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Linux v2.6.17-rc2
[linux-2.6/next.git] / net / ipv6 / ipv6_sockglue.c
blob4c20eeb3d56844859754cb207c8ad705f6558c4b
1 /*
2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_sockglue.c
9 *
10 * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * FIXME: Make the setsockopt code POSIX compliant: That is
18 *
19 * o Return -EINVAL for setsockopt of short lengths
20 * o Truncate getsockopt returns
21 * o Return an optlen of the truncated length if need be
22 *
23 * Changes:
24 * David L Stevens <dlstevens@us.ibm.com>:
25 * - added multicast source filtering API for MLDv2
26 */
27
28 #include <linux/module.h>
29 #include <linux/capability.h>
30 #include <linux/config.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/sched.h>
36 #include <linux/net.h>
37 #include <linux/in6.h>
38 #include <linux/netdevice.h>
39 #include <linux/if_arp.h>
40 #include <linux/init.h>
41 #include <linux/sysctl.h>
42 #include <linux/netfilter.h>
43
44 #include <net/sock.h>
45 #include <net/snmp.h>
46 #include <net/ipv6.h>
47 #include <net/ndisc.h>
48 #include <net/protocol.h>
49 #include <net/transp_v6.h>
50 #include <net/ip6_route.h>
51 #include <net/addrconf.h>
52 #include <net/inet_common.h>
53 #include <net/tcp.h>
54 #include <net/udp.h>
55 #include <net/xfrm.h>
56
57 #include <asm/uaccess.h>
58
59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
60
61 static struct packet_type ipv6_packet_type = {
62 .type = __constant_htons(ETH_P_IPV6),
63 .func = ipv6_rcv,
64 };
65
66 struct ip6_ra_chain *ip6_ra_chain;
67 DEFINE_RWLOCK(ip6_ra_lock);
68
69 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
70 {
71 struct ip6_ra_chain *ra, *new_ra, **rap;
72
73 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
74 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
75 return -EINVAL;
76
77 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
78
79 write_lock_bh(&ip6_ra_lock);
80 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
81 if (ra->sk == sk) {
82 if (sel>=0) {
83 write_unlock_bh(&ip6_ra_lock);
84 kfree(new_ra);
85 return -EADDRINUSE;
86 }
87
88 *rap = ra->next;
89 write_unlock_bh(&ip6_ra_lock);
90
91 if (ra->destructor)
92 ra->destructor(sk);
93 sock_put(sk);
94 kfree(ra);
95 return 0;
96 }
97 }
98 if (new_ra == NULL) {
99 write_unlock_bh(&ip6_ra_lock);
100 return -ENOBUFS;
101 }
102 new_ra->sk = sk;
103 new_ra->sel = sel;
104 new_ra->destructor = destructor;
105 new_ra->next = ra;
106 *rap = new_ra;
107 sock_hold(sk);
108 write_unlock_bh(&ip6_ra_lock);
109 return 0;
110 }
111
112 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
113 char __user *optval, int optlen)
114 {
115 struct ipv6_pinfo *np = inet6_sk(sk);
116 int val, valbool;
117 int retv = -ENOPROTOOPT;
118
119 if (optval == NULL)
120 val=0;
121 else if (get_user(val, (int __user *) optval))
122 return -EFAULT;
123
124 valbool = (val!=0);
125
126 lock_sock(sk);
127
128 switch (optname) {
129
130 case IPV6_ADDRFORM:
131 if (val == PF_INET) {
132 struct ipv6_txoptions *opt;
133 struct sk_buff *pktopt;
134
135 if (sk->sk_protocol != IPPROTO_UDP &&
136 sk->sk_protocol != IPPROTO_TCP)
137 break;
138
139 if (sk->sk_state != TCP_ESTABLISHED) {
140 retv = -ENOTCONN;
141 break;
142 }
143
144 if (ipv6_only_sock(sk) ||
145 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
146 retv = -EADDRNOTAVAIL;
147 break;
148 }
149
150 fl6_free_socklist(sk);
151 ipv6_sock_mc_close(sk);
152
153 /*
154 * Sock is moving from IPv6 to IPv4 (sk_prot), so
155 * remove it from the refcnt debug socks count in the
156 * original family...
