Loading...
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
58struct ip6_ra_chain *ip6_ra_chain;
59DEFINE_RWLOCK(ip6_ra_lock);
60
61int 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 == NULL) {
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
101static
102struct 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 opt = xchg(&inet6_sk(sk)->opt, opt);
114 } else {
115 spin_lock(&sk->sk_dst_lock);
116 opt = xchg(&inet6_sk(sk)->opt, opt);
117 spin_unlock(&sk->sk_dst_lock);
118 }
119 sk_dst_reset(sk);
120
121 return opt;
122}
123
124static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
125 char __user *optval, unsigned int optlen)
126{
127 struct ipv6_pinfo *np = inet6_sk(sk);
128 struct net *net = sock_net(sk);
129 int val, valbool;
130 int retv = -ENOPROTOOPT;
131
132 if (optval == NULL)
133 val=0;
134 else {
135 if (optlen >= sizeof(int)) {
136 if (get_user(val, (int __user *) optval))
137 return -EFAULT;
138 } else
139 val = 0;
140 }
141
142 valbool = (val!=0);
143
144 if (ip6_mroute_opt(optname))
145 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
146
147 lock_sock(sk);
148
149 switch (optname) {
150
151 case IPV6_ADDRFORM:
152 if (optlen < sizeof(int))
153 goto e_inval;
154 if (val == PF_INET) {
155 struct ipv6_txoptions *opt;
156 struct sk_buff *pktopt;
157
158 if (sk->sk_type == SOCK_RAW)
159 break;
160
161 if (sk->sk_protocol == IPPROTO_UDP ||
162 sk->sk_protocol == IPPROTO_UDPLITE) {
163 struct udp_sock *up = udp_sk(sk);
164 if (up->pending == AF_INET6) {
165 retv = -EBUSY;
166 break;
167 }
168 } else if (sk->sk_protocol != IPPROTO_TCP)
169 break;
170
171 if (sk->sk_state != TCP_ESTABLISHED) {
172 retv = -ENOTCONN;
173 break;
174 }
175
176 if (ipv6_only_sock(sk) ||
177 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
178 retv = -EADDRNOTAVAIL;
179 break;
180 }
181
182 fl6_free_socklist(sk);
183 ipv6_sock_mc_close(sk);
184
185 /*
186 * Sock is moving from IPv6 to IPv4 (sk_prot), so
187 * remove it from the refcnt debug socks count in the
188 * original family...
189 */
190 sk_refcnt_debug_dec(sk);
191
192 if (sk->sk_protocol == IPPROTO_TCP) {
193 struct inet_connection_sock *icsk = inet_csk(sk);
194 local_bh_disable();
195 sock_prot_inuse_add(net, sk->sk_prot, -1);
196 sock_prot_inuse_add(net, &tcp_prot, 1);
197 local_bh_enable();
198 sk->sk_prot = &tcp_prot;
199 icsk->icsk_af_ops = &ipv4_specific;
200 sk->sk_socket->ops = &inet_stream_ops;
201 sk->sk_family = PF_INET;
202 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
203 } else {
204 struct proto *prot = &udp_prot;
205
206 if (sk->sk_protocol == IPPROTO_UDPLITE)
207 prot = &udplite_prot;
208 local_bh_disable();
209 sock_prot_inuse_add(net, sk->sk_prot, -1);
210 sock_prot_inuse_add(net, prot, 1);
211 local_bh_enable();
212 sk->sk_prot = prot;
213 sk->sk_socket->ops = &inet_dgram_ops;
214 sk->sk_family = PF_INET;
215 }
216 opt = xchg(&np->opt, NULL);
217 if (opt)
218 sock_kfree_s(sk, opt, opt->tot_len);
219 pktopt = xchg(&np->pktoptions, NULL);
220 kfree_skb(pktopt);
221
222 sk->sk_destruct = inet_sock_destruct;
223 /*
224 * ... and add it to the refcnt debug socks count
225 * in the new family. -acme
226 */
227 sk_refcnt_debug_inc(sk);
228 module_put(THIS_MODULE);
229 retv = 0;
230 break;
231 }
232 goto e_inval;
233
234 case IPV6_V6ONLY:
235 if (optlen < sizeof(int) ||
236 inet_sk(sk)->inet_num)
237 goto e_inval;
238 np->ipv6only = valbool;
239 retv = 0;
240 break;
241
242 case IPV6_RECVPKTINFO:
243 if (optlen < sizeof(int))
244 goto e_inval;
245 np->rxopt.bits.rxinfo = valbool;
246 retv = 0;
247 break;
248
249 case IPV6_2292PKTINFO:
250 if (optlen < sizeof(int))
251 goto e_inval;
252 np->rxopt.bits.rxoinfo = valbool;
253 retv = 0;
254 break;
255
256 case IPV6_RECVHOPLIMIT:
257 if (optlen < sizeof(int))
258 goto e_inval;
259 np->rxopt.bits.rxhlim = valbool;
260 retv = 0;
261 break;
262
263 case IPV6_2292HOPLIMIT:
264 if (optlen < sizeof(int))
265 goto e_inval;
266 np->rxopt.bits.rxohlim = valbool;
267 retv = 0;
268 break;
269
270 case IPV6_RECVRTHDR:
271 if (optlen < sizeof(int))
272 goto e_inval;
273 np->rxopt.bits.srcrt = valbool;
274 retv = 0;
275 break;
276
277 case IPV6_2292RTHDR:
278 if (optlen < sizeof(int))
279 goto e_inval;
280 np->rxopt.bits.osrcrt = valbool;
281 retv = 0;
282 break;
283
284 case IPV6_RECVHOPOPTS:
285 if (optlen < sizeof(int))
286 goto e_inval;
287 np->rxopt.bits.hopopts = valbool;
288 retv = 0;
289 break;
290
291 case IPV6_2292HOPOPTS:
292 if (optlen < sizeof(int))
293 goto e_inval;
294 np->rxopt.bits.ohopopts = valbool;
295 retv = 0;
296 break;
297
298 case IPV6_RECVDSTOPTS:
299 if (optlen < sizeof(int))
300 goto e_inval;
301 np->rxopt.bits.dstopts = valbool;
302 retv = 0;
303 break;
304
305 case IPV6_2292DSTOPTS:
306 if (optlen < sizeof(int))
307 goto e_inval;
308 np->rxopt.bits.odstopts = valbool;
309 retv = 0;
310 break;
311
312 case IPV6_TCLASS:
313 if (optlen < sizeof(int))
314 goto e_inval;
315 if (val < -1 || val > 0xff)
316 goto e_inval;
317 /* RFC 3542, 6.5: default traffic class of 0x0 */
318 if (val == -1)
319 val = 0;
320 np->tclass = val;
321 retv = 0;
322 break;
323
324 case IPV6_RECVTCLASS:
325 if (optlen < sizeof(int))
326 goto e_inval;
327 np->rxopt.bits.rxtclass = valbool;
328 retv = 0;
329 break;
330
331 case IPV6_FLOWINFO:
332 if (optlen < sizeof(int))
333 goto e_inval;
334 np->rxopt.bits.rxflow = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_RECVPATHMTU:
339 if (optlen < sizeof(int))
340 goto e_inval;
341 np->rxopt.bits.rxpmtu = valbool;
342 retv = 0;
343 break;
344
345 case IPV6_TRANSPARENT:
346 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
347 !ns_capable(net->user_ns, CAP_NET_RAW)) {
348 retv = -EPERM;
349 break;
350 }
351 if (optlen < sizeof(int))
352 goto e_inval;
353 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
354 inet_sk(sk)->transparent = valbool;
355 retv = 0;
356 break;
357
358 case IPV6_RECVORIGDSTADDR:
359 if (optlen < sizeof(int))
360 goto e_inval;
361 np->rxopt.bits.rxorigdstaddr = valbool;
362 retv = 0;
363 break;
364
365 case IPV6_HOPOPTS:
366 case IPV6_RTHDRDSTOPTS:
367 case IPV6_RTHDR:
368 case IPV6_DSTOPTS:
369 {
370 struct ipv6_txoptions *opt;
371
372 /* remove any sticky options header with a zero option
373 * length, per RFC3542.
374 */
375 if (optlen == 0)
376 optval = NULL;
377 else if (optval == NULL)
378 goto e_inval;
379 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
380 optlen & 0x7 || optlen > 8 * 255)
381 goto e_inval;
382
383 /* hop-by-hop / destination options are privileged option */
384 retv = -EPERM;
385 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
386 break;
387
388 opt = ipv6_renew_options(sk, np->opt, optname,
389 (struct ipv6_opt_hdr __user *)optval,
390 optlen);
391 if (IS_ERR(opt)) {
392 retv = PTR_ERR(opt);
393 break;
394 }
395
396 /* routing header option needs extra check */
397 retv = -EINVAL;
398 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
399 struct ipv6_rt_hdr *rthdr = opt->srcrt;
400 switch (rthdr->type) {
401#if IS_ENABLED(CONFIG_IPV6_MIP6)
402 case IPV6_SRCRT_TYPE_2:
403 if (rthdr->hdrlen != 2 ||
404 rthdr->segments_left != 1)
405 goto sticky_done;
406
407 break;
408#endif
409 default:
410 goto sticky_done;
411 }
412 }
413
414 retv = 0;
415 opt = ipv6_update_options(sk, opt);
416sticky_done:
417 if (opt)
418 sock_kfree_s(sk, opt, opt->tot_len);
419 break;
420 }
421
422 case IPV6_PKTINFO:
423 {
424 struct in6_pktinfo pkt;
425
426 if (optlen == 0)
427 goto e_inval;
428 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
429 goto e_inval;
430
431 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
432 retv = -EFAULT;
433 break;
434 }
435 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
436 goto e_inval;
437
438 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
439 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
440 retv = 0;
441 break;
442 }
443
444 case IPV6_2292PKTOPTIONS:
445 {
446 struct ipv6_txoptions *opt = NULL;
447 struct msghdr msg;
448 struct flowi6 fl6;
449 int junk;
450
451 memset(&fl6, 0, sizeof(fl6));
452 fl6.flowi6_oif = sk->sk_bound_dev_if;
453 fl6.flowi6_mark = sk->sk_mark;
454
455 if (optlen == 0)
456 goto update;
457
458 /* 1K is probably excessive
459 * 1K is surely not enough, 2K per standard header is 16K.
