2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/net/ipv4/ip_sockglue.c
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
15 * FIXME: Make the setsockopt code POSIX compliant: That is
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/mroute6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
39 #include <linux/slab.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/transp_v6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/inet_common.h>
52 #include <net/udplite.h>
54 #include <net/compat.h>
56 #include <asm/uaccess.h>
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
61 int ip6_ra_control(struct sock *sk, int sel)
63 struct ip6_ra_chain *ra, *new_ra, **rap;
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
69 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
75 write_unlock_bh(&ip6_ra_lock);
81 write_unlock_bh(&ip6_ra_lock);
89 write_unlock_bh(&ip6_ra_lock);
97 write_unlock_bh(&ip6_ra_lock);
102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
105 if (inet_sk(sk)->is_icsk) {
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
113 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
116 spin_lock(&sk->sk_dst_lock);
117 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
119 spin_unlock(&sk->sk_dst_lock);
126 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
127 char __user *optval, unsigned int optlen)
129 struct ipv6_pinfo *np = inet6_sk(sk);
130 struct net *net = sock_net(sk);
132 int retv = -ENOPROTOOPT;
137 if (optlen >= sizeof(int)) {
138 if (get_user(val, (int __user *) optval))
146 if (ip6_mroute_opt(optname))
147 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
154 if (optlen < sizeof(int))
156 if (val == PF_INET) {
157 struct ipv6_txoptions *opt;
158 struct sk_buff *pktopt;
160 if (sk->sk_type == SOCK_RAW)
163 if (sk->sk_protocol == IPPROTO_UDP ||
164 sk->sk_protocol == IPPROTO_UDPLITE) {
165 struct udp_sock *up = udp_sk(sk);
166 if (up->pending == AF_INET6) {
170 } else if (sk->sk_protocol != IPPROTO_TCP)
173 if (sk->sk_state != TCP_ESTABLISHED) {
178 if (ipv6_only_sock(sk) ||
179 !ipv6_addr_v4mapped(&np->daddr)) {
180 retv = -EADDRNOTAVAIL;
184 fl6_free_socklist(sk);
185 ipv6_sock_mc_close(sk);
188 * Sock is moving from IPv6 to IPv4 (sk_prot), so
189 * remove it from the refcnt debug socks count in the
192 sk_refcnt_debug_dec(sk);
194 if (sk->sk_protocol == IPPROTO_TCP) {
195 struct inet_connection_sock *icsk = inet_csk(sk);
197 sock_prot_inuse_add(net, sk->sk_prot, -1);
198 sock_prot_inuse_add(net, &tcp_prot, 1);
200 sk->sk_prot = &tcp_prot;
201 icsk->icsk_af_ops = &ipv4_specific;
202 sk->sk_socket->ops = &inet_stream_ops;
203 sk->sk_family = PF_INET;
204 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
206 struct proto *prot = &udp_prot;
208 if (sk->sk_protocol == IPPROTO_UDPLITE)
209 prot = &udplite_prot;
211 sock_prot_inuse_add(net, sk->sk_prot, -1);
212 sock_prot_inuse_add(net, prot, 1);
215 sk->sk_socket->ops = &inet_dgram_ops;
216 sk->sk_family = PF_INET;
218 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
221 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
224 pktopt = xchg(&np->pktoptions, NULL);
227 sk->sk_destruct = inet_sock_destruct;
229 * ... and add it to the refcnt debug socks count
230 * in the new family. -acme
232 sk_refcnt_debug_inc(sk);
233 module_put(THIS_MODULE);
240 if (optlen < sizeof(int) ||
241 inet_sk(sk)->inet_num)
243 np->ipv6only = valbool;
247 case IPV6_RECVPKTINFO:
248 if (optlen < sizeof(int))
250 np->rxopt.bits.rxinfo = valbool;
254 case IPV6_2292PKTINFO:
255 if (optlen < sizeof(int))
257 np->rxopt.bits.rxoinfo = valbool;
261 case IPV6_RECVHOPLIMIT:
262 if (optlen < sizeof(int))
264 np->rxopt.bits.rxhlim = valbool;
268 case IPV6_2292HOPLIMIT:
269 if (optlen < sizeof(int))
271 np->rxopt.bits.rxohlim = valbool;
276 if (optlen < sizeof(int))
278 np->rxopt.bits.srcrt = valbool;
283 if (optlen < sizeof(int))
285 np->rxopt.bits.osrcrt = valbool;
289 case IPV6_RECVHOPOPTS:
290 if (optlen < sizeof(int))
292 np->rxopt.bits.hopopts = valbool;
