425 lines
11 KiB
C
425 lines
11 KiB
C
/*
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* PPP High Level Link Control (HDLC) Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: hdlc.c,v 1.18 1997/09/10 21:33:32 brian Exp $
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*
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* TODO:
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*/
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#include "fsm.h"
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#include "hdlc.h"
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#include "lcpproto.h"
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#include "lcp.h"
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#include "lqr.h"
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#include "loadalias.h"
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#include "vars.h"
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#include "pred.h"
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#include "modem.h"
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#include "ccp.h"
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struct hdlcstat {
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int badfcs;
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int badaddr;
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int badcommand;
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int unknownproto;
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} HdlcStat;
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static int ifOutPackets, ifOutOctets, ifOutLQRs;
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static int ifInPackets, ifInOctets;
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struct protostat {
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u_short number;
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char *name;
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u_long in_count;
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u_long out_count;
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} ProtocolStat[] = {
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{
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PROTO_IP, "IP"
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},
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{
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PROTO_VJUNCOMP, "VJ_UNCOMP"
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},
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{
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PROTO_VJCOMP, "VJ_COMP"
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},
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{
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PROTO_COMPD, "COMPD"
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},
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{
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PROTO_LCP, "LCP"
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},
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{
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PROTO_IPCP, "IPCP"
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},
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{
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PROTO_CCP, "CCP"
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},
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{
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PROTO_PAP, "PAP"
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},
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{
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PROTO_LQR, "LQR"
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},
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{
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PROTO_CHAP, "CHAP"
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},
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{
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0, "Others"
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},
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};
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static u_short const fcstab[256] = {
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/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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u_char EscMap[33];
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void
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HdlcInit()
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{
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ifInOctets = ifOutOctets = 0;
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ifInPackets = ifOutPackets = 0;
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ifOutLQRs = 0;
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}
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/*
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* HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section
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* 2.27 for further details.
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*/
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inline u_short
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HdlcFcs(u_short fcs, u_char * cp, int len)
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{
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while (len--)
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fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
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return (fcs);
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}
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void
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HdlcOutput(int pri, u_short proto, struct mbuf * bp)
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{
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struct mbuf *mhp, *mfcs;
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struct protostat *statp;
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struct lqrdata *lqr;
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u_char *cp;
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u_short fcs;
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if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */
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if (CcpFsm.state == ST_OPENED) {
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if (CcpInfo.want_proto == TY_PRED1) {
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Pred1Output(pri, proto, bp);
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return;
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}
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}
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}
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if (DEV_IS_SYNC)
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mfcs = NULLBUFF;
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else
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mfcs = mballoc(2, MB_HDLCOUT);
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mhp = mballoc(4, MB_HDLCOUT);
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mhp->cnt = 0;
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cp = MBUF_CTOP(mhp);
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if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) {
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*cp++ = HDLC_ADDR;
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*cp++ = HDLC_UI;
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mhp->cnt += 2;
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}
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/*
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* If possible, compress protocol field.
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*/
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if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) {
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*cp++ = proto;
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mhp->cnt++;
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} else {
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*cp++ = proto >> 8;
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*cp = proto & 0377;
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mhp->cnt += 2;
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}
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mhp->next = bp;
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bp->next = mfcs;
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lqr = &MyLqrData;
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lqr->PeerOutPackets = ifOutPackets++;
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ifOutOctets += plength(mhp) + 1;
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lqr->PeerOutOctets = ifOutOctets;
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if (proto == PROTO_LQR) {
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lqr->MagicNumber = LcpInfo.want_magic;
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lqr->LastOutLQRs = HisLqrData.PeerOutLQRs;
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lqr->LastOutPackets = HisLqrData.PeerOutPackets;
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lqr->LastOutOctets = HisLqrData.PeerOutOctets;
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lqr->PeerInLQRs = HisLqrSave.SaveInLQRs;
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lqr->PeerInPackets = HisLqrSave.SaveInPackets;
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lqr->PeerInDiscards = HisLqrSave.SaveInDiscards;
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lqr->PeerInErrors = HisLqrSave.SaveInErrors;
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lqr->PeerInOctets = HisLqrSave.SaveInOctets;
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lqr->PeerOutLQRs = ++ifOutLQRs;
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LqrDump("LqrOutput", lqr);
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LqrChangeOrder(lqr, (struct lqrdata *) (MBUF_CTOP(bp)));
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}
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if (!DEV_IS_SYNC) {
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fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt);
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fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt);
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fcs = ~fcs;
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cp = MBUF_CTOP(mfcs);
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*cp++ = fcs & 0377; /* Low byte first!! */
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*cp++ = fcs >> 8;
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}
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LogDumpBp(LogHDLC, "HdlcOutput", mhp);
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for (statp = ProtocolStat; statp->number; statp++)
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if (statp->number == proto)
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break;
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statp->out_count++;
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if (DEV_IS_SYNC)
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ModemOutput(pri, mhp);
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else
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AsyncOutput(pri, mhp, proto);
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}
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void
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DecodePacket(u_short proto, struct mbuf * bp)
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{
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u_char *cp;
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LogPrintf(LogDEBUG, "DecodePacket: proto = %04x\n", proto);
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switch (proto) {
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case PROTO_LCP:
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LcpInput(bp);
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break;
