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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> |
1da177e4 | 24 | |
4e902c57 | 25 | struct fib_config { |
4e902c57 | 26 | u8 fc_dst_len; |
4e902c57 TG |
27 | u8 fc_tos; |
28 | u8 fc_protocol; | |
29 | u8 fc_scope; | |
30 | u8 fc_type; | |
b52f070c | 31 | /* 3 bytes unused */ |
4e902c57 | 32 | u32 fc_table; |
6d85c10a | 33 | __be32 fc_dst; |
6d85c10a | 34 | __be32 fc_gw; |
4e902c57 TG |
35 | int fc_oif; |
36 | u32 fc_flags; | |
37 | u32 fc_priority; | |
6d85c10a | 38 | __be32 fc_prefsrc; |
4e902c57 TG |
39 | struct nlattr *fc_mx; |
40 | struct rtnexthop *fc_mp; | |
41 | int fc_mx_len; | |
42 | int fc_mp_len; | |
43 | u32 fc_flow; | |
4e902c57 TG |
44 | u32 fc_nlflags; |
45 | struct nl_info fc_nlinfo; | |
46 | }; | |
1da177e4 LT |
47 | |
48 | struct fib_info; | |
f2bb4bed | 49 | struct rtable; |
1da177e4 | 50 | |
4895c771 DM |
51 | struct fib_nh_exception { |
52 | struct fib_nh_exception __rcu *fnhe_next; | |
53 | __be32 fnhe_daddr; | |
54 | u32 fnhe_pmtu; | |
aee06da6 | 55 | __be32 fnhe_gw; |
4895c771 DM |
56 | unsigned long fnhe_expires; |
57 | unsigned long fnhe_stamp; | |
58 | }; | |
59 | ||
60 | struct fnhe_hash_bucket { | |
61 | struct fib_nh_exception __rcu *chain; | |
62 | }; | |
63 | ||
64 | #define FNHE_HASH_SIZE 2048 | |
65 | #define FNHE_RECLAIM_DEPTH 5 | |
66 | ||
1da177e4 LT |
67 | struct fib_nh { |
68 | struct net_device *nh_dev; | |
69 | struct hlist_node nh_hash; | |
70 | struct fib_info *nh_parent; | |
95c96174 | 71 | unsigned int nh_flags; |
1da177e4 LT |
72 | unsigned char nh_scope; |
73 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
74 | int nh_weight; | |
75 | int nh_power; | |
76 | #endif | |
c7066f70 | 77 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
78 | __u32 nh_tclassid; |
79 | #endif | |
80 | int nh_oif; | |
ed49e3ca | 81 | __be32 nh_gw; |
1fc050a1 | 82 | __be32 nh_saddr; |
436c3b66 | 83 | int nh_saddr_genid; |
54764bb6 ED |
84 | struct rtable __rcu *nh_rth_output; |
85 | struct rtable __rcu *nh_rth_input; | |
4895c771 | 86 | struct fnhe_hash_bucket *nh_exceptions; |
1da177e4 LT |
87 | }; |
88 | ||
89 | /* | |
90 | * This structure contains data shared by many of routes. | |
91 | */ | |
92 | ||
93 | struct fib_info { | |
94 | struct hlist_node fib_hash; | |
95 | struct hlist_node fib_lhash; | |
7462bd74 | 96 | struct net *fib_net; |
1da177e4 LT |
97 | int fib_treeref; |
98 | atomic_t fib_clntref; | |
95c96174 | 99 | unsigned int fib_flags; |
37e826c5 DM |
100 | unsigned char fib_dead; |
101 | unsigned char fib_protocol; | |
102 | unsigned char fib_scope; | |
b83738ae | 103 | __be32 fib_prefsrc; |
1da177e4 | 104 | u32 fib_priority; |
9c150e82 | 105 | u32 *fib_metrics; |
1da177e4 LT |
106 | #define fib_mtu fib_metrics[RTAX_MTU-1] |
107 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
108 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
109 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
110 | int fib_nhs; | |
111 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
112 | int fib_power; | |
1da177e4 | 113 | #endif |
ebc0ffae | 114 | struct rcu_head rcu; |
1da177e4 LT |
115 | struct fib_nh fib_nh[0]; |
116 | #define fib_dev fib_nh[0].nh_dev | |
117 | }; | |
118 | ||
119 | ||
120 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
121 | struct fib_rule; | |
122 | #endif | |
123 | ||
5b470441 | 124 | struct fib_table; |
1da177e4 LT |
125 | struct fib_result { |
126 | unsigned char prefixlen; | |
127 | unsigned char nh_sel; | |
128 | unsigned char type; | |
129 | unsigned char scope; | |
85b91b03 | 130 | u32 tclassid; |
1da177e4 | 131 | struct fib_info *fi; |
5b470441 DM |
132 | struct fib_table *table; |
133 | struct list_head *fa_head; | |
1da177e4 LT |
134 | }; |
135 | ||
246955fe | 136 | struct fib_result_nl { |
80e856e1 | 137 | __be32 fl_addr; /* To be looked up*/ |
5f300893 | 138 | u32 fl_mark; |
246955fe RO |
139 | unsigned char fl_tos; |
140 | unsigned char fl_scope; | |
