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 * $FreeBSD$ 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 <stdlib.h> 46 #include <string.h> 47 #include <sys/stat.h> 48 #include <termios.h> 49 #include <unistd.h> 50 51 #ifndef NONAT 52 #ifdef LOCALNAT 53 #include "alias.h" 54 #else 55 #include <alias.h> 56 #endif 57 #endif 58 59 #include "layer.h" 60 #include "ua.h" 61 #include "defs.h" 62 #include "command.h" 63 #include "mbuf.h" 64 #include "log.h" 65 #include "timer.h" 66 #include "fsm.h" 67 #include "proto.h" 68 #include "iplist.h" 69 #include "throughput.h" 70 #include "slcompress.h" 71 #include "lqr.h" 72 #include "hdlc.h" 73 #include "lcp.h" 74 #include "ncpaddr.h" 75 #include "ip.h" 76 #include "ipcp.h" 77 #include "filter.h" 78 #include "descriptor.h" 79 #include "vjcomp.h" 80 #include "async.h" 81 #include "ccp.h" 82 #include "link.h" 83 #include "physical.h" 84 #include "mp.h" 85 #ifndef NORADIUS 86 #include "radius.h" 87 #endif 88 #include "ipv6cp.h" 89 #include "ncp.h" 90 #include "bundle.h" 91 #include "id.h" 92 #include "arp.h" 93 #include "systems.h" 94 #include "prompt.h" 95 #include "route.h" 96 #include "iface.h" 97 98 #undef REJECTED 99 #define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) 100 #define issep(ch) ((ch) == ' ' || (ch) == '\t') 101 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') 102 103 struct compreq { 104 u_short proto; 105 u_char slots; 106 u_char compcid; 107 }; 108 109 static int IpcpLayerUp(struct fsm *); 110 static void IpcpLayerDown(struct fsm *); 111 static void IpcpLayerStart(struct fsm *); 112 static void IpcpLayerFinish(struct fsm *); 113 static void IpcpInitRestartCounter(struct fsm *, int); 114 static void IpcpSendConfigReq(struct fsm *); 115 static void IpcpSentTerminateReq(struct fsm *); 116 static void IpcpSendTerminateAck(struct fsm *, u_char); 117 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 118 struct fsm_decode *); 119 120 static struct fsm_callbacks ipcp_Callbacks = { 121 IpcpLayerUp, 122 IpcpLayerDown, 123 IpcpLayerStart, 124 IpcpLayerFinish, 125 IpcpInitRestartCounter, 126 IpcpSendConfigReq, 127 IpcpSentTerminateReq, 128 IpcpSendTerminateAck, 129 IpcpDecodeConfig, 130 fsm_NullRecvResetReq, 131 fsm_NullRecvResetAck 132 }; 133 134 static const char * 135 protoname(int proto) 136 { 137 static struct { 138 int id; 139 const char *txt; 140 } cftypes[] = { 141 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 142 { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */ 143 { 2, "COMPPROTO" }, /* IP-Compression-Protocol */ 144 { 3, "IPADDR" }, /* IP-Address */ 145 { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */ 146 { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */ 147 { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */ 148 { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */ 149 }; 150 int f; 151 152 for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++) 153 if (cftypes[f].id == proto) 154 return cftypes[f].txt; 155 156 return NumStr(proto, NULL, 0); 157 } 158 159 void 160 ipcp_AddInOctets(struct ipcp *ipcp, int n) 161 { 162 throughput_addin(&ipcp->throughput, n); 163 } 164 165 void 166 ipcp_AddOutOctets(struct ipcp *ipcp, int n) 167 { 168 throughput_addout(&ipcp->throughput, n); 169 } 170 171 void 172 ipcp_LoadDNS(struct ipcp *ipcp) 173 { 174 int fd; 175 176 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE; 177 178 if (ipcp->ns.resolv != NULL) { 179 free(ipcp->ns.resolv); 180 ipcp->ns.resolv = NULL; 181 } 182 if (ipcp->ns.resolv_nons != NULL) { 183 free(ipcp->ns.resolv_nons); 184 ipcp->ns.resolv_nons = NULL; 185 } 186 ipcp->ns.resolver = 0; 187 188 if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) { 189 struct stat st; 190 191 if (fstat(fd, &st) == 0) { 192 ssize_t got; 193 194 if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL) 195 log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n", 196 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 197 else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) { 198 log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n", 199 