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perf buildid: Fix possible unterminated readlink() result buffer
[linux-2.6/linux-mips.git] / net / ipv6 / ipv6_sockglue.c
blob2fbda5fc4cc48ffd5a1286b3a26f887148f9af38
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
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
60
61 int 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
101 static
102 struct 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
124 static 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);
415 sticky_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;
482 update:
483 retv = 0;
484 opt = ipv6_update_options(sk, opt);
485 done:
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);
763 pref_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;
778 pref_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
812 e_inval:
813 release_sock(sk);
814 return -EINVAL;
815 }
816
817 int 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
842 EXPORT_SYMBOL(ipv6_setsockopt);
843
844 #ifdef CONFIG_COMPAT
845 int 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
878 EXPORT_SYMBOL(compat_ipv6_setsockopt);
879 #endif
880
881 static 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
915 static 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
1214 int 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
1245 EXPORT_SYMBOL(ipv6_getsockopt);
1246
1247 #ifdef CONFIG_COMPAT
1248 int 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
1288 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1289 #endif
1290
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