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Merge branch 'fix/asoc' into for-linus
[firewire-audio.git] / net / ipv6 / ipv6_sockglue.c
blob430454ee5ead4413de26d5607606d86ad11ecd94
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 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * FIXME: Make the setsockopt code POSIX compliant: That is
16 *
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
19 *
20 * Changes:
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
23 */
24
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/mroute6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
39
40 #include <net/sock.h>
41 #include <net/snmp.h>
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
49 #include <net/tcp.h>
50 #include <net/udp.h>
51 #include <net/udplite.h>
52 #include <net/xfrm.h>
53 #include <net/compat.h>
54
55 #include <asm/uaccess.h>
56
57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
58
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
61
62 int ip6_ra_control(struct sock *sk, int sel)
63 {
64 struct ip6_ra_chain *ra, *new_ra, **rap;
65
66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
68 return -ENOPROTOOPT;
69
70 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel>=0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (new_ra == NULL) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
102 static
103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
104 struct ipv6_txoptions *opt)
105 {
106 if (inet_sk(sk)->is_icsk) {
107 if (opt &&
108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
109 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
110 struct inet_connection_sock *icsk = inet_csk(sk);
111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
113 }
114 opt = xchg(&inet6_sk(sk)->opt, opt);
115 } else {
116 write_lock(&sk->sk_dst_lock);
117 opt = xchg(&inet6_sk(sk)->opt, opt);
118 write_unlock(&sk->sk_dst_lock);
119 }
120 sk_dst_reset(sk);
121
122 return opt;
123 }
124
125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
126 char __user *optval, unsigned int optlen)
127 {
128 struct ipv6_pinfo *np = inet6_sk(sk);
129 struct net *net = sock_net(sk);
130 int val, valbool;
131 int retv = -ENOPROTOOPT;
132
133 if (optval == NULL)
134 val=0;
135 else {
136 if (optlen >= sizeof(int)) {
137 if (get_user(val, (int __user *) optval))
138 return -EFAULT;
139 } else
140 val = 0;
141 }
142
143 valbool = (val!=0);
144
145 if (ip6_mroute_opt(optname))
146 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
147
148 lock_sock(sk);
149
150 switch (optname) {
151
152 case IPV6_ADDRFORM:
153 if (optlen < sizeof(int))
154 goto e_inval;
155 if (val == PF_INET) {
156 struct ipv6_txoptions *opt;
157 struct sk_buff *pktopt;
158
159 if (sk->sk_type == SOCK_RAW)
160 break;
161
162 if (sk->sk_protocol == IPPROTO_UDP ||
163 sk->sk_protocol == IPPROTO_UDPLITE) {
164 struct udp_sock *up = udp_sk(sk);
165 if (up->pending == AF_INET6) {
166 retv = -EBUSY;
167 break;
168 }
169 } else if (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 kfree_skb(pktopt);
222
223 sk->sk_destruct = inet_sock_destruct;
224 /*
225 * ... and add it to the refcnt debug socks count
226 * in the new family. -acme
227 */
228 sk_refcnt_debug_inc(sk);
229 module_put(THIS_MODULE);
230 retv = 0;
231 break;
232 }
233 goto e_inval;
234
235 case IPV6_V6ONLY:
236 if (optlen < sizeof(int) ||
237 inet_sk(sk)->inet_num)
238 goto e_inval;
239 np->ipv6only = valbool;
240 retv = 0;
241 break;
242
243 case IPV6_RECVPKTINFO:
244 if (optlen < sizeof(int))
245 goto e_inval;
246 np->rxopt.bits.rxinfo = valbool;
247 retv = 0;
248 break;
249
250 case IPV6_2292PKTINFO:
251 if (optlen < sizeof(int))
252 goto e_inval;
253 np->rxopt.bits.rxoinfo = valbool;
254 retv = 0;
255 break;
256
257 case IPV6_RECVHOPLIMIT:
258 if (optlen < sizeof(int))
259 goto e_inval;
