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
40 #include <net/sock.h>
41 #include <net/snmp.h>
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
49 #include <net/tcp.h>
50 #include <net/udp.h>
51 #include <net/udplite.h>
52 #include <net/xfrm.h>
53 #include <net/compat.h>
54
55 #include <asm/uaccess.h>
56
57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
58
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
61
ip6_ra_control(struct sock * sk,int sel)62 int ip6_ra_control(struct sock *sk, int sel)
63 {
64 struct ip6_ra_chain *ra, *new_ra, **rap;
65
66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
68 return -ENOPROTOOPT;
69
70 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel>=0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (new_ra == NULL) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
102 static
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
104 struct ipv6_txoptions *opt)
105 {
106 if (inet_sk(sk)->is_icsk) {
107 if (opt &&
108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
109 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
110 struct inet_connection_sock *icsk = inet_csk(sk);
111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
113 }
114 opt = xchg(&inet6_sk(sk)->opt, opt);
115 } else {
116 write_lock(&sk->sk_dst_lock);
117 opt = xchg(&inet6_sk(sk)->opt, opt);
118 write_unlock(&sk->sk_dst_lock);
119 }
120 sk_dst_reset(sk);
121
122 return opt;
123 }
124
do_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,int optlen)125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
126 char __user *optval, int optlen)
127 {
128 struct ipv6_pinfo *np = inet6_sk(sk);
129 struct net *net = sock_net(sk);
130 int val, valbool;
131 int retv = -ENOPROTOOPT;
132
133 if (optval == NULL)
134 val=0;
135 else {
136 if (optlen >= sizeof(int)) {
137 if (get_user(val, (int __user *) optval))
138 return -EFAULT;
139 } else
140 val = 0;
141 }
142
143 valbool = (val!=0);
144
145 if (ip6_mroute_opt(optname))
146 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
147
148 lock_sock(sk);
149
150 switch (optname) {
151
152 case IPV6_ADDRFORM:
153 if (optlen < sizeof(int))
154 goto e_inval;
155 if (val == PF_INET) {
156 struct ipv6_txoptions *opt;
157 struct sk_buff *pktopt;
158
159 if (sk->sk_type == SOCK_RAW)
160 break;
161
162 if (sk->sk_protocol == IPPROTO_UDP ||
163 sk->sk_protocol == IPPROTO_UDPLITE) {
164 struct udp_sock *up = udp_sk(sk);
165 if (up->pending == AF_INET6) {
166 retv = -EBUSY;
167 break;
168 }
169 } else if (sk->sk_protocol != IPPROTO_TCP)
170 break;
171
172 if (sk->sk_state != TCP_ESTABLISHED) {
173 retv = -ENOTCONN;
174 break;
175 }
176
177 if (ipv6_only_sock(sk) ||
178 !ipv6_addr_v4mapped(&np->daddr)) {
179 retv = -EADDRNOTAVAIL;
180 break;
181 }
182
183 fl6_free_socklist(sk);
184 ipv6_sock_mc_close(sk);
185
186 /*
187 * Sock is moving from IPv6 to IPv4 (sk_prot), so
188 * remove it from the refcnt debug socks count in the
189 * original family...
