1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian (at) Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o (at) 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 1.78.26.1 2010/12/21 17:10:29 kensmith 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 <stdarg.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> /* memcpy() on some archs */ 42 #include <termios.h> 43 44 #include "layer.h" 45 #include "defs.h" 46 #include "command.h" 47 #include "mbuf.h" 48 #include "log.h" 49 #include "timer.h" 50 #include "fsm.h" 51 #include "proto.h" 52 #include "pred.h" 53 #include "deflate.h" 54 #include "throughput.h" 55 #include "iplist.h" 56 #include "slcompress.h" 57 #include "lqr.h" 58 #include "hdlc.h" 59 #include "lcp.h" 60 #include "ccp.h" 61 #include "ncpaddr.h" 62 #include "ipcp.h" 63 #include "filter.h" 64 #include "descriptor.h" 65 #include "prompt.h" 66 #include "link.h" 67 #include "mp.h" 68 #include "async.h" 69 #include "physical.h" 70 #ifndef NORADIUS 71 #include "radius.h" 72 #endif 73 #ifndef NODES 74 #include "mppe.h" 75 #endif 76 #include "ipv6cp.h" 77 #include "ncp.h" 78 #include "bundle.h" 79 80 static void CcpSendConfigReq(struct fsm *); 81 static void CcpSentTerminateReq(struct fsm *); 82 static void CcpSendTerminateAck(struct fsm *, u_char); 83 static void CcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 84 struct fsm_decode *); 85 static void CcpLayerStart(struct fsm *); 86 static void CcpLayerFinish(struct fsm *); 87 static int CcpLayerUp(struct fsm *); 88 static void CcpLayerDown(struct fsm *); 89 static void CcpInitRestartCounter(struct fsm *, int); 90 static int CcpRecvResetReq(struct fsm *); 91 static void CcpRecvResetAck(struct fsm *, u_char); 92 93 static struct fsm_callbacks ccp_Callbacks = { 94 CcpLayerUp, 95 CcpLayerDown, 96 CcpLayerStart, 97 CcpLayerFinish, 98 CcpInitRestartCounter, 99 CcpSendConfigReq, 100 CcpSentTerminateReq, 101 CcpSendTerminateAck, 102 CcpDecodeConfig, 103 CcpRecvResetReq, 104 CcpRecvResetAck 105 }; 106 107 static const char * const ccp_TimerNames[] = 108 {"CCP restart", "CCP openmode", "CCP stopped"}; 109 110 static const char * 111 protoname(int proto) 112 { 113 static char const * const cftypes[] = { 114 /* Check out the latest ``Compression Control Protocol'' rfc (1962) */ 115 "OUI", /* 0: OUI */ 116 "PRED1", /* 1: Predictor type 1 */ 117 "PRED2", /* 2: Predictor type 2 */ 118 "PUDDLE", /* 3: Puddle Jumber */ 119 NULL, NULL, NULL, NULL, NULL, NULL, 120 NULL, NULL, NULL, NULL, NULL, NULL, 121 "HWPPC", /* 16: Hewlett-Packard PPC */ 122 "STAC", /* 17: Stac Electronics LZS (rfc1974) */ 123 "MPPE", /* 18: Microsoft PPC (rfc2118) and */ 124 /* Microsoft PPE (draft-ietf-pppext-mppe) */ 125 "GAND", /* 19: Gandalf FZA (rfc1993) */ 126 "V42BIS", /* 20: ARG->DATA.42bis compression */ 127 "BSD", /* 21: BSD LZW Compress */ 128 NULL, 129 "LZS-DCP", /* 23: LZS-DCP Compression Protocol (rfc1967) */ 130 "MAGNALINK/DEFLATE",/* 24: Magnalink Variable Resource (rfc1975) */ 131 /* 24: Deflate (according to pppd-2.3.