1 /* 2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 * Copyright (c) 2016 by Delphix. All rights reserved. 5 * 6 * 7 ipv6cp.c - PPP IPV6 Control Protocol. 8 Copyright (C) 1999 Tommi Komulainen <Tommi.Komulainen@iki.fi> 9 10 Redistribution and use in source and binary forms are permitted 11 provided that the above copyright notice and this paragraph are 12 duplicated in all such forms. The name of the author may not be 13 used to endorse or promote products derived from this software 14 without specific prior written permission. 15 THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 16 IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 17 WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 18 */ 19 20 /* Original version, based on RFC2023 : 21 22 Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt, 23 Alain.Durand@imag.fr, IMAG, 24 Jean-Luc.Richier@imag.fr, IMAG-LSR. 25 26 Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE, 27 Alain.Durand@imag.fr, IMAG, 28 Jean-Luc.Richier@imag.fr, IMAG-LSR. 29 30 Ce travail a �t� fait au sein du GIE DYADE (Groupement d'Int�r�t 31 �conomique ayant pour membres BULL S.A. et l'INRIA). 32 33 Ce logiciel informatique est disponible aux conditions 34 usuelles dans la recherche, c'est-�-dire qu'il peut 35 �tre utilis�, copi�, modifi�, distribu� � l'unique 36 condition que ce texte soit conserv� afin que 37 l'origine de ce logiciel soit reconnue. 38 39 Le nom de l'Institut National de Recherche en Informatique 40 et en Automatique (INRIA), de l'IMAG, ou d'une personne morale 41 ou physique ayant particip� � l'�laboration de ce logiciel ne peut 42 �tre utilis� sans son accord pr�alable explicite. 43 44 Ce logiciel est fourni tel quel sans aucune garantie, 45 support ou responsabilit� d'aucune sorte. 46 Ce logiciel est d�riv� de sources d'origine 47 "University of California at Berkeley" et 48 "Digital Equipment Corporation" couvertes par des copyrights. 49 50 L'Institut d'Informatique et de Math�matiques Appliqu�es de Grenoble (IMAG) 51 est une f�d�ration d'unit�s mixtes de recherche du CNRS, de l'Institut National 52 Polytechnique de Grenoble et de l'Universit� Joseph Fourier regroupant 53 sept laboratoires dont le laboratoire Logiciels, Syst�mes, R�seaux (LSR). 54 55 This work has been done in the context of GIE DYADE (joint R & D venture 56 between BULL S.A. and INRIA). 57 58 This software is available with usual "research" terms 59 with the aim of retain credits of the software. 60 Permission to use, copy, modify and distribute this software for any 61 purpose and without fee is hereby granted, provided that the above 62 copyright notice and this permission notice appear in all copies, 63 and the name of INRIA, IMAG, or any contributor not be used in advertising 64 or publicity pertaining to this material without the prior explicit 65 permission. The software is provided "as is" without any 66 warranties, support or liabilities of any kind. 67 This software is derived from source code from 68 "University of California at Berkeley" and 69 "Digital Equipment Corporation" protected by copyrights. 70 71 Grenoble's Institute of Computer Science and Applied Mathematics (IMAG) 72 is a federation of seven research units funded by the CNRS, National 73 Polytechnic Institute of Grenoble and University Joseph Fourier. 74 The research unit in Software, Systems, Networks (LSR) is member of IMAG. 75 */ 76 77 /* 78 * Derived from : 79 * 80 * 81 * ipcp.c - PPP IP Control Protocol. 82 * 83 * Copyright (c) 1989 Carnegie Mellon University. 84 * All rights reserved. 85 * 86 * Redistribution and use in source and binary forms are permitted 87 * provided that the above copyright notice and this paragraph are 88 * duplicated in all such forms and that any documentation, 89 * advertising materials, and other materials related to such 90 * distribution and use acknowledge that the software was developed 91 * by Carnegie Mellon University. The name of the 92 * University may not be used to endorse or promote products derived 93 * from this software without specific prior written permission. 94 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 95 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 96 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 97 * 98 * $Id: ipv6cp.c,v 1.9 2000/04/15 01:27:11 masputra Exp $ 99 */ 100 101 /* 102 * TODO: 103 * 104 * Proxy Neighbour Discovery. 105 * 106 * Better defines for selecting the ordering of 107 * interface up / set address. (currently checks for __linux__, 108 * since SVR4 && (SNI || __USLC__) didn't work properly) 109 */ 110 111 #include <stdio.h> 112 #include <string.h> 113 #include <stdlib.h> 114 #include <unistd.h> 115 #include <netdb.h> 116 #include <sys/param.h> 117 #include <sys/types.h> 118 #include <sys/socket.h> 119 #include <netinet/in.h> 120 #include <arpa/inet.h> 121 122 #include "pppd.h" 123 #include "eui64.h" 124 #include "fsm.h" 125 #include "ipcp.h" 126 #include "ipv6cp.h" 127 #include "magic.h" 128 #include "pathnames.h" 129 130 /* global vars */ 131 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */ 132 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ 133 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ 134 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */ 135 int no_ifaceid_neg = 0; 