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 copy_group_source_from_sockptr(struct group_source_req *greqs,
140 sockptr_t optval, int optlen)
142 if (in_compat_syscall()) {
143 struct compat_group_source_req gr32;
145 if (optlen < sizeof(gr32))
147 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
149 greqs->gsr_interface = gr32.gsr_interface;
150 greqs->gsr_group = gr32.gsr_group;
151 greqs->gsr_source = gr32.gsr_source;
153 if (optlen < sizeof(*greqs))
155 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
162 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
163 sockptr_t optval, int optlen)
165 struct group_source_req greqs;
169 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
173 if (greqs.gsr_group.ss_family != AF_INET6 ||
174 greqs.gsr_source.ss_family != AF_INET6)
175 return -EADDRNOTAVAIL;
177 if (optname == MCAST_BLOCK_SOURCE) {
178 omode = MCAST_EXCLUDE;
180 } else if (optname == MCAST_UNBLOCK_SOURCE) {
181 omode = MCAST_EXCLUDE;
183 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
184 struct sockaddr_in6 *psin6;
187 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
188 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
191 /* prior join w/ different source is ok */
192 if (retv && retv != -EADDRINUSE)
194 omode = MCAST_INCLUDE;
196 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
197 omode = MCAST_INCLUDE;
200 return ip6_mc_source(add, omode, sk, &greqs);
203 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
206 struct group_filter *gsf;
209 if (optlen < GROUP_FILTER_SIZE(0))
211 if (optlen > READ_ONCE(sysctl_optmem_max))
214 gsf = memdup_sockptr(optval, optlen);
218 /* numsrc >= (4G-140)/128 overflow in 32 bits */
220 if (gsf->gf_numsrc >= 0x1ffffffU ||
221 gsf->gf_numsrc > sysctl_mld_max_msf)
225 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
228 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
234 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
237 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
238 struct compat_group_filter *gf32;
245 if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
248 p = kmalloc(optlen + 4, GFP_KERNEL);
252 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
254 if (copy_from_sockptr(gf32, optval, optlen))
257 /* numsrc >= (4G-140)/128 overflow in 32 bits */
260 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
264 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
267 ret = ip6_mc_msfilter(sk, &(struct group_filter){
268 .gf_interface = gf32->gf_interface,
269 .gf_group = gf32->gf_group,
270 .gf_fmode = gf32->gf_fmode,
271 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
278 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
279 sockptr_t optval, int optlen)
281 struct sockaddr_in6 *psin6;
282 struct group_req greq;
284 if (optlen < sizeof(greq))
286 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
289 if (greq.gr_group.ss_family != AF_INET6)
290 return -EADDRNOTAVAIL;
291 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
292 if (optname == MCAST_JOIN_GROUP)
293 return ipv6_sock_mc_join(sk, greq.gr_interface,
295 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
298 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
299 sockptr_t optval, int optlen)
301 struct compat_group_req gr32;
302 struct sockaddr_in6 *psin6;
304 if (optlen < sizeof(gr32))
306 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
309 if (gr32.gr_group.ss_family != AF_INET6)
310 return -EADDRNOTAVAIL;
311 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
312 if (optname == MCAST_JOIN_GROUP)
313 return ipv6_sock_mc_join(sk, gr32.gr_interface,
315 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
318 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
321 struct ipv6_pinfo *np = inet6_sk(sk);
322 struct ipv6_opt_hdr *new = NULL;
323 struct net *net = sock_net(sk);
324 struct ipv6_txoptions *opt;
327 /* hop-by-hop / destination options are privileged option */
328 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
331 /* remove any sticky options header with a zero option
332 * length, per RFC3542.
