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30#define ND_DEBUG 1
31
32#define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
33#define ND_NOPRINTK(x...) do { ; } while(0)
34#define ND_PRINTK0 ND_PRINTK
35#define ND_PRINTK1 ND_NOPRINTK
36#define ND_PRINTK2 ND_NOPRINTK
37#define ND_PRINTK3 ND_NOPRINTK
38#if ND_DEBUG >= 1
39#undef ND_PRINTK1
40#define ND_PRINTK1 ND_PRINTK
41#endif
42#if ND_DEBUG >= 2
43#undef ND_PRINTK2
44#define ND_PRINTK2 ND_PRINTK
45#endif
46#if ND_DEBUG >= 3
47#undef ND_PRINTK3
48#define ND_PRINTK3 ND_PRINTK
49#endif
50
51#include <linux/module.h>
52#include <linux/errno.h>
53#include <linux/types.h>
54#include <linux/socket.h>
55#include <linux/sockios.h>
56#include <linux/sched.h>
57#include <linux/net.h>
58#include <linux/in6.h>
59#include <linux/route.h>
60#include <linux/init.h>
61#include <linux/rcupdate.h>
62#include <linux/slab.h>
63#ifdef CONFIG_SYSCTL
64#include <linux/sysctl.h>
65#endif
66
67#include <linux/if_addr.h>
68#include <linux/if_arp.h>
69#include <linux/ipv6.h>
70#include <linux/icmpv6.h>
71#include <linux/jhash.h>
72
73#include <net/sock.h>
74#include <net/snmp.h>
75
76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/icmp.h>
82
83#include <net/netlink.h>
84#include <linux/rtnetlink.h>
85
86#include <net/flow.h>
87#include <net/ip6_checksum.h>
88#include <net/inet_common.h>
89#include <linux/proc_fs.h>
90
91#include <linux/netfilter.h>
92#include <linux/netfilter_ipv6.h>
93
94static u32 ndisc_hash(const void *pkey,
95 const struct net_device *dev,
96 __u32 rnd);
97static int ndisc_constructor(struct neighbour *neigh);
98static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
99static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
100static int pndisc_constructor(struct pneigh_entry *n);
101static void pndisc_destructor(struct pneigh_entry *n);
102static void pndisc_redo(struct sk_buff *skb);
103
104static const struct neigh_ops ndisc_generic_ops = {
105 .family = AF_INET6,
106 .solicit = ndisc_solicit,
107 .error_report = ndisc_error_report,
108 .output = neigh_resolve_output,
109 .connected_output = neigh_connected_output,
110 .hh_output = dev_queue_xmit,
111 .queue_xmit = dev_queue_xmit,
112};
113
114static const struct neigh_ops ndisc_hh_ops = {
115 .family = AF_INET6,
116 .solicit = ndisc_solicit,
117 .error_report = ndisc_error_report,
118 .output = neigh_resolve_output,
119 .connected_output = neigh_resolve_output,
120 .hh_output = dev_queue_xmit,
121 .queue_xmit = dev_queue_xmit,
122};
123
124
125static const struct neigh_ops ndisc_direct_ops = {
126 .family = AF_INET6,
127 .output = dev_queue_xmit,
128 .connected_output = dev_queue_xmit,
129 .hh_output = dev_queue_xmit,
130 .queue_xmit = dev_queue_xmit,
131};
132
133struct neigh_table nd_tbl = {
134 .family = AF_INET6,
135 .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr),
136 .key_len = sizeof(struct in6_addr),
137 .hash = ndisc_hash,
138 .constructor = ndisc_constructor,
139 .pconstructor = pndisc_constructor,
140 .pdestructor = pndisc_destructor,
141 .proxy_redo = pndisc_redo,
142 .id = "ndisc_cache",
143 .parms = {
144 .tbl = &nd_tbl,
145 .base_reachable_time = ND_REACHABLE_TIME,
146 .retrans_time = ND_RETRANS_TIMER,
147 .gc_staletime = 60 * HZ,
148 .reachable_time = ND_REACHABLE_TIME,
149 .delay_probe_time = 5 * HZ,
150 .queue_len = 3,
151 .ucast_probes = 3,
152 .mcast_probes = 3,
153 .anycast_delay = 1 * HZ,
154 .proxy_delay = (8 * HZ) / 10,
155 .proxy_qlen = 64,
156 },
157 .gc_interval = 30 * HZ,
158 .gc_thresh1 = 128,
159 .gc_thresh2 = 512,
160 .gc_thresh3 = 1024,
161};
162
163
164struct ndisc_options {
165 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
166#ifdef CONFIG_IPV6_ROUTE_INFO
167 struct nd_opt_hdr *nd_opts_ri;
168 struct nd_opt_hdr *nd_opts_ri_end;
169#endif
170 struct nd_opt_hdr *nd_useropts;
171 struct nd_opt_hdr *nd_useropts_end;
172};
173
174#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
175#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
176#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
177#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
178#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
179#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
180
181#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
182
183
184
185
186
187
188
189static int ndisc_addr_option_pad(unsigned short type)
190{
191 switch (type) {
192 case ARPHRD_INFINIBAND: return 2;
193 default: return 0;
194 }
195}
196
197static inline int ndisc_opt_addr_space(struct net_device *dev)
198{
199 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
200}
201
202static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
203 unsigned short addr_type)
204{
205 int space = NDISC_OPT_SPACE(data_len);
206 int pad = ndisc_addr_option_pad(addr_type);
207
208 opt[0] = type;
209 opt[1] = space>>3;
210
211 memset(opt + 2, 0, pad);
212 opt += pad;
213 space -= pad;
214
215 memcpy(opt+2, data, data_len);
216 data_len += 2;
217 opt += data_len;
218 if ((space -= data_len) > 0)
219 memset(opt, 0, space);
220 return opt + space;
221}
222
223static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
224 struct nd_opt_hdr *end)
225{
226 int type;
227 if (!cur || !end || cur >= end)
228 return NULL;
229 type = cur->nd_opt_type;
230 do {
231 cur = ((void *)cur) + (cur->nd_opt_len << 3);
232 } while(cur < end && cur->nd_opt_type != type);
233 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
234}
235
236static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
237{
238 return opt->nd_opt_type == ND_OPT_RDNSS;
239}
240
241static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
242 struct nd_opt_hdr *end)
243{
244 if (!cur || !end || cur >= end)
245 return NULL;
246 do {
247 cur = ((void *)cur) + (cur->nd_opt_len << 3);
248 } while(cur < end && !ndisc_is_useropt(cur));
