hdlc.c revision 46686
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: hdlc.c,v 1.41 1999/04/03 11:54:00 brian Exp $ 21 * 22 * TODO: 23 */ 24#include <sys/param.h> 25#include <netinet/in.h> 26#include <netinet/in_systm.h> 27#include <netinet/ip.h> 28#include <sys/un.h> 29 30#include <stdio.h> 31#include <string.h> 32#include <termios.h> 33 34#include "defs.h" 35#include "layer.h" 36#include "command.h" 37#include "mbuf.h" 38#include "log.h" 39#include "timer.h" 40#include "fsm.h" 41#include "lqr.h" 42#include "hdlc.h" 43#include "proto.h" 44#include "iplist.h" 45#include "throughput.h" 46#include "slcompress.h" 47#include "ipcp.h" 48#include "ip.h" 49#include "vjcomp.h" 50#include "auth.h" 51#include "pap.h" 52#include "lcp.h" 53#include "async.h" 54#include "ccp.h" 55#include "link.h" 56#include "descriptor.h" 57#include "chap.h" 58#include "physical.h" 59#include "prompt.h" 60#include "chat.h" 61#include "mp.h" 62#include "cbcp.h" 63#include "datalink.h" 64#include "filter.h" 65#ifndef NORADIUS 66#include "radius.h" 67#endif 68#include "bundle.h" 69 70static u_int16_t const fcstab[256] = { 71 /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 72 /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 73 /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 74 /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 75 /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 76 /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 77 /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 78 /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 79 /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 80 /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 81 /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 82 /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 83 /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 84 /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 85 /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 86 /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 87 /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 88 /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 89 /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 90 /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 91 /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 92 /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 93 /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 94 /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 95 /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 96 /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 97 /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 98 /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 99 /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 100 /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 101 /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 102 /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 103}; 104 105void 106hdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 107{ 108 memset(hdlc, '\0', sizeof(struct hdlc)); 109 hdlc->lqm.owner = lcp; 110} 111 112/* 113 * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 114 * 2.27 for further details. 115 */ 116u_short 117hdlc_Fcs(u_char *cp, size_t len) 118{ 119 u_short fcs = INITFCS; 120 121 while (len--) 122 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 123 124 return fcs; 125} 126 127static inline u_short 128HdlcFcsBuf(u_short fcs, struct mbuf *m) 129{ 130 int len; 131 u_char *pos, *end; 132 133 len = mbuf_Length(m); 134 pos = MBUF_CTOP(m); 135 end = pos + m->cnt; 136 while (len--) { 137 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 138 if (pos == end && len) { 139 m = m->next; 140 pos = MBUF_CTOP(m); 141 end = pos + m->cnt; 142 } 143 } 144 return (fcs); 145} 146 147int 148hdlc_WrapperOctets(struct lcp *lcp, u_short proto) 149{ 150 return 2; 151} 152 153static struct mbuf * 154hdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 155 int pri, u_short *proto) 156{ 157 struct mbuf *last; 158 u_char *cp; 159 u_short fcs; 160 161 fcs = HdlcFcsBuf(INITFCS, bp); 162 fcs = ~fcs; 163 164 for (last = bp; last->next; last = last->next) 165 ; 166 167 if (last->size - last->offset - last->cnt >= 2) { 168 cp = MBUF_CTOP(last) + last->cnt; 169 last->cnt += 2; 170 } else { 171 struct mbuf *tail = mbuf_Alloc(2, MB_HDLCOUT); 172 last->next = tail; 173 cp = MBUF_CTOP(tail); 174 } 175 176 *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 177 *cp++ = fcs >> 8; 178 179 log_DumpBp(LogHDLC, "hdlc_Output", bp); 180 181 return bp; 182} 183 