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 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
15 * FIXME: Make the setsockopt code POSIX compliant: That is
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/mroute6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
51 #include <net/udplite.h>
53 #include <net/compat.h>
55 #include <asm/uaccess.h>
57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
62 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
64 struct ip6_ra_chain *ra, *new_ra, **rap;
66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
70 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
76 write_unlock_bh(&ip6_ra_lock);
82 write_unlock_bh(&ip6_ra_lock);
92 write_unlock_bh(&ip6_ra_lock);
97 new_ra->destructor = destructor;
101 write_unlock_bh(&ip6_ra_lock);
106 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
107 struct ipv6_txoptions *opt)
109 if (inet_sk(sk)->is_icsk) {
111 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
112 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
113 struct inet_connection_sock *icsk = inet_csk(sk);
114 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
115 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
117 opt = xchg(&inet6_sk(sk)->opt, opt);
119 write_lock(&sk->sk_dst_lock);
120 opt = xchg(&inet6_sk(sk)->opt, opt);
121 write_unlock(&sk->sk_dst_lock);
128 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
129 char __user *optval, int optlen)
131 struct ipv6_pinfo *np = inet6_sk(sk);
132 struct net *net = sock_net(sk);
134 int retv = -ENOPROTOOPT;
139 if (optlen >= sizeof(int)) {
140 if (get_user(val, (int __user *) optval))
148 if (ip6_mroute_opt(optname))
149 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
156 if (optlen < sizeof(int))
158 if (val == PF_INET) {
159 struct ipv6_txoptions *opt;
160 struct sk_buff *pktopt;
162 if (sk->sk_type == SOCK_RAW)
165 if (sk->sk_protocol == IPPROTO_UDP ||
166 sk->sk_protocol == IPPROTO_UDPLITE) {
167 struct udp_sock *up = udp_sk(sk);
168 if (up->pending == AF_INET6) {
172 } else if (sk->sk_protocol != IPPROTO_TCP)
175 if (sk->sk_state != TCP_ESTABLISHED) {
180 if (ipv6_only_sock(sk) ||
181 !ipv6_addr_v4mapped(&np->daddr)) {
182 retv = -EADDRNOTAVAIL;
186 fl6_free_socklist(sk);
187 ipv6_sock_mc_close(sk);
190 * Sock is moving from IPv6 to IPv4 (sk_prot), so
191 * remove it from the refcnt debug socks count in the
194 sk_refcnt_debug_dec(sk);
196 if (sk->sk_protocol == IPPROTO_TCP) {
197 struct inet_connection_sock *icsk = inet_csk(sk);
199 sock_prot_inuse_add(net, sk->sk_prot, -1);
200 sock_prot_inuse_add(net, &tcp_prot, 1);
202 sk->sk_prot = &tcp_prot;
203 icsk->icsk_af_ops = &ipv4_specific;
204 sk->sk_socket->ops = &inet_stream_ops;
205 sk->sk_family = PF_INET;
206 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
208 struct proto *prot = &udp_prot;
210 if (sk->sk_protocol == IPPROTO_UDPLITE)
211 prot = &udplite_prot;
213 sock_prot_inuse_add(net, sk->sk_prot, -1);
214 sock_prot_inuse_add(net, prot, 1);
217 sk->sk_socket->ops = &inet_dgram_ops;
218 sk->sk_family = PF_INET;
220 opt = xchg(&np->opt, NULL);
222 sock_kfree_s(sk, opt, opt->tot_len);
223 pktopt = xchg(&np->pktoptions, NULL);
227 sk->sk_destruct = inet_sock_destruct;
229 * ... and add it to the refcnt debug socks count
230 * in the new family. -acme
232 sk_refcnt_debug_inc(sk);
233 module_put(THIS_MODULE);
240 if (optlen < sizeof(int) ||
243 np->ipv6only = valbool;
247 case IPV6_RECVPKTINFO:
248 if (optlen < sizeof(int))
250 np->rxopt.bits.rxinfo = valbool;
254 case IPV6_2292PKTINFO:
