1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
9 * Based on linux/net/ipv4/ip_sockglue.c
11 * FIXME: Make the setsockopt code POSIX compliant: That is
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
48 #include <net/udplite.h>
50 #include <net/compat.h>
53 #include <linux/uaccess.h>
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
58 int ip6_ra_control(struct sock *sk, int sel)
60 struct ip6_ra_chain *ra, *new_ra, **rap;
62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67 if (sel >= 0 && !new_ra)
70 write_lock_bh(&ip6_ra_lock);
71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 write_unlock_bh(&ip6_ra_lock);
80 write_unlock_bh(&ip6_ra_lock);
88 write_unlock_bh(&ip6_ra_lock);
96 write_unlock_bh(&ip6_ra_lock);
100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101 struct ipv6_txoptions *opt)
103 if (inet_sk(sk)->is_icsk) {
105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107 struct inet_connection_sock *icsk = inet_csk(sk);
108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
119 static bool setsockopt_needs_rtnl(int optname)
123 case IPV6_ADD_MEMBERSHIP:
124 case IPV6_DROP_MEMBERSHIP:
125 case IPV6_JOIN_ANYCAST:
126 case IPV6_LEAVE_ANYCAST:
127 case MCAST_JOIN_GROUP:
128 case MCAST_LEAVE_GROUP:
129 case MCAST_JOIN_SOURCE_GROUP:
130 case MCAST_LEAVE_SOURCE_GROUP:
131 case MCAST_BLOCK_SOURCE:
132 case MCAST_UNBLOCK_SOURCE:
139 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
140 char __user *optval, unsigned int optlen)
142 struct ipv6_pinfo *np = inet6_sk(sk);
143 struct net *net = sock_net(sk);
145 int retv = -ENOPROTOOPT;
146 bool needs_rtnl = setsockopt_needs_rtnl(optname);
151 if (optlen >= sizeof(int)) {
152 if (get_user(val, (int __user *) optval))
158 valbool = (val != 0);
160 if (ip6_mroute_opt(optname))
161 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
170 if (optlen < sizeof(int))
172 if (val == PF_INET) {
173 struct ipv6_txoptions *opt;
174 struct sk_buff *pktopt;
176 if (sk->sk_type == SOCK_RAW)
179 if (sk->sk_protocol == IPPROTO_UDP ||
180 sk->sk_protocol == IPPROTO_UDPLITE) {
181 struct udp_sock *up = udp_sk(sk);
182 if (up->pending == AF_INET6) {
186 } else if (sk->sk_protocol == IPPROTO_TCP) {
187 if (sk->sk_prot != &tcpv6_prot) {
195 if (sk->sk_state != TCP_ESTABLISHED) {
200 if (ipv6_only_sock(sk) ||
201 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
202 retv = -EADDRNOTAVAIL;
206 fl6_free_socklist(sk);
207 __ipv6_sock_mc_close(sk);
208 __ipv6_sock_ac_close(sk);
211 * Sock is moving from IPv6 to IPv4 (sk_prot), so
212 * remove it from the refcnt debug socks count in the
215 sk_refcnt_debug_dec(sk);
217 if (sk->sk_protocol == IPPROTO_TCP) {
218 struct inet_connection_sock *icsk = inet_csk(sk);
220 sock_prot_inuse_add(net, sk->sk_prot, -1);
221 sock_prot_inuse_add(net, &tcp_prot, 1);
223 sk->sk_prot = &tcp_prot;
224 icsk->icsk_af_ops = &ipv4_specific;
225 sk->sk_socket->ops = &inet_stream_ops;
226 sk->sk_family = PF_INET;
227 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
229 struct proto *prot = &udp_prot;
231 if (sk->sk_protocol == IPPROTO_UDPLITE)
232 prot = &udplite_prot;
234 sock_prot_inuse_add(net, sk->sk_prot, -1);
235 sock_prot_inuse_add(net, prot, 1);
238 sk->sk_socket->ops = &inet_dgram_ops;
239 sk->sk_family = PF_INET;
241 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
244 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
247 pktopt = xchg(&np->pktoptions, NULL);
251 * ... and add it to the refcnt debug socks count
252 * in the new family. -acme
254 sk_refcnt_debug_inc(sk);
255 module_put(THIS_MODULE);
262 if (optlen < sizeof(int) ||