190 */
191 sk_refcnt_debug_dec(sk);
192
193 if (sk->sk_protocol == IPPROTO_TCP) {
194 struct inet_connection_sock *icsk = inet_csk(sk);
195 local_bh_disable();
196 sock_prot_inuse_add(net, sk->sk_prot, -1);
197 sock_prot_inuse_add(net, &tcp_prot, 1);
198 local_bh_enable();
199 sk->sk_prot = &tcp_prot;
200 icsk->icsk_af_ops = &ipv4_specific;
201 sk->sk_socket->ops = &inet_stream_ops;
202 sk->sk_family = PF_INET;
203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
204 } else {
205 struct proto *prot = &udp_prot;
206
207 if (sk->sk_protocol == IPPROTO_UDPLITE)
208 prot = &udplite_prot;
209 local_bh_disable();
210 sock_prot_inuse_add(net, sk->sk_prot, -1);
211 sock_prot_inuse_add(net, prot, 1);
212 local_bh_enable();
213 sk->sk_prot = prot;
214 sk->sk_socket->ops = &inet_dgram_ops;
215 sk->sk_family = PF_INET;
216 }
217 opt = xchg(&np->opt, NULL);
218 if (opt)
219 sock_kfree_s(sk, opt, opt->tot_len);
220 pktopt = xchg(&np->pktoptions, NULL);
221 if (pktopt)
222 kfree_skb(pktopt);
223
224 sk->sk_destruct = inet_sock_destruct;
225 /*
226 * ... and add it to the refcnt debug socks count
227 * in the new family. -acme
228 */
229 sk_refcnt_debug_inc(sk);
230 module_put(THIS_MODULE);
231 retv = 0;
232 break;
233 }
234 goto e_inval;
235
236 case IPV6_V6ONLY:
237 if (optlen < sizeof(int) ||
238 inet_sk(sk)->num)
239 goto e_inval;
240 np->ipv6only = valbool;
241 retv = 0;
242 break;
243
244 case IPV6_RECVPKTINFO:
245 if (optlen < sizeof(int))
246 goto e_inval;
247 np->rxopt.bits.rxinfo = valbool;
248 retv = 0;
249 break;
250
251 case IPV6_2292PKTINFO:
252 if (optlen < sizeof(int))
253 goto e_inval;
254 np->rxopt.bits.rxoinfo = valbool;
255 retv = 0;
256 break;
257
258 case IPV6_RECVHOPLIMIT:
259 if (optlen < sizeof(int))
260 goto e_inval;
261 np->rxopt.bits.rxhlim = valbool;
262 retv = 0;
263 break;
264
265 case IPV6_2292HOPLIMIT:
266 if (optlen < sizeof(int))
267 goto e_inval;
268 np->rxopt.bits.rxohlim = valbool;
269 retv = 0;
270 break;
271
272 case IPV6_RECVRTHDR:
273 if (optlen < sizeof(int))
274 goto e_inval;
275 np->rxopt.bits.srcrt = valbool;
276 retv = 0;
277 break;
278
279 case IPV6_2292RTHDR:
280 if (optlen < sizeof(int))
281 goto e_inval;
282 np->rxopt.bits.osrcrt = valbool;
283 retv = 0;
284 break;
285
286 case IPV6_RECVHOPOPTS:
287 if (optlen < sizeof(int))
288 goto e_inval;
289 np->rxopt.bits.hopopts = valbool;
290 retv = 0;
291 break;
292
293 case IPV6_2292HOPOPTS:
294 if (optlen < sizeof(int))
295 goto e_inval;
296 np->rxopt.bits.ohopopts = valbool;
297 retv = 0;
298 break;
299
300 case IPV6_RECVDSTOPTS:
301 if (optlen < sizeof(int))
302 goto e_inval;
303 np->rxopt.bits.dstopts = valbool;
304 retv = 0;
305 break;
306
307 case IPV6_2292DSTOPTS:
308 if (optlen < sizeof(int))
309 goto e_inval;
310 np->rxopt.bits.odstopts = valbool;
311 retv = 0;
312 break;
313
314 case IPV6_TCLASS:
315 if (optlen < sizeof(int))
316 goto e_inval;
317 if (val < -1 || val > 0xff)
318 goto e_inval;
319 np->tclass = val;
320 retv = 0;
321 break;
322
323 case IPV6_RECVTCLASS:
324 if (optlen < sizeof(int))
325 goto e_inval;
326 np->rxopt.bits.rxtclass = valbool;
327 retv = 0;
328 break;
329
330 case IPV6_FLOWINFO:
331 if (optlen < sizeof(int))
332 goto e_inval;
333 np->rxopt.bits.rxflow = valbool;
334 retv = 0;
335 break;
336
337 case IPV6_HOPOPTS:
338 case IPV6_RTHDRDSTOPTS:
339 case IPV6_RTHDR:
340 case IPV6_DSTOPTS:
341 {
342 struct ipv6_txoptions *opt;
343
344 /* remove any sticky options header with a zero option
345 * length, per RFC3542.
