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[NET]: sparse warning fixes
[net-next-2.6.git] / net / ipv6 / ipv6_sockglue.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 BSD socket options interface
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 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>
1da177e4
LT		 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>
ba4e58ec 53#include <net/udplite.h>
1da177e4
LT		 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
a430a43d
HX		 60static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
61 int proto)
adcfc7d0 62{
a430a43d 63 struct inet6_protocol *ops = NULL;
bbcf467d 64
adcfc7d0
HX		 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))
a430a43d 73 break;
adcfc7d0
HX		 74
75 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
76 break;
77 }
78
79 if (unlikely(!pskb_may_pull(skb, 8)))
a430a43d 80 break;
adcfc7d0
HX		 81
82 opth = (void *)skb->data;
83 len = opth->hdrlen * 8 + 8;
84
85 if (unlikely(!pskb_may_pull(skb, len)))
a430a43d 86 break;
adcfc7d0
HX		 87
88 proto = opth->nexthdr;
89 __skb_pull(skb, len);
90 }
91
a430a43d
HX		 92 return ops;
93}
94
95static 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
0660e03f 104 ipv6h = ipv6_hdr(skb);
a430a43d
HX		 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)) {
badff6d0 111 skb_reset_transport_header(skb);
a430a43d
HX		 112 err = ops->gso_send_check(skb);
113 }
114 rcu_read_unlock();
115
116out:
117 return err;
118}
adcfc7d0 119
a430a43d
HX		 120static 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
d212f87b 126 if (!(features & NETIF_F_V6_CSUM))
1a9e9ef6
HX		 127 features &= ~NETIF_F_SG;
128
a430a43d
HX		 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
0660e03f 140 ipv6h = ipv6_hdr(skb);
a430a43d
HX		 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)) {
badff6d0 147 skb_reset_transport_header(skb);
a430a43d
HX		 148 segs = ops->gso_segment(skb, features);
149 }
adcfc7d0
HX		 150 rcu_read_unlock();
151
152 if (unlikely(IS_ERR(segs)))
153 goto out;
154
155 for (skb = segs; skb; skb = skb->next) {
0660e03f 156 ipv6h = ipv6_hdr(skb);
6703931c
MC		 157 ipv6h->payload_len = htons(skb->len - skb->mac_len -
158 sizeof(*ipv6h));
adcfc7d0
HX		 159 }
160
161out:
162 return segs;
163}
164
1da177e4 165static struct packet_type ipv6_packet_type = {
1ab1457c 166 .type = __constant_htons(ETH_P_IPV6),
1da177e4 167 .func = ipv6_rcv,
a430a43d 168 .gso_send_check = ipv6_gso_send_check,
adcfc7d0 169 .gso_segment = ipv6_gso_segment,
1da177e4
LT		 170};
171
172struct ip6_ra_chain *ip6_ra_chain;
173DEFINE_RWLOCK(ip6_ra_lock);
174
175int 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);
a51482bd 190 kfree(new_ra);
1da177e4
LT		 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
3fdadf7d 218static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 219 char __user *optval, int optlen)
220{
221 struct ipv6_pinfo *np = inet6_sk(sk);
222 int val, valbool;
223 int retv = -ENOPROTOOPT;
224
1da177e4
LT		 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 &&
ba4e58ec 242 sk->sk_protocol != IPPROTO_UDPLITE &&
1da177e4
LT		 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) ||
e773e4fa 252 !ipv6_addr_v4mapped(&np->daddr)) {
1da177e4
LT		 253 retv = -EADDRNOTAVAIL;
254 break;
255 }
256
257 fl6_free_socklist(sk);
