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>
55 #include <net/compat.h>
57 #include <asm/uaccess.h>
59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
61 struct ip6_ra_chain *ip6_ra_chain;
62 DEFINE_RWLOCK(ip6_ra_lock);
64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
66 struct ip6_ra_chain *ra, *new_ra, **rap;
68 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
69 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
72 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
74 write_lock_bh(&ip6_ra_lock);
75 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
78 write_unlock_bh(&ip6_ra_lock);
84 write_unlock_bh(&ip6_ra_lock);
94 write_unlock_bh(&ip6_ra_lock);
99 new_ra->destructor = destructor;
103 write_unlock_bh(&ip6_ra_lock);
108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
109 struct ipv6_txoptions *opt)
111 if (inet_sk(sk)->is_icsk) {
113 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
114 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
115 struct inet_connection_sock *icsk = inet_csk(sk);
116 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
117 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
119 opt = xchg(&inet6_sk(sk)->opt, opt);
121 write_lock(&sk->sk_dst_lock);
122 opt = xchg(&inet6_sk(sk)->opt, opt);
123 write_unlock(&sk->sk_dst_lock);
130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
131 char __user *optval, int optlen)
133 struct ipv6_pinfo *np = inet6_sk(sk);
134 struct net *net = sock_net(sk);
136 int retv = -ENOPROTOOPT;
141 if (optlen >= sizeof(int)) {
142 if (get_user(val, (int __user *) optval))
150 if (ip6_mroute_opt(optname))
151 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
158 if (optlen < sizeof(int))
160 if (val == PF_INET) {
161 struct ipv6_txoptions *opt;
162 struct sk_buff *pktopt;
164 if (sk->sk_type == SOCK_RAW)
167 if (sk->sk_protocol == IPPROTO_UDP ||
168 sk->sk_protocol == IPPROTO_UDPLITE) {
169 struct udp_sock *up = udp_sk(sk);
170 if (up->pending == AF_INET6) {
174 } else if (sk->sk_protocol != IPPROTO_TCP)
177 if (sk->sk_state != TCP_ESTABLISHED) {
182 if (ipv6_only_sock(sk) ||
183 !ipv6_addr_v4mapped(&np->daddr)) {
184 retv = -EADDRNOTAVAIL;
188 fl6_free_socklist(sk);
189 ipv6_sock_mc_close(sk);
192 * Sock is moving from IPv6 to IPv4 (sk_prot), so
193 * remove it from the refcnt debug socks count in the
196 sk_refcnt_debug_dec(sk);
198 if (sk->sk_protocol == IPPROTO_TCP) {
199 struct inet_connection_sock *icsk = inet_csk(sk);
201 sock_prot_inuse_add(net, sk->sk_prot, -1);
202 sock_prot_inuse_add(net, &tcp_prot, 1);
204 sk->sk_prot = &tcp_prot;
205 icsk->icsk_af_ops = &ipv4_specific;
206 sk->sk_socket->ops = &inet_stream_ops;
207 sk->sk_family = PF_INET;
208 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
210 struct proto *prot = &udp_prot;
212 if (sk->sk_protocol == IPPROTO_UDPLITE)
213 prot = &udplite_prot;
215 sock_prot_inuse_add(net, sk->sk_prot, -1);
216 sock_prot_inuse_add(net, prot, 1);
219 sk->sk_socket->ops = &inet_dgram_ops;
220 sk->sk_family = PF_INET;
222 opt = xchg(&np->opt, NULL);
224 sock_kfree_s(sk, opt, opt->tot_len);
225 pktopt = xchg(&np->pktoptions, NULL);
229 sk->sk_destruct = inet_sock_destruct;
231 * ... and add it to the refcnt debug socks count
232 * in the new family. -acme
234 sk_refcnt_debug_inc(sk);
235 module_put(THIS_MODULE);
242 if (optlen < sizeof(int) ||
245 np->ipv6only = valbool;
249 case IPV6_RECVPKTINFO:
250 if (optlen < sizeof(int))
252 np->rxopt.bits.rxinfo = valbool;
256 case IPV6_2292PKTINFO:
257 if (optlen < sizeof(int))
