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riscv: select ARCH_HAS_STRICT_KERNEL_RWX only if MMU
[thirdparty/linux.git] / net / ipv6 / ipv6_sockglue.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
36
37 #include <net/sock.h>
38 #include <net/snmp.h>
39 #include <net/ipv6.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
46 #include <net/tcp.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/xfrm.h>
50 #include <net/compat.h>
51 #include <net/seg6.h>
52
53 #include <linux/uaccess.h>
54
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
57
58 int ip6_ra_control(struct sock *sk, int sel)
59 {
60 struct ip6_ra_chain *ra, *new_ra, **rap;
61
62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
64 return -ENOPROTOOPT;
65
66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67 if (sel >= 0 && !new_ra)
68 return -ENOMEM;
69
70 write_lock_bh(&ip6_ra_lock);
71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
72 if (ra->sk == sk) {
73 if (sel >= 0) {
74 write_unlock_bh(&ip6_ra_lock);
75 kfree(new_ra);
76 return -EADDRINUSE;
77 }
78
79 *rap = ra->next;
80 write_unlock_bh(&ip6_ra_lock);
81
82 sock_put(sk);
83 kfree(ra);
84 return 0;
85 }
86 }
87 if (!new_ra) {
88 write_unlock_bh(&ip6_ra_lock);
89 return -ENOBUFS;
90 }
91 new_ra->sk = sk;
92 new_ra->sel = sel;
93 new_ra->next = ra;
94 *rap = new_ra;
95 sock_hold(sk);
96 write_unlock_bh(&ip6_ra_lock);
97 return 0;
98 }
99
100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101 struct ipv6_txoptions *opt)
102 {
103 if (inet_sk(sk)->is_icsk) {
104 if (opt &&
105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107 struct inet_connection_sock *icsk = inet_csk(sk);
108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
110 }
111 }
112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
113 opt);
114 sk_dst_reset(sk);
115
116 return opt;
117 }
118
119 static bool setsockopt_needs_rtnl(int optname)
120 {
121 switch (optname) {
122 case IPV6_ADDRFORM:
123 case IPV6_ADD_MEMBERSHIP:
124 case IPV6_DROP_MEMBERSHIP:
125 case IPV6_JOIN_ANYCAST:
126 case IPV6_LEAVE_ANYCAST:
127 case MCAST_JOIN_GROUP:
128 case MCAST_LEAVE_GROUP:
129 case MCAST_JOIN_SOURCE_GROUP:
130 case MCAST_LEAVE_SOURCE_GROUP:
131 case MCAST_BLOCK_SOURCE:
132 case MCAST_UNBLOCK_SOURCE:
133 case MCAST_MSFILTER:
134 return true;
135 }
136 return false;
137 }
138
139 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
140 char __user *optval, unsigned int optlen)
141 {
142 struct ipv6_pinfo *np = inet6_sk(sk);
143 struct net *net = sock_net(sk);
144 int val, valbool;
145 int retv = -ENOPROTOOPT;
146 bool needs_rtnl = setsockopt_needs_rtnl(optname);
147
148 if (!optval)
149 val = 0;
150 else {
151 if (optlen >= sizeof(int)) {
152 if (get_user(val, (int __user *) optval))
153 return -EFAULT;
154 } else
155 val = 0;
156 }
157
158 valbool = (val != 0);
159
160 if (ip6_mroute_opt(optname))
161 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
162
163 if (needs_rtnl)
164 rtnl_lock();
165 lock_sock(sk);
166
167 switch (optname) {
168
169 case IPV6_ADDRFORM:
170 if (optlen < sizeof(int))
171 goto e_inval;
172 if (val == PF_INET) {
173 struct ipv6_txoptions *opt;
174 struct sk_buff *pktopt;
175
176 if (sk->sk_type == SOCK_RAW)
177 break;
178
179 if (sk->sk_protocol == IPPROTO_UDP ||
180 sk->sk_protocol == IPPROTO_UDPLITE) {
181 struct udp_sock *up = udp_sk(sk);
182 if (up->pending == AF_INET6) {
183 retv = -EBUSY;
184 break;
185 }
186 } else if (sk->sk_protocol == IPPROTO_TCP) {
187 if (sk->sk_prot != &tcpv6_prot) {
188 retv = -EBUSY;
189 break;
190 }
191 break;
192 } else {
193 break;
194 }
195 if (sk->sk_state != TCP_ESTABLISHED) {
196 retv = -ENOTCONN;
197 break;
198 }
199
200 if (ipv6_only_sock(sk) ||
201 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
202 retv = -EADDRNOTAVAIL;
203 break;
204 }
205
206 fl6_free_socklist(sk);
207 __ipv6_sock_mc_close(sk);
208
209 /*
210 * Sock is moving from IPv6 to IPv4 (sk_prot), so
211 * remove it from the refcnt debug socks count in the
212 * original family...
