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: src/usr.sbin/ppp/lcp.c,v 1.81.2.13 2002/09/01 02:12:28 brian Exp $ 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 <stdarg.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <termios.h> 44 #include <unistd.h> 45 46 #include "layer.h" 47 #include "ua.h" 48 #include "defs.h" 49 #include "command.h" 50 #include "mbuf.h" 51 #include "log.h" 52 #include "timer.h" 53 #include "fsm.h" 54 #include "iplist.h" 55 #include "throughput.h" 56 #include "proto.h" 57 #include "descriptor.h" 58 #include "lqr.h" 59 #include "hdlc.h" 60 #include "lcp.h" 61 #include "ccp.h" 62 #include "async.h" 63 #include "link.h" 64 #include "physical.h" 65 #include "prompt.h" 66 #include "slcompress.h" 67 #include "ncpaddr.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 struct fsm_opt_hdr hdr; 86 u_short proto; /* Quality protocol */ 87 u_int32_t period; /* Reporting interval */ 88 }; 89 90 static int LcpLayerUp(struct fsm *); 91 static void LcpLayerDown(struct fsm *); 92 static void LcpLayerStart(struct fsm *); 93 static void LcpLayerFinish(struct fsm *); 94 static void LcpInitRestartCounter(struct fsm *, int); 95 static void LcpSendConfigReq(struct fsm *); 96 static void LcpSentTerminateReq(struct fsm *); 97 static void LcpSendTerminateAck(struct fsm *, u_char); 98 static void LcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 99 struct fsm_decode *); 100 101 static struct fsm_callbacks lcp_Callbacks = { 102 LcpLayerUp, 103 LcpLayerDown, 104 LcpLayerStart, 105 LcpLayerFinish, 106 LcpInitRestartCounter, 107 LcpSendConfigReq, 108 LcpSentTerminateReq, 109 LcpSendTerminateAck, 110 LcpDecodeConfig, 111 fsm_NullRecvResetReq, 112 fsm_NullRecvResetAck 113 }; 114 115 static const char * const lcp_TimerNames[] = 116 {"LCP restart", "LCP openmode", "LCP stopped"}; 117 118 static const char * 119 protoname(unsigned proto) 120 { 121 static const char * const cftypes[] = { 122 /* Check out the latest ``Assigned numbers'' rfc (1700) */ 123 NULL, 124 "MRU", /* 1: Maximum-Receive-Unit */ 125 "ACCMAP", /* 2: Async-Control-Character-Map */ 126 "AUTHPROTO", /* 3: Authentication-Protocol */ 127 "QUALPROTO", /* 4: Quality-Protocol */ 128 "MAGICNUM", /* 5: Magic-Number */ 129 "RESERVED", /* 6: RESERVED */ 130 "PROTOCOMP", /* 7: Protocol-Field-Compression */ 131 "ACFCOMP", /* 8: Address-and-Control-Field-Compression */ 132 "FCSALT", /* 9: FCS-Alternatives */ 133 "SDP", /* 10: Self-Describing-Pad */ 134 "NUMMODE", /* 11: Numbered-Mode */ 135 "MULTIPROC", /* 12: Multi-Link-Procedure */ 136 "CALLBACK", /* 13: Callback */ 137 "CONTIME", /* 14: Connect-Time */ 138 "COMPFRAME", /* 15: Compound-Frames */ 139 "NDE", /* 16: Nominal-Data-Encapsulation */ 140 "MRRU", /* 17: Multilink-MRRU */ 141 "SHORTSEQ", /* 18: Multilink-Short-Sequence-Number-Header */ 142 "ENDDISC", /* 19: Multilink-Endpoint-Discriminator */ 143 "PROPRIETRY", /* 20: Proprietary */ 144 "DCEID", /* 21: DCE-Identifier */ 145 "MULTIPP", /* 22: Multi-Link-Plus-Procedure */ 146 "LDBACP", /* 23: Link Discriminator for BACP */ 147 }; 148 149 if (proto > NELEM(cftypes) || cftypes[proto] == NULL) 150 return HexStr(proto, NULL, 0); 151 152 return cftypes[proto]; 153 } 154 155 int 156 lcp_ReportStatus(struct cmdargs const *arg) 157 { 158 struct link *l; 159 struct lcp *lcp; 160 161 l = command_ChooseLink(arg); 162 lcp = &l->lcp; 163 164 prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, lcp->fsm.name, 165 State2Nam(lcp->fsm.state)); 166 prompt_Printf(arg->prompt, 167 " his side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n" 168 " MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n", 169 lcp->his_mru, (u_long)lcp->his_accmap, 170 lcp->his_protocomp ? "on" : "off", 171 lcp->his_acfcomp ? "on" : "off", 172 (u_long)lcp->his_magic, lcp->his_mrru, 173 lcp->his_shortseq ? "on" : "off", lcp->his_reject); 174 prompt_Printf(arg->prompt, 175 " my side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n" 176 " MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n", 177 lcp->want_mru, (u_long)lcp->want_accmap, 178 lcp->want_protocomp ? "on" : "off", 179 lcp->want_acfcomp ? "on" : "off", 180 (u_long)lcp->want_magic, lcp->want_mrru, 181 lcp->want_shortseq ? "on" : "off", lcp->my_reject); 182 183 if (lcp->cfg.mru) 184 prompt_Printf(arg->prompt, "\n Defaults: MRU = %d (max %d), ", 185 lcp->cfg.mru, lcp->cfg.max_mru); 186 else 187 prompt_Printf(arg->prompt, "\n Defaults: MRU = any (max %d), ", 188 lcp->cfg.max_mru); 189 if (lcp->cfg.mtu) 190 