hdlc.c revision 134789
1116742Ssam/*- 2116904Ssam * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3170360Ssam * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4116742Ssam * Internet Initiative Japan, Inc (IIJ) 5116742Ssam * All rights reserved. 6116742Ssam * 7116742Ssam * Redistribution and use in source and binary forms, with or without 8116742Ssam * modification, are permitted provided that the following conditions 9116742Ssam * are met: 10116904Ssam * 1. Redistributions of source code must retain the above copyright 11116904Ssam * notice, this list of conditions and the following disclaimer. 12116904Ssam * 2. Redistributions in binary form must reproduce the above copyright 13116904Ssam * notice, this list of conditions and the following disclaimer in the 14116742Ssam * documentation and/or other materials provided with the distribution. 15116904Ssam * 16116904Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17116904Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18116904Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19116904Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20116904Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21116904Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22116904Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23116904Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24116904Ssam * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25116742Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26116742Ssam * SUCH DAMAGE. 27116742Ssam * 28116742Ssam * $FreeBSD: head/usr.sbin/ppp/hdlc.c 134789 2004-09-05 01:46:52Z brian $ 29116742Ssam */ 30116742Ssam 31116742Ssam#include <sys/param.h> 32116742Ssam#include <sys/un.h> 33116742Ssam 34116742Ssam#include <stdarg.h> 35138568Ssam#include <stdio.h> 36116742Ssam#include <string.h> 37116742Ssam#include <termios.h> 38116742Ssam 39116742Ssam#include "defs.h" 40116742Ssam#include "layer.h" 41116742Ssam#include "command.h" 42116742Ssam#include "mbuf.h" 43116742Ssam#include "log.h" 44116742Ssam#include "timer.h" 45116742Ssam#include "fsm.h" 46147221Ssam#include "lqr.h" 47147221Ssam#include "hdlc.h" 48147221Ssam#include "throughput.h" 49147221Ssam#include "auth.h" 50147221Ssam#include "lcp.h" 51147221Ssam#include "async.h" 52147221Ssam#include "ccp.h" 53147221Ssam#include "link.h" 54147221Ssam#include "descriptor.h" 55147221Ssam#include "chap.h" 56159139Sdds#include "physical.h" 57159139Sdds#include "prompt.h" 58159139Sdds#include "chat.h" 59159139Sdds#include "mp.h" 60159139Sdds#include "cbcp.h" 61159139Sdds#include "datalink.h" 62170530Ssam 63170530Ssamstatic u_int16_t const fcstab[256] = { 64138568Ssam /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 65138568Ssam /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 66138568Ssam /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 67170530Ssam /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 68170530Ssam /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 69116742Ssam /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 70138568Ssam /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 71170530Ssam /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 72138568Ssam /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 73120104Ssam /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 74138568Ssam /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 75148863Ssam /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 76170530Ssam /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 77170530Ssam /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 78138568Ssam /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 79172211Ssam /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 80138568Ssam /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 81127876Ssam /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 82120481Ssam /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 83116742Ssam /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 84138568Ssam /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 85116742Ssam /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 86116742Ssam /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 87138568Ssam /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 88138568Ssam /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 89138568Ssam /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 90138568Ssam /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 91170530Ssam /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 92138568Ssam /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 93138568Ssam /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 94138568Ssam /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 95138568Ssam /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 96138568Ssam}; 97138568Ssam 98138568Ssamvoid 99170530Ssamhdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 100170530Ssam{ 101148863Ssam memset(hdlc, '\0', sizeof(struct hdlc)); 102148863Ssam hdlc->lqm.owner = lcp; 103172062Ssam} 104172062Ssam 105148863Ssam/* 106148863Ssam * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 107148863Ssam * 2.27 for further details. 108148863Ssam */ 109148863Ssamu_short 110148863Ssamhdlc_Fcs(u_char *cp, size_t len) 111148863Ssam{ 112148863Ssam u_short fcs = INITFCS; 113138568Ssam 114170530Ssam while (len--) 115170530Ssam fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 116170530Ssam 117138568Ssam return fcs; 118138568Ssam} 119138568Ssam 120138568Ssamstatic inline u_short 121138568SsamHdlcFcsBuf(u_short fcs, struct mbuf *m) 122138568Ssam{ 123148863Ssam int len; 124170530Ssam u_char *pos, *end; 125118887Ssam 126148863Ssam len = m_length(m); 127138568Ssam pos = MBUF_CTOP(m); 128138568Ssam end = pos + m->m_len; 129138568Ssam while (len--) { 130138568Ssam fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 131148863Ssam if (pos == end && len) { 132138568Ssam m = m->m_next; 133138568Ssam pos = MBUF_CTOP(m); 134138568Ssam end = pos + m->m_len; 135138568Ssam } 136138568Ssam } 137138568Ssam return (fcs); 138138568Ssam} 139138568Ssam 140138568Ssamstatic struct mbuf * 141138568Ssamhdlc_LayerPush(struct bundle *bundle __unused, struct link *l __unused, 142138568Ssam struct mbuf *bp, int pri __unused, u_short *proto __unused) 143138568Ssam{ 144138568Ssam struct mbuf *last; 145138568Ssam u_char *cp; 146138568Ssam u_short fcs; 147138568Ssam 148138568Ssam m_settype(bp, MB_HDLCOUT); 149138568Ssam fcs = HdlcFcsBuf(INITFCS, bp); 150138568Ssam fcs = ~fcs; 151138568Ssam 152138568Ssam for (last = bp; last->m_next; last = last->m_next) 153138568Ssam ; 154138568Ssam 155138568Ssam if (last->m_size - last->m_offset - last->m_len >= 2) { 156138568Ssam cp = MBUF_CTOP(last) + last->m_len; 157138568Ssam last->m_len += 2; 158138568Ssam } else { 159138568Ssam struct mbuf *tail = m_get(2, MB_HDLCOUT); 160138568Ssam last->m_next = tail; 161138568Ssam cp = MBUF_CTOP(tail); 162138568Ssam } 163148863Ssam 164116742Ssam *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 165116742Ssam *cp++ = fcs >> 8; 166116742Ssam 167138568Ssam log_DumpBp(LogHDLC, "hdlc_Output", bp); 168116742Ssam 169116742Ssam return bp; 170138568Ssam} 171138568Ssam 172138568Ssam/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 173138568Ssamstatic struct { 174140753Ssam u_short from; 175138568Ssam u_short to; 176170530Ssam const char *name; 177138568Ssam} protocols[] = { 178138568Ssam { 0x0001, 0x0001, "Padding Protocol" }, 179116742Ssam { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 180116742Ssam { 0x0021, 0x0021, "Internet Protocol" }, 181138568Ssam { 0x0023, 0x0023, "OSI Network Layer" }, 182138568Ssam { 0x0025, 0x0025, "Xerox NS IDP" }, 183138568Ssam { 0x0027, 0x0027, "DECnet Phase IV" }, 184138568Ssam { 0x0029, 0x0029, "Appletalk" }, 185138568Ssam { 0x002b, 0x002b, "Novell IPX" }, 186148302Ssam { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 187138568Ssam { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 188148302Ssam { 0x0031, 0x0031, "Bridging PDU" }, 189148302Ssam { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 190138568Ssam { 0x0035, 0x0035, "Banyan Vines" }, 191139528Ssam { 0x0037, 0x0037, "reserved (until 1993)" }, 192172062Ssam { 0x0039, 0x0039, "AppleTalk EDDP" }, 193138568Ssam { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 194138568Ssam { 0x003d, 0x003d, "Multi-Link" }, 195138568Ssam { 0x003f, 0x003f, "NETBIOS Framing" }, 196148302Ssam { 0x0041, 0x0041, "Cisco Systems" }, 197138568Ssam { 0x0043, 0x0043, "Ascom Timeplex" }, 198172063Ssam { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 199172063Ssam { 0x0047, 0x0047, "DCA Remote Lan" }, 200138568Ssam { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 201172062Ssam { 0x004b, 0x004b, "SNA over 802.2" }, 202172062Ssam { 0x004d, 0x004d, "SNA" }, 203172062Ssam { 0x004f, 0x004f, "IP6 Header Compression" }, 204138568Ssam { 0x0051, 0x0051, "KNX Bridging Data" }, 205138568Ssam { 0x0053, 0x0053, "Encryption" }, 206116742Ssam { 0x0055, 0x0055, "Individual Link Encryption" }, 207138568Ssam { 0x0057, 0x0057, "Internet Protocol V6" }, 208138568Ssam { 0x006f, 0x006f, "Stampede Bridging" }, 209138568Ssam { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 210153351Ssam { 0x0073, 0x0073, "MP+ Protocol" }, 211170530Ssam { 0x007d, 0x007d, "reserved (Control Escape)" }, 212138568Ssam { 0x007f, 0x007f, "reserved (compression inefficient)" }, 213170530Ssam { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 214170530Ssam { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 215170530Ssam { 0x00fd, 0x00fd, "1st choice compression" }, 216170530Ssam { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 217170530Ssam { 0x0200, 0x02ff, "(compression inefficient)" }, 218153351Ssam { 0x0201, 0x0201, "802.1d Hello Packets" }, 219153351Ssam { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 220170530Ssam { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 221138568Ssam { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 222170530Ssam { 0x0209, 0x0209, "Netcs Twin Routing" }, 223170530Ssam { 0x0231, 0x0231, "Luxcom" }, 224170530Ssam { 0x0233, 0x0233, "Sigma Network Systems" }, 225170530Ssam { 0x0235, 0x0235, "Apple Client Server Protocol" }, 226170530Ssam { 0x1e00, 0x1eff, "(compression inefficient)" }, 227170530Ssam { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 228170530Ssam { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 229170530Ssam { 0x4021, 0x4021, "Stacker LZS" }, 230170530Ssam { 0x8001, 0x801f, "Not Used - reserved" }, 231170530Ssam { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 232165569Ssam { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 233138568Ssam { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 234138568Ssam { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 235138568Ssam { 0x8029, 0x8029, "Appletalk Control Protocol" }, 236156358Ssam { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 237156358Ssam { 0x802d, 0x802d, "reserved" }, 238156358Ssam { 0x802f, 0x802f, "reserved" }, 239156358Ssam { 0x8031, 0x8031, "Bridging NCP" }, 240156358Ssam { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 241156358Ssam { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 242156358Ssam { 0x8037, 0x8037, "reserved till 1993" }, 243156358Ssam { 0x8039, 0x8039, "reserved" }, 244156358Ssam { 0x803b, 0x803b, "reserved" }, 245156358Ssam { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 246156358Ssam { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 247156358Ssam { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 248156358Ssam { 0x8043, 0x8043, "Ascom Timeplex" }, 249156358Ssam { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 250156358Ssam { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 251156358Ssam { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 252156358Ssam { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 253156358Ssam { 0x804d, 0x804d, "SNA Control Protocol" }, 254170530Ssam { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 255156358Ssam { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 256156358Ssam { 0x8053, 0x8053, "Encryption Control Protocol" }, 257156358Ssam { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 258156358Ssam { 0x8057, 0x8057, "Internet Protocol V6 Control Protocol" }, 259156358Ssam { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 260141658Ssam { 0x8073, 0x8073, "MP+ Control Protocol" }, 261141658Ssam { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 262141658Ssam { 0x807d, 0x807d, "Not Used - reserved" }, 263141658Ssam { 0x80cf, 0x80cf, "Not Used - reserved" }, 264141658Ssam { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 265141658Ssam { 0x80fd, 0x80fd, "Compression Control Protocol" }, 266141658Ssam { 0x80ff, 0x80ff, "Not Used - reserved" }, 267141658Ssam { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 268141658Ssam { 0x8209, 0x8209, "Netcs Twin Routing" }, 269141658Ssam { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 270141658Ssam { 0xc021, 0xc021, "Link Control Protocol" }, 271116742Ssam { 0xc023, 0xc023, "Password Authentication Protocol" }, 272116742Ssam { 0xc025, 0xc025, "Link Quality Report" }, 273116742Ssam { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 274140753Ssam { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 275116742Ssam { 0xc081, 0xc081, "Container Control Protocol" }, 276116742Ssam { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 277138568Ssam { 0xc225, 0xc225, "RSA Authentication Protocol" }, 278138568Ssam { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 279138568Ssam { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 280138568Ssam { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 281138568Ssam { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 282138568Ssam { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 283138568Ssam}; 284138568Ssam 285138568Ssam#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 286140753Ssam 287140753Ssamconst char * 288140753Ssamhdlc_Protocol2Nam(u_short proto) 289140753Ssam{ 290140753Ssam unsigned f; 291140753Ssam 292140753Ssam for (f = 0; f < NPROTOCOLS; f++) 293140753Ssam if (proto >= protocols[f].from && proto <= protocols[f].to) 294140753Ssam return protocols[f].name; 295140753Ssam else if (proto < protocols[f].from) 296140753Ssam break; 297148863Ssam return "unrecognised protocol"; 298140753Ssam} 299140753Ssam 300138568Ssamstatic struct mbuf * 301138568Ssamhdlc_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp, 302116742Ssam u_short *proto __unused) 303170530Ssam{ 304170530Ssam struct physical *p = link2physical(l); 305170530Ssam u_short fcs; 306170530Ssam int len; 307148843Ssam 308138568Ssam if (!p) { 309116742Ssam log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 310116742Ssam return bp; 311116742Ssam } 312116742Ssam 313116742Ssam log_DumpBp(LogHDLC, "hdlc_LayerPull:", bp); 314138568Ssam 315138568Ssam bp = m_pullup(bp); 316138568Ssam len = m_length(bp); 317143300Ssam fcs = hdlc_Fcs(MBUF_CTOP(bp), len); 318143300Ssam 319167282Ssam log_Printf(LogDEBUG, "%s: hdlc_LayerPull: fcs = %04x (%s)\n", 320167282Ssam p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 321167282Ssam 322167282Ssam p->hdlc.lqm.ifInOctets += len + 1; /* plus 1 flag octet! */ 323167282Ssam 324153403Ssam if (fcs != GOODFCS) { 325153403Ssam p->hdlc.lqm.ifInErrors++; 326153403Ssam p->hdlc.stats.badfcs++; 327153403Ssam m_freem(bp); 328153403Ssam return NULL; 329138568Ssam } 330138568Ssam 331138568Ssam /* Either done here or by the