157 */
158 sk_refcnt_debug_dec(sk);
159
160 if (sk->sk_protocol == IPPROTO_TCP) {
161 struct inet_connection_sock *icsk = inet_csk(sk);
162
163 local_bh_disable();
164 sock_prot_dec_use(sk->sk_prot);
165 sock_prot_inc_use(&tcp_prot);
166 local_bh_enable();
167 sk->sk_prot = &tcp_prot;
168 icsk->icsk_af_ops = &ipv4_specific;
169 sk->sk_socket->ops = &inet_stream_ops;
170 sk->sk_family = PF_INET;
171 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
172 } else {
173 local_bh_disable();
174 sock_prot_dec_use(sk->sk_prot);
175 sock_prot_inc_use(&udp_prot);
176 local_bh_enable();
177 sk->sk_prot = &udp_prot;
178 sk->sk_socket->ops = &inet_dgram_ops;
179 sk->sk_family = PF_INET;
180 }
181 opt = xchg(&np->opt, NULL);
182 if (opt)
183 sock_kfree_s(sk, opt, opt->tot_len);
184 pktopt = xchg(&np->pktoptions, NULL);
185 if (pktopt)
186 kfree_skb(pktopt);
187
188 sk->sk_destruct = inet_sock_destruct;
189 /*
190 * ... and add it to the refcnt debug socks count
191 * in the new family. -acme
192 */
193 sk_refcnt_debug_inc(sk);
194 module_put(THIS_MODULE);
195 retv = 0;
196 break;
197 }
198 goto e_inval;
199
200 case IPV6_V6ONLY:
201 if (inet_sk(sk)->num)
202 goto e_inval;
203 np->ipv6only = valbool;
204 retv = 0;
205 break;
206
207 case IPV6_RECVPKTINFO:
208 np->rxopt.bits.rxinfo = valbool;
209 retv = 0;
210 break;
211
212 case IPV6_2292PKTINFO:
213 np->rxopt.bits.rxoinfo = valbool;
214 retv = 0;
215 break;
216
217 case IPV6_RECVHOPLIMIT:
218 np->rxopt.bits.rxhlim = valbool;
219 retv = 0;
220 break;
221
222 case IPV6_2292HOPLIMIT:
223 np->rxopt.bits.rxohlim = valbool;
224 retv = 0;
225 break;
226
227 case IPV6_RECVRTHDR:
228 if (val < 0 || val > 2)
229 goto e_inval;
230 np->rxopt.bits.srcrt = val;
231 retv = 0;
232 break;
233
234 case IPV6_2292RTHDR:
235 if (val < 0 || val > 2)
236 goto e_inval;
237 np->rxopt.bits.osrcrt = val;
238 retv = 0;
239 break;
240
241 case IPV6_RECVHOPOPTS:
242 np->rxopt.bits.hopopts = valbool;
243 retv = 0;
244 break;
245
246 case IPV6_2292HOPOPTS:
247 np->rxopt.bits.ohopopts = valbool;
248 retv = 0;
249 break;
250
251 case IPV6_RECVDSTOPTS:
252 np->rxopt.bits.dstopts = valbool;
253 retv = 0;
254 break;
255
256 case IPV6_2292DSTOPTS:
257 np->rxopt.bits.odstopts = valbool;
258 retv = 0;
259 break;
260
261 case IPV6_TCLASS:
262 if (val < 0 || val > 0xff)
263 goto e_inval;
264 np->tclass = val;
265 retv = 0;
266 break;
267
268 case IPV6_RECVTCLASS:
269 np->rxopt.bits.rxtclass = valbool;
270 retv = 0;
271 break;
272
273 case IPV6_FLOWINFO:
274 np->rxopt.bits.rxflow = valbool;
275 retv = 0;
276 break;
277
278 case IPV6_HOPOPTS:
279 case IPV6_RTHDRDSTOPTS:
280 case IPV6_RTHDR:
281 case IPV6_DSTOPTS:
282 {
283 struct ipv6_txoptions *opt;
284 if (optlen == 0)
285 optval = NULL;
286
287 /* hop-by-hop / destination options are privileged option */
288 retv = -EPERM;
289 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
290 break;
291
292 retv = -EINVAL;
293 if (optlen & 0x7 || optlen > 8 * 255)
294 break;
295
296 opt = ipv6_renew_options(sk, np->opt, optname,
297 (struct ipv6_opt_hdr __user *)optval,
298 optlen);
299 if (IS_ERR(opt)) {
300 retv = PTR_ERR(opt);
301 break;
302 }
303