258 ipv6_sock_mc_close(sk);
259
e6848976
ACM		 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
1da177e4 267 if (sk->sk_protocol == IPPROTO_TCP) {
d83d8461 268 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 269
270 local_bh_disable();
271 sock_prot_dec_use(sk->sk_prot);
272 sock_prot_inc_use(&tcp_prot);
273 local_bh_enable();
274 sk->sk_prot = &tcp_prot;
d83d8461 275 icsk->icsk_af_ops = &ipv4_specific;
1da177e4
LT		 276 sk->sk_socket->ops = &inet_stream_ops;
277 sk->sk_family = PF_INET;
d83d8461 278 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 279 } else {
ba4e58ec
GR		 280 struct proto *prot = &udp_prot;
281
282 if (sk->sk_protocol == IPPROTO_UDPLITE)
283 prot = &udplite_prot;
1da177e4
LT		 284 local_bh_disable();
285 sock_prot_dec_use(sk->sk_prot);
ba4e58ec 286 sock_prot_inc_use(prot);
1da177e4 287 local_bh_enable();
ba4e58ec 288 sk->sk_prot = prot;
1da177e4
LT		 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;
e6848976
ACM		 300 /*
301 * ... and add it to the refcnt debug socks count
302 * in the new family. -acme
303 */
304 sk_refcnt_debug_inc(sk);
1da177e4
LT		 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
333fad53 318 case IPV6_RECVPKTINFO:
1da177e4
LT		 319 np->rxopt.bits.rxinfo = valbool;
320 retv = 0;
321 break;
1ab1457c 322
333fad53
YH		 323 case IPV6_2292PKTINFO:
324 np->rxopt.bits.rxoinfo = valbool;
325 retv = 0;
326 break;
1da177e4 327
333fad53 328 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 329 np->rxopt.bits.rxhlim = valbool;
330 retv = 0;
331 break;
332
333fad53
YH		 333 case IPV6_2292HOPLIMIT:
334 np->rxopt.bits.rxohlim = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_RECVRTHDR:
4c752098 339 np->rxopt.bits.srcrt = valbool;
1da177e4
LT		 340 retv = 0;
341 break;
342
333fad53 343 case IPV6_2292RTHDR:
4c752098 344 np->rxopt.bits.osrcrt = valbool;
333fad53
YH		 345 retv = 0;
346 break;
347
348 case IPV6_RECVHOPOPTS:
1da177e4
LT		 349 np->rxopt.bits.hopopts = valbool;
350 retv = 0;
351 break;
352
333fad53
YH		 353 case IPV6_2292HOPOPTS:
354 np->rxopt.bits.ohopopts = valbool;
355 retv = 0;
356 break;
357
358 case IPV6_RECVDSTOPTS:
1da177e4
LT		 359 np->rxopt.bits.dstopts = valbool;
360 retv = 0;
361 break;
362
333fad53
YH		 363 case IPV6_2292DSTOPTS:
364 np->rxopt.bits.odstopts = valbool;
365 retv = 0;
366 break;
367
41a1f8ea 368 case IPV6_TCLASS:
d0ee011f 369 if (val < -1 || val > 0xff)
41a1f8ea
YH		 370 goto e_inval;
371 np->tclass = val;
372 retv = 0;
373 break;
1ab1457c 374
41a1f8ea
YH		 375 case IPV6_RECVTCLASS:
376 np->rxopt.bits.rxtclass = valbool;
377 retv = 0;
378 break;
379
1da177e4
LT		 380 case IPV6_FLOWINFO:
381 np->rxopt.bits.rxflow = valbool;
382 retv = 0;
383 break;
384
333fad53
YH		 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)
cb422c46 392 optval = NULL;
333fad53
YH		 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 */
dfee0a72 412 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
333fad53 413 struct ipv6_rt_hdr *rthdr = opt->srcrt;
280a9d34 414 switch (rthdr->type) {
59fbb3a6 415#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
280a9d34 416 case IPV6_SRCRT_TYPE_2:
280a9d34 417 break;
bb4dbf9e 418#endif
280a9d34 419 default:
333fad53 420 goto sticky_done;
280a9d34
MN		 421 }
422
333fad53
YH		 423 if ((rthdr->hdrlen & 1) ||
424 (rthdr->hdrlen >> 1) != rthdr->segments_left)
