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Commit | Line | Data |
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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> |
e1ef4bf2 | 22 | #include <net/fib_rules.h> |
8e773277 | 23 | #include <net/inetpeer.h> |
d26b3a7c | 24 | #include <linux/percpu.h> |
b90eb754 | 25 | #include <linux/notifier.h> |
1da177e4 | 26 | |
4e902c57 | 27 | struct fib_config { |
4e902c57 | 28 | u8 fc_dst_len; |
4e902c57 TG |
29 | u8 fc_tos; |
30 | u8 fc_protocol; | |
31 | u8 fc_scope; | |
32 | u8 fc_type; | |
b52f070c | 33 | /* 3 bytes unused */ |
4e902c57 | 34 | u32 fc_table; |
6d85c10a | 35 | __be32 fc_dst; |
6d85c10a | 36 | __be32 fc_gw; |
4e902c57 TG |
37 | int fc_oif; |
38 | u32 fc_flags; | |
39 | u32 fc_priority; | |
6d85c10a | 40 | __be32 fc_prefsrc; |
4e902c57 TG |
41 | struct nlattr *fc_mx; |
42 | struct rtnexthop *fc_mp; | |
43 | int fc_mx_len; | |
44 | int fc_mp_len; | |
45 | u32 fc_flow; | |
4e902c57 TG |
46 | u32 fc_nlflags; |
47 | struct nl_info fc_nlinfo; | |
571e7226 RP |
48 | struct nlattr *fc_encap; |
49 | u16 fc_encap_type; | |
50 | }; | |
1da177e4 LT |
51 | |
52 | struct fib_info; | |
f2bb4bed | 53 | struct rtable; |
1da177e4 | 54 | |
4895c771 DM |
55 | struct fib_nh_exception { |
56 | struct fib_nh_exception __rcu *fnhe_next; | |
5aad1de5 | 57 | int fnhe_genid; |
4895c771 DM |
58 | __be32 fnhe_daddr; |
59 | u32 fnhe_pmtu; | |
aee06da6 | 60 | __be32 fnhe_gw; |
4895c771 | 61 | unsigned long fnhe_expires; |
2ffae99d TT |
62 | struct rtable __rcu *fnhe_rth_input; |
63 | struct rtable __rcu *fnhe_rth_output; | |
4895c771 | 64 | unsigned long fnhe_stamp; |
deed49df | 65 | struct rcu_head rcu; |
4895c771 DM |
66 | }; |
67 | ||
68 | struct fnhe_hash_bucket { | |
69 | struct fib_nh_exception __rcu *chain; | |
70 | }; | |
71 | ||
d546c621 ED |
72 | #define FNHE_HASH_SHIFT 11 |
73 | #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) | |
4895c771 DM |
74 | #define FNHE_RECLAIM_DEPTH 5 |
75 | ||
1da177e4 LT |
76 | struct fib_nh { |
77 | struct net_device *nh_dev; | |
78 | struct hlist_node nh_hash; | |
79 | struct fib_info *nh_parent; | |
95c96174 | 80 | unsigned int nh_flags; |
1da177e4 LT |
81 | unsigned char nh_scope; |
82 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
83 | int nh_weight; | |
0e884c78 | 84 | atomic_t nh_upper_bound; |
1da177e4 | 85 | #endif |
c7066f70 | 86 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
87 | __u32 nh_tclassid; |
88 | #endif | |
89 | int nh_oif; | |
ed49e3ca | 90 | __be32 nh_gw; |
1fc050a1 | 91 | __be32 nh_saddr; |
436c3b66 | 92 | int nh_saddr_genid; |
d26b3a7c | 93 | struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
54764bb6 | 94 | struct rtable __rcu *nh_rth_input; |
caa41527 | 95 | struct fnhe_hash_bucket __rcu *nh_exceptions; |
571e7226 | 96 | struct lwtunnel_state *nh_lwtstate; |
1da177e4 LT |
97 | }; |
98 | ||
99 | /* | |
100 | * This structure contains data shared by many of routes. | |
101 | */ | |
102 | ||
103 | struct fib_info { | |
104 | struct hlist_node fib_hash; | |
105 | struct hlist_node fib_lhash; | |
7462bd74 | 106 | struct net *fib_net; |
1da177e4 LT |
107 | int fib_treeref; |
108 | atomic_t fib_clntref; | |
95c96174 | 109 | unsigned int fib_flags; |
37e826c5 DM |
110 | unsigned char fib_dead; |
111 | unsigned char fib_protocol; | |
112 | unsigned char fib_scope; | |
f4ef85bb | 113 | unsigned char fib_type; |
b83738ae | 114 | __be32 fib_prefsrc; |
5a56a0b3 | 115 | u32 fib_tb_id; |
