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) {
189 if (sk->sk_prot != &tcpv6_prot) {
197 if (sk->sk_state != TCP_ESTABLISHED) {
202 if (ipv6_only_sock(sk) ||
203 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
204 retv = -EADDRNOTAVAIL;
208 fl6_free_socklist(sk);
209 __ipv6_sock_mc_close(sk);
210 __ipv6_sock_ac_close(sk);
213 * Sock is moving from IPv6 to IPv4 (sk_prot), so
214 * remove it from the refcnt debug socks count in the
217 sk_refcnt_debug_dec(sk);
219 if (sk->sk_protocol == IPPROTO_TCP) {
220 struct inet_connection_sock *icsk = inet_csk(sk);
222 sock_prot_inuse_add(net, sk->sk_prot, -1);
223 sock_prot_inuse_add(net, &tcp_prot, 1);
225 sk->sk_prot = &tcp_prot;
226 icsk->icsk_af_ops = &ipv4_specific;
227 sk->sk_socket->ops = &inet_stream_ops;
228 sk->sk_family = PF_INET;
229 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
231 struct proto *prot = &udp_prot;
233 if (sk->sk_protocol == IPPROTO_UDPLITE)
234 prot = &udplite_prot;
236 sock_prot_inuse_add(net, sk->sk_prot, -1);
237 sock_prot_inuse_add(net, prot, 1);
240 sk->sk_socket->ops = &inet_dgram_ops;
241 sk->sk_family = PF_INET;
243 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
246 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
249 pktopt = xchg(&np->pktoptions, NULL);
253 * ... and add it to the refcnt debug socks count
254 * in the new family. -acme
256 sk_refcnt_debug_inc(sk);
257 module_put(THIS_MODULE);
264 if (optlen < sizeof(int) ||
265 inet_sk(sk)->inet_num)
267 sk->sk_ipv6only = valbool;
271 case IPV6_RECVPKTINFO:
272 if (optlen < sizeof(int))
274 np->rxopt.bits.rxinfo = valbool;
278 case IPV6_2292PKTINFO:
279 if (optlen < sizeof(int))
281 np->rxopt.bits.rxoinfo = valbool;
285 case IPV6_RECVHOPLIMIT:
286 if (optlen < sizeof(int))
288 np->rxopt.bits.rxhlim = valbool;
292 case IPV6_2292HOPLIMIT:
293 if (optlen < sizeof(int))
295 np->rxopt.bits.rxohlim = valbool;
300 if (optlen < sizeof(int))
302 np->rxopt.bits.srcrt = valbool;
307 if (optlen < sizeof(int))
309 np->rxopt.bits.osrcrt = valbool;
313 case IPV6_RECVHOPOPTS:
314 if (optlen < sizeof(int))
316 np->rxopt.bits.hopopts = valbool;
320 case IPV6_2292HOPOPTS:
321 if (optlen < sizeof(int))
323 np->rxopt.bits.ohopopts = valbool;
327 case IPV6_RECVDSTOPTS:
328 if (optlen < sizeof(int))
330 np->rxopt.bits.dstopts = valbool;
334 case IPV6_2292DSTOPTS:
335 if (optlen < sizeof(int))
337 np->rxopt.bits.odstopts = valbool;
342 if (optlen < sizeof(int))
344 if (val < -1 || val > 0xff)
346 /* RFC 3542, 6.5: default traffic class of 0x0 */
353 case IPV6_RECVTCLASS:
354 if (optlen < sizeof(int))
356 np->rxopt.bits.rxtclass = valbool;
361 if (optlen < sizeof(int))
363 np->rxopt.bits.rxflow = valbool;
367 case IPV6_RECVPATHMTU:
368 if (optlen < sizeof(int))
370 np->rxopt.bits.rxpmtu = valbool;
374 case IPV6_TRANSPARENT:
375 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
376 !ns_capable(net->user_ns, CAP_NET_RAW)) {
380 if (optlen < sizeof(int))
382 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
383 inet_sk(sk)->transparent = valbool;
387 case IPV6_RECVORIGDSTADDR:
388 if (optlen < sizeof(int))
390 np->rxopt.bits.rxorigdstaddr = valbool;
395 case IPV6_RTHDRDSTOPTS:
399 struct ipv6_txoptions *opt;
400 struct ipv6_opt_hdr *new = NULL;
402 /* hop-by-hop / destination options are privileged option */
404 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
407 /* remove any sticky options header with a zero option
408 * length, per RFC3542.