425 goto sticky_done;
426 }
427
428 retv = 0;
d83d8461 429 if (inet_sk(sk)->is_icsk) {
333fad53 430 if (opt) {
d83d8461 431 struct inet_connection_sock *icsk = inet_csk(sk);
333fad53
YH		 432 if (!((1 << sk->sk_state) &
433 (TCPF_LISTEN | TCPF_CLOSE))
434 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
d83d8461
ACM		 435 icsk->icsk_ext_hdr_len =
436 opt->opt_flen + opt->opt_nflen;
437 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
333fad53
YH		 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 }
448sticky_done:
449 if (opt)
450 sock_kfree_s(sk, opt, opt->tot_len);
451 break;
452 }
453
454 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 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
41a1f8ea 488 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
1da177e4
LT		 489 if (retv)
490 goto done;
491update:
492 retv = 0;
d83d8461 493 if (inet_sk(sk)->is_icsk) {
1da177e4 494 if (opt) {
d83d8461 495 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 496 if (!((1 << sk->sk_state) &
497 (TCPF_LISTEN | TCPF_CLOSE))
498 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
d83d8461
ACM		 499 icsk->icsk_ext_hdr_len =
500 opt->opt_flen + opt->opt_nflen;
501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4
LT		 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
513done:
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 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
543 goto e_inval;
544
881d966b 545 if (__dev_get_by_index(&init_net, val) == NULL) {
1da177e4
LT		 546 retv = -ENODEV;
547 break;
548 }
549 np->mcast_oif = val;
550 retv = 0;
551 break;
552 case IPV6_ADD_MEMBERSHIP:
553 case IPV6_DROP_MEMBERSHIP:
554 {
555 struct ipv6_mreq mreq;
556
a96fb49b
FL		 557 retv = -EPROTO;
558 if (inet_sk(sk)->is_icsk)
559 break;
560
1da177e4
LT		 561 retv = -EFAULT;
562 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
563 break;
564
565 if (optname == IPV6_ADD_MEMBERSHIP)
566 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
567 else
568 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
569 break;
570 }
571 case IPV6_JOIN_ANYCAST:
572 case IPV6_LEAVE_ANYCAST:
573 {
574 struct ipv6_mreq mreq;
575
576 if (optlen != sizeof(struct ipv6_mreq))
577 goto e_inval;
578
579 retv = -EFAULT;
580 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
581 break;
582
583 if (optname == IPV6_JOIN_ANYCAST)
584 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
585 else
586 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
587 break;
588 }
589 case MCAST_JOIN_GROUP:
590 case MCAST_LEAVE_GROUP:
591 {
592 struct group_req greq;
593 struct sockaddr_in6 *psin6;
594
595 retv = -EFAULT;
596 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
597 break;
598 if (greq.gr_group.ss_family != AF_INET6) {
599 retv = -EADDRNOTAVAIL;
600 break;
601 }
602 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
603 if (optname == MCAST_JOIN_GROUP)
604 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
605 &psin6->sin6_addr);
606 else
607 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
608 &psin6->sin6_addr);
609 break;
610 }
611 case MCAST_JOIN_SOURCE_GROUP:
612 case MCAST_LEAVE_SOURCE_GROUP:
613 case MCAST_BLOCK_SOURCE:
614 case MCAST_UNBLOCK_SOURCE:
615 {
616 struct group_source_req greqs;
617 int omode, add;
618
