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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Neighbour Discovery for IPv6 | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 8 | * Mike Shaver <shaver@ingenia.com> |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * Changes: | |
13 | * | |
e35f30c1 | 14 | * Alexey I. Froloff : RFC6106 (DNSSL) support |
31910575 PY |
15 | * Pierre Ynard : export userland ND options |
16 | * through netlink (RDNSS support) | |
1da177e4 LT |
17 | * Lars Fenneberg : fixed MTU setting on receipt |
18 | * of an RA. | |
1da177e4 LT |
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 | ||
675418d5 | 26 | #define pr_fmt(fmt) "ICMPv6: " fmt |
1da177e4 LT |
27 | |
28 | #include <linux/module.h> | |
1da177e4 LT |
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> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #ifdef CONFIG_SYSCTL |
41 | #include <linux/sysctl.h> | |
42 | #endif | |
43 | ||
1823730f | 44 | #include <linux/if_addr.h> |
da13c59b | 45 | #include <linux/if_ether.h> |
1da177e4 LT |
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 | ||
31910575 PY |
61 | #include <net/netlink.h> |
62 | #include <linux/rtnetlink.h> | |
63 | ||
1da177e4 LT |
64 | #include <net/flow.h> |
65 | #include <net/ip6_checksum.h> | |
1ed8516f | 66 | #include <net/inet_common.h> |
1da177e4 LT |
67 | #include <linux/proc_fs.h> |
68 | ||
69 | #include <linux/netfilter.h> | |
70 | #include <linux/netfilter_ipv6.h> | |
71 | ||
d6bf7817 ED |
72 | static u32 ndisc_hash(const void *pkey, |
73 | const struct net_device *dev, | |
2c2aba6c | 74 | __u32 *hash_rnd); |
60395a20 | 75 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
b8fb1ab4 DA |
76 | static bool ndisc_allow_add(const struct net_device *dev, |
77 | struct netlink_ext_ack *extack); | |
1da177e4 LT |
78 | static int ndisc_constructor(struct neighbour *neigh); |
79 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
80 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
81 | static int pndisc_constructor(struct pneigh_entry *n); | |
82 | static void pndisc_destructor(struct pneigh_entry *n); | |
83 | static void pndisc_redo(struct sk_buff *skb); | |
8cf8821e | 84 | static int ndisc_is_multicast(const void *pkey); |
1da177e4 | 85 | |
89d69d2b | 86 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
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, | |
1da177e4 LT |
92 | }; |
93 | ||
89d69d2b | 94 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
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, | |
1da177e4 LT |
100 | }; |
101 | ||
102 | ||
89d69d2b | 103 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 104 | .family = AF_INET6, |
8f40b161 DM |
105 | .output = neigh_direct_output, |
106 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
107 | }; |
108 | ||
109 | struct neigh_table nd_tbl = { | |
110 | .family = AF_INET6, | |
1da177e4 | 111 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 112 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 113 | .hash = ndisc_hash, |
60395a20 | 114 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
115 | .constructor = ndisc_constructor, |
116 | .pconstructor = pndisc_constructor, | |
117 | .pdestructor = pndisc_destructor, | |
118 | .proxy_redo = pndisc_redo, | |
8cf8821e | 119 | .is_multicast = ndisc_is_multicast, |
b8fb1ab4 | 120 | .allow_add = ndisc_allow_add, |
1da177e4 LT |
121 | .id = "ndisc_cache", |
122 | .parms = { | |
b672083e | 123 | .tbl = &nd_tbl, |
b672083e | 124 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
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_GC_STALETIME] = 60 * HZ, | |
eaa72dc4 | 132 | [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, |
1f9248e5 JP |
133 | [NEIGH_VAR_PROXY_QLEN] = 64, |
134 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
135 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
136 | }, | |
1da177e4 LT |
137 | }, |
138 | .gc_interval = 30 * HZ, | |
139 | .gc_thresh1 = 128, | |
140 | .gc_thresh2 = 512, | |
141 | .gc_thresh3 = 1024, | |
142 | }; | |
c4850687 | 143 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 144 | |
cc84b3c6 AA |
145 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, |
146 | int data_len, int pad) | |
1da177e4 | 147 | { |
8ec5da41 | 148 | int space = __ndisc_opt_addr_space(data_len, pad); |
5f5a0115 | 149 | u8 *opt = skb_put(skb, space); |
1da177e4 LT |
150 | |
151 | opt[0] = type; | |
152 | opt[1] = space>>3; | |
153 | ||
154 | memset(opt + 2, 0, pad); | |
155 | opt += pad; | |
156 | space -= pad; | |
157 | ||
158 | memcpy(opt+2, data, data_len); | |
159 | data_len += 2; | |
160 | opt += data_len; | |
e5d08d71 IM |
161 | space -= data_len; |
162 | if (space > 0) | |
1da177e4 | 163 | memset(opt, 0, space); |
1da177e4 | 164 | } |
cc84b3c6 | 165 | EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); |
1da177e4 | 166 | |
8ec5da41 | 167 | static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, |
f997c55c | 168 | void *data, u8 icmp6_type) |
8ec5da41 AA |
169 | { |
170 | __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, | |
171 | ndisc_addr_option_pad(skb->dev->type)); | |
f997c55c AA |
172 | ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); |
173 | } | |
174 | ||
175 | static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, | |
176 | void *ha, | |
177 | const u8 *ops_data) | |
178 | { | |
179 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); | |
180 | ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); | |
8ec5da41 AA |
181 | } |
182 | ||
1da177e4 LT |
183 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
184 | struct nd_opt_hdr *end) | |
185 | { | |
186 | int type; | |
187 | if (!cur || !end || cur >= end) | |
188 | return NULL; | |
189 | type = cur->nd_opt_type; | |
190 | do { | |
191 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 192 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 193 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
194 | } |
195 | ||
f997c55c AA |
196 | static inline int ndisc_is_useropt(const struct net_device *dev, |
197 | struct nd_opt_hdr *opt) | |
31910575 | 198 | { |
e35f30c1 | 199 | return opt->nd_opt_type == ND_OPT_RDNSS || |
f997c55c | 200 | opt->nd_opt_type == ND_OPT_DNSSL || |
66b5f1c4 | 201 | opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL || |
c24a77ed | 202 | opt->nd_opt_type == ND_OPT_PREF64 || |
f997c55c | 203 | ndisc_ops_is_useropt(dev, opt->nd_opt_type); |
31910575 PY |
204 | } |
205 | ||
f997c55c AA |
206 | static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, |
207 | struct nd_opt_hdr *cur, | |
31910575 PY |
208 | struct nd_opt_hdr *end) |
209 | { | |
210 | if (!cur || !end || cur >= end) | |
211 | return NULL; | |
212 | do { | |
213 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
f997c55c AA |
214 | } while (cur < end && !ndisc_is_useropt(dev, cur)); |
215 | return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; | |
31910575 PY |
216 | } |
217 | ||
f997c55c AA |
218 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
219 | u8 *opt, int opt_len, | |
30f2a5f3 | 220 | struct ndisc_options *ndopts) |
1da177e4 LT |
221 | { |
222 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
223 | ||
224 | if (!nd_opt || opt_len < 0 || !ndopts) | |
225 | return NULL; | |
226 | memset(ndopts, 0, sizeof(*ndopts)); | |
227 | while (opt_len) { | |
228 | int l; | |
229 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
230 | return NULL; | |
231 | l = nd_opt->nd_opt_len << 3; | |
232 | if (opt_len < l || l == 0) | |
233 | return NULL; | |
f997c55c AA |
234 | if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) |
235 | goto next_opt; | |
1da177e4 LT |
236 | switch (nd_opt->nd_opt_type) { |
237 | case ND_OPT_SOURCE_LL_ADDR: | |
238 | case ND_OPT_TARGET_LL_ADDR: | |
239 | case ND_OPT_MTU: | |
adc176c5 | 240 | case ND_OPT_NONCE: |
1da177e4 LT |
241 | case ND_OPT_REDIRECT_HDR: |
242 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
243 | ND_PRINTK(2, warn, |
244 | "%s: duplicated ND6 option found: type=%d\n", | |
245 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
246 | } else { |
247 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
248 | } | |
249 | break; | |
250 | case ND_OPT_PREFIX_INFO: | |
251 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 252 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
253 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
254 | break; | |
70ceb4f5 YH |
255 | #ifdef CONFIG_IPV6_ROUTE_INFO |
256 | case ND_OPT_ROUTE_INFO: | |
257 | ndopts->nd_opts_ri_end = nd_opt; | |
258 | if (!ndopts->nd_opts_ri) | |
259 | ndopts->nd_opts_ri = nd_opt; | |
260 | break; | |
261 | #endif | |
1da177e4 | 262 | default: |
f997c55c | 263 | if (ndisc_is_useropt(dev, nd_opt)) { |
31910575 PY |
