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 if (sk->sk_type == SOCK_RAW)
184 if (sk->sk_protocol == IPPROTO_UDP ||
185 sk->sk_protocol == IPPROTO_UDPLITE) {
186 struct udp_sock *up = udp_sk(sk);
187 if (up->pending == AF_INET6) {
191 } else if (sk->sk_protocol == IPPROTO_TCP) {
192 if (sk->sk_prot != &tcpv6_prot) {
200 if (sk->sk_state != TCP_ESTABLISHED) {
205 if (ipv6_only_sock(sk) ||
206 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
207 retv = -EADDRNOTAVAIL;
211 __ipv6_sock_mc_close(sk);
212 __ipv6_sock_ac_close(sk);
215 * Sock is moving from IPv6 to IPv4 (sk_prot), so
216 * remove it from the refcnt debug socks count in the
219 sk_refcnt_debug_dec(sk);
221 if (sk->sk_protocol == IPPROTO_TCP) {
222 struct inet_connection_sock *icsk = inet_csk(sk);
224 sock_prot_inuse_add(net, sk->sk_prot, -1);
225 sock_prot_inuse_add(net, &tcp_prot, 1);
227 sk->sk_prot = &tcp_prot;
228 icsk->icsk_af_ops = &ipv4_specific;
229 sk->sk_socket->ops = &inet_stream_ops;
230 sk->sk_family = PF_INET;
231 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
233 struct proto *prot = &udp_prot;
235 if (sk->sk_protocol == IPPROTO_UDPLITE)
236 prot = &udplite_prot;
238 sock_prot_inuse_add(net, sk->sk_prot, -1);
239 sock_prot_inuse_add(net, prot, 1);
242 sk->sk_socket->ops = &inet_dgram_ops;
243 sk->sk_family = PF_INET;
246 /* Disable all options not to allocate memory anymore,
247 * but there is still a race. See the lockless path
248 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
252 inet6_cleanup_sock(sk);
255 * ... and add it to the refcnt debug socks count
256 * in the new family. -acme
258 sk_refcnt_debug_inc(sk);
259 module_put(THIS_MODULE);
266 if (optlen < sizeof(int) ||
267 inet_sk(sk)->inet_num)
269 sk->sk_ipv6only = valbool;
273 case IPV6_RECVPKTINFO:
274 if (optlen < sizeof(int))
276 np->rxopt.bits.rxinfo = valbool;
280 case IPV6_2292PKTINFO:
281 if (optlen < sizeof(int))
283 np->rxopt.bits.rxoinfo = valbool;
287 case IPV6_RECVHOPLIMIT:
288 if (optlen < sizeof(int))
290 np->rxopt.bits.rxhlim = valbool;
294 case IPV6_2292HOPLIMIT:
295 if (optlen < sizeof(int))
297 np->rxopt.bits.rxohlim = valbool;
302 if (optlen < sizeof(int))
304 np->rxopt.bits.srcrt = valbool;
309 if (optlen < sizeof(int))
311 np->rxopt.bits.osrcrt = valbool;
315 case IPV6_RECVHOPOPTS:
316 if (optlen < sizeof(int))
318 np->rxopt.bits.hopopts = valbool;
322 case IPV6_2292HOPOPTS:
323 if (optlen < sizeof(int))
325 np->rxopt.bits.ohopopts = valbool;
329 case IPV6_RECVDSTOPTS:
330 if (optlen < sizeof(int))
332 np->rxopt.bits.dstopts = valbool;
336 case IPV6_2292DSTOPTS:
337 if (optlen < sizeof(int))
339 np->rxopt.bits.odstopts = valbool;
344 if (optlen < sizeof(int))
346 if (val < -1 || val > 0xff)
348 /* RFC 3542, 6.5: default traffic class of 0x0 */
355 case IPV6_RECVTCLASS:
356 if (optlen < sizeof(int))
358 np->rxopt.bits.rxtclass = valbool;
363 if (optlen < sizeof(int))
365 np->rxopt.bits.rxflow = valbool;
369 case IPV6_RECVPATHMTU:
370 if (optlen < sizeof(int))
372 np->rxopt.bits.rxpmtu = valbool;
376 case IPV6_TRANSPARENT:
377 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
378 !ns_capable(net->user_ns, CAP_NET_RAW)) {
382 if (optlen < sizeof(int))
384 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
385 inet_sk(sk)->transparent = valbool;
389 case IPV6_RECVORIGDSTADDR:
390 if (optlen < sizeof(int))
392 np->rxopt.bits.rxorigdstaddr = valbool;
397 case IPV6_RTHDRDSTOPTS:
401 struct ipv6_txoptions *opt;
402 struct ipv6_opt_hdr *new = NULL;
404 /* hop-by-hop / destination options are privileged option */
406 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
409 /* remove any sticky options header with a zero option
410 * length, per RFC3542.
