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[UDP]: Revert udplite and code split.
[deliverable/linux.git] / net / ipv6 / ipv6_sockglue.c
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/errno.h>
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/init.h>
39 #include <linux/sysctl.h>
40 #include <linux/netfilter.h>
41
42 #include <net/sock.h>
43 #include <net/snmp.h>
44 #include <net/ipv6.h>
45 #include <net/ndisc.h>
46 #include <net/protocol.h>
47 #include <net/transp_v6.h>
48 #include <net/ip6_route.h>
49 #include <net/addrconf.h>
50 #include <net/inet_common.h>
51 #include <net/tcp.h>
52 #include <net/udp.h>
53 #include <net/udplite.h>
54 #include <net/xfrm.h>
55
56 #include <asm/uaccess.h>
57
58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
59
60 struct ip6_ra_chain *ip6_ra_chain;
61 DEFINE_RWLOCK(ip6_ra_lock);
62
63 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
64 {
65 struct ip6_ra_chain *ra, *new_ra, **rap;
66
67 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
68 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
69 return -EINVAL;
70
71 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
72
73 write_lock_bh(&ip6_ra_lock);
74 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
75 if (ra->sk == sk) {
76 if (sel>=0) {
77 write_unlock_bh(&ip6_ra_lock);
78 kfree(new_ra);
79 return -EADDRINUSE;
80 }
81
82 *rap = ra->next;
83 write_unlock_bh(&ip6_ra_lock);
84
85 if (ra->destructor)
86 ra->destructor(sk);
87 sock_put(sk);
88 kfree(ra);
89 return 0;
90 }
91 }
92 if (new_ra == NULL) {
93 write_unlock_bh(&ip6_ra_lock);
94 return -ENOBUFS;
95 }
96 new_ra->sk = sk;
97 new_ra->sel = sel;
98 new_ra->destructor = destructor;
99 new_ra->next = ra;
100 *rap = new_ra;
101 sock_hold(sk);
102 write_unlock_bh(&ip6_ra_lock);
103 return 0;
104 }
105
106 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
107 char __user *optval, int optlen)
108 {
109 struct ipv6_pinfo *np = inet6_sk(sk);
110 int val, valbool;
111 int retv = -ENOPROTOOPT;
112
113 if (optval == NULL)
114 val=0;
115 else if (get_user(val, (int __user *) optval))
116 return -EFAULT;
117
118 valbool = (val!=0);
119
120 lock_sock(sk);
121
122 switch (optname) {
123
124 case IPV6_ADDRFORM:
125 if (val == PF_INET) {
126 struct ipv6_txoptions *opt;
127 struct sk_buff *pktopt;
128
129 if (sk->sk_protocol != IPPROTO_UDP &&
130 sk->sk_protocol != IPPROTO_UDPLITE &&
131 sk->sk_protocol != IPPROTO_TCP)
132 break;
133
134 if (sk->sk_state != TCP_ESTABLISHED) {
135 retv = -ENOTCONN;
136 break;
137 }
138
139 if (ipv6_only_sock(sk) ||
140 !ipv6_addr_v4mapped(&np->daddr)) {
141 retv = -EADDRNOTAVAIL;
142 break;
143 }
144
145 fl6_free_socklist(sk);
146 ipv6_sock_mc_close(sk);
147
148 /*
149 * Sock is moving from IPv6 to IPv4 (sk_prot), so
150 * remove it from the refcnt debug socks count in the
151 * original family...
