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airport: remove useless return in a function returning void
[linux/fpc-iii.git] / net / ipv6 / ipv6_sockglue.c
blob2aa294be0c790043bbc148a71ce030e4e5fbcc4c
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 (optval == NULL)
350 goto e_inval;
351 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
352 optlen & 0x7 || optlen > 8 * 255)
353 goto e_inval;
354
355 /* hop-by-hop / destination options are privileged option */
356 retv = -EPERM;
357 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
358 break;
359
360 opt = ipv6_renew_options(sk, np->opt, optname,
361 (struct ipv6_opt_hdr __user *)optval,
362 optlen);
363 if (IS_ERR(opt)) {
364 retv = PTR_ERR(opt);
365 break;
366 }
367
368 /* routing header option needs extra check */
369 retv = -EINVAL;
370 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
371 struct ipv6_rt_hdr *rthdr = opt->srcrt;
372 switch (rthdr->type) {
373 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
374 case IPV6_SRCRT_TYPE_2:
375 if (rthdr->hdrlen != 2 ||
376 rthdr->segments_left != 1)
377 goto sticky_done;
378
379 break;
380 #endif
381 default:
382 goto sticky_done;
383 }
384
385 if ((rthdr->hdrlen & 1) ||
386 (rthdr->hdrlen >> 1) != rthdr->segments_left)
387 goto sticky_done;
388 }
389
390 retv = 0;
391 opt = ipv6_update_options(sk, opt);
392 sticky_done:
393 if (opt)
394 sock_kfree_s(sk, opt, opt->tot_len);
395 break;
396 }
397
398 case IPV6_2292PKTOPTIONS:
399 {
400 struct ipv6_txoptions *opt = NULL;
401 struct msghdr msg;
402 struct flowi fl;
403 int junk;
404
405 fl.fl6_flowlabel = 0;
406 fl.oif = sk->sk_bound_dev_if;
407
408 if (optlen == 0)
409 goto update;
410
411 /* 1K is probably excessive
412 * 1K is surely not enough, 2K per standard header is 16K.
413 */
414 retv = -EINVAL;
415 if (optlen > 64*1024)
416 break;
417
418 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
419 retv = -ENOBUFS;
420 if (opt == NULL)
421 break;
422
423 memset(opt, 0, sizeof(*opt));
424 opt->tot_len = sizeof(*opt) + optlen;
425 retv = -EFAULT;
426 if (copy_from_user(opt+1, optval, optlen))
427 goto done;
428
429 msg.msg_controllen = optlen;
430 msg.msg_control = (void*)(opt+1);
431
432 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
433 if (retv)
434 goto done;
435 update:
436 retv = 0;
437 opt = ipv6_update_options(sk, opt);
438 done:
439 if (opt)
440 sock_kfree_s(sk, opt, opt->tot_len);
441 break;
442 }
443 case IPV6_UNICAST_HOPS:
444 if (optlen < sizeof(int))
445 goto e_inval;
446 if (val > 255 || val < -1)
447 goto e_inval;
448 np->hop_limit = val;
449 retv = 0;
450 break;
451
452 case IPV6_MULTICAST_HOPS:
453 if (sk->sk_type == SOCK_STREAM)
454 break;
455 if (optlen < sizeof(int))
456 goto e_inval;
457 if (val > 255 || val < -1)
458 goto e_inval;
459 np->mcast_hops = val;
460 retv = 0;
461 break;
462
463 case IPV6_MULTICAST_LOOP:
464 if (optlen < sizeof(int))
465 goto e_inval;
466 if (val != valbool)
467 goto e_inval;
468 np->mc_loop = valbool;
469 retv = 0;
470 break;
471
472 case IPV6_MULTICAST_IF:
473 if (sk->sk_type == SOCK_STREAM)
474 break;
475 if (optlen < sizeof(int))
476 goto e_inval;
477
478 if (val) {
479 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
480 goto e_inval;
481
482 if (__dev_get_by_index(net, val) == NULL) {
