hdlc.c revision 131327
178189Sbrian/*- 278189Sbrian * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 378189Sbrian * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 478189Sbrian * Internet Initiative Japan, Inc (IIJ) 578189Sbrian * All rights reserved. 66059Samurai * 778189Sbrian * Redistribution and use in source and binary forms, with or without 878189Sbrian * modification, are permitted provided that the following conditions 978189Sbrian * are met: 1078189Sbrian * 1. Redistributions of source code must retain the above copyright 1178189Sbrian * notice, this list of conditions and the following disclaimer. 1278189Sbrian * 2. Redistributions in binary form must reproduce the above copyright 1378189Sbrian * notice, this list of conditions and the following disclaimer in the 1478189Sbrian * documentation and/or other materials provided with the distribution. 156059Samurai * 1678189Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1778189Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1878189Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1978189Sbrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2078189Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2178189Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2278189Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2378189Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2478189Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2578189Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2678189Sbrian * SUCH DAMAGE. 276059Samurai * 2850479Speter * $FreeBSD: head/usr.sbin/ppp/hdlc.c 131327 2004-06-30 12:24:56Z brian $ 296059Samurai */ 3078189Sbrian 3143313Sbrian#include <sys/param.h> 3236285Sbrian#include <sys/un.h> 3330715Sbrian 34102500Sbrian#include <stdarg.h> 3530715Sbrian#include <stdio.h> 3630715Sbrian#include <string.h> 3730715Sbrian#include <termios.h> 3830715Sbrian 3937009Sbrian#include "defs.h" 4046686Sbrian#include "layer.h" 4131343Sbrian#include "command.h" 4230715Sbrian#include "mbuf.h" 4330715Sbrian#include "log.h" 4430715Sbrian#include "timer.h" 456059Samurai#include "fsm.h" 4636285Sbrian#include "lqr.h" 476059Samurai#include "hdlc.h" 4836285Sbrian#include "throughput.h" 4936285Sbrian#include "auth.h" 506059Samurai#include "lcp.h" 5131343Sbrian#include "async.h" 5213389Sphk#include "ccp.h" 5336285Sbrian#include "link.h" 5436285Sbrian#include "descriptor.h" 5543888Sbrian#include "chap.h" 5636285Sbrian#include "physical.h" 5736285Sbrian#include "prompt.h" 5836285Sbrian#include "chat.h" 5936285Sbrian#include "mp.h" 6038174Sbrian#include "cbcp.h" 6136285Sbrian#include "datalink.h" 626059Samurai 6337210Sbrianstatic u_int16_t const fcstab[256] = { 6428679Sbrian /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 6528679Sbrian /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 6628679Sbrian /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 6728679Sbrian /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 6828679Sbrian /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 6928679Sbrian /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 7028679Sbrian /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 7128679Sbrian /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 7228679Sbrian /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 7328679Sbrian /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 7428679Sbrian /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 7528679Sbrian /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 7628679Sbrian /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 7728679Sbrian /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 7828679Sbrian /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 7928679Sbrian /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 8028679Sbrian /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 8128679Sbrian /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 8228679Sbrian /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 