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>
70 #include <net/dsfield.h>
71 #include <net/l3mdev.h>
73 #include <asm/uaccess.h>
76 * The ICMP socket(s). This is the most convenient way to flow control
77 * our ICMP output as well as maintain a clean interface throughout
78 * all layers. All Socketless IP sends will soon be gone.
80 * On SMP we have one ICMP socket per-cpu.
82 static inline struct sock
*icmpv6_sk(struct net
*net
)
84 return net
->ipv6
.icmp_sk
[smp_processor_id()];
87 static void icmpv6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
88 u8 type
, u8 code
, int offset
, __be32 info
)
90 /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
91 struct icmp6hdr
*icmp6
= (struct icmp6hdr
*) (skb
->data
+ offset
);
92 struct net
*net
= dev_net(skb
->dev
);
94 if (type
== ICMPV6_PKT_TOOBIG
)
95 ip6_update_pmtu(skb
, net
, info
, 0, 0);
96 else if (type
== NDISC_REDIRECT
)
97 ip6_redirect(skb
, net
, skb
->dev
->ifindex
, 0);
99 if (!(type
& ICMPV6_INFOMSG_MASK
))
100 if (icmp6
->icmp6_type
== ICMPV6_ECHO_REQUEST
)
101 ping_err(skb
, offset
, info
);
104 static int icmpv6_rcv(struct sk_buff
*skb
);
106 static const struct inet6_protocol icmpv6_protocol
= {
107 .handler
= icmpv6_rcv
,
108 .err_handler
= icmpv6_err
,
109 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
112 static __inline__
struct sock
*icmpv6_xmit_lock(struct net
*net
)
119 if (unlikely(!spin_trylock(&sk
->sk_lock
.slock
))) {
120 /* This can happen if the output path (f.e. SIT or
121 * ip6ip6 tunnel) signals dst_link_failure() for an
122 * outgoing ICMP6 packet.
130 static __inline__
void icmpv6_xmit_unlock(struct sock
*sk
)
132 spin_unlock_bh(&sk
->sk_lock
.slock
);
136 * Figure out, may we reply to this packet with icmp error.
138 * We do not reply, if:
139 * - it was icmp error message.
140 * - it is truncated, so that it is known, that protocol is ICMPV6
141 * (i.e. in the middle of some exthdr)
146 static bool is_ineligible(const struct sk_buff
*skb
)
148 int ptr
= (u8
*)(ipv6_hdr(skb
) + 1) - skb
->data
;
149 int len
= skb
->len
- ptr
;
150 __u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
156 ptr
= ipv6_skip_exthdr(skb
, ptr
, &nexthdr
, &frag_off
);
159 if (nexthdr
== IPPROTO_ICMPV6
) {
161 tp
= skb_header_pointer(skb
,
162 ptr
+offsetof(struct icmp6hdr
, icmp6_type
),
163 sizeof(_type
), &_type
);
164 if (!tp
|| !(*tp
& ICMPV6_INFOMSG_MASK
))
171 * Check the ICMP output rate limit
173 static bool icmpv6_xrlim_allow(struct sock
*sk
, u8 type
,
176 struct net
*net
= sock_net(sk
);
177 struct dst_entry
*dst
;
180 /* Informational messages are not limited. */
181 if (type
& ICMPV6_INFOMSG_MASK
)
184 /* Do not limit pmtu discovery, it would break it. */
185 if (type
== ICMPV6_PKT_TOOBIG
)
189 * Look up the output route.
190 * XXX: perhaps the expire for routing entries cloned by
191 * this lookup should be more aggressive (not longer than timeout).
