fsm.c revision 32381
1/* 2 * PPP Finite State Machine for LCP/IPCP 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: fsm.c,v 1.25 1997/12/24 09:28:58 brian Exp $ 21 * 22 * TODO: 23 * o Refer loglevel for log output 24 * o Better option log display 25 */ 26#include <sys/param.h> 27#include <netinet/in.h> 28 29#include <stdio.h> 30#include <string.h> 31#include <termios.h> 32 33#include "command.h" 34#include "mbuf.h" 35#include "log.h" 36#include "defs.h" 37#include "timer.h" 38#include "fsm.h" 39#include "hdlc.h" 40#include "lqr.h" 41#include "lcpproto.h" 42#include "lcp.h" 43#include "ccp.h" 44#include "modem.h" 45#include "loadalias.h" 46#include "vars.h" 47 48u_char AckBuff[200]; 49u_char NakBuff[200]; 50u_char RejBuff[100]; 51u_char ReqBuff[200]; 52u_char *ackp = NULL; 53u_char *nakp = NULL; 54u_char *rejp = NULL; 55 56static void FsmSendConfigReq(struct fsm *); 57static void FsmSendTerminateReq(struct fsm *); 58static void FsmInitRestartCounter(struct fsm *); 59 60char const *StateNames[] = { 61 "Initial", "Starting", "Closed", "Stopped", "Closing", "Stopping", 62 "Req-Sent", "Ack-Rcvd", "Ack-Sent", "Opened", 63}; 64 65static void 66StoppedTimeout(void *v) 67{ 68 struct fsm *fp = (struct fsm *)v; 69 70 LogPrintf(fp->LogLevel, "Stopped timer expired\n"); 71 if (modem != -1) 72 DownConnection(); 73 else 74 FsmDown(fp); 75} 76 77void 78FsmInit(struct fsm * fp) 79{ 80 LogPrintf(LogDEBUG, "FsmInit\n"); 81 fp->state = ST_INITIAL; 82 fp->reqid = 1; 83 fp->restart = 1; 84 fp->maxconfig = 3; 85} 86 87static void 88NewState(struct fsm * fp, int new) 89{ 90 LogPrintf(fp->LogLevel, "State change %s --> %s\n", 91 StateNames[fp->state], StateNames[new]); 92 if (fp->state == ST_STOPPED && fp->StoppedTimer.state == TIMER_RUNNING) 93 StopTimer(&fp->StoppedTimer); 94 fp->state = new; 95 if ((new >= ST_INITIAL && new <= ST_STOPPED) || (new == ST_OPENED)) { 96 StopTimer(&fp->FsmTimer); 97 if (new == ST_STOPPED && fp->StoppedTimer.load) { 98 fp->StoppedTimer.state = TIMER_STOPPED; 99 fp->StoppedTimer.func = StoppedTimeout; 100 fp->StoppedTimer.arg = (void *) fp; 101 StartTimer(&fp->StoppedTimer); 102 } 103 } 104} 105 106void 107FsmOutput(struct fsm * fp, u_int code, u_int id, u_char * ptr, int count) 108{ 109 int plen; 110 struct fsmheader lh; 111 struct mbuf *bp; 112 113 plen = sizeof(struct fsmheader) + count; 114 lh.code = code; 115 lh.id = id; 116 lh.length = htons(plen); 117 bp = mballoc(plen, MB_FSM); 118 memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader)); 119 if (count) 120 memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count); 121 LogDumpBp(LogDEBUG, "FsmOutput", bp); 122 HdlcOutput(PRI_LINK, fp->proto, bp); 123} 124 125void 126FsmOpen(struct fsm * fp) 127{ 128 switch (fp->state) { 129 case ST_INITIAL: 130 (fp->LayerStart) (fp); 131 NewState(fp, ST_STARTING); 132 break; 133 case ST_STARTING: 134 break; 135 case ST_CLOSED: 136 if (fp->open_mode == OPEN_PASSIVE) { 137 NewState(fp, ST_STOPPED); 138 } else { 139 FsmInitRestartCounter(fp); 140 