471 lines
12 KiB
C
471 lines
12 KiB
C
/*
|
|
* 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_notifier.h>
|
|
#include <net/fib_rules.h>
|
|
#include <net/inetpeer.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/refcount.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 nlattr *fc_encap;
|
|
u16 fc_encap_type;
|
|
};
|
|
|
|
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;
|
|
bool fnhe_mtu_locked;
|
|
__be32 fnhe_gw;
|
|
unsigned long fnhe_expires;
|
|
struct rtable __rcu *fnhe_rth_input;
|
|
struct rtable __rcu *fnhe_rth_output;
|
|
unsigned long fnhe_stamp;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
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;
|
|
atomic_t nh_upper_bound;
|
|
#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;
|
|
struct lwtunnel_state *nh_lwtstate;
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
refcount_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_tb_id;
|
|
u32 fib_priority;
|
|
struct dst_metrics *fib_metrics;
|
|
#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
|
|
#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
|
|
#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
|
|
#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
|
|
int fib_nhs;
|
|
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 {
|
|
__be32 prefix;
|
|
unsigned char prefixlen;
|
|
unsigned char nh_sel;
|
|
unsigned char type;
|
|
unsigned char scope;
|
|
u32 tclassid;
|
|
struct fib_info *fi;
|
|
struct fib_table *table;
|
|
struct hlist_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_entry_notifier_info {
|
|
struct fib_notifier_info info; /* must be first */
|
|
u32 dst;
|
|
int dst_len;
|
|
struct fib_info *fi;
|
|
u8 tos;
|
|
u8 type;
|
|
u32 tb_id;
|
|
};
|
|
|
|
struct fib_nh_notifier_info {
|
|
struct fib_notifier_info info; /* must be first */
|
|
struct fib_nh *fib_nh;
|
|
};
|
|
|
|
int call_fib4_notifier(struct notifier_block *nb, struct net *net,
|
|
enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
|
|
int __net_init fib4_notifier_init(struct net *net);
|
|
void __net_exit fib4_notifier_exit(struct net *net);
|
|
|
|
void fib_notify(struct net *net, struct notifier_block *nb);
|
|
|
|
struct fib_table {
|
|
struct hlist_node tb_hlist;
|
|
u32 tb_id;
|
|
int tb_num_default;
|
|
struct rcu_head rcu;
|
|
unsigned long *tb_data;
|
|
unsigned long __data[0];
|
|
};
|
|
|
|
struct fib_dump_filter {
|
|
u32 table_id;
|
|
/* filter_set is an optimization that an entry is set */
|
|
bool filter_set;
|
|
bool dump_all_families;
|
|
unsigned char protocol;
|
|
unsigned char rt_type;
|
|
unsigned int flags;
|
|
struct net_device *dev;
|
|
};
|
|
|
|
int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
|
|
struct fib_result *res, int fib_flags);
|
|
int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
|
|
struct netlink_ext_ack *extack);
|
|
int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
|
|
struct netlink_ext_ack *extack);
|
|
int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
|
|
struct netlink_callback *cb, struct fib_dump_filter *filter);
|
|
int fib_table_flush(struct net *net, struct fib_table *table);
|
|
struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
|
|
void fib_table_flush_external(struct fib_table *table);
|
|
void fib_free_table(struct fib_table *tb);
|
|
|
|
#ifndef CONFIG_IP_MULTIPLE_TABLES
|
|
|
|
#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
|
|
#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
|
|
|
|
static inline struct fib_table *fib_get_table(struct net *net, u32 id)
|
|
{
|
|
struct hlist_node *tb_hlist;
|
|
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];
|
|
|
|
tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
|
|
|
|
return hlist_entry(tb_hlist, 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, unsigned int flags)
|
|
{
|
|
struct fib_table *tb;
|
|
int err = -ENETUNREACH;
|
|
|
|
rcu_read_lock();
|
|
|
|
tb = fib_get_table(net, RT_TABLE_MAIN);
|
|
if (tb)
|
|
err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
|
|
|
|
if (err == -EAGAIN)
|
|
err = -ENETUNREACH;
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline bool fib4_rule_default(const struct fib_rule *rule)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int fib4_rules_seq_read(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool fib4_rules_early_flow_dissect(struct net *net,
|
|
struct sk_buff *skb,
|
|
struct flowi4 *fl4,
|
|
struct flow_keys *flkeys)
|
|
{
|
|
return false;
|
|
}
|
|
#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, unsigned int flags);
|
|
|
|
static inline int fib_lookup(struct net *net, struct flowi4 *flp,
|
|
struct fib_result *res, unsigned int flags)
|
|
{
|
|
struct fib_table *tb;
|
|
int err = -ENETUNREACH;
|
|
|
|
flags |= FIB_LOOKUP_NOREF;
|
|
if (net->ipv4.fib_has_custom_rules)
|
|
return __fib_lookup(net, flp, res, flags);
|
|
|
|
rcu_read_lock();
|
|
|
|
res->tclassid = 0;
|
|
|
|
tb = rcu_dereference_rtnl(net->ipv4.fib_main);
|
|
if (tb)
|
|
err = fib_table_lookup(tb, flp, res, flags);
|
|
|
|
if (!err)
|
|
goto out;
|
|
|
|
tb = rcu_dereference_rtnl(net->ipv4.fib_default);
|
|
if (tb)
|
|
err = fib_table_lookup(tb, flp, res, flags);
|
|
|
|
out:
|
|
if (err == -EAGAIN)
|
|
err = -ENETUNREACH;
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
bool fib4_rule_default(const struct fib_rule *rule);
|
|
int fib4_rules_dump(struct net *net, struct notifier_block *nb);
|
|
unsigned int fib4_rules_seq_read(struct net *net);
|
|
|
|
static inline bool fib4_rules_early_flow_dissect(struct net *net,
|
|
struct sk_buff *skb,
|
|
struct flowi4 *fl4,
|
|
struct flow_keys *flkeys)
|
|
{
|
|
unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
|
|
|
|
if (!net->ipv4.fib_rules_require_fldissect)
|
|
return false;
|
|
|
|
skb_flow_dissect_flow_keys(skb, flkeys, flag);
|
|
fl4->fl4_sport = flkeys->ports.src;
|
|
fl4->fl4_dport = flkeys->ports.dst;
|
|
fl4->flowi4_proto = flkeys->basic.ip_proto;
|
|
|
|
return true;
|
|
}
|
|
|
|
#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);
|
|
bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
|
|
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);
|
|
#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
|
|
int fib_unmerge(struct net *net);
|
|
|
|
/* 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, unsigned long event, bool force);
|
|
int fib_sync_down_addr(struct net_device *dev, __be32 local);
|
|
int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
|
|
void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
|
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
|
|
const struct sk_buff *skb, struct flow_keys *flkeys);
|
|
#endif
|
|
void fib_select_multipath(struct fib_result *res, int hash);
|
|
void fib_select_path(struct net *net, struct fib_result *res,
|
|
struct flowi4 *fl4, const struct sk_buff *skb);
|
|
|
|
/* Exported by fib_trie.c */
|
|
void fib_trie_init(void);
|
|
struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
|
|
|
|
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_hold(struct fib_info *fi)
|
|
{
|
|
refcount_inc(&fi->fib_clntref);
|
|
}
|
|
|
|
static inline void fib_info_put(struct fib_info *fi)
|
|
{
|
|
if (refcount_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
|
|
|
|
u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
|
|
|
|
int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
|
|
struct fib_dump_filter *filter,
|
|
struct netlink_callback *cb);
|
|
#endif /* _NET_FIB_H */
|