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
, ntohl(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
;
452 iif
= l3mdev_master_ifindex(dst
? dst
->dev
: skb
->dev
);
456 * Must not send error if the source does not uniquely
457 * identify a single node (RFC2463 Section 2.4).
458 * We check unspecified / multicast addresses here,
459 * and anycast addresses will be checked later.
461 if ((addr_type
== IPV6_ADDR_ANY
) || (addr_type
& IPV6_ADDR_MULTICAST
)) {
462 net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
463 &hdr
->saddr
, &hdr
->daddr
);
468 * Never answer to a ICMP packet.
470 if (is_ineligible(skb
)) {
471 net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
472 &hdr
->saddr
, &hdr
->daddr
);
478 memset(&fl6
, 0, sizeof(fl6
));
479 fl6
.flowi6_proto
= IPPROTO_ICMPV6
;
480 fl6
.daddr
= hdr
->saddr
;
485 fl6
.flowi6_mark
= mark
;
486 fl6
.flowi6_oif
= iif
;
487 fl6
.fl6_icmp_type
= type
;
488 fl6
.fl6_icmp_code
= code
;
489 security_skb_classify_flow(skb
, flowi6_to_flowi(&fl6
));
491 sk
= icmpv6_xmit_lock(net
);
497 if (!icmpv6_xrlim_allow(sk
, type
, &fl6
))
500 tmp_hdr
.icmp6_type
= type
;
501 tmp_hdr
.icmp6_code
= code
;
502 tmp_hdr
.icmp6_cksum
= 0;
503 tmp_hdr
.icmp6_pointer
= htonl(info
);
505 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
506 fl6
.flowi6_oif
= np
->mcast_oif
;
507 else if (!fl6
.flowi6_oif
)
508 fl6
.flowi6_oif
= np
->ucast_oif
;
510 ipc6
.tclass
= np
->tclass
;
511 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
513 dst
= icmpv6_route_lookup(net
, skb
, sk
, &fl6
);
517 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
518 ipc6
.dontfrag
= np
->dontfrag
;
522 msg
.offset
= skb_network_offset(skb
);
525 len
= skb
->len
- msg
.offset
;
526 len
= min_t(unsigned int, len
, IPV6_MIN_MTU
- sizeof(struct ipv6hdr
) - sizeof(struct icmp6hdr
));
528 net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
529 &hdr
->saddr
, &hdr
->daddr
);
530 goto out_dst_release
;
534 idev
= __in6_dev_get(skb
->dev
);
536 err
= ip6_append_data(sk
, icmpv6_getfrag
, &msg
,
537 len
+ sizeof(struct icmp6hdr
),
538 sizeof(struct icmp6hdr
),
539 &ipc6
, &fl6
, (struct rt6_info
*)dst
,
540 MSG_DONTWAIT
, &sockc_unused
);
542 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTERRORS
);
543 ip6_flush_pending_frames(sk
);
545 err
= icmpv6_push_pending_frames(sk
, &fl6
, &tmp_hdr
,
546 len
+ sizeof(struct icmp6hdr
));
552 icmpv6_xmit_unlock(sk
);
555 /* Slightly more convenient version of icmp6_send.
