1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 5 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 6 * Internet Initiative Japan, Inc (IIJ) 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #include <sys/param.h> 34 #include <netinet/in_systm.h> 35 #include <netinet/in.h> 36 #include <netinet/ip.h> 37 #include <arpa/inet.h> 38 #include <sys/socket.h> 39 #include <net/if.h> 40 #include <net/route.h> 41 #include <netdb.h> 42 #include <sys/un.h> 43 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <resolv.h> 47 #include <stdarg.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <sys/stat.h> 51 #include <termios.h> 52 #include <unistd.h> 53 54 #ifndef NONAT 55 #ifdef LOCALNAT 56 #include "alias.h" 57 #else 58 #include <alias.h> 59 #endif 60 #endif 61 62 #include "layer.h" 63 #include "ua.h" 64 #include "defs.h" 65 #include "command.h" 66 #include "mbuf.h" 67 #include "log.h" 68 #include "timer.h" 69 #include "fsm.h" 70 #include "proto.h" 71 #include "iplist.h" 72 #include "throughput.h" 73 #include "slcompress.h" 74 #include "lqr.h" 75 #include "hdlc.h" 76 #include "lcp.h" 77 #include "ncpaddr.h" 78 #include "ip.h" 79 #include "ipcp.h" 80 #include "filter.h" 81 #include "descriptor.h" 82 #include "vjcomp.h" 83 #include "async.h" 84 #include "ccp.h" 85 #include "link.h" 86 #include "physical.h" 87 #include "mp.h" 88 #ifndef NORADIUS 89 #include "radius.h" 90 #endif 91 #include "ipv6cp.h" 92 #include "ncp.h" 93 #include "bundle.h" 94 #include "id.h" 95 #include "arp.h" 96 #include "systems.h" 97 #include "prompt.h" 98 #include "route.h" 99 #include "iface.h" 100 101 #undef REJECTED 102 #define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) 103 #define issep(ch) ((ch) == ' ' || (ch) == '\t') 104 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') 105 106 struct compreq { 107 u_short proto; 108 u_char slots; 109 u_char compcid; 110 }; 111 112 static int IpcpLayerUp(struct fsm *); 113 static void IpcpLayerDown(struct fsm *); 114 static void IpcpLayerStart(struct fsm *); 115 static void IpcpLayerFinish(struct fsm *); 116 static void IpcpInitRestartCounter(struct fsm *, int); 117 static void IpcpSendConfigReq(struct fsm *); 118 static void IpcpSentTerminateReq(struct fsm *); 119 static void IpcpSendTerminateAck(struct fsm *, u_char); 120 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int, 121 struct fsm_decode *); 122 123 extern struct libalias *la; 124 125 static struct fsm_callbacks ipcp_Callbacks = { 126 IpcpLayerUp, 127 IpcpLayerDown, 128 IpcpLayerStart, 129 IpcpLayerFinish, 130 IpcpInitRestartCounter, 131 IpcpSendConfigReq, 132 IpcpSentTerminateReq, 133 IpcpSendTerminateAck, 134 IpcpDecodeConfig, 135 fsm_NullRecvResetReq, 136 fsm_NullRecvResetAck 137 }; 138 139 static const char * 140 protoname(int proto) 141 { 142 static struct { 143 int id; 144 const char *txt; 145 } cftypes[] = { 146 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ 147 { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */ 148 { 2, "COMPPROTO" }, /* IP-Compression-Protocol */ 149 { 3, "IPADDR" }, /* IP-Address */ 150 { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */ 151 { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */ 152 { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */ 153 { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */ 154 }; 155 unsigned f; 156 157 for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++) 158 if (cftypes[f].id == proto) 159 return cftypes[f].txt; 160 161 return NumStr(proto, NULL, 0); 162 } 163 164 void 165 ipcp_AddInOctets(struct ipcp *ipcp, int n) 166 { 167 throughput_addin(&ipcp->throughput, n); 168 } 169 170 void 171 ipcp_AddOutOctets(struct ipcp *ipcp, int n) 172 { 173 throughput_addout(&ipcp->throughput, n); 174 } 175 176 void 177 ipcp_LoadDNS(struct ipcp *ipcp) 178 { 179 int fd; 180 181 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE; 182 183 if (ipcp->ns.resolv != NULL) { 184 free(ipcp->ns.resolv); 185 ipcp->ns.resolv = NULL; 186 } 187 if (ipcp->ns.resolv_nons != NULL) { 188 free(ipcp->ns.resolv_nons); 189 ipcp->ns.resolv_nons = NULL; 190 } 191 ipcp->ns.resolver = 0; 192 193 if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) { 194 struct stat st; 195 196 if (fstat(fd, &st) == 0) { 197 ssize_t got; 198 199 /* 200 * Note, ns.resolv and ns.resolv_nons are assumed to always point to 201 * buffers of the same size! See the strcpy() below. 202 */ 203 if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL) 204 log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n", 205 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 206 else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) { 207 log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n", 208 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); 209 free(ipcp->ns.resolv_nons); 210 ipcp->ns.resolv_nons = NULL; 211 } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) { 212 if (got == -1) 213 log_Printf(LogERROR, "Failed to read %s: %s\n", 214 _PATH_RESCONF, strerror(errno)); 215 else 216 log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n", 217 _PATH_RESCONF, (unsigned long)got, 218 (unsigned long)st.st_size); 219 free(ipcp->ns.resolv_nons); 220 ipcp->ns.resolv_nons = NULL; 221 free(ipcp->ns.resolv); 222 ipcp->ns.resolv = NULL; 223 } else { 224 char *cp, *cp_nons, *ncp, ch; 225 int n; 226 227 ipcp->ns.resolv[st.st_size] = '\0'; 228 ipcp->ns.resolver = 1; 229 230 cp_nons = ipcp->ns.resolv_nons; 231 cp = ipcp->ns.resolv; 232 n = 0; 233 234 while ((ncp = strstr(cp, "nameserver")) != NULL) { 235 if (ncp != cp) { 236 memcpy(cp_nons, cp, ncp - cp); 237 cp_nons += ncp - cp; 238 } 239 if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) { 240 memcpy(cp_nons, ncp, 9); 241 cp_nons += 9; 242 cp = ncp + 9; /* Can't match "nameserver" at cp... */ 243 continue; 244 } 245 246 for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */ 247 ; 248 249 for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */ 250 ; 251 252 ch = *ncp; 253 *ncp = '\0'; 254 if (n < 2 && inet_aton(cp, ipcp->ns.dns)) 255 n++; 256 *ncp = ch; 257 258 if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */ 259 cp = ncp + strlen(ncp); 260 else 261 cp++; 262 } 263 /* 264 * Note, cp_nons and cp always point to buffers of the same size, so 265 * strcpy is ok! 266 */ 267 strcpy(cp_nons, cp); /* Copy the end - including the NUL */ 268 cp_nons += strlen(cp_nons) - 1; 269 while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n') 270 *cp_nons-- = '\0'; 271 if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) { 272 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 273 ipcp->ns.dns[1].s_addr = INADDR_ANY; 274 } 275 bundle_AdjustDNS(ipcp->fsm.bundle); 276 } 277 } else 278 log_Printf(LogERROR, "Failed to stat opened %s: %s\n", 279 _PATH_RESCONF, strerror(errno)); 280 281 close(fd); 282 } 283 } 284 285 int 286 ipcp_WriteDNS(struct ipcp *ipcp) 287 { 288 const char *paddr; 289 mode_t mask; 290 FILE *fp; 291 292 if (ipcp->ns.dns[0].s_addr == INADDR_ANY && 293 ipcp->ns.dns[1].s_addr == INADDR_ANY) { 294 log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n", 295 _PATH_RESCONF); 296 return 0; 297 } 298 299 if (ipcp->ns.dns[0].s_addr == INADDR_ANY) { 300 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; 301 ipcp->ns.dns[1].s_addr = INADDR_ANY; 302 } 303 304 mask = umask(022); 305 if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) { 306 umask(mask); 307 if (ipcp->ns.resolv_nons) 308 fputs(ipcp->ns.resolv_nons, fp); 309 paddr = inet_ntoa(ipcp->ns.dns[0]); 310 log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr); 311 fprintf(fp, "\nnameserver %s\n", paddr); 312 if (ipcp->ns.dns[1].s_addr != INADDR_ANY && 313 ipcp->ns.dns[1].s_addr != INADDR_NONE && 314 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) { 315 paddr = inet_ntoa(ipcp->ns.dns[1]); 316 log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr); 317 fprintf(fp, "nameserver %s\n", paddr); 318 } 319 if (fclose(fp) == EOF) { 320 log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF, 321 strerror(errno)); 322 return 0; 323 } 324 } else { 325 umask(mask); 326 log_Printf(LogERROR,"fopen(\"%s\", \"w\") failed: %s\n", _PATH_RESCONF, 327 strerror(errno)); 328 } 329 330 return 1; 331 } 332 333 void 334 ipcp_RestoreDNS(struct ipcp *ipcp) 335 { 336 if (ipcp->ns.resolver) { 337 ssize_t got, len; 338 int fd; 339 340 if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) { 341 len = strlen(ipcp->ns.resolv); 342 if ((got = write(fd, ipcp->ns.resolv, len)) != len) { 343 if (got == -1) 344 log_Printf(LogERROR, "Failed rewriting %s: write: %s\n", 345 _PATH_RESCONF, strerror(errno)); 346 else 347 log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n", 348 _PATH_RESCONF, (long)got, (long)len); 349 } 350 close(fd); 351 } else 352 log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF, 353 strerror(errno)); 354 } else if (remove(_PATH_RESCONF) == -1) 355 log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF, 356 strerror(errno)); 357 358 } 359 360 int 361 ipcp_Show(struct cmdargs const *arg) 362 { 363 struct ipcp *ipcp = &arg->bundle->ncp.ipcp; 364 365 prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name, 366 State2Nam(ipcp->fsm.state)); 367 if (ipcp->fsm.state == ST_OPENED) { 368 prompt_Printf(arg->prompt, " His side: %s, %s\n", 369 inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto)); 370 prompt_Printf(arg->prompt, " My side: %s, %s\n", 371 inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto)); 372 prompt_Printf(arg->prompt, " Queued packets: %lu\n", 373 (unsigned long)ipcp_QueueLen(ipcp)); 374 } 375 376 prompt_Printf(arg->prompt, "\nDefaults:\n"); 377 prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config" 378 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout, 379 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s", 380 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s"); 381 prompt_Printf(arg->prompt, " My Address: %s\n", 382 ncprange_ntoa(&ipcp->cfg.my_range)); 383 if (ipcp->cfg.HaveTriggerAddress) 384 prompt_Printf(arg->prompt, " Trigger address: %s\n", 385 inet_ntoa(ipcp->cfg.TriggerAddress)); 386 387 prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot " 388 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg), 389 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without"); 390 391 if (iplist_isvalid(&ipcp->cfg.peer_list)) 392 prompt_Printf(arg->prompt, " His Address: %s\n", 393 ipcp->cfg.peer_list.src); 394 else 395 prompt_Printf(arg->prompt, " His Address: %s\n", 396 ncprange_ntoa(&ipcp->cfg.peer_range)); 397 398 prompt_Printf(arg->prompt, " DNS: %s", 399 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ? 