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 mask.s_addr = 0; /* avoid gcc warnings */ 617 618 if (!ncpaddr_getip4(&addr->peer, &peer)) { 619 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); 620 return 0; 621 } 622 623 ret = 0; 624 625 if (Enabled(bundle, OPT_PROXYALL)) { 626 ncprange_getip4mask(&addr->ifa, &mask); 627 if ((n = numaddresses(mask)) > 256) { 628 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", 629 ncprange_ntoa(&addr->ifa)); 630 return 0; 631 } 632 ip.s_addr = peer.s_addr & mask.s_addr; 633 if (n >= 4) { 634 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 635 n -= 2; 636 } 637 while (n) { 638 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { 639 if (!(ret = (*proxyfun)(bundle, ip))) 640 break; 641 n--; 642 } 643 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 644 } 645 ret = !n; 646 } else if (Enabled(bundle, OPT_PROXY)) 647 ret = (*proxyfun)(bundle, peer); 648 649 return ret; 650 } 651 652 static int 653 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, 654 struct in_addr hisaddr) 655 { 656 struct bundle *bundle = ipcp->fsm.bundle; 657 struct ncpaddr myncpaddr, hisncpaddr; 658 struct ncprange myrange; 659 struct in_addr mask; 660 struct sockaddr_storage ssdst, ssgw, ssmask; 661 struct sockaddr *sadst, *sagw, *samask; 662 663 sadst = (struct sockaddr *)&ssdst; 664 sagw = (struct sockaddr *)&ssgw; 665 samask = (struct sockaddr *)&ssmask; 666 667 ncpaddr_setip4(&hisncpaddr, hisaddr); 668 ncpaddr_setip4(&myncpaddr, myaddr); 669 ncprange_sethost(&myrange, &myncpaddr); 670 671 mask = addr2mask(myaddr); 672 673 if (ipcp->ifmask.s_addr != INADDR_ANY && 674 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) 675 ncprange_setip4mask(&myrange, ipcp->ifmask); 676 677 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, 678 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) 679 return 0; 680 681 if (!Enabled(bundle, OPT_IFACEALIAS)) 682 iface_Clear(bundle->iface, &bundle->ncp, AF_INET, 683 IFACE_CLEAR_ALIASES|IFACE_SYSTEM); 684 685 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { 686 ncprange_getsa(&myrange, &ssgw, &ssmask); 687 ncpaddr_getsa(&hisncpaddr, &ssdst); 688 rt_Update(bundle, sadst, sagw, samask); 689 } 690 691 if (Enabled(bundle, OPT_SROUTES)) 692 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); 693 694 #ifndef NORADIUS 695 if (bundle->radius.valid) 696 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); 697 #endif 698 699 return 1; /* Ok */ 700 } 701 702 static struct in_addr 703 ChooseHisAddr(struct bundle *bundle, struct in_addr gw) 704 { 705 struct in_addr try; 706 u_long f; 707 708 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { 709 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); 710 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", 711 f, inet_ntoa(try)); 712 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { 713 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); 714 break; 715 } 716 } 717 718 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { 719 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 720 try.s_addr = INADDR_ANY; 721 } 722 723 return try; 724 } 725 726 static void 727 IpcpInitRestartCounter(struct fsm *fp, int what) 728 { 729 /* Set fsm timer load */ 730 struct ipcp *ipcp = fsm2ipcp(fp); 731 732 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; 733 switch (what) { 734 case FSM_REQ_TIMER: 735 fp->restart = ipcp->cfg.fsm.maxreq; 736 break; 737 case FSM_TRM_TIMER: 738 fp->restart = ipcp->cfg.fsm.maxtrm; 739 break; 740 default: 741 fp->restart = 1; 742 break; 743 } 744 } 745 746 static void 747 IpcpSendConfigReq(struct fsm *fp) 748 { 749 /* Send config REQ please */ 750 struct physical *p = link2physical(fp->link); 751 struct ipcp *ipcp = fsm2ipcp(fp); 752 u_char buff[24]; 753 struct fsm_opt *o; 754 755 o = (struct fsm_opt *)buff; 756 757 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { 758 memcpy(o->data, &ipcp->my_ip.s_addr, 4); 759 INC_FSM_OPT(TY_IPADDR, 6, o); 760 } 761 762 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { 763 if (ipcp->heis1172) { 764 u_int16_t proto = PROTO_VJCOMP; 765 766 ua_htons(&proto, o->data); 767 INC_FSM_OPT(TY_COMPPROTO, 4, o); 768 } else { 769 struct compreq req; 770 771 req.proto = htons(ipcp->my_compproto >> 16); 772 req.slots = (ipcp->my_compproto >> 8) & 255; 773 req.compcid = ipcp->my_compproto & 1; 774 memcpy(o->data, &req, 4); 775 INC_FSM_OPT(TY_COMPPROTO, 6, o); 776 } 777 } 778 779 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 780 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { 781 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); 782 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); 783 } 784 785 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { 786 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); 787 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); 788 } 789 } 790 791 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 792 MB_IPCPOUT); 793 } 794 795 static void 796 IpcpSentTerminateReq(struct fsm *fp __unused) 797 { 798 /* Term REQ just sent by FSM */ 799 } 800 801 static void 802 IpcpSendTerminateAck(struct fsm *fp, u_char id) 803 { 804 /* Send Term ACK please */ 805 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); 806 } 807 808 static void 809 IpcpLayerStart(struct fsm *fp) 810 { 811 /* We're about to start up ! */ 812 struct ipcp *ipcp = fsm2ipcp(fp); 813 814 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); 815 throughput_start(&ipcp->throughput, "IPCP throughput", 816 Enabled(fp->bundle, OPT_THROUGHPUT)); 817 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 818 ipcp->peer_req = 0; 819 } 820 821 static void 822 IpcpLayerFinish(struct fsm *fp) 823 { 824 /* We're now down */ 825 struct ipcp *ipcp = fsm2ipcp(fp); 826 827 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); 828 throughput_stop(&ipcp->throughput); 829 throughput_log(&ipcp->throughput, LogIPCP, NULL); 830 } 831 832 /* 833 * Called from iface_Add() via ncp_IfaceAddrAdded() 834 */ 835 void 836 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr) 837 { 838 struct bundle *bundle = ipcp->fsm.bundle; 839 840 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 841 ipcp_proxyarp(ipcp, arp_SetProxy, addr); 842 } 843 844 /* 845 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() 846 */ 847 void 848 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) 849 { 850 struct bundle *bundle = ipcp->fsm.bundle; 851 852 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 853 ipcp_proxyarp(ipcp, arp_ClearProxy, addr); 854 } 855 856 static void 857 IpcpLayerDown(struct fsm *fp) 858 { 859 /* About to come down */ 860 struct ipcp *ipcp = fsm2ipcp(fp); 861 static int recursing; 862 char addr[16]; 863 864 if (!recursing++) { 865 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); 866 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); 867 868 #ifndef NORADIUS 869 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, 870 fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask, 871 &ipcp->throughput); 872 873 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 874 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE, 875 NULL, NULL); 876 #endif 877 878 /* 879 * XXX this stuff should really live in the FSM. Our config should 880 * associate executable sections in files with events. 881 */ 882 if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) { 883 if (bundle_GetLabel(fp->bundle)) { 884 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 885 LINKDOWNFILE, NULL, NULL) < 0) 886 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 887 } else 888 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 889 } 890 891 ipcp_Setup(ipcp, INADDR_NONE); 892 } 893 recursing--; 894 } 895 896 int 897 ipcp_InterfaceUp(struct ipcp *ipcp) 898 { 899 if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) { 900 log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); 901 return 0; 902 } 903 904 if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) { 905 log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n", 