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1/*
2 * Internet Control Message Protocol (ICMPv6)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on net/ipv4/icmp.c
9 *
10 * RFC 1885
11 *
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.
16 */
17
18/*
19 * Changes:
20 *
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
25 * fragments.
26 * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
27 * Randy Dunlap and
28 * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support
29 * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
30 */
31
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/types.h>
35#include <linux/socket.h>
36#include <linux/in.h>
37#include <linux/kernel.h>
38#include <linux/sockios.h>
39#include <linux/net.h>
40#include <linux/skbuff.h>
41#include <linux/init.h>
42#include <linux/netfilter.h>
43#include <linux/slab.h>
44
45#ifdef CONFIG_SYSCTL
46#include <linux/sysctl.h>
47#endif
48
49#include <linux/inet.h>
50#include <linux/netdevice.h>
51#include <linux/icmpv6.h>
52
53#include <net/ip.h>
54#include <net/sock.h>
55
56#include <net/ipv6.h>
57#include <net/ip6_checksum.h>
58#include <net/protocol.h>
59#include <net/raw.h>
60#include <net/rawv6.h>
61#include <net/transp_v6.h>
62#include <net/ip6_route.h>
63#include <net/addrconf.h>
64#include <net/icmp.h>
65#include <net/xfrm.h>
66#include <net/inet_common.h>
67
68#include <asm/uaccess.h>
69#include <asm/system.h>
70
71/*
72 * The ICMP socket(s). This is the most convenient way to flow control
73 * our ICMP output as well as maintain a clean interface throughout
74 * all layers. All Socketless IP sends will soon be gone.
75 *
76 * On SMP we have one ICMP socket per-cpu.
77 */
78static inline struct sock *icmpv6_sk(struct net *net)
79{
80 return net->ipv6.icmp_sk[smp_processor_id()];
81}
82
83static int icmpv6_rcv(struct sk_buff *skb);
84
85static const struct inet6_protocol icmpv6_protocol = {
86 .handler = icmpv6_rcv,
87 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
88};
89
90static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
91{
92 struct sock *sk;
93
94 local_bh_disable();
95
96 sk = icmpv6_sk(net);
97 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
98 /* This can happen if the output path (f.e. SIT or
99 * ip6ip6 tunnel) signals dst_link_failure() for an
100 * outgoing ICMP6 packet.
101 */
102 local_bh_enable();
103 return NULL;
104 }
105 return sk;
106}
107
108static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
109{
110 spin_unlock_bh(&sk->sk_lock.slock);
111}
112
113/*
114 * Slightly more convenient version of icmpv6_send.
115 */
116void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
117{
118 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
119 kfree_skb(skb);
120}
121
122/*
123 * Figure out, may we reply to this packet with icmp error.
124 *
125 * We do not reply, if:
126 * - it was icmp error message.
127 * - it is truncated, so that it is known, that protocol is ICMPV6
128 * (i.e. in the middle of some exthdr)
129 *
130 * --ANK (980726)
131 */
132
133static int is_ineligible(struct sk_buff *skb)
134{
135 int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
136 int len = skb->len - ptr;
137 __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
138
139 if (len < 0)
140 return 1;
141
142 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr);
143 if (ptr < 0)
144 return 0;
145 if (nexthdr == IPPROTO_ICMPV6) {
146 u8 _type, *tp;
147 tp = skb_header_pointer(skb,
148 ptr+offsetof(struct icmp6hdr, icmp6_type),
149 sizeof(_type), &_type);
150 if (tp == NULL ||
151 !(*tp & ICMPV6_INFOMSG_MASK))
152 return 1;
153 }
154 return 0;
155}
156
157/*
158 * Check the ICMP output rate limit
159 */
160static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
161 struct flowi6 *fl6)
162{
163 struct dst_entry *dst;
164 struct net *net = sock_net(sk);
165 bool res = false;
166
167 /* Informational messages are not limited. */
168 if (type & ICMPV6_INFOMSG_MASK)
169 return true;
170
171 /* Do not limit pmtu discovery, it would break it. */
172 if (type == ICMPV6_PKT_TOOBIG)
173 return true;
174
175 /*
176 * Look up the output route.
177 * XXX: perhaps the expire for routing entries cloned by
178 * this lookup should be more aggressive (not longer than timeout).
179 */
180 dst = ip6_route_output(net, sk, fl6);
181 if (dst->error) {
182 IP6_INC_STATS(net, ip6_dst_idev(dst),
183 IPSTATS_MIB_OUTNOROUTES);
184 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
185 res = true;
186 } else {
187 struct rt6_info *rt = (struct rt6_info *)dst;
188 int tmo = net->ipv6.sysctl.icmpv6_time;
189
190 /* Give more bandwidth to wider prefixes. */
191 if (rt->rt6i_dst.plen < 128)
192 tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
193
194 if (!rt->rt6i_peer)
195 rt6_bind_peer(rt, 1);
196 res = inet_peer_xrlim_allow(rt->rt6i_peer, tmo);
197 }
198 dst_release(dst);
199 return res;
200}
201
202/*
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
207 */
208
209static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
210{
211 u8 _optval, *op;
212
213 offset += skb_network_offset(skb);
214 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
215 if (op == NULL)
216 return 1;
217 return (*op & 0xC0) == 0x80;
218}
219
220static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len)
221{
222 struct sk_buff *skb;
223 struct icmp6hdr *icmp6h;
224 int err = 0;
225
226 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
227 goto out;
228
229 icmp6h = icmp6_hdr(skb);
230 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
231 icmp6h->icmp6_cksum = 0;
232
233 if (skb_queue_len(&sk->sk_write_queue) == 1) {
234 skb->csum = csum_partial(icmp6h,
235 sizeof(struct icmp6hdr), skb->csum);
236 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
237 &fl6->daddr,
238 len, fl6->flowi6_proto,
239 skb->csum);
240 } else {
241 __wsum tmp_csum = 0;
242
243 skb_queue_walk(&sk->sk_write_queue, skb) {
244 tmp_csum = csum_add(tmp_csum, skb->csum);
245 }
246
247 tmp_csum = csum_partial(icmp6h,
248 sizeof(struct icmp6hdr), tmp_csum);
249 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
250 &fl6->daddr,
251 len, fl6->flowi6_proto,
252 tmp_csum);
253 }
254 ip6_push_pending_frames(sk);
255out:
256 return err;
257}
258
259struct icmpv6_msg {
260 struct sk_buff *skb;
261 int offset;
262 uint8_t type;
263};
264
265static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
266{
267 struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
268 struct sk_buff *org_skb = msg->skb;
269 __wsum csum = 0;
270
271 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
272 to, len, csum);
273 skb->csum = csum_block_add(skb->csum, csum, odd);
274 if (!(msg->type & ICMPV6_INFOMSG_MASK))
275 nf_ct_attach(skb, org_skb);
276 return 0;
277}
278
279#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
280static void mip6_addr_swap(struct sk_buff *skb)
281{
282 struct ipv6hdr *iph = ipv6_hdr(skb);
283 struct inet6_skb_parm *opt = IP6CB(skb);
284 struct ipv6_destopt_hao *hao;
285 struct in6_addr tmp;
286 int off;
287
288 if (opt->dsthao) {
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);
296 }
297 }
298}
299#else
300static inline void mip6_addr_swap(struct sk_buff *skb) {}
301#endif
302
303static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
304 struct sock *sk, struct flowi6 *fl6)
305{
306 struct dst_entry *dst, *dst2;
307 struct flowi6 fl2;
308 int err;
309
310 err = ip6_dst_lookup(sk, &dst, fl6);
311 if (err)
312 return ERR_PTR(err);
313
314 /*
315 * We won't send icmp if the destination is known
316 * anycast.