213 */
214 sk_refcnt_debug_dec(sk);
215
216 if (sk->sk_protocol == IPPROTO_TCP) {
217 struct inet_connection_sock *icsk = inet_csk(sk);
218 local_bh_disable();
219 sock_prot_inuse_add(net, sk->sk_prot, -1);
220 sock_prot_inuse_add(net, &tcp_prot, 1);
221 local_bh_enable();
222 sk->sk_prot = &tcp_prot;
223 icsk->icsk_af_ops = &ipv4_specific;
224 sk->sk_socket->ops = &inet_stream_ops;
225 sk->sk_family = PF_INET;
226 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
227 } else {
228 struct proto *prot = &udp_prot;
229
230 if (sk->sk_protocol == IPPROTO_UDPLITE)
231 prot = &udplite_prot;
232 local_bh_disable();
233 sock_prot_inuse_add(net, sk->sk_prot, -1);
234 sock_prot_inuse_add(net, prot, 1);
235 local_bh_enable();
236 sk->sk_prot = prot;
237 sk->sk_socket->ops = &inet_dgram_ops;
238 sk->sk_family = PF_INET;
239 }
240 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
241 NULL);
242 if (opt) {
243 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
244 txopt_put(opt);
245 }
246 pktopt = xchg(&np->pktoptions, NULL);
247 kfree_skb(pktopt);
248
249 /*
250 * ... and add it to the refcnt debug socks count
251 * in the new family. -acme
252 */
253 sk_refcnt_debug_inc(sk);
254 module_put(THIS_MODULE);
255 retv = 0;
256 break;
257 }
258 goto e_inval;
259
260 case IPV6_V6ONLY:
261 if (optlen < sizeof(int) ||
262 inet_sk(sk)->inet_num)
263 goto e_inval;
264 sk->sk_ipv6only = valbool;
265 retv = 0;
266 break;
267
268 case IPV6_RECVPKTINFO:
269 if (optlen < sizeof(int))
270 goto e_inval;
271 np->rxopt.bits.rxinfo = valbool;
272 retv = 0;
273 break;
274
275 case IPV6_2292PKTINFO:
276 if (optlen < sizeof(int))
277 goto e_inval;
278 np->rxopt.bits.rxoinfo = valbool;
279 retv = 0;
280 break;
281
282 case IPV6_RECVHOPLIMIT:
283 if (optlen < sizeof(int))
284 goto e_inval;
285 np->rxopt.bits.rxhlim = valbool;
286 retv = 0;
287 break;
288
289 case IPV6_2292HOPLIMIT:
290 if (optlen < sizeof(int))
291 goto e_inval;
292 np->rxopt.bits.rxohlim = valbool;
293 retv = 0;
294 break;
295
296 case IPV6_RECVRTHDR:
297 if (optlen < sizeof(int))
298 goto e_inval;
299 np->rxopt.bits.srcrt = valbool;
300 retv = 0;
301 break;
302
303 case IPV6_2292RTHDR:
304 if (optlen < sizeof(int))
305 goto e_inval;
306 np->rxopt.bits.osrcrt = valbool;
307 retv = 0;
308 break;
309
310 case IPV6_RECVHOPOPTS:
311 if (optlen < sizeof(int))
312 goto e_inval;
313 np->rxopt.bits.hopopts = valbool;
314 retv = 0;
315 break;
316
317 case IPV6_2292HOPOPTS:
318 if (optlen < sizeof(int))
319 goto e_inval;
320 np->rxopt.bits.ohopopts = valbool;
321 retv = 0;
322 break;
323
324 case IPV6_RECVDSTOPTS:
325 if (optlen < sizeof(int))
326 goto e_inval;
327 np->rxopt.bits.dstopts = valbool;
328 retv = 0;
329 break;
330
331 case IPV6_2292DSTOPTS:
332 if (optlen < sizeof(int))
333 goto e_inval;
334 np->rxopt.bits.odstopts = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_TCLASS:
339 if (optlen < sizeof(int))
340 goto e_inval;
341 if (val < -1 || val > 0xff)
342 goto e_inval;
343 /* RFC 3542, 6.5: default traffic class of 0x0 */
344 if (val == -1)
345 val = 0;
346 np->tclass = val;
347 retv = 0;
348 break;
349
350 case IPV6_RECVTCLASS:
351 if (optlen < sizeof(int))
352 goto e_inval;
353 np->rxopt.bits.rxtclass = valbool;
354 retv = 0;
355 break;
356
357 case IPV6_FLOWINFO:
358 if (optlen < sizeof(int))
359 goto e_inval;
360 np->rxopt.bits.rxflow = valbool;
361 retv = 0;
362 break;
363
364 case IPV6_RECVPATHMTU:
365 if (optlen < sizeof(int))
366 goto e_inval;
367 np->rxopt.bits.rxpmtu = valbool;
368 retv = 0;
369 break;
370
371 case IPV6_TRANSPARENT:
372 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
373 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
374 retv = -EPERM;
375 break;
376 }
377 if (optlen < sizeof(int))
378 goto e_inval;
379 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
380 inet_sk(sk)->transparent = valbool;
381 retv = 0;
382 break;
383
384 case IPV6_FREEBIND:
385 if (optlen < sizeof(int))
386 goto e_inval;
387 /* we also don't have a separate freebind bit for IPV6 */
388 inet_sk(sk)->freebind = valbool;
389 retv = 0;
390 break;
391
392 case IPV6_RECVORIGDSTADDR:
393 if (optlen < sizeof(int))
394 goto e_inval;
395 np->rxopt.bits.rxorigdstaddr = valbool;
396 retv = 0;
397 break;
398
399 case IPV6_HOPOPTS:
400 case IPV6_RTHDRDSTOPTS:
401 case IPV6_RTHDR:
402 case IPV6_DSTOPTS:
403 {
404 struct ipv6_txoptions *opt;
405 struct ipv6_opt_hdr *new = NULL;
406
407 /* hop-by-hop / destination options are privileged option */
408 retv = -EPERM;
409 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
410 break;
411
412 /* remove any sticky options header with a zero option
413 * length, per RFC3542.
