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 23#include <sys/types.h> 24#include <sys/param.h> 25#include <sys/socket.h> 26#include <sys/sockio.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 <grp.h> 35#include <netdb.h> 36#include <pwd.h> 37#include <stdio.h> 38#include <stdlib.h> 39#include <string.h> 40#include <sysexits.h> 41#include <time.h> /* ctime */ 42#include <timeconv.h> /* _long_to_time */ 43#include <unistd.h> 44#include <fcntl.h> 45#include <stddef.h> /* offsetof */ 46 47#include <net/ethernet.h> 48#include <net/if.h> /* only IFNAMSIZ */ 49#include <netinet/in.h> 50#include <netinet/in_systm.h> /* only n_short, n_long */ 51#include <netinet/ip.h> 52#include <netinet/ip_icmp.h> 53#include <netinet/ip_fw.h> 54#include <netinet/tcp.h> 55#include <arpa/inet.h> 56 57struct cmdline_opts co; /* global options */ 58 59int resvd_set_number = RESVD_SET; 60 61int ipfw_socket = -1; 62 63uint32_t ipfw_tables_max = 0; /* Number of tables supported by kernel */ 64 65#ifndef s6_addr32 66#define s6_addr32 __u6_addr.__u6_addr32 67#endif 68 69#define CHECK_LENGTH(v, len) do { \ 70 if ((v) < (len)) \ 71 errx(EX_DATAERR, "Rule too long"); \ 72 } while (0) 73/* 74 * Check if we have enough space in cmd buffer. Note that since 75 * first 8? u32 words are reserved by reserved header, full cmd 76 * buffer can't be used, so we need to protect from buffer overrun 77 * only. At the beginnig, cblen is less than actual buffer size by 78 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need 79 * for checking small instructions fitting in given range. 80 * We also (ab)use the fact that ipfw_insn is always the first field 81 * for any custom instruction. 82 */ 83#define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) 84 85#define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 86 if (!av[0]) \ 87 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 88 if (_substrcmp(*av, "tablearg") == 0) { \ 89 arg = IP_FW_TABLEARG; \ 90 break; \ 91 } \ 92 \ 93 { \ 94 long _xval; \ 95 char *end; \ 96 \ 97 _xval = strtol(*av, &end, 10); \ 98 \ 99 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 100 errx(EX_DATAERR, "%s: invalid argument: %s", \ 101 match_value(s_x, tok), *av); \ 102 \ 103 if (errno == ERANGE || _xval < min || _xval > max) \ 104 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 105 match_value(s_x, tok), min, max, *av); \ 106 \ 107 if (_xval == IP_FW_TABLEARG) \ 108 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 109 match_value(s_x, tok), *av); \ 110 arg = _xval; \ 111 } \ 112} while (0) 113 114static void 115PRINT_UINT_ARG(const char *str, uint32_t arg) 116{ 117 if (str != NULL) 118 printf("%s",str); 119 if (arg == IP_FW_TABLEARG) 120 printf("tablearg"); 121 else 122 printf("%u", arg); 123} 124 125static struct _s_x f_tcpflags[] = { 126 { "syn", TH_SYN }, 127 { "fin", TH_FIN }, 128 { "ack", TH_ACK }, 129 { "psh", TH_PUSH }, 130 { "rst", TH_RST }, 131 { "urg", TH_URG }, 132 { "tcp flag", 0 }, 133 { NULL, 0 } 134}; 135 136static struct _s_x f_tcpopts[] = { 137 { "mss", IP_FW_TCPOPT_MSS }, 138 { "maxseg", IP_FW_TCPOPT_MSS }, 139 { "window", IP_FW_TCPOPT_WINDOW }, 140 { "sack", IP_FW_TCPOPT_SACK }, 141 { "ts", IP_FW_TCPOPT_TS }, 142 { "timestamp", IP_FW_TCPOPT_TS }, 143 { "cc", IP_FW_TCPOPT_CC }, 144 { "tcp option", 0 }, 145 { NULL, 0 } 146}; 147 148/* 149 * IP options span the range 0 to 255 so we need to remap them 150 * (though in fact only the low 5 bits are significant). 151 */ 152static struct _s_x f_ipopts[] = { 153 { "ssrr", IP_FW_IPOPT_SSRR}, 154 { "lsrr", IP_FW_IPOPT_LSRR}, 155 { "rr", IP_FW_IPOPT_RR}, 156 { "ts", IP_FW_IPOPT_TS}, 157 { "ip option", 0 }, 158 { NULL, 0 } 159}; 160 161static struct _s_x f_iptos[] = { 162 { "lowdelay", IPTOS_LOWDELAY}, 163 { "throughput", IPTOS_THROUGHPUT}, 164 { "reliability", IPTOS_RELIABILITY}, 165 { "mincost", IPTOS_MINCOST}, 166 { "congestion", IPTOS_ECN_CE}, 167 { "ecntransport", IPTOS_ECN_ECT0}, 168 { "ip tos option", 0}, 169 { NULL, 0 } 170}; 171 172static struct _s_x f_ipdscp[] = { 173 { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ 174 { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ 175 { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ 176 { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ 177 { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ 178 { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ 179 { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ 180 { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ 181 { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ 182 { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ 183 { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ 184 { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ 185 { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 186 { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ 187 { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 188 { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ 189 { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ 190 { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ 191 { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ 192 { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ 193 { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ 194 { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ 195 { NULL, 0 } 196}; 197 198static struct _s_x limit_masks[] = { 199 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 200 {"src-addr", DYN_SRC_ADDR}, 201 {"src-port", DYN_SRC_PORT}, 202 {"dst-addr", DYN_DST_ADDR}, 203 {"dst-port", DYN_DST_PORT}, 204 {NULL, 0} 205}; 206 207/* 208 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 209 * This is only used in this code. 210 */ 211#define IPPROTO_ETHERTYPE 0x1000 212static struct _s_x ether_types[] = { 213 /* 214 * Note, we cannot use "-:&/" in the names because they are field 215 * separators in the type specifications. Also, we use s = NULL as 216 * end-delimiter, because a type of 0 can be legal. 217 */ 218 { "ip", 0x0800 }, 219 { "ipv4", 0x0800 }, 220 { "ipv6", 0x86dd }, 221 { "arp", 0x0806 }, 222 { "rarp", 0x8035 }, 223 { "vlan", 0x8100 }, 224 { "loop", 0x9000 }, 225 { "trail", 0x1000 }, 226 { "at", 0x809b }, 227 { "atalk", 0x809b }, 228 { "aarp", 0x80f3 }, 229 { "pppoe_disc", 0x8863 }, 230 { "pppoe_sess", 0x8864 }, 231 { "ipx_8022", 0x00E0 }, 232 { "ipx_8023", 0x0000 }, 233 { "ipx_ii", 0x8137 }, 234 { "ipx_snap", 0x8137 }, 235 { "ipx", 0x8137 }, 236 { "ns", 0x0600 }, 237 { NULL, 0 } 238}; 239 240 241static struct _s_x rule_actions[] = { 242 { "accept", TOK_ACCEPT }, 243 { "pass", TOK_ACCEPT }, 244 { "allow", TOK_ACCEPT }, 245 { "permit", TOK_ACCEPT }, 246 { "count", TOK_COUNT }, 247 { "pipe", TOK_PIPE }, 248 { "queue", TOK_QUEUE }, 249 { "divert", TOK_DIVERT }, 250 { "tee", TOK_TEE }, 251 { "netgraph", TOK_NETGRAPH }, 252 { "ngtee", TOK_NGTEE }, 253 { "fwd", TOK_FORWARD }, 254 { "forward", TOK_FORWARD }, 255 { "skipto", TOK_SKIPTO }, 256 { "deny", TOK_DENY }, 257 { "drop", TOK_DENY }, 258 { "reject", TOK_REJECT }, 259 { "reset6", TOK_RESET6 }, 260 { "reset", TOK_RESET }, 261 { "unreach6", TOK_UNREACH6 }, 262 { "unreach", TOK_UNREACH }, 263 { "check-state", TOK_CHECKSTATE }, 264 { "//", TOK_COMMENT }, 265 { "nat", TOK_NAT }, 266 { "reass", TOK_REASS }, 267 { "setfib", TOK_SETFIB }, 268 { "setdscp", TOK_SETDSCP }, 269 { "call", TOK_CALL }, 270 { "return", TOK_RETURN }, 271 { NULL, 0 } /* terminator */ 272}; 273 274static struct _s_x rule_action_params[] = { 275 { "altq", TOK_ALTQ }, 276 { "log", TOK_LOG }, 277 { "tag", TOK_TAG }, 278 { "untag", TOK_UNTAG }, 279 { NULL, 0 } /* terminator */ 280}; 281 282/* 283 * The 'lookup' instruction accepts one of the following arguments. 