*) */ 132 "DCE", /* 25: Data Circuit-Terminating Equip (rfc1976) */ 133 "DEFLATE", /* 26: Deflate (rfc1979) */ 134 }; 135 136 if (proto < 0 || (unsigned)proto > sizeof cftypes / sizeof *cftypes || 137 cftypes[proto] == NULL) { 138 if (proto == -1) 139 return "none"; 140 return HexStr(proto, NULL, 0); 141 } 142 143 return cftypes[proto]; 144 } 145 146 /* We support these algorithms, and Req them in the given order */ 147 static const struct ccp_algorithm * const algorithm[] = { 148 &DeflateAlgorithm, 149 &Pred1Algorithm, 150 &PppdDeflateAlgorithm 151 #ifndef NODES 152 , &MPPEAlgorithm 153 #endif 154 }; 155 156 #define NALGORITHMS (sizeof algorithm/sizeof algorithm[0]) 157 158 int 159 ccp_ReportStatus(struct cmdargs const *arg) 160 { 161 struct ccp_opt **o; 162 struct link *l; 163 struct ccp *ccp; 164 int f; 165 166 l = command_ChooseLink(arg); 167 ccp = &l->ccp; 168 169 prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, ccp->fsm.name, 170 State2Nam(ccp->fsm.state)); 171 if (ccp->fsm.state == ST_OPENED) { 172 prompt_Printf(arg->prompt, " My protocol = %s, His protocol = %s\n", 173 protoname(ccp->my_proto), protoname(ccp->his_proto)); 174 prompt_Printf(arg->prompt, " Output: %ld --> %ld, Input: %ld --> %ld\n", 175 ccp->uncompout, ccp->compout, 176 ccp->compin, ccp->uncompin); 177 } 178 179 if (ccp->in.algorithm != -1) 180 prompt_Printf(arg->prompt, "\n Input Options: %s\n", 181 (*algorithm[ccp->in.algorithm]->Disp)(&ccp->in.opt)); 182 183 if (ccp->out.algorithm != -1) { 184 o = &ccp->out.opt; 185 for (f = 0; f < ccp->out.algorithm; f++) 186 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg])) 187 o = &(*o)->next; 188 prompt_Printf(arg->prompt, " Output Options: %s\n", 189 (*algorithm[ccp->out.algorithm]->Disp)(&(*o)->val)); 190 } 191 192 prompt_Printf(arg->prompt, "\n Defaults: "); 193 prompt_Printf(arg->prompt, "FSM retry = %us, max %u Config" 194 " REQ%s, %u Term REQ%s\n", ccp->cfg.fsm.timeout, 195 ccp->cfg.fsm.maxreq, ccp->cfg.fsm.maxreq == 1 ? "" : "s", 196 ccp->cfg.fsm.maxtrm, ccp->cfg.fsm.maxtrm == 1 ? "" : "s"); 197 prompt_Printf(arg->prompt, " deflate windows: "); 198 prompt_Printf(arg->prompt, "incoming = %d, ", ccp->cfg.deflate.in.winsize); 199 prompt_Printf(arg->prompt, "outgoing = %d\n", ccp->cfg.deflate.out.winsize); 200 #ifndef NODES 201 prompt_Printf(arg->prompt, " MPPE: "); 202 if (ccp->cfg.mppe.keybits) 203 prompt_Printf(arg->prompt, "%d bits, ", ccp->cfg.mppe.keybits); 204 else 205 prompt_Printf(arg->prompt, "any bits, "); 206 switch (ccp->cfg.mppe.state) { 207 case MPPE_STATEFUL: 208 prompt_Printf(arg->prompt, "stateful"); 209 break; 210 case MPPE_STATELESS: 211 prompt_Printf(arg->prompt, "stateless"); 212 break; 213 case MPPE_ANYSTATE: 214 prompt_Printf(arg->prompt, "any state"); 215 break; 216 } 217 prompt_Printf(arg->prompt, "%s\n", 218 ccp->cfg.mppe.required ? ", required" : ""); 219 #endif 220 221 prompt_Printf(arg->prompt, "\n DEFLATE: %s\n", 222 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE])); 223 prompt_Printf(arg->prompt, " PREDICTOR1: %s\n", 224 command_ShowNegval(ccp->cfg.neg[CCP_NEG_PRED1])); 225 prompt_Printf(arg->prompt, " DEFLATE24: %s\n", 226 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE24])); 227 #ifndef NODES 228 prompt_Printf(arg->prompt, " MPPE: %s\n", 229 