i386/linux/linux-2.3.21/include/net/ip_fib.h

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