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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 | ||
19 | #include <linux/config.h> | |
20 | #include <net/flow.h> | |
21 | #include <linux/seq_file.h> | |
22 | ||
23 | /* WARNING: The ordering of these elements must match ordering | |
24 | * of RTA_* rtnetlink attribute numbers. | |
25 | */ | |
26 | struct kern_rta { | |
27 | void *rta_dst; | |
28 | void *rta_src; | |
29 | int *rta_iif; | |
30 | int *rta_oif; | |
31 | void *rta_gw; | |
32 | u32 *rta_priority; | |
33 | void *rta_prefsrc; | |
34 | struct rtattr *rta_mx; | |
35 | struct rtattr *rta_mp; | |
36 | unsigned char *rta_protoinfo; | |
37 | u32 *rta_flow; | |
38 | struct rta_cacheinfo *rta_ci; | |
39 | struct rta_session *rta_sess; | |
40 | u32 *rta_mp_alg; | |
41 | }; | |
42 | ||
43 | struct fib_info; | |
44 | ||
45 | struct fib_nh { | |
46 | struct net_device *nh_dev; | |
47 | struct hlist_node nh_hash; | |
48 | struct fib_info *nh_parent; | |
49 | unsigned nh_flags; | |
50 | unsigned char nh_scope; | |
51 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
52 | int nh_weight; | |
53 | int nh_power; | |
54 | #endif | |
55 | #ifdef CONFIG_NET_CLS_ROUTE | |
56 | __u32 nh_tclassid; | |
57 | #endif | |
58 | int nh_oif; | |
59 | u32 nh_gw; | |
60 | }; | |
61 | ||
62 | /* | |
63 | * This structure contains data shared by many of routes. | |
64 | */ | |
65 | ||
66 | struct fib_info { | |
67 | struct hlist_node fib_hash; | |
68 | struct hlist_node fib_lhash; | |
69 | int fib_treeref; | |
70 | atomic_t fib_clntref; | |
71 | int fib_dead; | |
72 | unsigned fib_flags; | |
73 | int fib_protocol; | |
74 | u32 fib_prefsrc; | |
75 | u32 fib_priority; | |
76 | u32 fib_metrics[RTAX_MAX]; | |
77 | #define fib_mtu fib_metrics[RTAX_MTU-1] | |
78 | #define fib_window fib_metrics[RTAX_WINDOW-1] | |
79 | #define fib_rtt fib_metrics[RTAX_RTT-1] | |
80 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] | |
81 | int fib_nhs; | |
82 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
83 | int fib_power; | |
84 | #endif | |
85 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
86 | u32 fib_mp_alg; | |
87 | #endif | |
88 | struct fib_nh fib_nh[0]; | |
89 | #define fib_dev fib_nh[0].nh_dev | |
90 | }; | |
91 | ||
92 | ||
93 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
94 | struct fib_rule; | |
95 | #endif | |
96 | ||
97 | struct fib_result { | |
98 | unsigned char prefixlen; | |
99 | unsigned char nh_sel; | |
100 | unsigned char type; | |
101 | unsigned char scope; | |
102 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
103 | __u32 network; | |
104 | __u32 netmask; | |
105 | #endif | |
106 | struct fib_info *fi; | |
107 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
108 | struct fib_rule *r; | |
109 | #endif | |
110 | }; | |
111 | ||
112 | ||
113 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
114 | ||
115 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) | |
116 | #define FIB_RES_RESET(res) ((res).nh_sel = 0) | |
117 | ||
118 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
119 | ||
120 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) | |
121 | #define FIB_RES_RESET(res) | |
122 | ||
123 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
124 | ||
125 | #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res)) | |
126 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) | |
127 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) | |
128 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) | |
129 | ||
130 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
131 | #define FIB_RES_NETWORK(res) ((res).network) | |
132 | #define FIB_RES_NETMASK(res) ((res).netmask) | |
133 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
134 | #define FIB_RES_NETWORK(res) (0) | |
135 | #define FIB_RES_NETMASK(res) (0) | |
136 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */ | |
137 | ||
138 | struct fib_table { | |
139 | unsigned char tb_id; | |
140 | unsigned tb_stamp; | |
141 | int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res); | |
142 | int (*tb_insert)(struct fib_table *table, struct rtmsg *r, | |
143 | struct kern_rta *rta, struct nlmsghdr *n, | |
144 | struct netlink_skb_parms *req); | |
145 | int (*tb_delete)(struct fib_table *table, struct rtmsg *r, | |
146 | struct kern_rta *rta, struct nlmsghdr *n, | |
147 | struct netlink_skb_parms *req); | |
148 | int (*tb_dump)(struct fib_table *table, struct sk_buff *skb, | |
149 | struct netlink_callback *cb); | |
150 | int (*tb_flush)(struct fib_table *table); | |
151 | void (*tb_select_default)(struct fib_table *table, | |
152 | const struct flowi *flp, struct fib_result *res); | |
153 | ||
154 | unsigned char tb_data[0]; | |
155 | }; | |
156 | ||
157 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