460 */
461 retv = -EINVAL;
462 if (optlen > 64*1024)
463 break;
464
465 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
466 retv = -ENOBUFS;
467 if (opt == NULL)
468 break;
469
470 memset(opt, 0, sizeof(*opt));
471 opt->tot_len = sizeof(*opt) + optlen;
472 retv = -EFAULT;
473 if (copy_from_user(opt+1, optval, optlen))
474 goto done;
475
476 msg.msg_controllen = optlen;
477 msg.msg_control = (void*)(opt+1);
478
479 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
480 &junk, &junk);
481 if (retv)
482 goto done;
483update:
484 retv = 0;
485 opt = ipv6_update_options(sk, opt);
486done:
487 if (opt)
488 sock_kfree_s(sk, opt, opt->tot_len);
489 break;
490 }
491 case IPV6_UNICAST_HOPS:
492 if (optlen < sizeof(int))
493 goto e_inval;
494 if (val > 255 || val < -1)
495 goto e_inval;
496 np->hop_limit = val;
497 retv = 0;
498 break;
499
500 case IPV6_MULTICAST_HOPS:
501 if (sk->sk_type == SOCK_STREAM)
502 break;
503 if (optlen < sizeof(int))
504 goto e_inval;
505 if (val > 255 || val < -1)
506 goto e_inval;
507 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
508 retv = 0;
509 break;
510
511 case IPV6_MULTICAST_LOOP:
512 if (optlen < sizeof(int))
513 goto e_inval;
514 if (val != valbool)
515 goto e_inval;
516 np->mc_loop = valbool;
517 retv = 0;
518 break;
519
520 case IPV6_UNICAST_IF:
521 {
522 struct net_device *dev = NULL;
523 int ifindex;
524
525 if (optlen != sizeof(int))
526 goto e_inval;
527
528 ifindex = (__force int)ntohl((__force __be32)val);
529 if (ifindex == 0) {
530 np->ucast_oif = 0;
531 retv = 0;
532 break;
533 }
534
535 dev = dev_get_by_index(net, ifindex);
536 retv = -EADDRNOTAVAIL;
537 if (!dev)
538 break;
539 dev_put(dev);
540
541 retv = -EINVAL;
542 if (sk->sk_bound_dev_if)
543 break;
544
545 np->ucast_oif = ifindex;
546 retv = 0;
547 break;
548 }
549
550 case IPV6_MULTICAST_IF:
551 if (sk->sk_type == SOCK_STREAM)
552 break;
553 if (optlen < sizeof(int))
554 goto e_inval;
555
556 if (val) {
557 struct net_device *dev;
558
559 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
560 goto e_inval;
561
562 dev = dev_get_by_index(net, val);
563 if (!dev) {
564 retv = -ENODEV;
565 break;
566 }
567 dev_put(dev);
568 }
569 np->mcast_oif = val;
570 retv = 0;
571 break;
572 case IPV6_ADD_MEMBERSHIP:
573 case IPV6_DROP_MEMBERSHIP:
574 {
575 struct ipv6_mreq mreq;
576
577 if (optlen < sizeof(struct ipv6_mreq))
578 goto e_inval;
579
580 retv = -EPROTO;
581 if (inet_sk(sk)->is_icsk)
582 break;
583
584 retv = -EFAULT;
585 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
586 break;
587
588 if (optname == IPV6_ADD_MEMBERSHIP)
589 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
590 else
591 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
592 break;
593 }
594 case IPV6_JOIN_ANYCAST:
595 case IPV6_LEAVE_ANYCAST:
596 {
597 struct ipv6_mreq mreq;
598
599 if (optlen < sizeof(struct ipv6_mreq))
600 goto e_inval;
601
602 retv = -EFAULT;
603 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
604 break;
605
606 if (optname == IPV6_JOIN_ANYCAST)
607 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
608 else
609 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
610 break;
611 }
612 case MCAST_JOIN_GROUP:
613 case MCAST_LEAVE_GROUP:
614 {
615 struct group_req greq;
616 struct sockaddr_in6 *psin6;
617
618 if (optlen < sizeof(struct group_req))
619 goto e_inval;
620
621 retv = -EFAULT;
622 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
623 break;
624 if (greq.gr_group.ss_family != AF_INET6) {
625 retv = -EADDRNOTAVAIL;
626 break;
627 }
628 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
629 if (optname == MCAST_JOIN_GROUP)
630 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
631 &psin6->sin6_addr);
632 else
633 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
634 &psin6->sin6_addr);
635 break;
636 }
637 case MCAST_JOIN_SOURCE_GROUP:
638 case MCAST_LEAVE_SOURCE_GROUP:
639 case MCAST_BLOCK_SOURCE:
640 case MCAST_UNBLOCK_SOURCE:
641 {
642 struct group_source_req greqs;
643 int omode, add;
644
645 if (optlen < sizeof(struct group_source_req))
646 goto e_inval;
647 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
648 retv = -EFAULT;
649 break;
650 }
651 if (greqs.gsr_group.ss_family != AF_INET6 ||
652 greqs.gsr_source.ss_family != AF_INET6) {
653 retv = -EADDRNOTAVAIL;
654 break;
655 }
656 if (optname == MCAST_BLOCK_SOURCE) {
657 omode = MCAST_EXCLUDE;
658 add = 1;
659 } else if (optname == MCAST_UNBLOCK_SOURCE) {
660 omode = MCAST_EXCLUDE;
661 add = 0;
662 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
663 struct sockaddr_in6 *psin6;
664
665 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
666 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
667 &psin6->sin6_addr);
668 /* prior join w/ different source is ok */
669 if (retv && retv != -EADDRINUSE)
670 break;
671 omode = MCAST_INCLUDE;
672 add = 1;
673 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
674 omode = MCAST_INCLUDE;
675 add = 0;
676 }
677 retv = ip6_mc_source(add, omode, sk, &greqs);
678 break;
679 }
680 case MCAST_MSFILTER:
681 {
682 struct group_filter *gsf;
683
684 if (optlen < GROUP_FILTER_SIZE(0))
685 goto e_inval;
686 if (optlen > sysctl_optmem_max) {
687 retv = -ENOBUFS;
688 break;
689 }
690 gsf = kmalloc(optlen,GFP_KERNEL);
691 if (!gsf) {
692 retv = -ENOBUFS;
693 break;
694 }
695 retv = -EFAULT;
696 if (copy_from_user(gsf, optval, optlen)) {
697 kfree(gsf);
698 break;
699 }
700 /* numsrc >= (4G-140)/128 overflow in 32 bits */
701 if (gsf->gf_numsrc >= 0x1ffffffU ||
702 gsf->gf_numsrc > sysctl_mld_max_msf) {
703 kfree(gsf);
704 retv = -ENOBUFS;
705 break;
706 }
707 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
708 kfree(gsf);
709 retv = -EINVAL;
710 break;
711 }
712 retv = ip6_mc_msfilter(sk, gsf);
713 kfree(gsf);
714
715 break;
716 }
717 case IPV6_ROUTER_ALERT:
718 if (optlen < sizeof(int))
719 goto e_inval;
720 retv = ip6_ra_control(sk, val);
721 break;
722 case IPV6_MTU_DISCOVER:
723 if (optlen < sizeof(int))
724 goto e_inval;
725 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
726 goto e_inval;
727 np->pmtudisc = val;
728 retv = 0;
729 break;
730 case IPV6_MTU:
731 if (optlen < sizeof(int))
732 goto e_inval;
733 if (val && val < IPV6_MIN_MTU)
734 goto e_inval;
735 np->frag_size = val;
736 retv = 0;
737 break;
738 case IPV6_RECVERR:
739 if (optlen < sizeof(int))
740 goto e_inval;
741 np->recverr = valbool;
742 if (!val)
743 skb_queue_purge(&sk->sk_error_queue);
744 retv = 0;
745 break;
746 case IPV6_FLOWINFO_SEND:
747 if (optlen < sizeof(int))
748 goto e_inval;
749 np->sndflow = valbool;
750 retv = 0;
751 break;
752 case IPV6_FLOWLABEL_MGR:
753 retv = ipv6_flowlabel_opt(sk, optval, optlen);
754 break;
755 case IPV6_IPSEC_POLICY:
756 case IPV6_XFRM_POLICY:
757 retv = -EPERM;
758 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
759 break;
760 retv = xfrm_user_policy(sk, optname, optval, optlen);
761 break;
762
763 case IPV6_ADDR_PREFERENCES:
764 {
765 unsigned int pref = 0;
766 unsigned int prefmask = ~0;
767
768 if (optlen < sizeof(int))
769 goto e_inval;
770
771 retv = -EINVAL;
772
773 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
774 switch (val & (IPV6_PREFER_SRC_PUBLIC|
775 IPV6_PREFER_SRC_TMP|
776 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
777 case IPV6_PREFER_SRC_PUBLIC:
778 pref |= IPV6_PREFER_SRC_PUBLIC;
779 break;
780 case IPV6_PREFER_SRC_TMP:
781 pref |= IPV6_PREFER_SRC_TMP;
782 break;
783 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
784 break;
785 case 0:
786 goto pref_skip_pubtmp;
787 default:
788 goto e_inval;
789 }
790
791 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
792 IPV6_PREFER_SRC_TMP);
793pref_skip_pubtmp:
794
795 /* check HOME/COA conflicts */
796 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
797 case IPV6_PREFER_SRC_HOME:
798 break;
799 case IPV6_PREFER_SRC_COA:
800 pref |= IPV6_PREFER_SRC_COA;
801 case 0:
802 goto pref_skip_coa;
803 default:
804 goto e_inval;
805 }
806
807 prefmask &= ~IPV6_PREFER_SRC_COA;