263 inet_sk(sk)->inet_num)
265 sk->sk_ipv6only = valbool;
269 case IPV6_RECVPKTINFO:
270 if (optlen < sizeof(int))
272 np->rxopt.bits.rxinfo = valbool;
276 case IPV6_2292PKTINFO:
277 if (optlen < sizeof(int))
279 np->rxopt.bits.rxoinfo = valbool;
283 case IPV6_RECVHOPLIMIT:
284 if (optlen < sizeof(int))
286 np->rxopt.bits.rxhlim = valbool;
290 case IPV6_2292HOPLIMIT:
291 if (optlen < sizeof(int))
293 np->rxopt.bits.rxohlim = valbool;
298 if (optlen < sizeof(int))
300 np->rxopt.bits.srcrt = valbool;
305 if (optlen < sizeof(int))
307 np->rxopt.bits.osrcrt = valbool;
311 case IPV6_RECVHOPOPTS:
312 if (optlen < sizeof(int))
314 np->rxopt.bits.hopopts = valbool;
318 case IPV6_2292HOPOPTS:
319 if (optlen < sizeof(int))
321 np->rxopt.bits.ohopopts = valbool;
325 case IPV6_RECVDSTOPTS:
326 if (optlen < sizeof(int))
328 np->rxopt.bits.dstopts = valbool;
332 case IPV6_2292DSTOPTS:
333 if (optlen < sizeof(int))
335 np->rxopt.bits.odstopts = valbool;
340 if (optlen < sizeof(int))
342 if (val < -1 || val > 0xff)
344 /* RFC 3542, 6.5: default traffic class of 0x0 */
351 case IPV6_RECVTCLASS:
352 if (optlen < sizeof(int))
354 np->rxopt.bits.rxtclass = valbool;
359 if (optlen < sizeof(int))
361 np->rxopt.bits.rxflow = valbool;
365 case IPV6_RECVPATHMTU:
366 if (optlen < sizeof(int))
368 np->rxopt.bits.rxpmtu = valbool;
372 case IPV6_TRANSPARENT:
373 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
374 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
378 if (optlen < sizeof(int))
380 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
381 inet_sk(sk)->transparent = valbool;
386 if (optlen < sizeof(int))
388 /* we also don't have a separate freebind bit for IPV6 */
389 inet_sk(sk)->freebind = valbool;
393 case IPV6_RECVORIGDSTADDR:
394 if (optlen < sizeof(int))
396 np->rxopt.bits.rxorigdstaddr = valbool;
401 case IPV6_RTHDRDSTOPTS:
405 struct ipv6_txoptions *opt;
406 struct ipv6_opt_hdr *new = NULL;
408 /* hop-by-hop / destination options are privileged option */
410 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
413 /* remove any sticky options header with a zero option
414 * length, per RFC3542.
420 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
421 optlen & 0x7 || optlen > 8 * 255)
424 new = memdup_user(optval, optlen);
429 if (unlikely(ipv6_optlen(new) > optlen)) {
435 opt = rcu_dereference_protected(np->opt,
436 lockdep_sock_is_held(sk));
437 opt = ipv6_renew_options(sk, opt, optname, new);
444 /* routing header option needs extra check */
446 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
447 struct ipv6_rt_hdr *rthdr = opt->srcrt;
448 switch (rthdr->type) {
449 #if IS_ENABLED(CONFIG_IPV6_MIP6)
450 case IPV6_SRCRT_TYPE_2:
451 if (rthdr->hdrlen != 2 ||
452 rthdr->segments_left != 1)
457 case IPV6_SRCRT_TYPE_4:
459 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
462 if (!seg6_validate_srh(srh, optlen))
472 opt = ipv6_update_options(sk, opt);
475 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
483 struct in6_pktinfo pkt;
487 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
490 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
494 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
497 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
498 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
503 case IPV6_2292PKTOPTIONS:
505 struct ipv6_txoptions *opt = NULL;
508 struct ipcm6_cookie ipc6;
510 memset(&fl6, 0, sizeof(fl6));
511 fl6.flowi6_oif = sk->sk_bound_dev_if;
512 fl6.flowi6_mark = sk->sk_mark;
517 /* 1K is probably excessive
518 * 1K is surely not enough, 2K per standard header is 16K.
