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);
169 /* Another thread has converted the socket into IPv4 with
170 * IPV6_ADDRFORM concurrently.
172 if (unlikely(sk->sk_family != AF_INET6))
178 if (optlen < sizeof(int))
180 if (val == PF_INET) {
181 struct ipv6_txoptions *opt;
182 struct sk_buff *pktopt;
184 if (sk->sk_type == SOCK_RAW)
187 if (sk->sk_protocol == IPPROTO_UDP ||
188 sk->sk_protocol == IPPROTO_UDPLITE) {
189 struct udp_sock *up = udp_sk(sk);
190 if (up->pending == AF_INET6) {
194 } else if (sk->sk_protocol == IPPROTO_TCP) {
195 if (sk->sk_prot != &tcpv6_prot) {
203 if (sk->sk_state != TCP_ESTABLISHED) {
208 if (ipv6_only_sock(sk) ||
209 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
210 retv = -EADDRNOTAVAIL;
214 fl6_free_socklist(sk);
215 __ipv6_sock_mc_close(sk);
216 __ipv6_sock_ac_close(sk);
219 * Sock is moving from IPv6 to IPv4 (sk_prot), so
220 * remove it from the refcnt debug socks count in the
223 sk_refcnt_debug_dec(sk);
225 if (sk->sk_protocol == IPPROTO_TCP) {
226 struct inet_connection_sock *icsk = inet_csk(sk);
228 sock_prot_inuse_add(net, sk->sk_prot, -1);
229 sock_prot_inuse_add(net, &tcp_prot, 1);
231 sk->sk_prot = &tcp_prot;
232 icsk->icsk_af_ops = &ipv4_specific;
233 sk->sk_socket->ops = &inet_stream_ops;
234 sk->sk_family = PF_INET;
235 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
237 struct proto *prot = &udp_prot;
239 if (sk->sk_protocol == IPPROTO_UDPLITE)
240 prot = &udplite_prot;
242 sock_prot_inuse_add(net, sk->sk_prot, -1);
243 sock_prot_inuse_add(net, prot, 1);
246 sk->sk_socket->ops = &inet_dgram_ops;
247 sk->sk_family = PF_INET;
249 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
252 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
255 pktopt = xchg(&np->pktoptions, NULL);
259 * ... and add it to the refcnt debug socks count
260 * in the new family. -acme
262 sk_refcnt_debug_inc(sk);
263 module_put(THIS_MODULE);
270 if (optlen < sizeof(int) ||
271 inet_sk(sk)->inet_num)
273 sk->sk_ipv6only = valbool;
277 case IPV6_RECVPKTINFO:
278 if (optlen < sizeof(int))
280 np->rxopt.bits.rxinfo = valbool;
284 case IPV6_2292PKTINFO:
285 if (optlen < sizeof(int))
287 np->rxopt.bits.rxoinfo = valbool;
291 case IPV6_RECVHOPLIMIT:
292 if (optlen < sizeof(int))
294 np->rxopt.bits.rxhlim = valbool;
298 case IPV6_2292HOPLIMIT:
299 if (optlen < sizeof(int))
301 np->rxopt.bits.rxohlim = valbool;
306 if (optlen < sizeof(int))
308 np->rxopt.bits.srcrt = valbool;
313 if (optlen < sizeof(int))
315 np->rxopt.bits.osrcrt = valbool;
319 case IPV6_RECVHOPOPTS:
320 if (optlen < sizeof(int))
322 np->rxopt.bits.hopopts = valbool;
326 case IPV6_2292HOPOPTS:
327 if (optlen < sizeof(int))
329 np->rxopt.bits.ohopopts = valbool;
333 case IPV6_RECVDSTOPTS:
334 if (optlen < sizeof(int))
336 np->rxopt.bits.dstopts = valbool;
340 case IPV6_2292DSTOPTS:
341 if (optlen < sizeof(int))
343 np->rxopt.bits.odstopts = valbool;
348 if (optlen < sizeof(int))
350 if (val < -1 || val > 0xff)
352 /* RFC 3542, 6.5: default traffic class of 0x0 */
359 case IPV6_RECVTCLASS:
360 if (optlen < sizeof(int))
362 np->rxopt.bits.rxtclass = valbool;
367 if (optlen < sizeof(int))
369 np->rxopt.bits.rxflow = valbool;
373 case IPV6_RECVPATHMTU:
374 if (optlen < sizeof(int))
376 np->rxopt.bits.rxpmtu = valbool;
380 case IPV6_TRANSPARENT:
381 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
382 !ns_capable(net->user_ns, CAP_NET_RAW)) {
386 if (optlen < sizeof(int))
388 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
389 inet_sk(sk)->transparent = 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->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
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 sockcm_cookie sockc_junk;
509 struct ipcm6_cookie ipc6;
511 memset(&fl6, 0, sizeof(fl6));
512 fl6.flowi6_oif = sk->sk_bound_dev_if;
513 fl6.flowi6_mark = sk->sk_mark;
518 /* 1K is probably excessive
519 * 1K is surely not enough, 2K per standard header is 16K.