249 return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
250}
251
252static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
253 struct ndisc_options *ndopts)
254{
255 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
256
257 if (!nd_opt || opt_len < 0 || !ndopts)
258 return NULL;
259 memset(ndopts, 0, sizeof(*ndopts));
260 while (opt_len) {
261 int l;
262 if (opt_len < sizeof(struct nd_opt_hdr))
263 return NULL;
264 l = nd_opt->nd_opt_len << 3;
265 if (opt_len < l || l == 0)
266 return NULL;
267 switch (nd_opt->nd_opt_type) {
268 case ND_OPT_SOURCE_LL_ADDR:
269 case ND_OPT_TARGET_LL_ADDR:
270 case ND_OPT_MTU:
271 case ND_OPT_REDIRECT_HDR:
272 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
273 ND_PRINTK2(KERN_WARNING
274 "%s(): duplicated ND6 option found: type=%d\n",
275 __func__,
276 nd_opt->nd_opt_type);
277 } else {
278 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
279 }
280 break;
281 case ND_OPT_PREFIX_INFO:
282 ndopts->nd_opts_pi_end = nd_opt;
283 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
284 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
285 break;
286#ifdef CONFIG_IPV6_ROUTE_INFO
287 case ND_OPT_ROUTE_INFO:
288 ndopts->nd_opts_ri_end = nd_opt;
289 if (!ndopts->nd_opts_ri)
290 ndopts->nd_opts_ri = nd_opt;
291 break;
292#endif
293 default:
294 if (ndisc_is_useropt(nd_opt)) {
295 ndopts->nd_useropts_end = nd_opt;
296 if (!ndopts->nd_useropts)
297 ndopts->nd_useropts = nd_opt;
298 } else {
299
300
301
302
303
304 ND_PRINTK2(KERN_NOTICE
305 "%s(): ignored unsupported option; type=%d, len=%d\n",
306 __func__,
307 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
308 }
309 }
310 opt_len -= l;
311 nd_opt = ((void *)nd_opt) + l;
312 }
313 return ndopts;
314}
315
316static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
317 struct net_device *dev)
318{
319 u8 *lladdr = (u8 *)(p + 1);
320 int lladdrlen = p->nd_opt_len << 3;
321 int prepad = ndisc_addr_option_pad(dev->type);
322 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
323 return NULL;
324 return lladdr + prepad;
325}
326
327int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
328{
329 switch (dev->type) {
330 case ARPHRD_ETHER:
331 case ARPHRD_IEEE802:
332 case ARPHRD_FDDI:
333 ipv6_eth_mc_map(addr, buf);
334 return 0;
335 case ARPHRD_IEEE802_TR:
336 ipv6_tr_mc_map(addr,buf);
337 return 0;
338 case ARPHRD_ARCNET:
339 ipv6_arcnet_mc_map(addr, buf);
340 return 0;
341 case ARPHRD_INFINIBAND:
342 ipv6_ib_mc_map(addr, dev->broadcast, buf);
343 return 0;
344 case ARPHRD_IPGRE:
345 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
346 default:
347 if (dir) {
348 memcpy(buf, dev->broadcast, dev->addr_len);
349 return 0;
350 }
351 }
352 return -EINVAL;
353}
354
355EXPORT_SYMBOL(ndisc_mc_map);
356
357static u32 ndisc_hash(const void *pkey,
358 const struct net_device *dev,
359 __u32 hash_rnd)
360{
361 const u32 *p32 = pkey;
362 u32 addr_hash, i;
363
364 addr_hash = 0;
365 for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
366 addr_hash ^= *p32++;
367
368 return jhash_2words(addr_hash, dev->ifindex, hash_rnd);
369}
370
371static int ndisc_constructor(struct neighbour *neigh)
372{
373 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
374 struct net_device *dev = neigh->dev;
375 struct inet6_dev *in6_dev;
376 struct neigh_parms *parms;
377 int is_multicast = ipv6_addr_is_multicast(addr);
378
379 rcu_read_lock();
380 in6_dev = in6_dev_get(dev);
381 if (in6_dev == NULL) {
382 rcu_read_unlock();
383 return -EINVAL;
384 }
385
386 parms = in6_dev->nd_parms;
387 __neigh_parms_put(neigh->parms);
388 neigh->parms = neigh_parms_clone(parms);
389 rcu_read_unlock();
390
391 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
392 if (!dev->header_ops) {
393 neigh->nud_state = NUD_NOARP;
394 neigh->ops = &ndisc_direct_ops;
395 neigh->output = neigh->ops->queue_xmit;
396 } else {
397 if (is_multicast) {
398 neigh->nud_state = NUD_NOARP;
399 ndisc_mc_map(addr, neigh->ha, dev, 1);
400 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
401 neigh->nud_state = NUD_NOARP;
402 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
403 if (dev->flags&IFF_LOOPBACK)
404 neigh->type = RTN_LOCAL;
405 } else if (dev->flags&IFF_POINTOPOINT) {
406 neigh->nud_state = NUD_NOARP;
407 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
408 }
409 if (dev->header_ops->cache)
410 neigh->ops = &ndisc_hh_ops;
411 else
412 neigh->ops = &ndisc_generic_ops;
413 if (neigh->nud_state&NUD_VALID)
414 neigh->output = neigh->ops->connected_output;
415 else
416 neigh->output = neigh->ops->output;
417 }
418 in6_dev_put(in6_dev);
419 return 0;
420}
421
422static int pndisc_constructor(struct pneigh_entry *n)
423{
424 struct in6_addr *addr = (struct in6_addr*)&n->key;
425 struct in6_addr maddr;
426 struct net_device *dev = n->dev;
427
428 if (dev == NULL || __in6_dev_get(dev) == NULL)
429 return -EINVAL;
430 addrconf_addr_solict_mult(addr, &maddr);
431 ipv6_dev_mc_inc(dev, &maddr);
432 return 0;
433}
434
435static void pndisc_destructor(struct pneigh_entry *n)
436{
437 struct in6_addr *addr = (struct in6_addr*)&n->key;
438 struct in6_addr maddr;
439 struct net_device *dev = n->dev;
440
441 if (dev == NULL || __in6_dev_get(dev) == NULL)
442 return;
443 addrconf_addr_solict_mult(addr, &maddr);
444 ipv6_dev_mc_dec(dev, &maddr);
445}
446
447struct sk_buff *ndisc_build_skb(struct net_device *dev,
448 const struct in6_addr *daddr,
449 const struct in6_addr *saddr,
450 struct icmp6hdr *icmp6h,
451 const struct in6_addr *target,
452 int llinfo)
453{
454 struct net *net = dev_net(dev);
455 struct sock *sk = net->ipv6.ndisc_sk;
456 struct sk_buff *skb;
457 struct icmp6hdr *hdr;
458 int len;
459 int err;
460 u8 *opt;
461
462 if (!dev->addr_len)
463 llinfo = 0;
464
465 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
466 if (llinfo)
467 len += ndisc_opt_addr_space(dev);
468
469 skb = sock_alloc_send_skb(sk,
