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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 TG |
23 | struct fib_config { |
24 | u8 fc_family; | |
25 | u8 fc_dst_len; | |
26 | u8 fc_src_len; | |
27 | u8 fc_tos; | |
28 | u8 fc_protocol; | |
29 | u8 fc_scope; | |
30 | u8 fc_type; | |
31 | /* 1 byte unused */ | |
32 | u32 fc_table; | |
33 | u32 fc_dst; | |
34 | u32 fc_src; | |
35 | u32 fc_gw; | |
36 | int fc_oif; | |
37 | u32 fc_flags; | |
38 | u32 fc_priority; | |
39 | u32 fc_prefsrc; | |
40 | struct nlattr *fc_mx; | |
41 | struct rtnexthop *fc_mp; | |
42 | int fc_mx_len; | |
43 | int fc_mp_len; | |
44 | u32 fc_flow; | |
45 | u32 fc_mp_alg; | |
46 | u32 fc_nlflags; | |
47 | struct nl_info fc_nlinfo; | |
48 | }; | |
1da177e4 LT |
49 | |
50 | struct fib_info; | |
51 | ||
52 | struct fib_nh { | |
53 | struct net_device *nh_dev; | |
54 | struct hlist_node nh_hash; | |
55 | struct fib_info *nh_parent; | |
56 | unsigned nh_flags; | |
57 | unsigned char nh_scope; | |
58 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
59 | int nh_weight; | |
60 | int nh_power; | |
61 | #endif | |
62 | #ifdef CONFIG_NET_CLS_ROUTE | |
63 | __u32 nh_tclassid; | |
64 | #endif | |
65 | int nh_oif; | |
66 | u32 nh_gw; | |
67 | }; | |
68 | ||
69 | /* | |
70 | * This structure contains data shared by many of routes. | |
71 | */ | |
72 | ||
73 | struct fib_info { | |
74 | struct hlist_node fib_hash; | |
75 | struct hlist_node fib_lhash; | |
76 | int fib_treeref; | |
77 | atomic_t fib_clntref; | |
78 | int fib_dead; | |
79 | unsigned fib_flags; | |
80 | int fib_protocol; | |
81 | u32 fib_prefsrc; | |
82 | u32 fib_priority; | |
83 | u32 fib_metrics[RTAX_MAX]; | |
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; | |
91 | #endif | |
92 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
93 | u32 fib_mp_alg; | |
94 | #endif | |
95 | struct fib_nh fib_nh[0]; | |
96 | #define fib_dev fib_nh[0].nh_dev | |
97 | }; | |
98 | ||
99 | ||
100 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
101 | struct fib_rule; | |
102 | #endif | |
103 | ||
104 | struct fib_result { | |
105 | unsigned char prefixlen; | |
106 | unsigned char nh_sel; | |
107 | unsigned char type; | |
108 | unsigned char scope; | |
109 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
110 | __u32 network; | |
111 | __u32 netmask; | |
112 | #endif | |
113 | struct fib_info *fi; | |
114 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
115 | struct fib_rule *r; | |
116 | #endif | |
117 | }; | |
118 | ||
246955fe RO |
119 | struct fib_result_nl { |
120 | u32 fl_addr; /* To be looked up*/ | |
121 | u32 fl_fwmark; | |
122 | unsigned char fl_tos; | |
123 | unsigned char fl_scope; | |
124 | unsigned char tb_id_in; | |
125 | ||
126 | unsigned char tb_id; /* Results */ | |
127 | unsigned char prefixlen; | |
128 | unsigned char nh_sel; | |
129 | unsigned char type; | |
130 | unsigned char scope; | |
131 | int err; | |
132 | }; | |
1da177e4 LT |
133 | |
134 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
135 | ||
136 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) | |
137 | #define FIB_RES_RESET(res) ((res).nh_sel = 0) | |
138 | ||
139 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
140 | ||
141 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) | |
142 | #define FIB_RES_RESET(res) | |
143 | ||
144 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
145 | ||
146 | #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res)) | |
147 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) | |
148 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
149 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
150 | ||
151 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
152 | #define FIB_RES_NETWORK(res) ((res).network) | |
153 | #define FIB_RES_NETMASK(res) ((res).netmask) | |
154 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
155 | #define FIB_RES_NETWORK(res) (0) | |
156 | #define FIB_RES_NETMASK(res) (0) | |
157 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */ | |
158 | ||
159 | struct fib_table { | |
1af5a8c4 | 160 | struct hlist_node tb_hlist; |
2dfe55b4 | 161 | u32 tb_id; |
1da177e4 LT |
162 | unsigned tb_stamp; |
163 | int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res); | |
4e902c57 TG |
164 | int (*tb_insert)(struct fib_table *, struct fib_config *); |
165 | int (*tb_delete)(struct fib_table *, struct fib_config *); | |
1da177e4 LT |
166 | int (*tb_dump)(struct fib_table *table, struct sk_buff *skb, |
167 | struct netlink_callback *cb); | |
168 | int (*tb_flush)(struct fib_table *table); | |
169 | void (*tb_select_default)(struct fib_table *table, | |
170 | const struct flowi *flp, struct fib_result *res); | |
