1 /* 2 * ipcp.c - PPP IP Control Protocol. 3 * 4 * Copyright (c) 1984-2000 Carnegie Mellon University. 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 "Carnegie Mellon University" must not be used to 19 * endorse or promote products derived from this software without 20 * prior written permission. For permission or any legal 21 * details, please contact 22 * Office of Technology Transfer 23 * Carnegie Mellon University 24 * 5000 Forbes Avenue 25 * Pittsburgh, PA 15213-3890 26 * (412) 268-4387, fax: (412) 268-7395 27 * tech-transfer (at) andrew.cmu.edu 28 * 29 * 4. Redistributions of any form whatsoever must retain the following 30 * acknowledgment: 31 * "This product includes software developed by Computing Services 32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 33 * 34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 35 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 38 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 41 */ 42 43 #define RCSID "$Id: ipcp.c,v 1.73 2008/05/26 08:33:22 paulus Exp $" 44 45 /* 46 * TODO: 47 */ 48 49 #include <stdio.h> 50 #include <string.h> 51 #include <stdlib.h> 52 #include <netdb.h> 53 #include <sys/param.h> 54 #include <sys/types.h> 55 #include <sys/socket.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 59 #include "pppd.h" 60 #include "fsm.h" 61 #include "ipcp.h" 62 #include "pathnames.h" 63 64 static const char rcsid[] = RCSID; 65 66 /* global vars */ 67 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ 68 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ 69 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ 70 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ 71 72 u_int32_t netmask = 0; /* IP netmask to set on interface */ 73 74 bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */ 75 bool noremoteip = 0; /* Let him have no IP address */ 76 77 /* Hook for a plugin to know when IP protocol has come up */ 78 void (*ip_up_hook) __P((void)) = NULL; 79 80 /* Hook for a plugin to know when IP protocol has come down */ 81 void (*ip_down_hook) __P((void)) = NULL; 82 83 /* Hook for a plugin to choose the remote IP address */ 84 void (*ip_choose_hook) __P((u_int32_t *)) = NULL; 85 86 /* Notifiers for when IPCP goes up and down */ 87 struct notifier *ip_up_notifier = NULL; 88 struct notifier *ip_down_notifier = NULL; 89 90 /* local vars */ 91 static int default_route_set[NUM_PPP]; /* Have set up a default route */ 92 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ 93 static bool usepeerdns; /* Ask peer for DNS addrs */ 94 static int ipcp_is_up; /* have called np_up() */ 95 static int ipcp_is_open; /* haven't called np_finished() */ 96 static bool ask_for_local; /* request our address from peer */ 97 static char vj_value[8]; /* string form of vj option value */ 98 static char netmask_str[20]; /* string form of netmask value */ 99 100 /* 101 * Callbacks for fsm code. (CI = Configuration Information) 102 */ 103 static void ipcp_resetci __P((fsm *)); /* Reset our CI */ 104 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */ 105 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ 106 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ 107 static int ipcp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */ 108 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ 109 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ 110 static void ipcp_up __P((fsm *)); /* We're UP */ 111 static void ipcp_down __P((fsm *)); /* We're DOWN */ 112 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */ 113 114 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ 115 116 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ 117 ipcp_resetci, /* Reset our Configuration Information */ 118 ipcp_cilen, /* Length of our Configuration Information */ 119 ipcp_addci, /* Add our Configuration Information */ 120 ipcp_ackci, /* ACK our Configuration Information */ 121 ipcp_nakci, /* NAK our Configuration Information */ 122 ipcp_rejci, /* Reject our Configuration Information */ 123 ipcp_reqci, /* Request peer's Configuration Information */ 124 ipcp_up, /* Called when fsm reaches OPENED state */ 125 ipcp_down, /* Called when fsm leaves OPENED state */ 126 NULL, /* Called when we want the lower layer up */ 127 ipcp_finished, /* Called when we want the lower layer down */ 128 NULL, /* Called when Protocol-Reject received */ 129 NULL, /* Retransmission is necessary */ 130 NULL, /* Called to handle protocol-specific codes */ 131 "IPCP" /* String name of protocol */ 132 }; 133 134 /* 135 * Command-line options. 136 */ 137 static int setvjslots __P((char **)); 138 static int setdnsaddr __P((char **)); 139 static int setwinsaddr __P((char **)); 140 static int setnetmask __P((char **)); 141 int setipaddr __P((char *, char **, int)); 142 static void printipaddr __P((option_t *, void (*)(void *, char *,...),void *)); 143 144 static option_t ipcp_option_list[] = { 145 { "noip", o_bool, &ipcp_protent.enabled_flag, 146 "Disable IP and IPCP" }, 147 { "-ip", o_bool, &ipcp_protent.enabled_flag, 148 "Disable IP and IPCP", OPT_ALIAS }, 149 150 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj, 151 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj }, 152 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj, 153 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR, 154 &ipcp_allowoptions[0].neg_vj }, 155 156 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag, 157 "Disable VJ connection-ID compression", OPT_A2CLR, 158 &ipcp_allowoptions[0].cflag }, 159 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag, 160 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR, 161 &ipcp_allowoptions[0].cflag }, 162 163 { "vj-max-slots", o_special, (void *)setvjslots, 164 "Set maximum VJ header slots", 165 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value }, 166 167 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local, 168 "Accept peer's address for us", 1 }, 169 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote, 170 "Accept peer's address for it", 1 }, 171 172 { "ipparam", o_string, &ipparam, 173 "Set ip script parameter", OPT_PRIO }, 174 175 { "noipdefault", o_bool, &disable_defaultip, 176 "Don't use name for default IP adrs", 1 }, 177 178 { "ms-dns", 1, (void *)setdnsaddr, 179 "DNS address for the peer's use" }, 180 { "ms-wins", 1, (void *)setwinsaddr, 181 "Nameserver for SMB over TCP/IP for peer" }, 182 183 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime, 184 "Set timeout for IPCP", OPT_PRIO }, 185 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits, 186 "Set max #xmits for term-reqs", OPT_PRIO }, 187 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits, 188 "Set max #xmits for conf-reqs", OPT_PRIO }, 189 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops, 190 "Set max #conf-naks for IPCP", OPT_PRIO }, 191 192 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route, 193 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route }, 194 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route, 195 "disable defaultroute option", OPT_A2CLR, 196 &ipcp_wantoptions[0].default_route }, 197 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route, 198 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR, 199 &ipcp_wantoptions[0].default_route }, 200 201 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp, 202 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp }, 203 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, 204 "disable proxyarp option", OPT_A2CLR, 205 &ipcp_wantoptions[0].proxy_arp }, 206 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, 207 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR, 208 &ipcp_wantoptions[0].proxy_arp }, 209 210 { "usepeerdns", o_bool, &usepeerdns, 211 "Ask peer for DNS address(es)", 1 }, 212 