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 u8 l3mdev;
21
22 u32 target;
23 __be64 tun_id;
24 struct fib_rule __rcu *ctarget;
25 struct net *fr_net;
26
27 atomic_t refcnt;
28 u32 pref;
29 int suppress_ifgroup;
30 int suppress_prefixlen;
31 char iifname[IFNAMSIZ];
32 char oifname[IFNAMSIZ];
33 struct rcu_head rcu;
34};
35
36struct fib_lookup_arg {
37 void *lookup_ptr;
38 void *result;
39 struct fib_rule *rule;
40 u32 table;
41 int flags;
42#define FIB_LOOKUP_NOREF 1
43#define FIB_LOOKUP_IGNORE_LINKSTATE 2
44};
45
46struct fib_rules_ops {
47 int family;
48 struct list_head list;
49 int rule_size;
50 int addr_size;
51 int unresolved_rules;
52 int nr_goto_rules;
53
54 int (*action)(struct fib_rule *,
55 struct flowi *, int,
56 struct fib_lookup_arg *);
57 bool (*suppress)(struct fib_rule *,
58 struct fib_lookup_arg *);
59 int (*match)(struct fib_rule *,
60 struct flowi *, int);
61 int (*configure)(struct fib_rule *,
62 struct sk_buff *,
63 struct fib_rule_hdr *,
64 struct nlattr **);
65 int (*delete)(struct fib_rule *);
66 int (*compare)(struct fib_rule *,
67 struct fib_rule_hdr *,
68 struct nlattr **);
69 int (*fill)(struct fib_rule *, struct sk_buff *,
70 struct fib_rule_hdr *);
71 size_t (*nlmsg_payload)(struct fib_rule *);
72
73
74
75 void (*flush_cache)(struct fib_rules_ops *ops);
76
77 int nlgroup;
78 const struct nla_policy *policy;
79 struct list_head rules_list;
80 struct module *owner;
81 struct net *fro_net;
82 struct rcu_head rcu;
83};
84
85#define FRA_GENERIC_POLICY \
86 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
87 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
88 [FRA_PRIORITY] = { .type = NLA_U32 }, \
89 [FRA_FWMARK] = { .type = NLA_U32 }, \
90 [FRA_FWMASK] = { .type = NLA_U32 }, \
91 [FRA_TABLE] = { .type = NLA_U32 }, \
92 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
93 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
94 [FRA_GOTO] = { .type = NLA_U32 }, \
95 [FRA_L3MDEV] = { .type = NLA_U8 }
96
97static inline void fib_rule_get(struct fib_rule *rule)
98{
99 atomic_inc(&rule->refcnt);
100}
101
102static inline void fib_rule_put(struct fib_rule *rule)
103{
104 if (atomic_dec_and_test(&rule->refcnt))
105 kfree_rcu(rule, rcu);
106}
107
108#ifdef CONFIG_NET_L3_MASTER_DEV
109static inline u32 fib_rule_get_table(struct fib_rule *rule,
110 struct fib_lookup_arg *arg)
111{
112 return rule->l3mdev ? arg->table : rule->table;
113}
114#else
115static inline u32 fib_rule_get_table(struct fib_rule *rule,
116 struct fib_lookup_arg *arg)
117{
118 return rule->table;
119}
120#endif
121
122static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
123{
124 if (nla[FRA_TABLE])
125 return nla_get_u32(nla[FRA_TABLE]);
126 return frh->table;
127}
128
129struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
130 struct net *);
131void fib_rules_unregister(struct fib_rules_ops *);
132
133int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
134 struct fib_lookup_arg *);
135int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
136 u32 flags);
137
138int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh);
139int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh);
140#endif
141
