/* if_imphost.h 4.2 82/02/12 */
* Host structure used with IMP's.
* Used to hold outgoing packets which
* would exceed allowed RFNM count.
* These structures are packed into
* mbuf's and kept as small as possible.
struct mbuf
*h_q
; /* holding queue */
struct in_addr h_addr
; /* host's address */
u_short h_status
; /* host status */
u_char h_rfnm
; /* # outstanding rfnm's */
u_char h_refcnt
; /* reference count */
#define HOSTS_DOWN 0 /* host believed down */
#define HOSTS_UP 128 /* host up */
* Host structures, as seen inside an mbuf.
* Hashing on the host address is used to
* select an index into the first mbuf. Collisions
* are then resolved by searching successive
* mbuf's at the same index. Reclamation is done
* automatically at the time a structure is free'd.
#define HPMBUF ((MLEN - sizeof(int)) / sizeof(struct host))
#define HOSTHASH(a) ((a.s_addr) % HPMBUF)
int hm_count
; /* # of struct's in use */
struct host hm_hosts
[HPMBUF
]; /* data structures proper */
struct host
*hostlookup();
struct host
*hostenter();