557 void icmpv6_param_prob(struct sk_buff
*skb
, u8 code
, int pos
)
559 icmp6_send(skb
, ICMPV6_PARAMPROB
, code
, pos
, NULL
);
563 /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
564 * if sufficient data bytes are available
565 * @nhs is the size of the tunnel header(s) :
566 * Either an IPv4 header for SIT encap
567 * an IPv4 header + GRE header for GRE encap
569 int ip6_err_gen_icmpv6_unreach(struct sk_buff
*skb
, int nhs
, int type
,
570 unsigned int data_len
)
572 struct in6_addr temp_saddr
;
574 struct sk_buff
*skb2
;
577 if (!pskb_may_pull(skb
, nhs
+ sizeof(struct ipv6hdr
) + 8))
580 /* RFC 4884 (partial) support for ICMP extensions */
581 if (data_len
< 128 || (data_len
& 7) || skb
->len
< data_len
)
584 skb2
= data_len
? skb_copy(skb
, GFP_ATOMIC
) : skb_clone(skb
, GFP_ATOMIC
);
591 skb_reset_network_header(skb2
);
593 rt
= rt6_lookup(dev_net(skb
->dev
), &ipv6_hdr(skb2
)->saddr
, NULL
, 0, 0);
595 if (rt
&& rt
->dst
.dev
)
596 skb2
->dev
= rt
->dst
.dev
;
598 ipv6_addr_set_v4mapped(ip_hdr(skb
)->saddr
, &temp_saddr
);
601 /* RFC 4884 (partial) support :
602 * insert 0 padding at the end, before the extensions
604 __skb_push(skb2
, nhs
);
605 skb_reset_network_header(skb2
);
606 memmove(skb2
->data
, skb2
->data
+ nhs
, data_len
- nhs
);
607 memset(skb2
->data
+ data_len
- nhs
, 0, nhs
);
608 /* RFC 4884 4.5 : Length is measured in 64-bit words,
609 * and stored in reserved[0]
611 info
= (data_len
/8) << 24;
613 if (type
== ICMP_TIME_EXCEEDED
)
614 icmp6_send(skb2
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_HOPLIMIT
,
617 icmp6_send(skb2
, ICMPV6_DEST_UNREACH
, ICMPV6_ADDR_UNREACH
,
626 EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach
);
628 static void icmpv6_echo_reply(struct sk_buff
*skb
)
630 struct net
*net
= dev_net(skb
->dev
);
632 struct inet6_dev
*idev
;
633 struct ipv6_pinfo
*np
;
634 const struct in6_addr
*saddr
= NULL
;
635 struct icmp6hdr
*icmph
= icmp6_hdr(skb
);
636 struct icmp6hdr tmp_hdr
;
638 struct icmpv6_msg msg
;
639 struct dst_entry
*dst
;
640 struct ipcm6_cookie ipc6
;
642 u32 mark
= IP6_REPLY_MARK(net
, skb
->mark
);
643 struct sockcm_cookie sockc_unused
= {0};
645 saddr
= &ipv6_hdr(skb
)->daddr
;
647 if (!ipv6_unicast_destination(skb
) &&
648 !(net
->ipv6
.sysctl
.anycast_src_echo_reply
&&
649 ipv6_anycast_destination(skb_dst(skb
), saddr
)))
652 memcpy(&tmp_hdr
, icmph
, sizeof(tmp_hdr
));
653 tmp_hdr
.icmp6_type
= ICMPV6_ECHO_REPLY
;
655 memset(&fl6
, 0, sizeof(fl6
));
656 fl6
.flowi6_proto
= IPPROTO_ICMPV6
;
657 fl6
.daddr
= ipv6_hdr(skb
)->saddr
;
660 fl6
.flowi6_oif
= skb
->dev
->ifindex
;
661 fl6
.fl6_icmp_type
= ICMPV6_ECHO_REPLY
;
662 fl6
.flowi6_mark
= mark
;
663 security_skb_classify_flow(skb
, flowi6_to_flowi(&fl6
));
665 sk
= icmpv6_xmit_lock(net
);
671 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
672 fl6
.flowi6_oif
= np
->mcast_oif
;
673 else if (!fl6
.flowi6_oif
)
674 fl6
.flowi6_oif
= np
->ucast_oif
;
676 err
= ip6_dst_lookup(net
, sk
, &dst
, &fl6
);
679 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(&fl6
), sk
, 0);
683 idev
= __in6_dev_get(skb
->dev
);
687 msg
.type
= ICMPV6_ECHO_REPLY
;
689 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
690 ipc6
.tclass
= ipv6_get_dsfield(ipv6_hdr(skb
));
691 ipc6
.dontfrag
= np
->dontfrag
;
694 err
= ip6_append_data(sk
, icmpv6_getfrag
, &msg
, skb
->len
+ sizeof(struct icmp6hdr
),
695 sizeof(struct icmp6hdr
), &ipc6
, &fl6
,
696 (struct rt6_info
*)dst
, MSG_DONTWAIT
,
700 __ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTERRORS
);
701 ip6_flush_pending_frames(sk
);
703 err
= icmpv6_push_pending_frames(sk
, &fl6
, &tmp_hdr
,
704 skb
->len
+ sizeof(struct icmp6hdr
));
708 icmpv6_xmit_unlock(sk
);
711 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
)
713 const struct inet6_protocol
*ipprot
;
717 struct net
*net
= dev_net(skb
->dev
);
719 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
722 nexthdr
= ((struct ipv6hdr
*)skb
->data
)->nexthdr
;
723 if (ipv6_ext_hdr(nexthdr
)) {
724 /* now skip over extension headers */
725 inner_offset
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
),
726 &nexthdr
, &frag_off
);
727 if (inner_offset
< 0)
730 inner_offset
= sizeof(struct ipv6hdr
);
733 /* Checkin header including 8 bytes of inner protocol header. */
734 if (!pskb_may_pull(skb
, inner_offset
+8))