193 dst
= ip6_route_output(net
, sk
, fl6
);
195 IP6_INC_STATS(net
, ip6_dst_idev(dst
),
196 IPSTATS_MIB_OUTNOROUTES
);
197 } else if (dst
->dev
&& (dst
->dev
->flags
&IFF_LOOPBACK
)) {
200 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
201 int tmo
= net
->ipv6
.sysctl
.icmpv6_time
;
203 /* Give more bandwidth to wider prefixes. */
204 if (rt
->rt6i_dst
.plen
< 128)
205 tmo
>>= ((128 - rt
->rt6i_dst
.plen
)>>5);
207 if (icmp_global_allow()) {
208 struct inet_peer
*peer
;
210 peer
= inet_getpeer_v6(net
->ipv6
.peers
,
212 res
= inet_peer_xrlim_allow(peer
, tmo
);
222 * an inline helper for the "simple" if statement below
223 * checks if parameter problem report is caused by an
224 * unrecognized IPv6 option that has the Option Type
225 * highest-order two bits set to 10
228 static bool opt_unrec(struct sk_buff
*skb
, __u32 offset
)
232 offset
+= skb_network_offset(skb
);
233 op
= skb_header_pointer(skb
, offset
, sizeof(_optval
), &_optval
);
236 return (*op
& 0xC0) == 0x80;
239 int icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
240 struct icmp6hdr
*thdr
, int len
)
243 struct icmp6hdr
*icmp6h
;
246 skb
= skb_peek(&sk
->sk_write_queue
);
250 icmp6h
= icmp6_hdr(skb
);
251 memcpy(icmp6h
, thdr
, sizeof(struct icmp6hdr
));
252 icmp6h
->icmp6_cksum
= 0;
254 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
255 skb
->csum
= csum_partial(icmp6h
,
256 sizeof(struct icmp6hdr
), skb
->csum
);
257 icmp6h
->icmp6_cksum
= csum_ipv6_magic(&fl6
->saddr
,
259 len
, fl6
->flowi6_proto
,
264 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
265 tmp_csum
= csum_add(tmp_csum
, skb
->csum
);
268 tmp_csum
= csum_partial(icmp6h
,
269 sizeof(struct icmp6hdr
), tmp_csum
);
270 icmp6h
->icmp6_cksum
= csum_ipv6_magic(&fl6
->saddr
,
272 len
, fl6
->flowi6_proto
,
275 ip6_push_pending_frames(sk
);
286 static int icmpv6_getfrag(void *from
, char *to
, int offset
, int len
, int odd
, struct sk_buff
*skb
)
288 struct icmpv6_msg
*msg
= (struct icmpv6_msg
*) from
;
289 struct sk_buff
*org_skb
= msg
->skb
;
292 csum
= skb_copy_and_csum_bits(org_skb
, msg
->offset
+ offset
,
294 skb
->csum
= csum_block_add(skb
->csum
, csum
, odd
);
295 if (!(msg
->type
& ICMPV6_INFOMSG_MASK
))
296 nf_ct_attach(skb
, org_skb
);
300 #if IS_ENABLED(CONFIG_IPV6_MIP6)
301 static void mip6_addr_swap(struct sk_buff
*skb
)
303 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
304 struct inet6_skb_parm
*opt
= IP6CB(skb
);
305 struct ipv6_destopt_hao
*hao
;
310 off
= ipv6_find_tlv(skb
, opt
->dsthao
, IPV6_TLV_HAO
);
311 if (likely(off
>= 0)) {
312 hao
= (struct ipv6_destopt_hao
*)
313 (skb_network_header(skb
) + off
);
315 iph
->saddr
= hao
->addr
;
321 static inline void mip6_addr_swap(struct sk_buff
*skb
) {}
324 static struct dst_entry
*icmpv6_route_lookup(struct net
*net
,
329 struct dst_entry
*dst
, *dst2
;
333 err
= ip6_dst_lookup(net
, sk
, &dst
, fl6
);
338 * We won't send icmp if the destination is known
341 if (ipv6_anycast_destination(dst
, &fl6
->daddr
)) {
342 net_dbg_ratelimited("icmp6_send: acast source\n");
344 return ERR_PTR(-EINVAL
);
347 /* No need to clone since we're just using its address. */
350 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(fl6
), sk
, 0);
355 if (PTR_ERR(dst
) == -EPERM
)
361 err
= xfrm_decode_session_reverse(skb
, flowi6_to_flowi(&fl2
), AF_INET6
);
363 goto relookup_failed
;
365 err
= ip6_dst_lookup(net
, sk
, &dst2
, &fl2
);
367 goto relookup_failed
;
369 dst2
= xfrm_lookup(net
, dst2
, flowi6_to_flowi(&fl2
), sk
, XFRM_LOOKUP_ICMP
);
379 goto relookup_failed
;
389 * Send an ICMP message in response to a packet in error
391 static void icmp6_send(struct sk_buff
*skb
, u8 type
, u8 code
, __u32 info
,
392 const struct in6_addr
*force_saddr
)
394 struct net
*net
= dev_net(skb
->dev
);
395 struct inet6_dev
*idev
= NULL
;
396 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
398 struct ipv6_pinfo
*np
;
399 const struct in6_addr
*saddr
= NULL
;
400 struct dst_entry
*dst
;
401 struct icmp6hdr tmp_hdr
;
403 struct icmpv6_msg msg
;
404 struct sockcm_cookie sockc_unused
= {0};
405 struct ipcm6_cookie ipc6
;
410 u32 mark
= IP6_REPLY_MARK(net
, skb
->mark
);
412 if ((u8
*)hdr
< skb
->head
||
413 (skb_network_header(skb
) + sizeof(*hdr
)) > skb_tail_pointer(skb
))
417 * Make sure we respect the rules
418 * i.e. RFC 1885 2.4(e)
419 * Rule (e.1) is enforced by not using icmp6_send
420 * in any code that processes icmp errors.