483 retv = -ENODEV;
484 break;
485 }
486 }
487 np->mcast_oif = val;
488 retv = 0;
489 break;
490 case IPV6_ADD_MEMBERSHIP:
491 case IPV6_DROP_MEMBERSHIP:
492 {
493 struct ipv6_mreq mreq;
494
495 if (optlen < sizeof(struct ipv6_mreq))
496 goto e_inval;
497
498 retv = -EPROTO;
499 if (inet_sk(sk)->is_icsk)
500 break;
501
502 retv = -EFAULT;
503 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
504 break;
505
506 if (optname == IPV6_ADD_MEMBERSHIP)
507 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
508 else
509 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
510 break;
511 }
512 case IPV6_JOIN_ANYCAST:
513 case IPV6_LEAVE_ANYCAST:
514 {
515 struct ipv6_mreq mreq;
516
517 if (optlen < sizeof(struct ipv6_mreq))
518 goto e_inval;
519
520 retv = -EFAULT;
521 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
522 break;
523
524 if (optname == IPV6_JOIN_ANYCAST)
525 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
526 else
527 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
528 break;
529 }
530 case MCAST_JOIN_GROUP:
531 case MCAST_LEAVE_GROUP:
532 {
533 struct group_req greq;
534 struct sockaddr_in6 *psin6;
535
536 if (optlen < sizeof(struct group_req))
537 goto e_inval;
538
539 retv = -EFAULT;
540 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
541 break;
542 if (greq.gr_group.ss_family != AF_INET6) {
543 retv = -EADDRNOTAVAIL;
544 break;
545 }
546 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
547 if (optname == MCAST_JOIN_GROUP)
548 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
549 &psin6->sin6_addr);
550 else
551 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
552 &psin6->sin6_addr);
553 break;
554 }
555 case MCAST_JOIN_SOURCE_GROUP:
556 case MCAST_LEAVE_SOURCE_GROUP:
557 case MCAST_BLOCK_SOURCE:
558 case MCAST_UNBLOCK_SOURCE:
559 {
560 struct group_source_req greqs;
561 int omode, add;
562
563 if (optlen < sizeof(struct group_source_req))
564 goto e_inval;
565 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
566 retv = -EFAULT;
567 break;
568 }
569 if (greqs.gsr_group.ss_family != AF_INET6 ||
570 greqs.gsr_source.ss_family != AF_INET6) {
571 retv = -EADDRNOTAVAIL;
572 break;
573 }
574 if (optname == MCAST_BLOCK_SOURCE) {
575 omode = MCAST_EXCLUDE;
576 add = 1;
577 } else if (optname == MCAST_UNBLOCK_SOURCE) {
578 omode = MCAST_EXCLUDE;
579 add = 0;
580 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
581 struct sockaddr_in6 *psin6;
582
583 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
584 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
585 &psin6->sin6_addr);
586 /* prior join w/ different source is ok */
587 if (retv && retv != -EADDRINUSE)
588 break;
589 omode = MCAST_INCLUDE;
590 add = 1;
591 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
592 omode = MCAST_INCLUDE;
593 add = 0;
594 }
595 retv = ip6_mc_source(add, omode, sk, &greqs);
596 break;
597 }
598 case MCAST_MSFILTER:
599 {
600 extern int sysctl_mld_max_msf;
601 struct group_filter *gsf;
602
603 if (optlen < GROUP_FILTER_SIZE(0))
604 goto e_inval;
605 if (optlen > sysctl_optmem_max) {
606 retv = -ENOBUFS;
607 break;
608 }
609 gsf = kmalloc(optlen,GFP_KERNEL);
610 if (!gsf) {
611 retv = -ENOBUFS;
612 break;
613 }
614 retv = -EFAULT;
615 if (copy_from_user(gsf, optval, optlen)) {
616 kfree(gsf);
