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[IPV6]: Do not change protocol for raw IPv6 sockets.
[linux-2.6/mini2440.git] / net / ipv6 / ipv6_sockglue.c
blob1afe210d62861a295af673fcc0e3bad1d925a553
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 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>
28 #include <linux/capability.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/mroute6.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 #include <net/compat.h>
56
57 #include <asm/uaccess.h>
58
59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
60
61 struct ip6_ra_chain *ip6_ra_chain;
62 DEFINE_RWLOCK(ip6_ra_lock);
63
64 int 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);
79 kfree(new_ra);
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
107 static
108 struct 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
130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
131 char __user *optval, int optlen)
132 {
133 struct ipv6_pinfo *np = inet6_sk(sk);
134 struct net *net = sock_net(sk);
135 int val, valbool;
136 int retv = -ENOPROTOOPT;
137
138 if (optval == NULL)
139 val=0;
140 else {
141 if (optlen >= sizeof(int)) {
142 if (get_user(val, (int __user *) optval))
143 return -EFAULT;
144 } else
145 val = 0;
146 }
147
148 valbool = (val!=0);
149
150 if (ip6_mroute_opt(optname))
151 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
152
153 lock_sock(sk);
154
155 switch (optname) {
156
157 case IPV6_ADDRFORM:
158 if (optlen < sizeof(int))
159 goto e_inval;
160 if (val == PF_INET) {
161 struct ipv6_txoptions *opt;
162 struct sk_buff *pktopt;
163
164 if (sk->sk_type == SOCK_RAW)
165 break;
166
167 if (sk->sk_protocol != IPPROTO_UDP &&
168 sk->sk_protocol != IPPROTO_UDPLITE &&
169 sk->sk_protocol != IPPROTO_TCP)
170 break;
171
172 if (sk->sk_state != TCP_ESTABLISHED) {
173 retv = -ENOTCONN;
174 break;
175 }
176
177 if (ipv6_only_sock(sk) ||
178 !ipv6_addr_v4mapped(&np->daddr)) {
179 retv = -EADDRNOTAVAIL;
180 break;
181 }
182
183 fl6_free_socklist(sk);
184 ipv6_sock_mc_close(sk);
185
186 /*
187 * Sock is moving from IPv6 to IPv4 (sk_prot), so
188 * remove it from the refcnt debug socks count in the
189 * original family...
190 */
191 sk_refcnt_debug_dec(sk);
192
193 if (sk->sk_protocol == IPPROTO_TCP) {
194 struct inet_connection_sock *icsk = inet_csk(sk);
195 local_bh_disable();
196 sock_prot_inuse_add(net, sk->sk_prot, -1);
197 sock_prot_inuse_add(net, &tcp_prot, 1);
198 local_bh_enable();
199 sk->sk_prot = &tcp_prot;
200 icsk->icsk_af_ops = &ipv4_specific;
201 sk->sk_socket->ops = &inet_stream_ops;
202 sk->sk_family = PF_INET;
203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
204 } else {
205 struct proto *prot = &udp_prot;
206
207 if (sk->sk_protocol == IPPROTO_UDPLITE)
208 prot = &udplite_prot;
209 local_bh_disable();
210 sock_prot_inuse_add(net, sk->sk_prot, -1);
211 sock_prot_inuse_add(net, prot, 1);
212 local_bh_enable();
213 sk->sk_prot = prot;
214 sk->sk_socket->ops = &inet_dgram_ops;
215 sk->sk_family = PF_INET;
216 }
217 opt = xchg(&np->opt, NULL);
218 if (opt)
219 sock_kfree_s(sk, opt, opt->tot_len);
220 pktopt = xchg(&np->pktoptions, NULL);
221 if (pktopt)
222 kfree_skb(pktopt);
223
224 sk->sk_destruct = inet_sock_destruct;
225 /*
226 * ... and add it to the refcnt debug socks count
227 * in the new family. -acme
228 */
229 sk_refcnt_debug_inc(sk);
230 module_put(THIS_MODULE);
231 retv = 0;
232 break;
233 }
234 goto e_inval;
235
236 case IPV6_V6ONLY:
237 if (optlen < sizeof(int) ||
