1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/ipcp.c,v 1.90.2.12 2002/09/28 10:16:25 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/ipcp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/in.h> 35 #include <netinet/ip.h> 36 #include <arpa/inet.h> 37 #include <sys/socket.h> 38 #include <net/if.h> 39 #include <net/route.h> 40 #include <netdb.h> 41 #include <sys/un.h> 42 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <resolv.h> 46 #include <stdarg.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <sys/stat.h> 50 #include <termios.h> 51 #include <unistd.h> 52 53 #ifndef NONAT 54 #ifdef LOCALNAT 55 #include "alias.h" 56 #else 57 #include <alias.h> 58 #endif 59 #endif 60 61 #include "layer.h" 62 #include "ua.h" 63 #include "defs.h" 64 #include "command.h" 65 #include "mbuf.h" 66 #include "log.h" 67 #include "timer.h" 68 #include "fsm.h" 69 #include "proto.h" 70 #include "iplist.h" 71 #include "throughput.h" 72 #include "slcompress.h" 73 #include "lqr.h" 74 #include "hdlc.h" 75 #include "lcp.h" 76 #include "ncpaddr.h" 77 #include "ip.h" 78 #include "ipcp.h" 79 #include "filter.h" 80 #include "descriptor.h" 81 #include "vjcomp.h" 82 #include "async.h" 83 #include "ccp.h" 84 #include "link.h" 85 #include "physical.h" 86 #include "mp.h" 87 #ifndef NORADIUS 88 #include "radius.h" 89 #endif 90 #include "ipv6cp.h" 91 #include "ncp.h" 92 #include "bundle.h" 93 #include "id.h" 94 #include "arp.h" 95 #include "systems.h" 96 #include "prompt.h" 97 #include "route.h" 98 #include "iface.h" 99 100 #undef REJECTED 101 #define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) 102 #define issep(ch) ((ch) == ' ' || (ch) == '\t') 103 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') 104 105 struct compreq { 106 u_short proto; 107 u_char slots; 108 u_char compcid; 109 }; 110 111 static int IpcpLayerUp(struct fsm *); 112 static void IpcpLayerDown(struct fsm *); 113 static void IpcpLayerStart(struct fsm *); 114 static void IpcpLayerFinish(struct fsm *); 115 static void IpcpInitRestartCounter(struct fsm *, int); 116 static void IpcpSendConfigReq(struct fsm *); 117 static void IpcpSentTerminateReq(struct fsm *); 118 static void IpcpSendTerminateAck(struct fsm *, u_char); 119 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 120 struct fsm_decode *); 121 122 static struct fsm_callbacks ipcp_Callbacks = { 123 IpcpLayerUp, 124 IpcpLayerDown, 125 IpcpLayerStart, 126 IpcpLayerFinish, 127 IpcpInitRestartCounter, 128 IpcpSendConfigReq, 129 IpcpSentTerminateReq, 130 IpcpSendTerminateAck, 131 IpcpDecodeConfig, 132 fsm_NullRecvResetReq, 133 fsm_NullRecvResetAck 134 }; 135 136 static const char * 137 protoname(int proto) 138 { 139 static struct { 140 int id; 141 const char *txt; 142 } cftypes[] = { 143 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 144 { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */ 145 { 2, "COMPPROTO" }, /* IP-Compression-Protocol */ 146 { 3, "IPADDR" }, /* IP-Address */ 147 { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */ 148 { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */ 149 { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */ 150 { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */ 151 }; 152 unsigned f; 153 154 for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++) 155 if (cftypes[f].id == proto) 156 return cftypes[f].txt; 157 158 return NumStr(proto, NULL, 0); 159 } 160 161 void 162 ipcp_AddInOctets(struct ipcp *ipcp, int n) 163 { 164 throughput_addin(&ipcp->throughput, n); 165 } 166 167 void 168 ipcp_AddOutOctets(struct ipcp *ipcp, int n) 169 { 170 throughput_addout(&ipcp->throughput, n); 171 } 172 173 void 174 ipcp_LoadDNS(struct ipcp *ipcp) 175 { 176 int fd; 177 178 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE; 179 180 if (ipcp->ns.resolv != NULL) { 181 free(ipcp->ns.resolv); 182 ipcp->ns.resolv = NULL; 183 } 184 if (ipcp->ns.resolv_nons != NULL) { 185 free(ipcp->ns.resolv_nons); 186 ipcp->ns.resolv_nons = NULL; 187 } 188 ipcp->ns.resolver = 0; 189 190 if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) { 191 struct stat st; 192 193 if (fstat(fd, &st) == 0) { 194 ssize_t got; 195 196 if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL) 197 log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n", 198 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 199 else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) { 200 log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n", 201 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 202 free(ipcp->ns.resolv_nons); 203 ipcp->ns.resolv_nons = NULL; 204 } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) { 205 if (got == -1) 206 log_Printf(LogERROR, "Failed to read %s: %s\n", 207 _PATH_RESCONF, strerror(errno)); 208 else 209 log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n", 210 _PATH_RESCONF, (unsigned long)got, 211 (unsigned long)st.st_size); 212 free(ipcp->ns.resolv_nons); 213 ipcp->ns.resolv_nons = NULL; 214 free(ipcp->ns.resolv); 215 ipcp->ns.resolv = NULL; 216 } else { 217 char *cp, *cp_nons, *ncp, ch; 218 int n; 219 220 ipcp->ns.resolv[st.st_size] = '\0'; 221 ipcp->ns.resolver = 1; 222 223 