259 np->rxopt.bits.rxoinfo = valbool;
263 case IPV6_RECVHOPLIMIT:
264 if (optlen < sizeof(int))
266 np->rxopt.bits.rxhlim = valbool;
270 case IPV6_2292HOPLIMIT:
271 if (optlen < sizeof(int))
273 np->rxopt.bits.rxohlim = valbool;
278 if (optlen < sizeof(int))
280 np->rxopt.bits.srcrt = valbool;
285 if (optlen < sizeof(int))
287 np->rxopt.bits.osrcrt = valbool;
291 case IPV6_RECVHOPOPTS:
292 if (optlen < sizeof(int))
294 np->rxopt.bits.hopopts = valbool;
298 case IPV6_2292HOPOPTS:
299 if (optlen < sizeof(int))
301 np->rxopt.bits.ohopopts = valbool;
305 case IPV6_RECVDSTOPTS:
306 if (optlen < sizeof(int))
308 np->rxopt.bits.dstopts = valbool;
312 case IPV6_2292DSTOPTS:
313 if (optlen < sizeof(int))
315 np->rxopt.bits.odstopts = valbool;
320 if (optlen < sizeof(int))
322 if (val < -1 || val > 0xff)
328 case IPV6_RECVTCLASS:
329 if (optlen < sizeof(int))
331 np->rxopt.bits.rxtclass = valbool;
336 if (optlen < sizeof(int))
338 np->rxopt.bits.rxflow = valbool;
343 case IPV6_RTHDRDSTOPTS:
347 struct ipv6_txoptions *opt;
351 /* hop-by-hop / destination options are privileged option */
353 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
356 if (optlen < sizeof(struct ipv6_opt_hdr) ||
357 optlen & 0x7 || optlen > 8 * 255)
360 opt = ipv6_renew_options(sk, np->opt, optname,
361 (struct ipv6_opt_hdr __user *)optval,
368 /* routing header option needs extra check */
369 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
370 struct ipv6_rt_hdr *rthdr = opt->srcrt;
371 switch (rthdr->type) {
372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
373 case IPV6_SRCRT_TYPE_2:
380 if ((rthdr->hdrlen & 1) ||
381 (rthdr->hdrlen >> 1) != rthdr->segments_left)
386 opt = ipv6_update_options(sk, opt);
389 sock_kfree_s(sk, opt, opt->tot_len);
393 case IPV6_2292PKTOPTIONS:
395 struct ipv6_txoptions *opt = NULL;
400 fl.fl6_flowlabel = 0;
401 fl.oif = sk->sk_bound_dev_if;
406 /* 1K is probably excessive
407 * 1K is surely not enough, 2K per standard header is 16K.
410 if (optlen > 64*1024)
413 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
418 memset(opt, 0, sizeof(*opt));
419 opt->tot_len = sizeof(*opt) + optlen;
421 if (copy_from_user(opt+1, optval, optlen))
424 msg.msg_controllen = optlen;
425 msg.msg_control = (void*)(opt+1);
427 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
432 opt = ipv6_update_options(sk, opt);
435 sock_kfree_s(sk, opt, opt->tot_len);
438 case IPV6_UNICAST_HOPS:
439 if (optlen < sizeof(int))
441 if (val > 255 || val < -1)
447 case IPV6_MULTICAST_HOPS:
448 if (sk->sk_type == SOCK_STREAM)
450 if (optlen < sizeof(int))
452 if (val > 255 || val < -1)
454 np->mcast_hops = val;
458 case IPV6_MULTICAST_LOOP:
459 if (optlen < sizeof(int))
461 np->mc_loop = valbool;
465 case IPV6_MULTICAST_IF:
466 if (sk->sk_type == SOCK_STREAM)
468 if (optlen < sizeof(int))
472 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
475 if (__dev_get_by_index(net, val) == NULL) {
483 case IPV6_ADD_MEMBERSHIP:
484 case IPV6_DROP_MEMBERSHIP:
486 struct ipv6_mreq mreq;
488 if (optlen < sizeof(struct ipv6_mreq))
492 if (inet_sk(sk)->is_icsk)
496 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
499 if (optname == IPV6_ADD_MEMBERSHIP)
500 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
502 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
505 case IPV6_JOIN_ANYCAST:
506 case IPV6_LEAVE_ANYCAST:
508 struct ipv6_mreq mreq;
510 if (optlen < sizeof(struct ipv6_mreq))
514 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
517 if (optname == IPV6_JOIN_ANYCAST)
