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(&inet6_sk(sk)->opt, opt);
120 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
121 char __user *optval, unsigned int optlen)
123 struct ipv6_pinfo *np = inet6_sk(sk);
124 struct net *net = sock_net(sk);
126 int retv = -ENOPROTOOPT;
131 if (optlen >= sizeof(int)) {
132 if (get_user(val, (int __user *) optval))
138 valbool = (val != 0);
140 if (ip6_mroute_opt(optname))
141 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
148 if (optlen < sizeof(int))
150 if (val == PF_INET) {
151 struct ipv6_txoptions *opt;
152 struct sk_buff *pktopt;
154 if (sk->sk_type == SOCK_RAW)
157 if (sk->sk_protocol == IPPROTO_UDP ||
158 sk->sk_protocol == IPPROTO_UDPLITE) {
159 struct udp_sock *up = udp_sk(sk);
160 if (up->pending == AF_INET6) {
164 } else if (sk->sk_protocol != IPPROTO_TCP)
167 if (sk->sk_state != TCP_ESTABLISHED) {
172 if (ipv6_only_sock(sk) ||
173 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
174 retv = -EADDRNOTAVAIL;
178 fl6_free_socklist(sk);
179 ipv6_sock_mc_close(sk);
182 * Sock is moving from IPv6 to IPv4 (sk_prot), so
183 * remove it from the refcnt debug socks count in the
186 sk_refcnt_debug_dec(sk);
188 if (sk->sk_protocol == IPPROTO_TCP) {
189 struct inet_connection_sock *icsk = inet_csk(sk);
191 sock_prot_inuse_add(net, sk->sk_prot, -1);
192 sock_prot_inuse_add(net, &tcp_prot, 1);
194 sk->sk_prot = &tcp_prot;
195 icsk->icsk_af_ops = &ipv4_specific;
196 sk->sk_socket->ops = &inet_stream_ops;
197 sk->sk_family = PF_INET;
198 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
200 struct proto *prot = &udp_prot;
202 if (sk->sk_protocol == IPPROTO_UDPLITE)
203 prot = &udplite_prot;
205 sock_prot_inuse_add(net, sk->sk_prot, -1);
206 sock_prot_inuse_add(net, prot, 1);
209 sk->sk_socket->ops = &inet_dgram_ops;
210 sk->sk_family = PF_INET;
212 opt = xchg(&np->opt, NULL);
214 sock_kfree_s(sk, opt, opt->tot_len);
215 pktopt = xchg(&np->pktoptions, NULL);
218 sk->sk_destruct = inet_sock_destruct;
220 * ... and add it to the refcnt debug socks count
221 * in the new family. -acme
223 sk_refcnt_debug_inc(sk);
224 module_put(THIS_MODULE);
231 if (optlen < sizeof(int) ||
232 inet_sk(sk)->inet_num)
234 sk->sk_ipv6only = valbool;
238 case IPV6_RECVPKTINFO:
239 if (optlen < sizeof(int))
241 np->rxopt.bits.rxinfo = valbool;
245 case IPV6_2292PKTINFO:
246 if (optlen < sizeof(int))
248 np->rxopt.bits.rxoinfo = valbool;
252 case IPV6_RECVHOPLIMIT:
253 if (optlen < sizeof(int))
255 np->rxopt.bits.rxhlim = valbool;
259 case IPV6_2292HOPLIMIT:
260 if (optlen < sizeof(int))
262 np->rxopt.bits.rxohlim = valbool;
267 if (optlen < sizeof(int))
269 np->rxopt.bits.srcrt = valbool;
274 if (optlen < sizeof(int))
276 np->rxopt.bits.osrcrt = valbool;
280 case IPV6_RECVHOPOPTS:
281 if (optlen < sizeof(int))
283 np->rxopt.bits.hopopts = valbool;
287 case IPV6_2292HOPOPTS:
288 if (optlen < sizeof(int))
290 np->rxopt.bits.ohopopts = valbool;
294 case IPV6_RECVDSTOPTS:
295 if (optlen < sizeof(int))
297 np->rxopt.bits.dstopts = valbool;
301 case IPV6_2292DSTOPTS:
302 if (optlen < sizeof(int))
304 np->rxopt.bits.odstopts = valbool;
309 if (optlen < sizeof(int))
311 if (val < -1 || val > 0xff)
313 /* RFC 3542, 6.5: default traffic class of 0x0 */
320 case IPV6_RECVTCLASS:
321 if (optlen < sizeof(int))
323 np->rxopt.bits.rxtclass = valbool;
328 if (optlen < sizeof(int))
330 np->rxopt.bits.rxflow = valbool;
334 case IPV6_RECVPATHMTU:
335 if (optlen < sizeof(int))
337 np->rxopt.bits.rxpmtu = valbool;
341 case IPV6_TRANSPARENT:
342 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
343 !ns_capable(net->user_ns, CAP_NET_RAW)) {
347 if (optlen < sizeof(int))
349 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
350 inet_sk(sk)->transparent = valbool;
354 case IPV6_RECVORIGDSTADDR:
355 if (optlen < sizeof(int))
357 np->rxopt.bits.rxorigdstaddr = valbool;
362 case IPV6_RTHDRDSTOPTS:
366 struct ipv6_txoptions *opt;
368 /* remove any sticky options header with a zero option
369 * length, per RFC3542.