284 * -1 is a terminator for the list. 285 * Arguments are passed as v[1] in O_DST_LOOKUP options. 286 */ 287static int lookup_key[] = { 288 TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, 289 TOK_UID, TOK_JAIL, TOK_DSCP, -1 }; 290 291static struct _s_x rule_options[] = { 292 { "tagged", TOK_TAGGED }, 293 { "uid", TOK_UID }, 294 { "gid", TOK_GID }, 295 { "jail", TOK_JAIL }, 296 { "in", TOK_IN }, 297 { "limit", TOK_LIMIT }, 298 { "keep-state", TOK_KEEPSTATE }, 299 { "bridged", TOK_LAYER2 }, 300 { "layer2", TOK_LAYER2 }, 301 { "out", TOK_OUT }, 302 { "diverted", TOK_DIVERTED }, 303 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 304 { "diverted-output", TOK_DIVERTEDOUTPUT }, 305 { "xmit", TOK_XMIT }, 306 { "recv", TOK_RECV }, 307 { "via", TOK_VIA }, 308 { "fragment", TOK_FRAG }, 309 { "frag", TOK_FRAG }, 310 { "fib", TOK_FIB }, 311 { "ipoptions", TOK_IPOPTS }, 312 { "ipopts", TOK_IPOPTS }, 313 { "iplen", TOK_IPLEN }, 314 { "ipid", TOK_IPID }, 315 { "ipprecedence", TOK_IPPRECEDENCE }, 316 { "dscp", TOK_DSCP }, 317 { "iptos", TOK_IPTOS }, 318 { "ipttl", TOK_IPTTL }, 319 { "ipversion", TOK_IPVER }, 320 { "ipver", TOK_IPVER }, 321 { "estab", TOK_ESTAB }, 322 { "established", TOK_ESTAB }, 323 { "setup", TOK_SETUP }, 324 { "sockarg", TOK_SOCKARG }, 325 { "tcpdatalen", TOK_TCPDATALEN }, 326 { "tcpflags", TOK_TCPFLAGS }, 327 { "tcpflgs", TOK_TCPFLAGS }, 328 { "tcpoptions", TOK_TCPOPTS }, 329 { "tcpopts", TOK_TCPOPTS }, 330 { "tcpseq", TOK_TCPSEQ }, 331 { "tcpack", TOK_TCPACK }, 332 { "tcpwin", TOK_TCPWIN }, 333 { "icmptype", TOK_ICMPTYPES }, 334 { "icmptypes", TOK_ICMPTYPES }, 335 { "dst-ip", TOK_DSTIP }, 336 { "src-ip", TOK_SRCIP }, 337 { "dst-port", TOK_DSTPORT }, 338 { "src-port", TOK_SRCPORT }, 339 { "proto", TOK_PROTO }, 340 { "MAC", TOK_MAC }, 341 { "mac", TOK_MAC }, 342 { "mac-type", TOK_MACTYPE }, 343 { "verrevpath", TOK_VERREVPATH }, 344 { "versrcreach", TOK_VERSRCREACH }, 345 { "antispoof", TOK_ANTISPOOF }, 346 { "ipsec", TOK_IPSEC }, 347 { "icmp6type", TOK_ICMP6TYPES }, 348 { "icmp6types", TOK_ICMP6TYPES }, 349 { "ext6hdr", TOK_EXT6HDR}, 350 { "flow-id", TOK_FLOWID}, 351 { "ipv6", TOK_IPV6}, 352 { "ip6", TOK_IPV6}, 353 { "ipv4", TOK_IPV4}, 354 { "ip4", TOK_IPV4}, 355 { "dst-ipv6", TOK_DSTIP6}, 356 { "dst-ip6", TOK_DSTIP6}, 357 { "src-ipv6", TOK_SRCIP6}, 358 { "src-ip6", TOK_SRCIP6}, 359 { "lookup", TOK_LOOKUP}, 360 { "//", TOK_COMMENT }, 361 362 { "not", TOK_NOT }, /* pseudo option */ 363 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 364 { "or", TOK_OR }, /* pseudo option */ 365 { "|", /* escape */ TOK_OR }, /* pseudo option */ 366 { "{", TOK_STARTBRACE }, /* pseudo option */ 367 { "(", TOK_STARTBRACE }, /* pseudo option */ 368 { "}", TOK_ENDBRACE }, /* pseudo option */ 369 { ")", TOK_ENDBRACE }, /* pseudo option */ 370 { NULL, 0 } /* terminator */ 371}; 372 373/* 374 * Helper routine to print a possibly unaligned uint64_t on 375 * various platform. If width > 0, print the value with 376 * the desired width, followed by a space; 377 * otherwise, return the required width. 378 */ 379int 380pr_u64(uint64_t *pd, int width) 381{ 382#ifdef TCC 383#define U64_FMT "I64" 384#else 385#define U64_FMT "llu" 386#endif 387 uint64_t u; 388 unsigned long long d; 389 390 bcopy (pd, &u, sizeof(u)); 391 d = u; 392 return (width > 0) ? 393 printf("%*" U64_FMT " ", width, d) : 394 snprintf(NULL, 0, "%" U64_FMT, d) ; 395#undef U64_FMT 396} 397 398void * 399safe_calloc(size_t number, size_t size) 400{ 401 void *ret = calloc(number, size); 402 403 if (ret == NULL) 404 err(EX_OSERR, "calloc"); 405 return ret; 406} 407 408void * 409safe_realloc(void *ptr, size_t size) 410{ 411 void *ret = realloc(ptr, size); 412 413 if (ret == NULL) 414 err(EX_OSERR, "realloc"); 415 return ret; 416} 417 418/* 419 * conditionally runs the command. 420 * Selected options or negative -> getsockopt 421 */ 422int 423do_cmd(int optname, void *optval, uintptr_t optlen) 424{ 425 int i; 426 427 if (co.test_only) 428 return 0; 429 430 if (ipfw_socket == -1) 431 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 432 if (ipfw_socket < 0) 433 err(EX_UNAVAILABLE, "socket"); 434 435 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 436 optname == IP_FW_ADD || optname == IP_FW3 || 437 optname == IP_FW_NAT_GET_CONFIG || 438 optname < 0 || 439 optname == IP_FW_NAT_GET_LOG) { 440 if (optname < 0) 441 optname = -optname; 442 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 443 (socklen_t *)optlen); 444 } else { 445 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 446 } 447 return i; 448} 449 450/* 451 * do_setcmd3 - pass ipfw control cmd to kernel 452 * @optname: option name 453 * @optval: pointer to option data 454 * @optlen: option length 455 * 456 * Function encapsulates option value in IP_FW3 socket option 457 * and calls setsockopt(). 458 * Function returns 0 on success or -1 otherwise. 459 */ 460int 461do_setcmd3(int optname, void *optval, socklen_t optlen) 462{ 463 socklen_t len; 464 ip_fw3_opheader *op3; 465 466 if (co.test_only) 467 return (0); 468 469 if (ipfw_socket == -1) 470 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 471 if (ipfw_socket < 0) 472 err(EX_UNAVAILABLE, "socket"); 473 474 len = sizeof(ip_fw3_opheader) + optlen; 475 op3 = alloca(len); 476 /* Zero reserved fields */ 477 memset(op3, 0, sizeof(ip_fw3_opheader)); 478 memcpy(op3 + 1, optval, optlen); 479 op3->opcode = optname; 480 481 return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len); 482} 483 484/** 485 * match_token takes a table and a string, returns the value associated 486 * with the string (-1 in case of failure). 487 */ 488int 489match_token(struct _s_x *table, char *string) 490{ 491 struct _s_x *pt; 492 uint i = strlen(string); 493 494 for (pt = table ; i && pt->s != NULL ; pt++) 495 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 496 return pt->x; 497 return -1; 498} 499 500/** 501 * match_value takes a table and a value, returns the string associated 502 * with the value (NULL in case of failure). 503 */ 504char const * 505match_value(struct _s_x *p, int value) 506{ 507 for (; p->s != NULL; p++) 508 if (p->x == value) 509 return p->s; 510 return NULL; 511} 512 513/* 514 * _substrcmp takes two strings and returns 1 if they do not match, 515 * and 0 if they match exactly or the first string is a sub-string 516 * of the second. A warning is printed to stderr in the case that the 517 * first string is a sub-string of the second. 