1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <netinet/in.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/ip.h> 35 #include <sys/socket.h> 36 #include <sys/un.h> 37 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #include "layer.h" 46 #include "ua.h" 47 #include "defs.h" 48 #include "command.h" 49 #include "mbuf.h" 50 #include "log.h" 51 #include "timer.h" 52 #include "fsm.h" 53 #include "iplist.h" 54 #include "throughput.h" 55 #include "proto.h" 56 #include "descriptor.h" 57 #include "lqr.h" 58 #include "hdlc.h" 59 #include "lcp.h" 60 #include "ccp.h" 61 #include "async.h" 62 #include "link.h" 63 #include "physical.h" 64 #include "prompt.h" 65 #include "slcompress.h" 66 #include "ncpaddr.h" 67 #include "ip.h" 68 #include "ipcp.h" 69 #include "filter.h" 70 #include "mp.h" 71 #include "chat.h" 72 #include "auth.h" 73 #include "chap.h" 74 #include "cbcp.h" 75 #include "datalink.h" 76 #ifndef NORADIUS 77 #include "radius.h" 78 #endif 79 #include "ipv6cp.h" 80 #include "ncp.h" 81 #include "bundle.h" 82 83 /* for received LQRs */ 84 struct lqrreq { 85 u_char type; 86 u_char length; 87 u_short proto; /* Quality protocol */ 88 u_int32_t period; /* Reporting interval */ 89 }; 90 91 static int LcpLayerUp(struct fsm *); 92 static void LcpLayerDown(struct fsm *); 93 static void LcpLayerStart(struct fsm *); 94 static void LcpLayerFinish(struct fsm *); 95 static void LcpInitRestartCounter(struct fsm *, int); 96 static void LcpSendConfigReq(struct fsm *); 97 static void LcpSentTerminateReq(struct fsm *); 98 static void LcpSendTerminateAck(struct fsm *, u_char); 99 static void LcpDecodeConfig(struct fsm *, u_char *, int, int, 100 struct fsm_decode *); 101 102 static struct fsm_callbacks lcp_Callbacks = { 103 LcpLayerUp, 104 LcpLayerDown, 105 LcpLayerStart, 106 LcpLayerFinish, 107 LcpInitRestartCounter, 108 LcpSendConfigReq, 109 LcpSentTerminateReq, 110 LcpSendTerminateAck, 111 LcpDecodeConfig, 112 fsm_NullRecvResetReq, 113 fsm_NullRecvResetAck 114 }; 115 116 static const char * const lcp_TimerNames[] = 117 {"LCP restart", "LCP openmode", "LCP stopped"}; 118 119 static const char * 120 protoname(int proto) 121 { 122 static const char * const cftypes[] = { 123 /* Check out the latest ``Assigned numbers'' rfc (1700) */ 124 NULL, 125 "MRU", /* 1: Maximum-Receive-Unit */ 126 "ACCMAP", /* 2: Async-Control-Character-Map */ 127 "AUTHPROTO", /* 3: Authentication-Protocol */ 128 "QUALPROTO", /* 4: Quality-Protocol */ 129 "MAGICNUM", /* 5: Magic-Number */ 130 "RESERVED", /* 6: RESERVED */ 131 "PROTOCOMP", /* 7: Protocol-Field-Compression */ 132 "ACFCOMP", /* 8: Address-and-Control-Field-Compression */ 133 "FCSALT", /* 9: FCS-Alternatives */ 134 "SDP", /* 10: Self-Describing-Pad */ 135 "NUMMODE", /* 11: Numbered-Mode */ 136 "MULTIPROC", /* 12: Multi-Link-Procedure */ 137 "CALLBACK", /* 13: Callback */ 138 "CONTIME", /* 14: Connect-Time */ 139 "COMPFRAME", /* 15: Compound-Frames */ 140 "NDE", /* 16: Nominal-Data-Encapsulation */ 141 "MRRU", /* 17: Multilink-MRRU */ 142 "SHORTSEQ", /* 18: Multilink-Short-Sequence-Number-Header */ 143 "ENDDISC", /* 19: Multilink-Endpoint-Discriminator */ 144 "PROPRIETRY", /* 20: Proprietary */ 145 "DCEID", /* 21: DCE-Identifier */ 146 "MULTIPP", /* 22: Multi-Link-Plus-Procedure */ 147 "LDBACP", /* 23: Link Discriminator for BACP */ 148 }; 149 150 if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes || 151 cftypes[proto] == NULL) 152 return HexStr(proto, NULL, 0); 153 154 return cftypes[proto]; 155 } 156 157 int 158 lcp_ReportStatus(struct cmdargs const *arg) 159 { 160 struct link *l; 161 struct lcp *lcp; 162 163 l = command_ChooseLink(arg); 164 lcp = &l->lcp; 165 166 prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, lcp->fsm.name, 167 State2Nam(lcp->fsm.state)); 168 prompt_Printf(arg->prompt, 169 " his side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n" 170 " MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n", 171 lcp->his_mru, (u_long)lcp->his_accmap, 172 lcp->his_protocomp ? "on" : "off", 173 lcp->his_acfcomp ? "on" : "off", 174 (u_long)lcp->his_magic, lcp->his_mrru, 175 lcp->his_shortseq ? "on" : "off", lcp->his_reject); 176 prompt_Printf(arg->prompt, 177 " my side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n" 178 " MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n", 179 lcp->want_mru, (u_long)lcp->want_accmap, 180 lcp->want_protocomp ? "on" : "off", 181 lcp->want_acfcomp ? "on" : "off", 182 (u_long)lcp->want_magic, lcp->want_mrru, 183 lcp->want_shortseq ? "on" : "off", lcp->my_reject); 184 185 if (lcp->cfg.mru) 186 prompt_Printf(arg->prompt, "\n Defaults: MRU = %d (max %d), ", 187 