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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> |
1da177e4 | 25 | |
4e902c57 | 26 | struct fib_config { |
4e902c57 | 27 | u8 fc_dst_len; |
4e902c57 TG |
28 | u8 fc_tos; |
29 | u8 fc_protocol; | |
30 | u8 fc_scope; | |
31 | u8 fc_type; | |
b52f070c | 32 | /* 3 bytes unused */ |
4e902c57 | 33 | u32 fc_table; |
6d85c10a | 34 | __be32 fc_dst; |
6d85c10a | 35 | __be32 fc_gw; |
4e902c57 TG |
36 | int fc_oif; |
37 | u32 fc_flags; | |
38 | u32 fc_priority; | |
6d85c10a | 39 | __be32 fc_prefsrc; |
4e902c57 TG |
40 | struct nlattr *fc_mx; |
41 | struct rtnexthop *fc_mp; | |
42 | int fc_mx_len; | |
43 | int fc_mp_len; | |
44 | u32 fc_flow; | |
4e902c57 TG |
45 | u32 fc_nlflags; |
46 | struct nl_info fc_nlinfo; | |
47 | }; | |
1da177e4 LT |
48 | |
49 | struct fib_info; | |
f2bb4bed | 50 | struct rtable; |
1da177e4 | 51 | |
4895c771 DM |
52 | struct fib_nh_exception { |
53 | struct fib_nh_exception __rcu *fnhe_next; | |
5aad1de5 | 54 | int fnhe_genid; |
4895c771 DM |
55 | __be32 fnhe_daddr; |
56 | u32 fnhe_pmtu; | |
aee06da6 | 57 | __be32 fnhe_gw; |
4895c771 | 58 | unsigned long fnhe_expires; |
2ffae99d TT |
59 | struct rtable __rcu *fnhe_rth_input; |
60 | struct rtable __rcu *fnhe_rth_output; | |
4895c771 DM |
61 | unsigned long fnhe_stamp; |
62 | }; | |
63 | ||
64 | struct fnhe_hash_bucket { | |
65 | struct fib_nh_exception __rcu *chain; | |
66 | }; | |
67 | ||
d546c621 ED |
68 | #define FNHE_HASH_SHIFT 11 |
69 | #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) | |
4895c771 DM |
70 | #define FNHE_RECLAIM_DEPTH 5 |
71 | ||
1da177e4 LT |
72 | struct fib_nh { |
73 | struct net_device *nh_dev; | |
74 | struct hlist_node nh_hash; | |
75 | struct fib_info *nh_parent; | |
95c96174 | 76 | unsigned int nh_flags; |
1da177e4 LT |
77 | unsigned char nh_scope; |
78 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
79 | int nh_weight; | |
80 | int nh_power; | |
81 | #endif | |
c7066f70 | 82 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
83 | __u32 nh_tclassid; |
84 | #endif | |
85 | int nh_oif; | |
ed49e3ca | 86 | __be32 nh_gw; |
1fc050a1 | 87 | __be32 nh_saddr; |
436c3b66 | 88 | int nh_saddr_genid; |
d26b3a7c | 89 | struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
54764bb6 | 90 | struct rtable __rcu *nh_rth_input; |
caa41527 | 91 | struct fnhe_hash_bucket __rcu *nh_exceptions; |
1da177e4 LT |
92 | }; |
93 | ||
94 | /* | |
95 | * This structure contains data shared by many of routes. | |
96 | */ | |
97 | ||
98 | struct fib_info { | |
99 | struct hlist_node fib_hash; | |
100 | struct hlist_node fib_lhash; | |
7462bd74 | 101 | struct net *fib_net; |
1da177e4 LT |
102 | int fib_treeref; |
103 | atomic_t fib_clntref; | |
95c96174 | 104 | unsigned int fib_flags; |
37e826c5 DM |
105 | unsigned char fib_dead; |
106 | unsigned char fib_protocol; | |
107 | unsigned char fib_scope; | |
f4ef85bb | 108 | unsigned char fib_type; |
b83738ae | 109 | __be32 fib_prefsrc; |
1da177e4 | 110 | u32 fib_priority; |
9c150e82 | 111 | u32 *fib_metrics; |
1da177e4 LT |
112 | #define fib_mtu fib_metrics[RTAX_MTU-1] |
113 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
114 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
115 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
116 | int fib_nhs; | |
117 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
118 | int fib_power; | |
1da177e4 | 119 | #endif |
ebc0ffae | 120 | struct rcu_head rcu; |
1da177e4 LT |
121 | struct fib_nh fib_nh[0]; |
122 | #define fib_dev fib_nh[0].nh_dev | |
123 | }; | |
124 | ||
125 | ||
126 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
127 | struct fib_rule; | |
128 | #endif | |
129 | ||
5b470441 | 130 | struct fib_table; |
1da177e4 LT |
131 | struct fib_result { |
132 | unsigned char prefixlen; | |
133 | unsigned char nh_sel; | |
134 | unsigned char type; | |
135 | unsigned char scope; | |
85b91b03 | 136 | u32 tclassid; |
1da177e4 | 137 | struct fib_info *fi; |
5b470441 | 138 | struct fib_table *table; |
56315f9e | 139 | struct hlist_head *fa_head; |
1da177e4 LT |
140 | }; |
141 | ||
246955fe | 142 | struct fib_result_nl { |
80e856e1 | 143 | __be32 fl_addr; /* To be looked up*/ |
5f300893 | 144 | u32 fl_mark; |
246955fe RO |
145 | unsigned char fl_tos; |