255 if (optlen < sizeof(int))
257 np->rxopt.bits.rxoinfo = valbool;
261 case IPV6_RECVHOPLIMIT:
262 if (optlen < sizeof(int))
264 np->rxopt.bits.rxhlim = valbool;
268 case IPV6_2292HOPLIMIT:
269 if (optlen < sizeof(int))
271 np->rxopt.bits.rxohlim = valbool;
276 if (optlen < sizeof(int))
278 np->rxopt.bits.srcrt = valbool;
283 if (optlen < sizeof(int))
285 np->rxopt.bits.osrcrt = valbool;
289 case IPV6_RECVHOPOPTS:
290 if (optlen < sizeof(int))
292 np->rxopt.bits.hopopts = valbool;
296 case IPV6_2292HOPOPTS:
297 if (optlen < sizeof(int))
299 np->rxopt.bits.ohopopts = valbool;
303 case IPV6_RECVDSTOPTS:
304 if (optlen < sizeof(int))
306 np->rxopt.bits.dstopts = valbool;
310 case IPV6_2292DSTOPTS:
311 if (optlen < sizeof(int))
313 np->rxopt.bits.odstopts = valbool;
318 if (optlen < sizeof(int))
320 if (val < -1 || val > 0xff)
326 case IPV6_RECVTCLASS:
327 if (optlen < sizeof(int))
329 np->rxopt.bits.rxtclass = valbool;
334 if (optlen < sizeof(int))
336 np->rxopt.bits.rxflow = valbool;
341 case IPV6_RTHDRDSTOPTS:
345 struct ipv6_txoptions *opt;
347 /* remove any sticky options header with a zero option
348 * length, per RFC3542.
352 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
353 optlen & 0x7 || optlen > 8 * 255)
356 /* hop-by-hop / destination options are privileged option */
358 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
361 opt = ipv6_renew_options(sk, np->opt, optname,
362 (struct ipv6_opt_hdr __user *)optval,
369 /* routing header option needs extra check */
370 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
371 struct ipv6_rt_hdr *rthdr = opt->srcrt;
372 switch (rthdr->type) {
373 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
374 case IPV6_SRCRT_TYPE_2:
381 if ((rthdr->hdrlen & 1) ||
382 (rthdr->hdrlen >> 1) != rthdr->segments_left)
387 opt = ipv6_update_options(sk, opt);
390 sock_kfree_s(sk, opt, opt->tot_len);
394 case IPV6_2292PKTOPTIONS:
396 struct ipv6_txoptions *opt = NULL;
401 fl.fl6_flowlabel = 0;
402 fl.oif = sk->sk_bound_dev_if;
407 /* 1K is probably excessive
408 * 1K is surely not enough, 2K per standard header is 16K.
411 if (optlen > 64*1024)
414 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
419 memset(opt, 0, sizeof(*opt));
420 opt->tot_len = sizeof(*opt) + optlen;
422 if (copy_from_user(opt+1, optval, optlen))
425 msg.msg_controllen = optlen;
426 msg.msg_control = (void*)(opt+1);
428 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
433 opt = ipv6_update_options(sk, opt);
436 sock_kfree_s(sk, opt, opt->tot_len);
439 case IPV6_UNICAST_HOPS:
440 if (optlen < sizeof(int))
442 if (val > 255 || val < -1)
448 case IPV6_MULTICAST_HOPS:
449 if (sk->sk_type == SOCK_STREAM)
451 if (optlen < sizeof(int))
453 if (val > 255 || val < -1)
455 np->mcast_hops = val;
459 case IPV6_MULTICAST_LOOP:
460 if (optlen < sizeof(int))
464 np->mc_loop = valbool;
468 case IPV6_MULTICAST_IF:
469 if (sk->sk_type == SOCK_STREAM)
471 if (optlen < sizeof(int))
475 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
478 if (__dev_get_by_index(net, val) == NULL) {
486 case IPV6_ADD_MEMBERSHIP:
487 case IPV6_DROP_MEMBERSHIP:
489 struct ipv6_mreq mreq;
491 if (optlen < sizeof(struct ipv6_mreq))
495 if (inet_sk(sk)->is_icsk)
499 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
502 if (optname == IPV6_ADD_MEMBERSHIP)
503 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
505 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
508 case IPV6_JOIN_ANYCAST:
509 case IPV6_LEAVE_ANYCAST:
511 struct ipv6_mreq mreq;
513 if (optlen < sizeof(struct ipv6_mreq))
517 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