260 np->rxopt.bits.rxhlim = valbool;
261 retv = 0;
262 break;
263
264 case IPV6_2292HOPLIMIT:
265 if (optlen < sizeof(int))
266 goto e_inval;
267 np->rxopt.bits.rxohlim = valbool;
268 retv = 0;
269 break;
270
271 case IPV6_RECVRTHDR:
272 if (optlen < sizeof(int))
273 goto e_inval;
274 np->rxopt.bits.srcrt = valbool;
275 retv = 0;
276 break;
277
278 case IPV6_2292RTHDR:
279 if (optlen < sizeof(int))
280 goto e_inval;
281 np->rxopt.bits.osrcrt = valbool;
282 retv = 0;
283 break;
284
285 case IPV6_RECVHOPOPTS:
286 if (optlen < sizeof(int))
287 goto e_inval;
288 np->rxopt.bits.hopopts = valbool;
289 retv = 0;
290 break;
291
292 case IPV6_2292HOPOPTS:
293 if (optlen < sizeof(int))
294 goto e_inval;
295 np->rxopt.bits.ohopopts = valbool;
296 retv = 0;
297 break;
298
299 case IPV6_RECVDSTOPTS:
300 if (optlen < sizeof(int))
301 goto e_inval;
302 np->rxopt.bits.dstopts = valbool;
303 retv = 0;
304 break;
305
306 case IPV6_2292DSTOPTS:
307 if (optlen < sizeof(int))
308 goto e_inval;
309 np->rxopt.bits.odstopts = valbool;
310 retv = 0;
311 break;
312
313 case IPV6_TCLASS:
314 if (optlen < sizeof(int))
315 goto e_inval;
316 if (val < -1 || val > 0xff)
317 goto e_inval;
318 /* RFC 3542, 6.5: default traffic class of 0x0 */
319 if (val == -1)
320 val = 0;
321 np->tclass = val;
322 retv = 0;
323 break;
324
325 case IPV6_RECVTCLASS:
326 if (optlen < sizeof(int))
327 goto e_inval;
328 np->rxopt.bits.rxtclass = valbool;
329 retv = 0;
330 break;
331
332 case IPV6_FLOWINFO:
333 if (optlen < sizeof(int))
334 goto e_inval;
335 np->rxopt.bits.rxflow = valbool;
336 retv = 0;
337 break;
338
339 case IPV6_HOPOPTS:
340 case IPV6_RTHDRDSTOPTS:
341 case IPV6_RTHDR:
342 case IPV6_DSTOPTS:
343 {
344 struct ipv6_txoptions *opt;
345
346 /* remove any sticky options header with a zero option
347 * length, per RFC3542.
348 */
349 if (optlen == 0)
350 optval = NULL;
351 else if (optval == NULL)
352 goto e_inval;
353 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
354 optlen & 0x7 || optlen > 8 * 255)
355 goto e_inval;
356
357 /* hop-by-hop / destination options are privileged option */
358 retv = -EPERM;
359 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
360 break;
361
362 opt = ipv6_renew_options(sk, np->opt, optname,
363 (struct ipv6_opt_hdr __user *)optval,
364 optlen);
365 if (IS_ERR(opt)) {
366 retv = PTR_ERR(opt);
367 break;
368 }
369
370 /* routing header option needs extra check */
371 retv = -EINVAL;
372 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
373 struct ipv6_rt_hdr *rthdr = opt->srcrt;
374 switch (rthdr->type) {
375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
376 case IPV6_SRCRT_TYPE_2:
377 if (rthdr->hdrlen != 2 ||
378 rthdr->segments_left != 1)
379 goto sticky_done;
380
381 break;
382 #endif
383 default:
384 goto sticky_done;
385 }
386 }
387
388 retv = 0;
389 opt = ipv6_update_options(sk, opt);
390 sticky_done:
391 if (opt)
392 sock_kfree_s(sk, opt, opt->tot_len);
393 break;
394 }
395
396 case IPV6_PKTINFO:
397 {
398 struct in6_pktinfo pkt;
399
400 if (optlen == 0)
401 goto e_inval;
402 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
403 goto e_inval;
404
405 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
406 retv = -EFAULT;
407 break;
408 }
409 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
410 goto e_inval;
411
412 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
413 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
414 retv = 0;
415 break;
416 }
417
418 case IPV6_2292PKTOPTIONS:
419 {
420 struct ipv6_txoptions *opt = NULL;
421 struct msghdr msg;
422 struct flowi fl;
423 int junk;
424
425 fl.fl6_flowlabel = 0;
426 fl.oif = sk->sk_bound_dev_if;
427 fl.mark = sk->sk_mark;
428
429 if (optlen == 0)
430 goto update;
431
432 /* 1K is probably excessive
433 * 1K is surely not enough, 2K per standard header is 16K.