prompt_Printf(arg->prompt, "MTU = %d (max %d), ", 191 lcp->cfg.mtu, lcp->cfg.max_mtu); 192 else 193 prompt_Printf(arg->prompt, "MTU = any (max %d), ", lcp->cfg.max_mtu); 194 prompt_Printf(arg->prompt, "ACCMAP = %08lx\n", (u_long)lcp->cfg.accmap); 195 prompt_Printf(arg->prompt, " LQR period = %us, ", 196 lcp->cfg.lqrperiod); 197 prompt_Printf(arg->prompt, "Open Mode = %s", 198 lcp->cfg.openmode == OPEN_PASSIVE ? "passive" : "active"); 199 if (lcp->cfg.openmode > 0) 200 prompt_Printf(arg->prompt, " (delay %ds)", lcp->cfg.openmode); 201 prompt_Printf(arg->prompt, "\n FSM retry = %us, max %u Config" 202 " REQ%s, %u Term REQ%s\n", lcp->cfg.fsm.timeout, 203 lcp->cfg.fsm.maxreq, lcp->cfg.fsm.maxreq == 1 ? "" : "s", 204 lcp->cfg.fsm.maxtrm, lcp->cfg.fsm.maxtrm == 1 ? "" : "s"); 205 prompt_Printf(arg->prompt, " Ident: %s\n", lcp->cfg.ident); 206 prompt_Printf(arg->prompt, "\n Negotiation:\n"); 207 prompt_Printf(arg->prompt, " ACFCOMP = %s\n", 208 command_ShowNegval(lcp->cfg.acfcomp)); 209 prompt_Printf(arg->prompt, " CHAP = %s\n", 210 command_ShowNegval(lcp->cfg.chap05)); 211 #ifndef NODES 212 prompt_Printf(arg->prompt, " CHAP80 = %s\n", 213 command_ShowNegval(lcp->cfg.chap80nt)); 214 prompt_Printf(arg->prompt, " LANMan = %s\n", 215 command_ShowNegval(lcp->cfg.chap80lm)); 216 prompt_Printf(arg->prompt, " CHAP81 = %s\n", 217 command_ShowNegval(lcp->cfg.chap81)); 218 #endif 219 prompt_Printf(arg->prompt, " LQR = %s\n", 220 command_ShowNegval(lcp->cfg.lqr)); 221 prompt_Printf(arg->prompt, " PAP = %s\n", 222 command_ShowNegval(lcp->cfg.pap)); 223 prompt_Printf(arg->prompt, " PROTOCOMP = %s\n", 224 command_ShowNegval(lcp->cfg.protocomp)); 225 226 return 0; 227 } 228 229 static u_int32_t 230 GenerateMagic(void) 231 { 232 /* Generate random number which will be used as magic number */ 233 randinit(); 234 return random(); 235 } 236 237 void 238 lcp_SetupCallbacks(struct lcp *lcp) 239 { 240 lcp->fsm.fn = &lcp_Callbacks; 241 lcp->fsm.FsmTimer.name = lcp_TimerNames[0]; 242 lcp->fsm.OpenTimer.name = lcp_TimerNames[1]; 243 lcp->fsm.StoppedTimer.name = lcp_TimerNames[2]; 244 } 245 246 void 247 lcp_Init(struct lcp *lcp, struct bundle *bundle, struct link *l, 248 const struct fsm_parent *parent) 249 { 250 /* Initialise ourselves */ 251 int mincode = parent ? 1 : LCP_MINMPCODE; 252 253 fsm_Init(&lcp->fsm, "LCP", PROTO_LCP, mincode, LCP_MAXCODE, LogLCP, 254 bundle, l, parent, &lcp_Callbacks, lcp_TimerNames); 255 256 lcp->cfg.mru = 0; 257 lcp->cfg.max_mru = MAX_MRU; 258 lcp->cfg.mtu = 0; 259 lcp->cfg.max_mtu = MAX_MTU; 260 lcp->cfg.accmap = 0; 261 lcp->cfg.openmode = 1; 262 lcp->cfg.lqrperiod = DEF_LQRPERIOD; 263 lcp->cfg.fsm.timeout = DEF_FSMRETRY; 264 lcp->cfg.fsm.maxreq = DEF_FSMTRIES; 265 lcp->cfg.fsm.maxtrm = DEF_FSMTRIES; 266 267 lcp->cfg.acfcomp = NEG_ENABLED|NEG_ACCEPTED; 268 lcp->cfg.chap05 = NEG_ACCEPTED; 269 #ifndef NODES 270 lcp->cfg.chap80nt = NEG_ACCEPTED; 271 lcp->cfg.chap80lm = 0; 272 lcp->cfg.chap81 = NEG_ACCEPTED; 273 #endif 274 lcp->cfg.lqr = NEG_ACCEPTED; 275 lcp->cfg.pap = NEG_ACCEPTED; 276 lcp->cfg.protocomp = NEG_ENABLED|NEG_ACCEPTED; 277 *lcp->cfg.ident = '\0'; 278 279 lcp_Setup(lcp, lcp->cfg.openmode); 280 } 281 282 void 283 lcp_Setup(struct lcp *lcp, int openmode) 284 { 285 struct physical *p = link2physical(lcp->fsm.link); 286 287 lcp->fsm.open_mode = openmode; 288 289 lcp->his_mru = DEF_MRU; 290 lcp->his_mrru = 0; 291 lcp->his_magic = 0; 292 lcp->his_lqrperiod = 0; 293 lcp->his_acfcomp = 0; 294 lcp->his_auth = 0; 295 lcp->his_authtype = 0; 296 lcp->his_callback.opmask = 0; 297 lcp->his_shortseq = 0; 298 lcp->mru_req = 0; 299 300 if ((lcp->want_mru = lcp->cfg.mru) == 0) 301 lcp->want_mru = DEF_MRU; 302 lcp->want_mrru = lcp->fsm.bundle->ncp.mp.cfg.mrru; 303 lcp->want_shortseq = IsEnabled(lcp->fsm.bundle->ncp.mp.cfg.shortseq) ? 1 : 0; 304 lcp->want_acfcomp = IsEnabled(lcp->cfg.acfcomp) ? 1 : 0; 305 306 if (lcp->fsm.parent) { 307 lcp->his_accmap = 0xffffffff; 308 lcp->want_accmap = lcp->cfg.accmap; 309 lcp->his_protocomp = 0; 310 lcp->want_protocomp = IsEnabled(lcp->cfg.protocomp) ? 1 : 0; 311 lcp->want_magic = GenerateMagic(); 312 313 if (IsEnabled(lcp->cfg.chap05)) { 314 lcp->want_auth = PROTO_CHAP; 315 lcp->want_authtype = 0x05; 316 #ifndef NODES 317 } else if (IsEnabled(lcp->cfg.chap80nt) || 318 IsEnabled(lcp->cfg.chap80lm)) { 319 lcp->want_auth = PROTO_CHAP; 320 lcp->want_authtype = 0x80; 321 } else if (IsEnabled(lcp->cfg.chap81)) { 322 lcp->want_auth = PROTO_CHAP; 323 lcp->want_authtype = 0x81; 324 #endif 325 } else if (IsEnabled(lcp->cfg.pap)) { 326 lcp->want_auth = PROTO_PAP; 327 lcp->want_authtype = 0; 328 } else { 329 lcp->want_auth = 0; 330 lcp->want_authtype = 0; 331 } 332 333 if (p->type != PHYS_DIRECT) 334 memcpy(&lcp->want_callback, &p->dl->cfg.callback, 335 sizeof(struct callback)); 336 else 337 lcp->want_callback.opmask = 0; 338 lcp->want_lqrperiod = IsEnabled(lcp->cfg.lqr) ? 