2 * Internet Control Message Protocol (ICMPv6)
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on net/ipv4/icmp.c
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
21 * Andi Kleen : exception handling
22 * Andi Kleen add rate limits. never reply to a icmp.
23 * add more length checks and other fixes.
24 * yoshfuji : ensure to sent parameter problem for
26 * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
28 * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support
29 * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
32 #define pr_fmt(fmt) "IPv6: " fmt
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>
45 #include <linux/slab.h>
48 #include <linux/sysctl.h>
51 #include <linux/inet.h>
52 #include <linux/netdevice.h>
53 #include <linux/icmpv6.h>
59 #include <net/ip6_checksum.h>
61 #include <net/protocol.h>
63 #include <net/rawv6.h>
64 #include <net/transp_v6.h>
65 #include <net/ip6_route.h>
66 #include <net/addrconf.h>
69 #include <net/inet_common.h>
71 #include <asm/uaccess.h>
74 * The ICMP socket(s). This is the most convenient way to flow control
75 * our ICMP output as well as maintain a clean interface throughout
76 * all layers. All Socketless IP sends will soon be gone.
78 * On SMP we have one ICMP socket per-cpu.
80 static inline struct sock *icmpv6_sk(struct net *net)
82 return net->ipv6.icmp_sk[smp_processor_id()];
85 static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
86 u8 type, u8 code, int offset, __be32 info)
88 /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
89 struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
90 struct net *net = dev_net(skb->dev);
92 if (type == ICMPV6_PKT_TOOBIG)
93 ip6_update_pmtu(skb, net, info, 0, 0, INVALID_UID);
94 else if (type == NDISC_REDIRECT)
95 ip6_redirect(skb, net, 0, 0);
97 if (!(type & ICMPV6_INFOMSG_MASK))
98 if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
99 ping_err(skb, offset, info);
102 static int icmpv6_rcv(struct sk_buff *skb);
104 static const struct inet6_protocol icmpv6_protocol = {
105 .handler = icmpv6_rcv,
106 .err_handler = icmpv6_err,
107 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
110 static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
117 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
118 /* This can happen if the output path (f.e. SIT or
119 * ip6ip6 tunnel) signals dst_link_failure() for an
120 * outgoing ICMP6 packet.
128 static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
130 spin_unlock_bh(&sk->sk_lock.slock);
134 * Figure out, may we reply to this packet with icmp error.
136 * We do not reply, if:
137 * - it was icmp error message.
138 * - it is truncated, so that it is known, that protocol is ICMPV6
139 * (i.e. in the middle of some exthdr)
144 static bool is_ineligible(const struct sk_buff *skb)
146 int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
147 int len = skb->len - ptr;
148 __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
154 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
157 if (nexthdr == IPPROTO_ICMPV6) {
159 tp = skb_header_pointer(skb,
160 ptr+offsetof(struct icmp6hdr, icmp6_type),
161 sizeof(_type), &_type);
163 !(*tp & ICMPV6_INFOMSG_MASK))
170 * Check the ICMP output rate limit
172 static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
175 struct dst_entry *dst;
176 struct net *net = sock_net(sk);
179 /* Informational messages are not limited. */
180 if (type & ICMPV6_INFOMSG_MASK)
183 /* Do not limit pmtu discovery, it would break it. */
184 if (type == ICMPV6_PKT_TOOBIG)
188 * Look up the output route.
189 * XXX: perhaps the expire for routing entries cloned by
190 * this lookup should be more aggressive (not longer than timeout).
