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[IPVS]: Add sysctl documentation
[deliverable/linux.git] / net / ipv6 / ipv6_sockglue.c
CommitLineData
1da177e4
LT		 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>
4fc268d2 29#include <linux/capability.h>
1da177e4
LT		 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
ba89966c 58DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
1da177e4 59
adcfc7d0
HX		 60static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
61{
62 struct sk_buff *segs = ERR_PTR(-EINVAL);
63 struct ipv6hdr *ipv6h;
64 struct inet6_protocol *ops;
65 int proto;
66
67 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
68 goto out;
69
70 ipv6h = skb->nh.ipv6h;
71 proto = ipv6h->nexthdr;
72 __skb_pull(skb, sizeof(*ipv6h));
73
74 rcu_read_lock();
75 for (;;) {
76 struct ipv6_opt_hdr *opth;
77 int len;
78
79 if (proto != NEXTHDR_HOP) {
80 ops = rcu_dereference(inet6_protos[proto]);
81
82 if (unlikely(!ops))
83 goto unlock;
84
85 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
86 break;
87 }
88
89 if (unlikely(!pskb_may_pull(skb, 8)))
90 goto unlock;
91
92 opth = (void *)skb->data;
93 len = opth->hdrlen * 8 + 8;
94
95 if (unlikely(!pskb_may_pull(skb, len)))
96 goto unlock;
97
98 proto = opth->nexthdr;
99 __skb_pull(skb, len);
100 }
101
102 skb->h.raw = skb->data;
103 if (likely(ops->gso_segment))
104 segs = ops->gso_segment(skb, features);
105
106unlock:
107 rcu_read_unlock();
108
109 if (unlikely(IS_ERR(segs)))
110 goto out;
111
112 for (skb = segs; skb; skb = skb->next) {
113 ipv6h = skb->nh.ipv6h;
114 ipv6h->payload_len = htons(skb->len - skb->mac_len);
115 }
116
117out:
118 return segs;
119}
120
1da177e4
LT		 121static struct packet_type ipv6_packet_type = {
122 .type = __constant_htons(ETH_P_IPV6),
123 .func = ipv6_rcv,
adcfc7d0 124 .gso_segment = ipv6_gso_segment,
1da177e4
LT		 125};
126
127struct ip6_ra_chain *ip6_ra_chain;
128DEFINE_RWLOCK(ip6_ra_lock);
129
130int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
131{
132 struct ip6_ra_chain *ra, *new_ra, **rap;
133
134 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
135 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
136 return -EINVAL;
137
138 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
139
140 write_lock_bh(&ip6_ra_lock);
141 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
142 if (ra->sk == sk) {
143 if (sel>=0) {
144 write_unlock_bh(&ip6_ra_lock);
a51482bd 145 kfree(new_ra);
1da177e4
LT		 146 return -EADDRINUSE;
147 }
148
149 *rap = ra->next;
150 write_unlock_bh(&ip6_ra_lock);
151
152 if (ra->destructor)
153 ra->destructor(sk);
154 sock_put(sk);
155 kfree(ra);
156 return 0;
157 }
158 }
159 if (new_ra == NULL) {
160 write_unlock_bh(&ip6_ra_lock);
161 return -ENOBUFS;
162 }
163 new_ra->sk = sk;
164 new_ra->sel = sel;
165 new_ra->destructor = destructor;
166 new_ra->next = ra;
167 *rap = new_ra;
168 sock_hold(sk);
169 write_unlock_bh(&ip6_ra_lock);
170 return 0;
171}
172
3fdadf7d 173static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 174 char __user *optval, int optlen)
175{
176 struct ipv6_pinfo *np = inet6_sk(sk);
177 int val, valbool;
178 int retv = -ENOPROTOOPT;
179
1da177e4
LT		 180 if (optval == NULL)
181 val=0;
182 else if (get_user(val, (int __user *) optval))
183 return -EFAULT;
184
185 valbool = (val!=0);
186
187 lock_sock(sk);
188
189 switch (optname) {
190
191 case IPV6_ADDRFORM:
192 if (val == PF_INET) {
193 struct ipv6_txoptions *opt;
194 struct sk_buff *pktopt;
195
196 if (sk->sk_protocol != IPPROTO_UDP &&
197 sk->sk_protocol != IPPROTO_TCP)
198 break;
199
200 if (sk->sk_state != TCP_ESTABLISHED) {
201 retv = -ENOTCONN;
202 break;
203 }
204
205 if (ipv6_only_sock(sk) ||
206 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
207 retv = -EADDRNOTAVAIL;
208 break;
209 }
210
211 fl6_free_socklist(sk);
212 ipv6_sock_mc_close(sk);
213
e6848976
ACM		 214 /*
215 * Sock is moving from IPv6 to IPv4 (sk_prot), so
216 * remove it from the refcnt debug socks count in the
217 * original family...