238 inet_sk(sk)->num)
239 goto e_inval;
240 np->ipv6only = valbool;
241 retv = 0;
242 break;
243
244 case IPV6_RECVPKTINFO:
245 if (optlen < sizeof(int))
246 goto e_inval;
247 np->rxopt.bits.rxinfo = valbool;
248 retv = 0;
249 break;
250
251 case IPV6_2292PKTINFO:
252 if (optlen < sizeof(int))
253 goto e_inval;
254 np->rxopt.bits.rxoinfo = valbool;
255 retv = 0;
256 break;
257
258 case IPV6_RECVHOPLIMIT:
259 if (optlen < sizeof(int))
260 goto e_inval;
261 np->rxopt.bits.rxhlim = valbool;
262 retv = 0;
263 break;
264
265 case IPV6_2292HOPLIMIT:
266 if (optlen < sizeof(int))
267 goto e_inval;
268 np->rxopt.bits.rxohlim = valbool;
269 retv = 0;
270 break;
271
272 case IPV6_RECVRTHDR:
273 if (optlen < sizeof(int))
274 goto e_inval;
275 np->rxopt.bits.srcrt = valbool;
276 retv = 0;
277 break;
278
279 case IPV6_2292RTHDR:
280 if (optlen < sizeof(int))
281 goto e_inval;
282 np->rxopt.bits.osrcrt = valbool;
283 retv = 0;
284 break;
285
286 case IPV6_RECVHOPOPTS:
287 if (optlen < sizeof(int))
288 goto e_inval;
289 np->rxopt.bits.hopopts = valbool;
290 retv = 0;
291 break;
292
293 case IPV6_2292HOPOPTS:
294 if (optlen < sizeof(int))
295 goto e_inval;
296 np->rxopt.bits.ohopopts = valbool;
297 retv = 0;
298 break;
299
300 case IPV6_RECVDSTOPTS:
301 if (optlen < sizeof(int))
302 goto e_inval;
303 np->rxopt.bits.dstopts = valbool;
304 retv = 0;
305 break;
306
307 case IPV6_2292DSTOPTS:
308 if (optlen < sizeof(int))
309 goto e_inval;
310 np->rxopt.bits.odstopts = valbool;
311 retv = 0;
312 break;
313
314 case IPV6_TCLASS:
315 if (optlen < sizeof(int))
316 goto e_inval;
317 if (val < -1 || val > 0xff)
318 goto e_inval;
319 np->tclass = val;
320 retv = 0;
321 break;
322
323 case IPV6_RECVTCLASS:
324 if (optlen < sizeof(int))
325 goto e_inval;
326 np->rxopt.bits.rxtclass = valbool;
327 retv = 0;
328 break;
329
330 case IPV6_FLOWINFO:
331 if (optlen < sizeof(int))
332 goto e_inval;
333 np->rxopt.bits.rxflow = valbool;
334 retv = 0;
335 break;
336
337 case IPV6_HOPOPTS:
338 case IPV6_RTHDRDSTOPTS:
339 case IPV6_RTHDR:
340 case IPV6_DSTOPTS:
341 {
342 struct ipv6_txoptions *opt;
343 if (optlen == 0)
344 optval = NULL;
345
346 /* hop-by-hop / destination options are privileged option */
347 retv = -EPERM;
348 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
349 break;
350
351 if (optlen < sizeof(struct ipv6_opt_hdr) ||
352 optlen & 0x7 || optlen > 8 * 255)
353 goto e_inval;
354
355 opt = ipv6_renew_options(sk, np->opt, optname,
356 (struct ipv6_opt_hdr __user *)optval,
357 optlen);
358 if (IS_ERR(opt)) {
359 retv = PTR_ERR(opt);
360 break;
361 }
362
363 /* routing header option needs extra check */
364 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
365 struct ipv6_rt_hdr *rthdr = opt->srcrt;
366 switch (rthdr->type) {
367 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
368 case IPV6_SRCRT_TYPE_2:
369 break;
370 #endif
371 default:
372 goto sticky_done;
373 }
374
375 if ((rthdr->hdrlen & 1) ||
376 (rthdr->hdrlen >> 1) != rthdr->segments_left)
377 goto sticky_done;
378 }
379
380 retv = 0;
381 opt = ipv6_update_options(sk, opt);
382 sticky_done:
383 if (opt)
384 sock_kfree_s(sk, opt, opt->tot_len);
385 break;
386 }
387
388 case IPV6_2292PKTOPTIONS:
389 {
390 struct ipv6_txoptions *opt = NULL;
391 struct msghdr msg;
392 struct flowi fl;
393 int junk;
394
395 fl.fl6_flowlabel = 0;
396 fl.oif = sk->sk_bound_dev_if;
397
398 if (optlen == 0)
399 goto update;
400
401 /* 1K is probably excessive
402 * 1K is surely not enough, 2K per standard header is 16K.
