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 */ 30 31 #include <sys/param.h> 32 #include <netinet/in_systm.h> 33 #include <netinet/in.h> 34 #include <netinet/ip.h> 35 #include <arpa/inet.h> 36 #include <sys/socket.h> 37 #include <net/if.h> 38 #include <net/route.h> 39 #include <netdb.h> 40 #include <sys/un.h> 41 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <resolv.h> 45 #include <stdarg.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <sys/stat.h> 49 #include <termios.h> 50 #include <unistd.h> 51 52 #ifndef NONAT 53 #ifdef LOCALNAT 54 #include "alias.h" 55 #else 56 #include <alias.h> 57 #endif 58 #endif 59 60 #include "layer.h" 61 #include "ua.h" 62 #include "defs.h" 63 #include "command.h" 64 #include "mbuf.h" 65 #include "log.h" 66 #include "timer.h" 67 #include "fsm.h" 68 #include "proto.h" 69 #include "iplist.h" 70 #include "throughput.h" 71 #include "slcompress.h" 72 #include "lqr.h" 73 #include "hdlc.h" 74 #include "lcp.h" 75 #include "ncpaddr.h" 76 #include "ip.h" 77 #include "ipcp.h" 78 #include "filter.h" 79 #include "descriptor.h" 80 #include "vjcomp.h" 81 #include "async.h" 82 #include "ccp.h" 83 #include "link.h" 84 #include "physical.h" 85 #include "mp.h" 86 #ifndef NORADIUS 87 #include "radius.h" 88 #endif 89 #include "ipv6cp.h" 90 #include "ncp.h" 91 #include "bundle.h" 92 #include "id.h" 93 #include "arp.h" 94 #include "systems.h" 95 #include "prompt.h" 96 #include "route.h" 97 #include "iface.h" 98 99 #undef REJECTED 100 #define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) 101 #define issep(ch) ((ch) == ' ' || (ch) == '\t') 102 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') 103 104 struct compreq { 105 u_short proto; 106 u_char slots; 107 u_char compcid; 108 }; 109 110 static int IpcpLayerUp(struct fsm *); 111 static void IpcpLayerDown(struct fsm *); 112 static void IpcpLayerStart(struct fsm *); 113 static void IpcpLayerFinish(struct fsm *); 114 static void IpcpInitRestartCounter(struct fsm *, int); 115 static void IpcpSendConfigReq(struct fsm *); 116 static void IpcpSentTerminateReq(struct fsm *); 117 static void IpcpSendTerminateAck(struct fsm *, u_char); 118 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 119 struct fsm_decode *); 120 121 static struct fsm_callbacks ipcp_Callbacks = { 122 IpcpLayerUp, 123 IpcpLayerDown, 124 IpcpLayerStart, 125 IpcpLayerFinish, 126 IpcpInitRestartCounter, 127 IpcpSendConfigReq, 128 IpcpSentTerminateReq, 129 IpcpSendTerminateAck, 130 IpcpDecodeConfig, 131 fsm_NullRecvResetReq, 132 fsm_NullRecvResetAck 133 }; 134 135 static const char * 136 protoname(int proto) 137 { 138 static struct { 139 int id; 140 const char *txt; 141 } cftypes[] = { 142 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 143 { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */ 144 { 2, "COMPPROTO" }, /* IP-Compression-Protocol */ 145 { 3, "IPADDR" }, /* IP-Address */ 146 { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */ 147 { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */ 148 { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */ 149 { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */ 150 }; 151 unsigned f; 152 153 for (f = 0; f < NELEM(cftypes); f++) 154 if (cftypes[f].id == proto) 155 return cftypes[f].txt; 156 157 return NumStr(proto, NULL, 0); 158 } 159 160 void 161 ipcp_AddInOctets(struct ipcp *ipcp, int n) 162 { 163 throughput_addin(&ipcp->throughput, n); 164 } 165 166 void 167 ipcp_AddOutOctets(struct ipcp *ipcp, int n) 168 { 169 throughput_addout(&ipcp->throughput, n); 170 } 171 172 void 173 ipcp_LoadDNS(struct ipcp *ipcp) 174 { 175 int fd; 176 177 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE; 178 179 if (ipcp->ns.resolv != NULL) { 180 free(ipcp->ns.resolv); 181 ipcp->ns.resolv = NULL; 182 } 183 if (ipcp->ns.resolv_nons != NULL) { 184 free(ipcp->ns.resolv_nons); 185 ipcp->ns.resolv_nons = NULL; 186 } 187 ipcp->ns.resolver = 0; 188 189 if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) { 190 struct stat st; 191 192 if (fstat(fd, &st) == 0) { 193 ssize_t got; 194 195 if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL) 196 log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n", 197 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 198 else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) { 199 log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n", 200 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 201 free(ipcp->ns.resolv_nons); 202 ipcp->ns.resolv_nons = NULL; 203 } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) { 204 if (got == -1) 205 log_Printf(LogERROR, "Failed to read %s: %s\n", 206 _PATH_RESCONF, strerror(errno)); 207 else 208 log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n", 209 _PATH_RESCONF, (unsigned long)got, 210 (unsigned long)st.st_size); 211 free(ipcp->ns.resolv_nons); 212 ipcp->ns.resolv_nons = NULL; 213 free(ipcp->ns.resolv); 214 ipcp->ns.resolv = NULL; 215 } else { 216 char *cp, *cp_nons, *ncp, ch; 217 int n; 218 219 ipcp->ns.resolv[st.st_size] = '\0'; 220 ipcp->ns.resolver = 1; 221 222 cp_nons = ipcp->ns.resolv_nons; 223 cp = ipcp->ns.resolv; 224 n = 0; 225 226 while ((ncp = strstr(cp, "nameserver")) != NULL) { 227 if (ncp != cp) { 228 memcpy(cp_nons, cp, ncp - cp); 229 cp_nons += ncp - cp; 230 } 231 if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) { 232 memcpy(cp_nons, ncp, 9); 233 cp_nons += 9; 234 cp = ncp + 9; /* Can't match "nameserver" at cp... */ 235 continue; 236 } 237 238 for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */ 239 ; 240 241 for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */ 242 ; 243 244 ch = *ncp; 245 *ncp = '\0'; 246 if (n < 2 && inet_aton(cp, ipcp->ns.dns)) 247 n++; 248 *ncp = ch; 249 250 if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */ 251 cp = ncp + strlen(ncp); 252 else 253 cp++; 254 } 255 strcpy(cp_nons, cp); /* Copy the end - including the NUL */ 256 cp_nons += strlen(cp_nons) - 1; 257 while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n') 258 *cp_nons-- = '\0'; 259 if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) { 260 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 261 ipcp->ns.dns[1].s_addr = INADDR_ANY; 262 } 263 bundle_AdjustDNS(ipcp->fsm.bundle); 264 } 265 } else 266 log_Printf(LogERROR, "Failed to stat opened %s: %s\n", 267 _PATH_RESCONF, strerror(errno)); 268 269 close(fd); 270 } 271 } 272 273 int 274 ipcp_WriteDNS(struct ipcp *ipcp) 275 { 276 const char *paddr; 277 mode_t mask; 278 FILE *fp; 279 280 if (ipcp->ns.dns[0].s_addr == INADDR_ANY && 281 ipcp->ns.dns[1].s_addr == INADDR_ANY) { 282 log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n", 283 _PATH_RESCONF); 284 return 0; 285 } 286 287 if (ipcp->ns.dns[0].s_addr == INADDR_ANY) { 288 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 289 ipcp->ns.dns[1].s_addr = INADDR_ANY; 290 } 291 292 mask = umask(022); 293 if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) { 294 umask(mask); 295 if (ipcp->ns.resolv_nons) 296 fputs(ipcp->ns.resolv_nons, fp); 297 paddr = inet_ntoa(ipcp->ns.dns[0]); 298 log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr); 299 fprintf(fp, "\nnameserver %s\n", paddr); 300 if (ipcp->ns.dns[1].s_addr != INADDR_ANY && 301 ipcp->ns.dns[1].s_addr != INADDR_NONE && 302 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) { 303 paddr = inet_ntoa(ipcp->ns.dns[1]); 304 log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr); 305 fprintf(fp, "nameserver %s\n", paddr); 306 } 307 if (fclose(fp) == EOF) { 308 log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF, 309 strerror(errno)); 310 return 0; 311 } 312 } else 313 umask(mask); 314 315 return 1; 316 } 317 318 void 319 ipcp_RestoreDNS(struct ipcp *ipcp) 320 { 321 if (ipcp->ns.resolver) { 322 ssize_t got, len; 323 int fd; 324 325 if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) { 326 len = strlen(ipcp->ns.resolv); 327 if ((got = write(fd, ipcp->ns.resolv, len)) != len) { 328 if (got == -1) 329 log_Printf(LogERROR, "Failed rewriting %s: write: %s\n", 330 _PATH_RESCONF, strerror(errno)); 331 else 332 log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n", 333 _PATH_RESCONF, (long)got, (long)len); 334 } 335 close(fd); 336 } else 337 log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF, 338 strerror(errno)); 339 } else if (remove(_PATH_RESCONF) == -1) 340 log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF, 341 strerror(errno)); 342 343 } 344 345 int 346 ipcp_Show(struct cmdargs const *arg) 347 { 348 struct ipcp *ipcp = &arg->bundle->ncp.ipcp; 349 350 prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name, 351 State2Nam(ipcp->fsm.state)); 352 if (ipcp->fsm.state == ST_OPENED) { 353 prompt_Printf(arg->prompt, " His side: %s, %s\n", 354 inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto)); 355 prompt_Printf(arg->prompt, " My side: %s, %s\n", 356 inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto)); 357 prompt_Printf(arg->prompt, " Queued packets: %lu\n", 358 (unsigned long)ipcp_QueueLen(ipcp)); 359 } 360 361 prompt_Printf(arg->prompt, "\nDefaults:\n"); 362 prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config" 363 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout, 364 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s", 365 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s"); 366 prompt_Printf(arg->prompt, " My Address: %s\n", 367 ncprange_ntoa(&ipcp->cfg.my_range)); 368 if (ipcp->cfg.HaveTriggerAddress) 369 prompt_Printf(arg->prompt, " Trigger address: %s\n", 370 inet_ntoa(ipcp->cfg.TriggerAddress)); 371 372 prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot " 373 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg), 374 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without"); 375 376 if (iplist_isvalid(&ipcp->cfg.peer_list)) 377 prompt_Printf(arg->prompt, " His Address: %s\n", 378 ipcp->cfg.peer_list.src); 379 else 380 prompt_Printf(arg->prompt, " His Address: %s\n", 381 ncprange_ntoa(&ipcp->cfg.peer_range)); 382 383 prompt_Printf(arg->prompt, " DNS: %s", 384 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ? 385 "none" : inet_ntoa(ipcp->cfg.ns.dns[0])); 386 if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE) 387 prompt_Printf(arg->prompt, ", %s", 388 inet_ntoa(ipcp->cfg.ns.dns[1])); 389 prompt_Printf(arg->prompt, ", %s\n", 390 command_ShowNegval(ipcp->cfg.ns.dns_neg)); 391 prompt_Printf(arg->prompt, " Resolver DNS: %s", 392 ipcp->ns.dns[0].s_addr == INADDR_NONE ? 