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>
57 #include <linux/uaccess.h>
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
62 int ip6_ra_control(struct sock *sk, int sel)
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)->inet_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);
90 write_unlock_bh(&ip6_ra_lock);
98 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)
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
142 char __user *optval, unsigned int optlen)
144 struct ipv6_pinfo *np = inet6_sk(sk);
145 struct net *net = sock_net(sk);
147 int retv = -ENOPROTOOPT;
148 bool needs_rtnl = setsockopt_needs_rtnl(optname);
153 if (optlen >= sizeof(int)) {
154 if (get_user(val, (int __user *) optval))
160 valbool = (val != 0);
162 if (ip6_mroute_opt(optname))
163 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
172 if (optlen < sizeof(int))
174 if (val == PF_INET) {
175 struct ipv6_txoptions *opt;
176 struct sk_buff *pktopt;
178 if (sk->sk_type == SOCK_RAW)
181 if (sk->sk_protocol == IPPROTO_UDP ||
182 sk->sk_protocol == IPPROTO_UDPLITE) {
183 struct udp_sock *up = udp_sk(sk);
184 if (up->pending == AF_INET6) {
188 } else if (sk->sk_protocol != IPPROTO_TCP)
191 if (sk->sk_state != TCP_ESTABLISHED) {
196 if (ipv6_only_sock(sk) ||
197 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
198 retv = -EADDRNOTAVAIL;
202 fl6_free_socklist(sk);
203 __ipv6_sock_mc_close(sk);
206 * Sock is moving from IPv6 to IPv4 (sk_prot), so
207 * remove it from the refcnt debug socks count in the
210 sk_refcnt_debug_dec(sk);
212 if (sk->sk_protocol == IPPROTO_TCP) {
213 struct inet_connection_sock *icsk = inet_csk(sk);
215 sock_prot_inuse_add(net, sk->sk_prot, -1);
216 sock_prot_inuse_add(net, &tcp_prot, 1);
218 sk->sk_prot = &tcp_prot;
219 icsk->icsk_af_ops = &ipv4_specific;
220 sk->sk_socket->ops = &inet_stream_ops;
221 sk->sk_family = PF_INET;
222 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
224 struct proto *prot = &udp_prot;
226 if (sk->sk_protocol == IPPROTO_UDPLITE)
227 prot = &udplite_prot;
229 sock_prot_inuse_add(net, sk->sk_prot, -1);
230 sock_prot_inuse_add(net, prot, 1);
233 sk->sk_socket->ops = &inet_dgram_ops;
234 sk->sk_family = PF_INET;
236 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
239 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
242 pktopt = xchg(&np->pktoptions, NULL);
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;
381 if (optlen < sizeof(int))
383 /* we also don't have a separate freebind bit for IPV6 */
384 inet_sk(sk)->freebind = valbool;
388 case IPV6_RECVORIGDSTADDR:
389 if (optlen < sizeof(int))
391 np->rxopt.bits.rxorigdstaddr = valbool;
396 case IPV6_RTHDRDSTOPTS:
400 struct ipv6_txoptions *opt;
401 struct ipv6_opt_hdr *new = NULL;
403 /* hop-by-hop / destination options are privileged option */
405 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
408 /* remove any sticky options header with a zero option
409 * length, per RFC3542.
415 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
416 optlen & 0x7 || optlen > 8 * 255)
419 new = memdup_user(optval, optlen);
424 if (unlikely(ipv6_optlen(new) > optlen)) {
430 opt = rcu_dereference_protected(np->opt,
431 lockdep_sock_is_held(sk));
432 opt = ipv6_renew_options(sk, opt, optname, new);
439 /* routing header option needs extra check */
441 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
442 struct ipv6_rt_hdr *rthdr = opt->srcrt;
443 switch (rthdr->type) {
444 #if IS_ENABLED(CONFIG_IPV6_MIP6)
445 case IPV6_SRCRT_TYPE_2:
446 if (rthdr->hdrlen != 2 ||
447 rthdr->segments_left != 1)
452 case IPV6_SRCRT_TYPE_4:
454 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
457 if (!seg6_validate_srh(srh, optlen))
467 opt = ipv6_update_options(sk, opt);
470 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
478 struct in6_pktinfo pkt;
482 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
485 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
489 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
492 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
493 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
498 case IPV6_2292PKTOPTIONS:
500 struct ipv6_txoptions *opt = NULL;
503 struct ipcm6_cookie ipc6;
505 memset(&fl6, 0, sizeof(fl6));
506 fl6.flowi6_oif = sk->sk_bound_dev_if;
507 fl6.flowi6_mark = sk->sk_mark;
512 /* 1K is probably excessive
513 * 1K is surely not enough, 2K per standard header is 16K.