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case PROTO_PAP:
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PapInput(bp);
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break;
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case PROTO_LQR:
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HisLqrSave.SaveInLQRs++;
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LqrInput(bp);
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break;
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case PROTO_CHAP:
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ChapInput(bp);
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break;
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case PROTO_VJUNCOMP:
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case PROTO_VJCOMP:
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bp = VjCompInput(bp, proto);
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if (bp == NULLBUFF) {
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break;
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}
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/* fall down */
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case PROTO_IP:
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IpInput(bp);
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break;
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case PROTO_IPCP:
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IpcpInput(bp);
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break;
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case PROTO_CCP:
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CcpInput(bp);
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break;
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case PROTO_COMPD:
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Pred1Input(bp);
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break;
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default:
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LogPrintf(LogPHASE, "Unknown protocol 0x%04x\n", proto);
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bp->offset -= 2;
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bp->cnt += 2;
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cp = MBUF_CTOP(bp);
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LcpSendProtoRej(cp, bp->cnt);
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HisLqrSave.SaveInDiscards++;
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HdlcStat.unknownproto++;
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pfree(bp);
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break;
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}
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}
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int
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ReportProtStatus()
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{
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struct protostat *statp;
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int cnt;
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statp = ProtocolStat;
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statp--;
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cnt = 0;
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fprintf(VarTerm, " Protocol in out Protocol in out\n");
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do {
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statp++;
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fprintf(VarTerm, " %-9s: %8lu, %8lu",
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statp->name, statp->in_count, statp->out_count);
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if (++cnt == 2) {
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fprintf(VarTerm, "\n");
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cnt = 0;
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}
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} while (statp->number);
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if (cnt)
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fprintf(VarTerm, "\n");
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return (1);
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}
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int
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ReportHdlcStatus()
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{
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struct hdlcstat *hp = &HdlcStat;
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if (VarTerm) {
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fprintf(VarTerm, "HDLC level errors\n\n");
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fprintf(VarTerm, "FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n",
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hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto);
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}
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return 0;
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}
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static struct hdlcstat laststat;
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void
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HdlcErrorCheck()
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{
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struct hdlcstat *hp = &HdlcStat;
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struct hdlcstat *op = &laststat;
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if (bcmp(hp, op, sizeof(laststat))) {
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LogPrintf(LogPHASE, "HDLC errors -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n",
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hp->badfcs - op->badfcs, hp->badaddr - op->badaddr,
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hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto);
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}
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laststat = HdlcStat;
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}
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void
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HdlcInput(struct mbuf * bp)
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{
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u_short fcs, proto;
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u_char *cp, addr, ctrl;
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struct protostat *statp;
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LogDumpBp(LogHDLC, "HdlcInput:", bp);
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if (DEV_IS_SYNC)
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fcs = GOODFCS;
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else
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fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt);
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HisLqrSave.SaveInOctets += bp->cnt + 1;
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LogPrintf(LogDEBUG, "HdlcInput: fcs = %04x (%s)\n",
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fcs, (fcs == GOODFCS) ? "good" : "bad");
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if (fcs != GOODFCS) {
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HisLqrSave.SaveInErrors++;
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LogPrintf(LogDEBUG, "HdlcInput: Bad FCS\n");
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HdlcStat.badfcs++;
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pfree(bp);
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return;
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}
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if (!DEV_IS_SYNC)
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bp->cnt -= 2; /* discard FCS part */
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if (bp->cnt < 2) { /* XXX: raise this bar ? */
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pfree(bp);
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return;
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}
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cp = MBUF_CTOP(bp);
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ifInPackets++;
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ifInOctets += bp->cnt;
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if (!LcpInfo.want_acfcomp) {
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/*
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* We expect that packet is not compressed.
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*/
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addr = *cp++;
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if (addr != HDLC_ADDR) {
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HisLqrSave.SaveInErrors++;
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HdlcStat.badaddr++;
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LogPrintf(LogDEBUG, "HdlcInput: addr %02x\n", *cp);
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pfree(bp);
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return;
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}
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ctrl = *cp++;
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if (ctrl != HDLC_UI) {
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HisLqrSave.SaveInErrors++;
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HdlcStat.badcommand++;
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LogPrintf(LogDEBUG, "HdlcInput: %02x\n", *cp);
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pfree(bp);
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return;
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}
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bp->offset += 2;
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bp->cnt -= 2;
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} else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
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/*
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* We can receive compressed packet, but peer still send uncompressed
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* packet to me.
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*/
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cp += 2;
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bp->offset += 2;
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bp->cnt -= 2;
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}
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if (LcpInfo.want_protocomp) {
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proto = 0;
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cp--;
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do {
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cp++;
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bp->offset++;
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bp->cnt--;
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proto = proto << 8;
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proto += *cp;
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} while (!(proto & 1));
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} else {
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proto = *cp++ << 8;
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proto |= *cp++;
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bp->offset += 2;
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bp->cnt -= 2;
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}
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for (statp = ProtocolStat; statp->number; statp++)
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if (statp->number == proto)
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break;
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statp->in_count++;
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HisLqrSave.SaveInPackets++;
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DecodePacket(proto, bp);
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}
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