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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for the Forwarding Information Base. | |
7 | * | |
8 | * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #ifndef _NET_IP_FIB_H | |
17 | #define _NET_IP_FIB_H | |
18 | ||
1da177e4 LT |
19 | #include <net/flow.h> |
20 | #include <linux/seq_file.h> | |
4895c771 | 21 | #include <linux/rcupdate.h> |
04b1d4e5 | 22 | #include <net/fib_notifier.h> |
e1ef4bf2 | 23 | #include <net/fib_rules.h> |
8e773277 | 24 | #include <net/inetpeer.h> |
d26b3a7c | 25 | #include <linux/percpu.h> |
b90eb754 | 26 | #include <linux/notifier.h> |
0029c0de | 27 | #include <linux/refcount.h> |
1da177e4 | 28 | |
4e902c57 | 29 | struct fib_config { |
4e902c57 | 30 | u8 fc_dst_len; |
4e902c57 TG |
31 | u8 fc_tos; |
32 | u8 fc_protocol; | |
33 | u8 fc_scope; | |
34 | u8 fc_type; | |
b52f070c | 35 | /* 3 bytes unused */ |
4e902c57 | 36 | u32 fc_table; |
6d85c10a | 37 | __be32 fc_dst; |
6d85c10a | 38 | __be32 fc_gw; |
4e902c57 TG |
39 | int fc_oif; |
40 | u32 fc_flags; | |
41 | u32 fc_priority; | |
6d85c10a | 42 | __be32 fc_prefsrc; |
4e902c57 TG |
43 | struct nlattr *fc_mx; |
44 | struct rtnexthop *fc_mp; | |
45 | int fc_mx_len; | |
46 | int fc_mp_len; | |
47 | u32 fc_flow; | |
4e902c57 TG |
48 | u32 fc_nlflags; |
49 | struct nl_info fc_nlinfo; | |
571e7226 RP |
50 | struct nlattr *fc_encap; |
51 | u16 fc_encap_type; | |
52 | }; | |
1da177e4 LT |
53 | |
54 | struct fib_info; | |
f2bb4bed | 55 | struct rtable; |
1da177e4 | 56 | |
4895c771 DM |
57 | struct fib_nh_exception { |
58 | struct fib_nh_exception __rcu *fnhe_next; | |
5aad1de5 | 59 | int fnhe_genid; |
4895c771 DM |
60 | __be32 fnhe_daddr; |
61 | u32 fnhe_pmtu; | |
a9f829f7 | 62 | bool fnhe_mtu_locked; |
aee06da6 | 63 | __be32 fnhe_gw; |
4895c771 | 64 | unsigned long fnhe_expires; |
2ffae99d TT |
65 | struct rtable __rcu *fnhe_rth_input; |
66 | struct rtable __rcu *fnhe_rth_output; | |
4895c771 | 67 | unsigned long fnhe_stamp; |
deed49df | 68 | struct rcu_head rcu; |
4895c771 DM |
69 | }; |
70 | ||
71 | struct fnhe_hash_bucket { | |
72 | struct fib_nh_exception __rcu *chain; | |
73 | }; | |
74 | ||
d546c621 ED |
75 | #define FNHE_HASH_SHIFT 11 |
76 | #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) | |
4895c771 DM |
77 | #define FNHE_RECLAIM_DEPTH 5 |
78 | ||
1da177e4 LT |
79 | struct fib_nh { |
80 | struct net_device *nh_dev; | |
81 | struct hlist_node nh_hash; | |
82 | struct fib_info *nh_parent; | |
95c96174 | 83 | unsigned int nh_flags; |
1da177e4 LT |
84 | unsigned char nh_scope; |
85 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
86 | int nh_weight; | |
0e884c78 | 87 | atomic_t nh_upper_bound; |
1da177e4 | 88 | #endif |
c7066f70 | 89 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
90 | __u32 nh_tclassid; |
91 | #endif | |
92 | int nh_oif; | |
ed49e3ca | 93 | __be32 nh_gw; |
1fc050a1 | 94 | __be32 nh_saddr; |
436c3b66 | 95 | int nh_saddr_genid; |
d26b3a7c | 96 | struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
54764bb6 | 97 | struct rtable __rcu *nh_rth_input; |
caa41527 | 98 | struct fnhe_hash_bucket __rcu *nh_exceptions; |
571e7226 | 99 | struct lwtunnel_state *nh_lwtstate; |
1da177e4 LT |
100 | }; |
101 | ||
102 | /* | |
103 | * This structure contains data shared by many of routes. | |
104 | */ | |
105 | ||
106 | struct fib_info { | |
107 | struct hlist_node fib_hash; | |
108 | struct hlist_node fib_lhash; | |
7462bd74 | 109 | struct net *fib_net; |
1da177e4 | 110 | int fib_treeref; |
0029c0de | 111 | refcount_t fib_clntref; |
95c96174 | 112 | unsigned int fib_flags; |
37e826c5 DM |
113 | unsigned char fib_dead; |
114 | unsigned char fib_protocol; | |
115 | unsigned char fib_scope; | |
f4ef85bb | 116 | unsigned char fib_type; |
b83738ae | 117 | __be32 fib_prefsrc; |
5a56a0b3 | 118 | u32 fib_tb_id; |
1da177e4 | 119 | u32 fib_priority; |
3fb07daf ED |
120 | struct dst_metrics *fib_metrics; |
121 | #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] | |