422 addr_type
= ipv6_addr_type(&hdr
->daddr
);
424 if (ipv6_chk_addr(net
, &hdr
->daddr
, skb
->dev
, 0) ||
425 ipv6_chk_acast_addr_src(net
, skb
->dev
, &hdr
->daddr
))
432 if (addr_type
& IPV6_ADDR_MULTICAST
|| skb
->pkt_type
!= PACKET_HOST
) {
433 if (type
!= ICMPV6_PKT_TOOBIG
&&
434 !(type
== ICMPV6_PARAMPROB
&&
435 code
== ICMPV6_UNK_OPTION
&&
436 (opt_unrec(skb
, info
))))
442 addr_type
= ipv6_addr_type(&hdr
->saddr
);
448 if (__ipv6_addr_needs_scope_id(addr_type
))
449 iif
= skb
->dev
->ifindex
;
451 iif
= l3mdev_master_ifindex(skb
->dev
);
454 * Must not send error if the source does not uniquely
455 * identify a single node (RFC2463 Section 2.4).
456 * We check unspecified / multicast addresses here,
457 * and anycast addresses will be checked later.
459 if ((addr_type
== IPV6_ADDR_ANY
) || (addr_type
& IPV6_ADDR_MULTICAST
)) {
460 net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
461 &hdr
->saddr
, &hdr
->daddr
);
466 * Never answer to a ICMP packet.
468 if (is_ineligible(skb
)) {
469 net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
470 &hdr
->saddr
, &hdr
->daddr
);
476 memset(&fl6
, 0, sizeof(fl6
));
477 fl6
.flowi6_proto
= IPPROTO_ICMPV6
;
478 fl6
.daddr
= hdr
->saddr
;
483 fl6
.flowi6_mark
= mark
;
484 fl6
.flowi6_oif
= iif
;
485 fl6
.fl6_icmp_type
= type
;
486 fl6
.fl6_icmp_code
= code
;
487 security_skb_classify_flow(skb
, flowi6_to_flowi(&fl6
));
489 sk
= icmpv6_xmit_lock(net
);
495 if (!icmpv6_xrlim_allow(sk
, type
, &fl6
))
498 tmp_hdr
.icmp6_type
= type
;
499 tmp_hdr
.icmp6_code
= code
;
500 tmp_hdr
.icmp6_cksum
= 0;
501 tmp_hdr
.icmp6_pointer
= htonl(info
);
503 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
504 fl6
.flowi6_oif
= np
->mcast_oif
;
505 else if (!fl6
.flowi6_oif
)
506 fl6
.flowi6_oif
= np
->ucast_oif
;
508 ipc6
.tclass
= np
->tclass
;
509 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
511 dst
= icmpv6_route_lookup(net
, skb
, sk
, &fl6
);
515 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
516 ipc6
.dontfrag
= np
->dontfrag
;
520 msg
.offset
= skb_network_offset(skb
);
523 len
= skb
->len
- msg
.offset
;
524 len
= min_t(unsigned int, len
, IPV6_MIN_MTU
- sizeof(struct ipv6hdr
) - sizeof(struct icmp6hdr
));
526 net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
527 &hdr
->saddr
, &hdr
->daddr
);
528 goto out_dst_release
;
532 idev
= __in6_dev_get(skb
->dev
);
534 err
= ip6_append_data(sk
, icmpv6_getfrag
, &msg
,
535 len
+ sizeof(struct icmp6hdr
),
536 sizeof(struct icmp6hdr
),
537 &ipc6
, &fl6
, (struct rt6_info
*)dst
,
538 MSG_DONTWAIT
, &sockc_unused
);
540 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTERRORS
);
541 ip6_flush_pending_frames(sk
);
543 err
= icmpv6_push_pending_frames(sk
, &fl6
, &tmp_hdr
,
544 len
+ sizeof(struct icmp6hdr
));
550 icmpv6_xmit_unlock(sk
);
553 /* Slightly more convenient version of icmp6_send.
