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);
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);
172 if (optlen < sizeof(int))
174 if (val == PF_INET) {
175 struct ipv6_txoptions *opt;
176 struct sk_buff *pktopt;
178 if (sk->sk_type == SOCK_RAW)
181 if (sk->sk_protocol == IPPROTO_UDP ||
182 sk->sk_protocol == IPPROTO_UDPLITE) {
183 struct udp_sock *up = udp_sk(sk);
184 if (up->pending == AF_INET6) {
188 } else if (sk->sk_protocol == IPPROTO_TCP) {
189 if (sk->sk_prot != &tcpv6_prot) {
197 if (sk->sk_state != TCP_ESTABLISHED) {
202 if (ipv6_only_sock(sk) ||
203 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
204 retv = -EADDRNOTAVAIL;
208 fl6_free_socklist(sk);
209 __ipv6_sock_mc_close(sk);
210 __ipv6_sock_ac_close(sk);
213 * Sock is moving from IPv6 to IPv4 (sk_prot), so
214 * remove it from the refcnt debug socks count in the
217 sk_refcnt_debug_dec(sk);
219 if (sk->sk_protocol == IPPROTO_TCP) {
220 struct inet_connection_sock *icsk = inet_csk(sk);
222 sock_prot_inuse_add(net, sk->sk_prot, -1);
223 sock_prot_inuse_add(net, &tcp_prot, 1);
225 sk->sk_prot = &tcp_prot;
226 icsk->icsk_af_ops = &ipv4_specific;
227 sk->sk_socket->ops = &inet_stream_ops;
228 sk->sk_family = PF_INET;
229 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
231 struct proto *prot = &udp_prot;
233 if (sk->sk_protocol == IPPROTO_UDPLITE)
234 prot = &udplite_prot;
236 sock_prot_inuse_add(net, sk->sk_prot, -1);
237 sock_prot_inuse_add(net, prot, 1);
240 sk->sk_socket->ops = &inet_dgram_ops;
241 sk->sk_family = PF_INET;
243 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
246 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
249 pktopt = xchg(&np->pktoptions, NULL);
252 sk->sk_destruct = inet_sock_destruct;
254 * ... and add it to the refcnt debug socks count
255 * in the new family. -acme
257 sk_refcnt_debug_inc(sk);
258 module_put(THIS_MODULE);
265 if (optlen < sizeof(int) ||
266 inet_sk(sk)->inet_num)
268 sk->sk_ipv6only = valbool;
272 case IPV6_RECVPKTINFO:
273 if (optlen < sizeof(int))
275 np->rxopt.bits.rxinfo = valbool;
279 case IPV6_2292PKTINFO:
280 if (optlen < sizeof(int))
282 np->rxopt.bits.rxoinfo = valbool;
286 case IPV6_RECVHOPLIMIT:
287 if (optlen < sizeof(int))
289 np->rxopt.bits.rxhlim = valbool;
293 case IPV6_2292HOPLIMIT:
294 if (optlen < sizeof(int))
296 np->rxopt.bits.rxohlim = valbool;
301 if (optlen < sizeof(int))
303 np->rxopt.bits.srcrt = valbool;
308 if (optlen < sizeof(int))
310 np->rxopt.bits.osrcrt = valbool;
314 case IPV6_RECVHOPOPTS:
315 if (optlen < sizeof(int))
317 np->rxopt.bits.hopopts = valbool;
321 case IPV6_2292HOPOPTS:
322 if (optlen < sizeof(int))
324 np->rxopt.bits.ohopopts = valbool;
328 case IPV6_RECVDSTOPTS:
329 if (optlen < sizeof(int))
331 np->rxopt.bits.dstopts = valbool;
335 case IPV6_2292DSTOPTS:
336 if (optlen < sizeof(int))
338 np->rxopt.bits.odstopts = valbool;
343 if (optlen < sizeof(int))
345 if (val < -1 || val > 0xff)
347 /* RFC 3542, 6.5: default traffic class of 0x0 */
354 case IPV6_RECVTCLASS:
355 if (optlen < sizeof(int))
357 np->rxopt.bits.rxtclass = valbool;
362 if (optlen < sizeof(int))
364 np->rxopt.bits.rxflow = valbool;
368 case IPV6_RECVPATHMTU:
369 if (optlen < sizeof(int))
371 np->rxopt.bits.rxpmtu = valbool;
375 case IPV6_TRANSPARENT:
376 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
377 !ns_capable(net->user_ns, CAP_NET_RAW)) {
381 if (optlen < sizeof(int))
383 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
384 inet_sk(sk)->transparent = valbool;
388 case IPV6_RECVORIGDSTADDR:
389 if (optlen < sizeof(int))
391 np->rxopt.bits.rxorigdstaddr = valbool;
396 case IPV6_RTHDRDSTOPTS:
400 struct ipv6_txoptions *opt;
402 /* remove any sticky options header with a zero option
403 * length, per RFC3542.
