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/ccp.c,v 1.54.2.7 2002/09/01 02:12:22 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/ccp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <netinet/in.h> 34 #include <netinet/in_systm.h> 35 #include <netinet/ip.h> 36 #include <sys/socket.h> 37 #include <sys/un.h> 38 39 #include <stdarg.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> /* memcpy() on some archs */ 43 #include <termios.h> 44 45 #include "layer.h" 46 #include "defs.h" 47 #include "command.h" 48 #include "mbuf.h" 49 #include "log.h" 50 #include "timer.h" 51 #include "fsm.h" 52 #include "proto.h" 53 #include "pred.h" 54 #include "deflate.h" 55 #include "throughput.h" 56 #include "iplist.h" 57 #include "slcompress.h" 58 #include "lqr.h" 59 #include "hdlc.h" 60 #include "lcp.h" 61 #include "ccp.h" 62 #include "ncpaddr.h" 63 #include "ipcp.h" 64 #include "filter.h" 65 #include "descriptor.h" 66 #include "prompt.h" 67 #include "link.h" 68 #include "mp.h" 69 #include "async.h" 70 #include "physical.h" 71 #ifndef NORADIUS 72 #include "radius.h" 73 #endif 74 #ifndef NODES 75 #include "mppe.h" 76 #endif 77 #include "ipv6cp.h" 78 #include "ncp.h" 79 #include "bundle.h" 80 81 static void CcpSendConfigReq(struct fsm *); 82 static void CcpSentTerminateReq(struct fsm *); 83 static void CcpSendTerminateAck(struct fsm *, u_char); 84 static void CcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 85 struct fsm_decode *); 86 static void CcpLayerStart(struct fsm *); 87 static void CcpLayerFinish(struct fsm *); 88 static int CcpLayerUp(struct fsm *); 89 static void CcpLayerDown(struct fsm *); 90 static void CcpInitRestartCounter(struct fsm *, int); 91 static int CcpRecvResetReq(struct fsm *); 92 static void CcpRecvResetAck(struct fsm *, u_char); 93 94 static struct fsm_callbacks ccp_Callbacks = { 95 CcpLayerUp, 96 CcpLayerDown, 97 CcpLayerStart, 98 CcpLayerFinish, 99 CcpInitRestartCounter, 100 CcpSendConfigReq, 101 CcpSentTerminateReq, 102 CcpSendTerminateAck, 103 CcpDecodeConfig, 104 CcpRecvResetReq, 105 CcpRecvResetAck 106 }; 107 108 static const char * const ccp_TimerNames[] = 109 {"CCP restart", "CCP openmode", "CCP stopped"}; 110 111 static const char * 112 protoname(int proto) 113 { 114 static char const * const cftypes[] = { 115 /* Check out the latest ``Compression Control Protocol'' rfc (1962) */ 116 "OUI", /* 0: OUI */ 117 "PRED1", /* 1: Predictor type 1 */ 118 "PRED2", /* 2: Predictor type 2 */ 119 "PUDDLE", /* 3: Puddle Jumber */ 120 NULL, NULL, NULL, NULL, NULL, NULL, 121 NULL, NULL, NULL, NULL, NULL, NULL, 122 "HWPPC", /* 16: Hewlett-Packard PPC */ 123 "STAC", /* 17: Stac Electronics LZS (rfc1974) */ 124 "MPPE", /* 18: Microsoft PPC (rfc2118) and */ 125 /* Microsoft PPE (draft-ietf-pppext-mppe) */ 126 "GAND", /* 19: Gandalf FZA (rfc1993) */ 127 "V42BIS", /* 20: ARG->DATA.42bis compression */ 128 "BSD", /* 21: BSD LZW Compress */ 129 NULL, 130 "LZS-DCP", /* 23: LZS-DCP Compression Protocol (rfc1967) */ 131 "MAGNALINK/DEFLATE",/* 24: Magnalink Variable Resource (rfc1975) */ 132 /* 24: Deflate (according to pppd-2.3.