213 { "netmask", o_special, (void *)setnetmask, 214 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str }, 215 216 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs, 217 "Disable old-style IP-Addresses usage", OPT_A2CLR, 218 &ipcp_allowoptions[0].old_addrs }, 219 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr, 220 "Disable IP-Address usage", OPT_A2CLR, 221 &ipcp_allowoptions[0].neg_addr }, 222 #ifdef __linux__ 223 { "noremoteip", o_bool, &noremoteip, 224 "Allow peer to have no IP address", 1 }, 225 #endif 226 { "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr, 227 "Don't send our IP address to peer", OPT_A2CLR, 228 &ipcp_wantoptions[0].old_addrs}, 229 230 { "IP addresses", o_wild, (void *) &setipaddr, 231 "set local and remote IP addresses", 232 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr }, 233 234 { NULL } 235 }; 236 237 /* 238 * Protocol entry points from main code. 239 */ 240 static void ipcp_init __P((int)); 241 static void ipcp_open __P((int)); 242 static void ipcp_close __P((int, char *)); 243 static void ipcp_lowerup __P((int)); 244 static void ipcp_lowerdown __P((int)); 245 static void ipcp_input __P((int, u_char *, int)); 246 static void ipcp_protrej __P((int)); 247 static int ipcp_printpkt __P((u_char *, int, 248 void (*) __P((void *, char *, ...)), void *)); 249 static void ip_check_options __P((void)); 250 static int ip_demand_conf __P((int)); 251 static int ip_active_pkt __P((u_char *, int)); 252 static void create_resolv __P((u_int32_t, u_int32_t)); 253 254 struct protent ipcp_protent = { 255 PPP_IPCP, 256 ipcp_init, 257 ipcp_input, 258 ipcp_protrej, 259 ipcp_lowerup, 260 ipcp_lowerdown, 261 ipcp_open, 262 ipcp_close, 263 ipcp_printpkt, 264 NULL, 265 1, 266 "IPCP", 267 "IP", 268 ipcp_option_list, 269 ip_check_options, 270 ip_demand_conf, 271 ip_active_pkt 272 }; 273 274 static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t)); 275 static void ipcp_script __P((char *, int)); /* Run an up/down script */ 276 static void ipcp_script_done __P((void *)); 277 278 /* 279 * Lengths of configuration options. 280 */ 281 #define CILEN_VOID 2 282 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ 283 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ 284 #define CILEN_ADDR 6 /* new-style single address option */ 285 #define CILEN_ADDRS 10 /* old-style dual address option */ 286 287 288 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ 289 (x) == CONFNAK ? "NAK" : "REJ") 290 291 /* 292 * This state variable is used to ensure that we don't 293 * run an ipcp-up/down script while one is already running. 294 */ 295 static enum script_state { 296 s_down, 297 s_up, 298 } ipcp_script_state; 299 static pid_t ipcp_script_pid; 300 301 /* 302 * Make a string representation of a network IP address. 303 */ 304 char * 305 ip_ntoa(ipaddr) 306 u_int32_t ipaddr; 307 { 308 static char b[64]; 309 310 slprintf(b, sizeof(b), "%I", ipaddr); 311 return b; 312 } 313 314 /* 315 * Option parsing. 316 */ 317 318 /* 319 * setvjslots - set maximum number of connection slots for VJ compression 320 */ 321 static int 322 setvjslots(argv) 323 char **argv; 324 { 325 int value; 326 327 if (!int_option(*argv, &value)) 328 return 0; 329 if (value < 2 || value > 16) { 330 option_error("vj-max-slots value must be between 2 and 16"); 331 return 0; 332 } 333 ipcp_wantoptions [0].maxslotindex = 334 ipcp_allowoptions[0].maxslotindex = value - 1; 335 slprintf(vj_value, sizeof(vj_value), "%d", value); 336 return 1; 337 } 338 339 /* 340 * setdnsaddr - set the dns address(es) 341 */ 342 static int 343 setdnsaddr(argv) 344 char **argv; 345 { 346 u_int32_t dns; 347 struct hostent *hp; 348 349 dns = inet_addr(*argv); 350 if (dns == (u_int32_t) -1) { 351 if ((hp = gethostbyname(*argv)) == NULL) { 352 option_error("invalid address parameter '%s' for ms-dns option", 353 *argv); 354 return 0; 355 } 356 dns = *(u_int32_t *)hp->h_addr; 357 } 358 359 /* We take the last 2 values given, the 2nd-last as the primary 360 and the last as the secondary. If only one is given it 361 becomes both primary and secondary. */ 362 if (ipcp_allowoptions[0].dnsaddr[1] == 0) 363 ipcp_allowoptions[0].dnsaddr[0] = dns; 364 else 365 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1]; 366 367 /* always set the secondary address value. */ 368 ipcp_allowoptions[0].dnsaddr[1] = dns; 369 370 return (1); 371 } 372 373 /* 374 * setwinsaddr - set the wins address(es) 375 * This is primrarly used with the Samba package under UNIX or for pointing 376 * the caller to the existing WINS server on a Windows NT platform. 377 */ 378 static int 379 setwinsaddr(argv) 380 char **argv; 381 { 382 u_int32_t wins; 383 struct hostent *hp; 384 385 wins = inet_addr(*argv); 386 if (wins == (u_int32_t) -1) { 387 if ((hp = gethostbyname(*argv)) == NULL) { 388 option_error("invalid address parameter '%s' for ms-wins option", 389 *argv); 390 return 0; 391 } 392 wins = *(u_int32_t *)hp->h_addr; 393 } 394 395 /* We take the last 2 values given, the 2nd-last as the primary 396 and the last as the secondary. If only one is given it 397 becomes both primary and secondary. */ 398 if (ipcp_allowoptions[0].winsaddr[1] == 0) 399 ipcp_allowoptions[0].winsaddr[0] = wins; 400 else 401 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1]; 402 403 /* always set the secondary address value. */ 404 ipcp_allowoptions[0].winsaddr[1] = wins; 405 406 return (1); 407 } 408 409 /* 410 * setipaddr - Set the IP address 411 * If doit is 0, the call is to check whether this option is 412 * potentially an IP address specification. 413 * Not static so that plugins can call it to set the addresses 414 */ 415 int 416 setipaddr(arg, argv, doit) 417 char *arg; 418 char **argv; 419 int doit; 420 { 421 struct hostent *hp; 422 char *colon; 423 u_int32_t local, remote; 424 ipcp_options *wo = &ipcp_wantoptions[0]; 425 static int prio_local = 0, prio_remote = 0; 426 427 /* 428 * IP address pair separated by ":". 429 */ 430 if ((colon = strchr(arg, ':')) == NULL) 431 return 0; 432 if (!doit) 433 return 1; 434 435 /* 436 * If colon first character, then no local addr. 437 */ 438 if (colon != arg && option_priority >= prio_local) { 439 *colon = '\0'; 440 if ((local = inet_addr(arg)) == (u_int32_t) -1) { 441 if ((hp = gethostbyname(arg)) == NULL) { 442 option_error("unknown host: %s", arg); 443 return 0; 444 } 445 local = *(u_int32_t *)hp->h_addr; 446 } 447 if (bad_ip_adrs(local)) { 448 option_error("bad local IP address %s", ip_ntoa(local)); 449 return 0; 450 } 451 if (local != 0) 452 wo->ouraddr = local; 453 *colon = ':'; 454 prio_local = option_priority; 455 } 456 457 /* 458 * If colon last character, then no remote addr. 459 */ 460 if (*++colon != '\0' && option_priority >= prio_remote) { 461 if ((remote = inet_addr(colon)) == (u_int32_t) -1) { 462 if ((hp = gethostbyname(colon)) == NULL) { 463 option_error("unknown host: %s", colon); 464 return 0; 465 } 466 remote = *(u_int32_t *)hp->h_addr; 467 if (remote_name[0] == 0) 468 strlcpy(remote_name, colon, sizeof(remote_name)); 469 } 470 if (bad_ip_adrs(remote)) { 471 option_error("bad remote IP address %s", ip_ntoa(remote)); 472 return 0; 473 } 474 if (remote != 0) 475 wo->hisaddr = remote; 476 prio_remote = option_priority; 477 } 478 479 return 1; 480 } 481 482 static void 483 printipaddr(opt, printer, arg) 484 option_t *opt; 485 void (*printer) __P((void *, char *, ...)); 486 void *arg; 487 { 488 ipcp_options *wo = &ipcp_wantoptions[0]; 489 490 if (wo->ouraddr != 0) 491 printer(arg, "%I", wo->ouraddr); 492 printer(arg, ":"); 493 if (wo->hisaddr != 0) 494 printer(arg, "%I", wo->hisaddr); 495 } 496 497 /* 498 * setnetmask - set the netmask to be used on the interface. 