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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _NDISC_H |
3 | #define _NDISC_H | |
4 | ||
5 | /* | |
6 | * ICMP codes for neighbour discovery messages | |
7 | */ | |
8 | ||
9 | #define NDISC_ROUTER_SOLICITATION 133 | |
10 | #define NDISC_ROUTER_ADVERTISEMENT 134 | |
11 | #define NDISC_NEIGHBOUR_SOLICITATION 135 | |
12 | #define NDISC_NEIGHBOUR_ADVERTISEMENT 136 | |
13 | #define NDISC_REDIRECT 137 | |
14 | ||
fadf6bf0 TF |
15 | /* |
16 | * Router type: cross-layer information from link-layer to | |
17 | * IPv6 layer reported by certain link types (e.g., RFC4214). | |
18 | */ | |
19 | #define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */ | |
20 | #define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */ | |
21 | #define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */ | |
22 | #define NDISC_NODETYPE_DEFAULT 3 /* default router */ | |
23 | ||
1da177e4 LT |
24 | /* |
25 | * ndisc options | |
26 | */ | |
27 | ||
28 | enum { | |
29 | __ND_OPT_PREFIX_INFO_END = 0, | |
30 | ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */ | |
31 | ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */ | |
32 | ND_OPT_PREFIX_INFO = 3, /* RFC2461 */ | |
33 | ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */ | |
34 | ND_OPT_MTU = 5, /* RFC2461 */ | |
adc176c5 | 35 | ND_OPT_NONCE = 14, /* RFC7527 */ |
70ceb4f5 YH |
36 | __ND_OPT_ARRAY_MAX, |
37 | ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ | |
31910575 | 38 | ND_OPT_RDNSS = 25, /* RFC5006 */ |
e35f30c1 | 39 | ND_OPT_DNSSL = 31, /* RFC6106 */ |
bbe5f5ce | 40 | ND_OPT_6CO = 34, /* RFC6775 */ |
1da177e4 LT |
41 | __ND_OPT_MAX |
42 | }; | |
43 | ||
44 | #define MAX_RTR_SOLICITATION_DELAY HZ | |
45 | ||
46 | #define ND_REACHABLE_TIME (30*HZ) | |
47 | #define ND_RETRANS_TIMER HZ | |
48 | ||
14c85021 | 49 | #include <linux/compiler.h> |
1da177e4 | 50 | #include <linux/icmpv6.h> |
14c85021 ACM |
51 | #include <linux/in6.h> |
52 | #include <linux/types.h> | |
30f2a5f3 DM |
53 | #include <linux/if_arp.h> |
54 | #include <linux/netdevice.h> | |
b14f243a | 55 | #include <linux/hash.h> |
14c85021 | 56 | |
1da177e4 | 57 | #include <net/neighbour.h> |
14c85021 | 58 | |
cc84b3c6 AA |
59 | /* Set to 3 to get tracing... */ |
60 | #define ND_DEBUG 1 | |
61 | ||
62 | #define ND_PRINTK(val, level, fmt, ...) \ | |
63 | do { \ | |
64 | if (val <= ND_DEBUG) \ | |
65 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
66 | } while (0) | |
67 | ||
14c85021 | 68 | struct ctl_table; |
14c85021 ACM |
69 | struct inet6_dev; |
70 | struct net_device; | |
71 | struct net_proto_family; | |
72 | struct sk_buff; | |
f997c55c | 73 | struct prefix_info; |
1da177e4 LT |
74 | |
75 | extern struct neigh_table nd_tbl; | |
76 | ||
77 | struct nd_msg { | |
78 | struct icmp6hdr icmph; | |
79 | struct in6_addr target; | |
80 | __u8 opt[0]; | |
81 | }; | |
82 | ||
83 | struct rs_msg { | |
84 | struct icmp6hdr icmph; | |
85 | __u8 opt[0]; | |
86 | }; | |
87 | ||
88 | struct ra_msg { | |
89 | struct icmp6hdr icmph; | |
e69a4adc AV |
90 | __be32 reachable_time; |
91 | __be32 retrans_timer; | |
1da177e4 LT |
92 | }; |
93 | ||
093d04d4 DJ |
94 | struct rd_msg { |
95 | struct icmp6hdr icmph; | |
96 | struct in6_addr target; | |
97 | struct in6_addr dest; | |
98 | __u8 opt[0]; | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | struct nd_opt_hdr { |
102 | __u8 nd_opt_type; | |
103 | __u8 nd_opt_len; | |
bc10502d | 104 | } __packed; |
1da177e4 | 105 | |
30f2a5f3 DM |
106 | /* ND options */ |
107 | struct ndisc_options { | |
108 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; | |