*) */ 133 "DCE", /* 25: Data Circuit-Terminating Equip (rfc1976) */ 134 "DEFLATE", /* 26: Deflate (rfc1979) */ 135 }; 136 137 if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes || 138 cftypes[proto] == NULL) { 139 if (proto == -1) 140 return "none"; 141 return HexStr(proto, NULL, 0); 142 } 143 144 return cftypes[proto]; 145 } 146 147 /* We support these algorithms, and Req them in the given order */ 148 static const struct ccp_algorithm * const algorithm[] = { 149 &DeflateAlgorithm, 150 &Pred1Algorithm, 151 &PppdDeflateAlgorithm 152 #ifndef NODES 153 , &MPPEAlgorithm 154 #endif 155 }; 156 157 #define NALGORITHMS (sizeof algorithm/sizeof algorithm[0]) 158 159 int 160 ccp_ReportStatus(struct cmdargs const *arg) 161 { 162 struct ccp_opt **o; 163 struct link *l; 164 struct ccp *ccp; 165 int f; 166 167 l = command_ChooseLink(arg); 168 ccp = &l->ccp; 169 170 prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, ccp->fsm.name, 171 State2Nam(ccp->fsm.state)); 172 if (ccp->fsm.state == ST_OPENED) { 173 prompt_Printf(arg->prompt, " My protocol = %s, His protocol = %s\n", 174 protoname(ccp->my_proto), protoname(ccp->his_proto)); 175 prompt_Printf(arg->prompt, " Output: %ld --> %ld, Input: %ld --> %ld\n", 176 ccp->uncompout, ccp->compout, 177 ccp->compin, ccp->uncompin); 178 } 179 180 if (ccp->in.algorithm != -1) 181 prompt_Printf(arg->prompt, "\n Input Options: %s\n", 182 (*algorithm[ccp->in.algorithm]->Disp)(&ccp->in.opt)); 183 184 if (ccp->out.algorithm != -1) { 185 o = &ccp->out.opt; 186 for (f = 0; f < ccp->out.algorithm; f++) 187 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg])) 188 o = &(*o)->next; 189 prompt_Printf(arg->prompt, " Output Options: %s\n", 190 (*algorithm[ccp->out.algorithm]->Disp)(&(*o)->val)); 191 } 192 193 prompt_Printf(arg->prompt, "\n Defaults: "); 194 prompt_Printf(arg->prompt, "FSM retry = %us, max %u Config" 195 " REQ%s, %u Term REQ%s\n", ccp->cfg.fsm.timeout, 196 ccp->cfg.fsm.maxreq, ccp->cfg.fsm.maxreq == 1 ? "" : "s", 197 ccp->cfg.fsm.maxtrm, ccp->cfg.fsm.maxtrm == 1 ? "" : "s"); 198 prompt_Printf(arg->prompt, " deflate windows: "); 199 prompt_Printf(arg->prompt, "incoming = %d, ", ccp->cfg.deflate.in.winsize); 200 prompt_Printf(arg->prompt, "outgoing = %d\n", ccp->cfg.deflate.out.winsize); 201 #ifndef NODES 202 prompt_Printf(arg->prompt, " MPPE: "); 203 if (ccp->cfg.mppe.keybits) 204 prompt_Printf(arg->prompt, "%d bits, ", ccp->cfg.mppe.keybits); 205 else 206 prompt_Printf(arg->prompt, "any bits, "); 207 switch (ccp->cfg.mppe.state) { 208 case MPPE_STATEFUL: 209 prompt_Printf(arg->prompt, "stateful"); 210 break; 211 case MPPE_STATELESS: 212 prompt_Printf(arg->prompt, "stateless"); 213 break; 214 case MPPE_ANYSTATE: 215 prompt_Printf(arg->prompt, "any state"); 216 break; 217 } 218 prompt_Printf(arg->prompt, "%s\n", 219 ccp->cfg.mppe.required ? ", required" : ""); 220 #endif 221 222 prompt_Printf(arg->prompt, "\n DEFLATE: %s\n", 223 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE])); 224 prompt_Printf(arg->prompt, " PREDICTOR1: %s\n", 225 command_ShowNegval(ccp->cfg.neg[CCP_NEG_PRED1])); 226 prompt_Printf(arg->prompt, " DEFLATE24: %s\n", 227 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE24])); 228 #ifndef NODES 229 prompt_Printf(arg->prompt, " MPPE: %s\n", 230 