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[IPV6] ROUTE: Search subtree when backtracking.
[hh.org.git] / net / ipv6 / ipv6_sockglue.c
bloba5eaaf693abf7dad7c3e320f775bafa0f4be631b
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 * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * FIXME: Make the setsockopt code POSIX compliant: That is
18 *
19 * o Return -EINVAL for setsockopt of short lengths
20 * o Truncate getsockopt returns
21 * o Return an optlen of the truncated length if need be
22 *
23 * Changes:
24 * David L Stevens <dlstevens@us.ibm.com>:
25 * - added multicast source filtering API for MLDv2
26 */
27
28 #include <linux/module.h>
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/sockios.h>
34 #include <linux/sched.h>
35 #include <linux/net.h>
36 #include <linux/in6.h>
37 #include <linux/netdevice.h>
38 #include <linux/if_arp.h>
39 #include <linux/init.h>
40 #include <linux/sysctl.h>
41 #include <linux/netfilter.h>
42
43 #include <net/sock.h>
44 #include <net/snmp.h>
45 #include <net/ipv6.h>
46 #include <net/ndisc.h>
47 #include <net/protocol.h>
48 #include <net/transp_v6.h>
49 #include <net/ip6_route.h>
50 #include <net/addrconf.h>
51 #include <net/inet_common.h>
52 #include <net/tcp.h>
53 #include <net/udp.h>
54 #include <net/xfrm.h>
55
56 #include <asm/uaccess.h>
57
58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
59
60 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
61 int proto)
62 {
63 struct inet6_protocol *ops = NULL;
64
65 for (;;) {
66 struct ipv6_opt_hdr *opth;
67 int len;
68
69 if (proto != NEXTHDR_HOP) {
70 ops = rcu_dereference(inet6_protos[proto]);
71
72 if (unlikely(!ops))
73 break;
74
75 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
76 break;
77 }
78
79 if (unlikely(!pskb_may_pull(skb, 8)))
80 break;
81
82 opth = (void *)skb->data;
83 len = opth->hdrlen * 8 + 8;
84
85 if (unlikely(!pskb_may_pull(skb, len)))
86 break;
87
88 proto = opth->nexthdr;
89 __skb_pull(skb, len);
90 }
91
92 return ops;
93 }
94
95 static int ipv6_gso_send_check(struct sk_buff *skb)
96 {
97 struct ipv6hdr *ipv6h;
98 struct inet6_protocol *ops;
99 int err = -EINVAL;
100
101 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
102 goto out;
103
104 ipv6h = skb->nh.ipv6h;
105 __skb_pull(skb, sizeof(*ipv6h));
106 err = -EPROTONOSUPPORT;
107
108 rcu_read_lock();
109 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
110 if (likely(ops && ops->gso_send_check)) {
111 skb->h.raw = skb->data;
112 err = ops->gso_send_check(skb);
113 }
114 rcu_read_unlock();
115
116 out:
117 return err;
118 }
119
120 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
121 {
122 struct sk_buff *segs = ERR_PTR(-EINVAL);
123 struct ipv6hdr *ipv6h;
124 struct inet6_protocol *ops;
125
126 if (unlikely(skb_shinfo(skb)->gso_type &
127 ~(SKB_GSO_UDP |
128 SKB_GSO_DODGY |
129 SKB_GSO_TCP_ECN |
130 SKB_GSO_TCPV6 |
131 0)))
132 goto out;
133
134 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
135 goto out;
136
137 ipv6h = skb->nh.ipv6h;
138 __skb_pull(skb, sizeof(*ipv6h));
139 segs = ERR_PTR(-EPROTONOSUPPORT);
140
141 rcu_read_lock();
142 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
143 if (likely(ops && ops->gso_segment)) {
144 skb->h.raw = skb->data;
145 segs = ops->gso_segment(skb, features);
146 }
147 rcu_read_unlock();
148
149 if (unlikely(IS_ERR(segs)))
150 goto out;
151
152 for (skb = segs; skb; skb = skb->next) {
153 ipv6h = skb->nh.ipv6h;
