1 /*- 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * In-kernel nat support 21 */ 22 23 #include <sys/types.h> 24 #include <sys/socket.h> 25 #include <sys/sysctl.h> 26 27 #include "ipfw2.h" 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <netdb.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <sysexits.h> 37 38 #include <net/if.h> 39 #include <net/if_dl.h> 40 #include <net/route.h> /* def. of struct route */ 41 #include <netinet/in.h> 42 #include <netinet/ip_fw.h> 43 #include <arpa/inet.h> 44 #include <alias.h> 45 46 typedef int (nat_cb_t)(struct nat44_cfg_nat *cfg, void *arg); 47 static void nat_show_cfg(struct nat44_cfg_nat *n, void *arg); 48 static void nat_show_log(struct nat44_cfg_nat *n, void *arg); 49 static int nat_show_data(struct nat44_cfg_nat *cfg, void *arg); 50 static int natname_cmp(const void *a, const void *b); 51 static int nat_foreach(nat_cb_t *f, void *arg, int sort); 52 static int nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh); 53 54 static struct _s_x nat_params[] = { 55 { "ip", TOK_IP }, 56 { "if", TOK_IF }, 57 { "log", TOK_ALOG }, 58 { "deny_in", TOK_DENY_INC }, 59 { "same_ports", TOK_SAME_PORTS }, 60 { "unreg_only", TOK_UNREG_ONLY }, 61 { "unreg_cgn", TOK_UNREG_CGN }, 62 { "skip_global", TOK_SKIP_GLOBAL }, 63 { "reset", TOK_RESET_ADDR }, 64 { "reverse", TOK_ALIAS_REV }, 65 { "proxy_only", TOK_PROXY_ONLY }, 66 { "port_range", TOK_PORT_ALIAS }, 67 { "redirect_addr", TOK_REDIR_ADDR }, 68 { "redirect_port", TOK_REDIR_PORT }, 69 { "redirect_proto", TOK_REDIR_PROTO }, 70 { "udp_eim", TOK_UDP_EIM }, 71 { NULL, 0 } /* terminator */ 72 }; 73 74 75 /* 76 * Search for interface with name "ifn", and fill n accordingly: 77 * 78 * n->ip ip address of interface "ifn" 79 * n->if_name copy of interface name "ifn" 80 */ 81 static void 82 set_addr_dynamic(const char *ifn, struct nat44_cfg_nat *n) 83 { 84 size_t needed; 85 int mib[6]; 86 char *buf, *lim, *next; 87 struct if_msghdr *ifm; 88 struct ifa_msghdr *ifam; 89 struct sockaddr_dl *sdl; 90 struct sockaddr_in *sin; 91 int ifIndex; 92 93 mib[0] = CTL_NET; 94 mib[1] = PF_ROUTE; 95 mib[2] = 0; 96 mib[3] = AF_INET; 97 mib[4] = NET_RT_IFLIST; 98 mib[5] = 0; 99 /* 100 * Get interface data. 101 */ 102 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 103 err(1, "iflist-sysctl-estimate"); 104 buf = safe_calloc(1, needed); 105 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) 106 err(1, "iflist-sysctl-get"); 107 lim = buf + needed; 108 /* 109 * Loop through interfaces until one with 110 * given name is found. This is done to 111 * find correct interface index for routing 112 * message processing. 113 */ 114 ifIndex = 0; 115 next = buf; 116 while (next < lim) { 117 ifm = (struct if_msghdr *)next; 118 next += ifm->ifm_msglen; 119 if (ifm->ifm_version != RTM_VERSION) { 120 if (g_co.verbose) 121 warnx("routing message version %d " 122 "not understood", ifm->ifm_version); 123 continue; 124 } 125 if (ifm->ifm_type == RTM_IFINFO) { 126 sdl = (struct sockaddr_dl *)(ifm + 1); 127 if (strlen(ifn) == sdl->sdl_nlen && 128 strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { 129 ifIndex = ifm->ifm_index; 130 break; 131 } 132 } 133 } 134 if (!ifIndex) 135 errx(1, "unknown interface name %s", ifn); 136 /* 137 * Get interface address. 