470 (MAX_HEADER + sizeof(struct ipv6hdr) +
471 len + LL_ALLOCATED_SPACE(dev)),
472 1, &err);
473 if (!skb) {
474 ND_PRINTK0(KERN_ERR
475 "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n",
476 __func__, err);
477 return NULL;
478 }
479
480 skb_reserve(skb, LL_RESERVED_SPACE(dev));
481 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
482
483 skb->transport_header = skb->tail;
484 skb_put(skb, len);
485
486 hdr = (struct icmp6hdr *)skb_transport_header(skb);
487 memcpy(hdr, icmp6h, sizeof(*hdr));
488
489 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
490 if (target) {
491 ipv6_addr_copy((struct in6_addr *)opt, target);
492 opt += sizeof(*target);
493 }
494
495 if (llinfo)
496 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
497 dev->addr_len, dev->type);
498
499 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
500 IPPROTO_ICMPV6,
501 csum_partial(hdr,
502 len, 0));
503
504 return skb;
505}
506
507EXPORT_SYMBOL(ndisc_build_skb);
508
509void ndisc_send_skb(struct sk_buff *skb,
510 struct net_device *dev,
511 struct neighbour *neigh,
512 const struct in6_addr *daddr,
513 const struct in6_addr *saddr,
514 struct icmp6hdr *icmp6h)
515{
516 struct flowi6 fl6;
517 struct dst_entry *dst;
518 struct net *net = dev_net(dev);
519 struct sock *sk = net->ipv6.ndisc_sk;
520 struct inet6_dev *idev;
521 int err;
522 u8 type;
523
524 type = icmp6h->icmp6_type;
525
526 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex);
527
528 dst = icmp6_dst_alloc(dev, neigh, daddr);
529 if (!dst) {
530 kfree_skb(skb);
531 return;
532 }
533
534 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
535 if (IS_ERR(dst)) {
536 kfree_skb(skb);
537 return;
538 }
539
540 skb_dst_set(skb, dst);
541
542 idev = in6_dev_get(dst->dev);
543 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
544
545 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
546 dst_output);
547 if (!err) {
548 ICMP6MSGOUT_INC_STATS(net, idev, type);
549 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
550 }
551
552 if (likely(idev != NULL))
553 in6_dev_put(idev);
554}
555
556EXPORT_SYMBOL(ndisc_send_skb);
557
558
559
560
561static void __ndisc_send(struct net_device *dev,
562 struct neighbour *neigh,
563 const struct in6_addr *daddr,
564 const struct in6_addr *saddr,
565 struct icmp6hdr *icmp6h, const struct in6_addr *target,
566 int llinfo)
567{
568 struct sk_buff *skb;
569
570 skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
571 if (!skb)
572 return;
573
574 ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
575}
576
577static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
578 const struct in6_addr *daddr,
579 const struct in6_addr *solicited_addr,
580 int router, int solicited, int override, int inc_opt)
581{
582 struct in6_addr tmpaddr;
583 struct inet6_ifaddr *ifp;
584 const struct in6_addr *src_addr;
585 struct icmp6hdr icmp6h = {
586 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
587 };
588
589
590 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
591 if (ifp) {
592 src_addr = solicited_addr;
593 if (ifp->flags & IFA_F_OPTIMISTIC)
594 override = 0;
595 inc_opt |= ifp->idev->cnf.force_tllao;
596 in6_ifa_put(ifp);
597 } else {
598 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
599 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
600 &tmpaddr))
601 return;
602 src_addr = &tmpaddr;
603 }
604
605 icmp6h.icmp6_router = router;
606 icmp6h.icmp6_solicited = solicited;
607 icmp6h.icmp6_override = override;
608
609 __ndisc_send(dev, neigh, daddr, src_addr,
610 &icmp6h, solicited_addr,
611 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
612}
613
614void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
615 const struct in6_addr *solicit,
616 const struct in6_addr *daddr, const struct in6_addr *saddr)
617{
618 struct in6_addr addr_buf;
619 struct icmp6hdr icmp6h = {
620 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
621 };
622
623 if (saddr == NULL) {
624 if (ipv6_get_lladdr(dev, &addr_buf,
625 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
626 return;
627 saddr = &addr_buf;
628 }
629
630 __ndisc_send(dev, neigh, daddr, saddr,
631 &icmp6h, solicit,
632 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
633}
634
635void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
636 const struct in6_addr *daddr)
637{
638 struct icmp6hdr icmp6h = {
639 .icmp6_type = NDISC_ROUTER_SOLICITATION,
640 };
641 int send_sllao = dev->addr_len;
642
643#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
644
645
646
647
648
649
650
651
652 if (send_sllao) {
653 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
654 dev, 1);
655 if (ifp) {
656 if (ifp->flags & IFA_F_OPTIMISTIC) {
657 send_sllao = 0;
658 }
659 in6_ifa_put(ifp);
660 } else {
661 send_sllao = 0;
662 }
663 }
664#endif
665 __ndisc_send(dev, NULL, daddr, saddr,
666 &icmp6h, NULL,
667 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
668}
669
670
671static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
672{
673
674
675
676
677 dst_link_failure(skb);
678 kfree_skb(skb);
679}
680
681
682
683static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
684{
685 struct in6_addr *saddr = NULL;
686 struct in6_addr mcaddr;
687 struct net_device *dev = neigh->dev;
688 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
689 int probes = atomic_read(&neigh->probes);
690
691 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
692 saddr = &ipv6_hdr(skb)->saddr;
693
694 if ((probes -= neigh->parms->ucast_probes) < 0) {
695 if (!(neigh->nud_state & NUD_VALID)) {
696 ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n",
697 __func__, target);
698 }
699 ndisc_send_ns(dev, neigh, target, target, saddr);
700 } else if ((probes -= neigh->parms->app_probes) < 0) {
701#ifdef CONFIG_ARPD
702 neigh_app_ns(neigh);
703#endif
704 } else {
705 addrconf_addr_solict_mult(target, &mcaddr);
