nat.c revision 223499
1187770Sluigi/* 2187770Sluigi * Copyright (c) 2002-2003 Luigi Rizzo 3187770Sluigi * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4187770Sluigi * Copyright (c) 1994 Ugen J.S.Antsilevich 5187770Sluigi * 6187770Sluigi * Idea and grammar partially left from: 7187770Sluigi * Copyright (c) 1993 Daniel Boulet 8187770Sluigi * 9187770Sluigi * Redistribution and use in source forms, with and without modification, 10187770Sluigi * are permitted provided that this entire comment appears intact. 11187770Sluigi * 12187770Sluigi * Redistribution in binary form may occur without any restrictions. 13187770Sluigi * Obviously, it would be nice if you gave credit where credit is due 14187770Sluigi * but requiring it would be too onerous. 15187770Sluigi * 16187770Sluigi * This software is provided ``AS IS'' without any warranties of any kind. 17187770Sluigi * 18187770Sluigi * NEW command line interface for IP firewall facility 19187770Sluigi * 20187770Sluigi * $FreeBSD: head/sbin/ipfw/nat.c 223499 2011-06-24 12:55:16Z glebius $ 21187770Sluigi * 22187770Sluigi * In-kernel nat support 23187770Sluigi */ 24187770Sluigi 25187770Sluigi#include <sys/types.h> 26187770Sluigi#include <sys/socket.h> 27187770Sluigi#include <sys/sysctl.h> 28187770Sluigi 29187770Sluigi#include "ipfw2.h" 30187770Sluigi 31187770Sluigi#include <ctype.h> 32187770Sluigi#include <err.h> 33187770Sluigi#include <netdb.h> 34187770Sluigi#include <stdio.h> 35187770Sluigi#include <stdlib.h> 36187770Sluigi#include <string.h> 37187770Sluigi#include <sysexits.h> 38187770Sluigi 39187770Sluigi#define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */ 40187770Sluigi 41187770Sluigi#include <net/if.h> 42187770Sluigi#include <net/if_dl.h> 43187770Sluigi#include <net/route.h> /* def. of struct route */ 44187770Sluigi#include <netinet/in.h> 45187770Sluigi#include <netinet/ip_fw.h> 46187770Sluigi#include <arpa/inet.h> 47187770Sluigi#include <alias.h> 48187770Sluigi 49187770Sluigistatic struct _s_x nat_params[] = { 50220802Sglebius { "ip", TOK_IP }, 51220802Sglebius { "if", TOK_IF }, 52220802Sglebius { "log", TOK_ALOG }, 53220802Sglebius { "deny_in", TOK_DENY_INC }, 54220802Sglebius { "same_ports", TOK_SAME_PORTS }, 55220802Sglebius { "unreg_only", TOK_UNREG_ONLY }, 56223080Sae { "skip_global", TOK_SKIP_GLOBAL }, 57220802Sglebius { "reset", TOK_RESET_ADDR }, 58220804Sglebius { "reverse", TOK_ALIAS_REV }, 59220802Sglebius { "proxy_only", TOK_PROXY_ONLY }, 60187770Sluigi { "redirect_addr", TOK_REDIR_ADDR }, 61187770Sluigi { "redirect_port", TOK_REDIR_PORT }, 62187770Sluigi { "redirect_proto", TOK_REDIR_PROTO }, 63187770Sluigi { NULL, 0 } /* terminator */ 64187770Sluigi}; 65187770Sluigi 66187770Sluigi 67220802Sglebius/* 68187770Sluigi * Search for interface with name "ifn", and fill n accordingly: 69187770Sluigi * 70220802Sglebius * n->ip ip address of interface "ifn" 71187770Sluigi * n->if_name copy of interface name "ifn" 72187770Sluigi */ 73187770Sluigistatic void 74187770Sluigiset_addr_dynamic(const char *ifn, struct cfg_nat *n) 75187770Sluigi{ 76187770Sluigi size_t needed; 77187770Sluigi int mib[6]; 78187770Sluigi char *buf, *lim, *next; 79187770Sluigi struct if_msghdr *ifm; 80187770Sluigi struct ifa_msghdr *ifam; 81187770Sluigi struct sockaddr_dl *sdl; 82187770Sluigi struct sockaddr_in *sin; 83187770Sluigi int ifIndex, ifMTU; 84187770Sluigi 85187770Sluigi mib[0] = CTL_NET; 86187770Sluigi mib[1] = PF_ROUTE; 87187770Sluigi mib[2] = 0; 88220804Sglebius mib[3] = AF_INET; 89187770Sluigi mib[4] = NET_RT_IFLIST; 90220804Sglebius mib[5] = 0; 91187770Sluigi/* 92187770Sluigi * Get interface data. 93187770Sluigi */ 94187770Sluigi if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 95187770Sluigi err(1, "iflist-sysctl-estimate"); 96187770Sluigi buf = safe_calloc(1, needed); 97187770Sluigi if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) 98187770Sluigi err(1, "iflist-sysctl-get"); 99187770Sluigi lim = buf + needed; 100187770Sluigi/* 101187770Sluigi * Loop through interfaces until one with 102187770Sluigi * given name is found. This is done to 103187770Sluigi * find correct interface index for routing 104187770Sluigi * message processing. 105187770Sluigi */ 106187770Sluigi ifIndex = 0; 107187770Sluigi next = buf; 108187770Sluigi while (next < lim) { 109187770Sluigi ifm = (struct if_msghdr *)next; 110187770Sluigi next += ifm->ifm_msglen; 111187770Sluigi if (ifm->ifm_version != RTM_VERSION) { 112187770Sluigi if (co.verbose) 113187770Sluigi warnx("routing message version %d " 114187770Sluigi "not understood", ifm->ifm_version); 115187770Sluigi continue; 116187770Sluigi } 117187770Sluigi if (ifm->ifm_type == RTM_IFINFO) { 118187770Sluigi sdl = (struct sockaddr_dl *)(ifm + 1); 119187770Sluigi if (strlen(ifn) == sdl->sdl_nlen && 120187770Sluigi strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { 121187770Sluigi ifIndex = ifm->ifm_index; 122187770Sluigi ifMTU = ifm->ifm_data.ifi_mtu; 123187770Sluigi break; 124187770Sluigi } 125187770Sluigi } 126187770Sluigi } 127187770Sluigi if (!ifIndex) 128187770Sluigi errx(1, "unknown interface name %s", ifn); 129187770Sluigi/* 130187770Sluigi * Get interface address. 