ip6_fib.h 6.72 KB
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/*
 *	Linux INET6 implementation 
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>	
 *
 *	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 _IP6_FIB_H
#define _IP6_FIB_H

#include <linux/ipv6_route.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
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#include <net/dst.h>
#include <net/flow.h>
#include <net/netlink.h>
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#include <net/inetpeer.h>
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_HASHSZ 256
#else
#define FIB6_TABLE_HASHSZ 1
#endif

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struct rt6_info;

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struct fib6_config {
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	u32		fc_table;
	u32		fc_metric;
	int		fc_dst_len;
	int		fc_src_len;
	int		fc_ifindex;
	u32		fc_flags;
	u32		fc_protocol;
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	u32		fc_type;	/* only 8 bits are used */
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	struct in6_addr	fc_dst;
	struct in6_addr	fc_src;
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	struct in6_addr	fc_prefsrc;
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	struct in6_addr	fc_gateway;

	unsigned long	fc_expires;
	struct nlattr	*fc_mx;
	int		fc_mx_len;
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	int		fc_mp_len;
	struct nlattr	*fc_mp;
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	struct nl_info	fc_nlinfo;
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	struct nlattr	*fc_encap;
	u16		fc_encap_type;
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};

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struct fib6_node {
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	struct fib6_node	*parent;
	struct fib6_node	*left;
	struct fib6_node	*right;
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#ifdef CONFIG_IPV6_SUBTREES
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	struct fib6_node	*subtree;
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#endif
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	struct rt6_info		*leaf;

	__u16			fn_bit;		/* bit key */
	__u16			fn_flags;
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	int			fn_sernum;
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	struct rt6_info		*rr_ptr;
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};

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#ifndef CONFIG_IPV6_SUBTREES
#define FIB6_SUBTREE(fn)	NULL
#else
#define FIB6_SUBTREE(fn)	((fn)->subtree)
#endif
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struct mx6_config {
	const u32 *mx;
	DECLARE_BITMAP(mx_valid, RTAX_MAX);
};

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/*
 *	routing information
 *
 */

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struct rt6key {
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	struct in6_addr	addr;
	int		plen;
};

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struct fib6_table;

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struct rt6_info {
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	struct dst_entry		dst;
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	/*
	 * Tail elements of dst_entry (__refcnt etc.)
	 * and these elements (rarely used in hot path) are in
	 * the same cache line.
	 */
	struct fib6_table		*rt6i_table;
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	struct fib6_node		*rt6i_node;

	struct in6_addr			rt6i_gateway;

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	/* Multipath routes:
	 * siblings is a list of rt6_info that have the the same metric/weight,
	 * destination, but not the same gateway. nsiblings is just a cache
	 * to speed up lookup.
	 */
	struct list_head		rt6i_siblings;
	unsigned int			rt6i_nsiblings;

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	atomic_t			rt6i_ref;
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	/* These are in a separate cache line. */
	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;
	u32				rt6i_flags;
	struct rt6key			rt6i_src;
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	struct rt6key			rt6i_prefsrc;
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	struct list_head		rt6i_uncached;
	struct uncached_list		*rt6i_uncached_list;

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	struct inet6_dev		*rt6i_idev;
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	struct rt6_info * __percpu	*rt6i_pcpu;
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	u32				rt6i_metric;
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	u32				rt6i_pmtu;
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	/* more non-fragment space at head required */
	unsigned short			rt6i_nfheader_len;
	u8				rt6i_protocol;
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};

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static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
{
	return ((struct rt6_info *)dst)->rt6i_idev;
}

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static inline void rt6_clean_expires(struct rt6_info *rt)
{
	rt->rt6i_flags &= ~RTF_EXPIRES;
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	rt->dst.expires = 0;
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}

static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
{
	rt->dst.expires = expires;
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	rt->rt6i_flags |= RTF_EXPIRES;
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}

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static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
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{
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	struct rt6_info *rt;