317 */
318 if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
319 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
320 dst_release(dst);
321 return ERR_PTR(-EINVAL);
322 }
323
324 /* No need to clone since we're just using its address. */
325 dst2 = dst;
326
327 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
328 if (!IS_ERR(dst)) {
329 if (dst != dst2)
330 return dst;
331 } else {
332 if (PTR_ERR(dst) == -EPERM)
333 dst = NULL;
334 else
335 return dst;
336 }
337
338 err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
339 if (err)
340 goto relookup_failed;
341
342 err = ip6_dst_lookup(sk, &dst2, &fl2);
343 if (err)
344 goto relookup_failed;
345
346 dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
347 if (!IS_ERR(dst2)) {
348 dst_release(dst);
349 dst = dst2;
350 } else {
351 err = PTR_ERR(dst2);
352 if (err == -EPERM) {
353 dst_release(dst);
354 return dst2;
355 } else
356 goto relookup_failed;
357 }
358
359relookup_failed:
360 if (dst)
361 return dst;
362 return ERR_PTR(err);
363}
364
365/*
366 * Send an ICMP message in response to a packet in error
367 */
368void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
369{
370 struct net *net = dev_net(skb->dev);
371 struct inet6_dev *idev = NULL;
372 struct ipv6hdr *hdr = ipv6_hdr(skb);
373 struct sock *sk;
374 struct ipv6_pinfo *np;
375 const struct in6_addr *saddr = NULL;
376 struct dst_entry *dst;
377 struct icmp6hdr tmp_hdr;
378 struct flowi6 fl6;
379 struct icmpv6_msg msg;
380 int iif = 0;
381 int addr_type = 0;
382 int len;
383 int hlimit;
384 int err = 0;
385
386 if ((u8 *)hdr < skb->head ||
387 (skb->network_header + sizeof(*hdr)) > skb->tail)
388 return;
389
390 /*
391 * Make sure we respect the rules
392 * i.e. RFC 1885 2.4(e)
393 * Rule (e.1) is enforced by not using icmpv6_send
394 * in any code that processes icmp errors.
395 */
396 addr_type = ipv6_addr_type(&hdr->daddr);
397
398 if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0))
399 saddr = &hdr->daddr;
400
401 /*
402 * Dest addr check
403 */
404
405 if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
406 if (type != ICMPV6_PKT_TOOBIG &&
407 !(type == ICMPV6_PARAMPROB &&
408 code == ICMPV6_UNK_OPTION &&
409 (opt_unrec(skb, info))))
410 return;
411
412 saddr = NULL;
413 }
414
415 addr_type = ipv6_addr_type(&hdr->saddr);
416
417 /*
418 * Source addr check
419 */
420
421 if (addr_type & IPV6_ADDR_LINKLOCAL)
422 iif = skb->dev->ifindex;
423
424 /*
425 * Must not send error if the source does not uniquely
426 * identify a single node (RFC2463 Section 2.4).
427 * We check unspecified / multicast addresses here,
428 * and anycast addresses will be checked later.
429 */
430 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
431 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
432 return;
433 }
434
435 /*
436 * Never answer to a ICMP packet.
437 */
438 if (is_ineligible(skb)) {
439 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
440 return;
441 }
442
443 mip6_addr_swap(skb);
444
445 memset(&fl6, 0, sizeof(fl6));
446 fl6.flowi6_proto = IPPROTO_ICMPV6;
447 ipv6_addr_copy(&fl6.daddr, &hdr->saddr);
448 if (saddr)
449 ipv6_addr_copy(&fl6.saddr, saddr);
450 fl6.flowi6_oif = iif;
451 fl6.fl6_icmp_type = type;
452 fl6.fl6_icmp_code = code;
453 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
454
455 sk = icmpv6_xmit_lock(net);
456 if (sk == NULL)
457 return;
458 np = inet6_sk(sk);
459
460 if (!icmpv6_xrlim_allow(sk, type, &fl6))
461 goto out;
462
463 tmp_hdr.icmp6_type = type;
464 tmp_hdr.icmp6_code = code;
465 tmp_hdr.icmp6_cksum = 0;
466 tmp_hdr.icmp6_pointer = htonl(info);
467
468 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
469 fl6.flowi6_oif = np->mcast_oif;
470
471 dst = icmpv6_route_lookup(net, skb, sk, &fl6);
472 if (IS_ERR(dst))
473 goto out;
474
475 if (ipv6_addr_is_multicast(&fl6.daddr))
476 hlimit = np->mcast_hops;
477 else
478 hlimit = np->hop_limit;
479 if (hlimit < 0)
480 hlimit = ip6_dst_hoplimit(dst);
481
482 msg.skb = skb;
483 msg.offset = skb_network_offset(skb);
484 msg.type = type;
485
486 len = skb->len - msg.offset;
487 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
488 if (len < 0) {
489 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n");
490 goto out_dst_release;
491 }
492
493 idev = in6_dev_get(skb->dev);
494
495 err = ip6_append_data(sk, icmpv6_getfrag, &msg,
496 len + sizeof(struct icmp6hdr),
497 sizeof(struct icmp6hdr), hlimit,
498 np->tclass, NULL, &fl6, (struct rt6_info*)dst,
499 MSG_DONTWAIT, np->dontfrag);
500 if (err) {
501 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
502 ip6_flush_pending_frames(sk);
503 goto out_put;
504 }
505 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, len + sizeof(struct icmp6hdr));
506
507out_put:
508 if (likely(idev != NULL))
509 in6_dev_put(idev);
510out_dst_release:
511 dst_release(dst);
512out:
513 icmpv6_xmit_unlock(sk);
514}
515
516EXPORT_SYMBOL(icmpv6_send);
517
518static void icmpv6_echo_reply(struct sk_buff *skb)
519{
520 struct net *net = dev_net(skb->dev);
521 struct sock *sk;
522 struct inet6_dev *idev;
523 struct ipv6_pinfo *np;
524 const struct in6_addr *saddr = NULL;
525 struct icmp6hdr *icmph = icmp6_hdr(skb);
526 struct icmp6hdr tmp_hdr;
527 struct flowi6 fl6;
528 struct icmpv6_msg msg;
529 struct dst_entry *dst;
530 int err = 0;
531 int hlimit;
532
533 saddr = &ipv6_hdr(skb)->daddr;
534
535 if (!ipv6_unicast_destination(skb))
536 saddr = NULL;
537
538 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
539 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
540
541 memset(&fl6, 0, sizeof(fl6));
542 fl6.flowi6_proto = IPPROTO_ICMPV6;
543 ipv6_addr_copy(&fl6.daddr, &ipv6_hdr(skb)->saddr);
544 if (saddr)
545 ipv6_addr_copy(&fl6.saddr, saddr);
546 fl6.flowi6_oif = skb->dev->ifindex;
547 fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
548 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
549
550 sk = icmpv6_xmit_lock(net);
551 if (sk == NULL)
552 return;
553 np = inet6_sk(sk);
554
555 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
556 fl6.flowi6_oif = np->mcast_oif;
557
558 err = ip6_dst_lookup(sk, &dst, &fl6);
559 if (err)
560 goto out;
561 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
562 if (IS_ERR(dst))
563 goto out;
564
565 if (ipv6_addr_is_multicast(&fl6.daddr))
566 hlimit = np->mcast_hops;
567 else
568 hlimit = np->hop_limit;
569 if (hlimit < 0)
570 hlimit = ip6_dst_hoplimit(dst);
571
572 idev = in6_dev_get(skb->dev);
573
574 msg.skb = skb;
575 msg.offset = 0;
576 msg.type = ICMPV6_ECHO_REPLY;
577
578 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
579 sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6,
580 (struct rt6_info*)dst, MSG_DONTWAIT,
581 np->dontfrag);
582
583 if (err) {
584 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
585 ip6_flush_pending_frames(sk);
586 goto out_put;
587 }
588 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
589
590out_put:
591 if (likely(idev != NULL))
592 in6_dev_put(idev);
593 dst_release(dst);
594out:
595 icmpv6_xmit_unlock(sk);
596}
597
598static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
599{
600 const struct inet6_protocol *ipprot;
601 int inner_offset;
602 int hash;
603 u8 nexthdr;
604
605 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
606 return;
607
608 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
609 if (ipv6_ext_hdr(nexthdr)) {
610 /* now skip over extension headers */
611 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
612 if (inner_offset<0)
613 return;
614 } else {
615 inner_offset = sizeof(struct ipv6hdr);
616 }
617
618 /* Checkin header including 8 bytes of inner protocol header. */
619 if (!pskb_may_pull(skb, inner_offset+8))
620 return;
621
622 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
623 Without this we will not able f.e. to make source routed
624 pmtu discovery.