8328679Sbrian /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 8428679Sbrian /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 8528679Sbrian /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 8628679Sbrian /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 8728679Sbrian /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 8828679Sbrian /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 8928679Sbrian /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 9028679Sbrian /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 9128679Sbrian /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 9228679Sbrian /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 9328679Sbrian /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 9428679Sbrian /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 9528679Sbrian /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 966059Samurai}; 976059Samurai 986059Samuraivoid 9936285Sbrianhdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 1006059Samurai{ 10136285Sbrian memset(hdlc, '\0', sizeof(struct hdlc)); 10236285Sbrian hdlc->lqm.owner = lcp; 1036059Samurai} 1046059Samurai 1056059Samurai/* 1066059Samurai * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 1076059Samurai * 2.27 for further details. 1086059Samurai */ 10946686Sbrianu_short 11046686Sbrianhdlc_Fcs(u_char *cp, size_t len) 1116059Samurai{ 11246686Sbrian u_short fcs = INITFCS; 11346686Sbrian 1146059Samurai while (len--) 1156059Samurai fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 11646686Sbrian 11746686Sbrian return fcs; 1186059Samurai} 1196059Samurai 12032663Sbrianstatic inline u_short 12131514SbrianHdlcFcsBuf(u_short fcs, struct mbuf *m) 12231514Sbrian{ 12331514Sbrian int len; 12431514Sbrian u_char *pos, *end; 12531514Sbrian 12654912Sbrian len = m_length(m); 12731514Sbrian pos = MBUF_CTOP(m); 12854912Sbrian end = pos + m->m_len; 12931514Sbrian while (len--) { 13031514Sbrian fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 13131514Sbrian if (pos == end && len) { 13254912Sbrian m = m->m_next; 13331514Sbrian pos = MBUF_CTOP(m); 13454912Sbrian end = pos + m->m_len; 13531514Sbrian } 13631514Sbrian } 13731514Sbrian return (fcs); 13831514Sbrian} 13931514Sbrian 14046686Sbrianint 14146686Sbrianhdlc_WrapperOctets(struct lcp *lcp, u_short proto) 1426059Samurai{ 14346686Sbrian return 2; 14446686Sbrian} 14546686Sbrian 14646686Sbrianstatic struct mbuf * 14746686Sbrianhdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 14846686Sbrian int pri, u_short *proto) 14946686Sbrian{ 15046686Sbrian struct mbuf *last; 1516059Samurai u_char *cp; 1526059Samurai u_short fcs; 1536059Samurai 15454912Sbrian m_settype(bp, MB_HDLCOUT); 15546686Sbrian fcs = HdlcFcsBuf(INITFCS, bp); 15646686Sbrian fcs = ~fcs; 15731514Sbrian 15854912Sbrian for (last = bp; last->m_next; last = last->m_next) 15946686Sbrian ; 16028679Sbrian 16154912Sbrian if (last->m_size - last->m_offset - last->m_len >= 2) { 16254912Sbrian cp = MBUF_CTOP(last) + last->m_len; 16354912Sbrian last->m_len += 2; 1646059Samurai } else { 16554912Sbrian struct mbuf *tail = m_get(2, MB_HDLCOUT); 16654912Sbrian last->m_next = tail; 16746686Sbrian cp = MBUF_CTOP(tail); 1686059Samurai } 16936285Sbrian 17046686Sbrian *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 17146686Sbrian *cp++ = fcs >> 8; 17236285Sbrian 17346686Sbrian log_DumpBp(LogHDLC, "hdlc_Output", bp); 17436285Sbrian 17546686Sbrian return bp; 1766059Samurai} 1776059Samurai 17831537Sbrian/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 17931537Sbrianstatic struct { 18031537Sbrian u_short from; 18131537Sbrian u_short to; 18231537Sbrian const char *name; 18331537Sbrian} protocols[] = { 18431537Sbrian { 0x0001, 0x0001, "Padding Protocol" }, 18531537Sbrian { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 18631537Sbrian { 0x0021, 0x0021, "Internet Protocol" }, 18731537Sbrian { 0x0023, 0x0023, "OSI Network Layer" }, 18831537Sbrian { 0x0025, 0x0025, "Xerox NS IDP" }, 