521 if (optlen > 64*1024)
524 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
529 memset(opt, 0, sizeof(*opt));
530 refcount_set(&opt->refcnt, 1);
531 opt->tot_len = sizeof(*opt) + optlen;
533 if (copy_from_user(opt+1, optval, optlen))
536 msg.msg_controllen = optlen;
537 msg.msg_control = (void *)(opt+1);
540 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
545 opt = ipv6_update_options(sk, opt);
548 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
553 case IPV6_UNICAST_HOPS:
554 if (optlen < sizeof(int))
556 if (val > 255 || val < -1)
562 case IPV6_MULTICAST_HOPS:
563 if (sk->sk_type == SOCK_STREAM)
565 if (optlen < sizeof(int))
567 if (val > 255 || val < -1)
569 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
573 case IPV6_MULTICAST_LOOP:
574 if (optlen < sizeof(int))
578 np->mc_loop = valbool;
582 case IPV6_UNICAST_IF:
584 struct net_device *dev = NULL;
587 if (optlen != sizeof(int))
590 ifindex = (__force int)ntohl((__force __be32)val);
597 dev = dev_get_by_index(net, ifindex);
598 retv = -EADDRNOTAVAIL;
604 if (sk->sk_bound_dev_if)
607 np->ucast_oif = ifindex;
612 case IPV6_MULTICAST_IF:
613 if (sk->sk_type == SOCK_STREAM)
615 if (optlen < sizeof(int))
619 struct net_device *dev;
624 dev = dev_get_by_index_rcu(net, val);
630 midx = l3mdev_master_ifindex_rcu(dev);
634 if (sk->sk_bound_dev_if &&
635 sk->sk_bound_dev_if != val &&
636 (!midx || midx != sk->sk_bound_dev_if))
642 case IPV6_ADD_MEMBERSHIP:
643 case IPV6_DROP_MEMBERSHIP:
645 struct ipv6_mreq mreq;
647 if (optlen < sizeof(struct ipv6_mreq))
651 if (inet_sk(sk)->is_icsk)
655 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
658 if (optname == IPV6_ADD_MEMBERSHIP)
659 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
661 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
664 case IPV6_JOIN_ANYCAST:
665 case IPV6_LEAVE_ANYCAST:
667 struct ipv6_mreq mreq;
669 if (optlen < sizeof(struct ipv6_mreq))
673 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
676 if (optname == IPV6_JOIN_ANYCAST)
677 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
679 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
682 case IPV6_MULTICAST_ALL:
683 if (optlen < sizeof(int))
685 np->mc_all = valbool;
689 case MCAST_JOIN_GROUP:
690 case MCAST_LEAVE_GROUP:
692 struct group_req greq;
693 struct sockaddr_in6 *psin6;
695 if (optlen < sizeof(struct group_req))
699 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
701 if (greq.gr_group.ss_family != AF_INET6) {
702 retv = -EADDRNOTAVAIL;
705 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
706 if (optname == MCAST_JOIN_GROUP)
707 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
710 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
714 case MCAST_JOIN_SOURCE_GROUP:
715 case MCAST_LEAVE_SOURCE_GROUP:
716 case MCAST_BLOCK_SOURCE:
717 case MCAST_UNBLOCK_SOURCE:
719 struct group_source_req greqs;
722 if (optlen < sizeof(struct group_source_req))
724 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
728 if (greqs.gsr_group.ss_family != AF_INET6 ||
729 greqs.gsr_source.ss_family != AF_INET6) {
730 retv = -EADDRNOTAVAIL;
733 if (optname == MCAST_BLOCK_SOURCE) {
734 omode = MCAST_EXCLUDE;
736 } else if (optname == MCAST_UNBLOCK_SOURCE) {
737 omode = MCAST_EXCLUDE;
739 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
740 struct sockaddr_in6 *psin6;
742 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
743 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
746 /* prior join w/ different source is ok */
747 if (retv && retv != -EADDRINUSE)
749 omode = MCAST_INCLUDE;
751 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
752 omode = MCAST_INCLUDE;
755 retv = ip6_mc_source(add, omode, sk, &greqs);
760 struct group_filter *gsf;
762 if (optlen < GROUP_FILTER_SIZE(0))
764 if (optlen > sysctl_optmem_max) {