218 */
219 sk_refcnt_debug_dec(sk);
220
1da177e4 221 if (sk->sk_protocol == IPPROTO_TCP) {
d83d8461 222 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 223
224 local_bh_disable();
225 sock_prot_dec_use(sk->sk_prot);
226 sock_prot_inc_use(&tcp_prot);
227 local_bh_enable();
228 sk->sk_prot = &tcp_prot;
d83d8461 229 icsk->icsk_af_ops = &ipv4_specific;
1da177e4
LT		 230 sk->sk_socket->ops = &inet_stream_ops;
231 sk->sk_family = PF_INET;
d83d8461 232 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4
LT		 233 } else {
234 local_bh_disable();
235 sock_prot_dec_use(sk->sk_prot);
236 sock_prot_inc_use(&udp_prot);
237 local_bh_enable();
238 sk->sk_prot = &udp_prot;
239 sk->sk_socket->ops = &inet_dgram_ops;
240 sk->sk_family = PF_INET;
241 }
242 opt = xchg(&np->opt, NULL);
243 if (opt)
244 sock_kfree_s(sk, opt, opt->tot_len);
245 pktopt = xchg(&np->pktoptions, NULL);
246 if (pktopt)
247 kfree_skb(pktopt);
248
249 sk->sk_destruct = inet_sock_destruct;
e6848976
ACM		 250 /*
251 * ... and add it to the refcnt debug socks count
252 * in the new family. -acme
253 */
254 sk_refcnt_debug_inc(sk);
1da177e4
LT		 255 module_put(THIS_MODULE);
256 retv = 0;
257 break;
258 }
259 goto e_inval;
260
261 case IPV6_V6ONLY:
262 if (inet_sk(sk)->num)
263 goto e_inval;
264 np->ipv6only = valbool;
265 retv = 0;
266 break;
267
333fad53 268 case IPV6_RECVPKTINFO:
1da177e4
LT		 269 np->rxopt.bits.rxinfo = valbool;
270 retv = 0;
271 break;
333fad53
YH		 272
273 case IPV6_2292PKTINFO:
274 np->rxopt.bits.rxoinfo = valbool;
275 retv = 0;
276 break;
1da177e4 277
333fad53 278 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 279 np->rxopt.bits.rxhlim = valbool;
280 retv = 0;
281 break;
282
333fad53
YH		 283 case IPV6_2292HOPLIMIT:
284 np->rxopt.bits.rxohlim = valbool;
285 retv = 0;
286 break;
287
288 case IPV6_RECVRTHDR:
1da177e4
LT		 289 if (val < 0 || val > 2)
290 goto e_inval;
291 np->rxopt.bits.srcrt = val;
292 retv = 0;
293 break;
294
333fad53
YH		 295 case IPV6_2292RTHDR:
296 if (val < 0 || val > 2)
297 goto e_inval;
298 np->rxopt.bits.osrcrt = val;
299 retv = 0;
300 break;
301
302 case IPV6_RECVHOPOPTS:
1da177e4
LT		 303 np->rxopt.bits.hopopts = valbool;
304 retv = 0;
305 break;
306
333fad53
YH		 307 case IPV6_2292HOPOPTS:
308 np->rxopt.bits.ohopopts = valbool;
309 retv = 0;
310 break;
311
312 case IPV6_RECVDSTOPTS:
1da177e4
LT		 313 np->rxopt.bits.dstopts = valbool;
314 retv = 0;
315 break;
316
333fad53
YH		 317 case IPV6_2292DSTOPTS:
318 np->rxopt.bits.odstopts = valbool;
319 retv = 0;
320 break;
321
41a1f8ea
YH		 322 case IPV6_TCLASS:
323 if (val < 0 || val > 0xff)
324 goto e_inval;
325 np->tclass = val;
326 retv = 0;
327 break;
328
329 case IPV6_RECVTCLASS:
330 np->rxopt.bits.rxtclass = valbool;
331 retv = 0;
332 break;
333
1da177e4
LT		 334 case IPV6_FLOWINFO:
335 np->rxopt.bits.rxflow = valbool;
336 retv = 0;
337 break;
338
333fad53
YH		 339 case IPV6_HOPOPTS:
340 case IPV6_RTHDRDSTOPTS:
341 case IPV6_RTHDR:
342 case IPV6_DSTOPTS:
343 {
344 struct ipv6_txoptions *opt;
345 if (optlen == 0)
cb422c46 346 optval = NULL;
333fad53
YH		 347
348 /* hop-by-hop / destination options are privileged option */
349 retv = -EPERM;
350 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
351 break;
352
353 retv = -EINVAL;
354 if (optlen & 0x7 || optlen > 8 * 255)
355 break;
356
357 opt = ipv6_renew_options(sk, np->opt, optname,
358 (struct ipv6_opt_hdr __user *)optval,
