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ipv6: Check the hop limit setting in ancillary data.
[deliverable/linux.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 *
1da177e4
LT		 19 * o Truncate getsockopt returns
20 * o Return an optlen of the truncated length if need be
21 *
22 * Changes:
23 * David L Stevens <dlstevens@us.ibm.com>:
24 * - added multicast source filtering API for MLDv2
25 */
26
27#include <linux/module.h>
4fc268d2 28#include <linux/capability.h>
1da177e4
LT		 29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/socket.h>
32#include <linux/sockios.h>
1da177e4
LT		 33#include <linux/net.h>
34#include <linux/in6.h>
7bc570c8 35#include <linux/mroute6.h>
1da177e4
LT		 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 54#include <net/xfrm.h>
dae50295 55#include <net/compat.h>
1da177e4
LT		 56
57#include <asm/uaccess.h>
58
ba89966c 59DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
1da177e4 60
1da177e4
LT		 61struct ip6_ra_chain *ip6_ra_chain;
62DEFINE_RWLOCK(ip6_ra_lock);
63
64int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
65{
66 struct ip6_ra_chain *ra, *new_ra, **rap;
67
68 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
69 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
70 return -EINVAL;
71
72 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
73
74 write_lock_bh(&ip6_ra_lock);
75 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
76 if (ra->sk == sk) {
77 if (sel>=0) {
78 write_unlock_bh(&ip6_ra_lock);
a51482bd 79 kfree(new_ra);
1da177e4
LT		 80 return -EADDRINUSE;
81 }
82
83 *rap = ra->next;
84 write_unlock_bh(&ip6_ra_lock);
85
86 if (ra->destructor)
87 ra->destructor(sk);
88 sock_put(sk);
89 kfree(ra);
90 return 0;
91 }
92 }
93 if (new_ra == NULL) {
94 write_unlock_bh(&ip6_ra_lock);
95 return -ENOBUFS;
96 }
97 new_ra->sk = sk;
98 new_ra->sel = sel;
99 new_ra->destructor = destructor;
100 new_ra->next = ra;
101 *rap = new_ra;
102 sock_hold(sk);
103 write_unlock_bh(&ip6_ra_lock);
104 return 0;
105}
106
e7712f1a
YH		 107static
108struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
109 struct ipv6_txoptions *opt)
110{
111 if (inet_sk(sk)->is_icsk) {
112 if (opt &&
113 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
114 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
115 struct inet_connection_sock *icsk = inet_csk(sk);
116 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
117 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
118 }
119 opt = xchg(&inet6_sk(sk)->opt, opt);
120 } else {
121 write_lock(&sk->sk_dst_lock);
122 opt = xchg(&inet6_sk(sk)->opt, opt);
123 write_unlock(&sk->sk_dst_lock);
124 }
125 sk_dst_reset(sk);
126
127 return opt;
128}
129
3fdadf7d 130static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 131 char __user *optval, int optlen)
132{
133 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 134 struct net *net = sock_net(sk);
1da177e4
LT		 135 int val, valbool;
136 int retv = -ENOPROTOOPT;
137
1da177e4
LT		 138 if (optval == NULL)
139 val=0;
b2a9d7c2
YH		 140 else {
141 if (optlen >= sizeof(int)) {
142 if (get_user(val, (int __user *) optval))
143 return -EFAULT;
144 } else
145 val = 0;
146 }
1da177e4
LT		 147
148 valbool = (val!=0);
149
7bc570c8
YH		 150 if (ip6_mroute_opt(optname))
151 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
152
1da177e4
LT		 153 lock_sock(sk);
154
155 switch (optname) {
156
157 case IPV6_ADDRFORM:
b2a9d7c2
YH		 158 if (optlen < sizeof(int))
159 goto e_inval;
1da177e4
LT		 160 if (val == PF_INET) {
161 struct ipv6_txoptions *opt;
162 struct sk_buff *pktopt;
163
49d074f4
DL		 164 if (sk->sk_type == SOCK_RAW)
165 break;
166
9596cc82
DL		 167 if (sk->sk_protocol == IPPROTO_UDP ||
168 sk->sk_protocol == IPPROTO_UDPLITE) {
169 struct udp_sock *up = udp_sk(sk);
170 if (up->pending == AF_INET6) {
171 retv = -EBUSY;
172 break;
173 }
174 } else if (sk->sk_protocol != IPPROTO_TCP)
1da177e4
LT		 175 break;
176
177 if (sk->sk_state != TCP_ESTABLISHED) {
178 retv = -ENOTCONN;
179 break;
180 }
181
182 if (ipv6_only_sock(sk) ||
e773e4fa 183 !ipv6_addr_v4mapped(&np->daddr)) {
1da177e4
LT		 184 retv = -EADDRNOTAVAIL;
185 break;
186 }
187
188 fl6_free_socklist(sk);
189 ipv6_sock_mc_close(sk);
190
e6848976
ACM		 191 /*
192 * Sock is moving from IPv6 to IPv4 (sk_prot), so
193 * remove it from the refcnt debug socks count in the
194 * original family...