296 case IPV6_2292HOPOPTS:
297 if (optlen < sizeof(int))
299 np->rxopt.bits.ohopopts = valbool;
303 case IPV6_RECVDSTOPTS:
304 if (optlen < sizeof(int))
306 np->rxopt.bits.dstopts = valbool;
310 case IPV6_2292DSTOPTS:
311 if (optlen < sizeof(int))
313 np->rxopt.bits.odstopts = valbool;
318 if (optlen < sizeof(int))
320 if (val < -1 || val > 0xff)
322 /* RFC 3542, 6.5: default traffic class of 0x0 */
329 case IPV6_RECVTCLASS:
330 if (optlen < sizeof(int))
332 np->rxopt.bits.rxtclass = valbool;
337 if (optlen < sizeof(int))
339 np->rxopt.bits.rxflow = valbool;
343 case IPV6_RECVPATHMTU:
344 if (optlen < sizeof(int))
346 np->rxopt.bits.rxpmtu = valbool;
350 case IPV6_TRANSPARENT:
351 if (valbool && !capable(CAP_NET_ADMIN) && !capable(CAP_NET_RAW)) {
355 if (optlen < sizeof(int))
357 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
358 inet_sk(sk)->transparent = valbool;
362 case IPV6_RECVORIGDSTADDR:
363 if (optlen < sizeof(int))
365 np->rxopt.bits.rxorigdstaddr = valbool;
370 case IPV6_RTHDRDSTOPTS:
374 struct ipv6_txoptions *opt;
376 /* remove any sticky options header with a zero option
377 * length, per RFC3542.
381 else if (optval == NULL)
383 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
384 optlen & 0x7 || optlen > 8 * 255)
387 /* hop-by-hop / destination options are privileged option */
389 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
392 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
393 opt = ipv6_renew_options(sk, opt, optname,
394 (struct ipv6_opt_hdr __user *)optval,
401 /* routing header option needs extra check */
403 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
404 struct ipv6_rt_hdr *rthdr = opt->srcrt;
405 switch (rthdr->type) {
406 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
407 case IPV6_SRCRT_TYPE_2:
408 if (rthdr->hdrlen != 2 ||
409 rthdr->segments_left != 1)
420 opt = ipv6_update_options(sk, opt);
423 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
431 struct in6_pktinfo pkt;
435 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
438 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
442 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
445 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
446 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
451 case IPV6_2292PKTOPTIONS:
453 struct ipv6_txoptions *opt = NULL;
458 memset(&fl6, 0, sizeof(fl6));
459 fl6.flowi6_oif = sk->sk_bound_dev_if;
460 fl6.flowi6_mark = sk->sk_mark;
465 /* 1K is probably excessive
466 * 1K is surely not enough, 2K per standard header is 16K.
469 if (optlen > 64*1024)
472 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
477 memset(opt, 0, sizeof(*opt));
478 atomic_set(&opt->refcnt, 1);
479 opt->tot_len = sizeof(*opt) + optlen;
481 if (copy_from_user(opt+1, optval, optlen))
484 msg.msg_controllen = optlen;
485 msg.msg_control = (void*)(opt+1);
487 retv = datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk, &junk,
493 opt = ipv6_update_options(sk, opt);
496 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
501 case IPV6_UNICAST_HOPS:
502 if (optlen < sizeof(int))
504 if (val > 255 || val < -1)
510 case IPV6_MULTICAST_HOPS:
511 if (sk->sk_type == SOCK_STREAM)
513 if (optlen < sizeof(int))
515 if (val > 255 || val < -1)
517 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
521 case IPV6_MULTICAST_LOOP:
522 if (optlen < sizeof(int))
526 np->mc_loop = valbool;
530 case IPV6_MULTICAST_IF:
531 if (sk->sk_type == SOCK_STREAM)
533 if (optlen < sizeof(int))
537 struct net_device *dev;
539 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
542 dev = dev_get_by_index(net, val);
552 case IPV6_ADD_MEMBERSHIP:
553 case IPV6_DROP_MEMBERSHIP:
555 struct ipv6_mreq mreq;
557 if (optlen < sizeof(struct ipv6_mreq))
561 if (inet_sk(sk)->is_icsk)
565 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
568 if (optname == IPV6_ADD_MEMBERSHIP)
569 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
571 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
574 case IPV6_JOIN_ANYCAST:
575 case IPV6_LEAVE_ANYCAST:
577 struct ipv6_mreq mreq;
579 if (optlen < sizeof(struct ipv6_mreq))
583 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
586 if (optname == IPV6_JOIN_ANYCAST)
587 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
589 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
592 case MCAST_JOIN_GROUP:
593 case MCAST_LEAVE_GROUP:
595 struct group_req greq;
596 struct sockaddr_in6 *psin6;
598 if (optlen < sizeof(struct group_req))
602 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
604 if (greq.gr_group.ss_family != AF_INET6) {
605 retv = -EADDRNOTAVAIL;
608 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
609 if (optname == MCAST_JOIN_GROUP)
610 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
613 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
617 case MCAST_JOIN_SOURCE_GROUP:
618 case MCAST_LEAVE_SOURCE_GROUP:
619 case MCAST_BLOCK_SOURCE:
620 case MCAST_UNBLOCK_SOURCE:
622 struct group_source_req greqs;
625 if (optlen < sizeof(struct group_source_req))
627 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
631 if (greqs.gsr_group.ss_family != AF_INET6 ||
632 greqs.gsr_source.ss_family != AF_INET6) {
633 retv = -EADDRNOTAVAIL;
636 if (optname == MCAST_BLOCK_SOURCE) {
637 omode = MCAST_EXCLUDE;
639 } else if (optname == MCAST_UNBLOCK_SOURCE) {
640 omode = MCAST_EXCLUDE;
642 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
643 struct sockaddr_in6 *psin6;
645 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
646 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
648 /* prior join w/ different source is ok */
649 if (retv && retv != -EADDRINUSE)
651 omode = MCAST_INCLUDE;
653 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
654 omode = MCAST_INCLUDE;
657 retv = ip6_mc_source(add, omode, sk, &greqs);
662 extern int sysctl_mld_max_msf;
663 struct group_filter *gsf;
665 if (optlen < GROUP_FILTER_SIZE(0))
667 if (optlen > sysctl_optmem_max) {
671 gsf = kmalloc(optlen,GFP_KERNEL);
677 if (copy_from_user(gsf, optval, optlen)) {
681 /* numsrc >= (4G-140)/128 overflow in 32 bits */
682 if (gsf->gf_numsrc >= 0x1ffffffU ||
683 gsf->gf_numsrc > sysctl_mld_max_msf) {
688 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
693 retv = ip6_mc_msfilter(sk, gsf);
698 case IPV6_ROUTER_ALERT:
699 if (optlen < sizeof(int))
701 retv = ip6_ra_control(sk, val);
703 case IPV6_MTU_DISCOVER:
704 if (optlen < sizeof(int))
706 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
712 if (optlen < sizeof(int))
714 if (val && val < IPV6_MIN_MTU)
720 if (optlen < sizeof(int))
722 np->recverr = valbool;
724 skb_queue_purge(&sk->sk_error_queue);
727 case IPV6_FLOWINFO_SEND:
728 if (optlen < sizeof(int))
730 np->sndflow = valbool;
733 case IPV6_FLOWLABEL_MGR:
734 retv = ipv6_flowlabel_opt(sk, optval, optlen);
736 case IPV6_IPSEC_POLICY:
737 case IPV6_XFRM_POLICY:
739 if (!capable(CAP_NET_ADMIN))
741 retv = xfrm_user_policy(sk, optname, optval, optlen);
744 case IPV6_ADDR_PREFERENCES:
746 unsigned int pref = 0;
747 unsigned int prefmask = ~0;
749 if (optlen < sizeof(int))
754 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
755 switch (val & (IPV6_PREFER_SRC_PUBLIC|
757 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
758 case IPV6_PREFER_SRC_PUBLIC:
759 pref |= IPV6_PREFER_SRC_PUBLIC;
761 case IPV6_PREFER_SRC_TMP:
762 pref |= IPV6_PREFER_SRC_TMP;
764 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
767 goto pref_skip_pubtmp;
772 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
773 IPV6_PREFER_SRC_TMP);
776 /* check HOME/COA conflicts */
777 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
778 case IPV6_PREFER_SRC_HOME:
780 case IPV6_PREFER_SRC_COA:
781 pref |= IPV6_PREFER_SRC_COA;
788 prefmask &= ~IPV6_PREFER_SRC_COA;
791 /* check CGA/NONCGA conflicts */
792 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
793 case IPV6_PREFER_SRC_CGA:
794 case IPV6_PREFER_SRC_NONCGA:
801 np->srcprefs = (np->srcprefs & prefmask) | pref;
806 case IPV6_MINHOPCOUNT:
807 if (optlen < sizeof(int))
809 if (val < 0 || val > 255)