131187770Sluigi */ 132187770Sluigi sin = NULL; 133187770Sluigi while (next < lim) { 134187770Sluigi ifam = (struct ifa_msghdr *)next; 135187770Sluigi next += ifam->ifam_msglen; 136187770Sluigi if (ifam->ifam_version != RTM_VERSION) { 137187770Sluigi if (co.verbose) 138187770Sluigi warnx("routing message version %d " 139187770Sluigi "not understood", ifam->ifam_version); 140187770Sluigi continue; 141187770Sluigi } 142187770Sluigi if (ifam->ifam_type != RTM_NEWADDR) 143187770Sluigi break; 144187770Sluigi if (ifam->ifam_addrs & RTA_IFA) { 145187770Sluigi int i; 146187770Sluigi char *cp = (char *)(ifam + 1); 147187770Sluigi 148187770Sluigi for (i = 1; i < RTA_IFA; i <<= 1) { 149187770Sluigi if (ifam->ifam_addrs & i) 150187770Sluigi cp += SA_SIZE((struct sockaddr *)cp); 151187770Sluigi } 152187770Sluigi if (((struct sockaddr *)cp)->sa_family == AF_INET) { 153187770Sluigi sin = (struct sockaddr_in *)cp; 154187770Sluigi break; 155187770Sluigi } 156187770Sluigi } 157187770Sluigi } 158187770Sluigi if (sin == NULL) 159187770Sluigi errx(1, "%s: cannot get interface address", ifn); 160187770Sluigi 161187770Sluigi n->ip = sin->sin_addr; 162187770Sluigi strncpy(n->if_name, ifn, IF_NAMESIZE); 163187770Sluigi 164187770Sluigi free(buf); 165187770Sluigi} 166187770Sluigi 167220802Sglebius/* 168187770Sluigi * XXX - The following functions, macros and definitions come from natd.c: 169220802Sglebius * it would be better to move them outside natd.c, in a file 170220802Sglebius * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live 171187770Sluigi * with it. 172187770Sluigi */ 173187770Sluigi 174187770Sluigi/* 175187770Sluigi * Definition of a port range, and macros to deal with values. 176187770Sluigi * FORMAT: HI 16-bits == first port in range, 0 == all ports. 177220802Sglebius * LO 16-bits == number of ports in range 178187770Sluigi * NOTES: - Port values are not stored in network byte order. 179187770Sluigi */ 180187770Sluigi 181187770Sluigi#define port_range u_long 182187770Sluigi 183220802Sglebius#define GETLOPORT(x) ((x) >> 0x10) 184220802Sglebius#define GETNUMPORTS(x) ((x) & 0x0000ffff) 185220802Sglebius#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) 186187770Sluigi 187187770Sluigi/* Set y to be the low-port value in port_range variable x. */ 188187770Sluigi#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) 189187770Sluigi 190187770Sluigi/* Set y to be the number of ports in port_range variable x. */ 191187770Sluigi#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) 192187770Sluigi 193220802Sglebiusstatic void 194187770SluigiStrToAddr (const char* str, struct in_addr* addr) 195187770Sluigi{ 196187770Sluigi struct hostent* hp; 197187770Sluigi 198187770Sluigi if (inet_aton (str, addr)) 199187770Sluigi return; 200187770Sluigi 201187770Sluigi hp = gethostbyname (str); 202187770Sluigi if (!hp) 203187770Sluigi errx (1, "unknown host %s", str); 204187770Sluigi 205187770Sluigi memcpy (addr, hp->h_addr, sizeof (struct in_addr)); 206187770Sluigi} 207187770Sluigi 208220802Sglebiusstatic int 209187770SluigiStrToPortRange (const char* str, const char* proto, port_range *portRange) 210187770Sluigi{ 211220802Sglebius char* sep; 212187770Sluigi struct servent* sp; 213187770Sluigi char* end; 214220802Sglebius u_short loPort; 215220802Sglebius u_short hiPort; 216220804Sglebius 217187770Sluigi /* First see if this is a service, return corresponding port if so. */ 218187770Sluigi sp = getservbyname (str,proto); 219187770Sluigi if (sp) { 220220802Sglebius SETLOPORT(*portRange, ntohs(sp->s_port)); 221187770Sluigi SETNUMPORTS(*portRange, 1); 222187770Sluigi return 0; 223187770Sluigi } 224220802Sglebius 225187770Sluigi /* Not a service, see if it's a single port or port range. */ 226187770Sluigi sep = strchr (str, '-'); 227187770Sluigi if (sep == NULL) { 228220802Sglebius SETLOPORT(*portRange, strtol(str, &end, 10)); 229187770Sluigi if (end != str) { 230220802Sglebius /* Single port. */ 231220802Sglebius SETNUMPORTS(*portRange, 1); 232187770Sluigi return 0; 233187770Sluigi } 234187770Sluigi 235187770Sluigi /* Error in port range field. */ 236187770Sluigi errx (EX_DATAERR, "%s/%s: unknown service", str, proto); 237187770Sluigi } 238187770Sluigi 239187770Sluigi /* Port range, get the values and sanity check. */ 240187770Sluigi sscanf (str, "%hu-%hu", &loPort, &hiPort); 241187770Sluigi SETLOPORT(*portRange, loPort); 242187770Sluigi SETNUMPORTS(*portRange, 0); /* Error by default */ 243187770Sluigi if (loPort <= hiPort) 244220802Sglebius SETNUMPORTS(*portRange, hiPort - loPort + 1); 245187770Sluigi 246187770Sluigi if (GETNUMPORTS(*portRange) == 0) 247220802Sglebius errx (EX_DATAERR, "invalid port range %s", str); 248187770Sluigi 249187770Sluigi return 0; 250187770Sluigi} 251187770Sluigi 252220802Sglebiusstatic int 253187770SluigiStrToProto (const char* str) 254187770Sluigi{ 255187770Sluigi if (!strcmp (str, "tcp")) 256187770Sluigi return IPPROTO_TCP; 257187770Sluigi 258187770Sluigi if (!strcmp (str, "udp")) 259187770Sluigi return IPPROTO_UDP; 260187770Sluigi 261188294Spiso if (!strcmp (str, "sctp")) 262188294Spiso return IPPROTO_SCTP; 263188294Spiso errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str); 264187770Sluigi} 265187770Sluigi 266220802Sglebiusstatic int 267220802SglebiusStrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, 268220802Sglebius port_range *portRange) 269187770Sluigi{ 270187770Sluigi char* ptr; 271187770Sluigi 272187770Sluigi ptr = strchr (str, ':'); 273187770Sluigi if (!ptr) 274187770Sluigi errx (EX_DATAERR, "%s is missing port number", str); 275187770Sluigi 276187770Sluigi *ptr = '\0'; 277187770Sluigi ++ptr; 278187770Sluigi 279187770Sluigi StrToAddr (str, addr); 280187770Sluigi return StrToPortRange (ptr, proto, portRange); 281187770Sluigi} 282187770Sluigi 283187770Sluigi/* End of stuff taken from natd.c. */ 284187770Sluigi 285220802Sglebius/* 286220802Sglebius * The next 3 functions add support for the addr, port and proto redirect and 287220802Sglebius * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() 288187770Sluigi * and SetupProtoRedirect() from natd.c. 289187770Sluigi * 290220802Sglebius * Every setup_* function fills at least one redirect entry 291220802Sglebius * (struct cfg_redir) and zero or more server pool entry (struct cfg_spool) 292187770Sluigi * in buf. 293220802Sglebius * 294187770Sluigi * The format of data in buf is: 295187770Sluigi * 296220802Sglebius * cfg_nat cfg_redir cfg_spool ...... cfg_spool 297187770Sluigi * 298187770Sluigi * ------------------------------------- ------------ 299187770Sluigi * | | .....X ... | | | | ..... 300187770Sluigi * ------------------------------------- ...... ------------ 301220802Sglebius * ^ 302187770Sluigi * spool_cnt n=0 ...... n=(X-1) 303187770Sluigi * 304187770Sluigi * len points to the amount of available space in buf 305187770Sluigi * space counts the memory consumed by every function 306187770Sluigi * 307220802Sglebius * XXX - Every function get all the argv params so it 308187770Sluigi * has to check, in optional parameters, that the next 309220802Sglebius * args is a valid option for the redir entry and not 310220802Sglebius * another token. Only redir_port and redir_proto are 311187770Sluigi * affected by this. 312187770Sluigi */ 313187770Sluigi 314187770Sluigistatic int 315220835Sglebiusestimate_redir_addr(int *ac, char ***av) 316187770Sluigi{ 317220835Sglebius size_t space = sizeof(struct cfg_redir); 318223185Sglebius char *sep = **av; 319223185Sglebius u_int c = 0; 320220835Sglebius 321223185Sglebius while ((sep = strchr(sep, ',')) != NULL) { 322223185Sglebius c++; 323223185Sglebius sep++; 324220835Sglebius } 325220835Sglebius 326223185Sglebius if (c > 0) 327223185Sglebius c++; 328223185Sglebius 329223185Sglebius space += c * sizeof(struct cfg_spool); 330223185Sglebius 331220835Sglebius return (space); 332220835Sglebius} 333220835Sglebius 334220835Sglebiusstatic int 335220835Sglebiussetup_redir_addr(char *buf, int *ac, char ***av) 336220835Sglebius{ 337220804Sglebius struct cfg_redir *r; 338220835Sglebius char *sep; 339220835Sglebius size_t space; 340187770Sluigi 341220835Sglebius r = (struct cfg_redir *)buf; 342187770Sluigi r->mode = REDIR_ADDR; 343220835Sglebius /* Skip cfg_redir at beginning of buf. */ 344220835Sglebius buf = &buf[sizeof(struct cfg_redir)]; 345220835Sglebius space = sizeof(struct cfg_redir); 346220835Sglebius 347187770Sluigi /* Extract local address. */ 348220835Sglebius if ((sep = strtok(**av, ",")) != NULL) { 349220835Sglebius struct cfg_spool *spool; 350220835Sglebius 351220835Sglebius /* Setup LSNAT server pool. */ 352187770Sluigi r->laddr.s_addr = INADDR_NONE; 353187770Sluigi while (sep != NULL) { 354220835Sglebius spool = (struct cfg_spool *)buf; 355220835Sglebius space += sizeof(struct cfg_spool); 356220835Sglebius StrToAddr(sep, &spool->addr); 357220835Sglebius spool->port = ~0; 358187770Sluigi r->spool_cnt++; 359187770Sluigi /* Point to the next possible cfg_spool. */ 360220835Sglebius buf = &buf[sizeof(struct cfg_spool)]; 361187770Sluigi sep = strtok(NULL, ","); 362187770Sluigi } 363220835Sglebius } else 364220835Sglebius StrToAddr(**av, &r->laddr); 365220835Sglebius (*av)++; (*ac)--; 366220835Sglebius 367220835Sglebius /* Extract public address. */ 368220835Sglebius StrToAddr(**av, &r->paddr); 369220835Sglebius (*av)++; (*ac)--; 370220835Sglebius 371220835Sglebius return (space); 372220835Sglebius} 373220835Sglebius 374220835Sglebiusstatic int 375220835Sglebiusestimate_redir_port(int *ac, char ***av) 376220835Sglebius{ 377220835Sglebius size_t space = sizeof(struct cfg_redir); 378223185Sglebius char *sep = **av; 379223185Sglebius u_int c = 0; 380220835Sglebius 381223185Sglebius while ((sep = strchr(sep, ',')) != NULL) { 382223185Sglebius c++; 383223185Sglebius sep++; 384187770Sluigi } 385220835Sglebius 386223185Sglebius if (c > 0) 387223185Sglebius c++; 388223185Sglebius 389223185Sglebius space += c * sizeof(struct cfg_spool); 390223185Sglebius 391220835Sglebius return (space); 392187770Sluigi} 393187770Sluigi 394187770Sluigistatic int 395220835Sglebiussetup_redir_port(char *buf, int *ac, char ***av) 396187770Sluigi{ 397187770Sluigi struct cfg_redir *r; 398220835Sglebius char *sep, *protoName, *lsnat = NULL; 399220835Sglebius size_t space; 400187770Sluigi u_short numLocalPorts; 401220804Sglebius port_range portRange; 402187770Sluigi 403220804Sglebius numLocalPorts = 0; 404187770Sluigi 405220835Sglebius r = (struct cfg_redir *)buf; 406187770Sluigi r->mode = REDIR_PORT; 407220835Sglebius /* Skip cfg_redir at beginning of buf. */ 408220835Sglebius buf = &buf[sizeof(struct cfg_redir)]; 409220835Sglebius space = sizeof(struct cfg_redir); 410220835Sglebius 411187770Sluigi /* 412187770Sluigi * Extract protocol. 413187770Sluigi */ 414220835Sglebius r->proto = StrToProto(**av); 415220835Sglebius protoName = **av; 416220835Sglebius (*av)++; (*ac)--; 417187770Sluigi 418187770Sluigi /* 419187770Sluigi * Extract local address. 420187770Sluigi */ 421220835Sglebius if ((sep = strchr(**av, ',')) != NULL) { 422187770Sluigi r->laddr.s_addr = INADDR_NONE; 423187770Sluigi r->lport = ~0; 424187770Sluigi numLocalPorts = 1; 425220835Sglebius lsnat = **av; 426187770Sluigi } else { 427188294Spiso /* 428220802Sglebius * The sctp nat does not allow the port numbers to be mapped to 429220802Sglebius * new port numbers. Therefore, no ports are to be specified 430188294Spiso * in the target port field. 431188294Spiso */ 432188294Spiso if (r->proto == IPPROTO_SCTP) { 433220835Sglebius if (strchr(**av, ':')) 434188294Spiso errx(EX_DATAERR, "redirect_port:" 435220835Sglebius "port numbers do not change in sctp, so do " 436220835Sglebius "not specify them as part of the target"); 437188294Spiso else 438220835Sglebius StrToAddr(**av, &r->laddr); 439188294Spiso } else { 440220835Sglebius if (StrToAddrAndPortRange(**av, &r->laddr, protoName, 441220835Sglebius &portRange) != 0) 442220835Sglebius errx(EX_DATAERR, "redirect_port: " 443188294Spiso "invalid local port range"); 444187770Sluigi 445188294Spiso r->lport = GETLOPORT(portRange); 446188294Spiso numLocalPorts = GETNUMPORTS(portRange); 447188294Spiso } 448187770Sluigi } 449220835Sglebius (*av)++; (*ac)--; 450187770Sluigi 451187770Sluigi /* 452187770Sluigi * Extract public port and optionally address. 453187770Sluigi */ 454220835Sglebius if ((sep = strchr(**av, ':')) != NULL) { 455220835Sglebius if (StrToAddrAndPortRange(**av, &r->paddr, protoName, 456187770Sluigi &portRange) != 0) 457220835Sglebius errx(EX_DATAERR, "redirect_port: " 458187770Sluigi "invalid public port range"); 459187770Sluigi } else { 460187770Sluigi r->paddr.s_addr = INADDR_ANY; 461220835Sglebius if (StrToPortRange(**av, protoName, &portRange) != 0) 462220835Sglebius errx(EX_DATAERR, "redirect_port: " 463187770Sluigi "invalid public port range"); 464187770Sluigi } 465187770Sluigi 466187770Sluigi r->pport = GETLOPORT(portRange); 467188294Spiso if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */ 468188294Spiso numLocalPorts = GETNUMPORTS(portRange); 469188294Spiso r->lport = r->pport; 470188294Spiso } 471187770Sluigi r->pport_cnt = GETNUMPORTS(portRange); 472220835Sglebius (*av)++; (*ac)--; 473187770Sluigi 474187770Sluigi /* 475187770Sluigi * Extract remote address and optionally port. 476220804Sglebius */ 477220802Sglebius /* 478223185Sglebius * NB: isdigit(**av) => we've to check that next parameter is really an 479187770Sluigi * option for this redirect entry, else stop here processing arg[cv]. 