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alistair23-linux/include/net/ip_fib.h
Arnaldo Carvalho de Melo 14c850212e [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h 
To help in reducing the number of include dependencies, several files were
touched as they were getting needed headers indirectly for stuff they use.

Thanks also to Alan Menegotto for pointing out that net/dccp/proto.c had
linux/dccp.h include twice.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:11:21 -08:00

306 lines
8.2 KiB
C
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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 <linux/config.h>
#include <net/flow.h>
#include <linux/seq_file.h>
/* WARNING: The ordering of these elements must match ordering
* of RTA_* rtnetlink attribute numbers.
*/
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;
u32 *rta_flow;
struct rta_cacheinfo *rta_ci;
struct rta_session *rta_sess;
u32 *rta_mp_alg;
};
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;
u32 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;
u32 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 {
unsigned char 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 *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);
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(int id)
{
if (id != RT_TABLE_LOCAL)
return ip_fib_main_table;
return ip_fib_local_table;
}
static inline struct fib_table *fib_new_table(int 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_tables[RT_TABLE_LOCAL])
#define ip_fib_main_table (fib_tables[RT_TABLE_MAIN])
extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
extern int fib_lookup(const struct flowi *flp, 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 flowi *flp, struct fib_result *res);
#endif /* CONFIG_IP_MULTIPLE_TABLES */
/* Exported by fib_frontend.c */
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(u32 src, u32 dst, u8 tos, int oif,
struct net_device *dev, u32 *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(u32 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 int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
struct kern_rta *rta, struct rtentry *r);
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);
#ifdef CONFIG_NET_CLS_ROUTE
extern u32 fib_rules_tclass(struct fib_result *res);
#endif
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
}
#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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