hdlc.c revision 46686
16059Samurai/* 26059Samurai * PPP High Level Link Control (HDLC) Module 36059Samurai * 46059Samurai * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 56059Samurai * 66059Samurai * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 76059Samurai * 86059Samurai * Redistribution and use in source and binary forms are permitted 96059Samurai * provided that the above copyright notice and this paragraph are 106059Samurai * duplicated in all such forms and that any documentation, 116059Samurai * advertising materials, and other materials related to such 126059Samurai * distribution and use acknowledge that the software was developed 136059Samurai * by the Internet Initiative Japan, Inc. The name of the 146059Samurai * IIJ may not be used to endorse or promote products derived 156059Samurai * from this software without specific prior written permission. 166059Samurai * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 176059Samurai * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 186059Samurai * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 198857Srgrimes * 2046686Sbrian * $Id: hdlc.c,v 1.41 1999/04/03 11:54:00 brian Exp $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 2443313Sbrian#include <sys/param.h> 2530715Sbrian#include <netinet/in.h> 2636285Sbrian#include <netinet/in_systm.h> 2736285Sbrian#include <netinet/ip.h> 2836285Sbrian#include <sys/un.h> 2930715Sbrian 3030715Sbrian#include <stdio.h> 3130715Sbrian#include <string.h> 3230715Sbrian#include <termios.h> 3330715Sbrian 3437009Sbrian#include "defs.h" 3546686Sbrian#include "layer.h" 3631343Sbrian#include "command.h" 3730715Sbrian#include "mbuf.h" 3830715Sbrian#include "log.h" 3930715Sbrian#include "timer.h" 406059Samurai#include "fsm.h" 4136285Sbrian#include "lqr.h" 426059Samurai#include "hdlc.h" 4346686Sbrian#include "proto.h" 4436285Sbrian#include "iplist.h" 4536285Sbrian#include "throughput.h" 4636285Sbrian#include "slcompress.h" 4730733Sbrian#include "ipcp.h" 4830733Sbrian#include "ip.h" 4930733Sbrian#include "vjcomp.h" 5036285Sbrian#include "auth.h" 5130733Sbrian#include "pap.h" 526059Samurai#include "lcp.h" 5331343Sbrian#include "async.h" 5413389Sphk#include "ccp.h" 5536285Sbrian#include "link.h" 5636285Sbrian#include "descriptor.h" 5743888Sbrian#include "chap.h" 5836285Sbrian#include "physical.h" 5936285Sbrian#include "prompt.h" 6036285Sbrian#include "chat.h" 6136285Sbrian#include "mp.h" 6238174Sbrian#include "cbcp.h" 6336285Sbrian#include "datalink.h" 6436285Sbrian#include "filter.h" 6543313Sbrian#ifndef NORADIUS 6643313Sbrian#include "radius.h" 6743313Sbrian#endif 6836285Sbrian#include "bundle.h" 696059Samurai 7037210Sbrianstatic u_int16_t const fcstab[256] = { 7128679Sbrian /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 7228679Sbrian /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 7328679Sbrian /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 7428679Sbrian /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 7528679Sbrian /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 7628679Sbrian /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 7728679Sbrian /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 7828679Sbrian /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 7928679Sbrian /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 8028679Sbrian /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 8128679Sbrian /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 8228679Sbrian /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 8328679Sbrian /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 8428679Sbrian /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 8528679Sbrian /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 8628679Sbrian /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 8728679Sbrian /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 8828679Sbrian /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 8928679Sbrian /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 9028679Sbrian /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 9128679Sbrian /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 9228679Sbrian /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 9328679Sbrian /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 9428679Sbrian /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 9528679Sbrian /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 9628679Sbrian /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 9728679Sbrian /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 9828679Sbrian /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 9928679Sbrian /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 10028679Sbrian /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 10128679Sbrian /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 10228679Sbrian /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 1036059Samurai}; 1046059Samurai 1056059Samuraivoid 10636285Sbrianhdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 1076059Samurai{ 10836285Sbrian memset(hdlc, '\0', sizeof(struct hdlc)); 10936285Sbrian hdlc->lqm.owner = lcp; 1106059Samurai} 1116059Samurai 1126059Samurai/* 1136059Samurai * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 1146059Samurai * 2.27 for further details. 1156059Samurai */ 11646686Sbrianu_short 11746686Sbrianhdlc_Fcs(u_char *cp, size_t len) 1186059Samurai{ 11946686Sbrian u_short fcs = INITFCS; 12046686Sbrian 1216059Samurai while (len--) 1226059Samurai fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 12346686Sbrian 12446686Sbrian return fcs; 1256059Samurai} 1266059Samurai 12732663Sbrianstatic inline u_short 12831514SbrianHdlcFcsBuf(u_short fcs, struct mbuf *m) 12931514Sbrian{ 13031514Sbrian int len; 13131514Sbrian u_char *pos, *end; 13231514Sbrian 13336285Sbrian len = mbuf_Length(m); 13431514Sbrian pos = MBUF_CTOP(m); 13531514Sbrian end = pos + m->cnt; 13631514Sbrian while (len--) { 13731514Sbrian fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 13831514Sbrian if (pos == end && len) { 13931514Sbrian m = m->next; 14031514Sbrian pos = MBUF_CTOP(m); 14131514Sbrian end = pos + m->cnt; 14231514Sbrian } 14331514Sbrian } 14431514Sbrian return (fcs); 14531514Sbrian} 14631514Sbrian 14746686Sbrianint 14846686Sbrianhdlc_WrapperOctets(struct lcp *lcp, u_short proto) 1496059Samurai{ 15046686Sbrian return 2; 15146686Sbrian} 15246686Sbrian 15346686Sbrianstatic struct mbuf * 15446686Sbrianhdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 15546686Sbrian int pri, u_short *proto) 15646686Sbrian{ 15746686Sbrian struct mbuf *last; 1586059Samurai u_char *cp; 1596059Samurai u_short fcs; 1606059Samurai 16146686Sbrian fcs = HdlcFcsBuf(INITFCS, bp); 16246686Sbrian fcs = ~fcs; 16331514Sbrian 16446686Sbrian for (last = bp; last->next; last = last->next) 16546686Sbrian ; 16628679Sbrian 16746686Sbrian if (last->size - last->offset - last->cnt >= 2) { 16846686Sbrian cp = MBUF_CTOP(last) + last->cnt; 16946686Sbrian last->cnt += 2; 1706059Samurai } else { 17146686Sbrian struct mbuf *tail = mbuf_Alloc(2, MB_HDLCOUT); 17246686Sbrian last->next = tail; 17346686Sbrian cp = MBUF_CTOP(tail); 1746059Samurai } 17536285Sbrian 17646686Sbrian *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 17746686Sbrian *cp++ = fcs >> 8; 17836285Sbrian 17946686Sbrian log_DumpBp(LogHDLC, "hdlc_Output", bp); 18036285Sbrian 18146686Sbrian return bp; 1826059Samurai} 1836059Samurai 18431537Sbrian/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 18531537Sbrianstatic struct { 18631537Sbrian u_short from; 18731537Sbrian u_short to; 18831537Sbrian const char *name; 18931537Sbrian} protocols[] = { 19031537Sbrian { 0x0001, 0x0001, "Padding Protocol" }, 19131537Sbrian { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 19231537Sbrian { 0x0021, 0x0021, "Internet