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26#define pr_fmt(fmt) "ICMPv6: " fmt
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/socket.h>
32#include <linux/sockios.h>
33#include <linux/sched.h>
34#include <linux/net.h>
35#include <linux/in6.h>
36#include <linux/route.h>
37#include <linux/init.h>
38#include <linux/rcupdate.h>
39#include <linux/slab.h>
40#ifdef CONFIG_SYSCTL
41#include <linux/sysctl.h>
42#endif
43
44#include <linux/if_addr.h>
45#include <linux/if_ether.h>
46#include <linux/if_arp.h>
47#include <linux/ipv6.h>
48#include <linux/icmpv6.h>
49#include <linux/jhash.h>
50
51#include <net/sock.h>
52#include <net/snmp.h>
53
54#include <net/ipv6.h>
55#include <net/protocol.h>
56#include <net/ndisc.h>
57#include <net/ip6_route.h>
58#include <net/addrconf.h>
59#include <net/icmp.h>
60
61#include <net/netlink.h>
62#include <linux/rtnetlink.h>
63
64#include <net/flow.h>
65#include <net/ip6_checksum.h>
66#include <net/inet_common.h>
67#include <linux/proc_fs.h>
68
69#include <linux/netfilter.h>
70#include <linux/netfilter_ipv6.h>
71
72static u32 ndisc_hash(const void *pkey,
73 const struct net_device *dev,
74 __u32 *hash_rnd);
75static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
76static bool ndisc_allow_add(const struct net_device *dev,
77 struct netlink_ext_ack *extack);
78static int ndisc_constructor(struct neighbour *neigh);
79static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
80static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
81static int pndisc_constructor(struct pneigh_entry *n);
82static void pndisc_destructor(struct pneigh_entry *n);
83static void pndisc_redo(struct sk_buff *skb);
84
85static const struct neigh_ops ndisc_generic_ops = {
86 .family = AF_INET6,
87 .solicit = ndisc_solicit,
88 .error_report = ndisc_error_report,
89 .output = neigh_resolve_output,
90 .connected_output = neigh_connected_output,
91};
92
93static const struct neigh_ops ndisc_hh_ops = {
94 .family = AF_INET6,
95 .solicit = ndisc_solicit,
96 .error_report = ndisc_error_report,
97 .output = neigh_resolve_output,
98 .connected_output = neigh_resolve_output,
99};
100
101
102static const struct neigh_ops ndisc_direct_ops = {
103 .family = AF_INET6,
104 .output = neigh_direct_output,
105 .connected_output = neigh_direct_output,
106};
107
108struct neigh_table nd_tbl = {
109 .family = AF_INET6,
110 .key_len = sizeof(struct in6_addr),
111 .protocol = cpu_to_be16(ETH_P_IPV6),
112 .hash = ndisc_hash,
113 .key_eq = ndisc_key_eq,
114 .constructor = ndisc_constructor,
115 .pconstructor = pndisc_constructor,
116 .pdestructor = pndisc_destructor,
117 .proxy_redo = pndisc_redo,
118 .allow_add = ndisc_allow_add,
119 .id = "ndisc_cache",
120 .parms = {
121 .tbl = &nd_tbl,
122 .reachable_time = ND_REACHABLE_TIME,
123 .data = {
124 [NEIGH_VAR_MCAST_PROBES] = 3,
125 [NEIGH_VAR_UCAST_PROBES] = 3,
126 [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
127 [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
128 [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
129 [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
130 [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
131 [NEIGH_VAR_PROXY_QLEN] = 64,
132 [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
133 [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
134 },
135 },
136 .gc_interval = 30 * HZ,
137 .gc_thresh1 = 128,
138 .gc_thresh2 = 512,
139 .gc_thresh3 = 1024,
140};
141EXPORT_SYMBOL_GPL(nd_tbl);
142
143void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
144 int data_len, int pad)
145{
146 int space = __ndisc_opt_addr_space(data_len, pad);
147 u8 *opt = skb_put(skb, space);
148
149 opt[0] = type;
150 opt[1] = space>>3;
151
152 memset(opt + 2, 0, pad);
153 opt += pad;
154 space -= pad;
155
156 memcpy(opt+2, data, data_len);
157 data_len += 2;
158 opt += data_len;
159 space -= data_len;
160 if (space > 0)
161 memset(opt, 0, space);
162}
163EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
164
165static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
166 void *data, u8 icmp6_type)
167{
168 __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
169 ndisc_addr_option_pad(skb->dev->type));
170 ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type);
171}
172
173static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb,
174 void *ha,
175 const u8 *ops_data)
176{
177 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT);
178 ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data);
179}
180
181static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
182 struct nd_opt_hdr *end)
183{
184 int type;
185 if (!cur || !end || cur >= end)
186 return NULL;
187 type = cur->nd_opt_type;
188 do {
189 cur = ((void *)cur) + (cur->nd_opt_len << 3);
190 } while (cur < end && cur->nd_opt_type != type);
191 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
192}
193
194static inline int ndisc_is_useropt(const struct net_device *dev,
195 struct nd_opt_hdr *opt)
196{
197 return opt->nd_opt_type == ND_OPT_RDNSS ||
198 opt->nd_opt_type == ND_OPT_DNSSL ||
199 ndisc_ops_is_useropt(dev, opt->nd_opt_type);
200}
201
202static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
203 struct nd_opt_hdr *cur,
204 struct nd_opt_hdr *end)
205{
206 if (!cur || !end || cur >= end)
207 return NULL;
208 do {
209 cur = ((void *)cur) + (cur->nd_opt_len << 3);
210 } while (cur < end && !ndisc_is_useropt(dev, cur));
211 return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
212}
213
214struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
215 u8 *opt, int opt_len,
216 struct ndisc_options *ndopts)
217{
218 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
219
220 if (!nd_opt || opt_len < 0 || !ndopts)
221 return NULL;
222 memset(ndopts, 0, sizeof(*ndopts));
223 while (opt_len) {
224 int l;
225 if (opt_len < sizeof(struct nd_opt_hdr))
226 return NULL;
227 l = nd_opt->nd_opt_len << 3;
228 if (opt_len < l || l == 0)
229 return NULL;
230 if (ndisc_ops_parse_options(dev, nd_opt, ndopts))
231 goto next_opt;
232 switch (nd_opt->nd_opt_type) {
233 case ND_OPT_SOURCE_LL_ADDR:
234 case ND_OPT_TARGET_LL_ADDR:
235 case ND_OPT_MTU:
236 case ND_OPT_NONCE:
237 case ND_OPT_REDIRECT_HDR:
238 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
