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1/*
2 * Neighbour Discovery for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Mike Shaver <shaver@ingenia.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Alexey I. Froloff : RFC6106 (DNSSL) support
19 * Pierre Ynard : export userland ND options
20 * through netlink (RDNSS support)
21 * Lars Fenneberg : fixed MTU setting on receipt
22 * of an RA.
23 * Janos Farkas : kmalloc failure checks
24 * Alexey Kuznetsov : state machine reworked
25 * and moved to net/core.
26 * Pekka Savola : RFC2461 validation
27 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
28 */
29
30#define pr_fmt(fmt) "ICMPv6: " fmt
31
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/types.h>
35#include <linux/socket.h>
36#include <linux/sockios.h>
37#include <linux/sched.h>
38#include <linux/net.h>
39#include <linux/in6.h>
40#include <linux/route.h>
41#include <linux/init.h>
42#include <linux/rcupdate.h>
43#include <linux/slab.h>
44#ifdef CONFIG_SYSCTL
45#include <linux/sysctl.h>
46#endif
47
48#include <linux/if_addr.h>
49#include <linux/if_arp.h>
50#include <linux/ipv6.h>
51#include <linux/icmpv6.h>
52#include <linux/jhash.h>
53
54#include <net/sock.h>
55#include <net/snmp.h>
56
57#include <net/ipv6.h>
58#include <net/protocol.h>
59#include <net/ndisc.h>
60#include <net/ip6_route.h>
61#include <net/addrconf.h>
62#include <net/icmp.h>
63
64#include <net/netlink.h>
65#include <linux/rtnetlink.h>
66
67#include <net/flow.h>
68#include <net/ip6_checksum.h>
69#include <net/inet_common.h>
70#include <net/l3mdev.h>
71#include <linux/proc_fs.h>
72
73#include <linux/netfilter.h>
74#include <linux/netfilter_ipv6.h>
75
76/* Set to 3 to get tracing... */
77#define ND_DEBUG 1
78
79#define ND_PRINTK(val, level, fmt, ...) \
80do { \
81 if (val <= ND_DEBUG) \
82 net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
83} while (0)
84
85static u32 ndisc_hash(const void *pkey,
86 const struct net_device *dev,
87 __u32 *hash_rnd);
88static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
89static int ndisc_constructor(struct neighbour *neigh);
90static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
91static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
92static int pndisc_constructor(struct pneigh_entry *n);
93static void pndisc_destructor(struct pneigh_entry *n);
94static void pndisc_redo(struct sk_buff *skb);
95
96static const struct neigh_ops ndisc_generic_ops = {
97 .family = AF_INET6,
98 .solicit = ndisc_solicit,
99 .error_report = ndisc_error_report,
100 .output = neigh_resolve_output,
101 .connected_output = neigh_connected_output,
102};
103
104static const struct neigh_ops ndisc_hh_ops = {
105 .family = AF_INET6,
106 .solicit = ndisc_solicit,
107 .error_report = ndisc_error_report,
108 .output = neigh_resolve_output,
109 .connected_output = neigh_resolve_output,
110};
111
112
113static const struct neigh_ops ndisc_direct_ops = {
114 .family = AF_INET6,
115 .output = neigh_direct_output,
116 .connected_output = neigh_direct_output,
117};
118
119struct neigh_table nd_tbl = {
120 .family = AF_INET6,
121 .key_len = sizeof(struct in6_addr),
122 .protocol = cpu_to_be16(ETH_P_IPV6),
123 .hash = ndisc_hash,
124 .key_eq = ndisc_key_eq,
125 .constructor = ndisc_constructor,
126 .pconstructor = pndisc_constructor,
127 .pdestructor = pndisc_destructor,
128 .proxy_redo = pndisc_redo,
129 .id = "ndisc_cache",
130 .parms = {
131 .tbl = &nd_tbl,
132 .reachable_time = ND_REACHABLE_TIME,
133 .data = {
134 [NEIGH_VAR_MCAST_PROBES] = 3,
135 [NEIGH_VAR_UCAST_PROBES] = 3,
136 [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
137 [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
138 [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
139 [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
140 [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024,
141 [NEIGH_VAR_PROXY_QLEN] = 64,
142 [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
143 [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
144 },
145 },
146 .gc_interval = 30 * HZ,
147 .gc_thresh1 = 128,
148 .gc_thresh2 = 512,
149 .gc_thresh3 = 1024,
150};
151EXPORT_SYMBOL_GPL(nd_tbl);
152
153static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data)
154{
155 int pad = ndisc_addr_option_pad(skb->dev->type);
156 int data_len = skb->dev->addr_len;
157 int space = ndisc_opt_addr_space(skb->dev);
158 u8 *opt = skb_put(skb, space);
159
160 opt[0] = type;
161 opt[1] = space>>3;
162
163 memset(opt + 2, 0, pad);
164 opt += pad;
165 space -= pad;
166
167 memcpy(opt+2, data, data_len);
168 data_len += 2;
169 opt += data_len;
170 space -= data_len;
171 if (space > 0)
172 memset(opt, 0, space);
173}
174
175static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
176 struct nd_opt_hdr *end)
177{
178 int type;
179 if (!cur || !end || cur >= end)
180 return NULL;
181 type = cur->nd_opt_type;
182 do {
183 cur = ((void *)cur) + (cur->nd_opt_len << 3);
184 } while (cur < end && cur->nd_opt_type != type);
185 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
186}
187
188static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
189{
190 return opt->nd_opt_type == ND_OPT_RDNSS ||
191 opt->nd_opt_type == ND_OPT_DNSSL;
192}
193
194static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
195 struct nd_opt_hdr *end)
196{
197 if (!cur || !end || cur >= end)
198 return NULL;
199 do {
200 cur = ((void *)cur) + (cur->nd_opt_len << 3);
201 } while (cur < end && !ndisc_is_useropt(cur));
202 return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
203}
204
205struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
206 struct ndisc_options *ndopts)
207{
208 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
209
210 if (!nd_opt || opt_len < 0 || !ndopts)
211 return NULL;
212 memset(ndopts, 0, sizeof(*ndopts));
213 while (opt_len) {
214 int l;
215 if (opt_len < sizeof(struct nd_opt_hdr))
216 return NULL;
217 l = nd_opt->nd_opt_len << 3;
218 if (opt_len < l || l == 0)
219 return NULL;
220 switch (nd_opt->nd_opt_type) {
221 case ND_OPT_SOURCE_LL_ADDR:
222 case ND_OPT_TARGET_LL_ADDR:
223 case ND_OPT_MTU:
224 case ND_OPT_REDIRECT_HDR:
225 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
226 ND_PRINTK(2, warn,
227 "%s: duplicated ND6 option found: type=%d\n",
228 __func__, nd_opt->nd_opt_type);
229 } else {
230 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
231 }
232 break;
233 case ND_OPT_PREFIX_INFO:
234 ndopts->nd_opts_pi_end = nd_opt;
235 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
236 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
237 break;
238#ifdef CONFIG_IPV6_ROUTE_INFO
239 case ND_OPT_ROUTE_INFO:
240 ndopts->nd_opts_ri_end = nd_opt;
241 if (!ndopts->nd_opts_ri)
242 ndopts->nd_opts_ri = nd_opt;
243 break;
244#endif
245 default:
246 if (ndisc_is_useropt(nd_opt)) {
247 ndopts->nd_useropts_end = nd_opt;
248 if (!ndopts->nd_useropts)
249 ndopts->nd_useropts = nd_opt;
250 } else {
251 /*
252 * Unknown options must be silently ignored,
253 * to accommodate future extension to the
254 * protocol.
255 */
256 ND_PRINTK(2, notice,
257 "%s: ignored unsupported option; type=%d, len=%d\n",
258 __func__,
259 nd_opt->nd_opt_type,
260 nd_opt->nd_opt_len);
261 }
262 }
263 opt_len -= l;
264 nd_opt = ((void *)nd_opt) + l;
265 }
266 return ndopts;
267}
268
269int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
270{
271 switch (dev->type) {
272 case ARPHRD_ETHER:
273 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
274 case ARPHRD_FDDI:
275 ipv6_eth_mc_map(addr, buf);
276 return 0;
277 case ARPHRD_ARCNET:
278 ipv6_arcnet_mc_map(addr, buf);
279 return 0;
280 case ARPHRD_INFINIBAND:
281 ipv6_ib_mc_map(addr, dev->broadcast, buf);
282 return 0;
283 case ARPHRD_IPGRE:
284 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
285 default:
286 if (dir) {
287 memcpy(buf, dev->broadcast, dev->addr_len);
288 return 0;
289 }
290 }
291 return -EINVAL;
292}
293EXPORT_SYMBOL(ndisc_mc_map);
294
295static u32 ndisc_hash(const void *pkey,
296 const struct net_device *dev,
297 __u32 *hash_rnd)
298{
299 return ndisc_hashfn(pkey, dev, hash_rnd);
300}
301
302static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
303{
304 return neigh_key_eq128(n, pkey);
305}
306
307static int ndisc_constructor(struct neighbour *neigh)
308{
309 struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
310 struct net_device *dev = neigh->dev;
311 struct inet6_dev *in6_dev;
312 struct neigh_parms *parms;
313 bool is_multicast = ipv6_addr_is_multicast(addr);
314
315 in6_dev = in6_dev_get(dev);
316 if (!in6_dev) {
317 return -EINVAL;
318 }
319
320 parms = in6_dev->nd_parms;
321 __neigh_parms_put(neigh->parms);
322 neigh->parms = neigh_parms_clone(parms);
323
324 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
325 if (!dev->header_ops) {
326 neigh->nud_state = NUD_NOARP;
327 neigh->ops = &ndisc_direct_ops;
328 neigh->output = neigh_direct_output;
329 } else {
330 if (is_multicast) {
331 neigh->nud_state = NUD_NOARP;
332 ndisc_mc_map(addr, neigh->ha, dev, 1);
333 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
334 neigh->nud_state = NUD_NOARP;
335 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
336 if (dev->flags&IFF_LOOPBACK)
337 neigh->type = RTN_LOCAL;
338 } else if (dev->flags&IFF_POINTOPOINT) {
339 neigh->nud_state = NUD_NOARP;
340 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
341 }
342 if (dev->header_ops->cache)
343 neigh->ops = &ndisc_hh_ops;
344 else
345 neigh->ops = &ndisc_generic_ops;
346 if (neigh->nud_state&NUD_VALID)
347 neigh->output = neigh->ops->connected_output;
348 else
349 neigh->output = neigh->ops->output;
350 }
351 in6_dev_put(in6_dev);
352 return 0;
353}
354
355static int pndisc_constructor(struct pneigh_entry *n)
356{
357 struct in6_addr *addr = (struct in6_addr *)&n->key;
358 struct in6_addr maddr;
359 struct net_device *dev = n->dev;
360
361 if (!dev || !__in6_dev_get(dev))
362 return -EINVAL;
363 addrconf_addr_solict_mult(addr, &maddr);
364 ipv6_dev_mc_inc(dev, &maddr);
365 return 0;
366}
367
368static void pndisc_destructor(struct pneigh_entry *n)
369{
370 struct in6_addr *addr = (struct in6_addr *)&n->key;
371 struct in6_addr maddr;
372 struct net_device *dev = n->dev;
373
374 if (!dev || !__in6_dev_get(dev))
375 return;
376 addrconf_addr_solict_mult(addr, &maddr);
377 ipv6_dev_mc_dec(dev, &maddr);
378}
379
380static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
381 int len)
382{
383 int hlen = LL_RESERVED_SPACE(dev);
384 int tlen = dev->needed_tailroom;
385 struct sock *sk = dev_net(dev)->ipv6.ndisc_sk;
386 struct sk_buff *skb;
387
388 skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
389 if (!skb) {
390 ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n",
391 __func__);
392 return NULL;
393 }
394
395 skb->protocol = htons(ETH_P_IPV6);
396 skb->dev = dev;
397
398 skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
399 skb_reset_transport_header(skb);
400
401 /* Manually assign socket ownership as we avoid calling
402 * sock_alloc_send_pskb() to bypass wmem buffer limits
403 */
404 skb_set_owner_w(skb, sk);
405
406 return skb;
407}
408
409static void ip6_nd_hdr(struct sk_buff *skb,
410 const struct in6_addr *saddr,
411 const struct in6_addr *daddr,
412 int hop_limit, int len)
413{
414 struct ipv6hdr *hdr;
415
416 skb_push(skb, sizeof(*hdr));
417 skb_reset_network_header(skb);
418 hdr = ipv6_hdr(skb);
419
420 ip6_flow_hdr(hdr, 0, 0);
421
422 hdr->payload_len = htons(len);
423 hdr->nexthdr = IPPROTO_ICMPV6;
424 hdr->hop_limit = hop_limit;
425
426 hdr->saddr = *saddr;
427 hdr->daddr = *daddr;
428}
429
430static void ndisc_send_skb(struct sk_buff *skb,
431 const struct in6_addr *daddr,
432 const struct in6_addr *saddr)
433{
434 struct dst_entry *dst = skb_dst(skb);
435 struct net *net = dev_net(skb->dev);
436 struct sock *sk = net->ipv6.ndisc_sk;
437 struct inet6_dev *idev;
438 int err;
439 struct icmp6hdr *icmp6h = icmp6_hdr(skb);
440 u8 type;
441
442 type = icmp6h->icmp6_type;
443
444 if (!dst) {
445 struct flowi6 fl6;
446 int oif = l3mdev_fib_oif(skb->dev);
447
448 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
449 if (oif != skb->dev->ifindex)
450 fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC;
451 dst = icmp6_dst_alloc(skb->dev, &fl6);
452 if (IS_ERR(dst)) {
453 kfree_skb(skb);
454 return;
455 }
456
457 skb_dst_set(skb, dst);
458 }
459
460 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
461 IPPROTO_ICMPV6,
462 csum_partial(icmp6h,
463 skb->len, 0));
464
465 ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);
466
467 rcu_read_lock();
468 idev = __in6_dev_get(dst->dev);
469 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
470
471 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
472 net, sk, skb, NULL, dst->dev,
473 dst_output);
474 if (!err) {
475 ICMP6MSGOUT_INC_STATS(net, idev, type);
476 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
477 }
478
479 rcu_read_unlock();
480}
481
482void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
483 const struct in6_addr *solicited_addr,
484 bool router, bool solicited, bool override, bool inc_opt)
485{
486 struct sk_buff *skb;
487 struct in6_addr tmpaddr;
488 struct inet6_ifaddr *ifp;
489 const struct in6_addr *src_addr;
490 struct nd_msg *msg;
491 int optlen = 0;
492
493 /* for anycast or proxy, solicited_addr != src_addr */
494 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
495 if (ifp) {
496 src_addr = solicited_addr;
497 if (ifp->flags & IFA_F_OPTIMISTIC)
498 override = false;
499 inc_opt |= ifp->idev->cnf.force_tllao;
500 in6_ifa_put(ifp);
501 } else {
502 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
503 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
504 &tmpaddr))
505 return;
506 src_addr = &tmpaddr;
507 }
508
509 if (!dev->addr_len)
510 inc_opt = 0;
511 if (inc_opt)
512 optlen += ndisc_opt_addr_space(dev);
513
514 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
515 if (!skb)
516 return;
517
518 msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));
519 *msg = (struct nd_msg) {
520 .icmph = {
521 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
522 .icmp6_router = router,
523 .icmp6_solicited = solicited,
524 .icmp6_override = override,
525 },
526 .target = *solicited_addr,
527 };
528
529 if (inc_opt)
530 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
531 dev->dev_addr);
532
533
534 ndisc_send_skb(skb, daddr, src_addr);
535}
536
537static void ndisc_send_unsol_na(struct net_device *dev)
538{
539 struct inet6_dev *idev;
540 struct inet6_ifaddr *ifa;
541
542 idev = in6_dev_get(dev);
543 if (!idev)
544 return;
545
546 read_lock_bh(&idev->lock);
547 list_for_each_entry(ifa, &idev->addr_list, if_list) {
548 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
549 /*router=*/ !!idev->cnf.forwarding,
550 /*solicited=*/ false, /*override=*/ true,
551 /*inc_opt=*/ true);
552 }
553 read_unlock_bh(&idev->lock);
554
555 in6_dev_put(idev);
556}
557
558void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
559 const struct in6_addr *daddr, const struct in6_addr *saddr)
560{
561 struct sk_buff *skb;
562 struct in6_addr addr_buf;
563 int inc_opt = dev->addr_len;
564 int optlen = 0;
565 struct nd_msg *msg;
566
567 if (!saddr) {
568 if (ipv6_get_lladdr(dev, &addr_buf,
569 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
570 return;
571 saddr = &addr_buf;
572 }
573
574 if (ipv6_addr_any(saddr))
575 inc_opt = false;
576 if (inc_opt)
577 optlen += ndisc_opt_addr_space(dev);
578
579 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
580 if (!skb)
581 return;
582
583 msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));
584 *msg = (struct nd_msg) {
585 .icmph = {
586 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
587 },
588 .target = *solicit,
589 };
590
591 if (inc_opt)
592 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
593 dev->dev_addr);
594
595 ndisc_send_skb(skb, daddr, saddr);
596}
597
598void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
599 const struct in6_addr *daddr)
600{
601 struct sk_buff *skb;
602 struct rs_msg *msg;
603 int send_sllao = dev->addr_len;
604 int optlen = 0;
605
606#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
607 /*
608 * According to section 2.2 of RFC 4429, we must not
609 * send router solicitations with a sllao from
610 * optimistic addresses, but we may send the solicitation
611 * if we don't include the sllao. So here we check
612 * if our address is optimistic, and if so, we
613 * suppress the inclusion of the sllao.
