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>
39 #include <linux/slab.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/transp_v6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/inet_common.h>
52 #include <net/udplite.h>
54 #include <net/compat.h>
56 #include <asm/uaccess.h>
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
61 int ip6_ra_control(struct sock *sk, int sel)
63 struct ip6_ra_chain *ra, *new_ra, **rap;
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
69 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
75 write_unlock_bh(&ip6_ra_lock);
81 write_unlock_bh(&ip6_ra_lock);
89 write_unlock_bh(&ip6_ra_lock);
97 write_unlock_bh(&ip6_ra_lock);
102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
105 if (inet_sk(sk)->is_icsk) {
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
121 static bool setsockopt_needs_rtnl(int optname)
124 case IPV6_ADD_MEMBERSHIP:
125 case IPV6_DROP_MEMBERSHIP:
126 case IPV6_JOIN_ANYCAST:
127 case IPV6_LEAVE_ANYCAST:
128 case MCAST_JOIN_GROUP:
129 case MCAST_LEAVE_GROUP:
130 case MCAST_JOIN_SOURCE_GROUP:
131 case MCAST_LEAVE_SOURCE_GROUP:
132 case MCAST_BLOCK_SOURCE:
133 case MCAST_UNBLOCK_SOURCE:
140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
141 char __user *optval, unsigned int optlen)
143 struct ipv6_pinfo *np = inet6_sk(sk);
144 struct net *net = sock_net(sk);
146 int retv = -ENOPROTOOPT;
147 bool needs_rtnl = setsockopt_needs_rtnl(optname);
152 if (optlen >= sizeof(int)) {
153 if (get_user(val, (int __user *) optval))
159 valbool = (val != 0);
161 if (ip6_mroute_opt(optname))
162 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
171 if (optlen < sizeof(int))
173 if (val == PF_INET) {
174 struct ipv6_txoptions *opt;
175 struct sk_buff *pktopt;
177 if (sk->sk_type == SOCK_RAW)
180 if (sk->sk_protocol == IPPROTO_UDP ||
181 sk->sk_protocol == IPPROTO_UDPLITE) {
182 struct udp_sock *up = udp_sk(sk);
183 if (up->pending == AF_INET6) {
187 } else if (sk->sk_protocol != IPPROTO_TCP)
190 if (sk->sk_state != TCP_ESTABLISHED) {
195 if (ipv6_only_sock(sk) ||
196 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
197 retv = -EADDRNOTAVAIL;
201 fl6_free_socklist(sk);
202 ipv6_sock_mc_close(sk);
205 * Sock is moving from IPv6 to IPv4 (sk_prot), so
206 * remove it from the refcnt debug socks count in the
209 sk_refcnt_debug_dec(sk);
211 if (sk->sk_protocol == IPPROTO_TCP) {
212 struct inet_connection_sock *icsk = inet_csk(sk);
214 sock_prot_inuse_add(net, sk->sk_prot, -1);
215 sock_prot_inuse_add(net, &tcp_prot, 1);
217 sk->sk_prot = &tcp_prot;
218 icsk->icsk_af_ops = &ipv4_specific;
219 sk->sk_socket->ops = &inet_stream_ops;
220 sk->sk_family = PF_INET;
221 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
223 struct proto *prot = &udp_prot;
225 if (sk->sk_protocol == IPPROTO_UDPLITE)
226 prot = &udplite_prot;
228 sock_prot_inuse_add(net, sk->sk_prot, -1);
229 sock_prot_inuse_add(net, prot, 1);
232 sk->sk_socket->ops = &inet_dgram_ops;
233 sk->sk_family = PF_INET;
235 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
238 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
241 pktopt = xchg(&np->pktoptions, NULL);
244 sk->sk_destruct = inet_sock_destruct;
246 * ... and add it to the refcnt debug socks count
247 * in the new family. -acme
