1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
9 * Based on linux/net/ipv4/ip_sockglue.c
11 * FIXME: Make the setsockopt code POSIX compliant: That is
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
48 #include <net/udplite.h>
50 #include <net/compat.h>
53 #include <linux/uaccess.h>
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
58 int ip6_ra_control(struct sock *sk, int sel)
60 struct ip6_ra_chain *ra, *new_ra, **rap;
62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67 if (sel >= 0 && !new_ra)
70 write_lock_bh(&ip6_ra_lock);
71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 write_unlock_bh(&ip6_ra_lock);
80 write_unlock_bh(&ip6_ra_lock);
88 write_unlock_bh(&ip6_ra_lock);
96 write_unlock_bh(&ip6_ra_lock);
100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101 struct ipv6_txoptions *opt)
103 if (inet_sk(sk)->is_icsk) {
105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107 struct inet_connection_sock *icsk = inet_csk(sk);
108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
119 static bool setsockopt_needs_rtnl(int optname)
123 case IPV6_ADD_MEMBERSHIP:
124 case IPV6_DROP_MEMBERSHIP:
125 case IPV6_JOIN_ANYCAST:
126 case IPV6_LEAVE_ANYCAST:
127 case MCAST_JOIN_GROUP:
128 case MCAST_LEAVE_GROUP:
129 case MCAST_JOIN_SOURCE_GROUP:
130 case MCAST_LEAVE_SOURCE_GROUP:
131 case MCAST_BLOCK_SOURCE:
132 case MCAST_UNBLOCK_SOURCE:
139 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
140 struct group_source_req *greqs)
144 if (greqs->gsr_group.ss_family != AF_INET6 ||
145 greqs->gsr_source.ss_family != AF_INET6)
146 return -EADDRNOTAVAIL;
148 if (optname == MCAST_BLOCK_SOURCE) {
149 omode = MCAST_EXCLUDE;
151 } else if (optname == MCAST_UNBLOCK_SOURCE) {
152 omode = MCAST_EXCLUDE;
154 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
155 struct sockaddr_in6 *psin6;
158 psin6 = (struct sockaddr_in6 *)&greqs->gsr_group;
159 retv = ipv6_sock_mc_join_ssm(sk, greqs->gsr_interface,
162 /* prior join w/ different source is ok */
163 if (retv && retv != -EADDRINUSE)
165 omode = MCAST_INCLUDE;
167 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
168 omode = MCAST_INCLUDE;
171 return ip6_mc_source(add, omode, sk, greqs);
174 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
175 char __user *optval, unsigned int optlen)
177 struct ipv6_pinfo *np = inet6_sk(sk);
178 struct net *net = sock_net(sk);
180 int retv = -ENOPROTOOPT;
181 bool needs_rtnl = setsockopt_needs_rtnl(optname);
186 if (optlen >= sizeof(int)) {
187 if (get_user(val, (int __user *) optval))
193 valbool = (val != 0);
195 if (ip6_mroute_opt(optname))
196 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
205 if (optlen < sizeof(int))
207 if (val == PF_INET) {
208 struct ipv6_txoptions *opt;
209 struct sk_buff *pktopt;
211 if (sk->sk_type == SOCK_RAW)
214 if (sk->sk_protocol == IPPROTO_UDP ||
215 sk->sk_protocol == IPPROTO_UDPLITE) {
216 struct udp_sock *up = udp_sk(sk);
217 if (up->pending == AF_INET6) {
221 } else if (sk->sk_protocol == IPPROTO_TCP) {
222 if (sk->sk_prot != &tcpv6_prot) {
230 if (sk->sk_state != TCP_ESTABLISHED) {
235 if (ipv6_only_sock(sk) ||
236 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
237 retv = -EADDRNOTAVAIL;
241 fl6_free_socklist(sk);
242 __ipv6_sock_mc_close(sk);
