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>
56 #include <asm/uaccess.h>
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
61 int ip6_ra_control(struct sock *sk, int sel)
63 struct ip6_ra_chain *ra, *new_ra, **rap;
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
69 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
75 write_unlock_bh(&ip6_ra_lock);
81 write_unlock_bh(&ip6_ra_lock);
89 write_unlock_bh(&ip6_ra_lock);
97 write_unlock_bh(&ip6_ra_lock);
101 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
102 struct ipv6_txoptions *opt)
104 if (inet_sk(sk)->is_icsk) {
106 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
107 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
108 struct inet_connection_sock *icsk = inet_csk(sk);
109 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
110 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
113 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
120 static bool setsockopt_needs_rtnl(int optname)
124 case IPV6_ADD_MEMBERSHIP:
125 case IPV6_DROP_MEMBERSHIP:
126 case IPV6_JOIN_ANYCAST:
127 case IPV6_LEAVE_ANYCAST:
128 case MCAST_JOIN_GROUP:
129 case MCAST_LEAVE_GROUP:
130 case MCAST_JOIN_SOURCE_GROUP:
131 case MCAST_LEAVE_SOURCE_GROUP:
132 case MCAST_BLOCK_SOURCE:
133 case MCAST_UNBLOCK_SOURCE:
140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
141 char __user *optval, unsigned int optlen)
143 struct ipv6_pinfo *np = inet6_sk(sk);
144 struct net *net = sock_net(sk);
146 int retv = -ENOPROTOOPT;
147 bool needs_rtnl = setsockopt_needs_rtnl(optname);
152 if (optlen >= sizeof(int)) {
153 if (get_user(val, (int __user *) optval))
159 valbool = (val != 0);
161 if (ip6_mroute_opt(optname))
162 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
171 if (optlen < sizeof(int))
173 if (val == PF_INET) {
174 struct ipv6_txoptions *opt;
175 struct sk_buff *pktopt;
177 if (sk->sk_type == SOCK_RAW)
180 if (sk->sk_protocol == IPPROTO_UDP ||
181 sk->sk_protocol == IPPROTO_UDPLITE) {
182 struct udp_sock *up = udp_sk(sk);
183 if (up->pending == AF_INET6) {
187 } else if (sk->sk_protocol == IPPROTO_TCP) {
188 if (sk->sk_prot != &tcpv6_prot) {
196 if (sk->sk_state != TCP_ESTABLISHED) {
201 if (ipv6_only_sock(sk) ||
202 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
203 retv = -EADDRNOTAVAIL;
207 fl6_free_socklist(sk);
208 __ipv6_sock_mc_close(sk);
209 __ipv6_sock_ac_close(sk);
212 * Sock is moving from IPv6 to IPv4 (sk_prot), so
213 * remove it from the refcnt debug socks count in the
216 sk_refcnt_debug_dec(sk);
218 if (sk->sk_protocol == IPPROTO_TCP) {
219 struct inet_connection_sock *icsk = inet_csk(sk);
221 sock_prot_inuse_add(net, sk->sk_prot, -1);
222 sock_prot_inuse_add(net, &tcp_prot, 1);
224 sk->sk_prot = &tcp_prot;
225 icsk->icsk_af_ops = &ipv4_specific;
226 sk->sk_socket->ops = &inet_stream_ops;
227 sk->sk_family = PF_INET;
228 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
230 struct proto *prot = &udp_prot;
232 if (sk->sk_protocol == IPPROTO_UDPLITE)
233 prot = &udplite_prot;
235 sock_prot_inuse_add(net, sk->sk_prot, -1);
236 sock_prot_inuse_add(net, prot, 1);
239 sk->sk_socket->ops = &inet_dgram_ops;
240 sk->sk_family = PF_INET;
242 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
245 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
248 pktopt = xchg(&np->pktoptions, NULL);
251 sk->sk_destruct = inet_sock_destruct;
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)
457 opt = ipv6_update_options(sk, opt);
460 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
468 struct in6_pktinfo pkt;
472 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
475 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
479 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
482 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
483 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
488 case IPV6_2292PKTOPTIONS:
490 struct ipv6_txoptions *opt = NULL;
493 struct sockcm_cookie sockc_junk;
494 struct ipcm6_cookie ipc6;
496 memset(&fl6, 0, sizeof(fl6));
497 fl6.flowi6_oif = sk->sk_bound_dev_if;
498 fl6.flowi6_mark = sk->sk_mark;
503 /* 1K is probably excessive
504 * 1K is surely not enough, 2K per standard header is 16K.