403 */
404 retv = -EINVAL;
405 if (optlen > 64*1024)
406 break;
407
408 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
409 retv = -ENOBUFS;
410 if (opt == NULL)
411 break;
412
413 memset(opt, 0, sizeof(*opt));
414 opt->tot_len = sizeof(*opt) + optlen;
415 retv = -EFAULT;
416 if (copy_from_user(opt+1, optval, optlen))
417 goto done;
418
419 msg.msg_controllen = optlen;
420 msg.msg_control = (void*)(opt+1);
421
422 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
423 if (retv)
424 goto done;
425 update:
426 retv = 0;
427 opt = ipv6_update_options(sk, opt);
428 done:
429 if (opt)
430 sock_kfree_s(sk, opt, opt->tot_len);
431 break;
432 }
433 case IPV6_UNICAST_HOPS:
434 if (optlen < sizeof(int))
435 goto e_inval;
436 if (val > 255 || val < -1)
437 goto e_inval;
438 np->hop_limit = val;
439 retv = 0;
440 break;
441
442 case IPV6_MULTICAST_HOPS:
443 if (sk->sk_type == SOCK_STREAM)
444 goto e_inval;
445 if (optlen < sizeof(int))
446 goto e_inval;
447 if (val > 255 || val < -1)
448 goto e_inval;
449 np->mcast_hops = val;
450 retv = 0;
451 break;
452
453 case IPV6_MULTICAST_LOOP:
454 if (optlen < sizeof(int))
455 goto e_inval;
456 np->mc_loop = valbool;
457 retv = 0;
458 break;
459
460 case IPV6_MULTICAST_IF:
461 if (sk->sk_type == SOCK_STREAM)
462 goto e_inval;
463 if (optlen < sizeof(int))
464 goto e_inval;
465
466 if (val) {
467 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
468 goto e_inval;
469
470 if (__dev_get_by_index(net, val) == NULL) {
471 retv = -ENODEV;
472 break;
473 }
474 }
475 np->mcast_oif = val;
476 retv = 0;
477 break;
478 case IPV6_ADD_MEMBERSHIP:
479 case IPV6_DROP_MEMBERSHIP:
480 {
481 struct ipv6_mreq mreq;
482
483 if (optlen < sizeof(struct ipv6_mreq))
484 goto e_inval;
485
486 retv = -EPROTO;
487 if (inet_sk(sk)->is_icsk)
488 break;
489
490 retv = -EFAULT;
491 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
492 break;
493
494 if (optname == IPV6_ADD_MEMBERSHIP)
495 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
496 else
497 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
498 break;
499 }
500 case IPV6_JOIN_ANYCAST:
501 case IPV6_LEAVE_ANYCAST:
502 {
503 struct ipv6_mreq mreq;
504
505 if (optlen < sizeof(struct ipv6_mreq))
506 goto e_inval;
507
508 retv = -EFAULT;
509 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
510 break;
511
512 if (optname == IPV6_JOIN_ANYCAST)
513 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
514 else
515 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
516 break;
517 }
518 case MCAST_JOIN_GROUP:
519 case MCAST_LEAVE_GROUP:
520 {
521 struct group_req greq;
522 struct sockaddr_in6 *psin6;
523
524 if (optlen < sizeof(struct group_req))
525 goto e_inval;
526
527 retv = -EFAULT;
528 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
529 break;
530 if (greq.gr_group.ss_family != AF_INET6) {
531 retv = -EADDRNOTAVAIL;
532 break;
533 }
534 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
535 if (optname == MCAST_JOIN_GROUP)
536 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
537 &psin6->sin6_addr);
538 else
539 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
540 &psin6->sin6_addr);
541 break;
542 }
543 case MCAST_JOIN_SOURCE_GROUP:
544 case MCAST_LEAVE_SOURCE_GROUP:
545 case MCAST_BLOCK_SOURCE:
546 case MCAST_UNBLOCK_SOURCE:
547 {
548 struct group_source_req greqs;
549 int omode, add;
550
551 if (optlen < sizeof(struct group_source_req))
552 goto e_inval;
553 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
554 retv = -EFAULT;
555 break;
556 }
557 if (greqs.gsr_group.ss_family != AF_INET6 ||