138 */ 139 sin = NULL; 140 while (next < lim) { 141 ifam = (struct ifa_msghdr *)next; 142 next += ifam->ifam_msglen; 143 if (ifam->ifam_version != RTM_VERSION) { 144 if (g_co.verbose) 145 warnx("routing message version %d " 146 "not understood", ifam->ifam_version); 147 continue; 148 } 149 if (ifam->ifam_type != RTM_NEWADDR) 150 break; 151 if (ifam->ifam_addrs & RTA_IFA) { 152 int i; 153 char *cp = (char *)(ifam + 1); 154 155 for (i = 1; i < RTA_IFA; i <<= 1) { 156 if (ifam->ifam_addrs & i) 157 cp += SA_SIZE((struct sockaddr *)cp); 158 } 159 if (((struct sockaddr *)cp)->sa_family == AF_INET) { 160 sin = (struct sockaddr_in *)cp; 161 break; 162 } 163 } 164 } 165 if (sin == NULL) 166 n->ip.s_addr = htonl(INADDR_ANY); 167 else 168 n->ip = sin->sin_addr; 169 strncpy(n->if_name, ifn, IF_NAMESIZE); 170 171 free(buf); 172 } 173 174 /* 175 * XXX - The following functions, macros and definitions come from natd.c: 176 * it would be better to move them outside natd.c, in a file 177 * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live 178 * with it. 179 */ 180 181 /* 182 * Definition of a port range, and macros to deal with values. 183 * FORMAT: HI 16-bits == first port in range, 0 == all ports. 184 * LO 16-bits == number of ports in range 185 * NOTES: - Port values are not stored in network byte order. 186 */ 187 188 #define port_range u_long 189 190 #define GETLOPORT(x) ((x) >> 0x10) 191 #define GETNUMPORTS(x) ((x) & 0x0000ffff) 192 #define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) 193 194 /* Set y to be the low-port value in port_range variable x. */ 195 #define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) 196 197 /* Set y to be the number of ports in port_range variable x. */ 198 #define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) 199 200 static void 201 StrToAddr (const char* str, struct in_addr* addr) 202 { 203 struct hostent* hp; 204 205 if (inet_aton (str, addr)) 206 return; 207 208 hp = gethostbyname (str); 209 if (!hp) 210 errx (1, "unknown host %s", str); 211 212 memcpy (addr, hp->h_addr, sizeof (struct in_addr)); 213 } 214 215 static int 216 StrToPortRange (const char* str, const char* proto, port_range *portRange) 217 { 218 char* sep; 219 struct servent* sp; 220 char* end; 221 u_short loPort; 222 u_short hiPort; 223 224 /* First see if this is a service, return corresponding port if so. */ 225 sp = getservbyname (str,proto); 226 if (sp) { 227 SETLOPORT(*portRange, ntohs(sp->s_port)); 228 SETNUMPORTS(*portRange, 1); 229 return 0; 230 } 231 232 /* Not a service, see if it's a single port or port range. */ 233 sep = strchr (str, '-'); 234 if (sep == NULL) { 235 SETLOPORT(*portRange, strtol(str, &end, 10)); 236 if (end != str) { 237 /* Single port. */ 238 SETNUMPORTS(*portRange, 1); 239 return 0; 240 } 241 242 /* Error in port range field. */ 243 errx (EX_DATAERR, "%s/%s: unknown service", str, proto); 244 } 245 246 /* Port range, get the values and sanity check. */ 247 sscanf (str, "%hu-%hu", &loPort, &hiPort); 248 SETLOPORT(*portRange, loPort); 249 SETNUMPORTS(*portRange, 0); /* Error by default */ 250 if (loPort <= hiPort) 251 SETNUMPORTS(*portRange, hiPort - loPort + 1); 252 253 if (GETNUMPORTS(*portRange) == 0) 254 errx (EX_DATAERR, "invalid port range %s", str); 255 256 return 0; 257 } 258 259 static int 260 StrToProto (const char* str) 261 { 262 if (!strcmp (str, "tcp")) 263 return IPPROTO_TCP; 264 265 if (!strcmp (str, "udp")) 266 return IPPROTO_UDP; 267 268 if (!strcmp (str, "sctp")) 269 return IPPROTO_SCTP; 270 errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str); 271 } 272 273 static int 274 StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, 275 port_range *portRange) 276 { 277 char* ptr; 278 279 ptr = strchr (str, ':'); 280 if (!ptr) 281 errx (EX_DATAERR, "%s is missing port number", str); 282 283 *ptr = '\0'; 284 ++ptr; 285 286 StrToAddr (str, addr); 287 return StrToPortRange (ptr, proto, portRange); 288 } 289 290 /* End of stuff taken from natd.c. */ 291 292 /* 293 * The next 3 functions add support for the addr, port and proto redirect and 294 * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() 295 * and SetupProtoRedirect() from natd.c. 296 * 297 * Every setup_* function fills at least one redirect entry 298 * (struct nat44_cfg_redir) and zero or more server pool entry 299 * (struct nat44_cfg_spool) in buf. 300 * 301 * The format of data in buf is: 302 * 303 * nat44_cfg_nat nat44_cfg_redir nat44_cfg_spool ...... nat44_cfg_spool 304 * 305 * ------------------------------------- ------------ 306 * | | .....X ..... | | | | ..... 