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64
65#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
66
67#include <linux/module.h>
68#include <linux/types.h>
69#include <linux/jiffies.h>
70#include <linux/kernel.h>
71#include <linux/fcntl.h>
72#include <linux/socket.h>
73#include <linux/in.h>
74#include <linux/inet.h>
75#include <linux/inetdevice.h>
76#include <linux/netdevice.h>
77#include <linux/string.h>
78#include <linux/netfilter_ipv4.h>
79#include <linux/slab.h>
80#include <net/snmp.h>
81#include <net/ip.h>
82#include <net/route.h>
83#include <net/protocol.h>
84#include <net/icmp.h>
85#include <net/tcp.h>
86#include <net/udp.h>
87#include <net/raw.h>
88#include <net/ping.h>
89#include <linux/skbuff.h>
90#include <net/sock.h>
91#include <linux/errno.h>
92#include <linux/timer.h>
93#include <linux/init.h>
94#include <asm/uaccess.h>
95#include <net/checksum.h>
96#include <net/xfrm.h>
97#include <net/inet_common.h>
98#include <net/ip_fib.h>
99
100
101
102
103
104struct icmp_bxm {
105 struct sk_buff *skb;
106 int offset;
107 int data_len;
108
109 struct {
110 struct icmphdr icmph;
111 __be32 times[3];
112 } data;
113 int head_len;
114 struct ip_options_data replyopts;
115};
116
117
118
119
120const struct icmp_err icmp_err_convert[] = {
121 {
122 .errno = ENETUNREACH,
123 .fatal = 0,
124 },
125 {
126 .errno = EHOSTUNREACH,
127 .fatal = 0,
128 },
129 {
130 .errno = ENOPROTOOPT ,
131 .fatal = 1,
132 },
133 {
134 .errno = ECONNREFUSED,
135 .fatal = 1,
136 },
137 {
138 .errno = EMSGSIZE,
139 .fatal = 0,
140 },
141 {
142 .errno = EOPNOTSUPP,
143 .fatal = 0,
144 },
145 {
146 .errno = ENETUNREACH,
147 .fatal = 1,
148 },
149 {
150 .errno = EHOSTDOWN,
151 .fatal = 1,
152 },
153 {
154 .errno = ENONET,
155 .fatal = 1,
156 },
157 {
158 .errno = ENETUNREACH,
159 .fatal = 1,
160 },
161 {
162 .errno = EHOSTUNREACH,
163 .fatal = 1,
164 },
165 {
166 .errno = ENETUNREACH,
167 .fatal = 0,
168 },
169 {
170 .errno = EHOSTUNREACH,
171 .fatal = 0,
172 },
173 {
174 .errno = EHOSTUNREACH,
175 .fatal = 1,
176 },
177 {
178 .errno = EHOSTUNREACH,
179 .fatal = 1,
180 },
181 {
182 .errno = EHOSTUNREACH,
183 .fatal = 1,
184 },
185};
186EXPORT_SYMBOL(icmp_err_convert);
187
188
189
190
191
192struct icmp_control {
193 void (*handler)(struct sk_buff *skb);
194 short error;
195};
196
197static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1];
198
199
200
201
202
203
204
205
206static struct sock *icmp_sk(struct net *net)
207{
208 return net->ipv4.icmp_sk[smp_processor_id()];
209}
210
211static inline struct sock *icmp_xmit_lock(struct net *net)
212{
213 struct sock *sk;
214
215 local_bh_disable();
216
217 sk = icmp_sk(net);
218
219 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
220
221
222
223 local_bh_enable();
224 return NULL;
225 }
226 return sk;
227}
228
229static inline void icmp_xmit_unlock(struct sock *sk)
230{
231 spin_unlock_bh(&sk->sk_lock.slock);
232}
233
234
235
236
237
238static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
239 struct flowi4 *fl4, int type, int code)
240{
241 struct dst_entry *dst = &rt->dst;
242 bool rc = true;
243
244 if (type > NR_ICMP_TYPES)
245 goto out;
246
247
248 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
249 goto out;
250
251
252 if (dst->dev && (dst->dev->flags&IFF_LOOPBACK))
253 goto out;
254
255
256 if ((1 << type) & net->ipv4.sysctl_icmp_ratemask) {
257 struct inet_peer *peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, 1);
258 rc = inet_peer_xrlim_allow(peer,