625 Corresponding argument (opt) to notifiers is already added.
626 --ANK (980726)
627 */
628
629 hash = nexthdr & (MAX_INET_PROTOS - 1);
630
631 rcu_read_lock();
632 ipprot = rcu_dereference(inet6_protos[hash]);
633 if (ipprot && ipprot->err_handler)
634 ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
635 rcu_read_unlock();
636
637 raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
638}
639
640/*
641 * Handle icmp messages
642 */
643
644static int icmpv6_rcv(struct sk_buff *skb)
645{
646 struct net_device *dev = skb->dev;
647 struct inet6_dev *idev = __in6_dev_get(dev);
648 const struct in6_addr *saddr, *daddr;
649 const struct ipv6hdr *orig_hdr;
650 struct icmp6hdr *hdr;
651 u8 type;
652
653 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
654 struct sec_path *sp = skb_sec_path(skb);
655 int nh;
656
657 if (!(sp && sp->xvec[sp->len - 1]->props.flags &
658 XFRM_STATE_ICMP))
659 goto drop_no_count;
660
661 if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr)))
662 goto drop_no_count;
663
664 nh = skb_network_offset(skb);
665 skb_set_network_header(skb, sizeof(*hdr));
666
667 if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
668 goto drop_no_count;
669
670 skb_set_network_header(skb, nh);
671 }
672
673 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS);
674
675 saddr = &ipv6_hdr(skb)->saddr;
676 daddr = &ipv6_hdr(skb)->daddr;
677
678 /* Perform checksum. */
679 switch (skb->ip_summed) {
680 case CHECKSUM_COMPLETE:
681 if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
682 skb->csum))
683 break;
684 /* fall through */
685 case CHECKSUM_NONE:
686 skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
687 IPPROTO_ICMPV6, 0));
688 if (__skb_checksum_complete(skb)) {
689 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n",
690 saddr, daddr);
691 goto discard_it;
692 }
693 }
694
695 if (!pskb_pull(skb, sizeof(*hdr)))
696 goto discard_it;
697
698 hdr = icmp6_hdr(skb);
699
700 type = hdr->icmp6_type;
701
702 ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type);
703
704 switch (type) {
705 case ICMPV6_ECHO_REQUEST:
706 icmpv6_echo_reply(skb);
707 break;
708
709 case ICMPV6_ECHO_REPLY:
710 /* we couldn't care less */
711 break;
712
713 case ICMPV6_PKT_TOOBIG:
714 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
715 standard destination cache. Seems, only "advanced"
716 destination cache will allow to solve this problem
717 --ANK (980726)
718 */
719 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
720 goto discard_it;
721 hdr = icmp6_hdr(skb);
722 orig_hdr = (struct ipv6hdr *) (hdr + 1);
723 rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
724 ntohl(hdr->icmp6_mtu));
725
726 /*
727 * Drop through to notify
728 */
729
730 case ICMPV6_DEST_UNREACH:
731 case ICMPV6_TIME_EXCEED:
732 case ICMPV6_PARAMPROB:
733 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
734 break;
735
736 case NDISC_ROUTER_SOLICITATION:
737 case NDISC_ROUTER_ADVERTISEMENT:
738 case NDISC_NEIGHBOUR_SOLICITATION:
739 case NDISC_NEIGHBOUR_ADVERTISEMENT:
740 case NDISC_REDIRECT:
741 ndisc_rcv(skb);
742 break;
743
744 case ICMPV6_MGM_QUERY:
745 igmp6_event_query(skb);
746 break;
747
748 case ICMPV6_MGM_REPORT:
749 igmp6_event_report(skb);
750 break;
751
752 case ICMPV6_MGM_REDUCTION:
753 case ICMPV6_NI_QUERY:
754 case ICMPV6_NI_REPLY:
755 case ICMPV6_MLD2_REPORT:
756 case ICMPV6_DHAAD_REQUEST:
757 case ICMPV6_DHAAD_REPLY:
758 case ICMPV6_MOBILE_PREFIX_SOL:
759 case ICMPV6_MOBILE_PREFIX_ADV:
760 break;
761
762 default:
763 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n");
764
765 /* informational */
766 if (type & ICMPV6_INFOMSG_MASK)
767 break;
768
769 /*
770 * error of unknown type.
771 * must pass to upper level
772 */
773
774 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
775 }
776
777 kfree_skb(skb);
778 return 0;
779
780discard_it:
781 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS);
782drop_no_count:
783 kfree_skb(skb);
784 return 0;
785}
786
787void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
788 u8 type,
789 const struct in6_addr *saddr,
790 const struct in6_addr *daddr,
791 int oif)
792{
793 memset(fl6, 0, sizeof(*fl6));
794 ipv6_addr_copy(&fl6->saddr, saddr);
795 ipv6_addr_copy(&fl6->daddr, daddr);
796 fl6->flowi6_proto = IPPROTO_ICMPV6;
797 fl6->fl6_icmp_type = type;
798 fl6->fl6_icmp_code = 0;
799 fl6->flowi6_oif = oif;
800 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
801}
802
803/*
804 * Special lock-class for __icmpv6_sk:
805 */
806static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
807
808static int __net_init icmpv6_sk_init(struct net *net)
809{
810 struct sock *sk;
811 int err, i, j;
812
813 net->ipv6.icmp_sk =
814 kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
815 if (net->ipv6.icmp_sk == NULL)
816 return -ENOMEM;
817
818 for_each_possible_cpu(i) {
819 err = inet_ctl_sock_create(&sk, PF_INET6,
820 SOCK_RAW, IPPROTO_ICMPV6, net);
821 if (err < 0) {
822 printk(KERN_ERR
823 "Failed to initialize the ICMP6 control socket "
824 "(err %d).\n",
825 err);
826 goto fail;
827 }
828
829 net->ipv6.icmp_sk[i] = sk;
830
831 /*
832 * Split off their lock-class, because sk->sk_dst_lock
833 * gets used from softirqs, which is safe for
834 * __icmpv6_sk (because those never get directly used
835 * via userspace syscalls), but unsafe for normal sockets.