195 */
196 sk_refcnt_debug_dec(sk);
197
1da177e4 198 if (sk->sk_protocol == IPPROTO_TCP) {
d83d8461 199 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 200 local_bh_disable();
c29a0bc4
PE		 201 sock_prot_inuse_add(net, sk->sk_prot, -1);
202 sock_prot_inuse_add(net, &tcp_prot, 1);
1da177e4
LT		 203 local_bh_enable();
204 sk->sk_prot = &tcp_prot;
d83d8461 205 icsk->icsk_af_ops = &ipv4_specific;
1da177e4
LT		 206 sk->sk_socket->ops = &inet_stream_ops;
207 sk->sk_family = PF_INET;
d83d8461 208 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 209 } else {
ba4e58ec
GR		 210 struct proto *prot = &udp_prot;
211
db8dac20 212 if (sk->sk_protocol == IPPROTO_UDPLITE)
ba4e58ec 213 prot = &udplite_prot;
1da177e4 214 local_bh_disable();
c29a0bc4
PE		 215 sock_prot_inuse_add(net, sk->sk_prot, -1);
216 sock_prot_inuse_add(net, prot, 1);
1da177e4 217 local_bh_enable();
ba4e58ec 218 sk->sk_prot = prot;
1da177e4
LT		 219 sk->sk_socket->ops = &inet_dgram_ops;
220 sk->sk_family = PF_INET;
221 }
222 opt = xchg(&np->opt, NULL);
223 if (opt)
224 sock_kfree_s(sk, opt, opt->tot_len);
225 pktopt = xchg(&np->pktoptions, NULL);
226 if (pktopt)
227 kfree_skb(pktopt);
228
229 sk->sk_destruct = inet_sock_destruct;
e6848976
ACM		 230 /*
231 * ... and add it to the refcnt debug socks count
232 * in the new family. -acme
233 */
234 sk_refcnt_debug_inc(sk);
1da177e4
LT		 235 module_put(THIS_MODULE);
236 retv = 0;
237 break;
238 }
239 goto e_inval;
240
241 case IPV6_V6ONLY:
b2a9d7c2
YH		 242 if (optlen < sizeof(int) ||
243 inet_sk(sk)->num)
1da177e4
LT		 244 goto e_inval;
245 np->ipv6only = valbool;
246 retv = 0;
247 break;
248
333fad53 249 case IPV6_RECVPKTINFO:
b2a9d7c2
YH		 250 if (optlen < sizeof(int))
251 goto e_inval;
1da177e4
LT		 252 np->rxopt.bits.rxinfo = valbool;
253 retv = 0;
254 break;
1ab1457c 255
333fad53 256 case IPV6_2292PKTINFO:
b2a9d7c2
YH		 257 if (optlen < sizeof(int))
258 goto e_inval;
333fad53
YH		 259 np->rxopt.bits.rxoinfo = valbool;
260 retv = 0;
261 break;
1da177e4 262
333fad53 263 case IPV6_RECVHOPLIMIT:
b2a9d7c2
YH		 264 if (optlen < sizeof(int))
265 goto e_inval;
1da177e4
LT		 266 np->rxopt.bits.rxhlim = valbool;
267 retv = 0;
268 break;
269
333fad53 270 case IPV6_2292HOPLIMIT:
b2a9d7c2
YH		 271 if (optlen < sizeof(int))
272 goto e_inval;
333fad53
YH		 273 np->rxopt.bits.rxohlim = valbool;
274 retv = 0;
275 break;
276
277 case IPV6_RECVRTHDR:
b2a9d7c2
YH		 278 if (optlen < sizeof(int))
279 goto e_inval;
4c752098 280 np->rxopt.bits.srcrt = valbool;
1da177e4
LT		 281 retv = 0;
282 break;
283
333fad53 284 case IPV6_2292RTHDR:
b2a9d7c2
YH		 285 if (optlen < sizeof(int))
286 goto e_inval;
4c752098 287 np->rxopt.bits.osrcrt = valbool;
333fad53
YH		 288 retv = 0;
289 break;
290
291 case IPV6_RECVHOPOPTS:
b2a9d7c2
YH		 292 if (optlen < sizeof(int))
293 goto e_inval;
1da177e4
LT		 294 np->rxopt.bits.hopopts = valbool;
295 retv = 0;
296 break;