373 else if (optval == NULL)
375 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
376 optlen & 0x7 || optlen > 8 * 255)
379 /* hop-by-hop / destination options are privileged option */
381 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
384 opt = ipv6_renew_options(sk, np->opt, optname,
385 (struct ipv6_opt_hdr __user *)optval,
392 /* routing header option needs extra check */
394 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
395 struct ipv6_rt_hdr *rthdr = opt->srcrt;
396 switch (rthdr->type) {
397 #if IS_ENABLED(CONFIG_IPV6_MIP6)
398 case IPV6_SRCRT_TYPE_2:
399 if (rthdr->hdrlen != 2 ||
400 rthdr->segments_left != 1)
411 opt = ipv6_update_options(sk, opt);
414 sock_kfree_s(sk, opt, opt->tot_len);
420 struct in6_pktinfo pkt;
424 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
427 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
431 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
434 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
435 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
440 case IPV6_2292PKTOPTIONS:
442 struct ipv6_txoptions *opt = NULL;
447 memset(&fl6, 0, sizeof(fl6));
448 fl6.flowi6_oif = sk->sk_bound_dev_if;
449 fl6.flowi6_mark = sk->sk_mark;
454 /* 1K is probably excessive
455 * 1K is surely not enough, 2K per standard header is 16K.
458 if (optlen > 64*1024)
461 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
466 memset(opt, 0, sizeof(*opt));
467 opt->tot_len = sizeof(*opt) + optlen;
469 if (copy_from_user(opt+1, optval, optlen))
472 msg.msg_controllen = optlen;
473 msg.msg_control = (void *)(opt+1);
475 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
481 opt = ipv6_update_options(sk, opt);
484 sock_kfree_s(sk, opt, opt->tot_len);
487 case IPV6_UNICAST_HOPS:
488 if (optlen < sizeof(int))
490 if (val > 255 || val < -1)
496 case IPV6_MULTICAST_HOPS:
497 if (sk->sk_type == SOCK_STREAM)
499 if (optlen < sizeof(int))
501 if (val > 255 || val < -1)
503 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
507 case IPV6_MULTICAST_LOOP:
508 if (optlen < sizeof(int))
512 np->mc_loop = valbool;
516 case IPV6_UNICAST_IF:
518 struct net_device *dev = NULL;
521 if (optlen != sizeof(int))
524 ifindex = (__force int)ntohl((__force __be32)val);
531 dev = dev_get_by_index(net, ifindex);
532 retv = -EADDRNOTAVAIL;
538 if (sk->sk_bound_dev_if)
541 np->ucast_oif = ifindex;
546 case IPV6_MULTICAST_IF:
547 if (sk->sk_type == SOCK_STREAM)
549 if (optlen < sizeof(int))
553 struct net_device *dev;
555 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
558 dev = dev_get_by_index(net, val);
568 case IPV6_ADD_MEMBERSHIP:
569 case IPV6_DROP_MEMBERSHIP:
571 struct ipv6_mreq mreq;
573 if (optlen < sizeof(struct ipv6_mreq))
577 if (inet_sk(sk)->is_icsk)
581 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
584 if (optname == IPV6_ADD_MEMBERSHIP)
585 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
587 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
590 case IPV6_JOIN_ANYCAST:
591 case IPV6_LEAVE_ANYCAST:
593 struct ipv6_mreq mreq;
595 if (optlen < sizeof(struct ipv6_mreq))
599 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
602 if (optname == IPV6_JOIN_ANYCAST)
603 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
605 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
608 case MCAST_JOIN_GROUP:
609 case MCAST_LEAVE_GROUP:
611 struct group_req greq;
612 struct sockaddr_in6 *psin6;
614 if (optlen < sizeof(struct group_req))
618 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
620 if (greq.gr_group.ss_family != AF_INET6) {
621 retv = -EADDRNOTAVAIL;
624 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
625 if (optname == MCAST_JOIN_GROUP)
626 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
629 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
633 case MCAST_JOIN_SOURCE_GROUP:
634 case MCAST_LEAVE_SOURCE_GROUP:
635 case MCAST_BLOCK_SOURCE:
636 case MCAST_UNBLOCK_SOURCE:
638 struct group_source_req greqs;