359 optlen);
360 if (IS_ERR(opt)) {
361 retv = PTR_ERR(opt);
362 break;
363 }
364
365 /* routing header option needs extra check */
366 if (optname == IPV6_RTHDR && opt->srcrt) {
367 struct ipv6_rt_hdr *rthdr = opt->srcrt;
368 if (rthdr->type)
369 goto sticky_done;
370 if ((rthdr->hdrlen & 1) ||
371 (rthdr->hdrlen >> 1) != rthdr->segments_left)
372 goto sticky_done;
373 }
374
375 retv = 0;
d83d8461 376 if (inet_sk(sk)->is_icsk) {
333fad53 377 if (opt) {
d83d8461 378 struct inet_connection_sock *icsk = inet_csk(sk);
333fad53
YH		 379 if (!((1 << sk->sk_state) &
380 (TCPF_LISTEN | TCPF_CLOSE))
381 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
d83d8461
ACM		 382 icsk->icsk_ext_hdr_len =
383 opt->opt_flen + opt->opt_nflen;
384 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
333fad53
YH		 385 }
386 }
387 opt = xchg(&np->opt, opt);
388 sk_dst_reset(sk);
389 } else {
390 write_lock(&sk->sk_dst_lock);
391 opt = xchg(&np->opt, opt);
392 write_unlock(&sk->sk_dst_lock);
393 sk_dst_reset(sk);
394 }
395sticky_done:
396 if (opt)
397 sock_kfree_s(sk, opt, opt->tot_len);
398 break;
399 }
400
401 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 402 {
403 struct ipv6_txoptions *opt = NULL;
404 struct msghdr msg;
405 struct flowi fl;
406 int junk;
407
408 fl.fl6_flowlabel = 0;
409 fl.oif = sk->sk_bound_dev_if;
410
411 if (optlen == 0)
412 goto update;
413
414 /* 1K is probably excessive
415 * 1K is surely not enough, 2K per standard header is 16K.
416 */
417 retv = -EINVAL;
418 if (optlen > 64*1024)
419 break;
420
421 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
422 retv = -ENOBUFS;
423 if (opt == NULL)
424 break;
425
426 memset(opt, 0, sizeof(*opt));
427 opt->tot_len = sizeof(*opt) + optlen;
428 retv = -EFAULT;
429 if (copy_from_user(opt+1, optval, optlen))
430 goto done;
431
432 msg.msg_controllen = optlen;
433 msg.msg_control = (void*)(opt+1);
434
41a1f8ea 435 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
1da177e4
LT		 436 if (retv)
437 goto done;
438update:
439 retv = 0;
d83d8461 440 if (inet_sk(sk)->is_icsk) {
1da177e4 441 if (opt) {
d83d8461 442 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 443 if (!((1 << sk->sk_state) &
444 (TCPF_LISTEN | TCPF_CLOSE))
445 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
d83d8461
ACM		 446 icsk->icsk_ext_hdr_len =
447 opt->opt_flen + opt->opt_nflen;
448 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4
LT		 449 }
450 }
451 opt = xchg(&np->opt, opt);
452 sk_dst_reset(sk);
453 } else {
454 write_lock(&sk->sk_dst_lock);
455 opt = xchg(&np->opt, opt);
456 write_unlock(&sk->sk_dst_lock);
457 sk_dst_reset(sk);
458 }
459
460done:
461 if (opt)
462 sock_kfree_s(sk, opt, opt->tot_len);
463 break;
464 }
465 case IPV6_UNICAST_HOPS:
466 if (val > 255 || val < -1)
467 goto e_inval;
468 np->hop_limit = val;
469 retv = 0;
470 break;
471
472 case IPV6_MULTICAST_HOPS:
473 if (sk->sk_type == SOCK_STREAM)
474 goto e_inval;
475 if (val > 255 || val < -1)
476 goto e_inval;
477 np->mcast_hops = val;
478 retv = 0;
479 break;
480
481 case IPV6_MULTICAST_LOOP:
482 np->mc_loop = valbool;
483 retv = 0;
484 break;
485
486 case IPV6_MULTICAST_IF:
487 if (sk->sk_type == SOCK_STREAM)
488 goto e_inval;
489 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
490 goto e_inval;
491
492 if (__dev_get_by_index(val) == NULL) {
493 retv = -ENODEV;
494 break;
495 }
496 np->mcast_oif = val;