152 */
153 sk_refcnt_debug_dec(sk);
154
155 if (sk->sk_protocol == IPPROTO_TCP) {
156 struct inet_connection_sock *icsk = inet_csk(sk);
157
158 local_bh_disable();
159 sock_prot_inuse_add(sk->sk_prot, -1);
160 sock_prot_inuse_add(&tcp_prot, 1);
161 local_bh_enable();
162 sk->sk_prot = &tcp_prot;
163 icsk->icsk_af_ops = &ipv4_specific;
164 sk->sk_socket->ops = &inet_stream_ops;
165 sk->sk_family = PF_INET;
166 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
167 } else {
168 struct proto *prot = &udp_prot;
169
170 if (sk->sk_protocol == IPPROTO_UDPLITE)
171 prot = &udplite_prot;
172 local_bh_disable();
173 sock_prot_inuse_add(sk->sk_prot, -1);
174 sock_prot_inuse_add(prot, 1);
175 local_bh_enable();
176 sk->sk_prot = prot;
177 sk->sk_socket->ops = &inet_dgram_ops;
178 sk->sk_family = PF_INET;
179 }
180 opt = xchg(&np->opt, NULL);
181 if (opt)
182 sock_kfree_s(sk, opt, opt->tot_len);
183 pktopt = xchg(&np->pktoptions, NULL);
184 if (pktopt)
185 kfree_skb(pktopt);
186
187 sk->sk_destruct = inet_sock_destruct;
188 /*
189 * ... and add it to the refcnt debug socks count
190 * in the new family. -acme
191 */
192 sk_refcnt_debug_inc(sk);
193 module_put(THIS_MODULE);
194 retv = 0;
195 break;
196 }
197 goto e_inval;
198
199 case IPV6_V6ONLY:
200 if (inet_sk(sk)->num)
201 goto e_inval;
202 np->ipv6only = valbool;
203 retv = 0;
204 break;
205
206 case IPV6_RECVPKTINFO:
207 np->rxopt.bits.rxinfo = valbool;
208 retv = 0;
209 break;
210
211 case IPV6_2292PKTINFO:
212 np->rxopt.bits.rxoinfo = valbool;
213 retv = 0;
214 break;
215
216 case IPV6_RECVHOPLIMIT:
217 np->rxopt.bits.rxhlim = valbool;
218 retv = 0;
219 break;
220
221 case IPV6_2292HOPLIMIT:
222 np->rxopt.bits.rxohlim = valbool;
223 retv = 0;
224 break;
225
226 case IPV6_RECVRTHDR:
227 np->rxopt.bits.srcrt = valbool;
228 retv = 0;
229 break;
230
231 case IPV6_2292RTHDR:
232 np->rxopt.bits.osrcrt = valbool;
233 retv = 0;
234 break;
235
236 case IPV6_RECVHOPOPTS:
237 np->rxopt.bits.hopopts = valbool;
238 retv = 0;
239 break;
240
241 case IPV6_2292HOPOPTS:
242 np->rxopt.bits.ohopopts = valbool;
243 retv = 0;
244 break;
245
246 case IPV6_RECVDSTOPTS:
247 np->rxopt.bits.dstopts = valbool;
248 retv = 0;
249 break;
250
251 case IPV6_2292DSTOPTS:
252 np->rxopt.bits.odstopts = valbool;
253 retv = 0;
254 break;
255
256 case IPV6_TCLASS:
257 if (val < -1 || val > 0xff)
258 goto e_inval;
259 np->tclass = val;
260 retv = 0;
261 break;
262
263 case IPV6_RECVTCLASS:
264 np->rxopt.bits.rxtclass = valbool;
265 retv = 0;
266 break;
267
268 case IPV6_FLOWINFO:
269 np->rxopt.bits.rxflow = valbool;
270 retv = 0;
271 break;
272
273 case IPV6_HOPOPTS:
274 case IPV6_RTHDRDSTOPTS:
275 case IPV6_RTHDR:
276 case IPV6_DSTOPTS:
277 {
278 struct ipv6_txoptions *opt;
279 if (optlen == 0)
280 optval = NULL;
281
282 /* hop-by-hop / destination options are privileged option */
283 retv = -EPERM;
284 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
285 break;
286
287 retv = -EINVAL;
288 if (optlen & 0x7 || optlen > 8 * 255)
289 break;
290
291 opt = ipv6_renew_options(sk, np->opt, optname,
292 (struct ipv6_opt_hdr __user *)optval,
293 optlen);
294 if (IS_ERR(opt)) {
295 retv = PTR_ERR(opt);
296 break;
297 }
298
299 /* routing header option needs extra check */
300 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
301 struct ipv6_rt_hdr *rthdr = opt->srcrt;
