hdlc.c revision 54912
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 * 2050479Speter * $FreeBSD: head/usr.sbin/ppp/hdlc.c 54912 1999-12-20 20:29:47Z brian $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 2443313Sbrian#include <sys/param.h> 2536285Sbrian#include <sys/un.h> 2630715Sbrian 2730715Sbrian#include <stdio.h> 2830715Sbrian#include <string.h> 2930715Sbrian#include <termios.h> 3030715Sbrian 3137009Sbrian#include "defs.h" 3246686Sbrian#include "layer.h" 3331343Sbrian#include "command.h" 3430715Sbrian#include "mbuf.h" 3530715Sbrian#include "log.h" 3630715Sbrian#include "timer.h" 376059Samurai#include "fsm.h" 3836285Sbrian#include "lqr.h" 396059Samurai#include "hdlc.h" 4036285Sbrian#include "throughput.h" 4136285Sbrian#include "auth.h" 426059Samurai#include "lcp.h" 4331343Sbrian#include "async.h" 4413389Sphk#include "ccp.h" 4536285Sbrian#include "link.h" 4636285Sbrian#include "descriptor.h" 4743888Sbrian#include "chap.h" 4836285Sbrian#include "physical.h" 4936285Sbrian#include "prompt.h" 5036285Sbrian#include "chat.h" 5136285Sbrian#include "mp.h" 5238174Sbrian#include "cbcp.h" 5336285Sbrian#include "datalink.h" 546059Samurai 5537210Sbrianstatic u_int16_t const fcstab[256] = { 5628679Sbrian /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 5728679Sbrian /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 5828679Sbrian /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 5928679Sbrian /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 6028679Sbrian /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 6128679Sbrian /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 6228679Sbrian /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 6328679Sbrian /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 6428679Sbrian /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 6528679Sbrian /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 6628679Sbrian /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 6728679Sbrian /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 6828679Sbrian /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 6928679Sbrian /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 7028679Sbrian /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 7128679Sbrian /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 7228679Sbrian /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 7328679Sbrian /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 7428679Sbrian /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 7528679Sbrian /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 7628679Sbrian /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 7728679Sbrian /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 7828679Sbrian /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 7928679Sbrian /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 8028679Sbrian /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 8128679Sbrian /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 8228679Sbrian /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 8328679Sbrian /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 8428679Sbrian /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 8528679Sbrian /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 8628679Sbrian /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 8728679Sbrian /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 886059Samurai}; 896059Samurai 906059Samuraivoid 9136285Sbrianhdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 926059Samurai{ 9336285Sbrian memset(hdlc, '\0', sizeof(struct hdlc)); 9436285Sbrian hdlc->lqm.owner = lcp; 956059Samurai} 966059Samurai 976059Samurai/* 986059Samurai * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 996059Samurai * 2.27 for further details. 1006059Samurai */ 10146686Sbrianu_short 10246686Sbrianhdlc_Fcs(u_char *cp, size_t len) 1036059Samurai{ 10446686Sbrian u_short fcs = INITFCS; 10546686Sbrian 1066059Samurai while (len--) 1076059Samurai fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 10846686Sbrian 10946686Sbrian return fcs; 1106059Samurai} 1116059Samurai 11232663Sbrianstatic inline u_short 11331514SbrianHdlcFcsBuf(u_short fcs, struct mbuf *m) 11431514Sbrian{ 11531514Sbrian int len; 11631514Sbrian u_char *pos, *end; 11731514Sbrian 11854912Sbrian len = m_length(m); 11931514Sbrian pos = MBUF_CTOP(m); 12054912Sbrian end = pos + m->m_len; 12131514Sbrian while (len--) { 12231514Sbrian fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 12331514Sbrian if (pos == end && len) { 12454912Sbrian m = m->m_next; 12531514Sbrian pos = MBUF_CTOP(m); 12654912Sbrian end = pos + m->m_len; 12731514Sbrian } 12831514Sbrian } 12931514Sbrian return (fcs); 13031514Sbrian} 13131514Sbrian 13246686Sbrianint 13346686Sbrianhdlc_WrapperOctets(struct lcp *lcp, u_short proto) 1346059Samurai{ 13546686Sbrian return 2; 13646686Sbrian} 13746686Sbrian 13846686Sbrianstatic struct mbuf * 13946686Sbrianhdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 14046686Sbrian int pri, u_short *proto) 14146686Sbrian{ 14246686Sbrian struct mbuf *last; 1436059Samurai u_char *cp; 1446059Samurai u_short fcs; 1456059Samurai 14654912Sbrian m_settype(bp, MB_HDLCOUT); 14746686Sbrian fcs = HdlcFcsBuf(INITFCS, bp); 14846686Sbrian fcs = ~fcs; 14931514Sbrian 15054912Sbrian for (last = bp; last->m_next; last = last->m_next) 15146686Sbrian ; 15228679Sbrian 15354912Sbrian if (last->m_size - last->m_offset - last->m_len >= 2) { 15454912Sbrian cp = MBUF_CTOP(last) + last->m_len; 15554912Sbrian last->m_len += 2; 1566059Samurai } else { 15754912Sbrian struct mbuf *tail = m_get(2, MB_HDLCOUT); 15854912Sbrian last->m_next = tail; 15946686Sbrian cp = MBUF_CTOP(tail); 1606059Samurai } 16136285Sbrian 16246686Sbrian *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 16346686Sbrian *cp++ = fcs >> 8; 16436285Sbrian 16546686Sbrian log_DumpBp(LogHDLC, "hdlc_Output", bp); 16636285Sbrian 16746686Sbrian return bp; 1686059Samurai} 1696059Samurai 17031537Sbrian/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 17131537Sbrianstatic struct { 17231537Sbrian u_short from; 17331537Sbrian u_short to; 17431537Sbrian const char *name; 17531537Sbrian} protocols[] = { 17631537Sbrian { 0x0001, 0x0001, "Padding Protocol" }, 17731537Sbrian { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 17831537Sbrian { 0x0021, 0x0021, "Internet Protocol" }, 17931537Sbrian { 0x0023, 0x0023, "OSI Network Layer" }, 18031537Sbrian { 0x0025, 0x0025, "Xerox NS IDP" }, 18131537Sbrian { 0x0027, 0x0027, "DECnet Phase IV" }, 18231537Sbrian { 0x0029, 0x0029, "Appletalk" }, 18331537Sbrian { 0x002b, 0x002b, "Novell IPX" }, 18431537Sbrian { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 18531537Sbrian { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 18631537Sbrian { 0x0031, 0x0031, "Bridging PDU" }, 18731537Sbrian { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 18831537Sbrian { 0x0035, 0x0035, "Banyan Vines" }, 18931537Sbrian { 0x0037, 0x0037, "reserved (until 1993)" }, 19031537Sbrian { 0x0039, 0x0039, "AppleTalk EDDP" }, 19131537Sbrian { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 19231537Sbrian { 0x003d, 0x003d, "Multi-Link" }, 19331537Sbrian { 0x003f, 0x003f, "NETBIOS Framing" }, 19431537Sbrian { 0x0041, 0x0041, "Cisco Systems" }, 19531537Sbrian { 0x0043, 0x0043, "Ascom Timeplex" }, 19631537Sbrian { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 19731537Sbrian { 0x0047, 0x0047, "DCA Remote Lan" }, 19831537Sbrian { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 19931537Sbrian { 0x004b, 0x004b, "SNA over 802.2" }, 20031537Sbrian { 0x004d, 0x004d, "SNA" }, 20131537Sbrian { 0x004f, 0x004f, "IP6 Header Compression" }, 20231537Sbrian { 0x0051, 0x0051, "KNX Bridging Data" }, 20331537Sbrian { 0x0053, 0x0053, "Encryption" }, 20431537Sbrian { 0x0055, 0x0055, "Individual Link Encryption" }, 20531537Sbrian { 0x006f, 0x006f, "Stampede Bridging" }, 20631537Sbrian { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 20731537Sbrian { 0x0073, 0x0073, "MP+ Protocol" }, 20831537Sbrian { 0x007d, 0x007d, "reserved (Control Escape)" }, 20931537Sbrian { 0x007f, 0x007f, "reserved (compression inefficient)" }, 21031537Sbrian { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 21131537Sbrian { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 21231537Sbrian { 0x00fd, 0x00fd, "1st choice compression" }, 21331537Sbrian { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 21431537Sbrian { 0x0200, 0x02ff, "(compression inefficient)" }, 21531537Sbrian { 0x0201, 0x0201, "802.1d Hello Packets" }, 21631537Sbrian { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 21731537Sbrian { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 21831537Sbrian { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 21931537Sbrian { 0x0209, 0x0209, "Netcs Twin Routing" }, 22031537Sbrian { 0x0231, 0x0231, "Luxcom" }, 22131537Sbrian { 0x0233, 0x0233, "Sigma Network Systems" }, 22231537Sbrian { 0x0235, 0x0235, "Apple Client Server Protocol" }, 22331537Sbrian { 0x1e00, 0x1eff, "(compression