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/net.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/init.h>
39 #include <linux/sysctl.h>
40 #include <linux/netfilter.h>
41
42 #include <net/sock.h>
43 #include <net/snmp.h>
44 #include <net/ipv6.h>
45 #include <net/ndisc.h>
46 #include <net/protocol.h>
47 #include <net/transp_v6.h>
48 #include <net/ip6_route.h>
49 #include <net/addrconf.h>
50 #include <net/inet_common.h>
51 #include <net/tcp.h>
52 #include <net/udp.h>
53 #include <net/udplite.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 = ipv6_hdr(skb);
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_reset_transport_header(skb);
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 (!(features & NETIF_F_V6_CSUM))
127 features &= ~NETIF_F_SG;
128
129 if (unlikely(skb_shinfo(skb)->gso_type &
130 ~(SKB_GSO_UDP |
131 SKB_GSO_DODGY |
132 SKB_GSO_TCP_ECN |
133 SKB_GSO_TCPV6 |
134 0)))
135 goto out;
136
137 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
138 goto out;
139
140 ipv6h = ipv6_hdr(skb);
141 __skb_pull(skb, sizeof(*ipv6h));
142 segs = ERR_PTR(-EPROTONOSUPPORT);
143
144 rcu_read_lock();
145 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
146 if (likely(ops && ops->gso_segment)) {
147 skb_reset_transport_header(skb);
148 segs = ops->gso_segment(skb, features);
149 }
150 rcu_read_unlock();
151
152 if (unlikely(IS_ERR(segs)))
153 goto out;
154
155 for (skb = segs; skb; skb = skb->next) {
156 ipv6h = ipv6_hdr(skb);
157 ipv6h->payload_len = htons(skb->len - skb->mac_len -
158 sizeof(*ipv6h));
159 }
160
161 out:
162 return segs;
163 }
164
165 static struct packet_type ipv6_packet_type = {
166 .type = __constant_htons(ETH_P_IPV6),
167 .func = ipv6_rcv,
168 .gso_send_check = ipv6_gso_send_check,
169 .gso_segment = ipv6_gso_segment,
170 };
171
172 struct ip6_ra_chain *ip6_ra_chain;
173 DEFINE_RWLOCK(ip6_ra_lock);
174
175 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
176 {
177 struct ip6_ra_chain *ra, *new_ra, **rap;
178
179 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
180 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
181 return -EINVAL;
182
183 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
184
185 write_lock_bh(&ip6_ra_lock);
186 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
187 if (ra->sk == sk) {
188 if (sel>=0) {
189 write_unlock_bh(&ip6_ra_lock);
190 kfree(new_ra);
191 return -EADDRINUSE;
192 }
193
194 *rap = ra->next;
195 write_unlock_bh(&ip6_ra_lock);
196
197 if (ra->destructor)
198 ra->destructor(sk);
199 sock_put(sk);
200 kfree(ra);
201 return 0;
202 }
203 }
204 if (new_ra == NULL) {
205 write_unlock_bh(&ip6_ra_lock);
206 return -ENOBUFS;
207 }
208 new_ra->sk = sk;
209 new_ra->sel = sel;
210 new_ra->destructor = destructor;
211 new_ra->next = ra;
212 *rap = new_ra;
213 sock_hold(sk);
214 write_unlock_bh(&ip6_ra_lock);
215 return 0;
216 }
217
218 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
219 char __user *optval, int optlen)
220 {
221 struct ipv6_pinfo *np = inet6_sk(sk);
222 int val, valbool;
223 int retv = -ENOPROTOOPT;
224
225 if (optval == NULL)
226 val=0;
227 else if (get_user(val, (int __user *) optval))
228 return -EFAULT;
229
230 valbool = (val!=0);
231
232 lock_sock(sk);
233
234 switch (optname) {
235
236 case IPV6_ADDRFORM:
237 if (val == PF_INET) {
238 struct ipv6_txoptions *opt;
239 struct sk_buff *pktopt;
240
241 if (sk->sk_protocol != IPPROTO_UDP &&
242 sk->sk_protocol != IPPROTO_UDPLITE &&
243 sk->sk_protocol != IPPROTO_TCP)
244 break;
245
246 if (sk->sk_state != TCP_ESTABLISHED) {
247 retv = -ENOTCONN;
248 break;
249 }
250
251 if (ipv6_only_sock(sk) ||
252 !ipv6_addr_v4mapped(&np->daddr)) {
253 retv = -EADDRNOTAVAIL;
254 break;
255 }
256
257 fl6_free_socklist(sk);
258 ipv6_sock_mc_close(sk);
259
260 /*
261 * Sock is moving from IPv6 to IPv4 (sk_prot), so
262 * remove it from the refcnt debug socks count in the
263 * original family...