184/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 185static struct { 186 u_short from; 187 u_short to; 188 const char *name; 189} protocols[] = { 190 { 0x0001, 0x0001, "Padding Protocol" }, 191 { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 192 { 0x0021, 0x0021, "Internet Protocol" }, 193 { 0x0023, 0x0023, "OSI Network Layer" }, 194 { 0x0025, 0x0025, "Xerox NS IDP" }, 195 { 0x0027, 0x0027, "DECnet Phase IV" }, 196 { 0x0029, 0x0029, "Appletalk" }, 197 { 0x002b, 0x002b, "Novell IPX" }, 198 { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 199 { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 200 { 0x0031, 0x0031, "Bridging PDU" }, 201 { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 202 { 0x0035, 0x0035, "Banyan Vines" }, 203 { 0x0037, 0x0037, "reserved (until 1993)" }, 204 { 0x0039, 0x0039, "AppleTalk EDDP" }, 205 { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 206 { 0x003d, 0x003d, "Multi-Link" }, 207 { 0x003f, 0x003f, "NETBIOS Framing" }, 208 { 0x0041, 0x0041, "Cisco Systems" }, 209 { 0x0043, 0x0043, "Ascom Timeplex" }, 210 { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 211 { 0x0047, 0x0047, "DCA Remote Lan" }, 212 { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 213 { 0x004b, 0x004b, "SNA over 802.2" }, 214 { 0x004d, 0x004d, "SNA" }, 215 { 0x004f, 0x004f, "IP6 Header Compression" }, 216 { 0x0051, 0x0051, "KNX Bridging Data" }, 217 { 0x0053, 0x0053, "Encryption" }, 218 { 0x0055, 0x0055, "Individual Link Encryption" }, 219 { 0x006f, 0x006f, "Stampede Bridging" }, 220 { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 221 { 0x0073, 0x0073, "MP+ Protocol" }, 222 { 0x007d, 0x007d, "reserved (Control Escape)" }, 223 { 0x007f, 0x007f, "reserved (compression inefficient)" }, 224 { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 225 { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 226 { 0x00fd, 0x00fd, "1st choice compression" }, 227 { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 228 { 0x0200, 0x02ff, "(compression inefficient)" }, 229 { 0x0201, 0x0201, "802.1d Hello Packets" }, 230 { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 231 { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 232 { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 233 { 0x0209, 0x0209, "Netcs Twin Routing" }, 234 { 0x0231, 0x0231, "Luxcom" }, 235 { 0x0233, 0x0233, "Sigma Network Systems" }, 236 { 0x0235, 0x0235, "Apple Client Server Protocol" }, 237 { 0x1e00, 0x1eff, "(compression inefficient)" }, 238 { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 239 { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 240 { 0x4021, 0x4021, "Stacker LZS" }, 241 { 0x8001, 0x801f, "Not Used - reserved" }, 242 { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 243 { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 244 { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 245 { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 246 { 0x8029, 0x8029, "Appletalk Control Protocol" }, 247 { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 248 { 0x802d, 0x802d, "reserved" }, 249 { 0x802f, 0x802f, "reserved" }, 250 { 0x8031, 0x8031, "Bridging NCP" }, 251 { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 252 { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 253 { 0x8037, 0x8037, "reserved till 1993" }, 254 { 0x8039, 0x8039, "reserved" }, 255 { 0x803b, 0x803b, "reserved" }, 256 { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 257 { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 258 { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 259 { 0x8043, 0x8043, "Ascom Timeplex" }, 260 { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 261 { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 262 { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 263 { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 264 { 0x804d, 0x804d, "SNA Control Protocol" }, 265 { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 266 { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 267 { 0x8053, 0x8053, "Encryption Control Protocol" }, 268 { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 269 { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 270 { 0x8073, 0x8073, "MP+ Control Protocol" }, 271 { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 272 { 0x807d, 0x807d, "Not Used - reserved" }, 273 { 0x80cf, 0x80cf, "Not Used - reserved" }, 274 { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 275 { 0x80fd, 0x80fd, "Compression Control Protocol" }, 276 { 0x80ff, 0x80ff, "Not Used - reserved" }, 277 { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 278 { 0x8209, 0x8209, "Netcs