768 gsf = memdup_user(optval, optlen);
773 /* numsrc >= (4G-140)/128 overflow in 32 bits */
774 if (gsf->gf_numsrc >= 0x1ffffffU ||
775 gsf->gf_numsrc > sysctl_mld_max_msf) {
780 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
785 retv = ip6_mc_msfilter(sk, gsf);
790 case IPV6_ROUTER_ALERT:
791 if (optlen < sizeof(int))
793 retv = ip6_ra_control(sk, val);
795 case IPV6_ROUTER_ALERT_ISOLATE:
796 if (optlen < sizeof(int))
798 np->rtalert_isolate = valbool;
801 case IPV6_MTU_DISCOVER:
802 if (optlen < sizeof(int))
804 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
810 if (optlen < sizeof(int))
812 if (val && val < IPV6_MIN_MTU)
818 if (optlen < sizeof(int))
820 np->recverr = valbool;
822 skb_queue_purge(&sk->sk_error_queue);
825 case IPV6_FLOWINFO_SEND:
826 if (optlen < sizeof(int))
828 np->sndflow = valbool;
831 case IPV6_FLOWLABEL_MGR:
832 retv = ipv6_flowlabel_opt(sk, optval, optlen);
834 case IPV6_IPSEC_POLICY:
835 case IPV6_XFRM_POLICY:
837 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
839 retv = xfrm_user_policy(sk, optname, optval, optlen);
842 case IPV6_ADDR_PREFERENCES:
844 unsigned int pref = 0;
845 unsigned int prefmask = ~0;
847 if (optlen < sizeof(int))
852 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
853 switch (val & (IPV6_PREFER_SRC_PUBLIC|
855 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
856 case IPV6_PREFER_SRC_PUBLIC:
857 pref |= IPV6_PREFER_SRC_PUBLIC;
859 case IPV6_PREFER_SRC_TMP:
860 pref |= IPV6_PREFER_SRC_TMP;
862 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
865 goto pref_skip_pubtmp;
870 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
871 IPV6_PREFER_SRC_TMP);
874 /* check HOME/COA conflicts */
875 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
876 case IPV6_PREFER_SRC_HOME:
878 case IPV6_PREFER_SRC_COA:
879 pref |= IPV6_PREFER_SRC_COA;
886 prefmask &= ~IPV6_PREFER_SRC_COA;
889 /* check CGA/NONCGA conflicts */
890 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
891 case IPV6_PREFER_SRC_CGA:
892 case IPV6_PREFER_SRC_NONCGA:
899 np->srcprefs = (np->srcprefs & prefmask) | pref;
904 case IPV6_MINHOPCOUNT:
905 if (optlen < sizeof(int))
907 if (val < 0 || val > 255)
909 np->min_hopcount = val;
913 np->dontfrag = valbool;
916 case IPV6_AUTOFLOWLABEL:
917 np->autoflowlabel = valbool;
918 np->autoflowlabel_set = 1;
921 case IPV6_RECVFRAGSIZE:
922 np->rxopt.bits.recvfragsize = valbool;
940 int ipv6_setsockopt(struct sock *sk, int level, int optname,
941 char __user *optval, unsigned int optlen)
945 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
946 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
948 if (level != SOL_IPV6)
951 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
952 #ifdef CONFIG_NETFILTER
953 /* we need to exclude all possible ENOPROTOOPTs except default case */
954 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
955 optname != IPV6_XFRM_POLICY)
956 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
960 EXPORT_SYMBOL(ipv6_setsockopt);
963 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
964 char __user *optval, unsigned int optlen)
968 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
969 if (udp_prot.compat_setsockopt != NULL)
970 return udp_prot.compat_setsockopt(sk, level, optname,
972 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
975 if (level != SOL_IPV6)
978 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
979 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
982 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
983 #ifdef CONFIG_NETFILTER
984 /* we need to exclude all possible ENOPROTOOPTs except default case */
985 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
986 optname != IPV6_XFRM_POLICY)
987 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
992 EXPORT_SYMBOL(compat_ipv6_setsockopt);