400 "none" : inet_ntoa(ipcp->cfg.ns.dns[0])); 401 if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE) 402 prompt_Printf(arg->prompt, ", %s", 403 inet_ntoa(ipcp->cfg.ns.dns[1])); 404 prompt_Printf(arg->prompt, ", %s\n", 405 command_ShowNegval(ipcp->cfg.ns.dns_neg)); 406 prompt_Printf(arg->prompt, " Resolver DNS: %s", 407 ipcp->ns.dns[0].s_addr == INADDR_NONE ? 408 "none" : inet_ntoa(ipcp->ns.dns[0])); 409 if (ipcp->ns.dns[1].s_addr != INADDR_NONE && 410 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) 411 prompt_Printf(arg->prompt, ", %s", 412 inet_ntoa(ipcp->ns.dns[1])); 413 prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ", 414 inet_ntoa(ipcp->cfg.ns.nbns[0])); 415 prompt_Printf(arg->prompt, "%s\n\n", 416 inet_ntoa(ipcp->cfg.ns.nbns[1])); 417 418 throughput_disp(&ipcp->throughput, arg->prompt); 419 420 return 0; 421 } 422 423 int 424 ipcp_vjset(struct cmdargs const *arg) 425 { 426 if (arg->argc != arg->argn+2) 427 return -1; 428 if (!strcasecmp(arg->argv[arg->argn], "slots")) { 429 int slots; 430 431 slots = atoi(arg->argv[arg->argn+1]); 432 if (slots < 4 || slots > 16) 433 return 1; 434 arg->bundle->ncp.ipcp.cfg.vj.slots = slots; 435 return 0; 436 } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) { 437 if (!strcasecmp(arg->argv[arg->argn+1], "on")) 438 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1; 439 else if (!strcasecmp(arg->argv[arg->argn+1], "off")) 440 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0; 441 else 442 return 2; 443 return 0; 444 } 445 return -1; 446 } 447 448 void 449 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l, 450 const struct fsm_parent *parent) 451 { 452 struct hostent *hp; 453 struct in_addr host; 454 char name[MAXHOSTNAMELEN]; 455 static const char * const timer_names[] = 456 {"IPCP restart", "IPCP openmode", "IPCP stopped"}; 457 458 fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP, 459 bundle, l, parent, &ipcp_Callbacks, timer_names); 460 461 ipcp->cfg.vj.slots = DEF_VJ_STATES; 462 ipcp->cfg.vj.slotcomp = 1; 463 memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range); 464 465 host.s_addr = htonl(INADDR_LOOPBACK); 466 ipcp->cfg.netmask.s_addr = INADDR_ANY; 467 if (gethostname(name, sizeof name) == 0) { 468 hp = gethostbyname(name); 469 if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr) 470 memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr); 471 } 472 ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask); 473 ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask); 474 475 iplist_setsrc(&ipcp->cfg.peer_list, ""); 476 ipcp->cfg.HaveTriggerAddress = 0; 477 478 ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE; 479 ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE; 480 ipcp->cfg.ns.dns_neg = 0; 481 ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY; 482 ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY; 483 484 ipcp->cfg.fsm.timeout = DEF_FSMRETRY; 485 ipcp->cfg.fsm.maxreq = DEF_FSMTRIES; 486 ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES; 487 ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED; 488 489 memset(&ipcp->vj, '\0', sizeof ipcp->vj); 490 491 ipcp->ns.resolv = NULL; 492 ipcp->ns.resolv_nons = NULL; 493 ipcp->ns.writable = 1; 494 ipcp_LoadDNS(ipcp); 495 496 throughput_init(&ipcp->throughput, SAMPLE_PERIOD); 497 memset(ipcp->Queue, '\0', sizeof ipcp->Queue); 498 ipcp_Setup(ipcp, INADDR_NONE); 499 } 500 501 void 502 ipcp_Destroy(struct ipcp *ipcp) 503 { 504 throughput_destroy(&ipcp->throughput); 505 506 if (ipcp->ns.resolv != NULL) { 507 free(ipcp->ns.resolv); 508 ipcp->ns.resolv = NULL; 509 } 510 if (ipcp->ns.resolv_nons != NULL) { 511 free(ipcp->ns.resolv_nons); 512 ipcp->ns.resolv_nons = NULL; 513 } 514 } 515 516 void 517 ipcp_SetLink(struct ipcp *ipcp, struct link *l) 518 { 519 ipcp->fsm.link = l; 520 } 521 522 void 523 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask) 524 { 525 struct iface *iface = ipcp->fsm.bundle->iface; 526 struct ncpaddr ipaddr; 527 struct in_addr peer; 528 int pos; 529 unsigned n; 530 531 ipcp->fsm.open_mode = 0; 532 ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; 533 534 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 535 /* Try to give the peer a previously configured IP address */ 536 for (n = 0; n < iface->addrs; n++) { 537 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 538 continue; 539 if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) { 540 ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos)); 541 break; 542 } 543 } 544 if (n == iface->addrs) 545 /* Ok, so none of 'em fit.... pick a random one */ 546 ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list)); 547 548 ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr); 549 } 550 551 ipcp->heis1172 = 0; 552 ipcp->peer_req = 0; 553 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 554 ipcp->peer_compproto = 0; 555 556 if (ipcp->cfg.HaveTriggerAddress) { 557 /* 558 * Some implementations of PPP require that we send a 559 * *special* value as our address, even though the rfc specifies 560 * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). 