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31
32#define pr_fmt(fmt) "IPv6: " fmt
33
34#include <linux/module.h>
35#include <linux/errno.h>
36#include <linux/types.h>
37#include <linux/socket.h>
38#include <linux/in.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>
46
47#ifdef CONFIG_SYSCTL
48#include <linux/sysctl.h>
49#endif
50
51#include <linux/inet.h>
52#include <linux/netdevice.h>
53#include <linux/icmpv6.h>
54
55#include <net/ip.h>
56#include <net/sock.h>
57
58#include <net/ipv6.h>
59#include <net/ip6_checksum.h>
60#include <net/protocol.h>
61#include <net/raw.h>
62#include <net/rawv6.h>
63#include <net/transp_v6.h>
64#include <net/ip6_route.h>
65#include <net/addrconf.h>
66#include <net/icmp.h>
67#include <net/xfrm.h>
68#include <net/inet_common.h>
69
70#include <asm/uaccess.h>
71
72
73
74
75
76
77
78
79static inline struct sock *icmpv6_sk(struct net *net)
80{
81 return net->ipv6.icmp_sk[smp_processor_id()];
82}
83
84static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
85 u8 type, u8 code, int offset, __be32 info)
86{
87 struct net *net = dev_net(skb->dev);
88
89 if (type == ICMPV6_PKT_TOOBIG)
90 ip6_update_pmtu(skb, net, info, 0, 0);
91 else if (type == NDISC_REDIRECT)
92 ip6_redirect(skb, net, 0, 0);
93}
94
95static int icmpv6_rcv(struct sk_buff *skb);
96
97static const struct inet6_protocol icmpv6_protocol = {
98 .handler = icmpv6_rcv,
99 .err_handler = icmpv6_err,
100 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
101};
102
103static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
104{
105 struct sock *sk;
106
107 local_bh_disable();
108
109 sk = icmpv6_sk(net);
110 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
111
112
113
114
115 local_bh_enable();
116 return NULL;
117 }
118 return sk;
119}
120
121static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
122{
123 spin_unlock_bh(&sk->sk_lock.slock);
124}
125
126
127
128
129void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
130{
131 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
132 kfree_skb(skb);
133}
134
135
136
137
138
139
140
141
142
143
144
145
146static bool is_ineligible(const struct sk_buff *skb)
147{
148 int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
149 int len = skb->len - ptr;
150 __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
151 __be16 frag_off;
152
153 if (len < 0)
154 return true;
155
156 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
157 if (ptr < 0)
158 return false;
159 if (nexthdr == IPPROTO_ICMPV6) {
160 u8 _type, *tp;
161 tp = skb_header_pointer(skb,
162 ptr+offsetof(struct icmp6hdr, icmp6_type),
163 sizeof(_type), &_type);
164 if (tp == NULL ||
165 !(*tp & ICMPV6_INFOMSG_MASK))
166 return true;
167 }
168 return false;
169}
170
171
172
173
174static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
175 struct flowi6 *fl6)
176{
177 struct dst_entry *dst;
178 struct net *net = sock_net(sk);
179 bool res = false;
180
181
182 if (type & ICMPV6_INFOMSG_MASK)
183 return true;
184
185
186 if (type == ICMPV6_PKT_TOOBIG)
187 return true;
188
189
190
191
192
193
194 dst = ip6_route_output(net, sk, fl6);
195 if (dst->error) {
196 IP6_INC_STATS(net, ip6_dst_idev(dst),
197 IPSTATS_MIB_OUTNOROUTES);
198 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
199 res = true;
200 } else {
201 struct rt6_info *rt = (struct rt6_info *)dst;
202 int tmo = net->ipv6.sysctl.icmpv6_time;
203 struct inet_peer *peer;