136 137 /* local vars */ 138 static bool ipv6cp_is_up; 139 140 /* 141 * Callbacks for fsm code. (CI = Configuration Information) 142 */ 143 static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */ 144 static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */ 145 static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ 146 static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ 147 static int ipv6cp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ 148 static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ 149 static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ 150 static void ipv6cp_up __P((fsm *)); /* We're UP */ 151 static void ipv6cp_down __P((fsm *)); /* We're DOWN */ 152 static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */ 153 154 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */ 155 156 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */ 157 ipv6cp_resetci, /* Reset our Configuration Information */ 158 ipv6cp_cilen, /* Length of our Configuration Information */ 159 ipv6cp_addci, /* Add our Configuration Information */ 160 ipv6cp_ackci, /* ACK our Configuration Information */ 161 ipv6cp_nakci, /* NAK our Configuration Information */ 162 ipv6cp_rejci, /* Reject our Configuration Information */ 163 ipv6cp_reqci, /* Request peer's Configuration Information */ 164 ipv6cp_up, /* Called when fsm reaches OPENED state */ 165 ipv6cp_down, /* Called when fsm leaves OPENED state */ 166 NULL, /* Called when we want the lower layer up */ 167 ipv6cp_finished, /* Called when we want the lower layer down */ 168 NULL, /* Retransmission is necessary */ 169 NULL, /* Called to handle protocol-specific codes */ 170 "IPV6CP", /* String name of protocol */ 171 NULL /* Peer rejected a code number */ 172 }; 173 174 static int setifaceid __P((char **arg, option_t *)); 175 176 /* 177 * Command-line options. 178 */ 179 static option_t ipv6cp_option_list[] = { 180 { "ipv6", o_special, (void *)setifaceid, 181 "Set interface identifiers for IPV6" }, 182 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag, 183 "Disable IPv6 and IPv6CP" }, 184 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag, 185 "Disable IPv6 and IPv6CP" }, 186 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag, 187 "Enable IPv6 and IPv6CP", 1 }, 188 { "ipv6cp-accept-local", o_bool, &ipv6cp_wantoptions[0].accept_local, 189 "Accept peer's interface identifier for us", 1 }, 190 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_wantoptions[0].use_ip, 191 "Use (default) IPv4 address as interface identifier", 1 }, 192 #if defined(SOL2) 193 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent, 194 "Use unique persistent value for link local address", 1 }, 195 #endif /* defined(SOL2) */ 196 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime, 197 "Set timeout for IPv6CP" }, 198 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits, 199 "Maximum number of IPV6CP Terminate-Request" }, 200 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits, 201 "Maximum number of IPV6CP Configure-Request" }, 202 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops, 203 "Maximum number of IPV6CP Configure-Nak" }, 204 { NULL } 205 }; 206 207 208 /* 209 * Protocol entry points from main code. 210 */ 211 static void ipv6cp_init __P((int)); 212 static void ipv6cp_open __P((int)); 213 static void ipv6cp_close __P((int, char *)); 214 static void ipv6cp_lowerup __P((int)); 215 static void ipv6cp_lowerdown __P((int)); 216 static void ipv6cp_input __P((int, u_char *, int)); 217 static void ipv6cp_protrej __P((int)); 218 static int ipv6cp_printpkt __P((u_char *, int, 219 void (*) __P((void *, const char *, ...)), void *)); 220 static void ipv6_check_options __P((void)); 221 static int ipv6_demand_conf __P((int)); 222 static int ipv6_active_pkt __P((u_char *, int)); 223 224 struct protent ipv6cp_protent = { 225 PPP_IPV6CP, /* Protocol Number for IPV6CP */ 226 ipv6cp_init, /* Initializes IPV6CP */ 227 ipv6cp_input, /* Processes a received IPV6CP packet */ 228 ipv6cp_protrej, /* Process a received Protocol-reject */ 229 ipv6cp_lowerup, /* Called when LCP is brought up */ 230 ipv6cp_lowerdown, /* Called when LCP has gone down */ 231 ipv6cp_open, /* Called when link is established */ 232 ipv6cp_close, /* Called when link has gone down */ 233 ipv6cp_printpkt, /* Print a packet in human readable form */ 234 NULL, /* Process a received data packet */ 235 0, /* IPV6CP is disabled by default */ 236 "IPV6CP", /* Name of the protocol */ 237 "IPV6", /* Name of the corresponding data protocol */ 238 ipv6cp_option_list, /* List of IPV6CP command-line options */ 239 ipv6_check_options, /* Assigns default values for options */ 240 ipv6_demand_conf, /* Configures demand-dial */ 241 ipv6_active_pkt /* Bring up the link for this packet? */ 242 }; 243 244 /* 245 * Local forward function declarations. 246 */ 247 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t)); 248 static void ipv6cp_script __P((char *)); 249 static void ipv6cp_script_done __P((void *, int)); 250 251 /* 252 * Lengths of configuration options. 253 */ 254 #define CILEN_VOID 2 255 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */ 256 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */ 257 258 #define CODENAME(x) ((x) == CODE_CONFACK ? "ACK" : \ 259 (x) == CODE_CONFNAK ? "NAK" : "REJ") 260 261 /* 262 * This state variable is used to ensure that we don't 263 * run an ipcp-up/down script while one is already running. 