cp_nons = ipcp->ns.resolv_nons; 224 cp = ipcp->ns.resolv; 225 n = 0; 226 227 while ((ncp = strstr(cp, "nameserver")) != NULL) { 228 if (ncp != cp) { 229 memcpy(cp_nons, cp, ncp - cp); 230 cp_nons += ncp - cp; 231 } 232 if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) { 233 memcpy(cp_nons, ncp, 9); 234 cp_nons += 9; 235 cp = ncp + 9; /* Can't match "nameserver" at cp... */ 236 continue; 237 } 238 239 for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */ 240 ; 241 242 for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */ 243 ; 244 245 ch = *ncp; 246 *ncp = '\0'; 247 if (n < 2 && inet_aton(cp, ipcp->ns.dns)) 248 n++; 249 *ncp = ch; 250 251 if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */ 252 cp = ncp + strlen(ncp); 253 else 254 cp++; 255 } 256 strcpy(cp_nons, cp); /* Copy the end - including the NUL */ 257 cp_nons += strlen(cp_nons) - 1; 258 while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n') 259 *cp_nons-- = '\0'; 260 if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) { 261 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 262 ipcp->ns.dns[1].s_addr = INADDR_ANY; 263 } 264 bundle_AdjustDNS(ipcp->fsm.bundle); 265 } 266 } else 267 log_Printf(LogERROR, "Failed to stat opened %s: %s\n", 268 _PATH_RESCONF, strerror(errno)); 269 270 close(fd); 271 } 272 } 273 274 int 275 ipcp_WriteDNS(struct ipcp *ipcp) 276 { 277 const char *paddr; 278 mode_t mask; 279 FILE *fp; 280 281 if (ipcp->ns.dns[0].s_addr == INADDR_ANY && 282 ipcp->ns.dns[1].s_addr == INADDR_ANY) { 283 log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n", 284 _PATH_RESCONF); 285 return 0; 286 } 287 288 if (ipcp->ns.dns[0].s_addr == INADDR_ANY) { 289 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 290 ipcp->ns.dns[1].s_addr = INADDR_ANY; 291 } 292 293 mask = umask(022); 294 if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) { 295 umask(mask); 296 if (ipcp->ns.resolv_nons) 297 fputs(ipcp->ns.resolv_nons, fp); 298 paddr = inet_ntoa(ipcp->ns.dns[0]); 299 log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr); 300 fprintf(fp, "\nnameserver %s\n", paddr); 301 if (ipcp->ns.dns[1].s_addr != INADDR_ANY && 302 ipcp->ns.dns[1].s_addr != INADDR_NONE && 303 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) { 304 paddr = inet_ntoa(ipcp->ns.dns[1]); 305 log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr); 306 fprintf(fp, "nameserver %s\n", paddr); 307 } 308 if (fclose(fp) == EOF) { 309 log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF, 310 strerror(errno)); 311 return 0; 312 } 313 } else 314 umask(mask); 315 316 return 1; 317 } 318 319 void 320 ipcp_RestoreDNS(struct ipcp *ipcp) 321 { 322 if (ipcp->ns.resolver) { 323 ssize_t got, len; 324 int fd; 325 326 if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) { 327 len = strlen(ipcp->ns.resolv); 328 if ((got = write(fd, ipcp->ns.resolv, len)) != len) { 329 if (got == -1) 330 log_Printf(LogERROR, "Failed rewriting %s: write: %s\n", 331 _PATH_RESCONF, strerror(errno)); 332 else 333 log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n", 334 _PATH_RESCONF, (long)got, (long)len); 335 } 336 close(fd); 337 } else 338 log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF, 339 strerror(errno)); 340 } else if (remove(_PATH_RESCONF) == -1) 341 log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF, 342 strerror(errno)); 343 344 } 345 346 int 347 ipcp_Show(struct cmdargs const *arg) 348 { 349 struct ipcp *ipcp = &arg->bundle->ncp.ipcp; 350 351 prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name, 352 State2Nam(ipcp->fsm.state)); 353 if (ipcp->fsm.state == ST_OPENED) { 354 prompt_Printf(arg->prompt, " His side: %s, %s\n", 355 inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto)); 356 prompt_Printf(arg->prompt, " My side: %s, %s\n", 357 inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto)); 358 prompt_Printf(arg->prompt, " Queued packets: %lu\n", 359 (unsigned long)ipcp_QueueLen(ipcp)); 360 } 361 362 prompt_Printf(arg->prompt, "\nDefaults:\n"); 363 prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config" 364 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout, 365 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s", 366 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s"); 367 prompt_Printf(arg->prompt, " My Address: %s\n", 368 ncprange_ntoa(&ipcp->cfg.my_range)); 369 if (ipcp->cfg.HaveTriggerAddress) 370 prompt_Printf(arg->prompt, " Trigger address: %s\n", 371 inet_ntoa(ipcp->cfg.TriggerAddress)); 372 373 prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot " 374 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg), 375 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without"); 376 377 if (iplist_isvalid(&ipcp->cfg.peer_list)) 378 prompt_Printf(arg->prompt, " His Address: %s\n", 379 ipcp->cfg.peer_list.src); 380 else 381 prompt_Printf(arg->prompt, " His Address: %s\n", 382 ncprange_ntoa(&ipcp->cfg.peer_range)); 383 384 prompt_Printf(arg->prompt, " DNS: %s", 385 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ? 