499 */ 500 static int 501 setnetmask(argv) 502 char **argv; 503 { 504 u_int32_t mask; 505 int n; 506 char *p; 507 508 /* 509 * Unfortunately, if we use inet_addr, we can't tell whether 510 * a result of all 1s is an error or a valid 255.255.255.255. 511 */ 512 p = *argv; 513 n = parse_dotted_ip(p, &mask); 514 515 mask = htonl(mask); 516 517 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) { 518 option_error("invalid netmask value '%s'", *argv); 519 return 0; 520 } 521 522 netmask = mask; 523 slprintf(netmask_str, sizeof(netmask_str), "%I", mask); 524 525 return (1); 526 } 527 528 int 529 parse_dotted_ip(p, vp) 530 char *p; 531 u_int32_t *vp; 532 { 533 int n; 534 u_int32_t v, b; 535 char *endp, *p0 = p; 536 537 v = 0; 538 for (n = 3;; --n) { 539 b = strtoul(p, &endp, 0); 540 if (endp == p) 541 return 0; 542 if (b > 255) { 543 if (n < 3) 544 return 0; 545 /* accept e.g. 0xffffff00 */ 546 *vp = b; 547 return endp - p0; 548 } 549 v |= b << (n * 8); 550 p = endp; 551 if (n == 0) 552 break; 553 if (*p != '.') 554 return 0; 555 ++p; 556 } 557 *vp = v; 558 return p - p0; 559 } 560 561 562 /* 563 * ipcp_init - Initialize IPCP. 564 */ 565 static void 566 ipcp_init(unit) 567 int unit; 568 { 569 fsm *f = &ipcp_fsm[unit]; 570 ipcp_options *wo = &ipcp_wantoptions[unit]; 571 ipcp_options *ao = &ipcp_allowoptions[unit]; 572 573 f->unit = unit; 574 f->protocol = PPP_IPCP; 575 f->callbacks = &ipcp_callbacks; 576 fsm_init(&ipcp_fsm[unit]); 577 578 /* 579 * Some 3G modems use repeated IPCP NAKs as a way of stalling 580 * until they can contact a server on the network, so we increase 581 * the default number of NAKs we accept before we start treating 582 * them as rejects. 583 */ 584 f->maxnakloops = 100; 585 586 memset(wo, 0, sizeof(*wo)); 587 memset(ao, 0, sizeof(*ao)); 588 589 wo->neg_addr = wo->old_addrs = 1; 590 wo->neg_vj = 1; 591 wo->vj_protocol = IPCP_VJ_COMP; 592 wo->maxslotindex = MAX_STATES - 1; /* really max index */ 593 wo->cflag = 1; 594 595 596 /* max slots and slot-id compression are currently hardwired in */ 597 /* ppp_if.c to 16 and 1, this needs to be changed (among other */ 598 /* things) gmc */ 599 600 ao->neg_addr = ao->old_addrs = 1; 601 ao->neg_vj = 1; 602 ao->maxslotindex = MAX_STATES - 1; 603 ao->cflag = 1; 604 605 /* 606 * XXX These control whether the user may use the proxyarp 607 * and defaultroute options. 608 */ 609 ao->proxy_arp = 1; 610 ao->default_route = 1; 611 } 612 613 614 /* 615 * ipcp_open - IPCP is allowed to come up. 616 */ 617 static void 618 ipcp_open(unit) 619 int unit; 620 { 621 fsm_open(&ipcp_fsm[unit]); 622 ipcp_is_open = 1; 623 } 624 625 626 /* 627 * ipcp_close - Take IPCP down. 628 */ 629 static void 630 ipcp_close(unit, reason) 631 int unit; 632 char *reason; 633 { 634 fsm_close(&ipcp_fsm[unit], reason); 635 } 636 637 638 /* 639 * ipcp_lowerup - The lower layer is up. 640 */ 641 static void 642 ipcp_lowerup(unit) 643 int unit; 644 { 645 fsm_lowerup(&ipcp_fsm[unit]); 646 } 647 648 649 /* 650 * ipcp_lowerdown - The lower layer is down. 651 */ 652 static void 653 ipcp_lowerdown(unit) 654 int unit; 655 { 656 fsm_lowerdown(&ipcp_fsm[unit]); 657 } 658 659 660 /* 661 * ipcp_input - Input IPCP packet. 662 */ 663 static void 664 ipcp_input(unit, p, len) 665 int unit; 666 u_char *p; 667 int len; 668 { 669 fsm_input(&ipcp_fsm[unit], p, len); 670 } 671 672 673 /* 674 * ipcp_protrej - A Protocol-Reject was received for IPCP. 675 * 676 * Pretend the lower layer went down, so we shut up. 677 */ 678 static void 679 ipcp_protrej(unit) 680 int unit; 681 { 682 fsm_lowerdown(&ipcp_fsm[unit]); 683 } 684 685 686 /* 687 * ipcp_resetci - Reset our CI. 688 * Called by fsm_sconfreq, Send Configure Request. 689 */ 690 static void 691 ipcp_resetci(f) 692 fsm *f; 693 { 694 ipcp_options *wo = &ipcp_wantoptions[f->unit]; 695 ipcp_options *go = &ipcp_gotoptions[f->unit]; 696 ipcp_options *ao = &ipcp_allowoptions[f->unit]; 697 698 wo->req_addr = (wo->neg_addr || wo->old_addrs) && 699 (ao->neg_addr || ao->old_addrs); 700 if (wo->ouraddr == 0) 701 wo->accept_local = 1; 702 if (wo->hisaddr == 0) 703 wo->accept_remote = 1; 704 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */ 705 wo->req_dns2 = usepeerdns; 706 *go = *wo; 707 if (!ask_for_local) 708 go->ouraddr = 0; 709 if (ip_choose_hook) { 710 ip_choose_hook(&wo->hisaddr); 711 if (wo->hisaddr) { 712 wo->accept_remote = 0; 713 } 714 } 715 BZERO(&ipcp_hisoptions[f->unit], sizeof(ipcp_options)); 716 } 717 718 719 /* 720 * ipcp_cilen - Return length of our CI. 721 * Called by fsm_sconfreq, Send Configure Request. 722 */ 723 static int 724 ipcp_cilen(f) 725 fsm *f; 726 { 727 ipcp_options *go = &ipcp_gotoptions[f->unit]; 728 ipcp_options *wo = &ipcp_wantoptions[f->unit]; 729 ipcp_options *ho = &ipcp_hisoptions[f->unit]; 730 731 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0) 732 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) 733 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0) 734 #define LENCIDNS(neg) LENCIADDR(neg) 735 #define LENCIWINS(neg) LENCIADDR(neg) 736 737 /* 738 * First see if we want to change our options to the old 739 * forms because we have received old forms from the peer. 740 */ 741 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs) 742 go->neg_addr = 0; 743 if (wo->neg_vj && !go->neg_vj && !go->old_vj) { 744 /* try an older style of VJ negotiation */ 745 /* use the old style only if the peer did */ 746 if (ho->neg_vj && ho->old_vj) { 747 go->neg_vj = 1; 748 go->old_vj = 1; 749 go->vj_protocol = ho->vj_protocol; 750 } 751 } 752 753 return (LENCIADDRS(!go->neg_addr && go->old_addrs) + 754 LENCIVJ(go->neg_vj, go->old_vj) + 755 LENCIADDR(go->neg_addr) + 756 LENCIDNS(go->req_dns1) + 757 LENCIDNS(go->req_dns2) + 758 LENCIWINS(go->winsaddr[0]) + 759 LENCIWINS(go->winsaddr[1])) ; 760 } 761 762 763 /* 764 * ipcp_addci - Add our desired CIs to a packet. 765 * Called by fsm_sconfreq, Send Configure Request. 766 */ 767 static void 768 ipcp_addci(f, ucp, lenp) 769 fsm *f; 770 u_char *ucp; 771 int *lenp; 772 { 773 ipcp_options *go = &ipcp_gotoptions[f->unit]; 774 int len = *lenp; 775 776 #define ADDCIADDRS(opt, neg, val1, val2) \ 777 if (neg) { \ 778 if (len >= CILEN_ADDRS) { \ 779 u_int32_t l; \ 780 PUTCHAR(opt, ucp); \ 781 PUTCHAR(CILEN_ADDRS, ucp); \ 782 l = ntohl(val1); \ 783 PUTLONG(l, ucp); \ 784 l = ntohl(val2); \ 785 PUTLONG(l, ucp); \ 786 len -= CILEN_ADDRS; \ 787 } else \ 788 go->old_addrs = 0; \ 789 } 790 791 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ 792 if (neg) { \ 793 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ 794 if (len >= vjlen) { \ 795 PUTCHAR(opt, ucp); \ 796 PUTCHAR(vjlen, ucp); \ 797 PUTSHORT(val, ucp); \ 798 if (!old) { \ 799 PUTCHAR(maxslotindex, ucp); \ 800 PUTCHAR(cflag, ucp); \ 801 } \ 802 len -= vjlen; \ 803 } else \ 804 neg = 0; \ 805 } 806 807 #define ADDCIADDR(opt, neg, val) \ 808 if (neg) { \ 809 if (len >= CILEN_ADDR) { \ 810 u_int32_t l; \ 811 PUTCHAR(opt, ucp); \ 812 PUTCHAR(CILEN_ADDR, ucp); \ 813 l = ntohl(val); \ 814 PUTLONG(l, ucp); \ 815 len -= CILEN_ADDR; \ 816 } else \ 817 neg = 0; \ 818 } 819 820 #define ADDCIDNS(opt, neg, addr) \ 821 if (neg) { \ 822 if (len >= CILEN_ADDR) { \ 823 u_int32_t l; \ 824 PUTCHAR(opt, ucp); \ 825 PUTCHAR(CILEN_ADDR, ucp); \ 826 l = ntohl(addr); \ 827 PUTLONG(l, ucp); \ 828 len -= CILEN_ADDR; \ 829 } else \ 830 neg = 0; \ 831 } 832 833 #define ADDCIWINS(opt, addr) \ 834 if (addr) { \ 835 if (len >= CILEN_ADDR) { \ 836 u_int32_t l; \ 837 PUTCHAR(opt, ucp); \ 838 PUTCHAR(CILEN_ADDR, ucp); \ 839 l = ntohl(addr); \ 840 PUTLONG(l, ucp); \ 841 len -= CILEN_ADDR; \ 842 } else \ 843 addr = 0; \ 844 } 845 846 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, 847 go->hisaddr); 848 849 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, 850 go->maxslotindex, go->cflag); 851 852 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); 853 854 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); 