264 */ 265 static enum script_state { 266 s_down, 267 s_up 268 } ipv6cp_script_state; 269 static pid_t ipv6cp_script_pid; 270 271 /* 272 * setifaceid - set the interface identifiers manually 273 */ 274 /*ARGSUSED*/ 275 static int 276 setifaceid(argv, opt) 277 char **argv; 278 option_t *opt; 279 { 280 char *comma, *arg; 281 ipv6cp_options *wo = &ipv6cp_wantoptions[0]; 282 struct in6_addr addr; 283 284 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \ 285 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) ) 286 287 288 arg = *argv; 289 290 comma = strchr(arg, ','); 291 292 /* 293 * If comma first character, then no local identifier 294 */ 295 if (comma != arg) { 296 if (comma != NULL) 297 *comma = '\0'; 298 299 if (inet_pton(AF_INET6, arg, &addr) != 1 || !VALIDID(addr)) { 300 option_error("Illegal interface identifier (local): %s", arg); 301 return 0; 302 } 303 304 eui64_copy(addr.s6_addr32[2], wo->ourid); 305 wo->opt_local = 1; 306 } 307 308 /* 309 * If comma last character, then no remote identifier 310 */ 311 if (comma != NULL && *++comma != '\0') { 312 if (inet_pton(AF_INET6, comma, &addr) != 1 || !VALIDID(addr)) { 313 option_error("Illegal interface identifier (remote): %s", comma); 314 return 0; 315 } 316 eui64_copy(addr.s6_addr32[2], wo->hisid); 317 wo->opt_remote = 1; 318 } 319 320 ipv6cp_protent.enabled_flag = 1; 321 return 1; 322 } 323 324 /* 325 * Given an interface identifier, return a string representation of the 326 * link local address associated with that identifier. 327 * string will be at most 26 characters (including null terminator). 328 */ 329 static char * 330 llv6_ntoa(ifaceid) 331 eui64_t ifaceid; 332 { 333 struct in6_addr addr; 334 static char addrstr[26]; 335 336 BZERO(&addr, sizeof (addr)); 337 addr.s6_addr[0] = 0xfe; 338 addr.s6_addr[1] = 0x80; 339 eui64_copy(ifaceid, addr.s6_addr[8]); 340 341 (void) inet_ntop(AF_INET6, &addr, addrstr, 26); 342 343 return addrstr; 344 } 345 346 347 /* 348 * ipv6cp_init - Initialize IPV6CP. 349 */ 350 static void 351 ipv6cp_init(unit) 352 int unit; 353 { 354 fsm *f = &ipv6cp_fsm[unit]; 355 ipv6cp_options *wo = &ipv6cp_wantoptions[unit]; 356 ipv6cp_options *ao = &ipv6cp_allowoptions[unit]; 357 358 f->unit = unit; 359 f->protocol = PPP_IPV6CP; 360 f->callbacks = &ipv6cp_callbacks; 361 fsm_init(&ipv6cp_fsm[unit]); 362 363 BZERO(wo, sizeof(*wo)); 364 BZERO(ao, sizeof(*ao)); 365 366 wo->neg_ifaceid = 1; 367 ao->neg_ifaceid = 1; 368 369 #ifdef IPV6CP_COMP 370 wo->neg_vj = 1; 371 ao->neg_vj = 1; 372 wo->vj_protocol = IPV6CP_COMP; 373 #endif 374 375 } 376 377 378 /* 379 * ipv6cp_open - IPV6CP is allowed to come up. 380 */ 381 static void 382 ipv6cp_open(unit) 383 int unit; 384 { 385 fsm_open(&ipv6cp_fsm[unit]); 386 } 387 388 389 /* 390 * ipv6cp_close - Take IPV6CP down. 391 */ 392 static void 393 ipv6cp_close(unit, reason) 394 int unit; 395 char *reason; 396 { 397 fsm_close(&ipv6cp_fsm[unit], reason); 398 } 399 400 401 /* 402 * ipv6cp_lowerup - The lower layer is up. 403 */ 404 static void 405 ipv6cp_lowerup(unit) 406 int unit; 407 { 408 fsm_lowerup(&ipv6cp_fsm[unit]); 409 } 410 411 412 /* 413 * ipv6cp_lowerdown - The lower layer is down. 414 */ 415 static void 416 ipv6cp_lowerdown(unit) 417 int unit; 418 { 419 fsm_lowerdown(&ipv6cp_fsm[unit]); 420 } 421 422 423 /* 424 * ipv6cp_input - Input IPV6CP packet. 425 */ 426 static void 427 ipv6cp_input(unit, p, len) 428 int unit; 429 u_char *p; 430 int len; 431 { 432 fsm_input(&ipv6cp_fsm[unit], p, len); 433 } 434 435 436 /* 437 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP. 438 */ 439 static void 440 ipv6cp_protrej(unit) 441 int unit; 442 { 443 fsm_protreject(&ipv6cp_fsm[unit]); 444 } 445 446 447 /* 448 * ipv6cp_resetci - Reset our CI. 449 */ 450 static void 451 ipv6cp_resetci(f) 452 fsm *f; 453 { 454 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 455 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 456 457 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid; 458 459 if (!wo->opt_local) { 460 eui64_magic_nz(wo->ourid); 461 } 462 463 *go = *wo; 464 eui64_zero(go->hisid); /* last proposed interface identifier */ 465 } 466 467 468 /* 469 * ipv6cp_cilen - Return length of our CI. 470 */ 471 static int 472 ipv6cp_cilen(f) 473 fsm *f; 474 { 475 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 476 477 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0) 478 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0) 479 480 return (LENCIIFACEID(go->neg_ifaceid) + 481 LENCIVJ(go->neg_vj)); 482 } 483 484 485 /* 486 * ipv6cp_addci - Add our desired CIs to a packet. 