264 | ndopts->nd_useropts_end = nd_opt; |
265 | if (!ndopts->nd_useropts) | |
266 | ndopts->nd_useropts = nd_opt; | |
267 | } else { | |
268 | /* | |
269 | * Unknown options must be silently ignored, | |
270 | * to accommodate future extension to the | |
271 | * protocol. | |
272 | */ | |
675418d5 JP |
273 | ND_PRINTK(2, notice, |
274 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
275 | __func__, | |
276 | nd_opt->nd_opt_type, | |
277 | nd_opt->nd_opt_len); | |
31910575 | 278 | } |
1da177e4 | 279 | } |
f997c55c | 280 | next_opt: |
1da177e4 LT |
281 | opt_len -= l; |
282 | nd_opt = ((void *)nd_opt) + l; | |
283 | } | |
284 | return ndopts; | |
285 | } | |
286 | ||
b71d1d42 | 287 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
288 | { |
289 | switch (dev->type) { | |
290 | case ARPHRD_ETHER: | |
291 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
292 | case ARPHRD_FDDI: | |
293 | ipv6_eth_mc_map(addr, buf); | |
294 | return 0; | |
1da177e4 LT |
295 | case ARPHRD_ARCNET: |
296 | ipv6_arcnet_mc_map(addr, buf); | |
297 | return 0; | |
298 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 299 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 300 | return 0; |
93ca3bb5 TT |
301 | case ARPHRD_IPGRE: |
302 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
303 | default: |
304 | if (dir) { | |
305 | memcpy(buf, dev->broadcast, dev->addr_len); | |
306 | return 0; | |
307 | } | |
308 | } | |
309 | return -EINVAL; | |
310 | } | |
7159039a YH |
311 | EXPORT_SYMBOL(ndisc_mc_map); |
312 | ||
d6bf7817 ED |
313 | static u32 ndisc_hash(const void *pkey, |
314 | const struct net_device *dev, | |
2c2aba6c | 315 | __u32 *hash_rnd) |
1da177e4 | 316 | { |
2c2aba6c | 317 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
318 | } |
319 | ||
60395a20 EB |
320 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
321 | { | |
322 | return neigh_key_eq128(n, pkey); | |
323 | } | |
324 | ||
1da177e4 LT |
325 | static int ndisc_constructor(struct neighbour *neigh) |
326 | { | |
67ba4152 | 327 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
328 | struct net_device *dev = neigh->dev; |
329 | struct inet6_dev *in6_dev; | |
330 | struct neigh_parms *parms; | |
a50feda5 | 331 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 332 | |
1da177e4 | 333 | in6_dev = in6_dev_get(dev); |
63159f29 | 334 | if (!in6_dev) { |
1da177e4 LT |
335 | return -EINVAL; |
336 | } | |
337 | ||
338 | parms = in6_dev->nd_parms; | |
339 | __neigh_parms_put(neigh->parms); | |
340 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
341 | |
342 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 343 | if (!dev->header_ops) { |
1da177e4 LT |
344 | neigh->nud_state = NUD_NOARP; |
345 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 346 | neigh->output = neigh_direct_output; |
1da177e4 LT |
347 | } else { |
348 | if (is_multicast) { | |
349 | neigh->nud_state = NUD_NOARP; | |
350 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
351 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
352 | neigh->nud_state = NUD_NOARP; | |
353 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
354 | if (dev->flags&IFF_LOOPBACK) | |
355 | neigh->type = RTN_LOCAL; | |
356 | } else if (dev->flags&IFF_POINTOPOINT) { | |
357 | neigh->nud_state = NUD_NOARP; | |
358 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
359 | } | |
3b04ddde | 360 | if (dev->header_ops->cache) |
1da177e4 LT |
361 | neigh->ops = &ndisc_hh_ops; |
362 | else | |
363 | neigh->ops = &ndisc_generic_ops; | |
364 | if (neigh->nud_state&NUD_VALID) | |
365 | neigh->output = neigh->ops->connected_output; | |
366 | else | |
367 | neigh->output = neigh->ops->output; | |
368 | } | |
369 | in6_dev_put(in6_dev); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static int pndisc_constructor(struct pneigh_entry *n) | |
374 | { | |
67ba4152 | 375 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
376 | struct in6_addr maddr; |
377 | struct net_device *dev = n->dev; | |
378 | ||
63159f29 | 379 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
380 | return -EINVAL; |
381 | addrconf_addr_solict_mult(addr, &maddr); | |
382 | ipv6_dev_mc_inc(dev, &maddr); | |
383 | return 0; | |
384 | } | |
385 | ||
386 | static void pndisc_destructor(struct pneigh_entry *n) | |
387 | { | |
67ba4152 | 388 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
389 | struct in6_addr maddr; |
390 | struct net_device *dev = n->dev; | |
391 | ||
63159f29 | 392 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
393 | return; |
394 | addrconf_addr_solict_mult(addr, &maddr); | |
395 | ipv6_dev_mc_dec(dev, &maddr); | |
396 | } | |
397 | ||
b8fb1ab4 DA |
398 | /* called with rtnl held */ |
399 | static bool ndisc_allow_add(const struct net_device *dev, | |
400 | struct netlink_ext_ack *extack) | |
401 | { | |
402 | struct inet6_dev *idev = __in6_dev_get(dev); | |
403 | ||
404 | if (!idev || idev->cnf.disable_ipv6) { | |
405 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device"); | |
406 | return false; | |
407 | } | |
408 | ||
409 | return true; | |
410 | } | |
411 | ||
de09334b YH |
412 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
413 | int len) | |
414 | { | |
415 | int hlen = LL_RESERVED_SPACE(dev); | |
416 | int tlen = dev->needed_tailroom; | |
417 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
418 | struct sk_buff *skb; | |
de09334b | 419 | |
25a6e6b8 | 420 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 421 | if (!skb) { |
25a6e6b8 TG |
422 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
423 | __func__); | |
de09334b YH |
424 | return NULL; |
425 | } | |
426 | ||
f382d03a YH |
427 | skb->protocol = htons(ETH_P_IPV6); |
428 | skb->dev = dev; | |
429 | ||
527a150f | 430 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 431 | skb_reset_transport_header(skb); |
de09334b | 432 | |
25a6e6b8 TG |
433 | /* Manually assign socket ownership as we avoid calling |
434 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
435 | */ | |
436 | skb_set_owner_w(skb, sk); | |
437 | ||
de09334b YH |
438 | return skb; |
439 | } | |
440 | ||
f382d03a | 441 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
442 | const struct in6_addr *saddr, |
443 | const struct in6_addr *daddr, | |
c8d6c380 | 444 | int hop_limit, int len) |
2576f17d YH |
445 | { |
446 | struct ipv6hdr *hdr; | |
2210d6b2 MŻ |
447 | struct inet6_dev *idev; |
448 | unsigned tclass; | |
449 | ||
450 | rcu_read_lock(); | |
451 | idev = __in6_dev_get(skb->dev); | |
452 | tclass = idev ? idev->cnf.ndisc_tclass : 0; | |
453 | rcu_read_unlock(); | |
2576f17d | 454 | |
527a150f | 455 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 456 | skb_reset_network_header(skb); |
2576f17d YH |
457 | hdr = ipv6_hdr(skb); |
458 | ||
2210d6b2 | 459 | ip6_flow_hdr(hdr, tclass, 0); |
2576f17d YH |
460 | |
461 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
462 | hdr->nexthdr = IPPROTO_ICMPV6; |
463 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
464 | |
465 | hdr->saddr = *saddr; | |
466 | hdr->daddr = *daddr; | |
467 | } | |
468 | ||
af9a9976 | 469 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 470 | const struct in6_addr *daddr, |
aa4bdd4b | 471 | const struct in6_addr *saddr) |
305d552a | 472 | { |
f4de84c6 | 473 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 474 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 475 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
476 | struct inet6_dev *idev; |
477 | int err; | |
aa4bdd4b | 478 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
479 | u8 type; |
480 | ||
481 | type = icmp6h->icmp6_type; | |
482 | ||
f4de84c6 | 483 | if (!dst) { |
f4de84c6 | 484 | struct flowi6 fl6; |
e0d56fdd | 485 | int oif = skb->dev->ifindex; |
305d552a | 486 | |
ca254490 | 487 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
f4de84c6 YH |
488 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
489 | if (IS_ERR(dst)) { | |
490 | kfree_skb(skb); | |
491 | return; | |
492 | } | |
493 | ||
494 | skb_dst_set(skb, dst); | |
495 | } | |
e1ec7842 | 496 | |
7b3d9b06 YH |
497 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
498 | IPPROTO_ICMPV6, | |
499 | csum_partial(icmp6h, | |
500 | skb->len, 0)); | |
501 | ||
502 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
503 | ||
cfdf7647 ED |
504 | rcu_read_lock(); |
505 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 506 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 507 | |
29a26a56 EB |
508 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
509 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 510 | dst_output); |
1da177e4 | 511 | if (!err) { |
5c5d244b | 512 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 513 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
514 | } |
515 | ||
cfdf7647 | 516 | rcu_read_unlock(); |
