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conn rcv_lock converted to spinlock, struct cor_sock created, kernel_packet skb_clone...
[cor_2_6_31.git] / net / ipv6 / ipv6_sockglue.c
bloba7fdf9a27f15e4b16cf36cb714f58e238921f451
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)->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)->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, 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)->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 np->tclass = val;
319 retv = 0;
320 break;
321
322 case IPV6_RECVTCLASS:
323 if (optlen < sizeof(int))
324 goto e_inval;
325 np->rxopt.bits.rxtclass = valbool;
326 retv = 0;
327 break;
328
329 case IPV6_FLOWINFO:
330 if (optlen < sizeof(int))
331 goto e_inval;
332 np->rxopt.bits.rxflow = valbool;
333 retv = 0;
334 break;
335
336 case IPV6_HOPOPTS:
337 case IPV6_RTHDRDSTOPTS:
338 case IPV6_RTHDR:
339 case IPV6_DSTOPTS:
340 {
341 struct ipv6_txoptions *opt;
342
343 /* remove any sticky options header with a zero option
344 * length, per RFC3542.
345 */
346 if (optlen == 0)
347 optval = NULL;
348 else if (optval == NULL)
349 goto e_inval;
350 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
351 optlen & 0x7 || optlen > 8 * 255)
352 goto e_inval;
353
354 /* hop-by-hop / destination options are privileged option */
355 retv = -EPERM;
356 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
357 break;
358
359 opt = ipv6_renew_options(sk, np->opt, optname,
360 (struct ipv6_opt_hdr __user *)optval,
361 optlen);
362 if (IS_ERR(opt)) {
363 retv = PTR_ERR(opt);
364 break;
365 }
366
367 /* routing header option needs extra check */
368 retv = -EINVAL;
369 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
370 struct ipv6_rt_hdr *rthdr = opt->srcrt;
371 switch (rthdr->type) {
372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
373 case IPV6_SRCRT_TYPE_2:
374 if (rthdr->hdrlen != 2 ||
375 rthdr->segments_left != 1)
376 goto sticky_done;
377
378 break;
379 #endif
380 default:
381 goto sticky_done;
382 }
383 }
384
385 retv = 0;
386 opt = ipv6_update_options(sk, opt);
387 sticky_done:
388 if (opt)
389 sock_kfree_s(sk, opt, opt->tot_len);
390 break;
391 }
392
393 case IPV6_PKTINFO:
394 {
395 struct in6_pktinfo pkt;
396
397 if (optlen == 0)
398 goto e_inval;
399 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
400 goto e_inval;
401
402 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
403 retv = -EFAULT;
404 break;
405 }
406 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
407 goto e_inval;
408
409 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
410 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
411 retv = 0;
412 break;
413 }
414
415 case IPV6_2292PKTOPTIONS:
416 {
417 struct ipv6_txoptions *opt = NULL;
418 struct msghdr msg;
419 struct flowi fl;
420 int junk;
421
422 fl.fl6_flowlabel = 0;
423 fl.oif = sk->sk_bound_dev_if;
424
425 if (optlen == 0)
426 goto update;
427
428 /* 1K is probably excessive
429 * 1K is surely not enough, 2K per standard header is 16K.
