1/* 2 * ipv6cp.c - PPP IPV6 Control Protocol. 3 * 4 * Copyright (c) 1999 Tommi Komulainen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * 3. The name(s) of the authors of this software must not be used to 19 * endorse or promote products derived from this software without 20 * prior written permission. 21 * 22 * 4. Redistributions of any form whatsoever must retain the following 23 * acknowledgment: 24 * "This product includes software developed by Tommi Komulainen 25 * <Tommi.Komulainen@iki.fi>". 26 * 27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 34 * 35 */ 36 37/* Original version, based on RFC2023 : 38 39 Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt, 40 Alain.Durand@imag.fr, IMAG, 41 Jean-Luc.Richier@imag.fr, IMAG-LSR. 42 43 Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE, 44 Alain.Durand@imag.fr, IMAG, 45 Jean-Luc.Richier@imag.fr, IMAG-LSR. 46 47 Ce travail a �t� fait au sein du GIE DYADE (Groupement d'Int�r�t 48 �conomique ayant pour membres BULL S.A. et l'INRIA). 49 50 Ce logiciel informatique est disponible aux conditions 51 usuelles dans la recherche, c'est-�-dire qu'il peut 52 �tre utilis�, copi�, modifi�, distribu� � l'unique 53 condition que ce texte soit conserv� afin que 54 l'origine de ce logiciel soit reconnue. 55 56 Le nom de l'Institut National de Recherche en Informatique 57 et en Automatique (INRIA), de l'IMAG, ou d'une personne morale 58 ou physique ayant particip� � l'�laboration de ce logiciel ne peut 59 �tre utilis� sans son accord pr�alable explicite. 60 61 Ce logiciel est fourni tel quel sans aucune garantie, 62 support ou responsabilit� d'aucune sorte. 63 Ce logiciel est d�riv� de sources d'origine 64 "University of California at Berkeley" et 65 "Digital Equipment Corporation" couvertes par des copyrights. 66 67 L'Institut d'Informatique et de Math�matiques Appliqu�es de Grenoble (IMAG) 68 est une f�d�ration d'unit�s mixtes de recherche du CNRS, de l'Institut National 69 Polytechnique de Grenoble et de l'Universit� Joseph Fourier regroupant 70 sept laboratoires dont le laboratoire Logiciels, Syst�mes, R�seaux (LSR). 71 72 This work has been done in the context of GIE DYADE (joint R & D venture 73 between BULL S.A. and INRIA). 74 75 This software is available with usual "research" terms 76 with the aim of retain credits of the software. 77 Permission to use, copy, modify and distribute this software for any 78 purpose and without fee is hereby granted, provided that the above 79 copyright notice and this permission notice appear in all copies, 80 and the name of INRIA, IMAG, or any contributor not be used in advertising 81 or publicity pertaining to this material without the prior explicit 82 permission. The software is provided "as is" without any 83 warranties, support or liabilities of any kind. 84 This software is derived from source code from 85 "University of California at Berkeley" and 86 "Digital Equipment Corporation" protected by copyrights. 87 88 Grenoble's Institute of Computer Science and Applied Mathematics (IMAG) 89 is a federation of seven research units funded by the CNRS, National 90 Polytechnic Institute of Grenoble and University Joseph Fourier. 91 The research unit in Software, Systems, Networks (LSR) is member of IMAG. 92*/ 93 94/* 95 * Derived from : 96 * 97 * 98 * ipcp.c - PPP IP Control Protocol. 99 * 100 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 101 * 102 * Redistribution and use in source and binary forms, with or without 103 * modification, are permitted provided that the following conditions 104 * are met: 105 * 106 * 1. Redistributions of source code must retain the above copyright 107 * notice, this list of conditions and the following disclaimer. 108 * 109 * 2. Redistributions in binary form must reproduce the above copyright 110 * notice, this list of conditions and the following disclaimer in 111 * the documentation and/or other materials provided with the 112 * distribution. 113 * 114 * 3. The name "Carnegie Mellon University" must not be used to 115 * endorse or promote products derived from this software without 116 * prior written permission. For permission or any legal 117 * details, please contact 118 * Office of Technology Transfer 119 * Carnegie Mellon University 120 * 5000 Forbes Avenue 121 * Pittsburgh, PA 15213-3890 122 * (412) 268-4387, fax: (412) 268-7395 123 * tech-transfer@andrew.cmu.edu 124 * 125 * 4. Redistributions of any form whatsoever must retain the following 126 * acknowledgment: 127 * "This product includes software developed by Computing Services 128 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 129 * 130 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 131 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 132 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 133 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 134 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 135 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 136 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 137 * 138 * $Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $ 139 */ 140 141#define RCSID "$Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $" 142 143/* 144 * TODO: 145 * 146 * Proxy Neighbour Discovery. 