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 if (sk->sk_type == SOCK_RAW)
435 if (sk->sk_protocol == IPPROTO_UDP ||
436 sk->sk_protocol == IPPROTO_UDPLITE) {
437 struct udp_sock *up = udp_sk(sk);
438 if (up->pending == AF_INET6) {
442 } else if (sk->sk_protocol == IPPROTO_TCP) {
443 if (sk->sk_prot != &tcpv6_prot) {
451 if (sk->sk_state != TCP_ESTABLISHED) {
456 if (ipv6_only_sock(sk) ||
457 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
458 retv = -EADDRNOTAVAIL;
462 __ipv6_sock_mc_close(sk);
463 __ipv6_sock_ac_close(sk);
466 * Sock is moving from IPv6 to IPv4 (sk_prot), so
467 * remove it from the refcnt debug socks count in the
470 sk_refcnt_debug_dec(sk);
472 if (sk->sk_protocol == IPPROTO_TCP) {
473 struct inet_connection_sock *icsk = inet_csk(sk);
475 sock_prot_inuse_add(net, sk->sk_prot, -1);
476 sock_prot_inuse_add(net, &tcp_prot, 1);
478 sk->sk_prot = &tcp_prot;
479 icsk->icsk_af_ops = &ipv4_specific;
480 sk->sk_socket->ops = &inet_stream_ops;
481 sk->sk_family = PF_INET;
482 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
484 struct proto *prot = &udp_prot;
486 if (sk->sk_protocol == IPPROTO_UDPLITE)
487 prot = &udplite_prot;
489 sock_prot_inuse_add(net, sk->sk_prot, -1);
490 sock_prot_inuse_add(net, prot, 1);
493 sk->sk_socket->ops = &inet_dgram_ops;
494 sk->sk_family = PF_INET;
497 /* Disable all options not to allocate memory anymore,
498 * but there is still a race. See the lockless path
499 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
503 inet6_cleanup_sock(sk);
506 * ... and add it to the refcnt debug socks count
507 * in the new family. -acme
509 sk_refcnt_debug_inc(sk);
510 module_put(THIS_MODULE);
517 if (optlen < sizeof(int) ||
518 inet_sk(sk)->inet_num)
520 sk->sk_ipv6only = valbool;
524 case IPV6_RECVPKTINFO:
525 if (optlen < sizeof(int))
527 np->rxopt.bits.rxinfo = valbool;
531 case IPV6_2292PKTINFO:
532 if (optlen < sizeof(int))
534 np->rxopt.bits.rxoinfo = valbool;
538 case IPV6_RECVHOPLIMIT:
539 if (optlen < sizeof(int))
541 np->rxopt.bits.rxhlim = valbool;
545 case IPV6_2292HOPLIMIT:
546 if (optlen < sizeof(int))
548 np->rxopt.bits.rxohlim = valbool;
553 if (optlen < sizeof(int))
555 np->rxopt.bits.srcrt = valbool;
560 if (optlen < sizeof(int))
562 np->rxopt.bits.osrcrt = valbool;
566 case IPV6_RECVHOPOPTS:
567 if (optlen < sizeof(int))
569 np->rxopt.bits.hopopts = valbool;
573 case IPV6_2292HOPOPTS:
574 if (optlen < sizeof(int))
576 np->rxopt.bits.ohopopts = valbool;
580 case IPV6_RECVDSTOPTS:
581 if (optlen < sizeof(int))
583 np->rxopt.bits.dstopts = valbool;
587 case IPV6_2292DSTOPTS:
588 if (optlen < sizeof(int))
590 np->rxopt.bits.odstopts = valbool;
595 if (optlen < sizeof(int))
597 if (val < -1 || val > 0xff)
599 /* RFC 3542, 6.5: default traffic class of 0x0 */
606 case IPV6_RECVTCLASS:
607 if (optlen < sizeof(int))
609 np->rxopt.bits.rxtclass = valbool;
614 if (optlen < sizeof(int))
616 np->rxopt.bits.rxflow = valbool;
620 case IPV6_RECVPATHMTU:
621 if (optlen < sizeof(int))
623 np->rxopt.bits.rxpmtu = valbool;
627 case IPV6_TRANSPARENT:
628 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
629 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
633 if (optlen < sizeof(int))
635 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
636 inet_sk(sk)->transparent = valbool;
641 if (optlen < sizeof(int))
643 /* we also don't have a separate freebind bit for IPV6 */
644 inet_sk(sk)->freebind = valbool;