507 if (optlen > 64*1024)
510 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
515 memset(opt, 0, sizeof(*opt));
516 atomic_set(&opt->refcnt, 1);
517 opt->tot_len = sizeof(*opt) + optlen;
519 if (copy_from_user(opt+1, optval, optlen))
522 msg.msg_controllen = optlen;
523 msg.msg_control = (void *)(opt+1);
526 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
531 opt = ipv6_update_options(sk, opt);
534 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
539 case IPV6_UNICAST_HOPS:
540 if (optlen < sizeof(int))
542 if (val > 255 || val < -1)
548 case IPV6_MULTICAST_HOPS:
549 if (sk->sk_type == SOCK_STREAM)
551 if (optlen < sizeof(int))
553 if (val > 255 || val < -1)
555 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
559 case IPV6_MULTICAST_LOOP:
560 if (optlen < sizeof(int))
564 np->mc_loop = valbool;
568 case IPV6_UNICAST_IF:
570 struct net_device *dev = NULL;
573 if (optlen != sizeof(int))
576 ifindex = (__force int)ntohl((__force __be32)val);
583 dev = dev_get_by_index(net, ifindex);
584 retv = -EADDRNOTAVAIL;
590 if (sk->sk_bound_dev_if)
593 np->ucast_oif = ifindex;
598 case IPV6_MULTICAST_IF:
599 if (sk->sk_type == SOCK_STREAM)
601 if (optlen < sizeof(int))
605 struct net_device *dev;
610 dev = dev_get_by_index_rcu(net, val);
616 midx = l3mdev_master_ifindex_rcu(dev);
620 if (sk->sk_bound_dev_if &&
621 sk->sk_bound_dev_if != val &&
622 (!midx || midx != sk->sk_bound_dev_if))
628 case IPV6_ADD_MEMBERSHIP:
629 case IPV6_DROP_MEMBERSHIP:
631 struct ipv6_mreq mreq;
633 if (optlen < sizeof(struct ipv6_mreq))
637 if (inet_sk(sk)->is_icsk)
641 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
644 if (optname == IPV6_ADD_MEMBERSHIP)
645 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
647 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
650 case IPV6_JOIN_ANYCAST:
651 case IPV6_LEAVE_ANYCAST:
653 struct ipv6_mreq mreq;
655 if (optlen < sizeof(struct ipv6_mreq))
659 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
662 if (optname == IPV6_JOIN_ANYCAST)
663 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
665 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
668 case MCAST_JOIN_GROUP:
669 case MCAST_LEAVE_GROUP:
671 struct group_req greq;
672 struct sockaddr_in6 *psin6;
674 if (optlen < sizeof(struct group_req))
678 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
680 if (greq.gr_group.ss_family != AF_INET6) {
681 retv = -EADDRNOTAVAIL;
684 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
685 if (optname == MCAST_JOIN_GROUP)
686 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
689 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
693 case MCAST_JOIN_SOURCE_GROUP:
694 case MCAST_LEAVE_SOURCE_GROUP:
695 case MCAST_BLOCK_SOURCE:
696 case MCAST_UNBLOCK_SOURCE:
698 struct group_source_req greqs;
701 if (optlen < sizeof(struct group_source_req))
703 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
707 if (greqs.gsr_group.ss_family != AF_INET6 ||
708 greqs.gsr_source.ss_family != AF_INET6) {
709 retv = -EADDRNOTAVAIL;
712 if (optname == MCAST_BLOCK_SOURCE) {
713 omode = MCAST_EXCLUDE;
715 } else if (optname == MCAST_UNBLOCK_SOURCE) {
716 omode = MCAST_EXCLUDE;
718 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
719 struct sockaddr_in6 *psin6;
721 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
722 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
724 /* prior join w/ different source is ok */
725 if (retv && retv != -EADDRINUSE)
727 omode = MCAST_INCLUDE;
729 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
730 omode = MCAST_INCLUDE;
733 retv = ip6_mc_source(add, omode, sk, &greqs);
738 struct group_filter *gsf;
740 if (optlen < GROUP_FILTER_SIZE(0))
742 if (optlen > sysctl_optmem_max) {