811 np->min_hopcount = val;
815 np->dontfrag = valbool;
829 int ipv6_setsockopt(struct sock *sk, int level, int optname,
830 char __user *optval, unsigned int optlen)
834 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
835 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
837 if (level != SOL_IPV6)
840 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
841 #ifdef CONFIG_NETFILTER
842 /* we need to exclude all possible ENOPROTOOPTs except default case */
843 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
844 optname != IPV6_XFRM_POLICY) {
846 err = nf_setsockopt(sk, PF_INET6, optname, optval,
854 EXPORT_SYMBOL(ipv6_setsockopt);
857 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
858 char __user *optval, unsigned int optlen)
862 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
863 if (udp_prot.compat_setsockopt != NULL)
864 return udp_prot.compat_setsockopt(sk, level, optname,
866 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
869 if (level != SOL_IPV6)
872 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
873 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
876 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
877 #ifdef CONFIG_NETFILTER
878 /* we need to exclude all possible ENOPROTOOPTs except default case */
879 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
880 optname != IPV6_XFRM_POLICY) {
882 err = compat_nf_setsockopt(sk, PF_INET6, optname,
890 EXPORT_SYMBOL(compat_ipv6_setsockopt);
893 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
894 int optname, char __user *optval, int len)
896 struct ipv6_opt_hdr *hdr;
905 case IPV6_RTHDRDSTOPTS:
909 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
915 return -EINVAL; /* should not happen */
921 len = min_t(unsigned int, len, ipv6_optlen(hdr));
922 if (copy_to_user(optval, hdr, len))
927 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
928 char __user *optval, int __user *optlen, unsigned flags)
930 struct ipv6_pinfo *np = inet6_sk(sk);
934 if (ip6_mroute_opt(optname))
935 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
937 if (get_user(len, optlen))
941 if (sk->sk_protocol != IPPROTO_UDP &&
942 sk->sk_protocol != IPPROTO_UDPLITE &&
943 sk->sk_protocol != IPPROTO_TCP)
945 if (sk->sk_state != TCP_ESTABLISHED)
951 struct group_filter gsf;
954 if (len < GROUP_FILTER_SIZE(0))
956 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
958 if (gsf.gf_group.ss_family != AF_INET6)
959 return -EADDRNOTAVAIL;
961 err = ip6_mc_msfget(sk, &gsf,
962 (struct group_filter __user *)optval, optlen);
967 case IPV6_2292PKTOPTIONS:
972 if (sk->sk_type != SOCK_STREAM)
975 msg.msg_control = optval;
976 msg.msg_controllen = len;
977 msg.msg_flags = flags;
980 skb = np->pktoptions;
982 atomic_inc(&skb->users);
986 int err = datagram_recv_ctl(sk, &msg, skb);
991 if (np->rxopt.bits.rxinfo) {
992 struct in6_pktinfo src_info;
993 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
994 np->sticky_pktinfo.ipi6_ifindex;
995 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
996 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
997 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
999 if (np->rxopt.bits.rxhlim) {
1000 int hlim = np->mcast_hops;
1001 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1003 if (np->rxopt.bits.rxoinfo) {
1004 struct in6_pktinfo src_info;
1005 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1006 np->sticky_pktinfo.ipi6_ifindex;
1007 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
1008 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
1009 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1011 if (np->rxopt.bits.rxohlim) {
1012 int hlim = np->mcast_hops;
1013 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1016 len -= msg.msg_controllen;
1017 return put_user(len, optlen);
1021 struct dst_entry *dst;
1025 dst = __sk_dst_get(sk);
1038 case IPV6_RECVPKTINFO:
1039 val = np->rxopt.bits.rxinfo;
1042 case IPV6_2292PKTINFO:
1043 val = np->rxopt.bits.rxoinfo;
1046 case IPV6_RECVHOPLIMIT:
1047 val = np->rxopt.bits.rxhlim;
1050 case IPV6_2292HOPLIMIT:
1051 val = np->rxopt.bits.rxohlim;
1054 case IPV6_RECVRTHDR:
1055 val = np->rxopt.bits.srcrt;
1058 case IPV6_2292RTHDR:
1059 val = np->rxopt.bits.osrcrt;
1063 case IPV6_RTHDRDSTOPTS:
1067 struct ipv6_txoptions *opt;
1070 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1071 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1073 /* check if ipv6_getsockopt_sticky() returns err code */
1076 return put_user(len, optlen);
1079 case IPV6_RECVHOPOPTS:
1080 val = np->rxopt.bits.hopopts;
1083 case IPV6_2292HOPOPTS:
1084 val = np->rxopt.bits.ohopopts;
1087 case IPV6_RECVDSTOPTS:
1088 val = np->rxopt.bits.dstopts;
1091 case IPV6_2292DSTOPTS:
1092 val = np->rxopt.bits.odstopts;
1099 case IPV6_RECVTCLASS:
1100 val = np->rxopt.bits.rxtclass;
1104 val = np->rxopt.bits.rxflow;
1107 case IPV6_RECVPATHMTU:
1108 val = np->rxopt.bits.rxpmtu;
1113 struct dst_entry *dst;
1114 struct ip6_mtuinfo mtuinfo;
1116 if (len < sizeof(mtuinfo))
1119 len = sizeof(mtuinfo);
1120 memset(&mtuinfo, 0, sizeof(mtuinfo));
1123 dst = __sk_dst_get(sk);
1125 mtuinfo.ip6m_mtu = dst_mtu(dst);
1127 if (!mtuinfo.ip6m_mtu)
1130 if (put_user(len, optlen))
1132 if (copy_to_user(optval, &mtuinfo, len))
1139 case IPV6_TRANSPARENT:
1140 val = inet_sk(sk)->transparent;
1143 case IPV6_RECVORIGDSTADDR:
1144 val = np->rxopt.bits.rxorigdstaddr;
1147 case IPV6_UNICAST_HOPS:
1148 case IPV6_MULTICAST_HOPS:
1150 struct dst_entry *dst;
1152 if (optname == IPV6_UNICAST_HOPS)
1153 val = np->hop_limit;
1155 val = np->mcast_hops;
1159 dst = __sk_dst_get(sk);
1161 val = ip6_dst_hoplimit(dst);
1166 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1170 case IPV6_MULTICAST_LOOP:
1174 case IPV6_MULTICAST_IF:
1175 val = np->mcast_oif;
1178 case IPV6_MTU_DISCOVER:
1186 case IPV6_FLOWINFO_SEND:
1190 case IPV6_ADDR_PREFERENCES:
1193 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1194 val |= IPV6_PREFER_SRC_TMP;
1195 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1196 val |= IPV6_PREFER_SRC_PUBLIC;
1198 /* XXX: should we return system default? */
1199 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1202 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1203 val |= IPV6_PREFER_SRC_COA;
1205 val |= IPV6_PREFER_SRC_HOME;
1208 case IPV6_MINHOPCOUNT:
1209 val = np->min_hopcount;
1217 return -ENOPROTOOPT;
1219 len = min_t(unsigned int, sizeof(int), len);
1220 if(put_user(len, optlen))
1222 if(copy_to_user(optval,&val,len))
1227 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1228 char __user *optval, int __user *optlen)
1232 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1233 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1235 if(level != SOL_IPV6)
1236 return -ENOPROTOOPT;
1238 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1239 #ifdef CONFIG_NETFILTER
1240 /* we need to exclude all possible ENOPROTOOPTs except default case */
1241 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1244 if (get_user(len, optlen))
1248 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1252 err = put_user(len, optlen);
1258 EXPORT_SYMBOL(ipv6_getsockopt);
1260 #ifdef CONFIG_COMPAT
1261 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1262 char __user *optval, int __user *optlen)
1266 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1267 if (udp_prot.compat_getsockopt != NULL)
1268 return udp_prot.compat_getsockopt(sk, level, optname,
1270 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1273 if (level != SOL_IPV6)
1274 return -ENOPROTOOPT;
1276 if (optname == MCAST_MSFILTER)
1277 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1280 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1282 #ifdef CONFIG_NETFILTER
1283 /* we need to exclude all possible ENOPROTOOPTs except default case */
1284 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1287 if (get_user(len, optlen))
1291 err = compat_nf_getsockopt(sk, PF_INET6,
1292 optname, optval, &len);
1295 err = put_user(len, optlen);
1301 EXPORT_SYMBOL(compat_ipv6_getsockopt);