522 if (optlen > 64*1024)
525 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
530 memset(opt, 0, sizeof(*opt));
531 refcount_set(&opt->refcnt, 1);
532 opt->tot_len = sizeof(*opt) + optlen;
534 if (copy_from_user(opt+1, optval, optlen))
537 msg.msg_controllen = optlen;
538 msg.msg_control = (void *)(opt+1);
541 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
546 opt = ipv6_update_options(sk, opt);
549 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
554 case IPV6_UNICAST_HOPS:
555 if (optlen < sizeof(int))
557 if (val > 255 || val < -1)
563 case IPV6_MULTICAST_HOPS:
564 if (sk->sk_type == SOCK_STREAM)
566 if (optlen < sizeof(int))
568 if (val > 255 || val < -1)
570 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
574 case IPV6_MULTICAST_LOOP:
575 if (optlen < sizeof(int))
579 np->mc_loop = valbool;
583 case IPV6_UNICAST_IF:
585 struct net_device *dev = NULL;
588 if (optlen != sizeof(int))
591 ifindex = (__force int)ntohl((__force __be32)val);
598 dev = dev_get_by_index(net, ifindex);
599 retv = -EADDRNOTAVAIL;
605 if (sk->sk_bound_dev_if)
608 np->ucast_oif = ifindex;
613 case IPV6_MULTICAST_IF:
614 if (sk->sk_type == SOCK_STREAM)
616 if (optlen < sizeof(int))
620 struct net_device *dev;
625 dev = dev_get_by_index_rcu(net, val);
631 midx = l3mdev_master_ifindex_rcu(dev);
635 if (sk->sk_bound_dev_if &&
636 sk->sk_bound_dev_if != val &&
637 (!midx || midx != sk->sk_bound_dev_if))
643 case IPV6_ADD_MEMBERSHIP:
644 case IPV6_DROP_MEMBERSHIP:
646 struct ipv6_mreq mreq;
648 if (optlen < sizeof(struct ipv6_mreq))
652 if (inet_sk(sk)->is_icsk)
656 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
659 if (optname == IPV6_ADD_MEMBERSHIP)
660 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
662 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
665 case IPV6_JOIN_ANYCAST:
666 case IPV6_LEAVE_ANYCAST:
668 struct ipv6_mreq mreq;
670 if (optlen < sizeof(struct ipv6_mreq))
674 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
677 if (optname == IPV6_JOIN_ANYCAST)
678 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
680 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
683 case MCAST_JOIN_GROUP:
684 case MCAST_LEAVE_GROUP:
686 struct group_req greq;
687 struct sockaddr_in6 *psin6;
689 if (optlen < sizeof(struct group_req))
693 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
695 if (greq.gr_group.ss_family != AF_INET6) {
696 retv = -EADDRNOTAVAIL;
699 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
700 if (optname == MCAST_JOIN_GROUP)
701 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
704 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
708 case MCAST_JOIN_SOURCE_GROUP:
709 case MCAST_LEAVE_SOURCE_GROUP:
710 case MCAST_BLOCK_SOURCE:
711 case MCAST_UNBLOCK_SOURCE:
713 struct group_source_req greqs;
716 if (optlen < sizeof(struct group_source_req))
718 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
722 if (greqs.gsr_group.ss_family != AF_INET6 ||
723 greqs.gsr_source.ss_family != AF_INET6) {
724 retv = -EADDRNOTAVAIL;
727 if (optname == MCAST_BLOCK_SOURCE) {
728 omode = MCAST_EXCLUDE;
730 } else if (optname == MCAST_UNBLOCK_SOURCE) {
731 omode = MCAST_EXCLUDE;
733 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
734 struct sockaddr_in6 *psin6;
736 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
737 retv = ipv6_sock_mc_join(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_MTU_DISCOVER:
789 if (optlen < sizeof(int))
791 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
797 if (optlen < sizeof(int))
799 if (val && val < IPV6_MIN_MTU)