204
205
206 if (rt->rt6i_dst.plen < 128)
207 tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
208
209 peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
210 res = inet_peer_xrlim_allow(peer, tmo);
211 if (peer)
212 inet_putpeer(peer);
213 }
214 dst_release(dst);
215 return res;
216}
217
218
219
220
221
222
223
224
225static bool opt_unrec(struct sk_buff *skb, __u32 offset)
226{
227 u8 _optval, *op;
228
229 offset += skb_network_offset(skb);
230 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
231 if (op == NULL)
232 return true;
233 return (*op & 0xC0) == 0x80;
234}
235
236static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len)
237{
238 struct sk_buff *skb;
239 struct icmp6hdr *icmp6h;
240 int err = 0;
241
242 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
243 goto out;
244
245 icmp6h = icmp6_hdr(skb);
246 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
247 icmp6h->icmp6_cksum = 0;
248
249 if (skb_queue_len(&sk->sk_write_queue) == 1) {
250 skb->csum = csum_partial(icmp6h,
251 sizeof(struct icmp6hdr), skb->csum);
252 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
253 &fl6->daddr,
254 len, fl6->flowi6_proto,
255 skb->csum);
256 } else {
257 __wsum tmp_csum = 0;
258
259 skb_queue_walk(&sk->sk_write_queue, skb) {
260 tmp_csum = csum_add(tmp_csum, skb->csum);
261 }
262
263 tmp_csum = csum_partial(icmp6h,
264 sizeof(struct icmp6hdr), tmp_csum);
265 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
266 &fl6->daddr,
267 len, fl6->flowi6_proto,
268 tmp_csum);
269 }
270 ip6_push_pending_frames(sk);
271out:
272 return err;
273}
274
275struct icmpv6_msg {
276 struct sk_buff *skb;
277 int offset;
278 uint8_t type;
279};
280
281static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
282{
283 struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
284 struct sk_buff *org_skb = msg->skb;
285 __wsum csum = 0;
286
287 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
288 to, len, csum);
289 skb->csum = csum_block_add(skb->csum, csum, odd);
290 if (!(msg->type & ICMPV6_INFOMSG_MASK))
291 nf_ct_attach(skb, org_skb);
292 return 0;
293}
294
295#if IS_ENABLED(CONFIG_IPV6_MIP6)
296static void mip6_addr_swap(struct sk_buff *skb)
297{
298 struct ipv6hdr *iph = ipv6_hdr(skb);
299 struct inet6_skb_parm *opt = IP6CB(skb);
300 struct ipv6_destopt_hao *hao;
301 struct in6_addr tmp;
302 int off;
303
304 if (opt->dsthao) {
305 off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
306 if (likely(off >= 0)) {
307 hao = (struct ipv6_destopt_hao *)
308 (skb_network_header(skb) + off);
309 tmp = iph->saddr;
310 iph->saddr = hao->addr;
311 hao->addr = tmp;
312 }
313 }
314}
315#else
316static inline void mip6_addr_swap(struct sk_buff *skb) {}
317#endif
318
319static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
320 struct sock *sk, struct flowi6 *fl6)
321{
322 struct dst_entry *dst, *dst2;
323 struct flowi6 fl2;
324 int err;
325
326 err = ip6_dst_lookup(sk, &dst, fl6);
327 if (err)
328 return ERR_PTR(err);
329
330
331
332
333
334 if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
335 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
336 dst_release(dst);
337 return ERR_PTR(-EINVAL);
338 }
339
340
341 dst2 = dst;
342
343 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
344 if (!IS_ERR(dst)) {
345 if (dst != dst2)
346 return dst;
347 } else {
348 if (PTR_ERR(dst) == -EPERM)
349 dst = NULL;
350 else
351 return dst;
352 }