614 */
615 if (send_sllao) {
616 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
617 dev, 1);
618 if (ifp) {
619 if (ifp->flags & IFA_F_OPTIMISTIC) {
620 send_sllao = 0;
621 }
622 in6_ifa_put(ifp);
623 } else {
624 send_sllao = 0;
625 }
626 }
627#endif
628 if (send_sllao)
629 optlen += ndisc_opt_addr_space(dev);
630
631 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
632 if (!skb)
633 return;
634
635 msg = (struct rs_msg *)skb_put(skb, sizeof(*msg));
636 *msg = (struct rs_msg) {
637 .icmph = {
638 .icmp6_type = NDISC_ROUTER_SOLICITATION,
639 },
640 };
641
642 if (send_sllao)
643 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
644 dev->dev_addr);
645
646 ndisc_send_skb(skb, daddr, saddr);
647}
648
649
650static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
651{
652 /*
653 * "The sender MUST return an ICMP
654 * destination unreachable"
655 */
656 dst_link_failure(skb);
657 kfree_skb(skb);
658}
659
660/* Called with locked neigh: either read or both */
661
662static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
663{
664 struct in6_addr *saddr = NULL;
665 struct in6_addr mcaddr;
666 struct net_device *dev = neigh->dev;
667 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
668 int probes = atomic_read(&neigh->probes);
669
670 if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
671 dev, 1,
672 IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
673 saddr = &ipv6_hdr(skb)->saddr;
674 probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
675 if (probes < 0) {
676 if (!(neigh->nud_state & NUD_VALID)) {
677 ND_PRINTK(1, dbg,
678 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
679 __func__, target);
680 }
681 ndisc_send_ns(dev, target, target, saddr);
682 } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
683 neigh_app_ns(neigh);
684 } else {
685 addrconf_addr_solict_mult(target, &mcaddr);
686 ndisc_send_ns(dev, target, &mcaddr, saddr);
687 }
688}
689
690static int pndisc_is_router(const void *pkey,
691 struct net_device *dev)
692{
693 struct pneigh_entry *n;
694 int ret = -1;
695
696 read_lock_bh(&nd_tbl.lock);
697 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
698 if (n)
699 ret = !!(n->flags & NTF_ROUTER);
700 read_unlock_bh(&nd_tbl.lock);
701
702 return ret;
703}
704
705static void ndisc_recv_ns(struct sk_buff *skb)
706{
707 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
708 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
709 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
710 u8 *lladdr = NULL;
711 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
712 offsetof(struct nd_msg, opt));
713 struct ndisc_options ndopts;
714 struct net_device *dev = skb->dev;
715 struct inet6_ifaddr *ifp;
716 struct inet6_dev *idev = NULL;
717 struct neighbour *neigh;
718 int dad = ipv6_addr_any(saddr);
719 bool inc;
720 int is_router = -1;
721
722 if (skb->len < sizeof(struct nd_msg)) {
723 ND_PRINTK(2, warn, "NS: packet too short\n");
724 return;
725 }
726
727 if (ipv6_addr_is_multicast(&msg->target)) {
728 ND_PRINTK(2, warn, "NS: multicast target address\n");
729 return;
730 }
731
732 /*
733 * RFC2461 7.1.1:
734 * DAD has to be destined for solicited node multicast address.
735 */
736 if (dad && !ipv6_addr_is_solict_mult(daddr)) {
737 ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
738 return;
739 }
740
741 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
742 ND_PRINTK(2, warn, "NS: invalid ND options\n");
743 return;
744 }
745
746 if (ndopts.nd_opts_src_lladdr) {
747 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
748 if (!lladdr) {
749 ND_PRINTK(2, warn,
750 "NS: invalid link-layer address length\n");
751 return;
752 }
753
754 /* RFC2461 7.1.1:
755 * If the IP source address is the unspecified address,
756 * there MUST NOT be source link-layer address option
757 * in the message.
758 */
759 if (dad) {
760 ND_PRINTK(2, warn,
761 "NS: bad DAD packet (link-layer address option)\n");
762 return;
763 }
764 }
765
766 inc = ipv6_addr_is_multicast(daddr);
767
768 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
769 if (ifp) {
770have_ifp:
771 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
772 if (dad) {
773 /*
774 * We are colliding with another node
775 * who is doing DAD
776 * so fail our DAD process
777 */
778 addrconf_dad_failure(ifp);
779 return;
780 } else {
781 /*
782 * This is not a dad solicitation.
783 * If we are an optimistic node,
784 * we should respond.
785 * Otherwise, we should ignore it.
786 */
787 if (!(ifp->flags & IFA_F_OPTIMISTIC))
788 goto out;
789 }
790 }
791
792 idev = ifp->idev;
793 } else {
794 struct net *net = dev_net(dev);
795
796 /* perhaps an address on the master device */
797 if (netif_is_l3_slave(dev)) {
798 struct net_device *mdev;
799
800 mdev = netdev_master_upper_dev_get_rcu(dev);
801 if (mdev) {
802 ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1);
803 if (ifp)
804 goto have_ifp;
805 }
806 }
807
808 idev = in6_dev_get(dev);
809 if (!idev) {
810 /* XXX: count this drop? */
811 return;
812 }
813
814 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
815 (idev->cnf.forwarding &&
816 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
817 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
818 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
819 skb->pkt_type != PACKET_HOST &&
820 inc &&
821 NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) {
822 /*
823 * for anycast or proxy,
824 * sender should delay its response
825 * by a random time between 0 and
826 * MAX_ANYCAST_DELAY_TIME seconds.
827 * (RFC2461) -- yoshfuji
828 */
829 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
830 if (n)
831 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
832 goto out;
833 }
834 } else
835 goto out;
836 }
837
838 if (is_router < 0)
839 is_router = idev->cnf.forwarding;
840
841 if (dad) {
842 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
843 !!is_router, false, (ifp != NULL), true);
844 goto out;
845 }
846
847 if (inc)
848 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
849 else
850 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
851
852 /*
853 * update / create cache entry
854 * for the source address
855 */
856 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
857 !inc || lladdr || !dev->addr_len);
858 if (neigh)
859 neigh_update(neigh, lladdr, NUD_STALE,
860 NEIGH_UPDATE_F_WEAK_OVERRIDE|
861 NEIGH_UPDATE_F_OVERRIDE);
862 if (neigh || !dev->header_ops) {
863 ndisc_send_na(dev, saddr, &msg->target, !!is_router,
864 true, (ifp != NULL && inc), inc);
865 if (neigh)
866 neigh_release(neigh);
867 }
868
869out:
870 if (ifp)
871 in6_ifa_put(ifp);
872 else
873 in6_dev_put(idev);
874}
875
876static void ndisc_recv_na(struct sk_buff *skb)
877{
878 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
879 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
880 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
881 u8 *lladdr = NULL;
882 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
883 offsetof(struct nd_msg, opt));
884 struct ndisc_options ndopts;
885 struct net_device *dev = skb->dev;
886 struct inet6_dev *idev = __in6_dev_get(dev);
887 struct inet6_ifaddr *ifp;
888 struct neighbour *neigh;
889
890 if (skb->len < sizeof(struct nd_msg)) {
891 ND_PRINTK(2, warn, "NA: packet too short\n");
892 return;
893 }
894
895 if (ipv6_addr_is_multicast(&msg->target)) {
896 ND_PRINTK(2, warn, "NA: target address is multicast\n");
897 return;
898 }
899
900 if (ipv6_addr_is_multicast(daddr) &&
901 msg->icmph.icmp6_solicited) {
902 ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
903 return;
904 }
905
906 /* For some 802.11 wireless deployments (and possibly other networks),
907 * there will be a NA proxy and unsolicitd packets are attacks
908 * and thus should not be accepted.
909 */
910 if (!msg->icmph.icmp6_solicited && idev &&
911 idev->cnf.drop_unsolicited_na)
912 return;
913
914 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
915 ND_PRINTK(2, warn, "NS: invalid ND option\n");
916 return;
917 }
918 if (ndopts.nd_opts_tgt_lladdr) {
919 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
920 if (!lladdr) {
921 ND_PRINTK(2, warn,
922 "NA: invalid link-layer address length\n");
923 return;
924 }
925 }
926 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
927 if (ifp) {
928 if (skb->pkt_type != PACKET_LOOPBACK
929 && (ifp->flags & IFA_F_TENTATIVE)) {
930 addrconf_dad_failure(ifp);
931 return;
932 }
933 /* What should we make now? The advertisement
934 is invalid, but ndisc specs say nothing
935 about it. It could be misconfiguration, or
936 an smart proxy agent tries to help us :-)
937
938 We should not print the error if NA has been
939 received from loopback - it is just our own
940 unsolicited advertisement.
941 */
942 if (skb->pkt_type != PACKET_LOOPBACK)
943 ND_PRINTK(1, warn,
944 "NA: someone advertises our address %pI6 on %s!\n",
945 &ifp->addr, ifp->idev->dev->name);
946 in6_ifa_put(ifp);
947 return;
948 }
949 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
950
951 if (neigh) {
952 u8 old_flags = neigh->flags;
953 struct net *net = dev_net(dev);
954
955 if (neigh->nud_state & NUD_FAILED)
956 goto out;
957
958 /*
959 * Don't update the neighbor cache entry on a proxy NA from
960 * ourselves because either the proxied node is off link or it
961 * has already sent a NA to us.
962 */
963 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
964 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
965 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
966 /* XXX: idev->cnf.proxy_ndp */
967 goto out;
968 }
969
970 neigh_update(neigh, lladdr,
971 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
972 NEIGH_UPDATE_F_WEAK_OVERRIDE|
973 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
974 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
975 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
976
977 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
978 /*
979 * Change: router to host
980 */
981 rt6_clean_tohost(dev_net(dev), saddr);
982 }
983
984out:
985 neigh_release(neigh);
986 }
987}
988
989static void ndisc_recv_rs(struct sk_buff *skb)
990{
991 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
992 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
993 struct neighbour *neigh;
994 struct inet6_dev *idev;
995 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
996 struct ndisc_options ndopts;
997 u8 *lladdr = NULL;
998
999 if (skb->len < sizeof(*rs_msg))
1000 return;
1001
1002 idev = __in6_dev_get(skb->dev);
1003 if (!idev) {
1004 ND_PRINTK(1, err, "RS: can't find in6 device\n");
1005 return;
1006 }
1007
1008 /* Don't accept RS if we're not in router mode */
1009 if (!idev->cnf.forwarding)
1010 goto out;
1011
1012 /*
1013 * Don't update NCE if src = ::;
1014 * this implies that the source node has no ip address assigned yet.