command_ShowNegval(ccp->cfg.neg[CCP_NEG_MPPE])); 231 #endif 232 return 0; 233 } 234 235 void 236 ccp_SetupCallbacks(struct ccp *ccp) 237 { 238 ccp->fsm.fn = &ccp_Callbacks; 239 ccp->fsm.FsmTimer.name = ccp_TimerNames[0]; 240 ccp->fsm.OpenTimer.name = ccp_TimerNames[1]; 241 ccp->fsm.StoppedTimer.name = ccp_TimerNames[2]; 242 } 243 244 void 245 ccp_Init(struct ccp *ccp, struct bundle *bundle, struct link *l, 246 const struct fsm_parent *parent) 247 { 248 /* Initialise ourselves */ 249 250 fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, LogCCP, 251 bundle, l, parent, &ccp_Callbacks, ccp_TimerNames); 252 253 ccp->cfg.deflate.in.winsize = 0; 254 ccp->cfg.deflate.out.winsize = 15; 255 ccp->cfg.fsm.timeout = DEF_FSMRETRY; 256 ccp->cfg.fsm.maxreq = DEF_FSMTRIES; 257 ccp->cfg.fsm.maxtrm = DEF_FSMTRIES; 258 ccp->cfg.neg[CCP_NEG_DEFLATE] = NEG_ENABLED|NEG_ACCEPTED; 259 ccp->cfg.neg[CCP_NEG_PRED1] = NEG_ENABLED|NEG_ACCEPTED; 260 ccp->cfg.neg[CCP_NEG_DEFLATE24] = 0; 261 #ifndef NODES 262 ccp->cfg.mppe.keybits = 0; 263 ccp->cfg.mppe.state = MPPE_ANYSTATE; 264 ccp->cfg.mppe.required = 0; 265 ccp->cfg.neg[CCP_NEG_MPPE] = NEG_ENABLED|NEG_ACCEPTED; 266 #endif 267 268 ccp_Setup(ccp); 269 } 270 271 void 272 ccp_Setup(struct ccp *ccp) 273 { 274 /* Set ourselves up for a startup */ 275 ccp->fsm.open_mode = 0; 276 ccp->his_proto = ccp->my_proto = -1; 277 ccp->reset_sent = ccp->last_reset = -1; 278 ccp->in.algorithm = ccp->out.algorithm = -1; 279 ccp->in.state = ccp->out.state = NULL; 280 ccp->in.opt.hdr.id = -1; 281 ccp->out.opt = NULL; 282 ccp->his_reject = ccp->my_reject = 0; 283 ccp->uncompout = ccp->compout = 0; 284 ccp->uncompin = ccp->compin = 0; 285 } 286 287 /* 288 * Is ccp *REQUIRED* ? 289 * We ask each of the configured ccp protocols if they're required and 290 * return TRUE if they are. 291 * 292 * It's not possible for the peer to reject a required ccp protocol 293 * without our state machine bringing the supporting lcp layer down. 294 * 295 * If ccp is required but not open, the NCP layer should not push 296 * any data into the link. 297 */ 298 int 299 ccp_Required(struct ccp *ccp) 300 { 301 int f; 302 303 for (f = 0; f < NALGORITHMS; f++) 304 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) && 305 (*algorithm[f]->Required)(&ccp->fsm)) 306 return 1; 307 308 return 0; 309 } 310 311 /* 312 * Report whether it's possible to increase a packet's size after 313 * compression (and by how much). 314 */ 315 int 316 ccp_MTUOverhead(struct ccp *ccp) 317 { 318 if (ccp->fsm.state == ST_OPENED && ccp->out.algorithm >= 0) 319 return algorithm[ccp->out.algorithm]->o.MTUOverhead; 320 321 return 0; 322 } 323 324 static void 325 CcpInitRestartCounter(struct fsm *fp, int what) 326 { 327 /* Set fsm timer load */ 328 struct ccp *ccp = fsm2ccp(fp); 329 330 fp->FsmTimer.load = ccp->cfg.fsm.timeout * SECTICKS; 331 switch (what) { 332 case FSM_REQ_TIMER: 333 fp->restart = ccp->cfg.fsm.maxreq; 334 break; 335 case FSM_TRM_TIMER: 336 fp->restart = ccp->cfg.fsm.maxtrm; 337 break; 338 default: 339 fp->restart = 1; 340 break; 341 } 342 } 343 344 static void 345 CcpSendConfigReq(struct fsm *fp) 346 { 347 /* Send config REQ please */ 348 struct ccp *ccp = fsm2ccp(fp); 