808pref_skip_coa:
809
810 /* check CGA/NONCGA conflicts */
811 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
812 case IPV6_PREFER_SRC_CGA:
813 case IPV6_PREFER_SRC_NONCGA:
814 case 0:
815 break;
816 default:
817 goto e_inval;
818 }
819
820 np->srcprefs = (np->srcprefs & prefmask) | pref;
821 retv = 0;
822
823 break;
824 }
825 case IPV6_MINHOPCOUNT:
826 if (optlen < sizeof(int))
827 goto e_inval;
828 if (val < 0 || val > 255)
829 goto e_inval;
830 np->min_hopcount = val;
831 retv = 0;
832 break;
833 case IPV6_DONTFRAG:
834 np->dontfrag = valbool;
835 retv = 0;
836 break;
837 }
838
839 release_sock(sk);
840
841 return retv;
842
843e_inval:
844 release_sock(sk);
845 return -EINVAL;
846}
847
848int ipv6_setsockopt(struct sock *sk, int level, int optname,
849 char __user *optval, unsigned int optlen)
850{
851 int err;
852
853 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
854 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855
856 if (level != SOL_IPV6)
857 return -ENOPROTOOPT;
858
859 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
860#ifdef CONFIG_NETFILTER
861 /* we need to exclude all possible ENOPROTOOPTs except default case */
862 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
863 optname != IPV6_XFRM_POLICY) {
864 lock_sock(sk);
865 err = nf_setsockopt(sk, PF_INET6, optname, optval,
866 optlen);
867 release_sock(sk);
868 }
869#endif
870 return err;
871}
872
873EXPORT_SYMBOL(ipv6_setsockopt);
874
875#ifdef CONFIG_COMPAT
876int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
877 char __user *optval, unsigned int optlen)
878{
879 int err;
880
881 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
882 if (udp_prot.compat_setsockopt != NULL)
883 return udp_prot.compat_setsockopt(sk, level, optname,
884 optval, optlen);
885 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
886 }
887
888 if (level != SOL_IPV6)
889 return -ENOPROTOOPT;
890
891 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
892 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
893 ipv6_setsockopt);
894
895 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896#ifdef CONFIG_NETFILTER
897 /* we need to exclude all possible ENOPROTOOPTs except default case */
898 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
899 optname != IPV6_XFRM_POLICY) {
900 lock_sock(sk);
901 err = compat_nf_setsockopt(sk, PF_INET6, optname,
902 optval, optlen);
903 release_sock(sk);
904 }
905#endif
906 return err;
907}
908
909EXPORT_SYMBOL(compat_ipv6_setsockopt);
910#endif
911
912static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
913 int optname, char __user *optval, int len)
914{
915 struct ipv6_opt_hdr *hdr;
916
917 if (!opt)
918 return 0;
919
920 switch(optname) {
921 case IPV6_HOPOPTS:
922 hdr = opt->hopopt;
923 break;
924 case IPV6_RTHDRDSTOPTS:
925 hdr = opt->dst0opt;
926 break;
927 case IPV6_RTHDR:
928 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
929 break;
930 case IPV6_DSTOPTS:
931 hdr = opt->dst1opt;
932 break;
933 default:
934 return -EINVAL; /* should not happen */
935 }
936
937 if (!hdr)
938 return 0;
939
940 len = min_t(unsigned int, len, ipv6_optlen(hdr));
941 if (copy_to_user(optval, hdr, len))
942 return -EFAULT;
943 return len;
944}
945
946static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
947 char __user *optval, int __user *optlen, unsigned int flags)
948{
949 struct ipv6_pinfo *np = inet6_sk(sk);
950 int len;
951 int val;
952
953 if (ip6_mroute_opt(optname))
954 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
955
956 if (get_user(len, optlen))
957 return -EFAULT;
958 switch (optname) {
959 case IPV6_ADDRFORM:
960 if (sk->sk_protocol != IPPROTO_UDP &&
961 sk->sk_protocol != IPPROTO_UDPLITE &&
962 sk->sk_protocol != IPPROTO_TCP)
963 return -ENOPROTOOPT;
964 if (sk->sk_state != TCP_ESTABLISHED)
965 return -ENOTCONN;
966 val = sk->sk_family;
967 break;
968 case MCAST_MSFILTER:
969 {
970 struct group_filter gsf;
971 int err;
972
973 if (len < GROUP_FILTER_SIZE(0))
974 return -EINVAL;
975 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
976 return -EFAULT;
977 if (gsf.gf_group.ss_family != AF_INET6)
978 return -EADDRNOTAVAIL;
979 lock_sock(sk);
980 err = ip6_mc_msfget(sk, &gsf,
981 (struct group_filter __user *)optval, optlen);
982 release_sock(sk);
983 return err;
984 }
985
986 case IPV6_2292PKTOPTIONS:
987 {
988 struct msghdr msg;
989 struct sk_buff *skb;
990
991 if (sk->sk_type != SOCK_STREAM)
992 return -ENOPROTOOPT;
993
994 msg.msg_control = optval;
995 msg.msg_controllen = len;
996 msg.msg_flags = flags;
997
998 lock_sock(sk);
999 skb = np->pktoptions;
1000 if (skb)
1001 atomic_inc(&skb->users);
1002 release_sock(sk);
1003
1004 if (skb) {
1005 ip6_datagram_recv_ctl(sk, &msg, skb);
1006 kfree_skb(skb);
1007 } else {
1008 if (np->rxopt.bits.rxinfo) {
1009 struct in6_pktinfo src_info;
1010 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1011 np->sticky_pktinfo.ipi6_ifindex;
1012 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1013 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1014 }
1015 if (np->rxopt.bits.rxhlim) {
1016 int hlim = np->mcast_hops;
1017 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1018 }
1019 if (np->rxopt.bits.rxtclass) {
1020 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1021
1022 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1023 }
1024 if (np->rxopt.bits.rxoinfo) {
1025 struct in6_pktinfo src_info;
1026 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1027 np->sticky_pktinfo.ipi6_ifindex;
1028 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1029 np->sticky_pktinfo.ipi6_addr;
1030 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1031 }
1032 if (np->rxopt.bits.rxohlim) {
1033 int hlim = np->mcast_hops;
1034 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1035 }
1036 if (np->rxopt.bits.rxflow) {
1037 __be32 flowinfo = np->rcv_flowinfo;
1038
1039 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1040 }
1041 }
1042 len -= msg.msg_controllen;
1043 return put_user(len, optlen);
1044 }
1045 case IPV6_MTU:
1046 {
1047 struct dst_entry *dst;
1048
1049 val = 0;
1050 rcu_read_lock();
1051 dst = __sk_dst_get(sk);
1052 if (dst)
1053 val = dst_mtu(dst);
1054 rcu_read_unlock();
1055 if (!val)
1056 return -ENOTCONN;
1057 break;
1058 }
1059
1060 case IPV6_V6ONLY:
1061 val = np->ipv6only;
1062 break;
1063
1064 case IPV6_RECVPKTINFO:
1065 val = np->rxopt.bits.rxinfo;
1066 break;
1067
1068 case IPV6_2292PKTINFO:
1069 val = np->rxopt.bits.rxoinfo;
1070 break;
1071
1072 case IPV6_RECVHOPLIMIT:
1073 val = np->rxopt.bits.rxhlim;
1074 break;
1075
1076 case IPV6_2292HOPLIMIT:
1077 val = np->rxopt.bits.rxohlim;
1078 break;
1079
1080 case IPV6_RECVRTHDR:
1081 val = np->rxopt.bits.srcrt;
1082 break;
1083
1084 case IPV6_2292RTHDR:
1085 val = np->rxopt.bits.osrcrt;
1086 break;
1087
1088 case IPV6_HOPOPTS:
1089 case IPV6_RTHDRDSTOPTS:
1090 case IPV6_RTHDR:
1091 case IPV6_DSTOPTS:
1092 {
1093
1094 lock_sock(sk);
1095 len = ipv6_getsockopt_sticky(sk, np->opt,
1096 optname, optval, len);
1097 release_sock(sk);
1098 /* check if ipv6_getsockopt_sticky() returns err code */
1099 if (len < 0)
1100 return len;
1101 return put_user(len, optlen);
1102 }
1103
1104 case IPV6_RECVHOPOPTS:
1105 val = np->rxopt.bits.hopopts;
1106 break;
1107
1108 case IPV6_2292HOPOPTS:
1109 val = np->rxopt.bits.ohopopts;
1110 break;
1111
1112 case IPV6_RECVDSTOPTS:
1113 val = np->rxopt.bits.dstopts;
1114 break;
1115
1116 case IPV6_2292DSTOPTS:
1117 val = np->rxopt.bits.odstopts;
1118 break;
1119
1120 case IPV6_TCLASS:
1121 val = np->tclass;
1122 break;
1123
1124 case IPV6_RECVTCLASS:
1125 val = np->rxopt.bits.rxtclass;
1126 break;
1127
1128 case IPV6_FLOWINFO:
1129 val = np->rxopt.bits.rxflow;
1130 break;
1131
1132 case IPV6_RECVPATHMTU:
1133 val = np->rxopt.bits.rxpmtu;
1134 break;
1135
1136 case IPV6_PATHMTU:
1137 {
1138 struct dst_entry *dst;
1139 struct ip6_mtuinfo mtuinfo;
1140
1141 if (len < sizeof(mtuinfo))
1142 return -EINVAL;
1143