1015 */
1016 if (ipv6_addr_any(saddr))
1017 goto out;
1018
1019 /* Parse ND options */
1020 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1021 ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
1022 goto out;
1023 }
1024
1025 if (ndopts.nd_opts_src_lladdr) {
1026 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1027 skb->dev);
1028 if (!lladdr)
1029 goto out;
1030 }
1031
1032 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1033 if (neigh) {
1034 neigh_update(neigh, lladdr, NUD_STALE,
1035 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1036 NEIGH_UPDATE_F_OVERRIDE|
1037 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1038 neigh_release(neigh);
1039 }
1040out:
1041 return;
1042}
1043
1044static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1045{
1046 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1047 struct sk_buff *skb;
1048 struct nlmsghdr *nlh;
1049 struct nduseroptmsg *ndmsg;
1050 struct net *net = dev_net(ra->dev);
1051 int err;
1052 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1053 + (opt->nd_opt_len << 3));
1054 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1055
1056 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1057 if (!skb) {
1058 err = -ENOBUFS;
1059 goto errout;
1060 }
1061
1062 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1063 if (!nlh) {
1064 goto nla_put_failure;
1065 }
1066
1067 ndmsg = nlmsg_data(nlh);
1068 ndmsg->nduseropt_family = AF_INET6;
1069 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1070 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1071 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1072 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1073
1074 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1075
1076 if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))
1077 goto nla_put_failure;
1078 nlmsg_end(skb, nlh);
1079
1080 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
1081 return;
1082
1083nla_put_failure:
1084 nlmsg_free(skb);
1085 err = -EMSGSIZE;
1086errout:
1087 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1088}
1089
1090static void ndisc_router_discovery(struct sk_buff *skb)
1091{
1092 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1093 struct neighbour *neigh = NULL;
1094 struct inet6_dev *in6_dev;
1095 struct rt6_info *rt = NULL;
1096 int lifetime;
1097 struct ndisc_options ndopts;
1098 int optlen;
1099 unsigned int pref = 0;
1100 __u32 old_if_flags;
1101 bool send_ifinfo_notify = false;
1102
1103 __u8 *opt = (__u8 *)(ra_msg + 1);
1104
1105 optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
1106 sizeof(struct ra_msg);
1107
1108 ND_PRINTK(2, info,
1109 "RA: %s, dev: %s\n",
1110 __func__, skb->dev->name);
1111 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1112 ND_PRINTK(2, warn, "RA: source address is not link-local\n");
1113 return;
1114 }
1115 if (optlen < 0) {
1116 ND_PRINTK(2, warn, "RA: packet too short\n");
1117 return;
1118 }
1119
1120#ifdef CONFIG_IPV6_NDISC_NODETYPE
1121 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1122 ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
1123 return;
1124 }
1125#endif
1126
1127 /*
1128 * set the RA_RECV flag in the interface
1129 */
1130
1131 in6_dev = __in6_dev_get(skb->dev);
1132 if (!in6_dev) {
1133 ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
1134 skb->dev->name);
1135 return;
1136 }
1137
1138 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1139 ND_PRINTK(2, warn, "RA: invalid ND options\n");
1140 return;
1141 }
1142
1143 if (!ipv6_accept_ra(in6_dev)) {
1144 ND_PRINTK(2, info,
1145 "RA: %s, did not accept ra for dev: %s\n",
1146 __func__, skb->dev->name);
1147 goto skip_linkparms;
1148 }
1149
1150#ifdef CONFIG_IPV6_NDISC_NODETYPE
1151 /* skip link-specific parameters from interior routers */
1152 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1153 ND_PRINTK(2, info,
1154 "RA: %s, nodetype is NODEFAULT, dev: %s\n",
1155 __func__, skb->dev->name);
1156 goto skip_linkparms;
1157 }
1158#endif
1159
1160 if (in6_dev->if_flags & IF_RS_SENT) {
1161 /*
1162 * flag that an RA was received after an RS was sent
1163 * out on this interface.
1164 */
1165 in6_dev->if_flags |= IF_RA_RCVD;
1166 }
1167
1168 /*
1169 * Remember the managed/otherconf flags from most recently
1170 * received RA message (RFC 2462) -- yoshfuji
1171 */
1172 old_if_flags = in6_dev->if_flags;
1173 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1174 IF_RA_OTHERCONF)) |
1175 (ra_msg->icmph.icmp6_addrconf_managed ?
1176 IF_RA_MANAGED : 0) |
1177 (ra_msg->icmph.icmp6_addrconf_other ?
1178 IF_RA_OTHERCONF : 0);
1179
1180 if (old_if_flags != in6_dev->if_flags)
1181 send_ifinfo_notify = true;
1182
1183 if (!in6_dev->cnf.accept_ra_defrtr) {
1184 ND_PRINTK(2, info,
1185 "RA: %s, defrtr is false for dev: %s\n",
1186 __func__, skb->dev->name);
1187 goto skip_defrtr;
1188 }
1189
1190 /* Do not accept RA with source-addr found on local machine unless
1191 * accept_ra_from_local is set to true.
1192 */
1193 if (!in6_dev->cnf.accept_ra_from_local &&
1194 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
1195 in6_dev->dev, 0)) {
1196 ND_PRINTK(2, info,
1197 "RA from local address detected on dev: %s: default router ignored\n",
1198 skb->dev->name);
1199 goto skip_defrtr;
1200 }
1201
1202 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1203
1204#ifdef CONFIG_IPV6_ROUTER_PREF
1205 pref = ra_msg->icmph.icmp6_router_pref;
1206 /* 10b is handled as if it were 00b (medium) */
1207 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1208 !in6_dev->cnf.accept_ra_rtr_pref)
1209 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1210#endif
1211
1212 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1213
1214 if (rt) {
1215 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
1216 if (!neigh) {
1217 ND_PRINTK(0, err,
1218 "RA: %s got default router without neighbour\n",
1219 __func__);
1220 ip6_rt_put(rt);
1221 return;
1222 }
1223 }
1224 if (rt && lifetime == 0) {
1225 ip6_del_rt(rt);
1226 rt = NULL;
1227 }
1228
1229 ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n",
1230 rt, lifetime, skb->dev->name);
1231 if (!rt && lifetime) {
1232 ND_PRINTK(3, info, "RA: adding default router\n");
1233
1234 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1235 if (!rt) {
1236 ND_PRINTK(0, err,
1237 "RA: %s failed to add default route\n",
1238 __func__);
1239 return;
1240 }
1241
1242 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
1243 if (!neigh) {
1244 ND_PRINTK(0, err,
1245 "RA: %s got default router without neighbour\n",
1246 __func__);
1247 ip6_rt_put(rt);
1248 return;
1249 }
1250 neigh->flags |= NTF_ROUTER;
1251 } else if (rt) {
1252 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1253 }
1254
1255 if (rt)
1256 rt6_set_expires(rt, jiffies + (HZ * lifetime));
1257 if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
1258 ra_msg->icmph.icmp6_hop_limit) {
1259 if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
1260 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1261 if (rt)
1262 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1263 ra_msg->icmph.icmp6_hop_limit);
1264 } else {
1265 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
1266 }
1267 }
1268
1269skip_defrtr:
1270
1271 /*
1272 * Update Reachable Time and Retrans Timer
1273 */
1274
1275 if (in6_dev->nd_parms) {
1276 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1277
1278 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1279 rtime = (rtime*HZ)/1000;
1280 if (rtime < HZ/10)
1281 rtime = HZ/10;
1282 NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
1283 in6_dev->tstamp = jiffies;
1284 send_ifinfo_notify = true;
1285 }
1286
1287 rtime = ntohl(ra_msg->reachable_time);
1288 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1289 rtime = (rtime*HZ)/1000;
1290
1291 if (rtime < HZ/10)
1292 rtime = HZ/10;
1293
1294 if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) {
1295 NEIGH_VAR_SET(in6_dev->nd_parms,
1296 BASE_REACHABLE_TIME, rtime);
1297 NEIGH_VAR_SET(in6_dev->nd_parms,
1298 GC_STALETIME, 3 * rtime);
1299 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1300 in6_dev->tstamp = jiffies;
1301 send_ifinfo_notify = true;
1302 }
1303 }
1304 }
1305
1306 /*
1307 * Send a notify if RA changed managed/otherconf flags or timer settings
1308 */
1309 if (send_ifinfo_notify)
1310 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1311
1312skip_linkparms:
1313
1314 /*
1315 * Process options.
1316 */
1317
1318 if (!neigh)
1319 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1320 skb->dev, 1);
1321 if (neigh) {
1322 u8 *lladdr = NULL;
1323 if (ndopts.nd_opts_src_lladdr) {
1324 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1325 skb->dev);
1326 if (!lladdr) {
1327 ND_PRINTK(2, warn,
1328 "RA: invalid link-layer address length\n");
1329 goto out;
1330 }
1331 }
1332 neigh_update(neigh, lladdr, NUD_STALE,
1333 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1334 NEIGH_UPDATE_F_OVERRIDE|
1335 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1336 NEIGH_UPDATE_F_ISROUTER);
1337 }
1338
1339 if (!ipv6_accept_ra(in6_dev)) {
1340 ND_PRINTK(2, info,
1341 "RA: %s, accept_ra is false for dev: %s\n",
1342 __func__, skb->dev->name);
1343 goto out;
1344 }
1345
1346#ifdef CONFIG_IPV6_ROUTE_INFO
1347 if (!in6_dev->cnf.accept_ra_from_local &&
1348 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
1349 in6_dev->dev, 0)) {
1350 ND_PRINTK(2, info,
1351 "RA from local address detected on dev: %s: router info ignored.\n",
1352 skb->dev->name);
1353 goto skip_routeinfo;
1354 }
1355
1356 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1357 struct nd_opt_hdr *p;
1358 for (p = ndopts.nd_opts_ri;
1359 p;
1360 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1361 struct route_info *ri = (struct route_info *)p;
1362#ifdef CONFIG_IPV6_NDISC_NODETYPE
1363 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1364 ri->prefix_len == 0)
1365 continue;
1366#endif
1367 if (ri->prefix_len == 0 &&
1368 !in6_dev->cnf.accept_ra_defrtr)
1369 continue;
1370 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1371 continue;
1372 rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,
1373 &ipv6_hdr(skb)->saddr);
1374 }
1375 }
1376
1377skip_routeinfo:
1378#endif
1379
1380#ifdef CONFIG_IPV6_NDISC_NODETYPE
1381 /* skip link-specific ndopts from interior routers */
1382 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1383 ND_PRINTK(2, info,
1384 "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
1385 __func__, skb->dev->name);
1386 goto out;
1387 }
1388#endif
1389
1390 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1391 struct nd_opt_hdr *p;
1392 for (p = ndopts.nd_opts_pi;
1393 p;
1394 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1395 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1396 (p->nd_opt_len) << 3,
1397 ndopts.nd_opts_src_lladdr != NULL);
1398 }
1399 }
1400
1401 if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) {
1402 __be32 n;
1403 u32 mtu;
1404
1405 memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1406 mtu = ntohl(n);
1407
1408 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1409 ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
1410 } else if (in6_dev->cnf.mtu6 != mtu) {
1411 in6_dev->cnf.mtu6 = mtu;
1412
1413 if (rt)
1414 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
1415
1416 rt6_mtu_change(skb->dev, mtu);
1417 }
1418 }
1419
1420 if (ndopts.nd_useropts) {
1421 struct nd_opt_hdr *p;
1422 for (p = ndopts.nd_useropts;
1423 p;
1424 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1425 ndisc_ra_useropt(skb, p);
1426 }
1427 }
1428
1429 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1430 ND_PRINTK(2, warn, "RA: invalid RA options\n");
1431 }
1432out:
1433 ip6_rt_put(rt);
1434 if (neigh)
1435 neigh_release(neigh);
1436}
1437
1438static void ndisc_redirect_rcv(struct sk_buff *skb)
1439{
1440 u8 *hdr;
1441 struct ndisc_options ndopts;
1442 struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
1443 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
1444 offsetof(struct rd_msg, opt));
1445
1446#ifdef CONFIG_IPV6_NDISC_NODETYPE
1447 switch (skb->ndisc_nodetype) {
1448 case NDISC_NODETYPE_HOST:
1449 case NDISC_NODETYPE_NODEFAULT:
1450 ND_PRINTK(2, warn,
1451 "Redirect: from host or unauthorized router\n");
1452 return;
1453 }
1454#endif
1455
1456 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1457 ND_PRINTK(2, warn,
1458 "Redirect: source address is not link-local\n");
1459 return;
1460 }
1461
1462 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
1463 return;
1464
1465 if (!ndopts.nd_opts_rh) {
1466 ip6_redirect_no_header(skb, dev_net(skb->dev),
1467 skb->dev->ifindex, 0);
1468 return;
1469 }
1470
1471 hdr = (u8 *)ndopts.nd_opts_rh;
1472 hdr += 8;
1473 if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
1474 return;
1475
1476 icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
1477}
1478
1479static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
1480 struct sk_buff *orig_skb,
1481 int rd_len)
1482{
1483 u8 *opt = skb_put(skb, rd_len);
1484
1485 memset(opt, 0, 8);
1486 *(opt++) = ND_OPT_REDIRECT_HDR;
1487 *(opt++) = (rd_len >> 3);
1488 opt += 6;
1489
1490 memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8);
1491}
1492
1493void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
1494{
1495 struct net_device *dev = skb->dev;
1496 struct net *net = dev_net(dev);
1497 struct sock *sk = net->ipv6.ndisc_sk;
1498 int optlen = 0;
1499 struct inet_peer *peer;
1500 struct sk_buff *buff;
1501 struct rd_msg *msg;
1502 struct in6_addr saddr_buf;
1503 struct rt6_info *rt;
1504 struct dst_entry *dst;
1505 struct flowi6 fl6;
1506 int rd_len;
1507 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1508 int oif = l3mdev_fib_oif(dev);
1509 bool ret;
1510
1511 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1512 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
1513 dev->name);
1514 return;
1515 }
1516
1517 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1518 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1519 ND_PRINTK(2, warn,
1520 "Redirect: target address is not link-local unicast\n");
1521 return;
1522 }
1523
1524 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
1525 &saddr_buf, &ipv6_hdr(skb)->saddr, oif);
1526
1527 if (oif != skb->dev->ifindex)
1528 fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC;
1529
1530 dst = ip6_route_output(net, NULL, &fl6);
1531 if (dst->error) {
1532 dst_release(dst);
1533 return;
1534 }
1535 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1536 if (IS_ERR(dst))
1537 return;
1538
1539 rt = (struct rt6_info *) dst;
1540
1541 if (rt->rt6i_flags & RTF_GATEWAY) {
1542 ND_PRINTK(2, warn,
1543 "Redirect: destination is not a neighbour\n");
1544 goto release;
1545 }
1546 peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1);
1547 ret = inet_peer_xrlim_allow(peer, 1*HZ);
1548 if (peer)
1549 inet_putpeer(peer);
1550 if (!ret)
1551 goto release;
1552
1553 if (dev->addr_len) {
1554 struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
1555 if (!neigh) {
1556 ND_PRINTK(2, warn,
1557 "Redirect: no neigh for target address\n");
1558 goto release;
1559 }
1560
1561 read_lock_bh(&neigh->lock);
1562 if (neigh->nud_state & NUD_VALID) {
1563 memcpy(ha_buf, neigh->ha, dev->addr_len);
1564 read_unlock_bh(&neigh->lock);
1565 ha = ha_buf;
1566 optlen += ndisc_opt_addr_space(dev);
1567 } else
1568 read_unlock_bh(&neigh->lock);
1569
1570 neigh_release(neigh);
1571 }
1572
1573 rd_len = min_t(unsigned int,
1574 IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
1575 skb->len + 8);
1576 rd_len &= ~0x7;
1577 optlen += rd_len;
1578
1579 buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
1580 if (!buff)
1581 goto release;
1582
1583 msg = (struct rd_msg *)skb_put(buff, sizeof(*msg));
1584 *msg = (struct rd_msg) {
1585 .icmph = {
1586 .icmp6_type = NDISC_REDIRECT,
1587 },
1588 .target = *target,
1589 .dest = ipv6_hdr(skb)->daddr,
1590 };
1591
1592 /*
1593 * include target_address option
1594 */
1595
1596 if (ha)
1597 ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha);
1598
1599 /*
1600 * build redirect option and copy skb over to the new packet.