304 /* routing header option needs extra check */
305 if (optname == IPV6_RTHDR && opt->srcrt) {
306 struct ipv6_rt_hdr *rthdr = opt->srcrt;
307 if (rthdr->type)
308 goto sticky_done;
309 if ((rthdr->hdrlen & 1) ||
310 (rthdr->hdrlen >> 1) != rthdr->segments_left)
311 goto sticky_done;
312 }
313
314 retv = 0;
315 if (inet_sk(sk)->is_icsk) {
316 if (opt) {
317 struct inet_connection_sock *icsk = inet_csk(sk);
318 if (!((1 << sk->sk_state) &
319 (TCPF_LISTEN | TCPF_CLOSE))
320 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
321 icsk->icsk_ext_hdr_len =
322 opt->opt_flen + opt->opt_nflen;
323 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
324 }
325 }
326 opt = xchg(&np->opt, opt);
327 sk_dst_reset(sk);
328 } else {
329 write_lock(&sk->sk_dst_lock);
330 opt = xchg(&np->opt, opt);
331 write_unlock(&sk->sk_dst_lock);
332 sk_dst_reset(sk);
333 }
334 sticky_done:
335 if (opt)
336 sock_kfree_s(sk, opt, opt->tot_len);
337 break;
338 }
339
340 case IPV6_2292PKTOPTIONS:
341 {
342 struct ipv6_txoptions *opt = NULL;
343 struct msghdr msg;
344 struct flowi fl;
345 int junk;
346
347 fl.fl6_flowlabel = 0;
348 fl.oif = sk->sk_bound_dev_if;
349
350 if (optlen == 0)
351 goto update;
352
353 /* 1K is probably excessive
354 * 1K is surely not enough, 2K per standard header is 16K.
355 */
356 retv = -EINVAL;
357 if (optlen > 64*1024)
358 break;
359
360 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
361 retv = -ENOBUFS;
362 if (opt == NULL)
363 break;
364
365 memset(opt, 0, sizeof(*opt));
366 opt->tot_len = sizeof(*opt) + optlen;
367 retv = -EFAULT;
368 if (copy_from_user(opt+1, optval, optlen))
369 goto done;
370
371 msg.msg_controllen = optlen;
372 msg.msg_control = (void*)(opt+1);
373
374 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
375 if (retv)
376 goto done;
377 update:
378 retv = 0;
379 if (inet_sk(sk)->is_icsk) {
380 if (opt) {
381 struct inet_connection_sock *icsk = inet_csk(sk);
382 if (!((1 << sk->sk_state) &
383 (TCPF_LISTEN | TCPF_CLOSE))
384 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
385 icsk->icsk_ext_hdr_len =
386 opt->opt_flen + opt->opt_nflen;
387 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
388 }
389 }
390 opt = xchg(&np->opt, opt);
391 sk_dst_reset(sk);
392 } else {
393 write_lock(&sk->sk_dst_lock);
394 opt = xchg(&np->opt, opt);
395 write_unlock(&sk->sk_dst_lock);
396 sk_dst_reset(sk);
397 }
398
399 done:
400 if (opt)
401 sock_kfree_s(sk, opt, opt->tot_len);
402 break;
403 }
404 case IPV6_UNICAST_HOPS:
405 if (val > 255 || val < -1)
406 goto e_inval;
407 np->hop_limit = val;
408 retv = 0;
409 break;
410
411 case IPV6_MULTICAST_HOPS:
412 if (sk->sk_type == SOCK_STREAM)
413 goto e_inval;
414 if (val > 255 || val < -1)
415 goto e_inval;
416 np->mcast_hops = val;
417 retv = 0;
418 break;
419
420 case IPV6_MULTICAST_LOOP:
421 np->mc_loop = valbool;
422 retv = 0;
423 break;
424
425 case IPV6_MULTICAST_IF:
426 if (sk->sk_type == SOCK_STREAM)
427 goto e_inval;
428 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
429 goto e_inval;
430
431 if (__dev_get_by_index(val) == NULL) {
432 retv = -ENODEV;
433 break;
434 }
435 np->mcast_oif = val;
436 retv = 0;
437 break;