245 * Sock is moving from IPv6 to IPv4 (sk_prot), so
246 * remove it from the refcnt debug socks count in the
249 sk_refcnt_debug_dec(sk);
251 if (sk->sk_protocol == IPPROTO_TCP) {
252 struct inet_connection_sock *icsk = inet_csk(sk);
254 sock_prot_inuse_add(net, sk->sk_prot, -1);
255 sock_prot_inuse_add(net, &tcp_prot, 1);
257 sk->sk_prot = &tcp_prot;
258 icsk->icsk_af_ops = &ipv4_specific;
259 sk->sk_socket->ops = &inet_stream_ops;
260 sk->sk_family = PF_INET;
261 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
263 struct proto *prot = &udp_prot;
265 if (sk->sk_protocol == IPPROTO_UDPLITE)
266 prot = &udplite_prot;
268 sock_prot_inuse_add(net, sk->sk_prot, -1);
269 sock_prot_inuse_add(net, prot, 1);
272 sk->sk_socket->ops = &inet_dgram_ops;
273 sk->sk_family = PF_INET;
275 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
278 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
281 pktopt = xchg(&np->pktoptions, NULL);
285 * ... and add it to the refcnt debug socks count
286 * in the new family. -acme
288 sk_refcnt_debug_inc(sk);
289 module_put(THIS_MODULE);
296 if (optlen < sizeof(int) ||
297 inet_sk(sk)->inet_num)
299 sk->sk_ipv6only = valbool;
303 case IPV6_RECVPKTINFO:
304 if (optlen < sizeof(int))
306 np->rxopt.bits.rxinfo = valbool;
310 case IPV6_2292PKTINFO:
311 if (optlen < sizeof(int))
313 np->rxopt.bits.rxoinfo = valbool;
317 case IPV6_RECVHOPLIMIT:
318 if (optlen < sizeof(int))
320 np->rxopt.bits.rxhlim = valbool;
324 case IPV6_2292HOPLIMIT:
325 if (optlen < sizeof(int))
327 np->rxopt.bits.rxohlim = valbool;
332 if (optlen < sizeof(int))
334 np->rxopt.bits.srcrt = valbool;
339 if (optlen < sizeof(int))
341 np->rxopt.bits.osrcrt = valbool;
345 case IPV6_RECVHOPOPTS:
346 if (optlen < sizeof(int))
348 np->rxopt.bits.hopopts = valbool;
352 case IPV6_2292HOPOPTS:
353 if (optlen < sizeof(int))
355 np->rxopt.bits.ohopopts = valbool;
359 case IPV6_RECVDSTOPTS:
360 if (optlen < sizeof(int))
362 np->rxopt.bits.dstopts = valbool;
366 case IPV6_2292DSTOPTS:
367 if (optlen < sizeof(int))
369 np->rxopt.bits.odstopts = valbool;
374 if (optlen < sizeof(int))
376 if (val < -1 || val > 0xff)
378 /* RFC 3542, 6.5: default traffic class of 0x0 */
385 case IPV6_RECVTCLASS:
386 if (optlen < sizeof(int))
388 np->rxopt.bits.rxtclass = valbool;
393 if (optlen < sizeof(int))
395 np->rxopt.bits.rxflow = valbool;
399 case IPV6_RECVPATHMTU:
400 if (optlen < sizeof(int))
402 np->rxopt.bits.rxpmtu = valbool;
406 case IPV6_TRANSPARENT:
407 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
408 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
412 if (optlen < sizeof(int))
414 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
415 inet_sk(sk)->transparent = valbool;
420 if (optlen < sizeof(int))
422 /* we also don't have a separate freebind bit for IPV6 */
423 inet_sk(sk)->freebind = valbool;
427 case IPV6_RECVORIGDSTADDR:
428 if (optlen < sizeof(int))
430 np->rxopt.bits.rxorigdstaddr = valbool;
435 case IPV6_RTHDRDSTOPTS:
439 struct ipv6_txoptions *opt;
440 struct ipv6_opt_hdr *new = NULL;
442 /* hop-by-hop / destination options are privileged option */
444 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
447 /* remove any sticky options header with a zero option
448 * length, per RFC3542.
