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/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         int                     (*compare)(struct fib_rule *,
  56                                            struct fib_rule_hdr *,
  57                                            struct nlattr **);
  58         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  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)(struct fib_rules_ops *ops);
  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         struct rcu_head         rcu;
  73 };
  74
  75 #define FRA_GENERIC_POLICY \
  76         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  77         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  78         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  79         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  80         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  81         [FRA_TABLE]     = { .type = NLA_U32 }, \
  82         [FRA_GOTO]      = { .type = NLA_U32 }
  83
  84 static inline void fib_rule_get(struct fib_rule *rule)
  85 {
  86         atomic_inc(&rule->refcnt);
  87 }
  88
  89 static inline void fib_rule_put_rcu(struct rcu_head *head)
  90 {
  91         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  92         release_net(rule->fr_net);
  93         kfree(rule);
  94 }
  95
  96 static inline void fib_rule_put(struct fib_rule *rule)
  97 {
  98         if (atomic_dec_and_test(&rule->refcnt))
  99                 call_rcu(&rule->rcu, fib_rule_put_rcu);
 100 }
 101
 102 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 103 {
 104         if (nla[FRA_TABLE])
 105                 return nla_get_u32(nla[FRA_TABLE]);
 106         return frh->table;
 107 }
 108
 109 extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 110 extern void fib_rules_unregister(struct fib_rules_ops *);
 111
 112 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 113                                                  struct flowi *, int flags,
 114                                                  struct fib_lookup_arg *);
 115 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 116                                                      u32 pref, u32 table,
 117                                                      u32 flags);
 118 extern u32                      fib_default_rule_pref(struct fib_rules_ops *ops);
 119 #endif