648 case IPV6_RECVORIGDSTADDR:
649 if (optlen < sizeof(int))
651 np->rxopt.bits.rxorigdstaddr = valbool;
656 case IPV6_RTHDRDSTOPTS:
659 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
664 struct in6_pktinfo pkt;
668 else if (optlen < sizeof(struct in6_pktinfo) ||
669 sockptr_is_null(optval))
672 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
676 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
679 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
680 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
685 case IPV6_2292PKTOPTIONS:
687 struct ipv6_txoptions *opt = NULL;
690 struct ipcm6_cookie ipc6;
692 memset(&fl6, 0, sizeof(fl6));
693 fl6.flowi6_oif = sk->sk_bound_dev_if;
694 fl6.flowi6_mark = sk->sk_mark;
699 /* 1K is probably excessive
700 * 1K is surely not enough, 2K per standard header is 16K.
703 if (optlen > 64*1024)
706 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
711 memset(opt, 0, sizeof(*opt));
712 refcount_set(&opt->refcnt, 1);
713 opt->tot_len = sizeof(*opt) + optlen;
715 if (copy_from_sockptr(opt + 1, optval, optlen))
718 msg.msg_controllen = optlen;
719 msg.msg_control = (void *)(opt+1);
722 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
727 opt = ipv6_update_options(sk, opt);
730 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
735 case IPV6_UNICAST_HOPS:
736 if (optlen < sizeof(int))
738 if (val > 255 || val < -1)
744 case IPV6_MULTICAST_HOPS:
745 if (sk->sk_type == SOCK_STREAM)
747 if (optlen < sizeof(int))
749 if (val > 255 || val < -1)
751 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
755 case IPV6_MULTICAST_LOOP:
756 if (optlen < sizeof(int))
760 np->mc_loop = valbool;
764 case IPV6_UNICAST_IF:
766 struct net_device *dev = NULL;
769 if (optlen != sizeof(int))
772 ifindex = (__force int)ntohl((__force __be32)val);
779 dev = dev_get_by_index(net, ifindex);
780 retv = -EADDRNOTAVAIL;
786 if (sk->sk_bound_dev_if)
789 np->ucast_oif = ifindex;
794 case IPV6_MULTICAST_IF:
795 if (sk->sk_type == SOCK_STREAM)
797 if (optlen < sizeof(int))
801 struct net_device *dev;
806 dev = dev_get_by_index_rcu(net, val);
812 midx = l3mdev_master_ifindex_rcu(dev);
816 if (sk->sk_bound_dev_if &&
817 sk->sk_bound_dev_if != val &&
818 (!midx || midx != sk->sk_bound_dev_if))
824 case IPV6_ADD_MEMBERSHIP:
825 case IPV6_DROP_MEMBERSHIP:
827 struct ipv6_mreq mreq;
829 if (optlen < sizeof(struct ipv6_mreq))
833 if (inet_sk(sk)->is_icsk)
837 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
840 if (optname == IPV6_ADD_MEMBERSHIP)
841 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
843 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
846 case IPV6_JOIN_ANYCAST:
847 case IPV6_LEAVE_ANYCAST:
849 struct ipv6_mreq mreq;
851 if (optlen < sizeof(struct ipv6_mreq))
855 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
858 if (optname == IPV6_JOIN_ANYCAST)
859 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
861 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
864 case IPV6_MULTICAST_ALL:
865 if (optlen < sizeof(int))
867 np->mc_all = valbool;
871 case MCAST_JOIN_GROUP:
872 case MCAST_LEAVE_GROUP:
873 if (in_compat_syscall())
874 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
877 retv = ipv6_mcast_join_leave(sk, optname, optval,
880 case MCAST_JOIN_SOURCE_GROUP:
881 case MCAST_LEAVE_SOURCE_GROUP:
882 case MCAST_BLOCK_SOURCE:
883 case MCAST_UNBLOCK_SOURCE:
884 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
887 if (in_compat_syscall())
888 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
891 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
893 case IPV6_ROUTER_ALERT:
894 if (optlen < sizeof(int))
896 retv = ip6_ra_control(sk, val);
898 case IPV6_ROUTER_ALERT_ISOLATE:
899 if (optlen < sizeof(int))
901 np->rtalert_isolate = valbool;
904 case IPV6_MTU_DISCOVER:
905 if (optlen < sizeof(int))
907 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
913 if (optlen < sizeof(int))
915 if (val && val < IPV6_MIN_MTU)
921 if (optlen < sizeof(int))
923 np->recverr = valbool;
925 skb_queue_purge(&sk->sk_error_queue);
928 case IPV6_FLOWINFO_SEND:
929 if (optlen < sizeof(int))
931 np->sndflow = valbool;
934 case IPV6_FLOWLABEL_MGR:
935 retv = ipv6_flowlabel_opt(sk, optval, optlen);
937 case IPV6_IPSEC_POLICY:
938 case IPV6_XFRM_POLICY:
940 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
942 retv = xfrm_user_policy(sk, optname, optval, optlen);
945 case IPV6_ADDR_PREFERENCES:
946 if (optlen < sizeof(int))
948 retv = __ip6_sock_set_addr_preferences(sk, val);
950 case IPV6_MINHOPCOUNT:
951 if (optlen < sizeof(int))
953 if (val < 0 || val > 255)
955 np->min_hopcount = val;
959 np->dontfrag = valbool;
962 case IPV6_AUTOFLOWLABEL:
963 np->autoflowlabel = valbool;
964 np->autoflowlabel_set = 1;
967 case IPV6_RECVFRAGSIZE:
968 np->rxopt.bits.recvfragsize = valbool;
971 case IPV6_RECVERR_RFC4884:
972 if (optlen < sizeof(int))
974 if (val < 0 || val > 1)
976 np->recverr_rfc4884 = valbool;
995 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1000 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1001 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1003 if (level != SOL_IPV6)
1004 return -ENOPROTOOPT;
1006 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1007 #ifdef CONFIG_NETFILTER
1008 /* we need to exclude all possible ENOPROTOOPTs except default case */
1009 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1010 optname != IPV6_XFRM_POLICY)
1011 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1015 EXPORT_SYMBOL(ipv6_setsockopt);
1017 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1018 int optname, char __user *optval, int len)
1020 struct ipv6_opt_hdr *hdr;
1029 case IPV6_RTHDRDSTOPTS:
1033 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1039 return -EINVAL; /* should not happen */
1045 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1046 if (copy_to_user(optval, hdr, len))
1051 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1052 int __user *optlen, int len)
1054 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1055 struct group_filter __user *p = optval;
1056 struct group_filter gsf;
1062 if (copy_from_user(&gsf, p, size0))
1064 if (gsf.gf_group.ss_family != AF_INET6)
1065 return -EADDRNOTAVAIL;
1066 num = gsf.gf_numsrc;
1068 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1070 if (num > gsf.gf_numsrc)
1071 num = gsf.gf_numsrc;
1072 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1073 copy_to_user(p, &gsf, size0))
1080 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1083 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1084 struct compat_group_filter __user *p = optval;
1085 struct compat_group_filter gf32;
1086 struct group_filter gf;
1090 if (get_user(len, optlen))
1095 if (copy_from_user(&gf32, p, size0))
1097 gf.gf_interface = gf32.gf_interface;
