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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/*
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
59struct ip6_ra_chain *ip6_ra_chain;
60DEFINE_RWLOCK(ip6_ra_lock);
61
62int 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
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 }
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119}
120
121static 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
141static 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 sk->sk_destruct = inet_sock_destruct;
246 /*
247 * ... and add it to the refcnt debug socks count
248 * in the new family. -acme
249 */
250 sk_refcnt_debug_inc(sk);
251 module_put(THIS_MODULE);
252 retv = 0;
253 break;
254 }
255 goto e_inval;
256
257 case IPV6_V6ONLY:
258 if (optlen < sizeof(int) ||
259 inet_sk(sk)->inet_num)
260 goto e_inval;
261 sk->sk_ipv6only = valbool;
262 retv = 0;
263 break;
264
265 case IPV6_RECVPKTINFO:
266 if (optlen < sizeof(int))
267 goto e_inval;
268 np->rxopt.bits.rxinfo = valbool;
269 retv = 0;
270 break;
271
272 case IPV6_2292PKTINFO:
273 if (optlen < sizeof(int))
274 goto e_inval;
275 np->rxopt.bits.rxoinfo = valbool;
276 retv = 0;
277 break;
278
279 case IPV6_RECVHOPLIMIT:
280 if (optlen < sizeof(int))
281 goto e_inval;
282 np->rxopt.bits.rxhlim = valbool;
283 retv = 0;
284 break;
285
286 case IPV6_2292HOPLIMIT:
287 if (optlen < sizeof(int))
288 goto e_inval;
289 np->rxopt.bits.rxohlim = valbool;
290 retv = 0;
291 break;
292
293 case IPV6_RECVRTHDR:
294 if (optlen < sizeof(int))
295 goto e_inval;
296 np->rxopt.bits.srcrt = valbool;
297 retv = 0;
298 break;
299
300 case IPV6_2292RTHDR:
301 if (optlen < sizeof(int))
302 goto e_inval;
303 np->rxopt.bits.osrcrt = valbool;
304 retv = 0;
305 break;
306
307 case IPV6_RECVHOPOPTS:
308 if (optlen < sizeof(int))
309 goto e_inval;
310 np->rxopt.bits.hopopts = valbool;
311 retv = 0;
312 break;
313
314 case IPV6_2292HOPOPTS:
315 if (optlen < sizeof(int))
316 goto e_inval;
317 np->rxopt.bits.ohopopts = valbool;
318 retv = 0;
319 break;
320
321 case IPV6_RECVDSTOPTS:
322 if (optlen < sizeof(int))
323 goto e_inval;
324 np->rxopt.bits.dstopts = valbool;
325 retv = 0;
326 break;
327
328 case IPV6_2292DSTOPTS:
329 if (optlen < sizeof(int))
330 goto e_inval;
331 np->rxopt.bits.odstopts = valbool;
332 retv = 0;
333 break;
334
335 case IPV6_TCLASS:
336 if (optlen < sizeof(int))
337 goto e_inval;
338 if (val < -1 || val > 0xff)
339 goto e_inval;
340 /* RFC 3542, 6.5: default traffic class of 0x0 */
341 if (val == -1)
342 val = 0;
343 np->tclass = val;
344 retv = 0;
345 break;
346
347 case IPV6_RECVTCLASS:
348 if (optlen < sizeof(int))
349 goto e_inval;
350 np->rxopt.bits.rxtclass = valbool;
351 retv = 0;
352 break;
353
354 case IPV6_FLOWINFO:
355 if (optlen < sizeof(int))
356 goto e_inval;
357 np->rxopt.bits.rxflow = valbool;
358 retv = 0;
359 break;
360
361 case IPV6_RECVPATHMTU:
362 if (optlen < sizeof(int))
363 goto e_inval;
364 np->rxopt.bits.rxpmtu = valbool;
365 retv = 0;
366 break;
367
368 case IPV6_TRANSPARENT:
369 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
370 !ns_capable(net->user_ns, CAP_NET_RAW)) {
371 retv = -EPERM;
372 break;
373 }
374 if (optlen < sizeof(int))
375 goto e_inval;
376 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
377 inet_sk(sk)->transparent = valbool;
378 retv = 0;
379 break;
380
381 case IPV6_RECVORIGDSTADDR:
382 if (optlen < sizeof(int))
383 goto e_inval;
384 np->rxopt.bits.rxorigdstaddr = valbool;
385 retv = 0;
386 break;
387
388 case IPV6_HOPOPTS:
389 case IPV6_RTHDRDSTOPTS:
390 case IPV6_RTHDR:
391 case IPV6_DSTOPTS:
392 {
393 struct ipv6_txoptions *opt;
394
395 /* remove any sticky options header with a zero option
396 * length, per RFC3542.