297
333fad53 298 case IPV6_2292HOPOPTS:
b2a9d7c2
YH		 299 if (optlen < sizeof(int))
300 goto e_inval;
333fad53
YH		 301 np->rxopt.bits.ohopopts = valbool;
302 retv = 0;
303 break;
304
305 case IPV6_RECVDSTOPTS:
b2a9d7c2
YH		 306 if (optlen < sizeof(int))
307 goto e_inval;
1da177e4
LT		 308 np->rxopt.bits.dstopts = valbool;
309 retv = 0;
310 break;
311
333fad53 312 case IPV6_2292DSTOPTS:
b2a9d7c2
YH		 313 if (optlen < sizeof(int))
314 goto e_inval;
333fad53
YH		 315 np->rxopt.bits.odstopts = valbool;
316 retv = 0;
317 break;
318
41a1f8ea 319 case IPV6_TCLASS:
b2a9d7c2
YH		 320 if (optlen < sizeof(int))
321 goto e_inval;
d0ee011f 322 if (val < -1 || val > 0xff)
41a1f8ea
YH		 323 goto e_inval;
324 np->tclass = val;
325 retv = 0;
326 break;
1ab1457c 327
41a1f8ea 328 case IPV6_RECVTCLASS:
b2a9d7c2
YH		 329 if (optlen < sizeof(int))
330 goto e_inval;
41a1f8ea
YH		 331 np->rxopt.bits.rxtclass = valbool;
332 retv = 0;
333 break;
334
1da177e4 335 case IPV6_FLOWINFO:
b2a9d7c2
YH		 336 if (optlen < sizeof(int))
337 goto e_inval;
1da177e4
LT		 338 np->rxopt.bits.rxflow = valbool;
339 retv = 0;
340 break;
341
333fad53
YH		 342 case IPV6_HOPOPTS:
343 case IPV6_RTHDRDSTOPTS:
344 case IPV6_RTHDR:
345 case IPV6_DSTOPTS:
346 {
347 struct ipv6_txoptions *opt;
348 if (optlen == 0)
cb422c46 349 optval = NULL;
333fad53
YH		 350
351 /* hop-by-hop / destination options are privileged option */
352 retv = -EPERM;
353 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
354 break;
355
b2a9d7c2
YH		 356 if (optlen < sizeof(struct ipv6_opt_hdr) ||
357 optlen & 0x7 || optlen > 8 * 255)
358 goto e_inval;
333fad53
YH		 359
360 opt = ipv6_renew_options(sk, np->opt, optname,
361 (struct ipv6_opt_hdr __user *)optval,
362 optlen);
363 if (IS_ERR(opt)) {
364 retv = PTR_ERR(opt);
365 break;
366 }
367
368 /* routing header option needs extra check */
dfee0a72 369 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
333fad53 370 struct ipv6_rt_hdr *rthdr = opt->srcrt;
280a9d34 371 switch (rthdr->type) {
59fbb3a6 372#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
280a9d34 373 case IPV6_SRCRT_TYPE_2:
280a9d34 374 break;
bb4dbf9e 375#endif
280a9d34 376 default:
333fad53 377 goto sticky_done;
280a9d34
MN		 378 }
379
333fad53
YH		 380 if ((rthdr->hdrlen & 1) ||
381 (rthdr->hdrlen >> 1) != rthdr->segments_left)
382 goto sticky_done;
383 }
384
385 retv = 0;
e7712f1a 386 opt = ipv6_update_options(sk, opt);
333fad53
YH		 387sticky_done:
388 if (opt)
389 sock_kfree_s(sk, opt, opt->tot_len);
390 break;
391 }
392
393 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 394 {
395 struct ipv6_txoptions *opt = NULL;
396 struct msghdr msg;
397 struct flowi fl;
398 int junk;
399
400 fl.fl6_flowlabel = 0;
401 fl.oif = sk->sk_bound_dev_if;
402
403 if (optlen == 0)
404 goto update;
405
406 /* 1K is probably excessive
407 * 1K is surely not enough, 2K per standard header is 16K.