617 break;
618 }
619 /* numsrc >= (4G-140)/128 overflow in 32 bits */
620 if (gsf->gf_numsrc >= 0x1ffffffU ||
621 gsf->gf_numsrc > sysctl_mld_max_msf) {
622 kfree(gsf);
623 retv = -ENOBUFS;
624 break;
625 }
626 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
627 kfree(gsf);
628 retv = -EINVAL;
629 break;
630 }
631 retv = ip6_mc_msfilter(sk, gsf);
632 kfree(gsf);
633
634 break;
635 }
636 case IPV6_ROUTER_ALERT:
637 if (optlen < sizeof(int))
638 goto e_inval;
639 retv = ip6_ra_control(sk, val);
640 break;
641 case IPV6_MTU_DISCOVER:
642 if (optlen < sizeof(int))
643 goto e_inval;
644 if (val<0 || val>3)
645 goto e_inval;
646 np->pmtudisc = val;
647 retv = 0;
648 break;
649 case IPV6_MTU:
650 if (optlen < sizeof(int))
651 goto e_inval;
652 if (val && val < IPV6_MIN_MTU)
653 goto e_inval;
654 np->frag_size = val;
655 retv = 0;
656 break;
657 case IPV6_RECVERR:
658 if (optlen < sizeof(int))
659 goto e_inval;
660 np->recverr = valbool;
661 if (!val)
662 skb_queue_purge(&sk->sk_error_queue);
663 retv = 0;
664 break;
665 case IPV6_FLOWINFO_SEND:
666 if (optlen < sizeof(int))
667 goto e_inval;
668 np->sndflow = valbool;
669 retv = 0;
670 break;
671 case IPV6_FLOWLABEL_MGR:
672 retv = ipv6_flowlabel_opt(sk, optval, optlen);
673 break;
674 case IPV6_IPSEC_POLICY:
675 case IPV6_XFRM_POLICY:
676 retv = -EPERM;
677 if (!capable(CAP_NET_ADMIN))
678 break;
679 retv = xfrm_user_policy(sk, optname, optval, optlen);
680 break;
681
682 case IPV6_ADDR_PREFERENCES:
683 {
684 unsigned int pref = 0;
685 unsigned int prefmask = ~0;
686
687 if (optlen < sizeof(int))
688 goto e_inval;
689
690 retv = -EINVAL;
691
692 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
693 switch (val & (IPV6_PREFER_SRC_PUBLIC|
694 IPV6_PREFER_SRC_TMP|
695 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
696 case IPV6_PREFER_SRC_PUBLIC:
697 pref |= IPV6_PREFER_SRC_PUBLIC;
698 break;
699 case IPV6_PREFER_SRC_TMP:
700 pref |= IPV6_PREFER_SRC_TMP;
701 break;
702 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
703 break;
704 case 0:
705 goto pref_skip_pubtmp;
706 default:
707 goto e_inval;
708 }
709
710 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
711 IPV6_PREFER_SRC_TMP);
712 pref_skip_pubtmp:
713
714 /* check HOME/COA conflicts */
715 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
716 case IPV6_PREFER_SRC_HOME:
717 break;
718 case IPV6_PREFER_SRC_COA:
719 pref |= IPV6_PREFER_SRC_COA;
720 case 0:
721 goto pref_skip_coa;
722 default:
723 goto e_inval;
724 }
725
726 prefmask &= ~IPV6_PREFER_SRC_COA;
727 pref_skip_coa:
728
729 /* check CGA/NONCGA conflicts */
730 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
731 case IPV6_PREFER_SRC_CGA:
732 case IPV6_PREFER_SRC_NONCGA:
733 case 0:
734 break;
735 default:
736 goto e_inval;
737 }
738
739 np->srcprefs = (np->srcprefs & prefmask) | pref;
740 retv = 0;
741
742 break;
743 }
744 }
745
746 release_sock(sk);
747
748 return retv;
749
750 e_inval:
751 release_sock(sk);
752 return -EINVAL;
753 }
754
755 int ipv6_setsockopt(struct sock *sk, int level, int optname,
756 char __user *optval, int optlen)
757 {
758 int err;
759
760 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
761 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
762
763 if (level != SOL_IPV6)
764 return -ENOPROTOOPT;
765
