266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the Forwarding Information Base.
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*
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* Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _NET_IP_FIB_H
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#define _NET_IP_FIB_H
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#include <net/flow.h>
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#include <linux/seq_file.h>
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#include <net/fib_rules.h>
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struct fib_config {
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u8 fc_dst_len;
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u8 fc_tos;
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u8 fc_protocol;
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u8 fc_scope;
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u8 fc_type;
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/* 3 bytes unused */
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u32 fc_table;
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__be32 fc_dst;
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__be32 fc_gw;
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int fc_oif;
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u32 fc_flags;
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u32 fc_priority;
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__be32 fc_prefsrc;
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struct nlattr *fc_mx;
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struct rtnexthop *fc_mp;
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int fc_mx_len;
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int fc_mp_len;
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u32 fc_flow;
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u32 fc_nlflags;
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struct nl_info fc_nlinfo;
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};
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struct fib_info;
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struct fib_nh {
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struct net_device *nh_dev;
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struct hlist_node nh_hash;
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struct fib_info *nh_parent;
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unsigned nh_flags;
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unsigned char nh_scope;
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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int nh_weight;
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int nh_power;
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#endif
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#ifdef CONFIG_NET_CLS_ROUTE
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__u32 nh_tclassid;
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#endif
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int nh_oif;
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__be32 nh_gw;
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};
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/*
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* This structure contains data shared by many of routes.
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*/
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struct fib_info {
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struct hlist_node fib_hash;
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struct hlist_node fib_lhash;
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int fib_treeref;
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atomic_t fib_clntref;
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int fib_dead;
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unsigned fib_flags;
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int fib_protocol;
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__be32 fib_prefsrc;
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u32 fib_priority;
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u32 fib_metrics[RTAX_MAX];
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#define fib_mtu fib_metrics[RTAX_MTU-1]
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#define fib_window fib_metrics[RTAX_WINDOW-1]
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#define fib_rtt fib_metrics[RTAX_RTT-1]
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#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
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int fib_nhs;
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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int fib_power;
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#endif
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struct fib_nh fib_nh[0];
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#define fib_dev fib_nh[0].nh_dev
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};
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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struct fib_rule;
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#endif
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struct fib_result {
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unsigned char prefixlen;
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unsigned char nh_sel;
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unsigned char type;
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unsigned char scope;
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struct fib_info *fi;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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struct fib_rule *r;
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#endif
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};
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struct fib_result_nl {
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__be32 fl_addr; /* To be looked up*/
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u32 fl_mark;
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unsigned char fl_tos;
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unsigned char fl_scope;
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unsigned char tb_id_in;
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unsigned char tb_id; /* Results */
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unsigned char prefixlen;
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unsigned char nh_sel;
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unsigned char type;
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unsigned char scope;
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int err;
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};
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
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#define FIB_RES_RESET(res) ((res).nh_sel = 0)
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#else /* CONFIG_IP_ROUTE_MULTIPATH */
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#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
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#define FIB_RES_RESET(res)
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#endif /* CONFIG_IP_ROUTE_MULTIPATH */
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#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
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#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
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#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
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#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
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struct fib_table {
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struct hlist_node tb_hlist;
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u32 tb_id;
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unsigned tb_stamp;
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int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
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int (*tb_insert)(struct fib_table *, struct fib_config *);
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int (*tb_delete)(struct fib_table *, struct fib_config *);
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int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
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struct netlink_callback *cb);
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int (*tb_flush)(struct fib_table *table);
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void (*tb_select_default)(struct fib_table *table,
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const struct flowi *flp, struct fib_result *res);
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unsigned char tb_data[0];
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};
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#ifndef CONFIG_IP_MULTIPLE_TABLES
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extern struct fib_table *ip_fib_local_table;
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extern struct fib_table *ip_fib_main_table;
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static inline struct fib_table *fib_get_table(u32 id)
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{
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if (id != RT_TABLE_LOCAL)
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return ip_fib_main_table;
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return ip_fib_local_table;
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}
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static inline struct fib_table *fib_new_table(u32 id)
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{
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return fib_get_table(id);
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}
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static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
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{
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if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
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ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
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return -ENETUNREACH;
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return 0;
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}
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static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
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{
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if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
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ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
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}
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#else /* CONFIG_IP_MULTIPLE_TABLES */
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#define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
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#define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
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extern int fib_lookup(struct flowi *flp, struct fib_result *res);
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extern struct fib_table *fib_new_table(u32 id);
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extern struct fib_table *fib_get_table(u32 id);
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extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
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#endif /* CONFIG_IP_MULTIPLE_TABLES */
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/* Exported by fib_frontend.c */
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extern const struct nla_policy rtm_ipv4_policy[];
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extern void ip_fib_init(void);
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extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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struct net_device *dev, __be32 *spec_dst, u32 *itag);
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extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
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struct rtentry;
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/* Exported by fib_semantics.c */
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extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
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extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
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extern int fib_sync_up(struct net_device *dev);
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extern __be32 __fib_res_prefsrc(struct fib_result *res);
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/* Exported by fib_hash.c */
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extern struct fib_table *fib_hash_init(u32 id);
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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extern void __init fib4_rules_init(void);
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#ifdef CONFIG_NET_CLS_ROUTE
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extern u32 fib_rules_tclass(struct fib_result *res);
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#endif
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#endif
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static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
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{
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#ifdef CONFIG_NET_CLS_ROUTE
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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u32 rtag;
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#endif
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*itag = FIB_RES_NH(*res).nh_tclassid<<16;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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rtag = fib_rules_tclass(res);
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if (*itag == 0)
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*itag = (rtag<<16);
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*itag |= (rtag>>16);
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#endif
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#endif
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}
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extern void free_fib_info(struct fib_info *fi);
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static inline void fib_info_put(struct fib_info *fi)
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{
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if (atomic_dec_and_test(&fi->fib_clntref))
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free_fib_info(fi);
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}
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static inline void fib_res_put(struct fib_result *res)
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{
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if (res->fi)
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fib_info_put(res->fi);
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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if (res->r)
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fib_rule_put(res->r);
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#endif
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}
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#ifdef CONFIG_PROC_FS
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extern int fib_proc_init(void);
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extern void fib_proc_exit(void);
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#endif
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#endif /* _NET_FIB_H */
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