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)
189 if (sk->sk_state != TCP_ESTABLISHED) {
194 if (ipv6_only_sock(sk) ||
195 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
196 retv = -EADDRNOTAVAIL;
200 fl6_free_socklist(sk);
201 __ipv6_sock_mc_close(sk);
204 * Sock is moving from IPv6 to IPv4 (sk_prot), so
205 * remove it from the refcnt debug socks count in the
208 sk_refcnt_debug_dec(sk);
210 if (sk->sk_protocol == IPPROTO_TCP) {
211 struct inet_connection_sock *icsk = inet_csk(sk);
213 sock_prot_inuse_add(net, sk->sk_prot, -1);
214 sock_prot_inuse_add(net, &tcp_prot, 1);
216 sk->sk_prot = &tcp_prot;
217 icsk->icsk_af_ops = &ipv4_specific;
218 sk->sk_socket->ops = &inet_stream_ops;
219 sk->sk_family = PF_INET;
220 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
222 struct proto *prot = &udp_prot;
224 if (sk->sk_protocol == IPPROTO_UDPLITE)
225 prot = &udplite_prot;
227 sock_prot_inuse_add(net, sk->sk_prot, -1);
228 sock_prot_inuse_add(net, prot, 1);
231 sk->sk_socket->ops = &inet_dgram_ops;
232 sk->sk_family = PF_INET;
234 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
237 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
240 pktopt = xchg(&np->pktoptions, NULL);
244 * ... and add it to the refcnt debug socks count
245 * in the new family. -acme
247 sk_refcnt_debug_inc(sk);
248 module_put(THIS_MODULE);
255 if (optlen < sizeof(int) ||
256 inet_sk(sk)->inet_num)
258 sk->sk_ipv6only = valbool;
262 case IPV6_RECVPKTINFO:
263 if (optlen < sizeof(int))
265 np->rxopt.bits.rxinfo = valbool;
269 case IPV6_2292PKTINFO:
270 if (optlen < sizeof(int))
272 np->rxopt.bits.rxoinfo = valbool;
276 case IPV6_RECVHOPLIMIT:
277 if (optlen < sizeof(int))
279 np->rxopt.bits.rxhlim = valbool;
283 case IPV6_2292HOPLIMIT:
284 if (optlen < sizeof(int))
286 np->rxopt.bits.rxohlim = valbool;
291 if (optlen < sizeof(int))
293 np->rxopt.bits.srcrt = valbool;
298 if (optlen < sizeof(int))
300 np->rxopt.bits.osrcrt = valbool;
304 case IPV6_RECVHOPOPTS:
305 if (optlen < sizeof(int))
307 np->rxopt.bits.hopopts = valbool;
311 case IPV6_2292HOPOPTS:
312 if (optlen < sizeof(int))
314 np->rxopt.bits.ohopopts = valbool;
318 case IPV6_RECVDSTOPTS:
319 if (optlen < sizeof(int))
321 np->rxopt.bits.dstopts = valbool;
325 case IPV6_2292DSTOPTS:
326 if (optlen < sizeof(int))
328 np->rxopt.bits.odstopts = valbool;
333 if (optlen < sizeof(int))
335 if (val < -1 || val > 0xff)
337 /* RFC 3542, 6.5: default traffic class of 0x0 */
344 case IPV6_RECVTCLASS:
345 if (optlen < sizeof(int))
347 np->rxopt.bits.rxtclass = valbool;
352 if (optlen < sizeof(int))
354 np->rxopt.bits.rxflow = valbool;
358 case IPV6_RECVPATHMTU:
359 if (optlen < sizeof(int))
361 np->rxopt.bits.rxpmtu = valbool;
365 case IPV6_TRANSPARENT:
366 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
367 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
371 if (optlen < sizeof(int))
373 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
374 inet_sk(sk)->transparent = valbool;
379 if (optlen < sizeof(int))
381 /* we also don't have a separate freebind bit for IPV6 */
382 inet_sk(sk)->freebind = valbool;
386 case IPV6_RECVORIGDSTADDR:
387 if (optlen < sizeof(int))
389 np->rxopt.bits.rxorigdstaddr = valbool;
394 case IPV6_RTHDRDSTOPTS:
398 struct ipv6_txoptions *opt;
399 struct ipv6_opt_hdr *new = NULL;
401 /* hop-by-hop / destination options are privileged option */
403 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
406 /* remove any sticky options header with a zero option
407 * length, per RFC3542.