1ab1457c | 517 | } |
1da177e4 | 518 | |
38cf595b | 519 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
520 | const struct in6_addr *solicited_addr, |
521 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 522 | { |
b44b5f4a | 523 | struct sk_buff *skb; |
e1ec7842 YH |
524 | struct in6_addr tmpaddr; |
525 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 526 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
527 | struct nd_msg *msg; |
528 | int optlen = 0; | |
e1ec7842 YH |
529 | |
530 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 531 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
532 | if (ifp) { |
533 | src_addr = solicited_addr; | |
534 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 535 | override = false; |
9f888160 | 536 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
537 | in6_ifa_put(ifp); |
538 | } else { | |
191cd582 | 539 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 540 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 541 | &tmpaddr)) |
e1ec7842 YH |
542 | return; |
543 | src_addr = &tmpaddr; | |
544 | } | |
545 | ||
1cb3fe51 | 546 | if (!dev->addr_len) |
9a21ac94 | 547 | inc_opt = false; |
1cb3fe51 | 548 | if (inc_opt) |
f997c55c AA |
549 | optlen += ndisc_opt_addr_space(dev, |
550 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
e1ec7842 | 551 | |
1cb3fe51 | 552 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
553 | if (!skb) |
554 | return; | |
555 | ||
4df864c1 | 556 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
557 | *msg = (struct nd_msg) { |
558 | .icmph = { | |
559 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
560 | .icmp6_router = router, | |
561 | .icmp6_solicited = solicited, | |
562 | .icmp6_override = override, | |
563 | }, | |
564 | .target = *solicited_addr, | |
565 | }; | |
566 | ||
567 | if (inc_opt) | |
568 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
f997c55c AA |
569 | dev->dev_addr, |
570 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
1cb3fe51 | 571 | |
b44b5f4a | 572 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
573 | } |
574 | ||
f47b9464 BH |
575 | static void ndisc_send_unsol_na(struct net_device *dev) |
576 | { | |
577 | struct inet6_dev *idev; | |
578 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
579 | |
580 | idev = in6_dev_get(dev); | |
581 | if (!idev) | |
582 | return; | |
583 | ||
584 | read_lock_bh(&idev->lock); | |
585 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
c76fe2d9 DA |
586 | /* skip tentative addresses until dad completes */ |
587 | if (ifa->flags & IFA_F_TENTATIVE && | |
588 | !(ifa->flags & IFA_F_OPTIMISTIC)) | |
589 | continue; | |
590 | ||
38cf595b | 591 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
592 | /*router=*/ !!idev->cnf.forwarding, |
593 | /*solicited=*/ false, /*override=*/ true, | |
594 | /*inc_opt=*/ true); | |
595 | } | |
596 | read_unlock_bh(&idev->lock); | |
597 | ||
598 | in6_dev_put(idev); | |
599 | } | |
600 | ||
38cf595b | 601 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
adc176c5 EN |
602 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
603 | u64 nonce) | |
1da177e4 | 604 | { |
b44b5f4a | 605 | struct sk_buff *skb; |
1da177e4 | 606 | struct in6_addr addr_buf; |
1cb3fe51 YH |
607 | int inc_opt = dev->addr_len; |
608 | int optlen = 0; | |
609 | struct nd_msg *msg; | |
1da177e4 | 610 | |
63159f29 | 611 | if (!saddr) { |
95c385b4 NH |
612 | if (ipv6_get_lladdr(dev, &addr_buf, |
613 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
614 | return; |
615 | saddr = &addr_buf; | |
616 | } | |
617 | ||
1cb3fe51 | 618 | if (ipv6_addr_any(saddr)) |
f2f79cca | 619 | inc_opt = false; |
1cb3fe51 | 620 | if (inc_opt) |
f997c55c AA |
621 | optlen += ndisc_opt_addr_space(dev, |
622 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
623 | if (nonce != 0) |
624 | optlen += 8; | |
1cb3fe51 YH |
625 | |
626 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
627 | if (!skb) |
628 | return; | |
629 | ||
4df864c1 | 630 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
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, | |
f997c55c AA |
640 | dev->dev_addr, |
641 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
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 | } | |
1cb3fe51 | 649 | |
b44b5f4a | 650 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
651 | } |
652 | ||
9acd9f3a YH |
653 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
654 | const struct in6_addr *daddr) | |
1da177e4 | 655 | { |
b44b5f4a | 656 | struct sk_buff *skb; |
1cb3fe51 | 657 | struct rs_msg *msg; |
95c385b4 | 658 | int send_sllao = dev->addr_len; |
1cb3fe51 | 659 | int optlen = 0; |
95c385b4 NH |
660 | |
661 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
662 | /* | |
663 | * According to section 2.2 of RFC 4429, we must not | |
664 | * send router solicitations with a sllao from | |
665 | * optimistic addresses, but we may send the solicitation | |
666 | * if we don't include the sllao. So here we check | |
667 | * if our address is optimistic, and if so, we | |
bea85195 | 668 | * suppress the inclusion of the sllao. |
95c385b4 NH |
669 | */ |
670 | if (send_sllao) { | |
c346dca1 | 671 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 672 | dev, 1); |
95c385b4 NH |
673 | if (ifp) { |
674 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 675 | send_sllao = 0; |
95c385b4 | 676 | } |
ca043569 | 677 | in6_ifa_put(ifp); |
95c385b4 NH |
678 | } else { |
679 | send_sllao = 0; | |
680 | } | |
681 | } | |
682 | #endif | |
1cb3fe51 | 683 | if (send_sllao) |
f997c55c | 684 | optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); |
1cb3fe51 YH |
685 | |
686 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
687 | if (!skb) |
688 | return; | |
689 | ||
4df864c1 | 690 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
691 | *msg = (struct rs_msg) { |
692 | .icmph = { | |
693 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
694 | }, | |
695 | }; | |
696 | ||
697 | if (send_sllao) | |
698 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
699 | dev->dev_addr, |
700 | NDISC_ROUTER_SOLICITATION); | |
1cb3fe51 | 701 | |
b44b5f4a | 702 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 703 | } |
1ab1457c | 704 | |
1da177e4 LT |
705 | |
706 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
707 | { | |
708 | /* | |
709 | * "The sender MUST return an ICMP | |
710 | * destination unreachable" | |
711 | */ | |
712 | dst_link_failure(skb); | |
713 | kfree_skb(skb); | |
714 | } | |
715 | ||
716 | /* Called with locked neigh: either read or both */ | |
717 | ||
718 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
719 | { | |
720 | struct in6_addr *saddr = NULL; | |
721 | struct in6_addr mcaddr; | |
722 | struct net_device *dev = neigh->dev; | |
723 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
724 | int probes = atomic_read(&neigh->probes); | |
725 | ||
c58da4c6 | 726 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
232378e8 | 727 | dev, false, 1, |
c58da4c6 | 728 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) |
0660e03f | 729 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
730 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
731 | if (probes < 0) { | |
1da177e4 | 732 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
733 | ND_PRINTK(1, dbg, |
734 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
735 | __func__, target); | |
1da177e4 | 736 | } |
adc176c5 | 737 | ndisc_send_ns(dev, target, target, saddr, 0); |
1f9248e5 | 738 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 739 | neigh_app_ns(neigh); |
1da177e4 LT |
740 | } else { |
741 | addrconf_addr_solict_mult(target, &mcaddr); | |
adc176c5 | 742 | ndisc_send_ns(dev, target, &mcaddr, saddr, 0); |
1da177e4 LT |
743 | } |
744 | } | |
745 | ||
0736ffc0 YH |
746 | static int pndisc_is_router(const void *pkey, |
747 | struct net_device *dev) | |
fa86d322 PE |
748 | { |
749 | struct pneigh_entry *n; | |
0736ffc0 | 750 | int ret = -1; |
fa86d322 PE |
751 | |
752 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
753 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
754 | if (n) | |
755 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
756 | read_unlock_bh(&nd_tbl.lock); |
757 | ||
0736ffc0 | 758 | return ret; |
fa86d322 PE |
759 | } |
760 | ||
f997c55c AA |
761 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
762 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
763 | struct ndisc_options *ndopts) | |
764 | { | |
7b8f7a40 | 765 | neigh_update(neigh, lladdr, new, flags, 0); |
f997c55c AA |
766 | /* report ndisc ops about neighbour update */ |
767 | ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); | |
768 | } | |
769 | ||
1da177e4 LT |
770 | static void ndisc_recv_ns(struct sk_buff *skb) |