302 switch (rthdr->type) {
303 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
304 case IPV6_SRCRT_TYPE_2:
305 break;
306 #endif
307 default:
308 goto sticky_done;
309 }
310
311 if ((rthdr->hdrlen & 1) ||
312 (rthdr->hdrlen >> 1) != rthdr->segments_left)
313 goto sticky_done;
314 }
315
316 retv = 0;
317 if (inet_sk(sk)->is_icsk) {
318 if (opt) {
319 struct inet_connection_sock *icsk = inet_csk(sk);
320 if (!((1 << sk->sk_state) &
321 (TCPF_LISTEN | TCPF_CLOSE))
322 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
323 icsk->icsk_ext_hdr_len =
324 opt->opt_flen + opt->opt_nflen;
325 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
326 }
327 }
328 opt = xchg(&np->opt, opt);
329 sk_dst_reset(sk);
330 } else {
331 write_lock(&sk->sk_dst_lock);
332 opt = xchg(&np->opt, opt);
333 write_unlock(&sk->sk_dst_lock);
334 sk_dst_reset(sk);
335 }
336 sticky_done:
337 if (opt)
338 sock_kfree_s(sk, opt, opt->tot_len);
339 break;
340 }
341
342 case IPV6_2292PKTOPTIONS:
343 {
344 struct ipv6_txoptions *opt = NULL;
345 struct msghdr msg;
346 struct flowi fl;
347 int junk;
348
349 fl.fl6_flowlabel = 0;
350 fl.oif = sk->sk_bound_dev_if;
351
352 if (optlen == 0)
353 goto update;
354
355 /* 1K is probably excessive
356 * 1K is surely not enough, 2K per standard header is 16K.
357 */
358 retv = -EINVAL;
359 if (optlen > 64*1024)
360 break;
361
362 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
363 retv = -ENOBUFS;
364 if (opt == NULL)
365 break;
366
367 memset(opt, 0, sizeof(*opt));
368 opt->tot_len = sizeof(*opt) + optlen;
369 retv = -EFAULT;
370 if (copy_from_user(opt+1, optval, optlen))
371 goto done;
372
373 msg.msg_controllen = optlen;
374 msg.msg_control = (void*)(opt+1);
375
376 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
377 if (retv)
378 goto done;
379 update:
380 retv = 0;
381 if (inet_sk(sk)->is_icsk) {
382 if (opt) {
383 struct inet_connection_sock *icsk = inet_csk(sk);
384 if (!((1 << sk->sk_state) &
385 (TCPF_LISTEN | TCPF_CLOSE))
386 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
387 icsk->icsk_ext_hdr_len =
388 opt->opt_flen + opt->opt_nflen;
389 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
390 }
391 }
392 opt = xchg(&np->opt, opt);
393 sk_dst_reset(sk);
394 } else {
395 write_lock(&sk->sk_dst_lock);
396 opt = xchg(&np->opt, opt);
397 write_unlock(&sk->sk_dst_lock);
398 sk_dst_reset(sk);
399 }
400
401 done:
402 if (opt)
403 sock_kfree_s(sk, opt, opt->tot_len);
404 break;
405 }
406 case IPV6_UNICAST_HOPS:
407 if (val > 255 || val < -1)
408 goto e_inval;
409 np->hop_limit = val;
410 retv = 0;
411 break;
412
413 case IPV6_MULTICAST_HOPS:
414 if (sk->sk_type == SOCK_STREAM)
415 goto e_inval;
416 if (val > 255 || val < -1)
417 goto e_inval;
418 np->mcast_hops = val;
419 retv = 0;
420 break;
421
422 case IPV6_MULTICAST_LOOP:
423 np->mc_loop = valbool;
424 retv = 0;
425 break;
426
427 case IPV6_MULTICAST_IF:
428 if (sk->sk_type == SOCK_STREAM)
429 goto e_inval;
430
431 if (val) {
432 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
433 goto e_inval;
434
435 if (__dev_get_by_index(&init_net, val) == NULL) {
436 retv = -ENODEV;
437 break;
438 }
439 }
440 np->mcast_oif = val;
441 retv = 0;
442 break;
443 case IPV6_ADD_MEMBERSHIP:
444 case IPV6_DROP_MEMBERSHIP:
445 {
446 struct ipv6_mreq mreq;
447
448 retv = -EPROTO;
449 if (inet_sk(sk)->is_icsk)