836 */
837 lockdep_set_class(&sk->sk_dst_lock,
838 &icmpv6_socket_sk_dst_lock_key);
839
840 /* Enough space for 2 64K ICMP packets, including
841 * sk_buff struct overhead.
842 */
843 sk->sk_sndbuf =
844 (2 * ((64 * 1024) + sizeof(struct sk_buff)));
845 }
846 return 0;
847
848 fail:
849 for (j = 0; j < i; j++)
850 inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
851 kfree(net->ipv6.icmp_sk);
852 return err;
853}
854
855static void __net_exit icmpv6_sk_exit(struct net *net)
856{
857 int i;
858
859 for_each_possible_cpu(i) {
860 inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
861 }
862 kfree(net->ipv6.icmp_sk);
863}
864
865static struct pernet_operations icmpv6_sk_ops = {
866 .init = icmpv6_sk_init,
867 .exit = icmpv6_sk_exit,
868};
869
870int __init icmpv6_init(void)
871{
872 int err;
873
874 err = register_pernet_subsys(&icmpv6_sk_ops);
875 if (err < 0)
876 return err;
877
878 err = -EAGAIN;
879 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
880 goto fail;
881 return 0;
882
883fail:
884 printk(KERN_ERR "Failed to register ICMP6 protocol\n");
885 unregister_pernet_subsys(&icmpv6_sk_ops);
886 return err;
887}
888
889void icmpv6_cleanup(void)
890{
891 unregister_pernet_subsys(&icmpv6_sk_ops);
892 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
893}
894
895
896static const struct icmp6_err {
897 int err;
898 int fatal;
899} tab_unreach[] = {
900 { /* NOROUTE */
901 .err = ENETUNREACH,
902 .fatal = 0,
903 },
904 { /* ADM_PROHIBITED */
905 .err = EACCES,
906 .fatal = 1,
907 },
908 { /* Was NOT_NEIGHBOUR, now reserved */
909 .err = EHOSTUNREACH,
910 .fatal = 0,
911 },
912 { /* ADDR_UNREACH */
913 .err = EHOSTUNREACH,
914 .fatal = 0,
915 },
916 { /* PORT_UNREACH */
917 .err = ECONNREFUSED,
918 .fatal = 1,
919 },
920};
921
922int icmpv6_err_convert(u8 type, u8 code, int *err)
923{
924 int fatal = 0;
925
926 *err = EPROTO;
927
928 switch (type) {
929 case ICMPV6_DEST_UNREACH:
930 fatal = 1;
931 if (code <= ICMPV6_PORT_UNREACH) {
932 *err = tab_unreach[code].err;
933 fatal = tab_unreach[code].fatal;
934 }
935 break;
936
937 case ICMPV6_PKT_TOOBIG:
938 *err = EMSGSIZE;
939 break;
940
941 case ICMPV6_PARAMPROB:
942 *err = EPROTO;
943 fatal = 1;
944 break;
945
946 case ICMPV6_TIME_EXCEED:
947 *err = EHOSTUNREACH;
948 break;
949 }
950
951 return fatal;
952}
953
954EXPORT_SYMBOL(icmpv6_err_convert);
955
956#ifdef CONFIG_SYSCTL
957ctl_table ipv6_icmp_table_template[] = {
958 {
959 .procname = "ratelimit",
960 .data = &init_net.ipv6.sysctl.icmpv6_time,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec_ms_jiffies,
964 },
965 { },
966};
967
968struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
969{
970 struct ctl_table *table;
971
972 table = kmemdup(ipv6_icmp_table_template,
973 sizeof(ipv6_icmp_table_template),
974 GFP_KERNEL);
975
976 if (table)
977 table[0].data = &net->ipv6.sysctl.icmpv6_time;
978
979 return table;
980}
981#endif
982
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Internet Control Message Protocol (ICMPv6)
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on net/ipv4/icmp.c
10 *
11 * RFC 1885
12 */
13
14/*
15 * Changes:
16 *
17 * Andi Kleen : exception handling
18 * Andi Kleen add rate limits. never reply to a icmp.
19 * add more length checks and other fixes.
20 * yoshfuji : ensure to sent parameter problem for
21 * fragments.
22 * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
23 * Randy Dunlap and
24 * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support
25 * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
26 */
27
28#define pr_fmt(fmt) "IPv6: " fmt
29
30#include <linux/module.h>
31#include <linux/errno.h>
32#include <linux/types.h>
33#include <linux/socket.h>
34#include <linux/in.h>
35#include <linux/kernel.h>
36#include <linux/sockios.h>
37#include <linux/net.h>
38#include <linux/skbuff.h>
39#include <linux/init.h>
40#include <linux/netfilter.h>
41#include <linux/slab.h>
42
43#ifdef CONFIG_SYSCTL
44#include <linux/sysctl.h>
45#endif
46
47#include <linux/inet.h>
48#include <linux/netdevice.h>
49#include <linux/icmpv6.h>
50
51#include <net/ip.h>
52#include <net/sock.h>
53
54#include <net/ipv6.h>
55#include <net/ip6_checksum.h>
56#include <net/ping.h>
57#include <net/protocol.h>
58#include <net/raw.h>
59#include <net/rawv6.h>
60#include <net/transp_v6.h>
61#include <net/ip6_route.h>
62#include <net/addrconf.h>
63#include <net/icmp.h>
64#include <net/xfrm.h>
65#include <net/inet_common.h>
66#include <net/dsfield.h>
67#include <net/l3mdev.h>
68
69#include <linux/uaccess.h>
70
71/*
72 * The ICMP socket(s). This is the most convenient way to flow control
73 * our ICMP output as well as maintain a clean interface throughout
74 * all layers. All Socketless IP sends will soon be gone.
75 *
76 * On SMP we have one ICMP socket per-cpu.
77 */
78static struct sock *icmpv6_sk(struct net *net)
79{
80 return this_cpu_read(*net->ipv6.icmp_sk);
81}
82
83static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
84 u8 type, u8 code, int offset, __be32 info)
85{
86 /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
87 struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
88 struct net *net = dev_net(skb->dev);
89
90 if (type == ICMPV6_PKT_TOOBIG)
91 ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL));
92 else if (type == NDISC_REDIRECT)
93 ip6_redirect(skb, net, skb->dev->ifindex, 0,
94 sock_net_uid(net, NULL));
95
96 if (!(type & ICMPV6_INFOMSG_MASK))
97 if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
98 ping_err(skb, offset, ntohl(info));
99
100 return 0;
101}
102
103static int icmpv6_rcv(struct sk_buff *skb);
104
105static const struct inet6_protocol icmpv6_protocol = {
106 .handler = icmpv6_rcv,
107 .err_handler = icmpv6_err,
108 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
109};
110
111/* Called with BH disabled */
112static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
113{
114 struct sock *sk;
115
116 sk = icmpv6_sk(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.
121 */
122 return NULL;
123 }
124 return sk;
125}
126
127static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
128{
129 spin_unlock(&sk->sk_lock.slock);
130}
131
132/*
133 * Figure out, may we reply to this packet with icmp error.