386 "none" : inet_ntoa(ipcp->cfg.ns.dns[0])); 387 if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE) 388 prompt_Printf(arg->prompt, ", %s", 389 inet_ntoa(ipcp->cfg.ns.dns[1])); 390 prompt_Printf(arg->prompt, ", %s\n", 391 command_ShowNegval(ipcp->cfg.ns.dns_neg)); 392 prompt_Printf(arg->prompt, " Resolver DNS: %s", 393 ipcp->ns.dns[0].s_addr == INADDR_NONE ? 394 "none" : inet_ntoa(ipcp->ns.dns[0])); 395 if (ipcp->ns.dns[1].s_addr != INADDR_NONE && 396 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) 397 prompt_Printf(arg->prompt, ", %s", 398 inet_ntoa(ipcp->ns.dns[1])); 399 prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ", 400 inet_ntoa(ipcp->cfg.ns.nbns[0])); 401 prompt_Printf(arg->prompt, "%s\n\n", 402 inet_ntoa(ipcp->cfg.ns.nbns[1])); 403 404 throughput_disp(&ipcp->throughput, arg->prompt); 405 406 return 0; 407 } 408 409 int 410 ipcp_vjset(struct cmdargs const *arg) 411 { 412 if (arg->argc != arg->argn+2) 413 return -1; 414 if (!strcasecmp(arg->argv[arg->argn], "slots")) { 415 int slots; 416 417 slots = atoi(arg->argv[arg->argn+1]); 418 if (slots < 4 || slots > 16) 419 return 1; 420 arg->bundle->ncp.ipcp.cfg.vj.slots = slots; 421 return 0; 422 } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) { 423 if (!strcasecmp(arg->argv[arg->argn+1], "on")) 424 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1; 425 else if (!strcasecmp(arg->argv[arg->argn+1], "off")) 426 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0; 427 else 428 return 2; 429 return 0; 430 } 431 return -1; 432 } 433 434 void 435 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l, 436 const struct fsm_parent *parent) 437 { 438 struct hostent *hp; 439 struct in_addr host; 440 char name[MAXHOSTNAMELEN]; 441 static const char * const timer_names[] = 442 {"IPCP restart", "IPCP openmode", "IPCP stopped"}; 443 444 fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP, 445 bundle, l, parent, &ipcp_Callbacks, timer_names); 446 447 ipcp->cfg.vj.slots = DEF_VJ_STATES; 448 ipcp->cfg.vj.slotcomp = 1; 449 memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range); 450 451 host.s_addr = htonl(INADDR_LOOPBACK); 452 ipcp->cfg.netmask.s_addr = INADDR_ANY; 453 if (gethostname(name, sizeof name) == 0) { 454 hp = gethostbyname(name); 455 if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr) 456 memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr); 457 } 458 ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask); 459 ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask); 460 461 iplist_setsrc(&ipcp->cfg.peer_list, ""); 462 ipcp->cfg.HaveTriggerAddress = 0; 463 464 ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE; 465 ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE; 466 ipcp->cfg.ns.dns_neg = 0; 467 ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY; 468 ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY; 469 470 ipcp->cfg.fsm.timeout = DEF_FSMRETRY; 471 ipcp->cfg.fsm.maxreq = DEF_FSMTRIES; 472 ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES; 473 ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED; 474 475 memset(&ipcp->vj, '\0', sizeof ipcp->vj); 476 477 ipcp->ns.resolv = NULL; 478 ipcp->ns.resolv_nons = NULL; 479 ipcp->ns.writable = 1; 480 ipcp_LoadDNS(ipcp); 481 482 throughput_init(&ipcp->throughput, SAMPLE_PERIOD); 483 memset(ipcp->Queue, '\0', sizeof ipcp->Queue); 484 ipcp_Setup(ipcp, INADDR_NONE); 485 } 486 487 void 488 ipcp_Destroy(struct ipcp *ipcp) 489 { 490 throughput_destroy(&ipcp->throughput); 491 492 if (ipcp->ns.resolv != NULL) { 493 free(ipcp->ns.resolv); 494 ipcp->ns.resolv = NULL; 495 } 496 if (ipcp->ns.resolv_nons != NULL) { 497 free(ipcp->ns.resolv_nons); 498 ipcp->ns.resolv_nons = NULL; 499 } 500 } 501 502 void 503 ipcp_SetLink(struct ipcp *ipcp, struct link *l) 504 { 505 ipcp->fsm.link = l; 506 } 507 508 void 509 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask) 510 { 511 struct iface *iface = ipcp->fsm.bundle->iface; 512 struct ncpaddr ipaddr; 513 struct in_addr peer; 514 int pos; 515 unsigned n; 516 517 ipcp->fsm.open_mode = 0; 518 ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; 519 520 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 521 /* Try to give the peer a previously configured IP address */ 522 for (n = 0; n < iface->addrs; n++) { 523 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 524 continue; 525 if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) { 526 ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos)); 527 break; 528 } 529 } 530 if (n == iface->addrs) 531 /* Ok, so none of 'em fit.... pick a random one */ 532 ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list)); 533 534 ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr); 535 } 536 537 ipcp->heis1172 = 0; 538 ipcp->peer_req = 0; 539 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 540 ipcp->peer_compproto = 0; 541 542 if (ipcp->cfg.HaveTriggerAddress) { 543 /* 544 * Some implementations of PPP require that we send a 545 * *special* value as our address, even though the rfc specifies 546 * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). 