154 ipv6h->payload_len = htons(skb->len - skb->mac_len -
155 sizeof(*ipv6h));
156 }
157
158 out:
159 return segs;
160 }
161
162 static struct packet_type ipv6_packet_type = {
163 .type = __constant_htons(ETH_P_IPV6),
164 .func = ipv6_rcv,
165 .gso_send_check = ipv6_gso_send_check,
166 .gso_segment = ipv6_gso_segment,
167 };
168
169 struct ip6_ra_chain *ip6_ra_chain;
170 DEFINE_RWLOCK(ip6_ra_lock);
171
172 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
173 {
174 struct ip6_ra_chain *ra, *new_ra, **rap;
175
176 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
177 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
178 return -EINVAL;
179
180 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
181
182 write_lock_bh(&ip6_ra_lock);
183 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
184 if (ra->sk == sk) {
185 if (sel>=0) {
186 write_unlock_bh(&ip6_ra_lock);
187 kfree(new_ra);
188 return -EADDRINUSE;
189 }
190
191 *rap = ra->next;
192 write_unlock_bh(&ip6_ra_lock);
193
194 if (ra->destructor)
195 ra->destructor(sk);
196 sock_put(sk);
197 kfree(ra);
198 return 0;
199 }
200 }
201 if (new_ra == NULL) {
202 write_unlock_bh(&ip6_ra_lock);
203 return -ENOBUFS;
204 }
205 new_ra->sk = sk;
206 new_ra->sel = sel;
207 new_ra->destructor = destructor;
208 new_ra->next = ra;
209 *rap = new_ra;
210 sock_hold(sk);
211 write_unlock_bh(&ip6_ra_lock);
212 return 0;
213 }
214
215 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
216 char __user *optval, int optlen)
217 {
218 struct ipv6_pinfo *np = inet6_sk(sk);
219 int val, valbool;
220 int retv = -ENOPROTOOPT;
221
222 if (optval == NULL)
223 val=0;
224 else if (get_user(val, (int __user *) optval))
225 return -EFAULT;
226
227 valbool = (val!=0);
228
229 lock_sock(sk);
230
231 switch (optname) {
232
233 case IPV6_ADDRFORM:
234 if (val == PF_INET) {
235 struct ipv6_txoptions *opt;
236 struct sk_buff *pktopt;
237
238 if (sk->sk_protocol != IPPROTO_UDP &&
239 sk->sk_protocol != IPPROTO_TCP)
240 break;
241
242 if (sk->sk_state != TCP_ESTABLISHED) {
243 retv = -ENOTCONN;
244 break;
245 }
246
247 if (ipv6_only_sock(sk) ||
248 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
249 retv = -EADDRNOTAVAIL;
250 break;
251 }
252
253 fl6_free_socklist(sk);
254 ipv6_sock_mc_close(sk);
255
256 /*
257 * Sock is moving from IPv6 to IPv4 (sk_prot), so
258 * remove it from the refcnt debug socks count in the
259 * original family...
260 */
261 sk_refcnt_debug_dec(sk);
262
263 if (sk->sk_protocol == IPPROTO_TCP) {
264 struct inet_connection_sock *icsk = inet_csk(sk);
265
266 local_bh_disable();
267 sock_prot_dec_use(sk->sk_prot);
268 sock_prot_inc_use(&tcp_prot);
269 local_bh_enable();
270 sk->sk_prot = &tcp_prot;
271 icsk->icsk_af_ops = &ipv4_specific;
272 sk->sk_socket->ops = &inet_stream_ops;
273 sk->sk_family = PF_INET;
274 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
275 } else {
276 local_bh_disable();
277 sock_prot_dec_use(sk->sk_prot);
278 sock_prot_inc_use(&udp_prot);
279 local_bh_enable();
280 sk->sk_prot = &udp_prot;
281 sk->sk_socket->ops = &inet_dgram_ops;
282 sk->sk_family = PF_INET;
283 }
284 opt = xchg(&np->opt, NULL);
285 if (opt)
286 sock_kfree_s(sk, opt, opt->tot_len);
287 pktopt = xchg(&np->pktoptions, NULL);
288 if (pktopt)
289 kfree_skb(pktopt);
290
291 sk->sk_destruct = inet_sock_destruct;
292 /*
293 * ... and add it to the refcnt debug socks count
294 * in the new family. -acme
295 */
