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 { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 24 | u8 fc_dst_len; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 25 | u8 fc_tos; |
| 26 | u8 fc_protocol; |
| 27 | u8 fc_scope; |
| 28 | u8 fc_type; |
Thomas Graf | b52f070 | 2006-10-18 20:26:36 -0700 | [diff] [blame] | 29 | /* 3 bytes unused */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 30 | u32 fc_table; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 31 | __be32 fc_dst; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 32 | __be32 fc_gw; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 33 | int fc_oif; |
| 34 | u32 fc_flags; |
| 35 | u32 fc_priority; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 36 | __be32 fc_prefsrc; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 37 | struct nlattr *fc_mx; |
| 38 | struct rtnexthop *fc_mp; |
| 39 | int fc_mx_len; |
| 40 | int fc_mp_len; |
| 41 | u32 fc_flow; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 42 | u32 fc_nlflags; |
| 43 | struct nl_info fc_nlinfo; |
| 44 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | ed49e3c | 2006-09-26 22:13:54 -0700 | [diff] [blame] | 62 | __be32 nh_gw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | int fib_treeref; |
| 73 | atomic_t fib_clntref; |
| 74 | int fib_dead; |
| 75 | unsigned fib_flags; |
| 76 | int fib_protocol; |
Al Viro | b83738a | 2006-09-26 22:14:15 -0700 | [diff] [blame] | 77 | __be32 fib_prefsrc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | u32 fib_priority; |
| 79 | u32 fib_metrics[RTAX_MAX]; |
| 80 | #define fib_mtu fib_metrics[RTAX_MTU-1] |
| 81 | #define fib_window fib_metrics[RTAX_WINDOW-1] |
| 82 | #define fib_rtt fib_metrics[RTAX_RTT-1] |
| 83 | #define fib_advmss fib_metrics[RTAX_ADVMSS-1] |
| 84 | int fib_nhs; |
| 85 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 86 | int fib_power; |
| 87 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | struct fib_info *fi; |
| 103 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 104 | struct fib_rule *r; |
| 105 | #endif |
| 106 | }; |
| 107 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 108 | struct fib_result_nl { |
Al Viro | 80e856e | 2006-09-26 22:19:36 -0700 | [diff] [blame] | 109 | __be32 fl_addr; /* To be looked up*/ |
Thomas Graf | 5f30089 | 2006-11-09 15:21:41 -0800 | [diff] [blame] | 110 | u32 fl_mark; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 111 | unsigned char fl_tos; |
| 112 | unsigned char fl_scope; |
| 113 | unsigned char tb_id_in; |
| 114 | |
| 115 | unsigned char tb_id; /* Results */ |
| 116 | unsigned char prefixlen; |
| 117 | unsigned char nh_sel; |
| 118 | unsigned char type; |
| 119 | unsigned char scope; |
| 120 | int err; |
| 121 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 123 | extern struct hlist_head fib_table_hash[]; |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 126 | |
| 127 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
| 128 | #define FIB_RES_RESET(res) ((res).nh_sel = 0) |
| 129 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 130 | #define FIB_TABLE_HASHSZ 2 |
| 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 133 | |
| 134 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
| 135 | #define FIB_RES_RESET(res) |
| 136 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 137 | #define FIB_TABLE_HASHSZ 256 |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 140 | |
| 141 | #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res)) |
| 142 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
| 143 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) |
| 144 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct fib_table { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 147 | struct hlist_node tb_hlist; |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 148 | u32 tb_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | unsigned tb_stamp; |
Denis V. Lunev | 971b893 | 2007-12-08 00:32:23 -0800 | [diff] [blame] | 150 | int tb_default; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | 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] | 152 | int (*tb_insert)(struct fib_table *, struct fib_config *); |
| 153 | int (*tb_delete)(struct fib_table *, struct fib_config *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | int (*tb_dump)(struct fib_table *table, struct sk_buff *skb, |
| 155 | struct netlink_callback *cb); |
| 156 | int (*tb_flush)(struct fib_table *table); |
| 157 | void (*tb_select_default)(struct fib_table *table, |
| 158 | const struct flowi *flp, struct fib_result *res); |
| 159 | |
| 160 | unsigned char tb_data[0]; |
| 161 | }; |
| 162 | |
| 163 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 164 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 165 | #define TABLE_LOCAL_INDEX 0 |
| 166 | #define TABLE_MAIN_INDEX 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 168 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | { |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 170 | struct hlist_head *ptr; |
| 171 | |
| 172 | ptr = id == RT_TABLE_LOCAL ? |
| 173 | &fib_table_hash[TABLE_LOCAL_INDEX] : |