434 */
435 retv = -EINVAL;
436 if (optlen > 64*1024)
437 break;
438
439 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
440 retv = -ENOBUFS;
441 if (opt == NULL)
442 break;
443
444 memset(opt, 0, sizeof(*opt));
445 opt->tot_len = sizeof(*opt) + optlen;
446 retv = -EFAULT;
447 if (copy_from_user(opt+1, optval, optlen))
448 goto done;
449
450 msg.msg_controllen = optlen;
451 msg.msg_control = (void*)(opt+1);
452
453 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
454 if (retv)
455 goto done;
456 update:
457 retv = 0;
458 opt = ipv6_update_options(sk, opt);
459 done:
460 if (opt)
461 sock_kfree_s(sk, opt, opt->tot_len);
462 break;
463 }
464 case IPV6_UNICAST_HOPS:
465 if (optlen < sizeof(int))
466 goto e_inval;
467 if (val > 255 || val < -1)
468 goto e_inval;
469 np->hop_limit = val;
470 retv = 0;
471 break;
472
473 case IPV6_MULTICAST_HOPS:
474 if (sk->sk_type == SOCK_STREAM)
475 break;
476 if (optlen < sizeof(int))
477 goto e_inval;
478 if (val > 255 || val < -1)
479 goto e_inval;
480 np->mcast_hops = val;
481 retv = 0;
482 break;
483
484 case IPV6_MULTICAST_LOOP:
485 if (optlen < sizeof(int))
486 goto e_inval;
487 if (val != valbool)
488 goto e_inval;
489 np->mc_loop = valbool;
490 retv = 0;
491 break;
492
493 case IPV6_MULTICAST_IF:
494 if (sk->sk_type == SOCK_STREAM)
495 break;
496 if (optlen < sizeof(int))
497 goto e_inval;
498
499 if (val) {
500 struct net_device *dev;
501
502 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
503 goto e_inval;
504
505 dev = dev_get_by_index(net, val);
506 if (!dev) {
507 retv = -ENODEV;
508 break;
509 }
510 dev_put(dev);
511 }
512 np->mcast_oif = val;
513 retv = 0;
514 break;
515 case IPV6_ADD_MEMBERSHIP:
516 case IPV6_DROP_MEMBERSHIP:
517 {
518 struct ipv6_mreq mreq;
519
520 if (optlen < sizeof(struct ipv6_mreq))
521 goto e_inval;
522
523 retv = -EPROTO;
524 if (inet_sk(sk)->is_icsk)
525 break;
526
527 retv = -EFAULT;
528 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
529 break;
530
531 if (optname == IPV6_ADD_MEMBERSHIP)
532 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
533 else
534 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
535 break;
536 }
537 case IPV6_JOIN_ANYCAST:
538 case IPV6_LEAVE_ANYCAST:
539 {
540 struct ipv6_mreq mreq;
541
542 if (optlen < sizeof(struct ipv6_mreq))
543 goto e_inval;
544
545 retv = -EFAULT;
546 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
547 break;
548
549 if (optname == IPV6_JOIN_ANYCAST)
550 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
551 else
552 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
553 break;
554 }
555 case MCAST_JOIN_GROUP:
556 case MCAST_LEAVE_GROUP:
557 {
558 struct group_req greq;
559 struct sockaddr_in6 *psin6;
560
561 if (optlen < sizeof(struct group_req))
562 goto e_inval;
563
564 retv = -EFAULT;
565 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
566 break;
567 if (greq.gr_group.ss_family != AF_INET6) {
568 retv = -EADDRNOTAVAIL;
569 break;
570 }
571 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
572 if (optname == MCAST_JOIN_GROUP)
573 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
574 &psin6->sin6_addr);
575 else
576 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
577 &psin6->sin6_addr);
578 break;
579 }
580 case MCAST_JOIN_SOURCE_GROUP:
581 case MCAST_LEAVE_SOURCE_GROUP:
582 case MCAST_BLOCK_SOURCE:
583 case MCAST_UNBLOCK_SOURCE:
584 {
585 struct group_source_req greqs;
586 int omode, add;
587
588 if (optlen < sizeof(struct group_source_req))
589 goto e_inval;
590 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
591 retv = -EFAULT;
592 break;
593 }
594 if (greqs.gsr_group.ss_family != AF_INET6 ||
