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 1.35 1998/08/01 01:02:12 brian Exp $ 21 * 22 * TODO: 23 */ 24 #include <sys/types.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 "command.h" 36 #include "mbuf.h" 37 #include "log.h" 38 #include "timer.h" 39 #include "fsm.h" 40 #include "lqr.h" 41 #include "hdlc.h" 42 #include "lcpproto.h" 43 #include "iplist.h" 44 #include "throughput.h" 45 #include "slcompress.h" 46 #include "ipcp.h" 47 #include "ip.h" 48 #include "vjcomp.h" 49 #include "auth.h" 50 #include "pap.h" 51 #include "chap.h" 52 #include "lcp.h" 53 #include "async.h" 54 #include "ccp.h" 55 #include "link.h" 56 #include "descriptor.h" 57 #include "physical.h" 58 #include "prompt.h" 59 #include "chat.h" 60 #include "mp.h" 61 #include "cbcp.h" 62 #include "datalink.h" 63 #include "filter.h" 64 #include "bundle.h" 65 66 static u_int16_t const fcstab[256] = { 67 /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 68 /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 69 /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 70 /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 71 /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 72 /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 73 /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 74 /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 75 /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 76 /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 77 /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 78 /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 79 /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 80 /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 81 /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 82 /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 83 /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 84 /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 85 /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 86 /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 87 /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 88 /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 89 /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 90 /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 91 /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 92 /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 93 /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 94 /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 95 /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 96 /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 97 /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 98 /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 99 }; 100 101 void 102 hdlc_Init(struct hdlc *hdlc, struct lcp *lcp) 103 { 104 memset(hdlc, '\0', sizeof(struct hdlc)); 105 hdlc->lqm.owner = lcp; 106 } 107 108 /* 109 * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 110 * 2.27 for further details. 111 */ 112 inline u_short 113 hdlc_Fcs(u_short fcs, u_char * cp, int len) 114 { 115 while (len--) 116 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 117 return (fcs); 118 } 119 120 static inline u_short 121 HdlcFcsBuf(u_short fcs, struct mbuf *m) 122 { 123 int len; 124 u_char *pos, *end; 125 126 len = mbuf_Length(m); 127 pos = MBUF_CTOP(m); 128 end = pos + m->cnt; 129 while (len--) { 130 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 131 if (pos == end && len) { 132 m = m->next; 133 pos = MBUF_CTOP(m); 134 end = pos + m->cnt; 135 } 136 } 137 return (fcs); 138 } 139 140 void 141 hdlc_Output(struct link *l, int pri, u_short proto, struct mbuf *bp) 142 { 143 struct physical *p = link2physical(l); 144 struct mbuf *mhp, *mfcs; 145 u_char *cp; 146 u_short fcs; 147 148 if (!p || physical_IsSync(p)) 149 mfcs = NULL; 150 else 151 mfcs = mbuf_Alloc(2, MB_HDLCOUT); 152 153 mhp = mbuf_Alloc(4, MB_HDLCOUT); 154 mhp->cnt = 0; 155 cp = MBUF_CTOP(mhp); 156 if (p && (proto == PROTO_LCP || l->lcp.his_acfcomp == 0)) { 157 *cp++ = HDLC_ADDR; 158 *cp++ = HDLC_UI; 159 mhp->cnt += 2; 160 } 161 162 /* 163 * If possible, compress protocol field. 