249 sk_refcnt_debug_inc(sk);
250 module_put(THIS_MODULE);
257 if (optlen < sizeof(int) ||
258 inet_sk(sk)->inet_num)
260 sk->sk_ipv6only = valbool;
264 case IPV6_RECVPKTINFO:
265 if (optlen < sizeof(int))
267 np->rxopt.bits.rxinfo = valbool;
271 case IPV6_2292PKTINFO:
272 if (optlen < sizeof(int))
274 np->rxopt.bits.rxoinfo = valbool;
278 case IPV6_RECVHOPLIMIT:
279 if (optlen < sizeof(int))
281 np->rxopt.bits.rxhlim = valbool;
285 case IPV6_2292HOPLIMIT:
286 if (optlen < sizeof(int))
288 np->rxopt.bits.rxohlim = valbool;
293 if (optlen < sizeof(int))
295 np->rxopt.bits.srcrt = valbool;
300 if (optlen < sizeof(int))
302 np->rxopt.bits.osrcrt = valbool;
306 case IPV6_RECVHOPOPTS:
307 if (optlen < sizeof(int))
309 np->rxopt.bits.hopopts = valbool;
313 case IPV6_2292HOPOPTS:
314 if (optlen < sizeof(int))
316 np->rxopt.bits.ohopopts = valbool;
320 case IPV6_RECVDSTOPTS:
321 if (optlen < sizeof(int))
323 np->rxopt.bits.dstopts = valbool;
327 case IPV6_2292DSTOPTS:
328 if (optlen < sizeof(int))
330 np->rxopt.bits.odstopts = valbool;
335 if (optlen < sizeof(int))
337 if (val < -1 || val > 0xff)
339 /* RFC 3542, 6.5: default traffic class of 0x0 */
346 case IPV6_RECVTCLASS:
347 if (optlen < sizeof(int))
349 np->rxopt.bits.rxtclass = valbool;
354 if (optlen < sizeof(int))
356 np->rxopt.bits.rxflow = valbool;
360 case IPV6_RECVPATHMTU:
361 if (optlen < sizeof(int))
363 np->rxopt.bits.rxpmtu = valbool;
367 case IPV6_TRANSPARENT:
368 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
369 !ns_capable(net->user_ns, CAP_NET_RAW)) {
373 if (optlen < sizeof(int))
375 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
376 inet_sk(sk)->transparent = valbool;
380 case IPV6_RECVORIGDSTADDR:
381 if (optlen < sizeof(int))
383 np->rxopt.bits.rxorigdstaddr = valbool;
388 case IPV6_RTHDRDSTOPTS:
392 struct ipv6_txoptions *opt;
394 /* remove any sticky options header with a zero option
395 * length, per RFC3542.
401 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
402 optlen & 0x7 || optlen > 8 * 255)
405 /* hop-by-hop / destination options are privileged option */
407 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
410 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
411 opt = ipv6_renew_options(sk, opt, optname,
412 (struct ipv6_opt_hdr __user *)optval,
419 /* routing header option needs extra check */
421 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
422 struct ipv6_rt_hdr *rthdr = opt->srcrt;
423 switch (rthdr->type) {
424 #if IS_ENABLED(CONFIG_IPV6_MIP6)
425 case IPV6_SRCRT_TYPE_2:
426 if (rthdr->hdrlen != 2 ||
427 rthdr->segments_left != 1)
438 opt = ipv6_update_options(sk, opt);
441 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
449 struct in6_pktinfo pkt;
453 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
456 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
460 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
463 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
464 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
469 case IPV6_2292PKTOPTIONS:
471 struct ipv6_txoptions *opt = NULL;
476 memset(&fl6, 0, sizeof(fl6));
477 fl6.flowi6_oif = sk->sk_bound_dev_if;
478 fl6.flowi6_mark = sk->sk_mark;
483 /* 1K is probably excessive
484 * 1K is surely not enough, 2K per standard header is 16K.