619 if (optlen != sizeof(struct group_source_req))
620 goto e_inval;
621 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
622 retv = -EFAULT;
623 break;
624 }
625 if (greqs.gsr_group.ss_family != AF_INET6 ||
626 greqs.gsr_source.ss_family != AF_INET6) {
627 retv = -EADDRNOTAVAIL;
628 break;
629 }
630 if (optname == MCAST_BLOCK_SOURCE) {
631 omode = MCAST_EXCLUDE;
632 add = 1;
633 } else if (optname == MCAST_UNBLOCK_SOURCE) {
634 omode = MCAST_EXCLUDE;
635 add = 0;
636 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
637 struct sockaddr_in6 *psin6;
638
639 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
640 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
641 &psin6->sin6_addr);
c9e3e8b6
DS		 642 /* prior join w/ different source is ok */
643 if (retv && retv != -EADDRINUSE)
1da177e4
LT		 644 break;
645 omode = MCAST_INCLUDE;
646 add = 1;
c9e3e8b6 647 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1da177e4
LT		 648 omode = MCAST_INCLUDE;
649 add = 0;
650 }
651 retv = ip6_mc_source(add, omode, sk, &greqs);
652 break;
653 }
654 case MCAST_MSFILTER:
655 {
1da177e4
LT		 656 extern int sysctl_mld_max_msf;
657 struct group_filter *gsf;
658
659 if (optlen < GROUP_FILTER_SIZE(0))
660 goto e_inval;
661 if (optlen > sysctl_optmem_max) {
662 retv = -ENOBUFS;
663 break;
664 }
8b3a7005 665 gsf = kmalloc(optlen,GFP_KERNEL);
cfcabdcc 666 if (!gsf) {
1da177e4
LT		 667 retv = -ENOBUFS;
668 break;
669 }
670 retv = -EFAULT;
671 if (copy_from_user(gsf, optval, optlen)) {
672 kfree(gsf);
673 break;
674 }
675 /* numsrc >= (4G-140)/128 overflow in 32 bits */
676 if (gsf->gf_numsrc >= 0x1ffffffU ||
677 gsf->gf_numsrc > sysctl_mld_max_msf) {
678 kfree(gsf);
679 retv = -ENOBUFS;
680 break;
681 }
682 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
683 kfree(gsf);
684 retv = -EINVAL;
685 break;
686 }
687 retv = ip6_mc_msfilter(sk, gsf);
688 kfree(gsf);
689
690 break;
691 }
692 case IPV6_ROUTER_ALERT:
693 retv = ip6_ra_control(sk, val, NULL);
694 break;
695 case IPV6_MTU_DISCOVER:
628a5c56 696 if (val<0 || val>3)
1da177e4
LT		 697 goto e_inval;
698 np->pmtudisc = val;
699 retv = 0;
700 break;
701 case IPV6_MTU:
702 if (val && val < IPV6_MIN_MTU)
703 goto e_inval;
704 np->frag_size = val;
705 retv = 0;
706 break;
707 case IPV6_RECVERR:
708 np->recverr = valbool;
709 if (!val)
710 skb_queue_purge(&sk->sk_error_queue);
711 retv = 0;
712 break;
713 case IPV6_FLOWINFO_SEND:
714 np->sndflow = valbool;
715 retv = 0;
716 break;
717 case IPV6_FLOWLABEL_MGR:
718 retv = ipv6_flowlabel_opt(sk, optval, optlen);
719 break;
720 case IPV6_IPSEC_POLICY:
721 case IPV6_XFRM_POLICY:
6fc0b4a7
HX		 722 retv = -EPERM;
723 if (!capable(CAP_NET_ADMIN))
724 break;
1da177e4
LT		 725 retv = xfrm_user_policy(sk, optname, optval, optlen);
726 break;
727
1da177e4
LT		 728 }
729 release_sock(sk);
730
1da177e4
LT		 731 return retv;
732
733e_inval:
734 release_sock(sk);
735 return -EINVAL;
736}
737
3fdadf7d
DM		 738int ipv6_setsockopt(struct sock *sk, int level, int optname,
739 char __user *optval, int optlen)
740{
741 int err;
742
743 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
744 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
745
746 if (level != SOL_IPV6)
747 return -ENOPROTOOPT;
748
749 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
750#ifdef CONFIG_NETFILTER