	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
	     rt = (struct rt6_info *)rt->dst.from);
	if (rt && rt != rt0)
		rt0->dst.expires = rt->dst.expires;

	dst_set_expires(&rt0->dst, timeout);
	rt0->rt6i_flags |= RTF_EXPIRES;
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}
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static inline u32 rt6_get_cookie(const struct rt6_info *rt)
{
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	if (rt->rt6i_flags & RTF_PCPU ||
	    (unlikely(rt->dst.flags & DST_NOCACHE) && rt->dst.from))
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		rt = (struct rt6_info *)(rt->dst.from);

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	return rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
}
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static inline void ip6_rt_put(struct rt6_info *rt)
{
	/* dst_release() accepts a NULL parameter.
	 * We rely on dst being first structure in struct rt6_info
	 */
	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
	dst_release(&rt->dst);
}

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enum fib6_walk_state {
#ifdef CONFIG_IPV6_SUBTREES
	FWS_S,
#endif
	FWS_L,
	FWS_R,
	FWS_C,
	FWS_U
};

struct fib6_walker {
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	struct list_head lh;
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	struct fib6_node *root, *node;
	struct rt6_info *leaf;
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	enum fib6_walk_state state;
	bool prune;
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	unsigned int skip;
	unsigned int count;
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	int (*func)(struct fib6_walker *);
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	void *args;
};

struct rt6_statistics {
	__u32		fib_nodes;
	__u32		fib_route_nodes;
	__u32		fib_rt_alloc;		/* permanent routes	*/
	__u32		fib_rt_entries;		/* rt entries in table	*/
	__u32		fib_rt_cache;		/* cache routes		*/
	__u32		fib_discarded_routes;
};

#define RTN_TL_ROOT	0x0001
#define RTN_ROOT	0x0002		/* tree root node		*/
#define RTN_RTINFO	0x0004		/* node with valid routing info	*/

/*
 *	priority levels (or metrics)
 *
 */


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struct fib6_table {
	struct hlist_node	tb6_hlist;
	u32			tb6_id;
	rwlock_t		tb6_lock;
	struct fib6_node	tb6_root;
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	struct inet_peer_base	tb6_peers;
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};

#define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
#define RT6_TABLE_MAIN		RT_TABLE_MAIN
#define RT6_TABLE_DFLT		RT6_TABLE_MAIN
#define RT6_TABLE_INFO		RT6_TABLE_MAIN
#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_MIN		1
#define FIB6_TABLE_MAX		RT_TABLE_MAX
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#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
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#else
#define FIB6_TABLE_MIN		RT_TABLE_MAIN
#define FIB6_TABLE_MAX		FIB6_TABLE_MIN
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#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
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#endif

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typedef struct rt6_info *(*pol_lookup_t)(struct net *,
					 struct fib6_table *,
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					 struct flowi6 *, int);
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/*
 *	exported functions
 */

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struct fib6_table *fib6_get_table(struct net *net, u32 id);
struct fib6_table *fib6_new_table(struct net *net, u32 id);
struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
				   int flags, pol_lookup_t lookup);
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struct fib6_node *fib6_lookup(struct fib6_node *root,
			      const struct in6_addr *daddr,
			      const struct in6_addr *saddr);
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struct fib6_node *fib6_locate(struct fib6_node *root,
			      const struct in6_addr *daddr, int dst_len,
			      const struct in6_addr *saddr, int src_len);
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void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
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		    void *arg);
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int fib6_add(struct fib6_node *root, struct rt6_info *rt,
	     struct nl_info *info, struct mx6_config *mxc);
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int fib6_del(struct rt6_info *rt, struct nl_info *info);
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void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
		     unsigned int flags);
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void fib6_run_gc(unsigned long expires, struct net *net, bool force);
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void fib6_gc_cleanup(void);
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int fib6_init(void);
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int ipv6_route_open(struct inode *inode, struct file *file);

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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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int fib6_rules_init(void);
void fib6_rules_cleanup(void);
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#else
static inline int               fib6_rules_init(void)
{
	return 0;
}
static inline void              fib6_rules_cleanup(void)
{
	return ;
}
#endif
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#endif