hdlc.c revision 8857
1189251Ssam/* 2189251Ssam * PPP High Level Link Control (HDLC) Module 3252726Srpaulo * 4189251Ssam * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5252726Srpaulo * 6252726Srpaulo * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7189251Ssam * 8189251Ssam * Redistribution and use in source and binary forms are permitted 9189251Ssam * provided that the above copyright notice and this paragraph are 10189251Ssam * duplicated in all such forms and that any documentation, 11189251Ssam * advertising materials, and other materials related to such 12214734Srpaulo * distribution and use acknowledge that the software was developed 13214734Srpaulo * by the Internet Initiative Japan, Inc. The name of the 14252726Srpaulo * IIJ may not be used to endorse or promote products derived 15189251Ssam * from this software without specific prior written permission. 16189251Ssam * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17189251Ssam * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18189251Ssam * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19189251Ssam * 20189251Ssam * $Id: hdlc.c,v 1.2 1995/02/26 12:17:30 amurai Exp $ 21189251Ssam * 22189251Ssam * TODO: 23189251Ssam */ 24189251Ssam#include "fsm.h" 25189251Ssam#include "hdlc.h" 26189251Ssam#include "lcpproto.h" 27189251Ssam#include "lcp.h" 28189251Ssam#include "lqr.h" 29189251Ssam#include "vars.h" 30189251Ssam 31189251Ssamstruct hdlcstat { 32189251Ssam int badfcs; 33189251Ssam int badaddr; 34189251Ssam int badcommand; 35189251Ssam int unknownproto; 36189251Ssam} HdlcStat; 37189251Ssam 38189251Ssamstatic int ifOutPackets, ifOutOctets, ifOutLQRs; 39189251Ssamstatic int ifInPackets, ifInOctets; 40189251Ssam 41189251Ssamstruct protostat { 42189251Ssam u_short number; 43189251Ssam char *name; 44189251Ssam u_long in_count; 45189251Ssam u_long out_count; 46189251Ssam} ProtocolStat[] = { 47189251Ssam { PROTO_IP, "IP" }, 48189251Ssam { PROTO_VJUNCOMP, "VJ_UNCOMP" }, 49189251Ssam { PROTO_VJCOMP, "VJ_COMP" }, 50252726Srpaulo { PROTO_COMPD, "COMPD" }, 51252726Srpaulo { PROTO_LCP, "LCP" }, 52252726Srpaulo { PROTO_IPCP, "IPCP" }, 53189251Ssam { PROTO_CCP, "CCP" }, 54189251Ssam { PROTO_PAP, "PAP" }, 55189251Ssam { PROTO_LQR, "LQR" }, 56189251Ssam { PROTO_CHAP, "CHAP" }, 57189251Ssam { 0, "Others" }, 58189251Ssam}; 59189251Ssam 60189251Ssamstatic u_short fcstab[256] = { 61189251Ssam/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 62189251Ssam/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 63189251Ssam/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 64189251Ssam/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 65189251Ssam/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 66189251Ssam/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 67189251Ssam/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 68189251Ssam/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 69189251Ssam/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 70189251Ssam/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 71189251Ssam/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 72189251Ssam/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 73189251Ssam/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 74189251Ssam/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 75189251Ssam/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 76189251Ssam/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 77189251Ssam/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 78189251Ssam/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 79189251Ssam/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 