264 */
265 sk_refcnt_debug_dec(sk);
266
267 if (sk->sk_protocol == IPPROTO_TCP) {
268 struct inet_connection_sock *icsk = inet_csk(sk);
269
270 local_bh_disable();
271 sock_prot_inuse_add(sk->sk_prot, -1);
272 sock_prot_inuse_add(&tcp_prot, 1);
273 local_bh_enable();
274 sk->sk_prot = &tcp_prot;
275 icsk->icsk_af_ops = &ipv4_specific;
276 sk->sk_socket->ops = &inet_stream_ops;
277 sk->sk_family = PF_INET;
278 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
279 } else {
280 struct proto *prot = &udp_prot;
281
282 if (sk->sk_protocol == IPPROTO_UDPLITE)
283 prot = &udplite_prot;
284 local_bh_disable();
285 sock_prot_inuse_add(sk->sk_prot, -1);
286 sock_prot_inuse_add(prot, 1);
287 local_bh_enable();
288 sk->sk_prot = prot;
289 sk->sk_socket->ops = &inet_dgram_ops;
290 sk->sk_family = PF_INET;
291 }
292 opt = xchg(&np->opt, NULL);
293 if (opt)
294 sock_kfree_s(sk, opt, opt->tot_len);
295 pktopt = xchg(&np->pktoptions, NULL);
296 if (pktopt)
297 kfree_skb(pktopt);
298
299 sk->sk_destruct = inet_sock_destruct;
300 /*
301 * ... and add it to the refcnt debug socks count
302 * in the new family. -acme
303 */
304 sk_refcnt_debug_inc(sk);
305 module_put(THIS_MODULE);
306 retv = 0;
307 break;
308 }
309 goto e_inval;
310
311 case IPV6_V6ONLY:
312 if (inet_sk(sk)->num)
313 goto e_inval;
314 np->ipv6only = valbool;
315 retv = 0;
316 break;
317
318 case IPV6_RECVPKTINFO:
319 np->rxopt.bits.rxinfo = valbool;
320 retv = 0;
321 break;
322
323 case IPV6_2292PKTINFO:
324 np->rxopt.bits.rxoinfo = valbool;
325 retv = 0;
326 break;
327
328 case IPV6_RECVHOPLIMIT:
329 np->rxopt.bits.rxhlim = valbool;
330 retv = 0;
331 break;
332
333 case IPV6_2292HOPLIMIT:
334 np->rxopt.bits.rxohlim = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_RECVRTHDR:
339 np->rxopt.bits.srcrt = valbool;
340 retv = 0;
341 break;
342
343 case IPV6_2292RTHDR:
344 np->rxopt.bits.osrcrt = valbool;
345 retv = 0;
346 break;
347
348 case IPV6_RECVHOPOPTS:
349 np->rxopt.bits.hopopts = valbool;
350 retv = 0;
351 break;
352
353 case IPV6_2292HOPOPTS:
354 np->rxopt.bits.ohopopts = valbool;
355 retv = 0;
356 break;
357
358 case IPV6_RECVDSTOPTS:
359 np->rxopt.bits.dstopts = valbool;
360 retv = 0;
361 break;
362
363 case IPV6_2292DSTOPTS:
364 np->rxopt.bits.odstopts = valbool;
365 retv = 0;
366 break;
367
368 case IPV6_TCLASS:
369 if (val < -1 || val > 0xff)
370 goto e_inval;
371 np->tclass = val;
372 retv = 0;
373 break;
374
375 case IPV6_RECVTCLASS:
376 np->rxopt.bits.rxtclass = valbool;
377 retv = 0;
378 break;
379
380 case IPV6_FLOWINFO:
381 np->rxopt.bits.rxflow = valbool;
382 retv = 0;
383 break;
384
385 case IPV6_HOPOPTS:
386 case IPV6_RTHDRDSTOPTS:
387 case IPV6_RTHDR:
388 case IPV6_DSTOPTS:
389 {
390 struct ipv6_txoptions *opt;
391 if (optlen == 0)
392 optval = NULL;
393
394 /* hop-by-hop / destination options are privileged option */
395 retv = -EPERM;
396 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
397 break;
398
399 retv = -EINVAL;
400 if (optlen & 0x7 || optlen > 8 * 255)
401 break;
402
403 opt = ipv6_renew_options(sk, np->opt, optname,
404 (struct ipv6_opt_hdr __user *)optval,
405 optlen);
406 if (IS_ERR(opt)) {
407 retv = PTR_ERR(opt);
408 break;
409 }
410
411 /* routing header option needs extra check */
412 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
413 struct ipv6_rt_hdr *rthdr = opt->srcrt;
414 switch (rthdr->type) {