339 lcp->cfg.lqrperiod * 100 : 0; 340 } else { 341 lcp->his_accmap = lcp->want_accmap = 0; 342 lcp->his_protocomp = lcp->want_protocomp = 1; 343 lcp->want_magic = 0; 344 lcp->want_auth = 0; 345 lcp->want_authtype = 0; 346 lcp->want_callback.opmask = 0; 347 lcp->want_lqrperiod = 0; 348 } 349 350 lcp->his_reject = lcp->my_reject = 0; 351 lcp->auth_iwait = lcp->auth_ineed = 0; 352 lcp->LcpFailedMagic = 0; 353 } 354 355 static void 356 LcpInitRestartCounter(struct fsm *fp, int what) 357 { 358 /* Set fsm timer load */ 359 struct lcp *lcp = fsm2lcp(fp); 360 361 fp->FsmTimer.load = lcp->cfg.fsm.timeout * SECTICKS; 362 switch (what) { 363 case FSM_REQ_TIMER: 364 fp->restart = lcp->cfg.fsm.maxreq; 365 break; 366 case FSM_TRM_TIMER: 367 fp->restart = lcp->cfg.fsm.maxtrm; 368 break; 369 default: 370 fp->restart = 1; 371 break; 372 } 373 } 374 375 static void 376 LcpSendConfigReq(struct fsm *fp) 377 { 378 /* Send config REQ please */ 379 struct physical *p = link2physical(fp->link); 380 struct lcp *lcp = fsm2lcp(fp); 381 u_char buff[200]; 382 struct fsm_opt *o; 383 struct mp *mp; 384 u_int16_t proto; 385 u_short maxmru; 386 387 if (!p) { 388 log_Printf(LogERROR, "%s: LcpSendConfigReq: Not a physical link !\n", 389 fp->link->name); 390 return; 391 } 392 393 o = (struct fsm_opt *)buff; 394 if (!physical_IsSync(p)) { 395 if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP)) 396 INC_FSM_OPT(TY_ACFCOMP, 2, o); 397 398 if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP)) 399 INC_FSM_OPT(TY_PROTOCOMP, 2, o); 400 401 if (!REJECTED(lcp, TY_ACCMAP)) { 402 ua_htonl(&lcp->want_accmap, o->data); 403 INC_FSM_OPT(TY_ACCMAP, 6, o); 404 } 405 } 406 407 maxmru = p ? physical_DeviceMTU(p) : 0; 408 if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru)) 409 maxmru = lcp->cfg.max_mru; 410 if (maxmru && lcp->want_mru > maxmru) { 411 log_Printf(LogWARN, "%s: Reducing configured MRU from %u to %u\n", 412 fp->link->name, lcp->want_mru, maxmru); 413 lcp->want_mru = maxmru; 414 } 415 if (!REJECTED(lcp, TY_MRU)) { 416 ua_htons(&lcp->want_mru, o->data); 417 INC_FSM_OPT(TY_MRU, 4, o); 418 } 419 420 if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM)) { 421 ua_htonl(&lcp->want_magic, o->data); 422 INC_FSM_OPT(TY_MAGICNUM, 6, o); 423 } 424 425 if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO)) { 426 proto = PROTO_LQR; 427 ua_htons(&proto, o->data); 428 ua_htonl(&lcp->want_lqrperiod, o->data + 2); 429 INC_FSM_OPT(TY_QUALPROTO, 8, o); 430 } 431 432 switch (lcp->want_auth) { 433 case PROTO_PAP: 434 proto = PROTO_PAP; 435 ua_htons(&proto, o->data); 436 INC_FSM_OPT(TY_AUTHPROTO, 4, o); 437 break; 438 439 case PROTO_CHAP: 440 proto = PROTO_CHAP; 441 ua_htons(&proto, o->data); 442 o->data[2] = lcp->want_authtype; 443 INC_FSM_OPT(TY_AUTHPROTO, 5, o); 444 break; 445 } 446 447 if (!REJECTED(lcp, TY_CALLBACK)) { 448 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) { 449 *o->data = CALLBACK_AUTH; 450 INC_FSM_OPT(TY_CALLBACK, 3, o); 451 } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) { 452 *o->data = CALLBACK_CBCP; 453 INC_FSM_OPT(TY_CALLBACK, 3, o); 454 } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164)) { 455 size_t sz = strlen(lcp->want_callback.msg); 456 457 if (sz > sizeof o->data - 1) { 458 sz = sizeof o->data - 1; 459 log_Printf(LogWARN, "Truncating E164 data to %zu octets (oops!)\n", sz); 460 } 461 *o->data = CALLBACK_E164; 462 memcpy(o->data + 1, lcp->want_callback.msg, sz); 463 INC_FSM_OPT(TY_CALLBACK, sz + 3, o); 464 } 465 } 466 467 if (lcp->want_mrru && !REJECTED(lcp, TY_MRRU)) { 468 ua_htons(&lcp->want_mrru, o->data); 469 INC_FSM_OPT(TY_MRRU, 4, o); 470 471 if (lcp->want_shortseq && !REJECTED(lcp, TY_SHORTSEQ)) 472 INC_FSM_OPT(TY_SHORTSEQ, 2, o); 473 } 474 475 mp = &lcp->fsm.bundle->ncp.mp; 476 if (mp->cfg.enddisc.class != 0 && IsEnabled(mp->cfg.negenddisc) && 477 !REJECTED(lcp, TY_ENDDISC)) { 478 *o->data = mp->cfg.enddisc.class; 479 memcpy(o->data+1, mp->cfg.enddisc.address, mp->cfg.enddisc.len); 480 INC_FSM_OPT(TY_ENDDISC, mp->cfg.enddisc.len + 3, o); 481 } 482 483 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 484 