766 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
767 #ifdef CONFIG_NETFILTER
768 /* we need to exclude all possible ENOPROTOOPTs except default case */
769 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
770 optname != IPV6_XFRM_POLICY) {
771 lock_sock(sk);
772 err = nf_setsockopt(sk, PF_INET6, optname, optval,
773 optlen);
774 release_sock(sk);
775 }
776 #endif
777 return err;
778 }
779
780 EXPORT_SYMBOL(ipv6_setsockopt);
781
782 #ifdef CONFIG_COMPAT
783 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
784 char __user *optval, int optlen)
785 {
786 int err;
787
788 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
789 if (udp_prot.compat_setsockopt != NULL)
790 return udp_prot.compat_setsockopt(sk, level, optname,
791 optval, optlen);
792 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
793 }
794
795 if (level != SOL_IPV6)
796 return -ENOPROTOOPT;
797
798 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
799 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
800 ipv6_setsockopt);
801
802 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
803 #ifdef CONFIG_NETFILTER
804 /* we need to exclude all possible ENOPROTOOPTs except default case */
805 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
806 optname != IPV6_XFRM_POLICY) {
807 lock_sock(sk);
808 err = compat_nf_setsockopt(sk, PF_INET6, optname,
809 optval, optlen);
810 release_sock(sk);
811 }
812 #endif
813 return err;
814 }
815
816 EXPORT_SYMBOL(compat_ipv6_setsockopt);
817 #endif
818
819 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
820 int optname, char __user *optval, int len)
821 {
822 struct ipv6_opt_hdr *hdr;
823
824 if (!opt)
825 return 0;
826
827 switch(optname) {
828 case IPV6_HOPOPTS:
829 hdr = opt->hopopt;
830 break;
831 case IPV6_RTHDRDSTOPTS:
832 hdr = opt->dst0opt;
833 break;
834 case IPV6_RTHDR:
835 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
836 break;
837 case IPV6_DSTOPTS:
838 hdr = opt->dst1opt;
839 break;
840 default:
841 return -EINVAL; /* should not happen */
842 }
843
844 if (!hdr)
845 return 0;
846
847 len = min_t(unsigned int, len, ipv6_optlen(hdr));
848 if (copy_to_user(optval, hdr, len))
849 return -EFAULT;
850 return len;
851 }
852
853 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
854 char __user *optval, int __user *optlen)
855 {
856 struct ipv6_pinfo *np = inet6_sk(sk);
857 int len;
858 int val;
859
860 if (ip6_mroute_opt(optname))
861 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
862
863 if (get_user(len, optlen))
864 return -EFAULT;
865 switch (optname) {
866 case IPV6_ADDRFORM:
867 if (sk->sk_protocol != IPPROTO_UDP &&
868 sk->sk_protocol != IPPROTO_UDPLITE &&
869 sk->sk_protocol != IPPROTO_TCP)
870 return -ENOPROTOOPT;
871 if (sk->sk_state != TCP_ESTABLISHED)
872 return -ENOTCONN;
873 val = sk->sk_family;
874 break;
875 case MCAST_MSFILTER:
876 {
877 struct group_filter gsf;
878 int err;
879
880 if (len < GROUP_FILTER_SIZE(0))
881 return -EINVAL;
882 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
883 return -EFAULT;
884 if (gsf.gf_group.ss_family != AF_INET6)
885 return -EADDRNOTAVAIL;
886 lock_sock(sk);
887 err = ip6_mc_msfget(sk, &gsf,
888 (struct group_filter __user *)optval, optlen);
889 release_sock(sk);
890 return err;
891 }
892
893 case IPV6_2292PKTOPTIONS:
894 {