FsmSendConfigReq(fp); 141 NewState(fp, ST_REQSENT); 142 } 143 break; 144 case ST_STOPPED: /* XXX: restart option */ 145 case ST_REQSENT: 146 case ST_ACKRCVD: 147 case ST_ACKSENT: 148 case ST_OPENED: /* XXX: restart option */ 149 break; 150 case ST_CLOSING: /* XXX: restart option */ 151 case ST_STOPPING: /* XXX: restart option */ 152 NewState(fp, ST_STOPPING); 153 break; 154 } 155} 156 157void 158FsmUp(struct fsm * fp) 159{ 160 switch (fp->state) { 161 case ST_INITIAL: 162 NewState(fp, ST_CLOSED); 163 break; 164 case ST_STARTING: 165 FsmInitRestartCounter(fp); 166 FsmSendConfigReq(fp); 167 NewState(fp, ST_REQSENT); 168 break; 169 default: 170 LogPrintf(fp->LogLevel, "Oops, Up at %s\n", StateNames[fp->state]); 171 break; 172 } 173} 174 175void 176FsmDown(struct fsm * fp) 177{ 178 switch (fp->state) { 179 case ST_CLOSED: 180 case ST_CLOSING: 181 NewState(fp, ST_INITIAL); 182 break; 183 case ST_STOPPED: 184 (fp->LayerStart) (fp); 185 /* Fall into.. */ 186 case ST_STOPPING: 187 case ST_REQSENT: 188 case ST_ACKRCVD: 189 case ST_ACKSENT: 190 NewState(fp, ST_STARTING); 191 break; 192 case ST_OPENED: 193 (fp->LayerDown) (fp); 194 NewState(fp, ST_STARTING); 195 break; 196 } 197} 198 199void 200FsmClose(struct fsm * fp) 201{ 202 switch (fp->state) { 203 case ST_STARTING: 204 NewState(fp, ST_INITIAL); 205 break; 206 case ST_STOPPED: 207 NewState(fp, ST_CLOSED); 208 break; 209 case ST_STOPPING: 210 NewState(fp, ST_CLOSING); 211 break; 212 case ST_OPENED: 213 (fp->LayerDown) (fp); 214 /* Fall down */ 215 case ST_REQSENT: 216 case ST_ACKRCVD: 217 case ST_ACKSENT: 218 FsmInitRestartCounter(fp); 219 FsmSendTerminateReq(fp); 220 NewState(fp, ST_CLOSING); 221 break; 222 } 223} 224 225/* 226 * Send functions 227 */ 228static void 229FsmSendConfigReq(struct fsm * fp) 230{ 231 if (--fp->maxconfig > 0) { 232 (fp->SendConfigReq) (fp); 233 StartTimer(&fp->FsmTimer); /* Start restart timer */ 234 fp->restart--; /* Decrement restart counter */ 235 } else { 236 FsmClose(fp); 237 } 238} 239 240static void 241FsmSendTerminateReq(struct fsm * fp) 242{ 243 LogPrintf(fp->LogLevel, "SendTerminateReq.\n"); 244 FsmOutput(fp, CODE_TERMREQ, fp->reqid++, NULL, 0); 245 (fp->SendTerminateReq) (fp); 246 StartTimer(&fp->FsmTimer); /* Start restart timer */ 247 fp->restart--; /* Decrement restart counter */ 248} 249 250static void 251FsmSendConfigAck(struct fsm * fp, 252 struct fsmheader * lhp, 253 u_char * option, 254 int count) 255{ 256 LogPrintf(fp->LogLevel, "SendConfigAck(%s)\n", StateNames[fp->state]); 257 (fp->DecodeConfig) (option, count, MODE_NOP); 258 FsmOutput(fp, CODE_CONFIGACK, lhp->id, option, count); 259} 260 261static void 262FsmSendConfigRej(struct fsm * fp, 263 struct fsmheader * lhp, 264 u_char * option, 265 int count) 266{ 267 LogPrintf(fp->LogLevel, "SendConfigRej(%s)\n", StateNames[fp->state]); 268 (fp->DecodeConfig) (option, count, MODE_NOP); 269 FsmOutput(fp, CODE_CONFIGREJ, lhp->id, option, count); 270} 271 272static void 273FsmSendConfigNak(struct fsm * fp, 274 struct fsmheader * lhp, 275 u_char * option, 276 int count) 277{ 278 LogPrintf(fp->LogLevel, "SendConfigNak(%s)\n", StateNames[fp->state]); 279 (fp->DecodeConfig) (option, count, MODE_NOP); 280 FsmOutput(fp, CODE_CONFIGNAK, lhp->id, option, count); 281} 282 283/* 284 * Timeout actions 285 */ 286static void 287FsmTimeout(void *v) 288{ 289 struct fsm *fp = (struct fsm *)v; 290 291 if (fp->restart) { 292 switch (fp->state) { 293 case ST_CLOSING: 294 case ST_STOPPING: 295 FsmSendTerminateReq(fp); 296 break; 297 case ST_REQSENT: 298 case ST_ACKSENT: 299 FsmSendConfigReq(fp); 300 break; 301 case ST_ACKRCVD: 302 FsmSendConfigReq(fp); 303 NewState(fp, ST_REQSENT); 304 break; 305 } 306 StartTimer(&fp->FsmTimer); 307 } else { 308 switch (fp->state) { 309 case ST_CLOSING: 310 NewState(fp, ST_CLOSED); 311 (fp->LayerFinish) (fp); 312 break; 313 case ST_STOPPING: 314 NewState(fp, ST_STOPPED); 315 (fp->LayerFinish) (fp); 316 break; 317 case ST_REQSENT: /* XXX: 3p */ 318 case ST_ACKSENT: 319 case ST_ACKRCVD: 320 NewState(fp, ST_STOPPED); 321 (fp->LayerFinish) (fp); 322 break; 323 } 324 } 325} 326 327static void 328FsmInitRestartCounter(struct fsm * fp) 329{ 330 StopTimer(&fp->FsmTimer); 331 fp->FsmTimer.state = TIMER_STOPPED; 332 fp->FsmTimer.func = FsmTimeout; 333 fp->FsmTimer.arg = (void *) fp; 334 (fp->InitRestartCounter) (fp); 335} 336 337/* 338 * Actions when receive packets 339 */ 340static void 341FsmRecvConfigReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 342/* RCR */ 343{ 344 int plen, flen; 345 int ackaction = 0; 346 347 plen = plength(bp); 348 flen = ntohs(lhp->length) - sizeof *lhp; 349 if (plen < flen) { 350 LogPrintf(LogERROR, "FsmRecvConfigReq: plen (%d) < flen (%d)\n", 351 plen, flen); 352 pfree(bp); 353 return; 354 } 355 356 /* 357 * Check and process easy case 358 */ 359 switch (fp->state) { 360 case ST_INITIAL: 361 case ST_STARTING: 362 LogPrintf(fp->LogLevel, "Oops, RCR in %s.\n", StateNames[fp->state]); 363 pfree(bp); 364 return; 365 case ST_CLOSED: 366 (fp->SendTerminateAck) (fp); 367 pfree(bp); 368 return; 369 case ST_CLOSING: 370 LogPrintf(fp->LogLevel, "Error: Got ConfigReq while state = %d\n", 371 fp->state); 372 case ST_STOPPING: 373 pfree(bp); 374 return; 375 } 376 377 (fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_REQ); 378 379 if (nakp == NakBuff && rejp == RejBuff) 380 ackaction = 1; 381 382 switch (fp->state) { 383 case ST_OPENED: 384 (fp->LayerDown) (fp); 385 FsmSendConfigReq(fp); 386 break; 387 case ST_STOPPED: 388 FsmInitRestartCounter(fp); 389 FsmSendConfigReq(fp); 390 break; 391 } 392 393 if (rejp != RejBuff) 394 FsmSendConfigRej(fp, lhp, RejBuff, rejp - RejBuff); 395 if (nakp != NakBuff) 396 FsmSendConfigNak(fp, lhp, NakBuff, nakp - NakBuff); 397 if (ackaction) 398 FsmSendConfigAck(fp, lhp, AckBuff, ackp - AckBuff); 399 400 switch (fp->state) { 401 case ST_STOPPED: 402 case ST_OPENED: 403 if (ackaction) 404 NewState(fp, ST_ACKSENT); 405 else 406 NewState(fp, ST_REQSENT); 407 break; 408 case ST_REQSENT: 409 if (ackaction) 410 NewState(fp, ST_ACKSENT); 