nat.c revision 220802
1243730Srwatson/* 2243730Srwatson * Copyright (c) 2002-2003 Luigi Rizzo 3243730Srwatson * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4243730Srwatson * Copyright (c) 1994 Ugen J.S.Antsilevich 5243730Srwatson * 6243730Srwatson * Idea and grammar partially left from: 7243730Srwatson * Copyright (c) 1993 Daniel Boulet 8243730Srwatson * 9243730Srwatson * Redistribution and use in source forms, with and without modification, 10243730Srwatson * are permitted provided that this entire comment appears intact. 11243730Srwatson * 12243730Srwatson * Redistribution in binary form may occur without any restrictions. 13243730Srwatson * Obviously, it would be nice if you gave credit where credit is due 14243730Srwatson * but requiring it would be too onerous. 15243730Srwatson * 16243730Srwatson * This software is provided ``AS IS'' without any warranties of any kind. 17243730Srwatson * 18243730Srwatson * NEW command line interface for IP firewall facility 19243730Srwatson * 20243730Srwatson * $FreeBSD: head/sbin/ipfw/nat.c 220802 2011-04-18 21:18:22Z glebius $ 21243730Srwatson * 22243730Srwatson * In-kernel nat support 23243730Srwatson */ 24243730Srwatson 25243730Srwatson#include <sys/types.h> 26243730Srwatson#include <sys/socket.h> 27243730Srwatson#include <sys/sysctl.h> 28243730Srwatson 29243730Srwatson#include "ipfw2.h" 30243730Srwatson 31243730Srwatson#include <ctype.h> 32243730Srwatson#include <err.h> 33243730Srwatson#include <netdb.h> 34243730Srwatson#include <stdio.h> 35243730Srwatson#include <stdlib.h> 36243730Srwatson#include <string.h> 37243730Srwatson#include <sysexits.h> 38243730Srwatson 39243730Srwatson#define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */ 40243730Srwatson 41243730Srwatson#include <net/if.h> 42243730Srwatson#include <net/if_dl.h> 43243734Srwatson#include <net/route.h> /* def. of struct route */ 44243730Srwatson#include <netinet/in.h> 45243730Srwatson#include <netinet/ip_fw.h> 46243730Srwatson#include <arpa/inet.h> 47243730Srwatson#include <alias.h> 48243730Srwatson 49243730Srwatsonstatic struct _s_x nat_params[] = { 50243730Srwatson { "ip", TOK_IP }, 51243730Srwatson { "if", TOK_IF }, 52243730Srwatson { "log", TOK_ALOG }, 53243730Srwatson { "deny_in", TOK_DENY_INC }, 54243730Srwatson { "same_ports", TOK_SAME_PORTS }, 55243730Srwatson { "unreg_only", TOK_UNREG_ONLY }, 56243730Srwatson { "reset", TOK_RESET_ADDR }, 57243730Srwatson { "reverse", TOK_ALIAS_REV }, 58243730Srwatson { "proxy_only", TOK_PROXY_ONLY }, 59243730Srwatson { "redirect_addr", TOK_REDIR_ADDR }, 60243730Srwatson { "redirect_port", TOK_REDIR_PORT }, 61243730Srwatson { "redirect_proto", TOK_REDIR_PROTO }, 62243730Srwatson { NULL, 0 } /* terminator */ 63243730Srwatson}; 64243730Srwatson 65243730Srwatson 66243730Srwatson/* 67243730Srwatson * Search for interface with name "ifn", and fill n accordingly: 68243730Srwatson * 69243730Srwatson * n->ip ip address of interface "ifn" 70243730Srwatson * n->if_name copy of interface name "ifn" 71243730Srwatson */ 72243730Srwatsonstatic void 73243730Srwatsonset_addr_dynamic(const char *ifn, struct cfg_nat *n) 74243730Srwatson{ 75243730Srwatson size_t needed; 76243730Srwatson int mib[6]; 77243730Srwatson