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         struct net *            fr_net;
  26 };
  27
  28 struct fib_lookup_arg
  29 {
  30         void                    *lookup_ptr;
  31         void                    *result;
  32         struct fib_rule         *rule;
  33 };
  34
  35 struct fib_rules_ops
  36 {
  37         int                     family;
  38         struct list_head        list;
  39         int                     rule_size;
  40         int                     addr_size;
  41         int                     unresolved_rules;
  42         int                     nr_goto_rules;
  43
  44         int                     (*action)(struct fib_rule *,
  45                                           struct flowi *, int,
  46                                           struct fib_lookup_arg *);
  47         int                     (*match)(struct fib_rule *,
  48                                          struct flowi *, int);
  49         int                     (*configure)(struct fib_rule *,
  50                                              struct sk_buff *,
  51                                              struct nlmsghdr *,
  52                                              struct fib_rule_hdr *,
  53                                              struct nlattr **);
  54         int                     (*compare)(struct fib_rule *,
  55                                            struct fib_rule_hdr *,
  56                                            struct nlattr **);
  57         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  58                                         struct nlmsghdr *,
  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)(void);
  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 };
  73
  74 #define FRA_GENERIC_POLICY \
  75         [FRA_IFNAME]    = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  76         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  77         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  78         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  79         [FRA_TABLE]     = { .type = NLA_U32 }, \
  80         [FRA_GOTO]      = { .type = NLA_U32 }
  81
  82 static inline void fib_rule_get(struct fib_rule *rule)
  83 {
  84         atomic_inc(&rule->refcnt);
  85 }
  86
  87 static inline void fib_rule_put_rcu(struct rcu_head *head)
  88 {
  89         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  90         kfree(rule);
  91 }
  92
  93 static inline void fib_rule_put(struct fib_rule *rule)
  94 {
  95         if (atomic_dec_and_test(&rule->refcnt))
  96                 call_rcu(&rule->rcu, fib_rule_put_rcu);
  97 }
  98
  99 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 100 {
 101         if (nla[FRA_TABLE])
 102                 return nla_get_u32(nla[FRA_TABLE]);
 103         return frh->table;
 104 }
 105
 106 extern int fib_rules_register(struct fib_rules_ops *);
 107 extern void fib_rules_unregister(struct fib_rules_ops *);
 108 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 109
 110 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 111                                                  struct flowi *, int flags,
 112                                                  struct fib_lookup_arg *);
 113 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 114                                                      u32 pref, u32 table,
 115                                                      u32 flags);
 116 #endif