| /* |
| * 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 <net/flow.h> |
| #include <linux/seq_file.h> |
| #include <net/fib_rules.h> |
| |
| struct fib_config { |
| u8 fc_dst_len; |
| u8 fc_tos; |
| u8 fc_protocol; |
| u8 fc_scope; |
| u8 fc_type; |
| /* 3 bytes unused */ |
| u32 fc_table; |
| __be32 fc_dst; |
| __be32 fc_gw; |
| int fc_oif; |
| u32 fc_flags; |
| u32 fc_priority; |
| __be32 fc_prefsrc; |
| struct nlattr *fc_mx; |
| struct rtnexthop *fc_mp; |
| int fc_mx_len; |
| int fc_mp_len; |
| u32 fc_flow; |
| u32 fc_nlflags; |
| struct nl_info fc_nlinfo; |
| }; |
| |
| struct fib_info; |
| |
| struct fib_nh { |
| struct net_device *nh_dev; |
| struct hlist_node nh_hash; |
| struct fib_info *nh_parent; |
| 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; |
| __be32 nh_gw; |
| }; |
| |
| /* |
| * This structure contains data shared by many of routes. |
| */ |
| |
| struct fib_info { |
| struct hlist_node fib_hash; |
| struct hlist_node fib_lhash; |
| struct net *fib_net; |
| int fib_treeref; |
| atomic_t fib_clntref; |
| int fib_dead; |
| unsigned fib_flags; |
| int fib_protocol; |
| __be32 fib_prefsrc; |
| u32 fib_priority; |
| u32 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 |
| }; |
| |
| struct fib_result_nl { |
| __be32 fl_addr; /* To be looked up*/ |
| u32 fl_mark; |
| unsigned char fl_tos; |
| unsigned char fl_scope; |
| unsigned char tb_id_in; |
| |
| unsigned char tb_id; /* Results */ |
| unsigned char prefixlen; |
| unsigned char nh_sel; |
| unsigned char type; |
| unsigned char scope; |
| int err; |
| }; |
| |
| #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| |
| #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
| |
| #define FIB_TABLE_HASHSZ 2 |
| |
| #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
| |
| #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
| |
| #define FIB_TABLE_HASHSZ 256 |
| |
| #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 { |
| struct hlist_node tb_hlist; |
| u32 tb_id; |
| int tb_default; |
| unsigned char tb_data[0]; |
| }; |
| |
| extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp, |
| struct fib_result *res); |
| extern int fib_table_insert(struct fib_table *, struct fib_config *); |
| extern int fib_table_delete(struct fib_table *, struct fib_config *); |
| extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
| struct netlink_callback *cb); |
| extern int fib_table_flush(struct fib_table *table); |
| extern void fib_table_select_default(struct fib_table *table, |
| const struct flowi *flp, |
| struct fib_result *res); |
| |
| |
| #ifndef CONFIG_IP_MULTIPLE_TABLES |
| |
| #define TABLE_LOCAL_INDEX 0 |
| #define TABLE_MAIN_INDEX 1 |
| |
| static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
| { |
| struct hlist_head *ptr; |
| |
| ptr = id == RT_TABLE_LOCAL ? |
| &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
| &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; |
| return hlist_entry(ptr->first, struct fib_table, tb_hlist); |
| } |
| |
| static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
| { |
| return fib_get_table(net, id); |
| } |
| |
| static inline int fib_lookup(struct net *net, const struct flowi *flp, |
| struct fib_result *res) |
| { |
| struct fib_table *table; |
| |
| table = fib_get_table(net, RT_TABLE_LOCAL); |
| if (!fib_table_lookup(table, flp, res)) |
| return 0; |
| |
| table = fib_get_table(net, RT_TABLE_MAIN); |
| if (!fib_table_lookup(table, flp, res)) |
| return 0; |
| return -ENETUNREACH; |
| } |
| |
| #else /* CONFIG_IP_MULTIPLE_TABLES */ |
| extern int __net_init fib4_rules_init(struct net *net); |
| extern void __net_exit fib4_rules_exit(struct net *net); |
| |
| #ifdef CONFIG_NET_CLS_ROUTE |
| extern u32 fib_rules_tclass(struct fib_result *res); |
| #endif |
| |
| extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res); |
| |
| extern struct fib_table *fib_new_table(struct net *net, u32 id); |
| extern struct fib_table *fib_get_table(struct net *net, u32 id); |
| |
| #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| |
| /* Exported by fib_frontend.c */ |
| extern const struct nla_policy rtm_ipv4_policy[]; |
| extern void ip_fib_init(void); |
| extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
| struct net_device *dev, __be32 *spec_dst, |
| u32 *itag, u32 mark); |
| extern void fib_select_default(struct net *net, const struct flowi *flp, |
| struct fib_result *res); |
| |
| /* Exported by fib_semantics.c */ |
| extern int ip_fib_check_default(__be32 gw, struct net_device *dev); |
| extern int fib_sync_down_dev(struct net_device *dev, int force); |
| extern int fib_sync_down_addr(struct net *net, __be32 local); |
| extern int fib_sync_up(struct net_device *dev); |
| extern __be32 __fib_res_prefsrc(struct fib_result *res); |
| extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); |
| |
| /* Exported by fib_{hash|trie}.c */ |
| extern void fib_hash_init(void); |
| extern struct fib_table *fib_hash_table(u32 id); |
| |
| 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 |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| extern int __net_init fib_proc_init(struct net *net); |
| extern void __net_exit fib_proc_exit(struct net *net); |
| #else |
| static inline int fib_proc_init(struct net *net) |
| { |
| return 0; |
| } |
| static inline void fib_proc_exit(struct net *net) |
| { |
| } |
| #endif |
| |
| #endif /* _NET_FIB_H */ |