349 struct ccp_opt **o; 350 u_char *cp, buff[100]; 351 int f, alloc; 352 353 cp = buff; 354 o = &ccp->out.opt; 355 alloc = ccp->his_reject == 0 && ccp->out.opt == NULL; 356 ccp->my_proto = -1; 357 ccp->out.algorithm = -1; 358 for (f = 0; f < NALGORITHMS; f++) 359 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) && 360 !REJECTED(ccp, algorithm[f]->id) && 361 (*algorithm[f]->Usable)(fp)) { 362 363 if (!alloc) 364 for (o = &ccp->out.opt; *o != NULL; o = &(*o)->next) 365 if ((*o)->val.hdr.id == algorithm[f]->id && (*o)->algorithm == f) 366 break; 367 368 if (alloc || *o == NULL) { 369 *o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt)); 370 (*o)->val.hdr.id = algorithm[f]->id; 371 (*o)->val.hdr.len = 2; 372 (*o)->next = NULL; 373 (*o)->algorithm = f; 374 (*algorithm[f]->o.OptInit)(fp->bundle, &(*o)->val, &ccp->cfg); 375 } 376 377 if (cp + (*o)->val.hdr.len > buff + sizeof buff) { 378 log_Printf(LogERROR, "%s: CCP REQ buffer overrun !\n", fp->link->name); 379 break; 380 } 381 memcpy(cp, &(*o)->val, (*o)->val.hdr.len); 382 cp += (*o)->val.hdr.len; 383 384 ccp->my_proto = (*o)->val.hdr.id; 385 ccp->out.algorithm = f; 386 387 if (alloc) 388 o = &(*o)->next; 389 } 390 391 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff, MB_CCPOUT); 392 } 393 394 void 395 ccp_SendResetReq(struct fsm *fp) 396 { 397 /* We can't read our input - ask peer to reset */ 398 struct ccp *ccp = fsm2ccp(fp); 399 400 ccp->reset_sent = fp->reqid; 401 ccp->last_reset = -1; 402 fsm_Output(fp, CODE_RESETREQ, fp->reqid, NULL, 0, MB_CCPOUT); 403 } 404 405 static void 406 CcpSentTerminateReq(struct fsm *fp) 407 { 408 /* Term REQ just sent by FSM */ 409 } 410 411 static void 412 CcpSendTerminateAck(struct fsm *fp, u_char id) 413 { 414 /* Send Term ACK please */ 415 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_CCPOUT); 416 } 417 418 static int 419 CcpRecvResetReq(struct fsm *fp) 420 { 421 /* Got a reset REQ, reset outgoing dictionary */ 422 struct ccp *ccp = fsm2ccp(fp); 423 if (ccp->out.state == NULL) 424 return 1; 425 return (*algorithm[ccp->out.algorithm]->o.Reset)(ccp->out.state); 426 } 427 428 static void 429 CcpLayerStart(struct fsm *fp) 430 { 431 /* We're about to start up ! */ 432 struct ccp *ccp = fsm2ccp(fp); 433 434 log_Printf(LogCCP, "%s: LayerStart.\n", fp->link->name); 435 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3; 436 } 437 438 static void 439 CcpLayerDown(struct fsm *fp) 440 { 441 /* About to come down */ 442 struct ccp *ccp = fsm2ccp(fp); 443 struct ccp_opt *next; 444 445 log_Printf(LogCCP, "%s: LayerDown.\n", fp->link->name); 446 if (ccp->in.state != NULL) { 447 (*algorithm[ccp->in.algorithm]->i.Term)(ccp->in.state); 448 ccp->in.state = NULL; 449 ccp->in.algorithm = -1; 450 } 451 if (ccp->out.state != NULL) { 452 (*algorithm[ccp->out.algorithm]->o.Term)(ccp->out.state); 453 ccp->out.state = NULL; 454 ccp->out.algorithm = -1; 455 } 456 ccp->his_reject = ccp->my_reject = 0; 457 458 while (ccp->out.opt) { 459 next = ccp->out.opt->next; 460 free(ccp->out.opt); 461 ccp->out.opt = next; 462 } 463 ccp_Setup(ccp); 464 } 465 466 static void 467 CcpLayerFinish(struct fsm *fp) 468 { 469 /* We're now down */ 470 struct ccp *ccp = fsm2ccp(fp); 471 struct ccp_opt *next; 472 473 log_Printf(LogCCP, "%s: LayerFinish.