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>
57 #include <linux/uaccess.h>
59 struct ip6_ra_chain *ip6_ra_chain;
60 DEFINE_RWLOCK(ip6_ra_lock);
62 int ip6_ra_control(struct sock *sk, int sel)
64 struct ip6_ra_chain *ra, *new_ra, **rap;
66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
70 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
76 write_unlock_bh(&ip6_ra_lock);
82 write_unlock_bh(&ip6_ra_lock);
90 write_unlock_bh(&ip6_ra_lock);
98 write_unlock_bh(&ip6_ra_lock);
102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
105 if (inet_sk(sk)->is_icsk) {
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
121 static bool setsockopt_needs_rtnl(int optname)
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
142 char __user *optval, unsigned int optlen)
144 struct ipv6_pinfo *np = inet6_sk(sk);
145 struct net *net = sock_net(sk);
147 int retv = -ENOPROTOOPT;
148 bool needs_rtnl = setsockopt_needs_rtnl(optname);
153 if (optlen >= sizeof(int)) {
154 if (get_user(val, (int __user *) optval))
160 valbool = (val != 0);
162 if (ip6_mroute_opt(optname))
163 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
172 if (optlen < sizeof(int))
174 if (val == PF_INET) {
175 struct ipv6_txoptions *opt;
176 struct sk_buff *pktopt;
178 if (sk->sk_type == SOCK_RAW)
181 if (sk->sk_protocol == IPPROTO_UDP ||
182 sk->sk_protocol == IPPROTO_UDPLITE) {
183 struct udp_sock *up = udp_sk(sk);
184 if (up->pending == AF_INET6) {
188 } else if (sk->sk_protocol != IPPROTO_TCP)
191 if (sk->sk_state != TCP_ESTABLISHED) {
196 if (ipv6_only_sock(sk) ||
197 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
198 retv = -EADDRNOTAVAIL;
202 fl6_free_socklist(sk);
203 __ipv6_sock_mc_close(sk);
206 * Sock is moving from IPv6 to IPv4 (sk_prot), so
207 * remove it from the refcnt debug socks count in the
210 sk_refcnt_debug_dec(sk);
212 if (sk->sk_protocol == IPPROTO_TCP) {
213 struct inet_connection_sock *icsk = inet_csk(sk);
215 sock_prot_inuse_add(net, sk->sk_prot, -1);
216 sock_prot_inuse_add(net, &tcp_prot, 1);
218 sk->sk_prot = &tcp_prot;
219 icsk->icsk_af_ops = &ipv4_specific;
220 sk->sk_socket->ops = &inet_stream_ops;
221 sk->sk_family = PF_INET;
222 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
224 struct proto *prot = &udp_prot;
226 if (sk->sk_protocol == IPPROTO_UDPLITE)
227 prot = &udplite_prot;
229 sock_prot_inuse_add(net, sk->sk_prot, -1);
230 sock_prot_inuse_add(net, prot, 1);
233 sk->sk_socket->ops = &inet_dgram_ops;
234 sk->sk_family = PF_INET;
236 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
239 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
242 pktopt = xchg(&np->pktoptions, NULL);
245 sk->sk_destruct = inet_sock_destruct;
247 * ... and add it to the refcnt debug socks count
248 * in the new family. -acme
250 sk_refcnt_debug_inc(sk);
251 module_put(THIS_MODULE);
258 if (optlen < sizeof(int) ||
259 inet_sk(sk)->inet_num)
261 sk->sk_ipv6only = valbool;
265 case IPV6_RECVPKTINFO:
266 if (optlen < sizeof(int))
268 np->rxopt.bits.rxinfo = valbool;
272 case IPV6_2292PKTINFO:
273 if (optlen < sizeof(int))
275 np->rxopt.bits.rxoinfo = valbool;
279 case IPV6_RECVHOPLIMIT:
