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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> | |
e1ef4bf2 | 21 | #include <net/fib_rules.h> |
1da177e4 | 22 | |
4e902c57 | 23 | struct fib_config { |
4e902c57 | 24 | u8 fc_dst_len; |
4e902c57 TG |
25 | u8 fc_tos; |
26 | u8 fc_protocol; | |
27 | u8 fc_scope; | |
28 | u8 fc_type; | |
b52f070c | 29 | /* 3 bytes unused */ |
4e902c57 | 30 | u32 fc_table; |
6d85c10a | 31 | __be32 fc_dst; |
6d85c10a | 32 | __be32 fc_gw; |
4e902c57 TG |
33 | int fc_oif; |
34 | u32 fc_flags; | |
35 | u32 fc_priority; | |
6d85c10a | 36 | __be32 fc_prefsrc; |
4e902c57 TG |
37 | struct nlattr *fc_mx; |
38 | struct rtnexthop *fc_mp; | |
39 | int fc_mx_len; | |
40 | int fc_mp_len; | |
41 | u32 fc_flow; | |
4e902c57 TG |
42 | u32 fc_nlflags; |
43 | struct nl_info fc_nlinfo; | |
44 | }; | |
1da177e4 LT |
45 | |
46 | struct fib_info; | |
47 | ||
48 | struct fib_nh { | |
49 | struct net_device *nh_dev; | |
50 | struct hlist_node nh_hash; | |
51 | struct fib_info *nh_parent; | |
52 | unsigned nh_flags; | |
53 | unsigned char nh_scope; | |
54 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
55 | int nh_weight; | |
56 | int nh_power; | |
57 | #endif | |
c7066f70 | 58 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
59 | __u32 nh_tclassid; |
60 | #endif | |
61 | int nh_oif; | |
ed49e3ca | 62 | __be32 nh_gw; |
1fc050a1 | 63 | __be32 nh_saddr; |
436c3b66 | 64 | int nh_saddr_genid; |
1da177e4 LT |
65 | }; |
66 | ||
67 | /* | |
68 | * This structure contains data shared by many of routes. | |
69 | */ | |
70 | ||
71 | struct fib_info { | |
72 | struct hlist_node fib_hash; | |
73 | struct hlist_node fib_lhash; | |
7462bd74 | 74 | struct net *fib_net; |
1da177e4 LT |
75 | int fib_treeref; |
76 | atomic_t fib_clntref; | |
1da177e4 | 77 | unsigned fib_flags; |
37e826c5 DM |
78 | unsigned char fib_dead; |
79 | unsigned char fib_protocol; | |
80 | unsigned char fib_scope; | |
b83738ae | 81 | __be32 fib_prefsrc; |
1da177e4 | 82 | u32 fib_priority; |
9c150e82 | 83 | u32 *fib_metrics; |
1da177e4 LT |
84 | #define fib_mtu fib_metrics[RTAX_MTU-1] |
85 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
86 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
87 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
88 | int fib_nhs; | |
89 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
90 | int fib_power; | |
1da177e4 | 91 | #endif |
ebc0ffae | 92 | struct rcu_head rcu; |
1da177e4 LT |
93 | struct fib_nh fib_nh[0]; |
94 | #define fib_dev fib_nh[0].nh_dev | |
95 | }; | |
96 | ||
97 | ||
98 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
99 | struct fib_rule; | |
100 | #endif | |
101 | ||
5b470441 | 102 | struct fib_table; |
1da177e4 LT |
103 | struct fib_result { |
104 | unsigned char prefixlen; | |
105 | unsigned char nh_sel; | |
106 | unsigned char type; | |
107 | unsigned char scope; | |
1da177e4 | 108 | struct fib_info *fi; |
5b470441 DM |
109 | struct fib_table *table; |
110 | struct list_head *fa_head; | |
1da177e4 LT |
111 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
112 | struct fib_rule *r; | |
113 | #endif | |
114 | }; | |
115 | ||
246955fe | 116 | struct fib_result_nl { |
80e856e1 | 117 | __be32 fl_addr; /* To be looked up*/ |
5f300893 | 118 | u32 fl_mark; |
246955fe RO |
119 | unsigned char fl_tos; |
120 | unsigned char fl_scope; | |
121 | unsigned char tb_id_in; | |
122 | ||
123 | unsigned char tb_id; /* Results */ | |
124 | unsigned char prefixlen; | |
125 | unsigned char nh_sel; | |
126 | unsigned char type; | |
127 | unsigned char scope; | |
128 | int err; | |
129 | }; | |
1da177e4 LT |
130 | |
131 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
132 | ||
133 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) | |
1da177e4 | 134 | |
93456b6d DL |
135 | #define FIB_TABLE_HASHSZ 2 |
136 | ||
1da177e4 LT |
137 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
138 | ||
139 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) | |
1da177e4 | 140 | |
93456b6d DL |
141 | #define FIB_TABLE_HASHSZ 256 |
142 | ||
1da177e4 LT |
143 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
144 | ||
436c3b66 DM |
145 | extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
146 | ||
147 | #define FIB_RES_SADDR(net, res) \ | |
148 | ((FIB_RES_NH(res).nh_saddr_genid == \ | |
149 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ | |
150 | FIB_RES_NH(res).nh_saddr : \ | |
151 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) | |
1da177e4 LT |
152 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
153 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
154 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
155 | ||
436c3b66 DM |
156 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
157 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 158 | |
1da177e4 | 159 | struct fib_table { |
1af5a8c4 | 160 | struct hlist_node tb_hlist; |
2dfe55b4 | 161 | u32 tb_id; |
971b893e | 162 | int tb_default; |
21d8c49e DM |
163 | int tb_num_default; |
164 | unsigned long tb_data[0]; | |
1da177e4 LT |
165 | }; |
166 | ||