134 *
135 * We do not reply, if:
136 * - it was icmp error message.
137 * - it is truncated, so that it is known, that protocol is ICMPV6
138 * (i.e. in the middle of some exthdr)
139 *
140 * --ANK (980726)
141 */
142
143static bool is_ineligible(const struct sk_buff *skb)
144{
145 int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
146 int len = skb->len - ptr;
147 __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
148 __be16 frag_off;
149
150 if (len < 0)
151 return true;
152
153 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
154 if (ptr < 0)
155 return false;
156 if (nexthdr == IPPROTO_ICMPV6) {
157 u8 _type, *tp;
158 tp = skb_header_pointer(skb,
159 ptr+offsetof(struct icmp6hdr, icmp6_type),
160 sizeof(_type), &_type);
161 if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
162 return true;
163 }
164 return false;
165}
166
167static bool icmpv6_mask_allow(struct net *net, int type)
168{
169 if (type > ICMPV6_MSG_MAX)
170 return true;
171
172 /* Limit if icmp type is set in ratemask. */
173 if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask))
174 return true;
175
176 return false;
177}
178
179static bool icmpv6_global_allow(struct net *net, int type)
180{
181 if (icmpv6_mask_allow(net, type))
182 return true;
183
184 if (icmp_global_allow())
185 return true;
186
187 return false;
188}
189
190/*
191 * Check the ICMP output rate limit
192 */
193static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
194 struct flowi6 *fl6)
195{
196 struct net *net = sock_net(sk);
197 struct dst_entry *dst;
198 bool res = false;
199
200 if (icmpv6_mask_allow(net, type))
201 return true;
202
203 /*
204 * Look up the output route.
205 * XXX: perhaps the expire for routing entries cloned by
206 * this lookup should be more aggressive (not longer than timeout).
207 */
208 dst = ip6_route_output(net, sk, fl6);
209 if (dst->error) {
210 IP6_INC_STATS(net, ip6_dst_idev(dst),
211 IPSTATS_MIB_OUTNOROUTES);
212 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
213 res = true;
214 } else {
215 struct rt6_info *rt = (struct rt6_info *)dst;
216 int tmo = net->ipv6.sysctl.icmpv6_time;
217 struct inet_peer *peer;
218
219 /* Give more bandwidth to wider prefixes. */
220 if (rt->rt6i_dst.plen < 128)
221 tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
222
223 peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1);
224 res = inet_peer_xrlim_allow(peer, tmo);
225 if (peer)
226 inet_putpeer(peer);
227 }
228 dst_release(dst);
229 return res;
230}
231
232/*
233 * an inline helper for the "simple" if statement below
234 * checks if parameter problem report is caused by an
235 * unrecognized IPv6 option that has the Option Type
236 * highest-order two bits set to 10
237 */
238
239static bool opt_unrec(struct sk_buff *skb, __u32 offset)
240{
241 u8 _optval, *op;
242
243 offset += skb_network_offset(skb);
244 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
245 if (!op)
246 return true;
247 return (*op & 0xC0) == 0x80;
248}
249
250void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
251 struct icmp6hdr *thdr, int len)
252{
253 struct sk_buff *skb;
254 struct icmp6hdr *icmp6h;
255
256 skb = skb_peek(&sk->sk_write_queue);
257 if (!skb)
258 return;
259
260 icmp6h = icmp6_hdr(skb);
261 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
262 icmp6h->icmp6_cksum = 0;
263
264 if (skb_queue_len(&sk->sk_write_queue) == 1) {
265 skb->csum = csum_partial(icmp6h,
266 sizeof(struct icmp6hdr), skb->csum);
267 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
268 &fl6->daddr,
269 len, fl6->flowi6_proto,
270 skb->csum);
271 } else {
272 __wsum tmp_csum = 0;
273
274 skb_queue_walk(&sk->sk_write_queue, skb) {
275 tmp_csum = csum_add(tmp_csum, skb->csum);
276 }
277
278 tmp_csum = csum_partial(icmp6h,
279 sizeof(struct icmp6hdr), tmp_csum);
280 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
281 &fl6->daddr,
282 len, fl6->flowi6_proto,
283 tmp_csum);
284 }
285 ip6_push_pending_frames(sk);
286}
287
288struct icmpv6_msg {
289 struct sk_buff *skb;
290 int offset;
291 uint8_t type;
292};
293
294static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
295{
296 struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
297 struct sk_buff *org_skb = msg->skb;
298 __wsum csum = 0;
299
300 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
301 to, len, csum);
302 skb->csum = csum_block_add(skb->csum, csum, odd);
303 if (!(msg->type & ICMPV6_INFOMSG_MASK))
304 nf_ct_attach(skb, org_skb);
305 return 0;
306}
307
308#if IS_ENABLED(CONFIG_IPV6_MIP6)
309static void mip6_addr_swap(struct sk_buff *skb)
310{
311 struct ipv6hdr *iph = ipv6_hdr(skb);
312 struct inet6_skb_parm *opt = IP6CB(skb);
313 struct ipv6_destopt_hao *hao;
314 struct in6_addr tmp;
315 int off;
316
317 if (opt->dsthao) {
318 off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
319 if (likely(off >= 0)) {
320 hao = (struct ipv6_destopt_hao *)
321 (skb_network_header(skb) + off);
322 tmp = iph->saddr;
323 iph->saddr = hao->addr;
324 hao->addr = tmp;
325 }
326 }
327}
328#else
329static inline void mip6_addr_swap(struct sk_buff *skb) {}
330#endif
331
332static struct dst_entry *icmpv6_route_lookup(struct net *net,
333 struct sk_buff *skb,
334 struct sock *sk,
335 struct flowi6 *fl6)
336{
337 struct dst_entry *dst, *dst2;
338 struct flowi6 fl2;
339 int err;
340
341 err = ip6_dst_lookup(net, sk, &dst, fl6);
342 if (err)
343 return ERR_PTR(err);
344
345 /*
346 * We won't send icmp if the destination is known
347 * anycast.