595 greqs.gsr_source.ss_family != AF_INET6) {
596 retv = -EADDRNOTAVAIL;
597 break;
598 }
599 if (optname == MCAST_BLOCK_SOURCE) {
600 omode = MCAST_EXCLUDE;
601 add = 1;
602 } else if (optname == MCAST_UNBLOCK_SOURCE) {
603 omode = MCAST_EXCLUDE;
604 add = 0;
605 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
606 struct sockaddr_in6 *psin6;
607
608 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
609 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
610 &psin6->sin6_addr);
611 /* prior join w/ different source is ok */
612 if (retv && retv != -EADDRINUSE)
613 break;
614 omode = MCAST_INCLUDE;
615 add = 1;
616 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
617 omode = MCAST_INCLUDE;
618 add = 0;
619 }
620 retv = ip6_mc_source(add, omode, sk, &greqs);
621 break;
622 }
623 case MCAST_MSFILTER:
624 {
625 extern int sysctl_mld_max_msf;
626 struct group_filter *gsf;
627
628 if (optlen < GROUP_FILTER_SIZE(0))
629 goto e_inval;
630 if (optlen > sysctl_optmem_max) {
631 retv = -ENOBUFS;
632 break;
633 }
634 gsf = kmalloc(optlen,GFP_KERNEL);
635 if (!gsf) {
636 retv = -ENOBUFS;
637 break;
638 }
639 retv = -EFAULT;
640 if (copy_from_user(gsf, optval, optlen)) {
641 kfree(gsf);
642 break;
643 }
644 /* numsrc >= (4G-140)/128 overflow in 32 bits */
645 if (gsf->gf_numsrc >= 0x1ffffffU ||
646 gsf->gf_numsrc > sysctl_mld_max_msf) {
647 kfree(gsf);
648 retv = -ENOBUFS;
649 break;
650 }
651 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
652 kfree(gsf);
653 retv = -EINVAL;
654 break;
655 }
656 retv = ip6_mc_msfilter(sk, gsf);
657 kfree(gsf);
658
659 break;
660 }
661 case IPV6_ROUTER_ALERT:
662 if (optlen < sizeof(int))
663 goto e_inval;
664 retv = ip6_ra_control(sk, val);
665 break;
666 case IPV6_MTU_DISCOVER:
667 if (optlen < sizeof(int))
668 goto e_inval;
669 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
670 goto e_inval;
671 np->pmtudisc = val;
672 retv = 0;
673 break;
674 case IPV6_MTU:
675 if (optlen < sizeof(int))
676 goto e_inval;
677 if (val && val < IPV6_MIN_MTU)
678 goto e_inval;
679 np->frag_size = val;
680 retv = 0;
681 break;
682 case IPV6_RECVERR:
683 if (optlen < sizeof(int))
684 goto e_inval;
685 np->recverr = valbool;
686 if (!val)
687 skb_queue_purge(&sk->sk_error_queue);
688 retv = 0;
689 break;
690 case IPV6_FLOWINFO_SEND:
691 if (optlen < sizeof(int))
692 goto e_inval;
693 np->sndflow = valbool;
694 retv = 0;
695 break;
696 case IPV6_FLOWLABEL_MGR:
697 retv = ipv6_flowlabel_opt(sk, optval, optlen);
698 break;
699 case IPV6_IPSEC_POLICY:
700 case IPV6_XFRM_POLICY:
701 retv = -EPERM;
702 if (!capable(CAP_NET_ADMIN))
703 break;
704 retv = xfrm_user_policy(sk, optname, optval, optlen);
705 break;
706
707 case IPV6_ADDR_PREFERENCES:
708 {
709 unsigned int pref = 0;
710 unsigned int prefmask = ~0;
711
712 if (optlen < sizeof(int))
713 goto e_inval;
714
715 retv = -EINVAL;
716
717 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
718 switch (val & (IPV6_PREFER_SRC_PUBLIC|
719 IPV6_PREFER_SRC_TMP|
720 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
721 case IPV6_PREFER_SRC_PUBLIC:
722 pref |= IPV6_PREFER_SRC_PUBLIC;
723 break;
724 case IPV6_PREFER_SRC_TMP:
725 pref |= IPV6_PREFER_SRC_TMP;
726 break;
727 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
728 break;
729 case 0:
730 goto pref_skip_pubtmp;
731 default:
732 goto e_inval;
733 }
734
735 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
736 IPV6_PREFER_SRC_TMP);
737 pref_skip_pubtmp:
738
739 /* check HOME/COA conflicts */
740 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
741 case IPV6_PREFER_SRC_HOME:
742 break;
743 case IPV6_PREFER_SRC_COA:
744 pref |= IPV6_PREFER_SRC_COA;
745 case 0:
746 goto pref_skip_coa;
747 default:
748 goto e_inval;
749 }
750
751 prefmask &= ~IPV6_PREFER_SRC_COA;
752 pref_skip_coa:
753
754 /* check CGA/NONCGA conflicts */
755 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
756 case IPV6_PREFER_SRC_CGA:
757 case IPV6_PREFER_SRC_NONCGA:
758 case 0:
759 break;
760 default:
761 goto e_inval;
762 }
763
764 np->srcprefs = (np->srcprefs & prefmask) | pref;
765 retv = 0;
766
767 break;
768 }
769 }
770
771 release_sock(sk);
772
773 return retv;
774
775 e_inval:
776 release_sock(sk);
777 return -EINVAL;
778 }
779
780 int ipv6_setsockopt(struct sock *sk, int level, int optname,
781 char __user *optval, unsigned int optlen)
782 {
783 int err;
784
785 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
786 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
787
788 if (level != SOL_IPV6)
789 return -ENOPROTOOPT;
790
791 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
792 #ifdef CONFIG_NETFILTER
793 /* we need to exclude all possible ENOPROTOOPTs except default case */
794 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
795 optname != IPV6_XFRM_POLICY) {
796 lock_sock(sk);
797 err = nf_setsockopt(sk, PF_INET6, optname, optval,
798 optlen);
799 release_sock(sk);
800 }
801 #endif
802 return err;
803 }
804
805 EXPORT_SYMBOL(ipv6_setsockopt);
806
807 #ifdef CONFIG_COMPAT
808 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
809 char __user *optval, unsigned int optlen)
810 {
811 int err;
812
813 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
814 if (udp_prot.compat_setsockopt != NULL)
815 return udp_prot.compat_setsockopt(sk, level, optname,
816 optval, optlen);
817 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
818 }
819
820 if (level != SOL_IPV6)
821 return -ENOPROTOOPT;
822
823 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
824 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
825 ipv6_setsockopt);
826
827 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
828 #ifdef CONFIG_NETFILTER
829 /* we need to exclude all possible ENOPROTOOPTs except default case */
830 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
831 optname != IPV6_XFRM_POLICY) {
832 lock_sock(sk);
833 err = compat_nf_setsockopt(sk, PF_INET6, optname,
834 optval, optlen);
835 release_sock(sk);
836 }
837 #endif
838 return err;
839 }
840
841 EXPORT_SYMBOL(compat_ipv6_setsockopt);
842 #endif
843
844 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
845 int optname, char __user *optval, int len)
846 {
847 struct ipv6_opt_hdr *hdr;
848
849 if (!opt)
850 return 0;
851
852 switch(optname) {
853 case IPV6_HOPOPTS:
854 hdr = opt->hopopt;
855 break;
856 case IPV6_RTHDRDSTOPTS:
857 hdr = opt->dst0opt;
858 break;
859 case IPV6_RTHDR:
860 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
861 break;
862 case IPV6_DSTOPTS:
863 hdr = opt->dst1opt;
864 break;
865 default:
866 return -EINVAL; /* should not happen */
867 }
868
869 if (!hdr)
870 return 0;
871
872 len = min_t(unsigned int, len, ipv6_optlen(hdr));
873 if (copy_to_user(optval, hdr, len))
874 return -EFAULT;
875 return len;
876 }
877
878 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
879 char __user *optval, int __user *optlen)
880 {
881 struct ipv6_pinfo *np = inet6_sk(sk);
882 int len;
883 int val;
884
885 if (ip6_mroute_opt(optname))
886 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
887
888 if (get_user(len, optlen))
889 return -EFAULT;
890 switch (optname) {
891 case IPV6_ADDRFORM:
892 if (sk->sk_protocol != IPPROTO_UDP &&
893 sk->sk_protocol != IPPROTO_UDPLITE &&
894 sk->sk_protocol != IPPROTO_TCP)
895 return -ENOPROTOOPT;
896 if (sk->sk_state != TCP_ESTABLISHED)