280 if (optlen < sizeof(int))
282 np->rxopt.bits.rxhlim = valbool;
286 case IPV6_2292HOPLIMIT:
287 if (optlen < sizeof(int))
289 np->rxopt.bits.rxohlim = valbool;
294 if (optlen < sizeof(int))
296 np->rxopt.bits.srcrt = valbool;
301 if (optlen < sizeof(int))
303 np->rxopt.bits.osrcrt = valbool;
307 case IPV6_RECVHOPOPTS:
308 if (optlen < sizeof(int))
310 np->rxopt.bits.hopopts = valbool;
314 case IPV6_2292HOPOPTS:
315 if (optlen < sizeof(int))
317 np->rxopt.bits.ohopopts = valbool;
321 case IPV6_RECVDSTOPTS:
322 if (optlen < sizeof(int))
324 np->rxopt.bits.dstopts = valbool;
328 case IPV6_2292DSTOPTS:
329 if (optlen < sizeof(int))
331 np->rxopt.bits.odstopts = valbool;
336 if (optlen < sizeof(int))
338 if (val < -1 || val > 0xff)
340 /* RFC 3542, 6.5: default traffic class of 0x0 */
347 case IPV6_RECVTCLASS:
348 if (optlen < sizeof(int))
350 np->rxopt.bits.rxtclass = valbool;
355 if (optlen < sizeof(int))
357 np->rxopt.bits.rxflow = valbool;
361 case IPV6_RECVPATHMTU:
362 if (optlen < sizeof(int))
364 np->rxopt.bits.rxpmtu = valbool;
368 case IPV6_TRANSPARENT:
369 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
370 !ns_capable(net->user_ns, CAP_NET_RAW)) {
374 if (optlen < sizeof(int))
376 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
377 inet_sk(sk)->transparent = valbool;
381 case IPV6_RECVORIGDSTADDR:
382 if (optlen < sizeof(int))
384 np->rxopt.bits.rxorigdstaddr = valbool;
389 case IPV6_RTHDRDSTOPTS:
393 struct ipv6_txoptions *opt;
395 /* remove any sticky options header with a zero option
396 * length, per RFC3542.
402 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
403 optlen & 0x7 || optlen > 8 * 255)
406 /* hop-by-hop / destination options are privileged option */
408 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
411 opt = rcu_dereference_protected(np->opt,
412 lockdep_sock_is_held(sk));
413 opt = ipv6_renew_options(sk, opt, optname,
414 (struct ipv6_opt_hdr __user *)optval,
421 /* routing header option needs extra check */
423 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
424 struct ipv6_rt_hdr *rthdr = opt->srcrt;
425 switch (rthdr->type) {
426 #if IS_ENABLED(CONFIG_IPV6_MIP6)
427 case IPV6_SRCRT_TYPE_2:
428 if (rthdr->hdrlen != 2 ||
429 rthdr->segments_left != 1)
434 case IPV6_SRCRT_TYPE_4:
436 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
439 if (!seg6_validate_srh(srh, optlen))
449 opt = ipv6_update_options(sk, opt);
452 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
460 struct in6_pktinfo pkt;
464 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
467 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
471 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
474 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
475 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
480 case IPV6_2292PKTOPTIONS:
482 struct ipv6_txoptions *opt = NULL;
485 struct sockcm_cookie sockc_junk;
486 struct ipcm6_cookie ipc6;
488 memset(&fl6, 0, sizeof(fl6));
489 fl6.flowi6_oif = sk->sk_bound_dev_if;
490 fl6.flowi6_mark = sk->sk_mark;
495 /* 1K is probably excessive
496 * 1K is surely not enough, 2K per standard header is 16K.