109 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
110 | struct nd_opt_hdr *nd_opts_ri; | |
111 | struct nd_opt_hdr *nd_opts_ri_end; | |
112 | #endif | |
113 | struct nd_opt_hdr *nd_useropts; | |
114 | struct nd_opt_hdr *nd_useropts_end; | |
bbe5f5ce AA |
115 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
116 | struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1]; | |
117 | #endif | |
30f2a5f3 DM |
118 | }; |
119 | ||
bbe5f5ce AA |
120 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] |
121 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
122 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
123 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
124 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
125 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
adc176c5 | 126 | #define nd_opts_nonce nd_opt_array[ND_OPT_NONCE] |
bbe5f5ce AA |
127 | #define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR] |
128 | #define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR] | |
30f2a5f3 DM |
129 | |
130 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
131 | ||
f997c55c AA |
132 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
133 | u8 *opt, int opt_len, | |
3cc818a2 | 134 | struct ndisc_options *ndopts); |
30f2a5f3 | 135 | |
cc84b3c6 AA |
136 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, |
137 | int data_len, int pad); | |
138 | ||
f997c55c AA |
139 | #define NDISC_OPS_REDIRECT_DATA_SPACE 2 |
140 | ||
141 | /* | |
142 | * This structure defines the hooks for IPv6 neighbour discovery. | |
143 | * The following hooks can be defined; unless noted otherwise, they are | |
144 | * optional and can be filled with a null pointer. | |
145 | * | |
146 | * int (*is_useropt)(u8 nd_opt_type): | |
147 | * This function is called when IPv6 decide RA userspace options. if | |
148 | * this function returns 1 then the option given by nd_opt_type will | |
149 | * be handled as userspace option additional to the IPv6 options. | |
150 | * | |
151 | * int (*parse_options)(const struct net_device *dev, | |
152 | * struct nd_opt_hdr *nd_opt, | |
153 | * struct ndisc_options *ndopts): | |
154 | * This function is called while parsing ndisc ops and put each position | |
155 | * as pointer into ndopts. If this function return unequal 0, then this | |
156 | * function took care about the ndisc option, if 0 then the IPv6 ndisc | |
157 | * option parser will take care about that option. | |
158 | * | |
159 | * void (*update)(const struct net_device *dev, struct neighbour *n, | |
160 | * u32 flags, u8 icmp6_type, | |
161 | * const struct ndisc_options *ndopts): | |
162 | * This function is called when IPv6 ndisc updates the neighbour cache | |
163 | * entry. Additional options which can be updated may be previously | |
164 | * parsed by parse_opts callback and accessible over ndopts parameter. | |
165 | * | |
166 | * int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type, | |
167 | * struct neighbour *neigh, u8 *ha_buf, | |
168 | * u8 **ha): | |
169 | * This function is called when the necessary option space will be | |
170 | * calculated before allocating a skb. The parameters neigh, ha_buf | |
171 | * abd ha are available on NDISC_REDIRECT messages only. | |
172 | * | |
173 | * void (*fill_addr_option)(const struct net_device *dev, | |
174 | * struct sk_buff *skb, u8 icmp6_type, | |
175 | * const u8 *ha): | |
176 | * This function is called when the skb will finally fill the option | |
177 | * fields inside skb. NOTE: this callback should fill the option | |
178 | * fields to the skb which are previously indicated by opt_space | |