353
354 err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
355 if (err)
356 goto relookup_failed;
357
358 err = ip6_dst_lookup(sk, &dst2, &fl2);
359 if (err)
360 goto relookup_failed;
361
362 dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
363 if (!IS_ERR(dst2)) {
364 dst_release(dst);
365 dst = dst2;
366 } else {
367 err = PTR_ERR(dst2);
368 if (err == -EPERM) {
369 dst_release(dst);
370 return dst2;
371 } else
372 goto relookup_failed;
373 }
374
375relookup_failed:
376 if (dst)
377 return dst;
378 return ERR_PTR(err);
379}
380
381
382
383
384void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
385{
386 struct net *net = dev_net(skb->dev);
387 struct inet6_dev *idev = NULL;
388 struct ipv6hdr *hdr = ipv6_hdr(skb);
389 struct sock *sk;
390 struct ipv6_pinfo *np;
391 const struct in6_addr *saddr = NULL;
392 struct dst_entry *dst;
393 struct icmp6hdr tmp_hdr;
394 struct flowi6 fl6;
395 struct icmpv6_msg msg;
396 int iif = 0;
397 int addr_type = 0;
398 int len;
399 int hlimit;
400 int err = 0;
401
402 if ((u8 *)hdr < skb->head ||
403 (skb->network_header + sizeof(*hdr)) > skb->tail)
404 return;
405
406
407
408
409
410
411
412 addr_type = ipv6_addr_type(&hdr->daddr);
413
414 if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0))
415 saddr = &hdr->daddr;
416
417
418
419
420
421 if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
422 if (type != ICMPV6_PKT_TOOBIG &&
423 !(type == ICMPV6_PARAMPROB &&
424 code == ICMPV6_UNK_OPTION &&
425 (opt_unrec(skb, info))))
426 return;
427
428 saddr = NULL;
429 }
430
431 addr_type = ipv6_addr_type(&hdr->saddr);
432
433
434
435
436
437 if (addr_type & IPV6_ADDR_LINKLOCAL)
438 iif = skb->dev->ifindex;
439
440
441
442
443
444
445
446 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
447 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
448 return;
449 }
450
451
452
453
454 if (is_ineligible(skb)) {
455 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
456 return;
457 }
458
459 mip6_addr_swap(skb);
460
461 memset(&fl6, 0, sizeof(fl6));
462 fl6.flowi6_proto = IPPROTO_ICMPV6;
463 fl6.daddr = hdr->saddr;
464 if (saddr)
465 fl6.saddr = *saddr;
466 fl6.flowi6_oif = iif;
467 fl6.fl6_icmp_type = type;
468 fl6.fl6_icmp_code = code;
469 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
470
471 sk = icmpv6_xmit_lock(net);
472 if (sk == NULL)
473 return;
474 np = inet6_sk(sk);
475
476 if (!icmpv6_xrlim_allow(sk, type, &fl6))
477 goto out;
478
479 tmp_hdr.icmp6_type = type;
480 tmp_hdr.icmp6_code = code;
481 tmp_hdr.icmp6_cksum = 0;
482 tmp_hdr.icmp6_pointer = htonl(info);
483
484 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
485 fl6.flowi6_oif = np->mcast_oif;
486 else if (!fl6.flowi6_oif)
487 fl6.flowi6_oif = np->ucast_oif;
488
489 dst = icmpv6_route_lookup(net, skb, sk, &fl6);
490 if (IS_ERR(dst))
491 goto out;
492
493 if (ipv6_addr_is_multicast(&fl6.daddr))
494 hlimit = np->mcast_hops;
495 else
496 hlimit = np->hop_limit;
497 if (hlimit < 0)
498 hlimit = ip6_dst_hoplimit(dst);
499
500 msg.skb = skb;
501 msg.offset = skb_network_offset(skb);
502 msg.type = type;
503
504 len = skb->len - msg.offset;
505 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
506 if (len < 0) {
507 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n");
508 goto out_dst_release;
509 }
510
511 rcu_read_lock();
512 idev = __in6_dev_get(skb->dev);
513
514 err = ip6_append_data(sk, icmpv6_getfrag, &msg,