751 /* we need to exclude all possible ENOPROTOOPTs except default case */
752 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
753 optname != IPV6_XFRM_POLICY) {
754 lock_sock(sk);
755 err = nf_setsockopt(sk, PF_INET6, optname, optval,
756 optlen);
757 release_sock(sk);
758 }
759#endif
760 return err;
761}
762
7159039a 763EXPORT_SYMBOL(ipv6_setsockopt);
3fdadf7d
DM		 764
765#ifdef CONFIG_COMPAT
766int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
543d9cfe 767 char __user *optval, int optlen)
3fdadf7d
DM		 768{
769 int err;
770
771 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 772 if (udp_prot.compat_setsockopt != NULL)
773 return udp_prot.compat_setsockopt(sk, level, optname,
774 optval, optlen);
775 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 776 }
777
778 if (level != SOL_IPV6)
779 return -ENOPROTOOPT;
780
781 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
782#ifdef CONFIG_NETFILTER
783 /* we need to exclude all possible ENOPROTOOPTs except default case */
784 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
543d9cfe 785 optname != IPV6_XFRM_POLICY) {
3fdadf7d 786 lock_sock(sk);
543d9cfe
ACM		 787 err = compat_nf_setsockopt(sk, PF_INET6, optname,
788 optval, optlen);
3fdadf7d
DM		 789 release_sock(sk);
790 }
791#endif
792 return err;
793}
543d9cfe
ACM		 794
795EXPORT_SYMBOL(compat_ipv6_setsockopt);
3fdadf7d
DM		 796#endif
797
28693079 798static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
4c6510a7 799 int optname, char __user *optval, int len)
333fad53 800{
28693079
DM		 801 struct ipv6_opt_hdr *hdr;
802
4c6510a7
YH		 803 if (!opt)
804 return 0;
805
806 switch(optname) {
807 case IPV6_HOPOPTS:
808 hdr = opt->hopopt;
809 break;
810 case IPV6_RTHDRDSTOPTS:
811 hdr = opt->dst0opt;
812 break;
813 case IPV6_RTHDR:
814 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
815 break;
816 case IPV6_DSTOPTS:
817 hdr = opt->dst1opt;
818 break;
819 default:
820 return -EINVAL; /* should not happen */
821 }
822
823 if (!hdr)
333fad53 824 return 0;
28693079 825
d2b02ed9 826 len = min_t(unsigned int, len, ipv6_optlen(hdr));
660adc6e 827 if (copy_to_user(optval, hdr, len))
333fad53 828 return -EFAULT;
e5268f12 829 return ipv6_optlen(hdr);
333fad53
YH		 830}
831
3fdadf7d 832static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 833 char __user *optval, int __user *optlen)
834{
835 struct ipv6_pinfo *np = inet6_sk(sk);
836 int len;
837 int val;
838
1da177e4
LT		 839 if (get_user(len, optlen))
840 return -EFAULT;
841 switch (optname) {
842 case IPV6_ADDRFORM:
843 if (sk->sk_protocol != IPPROTO_UDP &&
ba4e58ec 844 sk->sk_protocol != IPPROTO_UDPLITE &&
1da177e4
LT		 845 sk->sk_protocol != IPPROTO_TCP)
846 return -EINVAL;
847 if (sk->sk_state != TCP_ESTABLISHED)
848 return -ENOTCONN;
849 val = sk->sk_family;
850 break;
851 case MCAST_MSFILTER:
852 {
853 struct group_filter gsf;
854 int err;
855
856 if (len < GROUP_FILTER_SIZE(0))
857 return -EINVAL;
858 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
859 return -EFAULT;
860 lock_sock(sk);
861 err = ip6_mc_msfget(sk, &gsf,
862 (struct group_filter __user *)optval, optlen);
863 release_sock(sk);
864 return err;
865 }
866
333fad53 867 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 868 {
869 struct msghdr msg;
870 struct sk_buff *skb;
871