555 void icmpv6_param_prob(struct sk_buff
*skb
, u8 code
, int pos
)
557 icmp6_send(skb
, ICMPV6_PARAMPROB
, code
, pos
, NULL
);
561 static void icmpv6_echo_reply(struct sk_buff
*skb
)
563 struct net
*net
= dev_net(skb
->dev
);
565 struct inet6_dev
*idev
;
566 struct ipv6_pinfo
*np
;
567 const struct in6_addr
*saddr
= NULL
;
568 struct icmp6hdr
*icmph
= icmp6_hdr(skb
);
569 struct icmp6hdr tmp_hdr
;
571 struct icmpv6_msg msg
;
572 struct dst_entry
*dst
;
573 struct ipcm6_cookie ipc6
;
575 u32 mark
= IP6_REPLY_MARK(net
, skb
->mark
);
576 struct sockcm_cookie sockc_unused
= {0};
578 saddr
= &ipv6_hdr(skb
)->daddr
;
580 if (!ipv6_unicast_destination(skb
) &&
581 !(net
->ipv6
.sysctl
.anycast_src_echo_reply
&&
582 ipv6_anycast_destination(skb_dst(skb
), saddr
)))
585 memcpy(&tmp_hdr
, icmph
, sizeof(tmp_hdr
));
586 tmp_hdr
.icmp6_type
= ICMPV6_ECHO_REPLY
;
588 memset(&fl6
, 0, sizeof(fl6
));
589 fl6
.flowi6_proto
= IPPROTO_ICMPV6
;
590 fl6
.daddr
= ipv6_hdr(skb
)->saddr
;
593 fl6
.flowi6_oif
= skb
->dev
->ifindex
;
594 fl6
.fl6_icmp_type
= ICMPV6_ECHO_REPLY
;
595 fl6
.flowi6_mark
= mark
;
596 security_skb_classify_flow(skb
, flowi6_to_flowi(&fl6
));
598 sk
= icmpv6_xmit_lock(net
);
604 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
605 fl6
.flowi6_oif
= np
->mcast_oif
;
606 else if (!fl6
.flowi6_oif
)
607 fl6
.flowi6_oif
= np
->ucast_oif
;
609 err
= ip6_dst_lookup(net
, sk
, &dst
, &fl6
);
612 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(&fl6
), sk
, 0);
616 idev
= __in6_dev_get(skb
->dev
);
620 msg
.type
= ICMPV6_ECHO_REPLY
;
622 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
623 ipc6
.tclass
= ipv6_get_dsfield(ipv6_hdr(skb
));
624 ipc6
.dontfrag
= np
->dontfrag
;
627 err
= ip6_append_data(sk
, icmpv6_getfrag
, &msg
, skb
->len
+ sizeof(struct icmp6hdr
),
628 sizeof(struct icmp6hdr
), &ipc6
, &fl6
,
629 (struct rt6_info
*)dst
, MSG_DONTWAIT
,
633 __ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTERRORS
);
634 ip6_flush_pending_frames(sk
);
636 err
= icmpv6_push_pending_frames(sk
, &fl6
, &tmp_hdr
,
637 skb
->len
+ sizeof(struct icmp6hdr
));
641 icmpv6_xmit_unlock(sk
);
644 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
)
646 const struct inet6_protocol
*ipprot
;
650 struct net
*net
= dev_net(skb
->dev
);
652 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
655 nexthdr
= ((struct ipv6hdr
*)skb
->data
)->nexthdr
;
656 if (ipv6_ext_hdr(nexthdr
)) {
657 /* now skip over extension headers */
658 inner_offset
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
),
659 &nexthdr
, &frag_off
);
660 if (inner_offset
< 0)
663 inner_offset
= sizeof(struct ipv6hdr
);
666 /* Checkin header including 8 bytes of inner protocol header. */
667 if (!pskb_may_pull(skb
, inner_offset
+8))