335 if (sockptr_is_null(optval))
337 if (optlen < sizeof(struct ipv6_opt_hdr) ||
342 new = memdup_sockptr(optval, optlen);
345 if (unlikely(ipv6_optlen(new) > optlen)) {
351 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
352 opt = ipv6_renew_options(sk, opt, optname, new);
357 /* routing header option needs extra check */
359 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
360 struct ipv6_rt_hdr *rthdr = opt->srcrt;
361 switch (rthdr->type) {
362 #if IS_ENABLED(CONFIG_IPV6_MIP6)
363 case IPV6_SRCRT_TYPE_2:
364 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
368 case IPV6_SRCRT_TYPE_4:
370 struct ipv6_sr_hdr *srh =
371 (struct ipv6_sr_hdr *)opt->srcrt;
373 if (!seg6_validate_srh(srh, optlen, false))
383 opt = ipv6_update_options(sk, opt);
386 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
392 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
393 sockptr_t optval, unsigned int optlen)
395 struct ipv6_pinfo *np = inet6_sk(sk);
396 struct net *net = sock_net(sk);
398 int retv = -ENOPROTOOPT;
399 bool needs_rtnl = setsockopt_needs_rtnl(optname);
401 if (sockptr_is_null(optval))
404 if (optlen >= sizeof(int)) {
405 if (copy_from_sockptr(&val, optval, sizeof(val)))
411 valbool = (val != 0);
413 if (ip6_mroute_opt(optname))
414 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
420 /* Another thread has converted the socket into IPv4 with
421 * IPV6_ADDRFORM concurrently.
423 if (unlikely(sk->sk_family != AF_INET6))
429 if (optlen < sizeof(int))
431 if (val == PF_INET) {
432 struct ipv6_txoptions *opt;
433 struct sk_buff *pktopt;
435 if (sk->sk_type == SOCK_RAW)
438 if (sk->sk_protocol == IPPROTO_UDP ||
439 sk->sk_protocol == IPPROTO_UDPLITE) {
440 struct udp_sock *up = udp_sk(sk);
441 if (up->pending == AF_INET6) {
445 } else if (sk->sk_protocol == IPPROTO_TCP) {
446 if (sk->sk_prot != &tcpv6_prot) {
454 if (sk->sk_state != TCP_ESTABLISHED) {
459 if (ipv6_only_sock(sk) ||
460 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
461 retv = -EADDRNOTAVAIL;
465 fl6_free_socklist(sk);
466 __ipv6_sock_mc_close(sk);
467 __ipv6_sock_ac_close(sk);
470 * Sock is moving from IPv6 to IPv4 (sk_prot), so
471 * remove it from the refcnt debug socks count in the
474 sk_refcnt_debug_dec(sk);
476 if (sk->sk_protocol == IPPROTO_TCP) {
477 struct inet_connection_sock *icsk = inet_csk(sk);
479 sock_prot_inuse_add(net, sk->sk_prot, -1);
480 sock_prot_inuse_add(net, &tcp_prot, 1);
482 sk->sk_prot = &tcp_prot;
483 icsk->icsk_af_ops = &ipv4_specific;
484 sk->sk_socket->ops = &inet_stream_ops;
485 sk->sk_family = PF_INET;
486 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
488 struct proto *prot = &udp_prot;
490 if (sk->sk_protocol == IPPROTO_UDPLITE)
491 prot = &udplite_prot;
493 sock_prot_inuse_add(net, sk->sk_prot, -1);
494 sock_prot_inuse_add(net, prot, 1);
497 sk->sk_socket->ops = &inet_dgram_ops;
498 sk->sk_family = PF_INET;
500 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
503 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
506 pktopt = xchg(&np->pktoptions, NULL);
510 * ... and add it to the refcnt debug socks count
511 * in the new family. -acme
513 sk_refcnt_debug_inc(sk);
514 module_put(THIS_MODULE);
521 if (optlen < sizeof(int) ||
522 inet_sk(sk)->inet_num)
524 sk->sk_ipv6only = valbool;
528 case IPV6_RECVPKTINFO:
529 if (optlen < sizeof(int))
531 np->rxopt.bits.rxinfo = valbool;
535 case IPV6_2292PKTINFO:
536 if (optlen < sizeof(int))
538 np->rxopt.bits.rxoinfo = valbool;
542 case IPV6_RECVHOPLIMIT:
543 if (optlen < sizeof(int))
545 np->rxopt.bits.rxhlim = valbool;
549 case IPV6_2292HOPLIMIT:
550 if (optlen < sizeof(int))
552 np->rxopt.bits.rxohlim = valbool;
557 if (optlen < sizeof(int))
559 np->rxopt.bits.srcrt = valbool;