80189251Ssam/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 81189251Ssam/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 82189251Ssam/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 83189251Ssam/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 84189251Ssam/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 85189251Ssam/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 86189251Ssam/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 87189251Ssam/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 88189251Ssam/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 89189251Ssam/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 90189251Ssam/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 91189251Ssam/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 92189251Ssam/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 93189251Ssam}; 94189251Ssam 95189251Ssamvoid 96189251SsamHdlcInit() 97189251Ssam{ 98189251Ssam ifInOctets = ifOutOctets = 0; 99189251Ssam ifInPackets = ifOutPackets = 0; 100189251Ssam ifOutLQRs = 0; 101189251Ssam} 102189251Ssam 103189251Ssam/* 104189251Ssam * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 105189251Ssam * 2.27 for further details. 106189251Ssam */ 107189251Ssamu_short 108189251SsamHdlcFcs(fcs, cp, len) 109189251Ssamu_short fcs; 110189251Ssamu_char *cp; 111189251Ssamint len; 112189251Ssam{ 113189251Ssam while (len--) 114189251Ssam fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 115189251Ssam return(fcs); 116189251Ssam} 117189251Ssam 118189251Ssamvoid 119189251SsamHdlcOutput(int pri, u_short proto, struct mbuf *bp) 120189251Ssam{ 121189251Ssam struct mbuf *mhp, *mfcs; 122189251Ssam struct protostat *statp; 123189251Ssam struct lqrdata *lqr; 124189251Ssam u_char *cp; 125189251Ssam u_short fcs; 126189251Ssam 127189251Ssam if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */ 128189251Ssam if (CcpFsm.state == ST_OPENED) { 129189251Ssam Pred1Output(pri, proto, bp); 130189251Ssam return; 131189251Ssam } 132189251Ssam } 133189251Ssam if (DEV_IS_SYNC) 134189251Ssam mfcs = NULLBUFF; 135189251Ssam else 136189251Ssam mfcs = mballoc(2, MB_HDLCOUT); 137189251Ssam mhp = mballoc(4, MB_HDLCOUT); 138189251Ssam mhp->cnt = 0; 139252726Srpaulo cp = MBUF_CTOP(mhp); 140252726Srpaulo if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) { 141189251Ssam *cp++ = HDLC_ADDR; 142252726Srpaulo *cp++ = HDLC_UI; 143189251Ssam mhp->cnt += 2; 144189251Ssam } 145189251Ssam /* 146189251Ssam * If possible, compress protocol field. 147189251Ssam */ 148189251Ssam if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) { 149189251Ssam *cp++ = proto; 150189251Ssam mhp->cnt++; 151252726Srpaulo } else { 152252726Srpaulo *cp++ = proto >> 8; 153189251Ssam *cp = proto & 0377; 154252726Srpaulo mhp->cnt += 2; 155189251Ssam } 156189251Ssam mhp->next = bp; 157252726Srpaulo bp->next = mfcs; 158189251Ssam 159189251Ssam lqr = &MyLqrData; 160252726Srpaulo lqr->PeerOutPackets = ifOutPackets++; 161252726Srpaulo ifOutOctets += plength(mhp) + 1; 162252726Srpaulo lqr->PeerOutOctets = ifOutOctets; 163189251Ssam 164189251Ssam if (proto == PROTO_LQR) { 165189251Ssam lqr->MagicNumber = LcpInfo.want_magic; 166189251Ssam lqr->LastOutLQRs = HisLqrData.PeerOutLQRs; 167252726Srpaulo lqr->LastOutPackets = HisLqrData.PeerOutPackets; 168189251Ssam lqr->LastOutOctets = HisLqrData.PeerOutOctets; 169189251Ssam lqr->PeerInLQRs = HisLqrSave.SaveInLQRs; 170189251Ssam lqr->PeerInPackets = HisLqrSave.SaveInPackets; 171189251Ssam lqr->PeerInDiscards = HisLqrSave.SaveInDiscards; 172189251Ssam lqr->PeerInErrors = HisLqrSave.SaveInErrors; 173189251Ssam lqr->PeerInOctets = HisLqrSave.SaveInOctets; 174252726Srpaulo lqr->PeerOutLQRs = ++ifOutLQRs; 175252726Srpaulo LqrDump("LqrOutput", lqr); 176252726Srpaulo LqrChangeOrder(lqr, (struct lqrdata *)(MBUF_CTOP(bp))); 177252726Srpaulo } 178252726Srpaulo 179252726Srpaulo if (!DEV_IS_SYNC) { 180252726Srpaulo fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt); 181252726Srpaulo fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt); 182252726Srpaulo fcs = ~fcs; 183252726Srpaulo cp = MBUF_CTOP(mfcs); 184252726Srpaulo *cp++ = fcs & 0377; /* Low byte first!! */ 185252726Srpaulo *cp++ = fcs >> 8; 186252726Srpaulo } 187252726Srpaulo 188252726Srpaulo LogDumpBp(LOG_HDLC, "HdlcOutput", mhp); 189252726Srpaulo for (statp = ProtocolStat; statp->number; statp++) 190252726Srpaulo if (statp->number == proto) 191252726Srpaulo break; 192252726Srpaulo statp->out_count++; 193252726Srpaulo if (DEV_IS_SYNC) 194252726Srpaulo ModemOutput(pri, mhp); 195252726Srpaulo else 196252726Srpaulo AsyncOutput(pri, mhp, proto); 197252726Srpaulo} 198252726Srpaulo 199189251SsamDecodePacket(proto, bp) 200189251Ssamu_short proto; 201189251Ssamstruct mbuf *bp; 202252726Srpaulo{ 203252726Srpaulo#ifdef DEBUG 204252726Srpaulo logprintf("proto = %04x\n", proto); 205252726Srpaulo#endif 206252726Srpaulo switch (proto) { 207189251Ssam case PROTO_LCP: 208189251Ssam LcpInput(bp); 209189251Ssam break; 210189251Ssam case PROTO_PAP: 211189251Ssam PapInput(bp); 212189251Ssam break; 213189251Ssam case PROTO_LQR: 214189251Ssam HisLqrSave.SaveInLQRs++; 215189251Ssam LqrInput(bp); 216252726Srpaulo break; 217252726Srpaulo case PROTO_CHAP: 218189251Ssam ChapInput(bp); 219189251Ssam break; 220189251Ssam case PROTO_VJUNCOMP: 221189251Ssam case PROTO_VJCOMP: 222189251Ssam bp = VjCompInput(bp, proto); 223189251Ssam if (bp == NULLBUFF) { 224189251Ssam break; 225189251Ssam } 226189251Ssam /* fall down */ 227189251Ssam case PROTO_IP: 228189251Ssam IpInput(bp); 229189251Ssam break; 230189251Ssam case PROTO_IPCP: 231189251Ssam IpcpInput(bp); 232189251Ssam break; 233189251Ssam case PROTO_CCP: 234189251Ssam CcpInput(bp); 235252726Srpaulo break; 236189251Ssam case PROTO_COMPD: 237189251Ssam Pred1Input(bp); 238189251Ssam break; 239189251Ssam default: 240189251Ssam logprintf("Unknown protocol 0x%04x\n", proto); 241189251Ssam /* 242189251Ssam * XXX: Should send protocol reject. 243189251Ssam */ 244189251Ssam HisLqrSave.SaveInDiscards++; 245189251Ssam HdlcStat.unknownproto++; 246189251Ssam pfree(bp); 247189251Ssam break; 248189251Ssam } 249252726Srpaulo} 250252726Srpaulo 251189251Ssamint 252189251SsamReportProtStatus() 253189251Ssam{ 254189251Ssam struct protostat *statp; 255189251Ssam int cnt; 256189251Ssam 257189251Ssam statp = ProtocolStat; 258189251Ssam statp--; 259189251Ssam cnt = 0; 260189251Ssam printf(" Protocol in out Protocol in out\n"); 261189251Ssam do { 262189251Ssam statp++; 263189251Ssam printf(" %-9s: %8u, %8u", 264189251Ssam statp->name, statp->in_count, statp->out_count); 265189251Ssam if (++cnt == 2) { 266189251Ssam printf("\n"); 267189251Ssam cnt = 0; 268189251Ssam } 269189251Ssam } while (statp->number); 270189251Ssam if (cnt) 271189251Ssam printf("\n"); 272252726Srpaulo return(1); 273252726Srpaulo} 274189251Ssam 275189251Ssamint 276189251SsamReportHdlcStatus() 277189251Ssam{ 278189251Ssam struct hdlcstat *hp = &HdlcStat; 279189251Ssam 280189251Ssam printf("HDLC level errors\n\n"); 281189251Ssam printf("FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n", 282189251Ssam hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto); 283189251Ssam return(1); 284189251Ssam} 285189251Ssam 286252726Srpaulostatic struct hdlcstat laststat; 287252726Srpaulo 