command_ShowNegval(ccp->cfg.neg[CCP_NEG_MPPE])); 230 #endif 231 return 0; 232 } 233 234 void 235 ccp_SetupCallbacks(struct ccp *ccp) 236 { 237 ccp->fsm.fn = &ccp_Callbacks; 238 ccp->fsm.FsmTimer.name = ccp_TimerNames[0]; 239 ccp->fsm.OpenTimer.name = ccp_TimerNames[1]; 240 ccp->fsm.StoppedTimer.name = ccp_TimerNames[2]; 241 } 242 243 void 244 ccp_Init(struct ccp *ccp, struct bundle *bundle, struct link *l, 245 const struct fsm_parent *parent) 246 { 247 /* Initialise ourselves */ 248 249 fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, LogCCP, 250 bundle, l, parent, &ccp_Callbacks, ccp_TimerNames); 251 252 ccp->cfg.deflate.in.winsize = 0; 253 ccp->cfg.deflate.out.winsize = 15; 254 ccp->cfg.fsm.timeout = DEF_FSMRETRY; 255 ccp->cfg.fsm.maxreq = DEF_FSMTRIES; 256 ccp->cfg.fsm.maxtrm = DEF_FSMTRIES; 257 ccp->cfg.neg[CCP_NEG_DEFLATE] = NEG_ENABLED|NEG_ACCEPTED; 258 ccp->cfg.neg[CCP_NEG_PRED1] = NEG_ENABLED|NEG_ACCEPTED; 259 ccp->cfg.neg[CCP_NEG_DEFLATE24] = 0; 260 #ifndef NODES 261 ccp->cfg.mppe.keybits = 0; 262 ccp->cfg.mppe.state = MPPE_ANYSTATE; 263 ccp->cfg.mppe.required = 0; 264 ccp->cfg.neg[CCP_NEG_MPPE] = NEG_ENABLED|NEG_ACCEPTED; 265 #endif 266 267 ccp_Setup(ccp); 268 } 269 270 void 271 ccp_Setup(struct ccp *ccp) 272 { 273 /* Set ourselves up for a startup */ 274 ccp->fsm.open_mode = 0; 275 ccp->his_proto = ccp->my_proto = -1; 276 ccp->reset_sent = ccp->last_reset = -1; 277 ccp->in.algorithm = ccp->out.algorithm = -1; 278 ccp->in.state = ccp->out.state = NULL; 279 ccp->in.opt.hdr.id = -1; 280 ccp->out.opt = NULL; 281 ccp->his_reject = ccp->my_reject = 0; 282 ccp->uncompout = ccp->compout = 0; 283 ccp->uncompin = ccp->compin = 0; 284 } 285 286 /* 287 * Is ccp *REQUIRED* ? 288 * We ask each of the configured ccp protocols if they're required and 289 * return TRUE if they are. 290 * 291 * It's not possible for the peer to reject a required ccp protocol 292 * without our state machine bringing the supporting lcp layer down. 293 * 294 * If ccp is required but not open, the NCP layer should not push 295 * any data into the link. 296 */ 297 int 298 ccp_Required(struct ccp *ccp) 299 { 300 unsigned f; 301 302 for (f = 0; f < NALGORITHMS; f++) 303 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) && 304 (*algorithm[f]->Required)(&ccp->fsm)) 305 return 1; 306 307 return 0; 308 } 309 310 /* 311 * Report whether it's possible to increase a packet's size after 312 * compression (and by how much). 313 */ 314 int 315 ccp_MTUOverhead(struct ccp *ccp) 316 { 317 if (ccp->fsm.state == ST_OPENED && ccp->out.algorithm >= 0) 318 return algorithm[ccp->out.algorithm]->o.MTUOverhead; 319 320 return 0; 321 } 322 323 static void 324 CcpInitRestartCounter(struct fsm *fp, int what) 325 { 326 /* Set fsm timer load */ 327 struct ccp *ccp = fsm2ccp(fp); 328 329 fp->FsmTimer.load = ccp->cfg.fsm.timeout * SECTICKS; 330 switch (what) { 331 case FSM_REQ_TIMER: 332 fp->restart = ccp->cfg.fsm.maxreq; 333 break; 334 case FSM_TRM_TIMER: 335 fp->restart = ccp->cfg.fsm.maxtrm; 336 break; 337 default: 338 fp->restart = 1; 339 break; 340 } 341 } 342 343 static void 344 CcpSendConfigReq(struct fsm *fp) 345 { 346 /* Send config REQ please */ 347 struct ccp *ccp = fsm2ccp(fp); 348 struct ccp_opt **o; 349 u_char *cp, buff[100]; 350 unsigned f; 351 int 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 == (int)f) 366 break; 367 368 if (alloc || *o == NULL) { 369 if ((*o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt))) == NULL) { 370 log_Printf(LogERROR, "%s: Not enough memory for CCP REQ !