558 greqs.gsr_source.ss_family != AF_INET6) {
559 retv = -EADDRNOTAVAIL;
560 break;
561 }
562 if (optname == MCAST_BLOCK_SOURCE) {
563 omode = MCAST_EXCLUDE;
564 add = 1;
565 } else if (optname == MCAST_UNBLOCK_SOURCE) {
566 omode = MCAST_EXCLUDE;
567 add = 0;
568 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
569 struct sockaddr_in6 *psin6;
570
571 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
572 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
573 &psin6->sin6_addr);
574 /* prior join w/ different source is ok */
575 if (retv && retv != -EADDRINUSE)
576 break;
577 omode = MCAST_INCLUDE;
578 add = 1;
579 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
580 omode = MCAST_INCLUDE;
581 add = 0;
582 }
583 retv = ip6_mc_source(add, omode, sk, &greqs);
584 break;
585 }
586 case MCAST_MSFILTER:
587 {
588 extern int sysctl_mld_max_msf;
589 struct group_filter *gsf;
590
591 if (optlen < GROUP_FILTER_SIZE(0))
592 goto e_inval;
593 if (optlen > sysctl_optmem_max) {
594 retv = -ENOBUFS;
595 break;
596 }
597 gsf = kmalloc(optlen,GFP_KERNEL);
598 if (!gsf) {
599 retv = -ENOBUFS;
600 break;
601 }
602 retv = -EFAULT;
603 if (copy_from_user(gsf, optval, optlen)) {
604 kfree(gsf);
605 break;
606 }
607 /* numsrc >= (4G-140)/128 overflow in 32 bits */
608 if (gsf->gf_numsrc >= 0x1ffffffU ||
609 gsf->gf_numsrc > sysctl_mld_max_msf) {
610 kfree(gsf);
611 retv = -ENOBUFS;
612 break;
613 }
614 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
615 kfree(gsf);
616 retv = -EINVAL;
617 break;
618 }
619 retv = ip6_mc_msfilter(sk, gsf);
620 kfree(gsf);
621
622 break;
623 }
624 case IPV6_ROUTER_ALERT:
625 if (optlen < sizeof(int))
626 goto e_inval;
627 retv = ip6_ra_control(sk, val, NULL);
628 break;
629 case IPV6_MTU_DISCOVER:
630 if (optlen < sizeof(int))
631 goto e_inval;
632 if (val<0 || val>3)
633 goto e_inval;
634 np->pmtudisc = val;
635 retv = 0;
636 break;
637 case IPV6_MTU:
638 if (optlen < sizeof(int))
639 goto e_inval;
640 if (val && val < IPV6_MIN_MTU)
641 goto e_inval;
642 np->frag_size = val;
643 retv = 0;
644 break;
645 case IPV6_RECVERR:
646 if (optlen < sizeof(int))
647 goto e_inval;
648 np->recverr = valbool;
649 if (!val)
650 skb_queue_purge(&sk->sk_error_queue);
651 retv = 0;
652 break;
653 case IPV6_FLOWINFO_SEND:
654 if (optlen < sizeof(int))
655 goto e_inval;
656 np->sndflow = valbool;
657 retv = 0;
658 break;
659 case IPV6_FLOWLABEL_MGR:
660 retv = ipv6_flowlabel_opt(sk, optval, optlen);
661 break;
662 case IPV6_IPSEC_POLICY:
663 case IPV6_XFRM_POLICY:
664 retv = -EPERM;
665 if (!capable(CAP_NET_ADMIN))
666 break;
667 retv = xfrm_user_policy(sk, optname, optval, optlen);
668 break;
669
670 case IPV6_ADDR_PREFERENCES:
671 {
672 unsigned int pref = 0;
673 unsigned int prefmask = ~0;
674
675 if (optlen < sizeof(int))
676 goto e_inval;
677
678 retv = -EINVAL;
679
680 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
681 switch (val & (IPV6_PREFER_SRC_PUBLIC|
682 IPV6_PREFER_SRC_TMP|
683 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
684 case IPV6_PREFER_SRC_PUBLIC:
685 pref |= IPV6_PREFER_SRC_PUBLIC;
686 break;
687 case IPV6_PREFER_SRC_TMP:
688 pref |= IPV6_PREFER_SRC_TMP;
689 break;
690 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
691 break;
692 case 0:
693 goto pref_skip_pubtmp;
694 default:
695 goto e_inval;
696 }
697
698 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
699 IPV6_PREFER_SRC_TMP);
700 pref_skip_pubtmp:
701
702 /* check HOME/COA conflicts */
703 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
704 case IPV6_PREFER_SRC_HOME:
705 break;