670 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
671 Without this we will not able f.e. to make source routed
673 Corresponding argument (opt) to notifiers is already added.
677 ipprot
= rcu_dereference(inet6_protos
[nexthdr
]);
678 if (ipprot
&& ipprot
->err_handler
)
679 ipprot
->err_handler(skb
, NULL
, type
, code
, inner_offset
, info
);
681 raw6_icmp_error(skb
, nexthdr
, type
, code
, inner_offset
, info
);
685 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
689 * Handle icmp messages
692 static int icmpv6_rcv(struct sk_buff
*skb
)
694 struct net_device
*dev
= skb
->dev
;
695 struct inet6_dev
*idev
= __in6_dev_get(dev
);
696 const struct in6_addr
*saddr
, *daddr
;
697 struct icmp6hdr
*hdr
;
699 bool success
= false;
701 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
702 struct sec_path
*sp
= skb_sec_path(skb
);
705 if (!(sp
&& sp
->xvec
[sp
->len
- 1]->props
.flags
&
709 if (!pskb_may_pull(skb
, sizeof(*hdr
) + sizeof(struct ipv6hdr
)))
712 nh
= skb_network_offset(skb
);
713 skb_set_network_header(skb
, sizeof(*hdr
));
715 if (!xfrm6_policy_check_reverse(NULL
, XFRM_POLICY_IN
, skb
))
718 skb_set_network_header(skb
, nh
);
721 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_INMSGS
);
723 saddr
= &ipv6_hdr(skb
)->saddr
;
724 daddr
= &ipv6_hdr(skb
)->daddr
;
726 if (skb_checksum_validate(skb
, IPPROTO_ICMPV6
, ip6_compute_pseudo
)) {
727 net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
732 if (!pskb_pull(skb
, sizeof(*hdr
)))
735 hdr
= icmp6_hdr(skb
);
737 type
= hdr
->icmp6_type
;
739 ICMP6MSGIN_INC_STATS(dev_net(dev
), idev
, type
);
742 case ICMPV6_ECHO_REQUEST
:
743 icmpv6_echo_reply(skb
);
746 case ICMPV6_ECHO_REPLY
:
747 success
= ping_rcv(skb
);
750 case ICMPV6_PKT_TOOBIG
:
751 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
752 standard destination cache. Seems, only "advanced"
753 destination cache will allow to solve this problem
756 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
758 hdr
= icmp6_hdr(skb
);
761 * Drop through to notify
764 case ICMPV6_DEST_UNREACH
:
765 case ICMPV6_TIME_EXCEED
:
766 case ICMPV6_PARAMPROB
:
767 icmpv6_notify(skb
, type
, hdr
->icmp6_code
, hdr
->icmp6_mtu
);
770 case NDISC_ROUTER_SOLICITATION
:
771 case NDISC_ROUTER_ADVERTISEMENT
:
772 case NDISC_NEIGHBOUR_SOLICITATION
:
773 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
778 case ICMPV6_MGM_QUERY
:
779 igmp6_event_query(skb
);
782 case ICMPV6_MGM_REPORT
:
783 igmp6_event_report(skb
);
786 case ICMPV6_MGM_REDUCTION
:
787 case ICMPV6_NI_QUERY
:
788 case ICMPV6_NI_REPLY
:
789 case ICMPV6_MLD2_REPORT
:
790 case ICMPV6_DHAAD_REQUEST
:
791 case ICMPV6_DHAAD_REPLY
:
792 case ICMPV6_MOBILE_PREFIX_SOL
:
793 case ICMPV6_MOBILE_PREFIX_ADV
:
798 if (type
& ICMPV6_INFOMSG_MASK
)
801 net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
805 * error of unknown type.