497 retv = 0;
498 break;
499 case IPV6_ADD_MEMBERSHIP:
500 case IPV6_DROP_MEMBERSHIP:
501 {
502 struct ipv6_mreq mreq;
503
504 retv = -EFAULT;
505 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
506 break;
507
508 if (optname == IPV6_ADD_MEMBERSHIP)
509 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
510 else
511 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
512 break;
513 }
514 case IPV6_JOIN_ANYCAST:
515 case IPV6_LEAVE_ANYCAST:
516 {
517 struct ipv6_mreq mreq;
518
519 if (optlen != sizeof(struct ipv6_mreq))
520 goto e_inval;
521
522 retv = -EFAULT;
523 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
524 break;
525
526 if (optname == IPV6_JOIN_ANYCAST)
527 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
528 else
529 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
530 break;
531 }
532 case MCAST_JOIN_GROUP:
533 case MCAST_LEAVE_GROUP:
534 {
535 struct group_req greq;
536 struct sockaddr_in6 *psin6;
537
538 retv = -EFAULT;
539 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
540 break;
541 if (greq.gr_group.ss_family != AF_INET6) {
542 retv = -EADDRNOTAVAIL;
543 break;
544 }
545 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
546 if (optname == MCAST_JOIN_GROUP)
547 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
548 &psin6->sin6_addr);
549 else
550 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
551 &psin6->sin6_addr);
552 break;
553 }
554 case MCAST_JOIN_SOURCE_GROUP:
555 case MCAST_LEAVE_SOURCE_GROUP:
556 case MCAST_BLOCK_SOURCE:
557 case MCAST_UNBLOCK_SOURCE:
558 {
559 struct group_source_req greqs;
560 int omode, add;
561
562 if (optlen != sizeof(struct group_source_req))
563 goto e_inval;
564 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
565 retv = -EFAULT;
566 break;
567 }
568 if (greqs.gsr_group.ss_family != AF_INET6 ||
569 greqs.gsr_source.ss_family != AF_INET6) {
570 retv = -EADDRNOTAVAIL;
571 break;
572 }
573 if (optname == MCAST_BLOCK_SOURCE) {
574 omode = MCAST_EXCLUDE;
575 add = 1;
576 } else if (optname == MCAST_UNBLOCK_SOURCE) {
577 omode = MCAST_EXCLUDE;
578 add = 0;
579 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
580 struct sockaddr_in6 *psin6;
581
582 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
583 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
584 &psin6->sin6_addr);
c9e3e8b6
DS		 585 /* prior join w/ different source is ok */
586 if (retv && retv != -EADDRINUSE)
1da177e4
LT		 587 break;
588 omode = MCAST_INCLUDE;
589 add = 1;
c9e3e8b6 590 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1da177e4
LT		 591 omode = MCAST_INCLUDE;
592 add = 0;
593 }
594 retv = ip6_mc_source(add, omode, sk, &greqs);
595 break;
596 }
597 case MCAST_MSFILTER:
598 {
1da177e4
LT		 599 extern int sysctl_mld_max_msf;
600 struct group_filter *gsf;
601
602 if (optlen < GROUP_FILTER_SIZE(0))
603 goto e_inval;
604 if (optlen > sysctl_optmem_max) {
605 retv = -ENOBUFS;
606 break;
607 }
8b3a7005 608 gsf = kmalloc(optlen,GFP_KERNEL);
1da177e4
LT		 609 if (gsf == 0) {
610 retv = -ENOBUFS;
611 break;
612 }
613 retv = -EFAULT;
614 if (copy_from_user(gsf, optval, optlen)) {
615 kfree(gsf);
616 break;
617 }
618 /* numsrc >= (4G-140)/128 overflow in 32 bits */
619 if (gsf->gf_numsrc >= 0x1ffffffU ||
620 gsf->gf_numsrc > sysctl_mld_max_msf) {
621 kfree(gsf);
622 retv = -ENOBUFS;
623 break;
624 }
625 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
