]>
Commit | Line | Data |
---|---|---|
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, | |
211da42e | 131 | [NEIGH_VAR_INTERVAL_PROBE_TIME_MS] = 5 * HZ, |
1f9248e5 | 132 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, |
eaa72dc4 | 133 | [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, |
1f9248e5 JP |
134 | [NEIGH_VAR_PROXY_QLEN] = 64, |
135 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
136 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
137 | }, | |
1da177e4 LT |
138 | }, |
139 | .gc_interval = 30 * HZ, | |
140 | .gc_thresh1 = 128, | |
141 | .gc_thresh2 = 512, | |
142 | .gc_thresh3 = 1024, | |
143 | }; | |
c4850687 | 144 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 145 | |
1a8a23d2 | 146 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, const void *data, |
cc84b3c6 | 147 | int data_len, int pad) |
1da177e4 | 148 | { |
8ec5da41 | 149 | int space = __ndisc_opt_addr_space(data_len, pad); |
5f5a0115 | 150 | u8 *opt = skb_put(skb, space); |
1da177e4 LT |
151 | |
152 | opt[0] = type; | |
153 | opt[1] = space>>3; | |
154 | ||
155 | memset(opt + 2, 0, pad); | |
156 | opt += pad; | |
157 | space -= pad; | |
158 | ||
159 | memcpy(opt+2, data, data_len); | |
160 | data_len += 2; | |
161 | opt += data_len; | |
e5d08d71 IM |
162 | space -= data_len; |
163 | if (space > 0) | |
1da177e4 | 164 | memset(opt, 0, space); |
1da177e4 | 165 | } |
cc84b3c6 | 166 | EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); |
1da177e4 | 167 | |
8ec5da41 | 168 | static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, |
1a8a23d2 | 169 | const void *data, u8 icmp6_type) |
8ec5da41 AA |
170 | { |
171 | __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, | |
172 | ndisc_addr_option_pad(skb->dev->type)); | |
f997c55c AA |
173 | ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); |
174 | } | |
175 | ||
176 | static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, | |
177 | void *ha, | |
178 | const u8 *ops_data) | |
179 | { | |
180 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); | |
181 | ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); | |
8ec5da41 AA |
182 | } |
183 | ||
1da177e4 LT |
184 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
185 | struct nd_opt_hdr *end) | |
186 | { | |
187 | int type; | |
188 | if (!cur || !end || cur >= end) | |
189 | return NULL; | |
190 | type = cur->nd_opt_type; | |
191 | do { | |
192 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 193 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 194 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
195 | } |
196 | ||
f997c55c AA |
197 | static inline int ndisc_is_useropt(const struct net_device *dev, |
198 | struct nd_opt_hdr *opt) | |
31910575 | 199 | { |
048c796b MŻ |
200 | return opt->nd_opt_type == ND_OPT_PREFIX_INFO || |
201 | opt->nd_opt_type == ND_OPT_RDNSS || | |
f997c55c | 202 | opt->nd_opt_type == ND_OPT_DNSSL || |
66b5f1c4 | 203 | opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL || |
c24a77ed | 204 | opt->nd_opt_type == ND_OPT_PREF64 || |
f997c55c | 205 | ndisc_ops_is_useropt(dev, opt->nd_opt_type); |
31910575 PY |
206 | } |
207 | ||
f997c55c AA |
208 | static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, |
209 | struct nd_opt_hdr *cur, | |
31910575 PY |
210 | struct nd_opt_hdr *end) |
211 | { | |
212 | if (!cur || !end || cur >= end) | |
213 | return NULL; | |
214 | do { | |
215 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
f997c55c AA |
216 | } while (cur < end && !ndisc_is_useropt(dev, cur)); |
217 | return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; | |
31910575 PY |
218 | } |
219 | ||
f997c55c AA |
220 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
221 | u8 *opt, int opt_len, | |
30f2a5f3 | 222 | struct ndisc_options *ndopts) |
1da177e4 LT |
223 | { |
224 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
225 | ||
226 | if (!nd_opt || opt_len < 0 || !ndopts) | |
227 | return NULL; | |
228 | memset(ndopts, 0, sizeof(*ndopts)); | |
229 | while (opt_len) { | |
230 | int l; | |
231 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
232 | return NULL; | |
233 | l = nd_opt->nd_opt_len << 3; | |
234 | if (opt_len < l || l == 0) | |
235 | return NULL; | |
f997c55c AA |
236 | if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) |
237 | goto next_opt; | |
1da177e4 LT |
238 | switch (nd_opt->nd_opt_type) { |
239 | case ND_OPT_SOURCE_LL_ADDR: | |
240 | case ND_OPT_TARGET_LL_ADDR: | |
241 | case ND_OPT_MTU: | |
adc176c5 | 242 | case ND_OPT_NONCE: |
1da177e4 LT |
243 | case ND_OPT_REDIRECT_HDR: |
244 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
245 | ND_PRINTK(2, warn, |
246 | "%s: duplicated ND6 option found: type=%d\n", | |
247 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
248 | } else { |
249 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
250 | } | |
251 | break; | |
252 | case ND_OPT_PREFIX_INFO: | |
253 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 254 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
255 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
256 | break; | |
70ceb4f5 YH |
257 | #ifdef CONFIG_IPV6_ROUTE_INFO |
258 | case ND_OPT_ROUTE_INFO: | |
259 | ndopts->nd_opts_ri_end = nd_opt; | |
260 | if (!ndopts->nd_opts_ri) | |
261 | ndopts->nd_opts_ri = nd_opt; | |
262 | break; | |
263 | #endif | |
1da177e4 | 264 | default: |
f997c55c | 265 | if (ndisc_is_useropt(dev, nd_opt)) { |
31910575 PY |
266 | ndopts->nd_useropts_end = nd_opt; |
267 | if (!ndopts->nd_useropts) | |
268 | ndopts->nd_useropts = nd_opt; | |
269 | } else { | |
270 | /* | |
271 | * Unknown options must be silently ignored, | |
272 | * to accommodate future extension to the | |
273 | * protocol. | |
274 | */ | |
675418d5 JP |
275 | ND_PRINTK(2, notice, |
276 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
277 | __func__, | |
278 | nd_opt->nd_opt_type, | |
279 | nd_opt->nd_opt_len); | |
31910575 | 280 | } |
1da177e4 | 281 | } |
f997c55c | 282 | next_opt: |
1da177e4 LT |
283 | opt_len -= l; |
284 | nd_opt = ((void *)nd_opt) + l; | |
285 | } | |
286 | return ndopts; | |
287 | } | |
288 | ||
b71d1d42 | 289 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
290 | { |
291 | switch (dev->type) { | |
292 | case ARPHRD_ETHER: | |
293 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
294 | case ARPHRD_FDDI: | |
295 | ipv6_eth_mc_map(addr, buf); | |
296 | return 0; | |
1da177e4 LT |
297 | case ARPHRD_ARCNET: |
298 | ipv6_arcnet_mc_map(addr, buf); | |
299 | return 0; | |
300 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 301 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 302 | return 0; |
93ca3bb5 TT |
303 | case ARPHRD_IPGRE: |
304 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
305 | default: |
306 | if (dir) { | |
307 | memcpy(buf, dev->broadcast, dev->addr_len); | |
308 | return 0; | |
309 | } | |
310 | } | |
311 | return -EINVAL; | |
312 | } | |
7159039a YH |
313 | EXPORT_SYMBOL(ndisc_mc_map); |
314 | ||
d6bf7817 ED |
315 | static u32 ndisc_hash(const void *pkey, |
316 | const struct net_device *dev, | |
2c2aba6c | 317 | __u32 *hash_rnd) |
1da177e4 | 318 | { |
2c2aba6c | 319 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
320 | } |
321 | ||
60395a20 EB |
322 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
323 | { | |
324 | return neigh_key_eq128(n, pkey); | |
325 | } | |
326 | ||
1da177e4 LT |
327 | static int ndisc_constructor(struct neighbour *neigh) |
328 | { | |
67ba4152 | 329 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
330 | struct net_device *dev = neigh->dev; |
331 | struct inet6_dev *in6_dev; | |
332 | struct neigh_parms *parms; | |
a50feda5 | 333 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 334 | |
1da177e4 | 335 | in6_dev = in6_dev_get(dev); |
63159f29 | 336 | if (!in6_dev) { |
1da177e4 LT |
337 | return -EINVAL; |
338 | } | |
339 | ||
340 | parms = in6_dev->nd_parms; | |
341 | __neigh_parms_put(neigh->parms); | |
342 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
343 | |
344 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 345 | if (!dev->header_ops) { |
1da177e4 LT |
346 | neigh->nud_state = NUD_NOARP; |
347 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 348 | neigh->output = neigh_direct_output; |
1da177e4 LT |
349 | } else { |
350 | if (is_multicast) { | |
351 | neigh->nud_state = NUD_NOARP; | |
352 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
353 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
354 | neigh->nud_state = NUD_NOARP; | |
355 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
356 | if (dev->flags&IFF_LOOPBACK) | |
357 | neigh->type = RTN_LOCAL; | |
358 | } else if (dev->flags&IFF_POINTOPOINT) { | |
359 | neigh->nud_state = NUD_NOARP; | |
360 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
361 | } | |
3b04ddde | 362 | if (dev->header_ops->cache) |
1da177e4 LT |
363 | neigh->ops = &ndisc_hh_ops; |
364 | else | |
365 | neigh->ops = &ndisc_generic_ops; | |
366 | if (neigh->nud_state&NUD_VALID) | |
367 | neigh->output = neigh->ops->connected_output; | |
368 | else | |
369 | neigh->output = neigh->ops->output; | |
370 | } | |
371 | in6_dev_put(in6_dev); | |
372 | return 0; | |
373 | } | |
374 | ||
375 | static int pndisc_constructor(struct pneigh_entry *n) | |