Twin Routing" }, 279 { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 280 { 0xc021, 0xc021, "Link Control Protocol" }, 281 { 0xc023, 0xc023, "Password Authentication Protocol" }, 282 { 0xc025, 0xc025, "Link Quality Report" }, 283 { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 284 { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 285 { 0xc081, 0xc081, "Container Control Protocol" }, 286 { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 287 { 0xc225, 0xc225, "RSA Authentication Protocol" }, 288 { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 289 { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 290 { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 291 { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 292 { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 293}; 294 295#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 296 297const char * 298hdlc_Protocol2Nam(u_short proto) 299{ 300 int f; 301 302 for (f = 0; f < NPROTOCOLS; f++) 303 if (proto >= protocols[f].from && proto <= protocols[f].to) 304 return protocols[f].name; 305 else if (proto < protocols[f].from) 306 break; 307 return "unrecognised protocol"; 308} 309 310static struct mbuf * 311hdlc_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, 312 u_short *proto) 313{ 314 struct physical *p = link2physical(l); 315 u_short fcs; 316 int len; 317 318 if (!p) { 319 log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 320 return bp; 321 } 322 323 log_DumpBp(LogHDLC, "hdlc_Input:", bp); 324 325 fcs = hdlc_Fcs(MBUF_CTOP(bp), bp->cnt); 326 327 log_Printf(LogDEBUG, "%s: hdlc_Input: fcs = %04x (%s)\n", 328 p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 329 330 if (fcs != GOODFCS) { 331 p->hdlc.lqm.SaveInErrors++; 332 p->hdlc.stats.badfcs++; 333 mbuf_Free(bp); 334 return NULL; 335 } 336 337 p->hdlc.lqm.SaveInOctets += bp->cnt + 1; 338 p->hdlc.lqm.SaveInPackets++; 339 340 len = mbuf_Length(bp); 341 if (len < 4) { /* rfc1662 section 4.3 */ 342 mbuf_Free(bp); 343 bp = NULL; 344 } 345 346 bp = mbuf_Truncate(bp, len - 2); /* discard the FCS */ 347 348 return bp; 349} 350 351/* 352 * Detect a HDLC frame 353 */ 354 355static const struct frameheader { 356 const u_char *data; 357 int len; 358} FrameHeaders[] = { 359 { "\176\377\003\300\041", 5 }, 360 { "\176\377\175\043\300\041", 6 }, 361 { "\176\177\175\043\100\041", 6 }, 362 { "\176\175\337\175\043\300\041", 7 }, 363 { "\176\175\137\175\043\100\041", 7 }, 364 { NULL, 0 } 365}; 366 367int 368hdlc_Detect(u_char const **cp, int n, int issync) 369{ 370 const struct frameheader *fh; 371 const u_char *h; 372 size_t len, cmp; 373 374 while (n) { 375 for (fh = FrameHeaders; fh->len; fh++) { 376 h = issync ? fh->data + 1 : fh->data; 377 len = issync ? fh->len - 1 : fh->len; 378 cmp = n >= len ? len : n; 379 if (memcmp(*cp, h, cmp) == 0) 380 return cmp == len; 381 } 382 n--; 383 (*cp)++; 384 } 385 386 return 0; 387} 388 389int 390hdlc_ReportStatus(struct cmdargs const *arg) 391{ 392 struct hdlc *hdlc = &arg->cx->physical->hdlc; 393 394 prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 395 prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 396 hdlc->stats.badfcs); 397 prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 398 HDLC_ADDR, hdlc->stats.badaddr); 399 prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 400 HDLC_UI, hdlc->stats.badcommand); 401 prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 402 hdlc->stats.unknownproto); 403 return 0; 404} 405 406static void 407hdlc_ReportTime(void *v) 408{ 409 /* Moan about HDLC errors */ 410 struct hdlc *hdlc = (struct hdlc *)v; 411 412 timer_Stop(&hdlc->ReportTimer); 413 414 if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 415 log_Printf(LogPHASE, 416 "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 417 hdlc->lqm.owner->fsm.link->name, 418 hdlc->stats.badfcs - hdlc->laststats.badfcs, 419 hdlc->stats.badaddr - hdlc->laststats.badaddr, 420 hdlc->stats.badcommand - hdlc->laststats.badcommand, 421 hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 422 hdlc->laststats = hdlc->stats; 423 } 424 425 timer_Start(&hdlc->ReportTimer); 426} 427 428void 429hdlc_StartTimer(struct hdlc *hdlc) 430{ 431 timer_Stop(&hdlc->ReportTimer); 432 hdlc->ReportTimer.load = 60 * SECTICKS; 433 hdlc->ReportTimer.arg = hdlc; 434 hdlc->ReportTimer.func = hdlc_ReportTime; 435 hdlc->ReportTimer.name = "hdlc"; 436 timer_Start(&hdlc->ReportTimer); 437} 438 439void 440hdlc_StopTimer(struct hdlc *hdlc) 441{ 442 timer_Stop(&hdlc->ReportTimer); 443} 444 445struct layer hdlclayer = { LAYER_HDLC, "hdlc", hdlc_LayerPush, hdlc_LayerPull }; 446