430 */
431 retv = -EINVAL;
432 if (optlen > 64*1024)
433 break;
434
435 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
436 retv = -ENOBUFS;
437 if (opt == NULL)
438 break;
439
440 memset(opt, 0, sizeof(*opt));
441 opt->tot_len = sizeof(*opt) + optlen;
442 retv = -EFAULT;
443 if (copy_from_user(opt+1, optval, optlen))
444 goto done;
445
446 msg.msg_controllen = optlen;
447 msg.msg_control = (void*)(opt+1);
448
449 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
450 if (retv)
451 goto done;
452 update:
453 retv = 0;
454 opt = ipv6_update_options(sk, opt);
455 done:
456 if (opt)
457 sock_kfree_s(sk, opt, opt->tot_len);
458 break;
459 }
460 case IPV6_UNICAST_HOPS:
461 if (optlen < sizeof(int))
462 goto e_inval;
463 if (val > 255 || val < -1)
464 goto e_inval;
465 np->hop_limit = val;
466 retv = 0;
467 break;
468
469 case IPV6_MULTICAST_HOPS:
470 if (sk->sk_type == SOCK_STREAM)
471 break;
472 if (optlen < sizeof(int))
473 goto e_inval;
474 if (val > 255 || val < -1)
475 goto e_inval;
476 np->mcast_hops = val;
477 retv = 0;
478 break;
479
480 case IPV6_MULTICAST_LOOP:
481 if (optlen < sizeof(int))
482 goto e_inval;
483 if (val != valbool)
484 goto e_inval;
485 np->mc_loop = valbool;
486 retv = 0;
487 break;
488
489 case IPV6_MULTICAST_IF:
490 if (sk->sk_type == SOCK_STREAM)
491 break;
492 if (optlen < sizeof(int))
493 goto e_inval;
494
495 if (val) {
496 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
497 goto e_inval;
498
499 if (__dev_get_by_index(net, val) == NULL) {
500 retv = -ENODEV;
501 break;
502 }
503 }
504 np->mcast_oif = val;
505 retv = 0;
506 break;
507 case IPV6_ADD_MEMBERSHIP:
508 case IPV6_DROP_MEMBERSHIP:
509 {
510 struct ipv6_mreq mreq;
511
512 if (optlen < sizeof(struct ipv6_mreq))
513 goto e_inval;
514
515 retv = -EPROTO;
516 if (inet_sk(sk)->is_icsk)
517 break;
518
519 retv = -EFAULT;
520 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
521 break;
522
523 if (optname == IPV6_ADD_MEMBERSHIP)
524 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
525 else
526 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
527 break;
528 }
529 case IPV6_JOIN_ANYCAST:
530 case IPV6_LEAVE_ANYCAST:
531 {
532 struct ipv6_mreq mreq;
533
534 if (optlen < sizeof(struct ipv6_mreq))
535 goto e_inval;
536
537 retv = -EFAULT;
538 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
539 break;
540
541 if (optname == IPV6_JOIN_ANYCAST)
542 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
543 else
544 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
545 break;
546 }
547 case MCAST_JOIN_GROUP:
548 case MCAST_LEAVE_GROUP:
549 {
550 struct group_req greq;
551 struct sockaddr_in6 *psin6;
552
553 if (optlen < sizeof(struct group_req))
554 goto e_inval;
555
556 retv = -EFAULT;
557 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
558 break;
559 if (greq.gr_group.ss_family != AF_INET6) {
560 retv = -EADDRNOTAVAIL;
561 break;
562 }
563 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
564 if (optname == MCAST_JOIN_GROUP)
565 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
566 &psin6->sin6_addr);
567 else
568 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
569 &psin6->sin6_addr);
570 break;
571 }
572 case MCAST_JOIN_SOURCE_GROUP:
573 case MCAST_LEAVE_SOURCE_GROUP:
574 case MCAST_BLOCK_SOURCE:
575 case MCAST_UNBLOCK_SOURCE:
576 {
577 struct group_source_req greqs;
578 int omode, add;
579
580 if (optlen < sizeof(struct group_source_req))
581 goto e_inval;
582 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
583 retv = -EFAULT;
584 break;
585 }
586 if (greqs.gsr_group.ss_family != AF_INET6 ||
587 greqs.gsr_source.ss_family != AF_INET6) {