706 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
707 }
708}
709
710static int pndisc_is_router(const void *pkey,
711 struct net_device *dev)
712{
713 struct pneigh_entry *n;
714 int ret = -1;
715
716 read_lock_bh(&nd_tbl.lock);
717 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
718 if (n)
719 ret = !!(n->flags & NTF_ROUTER);
720 read_unlock_bh(&nd_tbl.lock);
721
722 return ret;
723}
724
725static void ndisc_recv_ns(struct sk_buff *skb)
726{
727 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
728 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
729 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
730 u8 *lladdr = NULL;
731 u32 ndoptlen = skb->tail - (skb->transport_header +
732 offsetof(struct nd_msg, opt));
733 struct ndisc_options ndopts;
734 struct net_device *dev = skb->dev;
735 struct inet6_ifaddr *ifp;
736 struct inet6_dev *idev = NULL;
737 struct neighbour *neigh;
738 int dad = ipv6_addr_any(saddr);
739 int inc;
740 int is_router = -1;
741
742 if (ipv6_addr_is_multicast(&msg->target)) {
743 ND_PRINTK2(KERN_WARNING
744 "ICMPv6 NS: multicast target address");
745 return;
746 }
747
748
749
750
751
752 if (dad &&
753 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
754 daddr->s6_addr32[1] == htonl(0x00000000) &&
755 daddr->s6_addr32[2] == htonl(0x00000001) &&
756 daddr->s6_addr [12] == 0xff )) {
757 ND_PRINTK2(KERN_WARNING
758 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
759 return;
760 }
761
762 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
763 ND_PRINTK2(KERN_WARNING
764 "ICMPv6 NS: invalid ND options\n");
765 return;
766 }
767
768 if (ndopts.nd_opts_src_lladdr) {
769 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
770 if (!lladdr) {
771 ND_PRINTK2(KERN_WARNING
772 "ICMPv6 NS: invalid link-layer address length\n");
773 return;
774 }
775
776
777
778
779
780
781 if (dad) {
782 ND_PRINTK2(KERN_WARNING
783 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
784 return;
785 }
786 }
787
788 inc = ipv6_addr_is_multicast(daddr);
789
790 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
791 if (ifp) {
792
793 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
794 if (dad) {
795 if (dev->type == ARPHRD_IEEE802_TR) {
796 const unsigned char *sadr;
797 sadr = skb_mac_header(skb);
798 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
799 sadr[9] == dev->dev_addr[1] &&
800 sadr[10] == dev->dev_addr[2] &&
801 sadr[11] == dev->dev_addr[3] &&
802 sadr[12] == dev->dev_addr[4] &&
803 sadr[13] == dev->dev_addr[5]) {
804
805 goto out;
806 }
807 }
808
809
810
811
812
813
814 addrconf_dad_failure(ifp);
815 return;
816 } else {
817
818
819
820
821
822
823 if (!(ifp->flags & IFA_F_OPTIMISTIC))
824 goto out;
825 }
826 }
827
828 idev = ifp->idev;
829 } else {
830 struct net *net = dev_net(dev);
831
832 idev = in6_dev_get(dev);
833 if (!idev) {
834
835 return;
836 }
837
838 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
839 (idev->cnf.forwarding &&
840 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
841 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
842 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
843 skb->pkt_type != PACKET_HOST &&
844 inc != 0 &&
845 idev->nd_parms->proxy_delay != 0) {
846
847
848
849
850
851
852
853 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
854 if (n)
855 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
856 goto out;
857 }
858 } else
859 goto out;
860 }
861
862 if (is_router < 0)
863 is_router = !!idev->cnf.forwarding;
864
865 if (dad) {
866 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
867 is_router, 0, (ifp != NULL), 1);
868 goto out;
869 }
870
871 if (inc)
872 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
873 else
874 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
875
876
877
878
879
880 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
881 !inc || lladdr || !dev->addr_len);
882 if (neigh)
883 neigh_update(neigh, lladdr, NUD_STALE,
884 NEIGH_UPDATE_F_WEAK_OVERRIDE|
885 NEIGH_UPDATE_F_OVERRIDE);
886 if (neigh || !dev->header_ops) {
887 ndisc_send_na(dev, neigh, saddr, &msg->target,
888 is_router,
889 1, (ifp != NULL && inc), inc);
890 if (neigh)
891 neigh_release(neigh);
892 }
893
894out:
895 if (ifp)
896 in6_ifa_put(ifp);
897 else
898 in6_dev_put(idev);
899}
900
901static void ndisc_recv_na(struct sk_buff *skb)
902{
903 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
904 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
905 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
906 u8 *lladdr = NULL;
907 u32 ndoptlen = skb->tail - (skb->transport_header +
908 offsetof(struct nd_msg, opt));
909 struct ndisc_options ndopts;
910 struct net_device *dev = skb->dev;
911 struct inet6_ifaddr *ifp;
912 struct neighbour *neigh;
913
914 if (skb->len < sizeof(struct nd_msg)) {
915 ND_PRINTK2(KERN_WARNING
916 "ICMPv6 NA: packet too short\n");
917 return;
918 }
919
920 if (ipv6_addr_is_multicast(&msg->target)) {
921 ND_PRINTK2(KERN_WARNING
922 "ICMPv6 NA: target address is multicast.\n");
923 return;
924 }
925
926 if (ipv6_addr_is_multicast(daddr) &&
927 msg->icmph.icmp6_solicited) {
928 ND_PRINTK2(KERN_WARNING
929 "ICMPv6 NA: solicited NA is multicasted.\n");
930 return;
931 }
932
933 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
934 ND_PRINTK2(KERN_WARNING
935 "ICMPv6 NS: invalid ND option\n");
936 return;
937 }
938 if (ndopts.nd_opts_tgt_lladdr) {
939 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
940 if (!lladdr) {
941 ND_PRINTK2(KERN_WARNING
942 "ICMPv6 NA: invalid link-layer address length\n");
943 return;
944 }
945 }
946 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
947 if (ifp) {
948 if (ifp->flags & IFA_F_TENTATIVE) {
949 addrconf_dad_failure(ifp);
950 return;
951 }
952
953
954
955
956
957
958
959
960
961 if (skb->pkt_type != PACKET_LOOPBACK)
962 ND_PRINTK1(KERN_WARNING