805 if (optlen < sizeof(int))
807 np->recverr = valbool;
809 skb_queue_purge(&sk->sk_error_queue);
812 case IPV6_FLOWINFO_SEND:
813 if (optlen < sizeof(int))
815 np->sndflow = valbool;
818 case IPV6_FLOWLABEL_MGR:
819 retv = ipv6_flowlabel_opt(sk, optval, optlen);
821 case IPV6_IPSEC_POLICY:
822 case IPV6_XFRM_POLICY:
824 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
826 retv = xfrm_user_policy(sk, optname, optval, optlen);
829 case IPV6_ADDR_PREFERENCES:
831 unsigned int pref = 0;
832 unsigned int prefmask = ~0;
834 if (optlen < sizeof(int))
839 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
840 switch (val & (IPV6_PREFER_SRC_PUBLIC|
842 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
843 case IPV6_PREFER_SRC_PUBLIC:
844 pref |= IPV6_PREFER_SRC_PUBLIC;
846 case IPV6_PREFER_SRC_TMP:
847 pref |= IPV6_PREFER_SRC_TMP;
849 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
852 goto pref_skip_pubtmp;
857 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
858 IPV6_PREFER_SRC_TMP);
861 /* check HOME/COA conflicts */
862 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
863 case IPV6_PREFER_SRC_HOME:
865 case IPV6_PREFER_SRC_COA:
866 pref |= IPV6_PREFER_SRC_COA;
873 prefmask &= ~IPV6_PREFER_SRC_COA;
876 /* check CGA/NONCGA conflicts */
877 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
878 case IPV6_PREFER_SRC_CGA:
879 case IPV6_PREFER_SRC_NONCGA:
886 np->srcprefs = (np->srcprefs & prefmask) | pref;
891 case IPV6_MINHOPCOUNT:
892 if (optlen < sizeof(int))
894 if (val < 0 || val > 255)
896 np->min_hopcount = val;
900 np->dontfrag = valbool;
903 case IPV6_AUTOFLOWLABEL:
904 np->autoflowlabel = valbool;
905 np->autoflowlabel_set = 1;
908 case IPV6_RECVFRAGSIZE:
909 np->rxopt.bits.recvfragsize = valbool;
928 int ipv6_setsockopt(struct sock *sk, int level, int optname,
929 char __user *optval, unsigned int optlen)
933 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
934 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
936 if (level != SOL_IPV6)
939 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
940 #ifdef CONFIG_NETFILTER
941 /* we need to exclude all possible ENOPROTOOPTs except default case */
942 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
943 optname != IPV6_XFRM_POLICY)
944 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
948 EXPORT_SYMBOL(ipv6_setsockopt);
951 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
952 char __user *optval, unsigned int optlen)
956 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
957 if (udp_prot.compat_setsockopt != NULL)
958 return udp_prot.compat_setsockopt(sk, level, optname,
960 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
963 if (level != SOL_IPV6)
966 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
967 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
970 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
971 #ifdef CONFIG_NETFILTER
972 /* we need to exclude all possible ENOPROTOOPTs except default case */
973 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
974 optname != IPV6_XFRM_POLICY)
975 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
980 EXPORT_SYMBOL(compat_ipv6_setsockopt);
983 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
984 int optname, char __user *optval, int len)
986 struct ipv6_opt_hdr *hdr;
995 case IPV6_RTHDRDSTOPTS:
999 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1005 return -EINVAL; /* should not happen */
1011 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1012 if (copy_to_user(optval, hdr, len))