518 * 519 * This function will be removed in the future through the usual 520 * deprecation process. 521 */ 522int 523_substrcmp(const char *str1, const char* str2) 524{ 525 526 if (strncmp(str1, str2, strlen(str1)) != 0) 527 return 1; 528 529 if (strlen(str1) != strlen(str2)) 530 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 531 str1, str2); 532 return 0; 533} 534 535/* 536 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 537 * and 0 if they match exactly or the second string is a sub-string 538 * of the first. A warning is printed to stderr in the case that the 539 * first string does not match the third. 540 * 541 * This function exists to warn about the bizzare construction 542 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 543 * for "bytes". The problem is that in addition to accepting "by", 544 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 545 * other string beginning with "by". 546 * 547 * This function will be removed in the future through the usual 548 * deprecation process. 549 */ 550int 551_substrcmp2(const char *str1, const char* str2, const char* str3) 552{ 553 554 if (strncmp(str1, str2, strlen(str2)) != 0) 555 return 1; 556 557 if (strcmp(str1, str3) != 0) 558 warnx("DEPRECATED: '%s' matched '%s'", 559 str1, str3); 560 return 0; 561} 562 563/* 564 * prints one port, symbolic or numeric 565 */ 566static void 567print_port(int proto, uint16_t port) 568{ 569 570 if (proto == IPPROTO_ETHERTYPE) { 571 char const *s; 572 573 if (co.do_resolv && (s = match_value(ether_types, port)) ) 574 printf("%s", s); 575 else 576 printf("0x%04x", port); 577 } else { 578 struct servent *se = NULL; 579 if (co.do_resolv) { 580 struct protoent *pe = getprotobynumber(proto); 581 582 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 583 } 584 if (se) 585 printf("%s", se->s_name); 586 else 587 printf("%d", port); 588 } 589} 590 591static struct _s_x _port_name[] = { 592 {"dst-port", O_IP_DSTPORT}, 593 {"src-port", O_IP_SRCPORT}, 594 {"ipid", O_IPID}, 595 {"iplen", O_IPLEN}, 596 {"ipttl", O_IPTTL}, 597 {"mac-type", O_MAC_TYPE}, 598 {"tcpdatalen", O_TCPDATALEN}, 599 {"tcpwin", O_TCPWIN}, 600 {"tagged", O_TAGGED}, 601 {NULL, 0} 602}; 603 604/* 605 * Print the values in a list 16-bit items of the types above. 606 * XXX todo: add support for mask. 607 */ 608static void 609print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 610{ 611 uint16_t *p = cmd->ports; 612 int i; 613 char const *sep; 614 615 if (opcode != 0) { 616 sep = match_value(_port_name, opcode); 617 if (sep == NULL) 618 sep = "???"; 619 printf (" %s", sep); 620 } 621 sep = " "; 622 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 623 printf("%s", sep); 624 print_port(proto, p[0]); 625 if (p[0] != p[1]) { 626 printf("-"); 627 print_port(proto, p[1]); 628 } 629 sep = ","; 630 } 631} 632 633/* 634 * Like strtol, but also translates service names into port numbers 635 * for some protocols. 636 * In particular: 637 * proto == -1 disables the protocol check; 638 * proto == IPPROTO_ETHERTYPE looks up an internal table 639 * proto == <some value in /etc/protocols> matches the values there. 640 * Returns *end == s in case the parameter is not found. 641 */ 642static int 643strtoport(char *s, char **end, int base, int proto) 644{ 645 char *p, *buf; 646 char *s1; 647 int i; 648 649 *end = s; /* default - not found */ 650 if (*s == '\0') 651 return 0; /* not found */ 652 653 if (isdigit(*s)) 654 return strtol(s, end, base); 655 656 /* 657 * find separator. '\\' escapes the next char. 658 */ 659 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 660 if (*s1 == '\\' && s1[1] != '\0') 661 s1++; 662 663 buf = safe_calloc(s1 - s + 1, 1); 664 665 /* 666 * copy into a buffer skipping backslashes 667 */ 668 for (p = s, i = 0; p != s1 ; p++) 669 if (*p != '\\') 670 buf[i++] = *p; 671 buf[i++] = '\0'; 672 673 if (proto == IPPROTO_ETHERTYPE) { 674 i = match_token(ether_types, buf); 675 free(buf); 676 if (i != -1) { /* found */ 677 *end = s1; 678 return i; 679 } 680 } else { 681 struct protoent *pe = NULL; 682 struct servent *se; 683 684 if (proto != 0) 685 pe = getprotobynumber(proto); 686 setservent(1); 687 se = getservbyname(buf, pe ? pe->p_name : NULL); 688 free(buf); 689 if (se != NULL) { 690 *end = s1; 691 return ntohs(se->s_port); 692 } 693 } 694 return 0; /* not found */ 695} 696 697/* 698 * Fill the body of the command with the list of port ranges. 699 */ 700static int 701fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 702{ 703 uint16_t a, b, *p = cmd->ports; 704 int i = 0; 705 char *s = av; 706 707 while (*s) { 708 a = strtoport(av, &s, 0, proto); 709 if (s == av) /* empty or invalid argument */ 710 return (0); 711 712 CHECK_LENGTH(cblen, i + 2); 713 714 switch (*s) { 715 case '-': /* a range */ 716 av = s + 1; 717 b = strtoport(av, &s, 0, proto); 718 /* Reject expressions like '1-abc' or '1-2-3'. */ 719 if (s == av || (*s != ',' && *s != '\0')) 720 return (0); 721 p[0] = a; 722 p[1] = b; 723 break; 724 case ',': /* comma separated list */ 725 case '\0': 726 p[0] = p[1] = a; 727 break; 728 default: 729 warnx("port list: invalid separator <%c> in <%s>", 730 *s, av); 731 return (0); 732 } 733 734 i++; 735 p += 2; 736 av = s + 1; 737 } 738 if (i > 0) { 739 if (i + 1 > F_LEN_MASK) 740 errx(EX_DATAERR, "too many ports/ranges\n"); 741 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 742 } 743 return (i); 744} 745 746/* 747 * Fill the body of the command with the list of DiffServ codepoints. 748 */ 749static void 750fill_dscp(ipfw_insn *cmd, char *av, int cblen) 751{ 752 uint32_t *low, *high; 753 char *s = av, *a; 754 int code; 755 756 cmd->opcode = O_DSCP; 757 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 758 759 CHECK_CMDLEN; 760 761 low = (uint32_t *)(cmd + 1); 762 high = low + 1; 763 764 *low = 0; 765 *high = 0; 766 767 while (s != NULL) { 768 a = strchr(s, ','); 769 770 if (a != NULL) 771 *a++ = '\0'; 772 773 if (isalpha(*s)) { 774 if ((code = match_token(f_ipdscp, s)) == -1) 775 errx(EX_DATAERR, "Unknown DSCP code"); 776 } else { 777 code = strtoul(s, NULL, 10); 778 if (code < 0 || code > 63) 779 errx(EX_DATAERR, "Invalid DSCP value"); 780 } 781 782 if (code > 32) 783 *high |= 1 << (code - 32); 784 else 785 *low |= 1 << code; 786 787 s = a; 788 } 789} 790 791static struct _s_x icmpcodes[] = { 792 { "net", ICMP_UNREACH_NET }, 793 { "host", ICMP_UNREACH_HOST }, 794 { "protocol", ICMP_UNREACH_PROTOCOL }, 795 { "port", ICMP_UNREACH_PORT }, 796 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 797 { "srcfail", ICMP_UNREACH_SRCFAIL }, 798 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 799 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 800 { "isolated", ICMP_UNREACH_ISOLATED }, 801 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 802 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 803 { "tosnet", ICMP_UNREACH_TOSNET }, 804 { "toshost", ICMP_UNREACH_TOSHOST }, 805 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 806 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 807 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 808 { NULL, 0 } 809}; 810 811static void 812fill_reject_code(u_short *codep, char *str) 813{ 814 int val; 815 char *s; 816 817 val = strtoul(str, &s, 0); 818 if (s == str || *s != '\0' || val >= 0x100) 819 val = match_token(icmpcodes, str); 820 if (val < 0) 821 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 822 *codep = val; 823 return; 824} 825 826static void 827print_reject_code(uint16_t code) 828{ 829 char const *s = match_value(icmpcodes, code); 830 831 if (s != NULL) 832 printf("unreach %s", s); 833 else 834 printf("unreach %u", code); 835} 836 837/* 838 * Returns the number of bits set (from left) in a contiguous bitmask, 839 * or -1 if the mask is not contiguous. 