806 * must pass to upper level
809 icmpv6_notify(skb
, type
, hdr
->icmp6_code
, hdr
->icmp6_mtu
);
812 /* until the v6 path can be better sorted assume failure and
813 * preserve the status quo behaviour for the rest of the paths to here
823 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_CSUMERRORS
);
825 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_INERRORS
);
831 void icmpv6_flow_init(struct sock
*sk
, struct flowi6
*fl6
,
833 const struct in6_addr
*saddr
,
834 const struct in6_addr
*daddr
,
837 memset(fl6
, 0, sizeof(*fl6
));
840 fl6
->flowi6_proto
= IPPROTO_ICMPV6
;
841 fl6
->fl6_icmp_type
= type
;
842 fl6
->fl6_icmp_code
= 0;
843 fl6
->flowi6_oif
= oif
;
844 security_sk_classify_flow(sk
, flowi6_to_flowi(fl6
));
847 static int __net_init
icmpv6_sk_init(struct net
*net
)
853 kzalloc(nr_cpu_ids
* sizeof(struct sock
*), GFP_KERNEL
);
854 if (!net
->ipv6
.icmp_sk
)
857 for_each_possible_cpu(i
) {
858 err
= inet_ctl_sock_create(&sk
, PF_INET6
,
859 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
861 pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
866 net
->ipv6
.icmp_sk
[i
] = sk
;
868 /* Enough space for 2 64K ICMP packets, including
869 * sk_buff struct overhead.
871 sk
->sk_sndbuf
= 2 * SKB_TRUESIZE(64 * 1024);
876 for (j
= 0; j
< i
; j
++)
877 inet_ctl_sock_destroy(net
->ipv6
.icmp_sk
[j
]);
878 kfree(net
->ipv6
.icmp_sk
);
882 static void __net_exit
icmpv6_sk_exit(struct net
*net
)
886 for_each_possible_cpu(i
) {
887 inet_ctl_sock_destroy(net
->ipv6
.icmp_sk
[i
]);
889 kfree(net
->ipv6
.icmp_sk
);
892 static struct pernet_operations icmpv6_sk_ops
= {
893 .init
= icmpv6_sk_init
,
894 .exit
= icmpv6_sk_exit
,
897 int __init
icmpv6_init(void)
901 err
= register_pernet_subsys(&icmpv6_sk_ops
);
906 if (inet6_add_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
) < 0)
909 err
= inet6_register_icmp_sender(icmp6_send
);
915 inet6_del_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
);
917 pr_err("Failed to register ICMP6 protocol\n");
918 unregister_pernet_subsys(&icmpv6_sk_ops
);
922 void icmpv6_cleanup(void)
924 inet6_unregister_icmp_sender(icmp6_send
);
925 unregister_pernet_subsys(&icmpv6_sk_ops
);
926 inet6_del_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
);
930 static const struct icmp6_err
{
938 { /* ADM_PROHIBITED */
942 { /* Was NOT_NEIGHBOUR, now reserved */
964 int icmpv6_err_convert(u8 type
, u8 code
, int *err
)
971 case ICMPV6_DEST_UNREACH
:
973 if (code
< ARRAY_SIZE(tab_unreach
)) {
974 *err
= tab_unreach
[code
].err
;
975 fatal
= tab_unreach
[code
].fatal
;
979 case ICMPV6_PKT_TOOBIG
:
983 case ICMPV6_PARAMPROB
:
988 case ICMPV6_TIME_EXCEED
:
995 EXPORT_SYMBOL(icmpv6_err_convert
);
998 static struct ctl_table ipv6_icmp_table_template
[] = {
1000 .procname
= "ratelimit",
1001 .data
= &init_net
.ipv6
.sysctl
.icmpv6_time
,
1002 .maxlen
= sizeof(int),
1004 .proc_handler
= proc_dointvec_ms_jiffies
,
1009 struct ctl_table
* __net_init
ipv6_icmp_sysctl_init(struct net
*net
)
1011 struct ctl_table
*table
;
1013 table
= kmemdup(ipv6_icmp_table_template
,
1014 sizeof(ipv6_icmp_table_template
),
1018 table
[0].data
= &net
->ipv6
.sysctl
.icmpv6_time
;