147 * 148 * Better defines for selecting the ordering of 149 * interface up / set address. (currently checks for __linux__, 150 * since SVR4 && (SNI || __USLC__) didn't work properly) 151 */ 152 153#include <stdio.h> 154#include <string.h> 155#include <unistd.h> 156#include <netdb.h> 157#include <sys/param.h> 158#include <sys/types.h> 159#include <sys/socket.h> 160#include <netinet/in.h> 161#include <arpa/inet.h> 162 163#include "pppd.h" 164#include "fsm.h" 165#include "ipcp.h" 166#include "ipv6cp.h" 167#include "magic.h" 168#include "pathnames.h" 169 170static const char rcsid[] = RCSID; 171 172/* global vars */ 173ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */ 174ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ 175ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ 176ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */ 177int no_ifaceid_neg = 0; 178 179/* local vars */ 180static int ipv6cp_is_up; 181 182/* 183 * Callbacks for fsm code. (CI = Configuration Information) 184 */ 185static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */ 186static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */ 187static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ 188static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ 189static int ipv6cp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */ 190static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ 191static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ 192static void ipv6cp_up __P((fsm *)); /* We're UP */ 193static void ipv6cp_down __P((fsm *)); /* We're DOWN */ 194static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */ 195 196fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */ 197 198static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */ 199 ipv6cp_resetci, /* Reset our Configuration Information */ 200 ipv6cp_cilen, /* Length of our Configuration Information */ 201 ipv6cp_addci, /* Add our Configuration Information */ 202 ipv6cp_ackci, /* ACK our Configuration Information */ 203 ipv6cp_nakci, /* NAK our Configuration Information */ 204 ipv6cp_rejci, /* Reject our Configuration Information */ 205 ipv6cp_reqci, /* Request peer's Configuration Information */ 206 ipv6cp_up, /* Called when fsm reaches OPENED state */ 207 ipv6cp_down, /* Called when fsm leaves OPENED state */ 208 NULL, /* Called when we want the lower layer up */ 209 ipv6cp_finished, /* Called when we want the lower layer down */ 210 NULL, /* Called when Protocol-Reject received */ 211 NULL, /* Retransmission is necessary */ 212 NULL, /* Called to handle protocol-specific codes */ 213 "IPV6CP" /* String name of protocol */ 214}; 215 216/* 217 * Command-line options. 218 */ 219static int setifaceid __P((char **arg)); 220static void printifaceid __P((option_t *, 221 void (*)(void *, char *, ...), void *)); 222 223static option_t ipv6cp_option_list[] = { 224 { "ipv6", o_special, (void *)setifaceid, 225 "Set interface identifiers for IPV6", 226 OPT_A2PRINTER, (void *)printifaceid }, 227 228 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag, 229 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 }, 230 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag, 231 "Disable IPv6 and IPv6CP", OPT_PRIOSUB }, 232 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag, 233 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS }, 234 235 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local, 236 "Accept peer's interface identifier for us", 1 }, 237 238 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip, 239 "Use (default) IPv4 address as interface identifier", 1 }, 240 241#if defined(SOL2) || defined(__linux__) 242 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent, 243 "Use uniquely-available persistent value for link local address", 1 }, 244#endif /* defined(SOL2) */ 245 246 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime, 247 "Set timeout for IPv6CP", OPT_PRIO }, 248 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits, 249 "Set max #xmits for term-reqs", OPT_PRIO }, 250 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits, 251 "Set max #xmits for conf-reqs", OPT_PRIO }, 252 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops, 253 "Set max #conf-naks for IPv6CP", OPT_PRIO }, 254 255 { NULL } 256}; 257 258 259/* 260 * Protocol entry points from main code. 261 */ 262static void ipv6cp_init __P((int)); 263static void ipv6cp_open __P((int)); 264static void ipv6cp_close __P((int, char *)); 265static void ipv6cp_lowerup __P((int)); 266static void ipv6cp_lowerdown __P((int)); 267static void ipv6cp_input __P((int, u_char *, int)); 268static void ipv6cp_protrej __P((int)); 269static int ipv6cp_printpkt __P((u_char *, int, 270 void (*) __P((void *, char *, ...)), void *)); 271static void ipv6_check_options __P((void)); 272static int ipv6_demand_conf __P((int)); 273static int ipv6_active_pkt __P((u_char *, int)); 274 275struct protent ipv6cp_protent = { 276 PPP_IPV6CP, 277 ipv6cp_init, 278 ipv6cp_input, 279 ipv6cp_protrej, 280 ipv6cp_lowerup, 281 ipv6cp_lowerdown, 282 ipv6cp_open, 283 ipv6cp_close, 284 ipv6cp_printpkt, 285 NULL, 286 0, 287 "IPV6CP", 288 "IPV6", 289 ipv6cp_option_list, 290 ipv6_check_options, 291 ipv6_demand_conf, 292 ipv6_active_pkt 293}; 294 295static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t)); 296static void ipv6cp_script __P((char *)); 297static void ipv6cp_script_done __P((void *)); 298 299/* 300 * Lengths of configuration options. 