Protocol" }, 19331537Sbrian { 0x0023, 0x0023, "OSI Network Layer" }, 19431537Sbrian { 0x0025, 0x0025, "Xerox NS IDP" }, 19531537Sbrian { 0x0027, 0x0027, "DECnet Phase IV" }, 19631537Sbrian { 0x0029, 0x0029, "Appletalk" }, 19731537Sbrian { 0x002b, 0x002b, "Novell IPX" }, 19831537Sbrian { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 19931537Sbrian { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 20031537Sbrian { 0x0031, 0x0031, "Bridging PDU" }, 20131537Sbrian { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 20231537Sbrian { 0x0035, 0x0035, "Banyan Vines" }, 20331537Sbrian { 0x0037, 0x0037, "reserved (until 1993)" }, 20431537Sbrian { 0x0039, 0x0039, "AppleTalk EDDP" }, 20531537Sbrian { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 20631537Sbrian { 0x003d, 0x003d, "Multi-Link" }, 20731537Sbrian { 0x003f, 0x003f, "NETBIOS Framing" }, 20831537Sbrian { 0x0041, 0x0041, "Cisco Systems" }, 20931537Sbrian { 0x0043, 0x0043, "Ascom Timeplex" }, 21031537Sbrian { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 21131537Sbrian { 0x0047, 0x0047, "DCA Remote Lan" }, 21231537Sbrian { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 21331537Sbrian { 0x004b, 0x004b, "SNA over 802.2" }, 21431537Sbrian { 0x004d, 0x004d, "SNA" }, 21531537Sbrian { 0x004f, 0x004f, "IP6 Header Compression" }, 21631537Sbrian { 0x0051, 0x0051, "KNX Bridging Data" }, 21731537Sbrian { 0x0053, 0x0053, "Encryption" }, 21831537Sbrian { 0x0055, 0x0055, "Individual Link Encryption" }, 21931537Sbrian { 0x006f, 0x006f, "Stampede Bridging" }, 22031537Sbrian { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 22131537Sbrian { 0x0073, 0x0073, "MP+ Protocol" }, 22231537Sbrian { 0x007d, 0x007d, "reserved (Control Escape)" }, 22331537Sbrian { 0x007f, 0x007f, "reserved (compression inefficient)" }, 22431537Sbrian { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 22531537Sbrian { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 22631537Sbrian { 0x00fd, 0x00fd, "1st choice compression" }, 22731537Sbrian { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 22831537Sbrian { 0x0200, 0x02ff, "(compression inefficient)" }, 22931537Sbrian { 0x0201, 0x0201, "802.1d Hello Packets" }, 23031537Sbrian { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 23131537Sbrian { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 23231537Sbrian { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 23331537Sbrian { 0x0209, 0x0209, "Netcs Twin Routing" }, 23431537Sbrian { 0x0231, 0x0231, "Luxcom" }, 23531537Sbrian { 0x0233, 0x0233, "Sigma Network Systems" }, 23631537Sbrian { 0x0235, 0x0235, "Apple Client Server Protocol" }, 23731537Sbrian { 0x1e00, 0x1eff, "(compression inefficient)" }, 23831537Sbrian { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 23931537Sbrian { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 24031537Sbrian { 0x4021, 0x4021, "Stacker LZS" }, 24131537Sbrian { 0x8001, 0x801f, "Not Used - reserved" }, 24231537Sbrian { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 24331537Sbrian { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 24431537Sbrian { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 24531537Sbrian { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 24631537Sbrian { 0x8029, 0x8029, "Appletalk Control Protocol" }, 24731537Sbrian { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 24831537Sbrian { 0x802d, 0x802d, "reserved" }, 24931537Sbrian { 0x802f, 0x802f, "reserved" }, 25031537Sbrian { 0x8031, 0x8031, "Bridging NCP" }, 25131537Sbrian { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 25231537Sbrian { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 25331537Sbrian { 0x8037, 0x8037, "reserved till 1993" }, 25431537Sbrian { 0x8039, 0x8039, "reserved" }, 25531537Sbrian { 0x803b, 0x803b, "reserved" }, 25631537Sbrian { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 25731537Sbrian { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 25831537Sbrian { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 25931537Sbrian { 0x8043, 0x8043, "Ascom Timeplex" }, 26031537Sbrian { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 26131537Sbrian { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 26231537Sbrian { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 26331537Sbrian { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 26431537Sbrian { 0x804d, 0x804d, "SNA Control Protocol" }, 26531537Sbrian { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 26631537Sbrian { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 26731537Sbrian { 0x8053, 0x8053, "Encryption Control Protocol" }, 26831537Sbrian { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 26931537Sbrian { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 27031537Sbrian { 0x8073, 0x8073, "MP+ Control Protocol" }, 27131537Sbrian { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 27231537Sbrian { 0x807d, 0x807d, "Not Used - reserved" }, 27331537Sbrian { 0x80cf, 0x80cf, "Not Used - reserved" }, 27431537Sbrian { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 27531537Sbrian { 0x80fd, 0x80fd, "Compression Control Protocol" }, 27631537Sbrian { 0x80ff, 0x80ff, "Not Used - reserved" }, 27731537Sbrian { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 27831537Sbrian { 0x8209, 0x8209, "Netcs Twin Routing" }, 27931537Sbrian { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 28031537Sbrian { 0xc021, 0xc021, "Link Control Protocol" }, 28131537Sbrian { 0xc023, 0xc023, "Password Authentication Protocol" }, 28231537Sbrian { 0xc025, 0xc025, "Link Quality Report" }, 28331537Sbrian { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 28431537Sbrian { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 28531537Sbrian { 0xc081, 0xc081, "Container Control Protocol" }, 28631537Sbrian { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 28731537Sbrian { 0xc225, 0xc225, "RSA Authentication Protocol" }, 28831537Sbrian { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 28931537Sbrian { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 29031537Sbrian { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 29131537Sbrian { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 29231537Sbrian { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 29331537Sbrian}; 29431537Sbrian 29531962Sbrian#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 29631537Sbrian 29736285Sbrianconst char * 29836285Sbrianhdlc_Protocol2Nam(u_short proto) 29931537Sbrian{ 30031537Sbrian int f; 30131537Sbrian 30231537Sbrian for (f = 0; f < NPROTOCOLS; f++) 30331537Sbrian if (proto >= protocols[f].from && proto <= protocols[f].to) 30431537Sbrian return protocols[f].name; 30531537Sbrian else if (proto < protocols[f].from) 30631537Sbrian break; 30731537Sbrian return "unrecognised protocol"; 30831537Sbrian} 30931537Sbrian 31046686Sbrianstatic struct mbuf * 31146686Sbrianhdlc_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, 31246686Sbrian u_short *proto) 3136059Samurai{ 31436285Sbrian struct physical *p = link2physical(l); 31546686Sbrian u_short fcs; 31646686Sbrian int len; 3179448Samurai 31846686Sbrian if (!p) { 31946686Sbrian log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 32046686Sbrian return bp; 3216059Samurai } 3226059Samurai 32346686Sbrian log_DumpBp(LogHDLC, "hdlc_Input:", bp); 3246059Samurai 32546686Sbrian fcs = hdlc_Fcs(MBUF_CTOP(bp), bp->cnt); 3266059Samurai 32746686Sbrian log_Printf(LogDEBUG, "%s: hdlc_Input: fcs = %04x (%s)\n", 32846686Sbrian p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 3296059Samurai 3306059Samurai if (fcs != GOODFCS) { 33146686Sbrian p->hdlc.lqm.SaveInErrors++; 33246686Sbrian p->hdlc.stats.badfcs++; 33336285Sbrian mbuf_Free(bp); 33446686Sbrian return NULL; 3356059Samurai } 33625019Sphk 33746686Sbrian p->hdlc.lqm.SaveInOctets += bp->cnt + 1; 33846686Sbrian