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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; | |
42 | u32 fc_mp_alg; | |
43 | u32 fc_nlflags; | |
44 | struct nl_info fc_nlinfo; | |
45 | }; | |
1da177e4 LT |
46 | |
47 | struct fib_info; | |
48 | ||
49 | struct fib_nh { | |
50 | struct net_device *nh_dev; | |
51 | struct hlist_node nh_hash; | |
52 | struct fib_info *nh_parent; | |
53 | unsigned nh_flags; | |
54 | unsigned char nh_scope; | |
55 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
56 | int nh_weight; | |
57 | int nh_power; | |
58 | #endif | |
59 | #ifdef CONFIG_NET_CLS_ROUTE | |
60 | __u32 nh_tclassid; | |
61 | #endif | |
62 | int nh_oif; | |
ed49e3ca | 63 | __be32 nh_gw; |
1da177e4 LT |
64 | }; |
65 | ||
66 | /* | |
67 | * This structure contains data shared by many of routes. | |
68 | */ | |
69 | ||
70 | struct fib_info { | |
71 | struct hlist_node fib_hash; | |
72 | struct hlist_node fib_lhash; | |
73 | int fib_treeref; | |
74 | atomic_t fib_clntref; | |
75 | int fib_dead; | |
76 | unsigned fib_flags; | |
77 | int fib_protocol; | |
b83738ae | 78 | __be32 fib_prefsrc; |
1da177e4 LT |
79 | u32 fib_priority; |
80 | u32 fib_metrics[RTAX_MAX]; | |
81 | #define fib_mtu fib_metrics[RTAX_MTU-1] | |
82 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
83 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
84 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
85 | int fib_nhs; | |
86 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
87 | int fib_power; | |
88 | #endif | |
89 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
90 | u32 fib_mp_alg; | |
91 | #endif | |
92 | struct fib_nh fib_nh[0]; | |
93 | #define fib_dev fib_nh[0].nh_dev | |
94 | }; | |
95 | ||
96 | ||
97 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
98 | struct fib_rule; | |
99 | #endif | |
100 | ||
101 | struct fib_result { | |
102 | unsigned char prefixlen; | |
103 | unsigned char nh_sel; | |
104 | unsigned char type; | |
105 | unsigned char scope; | |
106 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
80e856e1 AV |
107 | __be32 network; |
108 | __be32 netmask; | |
1da177e4 LT |
109 | #endif |
110 | struct fib_info *fi; | |
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]) | |
134 | #define FIB_RES_RESET(res) ((res).nh_sel = 0) | |
135 | ||
136 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
137 | ||
138 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) | |
139 | #define FIB_RES_RESET(res) | |
140 | ||
141 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
142 | ||
143 | #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res)) | |
144 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) | |
145 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
146 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
147 | ||
148 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
149 | #define FIB_RES_NETWORK(res) ((res).network) | |
150 | #define FIB_RES_NETMASK(res) ((res).netmask) | |
151 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
152 | #define FIB_RES_NETWORK(res) (0) | |
153 | #define FIB_RES_NETMASK(res) (0) | |
154 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */ | |
155 | ||
156 | struct fib_table { | |
1af5a8c4 | 157 | struct hlist_node tb_hlist; |
2dfe55b4 | 158 | u32 tb_id; |
1da177e4 LT |
159 | unsigned tb_stamp; |
160 | int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res); | |
4e902c57 TG |
161 | int (*tb_insert)(struct fib_table *, struct fib_config *); |
162 | int (*tb_delete)(struct fib_table *, struct fib_config *); | |
1da177e4 LT |
163 | int (*tb_dump)(struct fib_table *table, struct sk_buff *skb, |
164 | struct netlink_callback *cb); | |
165 | int (*tb_flush)(struct fib_table *table); | |
166 | void (*tb_select_default)(struct fib_table *table, | |
167 | const struct flowi *flp, struct fib_result *res); | |
168 | ||
169 | unsigned char tb_data[0]; | |
170 | }; | |
171 | ||
172 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
173 | ||
174 | extern struct fib_table *ip_fib_local_table; | |
175 | extern struct fib_table *ip_fib_main_table; | |
176 | ||