393 "none" : inet_ntoa(ipcp->ns.dns[0])); 394 if (ipcp->ns.dns[1].s_addr != INADDR_NONE && 395 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) 396 prompt_Printf(arg->prompt, ", %s", 397 inet_ntoa(ipcp->ns.dns[1])); 398 prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ", 399 inet_ntoa(ipcp->cfg.ns.nbns[0])); 400 prompt_Printf(arg->prompt, "%s\n\n", 401 inet_ntoa(ipcp->cfg.ns.nbns[1])); 402 403 throughput_disp(&ipcp->throughput, arg->prompt); 404 405 return 0; 406 } 407 408 int 409 ipcp_vjset(struct cmdargs const *arg) 410 { 411 if (arg->argc != arg->argn+2) 412 return -1; 413 if (!strcasecmp(arg->argv[arg->argn], "slots")) { 414 int slots; 415 416 slots = atoi(arg->argv[arg->argn+1]); 417 if (slots < 4 || slots > 16) 418 return 1; 419 arg->bundle->ncp.ipcp.cfg.vj.slots = slots; 420 return 0; 421 } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) { 422 if (!strcasecmp(arg->argv[arg->argn+1], "on")) 423 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1; 424 else if (!strcasecmp(arg->argv[arg->argn+1], "off")) 425 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0; 426 else 427 return 2; 428 return 0; 429 } 430 return -1; 431 } 432 433 void 434 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l, 435 const struct fsm_parent *parent) 436 { 437 struct hostent *hp; 438 struct in_addr host; 439 char name[MAXHOSTNAMELEN]; 440 static const char * const timer_names[] = 441 {"IPCP restart", "IPCP openmode", "IPCP stopped"}; 442 443 fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP, 444 bundle, l, parent, &ipcp_Callbacks, timer_names); 445 446 ipcp->cfg.vj.slots = DEF_VJ_STATES; 447 ipcp->cfg.vj.slotcomp = 1; 448 memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range); 449 450 host.s_addr = htonl(INADDR_LOOPBACK); 451 ipcp->cfg.netmask.s_addr = INADDR_ANY; 452 if (gethostname(name, sizeof name) == 0) { 453 hp = gethostbyname(name); 454 if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr) 455 memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr); 456 } 457 ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask); 458 ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask); 459 460 iplist_setsrc(&ipcp->cfg.peer_list, ""); 461 ipcp->cfg.HaveTriggerAddress = 0; 462 463 ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE; 464 ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE; 465 ipcp->cfg.ns.dns_neg = 0; 466 ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY; 467 ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY; 468 469 ipcp->cfg.fsm.timeout = DEF_FSMRETRY; 470 ipcp->cfg.fsm.maxreq = DEF_FSMTRIES; 471 ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES; 472 ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED; 473 474 memset(&ipcp->vj, '\0', sizeof ipcp->vj); 475 476 ipcp->ns.resolv = NULL; 477 ipcp->ns.resolv_nons = NULL; 478 ipcp->ns.writable = 1; 479 ipcp_LoadDNS(ipcp); 480 481 throughput_init(&ipcp->throughput, SAMPLE_PERIOD); 482 memset(ipcp->Queue, '\0', sizeof ipcp->Queue); 483 ipcp_Setup(ipcp, INADDR_NONE); 484 } 485 486 void 487 ipcp_Destroy(struct ipcp *ipcp) 488 { 489 throughput_destroy(&ipcp->throughput); 490 491 if (ipcp->ns.resolv != NULL) { 492 free(ipcp->ns.resolv); 493 ipcp->ns.resolv = NULL; 494 } 495 if (ipcp->ns.resolv_nons != NULL) { 496 free(ipcp->ns.resolv_nons); 497 ipcp->ns.resolv_nons = NULL; 498 } 499 } 500 501 void 502 ipcp_SetLink(struct ipcp *ipcp, struct link *l) 503 { 504 ipcp->fsm.link = l; 505 } 506 507 void 508 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask) 509 { 510 struct iface *iface = ipcp->fsm.bundle->iface; 511 struct ncpaddr ipaddr; 512 struct in_addr peer; 513 int pos; 514 unsigned n; 515 516 ipcp->fsm.open_mode = 0; 517 ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; 518 519 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 520 /* Try to give the peer a previously configured IP address */ 521 for (n = 0; n < iface->addrs; n++) { 522 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 523 continue; 524 if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) { 525 ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos)); 526 break; 527 } 528 } 529 if (n == iface->addrs) 530 /* Ok, so none of 'em fit.... pick a random one */ 531 ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list)); 532 533 ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr); 534 } 535 536 ipcp->heis1172 = 0; 537 ipcp->peer_req = 0; 538 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 539 ipcp->peer_compproto = 0; 540 541 if (ipcp->cfg.HaveTriggerAddress) { 542 /* 543 * Some implementations of PPP require that we send a 544 * *special* value as our address, even though the rfc specifies 545 * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). 