301 */ 302#define CILEN_VOID 2 303#define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */ 304#define CILEN_IFACEID 10 /* RFC2472, interface identifier */ 305 306#define CODENAME(x) ((x) == CONFACK ? "ACK" : \ 307 (x) == CONFNAK ? "NAK" : "REJ") 308 309/* 310 * This state variable is used to ensure that we don't 311 * run an ipcp-up/down script while one is already running. 312 */ 313static enum script_state { 314 s_down, 315 s_up, 316} ipv6cp_script_state; 317static pid_t ipv6cp_script_pid; 318 319/* 320 * setifaceid - set the interface identifiers manually 321 */ 322static int 323setifaceid(argv) 324 char **argv; 325{ 326 char *comma, *arg, c; 327 ipv6cp_options *wo = &ipv6cp_wantoptions[0]; 328 struct in6_addr addr; 329 static int prio_local, prio_remote; 330 331#define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \ 332 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) ) 333 334 arg = *argv; 335 if ((comma = strchr(arg, ',')) == NULL) 336 comma = arg + strlen(arg); 337 338 /* 339 * If comma first character, then no local identifier 340 */ 341 if (comma != arg) { 342 c = *comma; 343 *comma = '\0'; 344 345 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) { 346 option_error("Illegal interface identifier (local): %s", arg); 347 return 0; 348 } 349 350 if (option_priority >= prio_local) { 351 eui64_copy(addr.s6_addr32[2], wo->ourid); 352 wo->opt_local = 1; 353 prio_local = option_priority; 354 } 355 *comma = c; 356 } 357 358 /* 359 * If comma last character, the no remote identifier 360 */ 361 if (*comma != 0 && *++comma != '\0') { 362 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) { 363 option_error("Illegal interface identifier (remote): %s", comma); 364 return 0; 365 } 366 if (option_priority >= prio_remote) { 367 eui64_copy(addr.s6_addr32[2], wo->hisid); 368 wo->opt_remote = 1; 369 prio_remote = option_priority; 370 } 371 } 372 373 if (override_value("+ipv6", option_priority, option_source)) 374 ipv6cp_protent.enabled_flag = 1; 375 return 1; 376} 377 378char *llv6_ntoa(eui64_t ifaceid); 379 380static void 381printifaceid(opt, printer, arg) 382 option_t *opt; 383 void (*printer) __P((void *, char *, ...)); 384 void *arg; 385{ 386 ipv6cp_options *wo = &ipv6cp_wantoptions[0]; 387 388 if (wo->opt_local) 389 printer(arg, "%s", llv6_ntoa(wo->ourid)); 390 printer(arg, ","); 391 if (wo->opt_remote) 392 printer(arg, "%s", llv6_ntoa(wo->hisid)); 393} 394 395/* 396 * Make a string representation of a network address. 397 */ 398char * 399llv6_ntoa(ifaceid) 400 eui64_t ifaceid; 401{ 402 static char b[64]; 403 404 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid)); 405 return b; 406} 407 408 409/* 410 * ipv6cp_init - Initialize IPV6CP. 411 */ 412static void 413ipv6cp_init(unit) 414 int unit; 415{ 416 fsm *f = &ipv6cp_fsm[unit]; 417 ipv6cp_options *wo = &ipv6cp_wantoptions[unit]; 418 ipv6cp_options *ao = &ipv6cp_allowoptions[unit]; 419 420 f->unit = unit; 421 f->protocol = PPP_IPV6CP; 422 f->callbacks = &ipv6cp_callbacks; 423 fsm_init(&ipv6cp_fsm[unit]); 424 425 memset(wo, 0, sizeof(*wo)); 426 memset(ao, 0, sizeof(*ao)); 427 428 wo->accept_local = 1; 429 wo->neg_ifaceid = 1; 430 ao->neg_ifaceid = 1; 431 432#ifdef IPV6CP_COMP 433 wo->neg_vj = 1; 434 ao->neg_vj = 1; 435 wo->vj_protocol = IPV6CP_COMP; 436#endif 437 438} 439 440 441/* 442 * ipv6cp_open - IPV6CP is allowed to come up. 443 */ 444static void 445ipv6cp_open(unit) 446 int unit; 447{ 448 fsm_open(&ipv6cp_fsm[unit]); 449} 450 451 452/* 453 * ipv6cp_close - Take IPV6CP down. 454 */ 455static void 456ipv6cp_close(unit, reason) 457 int unit; 458 char *reason; 459{ 460 fsm_close(&ipv6cp_fsm[unit], reason); 461} 462 463 464/* 465 * ipv6cp_lowerup - The lower layer is up. 466 */ 467static void 468ipv6cp_lowerup(unit) 469 int unit; 470{ 471 fsm_lowerup(&ipv6cp_fsm[unit]); 472} 473 474 475/* 476 * ipv6cp_lowerdown - The lower layer is down. 477 */ 478static void 479ipv6cp_lowerdown(unit) 480 int unit; 481{ 482 fsm_lowerdown(&ipv6cp_fsm[unit]); 483} 484 485 486/* 487 * ipv6cp_input - Input IPV6CP packet. 488 */ 489static void 490ipv6cp_input(unit, p, len) 491 int unit; 492 u_char *p; 493 int len; 494{ 495 fsm_input(&ipv6cp_fsm[unit], p, len); 496} 497 498 499/* 500 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP. 501 * 502 * Pretend the lower layer went down, so we shut up. 503 */ 504static void 505ipv6cp_protrej(unit) 506 int unit; 507{ 508 fsm_lowerdown(&ipv6cp_fsm[unit]); 509} 510 511 512/* 513 * ipv6cp_resetci - Reset our CI. 514 */ 515static void 516ipv6cp_resetci(f) 517 fsm *f; 518{ 519 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 520 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 521 522 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid; 523 524 if (!wo->opt_local) { 525 eui64_magic_nz(wo->ourid); 526 } 527 528 *go = *wo; 529 eui64_zero(go->hisid); /* last proposed interface identifier */ 530} 531 532 533/* 534 * ipv6cp_cilen - Return length of our CI. 535 */ 536static int 537ipv6cp_cilen(f) 538 fsm *f; 539{ 540 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 541 542#define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0) 543#define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0) 544 545 return (LENCIIFACEID(go->neg_ifaceid) + 546 LENCIVJ(go->neg_vj)); 547} 548 549 550/* 551 * ipv6cp_addci - Add our desired CIs to a packet. 