141 | unsigned char tb_id_in; | |
142 | ||
143 | unsigned char tb_id; /* Results */ | |
144 | unsigned char prefixlen; | |
145 | unsigned char nh_sel; | |
146 | unsigned char type; | |
147 | unsigned char scope; | |
148 | int err; | |
149 | }; | |
1da177e4 LT |
150 | |
151 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
152 | ||
153 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) | |
1da177e4 | 154 | |
93456b6d DL |
155 | #define FIB_TABLE_HASHSZ 2 |
156 | ||
1da177e4 LT |
157 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
158 | ||
159 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) | |
1da177e4 | 160 | |
93456b6d DL |
161 | #define FIB_TABLE_HASHSZ 256 |
162 | ||
1da177e4 LT |
163 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
164 | ||
436c3b66 DM |
165 | extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
166 | ||
167 | #define FIB_RES_SADDR(net, res) \ | |
168 | ((FIB_RES_NH(res).nh_saddr_genid == \ | |
169 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ | |
170 | FIB_RES_NH(res).nh_saddr : \ | |
171 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) | |
1da177e4 LT |
172 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
173 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
174 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
175 | ||
436c3b66 DM |
176 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
177 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 178 | |
1da177e4 | 179 | struct fib_table { |
8e773277 DM |
180 | struct hlist_node tb_hlist; |
181 | u32 tb_id; | |
182 | int tb_default; | |
183 | int tb_num_default; | |
8e773277 | 184 | unsigned long tb_data[0]; |
1da177e4 LT |
185 | }; |
186 | ||
22bd5b9b | 187 | extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
ebc0ffae | 188 | struct fib_result *res, int fib_flags); |
16c6cf8b SH |
189 | extern int fib_table_insert(struct fib_table *, struct fib_config *); |
190 | extern int fib_table_delete(struct fib_table *, struct fib_config *); | |
191 | extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb, | |
192 | struct netlink_callback *cb); | |
193 | extern int fib_table_flush(struct fib_table *table); | |
4aa2c466 PE |
194 | extern void fib_free_table(struct fib_table *tb); |
195 | ||
16c6cf8b SH |
196 | |
197 | ||
1da177e4 LT |
198 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
199 | ||
93456b6d DL |
200 | #define TABLE_LOCAL_INDEX 0 |
201 | #define TABLE_MAIN_INDEX 1 | |
1da177e4 | 202 | |
8ad4942c | 203 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 204 | { |
93456b6d DL |
205 | struct hlist_head *ptr; |
206 | ||
207 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
208 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
209 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
93456b6d | 210 | return hlist_entry(ptr->first, struct fib_table, tb_hlist); |
1da177e4 LT |
211 | } |
212 | ||
8ad4942c | 213 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 214 | { |
8ad4942c | 215 | return fib_get_table(net, id); |
1da177e4 LT |
216 | } |
217 | ||
22bd5b9b | 218 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
da0e28cb | 219 | struct fib_result *res) |
1da177e4 | 220 | { |
93456b6d DL |
221 | struct fib_table *table; |
222 | ||
da0e28cb | 223 | table = fib_get_table(net, RT_TABLE_LOCAL); |
ebc0ffae | 224 | if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) |
93456b6d DL |
225 | return 0; |
226 | ||
da0e28cb | 227 | table = fib_get_table(net, RT_TABLE_MAIN); |
ebc0ffae | 228 | if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) |
93456b6d DL |
229 | return 0; |
230 | return -ENETUNREACH; | |
1da177e4 LT |
231 | } |
232 | ||
1da177e4 | 233 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
7b1a74fd DL |
234 | extern int __net_init fib4_rules_init(struct net *net); |
235 | extern void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 236 | |
8ad4942c DL |
237 | extern struct fib_table *fib_new_table(struct net *net, u32 id); |