346 */
347 if (optlen == 0)
348 optval = NULL;
349 else if (optval == NULL)
350 goto e_inval;
351 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
352 optlen & 0x7 || optlen > 8 * 255)
353 goto e_inval;
354
355 /* hop-by-hop / destination options are privileged option */
356 retv = -EPERM;
357 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
358 break;
359
360 opt = ipv6_renew_options(sk, np->opt, optname,
361 (struct ipv6_opt_hdr __user *)optval,
362 optlen);
363 if (IS_ERR(opt)) {
364 retv = PTR_ERR(opt);
365 break;
366 }
367
368 /* routing header option needs extra check */
369 retv = -EINVAL;
370 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
371 struct ipv6_rt_hdr *rthdr = opt->srcrt;
372 switch (rthdr->type) {
373 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
374 case IPV6_SRCRT_TYPE_2:
375 if (rthdr->hdrlen != 2 ||
376 rthdr->segments_left != 1)
377 goto sticky_done;
378
379 break;
380 #endif
381 default:
382 goto sticky_done;
383 }
384
385 if ((rthdr->hdrlen & 1) ||
386 (rthdr->hdrlen >> 1) != rthdr->segments_left)
387 goto sticky_done;
388 }
389
390 retv = 0;
391 opt = ipv6_update_options(sk, opt);
392 sticky_done:
393 if (opt)
394 sock_kfree_s(sk, opt, opt->tot_len);
395 break;
396 }
397
398 case IPV6_PKTINFO:
399 {
400 struct in6_pktinfo pkt;
401
402 if (optlen == 0)
403 goto e_inval;
404 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
405 goto e_inval;
406
407 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
408 retv = -EFAULT;
409 break;
410 }
411 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
412 goto e_inval;
413
414 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
415 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
416 retv = 0;
417 break;
418 }
419
420 case IPV6_2292PKTOPTIONS:
421 {
422 struct ipv6_txoptions *opt = NULL;
423 struct msghdr msg;
424 struct flowi fl;
425 int junk;
426
427 fl.fl6_flowlabel = 0;
428 fl.oif = sk->sk_bound_dev_if;
429
430 if (optlen == 0)
431 goto update;
432
433 /* 1K is probably excessive
434 * 1K is surely not enough, 2K per standard header is 16K.
435 */
436 retv = -EINVAL;
437 if (optlen > 64*1024)
438 break;
439
440 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
441 retv = -ENOBUFS;
442 if (opt == NULL)
443 break;
444
445 memset(opt, 0, sizeof(*opt));
446 opt->tot_len = sizeof(*opt) + optlen;
447 retv = -EFAULT;
448 if (copy_from_user(opt+1, optval, optlen))
449 goto done;
450
451 msg.msg_controllen = optlen;
452 msg.msg_control = (void*)(opt+1);
453
454 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
455 if (retv)
456 goto done;
457 update:
458 retv = 0;
459 opt = ipv6_update_options(sk, opt);
460 done:
461 if (opt)
462 sock_kfree_s(sk, opt, opt->tot_len);
463 break;
464 }
465 case IPV6_UNICAST_HOPS:
466 if (optlen < sizeof(int))
467 goto e_inval;
468 if (val > 255 || val < -1)
469 goto e_inval;
470 np->hop_limit = val;
471 retv = 0;
472 break;
473
474 case IPV6_MULTICAST_HOPS:
475 if (sk->sk_type == SOCK_STREAM)
476 break;
477 if (optlen < sizeof(int))
478 goto e_inval;
479 if (val > 255 || val < -1)
480 goto e_inval;
481 np->mcast_hops = val;
482 retv = 0;
483 break;
484
485 case IPV6_MULTICAST_LOOP:
486 if (optlen < sizeof(int))
487 goto e_inval;
488 if (val != valbool)
489 goto e_inval;
490 np->mc_loop = valbool;
491 retv = 0;
492 break;
493
494 case IPV6_MULTICAST_IF:
495 if (sk->sk_type == SOCK_STREAM)
496 break;
497 if (optlen < sizeof(int))
498 goto e_inval;
