2 * Internet Control Message Protocol (ICMPv6)
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $
10 * Based on net/ipv4/icmp.c
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
23 * Andi Kleen : exception handling
24 * Andi Kleen add rate limits. never reply to a icmp.
25 * add more length checks and other fixes.
26 * yoshfuji : ensure to sent parameter problem for
28 * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
30 * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support
31 * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
34 #include <linux/module.h>
35 #include <linux/errno.h>
36 #include <linux/types.h>
37 #include <linux/socket.h>
39 #include <linux/kernel.h>
40 #include <linux/sockios.h>
41 #include <linux/net.h>
42 #include <linux/skbuff.h>
43 #include <linux/init.h>
44 #include <linux/netfilter.h>
47 #include <linux/sysctl.h>
50 #include <linux/inet.h>
51 #include <linux/netdevice.h>
52 #include <linux/icmpv6.h>
58 #include <net/ip6_checksum.h>
59 #include <net/protocol.h>
61 #include <net/rawv6.h>
62 #include <net/transp_v6.h>
63 #include <net/ip6_route.h>
64 #include <net/addrconf.h>
68 #include <asm/uaccess.h>
69 #include <asm/system.h>
71 DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly;
72 EXPORT_SYMBOL(icmpv6_statistics);
73 DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly;
74 EXPORT_SYMBOL(icmpv6msg_statistics);
77 * The ICMP socket(s). This is the most convenient way to flow control
78 * our ICMP output as well as maintain a clean interface throughout
79 * all layers. All Socketless IP sends will soon be gone.
81 * On SMP we have one ICMP socket per-cpu.
83 static inline struct sock *icmpv6_sk(struct net *net)
85 return net->ipv6.icmp_sk[smp_processor_id()];
88 static int icmpv6_rcv(struct sk_buff *skb);
90 static struct inet6_protocol icmpv6_protocol = {
91 .handler = icmpv6_rcv,
92 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
95 static __inline__ int icmpv6_xmit_lock(struct sock *sk)
99 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
100 /* This can happen if the output path (f.e. SIT or
101 * ip6ip6 tunnel) signals dst_link_failure() for an
102 * outgoing ICMP6 packet.
110 static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
112 spin_unlock_bh(&sk->sk_lock.slock);
116 * Slightly more convenient version of icmpv6_send.
118 void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
120 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
125 * Figure out, may we reply to this packet with icmp error.
127 * We do not reply, if:
128 * - it was icmp error message.
129 * - it is truncated, so that it is known, that protocol is ICMPV6
130 * (i.e. in the middle of some exthdr)
135 static int is_ineligible(struct sk_buff *skb)
137 int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
138 int len = skb->len - ptr;
139 __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
144 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr);
147 if (nexthdr == IPPROTO_ICMPV6) {
149 tp = skb_header_pointer(skb,
150 ptr+offsetof(struct icmp6hdr, icmp6_type),
151 sizeof(_type), &_type);
153 !(*tp & ICMPV6_INFOMSG_MASK))
160 * Check the ICMP output rate limit
162 static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
165 struct dst_entry *dst;
166 struct net *net = sock_net(sk);
169 /* Informational messages are not limited. */
170 if (type & ICMPV6_INFOMSG_MASK)
173 /* Do not limit pmtu discovery, it would break it. */
174 if (type == ICMPV6_PKT_TOOBIG)
178 * Look up the output route.
179 * XXX: perhaps the expire for routing entries cloned by
180 * this lookup should be more aggressive (not longer than timeout).
