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         struct list_head        list;
  12         atomic_t                refcnt;
  13         int                     iifindex;
  14         int                     oifindex;
  15         u32                     mark;
  16         u32                     mark_mask;
  17         u32                     pref;
  18         u32                     flags;
  19         u32                     table;
  20         u8                      action;
  21         u32                     target;
  22         struct fib_rule *       ctarget;
  23         char                    iifname[IFNAMSIZ];
  24         char                    oifname[IFNAMSIZ];
  25         struct rcu_head         rcu;
  26         struct net *            fr_net;
  27 };
  28
  29 struct fib_lookup_arg {
  30         void                    *lookup_ptr;
  31         void                    *result;
  32         struct fib_rule         *rule;
  33 };
  34
  35 struct fib_rules_ops {
  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 fib_rule_hdr *,
  51                                              struct nlattr **);
  52         int                     (*compare)(struct fib_rule *,
  53                                            struct fib_rule_hdr *,
  54                                            struct nlattr **);
  55         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  56                                         struct fib_rule_hdr *);
  57         u32                     (*default_pref)(struct fib_rules_ops *ops);
  58         size_t                  (*nlmsg_payload)(struct fib_rule *);
  59
  60         /* Called after modifications to the rules set, must flush
  61          * the route cache if one exists. */
  62         void                    (*flush_cache)(struct fib_rules_ops *ops);
  63
  64         int                     nlgroup;
  65         const struct nla_policy *policy;
  66         struct list_head        rules_list;
  67         struct module           *owner;
  68         struct net              *fro_net;
  69         struct rcu_head         rcu;
  70 };
  71
  72 #define FRA_GENERIC_POLICY \
  73         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  74         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  75         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  76         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  77         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  78         [FRA_TABLE]     = { .type = NLA_U32 }, \
  79         [FRA_GOTO]      = { .type = NLA_U32 }
  80
  81 static inline void fib_rule_get(struct fib_rule *rule)
  82 {
  83         atomic_inc(&rule->refcnt);
  84 }
  85
  86 static inline void fib_rule_put_rcu(struct rcu_head *head)
  87 {
  88         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  89         release_net(rule->fr_net);
  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 struct fib_rules_ops *fib_rules_register(struct fib_rules_ops *, struct net *);
 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