414 */
415 if (optlen == 0)
416 optval = NULL;
417 else if (!optval)
418 goto e_inval;
419 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
420 optlen & 0x7 || optlen > 8 * 255)
421 goto e_inval;
422 else {
423 new = memdup_user(optval, optlen);
424 if (IS_ERR(new)) {
425 retv = PTR_ERR(new);
426 break;
427 }
428 if (unlikely(ipv6_optlen(new) > optlen)) {
429 kfree(new);
430 goto e_inval;
431 }
432 }
433
434 opt = rcu_dereference_protected(np->opt,
435 lockdep_sock_is_held(sk));
436 opt = ipv6_renew_options(sk, opt, optname, new);
437 kfree(new);
438 if (IS_ERR(opt)) {
439 retv = PTR_ERR(opt);
440 break;
441 }
442
443 /* routing header option needs extra check */
444 retv = -EINVAL;
445 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
446 struct ipv6_rt_hdr *rthdr = opt->srcrt;
447 switch (rthdr->type) {
448 #if IS_ENABLED(CONFIG_IPV6_MIP6)
449 case IPV6_SRCRT_TYPE_2:
450 if (rthdr->hdrlen != 2 ||
451 rthdr->segments_left != 1)
452 goto sticky_done;
453
454 break;
455 #endif
456 case IPV6_SRCRT_TYPE_4:
457 {
458 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
459 opt->srcrt;
460
461 if (!seg6_validate_srh(srh, optlen))
462 goto sticky_done;
463 break;
464 }
465 default:
466 goto sticky_done;
467 }
468 }
469
470 retv = 0;
471 opt = ipv6_update_options(sk, opt);
472 sticky_done:
473 if (opt) {
474 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
475 txopt_put(opt);
476 }
477 break;
478 }
479
480 case IPV6_PKTINFO:
481 {
482 struct in6_pktinfo pkt;
483
484 if (optlen == 0)
485 goto e_inval;
486 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
487 goto e_inval;
488
489 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
490 retv = -EFAULT;
491 break;
492 }
493 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
494 goto e_inval;
495
496 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
497 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
498 retv = 0;
499 break;
500 }
501
502 case IPV6_2292PKTOPTIONS:
503 {
504 struct ipv6_txoptions *opt = NULL;
505 struct msghdr msg;
506 struct flowi6 fl6;
507 struct ipcm6_cookie ipc6;
508
509 memset(&fl6, 0, sizeof(fl6));
510 fl6.flowi6_oif = sk->sk_bound_dev_if;
511 fl6.flowi6_mark = sk->sk_mark;
512
513 if (optlen == 0)
514 goto update;
515
516 /* 1K is probably excessive
517 * 1K is surely not enough, 2K per standard header is 16K.