182 dst = ip6_route_output(net, sk, fl);
184 IP6_INC_STATS(ip6_dst_idev(dst),
185 IPSTATS_MIB_OUTNOROUTES);
186 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
189 struct rt6_info *rt = (struct rt6_info *)dst;
190 int tmo = net->ipv6.sysctl.icmpv6_time;
192 /* Give more bandwidth to wider prefixes. */
193 if (rt->rt6i_dst.plen < 128)
194 tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
196 res = xrlim_allow(dst, tmo);
203 * an inline helper for the "simple" if statement below
204 * checks if parameter problem report is caused by an
205 * unrecognized IPv6 option that has the Option Type
206 * highest-order two bits set to 10
209 static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
213 offset += skb_network_offset(skb);
214 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
217 return (*op & 0xC0) == 0x80;
220 static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len)
223 struct icmp6hdr *icmp6h;
226 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
229 icmp6h = icmp6_hdr(skb);
230 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
231 icmp6h->icmp6_cksum = 0;
233 if (skb_queue_len(&sk->sk_write_queue) == 1) {
234 skb->csum = csum_partial((char *)icmp6h,
235 sizeof(struct icmp6hdr), skb->csum);
236 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
243 skb_queue_walk(&sk->sk_write_queue, skb) {
244 tmp_csum = csum_add(tmp_csum, skb->csum);
247 tmp_csum = csum_partial((char *)icmp6h,
248 sizeof(struct icmp6hdr), tmp_csum);
249 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
254 ip6_push_pending_frames(sk);
265 static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
267 struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
268 struct sk_buff *org_skb = msg->skb;
271 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
273 skb->csum = csum_block_add(skb->csum, csum, odd);
274 if (!(msg->type & ICMPV6_INFOMSG_MASK))
275 nf_ct_attach(skb, org_skb);
279 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
280 static void mip6_addr_swap(struct sk_buff *skb)
282 struct ipv6hdr *iph = ipv6_hdr(skb);
283 struct inet6_skb_parm *opt = IP6CB(skb);
284 struct ipv6_destopt_hao *hao;
289 off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
290 if (likely(off >= 0)) {
291 hao = (struct ipv6_destopt_hao *)
292 (skb_network_header(skb) + off);
293 ipv6_addr_copy(&tmp, &iph->saddr);
294 ipv6_addr_copy(&iph->saddr, &hao->addr);
295 ipv6_addr_copy(&hao->addr, &tmp);
300 static inline void mip6_addr_swap(struct sk_buff *skb) {}
304 * Send an ICMP message in response to a packet in error
306 void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
307 struct net_device *dev)
309 struct net *net = dev_net(skb->dev);
310 struct inet6_dev *idev = NULL;
311 struct ipv6hdr *hdr = ipv6_hdr(skb);
313 struct ipv6_pinfo *np;
314 struct in6_addr *saddr = NULL;
315 struct dst_entry *dst;
316 struct dst_entry *dst2;
317 struct icmp6hdr tmp_hdr;
320 struct icmpv6_msg msg;
327 if ((u8 *)hdr < skb->head ||
328 (skb->network_header + sizeof(*hdr)) > skb->tail)
332 * Make sure we respect the rules
333 * i.e. RFC 1885 2.4(e)
334 * Rule (e.1) is enforced by not using icmpv6_send
335 * in any code that processes icmp errors.
337 addr_type = ipv6_addr_type(&hdr->daddr);
339 if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0))
346 if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
347 if (type != ICMPV6_PKT_TOOBIG &&
348 !(type == ICMPV6_PARAMPROB &&
349 code == ICMPV6_UNK_OPTION &&
350 (opt_unrec(skb, info))))
356 addr_type = ipv6_addr_type(&hdr->saddr);
362 if (addr_type & IPV6_ADDR_LINKLOCAL)
363 iif = skb->dev->ifindex;
366 * Must not send error if the source does not uniquely
367 * identify a single node (RFC2463 Section 2.4).
368 * We check unspecified / multicast addresses here,
369 * and anycast addresses will be checked later.
371 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
372 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
377 * Never answer to a ICMP packet.
379 if (is_ineligible(skb)) {
380 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
386 memset(&fl, 0, sizeof(fl));
387 fl.proto = IPPROTO_ICMPV6;
388 ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr);
390 ipv6_addr_copy(&fl.fl6_src, saddr);
392 fl.fl_icmp_type = type;
393 fl.fl_icmp_code = code;
394 security_skb_classify_flow(skb, &fl);
399 if (icmpv6_xmit_lock(sk))
402 if (!icmpv6_xrlim_allow(sk, type, &fl))
405 tmp_hdr.icmp6_type = type;
406 tmp_hdr.icmp6_code = code;
407 tmp_hdr.icmp6_cksum = 0;
408 tmp_hdr.icmp6_pointer = htonl(info);
410 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
411 fl.oif = np->mcast_oif;
413 err = ip6_dst_lookup(sk, &dst, &fl);
418 * We won't send icmp if the destination is known
421 if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
422 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
423 goto out_dst_release;
426 /* No need to clone since we're just using its address. */
429 err = xfrm_lookup(&dst, &fl, sk, 0);
442 if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6))
445 if (ip6_dst_lookup(sk, &dst2, &fl))
448 err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP);
449 if (err == -ENOENT) {
462 if (ipv6_addr_is_multicast(&fl.fl6_dst))
463 hlimit = np->mcast_hops;
465 hlimit = np->hop_limit;
467 hlimit = ip6_dst_hoplimit(dst);
474 msg.offset = skb_network_offset(skb);
477 len = skb->len - msg.offset;
478 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
480 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n");