411 break; 412 case ST_ACKRCVD: 413 if (ackaction) { 414 NewState(fp, ST_OPENED); 415 (fp->LayerUp) (fp); 416 } 417 break; 418 case ST_ACKSENT: 419 if (!ackaction) 420 NewState(fp, ST_REQSENT); 421 break; 422 } 423 pfree(bp); 424} 425 426static void 427FsmRecvConfigAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 428/* RCA */ 429{ 430 switch (fp->state) { 431 case ST_CLOSED: 432 case ST_STOPPED: 433 (fp->SendTerminateAck) (fp); 434 break; 435 case ST_CLOSING: 436 case ST_STOPPING: 437 break; 438 case ST_REQSENT: 439 FsmInitRestartCounter(fp); 440 NewState(fp, ST_ACKRCVD); 441 break; 442 case ST_ACKRCVD: 443 FsmSendConfigReq(fp); 444 NewState(fp, ST_REQSENT); 445 break; 446 case ST_ACKSENT: 447 FsmInitRestartCounter(fp); 448 NewState(fp, ST_OPENED); 449 (fp->LayerUp) (fp); 450 break; 451 case ST_OPENED: 452 (fp->LayerDown) (fp); 453 FsmSendConfigReq(fp); 454 NewState(fp, ST_REQSENT); 455 break; 456 } 457 pfree(bp); 458} 459 460static void 461FsmRecvConfigNak(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 462/* RCN */ 463{ 464 int plen, flen; 465 466 plen = plength(bp); 467 flen = ntohs(lhp->length) - sizeof *lhp; 468 if (plen < flen) { 469 pfree(bp); 470 return; 471 } 472 473 /* 474 * Check and process easy case 475 */ 476 switch (fp->state) { 477 case ST_INITIAL: 478 case ST_STARTING: 479 LogPrintf(fp->LogLevel, "Oops, RCN in %s.\n", StateNames[fp->state]); 480 pfree(bp); 481 return; 482 case ST_CLOSED: 483 case ST_STOPPED: 484 (fp->SendTerminateAck) (fp); 485 pfree(bp); 486 return; 487 case ST_CLOSING: 488 case ST_STOPPING: 489 pfree(bp); 490 return; 491 } 492 493 (fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_NAK); 494 495 switch (fp->state) { 496 case ST_REQSENT: 497 case ST_ACKSENT: 498 FsmInitRestartCounter(fp); 499 FsmSendConfigReq(fp); 500 break; 501 case ST_OPENED: 502 (fp->LayerDown) (fp); 503 /* Fall down */ 504 case ST_ACKRCVD: 505 FsmSendConfigReq(fp); 506 NewState(fp, ST_REQSENT); 507 break; 508 } 509 510 pfree(bp); 511} 512 513static void 514FsmRecvTermReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 515/* RTR */ 516{ 517 switch (fp->state) { 518 case ST_INITIAL: 519 case ST_STARTING: 520 LogPrintf(fp->LogLevel, "Oops, RTR in %s\n", StateNames[fp->state]); 521 break; 522 case ST_CLOSED: 523 case ST_STOPPED: 524 case ST_CLOSING: 525 case ST_STOPPING: 526 case ST_REQSENT: 527 (fp->SendTerminateAck) (fp); 528 break; 529 case ST_ACKRCVD: 530 case ST_ACKSENT: 531 (fp->SendTerminateAck) (fp); 532 NewState(fp, ST_REQSENT); 533 break; 534 case ST_OPENED: 535 (fp->LayerDown) (fp); 536 (fp->SendTerminateAck) (fp); 537 StartTimer(&fp->FsmTimer); /* Start restart timer */ 538 fp->restart = 0; 539 NewState(fp, ST_STOPPING); 540 break; 541 } 542 pfree(bp); 543} 544 545static void 546FsmRecvTermAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 547/* RTA */ 548{ 549 switch (fp->state) { 550 case ST_CLOSING: 551 NewState(fp, ST_CLOSED); 552 (fp->LayerFinish) (fp); 553 break; 554 case ST_STOPPING: 555 NewState(fp, ST_STOPPED); 