487 */ 488 static void 489 ipv6cp_addci(f, ucp, lenp) 490 fsm *f; 491 u_char *ucp; 492 int *lenp; 493 { 494 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 495 int len = *lenp; 496 497 #define ADDCIVJ(opt, neg, val) \ 498 if (neg) { \ 499 int vjlen = CILEN_COMPRESS; \ 500 if (len >= vjlen) { \ 501 PUTCHAR(opt, ucp); \ 502 PUTCHAR(vjlen, ucp); \ 503 PUTSHORT(val, ucp); \ 504 len -= vjlen; \ 505 } else \ 506 neg = 0; \ 507 } 508 509 #define ADDCIIFACEID(opt, neg, val1) \ 510 if (neg) { \ 511 int idlen = CILEN_IFACEID; \ 512 if (len >= idlen) { \ 513 PUTCHAR(opt, ucp); \ 514 PUTCHAR(idlen, ucp); \ 515 eui64_put(val1, ucp); \ 516 len -= idlen; \ 517 } else \ 518 neg = 0; \ 519 } 520 521 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); 522 523 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); 524 525 *lenp -= len; 526 } 527 528 529 /* 530 * ipv6cp_ackci - Ack our CIs. 531 * 532 * Returns: 533 * 0 - Ack was bad. 534 * 1 - Ack was good. 535 */ 536 static int 537 ipv6cp_ackci(f, p, len) 538 fsm *f; 539 u_char *p; 540 int len; 541 { 542 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 543 u_short cilen, citype, cishort; 544 eui64_t ifaceid; 545 546 /* 547 * CIs must be in exactly the same order that we sent... 548 * Check packet length and CI length at each step. 549 * If we find any deviations, then this packet is bad. 550 */ 551 552 #define ACKCIVJ(opt, neg, val) \ 553 if (neg) { \ 554 int vjlen = CILEN_COMPRESS; \ 555 if ((len -= vjlen) < 0) \ 556 goto bad; \ 557 GETCHAR(citype, p); \ 558 GETCHAR(cilen, p); \ 559 if (cilen != vjlen || \ 560 citype != opt) \ 561 goto bad; \ 562 GETSHORT(cishort, p); \ 563 if (cishort != val) \ 564 goto bad; \ 565 } 566 567 #define ACKCIIFACEID(opt, neg, val1) \ 568 if (neg) { \ 569 int idlen = CILEN_IFACEID; \ 570 if ((len -= idlen) < 0) \ 571 goto bad; \ 572 GETCHAR(citype, p); \ 573 GETCHAR(cilen, p); \ 574 if (cilen != idlen || \ 575 citype != opt) \ 576 goto bad; \ 577 eui64_get(ifaceid, p); \ 578 if (! eui64_equals(val1, ifaceid)) \ 579 goto bad; \ 580 } 581 582 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); 583 584 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); 585 586 /* 587 * If there are any remaining CIs, then this packet is bad. 588 */ 589 if (len != 0) 590 goto bad; 591 return (1); 592 593 bad: 594 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!")); 595 return (0); 596 } 597 598 /* 599 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs. 600 * This should not modify any state if the Nak is bad 601 * or if IPV6CP is in the OPENED state. 602 * 603 * Returns: 604 * 0 - Nak was bad. 605 * 1 - Nak was good. 606 */ 607 static int 608 ipv6cp_nakci(f, p, len) 609 fsm *f; 610 u_char *p; 611 int len; 612 { 613 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 614 u_char citype, cilen, *next; 615 u_short cishort; 616 eui64_t ifaceid; 617 ipv6cp_options no; /* options we've seen Naks for */ 618 ipv6cp_options try; /* options to request next time */ 619 620 BZERO(&no, sizeof(no)); 621 try = *go; 622 623 /* 624 * Any Nak'd CIs must be in exactly the same order that we sent. 625 * Check packet length and CI length at each step. 626 * If we find any deviations, then this packet is bad. 627 */ 628 #define NAKCIIFACEID(opt, neg, code) \ 629 if (go->neg && \ 630 len >= (cilen = CILEN_IFACEID) && \ 631 p[1] == cilen && \ 632 p[0] == opt) { \ 633 len -= cilen; \ 634 INCPTR(2, p); \ 635 eui64_get(ifaceid, p); \ 636 no.neg = 1; \ 637 code \ 638 } 639 640 #define NAKCIVJ(opt, neg, code) \ 641 if (go->neg && \ 642 ((cilen = p[1]) == CILEN_COMPRESS) && \ 643 len >= cilen && \ 644 p[0] == opt) { \ 645 len -= cilen; \ 646 INCPTR(2, p); \ 647 GETSHORT(cishort, p); \ 648 no.neg = 1; \ 649 code \ 650 } 651 652 /* 653 * Accept the peer's idea of {our,its} interface identifier, if different 654 * from our idea, only if the accept_{local,remote} flag is set. 655 */ 656 NAKCIIFACEID(CI_IFACEID, neg_ifaceid, 657 if (go->accept_local) { 658 while (eui64_iszero(ifaceid) || 659 eui64_equals(ifaceid, go->hisid)) /* bad luck */ 660 eui64_magic(ifaceid); 661 try.ourid = ifaceid; 662 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid))); 663 } 664 ); 665 666 #ifdef IPV6CP_COMP 667 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 668 { 669 if (cishort == IPV6CP_COMP) { 670 try.vj_protocol = cishort; 671 } else { 672 try.neg_vj = 0; 673 } 674 } 675 ); 676 #else 677 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 678 { 679 try.neg_vj = 0; 680 } 681 ); 682 #endif 683 684 /* 685 * There may be remaining CIs, if the peer is requesting negotiation 686 * on an option that we didn't include in our request packet. 687 * If they want to negotiate about interface identifier, we comply. 688 * If they want us to ask for compression, we refuse. 689 */ 690 while (len > CILEN_VOID) { 691 GETCHAR(citype, p); 692 GETCHAR(cilen, p); 693 if( (len -= cilen) < 0 ) 694 goto bad; 695 next = p + cilen - 2; 696 697 switch (citype) { 698 case CI_COMPRESSTYPE: 699 if (go->neg_vj || no.neg_vj || 700 (cilen != CILEN_COMPRESS)) 701 goto bad; 702 no.neg_vj = 1; 703 break; 704 case CI_IFACEID: 705 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID) 706 goto bad; 707 try.neg_ifaceid = 1; 708 eui64_get(ifaceid, p); 709 if (go->accept_local) { 710 while (eui64_iszero(ifaceid) || 711 eui64_equals(ifaceid, go->hisid)) /* bad luck */ 712 eui64_magic(ifaceid); 713 try.ourid = ifaceid; 714 } 715 no.neg_ifaceid = 1; 716 break; 717 } 718 p = next; 719 } 720 721 /* If there is still anything left, this packet is bad. */ 722 if (len != 0) 723 goto bad; 724 725 /* 726 * OK, the Nak is good. Now we can update state. 