515 len + sizeof(struct icmp6hdr),
516 sizeof(struct icmp6hdr), hlimit,
517 np->tclass, NULL, &fl6, (struct rt6_info *)dst,
518 MSG_DONTWAIT, np->dontfrag);
519 if (err) {
520 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
521 ip6_flush_pending_frames(sk);
522 } else {
523 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
524 len + sizeof(struct icmp6hdr));
525 }
526 rcu_read_unlock();
527out_dst_release:
528 dst_release(dst);
529out:
530 icmpv6_xmit_unlock(sk);
531}
532EXPORT_SYMBOL(icmpv6_send);
533
534static void icmpv6_echo_reply(struct sk_buff *skb)
535{
536 struct net *net = dev_net(skb->dev);
537 struct sock *sk;
538 struct inet6_dev *idev;
539 struct ipv6_pinfo *np;
540 const struct in6_addr *saddr = NULL;
541 struct icmp6hdr *icmph = icmp6_hdr(skb);
542 struct icmp6hdr tmp_hdr;
543 struct flowi6 fl6;
544 struct icmpv6_msg msg;
545 struct dst_entry *dst;
546 int err = 0;
547 int hlimit;
548
549 saddr = &ipv6_hdr(skb)->daddr;
550
551 if (!ipv6_unicast_destination(skb))
552 saddr = NULL;
553
554 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
555 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
556
557 memset(&fl6, 0, sizeof(fl6));
558 fl6.flowi6_proto = IPPROTO_ICMPV6;
559 fl6.daddr = ipv6_hdr(skb)->saddr;
560 if (saddr)
561 fl6.saddr = *saddr;
562 fl6.flowi6_oif = skb->dev->ifindex;
563 fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
564 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
565
566 sk = icmpv6_xmit_lock(net);
567 if (sk == NULL)
568 return;
569 np = inet6_sk(sk);
570
571 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
572 fl6.flowi6_oif = np->mcast_oif;
573 else if (!fl6.flowi6_oif)
574 fl6.flowi6_oif = np->ucast_oif;
575
576 err = ip6_dst_lookup(sk, &dst, &fl6);
577 if (err)
578 goto out;
579 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
580 if (IS_ERR(dst))
581 goto out;
582
583 if (ipv6_addr_is_multicast(&fl6.daddr))
584 hlimit = np->mcast_hops;
585 else
586 hlimit = np->hop_limit;
587 if (hlimit < 0)
588 hlimit = ip6_dst_hoplimit(dst);
589
590 idev = __in6_dev_get(skb->dev);
591
592 msg.skb = skb;
593 msg.offset = 0;
594 msg.type = ICMPV6_ECHO_REPLY;
595
596 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
597 sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6,
598 (struct rt6_info *)dst, MSG_DONTWAIT,
599 np->dontfrag);
600
601 if (err) {
602 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
603 ip6_flush_pending_frames(sk);
604 } else {
605 err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
606 skb->len + sizeof(struct icmp6hdr));
607 }
608 dst_release(dst);
609out:
610 icmpv6_xmit_unlock(sk);
611}
612
613void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
614{
615 const struct inet6_protocol *ipprot;
616 int inner_offset;
617 __be16 frag_off;
618 u8 nexthdr;
619
620 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
621 return;
622
623 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
624 if (ipv6_ext_hdr(nexthdr)) {
625
626 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
627 &nexthdr, &frag_off);
628 if (inner_offset<0)
629 return;
630 } else {
631 inner_offset = sizeof(struct ipv6hdr);
632 }
633
634
635 if (!pskb_may_pull(skb, inner_offset+8))
636 return;
637
638
639
640
641
642
643
644
645 rcu_read_lock();
646 ipprot = rcu_dereference(inet6_protos[nexthdr]);
647 if (ipprot && ipprot->err_handler)
648 ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
