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 Truncate getsockopt returns
20 * o Return an optlen of the truncated length if need be
23 * David L Stevens <dlstevens@us.ibm.com>:
24 * - added multicast source filtering API for MLDv2
27 #include <linux/module.h>
28 #include <linux/capability.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/mroute6.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>
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>
53 #include <net/udplite.h>
56 #include <asm/uaccess.h>
58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
60 struct ip6_ra_chain *ip6_ra_chain;
61 DEFINE_RWLOCK(ip6_ra_lock);
63 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
65 struct ip6_ra_chain *ra, *new_ra, **rap;
67 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
68 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
71 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
73 write_lock_bh(&ip6_ra_lock);
74 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
77 write_unlock_bh(&ip6_ra_lock);
83 write_unlock_bh(&ip6_ra_lock);
93 write_unlock_bh(&ip6_ra_lock);
98 new_ra->destructor = destructor;
102 write_unlock_bh(&ip6_ra_lock);
106 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
107 char __user *optval, int optlen)
109 struct ipv6_pinfo *np = inet6_sk(sk);
110 struct net *net = sock_net(sk);
112 int retv = -ENOPROTOOPT;
117 if (optlen >= sizeof(int)) {
118 if (get_user(val, (int __user *) optval))
126 if (ip6_mroute_opt(optname))
127 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
134 if (optlen < sizeof(int))
136 if (val == PF_INET) {
137 struct ipv6_txoptions *opt;
138 struct sk_buff *pktopt;
140 if (sk->sk_protocol != IPPROTO_UDP &&
141 sk->sk_protocol != IPPROTO_UDPLITE &&
142 sk->sk_protocol != IPPROTO_TCP)
145 if (sk->sk_state != TCP_ESTABLISHED) {
150 if (ipv6_only_sock(sk) ||
151 !ipv6_addr_v4mapped(&np->daddr)) {
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 inet_connection_sock *icsk = inet_csk(sk);
169 sock_prot_inuse_add(net, sk->sk_prot, -1);
170 sock_prot_inuse_add(net, &tcp_prot, 1);
172 sk->sk_prot = &tcp_prot;
173 icsk->icsk_af_ops = &ipv4_specific;
174 sk->sk_socket->ops = &inet_stream_ops;
175 sk->sk_family = PF_INET;
176 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
178 struct proto *prot = &udp_prot;
180 if (sk->sk_protocol == IPPROTO_UDPLITE)
181 prot = &udplite_prot;
183 sock_prot_inuse_add(net, sk->sk_prot, -1);
184 sock_prot_inuse_add(net, prot, 1);
187 sk->sk_socket->ops = &inet_dgram_ops;
188 sk->sk_family = PF_INET;
190 opt = xchg(&np->opt, NULL);
192 sock_kfree_s(sk, opt, opt->tot_len);
193 pktopt = xchg(&np->pktoptions, NULL);
197 sk->sk_destruct = inet_sock_destruct;
199 * ... and add it to the refcnt debug socks count
200 * in the new family. -acme
202 sk_refcnt_debug_inc(sk);
203 module_put(THIS_MODULE);
210 if (optlen < sizeof(int) ||
213 np->ipv6only = valbool;
217 case IPV6_RECVPKTINFO:
218 if (optlen < sizeof(int))
220 np->rxopt.bits.rxinfo = valbool;
224 case IPV6_2292PKTINFO:
225 if (optlen < sizeof(int))
227 np->rxopt.bits.rxoinfo = valbool;
231 case IPV6_RECVHOPLIMIT:
232 if (optlen < sizeof(int))
234 np->rxopt.bits.rxhlim = valbool;
238 case IPV6_2292HOPLIMIT:
239 if (optlen < sizeof(int))
241 np->rxopt.bits.rxohlim = valbool;
246 if (optlen < sizeof(int))
248 np->rxopt.bits.srcrt = valbool;
253 if (optlen < sizeof(int))
255 np->rxopt.bits.osrcrt = valbool;
259 case IPV6_RECVHOPOPTS:
260 if (optlen < sizeof(int))
262 np->rxopt.bits.hopopts = valbool;
266 case IPV6_2292HOPOPTS:
267 if (optlen < sizeof(int))
269 np->rxopt.bits.ohopopts = valbool;
273 case IPV6_RECVDSTOPTS:
274 if (optlen < sizeof(int))
276 np->rxopt.bits.dstopts = valbool;
280 case IPV6_2292DSTOPTS:
281 if (optlen < sizeof(int))
283 np->rxopt.bits.odstopts = valbool;
288 if (optlen < sizeof(int))
290 if (val < -1 || val > 0xff)
296 case IPV6_RECVTCLASS:
297 if (optlen < sizeof(int))
299 np->rxopt.bits.rxtclass = valbool;
304 if (optlen < sizeof(int))
306 np->rxopt.bits.rxflow = valbool;
311 case IPV6_RTHDRDSTOPTS:
315 struct ipv6_txoptions *opt;
319 /* hop-by-hop / destination options are privileged option */
321 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
324 if (optlen < sizeof(struct ipv6_opt_hdr) ||
325 optlen & 0x7 || optlen > 8 * 255)
328 opt = ipv6_renew_options(sk, np->opt, optname,
329 (struct ipv6_opt_hdr __user *)optval,
336 /* routing header option needs extra check */
337 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
338 struct ipv6_rt_hdr *rthdr = opt->srcrt;
339 switch (rthdr->type) {
340 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
341 case IPV6_SRCRT_TYPE_2:
348 if ((rthdr->hdrlen & 1) ||
349 (rthdr->hdrlen >> 1) != rthdr->segments_left)
354 if (inet_sk(sk)->is_icsk) {
356 struct inet_connection_sock *icsk = inet_csk(sk);
357 if (!((1 << sk->sk_state) &
358 (TCPF_LISTEN | TCPF_CLOSE))
359 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
360 icsk->icsk_ext_hdr_len =
361 opt->opt_flen + opt->opt_nflen;
362 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
365 opt = xchg(&np->opt, opt);
368 write_lock(&sk->sk_dst_lock);
369 opt = xchg(&np->opt, opt);
370 write_unlock(&sk->sk_dst_lock);
375 sock_kfree_s(sk, opt, opt->tot_len);
379 case IPV6_2292PKTOPTIONS:
381 struct ipv6_txoptions *opt = NULL;
386 fl.fl6_flowlabel = 0;
387 fl.oif = sk->sk_bound_dev_if;
392 /* 1K is probably excessive
393 * 1K is surely not enough, 2K per standard header is 16K.
396 if (optlen > 64*1024)
399 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
404 memset(opt, 0, sizeof(*opt));
405 opt->tot_len = sizeof(*opt) + optlen;
407 if (copy_from_user(opt+1, optval, optlen))
410 msg.msg_controllen = optlen;
411 msg.msg_control = (void*)(opt+1);
413 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
418 if (inet_sk(sk)->is_icsk) {
420 struct inet_connection_sock *icsk = inet_csk(sk);
421 if (!((1 << sk->sk_state) &
422 (TCPF_LISTEN | TCPF_CLOSE))
423 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
424 icsk->icsk_ext_hdr_len =
425 opt->opt_flen + opt->opt_nflen;
426 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
429 opt = xchg(&np->opt, opt);
432 write_lock(&sk->sk_dst_lock);
433 opt = xchg(&np->opt, opt);
434 write_unlock(&sk->sk_dst_lock);
440 sock_kfree_s(sk, opt, opt->tot_len);
443 case IPV6_UNICAST_HOPS:
444 if (optlen < sizeof(int))
446 if (val > 255 || val < -1)
452 case IPV6_MULTICAST_HOPS:
453 if (sk->sk_type == SOCK_STREAM)
455 if (optlen < sizeof(int))
457 if (val > 255 || val < -1)
459 np->mcast_hops = val;
463 case IPV6_MULTICAST_LOOP:
464 if (optlen < sizeof(int))
466 np->mc_loop = valbool;
470 case IPV6_MULTICAST_IF:
471 if (sk->sk_type == SOCK_STREAM)
473 if (optlen < sizeof(int))
477 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
480 if (__dev_get_by_index(net, val) == NULL) {
488 case IPV6_ADD_MEMBERSHIP:
489 case IPV6_DROP_MEMBERSHIP:
491 struct ipv6_mreq mreq;
493 if (optlen < sizeof(struct ipv6_mreq))
497 if (inet_sk(sk)->is_icsk)
501 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
504 if (optname == IPV6_ADD_MEMBERSHIP)