1601 */
1602
1603 if (rd_len)
1604 ndisc_fill_redirect_hdr_option(buff, skb, rd_len);
1605
1606 skb_dst_set(buff, dst);
1607 ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
1608 return;
1609
1610release:
1611 dst_release(dst);
1612}
1613
1614static void pndisc_redo(struct sk_buff *skb)
1615{
1616 ndisc_recv_ns(skb);
1617 kfree_skb(skb);
1618}
1619
1620static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
1621{
1622 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1623
1624 if (!idev)
1625 return true;
1626 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
1627 idev->cnf.suppress_frag_ndisc) {
1628 net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
1629 return true;
1630 }
1631 return false;
1632}
1633
1634int ndisc_rcv(struct sk_buff *skb)
1635{
1636 struct nd_msg *msg;
1637
1638 if (ndisc_suppress_frag_ndisc(skb))
1639 return 0;
1640
1641 if (skb_linearize(skb))
1642 return 0;
1643
1644 msg = (struct nd_msg *)skb_transport_header(skb);
1645
1646 __skb_push(skb, skb->data - skb_transport_header(skb));
1647
1648 if (ipv6_hdr(skb)->hop_limit != 255) {
1649 ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
1650 ipv6_hdr(skb)->hop_limit);
1651 return 0;
1652 }
1653
1654 if (msg->icmph.icmp6_code != 0) {
1655 ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
1656 msg->icmph.icmp6_code);
1657 return 0;
1658 }
1659
1660 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1661
1662 switch (msg->icmph.icmp6_type) {
1663 case NDISC_NEIGHBOUR_SOLICITATION:
1664 ndisc_recv_ns(skb);
1665 break;
1666
1667 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1668 ndisc_recv_na(skb);
1669 break;
1670
1671 case NDISC_ROUTER_SOLICITATION:
1672 ndisc_recv_rs(skb);
1673 break;
1674
1675 case NDISC_ROUTER_ADVERTISEMENT:
1676 ndisc_router_discovery(skb);
1677 break;
1678
1679 case NDISC_REDIRECT:
1680 ndisc_redirect_rcv(skb);
1681 break;
1682 }
1683
1684 return 0;
1685}
1686
1687static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1688{
1689 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1690 struct netdev_notifier_change_info *change_info;
1691 struct net *net = dev_net(dev);
1692 struct inet6_dev *idev;
1693
1694 switch (event) {
1695 case NETDEV_CHANGEADDR:
1696 neigh_changeaddr(&nd_tbl, dev);
1697 fib6_run_gc(0, net, false);
1698 idev = in6_dev_get(dev);
1699 if (!idev)
1700 break;
1701 if (idev->cnf.ndisc_notify)
1702 ndisc_send_unsol_na(dev);
1703 in6_dev_put(idev);
1704 break;
1705 case NETDEV_CHANGE:
1706 change_info = ptr;
1707 if (change_info->flags_changed & IFF_NOARP)
1708 neigh_changeaddr(&nd_tbl, dev);
1709 break;
1710 case NETDEV_DOWN:
1711 neigh_ifdown(&nd_tbl, dev);
1712 fib6_run_gc(0, net, false);
1713 break;
1714 case NETDEV_NOTIFY_PEERS:
1715 ndisc_send_unsol_na(dev);
1716 break;
1717 default:
1718 break;
1719 }
1720
1721 return NOTIFY_DONE;
1722}
1723
1724static struct notifier_block ndisc_netdev_notifier = {
1725 .notifier_call = ndisc_netdev_event,
1726};
1727
1728#ifdef CONFIG_SYSCTL
1729static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1730 const char *func, const char *dev_name)
1731{
1732 static char warncomm[TASK_COMM_LEN];
1733 static int warned;
1734 if (strcmp(warncomm, current->comm) && warned < 5) {
1735 strcpy(warncomm, current->comm);
1736 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
1737 warncomm, func,
1738 dev_name, ctl->procname,
1739 dev_name, ctl->procname);
1740 warned++;
1741 }
1742}
1743
1744int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
1745{
1746 struct net_device *dev = ctl->extra1;
1747 struct inet6_dev *idev;
1748 int ret;
1749
1750 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1751 (strcmp(ctl->procname, "base_reachable_time") == 0))
1752 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1753
1754 if (strcmp(ctl->procname, "retrans_time") == 0)
1755 ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);
1756
1757 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1758 ret = neigh_proc_dointvec_jiffies(ctl, write,
1759 buffer, lenp, ppos);
1760
1761 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1762 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1763 ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
1764 buffer, lenp, ppos);
1765 else
1766 ret = -1;
1767
1768 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1769 if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
1770 idev->nd_parms->reachable_time =
1771 neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
1772 idev->tstamp = jiffies;
1773 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1774 in6_dev_put(idev);
1775 }
1776 return ret;
1777}
1778
1779
1780#endif
1781
1782static int __net_init ndisc_net_init(struct net *net)
1783{
1784 struct ipv6_pinfo *np;
1785 struct sock *sk;
1786 int err;
1787
1788 err = inet_ctl_sock_create(&sk, PF_INET6,
1789 SOCK_RAW, IPPROTO_ICMPV6, net);
1790 if (err < 0) {
1791 ND_PRINTK(0, err,
1792 "NDISC: Failed to initialize the control socket (err %d)\n",
1793 err);
1794 return err;
1795 }
1796
1797 net->ipv6.ndisc_sk = sk;
1798
1799 np = inet6_sk(sk);
1800 np->hop_limit = 255;
1801 /* Do not loopback ndisc messages */
1802 np->mc_loop = 0;
1803
1804 return 0;
1805}
1806
1807static void __net_exit ndisc_net_exit(struct net *net)
1808{
1809 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1810}
1811
1812static struct pernet_operations ndisc_net_ops = {
1813 .init = ndisc_net_init,
1814 .exit = ndisc_net_exit,
1815};
1816
1817int __init ndisc_init(void)
1818{
1819 int err;
1820
1821 err = register_pernet_subsys(&ndisc_net_ops);
1822 if (err)
1823 return err;
1824 /*
1825 * Initialize the neighbour table
1826 */
1827 neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
1828
1829#ifdef CONFIG_SYSCTL
1830 err = neigh_sysctl_register(NULL, &nd_tbl.parms,
1831 ndisc_ifinfo_sysctl_change);
1832 if (err)
1833 goto out_unregister_pernet;
1834out:
1835#endif
1836 return err;
1837
1838#ifdef CONFIG_SYSCTL
1839out_unregister_pernet:
1840 unregister_pernet_subsys(&ndisc_net_ops);
1841 goto out;
1842#endif
1843}
1844
1845int __init ndisc_late_init(void)
1846{
1847 return register_netdevice_notifier(&ndisc_netdev_notifier);
1848}
1849
1850void ndisc_late_cleanup(void)
1851{
1852 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1853}
1854
1855void ndisc_cleanup(void)
1856{
1857#ifdef CONFIG_SYSCTL
1858 neigh_sysctl_unregister(&nd_tbl.parms);
1859#endif
1860 neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
1861 unregister_pernet_subsys(&ndisc_net_ops);
1862}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Neighbour Discovery for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Mike Shaver <shaver@ingenia.com>
9 */
10
11/*
12 * Changes:
13 *
14 * Alexey I. Froloff : RFC6106 (DNSSL) support
15 * Pierre Ynard : export userland ND options
16 * through netlink (RDNSS support)
17 * Lars Fenneberg : fixed MTU setting on receipt
18 * of an RA.
19 * Janos Farkas : kmalloc failure checks
20 * Alexey Kuznetsov : state machine reworked
21 * and moved to net/core.
22 * Pekka Savola : RFC2461 validation
23 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
24 */
25
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);
84static int ndisc_is_multicast(const void *pkey);
85
86static const struct neigh_ops ndisc_generic_ops = {
87 .family = AF_INET6,
88 .solicit = ndisc_solicit,
89 .error_report = ndisc_error_report,
90 .output = neigh_resolve_output,
91 .connected_output = neigh_connected_output,
92};
93
94static const struct neigh_ops ndisc_hh_ops = {
95 .family = AF_INET6,
96 .solicit = ndisc_solicit,
97 .error_report = ndisc_error_report,
98 .output = neigh_resolve_output,
99 .connected_output = neigh_resolve_output,
100};
101
102
103static const struct neigh_ops ndisc_direct_ops = {
104 .family = AF_INET6,
105 .output = neigh_direct_output,
106 .connected_output = neigh_direct_output,
107};
108
109struct neigh_table nd_tbl = {
110 .family = AF_INET6,
111 .key_len = sizeof(struct in6_addr),
112 .protocol = cpu_to_be16(ETH_P_IPV6),
113 .hash = ndisc_hash,
114 .key_eq = ndisc_key_eq,
115 .constructor = ndisc_constructor,
116 .pconstructor = pndisc_constructor,
117 .pdestructor = pndisc_destructor,
118 .proxy_redo = pndisc_redo,
119 .is_multicast = ndisc_is_multicast,
120 .allow_add = ndisc_allow_add,
121 .id = "ndisc_cache",
122 .parms = {
123 .tbl = &nd_tbl,
124 .reachable_time = ND_REACHABLE_TIME,
125 .data = {
126 [NEIGH_VAR_MCAST_PROBES] = 3,
127 [NEIGH_VAR_UCAST_PROBES] = 3,
128 [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
129 [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
130 [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
131 [NEIGH_VAR_INTERVAL_PROBE_TIME_MS] = 5 * HZ,
132 [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
133 [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
134 [NEIGH_VAR_PROXY_QLEN] = 64,
135 [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
136 [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
137 },
138 },
139 .gc_interval = 30 * HZ,
140 .gc_thresh1 = 128,
141 .gc_thresh2 = 512,
142 .gc_thresh3 = 1024,
143};
144EXPORT_SYMBOL_GPL(nd_tbl);
145
146void __ndisc_fill_addr_option(struct sk_buff *skb, int type, const void *data,
147 int data_len, int pad)
148{
149 int space = __ndisc_opt_addr_space(data_len, pad);
150 u8 *opt = skb_put(skb, space);
151
152 opt[0] = type;
153 opt[1] = space>>3;
154
155 memset(opt + 2, 0, pad);
156 opt += pad;
157 space -= pad;
158
159 memcpy(opt+2, data, data_len);
160 data_len += 2;
161 opt += data_len;
162 space -= data_len;
163 if (space > 0)
164 memset(opt, 0, space);
165}
166EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
167
168static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
169 const void *data, u8 icmp6_type)
170{
171 __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
172 ndisc_addr_option_pad(skb->dev->type));
173 ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type);
174}
175
176static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb,
177 void *ha,
178 const u8 *ops_data)
179{
180 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT);
181 ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data);
182}
183
184static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
185 struct nd_opt_hdr *end)
186{
187 int type;
188 if (!cur || !end || cur >= end)
189 return NULL;
190 type = cur->nd_opt_type;
191 do {
192 cur = ((void *)cur) + (cur->nd_opt_len << 3);
193 } while (cur < end && cur->nd_opt_type != type);
194 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
195}
196
197static inline int ndisc_is_useropt(const struct net_device *dev,
198 struct nd_opt_hdr *opt)
199{
200 return opt->nd_opt_type == ND_OPT_PREFIX_INFO ||
201 opt->nd_opt_type == ND_OPT_RDNSS ||
202 opt->nd_opt_type == ND_OPT_DNSSL ||
203 opt->nd_opt_type == ND_OPT_6CO ||
204 opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL ||
205 opt->nd_opt_type == ND_OPT_PREF64;
206}
207
208static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
209 struct nd_opt_hdr *cur,
210 struct nd_opt_hdr *end)
211{
212 if (!cur || !end || cur >= end)
213 return NULL;
214 do {
215 cur = ((void *)cur) + (cur->nd_opt_len << 3);
216 } while (cur < end && !ndisc_is_useropt(dev, cur));
217 return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
218}
219
220struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
221 u8 *opt, int opt_len,
222 struct ndisc_options *ndopts)
223{
224 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
225
226 if (!nd_opt || opt_len < 0 || !ndopts)
227 return NULL;
228 memset(ndopts, 0, sizeof(*ndopts));
229 while (opt_len) {
230 bool unknown = false;
231 int l;
232 if (opt_len < sizeof(struct nd_opt_hdr))
233 return NULL;
234 l = nd_opt->nd_opt_len << 3;
235 if (opt_len < l || l == 0)
236 return NULL;
237 if (ndisc_ops_parse_options(dev, nd_opt, ndopts))
238 goto next_opt;
239 switch (nd_opt->nd_opt_type) {
240 case ND_OPT_SOURCE_LL_ADDR:
241 case ND_OPT_TARGET_LL_ADDR:
242 case ND_OPT_MTU:
243 case ND_OPT_NONCE:
244 case ND_OPT_REDIRECT_HDR:
245 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
246 ND_PRINTK(2, warn,
247 "%s: duplicated ND6 option found: type=%d\n",
248 __func__, nd_opt->nd_opt_type);
249 } else {
250 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
251 }
252 break;
253 case ND_OPT_PREFIX_INFO:
254 ndopts->nd_opts_pi_end = nd_opt;
255 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
256 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
257 break;
258#ifdef CONFIG_IPV6_ROUTE_INFO
259 case ND_OPT_ROUTE_INFO:
260 ndopts->nd_opts_ri_end = nd_opt;
261 if (!ndopts->nd_opts_ri)
262 ndopts->nd_opts_ri = nd_opt;
263 break;
264#endif
265 default:
266 unknown = true;
267 }
268 if (ndisc_is_useropt(dev, nd_opt)) {
269 ndopts->nd_useropts_end = nd_opt;
270 if (!ndopts->nd_useropts)
271 ndopts->nd_useropts = nd_opt;
272 } else if (unknown) {
273 /*
274 * Unknown options must be silently ignored,
275 * to accommodate future extension to the
276 * protocol.