520 if (optname == IPV6_JOIN_ANYCAST)
521 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
523 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
526 case MCAST_JOIN_GROUP:
527 case MCAST_LEAVE_GROUP:
529 struct group_req greq;
530 struct sockaddr_in6 *psin6;
532 if (optlen < sizeof(struct group_req))
536 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
538 if (greq.gr_group.ss_family != AF_INET6) {
539 retv = -EADDRNOTAVAIL;
542 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
543 if (optname == MCAST_JOIN_GROUP)
544 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
547 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
551 case MCAST_JOIN_SOURCE_GROUP:
552 case MCAST_LEAVE_SOURCE_GROUP:
553 case MCAST_BLOCK_SOURCE:
554 case MCAST_UNBLOCK_SOURCE:
556 struct group_source_req greqs;
559 if (optlen < sizeof(struct group_source_req))
561 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
565 if (greqs.gsr_group.ss_family != AF_INET6 ||
566 greqs.gsr_source.ss_family != AF_INET6) {
567 retv = -EADDRNOTAVAIL;
570 if (optname == MCAST_BLOCK_SOURCE) {
571 omode = MCAST_EXCLUDE;
573 } else if (optname == MCAST_UNBLOCK_SOURCE) {
574 omode = MCAST_EXCLUDE;
576 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
577 struct sockaddr_in6 *psin6;
579 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
580 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
582 /* prior join w/ different source is ok */
583 if (retv && retv != -EADDRINUSE)
585 omode = MCAST_INCLUDE;
587 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
588 omode = MCAST_INCLUDE;
591 retv = ip6_mc_source(add, omode, sk, &greqs);
596 extern int sysctl_mld_max_msf;
597 struct group_filter *gsf;
599 if (optlen < GROUP_FILTER_SIZE(0))
601 if (optlen > sysctl_optmem_max) {
605 gsf = kmalloc(optlen,GFP_KERNEL);
611 if (copy_from_user(gsf, optval, optlen)) {
615 /* numsrc >= (4G-140)/128 overflow in 32 bits */
616 if (gsf->gf_numsrc >= 0x1ffffffU ||
617 gsf->gf_numsrc > sysctl_mld_max_msf) {
622 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
627 retv = ip6_mc_msfilter(sk, gsf);
632 case IPV6_ROUTER_ALERT:
633 if (optlen < sizeof(int))
635 retv = ip6_ra_control(sk, val, NULL);
637 case IPV6_MTU_DISCOVER:
638 if (optlen < sizeof(int))
646 if (optlen < sizeof(int))
648 if (val && val < IPV6_MIN_MTU)
654 if (optlen < sizeof(int))
656 np->recverr = valbool;
658 skb_queue_purge(&sk->sk_error_queue);
661 case IPV6_FLOWINFO_SEND:
662 if (optlen < sizeof(int))
664 np->sndflow = valbool;
667 case IPV6_FLOWLABEL_MGR:
668 retv = ipv6_flowlabel_opt(sk, optval, optlen);
670 case IPV6_IPSEC_POLICY:
671 case IPV6_XFRM_POLICY:
673 if (!capable(CAP_NET_ADMIN))
675 retv = xfrm_user_policy(sk, optname, optval, optlen);
678 case IPV6_ADDR_PREFERENCES:
680 unsigned int pref = 0;
681 unsigned int prefmask = ~0;
683 if (optlen < sizeof(int))
688 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
689 switch (val & (IPV6_PREFER_SRC_PUBLIC|
691 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
692 case IPV6_PREFER_SRC_PUBLIC:
693 pref |= IPV6_PREFER_SRC_PUBLIC;
695 case IPV6_PREFER_SRC_TMP:
696 pref |= IPV6_PREFER_SRC_TMP;
698 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
701 goto pref_skip_pubtmp;
706 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
707 IPV6_PREFER_SRC_TMP);
710 /* check HOME/COA conflicts */
711 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
712 case IPV6_PREFER_SRC_HOME:
714 case IPV6_PREFER_SRC_COA:
715 pref |= IPV6_PREFER_SRC_COA;
722 prefmask &= ~IPV6_PREFER_SRC_COA;