\n", 371 fp->link->name); 372 break; 373 } 374 (*o)->val.hdr.id = algorithm[f]->id; 375 (*o)->val.hdr.len = 2; 376 (*o)->next = NULL; 377 (*o)->algorithm = f; 378 (*algorithm[f]->o.OptInit)(fp->bundle, &(*o)->val, &ccp->cfg); 379 } 380 381 if (cp + (*o)->val.hdr.len > buff + sizeof buff) { 382 log_Printf(LogERROR, "%s: CCP REQ buffer overrun !\n", fp->link->name); 383 break; 384 } 385 memcpy(cp, &(*o)->val, (*o)->val.hdr.len); 386 cp += (*o)->val.hdr.len; 387 388 ccp->my_proto = (*o)->val.hdr.id; 389 ccp->out.algorithm = f; 390 391 if (alloc) 392 o = &(*o)->next; 393 } 394 395 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff, MB_CCPOUT); 396 } 397 398 void 399 ccp_SendResetReq(struct fsm *fp) 400 { 401 /* We can't read our input - ask peer to reset */ 402 struct ccp *ccp = fsm2ccp(fp); 403 404 ccp->reset_sent = fp->reqid; 405 ccp->last_reset = -1; 406 fsm_Output(fp, CODE_RESETREQ, fp->reqid, NULL, 0, MB_CCPOUT); 407 } 408 409 static void 410 CcpSentTerminateReq(struct fsm *fp __unused) 411 { 412 /* Term REQ just sent by FSM */ 413 } 414 415 static void 416 CcpSendTerminateAck(struct fsm *fp, u_char id) 417 { 418 /* Send Term ACK please */ 419 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_CCPOUT); 420 } 421 422 static int 423 CcpRecvResetReq(struct fsm *fp) 424 { 425 /* Got a reset REQ, reset outgoing dictionary */ 426 struct ccp *ccp = fsm2ccp(fp); 427 if (ccp->out.state == NULL) 428 return 1; 429 return (*algorithm[ccp->out.algorithm]->o.Reset)(ccp->out.state); 430 } 431 432 static void 433 CcpLayerStart(struct fsm *fp) 434 { 435 /* We're about to start up ! */ 436 struct ccp *ccp = fsm2ccp(fp); 437 438 log_Printf(LogCCP, "%s: LayerStart.\n", fp->link->name); 439 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3; 440 } 441 442 static void 443 CcpLayerDown(struct fsm *fp) 444 { 445 /* About to come down */ 446 struct ccp *ccp = fsm2ccp(fp); 447 struct ccp_opt *next; 448 449 log_Printf(LogCCP, "%s: LayerDown.\n", fp->link->name); 450 if (ccp->in.state != NULL) { 451 (*algorithm[ccp->in.algorithm]->i.Term)(ccp->in.state); 452 ccp->in.state = NULL; 453 ccp->in.algorithm = -1; 454 } 455 if (ccp->out.state != NULL) { 456 (*algorithm[ccp->out.algorithm]->o.Term)(ccp->out.state); 457 ccp->out.state = NULL; 458 ccp->out.algorithm = -1; 459 } 460 ccp->his_reject = ccp->my_reject = 0; 461 462 while (ccp->out.opt) { 463 next = ccp->out.opt->next; 464 free(ccp->out.opt); 465 ccp->out.opt = next; 466 } 467 ccp_Setup(ccp); 468 } 469 470 static void 471 CcpLayerFinish(struct fsm *fp) 472 { 473 /* We're now down */ 474 struct ccp *ccp = fsm2ccp(fp); 475 struct ccp_opt *next; 476 477 log_Printf(LogCCP, "%s: LayerFinish.