239 ND_PRINTK(2, warn,
240 "%s: duplicated ND6 option found: type=%d\n",
241 __func__, nd_opt->nd_opt_type);
242 } else {
243 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
244 }
245 break;
246 case ND_OPT_PREFIX_INFO:
247 ndopts->nd_opts_pi_end = nd_opt;
248 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
249 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
250 break;
251#ifdef CONFIG_IPV6_ROUTE_INFO
252 case ND_OPT_ROUTE_INFO:
253 ndopts->nd_opts_ri_end = nd_opt;
254 if (!ndopts->nd_opts_ri)
255 ndopts->nd_opts_ri = nd_opt;
256 break;
257#endif
258 default:
259 if (ndisc_is_useropt(dev, nd_opt)) {
260 ndopts->nd_useropts_end = nd_opt;
261 if (!ndopts->nd_useropts)
262 ndopts->nd_useropts = nd_opt;
263 } else {
264
265
266
267
268
269 ND_PRINTK(2, notice,
270 "%s: ignored unsupported option; type=%d, len=%d\n",
271 __func__,
272 nd_opt->nd_opt_type,
273 nd_opt->nd_opt_len);
274 }
275 }
276next_opt:
277 opt_len -= l;
278 nd_opt = ((void *)nd_opt) + l;
279 }
280 return ndopts;
281}
282
283int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
284{
285 switch (dev->type) {
286 case ARPHRD_ETHER:
287 case ARPHRD_IEEE802:
288 case ARPHRD_FDDI:
289 ipv6_eth_mc_map(addr, buf);
290 return 0;
291 case ARPHRD_ARCNET:
292 ipv6_arcnet_mc_map(addr, buf);
293 return 0;
294 case ARPHRD_INFINIBAND:
295 ipv6_ib_mc_map(addr, dev->broadcast, buf);
296 return 0;
297 case ARPHRD_IPGRE:
298 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
299 default:
300 if (dir) {
301 memcpy(buf, dev->broadcast, dev->addr_len);
302 return 0;
303 }
304 }
305 return -EINVAL;
306}
307EXPORT_SYMBOL(ndisc_mc_map);
308
309static u32 ndisc_hash(const void *pkey,
310 const struct net_device *dev,
311 __u32 *hash_rnd)
312{
313 return ndisc_hashfn(pkey, dev, hash_rnd);
314}
315
316static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
317{
318 return neigh_key_eq128(n, pkey);
319}
320
321static int ndisc_constructor(struct neighbour *neigh)
322{
323 struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
324 struct net_device *dev = neigh->dev;
325 struct inet6_dev *in6_dev;
326 struct neigh_parms *parms;
327 bool is_multicast = ipv6_addr_is_multicast(addr);
328
329 in6_dev = in6_dev_get(dev);
330 if (!in6_dev) {
331 return -EINVAL;
332 }
333
334 parms = in6_dev->nd_parms;
335 __neigh_parms_put(neigh->parms);
336 neigh->parms = neigh_parms_clone(parms);
337
338 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
339 if (!dev->header_ops) {
340 neigh->nud_state = NUD_NOARP;
341 neigh->ops = &ndisc_direct_ops;
342 neigh->output = neigh_direct_output;
343 } else {
344 if (is_multicast) {
345 neigh->nud_state = NUD_NOARP;
346 ndisc_mc_map(addr, neigh->ha, dev, 1);
347 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
348 neigh->nud_state = NUD_NOARP;
349 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
350 if (dev->flags&IFF_LOOPBACK)
351 neigh->type = RTN_LOCAL;
352 } else if (dev->flags&IFF_POINTOPOINT) {
353 neigh->nud_state = NUD_NOARP;
354 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
355 }
356 if (dev->header_ops->cache)
357 neigh->ops = &ndisc_hh_ops;
358 else
359 neigh->ops = &ndisc_generic_ops;
360 if (neigh->nud_state&NUD_VALID)
361 neigh->output = neigh->ops->connected_output;
362 else
363 neigh->output = neigh->ops->output;
364 }
365 in6_dev_put(in6_dev);
366 return 0;
367}
368
369static int pndisc_constructor(struct pneigh_entry *n)
370{
371 struct in6_addr *addr = (struct in6_addr *)&n->key;
372 struct in6_addr maddr;
373 struct net_device *dev = n->dev;
374
375 if (!dev || !__in6_dev_get(dev))
376 return -EINVAL;
377 addrconf_addr_solict_mult(addr, &maddr);
378 ipv6_dev_mc_inc(dev, &maddr);
379 return 0;
380}
381
382static void pndisc_destructor(struct pneigh_entry *n)
383{
384 struct in6_addr *addr = (struct in6_addr *)&n->key;
385 struct in6_addr maddr;
386 struct net_device *dev = n->dev;
387
388 if (!dev || !__in6_dev_get(dev))
389 return;
390 addrconf_addr_solict_mult(addr, &maddr);
391 ipv6_dev_mc_dec(dev, &maddr);
392}
393
394
395static bool ndisc_allow_add(const struct net_device *dev,
396 struct netlink_ext_ack *extack)
397{
398 struct inet6_dev *idev = __in6_dev_get(dev);
399
400 if (!idev || idev->cnf.disable_ipv6) {
401 NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
402 return false;
403 }
404
405 return true;
406}
407
408static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
409 int len)
410{
411 int hlen = LL_RESERVED_SPACE(dev);
412 int tlen = dev->needed_tailroom;
413 struct sock *sk = dev_net(dev)->ipv6.ndisc_sk;
414 struct sk_buff *skb;
415
416 skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
417 if (!skb) {
418 ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n",
419 __func__);
420 return NULL;
421 }
422
423 skb->protocol = htons(ETH_P_IPV6);
424 skb->dev = dev;
425
426 skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
427 skb_reset_transport_header(skb);
428
429
430
431
432 skb_set_owner_w(skb, sk);
433
434 return skb;
435}
436
437static void ip6_nd_hdr(struct sk_buff *skb,
438 const struct in6_addr *saddr,
439 const struct in6_addr *daddr,
440 int hop_limit, int len)
441{
442 struct ipv6hdr *hdr;
443 struct inet6_dev *idev;
444 unsigned tclass;
445
446 rcu_read_lock();
447 idev = __in6_dev_get(skb->dev);
448 tclass = idev ? idev->cnf.ndisc_tclass : 0;
449 rcu_read_unlock();
450
451 skb_push(skb, sizeof(*hdr));
452 skb_reset_network_header(skb);
453 hdr = ipv6_hdr(skb);
454
455 ip6_flow_hdr(hdr, tclass, 0);
456
457 hdr->payload_len = htons(len);
458 hdr->nexthdr = IPPROTO_ICMPV6;
459 hdr->hop_limit = hop_limit;
460
461 hdr->saddr = *saddr;
462 hdr->daddr = *daddr;
463}
464
465static void ndisc_send_skb(struct sk_buff *skb,
466 const struct in6_addr *daddr,
467 const struct in6_addr *saddr)
468{
469 struct dst_entry *dst = skb_dst(skb);
470 struct net *net = dev_net(skb->dev);
471 struct sock *sk = net->ipv6.ndisc_sk;
472 struct inet6_dev *idev;
473 int err;
474 struct icmp6hdr *icmp6h = icmp6_hdr(skb);
475 u8 type;
476
477 type = icmp6h->icmp6_type;
478
479 if (!dst) {
480 struct flowi6 fl6;
481 int oif = skb->dev->ifindex;
482
483 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
484 dst = icmp6_dst_alloc(skb->dev, &fl6);