706 case IPV6_PREFER_SRC_COA:
707 pref |= IPV6_PREFER_SRC_COA;
708 case 0:
709 goto pref_skip_coa;
710 default:
711 goto e_inval;
712 }
713
714 prefmask &= ~IPV6_PREFER_SRC_COA;
715 pref_skip_coa:
716
717 /* check CGA/NONCGA conflicts */
718 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
719 case IPV6_PREFER_SRC_CGA:
720 case IPV6_PREFER_SRC_NONCGA:
721 case 0:
722 break;
723 default:
724 goto e_inval;
725 }
726
727 np->srcprefs = (np->srcprefs & prefmask) | pref;
728 retv = 0;
729
730 break;
731 }
732 }
733
734 release_sock(sk);
735
736 return retv;
737
738 e_inval:
739 release_sock(sk);
740 return -EINVAL;
741 }
742
743 int ipv6_setsockopt(struct sock *sk, int level, int optname,
744 char __user *optval, int optlen)
745 {
746 int err;
747
748 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
749 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
750
751 if (level != SOL_IPV6)
752 return -ENOPROTOOPT;
753
754 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
755 #ifdef CONFIG_NETFILTER
756 /* we need to exclude all possible ENOPROTOOPTs except default case */
757 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
758 optname != IPV6_XFRM_POLICY) {
759 lock_sock(sk);
760 err = nf_setsockopt(sk, PF_INET6, optname, optval,
761 optlen);
762 release_sock(sk);
763 }
764 #endif
765 return err;
766 }
767
768 EXPORT_SYMBOL(ipv6_setsockopt);
769
770 #ifdef CONFIG_COMPAT
771 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
772 char __user *optval, int optlen)
773 {
774 int err;
775
776 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
777 if (udp_prot.compat_setsockopt != NULL)
778 return udp_prot.compat_setsockopt(sk, level, optname,
779 optval, optlen);
780 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
781 }
782
783 if (level != SOL_IPV6)
784 return -ENOPROTOOPT;
785
786 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
787 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
788 ipv6_setsockopt);
789
790 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
791 #ifdef CONFIG_NETFILTER
792 /* we need to exclude all possible ENOPROTOOPTs except default case */
793 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
794 optname != IPV6_XFRM_POLICY) {
795 lock_sock(sk);
796 err = compat_nf_setsockopt(sk, PF_INET6, optname,
797 optval, optlen);
798 release_sock(sk);
799 }
800 #endif
801 return err;
802 }
803
804 EXPORT_SYMBOL(compat_ipv6_setsockopt);
805 #endif
806
807 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
808 int optname, char __user *optval, int len)
809 {
810 struct ipv6_opt_hdr *hdr;
811
812 if (!opt)
813 return 0;
814
815 switch(optname) {
816 case IPV6_HOPOPTS:
817 hdr = opt->hopopt;
818 break;
819 case IPV6_RTHDRDSTOPTS:
820 hdr = opt->dst0opt;
821 break;
822 case IPV6_RTHDR:
823 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
824 break;
825 case IPV6_DSTOPTS:
826 hdr = opt->dst1opt;
827 break;
828 default:
829 return -EINVAL; /* should not happen */
830 }
831
832 if (!hdr)
833 return 0;
834
835 len = min_t(unsigned int, len, ipv6_optlen(hdr));
836 if (copy_to_user(optval, hdr, len))
837 return -EFAULT;
838 return len;
839 }
840
841 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
842 char __user *optval, int __user *optlen)
843 {
844 struct ipv6_pinfo *np = inet6_sk(sk);
845 int len;
846 int val;
847
848 if (ip6_mroute_opt(optname))
849 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
850
851 if (get_user(len, optlen))
852 return -EFAULT;
853 switch (optname) {
854 case IPV6_ADDRFORM:
855 if (sk->sk_protocol != IPPROTO_UDP &&