516 if (optlen > 64*1024)
519 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
524 memset(opt, 0, sizeof(*opt));
525 refcount_set(&opt->refcnt, 1);
526 opt->tot_len = sizeof(*opt) + optlen;
528 if (copy_from_user(opt+1, optval, optlen))
531 msg.msg_controllen = optlen;
532 msg.msg_control = (void *)(opt+1);
535 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
540 opt = ipv6_update_options(sk, opt);
543 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
548 case IPV6_UNICAST_HOPS:
549 if (optlen < sizeof(int))
551 if (val > 255 || val < -1)
557 case IPV6_MULTICAST_HOPS:
558 if (sk->sk_type == SOCK_STREAM)
560 if (optlen < sizeof(int))
562 if (val > 255 || val < -1)
564 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
568 case IPV6_MULTICAST_LOOP:
569 if (optlen < sizeof(int))
573 np->mc_loop = valbool;
577 case IPV6_UNICAST_IF:
579 struct net_device *dev = NULL;
582 if (optlen != sizeof(int))
585 ifindex = (__force int)ntohl((__force __be32)val);
592 dev = dev_get_by_index(net, ifindex);
593 retv = -EADDRNOTAVAIL;
599 if (sk->sk_bound_dev_if)
602 np->ucast_oif = ifindex;
607 case IPV6_MULTICAST_IF:
608 if (sk->sk_type == SOCK_STREAM)
610 if (optlen < sizeof(int))
614 struct net_device *dev;
619 dev = dev_get_by_index_rcu(net, val);
625 midx = l3mdev_master_ifindex_rcu(dev);
629 if (sk->sk_bound_dev_if &&
630 sk->sk_bound_dev_if != val &&
631 (!midx || midx != sk->sk_bound_dev_if))
637 case IPV6_ADD_MEMBERSHIP:
638 case IPV6_DROP_MEMBERSHIP:
640 struct ipv6_mreq mreq;
642 if (optlen < sizeof(struct ipv6_mreq))
646 if (inet_sk(sk)->is_icsk)
650 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
653 if (optname == IPV6_ADD_MEMBERSHIP)
654 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
656 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
659 case IPV6_JOIN_ANYCAST:
660 case IPV6_LEAVE_ANYCAST:
662 struct ipv6_mreq mreq;
664 if (optlen < sizeof(struct ipv6_mreq))
668 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
671 if (optname == IPV6_JOIN_ANYCAST)
672 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
674 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
677 case IPV6_MULTICAST_ALL:
678 if (optlen < sizeof(int))
680 np->mc_all = valbool;
684 case MCAST_JOIN_GROUP:
685 case MCAST_LEAVE_GROUP:
687 struct group_req greq;
688 struct sockaddr_in6 *psin6;
690 if (optlen < sizeof(struct group_req))
694 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
696 if (greq.gr_group.ss_family != AF_INET6) {
697 retv = -EADDRNOTAVAIL;
700 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
701 if (optname == MCAST_JOIN_GROUP)
702 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
705 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
709 case MCAST_JOIN_SOURCE_GROUP:
710 case MCAST_LEAVE_SOURCE_GROUP:
711 case MCAST_BLOCK_SOURCE:
712 case MCAST_UNBLOCK_SOURCE:
714 struct group_source_req greqs;
717 if (optlen < sizeof(struct group_source_req))
719 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
723 if (greqs.gsr_group.ss_family != AF_INET6 ||
724 greqs.gsr_source.ss_family != AF_INET6) {
725 retv = -EADDRNOTAVAIL;
728 if (optname == MCAST_BLOCK_SOURCE) {
729 omode = MCAST_EXCLUDE;
731 } else if (optname == MCAST_UNBLOCK_SOURCE) {
732 omode = MCAST_EXCLUDE;
734 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
735 struct sockaddr_in6 *psin6;
737 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
738 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
741 /* prior join w/ different source is ok */
742 if (retv && retv != -EADDRINUSE)
744 omode = MCAST_INCLUDE;
746 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
747 omode = MCAST_INCLUDE;
750 retv = ip6_mc_source(add, omode, sk, &greqs);
755 struct group_filter *gsf;
757 if (optlen < GROUP_FILTER_SIZE(0))
759 if (optlen > sysctl_optmem_max) {
