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[LIB]: Make TEXTSEARCH_BM plain tristate like the others
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ipv6_sockglue.c
CommitLineData
1da177e4
LT		 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
58DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
59
60static struct packet_type ipv6_packet_type = {
61 .type = __constant_htons(ETH_P_IPV6),
62 .func = ipv6_rcv,
63};
64
65struct ip6_ra_chain *ip6_ra_chain;
66DEFINE_RWLOCK(ip6_ra_lock);
67
68int 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
1da177e4
LT		 112int 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
e6848976
ACM		 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
1da177e4
LT		 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;
e6848976
ACM		 195 /*
196 * ... and add it to the refcnt debug socks count
197 * in the new family. -acme
198 */
199 sk_refcnt_debug_inc(sk);
1da177e4
LT		 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_PKTINFO:
214 np->rxopt.bits.rxinfo = valbool;
215 retv = 0;
216 break;
217
218 case IPV6_HOPLIMIT:
219 np->rxopt.bits.rxhlim = valbool;
220 retv = 0;
221 break;
222
223 case IPV6_RTHDR:
224 if (val < 0 || val > 2)
225 goto e_inval;
226 np->rxopt.bits.srcrt = val;
227 retv = 0;
228 break;
229
230 case IPV6_HOPOPTS:
231 np->rxopt.bits.hopopts = valbool;
232 retv = 0;
233 break;
234
235 case IPV6_DSTOPTS:
236 np->rxopt.bits.dstopts = valbool;
237 retv = 0;
238 break;
239
240 case IPV6_FLOWINFO:
241 np->rxopt.bits.rxflow = valbool;
242 retv = 0;
243 break;
244
245 case IPV6_PKTOPTIONS:
246 {
247 struct ipv6_txoptions *opt = NULL;
248 struct msghdr msg;
249 struct flowi fl;
250 int junk;
251
252 fl.fl6_flowlabel = 0;
253 fl.oif = sk->sk_bound_dev_if;
254
255 if (optlen == 0)
256 goto update;
257
258 /* 1K is probably excessive
259 * 1K is surely not enough, 2K per standard header is 16K.
260 */
261 retv = -EINVAL;
262 if (optlen > 64*1024)
263 break;
264
265 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
266 retv = -ENOBUFS;
267 if (opt == NULL)
268 break;
269
270 memset(opt, 0, sizeof(*opt));
271 opt->tot_len = sizeof(*opt) + optlen;
272 retv = -EFAULT;
273 if (copy_from_user(opt+1, optval, optlen))
274 goto done;
275
276 msg.msg_controllen = optlen;
277 msg.msg_control = (void*)(opt+1);
278
279 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
280 if (retv)
281 goto done;
282update:
283 retv = 0;
284 if (sk->sk_type == SOCK_STREAM) {
285 if (opt) {
286 struct tcp_sock *tp = tcp_sk(sk);
287 if (!((1 << sk->sk_state) &
288 (TCPF_LISTEN | TCPF_CLOSE))
289 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
290 tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
291 tcp_sync_mss(sk, tp->pmtu_cookie);
292 }
293 }
294 opt = xchg(&np->opt, opt);
295 sk_dst_reset(sk);
296 } else {
297 write_lock(&sk->sk_dst_lock);
298 opt = xchg(&np->opt, opt);
299 write_unlock(&sk->sk_dst_lock);
300 sk_dst_reset(sk);
301 }
302
303done:
304 if (opt)
305 sock_kfree_s(sk, opt, opt->tot_len);
306 break;
307 }
308 case IPV6_UNICAST_HOPS:
309 if (val > 255 || val < -1)
310 goto e_inval;
311 np->hop_limit = val;
312 retv = 0;
313 break;
314
315 case IPV6_MULTICAST_HOPS:
316 if (sk->sk_type == SOCK_STREAM)
317 goto e_inval;
318 if (val > 255 || val < -1)
319 goto e_inval;
320 np->mcast_hops = val;
321 retv = 0;
322 break;
323
324 case IPV6_MULTICAST_LOOP:
325 np->mc_loop = valbool;
326 retv = 0;
327 break;
328
329 case IPV6_MULTICAST_IF:
330 if (sk->sk_type == SOCK_STREAM)
331 goto e_inval;
332 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
333 goto e_inval;
334
335 if (__dev_get_by_index(val) == NULL) {
336 retv = -ENODEV;
337 break;
338 }
339 np->mcast_oif = val;
340 retv = 0;
341 break;
342 case IPV6_ADD_MEMBERSHIP:
343 case IPV6_DROP_MEMBERSHIP:
344 {
345 struct ipv6_mreq mreq;
346
347 retv = -EFAULT;
348 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
349 break;
350
351 if (optname == IPV6_ADD_MEMBERSHIP)
352 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
353 else