588 retv = -EADDRNOTAVAIL;
589 break;
590 }
591 if (optname == MCAST_BLOCK_SOURCE) {
592 omode = MCAST_EXCLUDE;
593 add = 1;
594 } else if (optname == MCAST_UNBLOCK_SOURCE) {
595 omode = MCAST_EXCLUDE;
596 add = 0;
597 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
598 struct sockaddr_in6 *psin6;
599
600 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
601 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
602 &psin6->sin6_addr);
603 /* prior join w/ different source is ok */
604 if (retv && retv != -EADDRINUSE)
605 break;
606 omode = MCAST_INCLUDE;
607 add = 1;
608 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
609 omode = MCAST_INCLUDE;
610 add = 0;
611 }
612 retv = ip6_mc_source(add, omode, sk, &greqs);
613 break;
614 }
615 case MCAST_MSFILTER:
616 {
617 extern int sysctl_mld_max_msf;
618 struct group_filter *gsf;
619
620 if (optlen < GROUP_FILTER_SIZE(0))
621 goto e_inval;
622 if (optlen > sysctl_optmem_max) {
623 retv = -ENOBUFS;
624 break;
625 }
626 gsf = kmalloc(optlen,GFP_KERNEL);
627 if (!gsf) {
628 retv = -ENOBUFS;
629 break;
630 }
631 retv = -EFAULT;
632 if (copy_from_user(gsf, optval, optlen)) {
633 kfree(gsf);
634 break;
635 }
636 /* numsrc >= (4G-140)/128 overflow in 32 bits */
637 if (gsf->gf_numsrc >= 0x1ffffffU ||
638 gsf->gf_numsrc > sysctl_mld_max_msf) {
639 kfree(gsf);
640 retv = -ENOBUFS;
641 break;
642 }
643 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
644 kfree(gsf);
645 retv = -EINVAL;
646 break;
647 }
648 retv = ip6_mc_msfilter(sk, gsf);
649 kfree(gsf);
650
651 break;
652 }
653 case IPV6_ROUTER_ALERT:
654 if (optlen < sizeof(int))
655 goto e_inval;
656 retv = ip6_ra_control(sk, val);
657 break;
658 case IPV6_MTU_DISCOVER:
659 if (optlen < sizeof(int))
660 goto e_inval;
661 if (val<0 || val>3)
662 goto e_inval;
663 np->pmtudisc = val;
664 retv = 0;
665 break;
666 case IPV6_MTU:
667 if (optlen < sizeof(int))
668 goto e_inval;
669 if (val && val < IPV6_MIN_MTU)
670 goto e_inval;
671 np->frag_size = val;
672 retv = 0;
673 break;
674 case IPV6_RECVERR:
675 if (optlen < sizeof(int))
676 goto e_inval;
677 np->recverr = valbool;
678 if (!val)
679 skb_queue_purge(&sk->sk_error_queue);
680 retv = 0;
681 break;
682 case IPV6_FLOWINFO_SEND:
683 if (optlen < sizeof(int))
684 goto e_inval;
685 np->sndflow = valbool;
686 retv = 0;
687 break;
688 case IPV6_FLOWLABEL_MGR:
689 retv = ipv6_flowlabel_opt(sk, optval, optlen);
690 break;
691 case IPV6_IPSEC_POLICY:
692 case IPV6_XFRM_POLICY:
693 retv = -EPERM;
694 if (!capable(CAP_NET_ADMIN))
695 break;
696 retv = xfrm_user_policy(sk, optname, optval, optlen);
697 break;
698
699 case IPV6_ADDR_PREFERENCES:
700 {
701 unsigned int pref = 0;
702 unsigned int prefmask = ~0;
703
704 if (optlen < sizeof(int))
705 goto e_inval;
706
707 retv = -EINVAL;
708
709 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
710 switch (val & (IPV6_PREFER_SRC_PUBLIC|
711 IPV6_PREFER_SRC_TMP|
712 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
713 case IPV6_PREFER_SRC_PUBLIC:
714 pref |= IPV6_PREFER_SRC_PUBLIC;
715 break;
716 case IPV6_PREFER_SRC_TMP:
717 pref |= IPV6_PREFER_SRC_TMP;
718 break;
719 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
720 break;
721 case 0:
722 goto pref_skip_pubtmp;
723 default:
724 goto e_inval;
725 }
726
727 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
728 IPV6_PREFER_SRC_TMP);
729 pref_skip_pubtmp:
730
731 /* check HOME/COA conflicts */
732 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
733 case IPV6_PREFER_SRC_HOME:
734 break;
735 case IPV6_PREFER_SRC_COA:
736 pref |= IPV6_PREFER_SRC_COA;
737 case 0:
738 goto pref_skip_coa;
739 default:
740 goto e_inval;