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 200 free(ipcp->ns.resolv_nons); 201 ipcp->ns.resolv_nons = NULL; 202 } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) { 203 if (got == -1) 204 log_Printf(LogERROR, "Failed to read %s: %s\n", 205 _PATH_RESCONF, strerror(errno)); 206 else 207 log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n", 208 _PATH_RESCONF, (unsigned long)got, 209 (unsigned long)st.st_size); 210 free(ipcp->ns.resolv_nons); 211 ipcp->ns.resolv_nons = NULL; 212 free(ipcp->ns.resolv); 213 ipcp->ns.resolv = NULL; 214 } else { 215 char *cp, *cp_nons, *ncp, ch; 216 int n; 217 218 ipcp->ns.resolv[st.st_size] = '\0'; 219 ipcp->ns.resolver = 1; 220 221 cp_nons = ipcp->ns.resolv_nons; 222 cp = ipcp->ns.resolv; 223 n = 0; 224 225 while ((ncp = strstr(cp, "nameserver")) != NULL) { 226 if (ncp != cp) { 227 memcpy(cp_nons, cp, ncp - cp); 228 cp_nons += ncp - cp; 229 } 230 if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) { 231 memcpy(cp_nons, ncp, 9); 232 cp_nons += 9; 233 cp = ncp + 9; /* Can't match "nameserver" at cp... */ 234 continue; 235 } 236 237 for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */ 238 ; 239 240 for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */ 241 ; 242 243 ch = *ncp; 244 *ncp = '\0'; 245 if (n < 2 && inet_aton(cp, ipcp->ns.dns)) 246 n++; 247 *ncp = ch; 248 249 if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */ 250 cp = ncp + strlen(ncp); 251 else 252 cp++; 253 } 254 strcpy(cp_nons, cp); /* Copy the end - including the NUL */ 255 cp_nons += strlen(cp_nons) - 1; 256 while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n') 257 *cp_nons-- = '\0'; 258 if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) { 259 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 260 ipcp->ns.dns[1].s_addr = INADDR_ANY; 261 } 262 bundle_AdjustDNS(ipcp->fsm.bundle); 263 } 264 } else 265 log_Printf(LogERROR, "Failed to stat opened %s: %s\n", 266 _PATH_RESCONF, strerror(errno)); 267 268 close(fd); 269 } 270 } 271 272 int 273 ipcp_WriteDNS(struct ipcp *ipcp) 274 { 275 const char *paddr; 276 mode_t mask; 277 FILE *fp; 278 279 if (ipcp->ns.dns[0].s_addr == INADDR_ANY && 280 ipcp->ns.dns[1].s_addr == INADDR_ANY) { 281 log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n", 282 _PATH_RESCONF); 283 return 0; 284 } 285 286 if (ipcp->ns.dns[0].s_addr == INADDR_ANY) { 287 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 288 ipcp->ns.dns[1].s_addr = INADDR_ANY; 289 } 290 291 mask = umask(022); 292 if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) { 293 umask(mask); 294 if (ipcp->ns.resolv_nons) 295 fputs(ipcp->ns.resolv_nons, fp); 296 paddr = inet_ntoa(ipcp->ns.dns[0]); 297 log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr); 298 fprintf(fp, "\nnameserver %s\n", paddr); 299 if (ipcp->ns.dns[1].s_addr != INADDR_ANY && 300 ipcp->ns.dns[1].s_addr != INADDR_NONE && 301 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) { 302 paddr = inet_ntoa(ipcp->ns.dns[1]); 303 log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr); 304 fprintf(fp, "nameserver %s\n", paddr); 305 } 306 if (fclose(fp) == EOF) { 307 log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF, 308 strerror(errno)); 309 return 0; 310 } 311 } else 312 umask(mask); 313 314 return 1; 315 } 316 317 void 318 ipcp_RestoreDNS(struct ipcp *ipcp) 319 { 320 if (ipcp->ns.resolver) { 321 ssize_t got; 322 size_t 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 %lu of %lu\n", 333 _PATH_RESCONF, (unsigned long)got, (unsigned 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, n; 514 515 ipcp->fsm.open_mode = 0; 516 ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; 517 518 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 519 /* Try to give the peer a previously configured IP address */ 520 for (n = 0; n < iface->addrs; n++) { 521 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 522 continue; 523 if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) { 524 ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos)); 525 break; 526 } 527 } 528 if (n == iface->addrs) 529 /* Ok, so none of 'em fit.... pick a random one */ 530 ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list)); 531 532 ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr); 533 } 534 535 ipcp->heis1172 = 0; 536 ipcp->peer_req = 0; 537 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 538 ipcp->peer_compproto = 0; 539 540 if (ipcp->cfg.HaveTriggerAddress) { 541 /* 542 * Some implementations of PPP require that we send a 543 * *special* value as our address, even though the rfc specifies 544 * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). 