505 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
507 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
510 case IPV6_JOIN_ANYCAST:
511 case IPV6_LEAVE_ANYCAST:
513 struct ipv6_mreq mreq;
515 if (optlen < sizeof(struct ipv6_mreq))
519 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
522 if (optname == IPV6_JOIN_ANYCAST)
523 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
525 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
528 case MCAST_JOIN_GROUP:
529 case MCAST_LEAVE_GROUP:
531 struct group_req greq;
532 struct sockaddr_in6 *psin6;
534 if (optlen < sizeof(struct group_req))
538 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
540 if (greq.gr_group.ss_family != AF_INET6) {
541 retv = -EADDRNOTAVAIL;
544 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
545 if (optname == MCAST_JOIN_GROUP)
546 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
549 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
553 case MCAST_JOIN_SOURCE_GROUP:
554 case MCAST_LEAVE_SOURCE_GROUP:
555 case MCAST_BLOCK_SOURCE:
556 case MCAST_UNBLOCK_SOURCE:
558 struct group_source_req greqs;
561 if (optlen < sizeof(struct group_source_req))
563 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
567 if (greqs.gsr_group.ss_family != AF_INET6 ||
568 greqs.gsr_source.ss_family != AF_INET6) {
569 retv = -EADDRNOTAVAIL;
572 if (optname == MCAST_BLOCK_SOURCE) {
573 omode = MCAST_EXCLUDE;
575 } else if (optname == MCAST_UNBLOCK_SOURCE) {
576 omode = MCAST_EXCLUDE;
578 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
579 struct sockaddr_in6 *psin6;
581 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
582 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
584 /* prior join w/ different source is ok */
585 if (retv && retv != -EADDRINUSE)
587 omode = MCAST_INCLUDE;
589 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
590 omode = MCAST_INCLUDE;
593 retv = ip6_mc_source(add, omode, sk, &greqs);
598 extern int sysctl_mld_max_msf;
599 struct group_filter *gsf;
601 if (optlen < GROUP_FILTER_SIZE(0))
603 if (optlen > sysctl_optmem_max) {
607 gsf = kmalloc(optlen,GFP_KERNEL);
613 if (copy_from_user(gsf, optval, optlen)) {
617 /* numsrc >= (4G-140)/128 overflow in 32 bits */
618 if (gsf->gf_numsrc >= 0x1ffffffU ||
619 gsf->gf_numsrc > sysctl_mld_max_msf) {
624 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
629 retv = ip6_mc_msfilter(sk, gsf);
634 case IPV6_ROUTER_ALERT:
635 if (optlen < sizeof(int))
637 retv = ip6_ra_control(sk, val, NULL);
639 case IPV6_MTU_DISCOVER:
640 if (optlen < sizeof(int))
648 if (optlen < sizeof(int))
650 if (val && val < IPV6_MIN_MTU)
656 if (optlen < sizeof(int))
658 np->recverr = valbool;
660 skb_queue_purge(&sk->sk_error_queue);
663 case IPV6_FLOWINFO_SEND:
664 if (optlen < sizeof(int))
666 np->sndflow = valbool;
669 case IPV6_FLOWLABEL_MGR:
670 retv = ipv6_flowlabel_opt(sk, optval, optlen);
672 case IPV6_IPSEC_POLICY:
673 case IPV6_XFRM_POLICY:
675 if (!capable(CAP_NET_ADMIN))
677 retv = xfrm_user_policy(sk, optname, optval, optlen);
680 case IPV6_ADDR_PREFERENCES:
682 unsigned int pref = 0;
683 unsigned int prefmask = ~0;
685 if (optlen < sizeof(int))
690 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
691 switch (val & (IPV6_PREFER_SRC_PUBLIC|
693 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
694 case IPV6_PREFER_SRC_PUBLIC:
695 pref |= IPV6_PREFER_SRC_PUBLIC;
697 case IPV6_PREFER_SRC_TMP:
698 pref |= IPV6_PREFER_SRC_TMP;
700 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
703 goto pref_skip_pubtmp;
708 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