259 net->ipv4.sysctl_icmp_ratelimit);
260 inet_putpeer(peer);
261 }
262out:
263 return rc;
264}
265
266
267
268
269void icmp_out_count(struct net *net, unsigned char type)
270{
271 ICMPMSGOUT_INC_STATS(net, type);
272 ICMP_INC_STATS(net, ICMP_MIB_OUTMSGS);
273}
274
275
276
277
278
279static int icmp_glue_bits(void *from, char *to, int offset, int len, int odd,
280 struct sk_buff *skb)
281{
282 struct icmp_bxm *icmp_param = (struct icmp_bxm *)from;
283 __wsum csum;
284
285 csum = skb_copy_and_csum_bits(icmp_param->skb,
286 icmp_param->offset + offset,
287 to, len, 0);
288
289 skb->csum = csum_block_add(skb->csum, csum, odd);
290 if (icmp_pointers[icmp_param->data.icmph.type].error)
291 nf_ct_attach(skb, icmp_param->skb);
292 return 0;
293}
294
295static void icmp_push_reply(struct icmp_bxm *icmp_param,
296 struct flowi4 *fl4,
297 struct ipcm_cookie *ipc, struct rtable **rt)
298{
299 struct sock *sk;
300 struct sk_buff *skb;
301
302 sk = icmp_sk(dev_net((*rt)->dst.dev));
303 if (ip_append_data(sk, fl4, icmp_glue_bits, icmp_param,
304 icmp_param->data_len+icmp_param->head_len,
305 icmp_param->head_len,
306 ipc, rt, MSG_DONTWAIT) < 0) {
307 ICMP_INC_STATS_BH(sock_net(sk), ICMP_MIB_OUTERRORS);
308 ip_flush_pending_frames(sk);
309 } else if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
310 struct icmphdr *icmph = icmp_hdr(skb);
311 __wsum csum = 0;
312 struct sk_buff *skb1;
313
314 skb_queue_walk(&sk->sk_write_queue, skb1) {
315 csum = csum_add(csum, skb1->csum);
316 }
317 csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
318 (char *)icmph,
319 icmp_param->head_len, csum);
320 icmph->checksum = csum_fold(csum);
321 skb->ip_summed = CHECKSUM_NONE;
322 ip_push_pending_frames(sk, fl4);
323 }
324}
325
326
327
328
329
330static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
331{
332 struct ipcm_cookie ipc;
333 struct rtable *rt = skb_rtable(skb);
334 struct net *net = dev_net(rt->dst.dev);
335 struct flowi4 fl4;
336 struct sock *sk;
337 struct inet_sock *inet;
338 __be32 daddr, saddr;
339
340 if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb))
341 return;
342
343 sk = icmp_xmit_lock(net);
344 if (sk == NULL)
345 return;
346 inet = inet_sk(sk);
347
348 icmp_param->data.icmph.checksum = 0;
349
350 inet->tos = ip_hdr(skb)->tos;
351 daddr = ipc.addr = ip_hdr(skb)->saddr;
352 saddr = fib_compute_spec_dst(skb);
353 ipc.opt = NULL;
354 ipc.tx_flags = 0;
355 if (icmp_param->replyopts.opt.opt.optlen) {
356 ipc.opt = &icmp_param->replyopts.opt;
357 if (ipc.opt->opt.srr)
358 daddr = icmp_param->replyopts.opt.opt.faddr;
359 }
360 memset(&fl4, 0, sizeof(fl4));
361 fl4.daddr = daddr;
362 fl4.saddr = saddr;
363 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
364 fl4.flowi4_proto = IPPROTO_ICMP;
365 security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
366 rt = ip_route_output_key(net, &fl4);
367 if (IS_ERR(rt))
368 goto out_unlock;
369 if (icmpv4_xrlim_allow(net, rt, &fl4, icmp_param->data.icmph.type,
370 icmp_param->data.icmph.code))
371 icmp_push_reply(icmp_param, &fl4, &ipc, &rt);
372 ip_rt_put(rt);
373out_unlock:
374 icmp_xmit_unlock(sk);
375}
376
377static struct rtable *icmp_route_lookup(struct net *net,
378 struct flowi4 *fl4,
379 struct sk_buff *skb_in,
380 const struct iphdr *iph,
381 __be32 saddr, u8 tos,
382 int type, int code,
383 struct icmp_bxm *param)
384{
385 struct rtable *rt, *rt2;
386 struct flowi4 fl4_dec;
387 int err;
388
389 memset(fl4, 0, sizeof(*fl4));
390 fl4->daddr = (param->replyopts.opt.opt.srr ?
