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This struct is a typedef of _cidrnode_ipv4. It is defined as follows:

struct _cidrnode_ipv4 {
  int threadsafe;
  ck_spinlock_t lock;
  u_int8_t type;
  u_int32_t mask;
  u_int32_t base; /* IP address _NOT_ struct in_addr as it is in host format */
  u_int32_t size;
  struct _cidrnode_ipv4 *low;
  struct _cidrnode_ipv4 *high;

To use this struct, include the file cidrtree.h.

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