* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* %sccs.include.redist.c%
* @(#)if.h 7.22 (Berkeley) %G%
* 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, rt)
* 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
* 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 _TIME_ /* XXX fast fix for SNMP, going away soon */
* Forward structure declarations for function prototypes [sic].
* Structure describing information about an interface
* which may be of interest to management entities.
* Structure defining a queue for a network interface.
* (Would like to call this struct ``if'', but C isn't PL/1.)
char *if_name
; /* name, e.g. ``en'' or ``lo'' */
struct ifnet
*if_next
; /* all struct ifnets are chained */
struct ifaddr
*if_addrlist
; /* linked list of addresses per if */
int if_pcount
; /* number of promiscuous listeners */
caddr_t if_bpf
; /* packet filter structure */
u_short if_index
; /* numeric abbreviation for this if */
short if_unit
; /* sub-unit for lower level driver */
short if_timer
; /* time 'til if_watchdog called */
short if_flags
; /* up/down, broadcast, etc. */
/* generic interface information */
u_char ifi_type
; /* ethernet, tokenring, etc */
u_char ifi_addrlen
; /* media address length */
u_char ifi_hdrlen
; /* media header length */
u_long ifi_mtu
; /* maximum transmission unit */
u_long ifi_metric
; /* routing metric (external only) */
u_long ifi_baudrate
; /* linespeed */
/* volatile statistics */
u_long ifi_ipackets
; /* packets received on interface */
u_long ifi_ierrors
; /* input errors on interface */
u_long ifi_opackets
; /* packets sent on interface */
u_long ifi_oerrors
; /* output errors on interface */
u_long ifi_collisions
; /* collisions on csma interfaces */
u_long ifi_ibytes
; /* total number of octets received */
u_long ifi_obytes
; /* total number of octets sent */
u_long ifi_imcasts
; /* packets received via multicast */
u_long ifi_omcasts
; /* packets sent via multicast */
u_long ifi_iqdrops
; /* dropped on input, this interface */
u_long ifi_noproto
; /* destined for unsupported protocol */
struct timeval ifi_lastchange
;/* last updated */
int (*if_init
) /* init routine */
int (*if_output
) /* output routine (enqueue) */
__P((struct ifnet
*, struct mbuf
*, struct sockaddr
*,
int (*if_start
) /* initiate output routine */
int (*if_done
) /* output complete routine */
__P((struct ifnet
*)); /* (XXX not used; fake prototype) */
int (*if_ioctl
) /* ioctl routine */
__P((struct ifnet
*, int, caddr_t
));
__P((int)); /* new autoconfig will permit removal */
int (*if_watchdog
) /* timer routine */
} if_snd
; /* output queue */
#define if_mtu if_data.ifi_mtu
#define if_type if_data.ifi_type
#define if_addrlen if_data.ifi_addrlen
#define if_hdrlen if_data.ifi_hdrlen
#define if_metric if_data.ifi_metric
#define if_baudrate if_data.ifi_baudrate
#define if_ipackets if_data.ifi_ipackets
#define if_ierrors if_data.ifi_ierrors
#define if_opackets if_data.ifi_opackets
#define if_oerrors if_data.ifi_oerrors
#define if_collisions if_data.ifi_collisions
#define if_ibytes if_data.ifi_ibytes
#define if_obytes if_data.ifi_obytes
#define if_imcasts if_data.ifi_imcasts
#define if_omcasts if_data.ifi_omcasts
#define if_iqdrops if_data.ifi_iqdrops
#define if_noproto if_data.ifi_noproto
#define if_lastchange if_data.ifi_lastchange
#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 */
#define IFF_PROMISC 0x100 /* receive all packets */
#define IFF_ALLMULTI 0x200 /* receive all multicast packets */
#define IFF_OACTIVE 0x400 /* transmission in progress */
#define IFF_SIMPLEX 0x800 /* can't hear own transmissions */
#define IFF_LINK0 0x1000 /* per link layer defined bit */
#define IFF_LINK1 0x2000 /* per link layer defined bit */
#define IFF_LINK2 0x4000 /* per link layer defined bit */
#define IFF_MULTICAST 0x8000 /* supports multicast */
/* flags set internally only: */
(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)
* 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) { \