518 */
519 retv = -EINVAL;
520 if (optlen > 64*1024)
521 break;
522
523 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
524 retv = -ENOBUFS;
525 if (!opt)
526 break;
527
528 memset(opt, 0, sizeof(*opt));
529 refcount_set(&opt->refcnt, 1);
530 opt->tot_len = sizeof(*opt) + optlen;
531 retv = -EFAULT;
532 if (copy_from_user(opt+1, optval, optlen))
533 goto done;
534
535 msg.msg_controllen = optlen;
536 msg.msg_control = (void *)(opt+1);
537 ipc6.opt = opt;
538
539 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
540 if (retv)
541 goto done;
542 update:
543 retv = 0;
544 opt = ipv6_update_options(sk, opt);
545 done:
546 if (opt) {
547 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
548 txopt_put(opt);
549 }
550 break;
551 }
552 case IPV6_UNICAST_HOPS:
553 if (optlen < sizeof(int))
554 goto e_inval;
555 if (val > 255 || val < -1)
556 goto e_inval;
557 np->hop_limit = val;
558 retv = 0;
559 break;
560
561 case IPV6_MULTICAST_HOPS:
562 if (sk->sk_type == SOCK_STREAM)
563 break;
564 if (optlen < sizeof(int))
565 goto e_inval;
566 if (val > 255 || val < -1)
567 goto e_inval;
568 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
569 retv = 0;
570 break;
571
572 case IPV6_MULTICAST_LOOP:
573 if (optlen < sizeof(int))
574 goto e_inval;
575 if (val != valbool)
576 goto e_inval;
577 np->mc_loop = valbool;
578 retv = 0;
579 break;
580
581 case IPV6_UNICAST_IF:
582 {
583 struct net_device *dev = NULL;
584 int ifindex;
585
586 if (optlen != sizeof(int))
587 goto e_inval;
588
589 ifindex = (__force int)ntohl((__force __be32)val);
590 if (ifindex == 0) {
591 np->ucast_oif = 0;
592 retv = 0;
593 break;
594 }
595
596 dev = dev_get_by_index(net, ifindex);
597 retv = -EADDRNOTAVAIL;
598 if (!dev)
599 break;
600 dev_put(dev);
601
602 retv = -EINVAL;
603 if (sk->sk_bound_dev_if)
604 break;
605
606 np->ucast_oif = ifindex;
607 retv = 0;
608 break;
609 }
610
611 case IPV6_MULTICAST_IF:
612 if (sk->sk_type == SOCK_STREAM)
613 break;
614 if (optlen < sizeof(int))
615 goto e_inval;
616
617 if (val) {
618 struct net_device *dev;
619 int midx;
620
621 rcu_read_lock();
622
623 dev = dev_get_by_index_rcu(net, val);
624 if (!dev) {
625 rcu_read_unlock();
626 retv = -ENODEV;
627 break;
628 }
629 midx = l3mdev_master_ifindex_rcu(dev);
630
631 rcu_read_unlock();
632
633 if (sk->sk_bound_dev_if &&
634 sk->sk_bound_dev_if != val &&
635 (!midx || midx != sk->sk_bound_dev_if))
636 goto e_inval;
637 }
638 np->mcast_oif = val;
639 retv = 0;
640 break;
641 case IPV6_ADD_MEMBERSHIP:
642 case IPV6_DROP_MEMBERSHIP:
643 {
644 struct ipv6_mreq mreq;
645
646 if (optlen < sizeof(struct ipv6_mreq))
647 goto e_inval;
648
649 retv = -EPROTO;
650 if (inet_sk(sk)->is_icsk)
651 break;
652
653 retv = -EFAULT;
654 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
655 break;
656
657 if (optname == IPV6_ADD_MEMBERSHIP)
658 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
659 else
660 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
661 break;
662 }
663 case IPV6_JOIN_ANYCAST:
664 case IPV6_LEAVE_ANYCAST:
665 {
666 struct ipv6_mreq mreq;
667
668 if (optlen < sizeof(struct ipv6_mreq))
669 goto e_inval;
670
671 retv = -EFAULT;
672 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
673 break;
674
675 if (optname == IPV6_JOIN_ANYCAST)
676 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
677 else
678 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
679 break;
680 }
681 case IPV6_MULTICAST_ALL:
682 if (optlen < sizeof(int))
683 goto e_inval;
684 np->mc_all = valbool;
685 retv = 0;
686 break;
687
688 case MCAST_JOIN_GROUP:
689 case MCAST_LEAVE_GROUP:
690 {
691 struct group_req greq;
692 struct sockaddr_in6 *psin6;
693
694 if (optlen < sizeof(struct group_req))
695 goto e_inval;
696
697 retv = -EFAULT;
698 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
699 break;
700 if (greq.gr_group.ss_family != AF_INET6) {
701 retv = -EADDRNOTAVAIL;
702 break;
703 }
704 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
705 if (optname == MCAST_JOIN_GROUP)
706 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
707 &psin6->sin6_addr);
708 else
709 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
710 &psin6->sin6_addr);
711 break;
712 }
713 case MCAST_JOIN_SOURCE_GROUP:
714 case MCAST_LEAVE_SOURCE_GROUP:
715 case MCAST_BLOCK_SOURCE:
716 case MCAST_UNBLOCK_SOURCE:
717 {
718 struct group_source_req greqs;
719 int omode, add;
720
721 if (optlen < sizeof(struct group_source_req))