564 if (optlen < sizeof(int))
566 np->rxopt.bits.osrcrt = valbool;
570 case IPV6_RECVHOPOPTS:
571 if (optlen < sizeof(int))
573 np->rxopt.bits.hopopts = valbool;
577 case IPV6_2292HOPOPTS:
578 if (optlen < sizeof(int))
580 np->rxopt.bits.ohopopts = valbool;
584 case IPV6_RECVDSTOPTS:
585 if (optlen < sizeof(int))
587 np->rxopt.bits.dstopts = valbool;
591 case IPV6_2292DSTOPTS:
592 if (optlen < sizeof(int))
594 np->rxopt.bits.odstopts = valbool;
599 if (optlen < sizeof(int))
601 if (val < -1 || val > 0xff)
603 /* RFC 3542, 6.5: default traffic class of 0x0 */
610 case IPV6_RECVTCLASS:
611 if (optlen < sizeof(int))
613 np->rxopt.bits.rxtclass = valbool;
618 if (optlen < sizeof(int))
620 np->rxopt.bits.rxflow = valbool;
624 case IPV6_RECVPATHMTU:
625 if (optlen < sizeof(int))
627 np->rxopt.bits.rxpmtu = valbool;
631 case IPV6_TRANSPARENT:
632 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
633 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
637 if (optlen < sizeof(int))
639 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
640 inet_sk(sk)->transparent = valbool;
645 if (optlen < sizeof(int))
647 /* we also don't have a separate freebind bit for IPV6 */
648 inet_sk(sk)->freebind = valbool;
652 case IPV6_RECVORIGDSTADDR:
653 if (optlen < sizeof(int))
655 np->rxopt.bits.rxorigdstaddr = valbool;
660 case IPV6_RTHDRDSTOPTS:
663 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
668 struct in6_pktinfo pkt;
672 else if (optlen < sizeof(struct in6_pktinfo) ||
673 sockptr_is_null(optval))
676 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
680 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
683 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
684 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
689 case IPV6_2292PKTOPTIONS:
691 struct ipv6_txoptions *opt = NULL;
694 struct ipcm6_cookie ipc6;
696 memset(&fl6, 0, sizeof(fl6));
697 fl6.flowi6_oif = sk->sk_bound_dev_if;
698 fl6.flowi6_mark = sk->sk_mark;
703 /* 1K is probably excessive
704 * 1K is surely not enough, 2K per standard header is 16K.
707 if (optlen > 64*1024)
710 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
715 memset(opt, 0, sizeof(*opt));
716 refcount_set(&opt->refcnt, 1);
717 opt->tot_len = sizeof(*opt) + optlen;
719 if (copy_from_sockptr(opt + 1, optval, optlen))
722 msg.msg_controllen = optlen;
723 msg.msg_control = (void *)(opt+1);
726 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
731 opt = ipv6_update_options(sk, opt);
734 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
739 case IPV6_UNICAST_HOPS:
740 if (optlen < sizeof(int))
742 if (val > 255 || val < -1)
748 case IPV6_MULTICAST_HOPS:
749 if (sk->sk_type == SOCK_STREAM)
751 if (optlen < sizeof(int))
753 if (val > 255 || val < -1)
755 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
759 case IPV6_MULTICAST_LOOP:
760 if (optlen < sizeof(int))
764 np->mc_loop = valbool;
768 case IPV6_UNICAST_IF:
770 struct net_device *dev = NULL;
773 if (optlen != sizeof(int))
776 ifindex = (__force int)ntohl((__force __be32)val);
783 dev = dev_get_by_index(net, ifindex);
784 retv = -EADDRNOTAVAIL;
790 if (sk->sk_bound_dev_if)
793 np->ucast_oif = ifindex;
798 case IPV6_MULTICAST_IF:
799 if (sk->sk_type == SOCK_STREAM)
801 if (optlen < sizeof(int))
805 struct net_device *dev;
810 dev = dev_get_by_index_rcu(net, val);
816 midx = l3mdev_master_ifindex_rcu(dev);
820 if (sk->sk_bound_dev_if &&
821 sk->sk_bound_dev_if != val &&
822 (!midx || midx != sk->sk_bound_dev_if))
828 case IPV6_ADD_MEMBERSHIP:
829 case IPV6_DROP_MEMBERSHIP:
831 struct ipv6_mreq mreq;
833 if (optlen < sizeof(struct ipv6_mreq))
837 if (inet_sk(sk)->is_icsk)
841 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
844 if (optname == IPV6_ADD_MEMBERSHIP)