277 */
278 ND_PRINTK(2, notice,
279 "%s: ignored unsupported option; type=%d, len=%d\n",
280 __func__,
281 nd_opt->nd_opt_type,
282 nd_opt->nd_opt_len);
283 }
284next_opt:
285 opt_len -= l;
286 nd_opt = ((void *)nd_opt) + l;
287 }
288 return ndopts;
289}
290
291int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
292{
293 switch (dev->type) {
294 case ARPHRD_ETHER:
295 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
296 case ARPHRD_FDDI:
297 ipv6_eth_mc_map(addr, buf);
298 return 0;
299 case ARPHRD_ARCNET:
300 ipv6_arcnet_mc_map(addr, buf);
301 return 0;
302 case ARPHRD_INFINIBAND:
303 ipv6_ib_mc_map(addr, dev->broadcast, buf);
304 return 0;
305 case ARPHRD_IPGRE:
306 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
307 default:
308 if (dir) {
309 memcpy(buf, dev->broadcast, dev->addr_len);
310 return 0;
311 }
312 }
313 return -EINVAL;
314}
315EXPORT_SYMBOL(ndisc_mc_map);
316
317static u32 ndisc_hash(const void *pkey,
318 const struct net_device *dev,
319 __u32 *hash_rnd)
320{
321 return ndisc_hashfn(pkey, dev, hash_rnd);
322}
323
324static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
325{
326 return neigh_key_eq128(n, pkey);
327}
328
329static int ndisc_constructor(struct neighbour *neigh)
330{
331 struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
332 struct net_device *dev = neigh->dev;
333 struct inet6_dev *in6_dev;
334 struct neigh_parms *parms;
335 bool is_multicast = ipv6_addr_is_multicast(addr);
336
337 in6_dev = in6_dev_get(dev);
338 if (!in6_dev) {
339 return -EINVAL;
340 }
341
342 parms = in6_dev->nd_parms;
343 __neigh_parms_put(neigh->parms);
344 neigh->parms = neigh_parms_clone(parms);
345
346 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
347 if (!dev->header_ops) {
348 neigh->nud_state = NUD_NOARP;
349 neigh->ops = &ndisc_direct_ops;
350 neigh->output = neigh_direct_output;
351 } else {
352 if (is_multicast) {
353 neigh->nud_state = NUD_NOARP;
354 ndisc_mc_map(addr, neigh->ha, dev, 1);
355 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
356 neigh->nud_state = NUD_NOARP;
357 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
358 if (dev->flags&IFF_LOOPBACK)
359 neigh->type = RTN_LOCAL;
360 } else if (dev->flags&IFF_POINTOPOINT) {
361 neigh->nud_state = NUD_NOARP;
362 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
363 }
364 if (dev->header_ops->cache)
365 neigh->ops = &ndisc_hh_ops;
366 else
367 neigh->ops = &ndisc_generic_ops;
368 if (neigh->nud_state&NUD_VALID)
369 neigh->output = neigh->ops->connected_output;
370 else
371 neigh->output = neigh->ops->output;
372 }
373 in6_dev_put(in6_dev);
374 return 0;
375}
376
377static int pndisc_constructor(struct pneigh_entry *n)
378{
379 struct in6_addr *addr = (struct in6_addr *)&n->key;
380 struct in6_addr maddr;
381 struct net_device *dev = n->dev;
382
383 if (!dev || !__in6_dev_get(dev))
384 return -EINVAL;
385 addrconf_addr_solict_mult(addr, &maddr);
386 ipv6_dev_mc_inc(dev, &maddr);
387 return 0;
388}
389
390static void pndisc_destructor(struct pneigh_entry *n)
391{
392 struct in6_addr *addr = (struct in6_addr *)&n->key;
393 struct in6_addr maddr;
394 struct net_device *dev = n->dev;
395
396 if (!dev || !__in6_dev_get(dev))
397 return;
398 addrconf_addr_solict_mult(addr, &maddr);
399 ipv6_dev_mc_dec(dev, &maddr);
400}
401
402/* called with rtnl held */
403static bool ndisc_allow_add(const struct net_device *dev,
404 struct netlink_ext_ack *extack)
405{
406 struct inet6_dev *idev = __in6_dev_get(dev);
407
408 if (!idev || idev->cnf.disable_ipv6) {
409 NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
410 return false;
411 }
412
413 return true;
414}
415
416static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
417 int len)
418{
419 int hlen = LL_RESERVED_SPACE(dev);
420 int tlen = dev->needed_tailroom;
421 struct sk_buff *skb;
422
423 skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
424 if (!skb)
425 return NULL;
426
427 skb->protocol = htons(ETH_P_IPV6);
428 skb->dev = dev;
429
430 skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
431 skb_reset_transport_header(skb);
432
433 /* Manually assign socket ownership as we avoid calling
434 * sock_alloc_send_pskb() to bypass wmem buffer limits
435 */
436 rcu_read_lock();
437 skb_set_owner_w(skb, dev_net_rcu(dev)->ipv6.ndisc_sk);
438 rcu_read_unlock();
439
440 return skb;
441}
442
443static void ip6_nd_hdr(struct sk_buff *skb,
444 const struct in6_addr *saddr,
445 const struct in6_addr *daddr,
446 int hop_limit, int len)
447{
448 struct ipv6hdr *hdr;
449 struct inet6_dev *idev;
450 unsigned tclass;
451
452 rcu_read_lock();
453 idev = __in6_dev_get(skb->dev);
454 tclass = idev ? READ_ONCE(idev->cnf.ndisc_tclass) : 0;
455 rcu_read_unlock();
456
457 skb_push(skb, sizeof(*hdr));
458 skb_reset_network_header(skb);
459 hdr = ipv6_hdr(skb);
460
461 ip6_flow_hdr(hdr, tclass, 0);
462
463 hdr->payload_len = htons(len);
464 hdr->nexthdr = IPPROTO_ICMPV6;
465 hdr->hop_limit = hop_limit;
466
467 hdr->saddr = *saddr;
468 hdr->daddr = *daddr;
469}
470
471void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr,
472 const struct in6_addr *saddr)
473{
474 struct icmp6hdr *icmp6h = icmp6_hdr(skb);
475 struct dst_entry *dst = skb_dst(skb);
476 struct inet6_dev *idev;
477 struct net *net;
478 struct sock *sk;
479 int err;
480 u8 type;
481
482 type = icmp6h->icmp6_type;
483
484 rcu_read_lock();
485
486 net = dev_net_rcu(skb->dev);
487 sk = net->ipv6.ndisc_sk;
488 if (!dst) {
489 struct flowi6 fl6;
490 int oif = skb->dev->ifindex;
491
492 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
493 dst = icmp6_dst_alloc(skb->dev, &fl6);
494 if (IS_ERR(dst)) {
495 rcu_read_unlock();
496 kfree_skb(skb);
497 return;
498 }
499
500 skb_dst_set(skb, dst);
501 }
502
503 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
504 IPPROTO_ICMPV6,
505 csum_partial(icmp6h,
506 skb->len, 0));
507
508 ip6_nd_hdr(skb, saddr, daddr, READ_ONCE(inet6_sk(sk)->hop_limit), skb->len);
509
510 idev = __in6_dev_get(dst->dev);
511 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
512
513 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
514 net, sk, skb, NULL, dst->dev,
515 dst_output);
516 if (!err) {
517 ICMP6MSGOUT_INC_STATS(net, idev, type);
518 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
519 }
520
521 rcu_read_unlock();
522}
523EXPORT_SYMBOL(ndisc_send_skb);
524
525void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
526 const struct in6_addr *solicited_addr,
527 bool router, bool solicited, bool override, bool inc_opt)
528{
529 struct sk_buff *skb;
530 struct in6_addr tmpaddr;
531 struct inet6_ifaddr *ifp;
532 const struct in6_addr *src_addr;
533 struct nd_msg *msg;
534 int optlen = 0;
535
536 /* for anycast or proxy, solicited_addr != src_addr */
537 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
538 if (ifp) {
539 src_addr = solicited_addr;
540 if (ifp->flags & IFA_F_OPTIMISTIC)
541 override = false;
542 inc_opt |= READ_ONCE(ifp->idev->cnf.force_tllao);
543 in6_ifa_put(ifp);
544 } else {
545 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
546 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
547 &tmpaddr))
548 return;
549 src_addr = &tmpaddr;
550 }
551
552 if (!dev->addr_len)
553 inc_opt = false;
554 if (inc_opt)
555 optlen += ndisc_opt_addr_space(dev,
556 NDISC_NEIGHBOUR_ADVERTISEMENT);
557
558 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
559 if (!skb)
560 return;
561
562 msg = skb_put(skb, sizeof(*msg));
563 *msg = (struct nd_msg) {
564 .icmph = {
565 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
566 .icmp6_router = router,
567 .icmp6_solicited = solicited,
568 .icmp6_override = override,
569 },
570 .target = *solicited_addr,
571 };
572
573 if (inc_opt)
574 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
575 dev->dev_addr,
576 NDISC_NEIGHBOUR_ADVERTISEMENT);
577
578 ndisc_send_skb(skb, daddr, src_addr);
579}
580
581static void ndisc_send_unsol_na(struct net_device *dev)
582{
583 struct inet6_dev *idev;
584 struct inet6_ifaddr *ifa;
585
586 idev = in6_dev_get(dev);
587 if (!idev)
588 return;
589
590 read_lock_bh(&idev->lock);
591 list_for_each_entry(ifa, &idev->addr_list, if_list) {
592 /* skip tentative addresses until dad completes */
593 if (ifa->flags & IFA_F_TENTATIVE &&
594 !(ifa->flags & IFA_F_OPTIMISTIC))
595 continue;
596
597 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
598 /*router=*/ !!idev->cnf.forwarding,
599 /*solicited=*/ false, /*override=*/ true,
600 /*inc_opt=*/ true);
601 }
602 read_unlock_bh(&idev->lock);
603
604 in6_dev_put(idev);
605}
606
607struct sk_buff *ndisc_ns_create(struct net_device *dev, const struct in6_addr *solicit,
608 const struct in6_addr *saddr, u64 nonce)
609{
610 int inc_opt = dev->addr_len;
611 struct sk_buff *skb;
612 struct nd_msg *msg;
613 int optlen = 0;
614
615 if (!saddr)
616 return NULL;
617
618 if (ipv6_addr_any(saddr))
619 inc_opt = false;
620 if (inc_opt)
621 optlen += ndisc_opt_addr_space(dev,
622 NDISC_NEIGHBOUR_SOLICITATION);
623 if (nonce != 0)
624 optlen += 8;
625
626 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
627 if (!skb)
628 return NULL;
629
630 msg = skb_put(skb, sizeof(*msg));
631 *msg = (struct nd_msg) {
632 .icmph = {
633 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
634 },
635 .target = *solicit,
636 };
637
638 if (inc_opt)
639 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
640 dev->dev_addr,
641 NDISC_NEIGHBOUR_SOLICITATION);
642 if (nonce != 0) {
643 u8 *opt = skb_put(skb, 8);
644
645 opt[0] = ND_OPT_NONCE;
646 opt[1] = 8 >> 3;
647 memcpy(opt + 2, &nonce, 6);
648 }
649
650 return skb;
651}
652EXPORT_SYMBOL(ndisc_ns_create);
653
654void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
655 const struct in6_addr *daddr, const struct in6_addr *saddr,
656 u64 nonce)
657{
658 struct in6_addr addr_buf;
659 struct sk_buff *skb;
660
661 if (!saddr) {
662 if (ipv6_get_lladdr(dev, &addr_buf,
663 (IFA_F_TENTATIVE | IFA_F_OPTIMISTIC)))
664 return;
665 saddr = &addr_buf;
666 }
667
668 skb = ndisc_ns_create(dev, solicit, saddr, nonce);
669
670 if (skb)
671 ndisc_send_skb(skb, daddr, saddr);
672}
673
674void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
675 const struct in6_addr *daddr)
676{
677 struct sk_buff *skb;
678 struct rs_msg *msg;
679 int send_sllao = dev->addr_len;
680 int optlen = 0;
681
682#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
683 /*
684 * According to section 2.2 of RFC 4429, we must not
685 * send router solicitations with a sllao from
686 * optimistic addresses, but we may send the solicitation
687 * if we don't include the sllao. So here we check
688 * if our address is optimistic, and if so, we
689 * suppress the inclusion of the sllao.