545 */ 546 ipcp->my_ip = ipcp->cfg.TriggerAddress; 547 log_Printf(LogIPCP, "Using trigger address %s\n", 548 inet_ntoa(ipcp->cfg.TriggerAddress)); 549 } else { 550 /* 551 * Otherwise, if we've used an IP number before and it's still within 552 * the network specified on the ``set ifaddr'' line, we really 553 * want to keep that IP number so that we can keep any existing 554 * connections that are bound to that IP. 555 */ 556 for (n = 0; n < iface->addrs; n++) { 557 ncprange_getaddr(&iface->addr[n].ifa, &ipaddr); 558 if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) { 559 ncpaddr_getip4(&ipaddr, &ipcp->my_ip); 560 break; 561 } 562 } 563 if (n == iface->addrs) 564 ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip); 565 } 566 567 if (IsEnabled(ipcp->cfg.vj.neg) 568 #ifndef NORADIUS 569 || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) 570 #endif 571 ) 572 ipcp->my_compproto = (PROTO_VJCOMP << 16) + 573 ((ipcp->cfg.vj.slots - 1) << 8) + 574 ipcp->cfg.vj.slotcomp; 575 else 576 ipcp->my_compproto = 0; 577 sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); 578 579 ipcp->peer_reject = 0; 580 ipcp->my_reject = 0; 581 582 /* Copy startup values into ipcp->ns.dns */ 583 if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE) 584 memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns); 585 } 586 587 static int 588 numaddresses(struct in_addr mask) 589 { 590 u_int32_t bit, haddr; 591 int n; 592 593 haddr = ntohl(mask.s_addr); 594 bit = 1; 595 n = 1; 596 597 do { 598 if (!(haddr & bit)) 599 n <<= 1; 600 } while (bit <<= 1); 601 602 return n; 603 } 604 605 static int 606 ipcp_proxyarp(struct ipcp *ipcp, 607 int (*proxyfun)(struct bundle *, struct in_addr, int), 608 const struct iface_addr *addr) 609 { 610 struct bundle *bundle = ipcp->fsm.bundle; 611 struct in_addr peer, mask, ip; 612 int n, ret, s; 613 614 if (!ncpaddr_getip4(&addr->peer, &peer)) { 615 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); 616 return 0; 617 } 618 619 if ((s = ID0socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 620 log_Printf(LogERROR, "ipcp_proxyarp: socket: %s\n", 621 strerror(errno)); 622 return 0; 623 } 624 625 ret = 0; 626 627 if (Enabled(bundle, OPT_PROXYALL)) { 628 ncprange_getip4mask(&addr->ifa, &mask); 629 if ((n = numaddresses(mask)) > 256) { 630 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", 631 ncprange_ntoa(&addr->ifa)); 632 return 0; 633 } 634 ip.s_addr = peer.s_addr & mask.s_addr; 635 if (n >= 4) { 636 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 637 n -= 2; 638 } 639 while (n) { 640 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { 641 if (!(ret = (*proxyfun)(bundle, ip, s))) 642 break; 643 n--; 644 } 645 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 646 } 647 ret = !n; 648 } else if (Enabled(bundle, OPT_PROXY)) 649 ret = (*proxyfun)(bundle, peer, s); 650 651 close(s); 652 653 return ret; 654 } 655 656 static int 657 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, 658 struct in_addr hisaddr) 659 { 660 struct bundle *bundle = ipcp->fsm.bundle; 661 struct ncpaddr myncpaddr, hisncpaddr; 662 struct ncprange myrange; 663 struct in_addr mask; 664 struct sockaddr_storage ssdst, ssgw, ssmask; 665 struct sockaddr *sadst, *sagw, *samask; 666 667 sadst = (struct sockaddr *)&ssdst; 668 sagw = (struct sockaddr *)&ssgw; 669 samask = (struct sockaddr *)&ssmask; 670 671 ncpaddr_setip4(&hisncpaddr, hisaddr); 672 ncpaddr_setip4(&myncpaddr, myaddr); 673 ncprange_sethost(&myrange, &myncpaddr); 674 675 mask = addr2mask(myaddr); 676 677 if (ipcp->ifmask.s_addr != INADDR_ANY && 678 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) 679 ncprange_setip4mask(&myrange, ipcp->ifmask); 680 681 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, 682 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) 683 return 0; 684 685 if (!Enabled(bundle, OPT_IFACEALIAS)) 686 iface_Clear(bundle->iface, &bundle->ncp, AF_INET, 687 IFACE_CLEAR_ALIASES|IFACE_SYSTEM); 688 689 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { 690 ncprange_getsa(&myrange, &ssgw, &ssmask); 691 ncpaddr_getsa(&hisncpaddr, &ssdst); 692 rt_Update(bundle, sadst, sagw, samask); 693 } 694 695 if (Enabled(bundle, OPT_SROUTES)) 696 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); 697 698 #ifndef NORADIUS 699 if (bundle->radius.valid) 700 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); 701 #endif 702 703 return 1; /* Ok */ 704 } 705 706 static struct in_addr 707 ChooseHisAddr(struct bundle *bundle, struct in_addr gw) 708 { 709 struct in_addr try; 710 u_long f; 711 712 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { 713 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); 714 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", 715 f, inet_ntoa(try)); 716 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { 717 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); 718 break; 719 } 720 } 721 722 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { 723 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 724 try.s_addr = INADDR_ANY; 725 } 726 727 return try; 728 } 729 730 static void 731 IpcpInitRestartCounter(struct fsm *fp, int what) 732 { 733 /* Set fsm timer load */ 734 struct ipcp *ipcp = fsm2ipcp(fp); 735 736 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; 737 switch (what) { 738 case FSM_REQ_TIMER: 739 fp->restart = ipcp->cfg.fsm.maxreq; 740 break; 741 case FSM_TRM_TIMER: 742 fp->restart = ipcp->cfg.fsm.maxtrm; 743 break; 744 default: 745 fp->restart = 1; 746 break; 747 } 748 } 749 750 static void 751 IpcpSendConfigReq(struct fsm *fp) 752 { 753 /* Send config REQ please */ 754 struct physical *p = link2physical(fp->link); 755 struct ipcp *ipcp = fsm2ipcp(fp); 756 u_char buff[24]; 757 struct fsm_opt *o; 758 759 o = (struct fsm_opt *)buff; 760 761 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { 762 memcpy(o->data, &ipcp->my_ip.s_addr, 4); 763 INC_FSM_OPT(TY_IPADDR, 6, o); 764 } 765 766 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { 767 if (ipcp->heis1172) { 768 u_int16_t proto = PROTO_VJCOMP; 769 770 ua_htons(&proto, o->data); 771 INC_FSM_OPT(TY_COMPPROTO, 4, o); 772 } else { 773 struct compreq req; 774 775 req.proto = htons(ipcp->my_compproto >> 16); 776 req.slots = (ipcp->my_compproto >> 8) & 255; 777 req.compcid = ipcp->my_compproto & 1; 778 memcpy(o->data, &req, 4); 779 INC_FSM_OPT(TY_COMPPROTO, 6, o); 780 } 781 } 782 783 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 784 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { 785 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); 786 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); 787 } 788 789 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { 790 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); 791 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); 792 } 793 } 794 795 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 796 MB_IPCPOUT); 797 } 798 799 static void 800 IpcpSentTerminateReq(struct fsm *fp) 801 { 802 /* Term REQ just sent by FSM */ 803 } 804 805 static void 806 IpcpSendTerminateAck(struct fsm *fp, u_char id) 807 { 808 /* Send Term ACK please */ 809 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); 810 } 811 812 static void 813 IpcpLayerStart(struct fsm *fp) 814 { 815 /* We're about to start up ! */ 816 struct ipcp *ipcp = fsm2ipcp(fp); 817 818 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); 819 throughput_start(&ipcp->throughput, "IPCP throughput", 820 Enabled(fp->bundle, OPT_THROUGHPUT)); 821 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 822 ipcp->peer_req = 0; 823 } 824 825 static void 826 IpcpLayerFinish(struct fsm *fp) 827 { 828 /* We're