416 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
417 optlen & 0x7 || optlen > 8 * 255)
420 new = memdup_user(optval, optlen);
425 if (unlikely(ipv6_optlen(new) > optlen)) {
431 opt = rcu_dereference_protected(np->opt,
432 lockdep_sock_is_held(sk));
433 opt = ipv6_renew_options(sk, opt, optname, new);
440 /* routing header option needs extra check */
442 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
443 struct ipv6_rt_hdr *rthdr = opt->srcrt;
444 switch (rthdr->type) {
445 #if IS_ENABLED(CONFIG_IPV6_MIP6)
446 case IPV6_SRCRT_TYPE_2:
447 if (rthdr->hdrlen != 2 ||
448 rthdr->segments_left != 1)
453 case IPV6_SRCRT_TYPE_4:
455 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
458 if (!seg6_validate_srh(srh, optlen))
468 opt = ipv6_update_options(sk, opt);
471 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
479 struct in6_pktinfo pkt;
483 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
486 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
490 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
493 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
494 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
499 case IPV6_2292PKTOPTIONS:
501 struct ipv6_txoptions *opt = NULL;
504 struct sockcm_cookie sockc_junk;
505 struct ipcm6_cookie ipc6;
507 memset(&fl6, 0, sizeof(fl6));
508 fl6.flowi6_oif = sk->sk_bound_dev_if;
509 fl6.flowi6_mark = sk->sk_mark;
514 /* 1K is probably excessive
515 * 1K is surely not enough, 2K per standard header is 16K.
518 if (optlen > 64*1024)
521 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
526 memset(opt, 0, sizeof(*opt));
527 refcount_set(&opt->refcnt, 1);
528 opt->tot_len = sizeof(*opt) + optlen;
530 if (copy_from_user(opt+1, optval, optlen))
533 msg.msg_controllen = optlen;
534 msg.msg_control = (void *)(opt+1);
537 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
542 opt = ipv6_update_options(sk, opt);
545 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
550 case IPV6_UNICAST_HOPS:
551 if (optlen < sizeof(int))
553 if (val > 255 || val < -1)
559 case IPV6_MULTICAST_HOPS:
560 if (sk->sk_type == SOCK_STREAM)
562 if (optlen < sizeof(int))
564 if (val > 255 || val < -1)
566 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
570 case IPV6_MULTICAST_LOOP:
571 if (optlen < sizeof(int))
575 np->mc_loop = valbool;
579 case IPV6_UNICAST_IF:
581 struct net_device *dev = NULL;
584 if (optlen != sizeof(int))
587 ifindex = (__force int)ntohl((__force __be32)val);
594 dev = dev_get_by_index(net, ifindex);
595 retv = -EADDRNOTAVAIL;
601 if (sk->sk_bound_dev_if)
604 np->ucast_oif = ifindex;
609 case IPV6_MULTICAST_IF:
610 if (sk->sk_type == SOCK_STREAM)
612 if (optlen < sizeof(int))
616 struct net_device *dev;
621 dev = dev_get_by_index_rcu(net, val);
627 midx = l3mdev_master_ifindex_rcu(dev);
631 if (sk->sk_bound_dev_if &&
632 sk->sk_bound_dev_if != val &&
633 (!midx || midx != sk->sk_bound_dev_if))
639 case IPV6_ADD_MEMBERSHIP:
640 case IPV6_DROP_MEMBERSHIP:
642 struct ipv6_mreq mreq;
644 if (optlen < sizeof(struct ipv6_mreq))
648 if (inet_sk(sk)->is_icsk)
652 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
655 if (optname == IPV6_ADD_MEMBERSHIP)
656 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
658 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
661 case IPV6_JOIN_ANYCAST:
662 case IPV6_LEAVE_ANYCAST:
664 struct ipv6_mreq mreq;
666 if (optlen < sizeof(struct ipv6_mreq))
670 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
673 if (optname == IPV6_JOIN_ANYCAST)
674 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
676 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
679 case MCAST_JOIN_GROUP:
680 case MCAST_LEAVE_GROUP:
682 struct group_req greq;
683 struct sockaddr_in6 *psin6;
685 if (optlen < sizeof(struct group_req))
689 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
691 if (greq.gr_group.ss_family != AF_INET6) {
692 retv = -EADDRNOTAVAIL;
695 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
696 if (optname == MCAST_JOIN_GROUP)
697 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