char *buf, *lim, *next; 78243730Srwatson struct if_msghdr *ifm; 79243730Srwatson struct ifa_msghdr *ifam; 80243730Srwatson struct sockaddr_dl *sdl; 81243730Srwatson struct sockaddr_in *sin; 82243730Srwatson int ifIndex, ifMTU; 83243730Srwatson 84243730Srwatson mib[0] = CTL_NET; 85243730Srwatson mib[1] = PF_ROUTE; 86243730Srwatson mib[2] = 0; 87243730Srwatson mib[3] = AF_INET; 88243730Srwatson mib[4] = NET_RT_IFLIST; 89243730Srwatson mib[5] = 0; 90243730Srwatson/* 91 * Get interface data. 92 */ 93 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 94 err(1, "iflist-sysctl-estimate"); 95 buf = safe_calloc(1, needed); 96 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) 97 err(1, "iflist-sysctl-get"); 98 lim = buf + needed; 99/* 100 * Loop through interfaces until one with 101 * given name is found. This is done to 102 * find correct interface index for routing 103 * message processing. 104 */ 105 ifIndex = 0; 106 next = buf; 107 while (next < lim) { 108 ifm = (struct if_msghdr *)next; 109 next += ifm->ifm_msglen; 110 if (ifm->ifm_version != RTM_VERSION) { 111 if (co.verbose) 112 warnx("routing message version %d " 113 "not understood", ifm->ifm_version); 114 continue; 115 } 116 if (ifm->ifm_type == RTM_IFINFO) { 117 sdl = (struct sockaddr_dl *)(ifm + 1); 118 if (strlen(ifn) == sdl->sdl_nlen && 119 strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { 120 ifIndex = ifm->ifm_index; 121 ifMTU = ifm->ifm_data.ifi_mtu; 122 break; 123 } 124 } 125 } 126 if (!ifIndex) 127 errx(1, "unknown interface name %s", ifn); 128/* 129 * Get interface address. 130 */ 131 sin = NULL; 132 while (next < lim) { 133 ifam = (struct ifa_msghdr *)next; 134 next += ifam->ifam_msglen; 135 if (ifam->ifam_version != RTM_VERSION) { 136 if (co.verbose) 137 warnx("routing message version %d " 138 "not understood", ifam->ifam_version); 139 continue; 140 } 141 if (ifam->ifam_type != RTM_NEWADDR) 142 break; 143 if (ifam->ifam_addrs & RTA_IFA) { 144 int i; 145 char *cp = (char *)(ifam + 1); 146 147 for (i = 1; i < RTA_IFA; i <<= 1) { 148 if (ifam->ifam_addrs & i) 149 cp += SA_SIZE((struct sockaddr *)cp); 150 } 151 if (((struct sockaddr *)cp)->sa_family == AF_INET) { 152 sin = (struct sockaddr_in *)cp; 153 break; 154 } 155 } 156 } 157 if (sin == NULL) 158 errx(1, "%s: cannot get interface address", ifn); 159 160 n->ip = sin->sin_addr; 161 strncpy(n->if_name, ifn, IF_NAMESIZE); 162 163 free(buf); 164} 165 166/* 167 * XXX - The following functions, macros and definitions come from natd.c: 168 * it would be better to move them outside natd.c, in a file 169 * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live 170 * with it. 171 */ 172 173/* 174 * Definition of a port range, and macros to deal with values. 175 * FORMAT: HI 16-bits == first port in range, 0 == all ports. 176 * LO 16-bits == number of ports in range 177 * NOTES: - Port values are not stored in network byte order. 