480187770Sluigi */ 481223185Sglebius if (*ac != 0 && isdigit(***av)) { 482220835Sglebius if ((sep = strchr(**av, ':')) != NULL) { 483220835Sglebius if (StrToAddrAndPortRange(**av, &r->raddr, protoName, 484187770Sluigi &portRange) != 0) 485220835Sglebius errx(EX_DATAERR, "redirect_port: " 486187770Sluigi "invalid remote port range"); 487187770Sluigi } else { 488220802Sglebius SETLOPORT(portRange, 0); 489187770Sluigi SETNUMPORTS(portRange, 1); 490220835Sglebius StrToAddr(**av, &r->raddr); 491187770Sluigi } 492220835Sglebius (*av)++; (*ac)--; 493187770Sluigi } else { 494187770Sluigi SETLOPORT(portRange, 0); 495187770Sluigi SETNUMPORTS(portRange, 1); 496187770Sluigi r->raddr.s_addr = INADDR_ANY; 497187770Sluigi } 498187770Sluigi r->rport = GETLOPORT(portRange); 499187770Sluigi r->rport_cnt = GETNUMPORTS(portRange); 500187770Sluigi 501220802Sglebius /* 502187770Sluigi * Make sure port ranges match up, then add the redirect ports. 503187770Sluigi */ 504187770Sluigi if (numLocalPorts != r->pport_cnt) 505220835Sglebius errx(EX_DATAERR, "redirect_port: " 506187770Sluigi "port ranges must be equal in size"); 507187770Sluigi 508187770Sluigi /* Remote port range is allowed to be '0' which means all ports. */ 509220802Sglebius if (r->rport_cnt != numLocalPorts && 510187770Sluigi (r->rport_cnt != 1 || r->rport != 0)) 511220802Sglebius errx(EX_DATAERR, "redirect_port: remote port must" 512187770Sluigi "be 0 or equal to local port range in size"); 513187770Sluigi 514220835Sglebius /* Setup LSNAT server pool. */ 515220835Sglebius if (lsnat != NULL) { 516220835Sglebius struct cfg_spool *spool; 517220835Sglebius 518220835Sglebius sep = strtok(lsnat, ","); 519187770Sluigi while (sep != NULL) { 520220835Sglebius spool = (struct cfg_spool *)buf; 521220835Sglebius space += sizeof(struct cfg_spool); 522188294Spiso /* 523220835Sglebius * The sctp nat does not allow the port numbers to 524220835Sglebius * be mapped to new port numbers. Therefore, no ports 525220835Sglebius * are to be specified in the target port field. 526188294Spiso */ 527188294Spiso if (r->proto == IPPROTO_SCTP) { 528188294Spiso if (strchr (sep, ':')) { 529188294Spiso errx(EX_DATAERR, "redirect_port:" 530188294Spiso "port numbers do not change in " 531188294Spiso "sctp, so do not specify them as " 532188294Spiso "part of the target"); 533188294Spiso } else { 534220835Sglebius StrToAddr(sep, &spool->addr); 535220835Sglebius spool->port = r->pport; 536188294Spiso } 537188294Spiso } else { 538220835Sglebius if (StrToAddrAndPortRange(sep, &spool->addr, 539188294Spiso protoName, &portRange) != 0) 540188294Spiso errx(EX_DATAERR, "redirect_port:" 541188294Spiso "invalid local port range"); 542188294Spiso if (GETNUMPORTS(portRange) != 1) 543188294Spiso errx(EX_DATAERR, "redirect_port: " 544188294Spiso "local port must be single in " 545188294Spiso "this context"); 546220835Sglebius spool->port = GETLOPORT(portRange); 547188294Spiso } 548220804Sglebius r->spool_cnt++; 549187770Sluigi /* Point to the next possible cfg_spool. */ 550220835Sglebius buf = &buf[sizeof(struct cfg_spool)]; 551187770Sluigi sep = strtok(NULL, ","); 552187770Sluigi } 553187770Sluigi } 554220835Sglebius 555187770Sluigi return (space); 556187770Sluigi} 557187770Sluigi 558187770Sluigistatic int 559220835Sglebiussetup_redir_proto(char *buf, int *ac, char ***av) 560187770Sluigi{ 561220835Sglebius struct cfg_redir *r; 562187770Sluigi struct protoent *protoent; 563220835Sglebius size_t space; 564220804Sglebius 565220835Sglebius r = (struct cfg_redir *)buf; 566187770Sluigi r->mode = REDIR_PROTO; 567220835Sglebius /* Skip cfg_redir at beginning of buf. */ 568220835Sglebius buf = &buf[sizeof(struct cfg_redir)]; 569220835Sglebius space = sizeof(struct cfg_redir); 570220835Sglebius 571187770Sluigi /* 572187770Sluigi * Extract protocol. 573220804Sglebius */ 574220835Sglebius protoent = getprotobyname(**av); 575187770Sluigi if (protoent == NULL) 576220835Sglebius errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av); 577187770Sluigi else 578187770Sluigi r->proto = protoent->p_proto; 579187770Sluigi 580220835Sglebius (*av)++; (*ac)--; 581220804Sglebius 582187770Sluigi /* 583187770Sluigi * Extract local address. 584187770Sluigi */ 585220835Sglebius StrToAddr(**av, &r->laddr); 586187770Sluigi 587220835Sglebius (*av)++; (*ac)--; 588220804Sglebius 589187770Sluigi /* 590187770Sluigi * Extract optional public address. 591187770Sluigi */ 592220835Sglebius if (*ac == 0) { 593220804Sglebius r->paddr.s_addr = INADDR_ANY; 594220804Sglebius r->raddr.s_addr = INADDR_ANY; 595187770Sluigi } else { 596187770Sluigi /* see above in setup_redir_port() */ 597223185Sglebius if (isdigit(***av)) { 598220835Sglebius StrToAddr(**av, &r->paddr); 599220835Sglebius (*av)++; (*ac)--; 600220804Sglebius 601187770Sluigi /* 602187770Sluigi * Extract optional remote address. 