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