552 */ 553static void 554ipv6cp_addci(f, ucp, lenp) 555 fsm *f; 556 u_char *ucp; 557 int *lenp; 558{ 559 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 560 int len = *lenp; 561 562#define ADDCIVJ(opt, neg, val) \ 563 if (neg) { \ 564 int vjlen = CILEN_COMPRESS; \ 565 if (len >= vjlen) { \ 566 PUTCHAR(opt, ucp); \ 567 PUTCHAR(vjlen, ucp); \ 568 PUTSHORT(val, ucp); \ 569 len -= vjlen; \ 570 } else \ 571 neg = 0; \ 572 } 573 574#define ADDCIIFACEID(opt, neg, val1) \ 575 if (neg) { \ 576 int idlen = CILEN_IFACEID; \ 577 if (len >= idlen) { \ 578 PUTCHAR(opt, ucp); \ 579 PUTCHAR(idlen, ucp); \ 580 eui64_put(val1, ucp); \ 581 len -= idlen; \ 582 } else \ 583 neg = 0; \ 584 } 585 586 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); 587 588 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); 589 590 *lenp -= len; 591} 592 593 594/* 595 * ipv6cp_ackci - Ack our CIs. 596 * 597 * Returns: 598 * 0 - Ack was bad. 599 * 1 - Ack was good. 600 */ 601static int 602ipv6cp_ackci(f, p, len) 603 fsm *f; 604 u_char *p; 605 int len; 606{ 607 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 608 u_short cilen, citype, cishort; 609 eui64_t ifaceid; 610 611 /* 612 * CIs must be in exactly the same order that we sent... 613 * Check packet length and CI length at each step. 614 * If we find any deviations, then this packet is bad. 615 */ 616 617#define ACKCIVJ(opt, neg, val) \ 618 if (neg) { \ 619 int vjlen = CILEN_COMPRESS; \ 620 if ((len -= vjlen) < 0) \ 621 goto bad; \ 622 GETCHAR(citype, p); \ 623 GETCHAR(cilen, p); \ 624 if (cilen != vjlen || \ 625 citype != opt) \ 626 goto bad; \ 627 GETSHORT(cishort, p); \ 628 if (cishort != val) \ 629 goto bad; \ 630 } 631 632#define ACKCIIFACEID(opt, neg, val1) \ 633 if (neg) { \ 634 int idlen = CILEN_IFACEID; \ 635 if ((len -= idlen) < 0) \ 636 goto bad; \ 637 GETCHAR(citype, p); \ 638 GETCHAR(cilen, p); \ 639 if (cilen != idlen || \ 640 citype != opt) \ 641 goto bad; \ 642 eui64_get(ifaceid, p); \ 643 if (! eui64_equals(val1, ifaceid)) \ 644 goto bad; \ 645 } 646 647 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); 648 649 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); 650 651 /* 652 * If there are any remaining CIs, then this packet is bad. 653 */ 654 if (len != 0) 655 goto bad; 656 return (1); 657 658bad: 659 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!")); 660 return (0); 661} 662 663/* 664 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs. 665 * This should not modify any state if the Nak is bad 666 * or if IPV6CP is in the OPENED state. 667 * 668 * Returns: 669 * 0 - Nak was bad. 670 * 1 - Nak was good. 671 */ 672static int 673ipv6cp_nakci(f, p, len, treat_as_reject) 674 fsm *f; 675 u_char *p; 676 int len; 677 int treat_as_reject; 678{ 679 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 680 u_char citype, cilen, *next; 681 u_short cishort; 682 eui64_t ifaceid; 683 ipv6cp_options no; /* options we've seen Naks for */ 684 ipv6cp_options try; /* options to request next time */ 685 686 BZERO(&no, sizeof(no)); 687 try = *go; 688 689 /* 690 * Any Nak'd CIs must be in exactly the same order that we sent. 691 * Check packet length and CI length at each step. 692 * If we find any deviations, then this packet is bad. 693 */ 694#define NAKCIIFACEID(opt, neg, code) \ 695 if (go->neg && \ 696 len >= (cilen = CILEN_IFACEID) && \ 697 p[1] == cilen && \ 698 p[0] == opt) { \ 699 len -= cilen; \ 700 INCPTR(2, p); \ 701 eui64_get(ifaceid, p); \ 702 no.neg = 1; \ 703 code \ 704 } 705 706#define NAKCIVJ(opt, neg, code) \ 707 if (go->neg && \ 708 ((cilen = p[1]) == CILEN_COMPRESS) && \ 709 len >= cilen && \ 710 p[0] == opt) { \ 711 len -= cilen; \ 712 INCPTR(2, p); \ 713 GETSHORT(cishort, p); \ 714 no.neg = 1; \ 715 code \ 716 } 717 718 /* 719 * Accept the peer's idea of {our,his} interface identifier, if different 720 * from our idea, only if the accept_{local,remote} flag is set. 721 */ 722 NAKCIIFACEID(CI_IFACEID, neg_ifaceid, 723 if (treat_as_reject) { 724 try.neg_ifaceid = 0; 725 } else if (go->accept_local) { 726 while (eui64_iszero(ifaceid) || 727 eui64_equals(ifaceid, go->hisid)) /* bad luck */ 728 eui64_magic(ifaceid); 729 try.ourid = ifaceid; 730 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid))); 731 } 732 ); 733 734#ifdef IPV6CP_COMP 735 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 736 { 737 if (cishort == IPV6CP_COMP && !treat_as_reject) { 738 try.vj_protocol = cishort; 739 } else { 740 try.neg_vj = 0; 741 } 742 } 743 ); 744#else 745 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 746 { 747 try.neg_vj = 0; 748 } 749 ); 750#endif 751 752 /* 753 * There may be remaining CIs, if the peer is requesting negotiation 754 * on an option that we didn't include in our request packet. 755 * If they want to negotiate about interface identifier, we comply. 756 * If they want us to ask for compression, we refuse. 