1da177e4 | 116 | u32 fib_priority; |
9c150e82 | 117 | u32 *fib_metrics; |
1da177e4 LT |
118 | #define fib_mtu fib_metrics[RTAX_MTU-1] |
119 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
120 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
121 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
122 | int fib_nhs; | |
123 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
0e884c78 | 124 | int fib_weight; |
1da177e4 | 125 | #endif |
c9850187 | 126 | unsigned int fib_offload_cnt; |
ebc0ffae | 127 | struct rcu_head rcu; |
1da177e4 LT |
128 | struct fib_nh fib_nh[0]; |
129 | #define fib_dev fib_nh[0].nh_dev | |
130 | }; | |
131 | ||
132 | ||
133 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
134 | struct fib_rule; | |
135 | #endif | |
136 | ||
5b470441 | 137 | struct fib_table; |
1da177e4 LT |
138 | struct fib_result { |
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 | 177 | |
c9850187 JP |
178 | static inline void fib_info_offload_inc(struct fib_info *fi) |
179 | { | |
180 | fi->fib_offload_cnt++; | |
181 | fi->fib_flags |= RTNH_F_OFFLOAD; | |
182 | } | |
183 | ||
184 | static inline void fib_info_offload_dec(struct fib_info *fi) | |
185 | { | |
186 | if (--fi->fib_offload_cnt == 0) | |
187 | fi->fib_flags &= ~RTNH_F_OFFLOAD; | |
188 | } | |
189 | ||
436c3b66 DM |
190 | #define FIB_RES_SADDR(net, res) \ |
191 | ((FIB_RES_NH(res).nh_saddr_genid == \ | |
192 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ | |
193 | FIB_RES_NH(res).nh_saddr : \ | |
194 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) | |
1da177e4 LT |
195 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
196 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
197 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
198 | ||
436c3b66 DM |
199 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
200 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 201 | |
b90eb754 JP |
202 | struct fib_notifier_info { |
203 | struct net *net; | |
204 | }; | |
205 | ||
206 | struct fib_entry_notifier_info { | |
207 | struct fib_notifier_info info; /* must be first */ | |
208 | u32 dst; | |
209 | int dst_len; | |
210 | struct fib_info *fi; | |
211 | u8 tos; | |
212 | u8 type; | |
213 | u32 tb_id; | |
214 | u32 nlflags; | |
215 | }; | |
216 | ||
217 | enum fib_event_type { | |
218 | FIB_EVENT_ENTRY_ADD, | |
219 | FIB_EVENT_ENTRY_DEL, | |
220 | FIB_EVENT_RULE_ADD, | |
221 | FIB_EVENT_RULE_DEL, | |
222 | }; | |
223 | ||
c3852ef7 IS |
224 | int register_fib_notifier(struct notifier_block *nb, |
225 | void (*cb)(struct notifier_block *nb)); | |
b90eb754 JP |
226 | int unregister_fib_notifier(struct notifier_block *nb); |
227 | int call_fib_notifiers(struct net *net, enum fib_event_type event_type, | |
228 | struct fib_notifier_info *info); | |
229 | ||
1da177e4 | 230 | struct fib_table { |
8e773277 DM |
231 | struct hlist_node tb_hlist; |
232 | u32 tb_id; | |
8e773277 | 233 | int tb_num_default; |
a7e53531 | 234 | struct rcu_head rcu; |
0ddcf43d AD |
235 | unsigned long *tb_data; |
236 | unsigned long __data[0]; | |
1da177e4 LT |
237 | }; |
238 | ||
5c3a0fd7 JP |
239 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
240 | struct fib_result *res, int fib_flags); | |
b90eb754 JP |
241 | int fib_table_insert(struct net *, struct fib_table *, struct fib_config *); |
242 | int fib_table_delete(struct net *, struct fib_table *, struct fib_config *); | |
5c3a0fd7 JP |
243 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
244 | struct netlink_callback *cb); | |
