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[PATCH] g_file_storage: fix obscure race condition
[linux/fpc-iii.git] / net / ipv6 / ipv6_sockglue.c
blob8567873d0dd85fabd972537eccce7d79d8107611
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/config.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/sockios.h>
34 #include <linux/sched.h>
35 #include <linux/net.h>
36 #include <linux/in6.h>
37 #include <linux/netdevice.h>
38 #include <linux/if_arp.h>
39 #include <linux/init.h>
40 #include <linux/sysctl.h>
41 #include <linux/netfilter.h>
42
43 #include <net/sock.h>
44 #include <net/snmp.h>
45 #include <net/ipv6.h>
46 #include <net/ndisc.h>
47 #include <net/protocol.h>
48 #include <net/transp_v6.h>
49 #include <net/ip6_route.h>
50 #include <net/addrconf.h>
51 #include <net/inet_common.h>
52 #include <net/tcp.h>
53 #include <net/udp.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 static struct packet_type ipv6_packet_type = {
61 .type = __constant_htons(ETH_P_IPV6),
62 .func = ipv6_rcv,
63 };
64
65 struct ip6_ra_chain *ip6_ra_chain;
66 DEFINE_RWLOCK(ip6_ra_lock);
67
68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
69 {
70 struct ip6_ra_chain *ra, *new_ra, **rap;
71
72 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
73 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
74 return -EINVAL;
75
76 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
77
78 write_lock_bh(&ip6_ra_lock);
79 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
80 if (ra->sk == sk) {
81 if (sel>=0) {
82 write_unlock_bh(&ip6_ra_lock);
83 if (new_ra)
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 int 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 (level == SOL_IP && sk->sk_type != SOCK_RAW)
120 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
121
122 if(level!=SOL_IPV6)
123 goto out;
124
125 if (optval == NULL)
126 val=0;
127 else if (get_user(val, (int __user *) optval))
128 return -EFAULT;
129
130 valbool = (val!=0);
131
132 lock_sock(sk);
133
134 switch (optname) {
135
136 case IPV6_ADDRFORM:
137 if (val == PF_INET) {
138 struct ipv6_txoptions *opt;
139 struct sk_buff *pktopt;
140
141 if (sk->sk_protocol != IPPROTO_UDP &&
142 sk->sk_protocol != IPPROTO_TCP)
143 break;
144
145 if (sk->sk_state != TCP_ESTABLISHED) {
146 retv = -ENOTCONN;
147 break;
148 }
149
150 if (ipv6_only_sock(sk) ||
151 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
152 retv = -EADDRNOTAVAIL;
153 break;
154 }
155
156 fl6_free_socklist(sk);
157 ipv6_sock_mc_close(sk);
158
159 /*
160 * Sock is moving from IPv6 to IPv4 (sk_prot), so
161 * remove it from the refcnt debug socks count in the
162 * original family...