397 */
398 if (optlen == 0)
399 optval = NULL;
400 else if (!optval)
401 goto e_inval;
402 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
403 optlen & 0x7 || optlen > 8 * 255)
404 goto e_inval;
405
406 /* hop-by-hop / destination options are privileged option */
407 retv = -EPERM;
408 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
409 break;
410
411 opt = rcu_dereference_protected(np->opt,
412 lockdep_sock_is_held(sk));
413 opt = ipv6_renew_options(sk, opt, optname,
414 (struct ipv6_opt_hdr __user *)optval,
415 optlen);
416 if (IS_ERR(opt)) {
417 retv = PTR_ERR(opt);
418 break;
419 }
420
421 /* routing header option needs extra check */
422 retv = -EINVAL;
423 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
424 struct ipv6_rt_hdr *rthdr = opt->srcrt;
425 switch (rthdr->type) {
426#if IS_ENABLED(CONFIG_IPV6_MIP6)
427 case IPV6_SRCRT_TYPE_2:
428 if (rthdr->hdrlen != 2 ||
429 rthdr->segments_left != 1)
430 goto sticky_done;
431
432 break;
433#endif
434 case IPV6_SRCRT_TYPE_4:
435 {
436 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
437 opt->srcrt;
438
439 if (!seg6_validate_srh(srh, optlen))
440 goto sticky_done;
441 break;
442 }
443 default:
444 goto sticky_done;
445 }
446 }
447
448 retv = 0;
449 opt = ipv6_update_options(sk, opt);
450sticky_done:
451 if (opt) {
452 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
453 txopt_put(opt);
454 }
455 break;
456 }
457
458 case IPV6_PKTINFO:
459 {
460 struct in6_pktinfo pkt;
461
462 if (optlen == 0)
463 goto e_inval;
464 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
465 goto e_inval;
466
467 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
468 retv = -EFAULT;
469 break;
470 }
471 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
472 goto e_inval;
473
474 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
475 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
476 retv = 0;
477 break;
478 }
479
480 case IPV6_2292PKTOPTIONS:
481 {
482 struct ipv6_txoptions *opt = NULL;
483 struct msghdr msg;
484 struct flowi6 fl6;
485 struct sockcm_cookie sockc_junk;
486 struct ipcm6_cookie ipc6;
487
488 memset(&fl6, 0, sizeof(fl6));
489 fl6.flowi6_oif = sk->sk_bound_dev_if;
490 fl6.flowi6_mark = sk->sk_mark;
491
492 if (optlen == 0)
493 goto update;
494
495 /* 1K is probably excessive
496 * 1K is surely not enough, 2K per standard header is 16K.