855 856 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); 857 858 ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]); 859 860 ADDCIWINS(CI_MS_WINS2, go->winsaddr[1]); 861 862 *lenp -= len; 863 } 864 865 866 /* 867 * ipcp_ackci - Ack our CIs. 868 * Called by fsm_rconfack, Receive Configure ACK. 869 * 870 * Returns: 871 * 0 - Ack was bad. 872 * 1 - Ack was good. 873 */ 874 static int 875 ipcp_ackci(f, p, len) 876 fsm *f; 877 u_char *p; 878 int len; 879 { 880 ipcp_options *go = &ipcp_gotoptions[f->unit]; 881 u_short cilen, citype, cishort; 882 u_int32_t cilong; 883 u_char cimaxslotindex, cicflag; 884 885 /* 886 * CIs must be in exactly the same order that we sent... 887 * Check packet length and CI length at each step. 888 * If we find any deviations, then this packet is bad. 889 */ 890 891 #define ACKCIADDRS(opt, neg, val1, val2) \ 892 if (neg) { \ 893 u_int32_t l; \ 894 if ((len -= CILEN_ADDRS) < 0) \ 895 goto bad; \ 896 GETCHAR(citype, p); \ 897 GETCHAR(cilen, p); \ 898 if (cilen != CILEN_ADDRS || \ 899 citype != opt) \ 900 goto bad; \ 901 GETLONG(l, p); \ 902 cilong = htonl(l); \ 903 if (val1 != cilong) \ 904 goto bad; \ 905 GETLONG(l, p); \ 906 cilong = htonl(l); \ 907 if (val2 != cilong) \ 908 goto bad; \ 909 } 910 911 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ 912 if (neg) { \ 913 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ 914 if ((len -= vjlen) < 0) \ 915 goto bad; \ 916 GETCHAR(citype, p); \ 917 GETCHAR(cilen, p); \ 918 if (cilen != vjlen || \ 919 citype != opt) \ 920 goto bad; \ 921 GETSHORT(cishort, p); \ 922 if (cishort != val) \ 923 goto bad; \ 924 if (!old) { \ 925 GETCHAR(cimaxslotindex, p); \ 926 if (cimaxslotindex != maxslotindex) \ 927 goto bad; \ 928 GETCHAR(cicflag, p); \ 929 if (cicflag != cflag) \ 930 goto bad; \ 931 } \ 932 } 933 934 #define ACKCIADDR(opt, neg, val) \ 935 if (neg) { \ 936 u_int32_t l; \ 937 if ((len -= CILEN_ADDR) < 0) \ 938 goto bad; \ 939 GETCHAR(citype, p); \ 940 GETCHAR(cilen, p); \ 941 if (cilen != CILEN_ADDR || \ 942 citype != opt) \ 943 goto bad; \ 944 GETLONG(l, p); \ 945 cilong = htonl(l); \ 946 if (val != cilong) \ 947 goto bad; \ 948 } 949 950 #define ACKCIDNS(opt, neg, addr) \ 951 if (neg) { \ 952 u_int32_t l; \ 953 if ((len -= CILEN_ADDR) < 0) \ 954 goto bad; \ 955 GETCHAR(citype, p); \ 956 GETCHAR(cilen, p); \ 957 if (cilen != CILEN_ADDR || citype != opt) \ 958 goto bad; \ 959 GETLONG(l, p); \ 960 cilong = htonl(l); \ 961 if (addr != cilong) \ 962 goto bad; \ 963 } 964 965 #define ACKCIWINS(opt, addr) \ 966 if (addr) { \ 967 u_int32_t l; \ 968 if ((len -= CILEN_ADDR) < 0) \ 969 goto bad; \ 970 GETCHAR(citype, p); \ 971 GETCHAR(cilen, p); \ 972 if (cilen != CILEN_ADDR || citype != opt) \ 973 goto bad; \ 974 GETLONG(l, p); \ 975 cilong = htonl(l); \ 976 if (addr != cilong) \ 977 goto bad; \ 978 } 979 980 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, 981 go->hisaddr); 982 983 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, 984 go->maxslotindex, go->cflag); 985 986 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); 987 988 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); 989 990 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); 991 992 ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]); 993 994 ACKCIWINS(CI_MS_WINS2, go->winsaddr[1]); 995 996 /* 997 * If there are any remaining CIs, then this packet is bad. 998 */ 999 if (len != 0) 1000 goto bad; 1001 return (1); 1002 1003 bad: 1004 IPCPDEBUG(("ipcp_ackci: received bad Ack!")); 1005 return (0); 1006 } 1007 1008 /* 1009 * ipcp_nakci - Peer has sent a NAK for some of our CIs. 1010 * This should not modify any state if the Nak is bad 1011 * or if IPCP is in the OPENED state. 1012 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. 1013 * 1014 * Returns: 1015 * 0 - Nak was bad. 1016 * 1 - Nak was good. 1017 */ 1018 static int 1019 ipcp_nakci(f, p, len, treat_as_reject) 1020 fsm *f; 1021 u_char *p; 1022 int len; 1023 int treat_as_reject; 1024 { 1025 ipcp_options *go = &ipcp_gotoptions[f->unit]; 1026 u_char cimaxslotindex, cicflag; 1027 u_char citype, cilen, *next; 1028 u_short cishort; 1029 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr; 1030 ipcp_options no; /* options we've seen Naks for */ 1031 ipcp_options try; /* options to request next time */ 1032 1033 BZERO(&no, sizeof(no)); 1034 try = *go; 1035 1036 /* 1037 * Any Nak'd CIs must be in exactly the same order that we sent. 1038 * Check packet length and CI length at each step. 1039 * If we find any deviations, then this packet is bad. 1040 */ 1041 #define NAKCIADDRS(opt, neg, code) \ 1042 if ((neg) && \ 1043 (cilen = p[1]) == CILEN_ADDRS && \ 1044 len >= cilen && \ 1045 p[0] == opt) { \ 1046 len -= cilen; \ 1047 INCPTR(2, p); \ 1048 GETLONG(l, p); \ 1049 ciaddr1 = htonl(l); \ 1050 GETLONG(l, p); \ 1051 ciaddr2 = htonl(l); \ 1052 no.old_addrs = 1; \ 1053 code \ 1054 } 1055 1056 #define NAKCIVJ(opt, neg, code) \ 1057 if (go->neg && \ 1058 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ 1059 len >= cilen && \ 1060 p[0] == opt) { \ 1061 len -= cilen; \ 1062 INCPTR(2, p); \ 1063 GETSHORT(cishort, p); \ 1064 no.neg = 1; \ 1065 code \ 1066 } 1067 1068 #define NAKCIADDR(opt, neg, code) \ 1069 if (go->neg && \ 1070 (cilen = p[1]) == CILEN_ADDR && \ 1071 len >= cilen && \ 1072 p[0] == opt) { \ 1073 len -= cilen; \ 1074 INCPTR(2, p); \ 1075 GETLONG(l, p); \ 1076 ciaddr1 = htonl(l); \ 1077 no.neg = 1; \ 1078 code \ 1079 } 1080 1081 #define NAKCIDNS(opt, neg, code) \ 1082 if (go->neg && \ 1083 ((cilen = p[1]) == CILEN_ADDR) && \ 1084 len >= cilen && \ 1085 p[0] == opt) { \ 1086 len -= cilen; \ 1087 INCPTR(2, p); \ 1088 GETLONG(l, p); \ 1089 cidnsaddr = htonl(l); \ 1090 no.neg = 1; \ 1091 code \ 1092 } 1093 1094 /* 1095 * Accept the peer's idea of {our,his} address, if different 1096 * from our idea, only if the accept_{local,remote} flag is set. 1097 */ 1098 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, 1099 if (treat_as_reject) { 1100 try.old_addrs = 0; 1101 } else { 1102 if (go->accept_local && ciaddr1) { 1103 /* take his idea of our address */ 1104 try.ouraddr = ciaddr1; 1105 } 1106 if (go->accept_remote && ciaddr2) { 1107 /* take his idea of his address */ 1108 try.hisaddr = ciaddr2; 1109 } 1110 } 1111 ); 1112 1113 /* 1114 * Accept the peer's value of maxslotindex provided that it 1115 * is less than what we asked for. Turn off slot-ID compression 1116 * if the peer wants. Send old-style compress-type option if 1117 * the peer wants. 1118 */ 1119 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 1120 if (treat_as_reject) { 1121 try.neg_vj = 0; 1122 } else if (cilen == CILEN_VJ) { 1123 GETCHAR(cimaxslotindex, p); 1124 GETCHAR(cicflag, p); 1125 if (cishort == IPCP_VJ_COMP) { 1126 try.old_vj = 0; 1127 if (cimaxslotindex < go->maxslotindex) 1128 try.maxslotindex = cimaxslotindex; 1129 if (!cicflag) 1130 try.cflag = 0; 1131 } else { 1132 try.neg_vj = 0; 1133 } 1134 } else { 1135 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { 1136 try.old_vj = 1; 1137 try.vj_protocol = cishort; 1138 } else { 1139 try.neg_vj = 0; 1140 } 1141 } 1142 ); 1143 1144 NAKCIADDR(CI_ADDR, neg_addr, 1145 if (treat_as_reject) { 1146 try.neg_addr = 0; 1147 try.old_addrs = 0; 1148 } else if (go->accept_local && ciaddr1) { 1149 /* take his idea of our address */ 1150 try.ouraddr = ciaddr1; 1151 } 1152 ); 1153 1154 NAKCIDNS(CI_MS_DNS1, req_dns1, 1155 if (treat_as_reject) { 1156 try.req_dns1 = 0; 1157 } else { 1158 try.dnsaddr[0] = cidnsaddr; 1159 } 1160 ); 1161 1162 NAKCIDNS(CI_MS_DNS2, req_dns2, 1163 if (treat_as_reject) { 1164 try.req_dns2 = 0; 1165 } else { 1166 try.dnsaddr[1] = cidnsaddr; 1167 } 1168 ); 1169 1170 /* 1171 * There may be remaining CIs, if the peer is requesting negotiation 1172 * on an option that we didn't include in our request packet. 