856 sk->sk_protocol != IPPROTO_UDPLITE &&
857 sk->sk_protocol != IPPROTO_TCP)
858 return -EINVAL;
859 if (sk->sk_state != TCP_ESTABLISHED)
860 return -ENOTCONN;
861 val = sk->sk_family;
862 break;
863 case MCAST_MSFILTER:
864 {
865 struct group_filter gsf;
866 int err;
867
868 if (len < GROUP_FILTER_SIZE(0))
869 return -EINVAL;
870 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
871 return -EFAULT;
872 lock_sock(sk);
873 err = ip6_mc_msfget(sk, &gsf,
874 (struct group_filter __user *)optval, optlen);
875 release_sock(sk);
876 return err;
877 }
878
879 case IPV6_2292PKTOPTIONS:
880 {
881 struct msghdr msg;
882 struct sk_buff *skb;
883
884 if (sk->sk_type != SOCK_STREAM)
885 return -ENOPROTOOPT;
886
887 msg.msg_control = optval;
888 msg.msg_controllen = len;
889 msg.msg_flags = 0;
890
891 lock_sock(sk);
892 skb = np->pktoptions;
893 if (skb)
894 atomic_inc(&skb->users);
895 release_sock(sk);
896
897 if (skb) {
898 int err = datagram_recv_ctl(sk, &msg, skb);
899 kfree_skb(skb);
900 if (err)
901 return err;
902 } else {
903 if (np->rxopt.bits.rxinfo) {
904 struct in6_pktinfo src_info;
905 src_info.ipi6_ifindex = np->mcast_oif;
906 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
907 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
908 }
909 if (np->rxopt.bits.rxhlim) {
910 int hlim = np->mcast_hops;
911 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
912 }
913 if (np->rxopt.bits.rxoinfo) {
914 struct in6_pktinfo src_info;
915 src_info.ipi6_ifindex = np->mcast_oif;
916 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
917 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
918 }
919 if (np->rxopt.bits.rxohlim) {
920 int hlim = np->mcast_hops;
921 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
922 }
923 }
924 len -= msg.msg_controllen;
925 return put_user(len, optlen);
926 }
927 case IPV6_MTU:
928 {
929 struct dst_entry *dst;
930 val = 0;
931 lock_sock(sk);
932 dst = sk_dst_get(sk);
933 if (dst) {
934 val = dst_mtu(dst);
935 dst_release(dst);
936 }
937 release_sock(sk);
938 if (!val)
939 return -ENOTCONN;
940 break;
941 }
942
943 case IPV6_V6ONLY:
944 val = np->ipv6only;
945 break;
946
947 case IPV6_RECVPKTINFO:
948 val = np->rxopt.bits.rxinfo;
949 break;
950
951 case IPV6_2292PKTINFO:
952 val = np->rxopt.bits.rxoinfo;
953 break;
954
955 case IPV6_RECVHOPLIMIT:
956 val = np->rxopt.bits.rxhlim;
957 break;
958
959 case IPV6_2292HOPLIMIT:
960 val = np->rxopt.bits.rxohlim;
961 break;
962
963 case IPV6_RECVRTHDR:
964 val = np->rxopt.bits.srcrt;
965 break;
966
967 case IPV6_2292RTHDR:
968 val = np->rxopt.bits.osrcrt;
969 break;
970
971 case IPV6_HOPOPTS:
972 case IPV6_RTHDRDSTOPTS:
973 case IPV6_RTHDR:
974 case IPV6_DSTOPTS:
975 {
976
977 lock_sock(sk);
978 len = ipv6_getsockopt_sticky(sk, np->opt,
979 optname, optval, len);
980 release_sock(sk);
981 /* check if ipv6_getsockopt_sticky() returns err code */
982 if (len < 0)
983 return len;
984 return put_user(len, optlen);
985 }
986
987 case IPV6_RECVHOPOPTS:
988 val = np->rxopt.bits.hopopts;
989 break;
990
991 case IPV6_2292HOPOPTS:
992 val = np->rxopt.bits.ohopopts;
993 break;
994
995 case IPV6_RECVDSTOPTS:
996 val = np->rxopt.bits.dstopts;
997 break;
998
999 case IPV6_2292DSTOPTS:
1000 val = np->rxopt.bits.odstopts;
1001 break;
1002
1003 case IPV6_TCLASS:
1004 val = np->tclass;
1005 if (val < 0)
1006 val = 0;
1007 break;
1008
1009 case IPV6_RECVTCLASS:
1010 val = np->rxopt.bits.rxtclass;
1011 break;
1012
1013 case IPV6_FLOWINFO:
1014 val = np->rxopt.bits.rxflow;
1015 break;
1016
1017 case IPV6_UNICAST_HOPS:
1018 case IPV6_MULTICAST_HOPS:
