Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <net/flow.h> |
| 20 | #include <linux/seq_file.h> |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 21 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 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 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 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 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 160 | struct hlist_node tb_hlist; |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 161 | u32 tb_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | unsigned tb_stamp; |
| 163 | int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 164 | int (*tb_insert)(struct fib_table *, struct fib_config *); |
| 165 | int (*tb_delete)(struct fib_table *, struct fib_config *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 180 | static inline struct fib_table *fib_get_table(u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
| 182 | if (id != RT_TABLE_LOCAL) |
| 183 | return ip_fib_main_table; |
| 184 | return ip_fib_local_table; |
| 185 | } |
| 186 | |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 187 | static inline struct fib_table *fib_new_table(u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 207 | #define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL) |
| 208 | #define ip_fib_main_table fib_get_table(RT_TABLE_MAIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 210 | extern int fib_lookup(struct flowi *flp, struct fib_result *res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 212 | extern struct fib_table *fib_new_table(u32 id); |
| 213 | extern struct fib_table *fib_get_table(u32 id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 219 | extern struct nla_policy rtm_ipv4_policy[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
| 225 | extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif, |
| 226 | struct net_device *dev, u32 *spec_dst, u32 *itag); |
| 227 | extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); |
| 228 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 229 | struct rtentry; |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | extern u32 __fib_res_prefsrc(struct fib_result *res); |
| 236 | |
| 237 | /* Exported by fib_hash.c */ |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 238 | extern struct fib_table *fib_hash_init(u32 id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 241 | extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 243 | extern void __init fib4_rules_init(void); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | #ifdef CONFIG_NET_CLS_ROUTE |
| 246 | extern u32 fib_rules_tclass(struct fib_result *res); |
| 247 | #endif |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 285 | #ifdef CONFIG_PROC_FS |
| 286 | extern int fib_proc_init(void); |
| 287 | extern void fib_proc_exit(void); |
| 288 | #endif |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | #endif /* _NET_FIB_H */ |