1173 * If they want to negotiate about IP addresses, we comply. 1174 * If they want us to ask for compression, we refuse. 1175 * If they want us to ask for ms-dns, we do that, since some 1176 * peers get huffy if we don't. 1177 */ 1178 while (len >= CILEN_VOID) { 1179 GETCHAR(citype, p); 1180 GETCHAR(cilen, p); 1181 if ( cilen < CILEN_VOID || (len -= cilen) < 0 ) 1182 goto bad; 1183 next = p + cilen - 2; 1184 1185 switch (citype) { 1186 case CI_COMPRESSTYPE: 1187 if (go->neg_vj || no.neg_vj || 1188 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) 1189 goto bad; 1190 no.neg_vj = 1; 1191 break; 1192 case CI_ADDRS: 1193 if ((!go->neg_addr && go->old_addrs) || no.old_addrs 1194 || cilen != CILEN_ADDRS) 1195 goto bad; 1196 try.neg_addr = 0; 1197 GETLONG(l, p); 1198 ciaddr1 = htonl(l); 1199 if (ciaddr1 && go->accept_local) 1200 try.ouraddr = ciaddr1; 1201 GETLONG(l, p); 1202 ciaddr2 = htonl(l); 1203 if (ciaddr2 && go->accept_remote) 1204 try.hisaddr = ciaddr2; 1205 no.old_addrs = 1; 1206 break; 1207 case CI_ADDR: 1208 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) 1209 goto bad; 1210 try.old_addrs = 0; 1211 GETLONG(l, p); 1212 ciaddr1 = htonl(l); 1213 if (ciaddr1 && go->accept_local) 1214 try.ouraddr = ciaddr1; 1215 if (try.ouraddr != 0) 1216 try.neg_addr = 1; 1217 no.neg_addr = 1; 1218 break; 1219 case CI_MS_DNS1: 1220 if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR) 1221 goto bad; 1222 GETLONG(l, p); 1223 try.dnsaddr[0] = htonl(l); 1224 try.req_dns1 = 1; 1225 no.req_dns1 = 1; 1226 break; 1227 case CI_MS_DNS2: 1228 if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR) 1229 goto bad; 1230 GETLONG(l, p); 1231 try.dnsaddr[1] = htonl(l); 1232 try.req_dns2 = 1; 1233 no.req_dns2 = 1; 1234 break; 1235 case CI_MS_WINS1: 1236 case CI_MS_WINS2: 1237 if (cilen != CILEN_ADDR) 1238 goto bad; 1239 GETLONG(l, p); 1240 ciaddr1 = htonl(l); 1241 if (ciaddr1) 1242 try.winsaddr[citype == CI_MS_WINS2] = ciaddr1; 1243 break; 1244 } 1245 p = next; 1246 } 1247 1248 /* 1249 * OK, the Nak is good. Now we can update state. 1250 * If there are any remaining options, we ignore them. 1251 */ 1252 if (f->state != OPENED) 1253 *go = try; 1254 1255 return 1; 1256 1257 bad: 1258 IPCPDEBUG(("ipcp_nakci: received bad Nak!")); 1259 return 0; 1260 } 1261 1262 1263 /* 1264 * ipcp_rejci - Reject some of our CIs. 1265 * Callback from fsm_rconfnakrej. 1266 */ 1267 static int 1268 ipcp_rejci(f, p, len) 1269 fsm *f; 1270 u_char *p; 1271 int len; 1272 { 1273 ipcp_options *go = &ipcp_gotoptions[f->unit]; 1274 u_char cimaxslotindex, ciflag, cilen; 1275 u_short cishort; 1276 u_int32_t cilong; 1277 ipcp_options try; /* options to request next time */ 1278 1279 try = *go; 1280 /* 1281 * Any Rejected CIs must be in exactly the same order that we sent. 1282 * Check packet length and CI length at each step. 1283 * If we find any deviations, then this packet is bad. 1284 */ 1285 #define REJCIADDRS(opt, neg, val1, val2) \ 1286 if ((neg) && \ 1287 (cilen = p[1]) == CILEN_ADDRS && \ 1288 len >= cilen && \ 1289 p[0] == opt) { \ 1290 u_int32_t l; \ 1291 len -= cilen; \ 1292 INCPTR(2, p); \ 1293 GETLONG(l, p); \ 1294 cilong = htonl(l); \ 1295 /* Check rejected value. */ \ 1296 if (cilong != val1) \ 1297 goto bad; \ 1298 GETLONG(l, p); \ 1299 cilong = htonl(l); \ 1300 /* Check rejected value. */ \ 1301 if (cilong != val2) \ 1302 goto bad; \ 1303 try.old_addrs = 0; \ 1304 } 1305 1306 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ 1307 if (go->neg && \ 1308 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ 1309 len >= p[1] && \ 1310 p[0] == opt) { \ 1311 len -= p[1]; \ 1312 INCPTR(2, p); \ 1313 GETSHORT(cishort, p); \ 1314 /* Check rejected value. */ \ 1315 if (cishort != val) \ 1316 goto bad; \ 1317 if (!old) { \ 1318 GETCHAR(cimaxslotindex, p); \ 1319 if (cimaxslotindex != maxslot) \ 1320 goto bad; \ 1321 GETCHAR(ciflag, p); \ 1322 if (ciflag != cflag) \ 1323 goto bad; \ 1324 } \ 1325 try.neg = 0; \ 1326 } 1327 1328 #define REJCIADDR(opt, neg, val) \ 1329 if (go->neg && \ 1330 (cilen = p[1]) == CILEN_ADDR && \ 1331 len >= cilen && \ 1332 p[0] == opt) { \ 1333 u_int32_t l; \ 1334 len -= cilen; \ 1335 INCPTR(2, p); \ 1336 GETLONG(l, p); \ 1337 cilong = htonl(l); \ 1338 /* Check rejected value. */ \ 1339 if (cilong != val) \ 1340 goto bad; \ 1341 try.neg = 0; \ 1342 } 1343 1344 #define REJCIDNS(opt, neg, dnsaddr) \ 1345 if (go->neg && \ 1346 ((cilen = p[1]) == CILEN_ADDR) && \ 1347 len >= cilen && \ 1348 p[0] == opt) { \ 1349 u_int32_t l; \ 1350 len -= cilen; \ 1351 INCPTR(2, p); \ 1352 GETLONG(l, p); \ 1353 cilong = htonl(l); \ 1354 /* Check rejected value. */ \ 1355 if (cilong != dnsaddr) \ 1356 goto bad; \ 1357 try.neg = 0; \ 1358 } 1359 1360 #define REJCIWINS(opt, addr) \ 1361 if (addr && \ 1362 ((cilen = p[1]) == CILEN_ADDR) && \ 1363 len >= cilen && \ 1364 p[0] == opt) { \ 1365 u_int32_t l; \ 1366 len -= cilen; \ 1367 INCPTR(2, p); \ 1368 GETLONG(l, p); \ 1369 cilong = htonl(l); \ 1370 /* Check rejected value. */ \ 1371 if (cilong != addr) \ 1372 goto bad; \ 1373 try.winsaddr[opt == CI_MS_WINS2] = 0; \ 1374 } 1375 1376 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, 1377 go->ouraddr, go->hisaddr); 1378 1379 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, 1380 go->maxslotindex, go->cflag); 1381 1382 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr); 1383 1384 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]); 1385 1386 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]); 1387 1388 REJCIWINS(CI_MS_WINS1, go->winsaddr[0]); 1389 1390 REJCIWINS(CI_MS_WINS2, go->winsaddr[1]); 1391 1392 /* 1393 * If there are any remaining CIs, then this packet is bad. 1394 */ 1395 if (len != 0) 1396 goto bad; 1397 /* 1398 * Now we can update state. 1399 */ 1400 if (f->state != OPENED) 1401 *go = try; 1402 return 1; 1403 1404 bad: 1405 IPCPDEBUG(("ipcp_rejci: received bad Reject!")); 1406 return 0; 1407 } 1408 1409 1410 /* 1411 * ipcp_reqci - Check the peer's requested CIs and send appropriate response. 1412 * Callback from fsm_rconfreq, Receive Configure Request 1413 * 1414 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified 1415 * appropriately. If reject_if_disagree is non-zero, doesn't return 1416 * CONFNAK; returns CONFREJ if it can't return CONFACK. 1417 */ 1418 static int 1419 ipcp_reqci(f, inp, len, reject_if_disagree) 1420 fsm *f; 1421 u_char *inp; /* Requested CIs */ 1422 int *len; /* Length of requested CIs */ 1423 int reject_if_disagree; 1424 { 1425 ipcp_options *wo = &ipcp_wantoptions[f->unit]; 1426 ipcp_options *ho = &ipcp_hisoptions[f->unit]; 1427 ipcp_options *ao = &ipcp_allowoptions[f->unit]; 1428 u_char *cip, *next; /* Pointer to current and next CIs */ 1429 u_short cilen, citype; /* Parsed len, type */ 1430 u_short cishort; /* Parsed short value */ 1431 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */ 1432 int rc = CONFACK; /* Final packet return code */ 1433 int orc; /* Individual option return code */ 1434 u_char *p; /* Pointer to next char to parse */ 1435 u_char *ucp = inp; /* Pointer to current output char */ 1436 int l = *len; /* Length left */ 1437 u_char maxslotindex, cflag; 1438 int d; 1439 1440 /* 1441 * Reset all his options. 1442 */ 1443 BZERO(ho, sizeof(*ho)); 1444 1445 /* 1446 * Process all his options. 