aboutsummaryrefslogtreecommitdiff
path: root/include/net/fib_rules.h
blob: e584de16e4c3629ccebef06d000b47166e5cc65d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
#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;
	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
};

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 **);
	void			(*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 *);
	u32			(*default_pref)(struct fib_rules_ops *ops);
	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);
}

static inline void fib_rule_put_rcu(struct rcu_head *head)
{
	struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
	release_net(rule->fr_net);
	kfree(rule);
}

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

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;
}

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);
u32 fib_default_rule_pref(struct fib_rules_ops *ops);
#endif