192 dst = ip6_route_output(net, sk, fl6);
194 IP6_INC_STATS(net, ip6_dst_idev(dst),
195 IPSTATS_MIB_OUTNOROUTES);
196 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
199 struct rt6_info *rt = (struct rt6_info *)dst;
200 int tmo = net->ipv6.sysctl.icmpv6_time;
201 struct inet_peer *peer;
203 /* Give more bandwidth to wider prefixes. */
204 if (rt->rt6i_dst.plen < 128)
205 tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
207 peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
208 res = inet_peer_xrlim_allow(peer, tmo);
217 * an inline helper for the "simple" if statement below
218 * checks if parameter problem report is caused by an
219 * unrecognized IPv6 option that has the Option Type
220 * highest-order two bits set to 10
223 static bool opt_unrec(struct sk_buff *skb, __u32 offset)
227 offset += skb_network_offset(skb);
228 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
231 return (*op & 0xC0) == 0x80;
234 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
235 struct icmp6hdr *thdr, int len)
238 struct icmp6hdr *icmp6h;
241 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
244 icmp6h = icmp6_hdr(skb);
245 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
246 icmp6h->icmp6_cksum = 0;
248 if (skb_queue_len(&sk->sk_write_queue) == 1) {
249 skb->csum = csum_partial(icmp6h,
250 sizeof(struct icmp6hdr), skb->csum);
251 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
253 len, fl6->flowi6_proto,
258 skb_queue_walk(&sk->sk_write_queue, skb) {
259 tmp_csum = csum_add(tmp_csum, skb->csum);
262 tmp_csum = csum_partial(icmp6h,
263 sizeof(struct icmp6hdr), tmp_csum);
264 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
266 len, fl6->flowi6_proto,
269 ip6_push_pending_frames(sk);
280 static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
282 struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
283 struct sk_buff *org_skb = msg->skb;
286 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
288 skb->csum = csum_block_add(skb->csum, csum, odd);
289 if (!(msg->type & ICMPV6_INFOMSG_MASK))
290 nf_ct_attach(skb, org_skb);
294 #if IS_ENABLED(CONFIG_IPV6_MIP6)
295 static void mip6_addr_swap(struct sk_buff *skb)
297 struct ipv6hdr *iph = ipv6_hdr(skb);
298 struct inet6_skb_parm *opt = IP6CB(skb);
299 struct ipv6_destopt_hao *hao;
304 off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
305 if (likely(off >= 0)) {
306 hao = (struct ipv6_destopt_hao *)
307 (skb_network_header(skb) + off);
309 iph->saddr = hao->addr;
315 static inline void mip6_addr_swap(struct sk_buff *skb) {}
318 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
319 struct sock *sk, struct flowi6 *fl6)
321 struct dst_entry *dst, *dst2;
325 err = ip6_dst_lookup(sk, &dst, fl6);
330 * We won't send icmp if the destination is known
333 if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
334 LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n");
336 return ERR_PTR(-EINVAL);
339 /* No need to clone since we're just using its address. */
342 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
347 if (PTR_ERR(dst) == -EPERM)
353 err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
355 goto relookup_failed;
357 err = ip6_dst_lookup(sk, &dst2, &fl2);
359 goto relookup_failed;
361 dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
371 goto relookup_failed;
381 * Send an ICMP message in response to a packet in error
383 static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
385 struct net *net = dev_net(skb->dev);
386 struct inet6_dev *idev = NULL;
387 struct ipv6hdr *hdr = ipv6_hdr(skb);
389 struct ipv6_pinfo *np;
390 const struct in6_addr *saddr = NULL;
391 struct dst_entry *dst;
392 struct icmp6hdr tmp_hdr;
394 struct icmpv6_msg msg;
400 u32 mark = IP6_REPLY_MARK(net, skb->mark);
402 if ((u8 *)hdr < skb->head ||
403 (skb->network_header + sizeof(*hdr)) > skb->tail)
407 * Make sure we respect the rules
408 * i.e. RFC 1885 2.4(e)
409 * Rule (e.1) is enforced by not using icmp6_send
410 * in any code that processes icmp errors.
412 addr_type = ipv6_addr_type(&hdr->daddr);
414 if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0))
421 if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
422 if (type != ICMPV6_PKT_TOOBIG &&
423 !(type == ICMPV6_PARAMPROB &&
424 code == ICMPV6_UNK_OPTION &&
425 (opt_unrec(skb, info))))
431 addr_type = ipv6_addr_type(&hdr->saddr);
437 if (__ipv6_addr_needs_scope_id(addr_type))
438 iif = skb->dev->ifindex;
441 * Must not send error if the source does not uniquely
442 * identify a single node (RFC2463 Section 2.4).
443 * We check unspecified / multicast addresses here,
444 * and anycast addresses will be checked later.
446 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
447 LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n");
452 * Never answer to a ICMP packet.
454 if (is_ineligible(skb)) {
455 LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n");
461 memset(&fl6, 0, sizeof(fl6));
462 fl6.flowi6_proto = IPPROTO_ICMPV6;
463 fl6.daddr = hdr->saddr;
466 fl6.flowi6_mark = mark;
467 fl6.flowi6_oif = iif;
468 fl6.fl6_icmp_type = type;
469 fl6.fl6_icmp_code = code;
470 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
472 sk = icmpv6_xmit_lock(net);
478 if (!icmpv6_xrlim_allow(sk, type, &fl6))
481 tmp_hdr.icmp6_type = type;
482 tmp_hdr.icmp6_code = code;
483 tmp_hdr.icmp6_cksum = 0;
484 tmp_hdr.icmp6_pointer = htonl(info);
486 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
487 fl6.flowi6_oif = np->mcast_oif;
488 else if (!fl6.flowi6_oif)
489 fl6.flowi6_oif = np->ucast_oif;
491 dst = icmpv6_route_lookup(net, skb, sk, &fl6);
495 if (ipv6_addr_is_multicast(&fl6.daddr))
496 hlimit = np->mcast_hops;
498 hlimit = np->hop_limit;
500 hlimit = ip6_dst_hoplimit(dst);
503 msg.offset = skb_network_offset(skb);
506 len = skb->len - msg.offset;
507 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
509 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n");
510 goto out_dst_release;
514 idev = __in6_dev_get(skb->dev);
516 err = ip6_append_data(sk, icmpv6_getfrag, &msg,
517 len + sizeof(struct icmp6hdr),
518 sizeof(struct icmp6hdr), hlimit,
519 np->tclass, NULL, &fl6, (struct rt6_info *)dst,
520 MSG_DONTWAIT, np->dontfrag);
522 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
523 ip6_flush_pending_frames(sk);
525 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
526 len + sizeof(struct icmp6hdr));
532 icmpv6_xmit_unlock(sk);
535 /* Slightly more convenient version of icmp6_send.
