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
19 #include <net/flow.h>
20 #include <linux/seq_file.h>
21 #include <net/fib_rules.h>
22
23 struct fib_config {
24 u8 fc_dst_len;
25 u8 fc_tos;
26 u8 fc_protocol;
27 u8 fc_scope;
28 u8 fc_type;
29 /* 3 bytes unused */
30 u32 fc_table;
31 __be32 fc_dst;
32 __be32 fc_gw;
33 int fc_oif;
34 u32 fc_flags;
35 u32 fc_priority;
36 __be32 fc_prefsrc;
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_nlflags;
43 struct nl_info fc_nlinfo;
44 };
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
58 #ifdef CONFIG_NET_CLS_ROUTE
59 __u32 nh_tclassid;
60 #endif
61 int nh_oif;
62 __be32 nh_gw;
63 };
64
65 /*
66 * This structure contains data shared by many of routes.
67 */
68
69 struct fib_info {
70 struct hlist_node fib_hash;
71 struct hlist_node fib_lhash;
72 struct net *fib_net;
73 int fib_treeref;
74 atomic_t fib_clntref;
75 int fib_dead;
76 unsigned fib_flags;
77 int fib_protocol;
78 __be32 fib_prefsrc;
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 struct fib_nh fib_nh[0];
90 #define fib_dev fib_nh[0].nh_dev
91 };
92
93
94 #ifdef CONFIG_IP_MULTIPLE_TABLES
95 struct fib_rule;
96 #endif
97
98 struct fib_result {
99 unsigned char prefixlen;
100 unsigned char nh_sel;
101 unsigned char type;
102 unsigned char scope;
103 struct fib_info *fi;
104 #ifdef CONFIG_IP_MULTIPLE_TABLES
105 struct fib_rule *r;
106 #endif
107 };
108
109 struct fib_result_nl {
110 __be32 fl_addr; /* To be looked up*/
111 u32 fl_mark;
112 unsigned char fl_tos;
113 unsigned char fl_scope;
114 unsigned char tb_id_in;
115
116 unsigned char tb_id; /* Results */
117 unsigned char prefixlen;
118 unsigned char nh_sel;
119 unsigned char type;
120 unsigned char scope;
121 int err;
122 };
123
124 #ifdef CONFIG_IP_ROUTE_MULTIPATH
125
126 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
127 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
128
129 #define FIB_TABLE_HASHSZ 2
130
131 #else /* CONFIG_IP_ROUTE_MULTIPATH */
132
133 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
134 #define FIB_RES_RESET(res)
135
136 #define FIB_TABLE_HASHSZ 256
137
138 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
139
140 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
141 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
142 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
143 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
144
145 struct fib_table {
146 struct hlist_node tb_hlist;
147 u32 tb_id;
148 unsigned tb_stamp;
149 int tb_default;
150 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
151 int (*tb_insert)(struct fib_table *, struct fib_config *);
152 int (*tb_delete)(struct fib_table *, struct fib_config *);
153 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
154 struct netlink_callback *cb);
155 int (*tb_flush)(struct fib_table *table);
156 void (*tb_select_default)(struct fib_table *table,
157 const struct flowi *flp, struct fib_result *res);
158
159 unsigned char tb_data[0];
160 };
161
162 #ifndef CONFIG_IP_MULTIPLE_TABLES
163
164 #define TABLE_LOCAL_INDEX 0
165 #define TABLE_MAIN_INDEX 1
166
167 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
168 {
169 struct hlist_head *ptr;
170
171 ptr = id == RT_TABLE_LOCAL ?
172 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
173 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
174 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
175 }
176
177 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
178 {
179 return fib_get_table(net, id);
180 }
181
182 static inline int fib_lookup(struct net *net, const struct flowi *flp,
183 struct fib_result *res)
184 {
185 struct fib_table *table;
186
187 table = fib_get_table(net, RT_TABLE_LOCAL);
188 if (!table->tb_lookup(table, flp, res))
189 return 0;
190
191 table = fib_get_table(net, RT_TABLE_MAIN);
192 if (!table->tb_lookup(table, flp, res))
193 return 0;
194 return -ENETUNREACH;
195 }
196
197 #else /* CONFIG_IP_MULTIPLE_TABLES */
198 extern int __net_init fib4_rules_init(struct net *net);
199 extern void __net_exit fib4_rules_exit(struct net *net);
200
201 #ifdef CONFIG_NET_CLS_ROUTE
202 extern u32 fib_rules_tclass(struct fib_result *res);
203 #endif
204
205 extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
206
207 extern struct fib_table *fib_new_table(struct net *net, u32 id);
208 extern struct fib_table *fib_get_table(struct net *net, u32 id);
209
210 #endif /* CONFIG_IP_MULTIPLE_TABLES */
211
212 /* Exported by fib_frontend.c */
213 extern const struct nla_policy rtm_ipv4_policy[];
214 extern void ip_fib_init(void);
215 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
216 struct net_device *dev, __be32 *spec_dst, u32 *itag);
217 extern void fib_select_default(struct net *net, const struct flowi *flp,
218 struct fib_result *res);
219
220 /* Exported by fib_semantics.c */
221 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
222 extern int fib_sync_down_dev(struct net_device *dev, int force);
223 extern int fib_sync_down_addr(struct net *net, __be32 local);
224 extern int fib_sync_up(struct net_device *dev);
225 extern __be32 __fib_res_prefsrc(struct fib_result *res);
226 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
227
228 /* Exported by fib_{hash|trie}.c */
229 extern void fib_hash_init(void);
230 extern struct fib_table *fib_hash_table(u32 id);
231
232 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
233 {
234 #ifdef CONFIG_NET_CLS_ROUTE
235 #ifdef CONFIG_IP_MULTIPLE_TABLES
236 u32 rtag;
237 #endif
238 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
239 #ifdef CONFIG_IP_MULTIPLE_TABLES
240 rtag = fib_rules_tclass(res);
241 if (*itag == 0)
242 *itag = (rtag<<16);
243 *itag |= (rtag>>16);
244 #endif
245 #endif
246 }
247
248 extern void free_fib_info(struct fib_info *fi);
249
250 static inline void fib_info_put(struct fib_info *fi)
251 {
252 if (atomic_dec_and_test(&fi->fib_clntref))
253 free_fib_info(fi);
254 }
255
256 static inline void fib_res_put(struct fib_result *res)
257 {
258 if (res->fi)
259 fib_info_put(res->fi);
260 #ifdef CONFIG_IP_MULTIPLE_TABLES
261 if (res->r)
262 fib_rule_put(res->r);
263 #endif
264 }
265
266 #ifdef CONFIG_PROC_FS
267 extern int __net_init fib_proc_init(struct net *net);
268 extern void __net_exit fib_proc_exit(struct net *net);
269 #else
270 static inline int fib_proc_init(struct net *net)
271 {
272 return 0;
273 }
274 static inline void fib_proc_exit(struct net *net)
275 {
276 }
277 #endif
278
279 #endif /* _NET_FIB_H */
280
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