18931537Sbrian { 0x0027, 0x0027, "DECnet Phase IV" }, 19031537Sbrian { 0x0029, 0x0029, "Appletalk" }, 19131537Sbrian { 0x002b, 0x002b, "Novell IPX" }, 19231537Sbrian { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 19331537Sbrian { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 19431537Sbrian { 0x0031, 0x0031, "Bridging PDU" }, 19531537Sbrian { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 19631537Sbrian { 0x0035, 0x0035, "Banyan Vines" }, 19731537Sbrian { 0x0037, 0x0037, "reserved (until 1993)" }, 19831537Sbrian { 0x0039, 0x0039, "AppleTalk EDDP" }, 19931537Sbrian { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 20031537Sbrian { 0x003d, 0x003d, "Multi-Link" }, 20131537Sbrian { 0x003f, 0x003f, "NETBIOS Framing" }, 20231537Sbrian { 0x0041, 0x0041, "Cisco Systems" }, 20331537Sbrian { 0x0043, 0x0043, "Ascom Timeplex" }, 20431537Sbrian { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 20531537Sbrian { 0x0047, 0x0047, "DCA Remote Lan" }, 20631537Sbrian { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 20731537Sbrian { 0x004b, 0x004b, "SNA over 802.2" }, 20831537Sbrian { 0x004d, 0x004d, "SNA" }, 20931537Sbrian { 0x004f, 0x004f, "IP6 Header Compression" }, 21031537Sbrian { 0x0051, 0x0051, "KNX Bridging Data" }, 21131537Sbrian { 0x0053, 0x0053, "Encryption" }, 21231537Sbrian { 0x0055, 0x0055, "Individual Link Encryption" }, 21381634Sbrian { 0x0057, 0x0057, "Internet Protocol V6" }, 21431537Sbrian { 0x006f, 0x006f, "Stampede Bridging" }, 21531537Sbrian { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 21631537Sbrian { 0x0073, 0x0073, "MP+ Protocol" }, 21731537Sbrian { 0x007d, 0x007d, "reserved (Control Escape)" }, 21831537Sbrian { 0x007f, 0x007f, "reserved (compression inefficient)" }, 21931537Sbrian { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 22031537Sbrian { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 22131537Sbrian { 0x00fd, 0x00fd, "1st choice compression" }, 22231537Sbrian { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 22331537Sbrian { 0x0200, 0x02ff, "(compression inefficient)" }, 22431537Sbrian { 0x0201, 0x0201, "802.1d Hello Packets" }, 22531537Sbrian { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 22631537Sbrian { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 22731537Sbrian { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 22831537Sbrian { 0x0209, 0x0209, "Netcs Twin Routing" }, 22931537Sbrian { 0x0231, 0x0231, "Luxcom" }, 23031537Sbrian { 0x0233, 0x0233, "Sigma Network Systems" }, 23131537Sbrian { 0x0235, 0x0235, "Apple Client Server Protocol" }, 23231537Sbrian { 0x1e00, 0x1eff, "(compression inefficient)" }, 23331537Sbrian { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 23431537Sbrian { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 23531537Sbrian { 0x4021, 0x4021, "Stacker LZS" }, 23631537Sbrian { 0x8001, 0x801f, "Not Used - reserved" }, 23731537Sbrian { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 23831537Sbrian { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 23931537Sbrian { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 24031537Sbrian { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 24131537Sbrian { 0x8029, 0x8029, "Appletalk Control Protocol" }, 24231537Sbrian { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 24331537Sbrian { 0x802d, 0x802d, "reserved" }, 24431537Sbrian { 0x802f, 0x802f, "reserved" }, 24531537Sbrian { 0x8031, 0x8031, "Bridging NCP" }, 24631537Sbrian { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 24731537Sbrian { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 24831537Sbrian { 0x8037, 0x8037, "reserved till 1993" }, 24931537Sbrian { 0x8039, 0x8039, "reserved" }, 25031537Sbrian { 0x803b, 0x803b, "reserved" }, 25131537Sbrian { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 25231537Sbrian { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 25331537Sbrian { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 25431537Sbrian { 0x8043, 0x8043, "Ascom