projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[NET]: Cleanup INET_REFCNT_DEBUG code
[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/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);
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 extern int ip6_mc_source(int add, int omode, struct sock *sk,
113 struct group_source_req *pgsr);
114 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
115 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
116 struct group_filter __user *optval, int __user *optlen);
117
118
119 int ipv6_setsockopt(struct sock *sk, int level, int optname,
120 char __user *optval, int optlen)
121 {
122 struct ipv6_pinfo *np = inet6_sk(sk);
123 int val, valbool;
124 int retv = -ENOPROTOOPT;
125
126 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
127 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
128
129 if(level!=SOL_IPV6)
130 goto out;
131
132 if (optval == NULL)
133 val=0;
134 else if (get_user(val, (int __user *) optval))
135 return -EFAULT;
136
137 valbool = (val!=0);
138
139 lock_sock(sk);
140
141 switch (optname) {
142
143 case IPV6_ADDRFORM:
144 if (val == PF_INET) {
145 struct ipv6_txoptions *opt;
146 struct sk_buff *pktopt;
147
148 if (sk->sk_protocol != IPPROTO_UDP &&
149 sk->sk_protocol != IPPROTO_TCP)
150 break;
151
152 if (sk->sk_state != TCP_ESTABLISHED) {
153 retv = -ENOTCONN;
154 break;
155 }
156
157 if (ipv6_only_sock(sk) ||
158 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
159 retv = -EADDRNOTAVAIL;
160 break;
161 }
162
163 fl6_free_socklist(sk);
164 ipv6_sock_mc_close(sk);
165
166 /*
167 * Sock is moving from IPv6 to IPv4 (sk_prot), so
168 * remove it from the refcnt debug socks count in the
169 * original family...
170 */
171 sk_refcnt_debug_dec(sk);
172
173 if (sk->sk_protocol == IPPROTO_TCP) {
174 struct tcp_sock *tp = tcp_sk(sk);
175
176 local_bh_disable();
177 sock_prot_dec_use(sk->sk_prot);
178 sock_prot_inc_use(&tcp_prot);
179 local_bh_enable();
180 sk->sk_prot = &tcp_prot;
181 tp->af_specific = &ipv4_specific;
182 sk->sk_socket->ops = &inet_stream_ops;
183 sk->sk_family = PF_INET;
184 tcp_sync_mss(sk, tp->pmtu_cookie);
185 } else {
186 local_bh_disable();
187 sock_prot_dec_use(sk->sk_prot);
188 sock_prot_inc_use(&udp_prot);
189 local_bh_enable();
190 sk->sk_prot = &udp_prot;
191 sk->sk_socket->ops = &inet_dgram_ops;
192 sk->sk_family = PF_INET;
193 }
194 opt = xchg(&np->opt, NULL);
195 if (opt)
196 sock_kfree_s(sk, opt, opt->tot_len);
197 pktopt = xchg(&np->pktoptions, NULL);
198 if (pktopt)
199 kfree_skb(pktopt);
200
201 sk->sk_destruct = inet_sock_destruct;
202 /*
203 * ... and add it to the refcnt debug socks count
204 * in the new family. -acme
205 */
206 sk_refcnt_debug_inc(sk);
207 module_put(THIS_MODULE);
208 retv = 0;
209 break;
210 }
211 goto e_inval;
212
213 case IPV6_V6ONLY:
214 if (inet_sk(sk)->num)
215 goto e_inval;
216 np->ipv6only = valbool;
217 retv = 0;
218 break;
219
220 case IPV6_PKTINFO:
221 np->rxopt.bits.rxinfo = valbool;
222 retv = 0;
223 break;
224
225 case IPV6_HOPLIMIT:
226 np->rxopt.bits.rxhlim = valbool;
227 retv = 0;
228 break;
229
230 case IPV6_RTHDR:
231 if (val < 0 || val > 2)
232 goto e_inval;
233 np->rxopt.bits.srcrt = val;
234 retv = 0;
235 break;
236
237 case IPV6_HOPOPTS:
238 np->rxopt.bits.hopopts = valbool;
239 retv = 0;
240 break;
241
242 case IPV6_DSTOPTS:
243 np->rxopt.bits.dstopts = valbool;
244 retv = 0;
245 break;
246
247 case IPV6_FLOWINFO:
248 np->rxopt.bits.rxflow = valbool;
249 retv = 0;
250 break;
251
252 case IPV6_PKTOPTIONS:
253 {
254 struct ipv6_txoptions *opt = NULL;
255 struct msghdr msg;
256 struct flowi fl;
257 int junk;
258
259 fl.fl6_flowlabel = 0;
260 fl.oif = sk->sk_bound_dev_if;
261
262 if (optlen == 0)
263 goto update;
264
265 /* 1K is probably excessive
266 * 1K is surely not enough, 2K per standard header is 16K.