700 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
704 case MCAST_JOIN_SOURCE_GROUP:
705 case MCAST_LEAVE_SOURCE_GROUP:
706 case MCAST_BLOCK_SOURCE:
707 case MCAST_UNBLOCK_SOURCE:
709 struct group_source_req greqs;
712 if (optlen < sizeof(struct group_source_req))
714 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
718 if (greqs.gsr_group.ss_family != AF_INET6 ||
719 greqs.gsr_source.ss_family != AF_INET6) {
720 retv = -EADDRNOTAVAIL;
723 if (optname == MCAST_BLOCK_SOURCE) {
724 omode = MCAST_EXCLUDE;
726 } else if (optname == MCAST_UNBLOCK_SOURCE) {
727 omode = MCAST_EXCLUDE;
729 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
730 struct sockaddr_in6 *psin6;
732 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
733 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
735 /* prior join w/ different source is ok */
736 if (retv && retv != -EADDRINUSE)
738 omode = MCAST_INCLUDE;
740 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
741 omode = MCAST_INCLUDE;
744 retv = ip6_mc_source(add, omode, sk, &greqs);
749 struct group_filter *gsf;
751 if (optlen < GROUP_FILTER_SIZE(0))
753 if (optlen > sysctl_optmem_max) {
757 gsf = memdup_user(optval, optlen);
762 /* numsrc >= (4G-140)/128 overflow in 32 bits */
763 if (gsf->gf_numsrc >= 0x1ffffffU ||
764 gsf->gf_numsrc > sysctl_mld_max_msf) {
769 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
774 retv = ip6_mc_msfilter(sk, gsf);
779 case IPV6_ROUTER_ALERT:
780 if (optlen < sizeof(int))
782 retv = ip6_ra_control(sk, val);
784 case IPV6_MTU_DISCOVER:
785 if (optlen < sizeof(int))
787 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
793 if (optlen < sizeof(int))
795 if (val && val < IPV6_MIN_MTU)
801 if (optlen < sizeof(int))
803 np->recverr = valbool;
805 skb_queue_purge(&sk->sk_error_queue);
808 case IPV6_FLOWINFO_SEND:
809 if (optlen < sizeof(int))
811 np->sndflow = valbool;
814 case IPV6_FLOWLABEL_MGR:
815 retv = ipv6_flowlabel_opt(sk, optval, optlen);
817 case IPV6_IPSEC_POLICY:
818 case IPV6_XFRM_POLICY:
820 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
822 retv = xfrm_user_policy(sk, optname, optval, optlen);
825 case IPV6_ADDR_PREFERENCES:
827 unsigned int pref = 0;
828 unsigned int prefmask = ~0;
830 if (optlen < sizeof(int))
835 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
836 switch (val & (IPV6_PREFER_SRC_PUBLIC|
838 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
839 case IPV6_PREFER_SRC_PUBLIC:
840 pref |= IPV6_PREFER_SRC_PUBLIC;
842 case IPV6_PREFER_SRC_TMP:
843 pref |= IPV6_PREFER_SRC_TMP;
845 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
848 goto pref_skip_pubtmp;
853 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
854 IPV6_PREFER_SRC_TMP);
857 /* check HOME/COA conflicts */
858 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
859 case IPV6_PREFER_SRC_HOME:
861 case IPV6_PREFER_SRC_COA:
862 pref |= IPV6_PREFER_SRC_COA;
869 prefmask &= ~IPV6_PREFER_SRC_COA;
872 /* check CGA/NONCGA conflicts */
873 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
874 case IPV6_PREFER_SRC_CGA:
875 case IPV6_PREFER_SRC_NONCGA:
882 np->srcprefs = (np->srcprefs & prefmask) | pref;
887 case IPV6_MINHOPCOUNT:
888 if (optlen < sizeof(int))
890 if (val < 0 || val > 255)
892 np->min_hopcount = val;
896 np->dontfrag = valbool;
899 case IPV6_AUTOFLOWLABEL:
900 np->autoflowlabel = valbool;
901 np->autoflowlabel_set = 1;
904 case IPV6_RECVFRAGSIZE:
905 np->rxopt.bits.recvfragsize = valbool;
924 int ipv6_setsockopt(struct sock *sk, int level, int optname,
925 char __user *optval, unsigned int optlen)
929 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
930 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
932 if (level != SOL_IPV6)
935 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
936 #ifdef CONFIG_NETFILTER
937 /* we need to exclude all possible ENOPROTOOPTs except default case */
938 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
939 optname != IPV6_XFRM_POLICY)
940 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
944 EXPORT_SYMBOL(ipv6_setsockopt);
947 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