995 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
996 int optname, char __user *optval, int len)
998 struct ipv6_opt_hdr *hdr;
1007 case IPV6_RTHDRDSTOPTS:
1011 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1017 return -EINVAL; /* should not happen */
1023 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1024 if (copy_to_user(optval, hdr, len))
1029 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1030 char __user *optval, int __user *optlen, unsigned int flags)
1032 struct ipv6_pinfo *np = inet6_sk(sk);
1036 if (ip6_mroute_opt(optname))
1037 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1039 if (get_user(len, optlen))
1043 if (sk->sk_protocol != IPPROTO_UDP &&
1044 sk->sk_protocol != IPPROTO_UDPLITE &&
1045 sk->sk_protocol != IPPROTO_TCP)
1046 return -ENOPROTOOPT;
1047 if (sk->sk_state != TCP_ESTABLISHED)
1049 val = sk->sk_family;
1051 case MCAST_MSFILTER:
1053 struct group_filter gsf;
1056 if (len < GROUP_FILTER_SIZE(0))
1058 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1060 if (gsf.gf_group.ss_family != AF_INET6)
1061 return -EADDRNOTAVAIL;
1063 err = ip6_mc_msfget(sk, &gsf,
1064 (struct group_filter __user *)optval, optlen);
1069 case IPV6_2292PKTOPTIONS:
1072 struct sk_buff *skb;
1074 if (sk->sk_type != SOCK_STREAM)
1075 return -ENOPROTOOPT;
1077 msg.msg_control = optval;
1078 msg.msg_controllen = len;
1079 msg.msg_flags = flags;
1082 skb = np->pktoptions;
1084 ip6_datagram_recv_ctl(sk, &msg, skb);
1087 if (np->rxopt.bits.rxinfo) {
1088 struct in6_pktinfo src_info;
1089 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1090 np->sticky_pktinfo.ipi6_ifindex;
1091 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1092 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1094 if (np->rxopt.bits.rxhlim) {
1095 int hlim = np->mcast_hops;
1096 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1098 if (np->rxopt.bits.rxtclass) {
1099 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1101 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1103 if (np->rxopt.bits.rxoinfo) {
1104 struct in6_pktinfo src_info;
1105 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1106 np->sticky_pktinfo.ipi6_ifindex;
1107 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1108 np->sticky_pktinfo.ipi6_addr;
1109 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1111 if (np->rxopt.bits.rxohlim) {
1112 int hlim = np->mcast_hops;
1113 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1115 if (np->rxopt.bits.rxflow) {
1116 __be32 flowinfo = np->rcv_flowinfo;
1118 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1121 len -= msg.msg_controllen;
1122 return put_user(len, optlen);
1126 struct dst_entry *dst;
1130 dst = __sk_dst_get(sk);
1140 val = sk->sk_ipv6only;
1143 case IPV6_RECVPKTINFO:
1144 val = np->rxopt.bits.rxinfo;
1147 case IPV6_2292PKTINFO:
1148 val = np->rxopt.bits.rxoinfo;
1151 case IPV6_RECVHOPLIMIT:
1152 val = np->rxopt.bits.rxhlim;
1155 case IPV6_2292HOPLIMIT:
1156 val = np->rxopt.bits.rxohlim;
1159 case IPV6_RECVRTHDR:
1160 val = np->rxopt.bits.srcrt;
1163 case IPV6_2292RTHDR:
1164 val = np->rxopt.bits.osrcrt;
1168 case IPV6_RTHDRDSTOPTS:
1172 struct ipv6_txoptions *opt;
1175 opt = rcu_dereference_protected(np->opt,
1176 lockdep_sock_is_held(sk));
1177 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1179 /* check if ipv6_getsockopt_sticky() returns err code */
1182 return put_user(len, optlen);
1185 case IPV6_RECVHOPOPTS:
1186 val = np->rxopt.bits.hopopts;
1189 case IPV6_2292HOPOPTS:
1190 val = np->rxopt.bits.ohopopts;
1193 case IPV6_RECVDSTOPTS:
1194 val = np->rxopt.bits.dstopts;
1197 case IPV6_2292DSTOPTS:
1198 val = np->rxopt.bits.odstopts;
1205 case IPV6_RECVTCLASS:
1206 val = np->rxopt.bits.rxtclass;
1210 val = np->rxopt.bits.rxflow;
1213 case IPV6_RECVPATHMTU:
1214 val = np->rxopt.bits.rxpmtu;
1219 struct dst_entry *dst;
