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>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
51 #include <net/udplite.h>
53 #include <net/compat.h>
55 #include <asm/uaccess.h>
57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
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)->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);
103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
104 struct ipv6_txoptions *opt)
106 if (inet_sk(sk)->is_icsk) {
108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
109 inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
110 struct inet_connection_sock *icsk = inet_csk(sk);
111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
114 opt = xchg(&inet6_sk(sk)->opt, opt);
116 write_lock(&sk->sk_dst_lock);
117 opt = xchg(&inet6_sk(sk)->opt, opt);
118 write_unlock(&sk->sk_dst_lock);
125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
126 char __user *optval, int optlen)
128 struct ipv6_pinfo *np = inet6_sk(sk);
129 struct net *net = sock_net(sk);
131 int retv = -ENOPROTOOPT;
136 if (optlen >= sizeof(int)) {
137 if (get_user(val, (int __user *) optval))
145 if (ip6_mroute_opt(optname))
146 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
153 if (optlen < sizeof(int))
155 if (val == PF_INET) {
156 struct ipv6_txoptions *opt;
157 struct sk_buff *pktopt;
159 if (sk->sk_type == SOCK_RAW)
162 if (sk->sk_protocol == IPPROTO_UDP ||
163 sk->sk_protocol == IPPROTO_UDPLITE) {
164 struct udp_sock *up = udp_sk(sk);
165 if (up->pending == AF_INET6) {
169 } else if (sk->sk_protocol != IPPROTO_TCP)
172 if (sk->sk_state != TCP_ESTABLISHED) {
177 if (ipv6_only_sock(sk) ||
178 !ipv6_addr_v4mapped(&np->daddr)) {
179 retv = -EADDRNOTAVAIL;
183 fl6_free_socklist(sk);
184 ipv6_sock_mc_close(sk);
187 * Sock is moving from IPv6 to IPv4 (sk_prot), so
188 * remove it from the refcnt debug socks count in the
191 sk_refcnt_debug_dec(sk);
193 if (sk->sk_protocol == IPPROTO_TCP) {
194 struct inet_connection_sock *icsk = inet_csk(sk);
196 sock_prot_inuse_add(net, sk->sk_prot, -1);
197 sock_prot_inuse_add(net, &tcp_prot, 1);
199 sk->sk_prot = &tcp_prot;
200 icsk->icsk_af_ops = &ipv4_specific;
201 sk->sk_socket->ops = &inet_stream_ops;
202 sk->sk_family = PF_INET;
203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
205 struct proto *prot = &udp_prot;
207 if (sk->sk_protocol == IPPROTO_UDPLITE)
208 prot = &udplite_prot;
210 sock_prot_inuse_add(net, sk->sk_prot, -1);
211 sock_prot_inuse_add(net, prot, 1);
214 sk->sk_socket->ops = &inet_dgram_ops;
215 sk->sk_family = PF_INET;
217 opt = xchg(&np->opt, NULL);
219 sock_kfree_s(sk, opt, opt->tot_len);
220 pktopt = xchg(&np->pktoptions, NULL);
223 sk->sk_destruct = inet_sock_destruct;
225 * ... and add it to the refcnt debug socks count
226 * in the new family. -acme
228 sk_refcnt_debug_inc(sk);
229 module_put(THIS_MODULE);
236 if (optlen < sizeof(int) ||
239 np->ipv6only = valbool;
243 case IPV6_RECVPKTINFO:
244 if (optlen < sizeof(int))
246 np->rxopt.bits.rxinfo = valbool;
250 case IPV6_2292PKTINFO:
251 if (optlen < sizeof(int))
253 np->rxopt.bits.rxoinfo = valbool;
257 case IPV6_RECVHOPLIMIT:
258 if (optlen < sizeof(int))
260 np->rxopt.bits.rxhlim = valbool;
264 case IPV6_2292HOPLIMIT:
265 if (optlen < sizeof(int))
267 np->rxopt.bits.rxohlim = valbool;
272 if (optlen < sizeof(int))
274 np->rxopt.bits.srcrt = valbool;
279 if (optlen < sizeof(int))
281 np->rxopt.bits.osrcrt = valbool;
285 case IPV6_RECVHOPOPTS:
286 if (optlen < sizeof(int))
288 np->rxopt.bits.hopopts = valbool;
292 case IPV6_2292HOPOPTS:
293 if (optlen < sizeof(int))