307 * ------------------------------------- ...... ------------ 308 * ^ 309 * spool_cnt n=0 ...... n=(X-1) 310 * 311 * len points to the amount of available space in buf 312 * space counts the memory consumed by every function 313 * 314 * XXX - Every function get all the argv params so it 315 * has to check, in optional parameters, that the next 316 * args is a valid option for the redir entry and not 317 * another token. Only redir_port and redir_proto are 318 * affected by this. 319 */ 320 321 static int 322 estimate_redir_addr(int *ac, char ***av) 323 { 324 size_t space = sizeof(struct nat44_cfg_redir); 325 char *sep = **av; 326 u_int c = 0; 327 328 (void)ac; /* UNUSED */ 329 while ((sep = strchr(sep, ',')) != NULL) { 330 c++; 331 sep++; 332 } 333 334 if (c > 0) 335 c++; 336 337 space += c * sizeof(struct nat44_cfg_spool); 338 339 return (space); 340 } 341 342 static int 343 setup_redir_addr(char *buf, int *ac, char ***av) 344 { 345 struct nat44_cfg_redir *r; 346 char *sep; 347 size_t space; 348 349 r = (struct nat44_cfg_redir *)buf; 350 r->mode = REDIR_ADDR; 351 /* Skip nat44_cfg_redir at beginning of buf. */ 352 buf = &buf[sizeof(struct nat44_cfg_redir)]; 353 space = sizeof(struct nat44_cfg_redir); 354 355 /* Extract local address. */ 356 if (strchr(**av, ',') != NULL) { 357 struct nat44_cfg_spool *spool; 358 359 /* Setup LSNAT server pool. */ 360 r->laddr.s_addr = INADDR_NONE; 361 sep = strtok(**av, ","); 362 while (sep != NULL) { 363 spool = (struct nat44_cfg_spool *)buf; 364 space += sizeof(struct nat44_cfg_spool); 365 StrToAddr(sep, &spool->addr); 366 spool->port = ~0; 367 r->spool_cnt++; 368 /* Point to the next possible nat44_cfg_spool. */ 369 buf = &buf[sizeof(struct nat44_cfg_spool)]; 370 sep = strtok(NULL, ","); 371 } 372 } else 373 StrToAddr(**av, &r->laddr); 374 (*av)++; (*ac)--; 375 376 /* Extract public address. */ 377 StrToAddr(**av, &r->paddr); 378 (*av)++; (*ac)--; 379 380 return (space); 381 } 382 383 static int 384 estimate_redir_port(int *ac, char ***av) 385 { 386 size_t space = sizeof(struct nat44_cfg_redir); 387 char *sep = **av; 388 u_int c = 0; 389 390 (void)ac; /* UNUSED */ 391 while ((sep = strchr(sep, ',')) != NULL) { 392 c++; 393 sep++; 394 } 395 396 if (c > 0) 397 c++; 398 399 space += c * sizeof(struct nat44_cfg_spool); 400 401 return (space); 402 } 403 404 static int 405 setup_redir_port(char *buf, int *ac, char ***av) 406 { 407 struct nat44_cfg_redir *r; 408 char *sep, *protoName, *lsnat = NULL; 409 size_t space; 410 u_short numLocalPorts; 411 port_range portRange; 412 413 numLocalPorts = 0; 414 415 r = (struct nat44_cfg_redir *)buf; 416 r->mode = REDIR_PORT; 417 /* Skip nat44_cfg_redir at beginning of buf. */ 418 buf = &buf[sizeof(struct nat44_cfg_redir)]; 419 space = sizeof(struct nat44_cfg_redir); 420 421 /* 422 * Extract protocol. 423 */ 424 r->proto = StrToProto(**av); 425 protoName = **av; 426 (*av)++; (*ac)--; 427 428 /* 429 * Extract local address. 430 */ 431 if (strchr(**av, ',') != NULL) { 432 r->laddr.s_addr = INADDR_NONE; 433 r->lport = ~0; 434 numLocalPorts = 1; 435 lsnat = **av; 436 } else { 437 /* 438 * The sctp nat does not allow the port numbers to be mapped to 439 * new port numbers. Therefore, no ports are to be specified 440 * in the target port field. 