354 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
355 break;
356 }
357 case IPV6_JOIN_ANYCAST:
358 case IPV6_LEAVE_ANYCAST:
359 {
360 struct ipv6_mreq mreq;
361
362 if (optlen != sizeof(struct ipv6_mreq))
363 goto e_inval;
364
365 retv = -EFAULT;
366 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
367 break;
368
369 if (optname == IPV6_JOIN_ANYCAST)
370 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
371 else
372 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
373 break;
374 }
375 case MCAST_JOIN_GROUP:
376 case MCAST_LEAVE_GROUP:
377 {
378 struct group_req greq;
379 struct sockaddr_in6 *psin6;
380
381 retv = -EFAULT;
382 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
383 break;
384 if (greq.gr_group.ss_family != AF_INET6) {
385 retv = -EADDRNOTAVAIL;
386 break;
387 }
388 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
389 if (optname == MCAST_JOIN_GROUP)
390 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
391 &psin6->sin6_addr);
392 else
393 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
394 &psin6->sin6_addr);
395 break;
396 }
397 case MCAST_JOIN_SOURCE_GROUP:
398 case MCAST_LEAVE_SOURCE_GROUP:
399 case MCAST_BLOCK_SOURCE:
400 case MCAST_UNBLOCK_SOURCE:
401 {
402 struct group_source_req greqs;
403 int omode, add;
404
405 if (optlen != sizeof(struct group_source_req))
406 goto e_inval;
407 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
408 retv = -EFAULT;
409 break;
410 }
411 if (greqs.gsr_group.ss_family != AF_INET6 ||
412 greqs.gsr_source.ss_family != AF_INET6) {
413 retv = -EADDRNOTAVAIL;
414 break;
415 }
416 if (optname == MCAST_BLOCK_SOURCE) {
417 omode = MCAST_EXCLUDE;
418 add = 1;
419 } else if (optname == MCAST_UNBLOCK_SOURCE) {
420 omode = MCAST_EXCLUDE;
421 add = 0;
422 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
423 struct sockaddr_in6 *psin6;
424
425 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
426 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
427 &psin6->sin6_addr);
c9e3e8b6
DS		 428 /* prior join w/ different source is ok */
429 if (retv && retv != -EADDRINUSE)
1da177e4
LT		 430 break;
431 omode = MCAST_INCLUDE;
432 add = 1;
c9e3e8b6 433 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1da177e4
LT		 434 omode = MCAST_INCLUDE;
435 add = 0;
436 }
437 retv = ip6_mc_source(add, omode, sk, &greqs);
438 break;
439 }
440 case MCAST_MSFILTER:
441 {
1da177e4
LT		 442 extern int sysctl_mld_max_msf;
443 struct group_filter *gsf;
444
445 if (optlen < GROUP_FILTER_SIZE(0))
446 goto e_inval;
447 if (optlen > sysctl_optmem_max) {
448 retv = -ENOBUFS;
449 break;
450 }
451 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
452 if (gsf == 0) {
453 retv = -ENOBUFS;
454 break;
455 }
456 retv = -EFAULT;
457 if (copy_from_user(gsf, optval, optlen)) {
458 kfree(gsf);
459 break;
460 }
461 /* numsrc >= (4G-140)/128 overflow in 32 bits */
462 if (gsf->gf_numsrc >= 0x1ffffffU ||
463 gsf->gf_numsrc > sysctl_mld_max_msf) {
464 kfree(gsf);
465 retv = -ENOBUFS;
466 break;
467 }
468 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
469 kfree(gsf);
470 retv = -EINVAL;
471 break;
472 }
473 retv = ip6_mc_msfilter(sk, gsf);
474 kfree(gsf);
475
476 break;
477 }
478 case IPV6_ROUTER_ALERT:
479 retv = ip6_ra_control(sk, val, NULL);
480 break;
481 case IPV6_MTU_DISCOVER:
482 if (val<0 || val>2)
483 goto e_inval;
484 np->pmtudisc = val;
485 retv = 0;
486 break;
487 case IPV6_MTU:
488 if (val && val < IPV6_MIN_MTU)
489 goto e_inval;
490 np->frag_size = val;
491 retv = 0;
492 break;
493 case IPV6_RECVERR:
494 np->recverr = valbool;
495 if (!val)
496 skb_queue_purge(&sk->sk_error_queue);
497 retv = 0;
498 break;
499 case IPV6_FLOWINFO_SEND:
500 np->sndflow = valbool;
501 retv = 0;
502 break;
503 case IPV6_FLOWLABEL_MGR:
504 retv = ipv6_flowlabel_opt(sk, optval, optlen);
505 break;
506 case IPV6_IPSEC_POLICY:
507 case IPV6_XFRM_POLICY:
6fc0b4a7
HX		 508 retv = -EPERM;
509 if (!capable(CAP_NET_ADMIN))
510 break;
1da177e4
LT		 511 retv = xfrm_user_policy(sk, optname, optval, optlen);
512 break;
513
514#ifdef CONFIG_NETFILTER