1017 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1018 char __user *optval, int __user *optlen, unsigned int flags)
1020 struct ipv6_pinfo *np = inet6_sk(sk);
1024 if (ip6_mroute_opt(optname))
1025 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1027 if (get_user(len, optlen))
1031 if (sk->sk_protocol != IPPROTO_UDP &&
1032 sk->sk_protocol != IPPROTO_UDPLITE &&
1033 sk->sk_protocol != IPPROTO_TCP)
1034 return -ENOPROTOOPT;
1035 if (sk->sk_state != TCP_ESTABLISHED)
1037 val = sk->sk_family;
1039 case MCAST_MSFILTER:
1041 struct group_filter gsf;
1044 if (len < GROUP_FILTER_SIZE(0))
1046 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1048 if (gsf.gf_group.ss_family != AF_INET6)
1049 return -EADDRNOTAVAIL;
1051 err = ip6_mc_msfget(sk, &gsf,
1052 (struct group_filter __user *)optval, optlen);
1057 case IPV6_2292PKTOPTIONS:
1060 struct sk_buff *skb;
1062 if (sk->sk_type != SOCK_STREAM)
1063 return -ENOPROTOOPT;
1065 msg.msg_control = optval;
1066 msg.msg_controllen = len;
1067 msg.msg_flags = flags;
1070 skb = np->pktoptions;
1072 ip6_datagram_recv_ctl(sk, &msg, skb);
1075 if (np->rxopt.bits.rxinfo) {
1076 struct in6_pktinfo src_info;
1077 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1078 np->sticky_pktinfo.ipi6_ifindex;
1079 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1080 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1082 if (np->rxopt.bits.rxhlim) {
1083 int hlim = np->mcast_hops;
1084 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1086 if (np->rxopt.bits.rxtclass) {
1087 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1089 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1091 if (np->rxopt.bits.rxoinfo) {
1092 struct in6_pktinfo src_info;
1093 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1094 np->sticky_pktinfo.ipi6_ifindex;
1095 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1096 np->sticky_pktinfo.ipi6_addr;
1097 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1099 if (np->rxopt.bits.rxohlim) {
1100 int hlim = np->mcast_hops;
1101 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1103 if (np->rxopt.bits.rxflow) {
1104 __be32 flowinfo = np->rcv_flowinfo;
1106 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1109 len -= msg.msg_controllen;
1110 return put_user(len, optlen);
1114 struct dst_entry *dst;
1118 dst = __sk_dst_get(sk);
1128 val = sk->sk_ipv6only;
1131 case IPV6_RECVPKTINFO:
1132 val = np->rxopt.bits.rxinfo;
1135 case IPV6_2292PKTINFO:
1136 val = np->rxopt.bits.rxoinfo;
1139 case IPV6_RECVHOPLIMIT:
1140 val = np->rxopt.bits.rxhlim;
1143 case IPV6_2292HOPLIMIT:
1144 val = np->rxopt.bits.rxohlim;
1147 case IPV6_RECVRTHDR:
1148 val = np->rxopt.bits.srcrt;
1151 case IPV6_2292RTHDR:
1152 val = np->rxopt.bits.osrcrt;
1156 case IPV6_RTHDRDSTOPTS:
1160 struct ipv6_txoptions *opt;
1163 opt = rcu_dereference_protected(np->opt,
1164 lockdep_sock_is_held(sk));
1165 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1167 /* check if ipv6_getsockopt_sticky() returns err code */
1170 return put_user(len, optlen);
1173 case IPV6_RECVHOPOPTS:
1174 val = np->rxopt.bits.hopopts;
1177 case IPV6_2292HOPOPTS:
1178 val = np->rxopt.bits.ohopopts;
1181 case IPV6_RECVDSTOPTS:
1182 val = np->rxopt.bits.dstopts;
1185 case IPV6_2292DSTOPTS:
1186 val = np->rxopt.bits.odstopts;
1193 case IPV6_RECVTCLASS:
1194 val = np->rxopt.bits.rxtclass;
1198 val = np->rxopt.bits.rxflow;
1201 case IPV6_RECVPATHMTU:
1202 val = np->rxopt.bits.rxpmtu;
1207 struct dst_entry *dst;
1208 struct ip6_mtuinfo mtuinfo;
1210 if (len < sizeof(mtuinfo))
1213 len = sizeof(mtuinfo);
1214 memset(&mtuinfo, 0, sizeof(mtuinfo));