840 * XXX this needs a proper fix. 841 * This effectively works on masks in big-endian (network) format. 842 * when compiled on little endian architectures. 843 * 844 * First bit is bit 7 of the first byte -- note, for MAC addresses, 845 * the first bit on the wire is bit 0 of the first byte. 846 * len is the max length in bits. 847 */ 848int 849contigmask(uint8_t *p, int len) 850{ 851 int i, n; 852 853 for (i=0; i<len ; i++) 854 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 855 break; 856 for (n=i+1; n < len; n++) 857 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 858 return -1; /* mask not contiguous */ 859 return i; 860} 861 862/* 863 * print flags set/clear in the two bitmasks passed as parameters. 864 * There is a specialized check for f_tcpflags. 865 */ 866static void 867print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 868{ 869 char const *comma = ""; 870 int i; 871 uint8_t set = cmd->arg1 & 0xff; 872 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 873 874 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 875 printf(" setup"); 876 return; 877 } 878 879 printf(" %s ", name); 880 for (i=0; list[i].x != 0; i++) { 881 if (set & list[i].x) { 882 set &= ~list[i].x; 883 printf("%s%s", comma, list[i].s); 884 comma = ","; 885 } 886 if (clear & list[i].x) { 887 clear &= ~list[i].x; 888 printf("%s!%s", comma, list[i].s); 889 comma = ","; 890 } 891 } 892} 893 894/* 895 * Print the ip address contained in a command. 896 */ 897static void 898print_ip(ipfw_insn_ip *cmd, char const *s) 899{ 900 struct hostent *he = NULL; 901 uint32_t len = F_LEN((ipfw_insn *)cmd); 902 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 903 904 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 905 uint32_t d = a[1]; 906 const char *arg = "<invalid>"; 907 908 if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) 909 arg = match_value(rule_options, lookup_key[d]); 910 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "", 911 arg, cmd->o.arg1); 912 return; 913 } 914 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 915 916 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 917 printf("me"); 918 return; 919 } 920 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 921 cmd->o.opcode == O_IP_DST_LOOKUP) { 922 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 923 if (len == F_INSN_SIZE(ipfw_insn_u32)) 924 printf(",%u", *a); 925 printf(")"); 926 return; 927 } 928 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 929 uint32_t x, *map = (uint32_t *)&(cmd->mask); 930 int i, j; 931 char comma = '{'; 932 933 x = cmd->o.arg1 - 1; 934 x = htonl( ~x ); 935 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 936 printf("%s/%d", inet_ntoa(cmd->addr), 937 contigmask((uint8_t *)&x, 32)); 938 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 939 x &= 0xff; /* base */ 940 /* 941 * Print bits and ranges. 942 * Locate first bit set (i), then locate first bit unset (j). 943 * If we have 3+ consecutive bits set, then print them as a 944 * range, otherwise only print the initial bit and rescan. 945 */ 946 for (i=0; i < cmd->o.arg1; i++) 947 if (map[i/32] & (1<<(i & 31))) { 948 for (j=i+1; j < cmd->o.arg1; j++) 949 if (!(map[ j/32] & (1<<(j & 31)))) 950 break; 951 printf("%c%d", comma, i+x); 952 if (j>i+2) { /* range has at least 3 elements */ 953 printf("-%d", j-1+x); 954 i = j-1; 955 } 956 comma = ','; 957 } 958 printf("}"); 959 return; 960 } 961 /* 962 * len == 2 indicates a single IP, whereas lists of 1 or more 963 * addr/mask pairs have len = (2n+1). We convert len to n so we 964 * use that to count the number of entries. 965 */ 966 for (len = len / 2; len > 0; len--, a += 2) { 967 int mb = /* mask length */ 968 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 969 32 : contigmask((uint8_t *)&(a[1]), 32); 970 if (mb == 32 && co.do_resolv) 971 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 972 if (he != NULL) /* resolved to name */ 973 printf("%s", he->h_name); 974 else if (mb == 0) /* any */ 975 printf("any"); 976 else { /* numeric IP followed by some kind of mask */ 977 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 978 if (mb < 0) 979 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 980 else if (mb < 32) 981 printf("/%d", mb); 982 } 983 if (len > 1) 984 printf(","); 985 } 986} 987 988/* 989 * prints a MAC address/mask pair 990 */ 991static void 992print_mac(uint8_t *addr, uint8_t *mask) 993{ 994 int l = contigmask(mask, 48); 995 996 if (l == 0) 997 printf(" any"); 998 else { 999 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 1000 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1001 if (l == -1) 1002 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 1003 mask[0], mask[1], mask[2], 1004 mask[3], mask[4], mask[5]); 1005 else if (l < 48) 1006 printf("/%d", l); 1007 } 1008} 1009 1010static void 1011fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1012{ 1013 uint8_t type; 1014 1015 cmd->d[0] = 0; 1016 while (*av) { 1017 if (*av == ',') 1018 av++; 1019 1020 type = strtoul(av, &av, 0); 1021 1022 if (*av != ',' && *av != '\0') 1023 errx(EX_DATAERR, "invalid ICMP type"); 1024 1025 if (type > 31) 1026 errx(EX_DATAERR, "ICMP type out of range"); 1027 1028 cmd->d[0] |= 1 << type; 1029 } 1030 cmd->o.opcode = O_ICMPTYPE; 1031 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1032} 1033 1034static void 1035print_icmptypes(ipfw_insn_u32 *cmd) 1036{ 1037 int i; 1038 char sep= ' '; 1039 1040 printf(" icmptypes"); 1041 for (i = 0; i < 32; i++) { 1042 if ( (cmd->d[0] & (1 << (i))) == 0) 1043 continue; 1044 printf("%c%d", sep, i); 1045 sep = ','; 1046 } 1047} 1048 1049static void 1050print_dscp(ipfw_insn_u32 *cmd) 1051{ 1052 int i, c; 1053 uint32_t *v; 1054 char sep= ' '; 1055 const char *code; 1056 1057 printf(" dscp"); 1058 i = 0; 1059 c = 0; 1060 v = cmd->d; 1061 while (i < 64) { 1062 if (*v & (1 << i)) { 1063 if ((code = match_value(f_ipdscp, i)) != NULL) 1064 printf("%c%s", sep, code); 1065 else 1066 printf("%c%d", sep, i); 1067 sep = ','; 1068 } 1069 1070 if ((++i % 32) == 0) 1071 v++; 1072 } 1073} 1074 1075/* 1076 * show_ipfw() prints the body of an ipfw rule. 1077 * Because the standard rule has at least proto src_ip dst_ip, we use 1078 * a helper function to produce these entries if not provided explicitly. 