164 */ 165 if (l->lcp.his_protocomp && (proto & 0xff00) == 0) { 166 *cp++ = proto; 167 mhp->cnt++; 168 } else { 169 *cp++ = proto >> 8; 170 *cp = proto & 0377; 171 mhp->cnt += 2; 172 } 173 174 mhp->next = bp; 175 176 if (!p) { 177 /* 178 * This is where we multiplex the data over our available physical 179 * links. We don't frame our logical link data. Instead we wait 180 * for the logical link implementation to chop our data up and pile 181 * it into the physical links by re-calling this function with the 182 * encapsulated fragments. 183 */ 184 link_Output(l, pri, mhp); 185 return; 186 } 187 188 /* Tack mfcs onto the end, then set bp back to the start of the data */ 189 while (bp->next != NULL) 190 bp = bp->next; 191 bp->next = mfcs; 192 bp = mhp->next; 193 194 p->hdlc.lqm.OutOctets += mbuf_Length(mhp) + 1; 195 p->hdlc.lqm.OutPackets++; 196 197 if (proto == PROTO_LQR) { 198 /* Overwrite the entire packet */ 199 struct lqrdata lqr; 200 201 lqr.MagicNumber = p->link.lcp.want_magic; 202 lqr.LastOutLQRs = p->hdlc.lqm.lqr.peer.PeerOutLQRs; 203 lqr.LastOutPackets = p->hdlc.lqm.lqr.peer.PeerOutPackets; 204 lqr.LastOutOctets = p->hdlc.lqm.lqr.peer.PeerOutOctets; 205 lqr.PeerInLQRs = p->hdlc.lqm.lqr.SaveInLQRs; 206 lqr.PeerInPackets = p->hdlc.lqm.SaveInPackets; 207 lqr.PeerInDiscards = p->hdlc.lqm.SaveInDiscards; 208 lqr.PeerInErrors = p->hdlc.lqm.SaveInErrors; 209 lqr.PeerInOctets = p->hdlc.lqm.SaveInOctets; 210 lqr.PeerOutPackets = p->hdlc.lqm.OutPackets; 211 lqr.PeerOutOctets = p->hdlc.lqm.OutOctets; 212 if (p->hdlc.lqm.lqr.peer.LastOutLQRs == p->hdlc.lqm.lqr.OutLQRs) { 213 /* 214 * only increment if it's the first time or we've got a reply 215 * from the last one 216 */ 217 lqr.PeerOutLQRs = ++p->hdlc.lqm.lqr.OutLQRs; 218 lqr_Dump(l->name, "Output", &lqr); 219 } else { 220 lqr.PeerOutLQRs = p->hdlc.lqm.lqr.OutLQRs; 221 lqr_Dump(l->name, "Output (again)", &lqr); 222 } 223 lqr_ChangeOrder(&lqr, (struct lqrdata *)MBUF_CTOP(bp)); 224 } 225 226 if (mfcs) { 227 mfcs->cnt = 0; 228 fcs = HdlcFcsBuf(INITFCS, mhp); 229 fcs = ~fcs; 230 cp = MBUF_CTOP(mfcs); 231 *cp++ = fcs & 0377; /* Low byte first!! */ 232 *cp++ = fcs >> 8; 233 mfcs->cnt = 2; 234 } 235 236 log_DumpBp(LogHDLC, "hdlc_Output", mhp); 237 238 link_ProtocolRecord(l, proto, PROTO_OUT); 239 log_Printf(LogDEBUG, "hdlc_Output: proto = 0x%04x\n", proto); 240 241 if (physical_IsSync(p)) 242 link_Output(l, pri, mhp); /* Send it raw */ 243 else 244 async_Output(pri, mhp, proto, p); 245 } 246 247 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 248 static struct { 249 u_short from; 250 u_short to; 251 const char *name; 252 } protocols[] = { 253 { 0x0001, 0x0001, "Padding Protocol" }, 254 { 0x0003, 0x001f, "reserved (transparency inefficient)" }, 255 { 0x0021, 0x0021, "Internet Protocol" }, 256 { 0x0023, 0x0023, "OSI Network Layer" }, 257 { 0x0025, 0x0025, "Xerox NS IDP" }, 258 { 0x0027, 0x0027, "DECnet Phase IV" }, 259 { 0x0029, 0x0029, "Appletalk" }, 260 { 0x002b, 0x002b, "Novell IPX" }, 261 { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, 262 { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, 263 { 0x0031, 0x0031, "Bridging PDU" }, 264 { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, 265 { 0x0035, 0x0035, "Banyan Vines" }, 266 { 0x0037, 0x0037, "reserved (until 1993)" }, 267 { 0x0039, 0x0039, "AppleTalk EDDP" }, 268 { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, 269 { 0x003d, 0x003d, "Multi-Link" }, 270 { 0x003f, 0x003f, "NETBIOS Framing" }, 271 { 0x0041, 0x0041, "Cisco Systems" }, 272 { 0x0043, 0x0043, "Ascom Timeplex" }, 273 { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 274 { 0x0047, 0x0047, "DCA Remote