906 ipcp->fsm.bundle->iface->name); 907 return 0; 908 } 909 910 #ifndef NONAT 911 if (ipcp->fsm.bundle->NatEnabled) 912 PacketAliasSetAddress(ipcp->my_ip); 913 #endif 914 915 return 1; 916 } 917 918 static int 919 IpcpLayerUp(struct fsm *fp) 920 { 921 /* We're now up */ 922 struct ipcp *ipcp = fsm2ipcp(fp); 923 char tbuff[16]; 924 925 log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); 926 snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); 927 log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", 928 tbuff, inet_ntoa(ipcp->peer_ip)); 929 930 if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) 931 sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); 932 933 if (!ipcp_InterfaceUp(ipcp)) 934 return 0; 935 936 #ifndef NORADIUS 937 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links, 938 RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput); 939 940 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 941 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE, 942 NULL, NULL); 943 #endif 944 945 /* 946 * XXX this stuff should really live in the FSM. Our config should 947 * associate executable sections in files with events. 948 */ 949 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { 950 if (bundle_GetLabel(fp->bundle)) { 951 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 952 LINKUPFILE, NULL, NULL) < 0) 953 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 954 } else 955 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 956 } 957 958 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 959 log_DisplayPrompts(); 960 961 return 1; 962 } 963 964 static void 965 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) 966 { 967 struct bundle *bundle = ipcp->fsm.bundle; 968 struct iface *iface = bundle->iface; 969 struct in_addr myaddr, peer; 970 unsigned n; 971 972 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 973 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 974 if (ip.s_addr == INADDR_ANY || 975 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || 976 !ipcp_SetIPaddress(ipcp, myaddr, ip)) { 977 log_Printf(LogIPCP, "%s: Address invalid or already in use\n", 978 inet_ntoa(ip)); 979 /* 980 * If we've already had a valid address configured for the peer, 981 * try NAKing with that so that we don't have to upset things 982 * too much. 983 */ 984 for (n = 0; n < iface->addrs; n++) { 985 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 986 continue; 987 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { 988 ipcp->peer_ip = peer; 989 break; 990 } 991 } 992 993 if (n == iface->addrs) { 994 /* Just pick an IP number from our list */ 995 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); 996 } 997 998 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 999 *dec->rejend++ = TY_IPADDR; 1000 *dec->rejend++ = 6; 1001 memcpy(dec->rejend, &ip.s_addr, 4); 1002 dec->rejend += 4; 1003 } else { 1004 *dec->nakend++ = TY_IPADDR; 1005 *dec->nakend++ = 6; 1006 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1007 dec->nakend += 4; 1008 } 1009 return; 1010 } 1011 } else if (ip.s_addr == INADDR_ANY || 1012 !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { 1013 /* 1014 * If the destination address is not acceptable, NAK with what we 1015 * want to use. 1016 */ 1017 *dec->nakend++ = TY_IPADDR; 1018 *dec->nakend++ = 6; 1019 for (n = 0; n < iface->addrs; n++) 1020 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { 1021 /* We prefer the already-configured address */ 1022 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); 1023 break; 1024 } 1025 1026 if (n == iface->addrs) 1027 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1028 1029 dec->nakend += 4; 1030 return; 1031 } 1032 1033 ipcp->peer_ip = ip; 1034 *dec->ackend++ = TY_IPADDR; 1035 *dec->ackend++ = 6; 1036 memcpy(dec->ackend, &ip.s_addr, 4); 1037 dec->ackend += 4; 1038 } 1039 1040 static void 1041 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 1042 struct fsm_decode *dec) 1043 { 1044 /* Deal