649 rcu_read_unlock();
650
651 raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
652}
653
654
655
656
657
658static int icmpv6_rcv(struct sk_buff *skb)
659{
660 struct net_device *dev = skb->dev;
661 struct inet6_dev *idev = __in6_dev_get(dev);
662 const struct in6_addr *saddr, *daddr;
663 struct icmp6hdr *hdr;
664 u8 type;
665
666 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
667 struct sec_path *sp = skb_sec_path(skb);
668 int nh;
669
670 if (!(sp && sp->xvec[sp->len - 1]->props.flags &
671 XFRM_STATE_ICMP))
672 goto drop_no_count;
673
674 if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
675 goto drop_no_count;
676
677 nh = skb_network_offset(skb);
678 skb_set_network_header(skb, sizeof(*hdr));
679
680 if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
681 goto drop_no_count;
682
683 skb_set_network_header(skb, nh);
684 }
685
686 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS);
687
688 saddr = &ipv6_hdr(skb)->saddr;
689 daddr = &ipv6_hdr(skb)->daddr;
690
691
692 switch (skb->ip_summed) {
693 case CHECKSUM_COMPLETE:
694 if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
695 skb->csum))
696 break;
697
698 case CHECKSUM_NONE:
699 skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
700 IPPROTO_ICMPV6, 0));
701 if (__skb_checksum_complete(skb)) {
702 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n",
703 saddr, daddr);
704 goto discard_it;
705 }
706 }
707
708 if (!pskb_pull(skb, sizeof(*hdr)))
709 goto discard_it;
710
711 hdr = icmp6_hdr(skb);
712
713 type = hdr->icmp6_type;
714
715 ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type);
716
717 switch (type) {
718 case ICMPV6_ECHO_REQUEST:
719 icmpv6_echo_reply(skb);
720 break;
721
722 case ICMPV6_ECHO_REPLY:
723
724 break;
725
726 case ICMPV6_PKT_TOOBIG:
727
728
729
730
731
732 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
733 goto discard_it;
734 hdr = icmp6_hdr(skb);
735
736
737
738
739
740 case ICMPV6_DEST_UNREACH:
741 case ICMPV6_TIME_EXCEED:
742 case ICMPV6_PARAMPROB:
743 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
744 break;
745
746 case NDISC_ROUTER_SOLICITATION:
747 case NDISC_ROUTER_ADVERTISEMENT:
748 case NDISC_NEIGHBOUR_SOLICITATION:
749 case NDISC_NEIGHBOUR_ADVERTISEMENT:
750 case NDISC_REDIRECT:
751 ndisc_rcv(skb);
752 break;
753
754 case ICMPV6_MGM_QUERY:
755 igmp6_event_query(skb);
756 break;
757
758 case ICMPV6_MGM_REPORT:
759 igmp6_event_report(skb);
760 break;
761
762 case ICMPV6_MGM_REDUCTION:
763 case ICMPV6_NI_QUERY:
764 case ICMPV6_NI_REPLY:
765 case ICMPV6_MLD2_REPORT:
766 case ICMPV6_DHAAD_REQUEST:
767 case ICMPV6_DHAAD_REPLY:
768 case ICMPV6_MOBILE_PREFIX_SOL:
769 case ICMPV6_MOBILE_PREFIX_ADV:
770 break;
771
772 default:
773 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n");
774
775
776 if (type & ICMPV6_INFOMSG_MASK)
777 break;
778
779
780
781
782
783
784 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
785 }
786
787 kfree_skb(skb);
788 return 0;
789
790discard_it:
791 ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS);
792drop_no_count:
793 kfree_skb(skb);
794 return 0;
795}
796
797void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
798 u8 type,
799 const struct in6_addr *saddr,
800 const struct in6_addr *daddr,
801 int oif)
802{
803 memset(fl6, 0, sizeof(*fl6));
804 fl6->saddr = *saddr;
805 fl6->daddr = *daddr;
806 fl6->flowi6_proto = IPPROTO_ICMPV6;
807 fl6->fl6_icmp_type = type;