485 if (IS_ERR(dst)) {
486 kfree_skb(skb);
487 return;
488 }
489
490 skb_dst_set(skb, dst);
491 }
492
493 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
494 IPPROTO_ICMPV6,
495 csum_partial(icmp6h,
496 skb->len, 0));
497
498 ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);
499
500 rcu_read_lock();
501 idev = __in6_dev_get(dst->dev);
502 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
503
504 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
505 net, sk, skb, NULL, dst->dev,
506 dst_output);
507 if (!err) {
508 ICMP6MSGOUT_INC_STATS(net, idev, type);
509 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
510 }
511
512 rcu_read_unlock();
513}
514
515void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
516 const struct in6_addr *solicited_addr,
517 bool router, bool solicited, bool override, bool inc_opt)
518{
519 struct sk_buff *skb;
520 struct in6_addr tmpaddr;
521 struct inet6_ifaddr *ifp;
522 const struct in6_addr *src_addr;
523 struct nd_msg *msg;
524 int optlen = 0;
525
526
527 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
528 if (ifp) {
529 src_addr = solicited_addr;
530 if (ifp->flags & IFA_F_OPTIMISTIC)
531 override = false;
532 inc_opt |= ifp->idev->cnf.force_tllao;
533 in6_ifa_put(ifp);
534 } else {
535 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
536 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
537 &tmpaddr))
538 return;
539 src_addr = &tmpaddr;
540 }
541
542 if (!dev->addr_len)
543 inc_opt = false;
544 if (inc_opt)
545 optlen += ndisc_opt_addr_space(dev,
546 NDISC_NEIGHBOUR_ADVERTISEMENT);
547
548 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
549 if (!skb)
550 return;
551
552 msg = skb_put(skb, sizeof(*msg));
553 *msg = (struct nd_msg) {
554 .icmph = {
555 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
556 .icmp6_router = router,
557 .icmp6_solicited = solicited,
558 .icmp6_override = override,
559 },
560 .target = *solicited_addr,
561 };
562
563 if (inc_opt)
564 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
565 dev->dev_addr,
566 NDISC_NEIGHBOUR_ADVERTISEMENT);
567
568 ndisc_send_skb(skb, daddr, src_addr);
569}
570
571static void ndisc_send_unsol_na(struct net_device *dev)
572{
573 struct inet6_dev *idev;
574 struct inet6_ifaddr *ifa;
575
576 idev = in6_dev_get(dev);
577 if (!idev)
578 return;
579
580 read_lock_bh(&idev->lock);
581 list_for_each_entry(ifa, &idev->addr_list, if_list) {
582
583 if (ifa->flags & IFA_F_TENTATIVE &&
584 !(ifa->flags & IFA_F_OPTIMISTIC))
585 continue;
586
587 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
588 !!idev->cnf.forwarding,
589 false, true,
590 true);
591 }
592 read_unlock_bh(&idev->lock);
593
594 in6_dev_put(idev);
595}
596
597void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
598 const struct in6_addr *daddr, const struct in6_addr *saddr,
599 u64 nonce)
600{
601 struct sk_buff *skb;
602 struct in6_addr addr_buf;
603 int inc_opt = dev->addr_len;
604 int optlen = 0;
605 struct nd_msg *msg;
606
607 if (!saddr) {
608 if (ipv6_get_lladdr(dev, &addr_buf,
609 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
610 return;
611 saddr = &addr_buf;
612 }
613
614 if (ipv6_addr_any(saddr))
615 inc_opt = false;
616 if (inc_opt)
617 optlen += ndisc_opt_addr_space(dev,
618 NDISC_NEIGHBOUR_SOLICITATION);
619 if (nonce != 0)
620 optlen += 8;
621
622 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
623 if (!skb)
624 return;
625
626 msg = skb_put(skb, sizeof(*msg));
627 *msg = (struct nd_msg) {
628 .icmph = {
629 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
630 },
631 .target = *solicit,
632 };
633
634 if (inc_opt)
635 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
636 dev->dev_addr,
637 NDISC_NEIGHBOUR_SOLICITATION);
638 if (nonce != 0) {
639 u8 *opt = skb_put(skb, 8);
640
641 opt[0] = ND_OPT_NONCE;
642 opt[1] = 8 >> 3;
643 memcpy(opt + 2, &nonce, 6);
644 }
645
646 ndisc_send_skb(skb, daddr, saddr);
647}
648
649void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
650 const struct in6_addr *daddr)
651{
652 struct sk_buff *skb;
653 struct rs_msg *msg;
654 int send_sllao = dev->addr_len;
655 int optlen = 0;
656
657#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
658
659
660
661
662
663
664
665
666 if (send_sllao) {
667 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
668 dev, 1);
669 if (ifp) {
670 if (ifp->flags & IFA_F_OPTIMISTIC) {
671 send_sllao = 0;
672 }
673 in6_ifa_put(ifp);
674 } else {
675 send_sllao = 0;
676 }
677 }
678#endif
679 if (send_sllao)
680 optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION);
681
682 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
683 if (!skb)
684 return;
685
686 msg = skb_put(skb, sizeof(*msg));
687 *msg = (struct rs_msg) {
688 .icmph = {
689 .icmp6_type = NDISC_ROUTER_SOLICITATION,
690 },
691 };
692
693 if (send_sllao)
694 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
695 dev->dev_addr,
696 NDISC_ROUTER_SOLICITATION);
697
698 ndisc_send_skb(skb, daddr, saddr);
699}
700
701
702static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
703{
704
705
706
707
708 dst_link_failure(skb);
709 kfree_skb(skb);
710}
711
712
713
714static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
715{
716 struct in6_addr *saddr = NULL;
717 struct in6_addr mcaddr;
718 struct net_device *dev = neigh->dev;
719 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
720 int probes = atomic_read(&neigh->probes);
721
722 if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
723 dev, false, 1,
724 IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
725 saddr = &ipv6_hdr(skb)->saddr;
726 probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
727 if (probes < 0) {
728 if (!(neigh->nud_state & NUD_VALID)) {
729 ND_PRINTK(1, dbg,
730 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
731 __func__, target);
732 }
733 ndisc_send_ns(dev, target, target, saddr, 0);
734 } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
735 neigh_app_ns(neigh);
736 } else {
737 addrconf_addr_solict_mult(target, &mcaddr);
738 ndisc_send_ns(dev, target, &mcaddr, saddr, 0);
739 }
740}
741
742static int pndisc_is_router(const void *pkey,
743 struct net_device *dev)
744{
745 struct pneigh_entry *n;
746 int ret = -1;
747
