blob: 7ebac630d3c603186be2fc0dcbaac7d7e74bfde6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Neighbour Discovery for IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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 *
Alexey I. Froloffe35f30c2012-04-06 05:50:58 +000018 * Alexey I. Froloff : RFC6106 (DNSSL) support
Pierre Ynard31910572007-10-10 21:22:05 -070019 * Pierre Ynard : export userland ND options
20 * through netlink (RDNSS support)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 * Lars Fenneberg : fixed MTU setting on receipt
22 * of an RA.
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * 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
Joe Perches675418d2012-05-16 19:28:38 +000030#define pr_fmt(fmt) "ICMPv6: " fmt
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090043#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#ifdef CONFIG_SYSCTL
45#include <linux/sysctl.h>
46#endif
47
Thomas Graf18237302006-08-04 23:04:54 -070048#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#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
Pierre Ynard31910572007-10-10 21:22:05 -070064#include <net/netlink.h>
65#include <linux/rtnetlink.h>
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <net/flow.h>
68#include <net/ip6_checksum.h>
Denis V. Lunev1ed85162008-04-03 14:31:03 -070069#include <net/inet_common.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/proc_fs.h>
71
72#include <linux/netfilter.h>
73#include <linux/netfilter_ipv6.h>
74
Eric Dumazetd6bf7812010-10-04 06:15:44 +000075static u32 ndisc_hash(const void *pkey,
76 const struct net_device *dev,
David S. Miller2c2aba62011-12-28 15:06:58 -050077 __u32 *hash_rnd);
Eric W. Biederman60395a22015-03-03 17:10:44 -060078static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static int ndisc_constructor(struct neighbour *neigh);
80static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
81static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
82static int pndisc_constructor(struct pneigh_entry *n);
83static void pndisc_destructor(struct pneigh_entry *n);
84static void pndisc_redo(struct sk_buff *skb);
85
Stephen Hemminger89d69d22009-09-01 11:13:19 +000086static const struct neigh_ops ndisc_generic_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 .family = AF_INET6,
88 .solicit = ndisc_solicit,
89 .error_report = ndisc_error_report,
90 .output = neigh_resolve_output,
91 .connected_output = neigh_connected_output,
Linus Torvalds1da177e2005-04-16 15:20:36 -070092};
93
Stephen Hemminger89d69d22009-09-01 11:13:19 +000094static const struct neigh_ops ndisc_hh_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 .family = AF_INET6,
96 .solicit = ndisc_solicit,
97 .error_report = ndisc_error_report,
98 .output = neigh_resolve_output,
99 .connected_output = neigh_resolve_output,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100};
101
102
Stephen Hemminger89d69d22009-09-01 11:13:19 +0000103static const struct neigh_ops ndisc_direct_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 .family = AF_INET6,
David S. Miller8f40b162011-07-17 13:34:11 -0700105 .output = neigh_direct_output,
106 .connected_output = neigh_direct_output,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109struct neigh_table nd_tbl = {
110 .family = AF_INET6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 .key_len = sizeof(struct in6_addr),
Eric W. Biedermanbdf53c52015-03-02 00:13:22 -0600112 .protocol = cpu_to_be16(ETH_P_IPV6),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 .hash = ndisc_hash,
Eric W. Biederman60395a22015-03-03 17:10:44 -0600114 .key_eq = ndisc_key_eq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 .constructor = ndisc_constructor,
116 .pconstructor = pndisc_constructor,
117 .pdestructor = pndisc_destructor,
118 .proxy_redo = pndisc_redo,
119 .id = "ndisc_cache",
120 .parms = {
Shan Weib6720832010-12-01 18:05:12 +0000121 .tbl = &nd_tbl,
Shan Weib6720832010-12-01 18:05:12 +0000122 .reachable_time = ND_REACHABLE_TIME,
Jiri Pirko1f9248e2013-12-07 19:26:53 +0100123 .data = {
124 [NEIGH_VAR_MCAST_PROBES] = 3,
125 [NEIGH_VAR_UCAST_PROBES] = 3,
126 [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
127 [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
128 [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
129 [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
130 [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024,
131 [NEIGH_VAR_PROXY_QLEN] = 64,
132 [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
133 [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
134 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 },
136 .gc_interval = 30 * HZ,
137 .gc_thresh1 = 128,
138 .gc_thresh2 = 512,
139 .gc_thresh3 = 1024,
140};
David Ahernc4850682015-10-12 11:47:08 -0700141EXPORT_SYMBOL_GPL(nd_tbl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Alexander Aringcc84b3c2016-06-15 21:20:24 +0200143void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
144 int data_len, int pad)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Alexander Aring8ec5da42016-06-15 21:20:21 +0200146 int space = __ndisc_opt_addr_space(data_len, pad);
YOSHIFUJI Hideaki / 吉藤英明5f5a0112013-01-21 06:48:53 +0000147 u8 *opt = skb_put(skb, space);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 opt[0] = type;
150 opt[1] = space>>3;
151
152 memset(opt + 2, 0, pad);
153 opt += pad;
154 space -= pad;
155
156 memcpy(opt+2, data, data_len);
157 data_len += 2;
158 opt += data_len;
Ian Morrise5d08d72014-11-23 21:28:43 +0000159 space -= data_len;
160 if (space > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 memset(opt, 0, space);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
Alexander Aringcc84b3c2016-06-15 21:20:24 +0200163EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Alexander Aring8ec5da42016-06-15 21:20:21 +0200165static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
Alexander Aringf997c552016-06-15 21:20:23 +0200166 void *data, u8 icmp6_type)
Alexander Aring8ec5da42016-06-15 21:20:21 +0200167{
168 __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
169 ndisc_addr_option_pad(skb->dev->type));
Alexander Aringf997c552016-06-15 21:20:23 +0200170 ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type);
171}
172
173static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb,
174 void *ha,
175 const u8 *ops_data)
176{
177 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT);
178 ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data);
Alexander Aring8ec5da42016-06-15 21:20:21 +0200179}
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
182 struct nd_opt_hdr *end)
183{
184 int type;
185 if (!cur || !end || cur >= end)
186 return NULL;
187 type = cur->nd_opt_type;
188 do {
189 cur = ((void *)cur) + (cur->nd_opt_len << 3);
Ian Morris67ba4152014-08-24 21:53:10 +0100190 } while (cur < end && cur->nd_opt_type != type);
Eric Dumazeta02cec22010-09-22 20:43:57 +0000191 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Alexander Aringf997c552016-06-15 21:20:23 +0200194static inline int ndisc_is_useropt(const struct net_device *dev,
195 struct nd_opt_hdr *opt)
Pierre Ynard31910572007-10-10 21:22:05 -0700196{
Alexey I. Froloffe35f30c2012-04-06 05:50:58 +0000197 return opt->nd_opt_type == ND_OPT_RDNSS ||
Alexander Aringf997c552016-06-15 21:20:23 +0200198 opt->nd_opt_type == ND_OPT_DNSSL ||
199 ndisc_ops_is_useropt(dev, opt->nd_opt_type);
Pierre Ynard31910572007-10-10 21:22:05 -0700200}
201
Alexander Aringf997c552016-06-15 21:20:23 +0200202static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
203 struct nd_opt_hdr *cur,
Pierre Ynard31910572007-10-10 21:22:05 -0700204 struct nd_opt_hdr *end)
205{
206 if (!cur || !end || cur >= end)
207 return NULL;
208 do {
209 cur = ((void *)cur) + (cur->nd_opt_len << 3);
Alexander Aringf997c552016-06-15 21:20:23 +0200210 } while (cur < end && !ndisc_is_useropt(dev, cur));
211 return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
Pierre Ynard31910572007-10-10 21:22:05 -0700212}
213
Alexander Aringf997c552016-06-15 21:20:23 +0200214struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
215 u8 *opt, int opt_len,
David S. Miller30f2a5f2012-07-11 23:26:46 -0700216 struct ndisc_options *ndopts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
219
220 if (!nd_opt || opt_len < 0 || !ndopts)
221 return NULL;
222 memset(ndopts, 0, sizeof(*ndopts));
223 while (opt_len) {
224 int l;
225 if (opt_len < sizeof(struct nd_opt_hdr))
226 return NULL;
227 l = nd_opt->nd_opt_len << 3;
228 if (opt_len < l || l == 0)
229 return NULL;
Alexander Aringf997c552016-06-15 21:20:23 +0200230 if (ndisc_ops_parse_options(dev, nd_opt, ndopts))
231 goto next_opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 switch (nd_opt->nd_opt_type) {
233 case ND_OPT_SOURCE_LL_ADDR:
234 case ND_OPT_TARGET_LL_ADDR:
235 case ND_OPT_MTU:
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800236 case ND_OPT_NONCE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 case ND_OPT_REDIRECT_HDR:
238 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
Joe Perches675418d2012-05-16 19:28:38 +0000239 ND_PRINTK(2, warn,
240 "%s: duplicated ND6 option found: type=%d\n",
241 __func__, nd_opt->nd_opt_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 } else {
243 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
244 }
245 break;
246 case ND_OPT_PREFIX_INFO:
247 ndopts->nd_opts_pi_end = nd_opt;
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700248 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
250 break;
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -0800251#ifdef CONFIG_IPV6_ROUTE_INFO
252 case ND_OPT_ROUTE_INFO:
253 ndopts->nd_opts_ri_end = nd_opt;
254 if (!ndopts->nd_opts_ri)
255 ndopts->nd_opts_ri = nd_opt;
256 break;
257#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 default:
Alexander Aringf997c552016-06-15 21:20:23 +0200259 if (ndisc_is_useropt(dev, nd_opt)) {
Pierre Ynard31910572007-10-10 21:22:05 -0700260 ndopts->nd_useropts_end = nd_opt;
261 if (!ndopts->nd_useropts)
262 ndopts->nd_useropts = nd_opt;
263 } else {
264 /*
265 * Unknown options must be silently ignored,
266 * to accommodate future extension to the
267 * protocol.