438 case IPV6_ADD_MEMBERSHIP:
439 case IPV6_DROP_MEMBERSHIP:
440 {
441 struct ipv6_mreq mreq;
442
443 retv = -EFAULT;
444 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
445 break;
446
447 if (optname == IPV6_ADD_MEMBERSHIP)
448 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
449 else
450 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
451 break;
452 }
453 case IPV6_JOIN_ANYCAST:
454 case IPV6_LEAVE_ANYCAST:
455 {
456 struct ipv6_mreq mreq;
457
458 if (optlen != sizeof(struct ipv6_mreq))
459 goto e_inval;
460
461 retv = -EFAULT;
462 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
463 break;
464
465 if (optname == IPV6_JOIN_ANYCAST)
466 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
467 else
468 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
469 break;
470 }
471 case MCAST_JOIN_GROUP:
472 case MCAST_LEAVE_GROUP:
473 {
474 struct group_req greq;
475 struct sockaddr_in6 *psin6;
476
477 retv = -EFAULT;
478 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
479 break;
480 if (greq.gr_group.ss_family != AF_INET6) {
481 retv = -EADDRNOTAVAIL;
482 break;
483 }
484 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
485 if (optname == MCAST_JOIN_GROUP)
486 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
487 &psin6->sin6_addr);
488 else
489 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
490 &psin6->sin6_addr);
491 break;
492 }
493 case MCAST_JOIN_SOURCE_GROUP:
494 case MCAST_LEAVE_SOURCE_GROUP:
495 case MCAST_BLOCK_SOURCE:
496 case MCAST_UNBLOCK_SOURCE:
497 {
498 struct group_source_req greqs;
499 int omode, add;
500
501 if (optlen != sizeof(struct group_source_req))
502 goto e_inval;
503 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
504 retv = -EFAULT;
505 break;
506 }
507 if (greqs.gsr_group.ss_family != AF_INET6 ||
508 greqs.gsr_source.ss_family != AF_INET6) {
509 retv = -EADDRNOTAVAIL;
510 break;
511 }
512 if (optname == MCAST_BLOCK_SOURCE) {
513 omode = MCAST_EXCLUDE;
514 add = 1;
515 } else if (optname == MCAST_UNBLOCK_SOURCE) {
516 omode = MCAST_EXCLUDE;
517 add = 0;
518 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
519 struct sockaddr_in6 *psin6;
520
521 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
522 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
523 &psin6->sin6_addr);
524 /* prior join w/ different source is ok */
525 if (retv && retv != -EADDRINUSE)
526 break;
527 omode = MCAST_INCLUDE;
528 add = 1;
529 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
530 omode = MCAST_INCLUDE;
531 add = 0;
532 }
533 retv = ip6_mc_source(add, omode, sk, &greqs);
534 break;
535 }
536 case MCAST_MSFILTER:
537 {
538 extern int sysctl_mld_max_msf;
539 struct group_filter *gsf;
540
541 if (optlen < GROUP_FILTER_SIZE(0))
542 goto e_inval;
543 if (optlen > sysctl_optmem_max) {
544 retv = -ENOBUFS;
545 break;
546 }
547 gsf = kmalloc(optlen,GFP_KERNEL);
548 if (gsf == 0) {
549 retv = -ENOBUFS;
550 break;
551 }
552 retv = -EFAULT;
553 if (copy_from_user(gsf, optval, optlen)) {
554 kfree(gsf);
555 break;
556 }
557 /* numsrc >= (4G-140)/128 overflow in 32 bits */
558 if (gsf->gf_numsrc >= 0x1ffffffU ||
559 gsf->gf_numsrc > sysctl_mld_max_msf) {
