[unix-history] / usr / src / sys / deprecated / netimp / if_imphost.h

/*	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 host {
	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)

struct hmbuf {
	int	hm_count;		/* # of struct's in use */
	struct	host hm_hosts[HPMBUF];	/* data structures proper */
};

#ifdef KERNEL
struct host *hostlookup();
struct host *hostenter();
#endif
Commit	Line	Data
a2cd4df7	1	/* if_imphost.h 4.2 82/02/12 */
81776a4f SL	2
	3	/*
	4	* Host structure used with IMP's.
	5	* Used to hold outgoing packets which
	6	* would exceed allowed RFNM count.
	7	*
	8	* These structures are packed into
	9	* mbuf's and kept as small as possible.
	10	*/
	11	struct host {
	12	struct mbuf h_q; / holding queue */
	13	struct in_addr h_addr; /* host's address */
	14	u_short h_status; /* host status */
	15	u_char h_rfnm; /* # outstanding rfnm's */
	16	u_char h_refcnt; /* reference count */
	17	};
	18
	19	#define HOSTS_DOWN 0 /* host believed down */
	20	#define HOSTS_UP 128 /* host up */
	21
	22	/*
	23	* Host structures, as seen inside an mbuf.
	24	* Hashing on the host address is used to
	25	* select an index into the first mbuf. Collisions
	26	* are then resolved by searching successive
	27	* mbuf's at the same index. Reclamation is done
	28	* automatically at the time a structure is free'd.
	29	*/
	30	#define HPMBUF ((MLEN - sizeof(int)) / sizeof(struct host))
	31	#define HOSTHASH(a) ((a.s_addr) % HPMBUF)
	32
	33	struct hmbuf {
	34	int hm_count; /* # of struct's in use */
	35	struct host hm_hosts[HPMBUF]; /* data structures proper */
	36	};
	37
	38	#ifdef KERNEL
a2cd4df7 BJ	39	struct host *hostlookup();
a2cd4df7 BJ	40	struct host *hostenter();
81776a4f	41	#endif