179 | * parameter. That means the decision to add such option should | |
180 | * not lost between these two callbacks, e.g. protected by interface | |
181 | * up state. | |
182 | * | |
183 | * void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev, | |
184 | * const struct prefix_info *pinfo, | |
185 | * struct inet6_dev *in6_dev, | |
186 | * struct in6_addr *addr, | |
187 | * int addr_type, u32 addr_flags, | |
188 | * bool sllao, bool tokenized, | |
189 | * __u32 valid_lft, u32 prefered_lft, | |
190 | * bool dev_addr_generated): | |
191 | * This function is called when a RA messages is received with valid | |
192 | * PIO option fields and an IPv6 address will be added to the interface | |
193 | * for autoconfiguration. The parameter dev_addr_generated reports about | |
194 | * if the address was based on dev->dev_addr or not. This can be used | |
195 | * to add a second address if link-layer operates with two link layer | |
196 | * addresses. E.g. 802.15.4 6LoWPAN. | |
197 | */ | |
198 | struct ndisc_ops { | |
199 | int (*is_useropt)(u8 nd_opt_type); | |
200 | int (*parse_options)(const struct net_device *dev, | |
201 | struct nd_opt_hdr *nd_opt, | |
202 | struct ndisc_options *ndopts); | |
203 | void (*update)(const struct net_device *dev, struct neighbour *n, | |
204 | u32 flags, u8 icmp6_type, | |
205 | const struct ndisc_options *ndopts); | |
206 | int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type, | |
207 | struct neighbour *neigh, u8 *ha_buf, | |
208 | u8 **ha); | |
209 | void (*fill_addr_option)(const struct net_device *dev, | |
210 | struct sk_buff *skb, u8 icmp6_type, | |
211 | const u8 *ha); | |
212 | void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev, | |
213 | const struct prefix_info *pinfo, | |
214 | struct inet6_dev *in6_dev, | |
215 | struct in6_addr *addr, | |
216 | int addr_type, u32 addr_flags, | |
217 | bool sllao, bool tokenized, | |
218 | __u32 valid_lft, u32 prefered_lft, | |
219 | bool dev_addr_generated); | |
220 | }; | |
221 | ||
222 | #if IS_ENABLED(CONFIG_IPV6) | |
223 | static inline int ndisc_ops_is_useropt(const struct net_device *dev, | |
224 | u8 nd_opt_type) | |
225 | { | |
226 | if (dev->ndisc_ops && dev->ndisc_ops->is_useropt) | |
227 | return dev->ndisc_ops->is_useropt(nd_opt_type); | |
228 | else | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static inline int ndisc_ops_parse_options(const struct net_device *dev, | |
233 | struct nd_opt_hdr *nd_opt, | |
234 | struct ndisc_options *ndopts) | |
235 | { | |
236 | if (dev->ndisc_ops && dev->ndisc_ops->parse_options) | |
237 | return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts); | |
238 | else | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static inline void ndisc_ops_update(const struct net_device *dev, | |
243 | struct neighbour *n, u32 flags, | |
244 | u8 icmp6_type, | |
245 | const struct ndisc_options *ndopts) | |
246 | { | |
247 | if (dev->ndisc_ops && dev->ndisc_ops->update) | |
248 | dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts); | |
249 | } | |
250 | ||
251 | static inline int ndisc_ops_opt_addr_space(const struct net_device *dev, | |
252 | u8 icmp6_type) | |
253 | { | |
254 | if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space && | |
255 | icmp6_type != NDISC_REDIRECT) | |
256 | return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL, | |
257 | NULL, NULL); | |
258 | else | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev, | |
263 | struct neighbour *neigh, | |
264 | u8 *ha_buf, u8 **ha) | |
265 | { | |
266 | if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space) | |
