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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
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(&np->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 (!capable(CAP_NET_ADMIN)) {
347 retv = -EPERM;
348 break;
349 }
350 if (optlen < sizeof(int))
351 goto e_inval;
352 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
353 inet_sk(sk)->transparent = valbool;
354 retv = 0;
355 break;
356
357 case IPV6_RECVORIGDSTADDR:
358 if (optlen < sizeof(int))
359 goto e_inval;
360 np->rxopt.bits.rxorigdstaddr = valbool;
361 retv = 0;
362 break;
363
364 case IPV6_HOPOPTS:
365 case IPV6_RTHDRDSTOPTS:
366 case IPV6_RTHDR:
367 case IPV6_DSTOPTS:
368 {
369 struct ipv6_txoptions *opt;
370
371 /* remove any sticky options header with a zero option
372 * length, per RFC3542.
373 */
374 if (optlen == 0)
375 optval = NULL;
376 else if (optval == NULL)
377 goto e_inval;
378 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
379 optlen & 0x7 || optlen > 8 * 255)
380 goto e_inval;
381
382 /* hop-by-hop / destination options are privileged option */
383 retv = -EPERM;
384 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
385 break;
386
387 opt = ipv6_renew_options(sk, np->opt, optname,
388 (struct ipv6_opt_hdr __user *)optval,
389 optlen);
390 if (IS_ERR(opt)) {
391 retv = PTR_ERR(opt);
392 break;
393 }
394
395 /* routing header option needs extra check */
396 retv = -EINVAL;
397 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
398 struct ipv6_rt_hdr *rthdr = opt->srcrt;
399 switch (rthdr->type) {
400#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
401 case IPV6_SRCRT_TYPE_2:
402 if (rthdr->hdrlen != 2 ||
403 rthdr->segments_left != 1)
404 goto sticky_done;
405
406 break;
407#endif
408 default:
409 goto sticky_done;
410 }
411 }
412
413 retv = 0;
414 opt = ipv6_update_options(sk, opt);
415sticky_done:
416 if (opt)
417 sock_kfree_s(sk, opt, opt->tot_len);
418 break;
419 }
420
421 case IPV6_PKTINFO:
422 {
423 struct in6_pktinfo pkt;
424
425 if (optlen == 0)
426 goto e_inval;
427 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
428 goto e_inval;
429
430 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
431 retv = -EFAULT;
432 break;
433 }
434 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
435 goto e_inval;
436
437 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
438 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
439 retv = 0;
440 break;
441 }
442
443 case IPV6_2292PKTOPTIONS:
444 {
445 struct ipv6_txoptions *opt = NULL;
446 struct msghdr msg;
447 struct flowi6 fl6;
448 int junk;
449
450 memset(&fl6, 0, sizeof(fl6));
451 fl6.flowi6_oif = sk->sk_bound_dev_if;
452 fl6.flowi6_mark = sk->sk_mark;
453
454 if (optlen == 0)
455 goto update;
456
457 /* 1K is probably excessive
458 * 1K is surely not enough, 2K per standard header is 16K.
459 */
460 retv = -EINVAL;
461 if (optlen > 64*1024)
462 break;
463
464 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
465 retv = -ENOBUFS;
466 if (opt == NULL)
467 break;
468
469 memset(opt, 0, sizeof(*opt));
470 opt->tot_len = sizeof(*opt) + optlen;
471 retv = -EFAULT;
472 if (copy_from_user(opt+1, optval, optlen))
473 goto done;
474
475 msg.msg_controllen = optlen;
476 msg.msg_control = (void*)(opt+1);
477
478 retv = datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk, &junk,
479 &junk);
480 if (retv)
481 goto done;
482update:
483 retv = 0;
484 opt = ipv6_update_options(sk, opt);
485done:
486 if (opt)
487 sock_kfree_s(sk, opt, opt->tot_len);
488 break;
489 }
490 case IPV6_UNICAST_HOPS:
491 if (optlen < sizeof(int))
492 goto e_inval;
493 if (val > 255 || val < -1)
494 goto e_inval;
495 np->hop_limit = val;
496 retv = 0;
497 break;
498