with incoming PROTO_IPCP */ 1045 struct ncpaddr ncpaddr; 1046 struct ipcp *ipcp = fsm2ipcp(fp); 1047 int gotdnsnak; 1048 u_int32_t compproto; 1049 struct compreq *pcomp; 1050 struct in_addr ipaddr, dstipaddr, have_ip; 1051 char tbuff[100], tbuff2[100]; 1052 struct fsm_opt *opt, nak; 1053 1054 gotdnsnak = 0; 1055 1056 while (end - cp >= (int)sizeof(opt->hdr)) { 1057 if ((opt = fsm_readopt(&cp)) == NULL) 1058 break; 1059 1060 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), 1061 opt->hdr.len); 1062 1063 switch (opt->hdr.id) { 1064 case TY_IPADDR: /* RFC1332 */ 1065 memcpy(&ipaddr.s_addr, opt->data, 4); 1066 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1067 1068 switch (mode_type) { 1069 case MODE_REQ: 1070 ipcp->peer_req = 1; 1071 ipcp_ValidateReq(ipcp, ipaddr, dec); 1072 break; 1073 1074 case MODE_NAK: 1075 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { 1076 /* Use address suggested by peer */ 1077 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, 1078 inet_ntoa(ipcp->my_ip)); 1079 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); 1080 ipcp->my_ip = ipaddr; 1081 ncpaddr_setip4(&ncpaddr, ipcp->my_ip); 1082 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); 1083 } else { 1084 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, 1085 "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); 1086 fsm_Close(&ipcp->fsm); 1087 } 1088 break; 1089 1090 case MODE_REJ: 1091 ipcp->peer_reject |= (1 << opt->hdr.id); 1092 break; 1093 } 1094 break; 1095 1096 case TY_COMPPROTO: 1097 pcomp = (struct compreq *)opt->data; 1098 compproto = (ntohs(pcomp->proto) << 16) + ((int)pcomp->slots << 8) + 1099 pcomp->compcid; 1100 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); 1101 1102 switch (mode_type) { 1103 case MODE_REQ: 1104 if (!IsAccepted(ipcp->cfg.vj.neg)) 1105 fsm_rej(dec, opt); 1106 else { 1107 switch (opt->hdr.len) { 1108 case 4: /* RFC1172 */ 1109 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1110 log_Printf(LogWARN, "Peer is speaking RFC1172 compression " 1111 "protocol !\n"); 1112 ipcp->heis1172 = 1; 1113 ipcp->peer_compproto = compproto; 1114 fsm_ack(dec, opt); 1115 } else { 1116 pcomp->proto = htons(PROTO_VJCOMP); 1117 nak.hdr.id = TY_COMPPROTO; 1118 nak.hdr.len = 4; 1119 memcpy(nak.data, &pcomp, 2); 1120 fsm_nak(dec, &nak); 1121 } 1122 break; 1123 case 6: /* RFC1332 */ 1124 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1125 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1126 if (pcomp->slots >= MIN_VJ_STATES) { 1127 /* Ok, we can do that */ 1128 ipcp->peer_compproto = compproto; 1129 ipcp->heis1172 = 0; 1130 fsm_ack(dec, opt); 1131 } else { 1132 /* Get as close as we can to what he wants */ 1133 ipcp->heis1172 = 0; 1134 pcomp->slots = MIN_VJ_STATES; 1135 nak.hdr.id = TY_COMPPROTO; 1136 nak.hdr.len = 4; 1137 memcpy(nak.data, &pcomp, 2); 1138 fsm_nak(dec, &nak); 1139 } 1140 } else { 1141 /* What we really want */ 1142 pcomp->proto = htons(PROTO_VJCOMP); 1143 pcomp->slots = DEF_VJ_STATES; 1144 pcomp->compcid = 1; 1145 nak.hdr.id = TY_COMPPROTO; 1146 nak.hdr.len = 6; 1147 memcpy(nak.data, &pcomp, sizeof pcomp); 1148 fsm_nak(dec, &nak); 1149 } 1150 break; 1151 default: 1152 fsm_rej(dec, opt); 1153 break; 1154 } 1155 } 1156 break; 1157 1158 case MODE_NAK: 1159 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1160 /* We know pcomp->slots' max value == MAX_VJ_STATES */ 1161 if (pcomp->slots < MIN_VJ_STATES) 1162 pcomp->slots = MIN_VJ_STATES; 1163 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + 1164 pcomp->compcid; 1165 } else 1166 compproto = 0; 1167 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", 1168 tbuff, ipcp->my_compproto, compproto); 1169 ipcp->my_compproto = compproto; 1170 break; 1171 1172 case MODE_REJ: 1173 ipcp->peer_reject |= (1 << opt->hdr.id); 1174 break; 1175 } 1176 break; 1177 1178 case TY_IPADDRS: /* RFC1172 */ 1179 memcpy(&ipaddr.s_addr, opt->data, 4); 1180 memcpy(&dstipaddr.s_addr, opt->data + 4, 4); 1181 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); 1182 