487 if (optlen > 64*1024)
490 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
495 memset(opt, 0, sizeof(*opt));
496 atomic_set(&opt->refcnt, 1);
497 opt->tot_len = sizeof(*opt) + optlen;
499 if (copy_from_user(opt+1, optval, optlen))
502 msg.msg_controllen = optlen;
503 msg.msg_control = (void *)(opt+1);
505 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
511 opt = ipv6_update_options(sk, opt);
514 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
519 case IPV6_UNICAST_HOPS:
520 if (optlen < sizeof(int))
522 if (val > 255 || val < -1)
528 case IPV6_MULTICAST_HOPS:
529 if (sk->sk_type == SOCK_STREAM)
531 if (optlen < sizeof(int))
533 if (val > 255 || val < -1)
535 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
539 case IPV6_MULTICAST_LOOP:
540 if (optlen < sizeof(int))
544 np->mc_loop = valbool;
548 case IPV6_UNICAST_IF:
550 struct net_device *dev = NULL;
553 if (optlen != sizeof(int))
556 ifindex = (__force int)ntohl((__force __be32)val);
563 dev = dev_get_by_index(net, ifindex);
564 retv = -EADDRNOTAVAIL;
570 if (sk->sk_bound_dev_if)
573 np->ucast_oif = ifindex;
578 case IPV6_MULTICAST_IF:
579 if (sk->sk_type == SOCK_STREAM)
581 if (optlen < sizeof(int))
585 struct net_device *dev;
587 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
590 dev = dev_get_by_index(net, val);
600 case IPV6_ADD_MEMBERSHIP:
601 case IPV6_DROP_MEMBERSHIP:
603 struct ipv6_mreq mreq;
605 if (optlen < sizeof(struct ipv6_mreq))
609 if (inet_sk(sk)->is_icsk)
613 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
616 if (optname == IPV6_ADD_MEMBERSHIP)
617 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
619 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
622 case IPV6_JOIN_ANYCAST:
623 case IPV6_LEAVE_ANYCAST:
625 struct ipv6_mreq mreq;
627 if (optlen < sizeof(struct ipv6_mreq))
631 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
634 if (optname == IPV6_JOIN_ANYCAST)
635 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
637 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
640 case MCAST_JOIN_GROUP:
641 case MCAST_LEAVE_GROUP:
643 struct group_req greq;
644 struct sockaddr_in6 *psin6;
646 if (optlen < sizeof(struct group_req))
650 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
652 if (greq.gr_group.ss_family != AF_INET6) {
653 retv = -EADDRNOTAVAIL;
656 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
657 if (optname == MCAST_JOIN_GROUP)
658 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
661 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
665 case MCAST_JOIN_SOURCE_GROUP:
666 case MCAST_LEAVE_SOURCE_GROUP:
667 case MCAST_BLOCK_SOURCE:
668 case MCAST_UNBLOCK_SOURCE:
670 struct group_source_req greqs;
673 if (optlen < sizeof(struct group_source_req))
675 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
679 if (greqs.gsr_group.ss_family != AF_INET6 ||
680 greqs.gsr_source.ss_family != AF_INET6) {
681 retv = -EADDRNOTAVAIL;
684 if (optname == MCAST_BLOCK_SOURCE) {
685 omode = MCAST_EXCLUDE;
687 } else if (optname == MCAST_UNBLOCK_SOURCE) {
688 omode = MCAST_EXCLUDE;
690 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
691 struct sockaddr_in6 *psin6;
693 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
694 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
696 /* prior join w/ different source is ok */
697 if (retv && retv != -EADDRINUSE)
699 omode = MCAST_INCLUDE;
701 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
702 omode = MCAST_INCLUDE;
705 retv = ip6_mc_source(add, omode, sk, &greqs);
710 struct group_filter *gsf;
712 if (optlen < GROUP_FILTER_SIZE(0))
714 if (optlen > sysctl_optmem_max) {
718 gsf = kmalloc(optlen, GFP_KERNEL);