746 gsf = kmalloc(optlen, GFP_KERNEL);
752 if (copy_from_user(gsf, optval, optlen)) {
756 /* numsrc >= (4G-140)/128 overflow in 32 bits */
757 if (gsf->gf_numsrc >= 0x1ffffffU ||
758 gsf->gf_numsrc > sysctl_mld_max_msf) {
763 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
768 retv = ip6_mc_msfilter(sk, gsf);
773 case IPV6_ROUTER_ALERT:
774 if (optlen < sizeof(int))
776 retv = ip6_ra_control(sk, val);
778 case IPV6_MTU_DISCOVER:
779 if (optlen < sizeof(int))
781 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
787 if (optlen < sizeof(int))
789 if (val && val < IPV6_MIN_MTU)
795 if (optlen < sizeof(int))
797 np->recverr = valbool;
799 skb_queue_purge(&sk->sk_error_queue);
802 case IPV6_FLOWINFO_SEND:
803 if (optlen < sizeof(int))
805 np->sndflow = valbool;
808 case IPV6_FLOWLABEL_MGR:
809 retv = ipv6_flowlabel_opt(sk, optval, optlen);
811 case IPV6_IPSEC_POLICY:
812 case IPV6_XFRM_POLICY:
814 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
816 retv = xfrm_user_policy(sk, optname, optval, optlen);
819 case IPV6_ADDR_PREFERENCES:
821 unsigned int pref = 0;
822 unsigned int prefmask = ~0;
824 if (optlen < sizeof(int))
829 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
830 switch (val & (IPV6_PREFER_SRC_PUBLIC|
832 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
833 case IPV6_PREFER_SRC_PUBLIC:
834 pref |= IPV6_PREFER_SRC_PUBLIC;
836 case IPV6_PREFER_SRC_TMP:
837 pref |= IPV6_PREFER_SRC_TMP;
839 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
842 goto pref_skip_pubtmp;
847 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
848 IPV6_PREFER_SRC_TMP);
851 /* check HOME/COA conflicts */
852 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
853 case IPV6_PREFER_SRC_HOME:
855 case IPV6_PREFER_SRC_COA:
856 pref |= IPV6_PREFER_SRC_COA;
863 prefmask &= ~IPV6_PREFER_SRC_COA;
866 /* check CGA/NONCGA conflicts */
867 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
868 case IPV6_PREFER_SRC_CGA:
869 case IPV6_PREFER_SRC_NONCGA:
876 np->srcprefs = (np->srcprefs & prefmask) | pref;
881 case IPV6_MINHOPCOUNT:
882 if (optlen < sizeof(int))
884 if (val < 0 || val > 255)
886 np->min_hopcount = val;
890 np->dontfrag = valbool;
893 case IPV6_AUTOFLOWLABEL:
894 np->autoflowlabel = valbool;
895 np->autoflowlabel_set = 1;
913 int ipv6_setsockopt(struct sock *sk, int level, int optname,
914 char __user *optval, unsigned int optlen)
918 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
919 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
921 if (level != SOL_IPV6)
924 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
925 #ifdef CONFIG_NETFILTER
926 /* we need to exclude all possible ENOPROTOOPTs except default case */
927 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
928 optname != IPV6_XFRM_POLICY)
929 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
933 EXPORT_SYMBOL(ipv6_setsockopt);
936 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
937 char __user *optval, unsigned int optlen)
941 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
942 if (udp_prot.compat_setsockopt != NULL)
943 return udp_prot.compat_setsockopt(sk, level, optname,
945 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
948 if (level != SOL_IPV6)
951 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
952 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
955 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
956 #ifdef CONFIG_NETFILTER
957 /* we need to exclude all possible ENOPROTOOPTs except default case */
958 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
959 optname != IPV6_XFRM_POLICY)
960 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
965 EXPORT_SYMBOL(compat_ipv6_setsockopt);
968 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