537 void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
539 icmp6_send(skb, ICMPV6_PARAMPROB, code, pos);
543 static void icmpv6_echo_reply(struct sk_buff *skb)
545 struct net *net = dev_net(skb->dev);
547 struct inet6_dev *idev;
548 struct ipv6_pinfo *np;
549 const struct in6_addr *saddr = NULL;
550 struct icmp6hdr *icmph = icmp6_hdr(skb);
551 struct icmp6hdr tmp_hdr;
553 struct icmpv6_msg msg;
554 struct dst_entry *dst;
557 u32 mark = IP6_REPLY_MARK(net, skb->mark);
559 saddr = &ipv6_hdr(skb)->daddr;
561 if (!ipv6_unicast_destination(skb))
564 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
565 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
567 memset(&fl6, 0, sizeof(fl6));
568 fl6.flowi6_proto = IPPROTO_ICMPV6;
569 fl6.daddr = ipv6_hdr(skb)->saddr;
572 fl6.flowi6_oif = skb->dev->ifindex;
573 fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
574 fl6.flowi6_mark = mark;
575 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
577 sk = icmpv6_xmit_lock(net);
583 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
584 fl6.flowi6_oif = np->mcast_oif;
585 else if (!fl6.flowi6_oif)
586 fl6.flowi6_oif = np->ucast_oif;
588 err = ip6_dst_lookup(sk, &dst, &fl6);
591 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
595 if (ipv6_addr_is_multicast(&fl6.daddr))
596 hlimit = np->mcast_hops;
598 hlimit = np->hop_limit;
600 hlimit = ip6_dst_hoplimit(dst);
602 idev = __in6_dev_get(skb->dev);
606 msg.type = ICMPV6_ECHO_REPLY;
608 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
609 sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6,
610 (struct rt6_info *)dst, MSG_DONTWAIT,
614 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
615 ip6_flush_pending_frames(sk);
617 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
618 skb->len + sizeof(struct icmp6hdr));
622 icmpv6_xmit_unlock(sk);
625 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
627 const struct inet6_protocol *ipprot;
632 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
635 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
636 if (ipv6_ext_hdr(nexthdr)) {
637 /* now skip over extension headers */
638 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
639 &nexthdr, &frag_off);
643 inner_offset = sizeof(struct ipv6hdr);
646 /* Checkin header including 8 bytes of inner protocol header. */
647 if (!pskb_may_pull(skb, inner_offset+8))
650 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
651 Without this we will not able f.e. to make source routed
653 Corresponding argument (opt) to notifiers is already added.
658 ipprot = rcu_dereference(inet6_protos[nexthdr]);
659 if (ipprot && ipprot->err_handler)
660 ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
663 raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
667 * Handle icmp messages
670 static int icmpv6_rcv(struct sk_buff *skb)
672 struct net_device *dev = skb->dev;
673 struct inet6_dev *idev = __in6_dev_get(dev);
674 const struct in6_addr *saddr, *daddr;
675 struct icmp6hdr *hdr;
678 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
679 struct sec_path *sp = skb_sec_path(skb);
682 if (!(sp && sp->xvec[sp->len - 1]->props.flags &
686 if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
689 nh = skb_network_offset(skb);
690 skb_set_network_header(skb, sizeof(*hdr));
692 if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
695 skb_set_network_header(skb, nh);
698 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS);
700 saddr = &ipv6_hdr(skb)->saddr;
701 daddr = &ipv6_hdr(skb)->daddr;
703 /* Perform checksum. */
704 switch (skb->ip_summed) {
705 case CHECKSUM_COMPLETE:
706 if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
711 skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
713 if (__skb_checksum_complete(skb)) {
714 LIMIT_NETDEBUG(KERN_DEBUG
715 "ICMPv6 checksum failed [%pI6c > %pI6c]\n",
721 if (!pskb_pull(skb, sizeof(*hdr)))
724 hdr = icmp6_hdr(skb);
726 type = hdr->icmp6_type;
728 ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type);
731 case ICMPV6_ECHO_REQUEST:
732 icmpv6_echo_reply(skb);
735 case ICMPV6_ECHO_REPLY:
739 case ICMPV6_PKT_TOOBIG:
740 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
741 standard destination cache. Seems, only "advanced"
742 destination cache will allow to solve this problem
745 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
747 hdr = icmp6_hdr(skb);
750 * Drop through to notify
753 case ICMPV6_DEST_UNREACH:
754 case ICMPV6_TIME_EXCEED:
755 case ICMPV6_PARAMPROB:
756 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
759 case NDISC_ROUTER_SOLICITATION:
760 case NDISC_ROUTER_ADVERTISEMENT:
761 case NDISC_NEIGHBOUR_SOLICITATION:
762 case NDISC_NEIGHBOUR_ADVERTISEMENT:
767 case ICMPV6_MGM_QUERY:
768 igmp6_event_query(skb);
771 case ICMPV6_MGM_REPORT:
772 igmp6_event_report(skb);
775 case ICMPV6_MGM_REDUCTION:
776 case ICMPV6_NI_QUERY:
777 case ICMPV6_NI_REPLY:
778 case ICMPV6_MLD2_REPORT:
779 case ICMPV6_DHAAD_REQUEST:
780 case ICMPV6_DHAAD_REPLY:
781 case ICMPV6_MOBILE_PREFIX_SOL:
782 case ICMPV6_MOBILE_PREFIX_ADV:
786 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n");
789 if (type & ICMPV6_INFOMSG_MASK)
793 * error of unknown type.