391 param->replyopts.opt.opt.faddr : iph->saddr);
392 fl4->saddr = saddr;
393 fl4->flowi4_tos = RT_TOS(tos);
394 fl4->flowi4_proto = IPPROTO_ICMP;
395 fl4->fl4_icmp_type = type;
396 fl4->fl4_icmp_code = code;
397 security_skb_classify_flow(skb_in, flowi4_to_flowi(fl4));
398 rt = __ip_route_output_key(net, fl4);
399 if (IS_ERR(rt))
400 return rt;
401
402
403 rt2 = rt;
404
405 rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
406 flowi4_to_flowi(fl4), NULL, 0);
407 if (!IS_ERR(rt)) {
408 if (rt != rt2)
409 return rt;
410 } else if (PTR_ERR(rt) == -EPERM) {
411 rt = NULL;
412 } else
413 return rt;
414
415 err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(&fl4_dec), AF_INET);
416 if (err)
417 goto relookup_failed;
418
419 if (inet_addr_type(net, fl4_dec.saddr) == RTN_LOCAL) {
420 rt2 = __ip_route_output_key(net, &fl4_dec);
421 if (IS_ERR(rt2))
422 err = PTR_ERR(rt2);
423 } else {
424 struct flowi4 fl4_2 = {};
425 unsigned long orefdst;
426
427 fl4_2.daddr = fl4_dec.saddr;
428 rt2 = ip_route_output_key(net, &fl4_2);
429 if (IS_ERR(rt2)) {
430 err = PTR_ERR(rt2);
431 goto relookup_failed;
432 }
433
434 orefdst = skb_in->_skb_refdst;
435 err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
436 RT_TOS(tos), rt2->dst.dev);
437
438 dst_release(&rt2->dst);
439 rt2 = skb_rtable(skb_in);
440 skb_in->_skb_refdst = orefdst;
441 }
442
443 if (err)
444 goto relookup_failed;
445
446 rt2 = (struct rtable *) xfrm_lookup(net, &rt2->dst,
447 flowi4_to_flowi(&fl4_dec), NULL,
448 XFRM_LOOKUP_ICMP);
449 if (!IS_ERR(rt2)) {
450 dst_release(&rt->dst);
451 memcpy(fl4, &fl4_dec, sizeof(*fl4));
452 rt = rt2;
453 } else if (PTR_ERR(rt2) == -EPERM) {
454 if (rt)
455 dst_release(&rt->dst);
456 return rt2;
457 } else {
458 err = PTR_ERR(rt2);
459 goto relookup_failed;
460 }
461 return rt;
462
463relookup_failed:
464 if (rt)
465 return rt;
466 return ERR_PTR(err);
467}
468
469
470
471
472
473
474
475
476
477
478
479
480void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
481{
482 struct iphdr *iph;
483 int room;
484 struct icmp_bxm icmp_param;
485 struct rtable *rt = skb_rtable(skb_in);
486 struct ipcm_cookie ipc;
487 struct flowi4 fl4;
488 __be32 saddr;
489 u8 tos;
490 struct net *net;
491 struct sock *sk;
492
493 if (!rt)
494 goto out;
495 net = dev_net(rt->dst.dev);
496
497
498
499
500
501
502 iph = ip_hdr(skb_in);
503
504 if ((u8 *)iph < skb_in->head ||
505 (skb_in->network_header + sizeof(*iph)) > skb_in->tail)
506 goto out;
507
508
509
510
511 if (skb_in->pkt_type != PACKET_HOST)
512 goto out;
513
514
515
516
517 if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
518 goto out;
519
520
521
522
523
524 if (iph->frag_off & htons(IP_OFFSET))
525 goto out;
526
527
528
529
530 if (icmp_pointers[type].error) {
531
532
533
534
535 if (iph->protocol == IPPROTO_ICMP) {