\n", fp->link->name); 478 479 /* 480 * Nuke options that may be left over from sending a REQ but never 481 * coming up. 482 */ 483 while (ccp->out.opt) { 484 next = ccp->out.opt->next; 485 free(ccp->out.opt); 486 ccp->out.opt = next; 487 } 488 489 if (ccp_Required(ccp)) { 490 if (fp->link->lcp.fsm.state == ST_OPENED) 491 log_Printf(LogLCP, "%s: Closing due to CCP completion\n", fp->link->name); 492 fsm_Close(&fp->link->lcp.fsm); 493 } 494 } 495 496 /* Called when CCP has reached the OPEN state */ 497 static int 498 CcpLayerUp(struct fsm *fp) 499 { 500 /* We're now up */ 501 struct ccp *ccp = fsm2ccp(fp); 502 struct ccp_opt **o; 503 unsigned f, fail; 504 505 for (f = fail = 0; f < NALGORITHMS; f++) 506 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) && 507 (*algorithm[f]->Required)(&ccp->fsm) && 508 (ccp->in.algorithm != (int)f || ccp->out.algorithm != (int)f)) { 509 /* Blow it all away - we haven't negotiated a required algorithm */ 510 log_Printf(LogWARN, "%s: Failed to negotiate (required) %s\n", 511 fp->link->name, protoname(algorithm[f]->id)); 512 fail = 1; 513 } 514 515 if (fail) { 516 ccp->his_proto = ccp->my_proto = -1; 517 fsm_Close(fp); 518 fsm_Close(&fp->link->lcp.fsm); 519 return 0; 520 } 521 522 log_Printf(LogCCP, "%s: LayerUp.\n", fp->link->name); 523 524 if (ccp->in.state == NULL && ccp->in.algorithm >= 0 && 525 ccp->in.algorithm < (int)NALGORITHMS) { 526 ccp->in.state = (*algorithm[ccp->in.algorithm]->i.Init) 527 (fp->bundle, &ccp->in.opt); 528 if (ccp->in.state == NULL) { 529 log_Printf(LogERROR, "%s: %s (in) initialisation failure\n", 530 fp->link->name, protoname(ccp->his_proto)); 531 ccp->his_proto = ccp->my_proto = -1; 532 fsm_Close(fp); 533 return 0; 534 } 535 } 536 537 o = &ccp->out.opt; 538 if (ccp->out.algorithm > 0) 539 for (f = 0; f < (unsigned)ccp->out.algorithm; f++) 540 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg])) 541 o = &(*o)->next; 542 543 if (ccp->out.state == NULL && ccp->out.algorithm >= 0 && 544 ccp->out.algorithm < (int)NALGORITHMS) { 545 ccp->out.state = (*algorithm[ccp->out.algorithm]->o.Init) 546 (fp->bundle, &(*o)->val); 547 if (ccp->out.state == NULL) { 548 log_Printf(LogERROR, "%s: %s (out) initialisation failure\n", 549 fp->link->name, protoname(ccp->my_proto)); 550 ccp->his_proto = ccp->my_proto = -1; 551 fsm_Close(fp); 552 return 0; 553 } 554 } 555 556 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3; 557 558 log_Printf(LogCCP, "%s: Out = %s[%d], In = %s[%d]\n", 559 fp->link->name, protoname(ccp->my_proto), ccp->my_proto, 560 protoname(ccp->his_proto), ccp->his_proto); 561 562 return 1; 563 } 564 565 static void 566 CcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 567 struct fsm_decode *dec) 568 { 569 /* Deal with incoming data */ 570 struct ccp *ccp = fsm2ccp(fp); 571 int f; 572 const char *disp; 573 struct fsm_opt *opt; 574 575 if (mode_type == MODE_REQ) 576 ccp->in.algorithm = -1; /* In case we've received two REQs in a row */ 577 578 while (end >= cp + sizeof(opt->hdr)) { 579 if ((opt = fsm_readopt(&cp)) == NULL) 580 break; 581 582 for (f = NALGORITHMS-1; f > -1; f--) 583 if (algorithm[f]->id == opt->hdr.id) 584 break; 585 586 disp = f == -1 ? "" : (*algorithm[f]->Disp)(opt); 587 if (disp == NULL) 588 disp = ""; 589 590 