763 gsf = memdup_user(optval, optlen);
768 /* numsrc >= (4G-140)/128 overflow in 32 bits */
769 if (gsf->gf_numsrc >= 0x1ffffffU ||
770 gsf->gf_numsrc > sysctl_mld_max_msf) {
775 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
780 retv = ip6_mc_msfilter(sk, gsf);
785 case IPV6_ROUTER_ALERT:
786 if (optlen < sizeof(int))
788 retv = ip6_ra_control(sk, val);
790 case IPV6_ROUTER_ALERT_ISOLATE:
791 if (optlen < sizeof(int))
793 np->rtalert_isolate = valbool;
796 case IPV6_MTU_DISCOVER:
797 if (optlen < sizeof(int))
799 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
805 if (optlen < sizeof(int))
807 if (val && val < IPV6_MIN_MTU)
813 if (optlen < sizeof(int))
815 np->recverr = valbool;
817 skb_queue_purge(&sk->sk_error_queue);
820 case IPV6_FLOWINFO_SEND:
821 if (optlen < sizeof(int))
823 np->sndflow = valbool;
826 case IPV6_FLOWLABEL_MGR:
827 retv = ipv6_flowlabel_opt(sk, optval, optlen);
829 case IPV6_IPSEC_POLICY:
830 case IPV6_XFRM_POLICY:
832 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
834 retv = xfrm_user_policy(sk, optname, optval, optlen);
837 case IPV6_ADDR_PREFERENCES:
839 unsigned int pref = 0;
840 unsigned int prefmask = ~0;
842 if (optlen < sizeof(int))
847 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
848 switch (val & (IPV6_PREFER_SRC_PUBLIC|
850 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
851 case IPV6_PREFER_SRC_PUBLIC:
852 pref |= IPV6_PREFER_SRC_PUBLIC;
854 case IPV6_PREFER_SRC_TMP:
855 pref |= IPV6_PREFER_SRC_TMP;
857 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
860 goto pref_skip_pubtmp;
865 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
866 IPV6_PREFER_SRC_TMP);
869 /* check HOME/COA conflicts */
870 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
871 case IPV6_PREFER_SRC_HOME:
873 case IPV6_PREFER_SRC_COA:
874 pref |= IPV6_PREFER_SRC_COA;
881 prefmask &= ~IPV6_PREFER_SRC_COA;
884 /* check CGA/NONCGA conflicts */
885 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
886 case IPV6_PREFER_SRC_CGA:
887 case IPV6_PREFER_SRC_NONCGA:
894 np->srcprefs = (np->srcprefs & prefmask) | pref;
899 case IPV6_MINHOPCOUNT:
900 if (optlen < sizeof(int))
902 if (val < 0 || val > 255)
904 np->min_hopcount = val;
908 np->dontfrag = valbool;
911 case IPV6_AUTOFLOWLABEL:
912 np->autoflowlabel = valbool;
913 np->autoflowlabel_set = 1;
916 case IPV6_RECVFRAGSIZE:
917 np->rxopt.bits.recvfragsize = valbool;
935 int ipv6_setsockopt(struct sock *sk, int level, int optname,
936 char __user *optval, unsigned int optlen)
940 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
941 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
943 if (level != SOL_IPV6)
946 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
947 #ifdef CONFIG_NETFILTER
948 /* we need to exclude all possible ENOPROTOOPTs except default case */
949 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
950 optname != IPV6_XFRM_POLICY)
951 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
955 EXPORT_SYMBOL(ipv6_setsockopt);
958 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
959 char __user *optval, unsigned int optlen)
963 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
964 if (udp_prot.compat_setsockopt != NULL)
965 return udp_prot.compat_setsockopt(sk, level, optname,
967 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
970 if (level != SOL_IPV6)
973 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
974 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
977 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
978 #ifdef CONFIG_NETFILTER
979 /* we need to exclude all possible ENOPROTOOPTs except default case */
980 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
981 optname != IPV6_XFRM_POLICY)
982 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
987 EXPORT_SYMBOL(compat_ipv6_setsockopt);