560 kfree(gsf);
561 retv = -ENOBUFS;
562 break;
563 }
564 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
565 kfree(gsf);
566 retv = -EINVAL;
567 break;
568 }
569 retv = ip6_mc_msfilter(sk, gsf);
570 kfree(gsf);
571
572 break;
573 }
574 case IPV6_ROUTER_ALERT:
575 retv = ip6_ra_control(sk, val, NULL);
576 break;
577 case IPV6_MTU_DISCOVER:
578 if (val<0 || val>2)
579 goto e_inval;
580 np->pmtudisc = val;
581 retv = 0;
582 break;
583 case IPV6_MTU:
584 if (val && val < IPV6_MIN_MTU)
585 goto e_inval;
586 np->frag_size = val;
587 retv = 0;
588 break;
589 case IPV6_RECVERR:
590 np->recverr = valbool;
591 if (!val)
592 skb_queue_purge(&sk->sk_error_queue);
593 retv = 0;
594 break;
595 case IPV6_FLOWINFO_SEND:
596 np->sndflow = valbool;
597 retv = 0;
598 break;
599 case IPV6_FLOWLABEL_MGR:
600 retv = ipv6_flowlabel_opt(sk, optval, optlen);
601 break;
602 case IPV6_IPSEC_POLICY:
603 case IPV6_XFRM_POLICY:
604 retv = -EPERM;
605 if (!capable(CAP_NET_ADMIN))
606 break;
607 retv = xfrm_user_policy(sk, optname, optval, optlen);
608 break;
609
610 }
611 release_sock(sk);
612
613 return retv;
614
615 e_inval:
616 release_sock(sk);
617 return -EINVAL;
618 }
619
620 int ipv6_setsockopt(struct sock *sk, int level, int optname,
621 char __user *optval, int optlen)
622 {
623 int err;
624
625 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
626 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
627
628 if (level != SOL_IPV6)
629 return -ENOPROTOOPT;
630
631 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
632 #ifdef CONFIG_NETFILTER
633 /* we need to exclude all possible ENOPROTOOPTs except default case */
634 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
635 optname != IPV6_XFRM_POLICY) {
636 lock_sock(sk);
637 err = nf_setsockopt(sk, PF_INET6, optname, optval,
638 optlen);
639 release_sock(sk);
640 }
641 #endif
642 return err;
643 }
644
645
646 #ifdef CONFIG_COMPAT
647 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
648 char __user *optval, int optlen)
649 {
650 int err;
651
652 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
653 if (udp_prot.compat_setsockopt != NULL)
654 return udp_prot.compat_setsockopt(sk, level, optname,
655 optval, optlen);
656 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
657 }
658
659 if (level != SOL_IPV6)
660 return -ENOPROTOOPT;
661
662 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
663 #ifdef CONFIG_NETFILTER
664 /* we need to exclude all possible ENOPROTOOPTs except default case */
665 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
666 optname != IPV6_XFRM_POLICY) {
667 lock_sock(sk);
668 err = compat_nf_setsockopt(sk, PF_INET6, optname,
669 optval, optlen);
670 release_sock(sk);
671 }
672 #endif
673 return err;
674 }
675
676 EXPORT_SYMBOL(compat_ipv6_setsockopt);
677 #endif
678
679 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
680 char __user *optval, int len)
681 {
682 if (!hdr)
683 return 0;
684 len = min_t(int, len, ipv6_optlen(hdr));
685 if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
686 return -EFAULT;
687 return len;
688 }
689
690 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
691 char __user *optval, int __user *optlen)