408 */
409 retv = -EINVAL;
410 if (optlen > 64*1024)
411 break;
412
413 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
414 retv = -ENOBUFS;
415 if (opt == NULL)
416 break;
417
418 memset(opt, 0, sizeof(*opt));
419 opt->tot_len = sizeof(*opt) + optlen;
420 retv = -EFAULT;
421 if (copy_from_user(opt+1, optval, optlen))
422 goto done;
423
424 msg.msg_controllen = optlen;
425 msg.msg_control = (void*)(opt+1);
426
91e1908f 427 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
1da177e4
LT		 428 if (retv)
429 goto done;
430update:
431 retv = 0;
e7712f1a 432 opt = ipv6_update_options(sk, opt);
1da177e4
LT		 433done:
434 if (opt)
435 sock_kfree_s(sk, opt, opt->tot_len);
436 break;
437 }
438 case IPV6_UNICAST_HOPS:
b2a9d7c2
YH		 439 if (optlen < sizeof(int))
440 goto e_inval;
1da177e4
LT		 441 if (val > 255 || val < -1)
442 goto e_inval;
443 np->hop_limit = val;
444 retv = 0;
445 break;
446
447 case IPV6_MULTICAST_HOPS:
448 if (sk->sk_type == SOCK_STREAM)
449 goto e_inval;
b2a9d7c2
YH		 450 if (optlen < sizeof(int))
451 goto e_inval;
1da177e4
LT		 452 if (val > 255 || val < -1)
453 goto e_inval;
454 np->mcast_hops = val;
455 retv = 0;
456 break;
457
458 case IPV6_MULTICAST_LOOP:
b2a9d7c2
YH		 459 if (optlen < sizeof(int))
460 goto e_inval;
1da177e4
LT		 461 np->mc_loop = valbool;
462 retv = 0;
463 break;
464
465 case IPV6_MULTICAST_IF:
466 if (sk->sk_type == SOCK_STREAM)
467 goto e_inval;
b2a9d7c2
YH		 468 if (optlen < sizeof(int))
469 goto e_inval;
1da177e4 470
4953f0fc
BH		 471 if (val) {
472 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
473 goto e_inval;
474
8a3edd80 475 if (__dev_get_by_index(net, val) == NULL) {
4953f0fc
BH		 476 retv = -ENODEV;
477 break;
478 }
1da177e4
LT		 479 }
480 np->mcast_oif = val;
481 retv = 0;
482 break;
483 case IPV6_ADD_MEMBERSHIP:
484 case IPV6_DROP_MEMBERSHIP:
485 {
486 struct ipv6_mreq mreq;
487
a28398ba
WC		 488 if (optlen < sizeof(struct ipv6_mreq))
489 goto e_inval;
490
a96fb49b
FL		 491 retv = -EPROTO;
492 if (inet_sk(sk)->is_icsk)
493 break;
494
1da177e4
LT		 495 retv = -EFAULT;
496 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
497 break;
498
499 if (optname == IPV6_ADD_MEMBERSHIP)
500 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
501 else
502 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
503 break;
504 }
505 case IPV6_JOIN_ANYCAST:
506 case IPV6_LEAVE_ANYCAST:
507 {
508 struct ipv6_mreq mreq;
509
a28398ba 510 if (optlen < sizeof(struct ipv6_mreq))
1da177e4
LT		 511 goto e_inval;
512
513 retv = -EFAULT;
514 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
515 break;
516
517 if (optname == IPV6_JOIN_ANYCAST)
518 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
519 else
520 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
521 break;
522 }
523 case MCAST_JOIN_GROUP:
524 case MCAST_LEAVE_GROUP:
525 {
526 struct group_req greq;
527 struct sockaddr_in6 *psin6;
528
a28398ba
WC		 529 if (optlen < sizeof(struct group_req))
530 goto e_inval;
531
1da177e4
LT		 532 retv = -EFAULT;
533 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
534 break;
535 if (greq.gr_group.ss_family != AF_INET6) {
536 retv = -EADDRNOTAVAIL;
537 break;
538 }
539 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
540 if (optname == MCAST_JOIN_GROUP)
541 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
542 &psin6->sin6_addr);
543 else
544 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
545 &psin6->sin6_addr);
546 break;
547 }
548 case MCAST_JOIN_SOURCE_GROUP:
549 case MCAST_LEAVE_SOURCE_GROUP:
550 case MCAST_BLOCK_SOURCE:
551 case MCAST_UNBLOCK_SOURCE:
552 {
553 struct group_source_req greqs;
554 int omode, add;
555
a28398ba 556 if (optlen < sizeof(struct group_source_req))
1da177e4
LT		 557 goto e_inval;
558 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
559 retv = -EFAULT;
560 break;
561 }
562 if (greqs.gsr_group.ss_family != AF_INET6 ||
563 greqs.gsr_source.ss_family != AF_INET6) {