1144 len = sizeof(mtuinfo);
1145 memset(&mtuinfo, 0, sizeof(mtuinfo));
1146
1147 rcu_read_lock();
1148 dst = __sk_dst_get(sk);
1149 if (dst)
1150 mtuinfo.ip6m_mtu = dst_mtu(dst);
1151 rcu_read_unlock();
1152 if (!mtuinfo.ip6m_mtu)
1153 return -ENOTCONN;
1154
1155 if (put_user(len, optlen))
1156 return -EFAULT;
1157 if (copy_to_user(optval, &mtuinfo, len))
1158 return -EFAULT;
1159
1160 return 0;
1161 break;
1162 }
1163
1164 case IPV6_TRANSPARENT:
1165 val = inet_sk(sk)->transparent;
1166 break;
1167
1168 case IPV6_RECVORIGDSTADDR:
1169 val = np->rxopt.bits.rxorigdstaddr;
1170 break;
1171
1172 case IPV6_UNICAST_HOPS:
1173 case IPV6_MULTICAST_HOPS:
1174 {
1175 struct dst_entry *dst;
1176
1177 if (optname == IPV6_UNICAST_HOPS)
1178 val = np->hop_limit;
1179 else
1180 val = np->mcast_hops;
1181
1182 if (val < 0) {
1183 rcu_read_lock();
1184 dst = __sk_dst_get(sk);
1185 if (dst)
1186 val = ip6_dst_hoplimit(dst);
1187 rcu_read_unlock();
1188 }
1189
1190 if (val < 0)
1191 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1192 break;
1193 }
1194
1195 case IPV6_MULTICAST_LOOP:
1196 val = np->mc_loop;
1197 break;
1198
1199 case IPV6_MULTICAST_IF:
1200 val = np->mcast_oif;
1201 break;
1202
1203 case IPV6_UNICAST_IF:
1204 val = (__force int)htonl((__u32) np->ucast_oif);
1205 break;
1206
1207 case IPV6_MTU_DISCOVER:
1208 val = np->pmtudisc;
1209 break;
1210
1211 case IPV6_RECVERR:
1212 val = np->recverr;
1213 break;
1214
1215 case IPV6_FLOWINFO_SEND:
1216 val = np->sndflow;
1217 break;
1218
1219 case IPV6_FLOWLABEL_MGR:
1220 {
1221 struct in6_flowlabel_req freq;
1222 int flags;
1223
1224 if (len < sizeof(freq))
1225 return -EINVAL;
1226
1227 if (copy_from_user(&freq, optval, sizeof(freq)))
1228 return -EFAULT;
1229
1230 if (freq.flr_action != IPV6_FL_A_GET)
1231 return -EINVAL;
1232
1233 len = sizeof(freq);
1234 flags = freq.flr_flags;
1235
1236 memset(&freq, 0, sizeof(freq));
1237
1238 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1239 if (val < 0)
1240 return val;
1241
1242 if (put_user(len, optlen))
1243 return -EFAULT;
1244 if (copy_to_user(optval, &freq, len))
1245 return -EFAULT;
1246
1247 return 0;
1248 }
1249
1250 case IPV6_ADDR_PREFERENCES:
1251 val = 0;
1252
1253 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1254 val |= IPV6_PREFER_SRC_TMP;
1255 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1256 val |= IPV6_PREFER_SRC_PUBLIC;
1257 else {
1258 /* XXX: should we return system default? */
1259 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1260 }
1261
1262 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1263 val |= IPV6_PREFER_SRC_COA;
1264 else
1265 val |= IPV6_PREFER_SRC_HOME;
1266 break;
1267
1268 case IPV6_MINHOPCOUNT:
1269 val = np->min_hopcount;
1270 break;
1271
1272 case IPV6_DONTFRAG:
1273 val = np->dontfrag;
1274 break;
1275
1276 default:
1277 return -ENOPROTOOPT;
1278 }
1279 len = min_t(unsigned int, sizeof(int), len);
1280 if(put_user(len, optlen))
1281 return -EFAULT;
1282 if(copy_to_user(optval,&val,len))
1283 return -EFAULT;
1284 return 0;
1285}
1286
1287int ipv6_getsockopt(struct sock *sk, int level, int optname,
1288 char __user *optval, int __user *optlen)
1289{
1290 int err;
1291
1292 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1293 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1294
1295 if(level != SOL_IPV6)
1296 return -ENOPROTOOPT;
1297
1298 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1299#ifdef CONFIG_NETFILTER
1300 /* we need to exclude all possible ENOPROTOOPTs except default case */
1301 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1302 int len;
1303
1304 if (get_user(len, optlen))
1305 return -EFAULT;
1306
1307 lock_sock(sk);
1308 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1309 &len);
1310 release_sock(sk);
1311 if (err >= 0)
1312 err = put_user(len, optlen);
1313 }
1314#endif
1315 return err;
1316}
1317
1318EXPORT_SYMBOL(ipv6_getsockopt);
1319
1320#ifdef CONFIG_COMPAT
1321int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1322 char __user *optval, int __user *optlen)
1323{
1324 int err;
1325
1326 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1327 if (udp_prot.compat_getsockopt != NULL)
1328 return udp_prot.compat_getsockopt(sk, level, optname,
1329 optval, optlen);
1330 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1331 }
1332
1333 if (level != SOL_IPV6)
1334 return -ENOPROTOOPT;
1335
1336 if (optname == MCAST_MSFILTER)
1337 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1338 ipv6_getsockopt);
1339
1340 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1341 MSG_CMSG_COMPAT);
1342#ifdef CONFIG_NETFILTER
1343 /* we need to exclude all possible ENOPROTOOPTs except default case */
1344 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1345 int len;
1346
1347 if (get_user(len, optlen))
1348 return -EFAULT;
1349
1350 lock_sock(sk);
1351 err = compat_nf_getsockopt(sk, PF_INET6,
1352 optname, optval, &len);
1353 release_sock(sk);
1354 if (err >= 0)
1355 err = put_user(len, optlen);
1356 }
1357#endif
1358 return err;
1359}
1360
1361EXPORT_SYMBOL(compat_ipv6_getsockopt);
1362#endif
1363
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21#include <linux/module.h>
22#include <linux/capability.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/mroute6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/init.h>
33#include <linux/sysctl.h>
34#include <linux/netfilter.h>
35#include <linux/slab.h>
36
37#include <net/sock.h>
38#include <net/snmp.h>
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
44#include <net/addrconf.h>
45#include <net/inet_common.h>
46#include <net/tcp.h>
47#include <net/udp.h>
48#include <net/udplite.h>
49#include <net/xfrm.h>
50#include <net/compat.h>
51#include <net/seg6.h>
52
53#include <linux/uaccess.h>
54
55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
58int ip6_ra_control(struct sock *sk, int sel)
59{
60 struct ip6_ra_chain *ra, *new_ra, **rap;
61
62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
64 return -ENOPROTOOPT;
65
66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67 if (sel >= 0 && !new_ra)
68 return -ENOMEM;
69
70 write_lock_bh(&ip6_ra_lock);
71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
72 if (ra->sk == sk) {
73 if (sel >= 0) {
74 write_unlock_bh(&ip6_ra_lock);
75 kfree(new_ra);
76 return -EADDRINUSE;
77 }
78
79 *rap = ra->next;
80 write_unlock_bh(&ip6_ra_lock);
81
82 sock_put(sk);
83 kfree(ra);
84 return 0;
85 }
86 }
87 if (!new_ra) {
88 write_unlock_bh(&ip6_ra_lock);
89 return -ENOBUFS;
90 }
91 new_ra->sk = sk;
92 new_ra->sel = sel;
93 new_ra->next = ra;
94 *rap = new_ra;
95 sock_hold(sk);
96 write_unlock_bh(&ip6_ra_lock);
97 return 0;
98}
99
100struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101 struct ipv6_txoptions *opt)
102{
103 if (inet_sk(sk)->is_icsk) {
104 if (opt &&
105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107 struct inet_connection_sock *icsk = inet_csk(sk);
108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
110 }
111 }
112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
113 opt);
114 sk_dst_reset(sk);
115
116 return opt;
117}
118
119static bool setsockopt_needs_rtnl(int optname)
120{
121 switch (optname) {
122 case IPV6_ADDRFORM:
123 case IPV6_ADD_MEMBERSHIP:
124 case IPV6_DROP_MEMBERSHIP:
125 case IPV6_JOIN_ANYCAST:
126 case IPV6_LEAVE_ANYCAST:
127 case MCAST_JOIN_GROUP:
128 case MCAST_LEAVE_GROUP:
129 case MCAST_JOIN_SOURCE_GROUP:
130 case MCAST_LEAVE_SOURCE_GROUP:
131 case MCAST_BLOCK_SOURCE:
132 case MCAST_UNBLOCK_SOURCE:
133 case MCAST_MSFILTER:
134 return true;
135 }
136 return false;
137}
138
139static int copy_group_source_from_sockptr(struct group_source_req *greqs,
140 sockptr_t optval, int optlen)
141{
142 if (in_compat_syscall()) {
143 struct compat_group_source_req gr32;
144
145 if (optlen < sizeof(gr32))
146 return -EINVAL;
147 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
148 return -EFAULT;
149 greqs->gsr_interface = gr32.gsr_interface;
150 greqs->gsr_group = gr32.gsr_group;
