usr/src/sys/net/if.h

/*	if.h	4.15	82/06/23	*/

/*
 * Structures defining a network interface, providing a packet
 * transport mechanism (ala level 0 of the PUP protocols).
 *
 * Each interface accepts output datagrams of a specified maximum
 * length, and provides higher level routines with input datagrams
 * received from its medium.
 *
 * Output occurs when the routine if_output is called, with three parameters:
 *	(*ifp->if_output)(ifp, m, dst)
 * Here m is the mbuf chain to be sent and dst is the destination address.
 * The output routine encapsulates the supplied datagram if necessary,
 * and then transmits it on its medium.
 *
 * On input, each interface unwraps the data received by it, and either
 * places it on the input queue of a internetwork datagram routine
 * and posts the associated software interrupt, or passes the datagram to a raw
 * packet input routine.
 *
 * Routines exist for locating interfaces by their addresses
 * or for locating a interface on a certain network, as well as more general
 * routing and gateway routines maintaining information used to locate
 * interfaces.  These routines live in the files if.c and route.c
 */

/*
 * Structure defining a queue for a network interface.
 *
 * (Would like to call this struct ``if'', but C isn't PL/1.)
 *
 * EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE
 */
struct ifnet {
	char	*if_name;		/* name, e.g. ``en'' or ``lo'' */
	short	if_unit;		/* sub-unit for lower level driver */
	short	if_mtu;			/* maximum transmission unit */
	int	if_net;			/* network number of interface */
	short	if_flags;		/* up/down, broadcast, etc. */
	short	if_timer;		/* time 'til if_watchdog called */
	int	if_host[2];		/* local net host number */
	struct	sockaddr if_addr;	/* address of interface */
	union {
		struct	sockaddr ifu_broadaddr;
		struct	sockaddr ifu_dstaddr;
	} if_ifu;
#define	if_broadaddr	if_ifu.ifu_broadaddr	/* broadcast address */
#define	if_dstaddr	if_ifu.ifu_dstaddr	/* other end of p-to-p link */
	struct	ifqueue {
		struct	mbuf *ifq_head;
		struct	mbuf *ifq_tail;
		int	ifq_len;
		int	ifq_maxlen;
		int	ifq_drops;
	} if_snd;			/* output queue */
/* procedure handles */
	int	(*if_init)();		/* init routine */
	int	(*if_output)();		/* output routine */
	int	(*if_ubareset)();	/* uba reset routine */
	int	(*if_watchdog)();	/* timer routine */
/* generic interface statistics */
	int	if_ipackets;		/* packets received on interface */
	int	if_ierrors;		/* input errors on interface */
	int	if_opackets;		/* packets sent on interface */
	int	if_oerrors;		/* output errors on interface */
	int	if_collisions;		/* collisions on csma interfaces */
/* end statistics */
	struct	ifnet *if_next;
};

#define	IFF_UP		0x1		/* interface is up */
#define	IFF_BROADCAST	0x2		/* broadcast address valid */
#define	IFF_DEBUG	0x4		/* turn on debugging */
#define	IFF_ROUTE	0x8		/* routing entry installed */
#define	IFF_POINTOPOINT	0x10		/* interface is point-to-point link */

/*
 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
 * input routines have queues of messages stored on ifqueue structures
 * (defined above).  Entries are added to and deleted from these structures
 * by these macros, which should be called with ipl raised to splimp().
 */
#define	IF_QFULL(ifq)		((ifq)->ifq_len >= (ifq)->ifq_maxlen)
#define	IF_DROP(ifq)		((ifq)->ifq_drops++)
#define	IF_ENQUEUE(ifq, m) { \
	(m)->m_act = 0; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_head = m; \
	else \
		(ifq)->ifq_tail->m_act = m; \
	(ifq)->ifq_tail = m; \
	(ifq)->ifq_len++; \
}
#define	IF_PREPEND(ifq, m) { \
	(m)->m_act = (ifq)->ifq_head; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_tail = (m); \
	(ifq)->ifq_head = (m); \
	(ifq)->ifq_len++; \
}
#define	IF_DEQUEUE(ifq, m) { \
	(m) = (ifq)->ifq_head; \
	if (m) { \
		if (((ifq)->ifq_head = (m)->m_act) == 0) \
			(ifq)->ifq_tail = 0; \
		(m)->m_act = 0; \
		(ifq)->ifq_len--; \
	} \
}