414 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
415 optlen & 0x7 || optlen > 8 * 255)
418 new = memdup_user(optval, optlen);
423 if (unlikely(ipv6_optlen(new) > optlen)) {
429 opt = rcu_dereference_protected(np->opt,
430 lockdep_sock_is_held(sk));
431 opt = ipv6_renew_options(sk, opt, optname, new);
438 /* routing header option needs extra check */
440 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
441 struct ipv6_rt_hdr *rthdr = opt->srcrt;
442 switch (rthdr->type) {
443 #if IS_ENABLED(CONFIG_IPV6_MIP6)
444 case IPV6_SRCRT_TYPE_2:
445 if (rthdr->hdrlen != 2 ||
446 rthdr->segments_left != 1)
451 case IPV6_SRCRT_TYPE_4:
453 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
456 if (!seg6_validate_srh(srh, optlen))
466 opt = ipv6_update_options(sk, opt);
469 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
477 struct in6_pktinfo pkt;
481 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
484 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
488 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
491 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
492 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
497 case IPV6_2292PKTOPTIONS:
499 struct ipv6_txoptions *opt = NULL;
502 struct sockcm_cookie sockc_junk;
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, &sockc_junk);
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 MCAST_JOIN_GROUP:
678 case MCAST_LEAVE_GROUP:
680 struct group_req greq;
681 struct sockaddr_in6 *psin6;
683 if (optlen < sizeof(struct group_req))
687 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
689 if (greq.gr_group.ss_family != AF_INET6) {
690 retv = -EADDRNOTAVAIL;
693 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
694 if (optname == MCAST_JOIN_GROUP)
695 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
698 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
702 case MCAST_JOIN_SOURCE_GROUP:
703 case MCAST_LEAVE_SOURCE_GROUP:
704 case MCAST_BLOCK_SOURCE:
705 case MCAST_UNBLOCK_SOURCE:
707 struct group_source_req greqs;
710 if (optlen < sizeof(struct group_source_req))
712 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
716 if (greqs.gsr_group.ss_family != AF_INET6 ||
717 greqs.gsr_source.ss_family != AF_INET6) {
718 retv = -EADDRNOTAVAIL;
721 if (optname == MCAST_BLOCK_SOURCE) {
722 omode = MCAST_EXCLUDE;
724 } else if (optname == MCAST_UNBLOCK_SOURCE) {
725 omode = MCAST_EXCLUDE;
727 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
728 struct sockaddr_in6 *psin6;
730 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
731 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
733 /* prior join w/ different source is ok */
734 if (retv && retv != -EADDRINUSE)
736 omode = MCAST_INCLUDE;
738 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
739 omode = MCAST_INCLUDE;
742 retv = ip6_mc_source(add, omode, sk, &greqs);
747 struct group_filter *gsf;
749 if (optlen < GROUP_FILTER_SIZE(0))
751 if (optlen > sysctl_optmem_max) {
755 gsf = memdup_user(optval, optlen);
760 /* numsrc >= (4G-140)/128 overflow in 32 bits */
761 if (gsf->gf_numsrc >= 0x1ffffffU ||
762 gsf->gf_numsrc > sysctl_mld_max_msf) {
767 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
772 retv = ip6_mc_msfilter(sk, gsf);
777 case IPV6_ROUTER_ALERT:
778 if (optlen < sizeof(int))
780 retv = ip6_ra_control(sk, val);
782 case IPV6_MTU_DISCOVER:
783 if (optlen < sizeof(int))
785 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
791 if (optlen < sizeof(int))
793 if (val && val < IPV6_MIN_MTU)
799 if (optlen < sizeof(int))
801 np->recverr = valbool;