709 IPV6_PREFER_SRC_TMP);
712 /* check HOME/COA conflicts */
713 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
714 case IPV6_PREFER_SRC_HOME:
716 case IPV6_PREFER_SRC_COA:
717 pref |= IPV6_PREFER_SRC_COA;
724 prefmask &= ~IPV6_PREFER_SRC_COA;
727 /* check CGA/NONCGA conflicts */
728 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
729 case IPV6_PREFER_SRC_CGA:
730 case IPV6_PREFER_SRC_NONCGA:
737 np->srcprefs = (np->srcprefs & prefmask) | pref;
753 int ipv6_setsockopt(struct sock *sk, int level, int optname,
754 char __user *optval, int optlen)
758 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
759 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
761 if (level != SOL_IPV6)
764 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
765 #ifdef CONFIG_NETFILTER
766 /* we need to exclude all possible ENOPROTOOPTs except default case */
767 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
768 optname != IPV6_XFRM_POLICY) {
770 err = nf_setsockopt(sk, PF_INET6, optname, optval,
778 EXPORT_SYMBOL(ipv6_setsockopt);
781 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
782 char __user *optval, int optlen)
786 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
787 if (udp_prot.compat_setsockopt != NULL)
788 return udp_prot.compat_setsockopt(sk, level, optname,
790 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
793 if (level != SOL_IPV6)
796 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
797 #ifdef CONFIG_NETFILTER
798 /* we need to exclude all possible ENOPROTOOPTs except default case */
799 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
800 optname != IPV6_XFRM_POLICY) {
802 err = compat_nf_setsockopt(sk, PF_INET6, optname,
810 EXPORT_SYMBOL(compat_ipv6_setsockopt);
813 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
814 int optname, char __user *optval, int len)
816 struct ipv6_opt_hdr *hdr;
825 case IPV6_RTHDRDSTOPTS:
829 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
835 return -EINVAL; /* should not happen */
841 len = min_t(unsigned int, len, ipv6_optlen(hdr));
842 if (copy_to_user(optval, hdr, len))
844 return ipv6_optlen(hdr);
847 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
848 char __user *optval, int __user *optlen)
850 struct ipv6_pinfo *np = inet6_sk(sk);
854 if (ip6_mroute_opt(optname))
855 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
857 if (get_user(len, optlen))
861 if (sk->sk_protocol != IPPROTO_UDP &&
862 sk->sk_protocol != IPPROTO_UDPLITE &&
863 sk->sk_protocol != IPPROTO_TCP)
865 if (sk->sk_state != TCP_ESTABLISHED)
871 struct group_filter gsf;
874 if (len < GROUP_FILTER_SIZE(0))
876 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
879 err = ip6_mc_msfget(sk, &gsf,
880 (struct group_filter __user *)optval, optlen);
885 case IPV6_2292PKTOPTIONS:
890 if (sk->sk_type != SOCK_STREAM)
893 msg.msg_control = optval;
894 msg.msg_controllen = len;
898 skb = np->pktoptions;
900 atomic_inc(&skb->users);
904 int err = datagram_recv_ctl(sk, &msg, skb);
909 if (np->rxopt.bits.rxinfo) {
910 struct in6_pktinfo src_info;
911 src_info.ipi6_ifindex = np->mcast_oif;
912 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
913 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
915 if (np->rxopt.bits.rxhlim) {
916 int hlim = np->mcast_hops;
917 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
919 if (np->rxopt.bits.rxoinfo) {
920 struct in6_pktinfo src_info;
921 src_info.ipi6_ifindex = np->mcast_oif;
922 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