1079 * The first argument is the list of fields we have, the second is 1080 * the list of fields we want to be printed. 1081 * 1082 * Special cases if we have provided a MAC header: 1083 * + if the rule does not contain IP addresses/ports, do not print them; 1084 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 1085 * 1086 * Once we have 'have_options', IP header fields are printed as options. 1087 */ 1088#define HAVE_PROTO 0x0001 1089#define HAVE_SRCIP 0x0002 1090#define HAVE_DSTIP 0x0004 1091#define HAVE_PROTO4 0x0008 1092#define HAVE_PROTO6 0x0010 1093#define HAVE_IP 0x0100 1094#define HAVE_OPTIONS 0x8000 1095 1096static void 1097show_prerequisites(int *flags, int want, int cmd __unused) 1098{ 1099 if (co.comment_only) 1100 return; 1101 if ( (*flags & HAVE_IP) == HAVE_IP) 1102 *flags |= HAVE_OPTIONS; 1103 1104 if ( !(*flags & HAVE_OPTIONS)) { 1105 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 1106 if ( (*flags & HAVE_PROTO4)) 1107 printf(" ip4"); 1108 else if ( (*flags & HAVE_PROTO6)) 1109 printf(" ip6"); 1110 else 1111 printf(" ip"); 1112 } 1113 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 1114 printf(" from any"); 1115 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 1116 printf(" to any"); 1117 } 1118 *flags |= want; 1119} 1120 1121static void 1122show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 1123{ 1124 static int twidth = 0; 1125 int l; 1126 ipfw_insn *cmd, *tagptr = NULL; 1127 const char *comment = NULL; /* ptr to comment if we have one */ 1128 int proto = 0; /* default */ 1129 int flags = 0; /* prerequisites */ 1130 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 1131 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 1132 int or_block = 0; /* we are in an or block */ 1133 uint32_t set_disable; 1134 1135 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 1136 1137 if (set_disable & (1 << rule->set)) { /* disabled */ 1138 if (!co.show_sets) 1139 return; 1140 else 1141 printf("# DISABLED "); 1142 } 1143 printf("%05u ", rule->rulenum); 1144 1145 if (pcwidth > 0 || bcwidth > 0) { 1146 pr_u64(&rule->pcnt, pcwidth); 1147 pr_u64(&rule->bcnt, bcwidth); 1148 } 1149 1150 if (co.do_time == 2) 1151 printf("%10u ", rule->timestamp); 1152 else if (co.do_time == 1) { 1153 char timestr[30]; 1154 time_t t = (time_t)0; 1155 1156 if (twidth == 0) { 1157 strcpy(timestr, ctime(&t)); 1158 *strchr(timestr, '\n') = '\0'; 1159 twidth = strlen(timestr); 1160 } 1161 if (rule->timestamp) { 1162 t = _long_to_time(rule->timestamp); 1163 1164 strcpy(timestr, ctime(&t)); 1165 *strchr(timestr, '\n') = '\0'; 1166 printf("%s ", timestr); 1167 } else { 1168 printf("%*s", twidth, " "); 1169 } 1170 } 1171 1172 if (co.show_sets) 1173 printf("set %d ", rule->set); 1174 1175 /* 1176 * print the optional "match probability" 1177 */ 1178 if (rule->cmd_len > 0) { 1179 cmd = rule->cmd ; 1180 if (cmd->opcode == O_PROB) { 1181 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1182 double d = 1.0 * p->d[0]; 1183 1184 d = (d / 0x7fffffff); 1185 printf("prob %f ", d); 1186 } 1187 } 1188 1189 /* 1190 * first print actions 1191 */ 1192 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1193 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1194 switch(cmd->opcode) { 1195 case O_CHECK_STATE: 1196 printf("check-state"); 1197 /* avoid printing anything else */ 1198 flags = HAVE_PROTO | HAVE_SRCIP | 1199 HAVE_DSTIP | HAVE_IP; 1200 break; 1201 1202 case O_ACCEPT: 1203 printf("allow"); 1204 break; 1205 1206 case O_COUNT: 1207 printf("count"); 1208 break; 1209 1210 case O_DENY: 1211 printf("deny"); 1212 break; 1213 1214 case O_REJECT: 1215 if (cmd->arg1 == ICMP_REJECT_RST) 1216 printf("reset"); 1217 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1218 printf("reject"); 1219 else 1220 print_reject_code(cmd->arg1); 1221 break; 1222 1223 case O_UNREACH6: 1224 if (cmd->arg1 == ICMP6_UNREACH_RST) 1225 printf("reset6"); 1226 else 1227 print_unreach6_code(cmd->arg1); 1228 break; 1229 1230 case O_SKIPTO: 1231 PRINT_UINT_ARG("skipto ", cmd->arg1); 1232 break; 1233 1234 case O_PIPE: 1235 PRINT_UINT_ARG("pipe ", cmd->arg1); 1236 break; 1237 1238 case O_QUEUE: 1239 PRINT_UINT_ARG("queue ", cmd->arg1); 1240 break; 1241 1242 case O_DIVERT: 1243 PRINT_UINT_ARG("divert ", cmd->arg1); 1244 break; 1245 1246 case O_TEE: 1247 PRINT_UINT_ARG("tee ", cmd->arg1); 1248 break; 1249 1250 case O_NETGRAPH: 1251 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1252 break; 1253 1254 case O_NGTEE: 1255 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1256 break; 1257 1258 case O_FORWARD_IP: 1259 { 1260 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1261 1262 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1263 printf("fwd tablearg"); 1264 } else { 1265 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1266 } 1267 if (s->sa.sin_port) 1268 printf(",%d", s->sa.sin_port); 1269 } 1270 break; 1271 1272 case O_FORWARD_IP6: 1273 { 1274 char buf[4 + INET6_ADDRSTRLEN + 1]; 1275 ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd; 1276 1277 printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr, 1278 buf, sizeof(buf))); 1279 if (s->sa.sin6_port) 1280 printf(",%d", s->sa.sin6_port); 1281 } 1282 break; 1283 1284 case O_LOG: /* O_LOG is printed last */ 1285 logptr = (ipfw_insn_log *)cmd; 1286 break; 1287 1288 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1289 altqptr = (ipfw_insn_altq *)cmd; 1290 break; 1291 1292 case O_TAG: 1293 tagptr = cmd; 1294 break; 1295 1296 case O_NAT: 1297 if (cmd->arg1 != 0) 1298 PRINT_UINT_ARG("nat ", cmd->arg1); 1299 else 1300 printf("nat global"); 1301 break; 1302 1303 case O_SETFIB: 1304 PRINT_UINT_ARG("setfib ", cmd->arg1); 1305 break; 1306 1307 case O_SETDSCP: 1308 { 1309 const char *code; 1310 1311 if ((code = match_value(f_ipdscp, cmd->arg1)) != NULL) 1312 printf("setdscp %s", code); 1313 else 1314 PRINT_UINT_ARG("setdscp ", cmd->arg1); 1315 } 1316 break; 1317 1318 case O_REASS: 1319 printf("reass"); 1320 break; 1321 1322 case O_CALLRETURN: 1323 if (cmd->len & F_NOT) 1324 printf("return"); 1325 else 1326 PRINT_UINT_ARG("call ", cmd->arg1); 1327 break; 1328 1329 default: 1330 printf("** unrecognized action %d len %d ", 1331 cmd->opcode, cmd->len); 1332 } 1333 } 1334 if (logptr) { 1335 if (logptr->max_log > 0) 1336 printf(" log logamount %d", logptr->max_log); 1337 else 1338 printf(" log"); 1339 } 1340#ifndef NO_ALTQ 1341 if (altqptr) { 1342 print_altq_cmd(altqptr); 1343 } 1344#endif 1345 if (tagptr) { 1346 if (tagptr->len & F_NOT) 1347 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1348 else 1349 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1350 } 1351 1352 /* 1353 * then print the body. 1354 */ 1355 