603220804Sglebius */ 604187770Sluigi /* see above in setup_redir_port() */ 605223185Sglebius if (*ac != 0 && isdigit(***av)) { 606220835Sglebius StrToAddr(**av, &r->raddr); 607220835Sglebius (*av)++; (*ac)--; 608187770Sluigi } 609220804Sglebius } 610187770Sluigi } 611220835Sglebius 612187770Sluigi return (space); 613187770Sluigi} 614187770Sluigi 615187770Sluigistatic void 616187770Sluigiprint_nat_config(unsigned char *buf) 617187770Sluigi{ 618187770Sluigi struct cfg_nat *n; 619187770Sluigi int i, cnt, flag, off; 620187770Sluigi struct cfg_redir *t; 621187770Sluigi struct cfg_spool *s; 622187770Sluigi struct protoent *p; 623187770Sluigi 624187770Sluigi n = (struct cfg_nat *)buf; 625187770Sluigi flag = 1; 626187770Sluigi off = sizeof(*n); 627187770Sluigi printf("ipfw nat %u config", n->id); 628187770Sluigi if (strlen(n->if_name) != 0) 629187770Sluigi printf(" if %s", n->if_name); 630187770Sluigi else if (n->ip.s_addr != 0) 631187770Sluigi printf(" ip %s", inet_ntoa(n->ip)); 632187770Sluigi while (n->mode != 0) { 633187770Sluigi if (n->mode & PKT_ALIAS_LOG) { 634187770Sluigi printf(" log"); 635187770Sluigi n->mode &= ~PKT_ALIAS_LOG; 636187770Sluigi } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { 637187770Sluigi printf(" deny_in"); 638187770Sluigi n->mode &= ~PKT_ALIAS_DENY_INCOMING; 639187770Sluigi } else if (n->mode & PKT_ALIAS_SAME_PORTS) { 640187770Sluigi printf(" same_ports"); 641187770Sluigi n->mode &= ~PKT_ALIAS_SAME_PORTS; 642223080Sae } else if (n->mode & PKT_ALIAS_SKIP_GLOBAL) { 643223080Sae printf(" skip_global"); 644223080Sae n->mode &= ~PKT_ALIAS_SKIP_GLOBAL; 645187770Sluigi } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { 646187770Sluigi printf(" unreg_only"); 647187770Sluigi n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; 648187770Sluigi } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { 649187770Sluigi printf(" reset"); 650187770Sluigi n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; 651187770Sluigi } else if (n->mode & PKT_ALIAS_REVERSE) { 652187770Sluigi printf(" reverse"); 653187770Sluigi n->mode &= ~PKT_ALIAS_REVERSE; 654187770Sluigi } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { 655187770Sluigi printf(" proxy_only"); 656187770Sluigi n->mode &= ~PKT_ALIAS_PROXY_ONLY; 657187770Sluigi } 658187770Sluigi } 659187770Sluigi /* Print all the redirect's data configuration. */ 660187770Sluigi for (cnt = 0; cnt < n->redir_cnt; cnt++) { 661187770Sluigi t = (struct cfg_redir *)&buf[off]; 662187770Sluigi off += SOF_REDIR; 663187770Sluigi switch (t->mode) { 664187770Sluigi case REDIR_ADDR: 665187770Sluigi printf(" redirect_addr"); 666187770Sluigi if (t->spool_cnt == 0) 667187770Sluigi printf(" %s", inet_ntoa(t->laddr)); 668187770Sluigi else 669187770Sluigi for (i = 0; i < t->spool_cnt; i++) { 670187770Sluigi s = (struct cfg_spool *)&buf[off]; 671187770Sluigi if (i) 672187770Sluigi printf(","); 673220802Sglebius else 674187770Sluigi printf(" "); 675187770Sluigi printf("%s", inet_ntoa(s->addr)); 676187770Sluigi off += SOF_SPOOL; 677187770Sluigi } 678187770Sluigi printf(" %s", inet_ntoa(t->paddr)); 679187770Sluigi break; 680187770Sluigi case REDIR_PORT: 681187770Sluigi p = getprotobynumber(t->proto); 682187770Sluigi printf(" redirect_port %s ", p->p_name); 683187770Sluigi if (!t->spool_cnt) { 684187770Sluigi printf("%s:%u", inet_ntoa(t->laddr), t->lport); 685187770Sluigi if (t->pport_cnt > 1) 686220802Sglebius printf("-%u", t->lport + 687187770Sluigi t->pport_cnt - 1); 688187770Sluigi } else 689187770Sluigi for (i=0; i < t->spool_cnt; i++) { 690187770Sluigi s = (struct cfg_spool *)&buf[off]; 691187770Sluigi if (i) 692187770Sluigi printf(","); 693220802Sglebius printf("%s:%u", inet_ntoa(s->addr), 694187770Sluigi s->port); 695187770Sluigi off += SOF_SPOOL; 696187770Sluigi } 697187770Sluigi 698187770Sluigi printf(" "); 699187770Sluigi if (t->paddr.s_addr) 700220802Sglebius printf("%s:", inet_ntoa(t->paddr)); 701187770Sluigi printf("%u", t->pport); 702187770Sluigi if (!t->spool_cnt && t->pport_cnt > 1) 703187770Sluigi printf("-%u", t->pport + t->pport_cnt - 1); 704187770Sluigi 705187770Sluigi if (t->raddr.s_addr) { 706187770Sluigi printf(" %s", inet_ntoa(t->raddr)); 707187770Sluigi if (t->rport) { 708187770Sluigi printf(":%u", t->rport); 709187770Sluigi if (!t->spool_cnt && t->rport_cnt > 1) 710220802Sglebius printf("-%u", t->rport + 711187770Sluigi t->rport_cnt - 1); 712187770Sluigi } 713187770Sluigi } 714187770Sluigi break; 715187770Sluigi case REDIR_PROTO: 716187770Sluigi p = getprotobynumber(t->proto); 717220802Sglebius printf(" redirect_proto %s %s", p->p_name, 718187770Sluigi inet_ntoa(t->laddr)); 719187770Sluigi if (t->paddr.s_addr != 0) { 720187770Sluigi printf(" %s", inet_ntoa(t->paddr)); 721187770Sluigi if (t->raddr.s_addr) 722187770Sluigi printf(" %s", inet_ntoa(t->raddr)); 723187770Sluigi } 724187770Sluigi break; 725187770Sluigi default: 726187770Sluigi errx(EX_DATAERR, "unknown