inefficient)" }, 22431537Sbrian { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 22531537Sbrian { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 22631537Sbrian { 0x4021, 0x4021, "Stacker LZS" }, 22731537Sbrian { 0x8001, 0x801f, "Not Used - reserved" }, 22831537Sbrian { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 22931537Sbrian { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 23031537Sbrian { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 23131537Sbrian { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 23231537Sbrian { 0x8029, 0x8029, "Appletalk Control Protocol" }, 23331537Sbrian { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 23431537Sbrian { 0x802d, 0x802d, "reserved" }, 23531537Sbrian { 0x802f, 0x802f, "reserved" }, 23631537Sbrian { 0x8031, 0x8031, "Bridging NCP" }, 23731537Sbrian { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 23831537Sbrian { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 23931537Sbrian { 0x8037, 0x8037, "reserved till 1993" }, 24031537Sbrian { 0x8039, 0x8039, "reserved" }, 24131537Sbrian { 0x803b, 0x803b, "reserved" }, 24231537Sbrian { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 24331537Sbrian { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 24431537Sbrian { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 24531537Sbrian { 0x8043, 0x8043, "Ascom Timeplex" }, 24631537Sbrian { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 24731537Sbrian { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 24831537Sbrian { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 24931537Sbrian { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 25031537Sbrian { 0x804d, 0x804d, "SNA Control Protocol" }, 25131537Sbrian { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 25231537Sbrian { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 25331537Sbrian { 0x8053, 0x8053, "Encryption Control Protocol" }, 25431537Sbrian { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 25531537Sbrian { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 25631537Sbrian { 0x8073, 0x8073, "MP+ Control Protocol" }, 25731537Sbrian { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 25831537Sbrian { 0x807d, 0x807d, "Not Used - reserved" }, 25931537Sbrian { 0x80cf, 0x80cf, "Not Used - reserved" }, 26031537Sbrian { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 26131537Sbrian { 0x80fd, 0x80fd, "Compression Control Protocol" }, 26231537Sbrian { 0x80ff, 0x80ff, "Not Used - reserved" }, 26331537Sbrian { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 26431537Sbrian { 0x8209, 0x8209, "Netcs Twin Routing" }, 26531537Sbrian { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 26631537Sbrian { 0xc021, 0xc021, "Link Control Protocol" }, 26731537Sbrian { 0xc023, 0xc023, "Password Authentication Protocol" }, 26831537Sbrian { 0xc025, 0xc025, "Link Quality Report" }, 26931537Sbrian { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 27031537Sbrian { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 27131537Sbrian { 0xc081, 0xc081, "Container Control Protocol" }, 27231537Sbrian { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 27331537Sbrian { 0xc225, 0xc225, "RSA Authentication Protocol" }, 27431537Sbrian { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 27531537Sbrian { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 27631537Sbrian { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 27731537Sbrian { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 27831537Sbrian { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 27931537Sbrian}; 28031537Sbrian 28131962Sbrian#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 28231537Sbrian 28336285Sbrianconst char * 28436285Sbrianhdlc_Protocol2Nam(u_short proto) 28531537Sbrian{ 28631537Sbrian int f; 28731537Sbrian 28831537Sbrian for (f = 0; f < NPROTOCOLS; f++) 28931537Sbrian if (proto >= protocols[f].from && proto <= protocols[f].to) 29031537Sbrian return protocols[f].name; 29131537Sbrian else if (proto < protocols[f].from) 29231537Sbrian break; 29331537Sbrian return "unrecognised protocol"; 29431537Sbrian} 29531537Sbrian 29646686Sbrianstatic struct mbuf * 29746686Sbrianhdlc_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, 29846686Sbrian u_short *proto) 2996059Samurai{ 30036285Sbrian struct physical *p = link2physical(l); 30146686Sbrian u_short fcs; 30246686Sbrian int len; 3039448Samurai 30446686Sbrian if (!p) { 30546686Sbrian log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 30646686Sbrian return