for (l = rule->act_ofs, cmd = rule->cmd ; 1356 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1357 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1358 continue; 1359 if (cmd->opcode == O_IP4) { 1360 flags |= HAVE_PROTO4; 1361 break; 1362 } else if (cmd->opcode == O_IP6) { 1363 flags |= HAVE_PROTO6; 1364 break; 1365 } 1366 } 1367 if (rule->_pad & 1) { /* empty rules before options */ 1368 if (!co.do_compact) { 1369 show_prerequisites(&flags, HAVE_PROTO, 0); 1370 printf(" from any to any"); 1371 } 1372 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | 1373 HAVE_SRCIP | HAVE_DSTIP; 1374 } 1375 1376 if (co.comment_only) 1377 comment = "..."; 1378 1379 for (l = rule->act_ofs, cmd = rule->cmd ; 1380 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1381 /* useful alias */ 1382 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1383 1384 if (co.comment_only) { 1385 if (cmd->opcode != O_NOP) 1386 continue; 1387 printf(" // %s\n", (char *)(cmd + 1)); 1388 return; 1389 } 1390 1391 show_prerequisites(&flags, 0, cmd->opcode); 1392 1393 switch(cmd->opcode) { 1394 case O_PROB: 1395 break; /* done already */ 1396 1397 case O_PROBE_STATE: 1398 break; /* no need to print anything here */ 1399 1400 case O_IP_SRC: 1401 case O_IP_SRC_LOOKUP: 1402 case O_IP_SRC_MASK: 1403 case O_IP_SRC_ME: 1404 case O_IP_SRC_SET: 1405 show_prerequisites(&flags, HAVE_PROTO, 0); 1406 if (!(flags & HAVE_SRCIP)) 1407 printf(" from"); 1408 if ((cmd->len & F_OR) && !or_block) 1409 printf(" {"); 1410 print_ip((ipfw_insn_ip *)cmd, 1411 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1412 flags |= HAVE_SRCIP; 1413 break; 1414 1415 case O_IP_DST: 1416 case O_IP_DST_LOOKUP: 1417 case O_IP_DST_MASK: 1418 case O_IP_DST_ME: 1419 case O_IP_DST_SET: 1420 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1421 if (!(flags & HAVE_DSTIP)) 1422 printf(" to"); 1423 if ((cmd->len & F_OR) && !or_block) 1424 printf(" {"); 1425 print_ip((ipfw_insn_ip *)cmd, 1426 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1427 flags |= HAVE_DSTIP; 1428 break; 1429 1430 case O_IP6_SRC: 1431 case O_IP6_SRC_MASK: 1432 case O_IP6_SRC_ME: 1433 show_prerequisites(&flags, HAVE_PROTO, 0); 1434 if (!(flags & HAVE_SRCIP)) 1435 printf(" from"); 1436 if ((cmd->len & F_OR) && !or_block) 1437 printf(" {"); 1438 print_ip6((ipfw_insn_ip6 *)cmd, 1439 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1440 flags |= HAVE_SRCIP | HAVE_PROTO; 1441 break; 1442 1443 case O_IP6_DST: 1444 case O_IP6_DST_MASK: 1445 case O_IP6_DST_ME: 1446 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1447 if (!(flags & HAVE_DSTIP)) 1448 printf(" to"); 1449 if ((cmd->len & F_OR) && !or_block) 1450 printf(" {"); 1451 print_ip6((ipfw_insn_ip6 *)cmd, 1452 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1453 flags |= HAVE_DSTIP; 1454 break; 1455 1456 case O_FLOW6ID: 1457 print_flow6id( (ipfw_insn_u32 *) cmd ); 1458 flags |= HAVE_OPTIONS; 1459 break; 1460 1461 case O_IP_DSTPORT: 1462 show_prerequisites(&flags, 1463 HAVE_PROTO | HAVE_SRCIP | 1464 HAVE_DSTIP | HAVE_IP, 0); 1465 case O_IP_SRCPORT: 1466 if (flags & HAVE_DSTIP) 1467 flags |= HAVE_IP; 1468 show_prerequisites(&flags, 1469 HAVE_PROTO | HAVE_SRCIP, 0); 1470 if ((cmd->len & F_OR) && !or_block) 1471 printf(" {"); 1472 if (cmd->len & F_NOT) 1473 printf(" not"); 1474 print_newports((ipfw_insn_u16 *)cmd, proto, 1475 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1476 break; 1477 1478 case O_PROTO: { 1479 struct protoent *pe = NULL; 1480 1481 if ((cmd->len & F_OR) && !or_block) 1482 printf(" {"); 1483 if (cmd->len & F_NOT) 1484 printf(" not"); 1485 proto = cmd->arg1; 1486 pe = getprotobynumber(cmd->arg1); 1487 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1488 !(flags & HAVE_PROTO)) 1489 show_prerequisites(&flags, 1490 HAVE_PROTO | HAVE_IP | HAVE_SRCIP | 1491 HAVE_DSTIP | HAVE_OPTIONS, 0); 1492 if (flags & HAVE_OPTIONS) 1493 printf(" proto"); 1494 if (pe) 1495 printf(" %s", pe->p_name); 1496 else 1497 printf(" %u", cmd->arg1); 1498 } 1499 flags |= HAVE_PROTO; 1500 break; 1501 1502 default: /*options ... */ 1503 if (!(cmd->len & (F_OR|F_NOT))) 1504 if (((cmd->opcode == O_IP6) && 1505 (flags & HAVE_PROTO6)) || 1506 ((cmd->opcode == O_IP4) && 1507 (flags & HAVE_PROTO4))) 1508 break; 1509 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | 1510 HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); 1511 if ((cmd->len & F_OR) && !or_block) 1512 printf(" {"); 1513 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1514 printf(" not"); 1515 switch(cmd->opcode) { 1516 case O_MACADDR2: { 1517 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1518 1519 printf(" MAC"); 1520 print_mac(m->addr, m->mask); 1521 print_mac(m->addr + 6, m->mask + 6); 1522 } 1523 break; 1524 1525 case O_MAC_TYPE: 1526 print_newports((ipfw_insn_u16 *)cmd, 1527 IPPROTO_ETHERTYPE, cmd->opcode); 1528 break; 1529 1530 1531 case O_FRAG: 1532 printf(" frag"); 1533 break; 1534 1535 case O_FIB: 1536 printf(" fib %u", cmd->arg1 ); 1537 break; 1538 case O_SOCKARG: 1539 printf(" sockarg"); 1540 break; 1541 1542 case O_IN: 1543 printf(cmd->len & F_NOT ? " out" : " in"); 1544 break; 1545 1546 case O_DIVERTED: 1547 switch (cmd->arg1) { 1548 case 3: 1549 printf(" diverted"); 1550 break; 1551 case 1: 1552 printf(" diverted-loopback"); 1553 break; 1554 case 2: 1555 printf(" diverted-output"); 1556 break; 1557 default: 1558 printf(" diverted-?<%u>", cmd->arg1); 1559 break; 1560 } 1561 break; 1562 1563 case O_LAYER2: 1564 printf(" layer2"); 1565 break; 1566 case O_XMIT: 1567 case O_RECV: 1568 case O_VIA: 1569 { 1570 char const *s; 1571 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1572 1573 if (cmd->opcode == O_XMIT) 1574 s = "xmit"; 1575 else if (cmd->opcode == O_RECV) 1576 s = "recv"; 1577 else /* if (cmd->opcode == O_VIA) */ 1578 s = "via"; 1579 if (cmdif->name[0] == '\0') 1580 printf(" %s %s", s, 1581 inet_ntoa(cmdif->p.ip)); 1582 else if (cmdif->name[0] == '\1') /* interface table */ 1583 printf(" %s table(%d)", s, cmdif->p.glob); 1584 else 1585 printf(" %s %s", s, cmdif->name); 1586 1587 break; 1588 } 1589 case O_IPID: 1590 if (F_LEN(cmd) == 1) 1591 printf(" ipid %u", cmd->arg1 ); 1592 else 1593 print_newports((ipfw_insn_u16 *)cmd, 0, 1594 O_IPID); 1595 break; 1596 1597 case O_IPTTL: 1598 if (F_LEN(cmd) == 1) 1599 printf(" ipttl %u", cmd->arg1 ); 1600 else 1601 print_newports((ipfw_insn_u16 *)cmd, 0, 1602 O_IPTTL); 1603 break; 1604 1605 case O_IPVER: 1606 printf(" ipver %u", cmd->arg1 ); 1607 break; 1608 1609 case O_IPPRECEDENCE: 1610 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1611 break; 1612 1613 case O_DSCP: 1614 print_dscp((ipfw_insn_u32 *)cmd); 1615 break; 1616 1617 case O_IPLEN: 1618 if (F_LEN(cmd) == 1) 1619 printf(" iplen %u", cmd->arg1 ); 1620 else 1621 print_newports((ipfw_insn_u16 *)cmd, 0, 1622 O_IPLEN); 1623 break; 1624 1625 case O_IPOPT: 1626 print_flags("ipoptions", cmd, f_ipopts); 1627 break; 1628 1629 case O_IPTOS: 1630 print_flags("iptos", cmd, f_iptos); 