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/netlink.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         struct rcu_head         rcu;
  23 };
  24
  25 struct fib_lookup_arg
  26 {
  27         void                    *lookup_ptr;
  28         void                    *result;
  29         struct fib_rule         *rule;
  30 };
  31
  32 struct fib_rules_ops
  33 {
  34         int                     family;
  35         struct list_head        list;
  36         int                     rule_size;
  37
  38         int                     (*action)(struct fib_rule *,
  39                                           struct flowi *, int,
  40                                           struct fib_lookup_arg *);
  41         int                     (*match)(struct fib_rule *,
  42                                          struct flowi *, int);
  43         int                     (*configure)(struct fib_rule *,
  44                                              struct sk_buff *,
  45                                              struct nlmsghdr *,
  46                                              struct fib_rule_hdr *,
  47                                              struct nlattr **);
  48         int                     (*compare)(struct fib_rule *,
  49                                            struct fib_rule_hdr *,
  50                                            struct nlattr **);
  51         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  52                                         struct nlmsghdr *,
  53                                         struct fib_rule_hdr *);
  54         u32                     (*default_pref)(void);
  55         size_t                  (*nlmsg_payload)(struct fib_rule *);
  56
  57         int                     nlgroup;
  58         struct nla_policy       *policy;
  59         struct list_head        *rules_list;
  60         struct module           *owner;
  61 };
  62
  63 #define FRA_GENERIC_POLICY \
  64         [FRA_IFNAME]    = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  65         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  66         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  67         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  68         [FRA_TABLE]     = { .type = NLA_U32 }
  69
  70 static inline void fib_rule_get(struct fib_rule *rule)
  71 {
  72         atomic_inc(&rule->refcnt);
  73 }
  74
  75 static inline void fib_rule_put_rcu(struct rcu_head *head)
  76 {
  77         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  78         kfree(rule);
  79 }
  80
  81 static inline void fib_rule_put(struct fib_rule *rule)
  82 {
  83         if (atomic_dec_and_test(&rule->refcnt))
  84                 call_rcu(&rule->rcu, fib_rule_put_rcu);
  85 }
  86
  87 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
  88 {
  89         if (nla[FRA_TABLE])
  90                 return nla_get_u32(nla[FRA_TABLE]);
  91         return frh->table;
  92 }
  93
  94 extern int                      fib_rules_register(struct fib_rules_ops *);
  95 extern int                      fib_rules_unregister(struct fib_rules_ops *);
  96
  97 extern int                      fib_rules_lookup(struct fib_rules_ops *,
  98                                                  struct flowi *, int flags,
  99                                                  struct fib_lookup_arg *);
 100
 101 extern int                      fib_nl_newrule(struct sk_buff *,
 102                                                struct nlmsghdr *, void *);
 103 extern int                      fib_nl_delrule(struct sk_buff *,
 104                                                struct nlmsghdr *, void *);
 105 extern int                      fib_rules_dump(struct sk_buff *,
 106                                                struct netlink_callback *, int);
 107 #endif