b90eb754 | 245 | int fib_table_flush(struct net *net, struct fib_table *table); |
0ddcf43d | 246 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
3b709334 | 247 | void fib_table_flush_external(struct fib_table *table); |
5c3a0fd7 | 248 | void fib_free_table(struct fib_table *tb); |
4aa2c466 | 249 | |
1da177e4 LT |
250 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
251 | ||
a5a519b2 AD |
252 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
253 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) | |
1da177e4 | 254 | |
8ad4942c | 255 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 256 | { |
a7e53531 | 257 | struct hlist_node *tb_hlist; |
93456b6d DL |
258 | struct hlist_head *ptr; |
259 | ||
260 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
261 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
262 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
a7e53531 AD |
263 | |
264 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); | |
265 | ||
266 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); | |
1da177e4 LT |
267 | } |
268 | ||
8ad4942c | 269 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 270 | { |
8ad4942c | 271 | return fib_get_table(net, id); |
1da177e4 LT |
272 | } |
273 | ||
22bd5b9b | 274 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
0eeb075f | 275 | struct fib_result *res, unsigned int flags) |
1da177e4 | 276 | { |
a7e53531 | 277 | struct fib_table *tb; |
0ddcf43d | 278 | int err = -ENETUNREACH; |
345e9b54 AD |
279 | |
280 | rcu_read_lock(); | |
281 | ||
0ddcf43d | 282 | tb = fib_get_table(net, RT_TABLE_MAIN); |
0315e382 NF |
283 | if (tb) |
284 | err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); | |
285 | ||
286 | if (err == -EAGAIN) | |
287 | err = -ENETUNREACH; | |
93456b6d | 288 | |
345e9b54 | 289 | rcu_read_unlock(); |
93456b6d | 290 | |
345e9b54 | 291 | return err; |
1da177e4 LT |
292 | } |
293 | ||
1da177e4 | 294 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
5c3a0fd7 JP |
295 | int __net_init fib4_rules_init(struct net *net); |
296 | void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 297 | |
5c3a0fd7 JP |
298 | struct fib_table *fib_new_table(struct net *net, u32 id); |
299 | struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 | 300 | |
0eeb075f AG |
301 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
302 | struct fib_result *res, unsigned int flags); | |
f4530fa5 DM |
303 | |
304 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, | |
0eeb075f | 305 | struct fib_result *res, unsigned int flags) |
f4530fa5 | 306 | { |
a7e53531 | 307 | struct fib_table *tb; |
0315e382 | 308 | int err = -ENETUNREACH; |
a7e53531 | 309 | |
0eeb075f | 310 | flags |= FIB_LOOKUP_NOREF; |
a7e53531 | 311 | if (net->ipv4.fib_has_custom_rules) |
0eeb075f | 312 | return __fib_lookup(net, flp, res, flags); |
a7e53531 AD |
313 | |
314 | rcu_read_lock(); | |
315 | ||
316 | res->tclassid = 0; | |
317 | ||
0315e382 NF |
318 | tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
319 | if (tb) | |
320 | err = fib_table_lookup(tb, flp, res, flags); | |
321 | ||
322 | if (!err) | |
323 | goto out; | |
324 | ||
325 | tb = rcu_dereference_rtnl(net->ipv4.fib_default); | |
326 | if (tb) | |
327 | err = fib_table_lookup(tb, flp, res, flags); | |
a7e53531 | 328 | |
0315e382 NF |
329 | out: |
330 | if (err == -EAGAIN) | |
331 | err = -ENETUNREACH; | |
a7e53531 AD |
332 | |
333 | rcu_read_unlock(); | |
334 | ||
335 | return err; | |