515 default:
516 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
517 optlen);
518 break;
519#endif
520
521 }
522 release_sock(sk);
523
524out:
525 return retv;
526
527e_inval:
528 release_sock(sk);
529 return -EINVAL;
530}
531
532int ipv6_getsockopt(struct sock *sk, int level, int optname,
533 char __user *optval, int __user *optlen)
534{
535 struct ipv6_pinfo *np = inet6_sk(sk);
536 int len;
537 int val;
538
539 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
540 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
541 if(level!=SOL_IPV6)
542 return -ENOPROTOOPT;
543 if (get_user(len, optlen))
544 return -EFAULT;
545 switch (optname) {
546 case IPV6_ADDRFORM:
547 if (sk->sk_protocol != IPPROTO_UDP &&
548 sk->sk_protocol != IPPROTO_TCP)
549 return -EINVAL;
550 if (sk->sk_state != TCP_ESTABLISHED)
551 return -ENOTCONN;
552 val = sk->sk_family;
553 break;
554 case MCAST_MSFILTER:
555 {
556 struct group_filter gsf;
557 int err;
558
559 if (len < GROUP_FILTER_SIZE(0))
560 return -EINVAL;
561 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
562 return -EFAULT;
563 lock_sock(sk);
564 err = ip6_mc_msfget(sk, &gsf,
565 (struct group_filter __user *)optval, optlen);
566 release_sock(sk);
567 return err;
568 }
569
570 case IPV6_PKTOPTIONS:
571 {
572 struct msghdr msg;
573 struct sk_buff *skb;
574
575 if (sk->sk_type != SOCK_STREAM)
576 return -ENOPROTOOPT;
577
578 msg.msg_control = optval;
579 msg.msg_controllen = len;
580 msg.msg_flags = 0;
581
582 lock_sock(sk);
583 skb = np->pktoptions;
584 if (skb)
585 atomic_inc(&skb->users);
586 release_sock(sk);
587
588 if (skb) {
589 int err = datagram_recv_ctl(sk, &msg, skb);
590 kfree_skb(skb);
591 if (err)
592 return err;
593 } else {
594 if (np->rxopt.bits.rxinfo) {
595 struct in6_pktinfo src_info;
596 src_info.ipi6_ifindex = np->mcast_oif;
597 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
598 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
599 }
600 if (np->rxopt.bits.rxhlim) {
601 int hlim = np->mcast_hops;
602 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
603 }
604 }
605 len -= msg.msg_controllen;
606 return put_user(len, optlen);
607 }
608 case IPV6_MTU:
609 {
610 struct dst_entry *dst;
611 val = 0;
612 lock_sock(sk);
613 dst = sk_dst_get(sk);
614 if (dst) {
615 val = dst_mtu(dst);
616 dst_release(dst);
617 }
618 release_sock(sk);
619 if (!val)
620 return -ENOTCONN;
621 break;
622 }
623
624 case IPV6_V6ONLY:
625 val = np->ipv6only;
626 break;
627
628 case IPV6_PKTINFO:
629 val = np->rxopt.bits.rxinfo;
630 break;
631
632 case IPV6_HOPLIMIT:
633 val = np->rxopt.bits.rxhlim;
634 break;
635
636 case IPV6_RTHDR:
637 val = np->rxopt.bits.srcrt;
638 break;
639
640 case IPV6_HOPOPTS:
641 val = np->rxopt.bits.hopopts;
642 break;
643
644 case IPV6_DSTOPTS:
645 val = np->rxopt.bits.dstopts;
646 break;
647
648 case IPV6_FLOWINFO:
649 val = np->rxopt.bits.rxflow;
650 break;
651
652 case IPV6_UNICAST_HOPS:
653 val = np->hop_limit;
654 break;
655
656 case IPV6_MULTICAST_HOPS:
657 val = np->mcast_hops;
658 break;
659
660 case IPV6_MULTICAST_LOOP:
661 val = np->mc_loop;
662 break;
663
664 case IPV6_MULTICAST_IF:
665 val = np->mcast_oif;
666 break;
667
668 case IPV6_MTU_DISCOVER:
669 val = np->pmtudisc;
670 break;
671
672 case IPV6_RECVERR:
673 val = np->recverr;
674 break;
675
676 case IPV6_FLOWINFO_SEND:
677 val = np->sndflow;
678 break;
679
680 default:
681#ifdef CONFIG_NETFILTER
682 lock_sock(sk);
683 val = nf_getsockopt(sk, PF_INET6, optname, optval,
684 &len);
685 release_sock(sk);
686 if (val >= 0)
687 val = put_user(len, optlen);
688 return val;
689#else
690 return -EINVAL;
691#endif
692 }
693 len = min_t(unsigned int, sizeof(int), len);
694 if(put_user(len, optlen))
695 return -EFAULT;
696 if(copy_to_user(optval,&val,len))
697 return -EFAULT;
698 return 0;
699}
700
701void __init ipv6_packet_init(void)
702{
703 dev_add_pack(&ipv6_packet_type);
704}
705
706void ipv6_packet_cleanup(void)
707{
708 dev_remove_pack(&ipv6_packet_type);
709}
kernel source for telekom puls (alcatel/mediatek)