lcp->cfg.mru, lcp->cfg.max_mru); 188 else 189 prompt_Printf(arg->prompt, "\n Defaults: MRU = any (max %d), ", 190 lcp->cfg.max_mru); 191 if (lcp->cfg.mtu) 192 prompt_Printf(arg->prompt, "MTU = %d (max %d), ", 193 lcp->cfg.mtu, lcp->cfg.max_mtu); 194 else 195 prompt_Printf(arg->prompt, "MTU = any (max %d), ", lcp->cfg.max_mtu); 196 prompt_Printf(arg->prompt, "ACCMAP = %08lx\n", (u_long)lcp->cfg.accmap); 197 prompt_Printf(arg->prompt, " LQR period = %us, ", 198 lcp->cfg.lqrperiod); 199 prompt_Printf(arg->prompt, "Open Mode = %s", 200 lcp->cfg.openmode == OPEN_PASSIVE ? "passive" : "active"); 201 if (lcp->cfg.openmode > 0) 202 prompt_Printf(arg->prompt, " (delay %ds)", lcp->cfg.openmode); 203 prompt_Printf(arg->prompt, "\n FSM retry = %us, max %u Config" 204 " REQ%s, %u Term REQ%s\n", lcp->cfg.fsm.timeout, 205 lcp->cfg.fsm.maxreq, lcp->cfg.fsm.maxreq == 1 ? "" : "s", 206 lcp->cfg.fsm.maxtrm, lcp->cfg.fsm.maxtrm == 1 ? "" : "s"); 207 prompt_Printf(arg->prompt, " Ident: %s\n", lcp->cfg.ident); 208 prompt_Printf(arg->prompt, "\n Negotiation:\n"); 209 prompt_Printf(arg->prompt, " ACFCOMP = %s\n", 210 command_ShowNegval(lcp->cfg.acfcomp)); 211 prompt_Printf(arg->prompt, " CHAP = %s\n", 212 command_ShowNegval(lcp->cfg.chap05)); 213 #ifdef HAVE_DES 214 prompt_Printf(arg->prompt, " CHAP80 = %s\n", 215 command_ShowNegval(lcp->cfg.chap80nt)); 216 prompt_Printf(arg->prompt, " LANMan = %s\n", 217 command_ShowNegval(lcp->cfg.chap80lm)); 218 prompt_Printf(arg->prompt, " CHAP81 = %s\n", 219 command_ShowNegval(lcp->cfg.chap81)); 220 #endif 221 prompt_Printf(arg->prompt, " LQR = %s\n", 222 command_ShowNegval(lcp->cfg.lqr)); 223 prompt_Printf(arg->prompt, " PAP = %s\n", 224 command_ShowNegval(lcp->cfg.pap)); 225 prompt_Printf(arg->prompt, " PROTOCOMP = %s\n", 226 command_ShowNegval(lcp->cfg.protocomp)); 227 228 return 0; 229 } 230 231 static u_int32_t 232 GenerateMagic(void) 233 { 234 /* Generate random number which will be used as magic number */ 235 randinit(); 236 return random(); 237 } 238 239 void 240 lcp_SetupCallbacks(struct lcp *lcp) 241 { 242 lcp->fsm.fn = &lcp_Callbacks; 243 lcp->fsm.FsmTimer.name = lcp_TimerNames[0]; 244 lcp->fsm.OpenTimer.name = lcp_TimerNames[1]; 245 lcp->fsm.StoppedTimer.name = lcp_TimerNames[2]; 246 } 247 248 void 249 lcp_Init(struct lcp *lcp, struct bundle *bundle, struct link *l, 250 const struct fsm_parent *parent) 251 { 252 /* Initialise ourselves */ 253 int mincode = parent ? 1 : LCP_MINMPCODE; 254 255 fsm_Init(&lcp->fsm, "LCP", PROTO_LCP, mincode, LCP_MAXCODE, LogLCP, 256 bundle, l, parent, &lcp_Callbacks, lcp_TimerNames); 257 258 lcp->cfg.mru = 0; 259 lcp->cfg.max_mru = MAX_MRU; 260 lcp->cfg.mtu = 0; 261 lcp->cfg.max_mtu = MAX_MTU; 262 lcp->cfg.accmap = 0; 263 lcp->cfg.openmode = 1; 264 lcp->cfg.lqrperiod = DEF_LQRPERIOD; 265 lcp->cfg.fsm.timeout = DEF_FSMRETRY; 266 lcp->cfg.fsm.maxreq = DEF_FSMTRIES; 267 lcp->cfg.fsm.maxtrm = DEF_FSMTRIES; 268 269 lcp->cfg.acfcomp = NEG_ENABLED|NEG_ACCEPTED; 270 lcp->cfg.chap05 = NEG_ACCEPTED; 271 #ifdef HAVE_DES 272 lcp->cfg.chap80nt = NEG_ACCEPTED; 273 lcp->cfg.chap80lm = 0; 274 lcp->cfg.chap81 = NEG_ACCEPTED; 275 #endif 276 lcp->cfg.lqr = NEG_ACCEPTED; 277 lcp->cfg.pap = NEG_ACCEPTED; 278 lcp->cfg.protocomp = NEG_ENABLED|NEG_ACCEPTED; 279 *lcp->cfg.ident = '\0'; 280 281 lcp_Setup(lcp, lcp->cfg.openmode); 282 } 283 284 void 285 lcp_Setup(struct lcp *lcp, int openmode) 286 { 287 struct physical *p = link2physical(lcp->fsm.link); 288 289 lcp->fsm.open_mode = openmode; 290 291 lcp->his_mru = DEF_MRU; 292 lcp->his_mrru = 0; 293 lcp->his_magic = 0; 294 lcp->his_lqrperiod = 0; 295 lcp->his_acfcomp = 0; 296 lcp->his_auth = 0; 297 lcp->his_authtype = 0; 298 lcp->his_callback.opmask = 0; 299 lcp->his_shortseq = 0; 300 lcp->mru_req = 0; 301 302 if ((lcp->want_mru = lcp->cfg.mru) == 0) 303 lcp->want_mru = DEF_MRU; 304 lcp->want_mrru = lcp->fsm.bundle->ncp.mp.cfg.mrru; 305 lcp->want_shortseq = IsEnabled(lcp->fsm.bundle->ncp.mp.cfg.shortseq) ? 1 : 0; 306 lcp->want_acfcomp = IsEnabled(lcp->cfg.acfcomp) ? 1 : 0; 307 308 if (lcp->fsm.parent) { 309 lcp->his_accmap = 0xffffffff; 310 lcp->want_accmap = lcp->cfg.accmap; 311 lcp->his_protocomp = 0; 312 lcp->want_protocomp = IsEnabled(lcp->cfg.protocomp) ? 1 : 0; 313 lcp->want_magic = GenerateMagic(); 314 315 if (IsEnabled(lcp->cfg.chap05)) { 316 lcp->want_auth = PROTO_CHAP; 317 lcp->want_authtype = 0x05; 318 #ifdef HAVE_DES 319 } else if (IsEnabled(lcp->cfg.chap80nt) || 320 IsEnabled(lcp->cfg.chap80lm)) { 321 lcp->want_auth = PROTO_CHAP; 322 lcp->want_authtype = 0x80; 323 } else if (IsEnabled(lcp->cfg.chap81)) { 324 lcp->want_auth = PROTO_CHAP; 325 lcp->want_authtype = 0x81; 326 #endif 327 } else if (IsEnabled(lcp->cfg.pap)) { 328 lcp->want_auth = PROTO_PAP; 329 lcp->want_authtype = 0; 330 } else { 331 lcp->want_auth = 0; 332 lcp->want_authtype = 0; 333 } 334 335 if (p->type != PHYS_DIRECT) 336 memcpy(&lcp->want_callback, &p->dl->cfg.callback, 337 sizeof(struct callback)); 338 else 339 lcp->want_callback.opmask = 0; 340 lcp->want_lqrperiod = IsEnabled(lcp->cfg.lqr) ? 