415 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
416 case IPV6_SRCRT_TYPE_2:
417 break;
418 #endif
419 default:
420 goto sticky_done;
421 }
422
423 if ((rthdr->hdrlen & 1) ||
424 (rthdr->hdrlen >> 1) != rthdr->segments_left)
425 goto sticky_done;
426 }
427
428 retv = 0;
429 if (inet_sk(sk)->is_icsk) {
430 if (opt) {
431 struct inet_connection_sock *icsk = inet_csk(sk);
432 if (!((1 << sk->sk_state) &
433 (TCPF_LISTEN | TCPF_CLOSE))
434 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
435 icsk->icsk_ext_hdr_len =
436 opt->opt_flen + opt->opt_nflen;
437 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
438 }
439 }
440 opt = xchg(&np->opt, opt);
441 sk_dst_reset(sk);
442 } else {
443 write_lock(&sk->sk_dst_lock);
444 opt = xchg(&np->opt, opt);
445 write_unlock(&sk->sk_dst_lock);
446 sk_dst_reset(sk);
447 }
448 sticky_done:
449 if (opt)
450 sock_kfree_s(sk, opt, opt->tot_len);
451 break;
452 }
453
454 case IPV6_2292PKTOPTIONS:
455 {
456 struct ipv6_txoptions *opt = NULL;
457 struct msghdr msg;
458 struct flowi fl;
459 int junk;
460
461 fl.fl6_flowlabel = 0;
462 fl.oif = sk->sk_bound_dev_if;
463
464 if (optlen == 0)
465 goto update;
466
467 /* 1K is probably excessive
468 * 1K is surely not enough, 2K per standard header is 16K.
469 */
470 retv = -EINVAL;
471 if (optlen > 64*1024)
472 break;
473
474 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
475 retv = -ENOBUFS;
476 if (opt == NULL)
477 break;
478
479 memset(opt, 0, sizeof(*opt));
480 opt->tot_len = sizeof(*opt) + optlen;
481 retv = -EFAULT;
482 if (copy_from_user(opt+1, optval, optlen))
483 goto done;
484
485 msg.msg_controllen = optlen;
486 msg.msg_control = (void*)(opt+1);
487
488 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
489 if (retv)
490 goto done;
491 update:
492 retv = 0;
493 if (inet_sk(sk)->is_icsk) {
494 if (opt) {
495 struct inet_connection_sock *icsk = inet_csk(sk);
496 if (!((1 << sk->sk_state) &
497 (TCPF_LISTEN | TCPF_CLOSE))
498 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
499 icsk->icsk_ext_hdr_len =
500 opt->opt_flen + opt->opt_nflen;
501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
502 }
503 }
504 opt = xchg(&np->opt, opt);
505 sk_dst_reset(sk);
506 } else {
507 write_lock(&sk->sk_dst_lock);
508 opt = xchg(&np->opt, opt);
509 write_unlock(&sk->sk_dst_lock);
510 sk_dst_reset(sk);
511 }
512
513 done:
514 if (opt)
515 sock_kfree_s(sk, opt, opt->tot_len);
516 break;
517 }
518 case IPV6_UNICAST_HOPS:
519 if (val > 255 || val < -1)
520 goto e_inval;
521 np->hop_limit = val;
522 retv = 0;
523 break;
524
525 case IPV6_MULTICAST_HOPS:
526 if (sk->sk_type == SOCK_STREAM)
527 goto e_inval;
528 if (val > 255 || val < -1)
529 goto e_inval;
530 np->mcast_hops = val;
531 retv = 0;
532 break;
533
534 case IPV6_MULTICAST_LOOP:
535 np->mc_loop = valbool;
536 retv = 0;
537 break;
538
539 case IPV6_MULTICAST_IF:
540 if (sk->sk_type == SOCK_STREAM)
541 goto e_inval;
542
543 if (val) {
544 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
545 goto e_inval;
546
547 if (__dev_get_by_index(&init_net, val) == NULL) {
548 retv = -ENODEV;
549 break;
550 }
551 }
552 np->mcast_oif = val;
553 retv = 0;
554 break;
555 case IPV6_ADD_MEMBERSHIP:
556 case IPV6_DROP_MEMBERSHIP:
557 {
558 struct ipv6_mreq mreq;
559
560 retv = -EPROTO;
561 if (inet_sk(sk)->is_icsk)
562 break;
563
564 retv = -EFAULT;