\n", fp->link->name); 474 475 /* 476 * Nuke options that may be left over from sending a REQ but never 477 * coming up. 478 */ 479 while (ccp->out.opt) { 480 next = ccp->out.opt->next; 481 free(ccp->out.opt); 482 ccp->out.opt = next; 483 } 484 485 if (ccp_Required(ccp)) { 486 if (fp->link->lcp.fsm.state == ST_OPENED) 487 log_Printf(LogLCP, "%s: Closing due to CCP completion\n", fp->link->name); 488 fsm_Close(&fp->link->lcp.fsm); 489 } 490 } 491 492 /* Called when CCP has reached the OPEN state */ 493 static int 494 CcpLayerUp(struct fsm *fp) 495 { 496 /* We're now up */ 497 struct ccp *ccp = fsm2ccp(fp); 498 struct ccp_opt **o; 499 int f, fail; 500 501 for (f = fail = 0; f < NALGORITHMS; f++) 502 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) && 503 (*algorithm[f]->Required)(&ccp->fsm) && 504 (ccp->in.algorithm != f || ccp->out.algorithm != f)) { 505 /* Blow it all away - we haven't negotiated a required algorithm */ 506 log_Printf(LogWARN, "%s: Failed to negotiate (required) %s\n", 507 fp->link->name, protoname(algorithm[f]->id)); 508 fail = 1; 509 } 510 511 if (fail) { 512 ccp->his_proto = ccp->my_proto = -1; 513 fsm_Close(fp); 514 fsm_Close(&fp->link->lcp.fsm); 515 return 0; 516 } 517 518 log_Printf(LogCCP, "%s: LayerUp.\n", fp->link->name); 519 520 if (ccp->in.state == NULL && ccp->in.algorithm >= 0 && 521 ccp->in.algorithm < NALGORITHMS) { 522 ccp->in.state = (*algorithm[ccp->in.algorithm]->i.Init) 523 (fp->bundle, &ccp->in.opt); 524 if (ccp->in.state == NULL) { 525 log_Printf(LogERROR, "%s: %s (in) initialisation failure\n", 526 fp->link->name, protoname(ccp->his_proto)); 527 ccp->his_proto = ccp->my_proto = -1; 528 fsm_Close(fp); 529 return 0; 530 } 531 } 532 533 o = &ccp->out.opt; 534 for (f = 0; f < ccp->out.algorithm; f++) 535 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg])) 536 o = &(*o)->next; 537 538 if (ccp->out.state == NULL && ccp->out.algorithm >= 0 && 539 ccp->out.algorithm < NALGORITHMS) { 540 ccp->out.state = (*algorithm[ccp->out.algorithm]->o.Init) 541 (fp->bundle, &(*o)->val); 542 if (ccp->out.state == NULL) { 543 log_Printf(LogERROR, "%s: %s (out) initialisation failure\n", 544 fp->link->name, protoname(ccp->my_proto)); 545 ccp->his_proto = ccp->my_proto = -1; 546 fsm_Close(fp); 547 return 0; 548 } 549 } 550 551 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3; 552 553 log_Printf(LogCCP, "%s: Out = %s[%d], In = %s[%d]\n", 554 fp->link->name, protoname(ccp->my_proto), ccp->my_proto, 555 protoname(ccp->his_proto), ccp->his_proto); 556 557 return 1; 558 } 559 560 static void 561 CcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 562 struct fsm_decode *dec) 563 { 564 /* Deal with incoming data */ 565 struct ccp *ccp = fsm2ccp(fp); 566 int f; 567 const char *disp; 568 struct fsm_opt *opt; 569 570 if (mode_type == MODE_REQ) 571 ccp->in.algorithm = -1; /* In case we've received two REQs in a row */ 572 573 while (end - cp >= sizeof(opt->hdr)) { 574 if ((opt = fsm_readopt(&cp)) == NULL) 575 break; 576 577 for (f = NALGORITHMS-1; f > -1; f--) 578 if (algorithm[f]->id == opt->hdr.id) 579 break; 580 