897 return -ENOTCONN;
898 val = sk->sk_family;
899 break;
900 case MCAST_MSFILTER:
901 {
902 struct group_filter gsf;
903 int err;
904
905 if (len < GROUP_FILTER_SIZE(0))
906 return -EINVAL;
907 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
908 return -EFAULT;
909 if (gsf.gf_group.ss_family != AF_INET6)
910 return -EADDRNOTAVAIL;
911 lock_sock(sk);
912 err = ip6_mc_msfget(sk, &gsf,
913 (struct group_filter __user *)optval, optlen);
914 release_sock(sk);
915 return err;
916 }
917
918 case IPV6_2292PKTOPTIONS:
919 {
920 struct msghdr msg;
921 struct sk_buff *skb;
922
923 if (sk->sk_type != SOCK_STREAM)
924 return -ENOPROTOOPT;
925
926 msg.msg_control = optval;
927 msg.msg_controllen = len;
928 msg.msg_flags = 0;
929
930 lock_sock(sk);
931 skb = np->pktoptions;
932 if (skb)
933 atomic_inc(&skb->users);
934 release_sock(sk);
935
936 if (skb) {
937 int err = datagram_recv_ctl(sk, &msg, skb);
938 kfree_skb(skb);
939 if (err)
940 return err;
941 } else {
942 if (np->rxopt.bits.rxinfo) {
943 struct in6_pktinfo src_info;
944 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
945 np->sticky_pktinfo.ipi6_ifindex;
946 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
947 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
948 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
949 }
950 if (np->rxopt.bits.rxhlim) {
951 int hlim = np->mcast_hops;
952 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
953 }
954 if (np->rxopt.bits.rxoinfo) {
955 struct in6_pktinfo src_info;
956 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
957 np->sticky_pktinfo.ipi6_ifindex;
958 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
959 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
960 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
961 }
962 if (np->rxopt.bits.rxohlim) {
963 int hlim = np->mcast_hops;
964 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
965 }
966 }
967 len -= msg.msg_controllen;
968 return put_user(len, optlen);
969 }
970 case IPV6_MTU:
971 {
972 struct dst_entry *dst;
973 val = 0;
974 lock_sock(sk);
975 dst = sk_dst_get(sk);
976 if (dst) {
977 val = dst_mtu(dst);
978 dst_release(dst);
979 }
980 release_sock(sk);
981 if (!val)
982 return -ENOTCONN;
983 break;
984 }
985
986 case IPV6_V6ONLY:
987 val = np->ipv6only;
988 break;
989
990 case IPV6_RECVPKTINFO:
991 val = np->rxopt.bits.rxinfo;
992 break;
993
994 case IPV6_2292PKTINFO:
995 val = np->rxopt.bits.rxoinfo;
996 break;
997
998 case IPV6_RECVHOPLIMIT:
999 val = np->rxopt.bits.rxhlim;
1000 break;
1001
1002 case IPV6_2292HOPLIMIT:
1003 val = np->rxopt.bits.rxohlim;
1004 break;
1005
1006 case IPV6_RECVRTHDR:
1007 val = np->rxopt.bits.srcrt;
1008 break;
1009
1010 case IPV6_2292RTHDR:
1011 val = np->rxopt.bits.osrcrt;
1012 break;
1013
1014 case IPV6_HOPOPTS:
1015 case IPV6_RTHDRDSTOPTS:
1016 case IPV6_RTHDR:
1017 case IPV6_DSTOPTS:
1018 {
1019
1020 lock_sock(sk);
1021 len = ipv6_getsockopt_sticky(sk, np->opt,
1022 optname, optval, len);
1023 release_sock(sk);
1024 /* check if ipv6_getsockopt_sticky() returns err code */
1025 if (len < 0)
1026 return len;
1027 return put_user(len, optlen);
1028 }
1029
1030 case IPV6_RECVHOPOPTS:
1031 val = np->rxopt.bits.hopopts;
1032 break;
1033
1034 case IPV6_2292HOPOPTS:
1035 val = np->rxopt.bits.ohopopts;
1036 break;
1037
1038 case IPV6_RECVDSTOPTS:
1039 val = np->rxopt.bits.dstopts;
1040 break;
1041
1042 case IPV6_2292DSTOPTS:
1043 val = np->rxopt.bits.odstopts;
1044 break;
1045
1046 case IPV6_TCLASS:
1047 val = np->tclass;
1048 break;
1049
1050 case IPV6_RECVTCLASS:
1051 val = np->rxopt.bits.rxtclass;
1052 break;
1053
1054 case IPV6_FLOWINFO:
1055 val = np->rxopt.bits.rxflow;