626 kfree(gsf);
627 retv = -EINVAL;
628 break;
629 }
630 retv = ip6_mc_msfilter(sk, gsf);
631 kfree(gsf);
632
633 break;
634 }
635 case IPV6_ROUTER_ALERT:
636 retv = ip6_ra_control(sk, val, NULL);
637 break;
638 case IPV6_MTU_DISCOVER:
639 if (val<0 || val>2)
640 goto e_inval;
641 np->pmtudisc = val;
642 retv = 0;
643 break;
644 case IPV6_MTU:
645 if (val && val < IPV6_MIN_MTU)
646 goto e_inval;
647 np->frag_size = val;
648 retv = 0;
649 break;
650 case IPV6_RECVERR:
651 np->recverr = valbool;
652 if (!val)
653 skb_queue_purge(&sk->sk_error_queue);
654 retv = 0;
655 break;
656 case IPV6_FLOWINFO_SEND:
657 np->sndflow = valbool;
658 retv = 0;
659 break;
660 case IPV6_FLOWLABEL_MGR:
661 retv = ipv6_flowlabel_opt(sk, optval, optlen);
662 break;
663 case IPV6_IPSEC_POLICY:
664 case IPV6_XFRM_POLICY:
6fc0b4a7
HX		 665 retv = -EPERM;
666 if (!capable(CAP_NET_ADMIN))
667 break;
1da177e4
LT		 668 retv = xfrm_user_policy(sk, optname, optval, optlen);
669 break;
670
1da177e4
LT		 671 }
672 release_sock(sk);
673
1da177e4
LT		 674 return retv;
675
676e_inval:
677 release_sock(sk);
678 return -EINVAL;
679}
680
3fdadf7d
DM		 681int ipv6_setsockopt(struct sock *sk, int level, int optname,
682 char __user *optval, int optlen)
683{
684 int err;
685
686 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
687 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
688
689 if (level != SOL_IPV6)
690 return -ENOPROTOOPT;
691
692 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
693#ifdef CONFIG_NETFILTER
694 /* we need to exclude all possible ENOPROTOOPTs except default case */
695 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
696 optname != IPV6_XFRM_POLICY) {
697 lock_sock(sk);
698 err = nf_setsockopt(sk, PF_INET6, optname, optval,
699 optlen);
700 release_sock(sk);
701 }
702#endif
703 return err;
704}
705
706
707#ifdef CONFIG_COMPAT
708int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
543d9cfe 709 char __user *optval, int optlen)
3fdadf7d
DM		 710{
711 int err;
712
713 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 714 if (udp_prot.compat_setsockopt != NULL)
715 return udp_prot.compat_setsockopt(sk, level, optname,
716 optval, optlen);
717 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 718 }
719
720 if (level != SOL_IPV6)
721 return -ENOPROTOOPT;
722
723 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
724#ifdef CONFIG_NETFILTER
725 /* we need to exclude all possible ENOPROTOOPTs except default case */
726 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
543d9cfe 727 optname != IPV6_XFRM_POLICY) {
3fdadf7d 728 lock_sock(sk);
543d9cfe
ACM		 729 err = compat_nf_setsockopt(sk, PF_INET6, optname,
730 optval, optlen);
3fdadf7d
DM		 731 release_sock(sk);
732 }
733#endif
734 return err;
735}
543d9cfe
ACM		 736
737EXPORT_SYMBOL(compat_ipv6_setsockopt);
3fdadf7d
DM		 738#endif
739
34a0b3cd
AB		 740static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
741 char __user *optval, int len)
333fad53
YH		 742{
743 if (!hdr)
744 return 0;
745 len = min_t(int, len, ipv6_optlen(hdr));
746 if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
747 return -EFAULT;
748 return len;
749}
750
3fdadf7d 751static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 752 char __user *optval, int __user *optlen)
753{
754 struct ipv6_pinfo *np = inet6_sk(sk);
755 int len;
756 int val;
757
1da177e4
LT		 758 if (get_user(len, optlen))