267 */
268 retv = -EINVAL;
269 if (optlen > 64*1024)
270 break;
271
272 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
273 retv = -ENOBUFS;
274 if (opt == NULL)
275 break;
276
277 memset(opt, 0, sizeof(*opt));
278 opt->tot_len = sizeof(*opt) + optlen;
279 retv = -EFAULT;
280 if (copy_from_user(opt+1, optval, optlen))
281 goto done;
282
283 msg.msg_controllen = optlen;
284 msg.msg_control = (void*)(opt+1);
285
286 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
287 if (retv)
288 goto done;
289 update:
290 retv = 0;
291 if (sk->sk_type == SOCK_STREAM) {
292 if (opt) {
293 struct tcp_sock *tp = tcp_sk(sk);
294 if (!((1 << sk->sk_state) &
295 (TCPF_LISTEN | TCPF_CLOSE))
296 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
297 tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
298 tcp_sync_mss(sk, tp->pmtu_cookie);
299 }
300 }
301 opt = xchg(&np->opt, opt);
302 sk_dst_reset(sk);
303 } else {
304 write_lock(&sk->sk_dst_lock);
305 opt = xchg(&np->opt, opt);
306 write_unlock(&sk->sk_dst_lock);
307 sk_dst_reset(sk);
308 }
309
310 done:
311 if (opt)
312 sock_kfree_s(sk, opt, opt->tot_len);
313 break;
314 }
315 case IPV6_UNICAST_HOPS:
316 if (val > 255 || val < -1)
317 goto e_inval;
318 np->hop_limit = val;
319 retv = 0;
320 break;
321
322 case IPV6_MULTICAST_HOPS:
323 if (sk->sk_type == SOCK_STREAM)
324 goto e_inval;
325 if (val > 255 || val < -1)
326 goto e_inval;
327 np->mcast_hops = val;
328 retv = 0;
329 break;
330
331 case IPV6_MULTICAST_LOOP:
332 np->mc_loop = valbool;
333 retv = 0;
334 break;
335
336 case IPV6_MULTICAST_IF:
337 if (sk->sk_type == SOCK_STREAM)
338 goto e_inval;
339 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
340 goto e_inval;
341
342 if (__dev_get_by_index(val) == NULL) {
343 retv = -ENODEV;
344 break;
345 }
346 np->mcast_oif = val;
347 retv = 0;
348 break;
349 case IPV6_ADD_MEMBERSHIP:
350 case IPV6_DROP_MEMBERSHIP:
351 {
352 struct ipv6_mreq mreq;
353
354 retv = -EFAULT;
355 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
356 break;
357
358 if (optname == IPV6_ADD_MEMBERSHIP)
359 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
360 else
361 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
362 break;
363 }
364 case IPV6_JOIN_ANYCAST:
365 case IPV6_LEAVE_ANYCAST:
366 {
367 struct ipv6_mreq mreq;
368
369 if (optlen != sizeof(struct ipv6_mreq))
370 goto e_inval;
371
372 retv = -EFAULT;
373 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
374 break;
375
376 if (optname == IPV6_JOIN_ANYCAST)
377 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
378 else
379 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
380 break;
381 }
382 case MCAST_JOIN_GROUP:
383 case MCAST_LEAVE_GROUP:
384 {
385 struct group_req greq;
386 struct sockaddr_in6 *psin6;
387
388 retv = -EFAULT;
389 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
390 break;
391 if (greq.gr_group.ss_family != AF_INET6) {
392 retv = -EADDRNOTAVAIL;
393 break;
394 }
395 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
396 if (optname == MCAST_JOIN_GROUP)
397 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
398 &psin6->sin6_addr);
399 else
400 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
401 &psin6->sin6_addr);
402 break;
403 }
404 case MCAST_JOIN_SOURCE_GROUP:
405 case MCAST_LEAVE_SOURCE_GROUP:
406 case MCAST_BLOCK_SOURCE:
407 case MCAST_UNBLOCK_SOURCE:
408 {
409 struct group_source_req greqs;