296 sk_refcnt_debug_inc(sk);
297 module_put(THIS_MODULE);
298 retv = 0;
299 break;
300 }
301 goto e_inval;
302
303 case IPV6_V6ONLY:
304 if (inet_sk(sk)->num)
305 goto e_inval;
306 np->ipv6only = valbool;
307 retv = 0;
308 break;
309
310 case IPV6_RECVPKTINFO:
311 np->rxopt.bits.rxinfo = valbool;
312 retv = 0;
313 break;
314
315 case IPV6_2292PKTINFO:
316 np->rxopt.bits.rxoinfo = valbool;
317 retv = 0;
318 break;
319
320 case IPV6_RECVHOPLIMIT:
321 np->rxopt.bits.rxhlim = valbool;
322 retv = 0;
323 break;
324
325 case IPV6_2292HOPLIMIT:
326 np->rxopt.bits.rxohlim = valbool;
327 retv = 0;
328 break;
329
330 case IPV6_RECVRTHDR:
331 if (val < 0 || val > 2)
332 goto e_inval;
333 np->rxopt.bits.srcrt = val;
334 retv = 0;
335 break;
336
337 case IPV6_2292RTHDR:
338 if (val < 0 || val > 2)
339 goto e_inval;
340 np->rxopt.bits.osrcrt = val;
341 retv = 0;
342 break;
343
344 case IPV6_RECVHOPOPTS:
345 np->rxopt.bits.hopopts = valbool;
346 retv = 0;
347 break;
348
349 case IPV6_2292HOPOPTS:
350 np->rxopt.bits.ohopopts = valbool;
351 retv = 0;
352 break;
353
354 case IPV6_RECVDSTOPTS:
355 np->rxopt.bits.dstopts = valbool;
356 retv = 0;
357 break;
358
359 case IPV6_2292DSTOPTS:
360 np->rxopt.bits.odstopts = valbool;
361 retv = 0;
362 break;
363
364 case IPV6_TCLASS:
365 if (val < -1 || val > 0xff)
366 goto e_inval;
367 np->tclass = val;
368 retv = 0;
369 break;
370
371 case IPV6_RECVTCLASS:
372 np->rxopt.bits.rxtclass = valbool;
373 retv = 0;
374 break;
375
376 case IPV6_FLOWINFO:
377 np->rxopt.bits.rxflow = valbool;
378 retv = 0;
379 break;
380
381 case IPV6_HOPOPTS:
382 case IPV6_RTHDRDSTOPTS:
383 case IPV6_RTHDR:
384 case IPV6_DSTOPTS:
385 {
386 struct ipv6_txoptions *opt;
387 if (optlen == 0)
388 optval = NULL;
389
390 /* hop-by-hop / destination options are privileged option */
391 retv = -EPERM;
392 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
393 break;
394
395 retv = -EINVAL;
396 if (optlen & 0x7 || optlen > 8 * 255)
397 break;
398
399 opt = ipv6_renew_options(sk, np->opt, optname,
400 (struct ipv6_opt_hdr __user *)optval,
401 optlen);
402 if (IS_ERR(opt)) {
403 retv = PTR_ERR(opt);
404 break;
405 }
406
407 /* routing header option needs extra check */
408 if (optname == IPV6_RTHDR && opt->srcrt) {
409 struct ipv6_rt_hdr *rthdr = opt->srcrt;
410 if (rthdr->type)
411 goto sticky_done;
412 if ((rthdr->hdrlen & 1) ||
413 (rthdr->hdrlen >> 1) != rthdr->segments_left)
414 goto sticky_done;
415 }
416
417 retv = 0;
418 if (inet_sk(sk)->is_icsk) {
419 if (opt) {
420 struct inet_connection_sock *icsk = inet_csk(sk);
421 if (!((1 << sk->sk_state) &
422 (TCPF_LISTEN | TCPF_CLOSE))
423 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
424 icsk->icsk_ext_hdr_len =
425 opt->opt_flen + opt->opt_nflen;
426 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
427 }
428 }
429 opt = xchg(&np->opt, opt);
430 sk_dst_reset(sk);
431 } else {
432 write_lock(&sk->sk_dst_lock);
433 opt = xchg(&np->opt, opt);
434 write_unlock(&sk->sk_dst_lock);
435 sk_dst_reset(sk);
436 }
437 sticky_done:
438 if (opt)
439 sock_kfree_s(sk, opt, opt->tot_len);
440 break;
441 }
442
443 case IPV6_2292PKTOPTIONS:
444 {
445 struct ipv6_txoptions *opt = NULL;
446 struct msghdr msg;
447 struct flowi fl;
448 int junk;
449
450 fl.fl6_flowlabel = 0;
451 fl.oif = sk->sk_bound_dev_if;
452
453 if (optlen == 0)
454 goto update;
455
456 /* 1K is probably excessive
457 * 1K is surely not enough, 2K per standard header is 16K.