963 "ICMPv6 NA: someone advertises our address %pI6 on %s!\n",
964 &ifp->addr, ifp->idev->dev->name);
965 in6_ifa_put(ifp);
966 return;
967 }
968 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
969
970 if (neigh) {
971 u8 old_flags = neigh->flags;
972 struct net *net = dev_net(dev);
973
974 if (neigh->nud_state & NUD_FAILED)
975 goto out;
976
977
978
979
980
981
982 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
983 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
984 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
985
986 goto out;
987 }
988
989 neigh_update(neigh, lladdr,
990 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
991 NEIGH_UPDATE_F_WEAK_OVERRIDE|
992 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
993 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
994 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
995
996 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
997
998
999
1000 struct rt6_info *rt;
1001 rt = rt6_get_dflt_router(saddr, dev);
1002 if (rt)
1003 ip6_del_rt(rt);
1004 }
1005
1006out:
1007 neigh_release(neigh);
1008 }
1009}
1010
1011static void ndisc_recv_rs(struct sk_buff *skb)
1012{
1013 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1014 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1015 struct neighbour *neigh;
1016 struct inet6_dev *idev;
1017 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1018 struct ndisc_options ndopts;
1019 u8 *lladdr = NULL;
1020
1021 if (skb->len < sizeof(*rs_msg))
1022 return;
1023
1024 idev = in6_dev_get(skb->dev);
1025 if (!idev) {
1026 if (net_ratelimit())
1027 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1028 return;
1029 }
1030
1031
1032 if (!idev->cnf.forwarding)
1033 goto out;
1034
1035
1036
1037
1038
1039 if (ipv6_addr_any(saddr))
1040 goto out;
1041
1042
1043 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1044 if (net_ratelimit())
1045 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1046 goto out;
1047 }
1048
1049 if (ndopts.nd_opts_src_lladdr) {
1050 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1051 skb->dev);
1052 if (!lladdr)
1053 goto out;
1054 }
1055
1056 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1057 if (neigh) {
1058 neigh_update(neigh, lladdr, NUD_STALE,
1059 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1060 NEIGH_UPDATE_F_OVERRIDE|
1061 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1062 neigh_release(neigh);
1063 }
1064out:
1065 in6_dev_put(idev);
1066}
1067
1068static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1069{
1070 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1071 struct sk_buff *skb;
1072 struct nlmsghdr *nlh;
1073 struct nduseroptmsg *ndmsg;
1074 struct net *net = dev_net(ra->dev);
1075 int err;
1076 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1077 + (opt->nd_opt_len << 3));
1078 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1079
1080 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1081 if (skb == NULL) {
1082 err = -ENOBUFS;
1083 goto errout;
1084 }
1085
1086 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1087 if (nlh == NULL) {
1088 goto nla_put_failure;
1089 }
1090
1091 ndmsg = nlmsg_data(nlh);
1092 ndmsg->nduseropt_family = AF_INET6;
1093 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1094 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1095 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1096 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1097
1098 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1099
1100 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1101 &ipv6_hdr(ra)->saddr);
1102 nlmsg_end(skb, nlh);
1103
1104 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
1105 return;
1106
1107nla_put_failure:
1108 nlmsg_free(skb);
1109 err = -EMSGSIZE;
1110errout:
1111 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1112}
1113
1114static inline int accept_ra(struct inet6_dev *in6_dev)
1115{
1116
1117
1118
1119
1120 if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
1121 return 0;
1122
1123 return in6_dev->cnf.accept_ra;
1124}
1125
1126static void ndisc_router_discovery(struct sk_buff *skb)
1127{
1128 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1129 struct neighbour *neigh = NULL;
1130 struct inet6_dev *in6_dev;
1131 struct rt6_info *rt = NULL;
1132 int lifetime;
1133 struct ndisc_options ndopts;
1134 int optlen;
1135 unsigned int pref = 0;
1136
1137 __u8 * opt = (__u8 *)(ra_msg + 1);
1138
1139 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1140
1141 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1142 ND_PRINTK2(KERN_WARNING
1143 "ICMPv6 RA: source address is not link-local.\n");
1144 return;
1145 }
1146 if (optlen < 0) {
1147 ND_PRINTK2(KERN_WARNING
1148 "ICMPv6 RA: packet too short\n");
1149 return;
1150 }
1151
1152#ifdef CONFIG_IPV6_NDISC_NODETYPE
1153 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1154 ND_PRINTK2(KERN_WARNING
1155 "ICMPv6 RA: from host or unauthorized router\n");
1156 return;
1157 }
1158#endif
1159
1160
1161
1162
1163
1164 in6_dev = in6_dev_get(skb->dev);
1165 if (in6_dev == NULL) {
1166 ND_PRINTK0(KERN_ERR
1167 "ICMPv6 RA: can't find inet6 device for %s.\n",
1168 skb->dev->name);
1169 return;
1170 }
1171
1172 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1173 in6_dev_put(in6_dev);
1174 ND_PRINTK2(KERN_WARNING
1175 "ICMP6 RA: invalid ND options\n");
1176 return;
1177 }
1178
1179 if (!accept_ra(in6_dev))
1180 goto skip_linkparms;
1181
1182#ifdef CONFIG_IPV6_NDISC_NODETYPE
1183
1184 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1185 goto skip_linkparms;
1186#endif
1187
1188 if (in6_dev->if_flags & IF_RS_SENT) {
1189
1190
1191
1192
1193 in6_dev->if_flags |= IF_RA_RCVD;
1194 }
1195
1196
1197
1198
1199
1200 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1201 IF_RA_OTHERCONF)) |
1202 (ra_msg->icmph.icmp6_addrconf_managed ?