151 greqs->gsr_source = gr32.gsr_source;
152 } else {
153 if (optlen < sizeof(*greqs))
154 return -EINVAL;
155 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
156 return -EFAULT;
157 }
158
159 return 0;
160}
161
162static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
163 sockptr_t optval, int optlen)
164{
165 struct group_source_req greqs;
166 int omode, add;
167 int ret;
168
169 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
170 if (ret)
171 return ret;
172
173 if (greqs.gsr_group.ss_family != AF_INET6 ||
174 greqs.gsr_source.ss_family != AF_INET6)
175 return -EADDRNOTAVAIL;
176
177 if (optname == MCAST_BLOCK_SOURCE) {
178 omode = MCAST_EXCLUDE;
179 add = 1;
180 } else if (optname == MCAST_UNBLOCK_SOURCE) {
181 omode = MCAST_EXCLUDE;
182 add = 0;
183 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
184 struct sockaddr_in6 *psin6;
185 int retv;
186
187 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
188 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
189 &psin6->sin6_addr,
190 MCAST_INCLUDE);
191 /* prior join w/ different source is ok */
192 if (retv && retv != -EADDRINUSE)
193 return retv;
194 omode = MCAST_INCLUDE;
195 add = 1;
196 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
197 omode = MCAST_INCLUDE;
198 add = 0;
199 }
200 return ip6_mc_source(add, omode, sk, &greqs);
201}
202
203static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
204 int optlen)
205{
206 struct group_filter *gsf;
207 int ret;
208
209 if (optlen < GROUP_FILTER_SIZE(0))
210 return -EINVAL;
211 if (optlen > sysctl_optmem_max)
212 return -ENOBUFS;
213
214 gsf = memdup_sockptr(optval, optlen);
215 if (IS_ERR(gsf))
216 return PTR_ERR(gsf);
217
218 /* numsrc >= (4G-140)/128 overflow in 32 bits */
219 ret = -ENOBUFS;
220 if (gsf->gf_numsrc >= 0x1ffffffU ||
221 gsf->gf_numsrc > sysctl_mld_max_msf)
222 goto out_free_gsf;
223
224 ret = -EINVAL;
225 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
226 goto out_free_gsf;
227
228 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
229out_free_gsf:
230 kfree(gsf);
231 return ret;
232}
233
234static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
235 int optlen)
236{
237 const int size0 = offsetof(struct compat_group_filter, gf_slist);
238 struct compat_group_filter *gf32;
239 void *p;
240 int ret;
241 int n;
242
243 if (optlen < size0)
244 return -EINVAL;
245 if (optlen > sysctl_optmem_max - 4)
246 return -ENOBUFS;
247
248 p = kmalloc(optlen + 4, GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
253 ret = -EFAULT;
254 if (copy_from_sockptr(gf32, optval, optlen))
255 goto out_free_p;
256
257 /* numsrc >= (4G-140)/128 overflow in 32 bits */
258 ret = -ENOBUFS;
259 n = gf32->gf_numsrc;
260 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
261 goto out_free_p;
262
263 ret = -EINVAL;
264 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen)
265 goto out_free_p;
266
267 ret = ip6_mc_msfilter(sk, &(struct group_filter){
268 .gf_interface = gf32->gf_interface,
269 .gf_group = gf32->gf_group,
270 .gf_fmode = gf32->gf_fmode,
271 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
272
273out_free_p:
274 kfree(p);
275 return ret;
276}
277
278static int ipv6_mcast_join_leave(struct sock *sk, int optname,
279 sockptr_t optval, int optlen)
280{
281 struct sockaddr_in6 *psin6;
282 struct group_req greq;
283
284 if (optlen < sizeof(greq))
285 return -EINVAL;
286 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
287 return -EFAULT;
288
289 if (greq.gr_group.ss_family != AF_INET6)
290 return -EADDRNOTAVAIL;
291 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
292 if (optname == MCAST_JOIN_GROUP)
293 return ipv6_sock_mc_join(sk, greq.gr_interface,
294 &psin6->sin6_addr);
295 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
296}
297
298static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
299 sockptr_t optval, int optlen)
300{
301 struct compat_group_req gr32;
302 struct sockaddr_in6 *psin6;
303
304 if (optlen < sizeof(gr32))
305 return -EINVAL;
306 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
307 return -EFAULT;
308
309 if (gr32.gr_group.ss_family != AF_INET6)
310 return -EADDRNOTAVAIL;
311 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
312 if (optname == MCAST_JOIN_GROUP)
313 return ipv6_sock_mc_join(sk, gr32.gr_interface,
314 &psin6->sin6_addr);
315 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
316}
317
318static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
319 int optlen)
320{
321 struct ipv6_pinfo *np = inet6_sk(sk);
322 struct ipv6_opt_hdr *new = NULL;
323 struct net *net = sock_net(sk);
324 struct ipv6_txoptions *opt;
325 int err;
326
327 /* hop-by-hop / destination options are privileged option */
328 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
329 return -EPERM;
330
331 /* remove any sticky options header with a zero option
332 * length, per RFC3542.
333 */
334 if (optlen > 0) {
335 if (sockptr_is_null(optval))
336 return -EINVAL;
337 if (optlen < sizeof(struct ipv6_opt_hdr) ||
338 optlen & 0x7 ||
339 optlen > 8 * 255)
340 return -EINVAL;
341
342 new = memdup_sockptr(optval, optlen);
343 if (IS_ERR(new))
344 return PTR_ERR(new);
345 if (unlikely(ipv6_optlen(new) > optlen)) {
346 kfree(new);
347 return -EINVAL;
348 }
349 }
350
351 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
352 opt = ipv6_renew_options(sk, opt, optname, new);
353 kfree(new);
354 if (IS_ERR(opt))
355 return PTR_ERR(opt);
356
357 /* routing header option needs extra check */
358 err = -EINVAL;
359 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
360 struct ipv6_rt_hdr *rthdr = opt->srcrt;
361 switch (rthdr->type) {
362#if IS_ENABLED(CONFIG_IPV6_MIP6)
363 case IPV6_SRCRT_TYPE_2:
364 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
365 goto sticky_done;
366 break;
367#endif
368 case IPV6_SRCRT_TYPE_4:
369 {
370 struct ipv6_sr_hdr *srh =
371 (struct ipv6_sr_hdr *)opt->srcrt;
372
373 if (!seg6_validate_srh(srh, optlen, false))
374 goto sticky_done;
375 break;
376 }
377 default:
378 goto sticky_done;
379 }
380 }
381
382 err = 0;
383 opt = ipv6_update_options(sk, opt);
384sticky_done:
385 if (opt) {
386 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
387 txopt_put(opt);
388 }
389 return err;
390}
391
392static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
393 sockptr_t optval, unsigned int optlen)
394{
395 struct ipv6_pinfo *np = inet6_sk(sk);
396 struct net *net = sock_net(sk);
397 int val, valbool;
398 int retv = -ENOPROTOOPT;
399 bool needs_rtnl = setsockopt_needs_rtnl(optname);
400
401 if (sockptr_is_null(optval))
402 val = 0;
403 else {
404 if (optlen >= sizeof(int)) {
405 if (copy_from_sockptr(&val, optval, sizeof(val)))
406 return -EFAULT;
407 } else
408 val = 0;
409 }
410
411 valbool = (val != 0);
412
413 if (ip6_mroute_opt(optname))
414 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
415
416 if (needs_rtnl)
417 rtnl_lock();
418 lock_sock(sk);
419
420 switch (optname) {
421
422 case IPV6_ADDRFORM:
423 if (optlen < sizeof(int))
424 goto e_inval;
425 if (val == PF_INET) {
426 struct ipv6_txoptions *opt;
427 struct sk_buff *pktopt;
428
429 if (sk->sk_type == SOCK_RAW)
430 break;
431
432 if (sk->sk_protocol == IPPROTO_UDP ||
433 sk->sk_protocol == IPPROTO_UDPLITE) {
434 struct udp_sock *up = udp_sk(sk);
435 if (up->pending == AF_INET6) {
436 retv = -EBUSY;
437 break;
438 }
439 } else if (sk->sk_protocol == IPPROTO_TCP) {
440 if (sk->sk_prot != &tcpv6_prot) {
441 retv = -EBUSY;
442 break;
443 }
444 } else {
445 break;
446 }
447
448 if (sk->sk_state != TCP_ESTABLISHED) {
449 retv = -ENOTCONN;
450 break;
451 }
452
453 if (ipv6_only_sock(sk) ||
454 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
455 retv = -EADDRNOTAVAIL;
456 break;
457 }
458
459 fl6_free_socklist(sk);
460 __ipv6_sock_mc_close(sk);
461 __ipv6_sock_ac_close(sk);
462
463 /*
464 * Sock is moving from IPv6 to IPv4 (sk_prot), so
465 * remove it from the refcnt debug socks count in the
466 * original family...