348 */
349 if (ipv6_anycast_destination(dst, &fl6->daddr)) {
350 net_dbg_ratelimited("icmp6_send: acast source\n");
351 dst_release(dst);
352 return ERR_PTR(-EINVAL);
353 }
354
355 /* No need to clone since we're just using its address. */
356 dst2 = dst;
357
358 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
359 if (!IS_ERR(dst)) {
360 if (dst != dst2)
361 return dst;
362 } else {
363 if (PTR_ERR(dst) == -EPERM)
364 dst = NULL;
365 else
366 return dst;
367 }
368
369 err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
370 if (err)
371 goto relookup_failed;
372
373 err = ip6_dst_lookup(net, sk, &dst2, &fl2);
374 if (err)
375 goto relookup_failed;
376
377 dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
378 if (!IS_ERR(dst2)) {
379 dst_release(dst);
380 dst = dst2;
381 } else {
382 err = PTR_ERR(dst2);
383 if (err == -EPERM) {
384 dst_release(dst);
385 return dst2;
386 } else
387 goto relookup_failed;
388 }
389
390relookup_failed:
391 if (dst)
392 return dst;
393 return ERR_PTR(err);
394}
395
396static struct net_device *icmp6_dev(const struct sk_buff *skb)
397{
398 struct net_device *dev = skb->dev;
399
400 /* for local traffic to local address, skb dev is the loopback
401 * device. Check if there is a dst attached to the skb and if so
402 * get the real device index. Same is needed for replies to a link
403 * local address on a device enslaved to an L3 master device
404 */
405 if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) {
406 const struct rt6_info *rt6 = skb_rt6_info(skb);
407
408 if (rt6)
409 dev = rt6->rt6i_idev->dev;
410 }
411
412 return dev;
413}
414
415static int icmp6_iif(const struct sk_buff *skb)
416{
417 return icmp6_dev(skb)->ifindex;
418}
419
420/*
421 * Send an ICMP message in response to a packet in error
422 */
423static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
424 const struct in6_addr *force_saddr)
425{
426 struct inet6_dev *idev = NULL;
427 struct ipv6hdr *hdr = ipv6_hdr(skb);
428 struct sock *sk;
429 struct net *net;
430 struct ipv6_pinfo *np;
431 const struct in6_addr *saddr = NULL;
432 struct dst_entry *dst;
433 struct icmp6hdr tmp_hdr;
434 struct flowi6 fl6;
435 struct icmpv6_msg msg;
436 struct ipcm6_cookie ipc6;
437 int iif = 0;
438 int addr_type = 0;
439 int len;
440 u32 mark;
441
442 if ((u8 *)hdr < skb->head ||
443 (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
444 return;
445
446 if (!skb->dev)
447 return;
448 net = dev_net(skb->dev);
449 mark = IP6_REPLY_MARK(net, skb->mark);
450 /*
451 * Make sure we respect the rules
452 * i.e. RFC 1885 2.4(e)
453 * Rule (e.1) is enforced by not using icmp6_send
454 * in any code that processes icmp errors.
455 */
456 addr_type = ipv6_addr_type(&hdr->daddr);
457
458 if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) ||
459 ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr))
460 saddr = &hdr->daddr;
461
462 /*
463 * Dest addr check
464 */
465
466 if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) {
467 if (type != ICMPV6_PKT_TOOBIG &&
468 !(type == ICMPV6_PARAMPROB &&
469 code == ICMPV6_UNK_OPTION &&
470 (opt_unrec(skb, info))))
471 return;
472
473 saddr = NULL;
474 }
475
476 addr_type = ipv6_addr_type(&hdr->saddr);
477
478 /*
479 * Source addr check
480 */
481
482 if (__ipv6_addr_needs_scope_id(addr_type)) {
483 iif = icmp6_iif(skb);
484 } else {
485 dst = skb_dst(skb);
486 iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
487 }
488
489 /*
490 * Must not send error if the source does not uniquely
491 * identify a single node (RFC2463 Section 2.4).
492 * We check unspecified / multicast addresses here,
493 * and anycast addresses will be checked later.
494 */
495 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
496 net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
497 &hdr->saddr, &hdr->daddr);
498 return;
499 }
500
501 /*
502 * Never answer to a ICMP packet.
503 */
504 if (is_ineligible(skb)) {
505 net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
506 &hdr->saddr, &hdr->daddr);
507 return;
508 }
509
510 /* Needed by both icmp_global_allow and icmpv6_xmit_lock */
511 local_bh_disable();
512
513 /* Check global sysctl_icmp_msgs_per_sec ratelimit */
514 if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type))
515 goto out_bh_enable;
516
517 mip6_addr_swap(skb);
518
519 memset(&fl6, 0, sizeof(fl6));
520 fl6.flowi6_proto = IPPROTO_ICMPV6;
521 fl6.daddr = hdr->saddr;
522 if (force_saddr)
523 saddr = force_saddr;
524 if (saddr)
525 fl6.saddr = *saddr;
526 fl6.flowi6_mark = mark;
527 fl6.flowi6_oif = iif;
528 fl6.fl6_icmp_type = type;
529 fl6.fl6_icmp_code = code;
530 fl6.flowi6_uid = sock_net_uid(net, NULL);
531 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL);
532 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
533
534 sk = icmpv6_xmit_lock(net);
535 if (!sk)
536 goto out_bh_enable;
537
538 sk->sk_mark = mark;
539 np = inet6_sk(sk);
540
541 if (!icmpv6_xrlim_allow(sk, type, &fl6))
542 goto out;
543
544 tmp_hdr.icmp6_type = type;
545 tmp_hdr.icmp6_code = code;
546 tmp_hdr.icmp6_cksum = 0;
547 tmp_hdr.icmp6_pointer = htonl(info);
548
549 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
550 fl6.flowi6_oif = np->mcast_oif;
551 else if (!fl6.flowi6_oif)
552 fl6.flowi6_oif = np->ucast_oif;
553
554 ipcm6_init_sk(&ipc6, np);
555 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
556
557 dst = icmpv6_route_lookup(net, skb, sk, &fl6);
558 if (IS_ERR(dst))
559 goto out;
560
561 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
562
563 msg.skb = skb;
564 msg.offset = skb_network_offset(skb);
565 msg.type = type;
566
567 len = skb->len - msg.offset;
568 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr));
569 if (len < 0) {
570 net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
571 &hdr->saddr, &hdr->daddr);
572 goto out_dst_release;
573 }
574
575 rcu_read_lock();
576 idev = __in6_dev_get(skb->dev);
577
578 if (ip6_append_data(sk, icmpv6_getfrag, &msg,
579 len + sizeof(struct icmp6hdr),
580 sizeof(struct icmp6hdr),
581 &ipc6, &fl6, (struct rt6_info *)dst,
582 MSG_DONTWAIT)) {
583 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
584 ip6_flush_pending_frames(sk);
585 } else {
586 icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
587 len + sizeof(struct icmp6hdr));
588 }
589 rcu_read_unlock();
590out_dst_release:
591 dst_release(dst);
592out:
593 icmpv6_xmit_unlock(sk);
594out_bh_enable:
595 local_bh_enable();
596}
597
598/* Slightly more convenient version of icmp6_send.
