hdlc.c revision 6059
1/* 2 * PPP High Level Link Control (HDLC) Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * $Id:$ 21 * 22 * TODO: 23 */ 24#include "fsm.h" 25#include "hdlc.h" 26#include "lcpproto.h" 27#include "lcp.h" 28#include "lqr.h" 29 30struct hdlcstat { 31 int badfcs; 32 int badaddr; 33 int badcommand; 34 int unknownproto; 35} HdlcStat; 36 37static int ifOutPackets, ifOutOctets, ifOutLQRs; 38static int ifInPackets, ifInOctets; 39 40struct protostat { 41 u_short number; 42 char *name; 43 u_long in_count; 44 u_long out_count; 45} ProtocolStat[] = { 46 { PROTO_IP, "IP" }, 47 { PROTO_VJUNCOMP, "VJ_UNCOMP" }, 48 { PROTO_VJCOMP, "VJ_COMP" }, 49 { PROTO_COMPD, "COMPD" }, 50 { PROTO_LCP, "LCP" }, 51 { PROTO_IPCP, "IPCP" }, 52 { PROTO_CCP, "CCP" }, 53 { PROTO_PAP, "PAP" }, 54 { PROTO_LQR, "LQR" }, 55 { PROTO_CHAP, "CHAP" }, 56 { 0, "Others" }, 57}; 58 59static u_short fcstab[256] = { 60/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 61/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 62/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 63/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 64/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 65/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 66/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 67/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 68/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 69/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 70/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 71/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 72/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 73/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 74/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 75/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 76/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 77/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 78/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 79/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 80/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 81/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 82/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 83/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 84/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 85/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 86/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 87/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 88/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 89/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 90/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 91/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 92}; 93 94void 95HdlcInit() 96{ 97 ifInOctets = ifOutOctets = 0; 98 ifInPackets = ifOutPackets = 0; 99 ifOutLQRs = 0; 100} 101 102/* 103 * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 104 * 2.27 for further details. 105 */ 106u_short 107HdlcFcs(fcs, cp, len) 108u_short fcs; 109u_char *cp; 110int len; 111{ 112 while (len--) 113 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 114 return(fcs); 115} 116 117void 118HdlcOutput(int pri, u_short proto, struct mbuf *bp) 119{ 120 struct mbuf *mhp, *mfcs; 121 struct protostat *statp; 122 struct lqrdata *lqr; 123 u_char *cp; 124 u_short fcs; 125 126 if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */ 127 if (CcpFsm.state == ST_OPENED) { 128 Pred1Output(pri, proto, bp); 129 return; 130 } 131 } 132 mfcs = mballoc(2, MB_HDLCOUT); 133 mhp = mballoc(4, MB_HDLCOUT); 134 mhp->cnt = 0; 135 cp = MBUF_CTOP(mhp); 136 if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) { 137 *cp++ = HDLC_ADDR; 138 *cp++ = HDLC_UI; 139 mhp->cnt += 2; 140 } 141 /* 142 * If possible, compress protocol field. 143 */ 144 if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) { 145 *cp++ = proto; 146 mhp->cnt++; 147 } else { 148 *cp++ = proto >> 8; 149 *cp = proto & 0377; 150 mhp->cnt += 2; 151 } 152 mhp->next = bp; 153 bp->next = mfcs; 154 155 lqr = &MyLqrData; 156 lqr->PeerOutPackets = ifOutPackets++; 157 ifOutOctets += plength(mhp) + 1; 158 lqr->PeerOutOctets = ifOutOctets; 159 160 if (proto == PROTO_LQR) { 161 lqr->MagicNumber = LcpInfo.want_magic; 162 lqr->LastOutLQRs = HisLqrData.PeerOutLQRs; 163 lqr->LastOutPackets = HisLqrData.PeerOutPackets; 164 lqr->LastOutOctets = HisLqrData.PeerOutOctets; 165 lqr->PeerInLQRs = HisLqrSave.SaveInLQRs; 166 lqr->PeerInPackets = HisLqrSave.SaveInPackets; 167 lqr->PeerInDiscards = HisLqrSave.SaveInDiscards; 168 lqr->PeerInErrors = HisLqrSave.SaveInErrors; 