536 u8 _inner_type, *itp;
537
538 itp = skb_header_pointer(skb_in,
539 skb_network_header(skb_in) +
540 (iph->ihl << 2) +
541 offsetof(struct icmphdr,
542 type) -
543 skb_in->data,
544 sizeof(_inner_type),
545 &_inner_type);
546 if (itp == NULL)
547 goto out;
548
549
550
551
552
553 if (*itp > NR_ICMP_TYPES ||
554 icmp_pointers[*itp].error)
555 goto out;
556 }
557 }
558
559 sk = icmp_xmit_lock(net);
560 if (sk == NULL)
561 return;
562
563
564
565
566
567 saddr = iph->daddr;
568 if (!(rt->rt_flags & RTCF_LOCAL)) {
569 struct net_device *dev = NULL;
570
571 rcu_read_lock();
572 if (rt_is_input_route(rt) &&
573 net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
574 dev = dev_get_by_index_rcu(net, inet_iif(skb_in));
575
576 if (dev)
577 saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
578 else
579 saddr = 0;
580 rcu_read_unlock();
581 }
582
583 tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) |
584 IPTOS_PREC_INTERNETCONTROL) :
585 iph->tos;
586
587 if (ip_options_echo(&icmp_param.replyopts.opt.opt, skb_in))
588 goto out_unlock;
589
590
591
592
593
594
595 icmp_param.data.icmph.type = type;
596 icmp_param.data.icmph.code = code;
597 icmp_param.data.icmph.un.gateway = info;
598 icmp_param.data.icmph.checksum = 0;
599 icmp_param.skb = skb_in;
600 icmp_param.offset = skb_network_offset(skb_in);
601 inet_sk(sk)->tos = tos;
602 ipc.addr = iph->saddr;
603 ipc.opt = &icmp_param.replyopts.opt;
604 ipc.tx_flags = 0;
605
606 rt = icmp_route_lookup(net, &fl4, skb_in, iph, saddr, tos,
607 type, code, &icmp_param);
608 if (IS_ERR(rt))
609 goto out_unlock;
610
611 if (!icmpv4_xrlim_allow(net, rt, &fl4, type, code))
612 goto ende;
613
614
615
616 room = dst_mtu(&rt->dst);
617 if (room > 576)
618 room = 576;
619 room -= sizeof(struct iphdr) + icmp_param.replyopts.opt.opt.optlen;
620 room -= sizeof(struct icmphdr);
621
622 icmp_param.data_len = skb_in->len - icmp_param.offset;
623 if (icmp_param.data_len > room)
624 icmp_param.data_len = room;
625 icmp_param.head_len = sizeof(struct icmphdr);
626
627 icmp_push_reply(&icmp_param, &fl4, &ipc, &rt);
628ende:
629 ip_rt_put(rt);
630out_unlock:
631 icmp_xmit_unlock(sk);
632out:;
633}
634EXPORT_SYMBOL(icmp_send);
635
636
637static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
638{
639 const struct iphdr *iph = (const struct iphdr *) skb->data;
640 const struct net_protocol *ipprot;
641 int protocol = iph->protocol;
642
643
644
645
646 if (!pskb_may_pull(skb, iph->ihl * 4 + 8))
647 return;
648
649 raw_icmp_error(skb, protocol, info);
650
651 rcu_read_lock();
652 ipprot = rcu_dereference(inet_protos[protocol]);
653 if (ipprot && ipprot->err_handler)
654 ipprot->err_handler(skb, info);
655 rcu_read_unlock();
656}
657
658
659
660
661
662static void icmp_unreach(struct sk_buff *skb)
663{
