]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - include/net/fib_rules.h
fib: RCU conversion of fib_lookup()
[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/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 *       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
84 static inline void fib_rule_get(struct fib_rule *rule)
85 {
86         atomic_inc(&rule->refcnt);
87 }
88
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
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
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