341 lcp->cfg.lqrperiod * 100 : 0; 342 } else { 343 lcp->his_accmap = lcp->want_accmap = 0; 344 lcp->his_protocomp = lcp->want_protocomp = 1; 345 lcp->want_magic = 0; 346 lcp->want_auth = 0; 347 lcp->want_authtype = 0; 348 lcp->want_callback.opmask = 0; 349 lcp->want_lqrperiod = 0; 350 } 351 352 lcp->his_reject = lcp->my_reject = 0; 353 lcp->auth_iwait = lcp->auth_ineed = 0; 354 lcp->LcpFailedMagic = 0; 355 } 356 357 static void 358 LcpInitRestartCounter(struct fsm *fp, int what) 359 { 360 /* Set fsm timer load */ 361 struct lcp *lcp = fsm2lcp(fp); 362 363 fp->FsmTimer.load = lcp->cfg.fsm.timeout * SECTICKS; 364 switch (what) { 365 case FSM_REQ_TIMER: 366 fp->restart = lcp->cfg.fsm.maxreq; 367 break; 368 case FSM_TRM_TIMER: 369 fp->restart = lcp->cfg.fsm.maxtrm; 370 break; 371 default: 372 fp->restart = 1; 373 break; 374 } 375 } 376 377 static void 378 LcpSendConfigReq(struct fsm *fp) 379 { 380 /* Send config REQ please */ 381 struct physical *p = link2physical(fp->link); 382 struct lcp *lcp = fsm2lcp(fp); 383 u_char buff[200]; 384 struct lcp_opt *o; 385 struct mp *mp; 386 u_int16_t proto; 387 u_short maxmru; 388 389 if (!p) { 390 log_Printf(LogERROR, "%s: LcpSendConfigReq: Not a physical link !\n", 391 fp->link->name); 392 return; 393 } 394 395 o = (struct lcp_opt *)buff; 396 if (!physical_IsSync(p)) { 397 if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP)) 398 INC_LCP_OPT(TY_ACFCOMP, 2, o); 399 400 if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP)) 401 INC_LCP_OPT(TY_PROTOCOMP, 2, o); 402 403 if (!REJECTED(lcp, TY_ACCMAP)) { 404 ua_htonl(&lcp->want_accmap, o->data); 405 INC_LCP_OPT(TY_ACCMAP, 6, o); 406 } 407 } 408 409 maxmru = p ? physical_DeviceMTU(p) : 0; 410 if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru)) 411 maxmru = lcp->cfg.max_mru; 412 if (maxmru && lcp->want_mru > maxmru) { 413 log_Printf(LogWARN, "%s: Reducing configured MRU from %u to %u\n", 414 fp->link->name, lcp->want_mru, maxmru); 415 lcp->want_mru = maxmru; 416 } 417 if (!REJECTED(lcp, TY_MRU)) { 418 ua_htons(&lcp->want_mru, o->data); 419 INC_LCP_OPT(TY_MRU, 4, o); 420 } 421 422 if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM)) { 423 ua_htonl(&lcp->want_magic, o->data); 424 INC_LCP_OPT(TY_MAGICNUM, 6, o); 425 } 426 427 if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO)) { 428 proto = PROTO_LQR; 429 ua_htons(&proto, o->data); 430 ua_htonl(&lcp->want_lqrperiod, o->data + 2); 431 INC_LCP_OPT(TY_QUALPROTO, 8, o); 432 } 433 434 switch (lcp->want_auth) { 435 case PROTO_PAP: 436 proto = PROTO_PAP; 437 ua_htons(&proto, o->data); 438 INC_LCP_OPT(TY_AUTHPROTO, 4, o); 439 break; 440 441 case PROTO_CHAP: 442 proto = PROTO_CHAP; 443 ua_htons(&proto, o->data); 444 o->data[2] = lcp->want_authtype; 445 INC_LCP_OPT(TY_AUTHPROTO, 5, o); 446 break; 447 } 448 449 if (!REJECTED(lcp, TY_CALLBACK)) { 450 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) { 451 *o->data = CALLBACK_AUTH; 452 INC_LCP_OPT(TY_CALLBACK, 3, o); 453 } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) { 454 *o->data = CALLBACK_CBCP; 455 INC_LCP_OPT(TY_CALLBACK, 3, o); 456 } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164)) { 457 int sz = strlen(lcp->want_callback.msg); 458 459 if (sz > sizeof o->data - 1) { 460 sz = sizeof o->data - 1; 461 log_Printf(LogWARN, "Truncating E164 data to %d octets (oops!)\n", sz); 462 } 463 *o->data = CALLBACK_E164; 464 memcpy(o->data + 1, lcp->want_callback.msg, sz); 465 INC_LCP_OPT(TY_CALLBACK, sz + 3, o); 466 } 467 } 468 469 if (lcp->want_mrru && !REJECTED(lcp, TY_MRRU)) { 470 ua_htons(&lcp->want_mrru, o->data); 471 INC_LCP_OPT(TY_MRRU, 4, o); 472 473 if (lcp->want_shortseq && !REJECTED(lcp, TY_SHORTSEQ)) 474 INC_LCP_OPT(TY_SHORTSEQ, 2, o); 475 } 476 477 mp = &lcp->fsm.bundle->ncp.mp; 478 if (mp->cfg.enddisc.class != 0 && IsEnabled(mp->cfg.negenddisc) && 479 !REJECTED(lcp, TY_ENDDISC)) { 480 *o->data = mp->cfg.enddisc.class; 481 memcpy(o->data+1, mp->cfg.enddisc.address, mp->cfg.enddisc.len); 482 INC_LCP_OPT(TY_ENDDISC, mp->cfg.enddisc.len + 3, o); 483 } 484 485 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 486 MB_LCPOUT); 487 } 488 489 void 490 lcp_SendProtoRej(struct lcp *lcp, u_char *option, int count) 491 { 492 /* Don't understand `option' */ 493 fsm_Output(&lcp->fsm, CODE_PROTOREJ, lcp->fsm.reqid, option, count, 494 MB_LCPOUT); 495 } 496 497 int 498 lcp_SendIdentification(struct lcp *lcp) 499 { 500 static u_char id; /* Use a private id */ 501 u_char msg[DEF_MRU - 3]; 502 const char *argv[2]; 503 char *exp[2]; 504 505 if (*lcp->cfg.ident == '\0') 506 return 0; 507 508 argv[0] = lcp->cfg.ident; 509 argv[1] = NULL; 510 511 command_Expand(exp, 1, argv, lcp->fsm.bundle, 1, getpid()); 512 513 ua_htonl(&lcp->want_magic, msg); 514 strncpy(msg + 4, exp[0], sizeof msg - 5); 515 msg[sizeof msg - 1] = '\0'; 516 517 log_Printf(LogLCP, "Sending ident magic %08x text %s\n", lcp->want_magic, 518 msg + 4); 519 fsm_Output(&lcp->fsm, CODE_IDENT, id++, msg, 4 + strlen(msg + 4), MB_LCPOUT); 520 521 free(exp[0]); 522 return 1; 523 } 524 525 void 526 lcp_RecvIdentification(struct lcp *lcp, char *data) 527 { 528 log_Printf(LogLCP, "Received ident: %s\n", data); 529 } 530 531 static void 532 LcpSentTerminateReq(struct fsm *fp) 533 { 534 /* Term REQ just sent by FSM */ 535 } 536 537 static void 538 LcpSendTerminateAck(struct fsm *fp, u_char id) 539 { 540 /* Send Term ACK please */ 541 struct physical *p = link2physical(fp->link); 542 543 if (p && p->dl->state == DATALINK_CBCP) 544 cbcp_ReceiveTerminateReq(p); 545 546 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_LCPOUT); 547 } 548 549 static void 550 LcpLayerStart(struct fsm *fp) 551 { 552 /* We're about to start up ! */ 553 struct lcp *lcp = fsm2lcp(fp); 554 555 log_Printf(LogLCP, "%s: LayerStart\n", fp->link->name); 556 lcp->LcpFailedMagic = 0; 557 fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3; 558 lcp->mru_req = 0; 559 } 560 561 static void 562 LcpLayerFinish(struct fsm *fp) 563 { 564 /* We're now down */ 565 log_Printf(LogLCP, "%s: LayerFinish\n", fp->link->name); 566 } 567 568 static int 569 LcpLayerUp(struct fsm *fp) 570 { 571 /* We're now up */ 572 struct physical *p = link2physical(fp->link); 573 struct lcp *lcp = fsm2lcp(fp); 574 575 log_Printf(LogLCP, "%s: LayerUp\n", fp->link->name); 576 async_SetLinkParams(&p->async, lcp); 577 lqr_Start(lcp); 578 hdlc_StartTimer(&p->hdlc); 579 fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3; 580 581 lcp_SendIdentification(lcp); 582 583 return 1; 584 } 585 586 static void 587 LcpLayerDown(struct fsm *fp) 588 { 589 /* About to come down */ 590 struct physical *p = link2physical(fp->link); 591 592 log_Printf(LogLCP, "%s: LayerDown\n", fp->link->name); 593 hdlc_StopTimer(&p->hdlc); 594 lqr_StopTimer(p); 595 lcp_Setup(fsm2lcp(fp), 0); 596 } 597 598 static int 599 E164ok(struct callback *cb, char *req, int sz) 600 { 601 char list[sizeof cb->msg], *next; 602 int len; 603 604 if (!strcmp(cb->msg, "*")) 605 return 1; 606 607 strncpy(list, cb->msg, sizeof list - 1); 608 list[sizeof list - 1] = '\0'; 609 for (next = strtok(list, ","); next; next = strtok(NULL, ",")) { 610 len = strlen(next); 611 if (sz == len && !memcmp(list, req, sz)) 612 return 1; 613 } 614 return 0; 615 } 616 617 static void 618 LcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type, 619 struct fsm_decode *dec) 620 { 621 /* Deal with incoming PROTO_LCP */ 622 struct lcp *lcp = fsm2lcp(fp); 623 int type, length, sz, pos, op, callback_req; 624 u_int32_t magic, accmap; 625 u_short mru, phmtu, maxmtu, maxmru, wantmtu, wantmru, proto; 626 struct lqrreq *req; 627 char request[20], desc[22]; 628 struct mp *mp; 629 struct physical *p = link2physical(fp->link); 630 631 sz = op = callback_req = 0; 632 633 while (plen >= sizeof(struct fsmconfig)) { 634 type = *cp; 635 length = cp[1]; 636 637 snprintf(request, sizeof request, " %s[%d]", protoname(type), length); 638 639 if (length < 2) { 640 log_Printf(LogLCP, "%s:%s: Bad LCP length\n", fp->link->name, request); 641 break; 642 } 643 644 switch (type) { 645 case TY_MRRU: 646 mp = &lcp->fsm.bundle->ncp.mp; 647 ua_ntohs(cp + 2, &mru); 648 log_Printf(LogLCP, "%s %u\n", request, mru); 649 650 switch (mode_type) { 651 case MODE_REQ: 652 if (mp->cfg.mrru) { 653 if (REJECTED(lcp, TY_MRRU)) 654 /* Ignore his previous reject so that we REQ next time */ 655 lcp->his_reject &= ~(1 << type); 656 657 if (mru > MAX_MRU) { 658 /* Push him down to MAX_MRU */ 659 lcp->his_mrru = MAX_MRU; 660 memcpy(dec->nakend, cp, 2); 661 ua_htons(&lcp->his_mrru, dec->nakend + 2); 662 dec->nakend += 4; 663 } else if (mru < MIN_MRU) { 664 /* Push him up to MIN_MRU */ 665 lcp->his_mrru = MIN_MRU; 666 memcpy(dec->nakend, cp, 2); 667 ua_htons(&lcp->his_mrru, dec->nakend + 2); 668 dec->nakend += 4; 669 } else { 670 lcp->his_mrru = mru; 671 memcpy(dec->ackend, cp, 4); 672 dec->ackend += 4; 673 } 674 break; 675 } else 