Timeplex" }, 25531537Sbrian { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 25631537Sbrian { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 25731537Sbrian { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 25831537Sbrian { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 25931537Sbrian { 0x804d, 0x804d, "SNA Control Protocol" }, 26031537Sbrian { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 26131537Sbrian { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 26231537Sbrian { 0x8053, 0x8053, "Encryption Control Protocol" }, 26331537Sbrian { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 26481634Sbrian { 0x8057, 0x8057, "Internet Protocol V6 Control Protocol" }, 26531537Sbrian { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 26631537Sbrian { 0x8073, 0x8073, "MP+ Control Protocol" }, 26731537Sbrian { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 26831537Sbrian { 0x807d, 0x807d, "Not Used - reserved" }, 26931537Sbrian { 0x80cf, 0x80cf, "Not Used - reserved" }, 27031537Sbrian { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 27131537Sbrian { 0x80fd, 0x80fd, "Compression Control Protocol" }, 27231537Sbrian { 0x80ff, 0x80ff, "Not Used - reserved" }, 27331537Sbrian { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 27431537Sbrian { 0x8209, 0x8209, "Netcs Twin Routing" }, 27531537Sbrian { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 27631537Sbrian { 0xc021, 0xc021, "Link Control Protocol" }, 27731537Sbrian { 0xc023, 0xc023, "Password Authentication Protocol" }, 27831537Sbrian { 0xc025, 0xc025, "Link Quality Report" }, 27931537Sbrian { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 28031537Sbrian { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 28131537Sbrian { 0xc081, 0xc081, "Container Control Protocol" }, 28231537Sbrian { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 28331537Sbrian { 0xc225, 0xc225, "RSA Authentication Protocol" }, 28431537Sbrian { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 28531537Sbrian { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 28631537Sbrian { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 28731537Sbrian { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 28831537Sbrian { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 28931537Sbrian}; 29031537Sbrian 29131962Sbrian#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 29231537Sbrian 29336285Sbrianconst char * 29436285Sbrianhdlc_Protocol2Nam(u_short proto) 29531537Sbrian{ 29631537Sbrian int f; 29731537Sbrian 29831537Sbrian for (f = 0; f < NPROTOCOLS; f++) 29931537Sbrian if (proto >= protocols[f].from && proto <= protocols[f].to) 30031537Sbrian return protocols[f].name; 30131537Sbrian else if (proto < protocols[f].from) 30231537Sbrian break; 30331537Sbrian return "unrecognised protocol"; 30431537Sbrian} 30531537Sbrian 30646686Sbrianstatic struct mbuf * 30746686Sbrianhdlc_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, 30846686Sbrian u_short *proto) 3096059Samurai{ 31036285Sbrian struct physical *p = link2physical(l); 31146686Sbrian u_short fcs; 31246686Sbrian int len; 3139448Samurai 31446686Sbrian if (!p) { 31546686Sbrian log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 31646686Sbrian return bp; 3176059Samurai } 3186059Samurai 31954912Sbrian log_DumpBp(LogHDLC, "hdlc_LayerPull:", bp); 3206059Samurai 321131327Sbrian bp = m_pullup(bp); 322131327Sbrian len = m_length(bp); 323131327Sbrian fcs = hdlc_Fcs(MBUF_CTOP(bp), len); 3246059Samurai 32554912Sbrian log_Printf(LogDEBUG, "%s: hdlc_LayerPull: fcs = %04x (%s)\n", 32646686Sbrian p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 3276059Samurai 328131327Sbrian p->hdlc.lqm.ifInOctets += len + 1; /* plus 1 flag octet! */ 329131327Sbrian 3306059Samurai if (fcs != GOODFCS) { 331131327Sbrian p->hdlc.lqm.ifInErrors++; 33246686Sbrian p->hdlc.stats.badfcs++; 33354912Sbrian m_freem(bp); 33446686Sbrian return NULL; 3356059Samurai } 33625019Sphk 337131327Sbrian /* Either done here or