413 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
414 optlen & 0x7 || optlen > 8 * 255)
417 new = memdup_user(optval, optlen);
422 if (unlikely(ipv6_optlen(new) > optlen)) {
428 opt = rcu_dereference_protected(np->opt,
429 lockdep_sock_is_held(sk));
430 opt = ipv6_renew_options(sk, opt, optname, new);
437 /* routing header option needs extra check */
439 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
440 struct ipv6_rt_hdr *rthdr = opt->srcrt;
441 switch (rthdr->type) {
442 #if IS_ENABLED(CONFIG_IPV6_MIP6)
443 case IPV6_SRCRT_TYPE_2:
444 if (rthdr->hdrlen != 2 ||
445 rthdr->segments_left != 1)
450 case IPV6_SRCRT_TYPE_4:
452 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
455 if (!seg6_validate_srh(srh, optlen))
465 opt = ipv6_update_options(sk, opt);
468 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
476 struct in6_pktinfo pkt;
480 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
483 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
487 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
490 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
491 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
496 case IPV6_2292PKTOPTIONS:
498 struct ipv6_txoptions *opt = NULL;
501 struct ipcm6_cookie ipc6;
503 memset(&fl6, 0, sizeof(fl6));
504 fl6.flowi6_oif = sk->sk_bound_dev_if;
505 fl6.flowi6_mark = sk->sk_mark;
510 /* 1K is probably excessive
511 * 1K is surely not enough, 2K per standard header is 16K.
514 if (optlen > 64*1024)
517 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
522 memset(opt, 0, sizeof(*opt));
523 refcount_set(&opt->refcnt, 1);
524 opt->tot_len = sizeof(*opt) + optlen;
526 if (copy_from_user(opt+1, optval, optlen))
529 msg.msg_controllen = optlen;
530 msg.msg_control = (void *)(opt+1);
533 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
538 opt = ipv6_update_options(sk, opt);
541 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
546 case IPV6_UNICAST_HOPS:
547 if (optlen < sizeof(int))
549 if (val > 255 || val < -1)
555 case IPV6_MULTICAST_HOPS:
556 if (sk->sk_type == SOCK_STREAM)
558 if (optlen < sizeof(int))
560 if (val > 255 || val < -1)
562 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
566 case IPV6_MULTICAST_LOOP:
567 if (optlen < sizeof(int))
571 np->mc_loop = valbool;
575 case IPV6_UNICAST_IF:
577 struct net_device *dev = NULL;
580 if (optlen != sizeof(int))
583 ifindex = (__force int)ntohl((__force __be32)val);
590 dev = dev_get_by_index(net, ifindex);
591 retv = -EADDRNOTAVAIL;
597 if (sk->sk_bound_dev_if)
600 np->ucast_oif = ifindex;
605 case IPV6_MULTICAST_IF:
606 if (sk->sk_type == SOCK_STREAM)
608 if (optlen < sizeof(int))
612 struct net_device *dev;
617 dev = dev_get_by_index_rcu(net, val);
623 midx = l3mdev_master_ifindex_rcu(dev);
627 if (sk->sk_bound_dev_if &&
628 sk->sk_bound_dev_if != val &&
629 (!midx || midx != sk->sk_bound_dev_if))
635 case IPV6_ADD_MEMBERSHIP:
636 case IPV6_DROP_MEMBERSHIP:
638 struct ipv6_mreq mreq;
640 if (optlen < sizeof(struct ipv6_mreq))
644 if (inet_sk(sk)->is_icsk)
648 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
651 if (optname == IPV6_ADD_MEMBERSHIP)
652 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
654 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
657 case IPV6_JOIN_ANYCAST:
658 case IPV6_LEAVE_ANYCAST:
660 struct ipv6_mreq mreq;
662 if (optlen < sizeof(struct ipv6_mreq))
666 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
669 if (optname == IPV6_JOIN_ANYCAST)
670 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
672 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
675 case IPV6_MULTICAST_ALL:
676 if (optlen < sizeof(int))
678 np->mc_all = valbool;
682 case MCAST_JOIN_GROUP:
683 case MCAST_LEAVE_GROUP:
685 struct group_req greq;
686 struct sockaddr_in6 *psin6;
688 if (optlen < sizeof(struct group_req))
692 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
694 if (greq.gr_group.ss_family != AF_INET6) {
695 retv = -EADDRNOTAVAIL;
698 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
699 if (optname == MCAST_JOIN_GROUP)
700 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
703 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