676 goto reqreject; 677 break; 678 case MODE_NAK: 679 if (mp->cfg.mrru) { 680 if (REJECTED(lcp, TY_MRRU)) 681 /* Must have changed his mind ! */ 682 lcp->his_reject &= ~(1 << type); 683 684 if (mru > MAX_MRU) 685 lcp->want_mrru = MAX_MRU; 686 else if (mru < MIN_MRU) 687 lcp->want_mrru = MIN_MRU; 688 else 689 lcp->want_mrru = mru; 690 } 691 /* else we honour our config and don't send the suggested REQ */ 692 break; 693 case MODE_REJ: 694 lcp->his_reject |= (1 << type); 695 lcp->want_mrru = 0; /* Ah well, no multilink :-( */ 696 break; 697 } 698 break; 699 700 case TY_MRU: 701 lcp->mru_req = 1; 702 ua_ntohs(cp + 2, &mru); 703 log_Printf(LogLCP, "%s %d\n", request, mru); 704 705 switch (mode_type) { 706 case MODE_REQ: 707 maxmtu = p ? physical_DeviceMTU(p) : 0; 708 if (lcp->cfg.max_mtu && (!maxmtu || maxmtu > lcp->cfg.max_mtu)) 709 maxmtu = lcp->cfg.max_mtu; 710 wantmtu = lcp->cfg.mtu; 711 if (maxmtu && wantmtu > maxmtu) { 712 log_Printf(LogWARN, "%s: Reducing configured MTU from %u to %u\n", 713 fp->link->name, wantmtu, maxmtu); 714 wantmtu = maxmtu; 715 } 716 717 if (maxmtu && mru > maxmtu) { 718 lcp->his_mru = maxmtu; 719 memcpy(dec->nakend, cp, 2); 720 ua_htons(&lcp->his_mru, dec->nakend + 2); 721 dec->nakend += 4; 722 } else if (wantmtu && mru < wantmtu) { 723 /* Push him up to MTU or MIN_MRU */ 724 lcp->his_mru = wantmtu; 725 memcpy(dec->nakend, cp, 2); 726 ua_htons(&lcp->his_mru, dec->nakend + 2); 727 dec->nakend += 4; 728 } else { 729 lcp->his_mru = mru; 730 memcpy(dec->ackend, cp, 4); 731 dec->ackend += 4; 732 } 733 break; 734 case MODE_NAK: 735 maxmru = p ? physical_DeviceMTU(p) : 0; 736 if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru)) 737 maxmru = lcp->cfg.max_mru; 738 wantmru = lcp->cfg.mru > maxmru ? maxmru : lcp->cfg.mru; 739 740 if (wantmru && mru > wantmru) 741 lcp->want_mru = wantmru; 742 else if (mru > maxmru) 743 lcp->want_mru = maxmru; 744 else if (mru < MIN_MRU) 745 lcp->want_mru = MIN_MRU; 746 else 747 lcp->want_mru = mru; 748 break; 749 case MODE_REJ: 750 lcp->his_reject |= (1 << type); 751 break; 752 } 753 break; 754 755 case TY_ACCMAP: 756 ua_ntohl(cp + 2, &accmap); 757 log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)accmap); 758 759 switch (mode_type) { 760 case MODE_REQ: 761 lcp->his_accmap = accmap; 762 memcpy(dec->ackend, cp, 6); 763 dec->ackend += 6; 764 break; 765 case MODE_NAK: 766 lcp->want_accmap = accmap; 767 break; 768 case MODE_REJ: 769 lcp->his_reject |= (1 << type); 770 break; 771 } 772 break; 773 774 case TY_AUTHPROTO: 775 ua_ntohs(cp + 2, &proto); 776 log_Printf(LogLCP, "%s 0x%04x (%s)\n", request, proto, 777 Auth2Nam(proto, length > 4 ? cp[4] : 0)); 778 779 switch (mode_type) { 780 case MODE_REQ: 781 switch (proto) { 782 case PROTO_PAP: 783 if (length != 4) { 784 log_Printf(LogLCP, " Bad length!\n"); 785 goto reqreject; 786 } 787 if (IsAccepted(lcp->cfg.pap)) { 788 lcp->his_auth = proto; 789 lcp->his_authtype = 0; 790 memcpy(dec->ackend, cp, length); 791 dec->ackend += length; 792 } else if (IsAccepted(lcp->cfg.chap05)) { 793 *dec->nakend++ = *cp; 794 *dec->nakend++ = 5; 795 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 796 *dec->nakend++ = (unsigned char) PROTO_CHAP; 797 *dec->nakend++ = 0x05; 798 #ifdef HAVE_DES 799 } else if (IsAccepted(lcp->cfg.chap80nt) || 800 IsAccepted(lcp->cfg.chap80lm)) { 801 *dec->nakend++ = *cp; 802 *dec->nakend++ = 5; 803 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 804 *dec->nakend++ = (unsigned char) PROTO_CHAP; 805 *dec->nakend++ = 0x80; 806 } else if (IsAccepted(lcp->cfg.chap81)) { 807 *dec->nakend++ = *cp; 808 *dec->nakend++ = 5; 809 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 810 *dec->nakend++ = (unsigned char) PROTO_CHAP; 811 *dec->nakend++ = 0x81; 812 #endif 813 } else 814 goto reqreject; 815 break; 816 817 case PROTO_CHAP: 818 if (length != 5) { 819 log_Printf(LogLCP, " Bad length!\n"); 820 goto reqreject; 821 } 822 if ((cp[4] == 0x05 && IsAccepted(lcp->cfg.chap05)) 823 #ifdef HAVE_DES 824 || (cp[4] == 0x80 && (IsAccepted(lcp->cfg.chap80nt) || 825 (IsAccepted(lcp->cfg.chap80lm)))) 826 || (cp[4] == 0x81 && IsAccepted(lcp->cfg.chap81)) 827 #endif 828 ) { 829 lcp->his_auth = proto; 830 lcp->his_authtype = cp[4]; 831 memcpy(dec->ackend, cp, length); 832 dec->ackend += length; 833 } else { 834 #ifndef HAVE_DES 835 if (cp[4] == 0x80) { 836 log_Printf(LogWARN, "CHAP 0x80 not available without DES\n"); 837 } else if (cp[4] == 0x81) { 838 log_Printf(LogWARN, "CHAP 0x81 not available without DES\n"); 839 } else 840 #endif 841 if (cp[4] != 0x05) 842 log_Printf(LogWARN, "%s not supported\n", 843 Auth2Nam(PROTO_CHAP, cp[4])); 844 845 if (IsAccepted(lcp->cfg.chap05)) { 846 *dec->nakend++ = *cp; 847 *dec->nakend++ = 5; 848 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 849 *dec->nakend++ = (unsigned char) PROTO_CHAP; 850 *dec->nakend++ = 0x05; 851 #ifdef HAVE_DES 852 } else if (IsAccepted(lcp->cfg.chap80nt) || 853 IsAccepted(lcp->cfg.chap80lm)) { 854 *dec->nakend++ = *cp; 855 *dec->nakend++ = 5; 856 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 857 *dec->nakend++ = (unsigned char) PROTO_CHAP; 858 *dec->nakend++ = 0x80; 859 } else if (IsAccepted(lcp->cfg.chap81)) { 860 *dec->nakend++ = *cp; 861 *dec->nakend++ = 5; 862 *dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8); 863 *dec->nakend++ = (unsigned char) PROTO_CHAP; 864 *dec->nakend++ = 0x81; 865 #endif 866 } else if (IsAccepted(lcp->cfg.pap)) { 867 *dec->nakend++ = *cp; 868 *dec->nakend++ = 4; 869 *dec->nakend++ = (unsigned char) (PROTO_PAP >> 8); 870 *dec->nakend++ = (unsigned char) PROTO_PAP; 871 } else 872 goto reqreject; 873 } 874 break; 875 876 default: 877 log_Printf(LogLCP, "%s 0x%04x - not recognised, NAK\n", 878 request, proto); 879 memcpy(dec->nakend, cp, length); 880 dec->nakend += length; 881 break; 882 } 883 break; 884 case MODE_NAK: 885 switch (proto) { 886 case PROTO_PAP: 887 if (IsEnabled(lcp->cfg.pap)) { 888 lcp->want_auth = PROTO_PAP; 889 lcp->want_authtype = 0; 890 } else { 891 log_Printf(LogLCP, "Peer will only send PAP (not enabled)\n"); 892 lcp->his_reject |= (1 << type); 893 } 894 break; 895 case PROTO_CHAP: 896 if (cp[4] == 0x05 && IsEnabled(lcp->cfg.chap05)) { 897 lcp->want_auth = PROTO_CHAP; 898 lcp->want_authtype = 0x05; 899 #ifdef HAVE_DES 900 } else if (cp[4] == 0x80 && (IsEnabled(lcp->cfg.chap80nt) || 901 IsEnabled(lcp->cfg.chap80lm))) { 902 lcp->want_auth = PROTO_CHAP; 903 lcp->want_authtype = 0x80; 904 } else if (cp[4] == 0x81 && IsEnabled(lcp->cfg.chap81)) { 905 lcp->want_auth = PROTO_CHAP; 906 lcp->want_authtype = 0x81; 907 #endif 908 } else { 909 #ifndef HAVE_DES 910 if (cp[4] == 0x80) { 911 log_Printf(LogLCP, "Peer will only send MSCHAP (not available" 912 " without DES)\n"); 913 } else if (cp[4] == 0x81) { 914 log_Printf(LogLCP, "Peer will only send MSCHAPV2 (not available" 915 " without DES)\n"); 916 } else 917 #endif 918 log_Printf(LogLCP, "Peer will only send %s (not %s)\n", 919 Auth2Nam(PROTO_CHAP, cp[4]), 920 #ifdef HAVE_DES 921 (cp[4] == 0x80 || cp[4] == 0x81) ? "configured" : 922 #endif 923 "supported"); 924 lcp->his_reject |= (1 << type); 925 } 926 break; 927 default: 928 /* We've been NAK'd with something we don't understand :-( */ 929 lcp->his_reject |= (1 << type); 930 break; 931 } 932 break; 933 case MODE_REJ: 934 lcp->his_reject |= (1 << type); 935 break; 936 } 937 break; 938 939 case TY_QUALPROTO: 940 req = (struct lqrreq *)cp; 941 log_Printf(LogLCP, "%s proto %x, interval %lums\n", 942 request, ntohs(req->proto), (u_long)ntohl(req->period) * 10); 943 switch (mode_type) { 944 case MODE_REQ: 945 if (ntohs(req->proto) != PROTO_LQR || !IsAccepted(lcp->cfg.lqr)) 946 goto reqreject; 947 else { 948 lcp->his_lqrperiod = ntohl(req->period); 949 if (lcp->his_lqrperiod < MIN_LQRPERIOD * 100) 950 lcp->his_lqrperiod = MIN_LQRPERIOD * 100; 951 req->period = htonl(lcp->his_lqrperiod); 952 memcpy(dec->ackend, cp, length); 953 dec->ackend += length; 954 } 955 break; 956 case MODE_NAK: 957 break; 958 case MODE_REJ: 959 lcp->his_reject |= (1 << type); 960 break; 961 } 962 break; 963 964 case TY_MAGICNUM: 965 ua_ntohl(cp + 2, &magic); 966 log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)magic); 967 968 switch (mode_type) { 969 case MODE_REQ: 970 if (lcp->want_magic) { 971 /* Validate magic number */ 972 if (magic == lcp->want_magic) { 973 sigset_t emptyset; 974 975 log_Printf(LogLCP, "Magic is same (%08lx) - %d times\n", 976 (u_long)magic, ++lcp->LcpFailedMagic); 977 lcp->want_magic = GenerateMagic(); 978 memcpy(dec->nakend, cp, 6); 979 dec->nakend += 6; 980 ualarm(TICKUNIT * (4 + 4 * lcp->LcpFailedMagic), 0); 981 sigemptyset(&emptyset); 982 sigsuspend(&emptyset); 983 } else { 984 lcp->his_magic = magic; 985 memcpy(dec->ackend, cp, length); 986 dec->ackend += length; 987 lcp->LcpFailedMagic = 0; 988 } 989 } else { 990 goto reqreject; 991 } 992 break; 993 case MODE_NAK: 994 log_Printf(LogLCP, " Magic 0x%08lx is NAKed!\n", (u_long)magic); 995 lcp->want_magic = GenerateMagic(); 996 break; 997 case MODE_REJ: 998 log_Printf(LogLCP, " Magic 0x%08x is REJected!