163 */
164 sk_refcnt_debug_dec(sk);
165
166 if (sk->sk_protocol == IPPROTO_TCP) {
167 struct tcp_sock *tp = tcp_sk(sk);
168
169 local_bh_disable();
170 sock_prot_dec_use(sk->sk_prot);
171 sock_prot_inc_use(&tcp_prot);
172 local_bh_enable();
173 sk->sk_prot = &tcp_prot;
174 tp->af_specific = &ipv4_specific;
175 sk->sk_socket->ops = &inet_stream_ops;
176 sk->sk_family = PF_INET;
177 tcp_sync_mss(sk, tp->pmtu_cookie);
178 } else {
179 local_bh_disable();
180 sock_prot_dec_use(sk->sk_prot);
181 sock_prot_inc_use(&udp_prot);
182 local_bh_enable();
183 sk->sk_prot = &udp_prot;
184 sk->sk_socket->ops = &inet_dgram_ops;
185 sk->sk_family = PF_INET;
186 }
187 opt = xchg(&np->opt, NULL);
188 if (opt)
189 sock_kfree_s(sk, opt, opt->tot_len);
190 pktopt = xchg(&np->pktoptions, NULL);
191 if (pktopt)
192 kfree_skb(pktopt);
193
194 sk->sk_destruct = inet_sock_destruct;
195 /*
196 * ... and add it to the refcnt debug socks count
197 * in the new family. -acme
198 */
199 sk_refcnt_debug_inc(sk);
200 module_put(THIS_MODULE);
201 retv = 0;
202 break;
203 }
204 goto e_inval;
205
206 case IPV6_V6ONLY:
207 if (inet_sk(sk)->num)
208 goto e_inval;
209 np->ipv6only = valbool;
210 retv = 0;
211 break;
212
213 case IPV6_RECVPKTINFO:
214 np->rxopt.bits.rxinfo = valbool;
215 retv = 0;
216 break;
217
218 case IPV6_2292PKTINFO:
219 np->rxopt.bits.rxoinfo = valbool;
220 retv = 0;
221 break;
222
223 case IPV6_RECVHOPLIMIT:
224 np->rxopt.bits.rxhlim = valbool;
225 retv = 0;
226 break;
227
228 case IPV6_2292HOPLIMIT:
229 np->rxopt.bits.rxohlim = valbool;
230 retv = 0;
231 break;
232
233 case IPV6_RECVRTHDR:
234 if (val < 0 || val > 2)
235 goto e_inval;
236 np->rxopt.bits.srcrt = val;
237 retv = 0;
238 break;
239
240 case IPV6_2292RTHDR:
241 if (val < 0 || val > 2)
242 goto e_inval;
243 np->rxopt.bits.osrcrt = val;
244 retv = 0;
245 break;
246
247 case IPV6_RECVHOPOPTS:
248 np->rxopt.bits.hopopts = valbool;
249 retv = 0;
250 break;
251
252 case IPV6_2292HOPOPTS:
253 np->rxopt.bits.ohopopts = valbool;
254 retv = 0;
255 break;
256
257 case IPV6_RECVDSTOPTS:
258 np->rxopt.bits.dstopts = valbool;
259 retv = 0;
260 break;
261
262 case IPV6_2292DSTOPTS:
263 np->rxopt.bits.odstopts = valbool;
264 retv = 0;
265 break;
266
267 case IPV6_TCLASS:
268 if (val < 0 || val > 0xff)
269 goto e_inval;
270 np->tclass = val;
271 retv = 0;
272 break;
273
274 case IPV6_RECVTCLASS:
275 np->rxopt.bits.rxtclass = valbool;
276 retv = 0;
277 break;
278
279 case IPV6_FLOWINFO:
280 np->rxopt.bits.rxflow = valbool;
281 retv = 0;
282 break;
283
284 case IPV6_HOPOPTS:
285 case IPV6_RTHDRDSTOPTS:
286 case IPV6_RTHDR:
287 case IPV6_DSTOPTS:
288 {
289 struct ipv6_txoptions *opt;
290 if (optlen == 0)
291 optval = 0;
292
293 /* hop-by-hop / destination options are privileged option */
294 retv = -EPERM;
295 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
296 break;
297
298 retv = -EINVAL;
299 if (optlen & 0x7 || optlen > 8 * 255)
300 break;
301
302 opt = ipv6_renew_options(sk, np->opt, optname,
303 (struct ipv6_opt_hdr __user *)optval,
304 optlen);
305 if (IS_ERR(opt)) {
306 retv = PTR_ERR(opt);
307 break;
308 }
309
310 /* routing header option needs extra check */
311 if (optname == IPV6_RTHDR && opt->srcrt) {