1203 IF_RA_MANAGED : 0) |
1204 (ra_msg->icmph.icmp6_addrconf_other ?
1205 IF_RA_OTHERCONF : 0);
1206
1207 if (!in6_dev->cnf.accept_ra_defrtr)
1208 goto skip_defrtr;
1209
1210 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1211
1212#ifdef CONFIG_IPV6_ROUTER_PREF
1213 pref = ra_msg->icmph.icmp6_router_pref;
1214
1215 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1216 !in6_dev->cnf.accept_ra_rtr_pref)
1217 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1218#endif
1219
1220 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1221
1222 if (rt)
1223 neigh = rt->rt6i_nexthop;
1224
1225 if (rt && lifetime == 0) {
1226 neigh_clone(neigh);
1227 ip6_del_rt(rt);
1228 rt = NULL;
1229 }
1230
1231 if (rt == NULL && lifetime) {
1232 ND_PRINTK3(KERN_DEBUG
1233 "ICMPv6 RA: adding default router.\n");
1234
1235 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1236 if (rt == NULL) {
1237 ND_PRINTK0(KERN_ERR
1238 "ICMPv6 RA: %s() failed to add default route.\n",
1239 __func__);
1240 in6_dev_put(in6_dev);
1241 return;
1242 }
1243
1244 neigh = rt->rt6i_nexthop;
1245 if (neigh == NULL) {
1246 ND_PRINTK0(KERN_ERR
1247 "ICMPv6 RA: %s() got default router without neighbour.\n",
1248 __func__);
1249 dst_release(&rt->dst);
1250 in6_dev_put(in6_dev);
1251 return;
1252 }
1253 neigh->flags |= NTF_ROUTER;
1254 } else if (rt) {
1255 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1256 }
1257
1258 if (rt)
1259 rt->rt6i_expires = jiffies + (HZ * lifetime);
1260
1261 if (ra_msg->icmph.icmp6_hop_limit) {
1262 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1263 if (rt)
1264 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1265 ra_msg->icmph.icmp6_hop_limit);
1266 }
1267
1268skip_defrtr:
1269
1270
1271
1272
1273
1274 if (in6_dev->nd_parms) {
1275 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1276
1277 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1278 rtime = (rtime*HZ)/1000;
1279 if (rtime < HZ/10)
1280 rtime = HZ/10;
1281 in6_dev->nd_parms->retrans_time = rtime;
1282 in6_dev->tstamp = jiffies;
1283 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1284 }
1285
1286 rtime = ntohl(ra_msg->reachable_time);
1287 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1288 rtime = (rtime*HZ)/1000;
1289
1290 if (rtime < HZ/10)
1291 rtime = HZ/10;
1292
1293 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1294 in6_dev->nd_parms->base_reachable_time = rtime;
1295 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1296 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1297 in6_dev->tstamp = jiffies;
1298 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1299 }
1300 }
1301 }
1302
1303skip_linkparms:
1304
1305
1306
1307
1308
1309 if (!neigh)
1310 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1311 skb->dev, 1);
1312 if (neigh) {
1313 u8 *lladdr = NULL;
1314 if (ndopts.nd_opts_src_lladdr) {
1315 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1316 skb->dev);
1317 if (!lladdr) {
1318 ND_PRINTK2(KERN_WARNING
1319 "ICMPv6 RA: invalid link-layer address length\n");
1320 goto out;
1321 }
1322 }
1323 neigh_update(neigh, lladdr, NUD_STALE,
1324 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1325 NEIGH_UPDATE_F_OVERRIDE|
1326 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1327 NEIGH_UPDATE_F_ISROUTER);
1328 }
1329
1330 if (!accept_ra(in6_dev))
1331 goto out;
1332
1333#ifdef CONFIG_IPV6_ROUTE_INFO
1334 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1335 struct nd_opt_hdr *p;
1336 for (p = ndopts.nd_opts_ri;
1337 p;
1338 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1339 struct route_info *ri = (struct route_info *)p;
1340#ifdef CONFIG_IPV6_NDISC_NODETYPE
1341 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1342 ri->prefix_len == 0)
1343 continue;
1344#endif
1345 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1346 continue;
1347 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
1348 &ipv6_hdr(skb)->saddr);
1349 }
1350 }
1351#endif
1352
1353#ifdef CONFIG_IPV6_NDISC_NODETYPE
1354
1355 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1356 goto out;
1357#endif
1358
1359 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1360 struct nd_opt_hdr *p;
1361 for (p = ndopts.nd_opts_pi;
1362 p;
1363 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1364 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1365 }
1366 }
1367
1368 if (ndopts.nd_opts_mtu) {
1369 __be32 n;
1370 u32 mtu;
1371
1372 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1373 mtu = ntohl(n);
1374
1375 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1376 ND_PRINTK2(KERN_WARNING
1377 "ICMPv6 RA: invalid mtu: %d\n",
1378 mtu);
1379 } else if (in6_dev->cnf.mtu6 != mtu) {
1380 in6_dev->cnf.mtu6 = mtu;
1381
1382 if (rt)
1383 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
1384
1385 rt6_mtu_change(skb->dev, mtu);
1386 }
1387 }
1388
1389 if (ndopts.nd_useropts) {
1390 struct nd_opt_hdr *p;
1391 for (p = ndopts.nd_useropts;
1392 p;
1393 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1394 ndisc_ra_useropt(skb, p);
1395 }
1396 }
1397
1398 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1399 ND_PRINTK2(KERN_WARNING
1400 "ICMPv6 RA: invalid RA options");
1401 }
1402out:
1403 if (rt)
1404 dst_release(&rt->dst);
1405 else if (neigh)
1406 neigh_release(neigh);
1407 in6_dev_put(in6_dev);
1408}
1409
1410static void ndisc_redirect_rcv(struct sk_buff *skb)
1411{
1412 struct inet6_dev *in6_dev;
1413 struct icmp6hdr *icmph;
1414 struct in6_addr *dest;
1415 struct in6_addr *target;
1416 struct neighbour *neigh;
1417 int on_link = 0;
1418 struct ndisc_options ndopts;
1419 int optlen;
1420 u8 *lladdr = NULL;
1421
1422#ifdef CONFIG_IPV6_NDISC_NODETYPE