641 if (optlen < sizeof(struct group_source_req))
643 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
647 if (greqs.gsr_group.ss_family != AF_INET6 ||
648 greqs.gsr_source.ss_family != AF_INET6) {
649 retv = -EADDRNOTAVAIL;
652 if (optname == MCAST_BLOCK_SOURCE) {
653 omode = MCAST_EXCLUDE;
655 } else if (optname == MCAST_UNBLOCK_SOURCE) {
656 omode = MCAST_EXCLUDE;
658 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
659 struct sockaddr_in6 *psin6;
661 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
662 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
664 /* prior join w/ different source is ok */
665 if (retv && retv != -EADDRINUSE)
667 omode = MCAST_INCLUDE;
669 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
670 omode = MCAST_INCLUDE;
673 retv = ip6_mc_source(add, omode, sk, &greqs);
678 struct group_filter *gsf;
680 if (optlen < GROUP_FILTER_SIZE(0))
682 if (optlen > sysctl_optmem_max) {
686 gsf = kmalloc(optlen, GFP_KERNEL);
692 if (copy_from_user(gsf, optval, optlen)) {
696 /* numsrc >= (4G-140)/128 overflow in 32 bits */
697 if (gsf->gf_numsrc >= 0x1ffffffU ||
698 gsf->gf_numsrc > sysctl_mld_max_msf) {
703 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
708 retv = ip6_mc_msfilter(sk, gsf);
713 case IPV6_ROUTER_ALERT:
714 if (optlen < sizeof(int))
716 retv = ip6_ra_control(sk, val);
718 case IPV6_MTU_DISCOVER:
719 if (optlen < sizeof(int))
721 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
727 if (optlen < sizeof(int))
729 if (val && val < IPV6_MIN_MTU)
735 if (optlen < sizeof(int))
737 np->recverr = valbool;
739 skb_queue_purge(&sk->sk_error_queue);
742 case IPV6_FLOWINFO_SEND:
743 if (optlen < sizeof(int))
745 np->sndflow = valbool;
748 case IPV6_FLOWLABEL_MGR:
749 retv = ipv6_flowlabel_opt(sk, optval, optlen);
751 case IPV6_IPSEC_POLICY:
752 case IPV6_XFRM_POLICY:
754 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
756 retv = xfrm_user_policy(sk, optname, optval, optlen);
759 case IPV6_ADDR_PREFERENCES:
761 unsigned int pref = 0;
762 unsigned int prefmask = ~0;
764 if (optlen < sizeof(int))
769 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
770 switch (val & (IPV6_PREFER_SRC_PUBLIC|
772 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
773 case IPV6_PREFER_SRC_PUBLIC:
774 pref |= IPV6_PREFER_SRC_PUBLIC;
776 case IPV6_PREFER_SRC_TMP:
777 pref |= IPV6_PREFER_SRC_TMP;
779 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
782 goto pref_skip_pubtmp;
787 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
788 IPV6_PREFER_SRC_TMP);
791 /* check HOME/COA conflicts */
792 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
793 case IPV6_PREFER_SRC_HOME:
795 case IPV6_PREFER_SRC_COA:
796 pref |= IPV6_PREFER_SRC_COA;
803 prefmask &= ~IPV6_PREFER_SRC_COA;
806 /* check CGA/NONCGA conflicts */
807 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
808 case IPV6_PREFER_SRC_CGA:
809 case IPV6_PREFER_SRC_NONCGA:
816 np->srcprefs = (np->srcprefs & prefmask) | pref;
821 case IPV6_MINHOPCOUNT:
822 if (optlen < sizeof(int))
824 if (val < 0 || val > 255)
826 np->min_hopcount = val;
830 np->dontfrag = valbool;
833 case IPV6_AUTOFLOWLABEL:
834 np->autoflowlabel = valbool;
848 int ipv6_setsockopt(struct sock *sk, int level, int optname,
849 char __user *optval, unsigned int optlen)
853 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
854 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
856 if (level != SOL_IPV6)
859 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
860 #ifdef CONFIG_NETFILTER
861 /* we need to exclude all possible ENOPROTOOPTs except default case */
862 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
863 optname != IPV6_XFRM_POLICY) {
865 err = nf_setsockopt(sk, PF_INET6, optname, optval,
872 EXPORT_SYMBOL(ipv6_setsockopt);
875 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
876 char __user *optval, unsigned int optlen)
880 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