178 */ 179 180#define port_range u_long 181 182#define GETLOPORT(x) ((x) >> 0x10) 183#define GETNUMPORTS(x) ((x) & 0x0000ffff) 184#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) 185 186/* Set y to be the low-port value in port_range variable x. */ 187#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) 188 189/* Set y to be the number of ports in port_range variable x. */ 190#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) 191 192static void 193StrToAddr (const char* str, struct in_addr* addr) 194{ 195 struct hostent* hp; 196 197 if (inet_aton (str, addr)) 198 return; 199 200 hp = gethostbyname (str); 201 if (!hp) 202 errx (1, "unknown host %s", str); 203 204 memcpy (addr, hp->h_addr, sizeof (struct in_addr)); 205} 206 207static int 208StrToPortRange (const char* str, const char* proto, port_range *portRange) 209{ 210 char* sep; 211 struct servent* sp; 212 char* end; 213 u_short loPort; 214 u_short hiPort; 215 216 /* First see if this is a service, return corresponding port if so. */ 217 sp = getservbyname (str,proto); 218 if (sp) { 219 SETLOPORT(*portRange, ntohs(sp->s_port)); 220 SETNUMPORTS(*portRange, 1); 221 return 0; 222 } 223 224 /* Not a service, see if it's a single port or port range. */ 225 sep = strchr (str, '-'); 226 if (sep == NULL) { 227 SETLOPORT(*portRange, strtol(str, &end, 10)); 228 if (end != str) { 229 /* Single port. */ 230 SETNUMPORTS(*portRange, 1); 231 return 0; 232 } 233 234 /* Error in port range field. */ 235 errx (EX_DATAERR, "%s/%s: unknown service", str, proto); 236 } 237 238 /* Port range, get the values and sanity check. */ 239 sscanf (str, "%hu-%hu", &loPort, &hiPort); 240 SETLOPORT(*portRange, loPort); 241 SETNUMPORTS(*portRange, 0); /* Error by default */ 242 if (loPort <= hiPort) 243 SETNUMPORTS(*portRange, hiPort - loPort + 1); 244 245 if (GETNUMPORTS(*portRange) == 0) 246 errx (EX_DATAERR, "invalid port range %s", str); 247 248 return 0; 249} 250 251static int 252StrToProto (const char* str) 253{ 254 if (!strcmp (str, "tcp")) 255 return IPPROTO_TCP; 256 257 if (!strcmp (str, "udp")) 258 return IPPROTO_UDP; 259 260 if (!strcmp (str, "sctp")) 261 return IPPROTO_SCTP; 262 errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str); 263} 264 265static int 266StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, 267 port_range *portRange) 268{ 269 char* ptr; 270 271 ptr = strchr (str, ':'); 272 if (!ptr) 273 errx (EX_DATAERR, "%s is missing port number", str); 274 275 *ptr = '\0'; 276 ++ptr; 277 278 StrToAddr (str, addr); 279 return StrToPortRange (ptr, proto, portRange); 280} 281 282/* End of stuff taken from natd.c. */ 283 284#define INC_ARGCV() do { \ 285 (*_av)++; \ 286 (*_ac)--; \ 287 av = *_av; \ 288 ac = *_ac; \ 289} while(0) 290 291/* 292 * The next 3 functions add support for the addr, port and proto redirect and 293 * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() 294 * and SetupProtoRedirect() from natd.c. 295 * 296 * Every setup_* function fills at least one redirect entry 297 * (struct cfg_redir) and zero or more server pool entry (struct cfg_spool) 298 * in buf. 299 * 300 * The format of data in buf is: 301 * 302 * cfg_nat cfg_redir cfg_spool ...... cfg_spool 303 * 304 * ------------------------------------- ------------ 305 * | | .....X ... | | | | ..... 