171 | ||
172 | unsigned char tb_data[0]; | |
173 | }; | |
174 | ||
175 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
176 | ||
177 | extern struct fib_table *ip_fib_local_table; | |
178 | extern struct fib_table *ip_fib_main_table; | |
179 | ||
2dfe55b4 | 180 | static inline struct fib_table *fib_get_table(u32 id) |
1da177e4 LT |
181 | { |
182 | if (id != RT_TABLE_LOCAL) | |
183 | return ip_fib_main_table; | |
184 | return ip_fib_local_table; | |
185 | } | |
186 | ||
2dfe55b4 | 187 | static inline struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
188 | { |
189 | return fib_get_table(id); | |
190 | } | |
191 | ||
192 | static inline int fib_lookup(const struct flowi *flp, struct fib_result *res) | |
193 | { | |
194 | if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) && | |
195 | ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res)) | |
196 | return -ENETUNREACH; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static inline void fib_select_default(const struct flowi *flp, struct fib_result *res) | |
201 | { | |
202 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
203 | ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res); | |
204 | } | |
205 | ||
206 | #else /* CONFIG_IP_MULTIPLE_TABLES */ | |
1af5a8c4 PM |
207 | #define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL) |
208 | #define ip_fib_main_table fib_get_table(RT_TABLE_MAIN) | |
1da177e4 | 209 | |
e1ef4bf2 | 210 | extern int fib_lookup(struct flowi *flp, struct fib_result *res); |
1da177e4 | 211 | |
1af5a8c4 PM |
212 | extern struct fib_table *fib_new_table(u32 id); |
213 | extern struct fib_table *fib_get_table(u32 id); | |
1da177e4 LT |
214 | extern void fib_select_default(const struct flowi *flp, struct fib_result *res); |
215 | ||
216 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
217 | ||
218 | /* Exported by fib_frontend.c */ | |
d889ce3b | 219 | extern struct nla_policy rtm_ipv4_policy[]; |
1da177e4 LT |
220 | extern void ip_fib_init(void); |
221 | extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
222 | extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
223 | extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
224 | extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb); | |
d9c9df8c AV |
225 | extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
226 | struct net_device *dev, __be32 *spec_dst, u32 *itag); | |
1da177e4 LT |
227 | extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); |
228 | ||
14c85021 ACM |
229 | struct rtentry; |
230 | ||
1da177e4 LT |
231 | /* Exported by fib_semantics.c */ |
232 | extern int ip_fib_check_default(u32 gw, struct net_device *dev); | |
233 | extern int fib_sync_down(u32 local, struct net_device *dev, int force); | |
234 | extern int fib_sync_up(struct net_device *dev); | |
1da177e4 LT |
235 | extern u32 __fib_res_prefsrc(struct fib_result *res); |
236 | ||
237 | /* Exported by fib_hash.c */ | |
2dfe55b4 | 238 | extern struct fib_table *fib_hash_init(u32 id); |
1da177e4 LT |
239 | |
240 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
e1ef4bf2 TG |
241 | extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb); |
242 | ||
243 | extern void __init fib4_rules_init(void); | |
1da177e4 | 244 | |
1da177e4 LT |
245 | #ifdef CONFIG_NET_CLS_ROUTE |
246 | extern u32 fib_rules_tclass(struct fib_result *res); | |
247 | #endif | |
e1ef4bf2 | 248 | |
1da177e4 LT |
249 | #endif |
250 | ||
251 | static inline void fib_combine_itag(u32 *itag, struct fib_result *res) | |
252 | { | |
253 | #ifdef CONFIG_NET_CLS_ROUTE | |
254 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
255 | u32 rtag; | |
256 | #endif | |
257 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
258 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
259 | rtag = fib_rules_tclass(res); | |
260 | if (*itag == 0) | |
261 | *itag = (rtag<<16); | |
262 | *itag |= (rtag>>16); | |
263 | #endif | |
264 | #endif | |
265 | } | |
266 | ||
267 | extern void free_fib_info(struct fib_info *fi); | |
268 | ||
269 | static inline void fib_info_put(struct fib_info *fi) | |
270 | { | |
271 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
272 | free_fib_info(fi); | |
273 | } | |
274 | ||
275 | static inline void fib_res_put(struct fib_result *res) | |
276 | { | |
277 | if (res->fi) | |
278 | fib_info_put(res->fi); | |
279 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
280 | if (res->r) | |
281 | fib_rule_put(res->r); | |
282 | #endif | |
283 | } | |
284 | ||
20380731 ACM |
285 | #ifdef CONFIG_PROC_FS |
286 | extern int fib_proc_init(void); | |
287 | extern void fib_proc_exit(void); | |
288 | #endif | |
289 | ||
1da177e4 | 290 | #endif /* _NET_FIB_H */ |