467 */
468 sk_refcnt_debug_dec(sk);
469
470 if (sk->sk_protocol == IPPROTO_TCP) {
471 struct inet_connection_sock *icsk = inet_csk(sk);
472 local_bh_disable();
473 sock_prot_inuse_add(net, sk->sk_prot, -1);
474 sock_prot_inuse_add(net, &tcp_prot, 1);
475 local_bh_enable();
476 sk->sk_prot = &tcp_prot;
477 icsk->icsk_af_ops = &ipv4_specific;
478 sk->sk_socket->ops = &inet_stream_ops;
479 sk->sk_family = PF_INET;
480 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
481 } else {
482 struct proto *prot = &udp_prot;
483
484 if (sk->sk_protocol == IPPROTO_UDPLITE)
485 prot = &udplite_prot;
486 local_bh_disable();
487 sock_prot_inuse_add(net, sk->sk_prot, -1);
488 sock_prot_inuse_add(net, prot, 1);
489 local_bh_enable();
490 sk->sk_prot = prot;
491 sk->sk_socket->ops = &inet_dgram_ops;
492 sk->sk_family = PF_INET;
493 }
494 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
495 NULL);
496 if (opt) {
497 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
498 txopt_put(opt);
499 }
500 pktopt = xchg(&np->pktoptions, NULL);
501 kfree_skb(pktopt);
502
503 /*
504 * ... and add it to the refcnt debug socks count
505 * in the new family. -acme
506 */
507 sk_refcnt_debug_inc(sk);
508 module_put(THIS_MODULE);
509 retv = 0;
510 break;
511 }
512 goto e_inval;
513
514 case IPV6_V6ONLY:
515 if (optlen < sizeof(int) ||
516 inet_sk(sk)->inet_num)
517 goto e_inval;
518 sk->sk_ipv6only = valbool;
519 retv = 0;
520 break;
521
522 case IPV6_RECVPKTINFO:
523 if (optlen < sizeof(int))
524 goto e_inval;
525 np->rxopt.bits.rxinfo = valbool;
526 retv = 0;
527 break;
528
529 case IPV6_2292PKTINFO:
530 if (optlen < sizeof(int))
531 goto e_inval;
532 np->rxopt.bits.rxoinfo = valbool;
533 retv = 0;
534 break;
535
536 case IPV6_RECVHOPLIMIT:
537 if (optlen < sizeof(int))
538 goto e_inval;
539 np->rxopt.bits.rxhlim = valbool;
540 retv = 0;
541 break;
542
543 case IPV6_2292HOPLIMIT:
544 if (optlen < sizeof(int))
545 goto e_inval;
546 np->rxopt.bits.rxohlim = valbool;
547 retv = 0;
548 break;
549
550 case IPV6_RECVRTHDR:
551 if (optlen < sizeof(int))
552 goto e_inval;
553 np->rxopt.bits.srcrt = valbool;
554 retv = 0;
555 break;
556
557 case IPV6_2292RTHDR:
558 if (optlen < sizeof(int))
559 goto e_inval;
560 np->rxopt.bits.osrcrt = valbool;
561 retv = 0;
562 break;
563
564 case IPV6_RECVHOPOPTS:
565 if (optlen < sizeof(int))
566 goto e_inval;
567 np->rxopt.bits.hopopts = valbool;
568 retv = 0;
569 break;
570
571 case IPV6_2292HOPOPTS:
572 if (optlen < sizeof(int))
573 goto e_inval;
574 np->rxopt.bits.ohopopts = valbool;
575 retv = 0;
576 break;
577
578 case IPV6_RECVDSTOPTS:
579 if (optlen < sizeof(int))
580 goto e_inval;
581 np->rxopt.bits.dstopts = valbool;
582 retv = 0;
583 break;
584
585 case IPV6_2292DSTOPTS:
586 if (optlen < sizeof(int))
587 goto e_inval;
588 np->rxopt.bits.odstopts = valbool;
589 retv = 0;
590 break;
591
592 case IPV6_TCLASS:
593 if (optlen < sizeof(int))
594 goto e_inval;
595 if (val < -1 || val > 0xff)
596 goto e_inval;
597 /* RFC 3542, 6.5: default traffic class of 0x0 */
598 if (val == -1)
599 val = 0;
600 np->tclass = val;
601 retv = 0;
602 break;
603
604 case IPV6_RECVTCLASS:
605 if (optlen < sizeof(int))
606 goto e_inval;
607 np->rxopt.bits.rxtclass = valbool;
608 retv = 0;
609 break;
610
611 case IPV6_FLOWINFO:
612 if (optlen < sizeof(int))
613 goto e_inval;
614 np->rxopt.bits.rxflow = valbool;
615 retv = 0;
616 break;
617
618 case IPV6_RECVPATHMTU:
619 if (optlen < sizeof(int))
620 goto e_inval;
621 np->rxopt.bits.rxpmtu = valbool;
622 retv = 0;
623 break;
624
625 case IPV6_TRANSPARENT:
626 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
627 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
628 retv = -EPERM;
629 break;
630 }
631 if (optlen < sizeof(int))
632 goto e_inval;
633 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
634 inet_sk(sk)->transparent = valbool;
635 retv = 0;
636 break;
637
638 case IPV6_FREEBIND:
639 if (optlen < sizeof(int))
640 goto e_inval;
641 /* we also don't have a separate freebind bit for IPV6 */
642 inet_sk(sk)->freebind = valbool;
643 retv = 0;
644 break;
645
646 case IPV6_RECVORIGDSTADDR:
647 if (optlen < sizeof(int))
648 goto e_inval;
649 np->rxopt.bits.rxorigdstaddr = valbool;
650 retv = 0;
651 break;
652
653 case IPV6_HOPOPTS:
654 case IPV6_RTHDRDSTOPTS:
655 case IPV6_RTHDR:
656 case IPV6_DSTOPTS:
657 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
658 break;
659
660 case IPV6_PKTINFO:
661 {
662 struct in6_pktinfo pkt;
663
664 if (optlen == 0)
665 goto e_inval;
666 else if (optlen < sizeof(struct in6_pktinfo) ||
667 sockptr_is_null(optval))
668 goto e_inval;
669
670 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
671 retv = -EFAULT;
672 break;
673 }
674 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
675 goto e_inval;
676
677 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
678 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
679 retv = 0;
680 break;
681 }
682
683 case IPV6_2292PKTOPTIONS:
684 {
685 struct ipv6_txoptions *opt = NULL;
686 struct msghdr msg;
687 struct flowi6 fl6;
688 struct ipcm6_cookie ipc6;
689
690 memset(&fl6, 0, sizeof(fl6));
691 fl6.flowi6_oif = sk->sk_bound_dev_if;
692 fl6.flowi6_mark = sk->sk_mark;
693
694 if (optlen == 0)
695 goto update;
696
697 /* 1K is probably excessive
698 * 1K is surely not enough, 2K per standard header is 16K.
699 */
700 retv = -EINVAL;
701 if (optlen > 64*1024)
702 break;
703
704 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
705 retv = -ENOBUFS;
706 if (!opt)
707 break;
708
709 memset(opt, 0, sizeof(*opt));
710 refcount_set(&opt->refcnt, 1);
711 opt->tot_len = sizeof(*opt) + optlen;
712 retv = -EFAULT;
713 if (copy_from_sockptr(opt + 1, optval, optlen))
714 goto done;
715
716 msg.msg_controllen = optlen;
717 msg.msg_control = (void *)(opt+1);
718 ipc6.opt = opt;
719
720 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
721 if (retv)
722 goto done;
723update:
724 retv = 0;
725 opt = ipv6_update_options(sk, opt);
726done:
727 if (opt) {
728 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
729 txopt_put(opt);
730 }
731 break;
732 }
733 case IPV6_UNICAST_HOPS:
734 if (optlen < sizeof(int))
735 goto e_inval;
736 if (val > 255 || val < -1)
737 goto e_inval;
738 np->hop_limit = val;
739 retv = 0;
740 break;
741
742 case IPV6_MULTICAST_HOPS:
743 if (sk->sk_type == SOCK_STREAM)
744 break;
745 if (optlen < sizeof(int))
746 goto e_inval;
747 if (val > 255 || val < -1)
748 goto e_inval;
749 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
750 retv = 0;
751 break;
752
753 case IPV6_MULTICAST_LOOP:
754 if (optlen < sizeof(int))
755 goto e_inval;
756 if (val != valbool)
757 goto e_inval;
758 np->mc_loop = valbool;
759 retv = 0;
760 break;
761
762 case IPV6_UNICAST_IF:
763 {
764 struct net_device *dev = NULL;
765 int ifindex;
766
767 if (optlen != sizeof(int))
768 goto e_inval;
769
770 ifindex = (__force int)ntohl((__force __be32)val);
771 if (ifindex == 0) {
772 np->ucast_oif = 0;
773 retv = 0;
774 break;
775 }
776
777 dev = dev_get_by_index(net, ifindex);
778 retv = -EADDRNOTAVAIL;
779 if (!dev)
780 break;
781 dev_put(dev);
782
783 retv = -EINVAL;
784 if (sk->sk_bound_dev_if)
785 break;
786
787 np->ucast_oif = ifindex;
788 retv = 0;
789 break;
790 }
791
792 case IPV6_MULTICAST_IF:
793 if (sk->sk_type == SOCK_STREAM)
794 break;
795 if (optlen < sizeof(int))
796 goto e_inval;
797
798 if (val) {
799 struct net_device *dev;
800 int midx;
801
802 rcu_read_lock();
803
804 dev = dev_get_by_index_rcu(net, val);
805 if (!dev) {
806 rcu_read_unlock();
807 retv = -ENODEV;
808 break;
809 }
810 midx = l3mdev_master_ifindex_rcu(dev);
811
812 rcu_read_unlock();
813
814 if (sk->sk_bound_dev_if &&
815 sk->sk_bound_dev_if != val &&
816 (!midx || midx != sk->sk_bound_dev_if))
817 goto e_inval;
818 }
819 np->mcast_oif = val;
820 retv = 0;
821 break;
822 case IPV6_ADD_MEMBERSHIP:
823 case IPV6_DROP_MEMBERSHIP:
824 {
825 struct ipv6_mreq mreq;
826
827 if (optlen < sizeof(struct ipv6_mreq))
828 goto e_inval;
829
830 retv = -EPROTO;
