICAST_ALL:
1283 val = np->mc_all;
1284 break;
1285
1286 case IPV6_UNICAST_IF:
1287 val = (__force int)htonl((__u32) np->ucast_oif);
1288 break;
1289
1290 case IPV6_MTU_DISCOVER:
1291 val = np->pmtudisc;
1292 break;
1293
1294 case IPV6_RECVERR:
1295 val = np->recverr;
1296 break;
1297
1298 case IPV6_FLOWINFO_SEND:
1299 val = np->sndflow;
1300 break;
1301
1302 case IPV6_FLOWLABEL_MGR:
1303 {
1304 struct in6_flowlabel_req freq;
1305 int flags;
1306
1307 if (len < sizeof(freq))
1308 return -EINVAL;
1309
1310 if (copy_from_user(&freq, optval, sizeof(freq)))
1311 return -EFAULT;
1312
1313 if (freq.flr_action != IPV6_FL_A_GET)
1314 return -EINVAL;
1315
1316 len = sizeof(freq);
1317 flags = freq.flr_flags;
1318
1319 memset(&freq, 0, sizeof(freq));
1320
1321 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1322 if (val < 0)
1323 return val;
1324
1325 if (put_user(len, optlen))
1326 return -EFAULT;
1327 if (copy_to_user(optval, &freq, len))
1328 return -EFAULT;
1329
1330 return 0;
1331 }
1332
1333 case IPV6_ADDR_PREFERENCES:
1334 val = 0;
1335
1336 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1337 val |= IPV6_PREFER_SRC_TMP;
1338 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1339 val |= IPV6_PREFER_SRC_PUBLIC;
1340 else {
1341 /* XXX: should we return system default? */
1342 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1343 }
1344
1345 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1346 val |= IPV6_PREFER_SRC_COA;
1347 else
1348 val |= IPV6_PREFER_SRC_HOME;
1349 break;
1350
1351 case IPV6_MINHOPCOUNT:
1352 val = np->min_hopcount;
1353 break;
1354
1355 case IPV6_DONTFRAG:
1356 val = np->dontfrag;
1357 break;
1358
1359 case IPV6_AUTOFLOWLABEL:
1360 val = ip6_autoflowlabel(sock_net(sk), np);
1361 break;
1362
1363 case IPV6_RECVFRAGSIZE:
1364 val = np->rxopt.bits.recvfragsize;
1365 break;
1366
1367 case IPV6_ROUTER_ALERT_ISOLATE:
1368 val = np->rtalert_isolate;
1369 break;
1370
1371 default:
1372 return -ENOPROTOOPT;
1373 }
1374 len = min_t(unsigned int, sizeof(int), len);
1375 if (put_user(len, optlen))
1376 return -EFAULT;
1377 if (copy_to_user(optval, &val, len))
1378 return -EFAULT;
1379 return 0;
1380 }
1381
1382 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1383 char __user *optval, int __user *optlen)
1384 {
1385 int err;
1386
1387 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1388 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1389
1390 if (level != SOL_IPV6)
1391 return -ENOPROTOOPT;
1392
1393 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1394 #ifdef CONFIG_NETFILTER
1395 /* we need to exclude all possible ENOPROTOOPTs except default case */
1396 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1397 int len;
1398
1399 if (get_user(len, optlen))
1400 return -EFAULT;
1401
1402 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1403 if (err >= 0)
1404 err = put_user(len, optlen);
1405 }
1406 #endif
1407 return err;
1408 }
1409 EXPORT_SYMBOL(ipv6_getsockopt);
1410
1411 #ifdef CONFIG_COMPAT
1412 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1413 char __user *optval, int __user *optlen)
1414 {
1415 int err;
1416
1417 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1418 if (udp_prot.compat_getsockopt != NULL)
1419 return udp_prot.compat_getsockopt(sk, level, optname,
1420 optval, optlen);
1421 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1422 }
1423
1424 if (level != SOL_IPV6)
1425 return -ENOPROTOOPT;
1426
1427 if (optname == MCAST_MSFILTER)
1428 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1429 ipv6_getsockopt);
1430
1431 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1432 MSG_CMSG_COMPAT);
1433 #ifdef CONFIG_NETFILTER
1434 /* we need to exclude all possible ENOPROTOOPTs except default case */
1435 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1436 int len;
1437
1438 if (get_user(len, optlen))
1439 return -EFAULT;
1440
1441 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1442 if (err >= 0)
1443 err = put_user(len, optlen);
1444 }
1445 #endif
1446 return err;
1447 }
1448 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1449 #endif
Linux with added FPC-III support