2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/net/ipv4/ip_sockglue.c
10 * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
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.
17 * FIXME: Make the setsockopt code POSIX compliant: That is
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
24 * David L Stevens <dlstevens@us.ibm.com>:
25 * - added multicast source filtering API for MLDv2
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>
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>
56 #include <asm/uaccess.h>
58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
60 static struct packet_type ipv6_packet_type = {
61 .type = __constant_htons(ETH_P_IPV6),
65 struct ip6_ra_chain *ip6_ra_chain;
66 DEFINE_RWLOCK(ip6_ra_lock);
68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
70 struct ip6_ra_chain *ra, *new_ra, **rap;
72 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
73 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
76 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
78 write_lock_bh(&ip6_ra_lock);
79 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
82 write_unlock_bh(&ip6_ra_lock);
89 write_unlock_bh(&ip6_ra_lock);
99 write_unlock_bh(&ip6_ra_lock);
104 new_ra->destructor = destructor;
108 write_unlock_bh(&ip6_ra_lock);
112 int ipv6_setsockopt(struct sock *sk, int level, int optname,
113 char __user *optval, int optlen)
115 struct ipv6_pinfo *np = inet6_sk(sk);
117 int retv = -ENOPROTOOPT;
119 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
120 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
127 else if (get_user(val, (int __user *) optval))
137 if (val == PF_INET) {
138 struct ipv6_txoptions *opt;
139 struct sk_buff *pktopt;
141 if (sk->sk_protocol != IPPROTO_UDP &&
142 sk->sk_protocol != IPPROTO_TCP)
145 if (sk->sk_state != TCP_ESTABLISHED) {
150 if (ipv6_only_sock(sk) ||
151 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
152 retv = -EADDRNOTAVAIL;
156 fl6_free_socklist(sk);
157 ipv6_sock_mc_close(sk);
160 * Sock is moving from IPv6 to IPv4 (sk_prot), so
161 * remove it from the refcnt debug socks count in the
164 sk_refcnt_debug_dec(sk);
166 if (sk->sk_protocol == IPPROTO_TCP) {
167 struct tcp_sock *tp = tcp_sk(sk);
170 sock_prot_dec_use(sk->sk_prot);
171 sock_prot_inc_use(&tcp_prot);
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);
180 sock_prot_dec_use(sk->sk_prot);
181 sock_prot_inc_use(&udp_prot);
183 sk->sk_prot = &udp_prot;
184 sk->sk_socket->ops = &inet_dgram_ops;
185 sk->sk_family = PF_INET;
187 opt = xchg(&np->opt, NULL);
189 sock_kfree_s(sk, opt, opt->tot_len);
190 pktopt = xchg(&np->pktoptions, NULL);
194 sk->sk_destruct = inet_sock_destruct;
196 * ... and add it to the refcnt debug socks count
197 * in the new family. -acme
199 sk_refcnt_debug_inc(sk);
200 module_put(THIS_MODULE);
207 if (inet_sk(sk)->num)
209 np->ipv6only = valbool;
213 case IPV6_RECVPKTINFO:
214 np->rxopt.bits.rxinfo = valbool;
218 case IPV6_2292PKTINFO:
219 np->rxopt.bits.rxoinfo = valbool;
223 case IPV6_RECVHOPLIMIT:
224 np->rxopt.bits.rxhlim = valbool;
228 case IPV6_2292HOPLIMIT:
229 np->rxopt.bits.rxohlim = valbool;
234 if (val < 0 || val > 2)
236 np->rxopt.bits.srcrt = val;
241 if (val < 0 || val > 2)
243 np->rxopt.bits.osrcrt = val;
247 case IPV6_RECVHOPOPTS:
248 np->rxopt.bits.hopopts = valbool;
252 case IPV6_2292HOPOPTS:
253 np->rxopt.bits.ohopopts = valbool;
257 case IPV6_RECVDSTOPTS:
258 np->rxopt.bits.dstopts = valbool;
262 case IPV6_2292DSTOPTS:
263 np->rxopt.bits.odstopts = valbool;
268 if (val < 0 || val > 0xff)
274 case IPV6_RECVTCLASS:
275 np->rxopt.bits.rxtclass = valbool;
280 np->rxopt.bits.rxflow = valbool;
285 case IPV6_RTHDRDSTOPTS:
289 struct ipv6_txoptions *opt;
293 /* hop-by-hop / destination options are privileged option */
295 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
299 if (optlen & 0x7 || optlen > 8 * 255)
302 opt = ipv6_renew_options(sk, np->opt, optname,
303 (struct ipv6_opt_hdr __user *)optval,
310 /* routing header option needs extra check */
311 if (optname == IPV6_RTHDR && opt->srcrt) {
312 struct ipv6_rt_hdr *rthdr = opt->srcrt;
315 if ((rthdr->hdrlen & 1) ||
316 (rthdr->hdrlen >> 1) != rthdr->segments_left)
321 if (sk->sk_type == SOCK_STREAM) {
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);
331 opt = xchg(&np->opt, opt);
334 write_lock(&sk->sk_dst_lock);
335 opt = xchg(&np->opt, opt);
336 write_unlock(&sk->sk_dst_lock);
341 sock_kfree_s(sk, opt, opt->tot_len);
345 case IPV6_2292PKTOPTIONS:
347 struct ipv6_txoptions *opt = NULL;
352 fl.fl6_flowlabel = 0;
353 fl.oif = sk->sk_bound_dev_if;
358 /* 1K is probably excessive
359 * 1K is surely not enough, 2K per standard header is 16K.