1631 break; 1632 1633 case O_ICMPTYPE: 1634 print_icmptypes((ipfw_insn_u32 *)cmd); 1635 break; 1636 1637 case O_ESTAB: 1638 printf(" established"); 1639 break; 1640 1641 case O_TCPDATALEN: 1642 if (F_LEN(cmd) == 1) 1643 printf(" tcpdatalen %u", cmd->arg1 ); 1644 else 1645 print_newports((ipfw_insn_u16 *)cmd, 0, 1646 O_TCPDATALEN); 1647 break; 1648 1649 case O_TCPFLAGS: 1650 print_flags("tcpflags", cmd, f_tcpflags); 1651 break; 1652 1653 case O_TCPOPTS: 1654 print_flags("tcpoptions", cmd, f_tcpopts); 1655 break; 1656 1657 case O_TCPWIN: 1658 if (F_LEN(cmd) == 1) 1659 printf(" tcpwin %u", cmd->arg1); 1660 else 1661 print_newports((ipfw_insn_u16 *)cmd, 0, 1662 O_TCPWIN); 1663 break; 1664 1665 case O_TCPACK: 1666 printf(" tcpack %d", ntohl(cmd32->d[0])); 1667 break; 1668 1669 case O_TCPSEQ: 1670 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1671 break; 1672 1673 case O_UID: 1674 { 1675 struct passwd *pwd = getpwuid(cmd32->d[0]); 1676 1677 if (pwd) 1678 printf(" uid %s", pwd->pw_name); 1679 else 1680 printf(" uid %u", cmd32->d[0]); 1681 } 1682 break; 1683 1684 case O_GID: 1685 { 1686 struct group *grp = getgrgid(cmd32->d[0]); 1687 1688 if (grp) 1689 printf(" gid %s", grp->gr_name); 1690 else 1691 printf(" gid %u", cmd32->d[0]); 1692 } 1693 break; 1694 1695 case O_JAIL: 1696 printf(" jail %d", cmd32->d[0]); 1697 break; 1698 1699 case O_VERREVPATH: 1700 printf(" verrevpath"); 1701 break; 1702 1703 case O_VERSRCREACH: 1704 printf(" versrcreach"); 1705 break; 1706 1707 case O_ANTISPOOF: 1708 printf(" antispoof"); 1709 break; 1710 1711 case O_IPSEC: 1712 printf(" ipsec"); 1713 break; 1714 1715 case O_NOP: 1716 comment = (char *)(cmd + 1); 1717 break; 1718 1719 case O_KEEP_STATE: 1720 printf(" keep-state"); 1721 break; 1722 1723 case O_LIMIT: { 1724 struct _s_x *p = limit_masks; 1725 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1726 uint8_t x = c->limit_mask; 1727 char const *comma = " "; 1728 1729 printf(" limit"); 1730 for (; p->x != 0 ; p++) 1731 if ((x & p->x) == p->x) { 1732 x &= ~p->x; 1733 printf("%s%s", comma, p->s); 1734 comma = ","; 1735 } 1736 PRINT_UINT_ARG(" ", c->conn_limit); 1737 break; 1738 } 1739 1740 case O_IP6: 1741 printf(" ip6"); 1742 break; 1743 1744 case O_IP4: 1745 printf(" ip4"); 1746 break; 1747 1748 case O_ICMP6TYPE: 1749 print_icmp6types((ipfw_insn_u32 *)cmd); 1750 break; 1751 1752 case O_EXT_HDR: 1753 print_ext6hdr( (ipfw_insn *) cmd ); 1754 break; 1755 1756 case O_TAGGED: 1757 if (F_LEN(cmd) == 1) 1758 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1759 else 1760 print_newports((ipfw_insn_u16 *)cmd, 0, 1761 O_TAGGED); 1762 break; 1763 1764 default: 1765 printf(" [opcode %d len %d]", 1766 cmd->opcode, cmd->len); 1767 } 1768 } 1769 if (cmd->len & F_OR) { 1770 printf(" or"); 1771 or_block = 1; 1772 } else if (or_block) { 1773 printf(" }"); 1774 or_block = 0; 1775 } 1776 } 1777 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP 1778 | HAVE_IP, 0); 1779 if (comment) 1780 printf(" // %s", comment); 1781 printf("\n"); 1782} 1783 1784static void 1785show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1786{ 1787 struct protoent *pe; 1788 struct in_addr a; 1789 uint16_t rulenum; 1790 char buf[INET6_ADDRSTRLEN]; 1791 1792 if (!co.do_expired) { 1793 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1794 return; 1795 } 1796 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1797 printf("%05d", rulenum); 1798 if (pcwidth > 0 || bcwidth > 0) { 1799 printf(" "); 1800 pr_u64(&d->pcnt, pcwidth); 1801 pr_u64(&d->bcnt, bcwidth); 1802 printf("(%ds)", d->expire); 1803 } 1804 switch (d->dyn_type) { 1805 case O_LIMIT_PARENT: 1806 printf(" PARENT %d", d->count); 1807 break; 1808 case O_LIMIT: 1809 printf(" LIMIT"); 1810 break; 1811 case O_KEEP_STATE: /* bidir, no mask */ 1812 printf(" STATE"); 1813 break; 1814 } 1815 1816 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1817 printf(" %s", pe->p_name); 1818 else 1819 printf(" proto %u", d->id.proto); 1820 1821 if (d->id.addr_type == 4) { 1822 a.s_addr = htonl(d->id.src_ip); 1823 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1824 1825 a.s_addr = htonl(d->id.dst_ip); 1826 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1827 } else if (d->id.addr_type == 6) { 1828 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1829 sizeof(buf)), d->id.src_port); 1830 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1831 sizeof(buf)), d->id.dst_port); 1832 } else 1833 printf(" UNKNOWN <-> UNKNOWN\n"); 1834 1835 printf("\n"); 1836} 1837 1838/* 1839 * This one handles all set-related commands 1840 * ipfw set { show | enable | disable } 1841 * ipfw set swap X Y 1842 * ipfw set move X to Y 1843 * ipfw set move rule X to Y 1844 */ 1845void 1846ipfw_sets_handler(char *av[]) 1847{ 1848 uint32_t set_disable, masks[2]; 1849 int i, nbytes; 1850 uint16_t rulenum; 1851 uint8_t cmd, new_set; 1852 1853 av++; 1854 1855 if (av[0] == NULL) 1856 errx(EX_USAGE, "set needs command"); 1857 if (_substrcmp(*av, "show") == 0) { 1858 void *data = NULL; 1859 char const *msg; 1860 int nalloc; 1861 1862 nalloc = nbytes = sizeof(struct ip_fw); 1863 while (nbytes >= nalloc) { 1864 if (data) 1865 free(data); 1866 nalloc = nalloc * 2 + 200; 1867 nbytes = nalloc; 1868 data = safe_calloc(1, nbytes); 1869 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1870 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1871 } 1872 1873 bcopy(&((struct ip_fw *)data)->next_rule, 1874 &set_disable, sizeof(set_disable)); 1875 1876 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1877 if ((set_disable & (1<<i))) { 1878 printf("%s %d", msg, i); 1879 msg = ""; 1880 } 1881 msg = (set_disable) ? " enable" : "enable"; 1882 for (i = 0; i < RESVD_SET; i++) 1883 if (!(set_disable & (1<<i))) { 1884 printf("%s %d", msg, i); 1885 msg = ""; 1886 } 1887 printf("\n"); 1888 } else if (_substrcmp(*av, "swap") == 0) { 1889 av++; 1890 if ( av[0] == NULL || av[1] == NULL ) 1891 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1892 rulenum = atoi(av[0]); 1893 new_set = atoi(av[1]); 1894 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1895 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1896 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1897 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1898 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1899 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1900 } else if (_substrcmp(*av, "move") == 0) { 1901 av++; 1902 if (av[0] && _substrcmp(*av, "rule") == 0) { 1903 cmd = 2; 1904 av++; 1905 } else 1906 cmd = 3; 1907 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 1908 av[3] != NULL || _substrcmp(av[1], "to") != 0) 1909 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1910 rulenum = atoi(av[0]); 1911 new_set = atoi(av[2]); 1912 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1913 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1914 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1915 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1916 