1220 struct ip6_mtuinfo mtuinfo;
1222 if (len < sizeof(mtuinfo))
1225 len = sizeof(mtuinfo);
1226 memset(&mtuinfo, 0, sizeof(mtuinfo));
1229 dst = __sk_dst_get(sk);
1231 mtuinfo.ip6m_mtu = dst_mtu(dst);
1233 if (!mtuinfo.ip6m_mtu)
1236 if (put_user(len, optlen))
1238 if (copy_to_user(optval, &mtuinfo, len))
1244 case IPV6_TRANSPARENT:
1245 val = inet_sk(sk)->transparent;
1249 val = inet_sk(sk)->freebind;
1252 case IPV6_RECVORIGDSTADDR:
1253 val = np->rxopt.bits.rxorigdstaddr;
1256 case IPV6_UNICAST_HOPS:
1257 case IPV6_MULTICAST_HOPS:
1259 struct dst_entry *dst;
1261 if (optname == IPV6_UNICAST_HOPS)
1262 val = np->hop_limit;
1264 val = np->mcast_hops;
1268 dst = __sk_dst_get(sk);
1270 val = ip6_dst_hoplimit(dst);
1275 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1279 case IPV6_MULTICAST_LOOP:
1283 case IPV6_MULTICAST_IF:
1284 val = np->mcast_oif;
1287 case IPV6_MULTICAST_ALL:
1291 case IPV6_UNICAST_IF:
1292 val = (__force int)htonl((__u32) np->ucast_oif);
1295 case IPV6_MTU_DISCOVER:
1303 case IPV6_FLOWINFO_SEND:
1307 case IPV6_FLOWLABEL_MGR:
1309 struct in6_flowlabel_req freq;
1312 if (len < sizeof(freq))
1315 if (copy_from_user(&freq, optval, sizeof(freq)))
1318 if (freq.flr_action != IPV6_FL_A_GET)
1322 flags = freq.flr_flags;
1324 memset(&freq, 0, sizeof(freq));
1326 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1330 if (put_user(len, optlen))
1332 if (copy_to_user(optval, &freq, len))
1338 case IPV6_ADDR_PREFERENCES:
1341 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1342 val |= IPV6_PREFER_SRC_TMP;
1343 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1344 val |= IPV6_PREFER_SRC_PUBLIC;
1346 /* XXX: should we return system default? */
1347 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1350 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1351 val |= IPV6_PREFER_SRC_COA;
1353 val |= IPV6_PREFER_SRC_HOME;
1356 case IPV6_MINHOPCOUNT:
1357 val = np->min_hopcount;
1364 case IPV6_AUTOFLOWLABEL:
1365 val = ip6_autoflowlabel(sock_net(sk), np);
1368 case IPV6_RECVFRAGSIZE:
1369 val = np->rxopt.bits.recvfragsize;
1372 case IPV6_ROUTER_ALERT_ISOLATE:
1373 val = np->rtalert_isolate;
1377 return -ENOPROTOOPT;
1379 len = min_t(unsigned int, sizeof(int), len);
1380 if (put_user(len, optlen))
1382 if (copy_to_user(optval, &val, len))
1387 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1388 char __user *optval, int __user *optlen)
1392 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1393 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1395 if (level != SOL_IPV6)
1396 return -ENOPROTOOPT;
1398 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1399 #ifdef CONFIG_NETFILTER
1400 /* we need to exclude all possible ENOPROTOOPTs except default case */
1401 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1404 if (get_user(len, optlen))
1407 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1409 err = put_user(len, optlen);
1414 EXPORT_SYMBOL(ipv6_getsockopt);
1416 #ifdef CONFIG_COMPAT
1417 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1418 char __user *optval, int __user *optlen)
1422 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1423 if (udp_prot.compat_getsockopt != NULL)
1424 return udp_prot.compat_getsockopt(sk, level, optname,
1426 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1429 if (level != SOL_IPV6)
1430 return -ENOPROTOOPT;
1432 if (optname == MCAST_MSFILTER)
1433 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1436 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1438 #ifdef CONFIG_NETFILTER
1439 /* we need to exclude all possible ENOPROTOOPTs except default case */
1440 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1443 if (get_user(len, optlen))
1446 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1448 err = put_user(len, optlen);
1453 EXPORT_SYMBOL(compat_ipv6_getsockopt);