499
500 if (val) {
501 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
502 goto e_inval;
503
504 if (__dev_get_by_index(net, val) == NULL) {
505 retv = -ENODEV;
506 break;
507 }
508 }
509 np->mcast_oif = val;
510 retv = 0;
511 break;
512 case IPV6_ADD_MEMBERSHIP:
513 case IPV6_DROP_MEMBERSHIP:
514 {
515 struct ipv6_mreq mreq;
516
517 if (optlen < sizeof(struct ipv6_mreq))
518 goto e_inval;
519
520 retv = -EPROTO;
521 if (inet_sk(sk)->is_icsk)
522 break;
523
524 retv = -EFAULT;
525 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
526 break;
527
528 if (optname == IPV6_ADD_MEMBERSHIP)
529 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
530 else
531 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
532 break;
533 }
534 case IPV6_JOIN_ANYCAST:
535 case IPV6_LEAVE_ANYCAST:
536 {
537 struct ipv6_mreq mreq;
538
539 if (optlen < sizeof(struct ipv6_mreq))
540 goto e_inval;
541
542 retv = -EFAULT;
543 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
544 break;
545
546 if (optname == IPV6_JOIN_ANYCAST)
547 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
548 else
549 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
550 break;
551 }
552 case MCAST_JOIN_GROUP:
553 case MCAST_LEAVE_GROUP:
554 {
555 struct group_req greq;
556 struct sockaddr_in6 *psin6;
557
558 if (optlen < sizeof(struct group_req))
559 goto e_inval;
560
561 retv = -EFAULT;
562 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
563 break;
564 if (greq.gr_group.ss_family != AF_INET6) {
565 retv = -EADDRNOTAVAIL;
566 break;
567 }
568 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
569 if (optname == MCAST_JOIN_GROUP)
570 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
571 &psin6->sin6_addr);
572 else
573 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
574 &psin6->sin6_addr);
575 break;
576 }
577 case MCAST_JOIN_SOURCE_GROUP:
578 case MCAST_LEAVE_SOURCE_GROUP:
579 case MCAST_BLOCK_SOURCE:
580 case MCAST_UNBLOCK_SOURCE:
581 {
582 struct group_source_req greqs;
583 int omode, add;
584
585 if (optlen < sizeof(struct group_source_req))
586 goto e_inval;
587 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
588 retv = -EFAULT;
589 break;
590 }
591 if (greqs.gsr_group.ss_family != AF_INET6 ||
592 greqs.gsr_source.ss_family != AF_INET6) {
593 retv = -EADDRNOTAVAIL;
594 break;
595 }
596 if (optname == MCAST_BLOCK_SOURCE) {
597 omode = MCAST_EXCLUDE;
598 add = 1;
599 } else if (optname == MCAST_UNBLOCK_SOURCE) {
600 omode = MCAST_EXCLUDE;
601 add = 0;
602 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
603 struct sockaddr_in6 *psin6;
604
605 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
606 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
607 &psin6->sin6_addr);
608 /* prior join w/ different source is ok */
609 if (retv && retv != -EADDRINUSE)
610 break;
611 omode = MCAST_INCLUDE;
612 add = 1;
613 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
614 omode = MCAST_INCLUDE;
615 add = 0;
616 }
617 retv = ip6_mc_source(add, omode, sk, &greqs);
618 break;
619 }
620 case MCAST_MSFILTER:
621 {
622 extern int sysctl_mld_max_msf;
623 struct group_filter *gsf;
624
625 if (optlen < GROUP_FILTER_SIZE(0))
626 goto e_inval;
627 if (optlen > sysctl_optmem_max) {
628 retv = -ENOBUFS;
629 break;
630 }
631 gsf = kmalloc(optlen,GFP_KERNEL);
632 if (!gsf) {
633 retv = -ENOBUFS;
634 break;
635 }
636 retv = -EFAULT;
637 if (copy_from_user(gsf, optval, optlen)) {
