ip_fib.h
上传用户:lgb322
上传日期:2013-02-24
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文件大小:8k
- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * Definitions for the Forwarding Information Base.
- *
- * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _NET_IP_FIB_H
- #define _NET_IP_FIB_H
- #include <linux/config.h>
- struct kern_rta
- {
- void *rta_dst;
- void *rta_src;
- int *rta_iif;
- int *rta_oif;
- void *rta_gw;
- u32 *rta_priority;
- void *rta_prefsrc;
- struct rtattr *rta_mx;
- struct rtattr *rta_mp;
- unsigned char *rta_protoinfo;
- unsigned char *rta_flow;
- struct rta_cacheinfo *rta_ci;
- };
- struct fib_nh
- {
- struct net_device *nh_dev;
- unsigned nh_flags;
- unsigned char nh_scope;
- #ifdef CONFIG_IP_ROUTE_MULTIPATH
- int nh_weight;
- int nh_power;
- #endif
- #ifdef CONFIG_NET_CLS_ROUTE
- __u32 nh_tclassid;
- #endif
- int nh_oif;
- u32 nh_gw;
- };
- /*
- * This structure contains data shared by many of routes.
- */
- struct fib_info
- {
- struct fib_info *fib_next;
- struct fib_info *fib_prev;
- int fib_treeref;
- atomic_t fib_clntref;
- int fib_dead;
- unsigned fib_flags;
- int fib_protocol;
- u32 fib_prefsrc;
- u32 fib_priority;
- unsigned fib_metrics[RTAX_MAX];
- #define fib_mtu fib_metrics[RTAX_MTU-1]
- #define fib_window fib_metrics[RTAX_WINDOW-1]
- #define fib_rtt fib_metrics[RTAX_RTT-1]
- #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
- int fib_nhs;
- #ifdef CONFIG_IP_ROUTE_MULTIPATH
- int fib_power;
- #endif
- struct fib_nh fib_nh[0];
- #define fib_dev fib_nh[0].nh_dev
- };
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- struct fib_rule;
- #endif
- struct fib_result
- {
- unsigned char prefixlen;
- unsigned char nh_sel;
- unsigned char type;
- unsigned char scope;
- struct fib_info *fi;
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- struct fib_rule *r;
- #endif
- };
- #ifdef CONFIG_IP_ROUTE_MULTIPATH
- #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
- #define FIB_RES_RESET(res) ((res).nh_sel = 0)
- #else /* CONFIG_IP_ROUTE_MULTIPATH */
- #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
- #define FIB_RES_RESET(res)
- #endif /* CONFIG_IP_ROUTE_MULTIPATH */
- #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
- #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
- #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
- #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
- struct fib_table
- {
- unsigned char tb_id;
- unsigned tb_stamp;
- int (*tb_lookup)(struct fib_table *tb, const struct rt_key *key, struct fib_result *res);
- int (*tb_insert)(struct fib_table *table, struct rtmsg *r,
- struct kern_rta *rta, struct nlmsghdr *n,
- struct netlink_skb_parms *req);
- int (*tb_delete)(struct fib_table *table, struct rtmsg *r,
- struct kern_rta *rta, struct nlmsghdr *n,
- struct netlink_skb_parms *req);
- int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
- struct netlink_callback *cb);
- int (*tb_flush)(struct fib_table *table);
- int (*tb_get_info)(struct fib_table *table, char *buf,
- int first, int count);
- void (*tb_select_default)(struct fib_table *table,
- const struct rt_key *key, struct fib_result *res);
- unsigned char tb_data[0];
- };
- #ifndef CONFIG_IP_MULTIPLE_TABLES
- extern struct fib_table *local_table;
- extern struct fib_table *main_table;
- static inline struct fib_table *fib_get_table(int id)
- {
- if (id != RT_TABLE_LOCAL)
- return main_table;
- return local_table;
- }
- static inline struct fib_table *fib_new_table(int id)
- {
- return fib_get_table(id);
- }
- static inline int fib_lookup(const struct rt_key *key, struct fib_result *res)
- {
- if (local_table->tb_lookup(local_table, key, res) &&
- main_table->tb_lookup(main_table, key, res))
- return -ENETUNREACH;
- return 0;
- }
- static inline void fib_select_default(const struct rt_key *key, struct fib_result *res)
- {
