1#ifndef __NET_FIB_RULES_H
2#define __NET_FIB_RULES_H
3
4#include <linux/types.h>
5#include <linux/slab.h>
6#include <linux/netdevice.h>
7#include <linux/fib_rules.h>
8#include <net/flow.h>
9#include <net/rtnetlink.h>
10
11struct fib_rule {
12	struct list_head	list;
13	atomic_t		refcnt;
14	int			iifindex;
15	int			oifindex;
16	u32			mark;
17	u32			mark_mask;
18	u32			pref;
19	u32			flags;
20	u32			table;
21	u8			action;
22	u32			target;
23	struct fib_rule __rcu	*ctarget;
24	char			iifname[IFNAMSIZ];
25	char			oifname[IFNAMSIZ];
26	struct rcu_head		rcu;
27	struct net *		fr_net;
28};
29
30struct fib_lookup_arg {
31	void			*lookup_ptr;
32	void			*result;
33	struct fib_rule		*rule;
34	int			flags;
35#define FIB_LOOKUP_NOREF	1
36};
37
38struct fib_rules_ops {
39	int			family;
40	struct list_head	list;
41	int			rule_size;
42	int			addr_size;
43	int			unresolved_rules;
44	int			nr_goto_rules;
45
46	int			(*action)(struct fib_rule *,
47					  struct flowi *, int,
48					  struct fib_lookup_arg *);
49	int			(*match)(struct fib_rule *,
50					 struct flowi *, int);
51	int			(*configure)(struct fib_rule *,
52					     struct sk_buff *,
53					     struct fib_rule_hdr *,
54					     struct nlattr **);
55	int			(*compare)(struct fib_rule *,
56					   struct fib_rule_hdr *,
57					   struct nlattr **);
58	int			(*fill)(struct fib_rule *, struct sk_buff *,
59					struct fib_rule_hdr *);
60	u32			(*default_pref)(struct fib_rules_ops *ops);
61	size_t			(*nlmsg_payload)(struct fib_rule *);
62
63	/* Called after modifications to the rules set, must flush
64	 * the route cache if one exists. */
65	void			(*flush_cache)(struct fib_rules_ops *ops);
66
67	int			nlgroup;
68	const struct nla_policy	*policy;
69	struct list_head	rules_list;
70	struct module		*owner;
71	struct net		*fro_net;
72	struct rcu_head		rcu;
73};
74
75#define FRA_GENERIC_POLICY \
76	[FRA_IIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
77	[FRA_OIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
78	[FRA_PRIORITY]	= { .type = NLA_U32 }, \
79	[FRA_FWMARK]	= { .type = NLA_U32 }, \
80	[FRA_FWMASK]	= { .type = NLA_U32 }, \
81	[FRA_TABLE]     = { .type = NLA_U32 }, \
82	[FRA_GOTO]	= { .type = NLA_U32 }
83
84static inline void fib_rule_get(struct fib_rule *rule)
85{
86	atomic_inc(&rule->refcnt);
87}
88
89static inline void fib_rule_put_rcu(struct rcu_head *head)
90{
91	struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
92	release_net(rule->fr_net);
93	kfree(rule);
94}
95
96static inline void fib_rule_put(struct fib_rule *rule)
97{
98	if (atomic_dec_and_test(&rule->refcnt))
99		call_rcu(&rule->rcu, fib_rule_put_rcu);
100}
101
102static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
103{
104	if (nla[FRA_TABLE])
105		return nla_get_u32(nla[FRA_TABLE]);
106	return frh->table;
107}
108
109extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
110extern void fib_rules_unregister(struct fib_rules_ops *);
111
112extern int			fib_rules_lookup(struct fib_rules_ops *,
113						 struct flowi *, int flags,
114						 struct fib_lookup_arg *);
115extern int			fib_default_rule_add(struct fib_rules_ops *,
116						     u32 pref, u32 table,
117						     u32 flags);
118extern u32			fib_default_rule_pref(struct fib_rules_ops *ops);
119#endif
120