441 */ 442 if (r->proto == IPPROTO_SCTP) { 443 if (strchr(**av, ':')) 444 errx(EX_DATAERR, "redirect_port:" 445 "port numbers do not change in sctp, so do " 446 "not specify them as part of the target"); 447 else 448 StrToAddr(**av, &r->laddr); 449 } else { 450 if (StrToAddrAndPortRange(**av, &r->laddr, protoName, 451 &portRange) != 0) 452 errx(EX_DATAERR, "redirect_port: " 453 "invalid local port range"); 454 455 r->lport = GETLOPORT(portRange); 456 numLocalPorts = GETNUMPORTS(portRange); 457 } 458 } 459 (*av)++; (*ac)--; 460 461 /* 462 * Extract public port and optionally address. 463 */ 464 if (strchr(**av, ':') != NULL) { 465 if (StrToAddrAndPortRange(**av, &r->paddr, protoName, 466 &portRange) != 0) 467 errx(EX_DATAERR, "redirect_port: " 468 "invalid public port range"); 469 } else { 470 r->paddr.s_addr = INADDR_ANY; 471 if (StrToPortRange(**av, protoName, &portRange) != 0) 472 errx(EX_DATAERR, "redirect_port: " 473 "invalid public port range"); 474 } 475 476 r->pport = GETLOPORT(portRange); 477 if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */ 478 numLocalPorts = GETNUMPORTS(portRange); 479 r->lport = r->pport; 480 } 481 r->pport_cnt = GETNUMPORTS(portRange); 482 (*av)++; (*ac)--; 483 484 /* 485 * Extract remote address and optionally port. 486 */ 487 /* 488 * NB: isdigit(**av) => we've to check that next parameter is really an 489 * option for this redirect entry, else stop here processing arg[cv]. 490 */ 491 if (*ac != 0 && isdigit(***av)) { 492 if (strchr(**av, ':') != NULL) { 493 if (StrToAddrAndPortRange(**av, &r->raddr, protoName, 494 &portRange) != 0) 495 errx(EX_DATAERR, "redirect_port: " 496 "invalid remote port range"); 497 } else { 498 SETLOPORT(portRange, 0); 499 SETNUMPORTS(portRange, 1); 500 StrToAddr(**av, &r->raddr); 501 } 502 (*av)++; (*ac)--; 503 } else { 504 SETLOPORT(portRange, 0); 505 SETNUMPORTS(portRange, 1); 506 r->raddr.s_addr = INADDR_ANY; 507 } 508 r->rport = GETLOPORT(portRange); 509 r->rport_cnt = GETNUMPORTS(portRange); 510 511 /* 512 * Make sure port ranges match up, then add the redirect ports. 513 */ 514 if (numLocalPorts != r->pport_cnt) 515 errx(EX_DATAERR, "redirect_port: " 516 "port ranges must be equal in size"); 517 518 /* Remote port range is allowed to be '0' which means all ports. */ 519 if (r->rport_cnt != numLocalPorts && 520 (r->rport_cnt != 1 || r->rport != 0)) 521 errx(EX_DATAERR, "redirect_port: remote port must" 522 "be 0 or equal to local port range in size"); 523 524 /* Setup LSNAT server pool. */ 525 if (lsnat != NULL) { 526 struct nat44_cfg_spool *spool; 527 528 sep = strtok(lsnat, ","); 529 while (sep != NULL) { 530 spool = (struct nat44_cfg_spool *)buf; 531 space += sizeof(struct nat44_cfg_spool); 532 /* 533 * The sctp nat does not allow the port numbers to 534 * be mapped to new port numbers. Therefore, no ports 535 * are to be specified in the target port field. 536 */ 537 if (r->proto == IPPROTO_SCTP) { 538 if (strchr (sep, ':')) { 539 errx(EX_DATAERR, "redirect_port:" 540 "port numbers do not change in " 541 "sctp, so do not specify them as " 542 "part of the target"); 543 } else { 544 StrToAddr(sep, &spool->addr); 545 spool->port = r->pport; 546 } 547 } else { 548 if (StrToAddrAndPortRange(sep, &spool->addr, 549 protoName, &portRange) != 0) 550 errx(EX_DATAERR, "redirect_port:" 551 "invalid local port range"); 552 if (GETNUMPORTS(portRange) != 1) 553 errx(EX_DATAERR, "redirect_port: " 554 "local port must be single in " 555 "this context"); 556 spool->port = GETLOPORT(portRange); 557 } 558 r->spool_cnt++; 559 /* Point to the next possible nat44_cfg_spool. */ 560 buf = &buf[sizeof(struct nat44_cfg_spool)]; 561 sep = strtok(NULL, ","); 562 } 563 } 564 565 return (space); 566 } 567 568 static int 569 setup_redir_proto(char *buf, int *ac, char ***av) 570 { 571 struct nat44_cfg_redir *r; 572 struct protoent *protoent; 573 size_t space; 574 575 r = (struct nat44_cfg_redir *)buf; 576 r->mode = REDIR_PROTO; 577 /* Skip nat44_cfg_redir at beginning of buf. */ 578 buf = &buf[sizeof(struct nat44_cfg_redir)]; 579 space = sizeof(struct nat44_cfg_redir); 580 581 /* 582 * Extract protocol. 