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if.h
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1999-05-11
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#ifndef __IF_32H
#define __IF_32H
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*
* @(#)if.h 7.2 (Berkeley) 12/30/87
*/
/*
* 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
*/
#ifndef IFMIB_ENTRIES
#define IFMIB_ENTRIES 42
#endif
/*
* Structure defining a queue for a network interface.
*
* (Would like to call this struct ``if'', but C isn't PL/1.)
*/
#pragma pack(1) /* force on doubleword boundary */
struct mbuf; /* Pre declaration */
struct ifaddr; /* Pre declaration */
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 */
short if_flags; /* up/down, broadcast, etc. */
short if_timer; /* time 'til if_watchdog called */
int if_metric; /* routing metric (external only) */
struct ifaddr *if_addrlist; /* linked list of addresses per if */
struct ifqueue {
struct mbuf *ifq_head;
struct mbuf *ifq_tail;
short ifq_len;
short ifq_maxlen;
u_short ifq_drops;
} if_snd; /* output queue */
/* procedure handles */
int (*if_init)(void); /* init routine */
int (*if_output)(void); /* output routine */
int (*if_ioctl)(void); /* ioctl routine */
int (*if_reset)(void); /* bus reset routine */
int (*if_watchdog)(void); /* timer routine */
/* generic interface statistics */
u_short if_ipackets; /* do not take icmp redirect flag */
u_short if_ierrors; /* input errors on interface */
u_short if_opackets; /* packets sent on interface */
u_short if_oerrors; /* output errors on interface */
u_short if_collisions; /* 802.3 flag */
/* end statistics */
struct ifnet *if_next;
#ifdef OS2
u_char if_adapternum; /* adapter number */
u_int if_adaptype;
u_int if_broadcast;
u_long if_speed;
/* Interface TCP estimates/controls. Serves the same */
/* purpose as the per-route values in BSD-Reno, but I didn't */
/* have to touch any of the route manipulation code. */
u_short if_rtt; /* Est interface rtt in ms */
u_short if_rttvar; /* Est interface rttvar in ms */
u_short if_rttmin; /* Fixed interface rttmin in ms */
u_short if_sendpipe; /* Send socket buffer/window size */
u_short if_recvpipe; /* Recv socket buffer/window size */
u_short if_ssthresh; /* Gateway buffer limit (slow strt) */
u_long if_eflags; /* Extended Flags */
struct ifqueue if_traceq; /* packet trace queue */
u_short if_segsize; /* segment size for interface*/
u_short if_use576; /* use 576 or 1460 as def. mss if going thru a router */
/* Token Ring IP multicast flag */
u_short if_rfc1469; /* using broadcast or functional address */
/* for IP Mulitcast */
#endif
};
#pragma pack() /* reset to default packing */
#define IF_RTTSCALE 1000
#ifdef OS2
#define IFF_RFC1469_BC 1 /* using broadcast */
#define IFF_RFC1469_FA 2 /* using functional address */
#define IFF_RFC1469_MA 3 /* using mulitcast address */
#endif
#pragma pack(1) /* force on doubleword boundary */
struct ifmib {
short ifNumber; /* number of network interfaces */
struct iftable {
short ifIndex; /* index of this interface */
char ifDescr[45]; /* description */
short ifType; /* type of the interface */
short ifMtu; /* MTU of the interface */
char ifPhysAddr[6]; /* MTU of the interface */
short ifOperStatus;
u_long ifSpeed;
u_long ifLastChange;
u_long ifInOctets;
u_long ifOutOctets;
u_long ifOutDiscards;
u_long ifInDiscards;
u_long ifInErrors;
u_long ifOutErrors;
u_long ifInUnknownProtos;
u_long ifInUcastPkts;
u_long ifOutUcastPkts;
u_long ifInNUcastPkts;
u_long ifOutNUcastPkts;
} iftable[IFMIB_ENTRIES];
};
#pragma pack() /* reset to default packing */
#define IFF_UP 0x1 /* interface is up */
#define IFF_BROADCAST 0x2 /* broadcast address valid */
#define IFF_DEBUG 0x4 /* turn on debugging */
#define IFF_LOOPBACK 0x8 /* is a loopback net */
#define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
#define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
#define IFF_RUNNING 0x40 /* resources allocated */
#define IFF_NOARP 0x80 /* no address resolution protocol */
/* next two not supported now, but reserved: */
#define IFF_PROMISC 0x100 /* receive all packets */
#define IFF_ALLMULTI 0x200 /* receive all multicast packets */
#define IFF_DEFMTU 0x400 /* default mtu of 1500 */
#define IFF_MULTICAST 0x800 /* supports multicast */
/*
* The IFF_MULTICAST flag indicates that the network can support the
* transmission and reception of higher-level (e.g., IP) multicast packets.