546 */ 547 ipcp->my_ip = ipcp->cfg.TriggerAddress; 548 log_Printf(LogIPCP, "Using trigger address %s\n", 549 inet_ntoa(ipcp->cfg.TriggerAddress)); 550 } else { 551 /* 552 * Otherwise, if we've used an IP number before and it's still within 553 * the network specified on the ``set ifaddr'' line, we really 554 * want to keep that IP number so that we can keep any existing 555 * connections that are bound to that IP. 556 */ 557 for (n = 0; n < iface->addrs; n++) { 558 ncprange_getaddr(&iface->addr[n].ifa, &ipaddr); 559 if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) { 560 ncpaddr_getip4(&ipaddr, &ipcp->my_ip); 561 break; 562 } 563 } 564 if (n == iface->addrs) 565 ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip); 566 } 567 568 if (IsEnabled(ipcp->cfg.vj.neg) 569 #ifndef NORADIUS 570 || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) 571 #endif 572 ) 573 ipcp->my_compproto = (PROTO_VJCOMP << 16) + 574 ((ipcp->cfg.vj.slots - 1) << 8) + 575 ipcp->cfg.vj.slotcomp; 576 else 577 ipcp->my_compproto = 0; 578 sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); 579 580 ipcp->peer_reject = 0; 581 ipcp->my_reject = 0; 582 583 /* Copy startup values into ipcp->ns.dns */ 584 if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE) 585 memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns); 586 } 587 588 static int 589 numaddresses(struct in_addr mask) 590 { 591 u_int32_t bit, haddr; 592 int n; 593 594 haddr = ntohl(mask.s_addr); 595 bit = 1; 596 n = 1; 597 598 do { 599 if (!(haddr & bit)) 600 n <<= 1; 601 } while (bit <<= 1); 602 603 return n; 604 } 605 606 static int 607 ipcp_proxyarp(struct ipcp *ipcp, 608 int (*proxyfun)(struct bundle *, struct in_addr), 609 const struct iface_addr *addr) 610 { 611 struct bundle *bundle = ipcp->fsm.bundle; 612 struct in_addr peer, mask, ip; 613 int n, ret; 614 615 mask.s_addr = 0; /* avoid gcc warnings */ 616 617 if (!ncpaddr_getip4(&addr->peer, &peer)) { 618 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); 619 return 0; 620 } 621 622 ret = 0; 623 624 if (Enabled(bundle, OPT_PROXYALL)) { 625 ncprange_getip4mask(&addr->ifa, &mask); 626 if ((n = numaddresses(mask)) > 256) { 627 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", 628 ncprange_ntoa(&addr->ifa)); 629 return 0; 630 } 631 ip.s_addr = peer.s_addr & mask.s_addr; 632 if (n >= 4) { 633 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 634 n -= 2; 635 } 636 while (n) { 637 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { 638 if (!(ret = (*proxyfun)(bundle, ip))) 639 break; 640 n--; 641 } 642 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 643 } 644 ret = !n; 645 } else if (Enabled(bundle, OPT_PROXY)) 646 ret = (*proxyfun)(bundle, peer); 647 648 return ret; 649 } 650 651 static int 652 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, 653 struct in_addr hisaddr) 654 { 655 struct bundle *bundle = ipcp->fsm.bundle; 656 struct ncpaddr myncpaddr, hisncpaddr; 657 struct ncprange myrange; 658 struct in_addr mask; 659 struct sockaddr_storage ssdst, ssgw, ssmask; 660 struct sockaddr *sadst, *sagw, *samask; 661 662 sadst = (struct sockaddr *)&ssdst; 663 sagw = (struct sockaddr *)&ssgw; 664 samask = (struct sockaddr *)&ssmask; 665 666 ncpaddr_setip4(&hisncpaddr, hisaddr); 667 ncpaddr_setip4(&myncpaddr, myaddr); 668 ncprange_sethost(&myrange, &myncpaddr); 669 670 mask = addr2mask(myaddr); 671 672 if (ipcp->ifmask.s_addr != INADDR_ANY && 673 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) 674 ncprange_setip4mask(&myrange, ipcp->ifmask); 675 676 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, 677 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) 678 return 0; 679 680 if (!Enabled(bundle, OPT_IFACEALIAS)) 681 iface_Clear(bundle->iface, &bundle->ncp, AF_INET, 682 IFACE_CLEAR_ALIASES|IFACE_SYSTEM); 683 684 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { 685 ncprange_getsa(&myrange, &ssgw, &ssmask); 686 ncpaddr_getsa(&hisncpaddr, &ssdst); 687 rt_Update(bundle, sadst, sagw, samask); 688 } 689 690 if (Enabled(bundle, OPT_SROUTES)) 691 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); 692 693 #ifndef NORADIUS 694 if (bundle->radius.valid) 695 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); 696 #endif 697 698 return 1; /* Ok */ 699 } 700 701 static struct in_addr 702 ChooseHisAddr(struct bundle *bundle, struct in_addr gw) 703 { 704 struct in_addr try; 705 u_long f; 706 707 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { 708 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); 709 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", 710 f, inet_ntoa(try)); 711 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { 712 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); 713 break; 714 } 715 } 716 717 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { 718 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 719 try.s_addr = INADDR_ANY; 720 } 721 722 return try; 723 } 724 725 static void 726 IpcpInitRestartCounter(struct fsm *fp, int what) 727 { 728 /* Set fsm timer load */ 729 struct ipcp *ipcp = fsm2ipcp(fp); 730 731 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; 732 switch (what) { 733 case FSM_REQ_TIMER: 734 fp->restart = ipcp->cfg.fsm.maxreq; 735 break; 736 case FSM_TRM_TIMER: 737 fp->restart = ipcp->cfg.fsm.maxtrm; 738 break; 739 default: 740 fp->restart = 1; 741 break; 742 } 743 } 744 745 