365 lines
13 KiB
C
365 lines
13 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if.h 8.1 (Berkeley) 6/10/93
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* $Id$
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*/
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/*
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* Structures defining a network interface, providing a packet
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* transport mechanism (ala level 0 of the PUP protocols).
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*
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* Each interface accepts output datagrams of a specified maximum
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* length, and provides higher level routines with input datagrams
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* received from its medium.
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*
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* Output occurs when the routine if_output is called, with three parameters:
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* (*ifp->if_output)(ifp, m, dst, rt)
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* Here m is the mbuf chain to be sent and dst is the destination address.
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* The output routine encapsulates the supplied datagram if necessary,
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* and then transmits it on its medium.
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*
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* On input, each interface unwraps the data received by it, and either
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* places it on the input queue of a internetwork datagram routine
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* and posts the associated software interrupt, or passes the datagram to a raw
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* packet input routine.
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*
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* Routines exist for locating interfaces by their addresses
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* or for locating a interface on a certain network, as well as more general
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* routing and gateway routines maintaining information used to locate
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* interfaces. These routines live in the files if.c and route.c
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*/
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#ifndef _TIME_ /* XXX fast fix for SNMP, going away soon */
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#include <sys/time.h>
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#endif
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#ifdef __STDC__
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/*
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* Forward structure declarations for function prototypes [sic].
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*/
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struct mbuf;
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struct proc;
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struct rtentry;
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struct socket;
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struct ether_header;
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#endif
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/*
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* Structure describing information about an interface
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* which may be of interest to management entities.
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*/
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/*
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* Structure defining a queue for a network interface.
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*
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* (Would like to call this struct ``if'', but C isn't PL/1.)
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*/
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struct ifnet {
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char *if_name; /* name, e.g. ``en'' or ``lo'' */
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struct ifnet *if_next; /* all struct ifnets are chained */
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struct ifaddr *if_addrlist; /* linked list of addresses per if */
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int if_pcount; /* number of promiscuous listeners */
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caddr_t if_bpf; /* packet filter structure */
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u_short if_index; /* numeric abbreviation for this if */
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short if_unit; /* sub-unit for lower level driver */
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short if_timer; /* time 'til if_watchdog called */
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short if_flags; /* up/down, broadcast, etc. */
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struct if_data {
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/* generic interface information */
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u_char ifi_type; /* ethernet, tokenring, etc */
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u_char ifi_addrlen; /* media address length */
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u_char ifi_hdrlen; /* media header length */
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u_long ifi_mtu; /* maximum transmission unit */
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u_long ifi_metric; /* routing metric (external only) */
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u_long ifi_baudrate; /* linespeed */
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/* volatile statistics */
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u_long ifi_ipackets; /* packets received on interface */
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u_long ifi_ierrors; /* input errors on interface */
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u_long ifi_opackets; /* packets sent on interface */
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u_long ifi_oerrors; /* output errors on interface */
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u_long ifi_collisions; /* collisions on csma interfaces */
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u_long ifi_ibytes; /* total number of octets received */
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u_long ifi_obytes; /* total number of octets sent */
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u_long ifi_imcasts; /* packets received via multicast */
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u_long ifi_omcasts; /* packets sent via multicast */
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u_long ifi_iqdrops; /* dropped on input, this interface */
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u_long ifi_noproto; /* destined for unsupported protocol */
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struct timeval ifi_lastchange;/* last updated */
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} if_data;
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/* procedure handles */
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void (*if_init) /* init routine */
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__P((int));
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int (*if_output) /* output routine (enqueue) */
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__P((struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *));
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void (*if_start) /* initiate output routine */
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__P((struct ifnet *));
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int (*if_done) /* output complete routine */
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__P((struct ifnet *)); /* (XXX not used; fake prototype) */
