1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 31 /* 32 * Definition for Async HDLC 33 */ 34 #define HDLC_SYN 0x7e /* SYNC character */ 35 #define HDLC_ESC 0x7d /* Escape character */ 36 #define HDLC_XOR 0x20 /* Modifier value */ 37 38 #define HDLC_ADDR 0xff 39 #define HDLC_UI 0x03 40 /* 41 * Definition for HDLC Frame Check Sequence 42 */ 43 #define INITFCS 0xffff /* Initial value for FCS computation */ 44 #define GOODFCS 0xf0b8 /* Good FCS value */ 45 46 #define DEF_MRU 1500 47 #define MAX_MRU 2048 48 #define MIN_MRU 296 49 50 #define DEF_MTU 0 /* whatever peer says */ 51 #define MAX_MTU 2048 52 #define MIN_MTU 296 53 54 struct physical; 55 struct link; 56 struct lcp; 57 struct bundle; 58 struct mbuf; 59 struct cmdargs; 60 61 struct hdlc { 62 struct pppTimer ReportTimer; 63 64 struct { 65 int badfcs; 66 int badaddr; 67 int badcommand; 68 int unknownproto; 69 } laststats, stats; 70 71 struct { 72 struct lcp *owner; /* parent LCP */ 73 struct pppTimer timer; /* When to send */ 74 int method; /* bit-mask for LQM_* from lqr.h */ 75 76 u_int32_t ifOutUniPackets; /* Packets sent by me */ 77 u_int32_t ifOutOctets; /* Octets sent by me */ 78 u_int32_t ifInUniPackets; /* Packets received from peer */ 79 u_int32_t ifInDiscards; /* Discards */ 80 u_int32_t ifInErrors; /* Errors */ 81 u_int32_t ifInOctets; /* Octets received from peer (unused) */ 82 83 struct { 84 u_int32_t InGoodOctets; /* Good octets received from peer */ 85 u_int32_t OutLQRs; /* LQRs sent by me */ 86 u_int32_t InLQRs; /* LQRs received from peer */ 87 88 struct lqrsavedata Save; /* Our last LQR */ 89 struct lqrsavedata prevSave; /* Our last-but-one LQR (analysis) */ 90 91 struct lqrdata peer; /* Last LQR from peer */ 92 int peer_timeout; /* peers max lqr timeout */ 93 int resent; /* Resent last packet `resent' times */ 94 } lqr; 95 96 struct { 97 u_int32_t seq_sent; /* last echo sent */ 98 u_int32_t seq_recv; /* last echo received */ 99 } echo; 100 } lqm; 101 }; 102 103 104 extern void hdlc_Init(struct hdlc *, struct lcp *); 105 extern void hdlc_StartTimer(struct hdlc *); 106 extern void hdlc_StopTimer(struct hdlc *); 107 extern int hdlc_ReportStatus(struct cmdargs const *); 108 extern const char *hdlc_Protocol2Nam(u_short); 109 extern void hdlc_DecodePacket(struct bundle *, u_short, struct mbuf *, 110 struct link *); 111 112 extern u_short hdlc_Fcs(u_char *, size_t); 113 extern int hdlc_Detect(u_char const **, unsigned, int); 114 #define hdlc_WrapperOctets() (2) 115 116 extern struct layer hdlclayer; 117