458 */
459 retv = -EINVAL;
460 if (optlen > 64*1024)
461 break;
462
463 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
464 retv = -ENOBUFS;
465 if (opt == NULL)
466 break;
467
468 memset(opt, 0, sizeof(*opt));
469 opt->tot_len = sizeof(*opt) + optlen;
470 retv = -EFAULT;
471 if (copy_from_user(opt+1, optval, optlen))
472 goto done;
473
474 msg.msg_controllen = optlen;
475 msg.msg_control = (void*)(opt+1);
476
477 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
478 if (retv)
479 goto done;
480 update:
481 retv = 0;
482 if (inet_sk(sk)->is_icsk) {
483 if (opt) {
484 struct inet_connection_sock *icsk = inet_csk(sk);
485 if (!((1 << sk->sk_state) &
486 (TCPF_LISTEN | TCPF_CLOSE))
487 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
488 icsk->icsk_ext_hdr_len =
489 opt->opt_flen + opt->opt_nflen;
490 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
491 }
492 }
493 opt = xchg(&np->opt, opt);
494 sk_dst_reset(sk);
495 } else {
496 write_lock(&sk->sk_dst_lock);
497 opt = xchg(&np->opt, opt);
498 write_unlock(&sk->sk_dst_lock);
499 sk_dst_reset(sk);
500 }
501
502 done:
503 if (opt)
504 sock_kfree_s(sk, opt, opt->tot_len);
505 break;
506 }
507 case IPV6_UNICAST_HOPS:
508 if (val > 255 || val < -1)
509 goto e_inval;
510 np->hop_limit = val;
511 retv = 0;
512 break;
513
514 case IPV6_MULTICAST_HOPS:
515 if (sk->sk_type == SOCK_STREAM)
516 goto e_inval;
517 if (val > 255 || val < -1)
518 goto e_inval;
519 np->mcast_hops = val;
520 retv = 0;
521 break;
522
523 case IPV6_MULTICAST_LOOP:
524 np->mc_loop = valbool;
525 retv = 0;
526 break;
527
528 case IPV6_MULTICAST_IF:
529 if (sk->sk_type == SOCK_STREAM)
530 goto e_inval;
531 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
532 goto e_inval;
533
534 if (__dev_get_by_index(val) == NULL) {
535 retv = -ENODEV;
536 break;
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 retv = -EFAULT;
547 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
548 break;
549
550 if (optname == IPV6_ADD_MEMBERSHIP)
551 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
552 else
553 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
554 break;
555 }
556 case IPV6_JOIN_ANYCAST:
557 case IPV6_LEAVE_ANYCAST:
558 {
559 struct ipv6_mreq mreq;
560
561 if (optlen != sizeof(struct ipv6_mreq))
562 goto e_inval;
563
564 retv = -EFAULT;
565 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
566 break;
567
568 if (optname == IPV6_JOIN_ANYCAST)
569 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
570 else
571 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
572 break;
573 }
574 case MCAST_JOIN_GROUP:
575 case MCAST_LEAVE_GROUP:
576 {
577 struct group_req greq;
578 struct sockaddr_in6 *psin6;
579
580 retv = -EFAULT;
581 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
582 break;
583 if (greq.gr_group.ss_family != AF_INET6) {
584 retv = -EADDRNOTAVAIL;
585 break;
586 }
587 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
588 if (optname == MCAST_JOIN_GROUP)
589 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
590 &psin6->sin6_addr);
591 else
592 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
593 &psin6->sin6_addr);
594 break;
595 }
596 case MCAST_JOIN_SOURCE_GROUP:
597 case MCAST_LEAVE_SOURCE_GROUP:
598 case MCAST_BLOCK_SOURCE:
599 case MCAST_UNBLOCK_SOURCE:
600 {
601 struct group_source_req greqs;
602 int omode, add;
603
604 if (optlen != sizeof(struct group_source_req))
605 goto e_inval;
606 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
607 retv = -EFAULT;
608 break;
609 }
610 if (greqs.gsr_group.ss_family != AF_INET6 ||
611 greqs.gsr_source.ss_family != AF_INET6) {
612 retv = -EADDRNOTAVAIL;