561 */ 562 ipcp->my_ip = ipcp->cfg.TriggerAddress; 563 log_Printf(LogIPCP, "Using trigger address %s\n", 564 inet_ntoa(ipcp->cfg.TriggerAddress)); 565 } else { 566 /* 567 * Otherwise, if we've used an IP number before and it's still within 568 * the network specified on the ``set ifaddr'' line, we really 569 * want to keep that IP number so that we can keep any existing 570 * connections that are bound to that IP. 571 */ 572 for (n = 0; n < iface->addrs; n++) { 573 ncprange_getaddr(&iface->addr[n].ifa, &ipaddr); 574 if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) { 575 ncpaddr_getip4(&ipaddr, &ipcp->my_ip); 576 break; 577 } 578 } 579 if (n == iface->addrs) 580 ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip); 581 } 582 583 if (IsEnabled(ipcp->cfg.vj.neg) 584 #ifndef NORADIUS 585 || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) 586 #endif 587 ) 588 ipcp->my_compproto = (PROTO_VJCOMP << 16) + 589 ((ipcp->cfg.vj.slots - 1) << 8) + 590 ipcp->cfg.vj.slotcomp; 591 else 592 ipcp->my_compproto = 0; 593 sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); 594 595 ipcp->peer_reject = 0; 596 ipcp->my_reject = 0; 597 598 /* Copy startup values into ipcp->ns.dns */ 599 if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE) 600 memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns); 601 } 602 603 static int 604 numaddresses(struct in_addr mask) 605 { 606 u_int32_t bit, haddr; 607 int n; 608 609 haddr = ntohl(mask.s_addr); 610 bit = 1; 611 n = 1; 612 613 do { 614 if (!(haddr & bit)) 615 n <<= 1; 616 } while (bit <<= 1); 617 618 return n; 619 } 620 621 static int 622 ipcp_proxyarp(struct ipcp *ipcp, 623 int (*proxyfun)(struct bundle *, struct in_addr), 624 const struct iface_addr *addr) 625 { 626 struct bundle *bundle = ipcp->fsm.bundle; 627 struct in_addr peer, mask, ip; 628 int n, ret; 629 630 if (!ncpaddr_getip4(&addr->peer, &peer)) { 631 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); 632 return 0; 633 } 634 635 ret = 0; 636 637 if (Enabled(bundle, OPT_PROXYALL)) { 638 ncprange_getip4mask(&addr->ifa, &mask); 639 if ((n = numaddresses(mask)) > 256) { 640 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", 641 ncprange_ntoa(&addr->ifa)); 642 return 0; 643 } 644 ip.s_addr = peer.s_addr & mask.s_addr; 645 if (n >= 4) { 646 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 647 n -= 2; 648 } 649 while (n) { 650 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { 651 if (!(ret = (*proxyfun)(bundle, ip))) 652 break; 653 n--; 654 } 655 ip.s_addr = htonl(ntohl(ip.s_addr) + 1); 656 } 657 ret = !n; 658 } else if (Enabled(bundle, OPT_PROXY)) 659 ret = (*proxyfun)(bundle, peer); 660 661 return ret; 662 } 663 664 static int 665 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, 666 struct in_addr hisaddr) 667 { 668 struct bundle *bundle = ipcp->fsm.bundle; 669 struct ncpaddr myncpaddr, hisncpaddr; 670 struct ncprange myrange; 671 struct in_addr mask; 672 struct sockaddr_storage ssdst, ssgw, ssmask; 673 struct sockaddr *sadst, *sagw, *samask; 674 675 sadst = (struct sockaddr *)&ssdst; 676 sagw = (struct sockaddr *)&ssgw; 677 samask = (struct sockaddr *)&ssmask; 678 679 ncpaddr_setip4(&hisncpaddr, hisaddr); 680 ncpaddr_setip4(&myncpaddr, myaddr); 681 ncprange_sethost(&myrange, &myncpaddr); 682 683 mask = addr2mask(myaddr); 684 685 if (ipcp->ifmask.s_addr != INADDR_ANY && 686 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) 687 ncprange_setip4mask(&myrange, ipcp->ifmask); 688 689 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, 690 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) 691 return 0; 692 693 if (!Enabled(bundle, OPT_IFACEALIAS)) 694 iface_Clear(bundle->iface, &bundle->ncp, AF_INET, 695 IFACE_CLEAR_ALIASES|IFACE_SYSTEM); 696 697 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { 698 ncprange_getsa(&myrange, &ssgw, &ssmask); 699 ncpaddr_getsa(&hisncpaddr, &ssdst); 700 rt_Update(bundle, sadst, sagw, samask, NULL, NULL); 701 } 702 703 if (Enabled(bundle, OPT_SROUTES)) 704 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); 705 706 #ifndef NORADIUS 707 if (bundle->radius.valid) 708 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); 709 #endif 710 711 return 1; /* Ok */ 712 } 713 714 static struct in_addr 715 ChooseHisAddr(struct bundle *bundle, struct in_addr gw) 716 { 717 struct in_addr try; 718 u_long f; 719 720 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { 721 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); 722 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", 723 f, inet_ntoa(try)); 724 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { 725 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); 726 break; 727 } 728 } 729 730 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { 731 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 732 try.s_addr = INADDR_ANY; 733 } 734 735 return try; 736 } 737 738 static void 739 IpcpInitRestartCounter(struct fsm *fp, int what) 740 { 741 /* Set fsm timer load */ 742 struct ipcp *ipcp = fsm2ipcp(fp); 743 744 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; 