759 return -EFAULT;
760 switch (optname) {
761 case IPV6_ADDRFORM:
762 if (sk->sk_protocol != IPPROTO_UDP &&
763 sk->sk_protocol != IPPROTO_TCP)
764 return -EINVAL;
765 if (sk->sk_state != TCP_ESTABLISHED)
766 return -ENOTCONN;
767 val = sk->sk_family;
768 break;
769 case MCAST_MSFILTER:
770 {
771 struct group_filter gsf;
772 int err;
773
774 if (len < GROUP_FILTER_SIZE(0))
775 return -EINVAL;
776 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
777 return -EFAULT;
778 lock_sock(sk);
779 err = ip6_mc_msfget(sk, &gsf,
780 (struct group_filter __user *)optval, optlen);
781 release_sock(sk);
782 return err;
783 }
784
333fad53 785 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 786 {
787 struct msghdr msg;
788 struct sk_buff *skb;
789
790 if (sk->sk_type != SOCK_STREAM)
791 return -ENOPROTOOPT;
792
793 msg.msg_control = optval;
794 msg.msg_controllen = len;
795 msg.msg_flags = 0;
796
797 lock_sock(sk);
798 skb = np->pktoptions;
799 if (skb)
800 atomic_inc(&skb->users);
801 release_sock(sk);
802
803 if (skb) {
804 int err = datagram_recv_ctl(sk, &msg, skb);
805 kfree_skb(skb);
806 if (err)
807 return err;
808 } else {
809 if (np->rxopt.bits.rxinfo) {
810 struct in6_pktinfo src_info;
811 src_info.ipi6_ifindex = np->mcast_oif;
812 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
813 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
814 }
815 if (np->rxopt.bits.rxhlim) {
816 int hlim = np->mcast_hops;
817 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
818 }
333fad53
YH		 819 if (np->rxopt.bits.rxoinfo) {
820 struct in6_pktinfo src_info;
821 src_info.ipi6_ifindex = np->mcast_oif;
822 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
823 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
824 }
825 if (np->rxopt.bits.rxohlim) {
826 int hlim = np->mcast_hops;
827 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
828 }
1da177e4
LT		 829 }
830 len -= msg.msg_controllen;
831 return put_user(len, optlen);
832 }
833 case IPV6_MTU:
834 {
835 struct dst_entry *dst;
836 val = 0;
837 lock_sock(sk);
838 dst = sk_dst_get(sk);
839 if (dst) {
840 val = dst_mtu(dst);
841 dst_release(dst);
842 }
843 release_sock(sk);
844 if (!val)
845 return -ENOTCONN;
846 break;
847 }
848
849 case IPV6_V6ONLY:
850 val = np->ipv6only;
851 break;
852
333fad53 853 case IPV6_RECVPKTINFO:
1da177e4
LT		 854 val = np->rxopt.bits.rxinfo;
855 break;
856
333fad53
YH		 857 case IPV6_2292PKTINFO:
858 val = np->rxopt.bits.rxoinfo;
859 break;
860
861 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 862 val = np->rxopt.bits.rxhlim;
863 break;
864
333fad53
YH		 865 case IPV6_2292HOPLIMIT:
866 val = np->rxopt.bits.rxohlim;
867 break;
868
869 case IPV6_RECVRTHDR:
1da177e4
LT		 870 val = np->rxopt.bits.srcrt;
871 break;
872
333fad53
YH		 873 case IPV6_2292RTHDR:
874 val = np->rxopt.bits.osrcrt;
875 break;
876
1da177e4 877 case IPV6_HOPOPTS:
333fad53
YH		 878 case IPV6_RTHDRDSTOPTS:
879 case IPV6_RTHDR:
880 case IPV6_DSTOPTS:
881 {
882
883 lock_sock(sk);
884 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
885 optval, len);
886 release_sock(sk);
887 return put_user(len, optlen);
888 }
889
890 case IPV6_RECVHOPOPTS:
1da177e4
LT		 891 val = np->rxopt.bits.hopopts;
892 break;
893
333fad53
YH		 894 case IPV6_2292HOPOPTS:
895 val = np->rxopt.bits.ohopopts;
896 break;
897
898 case IPV6_RECVDSTOPTS:
1da177e4
LT		 899 val = np->rxopt.bits.dstopts;