22bd5b9b | 167 | extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
ebc0ffae | 168 | struct fib_result *res, int fib_flags); |
16c6cf8b SH |
169 | extern int fib_table_insert(struct fib_table *, struct fib_config *); |
170 | extern int fib_table_delete(struct fib_table *, struct fib_config *); | |
171 | extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb, | |
172 | struct netlink_callback *cb); | |
173 | extern int fib_table_flush(struct fib_table *table); | |
4aa2c466 PE |
174 | extern void fib_free_table(struct fib_table *tb); |
175 | ||
16c6cf8b SH |
176 | |
177 | ||
1da177e4 LT |
178 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
179 | ||
93456b6d DL |
180 | #define TABLE_LOCAL_INDEX 0 |
181 | #define TABLE_MAIN_INDEX 1 | |
1da177e4 | 182 | |
8ad4942c | 183 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 184 | { |
93456b6d DL |
185 | struct hlist_head *ptr; |
186 | ||
187 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
188 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
189 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
93456b6d | 190 | return hlist_entry(ptr->first, struct fib_table, tb_hlist); |
1da177e4 LT |
191 | } |
192 | ||
8ad4942c | 193 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 194 | { |
8ad4942c | 195 | return fib_get_table(net, id); |
1da177e4 LT |
196 | } |
197 | ||
22bd5b9b | 198 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
da0e28cb | 199 | struct fib_result *res) |
1da177e4 | 200 | { |
93456b6d DL |
201 | struct fib_table *table; |
202 | ||
da0e28cb | 203 | table = fib_get_table(net, RT_TABLE_LOCAL); |
ebc0ffae | 204 | if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) |
93456b6d DL |
205 | return 0; |
206 | ||
da0e28cb | 207 | table = fib_get_table(net, RT_TABLE_MAIN); |
ebc0ffae | 208 | if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) |
93456b6d DL |
209 | return 0; |
210 | return -ENETUNREACH; | |
1da177e4 LT |
211 | } |
212 | ||
1da177e4 | 213 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
7b1a74fd DL |
214 | extern int __net_init fib4_rules_init(struct net *net); |
215 | extern void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 216 | |
c7066f70 | 217 | #ifdef CONFIG_IP_ROUTE_CLASSID |
982721f3 | 218 | extern u32 fib_rules_tclass(const struct fib_result *res); |
c3e9a353 PE |
219 | #endif |
220 | ||
22bd5b9b | 221 | extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res); |
1da177e4 | 222 | |
8ad4942c DL |
223 | extern struct fib_table *fib_new_table(struct net *net, u32 id); |
224 | extern struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 LT |
225 | |
226 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
227 | ||
228 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 229 | extern const struct nla_policy rtm_ipv4_policy[]; |
1da177e4 | 230 | extern void ip_fib_init(void); |
5c04c819 MS |
231 | extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
232 | u8 tos, int oif, struct net_device *dev, | |
233 | __be32 *spec_dst, u32 *itag); | |
0c838ff1 | 234 | extern void fib_select_default(struct fib_result *res); |
14c85021 | 235 | |
1da177e4 | 236 | /* Exported by fib_semantics.c */ |
d878e72e | 237 | extern int ip_fib_check_default(__be32 gw, struct net_device *dev); |
85326fa5 | 238 | extern int fib_sync_down_dev(struct net_device *dev, int force); |
4814bdbd | 239 | extern int fib_sync_down_addr(struct net *net, __be32 local); |
1fc050a1 | 240 | extern void fib_update_nh_saddrs(struct net_device *dev); |
1da177e4 | 241 | extern int fib_sync_up(struct net_device *dev); |
1b7fe593 | 242 | extern void fib_select_multipath(struct fib_result *res); |
1da177e4 | 243 | |
5348ba85 DM |
244 | /* Exported by fib_trie.c */ |
245 | extern void fib_trie_init(void); | |
246 | extern struct fib_table *fib_trie_table(u32 id); | |
1da177e4 | 247 | |
b6bf3ca0 | 248 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 249 | { |
c7066f70 | 250 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
251 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
252 | u32 rtag; | |
253 | #endif | |
254 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
255 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
256 | rtag = fib_rules_tclass(res); | |
257 | if (*itag == 0) | |
258 | *itag = (rtag<<16); | |
259 | *itag |= (rtag>>16); | |
260 | #endif | |
261 | #endif | |
262 | } | |
263 | ||
264 | extern void free_fib_info(struct fib_info *fi); | |
265 | ||
266 | static inline void fib_info_put(struct fib_info *fi) | |
267 | { | |
268 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
269 | free_fib_info(fi); | |
270 | } | |
271 | ||
20380731 | 272 | #ifdef CONFIG_PROC_FS |
61a02653 DL |
273 | extern int __net_init fib_proc_init(struct net *net); |
274 | extern void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
275 | #else |
276 | static inline int fib_proc_init(struct net *net) | |
277 | { | |
278 | return 0; | |
279 | } | |
280 | static inline void fib_proc_exit(struct net *net) | |
281 | { | |
282 | } | |
20380731 ACM |
283 | #endif |
284 | ||
1da177e4 | 285 | #endif /* _NET_FIB_H */ |