722 goto e_inval;
723 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
724 retv = -EFAULT;
725 break;
726 }
727 if (greqs.gsr_group.ss_family != AF_INET6 ||
728 greqs.gsr_source.ss_family != AF_INET6) {
729 retv = -EADDRNOTAVAIL;
730 break;
731 }
732 if (optname == MCAST_BLOCK_SOURCE) {
733 omode = MCAST_EXCLUDE;
734 add = 1;
735 } else if (optname == MCAST_UNBLOCK_SOURCE) {
736 omode = MCAST_EXCLUDE;
737 add = 0;
738 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
739 struct sockaddr_in6 *psin6;
740
741 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
742 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
743 &psin6->sin6_addr,
744 MCAST_INCLUDE);
745 /* prior join w/ different source is ok */
746 if (retv && retv != -EADDRINUSE)
747 break;
748 omode = MCAST_INCLUDE;
749 add = 1;
750 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
751 omode = MCAST_INCLUDE;
752 add = 0;
753 }
754 retv = ip6_mc_source(add, omode, sk, &greqs);
755 break;
756 }
757 case MCAST_MSFILTER:
758 {
759 struct group_filter *gsf;
760
761 if (optlen < GROUP_FILTER_SIZE(0))
762 goto e_inval;
763 if (optlen > sysctl_optmem_max) {
764 retv = -ENOBUFS;
765 break;
766 }
767 gsf = memdup_user(optval, optlen);
768 if (IS_ERR(gsf)) {
769 retv = PTR_ERR(gsf);
770 break;
771 }
772 /* numsrc >= (4G-140)/128 overflow in 32 bits */
773 if (gsf->gf_numsrc >= 0x1ffffffU ||
774 gsf->gf_numsrc > sysctl_mld_max_msf) {
775 kfree(gsf);
776 retv = -ENOBUFS;
777 break;
778 }
779 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
780 kfree(gsf);
781 retv = -EINVAL;
782 break;
783 }
784 retv = ip6_mc_msfilter(sk, gsf);
785 kfree(gsf);
786
787 break;
788 }
789 case IPV6_ROUTER_ALERT:
790 if (optlen < sizeof(int))
791 goto e_inval;
792 retv = ip6_ra_control(sk, val);
793 break;
794 case IPV6_ROUTER_ALERT_ISOLATE:
795 if (optlen < sizeof(int))
796 goto e_inval;
797 np->rtalert_isolate = valbool;
798 retv = 0;
799 break;
800 case IPV6_MTU_DISCOVER:
801 if (optlen < sizeof(int))
802 goto e_inval;
803 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
804 goto e_inval;
805 np->pmtudisc = val;
806 retv = 0;
807 break;
808 case IPV6_MTU:
809 if (optlen < sizeof(int))
810 goto e_inval;
811 if (val && val < IPV6_MIN_MTU)
812 goto e_inval;
813 np->frag_size = val;
814 retv = 0;
815 break;
816 case IPV6_RECVERR:
817 if (optlen < sizeof(int))
818 goto e_inval;
819 np->recverr = valbool;
820 if (!val)
821 skb_queue_purge(&sk->sk_error_queue);
822 retv = 0;
823 break;
824 case IPV6_FLOWINFO_SEND:
825 if (optlen < sizeof(int))
826 goto e_inval;
827 np->sndflow = valbool;
828 retv = 0;
829 break;
830 case IPV6_FLOWLABEL_MGR:
831 retv = ipv6_flowlabel_opt(sk, optval, optlen);
832 break;
833 case IPV6_IPSEC_POLICY:
834 case IPV6_XFRM_POLICY:
835 retv = -EPERM;
836 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
837 break;
838 retv = xfrm_user_policy(sk, optname, optval, optlen);
839 break;
840
841 case IPV6_ADDR_PREFERENCES:
842 {
843 unsigned int pref = 0;
844 unsigned int prefmask = ~0;
845
846 if (optlen < sizeof(int))
847 goto e_inval;
848
849 retv = -EINVAL;
850
851 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
852 switch (val & (IPV6_PREFER_SRC_PUBLIC|
853 IPV6_PREFER_SRC_TMP|
854 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
855 case IPV6_PREFER_SRC_PUBLIC:
856 pref |= IPV6_PREFER_SRC_PUBLIC;
857 break;
858 case IPV6_PREFER_SRC_TMP:
859 pref |= IPV6_PREFER_SRC_TMP;
860 break;
861 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
862 break;
863 case 0:
864 goto pref_skip_pubtmp;
865 default:
866 goto e_inval;
867 }
868
869 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
870 IPV6_PREFER_SRC_TMP);
871 pref_skip_pubtmp:
872
873 /* check HOME/COA conflicts */
874 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
875 case IPV6_PREFER_SRC_HOME:
876 break;
877 case IPV6_PREFER_SRC_COA:
878 pref |= IPV6_PREFER_SRC_COA;
879 case 0:
880 goto pref_skip_coa;
881 default:
882 goto e_inval;
883 }
884
885 prefmask &= ~IPV6_PREFER_SRC_COA;
886 pref_skip_coa:
887
888 /* check CGA/NONCGA conflicts */
889 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
890 case IPV6_PREFER_SRC_CGA:
891 case IPV6_PREFER_SRC_NONCGA:
892 case 0:
893 break;
894 default:
895 goto e_inval;
896 }
897
898 np->srcprefs = (np->srcprefs & prefmask) | pref;
899 retv = 0;
900
901 break;
902 }
903 case IPV6_MINHOPCOUNT:
904 if (optlen < sizeof(int))
905 goto e_inval;