450 break;
451
452 retv = -EFAULT;
453 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
454 break;
455
456 if (optname == IPV6_ADD_MEMBERSHIP)
457 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
458 else
459 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
460 break;
461 }
462 case IPV6_JOIN_ANYCAST:
463 case IPV6_LEAVE_ANYCAST:
464 {
465 struct ipv6_mreq mreq;
466
467 if (optlen != sizeof(struct ipv6_mreq))
468 goto e_inval;
469
470 retv = -EFAULT;
471 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
472 break;
473
474 if (optname == IPV6_JOIN_ANYCAST)
475 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
476 else
477 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
478 break;
479 }
480 case MCAST_JOIN_GROUP:
481 case MCAST_LEAVE_GROUP:
482 {
483 struct group_req greq;
484 struct sockaddr_in6 *psin6;
485
486 retv = -EFAULT;
487 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
488 break;
489 if (greq.gr_group.ss_family != AF_INET6) {
490 retv = -EADDRNOTAVAIL;
491 break;
492 }
493 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
494 if (optname == MCAST_JOIN_GROUP)
495 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
496 &psin6->sin6_addr);
497 else
498 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
499 &psin6->sin6_addr);
500 break;
501 }
502 case MCAST_JOIN_SOURCE_GROUP:
503 case MCAST_LEAVE_SOURCE_GROUP:
504 case MCAST_BLOCK_SOURCE:
505 case MCAST_UNBLOCK_SOURCE:
506 {
507 struct group_source_req greqs;
508 int omode, add;
509
510 if (optlen != sizeof(struct group_source_req))
511 goto e_inval;
512 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
513 retv = -EFAULT;
514 break;
515 }
516 if (greqs.gsr_group.ss_family != AF_INET6 ||
517 greqs.gsr_source.ss_family != AF_INET6) {
518 retv = -EADDRNOTAVAIL;
519 break;
520 }
521 if (optname == MCAST_BLOCK_SOURCE) {
522 omode = MCAST_EXCLUDE;
523 add = 1;
524 } else if (optname == MCAST_UNBLOCK_SOURCE) {
525 omode = MCAST_EXCLUDE;
526 add = 0;
527 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
528 struct sockaddr_in6 *psin6;
529
530 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
531 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
532 &psin6->sin6_addr);
533 /* prior join w/ different source is ok */
534 if (retv && retv != -EADDRINUSE)
535 break;
536 omode = MCAST_INCLUDE;
537 add = 1;
538 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
539 omode = MCAST_INCLUDE;
540 add = 0;
541 }
542 retv = ip6_mc_source(add, omode, sk, &greqs);
543 break;
544 }
545 case MCAST_MSFILTER:
546 {
547 extern int sysctl_mld_max_msf;
548 struct group_filter *gsf;
549
550 if (optlen < GROUP_FILTER_SIZE(0))
551 goto e_inval;
552 if (optlen > sysctl_optmem_max) {
553 retv = -ENOBUFS;
554 break;
555 }
556 gsf = kmalloc(optlen,GFP_KERNEL);
557 if (!gsf) {
558 retv = -ENOBUFS;
559 break;
560 }
561 retv = -EFAULT;
562 if (copy_from_user(gsf, optval, optlen)) {
563 kfree(gsf);
564 break;
565 }
566 /* numsrc >= (4G-140)/128 overflow in 32 bits */
567 if (gsf->gf_numsrc >= 0x1ffffffU ||
568 gsf->gf_numsrc > sysctl_mld_max_msf) {
569 kfree(gsf);
570 retv = -ENOBUFS;
571 break;
572 }
573 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
574 kfree(gsf);
575 retv = -EINVAL;
576 break;
577 }
578 retv = ip6_mc_msfilter(sk, gsf);
579 kfree(gsf);
580
581 break;
582 }