727 */ 728 if (f->state != OPENED) 729 *go = try; 730 731 return 1; 732 733 bad: 734 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!")); 735 return 0; 736 } 737 738 739 /* 740 * ipv6cp_rejci - Reject some of our CIs. 741 */ 742 static int 743 ipv6cp_rejci(f, p, len) 744 fsm *f; 745 u_char *p; 746 int len; 747 { 748 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 749 u_char cilen; 750 u_short cishort; 751 eui64_t ifaceid; 752 ipv6cp_options try; /* options to request next time */ 753 754 try = *go; 755 /* 756 * Any Rejected CIs must be in exactly the same order that we sent. 757 * Check packet length and CI length at each step. 758 * If we find any deviations, then this packet is bad. 759 */ 760 #define REJCIIFACEID(opt, neg, val1) \ 761 if (go->neg && \ 762 len >= (cilen = CILEN_IFACEID) && \ 763 p[1] == cilen && \ 764 p[0] == opt) { \ 765 len -= cilen; \ 766 INCPTR(2, p); \ 767 eui64_get(ifaceid, p); \ 768 /* Check rejected value. */ \ 769 if (! eui64_equals(ifaceid, val1)) \ 770 goto bad; \ 771 try.neg = 0; \ 772 } 773 774 #define REJCIVJ(opt, neg, val) \ 775 if (go->neg && \ 776 p[1] == CILEN_COMPRESS && \ 777 len >= p[1] && \ 778 p[0] == opt) { \ 779 len -= p[1]; \ 780 INCPTR(2, p); \ 781 GETSHORT(cishort, p); \ 782 /* Check rejected value. */ \ 783 if (cishort != val) \ 784 goto bad; \ 785 try.neg = 0; \ 786 } 787 788 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid); 789 790 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol); 791 792 /* 793 * If there are any remaining CIs, then this packet is bad. 794 */ 795 if (len != 0) 796 goto bad; 797 /* 798 * Now we can update state. 799 */ 800 if (f->state != OPENED) 801 *go = try; 802 return 1; 803 804 bad: 805 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!")); 806 return 0; 807 } 808 809 810 /* 811 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response. 812 * 813 * Returns: CODE_CONFACK, CODE_CONFNAK or CODE_CONFREJ and input packet modified 814 * appropriately. If reject_if_disagree is non-zero, doesn't return 815 * CODE_CONFNAK; returns CODE_CONFREJ if it can't return CODE_CONFACK. 816 */ 817 static int 818 ipv6cp_reqci(f, p, lenp, dont_nak) 819 fsm *f; 820 u_char *p; /* Requested CIs */ 821 int *lenp; /* Length of requested CIs */ 822 int dont_nak; 823 { 824 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 825 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; 826 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit]; 827 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 828 u_char *p0, *nakp, *rejp, *prev; 829 int ret, newret; 830 int len, cilen, type; 831 eui64_t ifaceid; 832 u_short cishort; 833 834 ret = CODE_CONFACK; 835 rejp = p0 = p; 836 nakp = nak_buffer; 837 838 /* 839 * Reset all its options. 840 */ 841 BZERO(ho, sizeof(*ho)); 842 843 /* 844 * Process all its options. 845 */ 846 for (len = *lenp; len > 0; len -= cilen, p = prev + cilen) { 847 newret = CODE_CONFACK; 848 849 if ((len < 2) || p[1] > len) { 850 /* 851 * RFC 1661 page 40 -- if the option extends beyond the 852 * packet, then discard the entire packet. 853 */ 854 return (0); 855 } 856 857 prev = p; 858 GETCHAR(type, p); 859 GETCHAR(cilen, p); 860 861 switch (type) { /* Check CI type */ 862 case CI_IFACEID: 863 IPV6CPDEBUG(("ipv6cp: received interface identifier ")); 864 865 if (!ao->neg_ifaceid) { 866 newret = CODE_CONFREJ; 867 break; 868 } 869 870 if (cilen != CILEN_IFACEID) { 871 /* 872 * rfc1661, page 40 -- a recongnized option with an 873 * invalid length should be Nak'ed. 874 */ 875 newret = CODE_CONFNAK; 876 eui64_copy(wo->hisid, ifaceid); 877 } else { 878 879 /* 880 * If it has no interface identifier, or if we both 881 * have same identifier then NAK it with new idea. In 882 * particular, if we don't know its identifier, but it 883 * does, then accept that identifier. 884 */ 885 eui64_get(ifaceid, p); 886 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid))); 887 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) { 888 newret = CODE_CONFREJ; /* Reject CI */ 889 break; 890 } 891 /* If we don't like its ID, then nak that ID. */ 892 if (!eui64_iszero(wo->hisid) && 893 !eui64_equals(ifaceid, wo->hisid) && 894 eui64_iszero(go->hisid)) { 895 newret = CODE_CONFNAK; 896 eui64_copy(wo->hisid, ifaceid); 897 } else if (eui64_iszero(ifaceid) || 898 eui64_equals(ifaceid, go->ourid)) { 899 newret = CODE_CONFNAK; 900 /* first time, try option */ 901 if (eui64_iszero(go->hisid)) 902 eui64_copy(wo->hisid, ifaceid); 903 while (eui64_iszero(ifaceid) || 904 eui64_equals(ifaceid, go->ourid)) /* bad luck */ 905 eui64_magic(ifaceid); 906 } 907 } 908 if (newret == CODE_CONFNAK) { 909 PUTCHAR(type, nakp); 910 PUTCHAR(CILEN_IFACEID, nakp); 911 eui64_put(ifaceid, nakp); 912 } 913 914 ho->neg_ifaceid = 1; 915 eui64_copy(ifaceid, ho->hisid); 916 break; 917 918 case CI_COMPRESSTYPE: 919 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE ")); 920 921 if (!ao->neg_vj) { 922 newret = CODE_CONFREJ; 923 break; 924 } 925 926 if (cilen != CILEN_COMPRESS) { 927 newret = CODE_CONFNAK; 928 cishort = ao->vj_protocol; 929 } else { 930 GETSHORT(cishort, p); 931 IPV6CPDEBUG(("(%d)", cishort)); 932 933 #ifdef IPV6CP_COMP 934 if (cishort != IPV6CP_COMP) { 935 newret = CODE_CONFNAK; 936 cishort = IPV6CP_COMP; 937 } 938 #else 939 newret = CODE_CONFREJ; 940 break; 941 #endif 942 } 943 944 ho->neg_vj = 1; 945 ho->vj_protocol = cishort; 946 break; 947 948 default: 949 newret = CODE_CONFREJ; 950 break; 951 } 952 953 IPV6CPDEBUG((" (%s)\n", CODENAME(newret))); 954 955 /* Cope with