by the sync layer */ 338131327Sbrian p->hdlc.lqm.lqr.InGoodOctets += len + 1; /* plus 1 flag octet! */ 339131327Sbrian p->hdlc.lqm.ifInUniPackets++; 34046686Sbrian 34146686Sbrian if (len < 4) { /* rfc1662 section 4.3 */ 34254912Sbrian m_freem(bp); 34346686Sbrian bp = NULL; 34425019Sphk } 3456059Samurai 34654912Sbrian bp = m_adj(bp, -2); /* discard the FCS */ 34754912Sbrian m_settype(bp, MB_HDLCIN); 3486059Samurai 34946686Sbrian return bp; 35036285Sbrian} 35136285Sbrian 35247695Sbrian/* Detect a HDLC frame */ 35336285Sbrian 35445264Sbrianstatic const struct frameheader { 35545264Sbrian const u_char *data; 35645264Sbrian int len; 35745264Sbrian} FrameHeaders[] = { 35845264Sbrian { "\176\377\003\300\041", 5 }, 35945264Sbrian { "\176\377\175\043\300\041", 6 }, 36045264Sbrian { "\176\177\175\043\100\041", 6 }, 36145264Sbrian { "\176\175\337\175\043\300\041", 7 }, 36245264Sbrian { "\176\175\137\175\043\100\041", 7 }, 36345264Sbrian { NULL, 0 } 36436285Sbrian}; 36536285Sbrian 36645264Sbrianint 36745264Sbrianhdlc_Detect(u_char const **cp, int n, int issync) 36836285Sbrian{ 36945264Sbrian const struct frameheader *fh; 37045264Sbrian const u_char *h; 37145264Sbrian size_t len, cmp; 37236285Sbrian 37345264Sbrian while (n) { 37445264Sbrian for (fh = FrameHeaders; fh->len; fh++) { 37545264Sbrian h = issync ? fh->data + 1 : fh->data; 37645264Sbrian len = issync ? fh->len - 1 : fh->len; 37745264Sbrian cmp = n >= len ? len : n; 37845264Sbrian if (memcmp(*cp, h, cmp) == 0) 37945264Sbrian return cmp == len; 38045264Sbrian } 38145264Sbrian n--; 38245264Sbrian (*cp)++; 38336285Sbrian } 38445264Sbrian 38545264Sbrian return 0; 38636285Sbrian} 3876059Samurai 38836285Sbrianint 38936285Sbrianhdlc_ReportStatus(struct cmdargs const *arg) 39036285Sbrian{ 39136285Sbrian struct hdlc *hdlc = &arg->cx->physical->hdlc; 39236285Sbrian 39336285Sbrian prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 39436285Sbrian prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 39536285Sbrian hdlc->stats.badfcs); 39636285Sbrian prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 39736285Sbrian HDLC_ADDR, hdlc->stats.badaddr); 39836285Sbrian prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 39936285Sbrian HDLC_UI, hdlc->stats.badcommand); 40036285Sbrian prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 40136285Sbrian hdlc->stats.unknownproto); 40236285Sbrian return 0; 4036059Samurai} 40436285Sbrian 40536285Sbrianstatic void 40636285Sbrianhdlc_ReportTime(void *v) 40736285Sbrian{ 40836285Sbrian /* Moan about HDLC errors */ 40936285Sbrian struct hdlc *hdlc = (struct hdlc *)v; 41036285Sbrian 41136285Sbrian timer_Stop(&hdlc->ReportTimer); 41236285Sbrian 41336285Sbrian if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 41436285Sbrian log_Printf(LogPHASE, 41536285Sbrian "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 41636285Sbrian hdlc->lqm.owner->fsm.link->name, 41736285Sbrian hdlc->stats.badfcs - hdlc->laststats.badfcs, 41836285Sbrian hdlc->stats.badaddr - hdlc->laststats.badaddr, 41936285Sbrian hdlc->stats.badcommand - hdlc->laststats.badcommand, 42036285Sbrian hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 42136285Sbrian hdlc->laststats = hdlc->stats; 42236285Sbrian } 42336285Sbrian 42436285Sbrian timer_Start(&hdlc->ReportTimer); 42536285Sbrian} 42636285Sbrian 42736285Sbrianvoid 42836285Sbrianhdlc_StartTimer(struct hdlc *hdlc) 42936285Sbrian{ 43036285Sbrian timer_Stop(&hdlc->ReportTimer); 43136285Sbrian hdlc->ReportTimer.load = 60 * SECTICKS; 43236285Sbrian hdlc->ReportTimer.arg = hdlc; 43336285Sbrian hdlc->ReportTimer.func = hdlc_ReportTime; 43436285Sbrian hdlc->ReportTimer.name = "hdlc"; 43536285Sbrian timer_Start(&hdlc->ReportTimer); 43636285Sbrian} 43736285Sbrian 43836285Sbrianvoid 43936285Sbrianhdlc_StopTimer(struct hdlc *hdlc) 44036285Sbrian{ 44136285Sbrian timer_Stop(&hdlc->ReportTimer); 44236285Sbrian} 44346686Sbrian 44446686Sbrianstruct layer hdlclayer = { LAYER_HDLC, "hdlc", hdlc_LayerPush, hdlc_LayerPull }; 445