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); 1183 1184 switch (mode_type) { 1185 case MODE_REQ: 1186 fsm_rej(dec, opt); 1187 break; 1188 1189 case MODE_NAK: 1190 case MODE_REJ: 1191 break; 1192 } 1193 break; 1194 1195 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ 1196 case TY_SECONDARY_DNS: 1197 memcpy(&ipaddr.s_addr, opt->data, 4); 1198 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1199 1200 switch (mode_type) { 1201 case MODE_REQ: 1202 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { 1203 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1204 fsm_rej(dec, opt); 1205 break; 1206 } 1207 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; 1208 1209 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && 1210 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { 1211 /* Swap 'em 'round */ 1212 ipcp->ns.dns[0] = ipcp->ns.dns[1]; 1213 ipcp->ns.dns[1] = have_ip; 1214 have_ip = ipcp->ns.dns[0]; 1215 } 1216 1217 if (ipaddr.s_addr != have_ip.s_addr) { 1218 /* 1219 * The client has got the DNS stuff wrong (first request) so 1220 * we'll tell 'em how it is 1221 */ 1222 nak.hdr.id = opt->hdr.id; 1223 nak.hdr.len = 6; 1224 memcpy(nak.data, &have_ip.s_addr, 4); 1225 fsm_nak(dec, &nak); 1226 } else { 1227 /* 1228 * Otherwise they have it right (this time) so we send a ack packet 1229 * back confirming it... end of story 1230 */ 1231 fsm_ack(dec, opt); 1232 } 1233 break; 1234 1235 case MODE_NAK: 1236 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 1237 gotdnsnak = 1; 1238 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, 1239 opt->data, 4); 1240 } 1241 break; 1242 1243 case MODE_REJ: /* Can't do much, stop asking */ 1244 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1245 break; 1246 } 1247 break; 1248 1249 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ 1250 case TY_SECONDARY_NBNS: 1251 memcpy(&ipaddr.s_addr, opt->data, 4); 1252 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1253 1254 switch (mode_type) { 1255 case MODE_REQ: 1256 have_ip.s_addr = 1257 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; 1258 1259 if (have_ip.s_addr == INADDR_ANY) { 1260 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); 1261 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1262 fsm_rej(dec, opt); 1263 break; 1264 } 1265 1266 if (ipaddr.s_addr != have_ip.s_addr) { 1267 nak.hdr.id = opt->hdr.id; 1268 nak.hdr.len = 6; 1269 memcpy(nak.data, &have_ip.s_addr, 4); 1270 fsm_nak(dec, &nak); 1271 } else 1272 fsm_ack(dec, opt); 1273 break; 1274 1275 case MODE_NAK: 1276 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); 1277 break; 1278 1279 case MODE_REJ: 1280 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); 1281 break; 1282 } 1283 break; 1284 1285 default: 1286 if (mode_type != MODE_NOP) { 1287 ipcp->my_reject |= (1 << opt->hdr.id); 1288 fsm_rej(dec, opt); 1289 } 1290 break; 1291 } 1292 } 1293 1294 if (gotdnsnak) { 1295 if (ipcp->ns.writable) { 1296 log_Printf(LogDEBUG, "Updating resolver\n"); 1297 if (!ipcp_WriteDNS(ipcp)) { 1298 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); 1299 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); 1300 } else 1301 bundle_AdjustDNS(fp->bundle); 1302 } else { 1303 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); 1304 bundle_AdjustDNS(fp->bundle); 1305 } 1306 } 1307 1308 if (mode_type != MODE_NOP) { 1309 if (mode_type == MODE_REQ && !ipcp->peer_req) { 1310 if (dec->rejend == dec->rej && dec->nakend == dec->nak) { 1311 /* 1312 * Pretend the peer has requested an IP. 1313 * We do this to ensure that we only send one NAK if the only 1314 * reason for the NAK is because the peer isn't sending a 1315 * TY_IPADDR REQ. This stops us from repeatedly trying to tell 1316 * the peer that we have to have an IP address on their end. 1317 */ 1318 ipcp->peer_req = 1; 1319 } 1320 ipaddr.s_addr = INADDR_ANY; 1321 ipcp_ValidateReq(ipcp, ipaddr, dec); 1322 } 1323 fsm_opt_normalise(dec); 1324 } 1325 } 1326 1327 extern struct mbuf * 1328 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1329 { 1330 /* Got PROTO_IPCP from link */ 1331 m_settype(bp, MB_IPCPIN); 1332 if (bundle_Phase(bundle) == PHASE_NETWORK) 1333 fsm_Input(&bundle->ncp.ipcp.fsm, bp); 1334 else { 1335 if (bundle_Phase(bundle) < PHASE_NETWORK) 1336 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", 1337 l->name, bundle_PhaseName(bundle)); 1338 m_freem(bp); 1339 } 1340 return NULL; 1341 } 1342 1343 int 1344 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) 1345 { 1346 struct ipcp *ipcp = &bundle->ncp.ipcp; 1347 struct in_addr myaddr; 1348 1349 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1350 iplist_reset(&ipcp->cfg.peer_list); 1351 ipcp->peer_ip = hisaddr; 1352 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); 1353 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1354 1355 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); 1356 } 1357 1358 int 1359 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) 1360 { 1361 struct in_addr myaddr; 1362 struct ncp *ncp = &bundle->ncp; 1363 struct ipcp *ipcp = &ncp->ipcp; 1364 struct ncpaddr ncpaddr; 1365 1366 /* Use `hisaddr' for the peers address (set iface if `setaddr') */ 1367 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1368 iplist_reset(&ipcp->cfg.peer_list); 1369 if (strpbrk(hisaddr, ",-")) { 1370 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); 1371 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 1372 iplist_setrandpos(&ipcp->cfg.peer_list); 1373 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); 1374 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1375 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); 1376 return 0; 1377 } 1378 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); 1379 } else { 1380 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); 1381 return 0; 1382 } 1383 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { 1384 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { 1385 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); 1386 return 0; 1387 } 1388 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1389 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 1390 1391 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) 1392 return 0; 1393 } else 1394 return 0; 1395 1396 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); 1397 bundle_AdjustFilters(bundle, NULL, &ncpaddr); 1398 1399 return 1; /* Ok */ 1400 } 1401 1402 struct in_addr 1403 addr2mask(struct in_addr addr) 1404 { 1405 u_int32_t haddr = ntohl(addr.s_addr); 1406 1407 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : 1408 IN_CLASSB(haddr) ? IN_CLASSB_NET : 1409 IN_CLASSC_NET; 1410 addr.s_addr = htonl(haddr); 1411 1412 return addr; 1413 } 1414 1415 size_t 1416 ipcp_QueueLen(struct ipcp *ipcp) 1417 { 1418 struct mqueue *q; 1419 size_t result; 1420 1421 result = 0; 1422 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) 1423 result += q->len; 1424 1425 return result; 1426 } 1427 1428 int 1429 ipcp_PushPacket(struct ipcp *ipcp, struct link *l) 1430 { 1431 struct bundle *bundle = ipcp->fsm.bundle; 1432 struct mqueue *queue; 1433 struct mbuf *bp; 1434 int m_len; 1435 u_int32_t secs = 0; 1436 unsigned alivesecs = 0; 1437 1438 if (ipcp->fsm.state != ST_OPENED) 1439 return 0; 1440 1441 /* 1442 * If ccp is not open but is required, do nothing. 1443 */ 1444 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 1445 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 1446 return 0; 1447 } 1448 1449 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; 1450 do { 1451 if (queue->top) { 1452 bp = m_dequeue(queue); 1453 bp = mbuf_Read(bp, &secs, sizeof secs); 1454 bp = m_pullup(bp); 1455 m_len = m_length(bp); 1456 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, 1457 &alivesecs)) { 1458 if (secs == 0) 1459 secs = alivesecs; 1460 bundle_StartIdleTimer(bundle, secs); 1461 } 1462 link_PushPacket(l, bp, bundle, 0, PROTO_IP); 1463 ipcp_AddOutOctets(ipcp, m_len); 1464 return 1; 1465 } 1466 } while (queue-- != ipcp->Queue); 1467 1468 return 0; 1469 } 1470