2dfe55b4 | 177 | static inline struct fib_table *fib_get_table(u32 id) |
1da177e4 LT |
178 | { |
179 | if (id != RT_TABLE_LOCAL) | |
180 | return ip_fib_main_table; | |
181 | return ip_fib_local_table; | |
182 | } | |
183 | ||
2dfe55b4 | 184 | static inline struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
185 | { |
186 | return fib_get_table(id); | |
187 | } | |
188 | ||
189 | static inline int fib_lookup(const struct flowi *flp, struct fib_result *res) | |
190 | { | |
191 | if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) && | |
192 | ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res)) | |
193 | return -ENETUNREACH; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static inline void fib_select_default(const struct flowi *flp, struct fib_result *res) | |
198 | { | |
199 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
200 | ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res); | |
201 | } | |
202 | ||
203 | #else /* CONFIG_IP_MULTIPLE_TABLES */ | |
1af5a8c4 PM |
204 | #define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL) |
205 | #define ip_fib_main_table fib_get_table(RT_TABLE_MAIN) | |
1da177e4 | 206 | |
e1ef4bf2 | 207 | extern int fib_lookup(struct flowi *flp, struct fib_result *res); |
1da177e4 | 208 | |
1af5a8c4 PM |
209 | extern struct fib_table *fib_new_table(u32 id); |
210 | extern struct fib_table *fib_get_table(u32 id); | |
1da177e4 LT |
211 | extern void fib_select_default(const struct flowi *flp, struct fib_result *res); |
212 | ||
213 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
214 | ||
215 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 216 | extern const struct nla_policy rtm_ipv4_policy[]; |
1da177e4 | 217 | extern void ip_fib_init(void); |
d9c9df8c AV |
218 | extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
219 | struct net_device *dev, __be32 *spec_dst, u32 *itag); | |
1da177e4 LT |
220 | extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); |
221 | ||
14c85021 ACM |
222 | struct rtentry; |
223 | ||
1da177e4 | 224 | /* Exported by fib_semantics.c */ |
d878e72e | 225 | extern int ip_fib_check_default(__be32 gw, struct net_device *dev); |
81f7bf6c | 226 | extern int fib_sync_down(__be32 local, struct net_device *dev, int force); |
1da177e4 | 227 | extern int fib_sync_up(struct net_device *dev); |
b83738ae | 228 | extern __be32 __fib_res_prefsrc(struct fib_result *res); |
1da177e4 LT |
229 | |
230 | /* Exported by fib_hash.c */ | |
2dfe55b4 | 231 | extern struct fib_table *fib_hash_init(u32 id); |
1da177e4 LT |
232 | |
233 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
e1ef4bf2 | 234 | extern void __init fib4_rules_init(void); |
1da177e4 | 235 | |
1da177e4 LT |
236 | #ifdef CONFIG_NET_CLS_ROUTE |
237 | extern u32 fib_rules_tclass(struct fib_result *res); | |
238 | #endif | |
e1ef4bf2 | 239 | |
1da177e4 LT |
240 | #endif |
241 | ||
242 | static inline void fib_combine_itag(u32 *itag, struct fib_result *res) | |
243 | { | |
244 | #ifdef CONFIG_NET_CLS_ROUTE | |
245 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
246 | u32 rtag; | |
247 | #endif | |
248 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
249 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
250 | rtag = fib_rules_tclass(res); | |
251 | if (*itag == 0) | |
252 | *itag = (rtag<<16); | |
253 | *itag |= (rtag>>16); | |
254 | #endif | |
255 | #endif | |
256 | } | |
257 | ||
258 | extern void free_fib_info(struct fib_info *fi); | |
259 | ||
260 | static inline void fib_info_put(struct fib_info *fi) | |
261 | { | |
262 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
263 | free_fib_info(fi); | |
264 | } | |
265 | ||
266 | static inline void fib_res_put(struct fib_result *res) | |
267 | { | |
268 | if (res->fi) | |
269 | fib_info_put(res->fi); | |
270 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
271 | if (res->r) | |
272 | fib_rule_put(res->r); | |
273 | #endif | |
274 | } | |
275 | ||
20380731 ACM |
276 | #ifdef CONFIG_PROC_FS |
277 | extern int fib_proc_init(void); | |
278 | extern void fib_proc_exit(void); | |
279 | #endif | |
280 | ||
1da177e4 | 281 | #endif /* _NET_FIB_H */ |