748 read_lock_bh(&nd_tbl.lock);
749 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
750 if (n)
751 ret = !!(n->flags & NTF_ROUTER);
752 read_unlock_bh(&nd_tbl.lock);
753
754 return ret;
755}
756
757void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
758 const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
759 struct ndisc_options *ndopts)
760{
761 neigh_update(neigh, lladdr, new, flags, 0);
762
763 ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts);
764}
765
766static void ndisc_recv_ns(struct sk_buff *skb)
767{
768 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
769 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
770 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
771 u8 *lladdr = NULL;
772 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
773 offsetof(struct nd_msg, opt));
774 struct ndisc_options ndopts;
775 struct net_device *dev = skb->dev;
776 struct inet6_ifaddr *ifp;
777 struct inet6_dev *idev = NULL;
778 struct neighbour *neigh;
779 int dad = ipv6_addr_any(saddr);
780 bool inc;
781 int is_router = -1;
782 u64 nonce = 0;
783
784 if (skb->len < sizeof(struct nd_msg)) {
785 ND_PRINTK(2, warn, "NS: packet too short\n");
786 return;
787 }
788
789 if (ipv6_addr_is_multicast(&msg->target)) {
790 ND_PRINTK(2, warn, "NS: multicast target address\n");
791 return;
792 }
793
794
795
796
797
798 if (dad && !ipv6_addr_is_solict_mult(daddr)) {
799 ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
800 return;
801 }
802
803 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
804 ND_PRINTK(2, warn, "NS: invalid ND options\n");
805 return;
806 }
807
808 if (ndopts.nd_opts_src_lladdr) {
809 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
810 if (!lladdr) {
811 ND_PRINTK(2, warn,
812 "NS: invalid link-layer address length\n");
813 return;
814 }
815
816
817
818
819
820
821 if (dad) {
822 ND_PRINTK(2, warn,
823 "NS: bad DAD packet (link-layer address option)\n");
824 return;
825 }
826 }
827 if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1)
828 memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6);
829
830 inc = ipv6_addr_is_multicast(daddr);
831
832 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
833 if (ifp) {
834have_ifp:
835 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
836 if (dad) {
837 if (nonce != 0 && ifp->dad_nonce == nonce) {
838 u8 *np = (u8 *)&nonce;
839
840 ND_PRINTK(2, notice,
841 "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n",
842 ifp->idev->dev->name,
843 &ifp->addr, np);
844 goto out;
845 }
846
847
848
849
850
851 addrconf_dad_failure(skb, ifp);
852 return;
853 } else {
854
855
856
857
858
859
860 if (!(ifp->flags & IFA_F_OPTIMISTIC))
861 goto out;
862 }
863 }
864
865 idev = ifp->idev;
866 } else {
867 struct net *net = dev_net(dev);
868
869
870 if (netif_is_l3_slave(dev)) {
871 struct net_device *mdev;
872
873 mdev = netdev_master_upper_dev_get_rcu(dev);
874 if (mdev) {
875 ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1);
876 if (ifp)
877 goto have_ifp;
878 }
879 }
880
881 idev = in6_dev_get(dev);
882 if (!idev) {
883
884 return;
885 }
886
887 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
888 (idev->cnf.forwarding &&
889 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
890 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
891 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
892 skb->pkt_type != PACKET_HOST &&
893 inc &&
894 NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) {
895
896
897
898
899
900
901
902 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
903 if (n)
904 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
905 goto out;
906 }
907 } else
908 goto out;
909 }
910
911 if (is_router < 0)
912 is_router = idev->cnf.forwarding;
913
914 if (dad) {
915 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
916 !!is_router, false, (ifp != NULL), true);
917 goto out;
918 }
919
920 if (inc)
921 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
922 else
923 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
924
925
926
927
928
929 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
930 !inc || lladdr || !dev->addr_len);
931 if (neigh)
932 ndisc_update(dev, neigh, lladdr, NUD_STALE,
933 NEIGH_UPDATE_F_WEAK_OVERRIDE|
934 NEIGH_UPDATE_F_OVERRIDE,
935 NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
936 if (neigh || !dev->header_ops) {
937 ndisc_send_na(dev, saddr, &msg->target, !!is_router,
938 true, (ifp != NULL && inc), inc);
939 if (neigh)
940 neigh_release(neigh);
941 }
942
943out:
944 if (ifp)
945 in6_ifa_put(ifp);
946 else
947 in6_dev_put(idev);
948}
949
950static void ndisc_recv_na(struct sk_buff *skb)
951{
952 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
953 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
954 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
955 u8 *lladdr = NULL;
956 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
957 offsetof(struct nd_msg, opt));
958 struct ndisc_options ndopts;
959 struct net_device *dev = skb->dev;
960 struct inet6_dev *idev = __in6_dev_get(dev);
961 struct inet6_ifaddr *ifp;
962 struct neighbour *neigh;
963
964 if (skb->len < sizeof(struct nd_msg)) {
965 ND_PRINTK(2, warn, "NA: packet too short\n");
966 return;
967 }
968
969 if (ipv6_addr_is_multicast(&msg->target)) {
970 ND_PRINTK(2, warn, "NA: target address is multicast\n");
971 return;
972 }
973
974 if (ipv6_addr_is_multicast(daddr) &&
975 msg->icmph.icmp6_solicited) {
976 ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
977 return;
978 }
979
980
981
982
983
984 if (!msg->icmph.icmp6_solicited && idev &&
985 idev->cnf.drop_unsolicited_na)
986 return;
987
988 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
989 ND_PRINTK(2, warn, "NS: invalid ND option\n");
990 return;
991 }
992 if (ndopts.nd_opts_tgt_lladdr) {
993 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
994 if (!lladdr) {
995 ND_PRINTK(2, warn,
996 "NA: invalid link-layer address length\n");
997 return;
998 }
999 }
1000 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
1001 if (ifp) {
1002 if (skb->pkt_type != PACKET_LOOPBACK
1003 && (ifp->flags & IFA_F_TENTATIVE)) {
1004 addrconf_dad_failure(skb, ifp);
1005 return;
1006 }