1217 dst = __sk_dst_get(sk);
1219 mtuinfo.ip6m_mtu = dst_mtu(dst);
1221 if (!mtuinfo.ip6m_mtu)
1224 if (put_user(len, optlen))
1226 if (copy_to_user(optval, &mtuinfo, len))
1232 case IPV6_TRANSPARENT:
1233 val = inet_sk(sk)->transparent;
1236 case IPV6_RECVORIGDSTADDR:
1237 val = np->rxopt.bits.rxorigdstaddr;
1240 case IPV6_UNICAST_HOPS:
1241 case IPV6_MULTICAST_HOPS:
1243 struct dst_entry *dst;
1245 if (optname == IPV6_UNICAST_HOPS)
1246 val = np->hop_limit;
1248 val = np->mcast_hops;
1252 dst = __sk_dst_get(sk);
1254 val = ip6_dst_hoplimit(dst);
1259 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1263 case IPV6_MULTICAST_LOOP:
1267 case IPV6_MULTICAST_IF:
1268 val = np->mcast_oif;
1271 case IPV6_UNICAST_IF:
1272 val = (__force int)htonl((__u32) np->ucast_oif);
1275 case IPV6_MTU_DISCOVER:
1283 case IPV6_FLOWINFO_SEND:
1287 case IPV6_FLOWLABEL_MGR:
1289 struct in6_flowlabel_req freq;
1292 if (len < sizeof(freq))
1295 if (copy_from_user(&freq, optval, sizeof(freq)))
1298 if (freq.flr_action != IPV6_FL_A_GET)
1302 flags = freq.flr_flags;
1304 memset(&freq, 0, sizeof(freq));
1306 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1310 if (put_user(len, optlen))
1312 if (copy_to_user(optval, &freq, len))
1318 case IPV6_ADDR_PREFERENCES:
1321 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1322 val |= IPV6_PREFER_SRC_TMP;
1323 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1324 val |= IPV6_PREFER_SRC_PUBLIC;
1326 /* XXX: should we return system default? */
1327 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1330 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1331 val |= IPV6_PREFER_SRC_COA;
1333 val |= IPV6_PREFER_SRC_HOME;
1336 case IPV6_MINHOPCOUNT:
1337 val = np->min_hopcount;
1344 case IPV6_AUTOFLOWLABEL:
1345 val = ip6_autoflowlabel(sock_net(sk), np);
1348 case IPV6_RECVFRAGSIZE:
1349 val = np->rxopt.bits.recvfragsize;
1353 return -ENOPROTOOPT;
1355 len = min_t(unsigned int, sizeof(int), len);
1356 if (put_user(len, optlen))
1358 if (copy_to_user(optval, &val, len))
1363 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1364 char __user *optval, int __user *optlen)
1368 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1369 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1371 if (level != SOL_IPV6)
1372 return -ENOPROTOOPT;
1374 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1375 #ifdef CONFIG_NETFILTER
1376 /* we need to exclude all possible ENOPROTOOPTs except default case */
1377 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1380 if (get_user(len, optlen))
1383 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1385 err = put_user(len, optlen);
1390 EXPORT_SYMBOL(ipv6_getsockopt);
1392 #ifdef CONFIG_COMPAT
1393 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1394 char __user *optval, int __user *optlen)
1398 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1399 if (udp_prot.compat_getsockopt != NULL)
1400 return udp_prot.compat_getsockopt(sk, level, optname,
1402 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1405 if (level != SOL_IPV6)
1406 return -ENOPROTOOPT;
1408 if (optname == MCAST_MSFILTER)
1409 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1412 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1414 #ifdef CONFIG_NETFILTER
1415 /* we need to exclude all possible ENOPROTOOPTs except default case */
1416 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1419 if (get_user(len, optlen))
1422 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1424 err = put_user(len, optlen);
1429 EXPORT_SYMBOL(compat_ipv6_getsockopt);