MB_LCPOUT); 485 } 486 487 void 488 lcp_SendProtoRej(struct lcp *lcp, u_char *option, int count) 489 { 490 /* Don't understand `option' */ 491 fsm_Output(&lcp->fsm, CODE_PROTOREJ, lcp->fsm.reqid, option, count, 492 MB_LCPOUT); 493 } 494 495 int 496 lcp_SendIdentification(struct lcp *lcp) 497 { 498 static u_char id; /* Use a private id */ 499 u_char msg[DEF_MRU - 3]; 500 const char *argv[2]; 501 char *exp[2]; 502 503 if (*lcp->cfg.ident == '\0') 504 return 0; 505 506 argv[0] = lcp->cfg.ident; 507 argv[1] = NULL; 508 509 command_Expand(exp, 1, argv, lcp->fsm.bundle, 1, getpid()); 510 511 ua_htonl(&lcp->want_magic, msg); 512 strncpy(msg + 4, exp[0], sizeof msg - 5); 513 msg[sizeof msg - 1] = '\0'; 514 515 fsm_Output(&lcp->fsm, CODE_IDENT, id++, msg, 4 + strlen(msg + 4), MB_LCPOUT); 516 log_Printf(LogLCP, " MAGICNUM %08x\n", lcp->want_magic); 517 log_Printf(LogLCP, " TEXT %s\n", msg + 4); 518 519 command_Free(1, exp); 520 return 1; 521 } 522 523 void 524 lcp_RecvIdentification(struct lcp *lcp, char *data) 525 { 526 log_Printf(LogLCP, " MAGICNUM %08x\n", lcp->his_magic); 527 log_Printf(LogLCP, " TEXT %s\n", data); 528 } 529 530 static void 531 LcpSentTerminateReq(struct fsm *fp __unused) 532 { 533 /* Term REQ just sent by FSM */ 534 } 535 536 static void 537 LcpSendTerminateAck(struct fsm *fp, u_char id) 538 { 539 /* Send Term ACK please */ 540 struct physical *p = link2physical(fp->link); 541 542 if (p && p->dl->state == DATALINK_CBCP) 543 cbcp_ReceiveTerminateReq(p); 544 545 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_LCPOUT); 546 } 547 548 static void 549 LcpLayerStart(struct fsm *fp) 550 { 551 /* We're about to start up ! */ 552 struct lcp *lcp = fsm2lcp(fp); 553 554 log_Printf(LogLCP, "%s: LayerStart\n", fp->link->name); 555 lcp->LcpFailedMagic = 0; 556 fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3; 557 lcp->mru_req = 0; 558 } 559 560 static void 561 LcpLayerFinish(struct fsm *fp) 562 { 563 /* We're now down */ 564 log_Printf(LogLCP, "%s: LayerFinish\n", fp->link->name); 565 } 566 567 static int 568 LcpLayerUp(struct fsm *fp) 569 { 570 /* We're now up */ 571 struct physical *p = link2physical(fp->link); 572 struct lcp *lcp = fsm2lcp(fp); 573 574 log_Printf(LogLCP, "%s: LayerUp\n", fp->link->name); 575 physical_SetAsyncParams(p, lcp->want_accmap, lcp->his_accmap); 576 lqr_Start(lcp); 577 hdlc_StartTimer(&p->hdlc); 578 fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3; 579 580 lcp_SendIdentification(lcp); 581 582 return 1; 583 } 584 585 static void 586 LcpLayerDown(struct fsm *fp) 587 { 588 /* About to come down */ 589 struct physical *p = link2physical(fp->link); 590 591 log_Printf(LogLCP, "%s: LayerDown\n", fp->link->name); 592 hdlc_StopTimer(&p->hdlc); 593 lqr_StopTimer(p); 594 lcp_Setup(fsm2lcp(fp), 0); 595 } 596 597 static int 598 E164ok(struct callback *cb, char *req, int sz) 599 { 600 char list[sizeof cb->msg], *next; 601 int len; 602 603 if (!strcmp(cb->msg, "*")) 604 return 1; 605 606 strncpy(list, cb->msg, sizeof list - 1); 607 list[sizeof list - 1] = '\0'; 608 for (next = strtok(list, ","); next; next = strtok(NULL, ",")) { 609 len = strlen(next); 610 if (sz == len && !memcmp(list, req, sz)) 611 return 1; 612 } 613 return 0; 614 } 615 616 static int 617 lcp_auth_nak(struct lcp *lcp, struct fsm_decode *dec) 618 { 619 struct fsm_opt nak; 620 621 nak.hdr.id = TY_AUTHPROTO; 622 623 if (IsAccepted(lcp->cfg.pap)) { 624 nak.hdr.len = 4; 625 nak.data[0] = (unsigned char)(PROTO_PAP >> 8); 626 nak.data[1] = (unsigned char)PROTO_PAP; 627 fsm_nak(dec, &nak); 628 return 1; 629 } 630 631 nak.hdr.len = 5; 632 nak.data[0] = (unsigned char)(PROTO_CHAP >> 8); 633 nak.data[1] = (unsigned char)PROTO_CHAP; 634 635 if (IsAccepted(lcp->cfg.chap05)) { 636 nak.data[2] = 0x05; 637 fsm_nak(dec, &nak); 638 #ifndef NODES 639 } else if (IsAccepted(lcp->cfg.chap80nt) || 640 IsAccepted(lcp->cfg.chap80lm)) { 641 nak.data[2] = 0x80; 642 fsm_nak(dec, &nak); 643 } else if (IsAccepted(lcp->cfg.chap81)) { 644 nak.data[2] = 0x81; 645 fsm_nak(dec, &nak); 646 #endif 647 } else { 648 return 0; 649 } 650 651 return 1; 652 } 653 654 static void 655 LcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 656 struct fsm_decode *dec) 657 { 658 /* Deal with incoming PROTO_LCP */ 659 struct lcp *lcp = fsm2lcp(fp); 660 int pos, op, callback_req, chap_type; 661 size_t sz; 662 u_int32_t magic, accmap; 663 u_short mru, phmtu, maxmtu, maxmru, wantmtu, wantmru, proto; 664 struct lqrreq *req; 665 char request[20], desc[22]; 666 struct mp *mp; 667 struct physical *p = link2physical(fp->link); 668 struct fsm_opt *opt, nak; 669 670 sz = 0; 671 op = callback_req = 0; 672 673 while (end - cp >= (int)sizeof(opt->hdr)) { 674 if ((opt = fsm_readopt(&cp)) == NULL) 675 break; 676 677 snprintf(request, sizeof request, " %s[%d]", protoname(opt->hdr.id), 678 opt->hdr.len); 679 680 switch (opt->hdr.id) { 681 case TY_MRRU: 682 mp = &lcp->fsm.bundle->ncp.mp; 683 ua_ntohs(opt->data, &mru); 684 log_Printf(LogLCP, "%s %u\n", request, mru); 685 686 switch (mode_type) { 687 case MODE_REQ: 688 if (mp->cfg.mrru) { 689 if (REJECTED(lcp, TY_MRRU)) 690 /* Ignore his previous reject so that we REQ next time */ 691 lcp->his_reject &= ~(1 << opt->hdr.id); 692 693 if (mru > MAX_MRU) { 694 /* Push him down to MAX_MRU */ 695 lcp->his_mrru = MAX_MRU; 696 nak.hdr.id = TY_MRRU; 697 nak.hdr.len = 4; 698 ua_htons(&lcp->his_mrru, nak.data); 699 fsm_nak(dec, &nak); 700 } else if (mru < MIN_MRU) { 701 /* Push him up to MIN_MRU */ 702 lcp->his_mrru = MIN_MRU; 703 nak.hdr.id = TY_MRRU; 704 nak.hdr.len = 4; 705 ua_htons(&lcp->his_mrru, nak.data); 706 fsm_nak(dec, &nak); 707 } else { 708 lcp->his_mrru = mru; 709 fsm_ack(dec, opt); 710 } 711 break; 712 } else { 713 fsm_rej(dec, opt); 714 lcp->my_reject |= (1 << opt->hdr.id); 715 } 716 break; 717 case MODE_NAK: 718 if (mp->cfg.mrru) { 719 if (REJECTED(lcp, TY_MRRU)) 720 /* Must have changed his mind ! */ 721 lcp->his_reject &= ~(1 << opt->hdr.id); 722 723 if (mru > MAX_MRU) 724 lcp->want_mrru = MAX_MRU; 725 else if (mru < MIN_MRU) 726 lcp->want_mrru = MIN_MRU; 727 else 728 lcp->want_mrru = mru; 729 } 730 /* else we honour our config and don't send the suggested REQ */ 731 break; 732 case MODE_REJ: 733 lcp->his_reject |= (1 << opt->hdr.id); 734 lcp->want_mrru = 0; /* Ah well, no multilink :-( */ 735 break; 736 } 737 break; 738 739 case TY_MRU: 740 lcp->mru_req = 1; 741 ua_ntohs(opt->data, &mru); 742 log_Printf(LogLCP, "%s %d\n", request, mru); 743 744 switch (mode_type) { 745 case MODE_REQ: 746 maxmtu = p ? physical_DeviceMTU(p) : 0; 747 if (lcp->cfg.max_mtu && (!maxmtu || maxmtu > lcp->cfg.max_mtu)) 748 maxmtu = lcp->cfg.max_mtu; 749 wantmtu = lcp->cfg.mtu; 750 if (maxmtu && wantmtu > maxmtu) { 751 log_Printf(LogWARN, "%s: Reducing configured MTU from %u to %u\n", 752 fp->link->name, wantmtu, maxmtu); 753 wantmtu = maxmtu; 754 } 755 756 if (maxmtu && mru > maxmtu) { 757 lcp->his_mru = maxmtu; 758 nak.hdr.id = TY_MRU; 759 nak.hdr.len = 4; 760 ua_htons(&lcp->his_mru, nak.data); 761 fsm_nak(dec, &nak); 762 } else if (wantmtu && mru < wantmtu) { 763 /* Push him up to MTU or MIN_MRU */ 764 lcp->his_mru = wantmtu; 765 nak.hdr.id = TY_MRU; 766 nak.hdr.len = 4; 767 ua_htons(&lcp->his_mru, nak.data); 768 fsm_nak(dec, &nak); 769 } else { 770 lcp->his_mru = mru; 771 fsm_ack(dec, opt); 772 } 773 break; 774 case MODE_NAK: 775 maxmru = p ? physical_DeviceMTU(p) : 0; 776 if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru)) 777 maxmru = lcp->cfg.max_mru; 778 wantmru = lcp->cfg.mru > maxmru ? maxmru : lcp->cfg.mru; 779 780 if (wantmru && mru > wantmru) 781 lcp->want_mru = wantmru; 782 else if (mru > maxmru) 783 lcp->want_mru = maxmru; 784 else if (mru < MIN_MRU) 785 lcp->want_mru = MIN_MRU; 786 else 787 lcp->want_mru = mru; 788 break; 789 case MODE_REJ: 790 lcp->his_reject |= (1 << opt->hdr.id); 791 break; 792 } 793 break; 794 795 case TY_ACCMAP: 796 ua_ntohl(opt->data, &accmap); 797 log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)accmap); 798 799 switch (mode_type) { 800 case MODE_REQ: 801 lcp->his_accmap = accmap; 802 fsm_ack(dec, opt); 803 break; 804 case MODE_NAK: 805 lcp->want_accmap = accmap; 806 break; 807 case MODE_REJ: 808 lcp->his_reject |= (1 << opt->hdr.id); 809 break; 810 } 811 break; 812 813 case TY_AUTHPROTO: 814 ua_ntohs(opt->data, &proto); 815 chap_type = opt->hdr.len == 5 ? opt->data[2] : 0; 816 817 log_Printf(LogLCP, "%s 0x%04x (%s)\n", request, proto, 818 Auth2Nam(proto, chap_type)); 819 820 switch (mode_type) { 821 case MODE_REQ: 822 switch (proto) { 823 case PROTO_PAP: 824 if (opt->hdr.len == 4 && IsAccepted(lcp->cfg.pap)) { 825 lcp->his_auth = proto; 826 lcp->his_authtype = 0; 827 fsm_ack(dec, opt); 828 } else if (!lcp_auth_nak(lcp, dec)) { 829 lcp->my_reject |= (1 << opt->hdr.id); 830 fsm_rej(dec, opt); 831 } 832 break; 833 834 case PROTO_CHAP: 835 if ((chap_type == 0x05 && IsAccepted(lcp->cfg.chap05)) 836 #ifndef NODES 837 || (chap_type == 0x80 && (IsAccepted(lcp->cfg.chap80nt) || 838 (IsAccepted(lcp->cfg.chap80lm)))) 