306 * ------------------------------------- ...... ------------ 307 * ^ 308 * spool_cnt n=0 ...... n=(X-1) 309 * 310 * len points to the amount of available space in buf 311 * space counts the memory consumed by every function 312 * 313 * XXX - Every function get all the argv params so it 314 * has to check, in optional parameters, that the next 315 * args is a valid option for the redir entry and not 316 * another token. Only redir_port and redir_proto are 317 * affected by this. 318 */ 319 320static int 321setup_redir_addr(char *spool_buf, unsigned int len, 322 int *_ac, char ***_av) 323{ 324 char **av, *sep; /* Token separator. */ 325 /* Temporary buffer used to hold server pool ip's. */ 326 char tmp_spool_buf[NAT_BUF_LEN]; 327 int ac, space, lsnat; 328 struct cfg_redir *r; 329 struct cfg_spool *tmp; 330 331 av = *_av; 332 ac = *_ac; 333 space = 0; 334 lsnat = 0; 335 if (len >= SOF_REDIR) { 336 r = (struct cfg_redir *)spool_buf; 337 /* Skip cfg_redir at beginning of buf. */ 338 spool_buf = &spool_buf[SOF_REDIR]; 339 space = SOF_REDIR; 340 len -= SOF_REDIR; 341 } else 342 goto nospace; 343 r->mode = REDIR_ADDR; 344 /* Extract local address. */ 345 if (ac == 0) 346 errx(EX_DATAERR, "redirect_addr: missing local address"); 347 sep = strchr(*av, ','); 348 if (sep) { /* LSNAT redirection syntax. */ 349 r->laddr.s_addr = INADDR_NONE; 350 /* Preserve av, copy spool servers to tmp_spool_buf. */ 351 strncpy(tmp_spool_buf, *av, strlen(*av)+1); 352 lsnat = 1; 353 } else 354 StrToAddr(*av, &r->laddr); 355 INC_ARGCV(); 356 357 /* Extract public address. */ 358 if (ac == 0) 359 errx(EX_DATAERR, "redirect_addr: missing public address"); 360 StrToAddr(*av, &r->paddr); 361 INC_ARGCV(); 362 363 /* Setup LSNAT server pool. */ 364 if (sep) { 365 sep = strtok(tmp_spool_buf, ","); 366 while (sep != NULL) { 367 tmp = (struct cfg_spool *)spool_buf; 368 if (len < SOF_SPOOL) 369 goto nospace; 370 len -= SOF_SPOOL; 371 space += SOF_SPOOL; 372 StrToAddr(sep, &tmp->addr); 373 tmp->port = ~0; 374 r->spool_cnt++; 375 /* Point to the next possible cfg_spool. */ 376 spool_buf = &spool_buf[SOF_SPOOL]; 377 sep = strtok(NULL, ","); 378 } 379 } 380 return(space); 381nospace: 382 errx(EX_DATAERR, "redirect_addr: buf is too small\n"); 383} 384 385static int 386setup_redir_port(char *spool_buf, unsigned int len, 387 int *_ac, char ***_av) 388{ 389 char **av, *sep, *protoName; 390 char tmp_spool_buf[NAT_BUF_LEN]; 391 int ac, space, lsnat; 392 struct cfg_redir *r; 393 struct cfg_spool *tmp; 394 u_short numLocalPorts; 395 port_range portRange; 396 397 av = *_av; 398 ac = *_ac; 399 space = 0; 400 lsnat = 0; 401 numLocalPorts = 0; 402 403 if (len >= SOF_REDIR) { 404 r = (struct cfg_redir *)spool_buf; 405 /* Skip cfg_redir at beginning of buf. */ 406 spool_buf = &spool_buf[SOF_REDIR]; 407 space = SOF_REDIR; 408 len -= SOF_REDIR; 409 } else 410 goto nospace; 411 r->mode = REDIR_PORT; 412 /* 413 * Extract protocol. 414 */ 415 if (ac == 0) 416 errx (EX_DATAERR, "redirect_port: missing protocol"); 417 r->proto = StrToProto(*av); 418 protoName = *av; 419 INC_ARGCV(); 420 421 /* 422 * Extract local address. 423 */ 424 if (ac == 0) 425 errx (EX_DATAERR, "redirect_port: missing local address"); 426 427 sep = strchr(*av, ','); 428 /* LSNAT redirection syntax. */ 429 if (sep) { 430 r->laddr.s_addr = INADDR_NONE; 431 r->lport = ~0; 432 numLocalPorts = 1; 433 /* Preserve av, copy spool servers to tmp_spool_buf. */ 434 strncpy(tmp_spool_buf, *av, strlen(*av)+1); 435 lsnat = 1; 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 not " 446 "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 INC_ARGCV(); 460 461 /* 462 * Extract public port and optionally address. 