638 kfree(gsf);
639 break;
640 }
641 /* numsrc >= (4G-140)/128 overflow in 32 bits */
642 if (gsf->gf_numsrc >= 0x1ffffffU ||
643 gsf->gf_numsrc > sysctl_mld_max_msf) {
644 kfree(gsf);
645 retv = -ENOBUFS;
646 break;
647 }
648 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
649 kfree(gsf);
650 retv = -EINVAL;
651 break;
652 }
653 retv = ip6_mc_msfilter(sk, gsf);
654 kfree(gsf);
655
656 break;
657 }
658 case IPV6_ROUTER_ALERT:
659 if (optlen < sizeof(int))
660 goto e_inval;
661 retv = ip6_ra_control(sk, val);
662 break;
663 case IPV6_MTU_DISCOVER:
664 if (optlen < sizeof(int))
665 goto e_inval;
666 if (val<0 || val>3)
667 goto e_inval;
668 np->pmtudisc = val;
669 retv = 0;
670 break;
671 case IPV6_MTU:
672 if (optlen < sizeof(int))
673 goto e_inval;
674 if (val && val < IPV6_MIN_MTU)
675 goto e_inval;
676 np->frag_size = val;
677 retv = 0;
678 break;
679 case IPV6_RECVERR:
680 if (optlen < sizeof(int))
681 goto e_inval;
682 np->recverr = valbool;
683 if (!val)
684 skb_queue_purge(&sk->sk_error_queue);
685 retv = 0;
686 break;
687 case IPV6_FLOWINFO_SEND:
688 if (optlen < sizeof(int))
689 goto e_inval;
690 np->sndflow = valbool;
691 retv = 0;
692 break;
693 case IPV6_FLOWLABEL_MGR:
694 retv = ipv6_flowlabel_opt(sk, optval, optlen);
695 break;
696 case IPV6_IPSEC_POLICY:
697 case IPV6_XFRM_POLICY:
698 retv = -EPERM;
699 if (!capable(CAP_NET_ADMIN))
700 break;
701 retv = xfrm_user_policy(sk, optname, optval, optlen);
702 break;
703
704 case IPV6_ADDR_PREFERENCES:
705 {
706 unsigned int pref = 0;
707 unsigned int prefmask = ~0;
708
709 if (optlen < sizeof(int))
710 goto e_inval;
711
712 retv = -EINVAL;
713
714 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
715 switch (val & (IPV6_PREFER_SRC_PUBLIC|
716 IPV6_PREFER_SRC_TMP|
717 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
718 case IPV6_PREFER_SRC_PUBLIC:
719 pref |= IPV6_PREFER_SRC_PUBLIC;
720 break;
721 case IPV6_PREFER_SRC_TMP:
722 pref |= IPV6_PREFER_SRC_TMP;
723 break;
724 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
725 break;
726 case 0:
727 goto pref_skip_pubtmp;
728 default:
729 goto e_inval;
730 }
731
732 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
733 IPV6_PREFER_SRC_TMP);
734 pref_skip_pubtmp:
735
736 /* check HOME/COA conflicts */
737 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
738 case IPV6_PREFER_SRC_HOME:
739 break;
740 case IPV6_PREFER_SRC_COA:
741 pref |= IPV6_PREFER_SRC_COA;
742 case 0:
743 goto pref_skip_coa;
744 default:
745 goto e_inval;
746 }
747
748 prefmask &= ~IPV6_PREFER_SRC_COA;
749 pref_skip_coa:
750
751 /* check CGA/NONCGA conflicts */
752 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
753 case IPV6_PREFER_SRC_CGA:
754 case IPV6_PREFER_SRC_NONCGA:
755 case 0:
756 break;
757 default:
758 goto e_inval;
759 }
760
761 np->srcprefs = (np->srcprefs & prefmask) | pref;
762 retv = 0;
763
764 break;
765 }
766 }
767
768 release_sock(sk);
769
770 return retv;
771
772 e_inval:
773 release_sock(sk);
774 return -EINVAL;
775 }
776
ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,int optlen)777 int ipv6_setsockopt(struct sock *sk, int level, int optname,
778 char __user *optval, int optlen)
779 {
780 int err;
781
782 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
783 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
784
785 if (level != SOL_IPV6)
786 return -ENOPROTOOPT;
787
788 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
789 #ifdef CONFIG_NETFILTER