1019 {
1020 struct dst_entry *dst;
1021
1022 if (optname == IPV6_UNICAST_HOPS)
1023 val = np->hop_limit;
1024 else
1025 val = np->mcast_hops;
1026
1027 dst = sk_dst_get(sk);
1028 if (dst) {
1029 if (val < 0)
1030 val = ip6_dst_hoplimit(dst);
1031 dst_release(dst);
1032 }
1033 if (val < 0)
1034 val = ipv6_devconf.hop_limit;
1035 break;
1036 }
1037
1038 case IPV6_MULTICAST_LOOP:
1039 val = np->mc_loop;
1040 break;
1041
1042 case IPV6_MULTICAST_IF:
1043 val = np->mcast_oif;
1044 break;
1045
1046 case IPV6_MTU_DISCOVER:
1047 val = np->pmtudisc;
1048 break;
1049
1050 case IPV6_RECVERR:
1051 val = np->recverr;
1052 break;
1053
1054 case IPV6_FLOWINFO_SEND:
1055 val = np->sndflow;
1056 break;
1057
1058 case IPV6_ADDR_PREFERENCES:
1059 val = 0;
1060
1061 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1062 val |= IPV6_PREFER_SRC_TMP;
1063 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1064 val |= IPV6_PREFER_SRC_PUBLIC;
1065 else {
1066 /* XXX: should we return system default? */
1067 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1068 }
1069
1070 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1071 val |= IPV6_PREFER_SRC_COA;
1072 else
1073 val |= IPV6_PREFER_SRC_HOME;
1074 break;
1075
1076 default:
1077 return -ENOPROTOOPT;
1078 }
1079 len = min_t(unsigned int, sizeof(int), len);
1080 if(put_user(len, optlen))
1081 return -EFAULT;
1082 if(copy_to_user(optval,&val,len))
1083 return -EFAULT;
1084 return 0;
1085 }
1086
1087 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1088 char __user *optval, int __user *optlen)
1089 {
1090 int err;
1091
1092 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1093 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1094
1095 if(level != SOL_IPV6)
1096 return -ENOPROTOOPT;
1097
1098 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1099 #ifdef CONFIG_NETFILTER
1100 /* we need to exclude all possible ENOPROTOOPTs except default case */
1101 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1102 int len;
1103
1104 if (get_user(len, optlen))
1105 return -EFAULT;
1106
1107 lock_sock(sk);
1108 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1109 &len);
1110 release_sock(sk);
1111 if (err >= 0)
1112 err = put_user(len, optlen);
1113 }
1114 #endif
1115 return err;
1116 }
1117
1118 EXPORT_SYMBOL(ipv6_getsockopt);
1119
1120 #ifdef CONFIG_COMPAT
1121 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1122 char __user *optval, int __user *optlen)
1123 {
1124 int err;
1125
1126 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1127 if (udp_prot.compat_getsockopt != NULL)
1128 return udp_prot.compat_getsockopt(sk, level, optname,
1129 optval, optlen);
1130 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1131 }
1132
1133 if (level != SOL_IPV6)
1134 return -ENOPROTOOPT;
1135
1136 if (optname == MCAST_MSFILTER)
1137 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1138 ipv6_getsockopt);
1139
1140 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1141 #ifdef CONFIG_NETFILTER
1142 /* we need to exclude all possible ENOPROTOOPTs except default case */
1143 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1144 int len;
1145
1146 if (get_user(len, optlen))
1147 return -EFAULT;
1148
1149 lock_sock(sk);
1150 err = compat_nf_getsockopt(sk, PF_INET6,
1151 optname, optval, &len);
1152 release_sock(sk);
1153 if (err >= 0)
1154 err = put_user(len, optlen);
1155 }
1156 #endif
1157 return err;
1158 }
1159
1160 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1161 #endif
1162
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