518 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
520 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
523 case MCAST_JOIN_GROUP:
524 case MCAST_LEAVE_GROUP:
526 struct group_req greq;
527 struct sockaddr_in6 *psin6;
529 if (optlen < sizeof(struct group_req))
533 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
535 if (greq.gr_group.ss_family != AF_INET6) {
536 retv = -EADDRNOTAVAIL;
539 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
540 if (optname == MCAST_JOIN_GROUP)
541 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
544 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
548 case MCAST_JOIN_SOURCE_GROUP:
549 case MCAST_LEAVE_SOURCE_GROUP:
550 case MCAST_BLOCK_SOURCE:
551 case MCAST_UNBLOCK_SOURCE:
553 struct group_source_req greqs;
556 if (optlen < sizeof(struct group_source_req))
558 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
562 if (greqs.gsr_group.ss_family != AF_INET6 ||
563 greqs.gsr_source.ss_family != AF_INET6) {
564 retv = -EADDRNOTAVAIL;
567 if (optname == MCAST_BLOCK_SOURCE) {
568 omode = MCAST_EXCLUDE;
570 } else if (optname == MCAST_UNBLOCK_SOURCE) {
571 omode = MCAST_EXCLUDE;
573 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
574 struct sockaddr_in6 *psin6;
576 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
577 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
579 /* prior join w/ different source is ok */
580 if (retv && retv != -EADDRINUSE)
582 omode = MCAST_INCLUDE;
584 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
585 omode = MCAST_INCLUDE;
588 retv = ip6_mc_source(add, omode, sk, &greqs);
593 extern int sysctl_mld_max_msf;
594 struct group_filter *gsf;
596 if (optlen < GROUP_FILTER_SIZE(0))
598 if (optlen > sysctl_optmem_max) {
602 gsf = kmalloc(optlen,GFP_KERNEL);
608 if (copy_from_user(gsf, optval, optlen)) {
612 /* numsrc >= (4G-140)/128 overflow in 32 bits */
613 if (gsf->gf_numsrc >= 0x1ffffffU ||
614 gsf->gf_numsrc > sysctl_mld_max_msf) {
619 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
624 retv = ip6_mc_msfilter(sk, gsf);
629 case IPV6_ROUTER_ALERT:
630 if (optlen < sizeof(int))
632 retv = ip6_ra_control(sk, val, NULL);
634 case IPV6_MTU_DISCOVER:
635 if (optlen < sizeof(int))
643 if (optlen < sizeof(int))
645 if (val && val < IPV6_MIN_MTU)
651 if (optlen < sizeof(int))
653 np->recverr = valbool;
655 skb_queue_purge(&sk->sk_error_queue);
658 case IPV6_FLOWINFO_SEND:
659 if (optlen < sizeof(int))
661 np->sndflow = valbool;
664 case IPV6_FLOWLABEL_MGR:
665 retv = ipv6_flowlabel_opt(sk, optval, optlen);
667 case IPV6_IPSEC_POLICY:
668 case IPV6_XFRM_POLICY:
670 if (!capable(CAP_NET_ADMIN))
672 retv = xfrm_user_policy(sk, optname, optval, optlen);
675 case IPV6_ADDR_PREFERENCES:
677 unsigned int pref = 0;
678 unsigned int prefmask = ~0;
680 if (optlen < sizeof(int))
685 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
686 switch (val & (IPV6_PREFER_SRC_PUBLIC|
688 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
689 case IPV6_PREFER_SRC_PUBLIC:
690 pref |= IPV6_PREFER_SRC_PUBLIC;
692 case IPV6_PREFER_SRC_TMP:
693 pref |= IPV6_PREFER_SRC_TMP;
695 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
698 goto pref_skip_pubtmp;
703 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
704 IPV6_PREFER_SRC_TMP);
707 /* check HOME/COA conflicts */
708 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
709 case IPV6_PREFER_SRC_HOME:
711 case IPV6_PREFER_SRC_COA:
712 pref |= IPV6_PREFER_SRC_COA;
719 prefmask &= ~IPV6_PREFER_SRC_COA;