376 | { | |
67ba4152 | 377 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
378 | struct in6_addr maddr; |
379 | struct net_device *dev = n->dev; | |
380 | ||
63159f29 | 381 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
382 | return -EINVAL; |
383 | addrconf_addr_solict_mult(addr, &maddr); | |
384 | ipv6_dev_mc_inc(dev, &maddr); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | static void pndisc_destructor(struct pneigh_entry *n) | |
389 | { | |
67ba4152 | 390 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
391 | struct in6_addr maddr; |
392 | struct net_device *dev = n->dev; | |
393 | ||
63159f29 | 394 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
395 | return; |
396 | addrconf_addr_solict_mult(addr, &maddr); | |
397 | ipv6_dev_mc_dec(dev, &maddr); | |
398 | } | |
399 | ||
b8fb1ab4 DA |
400 | /* called with rtnl held */ |
401 | static bool ndisc_allow_add(const struct net_device *dev, | |
402 | struct netlink_ext_ack *extack) | |
403 | { | |
404 | struct inet6_dev *idev = __in6_dev_get(dev); | |
405 | ||
406 | if (!idev || idev->cnf.disable_ipv6) { | |
407 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device"); | |
408 | return false; | |
409 | } | |
410 | ||
411 | return true; | |
412 | } | |
413 | ||
de09334b YH |
414 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
415 | int len) | |
416 | { | |
417 | int hlen = LL_RESERVED_SPACE(dev); | |
418 | int tlen = dev->needed_tailroom; | |
419 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
420 | struct sk_buff *skb; | |
de09334b | 421 | |
25a6e6b8 | 422 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 423 | if (!skb) { |
25a6e6b8 TG |
424 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
425 | __func__); | |
de09334b YH |
426 | return NULL; |
427 | } | |
428 | ||
f382d03a YH |
429 | skb->protocol = htons(ETH_P_IPV6); |
430 | skb->dev = dev; | |
431 | ||
527a150f | 432 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 433 | skb_reset_transport_header(skb); |
de09334b | 434 | |
25a6e6b8 TG |
435 | /* Manually assign socket ownership as we avoid calling |
436 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
437 | */ | |
438 | skb_set_owner_w(skb, sk); | |
439 | ||
de09334b YH |
440 | return skb; |
441 | } | |
442 | ||
f382d03a | 443 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
444 | const struct in6_addr *saddr, |
445 | const struct in6_addr *daddr, | |
c8d6c380 | 446 | int hop_limit, int len) |
2576f17d YH |
447 | { |
448 | struct ipv6hdr *hdr; | |
2210d6b2 MŻ |
449 | struct inet6_dev *idev; |
450 | unsigned tclass; | |
451 | ||
452 | rcu_read_lock(); | |
453 | idev = __in6_dev_get(skb->dev); | |
2f0ff05a | 454 | tclass = idev ? READ_ONCE(idev->cnf.ndisc_tclass) : 0; |
2210d6b2 | 455 | rcu_read_unlock(); |
2576f17d | 456 | |
527a150f | 457 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 458 | skb_reset_network_header(skb); |
2576f17d YH |
459 | hdr = ipv6_hdr(skb); |
460 | ||
2210d6b2 | 461 | ip6_flow_hdr(hdr, tclass, 0); |
2576f17d YH |
462 | |
463 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
464 | hdr->nexthdr = IPPROTO_ICMPV6; |
465 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
466 | |
467 | hdr->saddr = *saddr; | |
468 | hdr->daddr = *daddr; | |
469 | } | |
470 | ||
696c6544 HL |
471 | void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr, |
472 | const struct in6_addr *saddr) | |
305d552a | 473 | { |
f4de84c6 | 474 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 475 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 476 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
477 | struct inet6_dev *idev; |
478 | int err; | |
aa4bdd4b | 479 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
480 | u8 type; |
481 | ||
482 | type = icmp6h->icmp6_type; | |
483 | ||
f4de84c6 | 484 | if (!dst) { |
f4de84c6 | 485 | struct flowi6 fl6; |
e0d56fdd | 486 | int oif = skb->dev->ifindex; |
305d552a | 487 | |
ca254490 | 488 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
f4de84c6 YH |
489 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
490 | if (IS_ERR(dst)) { | |
491 | kfree_skb(skb); | |
492 | return; | |
493 | } | |
494 | ||
495 | skb_dst_set(skb, dst); | |
496 | } | |
e1ec7842 | 497 | |
7b3d9b06 YH |
498 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
499 | IPPROTO_ICMPV6, | |
500 | csum_partial(icmp6h, | |
501 | skb->len, 0)); | |
502 | ||
b0adfba7 | 503 | ip6_nd_hdr(skb, saddr, daddr, READ_ONCE(inet6_sk(sk)->hop_limit), skb->len); |
7b3d9b06 | 504 | |
cfdf7647 ED |
505 | rcu_read_lock(); |
506 | idev = __in6_dev_get(dst->dev); | |
b4a11b20 | 507 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); |
e1ec7842 | 508 | |
29a26a56 EB |
509 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
510 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 511 | dst_output); |
1da177e4 | 512 | if (!err) { |
5c5d244b | 513 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 514 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
515 | } |
516 | ||
cfdf7647 | 517 | rcu_read_unlock(); |
1ab1457c | 518 | } |
696c6544 | 519 | EXPORT_SYMBOL(ndisc_send_skb); |
1da177e4 | 520 | |
38cf595b | 521 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
522 | const struct in6_addr *solicited_addr, |
523 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 524 | { |
b44b5f4a | 525 | struct sk_buff *skb; |
e1ec7842 YH |
526 | struct in6_addr tmpaddr; |
527 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 528 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
529 | struct nd_msg *msg; |
530 | int optlen = 0; | |
e1ec7842 YH |
531 | |
532 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 533 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
534 | if (ifp) { |
535 | src_addr = solicited_addr; | |
536 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 537 | override = false; |
2f0ff05a | 538 | inc_opt |= READ_ONCE(ifp->idev->cnf.force_tllao); |
e1ec7842 YH |
539 | in6_ifa_put(ifp); |
540 | } else { | |
191cd582 | 541 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 542 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 543 | &tmpaddr)) |
e1ec7842 YH |
544 | return; |
545 | src_addr = &tmpaddr; | |
546 | } | |
547 | ||
1cb3fe51 | 548 | if (!dev->addr_len) |
9a21ac94 | 549 | inc_opt = false; |
1cb3fe51 | 550 | if (inc_opt) |
f997c55c AA |
551 | optlen += ndisc_opt_addr_space(dev, |
552 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
e1ec7842 | 553 | |
1cb3fe51 | 554 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
555 | if (!skb) |
556 | return; | |
557 | ||
4df864c1 | 558 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
559 | *msg = (struct nd_msg) { |
560 | .icmph = { | |
561 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
562 | .icmp6_router = router, | |
563 | .icmp6_solicited = solicited, | |
564 | .icmp6_override = override, | |
565 | }, | |
566 | .target = *solicited_addr, | |
567 | }; | |
568 | ||
569 | if (inc_opt) | |
570 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
f997c55c AA |
571 | dev->dev_addr, |
572 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
1cb3fe51 | 573 | |
b44b5f4a | 574 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
575 | } |
576 | ||
f47b9464 BH |
577 | static void ndisc_send_unsol_na(struct net_device *dev) |
578 | { | |
579 | struct inet6_dev *idev; | |
580 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
581 | |
582 | idev = in6_dev_get(dev); | |
583 | if (!idev) | |
584 | return; | |
585 | ||
586 | read_lock_bh(&idev->lock); | |
587 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
c76fe2d9 DA |
588 | /* skip tentative addresses until dad completes */ |
589 | if (ifa->flags & IFA_F_TENTATIVE && | |
590 | !(ifa->flags & IFA_F_OPTIMISTIC)) | |
591 | continue; | |
592 | ||
38cf595b | 593 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
594 | /*router=*/ !!idev->cnf.forwarding, |
595 | /*solicited=*/ false, /*override=*/ true, | |
596 | /*inc_opt=*/ true); | |
597 | } | |
598 | read_unlock_bh(&idev->lock); | |
599 | ||
600 | in6_dev_put(idev); | |
601 | } | |
602 | ||
696c6544 HL |
603 | struct sk_buff *ndisc_ns_create(struct net_device *dev, const struct in6_addr *solicit, |
604 | const struct in6_addr *saddr, u64 nonce) | |
1da177e4 | 605 | { |
1cb3fe51 | 606 | int inc_opt = dev->addr_len; |
696c6544 | 607 | struct sk_buff *skb; |
1cb3fe51 | 608 | struct nd_msg *msg; |
696c6544 | 609 | int optlen = 0; |
1da177e4 | 610 | |
696c6544 HL |
611 | if (!saddr) |
612 | return NULL; | |
1da177e4 | 613 | |
1cb3fe51 | 614 | if (ipv6_addr_any(saddr)) |
f2f79cca | 615 | inc_opt = false; |
1cb3fe51 | 616 | if (inc_opt) |
f997c55c AA |
617 | optlen += ndisc_opt_addr_space(dev, |
618 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
619 | if (nonce != 0) |
620 | optlen += 8; | |
1cb3fe51 YH |
621 | |
622 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a | 623 | if (!skb) |
696c6544 | 624 | return NULL; |
b44b5f4a | 625 | |
4df864c1 | 626 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
627 | *msg = (struct nd_msg) { |
628 | .icmph = { | |
629 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
630 | }, | |
631 | .target = *solicit, | |
632 | }; | |
633 | ||
634 | if (inc_opt) | |