906 if (val < 0 || val > 255)
907 goto e_inval;
908 np->min_hopcount = val;
909 retv = 0;
910 break;
911 case IPV6_DONTFRAG:
912 np->dontfrag = valbool;
913 retv = 0;
914 break;
915 case IPV6_AUTOFLOWLABEL:
916 np->autoflowlabel = valbool;
917 np->autoflowlabel_set = 1;
918 retv = 0;
919 break;
920 case IPV6_RECVFRAGSIZE:
921 np->rxopt.bits.recvfragsize = valbool;
922 retv = 0;
923 break;
924 }
925
926 release_sock(sk);
927 if (needs_rtnl)
928 rtnl_unlock();
929
930 return retv;
931
932 e_inval:
933 release_sock(sk);
934 if (needs_rtnl)
935 rtnl_unlock();
936 return -EINVAL;
937 }
938
939 int ipv6_setsockopt(struct sock *sk, int level, int optname,
940 char __user *optval, unsigned int optlen)
941 {
942 int err;
943
944 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
945 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
946
947 if (level != SOL_IPV6)
948 return -ENOPROTOOPT;
949
950 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
951 #ifdef CONFIG_NETFILTER
952 /* we need to exclude all possible ENOPROTOOPTs except default case */
953 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
954 optname != IPV6_XFRM_POLICY)
955 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
956 #endif
957 return err;
958 }
959 EXPORT_SYMBOL(ipv6_setsockopt);
960
961 #ifdef CONFIG_COMPAT
962 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
963 char __user *optval, unsigned int optlen)
964 {
965 int err;
966
967 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
968 if (udp_prot.compat_setsockopt != NULL)
969 return udp_prot.compat_setsockopt(sk, level, optname,
970 optval, optlen);
971 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
972 }
973
974 if (level != SOL_IPV6)
975 return -ENOPROTOOPT;
976
977 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
978 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
979 ipv6_setsockopt);
980
981 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
982 #ifdef CONFIG_NETFILTER
983 /* we need to exclude all possible ENOPROTOOPTs except default case */
984 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
985 optname != IPV6_XFRM_POLICY)
986 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
987 optlen);
988 #endif
989 return err;
990 }
991 EXPORT_SYMBOL(compat_ipv6_setsockopt);
992 #endif
993
994 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
995 int optname, char __user *optval, int len)
996 {
997 struct ipv6_opt_hdr *hdr;
998
999 if (!opt)
1000 return 0;
1001
1002 switch (optname) {
1003 case IPV6_HOPOPTS:
1004 hdr = opt->hopopt;
1005 break;
1006 case IPV6_RTHDRDSTOPTS:
1007 hdr = opt->dst0opt;
1008 break;
1009 case IPV6_RTHDR:
1010 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1011 break;
1012 case IPV6_DSTOPTS:
1013 hdr = opt->dst1opt;
1014 break;
1015 default:
1016 return -EINVAL; /* should not happen */
1017 }
1018
1019 if (!hdr)
1020 return 0;
1021
1022 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1023 if (copy_to_user(optval, hdr, len))
1024 return -EFAULT;
1025 return len;
1026 }
1027
1028 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1029 char __user *optval, int __user *optlen, unsigned int flags)
1030 {
1031 struct ipv6_pinfo *np = inet6_sk(sk);
1032 int len;
1033 int val;
1034
1035 if (ip6_mroute_opt(optname))
1036 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1037
1038 if (get_user(len, optlen))
1039 return -EFAULT;
1040 switch (optname) {
1041 case IPV6_ADDRFORM:
1042 if (sk->sk_protocol != IPPROTO_UDP &&
1043 sk->sk_protocol != IPPROTO_UDPLITE &&
1044 sk->sk_protocol != IPPROTO_TCP)
1045 return -ENOPROTOOPT;
1046 if (sk->sk_state != TCP_ESTABLISHED)
1047 return -ENOTCONN;
1048 val = sk->sk_family;
1049 break;
1050 case MCAST_MSFILTER:
1051 {
1052 struct group_filter gsf;
1053 int err;
1054
1055 if (len < GROUP_FILTER_SIZE(0))
1056 return -EINVAL;
1057 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1058 return -EFAULT;
1059 if (gsf.gf_group.ss_family != AF_INET6)
1060 return -EADDRNOTAVAIL;
1061 lock_sock(sk);
1062 err = ip6_mc_msfget(sk, &gsf,
1063 (struct group_filter __user *)optval, optlen);
1064 release_sock(sk);
1065 return err;
1066 }
1067
1068 case IPV6_2292PKTOPTIONS:
1069 {
1070 struct msghdr msg;
1071 struct sk_buff *skb;
1072
1073 if (sk->sk_type != SOCK_STREAM)
1074 return -ENOPROTOOPT;
1075
1076 msg.msg_control = optval;
1077 msg.msg_controllen = len;
1078 msg.msg_flags = flags;
1079
1080 lock_sock(sk);
1081 skb = np->pktoptions;