737 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
738 Without this we will not able f.e. to make source routed
740 Corresponding argument (opt) to notifiers is already added.
744 ipprot
= rcu_dereference(inet6_protos
[nexthdr
]);
745 if (ipprot
&& ipprot
->err_handler
)
746 ipprot
->err_handler(skb
, NULL
, type
, code
, inner_offset
, info
);
748 raw6_icmp_error(skb
, nexthdr
, type
, code
, inner_offset
, info
);
752 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
756 * Handle icmp messages
759 static int icmpv6_rcv(struct sk_buff
*skb
)
761 struct net_device
*dev
= skb
->dev
;
762 struct inet6_dev
*idev
= __in6_dev_get(dev
);
763 const struct in6_addr
*saddr
, *daddr
;
764 struct icmp6hdr
*hdr
;
766 bool success
= false;
768 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
769 struct sec_path
*sp
= skb_sec_path(skb
);
772 if (!(sp
&& sp
->xvec
[sp
->len
- 1]->props
.flags
&
776 if (!pskb_may_pull(skb
, sizeof(*hdr
) + sizeof(struct ipv6hdr
)))
779 nh
= skb_network_offset(skb
);
780 skb_set_network_header(skb
, sizeof(*hdr
));
782 if (!xfrm6_policy_check_reverse(NULL
, XFRM_POLICY_IN
, skb
))
785 skb_set_network_header(skb
, nh
);
788 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_INMSGS
);
790 saddr
= &ipv6_hdr(skb
)->saddr
;
791 daddr
= &ipv6_hdr(skb
)->daddr
;
793 if (skb_checksum_validate(skb
, IPPROTO_ICMPV6
, ip6_compute_pseudo
)) {
794 net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
799 if (!pskb_pull(skb
, sizeof(*hdr
)))
802 hdr
= icmp6_hdr(skb
);
804 type
= hdr
->icmp6_type
;
806 ICMP6MSGIN_INC_STATS(dev_net(dev
), idev
, type
);
809 case ICMPV6_ECHO_REQUEST
:
810 icmpv6_echo_reply(skb
);
813 case ICMPV6_ECHO_REPLY
:
814 success
= ping_rcv(skb
);
817 case ICMPV6_PKT_TOOBIG
:
818 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
819 standard destination cache. Seems, only "advanced"
820 destination cache will allow to solve this problem
823 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
825 hdr
= icmp6_hdr(skb
);
828 * Drop through to notify
831 case ICMPV6_DEST_UNREACH
:
832 case ICMPV6_TIME_EXCEED
:
833 case ICMPV6_PARAMPROB
:
834 icmpv6_notify(skb
, type
, hdr
->icmp6_code
, hdr
->icmp6_mtu
);
837 case NDISC_ROUTER_SOLICITATION
:
838 case NDISC_ROUTER_ADVERTISEMENT
:
839 case NDISC_NEIGHBOUR_SOLICITATION
:
840 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
845 case ICMPV6_MGM_QUERY
:
846 igmp6_event_query(skb
);
849 case ICMPV6_MGM_REPORT
:
850 igmp6_event_report(skb
);
853 case ICMPV6_MGM_REDUCTION
:
854 case ICMPV6_NI_QUERY
:
855 case ICMPV6_NI_REPLY
:
856 case ICMPV6_MLD2_REPORT
:
857 case ICMPV6_DHAAD_REQUEST
:
858 case ICMPV6_DHAAD_REPLY
:
859 case ICMPV6_MOBILE_PREFIX_SOL
:
860 case ICMPV6_MOBILE_PREFIX_ADV
:
865 if (type
& ICMPV6_INFOMSG_MASK
)
868 net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
872 * error of unknown type.