745 switch (what) { 746 case FSM_REQ_TIMER: 747 fp->restart = ipcp->cfg.fsm.maxreq; 748 break; 749 case FSM_TRM_TIMER: 750 fp->restart = ipcp->cfg.fsm.maxtrm; 751 break; 752 default: 753 fp->restart = 1; 754 break; 755 } 756 } 757 758 static void 759 IpcpSendConfigReq(struct fsm *fp) 760 { 761 /* Send config REQ please */ 762 struct physical *p = link2physical(fp->link); 763 struct ipcp *ipcp = fsm2ipcp(fp); 764 u_char buff[MAX_FSM_OPT_LEN]; 765 struct fsm_opt *o; 766 767 o = (struct fsm_opt *)buff; 768 769 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { 770 memcpy(o->data, &ipcp->my_ip.s_addr, 4); 771 INC_FSM_OPT(TY_IPADDR, 6, o); 772 } 773 774 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { 775 if (ipcp->heis1172) { 776 u_int16_t proto = PROTO_VJCOMP; 777 778 ua_htons(&proto, o->data); 779 INC_FSM_OPT(TY_COMPPROTO, 4, o); 780 } else { 781 struct compreq req; 782 783 req.proto = htons(ipcp->my_compproto >> 16); 784 req.slots = (ipcp->my_compproto >> 8) & 255; 785 req.compcid = ipcp->my_compproto & 1; 786 memcpy(o->data, &req, 4); 787 INC_FSM_OPT(TY_COMPPROTO, 6, o); 788 } 789 } 790 791 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 792 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { 793 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); 794 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); 795 } 796 797 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { 798 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); 799 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); 800 } 801 } 802 803 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, 804 MB_IPCPOUT); 805 } 806 807 static void 808 IpcpSentTerminateReq(struct fsm *fp __unused) 809 { 810 /* Term REQ just sent by FSM */ 811 } 812 813 static void 814 IpcpSendTerminateAck(struct fsm *fp, u_char id) 815 { 816 /* Send Term ACK please */ 817 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); 818 } 819 820 static void 821 IpcpLayerStart(struct fsm *fp) 822 { 823 /* We're about to start up ! */ 824 struct ipcp *ipcp = fsm2ipcp(fp); 825 826 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); 827 throughput_start(&ipcp->throughput, "IPCP throughput", 828 Enabled(fp->bundle, OPT_THROUGHPUT)); 829 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 830 ipcp->peer_req = 0; 831 } 832 833 static void 834 IpcpLayerFinish(struct fsm *fp) 835 { 836 /* We're now down */ 837 struct ipcp *ipcp = fsm2ipcp(fp); 838 839 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); 840 throughput_stop(&ipcp->throughput); 841 throughput_log(&ipcp->throughput, LogIPCP, NULL); 842 } 843 844 /* 845 * Called from iface_Add() via ncp_IfaceAddrAdded() 846 */ 847 void 848 ipcp_IfaceAddrAdded(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_SetProxy, addr); 854 } 855 856 /* 857 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() 858 */ 859 void 860 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) 861 { 862 struct bundle *bundle = ipcp->fsm.bundle; 863 864 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) 865 ipcp_proxyarp(ipcp, arp_ClearProxy, addr); 866 } 867 868 static void 869 IpcpLayerDown(struct fsm *fp) 870 { 871 /* About to come down */ 872 struct ipcp *ipcp = fsm2ipcp(fp); 873 static int recursing; 874 char addr[16]; 875 876 if (!recursing++) { 877 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); 878 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); 879 880 #ifndef NORADIUS 881 radius_Flush(&fp->bundle->radius); 882 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, 883 fp->bundle->links, RAD_STOP, &ipcp->throughput); 884 885 if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 886 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE, 887 NULL, NULL); 888 radius_StopTimer(&fp->bundle->radius); 889 #endif 890 891 /* 892 * XXX this stuff should really live in the FSM. Our config should 893 * associate executable sections in files with events. 894 */ 895 if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) { 896 if (bundle_GetLabel(fp->bundle)) { 897 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 898 LINKDOWNFILE, NULL, NULL) < 0) 899 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 900 } else 901 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); 902 } 903 904 ipcp_Setup(ipcp, INADDR_NONE); 905 } 906 recursing--; 907 } 908 909 int 910 ipcp_InterfaceUp(struct ipcp *ipcp) 911 { 912 if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) { 913 log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); 914 return 0; 915 } 916 917 if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) { 918 log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n", 919 ipcp->fsm.bundle->iface->name); 920 return 0; 921 } 922 923 #ifndef NONAT 924 if (ipcp->fsm.bundle->NatEnabled) 925 LibAliasSetAddress(la, ipcp->my_ip); 926 #endif 927 928 return 1; 929 } 930 931 static int 932 IpcpLayerUp(struct fsm *fp) 933 { 934 /* We're now up */ 935 struct ipcp *ipcp = fsm2ipcp(fp); 936 char tbuff[16]; 937 938 log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); 939 snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); 940 log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", 941 tbuff, inet_ntoa(ipcp->peer_ip)); 942 943 if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) 944 sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); 945 946 if (!ipcp_InterfaceUp(ipcp)) 947 return 0; 948 949 #ifndef NORADIUS 950 radius_Account_Set_Ip(&fp->bundle->radacct, &ipcp->peer_ip, &ipcp->ifmask); 951 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links, 952 RAD_START, &ipcp->throughput); 953 954 if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) 955 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE, 956 NULL, NULL); 957 radius_StartTimer(fp->bundle); 958 #endif 959 960 /* 961 * XXX this stuff should really live in the FSM. Our config should 962 * associate executable sections in files with events. 