f4530fa5 DM |
336 | } |
337 | ||
1da177e4 LT |
338 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
339 | ||
340 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 341 | extern const struct nla_policy rtm_ipv4_policy[]; |
5c3a0fd7 JP |
342 | void ip_fib_init(void); |
343 | __be32 fib_compute_spec_dst(struct sk_buff *skb); | |
344 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
345 | u8 tos, int oif, struct net_device *dev, | |
346 | struct in_device *idev, u32 *itag); | |
7a9bc9b8 | 347 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f4530fa5 DM |
348 | static inline int fib_num_tclassid_users(struct net *net) |
349 | { | |
350 | return net->ipv4.fib_num_tclassid_users; | |
351 | } | |
7a9bc9b8 | 352 | #else |
f4530fa5 DM |
353 | static inline int fib_num_tclassid_users(struct net *net) |
354 | { | |
355 | return 0; | |
356 | } | |
7a9bc9b8 | 357 | #endif |
0ddcf43d | 358 | int fib_unmerge(struct net *net); |
14c85021 | 359 | |
1da177e4 | 360 | /* Exported by fib_semantics.c */ |
5c3a0fd7 | 361 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
4f823def | 362 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
5a56a0b3 | 363 | int fib_sync_down_addr(struct net_device *dev, __be32 local); |
8a3d0316 | 364 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
0e884c78 PN |
365 | |
366 | extern u32 fib_multipath_secret __read_mostly; | |
367 | ||
368 | static inline int fib_multipath_hash(__be32 saddr, __be32 daddr) | |
369 | { | |
0797cbd8 LR |
370 | return jhash_2words((__force u32)saddr, (__force u32)daddr, |
371 | fib_multipath_secret) >> 1; | |
0e884c78 PN |
372 | } |
373 | ||
374 | void fib_select_multipath(struct fib_result *res, int hash); | |
3ce58d84 DA |
375 | void fib_select_path(struct net *net, struct fib_result *res, |
376 | struct flowi4 *fl4, int mp_hash); | |
1da177e4 | 377 | |
5348ba85 | 378 | /* Exported by fib_trie.c */ |
5c3a0fd7 | 379 | void fib_trie_init(void); |
0ddcf43d | 380 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
1da177e4 | 381 | |
b6bf3ca0 | 382 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 383 | { |
c7066f70 | 384 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
385 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
386 | u32 rtag; | |
387 | #endif | |
388 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
389 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
85b91b03 | 390 | rtag = res->tclassid; |
1da177e4 LT |
391 | if (*itag == 0) |
392 | *itag = (rtag<<16); | |
393 | *itag |= (rtag>>16); | |
394 | #endif | |
395 | #endif | |
396 | } | |
397 | ||
5c3a0fd7 | 398 | void free_fib_info(struct fib_info *fi); |
1da177e4 | 399 | |
1c677b3d IS |
400 | static inline void fib_info_hold(struct fib_info *fi) |
401 | { | |
402 | atomic_inc(&fi->fib_clntref); | |
403 | } | |
404 | ||
1da177e4 LT |
405 | static inline void fib_info_put(struct fib_info *fi) |
406 | { | |
407 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
408 | free_fib_info(fi); | |
409 | } | |
410 | ||
20380731 | 411 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 JP |
412 | int __net_init fib_proc_init(struct net *net); |
413 | void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
414 | #else |
415 | static inline int fib_proc_init(struct net *net) | |
416 | { | |
417 | return 0; | |
418 | } | |
419 | static inline void fib_proc_exit(struct net *net) | |
420 | { | |
421 | } | |
20380731 ACM |
422 | #endif |
423 | ||
1da177e4 | 424 | #endif /* _NET_FIB_H */ |