948 char __user *optval, unsigned int optlen)
952 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
953 if (udp_prot.compat_setsockopt != NULL)
954 return udp_prot.compat_setsockopt(sk, level, optname,
956 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
959 if (level != SOL_IPV6)
962 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
963 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
966 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
967 #ifdef CONFIG_NETFILTER
968 /* we need to exclude all possible ENOPROTOOPTs except default case */
969 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
970 optname != IPV6_XFRM_POLICY)
971 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
976 EXPORT_SYMBOL(compat_ipv6_setsockopt);
979 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
980 int optname, char __user *optval, int len)
982 struct ipv6_opt_hdr *hdr;
991 case IPV6_RTHDRDSTOPTS:
995 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1001 return -EINVAL; /* should not happen */
1007 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1008 if (copy_to_user(optval, hdr, len))
1013 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1014 char __user *optval, int __user *optlen, unsigned int flags)
1016 struct ipv6_pinfo *np = inet6_sk(sk);
1020 if (ip6_mroute_opt(optname))
1021 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1023 if (get_user(len, optlen))
1027 if (sk->sk_protocol != IPPROTO_UDP &&
1028 sk->sk_protocol != IPPROTO_UDPLITE &&
1029 sk->sk_protocol != IPPROTO_TCP)
1030 return -ENOPROTOOPT;
1031 if (sk->sk_state != TCP_ESTABLISHED)
1033 val = sk->sk_family;
1035 case MCAST_MSFILTER:
1037 struct group_filter gsf;
1040 if (len < GROUP_FILTER_SIZE(0))
1042 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1044 if (gsf.gf_group.ss_family != AF_INET6)
1045 return -EADDRNOTAVAIL;
1047 err = ip6_mc_msfget(sk, &gsf,
1048 (struct group_filter __user *)optval, optlen);
1053 case IPV6_2292PKTOPTIONS:
1056 struct sk_buff *skb;
1058 if (sk->sk_type != SOCK_STREAM)
1059 return -ENOPROTOOPT;
1061 msg.msg_control = optval;
1062 msg.msg_controllen = len;
1063 msg.msg_flags = flags;
1066 skb = np->pktoptions;
1068 ip6_datagram_recv_ctl(sk, &msg, skb);
1071 if (np->rxopt.bits.rxinfo) {
1072 struct in6_pktinfo src_info;
1073 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1074 np->sticky_pktinfo.ipi6_ifindex;
1075 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1076 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1078 if (np->rxopt.bits.rxhlim) {
1079 int hlim = np->mcast_hops;
1080 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1082 if (np->rxopt.bits.rxtclass) {
1083 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1085 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1087 if (np->rxopt.bits.rxoinfo) {
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 :
1092 np->sticky_pktinfo.ipi6_addr;
1093 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1095 if (np->rxopt.bits.rxohlim) {
1096 int hlim = np->mcast_hops;
1097 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1099 if (np->rxopt.bits.rxflow) {
1100 __be32 flowinfo = np->rcv_flowinfo;
1102 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1105 len -= msg.msg_controllen;
1106 return put_user(len, optlen);
1110 struct dst_entry *dst;
1114 dst = __sk_dst_get(sk);
1124 val = sk->sk_ipv6only;
1127 case IPV6_RECVPKTINFO:
1128 val = np->rxopt.bits.rxinfo;
1131 case IPV6_2292PKTINFO:
1132 val = np->rxopt.bits.rxoinfo;
1135 case IPV6_RECVHOPLIMIT:
1136 val = np->rxopt.bits.rxhlim;
1139 case IPV6_2292HOPLIMIT:
1140 val = np->rxopt.bits.rxohlim;
1143 case IPV6_RECVRTHDR:
1144 val = np->rxopt.bits.srcrt;
1147 case IPV6_2292RTHDR:
1148 val = np->rxopt.bits.osrcrt;
1152 case IPV6_RTHDRDSTOPTS:
1156 struct ipv6_txoptions *opt;
1159 opt = rcu_dereference_protected(np->opt,
1160 lockdep_sock_is_held(sk));
1161 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1163 /* check if ipv6_getsockopt_sticky() returns err code */
1166 return put_user(len, optlen);
1169 case IPV6_RECVHOPOPTS:
1170 val = np->rxopt.bits.hopopts;