redir mode"); 727187770Sluigi break; 728187770Sluigi } 729187770Sluigi } 730187770Sluigi printf("\n"); 731187770Sluigi} 732187770Sluigi 733187770Sluigivoid 734187770Sluigiipfw_config_nat(int ac, char **av) 735187770Sluigi{ 736220802Sglebius struct cfg_nat *n; /* Nat instance configuration. */ 737220835Sglebius int i, off, tok, ac1; 738223079Sae char *id, *buf, **av1, *end; 739220835Sglebius size_t len; 740220804Sglebius 741223499Sglebius av++; 742223499Sglebius ac--; 743187770Sluigi /* Nat id. */ 744223079Sae if (ac == 0) 745187770Sluigi errx(EX_DATAERR, "missing nat id"); 746223079Sae id = *av; 747223079Sae i = (int)strtol(id, &end, 0); 748223079Sae if (i <= 0 || *end != '\0') 749223079Sae errx(EX_DATAERR, "illegal nat id: %s", id); 750223499Sglebius av++; 751223499Sglebius ac--; 752220802Sglebius if (ac == 0) 753187770Sluigi errx(EX_DATAERR, "missing option"); 754187770Sluigi 755220835Sglebius len = sizeof(struct cfg_nat); 756220835Sglebius ac1 = ac; 757220835Sglebius av1 = av; 758220835Sglebius while (ac1 > 0) { 759220835Sglebius tok = match_token(nat_params, *av1); 760223499Sglebius ac1--; 761223499Sglebius av1++; 762220835Sglebius switch (tok) { 763220835Sglebius case TOK_IP: 764220835Sglebius case TOK_IF: 765223499Sglebius ac1--; 766223499Sglebius av1++; 767223080Sae break; 768220835Sglebius case TOK_ALOG: 769220835Sglebius case TOK_DENY_INC: 770220835Sglebius case TOK_SAME_PORTS: 771223080Sae case TOK_SKIP_GLOBAL: 772220835Sglebius case TOK_UNREG_ONLY: 773220835Sglebius case TOK_RESET_ADDR: 774220835Sglebius case TOK_ALIAS_REV: 775220835Sglebius case TOK_PROXY_ONLY: 776220835Sglebius break; 777220835Sglebius case TOK_REDIR_ADDR: 778220835Sglebius if (ac1 < 2) 779220835Sglebius errx(EX_DATAERR, "redirect_addr: " 780220835Sglebius "not enough arguments"); 781220835Sglebius len += estimate_redir_addr(&ac1, &av1); 782223499Sglebius av1 += 2; 783223499Sglebius ac1 -= 2; 784220835Sglebius break; 785220835Sglebius case TOK_REDIR_PORT: 786220835Sglebius if (ac1 < 3) 787220835Sglebius errx(EX_DATAERR, "redirect_port: " 788220835Sglebius "not enough arguments"); 789223499Sglebius av1++; 790223499Sglebius ac1--; 791220835Sglebius len += estimate_redir_port(&ac1, &av1); 792223499Sglebius av1 += 2; 793223499Sglebius ac1 -= 2; 794223185Sglebius /* Skip optional remoteIP/port */ 795223416Sglebius if (ac1 != 0 && isdigit(**av1)) { 796223499Sglebius av1++; 797223499Sglebius ac1--; 798223416Sglebius } 799220835Sglebius break; 800220835Sglebius case TOK_REDIR_PROTO: 801220835Sglebius if (ac1 < 2) 802220835Sglebius errx(EX_DATAERR, "redirect_proto: " 803220835Sglebius "not enough arguments"); 804220835Sglebius len += sizeof(struct cfg_redir); 805223499Sglebius av1 += 2; 806223499Sglebius ac1 -= 2; 807223185Sglebius /* Skip optional remoteIP/port */ 808223416Sglebius if (ac1 != 0 && isdigit(**av1)) { 809223499Sglebius av1++; 810223499Sglebius ac1--; 811223416Sglebius } 812223416Sglebius if (ac1 != 0 && isdigit(**av1)) { 813223499Sglebius av1++; 814223499Sglebius ac1--; 815223416Sglebius } 816220835Sglebius break; 817220835Sglebius default: 818220835Sglebius errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]); 819220835Sglebius } 820220835Sglebius } 821220835Sglebius 822220835Sglebius if ((buf = malloc(len)) == NULL) 823220835Sglebius errx(EX_OSERR, "malloc failed"); 824220835Sglebius 825220835Sglebius /* Offset in buf: save space for n at the beginning. */ 826220835Sglebius off = sizeof(*n); 827220835Sglebius memset(buf, 0, len); 828220835Sglebius n = (struct cfg_nat *)buf; 829220835Sglebius n->id = i; 830220835Sglebius 831187770Sluigi while (ac > 0) { 832187770Sluigi tok = match_token(nat_params, *av); 833223499Sglebius ac--; 834223499Sglebius av++; 835187770Sluigi switch (tok) { 836187770Sluigi case TOK_IP: 837220802Sglebius if (ac == 0) 838187770Sluigi errx(EX_DATAERR, "missing option"); 839187770Sluigi if (!inet_aton(av[0], &(n->ip))) 840220802Sglebius errx(EX_DATAERR, "bad ip address ``%s''", 841187770Sluigi av[0]); 842223499Sglebius ac--; 843223499Sglebius av++; 844220802Sglebius break; 845187770Sluigi case TOK_IF: 846220802Sglebius if (ac == 0) 847187770Sluigi errx(EX_DATAERR, "missing option"); 848187770Sluigi set_addr_dynamic(av[0], n); 849223499Sglebius ac--; 850223499Sglebius av++; 851187770Sluigi break; 852187770Sluigi case TOK_ALOG: 853187770Sluigi n->mode |= PKT_ALIAS_LOG; 854187770Sluigi break; 855187770Sluigi case TOK_DENY_INC: 856187770Sluigi n->mode |= PKT_ALIAS_DENY_INCOMING; 857187770Sluigi break; 858187770Sluigi case TOK_SAME_PORTS: 859187770Sluigi n->mode |= PKT_ALIAS_SAME_PORTS; 860187770Sluigi break; 861187770Sluigi case TOK_UNREG_ONLY: 862187770Sluigi n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; 863187770Sluigi break; 864223080Sae case TOK_SKIP_GLOBAL: 865223080Sae n->mode |= PKT_ALIAS_SKIP_GLOBAL; 866223080Sae break; 867187770Sluigi case TOK_RESET_ADDR: 868187770Sluigi n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; 869187770Sluigi break; 870187770Sluigi case TOK_ALIAS_REV: 871187770Sluigi n->mode |= PKT_ALIAS_REVERSE; 872187770Sluigi break; 873187770Sluigi case TOK_PROXY_ONLY: 874187770Sluigi n->mode |= PKT_ALIAS_PROXY_ONLY; 875187770Sluigi break; 876220802Sglebius /* 877220802Sglebius * All the setup_redir_* functions work directly in 878220802Sglebius * the final buffer, see above for details. 