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