sync layer */ 332138568Ssam p->hdlc.lqm.lqr.InGoodOctets += len + 1; /* plus 1 flag octet! */ 333170530Ssam p->hdlc.lqm.ifInUniPackets++; 334170530Ssam 335170530Ssam if (len < 4) { /* rfc1662 section 4.3 */ 336138568Ssam m_freem(bp); 337138568Ssam bp = NULL; 338138568Ssam } 339170530Ssam 340170530Ssam bp = m_adj(bp, -2); /* discard the FCS */ 341170530Ssam m_settype(bp, MB_HDLCIN); 342170530Ssam 343170530Ssam return bp; 344170530Ssam} 345170530Ssam 346170530Ssam/* Detect a HDLC frame */ 347170530Ssam 348170530Ssamstatic const struct frameheader { 349170530Ssam const u_char *data; 350170530Ssam int len; 351170530Ssam} FrameHeaders[] = { 352170530Ssam { "\176\377\003\300\041", 5 }, 353170530Ssam { "\176\377\175\043\300\041", 6 }, 354138568Ssam { "\176\177\175\043\100\041", 6 }, 355170530Ssam { "\176\175\337\175\043\300\041", 7 }, 356116742Ssam { "\176\175\137\175\043\100\041", 7 }, 357116742Ssam { NULL, 0 } 358170530Ssam}; 359170530Ssam 360170530Ssamint 361170530Ssamhdlc_Detect(u_char const **cp, unsigned n, int issync) 362170530Ssam{ 363170530Ssam const struct frameheader *fh; 364138568Ssam const u_char *h; 365138568Ssam size_t len, cmp; 366138568Ssam 367138568Ssam while (n) { 368138568Ssam for (fh = FrameHeaders; fh->len; fh++) { 369170530Ssam h = issync ? fh->data + 1 : fh->data; 370140753Ssam len = issync ? fh->len - 1 : fh->len; 371170530Ssam cmp = n >= len ? len : n; 372140753Ssam if (memcmp(*cp, h, cmp) == 0) 373170530Ssam return cmp == len; 374138568Ssam } 375138568Ssam n--; 376138568Ssam (*cp)++; 377141658Ssam } 378141658Ssam 379148843Ssam return 0; 380138568Ssam} 381141658Ssam 382138568Ssamint 383138568Ssamhdlc_ReportStatus(struct cmdargs const *arg) 384170530Ssam{ 385170530Ssam struct hdlc *hdlc = &arg->cx->physical->hdlc; 386170530Ssam 387170530Ssam prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 388170530Ssam prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 389148432Ssam hdlc->stats.badfcs); 390170530Ssam prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 391170530Ssam HDLC_ADDR, hdlc->stats.badaddr); 392170530Ssam prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 393170530Ssam HDLC_UI, hdlc->stats.badcommand); 394170530Ssam prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 395170530Ssam hdlc->stats.unknownproto); 396170530Ssam return 0; 397170530Ssam} 398170530Ssam 399170530Ssamstatic void 400170530Ssamhdlc_ReportTime(void *v) 401127767Ssam{ 402170530Ssam /* Moan about HDLC errors */ 403127767Ssam struct hdlc *hdlc = (struct hdlc *)v; 404170530Ssam 405170530Ssam timer_Stop(&hdlc->ReportTimer); 406170530Ssam 407170530Ssam if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 408170530Ssam log_Printf(LogPHASE, 409170530Ssam "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 410170530Ssam hdlc->lqm.owner->fsm.link->name, 411170530Ssam hdlc->stats.badfcs - hdlc->laststats.badfcs, 412170530Ssam hdlc->stats.badaddr - hdlc->laststats.badaddr, 413170530Ssam hdlc->stats.badcommand - hdlc->laststats.badcommand, 414170530Ssam hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 415170530Ssam hdlc->laststats = hdlc->stats; 416170530Ssam } 417170530Ssam 418170530Ssam timer_Start(&hdlc->ReportTimer); 419170530Ssam} 420170530Ssam 421170530Ssamvoid 422170530Ssamhdlc_StartTimer(struct hdlc *hdlc) 423170530Ssam{ 424170530Ssam timer_Stop(&hdlc->ReportTimer); 425170530Ssam hdlc->ReportTimer.load = 60 * SECTICKS; 426170530Ssam hdlc->ReportTimer.arg = hdlc; 427170530Ssam hdlc->ReportTimer.func = hdlc_ReportTime; 428170530Ssam hdlc->ReportTimer.name = "hdlc"; 429170530Ssam timer_Start(&hdlc->ReportTimer); 430170530Ssam} 431170530Ssam 432170530Ssamvoid 433170530Ssamhdlc_StopTimer(struct hdlc *hdlc) 434170530Ssam{ 435170530Ssam timer_Stop(&hdlc->ReportTimer); 436170530Ssam} 437170530Ssam 438170530Ssamstruct layer hdlclayer = { LAYER_HDLC, "hdlc", hdlc_LayerPush, hdlc_LayerPull }; 439170530Ssam