122 | #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] | |
123 | #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] | |
124 | #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] | |
1da177e4 | 125 | int fib_nhs; |
ebc0ffae | 126 | struct rcu_head rcu; |
1da177e4 LT |
127 | struct fib_nh fib_nh[0]; |
128 | #define fib_dev fib_nh[0].nh_dev | |
129 | }; | |
130 | ||
131 | ||
132 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
133 | struct fib_rule; | |
134 | #endif | |
135 | ||
5b470441 | 136 | struct fib_table; |
1da177e4 | 137 | struct fib_result { |
6ffd9034 | 138 | __be32 prefix; |
1da177e4 LT |
139 | unsigned char prefixlen; |
140 | unsigned char nh_sel; | |
141 | unsigned char type; | |
142 | unsigned char scope; | |
85b91b03 | 143 | u32 tclassid; |
1da177e4 | 144 | struct fib_info *fi; |
5b470441 | 145 | struct fib_table *table; |
56315f9e | 146 | struct hlist_head *fa_head; |
1da177e4 LT |
147 | }; |
148 | ||
246955fe | 149 | struct fib_result_nl { |
80e856e1 | 150 | __be32 fl_addr; /* To be looked up*/ |
5f300893 | 151 | u32 fl_mark; |
246955fe RO |
152 | unsigned char fl_tos; |
153 | unsigned char fl_scope; | |
154 | unsigned char tb_id_in; | |
155 | ||
156 | unsigned char tb_id; /* Results */ | |
157 | unsigned char prefixlen; | |
158 | unsigned char nh_sel; | |
159 | unsigned char type; | |
160 | unsigned char scope; | |
161 | int err; | |
162 | }; | |
1da177e4 LT |
163 | |
164 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 165 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
1da177e4 | 166 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 167 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
5b9e12db | 168 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 169 | |
5b9e12db | 170 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
93456b6d | 171 | #define FIB_TABLE_HASHSZ 256 |
5b9e12db DL |
172 | #else |
173 | #define FIB_TABLE_HASHSZ 2 | |
174 | #endif | |
1da177e4 | 175 | |
5c3a0fd7 | 176 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
436c3b66 DM |
177 | |
178 | #define FIB_RES_SADDR(net, res) \ | |
179 | ((FIB_RES_NH(res).nh_saddr_genid == \ | |
180 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ | |
181 | FIB_RES_NH(res).nh_saddr : \ | |
182 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) | |
1da177e4 LT |
183 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
184 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
185 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
186 | ||
436c3b66 DM |
187 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
188 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 189 | |
b90eb754 JP |
190 | struct fib_entry_notifier_info { |
191 | struct fib_notifier_info info; /* must be first */ | |
192 | u32 dst; | |
193 | int dst_len; | |
194 | struct fib_info *fi; | |
195 | u8 tos; | |
196 | u8 type; | |
197 | u32 tb_id; | |
b90eb754 JP |
198 | }; |
199 | ||
982acb97 IS |
200 | struct fib_nh_notifier_info { |
201 | struct fib_notifier_info info; /* must be first */ | |
202 | struct fib_nh *fib_nh; | |
203 | }; | |
204 | ||
04b1d4e5 IS |
205 | int call_fib4_notifier(struct notifier_block *nb, struct net *net, |
206 | enum fib_event_type event_type, | |
b90eb754 | 207 | struct fib_notifier_info *info); |
04b1d4e5 IS |
208 | int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, |
209 | struct fib_notifier_info *info); | |
210 | ||
211 | int __net_init fib4_notifier_init(struct net *net); | |
212 | void __net_exit fib4_notifier_exit(struct net *net); | |
b90eb754 | 213 | |
d05f7a7d | 214 | void fib_notify(struct net *net, struct notifier_block *nb); |
c0243892 | 215 | |
1da177e4 | 216 | struct fib_table { |
8e773277 DM |
217 | struct hlist_node tb_hlist; |
218 | u32 tb_id; | |
8e773277 | 219 | int tb_num_default; |
a7e53531 | 220 | struct rcu_head rcu; |
0ddcf43d AD |
221 | unsigned long *tb_data; |
222 | unsigned long __data[0]; | |
1da177e4 LT |
223 | }; |
224 | ||
5c3a0fd7 JP |
