include/net/ip

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This source file includes following definitions.
fib_get_table
fib_new_table
fib_lookup
fib_lookup
fib_num_tclassid_users
fib_num_tclassid_users
fib_combine_itag
fib_info_put
fib_proc_init
fib_proc_exit
/*
 * 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 <linux/rcupdate.h>
#include <net/fib_rules.h>
#include <net/inetpeer.h>
#include <linux/percpu.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 rtable;

struct fib_nh_exception {
        struct fib_nh_exception __rcu   *fnhe_next;
        int                             fnhe_genid;
        __be32                          fnhe_daddr;
        u32                             fnhe_pmtu;
        __be32                          fnhe_gw;
        unsigned long                   fnhe_expires;
        struct rtable __rcu             *fnhe_rth_input;
        struct rtable __rcu             *fnhe_rth_output;
        unsigned long                   fnhe_stamp;
};

struct fnhe_hash_bucket {
        struct fib_nh_exception __rcu   *chain;
};

#define FNHE_HASH_SHIFT         11
#define FNHE_HASH_SIZE          (1 << FNHE_HASH_SHIFT)
#define FNHE_RECLAIM_DEPTH      5

struct fib_nh {
        struct net_device       *nh_dev;
        struct hlist_node       nh_hash;
        struct fib_info         *nh_parent;
        unsigned int            nh_flags;
        unsigned char           nh_scope;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
        int                     nh_weight;
        int                     nh_power;
#endif
#ifdef CONFIG_IP_ROUTE_CLASSID
        __u32                   nh_tclassid;
#endif
        int                     nh_oif;
        __be32                  nh_gw;
        __be32                  nh_saddr;
        int                     nh_saddr_genid;
        struct rtable __rcu * __percpu *nh_pcpu_rth_output;
        struct rtable __rcu     *nh_rth_input;
        struct fnhe_hash_bucket __rcu *nh_exceptions;
};

/*
 * 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;
        unsigned int            fib_flags;
        unsigned char           fib_dead;
        unsigned char           fib_protocol;
        unsigned char           fib_scope;
        unsigned char           fib_type;
        __be32                  fib_prefsrc;
        u32                     fib_priority;
        u32                     *fib_metrics;
#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 rcu_head         rcu;
        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_table;
struct fib_result {
        unsigned char   prefixlen;
        unsigned char   nh_sel;
        unsigned char   type;
        unsigned char   scope;
        u32             tclassid;
        struct fib_info *fi;
        struct fib_table *table;
        struct list_head *fa_head;
};

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])
#else /* CONFIG_IP_ROUTE_MULTIPATH */
#define FIB_RES_NH(res)         ((res).fi->fib_nh[0])
#endif /* CONFIG_IP_ROUTE_MULTIPATH */

#ifdef CONFIG_IP_MULTIPLE_TABLES
#define FIB_TABLE_HASHSZ 256
#else
#define FIB_TABLE_HASHSZ 2
#endif

__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);

#define FIB_RES_SADDR(net, res)                         \
        ((FIB_RES_NH(res).nh_saddr_genid ==             \
          atomic_read(&(net)->ipv4.dev_addr_genid)) ?   \
         FIB_RES_NH(res).nh_saddr :                     \
         fib_info_update_nh_saddr((net), &FIB_RES_NH(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)

#define FIB_RES_PREFSRC(net, res)       ((res).fi->fib_prefsrc ? : \
                                         FIB_RES_SADDR(net, res))

struct fib_table {
        struct hlist_node       tb_hlist;
        u32                     tb_id;
        int                     tb_default;
        int                     tb_num_default;
        unsigned long           tb_data[0];
};

int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
                     struct fib_result *res, int fib_flags);
int fib_table_insert(struct fib_table *, struct fib_config *);
int fib_table_delete(struct fib_table *, struct fib_config *);
int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
                   struct netlink_callback *cb);
int fib_table_flush(struct fib_table *table);
void fib_free_table(struct fib_table *tb);



#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 flowi4 *flp,
                             struct fib_result *res)
{
        struct fib_table *table;

        table = fib_get_table(net, RT_TABLE_LOCAL);
        if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
                return 0;

        table = fib_get_table(net, RT_TABLE_MAIN);
        if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
                return 0;
        return -ENETUNREACH;
}

#else /* CONFIG_IP_MULTIPLE_TABLES */
int __net_init fib4_rules_init(struct net *net);
void __net_exit fib4_rules_exit(struct net *net);

struct fib_table *fib_new_table(struct net *net, u32 id);
struct fib_table *fib_get_table(struct net *net, u32 id);

int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);

static inline int fib_lookup(struct net *net, struct flowi4 *flp,
                             struct fib_result *res)
{
        if (!net->ipv4.fib_has_custom_rules) {
                res->tclassid = 0;
                if (net->ipv4.fib_local &&
                    !fib_table_lookup(net->ipv4.fib_local, flp, res,
                                      FIB_LOOKUP_NOREF))
                        return 0;
                if (net->ipv4.fib_main &&
                    !fib_table_lookup(net->ipv4.fib_main, flp, res,
                                      FIB_LOOKUP_NOREF))
                        return 0;
                if (net->ipv4.fib_default &&
                    !fib_table_lookup(net->ipv4.fib_default, flp, res,
                                      FIB_LOOKUP_NOREF))
                        return 0;
                return -ENETUNREACH;
        }
        return __fib_lookup(net, flp, res);
}

#endif /* CONFIG_IP_MULTIPLE_TABLES */

/* Exported by fib_frontend.c */
extern const struct nla_policy rtm_ipv4_policy[];
void ip_fib_init(void);
__be32 fib_compute_spec_dst(struct sk_buff *skb);
int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
                        u8 tos, int oif, struct net_device *dev,
                        struct in_device *idev, u32 *itag);
void fib_select_default(struct fib_result *res);
#ifdef CONFIG_IP_ROUTE_CLASSID
static inline int fib_num_tclassid_users(struct net *net)
{
        return net->ipv4.fib_num_tclassid_users;
}
#else
static inline int fib_num_tclassid_users(struct net *net)
{
        return 0;
}
#endif

/* Exported by fib_semantics.c */
int ip_fib_check_default(__be32 gw, struct net_device *dev);
int fib_sync_down_dev(struct net_device *dev, int force);
int fib_sync_down_addr(struct net *net, __be32 local);
int fib_sync_up(struct net_device *dev);
void fib_select_multipath(struct fib_result *res);

/* Exported by fib_trie.c */
void fib_trie_init(void);
struct fib_table *fib_trie_table(u32 id);

static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
{
#ifdef CONFIG_IP_ROUTE_CLASSID
#ifdef CONFIG_IP_MULTIPLE_TABLES
        u32 rtag;
#endif
        *itag = FIB_RES_NH(*res).nh_tclassid<<16;
#ifdef CONFIG_IP_MULTIPLE_TABLES
        rtag = res->tclassid;
        if (*itag == 0)
                *itag = (rtag<<16);
        *itag |= (rtag>>16);
#endif
#endif
}

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);
}

#ifdef CONFIG_PROC_FS
int __net_init fib_proc_init(struct net *net);
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 */
/* [<][>][^][v][top][bottom][index][help] */
root/include/net/ip_fib.h

DEFINITIONS