454 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
455 optlen & 0x7 || optlen > 8 * 255)
458 new = memdup_user(optval, optlen);
463 if (unlikely(ipv6_optlen(new) > optlen)) {
469 opt = rcu_dereference_protected(np->opt,
470 lockdep_sock_is_held(sk));
471 opt = ipv6_renew_options(sk, opt, optname, new);
478 /* routing header option needs extra check */
480 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
481 struct ipv6_rt_hdr *rthdr = opt->srcrt;
482 switch (rthdr->type) {
483 #if IS_ENABLED(CONFIG_IPV6_MIP6)
484 case IPV6_SRCRT_TYPE_2:
485 if (rthdr->hdrlen != 2 ||
486 rthdr->segments_left != 1)
491 case IPV6_SRCRT_TYPE_4:
493 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
496 if (!seg6_validate_srh(srh, optlen, false))
506 opt = ipv6_update_options(sk, opt);
509 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
517 struct in6_pktinfo pkt;
521 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
524 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
528 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
531 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
532 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
537 case IPV6_2292PKTOPTIONS:
539 struct ipv6_txoptions *opt = NULL;
542 struct ipcm6_cookie ipc6;
544 memset(&fl6, 0, sizeof(fl6));
545 fl6.flowi6_oif = sk->sk_bound_dev_if;
546 fl6.flowi6_mark = sk->sk_mark;
551 /* 1K is probably excessive
552 * 1K is surely not enough, 2K per standard header is 16K.
555 if (optlen > 64*1024)
558 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
563 memset(opt, 0, sizeof(*opt));
564 refcount_set(&opt->refcnt, 1);
565 opt->tot_len = sizeof(*opt) + optlen;
567 if (copy_from_user(opt+1, optval, optlen))
570 msg.msg_controllen = optlen;
571 msg.msg_control = (void *)(opt+1);
574 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
579 opt = ipv6_update_options(sk, opt);
582 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
587 case IPV6_UNICAST_HOPS:
588 if (optlen < sizeof(int))
590 if (val > 255 || val < -1)
596 case IPV6_MULTICAST_HOPS:
597 if (sk->sk_type == SOCK_STREAM)
599 if (optlen < sizeof(int))
601 if (val > 255 || val < -1)
603 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
607 case IPV6_MULTICAST_LOOP:
608 if (optlen < sizeof(int))
612 np->mc_loop = valbool;
616 case IPV6_UNICAST_IF:
618 struct net_device *dev = NULL;
621 if (optlen != sizeof(int))
624 ifindex = (__force int)ntohl((__force __be32)val);
631 dev = dev_get_by_index(net, ifindex);
632 retv = -EADDRNOTAVAIL;
638 if (sk->sk_bound_dev_if)
641 np->ucast_oif = ifindex;
646 case IPV6_MULTICAST_IF:
647 if (sk->sk_type == SOCK_STREAM)
649 if (optlen < sizeof(int))
653 struct net_device *dev;
658 dev = dev_get_by_index_rcu(net, val);
664 midx = l3mdev_master_ifindex_rcu(dev);
668 if (sk->sk_bound_dev_if &&
669 sk->sk_bound_dev_if != val &&
670 (!midx || midx != sk->sk_bound_dev_if))
676 case IPV6_ADD_MEMBERSHIP:
677 case IPV6_DROP_MEMBERSHIP:
679 struct ipv6_mreq mreq;
681 if (optlen < sizeof(struct ipv6_mreq))
685 if (inet_sk(sk)->is_icsk)
689 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
692 if (optname == IPV6_ADD_MEMBERSHIP)
693 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
695 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
698 case IPV6_JOIN_ANYCAST:
699 case IPV6_LEAVE_ANYCAST:
701 struct ipv6_mreq mreq;
703 if (optlen < sizeof(struct ipv6_mreq))
707 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
710 if (optname == IPV6_JOIN_ANYCAST)
711 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
713 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
