d4e875a58f8b5d99dcf5af95de9e5a103d818b90
[linux-2.6.git] / include / net / fib_rules.h
1 #ifndef __NET_FIB_RULES_H
2 #define __NET_FIB_RULES_H
3
4 #include <linux/types.h>
5 #include <linux/netdevice.h>
6 #include <linux/fib_rules.h>
7 #include <net/flow.h>
8 #include <net/rtnetlink.h>
9
10 struct fib_rule {
11         struct list_head        list;
12         atomic_t                refcnt;
13         int                     iifindex;
14         int                     oifindex;
15         u32                     mark;
16         u32                     mark_mask;
17         u32                     pref;
18         u32                     flags;
19         u32                     table;
20         u8                      action;
21         u32                     target;
22         struct fib_rule *       ctarget;
23         char                    iifname[IFNAMSIZ];
24         char                    oifname[IFNAMSIZ];
25         struct rcu_head         rcu;
26         struct net *            fr_net;
27 };
28
29 struct fib_lookup_arg {
30         void                    *lookup_ptr;
31         void                    *result;
32         struct fib_rule         *rule;
33 };
34
35 struct fib_rules_ops {
36         int                     family;
37         struct list_head        list;
38         int                     rule_size;
39         int                     addr_size;
40         int                     unresolved_rules;
41         int                     nr_goto_rules;
42
43         int                     (*action)(struct fib_rule *,
44                                           struct flowi *, int,
45                                           struct fib_lookup_arg *);
46         int                     (*match)(struct fib_rule *,
47                                          struct flowi *, int);
48         int                     (*configure)(struct fib_rule *,
49                                              struct sk_buff *,
50                                              struct fib_rule_hdr *,
51                                              struct nlattr **);
52         int                     (*compare)(struct fib_rule *,
53                                            struct fib_rule_hdr *,
54                                            struct nlattr **);
55         int                     (*fill)(struct fib_rule *, struct sk_buff *,
56                                         struct fib_rule_hdr *);
57         u32                     (*default_pref)(struct fib_rules_ops *ops);
58         size_t                  (*nlmsg_payload)(struct fib_rule *);
59
60         /* Called after modifications to the rules set, must flush
61          * the route cache if one exists. */
62         void                    (*flush_cache)(struct fib_rules_ops *ops);
63
64         int                     nlgroup;
65         const struct nla_policy *policy;
66         struct list_head        rules_list;
67         struct module           *owner;
68         struct net              *fro_net;
69 };
70
71 #define FRA_GENERIC_POLICY \
72         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
73         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
74         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
75         [FRA_FWMARK]    = { .type = NLA_U32 }, \
76         [FRA_FWMASK]    = { .type = NLA_U32 }, \
77         [FRA_TABLE]     = { .type = NLA_U32 }, \
78         [FRA_GOTO]      = { .type = NLA_U32 }
79
80 static inline void fib_rule_get(struct fib_rule *rule)
81 {
82         atomic_inc(&rule->refcnt);
83 }
84
85 static inline void fib_rule_put_rcu(struct rcu_head *head)
86 {
87         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
88         release_net(rule->fr_net);
89         kfree(rule);
90 }
91
92 static inline void fib_rule_put(struct fib_rule *rule)
93 {
94         if (atomic_dec_and_test(&rule->refcnt))
95                 call_rcu(&rule->rcu, fib_rule_put_rcu);
96 }
97
98 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
99 {
100         if (nla[FRA_TABLE])
101                 return nla_get_u32(nla[FRA_TABLE]);
102         return frh->table;
103 }
104
105 extern int fib_rules_register(struct fib_rules_ops *);
106 extern void fib_rules_unregister(struct fib_rules_ops *);
107 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
108
109 extern int                      fib_rules_lookup(struct fib_rules_ops *,
110                                                  struct flowi *, int flags,
111                                                  struct fib_lookup_arg *);
112 extern int                      fib_default_rule_add(struct fib_rules_ops *,
113                                                      u32 pref, u32 table,
114                                                      u32 flags);
115 #endif