1447 */ 1448 next = inp; 1449 while (l) { 1450 orc = CONFACK; /* Assume success */ 1451 cip = p = next; /* Remember begining of CI */ 1452 if (l < 2 || /* Not enough data for CI header or */ 1453 p[1] < 2 || /* CI length too small or */ 1454 p[1] > l) { /* CI length too big? */ 1455 IPCPDEBUG(("ipcp_reqci: bad CI length!")); 1456 orc = CONFREJ; /* Reject bad CI */ 1457 cilen = l; /* Reject till end of packet */ 1458 l = 0; /* Don't loop again */ 1459 goto endswitch; 1460 } 1461 GETCHAR(citype, p); /* Parse CI type */ 1462 GETCHAR(cilen, p); /* Parse CI length */ 1463 l -= cilen; /* Adjust remaining length */ 1464 next += cilen; /* Step to next CI */ 1465 1466 switch (citype) { /* Check CI type */ 1467 case CI_ADDRS: 1468 if (!ao->old_addrs || ho->neg_addr || 1469 cilen != CILEN_ADDRS) { /* Check CI length */ 1470 orc = CONFREJ; /* Reject CI */ 1471 break; 1472 } 1473 1474 /* 1475 * If he has no address, or if we both have his address but 1476 * disagree about it, then NAK it with our idea. 1477 * In particular, if we don't know his address, but he does, 1478 * then accept it. 1479 */ 1480 GETLONG(tl, p); /* Parse source address (his) */ 1481 ciaddr1 = htonl(tl); 1482 if (ciaddr1 != wo->hisaddr 1483 && (ciaddr1 == 0 || !wo->accept_remote)) { 1484 orc = CONFNAK; 1485 if (!reject_if_disagree) { 1486 DECPTR(sizeof(u_int32_t), p); 1487 tl = ntohl(wo->hisaddr); 1488 PUTLONG(tl, p); 1489 } 1490 } else if (ciaddr1 == 0 && wo->hisaddr == 0) { 1491 /* 1492 * If neither we nor he knows his address, reject the option. 1493 */ 1494 orc = CONFREJ; 1495 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ 1496 break; 1497 } 1498 1499 /* 1500 * If he doesn't know our address, or if we both have our address 1501 * but disagree about it, then NAK it with our idea. 1502 */ 1503 GETLONG(tl, p); /* Parse desination address (ours) */ 1504 ciaddr2 = htonl(tl); 1505 if (ciaddr2 != wo->ouraddr) { 1506 if (ciaddr2 == 0 || !wo->accept_local) { 1507 orc = CONFNAK; 1508 if (!reject_if_disagree) { 1509 DECPTR(sizeof(u_int32_t), p); 1510 tl = ntohl(wo->ouraddr); 1511 PUTLONG(tl, p); 1512 } 1513 } else { 1514 wo->ouraddr = ciaddr2; /* accept peer's idea */ 1515 } 1516 } 1517 1518 ho->old_addrs = 1; 1519 ho->hisaddr = ciaddr1; 1520 ho->ouraddr = ciaddr2; 1521 break; 1522 1523 case CI_ADDR: 1524 if (!ao->neg_addr || ho->old_addrs || 1525 cilen != CILEN_ADDR) { /* Check CI length */ 1526 orc = CONFREJ; /* Reject CI */ 1527 break; 1528 } 1529 1530 /* 1531 * If he has no address, or if we both have his address but 1532 * disagree about it, then NAK it with our idea. 1533 * In particular, if we don't know his address, but he does, 1534 * then accept it. 1535 */ 1536 GETLONG(tl, p); /* Parse source address (his) */ 1537 ciaddr1 = htonl(tl); 1538 if (ciaddr1 != wo->hisaddr 1539 && (ciaddr1 == 0 || !wo->accept_remote)) { 1540 orc = CONFNAK; 1541 if (!reject_if_disagree) { 1542 DECPTR(sizeof(u_int32_t), p); 1543 tl = ntohl(wo->hisaddr); 1544 PUTLONG(tl, p); 1545 } 1546 } else if (ciaddr1 == 0 && wo->hisaddr == 0) { 1547 /* 1548 * Don't ACK an address of 0.0.0.0 - reject it instead. 1549 */ 1550 orc = CONFREJ; 1551 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ 1552 break; 1553 } 1554 1555 ho->neg_addr = 1; 1556 ho->hisaddr = ciaddr1; 1557 break; 1558 1559 case CI_MS_DNS1: 1560 case CI_MS_DNS2: 1561 /* Microsoft primary or secondary DNS request */ 1562 d = citype == CI_MS_DNS2; 1563 1564 /* If we do not have a DNS address then we cannot send it */ 1565 if (ao->dnsaddr[d] == 0 || 1566 cilen != CILEN_ADDR) { /* Check CI length */ 1567 orc = CONFREJ; /* Reject CI */ 1568 break; 1569 } 1570 GETLONG(tl, p); 1571 if (htonl(tl) != ao->dnsaddr[d]) { 1572 DECPTR(sizeof(u_int32_t), p); 1573 tl = ntohl(ao->dnsaddr[d]); 1574 PUTLONG(tl, p); 1575 orc = CONFNAK; 1576 } 1577 break; 1578 1579 case CI_MS_WINS1: 1580 case CI_MS_WINS2: 1581 /* Microsoft primary or secondary WINS request */ 1582 d = citype == CI_MS_WINS2; 1583 1584 /* If we do not have a DNS address then we cannot send it */ 1585 if (ao->winsaddr[d] == 0 || 1586 cilen != CILEN_ADDR) { /* Check CI length */ 1587 orc = CONFREJ; /* Reject CI */ 1588 break; 1589 } 1590 GETLONG(tl, p); 1591 if (htonl(tl) != ao->winsaddr[d]) { 1592 DECPTR(sizeof(u_int32_t), p); 1593 tl = ntohl(ao->winsaddr[d]); 1594 PUTLONG(tl, p); 1595 orc = CONFNAK; 1596 } 1597 break; 1598 1599 case CI_COMPRESSTYPE: 1600 if (!ao->neg_vj || 1601 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) { 1602 orc = CONFREJ; 1603 break; 1604 } 1605 GETSHORT(cishort, p); 1606 1607 if (!(cishort == IPCP_VJ_COMP || 1608 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { 1609 orc = CONFREJ; 1610 break; 1611 } 1612 1613 ho->neg_vj = 1; 1614 ho->vj_protocol = cishort; 1615 if (cilen == CILEN_VJ) { 1616 GETCHAR(maxslotindex, p); 1617 if (maxslotindex > ao->maxslotindex) { 1618 orc = CONFNAK; 1619 if (!reject_if_disagree){ 1620 DECPTR(1, p); 1621 PUTCHAR(ao->maxslotindex, p); 1622 } 1623 } 1624 GETCHAR(cflag, p); 1625 if (cflag && !ao->cflag) { 1626 orc = CONFNAK; 1627 if (!reject_if_disagree){ 1628 DECPTR(1, p); 1629 PUTCHAR(wo->cflag, p); 1630 } 1631 } 1632 ho->maxslotindex = maxslotindex; 1633 ho->cflag = cflag; 1634 } else { 1635 ho->old_vj = 1; 1636 ho->maxslotindex = MAX_STATES - 1; 1637 ho->cflag = 1; 1638 } 1639 break; 1640 1641 default: 1642 orc = CONFREJ; 1643 break; 1644 } 1645 endswitch: 1646 if (orc == CONFACK && /* Good CI */ 1647 rc != CONFACK) /* but prior CI wasnt? */ 1648 continue; /* Don't send this one */ 1649 1650 if (orc == CONFNAK) { /* Nak this CI? */ 1651 if (reject_if_disagree) /* Getting fed up with sending NAKs? */ 1652 orc = CONFREJ; /* Get tough if so */ 1653 else { 1654 if (rc == CONFREJ) /* Rejecting prior CI? */ 1655 continue; /* Don't send this one */ 1656 if (rc == CONFACK) { /* Ack'd all prior CIs? */ 1657 rc = CONFNAK; /* Not anymore... */ 1658 ucp = inp; /* Backup */ 1659 } 1660 } 1661 } 1662 1663 if (orc == CONFREJ && /* Reject this CI */ 1664 rc != CONFREJ) { /* but no prior ones? */ 1665 rc = CONFREJ; 1666 ucp = inp; /* Backup */ 1667 } 1668 1669 /* Need to move CI? */ 1670 if (ucp != cip) 1671 BCOPY(cip, ucp, cilen); /* Move it */ 1672 1673 /* Update output pointer */ 1674 INCPTR(cilen, ucp); 1675 } 1676 1677 /* 1678 * If we aren't rejecting this packet, and we want to negotiate 1679 * their address, and they didn't send their address, then we 1680 * send a NAK with a CI_ADDR option appended. We assume the 1681 * input buffer is long enough that we can append the extra 1682 * option safely. 1683 */ 1684 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs && 1685 wo->req_addr && !reject_if_disagree && !noremoteip) { 1686 if (rc == CONFACK) { 1687 rc = CONFNAK; 1688 ucp = inp; /* reset pointer */ 1689 wo->req_addr = 0; /* don't ask again */ 1690 } 1691 PUTCHAR(CI_ADDR, ucp); 1692 PUTCHAR(CILEN_ADDR, ucp); 1693 tl = ntohl(wo->hisaddr); 1694 PUTLONG(tl, ucp); 1695 } 1696 1697 *len = ucp - inp; /* Compute output length */ 1698 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc))); 1699 return (rc); /* Return final code */ 1700 } 1701 1702 1703 /* 1704 * ip_check_options - check that any IP-related options are OK, 1705 * and assign appropriate defaults. 1706 */ 1707 static void 1708 ip_check_options() 1709 { 1710 struct hostent *hp; 1711 u_int32_t local; 1712 ipcp_options *wo = &ipcp_wantoptions[0]; 1713 1714 /* 1715 * Default our local IP address based on our hostname. 1716 * If local IP address already given, don't bother. 1717 */ 1718 if (wo->ouraddr == 0 && !disable_defaultip) { 1719 /* 1720 * Look up our hostname (possibly with domain name appended) 1721 * and take the first IP address as our local IP address. 1722 * If there isn't an IP address for our hostname, too bad. 1723 */ 1724 wo->accept_local = 1; /* don't insist on this default value */ 1725 if ((hp = gethostbyname(hostname)) != NULL) { 1726 local = *(u_int32_t *)hp->h_addr; 1727 if (local != 0 && !bad_ip_adrs(local)) 1728 wo->ouraddr = local; 1729 } 1730 } 1731 ask_for_local = wo->ouraddr != 0 || !disable_defaultip; 1732 } 1733 1734 1735 /* 1736 * ip_demand_conf - configure the interface as though 1737 * IPCP were up, for use with dial-on-demand. 