741 }
742
743 prefmask &= ~IPV6_PREFER_SRC_COA;
744 pref_skip_coa:
745
746 /* check CGA/NONCGA conflicts */
747 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
748 case IPV6_PREFER_SRC_CGA:
749 case IPV6_PREFER_SRC_NONCGA:
750 case 0:
751 break;
752 default:
753 goto e_inval;
754 }
755
756 np->srcprefs = (np->srcprefs & prefmask) | pref;
757 retv = 0;
758
759 break;
760 }
761 }
762
763 release_sock(sk);
764
765 return retv;
766
767 e_inval:
768 release_sock(sk);
769 return -EINVAL;
770 }
771
772 int ipv6_setsockopt(struct sock *sk, int level, int optname,
773 char __user *optval, int optlen)
774 {
775 int err;
776
777 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
778 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
779
780 if (level != SOL_IPV6)
781 return -ENOPROTOOPT;
782
783 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
784 #ifdef CONFIG_NETFILTER
785 /* we need to exclude all possible ENOPROTOOPTs except default case */
786 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
787 optname != IPV6_XFRM_POLICY) {
788 lock_sock(sk);
789 err = nf_setsockopt(sk, PF_INET6, optname, optval,
790 optlen);
791 release_sock(sk);
792 }
793 #endif
794 return err;
795 }
796
797 EXPORT_SYMBOL(ipv6_setsockopt);
798
799 #ifdef CONFIG_COMPAT
800 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
801 char __user *optval, int optlen)
802 {
803 int err;
804
805 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
806 if (udp_prot.compat_setsockopt != NULL)
807 return udp_prot.compat_setsockopt(sk, level, optname,
808 optval, optlen);
809 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
810 }
811
812 if (level != SOL_IPV6)
813 return -ENOPROTOOPT;
814
815 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
816 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
817 ipv6_setsockopt);
818
819 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
820 #ifdef CONFIG_NETFILTER
821 /* we need to exclude all possible ENOPROTOOPTs except default case */
822 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
823 optname != IPV6_XFRM_POLICY) {
824 lock_sock(sk);
825 err = compat_nf_setsockopt(sk, PF_INET6, optname,
826 optval, optlen);
827 release_sock(sk);
828 }
829 #endif
830 return err;
831 }
832
833 EXPORT_SYMBOL(compat_ipv6_setsockopt);
834 #endif
835
836 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
837 int optname, char __user *optval, int len)
838 {
839 struct ipv6_opt_hdr *hdr;
840
841 if (!opt)
842 return 0;
843
844 switch(optname) {
845 case IPV6_HOPOPTS:
846 hdr = opt->hopopt;
847 break;
848 case IPV6_RTHDRDSTOPTS:
849 hdr = opt->dst0opt;
850 break;
851 case IPV6_RTHDR:
852 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
853 break;
854 case IPV6_DSTOPTS:
855 hdr = opt->dst1opt;
856 break;
857 default:
858 return -EINVAL; /* should not happen */
859 }
860
861 if (!hdr)
862 return 0;
863
864 len = min_t(unsigned int, len, ipv6_optlen(hdr));
865 if (copy_to_user(optval, hdr, len))
866 return -EFAULT;
867 return len;
868 }
869
870 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
871 char __user *optval, int __user *optlen)
872 {
873 struct ipv6_pinfo *np = inet6_sk(sk);
874 int len;
875 int val;
876
877 if (ip6_mroute_opt(optname))
878 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
879
880 if (get_user(len, optlen))
881 return -EFAULT;
882 switch (optname) {
883 case IPV6_ADDRFORM:
884 if (sk->sk_protocol != IPPROTO_UDP &&
885 sk->sk_protocol != IPPROTO_UDPLITE &&
886 sk->sk_protocol != IPPROTO_TCP)
887 return -ENOPROTOOPT;
888 if (sk->sk_state != TCP_ESTABLISHED)
889 return -ENOTCONN;
890 val = sk->sk_family;
891 break;