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016 if (skb->pkt_type != PACKET_LOOPBACK)
1017 ND_PRINTK(1, warn,
1018 "NA: %pM advertised our address %pI6c on %s!\n",
1019 eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name);
1020 in6_ifa_put(ifp);
1021 return;
1022 }
1023 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
1024
1025 if (neigh) {
1026 u8 old_flags = neigh->flags;
1027 struct net *net = dev_net(dev);
1028
1029 if (neigh->nud_state & NUD_FAILED)
1030 goto out;
1031
1032
1033
1034
1035
1036
1037 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
1038 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
1039 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
1040
1041 goto out;
1042 }
1043
1044 ndisc_update(dev, neigh, lladdr,
1045 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
1046 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1047 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
1048 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1049 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0),
1050 NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts);
1051
1052 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
1053
1054
1055
1056 rt6_clean_tohost(dev_net(dev), saddr);
1057 }
1058
1059out:
1060 neigh_release(neigh);
1061 }
1062}
1063
1064static void ndisc_recv_rs(struct sk_buff *skb)
1065{
1066 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1067 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1068 struct neighbour *neigh;
1069 struct inet6_dev *idev;
1070 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1071 struct ndisc_options ndopts;
1072 u8 *lladdr = NULL;
1073
1074 if (skb->len < sizeof(*rs_msg))
1075 return;
1076
1077 idev = __in6_dev_get(skb->dev);
1078 if (!idev) {
1079 ND_PRINTK(1, err, "RS: can't find in6 device\n");
1080 return;
1081 }
1082
1083
1084 if (!idev->cnf.forwarding)
1085 goto out;
1086
1087
1088
1089
1090
1091 if (ipv6_addr_any(saddr))
1092 goto out;
1093
1094
1095 if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) {
1096 ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
1097 goto out;
1098 }
1099
1100 if (ndopts.nd_opts_src_lladdr) {
1101 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1102 skb->dev);
1103 if (!lladdr)
1104 goto out;
1105 }
1106
1107 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1108 if (neigh) {
1109 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1110 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1111 NEIGH_UPDATE_F_OVERRIDE|
1112 NEIGH_UPDATE_F_OVERRIDE_ISROUTER,
1113 NDISC_ROUTER_SOLICITATION, &ndopts);
1114 neigh_release(neigh);
1115 }
1116out:
1117 return;
1118}
1119
1120static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1121{
1122 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1123 struct sk_buff *skb;
1124 struct nlmsghdr *nlh;
1125 struct nduseroptmsg *ndmsg;
1126 struct net *net = dev_net(ra->dev);
1127 int err;
1128 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1129 + (opt->nd_opt_len << 3));
1130 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1131
1132 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1133 if (!skb) {
1134 err = -ENOBUFS;
1135 goto errout;
1136 }
1137
1138 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1139 if (!nlh) {
1140 goto nla_put_failure;
1141 }
1142
1143 ndmsg = nlmsg_data(nlh);
1144 ndmsg->nduseropt_family = AF_INET6;
1145 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1146 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1147 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1148 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1149
1150 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1151
1152 if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))
1153 goto nla_put_failure;
1154 nlmsg_end(skb, nlh);
1155
1156 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
1157 return;
1158
1159nla_put_failure:
1160 nlmsg_free(skb);
1161 err = -EMSGSIZE;
1162errout:
1163 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1164}
1165
1166static void ndisc_router_discovery(struct sk_buff *skb)
1167{
1168 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1169 struct neighbour *neigh = NULL;
1170 struct inet6_dev *in6_dev;
1171 struct fib6_info *rt = NULL;
1172 struct net *net;
1173 int lifetime;
1174 struct ndisc_options ndopts;
1175 int optlen;
1176 unsigned int pref = 0;
1177 __u32 old_if_flags;
1178 bool send_ifinfo_notify = false;
1179
1180 __u8 *opt = (__u8 *)(ra_msg + 1);
1181
1182 optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
1183 sizeof(struct ra_msg);
1184
1185 ND_PRINTK(2, info,
1186 "RA: %s, dev: %s\n",
1187 __func__, skb->dev->name);
1188 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1189 ND_PRINTK(2, warn, "RA: source address is not link-local\n");
1190 return;
1191 }
1192 if (optlen < 0) {
1193 ND_PRINTK(2, warn, "RA: packet too short\n");
1194 return;
1195 }
1196
1197#ifdef CONFIG_IPV6_NDISC_NODETYPE
1198 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1199 ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
1200 return;
1201 }
1202#endif
1203
1204
1205
1206
1207
1208 in6_dev = __in6_dev_get(skb->dev);
1209 if (!in6_dev) {
1210 ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
1211 skb->dev->name);
1212 return;
1213 }
1214
1215 if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
1216 ND_PRINTK(2, warn, "RA: invalid ND options\n");
1217 return;
1218 }
1219
1220 if (!ipv6_accept_ra(in6_dev)) {
1221 ND_PRINTK(2, info,
1222 "RA: %s, did not accept ra for dev: %s\n",
1223 __func__, skb->dev->name);
1224 goto skip_linkparms;
1225 }
1226
1227#ifdef CONFIG_IPV6_NDISC_NODETYPE
1228
1229 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1230 ND_PRINTK(2, info,
1231 "RA: %s, nodetype is NODEFAULT, dev: %s\n",
1232 __func__, skb->dev->name);
1233 goto skip_linkparms;
1234 }
1235#endif
1236
1237 if (in6_dev->if_flags & IF_RS_SENT) {
1238
1239
1240
1241
1242 in6_dev->if_flags |= IF_RA_RCVD;
1243 }
1244
1245
1246
1247
1248
1249 old_if_flags = in6_dev->if_flags;
1250 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1251 IF_RA_OTHERCONF)) |
1252 (ra_msg->icmph.icmp6_addrconf_managed ?
1253 IF_RA_MANAGED : 0) |
1254 (ra_msg->icmph.icmp6_addrconf_other ?