499 if (optlen > 64*1024)
502 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
507 memset(opt, 0, sizeof(*opt));
508 refcount_set(&opt->refcnt, 1);
509 opt->tot_len = sizeof(*opt) + optlen;
511 if (copy_from_user(opt+1, optval, optlen))
514 msg.msg_controllen = optlen;
515 msg.msg_control = (void *)(opt+1);
518 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
523 opt = ipv6_update_options(sk, opt);
526 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
531 case IPV6_UNICAST_HOPS:
532 if (optlen < sizeof(int))
534 if (val > 255 || val < -1)
540 case IPV6_MULTICAST_HOPS:
541 if (sk->sk_type == SOCK_STREAM)
543 if (optlen < sizeof(int))
545 if (val > 255 || val < -1)
547 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
551 case IPV6_MULTICAST_LOOP:
552 if (optlen < sizeof(int))
556 np->mc_loop = valbool;
560 case IPV6_UNICAST_IF:
562 struct net_device *dev = NULL;
565 if (optlen != sizeof(int))
568 ifindex = (__force int)ntohl((__force __be32)val);
575 dev = dev_get_by_index(net, ifindex);
576 retv = -EADDRNOTAVAIL;
582 if (sk->sk_bound_dev_if)
585 np->ucast_oif = ifindex;
590 case IPV6_MULTICAST_IF:
591 if (sk->sk_type == SOCK_STREAM)
593 if (optlen < sizeof(int))
597 struct net_device *dev;
602 dev = dev_get_by_index_rcu(net, val);
608 midx = l3mdev_master_ifindex_rcu(dev);
612 if (sk->sk_bound_dev_if &&
613 sk->sk_bound_dev_if != val &&
614 (!midx || midx != sk->sk_bound_dev_if))
620 case IPV6_ADD_MEMBERSHIP:
621 case IPV6_DROP_MEMBERSHIP:
623 struct ipv6_mreq mreq;
625 if (optlen < sizeof(struct ipv6_mreq))
629 if (inet_sk(sk)->is_icsk)
633 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
636 if (optname == IPV6_ADD_MEMBERSHIP)
637 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
639 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
642 case IPV6_JOIN_ANYCAST:
643 case IPV6_LEAVE_ANYCAST:
645 struct ipv6_mreq mreq;
647 if (optlen < sizeof(struct ipv6_mreq))
651 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
654 if (optname == IPV6_JOIN_ANYCAST)
655 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
657 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
660 case MCAST_JOIN_GROUP:
661 case MCAST_LEAVE_GROUP:
663 struct group_req greq;
664 struct sockaddr_in6 *psin6;
666 if (optlen < sizeof(struct group_req))
670 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
672 if (greq.gr_group.ss_family != AF_INET6) {
673 retv = -EADDRNOTAVAIL;
676 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
677 if (optname == MCAST_JOIN_GROUP)
678 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
681 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
685 case MCAST_JOIN_SOURCE_GROUP:
686 case MCAST_LEAVE_SOURCE_GROUP:
687 case MCAST_BLOCK_SOURCE:
688 case MCAST_UNBLOCK_SOURCE:
690 struct group_source_req greqs;
693 if (optlen < sizeof(struct group_source_req))
695 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
699 if (greqs.gsr_group.ss_family != AF_INET6 ||
700 greqs.gsr_source.ss_family != AF_INET6) {
701 retv = -EADDRNOTAVAIL;
704 if (optname == MCAST_BLOCK_SOURCE) {
705 omode = MCAST_EXCLUDE;
707 } else if (optname == MCAST_UNBLOCK_SOURCE) {
708 omode = MCAST_EXCLUDE;
710 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
711 struct sockaddr_in6 *psin6;
713 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
714 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
716 /* prior join w/ different source is ok */
717 if (retv && retv != -EADDRINUSE)
719 omode = MCAST_INCLUDE;
721 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
722 omode = MCAST_INCLUDE;
725 retv = ip6_mc_source(add, omode, sk, &greqs);
730 struct group_filter *gsf;
732 if (optlen < GROUP_FILTER_SIZE(0))
734 if (optlen > sysctl_optmem_max) {