362 if (optlen > 64*1024)
365 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
370 memset(opt, 0, sizeof(*opt));
371 opt->tot_len = sizeof(*opt) + optlen;
373 if (copy_from_user(opt+1, optval, optlen))
376 msg.msg_controllen = optlen;
377 msg.msg_control = (void*)(opt+1);
379 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
384 if (sk->sk_type == SOCK_STREAM) {
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);
394 opt = xchg(&np->opt, opt);
397 write_lock(&sk->sk_dst_lock);
398 opt = xchg(&np->opt, opt);
399 write_unlock(&sk->sk_dst_lock);
405 sock_kfree_s(sk, opt, opt->tot_len);
408 case IPV6_UNICAST_HOPS:
409 if (val > 255 || val < -1)
415 case IPV6_MULTICAST_HOPS:
416 if (sk->sk_type == SOCK_STREAM)
418 if (val > 255 || val < -1)
420 np->mcast_hops = val;
424 case IPV6_MULTICAST_LOOP:
425 np->mc_loop = valbool;
429 case IPV6_MULTICAST_IF:
430 if (sk->sk_type == SOCK_STREAM)
432 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
435 if (__dev_get_by_index(val) == NULL) {
442 case IPV6_ADD_MEMBERSHIP:
443 case IPV6_DROP_MEMBERSHIP:
445 struct ipv6_mreq mreq;
448 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
451 if (optname == IPV6_ADD_MEMBERSHIP)
452 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
454 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
457 case IPV6_JOIN_ANYCAST:
458 case IPV6_LEAVE_ANYCAST:
460 struct ipv6_mreq mreq;
462 if (optlen != sizeof(struct ipv6_mreq))
466 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
469 if (optname == IPV6_JOIN_ANYCAST)
470 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
472 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
475 case MCAST_JOIN_GROUP:
476 case MCAST_LEAVE_GROUP:
478 struct group_req greq;
479 struct sockaddr_in6 *psin6;
482 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
484 if (greq.gr_group.ss_family != AF_INET6) {
485 retv = -EADDRNOTAVAIL;
488 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
489 if (optname == MCAST_JOIN_GROUP)
490 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
493 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
497 case MCAST_JOIN_SOURCE_GROUP:
498 case MCAST_LEAVE_SOURCE_GROUP:
499 case MCAST_BLOCK_SOURCE:
500 case MCAST_UNBLOCK_SOURCE:
502 struct group_source_req greqs;
505 if (optlen != sizeof(struct group_source_req))
507 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
511 if (greqs.gsr_group.ss_family != AF_INET6 ||
512 greqs.gsr_source.ss_family != AF_INET6) {
513 retv = -EADDRNOTAVAIL;
516 if (optname == MCAST_BLOCK_SOURCE) {
517 omode = MCAST_EXCLUDE;
519 } else if (optname == MCAST_UNBLOCK_SOURCE) {
520 omode = MCAST_EXCLUDE;
522 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
523 struct sockaddr_in6 *psin6;
525 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
526 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
528 /* prior join w/ different source is ok */
529 if (retv && retv != -EADDRINUSE)
531 omode = MCAST_INCLUDE;
533 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
534 omode = MCAST_INCLUDE;
537 retv = ip6_mc_source(add, omode, sk, &greqs);
542 extern int sysctl_mld_max_msf;
543 struct group_filter *gsf;
545 if (optlen < GROUP_FILTER_SIZE(0))
547 if (optlen > sysctl_optmem_max) {
551 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
557 if (copy_from_user(gsf, optval, optlen)) {
561 /* numsrc >= (4G-140)/128 overflow in 32 bits */
562 if (gsf->gf_numsrc >= 0x1ffffffU ||
563 gsf->gf_numsrc > sysctl_mld_max_msf) {
568 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