1255 IF_RA_OTHERCONF : 0);
1256
1257 if (old_if_flags != in6_dev->if_flags)
1258 send_ifinfo_notify = true;
1259
1260 if (!in6_dev->cnf.accept_ra_defrtr) {
1261 ND_PRINTK(2, info,
1262 "RA: %s, defrtr is false for dev: %s\n",
1263 __func__, skb->dev->name);
1264 goto skip_defrtr;
1265 }
1266
1267
1268
1269
1270 net = dev_net(in6_dev->dev);
1271 if (!in6_dev->cnf.accept_ra_from_local &&
1272 ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) {
1273 ND_PRINTK(2, info,
1274 "RA from local address detected on dev: %s: default router ignored\n",
1275 skb->dev->name);
1276 goto skip_defrtr;
1277 }
1278
1279 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1280
1281#ifdef CONFIG_IPV6_ROUTER_PREF
1282 pref = ra_msg->icmph.icmp6_router_pref;
1283
1284 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1285 !in6_dev->cnf.accept_ra_rtr_pref)
1286 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1287#endif
1288
1289 rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
1290
1291 if (rt) {
1292 neigh = ip6_neigh_lookup(&rt->fib6_nh.fib_nh_gw6,
1293 rt->fib6_nh.fib_nh_dev, NULL,
1294 &ipv6_hdr(skb)->saddr);
1295 if (!neigh) {
1296 ND_PRINTK(0, err,
1297 "RA: %s got default router without neighbour\n",
1298 __func__);
1299 fib6_info_release(rt);
1300 return;
1301 }
1302 }
1303 if (rt && lifetime == 0) {
1304 ip6_del_rt(net, rt);
1305 rt = NULL;
1306 }
1307
1308 ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n",
1309 rt, lifetime, skb->dev->name);
1310 if (!rt && lifetime) {
1311 ND_PRINTK(3, info, "RA: adding default router\n");
1312
1313 rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr,
1314 skb->dev, pref);
1315 if (!rt) {
1316 ND_PRINTK(0, err,
1317 "RA: %s failed to add default route\n",
1318 __func__);
1319 return;
1320 }
1321
1322 neigh = ip6_neigh_lookup(&rt->fib6_nh.fib_nh_gw6,
1323 rt->fib6_nh.fib_nh_dev, NULL,
1324 &ipv6_hdr(skb)->saddr);
1325 if (!neigh) {
1326 ND_PRINTK(0, err,
1327 "RA: %s got default router without neighbour\n",
1328 __func__);
1329 fib6_info_release(rt);
1330 return;
1331 }
1332 neigh->flags |= NTF_ROUTER;
1333 } else if (rt) {
1334 rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1335 }
1336
1337 if (rt)
1338 fib6_set_expires(rt, jiffies + (HZ * lifetime));
1339 if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
1340 ra_msg->icmph.icmp6_hop_limit) {
1341 if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
1342 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1343 fib6_metric_set(rt, RTAX_HOPLIMIT,
1344 ra_msg->icmph.icmp6_hop_limit);
1345 } else {
1346 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
1347 }
1348 }
1349
1350skip_defrtr:
1351
1352
1353
1354
1355
1356 if (in6_dev->nd_parms) {
1357 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1358
1359 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1360 rtime = (rtime*HZ)/1000;
1361 if (rtime < HZ/10)
1362 rtime = HZ/10;
1363 NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
1364 in6_dev->tstamp = jiffies;
1365 send_ifinfo_notify = true;
1366 }
1367
1368 rtime = ntohl(ra_msg->reachable_time);
1369 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1370 rtime = (rtime*HZ)/1000;
1371
1372 if (rtime < HZ/10)
1373 rtime = HZ/10;
1374
1375 if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) {
1376 NEIGH_VAR_SET(in6_dev->nd_parms,
1377 BASE_REACHABLE_TIME, rtime);
1378 NEIGH_VAR_SET(in6_dev->nd_parms,
1379 GC_STALETIME, 3 * rtime);
1380 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1381 in6_dev->tstamp = jiffies;
1382 send_ifinfo_notify = true;
1383 }
1384 }
1385 }
1386
1387
1388
1389
1390 if (send_ifinfo_notify)
1391 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1392
1393skip_linkparms:
1394
1395
1396
1397
1398
1399 if (!neigh)
1400 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1401 skb->dev, 1);
1402 if (neigh) {
1403 u8 *lladdr = NULL;
1404 if (ndopts.nd_opts_src_lladdr) {
1405 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1406 skb->dev);
1407 if (!lladdr) {
1408 ND_PRINTK(2, warn,
1409 "RA: invalid link-layer address length\n");
1410 goto out;
1411 }
1412 }
1413 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1414 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1415 NEIGH_UPDATE_F_OVERRIDE|
1416 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1417 NEIGH_UPDATE_F_ISROUTER,
1418 NDISC_ROUTER_ADVERTISEMENT, &ndopts);
1419 }
1420
1421 if (!ipv6_accept_ra(in6_dev)) {
1422 ND_PRINTK(2, info,
1423 "RA: %s, accept_ra is false for dev: %s\n",
1424 __func__, skb->dev->name);
1425 goto out;
1426 }
1427
1428#ifdef CONFIG_IPV6_ROUTE_INFO
1429 if (!in6_dev->cnf.accept_ra_from_local &&
1430 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
1431 in6_dev->dev, 0)) {
1432 ND_PRINTK(2, info,
1433 "RA from local address detected on dev: %s: router info ignored.\n",
1434 skb->dev->name);
1435 goto skip_routeinfo;
1436 }
1437
1438 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1439 struct nd_opt_hdr *p;
1440 for (p = ndopts.nd_opts_ri;
1441 p;
1442 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1443 struct route_info *ri = (struct route_info *)p;
1444#ifdef CONFIG_IPV6_NDISC_NODETYPE
1445 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1446 ri->prefix_len == 0)
1447 continue;
1448#endif
1449 if (ri->prefix_len == 0 &&
1450 !in6_dev->cnf.accept_ra_defrtr)
1451 continue;
1452 if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen)
1453 continue;
1454 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1455 continue;
1456 rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,
1457 &ipv6_hdr(skb)->saddr);
1458 }
1459 }
1460
1461skip_routeinfo:
1462#endif
1463
1464#ifdef CONFIG_IPV6_NDISC_NODETYPE
1465
1466 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1467 ND_PRINTK(2, info,
1468 "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
1469 __func__, skb->dev->name);
1470 goto out;
1471 }
1472#endif
1473
1474 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1475 struct nd_opt_hdr *p;
1476 for (p = ndopts.nd_opts_pi;
1477 p;