892 case MCAST_MSFILTER:
893 {
894 struct group_filter gsf;
895 int err;
896
897 if (len < GROUP_FILTER_SIZE(0))
898 return -EINVAL;
899 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
900 return -EFAULT;
901 if (gsf.gf_group.ss_family != AF_INET6)
902 return -EADDRNOTAVAIL;
903 lock_sock(sk);
904 err = ip6_mc_msfget(sk, &gsf,
905 (struct group_filter __user *)optval, optlen);
906 release_sock(sk);
907 return err;
908 }
909
910 case IPV6_2292PKTOPTIONS:
911 {
912 struct msghdr msg;
913 struct sk_buff *skb;
914
915 if (sk->sk_type != SOCK_STREAM)
916 return -ENOPROTOOPT;
917
918 msg.msg_control = optval;
919 msg.msg_controllen = len;
920 msg.msg_flags = 0;
921
922 lock_sock(sk);
923 skb = np->pktoptions;
924 if (skb)
925 atomic_inc(&skb->users);
926 release_sock(sk);
927
928 if (skb) {
929 int err = datagram_recv_ctl(sk, &msg, skb);
930 kfree_skb(skb);
931 if (err)
932 return err;
933 } else {
934 if (np->rxopt.bits.rxinfo) {
935 struct in6_pktinfo src_info;
936 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
937 np->sticky_pktinfo.ipi6_ifindex;
938 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
939 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
940 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
941 }
942 if (np->rxopt.bits.rxhlim) {
943 int hlim = np->mcast_hops;
944 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
945 }
946 if (np->rxopt.bits.rxoinfo) {
947 struct in6_pktinfo src_info;
948 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
949 np->sticky_pktinfo.ipi6_ifindex;
950 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
951 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
952 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
953 }
954 if (np->rxopt.bits.rxohlim) {
955 int hlim = np->mcast_hops;
956 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
957 }
958 }
959 len -= msg.msg_controllen;
960 return put_user(len, optlen);
961 }
962 case IPV6_MTU:
963 {
964 struct dst_entry *dst;
965 val = 0;
966 lock_sock(sk);
967 dst = sk_dst_get(sk);
968 if (dst) {
969 val = dst_mtu(dst);
970 dst_release(dst);
971 }
972 release_sock(sk);
973 if (!val)
974 return -ENOTCONN;
975 break;
976 }
977
978 case IPV6_V6ONLY:
979 val = np->ipv6only;
980 break;
981
982 case IPV6_RECVPKTINFO:
983 val = np->rxopt.bits.rxinfo;
984 break;
985
986 case IPV6_2292PKTINFO:
987 val = np->rxopt.bits.rxoinfo;
988 break;
989
990 case IPV6_RECVHOPLIMIT:
991 val = np->rxopt.bits.rxhlim;
992 break;
993
994 case IPV6_2292HOPLIMIT:
995 val = np->rxopt.bits.rxohlim;
996 break;
997
998 case IPV6_RECVRTHDR:
999 val = np->rxopt.bits.srcrt;
1000 break;
1001
1002 case IPV6_2292RTHDR:
1003 val = np->rxopt.bits.osrcrt;
1004 break;
1005
1006 case IPV6_HOPOPTS:
1007 case IPV6_RTHDRDSTOPTS:
1008 case IPV6_RTHDR:
1009 case IPV6_DSTOPTS:
1010 {
1011
1012 lock_sock(sk);
1013 len = ipv6_getsockopt_sticky(sk, np->opt,
1014 optname, optval, len);
1015 release_sock(sk);
1016 /* check if ipv6_getsockopt_sticky() returns err code */
1017 if (len < 0)
1018 return len;
1019 return put_user(len, optlen);
1020 }
1021
1022 case IPV6_RECVHOPOPTS:
1023 val = np->rxopt.bits.hopopts;
1024 break;
1025
1026 case IPV6_2292HOPOPTS:
1027 val = np->rxopt.bits.ohopopts;
1028 break;
1029
1030 case IPV6_RECVDSTOPTS:
1031 val = np->rxopt.bits.dstopts;
1032 break;
1033
1034 case IPV6_2292DSTOPTS:
1035 val = np->rxopt.bits.odstopts;
1036 break;
1037
1038 case IPV6_TCLASS:
1039 val = np->tclass;
1040 if (val < 0)
1041 val = 0;
1042 break;
1043
1044 case IPV6_RECVTCLASS:
1045 val = np->rxopt.bits.rxtclass;
1046 break;
1047
1048 case IPV6_FLOWINFO:
1049 val = np->rxopt.bits.rxflow;
1050 break;