738 gsf = memdup_user(optval, optlen);
743 /* numsrc >= (4G-140)/128 overflow in 32 bits */
744 if (gsf->gf_numsrc >= 0x1ffffffU ||
745 gsf->gf_numsrc > sysctl_mld_max_msf) {
750 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
755 retv = ip6_mc_msfilter(sk, gsf);
760 case IPV6_ROUTER_ALERT:
761 if (optlen < sizeof(int))
763 retv = ip6_ra_control(sk, val);
765 case IPV6_MTU_DISCOVER:
766 if (optlen < sizeof(int))
768 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
774 if (optlen < sizeof(int))
776 if (val && val < IPV6_MIN_MTU)
782 if (optlen < sizeof(int))
784 np->recverr = valbool;
786 skb_queue_purge(&sk->sk_error_queue);
789 case IPV6_FLOWINFO_SEND:
790 if (optlen < sizeof(int))
792 np->sndflow = valbool;
795 case IPV6_FLOWLABEL_MGR:
796 retv = ipv6_flowlabel_opt(sk, optval, optlen);
798 case IPV6_IPSEC_POLICY:
799 case IPV6_XFRM_POLICY:
801 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
803 retv = xfrm_user_policy(sk, optname, optval, optlen);
806 case IPV6_ADDR_PREFERENCES:
808 unsigned int pref = 0;
809 unsigned int prefmask = ~0;
811 if (optlen < sizeof(int))
816 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
817 switch (val & (IPV6_PREFER_SRC_PUBLIC|
819 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
820 case IPV6_PREFER_SRC_PUBLIC:
821 pref |= IPV6_PREFER_SRC_PUBLIC;
823 case IPV6_PREFER_SRC_TMP:
824 pref |= IPV6_PREFER_SRC_TMP;
826 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
829 goto pref_skip_pubtmp;
834 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
835 IPV6_PREFER_SRC_TMP);
838 /* check HOME/COA conflicts */
839 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
840 case IPV6_PREFER_SRC_HOME:
842 case IPV6_PREFER_SRC_COA:
843 pref |= IPV6_PREFER_SRC_COA;
850 prefmask &= ~IPV6_PREFER_SRC_COA;
853 /* check CGA/NONCGA conflicts */
854 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
855 case IPV6_PREFER_SRC_CGA:
856 case IPV6_PREFER_SRC_NONCGA:
863 np->srcprefs = (np->srcprefs & prefmask) | pref;
868 case IPV6_MINHOPCOUNT:
869 if (optlen < sizeof(int))
871 if (val < 0 || val > 255)
873 np->min_hopcount = val;
877 np->dontfrag = valbool;
880 case IPV6_AUTOFLOWLABEL:
881 np->autoflowlabel = valbool;
884 case IPV6_RECVFRAGSIZE:
885 np->rxopt.bits.recvfragsize = valbool;
903 int ipv6_setsockopt(struct sock *sk, int level, int optname,
904 char __user *optval, unsigned int optlen)
908 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
909 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
911 if (level != SOL_IPV6)
914 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
915 #ifdef CONFIG_NETFILTER
916 /* we need to exclude all possible ENOPROTOOPTs except default case */
917 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
918 optname != IPV6_XFRM_POLICY) {
920 err = nf_setsockopt(sk, PF_INET6, optname, optval,
927 EXPORT_SYMBOL(ipv6_setsockopt);
930 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
931 char __user *optval, unsigned int optlen)
935 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
936 if (udp_prot.compat_setsockopt != NULL)
937 return udp_prot.compat_setsockopt(sk, level, optname,
939 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
942 if (level != SOL_IPV6)
945 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
946 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
949 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
950 #ifdef CONFIG_NETFILTER
951 /* we need to exclude all possible ENOPROTOOPTs except default case */
952 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
953 optname != IPV6_XFRM_POLICY) {
955 err = compat_nf_setsockopt(sk, PF_INET6, optname,
962 EXPORT_SYMBOL(compat_ipv6_setsockopt);
965 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