1478 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1479 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1480 (p->nd_opt_len) << 3,
1481 ndopts.nd_opts_src_lladdr != NULL);
1482 }
1483 }
1484
1485 if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) {
1486 __be32 n;
1487 u32 mtu;
1488
1489 memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1490 mtu = ntohl(n);
1491
1492 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1493 ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
1494 } else if (in6_dev->cnf.mtu6 != mtu) {
1495 in6_dev->cnf.mtu6 = mtu;
1496 fib6_metric_set(rt, RTAX_MTU, mtu);
1497 rt6_mtu_change(skb->dev, mtu);
1498 }
1499 }
1500
1501 if (ndopts.nd_useropts) {
1502 struct nd_opt_hdr *p;
1503 for (p = ndopts.nd_useropts;
1504 p;
1505 p = ndisc_next_useropt(skb->dev, p,
1506 ndopts.nd_useropts_end)) {
1507 ndisc_ra_useropt(skb, p);
1508 }
1509 }
1510
1511 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1512 ND_PRINTK(2, warn, "RA: invalid RA options\n");
1513 }
1514out:
1515 fib6_info_release(rt);
1516 if (neigh)
1517 neigh_release(neigh);
1518}
1519
1520static void ndisc_redirect_rcv(struct sk_buff *skb)
1521{
1522 u8 *hdr;
1523 struct ndisc_options ndopts;
1524 struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
1525 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
1526 offsetof(struct rd_msg, opt));
1527
1528#ifdef CONFIG_IPV6_NDISC_NODETYPE
1529 switch (skb->ndisc_nodetype) {
1530 case NDISC_NODETYPE_HOST:
1531 case NDISC_NODETYPE_NODEFAULT:
1532 ND_PRINTK(2, warn,
1533 "Redirect: from host or unauthorized router\n");
1534 return;
1535 }
1536#endif
1537
1538 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1539 ND_PRINTK(2, warn,
1540 "Redirect: source address is not link-local\n");
1541 return;
1542 }
1543
1544 if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
1545 return;
1546
1547 if (!ndopts.nd_opts_rh) {
1548 ip6_redirect_no_header(skb, dev_net(skb->dev),
1549 skb->dev->ifindex);
1550 return;
1551 }
1552
1553 hdr = (u8 *)ndopts.nd_opts_rh;
1554 hdr += 8;
1555 if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
1556 return;
1557
1558 icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
1559}
1560
1561static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
1562 struct sk_buff *orig_skb,
1563 int rd_len)
1564{
1565 u8 *opt = skb_put(skb, rd_len);
1566
1567 memset(opt, 0, 8);
1568 *(opt++) = ND_OPT_REDIRECT_HDR;
1569 *(opt++) = (rd_len >> 3);
1570 opt += 6;
1571
1572 skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt,
1573 rd_len - 8);
1574}
1575
1576void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
1577{
1578 struct net_device *dev = skb->dev;
1579 struct net *net = dev_net(dev);
1580 struct sock *sk = net->ipv6.ndisc_sk;
1581 int optlen = 0;
1582 struct inet_peer *peer;
1583 struct sk_buff *buff;
1584 struct rd_msg *msg;
1585 struct in6_addr saddr_buf;
1586 struct rt6_info *rt;
1587 struct dst_entry *dst;
1588 struct flowi6 fl6;
1589 int rd_len;
1590 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL,
1591 ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL;
1592 bool ret;
1593
1594 if (netif_is_l3_master(skb->dev)) {
1595 dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif);
1596 if (!dev)
1597 return;
1598 }
1599
1600 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1601 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
1602 dev->name);
1603 return;
1604 }
1605
1606 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1607 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1608 ND_PRINTK(2, warn,
1609 "Redirect: target address is not link-local unicast\n");
1610 return;
1611 }
1612
1613 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
1614 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1615
1616 dst = ip6_route_output(net, NULL, &fl6);
1617 if (dst->error) {
1618 dst_release(dst);
1619 return;
1620 }
1621 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1622 if (IS_ERR(dst))
1623 return;
1624
1625 rt = (struct rt6_info *) dst;
1626
1627 if (rt->rt6i_flags & RTF_GATEWAY) {
1628 ND_PRINTK(2, warn,
1629 "Redirect: destination is not a neighbour\n");
1630 goto release;
1631 }
1632 peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1);
1633 ret = inet_peer_xrlim_allow(peer, 1*HZ);
1634 if (peer)
1635 inet_putpeer(peer);
1636 if (!ret)
1637 goto release;
1638
1639 if (dev->addr_len) {
1640 struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
1641 if (!neigh) {
1642 ND_PRINTK(2, warn,
1643 "Redirect: no neigh for target address\n");
1644 goto release;
1645 }
1646
1647 read_lock_bh(&neigh->lock);
1648 if (neigh->nud_state & NUD_VALID) {
1649 memcpy(ha_buf, neigh->ha, dev->addr_len);
1650 read_unlock_bh(&neigh->lock);
1651 ha = ha_buf;
1652 optlen += ndisc_redirect_opt_addr_space(dev, neigh,
1653 ops_data_buf,
1654 &ops_data);
1655 } else
1656 read_unlock_bh(&neigh->lock);
1657
1658 neigh_release(neigh);
1659 }
1660
1661 rd_len = min_t(unsigned int,
1662 IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
1663 skb->len + 8);
1664 rd_len &= ~0x7;
1665 optlen += rd_len;
1666
1667 buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
1668 if (!buff)
1669 goto release;
1670
1671 msg = skb_put(buff, sizeof(*msg));
1672 *msg = (struct rd_msg) {
1673 .icmph = {
1674 .icmp6_type = NDISC_REDIRECT,
1675 },
1676 .target = *target,
1677 .dest = ipv6_hdr(skb)->daddr,
1678 };
1679
1680
1681
1682
1683
1684 if (ha)
1685 ndisc_fill_redirect_addr_option(buff, ha, ops_data);
1686
1687
1688
1689
1690
1691 if (rd_len)
1692 ndisc_fill_redirect_hdr_option(buff, skb, rd_len);
1693
1694 skb_dst_set(buff, dst);
1695 ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
1696 return;
1697
1698release:
1699 dst_release(dst);
1700}
1701
1702static void pndisc_redo(struct sk_buff *skb)
1703{
1704 ndisc_recv_ns(skb);
1705 kfree_skb(skb);
1706}
1707
1708static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
1709{
1710 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1711
1712 if (!idev)
1713 return true;
1714 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