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int (*if_ioctl) /* ioctl routine */
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__P((struct ifnet *, int, caddr_t));
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void (*if_reset)
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__P((int)); /* new autoconfig will permit removal */
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void (*if_watchdog) /* timer routine */
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__P((int));
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struct ifqueue {
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struct mbuf *ifq_head;
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struct mbuf *ifq_tail;
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int ifq_len;
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int ifq_maxlen;
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int ifq_drops;
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} if_snd; /* output queue */
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};
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#define if_mtu if_data.ifi_mtu
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#define if_type if_data.ifi_type
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#define if_addrlen if_data.ifi_addrlen
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#define if_hdrlen if_data.ifi_hdrlen
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#define if_metric if_data.ifi_metric
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#define if_baudrate if_data.ifi_baudrate
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#define if_ipackets if_data.ifi_ipackets
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#define if_ierrors if_data.ifi_ierrors
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#define if_opackets if_data.ifi_opackets
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#define if_oerrors if_data.ifi_oerrors
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#define if_collisions if_data.ifi_collisions
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#define if_ibytes if_data.ifi_ibytes
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#define if_obytes if_data.ifi_obytes
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#define if_imcasts if_data.ifi_imcasts
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#define if_omcasts if_data.ifi_omcasts
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#define if_iqdrops if_data.ifi_iqdrops
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#define if_noproto if_data.ifi_noproto
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#define if_lastchange if_data.ifi_lastchange
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#define IFF_UP 0x1 /* interface is up */
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#define IFF_BROADCAST 0x2 /* broadcast address valid */
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#define IFF_DEBUG 0x4 /* turn on debugging */
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#define IFF_LOOPBACK 0x8 /* is a loopback net */
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#define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
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#define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
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#define IFF_RUNNING 0x40 /* resources allocated */
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#define IFF_NOARP 0x80 /* no address resolution protocol */
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#define IFF_PROMISC 0x100 /* receive all packets */
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#define IFF_ALLMULTI 0x200 /* receive all multicast packets */
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#define IFF_OACTIVE 0x400 /* transmission in progress */
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#define IFF_SIMPLEX 0x800 /* can't hear own transmissions */
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#define IFF_LINK0 0x1000 /* per link layer defined bit */
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#define IFF_LINK1 0x2000 /* per link layer defined bit */
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#define IFF_LINK2 0x4000 /* per link layer defined bit */
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#define IFF_MULTICAST 0x8000 /* supports multicast */
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/* flags set internally only: */
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#define IFF_CANTCHANGE \
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(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
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IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)
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/*
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* Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
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* input routines have queues of messages stored on ifqueue structures
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* (defined above). Entries are added to and deleted from these structures
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* by these macros, which should be called with ipl raised to splimp().
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*/
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#define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
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#define IF_DROP(ifq) ((ifq)->ifq_drops++)
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#define IF_ENQUEUE(ifq, m) { \
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(m)->m_nextpkt = 0; \
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if ((ifq)->ifq_tail == 0) \
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(ifq)->ifq_head = m; \
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else \
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(ifq)->ifq_tail->m_nextpkt = m; \
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(ifq)->ifq_tail = m; \
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(ifq)->ifq_len++; \
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}
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#define IF_PREPEND(ifq, m) { \
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(m)->m_nextpkt = (ifq)->ifq_head; \
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if ((ifq)->ifq_tail == 0) \
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(ifq)->ifq_tail = (m); \
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(ifq)->ifq_head = (m); \
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(ifq)->ifq_len++; \
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}
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#define IF_DEQUEUE(ifq, m) { \
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(m) = (ifq)->ifq_head; \
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if (m) { \
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if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
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(ifq)->ifq_tail = 0; \
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(m)->m_nextpkt = 0; \
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(ifq)->ifq_len--; \
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} \
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}
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#define IFQ_MAXLEN 50
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#define IFNET_SLOWHZ 1 /* granularity is 1 second */
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/*
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* The ifaddr structure contains information about one address
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* of an interface. They are maintained by the different address families,
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* are allocated and attached when an address is set, and are linked
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* together so all addresses for an interface can be located.