497 */
498 retv = -EINVAL;
499 if (optlen > 64*1024)
500 break;
501
502 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
503 retv = -ENOBUFS;
504 if (!opt)
505 break;
506
507 memset(opt, 0, sizeof(*opt));
508 atomic_set(&opt->refcnt, 1);
509 opt->tot_len = sizeof(*opt) + optlen;
510 retv = -EFAULT;
511 if (copy_from_user(opt+1, optval, optlen))
512 goto done;
513
514 msg.msg_controllen = optlen;
515 msg.msg_control = (void *)(opt+1);
516 ipc6.opt = opt;
517
518 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
519 if (retv)
520 goto done;
521update:
522 retv = 0;
523 opt = ipv6_update_options(sk, opt);
524done:
525 if (opt) {
526 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
527 txopt_put(opt);
528 }
529 break;
530 }
531 case IPV6_UNICAST_HOPS:
532 if (optlen < sizeof(int))
533 goto e_inval;
534 if (val > 255 || val < -1)
535 goto e_inval;
536 np->hop_limit = val;
537 retv = 0;
538 break;
539
540 case IPV6_MULTICAST_HOPS:
541 if (sk->sk_type == SOCK_STREAM)
542 break;
543 if (optlen < sizeof(int))
544 goto e_inval;
545 if (val > 255 || val < -1)
546 goto e_inval;
547 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
548 retv = 0;
549 break;
550
551 case IPV6_MULTICAST_LOOP:
552 if (optlen < sizeof(int))
553 goto e_inval;
554 if (val != valbool)
555 goto e_inval;
556 np->mc_loop = valbool;
557 retv = 0;
558 break;
559
560 case IPV6_UNICAST_IF:
561 {
562 struct net_device *dev = NULL;
563 int ifindex;
564
565 if (optlen != sizeof(int))
566 goto e_inval;
567
568 ifindex = (__force int)ntohl((__force __be32)val);
569 if (ifindex == 0) {
570 np->ucast_oif = 0;
571 retv = 0;
572 break;
573 }
574
575 dev = dev_get_by_index(net, ifindex);
576 retv = -EADDRNOTAVAIL;
577 if (!dev)
578 break;
579 dev_put(dev);
580
581 retv = -EINVAL;
582 if (sk->sk_bound_dev_if)
583 break;
584
585 np->ucast_oif = ifindex;
586 retv = 0;
587 break;
588 }
589
590 case IPV6_MULTICAST_IF:
591 if (sk->sk_type == SOCK_STREAM)
592 break;
593 if (optlen < sizeof(int))
594 goto e_inval;
595
596 if (val) {
597 struct net_device *dev;
598
599 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
600 goto e_inval;
601
602 dev = dev_get_by_index(net, val);
603 if (!dev) {
604 retv = -ENODEV;
605 break;
606 }
607 dev_put(dev);
608 }
609 np->mcast_oif = val;
610 retv = 0;
611 break;
612 case IPV6_ADD_MEMBERSHIP:
613 case IPV6_DROP_MEMBERSHIP:
614 {
615 struct ipv6_mreq mreq;
616
617 if (optlen < sizeof(struct ipv6_mreq))
618 goto e_inval;
619
620 retv = -EPROTO;
621 if (inet_sk(sk)->is_icsk)
622 break;
623
624 retv = -EFAULT;
625 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
626 break;
627
628 if (optname == IPV6_ADD_MEMBERSHIP)
629 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
630 else
631 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
632 break;
633 }
634 case IPV6_JOIN_ANYCAST:
635 case IPV6_LEAVE_ANYCAST:
636 {
637 struct ipv6_mreq mreq;
638
639 if (optlen < sizeof(struct ipv6_mreq))
640 goto e_inval;
641
642 retv = -EFAULT;
643 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
644 break;
645
646 if (optname == IPV6_JOIN_ANYCAST)
647 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
648 else
649 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
650 break;
651 }
652 case MCAST_JOIN_GROUP:
653 case MCAST_LEAVE_GROUP:
654 {
655 struct group_req greq;
656 struct sockaddr_in6 *psin6;
657
658 if (optlen < sizeof(struct group_req))
659 goto e_inval;
660
661 retv = -EFAULT;
662 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
663 break;
664 if (greq.gr_group.ss_family != AF_INET6) {
