1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/hdlc.h,v 1.21.2.1 2001/06/13 21:56:35 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/hdlc.h,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 /* 33 * Definition for Async HDLC 34 */ 35 #define HDLC_SYN 0x7e /* SYNC character */ 36 #define HDLC_ESC 0x7d /* Escape character */ 37 #define HDLC_XOR 0x20 /* Modifier value */ 38 39 #define HDLC_ADDR 0xff 40 #define HDLC_UI 0x03 41 /* 42 * Definition for HDLC Frame Check Sequence 43 */ 44 #define INITFCS 0xffff /* Initial value for FCS computation */ 45 #define GOODFCS 0xf0b8 /* Good FCS value */ 46 47 #define DEF_MRU 1500 48 #define MAX_MRU 2048 49 #define MIN_MRU 296 50 51 #define DEF_MTU 0 /* whatever peer says */ 52 #define MAX_MTU 2048 53 #define MIN_MTU 296 54 55 struct physical; 56 struct link; 57 struct lcp; 58 struct bundle; 59 struct mbuf; 60 struct cmdargs; 61 62 struct hdlc { 63 struct pppTimer ReportTimer; 64 65 struct { 66 int badfcs; 67 int badaddr; 68 int badcommand; 69 int unknownproto; 70 } laststats, stats; 71 72 struct { 73 struct lcp *owner; /* parent LCP */ 74 struct pppTimer timer; /* When to send */ 75 int method; /* bit-mask for LQM_* from lqr.h */ 76 77 u_int32_t OutPackets; /* Packets sent by me */ 78 u_int32_t OutOctets; /* Octets sent by me */ 79 u_int32_t SaveInPackets; /* Packets received from peer */ 80 u_int32_t SaveInDiscards; /* Discards */ 81 u_int32_t SaveInErrors; /* Errors */ 82 u_int32_t SaveInOctets; /* Octets received from peer */ 83 84 struct { 85 u_int32_t OutLQRs; /* LQRs sent by me */ 86 u_int32_t SaveInLQRs; /* LQRs received from peer */ 87 struct lqrdata peer; /* Last LQR from peer */ 88 int peer_timeout; /* peers max lqr timeout */ 89 int resent; /* Resent last packet `resent' times */ 90 } lqr; 91 92 struct { 93 u_int32_t seq_sent; /* last echo sent */ 94 u_int32_t seq_recv; /* last echo received */ 95 } echo; 96 } lqm; 97 }; 98 99 100 extern void hdlc_Init(struct hdlc *, struct lcp *); 101 extern void hdlc_StartTimer(struct hdlc *); 102 extern void hdlc_StopTimer(struct hdlc *); 103 extern int hdlc_ReportStatus(struct cmdargs const *); 104 extern const char *hdlc_Protocol2Nam(u_short); 105 extern void hdlc_DecodePacket(struct bundle *, u_short, struct mbuf *, 106 struct link *); 107 108 extern u_short hdlc_Fcs(u_char *, size_t); 109 extern int hdlc_Detect(u_char const **, int, int); 110 extern int hdlc_WrapperOctets(struct lcp *, u_short); 111 112 extern struct layer hdlclayer; 113