static void 746 IpcpSendConfigReq(struct fsm *fp) 747 { 748 /* Send config REQ please */ 749 struct physical *p = link2physical(fp->link); 750 struct ipcp *ipcp = fsm2ipcp(fp); 751 u_char buff[24]; 752 struct fsm_opt *o; 753 754 o = (struct fsm_opt *)buff; 755 756 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { 757 memcpy(o->data, &ipcp->my_ip.s_addr, 4); 758 INC_FSM_OPT(TY_IPADDR, 6, o); 759 } 760 761 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { 762 if (ipcp->heis1172) { 763 u_int16_t proto = PROTO_VJCOMP; 764 765 ua_htons(&proto, o->data); 766 INC_FSM_OPT(TY_COMPPROTO, 4, o); 767 } else { 768 struct compreq req; 769 770 req.proto = htons(ipcp->my_compproto >> 16); 771 req.slots = (ipcp->my_compproto >> 8) & 255; 772 req.compcid = ipcp->my_compproto & 1; 773 memcpy(o->data, &req, 4); 774 INC_FSM_OPT(TY_COMPPROTO, 6, o); 775 } 776 } 777 778 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 779 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { 780 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); 781 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); 782 } 783 784 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { 785 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); 786 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); 787 } 788 } 789 790 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 791 MB_IPCPOUT); 792 } 793 794 static void 795 IpcpSentTerminateReq(struct fsm *fp __unused) 796 { 797 /* Term REQ just sent by FSM */ 798 } 799 800 static void 801 IpcpSendTerminateAck(struct fsm *fp, u_char id) 802 { 803 /* Send Term ACK please */ 804 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); 805 } 806 807 static void 808 IpcpLayerStart(struct fsm *fp) 809 { 810 /* We're about to start up ! */ 811 struct ipcp *ipcp = fsm2ipcp(fp); 812 813 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); 814 throughput_start(&ipcp->throughput, "IPCP throughput", 815 Enabled(fp->bundle, OPT_THROUGHPUT)); 816 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 817 ipcp->peer_req = 0; 818 } 819 820 static void 821 IpcpLayerFinish(struct fsm *fp) 822 { 823 /* We're now down */ 824 struct ipcp *ipcp = fsm2ipcp(fp); 825 826 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); 827 throughput_stop(&ipcp->throughput); 828 throughput_log(&ipcp->throughput, LogIPCP, NULL); 829 } 830 831 /* 832 * Called from iface_Add() via ncp_IfaceAddrAdded() 833 */ 834 void 835 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr) 836 { 837 struct bundle *bundle = ipcp->fsm.bundle; 838 839 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 840 ipcp_proxyarp(ipcp, arp_SetProxy, addr); 841 } 842 843 /* 844 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() 845 */ 846 void 847 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) 848 { 849 struct bundle *bundle = ipcp->fsm.bundle; 850 851 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 852 ipcp_proxyarp(ipcp, arp_ClearProxy, addr); 853 } 854 855 static void 856 IpcpLayerDown(struct fsm *fp) 857 { 858 /* About to come down */ 859 struct ipcp *ipcp = fsm2ipcp(fp); 860 static int recursing; 861 char addr[16]; 862 863 if (!recursing++) { 864 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); 865 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); 866 867 #ifndef NORADIUS 868 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, 869 fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask, 870 &ipcp->throughput); 871 872 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 873 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE, 874 NULL, NULL); 875 #endif 876 877 /* 878 * XXX this stuff should really live in the FSM. Our config should 879 * associate executable sections in files with events. 880 */ 881 if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) { 882 if (bundle_GetLabel(fp->bundle)) { 883 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 884 LINKDOWNFILE, NULL, NULL) < 0) 885 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 886 } else 887 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 888 } 889 890 ipcp_Setup(ipcp, INADDR_NONE); 891 } 892 recursing--; 893 } 894 895 int 896 ipcp_InterfaceUp(struct ipcp *ipcp) 897 { 898 if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) { 899 log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); 900 return 0; 901 } 902 903 if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) { 904 log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n", 905 ipcp->fsm.bundle->iface->name); 906 return 0; 907 } 908 909 #ifndef NONAT 910 if (ipcp->fsm.bundle->NatEnabled) 911 PacketAliasSetAddress(ipcp->my_ip); 912 #endif 913 914 return 1; 915 } 916 917 static int 918 IpcpLayerUp(struct fsm *fp) 919 { 920 /* We're now up */ 921 struct ipcp *ipcp = fsm2ipcp(fp); 922 char tbuff[16]; 923 924 log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); 925 snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); 926 log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", 927 tbuff, inet_ntoa(ipcp->peer_ip)); 928 929 if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) 930 sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); 931 932 if (!ipcp_InterfaceUp(ipcp)) 933 return 0; 934 935 #ifndef NORADIUS 936 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links, 937 RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput); 938 939 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 940 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE, 941 NULL, NULL); 942 #endif 943 944 /* 945 * XXX this stuff should really live in the FSM. Our config should 946 * associate executable sections in files with events. 