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*/
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struct ifaddr {
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struct sockaddr *ifa_addr; /* address of interface */
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struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
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#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
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struct sockaddr *ifa_netmask; /* used to determine subnet */
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struct ifnet *ifa_ifp; /* back-pointer to interface */
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struct ifaddr *ifa_next; /* next address for interface */
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void (*ifa_rtrequest)(); /* check or clean routes (+ or -)'d */
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u_short ifa_flags; /* mostly rt_flags for cloning */
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short ifa_refcnt; /* extra to malloc for link info */
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int ifa_metric; /* cost of going out this interface */
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#ifdef notdef
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struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
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#endif
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};
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#define IFA_ROUTE RTF_UP /* route installed */
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/*
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* Message format for use in obtaining information about interfaces
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* from getkerninfo and the routing socket
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*/
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struct if_msghdr {
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u_short ifm_msglen; /* to skip over non-understood messages */
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u_char ifm_version; /* future binary compatability */
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u_char ifm_type; /* message type */
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int ifm_addrs; /* like rtm_addrs */
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int ifm_flags; /* value of if_flags */
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u_short ifm_index; /* index for associated ifp */
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struct if_data ifm_data;/* statistics and other data about if */
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};
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/*
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* Message format for use in obtaining information about interface addresses
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* from getkerninfo and the routing socket
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*/
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struct ifa_msghdr {
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u_short ifam_msglen; /* to skip over non-understood messages */
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u_char ifam_version; /* future binary compatability */
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u_char ifam_type; /* message type */
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int ifam_addrs; /* like rtm_addrs */
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int ifam_flags; /* value of ifa_flags */
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u_short ifam_index; /* index for associated ifp */
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int ifam_metric; /* value of ifa_metric */
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};
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/*
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* Interface request structure used for socket
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* ioctl's. All interface ioctl's must have parameter
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* definitions which begin with ifr_name. The
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* remainder may be interface specific.
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*/
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struct ifreq {
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#define IFNAMSIZ 16
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char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
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union {
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struct sockaddr ifru_addr;
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struct sockaddr ifru_dstaddr;
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struct sockaddr ifru_broadaddr;
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short ifru_flags;
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int ifru_metric;
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caddr_t ifru_data;
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} ifr_ifru;
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#define ifr_addr ifr_ifru.ifru_addr /* address */
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#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
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#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
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#define ifr_flags ifr_ifru.ifru_flags /* flags */
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#define ifr_metric ifr_ifru.ifru_metric /* metric */
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#define ifr_data ifr_ifru.ifru_data /* for use by interface */
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};
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struct ifaliasreq {
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char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
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struct sockaddr ifra_addr;
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struct sockaddr ifra_broadaddr;
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struct sockaddr ifra_mask;
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};
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/*
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* Structure used in SIOCGIFCONF request.
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* Used to retrieve interface configuration
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* for machine (useful for programs which
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* must know all networks accessible).
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*/
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struct ifconf {
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int ifc_len; /* size of associated buffer */
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union {
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caddr_t ifcu_buf;
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struct ifreq *ifcu_req;
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} ifc_ifcu;
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#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
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#define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
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};
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#include <net/if_arp.h>
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#ifdef KERNEL
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#define IFAFREE(ifa) \
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if ((ifa)->ifa_refcnt <= 0) \
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ifafree(ifa); \
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else \
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(ifa)->ifa_refcnt--;
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struct ifnet *ifnet;
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void ether_ifattach __P((struct ifnet *));
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void ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
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int ether_output __P((struct ifnet *,
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struct mbuf *, struct sockaddr *, struct rtentry *));
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char *ether_sprintf __P((u_char *));
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void if_attach __P((struct ifnet *));
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void if_down __P((struct ifnet *));
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void if_qflush __P((struct ifqueue *));
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void if_slowtimo __P((void *));
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void if_up __P((struct ifnet *));
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#ifdef vax
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void ifubareset __P((int));
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#endif
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int ifconf __P((int, caddr_t));
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void ifinit __P((void));
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int ifioctl __P((struct socket *, int, caddr_t, struct proc *));
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int ifpromisc __P((struct ifnet *, int));
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struct ifnet *ifunit __P((char *));
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struct ifaddr *ifa_ifwithaddr __P((struct sockaddr *));
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struct ifaddr *ifa_ifwithaf __P((int));
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struct ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));
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struct ifaddr *ifa_ifwithnet __P((struct sockaddr *));
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struct ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,
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struct sockaddr *));
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struct ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
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void ifafree __P((struct ifaddr *));
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void link_rtrequest __P((int, struct rtentry *, struct sockaddr *));
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int loioctl __P((struct ifnet *, int, caddr_t));
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void loopattach __P((void));
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int looutput __P((struct ifnet *,
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struct mbuf *, struct sockaddr *, struct rtentry *));
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void lortrequest __P((int, struct rtentry *, struct sockaddr *));
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#endif
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