295 np->rxopt.bits.ohopopts = valbool;
299 case IPV6_RECVDSTOPTS:
300 if (optlen < sizeof(int))
302 np->rxopt.bits.dstopts = valbool;
306 case IPV6_2292DSTOPTS:
307 if (optlen < sizeof(int))
309 np->rxopt.bits.odstopts = valbool;
314 if (optlen < sizeof(int))
316 if (val < -1 || val > 0xff)
318 /* RFC 3542, 6.5: default traffic class of 0x0 */
325 case IPV6_RECVTCLASS:
326 if (optlen < sizeof(int))
328 np->rxopt.bits.rxtclass = valbool;
333 if (optlen < sizeof(int))
335 np->rxopt.bits.rxflow = valbool;
340 case IPV6_RTHDRDSTOPTS:
344 struct ipv6_txoptions *opt;
346 /* remove any sticky options header with a zero option
347 * length, per RFC3542.
351 else if (optval == NULL)
353 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
354 optlen & 0x7 || optlen > 8 * 255)
357 /* hop-by-hop / destination options are privileged option */
359 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
362 opt = ipv6_renew_options(sk, np->opt, optname,
363 (struct ipv6_opt_hdr __user *)optval,
370 /* routing header option needs extra check */
372 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
373 struct ipv6_rt_hdr *rthdr = opt->srcrt;
374 switch (rthdr->type) {
375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
376 case IPV6_SRCRT_TYPE_2:
377 if (rthdr->hdrlen != 2 ||
378 rthdr->segments_left != 1)
389 opt = ipv6_update_options(sk, opt);
392 sock_kfree_s(sk, opt, opt->tot_len);
398 struct in6_pktinfo pkt;
402 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
405 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
409 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
412 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
413 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
418 case IPV6_2292PKTOPTIONS:
420 struct ipv6_txoptions *opt = NULL;
425 fl.fl6_flowlabel = 0;
426 fl.oif = sk->sk_bound_dev_if;
431 /* 1K is probably excessive
432 * 1K is surely not enough, 2K per standard header is 16K.
435 if (optlen > 64*1024)
438 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
443 memset(opt, 0, sizeof(*opt));
444 opt->tot_len = sizeof(*opt) + optlen;
446 if (copy_from_user(opt+1, optval, optlen))
449 msg.msg_controllen = optlen;
450 msg.msg_control = (void*)(opt+1);
452 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
457 opt = ipv6_update_options(sk, opt);
460 sock_kfree_s(sk, opt, opt->tot_len);
463 case IPV6_UNICAST_HOPS:
464 if (optlen < sizeof(int))
466 if (val > 255 || val < -1)
472 case IPV6_MULTICAST_HOPS:
473 if (sk->sk_type == SOCK_STREAM)
475 if (optlen < sizeof(int))
477 if (val > 255 || val < -1)
479 np->mcast_hops = val;
483 case IPV6_MULTICAST_LOOP:
484 if (optlen < sizeof(int))
488 np->mc_loop = valbool;
492 case IPV6_MULTICAST_IF:
493 if (sk->sk_type == SOCK_STREAM)
495 if (optlen < sizeof(int))
499 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
502 if (__dev_get_by_index(net, val) == NULL) {
510 case IPV6_ADD_MEMBERSHIP:
511 case IPV6_DROP_MEMBERSHIP:
513 struct ipv6_mreq mreq;
515 if (optlen < sizeof(struct ipv6_mreq))
519 if (inet_sk(sk)->is_icsk)
523 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
526 if (optname == IPV6_ADD_MEMBERSHIP)
527 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
529 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
532 case IPV6_JOIN_ANYCAST:
533 case IPV6_LEAVE_ANYCAST:
535 struct ipv6_mreq mreq;
537 if (optlen < sizeof(struct ipv6_mreq))
541 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
544 if (optname == IPV6_JOIN_ANYCAST)
545 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
547 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
550 case MCAST_JOIN_GROUP:
551 case MCAST_LEAVE_GROUP:
553 struct group_req greq;
554 struct sockaddr_in6 *psin6;
556 if (optlen < sizeof(struct group_req))
560 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
562 if (greq.gr_group.ss_family != AF_INET6) {
563 retv = -EADDRNOTAVAIL;
566 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
567 if (optname == MCAST_JOIN_GROUP)
568 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
571 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
575 case MCAST_JOIN_SOURCE_GROUP:
576 case MCAST_LEAVE_SOURCE_GROUP:
577 case MCAST_BLOCK_SOURCE:
578 case MCAST_UNBLOCK_SOURCE:
580 struct group_source_req greqs;
583 if (optlen < sizeof(struct group_source_req))
585 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
589 if (greqs.gsr_group.ss_family != AF_INET6 ||
590 greqs.gsr_source.ss_family != AF_INET6) {
591 retv = -EADDRNOTAVAIL;
594 if (optname == MCAST_BLOCK_SOURCE) {
595 omode = MCAST_EXCLUDE;
597 } else if (optname == MCAST_UNBLOCK_SOURCE) {
598 omode = MCAST_EXCLUDE;
600 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
601 struct sockaddr_in6 *psin6;
603 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
604 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
606 /* prior join w/ different source is ok */
607 if (retv && retv != -EADDRINUSE)
609 omode = MCAST_INCLUDE;
611 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
612 omode = MCAST_INCLUDE;
615 retv = ip6_mc_source(add, omode, sk, &greqs);
620 extern int sysctl_mld_max_msf;
621 struct group_filter *gsf;
623 if (optlen < GROUP_FILTER_SIZE(0))
625 if (optlen > sysctl_optmem_max) {
629 gsf = kmalloc(optlen,GFP_KERNEL);
635 if (copy_from_user(gsf, optval, optlen)) {
639 /* numsrc >= (4G-140)/128 overflow in 32 bits */
640 if (gsf->gf_numsrc >= 0x1ffffffU ||
641 gsf->gf_numsrc > sysctl_mld_max_msf) {
646 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
651 retv = ip6_mc_msfilter(sk, gsf);
656 case IPV6_ROUTER_ALERT:
657 if (optlen < sizeof(int))
659 retv = ip6_ra_control(sk, val);
661 case IPV6_MTU_DISCOVER:
662 if (optlen < sizeof(int))
670 if (optlen < sizeof(int))
672 if (val && val < IPV6_MIN_MTU)
678 if (optlen < sizeof(int))
680 np->recverr = valbool;
682 skb_queue_purge(&sk->sk_error_queue);
685 case IPV6_FLOWINFO_SEND:
686 if (optlen < sizeof(int))
688 np->sndflow = valbool;
691 case IPV6_FLOWLABEL_MGR:
692 retv = ipv6_flowlabel_opt(sk, optval, optlen);
694 case IPV6_IPSEC_POLICY:
695 case IPV6_XFRM_POLICY:
697 if (!capable(CAP_NET_ADMIN))
699 retv = xfrm_user_policy(sk, optname, optval, optlen);
702 case IPV6_ADDR_PREFERENCES:
704 unsigned int pref = 0;
705 unsigned int prefmask = ~0;
707 if (optlen < sizeof(int))
712 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
713 switch (val & (IPV6_PREFER_SRC_PUBLIC|
715 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
716 case IPV6_PREFER_SRC_PUBLIC:
717 pref |= IPV6_PREFER_SRC_PUBLIC;
719 case IPV6_PREFER_SRC_TMP:
720 pref |= IPV6_PREFER_SRC_TMP;
722 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
725 goto pref_skip_pubtmp;
730 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
731 IPV6_PREFER_SRC_TMP);
734 /* check HOME/COA conflicts */
735 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
736 case IPV6_PREFER_SRC_HOME:
738 case IPV6_PREFER_SRC_COA:
739 pref |= IPV6_PREFER_SRC_COA;
746 prefmask &= ~IPV6_PREFER_SRC_COA;
749 /* check CGA/NONCGA conflicts */
750 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
751 case IPV6_PREFER_SRC_CGA:
752 case IPV6_PREFER_SRC_NONCGA:
759 np->srcprefs = (np->srcprefs & prefmask) | pref;