if ((ifq)->ifq_tail == 0) \
(ifq)->ifq_tail->m_nextpkt = m; \
#define IF_PREPEND(ifq, m) { \
(m)->m_nextpkt = (ifq)->ifq_head; \
if ((ifq)->ifq_tail == 0) \
#define IF_DEQUEUE(ifq, m) { \
if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
#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 sockaddr
*ifa_addr
; /* address of interface */
struct sockaddr
*ifa_dstaddr
; /* other end of p-to-p link */
#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
struct sockaddr
*ifa_netmask
; /* used to determine subnet */
struct ifnet
*ifa_ifp
; /* back-pointer to interface */
struct ifaddr
*ifa_next
; /* next address for interface */
void (*ifa_rtrequest
)(); /* check or clean routes (+ or -)'d */
u_short ifa_flags
; /* mostly rt_flags for cloning */
short ifa_refcnt
; /* extra to malloc for link info */
int ifa_metric
; /* cost of going out this interface */
struct rtentry
*ifa_rt
; /* XXXX for ROUTETOIF ????? */
#define IFA_ROUTE RTF_UP /* route installed */
* Message format for use in obtaining information about interfaces
* from getkerninfo and the routing socket
u_short ifm_msglen
; /* to skip over non-understood messages */
u_char ifm_version
; /* future binary compatability */
u_char ifm_type
; /* message type */
int ifm_addrs
; /* like rtm_addrs */
int ifm_flags
; /* value of if_flags */
u_short ifm_index
; /* index for associated ifp */
struct if_data ifm_data
;/* statistics and other data about if */
* Message format for use in obtaining information about interface addresses
* from getkerninfo and the routing socket
u_short ifam_msglen
; /* to skip over non-understood messages */
u_char ifam_version
; /* future binary compatability */
u_char ifam_type
; /* message type */
int ifam_addrs
; /* like rtm_addrs */
int ifam_flags
; /* value of ifa_flags */
u_short ifam_index
; /* index for associated ifp */
int ifam_metric
; /* value of ifa_metric */
* 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.
char ifr_name
[IFNAMSIZ
]; /* if name, e.g. "en0" */
struct sockaddr ifru_addr
;
struct sockaddr ifru_dstaddr
;
struct sockaddr ifru_broadaddr
;
#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 */
char ifra_name
[IFNAMSIZ
]; /* if name, e.g. "en0" */
struct sockaddr ifra_addr
;
struct sockaddr ifra_broadaddr
;
struct sockaddr ifra_mask
;
* Structure used in SIOCGIFCONF request.
* Used to retrieve interface configuration
* for machine (useful for programs which
* must know all networks accessible).
int ifc_len
; /* size of associated buffer */
#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
#define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
if ((ifa)->ifa_refcnt <= 0) \
void ether_ifattach
__P((struct ifnet
*));
void ether_input
__P((struct ifnet
*, struct ether_header
*, struct mbuf
*));
int ether_output
__P((struct ifnet
*,
struct mbuf
*, struct sockaddr
*, struct rtentry
*));
char *ether_sprintf
__P((u_char
*));
void if_attach
__P((struct ifnet
*));
void if_down
__P((struct ifnet
*));
void if_qflush
__P((struct ifqueue
*));
void if_slowtimo
__P((void *));
void if_up
__P((struct ifnet
*));
void ifubareset
__P((int));
int ifconf
__P((int, caddr_t
));
int ifioctl
__P((struct socket
*, int, caddr_t
, struct proc
*));
int ifpromisc
__P((struct ifnet
*, int));
struct ifnet
*ifunit
__P((char *));
struct ifaddr
*ifa_ifwithaddr
__P((struct sockaddr
*));
struct ifaddr
*ifa_ifwithaf
__P((int));
struct ifaddr
*ifa_ifwithdstaddr
__P((struct sockaddr
*));
struct ifaddr
*ifa_ifwithnet
__P((struct sockaddr
*));
struct ifaddr
*ifa_ifwithroute
__P((int, struct sockaddr
*,
struct ifaddr
*ifaof_ifpforaddr
__P((struct sockaddr
*, struct ifnet
*));
void ifafree
__P((struct ifaddr
*));
void link_rtrequest
__P((int, struct rtentry
*, struct sockaddr
*));
int loioctl
__P((struct ifnet
*, int, caddr_t
));
void loopattach
__P((int));
int looutput
__P((struct ifnet
*,
struct mbuf
*, struct sockaddr
*, struct rtentry
*));
void lortrequest
__P((int, struct rtentry
*, struct sockaddr
*));