312 struct ipv6_rt_hdr *rthdr = opt->srcrt;
313 if (rthdr->type)
314 goto sticky_done;
315 if ((rthdr->hdrlen & 1) ||
316 (rthdr->hdrlen >> 1) != rthdr->segments_left)
317 goto sticky_done;
318 }
319
320 retv = 0;
321 if (sk->sk_type == SOCK_STREAM) {
322 if (opt) {
323 struct tcp_sock *tp = tcp_sk(sk);
324 if (!((1 << sk->sk_state) &
325 (TCPF_LISTEN | TCPF_CLOSE))
326 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
327 tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
328 tcp_sync_mss(sk, tp->pmtu_cookie);
329 }
330 }
331 opt = xchg(&np->opt, opt);
332 sk_dst_reset(sk);
333 } else {
334 write_lock(&sk->sk_dst_lock);
335 opt = xchg(&np->opt, opt);
336 write_unlock(&sk->sk_dst_lock);
337 sk_dst_reset(sk);
338 }
339 sticky_done:
340 if (opt)
341 sock_kfree_s(sk, opt, opt->tot_len);
342 break;
343 }
344
345 case IPV6_2292PKTOPTIONS:
346 {
347 struct ipv6_txoptions *opt = NULL;
348 struct msghdr msg;
349 struct flowi fl;
350 int junk;
351
352 fl.fl6_flowlabel = 0;
353 fl.oif = sk->sk_bound_dev_if;
354
355 if (optlen == 0)
356 goto update;
357
358 /* 1K is probably excessive
359 * 1K is surely not enough, 2K per standard header is 16K.
360 */
361 retv = -EINVAL;
362 if (optlen > 64*1024)
363 break;
364
365 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
366 retv = -ENOBUFS;
367 if (opt == NULL)
368 break;
369
370 memset(opt, 0, sizeof(*opt));
371 opt->tot_len = sizeof(*opt) + optlen;
372 retv = -EFAULT;
373 if (copy_from_user(opt+1, optval, optlen))
374 goto done;
375
376 msg.msg_controllen = optlen;
377 msg.msg_control = (void*)(opt+1);
378
379 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
380 if (retv)
381 goto done;
382 update:
383 retv = 0;
384 if (sk->sk_type == SOCK_STREAM) {
385 if (opt) {
386 struct tcp_sock *tp = tcp_sk(sk);
387 if (!((1 << sk->sk_state) &
388 (TCPF_LISTEN | TCPF_CLOSE))
389 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
390 tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
391 tcp_sync_mss(sk, tp->pmtu_cookie);
392 }
393 }
394 opt = xchg(&np->opt, opt);
395 sk_dst_reset(sk);
396 } else {
397 write_lock(&sk->sk_dst_lock);
398 opt = xchg(&np->opt, opt);
399 write_unlock(&sk->sk_dst_lock);
400 sk_dst_reset(sk);
401 }
402
403 done:
404 if (opt)
405 sock_kfree_s(sk, opt, opt->tot_len);
406 break;
407 }
408 case IPV6_UNICAST_HOPS:
409 if (val > 255 || val < -1)
410 goto e_inval;
411 np->hop_limit = val;
412 retv = 0;
413 break;
414
415 case IPV6_MULTICAST_HOPS:
416 if (sk->sk_type == SOCK_STREAM)
417 goto e_inval;
418 if (val > 255 || val < -1)
419 goto e_inval;
420 np->mcast_hops = val;
421 retv = 0;
422 break;
423
424 case IPV6_MULTICAST_LOOP:
425 np->mc_loop = valbool;
426 retv = 0;
427 break;
428
429 case IPV6_MULTICAST_IF:
430 if (sk->sk_type == SOCK_STREAM)
431 goto e_inval;
432 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
433 goto e_inval;
434
435 if (__dev_get_by_index(val) == NULL) {
436 retv = -ENODEV;
437 break;
438 }
439 np->mcast_oif = val;
440 retv = 0;
441 break;
442 case IPV6_ADD_MEMBERSHIP:
443 case IPV6_DROP_MEMBERSHIP:
444 {
445 struct ipv6_mreq mreq;
446
447 retv = -EFAULT;
448 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
