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[linux-2.6/kvm.git] / net / ipv6 / ipv6_sockglue.c
blobea33b26512c220aa376e8c5051217e3417bdec95
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 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
344 /* remove any sticky options header with a zero option
345 * length, per RFC3542.
346 */
347 if (optlen == 0)
348 optval = NULL;
349 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
350 optlen & 0x7 || optlen > 8 * 255)
351 goto e_inval;
352
353 /* hop-by-hop / destination options are privileged option */
354 retv = -EPERM;
355 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
356 break;
357
358 opt = ipv6_renew_options(sk, np->opt, optname,
359 (struct ipv6_opt_hdr __user *)optval,
360 optlen);
361 if (IS_ERR(opt)) {
362 retv = PTR_ERR(opt);
363 break;
364 }
365
366 /* routing header option needs extra check */
367 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
368 struct ipv6_rt_hdr *rthdr = opt->srcrt;
369 switch (rthdr->type) {
370 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
371 case IPV6_SRCRT_TYPE_2:
372 break;
373 #endif
374 default:
375 goto sticky_done;
376 }
377
378 if ((rthdr->hdrlen & 1) ||
379 (rthdr->hdrlen >> 1) != rthdr->segments_left)
380 goto sticky_done;
381 }
382
383 retv = 0;
384 opt = ipv6_update_options(sk, opt);
385 sticky_done:
386 if (opt)
387 sock_kfree_s(sk, opt, opt->tot_len);
388 break;
389 }
390
391 case IPV6_2292PKTOPTIONS:
392 {
393 struct ipv6_txoptions *opt = NULL;
394 struct msghdr msg;
395 struct flowi fl;
396 int junk;
397
398 fl.fl6_flowlabel = 0;
399 fl.oif = sk->sk_bound_dev_if;
400
401 if (optlen == 0)
402 goto update;
403
404 /* 1K is probably excessive
405 * 1K is surely not enough, 2K per standard header is 16K.
406 */
407 retv = -EINVAL;
408 if (optlen > 64*1024)
409 break;
410
411 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
412 retv = -ENOBUFS;
413 if (opt == NULL)
414 break;
415
416 memset(opt, 0, sizeof(*opt));
417 opt->tot_len = sizeof(*opt) + optlen;
418 retv = -EFAULT;
419 if (copy_from_user(opt+1, optval, optlen))
420 goto done;
421
422 msg.msg_controllen = optlen;
423 msg.msg_control = (void*)(opt+1);
424
425 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
426 if (retv)
427 goto done;
428 update:
429 retv = 0;
430 opt = ipv6_update_options(sk, opt);
431 done:
432 if (opt)
433 sock_kfree_s(sk, opt, opt->tot_len);
434 break;
435 }
436 case IPV6_UNICAST_HOPS:
437 if (optlen < sizeof(int))
438 goto e_inval;
439 if (val > 255 || val < -1)
440 goto e_inval;
441 np->hop_limit = val;
442 retv = 0;
443 break;
444
445 case IPV6_MULTICAST_HOPS:
446 if (sk->sk_type == SOCK_STREAM)
447 break;
448 if (optlen < sizeof(int))
449 goto e_inval;
450 if (val > 255 || val < -1)
451 goto e_inval;
452 np->mcast_hops = val;
453 retv = 0;
454 break;
455
456 case IPV6_MULTICAST_LOOP:
457 if (optlen < sizeof(int))
458 goto e_inval;
459 if (val != valbool)
460 goto e_inval;
461 np->mc_loop = valbool;
462 retv = 0;
463 break;
464
465 case IPV6_MULTICAST_IF:
466 if (sk->sk_type == SOCK_STREAM)
467 break;
468 if (optlen < sizeof(int))
469 goto e_inval;
470
471 if (val) {
472 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
473 goto e_inval;
474
475 if (__dev_get_by_index(net, val) == NULL) {
476 retv = -ENODEV;
477 break;
478 }
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
488 if (optlen < sizeof(struct ipv6_mreq))
489 goto e_inval;
490
491 retv = -EPROTO;
492 if (inet_sk(sk)->is_icsk)
493 break;
494
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
510 if (optlen < sizeof(struct ipv6_mreq))
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
529 if (optlen < sizeof(struct group_req))
530 goto e_inval;
531
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
556 if (optlen < sizeof(struct group_source_req))
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);
579 /* prior join w/ different source is ok */
580 if (retv && retv != -EADDRINUSE)
581 break;
582 omode = MCAST_INCLUDE;
583 add = 1;
584 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
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 {
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 }
602 gsf = kmalloc(optlen,GFP_KERNEL);
603 if (!gsf) {
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:
630 if (optlen < sizeof(int))
631 goto e_inval;
632 retv = ip6_ra_control(sk, val);
633 break;
634 case IPV6_MTU_DISCOVER:
635 if (optlen < sizeof(int))
636 goto e_inval;
637 if (val<0 || val>3)
638 goto e_inval;
639 np->pmtudisc = val;
640 retv = 0;
641 break;
642 case IPV6_MTU:
643 if (optlen < sizeof(int))
644 goto e_inval;
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:
651 if (optlen < sizeof(int))
652 goto e_inval;
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:
659 if (optlen < sizeof(int))
660 goto e_inval;
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:
669 retv = -EPERM;
670 if (!capable(CAP_NET_ADMIN))
671 break;
672 retv = xfrm_user_policy(sk, optname, optval, optlen);
673 break;
674
675 case IPV6_ADDR_PREFERENCES:
676 {
677 unsigned int pref = 0;
678 unsigned int prefmask = ~0;
679
680 if (optlen < sizeof(int))
681 goto e_inval;
682
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);
705 pref_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;
720 pref_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 }
737 }
738
739 release_sock(sk);
740
741 return retv;
742
743 e_inval:
744 release_sock(sk);
745 return -EINVAL;
746 }
747
748 int 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
773 EXPORT_SYMBOL(ipv6_setsockopt);
774
775 #ifdef CONFIG_COMPAT
776 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
777 char __user *optval, int optlen)
778 {
779 int err;
780
781 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
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);
786 }
787
788 if (level != SOL_IPV6)
789 return -ENOPROTOOPT;
790
791 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
792 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
793 ipv6_setsockopt);
794
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 &&
799 optname != IPV6_XFRM_POLICY) {
800 lock_sock(sk);
801 err = compat_nf_setsockopt(sk, PF_INET6, optname,
802 optval, optlen);
803 release_sock(sk);
804 }
805 #endif
806 return err;
807 }
808
809 EXPORT_SYMBOL(compat_ipv6_setsockopt);
810 #endif
811
812 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
813 int optname, char __user *optval, int len)
814 {
815 struct ipv6_opt_hdr *hdr;
816
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)
838 return 0;
839
840 len = min_t(unsigned int, len, ipv6_optlen(hdr));
841 if (copy_to_user(optval, hdr, len))
842 return -EFAULT;
843 return len;
844 }
845
846 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
847 char __user *optval, int __user *optlen)
848 {
849 struct ipv6_pinfo *np = inet6_sk(sk);
850 int len;
851 int val;
852
853 if (ip6_mroute_opt(optname))
854 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
855
856 if (get_user(len, optlen))
857 return -EFAULT;
858 switch (optname) {
859 case IPV6_ADDRFORM:
860 if (sk->sk_protocol != IPPROTO_UDP &&
861 sk->sk_protocol != IPPROTO_UDPLITE &&
862 sk->sk_protocol != IPPROTO_TCP)
863 return -ENOPROTOOPT;
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;
877 if (gsf.gf_group.ss_family != AF_INET6)
878 return -EADDRNOTAVAIL;
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
886 case IPV6_2292PKTOPTIONS:
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 }
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 }
930 }
931 len -= msg.msg_controllen;
932 return put_user(len, optlen);
933 }
934 case IPV6_MTU:
935 {
936 struct dst_entry *dst;
937 val = 0;
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
954 case IPV6_RECVPKTINFO:
955 val = np->rxopt.bits.rxinfo;
956 break;
957
958 case IPV6_2292PKTINFO:
959 val = np->rxopt.bits.rxoinfo;
960 break;
961
962 case IPV6_RECVHOPLIMIT:
963 val = np->rxopt.bits.rxhlim;
964 break;
965
966 case IPV6_2292HOPLIMIT:
967 val = np->rxopt.bits.rxohlim;
968 break;
969
970 case IPV6_RECVRTHDR:
971 val = np->rxopt.bits.srcrt;
972 break;
973
974 case IPV6_2292RTHDR:
975 val = np->rxopt.bits.osrcrt;
976 break;
977
978 case IPV6_HOPOPTS:
979 case IPV6_RTHDRDSTOPTS:
980 case IPV6_RTHDR:
981 case IPV6_DSTOPTS:
982 {
983
984 lock_sock(sk);
985 len = ipv6_getsockopt_sticky(sk, np->opt,
986 optname, optval, len);
987 release_sock(sk);
988 /* check if ipv6_getsockopt_sticky() returns err code */
989 if (len < 0)
990 return len;
991 return put_user(len, optlen);
992 }
993
994 case IPV6_RECVHOPOPTS:
995 val = np->rxopt.bits.hopopts;
996 break;
997
998 case IPV6_2292HOPOPTS:
999 val = np->rxopt.bits.ohopopts;
1000 break;
1001
1002 case IPV6_RECVDSTOPTS:
1003 val = np->rxopt.bits.dstopts;
1004 break;
1005
1006 case IPV6_2292DSTOPTS:
1007 val = np->rxopt.bits.odstopts;
1008 break;
1009
1010 case IPV6_TCLASS:
1011 val = np->tclass;
1012 if (val < 0)
1013 val = 0;
1014 break;
1015
1016 case IPV6_RECVTCLASS:
1017 val = np->rxopt.bits.rxtclass;
1018 break;
1019
1020 case IPV6_FLOWINFO:
1021 val = np->rxopt.bits.rxflow;
1022 break;
1023
1024 case IPV6_UNICAST_HOPS:
1025 case IPV6_MULTICAST_HOPS:
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)
1037 val = ip6_dst_hoplimit(dst);
1038 dst_release(dst);
1039 }
1040 if (val < 0)
1041 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1042 break;
1043 }
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
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
1083 default:
1084 return -ENOPROTOOPT;
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
1094 int 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
1107 /* we need to exclude all possible ENOPROTOOPTs except default case */
1108 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
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
1125 EXPORT_SYMBOL(ipv6_getsockopt);
1126
1127 #ifdef CONFIG_COMPAT
1128 int compat_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 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);
1138 }
1139
1140 if (level != SOL_IPV6)
1141 return -ENOPROTOOPT;
1142
1143 if (optname == MCAST_MSFILTER)
1144 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1145 ipv6_getsockopt);
1146
1147 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1148 #ifdef CONFIG_NETFILTER
1149 /* we need to exclude all possible ENOPROTOOPTs except default case */
1150 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1151 int len;
1152
1153 if (get_user(len, optlen))
1154 return -EFAULT;
1155
1156 lock_sock(sk);
1157 err = compat_nf_getsockopt(sk, PF_INET6,
1158 optname, optval, &len);
1159 release_sock(sk);
1160 if (err >= 0)
1161 err = put_user(len, optlen);
1162 }
1163 #endif
1164 return err;
1165 }
1166
1167 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1168 #endif
1169
kernel-based virtual machine