724 if (copy_from_user(gsf, optval, optlen)) {
728 /* numsrc >= (4G-140)/128 overflow in 32 bits */
729 if (gsf->gf_numsrc >= 0x1ffffffU ||
730 gsf->gf_numsrc > sysctl_mld_max_msf) {
735 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
740 retv = ip6_mc_msfilter(sk, gsf);
745 case IPV6_ROUTER_ALERT:
746 if (optlen < sizeof(int))
748 retv = ip6_ra_control(sk, val);
750 case IPV6_MTU_DISCOVER:
751 if (optlen < sizeof(int))
753 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
759 if (optlen < sizeof(int))
761 if (val && val < IPV6_MIN_MTU)
767 if (optlen < sizeof(int))
769 np->recverr = valbool;
771 skb_queue_purge(&sk->sk_error_queue);
774 case IPV6_FLOWINFO_SEND:
775 if (optlen < sizeof(int))
777 np->sndflow = valbool;
780 case IPV6_FLOWLABEL_MGR:
781 retv = ipv6_flowlabel_opt(sk, optval, optlen);
783 case IPV6_IPSEC_POLICY:
784 case IPV6_XFRM_POLICY:
786 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
788 retv = xfrm_user_policy(sk, optname, optval, optlen);
791 case IPV6_ADDR_PREFERENCES:
793 unsigned int pref = 0;
794 unsigned int prefmask = ~0;
796 if (optlen < sizeof(int))
801 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
802 switch (val & (IPV6_PREFER_SRC_PUBLIC|
804 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
805 case IPV6_PREFER_SRC_PUBLIC:
806 pref |= IPV6_PREFER_SRC_PUBLIC;
808 case IPV6_PREFER_SRC_TMP:
809 pref |= IPV6_PREFER_SRC_TMP;
811 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
814 goto pref_skip_pubtmp;
819 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
820 IPV6_PREFER_SRC_TMP);
823 /* check HOME/COA conflicts */
824 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
825 case IPV6_PREFER_SRC_HOME:
827 case IPV6_PREFER_SRC_COA:
828 pref |= IPV6_PREFER_SRC_COA;
835 prefmask &= ~IPV6_PREFER_SRC_COA;
838 /* check CGA/NONCGA conflicts */
839 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
840 case IPV6_PREFER_SRC_CGA:
841 case IPV6_PREFER_SRC_NONCGA:
848 np->srcprefs = (np->srcprefs & prefmask) | pref;
853 case IPV6_MINHOPCOUNT:
854 if (optlen < sizeof(int))
856 if (val < 0 || val > 255)
858 np->min_hopcount = val;
862 np->dontfrag = valbool;
865 case IPV6_AUTOFLOWLABEL:
866 np->autoflowlabel = valbool;
884 int ipv6_setsockopt(struct sock *sk, int level, int optname,
885 char __user *optval, unsigned int optlen)
889 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
890 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
892 if (level != SOL_IPV6)
895 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896 #ifdef CONFIG_NETFILTER
897 /* we need to exclude all possible ENOPROTOOPTs except default case */
898 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
899 optname != IPV6_XFRM_POLICY) {
901 err = nf_setsockopt(sk, PF_INET6, optname, optval,
908 EXPORT_SYMBOL(ipv6_setsockopt);
911 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
912 char __user *optval, unsigned int optlen)
916 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
917 if (udp_prot.compat_setsockopt != NULL)
918 return udp_prot.compat_setsockopt(sk, level, optname,
920 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
923 if (level != SOL_IPV6)
926 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
927 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
930 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
931 #ifdef CONFIG_NETFILTER
932 /* we need to exclude all possible ENOPROTOOPTs except default case */
933 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
934 optname != IPV6_XFRM_POLICY) {
936 err = compat_nf_setsockopt(sk, PF_INET6, optname,
943 EXPORT_SYMBOL(compat_ipv6_setsockopt);
946 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