690 */
691 if (send_sllao) {
692 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
693 dev, 1);
694 if (ifp) {
695 if (ifp->flags & IFA_F_OPTIMISTIC) {
696 send_sllao = 0;
697 }
698 in6_ifa_put(ifp);
699 } else {
700 send_sllao = 0;
701 }
702 }
703#endif
704 if (send_sllao)
705 optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION);
706
707 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
708 if (!skb)
709 return;
710
711 msg = skb_put(skb, sizeof(*msg));
712 *msg = (struct rs_msg) {
713 .icmph = {
714 .icmp6_type = NDISC_ROUTER_SOLICITATION,
715 },
716 };
717
718 if (send_sllao)
719 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
720 dev->dev_addr,
721 NDISC_ROUTER_SOLICITATION);
722
723 ndisc_send_skb(skb, daddr, saddr);
724}
725
726
727static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
728{
729 /*
730 * "The sender MUST return an ICMP
731 * destination unreachable"
732 */
733 dst_link_failure(skb);
734 kfree_skb(skb);
735}
736
737/* Called with locked neigh: either read or both */
738
739static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
740{
741 struct in6_addr *saddr = NULL;
742 struct in6_addr mcaddr;
743 struct net_device *dev = neigh->dev;
744 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
745 int probes = atomic_read(&neigh->probes);
746
747 if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
748 dev, false, 1,
749 IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
750 saddr = &ipv6_hdr(skb)->saddr;
751 probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
752 if (probes < 0) {
753 if (!(READ_ONCE(neigh->nud_state) & NUD_VALID)) {
754 ND_PRINTK(1, dbg,
755 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
756 __func__, target);
757 }
758 ndisc_send_ns(dev, target, target, saddr, 0);
759 } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
760 neigh_app_ns(neigh);
761 } else {
762 addrconf_addr_solict_mult(target, &mcaddr);
763 ndisc_send_ns(dev, target, &mcaddr, saddr, 0);
764 }
765}
766
767static int pndisc_is_router(const void *pkey,
768 struct net_device *dev)
769{
770 struct pneigh_entry *n;
771 int ret = -1;
772
773 read_lock_bh(&nd_tbl.lock);
774 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
775 if (n)
776 ret = !!(n->flags & NTF_ROUTER);
777 read_unlock_bh(&nd_tbl.lock);
778
779 return ret;
780}
781
782void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
783 const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
784 struct ndisc_options *ndopts)
785{
786 neigh_update(neigh, lladdr, new, flags, 0);
787 /* report ndisc ops about neighbour update */
788 ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts);
789}
790
791static enum skb_drop_reason ndisc_recv_ns(struct sk_buff *skb)
792{
793 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
794 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
795 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
796 u8 *lladdr = NULL;
797 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
798 offsetof(struct nd_msg, opt));
799 struct ndisc_options ndopts;
800 struct net_device *dev = skb->dev;
801 struct inet6_ifaddr *ifp;
802 struct inet6_dev *idev = NULL;
803 struct neighbour *neigh;
804 int dad = ipv6_addr_any(saddr);
805 int is_router = -1;
806 SKB_DR(reason);
807 u64 nonce = 0;
808 bool inc;
809
810 if (skb->len < sizeof(struct nd_msg))
811 return SKB_DROP_REASON_PKT_TOO_SMALL;
812
813 if (ipv6_addr_is_multicast(&msg->target)) {
814 ND_PRINTK(2, warn, "NS: multicast target address\n");
815 return reason;
816 }
817
818 /*
819 * RFC2461 7.1.1:
820 * DAD has to be destined for solicited node multicast address.
821 */
822 if (dad && !ipv6_addr_is_solict_mult(daddr)) {
823 ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
824 return reason;
825 }
826
827 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts))
828 return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS;
829
830 if (ndopts.nd_opts_src_lladdr) {
831 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
832 if (!lladdr) {
833 ND_PRINTK(2, warn,
834 "NS: invalid link-layer address length\n");
835 return reason;
836 }
837
838 /* RFC2461 7.1.1:
839 * If the IP source address is the unspecified address,
840 * there MUST NOT be source link-layer address option
841 * in the message.
842 */
843 if (dad) {
844 ND_PRINTK(2, warn,
845 "NS: bad DAD packet (link-layer address option)\n");
846 return reason;
847 }
848 }
849 if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1)
850 memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6);
851
852 inc = ipv6_addr_is_multicast(daddr);
853
854 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
855 if (ifp) {
856have_ifp:
857 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
858 if (dad) {
859 if (nonce != 0 && ifp->dad_nonce == nonce) {
860 u8 *np = (u8 *)&nonce;
861 /* Matching nonce if looped back */
862 ND_PRINTK(2, notice,
863 "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n",
864 ifp->idev->dev->name,
865 &ifp->addr, np);
866 goto out;
867 }
868 /*
869 * We are colliding with another node
870 * who is doing DAD
871 * so fail our DAD process
872 */
873 addrconf_dad_failure(skb, ifp);
874 return reason;
875 } else {
876 /*
877 * This is not a dad solicitation.
878 * If we are an optimistic node,
879 * we should respond.
880 * Otherwise, we should ignore it.
881 */
882 if (!(ifp->flags & IFA_F_OPTIMISTIC))
883 goto out;
884 }
885 }
886
887 idev = ifp->idev;
888 } else {
889 struct net *net = dev_net(dev);
890
891 /* perhaps an address on the master device */
892 if (netif_is_l3_slave(dev)) {
893 struct net_device *mdev;
894
895 mdev = netdev_master_upper_dev_get_rcu(dev);
896 if (mdev) {
897 ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1);
898 if (ifp)
899 goto have_ifp;
900 }
901 }
902
903 idev = in6_dev_get(dev);
904 if (!idev) {
905 /* XXX: count this drop? */
906 return reason;
907 }
908
909 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
910 (READ_ONCE(idev->cnf.forwarding) &&
911 (READ_ONCE(net->ipv6.devconf_all->proxy_ndp) ||
912 READ_ONCE(idev->cnf.proxy_ndp)) &&
913 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
914 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
915 skb->pkt_type != PACKET_HOST &&
916 inc &&
917 NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) {
918 /*
919 * for anycast or proxy,
920 * sender should delay its response
921 * by a random time between 0 and
922 * MAX_ANYCAST_DELAY_TIME seconds.
923 * (RFC2461) -- yoshfuji
924 */
925 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
926 if (n)
927 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
928 goto out;
929 }
930 } else {
931 SKB_DR_SET(reason, IPV6_NDISC_NS_OTHERHOST);
932 goto out;
933 }
934 }
935
936 if (is_router < 0)
937 is_router = READ_ONCE(idev->cnf.forwarding);
938
939 if (dad) {
940 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
941 !!is_router, false, (ifp != NULL), true);
942 goto out;
943 }
944
945 if (inc)
946 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
947 else
948 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
949
950 /*
951 * update / create cache entry
952 * for the source address
953 */
954 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
955 !inc || lladdr || !dev->addr_len);
956 if (neigh)
957 ndisc_update(dev, neigh, lladdr, NUD_STALE,
958 NEIGH_UPDATE_F_WEAK_OVERRIDE|
959 NEIGH_UPDATE_F_OVERRIDE,
960 NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
961 if (neigh || !dev->header_ops) {
962 ndisc_send_na(dev, saddr, &msg->target, !!is_router,
963 true, (ifp != NULL && inc), inc);
964 if (neigh)
965 neigh_release(neigh);
966 reason = SKB_CONSUMED;
967 }
968
969out:
970 if (ifp)
971 in6_ifa_put(ifp);
972 else
973 in6_dev_put(idev);
974 return reason;
975}
976
977static int accept_untracked_na(struct net_device *dev, struct in6_addr *saddr)
978{
979 struct inet6_dev *idev = __in6_dev_get(dev);
980
981 switch (READ_ONCE(idev->cnf.accept_untracked_na)) {
982 case 0: /* Don't accept untracked na (absent in neighbor cache) */
983 return 0;
984 case 1: /* Create new entries from na if currently untracked */
985 return 1;
986 case 2: /* Create new entries from untracked na only if saddr is in the
987 * same subnet as an address configured on the interface that
988 * received the na
989 */
990 return !!ipv6_chk_prefix(saddr, dev);
991 default:
992 return 0;
993 }
994}
995
996static enum skb_drop_reason ndisc_recv_na(struct sk_buff *skb)
997{
998 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
999 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1000 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1001 u8 *lladdr = NULL;
1002 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
1003 offsetof(struct nd_msg, opt));
1004 struct ndisc_options ndopts;
1005 struct net_device *dev = skb->dev;
1006 struct inet6_dev *idev = __in6_dev_get(dev);
1007 struct inet6_ifaddr *ifp;
1008 struct neighbour *neigh;
1009 SKB_DR(reason);
1010 u8 new_state;
1011
1012 if (skb->len < sizeof(struct nd_msg))
1013 return SKB_DROP_REASON_PKT_TOO_SMALL;
1014
1015 if (ipv6_addr_is_multicast(&msg->target)) {
1016 ND_PRINTK(2, warn, "NA: target address is multicast\n");
1017 return reason;
1018 }
1019
1020 if (ipv6_addr_is_multicast(daddr) &&
1021 msg->icmph.icmp6_solicited) {
1022 ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
1023 return reason;
1024 }
1025
1026 /* For some 802.11 wireless deployments (and possibly other networks),
1027 * there will be a NA proxy and unsolicitd packets are attacks
1028 * and thus should not be accepted.
1029 * drop_unsolicited_na takes precedence over accept_untracked_na
1030 */
1031 if (!msg->icmph.icmp6_solicited && idev &&
1032 READ_ONCE(idev->cnf.drop_unsolicited_na))
1033 return reason;
1034
1035 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts))
1036 return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS;
1037
1038 if (ndopts.nd_opts_tgt_lladdr) {
1039 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
1040 if (!lladdr) {
1041 ND_PRINTK(2, warn,
1042 "NA: invalid link-layer address length\n");
1043 return reason;
1044 }
1045 }
1046 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
1047 if (ifp) {
1048 if (skb->pkt_type != PACKET_LOOPBACK
1049 && (ifp->flags & IFA_F_TENTATIVE)) {
1050 addrconf_dad_failure(skb, ifp);
1051 return reason;
1052 }
1053 /* What should we make now? The advertisement
1054 is invalid, but ndisc specs say nothing
1055 about it. It could be misconfiguration, or
1056 an smart proxy agent tries to help us :-)
1057
1058 We should not print the error if NA has been
1059 received from loopback - it is just our own
1060 unsolicited advertisement.
1061 */
1062 if (skb->pkt_type != PACKET_LOOPBACK)
1063 ND_PRINTK(1, warn,
1064 "NA: %pM advertised our address %pI6c on %s!\n",
1065 eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name);
1066 in6_ifa_put(ifp);
1067 return reason;
1068 }
1069
1070 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
1071
1072 /* RFC 9131 updates original Neighbour Discovery RFC 4861.
1073 * NAs with Target LL Address option without a corresponding
1074 * entry in the neighbour cache can now create a STALE neighbour
1075 * cache entry on routers.
1076 *
1077 * entry accept fwding solicited behaviour
1078 * ------- ------ ------ --------- ----------------------
1079 * present X X 0 Set state to STALE
1080 * present X X 1 Set state to REACHABLE
1081 * absent 0 X X Do nothing
1082 * absent 1 0 X Do nothing
1083 * absent 1 1 X Add a new STALE entry
1084 *
1085 * Note that we don't do a (daddr == all-routers-mcast) check.
1086 */
1087 new_state = msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE;
1088 if (!neigh && lladdr && idev && READ_ONCE(idev->cnf.forwarding)) {
1089 if (accept_untracked_na(dev, saddr)) {
1090 neigh = neigh_create(&nd_tbl, &msg->target, dev);
1091 new_state = NUD_STALE;
1092 }
1093 }
1094
1095 if (neigh && !IS_ERR(neigh)) {
1096 u8 old_flags = neigh->flags;
1097 struct net *net = dev_net(dev);
1098
1099 if (READ_ONCE(neigh->nud_state) & NUD_FAILED)
1100 goto out;
1101
1102 /*
1103 * Don't update the neighbor cache entry on a proxy NA from
1104 * ourselves because either the proxied node is off link or it
1105 * has already sent a NA to us.
1106 */
1107 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
1108 READ_ONCE(net->ipv6.devconf_all->forwarding) &&
1109 READ_ONCE(net->ipv6.devconf_all->proxy_ndp) &&
1110 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
1111 /* XXX: idev->cnf.proxy_ndp */
1112 goto out;
1113 }
1114
1115 ndisc_update(dev, neigh, lladdr,
1116 new_state,
1117 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1118 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
1119 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1120 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0),
1121 NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts);
1122
1123 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
1124 /*
1125 * Change: router to host
1126 */
1127 rt6_clean_tohost(dev_net(dev), saddr);
1128 }
1129 reason = SKB_CONSUMED;
1130out:
1131 neigh_release(neigh);
1132 }
1133 return reason;
1134}
1135
1136static enum skb_drop_reason ndisc_recv_rs(struct sk_buff *skb)
1137{
1138 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1139 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1140 struct neighbour *neigh;
1141 struct inet6_dev *idev;
1142 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1143 struct ndisc_options ndopts;
1144 u8 *lladdr = NULL;
1145 SKB_DR(reason);
1146
1147 if (skb->len < sizeof(*rs_msg))
1148 return SKB_DROP_REASON_PKT_TOO_SMALL;
1149
1150 idev = __in6_dev_get(skb->dev);
1151 if (!idev) {
1152 ND_PRINTK(1, err, "RS: can't find in6 device\n");
1153 return reason;
1154 }
1155
1156 /* Don't accept RS if we're not in router mode */
1157 if (!READ_ONCE(idev->cnf.forwarding))
1158 goto out;
1159
1160 /*
1161 * Don't update NCE if src = ::;
1162 * this implies that the source node has no ip address assigned yet.