665 retv = -EADDRNOTAVAIL;
666 break;
667 }
668 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
669 if (optname == MCAST_JOIN_GROUP)
670 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
671 &psin6->sin6_addr);
672 else
673 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
674 &psin6->sin6_addr);
675 break;
676 }
677 case MCAST_JOIN_SOURCE_GROUP:
678 case MCAST_LEAVE_SOURCE_GROUP:
679 case MCAST_BLOCK_SOURCE:
680 case MCAST_UNBLOCK_SOURCE:
681 {
682 struct group_source_req greqs;
683 int omode, add;
684
685 if (optlen < sizeof(struct group_source_req))
686 goto e_inval;
687 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
688 retv = -EFAULT;
689 break;
690 }
691 if (greqs.gsr_group.ss_family != AF_INET6 ||
692 greqs.gsr_source.ss_family != AF_INET6) {
693 retv = -EADDRNOTAVAIL;
694 break;
695 }
696 if (optname == MCAST_BLOCK_SOURCE) {
697 omode = MCAST_EXCLUDE;
698 add = 1;
699 } else if (optname == MCAST_UNBLOCK_SOURCE) {
700 omode = MCAST_EXCLUDE;
701 add = 0;
702 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
703 struct sockaddr_in6 *psin6;
704
705 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
706 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
707 &psin6->sin6_addr);
708 /* prior join w/ different source is ok */
709 if (retv && retv != -EADDRINUSE)
710 break;
711 omode = MCAST_INCLUDE;
712 add = 1;
713 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
714 omode = MCAST_INCLUDE;
715 add = 0;
716 }
717 retv = ip6_mc_source(add, omode, sk, &greqs);
718 break;
719 }
720 case MCAST_MSFILTER:
721 {
722 struct group_filter *gsf;
723
724 if (optlen < GROUP_FILTER_SIZE(0))
725 goto e_inval;
726 if (optlen > sysctl_optmem_max) {
727 retv = -ENOBUFS;
728 break;
729 }
730 gsf = kmalloc(optlen, GFP_KERNEL);
731 if (!gsf) {
732 retv = -ENOBUFS;
733 break;
734 }
735 retv = -EFAULT;
736 if (copy_from_user(gsf, optval, optlen)) {
737 kfree(gsf);
738 break;
739 }
740 /* numsrc >= (4G-140)/128 overflow in 32 bits */
741 if (gsf->gf_numsrc >= 0x1ffffffU ||
742 gsf->gf_numsrc > sysctl_mld_max_msf) {
743 kfree(gsf);
744 retv = -ENOBUFS;
745 break;
746 }
747 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
748 kfree(gsf);
749 retv = -EINVAL;
750 break;
751 }
752 retv = ip6_mc_msfilter(sk, gsf);
753 kfree(gsf);
754
755 break;
756 }
757 case IPV6_ROUTER_ALERT:
758 if (optlen < sizeof(int))
759 goto e_inval;
760 retv = ip6_ra_control(sk, val);
761 break;
762 case IPV6_MTU_DISCOVER:
763 if (optlen < sizeof(int))
764 goto e_inval;
765 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
766 goto e_inval;
767 np->pmtudisc = val;
768 retv = 0;
769 break;
770 case IPV6_MTU:
771 if (optlen < sizeof(int))
772 goto e_inval;
773 if (val && val < IPV6_MIN_MTU)
774 goto e_inval;
775 np->frag_size = val;
776 retv = 0;
777 break;
778 case IPV6_RECVERR:
779 if (optlen < sizeof(int))
780 goto e_inval;
781 np->recverr = valbool;
782 if (!val)
783 skb_queue_purge(&sk->sk_error_queue);
784 retv = 0;
785 break;
786 case IPV6_FLOWINFO_SEND:
787 if (optlen < sizeof(int))
788 goto e_inval;
789 np->sndflow = valbool;
790 retv = 0;
791 break;
792 case IPV6_FLOWLABEL_MGR:
793 retv = ipv6_flowlabel_opt(sk, optval, optlen);
794 break;
795 case IPV6_IPSEC_POLICY:
796 case IPV6_XFRM_POLICY:
797 retv = -EPERM;
798 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
799 break;
800 retv = xfrm_user_policy(sk, optname, optval, optlen);
801 break;
802
803 case IPV6_ADDR_PREFERENCES:
804 {
805 unsigned int pref = 0;
806 unsigned int prefmask = ~0;
807
808 if (optlen < sizeof(int))
809 goto e_inval;
810