725 /* check CGA/NONCGA conflicts */
726 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
727 case IPV6_PREFER_SRC_CGA:
728 case IPV6_PREFER_SRC_NONCGA:
735 np->srcprefs = (np->srcprefs & prefmask) | pref;
751 int ipv6_setsockopt(struct sock *sk, int level, int optname,
752 char __user *optval, int optlen)
756 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
757 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
759 if (level != SOL_IPV6)
762 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
763 #ifdef CONFIG_NETFILTER
764 /* we need to exclude all possible ENOPROTOOPTs except default case */
765 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
766 optname != IPV6_XFRM_POLICY) {
768 err = nf_setsockopt(sk, PF_INET6, optname, optval,
776 EXPORT_SYMBOL(ipv6_setsockopt);
779 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
780 char __user *optval, int optlen)
784 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
785 if (udp_prot.compat_setsockopt != NULL)
786 return udp_prot.compat_setsockopt(sk, level, optname,
788 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
791 if (level != SOL_IPV6)
794 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
795 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
798 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
799 #ifdef CONFIG_NETFILTER
800 /* we need to exclude all possible ENOPROTOOPTs except default case */
801 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
802 optname != IPV6_XFRM_POLICY) {
804 err = compat_nf_setsockopt(sk, PF_INET6, optname,
812 EXPORT_SYMBOL(compat_ipv6_setsockopt);
815 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
816 int optname, char __user *optval, int len)
818 struct ipv6_opt_hdr *hdr;
827 case IPV6_RTHDRDSTOPTS:
831 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
837 return -EINVAL; /* should not happen */
843 len = min_t(unsigned int, len, ipv6_optlen(hdr));
844 if (copy_to_user(optval, hdr, len))
849 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
850 char __user *optval, int __user *optlen)
852 struct ipv6_pinfo *np = inet6_sk(sk);
856 if (ip6_mroute_opt(optname))
857 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
859 if (get_user(len, optlen))
863 if (sk->sk_protocol != IPPROTO_UDP &&
864 sk->sk_protocol != IPPROTO_UDPLITE &&
865 sk->sk_protocol != IPPROTO_TCP)
867 if (sk->sk_state != TCP_ESTABLISHED)
873 struct group_filter gsf;
876 if (len < GROUP_FILTER_SIZE(0))
878 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
880 if (gsf.gf_group.ss_family != AF_INET6)
881 return -EADDRNOTAVAIL;
883 err = ip6_mc_msfget(sk, &gsf,
884 (struct group_filter __user *)optval, optlen);
889 case IPV6_2292PKTOPTIONS:
894 if (sk->sk_type != SOCK_STREAM)
897 msg.msg_control = optval;
898 msg.msg_controllen = len;
902 skb = np->pktoptions;
904 atomic_inc(&skb->users);
908 int err = datagram_recv_ctl(sk, &msg, skb);
913 if (np->rxopt.bits.rxinfo) {
914 struct in6_pktinfo src_info;
915 src_info.ipi6_ifindex = np->mcast_oif;
916 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
917 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
919 if (np->rxopt.bits.rxhlim) {
920 int hlim = np->mcast_hops;
921 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
923 if (np->rxopt.bits.rxoinfo) {
924 struct in6_pktinfo src_info;
925 src_info.ipi6_ifindex = np->mcast_oif;
926 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
927 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
929 if (np->rxopt.bits.rxohlim) {
930 int hlim = np->mcast_hops;
931 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