481 goto out_dst_release;
484 idev = in6_dev_get(skb->dev);
486 err = ip6_append_data(sk, icmpv6_getfrag, &msg,
487 len + sizeof(struct icmp6hdr),
488 sizeof(struct icmp6hdr),
489 hlimit, tclass, NULL, &fl, (struct rt6_info*)dst,
492 ip6_flush_pending_frames(sk);
495 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
498 if (likely(idev != NULL))
503 icmpv6_xmit_unlock(sk);
506 EXPORT_SYMBOL(icmpv6_send);
508 static void icmpv6_echo_reply(struct sk_buff *skb)
510 struct net *net = dev_net(skb->dev);
512 struct inet6_dev *idev;
513 struct ipv6_pinfo *np;
514 struct in6_addr *saddr = NULL;
515 struct icmp6hdr *icmph = icmp6_hdr(skb);
516 struct icmp6hdr tmp_hdr;
518 struct icmpv6_msg msg;
519 struct dst_entry *dst;
524 saddr = &ipv6_hdr(skb)->daddr;
526 if (!ipv6_unicast_destination(skb))
529 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
530 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
532 memset(&fl, 0, sizeof(fl));
533 fl.proto = IPPROTO_ICMPV6;
534 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
536 ipv6_addr_copy(&fl.fl6_src, saddr);
537 fl.oif = skb->dev->ifindex;
538 fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
539 security_skb_classify_flow(skb, &fl);
544 if (icmpv6_xmit_lock(sk))
547 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
548 fl.oif = np->mcast_oif;
550 err = ip6_dst_lookup(sk, &dst, &fl);
553 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
556 if (ipv6_addr_is_multicast(&fl.fl6_dst))
557 hlimit = np->mcast_hops;
559 hlimit = np->hop_limit;
561 hlimit = ip6_dst_hoplimit(dst);
567 idev = in6_dev_get(skb->dev);
571 msg.type = ICMPV6_ECHO_REPLY;
573 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
574 sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl,
575 (struct rt6_info*)dst, MSG_DONTWAIT);
578 ip6_flush_pending_frames(sk);
581 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
584 if (likely(idev != NULL))
588 icmpv6_xmit_unlock(sk);
591 static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info)
593 struct inet6_protocol *ipprot;
598 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
601 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
602 if (ipv6_ext_hdr(nexthdr)) {
603 /* now skip over extension headers */
604 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
608 inner_offset = sizeof(struct ipv6hdr);
611 /* Checkin header including 8 bytes of inner protocol header. */
612 if (!pskb_may_pull(skb, inner_offset+8))
615 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
616 Without this we will not able f.e. to make source routed
618 Corresponding argument (opt) to notifiers is already added.
622 hash = nexthdr & (MAX_INET_PROTOS - 1);
625 ipprot = rcu_dereference(inet6_protos[hash]);
626 if (ipprot && ipprot->err_handler)
627 ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
630 raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
634 * Handle icmp messages
637 static int icmpv6_rcv(struct sk_buff *skb)
639 struct net_device *dev = skb->dev;
640 struct inet6_dev *idev = __in6_dev_get(dev);
641 struct in6_addr *saddr, *daddr;
642 struct ipv6hdr *orig_hdr;
643 struct icmp6hdr *hdr;
646 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
649 if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags &
653 if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr)))
656 nh = skb_network_offset(skb);
657 skb_set_network_header(skb, sizeof(*hdr));
659 if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
662 skb_set_network_header(skb, nh);
665 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS);
667 saddr = &ipv6_hdr(skb)->saddr;
668 daddr = &ipv6_hdr(skb)->daddr;
670 /* Perform checksum. */
671 switch (skb->ip_summed) {
672 case CHECKSUM_COMPLETE:
673 if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
678 skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
680 if (__skb_checksum_complete(skb)) {
681 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n",
682 NIP6(*saddr), NIP6(*daddr));
687 if (!pskb_pull(skb, sizeof(*hdr)))
690 hdr = icmp6_hdr(skb);
692 type = hdr->icmp6_type;
694 ICMP6MSGIN_INC_STATS_BH(idev, type);
697 case ICMPV6_ECHO_REQUEST:
698 icmpv6_echo_reply(skb);
701 case ICMPV6_ECHO_REPLY:
702 /* we couldn't care less */
705 case ICMPV6_PKT_TOOBIG:
706 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
707 standard destination cache. Seems, only "advanced"
708 destination cache will allow to solve this problem
711 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
713 hdr = icmp6_hdr(skb);
714 orig_hdr = (struct ipv6hdr *) (hdr + 1);
715 rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
716 ntohl(hdr->icmp6_mtu));
719 * Drop through to notify
722 case ICMPV6_DEST_UNREACH:
723 case ICMPV6_TIME_EXCEED:
724 case ICMPV6_PARAMPROB:
725 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
728 case NDISC_ROUTER_SOLICITATION:
729 case NDISC_ROUTER_ADVERTISEMENT:
730 case NDISC_NEIGHBOUR_SOLICITATION:
731 case NDISC_NEIGHBOUR_ADVERTISEMENT:
736 case ICMPV6_MGM_QUERY:
737 igmp6_event_query(skb);
740 case ICMPV6_MGM_REPORT:
741 igmp6_event_report(skb);
744 case ICMPV6_MGM_REDUCTION:
745 case ICMPV6_NI_QUERY:
746 case ICMPV6_NI_REPLY:
747 case ICMPV6_MLD2_REPORT:
748 case ICMPV6_DHAAD_REQUEST:
749 case ICMPV6_DHAAD_REPLY:
750 case ICMPV6_MOBILE_PREFIX_SOL:
751 case ICMPV6_MOBILE_PREFIX_ADV:
755 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n");
758 if (type & ICMPV6_INFOMSG_MASK)
762 * error of unknown type.