839 || (chap_type == 0x81 && IsAccepted(lcp->cfg.chap81)) 840 #endif 841 ) { 842 lcp->his_auth = proto; 843 lcp->his_authtype = chap_type; 844 fsm_ack(dec, opt); 845 } else { 846 #ifdef NODES 847 if (chap_type == 0x80) { 848 log_Printf(LogWARN, "CHAP 0x80 not available without DES\n"); 849 } else if (chap_type == 0x81) { 850 log_Printf(LogWARN, "CHAP 0x81 not available without DES\n"); 851 } else 852 #endif 853 if (chap_type != 0x05) 854 log_Printf(LogWARN, "%s not supported\n", 855 Auth2Nam(PROTO_CHAP, chap_type)); 856 857 if (!lcp_auth_nak(lcp, dec)) { 858 lcp->my_reject |= (1 << opt->hdr.id); 859 fsm_rej(dec, opt); 860 } 861 } 862 break; 863 864 default: 865 log_Printf(LogLCP, "%s 0x%04x - not recognised\n", 866 request, proto); 867 if (!lcp_auth_nak(lcp, dec)) { 868 lcp->my_reject |= (1 << opt->hdr.id); 869 fsm_rej(dec, opt); 870 } 871 break; 872 } 873 break; 874 875 case MODE_NAK: 876 switch (proto) { 877 case PROTO_PAP: 878 if (IsEnabled(lcp->cfg.pap)) { 879 lcp->want_auth = PROTO_PAP; 880 lcp->want_authtype = 0; 881 } else { 882 log_Printf(LogLCP, "Peer will only send PAP (not enabled)\n"); 883 lcp->his_reject |= (1 << opt->hdr.id); 884 } 885 break; 886 case PROTO_CHAP: 887 if (chap_type == 0x05 && IsEnabled(lcp->cfg.chap05)) { 888 lcp->want_auth = PROTO_CHAP; 889 lcp->want_authtype = 0x05; 890 #ifndef NODES 891 } else if (chap_type == 0x80 && (IsEnabled(lcp->cfg.chap80nt) || 892 IsEnabled(lcp->cfg.chap80lm))) { 893 lcp->want_auth = PROTO_CHAP; 894 lcp->want_authtype = 0x80; 895 } else if (chap_type == 0x81 && IsEnabled(lcp->cfg.chap81)) { 896 lcp->want_auth = PROTO_CHAP; 897 lcp->want_authtype = 0x81; 898 #endif 899 } else { 900 #ifdef NODES 901 if (chap_type == 0x80) { 902 log_Printf(LogLCP, "Peer will only send MSCHAP (not available" 903 " without DES)\n"); 904 } else if (chap_type == 0x81) { 905 log_Printf(LogLCP, "Peer will only send MSCHAPV2 (not available" 906 " without DES)\n"); 907 } else 908 #endif 909 log_Printf(LogLCP, "Peer will only send %s (not %s)\n", 910 Auth2Nam(PROTO_CHAP, chap_type), 911 #ifndef NODES 912 (chap_type == 0x80 || chap_type == 0x81) ? "configured" : 913 #endif 914 "supported"); 915 lcp->his_reject |= (1 << opt->hdr.id); 916 } 917 break; 918 default: 919 /* We've been NAK'd with something we don't understand :-( */ 920 lcp->his_reject |= (1 << opt->hdr.id); 921 break; 922 } 923 break; 924 925 case MODE_REJ: 926 lcp->his_reject |= (1 << opt->hdr.id); 927 break; 928 } 929 break; 930 931 case TY_QUALPROTO: 932 req = (struct lqrreq *)opt; 933 log_Printf(LogLCP, "%s proto %x, interval %lums\n", 934 request, ntohs(req->proto), (u_long)ntohl(req->period) * 10); 935 switch (mode_type) { 936 case MODE_REQ: 937 if (ntohs(req->proto) != PROTO_LQR || !IsAccepted(lcp->cfg.lqr)) { 938 fsm_rej(dec, opt); 939 lcp->my_reject |= (1 << opt->hdr.id); 940 } else { 941 lcp->his_lqrperiod = ntohl(req->period); 942 if (lcp->his_lqrperiod < MIN_LQRPERIOD * 100) 943 lcp->his_lqrperiod = MIN_LQRPERIOD * 100; 944 req->period = htonl(lcp->his_lqrperiod); 945 fsm_ack(dec, opt); 946 } 947 break; 948 case MODE_NAK: 949 lcp->want_lqrperiod = ntohl(req->period); 950 break; 951 case MODE_REJ: 952 lcp->his_reject |= (1 << opt->hdr.id); 953 break; 954 } 955 break; 956 957 case TY_MAGICNUM: 958 ua_ntohl(opt->data, &magic); 959 log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)magic); 960 961 switch (mode_type) { 962 case MODE_REQ: 963 if (lcp->want_magic) { 964 /* Validate magic number */ 965 if (magic == lcp->want_magic) { 966 sigset_t emptyset; 967 968 log_Printf(LogLCP, "Magic is same (%08lx) - %d times\n", 969 (u_long)magic, ++lcp->LcpFailedMagic); 970 lcp->want_magic = GenerateMagic(); 971 fsm_nak(dec, opt); 972 ualarm(TICKUNIT * (4 + 4 * lcp->LcpFailedMagic), 0); 973 sigemptyset(&emptyset); 974 sigsuspend(&emptyset); 975 } else { 976 lcp->his_magic = magic; 977 lcp->LcpFailedMagic = 0; 978 fsm_ack(dec, opt); 979 } 980 } else { 981 lcp->my_reject |= (1 << opt->hdr.id); 982 fsm_rej(dec, opt); 983 } 984 break; 985 case MODE_NAK: 986 log_Printf(LogLCP, " Magic 0x%08lx is NAKed!\n", (u_long)magic); 987 lcp->want_magic = GenerateMagic(); 988 break; 989 case MODE_REJ: 990 log_Printf(LogLCP, " Magic 0x%08x is REJected!