583 */ 584 protoent = getprotobyname(**av); 585 if (protoent == NULL) 586 errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av); 587 else 588 r->proto = protoent->p_proto; 589 590 (*av)++; (*ac)--; 591 592 /* 593 * Extract local address. 594 */ 595 StrToAddr(**av, &r->laddr); 596 597 (*av)++; (*ac)--; 598 599 /* 600 * Extract optional public address. 601 */ 602 if (*ac == 0) { 603 r->paddr.s_addr = INADDR_ANY; 604 r->raddr.s_addr = INADDR_ANY; 605 } else { 606 /* see above in setup_redir_port() */ 607 if (isdigit(***av)) { 608 StrToAddr(**av, &r->paddr); 609 (*av)++; (*ac)--; 610 611 /* 612 * Extract optional remote address. 613 */ 614 /* see above in setup_redir_port() */ 615 if (*ac != 0 && isdigit(***av)) { 616 StrToAddr(**av, &r->raddr); 617 (*av)++; (*ac)--; 618 } 619 } 620 } 621 622 return (space); 623 } 624 625 static void 626 nat_show_log(struct nat44_cfg_nat *n, void *arg __unused) 627 { 628 char *buf; 629 630 buf = (char *)(n + 1); 631 if (buf[0] != '\0') 632 printf("nat %s: %s\n", n->name, buf); 633 } 634 635 static void 636 nat_show_cfg(struct nat44_cfg_nat *n, void *arg __unused) 637 { 638 struct nat44_cfg_redir *t; 639 struct nat44_cfg_spool *s; 640 caddr_t buf; 641 struct protoent *p; 642 uint32_t cnt; 643 int i, off; 644 645 buf = (caddr_t)n; 646 off = sizeof(*n); 647 printf("ipfw nat %s config", n->name); 648 if (strlen(n->if_name) != 0) 649 printf(" if %s", n->if_name); 650 else if (n->ip.s_addr != 0) 651 printf(" ip %s", inet_ntoa(n->ip)); 652 while (n->mode != 0) { 653 if (n->mode & PKT_ALIAS_LOG) { 654 printf(" log"); 655 n->mode &= ~PKT_ALIAS_LOG; 656 } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { 657 printf(" deny_in"); 658 n->mode &= ~PKT_ALIAS_DENY_INCOMING; 659 } else if (n->mode & PKT_ALIAS_SAME_PORTS) { 660 printf(" same_ports"); 661 n->mode &= ~PKT_ALIAS_SAME_PORTS; 662 } else if (n->mode & PKT_ALIAS_SKIP_GLOBAL) { 663 printf(" skip_global"); 664 n->mode &= ~PKT_ALIAS_SKIP_GLOBAL; 665 } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { 666 printf(" unreg_only"); 667 n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; 668 } else if (n->mode & PKT_ALIAS_UNREGISTERED_CGN) { 669 printf(" unreg_cgn"); 670 n->mode &= ~PKT_ALIAS_UNREGISTERED_CGN; 671 } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { 672 printf(" reset"); 673 n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; 674 } else if (n->mode & PKT_ALIAS_REVERSE) { 675 printf(" reverse"); 676 n->mode &= ~PKT_ALIAS_REVERSE; 677 } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { 678 printf(" proxy_only"); 679 n->mode &= ~PKT_ALIAS_PROXY_ONLY; 680 } else if (n->mode & PKT_ALIAS_UDP_EIM) { 681 printf(" udp_eim"); 682 n->mode &= ~PKT_ALIAS_UDP_EIM; 683 } 684 } 685 /* Print all the redirect's data configuration. */ 686 for (cnt = 0; cnt < n->redir_cnt; cnt++) { 687 t = (struct nat44_cfg_redir *)&buf[off]; 688 off += sizeof(struct nat44_cfg_redir); 689 switch (t->mode) { 690 case REDIR_ADDR: 691 printf(" redirect_addr"); 692 if (t->spool_cnt == 0) 693 printf(" %s", inet_ntoa(t->laddr)); 694 else 695 for (i = 0; i < t->spool_cnt; i++) { 696 s = (struct nat44_cfg_spool *)&buf[off]; 697 if (i) 698 printf(","); 699 else 700 printf(" "); 701 printf("%s", inet_ntoa(s->addr)); 702 off += sizeof(struct nat44_cfg_spool); 703 } 704 printf(" %s", inet_ntoa(t->paddr)); 705 break; 706 case REDIR_PORT: 707 p = getprotobynumber(t->proto); 708 printf(" redirect_port %s ", p->p_name); 709 if (!t->spool_cnt) { 710 printf("%s:%u", inet_ntoa(t->laddr), t->lport); 711 if (t->pport_cnt > 1) 712 printf("-%u", t->lport + 713 t->pport_cnt - 1); 714 } else 715 for (i=0; i < t->spool_cnt; i++) { 716 s = (struct nat44_cfg_spool *)&buf[off]; 717 if (i) 718 printf(","); 719 printf("%s:%u", inet_ntoa(s->addr), 