Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
fib_rules.h
Go to the documentation of this file.
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  void (*delete)(struct fib_rule *);
56  int (*compare)(struct fib_rule *,
57  struct fib_rule_hdr *,
58  struct nlattr **);
59  int (*fill)(struct fib_rule *, struct sk_buff *,
60  struct fib_rule_hdr *);
61  u32 (*default_pref)(struct fib_rules_ops *ops);
62  size_t (*nlmsg_payload)(struct fib_rule *);
63 
64  /* Called after modifications to the rules set, must flush
65  * the route cache if one exists. */
66  void (*flush_cache)(struct fib_rules_ops *ops);
67 
68  int nlgroup;
69  const struct nla_policy *policy;
70  struct list_head rules_list;
71  struct module *owner;
72  struct net *fro_net;
73  struct rcu_head rcu;
74 };
75 
76 #define FRA_GENERIC_POLICY \
77  [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
78  [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
79  [FRA_PRIORITY] = { .type = NLA_U32 }, \
80  [FRA_FWMARK] = { .type = NLA_U32 }, \
81  [FRA_FWMASK] = { .type = NLA_U32 }, \
82  [FRA_TABLE] = { .type = NLA_U32 }, \
83  [FRA_GOTO] = { .type = NLA_U32 }
84 
85 static inline void fib_rule_get(struct fib_rule *rule)
86 {
87  atomic_inc(&rule->refcnt);
88 }
89 
90 static inline void fib_rule_put_rcu(struct rcu_head *head)
91 {
92  struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
93  release_net(rule->fr_net);
94  kfree(rule);
95 }
96 
97 static inline void fib_rule_put(struct fib_rule *rule)
98 {
99  if (atomic_dec_and_test(&rule->refcnt))
100  call_rcu(&rule->rcu, fib_rule_put_rcu);
101 }
102 
103 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
104 {
105  if (nla[FRA_TABLE])
106  return nla_get_u32(nla[FRA_TABLE]);
107  return frh->table;
108 }
109 
110 extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
111 extern void fib_rules_unregister(struct fib_rules_ops *);
112 
113 extern int fib_rules_lookup(struct fib_rules_ops *,
114  struct flowi *, int flags,
115  struct fib_lookup_arg *);
116 extern int fib_default_rule_add(struct fib_rules_ops *,
117  u32 pref, u32 table,
118  u32 flags);
119 extern u32 fib_default_rule_pref(struct fib_rules_ops *ops);
120 #endif
Generated on Thu Jan 10 2013 14:53:04 for Linux Kernel by   doxygen 1.8.2