463 */ 464 if (ac == 0) 465 errx (EX_DATAERR, "redirect_port: missing public port"); 466 467 sep = strchr (*av, ':'); 468 if (sep) { 469 if (StrToAddrAndPortRange (*av, &r->paddr, protoName, 470 &portRange) != 0) 471 errx(EX_DATAERR, "redirect_port:" 472 "invalid public port range"); 473 } else { 474 r->paddr.s_addr = INADDR_ANY; 475 if (StrToPortRange (*av, protoName, &portRange) != 0) 476 errx(EX_DATAERR, "redirect_port:" 477 "invalid public port range"); 478 } 479 480 r->pport = GETLOPORT(portRange); 481 if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */ 482 numLocalPorts = GETNUMPORTS(portRange); 483 r->lport = r->pport; 484 } 485 r->pport_cnt = GETNUMPORTS(portRange); 486 INC_ARGCV(); 487 488 /* 489 * Extract remote address and optionally port. 490 */ 491 /* 492 * NB: isalpha(**av) => we've to check that next parameter is really an 493 * option for this redirect entry, else stop here processing arg[cv]. 494 */ 495 if (ac != 0 && !isalpha(**av)) { 496 sep = strchr (*av, ':'); 497 if (sep) { 498 if (StrToAddrAndPortRange (*av, &r->raddr, protoName, 499 &portRange) != 0) 500 errx(EX_DATAERR, "redirect_port:" 501 "invalid remote port range"); 502 } else { 503 SETLOPORT(portRange, 0); 504 SETNUMPORTS(portRange, 1); 505 StrToAddr (*av, &r->raddr); 506 } 507 INC_ARGCV(); 508 } else { 509 SETLOPORT(portRange, 0); 510 SETNUMPORTS(portRange, 1); 511 r->raddr.s_addr = INADDR_ANY; 512 } 513 r->rport = GETLOPORT(portRange); 514 r->rport_cnt = GETNUMPORTS(portRange); 515 516 /* 517 * Make sure port ranges match up, then add the redirect ports. 518 */ 519 if (numLocalPorts != r->pport_cnt) 520 errx(EX_DATAERR, "redirect_port:" 521 "port ranges must be equal in size"); 522 523 /* Remote port range is allowed to be '0' which means all ports. */ 524 if (r->rport_cnt != numLocalPorts && 525 (r->rport_cnt != 1 || r->rport != 0)) 526 errx(EX_DATAERR, "redirect_port: remote port must" 527 "be 0 or equal to local port range in size"); 528 529 /* 530 * Setup LSNAT server pool. 531 */ 532 if (lsnat) { 533 sep = strtok(tmp_spool_buf, ","); 534 while (sep != NULL) { 535 tmp = (struct cfg_spool *)spool_buf; 536 if (len < SOF_SPOOL) 537 goto nospace; 538 len -= SOF_SPOOL; 539 space += SOF_SPOOL; 540 /* 541 * The sctp nat does not allow the port numbers to be mapped to new port numbers 542 * Therefore, no ports are to be specified in the target port field 543 */ 544 if (r->proto == IPPROTO_SCTP) { 545 if (strchr (sep, ':')) { 546 errx(EX_DATAERR, "redirect_port:" 547 "port numbers do not change in " 548 "sctp, so do not specify them as " 549 "part of the target"); 550 } else { 551 StrToAddr(sep, &tmp->addr); 552 tmp->port = r->pport; 553 } 554 } else { 555 if (StrToAddrAndPortRange(sep, &tmp->addr, 556 protoName, &portRange) != 0) 557 errx(EX_DATAERR, "redirect_port:" 558 "invalid local port range"); 559 if (GETNUMPORTS(portRange) != 1) 560 errx(EX_DATAERR, "redirect_port: " 561 "local port must be single in " 562 "this context"); 563 tmp->port = GETLOPORT(portRange); 564 } 565 r->spool_cnt++; 566 /* Point to the next possible cfg_spool. */ 567 spool_buf = &spool_buf[SOF_SPOOL]; 568 sep = strtok(NULL, ","); 569 } 570 } 571 return (space); 572nospace: 573 errx(EX_DATAERR, "redirect_port: buf is too small\n"); 574} 575 576static int 577setup_redir_proto(char *spool_buf, unsigned int len, 578 int *_ac, char ***_av) 579{ 580 char **av; 581 int ac, space; 582 struct protoent *protoent; 583 struct cfg_redir *r; 584 585 av = *_av; 586 ac = *_ac; 587 if (len >= SOF_REDIR) { 588 r = (struct cfg_redir *)spool_buf; 589 /* Skip cfg_redir at beginning of buf. */ 590 spool_buf = &spool_buf[SOF_REDIR]; 591 space = SOF_REDIR; 592 len -= SOF_REDIR; 593 } else 594 goto nospace; 595 r->mode = REDIR_PROTO; 596 /* 597 * Extract protocol. 598 */ 599 if (ac == 0) 600 errx(EX_DATAERR, "redirect_proto: missing protocol"); 601 602 protoent = getprotobyname(*av); 603 if (protoent == NULL) 604 errx(EX_DATAERR, "redirect_proto: unknown protocol %s", *av); 605 else 606 r->proto = protoent->p_proto; 607 608 INC_ARGCV(); 609 610 /* 611 * Extract local address. 612 */ 613 if (ac == 0) 614 errx(EX_DATAERR, "redirect_proto: missing local address"); 615 else 616 StrToAddr(*av, &r->laddr); 617 618 INC_ARGCV(); 619 620 /* 621 * Extract optional public address. 622 */ 623 if (ac == 0) { 624 r->paddr.s_addr = INADDR_ANY; 625 r->raddr.s_addr = INADDR_ANY; 626 } else { 627 /* see above in setup_redir_port() */ 628 if (!isalpha(**av)) { 629 StrToAddr(*av, &r->paddr); 630 INC_ARGCV(); 631 632 /* 633 * Extract optional remote address. 634 */ 635 /* see above in setup_redir_port() */ 636 if (ac!=0 && !isalpha(**av)) { 637 StrToAddr(*av, &r->raddr); 638 INC_ARGCV(); 639 } 640 } 641 } 642 return (space); 643nospace: 644 errx(EX_DATAERR, "redirect_proto: buf is too small\n"); 645} 646 647static void 648print_nat_config(unsigned char *buf) 649{ 650 struct cfg_nat *n; 651 int i, cnt, flag, off; 652 struct cfg_redir *t; 653 struct cfg_spool *s; 654 struct protoent *p; 655 656 n = (struct cfg_nat *)buf; 657 flag = 1; 658 off = sizeof(*n); 659 printf("ipfw nat %u config", n->id); 660 if (strlen(n->if_name) != 0) 661 printf(" if %s", n->if_name); 662 else if (n->ip.s_addr != 0) 663 printf(" ip %s", inet_ntoa(n->ip)); 664 while (n->mode != 0) { 665 if (n->mode & PKT_ALIAS_LOG) { 666 printf(" log"); 667 n->mode &= ~PKT_ALIAS_LOG; 668 } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { 669 printf(" deny_in"); 670 n->mode &= ~PKT_ALIAS_DENY_INCOMING; 671 } else if (n->mode & PKT_ALIAS_SAME_PORTS) { 672 printf(" same_ports"); 673 n->mode &= ~PKT_ALIAS_SAME_PORTS; 674 } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { 675 printf(" unreg_only"); 676 n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; 677 } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { 678 printf(" reset"); 679 n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; 680 } else if (n->mode & PKT_ALIAS_REVERSE) { 681 printf(" reverse"); 682 n->mode &= ~PKT_ALIAS_REVERSE; 683 } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { 684 printf(" proxy_only"); 685 n->mode &= ~PKT_ALIAS_PROXY_ONLY; 686 } 687 } 688 /* Print all the