log_Printf(LogCCP, " %s[%d] %s\n", protoname(opt->hdr.id), 591 opt->hdr.len, disp); 592 593 if (f == -1) { 594 /* Don't understand that :-( */ 595 if (mode_type == MODE_REQ) { 596 ccp->my_reject |= (1 << opt->hdr.id); 597 fsm_rej(dec, opt); 598 } 599 } else { 600 struct ccp_opt *o; 601 602 switch (mode_type) { 603 case MODE_REQ: 604 if (IsAccepted(ccp->cfg.neg[algorithm[f]->Neg]) && 605 (*algorithm[f]->Usable)(fp) && 606 ccp->in.algorithm == -1) { 607 memcpy(&ccp->in.opt, opt, opt->hdr.len); 608 switch ((*algorithm[f]->i.Set)(fp->bundle, &ccp->in.opt, &ccp->cfg)) { 609 case MODE_REJ: 610 fsm_rej(dec, &ccp->in.opt); 611 break; 612 case MODE_NAK: 613 fsm_nak(dec, &ccp->in.opt); 614 break; 615 case MODE_ACK: 616 fsm_ack(dec, &ccp->in.opt); 617 ccp->his_proto = opt->hdr.id; 618 ccp->in.algorithm = (int)f; /* This one'll do :-) */ 619 break; 620 } 621 } else { 622 fsm_rej(dec, opt); 623 } 624 break; 625 case MODE_NAK: 626 for (o = ccp->out.opt; o != NULL; o = o->next) 627 if (o->val.hdr.id == opt->hdr.id) 628 break; 629 if (o == NULL) 630 log_Printf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent" 631 " option\n", fp->link->name); 632 else { 633 memcpy(&o->val, opt, opt->hdr.len); 634 if ((*algorithm[f]->o.Set)(fp->bundle, &o->val, &ccp->cfg) == 635 MODE_ACK) 636 ccp->my_proto = algorithm[f]->id; 637 else { 638 ccp->his_reject |= (1 << opt->hdr.id); 639 ccp->my_proto = -1; 640 if (algorithm[f]->Required(fp)) { 641 log_Printf(LogWARN, "%s: Cannot understand peers (required)" 642 " %s negotiation\n", fp->link->name, 643 protoname(algorithm[f]->id)); 644 fsm_Close(&fp->link->lcp.fsm); 645 } 646 } 647 } 648 break; 649 case MODE_REJ: 650 ccp->his_reject |= (1 << opt->hdr.id); 651 ccp->my_proto = -1; 652 if (algorithm[f]->Required(fp)) { 653 log_Printf(LogWARN, "%s: Peer rejected (required) %s negotiation\n", 654 fp->link->name, protoname(algorithm[f]->id)); 655 fsm_Close(&fp->link->lcp.fsm); 656 } 657 break; 658 } 659 } 660 } 661 662 if (mode_type != MODE_NOP) { 663 fsm_opt_normalise(dec); 664 if (dec->rejend != dec->rej || dec->nakend != dec->nak) { 665 if (ccp->in.state == NULL) { 666 ccp->his_proto = -1; 667 ccp->in.algorithm = -1; 668 } 669 } 670 } 671 } 672 673 extern struct mbuf * 674 ccp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 675 { 676 /* Got PROTO_CCP from link */ 677 m_settype(bp, MB_CCPIN); 678 if (bundle_Phase(bundle) == PHASE_NETWORK) 679 fsm_Input(&l->ccp.fsm, bp); 680 else { 681 if (bundle_Phase(bundle) < PHASE_NETWORK) 682 log_Printf(LogCCP, "%s: Error: Unexpected CCP in phase %s (ignored)\n", 683 l->ccp.fsm.link->name, bundle_PhaseName(bundle)); 684 m_freem(bp); 685 } 686 return NULL; 687 } 688 689 static void 690 CcpRecvResetAck(struct fsm *fp, u_char id) 691 { 692 /* Got a reset ACK, reset incoming dictionary */ 693 struct ccp *ccp = fsm2ccp(fp); 694 695 if (ccp->reset_sent != -1) { 696 if (id != ccp->reset_sent) { 697 log_Printf(LogCCP, "%s: Incorrect ResetAck (id %d, not %d)" 698 " ignored\n", fp->link->name, id, ccp->reset_sent); 699 return; 700 } 701 /* Whaddaya know - a correct reset ack */ 702 } else if (id == ccp->last_reset) 703 log_Printf(LogCCP, "%s: Duplicate