267 | return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT, | |
268 | neigh, ha_buf, ha); | |
269 | else | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static inline void ndisc_ops_fill_addr_option(const struct net_device *dev, | |
274 | struct sk_buff *skb, | |
275 | u8 icmp6_type) | |
276 | { | |
277 | if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option && | |
278 | icmp6_type != NDISC_REDIRECT) | |
279 | dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL); | |
280 | } | |
281 | ||
282 | static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev, | |
283 | struct sk_buff *skb, | |
284 | const u8 *ha) | |
285 | { | |
286 | if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option) | |
287 | dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha); | |
288 | } | |
289 | ||
290 | static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net, | |
291 | struct net_device *dev, | |
292 | const struct prefix_info *pinfo, | |
293 | struct inet6_dev *in6_dev, | |
294 | struct in6_addr *addr, | |
295 | int addr_type, u32 addr_flags, | |
296 | bool sllao, bool tokenized, | |
297 | __u32 valid_lft, | |
298 | u32 prefered_lft, | |
299 | bool dev_addr_generated) | |
300 | { | |
301 | if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr) | |
302 | dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev, | |
303 | addr, addr_type, | |
304 | addr_flags, sllao, | |
305 | tokenized, valid_lft, | |
306 | prefered_lft, | |
307 | dev_addr_generated); | |
308 | } | |
309 | #endif | |
310 | ||
30f2a5f3 DM |
311 | /* |
312 | * Return the padding between the option length and the start of the | |
313 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
314 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
315 | * also need a pad of 2. | |
316 | */ | |
d9d10a30 | 317 | static inline int ndisc_addr_option_pad(unsigned short type) |
30f2a5f3 DM |
318 | { |
319 | switch (type) { | |
320 | case ARPHRD_INFINIBAND: return 2; | |
321 | default: return 0; | |
322 | } | |
323 | } | |
324 | ||
1e82f961 AA |
325 | static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad) |
326 | { | |
327 | return NDISC_OPT_SPACE(addr_len + pad); | |
328 | } | |
329 | ||
f997c55c AA |
330 | #if IS_ENABLED(CONFIG_IPV6) |
331 | static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type) | |
332 | { | |
333 | return __ndisc_opt_addr_space(dev->addr_len, | |
334 | ndisc_addr_option_pad(dev->type)) + | |
335 | ndisc_ops_opt_addr_space(dev, icmp6_type); | |
336 | } | |
337 | ||
338 | static inline int ndisc_redirect_opt_addr_space(struct net_device *dev, | |
339 | struct neighbour *neigh, | |
340 | u8 *ops_data_buf, | |
341 | u8 **ops_data) | |
c558e9fc | 342 | { |
1e82f961 | 343 | return __ndisc_opt_addr_space(dev->addr_len, |
f997c55c AA |
344 | ndisc_addr_option_pad(dev->type)) + |
345 | ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf, | |
346 | ops_data); | |
c558e9fc | 347 | } |
f997c55c | 348 | #endif |
c558e9fc | 349 | |
4f36ce84 AA |
350 | static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p, |
351 | unsigned char addr_len, int prepad) | |
30f2a5f3 DM |
352 | { |
353 | u8 *lladdr = (u8 *)(p + 1); | |
354 | int lladdrlen = p->nd_opt_len << 3; | |
4f36ce84 | 355 | if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad)) |
30f2a5f3 DM |
356 | return NULL; |
357 | return lladdr + prepad; | |
358 | } | |
359 | ||
4f36ce84 AA |
360 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, |
361 | struct net_device *dev) | |
362 | { | |
363 | return __ndisc_opt_addr_data(p, dev->addr_len, | |
364 | ndisc_addr_option_pad(dev->type)); | |
365 | } | |
366 | ||
2c2aba6c DM |