599 */
600void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
601{
602 icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL);
603 kfree_skb(skb);
604}
605
606/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
607 * if sufficient data bytes are available
608 * @nhs is the size of the tunnel header(s) :
609 * Either an IPv4 header for SIT encap
610 * an IPv4 header + GRE header for GRE encap
611 */
612int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
613 unsigned int data_len)
614{
615 struct in6_addr temp_saddr;
616 struct rt6_info *rt;
617 struct sk_buff *skb2;
618 u32 info = 0;
619
620 if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8))
621 return 1;
622
623 /* RFC 4884 (partial) support for ICMP extensions */
624 if (data_len < 128 || (data_len & 7) || skb->len < data_len)
625 data_len = 0;
626
627 skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC);
628
629 if (!skb2)
630 return 1;
631
632 skb_dst_drop(skb2);
633 skb_pull(skb2, nhs);
634 skb_reset_network_header(skb2);
635
636 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0,
637 skb, 0);
638
639 if (rt && rt->dst.dev)
640 skb2->dev = rt->dst.dev;
641
642 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr);
643
644 if (data_len) {
645 /* RFC 4884 (partial) support :
646 * insert 0 padding at the end, before the extensions
647 */
648 __skb_push(skb2, nhs);
649 skb_reset_network_header(skb2);
650 memmove(skb2->data, skb2->data + nhs, data_len - nhs);
651 memset(skb2->data + data_len - nhs, 0, nhs);
652 /* RFC 4884 4.5 : Length is measured in 64-bit words,
653 * and stored in reserved[0]
654 */
655 info = (data_len/8) << 24;
656 }
657 if (type == ICMP_TIME_EXCEEDED)
658 icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
659 info, &temp_saddr);
660 else
661 icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH,
662 info, &temp_saddr);
663 if (rt)
664 ip6_rt_put(rt);
665
666 kfree_skb(skb2);
667
668 return 0;
669}
670EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
671
672static void icmpv6_echo_reply(struct sk_buff *skb)
673{
674 struct net *net = dev_net(skb->dev);
675 struct sock *sk;
676 struct inet6_dev *idev;
677 struct ipv6_pinfo *np;
678 const struct in6_addr *saddr = NULL;
679 struct icmp6hdr *icmph = icmp6_hdr(skb);
680 struct icmp6hdr tmp_hdr;
681 struct flowi6 fl6;
682 struct icmpv6_msg msg;
683 struct dst_entry *dst;
684 struct ipcm6_cookie ipc6;
685 u32 mark = IP6_REPLY_MARK(net, skb->mark);
686 bool acast;
687
688 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
689 net->ipv6.sysctl.icmpv6_echo_ignore_multicast)
690 return;
691
692 saddr = &ipv6_hdr(skb)->daddr;
693
694 acast = ipv6_anycast_destination(skb_dst(skb), saddr);
695 if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast)
696 return;
697
698 if (!ipv6_unicast_destination(skb) &&
699 !(net->ipv6.sysctl.anycast_src_echo_reply && acast))
700 saddr = NULL;
701
702 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
703 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
704
705 memset(&fl6, 0, sizeof(fl6));
706 if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES)
707 fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb));
708
709 fl6.flowi6_proto = IPPROTO_ICMPV6;
710 fl6.daddr = ipv6_hdr(skb)->saddr;
711 if (saddr)
712 fl6.saddr = *saddr;
713 fl6.flowi6_oif = icmp6_iif(skb);
714 fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
715 fl6.flowi6_mark = mark;
716 fl6.flowi6_uid = sock_net_uid(net, NULL);
717 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
718
719 local_bh_disable();
720 sk = icmpv6_xmit_lock(net);
721 if (!sk)
722 goto out_bh_enable;
723 sk->sk_mark = mark;
724 np = inet6_sk(sk);
725
726 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
727 fl6.flowi6_oif = np->mcast_oif;
728 else if (!fl6.flowi6_oif)
729 fl6.flowi6_oif = np->ucast_oif;
730
731 if (ip6_dst_lookup(net, sk, &dst, &fl6))
732 goto out;
733 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
734 if (IS_ERR(dst))
735 goto out;
736
737 /* Check the ratelimit */
738 if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) ||
739 !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6))
740 goto out_dst_release;
741
742 idev = __in6_dev_get(skb->dev);
743
744 msg.skb = skb;
745 msg.offset = 0;
746 msg.type = ICMPV6_ECHO_REPLY;
747
748 ipcm6_init_sk(&ipc6, np);
749 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
750 ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb));
751
752 if (ip6_append_data(sk, icmpv6_getfrag, &msg,
753 skb->len + sizeof(struct icmp6hdr),
754 sizeof(struct icmp6hdr), &ipc6, &fl6,
755 (struct rt6_info *)dst, MSG_DONTWAIT)) {
756 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
757 ip6_flush_pending_frames(sk);
758 } else {
759 icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
760 skb->len + sizeof(struct icmp6hdr));
761 }
762out_dst_release:
763 dst_release(dst);
764out:
765 icmpv6_xmit_unlock(sk);
766out_bh_enable:
767 local_bh_enable();
768}
769
770void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
771{
772 const struct inet6_protocol *ipprot;
773 int inner_offset;
774 __be16 frag_off;
775 u8 nexthdr;
776 struct net *net = dev_net(skb->dev);
777
778 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
779 goto out;
780
781 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
782 if (ipv6_ext_hdr(nexthdr)) {
783 /* now skip over extension headers */
784 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
785 &nexthdr, &frag_off);
786 if (inner_offset < 0)
787 goto out;
788 } else {
789 inner_offset = sizeof(struct ipv6hdr);
790 }
791
792 /* Checkin header including 8 bytes of inner protocol header. */
793 if (!pskb_may_pull(skb, inner_offset+8))
794 goto out;
795
796 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
797 Without this we will not able f.e. to make source routed
798 pmtu discovery.
799 Corresponding argument (opt) to notifiers is already added.
800 --ANK (980726)
801 */
802
803 ipprot = rcu_dereference(inet6_protos[nexthdr]);
804 if (ipprot && ipprot->err_handler)
805 ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
806
807 raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
808 return;
809
810out:
811 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
812}
813
814/*
815 * Handle icmp messages
816 */
817
818static int icmpv6_rcv(struct sk_buff *skb)
819{
820 struct net *net = dev_net(skb->dev);
821 struct net_device *dev = icmp6_dev(skb);
822 struct inet6_dev *idev = __in6_dev_get(dev);
823 const struct in6_addr *saddr, *daddr;
824 struct icmp6hdr *hdr;
825 u8 type;
826 bool success = false;
827
828 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
829 struct sec_path *sp = skb_sec_path(skb);
830 int nh;
831
832 if (!(sp && sp->xvec[sp->len - 1]->props.flags &
833 XFRM_STATE_ICMP))
834 goto drop_no_count;
835
836 if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
837 goto drop_no_count;
838
839 nh = skb_network_offset(skb);
840 skb_set_network_header(skb, sizeof(*hdr));
841
842 if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
843 goto drop_no_count;
844
845 skb_set_network_header(skb, nh);
846 }
847
848 __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS);
849
850 saddr = &ipv6_hdr(skb)->saddr;
851 daddr = &ipv6_hdr(skb)->daddr;
852
853 if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
854 net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
855 saddr, daddr);
856 goto csum_error;
857 }
858
859 if (!pskb_pull(skb, sizeof(*hdr)))
860 goto discard_it;
861
862 hdr = icmp6_hdr(skb);
863
864 type = hdr->icmp6_type;
865
866 ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type);
867
868 switch (type) {
869 case ICMPV6_ECHO_REQUEST:
870 if (!net->ipv6.sysctl.icmpv6_echo_ignore_all)
871 icmpv6_echo_reply(skb);
872 break;
873
874 case ICMPV6_ECHO_REPLY:
875 success = ping_rcv(skb);
876 break;
877
878 case ICMPV6_PKT_TOOBIG:
879 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
880 standard destination cache. Seems, only "advanced"
881 destination cache will allow to solve this problem
882 --ANK (980726)
883 */
884 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
885 goto discard_it;
886 hdr = icmp6_hdr(skb);
887
888 /* to notify */
889 /* fall through */
890 case ICMPV6_DEST_UNREACH:
891 case ICMPV6_TIME_EXCEED:
892 case ICMPV6_PARAMPROB:
893 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
894 break;
895
896 case NDISC_ROUTER_SOLICITATION:
897 case NDISC_ROUTER_ADVERTISEMENT:
898 case NDISC_NEIGHBOUR_SOLICITATION:
899 case NDISC_NEIGHBOUR_ADVERTISEMENT:
900 case NDISC_REDIRECT:
901 ndisc_rcv(skb);
902 break;
903
904 case ICMPV6_MGM_QUERY:
905 igmp6_event_query(skb);
906 break;
907
908 case ICMPV6_MGM_REPORT:
909 igmp6_event_report(skb);
910 break;
911
912 case ICMPV6_MGM_REDUCTION:
913 case ICMPV6_NI_QUERY:
914 case ICMPV6_NI_REPLY:
915 case ICMPV6_MLD2_REPORT:
916 case ICMPV6_DHAAD_REQUEST:
917 case ICMPV6_DHAAD_REPLY:
918 case ICMPV6_MOBILE_PREFIX_SOL:
919 case ICMPV6_MOBILE_PREFIX_ADV:
920 break;
921
922 default:
923 /* informational */
924 if (type & ICMPV6_INFOMSG_MASK)
925 break;
926
927 net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
928 saddr, daddr);
929
930 /*
931 * error of unknown type.