\n", magic); 991 lcp->want_magic = 0; 992 lcp->his_reject |= (1 << opt->hdr.id); 993 break; 994 } 995 break; 996 997 case TY_PROTOCOMP: 998 log_Printf(LogLCP, "%s\n", request); 999 1000 switch (mode_type) { 1001 case MODE_REQ: 1002 if (IsAccepted(lcp->cfg.protocomp)) { 1003 lcp->his_protocomp = 1; 1004 fsm_ack(dec, opt); 1005 } else { 1006 #ifdef OLDMST 1007 /* MorningStar before v1.3 needs NAK */ 1008 fsm_nak(dec, opt); 1009 #else 1010 fsm_rej(dec, opt); 1011 lcp->my_reject |= (1 << opt->hdr.id); 1012 #endif 1013 } 1014 break; 1015 case MODE_NAK: 1016 case MODE_REJ: 1017 lcp->want_protocomp = 0; 1018 lcp->his_reject |= (1 << opt->hdr.id); 1019 break; 1020 } 1021 break; 1022 1023 case TY_ACFCOMP: 1024 log_Printf(LogLCP, "%s\n", request); 1025 switch (mode_type) { 1026 case MODE_REQ: 1027 if (IsAccepted(lcp->cfg.acfcomp)) { 1028 lcp->his_acfcomp = 1; 1029 fsm_ack(dec, opt); 1030 } else { 1031 #ifdef OLDMST 1032 /* MorningStar before v1.3 needs NAK */ 1033 fsm_nak(dec, opt); 1034 #else 1035 fsm_rej(dec, opt); 1036 lcp->my_reject |= (1 << opt->hdr.id); 1037 #endif 1038 } 1039 break; 1040 case MODE_NAK: 1041 case MODE_REJ: 1042 lcp->want_acfcomp = 0; 1043 lcp->his_reject |= (1 << opt->hdr.id); 1044 break; 1045 } 1046 break; 1047 1048 case TY_SDP: 1049 log_Printf(LogLCP, "%s\n", request); 1050 switch (mode_type) { 1051 case MODE_REQ: 1052 case MODE_NAK: 1053 case MODE_REJ: 1054 break; 1055 } 1056 break; 1057 1058 case TY_CALLBACK: 1059 if (opt->hdr.len == 2) { 1060 op = CALLBACK_NONE; 1061 sz = 0; 1062 } else { 1063 op = (int)opt->data[0]; 1064 sz = opt->hdr.len - 3; 1065 } 1066 switch (op) { 1067 case CALLBACK_AUTH: 1068 log_Printf(LogLCP, "%s Auth\n", request); 1069 break; 1070 case CALLBACK_DIALSTRING: 1071 log_Printf(LogLCP, "%s Dialstring %.*s\n", request, (int)sz, 1072 opt->data + 1); 1073 break; 1074 case CALLBACK_LOCATION: 1075 log_Printf(LogLCP, "%s Location %.*s\n", request, (int)sz, opt->data + 1); 1076 break; 1077 case CALLBACK_E164: 1078 log_Printf(LogLCP, "%s E.164 (%.*s)\n", request, (int)sz, opt->data + 1); 1079 break; 1080 case CALLBACK_NAME: 1081 log_Printf(LogLCP, "%s Name %.*s\n", request, (int)sz, opt->data + 1); 1082 break; 1083 case CALLBACK_CBCP: 1084 log_Printf(LogLCP, "%s CBCP\n", request); 1085 break; 1086 default: 1087 log_Printf(LogLCP, "%s ???\n", request); 1088 break; 1089 } 1090 1091 switch (mode_type) { 1092 case MODE_REQ: 1093 callback_req = 1; 1094 if (p->type != PHYS_DIRECT) { 1095 fsm_rej(dec, opt); 1096 lcp->my_reject |= (1 << opt->hdr.id); 1097 } 1098 nak.hdr.id = opt->hdr.id; 1099 nak.hdr.len = 3; 1100 if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(op)) && 1101 (op != CALLBACK_AUTH || p->link.lcp.want_auth) && 1102 (op != CALLBACK_E164 || 1103 E164ok(&p->dl->cfg.callback, opt->data + 1, sz))) { 1104 lcp->his_callback.opmask = CALLBACK_BIT(op); 1105 if (sz > sizeof lcp->his_callback.msg - 1) { 1106 sz = sizeof lcp->his_callback.msg - 1; 1107 log_Printf(LogWARN, "Truncating option arg to %zu octets\n", sz); 1108 } 1109 memcpy(lcp->his_callback.msg, opt->data + 1, sz); 1110 lcp->his_callback.msg[sz] = '\0'; 1111 fsm_ack(dec, opt); 1112 } else if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) && 1113 p->link.lcp.auth_ineed) { 1114 nak.data[0] = CALLBACK_AUTH; 1115 fsm_nak(dec, &nak); 1116 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) { 1117 nak.data[0] = CALLBACK_CBCP; 1118 fsm_nak(dec, &nak); 1119 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164)) { 1120 nak.data[0] = CALLBACK_E164; 1121 fsm_nak(dec, &nak); 1122 } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) { 1123 log_Printf(LogWARN, "Cannot insist on auth callback without" 1124 " PAP or CHAP enabled !\n"); 1125 nak.data[0] = 2; 1126 fsm_nak(dec, &nak); 1127 } else { 1128 lcp->my_reject |= (1 << opt->hdr.id); 1129 fsm_rej(dec, opt); 1130 } 1131 break; 1132 case MODE_NAK: 1133 /* We don't do what he NAKs with, we do things in our preferred order */ 1134 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) 1135 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_AUTH); 1136 else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) 1137 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_CBCP); 1138 else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164)) 1139 lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_E164); 1140 if (lcp->want_callback.opmask == CALLBACK_BIT(CALLBACK_NONE)) { 1141 log_Printf(LogPHASE, "Peer NAKd all callbacks, trying none\n"); 1142 lcp->want_callback.opmask = 0; 1143 } else if (!lcp->want_callback.opmask) { 1144 log_Printf(LogPHASE, "Peer NAKd last configured callback\n"); 1145 fsm_Close(&lcp->fsm); 1146 } 1147 break; 1148 case MODE_REJ: 1149 if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_NONE)) { 1150 lcp->his_reject |= (1 << opt->hdr.id); 1151 lcp->want_callback.opmask = 0; 1152 } else { 1153 log_Printf(LogPHASE, "Peer rejected *required* callback\n"); 1154 fsm_Close(&lcp->fsm); 1155 } 1156 break; 1157 } 1158 break; 1159 1160 case TY_SHORTSEQ: 1161 mp = &lcp->fsm.bundle->ncp.mp; 1162 log_Printf(LogLCP, "%s\n", request); 1163 1164 switch (mode_type) { 1165 case MODE_REQ: 1166 if (lcp->want_mrru && IsAccepted(mp->cfg.shortseq)) { 1167 lcp->his_shortseq = 1; 1168 fsm_ack(dec, opt); 1169 } else { 1170 fsm_rej(dec, opt); 1171 lcp->my_reject |= (1 << opt->hdr.id); 1172 } 1173 break; 1174 case MODE_NAK: 1175 /* 1176 * He's trying to get us to ask for short sequence numbers. 