564 retv = -EADDRNOTAVAIL;
565 break;
566 }
567 if (optname == MCAST_BLOCK_SOURCE) {
568 omode = MCAST_EXCLUDE;
569 add = 1;
570 } else if (optname == MCAST_UNBLOCK_SOURCE) {
571 omode = MCAST_EXCLUDE;
572 add = 0;
573 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
574 struct sockaddr_in6 *psin6;
575
576 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
577 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
578 &psin6->sin6_addr);
c9e3e8b6
DS		 579 /* prior join w/ different source is ok */
580 if (retv && retv != -EADDRINUSE)
1da177e4
LT		 581 break;
582 omode = MCAST_INCLUDE;
583 add = 1;
c9e3e8b6 584 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1da177e4
LT		 585 omode = MCAST_INCLUDE;
586 add = 0;
587 }
588 retv = ip6_mc_source(add, omode, sk, &greqs);
589 break;
590 }
591 case MCAST_MSFILTER:
592 {
1da177e4
LT		 593 extern int sysctl_mld_max_msf;
594 struct group_filter *gsf;
595
596 if (optlen < GROUP_FILTER_SIZE(0))
597 goto e_inval;
598 if (optlen > sysctl_optmem_max) {
599 retv = -ENOBUFS;
600 break;
601 }
8b3a7005 602 gsf = kmalloc(optlen,GFP_KERNEL);
cfcabdcc 603 if (!gsf) {
1da177e4
LT		 604 retv = -ENOBUFS;
605 break;
606 }
607 retv = -EFAULT;
608 if (copy_from_user(gsf, optval, optlen)) {
609 kfree(gsf);
610 break;
611 }
612 /* numsrc >= (4G-140)/128 overflow in 32 bits */
613 if (gsf->gf_numsrc >= 0x1ffffffU ||
614 gsf->gf_numsrc > sysctl_mld_max_msf) {
615 kfree(gsf);
616 retv = -ENOBUFS;
617 break;
618 }
619 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
620 kfree(gsf);
621 retv = -EINVAL;
622 break;
623 }
624 retv = ip6_mc_msfilter(sk, gsf);
625 kfree(gsf);
626
627 break;
628 }
629 case IPV6_ROUTER_ALERT:
b2a9d7c2
YH		 630 if (optlen < sizeof(int))
631 goto e_inval;
1da177e4
LT		 632 retv = ip6_ra_control(sk, val, NULL);
633 break;
634 case IPV6_MTU_DISCOVER:
b2a9d7c2
YH		 635 if (optlen < sizeof(int))
636 goto e_inval;
628a5c56 637 if (val<0 || val>3)
1da177e4
LT		 638 goto e_inval;
639 np->pmtudisc = val;
640 retv = 0;
641 break;
642 case IPV6_MTU:
b2a9d7c2
YH		 643 if (optlen < sizeof(int))
644 goto e_inval;
1da177e4
LT		 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:
b2a9d7c2
YH		 651 if (optlen < sizeof(int))
652 goto e_inval;
1da177e4
LT		 653 np->recverr = valbool;
654 if (!val)
655 skb_queue_purge(&sk->sk_error_queue);
656 retv = 0;
657 break;
658 case IPV6_FLOWINFO_SEND:
b2a9d7c2
YH		 659 if (optlen < sizeof(int))
660 goto e_inval;
1da177e4
LT		 661 np->sndflow = valbool;
662 retv = 0;
663 break;
664 case IPV6_FLOWLABEL_MGR:
665 retv = ipv6_flowlabel_opt(sk, optval, optlen);
666 break;
667 case IPV6_IPSEC_POLICY:
668 case IPV6_XFRM_POLICY:
6fc0b4a7
HX		 669 retv = -EPERM;
670 if (!capable(CAP_NET_ADMIN))
671 break;
1da177e4
LT		 672 retv = xfrm_user_policy(sk, optname, optval, optlen);
673 break;
674
7cbca67c
YH		 675 case IPV6_ADDR_PREFERENCES:
676 {
677 unsigned int pref = 0;
678 unsigned int prefmask = ~0;
679
b2a9d7c2
YH		 680 if (optlen < sizeof(int))
681 goto e_inval;
682
7cbca67c
YH		 683 retv = -EINVAL;
684
685 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
686 switch (val & (IPV6_PREFER_SRC_PUBLIC|
687 IPV6_PREFER_SRC_TMP|
688 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
689 case IPV6_PREFER_SRC_PUBLIC:
690 pref |= IPV6_PREFER_SRC_PUBLIC;
691 break;
692 case IPV6_PREFER_SRC_TMP:
693 pref |= IPV6_PREFER_SRC_TMP;
694 break;
695 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
696 break;
697 case 0:
698 goto pref_skip_pubtmp;
699 default:
700 goto e_inval;
701 }
702
703 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
704 IPV6_PREFER_SRC_TMP);
705pref_skip_pubtmp:
706
707 /* check HOME/COA conflicts */
708 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
709 case IPV6_PREFER_SRC_HOME:
710 break;
711 case IPV6_PREFER_SRC_COA:
712 pref |= IPV6_PREFER_SRC_COA;
713 case 0:
714 goto pref_skip_coa;
715 default:
716 goto e_inval;
717 }
718
719 prefmask &= ~IPV6_PREFER_SRC_COA;