811 retv = -EINVAL;
812
813 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
814 switch (val & (IPV6_PREFER_SRC_PUBLIC|
815 IPV6_PREFER_SRC_TMP|
816 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
817 case IPV6_PREFER_SRC_PUBLIC:
818 pref |= IPV6_PREFER_SRC_PUBLIC;
819 break;
820 case IPV6_PREFER_SRC_TMP:
821 pref |= IPV6_PREFER_SRC_TMP;
822 break;
823 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
824 break;
825 case 0:
826 goto pref_skip_pubtmp;
827 default:
828 goto e_inval;
829 }
830
831 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
832 IPV6_PREFER_SRC_TMP);
833pref_skip_pubtmp:
834
835 /* check HOME/COA conflicts */
836 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
837 case IPV6_PREFER_SRC_HOME:
838 break;
839 case IPV6_PREFER_SRC_COA:
840 pref |= IPV6_PREFER_SRC_COA;
841 case 0:
842 goto pref_skip_coa;
843 default:
844 goto e_inval;
845 }
846
847 prefmask &= ~IPV6_PREFER_SRC_COA;
848pref_skip_coa:
849
850 /* check CGA/NONCGA conflicts */
851 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
852 case IPV6_PREFER_SRC_CGA:
853 case IPV6_PREFER_SRC_NONCGA:
854 case 0:
855 break;
856 default:
857 goto e_inval;
858 }
859
860 np->srcprefs = (np->srcprefs & prefmask) | pref;
861 retv = 0;
862
863 break;
864 }
865 case IPV6_MINHOPCOUNT:
866 if (optlen < sizeof(int))
867 goto e_inval;
868 if (val < 0 || val > 255)
869 goto e_inval;
870 np->min_hopcount = val;
871 retv = 0;
872 break;
873 case IPV6_DONTFRAG:
874 np->dontfrag = valbool;
875 retv = 0;
876 break;
877 case IPV6_AUTOFLOWLABEL:
878 np->autoflowlabel = valbool;
879 retv = 0;
880 break;
881 case IPV6_RECVFRAGSIZE:
882 np->rxopt.bits.recvfragsize = valbool;
883 retv = 0;
884 break;
885 }
886
887 release_sock(sk);
888 if (needs_rtnl)
889 rtnl_unlock();
890
891 return retv;
892
893e_inval:
894 release_sock(sk);
895 if (needs_rtnl)
896 rtnl_unlock();
897 return -EINVAL;
898}
899
900int ipv6_setsockopt(struct sock *sk, int level, int optname,
901 char __user *optval, unsigned int optlen)
902{
903 int err;
904
905 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
906 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
907
908 if (level != SOL_IPV6)
909 return -ENOPROTOOPT;
910
911 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
912#ifdef CONFIG_NETFILTER
913 /* we need to exclude all possible ENOPROTOOPTs except default case */
914 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
915 optname != IPV6_XFRM_POLICY) {
916 lock_sock(sk);
917 err = nf_setsockopt(sk, PF_INET6, optname, optval,
918 optlen);
919 release_sock(sk);
920 }
921#endif
922 return err;
923}
924EXPORT_SYMBOL(ipv6_setsockopt);
925
926#ifdef CONFIG_COMPAT
927int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
928 char __user *optval, unsigned int optlen)
929{
930 int err;
931
932 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
933 if (udp_prot.compat_setsockopt != NULL)
934 return udp_prot.compat_setsockopt(sk, level, optname,
935 optval, optlen);
936 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
937 }
938
939 if (level != SOL_IPV6)
940 return -ENOPROTOOPT;
941
942 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
943 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
944 ipv6_setsockopt);
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 lock_sock(sk);
952 err = compat_nf_setsockopt(sk, PF_INET6, optname,
953 optval, optlen);
954 release_sock(sk);
955 }
956#endif
957 return err;
958}
959EXPORT_SYMBOL(compat_ipv6_setsockopt);
960#endif
961
962static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