990 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
991 int optname, char __user *optval, int len)
993 struct ipv6_opt_hdr *hdr;
1002 case IPV6_RTHDRDSTOPTS:
1006 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1012 return -EINVAL; /* should not happen */
1018 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1019 if (copy_to_user(optval, hdr, len))
1024 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1025 char __user *optval, int __user *optlen, unsigned int flags)
1027 struct ipv6_pinfo *np = inet6_sk(sk);
1031 if (ip6_mroute_opt(optname))
1032 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1034 if (get_user(len, optlen))
1038 if (sk->sk_protocol != IPPROTO_UDP &&
1039 sk->sk_protocol != IPPROTO_UDPLITE &&
1040 sk->sk_protocol != IPPROTO_TCP)
1041 return -ENOPROTOOPT;
1042 if (sk->sk_state != TCP_ESTABLISHED)
1044 val = sk->sk_family;
1046 case MCAST_MSFILTER:
1048 struct group_filter gsf;
1051 if (len < GROUP_FILTER_SIZE(0))
1053 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1055 if (gsf.gf_group.ss_family != AF_INET6)
1056 return -EADDRNOTAVAIL;
1058 err = ip6_mc_msfget(sk, &gsf,
1059 (struct group_filter __user *)optval, optlen);
1064 case IPV6_2292PKTOPTIONS:
1067 struct sk_buff *skb;
1069 if (sk->sk_type != SOCK_STREAM)
1070 return -ENOPROTOOPT;
1072 msg.msg_control = optval;
1073 msg.msg_controllen = len;
1074 msg.msg_flags = flags;
1077 skb = np->pktoptions;
1079 ip6_datagram_recv_ctl(sk, &msg, skb);
1082 if (np->rxopt.bits.rxinfo) {
1083 struct in6_pktinfo src_info;
1084 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1085 np->sticky_pktinfo.ipi6_ifindex;
1086 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1087 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1089 if (np->rxopt.bits.rxhlim) {
1090 int hlim = np->mcast_hops;
1091 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1093 if (np->rxopt.bits.rxtclass) {
1094 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1096 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1098 if (np->rxopt.bits.rxoinfo) {
1099 struct in6_pktinfo src_info;
1100 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1101 np->sticky_pktinfo.ipi6_ifindex;
1102 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1103 np->sticky_pktinfo.ipi6_addr;
1104 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1106 if (np->rxopt.bits.rxohlim) {
1107 int hlim = np->mcast_hops;
1108 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1110 if (np->rxopt.bits.rxflow) {
1111 __be32 flowinfo = np->rcv_flowinfo;
1113 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1116 len -= msg.msg_controllen;
1117 return put_user(len, optlen);
1121 struct dst_entry *dst;
1125 dst = __sk_dst_get(sk);
1135 val = sk->sk_ipv6only;
1138 case IPV6_RECVPKTINFO:
1139 val = np->rxopt.bits.rxinfo;
1142 case IPV6_2292PKTINFO:
1143 val = np->rxopt.bits.rxoinfo;
1146 case IPV6_RECVHOPLIMIT:
1147 val = np->rxopt.bits.rxhlim;
1150 case IPV6_2292HOPLIMIT:
1151 val = np->rxopt.bits.rxohlim;
1154 case IPV6_RECVRTHDR:
1155 val = np->rxopt.bits.srcrt;
1158 case IPV6_2292RTHDR:
1159 val = np->rxopt.bits.osrcrt;
1163 case IPV6_RTHDRDSTOPTS:
1167 struct ipv6_txoptions *opt;
1170 opt = rcu_dereference_protected(np->opt,
1171 lockdep_sock_is_held(sk));
1172 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1174 /* check if ipv6_getsockopt_sticky() returns err code */
1177 return put_user(len, optlen);
1180 case IPV6_RECVHOPOPTS:
1181 val = np->rxopt.bits.hopopts;
1184 case IPV6_2292HOPOPTS:
1185 val = np->rxopt.bits.ohopopts;
1188 case IPV6_RECVDSTOPTS:
1189 val = np->rxopt.bits.dstopts;
1192 case IPV6_2292DSTOPTS:
1193 val = np->rxopt.bits.odstopts;
1200 case IPV6_RECVTCLASS:
1201 val = np->rxopt.bits.rxtclass;
1205 val = np->rxopt.bits.rxflow;
1208 case IPV6_RECVPATHMTU:
1209 val = np->rxopt.bits.rxpmtu;
1214 struct dst_entry *dst;