771 | { | |
9c70220b | 772 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
773 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
774 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 775 | u8 *lladdr = NULL; |
29a3cad5 | 776 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 777 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
778 | struct ndisc_options ndopts; |
779 | struct net_device *dev = skb->dev; | |
780 | struct inet6_ifaddr *ifp; | |
781 | struct inet6_dev *idev = NULL; | |
782 | struct neighbour *neigh; | |
783 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 784 | bool inc; |
0736ffc0 | 785 | int is_router = -1; |
adc176c5 | 786 | u64 nonce = 0; |
1da177e4 | 787 | |
115b0aa6 YH |
788 | if (skb->len < sizeof(struct nd_msg)) { |
789 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
790 | return; | |
791 | } | |
792 | ||
1da177e4 | 793 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 794 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
795 | return; |
796 | } | |
797 | ||
798 | /* | |
799 | * RFC2461 7.1.1: | |
800 | * DAD has to be destined for solicited node multicast address. | |
801 | */ | |
ca97a644 | 802 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 803 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
804 | return; |
805 | } | |
806 | ||
f997c55c | 807 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 808 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
809 | return; |
810 | } | |
811 | ||
812 | if (ndopts.nd_opts_src_lladdr) { | |
813 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
814 | if (!lladdr) { | |
675418d5 JP |
815 | ND_PRINTK(2, warn, |
816 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
817 | return; |
818 | } | |
819 | ||
820 | /* RFC2461 7.1.1: | |
1ab1457c YH |
821 | * If the IP source address is the unspecified address, |
822 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
823 | * in the message. |
824 | */ | |
825 | if (dad) { | |
675418d5 JP |
826 | ND_PRINTK(2, warn, |
827 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
828 | return; |
829 | } | |
830 | } | |
e6651599 | 831 | if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1) |
adc176c5 | 832 | memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6); |
1da177e4 LT |
833 | |
834 | inc = ipv6_addr_is_multicast(daddr); | |
835 | ||
c346dca1 | 836 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 837 | if (ifp) { |
ca254490 | 838 | have_ifp: |
95c385b4 NH |
839 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
840 | if (dad) { | |
adc176c5 EN |
841 | if (nonce != 0 && ifp->dad_nonce == nonce) { |
842 | u8 *np = (u8 *)&nonce; | |
843 | /* Matching nonce if looped back */ | |
844 | ND_PRINTK(2, notice, | |
845 | "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n", | |
846 | ifp->idev->dev->name, | |
847 | &ifp->addr, np); | |
848 | goto out; | |
849 | } | |
95c385b4 NH |
850 | /* |
851 | * We are colliding with another node | |
852 | * who is doing DAD | |
853 | * so fail our DAD process | |
854 | */ | |
da13c59b | 855 | addrconf_dad_failure(skb, ifp); |
9e3be4b3 | 856 | return; |
95c385b4 NH |
857 | } else { |
858 | /* | |
859 | * This is not a dad solicitation. | |
860 | * If we are an optimistic node, | |
861 | * we should respond. | |
862 | * Otherwise, we should ignore it. | |
863 | */ | |
864 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 865 | goto out; |
1da177e4 | 866 | } |
1da177e4 LT |
867 | } |
868 | ||
869 | idev = ifp->idev; | |
870 | } else { | |
53b7997f YH |
871 | struct net *net = dev_net(dev); |
872 | ||
ca254490 DA |
873 | /* perhaps an address on the master device */ |
874 | if (netif_is_l3_slave(dev)) { | |
875 | struct net_device *mdev; | |
876 | ||
877 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
878 | if (mdev) { | |
879 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
880 | if (ifp) | |
881 | goto have_ifp; | |
882 | } | |
883 | } | |
884 | ||
1da177e4 LT |
885 | idev = in6_dev_get(dev); |
886 | if (!idev) { | |
887 | /* XXX: count this drop? */ | |
888 | return; | |
889 | } | |
890 | ||
53b7997f | 891 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 892 | (idev->cnf.forwarding && |
53b7997f | 893 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 894 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 895 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 896 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 897 | inc && |
1f9248e5 | 898 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
899 | /* |
900 | * for anycast or proxy, | |
1ab1457c YH |
901 | * sender should delay its response |
902 | * by a random time between 0 and | |
1da177e4 LT |
903 | * MAX_ANYCAST_DELAY_TIME seconds. |
904 | * (RFC2461) -- yoshfuji | |
905 | */ | |
906 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
907 | if (n) | |
908 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
909 | goto out; | |
910 | } | |
911 | } else | |
912 | goto out; | |
913 | } | |
914 | ||
0736ffc0 | 915 | if (is_router < 0) |
fb568637 | 916 | is_router = idev->cnf.forwarding; |
62dd9318 | 917 | |
1da177e4 | 918 | if (dad) { |
38cf595b | 919 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 920 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
921 | goto out; |
922 | } | |
923 | ||
924 | if (inc) | |
925 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
926 | else | |
927 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
928 | ||
1ab1457c | 929 | /* |
1da177e4 LT |
930 | * update / create cache entry |
931 | * for the source address | |
932 | */ | |
933 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
934 | !inc || lladdr || !dev->addr_len); | |
935 | if (neigh) | |
f997c55c | 936 | ndisc_update(dev, neigh, lladdr, NUD_STALE, |
1da177e4 | 937 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
f997c55c AA |
938 | NEIGH_UPDATE_F_OVERRIDE, |
939 | NDISC_NEIGHBOUR_SOLICITATION, &ndopts); | |
3b04ddde | 940 | if (neigh || !dev->header_ops) { |
38cf595b | 941 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 942 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
943 | if (neigh) |
944 | neigh_release(neigh); | |
945 | } | |
946 | ||
947 | out: | |
948 | if (ifp) | |
949 | in6_ifa_put(ifp); | |
950 | else | |
951 | in6_dev_put(idev); | |
1da177e4 LT |
952 | } |
953 | ||
954 | static void ndisc_recv_na(struct sk_buff *skb) | |
955 | { | |
9c70220b | 956 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 957 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 958 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 959 | u8 *lladdr = NULL; |
29a3cad5 | 960 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 961 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
962 | struct ndisc_options ndopts; |
963 | struct net_device *dev = skb->dev; | |
7a02bf89 | 964 | struct inet6_dev *idev = __in6_dev_get(dev); |
1da177e4 LT |
965 | struct inet6_ifaddr *ifp; |
966 | struct neighbour *neigh; | |
967 | ||
968 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 969 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
970 | return; |
971 | } | |
972 | ||
973 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 974 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
975 | return; |
976 | } | |
977 | ||
978 | if (ipv6_addr_is_multicast(daddr) && | |
979 | msg->icmph.icmp6_solicited) { | |
675418d5 | 980 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
981 | return; |
982 | } | |
1ab1457c | 983 | |
7a02bf89 JB |
984 | /* For some 802.11 wireless deployments (and possibly other networks), |
985 | * there will be a NA proxy and unsolicitd packets are attacks | |
986 | * and thus should not be accepted. | |
987 | */ | |
988 | if (!msg->icmph.icmp6_solicited && idev && | |
989 | idev->cnf.drop_unsolicited_na) | |
990 | return; | |
991 | ||
f997c55c | 992 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 993 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
994 | return; |
995 | } | |
996 | if (ndopts.nd_opts_tgt_lladdr) { | |
997 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
998 | if (!lladdr) { | |
675418d5 JP |
999 | ND_PRINTK(2, warn, |
1000 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
1001 | return; |
1002 | } | |
1003 | } | |
c346dca1 | 1004 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 1005 | if (ifp) { |
bd015928 DW |
1006 | if (skb->pkt_type != PACKET_LOOPBACK |
1007 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
da13c59b | 1008 | addrconf_dad_failure(skb, ifp); |
bd015928 | 1009 | return; |
1da177e4 LT |
1010 | } |
1011 | /* What should we make now? The advertisement | |
1012 | is invalid, but ndisc specs say nothing | |
1013 | about it. It could be misconfiguration, or | |
1014 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
