1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 5 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 6 * Internet Initiative Japan, Inc (IIJ) 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 /* 34 * Definition for Async HDLC 35 */ 36 #define HDLC_SYN 0x7e /* SYNC character */ 37 #define HDLC_ESC 0x7d /* Escape character */ 38 #define HDLC_XOR 0x20 /* Modifier value */ 39 40 #define HDLC_ADDR 0xff 41 #define HDLC_UI 0x03 42 /* 43 * Definition for HDLC Frame Check Sequence 44 */ 45 #define INITFCS 0xffff /* Initial value for FCS computation */ 46 #define GOODFCS 0xf0b8 /* Good FCS value */ 47 48 #define DEF_MRU 1500 49 #define MAX_MRU 2048 50 #define MIN_MRU 296 51 52 #define DEF_MTU 0 /* whatever peer says */ 53 #define MAX_MTU 2048 54 #define MIN_MTU 296 55 56 struct physical; 57 struct link; 58 struct lcp; 59 struct bundle; 60 struct mbuf; 61 struct cmdargs; 62 63 struct hdlc { 64 struct pppTimer ReportTimer; 65 66 struct { 67 int badfcs; 68 int badaddr; 69 int badcommand; 70 int unknownproto; 71 } laststats, stats; 72 73 struct { 74 struct lcp *owner; /* parent LCP */ 75 struct pppTimer timer; /* When to send */ 76 int method; /* bit-mask for LQM_* from lqr.h */ 77 78 u_int32_t ifOutUniPackets; /* Packets sent by me */ 79 u_int32_t ifOutOctets; /* Octets sent by me */ 80 u_int32_t ifInUniPackets; /* Packets received from peer */ 81 u_int32_t ifInDiscards; /* Discards */ 82 u_int32_t ifInErrors; /* Errors */ 83 u_int32_t ifInOctets; /* Octets received from peer (unused) */ 84 85 struct { 86 u_int32_t InGoodOctets; /* Good octets received from peer */ 87 u_int32_t OutLQRs; /* LQRs sent by me */ 88 u_int32_t InLQRs; /* LQRs received from peer */ 89 90 struct lqrsavedata Save; /* Our last LQR */ 91 struct lqrsavedata prevSave; /* Our last-but-one LQR (analysis) */ 92 93 struct lqrdata peer; /* Last LQR from peer */ 94 int peer_timeout; /* peers max lqr timeout */ 95 int resent; /* Resent last packet `resent' times */ 96 } lqr; 97 98 struct { 99 u_int32_t seq_sent; /* last echo sent */ 100 u_int32_t seq_recv; /* last echo received */ 101 } echo; 102 } lqm; 103 }; 104 105 106 extern void hdlc_Init(struct hdlc *, struct lcp *); 107 extern void hdlc_StartTimer(struct hdlc *); 108 extern void hdlc_StopTimer(struct hdlc *); 109 extern int hdlc_ReportStatus(struct cmdargs const *); 110 extern const char *hdlc_Protocol2Nam(u_short); 111 extern void hdlc_DecodePacket(struct bundle *, u_short, struct mbuf *, 112 struct link *); 113 114 extern u_short hdlc_Fcs(u_char *, size_t); 115 extern int hdlc_Detect(u_char const **, unsigned, int); 116 #define hdlc_WrapperOctets() (2) 117 118 extern struct layer hdlclayer; 119