268 */
Joe Perches675418d2012-05-16 19:28:38 +0000269 ND_PRINTK(2, notice,
270 "%s: ignored unsupported option; type=%d, len=%d\n",
271 __func__,
272 nd_opt->nd_opt_type,
273 nd_opt->nd_opt_len);
Pierre Ynard31910572007-10-10 21:22:05 -0700274 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 }
Alexander Aringf997c552016-06-15 21:20:23 +0200276next_opt:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 opt_len -= l;
278 nd_opt = ((void *)nd_opt) + l;
279 }
280 return ndopts;
281}
282
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000283int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 switch (dev->type) {
286 case ARPHRD_ETHER:
287 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
288 case ARPHRD_FDDI:
289 ipv6_eth_mc_map(addr, buf);
290 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 case ARPHRD_ARCNET:
292 ipv6_arcnet_mc_map(addr, buf);
293 return 0;
294 case ARPHRD_INFINIBAND:
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700295 ipv6_ib_mc_map(addr, dev->broadcast, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return 0;
Timo Teräs93ca3bb2011-03-28 22:40:53 +0000297 case ARPHRD_IPGRE:
298 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 default:
300 if (dir) {
301 memcpy(buf, dev->broadcast, dev->addr_len);
302 return 0;
303 }
304 }
305 return -EINVAL;
306}
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +0900307EXPORT_SYMBOL(ndisc_mc_map);
308
Eric Dumazetd6bf7812010-10-04 06:15:44 +0000309static u32 ndisc_hash(const void *pkey,
310 const struct net_device *dev,
David S. Miller2c2aba62011-12-28 15:06:58 -0500311 __u32 *hash_rnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
David S. Miller2c2aba62011-12-28 15:06:58 -0500313 return ndisc_hashfn(pkey, dev, hash_rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
Eric W. Biederman60395a22015-03-03 17:10:44 -0600316static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
317{
318 return neigh_key_eq128(n, pkey);
319}
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321static int ndisc_constructor(struct neighbour *neigh)
322{
Ian Morris67ba4152014-08-24 21:53:10 +0100323 struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 struct net_device *dev = neigh->dev;
325 struct inet6_dev *in6_dev;
326 struct neigh_parms *parms;
Eric Dumazeta50feda2012-05-18 18:57:34 +0000327 bool is_multicast = ipv6_addr_is_multicast(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 in6_dev = in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +0100330 if (!in6_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 return -EINVAL;
332 }
333
334 parms = in6_dev->nd_parms;
335 __neigh_parms_put(neigh->parms);
336 neigh->parms = neigh_parms_clone(parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700339 if (!dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 neigh->nud_state = NUD_NOARP;
341 neigh->ops = &ndisc_direct_ops;
David S. Miller8f40b162011-07-17 13:34:11 -0700342 neigh->output = neigh_direct_output;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 } else {
344 if (is_multicast) {
345 neigh->nud_state = NUD_NOARP;
346 ndisc_mc_map(addr, neigh->ha, dev, 1);
347 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
348 neigh->nud_state = NUD_NOARP;
349 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
350 if (dev->flags&IFF_LOOPBACK)
351 neigh->type = RTN_LOCAL;
352 } else if (dev->flags&IFF_POINTOPOINT) {
353 neigh->nud_state = NUD_NOARP;
354 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
355 }
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700356 if (dev->header_ops->cache)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 neigh->ops = &ndisc_hh_ops;
358 else
359 neigh->ops = &ndisc_generic_ops;
360 if (neigh->nud_state&NUD_VALID)
361 neigh->output = neigh->ops->connected_output;
362 else
363 neigh->output = neigh->ops->output;
364 }
365 in6_dev_put(in6_dev);
366 return 0;
367}
368
369static int pndisc_constructor(struct pneigh_entry *n)
370{
Ian Morris67ba4152014-08-24 21:53:10 +0100371 struct in6_addr *addr = (struct in6_addr *)&n->key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 struct in6_addr maddr;
373 struct net_device *dev = n->dev;
374
Ian Morris63159f22015-03-29 14:00:04 +0100375 if (!dev || !__in6_dev_get(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return -EINVAL;
377 addrconf_addr_solict_mult(addr, &maddr);
378 ipv6_dev_mc_inc(dev, &maddr);
379 return 0;
380}
381
382static void pndisc_destructor(struct pneigh_entry *n)
383{
Ian Morris67ba4152014-08-24 21:53:10 +0100384 struct in6_addr *addr = (struct in6_addr *)&n->key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 struct in6_addr maddr;
386 struct net_device *dev = n->dev;
387
Ian Morris63159f22015-03-29 14:00:04 +0100388 if (!dev || !__in6_dev_get(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return;
390 addrconf_addr_solict_mult(addr, &maddr);
391 ipv6_dev_mc_dec(dev, &maddr);
392}
393
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000394static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
395 int len)
396{
397 int hlen = LL_RESERVED_SPACE(dev);
398 int tlen = dev->needed_tailroom;
399 struct sock *sk = dev_net(dev)->ipv6.ndisc_sk;
400 struct sk_buff *skb;
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000401
Thomas Graf25a6e6b2013-09-03 13:37:01 +0200402 skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000403 if (!skb) {
Thomas Graf25a6e6b2013-09-03 13:37:01 +0200404 ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n",
405 __func__);
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000406 return NULL;
407 }
408
YOSHIFUJI Hideaki / 吉藤英明f382d032013-01-21 06:48:29 +0000409 skb->protocol = htons(ETH_P_IPV6);
410 skb->dev = dev;
411
YOSHIFUJI Hideaki / 吉藤英明527a1502013-01-21 06:48:39 +0000412 skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
YOSHIFUJI Hideaki / 吉藤英明5135e632013-01-21 06:48:44 +0000413 skb_reset_transport_header(skb);
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000414
Thomas Graf25a6e6b2013-09-03 13:37:01 +0200415 /* Manually assign socket ownership as we avoid calling
416 * sock_alloc_send_pskb() to bypass wmem buffer limits
417 */
418 skb_set_owner_w(skb, sk);
419
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +0000420 return skb;
421}
422
YOSHIFUJI Hideaki / 吉藤英明f382d032013-01-21 06:48:29 +0000423static void ip6_nd_hdr(struct sk_buff *skb,
YOSHIFUJI Hideaki / 吉藤英明2576f172013-01-21 06:48:19 +0000424 const struct in6_addr *saddr,
425 const struct in6_addr *daddr,
YOSHIFUJI Hideaki / 吉藤英明c8d6c382013-01-21 06:48:24 +0000426 int hop_limit, int len)
YOSHIFUJI Hideaki / 吉藤英明2576f172013-01-21 06:48:19 +0000427{
428 struct ipv6hdr *hdr;
429
YOSHIFUJI Hideaki / 吉藤英明527a1502013-01-21 06:48:39 +0000430 skb_push(skb, sizeof(*hdr));
YOSHIFUJI Hideaki / 吉藤英明2576f172013-01-21 06:48:19 +0000431 skb_reset_network_header(skb);
YOSHIFUJI Hideaki / 吉藤英明2576f172013-01-21 06:48:19 +0000432 hdr = ipv6_hdr(skb);
433
434 ip6_flow_hdr(hdr, 0, 0);
435
436 hdr->payload_len = htons(len);
YOSHIFUJI Hideaki / 吉藤英明c8d6c382013-01-21 06:48:24 +0000437 hdr->nexthdr = IPPROTO_ICMPV6;
438 hdr->hop_limit = hop_limit;
YOSHIFUJI Hideaki / 吉藤英明2576f172013-01-21 06:48:19 +0000439
440 hdr->saddr = *saddr;
441 hdr->daddr = *daddr;
442}
443
YOSHIFUJI Hideaki / 吉藤英明af9a9972013-01-21 06:48:34 +0000444static void ndisc_send_skb(struct sk_buff *skb,
YOSHIFUJI Hideakifd0ea7d2012-12-13 02:40:26 +0900445 const struct in6_addr *daddr,
YOSHIFUJI Hideaki / 吉藤英明aa4bdd42013-01-21 06:48:58 +0000446 const struct in6_addr *saddr)
Brian Haley305d5522008-11-04 17:51:14 -0800447{
YOSHIFUJI Hideaki / 吉藤英明f4de84c2013-01-21 06:49:03 +0000448 struct dst_entry *dst = skb_dst(skb);
YOSHIFUJI Hideaki / 吉藤英明af9a9972013-01-21 06:48:34 +0000449 struct net *net = dev_net(skb->dev);
YOSHIFUJI Hideaki / 吉藤英明7b3d9b02013-01-21 06:49:08 +0000450 struct sock *sk = net->ipv6.ndisc_sk;
Brian Haley305d5522008-11-04 17:51:14 -0800451 struct inet6_dev *idev;
452 int err;
YOSHIFUJI Hideaki / 吉藤英明aa4bdd42013-01-21 06:48:58 +0000453 struct icmp6hdr *icmp6h = icmp6_hdr(skb);
Brian Haley305d5522008-11-04 17:51:14 -0800454 u8 type;
455
456 type = icmp6h->icmp6_type;
457
YOSHIFUJI Hideaki / 吉藤英明f4de84c2013-01-21 06:49:03 +0000458 if (!dst) {
YOSHIFUJI Hideaki / 吉藤英明f4de84c2013-01-21 06:49:03 +0000459 struct flowi6 fl6;
David Aherne0d56fd2016-09-10 12:09:57 -0700460 int oif = skb->dev->ifindex;
Brian Haley305d5522008-11-04 17:51:14 -0800461
David Ahernca254492015-10-12 11:47:10 -0700462 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
YOSHIFUJI Hideaki / 吉藤英明f4de84c2013-01-21 06:49:03 +0000463 dst = icmp6_dst_alloc(skb->dev, &fl6);
464 if (IS_ERR(dst)) {
465 kfree_skb(skb);
466 return;
467 }
468
469 skb_dst_set(skb, dst);
470 }
YOSHIFUJI Hideakie1ec7842007-04-24 20:44:52 +0900471
YOSHIFUJI Hideaki / 吉藤英明7b3d9b02013-01-21 06:49:08 +0000472 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
473 IPPROTO_ICMPV6,
474 csum_partial(icmp6h,
475 skb->len, 0));
476
477 ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);
478
Eric Dumazetcfdf7642011-07-27 21:13:03 +0000479 rcu_read_lock();
480 idev = __in6_dev_get(dst->dev);
Neil Hormanedf391f2009-04-27 02:45:02 -0700481 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
YOSHIFUJI Hideakie1ec7842007-04-24 20:44:52 +0900482
Eric W. Biederman29a26a52015-09-15 20:04:16 -0500483 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
484 net, sk, skb, NULL, dst->dev,
Eric W. Biederman13206b62015-10-07 16:48:35 -0500485 dst_output);
YOSHIFUJI Hideakie1ec7842007-04-24 20:44:52 +0900486 if (!err) {
Denis V. Lunev5c5d2442008-10-08 10:33:50 -0700487 ICMP6MSGOUT_INC_STATS(net, idev, type);
Denis V. Luneva862f6a2008-10-08 10:33:06 -0700488 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
YOSHIFUJI Hideakie1ec7842007-04-24 20:44:52 +0900489 }
490
Eric Dumazetcfdf7642011-07-27 21:13:03 +0000491 rcu_read_unlock();
YOSHIFUJI Hideakie1ec7842007-04-24 20:44:52 +0900492}
493
Jiri Benc38cf5952015-09-22 18:57:13 +0200494void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
Cong Wangf564f452013-08-31 13:44:36 +0800495 const struct in6_addr *solicited_addr,
496 bool router, bool solicited, bool override, bool inc_opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000498 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 struct in6_addr tmpaddr;
500 struct inet6_ifaddr *ifp;
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900501 const struct in6_addr *src_addr;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000502 struct nd_msg *msg;
503 int optlen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 /* for anycast or proxy, solicited_addr != src_addr */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900506 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900507 if (ifp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 src_addr = solicited_addr;
Neil Horman95c385b2007-04-25 17:08:10 -0700509 if (ifp->flags & IFA_F_OPTIMISTIC)
Daniel Balutaf2f79cc2013-07-13 11:26:51 +0300510 override = false;
stephen hemminger9f888162010-06-21 11:00:13 +0000511 inc_opt |= ifp->idev->cnf.force_tllao;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 in6_ifa_put(ifp);
513 } else {