803 skb_queue_purge(&sk->sk_error_queue);
806 case IPV6_FLOWINFO_SEND:
807 if (optlen < sizeof(int))
809 np->sndflow = valbool;
812 case IPV6_FLOWLABEL_MGR:
813 retv = ipv6_flowlabel_opt(sk, optval, optlen);
815 case IPV6_IPSEC_POLICY:
816 case IPV6_XFRM_POLICY:
818 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
820 retv = xfrm_user_policy(sk, optname, optval, optlen);
823 case IPV6_ADDR_PREFERENCES:
825 unsigned int pref = 0;
826 unsigned int prefmask = ~0;
828 if (optlen < sizeof(int))
833 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
834 switch (val & (IPV6_PREFER_SRC_PUBLIC|
836 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
837 case IPV6_PREFER_SRC_PUBLIC:
838 pref |= IPV6_PREFER_SRC_PUBLIC;
840 case IPV6_PREFER_SRC_TMP:
841 pref |= IPV6_PREFER_SRC_TMP;
843 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
846 goto pref_skip_pubtmp;
851 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
852 IPV6_PREFER_SRC_TMP);
855 /* check HOME/COA conflicts */
856 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
857 case IPV6_PREFER_SRC_HOME:
859 case IPV6_PREFER_SRC_COA:
860 pref |= IPV6_PREFER_SRC_COA;
867 prefmask &= ~IPV6_PREFER_SRC_COA;
870 /* check CGA/NONCGA conflicts */
871 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
872 case IPV6_PREFER_SRC_CGA:
873 case IPV6_PREFER_SRC_NONCGA:
880 np->srcprefs = (np->srcprefs & prefmask) | pref;
885 case IPV6_MINHOPCOUNT:
886 if (optlen < sizeof(int))
888 if (val < 0 || val > 255)
890 np->min_hopcount = val;
894 np->dontfrag = valbool;
897 case IPV6_AUTOFLOWLABEL:
898 np->autoflowlabel = valbool;
899 np->autoflowlabel_set = 1;
902 case IPV6_RECVFRAGSIZE:
903 np->rxopt.bits.recvfragsize = valbool;
921 int ipv6_setsockopt(struct sock *sk, int level, int optname,
922 char __user *optval, unsigned int optlen)
926 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
927 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
929 if (level != SOL_IPV6)
932 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
933 #ifdef CONFIG_NETFILTER
934 /* we need to exclude all possible ENOPROTOOPTs except default case */
935 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
936 optname != IPV6_XFRM_POLICY)
937 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
941 EXPORT_SYMBOL(ipv6_setsockopt);
944 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
945 char __user *optval, unsigned int optlen)
949 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
950 if (udp_prot.compat_setsockopt != NULL)
951 return udp_prot.compat_setsockopt(sk, level, optname,
953 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
956 if (level != SOL_IPV6)
959 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
960 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
963 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
964 #ifdef CONFIG_NETFILTER
965 /* we need to exclude all possible ENOPROTOOPTs except default case */
966 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
967 optname != IPV6_XFRM_POLICY)
968 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
973 EXPORT_SYMBOL(compat_ipv6_setsockopt);
976 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
977 int optname, char __user *optval, int len)
979 struct ipv6_opt_hdr *hdr;
988 case IPV6_RTHDRDSTOPTS:
992 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
998 return -EINVAL; /* should not happen */
1004 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1005 if (copy_to_user(optval, hdr, len))
1010 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1011 char __user *optval, int __user *optlen, unsigned int flags)