720 s->port); 721 off += sizeof(struct nat44_cfg_spool); 722 } 723 724 printf(" "); 725 if (t->paddr.s_addr) 726 printf("%s:", inet_ntoa(t->paddr)); 727 printf("%u", t->pport); 728 if (!t->spool_cnt && t->pport_cnt > 1) 729 printf("-%u", t->pport + t->pport_cnt - 1); 730 731 if (t->raddr.s_addr) { 732 printf(" %s", inet_ntoa(t->raddr)); 733 if (t->rport) { 734 printf(":%u", t->rport); 735 if (!t->spool_cnt && t->rport_cnt > 1) 736 printf("-%u", t->rport + 737 t->rport_cnt - 1); 738 } 739 } 740 break; 741 case REDIR_PROTO: 742 p = getprotobynumber(t->proto); 743 printf(" redirect_proto %s %s", p->p_name, 744 inet_ntoa(t->laddr)); 745 if (t->paddr.s_addr != 0) { 746 printf(" %s", inet_ntoa(t->paddr)); 747 if (t->raddr.s_addr) 748 printf(" %s", inet_ntoa(t->raddr)); 749 } 750 break; 751 default: 752 errx(EX_DATAERR, "unknown redir mode"); 753 break; 754 } 755 } 756 printf("\n"); 757 } 758 759 static int 760 nat_port_alias_parse(char *str, u_short *lpout, u_short *hpout) { 761 long lp, hp; 762 char *ptr; 763 /* Lower port parsing */ 764 lp = (long) strtol(str, &ptr, 10); 765 if (lp < 1024 || lp > 65535) 766 return 0; 767 if (!ptr || *ptr != '-') 768 return 0; 769 /* Upper port parsing */ 770 hp = (long) strtol(ptr, &ptr, 10); 771 if (hp < 1024 || hp > 65535) 772 return 0; 773 if (ptr) 774 return 0; 775 776 *lpout = (u_short) lp; 777 *hpout = (u_short) hp; 778 return 1; 779 } 780 781 void 782 ipfw_config_nat(int ac, char **av) 783 { 784 ipfw_obj_header *oh; 785 struct nat44_cfg_nat *n; /* Nat instance configuration. */ 786 int i, off, tok, ac1; 787 u_short lp, hp; 788 char *id, *buf, **av1, *end; 789 size_t len; 790 791 av++; 792 ac--; 793 /* Nat id. */ 794 if (ac == 0) 795 errx(EX_DATAERR, "missing nat id"); 796 id = *av; 797 i = (int)strtol(id, &end, 0); 798 if (i <= 0 || *end != '\0') 799 errx(EX_DATAERR, "illegal nat id: %s", id); 800 av++; 801 ac--; 802 if (ac == 0) 803 errx(EX_DATAERR, "missing option"); 804 805 len = sizeof(*oh) + sizeof(*n); 806 ac1 = ac; 807 av1 = av; 808 while (ac1 > 0) { 809 tok = match_token(nat_params, *av1); 810 ac1--; 811 av1++; 812 switch (tok) { 813 case TOK_IP: 814 case TOK_IF: 815 case TOK_PORT_ALIAS: 816 ac1--; 817 av1++; 818 break; 819 case TOK_ALOG: 820 case TOK_DENY_INC: 821 case TOK_SAME_PORTS: 822 case TOK_SKIP_GLOBAL: 823 case TOK_UNREG_ONLY: 824 case TOK_UNREG_CGN: 825 case TOK_RESET_ADDR: 826 case TOK_ALIAS_REV: 827 case TOK_PROXY_ONLY: 828 case TOK_UDP_EIM: 829 break; 830 case TOK_REDIR_ADDR: 831 if (ac1 < 2) 832 errx(EX_DATAERR, "redirect_addr: " 833 "not enough arguments"); 834 len += estimate_redir_addr(&ac1, &av1); 835 av1 += 2; 836 ac1 -= 2; 837 break; 838 case TOK_REDIR_PORT: 839 if (ac1 < 3) 840 errx(EX_DATAERR, "redirect_port: " 841 "not enough arguments"); 842 av1++; 843 ac1--; 844 len += estimate_redir_port(&ac1, &av1); 845 av1 += 2; 846 ac1 -= 2; 847 /* Skip optional remoteIP/port */ 848 if (ac1 != 0 && isdigit(**av1)) { 849 av1++; 850 ac1--; 851 } 852 break; 853 case TOK_REDIR_PROTO: 854 if (ac1 < 2) 855 errx(EX_DATAERR, "redirect_proto: " 856 "not enough arguments"); 857 len += sizeof(struct nat44_cfg_redir); 858 av1 += 2; 859 ac1 -= 2; 860 /* Skip optional remoteIP/port */ 861 if (ac1 != 0 && isdigit(**av1)) { 862 av1++; 863 ac1--; 864 } 865 if (ac1 != 0 && isdigit(**av1)) { 866 av1++; 867 ac1--; 868 } 869 break; 870 default: 871 errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]); 872 } 873 } 874 875 if ((buf = malloc(len)) == NULL) 876 errx(EX_OSERR, "malloc failed"); 877 878 /* Offset in buf: save space for header at the beginning. */ 879 off = sizeof(*oh) + sizeof(*n); 880 memset(buf, 0, len); 881 oh = (ipfw_obj_header *)buf; 882 n = (struct nat44_cfg_nat *)(oh + 1); 883 oh->ntlv.head.length = sizeof(oh->ntlv); 884 snprintf(oh->ntlv.name, sizeof(oh->ntlv.name), "%d", i); 