707 case MCAST_JOIN_SOURCE_GROUP:
708 case MCAST_LEAVE_SOURCE_GROUP:
709 case MCAST_BLOCK_SOURCE:
710 case MCAST_UNBLOCK_SOURCE:
712 struct group_source_req greqs;
715 if (optlen < sizeof(struct group_source_req))
717 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
721 if (greqs.gsr_group.ss_family != AF_INET6 ||
722 greqs.gsr_source.ss_family != AF_INET6) {
723 retv = -EADDRNOTAVAIL;
726 if (optname == MCAST_BLOCK_SOURCE) {
727 omode = MCAST_EXCLUDE;
729 } else if (optname == MCAST_UNBLOCK_SOURCE) {
730 omode = MCAST_EXCLUDE;
732 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
733 struct sockaddr_in6 *psin6;
735 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
736 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
739 /* prior join w/ different source is ok */
740 if (retv && retv != -EADDRINUSE)
742 omode = MCAST_INCLUDE;
744 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
745 omode = MCAST_INCLUDE;
748 retv = ip6_mc_source(add, omode, sk, &greqs);
753 struct group_filter *gsf;
755 if (optlen < GROUP_FILTER_SIZE(0))
757 if (optlen > sysctl_optmem_max) {
761 gsf = memdup_user(optval, optlen);
766 /* numsrc >= (4G-140)/128 overflow in 32 bits */
767 if (gsf->gf_numsrc >= 0x1ffffffU ||
768 gsf->gf_numsrc > sysctl_mld_max_msf) {
773 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
778 retv = ip6_mc_msfilter(sk, gsf);
783 case IPV6_ROUTER_ALERT:
784 if (optlen < sizeof(int))
786 retv = ip6_ra_control(sk, val);
788 case IPV6_ROUTER_ALERT_ISOLATE:
789 if (optlen < sizeof(int))
791 np->rtalert_isolate = valbool;
794 case IPV6_MTU_DISCOVER:
795 if (optlen < sizeof(int))
797 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
803 if (optlen < sizeof(int))
805 if (val && val < IPV6_MIN_MTU)
811 if (optlen < sizeof(int))
813 np->recverr = valbool;
815 skb_queue_purge(&sk->sk_error_queue);
818 case IPV6_FLOWINFO_SEND:
819 if (optlen < sizeof(int))
821 np->sndflow = valbool;
824 case IPV6_FLOWLABEL_MGR:
825 retv = ipv6_flowlabel_opt(sk, optval, optlen);
827 case IPV6_IPSEC_POLICY:
828 case IPV6_XFRM_POLICY:
830 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
832 retv = xfrm_user_policy(sk, optname, optval, optlen);
835 case IPV6_ADDR_PREFERENCES:
837 unsigned int pref = 0;
838 unsigned int prefmask = ~0;
840 if (optlen < sizeof(int))
845 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
846 switch (val & (IPV6_PREFER_SRC_PUBLIC|
848 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
849 case IPV6_PREFER_SRC_PUBLIC:
850 pref |= IPV6_PREFER_SRC_PUBLIC;
852 case IPV6_PREFER_SRC_TMP:
853 pref |= IPV6_PREFER_SRC_TMP;
855 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
858 goto pref_skip_pubtmp;
863 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
864 IPV6_PREFER_SRC_TMP);
867 /* check HOME/COA conflicts */
868 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
869 case IPV6_PREFER_SRC_HOME:
871 case IPV6_PREFER_SRC_COA:
872 pref |= IPV6_PREFER_SRC_COA;
879 prefmask &= ~IPV6_PREFER_SRC_COA;
882 /* check CGA/NONCGA conflicts */
883 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
884 case IPV6_PREFER_SRC_CGA:
885 case IPV6_PREFER_SRC_NONCGA:
892 np->srcprefs = (np->srcprefs & prefmask) | pref;
897 case IPV6_MINHOPCOUNT:
898 if (optlen < sizeof(int))
900 if (val < 0 || val > 255)
902 np->min_hopcount = val;
906 np->dontfrag = valbool;
909 case IPV6_AUTOFLOWLABEL:
910 np->autoflowlabel = valbool;
911 np->autoflowlabel_set = 1;
914 case IPV6_RECVFRAGSIZE:
915 np->rxopt.bits.recvfragsize = valbool;
933 int ipv6_setsockopt(struct sock *sk, int level, int optname,
934 char __user *optval, unsigned int optlen)
938 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
939 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
941 if (level != SOL_IPV6)
944 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
945 #ifdef CONFIG_NETFILTER
946 /* we need to exclude all possible ENOPROTOOPTs except default case */
947 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
948 optname != IPV6_XFRM_POLICY)
949 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
953 EXPORT_SYMBOL(ipv6_setsockopt);
956 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, unsigned int optlen)