redirect's data configuration. */ 689 for (cnt = 0; cnt < n->redir_cnt; cnt++) { 690 t = (struct cfg_redir *)&buf[off]; 691 off += SOF_REDIR; 692 switch (t->mode) { 693 case REDIR_ADDR: 694 printf(" redirect_addr"); 695 if (t->spool_cnt == 0) 696 printf(" %s", inet_ntoa(t->laddr)); 697 else 698 for (i = 0; i < t->spool_cnt; i++) { 699 s = (struct cfg_spool *)&buf[off]; 700 if (i) 701 printf(","); 702 else 703 printf(" "); 704 printf("%s", inet_ntoa(s->addr)); 705 off += SOF_SPOOL; 706 } 707 printf(" %s", inet_ntoa(t->paddr)); 708 break; 709 case REDIR_PORT: 710 p = getprotobynumber(t->proto); 711 printf(" redirect_port %s ", p->p_name); 712 if (!t->spool_cnt) { 713 printf("%s:%u", inet_ntoa(t->laddr), t->lport); 714 if (t->pport_cnt > 1) 715 printf("-%u", t->lport + 716 t->pport_cnt - 1); 717 } else 718 for (i=0; i < t->spool_cnt; i++) { 719 s = (struct cfg_spool *)&buf[off]; 720 if (i) 721 printf(","); 722 printf("%s:%u", inet_ntoa(s->addr), 723 s->port); 724 off += SOF_SPOOL; 725 } 726 727 printf(" "); 728 if (t->paddr.s_addr) 729 printf("%s:", inet_ntoa(t->paddr)); 730 printf("%u", t->pport); 731 if (!t->spool_cnt && t->pport_cnt > 1) 732 printf("-%u", t->pport + t->pport_cnt - 1); 733 734 if (t->raddr.s_addr) { 735 printf(" %s", inet_ntoa(t->raddr)); 736 if (t->rport) { 737 printf(":%u", t->rport); 738 if (!t->spool_cnt && t->rport_cnt > 1) 739 printf("-%u", t->rport + 740 t->rport_cnt - 1); 741 } 742 } 743 break; 744 case REDIR_PROTO: 745 p = getprotobynumber(t->proto); 746 printf(" redirect_proto %s %s", p->p_name, 747 inet_ntoa(t->laddr)); 748 if (t->paddr.s_addr != 0) { 749 printf(" %s", inet_ntoa(t->paddr)); 750 if (t->raddr.s_addr) 751 printf(" %s", inet_ntoa(t->raddr)); 752 } 753 break; 754 default: 755 errx(EX_DATAERR, "unknown redir mode"); 756 break; 757 } 758 } 759 printf("\n"); 760} 761 762void 763ipfw_config_nat(int ac, char **av) 764{ 765 struct cfg_nat *n; /* Nat instance configuration. */ 766 int i, len, off, tok; 767 char *id, buf[NAT_BUF_LEN]; /* Buffer for serialized data. */ 768 769 len = NAT_BUF_LEN; 770 /* Offset in buf: save space for n at the beginning. */ 771 off = sizeof(*n); 772 memset(buf, 0, sizeof(buf)); 773 n = (struct cfg_nat *)buf; 774 775 av++; ac--; 776 /* Nat id. */ 777 if (ac && isdigit(**av)) { 778 id = *av; 779 i = atoi(*av); 780 ac--; av++; 781 n->id = i; 782 } else 783 errx(EX_DATAERR, "missing nat id"); 784 if (ac == 0) 785 errx(EX_DATAERR, "missing option"); 786 787 while (ac > 0) { 788 tok = match_token(nat_params, *av); 789 ac--; av++; 790 switch (tok) { 791 case TOK_IP: 792 if (ac == 0) 793 errx(EX_DATAERR, "missing option"); 794 if (!inet_aton(av[0], &(n->ip))) 795 errx(EX_DATAERR, "bad ip address ``%s''", 796 av[0]); 797 ac--; av++; 798 break; 799 case TOK_IF: 800 if (ac == 0) 801 errx(EX_DATAERR, "missing option"); 802 set_addr_dynamic(av[0], n); 803 ac--; av++; 804 break; 805 case TOK_ALOG: 806 n->mode |= PKT_ALIAS_LOG; 807 break; 808 case TOK_DENY_INC: 809 n->mode |= PKT_ALIAS_DENY_INCOMING; 810 break; 811 case TOK_SAME_PORTS: 812 n->mode |= PKT_ALIAS_SAME_PORTS; 813 break; 814 case TOK_UNREG_ONLY: 815 n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; 816 break; 817 case TOK_RESET_ADDR: 818 n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; 819 break; 820 case TOK_ALIAS_REV: 821 n->mode |= PKT_ALIAS_REVERSE; 822 break; 823 case TOK_PROXY_ONLY: 824 n->mode |= PKT_ALIAS_PROXY_ONLY; 825 break; 826 /* 827 * All the setup_redir_* functions work directly in 828 * the final buffer, see above for details. 