845 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
847 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
850 case IPV6_JOIN_ANYCAST:
851 case IPV6_LEAVE_ANYCAST:
853 struct ipv6_mreq mreq;
855 if (optlen < sizeof(struct ipv6_mreq))
859 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
862 if (optname == IPV6_JOIN_ANYCAST)
863 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
865 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
868 case IPV6_MULTICAST_ALL:
869 if (optlen < sizeof(int))
871 np->mc_all = valbool;
875 case MCAST_JOIN_GROUP:
876 case MCAST_LEAVE_GROUP:
877 if (in_compat_syscall())
878 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
881 retv = ipv6_mcast_join_leave(sk, optname, optval,
884 case MCAST_JOIN_SOURCE_GROUP:
885 case MCAST_LEAVE_SOURCE_GROUP:
886 case MCAST_BLOCK_SOURCE:
887 case MCAST_UNBLOCK_SOURCE:
888 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
891 if (in_compat_syscall())
892 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
895 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
897 case IPV6_ROUTER_ALERT:
898 if (optlen < sizeof(int))
900 retv = ip6_ra_control(sk, val);
902 case IPV6_ROUTER_ALERT_ISOLATE:
903 if (optlen < sizeof(int))
905 np->rtalert_isolate = valbool;
908 case IPV6_MTU_DISCOVER:
909 if (optlen < sizeof(int))
911 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
917 if (optlen < sizeof(int))
919 if (val && val < IPV6_MIN_MTU)
925 if (optlen < sizeof(int))
927 np->recverr = valbool;
929 skb_queue_purge(&sk->sk_error_queue);
932 case IPV6_FLOWINFO_SEND:
933 if (optlen < sizeof(int))
935 np->sndflow = valbool;
938 case IPV6_FLOWLABEL_MGR:
939 retv = ipv6_flowlabel_opt(sk, optval, optlen);
941 case IPV6_IPSEC_POLICY:
942 case IPV6_XFRM_POLICY:
944 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
946 retv = xfrm_user_policy(sk, optname, optval, optlen);
949 case IPV6_ADDR_PREFERENCES:
950 if (optlen < sizeof(int))
952 retv = __ip6_sock_set_addr_preferences(sk, val);
954 case IPV6_MINHOPCOUNT:
955 if (optlen < sizeof(int))
957 if (val < 0 || val > 255)
959 np->min_hopcount = val;
963 np->dontfrag = valbool;
966 case IPV6_AUTOFLOWLABEL:
967 np->autoflowlabel = valbool;
968 np->autoflowlabel_set = 1;
971 case IPV6_RECVFRAGSIZE:
972 np->rxopt.bits.recvfragsize = valbool;
975 case IPV6_RECVERR_RFC4884:
976 if (optlen < sizeof(int))
978 if (val < 0 || val > 1)
980 np->recverr_rfc4884 = valbool;
999 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1000 unsigned int optlen)
1004 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1005 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1007 if (level != SOL_IPV6)
1008 return -ENOPROTOOPT;
1010 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1011 #ifdef CONFIG_NETFILTER
1012 /* we need to exclude all possible ENOPROTOOPTs except default case */
1013 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1014 optname != IPV6_XFRM_POLICY)
1015 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1019 EXPORT_SYMBOL(ipv6_setsockopt);
1021 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1022 int optname, char __user *optval, int len)
1024 struct ipv6_opt_hdr *hdr;
1033 case IPV6_RTHDRDSTOPTS:
1037 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1043 return -EINVAL; /* should not happen */
1049 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1050 if (copy_to_user(optval, hdr, len))
1055 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1056 int __user *optlen, int len)
1058 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1059 struct group_filter __user *p = optval;
1060 struct group_filter gsf;
1066 if (copy_from_user(&gsf, p, size0))
1068 if (gsf.gf_group.ss_family != AF_INET6)