947 int optname, char __user *optval, int len)
949 struct ipv6_opt_hdr *hdr;
958 case IPV6_RTHDRDSTOPTS:
962 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
968 return -EINVAL; /* should not happen */
974 len = min_t(unsigned int, len, ipv6_optlen(hdr));
975 if (copy_to_user(optval, hdr, len))
980 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
981 char __user *optval, int __user *optlen, unsigned int flags)
983 struct ipv6_pinfo *np = inet6_sk(sk);
987 if (ip6_mroute_opt(optname))
988 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
990 if (get_user(len, optlen))
994 if (sk->sk_protocol != IPPROTO_UDP &&
995 sk->sk_protocol != IPPROTO_UDPLITE &&
996 sk->sk_protocol != IPPROTO_TCP)
998 if (sk->sk_state != TCP_ESTABLISHED)
1000 val = sk->sk_family;
1002 case MCAST_MSFILTER:
1004 struct group_filter gsf;
1007 if (len < GROUP_FILTER_SIZE(0))
1009 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1011 if (gsf.gf_group.ss_family != AF_INET6)
1012 return -EADDRNOTAVAIL;
1014 err = ip6_mc_msfget(sk, &gsf,
1015 (struct group_filter __user *)optval, optlen);
1020 case IPV6_2292PKTOPTIONS:
1023 struct sk_buff *skb;
1025 if (sk->sk_type != SOCK_STREAM)
1026 return -ENOPROTOOPT;
1028 msg.msg_control = optval;
1029 msg.msg_controllen = len;
1030 msg.msg_flags = flags;
1033 skb = np->pktoptions;
1035 ip6_datagram_recv_ctl(sk, &msg, skb);
1038 if (np->rxopt.bits.rxinfo) {
1039 struct in6_pktinfo src_info;
1040 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1041 np->sticky_pktinfo.ipi6_ifindex;
1042 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1043 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1045 if (np->rxopt.bits.rxhlim) {
1046 int hlim = np->mcast_hops;
1047 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1049 if (np->rxopt.bits.rxtclass) {
1050 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1052 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1054 if (np->rxopt.bits.rxoinfo) {
1055 struct in6_pktinfo src_info;
1056 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1057 np->sticky_pktinfo.ipi6_ifindex;
1058 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1059 np->sticky_pktinfo.ipi6_addr;
1060 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1062 if (np->rxopt.bits.rxohlim) {
1063 int hlim = np->mcast_hops;
1064 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1066 if (np->rxopt.bits.rxflow) {
1067 __be32 flowinfo = np->rcv_flowinfo;
1069 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1072 len -= msg.msg_controllen;
1073 return put_user(len, optlen);
1077 struct dst_entry *dst;
1081 dst = __sk_dst_get(sk);
1091 val = sk->sk_ipv6only;
1094 case IPV6_RECVPKTINFO:
1095 val = np->rxopt.bits.rxinfo;
1098 case IPV6_2292PKTINFO:
1099 val = np->rxopt.bits.rxoinfo;
1102 case IPV6_RECVHOPLIMIT:
1103 val = np->rxopt.bits.rxhlim;
1106 case IPV6_2292HOPLIMIT:
1107 val = np->rxopt.bits.rxohlim;
1110 case IPV6_RECVRTHDR:
1111 val = np->rxopt.bits.srcrt;
1114 case IPV6_2292RTHDR:
1115 val = np->rxopt.bits.osrcrt;
1119 case IPV6_RTHDRDSTOPTS:
1123 struct ipv6_txoptions *opt;
1126 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1127 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1129 /* check if ipv6_getsockopt_sticky() returns err code */
1132 return put_user(len, optlen);
1135 case IPV6_RECVHOPOPTS:
1136 val = np->rxopt.bits.hopopts;
1139 case IPV6_2292HOPOPTS:
1140 val = np->rxopt.bits.ohopopts;
1143 case IPV6_RECVDSTOPTS:
1144 val = np->rxopt.bits.dstopts;
1147 case IPV6_2292DSTOPTS:
1148 val = np->rxopt.bits.odstopts;
1155 case IPV6_RECVTCLASS:
1156 val = np->rxopt.bits.rxtclass;
1160 val = np->rxopt.bits.rxflow;
1163 case IPV6_RECVPATHMTU:
1164 val = np->rxopt.bits.rxpmtu;