613 break;
614 }
615 if (optname == MCAST_BLOCK_SOURCE) {
616 omode = MCAST_EXCLUDE;
617 add = 1;
618 } else if (optname == MCAST_UNBLOCK_SOURCE) {
619 omode = MCAST_EXCLUDE;
620 add = 0;
621 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
622 struct sockaddr_in6 *psin6;
623
624 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
625 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
626 &psin6->sin6_addr);
627 /* prior join w/ different source is ok */
628 if (retv && retv != -EADDRINUSE)
629 break;
630 omode = MCAST_INCLUDE;
631 add = 1;
632 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
633 omode = MCAST_INCLUDE;
634 add = 0;
635 }
636 retv = ip6_mc_source(add, omode, sk, &greqs);
637 break;
638 }
639 case MCAST_MSFILTER:
640 {
641 extern int sysctl_mld_max_msf;
642 struct group_filter *gsf;
643
644 if (optlen < GROUP_FILTER_SIZE(0))
645 goto e_inval;
646 if (optlen > sysctl_optmem_max) {
647 retv = -ENOBUFS;
648 break;
649 }
650 gsf = kmalloc(optlen,GFP_KERNEL);
651 if (gsf == 0) {
652 retv = -ENOBUFS;
653 break;
654 }
655 retv = -EFAULT;
656 if (copy_from_user(gsf, optval, optlen)) {
657 kfree(gsf);
658 break;
659 }
660 /* numsrc >= (4G-140)/128 overflow in 32 bits */
661 if (gsf->gf_numsrc >= 0x1ffffffU ||
662 gsf->gf_numsrc > sysctl_mld_max_msf) {
663 kfree(gsf);
664 retv = -ENOBUFS;
665 break;
666 }
667 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
668 kfree(gsf);
669 retv = -EINVAL;
670 break;
671 }
672 retv = ip6_mc_msfilter(sk, gsf);
673 kfree(gsf);
674
675 break;
676 }
677 case IPV6_ROUTER_ALERT:
678 retv = ip6_ra_control(sk, val, NULL);
679 break;
680 case IPV6_MTU_DISCOVER:
681 if (val<0 || val>2)
682 goto e_inval;
683 np->pmtudisc = val;
684 retv = 0;
685 break;
686 case IPV6_MTU:
687 if (val && val < IPV6_MIN_MTU)
688 goto e_inval;
689 np->frag_size = val;
690 retv = 0;
691 break;
692 case IPV6_RECVERR:
693 np->recverr = valbool;
694 if (!val)
695 skb_queue_purge(&sk->sk_error_queue);
696 retv = 0;
697 break;
698 case IPV6_FLOWINFO_SEND:
699 np->sndflow = valbool;
700 retv = 0;
701 break;
702 case IPV6_FLOWLABEL_MGR:
703 retv = ipv6_flowlabel_opt(sk, optval, optlen);
704 break;
705 case IPV6_IPSEC_POLICY:
706 case IPV6_XFRM_POLICY:
707 retv = -EPERM;
708 if (!capable(CAP_NET_ADMIN))
709 break;
710 retv = xfrm_user_policy(sk, optname, optval, optlen);
711 break;
712
713 }
714 release_sock(sk);
715
716 return retv;
717
718 e_inval:
719 release_sock(sk);
720 return -EINVAL;
721 }
722
723 int ipv6_setsockopt(struct sock *sk, int level, int optname,
724 char __user *optval, int optlen)
725 {
726 int err;
727
728 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
729 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
730
731 if (level != SOL_IPV6)
732 return -ENOPROTOOPT;
733
734 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
735 #ifdef CONFIG_NETFILTER
736 /* we need to exclude all possible ENOPROTOOPTs except default case */
737 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
738 optname != IPV6_XFRM_POLICY) {
739 lock_sock(sk);
740 err = nf_setsockopt(sk, PF_INET6, optname, optval,
741 optlen);
742 release_sock(sk);
743 }
744 #endif
745 return err;
746 }
747
748
749 #ifdef CONFIG_COMPAT
750 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
751 char __user *optval, int optlen)
752 {
753 int err;
754
755 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
756 if (udp_prot.compat_setsockopt != NULL)
757 return udp_prot.compat_setsockopt(sk, level, optname,
758 optval, optlen);
759 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
760 }
761
762 if (level != SOL_IPV6)
763 return -ENOPROTOOPT;
764