1738 */ 1739 static int 1740 ip_demand_conf(u) 1741 int u; 1742 { 1743 ipcp_options *wo = &ipcp_wantoptions[u]; 1744 1745 if (wo->hisaddr == 0 && !noremoteip) { 1746 /* make up an arbitrary address for the peer */ 1747 wo->hisaddr = htonl(0x0a707070 + ifunit); 1748 wo->accept_remote = 1; 1749 } 1750 if (wo->ouraddr == 0) { 1751 /* make up an arbitrary address for us */ 1752 wo->ouraddr = htonl(0x0a404040 + ifunit); 1753 wo->accept_local = 1; 1754 ask_for_local = 0; /* don't tell the peer this address */ 1755 } 1756 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) 1757 return 0; 1758 ipcp_script(_PATH_IPPREUP, 1); 1759 if (!sifup(u)) 1760 return 0; 1761 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) 1762 return 0; 1763 if (wo->default_route) 1764 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) 1765 default_route_set[u] = 1; 1766 if (wo->proxy_arp) 1767 if (sifproxyarp(u, wo->hisaddr)) 1768 proxy_arp_set[u] = 1; 1769 1770 notice("local IP address %I", wo->ouraddr); 1771 if (wo->hisaddr) 1772 notice("remote IP address %I", wo->hisaddr); 1773 1774 return 1; 1775 } 1776 1777 1778 /* 1779 * ipcp_up - IPCP has come UP. 1780 * 1781 * Configure the IP network interface appropriately and bring it up. 1782 */ 1783 static void 1784 ipcp_up(f) 1785 fsm *f; 1786 { 1787 u_int32_t mask; 1788 ipcp_options *ho = &ipcp_hisoptions[f->unit]; 1789 ipcp_options *go = &ipcp_gotoptions[f->unit]; 1790 ipcp_options *wo = &ipcp_wantoptions[f->unit]; 1791 1792 IPCPDEBUG(("ipcp: up")); 1793 1794 /* 1795 * We must have a non-zero IP address for both ends of the link. 1796 */ 1797 if (!ho->neg_addr && !ho->old_addrs) 1798 ho->hisaddr = wo->hisaddr; 1799 1800 if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs) 1801 && wo->ouraddr != 0) { 1802 error("Peer refused to agree to our IP address"); 1803 ipcp_close(f->unit, "Refused our IP address"); 1804 return; 1805 } 1806 if (go->ouraddr == 0) { 1807 error("Could not determine local IP address"); 1808 ipcp_close(f->unit, "Could not determine local IP address"); 1809 return; 1810 } 1811 if (ho->hisaddr == 0 && !noremoteip) { 1812 ho->hisaddr = htonl(0x0a404040 + ifunit); 1813 warn("Could not determine remote IP address: defaulting to %I", 1814 ho->hisaddr); 1815 } 1816 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0); 1817 if (ho->hisaddr != 0) 1818 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1); 1819 1820 if (!go->req_dns1) 1821 go->dnsaddr[0] = 0; 1822 if (!go->req_dns2) 1823 go->dnsaddr[1] = 0; 1824 if (go->dnsaddr[0]) 1825 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0); 1826 if (go->dnsaddr[1]) 1827 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0); 1828 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) { 1829 script_setenv("USEPEERDNS", "1", 0); 1830 create_resolv(go->dnsaddr[0], go->dnsaddr[1]); 1831 } 1832 1833 /* 1834 * Check that the peer is allowed to use the IP address it wants. 1835 */ 1836 if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) { 1837 error("Peer is not authorized to use remote address %I", ho->hisaddr); 1838 ipcp_close(f->unit, "Unauthorized remote IP address"); 1839 return; 1840 } 1841 1842 /* set tcp compression */ 1843 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); 1844 1845 /* 1846 * If we are doing dial-on-demand, the interface is already 1847 * configured, so we put out any saved-up packets, then set the 1848 * interface to pass IP packets. 1849 */ 1850 if (demand) { 1851 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { 1852 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr); 1853 if (go->ouraddr != wo->ouraddr) { 1854 warn("Local IP address changed to %I", go->ouraddr); 1855 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0); 1856 wo->ouraddr = go->ouraddr; 1857 } else 1858 script_unsetenv("OLDIPLOCAL"); 1859 if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) { 1860 warn("Remote IP address changed to %I", ho->hisaddr); 1861 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0); 1862 wo->hisaddr = ho->hisaddr; 1863 } else 1864 script_unsetenv("OLDIPREMOTE"); 1865 1866 /* Set the interface to the new addresses */ 1867 mask = GetMask(go->ouraddr); 1868 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { 1869 if (debug) 1870 warn("Interface configuration failed"); 1871 ipcp_close(f->unit, "Interface configuration failed"); 1872 return; 1873 } 1874 1875 /* assign a default route through the interface if required */ 1876 if (ipcp_wantoptions[f->unit].default_route) 1877 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) 1878 default_route_set[f->unit] = 1; 1879 1880 /* Make a proxy ARP entry if requested. */ 1881 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp) 1882 if (sifproxyarp(f->unit, ho->hisaddr)) 1883 proxy_arp_set[f->unit] = 1; 1884 1885 } 1886 demand_rexmit(PPP_IP); 1887 sifnpmode(f->unit, PPP_IP, NPMODE_PASS); 1888 1889 } else { 1890 /* 1891 * Set IP addresses and (if specified) netmask. 1892 */ 1893 mask = GetMask(go->ouraddr); 1894 1895 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1896 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { 1897 if (debug) 1898 warn("Interface configuration failed"); 1899 ipcp_close(f->unit, "Interface configuration failed"); 1900 return; 1901 } 1902 #endif 1903 1904 /* run the pre-up script, if any, and wait for it to finish */ 1905 ipcp_script(_PATH_IPPREUP, 1); 1906 1907 /* bring the interface up for IP */ 1908 if (!sifup(f->unit)) { 1909 if (debug) 1910 warn("Interface failed to come up"); 1911 ipcp_close(f->unit, "Interface configuration failed"); 1912 return; 1913 } 1914 1915 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) 1916 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { 1917 if (debug) 1918 warn("Interface configuration failed"); 1919 ipcp_close(f->unit, "Interface configuration failed"); 1920 return; 1921 } 1922 #endif 1923 sifnpmode(f->unit, PPP_IP, NPMODE_PASS); 1924 1925 /* assign a default route through the interface if required */ 1926 if (ipcp_wantoptions[f->unit].default_route) 1927 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) 1928 default_route_set[f->unit] = 1; 1929 1930 /* Make a proxy ARP entry if requested. */ 1931 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp) 1932 if (sifproxyarp(f->unit, ho->hisaddr)) 1933 proxy_arp_set[f->unit] = 1; 1934 1935 ipcp_wantoptions[0].ouraddr = go->ouraddr; 1936 1937 notice("local IP address %I", go->ouraddr); 1938 if (ho->hisaddr != 0) 1939 notice("remote IP address %I", ho->hisaddr); 1940 if (go->dnsaddr[0]) 1941 notice("primary DNS address %I", go->dnsaddr[0]); 1942 if (go->dnsaddr[1]) 1943 notice("secondary DNS address %I", go->dnsaddr[1]); 1944 } 1945 1946 reset_link_stats(f->unit); 1947 1948 np_up(f->unit, PPP_IP); 1949 ipcp_is_up = 1; 1950 1951 notify(ip_up_notifier, 0); 1952 if (ip_up_hook) 1953 ip_up_hook(); 1954 1955 /* 1956 * Execute the ip-up script, like this: 1957 * /etc/ppp/ip-up interface tty speed local-IP remote-IP 1958 */ 1959 if (ipcp_script_state == s_down && ipcp_script_pid == 0) { 1960 ipcp_script_state = s_up; 1961 ipcp_script(_PATH_IPUP, 0); 1962 } 1963 } 1964 1965 1966 /* 1967 * ipcp_down - IPCP has gone DOWN. 1968 * 1969 * Take the IP network interface down, clear its addresses 1970 * and delete routes through it. 1971 */ 1972 static void 1973 ipcp_down(f) 1974 fsm *f; 1975 { 1976 IPCPDEBUG(("ipcp: down")); 1977 /* XXX a bit IPv4-centric here, we only need to get the stats 1978 * before the interface is marked down. */ 1979 /* XXX more correct: we must get the stats before running the notifiers, 1980 * at least for the radius plugin */ 1981 update_link_stats(f->unit); 1982 notify(ip_down_notifier, 0); 1983 if (ip_down_hook) 1984 ip_down_hook(); 1985 if (ipcp_is_up) { 1986 ipcp_is_up = 0; 1987 np_down(f->unit, PPP_IP); 1988 } 1989 sifvjcomp(f->unit, 0, 0, 0); 1990 1991 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(), 1992 * because print_link_stats() sets link_stats_valid 1993 * to 0 (zero) */ 1994 1995 /* 1996 * If we are doing dial-on-demand, set the interface 1997 * to queue up outgoing packets (for now). 