1082 if (skb)
1083 ip6_datagram_recv_ctl(sk, &msg, skb);
1084 release_sock(sk);
1085 if (!skb) {
1086 if (np->rxopt.bits.rxinfo) {
1087 struct in6_pktinfo src_info;
1088 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1089 np->sticky_pktinfo.ipi6_ifindex;
1090 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1091 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1092 }
1093 if (np->rxopt.bits.rxhlim) {
1094 int hlim = np->mcast_hops;
1095 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1096 }
1097 if (np->rxopt.bits.rxtclass) {
1098 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1099
1100 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1101 }
1102 if (np->rxopt.bits.rxoinfo) {
1103 struct in6_pktinfo src_info;
1104 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1105 np->sticky_pktinfo.ipi6_ifindex;
1106 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1107 np->sticky_pktinfo.ipi6_addr;
1108 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1109 }
1110 if (np->rxopt.bits.rxohlim) {
1111 int hlim = np->mcast_hops;
1112 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1113 }
1114 if (np->rxopt.bits.rxflow) {
1115 __be32 flowinfo = np->rcv_flowinfo;
1116
1117 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1118 }
1119 }
1120 len -= msg.msg_controllen;
1121 return put_user(len, optlen);
1122 }
1123 case IPV6_MTU:
1124 {
1125 struct dst_entry *dst;
1126
1127 val = 0;
1128 rcu_read_lock();
1129 dst = __sk_dst_get(sk);
1130 if (dst)
1131 val = dst_mtu(dst);
1132 rcu_read_unlock();
1133 if (!val)
1134 return -ENOTCONN;
1135 break;
1136 }
1137
1138 case IPV6_V6ONLY:
1139 val = sk->sk_ipv6only;
1140 break;
1141
1142 case IPV6_RECVPKTINFO:
1143 val = np->rxopt.bits.rxinfo;
1144 break;
1145
1146 case IPV6_2292PKTINFO:
1147 val = np->rxopt.bits.rxoinfo;
1148 break;
1149
1150 case IPV6_RECVHOPLIMIT:
1151 val = np->rxopt.bits.rxhlim;
1152 break;
1153
1154 case IPV6_2292HOPLIMIT:
1155 val = np->rxopt.bits.rxohlim;
1156 break;
1157
1158 case IPV6_RECVRTHDR:
1159 val = np->rxopt.bits.srcrt;
1160 break;
1161
1162 case IPV6_2292RTHDR:
1163 val = np->rxopt.bits.osrcrt;
1164 break;
1165
1166 case IPV6_HOPOPTS:
1167 case IPV6_RTHDRDSTOPTS:
1168 case IPV6_RTHDR:
1169 case IPV6_DSTOPTS:
1170 {
1171 struct ipv6_txoptions *opt;
1172
1173 lock_sock(sk);
1174 opt = rcu_dereference_protected(np->opt,
1175 lockdep_sock_is_held(sk));
1176 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1177 release_sock(sk);
1178 /* check if ipv6_getsockopt_sticky() returns err code */
1179 if (len < 0)
1180 return len;
1181 return put_user(len, optlen);
1182 }
1183
1184 case IPV6_RECVHOPOPTS:
1185 val = np->rxopt.bits.hopopts;
1186 break;
1187
1188 case IPV6_2292HOPOPTS:
1189 val = np->rxopt.bits.ohopopts;
1190 break;
1191
1192 case IPV6_RECVDSTOPTS:
1193 val = np->rxopt.bits.dstopts;
1194 break;
1195
1196 case IPV6_2292DSTOPTS:
1197 val = np->rxopt.bits.odstopts;
1198 break;
1199
1200 case IPV6_TCLASS:
1201 val = np->tclass;
1202 break;
1203
1204 case IPV6_RECVTCLASS:
1205 val = np->rxopt.bits.rxtclass;
1206 break;
1207
1208 case IPV6_FLOWINFO:
1209 val = np->rxopt.bits.rxflow;
1210 break;
1211
1212 case IPV6_RECVPATHMTU:
1213 val = np->rxopt.bits.rxpmtu;
1214 break;
1215
1216 case IPV6_PATHMTU:
1217 {
1218 struct dst_entry *dst;
1219 struct ip6_mtuinfo mtuinfo;
1220
1221 if (len < sizeof(mtuinfo))
1222 return -EINVAL;
1223
1224 len = sizeof(mtuinfo);
1225 memset(&mtuinfo, 0, sizeof(mtuinfo));
1226
1227 rcu_read_lock();
1228 dst = __sk_dst_get(sk);
1229 if (dst)
1230 mtuinfo.ip6m_mtu = dst_mtu(dst);
1231 rcu_read_unlock();
1232 if (!mtuinfo.ip6m_mtu)
1233 return -ENOTCONN;
1234
1235 if (put_user(len, optlen))
1236 return -EFAULT;
1237 if (copy_to_user(optval, &mtuinfo, len))
1238 return -EFAULT;
1239
1240 return 0;
1241 }
1242
1243 case IPV6_TRANSPARENT:
1244 val = inet_sk(sk)->transparent;
1245 break;
1246
1247 case IPV6_FREEBIND:
1248 val = inet_sk(sk)->freebind;
1249 break;
1250
1251 case IPV6_RECVORIGDSTADDR:
1252 val = np->rxopt.bits.rxorigdstaddr;
1253 break;
1254
1255 case IPV6_UNICAST_HOPS:
1256 case IPV6_MULTICAST_HOPS:
1257 {
1258 struct dst_entry *dst;
1259
1260 if (optname == IPV6_UNICAST_HOPS)
1261 val = np->hop_limit;
1262 else
1263 val = np->mcast_hops;
1264
1265 if (val < 0) {
1266 rcu_read_lock();
1267 dst = __sk_dst_get(sk);
1268 if (dst)
1269 val = ip6_dst_hoplimit(dst);
1270 rcu_read_unlock();
1271 }
1272