288189251Ssamvoid 289189251SsamHdlcErrorCheck() 290252726Srpaulo{ 291252726Srpaulo struct hdlcstat *hp = &HdlcStat; 292189251Ssam struct hdlcstat *op = &laststat; 293252726Srpaulo 294252726Srpaulo if (bcmp(hp, op, sizeof(laststat))) { 295252726Srpaulo LogPrintf(LOG_PHASE, "HDLC errros -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n", 296189251Ssam hp->badfcs - op->badfcs, hp->badaddr - op->badaddr, 297189251Ssam hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto); 298252726Srpaulo } 299252726Srpaulo laststat = HdlcStat; 300189251Ssam} 301252726Srpaulo 302189251Ssamvoid 303252726SrpauloHdlcInput(struct mbuf *bp) 304252726Srpaulo{ 305252726Srpaulo u_short fcs, proto; 306252726Srpaulo u_char *cp, addr, ctrl; 307252726Srpaulo struct protostat *statp; 308252726Srpaulo 309189251Ssam LogDumpBp(LOG_HDLC, "HdlcInput:", bp); 310252726Srpaulo if (DEV_IS_SYNC) 311189251Ssam fcs = GOODFCS; 312189251Ssam else 313189251Ssam fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt); 314189251Ssam HisLqrSave.SaveInOctets += bp->cnt + 1; 315189251Ssam 316189251Ssam#ifdef DEBUG 317189251Ssam logprintf("fcs = %04x (%s)\n", fcs, (fcs == GOODFCS)? "good" : "bad"); 318189251Ssam#endif 319189251Ssam if (fcs != GOODFCS) { 320189251Ssam HisLqrSave.SaveInErrors++; 321189251Ssam#ifdef DEBUG 322189251Ssam logprintf("Bad FCS\n"); 323189251Ssam#endif 324189251Ssam HdlcStat.badfcs++; 325189251Ssam pfree(bp); 326189251Ssam return; 327189251Ssam } 328189251Ssam if (!DEV_IS_SYNC) 329189251Ssam bp->cnt -= 2; /* discard FCS part */ 330252726Srpaulo cp = MBUF_CTOP(bp); 331252726Srpaulo 332252726Srpaulo ifInPackets++; 333252726Srpaulo ifInOctets += bp->cnt; 334252726Srpaulo 335252726Srpaulo if (!LcpInfo.want_acfcomp) { 336252726Srpaulo /* 337252726Srpaulo * We expect that packet is not compressed. 338252726Srpaulo */ 339252726Srpaulo addr = *cp++; 340252726Srpaulo if (addr != HDLC_ADDR) { 341252726Srpaulo HisLqrSave.SaveInErrors++; 342252726Srpaulo HdlcStat.badaddr++; 343189251Ssam#ifdef DEBUG 344189251Ssam logprintf("addr %02x\n", *cp); 345189251Ssam#endif 346189251Ssam pfree(bp); 347189251Ssam return; 348189251Ssam } 349189251Ssam 350189251Ssam ctrl = *cp++; 351189251Ssam if (ctrl != HDLC_UI) { 352189251Ssam HisLqrSave.SaveInErrors++; 353189251Ssam HdlcStat.badcommand++; 354189251Ssam#ifdef DEBUG 355189251Ssam logprintf("command %02x\n", *cp); 356252726Srpaulo#endif 357252726Srpaulo pfree(bp); 358189251Ssam return; 359189251Ssam } 360189251Ssam bp->offset += 2; 361189251Ssam bp->cnt -= 2; 362252726Srpaulo } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 363252726Srpaulo /* 364252726Srpaulo * We can receive compressed packet, but peer still send 365252726Srpaulo * uncompressed packet to me. 366189251Ssam */ 367252726Srpaulo cp += 2; 368252726Srpaulo bp->offset += 2; 369252726Srpaulo bp->cnt -= 2; 370252726Srpaulo } 371252726Srpaulo 372252726Srpaulo if (LcpInfo.want_protocomp) { 373252726Srpaulo proto = 0; 374252726Srpaulo cp--; 375252726Srpaulo do { 376252726Srpaulo cp++; bp->offset++; bp->cnt--; 377252726Srpaulo proto = proto << 8; 378252726Srpaulo proto += *cp; 379252726Srpaulo } while (!(proto & 1)); 380252726Srpaulo } else { 381252726Srpaulo proto = *cp++ << 8; 382252726Srpaulo proto |= *cp++; 383252726Srpaulo bp->offset += 2; 384252726Srpaulo bp->cnt -= 2; 385252726Srpaulo } 386252726Srpaulo 387252726Srpaulo for (statp = ProtocolStat; statp->number; statp++) 388252726Srpaulo if (statp->number == proto) 389252726Srpaulo break; 390252726Srpaulo statp->in_count++; 391252726Srpaulo HisLqrSave.SaveInPackets++; 392252726Srpaulo 393189251Ssam DecodePacket(proto, bp); 394189251Ssam} 395252726Srpaulo