Lan" }, 275 { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, 276 { 0x004b, 0x004b, "SNA over 802.2" }, 277 { 0x004d, 0x004d, "SNA" }, 278 { 0x004f, 0x004f, "IP6 Header Compression" }, 279 { 0x0051, 0x0051, "KNX Bridging Data" }, 280 { 0x0053, 0x0053, "Encryption" }, 281 { 0x0055, 0x0055, "Individual Link Encryption" }, 282 { 0x006f, 0x006f, "Stampede Bridging" }, 283 { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, 284 { 0x0073, 0x0073, "MP+ Protocol" }, 285 { 0x007d, 0x007d, "reserved (Control Escape)" }, 286 { 0x007f, 0x007f, "reserved (compression inefficient)" }, 287 { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, 288 { 0x00fb, 0x00fb, "compression on single link in multilink group" }, 289 { 0x00fd, 0x00fd, "1st choice compression" }, 290 { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, 291 { 0x0200, 0x02ff, "(compression inefficient)" }, 292 { 0x0201, 0x0201, "802.1d Hello Packets" }, 293 { 0x0203, 0x0203, "IBM Source Routing BPDU" }, 294 { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, 295 { 0x0207, 0x0207, "Cisco Discovery Protocol" }, 296 { 0x0209, 0x0209, "Netcs Twin Routing" }, 297 { 0x0231, 0x0231, "Luxcom" }, 298 { 0x0233, 0x0233, "Sigma Network Systems" }, 299 { 0x0235, 0x0235, "Apple Client Server Protocol" }, 300 { 0x1e00, 0x1eff, "(compression inefficient)" }, 301 { 0x4001, 0x4001, "Cray Communications Control Protocol" }, 302 { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, 303 { 0x4021, 0x4021, "Stacker LZS" }, 304 { 0x8001, 0x801f, "Not Used - reserved" }, 305 { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, 306 { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, 307 { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, 308 { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, 309 { 0x8029, 0x8029, "Appletalk Control Protocol" }, 310 { 0x802b, 0x802b, "Novell IPX Control Protocol" }, 311 { 0x802d, 0x802d, "reserved" }, 312 { 0x802f, 0x802f, "reserved" }, 313 { 0x8031, 0x8031, "Bridging NCP" }, 314 { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, 315 { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, 316 { 0x8037, 0x8037, "reserved till 1993" }, 317 { 0x8039, 0x8039, "reserved" }, 318 { 0x803b, 0x803b, "reserved" }, 319 { 0x803d, 0x803d, "Multi-Link Control Protocol" }, 320 { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, 321 { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, 322 { 0x8043, 0x8043, "Ascom Timeplex" }, 323 { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, 324 { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 325 { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 326 { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, 327 { 0x804d, 0x804d, "SNA Control Protocol" }, 328 { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, 329 { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, 330 { 0x8053, 0x8053, "Encryption Control Protocol" }, 331 { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, 332 { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, 333 { 0x8073, 0x8073, "MP+ Control Protocol" }, 334 { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, 335 { 0x807d, 0x807d, "Not Used - reserved" }, 336 { 0x80cf, 0x80cf, "Not Used - reserved" }, 337 { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, 338 { 0x80fd, 0x80fd, "Compression Control Protocol" }, 339 { 0x80ff, 0x80ff, "Not Used - reserved" }, 340 { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, 341 { 0x8209, 0x8209, "Netcs Twin Routing" }, 342 { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, 343 { 0xc021, 0xc021, "Link Control Protocol" }, 344 { 0xc023, 0xc023, "Password Authentication Protocol" }, 345 { 0xc025, 0xc025, "Link Quality Report" }, 346 { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, 347 { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, 348 { 0xc081, 0xc081, "Container Control Protocol" }, 