573 retv = ip6_mc_msfilter(sk, gsf);
578 case IPV6_ROUTER_ALERT:
579 retv = ip6_ra_control(sk, val, NULL);
581 case IPV6_MTU_DISCOVER:
588 if (val && val < IPV6_MIN_MTU)
594 np->recverr = valbool;
596 skb_queue_purge(&sk->sk_error_queue);
599 case IPV6_FLOWINFO_SEND:
600 np->sndflow = valbool;
603 case IPV6_FLOWLABEL_MGR:
604 retv = ipv6_flowlabel_opt(sk, optval, optlen);
606 case IPV6_IPSEC_POLICY:
607 case IPV6_XFRM_POLICY:
609 if (!capable(CAP_NET_ADMIN))
611 retv = xfrm_user_policy(sk, optname, optval, optlen);
614 #ifdef CONFIG_NETFILTER
616 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
632 int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
633 char __user *optval, int len)
637 len = min_t(int, len, ipv6_optlen(hdr));
638 if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
643 int ipv6_getsockopt(struct sock *sk, int level, int optname,
644 char __user *optval, int __user *optlen)
646 struct ipv6_pinfo *np = inet6_sk(sk);
650 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
651 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
654 if (get_user(len, optlen))
658 if (sk->sk_protocol != IPPROTO_UDP &&
659 sk->sk_protocol != IPPROTO_TCP)
661 if (sk->sk_state != TCP_ESTABLISHED)
667 struct group_filter gsf;
670 if (len < GROUP_FILTER_SIZE(0))
672 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
675 err = ip6_mc_msfget(sk, &gsf,
676 (struct group_filter __user *)optval, optlen);
681 case IPV6_2292PKTOPTIONS:
686 if (sk->sk_type != SOCK_STREAM)
689 msg.msg_control = optval;
690 msg.msg_controllen = len;
694 skb = np->pktoptions;
696 atomic_inc(&skb->users);
700 int err = datagram_recv_ctl(sk, &msg, skb);
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);
711 if (np->rxopt.bits.rxhlim) {
712 int hlim = np->mcast_hops;
713 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
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);
721 if (np->rxopt.bits.rxohlim) {
722 int hlim = np->mcast_hops;
723 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
726 len -= msg.msg_controllen;
727 return put_user(len, optlen);
731 struct dst_entry *dst;
734 dst = sk_dst_get(sk);
749 case IPV6_RECVPKTINFO:
750 val = np->rxopt.bits.rxinfo;
753 case IPV6_2292PKTINFO:
754 val = np->rxopt.bits.rxoinfo;
757 case IPV6_RECVHOPLIMIT:
758 val = np->rxopt.bits.rxhlim;
761 case IPV6_2292HOPLIMIT:
762 val = np->rxopt.bits.rxohlim;
766 val = np->rxopt.bits.srcrt;
770 val = np->rxopt.bits.osrcrt;
774 case IPV6_RTHDRDSTOPTS:
780 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
783 return put_user(len, optlen);
786 case IPV6_RECVHOPOPTS:
787 val = np->rxopt.bits.hopopts;
790 case IPV6_2292HOPOPTS:
791 val = np->rxopt.bits.ohopopts;
794 case IPV6_RECVDSTOPTS:
795 val = np->rxopt.bits.dstopts;
798 case IPV6_2292DSTOPTS:
799 val = np->rxopt.bits.odstopts;
806 case IPV6_RECVTCLASS:
807 val = np->rxopt.bits.rxtclass;
811 val = np->rxopt.bits.rxflow;
814 case IPV6_UNICAST_HOPS:
818 case IPV6_MULTICAST_HOPS:
819 val = np->mcast_hops;
822 case IPV6_MULTICAST_LOOP:
826 case IPV6_MULTICAST_IF:
830 case IPV6_MTU_DISCOVER:
838 case IPV6_FLOWINFO_SEND:
843 #ifdef CONFIG_NETFILTER
845 val = nf_getsockopt(sk, PF_INET6, optname, optval,
849 val = put_user(len, optlen);
855 len = min_t(unsigned int, sizeof(int), len);
856 if(put_user(len, optlen))
858 if(copy_to_user(optval,&val,len))
863 void __init ipv6_packet_init(void)
865 dev_add_pack(&ipv6_packet_type);
868 void ipv6_packet_cleanup(void)
870 dev_remove_pack(&ipv6_packet_type);