872 if (sk->sk_type != SOCK_STREAM)
873 return -ENOPROTOOPT;
874
875 msg.msg_control = optval;
876 msg.msg_controllen = len;
877 msg.msg_flags = 0;
878
879 lock_sock(sk);
880 skb = np->pktoptions;
881 if (skb)
882 atomic_inc(&skb->users);
883 release_sock(sk);
884
885 if (skb) {
886 int err = datagram_recv_ctl(sk, &msg, skb);
887 kfree_skb(skb);
888 if (err)
889 return err;
890 } else {
891 if (np->rxopt.bits.rxinfo) {
892 struct in6_pktinfo src_info;
893 src_info.ipi6_ifindex = np->mcast_oif;
894 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
895 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
896 }
897 if (np->rxopt.bits.rxhlim) {
898 int hlim = np->mcast_hops;
899 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
900 }
333fad53
YH		 901 if (np->rxopt.bits.rxoinfo) {
902 struct in6_pktinfo src_info;
903 src_info.ipi6_ifindex = np->mcast_oif;
904 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
905 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
906 }
907 if (np->rxopt.bits.rxohlim) {
908 int hlim = np->mcast_hops;
909 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
910 }
1da177e4
LT		 911 }
912 len -= msg.msg_controllen;
913 return put_user(len, optlen);
914 }
915 case IPV6_MTU:
916 {
917 struct dst_entry *dst;
1ab1457c 918 val = 0;
1da177e4
LT		 919 lock_sock(sk);
920 dst = sk_dst_get(sk);
921 if (dst) {
922 val = dst_mtu(dst);
923 dst_release(dst);
924 }
925 release_sock(sk);
926 if (!val)
927 return -ENOTCONN;
928 break;
929 }
930
931 case IPV6_V6ONLY:
932 val = np->ipv6only;
933 break;
934
333fad53 935 case IPV6_RECVPKTINFO:
1da177e4
LT		 936 val = np->rxopt.bits.rxinfo;
937 break;
938
333fad53
YH		 939 case IPV6_2292PKTINFO:
940 val = np->rxopt.bits.rxoinfo;
941 break;
942
943 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 944 val = np->rxopt.bits.rxhlim;
945 break;
946
333fad53
YH		 947 case IPV6_2292HOPLIMIT:
948 val = np->rxopt.bits.rxohlim;
949 break;
950
951 case IPV6_RECVRTHDR:
1da177e4
LT		 952 val = np->rxopt.bits.srcrt;
953 break;
954
333fad53
YH		 955 case IPV6_2292RTHDR:
956 val = np->rxopt.bits.osrcrt;
957 break;
958
1da177e4 959 case IPV6_HOPOPTS:
333fad53
YH		 960 case IPV6_RTHDRDSTOPTS:
961 case IPV6_RTHDR:
962 case IPV6_DSTOPTS:
963 {
964
965 lock_sock(sk);
28693079 966 len = ipv6_getsockopt_sticky(sk, np->opt,
4c6510a7 967 optname, optval, len);
333fad53
YH		 968 release_sock(sk);
969 return put_user(len, optlen);
970 }
971
972 case IPV6_RECVHOPOPTS:
1da177e4
LT		 973 val = np->rxopt.bits.hopopts;
974 break;
975
333fad53
YH		 976 case IPV6_2292HOPOPTS:
977 val = np->rxopt.bits.ohopopts;
978 break;
979
980 case IPV6_RECVDSTOPTS:
1da177e4
LT		 981 val = np->rxopt.bits.dstopts;
982 break;
983
333fad53
YH		 984 case IPV6_2292DSTOPTS:
985 val = np->rxopt.bits.odstopts;
986 break;
987
41a1f8ea
YH		 988 case IPV6_TCLASS:
989 val = np->tclass;
d0ee011f
RDC		 990 if (val < 0)
991 val = 0;
41a1f8ea
YH		 992 break;
993
994 case IPV6_RECVTCLASS:
995 val = np->rxopt.bits.rxtclass;
996 break;
997
1da177e4
LT		 998 case IPV6_FLOWINFO:
999 val = np->rxopt.bits.rxflow;
1000 break;
1001
1002 case IPV6_UNICAST_HOPS:
1da177e4 1003 case IPV6_MULTICAST_HOPS:
befffe90
BH		 1004 {
1005 struct dst_entry *dst;
1006
1007 if (optname == IPV6_UNICAST_HOPS)
1008 val = np->hop_limit;
1009 else
1010 val = np->mcast_hops;
1011