565 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
566 break;
567
568 if (optname == IPV6_ADD_MEMBERSHIP)
569 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
570 else
571 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
572 break;
573 }
574 case IPV6_JOIN_ANYCAST:
575 case IPV6_LEAVE_ANYCAST:
576 {
577 struct ipv6_mreq mreq;
578
579 if (optlen != sizeof(struct ipv6_mreq))
580 goto e_inval;
581
582 retv = -EFAULT;
583 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
584 break;
585
586 if (optname == IPV6_JOIN_ANYCAST)
587 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
588 else
589 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
590 break;
591 }
592 case MCAST_JOIN_GROUP:
593 case MCAST_LEAVE_GROUP:
594 {
595 struct group_req greq;
596 struct sockaddr_in6 *psin6;
597
598 retv = -EFAULT;
599 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
600 break;
601 if (greq.gr_group.ss_family != AF_INET6) {
602 retv = -EADDRNOTAVAIL;
603 break;
604 }
605 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
606 if (optname == MCAST_JOIN_GROUP)
607 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
608 &psin6->sin6_addr);
609 else
610 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
611 &psin6->sin6_addr);
612 break;
613 }
614 case MCAST_JOIN_SOURCE_GROUP:
615 case MCAST_LEAVE_SOURCE_GROUP:
616 case MCAST_BLOCK_SOURCE:
617 case MCAST_UNBLOCK_SOURCE:
618 {
619 struct group_source_req greqs;
620 int omode, add;
621
622 if (optlen != sizeof(struct group_source_req))
623 goto e_inval;
624 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
625 retv = -EFAULT;
626 break;
627 }
628 if (greqs.gsr_group.ss_family != AF_INET6 ||
629 greqs.gsr_source.ss_family != AF_INET6) {
630 retv = -EADDRNOTAVAIL;
631 break;
632 }
633 if (optname == MCAST_BLOCK_SOURCE) {
634 omode = MCAST_EXCLUDE;
635 add = 1;
636 } else if (optname == MCAST_UNBLOCK_SOURCE) {
637 omode = MCAST_EXCLUDE;
638 add = 0;
639 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
640 struct sockaddr_in6 *psin6;
641
642 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
643 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
644 &psin6->sin6_addr);
645 /* prior join w/ different source is ok */
646 if (retv && retv != -EADDRINUSE)
647 break;
648 omode = MCAST_INCLUDE;
649 add = 1;
650 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
651 omode = MCAST_INCLUDE;
652 add = 0;
653 }
654 retv = ip6_mc_source(add, omode, sk, &greqs);
655 break;
656 }
657 case MCAST_MSFILTER:
658 {
659 extern int sysctl_mld_max_msf;
660 struct group_filter *gsf;
661
662 if (optlen < GROUP_FILTER_SIZE(0))
663 goto e_inval;
664 if (optlen > sysctl_optmem_max) {
665 retv = -ENOBUFS;
666 break;
667 }
668 gsf = kmalloc(optlen,GFP_KERNEL);
669 if (!gsf) {
670 retv = -ENOBUFS;
671 break;
672 }
673 retv = -EFAULT;
674 if (copy_from_user(gsf, optval, optlen)) {
675 kfree(gsf);
676 break;
677 }
678 /* numsrc >= (4G-140)/128 overflow in 32 bits */
679 if (gsf->gf_numsrc >= 0x1ffffffU ||
680 gsf->gf_numsrc > sysctl_mld_max_msf) {
681 kfree(gsf);
682 retv = -ENOBUFS;
683 break;
684 }
685 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
686 kfree(gsf);
687 retv = -EINVAL;
688 break;
689 }
690 retv = ip6_mc_msfilter(sk, gsf);
691 kfree(gsf);
692
693 break;
694 }
695 case IPV6_ROUTER_ALERT:
696 retv = ip6_ra_control(sk, val, NULL);
697 break;
698 case IPV6_MTU_DISCOVER:
699 if (val<0 || val>3)
700 goto e_inval;
701 np->pmtudisc = val;
702 retv = 0;
703 break;
704 case IPV6_MTU:
705 if (val && val < IPV6_MIN_MTU)
706 goto e_inval;
707 np->frag_size = val;
708 retv = 0;
709 break;
710 case IPV6_RECVERR:
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 np->sndflow = valbool;
718 retv = 0;
719 break;
720 case IPV6_FLOWLABEL_MGR:
721 retv = ipv6_flowlabel_opt(sk, optval, optlen);
722 break;
723 case IPV6_IPSEC_POLICY:
724 case IPV6_XFRM_POLICY:
725 retv = -EPERM;
726 if (!capable(CAP_NET_ADMIN))
727 break;
728 retv = xfrm_user_policy(sk, optname, optval, optlen);
729 break;
730
731 }
732 release_sock(sk);
733
734 return retv;
735
736 e_inval:
737 release_sock(sk);
738 return -EINVAL;
739 }
740
741 int ipv6_setsockopt(struct sock *sk, int level, int optname,
742 char __user *optval, int optlen)
743 {
744 int err;
745
746 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
747 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
748
749 if (level != SOL_IPV6)
750 return -ENOPROTOOPT;
751
752 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
753 #ifdef CONFIG_NETFILTER
754 /* we need to exclude all possible ENOPROTOOPTs except default case */
755 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
756 optname != IPV6_XFRM_POLICY) {
757 lock_sock(sk);
758 err = nf_setsockopt(sk, PF_INET6, optname, optval,
759 optlen);
760 release_sock(sk);
761 }
762 #endif
763 return err;
764 }
765
766 EXPORT_SYMBOL(ipv6_setsockopt);
767
768 #ifdef CONFIG_COMPAT
769 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
770 char __user *optval, int optlen)
771 {
772 int err;
773
774 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
775 if (udp_prot.compat_setsockopt != NULL)
776 return udp_prot.compat_setsockopt(sk, level, optname,
777 optval, optlen);
778 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
779 }
780
781 if (level != SOL_IPV6)
782 return -ENOPROTOOPT;
783
784 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
785 #ifdef CONFIG_NETFILTER
786 /* we need to exclude all possible ENOPROTOOPTs except default case */
787 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
788 optname != IPV6_XFRM_POLICY) {
789 lock_sock(sk);
790 err = compat_nf_setsockopt(sk, PF_INET6, optname,
791 optval, optlen);
792 release_sock(sk);
793 }
794 #endif
795 return err;
796 }
797
798 EXPORT_SYMBOL(compat_ipv6_setsockopt);
799 #endif
800
801 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
802 int optname, char __user *optval, int len)
803 {
804 struct ipv6_opt_hdr *hdr;
805
806 if (!opt)
807 return 0;
808
809 switch(optname) {
810 case IPV6_HOPOPTS:
811 hdr = opt->hopopt;
812 break;
813 case IPV6_RTHDRDSTOPTS:
814 hdr = opt->dst0opt;
815 break;
816 case IPV6_RTHDR:
817 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
818 break;
819 case IPV6_DSTOPTS:
820 hdr = opt->dst1opt;
821 break;
822 default:
823 return -EINVAL; /* should not happen */
824 }
825
826 if (!hdr)
827 return 0;
828
829 len = min_t(unsigned int, len, ipv6_optlen(hdr));
830 if (copy_to_user(optval, hdr, len))
831 return -EFAULT;
832 return ipv6_optlen(hdr);
833 }
834
835 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
836 char __user *optval, int __user *optlen)
837 {
838 struct ipv6_pinfo *np = inet6_sk(sk);
839 int len;
840 int val;
841
842 if (get_user(len, optlen))
843 return -EFAULT;