Brian Haley191cd582008-08-14 15:33:21 -0700514 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900515 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900516 &tmpaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return;
518 src_addr = &tmpaddr;
519 }
520
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000521 if (!dev->addr_len)
522 inc_opt = 0;
523 if (inc_opt)
Alexander Aringf997c552016-06-15 21:20:23 +0200524 optlen += ndisc_opt_addr_space(dev,
525 NDISC_NEIGHBOUR_ADVERTISEMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000527 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000528 if (!skb)
529 return;
530
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000531 msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));
532 *msg = (struct nd_msg) {
533 .icmph = {
534 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
535 .icmp6_router = router,
536 .icmp6_solicited = solicited,
537 .icmp6_override = override,
538 },
539 .target = *solicited_addr,
540 };
541
542 if (inc_opt)
543 ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
Alexander Aringf997c552016-06-15 21:20:23 +0200544 dev->dev_addr,
545 NDISC_NEIGHBOUR_ADVERTISEMENT);
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000546
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000547 ndisc_send_skb(skb, daddr, src_addr);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900548}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Ben Hutchingsf47b9462011-04-15 13:46:02 +0000550static void ndisc_send_unsol_na(struct net_device *dev)
551{
552 struct inet6_dev *idev;
553 struct inet6_ifaddr *ifa;
Ben Hutchingsf47b9462011-04-15 13:46:02 +0000554
555 idev = in6_dev_get(dev);
556 if (!idev)
557 return;
558
559 read_lock_bh(&idev->lock);
560 list_for_each_entry(ifa, &idev->addr_list, if_list) {
Jiri Benc38cf5952015-09-22 18:57:13 +0200561 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
Ben Hutchingsf47b9462011-04-15 13:46:02 +0000562 /*router=*/ !!idev->cnf.forwarding,
563 /*solicited=*/ false, /*override=*/ true,
564 /*inc_opt=*/ true);
565 }
566 read_unlock_bh(&idev->lock);
567
568 in6_dev_put(idev);
569}
570
Jiri Benc38cf5952015-09-22 18:57:13 +0200571void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800572 const struct in6_addr *daddr, const struct in6_addr *saddr,
573 u64 nonce)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000575 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 struct in6_addr addr_buf;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000577 int inc_opt = dev->addr_len;
578 int optlen = 0;
579 struct nd_msg *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Ian Morris63159f22015-03-29 14:00:04 +0100581 if (!saddr) {
Neil Horman95c385b2007-04-25 17:08:10 -0700582 if (ipv6_get_lladdr(dev, &addr_buf,
583 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return;
585 saddr = &addr_buf;
586 }
587
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000588 if (ipv6_addr_any(saddr))
Daniel Balutaf2f79cc2013-07-13 11:26:51 +0300589 inc_opt = false;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000590 if (inc_opt)
Alexander Aringf997c552016-06-15 21:20:23 +0200591 optlen += ndisc_opt_addr_space(dev,
592 NDISC_NEIGHBOUR_SOLICITATION);
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800593 if (nonce != 0)
594 optlen += 8;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000595
596 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000597 if (!skb)
598 return;
599
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000600 msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));
601 *msg = (struct nd_msg) {
602 .icmph = {
603 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
604 },
605 .target = *solicit,
606 };
607
608 if (inc_opt)
609 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
Alexander Aringf997c552016-06-15 21:20:23 +0200610 dev->dev_addr,
611 NDISC_NEIGHBOUR_SOLICITATION);
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800612 if (nonce != 0) {
613 u8 *opt = skb_put(skb, 8);
614
615 opt[0] = ND_OPT_NONCE;
616 opt[1] = 8 >> 3;
617 memcpy(opt + 2, &nonce, 6);
618 }
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000619
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000620 ndisc_send_skb(skb, daddr, saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621}
622
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900623void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
624 const struct in6_addr *daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000626 struct sk_buff *skb;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000627 struct rs_msg *msg;
Neil Horman95c385b2007-04-25 17:08:10 -0700628 int send_sllao = dev->addr_len;
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000629 int optlen = 0;
Neil Horman95c385b2007-04-25 17:08:10 -0700630
631#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
632 /*
633 * According to section 2.2 of RFC 4429, we must not
634 * send router solicitations with a sllao from
635 * optimistic addresses, but we may send the solicitation
636 * if we don't include the sllao. So here we check
637 * if our address is optimistic, and if so, we
Joe Perchesbea85192007-12-20 14:01:35 -0800638 * suppress the inclusion of the sllao.
Neil Horman95c385b2007-04-25 17:08:10 -0700639 */
640 if (send_sllao) {
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900641 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
Daniel Lezcano1cab3da2008-01-10 22:44:09 -0800642 dev, 1);
Neil Horman95c385b2007-04-25 17:08:10 -0700643 if (ifp) {
644 if (ifp->flags & IFA_F_OPTIMISTIC) {
YOSHIFUJI Hideakica043562007-02-28 23:13:20 +0900645 send_sllao = 0;
Neil Horman95c385b2007-04-25 17:08:10 -0700646 }
YOSHIFUJI Hideakica043562007-02-28 23:13:20 +0900647 in6_ifa_put(ifp);
Neil Horman95c385b2007-04-25 17:08:10 -0700648 } else {
649 send_sllao = 0;
650 }
651 }
652#endif
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000653 if (send_sllao)
Alexander Aringf997c552016-06-15 21:20:23 +0200654 optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION);
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000655
656 skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000657 if (!skb)
658 return;
659
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000660 msg = (struct rs_msg *)skb_put(skb, sizeof(*msg));
661 *msg = (struct rs_msg) {
662 .icmph = {
663 .icmp6_type = NDISC_ROUTER_SOLICITATION,
664 },
665 };
666
667 if (send_sllao)
668 ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
Alexander Aringf997c552016-06-15 21:20:23 +0200669 dev->dev_addr,
670 NDISC_ROUTER_SOLICITATION);
YOSHIFUJI Hideaki / 吉藤英明1cb3fe52013-01-21 06:49:17 +0000671
YOSHIFUJI Hideaki / 吉藤英明b44b5f42013-01-21 06:49:13 +0000672 ndisc_send_skb(skb, daddr, saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
676static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
677{
678 /*
679 * "The sender MUST return an ICMP
680 * destination unreachable"
681 */
682 dst_link_failure(skb);
683 kfree_skb(skb);
684}
685
686/* Called with locked neigh: either read or both */
687
688static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
689{
690 struct in6_addr *saddr = NULL;
691 struct in6_addr mcaddr;
692 struct net_device *dev = neigh->dev;
693 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
694 int probes = atomic_read(&neigh->probes);
695
Erik Klinec58da4c2015-02-04 20:01:23 +0900696 if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
697 dev, 1,
698 IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700699 saddr = &ipv6_hdr(skb)->saddr;
Ian Morrise5d08d72014-11-23 21:28:43 +0000700 probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
701 if (probes < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (!(neigh->nud_state & NUD_VALID)) {
Joe Perches675418d2012-05-16 19:28:38 +0000703 ND_PRINTK(1, dbg,
704 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
705 __func__, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 }
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800707 ndisc_send_ns(dev, target, target, saddr, 0);
Jiri Pirko1f9248e2013-12-07 19:26:53 +0100708 } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 neigh_app_ns(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 } else {
711 addrconf_addr_solict_mult(target, &mcaddr);
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800712 ndisc_send_ns(dev, target, &mcaddr, saddr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
714}
715
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900716static int pndisc_is_router(const void *pkey,
717 struct net_device *dev)
Pavel Emelyanovfa86d322008-03-24 14:48:59 -0700718{
719 struct pneigh_entry *n;
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900720 int ret = -1;
Pavel Emelyanovfa86d322008-03-24 14:48:59 -0700721
722 read_lock_bh(&nd_tbl.lock);
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900723 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
724 if (n)
725 ret = !!(n->flags & NTF_ROUTER);
Pavel Emelyanovfa86d322008-03-24 14:48:59 -0700726 read_unlock_bh(&nd_tbl.lock);
727
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900728 return ret;
Pavel Emelyanovfa86d322008-03-24 14:48:59 -0700729}
730
Alexander Aringf997c552016-06-15 21:20:23 +0200731void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
732 const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
733 struct ndisc_options *ndopts)
734{
735 neigh_update(neigh, lladdr, new, flags);
736 /* report ndisc ops about neighbour update */
737 ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts);
738}
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740static void ndisc_recv_ns(struct sk_buff *skb)
741{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700742 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000743 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
744 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 u8 *lladdr = NULL;
Simon Horman29a3cad2013-05-28 20:34:26 +0000746 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700747 offsetof(struct nd_msg, opt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 struct ndisc_options ndopts;
749 struct net_device *dev = skb->dev;
750 struct inet6_ifaddr *ifp;
751 struct inet6_dev *idev = NULL;
752 struct neighbour *neigh;
753 int dad = ipv6_addr_any(saddr);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000754 bool inc;
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900755 int is_router = -1;
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800756 u64 nonce = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
YOSHIFUJI Hideaki / 吉藤英明115b0aa2013-01-18 02:05:03 +0000758 if (skb->len < sizeof(struct nd_msg)) {
759 ND_PRINTK(2, warn, "NS: packet too short\n");
760 return;
761 }
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 if (ipv6_addr_is_multicast(&msg->target)) {
Joe Perches675418d2012-05-16 19:28:38 +0000764 ND_PRINTK(2, warn, "NS: multicast target address\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 return;
766 }
767
768 /*
769 * RFC2461 7.1.1:
770 * DAD has to be destined for solicited node multicast address.
