Release 4.7 include/net/fib_rules.h

#ifndef __NET_FIB_RULES_H

#define __NET_FIB_RULES_H

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/fib_rules.h>
#include <net/flow.h>
#include <net/rtnetlink.h>


struct fib_rule {
	
struct list_head	list;
	
int			iifindex;
	
int			oifindex;
	
u32			mark;
	
u32			mark_mask;
	
u32			flags;
	
u32			table;
	
u8			action;
	/* 3 bytes hole, try to use */
	
u32			target;
	
__be64			tun_id;
	
struct fib_rule __rcu	*ctarget;
	
struct net		*fr_net;

	
atomic_t		refcnt;
	
u32			pref;
	
int			suppress_ifgroup;
	
int			suppress_prefixlen;
	
char			iifname[IFNAMSIZ];
	
char			oifname[IFNAMSIZ];
	
struct rcu_head		rcu;
};


struct fib_lookup_arg {
	
void			*lookup_ptr;
	
void			*result;
	
struct fib_rule		*rule;
	
int			flags;

#define FIB_LOOKUP_NOREF		1

#define FIB_LOOKUP_IGNORE_LINKSTATE	2
};


struct fib_rules_ops {
	
int			family;
	
struct list_head	list;
	
int			rule_size;
	
int			addr_size;
	
int			unresolved_rules;
	
int			nr_goto_rules;

	
int			(*action)(struct fib_rule *,
					  struct flowi *, int,
					  struct fib_lookup_arg *);
	
bool			(*suppress)(struct fib_rule *,
					    struct fib_lookup_arg *);
	
int			(*match)(struct fib_rule *,
					 struct flowi *, int);
	
int			(*configure)(struct fib_rule *,
					     struct sk_buff *,
					     struct fib_rule_hdr *,
					     struct nlattr **);
	
int			(*delete)(struct fib_rule *);
	
int			(*compare)(struct fib_rule *,
					   struct fib_rule_hdr *,
					   struct nlattr **);
	
int			(*fill)(struct fib_rule *, struct sk_buff *,
					struct fib_rule_hdr *);
	
size_t			(*nlmsg_payload)(struct fib_rule *);

	/* Called after modifications to the rules set, must flush
         * the route cache if one exists. */
	
void			(*flush_cache)(struct fib_rules_ops *ops);

	
int			nlgroup;
	
const struct nla_policy	*policy;
	
struct list_head	rules_list;
	
struct module		*owner;
	
struct net		*fro_net;
	
struct rcu_head		rcu;
};


#define FRA_GENERIC_POLICY \
	[FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
        [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
        [FRA_FWMARK]    = { .type = NLA_U32 }, \
        [FRA_FWMASK]    = { .type = NLA_U32 }, \
        [FRA_TABLE]     = { .type = NLA_U32 }, \
        [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
        [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
        [FRA_GOTO]      = { .type = NLA_U32 }



static inline void fib_rule_get(struct fib_rule *rule)
{
	atomic_inc(&rule->refcnt);
}

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static inline void fib_rule_put(struct fib_rule *rule)
{
	if (atomic_dec_and_test(&rule->refcnt))
		kfree_rcu(rule, rcu);
}

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static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
{
	if (nla[FRA_TABLE])
		return nla_get_u32(nla[FRA_TABLE]);
	return frh->table;
}

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struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
					 struct net *);
void fib_rules_unregister(struct fib_rules_ops *);

int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
		     struct fib_lookup_arg *);
int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
			 u32 flags);
#endif
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tejun heo
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