635 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
636 | dev->dev_addr, |
637 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
638 | if (nonce != 0) { |
639 | u8 *opt = skb_put(skb, 8); | |
640 | ||
641 | opt[0] = ND_OPT_NONCE; | |
642 | opt[1] = 8 >> 3; | |
643 | memcpy(opt + 2, &nonce, 6); | |
644 | } | |
1cb3fe51 | 645 | |
696c6544 HL |
646 | return skb; |
647 | } | |
648 | EXPORT_SYMBOL(ndisc_ns_create); | |
649 | ||
650 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, | |
651 | const struct in6_addr *daddr, const struct in6_addr *saddr, | |
652 | u64 nonce) | |
653 | { | |
654 | struct in6_addr addr_buf; | |
655 | struct sk_buff *skb; | |
656 | ||
657 | if (!saddr) { | |
658 | if (ipv6_get_lladdr(dev, &addr_buf, | |
659 | (IFA_F_TENTATIVE | IFA_F_OPTIMISTIC))) | |
660 | return; | |
661 | saddr = &addr_buf; | |
662 | } | |
663 | ||
664 | skb = ndisc_ns_create(dev, solicit, saddr, nonce); | |
665 | ||
666 | if (skb) | |
667 | ndisc_send_skb(skb, daddr, saddr); | |
1da177e4 LT |
668 | } |
669 | ||
9acd9f3a YH |
670 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
671 | const struct in6_addr *daddr) | |
1da177e4 | 672 | { |
b44b5f4a | 673 | struct sk_buff *skb; |
1cb3fe51 | 674 | struct rs_msg *msg; |
95c385b4 | 675 | int send_sllao = dev->addr_len; |
1cb3fe51 | 676 | int optlen = 0; |
95c385b4 NH |
677 | |
678 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
679 | /* | |
680 | * According to section 2.2 of RFC 4429, we must not | |
681 | * send router solicitations with a sllao from | |
682 | * optimistic addresses, but we may send the solicitation | |
683 | * if we don't include the sllao. So here we check | |
684 | * if our address is optimistic, and if so, we | |
bea85195 | 685 | * suppress the inclusion of the sllao. |
95c385b4 NH |
686 | */ |
687 | if (send_sllao) { | |
c346dca1 | 688 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 689 | dev, 1); |
95c385b4 NH |
690 | if (ifp) { |
691 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 692 | send_sllao = 0; |
95c385b4 | 693 | } |
ca043569 | 694 | in6_ifa_put(ifp); |
95c385b4 NH |
695 | } else { |
696 | send_sllao = 0; | |
697 | } | |
698 | } | |
699 | #endif | |
1cb3fe51 | 700 | if (send_sllao) |
f997c55c | 701 | optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); |
1cb3fe51 YH |
702 | |
703 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
704 | if (!skb) |
705 | return; | |
706 | ||
4df864c1 | 707 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
708 | *msg = (struct rs_msg) { |
709 | .icmph = { | |
710 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
711 | }, | |
712 | }; | |
713 | ||
714 | if (send_sllao) | |
715 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
716 | dev->dev_addr, |
717 | NDISC_ROUTER_SOLICITATION); | |
1cb3fe51 | 718 | |
b44b5f4a | 719 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 720 | } |
1ab1457c | 721 | |
1da177e4 LT |
722 | |
723 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
724 | { | |
725 | /* | |
726 | * "The sender MUST return an ICMP | |
727 | * destination unreachable" | |
728 | */ | |
729 | dst_link_failure(skb); | |
730 | kfree_skb(skb); | |
731 | } | |
732 | ||
733 | /* Called with locked neigh: either read or both */ | |
734 | ||
735 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
736 | { | |
737 | struct in6_addr *saddr = NULL; | |
738 | struct in6_addr mcaddr; | |
739 | struct net_device *dev = neigh->dev; | |
740 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
741 | int probes = atomic_read(&neigh->probes); | |
742 | ||
c58da4c6 | 743 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
232378e8 | 744 | dev, false, 1, |
c58da4c6 | 745 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) |
0660e03f | 746 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
747 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
748 | if (probes < 0) { | |
b071af52 | 749 | if (!(READ_ONCE(neigh->nud_state) & NUD_VALID)) { |
675418d5 JP |
750 | ND_PRINTK(1, dbg, |
751 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
752 | __func__, target); | |
1da177e4 | 753 | } |
adc176c5 | 754 | ndisc_send_ns(dev, target, target, saddr, 0); |
1f9248e5 | 755 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 756 | neigh_app_ns(neigh); |
1da177e4 LT |
757 | } else { |
758 | addrconf_addr_solict_mult(target, &mcaddr); | |
adc176c5 | 759 | ndisc_send_ns(dev, target, &mcaddr, saddr, 0); |
1da177e4 LT |
760 | } |
761 | } | |
762 | ||
0736ffc0 YH |
763 | static int pndisc_is_router(const void *pkey, |
764 | struct net_device *dev) | |
fa86d322 PE |
765 | { |
766 | struct pneigh_entry *n; | |
0736ffc0 | 767 | int ret = -1; |
fa86d322 PE |
768 | |
769 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
770 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
771 | if (n) | |
772 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
773 | read_unlock_bh(&nd_tbl.lock); |
774 | ||
0736ffc0 | 775 | return ret; |
fa86d322 PE |
776 | } |
777 | ||
f997c55c AA |
778 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
779 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
780 | struct ndisc_options *ndopts) | |
781 | { | |
7b8f7a40 | 782 | neigh_update(neigh, lladdr, new, flags, 0); |
f997c55c AA |
783 | /* report ndisc ops about neighbour update */ |
784 | ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); | |
785 | } | |
786 | ||
7c9c8913 | 787 | static enum skb_drop_reason ndisc_recv_ns(struct sk_buff *skb) |
1da177e4 | 788 | { |
9c70220b | 789 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
790 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
791 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 792 | u8 *lladdr = NULL; |
29a3cad5 | 793 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 794 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
795 | struct ndisc_options ndopts; |
796 | struct net_device *dev = skb->dev; | |
797 | struct inet6_ifaddr *ifp; | |
798 | struct inet6_dev *idev = NULL; | |
799 | struct neighbour *neigh; | |
800 | int dad = ipv6_addr_any(saddr); | |
0736ffc0 | 801 | int is_router = -1; |
7c9c8913 | 802 | SKB_DR(reason); |
adc176c5 | 803 | u64 nonce = 0; |
7c9c8913 | 804 | bool inc; |
1da177e4 | 805 | |
7c9c8913 ED |
806 | if (skb->len < sizeof(struct nd_msg)) |
807 | return SKB_DROP_REASON_PKT_TOO_SMALL; | |
115b0aa6 | 808 | |
1da177e4 | 809 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 810 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
7c9c8913 | 811 | return reason; |
1da177e4 LT |
812 | } |
813 | ||
814 | /* | |
815 | * RFC2461 7.1.1: | |
816 | * DAD has to be destined for solicited node multicast address. | |
817 | */ | |
ca97a644 | 818 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 819 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
7c9c8913 | 820 | return reason; |
1da177e4 LT |
821 | } |
822 | ||
784d4477 ED |
823 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) |
824 | return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS; | |
1da177e4 LT |
825 | |
826 | if (ndopts.nd_opts_src_lladdr) { | |
827 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
828 | if (!lladdr) { | |
675418d5 JP |
829 | ND_PRINTK(2, warn, |
830 | "NS: invalid link-layer address length\n"); | |
7c9c8913 | 831 | return reason; |
1da177e4 LT |
832 | } |
833 | ||
834 | /* RFC2461 7.1.1: | |
1ab1457c YH |
835 | * If the IP source address is the unspecified address, |
836 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
837 | * in the message. |
838 | */ | |
839 | if (dad) { | |
675418d5 JP |
840 | ND_PRINTK(2, warn, |
841 | "NS: bad DAD packet (link-layer address option)\n"); | |
7c9c8913 | 842 | return reason; |
1da177e4 LT |
843 | } |
844 | } | |
e6651599 | 845 | if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1) |
adc176c5 | 846 | memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6); |
1da177e4 LT |
847 | |
848 | inc = ipv6_addr_is_multicast(daddr); | |
849 | ||
c346dca1 | 850 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 851 | if (ifp) { |
ca254490 | 852 | have_ifp: |
95c385b4 NH |
853 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
854 | if (dad) { | |
adc176c5 EN |
855 | if (nonce != 0 && ifp->dad_nonce == nonce) { |
856 | u8 *np = (u8 *)&nonce; | |
857 | /* Matching nonce if looped back */ | |
858 | ND_PRINTK(2, notice, | |
859 | "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n", | |
860 | ifp->idev->dev->name, | |
861 | &ifp->addr, np); | |
862 | goto out; | |
863 | } | |
95c385b4 NH |
864 | /* |
865 | * We are colliding with another node | |
866 | * who is doing DAD | |
867 | * so fail our DAD process | |
868 | */ | |
da13c59b | 869 | addrconf_dad_failure(skb, ifp); |
7c9c8913 | 870 | return reason; |
95c385b4 NH |
871 | } else { |
872 | /* | |
873 | * This is not a dad solicitation. | |
874 | * If we are an optimistic node, | |
875 | * we should respond. | |
876 | * Otherwise, we should ignore it. | |
877 | */ | |
878 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 879 | goto out; |
1da177e4 | 880 | } |
1da177e4 LT |
881 | } |
882 | ||
883 | idev = ifp->idev; | |
884 | } else { | |
53b7997f YH |
885 | struct net *net = dev_net(dev); |
886 | ||
ca254490 DA |
887 | /* perhaps an address on the master device */ |