765 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
766 #ifdef CONFIG_NETFILTER
767 /* we need to exclude all possible ENOPROTOOPTs except default case */
768 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
769 optname != IPV6_XFRM_POLICY) {
770 lock_sock(sk);
771 err = compat_nf_setsockopt(sk, PF_INET6, optname,
772 optval, optlen);
773 release_sock(sk);
774 }
775 #endif
776 return err;
777 }
778
779 EXPORT_SYMBOL(compat_ipv6_setsockopt);
780 #endif
781
782 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
783 char __user *optval, int len)
784 {
785 if (!hdr)
786 return 0;
787 len = min_t(int, len, ipv6_optlen(hdr));
788 if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
789 return -EFAULT;
790 return len;
791 }
792
793 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
794 char __user *optval, int __user *optlen)
795 {
796 struct ipv6_pinfo *np = inet6_sk(sk);
797 int len;
798 int val;
799
800 if (get_user(len, optlen))
801 return -EFAULT;
802 switch (optname) {
803 case IPV6_ADDRFORM:
804 if (sk->sk_protocol != IPPROTO_UDP &&
805 sk->sk_protocol != IPPROTO_TCP)
806 return -EINVAL;
807 if (sk->sk_state != TCP_ESTABLISHED)
808 return -ENOTCONN;
809 val = sk->sk_family;
810 break;
811 case MCAST_MSFILTER:
812 {
813 struct group_filter gsf;
814 int err;
815
816 if (len < GROUP_FILTER_SIZE(0))
817 return -EINVAL;
818 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
819 return -EFAULT;
820 lock_sock(sk);
821 err = ip6_mc_msfget(sk, &gsf,
822 (struct group_filter __user *)optval, optlen);
823 release_sock(sk);
824 return err;
825 }
826
827 case IPV6_2292PKTOPTIONS:
828 {
829 struct msghdr msg;
830 struct sk_buff *skb;
831
832 if (sk->sk_type != SOCK_STREAM)
833 return -ENOPROTOOPT;
834
835 msg.msg_control = optval;
836 msg.msg_controllen = len;
837 msg.msg_flags = 0;
838
839 lock_sock(sk);
840 skb = np->pktoptions;
841 if (skb)
842 atomic_inc(&skb->users);
843 release_sock(sk);
844
845 if (skb) {
846 int err = datagram_recv_ctl(sk, &msg, skb);
847 kfree_skb(skb);
848 if (err)
849 return err;
850 } else {
851 if (np->rxopt.bits.rxinfo) {
852 struct in6_pktinfo src_info;
853 src_info.ipi6_ifindex = np->mcast_oif;
854 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
855 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
856 }
857 if (np->rxopt.bits.rxhlim) {
858 int hlim = np->mcast_hops;
859 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
860 }
861 if (np->rxopt.bits.rxoinfo) {
862 struct in6_pktinfo src_info;
863 src_info.ipi6_ifindex = np->mcast_oif;
864 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
865 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
866 }
867 if (np->rxopt.bits.rxohlim) {
868 int hlim = np->mcast_hops;
869 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
870 }
871 }
872 len -= msg.msg_controllen;
873 return put_user(len, optlen);
874 }
875 case IPV6_MTU:
876 {
877 struct dst_entry *dst;
878 val = 0;
879 lock_sock(sk);
880 dst = sk_dst_get(sk);
881 if (dst) {
882 val = dst_mtu(dst);
883 dst_release(dst);
884 }
885 release_sock(sk);
886 if (!val)
887 return -ENOTCONN;
888 break;
889 }
890
891 case IPV6_V6ONLY:
892 val = np->ipv6only;
893 break;
894
895 case IPV6_RECVPKTINFO:
896 val = np->rxopt.bits.rxinfo;
897 break;
898
899 case IPV6_2292PKTINFO:
900 val = np->rxopt.bits.rxoinfo;
901 break;
902
903 case IPV6_RECVHOPLIMIT:
904 val = np->rxopt.bits.rxhlim;
905 break;
906
907 case IPV6_2292HOPLIMIT:
908 val = np->rxopt.bits.rxohlim;
909 break;
910
911 case IPV6_RECVRTHDR:
912 val = np->rxopt.bits.srcrt;
913 break;
914
915 case IPV6_2292RTHDR:
916 val = np->rxopt.bits.osrcrt;
917 break;
918
919 case IPV6_HOPOPTS:
920 case IPV6_RTHDRDSTOPTS:
921 case IPV6_RTHDR:
922 case IPV6_DSTOPTS:
923 {
924
925 lock_sock(sk);
926 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
927 optval, len);
928 release_sock(sk);
929 return put_user(len, optlen);
930 }
931
932 case IPV6_RECVHOPOPTS:
933 val = np->rxopt.bits.hopopts;
934 break;
935
936 case IPV6_2292HOPOPTS:
937 val = np->rxopt.bits.ohopopts;
938 break;
939
940 case IPV6_RECVDSTOPTS:
941 val = np->rxopt.bits.dstopts;
942 break;
943
944 case IPV6_2292DSTOPTS:
945 val = np->rxopt.bits.odstopts;
946 break;
947
948 case IPV6_TCLASS:
949 val = np->tclass;
950 if (val < 0)
951 val = 0;
952 break;
953
954 case IPV6_RECVTCLASS:
955 val = np->rxopt.bits.rxtclass;
956 break;
957
958 case IPV6_FLOWINFO:
959 val = np->rxopt.bits.rxflow;
960 break;
961
962 case IPV6_UNICAST_HOPS:
963 val = np->hop_limit;
964 break;
965
966 case IPV6_MULTICAST_HOPS:
967 val = np->mcast_hops;
968 break;
969
970 case IPV6_MULTICAST_LOOP:
971 val = np->mc_loop;
972 break;
973
974 case IPV6_MULTICAST_IF:
975 val = np->mcast_oif;
976 break;
977
978 case IPV6_MTU_DISCOVER:
979 val = np->pmtudisc;
980 break;
981
982 case IPV6_RECVERR:
983 val = np->recverr;
984 break;
985
986 case IPV6_FLOWINFO_SEND:
987 val = np->sndflow;
988 break;
989
990 default:
991 return -EINVAL;
992 }
993 len = min_t(unsigned int, sizeof(int), len);
994 if(put_user(len, optlen))
995 return -EFAULT;
996 if(copy_to_user(optval,&val,len))
997 return -EFAULT;
998 return 0;
999 }
1000
1001 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1002 char __user *optval, int __user *optlen)
1003 {
1004 int err;
1005
1006 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1007 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1008
1009 if(level != SOL_IPV6)
1010 return -ENOPROTOOPT;
1011
1012 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1013 #ifdef CONFIG_NETFILTER
1014 /* we need to exclude all possible EINVALs except default case */
1015 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1016 optname != MCAST_MSFILTER) {
1017 int len;
1018
1019 if (get_user(len, optlen))
1020 return -EFAULT;
1021
1022 lock_sock(sk);
1023 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1024 &len);
1025 release_sock(sk);
1026 if (err >= 0)
1027 err = put_user(len, optlen);
1028 }
1029 #endif
1030 return err;
1031 }
1032
1033 #ifdef CONFIG_COMPAT
1034 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1035 char __user *optval, int __user *optlen)
1036 {
1037 int err;
1038
1039 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1040 if (udp_prot.compat_getsockopt != NULL)
1041 return udp_prot.compat_getsockopt(sk, level, optname,
1042 optval, optlen);
1043 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1044 }
1045
1046 if (level != SOL_IPV6)
1047 return -ENOPROTOOPT;
1048
1049 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1050 #ifdef CONFIG_NETFILTER
1051 /* we need to exclude all possible EINVALs except default case */
1052 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1053 optname != MCAST_MSFILTER) {
1054 int len;
1055
1056 if (get_user(len, optlen))
1057 return -EFAULT;
1058
1059 lock_sock(sk);
1060 err = compat_nf_getsockopt(sk, PF_INET6,
1061 optname, optval, &len);
1062 release_sock(sk);
1063 if (err >= 0)
1064 err = put_user(len, optlen);
1065 }
1066 #endif
1067 return err;
1068 }
1069
1070 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1071 #endif
1072
1073 void __init ipv6_packet_init(void)
1074 {
1075 dev_add_pack(&ipv6_packet_type);
1076 }
1077
1078 void ipv6_packet_cleanup(void)
1079 {
1080 dev_remove_pack(&ipv6_packet_type);
1081 }
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