932 * must pass to upper level
933 */
934
935 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
936 }
937
938 /* until the v6 path can be better sorted assume failure and
939 * preserve the status quo behaviour for the rest of the paths to here
940 */
941 if (success)
942 consume_skb(skb);
943 else
944 kfree_skb(skb);
945
946 return 0;
947
948csum_error:
949 __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
950discard_it:
951 __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS);
952drop_no_count:
953 kfree_skb(skb);
954 return 0;
955}
956
957void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
958 u8 type,
959 const struct in6_addr *saddr,
960 const struct in6_addr *daddr,
961 int oif)
962{
963 memset(fl6, 0, sizeof(*fl6));
964 fl6->saddr = *saddr;
965 fl6->daddr = *daddr;
966 fl6->flowi6_proto = IPPROTO_ICMPV6;
967 fl6->fl6_icmp_type = type;
968 fl6->fl6_icmp_code = 0;
969 fl6->flowi6_oif = oif;
970 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
971}
972
973static void __net_exit icmpv6_sk_exit(struct net *net)
974{
975 int i;
976
977 for_each_possible_cpu(i)
978 inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i));
979 free_percpu(net->ipv6.icmp_sk);
980}
981
982static int __net_init icmpv6_sk_init(struct net *net)
983{
984 struct sock *sk;
985 int err, i;
986
987 net->ipv6.icmp_sk = alloc_percpu(struct sock *);
988 if (!net->ipv6.icmp_sk)
989 return -ENOMEM;
990
991 for_each_possible_cpu(i) {
992 err = inet_ctl_sock_create(&sk, PF_INET6,
993 SOCK_RAW, IPPROTO_ICMPV6, net);
994 if (err < 0) {
995 pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
996 err);
997 goto fail;
998 }
999
1000 *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk;
1001
1002 /* Enough space for 2 64K ICMP packets, including
1003 * sk_buff struct overhead.
1004 */
1005 sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
1006 }
1007 return 0;
1008
1009 fail:
1010 icmpv6_sk_exit(net);
1011 return err;
1012}
1013
1014static struct pernet_operations icmpv6_sk_ops = {
1015 .init = icmpv6_sk_init,
1016 .exit = icmpv6_sk_exit,
1017};
1018
1019int __init icmpv6_init(void)
1020{
1021 int err;
1022
1023 err = register_pernet_subsys(&icmpv6_sk_ops);
1024 if (err < 0)
1025 return err;
1026
1027 err = -EAGAIN;
1028 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
1029 goto fail;
1030
1031 err = inet6_register_icmp_sender(icmp6_send);
1032 if (err)
1033 goto sender_reg_err;
1034 return 0;
1035
1036sender_reg_err:
1037 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
1038fail:
1039 pr_err("Failed to register ICMP6 protocol\n");
1040 unregister_pernet_subsys(&icmpv6_sk_ops);
1041 return err;
1042}
1043
1044void icmpv6_cleanup(void)
1045{
1046 inet6_unregister_icmp_sender(icmp6_send);
1047 unregister_pernet_subsys(&icmpv6_sk_ops);
1048 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
1049}
1050
1051
1052static const struct icmp6_err {
1053 int err;
1054 int fatal;
1055} tab_unreach[] = {
1056 { /* NOROUTE */
1057 .err = ENETUNREACH,
1058 .fatal = 0,
1059 },
1060 { /* ADM_PROHIBITED */
1061 .err = EACCES,
1062 .fatal = 1,
1063 },
1064 { /* Was NOT_NEIGHBOUR, now reserved */
1065 .err = EHOSTUNREACH,
1066 .fatal = 0,
1067 },
1068 { /* ADDR_UNREACH */
1069 .err = EHOSTUNREACH,
1070 .fatal = 0,
1071 },
1072 { /* PORT_UNREACH */
1073 .err = ECONNREFUSED,
1074 .fatal = 1,
1075 },
1076 { /* POLICY_FAIL */
1077 .err = EACCES,
1078 .fatal = 1,
1079 },
1080 { /* REJECT_ROUTE */
1081 .err = EACCES,
1082 .fatal = 1,
1083 },
1084};
1085
1086int icmpv6_err_convert(u8 type, u8 code, int *err)
1087{
1088 int fatal = 0;
1089
1090 *err = EPROTO;
1091
1092 switch (type) {
1093 case ICMPV6_DEST_UNREACH:
1094 fatal = 1;
1095 if (code < ARRAY_SIZE(tab_unreach)) {
1096 *err = tab_unreach[code].err;
1097 fatal = tab_unreach[code].fatal;
1098 }
1099 break;
1100
1101 case ICMPV6_PKT_TOOBIG:
1102 *err = EMSGSIZE;
1103 break;
1104
1105 case ICMPV6_PARAMPROB:
1106 *err = EPROTO;
1107 fatal = 1;
1108 break;
1109
1110 case ICMPV6_TIME_EXCEED:
1111 *err = EHOSTUNREACH;
1112 break;
1113 }
1114
1115 return fatal;
1116}
1117EXPORT_SYMBOL(icmpv6_err_convert);
1118
1119#ifdef CONFIG_SYSCTL
1120static struct ctl_table ipv6_icmp_table_template[] = {
1121 {
1122 .procname = "ratelimit",
1123 .data = &init_net.ipv6.sysctl.icmpv6_time,
1124 .maxlen = sizeof(int),
1125 .mode = 0644,
1126 .proc_handler = proc_dointvec_ms_jiffies,
1127 },
1128 {
1129 .procname = "echo_ignore_all",
1130 .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all,
1131 .maxlen = sizeof(int),
1132 .mode = 0644,
1133 .proc_handler = proc_dointvec,
1134 },
1135 {
1136 .procname = "echo_ignore_multicast",
1137 .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast,
1138 .maxlen = sizeof(int),
1139 .mode = 0644,
1140 .proc_handler = proc_dointvec,
1141 },
1142 {
1143 .procname = "echo_ignore_anycast",
1144 .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast,
1145 .maxlen = sizeof(int),
1146 .mode = 0644,
1147 .proc_handler = proc_dointvec,
1148 },
1149 {
1150 .procname = "ratemask",
1151 .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr,
1152 .maxlen = ICMPV6_MSG_MAX + 1,
1153 .mode = 0644,
1154 .proc_handler = proc_do_large_bitmap,
1155 },
1156 { },
1157};
1158
1159struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
1160{
1161 struct ctl_table *table;
1162
1163 table = kmemdup(ipv6_icmp_table_template,
1164 sizeof(ipv6_icmp_table_template),
1165 GFP_KERNEL);
1166
1167 if (table) {
1168 table[0].data = &net->ipv6.sysctl.icmpv6_time;
1169 table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all;
1170 table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast;
1171 table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast;
1172 table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr;
1173 }
1174 return table;
1175}
1176#endif