now down */ 829 struct ipcp *ipcp = fsm2ipcp(fp); 830 831 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); 832 throughput_stop(&ipcp->throughput); 833 throughput_log(&ipcp->throughput, LogIPCP, NULL); 834 } 835 836 /* 837 * Called from iface_Add() via ncp_IfaceAddrAdded() 838 */ 839 void 840 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr) 841 { 842 struct bundle *bundle = ipcp->fsm.bundle; 843 844 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 845 ipcp_proxyarp(ipcp, arp_SetProxy, addr); 846 } 847 848 /* 849 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() 850 */ 851 void 852 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) 853 { 854 struct bundle *bundle = ipcp->fsm.bundle; 855 856 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 857 ipcp_proxyarp(ipcp, arp_ClearProxy, addr); 858 } 859 860 static void 861 IpcpLayerDown(struct fsm *fp) 862 { 863 /* About to come down */ 864 struct ipcp *ipcp = fsm2ipcp(fp); 865 static int recursing; 866 char addr[16]; 867 868 if (!recursing++) { 869 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); 870 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); 871 872 #ifndef NORADIUS 873 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, 874 fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask, 875 &ipcp->throughput); 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 #endif 940 941 /* 942 * XXX this stuff should really live in the FSM. Our config should 943 * associate executable sections in files with events. 944 */ 945 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { 946 if (bundle_GetLabel(fp->bundle)) { 947 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 948 LINKUPFILE, NULL, NULL) < 0) 949 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 950 } else 951 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 952 } 953 954 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 955 log_DisplayPrompts(); 956 957 return 1; 958 } 959 960 static void 961 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) 962 { 963 struct bundle *bundle = ipcp->fsm.bundle; 964 struct iface *iface = bundle->iface; 965 struct in_addr myaddr, peer; 966 int n; 967 968 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 969 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 970 if (ip.s_addr == INADDR_ANY || 971 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || 972 !ipcp_SetIPaddress(ipcp, myaddr, ip)) { 973 log_Printf(LogIPCP, "%s: Address invalid or already in use\n", 974 inet_ntoa(ip)); 975 /* 976 * If we've already had a valid address configured for the peer, 977 * try NAKing with that so that we don't have to upset things 978 * too much. 979 */ 980 for (n = 0; n < iface->addrs; n++) { 981 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 982 continue; 983 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { 984 ipcp->peer_ip = peer; 985 break; 986 } 987 } 988 989 if (n == iface->addrs) { 990 /* Just pick an IP number from our list */ 991 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); 992 } 993 994 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 995 *dec->rejend++ = TY_IPADDR; 996 *dec->rejend++ = 6; 997 memcpy(dec->rejend, &ip.s_addr, 4); 998 dec->rejend += 4; 999 } else { 1000 *dec->nakend++ = TY_IPADDR; 1001 *dec->nakend++ = 6; 1002 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1003 dec->nakend += 4; 1004 } 1005 return; 1006 } 1007 } else if (!ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { 1008 /* 1009 * If the destination address is not acceptable, NAK with what we 1010 * want to use. 1011 */ 1012 *dec->nakend++ = TY_IPADDR; 1013 *dec->nakend++ = 6; 1014 for (n = 0; n < iface->addrs; n++) 1015 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { 1016 /* We prefer the already-configured address */ 1017 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); 1018 break; 1019 } 1020 1021 if (n == iface->addrs) 1022 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1023 1024 dec->nakend += 4; 1025 return; 1026 } 1027 1028 ipcp->peer_ip = ip; 1029 *dec->ackend++ = TY_IPADDR; 1030 *dec->ackend++ = 6; 1031 memcpy(dec->ackend, &ip.s_addr, 4); 1032 dec->ackend += 4; 1033 } 1034 1035 static void 1036 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 1037 struct fsm_decode *dec) 1038 { 1039 /* Deal with incoming PROTO_IPCP */ 1040 struct ncpaddr ncpaddr; 1041 struct ipcp *ipcp = fsm2ipcp(fp); 1042 int gotdnsnak; 1043 u_int32_t compproto; 1044 struct compreq *pcomp; 1045 struct in_addr ipaddr, dstipaddr, have_ip; 1046 char tbuff[100], tbuff2[100]; 1047 struct fsm_opt *opt, nak; 1048 1049 gotdnsnak = 0; 1050 1051 while (end - cp >= sizeof(opt->hdr)) { 1052 if ((opt = fsm_readopt(&cp)) == NULL) 1053 break; 1054 1055 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), 1056 opt->hdr.len); 1057 1058 switch (opt->hdr.id) { 1059 case TY_IPADDR: /* RFC1332 */ 1060 memcpy(&ipaddr.s_addr, opt->data, 4); 1061 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1062 1063 switch (mode_type) { 1064 case MODE_REQ: 1065 ipcp->peer_req = 1; 1066 ipcp_ValidateReq(ipcp, ipaddr, dec); 1067 break; 1068 1069 case MODE_NAK: 1070 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { 1071 /* Use address suggested by peer */ 1072 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, 1073 inet_ntoa(ipcp->my_ip)); 1074 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); 1075 ipcp->my_ip = ipaddr; 1076 ncpaddr_setip4(&ncpaddr, ipcp->my_ip); 1077 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); 1078 } else { 1079 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, 1080 "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); 1081 fsm_Close(&ipcp->fsm); 1082 } 1083 break; 1084 1085 case MODE_REJ: 1086 ipcp->peer_reject |= (1 << opt->hdr.id); 1087 break; 1088 } 1089 break; 1090 1091 case TY_COMPPROTO: 1092 pcomp = (struct compreq *)opt->data; 1093 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + 1094 pcomp->compcid; 1095 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); 1096 1097 switch (mode_type) { 1098 case MODE_REQ: 1099 if (!IsAccepted(ipcp->cfg.vj.neg)) 1100 fsm_rej(dec, opt); 1101 else { 1102 switch (opt->hdr.len) { 1103 case 4: /* RFC1172 */ 1104 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1105 log_Printf(LogWARN, "Peer is speaking RFC1172 compression " 1106 "protocol !\n"); 1107 ipcp->heis1172 = 1; 1108 ipcp->peer_compproto = compproto; 1109 fsm_ack(dec, opt); 1110 } else { 1111 pcomp->proto = htons(PROTO_VJCOMP); 1112 nak.hdr.id = TY_COMPPROTO; 1113 nak.hdr.len = 4; 1114 memcpy(nak.data, &pcomp, 2); 1115 fsm_nak(dec, &nak); 1116 } 1117 break; 1118 case 6: /* RFC1332 */ 1119 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1120 if (pcomp->slots <= MAX_VJ_STATES 1121 && pcomp->slots >= MIN_VJ_STATES) { 1122 /* Ok, we can do that */ 1123 ipcp->peer_compproto = compproto; 1124 ipcp->heis1172 = 0; 1125 fsm_ack(dec, opt); 1126 } else { 1127 /* Get as close as we can to what he wants */ 1128 ipcp->heis1172 = 0; 1129 pcomp->slots = pcomp->slots < MIN_VJ_STATES ? 1130 MIN_VJ_STATES : MAX_VJ_STATES; 1131 nak.hdr.id = TY_COMPPROTO; 1132 nak.hdr.len = 4; 1133 memcpy(nak.data, &pcomp, 2); 1134 fsm_nak(dec, &nak); 1135 } 1136 } else { 1137 /* What we really want */ 1138 pcomp->proto = htons(PROTO_VJCOMP); 1139 pcomp->slots = DEF_VJ_STATES; 1140 pcomp->compcid = 1; 1141 nak.hdr.id = TY_COMPPROTO; 1142 nak.hdr.len = 6; 1143 memcpy(nak.data, &pcomp, sizeof pcomp); 1144 fsm_nak(dec, &nak); 1145 } 1146 break; 1147 default: 1148 fsm_rej(dec, opt); 1149 break; 1150 } 1151 } 1152 break; 1153 1154 case MODE_NAK: 1155 if (ntohs(pcomp->proto) == PROTO_VJCOMP) { 1156 if (pcomp->slots > MAX_VJ_STATES) 1157 pcomp->slots = MAX_VJ_STATES; 1158 else if (pcomp->slots < MIN_VJ_STATES) 1159 pcomp->slots = MIN_VJ_STATES; 1160 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + 1161 pcomp->compcid; 1162 } else 1163 compproto = 0; 1164 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", 1165 tbuff, ipcp->my_compproto, compproto); 1166 ipcp->my_compproto = compproto; 1167 break; 1168 1169 case MODE_REJ: 1170 ipcp->peer_reject |= (1 << opt->hdr.id); 1171 break; 1172 } 1173 break; 1174 1175 case TY_IPADDRS: /* RFC1172 */ 1176 