FreeBSD/Linux Kernel Cross Reference
sys/device/if_hdr.h

     /* 
      * Mach Operating System
      * Copyright (c) 1991,1990,1989 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        if_hdr.h,v $
     * Revision 2.5  91/05/14  15:48:37  mrt
     *      Correcting copyright
     * 
     * Revision 2.4  91/02/05  17:09:44  mrt
     *      Changed to new Mach copyright
     *      [91/01/31  17:29:39  mrt]
     * 
     * Revision 2.3  90/09/09  14:31:33  rpd
     *      Use decl_simple_lock_data.
     *      [90/08/30            rpd]
     * 
     * Revision 2.2  90/01/11  11:42:08  dbg
     *      Add locking.
     *      [89/11/27            dbg]
     * 
     * Revision 2.1  89/08/03  15:28:52  rwd
     * Created.
     * 
     * 13-Mar-89  David Golub (dbg) at Carnegie-Mellon University
     *      Added packet filter.
     *
     *  3-Mar-89  David Golub (dbg) at Carnegie-Mellon University
     *      Created.
     */
    /*
     *      Taken from (bsd)net/if.h.  Modified for MACH kernel.
     */
    /*
     * 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 the above copyright notice and this paragraph are
     * duplicated in all such forms and that any documentation,
     * advertising materials, and other materials related to such
     * distribution and use acknowledge that the software was developed
     * by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
     * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     *
     *      @(#)if.h        7.3 (Berkeley) 6/27/88
     */
    
    #ifndef _IF_HDR_
    #define _IF_HDR_
    
    #include <kern/lock.h>
    #include <kern/queue.h>
    
    /*
     * Queue for network output and filter input.
     */
    struct ifqueue {
            queue_head_t    ifq_head;       /* queue of io_req_t */
            int             ifq_len;        /* length of queue */
            int             ifq_maxlen;     /* maximum length of queue */
            int             ifq_drops;      /* number of packets dropped
                                               because queue full */
            decl_simple_lock_data(,
                            ifq_lock)       /* lock for queue and counters */
    };
    
    /*
     * Header for network interface drivers.
     */
    struct ifnet {
            short   if_unit;                /* unit number */
            short   if_flags;               /* up/down, broadcast, etc. */
           short   if_timer;               /* time until if_watchdog called */
           short   if_mtu;                 /* maximum transmission unit */
           short   if_header_size;         /* length of header */
           short   if_header_format;       /* format of hardware header */
           short   if_address_size;        /* length of hardware address */
           short   if_alloc_size;          /* size of read buffer to allocate */
           char    *if_address;            /* pointer to hardware address */
           struct ifqueue if_snd;          /* output queue */
           queue_head_t if_rcv_port_list;  /* input filter list */
           decl_simple_lock_data(,
                   if_rcv_port_list_lock)  /* lock for filter list */
   /* statistics */
           int     if_ipackets;            /* packets received */
           int     if_ierrors;             /* input errors */
           int     if_opackets;            /* packets sent */
           int     if_oerrors;             /* output errors */
           int     if_collisions;          /* collisions on csma interfaces */
           int     if_rcvdrops;            /* packets received but dropped */
   };
   
   #define IFF_UP          0x0001          /* interface is up */
   #define IFF_BROADCAST   0x0002          /* interface can broadcast */
   #define IFF_DEBUG       0x0004          /* turn on debugging */
   #define IFF_LOOPBACK    0x0008          /* is a loopback net */
   #define IFF_POINTOPOINT 0x0010          /* point-to-point link */
   #define IFF_RUNNING     0x0040          /* resources allocated */
   #define IFF_NOARP       0x0080          /* no address resolution protocol */
   #define IFF_PROMISC     0x0100          /* receive all packets */
   #define IFF_ALLMULTI    0x0200          /* receive all multicast packets */
   #define IFF_BRIDGE      0x0100          /* support token ring routing field */
   #define IFF_SNAP        0x0200          /* support extended sap header */
   
   /* internal flags only: */
   #define IFF_CANTCHANGE  (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING)
   
   /*
    * Output queues (ifp->if_snd)
    * have queues of messages stored on ifqueue structures.  Entries
    * are added to and deleted from these structures by these macros, which
    * should be called with ipl raised to splimp().
    * XXX locking XXX
    */
   
   #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
   #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
   #define IF_ENQUEUE(ifq, ior) { \
           simple_lock(&(ifq)->ifq_lock); \
           enqueue_tail(&(ifq)->ifq_head, (queue_entry_t)ior); \
           (ifq)->ifq_len++; \
           simple_unlock(&(ifq)->ifq_lock); \
   }
   #define IF_PREPEND(ifq, ior) { \
           simple_lock(&(ifq)->ifq_lock); \
           enqueue_head(&(ifq)->ifq_head, (queue_entry_t)ior); \
           (ifq)->ifq_len++; \
           simple_unlock(&(ifq)->ifq_lock); \
   }
   
   #define IF_DEQUEUE(ifq, ior) { \
           simple_lock(&(ifq)->ifq_lock); \
           if (((ior) = (io_req_t)dequeue_head(&(ifq)->ifq_head)) != 0) \
               (ifq)->ifq_len--; \
           simple_unlock(&(ifq)->ifq_lock); \
   }
   
   #define IFQ_MAXLEN      50
   
   #define IFQ_INIT(ifq) { \
           queue_init(&(ifq)->ifq_head); \
           simple_lock_init(&(ifq)->ifq_lock); \
           (ifq)->ifq_len = 0; \
           (ifq)->ifq_maxlen = IFQ_MAXLEN; \
           (ifq)->ifq_drops = 0; \
   }
   
   #define IFNET_SLOWHZ    1               /* granularity is 1 second */
   
   #endif  _IF_HDR_

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