* It is independent of hardware support for multicasting; for example,
* point-to-point links or pure broadcast networks may well support
* higher-level multicasts.
*/
#define IFF_BRIDGE 0x1000 /* support token ring routine field */
#define IFF_SNAP 0x2000 /* support extended SAP header */
#define IFF_ETHER 0x4000 /* Ethernet interface */
#define IFF_LOOPBRD 0x8000 /* Ethernet interface */
/* flags set internally only: */
#define IFF_CANTCHANGE (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING)
#ifdef OS2
#define IFFE_PKTTRACE 0x00000001 /* trace datalink where possible */
#define IFFE_IPTRACE 0x00000002 /* trace ONLY IP packets */
#ifdef __32BIT__
struct pkt_trace_hdr {
u_short pt_htype; /* header type */
u_short pt_len; /* in: pt_buf len, out: packet len */
caddr_t _Seg16 pt_data; /* packet */
u_long pt_tstamp; /* time stamp in milliseconds */
};
#endif
#define HT_IP 0x01 /* IP */
#define HT_ETHER 0x06 /* Ethernet */
#define HT_ISO88023 0x07 /* CSMA CD */
#define HT_ISO88025 0x09 /* Token Ring */
#define HT_SLIP 0x1c /* Serial Line IP */
#define HT_PPP 0x18 /* PPP IP */
#endif
/*
* 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++; \
}
/*
* Packets destined for level-1 protocol input routines
* have a pointer to the receiving interface prepended to the data.
* IF_DEQUEUEIF extracts and returns this pointer when dequeueing the packet.
* IF_ADJ should be used otherwise to adjust for its presence.
*/
#define IF_ADJ(m) { \
(m)->m_off += sizeof(struct ifnet *); \
(m)->m_len -= sizeof(struct ifnet *); \
if ((m)->m_len == 0) { \
struct mbuf *n; \
MFREE((m), n); \
(m) = n; \
} \
}
#define IF_DEQUEUEIF(ifq, m, ifp) { \
(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--; \
(ifp) = *(mtod((m), struct ifnet * *)); \
IF_ADJ(m); \
} \
}
#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 */
/*
* The ifaddr structure contains information about one address
* of an interface. They are maintained by the different address families,
* are allocated and attached when an address is set, and are linked
* together so all addresses for an interface can be located.
*/
struct ifaddr {
struct sockaddr ifa_addr; /* address of interface */
union {
struct sockaddr ifu_broadaddr;
struct sockaddr ifu_dstaddr;
} ifa_ifu;
#define ifa_broadaddr ifa_ifu.ifu_broadaddr /* broadcast address */
#define ifa_dstaddr ifa_ifu.ifu_dstaddr /* other end of p-to-p link */
struct ifnet *ifa_ifp; /* back-pointer to interface */
struct ifaddr *ifa_next; /* next address for interface */
};
/*
* Interface request structure used for socket
* ioctl's. All interface ioctl's must have parameter
* definitions which begin with ifr_name. The
* remainder may be interface specific.
*/
struct ifreq {
#define IFNAMSIZ 16
char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
short ifru_flags;
int ifru_metric;
caddr_t ifru_data;
} ifr_ifru;
#define ifr_addr ifr_ifru.ifru_addr /* address */
#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
#define ifr_flags ifr_ifru.ifru_flags /* flags */
#define ifr_metric ifr_ifru.ifru_metric /* metric */
#define ifr_data ifr_ifru.ifru_data /* for use by interface */
};
/*
* Structure used in SIOCGIFCONF request.
* Used to retrieve interface configuration
* for machine (useful for programs which
* must know all networks accessible).
*/
struct ifconf {
int ifc_len; /* size of associated buffer */
union {
caddr_t ifcu_buf;
struct ifreq *ifcu_req;
} ifc_ifcu;
#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
#define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
};
#include <net/if_arp.h>
#endif /* __IF_32H */