722 /* check CGA/NONCGA conflicts */
723 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
724 case IPV6_PREFER_SRC_CGA:
725 case IPV6_PREFER_SRC_NONCGA:
732 np->srcprefs = (np->srcprefs & prefmask) | pref;
748 int ipv6_setsockopt(struct sock *sk, int level, int optname,
749 char __user *optval, int optlen)
753 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
754 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
756 if (level != SOL_IPV6)
759 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
760 #ifdef CONFIG_NETFILTER
761 /* we need to exclude all possible ENOPROTOOPTs except default case */
762 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
763 optname != IPV6_XFRM_POLICY) {
765 err = nf_setsockopt(sk, PF_INET6, optname, optval,
773 EXPORT_SYMBOL(ipv6_setsockopt);
776 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
777 char __user *optval, int optlen)
781 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
782 if (udp_prot.compat_setsockopt != NULL)
783 return udp_prot.compat_setsockopt(sk, level, optname,
785 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
788 if (level != SOL_IPV6)
791 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
792 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
795 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
796 #ifdef CONFIG_NETFILTER
797 /* we need to exclude all possible ENOPROTOOPTs except default case */
798 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
799 optname != IPV6_XFRM_POLICY) {
801 err = compat_nf_setsockopt(sk, PF_INET6, optname,
809 EXPORT_SYMBOL(compat_ipv6_setsockopt);
812 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
813 int optname, char __user *optval, int len)
815 struct ipv6_opt_hdr *hdr;
824 case IPV6_RTHDRDSTOPTS:
828 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
834 return -EINVAL; /* should not happen */
840 len = min_t(unsigned int, len, ipv6_optlen(hdr));
841 if (copy_to_user(optval, hdr, len))
846 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
847 char __user *optval, int __user *optlen)
849 struct ipv6_pinfo *np = inet6_sk(sk);
853 if (ip6_mroute_opt(optname))
854 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
856 if (get_user(len, optlen))
860 if (sk->sk_protocol != IPPROTO_UDP &&
861 sk->sk_protocol != IPPROTO_UDPLITE &&
862 sk->sk_protocol != IPPROTO_TCP)
864 if (sk->sk_state != TCP_ESTABLISHED)
870 struct group_filter gsf;
873 if (len < GROUP_FILTER_SIZE(0))
875 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
878 err = ip6_mc_msfget(sk, &gsf,
879 (struct group_filter __user *)optval, optlen);
884 case IPV6_2292PKTOPTIONS:
889 if (sk->sk_type != SOCK_STREAM)
892 msg.msg_control = optval;
893 msg.msg_controllen = len;
897 skb = np->pktoptions;
899 atomic_inc(&skb->users);
903 int err = datagram_recv_ctl(sk, &msg, skb);
908 if (np->rxopt.bits.rxinfo) {
909 struct in6_pktinfo src_info;
910 src_info.ipi6_ifindex = np->mcast_oif;
911 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
912 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
914 if (np->rxopt.bits.rxhlim) {
915 int hlim = np->mcast_hops;
916 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
918 if (np->rxopt.bits.rxoinfo) {
919 struct in6_pktinfo src_info;
920 src_info.ipi6_ifindex = np->mcast_oif;
921 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
922 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
924 if (np->rxopt.bits.rxohlim) {
925 int hlim = np->mcast_hops;
926 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
929 len -= msg.msg_controllen;