716 case IPV6_MULTICAST_ALL:
717 if (optlen < sizeof(int))
719 np->mc_all = valbool;
723 case MCAST_JOIN_GROUP:
724 case MCAST_LEAVE_GROUP:
726 struct group_req greq;
727 struct sockaddr_in6 *psin6;
729 if (optlen < sizeof(struct group_req))
733 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
735 if (greq.gr_group.ss_family != AF_INET6) {
736 retv = -EADDRNOTAVAIL;
739 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
740 if (optname == MCAST_JOIN_GROUP)
741 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
744 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
748 case MCAST_JOIN_SOURCE_GROUP:
749 case MCAST_LEAVE_SOURCE_GROUP:
750 case MCAST_BLOCK_SOURCE:
751 case MCAST_UNBLOCK_SOURCE:
753 struct group_source_req greqs;
755 if (optlen < sizeof(struct group_source_req))
757 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
761 retv = do_ipv6_mcast_group_source(sk, optname, &greqs);
766 struct group_filter *gsf;
768 if (optlen < GROUP_FILTER_SIZE(0))
770 if (optlen > sysctl_optmem_max) {
774 gsf = memdup_user(optval, optlen);
779 /* numsrc >= (4G-140)/128 overflow in 32 bits */
780 if (gsf->gf_numsrc >= 0x1ffffffU ||
781 gsf->gf_numsrc > sysctl_mld_max_msf) {
786 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
791 retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
796 case IPV6_ROUTER_ALERT:
797 if (optlen < sizeof(int))
799 retv = ip6_ra_control(sk, val);
801 case IPV6_ROUTER_ALERT_ISOLATE:
802 if (optlen < sizeof(int))
804 np->rtalert_isolate = valbool;
807 case IPV6_MTU_DISCOVER:
808 if (optlen < sizeof(int))
810 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
816 if (optlen < sizeof(int))
818 if (val && val < IPV6_MIN_MTU)
824 if (optlen < sizeof(int))
826 np->recverr = valbool;
828 skb_queue_purge(&sk->sk_error_queue);
831 case IPV6_FLOWINFO_SEND:
832 if (optlen < sizeof(int))
834 np->sndflow = valbool;
837 case IPV6_FLOWLABEL_MGR:
838 retv = ipv6_flowlabel_opt(sk, optval, optlen);
840 case IPV6_IPSEC_POLICY:
841 case IPV6_XFRM_POLICY:
843 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
845 retv = xfrm_user_policy(sk, optname, optval, optlen);
848 case IPV6_ADDR_PREFERENCES:
849 if (optlen < sizeof(int))
851 retv = __ip6_sock_set_addr_preferences(sk, val);
853 case IPV6_MINHOPCOUNT:
854 if (optlen < sizeof(int))
856 if (val < 0 || val > 255)
858 np->min_hopcount = val;
862 np->dontfrag = valbool;
865 case IPV6_AUTOFLOWLABEL:
866 np->autoflowlabel = valbool;
867 np->autoflowlabel_set = 1;
870 case IPV6_RECVFRAGSIZE:
871 np->rxopt.bits.recvfragsize = valbool;
889 int ipv6_setsockopt(struct sock *sk, int level, int optname,
890 char __user *optval, unsigned int optlen)
894 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
895 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
897 if (level != SOL_IPV6)
900 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
901 #ifdef CONFIG_NETFILTER
902 /* we need to exclude all possible ENOPROTOOPTs except default case */
903 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
904 optname != IPV6_XFRM_POLICY)
905 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
909 EXPORT_SYMBOL(ipv6_setsockopt);
912 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
913 char __user *optval, unsigned int optlen)
917 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
918 if (udp_prot.compat_setsockopt != NULL)
919 return udp_prot.compat_setsockopt(sk, level, optname,
921 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
924 if (level != SOL_IPV6)
928 case MCAST_JOIN_GROUP:
929 case MCAST_LEAVE_GROUP:
931 struct compat_group_req __user *gr32 = (void __user *)optval;