757 */ 758 while (len >= CILEN_VOID) { 759 GETCHAR(citype, p); 760 GETCHAR(cilen, p); 761 if ( cilen < CILEN_VOID || (len -= cilen) < 0 ) 762 goto bad; 763 next = p + cilen - 2; 764 765 switch (citype) { 766 case CI_COMPRESSTYPE: 767 if (go->neg_vj || no.neg_vj || 768 (cilen != CILEN_COMPRESS)) 769 goto bad; 770 no.neg_vj = 1; 771 break; 772 case CI_IFACEID: 773 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID) 774 goto bad; 775 try.neg_ifaceid = 1; 776 eui64_get(ifaceid, p); 777 if (go->accept_local) { 778 while (eui64_iszero(ifaceid) || 779 eui64_equals(ifaceid, go->hisid)) /* bad luck */ 780 eui64_magic(ifaceid); 781 try.ourid = ifaceid; 782 } 783 no.neg_ifaceid = 1; 784 break; 785 } 786 p = next; 787 } 788 789 /* If there is still anything left, this packet is bad. */ 790 if (len != 0) 791 goto bad; 792 793 /* 794 * OK, the Nak is good. Now we can update state. 795 */ 796 if (f->state != OPENED) 797 *go = try; 798 799 return 1; 800 801bad: 802 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!")); 803 return 0; 804} 805 806 807/* 808 * ipv6cp_rejci - Reject some of our CIs. 809 */ 810static int 811ipv6cp_rejci(f, p, len) 812 fsm *f; 813 u_char *p; 814 int len; 815{ 816 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 817 u_char cilen; 818 u_short cishort; 819 eui64_t ifaceid; 820 ipv6cp_options try; /* options to request next time */ 821 822 try = *go; 823 /* 824 * Any Rejected CIs must be in exactly the same order that we sent. 825 * Check packet length and CI length at each step. 826 * If we find any deviations, then this packet is bad. 827 */ 828#define REJCIIFACEID(opt, neg, val1) \ 829 if (go->neg && \ 830 len >= (cilen = CILEN_IFACEID) && \ 831 p[1] == cilen && \ 832 p[0] == opt) { \ 833 len -= cilen; \ 834 INCPTR(2, p); \ 835 eui64_get(ifaceid, p); \ 836 /* Check rejected value. */ \ 837 if (! eui64_equals(ifaceid, val1)) \ 838 goto bad; \ 839 try.neg = 0; \ 840 } 841 842#define REJCIVJ(opt, neg, val) \ 843 if (go->neg && \ 844 p[1] == CILEN_COMPRESS && \ 845 len >= p[1] && \ 846 p[0] == opt) { \ 847 len -= p[1]; \ 848 INCPTR(2, p); \ 849 GETSHORT(cishort, p); \ 850 /* Check rejected value. */ \ 851 if (cishort != val) \ 852 goto bad; \ 853 try.neg = 0; \ 854 } 855 856 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid); 857 858 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol); 859 860 /* 861 * If there are any remaining CIs, then this packet is bad. 862 */ 863 if (len != 0) 864 goto bad; 865 /* 866 * Now we can update state. 867 */ 868 if (f->state != OPENED) 869 *go = try; 870 return 1; 871 872bad: 873 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!")); 874 return 0; 875} 876 877 878/* 879 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response. 880 * 881 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified 882 * appropriately. If reject_if_disagree is non-zero, doesn't return 883 * CONFNAK; returns CONFREJ if it can't return CONFACK. 884 */ 885static int 886ipv6cp_reqci(f, inp, len, reject_if_disagree) 887 fsm *f; 888 u_char *inp; /* Requested CIs */ 889 int *len; /* Length of requested CIs */ 890 int reject_if_disagree; 891{ 892 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 893 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; 894 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit]; 895 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 896 u_char *cip, *next; /* Pointer to current and next CIs */ 897 u_short cilen, citype; /* Parsed len, type */ 898 u_short cishort; /* Parsed short value */ 899 eui64_t ifaceid; /* Parsed interface identifier */ 900 int rc = CONFACK; /* Final packet return code */ 901 int orc; /* Individual option return code */ 902 u_char *p; /* Pointer to next char to parse */ 903 u_char *ucp = inp; /* Pointer to current output char */ 904 int l = *len; /* Length left */ 905 906 /* 907 * Reset all his options. 908 */ 909 BZERO(ho, sizeof(*ho)); 910 911 /* 912 * Process all his options. 913 */ 914 next = inp; 915 while (l) { 916 orc = CONFACK; /* Assume success */ 917 cip = p = next; /* Remember begining of CI */ 918 if (l < 2 || /* Not enough data for CI header or */ 919 p[1] < 2 || /* CI length too small or */ 920 p[1] > l) { /* CI length too big? */ 921 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!")); 922 orc = CONFREJ; /* Reject bad CI */ 923 cilen = l; /* Reject till end of packet */ 924 l = 0; /* Don't loop again */ 925 goto endswitch; 926 } 927 GETCHAR(citype, p); /* Parse CI type */ 928 GETCHAR(cilen, p); /* Parse CI length */ 929 l -= cilen; /* Adjust remaining length */ 930 next += cilen; /* Step to next CI */ 931 932 switch (citype) { /* Check CI type */ 933 case CI_IFACEID: 934 IPV6CPDEBUG(("ipv6cp: received interface identifier ")); 935 936 if (!ao->neg_ifaceid || 937 cilen != CILEN_IFACEID) { /* Check CI length */ 938 orc = CONFREJ; /* Reject CI */ 939 break; 940 } 941 942 /* 943 * If he has no interface identifier, or if we both have same 944 * identifier then NAK it with new idea. 945 * In particular, if we don't know his identifier, but he does, 946 * then accept it. 947 */ 948 eui64_get(ifaceid, p); 949 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid))); 950 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) { 951 orc = CONFREJ; /* Reject CI */ 952 break; 953 } 954 if (!eui64_iszero(wo->hisid) && 955 !eui64_equals(ifaceid, wo->hisid) && 956 eui64_iszero(go->hisid)) { 957 958 orc = CONFNAK; 959 ifaceid = wo->hisid; 960 go->hisid = ifaceid; 961 DECPTR(sizeof(ifaceid), p); 962 eui64_put(ifaceid, p); 963 } else 964 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) { 965 orc = CONFNAK; 966 if (eui64_iszero(go->hisid)) /* first time, try option */ 967 ifaceid = wo->hisid; 968 while (eui64_iszero(ifaceid) || 969 eui64_equals(ifaceid, go->ourid)) /* bad luck */ 970 eui64_magic(ifaceid); 971 go->hisid = ifaceid; 972 DECPTR(sizeof(ifaceid), p); 973 eui64_put(ifaceid, p); 974 } 975 976 ho->neg_ifaceid = 1; 977 ho->hisid = ifaceid; 978 break; 979 980 case CI_COMPRESSTYPE: 981 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE ")); 982 if (!ao->neg_vj || 983 (cilen != CILEN_COMPRESS)) { 984 orc = CONFREJ; 985 break; 986 } 987 GETSHORT(cishort, p); 988 IPV6CPDEBUG(("(%d)", cishort)); 989 990#ifdef IPV6CP_COMP 991 if (!(cishort == IPV6CP_COMP)) { 992 orc = CONFREJ; 993 break; 994 } 995 996 ho->neg_vj = 1; 997 ho->vj_protocol = cishort; 998 break; 999#else 1000 orc = CONFREJ; 1001 break; 1002#endif 1003 1004 default: 1005 orc = CONFREJ; 1006 break; 1007 } 1008 1009endswitch: 1010 IPV6CPDEBUG((" (%s)\n", CODENAME(orc))); 1011 1012 if (orc == CONFACK && /* Good CI */ 1013 rc != CONFACK) /* but prior CI wasnt? */ 1014 continue; /* Don't send this one */ 1015 1016 if (orc == CONFNAK) { /* Nak this CI? */ 1017 if (reject_if_disagree) /* Getting fed up with sending NAKs? */ 1018 orc = CONFREJ; /* Get tough if so */ 1019 else { 1020 if (rc == CONFREJ) /* Rejecting prior CI? */ 1021 continue; /* Don't send this one */ 1022 if (rc == CONFACK) { /* Ack'd all prior CIs? */ 1023 rc = CONFNAK; /* Not anymore... */ 1024 ucp = inp; /* Backup */ 1025 } 1026 } 1027 } 1028 1029 if (orc == CONFREJ && /* Reject this CI */ 1030 rc != CONFREJ) { /* but no prior ones? */ 1031 rc = CONFREJ; 1032 ucp = inp; /* Backup */ 1033 } 1034 1035 /* Need to move CI? */ 1036 if (ucp != cip) 1037 BCOPY(cip, ucp, cilen); /* Move it */ 1038 1039 /* Update output pointer */ 1040 INCPTR(cilen, ucp); 1041 } 1042 1043 /* 1044 * If we aren't rejecting this packet, and we want to negotiate 1045 * their identifier and they didn't send their identifier, then we 1046 * send a NAK with a CI_IFACEID option appended. We assume the 1047 * input buffer is long enough that we can append the extra 1048 * option safely. 1049 */ 1050 if (rc != CONFREJ && !ho->neg_ifaceid && 1051 wo->req_ifaceid && !reject_if_disagree) { 1052 if (rc == CONFACK) { 1053 rc = CONFNAK; 1054 ucp = inp; /* reset pointer */ 1055 wo->req_ifaceid = 0; /* don't ask again */ 1056 } 1057 PUTCHAR(CI_IFACEID, ucp); 1058 PUTCHAR(CILEN_IFACEID, ucp); 1059 eui64_put(wo->hisid, ucp); 1060 } 1061 1062 *len = ucp - inp; /* Compute output length */ 1063 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc))); 1064 return (rc); /* Return final code */ 1065} 1066 1067 1068/* 1069 * ipv6_check_options - check that any IP-related options are OK, 1070 * and assign appropriate defaults. 1071 */ 1072static void 1073ipv6_check_options() 1074{ 1075 ipv6cp_options *wo = &ipv6cp_wantoptions[0]; 1076 1077 if (!ipv6cp_protent.enabled_flag) 1078 return; 1079 1080#if defined(SOL2) || defined(__linux__) 1081 /* 1082 * Persistent link-local id is only used when user has not explicitly 1083 * configure/hard-code the id 1084 */ 1085 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) { 1086 1087 /* 1088 * On systems where there are no Ethernet interfaces used, there 1089 * may be other ways to obtain a persistent id. Right now, it 1090 * will fall back to using magic [see eui64_magic] below when 1091 * an EUI-48 from MAC address can't be obtained. Other possibilities 1092 * include obtaining EEPROM serial numbers, or some other unique 1093 * yet persistent number. On Sparc platforms, this is possible, 1094 * but too bad there's no standards yet for x86 machines. 1095 */ 1096 if (ether_to_eui64(&wo->ourid)) { 1097 wo->opt_local = 1; 1098 } 1099 } 1100#endif 1101 1102 if (!wo->opt_local) { /* init interface identifier */ 1103 if (wo->use_ip && eui64_iszero(wo->ourid)) { 1104 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr)); 1105 if (!eui64_iszero(wo->ourid)) 1106 wo->opt_local = 1; 1107 } 1108 1109 while (eui64_iszero(wo->ourid)) 1110 eui64_magic(wo->ourid); 1111 } 1112 1113 if (!wo->opt_remote) { 1114 if (wo->use_ip && eui64_iszero(wo->hisid)) { 1115 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr)); 1116 if (!eui64_iszero(wo->hisid)) 1117 wo->opt_remote = 1; 1118 } 1119 } 1120 1121 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) { 1122 option_error("local/remote LL address required for demand-dialling\n"); 1123 exit(1); 1124 } 1125} 1126 1127 1128/* 1129 * ipv6_demand_conf - configure the interface as though 1130 * IPV6CP were up, for use with dial-on-demand. 