879187770Sluigi */ 880187770Sluigi case TOK_REDIR_ADDR: 881187770Sluigi case TOK_REDIR_PORT: 882187770Sluigi case TOK_REDIR_PROTO: 883187770Sluigi switch (tok) { 884187770Sluigi case TOK_REDIR_ADDR: 885220835Sglebius i = setup_redir_addr(&buf[off], &ac, &av); 886220802Sglebius break; 887187770Sluigi case TOK_REDIR_PORT: 888220835Sglebius i = setup_redir_port(&buf[off], &ac, &av); 889220802Sglebius break; 890187770Sluigi case TOK_REDIR_PROTO: 891220835Sglebius i = setup_redir_proto(&buf[off], &ac, &av); 892187770Sluigi break; 893187770Sluigi } 894187770Sluigi n->redir_cnt++; 895187770Sluigi off += i; 896187770Sluigi break; 897187770Sluigi } 898187770Sluigi } 899187770Sluigi 900187770Sluigi i = do_cmd(IP_FW_NAT_CFG, buf, off); 901187770Sluigi if (i) 902187770Sluigi err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); 903187770Sluigi 904187770Sluigi if (!co.do_quiet) { 905187770Sluigi /* After every modification, we show the resultant rule. */ 906187770Sluigi int _ac = 3; 907189395Sluigi const char *_av[] = {"show", "config", id}; 908189395Sluigi ipfw_show_nat(_ac, (char **)(void *)_av); 909187770Sluigi } 910187770Sluigi} 911187770Sluigi 912187770Sluigi 913187770Sluigivoid 914187770Sluigiipfw_show_nat(int ac, char **av) 915187770Sluigi{ 916187770Sluigi struct cfg_nat *n; 917187770Sluigi struct cfg_redir *e; 918187770Sluigi int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; 919187770Sluigi int nat_cnt, redir_cnt, r; 920187770Sluigi uint8_t *data, *p; 921187770Sluigi char *endptr; 922187770Sluigi 923187770Sluigi do_rule = 0; 924187770Sluigi nalloc = 1024; 925187770Sluigi size = 0; 926187770Sluigi data = NULL; 927187770Sluigi frule = 0; 928187770Sluigi lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */ 929223499Sglebius ac--; 930223499Sglebius av++; 931187770Sluigi 932187770Sluigi if (co.test_only) 933187770Sluigi return; 934187770Sluigi 935187770Sluigi /* Parse parameters. */ 936187770Sluigi for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { 937187770Sluigi if (!strncmp(av[0], "config", strlen(av[0]))) { 938220802Sglebius cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; 939187770Sluigi continue; 940187770Sluigi } 941187770Sluigi /* Convert command line rule #. */ 942187770Sluigi frule = lrule = strtoul(av[0], &endptr, 10); 943187770Sluigi if (*endptr == '-') 944187770Sluigi lrule = strtoul(endptr+1, &endptr, 10); 945220804Sglebius if (lrule == 0) 946187770Sluigi err(EX_USAGE, "invalid rule number: %s", av[0]); 947187770Sluigi do_rule = 1; 948187770Sluigi } 949187770Sluigi 950187770Sluigi nbytes = nalloc; 951187770Sluigi while (nbytes >= nalloc) { 952187770Sluigi nalloc = nalloc * 2; 953187770Sluigi nbytes = nalloc; 954187770Sluigi data = safe_realloc(data, nbytes); 955187770Sluigi if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) 956187770Sluigi err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", 957187770Sluigi (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); 958187770Sluigi } 959187770Sluigi if (nbytes == 0) 960187770Sluigi exit(0); 961187770Sluigi if (do_cfg) { 962187770Sluigi nat_cnt = *((int *)data); 963187770Sluigi for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { 964187770Sluigi n = (struct cfg_nat *)&data[i]; 965187770Sluigi if (frule <= n->id && lrule >= n->id) 966187770Sluigi print_nat_config(&data[i]); 967187770Sluigi i += sizeof(struct cfg_nat); 968187770Sluigi for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) { 969187770Sluigi e = (struct cfg_redir *)&data[i]; 970220802Sglebius i += sizeof(struct cfg_redir) + e->spool_cnt * 971187770Sluigi sizeof(struct cfg_spool); 972187770Sluigi } 973187770Sluigi } 974187770Sluigi } else { 975187770Sluigi for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { 976187770Sluigi p = &data[i]; 977187770Sluigi if (p == data + nbytes) 978187770Sluigi break; 979187770Sluigi bcopy(p, &r, sizeof(int)); 980187770Sluigi if (do_rule) { 981187770Sluigi if (!(frule <= r && lrule >= r)) 982187770Sluigi continue; 983187770Sluigi } 984187770Sluigi printf("nat %u: %s\n", r, p+sizeof(int)); 985187770Sluigi } 986187770Sluigi } 987187770Sluigi} 988