1163 */
1164 if (ipv6_addr_any(saddr))
1165 goto out;
1166
1167 /* Parse ND options */
1168 if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts))
1169 return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS;
1170
1171 if (ndopts.nd_opts_src_lladdr) {
1172 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1173 skb->dev);
1174 if (!lladdr)
1175 goto out;
1176 }
1177
1178 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1179 if (neigh) {
1180 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1181 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1182 NEIGH_UPDATE_F_OVERRIDE|
1183 NEIGH_UPDATE_F_OVERRIDE_ISROUTER,
1184 NDISC_ROUTER_SOLICITATION, &ndopts);
1185 neigh_release(neigh);
1186 reason = SKB_CONSUMED;
1187 }
1188out:
1189 return reason;
1190}
1191
1192static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1193{
1194 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1195 struct sk_buff *skb;
1196 struct nlmsghdr *nlh;
1197 struct nduseroptmsg *ndmsg;
1198 struct net *net = dev_net(ra->dev);
1199 int err;
1200 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1201 + (opt->nd_opt_len << 3));
1202 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1203
1204 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1205 if (!skb) {
1206 err = -ENOBUFS;
1207 goto errout;
1208 }
1209
1210 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1211 if (!nlh) {
1212 goto nla_put_failure;
1213 }
1214
1215 ndmsg = nlmsg_data(nlh);
1216 ndmsg->nduseropt_family = AF_INET6;
1217 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1218 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1219 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1220 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1221
1222 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1223
1224 if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))
1225 goto nla_put_failure;
1226 nlmsg_end(skb, nlh);
1227
1228 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
1229 return;
1230
1231nla_put_failure:
1232 nlmsg_free(skb);
1233 err = -EMSGSIZE;
1234errout:
1235 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1236}
1237
1238static enum skb_drop_reason ndisc_router_discovery(struct sk_buff *skb)
1239{
1240 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1241 bool send_ifinfo_notify = false;
1242 struct neighbour *neigh = NULL;
1243 struct ndisc_options ndopts;
1244 struct fib6_info *rt = NULL;
1245 struct inet6_dev *in6_dev;
1246 struct fib6_table *table;
1247 u32 defrtr_usr_metric;
1248 unsigned int pref = 0;
1249 __u32 old_if_flags;
1250 struct net *net;
1251 SKB_DR(reason);
1252 int lifetime;
1253 int optlen;
1254
1255 __u8 *opt = (__u8 *)(ra_msg + 1);
1256
1257 optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
1258 sizeof(struct ra_msg);
1259
1260 ND_PRINTK(2, info,
1261 "RA: %s, dev: %s\n",
1262 __func__, skb->dev->name);
1263 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1264 ND_PRINTK(2, warn, "RA: source address is not link-local\n");
1265 return reason;
1266 }
1267 if (optlen < 0)
1268 return SKB_DROP_REASON_PKT_TOO_SMALL;
1269
1270#ifdef CONFIG_IPV6_NDISC_NODETYPE
1271 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1272 ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
1273 return reason;
1274 }
1275#endif
1276
1277 in6_dev = __in6_dev_get(skb->dev);
1278 if (!in6_dev) {
1279 ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
1280 skb->dev->name);
1281 return reason;
1282 }
1283
1284 if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts))
1285 return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS;
1286
1287 if (!ipv6_accept_ra(in6_dev)) {
1288 ND_PRINTK(2, info,
1289 "RA: %s, did not accept ra for dev: %s\n",
1290 __func__, skb->dev->name);
1291 goto skip_linkparms;
1292 }
1293
1294#ifdef CONFIG_IPV6_NDISC_NODETYPE
1295 /* skip link-specific parameters from interior routers */
1296 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1297 ND_PRINTK(2, info,
1298 "RA: %s, nodetype is NODEFAULT, dev: %s\n",
1299 __func__, skb->dev->name);
1300 goto skip_linkparms;
1301 }
1302#endif
1303
1304 if (in6_dev->if_flags & IF_RS_SENT) {
1305 /*
1306 * flag that an RA was received after an RS was sent
1307 * out on this interface.
1308 */
1309 in6_dev->if_flags |= IF_RA_RCVD;
1310 }
1311
1312 /*
1313 * Remember the managed/otherconf flags from most recently
1314 * received RA message (RFC 2462) -- yoshfuji
1315 */
1316 old_if_flags = in6_dev->if_flags;
1317 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1318 IF_RA_OTHERCONF)) |
1319 (ra_msg->icmph.icmp6_addrconf_managed ?
1320 IF_RA_MANAGED : 0) |
1321 (ra_msg->icmph.icmp6_addrconf_other ?
1322 IF_RA_OTHERCONF : 0);
1323
1324 if (old_if_flags != in6_dev->if_flags)
1325 send_ifinfo_notify = true;
1326
1327 if (!READ_ONCE(in6_dev->cnf.accept_ra_defrtr)) {
1328 ND_PRINTK(2, info,
1329 "RA: %s, defrtr is false for dev: %s\n",
1330 __func__, skb->dev->name);
1331 goto skip_defrtr;
1332 }
1333
1334 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1335 if (lifetime != 0 &&
1336 lifetime < READ_ONCE(in6_dev->cnf.accept_ra_min_lft)) {
1337 ND_PRINTK(2, info,
1338 "RA: router lifetime (%ds) is too short: %s\n",
1339 lifetime, skb->dev->name);
1340 goto skip_defrtr;
1341 }
1342
1343 /* Do not accept RA with source-addr found on local machine unless
1344 * accept_ra_from_local is set to true.
1345 */
1346 net = dev_net(in6_dev->dev);
1347 if (!READ_ONCE(in6_dev->cnf.accept_ra_from_local) &&
1348 ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) {
1349 ND_PRINTK(2, info,
1350 "RA from local address detected on dev: %s: default router ignored\n",
1351 skb->dev->name);
1352 goto skip_defrtr;
1353 }
1354
1355#ifdef CONFIG_IPV6_ROUTER_PREF
1356 pref = ra_msg->icmph.icmp6_router_pref;
1357 /* 10b is handled as if it were 00b (medium) */
1358 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1359 !READ_ONCE(in6_dev->cnf.accept_ra_rtr_pref))
1360 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1361#endif
1362 /* routes added from RAs do not use nexthop objects */
1363 rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
1364 if (rt) {
1365 neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
1366 rt->fib6_nh->fib_nh_dev, NULL,
1367 &ipv6_hdr(skb)->saddr);
1368 if (!neigh) {
1369 ND_PRINTK(0, err,
1370 "RA: %s got default router without neighbour\n",
1371 __func__);
1372 fib6_info_release(rt);
1373 return reason;
1374 }
1375 }
1376 /* Set default route metric as specified by user */
1377 defrtr_usr_metric = in6_dev->cnf.ra_defrtr_metric;
1378 /* delete the route if lifetime is 0 or if metric needs change */
1379 if (rt && (lifetime == 0 || rt->fib6_metric != defrtr_usr_metric)) {
1380 ip6_del_rt(net, rt, false);
1381 rt = NULL;
1382 }
1383
1384 ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, metric: %d, for dev: %s\n",
1385 rt, lifetime, defrtr_usr_metric, skb->dev->name);
1386 if (!rt && lifetime) {
1387 ND_PRINTK(3, info, "RA: adding default router\n");
1388
1389 if (neigh)
1390 neigh_release(neigh);
1391
1392 rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr,
1393 skb->dev, pref, defrtr_usr_metric,
1394 lifetime);
1395 if (!rt) {
1396 ND_PRINTK(0, err,
1397 "RA: %s failed to add default route\n",
1398 __func__);
1399 return reason;
1400 }
1401
1402 neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
1403 rt->fib6_nh->fib_nh_dev, NULL,
1404 &ipv6_hdr(skb)->saddr);
1405 if (!neigh) {
1406 ND_PRINTK(0, err,
1407 "RA: %s got default router without neighbour\n",
1408 __func__);
1409 fib6_info_release(rt);
1410 return reason;
1411 }
1412 neigh->flags |= NTF_ROUTER;
1413 } else if (rt && IPV6_EXTRACT_PREF(rt->fib6_flags) != pref) {
1414 struct nl_info nlinfo = {
1415 .nl_net = net,
1416 };
1417 rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1418 inet6_rt_notify(RTM_NEWROUTE, rt, &nlinfo, NLM_F_REPLACE);
1419 }
1420
1421 if (rt) {
1422 table = rt->fib6_table;
1423 spin_lock_bh(&table->tb6_lock);
1424
1425 fib6_set_expires(rt, jiffies + (HZ * lifetime));
1426 fib6_add_gc_list(rt);
1427
1428 spin_unlock_bh(&table->tb6_lock);
1429 }
1430 if (READ_ONCE(in6_dev->cnf.accept_ra_min_hop_limit) < 256 &&
1431 ra_msg->icmph.icmp6_hop_limit) {
1432 if (READ_ONCE(in6_dev->cnf.accept_ra_min_hop_limit) <=
1433 ra_msg->icmph.icmp6_hop_limit) {
1434 WRITE_ONCE(in6_dev->cnf.hop_limit,
1435 ra_msg->icmph.icmp6_hop_limit);
1436 fib6_metric_set(rt, RTAX_HOPLIMIT,
1437 ra_msg->icmph.icmp6_hop_limit);
1438 } else {
1439 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
1440 }
1441 }
1442
1443skip_defrtr:
1444
1445 /*
1446 * Update Reachable Time and Retrans Timer
1447 */
1448
1449 if (in6_dev->nd_parms) {
1450 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1451
1452 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1453 rtime = (rtime*HZ)/1000;
1454 if (rtime < HZ/100)
1455 rtime = HZ/100;
1456 NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
1457 in6_dev->tstamp = jiffies;
1458 send_ifinfo_notify = true;
1459 }
1460
1461 rtime = ntohl(ra_msg->reachable_time);
1462 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1463 rtime = (rtime*HZ)/1000;
1464
1465 if (rtime < HZ/10)
1466 rtime = HZ/10;
1467
1468 if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) {
1469 NEIGH_VAR_SET(in6_dev->nd_parms,
1470 BASE_REACHABLE_TIME, rtime);
1471 NEIGH_VAR_SET(in6_dev->nd_parms,
1472 GC_STALETIME, 3 * rtime);
1473 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1474 in6_dev->tstamp = jiffies;
1475 send_ifinfo_notify = true;
1476 }
1477 }
1478 }
1479
1480skip_linkparms:
1481
1482 /*
1483 * Process options.