410 int omode, add;
411
412 if (optlen != sizeof(struct group_source_req))
413 goto e_inval;
414 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
415 retv = -EFAULT;
416 break;
417 }
418 if (greqs.gsr_group.ss_family != AF_INET6 ||
419 greqs.gsr_source.ss_family != AF_INET6) {
420 retv = -EADDRNOTAVAIL;
421 break;
422 }
423 if (optname == MCAST_BLOCK_SOURCE) {
424 omode = MCAST_EXCLUDE;
425 add = 1;
426 } else if (optname == MCAST_UNBLOCK_SOURCE) {
427 omode = MCAST_EXCLUDE;
428 add = 0;
429 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
430 struct sockaddr_in6 *psin6;
431
432 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
433 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
434 &psin6->sin6_addr);
435 /* prior join w/ different source is ok */
436 if (retv && retv != -EADDRINUSE)
437 break;
438 omode = MCAST_INCLUDE;
439 add = 1;
440 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
441 omode = MCAST_INCLUDE;
442 add = 0;
443 }
444 retv = ip6_mc_source(add, omode, sk, &greqs);
445 break;
446 }
447 case MCAST_MSFILTER:
448 {
449 extern int sysctl_optmem_max;
450 extern int sysctl_mld_max_msf;
451 struct group_filter *gsf;
452
453 if (optlen < GROUP_FILTER_SIZE(0))
454 goto e_inval;
455 if (optlen > sysctl_optmem_max) {
456 retv = -ENOBUFS;
457 break;
458 }
459 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
460 if (gsf == 0) {
461 retv = -ENOBUFS;
462 break;
463 }
464 retv = -EFAULT;
465 if (copy_from_user(gsf, optval, optlen)) {
466 kfree(gsf);
467 break;
468 }
469 /* numsrc >= (4G-140)/128 overflow in 32 bits */
470 if (gsf->gf_numsrc >= 0x1ffffffU ||
471 gsf->gf_numsrc > sysctl_mld_max_msf) {
472 kfree(gsf);
473 retv = -ENOBUFS;
474 break;
475 }
476 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
477 kfree(gsf);
478 retv = -EINVAL;
479 break;
480 }
481 retv = ip6_mc_msfilter(sk, gsf);
482 kfree(gsf);
483
484 break;
485 }
486 case IPV6_ROUTER_ALERT:
487 retv = ip6_ra_control(sk, val, NULL);
488 break;
489 case IPV6_MTU_DISCOVER:
490 if (val<0 || val>2)
491 goto e_inval;
492 np->pmtudisc = val;
493 retv = 0;
494 break;
495 case IPV6_MTU:
496 if (val && val < IPV6_MIN_MTU)
497 goto e_inval;
498 np->frag_size = val;
499 retv = 0;
500 break;
501 case IPV6_RECVERR:
502 np->recverr = valbool;
503 if (!val)
504 skb_queue_purge(&sk->sk_error_queue);
505 retv = 0;
506 break;
507 case IPV6_FLOWINFO_SEND:
508 np->sndflow = valbool;
509 retv = 0;
510 break;
511 case IPV6_FLOWLABEL_MGR:
512 retv = ipv6_flowlabel_opt(sk, optval, optlen);
513 break;
514 case IPV6_IPSEC_POLICY:
515 case IPV6_XFRM_POLICY:
516 retv = -EPERM;
517 if (!capable(CAP_NET_ADMIN))
518 break;
519 retv = xfrm_user_policy(sk, optname, optval, optlen);
520 break;
521
522 #ifdef CONFIG_NETFILTER
523 default:
524 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
525 optlen);
526 break;
527 #endif
528
529 }
530 release_sock(sk);
531
532 out:
533 return retv;
534
535 e_inval:
536 release_sock(sk);
537 return -EINVAL;
538 }
539
540 int ipv6_getsockopt(struct sock *sk, int level, int optname,
541 char __user *optval, int __user *optlen)
542 {
543 struct ipv6_pinfo *np = inet6_sk(sk);
544 int len;
545 int val;
546
547 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
548 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
549 if(level!=SOL_IPV6)
550 return -ENOPROTOOPT;
551 if (get_user(len, optlen))
552 return -EFAULT;
553 switch (optname) {
554 case IPV6_ADDRFORM:
555 if (sk->sk_protocol != IPPROTO_UDP &&
556 sk->sk_protocol != IPPROTO_TCP)
557 return -EINVAL;
558 if (sk->sk_state != TCP_ESTABLISHED)
559 return -ENOTCONN;
560 val = sk->sk_family;
561 break;
562 case MCAST_MSFILTER:
563 {
564 struct group_filter gsf;
565 int err;
566
567 if (len < GROUP_FILTER_SIZE(0))
568 return -EINVAL;
569 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
570 return -EFAULT;
571 lock_sock(sk);
572 err = ip6_mc_msfget(sk, &gsf,
573 (struct group_filter __user *)optval, optlen);
574 release_sock(sk);
575 return err;
576 }
577
578 case IPV6_PKTOPTIONS:
579 {
580 struct msghdr msg;
581 struct sk_buff *skb;
582
583 if (sk->sk_type != SOCK_STREAM)
584 return -ENOPROTOOPT;
585
586 msg.msg_control = optval;
587 msg.msg_controllen = len;
588 msg.msg_flags = 0;
589
590 lock_sock(sk);
591 skb = np->pktoptions;
592 if (skb)
593 atomic_inc(&skb->users);
594 release_sock(sk);
595
596 if (skb) {
597 int err = datagram_recv_ctl(sk, &msg, skb);
598 kfree_skb(skb);
599 if (err)
600 return err;
601 } else {
602 if (np->rxopt.bits.rxinfo) {
603 struct in6_pktinfo src_info;
604 src_info.ipi6_ifindex = np->mcast_oif;
605 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
606 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
607 }
608 if (np->rxopt.bits.rxhlim) {
609 int hlim = np->mcast_hops;
610 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
611 }
612 }
613 len -= msg.msg_controllen;
614 return put_user(len, optlen);
615 }
616 case IPV6_MTU:
617 {
618 struct dst_entry *dst;
619 val = 0;
620 lock_sock(sk);
621 dst = sk_dst_get(sk);
622 if (dst) {
623 val = dst_mtu(dst);
624 dst_release(dst);
625 }
626 release_sock(sk);
627 if (!val)
628 return -ENOTCONN;
629 break;
630 }
631
632 case IPV6_V6ONLY:
633 val = np->ipv6only;
634 break;
635
636 case IPV6_PKTINFO:
637 val = np->rxopt.bits.rxinfo;
638 break;
639
640 case IPV6_HOPLIMIT:
641 val = np->rxopt.bits.rxhlim;
642 break;
643
644 case IPV6_RTHDR:
645 val = np->rxopt.bits.srcrt;
646 break;
647
648 case IPV6_HOPOPTS:
649 val = np->rxopt.bits.hopopts;
650 break;
651
652 case IPV6_DSTOPTS:
653 val = np->rxopt.bits.dstopts;
654 break;
655
656 case IPV6_FLOWINFO:
657 val = np->rxopt.bits.rxflow;
658 break;
659
660 case IPV6_UNICAST_HOPS:
661 val = np->hop_limit;
662 break;
663
664 case IPV6_MULTICAST_HOPS:
665 val = np->mcast_hops;
666 break;
667
668 case IPV6_MULTICAST_LOOP:
669 val = np->mc_loop;
670 break;
671
672 case IPV6_MULTICAST_IF:
673 val = np->mcast_oif;
674 break;
675
676 case IPV6_MTU_DISCOVER:
677 val = np->pmtudisc;
678 break;
679
680 case IPV6_RECVERR:
681 val = np->recverr;
682 break;
683
684 case IPV6_FLOWINFO_SEND:
685 val = np->sndflow;
686 break;
687
688 default:
689 #ifdef CONFIG_NETFILTER
690 lock_sock(sk);
691 val = nf_getsockopt(sk, PF_INET6, optname, optval,
692 &len);
693 release_sock(sk);
694 if (val >= 0)
695 val = put_user(len, optlen);
696 return val;
697 #else
698 return -EINVAL;
699 #endif
700 }
701 len = min_t(unsigned int, sizeof(int), len);
702 if(put_user(len, optlen))
703 return -EFAULT;
704 if(copy_to_user(optval,&val,len))
705 return -EFAULT;
706 return 0;
707 }
708
709 void __init ipv6_packet_init(void)
710 {
711 dev_add_pack(&ipv6_packet_type);
712 }
713
714 void ipv6_packet_cleanup(void)
715 {
716 dev_remove_pack(&ipv6_packet_type);
717 }
Linux kernel - Deliverables
This page took 0.045492 seconds and 6 git commands to generate.