583 case IPV6_ROUTER_ALERT:
584 retv = ip6_ra_control(sk, val, NULL);
585 break;
586 case IPV6_MTU_DISCOVER:
587 if (val<0 || val>3)
588 goto e_inval;
589 np->pmtudisc = val;
590 retv = 0;
591 break;
592 case IPV6_MTU:
593 if (val && val < IPV6_MIN_MTU)
594 goto e_inval;
595 np->frag_size = val;
596 retv = 0;
597 break;
598 case IPV6_RECVERR:
599 np->recverr = valbool;
600 if (!val)
601 skb_queue_purge(&sk->sk_error_queue);
602 retv = 0;
603 break;
604 case IPV6_FLOWINFO_SEND:
605 np->sndflow = valbool;
606 retv = 0;
607 break;
608 case IPV6_FLOWLABEL_MGR:
609 retv = ipv6_flowlabel_opt(sk, optval, optlen);
610 break;
611 case IPV6_IPSEC_POLICY:
612 case IPV6_XFRM_POLICY:
613 retv = -EPERM;
614 if (!capable(CAP_NET_ADMIN))
615 break;
616 retv = xfrm_user_policy(sk, optname, optval, optlen);
617 break;
618
619 }
620 release_sock(sk);
621
622 return retv;
623
624 e_inval:
625 release_sock(sk);
626 return -EINVAL;
627 }
628
629 int ipv6_setsockopt(struct sock *sk, int level, int optname,
630 char __user *optval, int optlen)
631 {
632 int err;
633
634 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
635 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
636
637 if (level != SOL_IPV6)
638 return -ENOPROTOOPT;
639
640 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
641 #ifdef CONFIG_NETFILTER
642 /* we need to exclude all possible ENOPROTOOPTs except default case */
643 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
644 optname != IPV6_XFRM_POLICY) {
645 lock_sock(sk);
646 err = nf_setsockopt(sk, PF_INET6, optname, optval,
647 optlen);
648 release_sock(sk);
649 }
650 #endif
651 return err;
652 }
653
654 EXPORT_SYMBOL(ipv6_setsockopt);
655
656 #ifdef CONFIG_COMPAT
657 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
658 char __user *optval, int optlen)
659 {
660 int err;
661
662 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
663 if (udp_prot.compat_setsockopt != NULL)
664 return udp_prot.compat_setsockopt(sk, level, optname,
665 optval, optlen);
666 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
667 }
668
669 if (level != SOL_IPV6)
670 return -ENOPROTOOPT;
671
672 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
673 #ifdef CONFIG_NETFILTER
674 /* we need to exclude all possible ENOPROTOOPTs except default case */
675 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
676 optname != IPV6_XFRM_POLICY) {
677 lock_sock(sk);
678 err = compat_nf_setsockopt(sk, PF_INET6, optname,
679 optval, optlen);
680 release_sock(sk);
681 }
682 #endif
683 return err;
684 }
685
686 EXPORT_SYMBOL(compat_ipv6_setsockopt);
687 #endif
688
689 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
690 int optname, char __user *optval, int len)
691 {
692 struct ipv6_opt_hdr *hdr;
693
694 if (!opt)
695 return 0;
696
697 switch(optname) {
698 case IPV6_HOPOPTS:
699 hdr = opt->hopopt;
700 break;
701 case IPV6_RTHDRDSTOPTS:
702 hdr = opt->dst0opt;
703 break;
704 case IPV6_RTHDR:
705 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
706 break;
707 case IPV6_DSTOPTS:
708 hdr = opt->dst1opt;
709 break;
710 default:
711 return -EINVAL; /* should not happen */
712 }
713
714 if (!hdr)
715 return 0;
716
717 len = min_t(unsigned int, len, ipv6_optlen(hdr));
718 if (copy_to_user(optval, hdr, len))
719 return -EFAULT;
720 return ipv6_optlen(hdr);
721 }
722