763 * must pass to upper level
766 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
773 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
779 void icmpv6_flow_init(struct sock *sk, struct flowi *fl,
781 const struct in6_addr *saddr,
782 const struct in6_addr *daddr,
785 memset(fl, 0, sizeof(*fl));
786 ipv6_addr_copy(&fl->fl6_src, saddr);
787 ipv6_addr_copy(&fl->fl6_dst, daddr);
788 fl->proto = IPPROTO_ICMPV6;
789 fl->fl_icmp_type = type;
790 fl->fl_icmp_code = 0;
792 security_sk_classify_flow(sk, fl);
796 * Special lock-class for __icmpv6_sk:
798 static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
800 static int __net_init icmpv6_sk_init(struct net *net)
806 kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
807 if (net->ipv6.icmp_sk == NULL)
810 for_each_possible_cpu(i) {
812 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,
816 "Failed to initialize the ICMP6 control socket "
822 net->ipv6.icmp_sk[i] = sk = sock->sk;
823 sk_change_net(sk, net);
825 sk->sk_allocation = GFP_ATOMIC;
827 * Split off their lock-class, because sk->sk_dst_lock
828 * gets used from softirqs, which is safe for
829 * __icmpv6_sk (because those never get directly used
830 * via userspace syscalls), but unsafe for normal sockets.
832 lockdep_set_class(&sk->sk_dst_lock,
833 &icmpv6_socket_sk_dst_lock_key);
835 /* Enough space for 2 64K ICMP packets, including
836 * sk_buff struct overhead.
839 (2 * ((64 * 1024) + sizeof(struct sk_buff)));
841 sk->sk_prot->unhash(sk);
846 for (j = 0; j < i; j++)
847 sk_release_kernel(net->ipv6.icmp_sk[j]);
848 kfree(net->ipv6.icmp_sk);
852 static void __net_exit icmpv6_sk_exit(struct net *net)
856 for_each_possible_cpu(i) {
857 sk_release_kernel(net->ipv6.icmp_sk[i]);
859 kfree(net->ipv6.icmp_sk);
862 static struct pernet_operations icmpv6_sk_ops = {
863 .init = icmpv6_sk_init,
864 .exit = icmpv6_sk_exit,
867 int __init icmpv6_init(void)
871 err = register_pernet_subsys(&icmpv6_sk_ops);
876 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
881 printk(KERN_ERR "Failed to register ICMP6 protocol\n");
882 unregister_pernet_subsys(&icmpv6_sk_ops);
886 void icmpv6_cleanup(void)
888 unregister_pernet_subsys(&icmpv6_sk_ops);
889 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
893 static const struct icmp6_err {
901 { /* ADM_PROHIBITED */
905 { /* Was NOT_NEIGHBOUR, now reserved */
919 int icmpv6_err_convert(int type, int code, int *err)
926 case ICMPV6_DEST_UNREACH:
928 if (code <= ICMPV6_PORT_UNREACH) {
929 *err = tab_unreach[code].err;
930 fatal = tab_unreach[code].fatal;
934 case ICMPV6_PKT_TOOBIG:
938 case ICMPV6_PARAMPROB:
943 case ICMPV6_TIME_EXCEED:
951 EXPORT_SYMBOL(icmpv6_err_convert);
954 ctl_table ipv6_icmp_table_template[] = {
956 .ctl_name = NET_IPV6_ICMP_RATELIMIT,
957 .procname = "ratelimit",
958 .data = &init_net.ipv6.sysctl.icmpv6_time,
959 .maxlen = sizeof(int),
961 .proc_handler = &proc_dointvec
966 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net)
968 struct ctl_table *table;
970 table = kmemdup(ipv6_icmp_table_template,
971 sizeof(ipv6_icmp_table_template),
975 table[0].data = &net->ipv6.sysctl.icmpv6_time;