547 */ 548 ipcp->my_ip = ipcp->cfg.TriggerAddress; 549 log_Printf(LogIPCP, "Using trigger address %s\n", 550 inet_ntoa(ipcp->cfg.TriggerAddress)); 551 } else { 552 /* 553 * Otherwise, if we've used an IP number before and it's still within 554 * the network specified on the ``set ifaddr'' line, we really 555 * want to keep that IP number so that we can keep any existing 556 * connections that are bound to that IP. 557 */ 558 for (n = 0; n < iface->addrs; n++) { 559 ncprange_getaddr(&iface->addr[n].ifa, &ipaddr); 560 if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) { 561 ncpaddr_getip4(&ipaddr, &ipcp->my_ip); 562 break; 563 } 564 } 565 if (n == iface->addrs) 566 ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip); 567 } 568 569 if (IsEnabled(ipcp->cfg.vj.neg) 570 #ifndef NORADIUS 571 || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) 572 #endif 573 ) 574 ipcp->my_compproto = (PROTO_VJCOMP << 16) + 575 ((ipcp->cfg.vj.slots - 1) << 8) + 576 ipcp->cfg.vj.slotcomp; 577 else 578 ipcp->my_compproto = 0; 579 sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); 580 581 ipcp->peer_reject = 0; 582 ipcp->my_reject = 0; 583 584 /* Copy startup values into ipcp->ns.dns */ 585 if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE) 586 memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns); 587 } 588 589 static int 590 numaddresses(struct in_addr mask) 591 { 592 u_int32_t bit, haddr; 593 int n; 594 595 haddr = ntohl(mask.s_addr); 596 bit = 1; 597 n = 1; 598 599 do { 600 if (!(haddr & bit)) 601 n <<= 1; 602 } while (bit <<= 1); 603 604 return n; 605 } 606 607 static int 608 ipcp_proxyarp(struct ipcp *ipcp, 609 int (*proxyfun)(struct bundle *, struct in_addr), 610 const struct iface_addr *addr) 611 { 612 struct bundle *bundle = ipcp->fsm.bundle; 613 struct in_addr peer, mask, ip; 614 int n, ret; 615 616 if (!ncpaddr_getip4(&addr->peer, &peer)) { 617 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); 618 return 0; 619 } 620 621 ret = 0; 622 623 if (Enabled(bundle, OPT_PROXYALL)) { 624 ncprange_getip4mask(&addr->ifa, &mask); 625 if ((n = numaddresses(mask)) > 256) { 626 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", 627 ncprange_ntoa(&addr->ifa)); 628 return 0; 629 } 630 ip.s_addr = peer.s_addr & mask.s_addr; 631 if (n >= 4) { 632 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 633 n -= 2; 634 } 635 while (n) { 636 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { 637 if (!(ret = (*proxyfun)(bundle, ip))) 638 break; 639 n--; 640 } 641 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 642 } 643 ret = !n; 644 } else if (Enabled(bundle, OPT_PROXY)) 645 ret = (*proxyfun)(bundle, peer); 646 647 return ret; 648 } 649 650 static int 651 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, 652 struct in_addr hisaddr) 653 { 654 struct bundle *bundle = ipcp->fsm.bundle; 655 struct ncpaddr myncpaddr, hisncpaddr; 656 struct ncprange myrange; 657 struct in_addr mask; 658 struct sockaddr_storage ssdst, ssgw, ssmask; 659 struct sockaddr *sadst, *sagw, *samask; 660 661 sadst = (struct sockaddr *)&ssdst; 662 sagw = (struct sockaddr *)&ssgw; 663 samask = (struct sockaddr *)&ssmask; 664 665 ncpaddr_setip4(&hisncpaddr, hisaddr); 666 ncpaddr_setip4(&myncpaddr, myaddr); 667 ncprange_sethost(&myrange, &myncpaddr); 668 669 mask = addr2mask(myaddr); 670 671 if (ipcp->ifmask.s_addr != INADDR_ANY && 672 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) 673 ncprange_setip4mask(&myrange, ipcp->ifmask); 674 675 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, 676 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) 677 return 0; 678 679 if (!Enabled(bundle, OPT_IFACEALIAS)) 680 iface_Clear(bundle->iface, &bundle->ncp, AF_INET, 681 IFACE_CLEAR_ALIASES|IFACE_SYSTEM); 682 683 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { 684 ncprange_getsa(&myrange, &ssgw, &ssmask); 685 ncpaddr_getsa(&hisncpaddr, &ssdst); 686 rt_Update(bundle, sadst, sagw, samask); 687 } 688 689 if (Enabled(bundle, OPT_SROUTES)) 690 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); 691 692 #ifndef NORADIUS 693 if (bundle->radius.valid) 694 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); 695 #endif 696 697 return 1; /* Ok */ 698 } 699 700 static struct in_addr 701 ChooseHisAddr(struct bundle *bundle, struct in_addr gw) 702 { 703 struct in_addr try; 704 u_long f; 705 706 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { 707 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); 708 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", 709 f, inet_ntoa(try)); 710 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { 711 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); 712 break; 713 } 714 } 715 716 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { 717 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 718 try.s_addr = INADDR_ANY; 719 } 720 721 return try; 722 } 723 724 static void 725 IpcpInitRestartCounter(struct fsm *fp, int what) 726 { 727 /* Set fsm timer load */ 728 struct ipcp *ipcp = fsm2ipcp(fp); 729 730 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; 731 switch (what) { 732 case FSM_REQ_TIMER: 733 fp->restart = ipcp->cfg.fsm.maxreq; 734 break; 735 case FSM_TRM_TIMER: 736 fp->restart = ipcp->cfg.fsm.maxtrm; 737 break; 738 default: 739 fp->restart = 1; 740 break; 