692 {
693 struct ipv6_pinfo *np = inet6_sk(sk);
694 int len;
695 int val;
696
697 if (get_user(len, optlen))
698 return -EFAULT;
699 switch (optname) {
700 case IPV6_ADDRFORM:
701 if (sk->sk_protocol != IPPROTO_UDP &&
702 sk->sk_protocol != IPPROTO_TCP)
703 return -EINVAL;
704 if (sk->sk_state != TCP_ESTABLISHED)
705 return -ENOTCONN;
706 val = sk->sk_family;
707 break;
708 case MCAST_MSFILTER:
709 {
710 struct group_filter gsf;
711 int err;
712
713 if (len < GROUP_FILTER_SIZE(0))
714 return -EINVAL;
715 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
716 return -EFAULT;
717 lock_sock(sk);
718 err = ip6_mc_msfget(sk, &gsf,
719 (struct group_filter __user *)optval, optlen);
720 release_sock(sk);
721 return err;
722 }
723
724 case IPV6_2292PKTOPTIONS:
725 {
726 struct msghdr msg;
727 struct sk_buff *skb;
728
729 if (sk->sk_type != SOCK_STREAM)
730 return -ENOPROTOOPT;
731
732 msg.msg_control = optval;
733 msg.msg_controllen = len;
734 msg.msg_flags = 0;
735
736 lock_sock(sk);
737 skb = np->pktoptions;
738 if (skb)
739 atomic_inc(&skb->users);
740 release_sock(sk);
741
742 if (skb) {
743 int err = datagram_recv_ctl(sk, &msg, skb);
744 kfree_skb(skb);
745 if (err)
746 return err;
747 } else {
748 if (np->rxopt.bits.rxinfo) {
749 struct in6_pktinfo src_info;
750 src_info.ipi6_ifindex = np->mcast_oif;
751 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
752 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
753 }
754 if (np->rxopt.bits.rxhlim) {
755 int hlim = np->mcast_hops;
756 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
757 }
758 if (np->rxopt.bits.rxoinfo) {
759 struct in6_pktinfo src_info;
760 src_info.ipi6_ifindex = np->mcast_oif;
761 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
762 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
763 }
764 if (np->rxopt.bits.rxohlim) {
765 int hlim = np->mcast_hops;
766 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
767 }
768 }
769 len -= msg.msg_controllen;
770 return put_user(len, optlen);
771 }
772 case IPV6_MTU:
773 {
774 struct dst_entry *dst;
775 val = 0;
776 lock_sock(sk);
777 dst = sk_dst_get(sk);
778 if (dst) {
779 val = dst_mtu(dst);
780 dst_release(dst);
781 }
782 release_sock(sk);
783 if (!val)
784 return -ENOTCONN;
785 break;
786 }
787
788 case IPV6_V6ONLY:
789 val = np->ipv6only;
790 break;
791
792 case IPV6_RECVPKTINFO:
793 val = np->rxopt.bits.rxinfo;
794 break;
795
796 case IPV6_2292PKTINFO:
797 val = np->rxopt.bits.rxoinfo;
798 break;
799
800 case IPV6_RECVHOPLIMIT:
801 val = np->rxopt.bits.rxhlim;
802 break;
803
804 case IPV6_2292HOPLIMIT:
805 val = np->rxopt.bits.rxohlim;
806 break;
807
808 case IPV6_RECVRTHDR:
809 val = np->rxopt.bits.srcrt;
810 break;
811
812 case IPV6_2292RTHDR:
813 val = np->rxopt.bits.osrcrt;
814 break;
815
816 case IPV6_HOPOPTS:
817 case IPV6_RTHDRDSTOPTS:
818 case IPV6_RTHDR:
819 case IPV6_DSTOPTS:
820 {
821
822 lock_sock(sk);
823 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
824 optval, len);
825 release_sock(sk);
826 return put_user(len, optlen);
827 }
828
829 case IPV6_RECVHOPOPTS:
830 val = np->rxopt.bits.hopopts;
831 break;
832
833 case IPV6_2292HOPOPTS:
834 val = np->rxopt.bits.ohopopts;
835 break;
836
837 case IPV6_RECVDSTOPTS:
838 val = np->rxopt.bits.dstopts;
839 break;
840
841 case IPV6_2292DSTOPTS:
842 val = np->rxopt.bits.odstopts;
843 break;
844
845 case IPV6_TCLASS:
846 val = np->tclass;
847 break;
848
849 case IPV6_RECVTCLASS:
850 val = np->rxopt.bits.rxtclass;
851 break;
852
853 case IPV6_FLOWINFO:
854 val = np->rxopt.bits.rxflow;
855 break;
856
857 case IPV6_UNICAST_HOPS:
858 val = np->hop_limit;
859 break;
860
861 case IPV6_MULTICAST_HOPS:
862 val = np->mcast_hops;
863 break;
864
865 case IPV6_MULTICAST_LOOP:
866 val = np->mc_loop;
867 break;
868
869 case IPV6_MULTICAST_IF:
870 val = np->mcast_oif;
871 break;
872
873 case IPV6_MTU_DISCOVER:
874 val = np->pmtudisc;
875 break;
876
877 case IPV6_RECVERR:
878 val = np->recverr;
879 break;
880
881 case IPV6_FLOWINFO_SEND:
882 val = np->sndflow;
883 break;
884
885 default:
886 return -EINVAL;
887 }
888 len = min_t(unsigned int, sizeof(int), len);
889 if(put_user(len, optlen))
890 return -EFAULT;
891 if(copy_to_user(optval,&val,len))
892 return -EFAULT;
893 return 0;
894 }
895
896 int ipv6_getsockopt(struct sock *sk, int level, int optname,
897 char __user *optval, int __user *optlen)
898 {
899 int err;
900
901 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
902 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
903
904 if(level != SOL_IPV6)
905 return -ENOPROTOOPT;
906
907 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
908 #ifdef CONFIG_NETFILTER
909 /* we need to exclude all possible EINVALs except default case */
910 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
911 optname != MCAST_MSFILTER) {
912 int len;
913
914 if (get_user(len, optlen))
915 return -EFAULT;
916
917 lock_sock(sk);
918 err = nf_getsockopt(sk, PF_INET6, optname, optval,
919 &len);
920 release_sock(sk);
921 if (err >= 0)
922 err = put_user(len, optlen);
923 }
924 #endif
925 return err;
926 }
927
928 #ifdef CONFIG_COMPAT
929 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
930 char __user *optval, int __user *optlen)
931 {
932 int err;
933
934 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
935 if (udp_prot.compat_getsockopt != NULL)
936 return udp_prot.compat_getsockopt(sk, level, optname,
937 optval, optlen);
938 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
939 }
940
941 if (level != SOL_IPV6)
942 return -ENOPROTOOPT;
943
944 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
945 #ifdef CONFIG_NETFILTER
946 /* we need to exclude all possible EINVALs except default case */
947 if (err == -EINVAL && optname != IPV6_ADDRFORM &&
948 optname != MCAST_MSFILTER) {
949 int len;
950
951 if (get_user(len, optlen))
952 return -EFAULT;
953
954 lock_sock(sk);
955 err = compat_nf_getsockopt(sk, PF_INET6,
956 optname, optval, &len);
957 release_sock(sk);
958 if (err >= 0)
959 err = put_user(len, optlen);
960 }
961 #endif
962 return err;
963 }
964
965 EXPORT_SYMBOL(compat_ipv6_getsockopt);
966 #endif
967
968 void __init ipv6_packet_init(void)
969 {
970 dev_add_pack(&ipv6_packet_type);
971 }
972
973 void ipv6_packet_cleanup(void)
974 {
975 dev_remove_pack(&ipv6_packet_type);
976 }
linux-next