881 if (udp_prot.compat_setsockopt != NULL)
882 return udp_prot.compat_setsockopt(sk, level, optname,
884 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
887 if (level != SOL_IPV6)
890 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
891 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
894 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
895 #ifdef CONFIG_NETFILTER
896 /* we need to exclude all possible ENOPROTOOPTs except default case */
897 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
898 optname != IPV6_XFRM_POLICY) {
900 err = compat_nf_setsockopt(sk, PF_INET6, optname,
907 EXPORT_SYMBOL(compat_ipv6_setsockopt);
910 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
911 int optname, char __user *optval, int len)
913 struct ipv6_opt_hdr *hdr;
922 case IPV6_RTHDRDSTOPTS:
926 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
932 return -EINVAL; /* should not happen */
938 len = min_t(unsigned int, len, ipv6_optlen(hdr));
939 if (copy_to_user(optval, hdr, len))
944 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
945 char __user *optval, int __user *optlen, unsigned int flags)
947 struct ipv6_pinfo *np = inet6_sk(sk);
951 if (ip6_mroute_opt(optname))
952 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
954 if (get_user(len, optlen))
958 if (sk->sk_protocol != IPPROTO_UDP &&
959 sk->sk_protocol != IPPROTO_UDPLITE &&
960 sk->sk_protocol != IPPROTO_TCP)
962 if (sk->sk_state != TCP_ESTABLISHED)
968 struct group_filter gsf;
971 if (len < GROUP_FILTER_SIZE(0))
973 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
975 if (gsf.gf_group.ss_family != AF_INET6)
976 return -EADDRNOTAVAIL;
978 err = ip6_mc_msfget(sk, &gsf,
979 (struct group_filter __user *)optval, optlen);
984 case IPV6_2292PKTOPTIONS:
989 if (sk->sk_type != SOCK_STREAM)
992 msg.msg_control = optval;
993 msg.msg_controllen = len;
994 msg.msg_flags = flags;
997 skb = np->pktoptions;
999 ip6_datagram_recv_ctl(sk, &msg, skb);
1002 if (np->rxopt.bits.rxinfo) {
1003 struct in6_pktinfo src_info;
1004 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1005 np->sticky_pktinfo.ipi6_ifindex;
1006 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1007 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1009 if (np->rxopt.bits.rxhlim) {
1010 int hlim = np->mcast_hops;
1011 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1013 if (np->rxopt.bits.rxtclass) {
1014 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1016 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1018 if (np->rxopt.bits.rxoinfo) {
1019 struct in6_pktinfo src_info;
1020 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1021 np->sticky_pktinfo.ipi6_ifindex;
1022 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1023 np->sticky_pktinfo.ipi6_addr;
1024 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1026 if (np->rxopt.bits.rxohlim) {
1027 int hlim = np->mcast_hops;
1028 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1030 if (np->rxopt.bits.rxflow) {
1031 __be32 flowinfo = np->rcv_flowinfo;
1033 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1036 len -= msg.msg_controllen;
1037 return put_user(len, optlen);
1041 struct dst_entry *dst;
1045 dst = __sk_dst_get(sk);
1055 val = sk->sk_ipv6only;
1058 case IPV6_RECVPKTINFO:
1059 val = np->rxopt.bits.rxinfo;
1062 case IPV6_2292PKTINFO:
1063 val = np->rxopt.bits.rxoinfo;
1066 case IPV6_RECVHOPLIMIT:
1067 val = np->rxopt.bits.rxhlim;
1070 case IPV6_2292HOPLIMIT:
1071 val = np->rxopt.bits.rxohlim;
1074 case IPV6_RECVRTHDR:
1075 val = np->rxopt.bits.srcrt;
1078 case IPV6_2292RTHDR:
1079 val = np->rxopt.bits.osrcrt;
1083 case IPV6_RTHDRDSTOPTS:
1089 len = ipv6_getsockopt_sticky(sk, np->opt,
1090 optname, optval, len);
1092 /* check if ipv6_getsockopt_sticky() returns err code */
1095 return put_user(len, optlen);
1098 case IPV6_RECVHOPOPTS:
1099 val = np->rxopt.bits.hopopts;
1102 case IPV6_2292HOPOPTS:
1103 val = np->rxopt.bits.ohopopts;