449 break;
450
451 if (optname == IPV6_ADD_MEMBERSHIP)
452 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
453 else
454 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
455 break;
456 }
457 case IPV6_JOIN_ANYCAST:
458 case IPV6_LEAVE_ANYCAST:
459 {
460 struct ipv6_mreq mreq;
461
462 if (optlen != sizeof(struct ipv6_mreq))
463 goto e_inval;
464
465 retv = -EFAULT;
466 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
467 break;
468
469 if (optname == IPV6_JOIN_ANYCAST)
470 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
471 else
472 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
473 break;
474 }
475 case MCAST_JOIN_GROUP:
476 case MCAST_LEAVE_GROUP:
477 {
478 struct group_req greq;
479 struct sockaddr_in6 *psin6;
480
481 retv = -EFAULT;
482 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
483 break;
484 if (greq.gr_group.ss_family != AF_INET6) {
485 retv = -EADDRNOTAVAIL;
486 break;
487 }
488 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
489 if (optname == MCAST_JOIN_GROUP)
490 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
491 &psin6->sin6_addr);
492 else
493 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
494 &psin6->sin6_addr);
495 break;
496 }
497 case MCAST_JOIN_SOURCE_GROUP:
498 case MCAST_LEAVE_SOURCE_GROUP:
499 case MCAST_BLOCK_SOURCE:
500 case MCAST_UNBLOCK_SOURCE:
501 {
502 struct group_source_req greqs;
503 int omode, add;
504
505 if (optlen != sizeof(struct group_source_req))
506 goto e_inval;
507 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
508 retv = -EFAULT;
509 break;
510 }
511 if (greqs.gsr_group.ss_family != AF_INET6 ||
512 greqs.gsr_source.ss_family != AF_INET6) {
513 retv = -EADDRNOTAVAIL;
514 break;
515 }
516 if (optname == MCAST_BLOCK_SOURCE) {
517 omode = MCAST_EXCLUDE;
518 add = 1;
519 } else if (optname == MCAST_UNBLOCK_SOURCE) {
520 omode = MCAST_EXCLUDE;
521 add = 0;
522 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
523 struct sockaddr_in6 *psin6;
524
525 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
526 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
527 &psin6->sin6_addr);
528 /* prior join w/ different source is ok */
529 if (retv && retv != -EADDRINUSE)
530 break;
531 omode = MCAST_INCLUDE;
532 add = 1;
533 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
534 omode = MCAST_INCLUDE;
535 add = 0;
536 }
537 retv = ip6_mc_source(add, omode, sk, &greqs);
538 break;
539 }
540 case MCAST_MSFILTER:
541 {
542 extern int sysctl_mld_max_msf;
543 struct group_filter *gsf;
544
545 if (optlen < GROUP_FILTER_SIZE(0))
546 goto e_inval;
547 if (optlen > sysctl_optmem_max) {
548 retv = -ENOBUFS;
549 break;
550 }
551 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
552 if (gsf == 0) {
553 retv = -ENOBUFS;
554 break;
555 }
556 retv = -EFAULT;
557 if (copy_from_user(gsf, optval, optlen)) {
558 kfree(gsf);
559 break;
560 }
561 /* numsrc >= (4G-140)/128 overflow in 32 bits */
562 if (gsf->gf_numsrc >= 0x1ffffffU ||
563 gsf->gf_numsrc > sysctl_mld_max_msf) {
564 kfree(gsf);
565 retv = -ENOBUFS;
566 break;
567 }
568 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
569 kfree(gsf);
570 retv = -EINVAL;
571 break;
572 }