1015 | |
1016 | We should not print the error if NA has been | |
1017 | received from loopback - it is just our own | |
1018 | unsolicited advertisement. | |
1da177e4 | 1019 | */ |
24fc7b86 | 1020 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 | 1021 | ND_PRINTK(1, warn, |
da13c59b VP |
1022 | "NA: %pM advertised our address %pI6c on %s!\n", |
1023 | eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
1024 | in6_ifa_put(ifp); |
1025 | return; | |
1026 | } | |
1027 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
1028 | ||
1029 | if (neigh) { | |
1030 | u8 old_flags = neigh->flags; | |
53b7997f | 1031 | struct net *net = dev_net(dev); |
1da177e4 LT |
1032 | |
1033 | if (neigh->nud_state & NUD_FAILED) | |
1034 | goto out; | |
1035 | ||
5f3e6e9e VN |
1036 | /* |
1037 | * Don't update the neighbor cache entry on a proxy NA from | |
1038 | * ourselves because either the proxied node is off link or it | |
1039 | * has already sent a NA to us. | |
1040 | */ | |
1041 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
1042 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
1043 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 1044 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 1045 | goto out; |
fbea49e1 | 1046 | } |
5f3e6e9e | 1047 | |
f997c55c | 1048 | ndisc_update(dev, neigh, lladdr, |
1da177e4 LT |
1049 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
1050 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1051 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1052 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1053 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), |
1054 | NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1055 | |
1056 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1057 | /* | |
1058 | * Change: router to host | |
1059 | */ | |
be7a010d | 1060 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | out: | |
1064 | neigh_release(neigh); | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1069 | { | |
9c70220b | 1070 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1071 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1072 | struct neighbour *neigh; | |
1073 | struct inet6_dev *idev; | |
b71d1d42 | 1074 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1075 | struct ndisc_options ndopts; |
1076 | u8 *lladdr = NULL; | |
1077 | ||
1078 | if (skb->len < sizeof(*rs_msg)) | |
1079 | return; | |
1080 | ||
cfdf7647 | 1081 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 1082 | if (!idev) { |
675418d5 | 1083 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
1084 | return; |
1085 | } | |
1086 | ||
1087 | /* Don't accept RS if we're not in router mode */ | |
1088 | if (!idev->cnf.forwarding) | |
1089 | goto out; | |
1090 | ||
1091 | /* | |
1092 | * Don't update NCE if src = ::; | |
1093 | * this implies that the source node has no ip address assigned yet. | |
1094 | */ | |
1095 | if (ipv6_addr_any(saddr)) | |
1096 | goto out; | |
1097 | ||
1098 | /* Parse ND options */ | |
f997c55c | 1099 | if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 1100 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1101 | goto out; |
1102 | } | |
1103 | ||
1104 | if (ndopts.nd_opts_src_lladdr) { | |
1105 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1106 | skb->dev); | |
1107 | if (!lladdr) | |
1108 | goto out; | |
1109 | } | |
1110 | ||
1111 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1112 | if (neigh) { | |
f997c55c | 1113 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1114 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1115 | NEIGH_UPDATE_F_OVERRIDE| | |
f997c55c AA |
1116 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER, |
1117 | NDISC_ROUTER_SOLICITATION, &ndopts); | |
1da177e4 LT |
1118 | neigh_release(neigh); |
1119 | } | |
1120 | out: | |
cfdf7647 | 1121 | return; |
1da177e4 LT |
1122 | } |
1123 | ||
31910575 PY |
1124 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1125 | { | |
1126 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1127 | struct sk_buff *skb; | |
1128 | struct nlmsghdr *nlh; | |
1129 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1130 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1131 | int err; |
1132 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1133 | + (opt->nd_opt_len << 3)); | |
1134 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1135 | ||
1136 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1137 | if (!skb) { |
31910575 PY |
1138 | err = -ENOBUFS; |
1139 | goto errout; | |
1140 | } | |
1141 | ||
1142 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1143 | if (!nlh) { |
31910575 PY |
1144 | goto nla_put_failure; |
1145 | } | |
1146 | ||
1147 | ndmsg = nlmsg_data(nlh); | |
1148 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1149 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1150 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1151 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1152 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1153 | ||
1154 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1155 | ||
930345ea | 1156 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1157 | goto nla_put_failure; |
31910575 PY |
1158 | nlmsg_end(skb, nlh); |
1159 | ||
1ce85fe4 | 1160 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1161 | return; |
1162 | ||
1163 | nla_put_failure: | |
1164 | nlmsg_free(skb); | |
1165 | err = -EMSGSIZE; | |
1166 | errout: | |
a18bc695 | 1167 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1168 | } |
1169 | ||
1da177e4 LT |
1170 | static void ndisc_router_discovery(struct sk_buff *skb) |
1171 | { | |
9c70220b | 1172 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1173 | struct neighbour *neigh = NULL; |
1174 | struct inet6_dev *in6_dev; | |
8d1c802b | 1175 | struct fib6_info *rt = NULL; |
6b2e04bc | 1176 | u32 defrtr_usr_metric; |
afb1d4b5 | 1177 | struct net *net; |
1da177e4 LT |
1178 | int lifetime; |
1179 | struct ndisc_options ndopts; | |
1180 | int optlen; | |
ebacaaa0 | 1181 | unsigned int pref = 0; |
a394eef5 | 1182 | __u32 old_if_flags; |
2053aeb6 | 1183 | bool send_ifinfo_notify = false; |
1da177e4 | 1184 | |
67ba4152 | 1185 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1186 | |
29a3cad5 SH |
1187 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1188 | sizeof(struct ra_msg); | |
1da177e4 | 1189 | |
f2a762d8 BG |
1190 | ND_PRINTK(2, info, |
1191 | "RA: %s, dev: %s\n", | |
1192 | __func__, skb->dev->name); | |
0660e03f | 1193 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1194 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1195 | return; |
1196 | } | |
1197 | if (optlen < 0) { | |
675418d5 | 1198 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1199 | return; |
1200 | } | |
1201 | ||
de357cc0 | 1202 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1203 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1204 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1205 | return; |
1206 | } | |
de357cc0 | 1207 | #endif |
fadf6bf0 | 1208 | |
1da177e4 LT |
1209 | /* |
1210 | * set the RA_RECV flag in the interface | |
1211 | */ | |
1212 | ||
cfdf7647 | 1213 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1214 | if (!in6_dev) { |
675418d5 JP |
1215 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1216 | skb->dev->name); | |
1da177e4 LT |
1217 | return; |
1218 | } | |
1da177e4 | 1219 | |
f997c55c | 1220 | if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) { |
675418d5 | 1221 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1222 | return; |
1223 | } | |
1224 | ||
f2a762d8 BG |
1225 | if (!ipv6_accept_ra(in6_dev)) { |
1226 | ND_PRINTK(2, info, | |
1227 | "RA: %s, did not accept ra for dev: %s\n", | |
1228 | __func__, skb->dev->name); | |
31ce8c71 | 1229 | goto skip_linkparms; |
f2a762d8 | 1230 | } |
31ce8c71 | 1231 | |
de357cc0 | 1232 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1233 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1234 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1235 | ND_PRINTK(2, info, | |
1236 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1237 | __func__, skb->dev->name); | |
fadf6bf0 | 1238 | goto skip_linkparms; |
f2a762d8 | 1239 | } |
de357cc0 | 1240 | #endif |
fadf6bf0 | 1241 | |
1da177e4 LT |
1242 | if (in6_dev->if_flags & IF_RS_SENT) { |
1243 | /* | |
1244 | * flag that an RA was received after an RS was sent | |
1245 | * out on this interface. | |
1246 | */ | |
1247 | in6_dev->if_flags |= IF_RA_RCVD; | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Remember the managed/otherconf flags from most recently | |
1252 | * received RA message (RFC 2462) -- yoshfuji | |
1253 | */ | |