225 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
226 | struct fib_result *res, int fib_flags); | |
6d8422a1 DA |
227 | int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, |
228 | struct netlink_ext_ack *extack); | |
78055998 DA |
229 | int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, |
230 | struct netlink_ext_ack *extack); | |
5c3a0fd7 JP |
231 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
232 | struct netlink_callback *cb); | |
b90eb754 | 233 | int fib_table_flush(struct net *net, struct fib_table *table); |
0ddcf43d | 234 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
3b709334 | 235 | void fib_table_flush_external(struct fib_table *table); |
5c3a0fd7 | 236 | void fib_free_table(struct fib_table *tb); |
4aa2c466 | 237 | |
1da177e4 LT |
238 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
239 | ||
a5a519b2 AD |
240 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
241 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) | |
1da177e4 | 242 | |
8ad4942c | 243 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 244 | { |
a7e53531 | 245 | struct hlist_node *tb_hlist; |
93456b6d DL |
246 | struct hlist_head *ptr; |
247 | ||
248 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
249 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
250 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
a7e53531 AD |
251 | |
252 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); | |
253 | ||
254 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); | |
1da177e4 LT |
255 | } |
256 | ||
8ad4942c | 257 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 258 | { |
8ad4942c | 259 | return fib_get_table(net, id); |
1da177e4 LT |
260 | } |
261 | ||
22bd5b9b | 262 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
0eeb075f | 263 | struct fib_result *res, unsigned int flags) |
1da177e4 | 264 | { |
a7e53531 | 265 | struct fib_table *tb; |
0ddcf43d | 266 | int err = -ENETUNREACH; |
345e9b54 AD |
267 | |
268 | rcu_read_lock(); | |
269 | ||
0ddcf43d | 270 | tb = fib_get_table(net, RT_TABLE_MAIN); |
0315e382 NF |
271 | if (tb) |
272 | err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); | |
273 | ||
274 | if (err == -EAGAIN) | |
275 | err = -ENETUNREACH; | |
93456b6d | 276 | |
345e9b54 | 277 | rcu_read_unlock(); |
93456b6d | 278 | |
345e9b54 | 279 | return err; |
1da177e4 LT |
280 | } |
281 | ||
3c71006d IS |
282 | static inline bool fib4_rule_default(const struct fib_rule *rule) |
283 | { | |
284 | return true; | |
285 | } | |
286 | ||
1b2a4440 IS |
287 | static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb) |
288 | { | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static inline unsigned int fib4_rules_seq_read(struct net *net) | |
293 | { | |
294 | return 0; | |
295 | } | |
296 | ||
1da177e4 | 297 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
5c3a0fd7 JP |
298 | int __net_init fib4_rules_init(struct net *net); |
299 | void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 300 | |
5c3a0fd7 JP |
301 | struct fib_table *fib_new_table(struct net *net, u32 id); |
302 | struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 | 303 | |
0eeb075f AG |
304 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
305 | struct fib_result *res, unsigned int flags); | |
f4530fa5 DM |
306 | |
307 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, | |
0eeb075f | 308 | struct fib_result *res, unsigned int flags) |
f4530fa5 | 309 | { |
a7e53531 | 310 | struct fib_table *tb; |
0315e382 | 311 | int err = -ENETUNREACH; |
a7e53531 | 312 | |
0eeb075f | 313 | flags |= FIB_LOOKUP_NOREF; |
a7e53531 | 314 | if (net->ipv4.fib_has_custom_rules) |
0eeb075f | 315 | return __fib_lookup(net, flp, res, flags); |
a7e53531 AD |
316 | |
317 | rcu_read_lock(); | |
318 | ||
319 | res->tclassid = 0; | |
320 | ||
0315e382 NF |
321 | tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
322 | if (tb) | |
323 | err = fib_table_lookup(tb, flp, res, flags); | |
324 | ||
325 | if (!err) | |
326 | goto out; | |
327 | ||