1715 idev->cnf.suppress_frag_ndisc) {
1716 net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
1717 return true;
1718 }
1719 return false;
1720}
1721
1722int ndisc_rcv(struct sk_buff *skb)
1723{
1724 struct nd_msg *msg;
1725
1726 if (ndisc_suppress_frag_ndisc(skb))
1727 return 0;
1728
1729 if (skb_linearize(skb))
1730 return 0;
1731
1732 msg = (struct nd_msg *)skb_transport_header(skb);
1733
1734 __skb_push(skb, skb->data - skb_transport_header(skb));
1735
1736 if (ipv6_hdr(skb)->hop_limit != 255) {
1737 ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
1738 ipv6_hdr(skb)->hop_limit);
1739 return 0;
1740 }
1741
1742 if (msg->icmph.icmp6_code != 0) {
1743 ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
1744 msg->icmph.icmp6_code);
1745 return 0;
1746 }
1747
1748 switch (msg->icmph.icmp6_type) {
1749 case NDISC_NEIGHBOUR_SOLICITATION:
1750 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1751 ndisc_recv_ns(skb);
1752 break;
1753
1754 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1755 ndisc_recv_na(skb);
1756 break;
1757
1758 case NDISC_ROUTER_SOLICITATION:
1759 ndisc_recv_rs(skb);
1760 break;
1761
1762 case NDISC_ROUTER_ADVERTISEMENT:
1763 ndisc_router_discovery(skb);
1764 break;
1765
1766 case NDISC_REDIRECT:
1767 ndisc_redirect_rcv(skb);
1768 break;
1769 }
1770
1771 return 0;
1772}
1773
1774static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1775{
1776 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1777 struct netdev_notifier_change_info *change_info;
1778 struct net *net = dev_net(dev);
1779 struct inet6_dev *idev;
1780
1781 switch (event) {
1782 case NETDEV_CHANGEADDR:
1783 neigh_changeaddr(&nd_tbl, dev);
1784 fib6_run_gc(0, net, false);
1785
1786 case NETDEV_UP:
1787 idev = in6_dev_get(dev);
1788 if (!idev)
1789 break;
1790 if (idev->cnf.ndisc_notify ||
1791 net->ipv6.devconf_all->ndisc_notify)
1792 ndisc_send_unsol_na(dev);
1793 in6_dev_put(idev);
1794 break;
1795 case NETDEV_CHANGE:
1796 change_info = ptr;
1797 if (change_info->flags_changed & IFF_NOARP)
1798 neigh_changeaddr(&nd_tbl, dev);
1799 if (!netif_carrier_ok(dev))
1800 neigh_carrier_down(&nd_tbl, dev);
1801 break;
1802 case NETDEV_DOWN:
1803 neigh_ifdown(&nd_tbl, dev);
1804 fib6_run_gc(0, net, false);
1805 break;
1806 case NETDEV_NOTIFY_PEERS:
1807 ndisc_send_unsol_na(dev);
1808 break;
1809 default:
1810 break;
1811 }
1812
1813 return NOTIFY_DONE;
1814}
1815
1816static struct notifier_block ndisc_netdev_notifier = {
1817 .notifier_call = ndisc_netdev_event,
1818 .priority = ADDRCONF_NOTIFY_PRIORITY - 5,
1819};
1820
1821#ifdef CONFIG_SYSCTL
1822static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1823 const char *func, const char *dev_name)
1824{
1825 static char warncomm[TASK_COMM_LEN];
1826 static int warned;
1827 if (strcmp(warncomm, current->comm) && warned < 5) {
1828 strcpy(warncomm, current->comm);
1829 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
1830 warncomm, func,
1831 dev_name, ctl->procname,
1832 dev_name, ctl->procname);
1833 warned++;
1834 }
1835}
1836
1837int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
1838{
1839 struct net_device *dev = ctl->extra1;
1840 struct inet6_dev *idev;
1841 int ret;
1842
1843 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1844 (strcmp(ctl->procname, "base_reachable_time") == 0))
1845 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1846
1847 if (strcmp(ctl->procname, "retrans_time") == 0)
1848 ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);
1849
1850 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1851 ret = neigh_proc_dointvec_jiffies(ctl, write,
1852 buffer, lenp, ppos);
1853
1854 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1855 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1856 ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
1857 buffer, lenp, ppos);
1858 else
1859 ret = -1;
1860
1861 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1862 if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
1863 idev->nd_parms->reachable_time =
1864 neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
1865 idev->tstamp = jiffies;
1866 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1867 in6_dev_put(idev);
1868 }
1869 return ret;
1870}
1871
1872
1873#endif
1874
1875static int __net_init ndisc_net_init(struct net *net)
1876{
1877 struct ipv6_pinfo *np;
1878 struct sock *sk;
1879 int err;
1880
1881 err = inet_ctl_sock_create(&sk, PF_INET6,
1882 SOCK_RAW, IPPROTO_ICMPV6, net);
1883 if (err < 0) {
1884 ND_PRINTK(0, err,
1885 "NDISC: Failed to initialize the control socket (err %d)\n",
1886 err);
1887 return err;
1888 }
1889
1890 net->ipv6.ndisc_sk = sk;
1891
1892 np = inet6_sk(sk);
1893 np->hop_limit = 255;
1894
1895 np->mc_loop = 0;
1896
1897 return 0;
1898}
1899
1900static void __net_exit ndisc_net_exit(struct net *net)
1901{
1902 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1903}
1904
1905static struct pernet_operations ndisc_net_ops = {
1906 .init = ndisc_net_init,
1907 .exit = ndisc_net_exit,
1908};
1909
1910int __init ndisc_init(void)
1911{
1912 int err;
1913
1914 err = register_pernet_subsys(&ndisc_net_ops);
1915 if (err)
1916 return err;
1917
1918
1919
1920 neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
1921
1922#ifdef CONFIG_SYSCTL
1923 err = neigh_sysctl_register(NULL, &nd_tbl.parms,
1924 ndisc_ifinfo_sysctl_change);
1925 if (err)
1926 goto out_unregister_pernet;
1927out:
1928#endif
1929 return err;
1930
1931#ifdef CONFIG_SYSCTL
1932out_unregister_pernet:
1933 unregister_pernet_subsys(&ndisc_net_ops);
1934 goto out;
1935#endif
1936}
1937
1938int __init ndisc_late_init(void)
1939{
1940 return register_netdevice_notifier(&ndisc_netdev_notifier);
1941}
1942
1943void ndisc_late_cleanup(void)
1944{
1945 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1946}
1947
1948void ndisc_cleanup(void)
1949{
1950#ifdef CONFIG_SYSCTL
1951 neigh_sysctl_unregister(&nd_tbl.parms);
1952#endif
1953 neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
1954 unregister_pernet_subsys(&ndisc_net_ops);
1955}
1956