146 | unsigned char fl_scope; | |
147 | unsigned char tb_id_in; | |
148 | ||
149 | unsigned char tb_id; /* Results */ | |
150 | unsigned char prefixlen; | |
151 | unsigned char nh_sel; | |
152 | unsigned char type; | |
153 | unsigned char scope; | |
154 | int err; | |
155 | }; | |
1da177e4 LT |
156 | |
157 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 158 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
1da177e4 | 159 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 160 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
5b9e12db | 161 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 162 | |
5b9e12db | 163 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
93456b6d | 164 | #define FIB_TABLE_HASHSZ 256 |
5b9e12db DL |
165 | #else |
166 | #define FIB_TABLE_HASHSZ 2 | |
167 | #endif | |
1da177e4 | 168 | |
5c3a0fd7 | 169 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
436c3b66 DM |
170 | |
171 | #define FIB_RES_SADDR(net, res) \ | |
172 | ((FIB_RES_NH(res).nh_saddr_genid == \ | |
173 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ | |
174 | FIB_RES_NH(res).nh_saddr : \ | |
175 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) | |
1da177e4 LT |
176 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
177 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
178 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
179 | ||
436c3b66 DM |
180 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
181 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 182 | |
1da177e4 | 183 | struct fib_table { |
8e773277 DM |
184 | struct hlist_node tb_hlist; |
185 | u32 tb_id; | |
8e773277 | 186 | int tb_num_default; |
a7e53531 | 187 | struct rcu_head rcu; |
0ddcf43d AD |
188 | unsigned long *tb_data; |
189 | unsigned long __data[0]; | |
1da177e4 LT |
190 | }; |
191 | ||
5c3a0fd7 JP |
192 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
193 | struct fib_result *res, int fib_flags); | |
194 | int fib_table_insert(struct fib_table *, struct fib_config *); | |
195 | int fib_table_delete(struct fib_table *, struct fib_config *); | |
196 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, | |
197 | struct netlink_callback *cb); | |
198 | int fib_table_flush(struct fib_table *table); | |
0ddcf43d | 199 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
104616e7 | 200 | void fib_table_flush_external(struct fib_table *table); |
5c3a0fd7 | 201 | void fib_free_table(struct fib_table *tb); |
4aa2c466 | 202 | |
1da177e4 LT |
203 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
204 | ||
a5a519b2 AD |
205 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
206 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) | |
1da177e4 | 207 | |
8ad4942c | 208 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 209 | { |
a7e53531 | 210 | struct hlist_node *tb_hlist; |
93456b6d DL |
211 | struct hlist_head *ptr; |
212 | ||
213 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
214 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
215 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
a7e53531 AD |
216 | |
217 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); | |
218 | ||
219 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); | |
1da177e4 LT |
220 | } |
221 | ||
8ad4942c | 222 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 223 | { |
8ad4942c | 224 | return fib_get_table(net, id); |
1da177e4 LT |
225 | } |
226 | ||
22bd5b9b | 227 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
0eeb075f | 228 | struct fib_result *res, unsigned int flags) |
1da177e4 | 229 | { |
a7e53531 | 230 | struct fib_table *tb; |
0ddcf43d | 231 | int err = -ENETUNREACH; |
345e9b54 AD |
232 | |
233 | rcu_read_lock(); | |
234 | ||
0ddcf43d | 235 | tb = fib_get_table(net, RT_TABLE_MAIN); |
0eeb075f | 236 | if (tb && !fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF)) |
0ddcf43d | 237 | err = 0; |
93456b6d | 238 | |
345e9b54 | 239 | rcu_read_unlock(); |
93456b6d | 240 | |
345e9b54 | 241 | return err; |
1da177e4 LT |
242 | } |
243 | ||
1da177e4 | 244 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
5c3a0fd7 JP |
245 | int __net_init fib4_rules_init(struct net *net); |
246 | void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 247 | |
5c3a0fd7 JP |