963 int optname, char __user *optval, int len)
964{
965 struct ipv6_opt_hdr *hdr;
966
967 if (!opt)
968 return 0;
969
970 switch (optname) {
971 case IPV6_HOPOPTS:
972 hdr = opt->hopopt;
973 break;
974 case IPV6_RTHDRDSTOPTS:
975 hdr = opt->dst0opt;
976 break;
977 case IPV6_RTHDR:
978 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
979 break;
980 case IPV6_DSTOPTS:
981 hdr = opt->dst1opt;
982 break;
983 default:
984 return -EINVAL; /* should not happen */
985 }
986
987 if (!hdr)
988 return 0;
989
990 len = min_t(unsigned int, len, ipv6_optlen(hdr));
991 if (copy_to_user(optval, hdr, len))
992 return -EFAULT;
993 return len;
994}
995
996static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
997 char __user *optval, int __user *optlen, unsigned int flags)
998{
999 struct ipv6_pinfo *np = inet6_sk(sk);
1000 int len;
1001 int val;
1002
1003 if (ip6_mroute_opt(optname))
1004 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1005
1006 if (get_user(len, optlen))
1007 return -EFAULT;
1008 switch (optname) {
1009 case IPV6_ADDRFORM:
1010 if (sk->sk_protocol != IPPROTO_UDP &&
1011 sk->sk_protocol != IPPROTO_UDPLITE &&
1012 sk->sk_protocol != IPPROTO_TCP)
1013 return -ENOPROTOOPT;
1014 if (sk->sk_state != TCP_ESTABLISHED)
1015 return -ENOTCONN;
1016 val = sk->sk_family;
1017 break;
1018 case MCAST_MSFILTER:
1019 {
1020 struct group_filter gsf;
1021 int err;
1022
1023 if (len < GROUP_FILTER_SIZE(0))
1024 return -EINVAL;
1025 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1026 return -EFAULT;
1027 if (gsf.gf_group.ss_family != AF_INET6)
1028 return -EADDRNOTAVAIL;
1029 lock_sock(sk);
1030 err = ip6_mc_msfget(sk, &gsf,
1031 (struct group_filter __user *)optval, optlen);
1032 release_sock(sk);
1033 return err;
1034 }
1035
1036 case IPV6_2292PKTOPTIONS:
1037 {
1038 struct msghdr msg;
1039 struct sk_buff *skb;
1040
1041 if (sk->sk_type != SOCK_STREAM)
1042 return -ENOPROTOOPT;
1043
1044 msg.msg_control = optval;
1045 msg.msg_controllen = len;
1046 msg.msg_flags = flags;
1047
1048 lock_sock(sk);
1049 skb = np->pktoptions;
1050 if (skb)
1051 ip6_datagram_recv_ctl(sk, &msg, skb);
1052 release_sock(sk);
1053 if (!skb) {
1054 if (np->rxopt.bits.rxinfo) {
1055 struct in6_pktinfo src_info;
1056 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1057 np->sticky_pktinfo.ipi6_ifindex;
1058 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1059 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1060 }
1061 if (np->rxopt.bits.rxhlim) {
1062 int hlim = np->mcast_hops;
1063 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1064 }
1065 if (np->rxopt.bits.rxtclass) {
1066 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1067
1068 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1069 }
1070 if (np->rxopt.bits.rxoinfo) {
1071 struct in6_pktinfo src_info;
1072 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1073 np->sticky_pktinfo.ipi6_ifindex;
1074 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1075 np->sticky_pktinfo.ipi6_addr;
1076 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1077 }
1078 if (np->rxopt.bits.rxohlim) {
1079 int hlim = np->mcast_hops;
1080 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1081 }
1082 if (np->rxopt.bits.rxflow) {
1083 __be32 flowinfo = np->rcv_flowinfo;
1084
1085 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1086 }
1087 }
1088 len -= msg.msg_controllen;
1089 return put_user(len, optlen);
1090 }
1091 case IPV6_MTU:
1092 {
1093 struct dst_entry *dst;
1094
1095 val = 0;
1096 rcu_read_lock();
1097 dst = __sk_dst_get(sk);
1098 if (dst)