1215 struct ip6_mtuinfo mtuinfo;
1217 if (len < sizeof(mtuinfo))
1220 len = sizeof(mtuinfo);
1221 memset(&mtuinfo, 0, sizeof(mtuinfo));
1224 dst = __sk_dst_get(sk);
1226 mtuinfo.ip6m_mtu = dst_mtu(dst);
1228 if (!mtuinfo.ip6m_mtu)
1231 if (put_user(len, optlen))
1233 if (copy_to_user(optval, &mtuinfo, len))
1239 case IPV6_TRANSPARENT:
1240 val = inet_sk(sk)->transparent;
1244 val = inet_sk(sk)->freebind;
1247 case IPV6_RECVORIGDSTADDR:
1248 val = np->rxopt.bits.rxorigdstaddr;
1251 case IPV6_UNICAST_HOPS:
1252 case IPV6_MULTICAST_HOPS:
1254 struct dst_entry *dst;
1256 if (optname == IPV6_UNICAST_HOPS)
1257 val = np->hop_limit;
1259 val = np->mcast_hops;
1263 dst = __sk_dst_get(sk);
1265 val = ip6_dst_hoplimit(dst);
1270 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1274 case IPV6_MULTICAST_LOOP:
1278 case IPV6_MULTICAST_IF:
1279 val = np->mcast_oif;
1282 case IPV6_MULTICAST_ALL:
1286 case IPV6_UNICAST_IF:
1287 val = (__force int)htonl((__u32) np->ucast_oif);
1290 case IPV6_MTU_DISCOVER:
1298 case IPV6_FLOWINFO_SEND:
1302 case IPV6_FLOWLABEL_MGR:
1304 struct in6_flowlabel_req freq;
1307 if (len < sizeof(freq))
1310 if (copy_from_user(&freq, optval, sizeof(freq)))
1313 if (freq.flr_action != IPV6_FL_A_GET)
1317 flags = freq.flr_flags;
1319 memset(&freq, 0, sizeof(freq));
1321 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1325 if (put_user(len, optlen))
1327 if (copy_to_user(optval, &freq, len))
1333 case IPV6_ADDR_PREFERENCES:
1336 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1337 val |= IPV6_PREFER_SRC_TMP;
1338 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1339 val |= IPV6_PREFER_SRC_PUBLIC;
1341 /* XXX: should we return system default? */
1342 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1345 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1346 val |= IPV6_PREFER_SRC_COA;
1348 val |= IPV6_PREFER_SRC_HOME;
1351 case IPV6_MINHOPCOUNT:
1352 val = np->min_hopcount;
1359 case IPV6_AUTOFLOWLABEL:
1360 val = ip6_autoflowlabel(sock_net(sk), np);
1363 case IPV6_RECVFRAGSIZE:
1364 val = np->rxopt.bits.recvfragsize;
1367 case IPV6_ROUTER_ALERT_ISOLATE:
1368 val = np->rtalert_isolate;
1372 return -ENOPROTOOPT;
1374 len = min_t(unsigned int, sizeof(int), len);
1375 if (put_user(len, optlen))
1377 if (copy_to_user(optval, &val, len))
1382 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1383 char __user *optval, int __user *optlen)
1387 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1388 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1390 if (level != SOL_IPV6)
1391 return -ENOPROTOOPT;
1393 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1394 #ifdef CONFIG_NETFILTER
1395 /* we need to exclude all possible ENOPROTOOPTs except default case */
1396 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1399 if (get_user(len, optlen))
1402 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1404 err = put_user(len, optlen);
1409 EXPORT_SYMBOL(ipv6_getsockopt);
1411 #ifdef CONFIG_COMPAT
1412 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1413 char __user *optval, int __user *optlen)
1417 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1418 if (udp_prot.compat_getsockopt != NULL)
1419 return udp_prot.compat_getsockopt(sk, level, optname,
1421 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1424 if (level != SOL_IPV6)
1425 return -ENOPROTOOPT;
1427 if (optname == MCAST_MSFILTER)
1428 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1431 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1433 #ifdef CONFIG_NETFILTER
1434 /* we need to exclude all possible ENOPROTOOPTs except default case */
1435 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1438 if (get_user(len, optlen))
1441 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1443 err = put_user(len, optlen);
1448 EXPORT_SYMBOL(compat_ipv6_getsockopt);