885 snprintf(n->name, sizeof(n->name), "%d", i); 886 887 while (ac > 0) { 888 tok = match_token(nat_params, *av); 889 ac--; 890 av++; 891 switch (tok) { 892 case TOK_IP: 893 if (ac == 0) 894 errx(EX_DATAERR, "missing option"); 895 if (!inet_aton(av[0], &(n->ip))) 896 errx(EX_DATAERR, "bad ip address ``%s''", 897 av[0]); 898 ac--; 899 av++; 900 break; 901 case TOK_IF: 902 if (ac == 0) 903 errx(EX_DATAERR, "missing option"); 904 set_addr_dynamic(av[0], n); 905 ac--; 906 av++; 907 break; 908 case TOK_ALOG: 909 n->mode |= PKT_ALIAS_LOG; 910 break; 911 case TOK_DENY_INC: 912 n->mode |= PKT_ALIAS_DENY_INCOMING; 913 break; 914 case TOK_SAME_PORTS: 915 n->mode |= PKT_ALIAS_SAME_PORTS; 916 break; 917 case TOK_UNREG_ONLY: 918 n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; 919 break; 920 case TOK_UNREG_CGN: 921 n->mode |= PKT_ALIAS_UNREGISTERED_CGN; 922 break; 923 case TOK_SKIP_GLOBAL: 924 n->mode |= PKT_ALIAS_SKIP_GLOBAL; 925 break; 926 case TOK_RESET_ADDR: 927 n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; 928 break; 929 case TOK_ALIAS_REV: 930 n->mode |= PKT_ALIAS_REVERSE; 931 break; 932 case TOK_PROXY_ONLY: 933 n->mode |= PKT_ALIAS_PROXY_ONLY; 934 break; 935 case TOK_UDP_EIM: 936 n->mode |= PKT_ALIAS_UDP_EIM; 937 break; 938 /* 939 * All the setup_redir_* functions work directly in 940 * the final buffer, see above for details. 941 */ 942 case TOK_REDIR_ADDR: 943 case TOK_REDIR_PORT: 944 case TOK_REDIR_PROTO: 945 switch (tok) { 946 case TOK_REDIR_ADDR: 947 i = setup_redir_addr(&buf[off], &ac, &av); 948 break; 949 case TOK_REDIR_PORT: 950 i = setup_redir_port(&buf[off], &ac, &av); 951 break; 952 case TOK_REDIR_PROTO: 953 i = setup_redir_proto(&buf[off], &ac, &av); 954 break; 955 } 956 n->redir_cnt++; 957 off += i; 958 break; 959 case TOK_PORT_ALIAS: 960 if (ac == 0) 961 errx(EX_DATAERR, "missing option"); 962 if (!nat_port_alias_parse(av[0], &lp, &hp)) 963 errx(EX_DATAERR, 964 "You need a range of port(s) from 1024 <= x < 65536"); 965 if (lp >= hp) 966 errx(EX_DATAERR, 967 "Upper port has to be greater than lower port"); 968 n->alias_port_lo = lp; 969 n->alias_port_hi = hp; 970 ac--; 971 av++; 972 break; 973 } 974 } 975 if (n->mode & PKT_ALIAS_SAME_PORTS && n->alias_port_lo) 976 errx(EX_DATAERR, "same_ports and port_range cannot both be selected"); 977 978 i = do_set3(IP_FW_NAT44_XCONFIG, &oh->opheader, len); 979 if (i != 0) 980 err(1, "setsockopt(%s)", "IP_FW_NAT44_XCONFIG"); 981 982 if (!g_co.do_quiet) { 983 /* After every modification, we show the resultant rule. */ 984 int _ac = 3; 985 const char *_av[] = {"show", "config", id}; 986 ipfw_show_nat(_ac, (char **)(void *)_av); 987 } 988 } 989 990 static void 991 nat_fill_ntlv(ipfw_obj_ntlv *ntlv, int i) 992 { 993 994 ntlv->head.type = IPFW_TLV_EACTION_NAME(1); /* it doesn't matter */ 995 ntlv->head.length = sizeof(ipfw_obj_ntlv); 996 ntlv->idx = 1; 997 ntlv->set = 0; /* not yet */ 998 snprintf(ntlv->name, sizeof(ntlv->name), "%d", i); 999 } 1000 1001 int 1002 ipfw_delete_nat(int i) 1003 { 1004 ipfw_obj_header oh; 1005 int ret; 1006 1007 memset(&oh, 0, sizeof(oh)); 1008 nat_fill_ntlv(&oh.ntlv, i); 1009 ret = do_set3(IP_FW_NAT44_DESTROY, &oh.opheader, sizeof(oh)); 1010 if (ret == -1) { 1011 if (!g_co.do_quiet) 1012 warn("nat %u not available", i); 1013 return (EX_UNAVAILABLE); 1014 } 1015 return (EX_OK); 1016 } 1017 1018 struct nat_list_arg { 1019 uint16_t cmd; 1020 int is_all; 1021 }; 1022 1023 static int 1024 nat_show_data(struct nat44_cfg_nat *cfg, void *arg) 1025 { 1026 struct nat_list_arg *nla; 1027 ipfw_obj_header *oh; 1028 1029 nla = (struct nat_list_arg *)arg; 1030 1031 switch (nla->cmd) { 1032 case IP_FW_NAT44_XGETCONFIG: 1033 if (nat_get_cmd(cfg->name, nla->cmd, &oh) != 0) { 1034 warnx("Error getting nat instance %s info", cfg->name); 1035 break; 1036 } 1037 nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL); 1038 free(oh); 1039 break; 1040 case IP_FW_NAT44_XGETLOG: 1041 if (nat_get_cmd(cfg->name, nla->cmd, &oh) == 0) { 1042 nat_show_log((struct nat44_cfg_nat *)(oh + 1), NULL); 1043 free(oh); 1044 break; 1045 } 1046 /* Handle error */ 1047 if (nla->is_all != 0 && errno == ENOENT) 1048 break; 1049 warn("Error getting nat instance %s info", cfg->name); 1050 break; 1051 } 1052 1053 return (0); 1054 } 1055 1056 /* 1057 * Compare nat names. 