895 struct msghdr msg;
896 struct sk_buff *skb;
897
898 if (sk->sk_type != SOCK_STREAM)
899 return -ENOPROTOOPT;
900
901 msg.msg_control = optval;
902 msg.msg_controllen = len;
903 msg.msg_flags = 0;
904
905 lock_sock(sk);
906 skb = np->pktoptions;
907 if (skb)
908 atomic_inc(&skb->users);
909 release_sock(sk);
910
911 if (skb) {
912 int err = datagram_recv_ctl(sk, &msg, skb);
913 kfree_skb(skb);
914 if (err)
915 return err;
916 } else {
917 if (np->rxopt.bits.rxinfo) {
918 struct in6_pktinfo src_info;
919 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
920 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
921 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
922 }
923 if (np->rxopt.bits.rxhlim) {
924 int hlim = np->mcast_hops;
925 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
926 }
927 if (np->rxopt.bits.rxoinfo) {
928 struct in6_pktinfo src_info;
929 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
930 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
931 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
932 }
933 if (np->rxopt.bits.rxohlim) {
934 int hlim = np->mcast_hops;
935 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
936 }
937 }
938 len -= msg.msg_controllen;
939 return put_user(len, optlen);
940 }
941 case IPV6_MTU:
942 {
943 struct dst_entry *dst;
944 val = 0;
945 lock_sock(sk);
946 dst = sk_dst_get(sk);
947 if (dst) {
948 val = dst_mtu(dst);
949 dst_release(dst);
950 }
951 release_sock(sk);
952 if (!val)
953 return -ENOTCONN;
954 break;
955 }
956
957 case IPV6_V6ONLY:
958 val = np->ipv6only;
959 break;
960
961 case IPV6_RECVPKTINFO:
962 val = np->rxopt.bits.rxinfo;
963 break;
964
965 case IPV6_2292PKTINFO:
966 val = np->rxopt.bits.rxoinfo;
967 break;
968
969 case IPV6_RECVHOPLIMIT:
970 val = np->rxopt.bits.rxhlim;
971 break;
972
973 case IPV6_2292HOPLIMIT:
974 val = np->rxopt.bits.rxohlim;
975 break;
976
977 case IPV6_RECVRTHDR:
978 val = np->rxopt.bits.srcrt;
979 break;
980
981 case IPV6_2292RTHDR:
982 val = np->rxopt.bits.osrcrt;
983 break;
984
985 case IPV6_HOPOPTS:
986 case IPV6_RTHDRDSTOPTS:
987 case IPV6_RTHDR:
988 case IPV6_DSTOPTS:
989 {
990
991 lock_sock(sk);
992 len = ipv6_getsockopt_sticky(sk, np->opt,
993 optname, optval, len);
994 release_sock(sk);
995 /* check if ipv6_getsockopt_sticky() returns err code */
996 if (len < 0)
997 return len;
998 return put_user(len, optlen);
999 }
1000
1001 case IPV6_RECVHOPOPTS:
1002 val = np->rxopt.bits.hopopts;
1003 break;
1004
1005 case IPV6_2292HOPOPTS:
1006 val = np->rxopt.bits.ohopopts;
1007 break;
1008
1009 case IPV6_RECVDSTOPTS:
1010 val = np->rxopt.bits.dstopts;
1011 break;
1012
1013 case IPV6_2292DSTOPTS:
1014 val = np->rxopt.bits.odstopts;
1015 break;
1016
1017 case IPV6_TCLASS:
1018 val = np->tclass;
1019 if (val < 0)
1020 val = 0;
1021 break;
1022
1023 case IPV6_RECVTCLASS:
1024 val = np->rxopt.bits.rxtclass;
1025 break;
1026
1027 case IPV6_FLOWINFO:
1028 val = np->rxopt.bits.rxflow;
1029 break;
1030
1031 case IPV6_UNICAST_HOPS:
1032 case IPV6_MULTICAST_HOPS:
1033 {
1034 struct dst_entry *dst;
1035
1036 if (optname == IPV6_UNICAST_HOPS)
1037 val = np->hop_limit;
1038 else
1039 val = np->mcast_hops;
1040
1041 dst = sk_dst_get(sk);
1042 if (dst) {
1043 if (val < 0)
1044 val = ip6_dst_hoplimit(dst);
1045 dst_release(dst);