771 */
YOSHIFUJI Hideaki / 吉藤英明ca97a642013-01-20 07:39:00 +0000772 if (dad && !ipv6_addr_is_solict_mult(daddr)) {
Joe Perches675418d2012-05-16 19:28:38 +0000773 ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 return;
775 }
776
Alexander Aringf997c552016-06-15 21:20:23 +0200777 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
Joe Perches675418d2012-05-16 19:28:38 +0000778 ND_PRINTK(2, warn, "NS: invalid ND options\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 return;
780 }
781
782 if (ndopts.nd_opts_src_lladdr) {
783 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
784 if (!lladdr) {
Joe Perches675418d2012-05-16 19:28:38 +0000785 ND_PRINTK(2, warn,
786 "NS: invalid link-layer address length\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 return;
788 }
789
790 /* RFC2461 7.1.1:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900791 * If the IP source address is the unspecified address,
792 * there MUST NOT be source link-layer address option
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 * in the message.
794 */
795 if (dad) {
Joe Perches675418d2012-05-16 19:28:38 +0000796 ND_PRINTK(2, warn,
797 "NS: bad DAD packet (link-layer address option)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 return;
799 }
800 }
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800801 if (ndopts.nd_opts_nonce)
802 memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
804 inc = ipv6_addr_is_multicast(daddr);
805
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900806 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
Daniel Lezcanoa18bc692008-03-07 11:14:49 -0800807 if (ifp) {
David Ahernca254492015-10-12 11:47:10 -0700808have_ifp:
Neil Horman95c385b2007-04-25 17:08:10 -0700809 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
810 if (dad) {
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800811 if (nonce != 0 && ifp->dad_nonce == nonce) {
812 u8 *np = (u8 *)&nonce;
813 /* Matching nonce if looped back */
814 ND_PRINTK(2, notice,
815 "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n",
816 ifp->idev->dev->name,
817 &ifp->addr, np);
818 goto out;
819 }
Neil Horman95c385b2007-04-25 17:08:10 -0700820 /*
821 * We are colliding with another node
822 * who is doing DAD
823 * so fail our DAD process
824 */
825 addrconf_dad_failure(ifp);
Denis V. Lunev9e3be4b2007-09-11 11:04:49 +0200826 return;
Neil Horman95c385b2007-04-25 17:08:10 -0700827 } else {
828 /*
829 * This is not a dad solicitation.
830 * If we are an optimistic node,
831 * we should respond.
832 * Otherwise, we should ignore it.
833 */
834 if (!(ifp->flags & IFA_F_OPTIMISTIC))
835 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 }
838
839 idev = ifp->idev;
840 } else {
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -0700841 struct net *net = dev_net(dev);
842
David Ahernca254492015-10-12 11:47:10 -0700843 /* perhaps an address on the master device */
844 if (netif_is_l3_slave(dev)) {
845 struct net_device *mdev;
846
847 mdev = netdev_master_upper_dev_get_rcu(dev);
848 if (mdev) {
849 ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1);
850 if (ifp)
851 goto have_ifp;
852 }
853 }
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 idev = in6_dev_get(dev);
856 if (!idev) {
857 /* XXX: count this drop? */
858 return;
859 }
860
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -0700861 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900862 (idev->cnf.forwarding &&
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -0700863 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900864 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
Patrick McHardya61bbcf2005-08-14 17:24:31 -0700865 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 skb->pkt_type != PACKET_HOST &&
Daniel Balutaf2f79cc2013-07-13 11:26:51 +0300867 inc &&
Jiri Pirko1f9248e2013-12-07 19:26:53 +0100868 NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 /*
870 * for anycast or proxy,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900871 * sender should delay its response
872 * by a random time between 0 and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 * MAX_ANYCAST_DELAY_TIME seconds.
874 * (RFC2461) -- yoshfuji
875 */
876 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
877 if (n)
878 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
879 goto out;
880 }
881 } else
882 goto out;
883 }
884
YOSHIFUJI Hideaki0736ffc2008-03-28 13:37:58 +0900885 if (is_router < 0)
YOSHIFUJI Hideaki / 吉藤英明fb568632013-01-20 07:39:18 +0000886 is_router = idev->cnf.forwarding;
Ville Nuorvala62dd9312006-09-22 14:43:19 -0700887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 if (dad) {
Jiri Benc38cf5952015-09-22 18:57:13 +0200889 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
YOSHIFUJI Hideaki / 吉藤英明fb568632013-01-20 07:39:18 +0000890 !!is_router, false, (ifp != NULL), true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 goto out;
892 }
893
894 if (inc)
895 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
896 else
897 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
898
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900899 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 * update / create cache entry
901 * for the source address
902 */
903 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
904 !inc || lladdr || !dev->addr_len);
905 if (neigh)
Alexander Aringf997c552016-06-15 21:20:23 +0200906 ndisc_update(dev, neigh, lladdr, NUD_STALE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 NEIGH_UPDATE_F_WEAK_OVERRIDE|
Alexander Aringf997c552016-06-15 21:20:23 +0200908 NEIGH_UPDATE_F_OVERRIDE,
909 NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700910 if (neigh || !dev->header_ops) {
Jiri Benc38cf5952015-09-22 18:57:13 +0200911 ndisc_send_na(dev, saddr, &msg->target, !!is_router,
YOSHIFUJI Hideaki / 吉藤英明fb568632013-01-20 07:39:18 +0000912 true, (ifp != NULL && inc), inc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 if (neigh)
914 neigh_release(neigh);
915 }
916
917out:
918 if (ifp)
919 in6_ifa_put(ifp);
920 else
921 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
924static void ndisc_recv_na(struct sk_buff *skb)
925{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700926 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
Duan Jiongbe7a0102014-05-15 15:56:14 +0800927 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000928 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 u8 *lladdr = NULL;
Simon Horman29a3cad2013-05-28 20:34:26 +0000930 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700931 offsetof(struct nd_msg, opt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 struct ndisc_options ndopts;
933 struct net_device *dev = skb->dev;
Johannes Berg7a02bf82016-02-04 13:31:20 +0100934 struct inet6_dev *idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 struct inet6_ifaddr *ifp;
936 struct neighbour *neigh;
937
938 if (skb->len < sizeof(struct nd_msg)) {
Joe Perches675418d2012-05-16 19:28:38 +0000939 ND_PRINTK(2, warn, "NA: packet too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 return;
941 }
942
943 if (ipv6_addr_is_multicast(&msg->target)) {
Joe Perches675418d2012-05-16 19:28:38 +0000944 ND_PRINTK(2, warn, "NA: target address is multicast\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 return;
946 }
947
948 if (ipv6_addr_is_multicast(daddr) &&
949 msg->icmph.icmp6_solicited) {
Joe Perches675418d2012-05-16 19:28:38 +0000950 ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 return;
952 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900953
Johannes Berg7a02bf82016-02-04 13:31:20 +0100954 /* For some 802.11 wireless deployments (and possibly other networks),
955 * there will be a NA proxy and unsolicitd packets are attacks
956 * and thus should not be accepted.
957 */
958 if (!msg->icmph.icmp6_solicited && idev &&
959 idev->cnf.drop_unsolicited_na)
960 return;
961
Alexander Aringf997c552016-06-15 21:20:23 +0200962 if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
Joe Perches675418d2012-05-16 19:28:38 +0000963 ND_PRINTK(2, warn, "NS: invalid ND option\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 return;
965 }
966 if (ndopts.nd_opts_tgt_lladdr) {
967 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
968 if (!lladdr) {
Joe Perches675418d2012-05-16 19:28:38 +0000969 ND_PRINTK(2, warn,
970 "NA: invalid link-layer address length\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 return;
972 }
973 }
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900974 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
Daniel Lezcanoa18bc692008-03-07 11:14:49 -0800975 if (ifp) {
Daniel Walterbd015922011-04-13 21:09:25 +0000976 if (skb->pkt_type != PACKET_LOOPBACK
977 && (ifp->flags & IFA_F_TENTATIVE)) {
978 addrconf_dad_failure(ifp);
979 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 }
981 /* What should we make now? The advertisement
982 is invalid, but ndisc specs say nothing
983 about it. It could be misconfiguration, or
984 an smart proxy agent tries to help us :-)
Jan Sembera24fc7b82008-12-09 15:48:32 -0800985
986 We should not print the error if NA has been
987 received from loopback - it is just our own
988 unsolicited advertisement.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 */
Jan Sembera24fc7b82008-12-09 15:48:32 -0800990 if (skb->pkt_type != PACKET_LOOPBACK)
Joe Perches675418d2012-05-16 19:28:38 +0000991 ND_PRINTK(1, warn,
992 "NA: someone advertises our address %pI6 on %s!\n",
993 &ifp->addr, ifp->idev->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 in6_ifa_put(ifp);
995 return;
996 }
997 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
998
999 if (neigh) {
1000 u8 old_flags = neigh->flags;
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -07001001 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
1003 if (neigh->nud_state & NUD_FAILED)
1004 goto out;
1005
Ville Nuorvala5f3e6e92006-09-22 14:42:46 -07001006 /*
1007 * Don't update the neighbor cache entry on a proxy NA from
1008 * ourselves because either the proxied node is off link or it
1009 * has already sent a NA to us.