790 /* we need to exclude all possible ENOPROTOOPTs except default case */
791 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
792 optname != IPV6_XFRM_POLICY) {
793 lock_sock(sk);
794 err = nf_setsockopt(sk, PF_INET6, optname, optval,
795 optlen);
796 release_sock(sk);
797 }
798 #endif
799 return err;
800 }
801
802 EXPORT_SYMBOL(ipv6_setsockopt);
803
804 #ifdef CONFIG_COMPAT
compat_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,int optlen)805 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
806 char __user *optval, int optlen)
807 {
808 int err;
809
810 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
811 if (udp_prot.compat_setsockopt != NULL)
812 return udp_prot.compat_setsockopt(sk, level, optname,
813 optval, optlen);
814 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
815 }
816
817 if (level != SOL_IPV6)
818 return -ENOPROTOOPT;
819
820 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
821 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
822 ipv6_setsockopt);
823
824 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
825 #ifdef CONFIG_NETFILTER
826 /* we need to exclude all possible ENOPROTOOPTs except default case */
827 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
828 optname != IPV6_XFRM_POLICY) {
829 lock_sock(sk);
830 err = compat_nf_setsockopt(sk, PF_INET6, optname,
831 optval, optlen);
832 release_sock(sk);
833 }
834 #endif
835 return err;
836 }
837
838 EXPORT_SYMBOL(compat_ipv6_setsockopt);
839 #endif
840
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,char __user * optval,int len)841 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
842 int optname, char __user *optval, int len)
843 {
844 struct ipv6_opt_hdr *hdr;
845
846 if (!opt)
847 return 0;
848
849 switch(optname) {
850 case IPV6_HOPOPTS:
851 hdr = opt->hopopt;
852 break;
853 case IPV6_RTHDRDSTOPTS:
854 hdr = opt->dst0opt;
855 break;
856 case IPV6_RTHDR:
857 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
858 break;
859 case IPV6_DSTOPTS:
860 hdr = opt->dst1opt;
861 break;
862 default:
863 return -EINVAL; /* should not happen */
864 }
865
866 if (!hdr)
867 return 0;
868
869 len = min_t(unsigned int, len, ipv6_optlen(hdr));
870 if (copy_to_user(optval, hdr, len))
871 return -EFAULT;
872 return len;
873 }
874
do_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)875 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
876 char __user *optval, int __user *optlen)
877 {
878 struct ipv6_pinfo *np = inet6_sk(sk);
879 int len;
880 int val;
881
882 if (ip6_mroute_opt(optname))
883 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
884
885 if (get_user(len, optlen))
886 return -EFAULT;
887 switch (optname) {
888 case IPV6_ADDRFORM:
889 if (sk->sk_protocol != IPPROTO_UDP &&
890 sk->sk_protocol != IPPROTO_UDPLITE &&
891 sk->sk_protocol != IPPROTO_TCP)
892 return -ENOPROTOOPT;
893 if (sk->sk_state != TCP_ESTABLISHED)
894 return -ENOTCONN;
895 val = sk->sk_family;
896 break;
897 case MCAST_MSFILTER:
898 {
899 struct group_filter gsf;
900 int err;
901
902 if (len < GROUP_FILTER_SIZE(0))
903 return -EINVAL;
904 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
905 return -EFAULT;
906 if (gsf.gf_group.ss_family != AF_INET6)
907 return -EADDRNOTAVAIL;
908 lock_sock(sk);
909 err = ip6_mc_msfget(sk, &gsf,
910 (struct group_filter __user *)optval, optlen);
911 release_sock(sk);
912 return err;
913 }
914
915 case IPV6_2292PKTOPTIONS:
916 {