741 } 742 } 743 744 static void 745 IpcpSendConfigReq(struct fsm *fp) 746 { 747 /* Send config REQ please */ 748 struct physical *p = link2physical(fp->link); 749 struct ipcp *ipcp = fsm2ipcp(fp); 750 u_char buff[24]; 751 struct fsm_opt *o; 752 753 o = (struct fsm_opt *)buff; 754 755 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { 756 memcpy(o->data, &ipcp->my_ip.s_addr, 4); 757 INC_FSM_OPT(TY_IPADDR, 6, o); 758 } 759 760 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { 761 if (ipcp->heis1172) { 762 u_int16_t proto = PROTO_VJCOMP; 763 764 ua_htons(&proto, o->data); 765 INC_FSM_OPT(TY_COMPPROTO, 4, o); 766 } else { 767 struct compreq req; 768 769 req.proto = htons(ipcp->my_compproto >> 16); 770 req.slots = (ipcp->my_compproto >> 8) & 255; 771 req.compcid = ipcp->my_compproto & 1; 772 memcpy(o->data, &req, 4); 773 INC_FSM_OPT(TY_COMPPROTO, 6, o); 774 } 775 } 776 777 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 778 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { 779 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); 780 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); 781 } 782 783 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { 784 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); 785 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); 786 } 787 } 788 789 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 790 MB_IPCPOUT); 791 } 792 793 static void 794 IpcpSentTerminateReq(struct fsm *fp __unused) 795 { 796 /* Term REQ just sent by FSM */ 797 } 798 799 static void 800 IpcpSendTerminateAck(struct fsm *fp, u_char id) 801 { 802 /* Send Term ACK please */ 803 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); 804 } 805 806 static void 807 IpcpLayerStart(struct fsm *fp) 808 { 809 /* We're about to start up ! */ 810 struct ipcp *ipcp = fsm2ipcp(fp); 811 812 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); 813 throughput_start(&ipcp->throughput, "IPCP throughput", 814 Enabled(fp->bundle, OPT_THROUGHPUT)); 815 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 816 ipcp->peer_req = 0; 817 } 818 819 static void 820 IpcpLayerFinish(struct fsm *fp) 821 { 822 /* We're now down */ 823 struct ipcp *ipcp = fsm2ipcp(fp); 824 825 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); 826 throughput_stop(&ipcp->throughput); 827 throughput_log(&ipcp->throughput, LogIPCP, NULL); 828 } 829 830 /* 831 * Called from iface_Add() via ncp_IfaceAddrAdded() 832 */ 833 void 834 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr) 835 { 836 struct bundle *bundle = ipcp->fsm.bundle; 837 838 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 839 ipcp_proxyarp(ipcp, arp_SetProxy, addr); 840 } 841 842 /* 843 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() 844 */ 845 void 846 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) 847 { 848 struct bundle *bundle = ipcp->fsm.bundle; 849 850 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 851 ipcp_proxyarp(ipcp, arp_ClearProxy, addr); 852 } 853 854 static void 855 IpcpLayerDown(struct fsm *fp) 856 { 857 /* About to come down */ 858 struct ipcp *ipcp = fsm2ipcp(fp); 859 static int recursing; 860 char addr[16]; 861 862 if (!recursing++) { 863 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); 864 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); 865 866 #ifndef NORADIUS 867 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, 868 fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask, 869 &ipcp->throughput); 870 871 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 872 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE, 873 NULL, NULL); 874 #endif 875 876 /* 877 * XXX this stuff should really live in the FSM. Our config should 878 * associate executable sections in files with events. 879 */ 880 if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) { 881 if (bundle_GetLabel(fp->bundle)) { 882 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 883 LINKDOWNFILE, NULL, NULL) < 0) 884 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 885 } else 886 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 887 } 888 889 ipcp_Setup(ipcp, INADDR_NONE); 890 } 891 recursing--; 892 } 893 894 int 895 ipcp_InterfaceUp(struct ipcp *ipcp) 896 { 897 if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) { 898 log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); 899 return 0; 900 } 901 902 if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) { 903 log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n", 904 ipcp->fsm.bundle->iface->name); 905 return 0; 906 } 907 908 #ifndef NONAT 909 if (ipcp->fsm.bundle->NatEnabled) 910 PacketAliasSetAddress(ipcp->my_ip); 911 #endif 912 913 return 1; 914 } 915 916 static int 917 IpcpLayerUp(struct fsm *fp) 918 { 919 /* We're now up */ 920 struct ipcp *ipcp = fsm2ipcp(fp); 921 char tbuff[16]; 922 923 log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); 924 snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); 925 log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", 926 tbuff, inet_ntoa(ipcp->peer_ip)); 927 928 if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) 929 sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); 930 931 if (!ipcp_InterfaceUp(ipcp)) 932 return 0; 933 934 #ifndef NORADIUS 935 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links, 936 RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput); 937 938 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 939 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE, 940 NULL, NULL); 941 #endif 942 943 /* 944 * XXX this stuff should really live in the FSM. Our config should 945 * associate executable sections in files with events. 