966 int optname, char __user *optval, int len)
968 struct ipv6_opt_hdr *hdr;
977 case IPV6_RTHDRDSTOPTS:
981 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
987 return -EINVAL; /* should not happen */
993 len = min_t(unsigned int, len, ipv6_optlen(hdr));
994 if (copy_to_user(optval, hdr, len))
999 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1000 char __user *optval, int __user *optlen, unsigned int flags)
1002 struct ipv6_pinfo *np = inet6_sk(sk);
1006 if (ip6_mroute_opt(optname))
1007 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1009 if (get_user(len, optlen))
1013 if (sk->sk_protocol != IPPROTO_UDP &&
1014 sk->sk_protocol != IPPROTO_UDPLITE &&
1015 sk->sk_protocol != IPPROTO_TCP)
1016 return -ENOPROTOOPT;
1017 if (sk->sk_state != TCP_ESTABLISHED)
1019 val = sk->sk_family;
1021 case MCAST_MSFILTER:
1023 struct group_filter gsf;
1026 if (len < GROUP_FILTER_SIZE(0))
1028 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1030 if (gsf.gf_group.ss_family != AF_INET6)
1031 return -EADDRNOTAVAIL;
1033 err = ip6_mc_msfget(sk, &gsf,
1034 (struct group_filter __user *)optval, optlen);
1039 case IPV6_2292PKTOPTIONS:
1042 struct sk_buff *skb;
1044 if (sk->sk_type != SOCK_STREAM)
1045 return -ENOPROTOOPT;
1047 msg.msg_control = optval;
1048 msg.msg_controllen = len;
1049 msg.msg_flags = flags;
1052 skb = np->pktoptions;
1054 ip6_datagram_recv_ctl(sk, &msg, skb);
1057 if (np->rxopt.bits.rxinfo) {
1058 struct in6_pktinfo src_info;
1059 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1060 np->sticky_pktinfo.ipi6_ifindex;
1061 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1062 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1064 if (np->rxopt.bits.rxhlim) {
1065 int hlim = np->mcast_hops;
1066 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1068 if (np->rxopt.bits.rxtclass) {
1069 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1071 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1073 if (np->rxopt.bits.rxoinfo) {
1074 struct in6_pktinfo src_info;
1075 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1076 np->sticky_pktinfo.ipi6_ifindex;
1077 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1078 np->sticky_pktinfo.ipi6_addr;
1079 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1081 if (np->rxopt.bits.rxohlim) {
1082 int hlim = np->mcast_hops;
1083 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1085 if (np->rxopt.bits.rxflow) {
1086 __be32 flowinfo = np->rcv_flowinfo;
1088 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1091 len -= msg.msg_controllen;
1092 return put_user(len, optlen);
1096 struct dst_entry *dst;
1100 dst = __sk_dst_get(sk);
1110 val = sk->sk_ipv6only;
1113 case IPV6_RECVPKTINFO:
1114 val = np->rxopt.bits.rxinfo;
1117 case IPV6_2292PKTINFO:
1118 val = np->rxopt.bits.rxoinfo;
1121 case IPV6_RECVHOPLIMIT:
1122 val = np->rxopt.bits.rxhlim;
1125 case IPV6_2292HOPLIMIT:
1126 val = np->rxopt.bits.rxohlim;
1129 case IPV6_RECVRTHDR:
1130 val = np->rxopt.bits.srcrt;
1133 case IPV6_2292RTHDR:
1134 val = np->rxopt.bits.osrcrt;
1138 case IPV6_RTHDRDSTOPTS:
1142 struct ipv6_txoptions *opt;
1145 opt = rcu_dereference_protected(np->opt,
1146 lockdep_sock_is_held(sk));
1147 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1149 /* check if ipv6_getsockopt_sticky() returns err code */
1152 return put_user(len, optlen);
1155 case IPV6_RECVHOPOPTS:
1156 val = np->rxopt.bits.hopopts;
1159 case IPV6_2292HOPOPTS:
1160 val = np->rxopt.bits.ohopopts;
1163 case IPV6_RECVDSTOPTS:
1164 val = np->rxopt.bits.dstopts;
1167 case IPV6_2292DSTOPTS:
1168 val = np->rxopt.bits.odstopts;
1175 case IPV6_RECVTCLASS:
1176 val = np->rxopt.bits.rxtclass;
1180 val = np->rxopt.bits.rxflow;
1183 case IPV6_RECVPATHMTU:
1184 val = np->rxopt.bits.rxpmtu;