932 struct group_req greq;
933 struct sockaddr_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group;
935 if (optlen < sizeof(struct compat_group_req))
938 if (get_user(greq.gr_interface, &gr32->gr_interface) ||
939 copy_from_user(&greq.gr_group, &gr32->gr_group,
940 sizeof(greq.gr_group)))
943 if (greq.gr_group.ss_family != AF_INET6)
944 return -EADDRNOTAVAIL;
948 if (optname == MCAST_JOIN_GROUP)
949 err = ipv6_sock_mc_join(sk, greq.gr_interface,
952 err = ipv6_sock_mc_drop(sk, greq.gr_interface,
958 case MCAST_JOIN_SOURCE_GROUP:
959 case MCAST_LEAVE_SOURCE_GROUP:
960 case MCAST_BLOCK_SOURCE:
961 case MCAST_UNBLOCK_SOURCE:
963 struct compat_group_source_req __user *gsr32 = (void __user *)optval;
964 struct group_source_req greqs;
966 if (optlen < sizeof(struct compat_group_source_req))
969 if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) ||
970 copy_from_user(&greqs.gsr_group, &gsr32->gsr_group,
971 sizeof(greqs.gsr_group)) ||
972 copy_from_user(&greqs.gsr_source, &gsr32->gsr_source,
973 sizeof(greqs.gsr_source)))
978 err = do_ipv6_mcast_group_source(sk, optname, &greqs);
985 const int size0 = offsetof(struct compat_group_filter, gf_slist);
986 struct compat_group_filter *gf32;
992 if (optlen > sysctl_optmem_max - 4)
995 p = kmalloc(optlen + 4, GFP_KERNEL);
999 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
1000 if (copy_from_user(gf32, optval, optlen)) {
1005 n = gf32->gf_numsrc;
1006 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1007 if (n >= 0x1ffffffU ||
1008 n > sysctl_mld_max_msf) {
1012 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) {
1019 err = ip6_mc_msfilter(sk, &(struct group_filter){
1020 .gf_interface = gf32->gf_interface,
1021 .gf_group = gf32->gf_group,
1022 .gf_fmode = gf32->gf_fmode,
1023 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
1032 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1033 #ifdef CONFIG_NETFILTER
1034 /* we need to exclude all possible ENOPROTOOPTs except default case */
1035 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1036 optname != IPV6_XFRM_POLICY)
1037 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
1042 EXPORT_SYMBOL(compat_ipv6_setsockopt);
1045 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1046 int optname, char __user *optval, int len)
1048 struct ipv6_opt_hdr *hdr;
1057 case IPV6_RTHDRDSTOPTS:
1061 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1067 return -EINVAL; /* should not happen */
1073 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1074 if (copy_to_user(optval, hdr, len))
1079 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1080 char __user *optval, int __user *optlen, unsigned int flags)
1082 struct ipv6_pinfo *np = inet6_sk(sk);
1086 if (ip6_mroute_opt(optname))
1087 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1089 if (get_user(len, optlen))
1093 if (sk->sk_protocol != IPPROTO_UDP &&
1094 sk->sk_protocol != IPPROTO_UDPLITE &&
1095 sk->sk_protocol != IPPROTO_TCP)
1096 return -ENOPROTOOPT;
1097 if (sk->sk_state != TCP_ESTABLISHED)
1099 val = sk->sk_family;
1101 case MCAST_MSFILTER:
1103 struct group_filter __user *p = (void __user *)optval;
1104 struct group_filter gsf;
1105 const int size0 = offsetof(struct group_filter, gf_slist);
1111 if (copy_from_user(&gsf, p, size0))
1113 if (gsf.gf_group.ss_family != AF_INET6)
1114 return -EADDRNOTAVAIL;
1115 num = gsf.gf_numsrc;
1117 err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
1119 if (num > gsf.gf_numsrc)
1120 num = gsf.gf_numsrc;
1121 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1122 copy_to_user(p, &gsf, size0))
1129 case IPV6_2292PKTOPTIONS:
1132 struct sk_buff *skb;
1134 if (sk->sk_type != SOCK_STREAM)
1135 return -ENOPROTOOPT;
1137 msg.msg_control = optval;
1138 msg.msg_controllen = len;
1139 msg.msg_flags = flags;
1140 msg.msg_control_is_user = true;
1143 skb = np->pktoptions;
1145 ip6_datagram_recv_ctl(sk, &msg, skb);
1148 if (np->rxopt.bits.rxinfo) {
1149 struct in6_pktinfo src_info;
1150 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1151 np->sticky_pktinfo.ipi6_ifindex;
1152 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1153 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1155 if (np->rxopt.bits.rxhlim) {
1156 int hlim = np->mcast_hops;
1157 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1159 if (np->rxopt.bits.rxtclass) {
1160 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1162 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1164 if (np->rxopt.bits.rxoinfo) {
1165 struct in6_pktinfo src_info;
1166 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1167 np->sticky_pktinfo.ipi6_ifindex;
1168 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1169 np->sticky_pktinfo.ipi6_addr;
1170 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1172 if (np->rxopt.bits.rxohlim) {
1173 int hlim = np->mcast_hops;
1174 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1176 if (np->rxopt.bits.rxflow) {
1177 __be32 flowinfo = np->rcv_flowinfo;
1179 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1182 len -= msg.msg_controllen;
1183 return put_user(len, optlen);
1187 struct dst_entry *dst;
1191 dst = __sk_dst_get(sk);
1201 val = sk->sk_ipv6only;
1204 case IPV6_RECVPKTINFO:
1205 val = np->rxopt.bits.rxinfo;
1208 case IPV6_2292PKTINFO:
1209 val = np->rxopt.bits.rxoinfo;
1212 case IPV6_RECVHOPLIMIT:
1213 val = np->rxopt.bits.rxhlim;
1216 case IPV6_2292HOPLIMIT:
1217 val = np->rxopt.bits.rxohlim;
1220 case IPV6_RECVRTHDR:
1221 val = np->rxopt.bits.srcrt;
1224 case IPV6_2292RTHDR:
1225 val = np->rxopt.bits.osrcrt;
1229 case IPV6_RTHDRDSTOPTS:
1233 struct ipv6_txoptions *opt;
1236 opt = rcu_dereference_protected(np->opt,
1237 lockdep_sock_is_held(sk));
1238 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1240 /* check if ipv6_getsockopt_sticky() returns err code */
1243 return put_user(len, optlen);
1246 case IPV6_RECVHOPOPTS:
1247 val = np->rxopt.bits.hopopts;
1250 case IPV6_2292HOPOPTS:
1251 val = np->rxopt.bits.ohopopts;
1254 case IPV6_RECVDSTOPTS:
1255 val = np->rxopt.bits.dstopts;
1258 case IPV6_2292DSTOPTS:
1259 val = np->rxopt.bits.odstopts;
1266 case IPV6_RECVTCLASS:
1267 val = np->rxopt.bits.rxtclass;
1271 val = np->rxopt.bits.rxflow;
1274 case IPV6_RECVPATHMTU:
1275 val = np->rxopt.bits.rxpmtu;
1280 struct dst_entry *dst;
1281 struct ip6_mtuinfo mtuinfo;
1283 if (len < sizeof(mtuinfo))
1286 len = sizeof(mtuinfo);
1287 memset(&mtuinfo, 0, sizeof(mtuinfo));
1290 dst = __sk_dst_get(sk);
1292 mtuinfo.ip6m_mtu = dst_mtu(dst);
1294 if (!mtuinfo.ip6m_mtu)
1297 if (put_user(len, optlen))
1299 if (copy_to_user(optval, &mtuinfo, len))
1305 case IPV6_TRANSPARENT:
1306 val = inet_sk(sk)->transparent;
1310 val = inet_sk(sk)->freebind;
1313 case IPV6_RECVORIGDSTADDR:
1314 val = np->rxopt.bits.rxorigdstaddr;
1317 case IPV6_UNICAST_HOPS:
1318 case IPV6_MULTICAST_HOPS:
1320 struct dst_entry *dst;
1322 if (optname == IPV6_UNICAST_HOPS)
1323 val = np->hop_limit;
1325 val = np->mcast_hops;
1329 dst = __sk_dst_get(sk);
1331 val = ip6_dst_hoplimit(dst);
1336 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1340 case IPV6_MULTICAST_LOOP:
1344 case IPV6_MULTICAST_IF:
1345 val = np->mcast_oif;
1348 case IPV6_MULTICAST_ALL:
1352 case IPV6_UNICAST_IF:
1353 val = (__force int)htonl((__u32) np->ucast_oif);
1356 case IPV6_MTU_DISCOVER:
1364 case IPV6_FLOWINFO_SEND:
1368 case IPV6_FLOWLABEL_MGR:
1370 struct in6_flowlabel_req freq;
1373 if (len < sizeof(freq))
1376 if (copy_from_user(&freq, optval, sizeof(freq)))
1379 if (freq.flr_action != IPV6_FL_A_GET)
1383 flags = freq.flr_flags;
1385 memset(&freq, 0, sizeof(freq));
1387 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1391 if (put_user(len, optlen))
1393 if (copy_to_user(optval, &freq, len))
1399 case IPV6_ADDR_PREFERENCES:
1402 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1403 val |= IPV6_PREFER_SRC_TMP;
1404 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1405 val |= IPV6_PREFER_SRC_PUBLIC;
1407 /* XXX: should we return system default? */
1408 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1411 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1412 val |= IPV6_PREFER_SRC_COA;
1414 val |= IPV6_PREFER_SRC_HOME;
1417 case IPV6_MINHOPCOUNT:
1418 val = np->min_hopcount;
1425 case IPV6_AUTOFLOWLABEL:
1426 val = ip6_autoflowlabel(sock_net(sk), np);
1429 case IPV6_RECVFRAGSIZE:
1430 val = np->rxopt.bits.recvfragsize;
1433 case IPV6_ROUTER_ALERT_ISOLATE:
1434 val = np->rtalert_isolate;
1438 return -ENOPROTOOPT;
1440 len = min_t(unsigned int, sizeof(int), len);
1441 if (put_user(len, optlen))
1443 if (copy_to_user(optval, &val, len))
1448 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1449 char __user *optval, int __user *optlen)
1453 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1454 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1456 if (level != SOL_IPV6)
1457 return -ENOPROTOOPT;
1459 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1460 #ifdef CONFIG_NETFILTER
1461 /* we need to exclude all possible ENOPROTOOPTs except default case */
1462 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1465 if (get_user(len, optlen))
1468 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1470 err = put_user(len, optlen);
1475 EXPORT_SYMBOL(ipv6_getsockopt);
1477 #ifdef CONFIG_COMPAT
1478 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1479 char __user *optval, int __user *optlen)
1483 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1484 if (udp_prot.compat_getsockopt != NULL)
1485 return udp_prot.compat_getsockopt(sk, level, optname,
1487 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1490 if (level != SOL_IPV6)
1491 return -ENOPROTOOPT;
1493 if (optname == MCAST_MSFILTER) {
1494 const int size0 = offsetof(struct compat_group_filter, gf_slist);
1495 struct compat_group_filter __user *p = (void __user *)optval;
1496 struct compat_group_filter gf32;
1497 struct group_filter gf;
1501 if (get_user(ulen, optlen))
1507 if (copy_from_user(&gf32, p, size0))
1510 gf.gf_interface = gf32.gf_interface;
1511 gf.gf_fmode = gf32.gf_fmode;
1512 num = gf.gf_numsrc = gf32.gf_numsrc;
1513 gf.gf_group = gf32.gf_group;
1515 if (gf.gf_group.ss_family != AF_INET6)
1516 return -EADDRNOTAVAIL;
1518 err = ip6_mc_msfget(sk, &gf, p->gf_slist);
1522 if (num > gf.gf_numsrc)
1524 ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1525 if (put_user(ulen, optlen) ||
1526 put_user(gf.gf_fmode, &p->gf_fmode) ||
1527 put_user(gf.gf_numsrc, &p->gf_numsrc))
1532 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1534 #ifdef CONFIG_NETFILTER
1535 /* we need to exclude all possible ENOPROTOOPTs except default case */
1536 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1539 if (get_user(len, optlen))
1542 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1544 err = put_user(len, optlen);
1549 EXPORT_SYMBOL(compat_ipv6_getsockopt);