664 const struct iphdr *iph;
665 struct icmphdr *icmph;
666 struct net *net;
667 u32 info = 0;
668
669 net = dev_net(skb_dst(skb)->dev);
670
671
672
673
674
675
676
677 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
678 goto out_err;
679
680 icmph = icmp_hdr(skb);
681 iph = (const struct iphdr *)skb->data;
682
683 if (iph->ihl < 5)
684 goto out_err;
685
686 if (icmph->type == ICMP_DEST_UNREACH) {
687 switch (icmph->code & 15) {
688 case ICMP_NET_UNREACH:
689 case ICMP_HOST_UNREACH:
690 case ICMP_PROT_UNREACH:
691 case ICMP_PORT_UNREACH:
692 break;
693 case ICMP_FRAG_NEEDED:
694 if (ipv4_config.no_pmtu_disc) {
695 LIMIT_NETDEBUG(KERN_INFO pr_fmt("%pI4: fragmentation needed and DF set\n"),
696 &iph->daddr);
697 } else {
698 info = ntohs(icmph->un.frag.mtu);
699 if (!info)
700 goto out;
701 }
702 break;
703 case ICMP_SR_FAILED:
704 LIMIT_NETDEBUG(KERN_INFO pr_fmt("%pI4: Source Route Failed\n"),
705 &iph->daddr);
706 break;
707 default:
708 break;
709 }
710 if (icmph->code > NR_ICMP_UNREACH)
711 goto out;
712 } else if (icmph->type == ICMP_PARAMETERPROB)
713 info = ntohl(icmph->un.gateway) >> 24;
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733 if (!net->ipv4.sysctl_icmp_ignore_bogus_error_responses &&
734 inet_addr_type(net, iph->daddr) == RTN_BROADCAST) {
735 net_warn_ratelimited("%pI4 sent an invalid ICMP type %u, code %u error to a broadcast: %pI4 on %s\n",
736 &ip_hdr(skb)->saddr,
737 icmph->type, icmph->code,
738 &iph->daddr, skb->dev->name);
739 goto out;
740 }
741
742 icmp_socket_deliver(skb, info);
743
744out:
745 return;
746out_err:
747 ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
748 goto out;
749}
750
751
752
753
754
755
756static void icmp_redirect(struct sk_buff *skb)
757{
758 if (skb->len < sizeof(struct iphdr)) {
759 ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
760 return;
761 }
762
763 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
764 return;
765
766 icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway);
767}
768
769
770
771
772
773
774
775
776
777
778
779
780
781static void icmp_echo(struct sk_buff *skb)
782{
783 struct net *net;
784
785 net = dev_net(skb_dst(skb)->dev);
786 if (!net->ipv4.sysctl_icmp_echo_ignore_all) {
787 struct icmp_bxm icmp_param;
788
789 icmp_param.data.icmph = *icmp_hdr(skb);
790 icmp_param.data.icmph.type = ICMP_ECHOREPLY;
791 icmp_param.skb = skb;
792 icmp_param.offset = 0;
793 icmp_param.data_len = skb->len;
794 icmp_param.head_len = sizeof(struct icmphdr);
795 icmp_reply(&icmp_param, skb);
796 }
797}
798
799
800
801
802
803
804
805
806static void icmp_timestamp(struct sk_buff *skb)
807{
808 struct timespec tv;
809 struct icmp_bxm icmp_param;
810
811
812
813 if (skb->len < 4)
814 goto out_err;
815
816
817
818
819 getnstimeofday(&tv);
