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   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                     ifindex;
  14         char                    ifname[IFNAMSIZ];
  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         struct rcu_head         rcu;
  24         struct net *            fr_net;
  25 };
  26
  27 struct fib_lookup_arg {
  28         void                    *lookup_ptr;
  29         void                    *result;
  30         struct fib_rule         *rule;
  31 };
  32
  33 struct fib_rules_ops {
  34         int                     family;
  35         struct list_head        list;
  36         int                     rule_size;
  37         int                     addr_size;
  38         int                     unresolved_rules;
  39         int                     nr_goto_rules;
  40
  41         int                     (*action)(struct fib_rule *,
  42                                           struct flowi *, int,
  43                                           struct fib_lookup_arg *);
  44         int                     (*match)(struct fib_rule *,
  45                                          struct flowi *, int);
  46         int                     (*configure)(struct fib_rule *,
  47                                              struct sk_buff *,
  48                                              struct fib_rule_hdr *,
  49                                              struct nlattr **);
  50         int                     (*compare)(struct fib_rule *,
  51                                            struct fib_rule_hdr *,
  52                                            struct nlattr **);
  53         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  54                                         struct fib_rule_hdr *);
  55         u32                     (*default_pref)(struct fib_rules_ops *ops);
  56         size_t                  (*nlmsg_payload)(struct fib_rule *);
  57
  58         /* Called after modifications to the rules set, must flush
  59          * the route cache if one exists. */
  60         void                    (*flush_cache)(struct fib_rules_ops *ops);
  61
  62         int                     nlgroup;
  63         const struct nla_policy *policy;
  64         struct list_head        rules_list;
  65         struct module           *owner;
  66         struct net              *fro_net;
  67 };
  68
  69 #define FRA_GENERIC_POLICY \
  70         [FRA_IFNAME]    = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  71         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  72         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  73         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  74         [FRA_TABLE]     = { .type = NLA_U32 }, \
  75         [FRA_GOTO]      = { .type = NLA_U32 }
  76
  77 static inline void fib_rule_get(struct fib_rule *rule)
  78 {
  79         atomic_inc(&rule->refcnt);
  80 }
  81
  82 static inline void fib_rule_put_rcu(struct rcu_head *head)
  83 {
  84         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  85         release_net(rule->fr_net);
  86         kfree(rule);
  87 }
  88
  89 static inline void fib_rule_put(struct fib_rule *rule)
  90 {
  91         if (atomic_dec_and_test(&rule->refcnt))
  92                 call_rcu(&rule->rcu, fib_rule_put_rcu);
  93 }
  94
  95 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
  96 {
  97         if (nla[FRA_TABLE])
  98                 return nla_get_u32(nla[FRA_TABLE]);
  99         return frh->table;
 100 }
 101
 102 extern int fib_rules_register(struct fib_rules_ops *);
 103 extern void fib_rules_unregister(struct fib_rules_ops *);
 104 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 105
 106 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 107                                                  struct flowi *, int flags,
 108                                                  struct fib_lookup_arg *);
 109 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 110                                                      u32 pref, u32 table,
 111                                                      u32 flags);
 112 #endif