963 */ 964 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { 965 if (bundle_GetLabel(fp->bundle)) { 966 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), 967 LINKUPFILE, NULL, NULL) < 0) 968 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 969 } else 970 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); 971 } 972 973 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; 974 log_DisplayPrompts(); 975 976 return 1; 977 } 978 979 static void 980 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) 981 { 982 struct bundle *bundle = ipcp->fsm.bundle; 983 struct iface *iface = bundle->iface; 984 struct in_addr myaddr, peer; 985 unsigned n; 986 987 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 988 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 989 if (ip.s_addr == INADDR_ANY || 990 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || 991 !ipcp_SetIPaddress(ipcp, myaddr, ip)) { 992 log_Printf(LogIPCP, "%s: Address invalid or already in use\n", 993 inet_ntoa(ip)); 994 /* 995 * If we've already had a valid address configured for the peer, 996 * try NAKing with that so that we don't have to upset things 997 * too much. 998 */ 999 for (n = 0; n < iface->addrs; n++) { 1000 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) 1001 continue; 1002 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { 1003 ipcp->peer_ip = peer; 1004 break; 1005 } 1006 } 1007 1008 if (n == iface->addrs) { 1009 /* Just pick an IP number from our list */ 1010 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); 1011 } 1012 1013 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1014 *dec->rejend++ = TY_IPADDR; 1015 *dec->rejend++ = 6; 1016 memcpy(dec->rejend, &ip.s_addr, 4); 1017 dec->rejend += 4; 1018 } else { 1019 *dec->nakend++ = TY_IPADDR; 1020 *dec->nakend++ = 6; 1021 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1022 dec->nakend += 4; 1023 } 1024 return; 1025 } 1026 } else if (ip.s_addr == INADDR_ANY || 1027 !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { 1028 /* 1029 * If the destination address is not acceptable, NAK with what we 1030 * want to use. 1031 */ 1032 *dec->nakend++ = TY_IPADDR; 1033 *dec->nakend++ = 6; 1034 for (n = 0; n < iface->addrs; n++) 1035 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { 1036 /* We prefer the already-configured address */ 1037 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); 1038 break; 1039 } 1040 1041 if (n == iface->addrs) 1042 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); 1043 1044 dec->nakend += 4; 1045 return; 1046 } 1047 1048 ipcp->peer_ip = ip; 1049 *dec->ackend++ = TY_IPADDR; 1050 *dec->ackend++ = 6; 1051 memcpy(dec->ackend, &ip.s_addr, 4); 1052 dec->ackend += 4; 1053 } 1054 1055 static void 1056 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, 1057 struct fsm_decode *dec) 1058 { 1059 /* Deal with incoming PROTO_IPCP */ 1060 struct ncpaddr ncpaddr; 1061 struct ipcp *ipcp = fsm2ipcp(fp); 1062 int gotdnsnak; 1063 u_int32_t compproto; 1064 struct compreq pcomp; 1065 struct in_addr ipaddr, dstipaddr, have_ip; 1066 char tbuff[100], tbuff2[100]; 1067 struct fsm_opt *opt, nak; 1068 1069 gotdnsnak = 0; 1070 1071 while (end - cp >= (int)sizeof(opt->hdr)) { 1072 if ((opt = fsm_readopt(&cp)) == NULL) 1073 break; 1074 1075 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), 1076 opt->hdr.len); 1077 1078 switch (opt->hdr.id) { 1079 case TY_IPADDR: /* RFC1332 */ 1080 memcpy(&ipaddr.s_addr, opt->data, 4); 1081 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1082 1083 switch (mode_type) { 1084 case MODE_REQ: 1085 ipcp->peer_req = 1; 1086 ipcp_ValidateReq(ipcp, ipaddr, dec); 1087 break; 1088 1089 case MODE_NAK: 1090 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { 1091 /* Use address suggested by peer */ 1092 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, 1093 inet_ntoa(ipcp->my_ip)); 1094 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); 1095 ipcp->my_ip = ipaddr; 1096 ncpaddr_setip4(&ncpaddr, ipcp->my_ip); 1097 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); 1098 } else { 1099 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, 1100 "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); 1101 fsm_Close(&ipcp->fsm); 1102 } 1103 break; 1104 1105 case MODE_REJ: 1106 ipcp->peer_reject |= (1 << opt->hdr.id); 1107 break; 1108 } 1109 break; 1110 1111 case TY_COMPPROTO: 1112 memcpy(&pcomp, opt->data, sizeof pcomp); 1113 compproto = (ntohs(pcomp.proto) << 16) + ((int)pcomp.slots << 8) + 1114 pcomp.compcid; 1115 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); 1116 1117 switch (mode_type) { 1118 case MODE_REQ: 1119 if (!IsAccepted(ipcp->cfg.vj.neg)) 1120 fsm_rej(dec, opt); 1121 else { 1122 switch (opt->hdr.len) { 1123 case 4: /* RFC1172 */ 1124 if (ntohs(pcomp.proto) == PROTO_VJCOMP) { 1125 log_Printf(LogWARN, "Peer is speaking RFC1172 compression " 1126 "protocol !