820 icmp_param.data.times[1] = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC +
821 tv.tv_nsec / NSEC_PER_MSEC);
822 icmp_param.data.times[2] = icmp_param.data.times[1];
823 if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4))
824 BUG();
825 icmp_param.data.icmph = *icmp_hdr(skb);
826 icmp_param.data.icmph.type = ICMP_TIMESTAMPREPLY;
827 icmp_param.data.icmph.code = 0;
828 icmp_param.skb = skb;
829 icmp_param.offset = 0;
830 icmp_param.data_len = 0;
831 icmp_param.head_len = sizeof(struct icmphdr) + 12;
832 icmp_reply(&icmp_param, skb);
833out:
834 return;
835out_err:
836 ICMP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ICMP_MIB_INERRORS);
837 goto out;
838}
839
840static void icmp_discard(struct sk_buff *skb)
841{
842}
843
844
845
846
847int icmp_rcv(struct sk_buff *skb)
848{
849 struct icmphdr *icmph;
850 struct rtable *rt = skb_rtable(skb);
851 struct net *net = dev_net(rt->dst.dev);
852
853 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
854 struct sec_path *sp = skb_sec_path(skb);
855 int nh;
856
857 if (!(sp && sp->xvec[sp->len - 1]->props.flags &
858 XFRM_STATE_ICMP))
859 goto drop;
860
861 if (!pskb_may_pull(skb, sizeof(*icmph) + sizeof(struct iphdr)))
862 goto drop;
863
864 nh = skb_network_offset(skb);
865 skb_set_network_header(skb, sizeof(*icmph));
866
867 if (!xfrm4_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
868 goto drop;
869
870 skb_set_network_header(skb, nh);
871 }
872
873 ICMP_INC_STATS_BH(net, ICMP_MIB_INMSGS);
874
875 switch (skb->ip_summed) {
876 case CHECKSUM_COMPLETE:
877 if (!csum_fold(skb->csum))
878 break;
879
880 case CHECKSUM_NONE:
881 skb->csum = 0;
882 if (__skb_checksum_complete(skb))
883 goto error;
884 }
885
886 if (!pskb_pull(skb, sizeof(*icmph)))
887 goto error;
888
889 icmph = icmp_hdr(skb);
890
891 ICMPMSGIN_INC_STATS_BH(net, icmph->type);
892
893
894
895
896
897
898 if (icmph->type > NR_ICMP_TYPES)
899 goto error;
900
901
902
903
904
905
906 if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) {
907
908
909
910
911
912
913 if ((icmph->type == ICMP_ECHO ||
914 icmph->type == ICMP_TIMESTAMP) &&
915 net->ipv4.sysctl_icmp_echo_ignore_broadcasts) {
916 goto error;
917 }
918 if (icmph->type != ICMP_ECHO &&
919 icmph->type != ICMP_TIMESTAMP &&
920 icmph->type != ICMP_ADDRESS &&
921 icmph->type != ICMP_ADDRESSREPLY) {
922 goto error;
923 }
924 }
925
926 icmp_pointers[icmph->type].handler(skb);
927
928drop:
929 kfree_skb(skb);
930 return 0;
931error:
932 ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
933 goto drop;
934}
935
936
937
938
939static const struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = {
940 [ICMP_ECHOREPLY] = {
941 .handler = ping_rcv,
942 },
943 [1] = {
944 .handler = icmp_discard,
945 .error = 1,
946 },
947 [2] = {
948 .handler = icmp_discard,
949 .error = 1,
950 },