confused peers. */ 956 if (cilen < 2) 957 cilen = 2; 958 959 /* 960 * If this is an Ack'able CI, but we're sending back a Nak, 961 * don't include this CI. 962 */ 963 if (newret == CODE_CONFACK && ret != CODE_CONFACK) 964 continue; 965 966 if (newret == CODE_CONFNAK) { 967 if (dont_nak) { 968 newret = CODE_CONFREJ; 969 } else { 970 /* Ignore subsequent Nak'able things if rejecting. */ 971 if (ret == CODE_CONFREJ) 972 continue; 973 ret = CODE_CONFNAK; 974 } 975 } 976 977 if (newret == CODE_CONFREJ) { 978 ret = CODE_CONFREJ; 979 if (prev != rejp) 980 (void) BCOPY(prev, rejp, cilen); 981 rejp += cilen; 982 } 983 } 984 985 /* 986 * If we aren't rejecting this packet, and we want to negotiate 987 * their identifier and they didn't send their identifier, then we 988 * send a NAK with a CI_IFACEID option appended. We assume the 989 * input buffer is long enough that we can append the extra 990 * option safely. 991 */ 992 if (ret != CODE_CONFREJ && !ho->neg_ifaceid && 993 wo->req_ifaceid && !dont_nak) { 994 if (ret == CODE_CONFACK) 995 wo->req_ifaceid = 0; 996 ret = CODE_CONFNAK; 997 PUTCHAR(CI_IFACEID, nakp); 998 PUTCHAR(CILEN_IFACEID, nakp); 999 eui64_put(wo->hisid, nakp); 1000 } 1001 1002 switch (ret) { 1003 case CODE_CONFACK: 1004 *lenp = p - p0; 1005 sys_block_proto(PPP_IPV6); 1006 break; 1007 case CODE_CONFNAK: 1008 *lenp = nakp - nak_buffer; 1009 (void) BCOPY(nak_buffer, p0, *lenp); 1010 break; 1011 case CODE_CONFREJ: 1012 *lenp = rejp - p0; 1013 break; 1014 } 1015 1016 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(ret))); 1017 return (ret); /* Return final code */ 1018 } 1019 1020 1021 /* 1022 * ipv6_check_options - check that any IP-related options are OK, 1023 * and assign appropriate defaults. 1024 */ 1025 static void 1026 ipv6_check_options() 1027 { 1028 ipv6cp_options *wo = &ipv6cp_wantoptions[0]; 1029 1030 #if defined(SOL2) 1031 /* 1032 * Persistent link-local id is only used when user has not explicitly 1033 * configure/hard-code the id 1034 */ 1035 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) { 1036 1037 /* 1038 * On systems where there are no Ethernet interfaces used, there 1039 * may be other ways to obtain a persistent id. Right now, it 1040 * will fall back to using magic [see eui64_magic] below when 1041 * an EUI-48 from MAC address can't be obtained. Other possibilities 1042 * include obtaining EEPROM serial numbers, or some other unique 1043 * yet persistent number. On Sparc platforms, this is possible, 1044 * but too bad there's no standards yet for x86 machines. 1045 */ 1046 if (ether_to_eui64(&wo->ourid)) { 1047 wo->opt_local = 1; 1048 } 1049 } 1050 #endif 1051 1052 /* 1053 * If ipv6cp-use-ipaddr is used, then both local and remote IPv4 1054 * addresses should be specified as options. Otherwise, since 1055 * ipcp has yet to negotiate the IPv4 addresses, the interface 1056 * identifiers will be based on meaningless values. 1057 */ 1058 if (wo->use_ip) { 1059 if ((ipcp_wantoptions[0].accept_local || 1060 ipcp_wantoptions[0].ouraddr == 0) && eui64_iszero(wo->ourid)) { 1061 warn("either IPv4 or IPv6 local address should be non-zero for ipv6cp-use-ipaddr"); 1062 } 1063 if ((ipcp_wantoptions[0].accept_remote || 1064 ipcp_wantoptions[0].hisaddr == 0) && eui64_iszero(wo->hisid)) { 1065 warn("either IPv4 or IPv6 remote address should be non-zero for ipv6cp-use-ipaddr"); 1066 } 1067 } 1068 1069 if (!wo->opt_local) { /* init interface identifier */ 1070 if (wo->use_ip && eui64_iszero(wo->ourid)) { 1071 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr)); 1072 if (!eui64_iszero(wo->ourid)) 1073 wo->opt_local = 1; 1074 } 1075 1076 while (eui64_iszero(wo->ourid)) 1077 eui64_magic(wo->ourid); 1078 } 1079 1080 if (!wo->opt_remote) { 1081 if (wo->use_ip && eui64_iszero(wo->hisid)) { 1082 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr)); 1083 if (!eui64_iszero(wo->hisid)) 1084 wo->opt_remote = 1; 1085 } 1086 } 1087 1088 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) { 1089 fatal("local/remote LL address required for demand-dialling\n"); 1090 } 1091 } 1092 1093 1094 /* 1095 * ipv6_demand_conf - configure the interface as though 1096 * IPV6CP were up, for use with dial-on-demand. 1097 */ 1098 static int 1099 ipv6_demand_conf(u) 1100 int u; 1101 { 1102 ipv6cp_options *wo = &ipv6cp_wantoptions[u]; 1103 1104 #if SIF6UPFIRST 1105 if (!sif6up(u)) 1106 return 0; 1107 #endif 1108 if (!sif6addr(u, wo->ourid, wo->hisid)) 1109 return 0; 1110 #if !SIF6UPFIRST 1111 if (!sif6up(u)) 1112 return 0; 1113 #endif 1114 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE)) 1115 return 0; 1116 1117 notice("local LL address %s", llv6_ntoa(wo->ourid)); 1118 notice("remote LL address %s", llv6_ntoa(wo->hisid)); 1119 1120 return 1; 1121 } 1122 1123 1124 /* 1125 * ipv6cp_up - IPV6CP has come UP. 1126 * 1127 * Configure the IPv6 network interface appropriately and bring it up. 1128 */ 1129 static void 1130 ipv6cp_up(f) 1131 fsm *f; 1132 { 1133 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; 1134 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; 1135 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; 1136 1137 IPV6CPDEBUG(("ipv6cp: up")); 1138 1139 /* 1140 * We must have a non-zero LL address for both ends of the link. 1141 */ 1142 if (!ho->neg_ifaceid) 1143 ho->hisid = wo->hisid; 