1056 break;
1057
1058 case IPV6_UNICAST_HOPS:
1059 case IPV6_MULTICAST_HOPS:
1060 {
1061 struct dst_entry *dst;
1062
1063 if (optname == IPV6_UNICAST_HOPS)
1064 val = np->hop_limit;
1065 else
1066 val = np->mcast_hops;
1067
1068 dst = sk_dst_get(sk);
1069 if (dst) {
1070 if (val < 0)
1071 val = ip6_dst_hoplimit(dst);
1072 dst_release(dst);
1073 }
1074 if (val < 0)
1075 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1076 break;
1077 }
1078
1079 case IPV6_MULTICAST_LOOP:
1080 val = np->mc_loop;
1081 break;
1082
1083 case IPV6_MULTICAST_IF:
1084 val = np->mcast_oif;
1085 break;
1086
1087 case IPV6_MTU_DISCOVER:
1088 val = np->pmtudisc;
1089 break;
1090
1091 case IPV6_RECVERR:
1092 val = np->recverr;
1093 break;
1094
1095 case IPV6_FLOWINFO_SEND:
1096 val = np->sndflow;
1097 break;
1098
1099 case IPV6_ADDR_PREFERENCES:
1100 val = 0;
1101
1102 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1103 val |= IPV6_PREFER_SRC_TMP;
1104 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1105 val |= IPV6_PREFER_SRC_PUBLIC;
1106 else {
1107 /* XXX: should we return system default? */
1108 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1109 }
1110
1111 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1112 val |= IPV6_PREFER_SRC_COA;
1113 else
1114 val |= IPV6_PREFER_SRC_HOME;
1115 break;
1116
1117 default:
1118 return -ENOPROTOOPT;
1119 }
1120 len = min_t(unsigned int, sizeof(int), len);
1121 if(put_user(len, optlen))
1122 return -EFAULT;
1123 if(copy_to_user(optval,&val,len))
1124 return -EFAULT;
1125 return 0;
1126 }
1127
1128 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1129 char __user *optval, int __user *optlen)
1130 {
1131 int err;
1132
1133 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1134 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1135
1136 if(level != SOL_IPV6)
1137 return -ENOPROTOOPT;
1138
1139 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1140 #ifdef CONFIG_NETFILTER
1141 /* we need to exclude all possible ENOPROTOOPTs except default case */
1142 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1143 int len;
1144
1145 if (get_user(len, optlen))
1146 return -EFAULT;
1147
1148 lock_sock(sk);
1149 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1150 &len);
1151 release_sock(sk);
1152 if (err >= 0)
1153 err = put_user(len, optlen);
1154 }
1155 #endif
1156 return err;
1157 }
1158
1159 EXPORT_SYMBOL(ipv6_getsockopt);
1160
1161 #ifdef CONFIG_COMPAT
1162 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1163 char __user *optval, int __user *optlen)
1164 {
1165 int err;
1166
1167 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1168 if (udp_prot.compat_getsockopt != NULL)
1169 return udp_prot.compat_getsockopt(sk, level, optname,
1170 optval, optlen);
1171 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1172 }
1173
1174 if (level != SOL_IPV6)
1175 return -ENOPROTOOPT;
1176
1177 if (optname == MCAST_MSFILTER)
1178 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1179 ipv6_getsockopt);
1180
1181 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1182 #ifdef CONFIG_NETFILTER
1183 /* we need to exclude all possible ENOPROTOOPTs except default case */
1184 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1185 int len;
1186
1187 if (get_user(len, optlen))
1188 return -EFAULT;
1189
1190 lock_sock(sk);
1191 err = compat_nf_getsockopt(sk, PF_INET6,
1192 optname, optval, &len);
1193 release_sock(sk);
1194 if (err >= 0)
1195 err = put_user(len, optlen);
1196 }
1197 #endif
1198 return err;
1199 }
1200
1201 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1202 #endif
1203
AMDTP streaming driver for the Linux FireWire stack (Juju)