775 int ipv6_setsockopt(struct sock *sk, int level, int optname,
776 char __user *optval, int optlen)
780 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
781 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
783 if (level != SOL_IPV6)
786 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
787 #ifdef CONFIG_NETFILTER
788 /* we need to exclude all possible ENOPROTOOPTs except default case */
789 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
790 optname != IPV6_XFRM_POLICY) {
792 err = nf_setsockopt(sk, PF_INET6, optname, optval,
800 EXPORT_SYMBOL(ipv6_setsockopt);
803 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
804 char __user *optval, int optlen)
808 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
809 if (udp_prot.compat_setsockopt != NULL)
810 return udp_prot.compat_setsockopt(sk, level, optname,
812 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
815 if (level != SOL_IPV6)
818 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
819 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
822 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
823 #ifdef CONFIG_NETFILTER
824 /* we need to exclude all possible ENOPROTOOPTs except default case */
825 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
826 optname != IPV6_XFRM_POLICY) {
828 err = compat_nf_setsockopt(sk, PF_INET6, optname,
836 EXPORT_SYMBOL(compat_ipv6_setsockopt);
839 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
840 int optname, char __user *optval, int len)
842 struct ipv6_opt_hdr *hdr;
851 case IPV6_RTHDRDSTOPTS:
855 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
861 return -EINVAL; /* should not happen */
867 len = min_t(unsigned int, len, ipv6_optlen(hdr));
868 if (copy_to_user(optval, hdr, len))
873 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
874 char __user *optval, int __user *optlen)
876 struct ipv6_pinfo *np = inet6_sk(sk);
880 if (ip6_mroute_opt(optname))
881 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
883 if (get_user(len, optlen))
887 if (sk->sk_protocol != IPPROTO_UDP &&
888 sk->sk_protocol != IPPROTO_UDPLITE &&
889 sk->sk_protocol != IPPROTO_TCP)
891 if (sk->sk_state != TCP_ESTABLISHED)
897 struct group_filter gsf;
900 if (len < GROUP_FILTER_SIZE(0))
902 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
904 if (gsf.gf_group.ss_family != AF_INET6)
905 return -EADDRNOTAVAIL;
907 err = ip6_mc_msfget(sk, &gsf,
908 (struct group_filter __user *)optval, optlen);
913 case IPV6_2292PKTOPTIONS:
918 if (sk->sk_type != SOCK_STREAM)
921 msg.msg_control = optval;
922 msg.msg_controllen = len;
926 skb = np->pktoptions;
928 atomic_inc(&skb->users);
932 int err = datagram_recv_ctl(sk, &msg, skb);
937 if (np->rxopt.bits.rxinfo) {
938 struct in6_pktinfo src_info;
939 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
940 np->sticky_pktinfo.ipi6_ifindex;
941 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
942 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
943 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
945 if (np->rxopt.bits.rxhlim) {
946 int hlim = np->mcast_hops;
947 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
949 if (np->rxopt.bits.rxoinfo) {
950 struct in6_pktinfo src_info;
951 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
952 np->sticky_pktinfo.ipi6_ifindex;
953 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
954 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
955 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
957 if (np->rxopt.bits.rxohlim) {
958 int hlim = np->mcast_hops;
959 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
962 len -= msg.msg_controllen;