\n"); 1127 ipcp->heis1172 = 1; 1128 ipcp->peer_compproto = compproto; 1129 fsm_ack(dec, opt); 1130 } else { 1131 pcomp.proto = htons(PROTO_VJCOMP); 1132 nak.hdr.id = TY_COMPPROTO; 1133 nak.hdr.len = 4; 1134 memcpy(nak.data, &pcomp, 2); 1135 fsm_nak(dec, &nak); 1136 } 1137 break; 1138 case 6: /* RFC1332 */ 1139 if (ntohs(pcomp.proto) == PROTO_VJCOMP) { 1140 /* We know pcomp.slots' max value == MAX_VJ_STATES */ 1141 if (pcomp.slots >= MIN_VJ_STATES) { 1142 /* Ok, we can do that */ 1143 ipcp->peer_compproto = compproto; 1144 ipcp->heis1172 = 0; 1145 fsm_ack(dec, opt); 1146 } else { 1147 /* Get as close as we can to what he wants */ 1148 ipcp->heis1172 = 0; 1149 pcomp.slots = MIN_VJ_STATES; 1150 nak.hdr.id = TY_COMPPROTO; 1151 nak.hdr.len = 4; 1152 memcpy(nak.data, &pcomp, 2); 1153 fsm_nak(dec, &nak); 1154 } 1155 } else { 1156 /* What we really want */ 1157 pcomp.proto = htons(PROTO_VJCOMP); 1158 pcomp.slots = DEF_VJ_STATES; 1159 pcomp.compcid = 1; 1160 nak.hdr.id = TY_COMPPROTO; 1161 nak.hdr.len = 6; 1162 memcpy(nak.data, &pcomp, sizeof pcomp); 1163 fsm_nak(dec, &nak); 1164 } 1165 break; 1166 default: 1167 fsm_rej(dec, opt); 1168 break; 1169 } 1170 } 1171 break; 1172 1173 case MODE_NAK: 1174 if (ntohs(pcomp.proto) == PROTO_VJCOMP) { 1175 /* We know pcomp.slots' max value == MAX_VJ_STATES */ 1176 if (pcomp.slots < MIN_VJ_STATES) 1177 pcomp.slots = MIN_VJ_STATES; 1178 compproto = (ntohs(pcomp.proto) << 16) + (pcomp.slots << 8) + 1179 pcomp.compcid; 1180 } else 1181 compproto = 0; 1182 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", 1183 tbuff, ipcp->my_compproto, compproto); 1184 ipcp->my_compproto = compproto; 1185 break; 1186 1187 case MODE_REJ: 1188 ipcp->peer_reject |= (1 << opt->hdr.id); 1189 break; 1190 } 1191 break; 1192 1193 case TY_IPADDRS: /* RFC1172 */ 1194 memcpy(&ipaddr.s_addr, opt->data, 4); 1195 memcpy(&dstipaddr.s_addr, opt->data + 4, 4); 1196 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); 1197 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); 1198 1199 switch (mode_type) { 1200 case MODE_REQ: 1201 fsm_rej(dec, opt); 1202 break; 1203 1204 case MODE_NAK: 1205 case MODE_REJ: 1206 break; 1207 } 1208 break; 1209 1210 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ 1211 case TY_SECONDARY_DNS: 1212 memcpy(&ipaddr.s_addr, opt->data, 4); 1213 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1214 1215 switch (mode_type) { 1216 case MODE_REQ: 1217 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { 1218 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1219 fsm_rej(dec, opt); 1220 break; 1221 } 1222 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; 1223 1224 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && 1225 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { 1226 /* Swap 'em 'round */ 1227 ipcp->ns.dns[0] = ipcp->ns.dns[1]; 1228 ipcp->ns.dns[1] = have_ip; 1229 have_ip = ipcp->ns.dns[0]; 1230 } 1231 1232 if (ipaddr.s_addr != have_ip.s_addr) { 1233 /* 1234 * The client has got the DNS stuff wrong (first request) so 1235 * we'll tell 'em how it is 1236 */ 1237 nak.hdr.id = opt->hdr.id; 1238 nak.hdr.len = 6; 1239 memcpy(nak.data, &have_ip.s_addr, 4); 1240 fsm_nak(dec, &nak); 1241 } else { 1242 /* 1243 * Otherwise they have it right (this time) so we send an ack packet 1244 * back confirming it... end of story 1245 */ 1246 fsm_ack(dec, opt); 1247 } 1248 break; 1249 1250 case MODE_NAK: 1251 if (IsEnabled(ipcp->cfg.ns.dns_neg)) { 1252 gotdnsnak = 1; 1253 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, 1254 opt->data, 4); 1255 } 1256 break; 1257 1258 case MODE_REJ: /* Can't do much, stop asking */ 1259 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1260 break; 1261 } 1262 break; 1263 1264 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ 1265 case TY_SECONDARY_NBNS: 1266 memcpy(&ipaddr.s_addr, opt->data, 4); 1267 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); 1268 1269 switch (mode_type) { 1270 case MODE_REQ: 1271 have_ip.s_addr = 1272 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; 1273 1274 if (have_ip.s_addr == INADDR_ANY) { 1275 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); 1276 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); 1277 fsm_rej(dec, opt); 1278 break; 1279 } 1280 1281 if (ipaddr.s_addr != have_ip.s_addr) { 1282 nak.hdr.id = opt->hdr.id; 1283 nak.hdr.len = 6; 1284 memcpy(nak.data, &have_ip.s_addr, 4); 1285 fsm_nak(dec, &nak); 1286 } else 1287 fsm_ack(dec, opt); 1288 break; 1289 1290 case MODE_NAK: 1291 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); 1292 break; 1293 1294 case MODE_REJ: 1295 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); 1296 break; 1297 } 1298 break; 1299 1300 default: 1301 if (mode_type != MODE_NOP) { 1302 ipcp->my_reject |= (1 << opt->hdr.id); 1303 