\n", magic); 999 lcp->want_magic = 0; 1000 lcp->his_reject |= (1 << type); 1001 break; 1002 } 1003 break; 1004 1005 case TY_PROTOCOMP: 1006 log_Printf(LogLCP, "%s\n", request); 1007 1008 switch (mode_type) { 1009 case MODE_REQ: 1010 if (IsAccepted(lcp->cfg.protocomp)) { 1011 lcp->his_protocomp = 1; 1012 memcpy(dec->ackend, cp, 2); 1013 dec->ackend += 2; 1014 } else { 1015 #ifdef OLDMST 1016 /* MorningStar before v1.3 needs NAK */ 1017 memcpy(dec->nakend, cp, 2); 1018 dec->nakend += 2; 1019 #else 1020 goto reqreject; 1021 #endif 1022 } 1023 break; 1024 case MODE_NAK: 1025 case MODE_REJ: 1026 lcp->want_protocomp = 0; 1027 lcp->his_reject |= (1 << type); 1028 break; 1029 } 1030 break; 1031 1032 case TY_ACFCOMP: 1033 log_Printf(LogLCP, "%s\n", request); 1034 switch (mode_type) { 1035 case MODE_REQ: 1036 if (IsAccepted(lcp->cfg.acfcomp)) { 1037 lcp->his_acfcomp = 1; 1038 memcpy(dec->ackend, cp, 2); 1039 dec->ackend += 2; 1040 } else { 1041 #ifdef OLDMST 1042 /* MorningStar before v1.3 needs NAK */ 1043 memcpy(dec->nakend, cp, 2); 1044 dec->nakend += 2; 1045 #else 1046 goto reqreject; 1047 #endif 1048 } 1049 break; 1050 case MODE_NAK: 1051 case MODE_REJ: 1052 lcp->want_acfcomp = 0; 1053 lcp->his_reject |= (1 << type); 1054 break; 1055 } 1056 break; 1057 1058 case TY_SDP: 1059 log_Printf(LogLCP, "%s\n", request); 1060 switch (mode_type) { 1061 case MODE_REQ: 1062 case MODE_NAK: 1063 case MODE_REJ: 1064 break; 1065 } 1066 break; 1067 1068 case TY_CALLBACK: 1069 if (length == 2) 1070 op = CALLBACK_NONE; 1071 else 1072 op = (int)cp[2]; 1073 sz = length - 3; 1074 switch (op) { 1075 case CALLBACK_AUTH: 1076 log_Printf(LogLCP, "%s Auth\n", request); 1077 break; 1078 case CALLBACK_DIALSTRING: 1079 log_Printf(LogLCP, "%s Dialstring %.*s\n", request, sz, cp + 3); 1080 break; 1081 case CALLBACK_LOCATION: 1082 log_Printf(LogLCP, "%s Location %.*s\n", request, sz, cp + 3); 1083 break; 1084 case CALLBACK_E164: 1085 log_Printf(LogLCP, "%s E.164 (%.*s)\n", request, sz, cp + 3); 1086 break; 1087 case CALLBACK_NAME: 1088 log_Printf(LogLCP, "%s Name %.*s\n", request, sz, cp + 3); 1089 break; 1090 case CALLBACK_CBCP: 1091 log_Printf(LogLCP, "%s CBCP\n", request); 1092 break; 1093 default: 1094 log_Printf(LogLCP, "%s ???\n", request); 1095 break; 1096 } 1097 1098 switch (mode_type) { 1099 case MODE_REQ: 1100 callback_req = 1; 1101 if (p->type != PHYS_DIRECT) 1102 goto reqreject; 1103 if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(op)) && 1104 (op != CALLBACK_AUTH || p->link.lcp.want_auth) && 1105 (op != CALLBACK_E164 || 1106 E164ok(&p->dl->cfg.callback, cp + 3, sz))) { 1107 lcp->his_callback.opmask = CALLBACK_BIT(op); 1108 if (sz > sizeof lcp->his_callback.msg - 1) { 1109 sz = sizeof lcp->his_callback.msg - 1; 1110 log_Printf(LogWARN, "Truncating option arg to %d octets\n", sz); 1111 } 1112 memcpy(lcp->his_callback.msg, cp + 3, sz); 1113 lcp->his_callback.msg[sz] = '\0'; 1114 memcpy(dec->ackend, cp, sz + 3); 1115 dec->ackend += sz + 3; 1116 } else if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) && 1117 p->link.lcp.auth_ineed) { 1118 *dec->nakend++ = *cp; 1119 *dec->nakend++ = 3; 1120 *dec->nakend++ = CALLBACK_AUTH; 1121 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) { 1122 *dec->nakend++ = *cp; 1123 *dec->nakend++ = 3; 1124 *dec->nakend++ = CALLBACK_CBCP; 1125 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164)) { 1126 *dec->nakend++ = *cp; 1127 *dec->nakend++ = 3; 1128 *dec->nakend++ = CALLBACK_E164; 1129 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) { 1130 log_Printf(LogWARN, "Cannot insist on auth callback without" 1131 " PAP or CHAP enabled !\n"); 1132 *dec->nakend++ = *cp; 1133 *dec->nakend++ = 2; 1134 } else 1135 goto reqreject; 1136 break; 1137 case MODE_NAK: 1138 /* We don't do what he NAKs with, we do things in our preferred order */ 1139 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) 1140 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_AUTH); 1141 else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) 1142 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_CBCP); 1143 else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164)) 1144 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_E164); 1145 if (lcp->want_callback.opmask == CALLBACK_BIT(CALLBACK_NONE)) { 1146 log_Printf(LogPHASE, "Peer NAKd all callbacks, trying none\n"); 1147 lcp->want_callback.opmask = 0; 1148 } else if (!lcp->want_callback.opmask) { 1149 log_Printf(LogPHASE, "Peer NAKd last configured callback\n"); 1150 fsm_Close(&lcp->fsm); 1151 } 1152 break; 1153 case MODE_REJ: 1154 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_NONE)) { 1155 lcp->his_reject |= (1 << type); 1156 lcp->want_callback.opmask = 0; 1157 } else { 1158 log_Printf(LogPHASE, "Peer rejected *required* callback\n"); 1159 fsm_Close(&lcp->fsm); 1160 } 1161 break; 1162 } 1163 break; 1164 1165 case TY_SHORTSEQ: 1166 mp = &lcp->fsm.bundle->ncp.mp; 1167 log_Printf(LogLCP, "%s\n", request); 1168 1169 switch (mode_type) { 1170 case MODE_REQ: 1171 if (lcp->want_mrru && IsAccepted(mp->cfg.shortseq)) { 1172 lcp->his_shortseq = 1; 1173 memcpy(dec->ackend, cp, length); 1174 dec->ackend += length; 1175 } else 1176 goto reqreject; 1177 break; 1178 case MODE_NAK: 1179 /* 1180 * He's trying to get us to ask for short sequence numbers. 