memcpy(&ipaddr.s_addr, opt->data, 4); 1177 memcpy(&dstipaddr.s_addr, opt->data + 4, 4); 1178 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); 1179 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); 1180 1181 switch (mode_type) { 1182 case MODE_REQ: 1183 fsm_rej(dec, opt); 1184 break; 1185 1186 case MODE_NAK: 1187 case MODE_REJ: 1188 break; 1189 } 1190 break; 1191 1192 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ 1193 case TY_SECONDARY_DNS: 1194 memcpy(&ipaddr.s_addr, opt->data, 4); 1195 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1196 1197 switch (mode_type) { 1198 case MODE_REQ: 1199 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { 1200 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1201 fsm_rej(dec, opt); 1202 break; 1203 } 1204 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; 1205 1206 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && 1207 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { 1208 /* Swap 'em 'round */ 1209 ipcp->ns.dns[0] = ipcp->ns.dns[1]; 1210 ipcp->ns.dns[1] = have_ip; 1211 have_ip = ipcp->ns.dns[0]; 1212 } 1213 1214 if (ipaddr.s_addr != have_ip.s_addr) { 1215 /* 1216 * The client has got the DNS stuff wrong (first request) so 1217 * we'll tell 'em how it is 1218 */ 1219 nak.hdr.id = opt->hdr.id; 1220 nak.hdr.len = 6; 1221 memcpy(nak.data, &have_ip.s_addr, 4); 1222 fsm_nak(dec, &nak); 1223 } else { 1224 /* 1225 * Otherwise they have it right (this time) so we send a ack packet 1226 * back confirming it... end of story 1227 */ 1228 fsm_ack(dec, opt); 1229 } 1230 break; 1231 1232 case MODE_NAK: 1233 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 1234 gotdnsnak = 1; 1235 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, 1236 opt->data, 4); 1237 } 1238 break; 1239 1240 case MODE_REJ: /* Can't do much, stop asking */ 1241 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1242 break; 1243 } 1244 break; 1245 1246 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ 1247 case TY_SECONDARY_NBNS: 1248 memcpy(&ipaddr.s_addr, opt->data, 4); 1249 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1250 1251 switch (mode_type) { 1252 case MODE_REQ: 1253 have_ip.s_addr = 1254 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; 1255 1256 if (have_ip.s_addr == INADDR_ANY) { 1257 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); 1258 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1259 fsm_rej(dec, opt); 1260 break; 1261 } 1262 1263 if (ipaddr.s_addr != have_ip.s_addr) { 1264 nak.hdr.id = opt->hdr.id; 1265 nak.hdr.len = 6; 1266 memcpy(nak.data, &have_ip.s_addr, 4); 1267 fsm_nak(dec, &nak); 1268 } else 1269 fsm_ack(dec, opt); 1270 break; 1271 1272 case MODE_NAK: 1273 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); 1274 break; 1275 1276 case MODE_REJ: 1277 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); 1278 break; 1279 } 1280 break; 1281 1282 default: 1283 if (mode_type != MODE_NOP) { 1284 ipcp->my_reject |= (1 << opt->hdr.id); 1285 fsm_rej(dec, opt); 1286 } 1287 break; 1288 } 1289 } 1290 1291 if (gotdnsnak) { 1292 if (ipcp->ns.writable) { 1293 log_Printf(LogDEBUG, "Updating resolver\n"); 1294 if (!ipcp_WriteDNS(ipcp)) { 1295 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); 1296 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); 1297 } else 1298 bundle_AdjustDNS(fp->bundle); 1299 } else { 1300 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); 1301 bundle_AdjustDNS(fp->bundle); 1302 } 1303 } 1304 1305 if (mode_type != MODE_NOP) { 1306 if (mode_type == MODE_REQ && !ipcp->peer_req) { 1307 if (dec->rejend == dec->rej && dec->nakend == dec->nak) { 1308 /* 1309 * Pretend the peer has requested an IP. 1310 * We do this to ensure that we only send one NAK if the only 1311 * reason for the NAK is because the peer isn't sending a 1312 * TY_IPADDR REQ. This stops us from repeatedly trying to tell 1313 * the peer that we have to have an IP address on their end. 1314 */ 1315 ipcp->peer_req = 1; 1316 } 1317 ipaddr.s_addr = INADDR_ANY; 1318 ipcp_ValidateReq(ipcp, ipaddr, dec); 1319 } 1320 fsm_opt_normalise(dec); 1321 } 1322 } 