923 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
925 if (np->rxopt.bits.rxohlim) {
926 int hlim = np->mcast_hops;
927 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
930 len -= msg.msg_controllen;
931 return put_user(len, optlen);
935 struct dst_entry *dst;
938 dst = sk_dst_get(sk);
953 case IPV6_RECVPKTINFO:
954 val = np->rxopt.bits.rxinfo;
957 case IPV6_2292PKTINFO:
958 val = np->rxopt.bits.rxoinfo;
961 case IPV6_RECVHOPLIMIT:
962 val = np->rxopt.bits.rxhlim;
965 case IPV6_2292HOPLIMIT:
966 val = np->rxopt.bits.rxohlim;
970 val = np->rxopt.bits.srcrt;
974 val = np->rxopt.bits.osrcrt;
978 case IPV6_RTHDRDSTOPTS:
984 len = ipv6_getsockopt_sticky(sk, np->opt,
985 optname, optval, len);
987 return put_user(len, optlen);
990 case IPV6_RECVHOPOPTS:
991 val = np->rxopt.bits.hopopts;
994 case IPV6_2292HOPOPTS:
995 val = np->rxopt.bits.ohopopts;
998 case IPV6_RECVDSTOPTS:
999 val = np->rxopt.bits.dstopts;
1002 case IPV6_2292DSTOPTS:
1003 val = np->rxopt.bits.odstopts;
1012 case IPV6_RECVTCLASS:
1013 val = np->rxopt.bits.rxtclass;
1017 val = np->rxopt.bits.rxflow;
1020 case IPV6_UNICAST_HOPS:
1021 case IPV6_MULTICAST_HOPS:
1023 struct dst_entry *dst;
1025 if (optname == IPV6_UNICAST_HOPS)
1026 val = np->hop_limit;
1028 val = np->mcast_hops;
1030 dst = sk_dst_get(sk);
1033 val = ip6_dst_hoplimit(dst);
1037 val = ipv6_devconf.hop_limit;
1041 case IPV6_MULTICAST_LOOP:
1045 case IPV6_MULTICAST_IF:
1046 val = np->mcast_oif;
1049 case IPV6_MTU_DISCOVER:
1057 case IPV6_FLOWINFO_SEND:
1061 case IPV6_ADDR_PREFERENCES:
1064 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1065 val |= IPV6_PREFER_SRC_TMP;
1066 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1067 val |= IPV6_PREFER_SRC_PUBLIC;
1069 /* XXX: should we return system default? */
1070 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1073 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1074 val |= IPV6_PREFER_SRC_COA;
1076 val |= IPV6_PREFER_SRC_HOME;
1080 return -ENOPROTOOPT;
1082 len = min_t(unsigned int, sizeof(int), len);
1083 if(put_user(len, optlen))
1085 if(copy_to_user(optval,&val,len))
1090 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1091 char __user *optval, int __user *optlen)
1095 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1096 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1098 if(level != SOL_IPV6)
1099 return -ENOPROTOOPT;
1101 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1102 #ifdef CONFIG_NETFILTER
1103 /* we need to exclude all possible ENOPROTOOPTs except default case */
1104 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1107 if (get_user(len, optlen))
1111 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1115 err = put_user(len, optlen);
1121 EXPORT_SYMBOL(ipv6_getsockopt);
1123 #ifdef CONFIG_COMPAT
1124 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1125 char __user *optval, int __user *optlen)
1129 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1130 if (udp_prot.compat_getsockopt != NULL)
1131 return udp_prot.compat_getsockopt(sk, level, optname,
1133 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1136 if (level != SOL_IPV6)
1137 return -ENOPROTOOPT;
1139 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1140 #ifdef CONFIG_NETFILTER
1141 /* we need to exclude all possible ENOPROTOOPTs except default case */
1142 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1145 if (get_user(len, optlen))
1149 err = compat_nf_getsockopt(sk, PF_INET6,
1150 optname, optval, &len);
1153 err = put_user(len, optlen);
1159 EXPORT_SYMBOL(compat_ipv6_getsockopt);