349 { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, 350 { 0xc225, 0xc225, "RSA Authentication Protocol" }, 351 { 0xc227, 0xc227, "Extensible Authentication Protocol" }, 352 { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, 353 { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, 354 { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, 355 { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } 356 }; 357 358 #define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) 359 360 const char * 361 hdlc_Protocol2Nam(u_short proto) 362 { 363 int f; 364 365 for (f = 0; f < NPROTOCOLS; f++) 366 if (proto >= protocols[f].from && proto <= protocols[f].to) 367 return protocols[f].name; 368 else if (proto < protocols[f].from) 369 break; 370 return "unrecognised protocol"; 371 } 372 373 void 374 hdlc_DecodePacket(struct bundle *bundle, u_short proto, struct mbuf * bp, 375 struct link *l) 376 { 377 struct physical *p = link2physical(l); 378 u_char *cp; 379 const char *type; 380 381 log_Printf(LogDEBUG, "DecodePacket: proto = 0x%04x\n", proto); 382 383 /* decompress everything. CCP needs uncompressed data too */ 384 if ((bp = ccp_Decompress(&l->ccp, &proto, bp)) == NULL) 385 return; 386 387 switch (proto) { 388 case PROTO_LCP: 389 lcp_Input(&l->lcp, bp); 390 break; 391 case PROTO_PAP: 392 if (p) 393 pap_Input(bundle, bp, p); 394 else { 395 log_Printf(LogERROR, "DecodePacket: PAP: Not a physical link !\n"); 396 mbuf_Free(bp); 397 } 398 break; 399 case PROTO_CBCP: 400 if (p) 401 cbcp_Input(p, bp); 402 else { 403 log_Printf(LogERROR, "DecodePacket: CBCP: Not a physical link !\n"); 404 mbuf_Free(bp); 405 } 406 break; 407 case PROTO_LQR: 408 if (p) { 409 p->hdlc.lqm.lqr.SaveInLQRs++; 410 lqr_Input(p, bp); 411 } else { 412 log_Printf(LogERROR, "DecodePacket: LQR: Not a physical link !\n"); 413 mbuf_Free(bp); 414 } 415 break; 416 case PROTO_CHAP: 417 if (p) 418 chap_Input(bundle, bp, p); 419 else { 420 log_Printf(LogERROR, "DecodePacket: CHAP: Not a physical link !\n"); 421 mbuf_Free(bp); 422 } 423 break; 424 case PROTO_VJUNCOMP: 425 case PROTO_VJCOMP: 426 bp = vj_Input(&bundle->ncp.ipcp, bp, proto); 427 if (bp == NULL) 428 break; 429 /* fall down */ 430 case PROTO_IP: 431 ip_Input(bundle, bp); 432 break; 433 case PROTO_IPCP: 434 ipcp_Input(&bundle->ncp.ipcp, bundle, bp); 435 break; 436 case PROTO_CCP: 437 ccp_Input(&l->ccp, bundle, bp); 438 break; 439 case PROTO_MP: 440 if (bundle->ncp.mp.active) { 441 if (p) 442 mp_Input(&bundle->ncp.mp, bp, p); 443 else { 444 log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n"); 445 mbuf_Free(bp); 446 } 447 break; 448 } 449 /* Fall through */ 450 default: 451 switch (proto) { 452 case PROTO_MP: 453 case PROTO_COMPD: 454 case PROTO_ICOMPD: 455 type = "Unexpected"; 456 break; 457 default: 458 type = "Unknown"; 459 break; 460 } 461 log_Printf(LogPHASE, "%s protocol 0x%04x (%s)\n", type, proto, 462 hdlc_Protocol2Nam(proto)); 463 bp->offset -= 2; 464 bp->cnt += 2; 465 cp = MBUF_CTOP(bp); 466 lcp_SendProtoRej(&l->lcp, cp, bp->cnt); 467 if (p) { 468 p->hdlc.lqm.SaveInDiscards++; 469 p->hdlc.stats.unknownproto++; 470 } 471 mbuf_Free(bp); 472 break; 473 } 474 } 475 476 static int 477 hdlc_GetProto(const u_char *cp, u_short *proto) 478 { 479 *proto = *cp; 480 if (!(*proto & 1)) { 481 *proto = (*proto << 8) | cp[1]; 482 return 2; 483 } 484 return 1; 485 } 486 487 void 488 hdlc_Input(struct bundle *bundle, struct mbuf * bp, struct physical *physical) 489 { 490 u_short fcs, proto; 491 u_char *cp, addr, ctrl; 492 int n; 493 494 log_DumpBp(LogHDLC, "hdlc_Input:", bp); 495 if (physical_IsSync(physical)) 496 fcs = GOODFCS; 497 else 498 fcs = hdlc_Fcs(INITFCS, MBUF_CTOP(bp), bp->cnt); 499 physical->hdlc.lqm.SaveInOctets += bp->cnt + 1; 500 501 log_Printf(LogDEBUG, "%s: hdlc_Input: fcs = %04x (%s)\n", 502 physical->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 503 if (fcs != GOODFCS) { 504 