1099 val = dst_mtu(dst);
1100 rcu_read_unlock();
1101 if (!val)
1102 return -ENOTCONN;
1103 break;
1104 }
1105
1106 case IPV6_V6ONLY:
1107 val = sk->sk_ipv6only;
1108 break;
1109
1110 case IPV6_RECVPKTINFO:
1111 val = np->rxopt.bits.rxinfo;
1112 break;
1113
1114 case IPV6_2292PKTINFO:
1115 val = np->rxopt.bits.rxoinfo;
1116 break;
1117
1118 case IPV6_RECVHOPLIMIT:
1119 val = np->rxopt.bits.rxhlim;
1120 break;
1121
1122 case IPV6_2292HOPLIMIT:
1123 val = np->rxopt.bits.rxohlim;
1124 break;
1125
1126 case IPV6_RECVRTHDR:
1127 val = np->rxopt.bits.srcrt;
1128 break;
1129
1130 case IPV6_2292RTHDR:
1131 val = np->rxopt.bits.osrcrt;
1132 break;
1133
1134 case IPV6_HOPOPTS:
1135 case IPV6_RTHDRDSTOPTS:
1136 case IPV6_RTHDR:
1137 case IPV6_DSTOPTS:
1138 {
1139 struct ipv6_txoptions *opt;
1140
1141 lock_sock(sk);
1142 opt = rcu_dereference_protected(np->opt,
1143 lockdep_sock_is_held(sk));
1144 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1145 release_sock(sk);
1146 /* check if ipv6_getsockopt_sticky() returns err code */
1147 if (len < 0)
1148 return len;
1149 return put_user(len, optlen);
1150 }
1151
1152 case IPV6_RECVHOPOPTS:
1153 val = np->rxopt.bits.hopopts;
1154 break;
1155
1156 case IPV6_2292HOPOPTS:
1157 val = np->rxopt.bits.ohopopts;
1158 break;
1159
1160 case IPV6_RECVDSTOPTS:
1161 val = np->rxopt.bits.dstopts;
1162 break;
1163
1164 case IPV6_2292DSTOPTS:
1165 val = np->rxopt.bits.odstopts;
1166 break;
1167
1168 case IPV6_TCLASS:
1169 val = np->tclass;
1170 break;
1171
1172 case IPV6_RECVTCLASS:
1173 val = np->rxopt.bits.rxtclass;
1174 break;
1175
1176 case IPV6_FLOWINFO:
1177 val = np->rxopt.bits.rxflow;
1178 break;
1179
1180 case IPV6_RECVPATHMTU:
1181 val = np->rxopt.bits.rxpmtu;
1182 break;
1183
1184 case IPV6_PATHMTU:
1185 {
1186 struct dst_entry *dst;
1187 struct ip6_mtuinfo mtuinfo;
1188
1189 if (len < sizeof(mtuinfo))
1190 return -EINVAL;
1191
1192 len = sizeof(mtuinfo);
1193 memset(&mtuinfo, 0, sizeof(mtuinfo));
1194
1195 rcu_read_lock();
1196 dst = __sk_dst_get(sk);
1197 if (dst)
1198 mtuinfo.ip6m_mtu = dst_mtu(dst);
1199 rcu_read_unlock();
1200 if (!mtuinfo.ip6m_mtu)
1201 return -ENOTCONN;
1202
1203 if (put_user(len, optlen))
1204 return -EFAULT;
1205 if (copy_to_user(optval, &mtuinfo, len))
1206 return -EFAULT;
1207
1208 return 0;
1209 }
1210
1211 case IPV6_TRANSPARENT:
1212 val = inet_sk(sk)->transparent;
1213 break;
1214
1215 case IPV6_RECVORIGDSTADDR:
1216 val = np->rxopt.bits.rxorigdstaddr;
1217 break;
1218
1219 case IPV6_UNICAST_HOPS:
1220 case IPV6_MULTICAST_HOPS:
1221 {
1222 struct dst_entry *dst;
1223
1224 if (optname == IPV6_UNICAST_HOPS)
1225 val = np->hop_limit;
1226 else
1227 val = np->mcast_hops;
1228
1229 if (val < 0) {
1230 rcu_read_lock();
1231 dst = __sk_dst_get(sk);
1232 if (dst)
1233 val = ip6_dst_hoplimit(dst);
1234 rcu_read_unlock();
1235 }
1236
1237 if (val < 0)
1238 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1239 break;
1240 }
1241
1242 case IPV6_MULTICAST_LOOP:
1243 val = np->mc_loop;
1244 break;
1245
1246 case IPV6_MULTICAST_IF:
1247 val = np->mcast_oif;
1248 break;
1249
1250 case IPV6_UNICAST_IF:
1251 val = (__force int)htonl((__u32) np->ucast_oif);
1252 break;
1253
1254 case IPV6_MTU_DISCOVER:
1255 val = np->pmtudisc;
1256 break;
1257
1258 case IPV6_RECVERR:
1259 val = np->recverr;
1260 break;
1261
1262 case IPV6_FLOWINFO_SEND:
1263 val = np->sndflow;
1264 break;
1265
1266 case IPV6_FLOWLABEL_MGR:
1267 {
1268 struct in6_flowlabel_req freq;
1269 int flags;
1270
1271 if (len < sizeof(freq))
1272 return -EINVAL;
1273
1274 if (copy_from_user(&freq, optval, sizeof(freq)))