888 | if (netif_is_l3_slave(dev)) { | |
889 | struct net_device *mdev; | |
890 | ||
891 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
892 | if (mdev) { | |
893 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
894 | if (ifp) | |
895 | goto have_ifp; | |
896 | } | |
897 | } | |
898 | ||
1da177e4 LT |
899 | idev = in6_dev_get(dev); |
900 | if (!idev) { | |
901 | /* XXX: count this drop? */ | |
7c9c8913 | 902 | return reason; |
1da177e4 LT |
903 | } |
904 | ||
53b7997f | 905 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
32f75417 | 906 | (READ_ONCE(idev->cnf.forwarding) && |
a8fbd4d9 ED |
907 | (READ_ONCE(net->ipv6.devconf_all->proxy_ndp) || |
908 | READ_ONCE(idev->cnf.proxy_ndp)) && | |
0736ffc0 | 909 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 910 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 911 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 912 | inc && |
1f9248e5 | 913 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
914 | /* |
915 | * for anycast or proxy, | |
1ab1457c YH |
916 | * sender should delay its response |
917 | * by a random time between 0 and | |
1da177e4 LT |
918 | * MAX_ANYCAST_DELAY_TIME seconds. |
919 | * (RFC2461) -- yoshfuji | |
920 | */ | |
921 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
922 | if (n) | |
923 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
924 | goto out; | |
925 | } | |
c34b8bb1 ED |
926 | } else { |
927 | SKB_DR_SET(reason, IPV6_NDISC_NS_OTHERHOST); | |
1da177e4 | 928 | goto out; |
c34b8bb1 | 929 | } |
1da177e4 LT |
930 | } |
931 | ||
0736ffc0 | 932 | if (is_router < 0) |
32f75417 | 933 | is_router = READ_ONCE(idev->cnf.forwarding); |
62dd9318 | 934 | |
1da177e4 | 935 | if (dad) { |
38cf595b | 936 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 937 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
938 | goto out; |
939 | } | |
940 | ||
941 | if (inc) | |
942 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
943 | else | |
944 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
945 | ||
1ab1457c | 946 | /* |
1da177e4 LT |
947 | * update / create cache entry |
948 | * for the source address | |
949 | */ | |
950 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
951 | !inc || lladdr || !dev->addr_len); | |
952 | if (neigh) | |
f997c55c | 953 | ndisc_update(dev, neigh, lladdr, NUD_STALE, |
1da177e4 | 954 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
f997c55c AA |
955 | NEIGH_UPDATE_F_OVERRIDE, |
956 | NDISC_NEIGHBOUR_SOLICITATION, &ndopts); | |
3b04ddde | 957 | if (neigh || !dev->header_ops) { |
38cf595b | 958 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 959 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
960 | if (neigh) |
961 | neigh_release(neigh); | |
7c9c8913 | 962 | reason = SKB_CONSUMED; |
1da177e4 LT |
963 | } |
964 | ||
965 | out: | |
966 | if (ifp) | |
967 | in6_ifa_put(ifp); | |
968 | else | |
969 | in6_dev_put(idev); | |
7c9c8913 | 970 | return reason; |
1da177e4 LT |
971 | } |
972 | ||
aaa5f515 JP |
973 | static int accept_untracked_na(struct net_device *dev, struct in6_addr *saddr) |
974 | { | |
975 | struct inet6_dev *idev = __in6_dev_get(dev); | |
976 | ||
2f0ff05a | 977 | switch (READ_ONCE(idev->cnf.accept_untracked_na)) { |
aaa5f515 JP |
978 | case 0: /* Don't accept untracked na (absent in neighbor cache) */ |
979 | return 0; | |
980 | case 1: /* Create new entries from na if currently untracked */ | |
981 | return 1; | |
982 | case 2: /* Create new entries from untracked na only if saddr is in the | |
983 | * same subnet as an address configured on the interface that | |
984 | * received the na | |
985 | */ | |
986 | return !!ipv6_chk_prefix(saddr, dev); | |
987 | default: | |
988 | return 0; | |
989 | } | |
990 | } | |
991 | ||
3009f9ae | 992 | static enum skb_drop_reason ndisc_recv_na(struct sk_buff *skb) |
1da177e4 | 993 | { |
9c70220b | 994 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 995 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 996 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 997 | u8 *lladdr = NULL; |
29a3cad5 | 998 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 999 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
1000 | struct ndisc_options ndopts; |
1001 | struct net_device *dev = skb->dev; | |
7a02bf89 | 1002 | struct inet6_dev *idev = __in6_dev_get(dev); |
1da177e4 LT |
1003 | struct inet6_ifaddr *ifp; |
1004 | struct neighbour *neigh; | |
3009f9ae | 1005 | SKB_DR(reason); |
3e0b8f52 | 1006 | u8 new_state; |
1da177e4 | 1007 | |
3009f9ae ED |
1008 | if (skb->len < sizeof(struct nd_msg)) |
1009 | return SKB_DROP_REASON_PKT_TOO_SMALL; | |
1da177e4 LT |
1010 | |
1011 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 1012 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
3009f9ae | 1013 | return reason; |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | if (ipv6_addr_is_multicast(daddr) && | |
1017 | msg->icmph.icmp6_solicited) { | |
675418d5 | 1018 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
3009f9ae | 1019 | return reason; |
1da177e4 | 1020 | } |
1ab1457c | 1021 | |
7a02bf89 JB |
1022 | /* For some 802.11 wireless deployments (and possibly other networks), |
1023 | * there will be a NA proxy and unsolicitd packets are attacks | |
1024 | * and thus should not be accepted. | |
3e0b8f52 | 1025 | * drop_unsolicited_na takes precedence over accept_untracked_na |
7a02bf89 JB |
1026 | */ |
1027 | if (!msg->icmph.icmp6_solicited && idev && | |
2f0ff05a | 1028 | READ_ONCE(idev->cnf.drop_unsolicited_na)) |
3009f9ae | 1029 | return reason; |
7a02bf89 | 1030 | |
784d4477 ED |
1031 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) |
1032 | return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS; | |
1033 | ||
1da177e4 LT |
1034 | if (ndopts.nd_opts_tgt_lladdr) { |
1035 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
1036 | if (!lladdr) { | |
675418d5 JP |
1037 | ND_PRINTK(2, warn, |
1038 | "NA: invalid link-layer address length\n"); | |
3009f9ae | 1039 | return reason; |
1da177e4 LT |
1040 | } |
1041 | } | |
c346dca1 | 1042 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 1043 | if (ifp) { |
bd015928 DW |
1044 | if (skb->pkt_type != PACKET_LOOPBACK |
1045 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
da13c59b | 1046 | addrconf_dad_failure(skb, ifp); |
3009f9ae | 1047 | return reason; |
1da177e4 LT |
1048 | } |
1049 | /* What should we make now? The advertisement | |
1050 | is invalid, but ndisc specs say nothing | |
1051 | about it. It could be misconfiguration, or | |
1052 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
1053 | |
1054 | We should not print the error if NA has been | |
1055 | received from loopback - it is just our own | |
1056 | unsolicited advertisement. | |
1da177e4 | 1057 | */ |
24fc7b86 | 1058 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 | 1059 | ND_PRINTK(1, warn, |
da13c59b VP |
1060 | "NA: %pM advertised our address %pI6c on %s!\n", |
1061 | eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name); | |
1da177e4 | 1062 | in6_ifa_put(ifp); |
3009f9ae | 1063 | return reason; |
1da177e4 | 1064 | } |
3e0b8f52 AA |
1065 | |
1066 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
1067 | ||
f9a2fb73 | 1068 | /* RFC 9131 updates original Neighbour Discovery RFC 4861. |
3e0b8f52 AA |
1069 | * NAs with Target LL Address option without a corresponding |
1070 | * entry in the neighbour cache can now create a STALE neighbour | |
1071 | * cache entry on routers. | |
1072 | * | |
1073 | * entry accept fwding solicited behaviour | |
1074 | * ------- ------ ------ --------- ---------------------- | |
1075 | * present X X 0 Set state to STALE | |
1076 | * present X X 1 Set state to REACHABLE | |
1077 | * absent 0 X X Do nothing | |
1078 | * absent 1 0 X Do nothing | |
1079 | * absent 1 1 X Add a new STALE entry | |
f9a2fb73 | 1080 | * |
f9a2fb73 AA |
1081 | * Note that we don't do a (daddr == all-routers-mcast) check. |
1082 | */ | |
3e0b8f52 | 1083 | new_state = msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE; |
32f75417 | 1084 | if (!neigh && lladdr && idev && READ_ONCE(idev->cnf.forwarding)) { |
aaa5f515 JP |
1085 | if (accept_untracked_na(dev, saddr)) { |
1086 | neigh = neigh_create(&nd_tbl, &msg->target, dev); | |
1087 | new_state = NUD_STALE; | |
1088 | } | |
3e0b8f52 | 1089 | } |
1da177e4 | 1090 | |
3e0b8f52 | 1091 | if (neigh && !IS_ERR(neigh)) { |
1da177e4 | 1092 | u8 old_flags = neigh->flags; |
53b7997f | 1093 | struct net *net = dev_net(dev); |
1da177e4 | 1094 | |
b071af52 | 1095 | if (READ_ONCE(neigh->nud_state) & NUD_FAILED) |
1da177e4 LT |
1096 | goto out; |
1097 | ||
5f3e6e9e VN |
1098 | /* |
1099 | * Don't update the neighbor cache entry on a proxy NA from | |
1100 | * ourselves because either the proxied node is off link or it | |
1101 | * has already sent a NA to us. | |
1102 | */ | |
1103 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
32f75417 | 1104 | READ_ONCE(net->ipv6.devconf_all->forwarding) && |
a8fbd4d9 | 1105 | READ_ONCE(net->ipv6.devconf_all->proxy_ndp) && |
53b7997f | 1106 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { |
b20b6d97 | 1107 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 1108 | goto out; |
fbea49e1 | 1109 | } |
5f3e6e9e | 1110 | |