1010 */
1011 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -07001012 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
1013 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
Nicolas Dichtelb20b6d92012-11-07 05:05:38 +00001014 /* XXX: idev->cnf.proxy_ndp */
Ville Nuorvala5f3e6e92006-09-22 14:42:46 -07001015 goto out;
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -07001016 }
Ville Nuorvala5f3e6e92006-09-22 14:42:46 -07001017
Alexander Aringf997c552016-06-15 21:20:23 +02001018 ndisc_update(dev, neigh, lladdr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
1020 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1021 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
1022 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
Alexander Aringf997c552016-06-15 21:20:23 +02001023 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0),
1024 NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
1026 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
1027 /*
1028 * Change: router to host
1029 */
Duan Jiongbe7a0102014-05-15 15:56:14 +08001030 rt6_clean_tohost(dev_net(dev), saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032
1033out:
1034 neigh_release(neigh);
1035 }
1036}
1037
1038static void ndisc_recv_rs(struct sk_buff *skb)
1039{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -07001040 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1042 struct neighbour *neigh;
1043 struct inet6_dev *idev;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001044 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 struct ndisc_options ndopts;
1046 u8 *lladdr = NULL;
1047
1048 if (skb->len < sizeof(*rs_msg))
1049 return;
1050
Eric Dumazetcfdf7642011-07-27 21:13:03 +00001051 idev = __in6_dev_get(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 if (!idev) {
Joe Perches675418d2012-05-16 19:28:38 +00001053 ND_PRINTK(1, err, "RS: can't find in6 device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 return;
1055 }
1056
1057 /* Don't accept RS if we're not in router mode */
1058 if (!idev->cnf.forwarding)
1059 goto out;
1060
1061 /*
1062 * Don't update NCE if src = ::;
1063 * this implies that the source node has no ip address assigned yet.
1064 */
1065 if (ipv6_addr_any(saddr))
1066 goto out;
1067
1068 /* Parse ND options */
Alexander Aringf997c552016-06-15 21:20:23 +02001069 if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) {
Joe Perches675418d2012-05-16 19:28:38 +00001070 ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 goto out;
1072 }
1073
1074 if (ndopts.nd_opts_src_lladdr) {
1075 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1076 skb->dev);
1077 if (!lladdr)
1078 goto out;
1079 }
1080
1081 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1082 if (neigh) {
Alexander Aringf997c552016-06-15 21:20:23 +02001083 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1085 NEIGH_UPDATE_F_OVERRIDE|
Alexander Aringf997c552016-06-15 21:20:23 +02001086 NEIGH_UPDATE_F_OVERRIDE_ISROUTER,
1087 NDISC_ROUTER_SOLICITATION, &ndopts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 neigh_release(neigh);
1089 }
1090out:
Eric Dumazetcfdf7642011-07-27 21:13:03 +00001091 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092}
1093
Pierre Ynard31910572007-10-10 21:22:05 -07001094static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1095{
1096 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1097 struct sk_buff *skb;
1098 struct nlmsghdr *nlh;
1099 struct nduseroptmsg *ndmsg;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001100 struct net *net = dev_net(ra->dev);
Pierre Ynard31910572007-10-10 21:22:05 -07001101 int err;
1102 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1103 + (opt->nd_opt_len << 3));
1104 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1105
1106 skb = nlmsg_new(msg_size, GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01001107 if (!skb) {
Pierre Ynard31910572007-10-10 21:22:05 -07001108 err = -ENOBUFS;
1109 goto errout;
1110 }
1111
1112 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001113 if (!nlh) {
Pierre Ynard31910572007-10-10 21:22:05 -07001114 goto nla_put_failure;
1115 }
1116
1117 ndmsg = nlmsg_data(nlh);
1118 ndmsg->nduseropt_family = AF_INET6;
Pierre Ynarddbb2ed22007-11-12 17:58:35 -08001119 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
Pierre Ynard31910572007-10-10 21:22:05 -07001120 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1121 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1122 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1123
1124 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1125
Jiri Benc930345e2015-03-29 16:59:25 +02001126 if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))
David S. Millerc78679e2012-04-01 20:27:33 -04001127 goto nla_put_failure;
Pierre Ynard31910572007-10-10 21:22:05 -07001128 nlmsg_end(skb, nlh);
1129
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08001130 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
Pierre Ynard31910572007-10-10 21:22:05 -07001131 return;
1132
1133nla_put_failure:
1134 nlmsg_free(skb);
1135 err = -EMSGSIZE;
1136errout:
Daniel Lezcanoa18bc692008-03-07 11:14:49 -08001137 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
Pierre Ynard31910572007-10-10 21:22:05 -07001138}
1139
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140static void ndisc_router_discovery(struct sk_buff *skb)
1141{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -07001142 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 struct neighbour *neigh = NULL;
1144 struct inet6_dev *in6_dev;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08001145 struct rt6_info *rt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 int lifetime;
1147 struct ndisc_options ndopts;
1148 int optlen;
YOSHIFUJI Hideakiebacaaa2006-03-20 17:04:53 -08001149 unsigned int pref = 0;
Marius Tomaschewskia394eef2015-08-31 15:59:22 +02001150 __u32 old_if_flags;
Marius Tomaschewski2053aeb2015-09-01 01:57:30 +02001151 bool send_ifinfo_notify = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
Ian Morris67ba4152014-08-24 21:53:10 +01001153 __u8 *opt = (__u8 *)(ra_msg + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
Simon Horman29a3cad2013-05-28 20:34:26 +00001155 optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
1156 sizeof(struct ra_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Ben Greearf2a762d2014-06-25 14:44:52 -07001158 ND_PRINTK(2, info,
1159 "RA: %s, dev: %s\n",
1160 __func__, skb->dev->name);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001161 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
Joe Perches675418d2012-05-16 19:28:38 +00001162 ND_PRINTK(2, warn, "RA: source address is not link-local\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 return;
1164 }
1165 if (optlen < 0) {
Joe Perches675418d2012-05-16 19:28:38 +00001166 ND_PRINTK(2, warn, "RA: packet too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 return;
1168 }
1169
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001170#ifdef CONFIG_IPV6_NDISC_NODETYPE
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001171 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
Joe Perches675418d2012-05-16 19:28:38 +00001172 ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001173 return;
1174 }
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001175#endif
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001176
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 /*
1178 * set the RA_RECV flag in the interface
1179 */
1180
Eric Dumazetcfdf7642011-07-27 21:13:03 +00001181 in6_dev = __in6_dev_get(skb->dev);
Ian Morris63159f22015-03-29 14:00:04 +01001182 if (!in6_dev) {
Joe Perches675418d2012-05-16 19:28:38 +00001183 ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
1184 skb->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 return;
1186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
Alexander Aringf997c552016-06-15 21:20:23 +02001188 if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
Joe Perches675418d2012-05-16 19:28:38 +00001189 ND_PRINTK(2, warn, "RA: invalid ND options\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 return;
1191 }
1192
Ben Greearf2a762d2014-06-25 14:44:52 -07001193 if (!ipv6_accept_ra(in6_dev)) {
1194 ND_PRINTK(2, info,
1195 "RA: %s, did not accept ra for dev: %s\n",
1196 __func__, skb->dev->name);
David Ward31ce8c72009-08-29 00:04:09 -07001197 goto skip_linkparms;
Ben Greearf2a762d2014-06-25 14:44:52 -07001198 }
David Ward31ce8c72009-08-29 00:04:09 -07001199
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001200#ifdef CONFIG_IPV6_NDISC_NODETYPE
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001201 /* skip link-specific parameters from interior routers */
Ben Greearf2a762d2014-06-25 14:44:52 -07001202 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1203 ND_PRINTK(2, info,
1204 "RA: %s, nodetype is NODEFAULT, dev: %s\n",
1205 __func__, skb->dev->name);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001206 goto skip_linkparms;
Ben Greearf2a762d2014-06-25 14:44:52 -07001207 }
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001208#endif
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001209
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 if (in6_dev->if_flags & IF_RS_SENT) {
1211 /*
1212 * flag that an RA was received after an RS was sent
1213 * out on this interface.
1214 */
1215 in6_dev->if_flags |= IF_RA_RCVD;
1216 }
1217
1218 /*
1219 * Remember the managed/otherconf flags from most recently
1220 * received RA message (RFC 2462) -- yoshfuji
1221 */
Marius Tomaschewskia394eef2015-08-31 15:59:22 +02001222 old_if_flags = in6_dev->if_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1224 IF_RA_OTHERCONF)) |
1225 (ra_msg->icmph.icmp6_addrconf_managed ?
1226 IF_RA_MANAGED : 0) |
1227 (ra_msg->icmph.icmp6_addrconf_other ?