844 switch (optname) {
845 case IPV6_ADDRFORM:
846 if (sk->sk_protocol != IPPROTO_UDP &&
847 sk->sk_protocol != IPPROTO_UDPLITE &&
848 sk->sk_protocol != IPPROTO_TCP)
849 return -EINVAL;
850 if (sk->sk_state != TCP_ESTABLISHED)
851 return -ENOTCONN;
852 val = sk->sk_family;
853 break;
854 case MCAST_MSFILTER:
855 {
856 struct group_filter gsf;
857 int err;
858
859 if (len < GROUP_FILTER_SIZE(0))
860 return -EINVAL;
861 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
862 return -EFAULT;
863 lock_sock(sk);
864 err = ip6_mc_msfget(sk, &gsf,
865 (struct group_filter __user *)optval, optlen);
866 release_sock(sk);
867 return err;
868 }
869
870 case IPV6_2292PKTOPTIONS:
871 {
872 struct msghdr msg;
873 struct sk_buff *skb;
874
875 if (sk->sk_type != SOCK_STREAM)
876 return -ENOPROTOOPT;
877
878 msg.msg_control = optval;
879 msg.msg_controllen = len;
880 msg.msg_flags = 0;
881
882 lock_sock(sk);
883 skb = np->pktoptions;
884 if (skb)
885 atomic_inc(&skb->users);
886 release_sock(sk);
887
888 if (skb) {
889 int err = datagram_recv_ctl(sk, &msg, skb);
890 kfree_skb(skb);
891 if (err)
892 return err;
893 } else {
894 if (np->rxopt.bits.rxinfo) {
895 struct in6_pktinfo src_info;
896 src_info.ipi6_ifindex = np->mcast_oif;
897 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
898 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
899 }
900 if (np->rxopt.bits.rxhlim) {
901 int hlim = np->mcast_hops;
902 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
903 }
904 if (np->rxopt.bits.rxoinfo) {
905 struct in6_pktinfo src_info;
906 src_info.ipi6_ifindex = np->mcast_oif;
907 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
908 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
909 }
910 if (np->rxopt.bits.rxohlim) {
911 int hlim = np->mcast_hops;
912 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
913 }
914 }
915 len -= msg.msg_controllen;
916 return put_user(len, optlen);
917 }
918 case IPV6_MTU:
919 {
920 struct dst_entry *dst;
921 val = 0;
922 lock_sock(sk);
923 dst = sk_dst_get(sk);
924 if (dst) {
925 val = dst_mtu(dst);
926 dst_release(dst);
927 }
928 release_sock(sk);
929 if (!val)
930 return -ENOTCONN;
931 break;
932 }
933
934 case IPV6_V6ONLY:
935 val = np->ipv6only;
936 break;
937
938 case IPV6_RECVPKTINFO:
939 val = np->rxopt.bits.rxinfo;
940 break;
941
942 case IPV6_2292PKTINFO:
943 val = np->rxopt.bits.rxoinfo;
944 break;
945
946 case IPV6_RECVHOPLIMIT:
947 val = np->rxopt.bits.rxhlim;
948 break;
949
950 case IPV6_2292HOPLIMIT:
951 val = np->rxopt.bits.rxohlim;
952 break;
953
954 case IPV6_RECVRTHDR:
955 val = np->rxopt.bits.srcrt;
956 break;
957
958 case IPV6_2292RTHDR:
959 val = np->rxopt.bits.osrcrt;
960 break;
961
962 case IPV6_HOPOPTS:
963 case IPV6_RTHDRDSTOPTS:
964 case IPV6_RTHDR:
965 case IPV6_DSTOPTS:
966 {
967
968 lock_sock(sk);
969 len = ipv6_getsockopt_sticky(sk, np->opt,
970 optname, optval, len);
971 release_sock(sk);
972 return put_user(len, optlen);
973 }
974
975 case IPV6_RECVHOPOPTS:
976 val = np->rxopt.bits.hopopts;
977 break;
978
979 case IPV6_2292HOPOPTS:
980 val = np->rxopt.bits.ohopopts;
981 break;
982
983 case IPV6_RECVDSTOPTS:
984 val = np->rxopt.bits.dstopts;
985 break;
986
987 case IPV6_2292DSTOPTS:
988 val = np->rxopt.bits.odstopts;
989 break;
990
991 case IPV6_TCLASS:
992 val = np->tclass;
993 if (val < 0)
994 val = 0;
995 break;
996
997 case IPV6_RECVTCLASS:
998 val = np->rxopt.bits.rxtclass;
999 break;
1000
1001 case IPV6_FLOWINFO:
1002 val = np->rxopt.bits.rxflow;
1003 break;
1004
1005 case IPV6_UNICAST_HOPS:
1006 case IPV6_MULTICAST_HOPS:
1007 {
1008 struct dst_entry *dst;
1009
1010 if (optname == IPV6_UNICAST_HOPS)
1011 val = np->hop_limit;
1012 else
1013 val = np->mcast_hops;
1014
1015 dst = sk_dst_get(sk);
1016 if (dst) {
1017 if (val < 0)
1018 val = dst_metric(dst, RTAX_HOPLIMIT);
1019 if (val < 0)
1020 val = ipv6_get_hoplimit(dst->dev);
1021 dst_release(dst);
1022 }
1023 if (val < 0)
1024 val = ipv6_devconf.hop_limit;
1025 break;
1026 }
1027
1028 case IPV6_MULTICAST_LOOP:
1029 val = np->mc_loop;
1030 break;
1031
1032 case IPV6_MULTICAST_IF:
1033 val = np->mcast_oif;
1034 break;
1035
1036 case IPV6_MTU_DISCOVER:
1037 val = np->pmtudisc;
1038 break;
1039
1040 case IPV6_RECVERR:
1041 val = np->recverr;
1042 break;
1043
1044 case IPV6_FLOWINFO_SEND:
1045 val = np->sndflow;
1046 break;
1047
1048 default:
1049 return -ENOPROTOOPT;
1050 }
1051 len = min_t(unsigned int, sizeof(int), len);
1052 if(put_user(len, optlen))
1053 return -EFAULT;
1054 if(copy_to_user(optval,&val,len))
1055 return -EFAULT;
1056 return 0;
1057 }
1058
1059 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1060 char __user *optval, int __user *optlen)
1061 {
1062 int err;
1063
1064 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1065 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1066
1067 if(level != SOL_IPV6)
1068 return -ENOPROTOOPT;
1069
1070 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1071 #ifdef CONFIG_NETFILTER
1072 /* we need to exclude all possible ENOPROTOOPTs except default case */
1073 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1074 int len;
1075
1076 if (get_user(len, optlen))
1077 return -EFAULT;
1078
1079 lock_sock(sk);
1080 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1081 &len);
1082 release_sock(sk);
1083 if (err >= 0)
1084 err = put_user(len, optlen);
1085 }
1086 #endif
1087 return err;
1088 }
1089
1090 EXPORT_SYMBOL(ipv6_getsockopt);
1091
1092 #ifdef CONFIG_COMPAT
1093 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1094 char __user *optval, int __user *optlen)
1095 {
1096 int err;
1097
1098 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1099 if (udp_prot.compat_getsockopt != NULL)
1100 return udp_prot.compat_getsockopt(sk, level, optname,
1101 optval, optlen);
1102 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1103 }
1104
1105 if (level != SOL_IPV6)
1106 return -ENOPROTOOPT;
1107
1108 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1109 #ifdef CONFIG_NETFILTER
1110 /* we need to exclude all possible ENOPROTOOPTs except default case */
1111 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1112 int len;
1113
1114 if (get_user(len, optlen))
1115 return -EFAULT;
1116
1117 lock_sock(sk);
1118 err = compat_nf_getsockopt(sk, PF_INET6,
1119 optname, optval, &len);
1120 release_sock(sk);
1121 if (err >= 0)
1122 err = put_user(len, optlen);
1123 }
1124 #endif
1125 return err;
1126 }
1127
1128 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1129 #endif
1130
1131 int __init ipv6_packet_init(void)
1132 {
1133 dev_add_pack(&ipv6_packet_type);
1134 return 0;
1135 }
1136
1137 void ipv6_packet_cleanup(void)
1138 {
1139 dev_remove_pack(&ipv6_packet_type);
1140 }
1141
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