900 break;
901
333fad53
YH		 902 case IPV6_2292DSTOPTS:
903 val = np->rxopt.bits.odstopts;
904 break;
905
41a1f8ea
YH		 906 case IPV6_TCLASS:
907 val = np->tclass;
908 break;
909
910 case IPV6_RECVTCLASS:
911 val = np->rxopt.bits.rxtclass;
912 break;
913
1da177e4
LT		 914 case IPV6_FLOWINFO:
915 val = np->rxopt.bits.rxflow;
916 break;
917
918 case IPV6_UNICAST_HOPS:
919 val = np->hop_limit;
920 break;
921
922 case IPV6_MULTICAST_HOPS:
923 val = np->mcast_hops;
924 break;
925
926 case IPV6_MULTICAST_LOOP:
927 val = np->mc_loop;
928 break;
929
930 case IPV6_MULTICAST_IF:
931 val = np->mcast_oif;
932 break;
933
934 case IPV6_MTU_DISCOVER:
935 val = np->pmtudisc;
936 break;
937
938 case IPV6_RECVERR:
939 val = np->recverr;
940 break;
941
942 case IPV6_FLOWINFO_SEND:
943 val = np->sndflow;
944 break;
945
946 default:
1da177e4 947 return -EINVAL;
1da177e4
LT		 948 }
949 len = min_t(unsigned int, sizeof(int), len);
950 if(put_user(len, optlen))
951 return -EFAULT;
952 if(copy_to_user(optval,&val,len))
953 return -EFAULT;
954 return 0;
955}
956
3fdadf7d
DM		 957int ipv6_getsockopt(struct sock *sk, int level, int optname,
958 char __user *optval, int __user *optlen)
959{
960 int err;
961
962 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
963 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
964
965 if(level != SOL_IPV6)
966 return -ENOPROTOOPT;
967
968 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
969#ifdef CONFIG_NETFILTER
970 /* we need to exclude all possible EINVALs except default case */
443da0d5 971 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
3fdadf7d
DM		 972 optname != MCAST_MSFILTER) {
973 int len;
974
975 if (get_user(len, optlen))
976 return -EFAULT;
977
978 lock_sock(sk);
979 err = nf_getsockopt(sk, PF_INET6, optname, optval,
980 &len);
981 release_sock(sk);
982 if (err >= 0)
983 err = put_user(len, optlen);
984 }
985#endif
986 return err;
987}
988
989#ifdef CONFIG_COMPAT
990int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
543d9cfe 991 char __user *optval, int __user *optlen)
3fdadf7d
DM		 992{
993 int err;
994
995 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 996 if (udp_prot.compat_getsockopt != NULL)
997 return udp_prot.compat_getsockopt(sk, level, optname,
998 optval, optlen);
999 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1000 }
1001
543d9cfe 1002 if (level != SOL_IPV6)
3fdadf7d
DM		 1003 return -ENOPROTOOPT;
1004
1005 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1006#ifdef CONFIG_NETFILTER
1007 /* we need to exclude all possible EINVALs except default case */
443da0d5 1008 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
3fdadf7d
DM		 1009 optname != MCAST_MSFILTER) {
1010 int len;
1011
1012 if (get_user(len, optlen))
1013 return -EFAULT;
1014
1015 lock_sock(sk);
543d9cfe
ACM		 1016 err = compat_nf_getsockopt(sk, PF_INET6,
1017 optname, optval, &len);
3fdadf7d
DM		 1018 release_sock(sk);
1019 if (err >= 0)
1020 err = put_user(len, optlen);
1021 }
1022#endif
1023 return err;
1024}
543d9cfe
ACM		 1025
1026EXPORT_SYMBOL(compat_ipv6_getsockopt);
3fdadf7d
DM		 1027#endif
1028
1da177e4
LT		 1029void __init ipv6_packet_init(void)
1030{
1031 dev_add_pack(&ipv6_packet_type);
1032}
1033
1034void ipv6_packet_cleanup(void)
1035{
1036 dev_remove_pack(&ipv6_packet_type);
1037}
Linux kernel - Deliverables
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