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/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* Copyright (c) 1994 NeXT Computer, Inc.
*
* @(#)if.h 7.3 (Berkeley) 6/27/88 plus MULTICAST 1.1
*/
#ifndef _IF_
#define _IF_ 1
/*
* 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
*/
#if NeXT
#import <net/netbuf.h>
#import <net/netif.h>
#endif
/*
* Structure defining a queue for a network interface.
*
* (Would like to call this struct ``if'', but C isn't PL/1.)
*/
struct ifnet {
char *if_name; /* name, e.g. ``en'' or ``lo'' */
#if NeXT
char *if_type; /* type of interface */
#endif
short if_unit; /* sub-unit for lower level driver */
short if_mtu; /* maximum transmission unit */
short if_flags; /* up/down, broadcast, etc. */
#if NeXT
#else
short if_timer; /* time 'til if_watchdog called */
#endif
int if_metric; /* routing metric (external only) */
#if NeXT
int if_class; /* class of interface */
#endif
struct ifaddr *if_addrlist; /* linked list of addresses per if */
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 */
#if NeXT
int (*if_control)(); /* control routine */
int (*if_input)(); /* input routine */
netbuf_t (*if_getbuf)(); /* get buffer routine */
#else
int (*if_ioctl)(); /* ioctl routine */
int (*if_reset)(); /* bus reset routine */
int (*if_watchdog)(); /* timer routine */
#endif
/* 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 */
#if NeXT
void *if_private; /* private to interface */
#endif
/* end statistics */
struct ifnet *if_next;
};
#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_LOOPBACK 0x8 /* is a loopback net */
#define IFF_POINTTOPOINT 0x10 /* interface is point-to-point link */
#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 */
#define IFF_PROMISC 0x100 /* receive all packets */
#define IFF_ALLMULTI 0x200 /* receive all multicast packets */
#define IFF_DIALUP 0x400 /* For ISDN */
#define IFF_MULTICAST 0x800 /* supports multicast */
#else
#endif
/*
* 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.
*/
#if NeXT
/* flags set internally only: */
#define IFF_CANTCHANGE (IFF_BROADCAST|IFF_POINTTOPOINT| \
IFF_RUNNING|IFF_AUTOCONF|IFF_AUTODONE|IFF_MULTICAST)
#else
/* flags set internally only: */
#define IFF_CANTCHANGE \
(IFF_BROADCAST | IFF_POINTTOPOINT | IFF_RUNNING | IFF_MULTICAST)
#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;
short ifru_mtu;
u_long ifru_asyncmap; /* For PPP */
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_mtu ifr_ifru.ifru_mtu /* mtu for PPP*/
#define ifr_asyncmap ifr_ifru.ifru_asyncmap /* async control char map */
#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 */
};
#import <net/if_arp.h>
#ifdef KERNEL
struct ifqueue rawintrq; /* raw packet input queue */
struct ifnet *ifnet;
struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet();
struct ifaddr *ifa_ifwithdstaddr();
#endif
#endif /* _IF_ */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.