499 case IPV6_MULTICAST_HOPS:
500 if (sk->sk_type == SOCK_STREAM)
501 break;
502 if (optlen < sizeof(int))
503 goto e_inval;
504 if (val > 255 || val < -1)
505 goto e_inval;
506 np->mcast_hops = val;
507 retv = 0;
508 break;
509
510 case IPV6_MULTICAST_LOOP:
511 if (optlen < sizeof(int))
512 goto e_inval;
513 if (val != valbool)
514 goto e_inval;
515 np->mc_loop = valbool;
516 retv = 0;
517 break;
518
519 case IPV6_MULTICAST_IF:
520 if (sk->sk_type == SOCK_STREAM)
521 break;
522 if (optlen < sizeof(int))
523 goto e_inval;
524
525 if (val) {
526 struct net_device *dev;
527
528 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
529 goto e_inval;
530
531 dev = dev_get_by_index(net, val);
532 if (!dev) {
533 retv = -ENODEV;
534 break;
535 }
536 dev_put(dev);
537 }
538 np->mcast_oif = val;
539 retv = 0;
540 break;
541 case IPV6_ADD_MEMBERSHIP:
542 case IPV6_DROP_MEMBERSHIP:
543 {
544 struct ipv6_mreq mreq;
545
546 if (optlen < sizeof(struct ipv6_mreq))
547 goto e_inval;
548
549 retv = -EPROTO;
550 if (inet_sk(sk)->is_icsk)
551 break;
552
553 retv = -EFAULT;
554 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
555 break;
556
557 if (optname == IPV6_ADD_MEMBERSHIP)
558 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
559 else
560 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
561 break;
562 }
563 case IPV6_JOIN_ANYCAST:
564 case IPV6_LEAVE_ANYCAST:
565 {
566 struct ipv6_mreq mreq;
567
568 if (optlen < sizeof(struct ipv6_mreq))
569 goto e_inval;
570
571 retv = -EFAULT;
572 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
573 break;
574
575 if (optname == IPV6_JOIN_ANYCAST)
576 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
577 else
578 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
579 break;
580 }
581 case MCAST_JOIN_GROUP:
582 case MCAST_LEAVE_GROUP:
583 {
584 struct group_req greq;
585 struct sockaddr_in6 *psin6;
586
587 if (optlen < sizeof(struct group_req))
588 goto e_inval;
589
590 retv = -EFAULT;
591 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
592 break;
593 if (greq.gr_group.ss_family != AF_INET6) {
594 retv = -EADDRNOTAVAIL;
595 break;
596 }
597 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
598 if (optname == MCAST_JOIN_GROUP)
599 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
600 &psin6->sin6_addr);
601 else
602 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
603 &psin6->sin6_addr);
604 break;
605 }
606 case MCAST_JOIN_SOURCE_GROUP:
607 case MCAST_LEAVE_SOURCE_GROUP:
608 case MCAST_BLOCK_SOURCE:
609 case MCAST_UNBLOCK_SOURCE:
610 {
611 struct group_source_req greqs;
612 int omode, add;
613
614 if (optlen < sizeof(struct group_source_req))
615 goto e_inval;
616 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
617 retv = -EFAULT;
618 break;
619 }
620 if (greqs.gsr_group.ss_family != AF_INET6 ||
621 greqs.gsr_source.ss_family != AF_INET6) {
622 retv = -EADDRNOTAVAIL;
623 break;
624 }
625 if (optname == MCAST_BLOCK_SOURCE) {
626 omode = MCAST_EXCLUDE;
627 add = 1;
628 } else if (optname == MCAST_UNBLOCK_SOURCE) {
629 omode = MCAST_EXCLUDE;
630 add = 0;
631 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
632 struct sockaddr_in6 *psin6;
633
634 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
635 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
636 &psin6->sin6_addr);
637 /* prior join w/ different source is ok */
638 if (retv && retv != -EADDRINUSE)
639 break;
640 omode = MCAST_INCLUDE;
641 add = 1;
642 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
643 omode = MCAST_INCLUDE;
644 add = 0;
645 }
646 retv = ip6_mc_source(add, omode, sk, &greqs);
647 break;
648 }
649 case MCAST_MSFILTER:
650 {
651 extern int sysctl_mld_max_msf;
652 struct group_filter *gsf;
653
654 if (optlen < GROUP_FILTER_SIZE(0))