556 (fp->LayerFinish) (fp); 557 break; 558 case ST_ACKRCVD: 559 NewState(fp, ST_REQSENT); 560 break; 561 case ST_OPENED: 562 (fp->LayerDown) (fp); 563 FsmSendConfigReq(fp); 564 NewState(fp, ST_REQSENT); 565 break; 566 } 567 pfree(bp); 568} 569 570static void 571FsmRecvConfigRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 572/* RCJ */ 573{ 574 int plen, flen; 575 576 plen = plength(bp); 577 flen = ntohs(lhp->length) - sizeof *lhp; 578 if (plen < flen) { 579 pfree(bp); 580 return; 581 } 582 LogPrintf(fp->LogLevel, "RecvConfigRej.\n"); 583 584 /* 585 * Check and process easy case 586 */ 587 switch (fp->state) { 588 case ST_INITIAL: 589 case ST_STARTING: 590 LogPrintf(fp->LogLevel, "Oops, RCJ in %s.\n", StateNames[fp->state]); 591 pfree(bp); 592 return; 593 case ST_CLOSED: 594 case ST_STOPPED: 595 (fp->SendTerminateAck) (fp); 596 pfree(bp); 597 return; 598 case ST_CLOSING: 599 case ST_STOPPING: 600 pfree(bp); 601 return; 602 } 603 604 (fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_REJ); 605 606 switch (fp->state) { 607 case ST_REQSENT: 608 case ST_ACKSENT: 609 FsmInitRestartCounter(fp); 610 FsmSendConfigReq(fp); 611 break; 612 case ST_OPENED: 613 (fp->LayerDown) (fp); 614 /* Fall down */ 615 case ST_ACKRCVD: 616 FsmSendConfigReq(fp); 617 NewState(fp, ST_REQSENT); 618 break; 619 } 620 pfree(bp); 621} 622 623static void 624FsmRecvCodeRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 625{ 626 LogPrintf(fp->LogLevel, "RecvCodeRej\n"); 627 pfree(bp); 628} 629 630static void 631FsmRecvProtoRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 632{ 633 u_short *sp, proto; 634 635 sp = (u_short *) MBUF_CTOP(bp); 636 proto = ntohs(*sp); 637 LogPrintf(fp->LogLevel, "-- Protocol (%04x) was rejected.\n", proto); 638 639 switch (proto) { 640 case PROTO_LQR: 641 StopLqr(LQM_LQR); 642 break; 643 case PROTO_CCP: 644 fp = &CcpFsm; 645 (fp->LayerFinish) (fp); 646 switch (fp->state) { 647 case ST_CLOSED: 648 case ST_CLOSING: 649 NewState(fp, ST_CLOSED); 650 default: 651 NewState(fp, ST_STOPPED); 652 break; 653 } 654 break; 655 } 656 pfree(bp); 657} 658 659static void 660FsmRecvEchoReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 661{ 662 u_char *cp; 663 u_long *lp, magic; 664 665 cp = MBUF_CTOP(bp); 666 lp = (u_long *) cp; 667 magic = ntohl(*lp); 668 if (magic != LcpInfo.his_magic) { 669 LogPrintf(LogERROR, "RecvEchoReq: his magic is bad!!\n"); 670 /* XXX: We should send terminate request */ 671 } 672 if (fp->state == ST_OPENED) { 673 *lp = htonl(LcpInfo.want_magic); /* Insert local magic number */ 674 LogPrintf(fp->LogLevel, "SendEchoRep(%s)\n", StateNames[fp->state]); 675 FsmOutput(fp, CODE_ECHOREP, lhp->id, cp, plength(bp)); 676 } 677 pfree(bp); 678} 679 680static void 681FsmRecvEchoRep(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 682{ 683 u_long *lp, magic; 684 685 lp = (u_long *) MBUF_CTOP(bp); 686 magic = ntohl(*lp); 687/* 688 * Tolerate echo replies with either magic number 689 */ 690 if (magic != 0 && magic != LcpInfo.his_magic && magic != LcpInfo.want_magic) { 691 LogPrintf(LogERROR, "RecvEchoRep: his magic is wrong! expect: %x got: %x\n", 692 LcpInfo.his_magic, magic); 693 694 /* 695 * XXX: We should send terminate request. But poor implementation may die 696 * as a result. 