1181 * We ignore the NAK and honour our configuration file instead. 1182 */ 1183 break; 1184 case MODE_REJ: 1185 lcp->his_reject |= (1 << type); 1186 lcp->want_shortseq = 0; /* For when we hit MP */ 1187 break; 1188 } 1189 break; 1190 1191 case TY_ENDDISC: 1192 mp = &lcp->fsm.bundle->ncp.mp; 1193 log_Printf(LogLCP, "%s %s\n", request, 1194 mp_Enddisc(cp[2], cp + 3, length - 3)); 1195 switch (mode_type) { 1196 case MODE_REQ: 1197 if (!p) { 1198 log_Printf(LogLCP, " ENDDISC rejected - not a physical link\n"); 1199 goto reqreject; 1200 } else if (!IsAccepted(mp->cfg.negenddisc)) 1201 goto reqreject; 1202 else if (length-3 < sizeof p->dl->peer.enddisc.address && 1203 cp[2] <= MAX_ENDDISC_CLASS) { 1204 p->dl->peer.enddisc.class = cp[2]; 1205 p->dl->peer.enddisc.len = length-3; 1206 memcpy(p->dl->peer.enddisc.address, cp + 3, length - 3); 1207 p->dl->peer.enddisc.address[length - 3] = '\0'; 1208 /* XXX: If mp->active, compare and NAK with mp->peer ? */ 1209 memcpy(dec->ackend, cp, length); 1210 dec->ackend += length; 1211 } else { 1212 if (cp[2] > MAX_ENDDISC_CLASS) 1213 log_Printf(LogLCP, " ENDDISC rejected - unrecognised class %d\n", 1214 cp[2]); 1215 else 1216 log_Printf(LogLCP, " ENDDISC rejected - local max length is %ld\n", 1217 (long)(sizeof p->dl->peer.enddisc.address - 1)); 1218 goto reqreject; 1219 } 1220 break; 1221 1222 case MODE_NAK: /* Treat this as a REJ, we don't vary our disc (yet) */ 1223 case MODE_REJ: 1224 lcp->his_reject |= (1 << type); 1225 break; 1226 } 1227 break; 1228 1229 default: 1230 sz = (sizeof desc - 2) / 2; 1231 if (sz > length - 2) 1232 sz = length - 2; 1233 pos = 0; 1234 desc[0] = sz ? ' ' : '\0'; 1235 for (pos = 0; sz--; pos++) 1236 sprintf(desc+(pos<<1)+1, "%02x", cp[pos+2]); 1237 1238 log_Printf(LogLCP, "%s%s\n", request, desc); 1239 1240 if (mode_type == MODE_REQ) { 1241 reqreject: 1242 if (length > sizeof dec->rej - (dec->rejend - dec->rej)) { 1243 length = sizeof dec->rej - (dec->rejend - dec->rej); 1244 log_Printf(LogLCP, "Can't REJ length %d - trunating to %d\n", 1245 cp[1], length); 1246 } 1247 memcpy(dec->rejend, cp, length); 1248 dec->rejend += length; 1249 lcp->my_reject |= (1 << type); 1250 if (length != cp[1]) 1251 length = 0; /* force our way out of the loop */ 1252 } 1253 break; 1254 } 1255 plen -= length; 1256 cp += length; 1257 } 1258 1259 if (mode_type != MODE_NOP) { 1260 if (mode_type == MODE_REQ && p && p->type == PHYS_DIRECT && 1261 p->dl->cfg.callback.opmask && !callback_req && 1262 !(p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_NONE))) { 1263 /* We *REQUIRE* that the peer requests callback */ 1264 *dec->nakend++ = TY_CALLBACK; 1265 *dec->nakend++ = 3; 1266 if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) && 1267 p->link.lcp.want_auth) 1268 *dec->nakend++ = CALLBACK_AUTH; 1269 else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) 1270 *dec->nakend++ = CALLBACK_CBCP; 1271 else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164)) 1272 *dec->nakend++ = CALLBACK_E164; 1273 else { 1274 log_Printf(LogWARN, "Cannot insist on auth callback without" 1275 " PAP or CHAP enabled !\n"); 1276 dec->nakend[-1] = 2; /* XXX: Silly ! */ 1277 } 1278 } 1279 if (mode_type == MODE_REQ && !lcp->mru_req) { 1280 mru = DEF_MRU; 1281 phmtu = p ? physical_DeviceMTU(p) : 0; 1282 if (phmtu && mru > phmtu) 1283 mru = phmtu; 1284 if (mru > lcp->cfg.max_mtu) 1285 mru = lcp->cfg.max_mtu; 1286 if (mru < DEF_MRU) { 1287 /* Don't let the peer use the default MRU */ 1288 lcp->his_mru = lcp->cfg.mtu && lcp->cfg.mtu < mru ? lcp->cfg.mtu : mru; 1289 *dec->nakend++ = TY_MRU; 1290 *dec->nakend++ = 4; 1291 ua_htons(&lcp->his_mru, dec->nakend); 1292 dec->nakend += 2; 1293 lcp->mru_req = 1; /* Don't keep NAK'ing this */ 1294 } 1295 } 1296 if (dec->rejend != dec->rej) { 1297 /* rejects are preferred */ 1298 dec->ackend = dec->ack; 1299 dec->nakend = dec->nak; 1300 } else if (dec->nakend != dec->nak) 1301 /* then NAKs */ 1302 dec->ackend = dec->ack; 1303 } 1304 } 1305 1306 extern struct mbuf * 1307 lcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1308 { 1309 /* Got PROTO_LCP from link */ 1310 m_settype(bp, MB_LCPIN); 1311 fsm_Input(&l->lcp.fsm, bp); 1312 return NULL; 1313 } 1314