a394eef5 | 1254 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1255 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1256 | IF_RA_OTHERCONF)) | | |
1257 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1258 | IF_RA_MANAGED : 0) | | |
1259 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1260 | IF_RA_OTHERCONF : 0); | |
1261 | ||
a394eef5 | 1262 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1263 | send_ifinfo_notify = true; |
a394eef5 | 1264 | |
f2a762d8 BG |
1265 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1266 | ND_PRINTK(2, info, | |
1267 | "RA: %s, defrtr is false for dev: %s\n", | |
1268 | __func__, skb->dev->name); | |
65f5c7c1 | 1269 | goto skip_defrtr; |
f2a762d8 | 1270 | } |
65f5c7c1 | 1271 | |
d9333196 BG |
1272 | /* Do not accept RA with source-addr found on local machine unless |
1273 | * accept_ra_from_local is set to true. | |
1274 | */ | |
afb1d4b5 | 1275 | net = dev_net(in6_dev->dev); |
b6428817 | 1276 | if (!in6_dev->cnf.accept_ra_from_local && |
afb1d4b5 | 1277 | ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) { |
f2a762d8 | 1278 | ND_PRINTK(2, info, |
d9333196 BG |
1279 | "RA from local address detected on dev: %s: default router ignored\n", |
1280 | skb->dev->name); | |
9f56220f | 1281 | goto skip_defrtr; |
f2a762d8 | 1282 | } |
9f56220f | 1283 | |
1da177e4 LT |
1284 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1285 | ||
ebacaaa0 YH |
1286 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1287 | pref = ra_msg->icmph.icmp6_router_pref; | |
1288 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1289 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1290 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1291 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1292 | #endif | |
f88d8ea6 | 1293 | /* routes added from RAs do not use nexthop objects */ |
afb1d4b5 | 1294 | rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev); |
eb857186 | 1295 | if (rt) { |
1cf844c7 DA |
1296 | neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, |
1297 | rt->fib6_nh->fib_nh_dev, NULL, | |
f8a1b43b | 1298 | &ipv6_hdr(skb)->saddr); |
eb857186 | 1299 | if (!neigh) { |
675418d5 JP |
1300 | ND_PRINTK(0, err, |
1301 | "RA: %s got default router without neighbour\n", | |
1302 | __func__); | |
93531c67 | 1303 | fib6_info_release(rt); |
eb857186 DM |
1304 | return; |
1305 | } | |
1306 | } | |
6b2e04bc PC |
1307 | /* Set default route metric as specified by user */ |
1308 | defrtr_usr_metric = in6_dev->cnf.ra_defrtr_metric; | |
1309 | /* delete the route if lifetime is 0 or if metric needs change */ | |
1310 | if (rt && (lifetime == 0 || rt->fib6_metric != defrtr_usr_metric)) { | |
11dd74b3 | 1311 | ip6_del_rt(net, rt, false); |
1da177e4 LT |
1312 | rt = NULL; |
1313 | } | |
1314 | ||
6b2e04bc PC |
1315 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, metric: %d, for dev: %s\n", |
1316 | rt, lifetime, defrtr_usr_metric, skb->dev->name); | |
63159f29 | 1317 | if (!rt && lifetime) { |
f2a762d8 | 1318 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1319 | |
afb1d4b5 | 1320 | rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr, |
6b2e04bc | 1321 | skb->dev, pref, defrtr_usr_metric); |
63159f29 | 1322 | if (!rt) { |
675418d5 JP |
1323 | ND_PRINTK(0, err, |
1324 | "RA: %s failed to add default route\n", | |
1325 | __func__); | |
1da177e4 LT |
1326 | return; |
1327 | } | |
1328 | ||
1cf844c7 DA |
1329 | neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, |
1330 | rt->fib6_nh->fib_nh_dev, NULL, | |
f8a1b43b | 1331 | &ipv6_hdr(skb)->saddr); |
63159f29 | 1332 | if (!neigh) { |
675418d5 JP |
1333 | ND_PRINTK(0, err, |
1334 | "RA: %s got default router without neighbour\n", | |
1335 | __func__); | |
93531c67 | 1336 | fib6_info_release(rt); |
1da177e4 LT |
1337 | return; |
1338 | } | |
1339 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1340 | } else if (rt) { |
93c2fb25 | 1341 | rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1342 | } |
1343 | ||
1344 | if (rt) | |
14895687 | 1345 | fib6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1346 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1347 | ra_msg->icmph.icmp6_hop_limit) { | |
1348 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1349 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
d4ead6b3 DA |
1350 | fib6_metric_set(rt, RTAX_HOPLIMIT, |
1351 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1352 | } else { |
8013d1d7 | 1353 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1354 | } |
1da177e4 LT |
1355 | } |
1356 | ||
65f5c7c1 YH |
1357 | skip_defrtr: |
1358 | ||
1da177e4 LT |
1359 | /* |
1360 | * Update Reachable Time and Retrans Timer | |
1361 | */ | |
1362 | ||
1363 | if (in6_dev->nd_parms) { | |
1364 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1365 | ||
1366 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1367 | rtime = (rtime*HZ)/1000; | |
19e16d22 HL |
1368 | if (rtime < HZ/100) |
1369 | rtime = HZ/100; | |
1f9248e5 | 1370 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1371 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1372 | send_ifinfo_notify = true; |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | rtime = ntohl(ra_msg->reachable_time); | |
1376 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1377 | rtime = (rtime*HZ)/1000; | |
1378 | ||
1379 | if (rtime < HZ/10) | |
1380 | rtime = HZ/10; | |
1381 | ||
1f9248e5 JP |
1382 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1383 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1384 | BASE_REACHABLE_TIME, rtime); | |
1385 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1386 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1387 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1388 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1389 | send_ifinfo_notify = true; |
1da177e4 LT |
1390 | } |
1391 | } | |
1392 | } | |
1393 | ||
fadf6bf0 TF |
1394 | skip_linkparms: |
1395 | ||
1da177e4 LT |
1396 | /* |
1397 | * Process options. | |
1398 | */ | |
1399 | ||
1400 | if (!neigh) | |
0660e03f | 1401 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1402 | skb->dev, 1); |
1403 | if (neigh) { | |
1404 | u8 *lladdr = NULL; | |
1405 | if (ndopts.nd_opts_src_lladdr) { | |
1406 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1407 | skb->dev); | |
1408 | if (!lladdr) { | |
675418d5 JP |
1409 | ND_PRINTK(2, warn, |
1410 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1411 | goto out; |
1412 | } | |
1413 | } | |
f997c55c | 1414 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1415 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1416 | NEIGH_UPDATE_F_OVERRIDE| | |
1417 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1418 | NEIGH_UPDATE_F_ISROUTER, |
1419 | NDISC_ROUTER_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1420 | } |
1421 | ||
f2a762d8 BG |
1422 | if (!ipv6_accept_ra(in6_dev)) { |
1423 | ND_PRINTK(2, info, | |
1424 | "RA: %s, accept_ra is false for dev: %s\n", | |
1425 | __func__, skb->dev->name); | |
31ce8c71 | 1426 | goto out; |
f2a762d8 | 1427 | } |
31ce8c71 | 1428 | |
70ceb4f5 | 1429 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1430 | if (!in6_dev->cnf.accept_ra_from_local && |
1431 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1432 | in6_dev->dev, 0)) { |
f2a762d8 | 1433 | ND_PRINTK(2, info, |
d9333196 BG |
1434 | "RA from local address detected on dev: %s: router info ignored.\n", |
1435 | skb->dev->name); | |
9f56220f | 1436 | goto skip_routeinfo; |
f2a762d8 | 1437 | } |
9f56220f | 1438 | |
09c884d4 | 1439 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1440 | struct nd_opt_hdr *p; |
1441 | for (p = ndopts.nd_opts_ri; | |
1442 | p; | |
1443 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1444 | struct route_info *ri = (struct route_info *)p; |
1445 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1446 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1447 | ri->prefix_len == 0) | |
1448 | continue; | |
1449 | #endif | |
30e56918 DJ |
1450 | if (ri->prefix_len == 0 && |
1451 | !in6_dev->cnf.accept_ra_defrtr) | |
1452 | continue; | |
bbea124b JS |
1453 | if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen) |
1454 | continue; | |
6294e000 | 1455 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1456 | continue; |
67ba4152 | 1457 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1458 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1459 | } |
1460 | } | |
9f56220f AH |
1461 | |
1462 | skip_routeinfo: | |
70ceb4f5 YH |
1463 | #endif |
1464 | ||
de357cc0 | 1465 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1466 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1467 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1468 | ND_PRINTK(2, info, | |
1469 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1470 | __func__, skb->dev->name); | |