158 | ||
159 | extern struct fib_table *ip_fib_local_table; | |
160 | extern struct fib_table *ip_fib_main_table; | |
161 | ||
162 | static inline struct fib_table *fib_get_table(int id) | |
163 | { | |
164 | if (id != RT_TABLE_LOCAL) | |
165 | return ip_fib_main_table; | |
166 | return ip_fib_local_table; | |
167 | } | |
168 | ||
169 | static inline struct fib_table *fib_new_table(int id) | |
170 | { | |
171 | return fib_get_table(id); | |
172 | } | |
173 | ||
174 | static inline int fib_lookup(const struct flowi *flp, struct fib_result *res) | |
175 | { | |
176 | if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) && | |
177 | ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res)) | |
178 | return -ENETUNREACH; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static inline void fib_select_default(const struct flowi *flp, struct fib_result *res) | |
183 | { | |
184 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
185 | ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res); | |
186 | } | |
187 | ||
188 | #else /* CONFIG_IP_MULTIPLE_TABLES */ | |
189 | #define ip_fib_local_table (fib_tables[RT_TABLE_LOCAL]) | |
190 | #define ip_fib_main_table (fib_tables[RT_TABLE_MAIN]) | |
191 | ||
192 | extern struct fib_table * fib_tables[RT_TABLE_MAX+1]; | |
193 | extern int fib_lookup(const struct flowi *flp, struct fib_result *res); | |
194 | extern struct fib_table *__fib_new_table(int id); | |
195 | extern void fib_rule_put(struct fib_rule *r); | |
196 | ||
197 | static inline struct fib_table *fib_get_table(int id) | |
198 | { | |
199 | if (id == 0) | |
200 | id = RT_TABLE_MAIN; | |
201 | ||
202 | return fib_tables[id]; | |
203 | } | |
204 | ||
205 | static inline struct fib_table *fib_new_table(int id) | |
206 | { | |
207 | if (id == 0) | |
208 | id = RT_TABLE_MAIN; | |
209 | ||
210 | return fib_tables[id] ? : __fib_new_table(id); | |
211 | } | |
212 | ||
213 | extern void fib_select_default(const struct flowi *flp, struct fib_result *res); | |
214 | ||
215 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
216 | ||
217 | /* Exported by fib_frontend.c */ | |
218 | extern void ip_fib_init(void); | |
219 | extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
220 | extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
221 | extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
222 | extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb); | |
223 | extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif, | |
224 | struct net_device *dev, u32 *spec_dst, u32 *itag); | |
225 | extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); | |
226 | ||
227 | /* Exported by fib_semantics.c */ | |
228 | extern int ip_fib_check_default(u32 gw, struct net_device *dev); | |
229 | extern int fib_sync_down(u32 local, struct net_device *dev, int force); | |
230 | extern int fib_sync_up(struct net_device *dev); | |
231 | extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm, | |
232 | struct kern_rta *rta, struct rtentry *r); | |
233 | extern u32 __fib_res_prefsrc(struct fib_result *res); | |
234 | ||
235 | /* Exported by fib_hash.c */ | |
236 | extern struct fib_table *fib_hash_init(int id); | |
237 | ||
238 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
239 | /* Exported by fib_rules.c */ | |
240 | ||
241 | extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
242 | extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg); | |
243 | extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb); | |
244 | #ifdef CONFIG_NET_CLS_ROUTE | |
245 | extern u32 fib_rules_tclass(struct fib_result *res); | |
246 | #endif | |
247 | extern void fib_rules_init(void); | |
248 | #endif | |
249 | ||
250 | static inline void fib_combine_itag(u32 *itag, struct fib_result *res) | |
251 | { | |
252 | #ifdef CONFIG_NET_CLS_ROUTE | |
253 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
254 | u32 rtag; | |
255 | #endif | |
256 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; | |
257 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
258 | rtag = fib_rules_tclass(res); | |
259 | if (*itag == 0) | |
260 | *itag = (rtag<<16); | |
261 | *itag |= (rtag>>16); | |
262 | #endif | |
263 | #endif | |
264 | } | |
265 | ||
266 | extern void free_fib_info(struct fib_info *fi); | |
267 | ||
268 | static inline void fib_info_put(struct fib_info *fi) | |
269 | { | |
270 | if (atomic_dec_and_test(&fi->fib_clntref)) | |
271 | free_fib_info(fi); | |
272 | } | |
273 | ||
274 | static inline void fib_res_put(struct fib_result *res) | |
275 | { | |
276 | if (res->fi) | |
277 | fib_info_put(res->fi); | |
278 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
279 | if (res->r) | |
280 | fib_rule_put(res->r); | |
281 | #endif | |
282 | } | |
283 | ||
284 | #endif /* _NET_FIB_H */ |