367 | static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) |
368 | { | |
369 | const u32 *p32 = pkey; | |
370 | ||
b14f243a | 371 | return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + |
2c2aba6c DM |
372 | (p32[1] * hash_rnd[1]) + |
373 | (p32[2] * hash_rnd[2]) + | |
374 | (p32[3] * hash_rnd[3])); | |
375 | } | |
1da177e4 | 376 | |
ac3175fe | 377 | static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey) |
f83c7790 | 378 | { |
60395a20 | 379 | return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev); |
ac3175fe YH |
380 | } |
381 | ||
382 | static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey) | |
383 | { | |
384 | struct neighbour *n; | |
385 | ||
386 | rcu_read_lock_bh(); | |
387 | n = __ipv6_neigh_lookup_noref(dev, pkey); | |
9f237430 | 388 | if (n && !refcount_inc_not_zero(&n->refcnt)) |
ac3175fe | 389 | n = NULL; |
f83c7790 DM |
390 | rcu_read_unlock_bh(); |
391 | ||
392 | return n; | |
393 | } | |
394 | ||
63fca65d JA |
395 | static inline void __ipv6_confirm_neigh(struct net_device *dev, |
396 | const void *pkey) | |
397 | { | |
398 | struct neighbour *n; | |
399 | ||
400 | rcu_read_lock_bh(); | |
401 | n = __ipv6_neigh_lookup_noref(dev, pkey); | |
402 | if (n) { | |
403 | unsigned long now = jiffies; | |
404 | ||
405 | /* avoid dirtying neighbour */ | |
406 | if (n->confirmed != now) | |
407 | n->confirmed = now; | |
408 | } | |
409 | rcu_read_unlock_bh(); | |
410 | } | |
411 | ||
3cc818a2 JP |
412 | int ndisc_init(void); |
413 | int ndisc_late_init(void); | |
1da177e4 | 414 | |
3cc818a2 JP |
415 | void ndisc_late_cleanup(void); |
416 | void ndisc_cleanup(void); | |
1da177e4 | 417 | |
3cc818a2 | 418 | int ndisc_rcv(struct sk_buff *skb); |
1da177e4 | 419 | |
38cf595b | 420 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
adc176c5 EN |
421 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
422 | u64 nonce); | |
1da177e4 | 423 | |
3cc818a2 JP |
424 | void ndisc_send_rs(struct net_device *dev, |
425 | const struct in6_addr *saddr, const struct in6_addr *daddr); | |
38cf595b | 426 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
3cc818a2 JP |
427 | const struct in6_addr *solicited_addr, |
428 | bool router, bool solicited, bool override, bool inc_opt); | |
1da177e4 | 429 | |
3cc818a2 | 430 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target); |
1da177e4 | 431 | |
3cc818a2 JP |
432 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, |
433 | int dir); | |
1da177e4 | 434 | |
f997c55c AA |
435 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
436 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
437 | struct ndisc_options *ndopts); | |
1da177e4 LT |
438 | |
439 | /* | |
440 | * IGMP | |
441 | */ | |
3cc818a2 | 442 | int igmp6_init(void); |
382ed724 | 443 | int igmp6_late_init(void); |
1da177e4 | 444 | |
3cc818a2 | 445 | void igmp6_cleanup(void); |
382ed724 | 446 | void igmp6_late_cleanup(void); |
1da177e4 | 447 | |
3cc818a2 | 448 | int igmp6_event_query(struct sk_buff *skb); |
1da177e4 | 449 | |
3cc818a2 | 450 | int igmp6_event_report(struct sk_buff *skb); |
1da177e4 | 451 | |
1da177e4 LT |
452 | |
453 | #ifdef CONFIG_SYSCTL | |
3cc818a2 JP |
454 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, |
455 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
fedaf4ff | 456 | int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl, |
f221e726 | 457 | void __user *oldval, size_t __user *oldlenp, |
0686caa3 | 458 | void __user *newval, size_t newlen); |
1da177e4 LT |
459 | #endif |
460 | ||
3cc818a2 | 461 | void inet6_ifinfo_notify(int event, struct inet6_dev *idev); |
1da177e4 | 462 | |
1da177e4 | 463 | #endif |