1131 */ 1132static int 1133ipv6_demand_conf(u) 1134 int u; 1135{ 1136 ipv6cp_options *wo = &ipv6cp_wantoptions[u]; 1137 1138#if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1139#if defined(SOL2) 1140 if (!sif6up(u)) 1141 return 0; 1142#else 1143 if (!sifup(u)) 1144 return 0; 1145#endif /* defined(SOL2) */ 1146#endif 1147 if (!sif6addr(u, wo->ourid, wo->hisid)) 1148 return 0; 1149#if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1150 if (!sifup(u)) 1151 return 0; 1152#endif 1153 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE)) 1154 return 0; 1155 1156 notice("ipv6_demand_conf"); 1157 notice("local LL address %s", llv6_ntoa(wo->ourid)); 1158 notice("remote LL address %s", llv6_ntoa(wo->hisid)); 1159 1160 return 1; 1161} 1162 1163 1164/* 1165 * ipv6cp_up - IPV6CP has come UP. 1166 * 1167 * Configure the IPv6 network interface appropriately and bring it up. 1168 */ 1169static void 1170ipv6cp_up(f) 1171 fsm *f; 1172{ 1173 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; 1174 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 1175 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 1176 1177 IPV6CPDEBUG(("ipv6cp: up")); 1178 1179 /* 1180 * We must have a non-zero LL address for both ends of the link. 1181 */ 1182 if (!ho->neg_ifaceid) 1183 ho->hisid = wo->hisid; 1184 1185 if(!no_ifaceid_neg) { 1186 if (eui64_iszero(ho->hisid)) { 1187 error("Could not determine remote LL address"); 1188 ipv6cp_close(f->unit, "Could not determine remote LL address"); 1189 return; 1190 } 1191 if (eui64_iszero(go->ourid)) { 1192 error("Could not determine local LL address"); 1193 ipv6cp_close(f->unit, "Could not determine local LL address"); 1194 return; 1195 } 1196 if (eui64_equals(go->ourid, ho->hisid)) { 1197 error("local and remote LL addresses are equal"); 1198 ipv6cp_close(f->unit, "local and remote LL addresses are equal"); 1199 return; 1200 } 1201 } 1202 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0); 1203 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0); 1204 1205#ifdef IPV6CP_COMP 1206 /* set tcp compression */ 1207 sif6comp(f->unit, ho->neg_vj); 1208#endif 1209 1210 /* 1211 * If we are doing dial-on-demand, the interface is already 1212 * configured, so we put out any saved-up packets, then set the 1213 * interface to pass IPv6 packets. 1214 */ 1215 if (demand) { 1216 if (! eui64_equals(go->ourid, wo->ourid) || 1217 ! eui64_equals(ho->hisid, wo->hisid)) { 1218 if (! eui64_equals(go->ourid, wo->ourid)) 1219 warn("Local LL address changed to %s", 1220 llv6_ntoa(go->ourid)); 1221 if (! eui64_equals(ho->hisid, wo->hisid)) 1222 warn("Remote LL address changed to %s", 1223 llv6_ntoa(ho->hisid)); 1224 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid); 1225 1226 /* Set the interface to the new addresses */ 1227 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1228 if (debug) 1229 warn("sif6addr failed"); 1230 ipv6cp_close(f->unit, "Interface configuration failed"); 1231 return; 1232 } 1233 1234 } 1235 demand_rexmit(PPP_IPV6); 1236 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS); 1237 1238 } else { 1239 /* 1240 * Set LL addresses 1241 */ 1242#if !defined(__linux__) && !defined(SOL2) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1243 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1244 if (debug) 1245 warn("sif6addr failed"); 1246 ipv6cp_close(f->unit, "Interface configuration failed"); 1247 return; 1248 } 1249#endif 1250 1251 /* bring the interface up for IPv6 */ 1252#if defined(SOL2) 1253 if (!sif6up(f->unit)) { 1254 if (debug) 1255 warn("sifup failed (IPV6)"); 1256 ipv6cp_close(f->unit, "Interface configuration failed"); 1257 return; 1258 } 1259#else 1260 if (!sifup(f->unit)) { 1261 if (debug) 1262 warn("sifup failed (IPV6)"); 1263 ipv6cp_close(f->unit, "Interface configuration failed"); 1264 return; 1265 } 1266#endif /* defined(SOL2) */ 1267 1268#if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1269 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1270 if (debug) 1271 warn("sif6addr failed"); 1272 ipv6cp_close(f->unit, "Interface configuration failed"); 1273 return; 1274 } 1275#endif 1276 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS); 1277 1278 notice("local LL address %s", llv6_ntoa(go->ourid)); 1279 notice("remote LL address %s", llv6_ntoa(ho->hisid)); 1280 } 1281 1282 np_up(f->unit, PPP_IPV6); 1283 ipv6cp_is_up = 1; 1284 1285 /* 1286 * Execute the ipv6-up script, like this: 1287 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL 1288 */ 1289 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) { 1290 ipv6cp_script_state = s_up; 1291 ipv6cp_script(_PATH_IPV6UP); 1292 } 1293} 1294 1295 1296/* 1297 * ipv6cp_down - IPV6CP has gone DOWN. 1298 * 1299 * Take the IPv6 network interface down, clear its addresses 1300 * and delete routes through it. 1301 */ 1302static void 1303ipv6cp_down(f) 1304 fsm *f; 1305{ 1306 IPV6CPDEBUG(("ipv6cp: down")); 1307 update_link_stats(f->unit); 1308 if (ipv6cp_is_up) { 1309 ipv6cp_is_up = 0; 1310 np_down(f->unit, PPP_IPV6); 1311 } 1312#ifdef IPV6CP_COMP 1313 sif6comp(f->unit, 0); 1314#endif 1315 1316 /* 1317 * If we are doing dial-on-demand, set the interface 1318 * to queue up outgoing packets (for now). 1319 */ 1320 if (demand) { 1321 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE); 1322 } else { 1323 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP); 1324#if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC))) 1325#if defined(SOL2) 1326 sif6down(f->unit); 1327#else 1328 sifdown(f->unit); 1329#endif /* defined(SOL2) */ 1330#endif 1331 ipv6cp_clear_addrs(f->unit, 1332 ipv6cp_gotoptions[f->unit].ourid, 1333 ipv6cp_hisoptions[f->unit].hisid); 1334#if defined(__linux__) || (defined(SVR4) && (defined(SNI) || defined(__USLC))) 1335 sifdown(f->unit); 1336#endif 1337 } 1338 1339 /* Execute the ipv6-down script */ 1340 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) { 1341 ipv6cp_script_state = s_down; 1342 ipv6cp_script(_PATH_IPV6DOWN); 1343 } 1344} 1345 1346 1347/* 1348 * ipv6cp_clear_addrs() - clear the interface addresses, routes, 1349 * proxy neighbour discovery entries, etc. 1350 */ 1351static void 1352ipv6cp_clear_addrs(unit, ourid, hisid) 1353 int unit; 1354 eui64_t ourid; 1355 eui64_t hisid; 1356{ 1357 cif6addr(unit, ourid, hisid); 1358} 1359 1360 1361/* 1362 * ipv6cp_finished - possibly shut down the lower layers. 