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d878e72e41
linux/include/net/ip_fib.h
Al Viro d878e72e41 [IPV4]: ip_fib_check_default() annotated 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-09-28 18:01:08 -07:00

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/*
* 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_family;
u8 fc_dst_len;
u8 fc_src_len;
u8 fc_tos;
u8 fc_protocol;
u8 fc_scope;
u8 fc_type;
/* 1 byte unused */
u32 fc_table;
__be32 fc_dst;
__be32 fc_src;
__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_mp_alg;
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;
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
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
u32 fib_mp_alg;
#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;
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
__u32 network;
__u32 netmask;
#endif
struct fib_info *fi;
#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rule *r;
#endif
};
struct fib_result_nl {
u32 fl_addr; /* To be looked up*/
u32 fl_fwmark;
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_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)
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
#define FIB_RES_NETWORK(res) ((res).network)
#define FIB_RES_NETMASK(res) ((res).netmask)
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
#define FIB_RES_NETWORK(res) (0)
#define FIB_RES_NETMASK(res) (0)
#endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
struct fib_table {
struct hlist_node tb_hlist;
u32 tb_id;
unsigned tb_stamp;
int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
int (*tb_insert)(struct fib_table *, struct fib_config *);
int (*tb_delete)(struct fib_table *, struct fib_config *);
int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
struct netlink_callback *cb);
int (*tb_flush)(struct fib_table *table);
void (*tb_select_default)(struct fib_table *table,
const struct flowi *flp, struct fib_result *res);
unsigned char tb_data[0];
};
#ifndef CONFIG_IP_MULTIPLE_TABLES
extern struct fib_table *ip_fib_local_table;
extern struct fib_table *ip_fib_main_table;
static inline struct fib_table *fib_get_table(u32 id)
{
if (id != RT_TABLE_LOCAL)
return ip_fib_main_table;
return ip_fib_local_table;
}
static inline struct fib_table *fib_new_table(u32 id)
{
return fib_get_table(id);
}
static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
{
if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
return -ENETUNREACH;
return 0;
}
static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
{
if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
}
#else /* CONFIG_IP_MULTIPLE_TABLES */
#define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
#define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
extern int fib_lookup(struct flowi *flp, struct fib_result *res);
extern struct fib_table *fib_new_table(u32 id);
extern struct fib_table *fib_get_table(u32 id);
extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
#endif /* CONFIG_IP_MULTIPLE_TABLES */
/* Exported by fib_frontend.c */
extern struct nla_policy rtm_ipv4_policy[];
extern void ip_fib_init(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(__be32 src, __be32 dst, u8 tos, int oif,
struct net_device *dev, __be32 *spec_dst, u32 *itag);
extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
struct rtentry;
/* Exported by fib_semantics.c */
extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
extern int fib_sync_down(u32 local, struct net_device *dev, int force);
extern int fib_sync_up(struct net_device *dev);
extern __be32 __fib_res_prefsrc(struct fib_result *res);
/* Exported by fib_hash.c */
extern struct fib_table *fib_hash_init(u32 id);
#ifdef CONFIG_IP_MULTIPLE_TABLES
extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb);
extern void __init fib4_rules_init(void);
#ifdef CONFIG_NET_CLS_ROUTE
extern u32 fib_rules_tclass(struct fib_result *res);
#endif
#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
}
#ifdef CONFIG_PROC_FS
extern int fib_proc_init(void);
extern void fib_proc_exit(void);
#endif
#endif /* _NET_FIB_H */
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