1046 }
1047 if (val < 0)
1048 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1049 break;
1050 }
1051
1052 case IPV6_MULTICAST_LOOP:
1053 val = np->mc_loop;
1054 break;
1055
1056 case IPV6_MULTICAST_IF:
1057 val = np->mcast_oif;
1058 break;
1059
1060 case IPV6_MTU_DISCOVER:
1061 val = np->pmtudisc;
1062 break;
1063
1064 case IPV6_RECVERR:
1065 val = np->recverr;
1066 break;
1067
1068 case IPV6_FLOWINFO_SEND:
1069 val = np->sndflow;
1070 break;
1071
1072 case IPV6_ADDR_PREFERENCES:
1073 val = 0;
1074
1075 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1076 val |= IPV6_PREFER_SRC_TMP;
1077 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1078 val |= IPV6_PREFER_SRC_PUBLIC;
1079 else {
1080 /* XXX: should we return system default? */
1081 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1082 }
1083
1084 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1085 val |= IPV6_PREFER_SRC_COA;
1086 else
1087 val |= IPV6_PREFER_SRC_HOME;
1088 break;
1089
1090 default:
1091 return -ENOPROTOOPT;
1092 }
1093 len = min_t(unsigned int, sizeof(int), len);
1094 if(put_user(len, optlen))
1095 return -EFAULT;
1096 if(copy_to_user(optval,&val,len))
1097 return -EFAULT;
1098 return 0;
1099 }
1100
1101 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1102 char __user *optval, int __user *optlen)
1103 {
1104 int err;
1105
1106 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1107 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1108
1109 if(level != SOL_IPV6)
1110 return -ENOPROTOOPT;
1111
1112 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1113 #ifdef CONFIG_NETFILTER
1114 /* we need to exclude all possible ENOPROTOOPTs except default case */
1115 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1116 int len;
1117
1118 if (get_user(len, optlen))
1119 return -EFAULT;
1120
1121 lock_sock(sk);
1122 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1123 &len);
1124 release_sock(sk);
1125 if (err >= 0)
1126 err = put_user(len, optlen);
1127 }
1128 #endif
1129 return err;
1130 }
1131
1132 EXPORT_SYMBOL(ipv6_getsockopt);
1133
1134 #ifdef CONFIG_COMPAT
1135 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1136 char __user *optval, int __user *optlen)
1137 {
1138 int err;
1139
1140 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1141 if (udp_prot.compat_getsockopt != NULL)
1142 return udp_prot.compat_getsockopt(sk, level, optname,
1143 optval, optlen);
1144 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1145 }
1146
1147 if (level != SOL_IPV6)
1148 return -ENOPROTOOPT;
1149
1150 if (optname == MCAST_MSFILTER)
1151 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1152 ipv6_getsockopt);
1153
1154 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1155 #ifdef CONFIG_NETFILTER
1156 /* we need to exclude all possible ENOPROTOOPTs except default case */
1157 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1158 int len;
1159
1160 if (get_user(len, optlen))
1161 return -EFAULT;
1162
1163 lock_sock(sk);
1164 err = compat_nf_getsockopt(sk, PF_INET6,
1165 optname, optval, &len);
1166 release_sock(sk);
1167 if (err >= 0)
1168 err = put_user(len, optlen);
1169 }
1170 #endif
1171 return err;
1172 }
1173
1174 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1175 #endif
1176
Linux with added FPC-III support