fsm_rej(dec, opt); 1304 } 1305 break; 1306 } 1307 } 1308 1309 if (gotdnsnak) { 1310 if (ipcp->ns.writable) { 1311 log_Printf(LogDEBUG, "Updating resolver\n"); 1312 if (!ipcp_WriteDNS(ipcp)) { 1313 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); 1314 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); 1315 } else 1316 bundle_AdjustDNS(fp->bundle); 1317 } else { 1318 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); 1319 bundle_AdjustDNS(fp->bundle); 1320 } 1321 } 1322 1323 if (mode_type != MODE_NOP) { 1324 if (mode_type == MODE_REQ && !ipcp->peer_req) { 1325 if (dec->rejend == dec->rej && dec->nakend == dec->nak) { 1326 /* 1327 * Pretend the peer has requested an IP. 1328 * We do this to ensure that we only send one NAK if the only 1329 * reason for the NAK is because the peer isn't sending a 1330 * TY_IPADDR REQ. This stops us from repeatedly trying to tell 1331 * the peer that we have to have an IP address on their end. 1332 */ 1333 ipcp->peer_req = 1; 1334 } 1335 ipaddr.s_addr = INADDR_ANY; 1336 ipcp_ValidateReq(ipcp, ipaddr, dec); 1337 } 1338 fsm_opt_normalise(dec); 1339 } 1340 } 1341 1342 extern struct mbuf * 1343 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 1344 { 1345 /* Got PROTO_IPCP from link */ 1346 m_settype(bp, MB_IPCPIN); 1347 if (bundle_Phase(bundle) == PHASE_NETWORK) 1348 fsm_Input(&bundle->ncp.ipcp.fsm, bp); 1349 else { 1350 if (bundle_Phase(bundle) < PHASE_NETWORK) 1351 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", 1352 l->name, bundle_PhaseName(bundle)); 1353 m_freem(bp); 1354 } 1355 return NULL; 1356 } 1357 1358 int 1359 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) 1360 { 1361 struct ipcp *ipcp = &bundle->ncp.ipcp; 1362 struct in_addr myaddr; 1363 1364 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1365 iplist_reset(&ipcp->cfg.peer_list); 1366 ipcp->peer_ip = hisaddr; 1367 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); 1368 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1369 1370 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); 1371 } 1372 1373 int 1374 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) 1375 { 1376 struct in_addr myaddr; 1377 struct ncp *ncp = &bundle->ncp; 1378 struct ipcp *ipcp = &ncp->ipcp; 1379 struct ncpaddr ncpaddr; 1380 1381 /* Use `hisaddr' for the peers address (set iface if `setaddr') */ 1382 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); 1383 iplist_reset(&ipcp->cfg.peer_list); 1384 if (strpbrk(hisaddr, ",-")) { 1385 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); 1386 if (iplist_isvalid(&ipcp->cfg.peer_list)) { 1387 iplist_setrandpos(&ipcp->cfg.peer_list); 1388 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); 1389 if (ipcp->peer_ip.s_addr == INADDR_ANY) { 1390 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); 1391 return 0; 1392 } 1393 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); 1394 } else { 1395 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); 1396 return 0; 1397 } 1398 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { 1399 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { 1400 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); 1401 return 0; 1402 } 1403 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); 1404 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); 1405 1406 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) 1407 return 0; 1408 } else 1409 return 0; 1410 1411 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); 1412 bundle_AdjustFilters(bundle, NULL, &ncpaddr); 1413 1414 return 1; /* Ok */ 1415 } 1416 1417 struct in_addr 1418 addr2mask(struct in_addr addr) 1419 { 1420 u_int32_t haddr = ntohl(addr.s_addr); 1421 1422 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : 1423 IN_CLASSB(haddr) ? IN_CLASSB_NET : 1424 IN_CLASSC_NET; 1425 addr.s_addr = htonl(haddr); 1426 1427 return addr; 1428 } 1429 1430 size_t 1431 ipcp_QueueLen(struct ipcp *ipcp) 1432 { 1433 struct mqueue *q; 1434 size_t result; 1435 1436 result = 0; 1437 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) 1438 result += q->len; 1439 1440 return result; 1441 } 1442 1443 int 1444 ipcp_PushPacket(struct ipcp *ipcp, struct link *l) 1445 { 1446 struct bundle *bundle = ipcp->fsm.bundle; 1447 struct mqueue *queue; 1448 struct mbuf *bp; 1449 int m_len; 1450 u_int32_t secs = 0; 1451 unsigned alivesecs = 0; 1452 1453 if (ipcp->fsm.state != ST_OPENED) 1454 return 0; 1455 1456 /* 1457 * If ccp is not open but is required, do nothing. 1458 */ 1459 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 1460 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 1461 return 0; 1462 } 1463 1464 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; 1465 do { 1466 if (queue->top) { 1467 bp = m_dequeue(queue); 1468 bp = mbuf_Read(bp, &secs, sizeof secs); 1469 bp = m_pullup(bp); 1470 m_len = m_length(bp); 1471 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, 1472 &alivesecs)) { 1473 if (secs == 0) 1474 secs = alivesecs; 1475 bundle_StartIdleTimer(bundle, secs); 1476 } 1477 link_PushPacket(l, bp, bundle, 0, PROTO_IP); 1478 ipcp_AddOutOctets(ipcp, m_len); 1479 return 1; 1480 } 1481 } while (queue-- != ipcp->Queue); 1482 1483 return 0; 1484 } 1485