831 if (inet_sk(sk)->is_icsk)
832 break;
833
834 retv = -EFAULT;
835 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
836 break;
837
838 if (optname == IPV6_ADD_MEMBERSHIP)
839 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
840 else
841 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
842 break;
843 }
844 case IPV6_JOIN_ANYCAST:
845 case IPV6_LEAVE_ANYCAST:
846 {
847 struct ipv6_mreq mreq;
848
849 if (optlen < sizeof(struct ipv6_mreq))
850 goto e_inval;
851
852 retv = -EFAULT;
853 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
854 break;
855
856 if (optname == IPV6_JOIN_ANYCAST)
857 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
858 else
859 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
860 break;
861 }
862 case IPV6_MULTICAST_ALL:
863 if (optlen < sizeof(int))
864 goto e_inval;
865 np->mc_all = valbool;
866 retv = 0;
867 break;
868
869 case MCAST_JOIN_GROUP:
870 case MCAST_LEAVE_GROUP:
871 if (in_compat_syscall())
872 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
873 optlen);
874 else
875 retv = ipv6_mcast_join_leave(sk, optname, optval,
876 optlen);
877 break;
878 case MCAST_JOIN_SOURCE_GROUP:
879 case MCAST_LEAVE_SOURCE_GROUP:
880 case MCAST_BLOCK_SOURCE:
881 case MCAST_UNBLOCK_SOURCE:
882 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
883 break;
884 case MCAST_MSFILTER:
885 if (in_compat_syscall())
886 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
887 optlen);
888 else
889 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
890 break;
891 case IPV6_ROUTER_ALERT:
892 if (optlen < sizeof(int))
893 goto e_inval;
894 retv = ip6_ra_control(sk, val);
895 break;
896 case IPV6_ROUTER_ALERT_ISOLATE:
897 if (optlen < sizeof(int))
898 goto e_inval;
899 np->rtalert_isolate = valbool;
900 retv = 0;
901 break;
902 case IPV6_MTU_DISCOVER:
903 if (optlen < sizeof(int))
904 goto e_inval;
905 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
906 goto e_inval;
907 np->pmtudisc = val;
908 retv = 0;
909 break;
910 case IPV6_MTU:
911 if (optlen < sizeof(int))
912 goto e_inval;
913 if (val && val < IPV6_MIN_MTU)
914 goto e_inval;
915 np->frag_size = val;
916 retv = 0;
917 break;
918 case IPV6_RECVERR:
919 if (optlen < sizeof(int))
920 goto e_inval;
921 np->recverr = valbool;
922 if (!val)
923 skb_queue_purge(&sk->sk_error_queue);
924 retv = 0;
925 break;
926 case IPV6_FLOWINFO_SEND:
927 if (optlen < sizeof(int))
928 goto e_inval;
929 np->sndflow = valbool;
930 retv = 0;
931 break;
932 case IPV6_FLOWLABEL_MGR:
933 retv = ipv6_flowlabel_opt(sk, optval, optlen);
934 break;
935 case IPV6_IPSEC_POLICY:
936 case IPV6_XFRM_POLICY:
937 retv = -EPERM;
938 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
939 break;
940 retv = xfrm_user_policy(sk, optname, optval, optlen);
941 break;
942
943 case IPV6_ADDR_PREFERENCES:
944 if (optlen < sizeof(int))
945 goto e_inval;
946 retv = __ip6_sock_set_addr_preferences(sk, val);
947 break;
948 case IPV6_MINHOPCOUNT:
949 if (optlen < sizeof(int))
950 goto e_inval;
951 if (val < 0 || val > 255)
952 goto e_inval;
953 np->min_hopcount = val;
954 retv = 0;
955 break;
956 case IPV6_DONTFRAG:
957 np->dontfrag = valbool;
958 retv = 0;
959 break;
960 case IPV6_AUTOFLOWLABEL:
961 np->autoflowlabel = valbool;
962 np->autoflowlabel_set = 1;
963 retv = 0;
964 break;
965 case IPV6_RECVFRAGSIZE:
966 np->rxopt.bits.recvfragsize = valbool;
967 retv = 0;
968 break;
969 case IPV6_RECVERR_RFC4884:
970 if (optlen < sizeof(int))
971 goto e_inval;
972 if (val < 0 || val > 1)
973 goto e_inval;
974 np->recverr_rfc4884 = valbool;
975 retv = 0;
976 break;
977 }
978
979 release_sock(sk);
980 if (needs_rtnl)
981 rtnl_unlock();
982
983 return retv;
984
985e_inval:
986 release_sock(sk);
987 if (needs_rtnl)
988 rtnl_unlock();
989 return -EINVAL;
990}
991
992int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
993 unsigned int optlen)
994{
995 int err;
996
997 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
998 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
999
1000 if (level != SOL_IPV6)
1001 return -ENOPROTOOPT;
1002
1003 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1004#ifdef CONFIG_NETFILTER
1005 /* we need to exclude all possible ENOPROTOOPTs except default case */
1006 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1007 optname != IPV6_XFRM_POLICY)
1008 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1009#endif
1010 return err;
1011}
1012EXPORT_SYMBOL(ipv6_setsockopt);
1013
1014static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1015 int optname, char __user *optval, int len)
1016{
1017 struct ipv6_opt_hdr *hdr;
1018
1019 if (!opt)
1020 return 0;
1021
1022 switch (optname) {
1023 case IPV6_HOPOPTS:
1024 hdr = opt->hopopt;
1025 break;
1026 case IPV6_RTHDRDSTOPTS:
1027 hdr = opt->dst0opt;
1028 break;
1029 case IPV6_RTHDR:
1030 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1031 break;
1032 case IPV6_DSTOPTS:
1033 hdr = opt->dst1opt;
1034 break;
1035 default:
1036 return -EINVAL; /* should not happen */
1037 }
1038
1039 if (!hdr)
1040 return 0;
1041
1042 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1043 if (copy_to_user(optval, hdr, len))
1044 return -EFAULT;
1045 return len;
1046}
1047
1048static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1049 int __user *optlen, int len)
1050{
1051 const int size0 = offsetof(struct group_filter, gf_slist);
1052 struct group_filter __user *p = optval;
1053 struct group_filter gsf;
1054 int num;
1055 int err;
1056
1057 if (len < size0)
1058 return -EINVAL;
1059 if (copy_from_user(&gsf, p, size0))
1060 return -EFAULT;
1061 if (gsf.gf_group.ss_family != AF_INET6)
1062 return -EADDRNOTAVAIL;
1063 num = gsf.gf_numsrc;
1064 lock_sock(sk);
1065 err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
1066 if (!err) {
1067 if (num > gsf.gf_numsrc)
1068 num = gsf.gf_numsrc;
1069 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1070 copy_to_user(p, &gsf, size0))
1071 err = -EFAULT;
1072 }
1073 release_sock(sk);
1074 return err;
1075}
1076
1077static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1078 int __user *optlen)
1079{
1080 const int size0 = offsetof(struct compat_group_filter, gf_slist);
1081 struct compat_group_filter __user *p = optval;
1082 struct compat_group_filter gf32;
1083 struct group_filter gf;
1084 int len, err;
1085 int num;
1086
1087 if (get_user(len, optlen))
1088 return -EFAULT;
1089 if (len < size0)
1090 return -EINVAL;
1091
1092 if (copy_from_user(&gf32, p, size0))
1093 return -EFAULT;
1094 gf.gf_interface = gf32.gf_interface;
1095 gf.gf_fmode = gf32.gf_fmode;
1096 num = gf.gf_numsrc = gf32.gf_numsrc;
1097 gf.gf_group = gf32.gf_group;
1098
1099 if (gf.gf_group.ss_family != AF_INET6)
1100 return -EADDRNOTAVAIL;
1101
1102 lock_sock(sk);
1103 err = ip6_mc_msfget(sk, &gf, p->gf_slist);
1104 release_sock(sk);
1105 if (err)
1106 return err;
1107 if (num > gf.gf_numsrc)
1108 num = gf.gf_numsrc;
1109 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1110 if (put_user(len, optlen) ||
1111 put_user(gf.gf_fmode, &p->gf_fmode) ||
1112 put_user(gf.gf_numsrc, &p->gf_numsrc))
1113 return -EFAULT;
1114 return 0;
1115}
1116
1117static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1118 char __user *optval, int __user *optlen, unsigned int flags)
1119{
1120 struct ipv6_pinfo *np = inet6_sk(sk);
1121 int len;
1122 int val;
1123
1124 if (ip6_mroute_opt(optname))
1125 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1126
1127 if (get_user(len, optlen))
1128 return -EFAULT;
1129 switch (optname) {
1130 case IPV6_ADDRFORM:
1131 if (sk->sk_protocol != IPPROTO_UDP &&
1132 sk->sk_protocol != IPPROTO_UDPLITE &&
1133 sk->sk_protocol != IPPROTO_TCP)
1134 return -ENOPROTOOPT;
1135 if (sk->sk_state != TCP_ESTABLISHED)
1136 return -ENOTCONN;
1137 val = sk->sk_family;
1138 break;
1139 case MCAST_MSFILTER:
1140 if (in_compat_syscall())
1141 return compat_ipv6_get_msfilter(sk, optval, optlen);
1142 return ipv6_get_msfilter(sk, optval, optlen, len);
1143 case IPV6_2292PKTOPTIONS:
1144 {
1145 struct msghdr msg;