| 174 | &fib_table_hash[TABLE_MAIN_INDEX]; |
| 175 | return hlist_entry(ptr->first, struct fib_table, tb_hlist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 178 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 180 | return fib_get_table(net, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | static inline int fib_lookup(const struct flowi *flp, struct fib_result *res) |
| 184 | { |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 185 | struct fib_table *table; |
| 186 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 187 | table = fib_get_table(&init_net, RT_TABLE_LOCAL); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 188 | if (!table->tb_lookup(table, flp, res)) |
| 189 | return 0; |
| 190 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 191 | table = fib_get_table(&init_net, RT_TABLE_MAIN); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 192 | if (!table->tb_lookup(table, flp, res)) |
| 193 | return 0; |
| 194 | return -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 197 | static inline void fib_select_default(const struct flowi *flp, |
| 198 | struct fib_result *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 200 | struct fib_table *table = fib_get_table(&init_net, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 202 | table->tb_select_default(table, flp, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 206 | extern int __net_init fib4_rules_init(struct net *net); |
| 207 | extern void __net_exit fib4_rules_exit(struct net *net); |
Pavel Emelyanov | c3e9a35 | 2007-11-06 23:34:04 -0800 | [diff] [blame] | 208 | |
| 209 | #ifdef CONFIG_NET_CLS_ROUTE |
| 210 | extern u32 fib_rules_tclass(struct fib_result *res); |
| 211 | #endif |
| 212 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 213 | extern int fib_lookup(struct flowi *flp, struct fib_result *res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame^] | 215 | extern struct fib_table *fib_new_table(struct net *net, u32 id); |
| 216 | extern struct fib_table *fib_get_table(struct net *net, u32 id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | extern void fib_select_default(const struct flowi *flp, struct fib_result *res); |
| 218 | |
| 219 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 220 | |
| 221 | /* Exported by fib_frontend.c */ |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 222 | extern const struct nla_policy rtm_ipv4_policy[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | extern void ip_fib_init(void); |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 224 | extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
| 225 | struct net_device *dev, __be32 *spec_dst, u32 *itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); |
| 227 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 228 | struct rtentry; |
| 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | /* Exported by fib_semantics.c */ |
Al Viro | d878e72e | 2006-09-26 22:18:13 -0700 | [diff] [blame] | 231 | extern int ip_fib_check_default(__be32 gw, struct net_device *dev); |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 232 | extern int fib_sync_down(__be32 local, struct net_device *dev, int force); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | extern int fib_sync_up(struct net_device *dev); |
Al Viro | b83738a | 2006-09-26 22:14:15 -0700 | [diff] [blame] | 234 | extern __be32 __fib_res_prefsrc(struct fib_result *res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | /* Exported by fib_hash.c */ |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 237 | extern struct fib_table *fib_hash_init(u32 id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | static inline void fib_combine_itag(u32 *itag, struct fib_result *res) |
| 240 | { |
| 241 | #ifdef CONFIG_NET_CLS_ROUTE |
| 242 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 243 | u32 rtag; |
| 244 | #endif |
| 245 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; |
| 246 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 247 | rtag = fib_rules_tclass(res); |
| 248 | if (*itag == 0) |
| 249 | *itag = (rtag<<16); |
| 250 | *itag |= (rtag>>16); |
| 251 | #endif |
| 252 | #endif |
| 253 | } |
| 254 | |
| 255 | extern void free_fib_info(struct fib_info *fi); |
| 256 | |
| 257 | static inline void fib_info_put(struct fib_info *fi) |
| 258 | { |
| 259 | if (atomic_dec_and_test(&fi->fib_clntref)) |
| 260 | free_fib_info(fi); |
| 261 | } |
| 262 | |
| 263 | static inline void fib_res_put(struct fib_result *res) |
| 264 | { |
| 265 | if (res->fi) |
| 266 | fib_info_put(res->fi); |
| 267 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 268 | if (res->r) |
| 269 | fib_rule_put(res->r); |
| 270 | #endif |
| 271 | } |
| 272 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 273 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 61a0265 | 2008-01-10 03:21:09 -0800 | [diff] [blame] | 274 | extern int __net_init fib_proc_init(struct net *net); |
| 275 | extern void __net_exit fib_proc_exit(struct net *net); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 276 | #endif |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | #endif /* _NET_FIB_H */ |