947 */ 948 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { 949 if (bundle_GetLabel(fp->bundle)) { 950 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 951 LINKUPFILE, NULL, NULL) < 0) 952 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 953 } else 954 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 955 } 956 957 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 958 log_DisplayPrompts(); 959 960 return 1; 961 } 962 963 static void 964 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) 965 { 966 struct bundle *bundle = ipcp->fsm.bundle; 967 struct iface *iface = bundle->iface; 968 struct in_addr myaddr, peer; 969 unsigned n; 970 971 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 972 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 973 if (ip.s_addr == INADDR_ANY || 974 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || 975 !ipcp_SetIPaddress(ipcp, myaddr, ip)) { 976 log_Printf(LogIPCP, "%s: Address invalid or already in use\n", 977 inet_ntoa(ip)); 978 /* 979 * If we've already had a valid address configured for the peer, 980 * try NAKing with that so that we don't have to upset things 981 * too much. 982 */ 983 for (n = 0; n < iface->addrs; n++) { 984 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 985 continue; 986 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { 987 ipcp->peer_ip = peer; 988 break; 989 } 990 } 991 992 if (n == iface->addrs) { 993 /* Just pick an IP number from our list */ 994 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); 995 } 996 997 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 998 *dec->rejend++ = TY_IPADDR; 999 *dec->rejend++ = 6; 1000 memcpy(dec->rejend, &ip.s_addr, 4); 1001 dec->rejend += 4; 1002 } else { 1003 *dec->nakend++ = TY_IPADDR; 1004 *dec->nakend++ = 6; 1005 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1006 dec->nakend += 4; 1007 } 1008 return; 1009 } 1010 } else if (ip.s_addr == INADDR_ANY || 1011 !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { 1012 /* 1013 * If the destination address is not acceptable, NAK with what we 1014 * want to use. 1015 */ 1016 *dec->nakend++ = TY_IPADDR; 1017 *dec->nakend++ = 6; 1018 for (n = 0; n < iface->addrs; n++) 1019 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { 1020 /* We prefer the already-configured address */ 1021 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); 1022 break; 1023 } 1024 1025 if (n == iface->addrs) 1026 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1027 1028 dec->nakend += 4; 1029 return; 1030 } 1031 1032 ipcp->peer_ip = ip; 1033 *dec->ackend++ = TY_IPADDR; 1034 *dec->ackend++ = 6; 1035 memcpy(dec->ackend, &ip.s_addr, 4); 1036 dec->ackend += 4; 1037 } 1038 1039 static void 1040 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 1041 struct fsm_decode *dec) 1042 { 1043 /* Deal with incoming PROTO_IPCP */ 1044 struct ncpaddr ncpaddr; 1045 struct ipcp *ipcp = fsm2ipcp(fp); 1046 int gotdnsnak; 1047 u_int32_t compproto; 1048 struct compreq *pcomp; 1049 struct in_addr ipaddr, dstipaddr, have_ip; 1050 char tbuff[100], tbuff2[100]; 1051 struct fsm_opt *opt, nak; 1052 1053 gotdnsnak = 0; 1054 1055 while (end - cp >= (int)sizeof(opt->hdr)) { 1056 if ((opt = fsm_readopt(&cp)) == NULL) 1057 break; 1058 1059 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), 1060 opt->hdr.len); 1061 1062 switch (opt->hdr.id) { 1063 case TY_IPADDR: /* RFC1332 */ 1064 memcpy(&ipaddr.s_addr, opt->data, 4); 1065 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1066 1067 switch (mode_type) { 1068 case MODE_REQ: 1069 ipcp->peer_req = 1; 1070 ipcp_ValidateReq(ipcp, ipaddr, dec); 1071 break; 1072 1073 case MODE_NAK: 1074 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { 1075 /* Use address suggested by peer */ 1076 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, 1077 inet_ntoa(ipcp->my_ip)); 1078 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); 1079 ipcp->my_ip = ipaddr; 1080 ncpaddr_setip4(&ncpaddr, ipcp->my_ip); 1081 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); 1082 } else { 1083 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, 1084 "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); 1085 fsm_Close(&ipcp->fsm); 1086 } 1087 break; 1088 1089 case MODE_REJ: 1090 ipcp->peer_reject |= (1 << opt->hdr.id); 1091 break; 1092 } 1093 break; 1094 1095 case TY_COMPPROTO: 1096 pcomp = (struct compreq *)opt->data; 1097 compproto = (ntohs(pcomp->proto) << 16) + ((int)pcomp->slots << 8) + 1098 pcomp->compcid; 1099 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); 1100 1101 switch (mode_type) { 1102 case MODE_REQ: 1103 if (!IsAccepted(ipcp->cfg.vj.neg)) 1104 fsm_rej(dec, opt); 1105 else { 1106 switch (opt->hdr.len) { 1107 case 4: /* RFC1172 */ 1108 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1109 log_Printf(LogWARN, "Peer is speaking RFC1172 compression " 1110 "protocol !