1189 struct dst_entry *dst;
1190 struct ip6_mtuinfo mtuinfo;
1192 if (len < sizeof(mtuinfo))
1195 len = sizeof(mtuinfo);
1196 memset(&mtuinfo, 0, sizeof(mtuinfo));
1199 dst = __sk_dst_get(sk);
1201 mtuinfo.ip6m_mtu = dst_mtu(dst);
1203 if (!mtuinfo.ip6m_mtu)
1206 if (put_user(len, optlen))
1208 if (copy_to_user(optval, &mtuinfo, len))
1214 case IPV6_TRANSPARENT:
1215 val = inet_sk(sk)->transparent;
1218 case IPV6_RECVORIGDSTADDR:
1219 val = np->rxopt.bits.rxorigdstaddr;
1222 case IPV6_UNICAST_HOPS:
1223 case IPV6_MULTICAST_HOPS:
1225 struct dst_entry *dst;
1227 if (optname == IPV6_UNICAST_HOPS)
1228 val = np->hop_limit;
1230 val = np->mcast_hops;
1234 dst = __sk_dst_get(sk);
1236 val = ip6_dst_hoplimit(dst);
1241 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1245 case IPV6_MULTICAST_LOOP:
1249 case IPV6_MULTICAST_IF:
1250 val = np->mcast_oif;
1253 case IPV6_UNICAST_IF:
1254 val = (__force int)htonl((__u32) np->ucast_oif);
1257 case IPV6_MTU_DISCOVER:
1265 case IPV6_FLOWINFO_SEND:
1269 case IPV6_FLOWLABEL_MGR:
1271 struct in6_flowlabel_req freq;
1274 if (len < sizeof(freq))
1277 if (copy_from_user(&freq, optval, sizeof(freq)))
1280 if (freq.flr_action != IPV6_FL_A_GET)
1284 flags = freq.flr_flags;
1286 memset(&freq, 0, sizeof(freq));
1288 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1292 if (put_user(len, optlen))
1294 if (copy_to_user(optval, &freq, len))
1300 case IPV6_ADDR_PREFERENCES:
1303 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1304 val |= IPV6_PREFER_SRC_TMP;
1305 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1306 val |= IPV6_PREFER_SRC_PUBLIC;
1308 /* XXX: should we return system default? */
1309 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1312 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1313 val |= IPV6_PREFER_SRC_COA;
1315 val |= IPV6_PREFER_SRC_HOME;
1318 case IPV6_MINHOPCOUNT:
1319 val = np->min_hopcount;
1326 case IPV6_AUTOFLOWLABEL:
1327 val = np->autoflowlabel;
1330 case IPV6_RECVFRAGSIZE:
1331 val = np->rxopt.bits.recvfragsize;
1335 return -ENOPROTOOPT;
1337 len = min_t(unsigned int, sizeof(int), len);
1338 if (put_user(len, optlen))
1340 if (copy_to_user(optval, &val, len))
1345 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1346 char __user *optval, int __user *optlen)
1350 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1351 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1353 if (level != SOL_IPV6)
1354 return -ENOPROTOOPT;
1356 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1357 #ifdef CONFIG_NETFILTER
1358 /* we need to exclude all possible ENOPROTOOPTs except default case */
1359 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1362 if (get_user(len, optlen))
1366 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1370 err = put_user(len, optlen);
1375 EXPORT_SYMBOL(ipv6_getsockopt);
1377 #ifdef CONFIG_COMPAT
1378 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1379 char __user *optval, int __user *optlen)
1383 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1384 if (udp_prot.compat_getsockopt != NULL)
1385 return udp_prot.compat_getsockopt(sk, level, optname,
1387 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1390 if (level != SOL_IPV6)
1391 return -ENOPROTOOPT;
1393 if (optname == MCAST_MSFILTER)
1394 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1397 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1399 #ifdef CONFIG_NETFILTER
1400 /* we need to exclude all possible ENOPROTOOPTs except default case */
1401 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1404 if (get_user(len, optlen))
1408 err = compat_nf_getsockopt(sk, PF_INET6,
1409 optname, optval, &len);
1412 err = put_user(len, optlen);
1417 EXPORT_SYMBOL(compat_ipv6_getsockopt);