930 return put_user(len, optlen);
934 struct dst_entry *dst;
937 dst = sk_dst_get(sk);
952 case IPV6_RECVPKTINFO:
953 val = np->rxopt.bits.rxinfo;
956 case IPV6_2292PKTINFO:
957 val = np->rxopt.bits.rxoinfo;
960 case IPV6_RECVHOPLIMIT:
961 val = np->rxopt.bits.rxhlim;
964 case IPV6_2292HOPLIMIT:
965 val = np->rxopt.bits.rxohlim;
969 val = np->rxopt.bits.srcrt;
973 val = np->rxopt.bits.osrcrt;
977 case IPV6_RTHDRDSTOPTS:
983 len = ipv6_getsockopt_sticky(sk, np->opt,
984 optname, optval, len);
986 /* check if ipv6_getsockopt_sticky() returns err code */
989 return put_user(len, optlen);
992 case IPV6_RECVHOPOPTS:
993 val = np->rxopt.bits.hopopts;
996 case IPV6_2292HOPOPTS:
997 val = np->rxopt.bits.ohopopts;
1000 case IPV6_RECVDSTOPTS:
1001 val = np->rxopt.bits.dstopts;
1004 case IPV6_2292DSTOPTS:
1005 val = np->rxopt.bits.odstopts;
1014 case IPV6_RECVTCLASS:
1015 val = np->rxopt.bits.rxtclass;
1019 val = np->rxopt.bits.rxflow;
1022 case IPV6_UNICAST_HOPS:
1023 case IPV6_MULTICAST_HOPS:
1025 struct dst_entry *dst;
1027 if (optname == IPV6_UNICAST_HOPS)
1028 val = np->hop_limit;
1030 val = np->mcast_hops;
1032 dst = sk_dst_get(sk);
1035 val = ip6_dst_hoplimit(dst);
1039 val = ipv6_devconf.hop_limit;
1043 case IPV6_MULTICAST_LOOP:
1047 case IPV6_MULTICAST_IF:
1048 val = np->mcast_oif;
1051 case IPV6_MTU_DISCOVER:
1059 case IPV6_FLOWINFO_SEND:
1063 case IPV6_ADDR_PREFERENCES:
1066 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1067 val |= IPV6_PREFER_SRC_TMP;
1068 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1069 val |= IPV6_PREFER_SRC_PUBLIC;
1071 /* XXX: should we return system default? */
1072 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1075 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1076 val |= IPV6_PREFER_SRC_COA;
1078 val |= IPV6_PREFER_SRC_HOME;
1082 return -ENOPROTOOPT;
1084 len = min_t(unsigned int, sizeof(int), len);
1085 if(put_user(len, optlen))
1087 if(copy_to_user(optval,&val,len))
1092 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1093 char __user *optval, int __user *optlen)
1097 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1098 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1100 if(level != SOL_IPV6)
1101 return -ENOPROTOOPT;
1103 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1104 #ifdef CONFIG_NETFILTER
1105 /* we need to exclude all possible ENOPROTOOPTs except default case */
1106 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1109 if (get_user(len, optlen))
1113 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1117 err = put_user(len, optlen);
1123 EXPORT_SYMBOL(ipv6_getsockopt);
1125 #ifdef CONFIG_COMPAT
1126 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1127 char __user *optval, int __user *optlen)
1131 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1132 if (udp_prot.compat_getsockopt != NULL)
1133 return udp_prot.compat_getsockopt(sk, level, optname,
1135 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1138 if (level != SOL_IPV6)
1139 return -ENOPROTOOPT;
1141 if (optname == MCAST_MSFILTER)
1142 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1145 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1146 #ifdef CONFIG_NETFILTER
1147 /* we need to exclude all possible ENOPROTOOPTs except default case */
1148 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1151 if (get_user(len, optlen))
1155 err = compat_nf_getsockopt(sk, PF_INET6,
1156 optname, optval, &len);
1159 err = put_user(len, optlen);
1165 EXPORT_SYMBOL(compat_ipv6_getsockopt);