1106 case IPV6_RECVDSTOPTS:
1107 val = np->rxopt.bits.dstopts;
1110 case IPV6_2292DSTOPTS:
1111 val = np->rxopt.bits.odstopts;
1118 case IPV6_RECVTCLASS:
1119 val = np->rxopt.bits.rxtclass;
1123 val = np->rxopt.bits.rxflow;
1126 case IPV6_RECVPATHMTU:
1127 val = np->rxopt.bits.rxpmtu;
1132 struct dst_entry *dst;
1133 struct ip6_mtuinfo mtuinfo;
1135 if (len < sizeof(mtuinfo))
1138 len = sizeof(mtuinfo);
1139 memset(&mtuinfo, 0, sizeof(mtuinfo));
1142 dst = __sk_dst_get(sk);
1144 mtuinfo.ip6m_mtu = dst_mtu(dst);
1146 if (!mtuinfo.ip6m_mtu)
1149 if (put_user(len, optlen))
1151 if (copy_to_user(optval, &mtuinfo, len))
1157 case IPV6_TRANSPARENT:
1158 val = inet_sk(sk)->transparent;
1161 case IPV6_RECVORIGDSTADDR:
1162 val = np->rxopt.bits.rxorigdstaddr;
1165 case IPV6_UNICAST_HOPS:
1166 case IPV6_MULTICAST_HOPS:
1168 struct dst_entry *dst;
1170 if (optname == IPV6_UNICAST_HOPS)
1171 val = np->hop_limit;
1173 val = np->mcast_hops;
1177 dst = __sk_dst_get(sk);
1179 val = ip6_dst_hoplimit(dst);
1184 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1188 case IPV6_MULTICAST_LOOP:
1192 case IPV6_MULTICAST_IF:
1193 val = np->mcast_oif;
1196 case IPV6_UNICAST_IF:
1197 val = (__force int)htonl((__u32) np->ucast_oif);
1200 case IPV6_MTU_DISCOVER:
1208 case IPV6_FLOWINFO_SEND:
1212 case IPV6_FLOWLABEL_MGR:
1214 struct in6_flowlabel_req freq;
1217 if (len < sizeof(freq))
1220 if (copy_from_user(&freq, optval, sizeof(freq)))
1223 if (freq.flr_action != IPV6_FL_A_GET)
1227 flags = freq.flr_flags;
1229 memset(&freq, 0, sizeof(freq));
1231 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1235 if (put_user(len, optlen))
1237 if (copy_to_user(optval, &freq, len))
1243 case IPV6_ADDR_PREFERENCES:
1246 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1247 val |= IPV6_PREFER_SRC_TMP;
1248 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1249 val |= IPV6_PREFER_SRC_PUBLIC;
1251 /* XXX: should we return system default? */
1252 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1255 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1256 val |= IPV6_PREFER_SRC_COA;
1258 val |= IPV6_PREFER_SRC_HOME;
1261 case IPV6_MINHOPCOUNT:
1262 val = np->min_hopcount;
1269 case IPV6_AUTOFLOWLABEL:
1270 val = np->autoflowlabel;
1274 return -ENOPROTOOPT;
1276 len = min_t(unsigned int, sizeof(int), len);
1277 if (put_user(len, optlen))
1279 if (copy_to_user(optval, &val, len))
1284 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1285 char __user *optval, int __user *optlen)
1289 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1290 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1292 if (level != SOL_IPV6)
1293 return -ENOPROTOOPT;
1295 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1296 #ifdef CONFIG_NETFILTER
1297 /* we need to exclude all possible ENOPROTOOPTs except default case */
1298 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1301 if (get_user(len, optlen))
1305 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1309 err = put_user(len, optlen);
1314 EXPORT_SYMBOL(ipv6_getsockopt);
1316 #ifdef CONFIG_COMPAT
1317 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1318 char __user *optval, int __user *optlen)
1322 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1323 if (udp_prot.compat_getsockopt != NULL)
1324 return udp_prot.compat_getsockopt(sk, level, optname,
1326 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1329 if (level != SOL_IPV6)
1330 return -ENOPROTOOPT;
1332 if (optname == MCAST_MSFILTER)
1333 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1336 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1338 #ifdef CONFIG_NETFILTER
1339 /* we need to exclude all possible ENOPROTOOPTs except default case */
1340 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1343 if (get_user(len, optlen))
1347 err = compat_nf_getsockopt(sk, PF_INET6,
1348 optname, optval, &len);
1351 err = put_user(len, optlen);
1356 EXPORT_SYMBOL(compat_ipv6_getsockopt);