829 */ 830 case TOK_REDIR_ADDR: 831 case TOK_REDIR_PORT: 832 case TOK_REDIR_PROTO: 833 switch (tok) { 834 case TOK_REDIR_ADDR: 835 i = setup_redir_addr(&buf[off], len, &ac, &av); 836 break; 837 case TOK_REDIR_PORT: 838 i = setup_redir_port(&buf[off], len, &ac, &av); 839 break; 840 case TOK_REDIR_PROTO: 841 i = setup_redir_proto(&buf[off], len, &ac, &av); 842 break; 843 } 844 n->redir_cnt++; 845 off += i; 846 len -= i; 847 break; 848 default: 849 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 850 } 851 } 852 853 i = do_cmd(IP_FW_NAT_CFG, buf, off); 854 if (i) 855 err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); 856 857 if (!co.do_quiet) { 858 /* After every modification, we show the resultant rule. */ 859 int _ac = 3; 860 const char *_av[] = {"show", "config", id}; 861 ipfw_show_nat(_ac, (char **)(void *)_av); 862 } 863} 864 865 866void 867ipfw_show_nat(int ac, char **av) 868{ 869 struct cfg_nat *n; 870 struct cfg_redir *e; 871 int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; 872 int nat_cnt, redir_cnt, r; 873 uint8_t *data, *p; 874 char *endptr; 875 876 do_rule = 0; 877 nalloc = 1024; 878 size = 0; 879 data = NULL; 880 frule = 0; 881 lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */ 882 ac--; av++; 883 884 if (co.test_only) 885 return; 886 887 /* Parse parameters. */ 888 for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { 889 if (!strncmp(av[0], "config", strlen(av[0]))) { 890 cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; 891 continue; 892 } 893 /* Convert command line rule #. */ 894 frule = lrule = strtoul(av[0], &endptr, 10); 895 if (*endptr == '-') 896 lrule = strtoul(endptr+1, &endptr, 10); 897 if (lrule == 0) 898 err(EX_USAGE, "invalid rule number: %s", av[0]); 899 do_rule = 1; 900 } 901 902 nbytes = nalloc; 903 while (nbytes >= nalloc) { 904 nalloc = nalloc * 2; 905 nbytes = nalloc; 906 data = safe_realloc(data, nbytes); 907 if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) 908 err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", 909 (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); 910 } 911 if (nbytes == 0) 912 exit(0); 913 if (do_cfg) { 914 nat_cnt = *((int *)data); 915 for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { 916 n = (struct cfg_nat *)&data[i]; 917 if (frule <= n->id && lrule >= n->id) 918 print_nat_config(&data[i]); 919 i += sizeof(struct cfg_nat); 920 for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) { 921 e = (struct cfg_redir *)&data[i]; 922 i += sizeof(struct cfg_redir) + e->spool_cnt * 923 sizeof(struct cfg_spool); 924 } 925 } 926 } else { 927 for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { 928 p = &data[i]; 929 if (p == data + nbytes) 930 break; 931 bcopy(p, &r, sizeof(int)); 932 if (do_rule) { 933 if (!(frule <= r && lrule >= r)) 934 continue; 935 } 936 printf("nat %u: %s\n", r, p+sizeof(int)); 937 } 938 } 939} 940