f997c55c | 1111 | ndisc_update(dev, neigh, lladdr, |
3e0b8f52 | 1112 | new_state, |
1da177e4 LT |
1113 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1114 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1115 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1116 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), |
1117 | NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1118 | |
1119 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1120 | /* | |
1121 | * Change: router to host | |
1122 | */ | |
be7a010d | 1123 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 | 1124 | } |
3009f9ae | 1125 | reason = SKB_CONSUMED; |
1da177e4 LT |
1126 | out: |
1127 | neigh_release(neigh); | |
1128 | } | |
3009f9ae | 1129 | return reason; |
1da177e4 LT |
1130 | } |
1131 | ||
243e37c6 | 1132 | static enum skb_drop_reason ndisc_recv_rs(struct sk_buff *skb) |
1da177e4 | 1133 | { |
9c70220b | 1134 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1135 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1136 | struct neighbour *neigh; | |
1137 | struct inet6_dev *idev; | |
b71d1d42 | 1138 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1139 | struct ndisc_options ndopts; |
1140 | u8 *lladdr = NULL; | |
243e37c6 | 1141 | SKB_DR(reason); |
1da177e4 LT |
1142 | |
1143 | if (skb->len < sizeof(*rs_msg)) | |
243e37c6 | 1144 | return SKB_DROP_REASON_PKT_TOO_SMALL; |
1da177e4 | 1145 | |
cfdf7647 | 1146 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 1147 | if (!idev) { |
675418d5 | 1148 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
243e37c6 | 1149 | return reason; |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | /* Don't accept RS if we're not in router mode */ | |
32f75417 | 1153 | if (!READ_ONCE(idev->cnf.forwarding)) |
1da177e4 LT |
1154 | goto out; |
1155 | ||
1156 | /* | |
1157 | * Don't update NCE if src = ::; | |
1158 | * this implies that the source node has no ip address assigned yet. | |
1159 | */ | |
1160 | if (ipv6_addr_any(saddr)) | |
1161 | goto out; | |
1162 | ||
1163 | /* Parse ND options */ | |
784d4477 ED |
1164 | if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) |
1165 | return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS; | |
1da177e4 LT |
1166 | |
1167 | if (ndopts.nd_opts_src_lladdr) { | |
1168 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1169 | skb->dev); | |
1170 | if (!lladdr) | |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1175 | if (neigh) { | |
f997c55c | 1176 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1177 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1178 | NEIGH_UPDATE_F_OVERRIDE| | |
f997c55c AA |
1179 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER, |
1180 | NDISC_ROUTER_SOLICITATION, &ndopts); | |
1da177e4 | 1181 | neigh_release(neigh); |
243e37c6 | 1182 | reason = SKB_CONSUMED; |
1da177e4 LT |
1183 | } |
1184 | out: | |
243e37c6 | 1185 | return reason; |
1da177e4 LT |
1186 | } |
1187 | ||
31910575 PY |
1188 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1189 | { | |
1190 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1191 | struct sk_buff *skb; | |
1192 | struct nlmsghdr *nlh; | |
1193 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1194 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1195 | int err; |
1196 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1197 | + (opt->nd_opt_len << 3)); | |
1198 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1199 | ||
1200 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1201 | if (!skb) { |
31910575 PY |
1202 | err = -ENOBUFS; |
1203 | goto errout; | |
1204 | } | |
1205 | ||
1206 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1207 | if (!nlh) { |
31910575 PY |
1208 | goto nla_put_failure; |
1209 | } | |
1210 | ||
1211 | ndmsg = nlmsg_data(nlh); | |
1212 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1213 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1214 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1215 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1216 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1217 | ||
1218 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1219 | ||
930345ea | 1220 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1221 | goto nla_put_failure; |
31910575 PY |
1222 | nlmsg_end(skb, nlh); |
1223 | ||
1ce85fe4 | 1224 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1225 | return; |
1226 | ||
1227 | nla_put_failure: | |
1228 | nlmsg_free(skb); | |
1229 | err = -EMSGSIZE; | |
1230 | errout: | |
a18bc695 | 1231 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1232 | } |
1233 | ||
2f326d9d | 1234 | static enum skb_drop_reason ndisc_router_discovery(struct sk_buff *skb) |
1da177e4 | 1235 | { |
9c70220b | 1236 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
2f326d9d | 1237 | bool send_ifinfo_notify = false; |
1da177e4 | 1238 | struct neighbour *neigh = NULL; |
2f326d9d | 1239 | struct ndisc_options ndopts; |
8d1c802b | 1240 | struct fib6_info *rt = NULL; |
2f326d9d | 1241 | struct inet6_dev *in6_dev; |
5eb902b8 | 1242 | struct fib6_table *table; |
6b2e04bc | 1243 | u32 defrtr_usr_metric; |
2f326d9d ED |
1244 | unsigned int pref = 0; |
1245 | __u32 old_if_flags; | |
afb1d4b5 | 1246 | struct net *net; |
2f326d9d | 1247 | SKB_DR(reason); |
1da177e4 | 1248 | int lifetime; |
1da177e4 LT |
1249 | int optlen; |
1250 | ||
67ba4152 | 1251 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1252 | |
29a3cad5 SH |
1253 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1254 | sizeof(struct ra_msg); | |
1da177e4 | 1255 | |
f2a762d8 BG |
1256 | ND_PRINTK(2, info, |
1257 | "RA: %s, dev: %s\n", | |
1258 | __func__, skb->dev->name); | |
0660e03f | 1259 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1260 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
2f326d9d | 1261 | return reason; |
1da177e4 | 1262 | } |
2f326d9d ED |
1263 | if (optlen < 0) |
1264 | return SKB_DROP_REASON_PKT_TOO_SMALL; | |
1da177e4 | 1265 | |
de357cc0 | 1266 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1267 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1268 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
2f326d9d | 1269 | return reason; |
fadf6bf0 | 1270 | } |
de357cc0 | 1271 | #endif |
fadf6bf0 | 1272 | |
cfdf7647 | 1273 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1274 | if (!in6_dev) { |
675418d5 JP |
1275 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1276 | skb->dev->name); | |
2f326d9d | 1277 | return reason; |
1da177e4 | 1278 | } |
1da177e4 | 1279 | |
784d4477 ED |
1280 | if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) |
1281 | return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS; | |
1da177e4 | 1282 | |
f2a762d8 BG |
1283 | if (!ipv6_accept_ra(in6_dev)) { |
1284 | ND_PRINTK(2, info, | |
1285 | "RA: %s, did not accept ra for dev: %s\n", | |
1286 | __func__, skb->dev->name); | |
31ce8c71 | 1287 | goto skip_linkparms; |
f2a762d8 | 1288 | } |
31ce8c71 | 1289 | |
de357cc0 | 1290 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1291 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1292 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1293 | ND_PRINTK(2, info, | |
1294 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1295 | __func__, skb->dev->name); | |
fadf6bf0 | 1296 | goto skip_linkparms; |
f2a762d8 | 1297 | } |
de357cc0 | 1298 | #endif |
fadf6bf0 | 1299 | |
1da177e4 LT |
1300 | if (in6_dev->if_flags & IF_RS_SENT) { |
1301 | /* | |
1302 | * flag that an RA was received after an RS was sent | |
1303 | * out on this interface. | |
1304 | */ | |
1305 | in6_dev->if_flags |= IF_RA_RCVD; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Remember the managed/otherconf flags from most recently | |
1310 | * received RA message (RFC 2462) -- yoshfuji | |
1311 | */ | |
a394eef5 | 1312 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1313 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1314 | IF_RA_OTHERCONF)) | | |
1315 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1316 | IF_RA_MANAGED : 0) | | |
1317 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1318 | IF_RA_OTHERCONF : 0); | |
1319 | ||
a394eef5 | 1320 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1321 | send_ifinfo_notify = true; |
a394eef5 | 1322 | |
ddea75d3 | 1323 | if (!READ_ONCE(in6_dev->cnf.accept_ra_defrtr)) { |
f2a762d8 BG |
1324 | ND_PRINTK(2, info, |
1325 | "RA: %s, defrtr is false for dev: %s\n", | |
1326 | __func__, skb->dev->name); | |
65f5c7c1 | 1327 | goto skip_defrtr; |
f2a762d8 | 1328 | } |
65f5c7c1 | 1329 | |
5027d54a | 1330 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
ddea75d3 ED |
1331 | if (lifetime != 0 && |
1332 | lifetime < READ_ONCE(in6_dev->cnf.accept_ra_min_lft)) { | |
5027d54a PR |
1333 | ND_PRINTK(2, info, |
1334 | "RA: router lifetime (%ds) is too short: %s\n", | |
1335 | lifetime, skb->dev->name); | |
1336 | goto skip_defrtr; | |
1337 | } | |
1338 | ||
d9333196 BG |
1339 | /* Do not accept RA with source-addr found on local machine unless |
1340 | * accept_ra_from_local is set to true. | |
1341 | */ | |
afb1d4b5 | 1342 | net = dev_net(in6_dev->dev); |
ddea75d3 | 1343 | if (!READ_ONCE(in6_dev->cnf.accept_ra_from_local) && |
afb1d4b5 | 1344 | ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) { |