917 struct msghdr msg;
918 struct sk_buff *skb;
919
920 if (sk->sk_type != SOCK_STREAM)
921 return -ENOPROTOOPT;
922
923 msg.msg_control = optval;
924 msg.msg_controllen = len;
925 msg.msg_flags = 0;
926
927 lock_sock(sk);
928 skb = np->pktoptions;
929 if (skb)
930 atomic_inc(&skb->users);
931 release_sock(sk);
932
933 if (skb) {
934 int err = datagram_recv_ctl(sk, &msg, skb);
935 kfree_skb(skb);
936 if (err)
937 return err;
938 } else {
939 if (np->rxopt.bits.rxinfo) {
940 struct in6_pktinfo src_info;
941 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
942 np->sticky_pktinfo.ipi6_ifindex;
943 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
944 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
945 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
946 }
947 if (np->rxopt.bits.rxhlim) {
948 int hlim = np->mcast_hops;
949 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
950 }
951 if (np->rxopt.bits.rxoinfo) {
952 struct in6_pktinfo src_info;
953 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
954 np->sticky_pktinfo.ipi6_ifindex;
955 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
956 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
957 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
958 }
959 if (np->rxopt.bits.rxohlim) {
960 int hlim = np->mcast_hops;
961 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
962 }
963 }
964 len -= msg.msg_controllen;
965 return put_user(len, optlen);
966 }
967 case IPV6_MTU:
968 {
969 struct dst_entry *dst;
970 val = 0;
971 lock_sock(sk);
972 dst = sk_dst_get(sk);
973 if (dst) {
974 val = dst_mtu(dst);
975 dst_release(dst);
976 }
977 release_sock(sk);
978 if (!val)
979 return -ENOTCONN;
980 break;
981 }
982
983 case IPV6_V6ONLY:
984 val = np->ipv6only;
985 break;
986
987 case IPV6_RECVPKTINFO:
988 val = np->rxopt.bits.rxinfo;
989 break;
990
991 case IPV6_2292PKTINFO:
992 val = np->rxopt.bits.rxoinfo;
993 break;
994
995 case IPV6_RECVHOPLIMIT:
996 val = np->rxopt.bits.rxhlim;
997 break;
998
999 case IPV6_2292HOPLIMIT:
1000 val = np->rxopt.bits.rxohlim;
1001 break;
1002
1003 case IPV6_RECVRTHDR:
1004 val = np->rxopt.bits.srcrt;
1005 break;
1006
1007 case IPV6_2292RTHDR:
1008 val = np->rxopt.bits.osrcrt;
1009 break;
1010
1011 case IPV6_HOPOPTS:
1012 case IPV6_RTHDRDSTOPTS:
1013 case IPV6_RTHDR:
1014 case IPV6_DSTOPTS:
1015 {
1016
1017 lock_sock(sk);
1018 len = ipv6_getsockopt_sticky(sk, np->opt,
1019 optname, optval, len);
1020 release_sock(sk);
1021 /* check if ipv6_getsockopt_sticky() returns err code */
1022 if (len < 0)
1023 return len;
1024 return put_user(len, optlen);
1025 }
1026
1027 case IPV6_RECVHOPOPTS:
1028 val = np->rxopt.bits.hopopts;
1029 break;
1030
1031 case IPV6_2292HOPOPTS:
1032 val = np->rxopt.bits.ohopopts;
1033 break;
1034
1035 case IPV6_RECVDSTOPTS:
1036 val = np->rxopt.bits.dstopts;
1037 break;
1038
1039 case IPV6_2292DSTOPTS:
1040 val = np->rxopt.bits.odstopts;
1041 break;
1042
1043 case IPV6_TCLASS:
1044 val = np->tclass;
1045 if (val < 0)
1046 val = 0;
1047 break;
1048
1049 case IPV6_RECVTCLASS:
1050 val = np->rxopt.bits.rxtclass;
1051 break;
1052
1053 case IPV6_FLOWINFO:
1054 val = np->rxopt.bits.rxflow;
1055 break;
1056
1057 case IPV6_UNICAST_HOPS:
1058 case IPV6_MULTICAST_HOPS:
1059 {
1060 struct dst_entry *dst;
1061
1062 if (optname == IPV6_UNICAST_HOPS)
1063 val = np->hop_limit;
1064 else
1065 val = np->mcast_hops;
1066
1067 dst = sk_dst_get(sk);
1068 if (dst) {
1069 if (val < 0)