1058 * Honor number comparison. 1059 */ 1060 static int 1061 natname_cmp(const void *a, const void *b) 1062 { 1063 const struct nat44_cfg_nat *ia, *ib; 1064 1065 ia = (const struct nat44_cfg_nat *)a; 1066 ib = (const struct nat44_cfg_nat *)b; 1067 1068 return (stringnum_cmp(ia->name, ib->name)); 1069 } 1070 1071 /* 1072 * Retrieves nat list from kernel, 1073 * optionally sorts it and calls requested function for each table. 1074 * Returns 0 on success. 1075 */ 1076 static int 1077 nat_foreach(nat_cb_t *f, void *arg, int sort) 1078 { 1079 ipfw_obj_lheader *olh; 1080 struct nat44_cfg_nat *cfg; 1081 size_t sz; 1082 uint32_t i; 1083 1084 /* Start with reasonable default */ 1085 sz = sizeof(*olh) + 16 * sizeof(struct nat44_cfg_nat); 1086 1087 for (;;) { 1088 if ((olh = calloc(1, sz)) == NULL) 1089 return (ENOMEM); 1090 1091 olh->size = sz; 1092 if (do_get3(IP_FW_NAT44_LIST_NAT, &olh->opheader, &sz) != 0) { 1093 sz = olh->size; 1094 free(olh); 1095 if (errno == ENOMEM) 1096 continue; 1097 return (errno); 1098 } 1099 1100 if (sort != 0) 1101 qsort(olh + 1, olh->count, olh->objsize, natname_cmp); 1102 1103 cfg = (struct nat44_cfg_nat*)(olh + 1); 1104 for (i = 0; i < olh->count; i++) { 1105 (void)f(cfg, arg); /* Ignore errors for now */ 1106 cfg = (struct nat44_cfg_nat *)((caddr_t)cfg + 1107 olh->objsize); 1108 } 1109 1110 free(olh); 1111 break; 1112 } 1113 1114 return (0); 1115 } 1116 1117 static int 1118 nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh) 1119 { 1120 ipfw_obj_header *oh; 1121 struct nat44_cfg_nat *cfg; 1122 size_t sz; 1123 1124 /* Start with reasonable default */ 1125 sz = sizeof(*oh) + sizeof(*cfg) + 128; 1126 1127 for (;;) { 1128 if ((oh = calloc(1, sz)) == NULL) 1129 return (ENOMEM); 1130 cfg = (struct nat44_cfg_nat *)(oh + 1); 1131 oh->ntlv.head.length = sizeof(oh->ntlv); 1132 strlcpy(oh->ntlv.name, name, sizeof(oh->ntlv.name)); 1133 strlcpy(cfg->name, name, sizeof(cfg->name)); 1134 1135 if (do_get3(cmd, &oh->opheader, &sz) != 0) { 1136 sz = cfg->size; 1137 free(oh); 1138 if (errno == ENOMEM) 1139 continue; 1140 return (errno); 1141 } 1142 1143 *ooh = oh; 1144 break; 1145 } 1146 1147 return (0); 1148 } 1149 1150 void 1151 ipfw_show_nat(int ac, char **av) 1152 { 1153 ipfw_obj_header *oh; 1154 char *name; 1155 int cmd; 1156 struct nat_list_arg nla; 1157 1158 ac--; 1159 av++; 1160 1161 if (g_co.test_only) 1162 return; 1163 1164 /* Parse parameters. */ 1165 cmd = 0; /* XXX: Change to IP_FW_NAT44_XGETLOG @ MFC */ 1166 name = NULL; 1167 for ( ; ac != 0; ac--, av++) { 1168 if (!strncmp(av[0], "config", strlen(av[0]))) { 1169 cmd = IP_FW_NAT44_XGETCONFIG; 1170 continue; 1171 } 1172 if (strcmp(av[0], "log") == 0) { 1173 cmd = IP_FW_NAT44_XGETLOG; 1174 continue; 1175 } 1176 if (name != NULL) 1177 err(EX_USAGE,"only one instance name may be specified"); 1178 name = av[0]; 1179 } 1180 1181 if (cmd == 0) 1182 errx(EX_USAGE, "Please specify action. Available: config,log"); 1183 1184 if (name == NULL) { 1185 memset(&nla, 0, sizeof(nla)); 1186 nla.cmd = cmd; 1187 nla.is_all = 1; 1188 nat_foreach(nat_show_data, &nla, 1); 1189 } else { 1190 if (nat_get_cmd(name, cmd, &oh) != 0) 1191 err(EX_OSERR, "Error getting nat %s instance info", name); 1192 nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL); 1193 free(oh); 1194 } 1195 } 1196 1197