usr.sbin/ppp/layer.h

   1 /*-
   2  * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/ppp/layer.h,v 1.3 1999/08/28 01:18:31 peter Exp $
  27  * $DragonFly: src/usr.sbin/ppp/layer.h,v 1.2 2003/06/17 04:30:00 dillon Exp $
  28  */
  29
  30 #define LAYER_ASYNC     2
  31 #define LAYER_SYNC      3
  32 #define LAYER_HDLC      4
  33 #define LAYER_ACF       5
  34 #define LAYER_PROTO     6
  35 #define LAYER_LQR       7
  36 #define LAYER_CCP       8
  37 #define LAYER_VJ        9
  38 #define LAYER_NAT       10
  39
  40 #define LAYER_MAX       10      /* How many layers we can handle on a link */
  41
  42 struct mbuf;
  43 struct link;
  44 struct bundle;
  45
  46 struct layer {
  47   int type;
  48   const char *name;
  49   struct mbuf *(*push)(struct bundle *, struct link *, struct mbuf *,
  50                        int pri, u_short *proto);
  51   struct mbuf *(*pull)(struct bundle *, struct link *, struct mbuf *,
  52                        u_short *);
  53 };