1051
1052 case IPV6_UNICAST_HOPS:
1053 case IPV6_MULTICAST_HOPS:
1054 {
1055 struct dst_entry *dst;
1056
1057 if (optname == IPV6_UNICAST_HOPS)
1058 val = np->hop_limit;
1059 else
1060 val = np->mcast_hops;
1061
1062 dst = sk_dst_get(sk);
1063 if (dst) {
1064 if (val < 0)
1065 val = ip6_dst_hoplimit(dst);
1066 dst_release(dst);
1067 }
1068 if (val < 0)
1069 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1070 break;
1071 }
1072
1073 case IPV6_MULTICAST_LOOP:
1074 val = np->mc_loop;
1075 break;
1076
1077 case IPV6_MULTICAST_IF:
1078 val = np->mcast_oif;
1079 break;
1080
1081 case IPV6_MTU_DISCOVER:
1082 val = np->pmtudisc;
1083 break;
1084
1085 case IPV6_RECVERR:
1086 val = np->recverr;
1087 break;
1088
1089 case IPV6_FLOWINFO_SEND:
1090 val = np->sndflow;
1091 break;
1092
1093 case IPV6_ADDR_PREFERENCES:
1094 val = 0;
1095
1096 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1097 val |= IPV6_PREFER_SRC_TMP;
1098 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1099 val |= IPV6_PREFER_SRC_PUBLIC;
1100 else {
1101 /* XXX: should we return system default? */
1102 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1103 }
1104
1105 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1106 val |= IPV6_PREFER_SRC_COA;
1107 else
1108 val |= IPV6_PREFER_SRC_HOME;
1109 break;
1110
1111 default:
1112 return -ENOPROTOOPT;
1113 }
1114 len = min_t(unsigned int, sizeof(int), len);
1115 if(put_user(len, optlen))
1116 return -EFAULT;
1117 if(copy_to_user(optval,&val,len))
1118 return -EFAULT;
1119 return 0;
1120 }
1121
1122 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1123 char __user *optval, int __user *optlen)
1124 {
1125 int err;
1126
1127 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1128 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1129
1130 if(level != SOL_IPV6)
1131 return -ENOPROTOOPT;
1132
1133 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1134 #ifdef CONFIG_NETFILTER
1135 /* we need to exclude all possible ENOPROTOOPTs except default case */
1136 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1137 int len;
1138
1139 if (get_user(len, optlen))
1140 return -EFAULT;
1141
1142 lock_sock(sk);
1143 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1144 &len);
1145 release_sock(sk);
1146 if (err >= 0)
1147 err = put_user(len, optlen);
1148 }
1149 #endif
1150 return err;
1151 }
1152
1153 EXPORT_SYMBOL(ipv6_getsockopt);
1154
1155 #ifdef CONFIG_COMPAT
1156 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1157 char __user *optval, int __user *optlen)
1158 {
1159 int err;
1160
1161 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1162 if (udp_prot.compat_getsockopt != NULL)
1163 return udp_prot.compat_getsockopt(sk, level, optname,
1164 optval, optlen);
1165 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1166 }
1167
1168 if (level != SOL_IPV6)
1169 return -ENOPROTOOPT;
1170
1171 if (optname == MCAST_MSFILTER)
1172 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1173 ipv6_getsockopt);
1174
1175 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1176 #ifdef CONFIG_NETFILTER
1177 /* we need to exclude all possible ENOPROTOOPTs except default case */
1178 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1179 int len;
1180
1181 if (get_user(len, optlen))
1182 return -EFAULT;
1183
1184 lock_sock(sk);
1185 err = compat_nf_getsockopt(sk, PF_INET6,
1186 optname, optval, &len);
1187 release_sock(sk);
1188 if (err >= 0)
1189 err = put_user(len, optlen);
1190 }
1191 #endif
1192 return err;
1193 }
1194
1195 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1196 #endif
1197
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