1998 */ 1999 if (demand) { 2000 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE); 2001 } else { 2002 sifnpmode(f->unit, PPP_IP, NPMODE_DROP); 2003 sifdown(f->unit); 2004 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr, 2005 ipcp_hisoptions[f->unit].hisaddr); 2006 } 2007 2008 /* Execute the ip-down script */ 2009 if (ipcp_script_state == s_up && ipcp_script_pid == 0) { 2010 ipcp_script_state = s_down; 2011 ipcp_script(_PATH_IPDOWN, 0); 2012 } 2013 } 2014 2015 2016 /* 2017 * ipcp_clear_addrs() - clear the interface addresses, routes, 2018 * proxy arp entries, etc. 2019 */ 2020 static void 2021 ipcp_clear_addrs(unit, ouraddr, hisaddr) 2022 int unit; 2023 u_int32_t ouraddr; /* local address */ 2024 u_int32_t hisaddr; /* remote address */ 2025 { 2026 if (proxy_arp_set[unit]) { 2027 cifproxyarp(unit, hisaddr); 2028 proxy_arp_set[unit] = 0; 2029 } 2030 if (default_route_set[unit]) { 2031 cifdefaultroute(unit, ouraddr, hisaddr); 2032 default_route_set[unit] = 0; 2033 } 2034 cifaddr(unit, ouraddr, hisaddr); 2035 } 2036 2037 2038 /* 2039 * ipcp_finished - possibly shut down the lower layers. 2040 */ 2041 static void 2042 ipcp_finished(f) 2043 fsm *f; 2044 { 2045 if (ipcp_is_open) { 2046 ipcp_is_open = 0; 2047 np_finished(f->unit, PPP_IP); 2048 } 2049 } 2050 2051 2052 /* 2053 * ipcp_script_done - called when the ip-up or ip-down script 2054 * has finished. 2055 */ 2056 static void 2057 ipcp_script_done(arg) 2058 void *arg; 2059 { 2060 ipcp_script_pid = 0; 2061 switch (ipcp_script_state) { 2062 case s_up: 2063 if (ipcp_fsm[0].state != OPENED) { 2064 ipcp_script_state = s_down; 2065 ipcp_script(_PATH_IPDOWN, 0); 2066 } 2067 break; 2068 case s_down: 2069 if (ipcp_fsm[0].state == OPENED) { 2070 ipcp_script_state = s_up; 2071 ipcp_script(_PATH_IPUP, 0); 2072 } 2073 break; 2074 } 2075 } 2076 2077 2078 /* 2079 * ipcp_script - Execute a script with arguments 2080 * interface-name tty-name speed local-IP remote-IP. 2081 */ 2082 static void 2083 ipcp_script(script, wait) 2084 char *script; 2085 int wait; 2086 { 2087 char strspeed[32], strlocal[32], strremote[32]; 2088 char *argv[8]; 2089 2090 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate); 2091 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr); 2092 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr); 2093 2094 argv[0] = script; 2095 argv[1] = ifname; 2096 argv[2] = devnam; 2097 argv[3] = strspeed; 2098 argv[4] = strlocal; 2099 argv[5] = strremote; 2100 argv[6] = ipparam; 2101 argv[7] = NULL; 2102 if (wait) 2103 run_program(script, argv, 0, NULL, NULL, 1); 2104 else 2105 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, 2106 NULL, 0); 2107 } 2108 2109 /* 2110 * create_resolv - create the replacement resolv.conf file 2111 */ 2112 static void 2113 create_resolv(peerdns1, peerdns2) 2114 u_int32_t peerdns1, peerdns2; 2115 { 2116 #if !defined(__ANDROID__) 2117 FILE *f; 2118 2119 f = fopen(_PATH_RESOLV, "w"); 2120 if (f == NULL) { 2121 error("Failed to create %s: %m", _PATH_RESOLV); 2122 return; 2123 } 2124 2125 if (peerdns1) 2126 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1)); 2127 2128 if (peerdns2) 2129 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2)); 2130 2131 if (ferror(f)) 2132 error("Write failed to %s: %m", _PATH_RESOLV); 2133 2134 fclose(f); 2135 #endif 2136 } 2137 2138 /* 2139 * ipcp_printpkt - print the contents of an IPCP packet. 2140 */ 2141 static char *ipcp_codenames[] = { 2142 "ConfReq", "ConfAck", "ConfNak", "ConfRej", 2143 "TermReq", "TermAck", "CodeRej" 2144 }; 2145 2146 static int 2147 ipcp_printpkt(p, plen, printer, arg) 2148 u_char *p; 2149 int plen; 2150 void (*printer) __P((void *, char *, ...)); 2151 void *arg; 2152 { 2153 int code, id, len, olen; 2154 u_char *pstart, *optend; 2155 u_short cishort; 2156 u_int32_t cilong; 2157 2158 if (plen < HEADERLEN) 2159 return 0; 2160 pstart = p; 2161 GETCHAR(code, p); 2162 GETCHAR(id, p); 2163 GETSHORT(len, p); 2164 if (len < HEADERLEN || len > plen) 2165 return 0; 2166 2167 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *)) 2168 printer(arg, " %s", ipcp_codenames[code-1]); 2169 else 2170 printer(arg, " code=0x%x", code); 2171 printer(arg, " id=0x%x", id); 2172 len -= HEADERLEN; 2173 switch (code) { 2174 case CONFREQ: 2175 case CONFACK: 2176 case CONFNAK: 2177 case CONFREJ: 2178 /* print option list */ 2179 while (len >= 2) { 2180 GETCHAR(code, p); 2181 GETCHAR(olen, p); 2182 p -= 2; 2183 if (olen < 2 || olen > len) { 2184 break; 2185 } 2186 printer(arg, " <"); 2187 len -= olen; 2188 optend = p + olen; 2189 switch (code) { 2190 case CI_ADDRS: 2191 if (olen == CILEN_ADDRS) { 2192 p += 2; 2193 GETLONG(cilong, p); 2194 printer(arg, "addrs %I", htonl(cilong)); 2195 GETLONG(cilong, p); 2196 printer(arg, " %I", htonl(cilong)); 2197 } 2198 break; 2199 case CI_COMPRESSTYPE: 2200 if (olen >= CILEN_COMPRESS) { 2201 p += 2; 2202 GETSHORT(cishort, p); 2203 printer(arg, "compress "); 2204 switch (cishort) { 2205 case IPCP_VJ_COMP: 2206 printer(arg, "VJ"); 2207 break; 2208 case IPCP_VJ_COMP_OLD: 2209 printer(arg, "old-VJ"); 2210 break; 2211 default: 2212 printer(arg, "0x%x", cishort); 2213 } 2214 } 2215 break; 2216 case CI_ADDR: 2217 if (olen == CILEN_ADDR) { 2218 p += 2; 2219 GETLONG(cilong, p); 2220 printer(arg, "addr %I", htonl(cilong)); 2221 } 2222 break; 2223 case CI_MS_DNS1: 2224 case CI_MS_DNS2: 2225 p += 2; 2226 GETLONG(cilong, p); 2227 printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2), 2228 htonl(cilong)); 2229 break; 2230 case CI_MS_WINS1: 2231 case CI_MS_WINS2: 2232 p += 2; 2233 GETLONG(cilong, p); 2234 printer(arg, "ms-wins %I", htonl(cilong)); 2235 break; 2236 } 2237 while (p < optend) { 2238 GETCHAR(code, p); 2239 printer(arg, " %.2x", code); 2240 } 2241 printer(arg, ">"); 2242 } 2243 break; 2244 2245 case TERMACK: 2246 case TERMREQ: 2247 if (len > 0 && *p >= ' ' && *p < 0x7f) { 2248 printer(arg, " "); 2249 print_string((char *)p, len, printer, arg); 2250 p += len; 2251 len = 0; 2252 } 2253 break; 2254 } 2255 2256 /* print the rest of the bytes in the packet */ 2257 for (; len > 0; --len) { 2258 GETCHAR(code, p); 2259 printer(arg, " %.2x", code); 2260 } 2261 2262 return p - pstart; 2263 } 2264 2265 /* 2266 * ip_active_pkt - see if this IP packet is worth bringing the link up for. 2267 * We don't bring the link up for IP fragments or for TCP FIN packets 2268 * with no data. 2269 */ 2270 #define IP_HDRLEN 20 /* bytes */ 2271 #define IP_OFFMASK 0x1fff 2272 #ifndef IPPROTO_TCP 2273 #define IPPROTO_TCP 6 2274 #endif 2275 #define TCP_HDRLEN 20 2276 #define TH_FIN 0x01 2277 2278 /* 2279 * We use these macros because the IP header may be at an odd address, 2280 * and some compilers might use word loads to get th_off or ip_hl. 2281 */ 2282 2283 #define net_short(x) (((x)[0] << 8) + (x)[1]) 2284 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) 2285 #define get_ipoff(x) net_short((unsigned char *)(x) + 6) 2286 #define get_ipproto(x) (((unsigned char *)(x))[9]) 2287 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) 2288 #define get_tcpflags(x) (((unsigned char *)(x))[13]) 2289 2290 static int 2291 ip_active_pkt(pkt, len) 2292 u_char *pkt; 2293 int len; 2294 { 2295 u_char *tcp; 2296 int hlen; 2297 2298 len -= PPP_HDRLEN; 2299 pkt += PPP_HDRLEN; 2300 if (len < IP_HDRLEN) 2301 return 0; 2302 if ((get_ipoff(pkt) & IP_OFFMASK) != 0) 2303 return 0; 2304 if (get_ipproto(pkt) != IPPROTO_TCP) 2305 return 1; 2306 hlen = get_iphl(pkt) * 4; 2307 if (len < hlen + TCP_HDRLEN) 2308 return 0; 2309 tcp = pkt + hlen; 2310 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) 2311 return 0; 2312 return 1; 2313 } 2314