409 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
410 optlen & 0x7 || optlen > 8 * 255)
413 /* hop-by-hop / destination options are privileged option */
415 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
418 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
419 opt = ipv6_renew_options(sk, opt, optname,
420 (struct ipv6_opt_hdr __user *)optval,
427 /* routing header option needs extra check */
429 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
430 struct ipv6_rt_hdr *rthdr = opt->srcrt;
431 switch (rthdr->type) {
432 #if IS_ENABLED(CONFIG_IPV6_MIP6)
433 case IPV6_SRCRT_TYPE_2:
434 if (rthdr->hdrlen != 2 ||
435 rthdr->segments_left != 1)
446 opt = ipv6_update_options(sk, opt);
449 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
457 struct in6_pktinfo pkt;
461 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
464 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
468 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
471 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
472 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
477 case IPV6_2292PKTOPTIONS:
479 struct ipv6_txoptions *opt = NULL;
484 memset(&fl6, 0, sizeof(fl6));
485 fl6.flowi6_oif = sk->sk_bound_dev_if;
486 fl6.flowi6_mark = sk->sk_mark;
491 /* 1K is probably excessive
492 * 1K is surely not enough, 2K per standard header is 16K.
495 if (optlen > 64*1024)
498 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
503 memset(opt, 0, sizeof(*opt));
504 atomic_set(&opt->refcnt, 1);
505 opt->tot_len = sizeof(*opt) + optlen;
507 if (copy_from_user(opt+1, optval, optlen))
510 msg.msg_controllen = optlen;
511 msg.msg_control = (void *)(opt+1);
513 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
519 opt = ipv6_update_options(sk, opt);
522 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
527 case IPV6_UNICAST_HOPS:
528 if (optlen < sizeof(int))
530 if (val > 255 || val < -1)
536 case IPV6_MULTICAST_HOPS:
537 if (sk->sk_type == SOCK_STREAM)
539 if (optlen < sizeof(int))
541 if (val > 255 || val < -1)
543 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
547 case IPV6_MULTICAST_LOOP:
548 if (optlen < sizeof(int))
552 np->mc_loop = valbool;
556 case IPV6_UNICAST_IF:
558 struct net_device *dev = NULL;
561 if (optlen != sizeof(int))
564 ifindex = (__force int)ntohl((__force __be32)val);
571 dev = dev_get_by_index(net, ifindex);
572 retv = -EADDRNOTAVAIL;
578 if (sk->sk_bound_dev_if)
581 np->ucast_oif = ifindex;
586 case IPV6_MULTICAST_IF:
587 if (sk->sk_type == SOCK_STREAM)
589 if (optlen < sizeof(int))
593 struct net_device *dev;
598 dev = dev_get_by_index_rcu(net, val);
604 midx = l3mdev_master_ifindex_rcu(dev);
608 if (sk->sk_bound_dev_if &&
609 sk->sk_bound_dev_if != val &&
610 (!midx || midx != sk->sk_bound_dev_if))
616 case IPV6_ADD_MEMBERSHIP:
617 case IPV6_DROP_MEMBERSHIP:
619 struct ipv6_mreq mreq;
621 if (optlen < sizeof(struct ipv6_mreq))
625 if (inet_sk(sk)->is_icsk)
629 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
632 if (optname == IPV6_ADD_MEMBERSHIP)
633 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
635 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
638 case IPV6_JOIN_ANYCAST:
639 case IPV6_LEAVE_ANYCAST:
641 struct ipv6_mreq mreq;
643 if (optlen < sizeof(struct ipv6_mreq))
647 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
650 if (optname == IPV6_JOIN_ANYCAST)
651 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
653 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
656 case MCAST_JOIN_GROUP:
657 case MCAST_LEAVE_GROUP:
659 struct group_req greq;
660 struct sockaddr_in6 *psin6;
662 if (optlen < sizeof(struct group_req))
666 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
668 if (greq.gr_group.ss_family != AF_INET6) {
669 retv = -EADDRNOTAVAIL;
672 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
673 if (optname == MCAST_JOIN_GROUP)
674 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
677 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
681 case MCAST_JOIN_SOURCE_GROUP:
682 case MCAST_LEAVE_SOURCE_GROUP:
683 case MCAST_BLOCK_SOURCE:
684 case MCAST_UNBLOCK_SOURCE:
686 struct group_source_req greqs;
689 if (optlen < sizeof(struct group_source_req))
691 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
695 if (greqs.gsr_group.ss_family != AF_INET6 ||
696 greqs.gsr_source.ss_family != AF_INET6) {
697 retv = -EADDRNOTAVAIL;
700 if (optname == MCAST_BLOCK_SOURCE) {
701 omode = MCAST_EXCLUDE;
703 } else if (optname == MCAST_UNBLOCK_SOURCE) {
704 omode = MCAST_EXCLUDE;
706 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
707 struct sockaddr_in6 *psin6;
709 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
710 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
712 /* prior join w/ different source is ok */
713 if (retv && retv != -EADDRINUSE)
715 omode = MCAST_INCLUDE;
717 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
718 omode = MCAST_INCLUDE;
721 retv = ip6_mc_source(add, omode, sk, &greqs);
726 struct group_filter *gsf;
728 if (optlen < GROUP_FILTER_SIZE(0))
730 if (optlen > sysctl_optmem_max) {
734 gsf = kmalloc(optlen, GFP_KERNEL);
740 if (copy_from_user(gsf, optval, optlen)) {
744 /* numsrc >= (4G-140)/128 overflow in 32 bits */
745 if (gsf->gf_numsrc >= 0x1ffffffU ||
746 gsf->gf_numsrc > sysctl_mld_max_msf) {
751 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
756 retv = ip6_mc_msfilter(sk, gsf);
761 case IPV6_ROUTER_ALERT:
762 if (optlen < sizeof(int))
764 retv = ip6_ra_control(sk, val);
766 case IPV6_MTU_DISCOVER:
767 if (optlen < sizeof(int))
769 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
775 if (optlen < sizeof(int))
777 if (val && val < IPV6_MIN_MTU)
783 if (optlen < sizeof(int))
785 np->recverr = valbool;
787 skb_queue_purge(&sk->sk_error_queue);
790 case IPV6_FLOWINFO_SEND:
791 if (optlen < sizeof(int))
793 np->sndflow = valbool;
796 case IPV6_FLOWLABEL_MGR:
797 retv = ipv6_flowlabel_opt(sk, optval, optlen);
799 case IPV6_IPSEC_POLICY:
800 case IPV6_XFRM_POLICY:
802 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
804 retv = xfrm_user_policy(sk, optname, optval, optlen);
807 case IPV6_ADDR_PREFERENCES:
809 unsigned int pref = 0;
810 unsigned int prefmask = ~0;
812 if (optlen < sizeof(int))
817 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
818 switch (val & (IPV6_PREFER_SRC_PUBLIC|
820 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
821 case IPV6_PREFER_SRC_PUBLIC:
822 pref |= IPV6_PREFER_SRC_PUBLIC;
824 case IPV6_PREFER_SRC_TMP:
825 pref |= IPV6_PREFER_SRC_TMP;
827 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
830 goto pref_skip_pubtmp;
835 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
836 IPV6_PREFER_SRC_TMP);
839 /* check HOME/COA conflicts */
840 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
841 case IPV6_PREFER_SRC_HOME:
843 case IPV6_PREFER_SRC_COA:
844 pref |= IPV6_PREFER_SRC_COA;
851 prefmask &= ~IPV6_PREFER_SRC_COA;
854 /* check CGA/NONCGA conflicts */
855 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
856 case IPV6_PREFER_SRC_CGA:
857 case IPV6_PREFER_SRC_NONCGA:
864 np->srcprefs = (np->srcprefs & prefmask) | pref;
869 case IPV6_MINHOPCOUNT:
870 if (optlen < sizeof(int))
872 if (val < 0 || val > 255)
874 np->min_hopcount = val;
878 np->dontfrag = valbool;
881 case IPV6_AUTOFLOWLABEL:
882 np->autoflowlabel = valbool;
883 np->autoflowlabel_set = 1;
901 int ipv6_setsockopt(struct sock *sk, int level, int optname,
902 char __user *optval, unsigned int optlen)
906 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
907 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
909 if (level != SOL_IPV6)
912 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
913 #ifdef CONFIG_NETFILTER
914 /* we need to exclude all possible ENOPROTOOPTs except default case */
915 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
916 optname != IPV6_XFRM_POLICY)
917 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
921 EXPORT_SYMBOL(ipv6_setsockopt);
924 int compat_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 if (udp_prot.compat_setsockopt != NULL)