961 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
962 if (udp_prot.compat_setsockopt != NULL)
963 return udp_prot.compat_setsockopt(sk, level, optname,
965 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
968 if (level != SOL_IPV6)
971 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
972 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
975 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
976 #ifdef CONFIG_NETFILTER
977 /* we need to exclude all possible ENOPROTOOPTs except default case */
978 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
979 optname != IPV6_XFRM_POLICY)
980 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
985 EXPORT_SYMBOL(compat_ipv6_setsockopt);
988 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
989 int optname, char __user *optval, int len)
991 struct ipv6_opt_hdr *hdr;
1000 case IPV6_RTHDRDSTOPTS:
1004 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1010 return -EINVAL; /* should not happen */
1016 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1017 if (copy_to_user(optval, hdr, len))
1022 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1023 char __user *optval, int __user *optlen, unsigned int flags)
1025 struct ipv6_pinfo *np = inet6_sk(sk);
1029 if (ip6_mroute_opt(optname))
1030 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1032 if (get_user(len, optlen))
1036 if (sk->sk_protocol != IPPROTO_UDP &&
1037 sk->sk_protocol != IPPROTO_UDPLITE &&
1038 sk->sk_protocol != IPPROTO_TCP)
1039 return -ENOPROTOOPT;
1040 if (sk->sk_state != TCP_ESTABLISHED)
1042 val = sk->sk_family;
1044 case MCAST_MSFILTER:
1046 struct group_filter gsf;
1049 if (len < GROUP_FILTER_SIZE(0))
1051 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1053 if (gsf.gf_group.ss_family != AF_INET6)
1054 return -EADDRNOTAVAIL;
1056 err = ip6_mc_msfget(sk, &gsf,
1057 (struct group_filter __user *)optval, optlen);
1062 case IPV6_2292PKTOPTIONS:
1065 struct sk_buff *skb;
1067 if (sk->sk_type != SOCK_STREAM)
1068 return -ENOPROTOOPT;
1070 msg.msg_control = optval;
1071 msg.msg_controllen = len;
1072 msg.msg_flags = flags;
1075 skb = np->pktoptions;
1077 ip6_datagram_recv_ctl(sk, &msg, skb);
1080 if (np->rxopt.bits.rxinfo) {
1081 struct in6_pktinfo src_info;
1082 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1083 np->sticky_pktinfo.ipi6_ifindex;
1084 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1085 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1087 if (np->rxopt.bits.rxhlim) {
1088 int hlim = np->mcast_hops;
1089 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1091 if (np->rxopt.bits.rxtclass) {
1092 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1094 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1096 if (np->rxopt.bits.rxoinfo) {
1097 struct in6_pktinfo src_info;
1098 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1099 np->sticky_pktinfo.ipi6_ifindex;
1100 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1101 np->sticky_pktinfo.ipi6_addr;
1102 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1104 if (np->rxopt.bits.rxohlim) {
1105 int hlim = np->mcast_hops;
1106 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1108 if (np->rxopt.bits.rxflow) {
1109 __be32 flowinfo = np->rcv_flowinfo;
1111 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1114 len -= msg.msg_controllen;
1115 return put_user(len, optlen);
1119 struct dst_entry *dst;
1123 dst = __sk_dst_get(sk);
1133 val = sk->sk_ipv6only;
1136 case IPV6_RECVPKTINFO:
1137 val = np->rxopt.bits.rxinfo;
1140 case IPV6_2292PKTINFO:
1141 val = np->rxopt.bits.rxoinfo;
1144 case IPV6_RECVHOPLIMIT:
1145 val = np->rxopt.bits.rxhlim;
1148 case IPV6_2292HOPLIMIT:
1149 val = np->rxopt.bits.rxohlim;
1152 case IPV6_RECVRTHDR:
1153 val = np->rxopt.bits.srcrt;
1156 case IPV6_2292RTHDR:
1157 val = np->rxopt.bits.osrcrt;
1161 case IPV6_RTHDRDSTOPTS:
1165 struct ipv6_txoptions *opt;
1168 opt = rcu_dereference_protected(np->opt,
1169 lockdep_sock_is_held(sk));
1170 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1172 /* check if ipv6_getsockopt_sticky() returns err code */
1175 return put_user(len, optlen);
1178 case IPV6_RECVHOPOPTS:
1179 val = np->rxopt.bits.hopopts;
1182 case IPV6_2292HOPOPTS:
1183 val = np->rxopt.bits.ohopopts;
1186 case IPV6_RECVDSTOPTS:
1187 val = np->rxopt.bits.dstopts;
1190 case IPV6_2292DSTOPTS:
1191 val = np->rxopt.bits.odstopts;
1198 case IPV6_RECVTCLASS:
1199 val = np->rxopt.bits.rxtclass;
1203 val = np->rxopt.bits.rxflow;
1206 case IPV6_RECVPATHMTU:
1207 val = np->rxopt.bits.rxpmtu;
1212 struct dst_entry *dst;
1213 struct ip6_mtuinfo mtuinfo;
1215 if (len < sizeof(mtuinfo))
1218 len = sizeof(mtuinfo);
1219 memset(&mtuinfo, 0, sizeof(mtuinfo));
1222 dst = __sk_dst_get(sk);
1224 mtuinfo.ip6m_mtu = dst_mtu(dst);
1226 if (!mtuinfo.ip6m_mtu)
1229 if (put_user(len, optlen))
1231 if (copy_to_user(optval, &mtuinfo, len))
1237 case IPV6_TRANSPARENT:
1238 val = inet_sk(sk)->transparent;
1242 val = inet_sk(sk)->freebind;
1245 case IPV6_RECVORIGDSTADDR:
1246 val = np->rxopt.bits.rxorigdstaddr;
1249 case IPV6_UNICAST_HOPS:
1250 case IPV6_MULTICAST_HOPS:
1252 struct dst_entry *dst;
1254 if (optname == IPV6_UNICAST_HOPS)
1255 val = np->hop_limit;
1257 val = np->mcast_hops;
1261 dst = __sk_dst_get(sk);
1263 val = ip6_dst_hoplimit(dst);
1268 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1272 case IPV6_MULTICAST_LOOP:
1276 case IPV6_MULTICAST_IF:
1277 val = np->mcast_oif;
1280 case IPV6_MULTICAST_ALL:
1284 case IPV6_UNICAST_IF:
1285 val = (__force int)htonl((__u32) np->ucast_oif);
1288 case IPV6_MTU_DISCOVER:
1296 case IPV6_FLOWINFO_SEND:
1300 case IPV6_FLOWLABEL_MGR:
1302 struct in6_flowlabel_req freq;
1305 if (len < sizeof(freq))
1308 if (copy_from_user(&freq, optval, sizeof(freq)))
1311 if (freq.flr_action != IPV6_FL_A_GET)
1315 flags = freq.flr_flags;
1317 memset(&freq, 0, sizeof(freq));
1319 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1323 if (put_user(len, optlen))
1325 if (copy_to_user(optval, &freq, len))
1331 case IPV6_ADDR_PREFERENCES:
1334 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1335 val |= IPV6_PREFER_SRC_TMP;
1336 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1337 val |= IPV6_PREFER_SRC_PUBLIC;
1339 /* XXX: should we return system default? */
1340 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1343 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1344 val |= IPV6_PREFER_SRC_COA;
1346 val |= IPV6_PREFER_SRC_HOME;
1349 case IPV6_MINHOPCOUNT:
1350 val = np->min_hopcount;
1357 case IPV6_AUTOFLOWLABEL:
1358 val = ip6_autoflowlabel(sock_net(sk), np);
1361 case IPV6_RECVFRAGSIZE:
1362 val = np->rxopt.bits.recvfragsize;
1365 case IPV6_ROUTER_ALERT_ISOLATE:
1366 val = np->rtalert_isolate;
1370 return -ENOPROTOOPT;
1372 len = min_t(unsigned int, sizeof(int), len);
1373 if (put_user(len, optlen))
1375 if (copy_to_user(optval, &val, len))
1380 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1381 char __user *optval, int __user *optlen)
1385 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1386 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1388 if (level != SOL_IPV6)
1389 return -ENOPROTOOPT;
1391 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1392 #ifdef CONFIG_NETFILTER
1393 /* we need to exclude all possible ENOPROTOOPTs except default case */
1394 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1397 if (get_user(len, optlen))
1400 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1402 err = put_user(len, optlen);
1407 EXPORT_SYMBOL(ipv6_getsockopt);
1409 #ifdef CONFIG_COMPAT
1410 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1411 char __user *optval, int __user *optlen)
1415 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1416 if (udp_prot.compat_getsockopt != NULL)
1417 return udp_prot.compat_getsockopt(sk, level, optname,
1419 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1422 if (level != SOL_IPV6)
1423 return -ENOPROTOOPT;
1425 if (optname == MCAST_MSFILTER)
1426 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1429 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1431 #ifdef CONFIG_NETFILTER
1432 /* we need to exclude all possible ENOPROTOOPTs except default case */
1433 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1436 if (get_user(len, optlen))
1439 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1441 err = put_user(len, optlen);
1446 EXPORT_SYMBOL(compat_ipv6_getsockopt);