238 | extern struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 | 239 | |
f4530fa5 DM |
240 | extern int __fib_lookup(struct net *net, struct flowi4 *flp, |
241 | struct fib_result *res); | |
242 | ||
243 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, | |
244 | struct fib_result *res) | |
245 | { | |
246 | if (!net->ipv4.fib_has_custom_rules) { | |
85b91b03 | 247 | res->tclassid = 0; |
f4530fa5 DM |
248 | if (net->ipv4.fib_local && |
249 | !fib_table_lookup(net->ipv4.fib_local, flp, res, | |
250 | FIB_LOOKUP_NOREF)) | |
251 | return 0; | |
252 | if (net->ipv4.fib_main && | |
253 | !fib_table_lookup(net->ipv4.fib_main, flp, res, | |
254 | FIB_LOOKUP_NOREF)) | |
255 | return 0; | |
256 | if (net->ipv4.fib_default && | |
257 | !fib_table_lookup(net->ipv4.fib_default, flp, res, | |
258 | FIB_LOOKUP_NOREF)) | |
259 | return 0; | |
260 | return -ENETUNREACH; | |
261 | } | |
262 | return __fib_lookup(net, flp, res); | |
263 | } | |
264 | ||
1da177e4 LT |
265 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
266 | ||
267 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 268 | extern const struct nla_policy rtm_ipv4_policy[]; |
1da177e4 | 269 | extern void ip_fib_init(void); |
35ebf65e | 270 | extern __be32 fib_compute_spec_dst(struct sk_buff *skb); |
5c04c819 MS |
271 | extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
272 | u8 tos, int oif, struct net_device *dev, | |
9e56e380 | 273 | struct in_device *idev, u32 *itag); |
0c838ff1 | 274 | extern void fib_select_default(struct fib_result *res); |
7a9bc9b8 | 275 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f4530fa5 DM |
276 | static inline int fib_num_tclassid_users(struct net *net) |
277 | { | |
278 | return net->ipv4.fib_num_tclassid_users; | |
279 | } | |
7a9bc9b8 | 280 | #else |
f4530fa5 DM |
281 | static inline int fib_num_tclassid_users(struct net *net) |
282 | { | |
283 | return 0; | |
284 | } | |
7a9bc9b8 | 285 | #endif |
14c85021 | 286 | |
1da177e4 | 287 | /* Exported by fib_semantics.c */ |
d878e72e | 288 | extern int ip_fib_check_default(__be32 gw, struct net_device *dev); |
85326fa5 | 289 | extern int fib_sync_down_dev(struct net_device *dev, int force); |
4814bdbd | 290 | extern int fib_sync_down_addr(struct net *net, __be32 local); |
1fc050a1 | 291 | extern void fib_update_nh_saddrs(struct net_device *dev); |
1da177e4 | 292 | extern int fib_sync_up(struct net_device *dev); |
1b7fe593 | 293 | extern void fib_select_multipath(struct fib_result *res); |
1da177e4 | 294 | |
5348ba85 DM |
295 | /* Exported by fib_trie.c */ |
296 | extern void fib_trie_init(void); | |
297 | extern struct fib_table *fib_trie_table(u32 id); | |
1da177e4 | 298 | |
b6bf3ca0 | 299 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 300 | { |
c7066f70 | 301 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
302 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
303 | u32 rtag; | |
304 | #endif | |
305 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
306 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
85b91b03 | 307 | rtag = res->tclassid; |
1da177e4 LT |
308 | if (*itag == 0) |
309 | *itag = (rtag<<16); | |
310 | *itag |= (rtag>>16); | |
311 | #endif | |
312 | #endif | |
313 | } | |
314 | ||
315 | extern void free_fib_info(struct fib_info *fi); | |
316 | ||
317 | static inline void fib_info_put(struct fib_info *fi) | |
318 | { | |
319 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
320 | free_fib_info(fi); | |
321 | } | |
322 | ||
20380731 | 323 | #ifdef CONFIG_PROC_FS |
61a02653 DL |
324 | extern int __net_init fib_proc_init(struct net *net); |
325 | extern void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
326 | #else |
327 | static inline int fib_proc_init(struct net *net) | |
328 | { | |
329 | return 0; | |
330 | } | |
331 | static inline void fib_proc_exit(struct net *net) | |
332 | { | |
333 | } | |
20380731 ACM |
334 | #endif |
335 | ||
1da177e4 | 336 | #endif /* _NET_FIB_H */ |