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