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	__be64			tun_id;
23	struct fib_rule __rcu	*ctarget;
24	struct net		*fr_net;
25
26	atomic_t		refcnt;
27	u32			pref;
28	int			suppress_ifgroup;
29	int			suppress_prefixlen;
30	char			iifname[IFNAMSIZ];
31	char			oifname[IFNAMSIZ];
32	struct rcu_head		rcu;
33};
34
35struct fib_lookup_arg {
36	void			*lookup_ptr;
37	void			*result;
38	struct fib_rule		*rule;
39	int			flags;
40#define FIB_LOOKUP_NOREF		1
41#define FIB_LOOKUP_IGNORE_LINKSTATE	2
42};
43
44struct fib_rules_ops {
45	int			family;
46	struct list_head	list;
47	int			rule_size;
48	int			addr_size;
49	int			unresolved_rules;
50	int			nr_goto_rules;
51
52	int			(*action)(struct fib_rule *,
53					  struct flowi *, int,
54					  struct fib_lookup_arg *);
55	bool			(*suppress)(struct fib_rule *,
56					    struct fib_lookup_arg *);
57	int			(*match)(struct fib_rule *,
58					 struct flowi *, int);
59	int			(*configure)(struct fib_rule *,
60					     struct sk_buff *,
61					     struct fib_rule_hdr *,
62					     struct nlattr **);
63	int			(*delete)(struct fib_rule *);
64	int			(*compare)(struct fib_rule *,
65					   struct fib_rule_hdr *,
66					   struct nlattr **);
67	int			(*fill)(struct fib_rule *, struct sk_buff *,
68					struct fib_rule_hdr *);
69	size_t			(*nlmsg_payload)(struct fib_rule *);
70
71	/* Called after modifications to the rules set, must flush
72	 * the route cache if one exists. */
73	void			(*flush_cache)(struct fib_rules_ops *ops);
74
75	int			nlgroup;
76	const struct nla_policy	*policy;
77	struct list_head	rules_list;
78	struct module		*owner;
79	struct net		*fro_net;
80	struct rcu_head		rcu;
81};
82
83#define FRA_GENERIC_POLICY \
84	[FRA_IIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
85	[FRA_OIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
86	[FRA_PRIORITY]	= { .type = NLA_U32 }, \
87	[FRA_FWMARK]	= { .type = NLA_U32 }, \
88	[FRA_FWMASK]	= { .type = NLA_U32 }, \
89	[FRA_TABLE]     = { .type = NLA_U32 }, \
90	[FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
91	[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
92	[FRA_GOTO]	= { .type = NLA_U32 }
93
94static inline void fib_rule_get(struct fib_rule *rule)
95{
96	atomic_inc(&rule->refcnt);
97}
98
99static inline void fib_rule_put(struct fib_rule *rule)
100{
101	if (atomic_dec_and_test(&rule->refcnt))
102		kfree_rcu(rule, rcu);
103}
104
105static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
106{
107	if (nla[FRA_TABLE])
108		return nla_get_u32(nla[FRA_TABLE]);
109	return frh->table;
110}
111
112struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
113					 struct net *);
114void fib_rules_unregister(struct fib_rules_ops *);
115
116int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
117		     struct fib_lookup_arg *);
118int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
119			 u32 flags);
120#endif
121