573 retv = ip6_mc_msfilter(sk, gsf);
574 kfree(gsf);
575
576 break;
577 }
578 case IPV6_ROUTER_ALERT:
579 retv = ip6_ra_control(sk, val, NULL);
580 break;
581 case IPV6_MTU_DISCOVER:
582 if (val<0 || val>2)
583 goto e_inval;
584 np->pmtudisc = val;
585 retv = 0;
586 break;
587 case IPV6_MTU:
588 if (val && val < IPV6_MIN_MTU)
589 goto e_inval;
590 np->frag_size = val;
591 retv = 0;
592 break;
593 case IPV6_RECVERR:
594 np->recverr = valbool;
595 if (!val)
596 skb_queue_purge(&sk->sk_error_queue);
597 retv = 0;
598 break;
599 case IPV6_FLOWINFO_SEND:
600 np->sndflow = valbool;
601 retv = 0;
602 break;
603 case IPV6_FLOWLABEL_MGR:
604 retv = ipv6_flowlabel_opt(sk, optval, optlen);
605 break;
606 case IPV6_IPSEC_POLICY:
607 case IPV6_XFRM_POLICY:
608 retv = -EPERM;
609 if (!capable(CAP_NET_ADMIN))
610 break;
611 retv = xfrm_user_policy(sk, optname, optval, optlen);
612 break;
613
614 #ifdef CONFIG_NETFILTER
615 default:
616 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
617 optlen);
618 break;
619 #endif
620
621 }
622 release_sock(sk);
623
624 out:
625 return retv;
626
627 e_inval:
628 release_sock(sk);
629 return -EINVAL;
630 }
631
632 int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
633 char __user *optval, int len)
634 {
635 if (!hdr)
636 return 0;
637 len = min_t(int, len, ipv6_optlen(hdr));
638 if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
639 return -EFAULT;
640 return len;
641 }
642
643 int ipv6_getsockopt(struct sock *sk, int level, int optname,
644 char __user *optval, int __user *optlen)
645 {
646 struct ipv6_pinfo *np = inet6_sk(sk);
647 int len;
648 int val;
649
650 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
651 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
652 if(level!=SOL_IPV6)
653 return -ENOPROTOOPT;
654 if (get_user(len, optlen))
655 return -EFAULT;
656 switch (optname) {
657 case IPV6_ADDRFORM:
658 if (sk->sk_protocol != IPPROTO_UDP &&
659 sk->sk_protocol != IPPROTO_TCP)
660 return -EINVAL;
661 if (sk->sk_state != TCP_ESTABLISHED)
662 return -ENOTCONN;
663 val = sk->sk_family;
664 break;
665 case MCAST_MSFILTER:
666 {
667 struct group_filter gsf;
668 int err;
669
670 if (len < GROUP_FILTER_SIZE(0))
671 return -EINVAL;
672 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
673 return -EFAULT;
674 lock_sock(sk);
675 err = ip6_mc_msfget(sk, &gsf,
676 (struct group_filter __user *)optval, optlen);
677 release_sock(sk);
678 return err;
679 }
680
681 case IPV6_2292PKTOPTIONS:
682 {
683 struct msghdr msg;
684 struct sk_buff *skb;
685
686 if (sk->sk_type != SOCK_STREAM)
687 return -ENOPROTOOPT;
688
689 msg.msg_control = optval;
690 msg.msg_controllen = len;
691 msg.msg_flags = 0;
692
693 lock_sock(sk);
694 skb = np->pktoptions;
695 if (skb)
696 atomic_inc(&skb->users);
697 release_sock(sk);
698
699 if (skb) {
700 int err = datagram_recv_ctl(sk, &msg, skb);
701 kfree_skb(skb);
702 if (err)
703 return err;
704 } else {
705 if (np->rxopt.bits.rxinfo) {
706 struct in6_pktinfo src_info;
707 src_info.ipi6_ifindex = np->mcast_oif;
708 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
709 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
710 }
711 if (np->rxopt.bits.rxhlim) {