1273 if (val < 0)
1274 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1275 break;
1276 }
1277
1278 case IPV6_MULTICAST_LOOP:
1279 val = np->mc_loop;
1280 break;
1281
1282 case IPV6_MULTICAST_IF:
1283 val = np->mcast_oif;
1284 break;
1285
1286 case IPV6_MULTICAST_ALL:
1287 val = np->mc_all;
1288 break;
1289
1290 case IPV6_UNICAST_IF:
1291 val = (__force int)htonl((__u32) np->ucast_oif);
1292 break;
1293
1294 case IPV6_MTU_DISCOVER:
1295 val = np->pmtudisc;
1296 break;
1297
1298 case IPV6_RECVERR:
1299 val = np->recverr;
1300 break;
1301
1302 case IPV6_FLOWINFO_SEND:
1303 val = np->sndflow;
1304 break;
1305
1306 case IPV6_FLOWLABEL_MGR:
1307 {
1308 struct in6_flowlabel_req freq;
1309 int flags;
1310
1311 if (len < sizeof(freq))
1312 return -EINVAL;
1313
1314 if (copy_from_user(&freq, optval, sizeof(freq)))
1315 return -EFAULT;
1316
1317 if (freq.flr_action != IPV6_FL_A_GET)
1318 return -EINVAL;
1319
1320 len = sizeof(freq);
1321 flags = freq.flr_flags;
1322
1323 memset(&freq, 0, sizeof(freq));
1324
1325 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1326 if (val < 0)
1327 return val;
1328
1329 if (put_user(len, optlen))
1330 return -EFAULT;
1331 if (copy_to_user(optval, &freq, len))
1332 return -EFAULT;
1333
1334 return 0;
1335 }
1336
1337 case IPV6_ADDR_PREFERENCES:
1338 val = 0;
1339
1340 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1341 val |= IPV6_PREFER_SRC_TMP;
1342 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1343 val |= IPV6_PREFER_SRC_PUBLIC;
1344 else {
1345 /* XXX: should we return system default? */
1346 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1347 }
1348
1349 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1350 val |= IPV6_PREFER_SRC_COA;
1351 else
1352 val |= IPV6_PREFER_SRC_HOME;
1353 break;
1354
1355 case IPV6_MINHOPCOUNT:
1356 val = np->min_hopcount;
1357 break;
1358
1359 case IPV6_DONTFRAG:
1360 val = np->dontfrag;
1361 break;
1362
1363 case IPV6_AUTOFLOWLABEL:
1364 val = ip6_autoflowlabel(sock_net(sk), np);
1365 break;
1366
1367 case IPV6_RECVFRAGSIZE:
1368 val = np->rxopt.bits.recvfragsize;
1369 break;
1370
1371 case IPV6_ROUTER_ALERT_ISOLATE:
1372 val = np->rtalert_isolate;
1373 break;
1374
1375 default:
1376 return -ENOPROTOOPT;
1377 }
1378 len = min_t(unsigned int, sizeof(int), len);
1379 if (put_user(len, optlen))
1380 return -EFAULT;
1381 if (copy_to_user(optval, &val, len))
1382 return -EFAULT;
1383 return 0;
1384 }
1385
1386 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1387 char __user *optval, int __user *optlen)
1388 {
1389 int err;
1390
1391 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1392 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1393
1394 if (level != SOL_IPV6)
1395 return -ENOPROTOOPT;
1396
1397 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1398 #ifdef CONFIG_NETFILTER
1399 /* we need to exclude all possible ENOPROTOOPTs except default case */
1400 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1401 int len;
1402
1403 if (get_user(len, optlen))
1404 return -EFAULT;
1405
1406 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1407 if (err >= 0)
1408 err = put_user(len, optlen);
1409 }
1410 #endif
1411 return err;
1412 }
1413 EXPORT_SYMBOL(ipv6_getsockopt);
1414
1415 #ifdef CONFIG_COMPAT
1416 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1417 char __user *optval, int __user *optlen)
1418 {
1419 int err;
1420
1421 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1422 if (udp_prot.compat_getsockopt != NULL)
1423 return udp_prot.compat_getsockopt(sk, level, optname,
1424 optval, optlen);
1425 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1426 }
1427
1428 if (level != SOL_IPV6)
1429 return -ENOPROTOOPT;
1430
1431 if (optname == MCAST_MSFILTER)
1432 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1433 ipv6_getsockopt);
1434
1435 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1436 MSG_CMSG_COMPAT);
1437 #ifdef CONFIG_NETFILTER
1438 /* we need to exclude all possible ENOPROTOOPTs except default case */
1439 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1440 int len;
1441
1442 if (get_user(len, optlen))
1443 return -EFAULT;
1444
1445 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1446 if (err >= 0)
1447 err = put_user(len, optlen);
1448 }
1449 #endif
1450 return err;
1451 }
1452 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1453 #endif
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