#define	IFQ_MAXLEN	50
#define	IFNET_SLOWHZ	1		/* granularity is 1 second */

#ifdef KERNEL
#ifdef INET
struct	ifqueue	ipintrq;		/* ip packet input queue */
#endif
struct	ifqueue rawintrq;		/* raw packet input queue */
struct	ifnet *ifnet;
struct	ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf();
struct	ifnet *if_ifonnetof();
struct	in_addr if_makeaddr();
#endif
Commit	Line	Data
	1	/* if.h 4.15 82/06/23 */
	2
	3	/*
	4	* Structures defining a network interface, providing a packet
	5	* transport mechanism (ala level 0 of the PUP protocols).
	6	*
	7	* Each interface accepts output datagrams of a specified maximum
	8	* length, and provides higher level routines with input datagrams
	9	* received from its medium.
	10	*
	11	* Output occurs when the routine if_output is called, with three parameters:
	12	* (*ifp->if_output)(ifp, m, dst)
	13	* Here m is the mbuf chain to be sent and dst is the destination address.
	14	* The output routine encapsulates the supplied datagram if necessary,
	15	* and then transmits it on its medium.
	16	*
	17	* On input, each interface unwraps the data received by it, and either
	18	* places it on the input queue of a internetwork datagram routine
	19	* and posts the associated software interrupt, or passes the datagram to a raw
	20	* packet input routine.
	21	*
	22	* Routines exist for locating interfaces by their addresses
	23	* or for locating a interface on a certain network, as well as more general
	24	* routing and gateway routines maintaining information used to locate
	25	* interfaces. These routines live in the files if.c and route.c
	26	*/
	27
	28	/*
	29	* Structure defining a queue for a network interface.
	30	*
	31	* (Would like to call this struct ``if'', but C isn't PL/1.)
	32	*
	33	* EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE
	34	*/
	35	struct ifnet {
	36	char if_name; / name, e.g. ``en'' or ``lo'' */
	37	short if_unit; /* sub-unit for lower level driver */
	38	short if_mtu; /* maximum transmission unit */
	39	int if_net; /* network number of interface */
	40	short if_flags; /* up/down, broadcast, etc. */
	41	short if_timer; /* time 'til if_watchdog called */
	42	int if_host[2]; /* local net host number */
	43	struct sockaddr if_addr; /* address of interface */
	44	union {
	45	struct sockaddr ifu_broadaddr;
	46	struct sockaddr ifu_dstaddr;
	47	} if_ifu;
	48	#define if_broadaddr if_ifu.ifu_broadaddr /* broadcast address */
	49	#define if_dstaddr if_ifu.ifu_dstaddr /* other end of p-to-p link */
	50	struct ifqueue {
	51	struct mbuf *ifq_head;
	52	struct mbuf *ifq_tail;
	53	int ifq_len;
	54	int ifq_maxlen;
	55	int ifq_drops;
	56	} if_snd; /* output queue */
	57	/* procedure handles */
	58	int (if_init)(); / init routine */
	59	int (if_output)(); / output routine */
	60	int (if_ubareset)(); / uba reset routine */
	61	int (if_watchdog)(); / timer routine */
	62	/* generic interface statistics */
	63	int if_ipackets; /* packets received on interface */
	64	int if_ierrors; /* input errors on interface */
	65	int if_opackets; /* packets sent on interface */
	66	int if_oerrors; /* output errors on interface */
	67	int if_collisions; /* collisions on csma interfaces */
	68	/* end statistics */
	69	struct ifnet *if_next;
	70	};
	71
	72	#define IFF_UP 0x1 /* interface is up */
	73	#define IFF_BROADCAST 0x2 /* broadcast address valid */
	74	#define IFF_DEBUG 0x4 /* turn on debugging */
	75	#define IFF_ROUTE 0x8 /* routing entry installed */
	76	#define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
	77
	78	/*
	79	* Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
	80	* input routines have queues of messages stored on ifqueue structures
	81	* (defined above). Entries are added to and deleted from these structures
	82	* by these macros, which should be called with ipl raised to splimp().
	83	*/
	84	#define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
	85	#define IF_DROP(ifq) ((ifq)->ifq_drops++)
	86	#define IF_ENQUEUE(ifq, m) { \
	87	(m)->m_act = 0; \
	88	if ((ifq)->ifq_tail == 0) \
	89	(ifq)->ifq_head = m; \
	90	else \
	91	(ifq)->ifq_tail->m_act = m; \
	92	(ifq)->ifq_tail = m; \
	93	(ifq)->ifq_len++; \
	94	}
	95	#define IF_PREPEND(ifq, m) { \
	96	(m)->m_act = (ifq)->ifq_head; \
	97	if ((ifq)->ifq_tail == 0) \
	98	(ifq)->ifq_tail = (m); \
	99	(ifq)->ifq_head = (m); \
	100	(ifq)->ifq_len++; \
	101	}
	102	#define IF_DEQUEUE(ifq, m) { \
	103	(m) = (ifq)->ifq_head; \
	104	if (m) { \
	105	if (((ifq)->ifq_head = (m)->m_act) == 0) \
	106	(ifq)->ifq_tail = 0; \
	107	(m)->m_act = 0; \
	108	(ifq)->ifq_len--; \
	109	} \
	110	}
	111
	112	#define IFQ_MAXLEN 50
	113	#define IFNET_SLOWHZ 1 /* granularity is 1 second */
	114
	115	#ifdef KERNEL
	116	#ifdef INET
	117	struct ifqueue ipintrq; /* ip packet input queue */
	118	#endif
	119	struct ifqueue rawintrq; /* raw packet input queue */
	120	struct ifnet *ifnet;
	121	struct ifnet if_ifwithaddr(), if_ifwithnet(), *if_ifwithaf();
	122	struct ifnet *if_ifonnetof();
	123	struct in_addr if_makeaddr();
	124	#endif