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