655 goto e_inval;
656 if (optlen > sysctl_optmem_max) {
657 retv = -ENOBUFS;
658 break;
659 }
660 gsf = kmalloc(optlen,GFP_KERNEL);
661 if (!gsf) {
662 retv = -ENOBUFS;
663 break;
664 }
665 retv = -EFAULT;
666 if (copy_from_user(gsf, optval, optlen)) {
667 kfree(gsf);
668 break;
669 }
670 /* numsrc >= (4G-140)/128 overflow in 32 bits */
671 if (gsf->gf_numsrc >= 0x1ffffffU ||
672 gsf->gf_numsrc > sysctl_mld_max_msf) {
673 kfree(gsf);
674 retv = -ENOBUFS;
675 break;
676 }
677 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
678 kfree(gsf);
679 retv = -EINVAL;
680 break;
681 }
682 retv = ip6_mc_msfilter(sk, gsf);
683 kfree(gsf);
684
685 break;
686 }
687 case IPV6_ROUTER_ALERT:
688 if (optlen < sizeof(int))
689 goto e_inval;
690 retv = ip6_ra_control(sk, val);
691 break;
692 case IPV6_MTU_DISCOVER:
693 if (optlen < sizeof(int))
694 goto e_inval;
695 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
696 goto e_inval;
697 np->pmtudisc = val;
698 retv = 0;
699 break;
700 case IPV6_MTU:
701 if (optlen < sizeof(int))
702 goto e_inval;
703 if (val && val < IPV6_MIN_MTU)
704 goto e_inval;
705 np->frag_size = val;
706 retv = 0;
707 break;
708 case IPV6_RECVERR:
709 if (optlen < sizeof(int))
710 goto e_inval;
711 np->recverr = valbool;
712 if (!val)
713 skb_queue_purge(&sk->sk_error_queue);
714 retv = 0;
715 break;
716 case IPV6_FLOWINFO_SEND:
717 if (optlen < sizeof(int))
718 goto e_inval;
719 np->sndflow = valbool;
720 retv = 0;
721 break;
722 case IPV6_FLOWLABEL_MGR:
723 retv = ipv6_flowlabel_opt(sk, optval, optlen);
724 break;
725 case IPV6_IPSEC_POLICY:
726 case IPV6_XFRM_POLICY:
727 retv = -EPERM;
728 if (!capable(CAP_NET_ADMIN))
729 break;
730 retv = xfrm_user_policy(sk, optname, optval, optlen);
731 break;
732
733 case IPV6_ADDR_PREFERENCES:
734 {
735 unsigned int pref = 0;
736 unsigned int prefmask = ~0;
737
738 if (optlen < sizeof(int))
739 goto e_inval;
740
741 retv = -EINVAL;
742
743 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
744 switch (val & (IPV6_PREFER_SRC_PUBLIC|
745 IPV6_PREFER_SRC_TMP|
746 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
747 case IPV6_PREFER_SRC_PUBLIC:
748 pref |= IPV6_PREFER_SRC_PUBLIC;
749 break;
750 case IPV6_PREFER_SRC_TMP:
751 pref |= IPV6_PREFER_SRC_TMP;
752 break;
753 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
754 break;
755 case 0:
756 goto pref_skip_pubtmp;
757 default:
758 goto e_inval;
759 }
760
761 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
762 IPV6_PREFER_SRC_TMP);
763pref_skip_pubtmp:
764
765 /* check HOME/COA conflicts */
766 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
767 case IPV6_PREFER_SRC_HOME:
768 break;
769 case IPV6_PREFER_SRC_COA:
770 pref |= IPV6_PREFER_SRC_COA;
771 case 0:
772 goto pref_skip_coa;
773 default:
774 goto e_inval;
775 }
776
777 prefmask &= ~IPV6_PREFER_SRC_COA;
778pref_skip_coa:
779
780 /* check CGA/NONCGA conflicts */
781 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
782 case IPV6_PREFER_SRC_CGA:
783 case IPV6_PREFER_SRC_NONCGA:
784 case 0:
785 break;
786 default:
787 goto e_inval;
788 }
789
790 np->srcprefs = (np->srcprefs & prefmask) | pref;
791 retv = 0;
792
793 break;
794 }
795 case IPV6_MINHOPCOUNT:
796 if (optlen < sizeof(int))
797 goto e_inval;
798 if (val < 0 || val > 255)
799 goto e_inval;
800 np->min_hopcount = val;
801 break;
802 case IPV6_DONTFRAG:
803 np->dontfrag = valbool;
804 retv = 0;
805 break;
806 }
807
808 release_sock(sk);
809
810 return retv;
811
812e_inval:
813 release_sock(sk);
814 return -EINVAL;
815}
816
817int ipv6_setsockopt(struct sock *sk, int level, int optname,
818 char __user *optval, unsigned int optlen)
819{
820 int err;
821
822 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