- if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
- main_table->tb_select_default(main_table, key, res);
- }
- #else /* CONFIG_IP_MULTIPLE_TABLES */
- #define local_table (fib_tables[RT_TABLE_LOCAL])
- #define main_table (fib_tables[RT_TABLE_MAIN])
- extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
- extern int fib_lookup(const struct rt_key *key, struct fib_result *res);
- extern struct fib_table *__fib_new_table(int id);
- extern void fib_rule_put(struct fib_rule *r);
- static inline struct fib_table *fib_get_table(int id)
- {
- if (id == 0)
- id = RT_TABLE_MAIN;
- return fib_tables[id];
- }
- static inline struct fib_table *fib_new_table(int id)
- {
- if (id == 0)
- id = RT_TABLE_MAIN;
- return fib_tables[id] ? : __fib_new_table(id);
- }
- extern void fib_select_default(const struct rt_key *key, struct fib_result *res);
- #endif /* CONFIG_IP_MULTIPLE_TABLES */
- /* Exported by fib_frontend.c */
- extern void ip_fib_init(void);
- extern void fib_flush(void);
- extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
- extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
- extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
- extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
- extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
- struct net_device *dev, u32 *spec_dst, u32 *itag);
- extern void fib_select_multipath(const struct rt_key *key, struct fib_result *res);
- /* Exported by fib_semantics.c */
- extern int ip_fib_check_default(u32 gw, struct net_device *dev);
- extern void fib_release_info(struct fib_info *);
- extern int fib_semantic_match(int type, struct fib_info *,
- const struct rt_key *, struct fib_result*);
- extern struct fib_info *fib_create_info(const struct rtmsg *r, struct kern_rta *rta,
- const struct nlmsghdr *, int *err);
- extern int fib_nh_match(struct rtmsg *r, struct nlmsghdr *, struct kern_rta *rta, struct fib_info *fi);
- extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
- u8 tb_id, u8 type, u8 scope, void *dst, int dst_len, u8 tos,
- struct fib_info *fi);
- extern int fib_sync_down(u32 local, struct net_device *dev, int force);
- extern int fib_sync_up(struct net_device *dev);
- extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
- struct kern_rta *rta, struct rtentry *r);
- extern void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer);
- extern u32 __fib_res_prefsrc(struct fib_result *res);
- /* Exported by fib_hash.c */
- extern struct fib_table *fib_hash_init(int id);
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- /* Exported by fib_rules.c */
- extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
- extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
- extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);
- extern u32 fib_rules_map_destination(u32 daddr, struct fib_result *res);
- #ifdef CONFIG_NET_CLS_ROUTE
- extern u32 fib_rules_tclass(struct fib_result *res);
- #endif
- extern u32 fib_rules_policy(u32 saddr, struct fib_result *res, unsigned *flags);
- extern void fib_rules_init(void);
- #endif
- static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
- {
- #ifdef CONFIG_NET_CLS_ROUTE
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- u32 rtag;
- #endif
- *itag = FIB_RES_NH(*res).nh_tclassid<<16;
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- rtag = fib_rules_tclass(res);
- if (*itag == 0)
- *itag = (rtag<<16);
- *itag |= (rtag>>16);
- #endif
- #endif
- }
- extern void free_fib_info(struct fib_info *fi);
- static inline void fib_info_put(struct fib_info *fi)
- {
- if (atomic_dec_and_test(&fi->fib_clntref))
- free_fib_info(fi);
- }
- static inline void fib_res_put(struct fib_result *res)
- {
- if (res->fi)
- fib_info_put(res->fi);
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- if (res->r)
- fib_rule_put(res->r);
- #endif
- }
- #endif /* _NET_FIB_H */