723 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
724 char __user *optval, int __user *optlen)
725 {
726 struct ipv6_pinfo *np = inet6_sk(sk);
727 int len;
728 int val;
729
730 if (get_user(len, optlen))
731 return -EFAULT;
732 switch (optname) {
733 case IPV6_ADDRFORM:
734 if (sk->sk_protocol != IPPROTO_UDP &&
735 sk->sk_protocol != IPPROTO_UDPLITE &&
736 sk->sk_protocol != IPPROTO_TCP)
737 return -EINVAL;
738 if (sk->sk_state != TCP_ESTABLISHED)
739 return -ENOTCONN;
740 val = sk->sk_family;
741 break;
742 case MCAST_MSFILTER:
743 {
744 struct group_filter gsf;
745 int err;
746
747 if (len < GROUP_FILTER_SIZE(0))
748 return -EINVAL;
749 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
750 return -EFAULT;
751 lock_sock(sk);
752 err = ip6_mc_msfget(sk, &gsf,
753 (struct group_filter __user *)optval, optlen);
754 release_sock(sk);
755 return err;
756 }
757
758 case IPV6_2292PKTOPTIONS:
759 {
760 struct msghdr msg;
761 struct sk_buff *skb;
762
763 if (sk->sk_type != SOCK_STREAM)
764 return -ENOPROTOOPT;
765
766 msg.msg_control = optval;
767 msg.msg_controllen = len;
768 msg.msg_flags = 0;
769
770 lock_sock(sk);
771 skb = np->pktoptions;
772 if (skb)
773 atomic_inc(&skb->users);
774 release_sock(sk);
775
776 if (skb) {
777 int err = datagram_recv_ctl(sk, &msg, skb);
778 kfree_skb(skb);
779 if (err)
780 return err;
781 } else {
782 if (np->rxopt.bits.rxinfo) {
783 struct in6_pktinfo src_info;
784 src_info.ipi6_ifindex = np->mcast_oif;
785 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
786 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
787 }
788 if (np->rxopt.bits.rxhlim) {
789 int hlim = np->mcast_hops;
790 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
791 }
792 if (np->rxopt.bits.rxoinfo) {
793 struct in6_pktinfo src_info;
794 src_info.ipi6_ifindex = np->mcast_oif;
795 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
796 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
797 }
798 if (np->rxopt.bits.rxohlim) {
799 int hlim = np->mcast_hops;
800 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
801 }
802 }
803 len -= msg.msg_controllen;
804 return put_user(len, optlen);
805 }
806 case IPV6_MTU:
807 {
808 struct dst_entry *dst;
809 val = 0;
810 lock_sock(sk);
811 dst = sk_dst_get(sk);
812 if (dst) {
813 val = dst_mtu(dst);
814 dst_release(dst);
815 }
816 release_sock(sk);
817 if (!val)
818 return -ENOTCONN;
819 break;
820 }
821
822 case IPV6_V6ONLY:
823 val = np->ipv6only;
824 break;
825
826 case IPV6_RECVPKTINFO:
827 val = np->rxopt.bits.rxinfo;
828 break;
829
830 case IPV6_2292PKTINFO:
831 val = np->rxopt.bits.rxoinfo;
832 break;
833
834 case IPV6_RECVHOPLIMIT:
835 val = np->rxopt.bits.rxhlim;
836 break;
837
838 case IPV6_2292HOPLIMIT:
839 val = np->rxopt.bits.rxohlim;
840 break;
841
842 case IPV6_RECVRTHDR:
843 val = np->rxopt.bits.srcrt;
844 break;
845
846 case IPV6_2292RTHDR:
847 val = np->rxopt.bits.osrcrt;
848 break;
849
850 case IPV6_HOPOPTS:
851 case IPV6_RTHDRDSTOPTS:
852 case IPV6_RTHDR:
853 case IPV6_DSTOPTS:
854 {
855
856 lock_sock(sk);
857 len = ipv6_getsockopt_sticky(sk, np->opt,
858 optname, optval, len);
859 release_sock(sk);
860 return put_user(len, optlen);
861 }
862
863 case IPV6_RECVHOPOPTS:
864 val = np->rxopt.bits.hopopts;
865 break;
866
867 case IPV6_2292HOPOPTS:
868 val = np->rxopt.bits.ohopopts;
869 break;
870
871 case IPV6_RECVDSTOPTS:
872 val = np->rxopt.bits.dstopts;
873 break;
874
875 case IPV6_2292DSTOPTS:
876 val = np->rxopt.bits.odstopts;
877 break;
878
879 case IPV6_TCLASS:
880 val = np->tclass;
881 if (val < 0)
882 val = 0;
883 break;
884
885 case IPV6_RECVTCLASS:
886 val = np->rxopt.bits.rxtclass;
887 break;
888
889 case IPV6_FLOWINFO:
890 val = np->rxopt.bits.rxflow;
891 break;
892
893 case IPV6_UNICAST_HOPS:
894 case IPV6_MULTICAST_HOPS:
895 {
896 struct dst_entry *dst;
897
898 if (optname == IPV6_UNICAST_HOPS)
899 val = np->hop_limit;
900 else
901 val = np->mcast_hops;
902
903 dst = sk_dst_get(sk);
904 if (dst) {
905 if (val < 0)
906 val = dst_metric(dst, RTAX_HOPLIMIT);
907 if (val < 0)
908 val = ipv6_get_hoplimit(dst->dev);
909 dst_release(dst);
910 }
911 if (val < 0)
912 val = ipv6_devconf.hop_limit;
913 break;
914 }
915
916 case IPV6_MULTICAST_LOOP:
917 val = np->mc_loop;
918 break;
919
920 case IPV6_MULTICAST_IF:
921 val = np->mcast_oif;
922 break;
923
924 case IPV6_MTU_DISCOVER:
925 val = np->pmtudisc;
926 break;
927
928 case IPV6_RECVERR:
929 val = np->recverr;
930 break;
931
932 case IPV6_FLOWINFO_SEND:
933 val = np->sndflow;
934 break;
935
936 default:
937 return -ENOPROTOOPT;
938 }
939 len = min_t(unsigned int, sizeof(int), len);
940 if(put_user(len, optlen))
941 return -EFAULT;
942 if(copy_to_user(optval,&val,len))
943 return -EFAULT;
944 return 0;
945 }
946
947 int ipv6_getsockopt(struct sock *sk, int level, int optname,
948 char __user *optval, int __user *optlen)
949 {
950 int err;
951
952 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
953 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
954
955 if(level != SOL_IPV6)
956 return -ENOPROTOOPT;
957
958 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
959 #ifdef CONFIG_NETFILTER
960 /* we need to exclude all possible ENOPROTOOPTs except default case */
961 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
962 int len;
963
964 if (get_user(len, optlen))
965 return -EFAULT;
966
967 lock_sock(sk);
968 err = nf_getsockopt(sk, PF_INET6, optname, optval,
969 &len);
970 release_sock(sk);
971 if (err >= 0)
972 err = put_user(len, optlen);
973 }
974 #endif
975 return err;
976 }
977
978 EXPORT_SYMBOL(ipv6_getsockopt);
979
980 #ifdef CONFIG_COMPAT
981 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
982 char __user *optval, int __user *optlen)
983 {
984 int err;
985
986 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
987 if (udp_prot.compat_getsockopt != NULL)
988 return udp_prot.compat_getsockopt(sk, level, optname,
989 optval, optlen);
990 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
991 }
992
993 if (level != SOL_IPV6)
994 return -ENOPROTOOPT;
995
996 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
997 #ifdef CONFIG_NETFILTER
998 /* we need to exclude all possible ENOPROTOOPTs except default case */
999 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1000 int len;
1001
1002 if (get_user(len, optlen))
1003 return -EFAULT;
1004
1005 lock_sock(sk);
1006 err = compat_nf_getsockopt(sk, PF_INET6,
1007 optname, optval, &len);
1008 release_sock(sk);
1009 if (err >= 0)
1010 err = put_user(len, optlen);
1011 }
1012 #endif
1013 return err;
1014 }
1015
1016 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1017 #endif
1018
Linux kernel - Deliverables
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