1423 switch (skb->ndisc_nodetype) {
1424 case NDISC_NODETYPE_HOST:
1425 case NDISC_NODETYPE_NODEFAULT:
1426 ND_PRINTK2(KERN_WARNING
1427 "ICMPv6 Redirect: from host or unauthorized router\n");
1428 return;
1429 }
1430#endif
1431
1432 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1433 ND_PRINTK2(KERN_WARNING
1434 "ICMPv6 Redirect: source address is not link-local.\n");
1435 return;
1436 }
1437
1438 optlen = skb->tail - skb->transport_header;
1439 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1440
1441 if (optlen < 0) {
1442 ND_PRINTK2(KERN_WARNING
1443 "ICMPv6 Redirect: packet too short\n");
1444 return;
1445 }
1446
1447 icmph = icmp6_hdr(skb);
1448 target = (struct in6_addr *) (icmph + 1);
1449 dest = target + 1;
1450
1451 if (ipv6_addr_is_multicast(dest)) {
1452 ND_PRINTK2(KERN_WARNING
1453 "ICMPv6 Redirect: destination address is multicast.\n");
1454 return;
1455 }
1456
1457 if (ipv6_addr_equal(dest, target)) {
1458 on_link = 1;
1459 } else if (ipv6_addr_type(target) !=
1460 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1461 ND_PRINTK2(KERN_WARNING
1462 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1463 return;
1464 }
1465
1466 in6_dev = in6_dev_get(skb->dev);
1467 if (!in6_dev)
1468 return;
1469 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1470 in6_dev_put(in6_dev);
1471 return;
1472 }
1473
1474
1475
1476
1477
1478
1479 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1480 ND_PRINTK2(KERN_WARNING
1481 "ICMPv6 Redirect: invalid ND options\n");
1482 in6_dev_put(in6_dev);
1483 return;
1484 }
1485 if (ndopts.nd_opts_tgt_lladdr) {
1486 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1487 skb->dev);
1488 if (!lladdr) {
1489 ND_PRINTK2(KERN_WARNING
1490 "ICMPv6 Redirect: invalid link-layer address length\n");
1491 in6_dev_put(in6_dev);
1492 return;
1493 }
1494 }
1495
1496 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1497 if (neigh) {
1498 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1499 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1500 on_link);
1501 neigh_release(neigh);
1502 }
1503 in6_dev_put(in6_dev);
1504}
1505
1506void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
1507 const struct in6_addr *target)
1508{
1509 struct net_device *dev = skb->dev;
1510 struct net *net = dev_net(dev);
1511 struct sock *sk = net->ipv6.ndisc_sk;
1512 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1513 struct sk_buff *buff;
1514 struct icmp6hdr *icmph;
1515 struct in6_addr saddr_buf;
1516 struct in6_addr *addrp;
1517 struct rt6_info *rt;
1518 struct dst_entry *dst;
1519 struct inet6_dev *idev;
1520 struct flowi6 fl6;
1521 u8 *opt;
1522 int rd_len;
1523 int err;
1524 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1525
1526 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1527 ND_PRINTK2(KERN_WARNING
1528 "ICMPv6 Redirect: no link-local address on %s\n",
1529 dev->name);
1530 return;
1531 }
1532
1533 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1534 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1535 ND_PRINTK2(KERN_WARNING
1536 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1537 return;
1538 }
1539
1540 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
1541 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1542
1543 dst = ip6_route_output(net, NULL, &fl6);
1544 if (dst == NULL)
1545 return;
1546
1547 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1548 if (IS_ERR(dst))
1549 return;
1550
1551 rt = (struct rt6_info *) dst;
1552
1553 if (rt->rt6i_flags & RTF_GATEWAY) {
1554 ND_PRINTK2(KERN_WARNING
1555 "ICMPv6 Redirect: destination is not a neighbour.\n");
1556 goto release;
1557 }
1558 if (!rt->rt6i_peer)
1559 rt6_bind_peer(rt, 1);
1560 if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ))
1561 goto release;
1562
1563 if (dev->addr_len) {
1564 read_lock_bh(&neigh->lock);
1565 if (neigh->nud_state & NUD_VALID) {
1566 memcpy(ha_buf, neigh->ha, dev->addr_len);
1567 read_unlock_bh(&neigh->lock);
1568 ha = ha_buf;
1569 len += ndisc_opt_addr_space(dev);
1570 } else
1571 read_unlock_bh(&neigh->lock);
1572 }
1573
1574 rd_len = min_t(unsigned int,
1575 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1576 rd_len &= ~0x7;
1577 len += rd_len;
1578
1579 buff = sock_alloc_send_skb(sk,
1580 (MAX_HEADER + sizeof(struct ipv6hdr) +
1581 len + LL_ALLOCATED_SPACE(dev)),
1582 1, &err);
1583 if (buff == NULL) {
1584 ND_PRINTK0(KERN_ERR
1585 "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n",
1586 __func__, err);
1587 goto release;
1588 }
1589
1590 skb_reserve(buff, LL_RESERVED_SPACE(dev));
1591 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1592 IPPROTO_ICMPV6, len);
1593
1594 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
1595 skb_put(buff, len);
1596 icmph = icmp6_hdr(buff);
1597
1598 memset(icmph, 0, sizeof(struct icmp6hdr));
1599 icmph->icmp6_type = NDISC_REDIRECT;
1600
1601
1602
1603
1604
1605 addrp = (struct in6_addr *)(icmph + 1);
1606 ipv6_addr_copy(addrp, target);
1607 addrp++;
1608 ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr);
1609
1610 opt = (u8*) (addrp + 1);
1611
1612
1613
1614
1615
1616 if (ha)
1617 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1618 dev->addr_len, dev->type);
1619
1620
1621
1622
1623
1624 memset(opt, 0, 8);
1625 *(opt++) = ND_OPT_REDIRECT_HDR;
1626 *(opt++) = (rd_len >> 3);
1627 opt += 6;
1628
1629 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1630
1631 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1632 len, IPPROTO_ICMPV6,
1633 csum_partial(icmph, len, 0));
1634
1635 skb_dst_set(buff, dst);
1636 idev = in6_dev_get(dst->dev);