808 fl6->fl6_icmp_code = 0;
809 fl6->flowi6_oif = oif;
810 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
811}
812
813
814
815
816static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
817
818static int __net_init icmpv6_sk_init(struct net *net)
819{
820 struct sock *sk;
821 int err, i, j;
822
823 net->ipv6.icmp_sk =
824 kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
825 if (net->ipv6.icmp_sk == NULL)
826 return -ENOMEM;
827
828 for_each_possible_cpu(i) {
829 err = inet_ctl_sock_create(&sk, PF_INET6,
830 SOCK_RAW, IPPROTO_ICMPV6, net);
831 if (err < 0) {
832 pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
833 err);
834 goto fail;
835 }
836
837 net->ipv6.icmp_sk[i] = sk;
838
839
840
841
842
843
844
845 lockdep_set_class(&sk->sk_dst_lock,
846 &icmpv6_socket_sk_dst_lock_key);
847
848
849
850
851 sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
852 }
853 return 0;
854
855 fail:
856 for (j = 0; j < i; j++)
857 inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
858 kfree(net->ipv6.icmp_sk);
859 return err;
860}
861
862static void __net_exit icmpv6_sk_exit(struct net *net)
863{
864 int i;
865
866 for_each_possible_cpu(i) {
867 inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
868 }
869 kfree(net->ipv6.icmp_sk);
870}
871
872static struct pernet_operations icmpv6_sk_ops = {
873 .init = icmpv6_sk_init,
874 .exit = icmpv6_sk_exit,
875};
876
877int __init icmpv6_init(void)
878{
879 int err;
880
881 err = register_pernet_subsys(&icmpv6_sk_ops);
882 if (err < 0)
883 return err;
884
885 err = -EAGAIN;
886 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
887 goto fail;
888 return 0;
889
890fail:
891 pr_err("Failed to register ICMP6 protocol\n");
892 unregister_pernet_subsys(&icmpv6_sk_ops);
893 return err;
894}
895
896void icmpv6_cleanup(void)
897{
898 unregister_pernet_subsys(&icmpv6_sk_ops);
899 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
900}
901
902
903static const struct icmp6_err {
904 int err;
905 int fatal;
906} tab_unreach[] = {
907 {
908 .err = ENETUNREACH,
909 .fatal = 0,
910 },
911 {
912 .err = EACCES,
913 .fatal = 1,
914 },
915 {
916 .err = EHOSTUNREACH,
917 .fatal = 0,
918 },
919 {
920 .err = EHOSTUNREACH,
921 .fatal = 0,
922 },
923 {
924 .err = ECONNREFUSED,
925 .fatal = 1,
926 },
927};
928
929int icmpv6_err_convert(u8 type, u8 code, int *err)
930{
931 int fatal = 0;
932
933 *err = EPROTO;
934
935 switch (type) {
936 case ICMPV6_DEST_UNREACH:
937 fatal = 1;
938 if (code <= ICMPV6_PORT_UNREACH) {
939 *err = tab_unreach[code].err;
940 fatal = tab_unreach[code].fatal;
941 }
942 break;
943
944 case ICMPV6_PKT_TOOBIG:
945 *err = EMSGSIZE;
946 break;
947
948 case ICMPV6_PARAMPROB:
949 *err = EPROTO;
950 fatal = 1;
951 break;
952
953 case ICMPV6_TIME_EXCEED:
954 *err = EHOSTUNREACH;
955 break;
956 }
957
958 return fatal;
959}
960EXPORT_SYMBOL(icmpv6_err_convert);
961
962#ifdef CONFIG_SYSCTL
963ctl_table ipv6_icmp_table_template[] = {
964 {
965 .procname = "ratelimit",
966 .data = &init_net.ipv6.sysctl.icmpv6_time,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec_ms_jiffies,
970 },
971 { },
972};
973
974struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
975{
976 struct ctl_table *table;
977
978 table = kmemdup(ipv6_icmp_table_template,
979 sizeof(ipv6_icmp_table_template),
980 GFP_KERNEL);
981
982 if (table)
983 table[0].data = &net->ipv6.sysctl.icmpv6_time;
984
985 return table;
986}
987#endif
988
989