581 disp = f == -1 ? "" : (*algorithm[f]->Disp)(opt); 582 if (disp == NULL) 583 disp = ""; 584 585 log_Printf(LogCCP, " %s[%d] %s\n", protoname(opt->hdr.id), 586 opt->hdr.len, disp); 587 588 if (f == -1) { 589 /* Don't understand that :-( */ 590 if (mode_type == MODE_REQ) { 591 ccp->my_reject |= (1 << opt->hdr.id); 592 fsm_rej(dec, opt); 593 } 594 } else { 595 struct ccp_opt *o; 596 597 switch (mode_type) { 598 case MODE_REQ: 599 if (IsAccepted(ccp->cfg.neg[algorithm[f]->Neg]) && 600 (*algorithm[f]->Usable)(fp) && 601 ccp->in.algorithm == -1) { 602 memcpy(&ccp->in.opt, opt, opt->hdr.len); 603 switch ((*algorithm[f]->i.Set)(fp->bundle, &ccp->in.opt, &ccp->cfg)) { 604 case MODE_REJ: 605 fsm_rej(dec, &ccp->in.opt); 606 break; 607 case MODE_NAK: 608 fsm_nak(dec, &ccp->in.opt); 609 break; 610 case MODE_ACK: 611 fsm_ack(dec, &ccp->in.opt); 612 ccp->his_proto = opt->hdr.id; 613 ccp->in.algorithm = f; /* This one'll do :-) */ 614 break; 615 } 616 } else { 617 fsm_rej(dec, opt); 618 } 619 break; 620 case MODE_NAK: 621 for (o = ccp->out.opt; o != NULL; o = o->next) 622 if (o->val.hdr.id == opt->hdr.id) 623 break; 624 if (o == NULL) 625 log_Printf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent" 626 " option\n", fp->link->name); 627 else { 628 memcpy(&o->val, opt, opt->hdr.len); 629 if ((*algorithm[f]->o.Set)(fp->bundle, &o->val, &ccp->cfg) == 630 MODE_ACK) 631 ccp->my_proto = algorithm[f]->id; 632 else { 633 ccp->his_reject |= (1 << opt->hdr.id); 634 ccp->my_proto = -1; 635 if (algorithm[f]->Required(fp)) { 636 log_Printf(LogWARN, "%s: Cannot understand peers (required)" 637 " %s negotiation\n", fp->link->name, 638 protoname(algorithm[f]->id)); 639 fsm_Close(&fp->link->lcp.fsm); 640 } 641 } 642 } 643 break; 644 case MODE_REJ: 645 ccp->his_reject |= (1 << opt->hdr.id); 646 ccp->my_proto = -1; 647 if (algorithm[f]->Required(fp)) { 648 log_Printf(LogWARN, "%s: Peer rejected (required) %s negotiation\n", 649 fp->link->name, protoname(algorithm[f]->id)); 650 fsm_Close(&fp->link->lcp.fsm); 651 } 652 break; 653 } 654 } 655 } 656 657 if (mode_type != MODE_NOP) { 658 fsm_opt_normalise(dec); 659 if (dec->rejend != dec->rej || dec->nakend != dec->nak) { 660 if (ccp->in.state == NULL) { 661 ccp->his_proto = -1; 662 ccp->in.algorithm = -1; 663 } 664 } 665 } 666 } 667 668 extern struct mbuf * 669 ccp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 670 { 671 /* Got PROTO_CCP from link */ 672 m_settype(bp, MB_CCPIN); 673 if (bundle_Phase(bundle) == PHASE_NETWORK) 674 fsm_Input(&l->ccp.fsm, bp); 675 else { 676 if (bundle_Phase(bundle) < PHASE_NETWORK) 677 log_Printf(LogCCP, "%s: Error: Unexpected CCP in phase %s (ignored)\n", 678 l->ccp.fsm.link->name, bundle_PhaseName(bundle)); 679 m_freem(bp); 680 } 681 return NULL; 682 } 683 684 static void 685 CcpRecvResetAck(struct fsm *fp, u_char id) 686 { 687 /* Got a reset ACK, reset incoming dictionary */ 688 struct ccp *ccp = fsm2ccp(fp); 689 690 if (ccp->reset_sent != -1) { 691 if (id != ccp->reset_sent) { 692 log_Printf(LogCCP, "%s: Incorrect ResetAck (id %d, not %d)" 693 " ignored\n", fp->link->name, id, ccp->reset_sent); 694 return; 695 } 696 /* Whaddaya know - a correct reset ack */ 697 } else