p->hdlc.lqm.SaveInPackets++; 33946686Sbrian 34046686Sbrian len = mbuf_Length(bp); 34146686Sbrian if (len < 4) { /* rfc1662 section 4.3 */ 34236285Sbrian mbuf_Free(bp); 34346686Sbrian bp = NULL; 34425019Sphk } 3456059Samurai 34646686Sbrian bp = mbuf_Truncate(bp, len - 2); /* discard the FCS */ 3476059Samurai 34846686Sbrian return bp; 34936285Sbrian} 35036285Sbrian 35136285Sbrian/* 35245264Sbrian * Detect a HDLC frame 35336285Sbrian */ 35436285Sbrian 35545264Sbrianstatic const struct frameheader { 35645264Sbrian const u_char *data; 35745264Sbrian int len; 35845264Sbrian} FrameHeaders[] = { 35945264Sbrian { "\176\377\003\300\041", 5 }, 36045264Sbrian { "\176\377\175\043\300\041", 6 }, 36145264Sbrian { "\176\177\175\043\100\041", 6 }, 36245264Sbrian { "\176\175\337\175\043\300\041", 7 }, 36345264Sbrian { "\176\175\137\175\043\100\041", 7 }, 36445264Sbrian { NULL, 0 } 36536285Sbrian}; 36636285Sbrian 36745264Sbrianint 36845264Sbrianhdlc_Detect(u_char const **cp, int n, int issync) 36936285Sbrian{ 37045264Sbrian const struct frameheader *fh; 37145264Sbrian const u_char *h; 37245264Sbrian size_t len, cmp; 37336285Sbrian 37445264Sbrian while (n) { 37545264Sbrian for (fh = FrameHeaders; fh->len; fh++) { 37645264Sbrian h = issync ? fh->data + 1 : fh->data; 37745264Sbrian len = issync ? fh->len - 1 : fh->len; 37845264Sbrian cmp = n >= len ? len : n; 37945264Sbrian if (memcmp(*cp, h, cmp) == 0) 38045264Sbrian return cmp == len; 38145264Sbrian } 38245264Sbrian n--; 38345264Sbrian (*cp)++; 38436285Sbrian } 38545264Sbrian 38645264Sbrian return 0; 38736285Sbrian} 3886059Samurai 38936285Sbrianint 39036285Sbrianhdlc_ReportStatus(struct cmdargs const *arg) 39136285Sbrian{ 39236285Sbrian struct hdlc *hdlc = &arg->cx->physical->hdlc; 39336285Sbrian 39436285Sbrian prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 39536285Sbrian prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 39636285Sbrian hdlc->stats.badfcs); 39736285Sbrian prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 39836285Sbrian HDLC_ADDR, hdlc->stats.badaddr); 39936285Sbrian prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 40036285Sbrian HDLC_UI, hdlc->stats.badcommand); 40136285Sbrian prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 40236285Sbrian hdlc->stats.unknownproto); 40336285Sbrian return 0; 4046059Samurai} 40536285Sbrian 40636285Sbrianstatic void 40736285Sbrianhdlc_ReportTime(void *v) 40836285Sbrian{ 40936285Sbrian /* Moan about HDLC errors */ 41036285Sbrian struct hdlc *hdlc = (struct hdlc *)v; 41136285Sbrian 41236285Sbrian timer_Stop(&hdlc->ReportTimer); 41336285Sbrian 41436285Sbrian if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 41536285Sbrian log_Printf(LogPHASE, 41636285Sbrian "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 41736285Sbrian hdlc->lqm.owner->fsm.link->name, 41836285Sbrian hdlc->stats.badfcs - hdlc->laststats.badfcs, 41936285Sbrian hdlc->stats.badaddr - hdlc->laststats.badaddr, 42036285Sbrian hdlc->stats.badcommand - hdlc->laststats.badcommand, 42136285Sbrian hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 42236285Sbrian hdlc->laststats = hdlc->stats; 42336285Sbrian } 42436285Sbrian 42536285Sbrian timer_Start(&hdlc->ReportTimer); 42636285Sbrian} 42736285Sbrian 42836285Sbrianvoid 42936285Sbrianhdlc_StartTimer(struct hdlc *hdlc) 43036285Sbrian{ 43136285Sbrian timer_Stop(&hdlc->ReportTimer); 43236285Sbrian hdlc->ReportTimer.load = 60 * SECTICKS; 43336285Sbrian hdlc->ReportTimer.arg = hdlc; 43436285Sbrian hdlc->ReportTimer.func = hdlc_ReportTime; 43536285Sbrian hdlc->ReportTimer.name = "hdlc"; 43636285Sbrian timer_Start(&hdlc->ReportTimer); 43736285Sbrian} 43836285Sbrian 43936285Sbrianvoid 44036285Sbrianhdlc_StopTimer(struct hdlc *hdlc) 44136285Sbrian{ 44236285Sbrian timer_Stop(&hdlc->ReportTimer); 44336285Sbrian} 44446686Sbrian 44546686Sbrianstruct layer hdlclayer = { LAYER_HDLC, "hdlc", hdlc_LayerPush, hdlc_LayerPull }; 446