physical->hdlc.lqm.SaveInErrors++; 505 physical->hdlc.stats.badfcs++; 506 mbuf_Free(bp); 507 return; 508 } 509 if (!physical_IsSync(physical)) 510 bp->cnt -= 2; /* discard FCS part */ 511 512 if (bp->cnt < 2) { /* XXX: raise this bar ? */ 513 mbuf_Free(bp); 514 return; 515 } 516 cp = MBUF_CTOP(bp); 517 518 if (!physical->link.lcp.want_acfcomp) { 519 /* We expect the packet not to be compressed */ 520 addr = *cp++; 521 if (addr != HDLC_ADDR) { 522 physical->hdlc.lqm.SaveInErrors++; 523 physical->hdlc.stats.badaddr++; 524 log_Printf(LogDEBUG, "hdlc_Input: addr %02x\n", *cp); 525 mbuf_Free(bp); 526 return; 527 } 528 ctrl = *cp++; 529 if (ctrl != HDLC_UI) { 530 physical->hdlc.lqm.SaveInErrors++; 531 physical->hdlc.stats.badcommand++; 532 log_Printf(LogDEBUG, "hdlc_Input: %02x\n", *cp); 533 mbuf_Free(bp); 534 return; 535 } 536 bp->offset += 2; 537 bp->cnt -= 2; 538 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 539 /* 540 * We can receive compressed packets, but the peer still sends 541 * uncompressed packets ! 542 */ 543 cp += 2; 544 bp->offset += 2; 545 bp->cnt -= 2; 546 } 547 548 n = hdlc_GetProto(cp, &proto); 549 bp->offset += n; 550 bp->cnt -= n; 551 if (!physical->link.lcp.want_protocomp && n == 1) 552 log_Printf(LogHDLC, "%s: Warning: received a proto-compressed packet !\n", 553 physical->link.name); 554 555 link_ProtocolRecord(&physical->link, proto, PROTO_IN); 556 physical->hdlc.lqm.SaveInPackets++; 557 558 hdlc_DecodePacket(bundle, proto, bp, &physical->link); 559 } 560 561 /* 562 * Detect a HDLC frame 563 */ 564 565 static const char *FrameHeaders[] = { 566 "\176\377\003\300\041", 567 "\176\377\175\043\300\041", 568 "\176\177\175\043\100\041", 569 "\176\175\337\175\043\300\041", 570 "\176\175\137\175\043\100\041", 571 NULL, 572 }; 573 574 u_char * 575 hdlc_Detect(struct physical *physical, u_char *cp, int n) 576 { 577 const char *fp, **hp; 578 char *ptr; 579 580 cp[n] = '\0'; /* be sure to null terminate */ 581 ptr = NULL; 582 for (hp = FrameHeaders; *hp; hp++) { 583 fp = *hp; 584 if (physical_IsSync(physical)) 585 fp++; 586 ptr = strstr((char *)cp, fp); /* XXX: cp may have embedded NULs */ 587 if (ptr) 588 break; 589 } 590 return (u_char *)ptr; 591 } 592 593 int 594 hdlc_ReportStatus(struct cmdargs const *arg) 595 { 596 struct hdlc *hdlc = &arg->cx->physical->hdlc; 597 598 prompt_Printf(arg->prompt, "%s HDLC level errors:\n", arg->cx->name); 599 prompt_Printf(arg->prompt, " Bad Frame Check Sequence fields: %u\n", 600 hdlc->stats.badfcs); 601 prompt_Printf(arg->prompt, " Bad address (!= 0x%02x) fields: %u\n", 602 HDLC_ADDR, hdlc->stats.badaddr); 603 prompt_Printf(arg->prompt, " Bad command (!= 0x%02x) fields: %u\n", 604 HDLC_UI, hdlc->stats.badcommand); 605 prompt_Printf(arg->prompt, " Unrecognised protocol fields: %u\n", 606 hdlc->stats.unknownproto); 607 return 0; 608 } 609 610 static void 611 hdlc_ReportTime(void *v) 612 { 613 /* Moan about HDLC errors */ 614 struct hdlc *hdlc = (struct hdlc *)v; 615 616 timer_Stop(&hdlc->ReportTimer); 617 618 if (memcmp(&hdlc->laststats, &hdlc->stats, sizeof hdlc->stats)) { 619 log_Printf(LogPHASE, 620 "%s: HDLC errors -> FCS: %u, ADDR: %u, COMD: %u, PROTO: %u\n", 621 hdlc->lqm.owner->fsm.link->name, 622 hdlc->stats.badfcs - hdlc->laststats.badfcs, 623 hdlc->stats.badaddr - hdlc->laststats.badaddr, 624 hdlc->stats.badcommand - hdlc->laststats.badcommand, 625 hdlc->stats.unknownproto - hdlc->laststats.unknownproto); 626 hdlc->laststats = hdlc->stats; 627 } 628 629 timer_Start(&hdlc->ReportTimer); 630 } 631 632 void 633 hdlc_StartTimer(struct hdlc *hdlc) 634 { 635 timer_Stop(&hdlc->ReportTimer); 636 hdlc->ReportTimer.load = 60 * SECTICKS; 637 hdlc->ReportTimer.arg = hdlc; 638 hdlc->ReportTimer.func = hdlc_ReportTime; 639 hdlc->ReportTimer.name = "hdlc"; 640 timer_Start(&hdlc->ReportTimer); 641 } 642 643 void 644 hdlc_StopTimer(struct hdlc *hdlc) 645 { 646 timer_Stop(&hdlc->ReportTimer); 647 } 648