946 */ 947 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { 948 if (bundle_GetLabel(fp->bundle)) { 949 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 950 LINKUPFILE, NULL, NULL) < 0) 951 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 952 } else 953 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 954 } 955 956 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 957 log_DisplayPrompts(); 958 959 return 1; 960 } 961 962 static void 963 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) 964 { 965 struct bundle *bundle = ipcp->fsm.bundle; 966 struct iface *iface = bundle->iface; 967 struct in_addr myaddr, peer; 968 unsigned n; 969 970 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 971 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 972 if (ip.s_addr == INADDR_ANY || 973 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || 974 !ipcp_SetIPaddress(ipcp, myaddr, ip)) { 975 log_Printf(LogIPCP, "%s: Address invalid or already in use\n", 976 inet_ntoa(ip)); 977 /* 978 * If we've already had a valid address configured for the peer, 979 * try NAKing with that so that we don't have to upset things 980 * too much. 981 */ 982 for (n = 0; n < iface->addrs; n++) { 983 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 984 continue; 985 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { 986 ipcp->peer_ip = peer; 987 break; 988 } 989 } 990 991 if (n == iface->addrs) { 992 /* Just pick an IP number from our list */ 993 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); 994 } 995 996 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 997 *dec->rejend++ = TY_IPADDR; 998 *dec->rejend++ = 6; 999 memcpy(dec->rejend, &ip.s_addr, 4); 1000 dec->rejend += 4; 1001 } else { 1002 *dec->nakend++ = TY_IPADDR; 1003 *dec->nakend++ = 6; 1004 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1005 dec->nakend += 4; 1006 } 1007 return; 1008 } 1009 } else if (ip.s_addr == INADDR_ANY || 1010 !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { 1011 /* 1012 * If the destination address is not acceptable, NAK with what we 1013 * want to use. 1014 */ 1015 *dec->nakend++ = TY_IPADDR; 1016 *dec->nakend++ = 6; 1017 for (n = 0; n < iface->addrs; n++) 1018 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { 1019 /* We prefer the already-configured address */ 1020 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); 1021 break; 1022 } 1023 1024 if (n == iface->addrs) 1025 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1026 1027 dec->nakend += 4; 1028 return; 1029 } 1030 1031 ipcp->peer_ip = ip; 1032 *dec->ackend++ = TY_IPADDR; 1033 *dec->ackend++ = 6; 1034 memcpy(dec->ackend, &ip.s_addr, 4); 1035 dec->ackend += 4; 1036 } 1037 1038 static void 1039 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 1040 struct fsm_decode *dec) 1041 { 1042 /* Deal with incoming PROTO_IPCP */ 1043 struct ncpaddr ncpaddr; 1044 struct ipcp *ipcp = fsm2ipcp(fp); 1045 int gotdnsnak; 1046 u_int32_t compproto; 1047 struct compreq *pcomp; 1048 struct in_addr ipaddr, dstipaddr, have_ip; 1049 char tbuff[100], tbuff2[100]; 1050 struct fsm_opt *opt, nak; 1051 1052 gotdnsnak = 0; 1053 1054 while (end - cp >= (int)sizeof(opt->hdr)) { 1055 if ((opt = fsm_readopt(&cp)) == NULL) 1056 break; 1057 1058 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), 1059 opt->hdr.len); 1060 1061 switch (opt->hdr.id) { 1062 case TY_IPADDR: /* RFC1332 */ 1063 memcpy(&ipaddr.s_addr, opt->data, 4); 1064 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1065 1066 switch (mode_type) { 1067 case MODE_REQ: 1068 ipcp->peer_req = 1; 1069 ipcp_ValidateReq(ipcp, ipaddr, dec); 1070 break; 1071 1072 case MODE_NAK: 1073 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { 1074 /* Use address suggested by peer */ 1075 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, 1076 inet_ntoa(ipcp->my_ip)); 1077 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); 1078 ipcp->my_ip = ipaddr; 1079 ncpaddr_setip4(&ncpaddr, ipcp->my_ip); 1080 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); 1081 } else { 1082 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, 1083 "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); 1084 fsm_Close(&ipcp->fsm); 1085 } 1086 break; 1087 1088 case MODE_REJ: 1089 ipcp->peer_reject |= (1 << opt->hdr.id); 1090 break; 1091 } 1092 break; 1093 1094 case TY_COMPPROTO: 1095 pcomp = (struct compreq *)opt->data; 1096 compproto = (ntohs(pcomp->proto) << 16) + ((int)pcomp->slots << 8) + 1097 pcomp->compcid; 1098 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); 1099 1100 switch (mode_type) { 1101 case MODE_REQ: 1102 if (!IsAccepted(ipcp->cfg.vj.neg)) 1103 fsm_rej(dec, opt); 1104 else { 1105 switch (opt->hdr.len) { 1106 case 4: /* RFC1172 */ 1107 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1108 log_Printf(LogWARN, "Peer is speaking RFC1172 compression " 1109 "protocol !