1070 val = ip6_dst_hoplimit(dst);
1071 dst_release(dst);
1072 }
1073 if (val < 0)
1074 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1075 break;
1076 }
1077
1078 case IPV6_MULTICAST_LOOP:
1079 val = np->mc_loop;
1080 break;
1081
1082 case IPV6_MULTICAST_IF:
1083 val = np->mcast_oif;
1084 break;
1085
1086 case IPV6_MTU_DISCOVER:
1087 val = np->pmtudisc;
1088 break;
1089
1090 case IPV6_RECVERR:
1091 val = np->recverr;
1092 break;
1093
1094 case IPV6_FLOWINFO_SEND:
1095 val = np->sndflow;
1096 break;
1097
1098 case IPV6_ADDR_PREFERENCES:
1099 val = 0;
1100
1101 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1102 val |= IPV6_PREFER_SRC_TMP;
1103 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1104 val |= IPV6_PREFER_SRC_PUBLIC;
1105 else {
1106 /* XXX: should we return system default? */
1107 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1108 }
1109
1110 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1111 val |= IPV6_PREFER_SRC_COA;
1112 else
1113 val |= IPV6_PREFER_SRC_HOME;
1114 break;
1115
1116 default:
1117 return -ENOPROTOOPT;
1118 }
1119 len = min_t(unsigned int, sizeof(int), len);
1120 if(put_user(len, optlen))
1121 return -EFAULT;
1122 if(copy_to_user(optval,&val,len))
1123 return -EFAULT;
1124 return 0;
1125 }
1126
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1127 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1128 char __user *optval, int __user *optlen)
1129 {
1130 int err;
1131
1132 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1133 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1134
1135 if(level != SOL_IPV6)
1136 return -ENOPROTOOPT;
1137
1138 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1139 #ifdef CONFIG_NETFILTER
1140 /* we need to exclude all possible ENOPROTOOPTs except default case */
1141 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1142 int len;
1143
1144 if (get_user(len, optlen))
1145 return -EFAULT;
1146
1147 lock_sock(sk);
1148 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1149 &len);
1150 release_sock(sk);
1151 if (err >= 0)
1152 err = put_user(len, optlen);
1153 }
1154 #endif
1155 return err;
1156 }
1157
1158 EXPORT_SYMBOL(ipv6_getsockopt);
1159
1160 #ifdef CONFIG_COMPAT
compat_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1161 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1162 char __user *optval, int __user *optlen)
1163 {
1164 int err;
1165
1166 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1167 if (udp_prot.compat_getsockopt != NULL)
1168 return udp_prot.compat_getsockopt(sk, level, optname,
1169 optval, optlen);
1170 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1171 }
1172
1173 if (level != SOL_IPV6)
1174 return -ENOPROTOOPT;
1175
1176 if (optname == MCAST_MSFILTER)
1177 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1178 ipv6_getsockopt);
1179
1180 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1181 #ifdef CONFIG_NETFILTER
1182 /* we need to exclude all possible ENOPROTOOPTs except default case */
1183 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1184 int len;
1185
1186 if (get_user(len, optlen))
1187 return -EFAULT;
1188
1189 lock_sock(sk);
1190 err = compat_nf_getsockopt(sk, PF_INET6,
1191 optname, optval, &len);
1192 release_sock(sk);
1193 if (err >= 0)
1194 err = put_user(len, optlen);
1195 }
1196 #endif
1197 return err;
1198 }
1199
1200 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1201 #endif
1202
1203