712 int hlim = np->mcast_hops;
713 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
714 }
715 if (np->rxopt.bits.rxoinfo) {
716 struct in6_pktinfo src_info;
717 src_info.ipi6_ifindex = np->mcast_oif;
718 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
719 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
720 }
721 if (np->rxopt.bits.rxohlim) {
722 int hlim = np->mcast_hops;
723 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
724 }
725 }
726 len -= msg.msg_controllen;
727 return put_user(len, optlen);
728 }
729 case IPV6_MTU:
730 {
731 struct dst_entry *dst;
732 val = 0;
733 lock_sock(sk);
734 dst = sk_dst_get(sk);
735 if (dst) {
736 val = dst_mtu(dst);
737 dst_release(dst);
738 }
739 release_sock(sk);
740 if (!val)
741 return -ENOTCONN;
742 break;
743 }
744
745 case IPV6_V6ONLY:
746 val = np->ipv6only;
747 break;
748
749 case IPV6_RECVPKTINFO:
750 val = np->rxopt.bits.rxinfo;
751 break;
752
753 case IPV6_2292PKTINFO:
754 val = np->rxopt.bits.rxoinfo;
755 break;
756
757 case IPV6_RECVHOPLIMIT:
758 val = np->rxopt.bits.rxhlim;
759 break;
760
761 case IPV6_2292HOPLIMIT:
762 val = np->rxopt.bits.rxohlim;
763 break;
764
765 case IPV6_RECVRTHDR:
766 val = np->rxopt.bits.srcrt;
767 break;
768
769 case IPV6_2292RTHDR:
770 val = np->rxopt.bits.osrcrt;
771 break;
772
773 case IPV6_HOPOPTS:
774 case IPV6_RTHDRDSTOPTS:
775 case IPV6_RTHDR:
776 case IPV6_DSTOPTS:
777 {
778
779 lock_sock(sk);
780 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
781 optval, len);
782 release_sock(sk);
783 return put_user(len, optlen);
784 }
785
786 case IPV6_RECVHOPOPTS:
787 val = np->rxopt.bits.hopopts;
788 break;
789
790 case IPV6_2292HOPOPTS:
791 val = np->rxopt.bits.ohopopts;
792 break;
793
794 case IPV6_RECVDSTOPTS:
795 val = np->rxopt.bits.dstopts;
796 break;
797
798 case IPV6_2292DSTOPTS:
799 val = np->rxopt.bits.odstopts;
800 break;
801
802 case IPV6_TCLASS:
803 val = np->tclass;
804 break;
805
806 case IPV6_RECVTCLASS:
807 val = np->rxopt.bits.rxtclass;
808 break;
809
810 case IPV6_FLOWINFO:
811 val = np->rxopt.bits.rxflow;
812 break;
813
814 case IPV6_UNICAST_HOPS:
815 val = np->hop_limit;
816 break;
817
818 case IPV6_MULTICAST_HOPS:
819 val = np->mcast_hops;
820 break;
821
822 case IPV6_MULTICAST_LOOP:
823 val = np->mc_loop;
824 break;
825
826 case IPV6_MULTICAST_IF:
827 val = np->mcast_oif;
828 break;
829
830 case IPV6_MTU_DISCOVER:
831 val = np->pmtudisc;
832 break;
833
834 case IPV6_RECVERR:
835 val = np->recverr;
836 break;
837
838 case IPV6_FLOWINFO_SEND:
839 val = np->sndflow;
840 break;
841
842 default:
843 #ifdef CONFIG_NETFILTER
844 lock_sock(sk);
845 val = nf_getsockopt(sk, PF_INET6, optname, optval,
846 &len);
847 release_sock(sk);
848 if (val >= 0)
849 val = put_user(len, optlen);
850 return val;
851 #else
852 return -EINVAL;
853 #endif
854 }
855 len = min_t(unsigned int, sizeof(int), len);
856 if(put_user(len, optlen))
857 return -EFAULT;
858 if(copy_to_user(optval,&val,len))
859 return -EFAULT;
860 return 0;
861 }
862
863 void __init ipv6_packet_init(void)
864 {
865 dev_add_pack(&ipv6_packet_type);
866 }
867
868 void ipv6_packet_cleanup(void)
869 {
870 dev_remove_pack(&ipv6_packet_type);
871 }
Linux with added FPC-III support