f2a762d8 | 1345 | ND_PRINTK(2, info, |
d9333196 BG |
1346 | "RA from local address detected on dev: %s: default router ignored\n", |
1347 | skb->dev->name); | |
9f56220f | 1348 | goto skip_defrtr; |
f2a762d8 | 1349 | } |
9f56220f | 1350 | |
ebacaaa0 YH |
1351 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1352 | pref = ra_msg->icmph.icmp6_router_pref; | |
1353 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1354 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
ddea75d3 | 1355 | !READ_ONCE(in6_dev->cnf.accept_ra_rtr_pref)) |
ebacaaa0 YH |
1356 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1357 | #endif | |
f88d8ea6 | 1358 | /* routes added from RAs do not use nexthop objects */ |
afb1d4b5 | 1359 | rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev); |
eb857186 | 1360 | if (rt) { |
1cf844c7 DA |
1361 | neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, |
1362 | rt->fib6_nh->fib_nh_dev, NULL, | |
f8a1b43b | 1363 | &ipv6_hdr(skb)->saddr); |
eb857186 | 1364 | if (!neigh) { |
675418d5 JP |
1365 | ND_PRINTK(0, err, |
1366 | "RA: %s got default router without neighbour\n", | |
1367 | __func__); | |
93531c67 | 1368 | fib6_info_release(rt); |
2f326d9d | 1369 | return reason; |
eb857186 DM |
1370 | } |
1371 | } | |
6b2e04bc PC |
1372 | /* Set default route metric as specified by user */ |
1373 | defrtr_usr_metric = in6_dev->cnf.ra_defrtr_metric; | |
1374 | /* delete the route if lifetime is 0 or if metric needs change */ | |
1375 | if (rt && (lifetime == 0 || rt->fib6_metric != defrtr_usr_metric)) { | |
11dd74b3 | 1376 | ip6_del_rt(net, rt, false); |
1da177e4 LT |
1377 | rt = NULL; |
1378 | } | |
1379 | ||
6b2e04bc PC |
1380 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, metric: %d, for dev: %s\n", |
1381 | rt, lifetime, defrtr_usr_metric, skb->dev->name); | |
63159f29 | 1382 | if (!rt && lifetime) { |
f2a762d8 | 1383 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1384 | |
7396ba87 XX |
1385 | if (neigh) |
1386 | neigh_release(neigh); | |
1387 | ||
afb1d4b5 | 1388 | rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr, |
129e406e KFL |
1389 | skb->dev, pref, defrtr_usr_metric, |
1390 | lifetime); | |
63159f29 | 1391 | if (!rt) { |
675418d5 JP |
1392 | ND_PRINTK(0, err, |
1393 | "RA: %s failed to add default route\n", | |
1394 | __func__); | |
2f326d9d | 1395 | return reason; |
1da177e4 LT |
1396 | } |
1397 | ||
1cf844c7 DA |
1398 | neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, |
1399 | rt->fib6_nh->fib_nh_dev, NULL, | |
f8a1b43b | 1400 | &ipv6_hdr(skb)->saddr); |
63159f29 | 1401 | if (!neigh) { |
675418d5 JP |
1402 | ND_PRINTK(0, err, |
1403 | "RA: %s got default router without neighbour\n", | |
1404 | __func__); | |
93531c67 | 1405 | fib6_info_release(rt); |
2f326d9d | 1406 | return reason; |
1da177e4 LT |
1407 | } |
1408 | neigh->flags |= NTF_ROUTER; | |
806c37dd KN |
1409 | } else if (rt && IPV6_EXTRACT_PREF(rt->fib6_flags) != pref) { |
1410 | struct nl_info nlinfo = { | |
1411 | .nl_net = net, | |
1412 | }; | |
93c2fb25 | 1413 | rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
806c37dd | 1414 | inet6_rt_notify(RTM_NEWROUTE, rt, &nlinfo, NLM_F_REPLACE); |
1da177e4 LT |
1415 | } |
1416 | ||
5eb902b8 KFL |
1417 | if (rt) { |
1418 | table = rt->fib6_table; | |
1419 | spin_lock_bh(&table->tb6_lock); | |
1420 | ||
14895687 | 1421 | fib6_set_expires(rt, jiffies + (HZ * lifetime)); |
5eb902b8 KFL |
1422 | fib6_add_gc_list(rt); |
1423 | ||
1424 | spin_unlock_bh(&table->tb6_lock); | |
1425 | } | |
ddea75d3 | 1426 | if (READ_ONCE(in6_dev->cnf.accept_ra_min_hop_limit) < 256 && |
8013d1d7 | 1427 | ra_msg->icmph.icmp6_hop_limit) { |
ddea75d3 ED |
1428 | if (READ_ONCE(in6_dev->cnf.accept_ra_min_hop_limit) <= |
1429 | ra_msg->icmph.icmp6_hop_limit) { | |
1430 | WRITE_ONCE(in6_dev->cnf.hop_limit, | |
1431 | ra_msg->icmph.icmp6_hop_limit); | |
d4ead6b3 DA |
1432 | fib6_metric_set(rt, RTAX_HOPLIMIT, |
1433 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1434 | } else { |
8013d1d7 | 1435 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1436 | } |
1da177e4 LT |
1437 | } |
1438 | ||
65f5c7c1 YH |
1439 | skip_defrtr: |
1440 | ||
1da177e4 LT |
1441 | /* |
1442 | * Update Reachable Time and Retrans Timer | |
1443 | */ | |
1444 | ||
1445 | if (in6_dev->nd_parms) { | |
1446 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1447 | ||
1448 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1449 | rtime = (rtime*HZ)/1000; | |
19e16d22 HL |
1450 | if (rtime < HZ/100) |
1451 | rtime = HZ/100; | |
1f9248e5 | 1452 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1453 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1454 | send_ifinfo_notify = true; |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | rtime = ntohl(ra_msg->reachable_time); | |
1458 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1459 | rtime = (rtime*HZ)/1000; | |
1460 | ||
1461 | if (rtime < HZ/10) | |
1462 | rtime = HZ/10; | |
1463 | ||
1f9248e5 JP |
1464 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1465 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1466 | BASE_REACHABLE_TIME, rtime); | |
1467 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1468 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1469 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1470 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1471 | send_ifinfo_notify = true; |
1da177e4 LT |
1472 | } |
1473 | } | |
1474 | } | |
1475 | ||
fadf6bf0 TF |
1476 | skip_linkparms: |
1477 | ||
1da177e4 LT |
1478 | /* |
1479 | * Process options. | |
1480 | */ | |
1481 | ||
1482 | if (!neigh) | |
0660e03f | 1483 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1484 | skb->dev, 1); |
1485 | if (neigh) { | |
1486 | u8 *lladdr = NULL; | |
1487 | if (ndopts.nd_opts_src_lladdr) { | |
1488 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1489 | skb->dev); | |
1490 | if (!lladdr) { | |
675418d5 JP |
1491 | ND_PRINTK(2, warn, |
1492 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1493 | goto out; |
1494 | } | |
1495 | } | |
f997c55c | 1496 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1497 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1498 | NEIGH_UPDATE_F_OVERRIDE| | |
1499 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1500 | NEIGH_UPDATE_F_ISROUTER, |
1501 | NDISC_ROUTER_ADVERTISEMENT, &ndopts); | |
2f326d9d | 1502 | reason = SKB_CONSUMED; |
1da177e4 LT |
1503 | } |
1504 | ||
f2a762d8 BG |
1505 | if (!ipv6_accept_ra(in6_dev)) { |
1506 | ND_PRINTK(2, info, | |
1507 | "RA: %s, accept_ra is false for dev: %s\n", | |
1508 | __func__, skb->dev->name); | |
31ce8c71 | 1509 | goto out; |
f2a762d8 | 1510 | } |
31ce8c71 | 1511 | |
70ceb4f5 | 1512 | #ifdef CONFIG_IPV6_ROUTE_INFO |
ddea75d3 | 1513 | if (!READ_ONCE(in6_dev->cnf.accept_ra_from_local) && |
b6428817 | 1514 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, |
c1a9a291 | 1515 | in6_dev->dev, 0)) { |
f2a762d8 | 1516 | ND_PRINTK(2, info, |
d9333196 BG |
1517 | "RA from local address detected on dev: %s: router info ignored.\n", |
1518 | skb->dev->name); | |
9f56220f | 1519 | goto skip_routeinfo; |
f2a762d8 | 1520 | } |
9f56220f | 1521 | |
ddea75d3 | 1522 | if (READ_ONCE(in6_dev->cnf.accept_ra_rtr_pref) && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1523 | struct nd_opt_hdr *p; |
1524 | for (p = ndopts.nd_opts_ri; | |
1525 | p; | |
1526 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1527 | struct route_info *ri = (struct route_info *)p; |
1528 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1529 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1530 | ri->prefix_len == 0) | |
1531 | continue; | |
1532 | #endif | |
30e56918 | 1533 | if (ri->prefix_len == 0 && |
ddea75d3 | 1534 | !READ_ONCE(in6_dev->cnf.accept_ra_defrtr)) |
30e56918 | 1535 | continue; |
5027d54a | 1536 | if (ri->lifetime != 0 && |
ddea75d3 | 1537 | ntohl(ri->lifetime) < READ_ONCE(in6_dev->cnf.accept_ra_min_lft)) |
5027d54a | 1538 | continue; |
ddea75d3 | 1539 | if (ri->prefix_len < READ_ONCE(in6_dev->cnf.accept_ra_rt_info_min_plen)) |
bbea124b | 1540 | continue; |
ddea75d3 | 1541 | if (ri->prefix_len > READ_ONCE(in6_dev->cnf.accept_ra_rt_info_max_plen)) |
09c884d4 | 1542 | continue; |
67ba4152 | 1543 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1544 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1545 | } |
1546 | } | |
9f56220f AH |
1547 | |
1548 | skip_routeinfo: | |
70ceb4f5 YH |
1549 | #endif |
1550 | ||
de357cc0 | 1551 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1552 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1553 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1554 | ND_PRINTK(2, info, | |
1555 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1556 | __func__, skb->dev->name); | |
fadf6bf0 | 1557 | goto out; |
f2a762d8 | 1558 | } |
de357cc0 | 1559 | #endif |
fadf6bf0 | 1560 | |
ddea75d3 | 1561 | if (READ_ONCE(in6_dev->cnf.accept_ra_pinfo) && ndopts.nd_opts_pi) { |
1da177e4 LT |
1562 | struct nd_opt_hdr *p; |
1563 | for (p = ndopts.nd_opts_pi; | |
1564 | p; | |
1565 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1566 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1567 | (p->nd_opt_len) << 3, | |