1275 return -EFAULT;
1276
1277 if (freq.flr_action != IPV6_FL_A_GET)
1278 return -EINVAL;
1279
1280 len = sizeof(freq);
1281 flags = freq.flr_flags;
1282
1283 memset(&freq, 0, sizeof(freq));
1284
1285 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1286 if (val < 0)
1287 return val;
1288
1289 if (put_user(len, optlen))
1290 return -EFAULT;
1291 if (copy_to_user(optval, &freq, len))
1292 return -EFAULT;
1293
1294 return 0;
1295 }
1296
1297 case IPV6_ADDR_PREFERENCES:
1298 val = 0;
1299
1300 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1301 val |= IPV6_PREFER_SRC_TMP;
1302 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1303 val |= IPV6_PREFER_SRC_PUBLIC;
1304 else {
1305 /* XXX: should we return system default? */
1306 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1307 }
1308
1309 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1310 val |= IPV6_PREFER_SRC_COA;
1311 else
1312 val |= IPV6_PREFER_SRC_HOME;
1313 break;
1314
1315 case IPV6_MINHOPCOUNT:
1316 val = np->min_hopcount;
1317 break;
1318
1319 case IPV6_DONTFRAG:
1320 val = np->dontfrag;
1321 break;
1322
1323 case IPV6_AUTOFLOWLABEL:
1324 val = np->autoflowlabel;
1325 break;
1326
1327 case IPV6_RECVFRAGSIZE:
1328 val = np->rxopt.bits.recvfragsize;
1329 break;
1330
1331 default:
1332 return -ENOPROTOOPT;
1333 }
1334 len = min_t(unsigned int, sizeof(int), len);
1335 if (put_user(len, optlen))
1336 return -EFAULT;
1337 if (copy_to_user(optval, &val, len))
1338 return -EFAULT;
1339 return 0;
1340}
1341
1342int ipv6_getsockopt(struct sock *sk, int level, int optname,
1343 char __user *optval, int __user *optlen)
1344{
1345 int err;
1346
1347 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1348 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1349
1350 if (level != SOL_IPV6)
1351 return -ENOPROTOOPT;
1352
1353 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1354#ifdef CONFIG_NETFILTER
1355 /* we need to exclude all possible ENOPROTOOPTs except default case */
1356 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1357 int len;
1358
1359 if (get_user(len, optlen))
1360 return -EFAULT;
1361
1362 lock_sock(sk);
1363 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1364 &len);
1365 release_sock(sk);
1366 if (err >= 0)
1367 err = put_user(len, optlen);
1368 }
1369#endif
1370 return err;
1371}
1372EXPORT_SYMBOL(ipv6_getsockopt);
1373
1374#ifdef CONFIG_COMPAT
1375int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1376 char __user *optval, int __user *optlen)
1377{
1378 int err;
1379
1380 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1381 if (udp_prot.compat_getsockopt != NULL)
1382 return udp_prot.compat_getsockopt(sk, level, optname,
1383 optval, optlen);
1384 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1385 }
1386
1387 if (level != SOL_IPV6)
1388 return -ENOPROTOOPT;
1389
1390 if (optname == MCAST_MSFILTER)
1391 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1392 ipv6_getsockopt);
1393
1394 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1395 MSG_CMSG_COMPAT);
1396#ifdef CONFIG_NETFILTER
1397 /* we need to exclude all possible ENOPROTOOPTs except default case */
1398 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1399 int len;
1400
1401 if (get_user(len, optlen))
1402 return -EFAULT;
1403
1404 lock_sock(sk);
1405 err = compat_nf_getsockopt(sk, PF_INET6,
1406 optname, optval, &len);
1407 release_sock(sk);
1408 if (err >= 0)
1409 err = put_user(len, optlen);
1410 }
1411#endif
1412 return err;
1413}
1414EXPORT_SYMBOL(compat_ipv6_getsockopt);
1415#endif
1416