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 }; 54