697 */ 698 } 699 RecvEchoLqr(bp); 700 pfree(bp); 701} 702 703static void 704FsmRecvDiscReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 705{ 706 LogPrintf(fp->LogLevel, "RecvDiscReq\n"); 707 pfree(bp); 708} 709 710static void 711FsmRecvIdent(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 712{ 713 LogPrintf(fp->LogLevel, "RecvIdent\n"); 714 pfree(bp); 715} 716 717static void 718FsmRecvTimeRemain(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 719{ 720 LogPrintf(fp->LogLevel, "RecvTimeRemain\n"); 721 pfree(bp); 722} 723 724static void 725FsmRecvResetReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 726{ 727 LogPrintf(fp->LogLevel, "RecvResetReq(%d)\n", lhp->id); 728 CcpRecvResetReq(fp); 729 /* 730 * All sendable compressed packets are queued in the PRI_NORMAL modem 731 * output queue.... dump 'em to the priority queue so that they arrive 732 * at the peer before our ResetAck. 733 */ 734 SequenceQueues(); 735 LogPrintf(fp->LogLevel, "SendResetAck(%d)\n", lhp->id); 736 FsmOutput(fp, CODE_RESETACK, lhp->id, NULL, 0); 737 pfree(bp); 738} 739 740static void 741FsmRecvResetAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp) 742{ 743 LogPrintf(fp->LogLevel, "RecvResetAck(%d)\n", lhp->id); 744 CcpResetInput(lhp->id); 745 fp->reqid++; 746 pfree(bp); 747} 748 749static const struct fsmcodedesc FsmCodes[] = { 750 {FsmRecvConfigReq, "Configure Request",}, 751 {FsmRecvConfigAck, "Configure Ack",}, 752 {FsmRecvConfigNak, "Configure Nak",}, 753 {FsmRecvConfigRej, "Configure Reject",}, 754 {FsmRecvTermReq, "Terminate Request",}, 755 {FsmRecvTermAck, "Terminate Ack",}, 756 {FsmRecvCodeRej, "Code Reject",}, 757 {FsmRecvProtoRej, "Protocol Reject",}, 758 {FsmRecvEchoReq, "Echo Request",}, 759 {FsmRecvEchoRep, "Echo Reply",}, 760 {FsmRecvDiscReq, "Discard Request",}, 761 {FsmRecvIdent, "Ident",}, 762 {FsmRecvTimeRemain, "Time Remain",}, 763 {FsmRecvResetReq, "Reset Request",}, 764 {FsmRecvResetAck, "Reset Ack",}, 765}; 766 767void 768FsmInput(struct fsm * fp, struct mbuf * bp) 769{ 770 int len; 771 struct fsmheader *lhp; 772 const struct fsmcodedesc *codep; 773 774 len = plength(bp); 775 if (len < sizeof(struct fsmheader)) { 776 pfree(bp); 777 return; 778 } 779 lhp = (struct fsmheader *) MBUF_CTOP(bp); 780 if (lhp->code == 0 || lhp->code > fp->max_code) { 781 pfree(bp); /* XXX: Should send code reject */ 782 return; 783 } 784 bp->offset += sizeof(struct fsmheader); 785 bp->cnt -= sizeof(struct fsmheader); 786 787 codep = FsmCodes + lhp->code - 1; 788 LogPrintf(fp->LogLevel, "Received %s (%d) state = %s (%d)\n", 789 codep->name, lhp->id, StateNames[fp->state], fp->state); 790 if (LogIsKept(LogDEBUG)) 791 LogMemory(); 792 (codep->action) (fp, lhp, bp); 793 if (LogIsKept(LogDEBUG)) 794 LogMemory(); 795} 796