1144 1145 if(!no_ifaceid_neg) { 1146 if (eui64_iszero(ho->hisid)) { 1147 error("Could not determine remote LL address"); 1148 ipv6cp_close(f->unit, "Could not determine remote LL address"); 1149 return; 1150 } 1151 if (eui64_iszero(go->ourid)) { 1152 error("Could not determine local LL address"); 1153 ipv6cp_close(f->unit, "Could not determine local LL address"); 1154 return; 1155 } 1156 if (eui64_equals(go->ourid, ho->hisid)) { 1157 error("local and remote LL addresses are equal"); 1158 ipv6cp_close(f->unit, "local and remote LL addresses are equal"); 1159 return; 1160 } 1161 } 1162 1163 #ifdef IPV6CP_COMP 1164 /* set tcp compression */ 1165 if (sif6comp(f->unit, ho->neg_vj) != 1) { 1166 ipv6cp_close(f->unit, "Could not enable TCP compression"); 1167 return; 1168 } 1169 #endif 1170 1171 /* 1172 * If we are doing dial-on-demand, the interface is already 1173 * configured, so we put out any saved-up packets, then set the 1174 * interface to pass IPv6 packets. 1175 */ 1176 if (demand) { 1177 if (! eui64_equals(go->ourid, wo->ourid) || 1178 ! eui64_equals(ho->hisid, wo->hisid)) { 1179 if (! eui64_equals(go->ourid, wo->ourid)) 1180 warn("Local LL address changed to %s", 1181 llv6_ntoa(go->ourid)); 1182 if (! eui64_equals(ho->hisid, wo->hisid)) 1183 warn("Remote LL address changed to %s", 1184 llv6_ntoa(ho->hisid)); 1185 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid); 1186 1187 /* Set the interface to the new addresses */ 1188 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1189 if (debug) 1190 warn("sif6addr failed"); 1191 ipv6cp_close(f->unit, "Interface configuration failed"); 1192 return; 1193 } 1194 1195 } 1196 demand_rexmit(PPP_IPV6); 1197 if (sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS) != 1) { 1198 ipv6cp_close(f->unit, "Interface configuration failed"); 1199 return; 1200 } 1201 1202 } else { 1203 /* 1204 * Set LL addresses 1205 */ 1206 #if !SIF6UPFIRST 1207 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1208 if (debug) 1209 warn("sif6addr failed"); 1210 ipv6cp_close(f->unit, "Interface configuration failed"); 1211 return; 1212 } 1213 #endif 1214 #if defined(SOL2) 1215 /* bring the interface up for IPv6 */ 1216 if (!sif6up(f->unit)) { 1217 if (debug) 1218 warn("sifup failed (IPV6)"); 1219 ipv6cp_close(f->unit, "Interface configuration failed"); 1220 return; 1221 } 1222 #else 1223 if (!sifup(f->unit)) { 1224 if (debug) 1225 warn("sifup failed (IPV6)"); 1226 ipv6cp_close(f->unit, "Interface configuration failed"); 1227 return; 1228 } 1229 #endif 1230 #if SIF6UPFIRST 1231 if (!sif6addr(f->unit, go->ourid, ho->hisid)) { 1232 if (debug) 1233 warn("sif6addr failed"); 1234 ipv6cp_close(f->unit, "Interface configuration failed"); 1235 return; 1236 } 1237 #endif 1238 if (sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS) != 1) { 1239 ipv6cp_close(f->unit, "Interface configuration failed"); 1240 return; 1241 } 1242 1243 notice("local LL address %s", llv6_ntoa(go->ourid)); 1244 notice("remote LL address %s", llv6_ntoa(ho->hisid)); 1245 } 1246 1247 np_up(f->unit, PPP_IPV6); 1248 ipv6cp_is_up = 1; 1249 1250 /* 1251 * Execute the ipv6-up script, like this: 1252 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL 1253 */ 1254 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0); 1255 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0); 1256 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) { 1257 ipv6cp_script_state = s_up; 1258 ipv6cp_script(_PATH_IPV6UP); 1259 } 1260 sys_unblock_proto(PPP_IPV6); 1261 } 1262 1263 1264 /* 1265 * ipv6cp_down - IPV6CP has gone DOWN. 1266 * 1267 * Take the IPv6 network interface down, clear its addresses 1268 * and delete routes through it. 1269 */ 1270 static void 1271 ipv6cp_down(f) 1272 fsm *f; 1273 { 1274 IPV6CPDEBUG(("ipv6cp: down")); 1275 update_link_stats(f->unit); 1276 if (ipv6cp_is_up) { 1277 ipv6cp_is_up = 0; 1278 np_down(f->unit, PPP_IPV6); 1279 } 1280 #ifdef IPV6CP_COMP 1281 if (sif6comp(f->unit, 0) != 1) { 1282 if (debug) 1283 warn("Failed to disable TCP compression."); 1284 } 1285 #endif 1286 1287 /* 1288 * If we are doing dial-on-demand, set the interface 1289 * to queue up outgoing packets (for now). 1290 */ 1291 if (demand) { 1292 if (sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE) != 1) { 1293 if (debug) 1294 warn("Failed to enable queueing on outgoing packets."); 1295 } 1296 } else { 1297 if (sifnpmode(f->unit, PPP_IPV6, NPMODE_ERROR) != 1) { 1298 if (debug) 1299 warn("Could not set interface to drop packets."); 1300 } 1301 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC))) 1302 #if defined(SOL2) 1303 if (sif6down(f->unit) != 1) 1304 warn("Couldn not bring interface down."); 1305 #else 1306 if (sifdown(f->unit) != 1) 1307 warn("Could not bring interface down."); 1308 #endif /* defined(SOL2) */ 1309 #endif 1310 ipv6cp_clear_addrs(f->unit, 1311 ipv6cp_gotoptions[f->unit].ourid, 1312 ipv6cp_hisoptions[f->unit].hisid); 1313 #if defined(__linux__) || (defined(SVR4) && (defined(SNI) || defined(__USLC))) 1314 if (sifdown(f->unit) != 1) 1315 warn("Could not bring interface down."); 1316 #endif 1317 } 1318 1319 /* Execute the ipv6-down script */ 1320 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) { 1321 ipv6cp_script_state = s_down; 1322 ipv6cp_script(_PATH_IPV6DOWN); 1323 } 1324 } 1325 1326 1327 /* 1328 * ipv6cp_clear_addrs() - clear the interface addresses, routes, 1329 * proxy neighbour discovery entries, etc. 1330 */ 1331 static void 1332 ipv6cp_clear_addrs(unit, ourid, hisid) 1333 int unit; 1334 eui64_t ourid; 1335 eui64_t hisid; 1336 { 1337 if (cif6addr(unit, ourid, hisid) != 1) 1338 warn("Could not clear addresses"); 1339 } 1340 1341 1342 /* 1343 * ipv6cp_finished - possibly shut down the lower layers. 