720pref_skip_coa:
721
722 /* check CGA/NONCGA conflicts */
723 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
724 case IPV6_PREFER_SRC_CGA:
725 case IPV6_PREFER_SRC_NONCGA:
726 case 0:
727 break;
728 default:
729 goto e_inval;
730 }
731
732 np->srcprefs = (np->srcprefs & prefmask) | pref;
733 retv = 0;
734
735 break;
736 }
1da177e4 737 }
7cbca67c 738
1da177e4
LT		 739 release_sock(sk);
740
1da177e4
LT		 741 return retv;
742
743e_inval:
744 release_sock(sk);
745 return -EINVAL;
746}
747
3fdadf7d
DM		 748int ipv6_setsockopt(struct sock *sk, int level, int optname,
749 char __user *optval, int optlen)
750{
751 int err;
752
753 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
754 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
755
756 if (level != SOL_IPV6)
757 return -ENOPROTOOPT;
758
759 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
760#ifdef CONFIG_NETFILTER
761 /* we need to exclude all possible ENOPROTOOPTs except default case */
762 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
763 optname != IPV6_XFRM_POLICY) {
764 lock_sock(sk);
765 err = nf_setsockopt(sk, PF_INET6, optname, optval,
766 optlen);
767 release_sock(sk);
768 }
769#endif
770 return err;
771}
772
7159039a 773EXPORT_SYMBOL(ipv6_setsockopt);
3fdadf7d
DM		 774
775#ifdef CONFIG_COMPAT
776int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
543d9cfe 777 char __user *optval, int optlen)
3fdadf7d
DM		 778{
779 int err;
780
781 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 782 if (udp_prot.compat_setsockopt != NULL)
783 return udp_prot.compat_setsockopt(sk, level, optname,
784 optval, optlen);
785 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 786 }
787
788 if (level != SOL_IPV6)
789 return -ENOPROTOOPT;
790
dae50295
DS		 791 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
792 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
793 ipv6_setsockopt);
794
3fdadf7d
DM		 795 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
796#ifdef CONFIG_NETFILTER
797 /* we need to exclude all possible ENOPROTOOPTs except default case */
798 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
543d9cfe 799 optname != IPV6_XFRM_POLICY) {
3fdadf7d 800 lock_sock(sk);
543d9cfe
ACM		 801 err = compat_nf_setsockopt(sk, PF_INET6, optname,
802 optval, optlen);
3fdadf7d
DM		 803 release_sock(sk);
804 }
805#endif
806 return err;
807}
543d9cfe
ACM		 808
809EXPORT_SYMBOL(compat_ipv6_setsockopt);
3fdadf7d
DM		 810#endif
811
28693079 812static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
4c6510a7 813 int optname, char __user *optval, int len)
333fad53 814{
28693079
DM		 815 struct ipv6_opt_hdr *hdr;
816
4c6510a7
YH		 817 if (!opt)
818 return 0;
819
820 switch(optname) {
821 case IPV6_HOPOPTS:
822 hdr = opt->hopopt;
823 break;
824 case IPV6_RTHDRDSTOPTS:
825 hdr = opt->dst0opt;
826 break;
827 case IPV6_RTHDR:
828 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
829 break;
830 case IPV6_DSTOPTS:
831 hdr = opt->dst1opt;
832 break;
833 default:
834 return -EINVAL; /* should not happen */
835 }
836
837 if (!hdr)
333fad53 838 return 0;
28693079 839
d2b02ed9 840 len = min_t(unsigned int, len, ipv6_optlen(hdr));
660adc6e 841 if (copy_to_user(optval, hdr, len))
333fad53 842 return -EFAULT;
95b496b6 843 return len;
333fad53
YH		 844}
845
3fdadf7d 846static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 847 char __user *optval, int __user *optlen)
848{
849 struct ipv6_pinfo *np = inet6_sk(sk);
850 int len;
851 int val;
852
7bc570c8
YH		 853 if (ip6_mroute_opt(optname))
854 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
855
1da177e4
LT		 856 if (get_user(len, optlen))
857 return -EFAULT;
858 switch (optname) {
859 case IPV6_ADDRFORM:
860 if (sk->sk_protocol != IPPROTO_UDP &&
ba4e58ec 861 sk->sk_protocol != IPPROTO_UDPLITE &&
1da177e4
LT		 862 sk->sk_protocol != IPPROTO_TCP)
863 return -EINVAL;
864 if (sk->sk_state != TCP_ESTABLISHED)
