ip_fib.h 9.3 KB
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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>
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#include <linux/rcupdate.h>
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#include <net/fib_rules.h>
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#include <net/inetpeer.h>
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#include <linux/percpu.h>
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struct fib_config {
	u8			fc_dst_len;
	u8			fc_tos;
	u8			fc_protocol;
	u8			fc_scope;
	u8			fc_type;
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	/* 3 bytes unused */
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	u32			fc_table;
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	__be32			fc_dst;
	__be32			fc_gw;
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	int			fc_oif;
	u32			fc_flags;
	u32			fc_priority;
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	__be32			fc_prefsrc;
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	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;
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	struct nlattr		*fc_encap;
	u16			fc_encap_type;
};
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struct fib_info;
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struct rtable;
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struct fib_nh_exception {
	struct fib_nh_exception __rcu	*fnhe_next;
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	int				fnhe_genid;
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	__be32				fnhe_daddr;
	u32				fnhe_pmtu;
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	__be32				fnhe_gw;
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	unsigned long			fnhe_expires;
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	struct rtable __rcu		*fnhe_rth_input;
	struct rtable __rcu		*fnhe_rth_output;
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	unsigned long			fnhe_stamp;
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	struct rcu_head			rcu;
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};

struct fnhe_hash_bucket {
	struct fib_nh_exception __rcu	*chain;
};

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

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

/*
 * This structure contains data shared by many of routes.
 */

struct fib_info {
	struct hlist_node	fib_hash;
	struct hlist_node	fib_lhash;
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	struct net		*fib_net;
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	int			fib_treeref;
	atomic_t		fib_clntref;
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	unsigned int		fib_flags;
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	unsigned char		fib_dead;
	unsigned char		fib_protocol;
	unsigned char		fib_scope;
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	unsigned char		fib_type;
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	__be32			fib_prefsrc;
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	u32			fib_priority;
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	u32			*fib_metrics;
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#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
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	int			fib_weight;
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#endif
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	struct rcu_head		rcu;
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	struct fib_nh		fib_nh[0];
#define fib_dev		fib_nh[0].nh_dev
};


#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rule;
#endif

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struct fib_table;
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struct fib_result {
	unsigned char	prefixlen;
	unsigned char	nh_sel;
	unsigned char	type;
	unsigned char	scope;
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	u32		tclassid;
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	struct fib_info *fi;
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	struct fib_table *table;
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	struct hlist_head *fa_head;
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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;
	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;      
};
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#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])
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#endif /* CONFIG_IP_ROUTE_MULTIPATH */
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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#define FIB_TABLE_HASHSZ 256
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#else
#define FIB_TABLE_HASHSZ 2
#endif
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__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
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#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)))
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#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)

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#define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \
					 FIB_RES_SADDR(net, res))
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struct fib_table {
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	struct hlist_node	tb_hlist;
	u32			tb_id;
	int			tb_num_default;
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	struct rcu_head		rcu;
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	unsigned long 		*tb_data;
	unsigned long		__data[0];
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};

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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);
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struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
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void fib_table_flush_external(struct fib_table *table);
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void fib_free_table(struct fib_table *tb);
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#ifndef CONFIG_IP_MULTIPLE_TABLES

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#define TABLE_LOCAL_INDEX	(RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
#define TABLE_MAIN_INDEX	(RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1))
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static inline struct fib_table *fib_get_table(struct net *net, u32 id)
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{
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	struct hlist_node *tb_hlist;
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	struct hlist_head *ptr;

	ptr = id == RT_TABLE_LOCAL ?
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		&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
		&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
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	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));

	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
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}

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static inline struct fib_table *fib_new_table(struct net *net, u32 id)
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{
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	return fib_get_table(net, id);
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}

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static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
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			     struct fib_result *res, unsigned int flags)
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{
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	struct fib_table *tb;
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	int err = -ENETUNREACH;
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	rcu_read_lock();

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	tb = fib_get_table(net, RT_TABLE_MAIN);
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	if (tb)
		err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);

	if (err == -EAGAIN)
		err = -ENETUNREACH;
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	rcu_read_unlock();
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	return err;
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}

#else /* CONFIG_IP_MULTIPLE_TABLES */
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int __net_init fib4_rules_init(struct net *net);
void __net_exit fib4_rules_exit(struct net *net);
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struct fib_table *fib_new_table(struct net *net, u32 id);
struct fib_table *fib_get_table(struct net *net, u32 id);
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int __fib_lookup(struct net *net, struct flowi4 *flp,
		 struct fib_result *res, unsigned int flags);
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static inline int fib_lookup(struct net *net, struct flowi4 *flp,
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			     struct fib_result *res, unsigned int flags)
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{
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	struct fib_table *tb;
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	int err = -ENETUNREACH;
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	flags |= FIB_LOOKUP_NOREF;
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	if (net->ipv4.fib_has_custom_rules)
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		return __fib_lookup(net, flp, res, flags);
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	rcu_read_lock();

	res->tclassid = 0;

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	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);
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out:
	if (err == -EAGAIN)
		err = -ENETUNREACH;
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	rcu_read_unlock();

	return err;
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}

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#endif /* CONFIG_IP_MULTIPLE_TABLES */

/* Exported by fib_frontend.c */
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extern const struct nla_policy rtm_ipv4_policy[];
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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);
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void fib_select_default(const struct flowi4 *flp, struct fib_result *res);
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#ifdef CONFIG_IP_ROUTE_CLASSID
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static inline int fib_num_tclassid_users(struct net *net)
{
	return net->ipv4.fib_num_tclassid_users;
}
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#else
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static inline int fib_num_tclassid_users(struct net *net)
{
	return 0;
}
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#endif
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int fib_unmerge(struct net *net);
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void fib_flush_external(struct net *net);
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/* Exported by fib_semantics.c */
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int ip_fib_check_default(__be32 gw, struct net_device *dev);
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int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
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int fib_sync_down_addr(struct net *net, __be32 local);
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int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
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extern u32 fib_multipath_secret __read_mostly;

static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
{
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	return jhash_2words((__force u32)saddr, (__force u32)daddr,
			    fib_multipath_secret) >> 1;
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}

void fib_select_multipath(struct fib_result *res, int hash);
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void fib_select_path(struct net *net, struct fib_result *res,
		     struct flowi4 *fl4, int mp_hash);
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/* Exported by fib_trie.c */
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void fib_trie_init(void);
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struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
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static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
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{
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#ifdef CONFIG_IP_ROUTE_CLASSID
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#ifdef CONFIG_IP_MULTIPLE_TABLES
	u32 rtag;
#endif
	*itag = FIB_RES_NH(*res).nh_tclassid<<16;
#ifdef CONFIG_IP_MULTIPLE_TABLES
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	rtag = res->tclassid;
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	if (*itag == 0)
		*itag = (rtag<<16);
	*itag |= (rtag>>16);
#endif
#endif
}

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void free_fib_info(struct fib_info *fi);
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static inline void fib_info_put(struct fib_info *fi)
{
	if (atomic_dec_and_test(&fi->fib_clntref))
		free_fib_info(fi);
}

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#ifdef CONFIG_PROC_FS
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int __net_init fib_proc_init(struct net *net);
void __net_exit fib_proc_exit(struct net *net);
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#else
static inline int fib_proc_init(struct net *net)
{
	return 0;
}
static inline void fib_proc_exit(struct net *net)
{
}
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#endif

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#endif  /* _NET_FIB_H */