bp; 3076059Samurai } 3086059Samurai 30954912Sbrian log_DumpBp(LogHDLC, "hdlc_LayerPull:", bp); 3106059Samurai 31154912Sbrian fcs = hdlc_Fcs(MBUF_CTOP(bp), bp->m_len); 3126059Samurai 31354912Sbrian log_Printf(LogDEBUG, "%s: hdlc_LayerPull: fcs = %04x (%s)\n", 31446686Sbrian p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 3156059Samurai 3166059Samurai if (fcs != GOODFCS) { 31746686Sbrian p->hdlc.lqm.SaveInErrors++; 31846686Sbrian p->hdlc.stats.badfcs++; 31954912Sbrian m_freem(bp); 32046686Sbrian return NULL; 3216059Samurai } 32225019Sphk 32354912Sbrian p->hdlc.lqm.SaveInOctets += bp->m_len + 1; 32446686Sbrian p->hdlc.lqm.SaveInPackets++; 32546686Sbrian 32654912Sbrian len = m_length(bp); 32746686Sbrian if (len < 4) { /* rfc1662 section 4.3 */ 32854912Sbrian m_freem(bp); 32946686Sbrian bp = NULL; 33025019Sphk } 3316059Samurai 33254912Sbrian bp = m_adj(bp, -2); /* discard the FCS */ 33354912Sbrian m_settype(bp, MB_HDLCIN); 3346059Samurai 33546686Sbrian return bp; 33636285Sbrian} 33736285Sbrian 33847695Sbrian/* Detect a HDLC frame */ 33936285Sbrian 34045264Sbrianstatic const struct frameheader { 34145264Sbrian const u_char *data; 34245264Sbrian int len; 34345264Sbrian} FrameHeaders[] = { 34445264Sbrian { "\176\377\003\300\041", 5 }, 34545264Sbrian { "\176\377\175\043\300\041", 6 }, 34645264Sbrian { "\176\177\175\043\100\041", 6 }, 34745264Sbrian { "\176\175\337\175\043\300\041", 7 }, 34845264Sbrian { "\176\175\137\175\043\100\041", 7 }, 34945264Sbrian { NULL, 0 } 35036285Sbrian}; 35136285Sbrian 35245264Sbrianint 35345264Sbrianhdlc_Detect(u_char const **cp, int n, int issync) 35436285Sbrian{ 35545264Sbrian const struct frameheader *fh; 35645264Sbrian const u_char *h; 35745264Sbrian size_t len, cmp; 35836285Sbrian 35945264Sbrian while (n) { 36045264Sbrian for (fh = FrameHeaders; fh->len; fh++) { 36145264Sbrian h = issync ? fh->data + 1 : fh->data; 36245264Sbrian len = issync ? fh->len - 1 : fh->len; 36345264Sbrian cmp = n >= len ? len : n; 36445264Sbrian if (memcmp(*cp, h, cmp) == 0) 36545264Sbrian return cmp == len; 36645264Sbrian } 36745264Sbrian n--; 36845264Sbrian (*cp)++; 36936285Sbrian } 37045264Sbrian 37145264Sbrian return 0; 37236285Sbrian} 3736059Samurai 37436285Sbrianint 37536285Sbrianhdlc_ReportStatus(struct cmdargs const *arg) 37636285Sbrian{ 37736285Sbrian struct hdlc *hdlc = &arg->cx->physical->hdlc; 37836285Sbrian 37936285Sbrian prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 38036285Sbrian prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 38136285Sbrian hdlc->stats.badfcs); 38236285Sbrian prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 38336285Sbrian HDLC_ADDR, hdlc->stats.badaddr); 38436285Sbrian prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 38536285Sbrian HDLC_UI, hdlc->stats.badcommand); 38636285Sbrian prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 38736285Sbrian hdlc->stats.unknownproto); 38836285Sbrian return 0; 3896059Samurai} 39036285Sbrian 39136285Sbrianstatic void 39236285Sbrianhdlc_ReportTime(void *v) 39336285Sbrian{ 39436285Sbrian /* Moan about HDLC errors */ 39536285Sbrian struct hdlc *hdlc = (struct hdlc *)v; 39636285Sbrian 39736285Sbrian timer_Stop(&hdlc->ReportTimer); 39836285Sbrian 39936285Sbrian if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 40036285Sbrian log_Printf(LogPHASE, 40136285Sbrian "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 40236285Sbrian hdlc->lqm.owner->fsm.link->name, 40336285Sbrian hdlc->stats.badfcs - hdlc->laststats.badfcs, 40436285Sbrian hdlc->stats.badaddr - hdlc->laststats.badaddr, 40536285Sbrian hdlc->stats.badcommand - hdlc->laststats.badcommand, 40636285Sbrian hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 40736285Sbrian hdlc->laststats = hdlc->stats; 40836285Sbrian } 40936285Sbrian 41036285Sbrian timer_Start(&hdlc->ReportTimer); 41136285Sbrian} 41236285Sbrian 41336285Sbrianvoid 41436285Sbrianhdlc_StartTimer(struct hdlc *hdlc) 41536285Sbrian{ 41636285Sbrian timer_Stop(&hdlc->ReportTimer); 41736285Sbrian hdlc->ReportTimer.load = 60 * SECTICKS; 41836285Sbrian hdlc->ReportTimer.arg = hdlc; 41936285Sbrian hdlc->ReportTimer.func = hdlc_ReportTime; 42036285Sbrian hdlc->ReportTimer.name = "hdlc"; 42136285Sbrian timer_Start(&hdlc->ReportTimer); 42236285Sbrian} 42336285Sbrian 42436285Sbrianvoid 42536285Sbrianhdlc_StopTimer(struct hdlc *hdlc) 42636285Sbrian{ 42736285Sbrian timer_Stop(&hdlc->ReportTimer); 42836285Sbrian} 42946686Sbrian 43046686Sbrianstruct layer hdlclayer = { LAYER_HDLC, "hdlc", hdlc_LayerPush, hdlc_LayerPull }; 431