1228 IF_RA_OTHERCONF : 0);
1229
Marius Tomaschewskia394eef2015-08-31 15:59:22 +02001230 if (old_if_flags != in6_dev->if_flags)
Marius Tomaschewski2053aeb2015-09-01 01:57:30 +02001231 send_ifinfo_notify = true;
Marius Tomaschewskia394eef2015-08-31 15:59:22 +02001232
Ben Greearf2a762d2014-06-25 14:44:52 -07001233 if (!in6_dev->cnf.accept_ra_defrtr) {
1234 ND_PRINTK(2, info,
1235 "RA: %s, defrtr is false for dev: %s\n",
1236 __func__, skb->dev->name);
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08001237 goto skip_defrtr;
Ben Greearf2a762d2014-06-25 14:44:52 -07001238 }
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08001239
Ben Greeard9333192014-06-25 14:44:53 -07001240 /* Do not accept RA with source-addr found on local machine unless
1241 * accept_ra_from_local is set to true.
1242 */
Li RongQingb6428812014-07-10 18:02:46 +08001243 if (!in6_dev->cnf.accept_ra_from_local &&
1244 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
Hannes Frederic Sowac1a9a292015-12-23 22:44:37 +01001245 in6_dev->dev, 0)) {
Ben Greearf2a762d2014-06-25 14:44:52 -07001246 ND_PRINTK(2, info,
Ben Greeard9333192014-06-25 14:44:53 -07001247 "RA from local address detected on dev: %s: default router ignored\n",
1248 skb->dev->name);
Andreas Hofmeister9f562202011-10-24 19:13:15 -04001249 goto skip_defrtr;
Ben Greearf2a762d2014-06-25 14:44:52 -07001250 }
Andreas Hofmeister9f562202011-10-24 19:13:15 -04001251
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1253
YOSHIFUJI Hideakiebacaaa2006-03-20 17:04:53 -08001254#ifdef CONFIG_IPV6_ROUTER_PREF
1255 pref = ra_msg->icmph.icmp6_router_pref;
1256 /* 10b is handled as if it were 00b (medium) */
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08001257 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
YOSHIFUJI Hideaki6d5b78c2007-06-22 16:07:04 -07001258 !in6_dev->cnf.accept_ra_rtr_pref)
YOSHIFUJI Hideakiebacaaa2006-03-20 17:04:53 -08001259 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1260#endif
1261
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001262 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263
David S. Millereb857182012-01-27 15:07:56 -08001264 if (rt) {
1265 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
1266 if (!neigh) {
Joe Perches675418d2012-05-16 19:28:38 +00001267 ND_PRINTK(0, err,
1268 "RA: %s got default router without neighbour\n",
1269 __func__);
Amerigo Wang94e187c2012-10-29 00:13:19 +00001270 ip6_rt_put(rt);
David S. Millereb857182012-01-27 15:07:56 -08001271 return;
1272 }
1273 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 if (rt && lifetime == 0) {
Thomas Grafe0a1ad732006-08-22 00:00:21 -07001275 ip6_del_rt(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 rt = NULL;
1277 }
1278
Ben Greearf2a762d2014-06-25 14:44:52 -07001279 ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n",
1280 rt, lifetime, skb->dev->name);
Ian Morris63159f22015-03-29 14:00:04 +01001281 if (!rt && lifetime) {
Ben Greearf2a762d2014-06-25 14:44:52 -07001282 ND_PRINTK(3, info, "RA: adding default router\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001284 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
Ian Morris63159f22015-03-29 14:00:04 +01001285 if (!rt) {
Joe Perches675418d2012-05-16 19:28:38 +00001286 ND_PRINTK(0, err,
1287 "RA: %s failed to add default route\n",
1288 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 return;
1290 }
1291
David S. Millereb857182012-01-27 15:07:56 -08001292 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
Ian Morris63159f22015-03-29 14:00:04 +01001293 if (!neigh) {
Joe Perches675418d2012-05-16 19:28:38 +00001294 ND_PRINTK(0, err,
1295 "RA: %s got default router without neighbour\n",
1296 __func__);
Amerigo Wang94e187c2012-10-29 00:13:19 +00001297 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 return;
1299 }
1300 neigh->flags |= NTF_ROUTER;
YOSHIFUJI Hideakiebacaaa2006-03-20 17:04:53 -08001301 } else if (rt) {
Pedro Ribeiro22441cf2008-10-15 15:47:49 -07001302 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 }
1304
1305 if (rt)
Gao feng1716a962012-04-06 00:13:10 +00001306 rt6_set_expires(rt, jiffies + (HZ * lifetime));
Hangbin Liu8013d1d2015-07-30 14:28:42 +08001307 if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
1308 ra_msg->icmph.icmp6_hop_limit) {
1309 if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
D.S. Ljungmark6fd99092015-03-25 09:28:15 +01001310 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
Hangbin Liu8013d1d2015-07-30 14:28:42 +08001311 if (rt)
1312 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1313 ra_msg->icmph.icmp6_hop_limit);
D.S. Ljungmark6fd99092015-03-25 09:28:15 +01001314 } else {
Hangbin Liu8013d1d2015-07-30 14:28:42 +08001315 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
D.S. Ljungmark6fd99092015-03-25 09:28:15 +01001316 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 }
1318
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08001319skip_defrtr:
1320
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 /*
1322 * Update Reachable Time and Retrans Timer
1323 */
1324
1325 if (in6_dev->nd_parms) {
1326 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1327
1328 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1329 rtime = (rtime*HZ)/1000;
1330 if (rtime < HZ/10)
1331 rtime = HZ/10;
Jiri Pirko1f9248e2013-12-07 19:26:53 +01001332 NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 in6_dev->tstamp = jiffies;
Marius Tomaschewski2053aeb2015-09-01 01:57:30 +02001334 send_ifinfo_notify = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 }
1336
1337 rtime = ntohl(ra_msg->reachable_time);
1338 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1339 rtime = (rtime*HZ)/1000;
1340
1341 if (rtime < HZ/10)
1342 rtime = HZ/10;
1343
Jiri Pirko1f9248e2013-12-07 19:26:53 +01001344 if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) {
1345 NEIGH_VAR_SET(in6_dev->nd_parms,
1346 BASE_REACHABLE_TIME, rtime);
1347 NEIGH_VAR_SET(in6_dev->nd_parms,
1348 GC_STALETIME, 3 * rtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1350 in6_dev->tstamp = jiffies;
Marius Tomaschewski2053aeb2015-09-01 01:57:30 +02001351 send_ifinfo_notify = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 }
1353 }
1354 }
1355
Marius Tomaschewski2053aeb2015-09-01 01:57:30 +02001356 /*
1357 * Send a notify if RA changed managed/otherconf flags or timer settings
1358 */
1359 if (send_ifinfo_notify)
1360 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1361
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001362skip_linkparms:
1363
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 /*
1365 * Process options.
1366 */
1367
1368 if (!neigh)
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001369 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 skb->dev, 1);
1371 if (neigh) {
1372 u8 *lladdr = NULL;
1373 if (ndopts.nd_opts_src_lladdr) {
1374 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1375 skb->dev);
1376 if (!lladdr) {
Joe Perches675418d2012-05-16 19:28:38 +00001377 ND_PRINTK(2, warn,
1378 "RA: invalid link-layer address length\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 goto out;
1380 }
1381 }
Alexander Aringf997c552016-06-15 21:20:23 +02001382 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1384 NEIGH_UPDATE_F_OVERRIDE|
1385 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
Alexander Aringf997c552016-06-15 21:20:23 +02001386 NEIGH_UPDATE_F_ISROUTER,
1387 NDISC_ROUTER_ADVERTISEMENT, &ndopts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 }
1389
Ben Greearf2a762d2014-06-25 14:44:52 -07001390 if (!ipv6_accept_ra(in6_dev)) {
1391 ND_PRINTK(2, info,
1392 "RA: %s, accept_ra is false for dev: %s\n",
1393 __func__, skb->dev->name);
David Ward31ce8c72009-08-29 00:04:09 -07001394 goto out;
Ben Greearf2a762d2014-06-25 14:44:52 -07001395 }
David Ward31ce8c72009-08-29 00:04:09 -07001396
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -08001397#ifdef CONFIG_IPV6_ROUTE_INFO
Li RongQingb6428812014-07-10 18:02:46 +08001398 if (!in6_dev->cnf.accept_ra_from_local &&
1399 ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
Hannes Frederic Sowac1a9a292015-12-23 22:44:37 +01001400 in6_dev->dev, 0)) {
Ben Greearf2a762d2014-06-25 14:44:52 -07001401 ND_PRINTK(2, info,
Ben Greeard9333192014-06-25 14:44:53 -07001402 "RA from local address detected on dev: %s: router info ignored.\n",
1403 skb->dev->name);
Andreas Hofmeister9f562202011-10-24 19:13:15 -04001404 goto skip_routeinfo;
Ben Greearf2a762d2014-06-25 14:44:52 -07001405 }
Andreas Hofmeister9f562202011-10-24 19:13:15 -04001406
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08001407 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -08001408 struct nd_opt_hdr *p;
1409 for (p = ndopts.nd_opts_ri;
1410 p;
1411 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
YOSHIFUJI Hideaki6294e002008-03-15 23:56:52 -04001412 struct route_info *ri = (struct route_info *)p;
1413#ifdef CONFIG_IPV6_NDISC_NODETYPE
1414 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1415 ri->prefix_len == 0)
1416 continue;
1417#endif
Duan Jiong30e56912013-11-26 15:46:56 +08001418 if (ri->prefix_len == 0 &&
1419 !in6_dev->cnf.accept_ra_defrtr)
1420 continue;
YOSHIFUJI Hideaki6294e002008-03-15 23:56:52 -04001421 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08001422 continue;
Ian Morris67ba4152014-08-24 21:53:10 +01001423 rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001424 &ipv6_hdr(skb)->saddr);
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -08001425 }
1426 }
Andreas Hofmeister9f562202011-10-24 19:13:15 -04001427
1428skip_routeinfo:
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -08001429#endif
1430
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001431#ifdef CONFIG_IPV6_NDISC_NODETYPE
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001432 /* skip link-specific ndopts from interior routers */
Ben Greearf2a762d2014-06-25 14:44:52 -07001433 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
1434 ND_PRINTK(2, info,
1435 "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
1436 __func__, skb->dev->name);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001437 goto out;
Ben Greearf2a762d2014-06-25 14:44:52 -07001438 }
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001439#endif
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001440
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -08001441 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 struct nd_opt_hdr *p;