865 return -ENOTCONN;
866 val = sk->sk_family;
867 break;
868 case MCAST_MSFILTER:
869 {
870 struct group_filter gsf;
871 int err;
872
873 if (len < GROUP_FILTER_SIZE(0))
874 return -EINVAL;
875 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
876 return -EFAULT;
20c61fbd
YH		 877 if (gsf.gf_group.ss_family != AF_INET6)
878 return -EADDRNOTAVAIL;
1da177e4
LT		 879 lock_sock(sk);
880 err = ip6_mc_msfget(sk, &gsf,
881 (struct group_filter __user *)optval, optlen);
882 release_sock(sk);
883 return err;
884 }
885
333fad53 886 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 887 {
888 struct msghdr msg;
889 struct sk_buff *skb;
890
891 if (sk->sk_type != SOCK_STREAM)
892 return -ENOPROTOOPT;
893
894 msg.msg_control = optval;
895 msg.msg_controllen = len;
896 msg.msg_flags = 0;
897
898 lock_sock(sk);
899 skb = np->pktoptions;
900 if (skb)
901 atomic_inc(&skb->users);
902 release_sock(sk);
903
904 if (skb) {
905 int err = datagram_recv_ctl(sk, &msg, skb);
906 kfree_skb(skb);
907 if (err)
908 return err;
909 } else {
910 if (np->rxopt.bits.rxinfo) {
911 struct in6_pktinfo src_info;
912 src_info.ipi6_ifindex = np->mcast_oif;
913 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
914 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
915 }
916 if (np->rxopt.bits.rxhlim) {
917 int hlim = np->mcast_hops;
918 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
919 }
333fad53
YH		 920 if (np->rxopt.bits.rxoinfo) {
921 struct in6_pktinfo src_info;
922 src_info.ipi6_ifindex = np->mcast_oif;
923 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
924 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
925 }
926 if (np->rxopt.bits.rxohlim) {
927 int hlim = np->mcast_hops;
928 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
929 }
1da177e4
LT		 930 }
931 len -= msg.msg_controllen;
932 return put_user(len, optlen);
933 }
934 case IPV6_MTU:
935 {
936 struct dst_entry *dst;
1ab1457c 937 val = 0;
1da177e4
LT		 938 lock_sock(sk);
939 dst = sk_dst_get(sk);
940 if (dst) {
941 val = dst_mtu(dst);
942 dst_release(dst);
943 }
944 release_sock(sk);
945 if (!val)
946 return -ENOTCONN;
947 break;
948 }
949
950 case IPV6_V6ONLY:
951 val = np->ipv6only;
952 break;
953
333fad53 954 case IPV6_RECVPKTINFO:
1da177e4
LT		 955 val = np->rxopt.bits.rxinfo;
956 break;
957
333fad53
YH		 958 case IPV6_2292PKTINFO:
959 val = np->rxopt.bits.rxoinfo;
960 break;
961
962 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 963 val = np->rxopt.bits.rxhlim;
964 break;
965
333fad53
YH		 966 case IPV6_2292HOPLIMIT:
967 val = np->rxopt.bits.rxohlim;
968 break;
969
970 case IPV6_RECVRTHDR:
1da177e4
LT		 971 val = np->rxopt.bits.srcrt;
972 break;
973
333fad53
YH		 974 case IPV6_2292RTHDR:
975 val = np->rxopt.bits.osrcrt;
976 break;
977
1da177e4 978 case IPV6_HOPOPTS:
333fad53
YH		 979 case IPV6_RTHDRDSTOPTS:
980 case IPV6_RTHDR:
981 case IPV6_DSTOPTS:
982 {
983
984 lock_sock(sk);
28693079 985 len = ipv6_getsockopt_sticky(sk, np->opt,
4c6510a7 986 optname, optval, len);
333fad53 987 release_sock(sk);
05335c22
YH		 988 /* check if ipv6_getsockopt_sticky() returns err code */
989 if (len < 0)
990 return len;
333fad53
YH		 991 return put_user(len, optlen);
992 }
993
994 case IPV6_RECVHOPOPTS:
1da177e4
LT		 995 val = np->rxopt.bits.hopopts;
996 break;
997
333fad53
YH		 998 case IPV6_2292HOPOPTS:
999 val = np->rxopt.bits.ohopopts;
1000 break;
1001
1002 case IPV6_RECVDSTOPTS:
1da177e4
LT		 1003 val = np->rxopt.bits.dstopts;
1004 break;
1005
333fad53
YH		 1006 case IPV6_2292DSTOPTS:
1007 val = np->rxopt.bits.odstopts;
1008 break;
1009
41a1f8ea
YH		 1010 case IPV6_TCLASS:
1011 val = np->tclass;
d0ee011f
RDC		 1012 if (val < 0)
1013 val = 0;
41a1f8ea
YH		 1014 break;
1015
1016 case IPV6_RECVTCLASS:
1017 val = np->rxopt.bits.rxtclass;
1018 break;
1019
1da177e4
LT		 1020 case IPV6_FLOWINFO:
1021 val = np->rxopt.bits.rxflow;
1022 break;
1023
1024 case IPV6_UNICAST_HOPS:
1da177e4 1025 case IPV6_MULTICAST_HOPS:
befffe90
BH		 1026 {
1027 struct dst_entry *dst;
1028
1029 if (optname == IPV6_UNICAST_HOPS)
1030 val = np->hop_limit;
1031 else
1032 val = np->mcast_hops;
1033
1034 dst = sk_dst_get(sk);
1035 if (dst) {
1036 if (val < 0)
6b75d090 1037 val = ip6_dst_hoplimit(dst);
befffe90
BH		 1038 dst_release(dst);
1039 }
1040 if (val < 0)
1041 val = ipv6_devconf.hop_limit;
1da177e4 1042 break;
befffe90 1043 }
1da177e4
LT		 1044
1045 case IPV6_MULTICAST_LOOP:
1046 val = np->mc_loop;
1047 break;
1048
1049 case IPV6_MULTICAST_IF:
1050 val = np->mcast_oif;
1051 break;
1052
1053 case IPV6_MTU_DISCOVER:
1054 val = np->pmtudisc;
1055 break;
1056
1057 case IPV6_RECVERR:
1058 val = np->recverr;
1059 break;
1060
1061 case IPV6_FLOWINFO_SEND:
1062 val = np->sndflow;
1063 break;
1064
7cbca67c
YH		 1065 case IPV6_ADDR_PREFERENCES:
1066 val = 0;
1067
1068 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1069 val |= IPV6_PREFER_SRC_TMP;
1070 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1071 val |= IPV6_PREFER_SRC_PUBLIC;
1072 else {
1073 /* XXX: should we return system default? */
1074 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1075 }
1076
1077 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1078 val |= IPV6_PREFER_SRC_COA;
1079 else
1080 val |= IPV6_PREFER_SRC_HOME;
1081 break;
1082
1da177e4 1083 default:
cf6fc4a9 1084 return -ENOPROTOOPT;
1da177e4
LT		 1085 }
1086 len = min_t(unsigned int, sizeof(int), len);
1087 if(put_user(len, optlen))
1088 return -EFAULT;
1089 if(copy_to_user(optval,&val,len))
1090 return -EFAULT;
1091 return 0;
1092}
1093
3fdadf7d
DM		 1094int ipv6_getsockopt(struct sock *sk, int level, int optname,
1095 char __user *optval, int __user *optlen)
1096{
1097 int err;
1098
1099 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1100 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1101
1102 if(level != SOL_IPV6)
1103 return -ENOPROTOOPT;
1104
1105 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1106#ifdef CONFIG_NETFILTER
cf6fc4a9
WY		 1107 /* we need to exclude all possible ENOPROTOOPTs except default case */
1108 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
3fdadf7d
DM		 1109 int len;
1110
1111 if (get_user(len, optlen))
1112 return -EFAULT;
1113
1114 lock_sock(sk);
1115 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1116 &len);
1117 release_sock(sk);
1118 if (err >= 0)
1119 err = put_user(len, optlen);
1120 }
1121#endif
1122 return err;
1123}
1124
7159039a
YH		 1125EXPORT_SYMBOL(ipv6_getsockopt);
1126
3fdadf7d
DM		 1127#ifdef CONFIG_COMPAT
1128int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
543d9cfe 1129 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1130{
1131 int err;
1132
1133 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
543d9cfe
ACM		 1134 if (udp_prot.compat_getsockopt != NULL)
1135 return udp_prot.compat_getsockopt(sk, level, optname,
1136 optval, optlen);
1137 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1138 }
1139
543d9cfe 1140 if (level != SOL_IPV6)
3fdadf7d
DM		 1141 return -ENOPROTOOPT;
1142
80991790
PE		 1143 if (optname == MCAST_MSFILTER)
1144 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1145 ipv6_getsockopt);
1146
3fdadf7d
DM		 1147 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1148#ifdef CONFIG_NETFILTER
cf6fc4a9
WY		 1149 /* we need to exclude all possible ENOPROTOOPTs except default case */
1150 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
3fdadf7d
DM		 1151 int len;
1152
1153 if (get_user(len, optlen))
1154 return -EFAULT;
1155
1156 lock_sock(sk);
543d9cfe
ACM		 1157 err = compat_nf_getsockopt(sk, PF_INET6,
1158 optname, optval, &len);
3fdadf7d
DM		 1159 release_sock(sk);
1160 if (err >= 0)
1161 err = put_user(len, optlen);
1162 }
1163#endif
1164 return err;
1165}
543d9cfe
ACM		 1166
1167EXPORT_SYMBOL(compat_ipv6_getsockopt);
3fdadf7d
DM		 1168#endif
1169
Linux kernel - Deliverables
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