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	int			iifindex;
14	int			oifindex;
15	u32			mark;
16	u32			mark_mask;
17	u32			flags;
18	u32			table;
19	u8			action;
20	/* 3 bytes hole, try to use */
21	u32			target;
22	struct fib_rule __rcu	*ctarget;
23	struct net		*fr_net;
24
25	atomic_t		refcnt;
26	u32			pref;
27	int			suppress_ifgroup;
28	int			suppress_prefixlen;
29	char			iifname[IFNAMSIZ];
30	char			oifname[IFNAMSIZ];
31	struct rcu_head		rcu;
32};
33
34struct fib_lookup_arg {
35	void			*lookup_ptr;
36	void			*result;
37	struct fib_rule		*rule;
38	int			flags;
39#define FIB_LOOKUP_NOREF	1
40};
41
42struct fib_rules_ops {
43	int			family;
44	struct list_head	list;
45	int			rule_size;
46	int			addr_size;
47	int			unresolved_rules;
48	int			nr_goto_rules;
49
50	int			(*action)(struct fib_rule *,
51					  struct flowi *, int,
52					  struct fib_lookup_arg *);
53	bool			(*suppress)(struct fib_rule *,
54					    struct fib_lookup_arg *);
55	int			(*match)(struct fib_rule *,
56					 struct flowi *, int);
57	int			(*configure)(struct fib_rule *,
58					     struct sk_buff *,
59					     struct fib_rule_hdr *,
60					     struct nlattr **);
61	int			(*delete)(struct fib_rule *);
62	int			(*compare)(struct fib_rule *,
63					   struct fib_rule_hdr *,
64					   struct nlattr **);
65	int			(*fill)(struct fib_rule *, struct sk_buff *,
66					struct fib_rule_hdr *);
67	u32			(*default_pref)(struct fib_rules_ops *ops);
68	size_t			(*nlmsg_payload)(struct fib_rule *);
69
70	/* Called after modifications to the rules set, must flush
71	 * the route cache if one exists. */
72	void			(*flush_cache)(struct fib_rules_ops *ops);
73
74	int			nlgroup;
75	const struct nla_policy	*policy;
76	struct list_head	rules_list;
77	struct module		*owner;
78	struct net		*fro_net;
79	struct rcu_head		rcu;
80};
81
82#define FRA_GENERIC_POLICY \
83	[FRA_IIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
84	[FRA_OIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
85	[FRA_PRIORITY]	= { .type = NLA_U32 }, \
86	[FRA_FWMARK]	= { .type = NLA_U32 }, \
87	[FRA_FWMASK]	= { .type = NLA_U32 }, \
88	[FRA_TABLE]     = { .type = NLA_U32 }, \
89	[FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
90	[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
91	[FRA_GOTO]	= { .type = NLA_U32 }
92
93static inline void fib_rule_get(struct fib_rule *rule)
94{
95	atomic_inc(&rule->refcnt);
96}
97
98static inline void fib_rule_put(struct fib_rule *rule)
99{
100	if (atomic_dec_and_test(&rule->refcnt))
101		kfree_rcu(rule, rcu);
102}
103
104static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
105{
106	if (nla[FRA_TABLE])
107		return nla_get_u32(nla[FRA_TABLE]);
108	return frh->table;
109}
110
111struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
112					 struct net *);
113void fib_rules_unregister(struct fib_rules_ops *);
114
115int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
116		     struct fib_lookup_arg *);
117int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
118			 u32 flags);
119u32 fib_default_rule_pref(struct fib_rules_ops *ops);
120#endif
121