if (id == ccp->last_reset) 698 log_Printf(LogCCP, "%s: Duplicate ResetAck (resetting again)\n", 699 fp->link->name); 700 else { 701 log_Printf(LogCCP, "%s: Unexpected ResetAck (id %d) ignored\n", 702 fp->link->name, id); 703 return; 704 } 705 706 ccp->last_reset = ccp->reset_sent; 707 ccp->reset_sent = -1; 708 if (ccp->in.state != NULL) 709 (*algorithm[ccp->in.algorithm]->i.Reset)(ccp->in.state); 710 } 711 712 static struct mbuf * 713 ccp_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp, 714 int pri, u_short *proto) 715 { 716 if (PROTO_COMPRESSIBLE(*proto)) { 717 if (l->ccp.fsm.state != ST_OPENED) { 718 if (ccp_Required(&l->ccp)) { 719 /* The NCP layer shouldn't have let this happen ! */ 720 log_Printf(LogERROR, "%s: Unexpected attempt to use an unopened and" 721 " required CCP layer\n", l->name); 722 m_freem(bp); 723 bp = NULL; 724 } 725 } else if (l->ccp.out.state != NULL) { 726 bp = (*algorithm[l->ccp.out.algorithm]->o.Write) 727 (l->ccp.out.state, &l->ccp, l, pri, proto, bp); 728 switch (*proto) { 729 case PROTO_ICOMPD: 730 m_settype(bp, MB_ICOMPDOUT); 731 break; 732 case PROTO_COMPD: 733 m_settype(bp, MB_COMPDOUT); 734 break; 735 } 736 } 737 } 738 739 return bp; 740 } 741 742 static struct mbuf * 743 ccp_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto) 744 { 745 /* 746 * If proto isn't PROTO_[I]COMPD, we still want to pass it to the 747 * decompression routines so that the dictionary's updated 748 */ 749 if (l->ccp.fsm.state == ST_OPENED) { 750 if (*proto == PROTO_COMPD || *proto == PROTO_ICOMPD) { 751 /* Decompress incoming data */ 752 if (l->ccp.reset_sent != -1) 753 /* Send another REQ and put the packet in the bit bucket */ 754 fsm_Output(&l->ccp.fsm, CODE_RESETREQ, l->ccp.reset_sent, NULL, 0, 755 MB_CCPOUT); 756 else if (l->ccp.in.state != NULL) { 757 bp = (*algorithm[l->ccp.in.algorithm]->i.Read) 758 (l->ccp.in.state, &l->ccp, proto, bp); 759 switch (*proto) { 760 case PROTO_ICOMPD: 761 m_settype(bp, MB_ICOMPDIN); 762 break; 763 case PROTO_COMPD: 764 m_settype(bp, MB_COMPDIN); 765 break; 766 } 767 return bp; 768 } 769 m_freem(bp); 770 bp = NULL; 771 } else if (PROTO_COMPRESSIBLE(*proto) && l->ccp.in.state != NULL) { 772 /* Add incoming Network Layer traffic to our dictionary */ 773 (*algorithm[l->ccp.in.algorithm]->i.DictSetup) 774 (l->ccp.in.state, &l->ccp, *proto, bp); 775 } 776 } 777 778 return bp; 779 } 780 781 u_short 782 ccp_Proto(struct ccp *ccp) 783 { 784 return !link2physical(ccp->fsm.link) || !ccp->fsm.bundle->ncp.mp.active ? 785 PROTO_COMPD : PROTO_ICOMPD; 786 } 787 788 int 789 ccp_SetOpenMode(struct ccp *ccp) 790 { 791 int f; 792 793 for (f = 0; f < CCP_NEG_TOTAL; f++) 794 if (IsEnabled(ccp->cfg.neg[f])) { 795 ccp->fsm.open_mode = 0; 796 return 1; 797 } 798 799 ccp->fsm.open_mode = OPEN_PASSIVE; /* Go straight to ST_STOPPED ? */ 800 801 for (f = 0; f < CCP_NEG_TOTAL; f++) 802 if (IsAccepted(ccp->cfg.neg[f])) 803 return 1; 804 805 return 0; /* No CCP at all */ 806 } 807 808 int 809 ccp_DefaultUsable(struct fsm *fp) 810 { 811 return 1; 812 } 813 814 int 815 ccp_DefaultRequired(struct fsm *fp) 816 { 817 return 0; 818 } 819 820 struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull }; 821