794 * must pass to upper level
797 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
804 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
806 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS);
812 void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
814 const struct in6_addr *saddr,
815 const struct in6_addr *daddr,
818 memset(fl6, 0, sizeof(*fl6));
821 fl6->flowi6_proto = IPPROTO_ICMPV6;
822 fl6->fl6_icmp_type = type;
823 fl6->fl6_icmp_code = 0;
824 fl6->flowi6_oif = oif;
825 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
829 * Special lock-class for __icmpv6_sk:
831 static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
833 static int __net_init icmpv6_sk_init(struct net *net)
839 kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
840 if (net->ipv6.icmp_sk == NULL)
843 for_each_possible_cpu(i) {
844 err = inet_ctl_sock_create(&sk, PF_INET6,
845 SOCK_RAW, IPPROTO_ICMPV6, net);
847 pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
852 net->ipv6.icmp_sk[i] = sk;
855 * Split off their lock-class, because sk->sk_dst_lock
856 * gets used from softirqs, which is safe for
857 * __icmpv6_sk (because those never get directly used
858 * via userspace syscalls), but unsafe for normal sockets.
860 lockdep_set_class(&sk->sk_dst_lock,
861 &icmpv6_socket_sk_dst_lock_key);
863 /* Enough space for 2 64K ICMP packets, including
864 * sk_buff struct overhead.
866 sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
871 for (j = 0; j < i; j++)
872 inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
873 kfree(net->ipv6.icmp_sk);
877 static void __net_exit icmpv6_sk_exit(struct net *net)
881 for_each_possible_cpu(i) {
882 inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
884 kfree(net->ipv6.icmp_sk);
887 static struct pernet_operations icmpv6_sk_ops = {
888 .init = icmpv6_sk_init,
889 .exit = icmpv6_sk_exit,
892 int __init icmpv6_init(void)
896 err = register_pernet_subsys(&icmpv6_sk_ops);
901 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
904 err = inet6_register_icmp_sender(icmp6_send);
910 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
912 pr_err("Failed to register ICMP6 protocol\n");
913 unregister_pernet_subsys(&icmpv6_sk_ops);
917 void icmpv6_cleanup(void)
919 inet6_unregister_icmp_sender(icmp6_send);
920 unregister_pernet_subsys(&icmpv6_sk_ops);
921 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
925 static const struct icmp6_err {
933 { /* ADM_PROHIBITED */
937 { /* Was NOT_NEIGHBOUR, now reserved */
959 int icmpv6_err_convert(u8 type, u8 code, int *err)
966 case ICMPV6_DEST_UNREACH:
968 if (code < ARRAY_SIZE(tab_unreach)) {
969 *err = tab_unreach[code].err;
970 fatal = tab_unreach[code].fatal;
974 case ICMPV6_PKT_TOOBIG:
978 case ICMPV6_PARAMPROB:
983 case ICMPV6_TIME_EXCEED:
990 EXPORT_SYMBOL(icmpv6_err_convert);
993 ctl_table ipv6_icmp_table_template[] = {
995 .procname = "ratelimit",
996 .data = &init_net.ipv6.sysctl.icmpv6_time,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec_ms_jiffies,
1004 struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
1006 struct ctl_table *table;
1008 table = kmemdup(ipv6_icmp_table_template,
1009 sizeof(ipv6_icmp_table_template),
1013 table[0].data = &net->ipv6.sysctl.icmpv6_time;