1013 struct ipv6_pinfo *np = inet6_sk(sk);
1017 if (ip6_mroute_opt(optname))
1018 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1020 if (get_user(len, optlen))
1024 if (sk->sk_protocol != IPPROTO_UDP &&
1025 sk->sk_protocol != IPPROTO_UDPLITE &&
1026 sk->sk_protocol != IPPROTO_TCP)
1027 return -ENOPROTOOPT;
1028 if (sk->sk_state != TCP_ESTABLISHED)
1030 val = sk->sk_family;
1032 case MCAST_MSFILTER:
1034 struct group_filter gsf;
1037 if (len < GROUP_FILTER_SIZE(0))
1039 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1041 if (gsf.gf_group.ss_family != AF_INET6)
1042 return -EADDRNOTAVAIL;
1044 err = ip6_mc_msfget(sk, &gsf,
1045 (struct group_filter __user *)optval, optlen);
1050 case IPV6_2292PKTOPTIONS:
1053 struct sk_buff *skb;
1055 if (sk->sk_type != SOCK_STREAM)
1056 return -ENOPROTOOPT;
1058 msg.msg_control = optval;
1059 msg.msg_controllen = len;
1060 msg.msg_flags = flags;
1063 skb = np->pktoptions;
1065 ip6_datagram_recv_ctl(sk, &msg, skb);
1068 if (np->rxopt.bits.rxinfo) {
1069 struct in6_pktinfo src_info;
1070 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1071 np->sticky_pktinfo.ipi6_ifindex;
1072 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1073 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1075 if (np->rxopt.bits.rxhlim) {
1076 int hlim = np->mcast_hops;
1077 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1079 if (np->rxopt.bits.rxtclass) {
1080 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1082 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1084 if (np->rxopt.bits.rxoinfo) {
1085 struct in6_pktinfo src_info;
1086 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1087 np->sticky_pktinfo.ipi6_ifindex;
1088 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1089 np->sticky_pktinfo.ipi6_addr;
1090 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1092 if (np->rxopt.bits.rxohlim) {
1093 int hlim = np->mcast_hops;
1094 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1096 if (np->rxopt.bits.rxflow) {
1097 __be32 flowinfo = np->rcv_flowinfo;
1099 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1102 len -= msg.msg_controllen;
1103 return put_user(len, optlen);
1107 struct dst_entry *dst;
1111 dst = __sk_dst_get(sk);
1121 val = sk->sk_ipv6only;
1124 case IPV6_RECVPKTINFO:
1125 val = np->rxopt.bits.rxinfo;
1128 case IPV6_2292PKTINFO:
1129 val = np->rxopt.bits.rxoinfo;
1132 case IPV6_RECVHOPLIMIT:
1133 val = np->rxopt.bits.rxhlim;
1136 case IPV6_2292HOPLIMIT:
1137 val = np->rxopt.bits.rxohlim;
1140 case IPV6_RECVRTHDR:
1141 val = np->rxopt.bits.srcrt;
1144 case IPV6_2292RTHDR:
1145 val = np->rxopt.bits.osrcrt;
1149 case IPV6_RTHDRDSTOPTS:
1153 struct ipv6_txoptions *opt;
1156 opt = rcu_dereference_protected(np->opt,
1157 lockdep_sock_is_held(sk));
1158 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1160 /* check if ipv6_getsockopt_sticky() returns err code */
1163 return put_user(len, optlen);
1166 case IPV6_RECVHOPOPTS:
1167 val = np->rxopt.bits.hopopts;
1170 case IPV6_2292HOPOPTS:
1171 val = np->rxopt.bits.ohopopts;
1174 case IPV6_RECVDSTOPTS:
1175 val = np->rxopt.bits.dstopts;
1178 case IPV6_2292DSTOPTS:
1179 val = np->rxopt.bits.odstopts;
1186 case IPV6_RECVTCLASS:
1187 val = np->rxopt.bits.rxtclass;
1191 val = np->rxopt.bits.rxflow;
1194 case IPV6_RECVPATHMTU:
1195 val = np->rxopt.bits.rxpmtu;
1200 struct dst_entry *dst;
1201 struct ip6_mtuinfo mtuinfo;
1203 if (len < sizeof(mtuinfo))
1206 len = sizeof(mtuinfo);
1207 memset(&mtuinfo, 0, sizeof(mtuinfo));