1012 dst = sk_dst_get(sk);
1013 if (dst) {
1014 if (val < 0)
1015 val = dst_metric(dst, RTAX_HOPLIMIT);
1016 if (val < 0)
1017 val = ipv6_get_hoplimit(dst->dev);
1018 dst_release(dst);
1019 }
1020 if (val < 0)
1021 val = ipv6_devconf.hop_limit;
1da177e4 1022 break;
befffe90 1023 }
1da177e4
LT		 1024
1025 case IPV6_MULTICAST_LOOP:
1026 val = np->mc_loop;
1027 break;
1028
1029 case IPV6_MULTICAST_IF:
1030 val = np->mcast_oif;
1031 break;
1032
1033 case IPV6_MTU_DISCOVER:
1034 val = np->pmtudisc;
1035 break;
1036
1037 case IPV6_RECVERR:
1038 val = np->recverr;
1039 break;
1040
1041 case IPV6_FLOWINFO_SEND:
1042 val = np->sndflow;
1043 break;
1044
1045 default:
1da177e4 1046 return -EINVAL;
1da177e4
LT		 1047 }
1048 len = min_t(unsigned int, sizeof(int), len);
1049 if(put_user(len, optlen))
1050 return -EFAULT;
1051 if(copy_to_user(optval,&val,len))
1052 return -EFAULT;
1053 return 0;
1054}
1055
3fdadf7d
DM		 1056int ipv6_getsockopt(struct sock *sk, int level, int optname,
1057 char __user *optval, int __user *optlen)
1058{
1059 int err;
1060
1061 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1062 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1063
1064 if(level != SOL_IPV6)
1065 return -ENOPROTOOPT;
1066
1067 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1068#ifdef CONFIG_NETFILTER
1069 /* we need to exclude all possible EINVALs except default case */
443da0d5 1070 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
3fdadf7d
DM		 1071 optname != MCAST_MSFILTER) {
1072 int len;
1073
1074 if (get_user(len, optlen))
1075 return -EFAULT;
1076
1077 lock_sock(sk);
1078 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1079 &len);
1080 release_sock(sk);
1081 if (err >= 0)
1082 err = put_user(len, optlen);
1083 }
1084#endif
1085 return err;
1086}
1087
7159039a
YH		 1088EXPORT_SYMBOL(ipv6_getsockopt);
1089
3fdadf7d
DM		 1090#ifdef CONFIG_COMPAT
1091int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
543d9cfe 1092 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1093{
1094 int err;
1095
1096 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 1097 if (udp_prot.compat_getsockopt != NULL)
1098 return udp_prot.compat_getsockopt(sk, level, optname,
1099 optval, optlen);
1100 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1101 }
1102
543d9cfe 1103 if (level != SOL_IPV6)
3fdadf7d
DM		 1104 return -ENOPROTOOPT;
1105
1106 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1107#ifdef CONFIG_NETFILTER
1108 /* we need to exclude all possible EINVALs except default case */
443da0d5 1109 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
3fdadf7d
DM		 1110 optname != MCAST_MSFILTER) {
1111 int len;
1112
1113 if (get_user(len, optlen))
1114 return -EFAULT;
1115
1116 lock_sock(sk);
543d9cfe
ACM		 1117 err = compat_nf_getsockopt(sk, PF_INET6,
1118 optname, optval, &len);
3fdadf7d
DM		 1119 release_sock(sk);
1120 if (err >= 0)
1121 err = put_user(len, optlen);
1122 }
1123#endif
1124 return err;
1125}
543d9cfe
ACM		 1126
1127EXPORT_SYMBOL(compat_ipv6_getsockopt);
3fdadf7d
DM		 1128#endif
1129
1da177e4
LT		 1130void __init ipv6_packet_init(void)
1131{
1132 dev_add_pack(&ipv6_packet_type);
1133}
1134
1135void ipv6_packet_cleanup(void)
1136{
1137 dev_remove_pack(&ipv6_packet_type);
1138}
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