fadf6bf0 | 1471 | goto out; |
f2a762d8 | 1472 | } |
de357cc0 | 1473 | #endif |
fadf6bf0 | 1474 | |
c4fd30eb | 1475 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1476 | struct nd_opt_hdr *p; |
1477 | for (p = ndopts.nd_opts_pi; | |
1478 | p; | |
1479 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1480 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1481 | (p->nd_opt_len) << 3, | |
1482 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1483 | } |
1484 | } | |
1485 | ||
c2943f14 | 1486 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1487 | __be32 n; |
1da177e4 LT |
1488 | u32 mtu; |
1489 | ||
67ba4152 | 1490 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1491 | mtu = ntohl(n); |
1da177e4 | 1492 | |
49b99da2 RY |
1493 | if (in6_dev->ra_mtu != mtu) { |
1494 | in6_dev->ra_mtu = mtu; | |
1495 | send_ifinfo_notify = true; | |
1496 | } | |
1497 | ||
1da177e4 | 1498 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
675418d5 | 1499 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1500 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1501 | in6_dev->cnf.mtu6 = mtu; | |
d4ead6b3 | 1502 | fib6_metric_set(rt, RTAX_MTU, mtu); |
1da177e4 LT |
1503 | rt6_mtu_change(skb->dev, mtu); |
1504 | } | |
1505 | } | |
1ab1457c | 1506 | |
31910575 | 1507 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1508 | struct nd_opt_hdr *p; |
1509 | for (p = ndopts.nd_useropts; | |
1510 | p; | |
f997c55c AA |
1511 | p = ndisc_next_useropt(skb->dev, p, |
1512 | ndopts.nd_useropts_end)) { | |
61cf46ad | 1513 | ndisc_ra_useropt(skb, p); |
31910575 PY |
1514 | } |
1515 | } | |
1516 | ||
1da177e4 | 1517 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1518 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1519 | } |
1520 | out: | |
49b99da2 RY |
1521 | /* Send a notify if RA changed managed/otherconf flags or |
1522 | * timer settings or ra_mtu value | |
1523 | */ | |
1524 | if (send_ifinfo_notify) | |
1525 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1526 | ||
93531c67 | 1527 | fib6_info_release(rt); |
eb857186 | 1528 | if (neigh) |
1da177e4 | 1529 | neigh_release(neigh); |
1da177e4 LT |
1530 | } |
1531 | ||
1532 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1533 | { | |
093d04d4 DJ |
1534 | u8 *hdr; |
1535 | struct ndisc_options ndopts; | |
1536 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1537 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1538 | offsetof(struct rd_msg, opt)); |
1539 | ||
de357cc0 | 1540 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1541 | switch (skb->ndisc_nodetype) { |
1542 | case NDISC_NODETYPE_HOST: | |
1543 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1544 | ND_PRINTK(2, warn, |
1545 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1546 | return; |
1547 | } | |
de357cc0 | 1548 | #endif |
fadf6bf0 | 1549 | |
0660e03f | 1550 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1551 | ND_PRINTK(2, warn, |
1552 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1553 | return; |
1554 | } | |
1555 | ||
f997c55c | 1556 | if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) |
093d04d4 DJ |
1557 | return; |
1558 | ||
c92a59ec | 1559 | if (!ndopts.nd_opts_rh) { |
b55b76b2 | 1560 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
d456336d | 1561 | skb->dev->ifindex); |
093d04d4 | 1562 | return; |
c92a59ec | 1563 | } |
093d04d4 DJ |
1564 | |
1565 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1566 | hdr += 8; | |
1567 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1568 | return; | |
1569 | ||
b94f1c09 | 1570 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1571 | } |
1572 | ||
5f5a0115 YH |
1573 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1574 | struct sk_buff *orig_skb, | |
1575 | int rd_len) | |
9c86dafe | 1576 | { |
5f5a0115 YH |
1577 | u8 *opt = skb_put(skb, rd_len); |
1578 | ||
9c86dafe YH |
1579 | memset(opt, 0, 8); |
1580 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1581 | *(opt++) = (rd_len >> 3); | |
1582 | opt += 6; | |
1583 | ||
9f62c15f LB |
1584 | skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt, |
1585 | rd_len - 8); | |
9c86dafe YH |
1586 | } |
1587 | ||
4991969a | 1588 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1589 | { |
1762f7e8 | 1590 | struct net_device *dev = skb->dev; |
c346dca1 | 1591 | struct net *net = dev_net(dev); |
1762f7e8 | 1592 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1593 | int optlen = 0; |
fbfe95a4 | 1594 | struct inet_peer *peer; |
1da177e4 | 1595 | struct sk_buff *buff; |
71bcdba0 | 1596 | struct rd_msg *msg; |
1da177e4 | 1597 | struct in6_addr saddr_buf; |
1da177e4 LT |
1598 | struct rt6_info *rt; |
1599 | struct dst_entry *dst; | |
4c9483b2 | 1600 | struct flowi6 fl6; |
1da177e4 | 1601 | int rd_len; |
f997c55c AA |
1602 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, |
1603 | ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; | |
1d861aa4 | 1604 | bool ret; |
1da177e4 | 1605 | |
2f17becf SS |
1606 | if (netif_is_l3_master(skb->dev)) { |
1607 | dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); | |
1608 | if (!dev) | |
1609 | return; | |
1610 | } | |
1611 | ||
95c385b4 | 1612 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1613 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1614 | dev->name); | |
1ab1457c YH |
1615 | return; |
1616 | } | |
1da177e4 | 1617 | |
0660e03f | 1618 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1619 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1620 | ND_PRINTK(2, warn, |
1621 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1622 | return; |
1623 | } | |
1624 | ||
4c9483b2 | 1625 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
e0d56fdd | 1626 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1627 | |
4c9483b2 | 1628 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1629 | if (dst->error) { |
1630 | dst_release(dst); | |
1da177e4 | 1631 | return; |
5095d64d | 1632 | } |
4c9483b2 | 1633 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1634 | if (IS_ERR(dst)) |
1da177e4 | 1635 | return; |
1da177e4 LT |
1636 | |
1637 | rt = (struct rt6_info *) dst; | |
1638 | ||
1639 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1640 | ND_PRINTK(2, warn, |
1641 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1642 | goto release; |
1da177e4 | 1643 | } |
fd0273d7 | 1644 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1645 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1646 | if (peer) | |
1647 | inet_putpeer(peer); | |
1648 | if (!ret) | |
d73f0801 | 1649 | goto release; |
1da177e4 LT |
1650 | |
1651 | if (dev->addr_len) { | |
4991969a DM |
1652 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1653 | if (!neigh) { | |
675418d5 JP |
1654 | ND_PRINTK(2, warn, |
1655 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1656 | goto release; |
1657 | } | |
1658 | ||
1da177e4 LT |
1659 | read_lock_bh(&neigh->lock); |
1660 | if (neigh->nud_state & NUD_VALID) { | |
1661 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1662 | read_unlock_bh(&neigh->lock); | |
1663 | ha = ha_buf; | |
f997c55c AA |
1664 | optlen += ndisc_redirect_opt_addr_space(dev, neigh, |
1665 | ops_data_buf, | |
1666 | &ops_data); | |
1da177e4 LT |
1667 | } else |
1668 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1669 | |
1670 | neigh_release(neigh); | |
1da177e4 LT |
1671 | } |
1672 | ||
1673 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1674 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1675 | skb->len + 8); | |
1da177e4 | 1676 | rd_len &= ~0x7; |
2ce13576 | 1677 | optlen += rd_len; |
1da177e4 | 1678 | |
2ce13576 | 1679 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1680 | if (!buff) |
d73f0801 | 1681 | goto release; |
1da177e4 | 1682 | |
4df864c1 | 1683 | msg = skb_put(buff, sizeof(*msg)); |
4d5c152e YH |
1684 | *msg = (struct rd_msg) { |
1685 | .icmph = { | |
1686 | .icmp6_type = NDISC_REDIRECT, | |
1687 | }, | |
1688 | .target = *target, | |
1689 | .dest = ipv6_hdr(skb)->daddr, | |
1690 | }; | |
1da177e4 | 1691 | |
1da177e4 LT |
1692 | /* |
1693 | * include target_address option | |
1694 | */ | |
1695 | ||
1696 | if (ha) | |
f997c55c | 1697 | ndisc_fill_redirect_addr_option(buff, ha, ops_data); |
1da177e4 LT |
1698 | |
1699 | /* | |
1700 | * build redirect option and copy skb over to the new packet. | |
1701 | */ | |
1702 | ||
9c86dafe | 1703 | if (rd_len) |
5f5a0115 | 1704 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1705 | |
adf30907 | 1706 | skb_dst_set(buff, dst); |
f4de84c6 | 1707 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1708 | return; |
1709 | ||
1710 | release: | |
1711 | dst_release(dst); | |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | static void pndisc_redo(struct sk_buff *skb) | |
1715 | { | |