\n"); 1110 ipcp->heis1172 = 1; 1111 ipcp->peer_compproto = compproto; 1112 fsm_ack(dec, opt); 1113 } else { 1114 pcomp->proto = htons(PROTO_VJCOMP); 1115 nak.hdr.id = TY_COMPPROTO; 1116 nak.hdr.len = 4; 1117 memcpy(nak.data, &pcomp, 2); 1118 fsm_nak(dec, &nak); 1119 } 1120 break; 1121 case 6: /* RFC1332 */ 1122 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1123 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1124 if (pcomp->slots >= MIN_VJ_STATES) { 1125 /* Ok, we can do that */ 1126 ipcp->peer_compproto = compproto; 1127 ipcp->heis1172 = 0; 1128 fsm_ack(dec, opt); 1129 } else { 1130 /* Get as close as we can to what he wants */ 1131 ipcp->heis1172 = 0; 1132 pcomp->slots = MIN_VJ_STATES; 1133 nak.hdr.id = TY_COMPPROTO; 1134 nak.hdr.len = 4; 1135 memcpy(nak.data, &pcomp, 2); 1136 fsm_nak(dec, &nak); 1137 } 1138 } else { 1139 /* What we really want */ 1140 pcomp->proto = htons(PROTO_VJCOMP); 1141 pcomp->slots = DEF_VJ_STATES; 1142 pcomp->compcid = 1; 1143 nak.hdr.id = TY_COMPPROTO; 1144 nak.hdr.len = 6; 1145 memcpy(nak.data, &pcomp, sizeof pcomp); 1146 fsm_nak(dec, &nak); 1147 } 1148 break; 1149 default: 1150 fsm_rej(dec, opt); 1151 break; 1152 } 1153 } 1154 break; 1155 1156 case MODE_NAK: 1157 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1158 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1159 if (pcomp->slots < MIN_VJ_STATES) 1160 pcomp->slots = MIN_VJ_STATES; 1161 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + 1162 pcomp->compcid; 1163 } else 1164 compproto = 0; 1165 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", 1166 tbuff, ipcp->my_compproto, compproto); 1167 ipcp->my_compproto = compproto; 1168 break; 1169 1170 case MODE_REJ: 1171 ipcp->peer_reject |= (1 << opt->hdr.id); 1172 break; 1173 } 1174 break; 1175 1176 case TY_IPADDRS: /* RFC1172 */ 1177 memcpy(&ipaddr.s_addr, opt->data, 4); 1178 memcpy(&dstipaddr.s_addr, opt->data + 4, 4); 1179 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); 1180 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); 1181 1182 switch (mode_type) { 1183 case MODE_REQ: 1184 fsm_rej(dec, opt); 1185 break; 1186 1187 case MODE_NAK: 1188 case MODE_REJ: 1189 break; 1190 } 1191 break; 1192 1193 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ 1194 case TY_SECONDARY_DNS: 1195 memcpy(&ipaddr.s_addr, opt->data, 4); 1196 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1197 1198 switch (mode_type) { 1199 case MODE_REQ: 1200 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { 1201 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1202 fsm_rej(dec, opt); 1203 break; 1204 } 1205 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; 1206 1207 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && 1208 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { 1209 /* Swap 'em 'round */ 1210 ipcp->ns.dns[0] = ipcp->ns.dns[1]; 1211 ipcp->ns.dns[1] = have_ip; 1212 have_ip = ipcp->ns.dns[0]; 1213 } 1214 1215 if (ipaddr.s_addr != have_ip.s_addr) { 1216 /* 1217 * The client has got the DNS stuff wrong (first request) so 1218 * we'll tell 'em how it is 1219 */ 1220 nak.hdr.id = opt->hdr.id; 1221 nak.hdr.len = 6; 1222 memcpy(nak.data, &have_ip.s_addr, 4); 1223 fsm_nak(dec, &nak); 1224 } else { 1225 /* 1226 * Otherwise they have it right (this time) so we send a ack packet 1227 * back confirming it... end of story 1228 */ 1229 fsm_ack(dec, opt); 1230 } 1231 break; 1232 1233 case MODE_NAK: 1234 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 1235 gotdnsnak = 1; 1236 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, 1237 opt->data, 4); 1238 } 1239 break; 1240 1241 case MODE_REJ: /* Can't do much, stop asking */ 1242 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1243 break; 1244 } 1245 break; 1246 1247 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ 1248 case TY_SECONDARY_NBNS: 1249 memcpy(&ipaddr.s_addr, opt->data, 4); 1250 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1251 1252 switch (mode_type) { 1253 case MODE_REQ: 1254 have_ip.s_addr = 1255 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; 1256 1257 if (have_ip.s_addr == INADDR_ANY) { 1258 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); 1259 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1260 fsm_rej(dec, opt); 1261 break; 1262 } 1263 1264 if (ipaddr.s_addr != have_ip.s_addr) { 1265 nak.hdr.id = opt->hdr.id; 1266 nak.hdr.len = 6; 1267 memcpy(nak.data, &have_ip.s_addr, 4); 1268 fsm_nak(dec, &nak); 1269 } else 1270 fsm_ack(dec, opt); 1271 break; 1272 1273 case MODE_NAK: 1274 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); 1275 break; 1276 1277 case MODE_REJ: 1278 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); 1279 break; 1280 } 1281 break; 1282 1283 default: 1284 if (mode_type != MODE_NOP) { 1285 ipcp->my_reject |= (1 << opt->hdr.id); 1286 fsm_rej(dec, opt); 1287 } 1288 break; 1289 } 1290 } 1291 1292 if (gotdnsnak) { 1293 if (ipcp->ns.writable) { 1294 log_Printf(LogDEBUG, "Updating resolver\n"); 1295 if (!ipcp_WriteDNS(ipcp)) { 1296 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); 1297 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); 1298 } else 1299 bundle_AdjustDNS(fp->bundle); 1300 } else { 1301 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); 1302 bundle_AdjustDNS(fp->bundle); 1303 } 1304 } 1305 1306 if (mode_type != MODE_NOP) { 1307 if (mode_type == MODE_REQ && !ipcp->peer_req) { 1308 if (dec->rejend == dec->rej && dec->nakend == dec->nak) { 1309 /* 1310 * Pretend the peer has requested an IP. 1311 * We do this to ensure that we only send one NAK if the only 1312 * reason for the NAK is because the peer isn't sending a 1313 * TY_IPADDR REQ. This stops us from repeatedly trying to tell 1314 * the peer that we have to have an IP address on their end. 1315 */ 1316 ipcp->peer_req = 1; 1317 } 1318 ipaddr.s_addr = INADDR_ANY; 1319 ipcp_ValidateReq(ipcp, ipaddr, dec); 1320 } 1321 fsm_opt_normalise(dec); 1322 } 1323 } 1324 1325 extern struct mbuf * 1326 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1327 { 1328 /* Got PROTO_IPCP from link */ 1329 m_settype(bp, MB_IPCPIN); 1330 if (bundle_Phase(bundle) == PHASE_NETWORK) 1331 fsm_Input(&bundle->ncp.ipcp.fsm, bp); 1332 else { 1333 if (bundle_Phase(bundle) < PHASE_NETWORK) 1334 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", 1335 l->name, bundle_PhaseName(bundle)); 1336 m_freem(bp); 1337 } 1338 return NULL; 1339 } 1340 1341 int 1342 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) 1343 { 1344 struct ipcp *ipcp = &bundle->ncp.ipcp; 1345 struct in_addr myaddr; 1346 1347 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1348 iplist_reset(&ipcp->cfg.peer_list); 1349 ipcp->peer_ip = hisaddr; 1350 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); 1351 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1352 1353 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); 1354 } 1355 1356 int 1357 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) 1358 { 1359 struct in_addr myaddr; 1360 struct ncp *ncp = &bundle->ncp; 1361 struct ipcp *ipcp = &ncp->ipcp; 1362 struct ncpaddr ncpaddr; 1363 1364 /* Use `hisaddr' for the peers address (set iface if `setaddr') */ 1365 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1366 iplist_reset(&ipcp->cfg.peer_list); 1367 if (strpbrk(hisaddr, ",-")) { 1368 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); 1369 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 1370 iplist_setrandpos(&ipcp->cfg.peer_list); 1371 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); 1372 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1373 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); 1374 return 0; 1375 } 1376 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); 1377 } else { 1378 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); 1379 return 0; 1380 } 1381 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { 1382 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { 1383 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); 1384 return 0; 1385 } 1386 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1387 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 1388 1389 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) 1390 return 0; 1391 } else 1392 return 0; 1393 1394 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); 1395 bundle_AdjustFilters(bundle, NULL, &ncpaddr); 1396 1397 return 1; /* Ok */ 1398 } 1399 1400 struct in_addr 1401 addr2mask(struct in_addr addr) 1402 { 1403 u_int32_t haddr = ntohl(addr.s_addr); 1404 1405 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : 1406 IN_CLASSB(haddr) ? IN_CLASSB_NET : 1407 IN_CLASSC_NET; 1408 addr.s_addr = htonl(haddr); 1409 1410 return addr; 1411 } 1412 1413 size_t 1414 ipcp_QueueLen(struct ipcp *ipcp) 1415 { 1416 struct mqueue *q; 1417 size_t result; 1418 1419 result = 0; 1420 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) 1421 result += q->len; 1422 1423 return result; 1424 } 1425 1426 int 1427 ipcp_PushPacket(struct ipcp *ipcp, struct link *l) 1428 { 1429 struct bundle *bundle = ipcp->fsm.bundle; 1430 struct mqueue *queue; 1431 struct mbuf *bp; 1432 int m_len; 1433 u_int32_t secs = 0; 1434 unsigned alivesecs = 0; 1435 1436 if (ipcp->fsm.state != ST_OPENED) 1437 return 0; 1438 1439 /* 1440 * If ccp is not open but is required, do nothing. 1441 */ 1442 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 1443 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 1444 return 0; 1445 } 1446 1447 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; 1448 do { 1449 if (queue->top) { 1450 bp = m_dequeue(queue); 1451 bp = mbuf_Read(bp, &secs, sizeof secs); 1452 bp = m_pullup(bp); 1453 m_len = m_length(bp); 1454 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, 1455 &alivesecs)) { 1456 if (secs == 0) 1457 secs = alivesecs; 1458 bundle_StartIdleTimer(bundle, secs); 1459 } 1460 link_PushPacket(l, bp, bundle, 0, PROTO_IP); 1461 ipcp_AddOutOctets(ipcp, m_len); 1462 return 1; 1463 } 1464 } while (queue-- != ipcp->Queue); 1465 1466 return 0; 1467 } 1468