1637 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1638 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1639 dst_output);
1640 if (!err) {
1641 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
1642 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1643 }
1644
1645 if (likely(idev != NULL))
1646 in6_dev_put(idev);
1647 return;
1648
1649release:
1650 dst_release(dst);
1651}
1652
1653static void pndisc_redo(struct sk_buff *skb)
1654{
1655 ndisc_recv_ns(skb);
1656 kfree_skb(skb);
1657}
1658
1659int ndisc_rcv(struct sk_buff *skb)
1660{
1661 struct nd_msg *msg;
1662
1663 if (!pskb_may_pull(skb, skb->len))
1664 return 0;
1665
1666 msg = (struct nd_msg *)skb_transport_header(skb);
1667
1668 __skb_push(skb, skb->data - skb_transport_header(skb));
1669
1670 if (ipv6_hdr(skb)->hop_limit != 255) {
1671 ND_PRINTK2(KERN_WARNING
1672 "ICMPv6 NDISC: invalid hop-limit: %d\n",
1673 ipv6_hdr(skb)->hop_limit);
1674 return 0;
1675 }
1676
1677 if (msg->icmph.icmp6_code != 0) {
1678 ND_PRINTK2(KERN_WARNING
1679 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1680 msg->icmph.icmp6_code);
1681 return 0;
1682 }
1683
1684 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1685
1686 switch (msg->icmph.icmp6_type) {
1687 case NDISC_NEIGHBOUR_SOLICITATION:
1688 ndisc_recv_ns(skb);
1689 break;
1690
1691 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1692 ndisc_recv_na(skb);
1693 break;
1694
1695 case NDISC_ROUTER_SOLICITATION:
1696 ndisc_recv_rs(skb);
1697 break;
1698
1699 case NDISC_ROUTER_ADVERTISEMENT:
1700 ndisc_router_discovery(skb);
1701 break;
1702
1703 case NDISC_REDIRECT:
1704 ndisc_redirect_rcv(skb);
1705 break;
1706 }
1707
1708 return 0;
1709}
1710
1711static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1712{
1713 struct net_device *dev = ptr;
1714 struct net *net = dev_net(dev);
1715
1716 switch (event) {
1717 case NETDEV_CHANGEADDR:
1718 neigh_changeaddr(&nd_tbl, dev);
1719 fib6_run_gc(~0UL, net);
1720 break;
1721 case NETDEV_DOWN:
1722 neigh_ifdown(&nd_tbl, dev);
1723 fib6_run_gc(~0UL, net);
1724 break;
1725 default:
1726 break;
1727 }
1728
1729 return NOTIFY_DONE;
1730}
1731
1732static struct notifier_block ndisc_netdev_notifier = {
1733 .notifier_call = ndisc_netdev_event,
1734};
1735
1736#ifdef CONFIG_SYSCTL
1737static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1738 const char *func, const char *dev_name)
1739{
1740 static char warncomm[TASK_COMM_LEN];
1741 static int warned;
1742 if (strcmp(warncomm, current->comm) && warned < 5) {
1743 strcpy(warncomm, current->comm);
1744 printk(KERN_WARNING
1745 "process `%s' is using deprecated sysctl (%s) "
1746 "net.ipv6.neigh.%s.%s; "
1747 "Use net.ipv6.neigh.%s.%s_ms "
1748 "instead.\n",
1749 warncomm, func,
1750 dev_name, ctl->procname,
1751 dev_name, ctl->procname);
1752 warned++;
1753 }
1754}
1755
1756int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
1757{
1758 struct net_device *dev = ctl->extra1;
1759 struct inet6_dev *idev;
1760 int ret;
1761
1762 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1763 (strcmp(ctl->procname, "base_reachable_time") == 0))
1764 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1765
1766 if (strcmp(ctl->procname, "retrans_time") == 0)
1767 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1768
1769 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1770 ret = proc_dointvec_jiffies(ctl, write,
1771 buffer, lenp, ppos);
1772
1773 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1774 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1775 ret = proc_dointvec_ms_jiffies(ctl, write,
1776 buffer, lenp, ppos);
1777 else
1778 ret = -1;
1779
1780 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1781 if (ctl->data == &idev->nd_parms->base_reachable_time)
1782 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1783 idev->tstamp = jiffies;
1784 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1785 in6_dev_put(idev);
1786 }
1787 return ret;
1788}
1789
1790
1791#endif
1792
1793static int __net_init ndisc_net_init(struct net *net)
1794{
1795 struct ipv6_pinfo *np;
1796 struct sock *sk;
1797 int err;
1798
1799 err = inet_ctl_sock_create(&sk, PF_INET6,
1800 SOCK_RAW, IPPROTO_ICMPV6, net);
1801 if (err < 0) {
1802 ND_PRINTK0(KERN_ERR
1803 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1804 err);
1805 return err;
1806 }
1807
1808 net->ipv6.ndisc_sk = sk;
1809
1810 np = inet6_sk(sk);
1811 np->hop_limit = 255;
1812
1813 np->mc_loop = 0;
1814
1815 return 0;
1816}
1817
1818static void __net_exit ndisc_net_exit(struct net *net)
1819{
1820 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1821}
1822
1823static struct pernet_operations ndisc_net_ops = {
1824 .init = ndisc_net_init,
1825 .exit = ndisc_net_exit,
1826};
1827
1828int __init ndisc_init(void)
1829{
1830 int err;
1831
1832 err = register_pernet_subsys(&ndisc_net_ops);
1833 if (err)
1834 return err;
1835
1836
1837
1838 neigh_table_init(&nd_tbl);
1839
1840#ifdef CONFIG_SYSCTL
1841 err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6",
1842 &ndisc_ifinfo_sysctl_change);
1843 if (err)
1844 goto out_unregister_pernet;
1845#endif
1846 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1847 if (err)
1848 goto out_unregister_sysctl;
1849out:
1850 return err;
1851
1852out_unregister_sysctl:
1853#ifdef CONFIG_SYSCTL
1854 neigh_sysctl_unregister(&nd_tbl.parms);
1855out_unregister_pernet:
1856#endif
1857 unregister_pernet_subsys(&ndisc_net_ops);
1858 goto out;
1859}
1860
1861void ndisc_cleanup(void)
1862{
1863 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1864#ifdef CONFIG_SYSCTL
1865 neigh_sysctl_unregister(&nd_tbl.parms);
1866#endif
1867 neigh_table_clear(&nd_tbl);
1868 unregister_pernet_subsys(&ndisc_net_ops);
1869}
1870