248 | struct fib_table *fib_new_table(struct net *net, u32 id); |
249 | struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 | 250 | |
0eeb075f AG |
251 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
252 | struct fib_result *res, unsigned int flags); | |
f4530fa5 DM |
253 | |
254 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, | |
0eeb075f | 255 | struct fib_result *res, unsigned int flags) |
f4530fa5 | 256 | { |
a7e53531 AD |
257 | struct fib_table *tb; |
258 | int err; | |
259 | ||
0eeb075f | 260 | flags |= FIB_LOOKUP_NOREF; |
a7e53531 | 261 | if (net->ipv4.fib_has_custom_rules) |
0eeb075f | 262 | return __fib_lookup(net, flp, res, flags); |
a7e53531 AD |
263 | |
264 | rcu_read_lock(); | |
265 | ||
266 | res->tclassid = 0; | |
267 | ||
268 | for (err = 0; !err; err = -ENETUNREACH) { | |
a7e53531 | 269 | tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
0eeb075f | 270 | if (tb && !fib_table_lookup(tb, flp, res, flags)) |
a7e53531 AD |
271 | break; |
272 | ||
273 | tb = rcu_dereference_rtnl(net->ipv4.fib_default); | |
0eeb075f | 274 | if (tb && !fib_table_lookup(tb, flp, res, flags)) |
a7e53531 | 275 | break; |
f4530fa5 | 276 | } |
a7e53531 AD |
277 | |
278 | rcu_read_unlock(); | |
279 | ||
280 | return err; | |
f4530fa5 DM |
281 | } |
282 | ||
1da177e4 LT |
283 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
284 | ||
285 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 286 | extern const struct nla_policy rtm_ipv4_policy[]; |
5c3a0fd7 JP |
287 | void ip_fib_init(void); |
288 | __be32 fib_compute_spec_dst(struct sk_buff *skb); | |
289 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
290 | u8 tos, int oif, struct net_device *dev, | |
291 | struct in_device *idev, u32 *itag); | |
2392debc | 292 | void fib_select_default(const struct flowi4 *flp, struct fib_result *res); |
7a9bc9b8 | 293 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f4530fa5 DM |
294 | static inline int fib_num_tclassid_users(struct net *net) |
295 | { | |
296 | return net->ipv4.fib_num_tclassid_users; | |
297 | } | |
7a9bc9b8 | 298 | #else |
f4530fa5 DM |
299 | static inline int fib_num_tclassid_users(struct net *net) |
300 | { | |
301 | return 0; | |
302 | } | |
7a9bc9b8 | 303 | #endif |
0ddcf43d | 304 | int fib_unmerge(struct net *net); |
104616e7 | 305 | void fib_flush_external(struct net *net); |
14c85021 | 306 | |
1da177e4 | 307 | /* Exported by fib_semantics.c */ |
5c3a0fd7 | 308 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
8a3d0316 | 309 | int fib_sync_down_dev(struct net_device *dev, unsigned long event); |
5c3a0fd7 | 310 | int fib_sync_down_addr(struct net *net, __be32 local); |
8a3d0316 | 311 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
5c3a0fd7 | 312 | void fib_select_multipath(struct fib_result *res); |
1da177e4 | 313 | |
5348ba85 | 314 | /* Exported by fib_trie.c */ |
5c3a0fd7 | 315 | void fib_trie_init(void); |
0ddcf43d | 316 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
1da177e4 | 317 | |
b6bf3ca0 | 318 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 319 | { |
c7066f70 | 320 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
321 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
322 | u32 rtag; | |
323 | #endif | |
324 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
325 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
85b91b03 | 326 | rtag = res->tclassid; |
1da177e4 LT |
327 | if (*itag == 0) |
328 | *itag = (rtag<<16); | |
329 | *itag |= (rtag>>16); | |
330 | #endif | |
331 | #endif | |
332 | } | |
333 | ||
5c3a0fd7 | 334 | void free_fib_info(struct fib_info *fi); |
1da177e4 LT |
335 | |
336 | static inline void fib_info_put(struct fib_info *fi) | |
337 | { | |
338 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
339 | free_fib_info(fi); | |
340 | } | |
341 | ||
20380731 | 342 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 JP |
343 | int __net_init fib_proc_init(struct net *net); |
344 | void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
345 | #else |
346 | static inline int fib_proc_init(struct net *net) | |
347 | { | |
348 | return 0; | |
349 | } | |
350 | static inline void fib_proc_exit(struct net *net) | |
351 | { | |
352 | } | |
20380731 ACM |
353 | #endif |
354 | ||
1da177e4 | 355 | #endif /* _NET_FIB_H */ |