328 | tb = rcu_dereference_rtnl(net->ipv4.fib_default); | |
329 | if (tb) | |
330 | err = fib_table_lookup(tb, flp, res, flags); | |
a7e53531 | 331 | |
0315e382 NF |
332 | out: |
333 | if (err == -EAGAIN) | |
334 | err = -ENETUNREACH; | |
a7e53531 AD |
335 | |
336 | rcu_read_unlock(); | |
337 | ||
338 | return err; | |
f4530fa5 DM |
339 | } |
340 | ||
3c71006d | 341 | bool fib4_rule_default(const struct fib_rule *rule); |
1b2a4440 IS |
342 | int fib4_rules_dump(struct net *net, struct notifier_block *nb); |
343 | unsigned int fib4_rules_seq_read(struct net *net); | |
3c71006d | 344 | |
1da177e4 LT |
345 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
346 | ||
347 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 348 | extern const struct nla_policy rtm_ipv4_policy[]; |
5c3a0fd7 JP |
349 | void ip_fib_init(void); |
350 | __be32 fib_compute_spec_dst(struct sk_buff *skb); | |
351 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
352 | u8 tos, int oif, struct net_device *dev, | |
353 | struct in_device *idev, u32 *itag); | |
7a9bc9b8 | 354 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f4530fa5 DM |
355 | static inline int fib_num_tclassid_users(struct net *net) |
356 | { | |
357 | return net->ipv4.fib_num_tclassid_users; | |
358 | } | |
7a9bc9b8 | 359 | #else |
f4530fa5 DM |
360 | static inline int fib_num_tclassid_users(struct net *net) |
361 | { | |
362 | return 0; | |
363 | } | |
7a9bc9b8 | 364 | #endif |
0ddcf43d | 365 | int fib_unmerge(struct net *net); |
14c85021 | 366 | |
1da177e4 | 367 | /* Exported by fib_semantics.c */ |
5c3a0fd7 | 368 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
4f823def | 369 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
5a56a0b3 | 370 | int fib_sync_down_addr(struct net_device *dev, __be32 local); |
8a3d0316 | 371 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
0e884c78 | 372 | |
bf4e0a3d NA |
373 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
374 | int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, | |
375 | const struct sk_buff *skb); | |
376 | #endif | |
0e884c78 | 377 | void fib_select_multipath(struct fib_result *res, int hash); |
3ce58d84 | 378 | void fib_select_path(struct net *net, struct fib_result *res, |
bf4e0a3d | 379 | struct flowi4 *fl4, const struct sk_buff *skb); |
1da177e4 | 380 | |
5348ba85 | 381 | /* Exported by fib_trie.c */ |
5c3a0fd7 | 382 | void fib_trie_init(void); |
0ddcf43d | 383 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
1da177e4 | 384 | |
b6bf3ca0 | 385 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 386 | { |
c7066f70 | 387 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
388 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
389 | u32 rtag; | |
390 | #endif | |
391 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
392 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
85b91b03 | 393 | rtag = res->tclassid; |
1da177e4 LT |
394 | if (*itag == 0) |
395 | *itag = (rtag<<16); | |
396 | *itag |= (rtag>>16); | |
397 | #endif | |
398 | #endif | |
399 | } | |
400 | ||
5c3a0fd7 | 401 | void free_fib_info(struct fib_info *fi); |
1da177e4 | 402 | |
1c677b3d IS |
403 | static inline void fib_info_hold(struct fib_info *fi) |
404 | { | |
0029c0de | 405 | refcount_inc(&fi->fib_clntref); |
1c677b3d IS |
406 | } |
407 | ||
1da177e4 LT |
408 | static inline void fib_info_put(struct fib_info *fi) |
409 | { | |
0029c0de | 410 | if (refcount_dec_and_test(&fi->fib_clntref)) |
1da177e4 LT |
411 | free_fib_info(fi); |
412 | } | |
413 | ||
20380731 | 414 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 JP |
415 | int __net_init fib_proc_init(struct net *net); |
416 | void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
417 | #else |
418 | static inline int fib_proc_init(struct net *net) | |
419 | { | |
420 | return 0; | |
421 | } | |
422 | static inline void fib_proc_exit(struct net *net) | |
423 | { | |
424 | } | |
20380731 ACM |
425 | #endif |
426 | ||
1da177e4 | 427 | #endif /* _NET_FIB_H */ |