1568 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1569 | } |
1570 | } | |
1571 | ||
ddea75d3 | 1572 | if (ndopts.nd_opts_mtu && READ_ONCE(in6_dev->cnf.accept_ra_mtu)) { |
e69a4adc | 1573 | __be32 n; |
1da177e4 LT |
1574 | u32 mtu; |
1575 | ||
67ba4152 | 1576 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1577 | mtu = ntohl(n); |
1da177e4 | 1578 | |
49b99da2 RY |
1579 | if (in6_dev->ra_mtu != mtu) { |
1580 | in6_dev->ra_mtu = mtu; | |
1581 | send_ifinfo_notify = true; | |
1582 | } | |
1583 | ||
1da177e4 | 1584 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
675418d5 | 1585 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
e7135f48 ED |
1586 | } else if (READ_ONCE(in6_dev->cnf.mtu6) != mtu) { |
1587 | WRITE_ONCE(in6_dev->cnf.mtu6, mtu); | |
d4ead6b3 | 1588 | fib6_metric_set(rt, RTAX_MTU, mtu); |
1da177e4 LT |
1589 | rt6_mtu_change(skb->dev, mtu); |
1590 | } | |
1591 | } | |
1ab1457c | 1592 | |
31910575 | 1593 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1594 | struct nd_opt_hdr *p; |
1595 | for (p = ndopts.nd_useropts; | |
1596 | p; | |
f997c55c AA |
1597 | p = ndisc_next_useropt(skb->dev, p, |
1598 | ndopts.nd_useropts_end)) { | |
61cf46ad | 1599 | ndisc_ra_useropt(skb, p); |
31910575 PY |
1600 | } |
1601 | } | |
1602 | ||
1da177e4 | 1603 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1604 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1605 | } |
1606 | out: | |
49b99da2 RY |
1607 | /* Send a notify if RA changed managed/otherconf flags or |
1608 | * timer settings or ra_mtu value | |
1609 | */ | |
1610 | if (send_ifinfo_notify) | |
1611 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1612 | ||
93531c67 | 1613 | fib6_info_release(rt); |
eb857186 | 1614 | if (neigh) |
1da177e4 | 1615 | neigh_release(neigh); |
2f326d9d | 1616 | return reason; |
1da177e4 LT |
1617 | } |
1618 | ||
ec993edf | 1619 | static enum skb_drop_reason ndisc_redirect_rcv(struct sk_buff *skb) |
1da177e4 | 1620 | { |
093d04d4 | 1621 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); |
29a3cad5 | 1622 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 | 1623 | offsetof(struct rd_msg, opt)); |
ec993edf ED |
1624 | struct ndisc_options ndopts; |
1625 | SKB_DR(reason); | |
1626 | u8 *hdr; | |
093d04d4 | 1627 | |
de357cc0 | 1628 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1629 | switch (skb->ndisc_nodetype) { |
1630 | case NDISC_NODETYPE_HOST: | |
1631 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1632 | ND_PRINTK(2, warn, |
1633 | "Redirect: from host or unauthorized router\n"); | |
ec993edf | 1634 | return reason; |
fadf6bf0 | 1635 | } |
de357cc0 | 1636 | #endif |
fadf6bf0 | 1637 | |
0660e03f | 1638 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1639 | ND_PRINTK(2, warn, |
1640 | "Redirect: source address is not link-local\n"); | |
ec993edf | 1641 | return reason; |
1da177e4 LT |
1642 | } |
1643 | ||
f997c55c | 1644 | if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) |
784d4477 | 1645 | return SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS; |
093d04d4 | 1646 | |
c92a59ec | 1647 | if (!ndopts.nd_opts_rh) { |
b55b76b2 | 1648 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
d456336d | 1649 | skb->dev->ifindex); |
ec993edf | 1650 | return reason; |
c92a59ec | 1651 | } |
093d04d4 DJ |
1652 | |
1653 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1654 | hdr += 8; | |
1655 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
ec993edf | 1656 | return SKB_DROP_REASON_PKT_TOO_SMALL; |
093d04d4 | 1657 | |
ec993edf | 1658 | return icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1659 | } |
1660 | ||
5f5a0115 YH |
1661 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1662 | struct sk_buff *orig_skb, | |
1663 | int rd_len) | |
9c86dafe | 1664 | { |
5f5a0115 YH |
1665 | u8 *opt = skb_put(skb, rd_len); |
1666 | ||
9c86dafe YH |
1667 | memset(opt, 0, 8); |
1668 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1669 | *(opt++) = (rd_len >> 3); | |
1670 | opt += 6; | |
1671 | ||
9f62c15f LB |
1672 | skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt, |
1673 | rd_len - 8); | |
9c86dafe YH |
1674 | } |
1675 | ||
4991969a | 1676 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1677 | { |
1762f7e8 | 1678 | struct net_device *dev = skb->dev; |
c346dca1 | 1679 | struct net *net = dev_net(dev); |
1762f7e8 | 1680 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1681 | int optlen = 0; |
fbfe95a4 | 1682 | struct inet_peer *peer; |
1da177e4 | 1683 | struct sk_buff *buff; |
71bcdba0 | 1684 | struct rd_msg *msg; |
1da177e4 | 1685 | struct in6_addr saddr_buf; |
1da177e4 LT |
1686 | struct rt6_info *rt; |
1687 | struct dst_entry *dst; | |
4c9483b2 | 1688 | struct flowi6 fl6; |
1da177e4 | 1689 | int rd_len; |
f997c55c AA |
1690 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, |
1691 | ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; | |
1d861aa4 | 1692 | bool ret; |
1da177e4 | 1693 | |
2f17becf SS |
1694 | if (netif_is_l3_master(skb->dev)) { |
1695 | dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); | |
1696 | if (!dev) | |
1697 | return; | |
1698 | } | |
1699 | ||
95c385b4 | 1700 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1701 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1702 | dev->name); | |
1ab1457c YH |
1703 | return; |
1704 | } | |
1da177e4 | 1705 | |
0660e03f | 1706 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1707 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1708 | ND_PRINTK(2, warn, |
1709 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1710 | return; |
1711 | } | |
1712 | ||
4c9483b2 | 1713 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
e0d56fdd | 1714 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1715 | |
4c9483b2 | 1716 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1717 | if (dst->error) { |
1718 | dst_release(dst); | |
1da177e4 | 1719 | return; |
5095d64d | 1720 | } |
4c9483b2 | 1721 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1722 | if (IS_ERR(dst)) |
1da177e4 | 1723 | return; |
1da177e4 | 1724 | |
e8dfd42c | 1725 | rt = dst_rt6_info(dst); |
1da177e4 LT |
1726 | |
1727 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1728 | ND_PRINTK(2, warn, |
1729 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1730 | goto release; |
1da177e4 | 1731 | } |
fd0273d7 | 1732 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1733 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1734 | if (peer) | |
1735 | inet_putpeer(peer); | |
1736 | if (!ret) | |
d73f0801 | 1737 | goto release; |
1da177e4 LT |
1738 | |
1739 | if (dev->addr_len) { | |
4991969a DM |
1740 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1741 | if (!neigh) { | |
675418d5 JP |
1742 | ND_PRINTK(2, warn, |
1743 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1744 | goto release; |
1745 | } | |
1746 | ||
1da177e4 LT |
1747 | read_lock_bh(&neigh->lock); |
1748 | if (neigh->nud_state & NUD_VALID) { | |
1749 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1750 | read_unlock_bh(&neigh->lock); | |
1751 | ha = ha_buf; | |
f997c55c AA |
1752 | optlen += ndisc_redirect_opt_addr_space(dev, neigh, |
1753 | ops_data_buf, | |
1754 | &ops_data); | |
1da177e4 LT |
1755 | } else |
1756 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1757 | |
1758 | neigh_release(neigh); | |
1da177e4 LT |
1759 | } |
1760 | ||
1761 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1762 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1763 | skb->len + 8); | |
1da177e4 | 1764 | rd_len &= ~0x7; |
2ce13576 | 1765 | optlen += rd_len; |
1da177e4 | 1766 | |
2ce13576 | 1767 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1768 | if (!buff) |
d73f0801 | 1769 | goto release; |
1da177e4 | 1770 | |
4df864c1 | 1771 | msg = skb_put(buff, sizeof(*msg)); |
4d5c152e YH |
1772 | *msg = (struct rd_msg) { |
1773 | .icmph = { | |
1774 | .icmp6_type = NDISC_REDIRECT, | |
1775 | }, | |
1776 | .target = *target, | |
1777 | .dest = ipv6_hdr(skb)->daddr, | |
1778 | }; | |
1da177e4 | 1779 | |
1da177e4 LT |
1780 | /* |
1781 | * include target_address option | |
1782 | */ | |
1783 | ||
1784 | if (ha) | |
f997c55c | 1785 | ndisc_fill_redirect_addr_option(buff, ha, ops_data); |
1da177e4 LT |
1786 | |
1787 | /* | |
1788 | * build redirect option and copy skb over to the new packet. | |
1789 | */ | |
1790 | ||
9c86dafe | 1791 | if (rd_len) |
5f5a0115 | 1792 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1793 | |
adf30907 | 1794 | skb_dst_set(buff, dst); |
f4de84c6 | 1795 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1796 | return; |
1797 | ||
1798 | release: | |
1799 | dst_release(dst); | |
1da177e4 LT |
1800 | } |
1801 | ||
1802 | static void pndisc_redo(struct sk_buff *skb) | |
1803 | { | |
7c9c8913 ED |
1804 | enum skb_drop_reason reason = ndisc_recv_ns(skb); |
1805 | ||
1806 | kfree_skb_reason(skb, reason); | |
1da177e4 LT |
1807 | } |
1808 | ||
8cf8821e JD |
1809 | static int ndisc_is_multicast(const void *pkey) |
1810 | { | |
1811 | return ipv6_addr_is_multicast((struct in6_addr *)pkey); | |
1812 | } | |
1813 | ||
b800c3b9 HFS |
1814 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1815 | { | |
1816 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1817 | ||
1818 | if (!idev) | |
1819 | return true; | |
