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/netlink.h>
   9
  10 struct fib_rule
  11 {
  12         struct list_head        list;
  13         atomic_t                refcnt;
  14         int                     ifindex;
  15         char                    ifname[IFNAMSIZ];
  16         u32                     pref;
  17         u32                     flags;
  18         u32                     table;
  19         u8                      action;
  20         struct rcu_head         rcu;
  21 };
  22
  23 struct fib_lookup_arg
  24 {
  25         void                    *lookup_ptr;
  26         void                    *result;
  27         struct fib_rule         *rule;
  28 };
  29
  30 struct fib_rules_ops
  31 {
  32         int                     family;
  33         struct list_head        list;
  34         int                     rule_size;
  35
  36         int                     (*action)(struct fib_rule *,
  37                                           struct flowi *, int,
  38                                           struct fib_lookup_arg *);
  39         int                     (*match)(struct fib_rule *,
  40                                          struct flowi *, int);
  41         int                     (*configure)(struct fib_rule *,
  42                                              struct sk_buff *,
  43                                              struct nlmsghdr *,
  44                                              struct fib_rule_hdr *,
  45                                              struct nlattr **);
  46         int                     (*compare)(struct fib_rule *,
  47                                            struct fib_rule_hdr *,
  48                                            struct nlattr **);
  49         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  50                                         struct nlmsghdr *,
  51                                         struct fib_rule_hdr *);
  52         u32                     (*default_pref)(void);
  53
  54         int                     nlgroup;
  55         struct nla_policy       *policy;
  56         struct list_head        *rules_list;
  57         struct module           *owner;
  58 };
  59
  60 static inline void fib_rule_get(struct fib_rule *rule)
  61 {
  62         atomic_inc(&rule->refcnt);
  63 }
  64
  65 static inline void fib_rule_put_rcu(struct rcu_head *head)
  66 {
  67         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  68         kfree(rule);
  69 }
  70
  71 static inline void fib_rule_put(struct fib_rule *rule)
  72 {
  73         if (atomic_dec_and_test(&rule->refcnt))
  74                 call_rcu(&rule->rcu, fib_rule_put_rcu);
  75 }
  76
  77 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
  78 {
  79         if (nla[FRA_TABLE])
  80                 return nla_get_u32(nla[FRA_TABLE]);
  81         return frh->table;
  82 }
  83
  84 extern int                      fib_rules_register(struct fib_rules_ops *);
  85 extern int                      fib_rules_unregister(struct fib_rules_ops *);
  86
  87 extern int                      fib_rules_lookup(struct fib_rules_ops *,
  88                                                  struct flowi *, int flags,
  89                                                  struct fib_lookup_arg *);
  90
  91 extern int                      fib_nl_newrule(struct sk_buff *,
  92                                                struct nlmsghdr *, void *);
  93 extern int                      fib_nl_delrule(struct sk_buff *,
  94                                                struct nlmsghdr *, void *);
  95 extern int                      fib_rules_dump(struct sk_buff *,
  96                                                struct netlink_callback *, int);
  97 #endif