823 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
824
825 if (level != SOL_IPV6)
826 return -ENOPROTOOPT;
827
828 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
829#ifdef CONFIG_NETFILTER
830 /* we need to exclude all possible ENOPROTOOPTs except default case */
831 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
832 optname != IPV6_XFRM_POLICY) {
833 lock_sock(sk);
834 err = nf_setsockopt(sk, PF_INET6, optname, optval,
835 optlen);
836 release_sock(sk);
837 }
838#endif
839 return err;
840}
841
842EXPORT_SYMBOL(ipv6_setsockopt);
843
844#ifdef CONFIG_COMPAT
845int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
846 char __user *optval, unsigned int optlen)
847{
848 int err;
849
850 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
851 if (udp_prot.compat_setsockopt != NULL)
852 return udp_prot.compat_setsockopt(sk, level, optname,
853 optval, optlen);
854 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855 }
856
857 if (level != SOL_IPV6)
858 return -ENOPROTOOPT;
859
860 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
861 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
862 ipv6_setsockopt);
863
864 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
865#ifdef CONFIG_NETFILTER
866 /* we need to exclude all possible ENOPROTOOPTs except default case */
867 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
868 optname != IPV6_XFRM_POLICY) {
869 lock_sock(sk);
870 err = compat_nf_setsockopt(sk, PF_INET6, optname,
871 optval, optlen);
872 release_sock(sk);
873 }
874#endif
875 return err;
876}
877
878EXPORT_SYMBOL(compat_ipv6_setsockopt);
879#endif
880
881static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
882 int optname, char __user *optval, int len)
883{
884 struct ipv6_opt_hdr *hdr;
885
886 if (!opt)
887 return 0;
888
889 switch(optname) {
890 case IPV6_HOPOPTS:
891 hdr = opt->hopopt;
892 break;
893 case IPV6_RTHDRDSTOPTS:
894 hdr = opt->dst0opt;
895 break;
896 case IPV6_RTHDR:
897 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
898 break;
899 case IPV6_DSTOPTS:
900 hdr = opt->dst1opt;
901 break;
902 default:
903 return -EINVAL; /* should not happen */
904 }
905
906 if (!hdr)
907 return 0;
908
909 len = min_t(unsigned int, len, ipv6_optlen(hdr));
910 if (copy_to_user(optval, hdr, len))
911 return -EFAULT;
912 return len;
913}
914
915static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
916 char __user *optval, int __user *optlen, unsigned flags)
917{
918 struct ipv6_pinfo *np = inet6_sk(sk);
919 int len;
920 int val;
921
922 if (ip6_mroute_opt(optname))
923 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
924
925 if (get_user(len, optlen))
926 return -EFAULT;
927 switch (optname) {
928 case IPV6_ADDRFORM:
929 if (sk->sk_protocol != IPPROTO_UDP &&
930 sk->sk_protocol != IPPROTO_UDPLITE &&
931 sk->sk_protocol != IPPROTO_TCP)
932 return -ENOPROTOOPT;
933 if (sk->sk_state != TCP_ESTABLISHED)
934 return -ENOTCONN;
935 val = sk->sk_family;
936 break;
937 case MCAST_MSFILTER:
938 {
939 struct group_filter gsf;
940 int err;
941
942 if (len < GROUP_FILTER_SIZE(0))
943 return -EINVAL;
944 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
945 return -EFAULT;
946 if (gsf.gf_group.ss_family != AF_INET6)
947 return -EADDRNOTAVAIL;
948 lock_sock(sk);
949 err = ip6_mc_msfget(sk, &gsf,
950 (struct group_filter __user *)optval, optlen);
951 release_sock(sk);
952 return err;
953 }
954
955 case IPV6_2292PKTOPTIONS:
956 {
957 struct msghdr msg;
958 struct sk_buff *skb;
959
960 if (sk->sk_type != SOCK_STREAM)
961 return -ENOPROTOOPT;
962
963 msg.msg_control = optval;
964 msg.msg_controllen = len;
965 msg.msg_flags = flags;
966
967 lock_sock(sk);
968 skb = np->pktoptions;
969 if (skb)
970 atomic_inc(&skb->users);