1169 struct dst_entry *dst;
1170 struct ip6_mtuinfo mtuinfo;
1172 if (len < sizeof(mtuinfo))
1175 len = sizeof(mtuinfo);
1176 memset(&mtuinfo, 0, sizeof(mtuinfo));
1179 dst = __sk_dst_get(sk);
1181 mtuinfo.ip6m_mtu = dst_mtu(dst);
1183 if (!mtuinfo.ip6m_mtu)
1186 if (put_user(len, optlen))
1188 if (copy_to_user(optval, &mtuinfo, len))
1194 case IPV6_TRANSPARENT:
1195 val = inet_sk(sk)->transparent;
1198 case IPV6_RECVORIGDSTADDR:
1199 val = np->rxopt.bits.rxorigdstaddr;
1202 case IPV6_UNICAST_HOPS:
1203 case IPV6_MULTICAST_HOPS:
1205 struct dst_entry *dst;
1207 if (optname == IPV6_UNICAST_HOPS)
1208 val = np->hop_limit;
1210 val = np->mcast_hops;
1214 dst = __sk_dst_get(sk);
1216 val = ip6_dst_hoplimit(dst);
1221 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1225 case IPV6_MULTICAST_LOOP:
1229 case IPV6_MULTICAST_IF:
1230 val = np->mcast_oif;
1233 case IPV6_UNICAST_IF:
1234 val = (__force int)htonl((__u32) np->ucast_oif);
1237 case IPV6_MTU_DISCOVER:
1245 case IPV6_FLOWINFO_SEND:
1249 case IPV6_FLOWLABEL_MGR:
1251 struct in6_flowlabel_req freq;
1254 if (len < sizeof(freq))
1257 if (copy_from_user(&freq, optval, sizeof(freq)))
1260 if (freq.flr_action != IPV6_FL_A_GET)
1264 flags = freq.flr_flags;
1266 memset(&freq, 0, sizeof(freq));
1268 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1272 if (put_user(len, optlen))
1274 if (copy_to_user(optval, &freq, len))
1280 case IPV6_ADDR_PREFERENCES:
1283 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1284 val |= IPV6_PREFER_SRC_TMP;
1285 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1286 val |= IPV6_PREFER_SRC_PUBLIC;
1288 /* XXX: should we return system default? */
1289 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1292 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1293 val |= IPV6_PREFER_SRC_COA;
1295 val |= IPV6_PREFER_SRC_HOME;
1298 case IPV6_MINHOPCOUNT:
1299 val = np->min_hopcount;
1306 case IPV6_AUTOFLOWLABEL:
1307 val = np->autoflowlabel;
1311 return -ENOPROTOOPT;
1313 len = min_t(unsigned int, sizeof(int), len);
1314 if (put_user(len, optlen))
1316 if (copy_to_user(optval, &val, len))
1321 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1322 char __user *optval, int __user *optlen)
1326 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1327 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1329 if (level != SOL_IPV6)
1330 return -ENOPROTOOPT;
1332 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1333 #ifdef CONFIG_NETFILTER
1334 /* we need to exclude all possible ENOPROTOOPTs except default case */
1335 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1338 if (get_user(len, optlen))
1342 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1346 err = put_user(len, optlen);
1351 EXPORT_SYMBOL(ipv6_getsockopt);
1353 #ifdef CONFIG_COMPAT
1354 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1355 char __user *optval, int __user *optlen)
1359 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1360 if (udp_prot.compat_getsockopt != NULL)
1361 return udp_prot.compat_getsockopt(sk, level, optname,
1363 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1366 if (level != SOL_IPV6)
1367 return -ENOPROTOOPT;
1369 if (optname == MCAST_MSFILTER)
1370 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1373 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1375 #ifdef CONFIG_NETFILTER
1376 /* we need to exclude all possible ENOPROTOOPTs except default case */
1377 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1380 if (get_user(len, optlen))
1384 err = compat_nf_getsockopt(sk, PF_INET6,
1385 optname, optval, &len);
1388 err = put_user(len, optlen);
1393 EXPORT_SYMBOL(compat_ipv6_getsockopt);