969 int optname, char __user *optval, int len)
971 struct ipv6_opt_hdr *hdr;
980 case IPV6_RTHDRDSTOPTS:
984 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
990 return -EINVAL; /* should not happen */
996 len = min_t(unsigned int, len, ipv6_optlen(hdr));
997 if (copy_to_user(optval, hdr, len))
1002 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1003 char __user *optval, int __user *optlen, unsigned int flags)
1005 struct ipv6_pinfo *np = inet6_sk(sk);
1009 if (ip6_mroute_opt(optname))
1010 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1012 if (get_user(len, optlen))
1016 if (sk->sk_protocol != IPPROTO_UDP &&
1017 sk->sk_protocol != IPPROTO_UDPLITE &&
1018 sk->sk_protocol != IPPROTO_TCP)
1019 return -ENOPROTOOPT;
1020 if (sk->sk_state != TCP_ESTABLISHED)
1022 val = sk->sk_family;
1024 case MCAST_MSFILTER:
1026 struct group_filter gsf;
1029 if (len < GROUP_FILTER_SIZE(0))
1031 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1033 if (gsf.gf_group.ss_family != AF_INET6)
1034 return -EADDRNOTAVAIL;
1036 err = ip6_mc_msfget(sk, &gsf,
1037 (struct group_filter __user *)optval, optlen);
1042 case IPV6_2292PKTOPTIONS:
1045 struct sk_buff *skb;
1047 if (sk->sk_type != SOCK_STREAM)
1048 return -ENOPROTOOPT;
1050 msg.msg_control = optval;
1051 msg.msg_controllen = len;
1052 msg.msg_flags = flags;
1055 skb = np->pktoptions;
1057 ip6_datagram_recv_ctl(sk, &msg, skb);
1060 if (np->rxopt.bits.rxinfo) {
1061 struct in6_pktinfo src_info;
1062 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1063 np->sticky_pktinfo.ipi6_ifindex;
1064 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1065 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1067 if (np->rxopt.bits.rxhlim) {
1068 int hlim = np->mcast_hops;
1069 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1071 if (np->rxopt.bits.rxtclass) {
1072 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1074 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1076 if (np->rxopt.bits.rxoinfo) {
1077 struct in6_pktinfo src_info;
1078 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1079 np->sticky_pktinfo.ipi6_ifindex;
1080 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1081 np->sticky_pktinfo.ipi6_addr;
1082 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1084 if (np->rxopt.bits.rxohlim) {
1085 int hlim = np->mcast_hops;
1086 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1088 if (np->rxopt.bits.rxflow) {
1089 __be32 flowinfo = np->rcv_flowinfo;
1091 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1094 len -= msg.msg_controllen;
1095 return put_user(len, optlen);
1099 struct dst_entry *dst;
1103 dst = __sk_dst_get(sk);
1113 val = sk->sk_ipv6only;
1116 case IPV6_RECVPKTINFO:
1117 val = np->rxopt.bits.rxinfo;
1120 case IPV6_2292PKTINFO:
1121 val = np->rxopt.bits.rxoinfo;
1124 case IPV6_RECVHOPLIMIT:
1125 val = np->rxopt.bits.rxhlim;
1128 case IPV6_2292HOPLIMIT:
1129 val = np->rxopt.bits.rxohlim;
1132 case IPV6_RECVRTHDR:
1133 val = np->rxopt.bits.srcrt;
1136 case IPV6_2292RTHDR:
1137 val = np->rxopt.bits.osrcrt;
1141 case IPV6_RTHDRDSTOPTS:
1145 struct ipv6_txoptions *opt;
1148 opt = rcu_dereference_protected(np->opt,
1149 lockdep_sock_is_held(sk));
1150 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1152 /* check if ipv6_getsockopt_sticky() returns err code */
1155 return put_user(len, optlen);
1158 case IPV6_RECVHOPOPTS:
1159 val = np->rxopt.bits.hopopts;
1162 case IPV6_2292HOPOPTS:
1163 val = np->rxopt.bits.ohopopts;
1166 case IPV6_RECVDSTOPTS:
1167 val = np->rxopt.bits.dstopts;
1170 case IPV6_2292DSTOPTS:
1171 val = np->rxopt.bits.odstopts;
1178 case IPV6_RECVTCLASS:
1179 val = np->rxopt.bits.rxtclass;
1183 val = np->rxopt.bits.rxflow;
