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
11 struct 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
30 struct 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
38 struct 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
fib_rule_get(struct fib_rule * rule)84 static inline void fib_rule_get(struct fib_rule *rule)
85 {
86 atomic_inc(&rule->refcnt);
87 }
88
fib_rule_put_rcu(struct rcu_head * head)89 static 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
fib_rule_put(struct fib_rule * rule)96 static 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
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)102 static 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
109 extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
110 extern void fib_rules_unregister(struct fib_rules_ops *);
111
112 extern int fib_rules_lookup(struct fib_rules_ops *,
113 struct flowi *, int flags,
114 struct fib_lookup_arg *);
115 extern int fib_default_rule_add(struct fib_rules_ops *,
116 u32 pref, u32 table,
117 u32 flags);
118 extern u32 fib_default_rule_pref(struct fib_rules_ops *ops);
119 #endif
120