931 return udp_prot.compat_setsockopt(sk, level, optname,
933 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
936 if (level != SOL_IPV6)
939 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
940 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
943 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
944 #ifdef CONFIG_NETFILTER
945 /* we need to exclude all possible ENOPROTOOPTs except default case */
946 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
947 optname != IPV6_XFRM_POLICY)
948 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
953 EXPORT_SYMBOL(compat_ipv6_setsockopt);
956 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
957 int optname, char __user *optval, int len)
959 struct ipv6_opt_hdr *hdr;
968 case IPV6_RTHDRDSTOPTS:
972 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
978 return -EINVAL; /* should not happen */
984 len = min_t(unsigned int, len, ipv6_optlen(hdr));
985 if (copy_to_user(optval, hdr, len))
990 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
991 char __user *optval, int __user *optlen, unsigned int flags)
993 struct ipv6_pinfo *np = inet6_sk(sk);
997 if (ip6_mroute_opt(optname))
998 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1000 if (get_user(len, optlen))
1004 if (sk->sk_protocol != IPPROTO_UDP &&
1005 sk->sk_protocol != IPPROTO_UDPLITE &&
1006 sk->sk_protocol != IPPROTO_TCP)
1007 return -ENOPROTOOPT;
1008 if (sk->sk_state != TCP_ESTABLISHED)
1010 val = sk->sk_family;
1012 case MCAST_MSFILTER:
1014 struct group_filter gsf;
1017 if (len < GROUP_FILTER_SIZE(0))
1019 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1021 if (gsf.gf_group.ss_family != AF_INET6)
1022 return -EADDRNOTAVAIL;
1024 err = ip6_mc_msfget(sk, &gsf,
1025 (struct group_filter __user *)optval, optlen);
1030 case IPV6_2292PKTOPTIONS:
1033 struct sk_buff *skb;
1035 if (sk->sk_type != SOCK_STREAM)
1036 return -ENOPROTOOPT;
1038 msg.msg_control = optval;
1039 msg.msg_controllen = len;
1040 msg.msg_flags = flags;
1043 skb = np->pktoptions;
1045 ip6_datagram_recv_ctl(sk, &msg, skb);
1048 if (np->rxopt.bits.rxinfo) {
1049 struct in6_pktinfo src_info;
1050 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1051 np->sticky_pktinfo.ipi6_ifindex;
1052 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1053 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1055 if (np->rxopt.bits.rxhlim) {
1056 int hlim = np->mcast_hops;
1057 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1059 if (np->rxopt.bits.rxtclass) {
1060 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1062 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1064 if (np->rxopt.bits.rxoinfo) {
1065 struct in6_pktinfo src_info;
1066 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1067 np->sticky_pktinfo.ipi6_ifindex;
1068 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1069 np->sticky_pktinfo.ipi6_addr;
1070 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1072 if (np->rxopt.bits.rxohlim) {
1073 int hlim = np->mcast_hops;
1074 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1076 if (np->rxopt.bits.rxflow) {
1077 __be32 flowinfo = np->rcv_flowinfo;
1079 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1082 len -= msg.msg_controllen;
1083 return put_user(len, optlen);
1087 struct dst_entry *dst;
1091 dst = __sk_dst_get(sk);
1101 val = sk->sk_ipv6only;
1104 case IPV6_RECVPKTINFO:
1105 val = np->rxopt.bits.rxinfo;
1108 case IPV6_2292PKTINFO:
1109 val = np->rxopt.bits.rxoinfo;
1112 case IPV6_RECVHOPLIMIT:
1113 val = np->rxopt.bits.rxhlim;
1116 case IPV6_2292HOPLIMIT:
1117 val = np->rxopt.bits.rxohlim;
1120 case IPV6_RECVRTHDR:
1121 val = np->rxopt.bits.srcrt;
1124 case IPV6_2292RTHDR:
1125 val = np->rxopt.bits.osrcrt;
1129 case IPV6_RTHDRDSTOPTS:
1133 struct ipv6_txoptions *opt;
1136 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1137 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1139 /* check if ipv6_getsockopt_sticky() returns err code */
1142 return put_user(len, optlen);
1145 case IPV6_RECVHOPOPTS:
1146 val = np->rxopt.bits.hopopts;
1149 case IPV6_2292HOPOPTS:
1150 val = np->rxopt.bits.ohopopts;
1153 case IPV6_RECVDSTOPTS:
1154 val = np->rxopt.bits.dstopts;
1157 case IPV6_2292DSTOPTS:
1158 val = np->rxopt.bits.odstopts;
1165 case IPV6_RECVTCLASS:
1166 val = np->rxopt.bits.rxtclass;
1170 val = np->rxopt.bits.rxflow;
1173 case IPV6_RECVPATHMTU:
1174 val = np->rxopt.bits.rxpmtu;
1179 struct dst_entry *dst;
1180 struct ip6_mtuinfo mtuinfo;
1182 if (len < sizeof(mtuinfo))
1185 len = sizeof(mtuinfo);
1186 memset(&mtuinfo, 0, sizeof(mtuinfo));
1189 dst = __sk_dst_get(sk);
1191 mtuinfo.ip6m_mtu = dst_mtu(dst);
1193 if (!mtuinfo.ip6m_mtu)
1196 if (put_user(len, optlen))
1198 if (copy_to_user(optval, &mtuinfo, len))
1204 case IPV6_TRANSPARENT:
1205 val = inet_sk(sk)->transparent;
1208 case IPV6_RECVORIGDSTADDR:
1209 val = np->rxopt.bits.rxorigdstaddr;
1212 case IPV6_UNICAST_HOPS:
1213 case IPV6_MULTICAST_HOPS:
1215 struct dst_entry *dst;
1217 if (optname == IPV6_UNICAST_HOPS)
1218 val = np->hop_limit;
1220 val = np->mcast_hops;
1224 dst = __sk_dst_get(sk);
1226 val = ip6_dst_hoplimit(dst);
1231 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1235 case IPV6_MULTICAST_LOOP:
1239 case IPV6_MULTICAST_IF:
1240 val = np->mcast_oif;
1243 case IPV6_UNICAST_IF:
1244 val = (__force int)htonl((__u32) np->ucast_oif);
1247 case IPV6_MTU_DISCOVER:
1255 case IPV6_FLOWINFO_SEND:
1259 case IPV6_FLOWLABEL_MGR:
1261 struct in6_flowlabel_req freq;
1264 if (len < sizeof(freq))
1267 if (copy_from_user(&freq, optval, sizeof(freq)))
1270 if (freq.flr_action != IPV6_FL_A_GET)
1274 flags = freq.flr_flags;
1276 memset(&freq, 0, sizeof(freq));
1278 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1282 if (put_user(len, optlen))
1284 if (copy_to_user(optval, &freq, len))
1290 case IPV6_ADDR_PREFERENCES:
1293 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1294 val |= IPV6_PREFER_SRC_TMP;
1295 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1296 val |= IPV6_PREFER_SRC_PUBLIC;
1298 /* XXX: should we return system default? */
1299 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1302 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1303 val |= IPV6_PREFER_SRC_COA;
1305 val |= IPV6_PREFER_SRC_HOME;
1308 case IPV6_MINHOPCOUNT:
1309 val = np->min_hopcount;
1316 case IPV6_AUTOFLOWLABEL:
1317 val = ip6_autoflowlabel(sock_net(sk), np);
1321 return -ENOPROTOOPT;
1323 len = min_t(unsigned int, sizeof(int), len);
1324 if (put_user(len, optlen))
1326 if (copy_to_user(optval, &val, len))
1331 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1332 char __user *optval, int __user *optlen)
1336 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1337 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1339 if (level != SOL_IPV6)
1340 return -ENOPROTOOPT;
1342 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1343 #ifdef CONFIG_NETFILTER
1344 /* we need to exclude all possible ENOPROTOOPTs except default case */
1345 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1348 if (get_user(len, optlen))
1351 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1353 err = put_user(len, optlen);
1358 EXPORT_SYMBOL(ipv6_getsockopt);
1360 #ifdef CONFIG_COMPAT
1361 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1362 char __user *optval, int __user *optlen)
1366 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1367 if (udp_prot.compat_getsockopt != NULL)
1368 return udp_prot.compat_getsockopt(sk, level, optname,
1370 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1373 if (level != SOL_IPV6)
1374 return -ENOPROTOOPT;
1376 if (optname == MCAST_MSFILTER)
1377 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1380 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1382 #ifdef CONFIG_NETFILTER
1383 /* we need to exclude all possible ENOPROTOOPTs except default case */
1384 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1387 if (get_user(len, optlen))
1390 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1392 err = put_user(len, optlen);
1397 EXPORT_SYMBOL(compat_ipv6_getsockopt);