1484 */
1485
1486 if (!neigh)
1487 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1488 skb->dev, 1);
1489 if (neigh) {
1490 u8 *lladdr = NULL;
1491 if (ndopts.nd_opts_src_lladdr) {
1492 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1493 skb->dev);
1494 if (!lladdr) {
1495 ND_PRINTK(2, warn,
1496 "RA: invalid link-layer address length\n");
1497 goto out;
1498 }
1499 }
1500 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1501 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1502 NEIGH_UPDATE_F_OVERRIDE|
1503 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1504 NEIGH_UPDATE_F_ISROUTER,
1505 NDISC_ROUTER_ADVERTISEMENT, &ndopts);
1506 reason = SKB_CONSUMED;
1507 }
1508
1509 if (!ipv6_accept_ra(in6_dev)) {
1510 ND_PRINTK(2, info,
1511 "RA: %s, accept_ra is false for dev: %s\n",
1512 __func__, skb->dev->name);
1513 goto out;
1514 }
1515
1516#ifdef CONFIG_IPV6_ROUTE_INFO
1517 if (!READ_ONCE(in6_dev->cnf.accept_ra_from_local) &&
1518 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
1519 in6_dev->dev, 0)) {
1520 ND_PRINTK(2, info,
1521 "RA from local address detected on dev: %s: router info ignored.\n",
1522 skb->dev->name);
1523 goto skip_routeinfo;
1524 }
1525
1526 if (READ_ONCE(in6_dev->cnf.accept_ra_rtr_pref) && ndopts.nd_opts_ri) {
1527 struct nd_opt_hdr *p;
1528 for (p = ndopts.nd_opts_ri;
1529 p;
1530 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1531 struct route_info *ri = (struct route_info *)p;
1532#ifdef CONFIG_IPV6_NDISC_NODETYPE
1533 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1534 ri->prefix_len == 0)
1535 continue;
1536#endif
1537 if (ri->prefix_len == 0 &&
1538 !READ_ONCE(in6_dev->cnf.accept_ra_defrtr))
1539 continue;
1540 if (ri->lifetime != 0 &&
1541 ntohl(ri->lifetime) < READ_ONCE(in6_dev->cnf.accept_ra_min_lft))
1542 continue;
1543 if (ri->prefix_len < READ_ONCE(in6_dev->cnf.accept_ra_rt_info_min_plen))
1544 continue;
1545 if (ri->prefix_len > READ_ONCE(in6_dev->cnf.accept_ra_rt_info_max_plen))
1546 continue;
1547 rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,
1548 &ipv6_hdr(skb)->saddr);
1549 }
1550 }
1551
1552skip_routeinfo:
1553#endif
1554
1555#ifdef CONFIG_IPV6_NDISC_NODETYPE
1556 /* skip link-specific ndopts from interior routers */
1557 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1558 ND_PRINTK(2, info,
1559 "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
1560 __func__, skb->dev->name);
1561 goto out;
1562 }
1563#endif
1564
1565 if (READ_ONCE(in6_dev->cnf.accept_ra_pinfo) && ndopts.nd_opts_pi) {
1566 struct nd_opt_hdr *p;
1567 for (p = ndopts.nd_opts_pi;
1568 p;
1569 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1570 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1571 (p->nd_opt_len) << 3,
1572 ndopts.nd_opts_src_lladdr != NULL);
1573 }
1574 }
1575
1576 if (ndopts.nd_opts_mtu && READ_ONCE(in6_dev->cnf.accept_ra_mtu)) {
1577 __be32 n;
1578 u32 mtu;
1579
1580 memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1581 mtu = ntohl(n);
1582
1583 if (in6_dev->ra_mtu != mtu) {
1584 in6_dev->ra_mtu = mtu;
1585 send_ifinfo_notify = true;
1586 }
1587
1588 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1589 ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
1590 } else if (READ_ONCE(in6_dev->cnf.mtu6) != mtu) {
1591 WRITE_ONCE(in6_dev->cnf.mtu6, mtu);
1592 fib6_metric_set(rt, RTAX_MTU, mtu);
1593 rt6_mtu_change(skb->dev, mtu);
1594 }
1595 }
1596
1597 if (ndopts.nd_useropts) {
1598 struct nd_opt_hdr *p;
1599 for (p = ndopts.nd_useropts;
1600 p;
1601 p = ndisc_next_useropt(skb->dev, p,
1602 ndopts.nd_useropts_end)) {
1603 ndisc_ra_useropt(skb, p);
1604 }
1605 }
1606
1607 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1608 ND_PRINTK(2, warn, "RA: invalid RA options\n");
1609 }
1610out:
1611 /* Send a notify if RA changed managed/otherconf flags or
1612 * timer settings or ra_mtu value
1613 */
1614 if (send_ifinfo_notify)
1615 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1616
1617 fib6_info_release(rt);
1618 if (neigh)
1619 neigh_release(neigh);
1620 return reason;
1621}
1622
1623static enum skb_drop_reason ndisc_redirect_rcv(struct sk_buff *skb)
1624{
1625 struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
1626 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
1627 offsetof(struct rd_msg, opt));
1628 struct ndisc_options ndopts;
1629 SKB_DR(reason);
1630 u8 *hdr;
1631
1632#ifdef CONFIG_IPV6_NDISC_NODETYPE
1633 switch (skb->ndisc_nodetype) {
1634 case NDISC_NODETYPE_HOST:
1635 case NDISC_NODETYPE_NODEFAULT:
1636 ND_PRINTK(2, warn,
1637 "Redirect: from host or unauthorized router\n");
1638 return reason;
1639 }
1640#endif
1641
1642 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1643 ND_PRINTK(2, warn,
1644 "Redirect: source address is not link-local\n");
1645 return reason;
1646 }
1647
1648 if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
1649 return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS;
1650
1651 if (!ndopts.nd_opts_rh) {
1652 ip6_redirect_no_header(skb, dev_net(skb->dev),
1653 skb->dev->ifindex);
1654 return reason;
1655 }
1656
1657 hdr = (u8 *)ndopts.nd_opts_rh;
1658 hdr += 8;
1659 if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
1660 return SKB_DROP_REASON_PKT_TOO_SMALL;
1661
1662 return icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
1663}
1664
1665static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
1666 struct sk_buff *orig_skb,
1667 int rd_len)
1668{
1669 u8 *opt = skb_put(skb, rd_len);
1670
1671 memset(opt, 0, 8);
1672 *(opt++) = ND_OPT_REDIRECT_HDR;
1673 *(opt++) = (rd_len >> 3);
1674 opt += 6;
1675
1676 skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt,
1677 rd_len - 8);
1678}
1679
1680void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
1681{
1682 struct net_device *dev = skb->dev;
1683 struct net *net = dev_net(dev);
1684 struct sock *sk = net->ipv6.ndisc_sk;
1685 int optlen = 0;
1686 struct inet_peer *peer;
1687 struct sk_buff *buff;
1688 struct rd_msg *msg;
1689 struct in6_addr saddr_buf;
1690 struct rt6_info *rt;
1691 struct dst_entry *dst;
1692 struct flowi6 fl6;
1693 int rd_len;
1694 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL,
1695 ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL;
1696 bool ret;
1697
1698 if (netif_is_l3_master(skb->dev)) {
1699 dev = dev_get_by_index_rcu(dev_net(skb->dev), IPCB(skb)->iif);
1700 if (!dev)
1701 return;
1702 }
1703
1704 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1705 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
1706 dev->name);
1707 return;
1708 }
1709
1710 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1711 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1712 ND_PRINTK(2, warn,
1713 "Redirect: target address is not link-local unicast\n");
1714 return;
1715 }
1716
1717 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
1718 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1719
1720 dst = ip6_route_output(net, NULL, &fl6);
1721 if (dst->error) {
1722 dst_release(dst);
1723 return;
1724 }
1725 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1726 if (IS_ERR(dst))
1727 return;
1728
1729 rt = dst_rt6_info(dst);
1730
1731 if (rt->rt6i_flags & RTF_GATEWAY) {
1732 ND_PRINTK(2, warn,
1733 "Redirect: destination is not a neighbour\n");
1734 goto release;
1735 }
1736
1737 rcu_read_lock();
1738 peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr);
1739 ret = inet_peer_xrlim_allow(peer, 1*HZ);
1740 rcu_read_unlock();
1741
1742 if (!ret)
1743 goto release;
1744
1745 if (dev->addr_len) {
1746 struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
1747 if (!neigh) {
1748 ND_PRINTK(2, warn,
1749 "Redirect: no neigh for target address\n");
1750 goto release;
1751 }
1752
1753 read_lock_bh(&neigh->lock);
1754 if (neigh->nud_state & NUD_VALID) {
1755 memcpy(ha_buf, neigh->ha, dev->addr_len);
1756 read_unlock_bh(&neigh->lock);
1757 ha = ha_buf;
1758 optlen += ndisc_redirect_opt_addr_space(dev, neigh,
1759 ops_data_buf,
1760 &ops_data);
1761 } else
1762 read_unlock_bh(&neigh->lock);
1763
1764 neigh_release(neigh);
1765 }
1766
1767 rd_len = min_t(unsigned int,
1768 IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
1769 skb->len + 8);
1770 rd_len &= ~0x7;
1771 optlen += rd_len;
1772
1773 buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
1774 if (!buff)
1775 goto release;
1776
1777 msg = skb_put(buff, sizeof(*msg));
1778 *msg = (struct rd_msg) {
1779 .icmph = {
1780 .icmp6_type = NDISC_REDIRECT,
1781 },
1782 .target = *target,
1783 .dest = ipv6_hdr(skb)->daddr,
1784 };
1785
1786 /*
1787 * include target_address option
1788 */
1789
1790 if (ha)
1791 ndisc_fill_redirect_addr_option(buff, ha, ops_data);
1792
1793 /*
1794 * build redirect option and copy skb over to the new packet.
1795 */
1796
1797 if (rd_len)
1798 ndisc_fill_redirect_hdr_option(buff, skb, rd_len);
1799
1800 skb_dst_set(buff, dst);
1801 ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
1802 return;
1803
1804release:
1805 dst_release(dst);
1806}
1807
1808static void pndisc_redo(struct sk_buff *skb)
1809{
1810 enum skb_drop_reason reason = ndisc_recv_ns(skb);
1811
1812 kfree_skb_reason(skb, reason);
1813}
1814
1815static int ndisc_is_multicast(const void *pkey)
1816{
1817 return ipv6_addr_is_multicast((struct in6_addr *)pkey);
1818}
1819
1820static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
1821{
1822 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1823
1824 if (!idev)
1825 return true;
1826 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
1827 READ_ONCE(idev->cnf.suppress_frag_ndisc)) {
1828 net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
1829 return true;
1830 }
1831 return false;
1832}
1833
1834enum skb_drop_reason ndisc_rcv(struct sk_buff *skb)
1835{
1836 struct nd_msg *msg;
1837 SKB_DR(reason);
1838
1839 if (ndisc_suppress_frag_ndisc(skb))
1840 return SKB_DROP_REASON_IPV6_NDISC_FRAG;
1841
1842 if (skb_linearize(skb))
1843 return SKB_DROP_REASON_NOMEM;
1844
1845 msg = (struct nd_msg *)skb_transport_header(skb);
1846
1847 __skb_push(skb, skb->data - skb_transport_header(skb));
1848
1849 if (ipv6_hdr(skb)->hop_limit != 255) {
1850 ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
1851 ipv6_hdr(skb)->hop_limit);
1852 return SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT;
1853 }
1854
1855 if (msg->icmph.icmp6_code != 0) {
1856 ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
1857 msg->icmph.icmp6_code);
1858 return SKB_DROP_REASON_IPV6_NDISC_BAD_CODE;
1859 }
1860
1861 switch (msg->icmph.icmp6_type) {
1862 case NDISC_NEIGHBOUR_SOLICITATION:
1863 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1864 reason = ndisc_recv_ns(skb);
1865 break;
1866
1867 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1868 reason = ndisc_recv_na(skb);
1869 break;
1870
1871 case NDISC_ROUTER_SOLICITATION:
1872 reason = ndisc_recv_rs(skb);
1873 break;
1874
1875 case NDISC_ROUTER_ADVERTISEMENT:
1876 reason = ndisc_router_discovery(skb);
1877 break;
1878
1879 case NDISC_REDIRECT:
1880 reason = ndisc_redirect_rcv(skb);
1881 break;
1882 }
1883
1884 return reason;
1885}
1886
1887static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1888{
1889 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1890 struct netdev_notifier_change_info *change_info;
1891 struct net *net = dev_net(dev);
1892 struct inet6_dev *idev;
1893 bool evict_nocarrier;
1894
1895 switch (event) {
1896 case NETDEV_CHANGEADDR:
1897 neigh_changeaddr(&nd_tbl, dev);
1898 fib6_run_gc(0, net, false);
1899 fallthrough;
1900 case NETDEV_UP:
1901 idev = in6_dev_get(dev);
1902 if (!idev)
1903 break;
1904 if (READ_ONCE(idev->cnf.ndisc_notify) ||
1905 READ_ONCE(net->ipv6.devconf_all->ndisc_notify))
1906 ndisc_send_unsol_na(dev);
1907 in6_dev_put(idev);
1908 break;
1909 case NETDEV_CHANGE:
1910 idev = in6_dev_get(dev);
1911 if (!idev)
1912 evict_nocarrier = true;
1913 else {
1914 evict_nocarrier = READ_ONCE(idev->cnf.ndisc_evict_nocarrier) &&
1915 READ_ONCE(net->ipv6.devconf_all->ndisc_evict_nocarrier);
1916 in6_dev_put(idev);
1917 }
1918
1919 change_info = ptr;
1920 if (change_info->flags_changed & IFF_NOARP)
1921 neigh_changeaddr(&nd_tbl, dev);
1922 if (evict_nocarrier && !netif_carrier_ok(dev))
1923 neigh_carrier_down(&nd_tbl, dev);
1924 break;
1925 case NETDEV_DOWN:
1926 neigh_ifdown(&nd_tbl, dev);
1927 fib6_run_gc(0, net, false);
1928 break;
1929 case NETDEV_NOTIFY_PEERS:
1930 ndisc_send_unsol_na(dev);
1931 break;
1932 default:
1933 break;
1934 }
1935
1936 return NOTIFY_DONE;
1937}
1938
1939static struct notifier_block ndisc_netdev_notifier = {
1940 .notifier_call = ndisc_netdev_event,
1941 .priority = ADDRCONF_NOTIFY_PRIORITY - 5,
1942};
1943
1944#ifdef CONFIG_SYSCTL
1945static void ndisc_warn_deprecated_sysctl(const struct ctl_table *ctl,
1946 const char *func, const char *dev_name)
1947{
1948 static char warncomm[TASK_COMM_LEN];
1949 static int warned;
1950 if (strcmp(warncomm, current->comm) && warned < 5) {
1951 strscpy(warncomm, current->comm);
1952 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
1953 warncomm, func,
1954 dev_name, ctl->procname,
1955 dev_name, ctl->procname);
1956 warned++;
1957 }
1958}
1959
1960int ndisc_ifinfo_sysctl_change(const struct ctl_table *ctl, int write, void *buffer,
1961 size_t *lenp, loff_t *ppos)
1962{
1963 struct net_device *dev = ctl->extra1;
1964 struct inet6_dev *idev;
1965 int ret;
1966
1967 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1968 (strcmp(ctl->procname, "base_reachable_time") == 0))
1969 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1970
1971 if (strcmp(ctl->procname, "retrans_time") == 0)
1972 ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);
1973
1974 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1975 ret = neigh_proc_dointvec_jiffies(ctl, write,
1976 buffer, lenp, ppos);
1977
1978 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1979 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1980 ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
1981 buffer, lenp, ppos);
1982 else
1983 ret = -1;
1984
1985 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1986 if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
1987 idev->nd_parms->reachable_time =
1988 neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
1989 WRITE_ONCE(idev->tstamp, jiffies);
1990 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1991 in6_dev_put(idev);
1992 }
1993 return ret;
1994}
1995
1996
1997#endif
1998
1999static int __net_init ndisc_net_init(struct net *net)
2000{
2001 struct ipv6_pinfo *np;
2002 struct sock *sk;
2003 int err;
2004
2005 err = inet_ctl_sock_create(&sk, PF_INET6,
2006 SOCK_RAW, IPPROTO_ICMPV6, net);
2007 if (err < 0) {
2008 ND_PRINTK(0, err,
2009 "NDISC: Failed to initialize the control socket (err %d)\n",
2010 err);
2011 return err;
2012 }
2013
2014 net->ipv6.ndisc_sk = sk;
2015
2016 np = inet6_sk(sk);
2017 np->hop_limit = 255;
2018 /* Do not loopback ndisc messages */
2019 inet6_clear_bit(MC6_LOOP, sk);
2020
2021 return 0;
2022}
2023
2024static void __net_exit ndisc_net_exit(struct net *net)
2025{
2026 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
2027}
2028
2029static struct pernet_operations ndisc_net_ops = {
2030 .init = ndisc_net_init,
2031 .exit = ndisc_net_exit,
2032};
2033
2034int __init ndisc_init(void)
2035{
2036 int err;
2037
2038 err = register_pernet_subsys(&ndisc_net_ops);
2039 if (err)
2040 return err;
2041 /*
2042 * Initialize the neighbour table
2043 */
2044 neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
2045
2046#ifdef CONFIG_SYSCTL
2047 err = neigh_sysctl_register(NULL, &nd_tbl.parms,
2048 ndisc_ifinfo_sysctl_change);
2049 if (err)
2050 goto out_unregister_pernet;
2051out:
2052#endif
2053 return err;
2054
2055#ifdef CONFIG_SYSCTL
2056out_unregister_pernet:
2057 unregister_pernet_subsys(&ndisc_net_ops);
2058 goto out;
2059#endif
2060}
2061
2062int __init ndisc_late_init(void)
2063{
2064 return register_netdevice_notifier(&ndisc_netdev_notifier);
2065}
2066
2067void ndisc_late_cleanup(void)
2068{
2069 unregister_netdevice_notifier(&ndisc_netdev_notifier);
2070}
2071
2072void ndisc_cleanup(void)
2073{
2074#ifdef CONFIG_SYSCTL
2075 neigh_sysctl_unregister(&nd_tbl.parms);
2076#endif
2077 neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
2078 unregister_pernet_subsys(&ndisc_net_ops);
2079}