1820 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
2f0ff05a | 1821 | READ_ONCE(idev->cnf.suppress_frag_ndisc)) { |
b800c3b9 HFS |
1822 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); |
1823 | return true; | |
1824 | } | |
1825 | return false; | |
1826 | } | |
1827 | ||
545dbcd1 | 1828 | enum skb_drop_reason ndisc_rcv(struct sk_buff *skb) |
1da177e4 LT |
1829 | { |
1830 | struct nd_msg *msg; | |
545dbcd1 | 1831 | SKB_DR(reason); |
1da177e4 | 1832 | |
b800c3b9 | 1833 | if (ndisc_suppress_frag_ndisc(skb)) |
545dbcd1 | 1834 | return SKB_DROP_REASON_IPV6_NDISC_FRAG; |
b800c3b9 | 1835 | |
6bce6b4e | 1836 | if (skb_linearize(skb)) |
545dbcd1 | 1837 | return SKB_DROP_REASON_NOMEM; |
1da177e4 | 1838 | |
9c70220b | 1839 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1840 | |
9c70220b | 1841 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1842 | |
0660e03f | 1843 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1844 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1845 | ipv6_hdr(skb)->hop_limit); | |
545dbcd1 | 1846 | return SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT; |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1850 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1851 | msg->icmph.icmp6_code); | |
545dbcd1 | 1852 | return SKB_DROP_REASON_IPV6_NDISC_BAD_CODE; |
1da177e4 LT |
1853 | } |
1854 | ||
1855 | switch (msg->icmph.icmp6_type) { | |
1856 | case NDISC_NEIGHBOUR_SOLICITATION: | |
ee1abcf6 | 1857 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
7c9c8913 | 1858 | reason = ndisc_recv_ns(skb); |
1da177e4 LT |
1859 | break; |
1860 | ||
1861 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
3009f9ae | 1862 | reason = ndisc_recv_na(skb); |
1da177e4 LT |
1863 | break; |
1864 | ||
1865 | case NDISC_ROUTER_SOLICITATION: | |
243e37c6 | 1866 | reason = ndisc_recv_rs(skb); |
1da177e4 LT |
1867 | break; |
1868 | ||
1869 | case NDISC_ROUTER_ADVERTISEMENT: | |
2f326d9d | 1870 | reason = ndisc_router_discovery(skb); |
1da177e4 LT |
1871 | break; |
1872 | ||
1873 | case NDISC_REDIRECT: | |
ec993edf | 1874 | reason = ndisc_redirect_rcv(skb); |
1da177e4 | 1875 | break; |
3ff50b79 | 1876 | } |
1da177e4 | 1877 | |
545dbcd1 | 1878 | return reason; |
1da177e4 LT |
1879 | } |
1880 | ||
1881 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1882 | { | |
351638e7 | 1883 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1884 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1885 | struct net *net = dev_net(dev); |
5cb04436 | 1886 | struct inet6_dev *idev; |
18ac597a | 1887 | bool evict_nocarrier; |
1da177e4 LT |
1888 | |
1889 | switch (event) { | |
1890 | case NETDEV_CHANGEADDR: | |
1891 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1892 | fib6_run_gc(0, net, false); |
a8eceea8 | 1893 | fallthrough; |
4a6e3c5d | 1894 | case NETDEV_UP: |
5cb04436 HFS |
1895 | idev = in6_dev_get(dev); |
1896 | if (!idev) | |
1897 | break; | |
2f0ff05a ED |
1898 | if (READ_ONCE(idev->cnf.ndisc_notify) || |
1899 | READ_ONCE(net->ipv6.devconf_all->ndisc_notify)) | |
5cb04436 HFS |
1900 | ndisc_send_unsol_na(dev); |
1901 | in6_dev_put(idev); | |
1da177e4 | 1902 | break; |
c8507fb2 | 1903 | case NETDEV_CHANGE: |
18ac597a JP |
1904 | idev = in6_dev_get(dev); |
1905 | if (!idev) | |
1906 | evict_nocarrier = true; | |
1907 | else { | |
2f0ff05a ED |
1908 | evict_nocarrier = READ_ONCE(idev->cnf.ndisc_evict_nocarrier) && |
1909 | READ_ONCE(net->ipv6.devconf_all->ndisc_evict_nocarrier); | |
18ac597a JP |
1910 | in6_dev_put(idev); |
1911 | } | |
1912 | ||
c8507fb2 ED |
1913 | change_info = ptr; |
1914 | if (change_info->flags_changed & IFF_NOARP) | |
1915 | neigh_changeaddr(&nd_tbl, dev); | |
18ac597a | 1916 | if (evict_nocarrier && !netif_carrier_ok(dev)) |
859bd2ef | 1917 | neigh_carrier_down(&nd_tbl, dev); |
c8507fb2 | 1918 | break; |
1da177e4 LT |
1919 | case NETDEV_DOWN: |
1920 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1921 | fib6_run_gc(0, net, false); |
1da177e4 | 1922 | break; |
f47b9464 BH |
1923 | case NETDEV_NOTIFY_PEERS: |
1924 | ndisc_send_unsol_na(dev); | |
1925 | break; | |
1da177e4 LT |
1926 | default: |
1927 | break; | |
1928 | } | |
1929 | ||
1930 | return NOTIFY_DONE; | |
1931 | } | |
1932 | ||
1933 | static struct notifier_block ndisc_netdev_notifier = { | |
1934 | .notifier_call = ndisc_netdev_event, | |
6eb79393 | 1935 | .priority = ADDRCONF_NOTIFY_PRIORITY - 5, |
1da177e4 LT |
1936 | }; |
1937 | ||
1938 | #ifdef CONFIG_SYSCTL | |
1939 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1940 | const char *func, const char *dev_name) | |
1941 | { | |
1942 | static char warncomm[TASK_COMM_LEN]; | |
1943 | static int warned; | |
1944 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1945 | strcpy(warncomm, current->comm); | |
f3213831 | 1946 | 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 |
1947 | warncomm, func, |
1948 | dev_name, ctl->procname, | |
1949 | dev_name, ctl->procname); | |
1950 | warned++; | |
1951 | } | |
1952 | } | |
1953 | ||
32927393 CH |
1954 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void *buffer, |
1955 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1956 | { |
1957 | struct net_device *dev = ctl->extra1; | |
1958 | struct inet6_dev *idev; | |
1959 | int ret; | |
1960 | ||
d12af679 EB |
1961 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1962 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1963 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1964 | ||
d12af679 | 1965 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1966 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1967 | |
1968 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1969 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1970 | buffer, lenp, ppos); | |
d12af679 EB |
1971 | |
1972 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1973 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1974 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1975 | buffer, lenp, ppos); | |
d12af679 | 1976 | else |
1da177e4 | 1977 | ret = -1; |
1da177e4 LT |
1978 | |
1979 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1980 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1981 | idev->nd_parms->reachable_time = | |
1982 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
4ad26813 | 1983 | WRITE_ONCE(idev->tstamp, jiffies); |
1da177e4 LT |
1984 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
1985 | in6_dev_put(idev); | |
1986 | } | |
1987 | return ret; | |
1988 | } | |
1989 | ||
1da177e4 LT |
1990 | |
1991 | #endif | |
1992 | ||
2c8c1e72 | 1993 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1994 | { |
1995 | struct ipv6_pinfo *np; | |
1996 | struct sock *sk; | |
1ab1457c | 1997 | int err; |
1da177e4 | 1998 | |
1ed8516f DL |
1999 | err = inet_ctl_sock_create(&sk, PF_INET6, |
2000 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 2001 | if (err < 0) { |
675418d5 JP |
2002 | ND_PRINTK(0, err, |
2003 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
2004 | err); | |
1da177e4 LT |
2005 | return err; |
2006 | } | |
2007 | ||
1ed8516f | 2008 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 2009 | |
1da177e4 | 2010 | np = inet6_sk(sk); |
1da177e4 LT |
2011 | np->hop_limit = 255; |
2012 | /* Do not loopback ndisc messages */ | |
d986f521 | 2013 | inet6_clear_bit(MC6_LOOP, sk); |
1da177e4 | 2014 | |
1762f7e8 DL |
2015 | return 0; |
2016 | } | |
2017 | ||
2c8c1e72 | 2018 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 2019 | { |
1ed8516f | 2020 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
2021 | } |
2022 | ||
2023 | static struct pernet_operations ndisc_net_ops = { | |
2024 | .init = ndisc_net_init, | |
2025 | .exit = ndisc_net_exit, | |
2026 | }; | |
2027 | ||
2028 | int __init ndisc_init(void) | |
2029 | { | |
2030 | int err; | |
2031 | ||
2032 | err = register_pernet_subsys(&ndisc_net_ops); | |
2033 | if (err) | |
2034 | return err; | |
1ab1457c YH |
2035 | /* |
2036 | * Initialize the neighbour table | |
2037 | */ | |
d7480fd3 | 2038 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
2039 | |
2040 | #ifdef CONFIG_SYSCTL | |
73af614a | 2041 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 2042 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
2043 | if (err) |
2044 | goto out_unregister_pernet; | |
1762f7e8 | 2045 | out: |
bcd081a3 | 2046 | #endif |
1762f7e8 | 2047 | return err; |
1da177e4 | 2048 | |
1762f7e8 | 2049 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 2050 | out_unregister_pernet: |
1762f7e8 DL |
2051 | unregister_pernet_subsys(&ndisc_net_ops); |
2052 | goto out; | |
2c861cc6 | 2053 | #endif |
1da177e4 LT |
2054 | } |
2055 | ||
2c861cc6 MK |
2056 | int __init ndisc_late_init(void) |
2057 | { | |
2058 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
2059 | } | |
2060 | ||
2061 | void ndisc_late_cleanup(void) | |
1da177e4 | 2062 | { |
36f73d0c | 2063 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
2064 | } |
2065 | ||
2066 | void ndisc_cleanup(void) | |
2067 | { | |
1da177e4 LT |
2068 | #ifdef CONFIG_SYSCTL |
2069 | neigh_sysctl_unregister(&nd_tbl.parms); | |
2070 | #endif | |
d7480fd3 | 2071 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 2072 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 2073 | } |