934 len -= msg.msg_controllen;
935 return put_user(len, optlen);
939 struct dst_entry *dst;
942 dst = sk_dst_get(sk);
957 case IPV6_RECVPKTINFO:
958 val = np->rxopt.bits.rxinfo;
961 case IPV6_2292PKTINFO:
962 val = np->rxopt.bits.rxoinfo;
965 case IPV6_RECVHOPLIMIT:
966 val = np->rxopt.bits.rxhlim;
969 case IPV6_2292HOPLIMIT:
970 val = np->rxopt.bits.rxohlim;
974 val = np->rxopt.bits.srcrt;
978 val = np->rxopt.bits.osrcrt;
982 case IPV6_RTHDRDSTOPTS:
988 len = ipv6_getsockopt_sticky(sk, np->opt,
989 optname, optval, len);
991 /* check if ipv6_getsockopt_sticky() returns err code */
994 return put_user(len, optlen);
997 case IPV6_RECVHOPOPTS:
998 val = np->rxopt.bits.hopopts;
1001 case IPV6_2292HOPOPTS:
1002 val = np->rxopt.bits.ohopopts;
1005 case IPV6_RECVDSTOPTS:
1006 val = np->rxopt.bits.dstopts;
1009 case IPV6_2292DSTOPTS:
1010 val = np->rxopt.bits.odstopts;
1019 case IPV6_RECVTCLASS:
1020 val = np->rxopt.bits.rxtclass;
1024 val = np->rxopt.bits.rxflow;
1027 case IPV6_UNICAST_HOPS:
1028 case IPV6_MULTICAST_HOPS:
1030 struct dst_entry *dst;
1032 if (optname == IPV6_UNICAST_HOPS)
1033 val = np->hop_limit;
1035 val = np->mcast_hops;
1037 dst = sk_dst_get(sk);
1040 val = ip6_dst_hoplimit(dst);
1044 val = ipv6_devconf.hop_limit;
1048 case IPV6_MULTICAST_LOOP:
1052 case IPV6_MULTICAST_IF:
1053 val = np->mcast_oif;
1056 case IPV6_MTU_DISCOVER:
1064 case IPV6_FLOWINFO_SEND:
1068 case IPV6_ADDR_PREFERENCES:
1071 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1072 val |= IPV6_PREFER_SRC_TMP;
1073 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1074 val |= IPV6_PREFER_SRC_PUBLIC;
1076 /* XXX: should we return system default? */
1077 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1080 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1081 val |= IPV6_PREFER_SRC_COA;
1083 val |= IPV6_PREFER_SRC_HOME;
1087 return -ENOPROTOOPT;
1089 len = min_t(unsigned int, sizeof(int), len);
1090 if(put_user(len, optlen))
1092 if(copy_to_user(optval,&val,len))
1097 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1098 char __user *optval, int __user *optlen)
1102 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1103 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1105 if(level != SOL_IPV6)
1106 return -ENOPROTOOPT;
1108 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1109 #ifdef CONFIG_NETFILTER
1110 /* we need to exclude all possible ENOPROTOOPTs except default case */
1111 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1114 if (get_user(len, optlen))
1118 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1122 err = put_user(len, optlen);
1128 EXPORT_SYMBOL(ipv6_getsockopt);
1130 #ifdef CONFIG_COMPAT
1131 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1132 char __user *optval, int __user *optlen)
1136 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1137 if (udp_prot.compat_getsockopt != NULL)
1138 return udp_prot.compat_getsockopt(sk, level, optname,
1140 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1143 if (level != SOL_IPV6)
1144 return -ENOPROTOOPT;
1146 if (optname == MCAST_MSFILTER)
1147 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1150 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1151 #ifdef CONFIG_NETFILTER
1152 /* we need to exclude all possible ENOPROTOOPTs except default case */
1153 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1156 if (get_user(len, optlen))
1160 err = compat_nf_getsockopt(sk, PF_INET6,
1161 optname, optval, &len);
1164 err = put_user(len, optlen);
1170 EXPORT_SYMBOL(compat_ipv6_getsockopt);