873 * must pass to upper level
876 icmpv6_notify(skb
, type
, hdr
->icmp6_code
, hdr
->icmp6_mtu
);
879 /* until the v6 path can be better sorted assume failure and
880 * preserve the status quo behaviour for the rest of the paths to here
890 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_CSUMERRORS
);
892 __ICMP6_INC_STATS(dev_net(dev
), idev
, ICMP6_MIB_INERRORS
);
898 void icmpv6_flow_init(struct sock
*sk
, struct flowi6
*fl6
,
900 const struct in6_addr
*saddr
,
901 const struct in6_addr
*daddr
,
904 memset(fl6
, 0, sizeof(*fl6
));
907 fl6
->flowi6_proto
= IPPROTO_ICMPV6
;
908 fl6
->fl6_icmp_type
= type
;
909 fl6
->fl6_icmp_code
= 0;
910 fl6
->flowi6_oif
= oif
;
911 security_sk_classify_flow(sk
, flowi6_to_flowi(fl6
));
914 static int __net_init
icmpv6_sk_init(struct net
*net
)
920 kzalloc(nr_cpu_ids
* sizeof(struct sock
*), GFP_KERNEL
);
921 if (!net
->ipv6
.icmp_sk
)
924 for_each_possible_cpu(i
) {
925 err
= inet_ctl_sock_create(&sk
, PF_INET6
,
926 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
928 pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
933 net
->ipv6
.icmp_sk
[i
] = sk
;
935 /* Enough space for 2 64K ICMP packets, including
936 * sk_buff struct overhead.
938 sk
->sk_sndbuf
= 2 * SKB_TRUESIZE(64 * 1024);
943 for (j
= 0; j
< i
; j
++)
944 inet_ctl_sock_destroy(net
->ipv6
.icmp_sk
[j
]);
945 kfree(net
->ipv6
.icmp_sk
);
949 static void __net_exit
icmpv6_sk_exit(struct net
*net
)
953 for_each_possible_cpu(i
) {
954 inet_ctl_sock_destroy(net
->ipv6
.icmp_sk
[i
]);
956 kfree(net
->ipv6
.icmp_sk
);
959 static struct pernet_operations icmpv6_sk_ops
= {
960 .init
= icmpv6_sk_init
,
961 .exit
= icmpv6_sk_exit
,
964 int __init
icmpv6_init(void)
968 err
= register_pernet_subsys(&icmpv6_sk_ops
);
973 if (inet6_add_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
) < 0)
976 err
= inet6_register_icmp_sender(icmp6_send
);
982 inet6_del_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
);
984 pr_err("Failed to register ICMP6 protocol\n");
985 unregister_pernet_subsys(&icmpv6_sk_ops
);
989 void icmpv6_cleanup(void)
991 inet6_unregister_icmp_sender(icmp6_send
);
992 unregister_pernet_subsys(&icmpv6_sk_ops
);
993 inet6_del_protocol(&icmpv6_protocol
, IPPROTO_ICMPV6
);
997 static const struct icmp6_err
{
1005 { /* ADM_PROHIBITED */
1009 { /* Was NOT_NEIGHBOUR, now reserved */
1010 .err
= EHOSTUNREACH
,
1013 { /* ADDR_UNREACH */
1014 .err
= EHOSTUNREACH
,
1017 { /* PORT_UNREACH */
1018 .err
= ECONNREFUSED
,
1025 { /* REJECT_ROUTE */
1031 int icmpv6_err_convert(u8 type
, u8 code
, int *err
)
1038 case ICMPV6_DEST_UNREACH
:
1040 if (code
< ARRAY_SIZE(tab_unreach
)) {
1041 *err
= tab_unreach
[code
].err
;
1042 fatal
= tab_unreach
[code
].fatal
;
1046 case ICMPV6_PKT_TOOBIG
:
1050 case ICMPV6_PARAMPROB
:
1055 case ICMPV6_TIME_EXCEED
:
1056 *err
= EHOSTUNREACH
;
1062 EXPORT_SYMBOL(icmpv6_err_convert
);
1064 #ifdef CONFIG_SYSCTL
1065 static struct ctl_table ipv6_icmp_table_template
[] = {
1067 .procname
= "ratelimit",
1068 .data
= &init_net
.ipv6
.sysctl
.icmpv6_time
,
1069 .maxlen
= sizeof(int),
1071 .proc_handler
= proc_dointvec_ms_jiffies
,
1076 struct ctl_table
* __net_init
ipv6_icmp_sysctl_init(struct net
*net
)
1078 struct ctl_table
*table
;
1080 table
= kmemdup(ipv6_icmp_table_template
,
1081 sizeof(ipv6_icmp_table_template
),
1085 table
[0].data
= &net
->ipv6
.sysctl
.icmpv6_time
;