169 lqr->PeerInOctets = HisLqrSave.SaveInOctets; 170 lqr->PeerOutLQRs = ++ifOutLQRs; 171 LqrDump("LqrOutput", lqr); 172 LqrChangeOrder(lqr, (struct lqrdata *)(MBUF_CTOP(bp))); 173 } 174 175 fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt); 176 fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt); 177 fcs = ~fcs; 178 cp = MBUF_CTOP(mfcs); 179 *cp++ = fcs & 0377; /* Low byte first!! */ 180 *cp++ = fcs >> 8; 181 182 LogDumpBp(LOG_HDLC, "HdlcOutput", mhp); 183 for (statp = ProtocolStat; statp->number; statp++) 184 if (statp->number == proto) 185 break; 186 statp->out_count++; 187 AsyncOutput(pri, mhp, proto); 188} 189 190DecodePacket(proto, bp) 191u_short proto; 192struct mbuf *bp; 193{ 194#ifdef DEBUG 195 logprintf("proto = %04x\n", proto); 196#endif 197 switch (proto) { 198 case PROTO_LCP: 199 LcpInput(bp); 200 break; 201 case PROTO_PAP: 202 PapInput(bp); 203 break; 204 case PROTO_LQR: 205 HisLqrSave.SaveInLQRs++; 206 LqrInput(bp); 207 break; 208 case PROTO_CHAP: 209 ChapInput(bp); 210 break; 211 case PROTO_VJUNCOMP: 212 case PROTO_VJCOMP: 213 bp = VjCompInput(bp, proto); 214 /* fall down */ 215 case PROTO_IP: 216 IpInput(bp); 217 break; 218 case PROTO_IPCP: 219 IpcpInput(bp); 220 break; 221 case PROTO_CCP: 222 CcpInput(bp); 223 break; 224 case PROTO_COMPD: 225 Pred1Input(bp); 226 break; 227 default: 228 logprintf("Unknown protocol 0x%04x\n", proto); 229 /* 230 * XXX: Should send protocol reject. 231 */ 232 HisLqrSave.SaveInDiscards++; 233 HdlcStat.unknownproto++; 234 pfree(bp); 235 break; 236 } 237} 238 239int 240ReportProtStatus() 241{ 242 struct protostat *statp; 243 int cnt; 244 245 statp = ProtocolStat; 246 statp--; 247 cnt = 0; 248 printf(" Protocol in out Protocol in out\n"); 249 do { 250 statp++; 251 printf(" %-9s: %8u, %8u", 252 statp->name, statp->in_count, statp->out_count); 253 if (++cnt == 2) { 254 printf("\n"); 255 cnt = 0; 256 } 257 } while (statp->number); 258 if (cnt) 259 printf("\n"); 260 return(1); 261} 262 263int 264ReportHdlcStatus() 265{ 266 struct hdlcstat *hp = &HdlcStat; 267 268 printf("HDLC level errors\n\n"); 269 printf("FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n", 270 hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto); 271 return(1); 272} 273 274static struct hdlcstat laststat; 275 276void 277HdlcErrorCheck() 278{ 279 struct hdlcstat *hp = &HdlcStat; 280 struct hdlcstat *op = &laststat; 281 282 if (bcmp(hp, op, sizeof(laststat))) { 283 LogPrintf(LOG_PHASE, "HDLC errros -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n", 284 hp->badfcs - op->badfcs, hp->badaddr - op->badaddr, 285 hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto); 286 } 287 laststat = HdlcStat; 288} 289 290void 291HdlcInput(struct mbuf *bp) 292{ 293 u_short fcs, proto; 294 u_char *cp, addr, ctrl; 295 struct protostat *statp; 296 297 LogDumpBp(LOG_HDLC, "HdlcInput:", bp); 298 fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt); 299 HisLqrSave.SaveInOctets += bp->cnt + 1; 300 301#ifdef DEBUG 302 logprintf("fcs = %04x (%s)\n", fcs, (fcs == GOODFCS)? "good" : "bad"); 303#endif 304 if (fcs != GOODFCS) { 305 HisLqrSave.SaveInErrors++; 306#ifdef DEBUG 307 logprintf("Bad FCS\n"); 308#endif 309 HdlcStat.badfcs++; 310 pfree(bp); 311 return; 312 } 313 bp->cnt -= 2; /* discard FCS part */ 314 cp = MBUF_CTOP(bp); 315 316 ifInPackets++; 317 ifInOctets += bp->cnt; 318 319 if (!LcpInfo.want_acfcomp) { 320 /* 321 * We expect that packet is not compressed. 322 */ 323 addr = *cp++; 324 if (addr != HDLC_ADDR) { 325 HisLqrSave.SaveInErrors++; 326 HdlcStat.badaddr++; 327#ifdef DEBUG 328 logprintf("addr %02x\n", *cp); 329#endif 330 pfree(bp); 331 return; 332 } 333 334 ctrl = *cp++; 335 if (ctrl != HDLC_UI) { 336 HisLqrSave.SaveInErrors++; 337 HdlcStat.badcommand++; 338#ifdef DEBUG 339 logprintf("command %02x\n", *cp); 340#endif 341 pfree(bp); 342 return; 343 } 344 bp->offset += 2; 345 bp->cnt -= 2; 346 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 347 /* 348 * We can receive compressed packet, but peer still send 349 * uncompressed packet to me. 350 */ 351 cp += 2; 352 bp->offset += 2; 353 bp->cnt -= 2; 354 } 355 356 if (LcpInfo.want_protocomp) { 357 proto = 0; 358 cp--; 359 do { 360 cp++; bp->offset++; bp->cnt--; 361 proto = proto << 8; 362 proto += *cp; 363 } while (!(proto & 1)); 364 } else { 365 proto = *cp++ << 8; 366 proto |= *cp++; 367 bp->offset += 2; 368 bp->cnt -= 2; 369 } 370 371 for (statp = ProtocolStat; statp->number; statp++) 372 if (statp->number == proto) 373 break; 374 statp->in_count++; 375 HisLqrSave.SaveInPackets++; 376 377 DecodePacket(proto, bp); 378} 379