1344 */ 1345 static void 1346 ipv6cp_finished(f) 1347 fsm *f; 1348 { 1349 np_finished(f->unit, PPP_IPV6); 1350 } 1351 1352 1353 /* 1354 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script 1355 * has finished. 1356 */ 1357 /*ARGSUSED*/ 1358 static void 1359 ipv6cp_script_done(arg, status) 1360 void *arg; 1361 int status; 1362 { 1363 ipv6cp_script_pid = 0; 1364 switch (ipv6cp_script_state) { 1365 case s_up: 1366 if (ipv6cp_fsm[0].state != OPENED) { 1367 ipv6cp_script_state = s_down; 1368 ipv6cp_script(_PATH_IPV6DOWN); 1369 } 1370 break; 1371 case s_down: 1372 if (ipv6cp_fsm[0].state == OPENED) { 1373 ipv6cp_script_state = s_up; 1374 ipv6cp_script(_PATH_IPV6UP); 1375 } 1376 break; 1377 } 1378 } 1379 1380 1381 /* 1382 * ipv6cp_script - Execute a script with arguments 1383 * interface-name tty-name speed local-LL remote-LL. 1384 */ 1385 static void 1386 ipv6cp_script(script) 1387 char *script; 1388 { 1389 char strspeed[32], strlocal[26], strremote[26]; 1390 char *argv[8]; 1391 1392 (void) slprintf(strspeed, sizeof (strspeed), "%d", baud_rate); 1393 (void) strlcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid), 1394 sizeof (strlocal)); 1395 (void) strlcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid), 1396 sizeof (strremote)); 1397 1398 argv[0] = script; 1399 argv[1] = ifname; 1400 argv[2] = devnam; 1401 argv[3] = strspeed; 1402 argv[4] = strlocal; 1403 argv[5] = strremote; 1404 argv[6] = ipparam; 1405 argv[7] = NULL; 1406 1407 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done, NULL); 1408 } 1409 1410 static int 1411 ipv6cp_printpkt(p, plen, printer, arg) 1412 u_char *p; 1413 int plen; 1414 void (*printer) __P((void *, const char *, ...)); 1415 void *arg; 1416 { 1417 int code, id, len, olen; 1418 u_char *pstart, *optend; 1419 u_short cishort; 1420 eui64_t ifaceid; 1421 1422 if (plen < HEADERLEN) 1423 return 0; 1424 pstart = p; 1425 GETCHAR(code, p); 1426 GETCHAR(id, p); 1427 GETSHORT(len, p); 1428 if (len < HEADERLEN || len > plen) 1429 return 0; 1430 1431 1432 printer(arg, " %s id=0x%x", code_name(code, 1), id); 1433 len -= HEADERLEN; 1434 switch (code) { 1435 case CODE_CONFREQ: 1436 case CODE_CONFACK: 1437 case CODE_CONFNAK: 1438 case CODE_CONFREJ: 1439 /* print option list */ 1440 while (len >= 2) { 1441 GETCHAR(code, p); 1442 GETCHAR(olen, p); 1443 p -= 2; 1444 if (olen < 2 || olen > len) { 1445 break; 1446 } 1447 printer(arg, " <"); 1448 len -= olen; 1449 optend = p + olen; 1450 switch (code) { 1451 case CI_COMPRESSTYPE: 1452 if (olen >= CILEN_COMPRESS) { 1453 p += 2; 1454 GETSHORT(cishort, p); 1455 printer(arg, "compress 0x%x", cishort); 1456 } 1457 break; 1458 case CI_IFACEID: 1459 if (olen == CILEN_IFACEID) { 1460 p += 2; 1461 eui64_get(ifaceid, p); 1462 printer(arg, "addr %s", llv6_ntoa(ifaceid)); 1463 } 1464 break; 1465 } 1466 printer(arg, "%8.*B>", optend-p, p); 1467 p = optend; 1468 } 1469 break; 1470 1471 case CODE_TERMACK: 1472 case CODE_TERMREQ: 1473 if (len > 0 && *p >= ' ' && *p < 0x7f) { 1474 printer(arg, " "); 1475 print_string((char *)p, len, printer, arg); 1476 p += len; 1477 len = 0; 1478 } 1479 break; 1480 } 1481 1482 /* print the rest of the bytes in the packet */ 1483 printer(arg, " %32.*B", len, p); 1484 1485 return p - pstart; 1486 } 1487 1488 /* 1489 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for. 1490 * We don't bring the link up for IP fragments or for TCP FIN packets 1491 * with no data. 1492 */ 1493 #define TCP_HDRLEN 20 1494 #define TH_FIN 0x01 1495 1496 static int 1497 ipv6_active_pkt(pkt, len) 1498 u_char *pkt; 1499 int len; 1500 { 1501 u_char *tcp; 1502 struct in6_addr addr; 1503 char fromstr[26]; 1504 char tostr[26]; 1505 1506 len -= PPP_HDRLEN; 1507 pkt += PPP_HDRLEN; 1508 if (len < IP6_HDRLEN) { 1509 dbglog("IPv6 packet of length %d is not activity", len); 1510 return 0; 1511 } 1512 (void) BCOPY(get_ip6src(pkt), &addr, sizeof (addr)); 1513 (void) inet_ntop(AF_INET6, &addr, fromstr, 26); 1514 (void) BCOPY(get_ip6dst(pkt), &addr, sizeof (addr)); 1515 (void) inet_ntop(AF_INET6, &addr, tostr, 26); 1516 if (get_ip6nh(pkt) == IPPROTO_FRAGMENT) { 1517 dbglog("IPv6 fragment from %s->%s is not activity", fromstr, tostr); 1518 return 0; 1519 } 1520 if (get_ip6nh(pkt) != IPPROTO_TCP) { 1521 info("IPv6 proto %d from %s->%s is activity", get_ip6nh(pkt), fromstr, 1522 tostr); 1523 return 1; 1524 } 1525 if (len < IP6_HDRLEN + TCP_HDRLEN) { 1526 dbglog("Bad TCP length %d<%d+%d %s->%s is not activity", len, 1527 IP6_HDRLEN, TCP_HDRLEN, fromstr, tostr); 1528 return 0; 1529 } 1530 tcp = pkt + IP6_HDRLEN; 1531 if ((get_tcpflags(tcp) & TH_FIN) != 0 && 1532 len == IP6_HDRLEN + get_tcpoff(tcp) * 4) { 1533 dbglog("Empty TCP FIN %s->%s is not activity", fromstr, tostr); 1534 return 0; 1535 } 1536 info("TCP %d data %s%s->%s is activity", len - IP6_HDRLEN - TCP_HDRLEN, 1537 tcp_flag_decode(get_tcpflags(tcp)), fromstr, tostr); 1538 return 1; 1539 } 1540