1098 gf.gf_fmode = gf32.gf_fmode;
1099 num = gf.gf_numsrc = gf32.gf_numsrc;
1100 gf.gf_group = gf32.gf_group;
1102 if (gf.gf_group.ss_family != AF_INET6)
1103 return -EADDRNOTAVAIL;
1106 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1110 if (num > gf.gf_numsrc)
1112 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1113 if (put_user(len, optlen) ||
1114 put_user(gf.gf_fmode, &p->gf_fmode) ||
1115 put_user(gf.gf_numsrc, &p->gf_numsrc))
1120 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1121 char __user *optval, int __user *optlen, unsigned int flags)
1123 struct ipv6_pinfo *np = inet6_sk(sk);
1127 if (ip6_mroute_opt(optname))
1128 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1130 if (get_user(len, optlen))
1134 if (sk->sk_protocol != IPPROTO_UDP &&
1135 sk->sk_protocol != IPPROTO_UDPLITE &&
1136 sk->sk_protocol != IPPROTO_TCP)
1137 return -ENOPROTOOPT;
1138 if (sk->sk_state != TCP_ESTABLISHED)
1140 val = sk->sk_family;
1142 case MCAST_MSFILTER:
1143 if (in_compat_syscall())
1144 return compat_ipv6_get_msfilter(sk, optval, optlen);
1145 return ipv6_get_msfilter(sk, optval, optlen, len);
1146 case IPV6_2292PKTOPTIONS:
1149 struct sk_buff *skb;
1151 if (sk->sk_type != SOCK_STREAM)
1152 return -ENOPROTOOPT;
1154 msg.msg_control = optval;
1155 msg.msg_controllen = len;
1156 msg.msg_flags = flags;
1157 msg.msg_control_is_user = true;
1160 skb = np->pktoptions;
1162 ip6_datagram_recv_ctl(sk, &msg, skb);
1165 if (np->rxopt.bits.rxinfo) {
1166 struct in6_pktinfo src_info;
1167 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1168 np->sticky_pktinfo.ipi6_ifindex;
1169 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1170 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1172 if (np->rxopt.bits.rxhlim) {
1173 int hlim = np->mcast_hops;
1174 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1176 if (np->rxopt.bits.rxtclass) {
1177 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1179 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1181 if (np->rxopt.bits.rxoinfo) {
1182 struct in6_pktinfo src_info;
1183 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1184 np->sticky_pktinfo.ipi6_ifindex;
1185 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1186 np->sticky_pktinfo.ipi6_addr;
1187 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1189 if (np->rxopt.bits.rxohlim) {
1190 int hlim = np->mcast_hops;
1191 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1193 if (np->rxopt.bits.rxflow) {
1194 __be32 flowinfo = np->rcv_flowinfo;
1196 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1199 len -= msg.msg_controllen;
1200 return put_user(len, optlen);
1204 struct dst_entry *dst;
1208 dst = __sk_dst_get(sk);
1218 val = sk->sk_ipv6only;
1221 case IPV6_RECVPKTINFO:
1222 val = np->rxopt.bits.rxinfo;
1225 case IPV6_2292PKTINFO:
1226 val = np->rxopt.bits.rxoinfo;
1229 case IPV6_RECVHOPLIMIT:
1230 val = np->rxopt.bits.rxhlim;
1233 case IPV6_2292HOPLIMIT:
1234 val = np->rxopt.bits.rxohlim;
1237 case IPV6_RECVRTHDR:
1238 val = np->rxopt.bits.srcrt;
1241 case IPV6_2292RTHDR:
1242 val = np->rxopt.bits.osrcrt;
1246 case IPV6_RTHDRDSTOPTS:
1250 struct ipv6_txoptions *opt;
1253 opt = rcu_dereference_protected(np->opt,
1254 lockdep_sock_is_held(sk));
1255 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1257 /* check if ipv6_getsockopt_sticky() returns err code */
1260 return put_user(len, optlen);
1263 case IPV6_RECVHOPOPTS:
1264 val = np->rxopt.bits.hopopts;
1267 case IPV6_2292HOPOPTS:
1268 val = np->rxopt.bits.ohopopts;
1271 case IPV6_RECVDSTOPTS:
1272 val = np->rxopt.bits.dstopts;
1275 case IPV6_2292DSTOPTS:
1276 val = np->rxopt.bits.odstopts;
1283 case IPV6_RECVTCLASS:
1284 val = np->rxopt.bits.rxtclass;
1288 val = np->rxopt.bits.rxflow;
1291 case IPV6_RECVPATHMTU:
1292 val = np->rxopt.bits.rxpmtu;
1297 struct dst_entry *dst;
1298 struct ip6_mtuinfo mtuinfo;
1300 if (len < sizeof(mtuinfo))
1303 len = sizeof(mtuinfo);
1304 memset(&mtuinfo, 0, sizeof(mtuinfo));
1307 dst = __sk_dst_get(sk);
1309 mtuinfo.ip6m_mtu = dst_mtu(dst);
1311 if (!mtuinfo.ip6m_mtu)
1314 if (put_user(len, optlen))
1316 if (copy_to_user(optval, &mtuinfo, len))
1322 case IPV6_TRANSPARENT:
1323 val = inet_sk(sk)->transparent;
1327 val = inet_sk(sk)->freebind;
1330 case IPV6_RECVORIGDSTADDR:
1331 val = np->rxopt.bits.rxorigdstaddr;
1334 case IPV6_UNICAST_HOPS:
1335 case IPV6_MULTICAST_HOPS:
1337 struct dst_entry *dst;
1339 if (optname == IPV6_UNICAST_HOPS)
1340 val = np->hop_limit;
1342 val = np->mcast_hops;
1346 dst = __sk_dst_get(sk);
1348 val = ip6_dst_hoplimit(dst);
1353 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1357 case IPV6_MULTICAST_LOOP:
1361 case IPV6_MULTICAST_IF:
1362 val = np->mcast_oif;
1365 case IPV6_MULTICAST_ALL:
1369 case IPV6_UNICAST_IF:
1370 val = (__force int)htonl((__u32) np->ucast_oif);
1373 case IPV6_MTU_DISCOVER:
1381 case IPV6_FLOWINFO_SEND:
1385 case IPV6_FLOWLABEL_MGR:
1387 struct in6_flowlabel_req freq;
1390 if (len < sizeof(freq))
1393 if (copy_from_user(&freq, optval, sizeof(freq)))
1396 if (freq.flr_action != IPV6_FL_A_GET)
1400 flags = freq.flr_flags;
1402 memset(&freq, 0, sizeof(freq));
1404 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1408 if (put_user(len, optlen))
1410 if (copy_to_user(optval, &freq, len))
1416 case IPV6_ADDR_PREFERENCES:
1419 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1420 val |= IPV6_PREFER_SRC_TMP;
1421 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1422 val |= IPV6_PREFER_SRC_PUBLIC;
1424 /* XXX: should we return system default? */
1425 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1428 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1429 val |= IPV6_PREFER_SRC_COA;
1431 val |= IPV6_PREFER_SRC_HOME;
1434 case IPV6_MINHOPCOUNT:
1435 val = np->min_hopcount;
1442 case IPV6_AUTOFLOWLABEL:
1443 val = ip6_autoflowlabel(sock_net(sk), np);
1446 case IPV6_RECVFRAGSIZE:
1447 val = np->rxopt.bits.recvfragsize;
1450 case IPV6_ROUTER_ALERT_ISOLATE:
1451 val = np->rtalert_isolate;
1454 case IPV6_RECVERR_RFC4884:
1455 val = np->recverr_rfc4884;
1459 return -ENOPROTOOPT;
1461 len = min_t(unsigned int, sizeof(int), len);
1462 if (put_user(len, optlen))
1464 if (copy_to_user(optval, &val, len))
1469 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1470 char __user *optval, int __user *optlen)
1474 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1475 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1477 if (level != SOL_IPV6)
1478 return -ENOPROTOOPT;
1480 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1481 #ifdef CONFIG_NETFILTER
1482 /* we need to exclude all possible ENOPROTOOPTs except default case */
1483 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1486 if (get_user(len, optlen))
1489 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1491 err = put_user(len, optlen);
1496 EXPORT_SYMBOL(ipv6_getsockopt);