1069 return -EADDRNOTAVAIL;
1070 num = gsf.gf_numsrc;
1072 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1074 if (num > gsf.gf_numsrc)
1075 num = gsf.gf_numsrc;
1076 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1077 copy_to_user(p, &gsf, size0))
1084 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1087 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1088 struct compat_group_filter __user *p = optval;
1089 struct compat_group_filter gf32;
1090 struct group_filter gf;
1094 if (get_user(len, optlen))
1099 if (copy_from_user(&gf32, p, size0))
1101 gf.gf_interface = gf32.gf_interface;
1102 gf.gf_fmode = gf32.gf_fmode;
1103 num = gf.gf_numsrc = gf32.gf_numsrc;
1104 gf.gf_group = gf32.gf_group;
1106 if (gf.gf_group.ss_family != AF_INET6)
1107 return -EADDRNOTAVAIL;
1110 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1114 if (num > gf.gf_numsrc)
1116 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1117 if (put_user(len, optlen) ||
1118 put_user(gf.gf_fmode, &p->gf_fmode) ||
1119 put_user(gf.gf_numsrc, &p->gf_numsrc))
1124 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1125 char __user *optval, int __user *optlen, unsigned int flags)
1127 struct ipv6_pinfo *np = inet6_sk(sk);
1131 if (ip6_mroute_opt(optname))
1132 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1134 if (get_user(len, optlen))
1138 if (sk->sk_protocol != IPPROTO_UDP &&
1139 sk->sk_protocol != IPPROTO_UDPLITE &&
1140 sk->sk_protocol != IPPROTO_TCP)
1141 return -ENOPROTOOPT;
1142 if (sk->sk_state != TCP_ESTABLISHED)
1144 val = sk->sk_family;
1146 case MCAST_MSFILTER:
1147 if (in_compat_syscall())
1148 return compat_ipv6_get_msfilter(sk, optval, optlen);
1149 return ipv6_get_msfilter(sk, optval, optlen, len);
1150 case IPV6_2292PKTOPTIONS:
1153 struct sk_buff *skb;
1155 if (sk->sk_type != SOCK_STREAM)
1156 return -ENOPROTOOPT;
1158 msg.msg_control_user = optval;
1159 msg.msg_controllen = len;
1160 msg.msg_flags = flags;
1161 msg.msg_control_is_user = true;
1164 skb = np->pktoptions;
1166 ip6_datagram_recv_ctl(sk, &msg, skb);
1169 if (np->rxopt.bits.rxinfo) {
1170 struct in6_pktinfo src_info;
1171 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1172 np->sticky_pktinfo.ipi6_ifindex;
1173 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1174 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1176 if (np->rxopt.bits.rxhlim) {
1177 int hlim = np->mcast_hops;
1178 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1180 if (np->rxopt.bits.rxtclass) {
1181 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1183 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1185 if (np->rxopt.bits.rxoinfo) {
1186 struct in6_pktinfo src_info;
1187 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1188 np->sticky_pktinfo.ipi6_ifindex;
1189 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1190 np->sticky_pktinfo.ipi6_addr;
1191 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1193 if (np->rxopt.bits.rxohlim) {
1194 int hlim = np->mcast_hops;
1195 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1197 if (np->rxopt.bits.rxflow) {
1198 __be32 flowinfo = np->rcv_flowinfo;
1200 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1203 len -= msg.msg_controllen;
1204 return put_user(len, optlen);
1208 struct dst_entry *dst;
1212 dst = __sk_dst_get(sk);
1222 val = sk->sk_ipv6only;
1225 case IPV6_RECVPKTINFO:
1226 val = np->rxopt.bits.rxinfo;
1229 case IPV6_2292PKTINFO:
1230 val = np->rxopt.bits.rxoinfo;
1233 case IPV6_RECVHOPLIMIT:
1234 val = np->rxopt.bits.rxhlim;
1237 case IPV6_2292HOPLIMIT:
1238 val = np->rxopt.bits.rxohlim;
1241 case IPV6_RECVRTHDR:
1242 val = np->rxopt.bits.srcrt;
1245 case IPV6_2292RTHDR:
1246 val = np->rxopt.bits.osrcrt;
1250 case IPV6_RTHDRDSTOPTS:
1254 struct ipv6_txoptions *opt;
1257 opt = rcu_dereference_protected(np->opt,
1258 lockdep_sock_is_held(sk));
1259 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1261 /* check if ipv6_getsockopt_sticky() returns err code */
1264 return put_user(len, optlen);
1267 case IPV6_RECVHOPOPTS:
1268 val = np->rxopt.bits.hopopts;
1271 case IPV6_2292HOPOPTS:
1272 val = np->rxopt.bits.ohopopts;
1275 case IPV6_RECVDSTOPTS:
1276 val = np->rxopt.bits.dstopts;
1279 case IPV6_2292DSTOPTS:
1280 val = np->rxopt.bits.odstopts;
1287 case IPV6_RECVTCLASS:
1288 val = np->rxopt.bits.rxtclass;
1292 val = np->rxopt.bits.rxflow;
1295 case IPV6_RECVPATHMTU:
1296 val = np->rxopt.bits.rxpmtu;
1301 struct dst_entry *dst;
1302 struct ip6_mtuinfo mtuinfo;
1304 if (len < sizeof(mtuinfo))
1307 len = sizeof(mtuinfo);
1308 memset(&mtuinfo, 0, sizeof(mtuinfo));
1311 dst = __sk_dst_get(sk);
1313 mtuinfo.ip6m_mtu = dst_mtu(dst);
1315 if (!mtuinfo.ip6m_mtu)
1318 if (put_user(len, optlen))
1320 if (copy_to_user(optval, &mtuinfo, len))
1326 case IPV6_TRANSPARENT:
1327 val = inet_sk(sk)->transparent;
1331 val = inet_sk(sk)->freebind;
1334 case IPV6_RECVORIGDSTADDR:
1335 val = np->rxopt.bits.rxorigdstaddr;
1338 case IPV6_UNICAST_HOPS:
1339 case IPV6_MULTICAST_HOPS:
1341 struct dst_entry *dst;
1343 if (optname == IPV6_UNICAST_HOPS)
1344 val = np->hop_limit;
1346 val = np->mcast_hops;
1350 dst = __sk_dst_get(sk);
1352 val = ip6_dst_hoplimit(dst);
1357 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1361 case IPV6_MULTICAST_LOOP:
1365 case IPV6_MULTICAST_IF:
1366 val = np->mcast_oif;
1369 case IPV6_MULTICAST_ALL:
1373 case IPV6_UNICAST_IF:
1374 val = (__force int)htonl((__u32) np->ucast_oif);
1377 case IPV6_MTU_DISCOVER:
1385 case IPV6_FLOWINFO_SEND:
1389 case IPV6_FLOWLABEL_MGR:
1391 struct in6_flowlabel_req freq;
1394 if (len < sizeof(freq))
1397 if (copy_from_user(&freq, optval, sizeof(freq)))
1400 if (freq.flr_action != IPV6_FL_A_GET)
1404 flags = freq.flr_flags;
1406 memset(&freq, 0, sizeof(freq));
1408 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1412 if (put_user(len, optlen))
1414 if (copy_to_user(optval, &freq, len))
1420 case IPV6_ADDR_PREFERENCES:
1423 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1424 val |= IPV6_PREFER_SRC_TMP;
1425 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1426 val |= IPV6_PREFER_SRC_PUBLIC;
1428 /* XXX: should we return system default? */
1429 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1432 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1433 val |= IPV6_PREFER_SRC_COA;
1435 val |= IPV6_PREFER_SRC_HOME;
1438 case IPV6_MINHOPCOUNT:
1439 val = np->min_hopcount;
1446 case IPV6_AUTOFLOWLABEL:
1447 val = ip6_autoflowlabel(sock_net(sk), np);
1450 case IPV6_RECVFRAGSIZE:
1451 val = np->rxopt.bits.recvfragsize;
1454 case IPV6_ROUTER_ALERT_ISOLATE:
1455 val = np->rtalert_isolate;
1458 case IPV6_RECVERR_RFC4884:
1459 val = np->recverr_rfc4884;
1463 return -ENOPROTOOPT;
1465 len = min_t(unsigned int, sizeof(int), len);
1466 if (put_user(len, optlen))
1468 if (copy_to_user(optval, &val, len))
1473 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1474 char __user *optval, int __user *optlen)
1478 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1479 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1481 if (level != SOL_IPV6)
1482 return -ENOPROTOOPT;
1484 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1485 #ifdef CONFIG_NETFILTER
1486 /* we need to exclude all possible ENOPROTOOPTs except default case */
1487 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1490 if (get_user(len, optlen))
1493 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1495 err = put_user(len, optlen);
1500 EXPORT_SYMBOL(ipv6_getsockopt);