1443 for (p = ndopts.nd_opts_pi;
1444 p;
1445 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
Neil Hormane6bff992012-01-04 10:49:15 +00001446 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1447 (p->nd_opt_len) << 3,
1448 ndopts.nd_opts_src_lladdr != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 }
1450 }
1451
Harout Hedeshianc2943f12015-01-20 10:06:05 -07001452 if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) {
Al Viroe69a4ad2006-11-14 20:56:00 -08001453 __be32 n;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 u32 mtu;
1455
Ian Morris67ba4152014-08-24 21:53:10 +01001456 memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
Al Viroe69a4ad2006-11-14 20:56:00 -08001457 mtu = ntohl(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
1459 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
Joe Perches675418d2012-05-16 19:28:38 +00001460 ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 } else if (in6_dev->cnf.mtu6 != mtu) {
1462 in6_dev->cnf.mtu6 = mtu;
1463
1464 if (rt)
David S. Millerdefb3512010-12-08 21:16:57 -08001465 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
1467 rt6_mtu_change(skb->dev, mtu);
1468 }
1469 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001470
Pierre Ynard31910572007-10-10 21:22:05 -07001471 if (ndopts.nd_useropts) {
YOSHIFUJI Hideaki61cf46ad2008-01-22 17:32:53 +09001472 struct nd_opt_hdr *p;
1473 for (p = ndopts.nd_useropts;
1474 p;
Alexander Aringf997c552016-06-15 21:20:23 +02001475 p = ndisc_next_useropt(skb->dev, p,
1476 ndopts.nd_useropts_end)) {
YOSHIFUJI Hideaki61cf46ad2008-01-22 17:32:53 +09001477 ndisc_ra_useropt(skb, p);
Pierre Ynard31910572007-10-10 21:22:05 -07001478 }
1479 }
1480
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
Joe Perches675418d2012-05-16 19:28:38 +00001482 ND_PRINTK(2, warn, "RA: invalid RA options\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 }
1484out:
Amerigo Wang94e187c2012-10-29 00:13:19 +00001485 ip6_rt_put(rt);
David S. Millereb857182012-01-27 15:07:56 -08001486 if (neigh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 neigh_release(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488}
1489
1490static void ndisc_redirect_rcv(struct sk_buff *skb)
1491{
Duan Jiong093d04d2012-12-14 02:59:59 +00001492 u8 *hdr;
1493 struct ndisc_options ndopts;
1494 struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
Simon Horman29a3cad2013-05-28 20:34:26 +00001495 u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
Duan Jiong093d04d2012-12-14 02:59:59 +00001496 offsetof(struct rd_msg, opt));
1497
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001498#ifdef CONFIG_IPV6_NDISC_NODETYPE
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001499 switch (skb->ndisc_nodetype) {
1500 case NDISC_NODETYPE_HOST:
1501 case NDISC_NODETYPE_NODEFAULT:
Joe Perches675418d2012-05-16 19:28:38 +00001502 ND_PRINTK(2, warn,
1503 "Redirect: from host or unauthorized router\n");
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001504 return;
1505 }
YOSHIFUJI Hideakide357cc2008-03-15 23:59:18 -04001506#endif
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001507
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001508 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
Joe Perches675418d2012-05-16 19:28:38 +00001509 ND_PRINTK(2, warn,
1510 "Redirect: source address is not link-local\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 return;
1512 }
1513
Alexander Aringf997c552016-06-15 21:20:23 +02001514 if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
Duan Jiong093d04d2012-12-14 02:59:59 +00001515 return;
1516
Duan Jiongc92a59e2013-08-22 12:07:35 +08001517 if (!ndopts.nd_opts_rh) {
Duan Jiongb55b76b2013-09-04 19:44:21 +08001518 ip6_redirect_no_header(skb, dev_net(skb->dev),
1519 skb->dev->ifindex, 0);
Duan Jiong093d04d2012-12-14 02:59:59 +00001520 return;
Duan Jiongc92a59e2013-08-22 12:07:35 +08001521 }
Duan Jiong093d04d2012-12-14 02:59:59 +00001522
1523 hdr = (u8 *)ndopts.nd_opts_rh;
1524 hdr += 8;
1525 if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
1526 return;
1527
David S. Millerb94f1c02012-07-12 00:33:37 -07001528 icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529}
1530
YOSHIFUJI Hideaki / 吉藤英明5f5a0112013-01-21 06:48:53 +00001531static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
1532 struct sk_buff *orig_skb,
1533 int rd_len)
YOSHIFUJI Hideaki / 吉藤英明9c86daf2013-01-21 06:48:09 +00001534{
YOSHIFUJI Hideaki / 吉藤英明5f5a0112013-01-21 06:48:53 +00001535 u8 *opt = skb_put(skb, rd_len);
1536
YOSHIFUJI Hideaki / 吉藤英明9c86daf2013-01-21 06:48:09 +00001537 memset(opt, 0, 8);
1538 *(opt++) = ND_OPT_REDIRECT_HDR;
1539 *(opt++) = (rd_len >> 3);
1540 opt += 6;
1541
1542 memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8);
YOSHIFUJI Hideaki / 吉藤英明9c86daf2013-01-21 06:48:09 +00001543}
1544
David S. Miller49919692012-01-27 15:30:48 -08001545void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546{
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001547 struct net_device *dev = skb->dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001548 struct net *net = dev_net(dev);
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001549 struct sock *sk = net->ipv6.ndisc_sk;
YOSHIFUJI Hideaki / 吉藤英明2ce135762013-01-21 06:48:49 +00001550 int optlen = 0;
David S. Millerfbfe95a2012-06-08 23:24:18 -07001551 struct inet_peer *peer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 struct sk_buff *buff;
YOSHIFUJI Hideaki / 吉藤英明71bcdba2013-01-05 16:34:51 +00001553 struct rd_msg *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 struct in6_addr saddr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 struct rt6_info *rt;
1556 struct dst_entry *dst;
David S. Miller4c9483b2011-03-12 16:22:43 -05001557 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 int rd_len;
Alexander Aringf997c552016-06-15 21:20:23 +02001559 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL,
1560 ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL;
David S. Miller1d861aa2012-07-10 03:58:16 -07001561 bool ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
Neil Horman95c385b2007-04-25 17:08:10 -07001563 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
Joe Perches675418d2012-05-16 19:28:38 +00001564 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
1565 dev->name);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001566 return;
1567 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001569 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
Brian Haleybf0b48d2007-10-08 00:12:05 -07001570 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
Joe Perches675418d2012-05-16 19:28:38 +00001571 ND_PRINTK(2, warn,
1572 "Redirect: target address is not link-local unicast\n");
Li Yewang29556522007-01-30 14:33:20 -08001573 return;
1574 }
1575
David S. Miller4c9483b2011-03-12 16:22:43 -05001576 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
David Aherne0d56fd2016-09-10 12:09:57 -07001577 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
David S. Miller4c9483b2011-03-12 16:22:43 -05001579 dst = ip6_route_output(net, NULL, &fl6);
RongQing.Li5095d642012-02-21 22:10:49 +00001580 if (dst->error) {
1581 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 return;
RongQing.Li5095d642012-02-21 22:10:49 +00001583 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001584 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
David S. Miller452edd52011-03-02 13:27:41 -08001585 if (IS_ERR(dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587
1588 rt = (struct rt6_info *) dst;
1589
1590 if (rt->rt6i_flags & RTF_GATEWAY) {
Joe Perches675418d2012-05-16 19:28:38 +00001591 ND_PRINTK(2, warn,
1592 "Redirect: destination is not a neighbour\n");
Ilpo Järvinend73f0802009-02-06 23:47:37 -08001593 goto release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 }
Martin KaFai Laufd0273d2015-05-22 20:55:57 -07001595 peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1);
David S. Miller1d861aa2012-07-10 03:58:16 -07001596 ret = inet_peer_xrlim_allow(peer, 1*HZ);
1597 if (peer)
1598 inet_putpeer(peer);
1599 if (!ret)
Ilpo Järvinend73f0802009-02-06 23:47:37 -08001600 goto release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
1602 if (dev->addr_len) {
David S. Miller49919692012-01-27 15:30:48 -08001603 struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
1604 if (!neigh) {
Joe Perches675418d2012-05-16 19:28:38 +00001605 ND_PRINTK(2, warn,
1606 "Redirect: no neigh for target address\n");
David S. Miller49919692012-01-27 15:30:48 -08001607 goto release;
1608 }
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 read_lock_bh(&neigh->lock);
1611 if (neigh->nud_state & NUD_VALID) {
1612 memcpy(ha_buf, neigh->ha, dev->addr_len);
1613 read_unlock_bh(&neigh->lock);
1614 ha = ha_buf;
Alexander Aringf997c552016-06-15 21:20:23 +02001615 optlen += ndisc_redirect_opt_addr_space(dev, neigh,
1616 ops_data_buf,
1617 &ops_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 } else
1619 read_unlock_bh(&neigh->lock);
David S. Miller49919692012-01-27 15:30:48 -08001620
1621 neigh_release(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 }
1623
1624 rd_len = min_t(unsigned int,
YOSHIFUJI Hideaki / 吉藤英明2ce135762013-01-21 06:48:49 +00001625 IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
1626 skb->len + 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 rd_len &= ~0x7;
YOSHIFUJI Hideaki / 吉藤英明2ce135762013-01-21 06:48:49 +00001628 optlen += rd_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629
YOSHIFUJI Hideaki / 吉藤英明2ce135762013-01-21 06:48:49 +00001630 buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
YOSHIFUJI Hideaki / 吉藤英明de093342013-01-21 06:48:14 +00001631 if (!buff)
Ilpo Järvinend73f0802009-02-06 23:47:37 -08001632 goto release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633
YOSHIFUJI Hideaki / 吉藤英明4d5c1522013-01-21 06:49:25 +00001634 msg = (struct rd_msg *)skb_put(buff, sizeof(*msg));
1635 *msg = (struct rd_msg) {
1636 .icmph = {
1637 .icmp6_type = NDISC_REDIRECT,
1638 },
1639 .target = *target,
1640 .dest = ipv6_hdr(skb)->daddr,
1641 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 /*
1644 * include target_address option
1645 */
1646
1647 if (ha)
Alexander Aringf997c552016-06-15 21:20:23 +02001648 ndisc_fill_redirect_addr_option(buff, ha, ops_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
1650 /*
1651 * build redirect option and copy skb over to the new packet.