1173 case IPV6_2292HOPOPTS:
1174 val = np->rxopt.bits.ohopopts;
1177 case IPV6_RECVDSTOPTS:
1178 val = np->rxopt.bits.dstopts;
1181 case IPV6_2292DSTOPTS:
1182 val = np->rxopt.bits.odstopts;
1189 case IPV6_RECVTCLASS:
1190 val = np->rxopt.bits.rxtclass;
1194 val = np->rxopt.bits.rxflow;
1197 case IPV6_RECVPATHMTU:
1198 val = np->rxopt.bits.rxpmtu;
1203 struct dst_entry *dst;
1204 struct ip6_mtuinfo mtuinfo;
1206 if (len < sizeof(mtuinfo))
1209 len = sizeof(mtuinfo);
1210 memset(&mtuinfo, 0, sizeof(mtuinfo));
1213 dst = __sk_dst_get(sk);
1215 mtuinfo.ip6m_mtu = dst_mtu(dst);
1217 if (!mtuinfo.ip6m_mtu)
1220 if (put_user(len, optlen))
1222 if (copy_to_user(optval, &mtuinfo, len))
1228 case IPV6_TRANSPARENT:
1229 val = inet_sk(sk)->transparent;
1232 case IPV6_RECVORIGDSTADDR:
1233 val = np->rxopt.bits.rxorigdstaddr;
1236 case IPV6_UNICAST_HOPS:
1237 case IPV6_MULTICAST_HOPS:
1239 struct dst_entry *dst;
1241 if (optname == IPV6_UNICAST_HOPS)
1242 val = np->hop_limit;
1244 val = np->mcast_hops;
1248 dst = __sk_dst_get(sk);
1250 val = ip6_dst_hoplimit(dst);
1255 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1259 case IPV6_MULTICAST_LOOP:
1263 case IPV6_MULTICAST_IF:
1264 val = np->mcast_oif;
1267 case IPV6_UNICAST_IF:
1268 val = (__force int)htonl((__u32) np->ucast_oif);
1271 case IPV6_MTU_DISCOVER:
1279 case IPV6_FLOWINFO_SEND:
1283 case IPV6_FLOWLABEL_MGR:
1285 struct in6_flowlabel_req freq;
1288 if (len < sizeof(freq))
1291 if (copy_from_user(&freq, optval, sizeof(freq)))
1294 if (freq.flr_action != IPV6_FL_A_GET)
1298 flags = freq.flr_flags;
1300 memset(&freq, 0, sizeof(freq));
1302 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1306 if (put_user(len, optlen))
1308 if (copy_to_user(optval, &freq, len))
1314 case IPV6_ADDR_PREFERENCES:
1317 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1318 val |= IPV6_PREFER_SRC_TMP;
1319 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1320 val |= IPV6_PREFER_SRC_PUBLIC;
1322 /* XXX: should we return system default? */
1323 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1326 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1327 val |= IPV6_PREFER_SRC_COA;
1329 val |= IPV6_PREFER_SRC_HOME;
1332 case IPV6_MINHOPCOUNT:
1333 val = np->min_hopcount;
1340 case IPV6_AUTOFLOWLABEL:
1341 val = ip6_autoflowlabel(sock_net(sk), np);
1344 case IPV6_RECVFRAGSIZE:
1345 val = np->rxopt.bits.recvfragsize;
1349 return -ENOPROTOOPT;
1351 len = min_t(unsigned int, sizeof(int), len);
1352 if (put_user(len, optlen))
1354 if (copy_to_user(optval, &val, len))
1359 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1360 char __user *optval, int __user *optlen)
1364 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1365 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1367 if (level != SOL_IPV6)
1368 return -ENOPROTOOPT;
1370 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1371 #ifdef CONFIG_NETFILTER
1372 /* we need to exclude all possible ENOPROTOOPTs except default case */
1373 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1376 if (get_user(len, optlen))
1379 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1381 err = put_user(len, optlen);
1386 EXPORT_SYMBOL(ipv6_getsockopt);
1388 #ifdef CONFIG_COMPAT
1389 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1390 char __user *optval, int __user *optlen)
1394 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1395 if (udp_prot.compat_getsockopt != NULL)
1396 return udp_prot.compat_getsockopt(sk, level, optname,
1398 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1401 if (level != SOL_IPV6)
1402 return -ENOPROTOOPT;
1404 if (optname == MCAST_MSFILTER)
1405 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1408 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1410 #ifdef CONFIG_NETFILTER
1411 /* we need to exclude all possible ENOPROTOOPTs except default case */
1412 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1415 if (get_user(len, optlen))
1418 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1420 err = put_user(len, optlen);
1425 EXPORT_SYMBOL(compat_ipv6_getsockopt);