1177 * We ignore the NAK and honour our configuration file instead. 1178 */ 1179 break; 1180 case MODE_REJ: 1181 lcp->his_reject |= (1 << opt->hdr.id); 1182 lcp->want_shortseq = 0; /* For when we hit MP */ 1183 break; 1184 } 1185 break; 1186 1187 case TY_ENDDISC: 1188 mp = &lcp->fsm.bundle->ncp.mp; 1189 log_Printf(LogLCP, "%s %s\n", request, 1190 mp_Enddisc(opt->data[0], opt->data + 1, opt->hdr.len - 3)); 1191 switch (mode_type) { 1192 case MODE_REQ: 1193 if (!p) { 1194 log_Printf(LogLCP, " ENDDISC rejected - not a physical link\n"); 1195 fsm_rej(dec, opt); 1196 lcp->my_reject |= (1 << opt->hdr.id); 1197 } else if (!IsAccepted(mp->cfg.negenddisc)) { 1198 lcp->my_reject |= (1 << opt->hdr.id); 1199 fsm_rej(dec, opt); 1200 } else if (opt->hdr.len < sizeof p->dl->peer.enddisc.address + 3 && 1201 opt->data[0] <= MAX_ENDDISC_CLASS) { 1202 p->dl->peer.enddisc.class = opt->data[0]; 1203 p->dl->peer.enddisc.len = opt->hdr.len - 3; 1204 memcpy(p->dl->peer.enddisc.address, opt->data + 1, opt->hdr.len - 3); 1205 p->dl->peer.enddisc.address[opt->hdr.len - 3] = '\0'; 1206 /* XXX: If mp->active, compare and NAK with mp->peer ? */ 1207 fsm_ack(dec, opt); 1208 } else { 1209 if (opt->data[0] > MAX_ENDDISC_CLASS) 1210 log_Printf(LogLCP, " ENDDISC rejected - unrecognised class %d\n", 1211 opt->data[0]); 1212 else 1213 log_Printf(LogLCP, " ENDDISC rejected - local max length is %ld\n", 1214 (long)(sizeof p->dl->peer.enddisc.address - 1)); 1215 fsm_rej(dec, opt); 1216 lcp->my_reject |= (1 << opt->hdr.id); 1217 } 1218 break; 1219 1220 case MODE_NAK: /* Treat this as a REJ, we don't vary our disc (yet) */ 1221 case MODE_REJ: 1222 lcp->his_reject |= (1 << opt->hdr.id); 1223 break; 1224 } 1225 break; 1226 1227 default: 1228 sz = (sizeof desc - 2) / 2; 1229 if (sz + 2 > opt->hdr.len) 1230 sz = opt->hdr.len - 2; 1231 pos = 0; 1232 desc[0] = sz ? ' ' : '\0'; 1233 for (pos = 0; sz--; pos++) 1234 sprintf(desc+(pos<<1)+1, "%02x", opt->data[pos]); 1235 1236 log_Printf(LogLCP, "%s%s\n", request, desc); 1237 1238 if (mode_type == MODE_REQ) { 1239 fsm_rej(dec, opt); 1240 lcp->my_reject |= (1 << opt->hdr.id); 1241 } 1242 break; 1243 } 1244 } 1245 1246 if (mode_type != MODE_NOP) { 1247 if (mode_type == MODE_REQ && p && p->type == PHYS_DIRECT && 1248 p->dl->cfg.callback.opmask && !callback_req && 1249 !(p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_NONE))) { 1250 /* We *REQUIRE* that the peer requests callback */ 1251 nak.hdr.id = TY_CALLBACK; 1252 nak.hdr.len = 3; 1253 if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) && 1254 p->link.lcp.want_auth) 1255 nak.data[0] = CALLBACK_AUTH; 1256 else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) 1257 nak.data[0] = CALLBACK_CBCP; 1258 else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164)) 1259 nak.data[0] = CALLBACK_E164; 1260 else { 1261 log_Printf(LogWARN, "Cannot insist on auth callback without" 1262 " PAP or CHAP enabled !\n"); 1263 nak.hdr.len = 2; /* XXX: Silly ! */ 1264 } 1265 fsm_nak(dec, &nak); 1266 } 1267 if (mode_type == MODE_REQ && !lcp->mru_req) { 1268 mru = DEF_MRU; 1269 phmtu = p ? physical_DeviceMTU(p) : 0; 1270 if (phmtu && mru > phmtu) 1271 mru = phmtu; 1272 if (mru > lcp->cfg.max_mtu) 1273 mru = lcp->cfg.max_mtu; 1274 if (mru < DEF_MRU) { 1275 /* Don't let the peer use the default MRU */ 1276 lcp->his_mru = lcp->cfg.mtu && lcp->cfg.mtu < mru ? lcp->cfg.mtu : mru; 1277 nak.hdr.id = TY_MRU; 1278 nak.hdr.len = 4; 1279 ua_htons(&lcp->his_mru, nak.data); 1280 fsm_nak(dec, &nak); 1281 lcp->mru_req = 1; /* Don't keep NAK'ing this */ 1282 } 1283 } 1284 fsm_opt_normalise(dec); 1285 } 1286 } 1287 1288 extern struct mbuf * 1289 lcp_Input(struct bundle *bundle __unused, struct link *l, struct mbuf *bp) 1290 { 1291 /* Got PROTO_LCP from link */ 1292 m_settype(bp, MB_LCPIN); 1293 fsm_Input(&l->lcp.fsm, bp); 1294 return NULL; 1295 } 1296