1186 case IPV6_RECVPATHMTU:
1187 val = np->rxopt.bits.rxpmtu;
1192 struct dst_entry *dst;
1193 struct ip6_mtuinfo mtuinfo;
1195 if (len < sizeof(mtuinfo))
1198 len = sizeof(mtuinfo);
1199 memset(&mtuinfo, 0, sizeof(mtuinfo));
1202 dst = __sk_dst_get(sk);
1204 mtuinfo.ip6m_mtu = dst_mtu(dst);
1206 if (!mtuinfo.ip6m_mtu)
1209 if (put_user(len, optlen))
1211 if (copy_to_user(optval, &mtuinfo, len))
1217 case IPV6_TRANSPARENT:
1218 val = inet_sk(sk)->transparent;
1221 case IPV6_RECVORIGDSTADDR:
1222 val = np->rxopt.bits.rxorigdstaddr;
1225 case IPV6_UNICAST_HOPS:
1226 case IPV6_MULTICAST_HOPS:
1228 struct dst_entry *dst;
1230 if (optname == IPV6_UNICAST_HOPS)
1231 val = np->hop_limit;
1233 val = np->mcast_hops;
1237 dst = __sk_dst_get(sk);
1239 val = ip6_dst_hoplimit(dst);
1244 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1248 case IPV6_MULTICAST_LOOP:
1252 case IPV6_MULTICAST_IF:
1253 val = np->mcast_oif;
1256 case IPV6_UNICAST_IF:
1257 val = (__force int)htonl((__u32) np->ucast_oif);
1260 case IPV6_MTU_DISCOVER:
1268 case IPV6_FLOWINFO_SEND:
1272 case IPV6_FLOWLABEL_MGR:
1274 struct in6_flowlabel_req freq;
1277 if (len < sizeof(freq))
1280 if (copy_from_user(&freq, optval, sizeof(freq)))
1283 if (freq.flr_action != IPV6_FL_A_GET)
1287 flags = freq.flr_flags;
1289 memset(&freq, 0, sizeof(freq));
1291 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1295 if (put_user(len, optlen))
1297 if (copy_to_user(optval, &freq, len))
1303 case IPV6_ADDR_PREFERENCES:
1306 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1307 val |= IPV6_PREFER_SRC_TMP;
1308 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1309 val |= IPV6_PREFER_SRC_PUBLIC;
1311 /* XXX: should we return system default? */
1312 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1315 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1316 val |= IPV6_PREFER_SRC_COA;
1318 val |= IPV6_PREFER_SRC_HOME;
1321 case IPV6_MINHOPCOUNT:
1322 val = np->min_hopcount;
1329 case IPV6_AUTOFLOWLABEL:
1330 val = ip6_autoflowlabel(sock_net(sk), np);
1334 return -ENOPROTOOPT;
1336 len = min_t(unsigned int, sizeof(int), len);
1337 if (put_user(len, optlen))
1339 if (copy_to_user(optval, &val, len))
1344 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1345 char __user *optval, int __user *optlen)
1349 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1350 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1352 if (level != SOL_IPV6)
1353 return -ENOPROTOOPT;
1355 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1356 #ifdef CONFIG_NETFILTER
1357 /* we need to exclude all possible ENOPROTOOPTs except default case */
1358 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1361 if (get_user(len, optlen))
1364 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1366 err = put_user(len, optlen);
1371 EXPORT_SYMBOL(ipv6_getsockopt);
1373 #ifdef CONFIG_COMPAT
1374 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1375 char __user *optval, int __user *optlen)
1379 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1380 if (udp_prot.compat_getsockopt != NULL)
1381 return udp_prot.compat_getsockopt(sk, level, optname,
1383 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1386 if (level != SOL_IPV6)
1387 return -ENOPROTOOPT;
1389 if (optname == MCAST_MSFILTER)
1390 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1393 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1395 #ifdef CONFIG_NETFILTER
1396 /* we need to exclude all possible ENOPROTOOPTs except default case */
1397 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1400 if (get_user(len, optlen))
1403 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1405 err = put_user(len, optlen);
1410 EXPORT_SYMBOL(compat_ipv6_getsockopt);