\n"); 1111 ipcp->heis1172 = 1; 1112 ipcp->peer_compproto = compproto; 1113 fsm_ack(dec, opt); 1114 } else { 1115 pcomp->proto = htons(PROTO_VJCOMP); 1116 nak.hdr.id = TY_COMPPROTO; 1117 nak.hdr.len = 4; 1118 memcpy(nak.data, &pcomp, 2); 1119 fsm_nak(dec, &nak); 1120 } 1121 break; 1122 case 6: /* RFC1332 */ 1123 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1124 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1125 if (pcomp->slots >= MIN_VJ_STATES) { 1126 /* Ok, we can do that */ 1127 ipcp->peer_compproto = compproto; 1128 ipcp->heis1172 = 0; 1129 fsm_ack(dec, opt); 1130 } else { 1131 /* Get as close as we can to what he wants */ 1132 ipcp->heis1172 = 0; 1133 pcomp->slots = MIN_VJ_STATES; 1134 nak.hdr.id = TY_COMPPROTO; 1135 nak.hdr.len = 4; 1136 memcpy(nak.data, &pcomp, 2); 1137 fsm_nak(dec, &nak); 1138 } 1139 } else { 1140 /* What we really want */ 1141 pcomp->proto = htons(PROTO_VJCOMP); 1142 pcomp->slots = DEF_VJ_STATES; 1143 pcomp->compcid = 1; 1144 nak.hdr.id = TY_COMPPROTO; 1145 nak.hdr.len = 6; 1146 memcpy(nak.data, &pcomp, sizeof pcomp); 1147 fsm_nak(dec, &nak); 1148 } 1149 break; 1150 default: 1151 fsm_rej(dec, opt); 1152 break; 1153 } 1154 } 1155 break; 1156 1157 case MODE_NAK: 1158 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1159 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1160 if (pcomp->slots < MIN_VJ_STATES) 1161 pcomp->slots = MIN_VJ_STATES; 1162 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + 1163 pcomp->compcid; 1164 } else 1165 compproto = 0; 1166 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", 1167 tbuff, ipcp->my_compproto, compproto); 1168 ipcp->my_compproto = compproto; 1169 break; 1170 1171 case MODE_REJ: 1172 ipcp->peer_reject |= (1 << opt->hdr.id); 1173 break; 1174 } 1175 break; 1176 1177 case TY_IPADDRS: /* RFC1172 */ 1178 memcpy(&ipaddr.s_addr, opt->data, 4); 1179 memcpy(&dstipaddr.s_addr, opt->data + 4, 4); 1180 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); 1181 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); 1182 1183 switch (mode_type) { 1184 case MODE_REQ: 1185 fsm_rej(dec, opt); 1186 break; 1187 1188 case MODE_NAK: 1189 case MODE_REJ: 1190 break; 1191 } 1192 break; 1193 1194 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ 1195 case TY_SECONDARY_DNS: 1196 memcpy(&ipaddr.s_addr, opt->data, 4); 1197 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1198 1199 switch (mode_type) { 1200 case MODE_REQ: 1201 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { 1202 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1203 fsm_rej(dec, opt); 1204 break; 1205 } 1206 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; 1207 1208 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && 1209 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { 1210 /* Swap 'em 'round */ 1211 ipcp->ns.dns[0] = ipcp->ns.dns[1]; 1212 ipcp->ns.dns[1] = have_ip; 1213 have_ip = ipcp->ns.dns[0]; 1214 } 1215 1216 if (ipaddr.s_addr != have_ip.s_addr) { 1217 /* 1218 * The client has got the DNS stuff wrong (first request) so 1219 * we'll tell 'em how it is 1220 */ 1221 nak.hdr.id = opt->hdr.id; 1222 nak.hdr.len = 6; 1223 memcpy(nak.data, &have_ip.s_addr, 4); 1224 fsm_nak(dec, &nak); 1225 } else { 1226 /* 1227 * Otherwise they have it right (this time) so we send a ack packet 1228 * back confirming it... end of story 1229 */ 1230 fsm_ack(dec, opt); 1231 } 1232 break; 1233 1234 case MODE_NAK: 1235 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 1236 gotdnsnak = 1; 1237 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, 1238 opt->data, 4); 1239 } 1240 break; 1241 1242 case MODE_REJ: /* Can't do much, stop asking */ 1243 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1244 break; 1245 } 1246 break; 1247 1248 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ 1249 case TY_SECONDARY_NBNS: 1250 memcpy(&ipaddr.s_addr, opt->data, 4); 1251 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1252 1253 switch (mode_type) { 1254 case MODE_REQ: 1255 have_ip.s_addr = 1256 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; 1257 1258 if (have_ip.s_addr == INADDR_ANY) { 1259 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); 1260 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1261 fsm_rej(dec, opt); 1262 break; 1263 } 1264 1265 if (ipaddr.s_addr != have_ip.s_addr) { 1266 nak.hdr.id = opt->hdr.id; 1267 nak.hdr.len = 6; 1268 memcpy(nak.data, &have_ip.s_addr, 4); 1269 fsm_nak(dec, &nak); 1270 } else 1271 fsm_ack(dec, opt); 1272 break; 1273 1274 case MODE_NAK: 1275 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); 1276 break; 1277 1278 case MODE_REJ: 1279 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); 1280 break; 1281 } 1282 break; 1283 1284 default: 1285 if (mode_type != MODE_NOP) { 1286 ipcp->my_reject |= (1 << opt->hdr.id); 1287 fsm_rej(dec, opt); 1288 } 1289 break; 1290 } 1291 } 1292 1293 if (gotdnsnak) { 