951 [ICMP_DEST_UNREACH] = {
952 .handler = icmp_unreach,
953 .error = 1,
954 },
955 [ICMP_SOURCE_QUENCH] = {
956 .handler = icmp_unreach,
957 .error = 1,
958 },
959 [ICMP_REDIRECT] = {
960 .handler = icmp_redirect,
961 .error = 1,
962 },
963 [6] = {
964 .handler = icmp_discard,
965 .error = 1,
966 },
967 [7] = {
968 .handler = icmp_discard,
969 .error = 1,
970 },
971 [ICMP_ECHO] = {
972 .handler = icmp_echo,
973 },
974 [9] = {
975 .handler = icmp_discard,
976 .error = 1,
977 },
978 [10] = {
979 .handler = icmp_discard,
980 .error = 1,
981 },
982 [ICMP_TIME_EXCEEDED] = {
983 .handler = icmp_unreach,
984 .error = 1,
985 },
986 [ICMP_PARAMETERPROB] = {
987 .handler = icmp_unreach,
988 .error = 1,
989 },
990 [ICMP_TIMESTAMP] = {
991 .handler = icmp_timestamp,
992 },
993 [ICMP_TIMESTAMPREPLY] = {
994 .handler = icmp_discard,
995 },
996 [ICMP_INFO_REQUEST] = {
997 .handler = icmp_discard,
998 },
999 [ICMP_INFO_REPLY] = {
1000 .handler = icmp_discard,
1001 },
1002 [ICMP_ADDRESS] = {
1003 .handler = icmp_discard,
1004 },
1005 [ICMP_ADDRESSREPLY] = {
1006 .handler = icmp_discard,
1007 },
1008};
1009
1010static void __net_exit icmp_sk_exit(struct net *net)
1011{
1012 int i;
1013
1014 for_each_possible_cpu(i)
1015 inet_ctl_sock_destroy(net->ipv4.icmp_sk[i]);
1016 kfree(net->ipv4.icmp_sk);
1017 net->ipv4.icmp_sk = NULL;
1018}
1019
1020static int __net_init icmp_sk_init(struct net *net)
1021{
1022 int i, err;
1023
1024 net->ipv4.icmp_sk =
1025 kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
1026 if (net->ipv4.icmp_sk == NULL)
1027 return -ENOMEM;
1028
1029 for_each_possible_cpu(i) {
1030 struct sock *sk;
1031
1032 err = inet_ctl_sock_create(&sk, PF_INET,
1033 SOCK_RAW, IPPROTO_ICMP, net);
1034 if (err < 0)
1035 goto fail;
1036
1037 net->ipv4.icmp_sk[i] = sk;
1038
1039
1040
1041
1042 sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
1043
1044
1045
1046
1047 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1048 inet_sk(sk)->pmtudisc = IP_PMTUDISC_DONT;
1049 }
1050
1051
1052 net->ipv4.sysctl_icmp_echo_ignore_all = 0;
1053 net->ipv4.sysctl_icmp_echo_ignore_broadcasts = 1;
1054
1055
1056 net->ipv4.sysctl_icmp_ignore_bogus_error_responses = 1;
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070 net->ipv4.sysctl_icmp_ratelimit = 1 * HZ;
1071 net->ipv4.sysctl_icmp_ratemask = 0x1818;
1072 net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr = 0;
1073
1074 return 0;
1075
1076fail:
1077 for_each_possible_cpu(i)
1078 inet_ctl_sock_destroy(net->ipv4.icmp_sk[i]);
1079 kfree(net->ipv4.icmp_sk);
1080 return err;
1081}
1082
1083static struct pernet_operations __net_initdata icmp_sk_ops = {
1084 .init = icmp_sk_init,
1085 .exit = icmp_sk_exit,
1086};
1087
1088int __init icmp_init(void)
1089{
1090 return register_pernet_subsys(&icmp_sk_ops);
1091}
1092