1363 */ 1364static void 1365ipv6cp_finished(f) 1366 fsm *f; 1367{ 1368 np_finished(f->unit, PPP_IPV6); 1369} 1370 1371 1372/* 1373 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script 1374 * has finished. 1375 */ 1376static void 1377ipv6cp_script_done(arg) 1378 void *arg; 1379{ 1380 ipv6cp_script_pid = 0; 1381 switch (ipv6cp_script_state) { 1382 case s_up: 1383 if (ipv6cp_fsm[0].state != OPENED) { 1384 ipv6cp_script_state = s_down; 1385 ipv6cp_script(_PATH_IPV6DOWN); 1386 } 1387 break; 1388 case s_down: 1389 if (ipv6cp_fsm[0].state == OPENED) { 1390 ipv6cp_script_state = s_up; 1391 ipv6cp_script(_PATH_IPV6UP); 1392 } 1393 break; 1394 } 1395} 1396 1397 1398/* 1399 * ipv6cp_script - Execute a script with arguments 1400 * interface-name tty-name speed local-LL remote-LL. 1401 */ 1402static void 1403ipv6cp_script(script) 1404 char *script; 1405{ 1406 char strspeed[32], strlocal[32], strremote[32]; 1407 char *argv[8]; 1408 1409 sprintf(strspeed, "%d", baud_rate); 1410 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid)); 1411 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid)); 1412 1413 argv[0] = script; 1414 argv[1] = ifname; 1415 argv[2] = devnam; 1416 argv[3] = strspeed; 1417 argv[4] = strlocal; 1418 argv[5] = strremote; 1419 argv[6] = ipparam; 1420 argv[7] = NULL; 1421 1422 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done, 1423 NULL, 0); 1424} 1425 1426/* 1427 * ipv6cp_printpkt - print the contents of an IPV6CP packet. 1428 */ 1429static char *ipv6cp_codenames[] = { 1430 "ConfReq", "ConfAck", "ConfNak", "ConfRej", 1431 "TermReq", "TermAck", "CodeRej" 1432}; 1433 1434static int 1435ipv6cp_printpkt(p, plen, printer, arg) 1436 u_char *p; 1437 int plen; 1438 void (*printer) __P((void *, char *, ...)); 1439 void *arg; 1440{ 1441 int code, id, len, olen; 1442 u_char *pstart, *optend; 1443 u_short cishort; 1444 eui64_t ifaceid; 1445 1446 if (plen < HEADERLEN) 1447 return 0; 1448 pstart = p; 1449 GETCHAR(code, p); 1450 GETCHAR(id, p); 1451 GETSHORT(len, p); 1452 if (len < HEADERLEN || len > plen) 1453 return 0; 1454 1455 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *)) 1456 printer(arg, " %s", ipv6cp_codenames[code-1]); 1457 else 1458 printer(arg, " code=0x%x", code); 1459 printer(arg, " id=0x%x", id); 1460 len -= HEADERLEN; 1461 switch (code) { 1462 case CONFREQ: 1463 case CONFACK: 1464 case CONFNAK: 1465 case CONFREJ: 1466 /* print option list */ 1467 while (len >= 2) { 1468 GETCHAR(code, p); 1469 GETCHAR(olen, p); 1470 p -= 2; 1471 if (olen < 2 || olen > len) { 1472 break; 1473 } 1474 printer(arg, " <"); 1475 len -= olen; 1476 optend = p + olen; 1477 switch (code) { 1478 case CI_COMPRESSTYPE: 1479 if (olen >= CILEN_COMPRESS) { 1480 p += 2; 1481 GETSHORT(cishort, p); 1482 printer(arg, "compress "); 1483 printer(arg, "0x%x", cishort); 1484 } 1485 break; 1486 case CI_IFACEID: 1487 if (olen == CILEN_IFACEID) { 1488 p += 2; 1489 eui64_get(ifaceid, p); 1490 printer(arg, "addr %s", llv6_ntoa(ifaceid)); 1491 } 1492 break; 1493 } 1494 while (p < optend) { 1495 GETCHAR(code, p); 1496 printer(arg, " %.2x", code); 1497 } 1498 printer(arg, ">"); 1499 } 1500 break; 1501 1502 case TERMACK: 1503 case TERMREQ: 1504 if (len > 0 && *p >= ' ' && *p < 0x7f) { 1505 printer(arg, " "); 1506 print_string((char *)p, len, printer, arg); 1507 p += len; 1508 len = 0; 1509 } 1510 break; 1511 } 1512 1513 /* print the rest of the bytes in the packet */ 1514 for (; len > 0; --len) { 1515 GETCHAR(code, p); 1516 printer(arg, " %.2x", code); 1517 } 1518 1519 return p - pstart; 1520} 1521 1522/* 1523 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for. 1524 * We don't bring the link up for IP fragments or for TCP FIN packets 1525 * with no data. 1526 */ 1527#define IP6_HDRLEN 40 /* bytes */ 1528#define IP6_NHDR_FRAG 44 /* fragment IPv6 header */ 1529#define TCP_HDRLEN 20 1530#define TH_FIN 0x01 1531 1532/* 1533 * We use these macros because the IP header may be at an odd address, 1534 * and some compilers might use word loads to get th_off or ip_hl. 1535 */ 1536 1537#define get_ip6nh(x) (((unsigned char *)(x))[6]) 1538#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) 1539#define get_tcpflags(x) (((unsigned char *)(x))[13]) 1540 1541static int 1542ipv6_active_pkt(pkt, len) 1543 u_char *pkt; 1544 int len; 1545{ 1546 u_char *tcp; 1547 1548 len -= PPP_HDRLEN; 1549 pkt += PPP_HDRLEN; 1550 if (len < IP6_HDRLEN) 1551 return 0; 1552 if (get_ip6nh(pkt) == IP6_NHDR_FRAG) 1553 return 0; 1554 if (get_ip6nh(pkt) != IPPROTO_TCP) 1555 return 1; 1556 if (len < IP6_HDRLEN + TCP_HDRLEN) 1557 return 0; 1558 tcp = pkt + IP6_HDRLEN; 1559 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4) 1560 return 0; 1561 return 1; 1562} 1563