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 {
  12         struct list_head        list;
  13         atomic_t                refcnt;
  14         int                     ifindex;
  15         char                    ifname[IFNAMSIZ];
  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         struct rcu_head         rcu;
  25 };
  26
  27 struct fib_lookup_arg
  28 {
  29         void                    *lookup_ptr;
  30         void                    *result;
  31         struct fib_rule         *rule;
  32 };
  33
  34 struct fib_rules_ops
  35 {
  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 nlmsghdr *,
  51                                              struct fib_rule_hdr *,
  52                                              struct nlattr **);
  53         int                     (*compare)(struct fib_rule *,
  54                                            struct fib_rule_hdr *,
  55                                            struct nlattr **);
  56         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  57                                         struct nlmsghdr *,
  58                                         struct fib_rule_hdr *);
  59         u32                     (*default_pref)(void);
  60         size_t                  (*nlmsg_payload)(struct fib_rule *);
  61
  62         /* Called after modifications to the rules set, must flush
  63          * the route cache if one exists. */
  64         void                    (*flush_cache)(void);
  65
  66         int                     nlgroup;
  67         const struct nla_policy *policy;
  68         struct list_head        rules_list;
  69         struct module           *owner;
  70 };
  71
  72 #define FRA_GENERIC_POLICY \
  73         [FRA_IFNAME]    = { .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         kfree(rule);
  89 }
  90
  91 static inline void fib_rule_put(struct fib_rule *rule)
  92 {
  93         if (atomic_dec_and_test(&rule->refcnt))
  94                 call_rcu(&rule->rcu, fib_rule_put_rcu);
  95 }
  96
  97 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
  98 {
  99         if (nla[FRA_TABLE])
 100                 return nla_get_u32(nla[FRA_TABLE]);
 101         return frh->table;
 102 }
 103
 104 extern int                      fib_rules_register(struct fib_rules_ops *);
 105 extern int                      fib_rules_unregister(struct fib_rules_ops *);
 106
 107 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 108                                                  struct flowi *, int flags,
 109                                                  struct fib_lookup_arg *);
 110 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 111                                                      u32 pref, u32 table,
 112                                                      u32 flags);
 113 #endif