140e26fc | 1716 | ndisc_recv_ns(skb); |
1da177e4 LT |
1717 | kfree_skb(skb); |
1718 | } | |
1719 | ||
8cf8821e JD |
1720 | static int ndisc_is_multicast(const void *pkey) |
1721 | { | |
1722 | return ipv6_addr_is_multicast((struct in6_addr *)pkey); | |
1723 | } | |
1724 | ||
b800c3b9 HFS |
1725 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1726 | { | |
1727 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1728 | ||
1729 | if (!idev) | |
1730 | return true; | |
1731 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1732 | idev->cnf.suppress_frag_ndisc) { | |
1733 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1734 | return true; | |
1735 | } | |
1736 | return false; | |
1737 | } | |
1738 | ||
1da177e4 LT |
1739 | int ndisc_rcv(struct sk_buff *skb) |
1740 | { | |
1741 | struct nd_msg *msg; | |
1742 | ||
b800c3b9 HFS |
1743 | if (ndisc_suppress_frag_ndisc(skb)) |
1744 | return 0; | |
1745 | ||
6bce6b4e | 1746 | if (skb_linearize(skb)) |
1da177e4 LT |
1747 | return 0; |
1748 | ||
9c70220b | 1749 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1750 | |
9c70220b | 1751 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1752 | |
0660e03f | 1753 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1754 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1755 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1756 | return 0; |
1757 | } | |
1758 | ||
1759 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1760 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1761 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1762 | return 0; |
1763 | } | |
1764 | ||
1765 | switch (msg->icmph.icmp6_type) { | |
1766 | case NDISC_NEIGHBOUR_SOLICITATION: | |
ee1abcf6 | 1767 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1da177e4 LT |
1768 | ndisc_recv_ns(skb); |
1769 | break; | |
1770 | ||
1771 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1772 | ndisc_recv_na(skb); | |
1773 | break; | |
1774 | ||
1775 | case NDISC_ROUTER_SOLICITATION: | |
1776 | ndisc_recv_rs(skb); | |
1777 | break; | |
1778 | ||
1779 | case NDISC_ROUTER_ADVERTISEMENT: | |
1780 | ndisc_router_discovery(skb); | |
1781 | break; | |
1782 | ||
1783 | case NDISC_REDIRECT: | |
1784 | ndisc_redirect_rcv(skb); | |
1785 | break; | |
3ff50b79 | 1786 | } |
1da177e4 LT |
1787 | |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1792 | { | |
351638e7 | 1793 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1794 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1795 | struct net *net = dev_net(dev); |
5cb04436 | 1796 | struct inet6_dev *idev; |
1da177e4 LT |
1797 | |
1798 | switch (event) { | |
1799 | case NETDEV_CHANGEADDR: | |
1800 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1801 | fib6_run_gc(0, net, false); |
a8eceea8 | 1802 | fallthrough; |
4a6e3c5d | 1803 | case NETDEV_UP: |
5cb04436 HFS |
1804 | idev = in6_dev_get(dev); |
1805 | if (!idev) | |
1806 | break; | |
fc1f8f4f DA |
1807 | if (idev->cnf.ndisc_notify || |
1808 | net->ipv6.devconf_all->ndisc_notify) | |
5cb04436 HFS |
1809 | ndisc_send_unsol_na(dev); |
1810 | in6_dev_put(idev); | |
1da177e4 | 1811 | break; |
c8507fb2 ED |
1812 | case NETDEV_CHANGE: |
1813 | change_info = ptr; | |
1814 | if (change_info->flags_changed & IFF_NOARP) | |
1815 | neigh_changeaddr(&nd_tbl, dev); | |
859bd2ef DA |
1816 | if (!netif_carrier_ok(dev)) |
1817 | neigh_carrier_down(&nd_tbl, dev); | |
c8507fb2 | 1818 | break; |
1da177e4 LT |
1819 | case NETDEV_DOWN: |
1820 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1821 | fib6_run_gc(0, net, false); |
1da177e4 | 1822 | break; |
f47b9464 BH |
1823 | case NETDEV_NOTIFY_PEERS: |
1824 | ndisc_send_unsol_na(dev); | |
1825 | break; | |
1da177e4 LT |
1826 | default: |
1827 | break; | |
1828 | } | |
1829 | ||
1830 | return NOTIFY_DONE; | |
1831 | } | |
1832 | ||
1833 | static struct notifier_block ndisc_netdev_notifier = { | |
1834 | .notifier_call = ndisc_netdev_event, | |
6eb79393 | 1835 | .priority = ADDRCONF_NOTIFY_PRIORITY - 5, |
1da177e4 LT |
1836 | }; |
1837 | ||
1838 | #ifdef CONFIG_SYSCTL | |
1839 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1840 | const char *func, const char *dev_name) | |
1841 | { | |
1842 | static char warncomm[TASK_COMM_LEN]; | |
1843 | static int warned; | |
1844 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1845 | strcpy(warncomm, current->comm); | |
f3213831 | 1846 | pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", |
1da177e4 LT |
1847 | warncomm, func, |
1848 | dev_name, ctl->procname, | |
1849 | dev_name, ctl->procname); | |
1850 | warned++; | |
1851 | } | |
1852 | } | |
1853 | ||
32927393 CH |
1854 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void *buffer, |
1855 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1856 | { |
1857 | struct net_device *dev = ctl->extra1; | |
1858 | struct inet6_dev *idev; | |
1859 | int ret; | |
1860 | ||
d12af679 EB |
1861 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1862 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1863 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1864 | ||
d12af679 | 1865 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1866 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1867 | |
1868 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1869 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1870 | buffer, lenp, ppos); | |
d12af679 EB |
1871 | |
1872 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1873 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1874 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1875 | buffer, lenp, ppos); | |
d12af679 | 1876 | else |
1da177e4 | 1877 | ret = -1; |
1da177e4 LT |
1878 | |
1879 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1880 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1881 | idev->nd_parms->reachable_time = | |
1882 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1883 | idev->tstamp = jiffies; |
1884 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1885 | in6_dev_put(idev); | |
1886 | } | |
1887 | return ret; | |
1888 | } | |
1889 | ||
1da177e4 LT |
1890 | |
1891 | #endif | |
1892 | ||
2c8c1e72 | 1893 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1894 | { |
1895 | struct ipv6_pinfo *np; | |
1896 | struct sock *sk; | |
1ab1457c | 1897 | int err; |
1da177e4 | 1898 | |
1ed8516f DL |
1899 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1900 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1901 | if (err < 0) { |
675418d5 JP |
1902 | ND_PRINTK(0, err, |
1903 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1904 | err); | |
1da177e4 LT |
1905 | return err; |
1906 | } | |
1907 | ||
1ed8516f | 1908 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1909 | |
1da177e4 | 1910 | np = inet6_sk(sk); |
1da177e4 LT |
1911 | np->hop_limit = 255; |
1912 | /* Do not loopback ndisc messages */ | |
1913 | np->mc_loop = 0; | |
1da177e4 | 1914 | |
1762f7e8 DL |
1915 | return 0; |
1916 | } | |
1917 | ||
2c8c1e72 | 1918 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1919 | { |
1ed8516f | 1920 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1921 | } |
1922 | ||
1923 | static struct pernet_operations ndisc_net_ops = { | |
1924 | .init = ndisc_net_init, | |
1925 | .exit = ndisc_net_exit, | |
1926 | }; | |
1927 | ||
1928 | int __init ndisc_init(void) | |
1929 | { | |
1930 | int err; | |
1931 | ||
1932 | err = register_pernet_subsys(&ndisc_net_ops); | |
1933 | if (err) | |
1934 | return err; | |
1ab1457c YH |
1935 | /* |
1936 | * Initialize the neighbour table | |
1937 | */ | |
d7480fd3 | 1938 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1939 | |
1940 | #ifdef CONFIG_SYSCTL | |
73af614a | 1941 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1942 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1943 | if (err) |
1944 | goto out_unregister_pernet; | |
1762f7e8 | 1945 | out: |
bcd081a3 | 1946 | #endif |
1762f7e8 | 1947 | return err; |
1da177e4 | 1948 | |
1762f7e8 | 1949 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1950 | out_unregister_pernet: |
1762f7e8 DL |
1951 | unregister_pernet_subsys(&ndisc_net_ops); |
1952 | goto out; | |
2c861cc6 | 1953 | #endif |
1da177e4 LT |
1954 | } |
1955 | ||
2c861cc6 MK |
1956 | int __init ndisc_late_init(void) |
1957 | { | |
1958 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1959 | } | |
1960 | ||
1961 | void ndisc_late_cleanup(void) | |
1da177e4 | 1962 | { |
36f73d0c | 1963 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1964 | } |
1965 | ||
1966 | void ndisc_cleanup(void) | |
1967 | { | |
1da177e4 LT |
1968 | #ifdef CONFIG_SYSCTL |
1969 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1970 | #endif | |
d7480fd3 | 1971 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1972 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1973 | } |