1146 struct sk_buff *skb;
1147
1148 if (sk->sk_type != SOCK_STREAM)
1149 return -ENOPROTOOPT;
1150
1151 msg.msg_control = optval;
1152 msg.msg_controllen = len;
1153 msg.msg_flags = flags;
1154 msg.msg_control_is_user = true;
1155
1156 lock_sock(sk);
1157 skb = np->pktoptions;
1158 if (skb)
1159 ip6_datagram_recv_ctl(sk, &msg, skb);
1160 release_sock(sk);
1161 if (!skb) {
1162 if (np->rxopt.bits.rxinfo) {
1163 struct in6_pktinfo src_info;
1164 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1165 np->sticky_pktinfo.ipi6_ifindex;
1166 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1167 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1168 }
1169 if (np->rxopt.bits.rxhlim) {
1170 int hlim = np->mcast_hops;
1171 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1172 }
1173 if (np->rxopt.bits.rxtclass) {
1174 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1175
1176 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1177 }
1178 if (np->rxopt.bits.rxoinfo) {
1179 struct in6_pktinfo src_info;
1180 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1181 np->sticky_pktinfo.ipi6_ifindex;
1182 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1183 np->sticky_pktinfo.ipi6_addr;
1184 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1185 }
1186 if (np->rxopt.bits.rxohlim) {
1187 int hlim = np->mcast_hops;
1188 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1189 }
1190 if (np->rxopt.bits.rxflow) {
1191 __be32 flowinfo = np->rcv_flowinfo;
1192
1193 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1194 }
1195 }
1196 len -= msg.msg_controllen;
1197 return put_user(len, optlen);
1198 }
1199 case IPV6_MTU:
1200 {
1201 struct dst_entry *dst;
1202
1203 val = 0;
1204 rcu_read_lock();
1205 dst = __sk_dst_get(sk);
1206 if (dst)
1207 val = dst_mtu(dst);
1208 rcu_read_unlock();
1209 if (!val)
1210 return -ENOTCONN;
1211 break;
1212 }
1213
1214 case IPV6_V6ONLY:
1215 val = sk->sk_ipv6only;
1216 break;
1217
1218 case IPV6_RECVPKTINFO:
1219 val = np->rxopt.bits.rxinfo;
1220 break;
1221
1222 case IPV6_2292PKTINFO:
1223 val = np->rxopt.bits.rxoinfo;
1224 break;
1225
1226 case IPV6_RECVHOPLIMIT:
1227 val = np->rxopt.bits.rxhlim;
1228 break;
1229
1230 case IPV6_2292HOPLIMIT:
1231 val = np->rxopt.bits.rxohlim;
1232 break;
1233
1234 case IPV6_RECVRTHDR:
1235 val = np->rxopt.bits.srcrt;
1236 break;
1237
1238 case IPV6_2292RTHDR:
1239 val = np->rxopt.bits.osrcrt;
1240 break;
1241
1242 case IPV6_HOPOPTS:
1243 case IPV6_RTHDRDSTOPTS:
1244 case IPV6_RTHDR:
1245 case IPV6_DSTOPTS:
1246 {
1247 struct ipv6_txoptions *opt;
1248
1249 lock_sock(sk);
1250 opt = rcu_dereference_protected(np->opt,
1251 lockdep_sock_is_held(sk));
1252 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1253 release_sock(sk);
1254 /* check if ipv6_getsockopt_sticky() returns err code */
1255 if (len < 0)
1256 return len;
1257 return put_user(len, optlen);
1258 }
1259
1260 case IPV6_RECVHOPOPTS:
1261 val = np->rxopt.bits.hopopts;
1262 break;
1263
1264 case IPV6_2292HOPOPTS:
1265 val = np->rxopt.bits.ohopopts;
1266 break;
1267
1268 case IPV6_RECVDSTOPTS:
1269 val = np->rxopt.bits.dstopts;
1270 break;
1271
1272 case IPV6_2292DSTOPTS:
1273 val = np->rxopt.bits.odstopts;
1274 break;
1275
1276 case IPV6_TCLASS:
1277 val = np->tclass;
1278 break;
1279
1280 case IPV6_RECVTCLASS:
1281 val = np->rxopt.bits.rxtclass;
1282 break;
1283
1284 case IPV6_FLOWINFO:
1285 val = np->rxopt.bits.rxflow;
1286 break;
1287
1288 case IPV6_RECVPATHMTU:
1289 val = np->rxopt.bits.rxpmtu;
1290 break;
1291
1292 case IPV6_PATHMTU:
1293 {
1294 struct dst_entry *dst;
1295 struct ip6_mtuinfo mtuinfo;
1296
1297 if (len < sizeof(mtuinfo))
1298 return -EINVAL;
1299
1300 len = sizeof(mtuinfo);
1301 memset(&mtuinfo, 0, sizeof(mtuinfo));
1302
1303 rcu_read_lock();
1304 dst = __sk_dst_get(sk);
1305 if (dst)
1306 mtuinfo.ip6m_mtu = dst_mtu(dst);
1307 rcu_read_unlock();
1308 if (!mtuinfo.ip6m_mtu)
1309 return -ENOTCONN;
1310
1311 if (put_user(len, optlen))
1312 return -EFAULT;
1313 if (copy_to_user(optval, &mtuinfo, len))
1314 return -EFAULT;
1315
1316 return 0;
1317 }
1318
1319 case IPV6_TRANSPARENT:
1320 val = inet_sk(sk)->transparent;
1321 break;
1322
1323 case IPV6_FREEBIND:
1324 val = inet_sk(sk)->freebind;
1325 break;
1326
1327 case IPV6_RECVORIGDSTADDR:
1328 val = np->rxopt.bits.rxorigdstaddr;
1329 break;
1330
1331 case IPV6_UNICAST_HOPS:
1332 case IPV6_MULTICAST_HOPS:
1333 {
1334 struct dst_entry *dst;
1335
1336 if (optname == IPV6_UNICAST_HOPS)
1337 val = np->hop_limit;
1338 else
1339 val = np->mcast_hops;
1340
1341 if (val < 0) {
1342 rcu_read_lock();
1343 dst = __sk_dst_get(sk);
1344 if (dst)
1345 val = ip6_dst_hoplimit(dst);
1346 rcu_read_unlock();
1347 }
1348
1349 if (val < 0)
1350 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1351 break;
1352 }
1353
1354 case IPV6_MULTICAST_LOOP:
1355 val = np->mc_loop;
1356 break;
1357
1358 case IPV6_MULTICAST_IF:
1359 val = np->mcast_oif;
1360 break;
1361
1362 case IPV6_MULTICAST_ALL:
1363 val = np->mc_all;
1364 break;
1365
1366 case IPV6_UNICAST_IF:
1367 val = (__force int)htonl((__u32) np->ucast_oif);
1368 break;
1369
1370 case IPV6_MTU_DISCOVER:
1371 val = np->pmtudisc;
1372 break;
1373
1374 case IPV6_RECVERR:
1375 val = np->recverr;
1376 break;
1377
1378 case IPV6_FLOWINFO_SEND:
1379 val = np->sndflow;
1380 break;
1381
1382 case IPV6_FLOWLABEL_MGR:
1383 {
1384 struct in6_flowlabel_req freq;
1385 int flags;
1386
1387 if (len < sizeof(freq))
1388 return -EINVAL;
1389
1390 if (copy_from_user(&freq, optval, sizeof(freq)))
1391 return -EFAULT;
1392
1393 if (freq.flr_action != IPV6_FL_A_GET)
1394 return -EINVAL;
1395
1396 len = sizeof(freq);
1397 flags = freq.flr_flags;
1398
1399 memset(&freq, 0, sizeof(freq));
1400
1401 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1402 if (val < 0)
1403 return val;
1404
1405 if (put_user(len, optlen))
1406 return -EFAULT;
1407 if (copy_to_user(optval, &freq, len))
1408 return -EFAULT;
1409
1410 return 0;
1411 }
1412
1413 case IPV6_ADDR_PREFERENCES:
1414 val = 0;
1415
1416 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1417 val |= IPV6_PREFER_SRC_TMP;
1418 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1419 val |= IPV6_PREFER_SRC_PUBLIC;
1420 else {
1421 /* XXX: should we return system default? */
1422 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1423 }
1424
1425 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1426 val |= IPV6_PREFER_SRC_COA;
1427 else
1428 val |= IPV6_PREFER_SRC_HOME;
1429 break;
1430
1431 case IPV6_MINHOPCOUNT:
1432 val = np->min_hopcount;
1433 break;
1434
1435 case IPV6_DONTFRAG:
1436 val = np->dontfrag;
1437 break;
1438
1439 case IPV6_AUTOFLOWLABEL:
1440 val = ip6_autoflowlabel(sock_net(sk), np);
1441 break;
1442
1443 case IPV6_RECVFRAGSIZE:
1444 val = np->rxopt.bits.recvfragsize;
1445 break;
1446
1447 case IPV6_ROUTER_ALERT_ISOLATE:
1448 val = np->rtalert_isolate;
1449 break;
1450
1451 case IPV6_RECVERR_RFC4884:
1452 val = np->recverr_rfc4884;
1453 break;
1454
1455 default:
1456 return -ENOPROTOOPT;
1457 }
1458 len = min_t(unsigned int, sizeof(int), len);
1459 if (put_user(len, optlen))
1460 return -EFAULT;
1461 if (copy_to_user(optval, &val, len))
1462 return -EFAULT;
1463 return 0;
1464}
1465
1466int ipv6_getsockopt(struct sock *sk, int level, int optname,
1467 char __user *optval, int __user *optlen)
1468{
1469 int err;
1470
1471 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1472 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1473
1474 if (level != SOL_IPV6)
1475 return -ENOPROTOOPT;
1476
1477 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1478#ifdef CONFIG_NETFILTER
1479 /* we need to exclude all possible ENOPROTOOPTs except default case */
1480 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1481 int len;
1482
1483 if (get_user(len, optlen))
1484 return -EFAULT;
1485
1486 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1487 if (err >= 0)
1488 err = put_user(len, optlen);
1489 }
1490#endif
1491 return err;
1492}
1493EXPORT_SYMBOL(ipv6_getsockopt);