963 return put_user(len, optlen);
967 struct dst_entry *dst;
970 dst = sk_dst_get(sk);
985 case IPV6_RECVPKTINFO:
986 val = np->rxopt.bits.rxinfo;
989 case IPV6_2292PKTINFO:
990 val = np->rxopt.bits.rxoinfo;
993 case IPV6_RECVHOPLIMIT:
994 val = np->rxopt.bits.rxhlim;
997 case IPV6_2292HOPLIMIT:
998 val = np->rxopt.bits.rxohlim;
1001 case IPV6_RECVRTHDR:
1002 val = np->rxopt.bits.srcrt;
1005 case IPV6_2292RTHDR:
1006 val = np->rxopt.bits.osrcrt;
1010 case IPV6_RTHDRDSTOPTS:
1016 len = ipv6_getsockopt_sticky(sk, np->opt,
1017 optname, optval, len);
1019 /* check if ipv6_getsockopt_sticky() returns err code */
1022 return put_user(len, optlen);
1025 case IPV6_RECVHOPOPTS:
1026 val = np->rxopt.bits.hopopts;
1029 case IPV6_2292HOPOPTS:
1030 val = np->rxopt.bits.ohopopts;
1033 case IPV6_RECVDSTOPTS:
1034 val = np->rxopt.bits.dstopts;
1037 case IPV6_2292DSTOPTS:
1038 val = np->rxopt.bits.odstopts;
1045 case IPV6_RECVTCLASS:
1046 val = np->rxopt.bits.rxtclass;
1050 val = np->rxopt.bits.rxflow;
1053 case IPV6_UNICAST_HOPS:
1054 case IPV6_MULTICAST_HOPS:
1056 struct dst_entry *dst;
1058 if (optname == IPV6_UNICAST_HOPS)
1059 val = np->hop_limit;
1061 val = np->mcast_hops;
1063 dst = sk_dst_get(sk);
1066 val = ip6_dst_hoplimit(dst);
1070 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1074 case IPV6_MULTICAST_LOOP:
1078 case IPV6_MULTICAST_IF:
1079 val = np->mcast_oif;
1082 case IPV6_MTU_DISCOVER:
1090 case IPV6_FLOWINFO_SEND:
1094 case IPV6_ADDR_PREFERENCES:
1097 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1098 val |= IPV6_PREFER_SRC_TMP;
1099 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1100 val |= IPV6_PREFER_SRC_PUBLIC;
1102 /* XXX: should we return system default? */
1103 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1106 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1107 val |= IPV6_PREFER_SRC_COA;
1109 val |= IPV6_PREFER_SRC_HOME;
1113 return -ENOPROTOOPT;
1115 len = min_t(unsigned int, sizeof(int), len);
1116 if(put_user(len, optlen))
1118 if(copy_to_user(optval,&val,len))
1123 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1124 char __user *optval, int __user *optlen)
1128 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1129 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1131 if(level != SOL_IPV6)
1132 return -ENOPROTOOPT;
1134 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1135 #ifdef CONFIG_NETFILTER
1136 /* we need to exclude all possible ENOPROTOOPTs except default case */
1137 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1140 if (get_user(len, optlen))
1144 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1148 err = put_user(len, optlen);
1154 EXPORT_SYMBOL(ipv6_getsockopt);
1156 #ifdef CONFIG_COMPAT
1157 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1158 char __user *optval, int __user *optlen)
1162 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1163 if (udp_prot.compat_getsockopt != NULL)
1164 return udp_prot.compat_getsockopt(sk, level, optname,
1166 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1169 if (level != SOL_IPV6)
1170 return -ENOPROTOOPT;
1172 if (optname == MCAST_MSFILTER)
1173 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1176 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1177 #ifdef CONFIG_NETFILTER
1178 /* we need to exclude all possible ENOPROTOOPTs except default case */
1179 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1182 if (get_user(len, optlen))
1186 err = compat_nf_getsockopt(sk, PF_INET6,
1187 optname, optval, &len);
1190 err = put_user(len, optlen);
1196 EXPORT_SYMBOL(compat_ipv6_getsockopt);