1210 dst = __sk_dst_get(sk);
1212 mtuinfo.ip6m_mtu = dst_mtu(dst);
1214 if (!mtuinfo.ip6m_mtu)
1217 if (put_user(len, optlen))
1219 if (copy_to_user(optval, &mtuinfo, len))
1225 case IPV6_TRANSPARENT:
1226 val = inet_sk(sk)->transparent;
1229 case IPV6_RECVORIGDSTADDR:
1230 val = np->rxopt.bits.rxorigdstaddr;
1233 case IPV6_UNICAST_HOPS:
1234 case IPV6_MULTICAST_HOPS:
1236 struct dst_entry *dst;
1238 if (optname == IPV6_UNICAST_HOPS)
1239 val = np->hop_limit;
1241 val = np->mcast_hops;
1245 dst = __sk_dst_get(sk);
1247 val = ip6_dst_hoplimit(dst);
1252 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1256 case IPV6_MULTICAST_LOOP:
1260 case IPV6_MULTICAST_IF:
1261 val = np->mcast_oif;
1264 case IPV6_UNICAST_IF:
1265 val = (__force int)htonl((__u32) np->ucast_oif);
1268 case IPV6_MTU_DISCOVER:
1276 case IPV6_FLOWINFO_SEND:
1280 case IPV6_FLOWLABEL_MGR:
1282 struct in6_flowlabel_req freq;
1285 if (len < sizeof(freq))
1288 if (copy_from_user(&freq, optval, sizeof(freq)))
1291 if (freq.flr_action != IPV6_FL_A_GET)
1295 flags = freq.flr_flags;
1297 memset(&freq, 0, sizeof(freq));
1299 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1303 if (put_user(len, optlen))
1305 if (copy_to_user(optval, &freq, len))
1311 case IPV6_ADDR_PREFERENCES:
1314 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1315 val |= IPV6_PREFER_SRC_TMP;
1316 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1317 val |= IPV6_PREFER_SRC_PUBLIC;
1319 /* XXX: should we return system default? */
1320 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1323 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1324 val |= IPV6_PREFER_SRC_COA;
1326 val |= IPV6_PREFER_SRC_HOME;
1329 case IPV6_MINHOPCOUNT:
1330 val = np->min_hopcount;
1337 case IPV6_AUTOFLOWLABEL:
1338 val = ip6_autoflowlabel(sock_net(sk), np);
1341 case IPV6_RECVFRAGSIZE:
1342 val = np->rxopt.bits.recvfragsize;
1346 return -ENOPROTOOPT;
1348 len = min_t(unsigned int, sizeof(int), len);
1349 if (put_user(len, optlen))
1351 if (copy_to_user(optval, &val, len))
1356 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1357 char __user *optval, int __user *optlen)
1361 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1362 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1364 if (level != SOL_IPV6)
1365 return -ENOPROTOOPT;
1367 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1368 #ifdef CONFIG_NETFILTER
1369 /* we need to exclude all possible ENOPROTOOPTs except default case */
1370 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1373 if (get_user(len, optlen))
1376 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1378 err = put_user(len, optlen);
1383 EXPORT_SYMBOL(ipv6_getsockopt);
1385 #ifdef CONFIG_COMPAT
1386 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1387 char __user *optval, int __user *optlen)
1391 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1392 if (udp_prot.compat_getsockopt != NULL)
1393 return udp_prot.compat_getsockopt(sk, level, optname,
1395 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1398 if (level != SOL_IPV6)
1399 return -ENOPROTOOPT;
1401 if (optname == MCAST_MSFILTER)
1402 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1405 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1407 #ifdef CONFIG_NETFILTER
1408 /* we need to exclude all possible ENOPROTOOPTs except default case */
1409 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1412 if (get_user(len, optlen))
1415 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1417 err = put_user(len, optlen);
1422 EXPORT_SYMBOL(compat_ipv6_getsockopt);