971 release_sock(sk);
972
973 if (skb) {
974 int err = datagram_recv_ctl(sk, &msg, skb);
975 kfree_skb(skb);
976 if (err)
977 return err;
978 } else {
979 if (np->rxopt.bits.rxinfo) {
980 struct in6_pktinfo src_info;
981 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
982 np->sticky_pktinfo.ipi6_ifindex;
983 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
984 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
985 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
986 }
987 if (np->rxopt.bits.rxhlim) {
988 int hlim = np->mcast_hops;
989 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
990 }
991 if (np->rxopt.bits.rxoinfo) {
992 struct in6_pktinfo src_info;
993 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
994 np->sticky_pktinfo.ipi6_ifindex;
995 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
996 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
997 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
998 }
999 if (np->rxopt.bits.rxohlim) {
1000 int hlim = np->mcast_hops;
1001 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1002 }
1003 }
1004 len -= msg.msg_controllen;
1005 return put_user(len, optlen);
1006 }
1007 case IPV6_MTU:
1008 {
1009 struct dst_entry *dst;
1010
1011 val = 0;
1012 rcu_read_lock();
1013 dst = __sk_dst_get(sk);
1014 if (dst)
1015 val = dst_mtu(dst);
1016 rcu_read_unlock();
1017 if (!val)
1018 return -ENOTCONN;
1019 break;
1020 }
1021
1022 case IPV6_V6ONLY:
1023 val = np->ipv6only;
1024 break;
1025
1026 case IPV6_RECVPKTINFO:
1027 val = np->rxopt.bits.rxinfo;
1028 break;
1029
1030 case IPV6_2292PKTINFO:
1031 val = np->rxopt.bits.rxoinfo;
1032 break;
1033
1034 case IPV6_RECVHOPLIMIT:
1035 val = np->rxopt.bits.rxhlim;
1036 break;
1037
1038 case IPV6_2292HOPLIMIT:
1039 val = np->rxopt.bits.rxohlim;
1040 break;
1041
1042 case IPV6_RECVRTHDR:
1043 val = np->rxopt.bits.srcrt;
1044 break;
1045
1046 case IPV6_2292RTHDR:
1047 val = np->rxopt.bits.osrcrt;
1048 break;
1049
1050 case IPV6_HOPOPTS:
1051 case IPV6_RTHDRDSTOPTS:
1052 case IPV6_RTHDR:
1053 case IPV6_DSTOPTS:
1054 {
1055
1056 lock_sock(sk);
1057 len = ipv6_getsockopt_sticky(sk, np->opt,
1058 optname, optval, len);
1059 release_sock(sk);
1060 /* check if ipv6_getsockopt_sticky() returns err code */
1061 if (len < 0)
1062 return len;
1063 return put_user(len, optlen);
1064 }
1065
1066 case IPV6_RECVHOPOPTS:
1067 val = np->rxopt.bits.hopopts;
1068 break;
1069
1070 case IPV6_2292HOPOPTS:
1071 val = np->rxopt.bits.ohopopts;
1072 break;
1073
1074 case IPV6_RECVDSTOPTS:
1075 val = np->rxopt.bits.dstopts;
1076 break;
1077
1078 case IPV6_2292DSTOPTS:
1079 val = np->rxopt.bits.odstopts;
1080 break;
1081
1082 case IPV6_TCLASS:
1083 val = np->tclass;
1084 break;
1085
1086 case IPV6_RECVTCLASS:
1087 val = np->rxopt.bits.rxtclass;
1088 break;
1089
1090 case IPV6_FLOWINFO:
1091 val = np->rxopt.bits.rxflow;
1092 break;
1093
1094 case IPV6_RECVPATHMTU:
1095 val = np->rxopt.bits.rxpmtu;
1096 break;
1097
1098 case IPV6_PATHMTU:
1099 {
1100 struct dst_entry *dst;
1101 struct ip6_mtuinfo mtuinfo;
1102
1103 if (len < sizeof(mtuinfo))
1104 return -EINVAL;
1105
1106 len = sizeof(mtuinfo);
1107 memset(&mtuinfo, 0, sizeof(mtuinfo));
1108
1109 rcu_read_lock();
1110 dst = __sk_dst_get(sk);
1111 if (dst)
1112 mtuinfo.ip6m_mtu = dst_mtu(dst);
1113 rcu_read_unlock();
1114 if (!mtuinfo.ip6m_mtu)
1115 return -ENOTCONN;
1116
1117 if (put_user(len, optlen))
1118 return -EFAULT;
1119 if (copy_to_user(optval, &mtuinfo, len))
1120 return -EFAULT;
1121
1122 return 0;
1123 break;
1124 }
1125
1126 case IPV6_TRANSPARENT:
1127 val = inet_sk(sk)->transparent;
1128 break;
1129
1130 case IPV6_RECVORIGDSTADDR:
1131 val = np->rxopt.bits.rxorigdstaddr;
1132 break;
1133
1134 case IPV6_UNICAST_HOPS:
1135 case IPV6_MULTICAST_HOPS:
1136 {
1137 struct dst_entry *dst;
1138
1139 if (optname == IPV6_UNICAST_HOPS)
1140 val = np->hop_limit;
1141 else
1142 val = np->mcast_hops;
1143
1144 if (val < 0) {
1145 rcu_read_lock();
1146 dst = __sk_dst_get(sk);
1147 if (dst)
1148 val = ip6_dst_hoplimit(dst);
1149 rcu_read_unlock();
1150 }
1151
1152 if (val < 0)
1153 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1154 break;
1155 }
1156
1157 case IPV6_MULTICAST_LOOP:
1158 val = np->mc_loop;
1159 break;
1160
1161 case IPV6_MULTICAST_IF:
1162 val = np->mcast_oif;
1163 break;
1164
1165 case IPV6_MTU_DISCOVER:
1166 val = np->pmtudisc;
1167 break;
1168
1169 case IPV6_RECVERR:
1170 val = np->recverr;
1171 break;
1172
1173 case IPV6_FLOWINFO_SEND:
1174 val = np->sndflow;
1175 break;
1176
1177 case IPV6_ADDR_PREFERENCES:
1178 val = 0;
1179
1180 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1181 val |= IPV6_PREFER_SRC_TMP;
1182 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1183 val |= IPV6_PREFER_SRC_PUBLIC;
1184 else {
1185 /* XXX: should we return system default? */
1186 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1187 }
1188
1189 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1190 val |= IPV6_PREFER_SRC_COA;
1191 else
1192 val |= IPV6_PREFER_SRC_HOME;
1193 break;
1194
1195 case IPV6_MINHOPCOUNT:
1196 val = np->min_hopcount;
1197 break;
1198
1199 case IPV6_DONTFRAG:
1200 val = np->dontfrag;
1201 break;
1202
1203 default:
1204 return -ENOPROTOOPT;
1205 }
1206 len = min_t(unsigned int, sizeof(int), len);
1207 if(put_user(len, optlen))
1208 return -EFAULT;
1209 if(copy_to_user(optval,&val,len))
1210 return -EFAULT;
1211 return 0;
1212}
1213
1214int ipv6_getsockopt(struct sock *sk, int level, int optname,
1215 char __user *optval, int __user *optlen)
1216{
1217 int err;
1218
1219 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1220 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1221
1222 if(level != SOL_IPV6)
1223 return -ENOPROTOOPT;
1224
1225 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1226#ifdef CONFIG_NETFILTER
1227 /* we need to exclude all possible ENOPROTOOPTs except default case */
1228 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1229 int len;
1230
1231 if (get_user(len, optlen))
1232 return -EFAULT;
1233
1234 lock_sock(sk);
1235 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1236 &len);
1237 release_sock(sk);
1238 if (err >= 0)
1239 err = put_user(len, optlen);
1240 }
1241#endif
1242 return err;
1243}
1244
1245EXPORT_SYMBOL(ipv6_getsockopt);
1246
1247#ifdef CONFIG_COMPAT
1248int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1249 char __user *optval, int __user *optlen)
1250{
1251 int err;
1252
1253 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1254 if (udp_prot.compat_getsockopt != NULL)
1255 return udp_prot.compat_getsockopt(sk, level, optname,
1256 optval, optlen);
1257 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1258 }
1259
1260 if (level != SOL_IPV6)
1261 return -ENOPROTOOPT;
1262
1263 if (optname == MCAST_MSFILTER)
1264 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1265 ipv6_getsockopt);
1266
1267 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1268 MSG_CMSG_COMPAT);
1269#ifdef CONFIG_NETFILTER
1270 /* we need to exclude all possible ENOPROTOOPTs except default case */
1271 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1272 int len;
1273
1274 if (get_user(len, optlen))
1275 return -EFAULT;
1276
1277 lock_sock(sk);
1278 err = compat_nf_getsockopt(sk, PF_INET6,
1279 optname, optval, &len);
1280 release_sock(sk);
1281 if (err >= 0)
1282 err = put_user(len, optlen);
1283 }
1284#endif
1285 return err;
1286}
1287
1288EXPORT_SYMBOL(compat_ipv6_getsockopt);
1289#endif
1290