1652 */
1653
YOSHIFUJI Hideaki / 吉藤英明9c86daf2013-01-21 06:48:09 +00001654 if (rd_len)
YOSHIFUJI Hideaki / 吉藤英明5f5a0112013-01-21 06:48:53 +00001655 ndisc_fill_redirect_hdr_option(buff, skb, rd_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656
Eric Dumazetadf30902009-06-02 05:19:30 +00001657 skb_dst_set(buff, dst);
YOSHIFUJI Hideaki / 吉藤英明f4de84c2013-01-21 06:49:03 +00001658 ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
Ilpo Järvinend73f0802009-02-06 23:47:37 -08001659 return;
1660
1661release:
1662 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663}
1664
1665static void pndisc_redo(struct sk_buff *skb)
1666{
YOSHIFUJI Hideaki140e26fc2005-10-05 12:11:41 -07001667 ndisc_recv_ns(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 kfree_skb(skb);
1669}
1670
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02001671static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
1672{
1673 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1674
1675 if (!idev)
1676 return true;
1677 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
1678 idev->cnf.suppress_frag_ndisc) {
1679 net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
1680 return true;
1681 }
1682 return false;
1683}
1684
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685int ndisc_rcv(struct sk_buff *skb)
1686{
1687 struct nd_msg *msg;
1688
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02001689 if (ndisc_suppress_frag_ndisc(skb))
1690 return 0;
1691
YOSHIFUJI Hideaki / 吉藤英明6bce6b42013-01-21 06:48:03 +00001692 if (skb_linearize(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 return 0;
1694
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -07001695 msg = (struct nd_msg *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -07001697 __skb_push(skb, skb->data - skb_transport_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001699 if (ipv6_hdr(skb)->hop_limit != 255) {
Joe Perches675418d2012-05-16 19:28:38 +00001700 ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
1701 ipv6_hdr(skb)->hop_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 return 0;
1703 }
1704
1705 if (msg->icmph.icmp6_code != 0) {
Joe Perches675418d2012-05-16 19:28:38 +00001706 ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
1707 msg->icmph.icmp6_code);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 return 0;
1709 }
1710
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001711 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1712
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 switch (msg->icmph.icmp6_type) {
1714 case NDISC_NEIGHBOUR_SOLICITATION:
1715 ndisc_recv_ns(skb);
1716 break;
1717
1718 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1719 ndisc_recv_na(skb);
1720 break;
1721
1722 case NDISC_ROUTER_SOLICITATION:
1723 ndisc_recv_rs(skb);
1724 break;
1725
1726 case NDISC_ROUTER_ADVERTISEMENT:
1727 ndisc_router_discovery(skb);
1728 break;
1729
1730 case NDISC_REDIRECT:
1731 ndisc_redirect_rcv(skb);
1732 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001733 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
1735 return 0;
1736}
1737
1738static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1739{
Jiri Pirko351638e2013-05-28 01:30:21 +00001740 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Eric Dumazetc8507fb2015-07-29 12:01:41 +02001741 struct netdev_notifier_change_info *change_info;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001742 struct net *net = dev_net(dev);
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00001743 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
1745 switch (event) {
1746 case NETDEV_CHANGEADDR:
1747 neigh_changeaddr(&nd_tbl, dev);
Michal Kubeček2ac3ac82013-08-01 10:04:14 +02001748 fib6_run_gc(0, net, false);
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00001749 idev = in6_dev_get(dev);
1750 if (!idev)
1751 break;
1752 if (idev->cnf.ndisc_notify)
1753 ndisc_send_unsol_na(dev);
1754 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 break;
Eric Dumazetc8507fb2015-07-29 12:01:41 +02001756 case NETDEV_CHANGE:
1757 change_info = ptr;
1758 if (change_info->flags_changed & IFF_NOARP)
1759 neigh_changeaddr(&nd_tbl, dev);
1760 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 case NETDEV_DOWN:
1762 neigh_ifdown(&nd_tbl, dev);
Michal Kubeček2ac3ac82013-08-01 10:04:14 +02001763 fib6_run_gc(0, net, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 break;
Ben Hutchingsf47b9462011-04-15 13:46:02 +00001765 case NETDEV_NOTIFY_PEERS:
1766 ndisc_send_unsol_na(dev);
1767 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 default:
1769 break;
1770 }
1771
1772 return NOTIFY_DONE;
1773}
1774
1775static struct notifier_block ndisc_netdev_notifier = {
1776 .notifier_call = ndisc_netdev_event,
1777};
1778
1779#ifdef CONFIG_SYSCTL
1780static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1781 const char *func, const char *dev_name)
1782{
1783 static char warncomm[TASK_COMM_LEN];
1784 static int warned;
1785 if (strcmp(warncomm, current->comm) && warned < 5) {
1786 strcpy(warncomm, current->comm);
Joe Perchesf3213832012-05-15 14:11:53 +00001787 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 warncomm, func,
1789 dev_name, ctl->procname,
1790 dev_name, ctl->procname);
1791 warned++;
1792 }
1793}
1794
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07001795int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796{
1797 struct net_device *dev = ctl->extra1;
1798 struct inet6_dev *idev;
1799 int ret;
1800
Eric W. Biedermand12af672007-10-18 03:05:25 -07001801 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1802 (strcmp(ctl->procname, "base_reachable_time") == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1804
Eric W. Biedermand12af672007-10-18 03:05:25 -07001805 if (strcmp(ctl->procname, "retrans_time") == 0)
Jiri Pirkocb5b09c2013-12-07 19:26:54 +01001806 ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);
Eric W. Biedermand12af672007-10-18 03:05:25 -07001807
1808 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
Jiri Pirkocb5b09c2013-12-07 19:26:54 +01001809 ret = neigh_proc_dointvec_jiffies(ctl, write,
1810 buffer, lenp, ppos);
Eric W. Biedermand12af672007-10-18 03:05:25 -07001811
1812 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
YOSHIFUJI Hideakiad02ac12007-10-29 01:32:23 -07001813 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
Jiri Pirkocb5b09c2013-12-07 19:26:54 +01001814 ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
1815 buffer, lenp, ppos);
Eric W. Biedermand12af672007-10-18 03:05:25 -07001816 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 ret = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
1819 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
Jiri Pirko1f9248e2013-12-07 19:26:53 +01001820 if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
1821 idev->nd_parms->reachable_time =
1822 neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 idev->tstamp = jiffies;
1824 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1825 in6_dev_put(idev);
1826 }
1827 return ret;
1828}
1829
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830
1831#endif
1832
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001833static int __net_init ndisc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834{
1835 struct ipv6_pinfo *np;
1836 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001837 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838
Denis V. Lunev1ed85162008-04-03 14:31:03 -07001839 err = inet_ctl_sock_create(&sk, PF_INET6,
1840 SOCK_RAW, IPPROTO_ICMPV6, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 if (err < 0) {
Joe Perches675418d2012-05-16 19:28:38 +00001842 ND_PRINTK(0, err,
1843 "NDISC: Failed to initialize the control socket (err %d)\n",
1844 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 return err;
1846 }
1847
Denis V. Lunev1ed85162008-04-03 14:31:03 -07001848 net->ipv6.ndisc_sk = sk;
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001849
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 np = inet6_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 np->hop_limit = 255;
1852 /* Do not loopback ndisc messages */
1853 np->mc_loop = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001855 return 0;
1856}
1857
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001858static void __net_exit ndisc_net_exit(struct net *net)
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001859{
Denis V. Lunev1ed85162008-04-03 14:31:03 -07001860 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001861}
1862
1863static struct pernet_operations ndisc_net_ops = {
1864 .init = ndisc_net_init,
1865 .exit = ndisc_net_exit,
1866};
1867
1868int __init ndisc_init(void)
1869{
1870 int err;
1871
1872 err = register_pernet_subsys(&ndisc_net_ops);
1873 if (err)
1874 return err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001875 /*
1876 * Initialize the neighbour table
1877 */
WANG Congd7480fd2014-11-10 15:59:36 -08001878 neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
1880#ifdef CONFIG_SYSCTL
Jiri Pirko73af6142013-12-07 19:26:55 +01001881 err = neigh_sysctl_register(NULL, &nd_tbl.parms,
Himangi Saraogi56ec0fb2014-07-25 01:49:37 +05301882 ndisc_ifinfo_sysctl_change);
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001883 if (err)
1884 goto out_unregister_pernet;
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001885out:
Fabio Estevambcd081a2013-11-16 00:52:08 -02001886#endif
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001887 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001889#ifdef CONFIG_SYSCTL
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001890out_unregister_pernet:
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001891 unregister_pernet_subsys(&ndisc_net_ops);
1892 goto out;
Michal Kubeček2c861cc2013-09-09 21:45:04 +02001893#endif
1894}
1895
1896int __init ndisc_late_init(void)
1897{
1898 return register_netdevice_notifier(&ndisc_netdev_notifier);
1899}
1900
1901void ndisc_late_cleanup(void)
1902{
1903 unregister_netdevice_notifier(&ndisc_netdev_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904}
1905
1906void ndisc_cleanup(void)
1907{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908#ifdef CONFIG_SYSCTL
1909 neigh_sysctl_unregister(&nd_tbl.parms);
1910#endif
WANG Congd7480fd2014-11-10 15:59:36 -08001911 neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
Daniel Lezcano1762f7e2008-03-07 11:15:34 -08001912 unregister_pernet_subsys(&ndisc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913}