1294 if (ipcp->ns.writable) { 1295 log_Printf(LogDEBUG, "Updating resolver\n"); 1296 if (!ipcp_WriteDNS(ipcp)) { 1297 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); 1298 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); 1299 } else 1300 bundle_AdjustDNS(fp->bundle); 1301 } else { 1302 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); 1303 bundle_AdjustDNS(fp->bundle); 1304 } 1305 } 1306 1307 if (mode_type != MODE_NOP) { 1308 if (mode_type == MODE_REQ && !ipcp->peer_req) { 1309 if (dec->rejend == dec->rej && dec->nakend == dec->nak) { 1310 /* 1311 * Pretend the peer has requested an IP. 1312 * We do this to ensure that we only send one NAK if the only 1313 * reason for the NAK is because the peer isn't sending a 1314 * TY_IPADDR REQ. This stops us from repeatedly trying to tell 1315 * the peer that we have to have an IP address on their end. 1316 */ 1317 ipcp->peer_req = 1; 1318 } 1319 ipaddr.s_addr = INADDR_ANY; 1320 ipcp_ValidateReq(ipcp, ipaddr, dec); 1321 } 1322 fsm_opt_normalise(dec); 1323 } 1324 } 1325 1326 extern struct mbuf * 1327 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1328 { 1329 /* Got PROTO_IPCP from link */ 1330 m_settype(bp, MB_IPCPIN); 1331 if (bundle_Phase(bundle) == PHASE_NETWORK) 1332 fsm_Input(&bundle->ncp.ipcp.fsm, bp); 1333 else { 1334 if (bundle_Phase(bundle) < PHASE_NETWORK) 1335 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", 1336 l->name, bundle_PhaseName(bundle)); 1337 m_freem(bp); 1338 } 1339 return NULL; 1340 } 1341 1342 int 1343 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) 1344 { 1345 struct ipcp *ipcp = &bundle->ncp.ipcp; 1346 struct in_addr myaddr; 1347 1348 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1349 iplist_reset(&ipcp->cfg.peer_list); 1350 ipcp->peer_ip = hisaddr; 1351 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); 1352 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1353 1354 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); 1355 } 1356 1357 int 1358 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) 1359 { 1360 struct in_addr myaddr; 1361 struct ncp *ncp = &bundle->ncp; 1362 struct ipcp *ipcp = &ncp->ipcp; 1363 struct ncpaddr ncpaddr; 1364 1365 /* Use `hisaddr' for the peers address (set iface if `setaddr') */ 1366 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1367 iplist_reset(&ipcp->cfg.peer_list); 1368 if (strpbrk(hisaddr, ",-")) { 1369 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); 1370 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 1371 iplist_setrandpos(&ipcp->cfg.peer_list); 1372 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); 1373 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1374 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); 1375 return 0; 1376 } 1377 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); 1378 } else { 1379 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); 1380 return 0; 1381 } 1382 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { 1383 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { 1384 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); 1385 return 0; 1386 } 1387 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1388 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 1389 1390 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) 1391 return 0; 1392 } else 1393 return 0; 1394 1395 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); 1396 bundle_AdjustFilters(bundle, NULL, &ncpaddr); 1397 1398 return 1; /* Ok */ 1399 } 1400 1401 struct in_addr 1402 addr2mask(struct in_addr addr) 1403 { 1404 u_int32_t haddr = ntohl(addr.s_addr); 1405 1406 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : 1407 IN_CLASSB(haddr) ? IN_CLASSB_NET : 1408 IN_CLASSC_NET; 1409 addr.s_addr = htonl(haddr); 1410 1411 return addr; 1412 } 1413 1414 size_t 1415 ipcp_QueueLen(struct ipcp *ipcp) 1416 { 1417 struct mqueue *q; 1418 size_t result; 1419 1420 result = 0; 1421 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) 1422 result += q->len; 1423 1424 return result; 1425 } 1426 1427 int 1428 ipcp_PushPacket(struct ipcp *ipcp, struct link *l) 1429 { 1430 struct bundle *bundle = ipcp->fsm.bundle; 1431 struct mqueue *queue; 1432 struct mbuf *bp; 1433 int m_len; 1434 u_int32_t secs = 0; 1435 unsigned alivesecs = 0; 1436 1437 if (ipcp->fsm.state != ST_OPENED) 1438 return 0; 1439 1440 /* 1441 * If ccp is not open but is required, do nothing. 1442 */ 1443 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 1444 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 1445 return 0; 1446 } 1447 1448 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; 1449 do { 1450 if (queue->top) { 1451 bp = m_dequeue(queue); 1452 bp = mbuf_Read(bp, &secs, sizeof secs); 1453 bp = m_pullup(bp); 1454 m_len = m_length(bp); 1455 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, 1456 &alivesecs)) { 1457 if (secs == 0) 1458 secs = alivesecs; 1459 bundle_StartIdleTimer(bundle, secs); 1460 } 1461 link_PushPacket(l, bp, bundle, 0, PROTO_IP); 1462 ipcp_AddOutOctets(ipcp, m_len); 1463 return 1; 1464 } 1465 } while (queue-- != ipcp->Queue); 1466 1467 return 0; 1468 } 1469