ResetAck (resetting again)\n", 704 fp->link->name); 705 else { 706 log_Printf(LogCCP, "%s: Unexpected ResetAck (id %d) ignored\n", 707 fp->link->name, id); 708 return; 709 } 710 711 ccp->last_reset = ccp->reset_sent; 712 ccp->reset_sent = -1; 713 if (ccp->in.state != NULL) 714 (*algorithm[ccp->in.algorithm]->i.Reset)(ccp->in.state); 715 } 716 717 static struct mbuf * 718 ccp_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp, 719 int pri, u_short *proto) 720 { 721 if (PROTO_COMPRESSIBLE(*proto)) { 722 if (l->ccp.fsm.state != ST_OPENED) { 723 if (ccp_Required(&l->ccp)) { 724 /* The NCP layer shouldn't have let this happen ! */ 725 log_Printf(LogERROR, "%s: Unexpected attempt to use an unopened and" 726 " required CCP layer\n", l->name); 727 m_freem(bp); 728 bp = NULL; 729 } 730 } else if (l->ccp.out.state != NULL) { 731 bp = (*algorithm[l->ccp.out.algorithm]->o.Write) 732 (l->ccp.out.state, &l->ccp, l, pri, proto, bp); 733 switch (*proto) { 734 case PROTO_ICOMPD: 735 m_settype(bp, MB_ICOMPDOUT); 736 break; 737 case PROTO_COMPD: 738 m_settype(bp, MB_COMPDOUT); 739 break; 740 } 741 } 742 } 743 744 return bp; 745 } 746 747 static struct mbuf * 748 ccp_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp, 749 u_short *proto) 750 { 751 /* 752 * If proto isn't PROTO_[I]COMPD, we still want to pass it to the 753 * decompression routines so that the dictionary's updated 754 */ 755 if (l->ccp.fsm.state == ST_OPENED) { 756 if (*proto == PROTO_COMPD || *proto == PROTO_ICOMPD) { 757 /* Decompress incoming data */ 758 if (l->ccp.reset_sent != -1) 759 /* Send another REQ and put the packet in the bit bucket */ 760 fsm_Output(&l->ccp.fsm, CODE_RESETREQ, l->ccp.reset_sent, NULL, 0, 761 MB_CCPOUT); 762 else if (l->ccp.in.state != NULL) { 763 bp = (*algorithm[l->ccp.in.algorithm]->i.Read) 764 (l->ccp.in.state, &l->ccp, proto, bp); 765 switch (*proto) { 766 case PROTO_ICOMPD: 767 m_settype(bp, MB_ICOMPDIN); 768 break; 769 case PROTO_COMPD: 770 m_settype(bp, MB_COMPDIN); 771 break; 772 } 773 return bp; 774 } 775 m_freem(bp); 776 bp = NULL; 777 } else if (PROTO_COMPRESSIBLE(*proto) && l->ccp.in.state != NULL) { 778 /* Add incoming Network Layer traffic to our dictionary */ 779 (*algorithm[l->ccp.in.algorithm]->i.DictSetup) 780 (l->ccp.in.state, &l->ccp, *proto, bp); 781 } 782 } 783 784 return bp; 785 } 786 787 u_short 788 ccp_Proto(struct ccp *ccp) 789 { 790 return !link2physical(ccp->fsm.link) || !ccp->fsm.bundle->ncp.mp.active ? 791 PROTO_COMPD : PROTO_ICOMPD; 792 } 793 794 int 795 ccp_SetOpenMode(struct ccp *ccp) 796 { 797 int f; 798 799 for (f = 0; f < CCP_NEG_TOTAL; f++) 800 if (IsEnabled(ccp->cfg.neg[f])) { 801 ccp->fsm.open_mode = 0; 802 return 1; 803 } 804 805 ccp->fsm.open_mode = OPEN_PASSIVE; /* Go straight to ST_STOPPED ? */ 806 807 for (f = 0; f < CCP_NEG_TOTAL; f++) 808 if (IsAccepted(ccp->cfg.neg[f])) 809 return 1; 810 811 return 0; /* No CCP at all */ 812 } 813 814 int 815 ccp_DefaultUsable(struct fsm *fp __unused) 816 { 817 return 1; 818 } 819 820 int 821 ccp_DefaultRequired(struct fsm *fp __unused) 822 { 823 return 0; 824 } 825 826 struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull }; 827