1323 1324 extern struct mbuf * 1325 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1326 { 1327 /* Got PROTO_IPCP from link */ 1328 m_settype(bp, MB_IPCPIN); 1329 if (bundle_Phase(bundle) == PHASE_NETWORK) 1330 fsm_Input(&bundle->ncp.ipcp.fsm, bp); 1331 else { 1332 if (bundle_Phase(bundle) < PHASE_NETWORK) 1333 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", 1334 l->name, bundle_PhaseName(bundle)); 1335 m_freem(bp); 1336 } 1337 return NULL; 1338 } 1339 1340 int 1341 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) 1342 { 1343 struct ipcp *ipcp = &bundle->ncp.ipcp; 1344 struct in_addr myaddr; 1345 1346 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1347 iplist_reset(&ipcp->cfg.peer_list); 1348 ipcp->peer_ip = hisaddr; 1349 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); 1350 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1351 1352 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); 1353 } 1354 1355 int 1356 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) 1357 { 1358 struct in_addr myaddr; 1359 struct ncp *ncp = &bundle->ncp; 1360 struct ipcp *ipcp = &ncp->ipcp; 1361 struct ncpaddr ncpaddr; 1362 1363 /* Use `hisaddr' for the peers address (set iface if `setaddr') */ 1364 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1365 iplist_reset(&ipcp->cfg.peer_list); 1366 if (strpbrk(hisaddr, ",-")) { 1367 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); 1368 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 1369 iplist_setrandpos(&ipcp->cfg.peer_list); 1370 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); 1371 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1372 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); 1373 return 0; 1374 } 1375 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); 1376 } else { 1377 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); 1378 return 0; 1379 } 1380 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { 1381 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { 1382 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); 1383 return 0; 1384 } 1385 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1386 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 1387 1388 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) 1389 return 0; 1390 } else 1391 return 0; 1392 1393 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); 1394 bundle_AdjustFilters(bundle, NULL, &ncpaddr); 1395 1396 return 1; /* Ok */ 1397 } 1398 1399 struct in_addr 1400 addr2mask(struct in_addr addr) 1401 { 1402 u_int32_t haddr = ntohl(addr.s_addr); 1403 1404 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : 1405 IN_CLASSB(haddr) ? IN_CLASSB_NET : 1406 IN_CLASSC_NET; 1407 addr.s_addr = htonl(haddr); 1408 1409 return addr; 1410 } 1411 1412 size_t 1413 ipcp_QueueLen(struct ipcp *ipcp) 1414 { 1415 struct mqueue *q; 1416 size_t result; 1417 1418 result = 0; 1419 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) 1420 result += q->len; 1421 1422 return result; 1423 } 1424 1425 int 1426 ipcp_PushPacket(struct ipcp *ipcp, struct link *l) 1427 { 1428 struct bundle *bundle = ipcp->fsm.bundle; 1429 struct mqueue *queue; 1430 struct mbuf *bp; 1431 int m_len; 1432 u_int32_t secs = 0; 1433 unsigned alivesecs = 0; 1434 1435 if (ipcp->fsm.state != ST_OPENED) 1436 return 0; 1437 1438 /* 1439 * If ccp is not open but is required, do nothing. 1440 */ 1441 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 1442 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 1443 return 0; 1444 } 1445 1446 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; 1447 do { 1448 if (queue->top) { 1449 bp = m_dequeue(queue); 1450 bp = mbuf_Read(bp, &secs, sizeof secs); 1451 bp = m_pullup(bp); 1452 m_len = m_length(bp); 1453 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, 1454 &alivesecs)) { 1455 if (secs == 0) 1456 secs = alivesecs; 1457 bundle_StartIdleTimer(bundle, secs); 1458 } 1459 link_PushPacket(l, bp, bundle, 0, PROTO_IP); 1460 ipcp_AddOutOctets(ipcp, m_len); 1461 return 1; 1462 } 1463 } while (queue-- != ipcp->Queue); 1464 1465 return 0; 1466 } 1467