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1917 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1918 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1919 } else if (_substrcmp(*av, "disable") == 0 || 1920 _substrcmp(*av, "enable") == 0 ) { 1921 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1922 1923 av++; 1924 masks[0] = masks[1] = 0; 1925 1926 while (av[0]) { 1927 if (isdigit(**av)) { 1928 i = atoi(*av); 1929 if (i < 0 || i > RESVD_SET) 1930 errx(EX_DATAERR, 1931 "invalid set number %d\n", i); 1932 masks[which] |= (1<<i); 1933 } else if (_substrcmp(*av, "disable") == 0) 1934 which = 0; 1935 else if (_substrcmp(*av, "enable") == 0) 1936 which = 1; 1937 else 1938 errx(EX_DATAERR, 1939 "invalid set command %s\n", *av); 1940 av++; 1941 } 1942 if ( (masks[0] & masks[1]) != 0 ) 1943 errx(EX_DATAERR, 1944 "cannot enable and disable the same set\n"); 1945 1946 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1947 if (i) 1948 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1949 } else 1950 errx(EX_USAGE, "invalid set command %s\n", *av); 1951} 1952 1953void 1954ipfw_sysctl_handler(char *av[], int which) 1955{ 1956 av++; 1957 1958 if (av[0] == NULL) { 1959 warnx("missing keyword to enable/disable\n"); 1960 } else if (_substrcmp(*av, "firewall") == 0) { 1961 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1962 &which, sizeof(which)); 1963 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 1964 &which, sizeof(which)); 1965 } else if (_substrcmp(*av, "one_pass") == 0) { 1966 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1967 &which, sizeof(which)); 1968 } else if (_substrcmp(*av, "debug") == 0) { 1969 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1970 &which, sizeof(which)); 1971 } else if (_substrcmp(*av, "verbose") == 0) { 1972 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1973 &which, sizeof(which)); 1974 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1975 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1976 &which, sizeof(which)); 1977#ifndef NO_ALTQ 1978 } else if (_substrcmp(*av, "altq") == 0) { 1979 altq_set_enabled(which); 1980#endif 1981 } else { 1982 warnx("unrecognize enable/disable keyword: %s\n", *av); 1983 } 1984} 1985 1986void 1987ipfw_list(int ac, char *av[], int show_counters) 1988{ 1989 struct ip_fw *r; 1990 ipfw_dyn_rule *dynrules, *d; 1991 1992#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1993 char *lim; 1994 void *data = NULL; 1995 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1996 int exitval = EX_OK; 1997 int lac; 1998 char **lav; 1999 u_long rnum, last; 2000 char *endptr; 2001 int seen = 0; 2002 uint8_t set; 2003 2004 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 2005 int nalloc = 1024; /* start somewhere... */ 2006 2007 last = 0; 2008 2009 if (co.test_only) { 2010 fprintf(stderr, "Testing only, list disabled\n"); 2011 return; 2012 } 2013 if (co.do_pipe) { 2014 dummynet_list(ac, av, show_counters); 2015 return; 2016 } 2017 2018 ac--; 2019 av++; 2020 2021 /* get rules or pipes from kernel, resizing array as necessary */ 2022 nbytes = nalloc; 2023 2024 while (nbytes >= nalloc) { 2025 nalloc = nalloc * 2 + 200; 2026 nbytes = nalloc; 2027 data = safe_realloc(data, nbytes); 2028 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 2029 err(EX_OSERR, "getsockopt(IP_%s_GET)", 2030 co.do_pipe ? "DUMMYNET" : "FW"); 2031 } 2032 2033 /* 2034 * Count static rules. They have variable size so we 2035 * need to scan the list to count them. 2036 */ 2037 for (nstat = 1, r = data, lim = (char *)data + nbytes; 2038 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 2039 ++nstat, r = NEXT(r) ) 2040 ; /* nothing */ 2041 2042 /* 2043 * Count dynamic rules. This is easier as they have 2044 * fixed size. 2045 */ 2046 r = NEXT(r); 2047 dynrules = (ipfw_dyn_rule *)r ; 2048 n = (char *)r - (char *)data; 2049 ndyn = (nbytes - n) / sizeof *dynrules; 2050 2051 /* if showing stats, figure out column widths ahead of time */ 2052 bcwidth = pcwidth = 0; 2053 if (show_counters) { 2054 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 2055 /* skip rules from another set */ 2056 if (co.use_set && r->set != co.use_set - 1) 2057 continue; 2058 2059 /* packet counter */ 2060 width = pr_u64(&r->pcnt, 0); 2061 if (width > pcwidth) 2062 pcwidth = width; 2063 2064 /* byte counter */ 2065 width = pr_u64(&r->bcnt, 0); 2066 if (width > bcwidth) 2067 bcwidth = width; 2068 } 2069 } 2070 if (co.do_dynamic && ndyn) { 2071 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2072 if (co.use_set) { 2073 /* skip rules from another set */ 2074 bcopy((char *)&d->rule + sizeof(uint16_t), 2075 &set, sizeof(uint8_t)); 2076 if (set != co.use_set - 1) 2077 continue; 2078 } 2079 width = pr_u64(&d->pcnt, 0); 2080 if (width > pcwidth) 2081 pcwidth = width; 2082 2083 width = pr_u64(&d->bcnt, 0); 2084 if (width > bcwidth) 2085 bcwidth = width; 2086 } 2087 } 2088 /* if no rule numbers were specified, list all rules */ 2089 if (ac == 0) { 2090 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 2091 if (co.use_set && r->set != co.use_set - 1) 2092 continue; 2093 show_ipfw(r, pcwidth, bcwidth); 2094 } 2095 2096 if (co.do_dynamic && ndyn) { 2097 printf("## Dynamic rules (%d):\n", ndyn); 2098 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2099 if (co.use_set) { 2100 bcopy((char *)&d->rule + sizeof(uint16_t), 2101 &set, sizeof(uint8_t)); 2102 if (set != co.use_set - 1) 2103 continue; 2104 } 2105 show_dyn_ipfw(d, pcwidth, bcwidth); 2106 } 2107 } 2108 goto done; 2109 } 2110 2111 /* display specific rules requested on command line */ 2112 2113 for (lac = ac, lav = av; lac != 0; lac--) { 2114 /* convert command line rule # */ 2115 last = rnum = strtoul(*lav++, &endptr, 10); 2116 if (*endptr == '-') 2117 last = strtoul(endptr+1, &endptr, 10); 2118 if (*endptr) { 2119 exitval = EX_USAGE; 2120 warnx("invalid rule number: %s", *(lav - 1)); 2121 continue; 2122 } 2123 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 2124 if (r->rulenum > last) 2125 break; 2126 if (co.use_set && r->set != co.use_set - 1) 2127 continue; 2128 if (r->rulenum >= rnum && r->rulenum <= last) { 2129 show_ipfw(r, pcwidth, bcwidth); 2130 seen = 1; 2131 } 2132 } 2133 if (!seen) { 2134 /* give precedence to other error(s) */ 2135 if (exitval == EX_OK) 2136 exitval = EX_UNAVAILABLE; 2137 warnx("rule %lu does not exist", rnum); 2138 } 2139 } 2140 2141 if (co.do_dynamic && ndyn) { 2142 printf("## Dynamic rules:\n"); 2143 for (lac = ac, lav = av; lac != 0; lac--) { 2144 last = rnum = strtoul(*lav++, &endptr, 10); 2145 if (*endptr == '-') 2146 last = strtoul(endptr+1, &endptr, 10); 2147 if (*endptr) 2148 /* already warned */ 2149 continue; 2150 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2151 uint16_t rulenum; 2152 2153 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2154 if (rulenum > rnum) 2155 break; 2156 if (co.use_set) { 2157 bcopy((char *)&d->rule + sizeof(uint16_t), 2158 &set, sizeof(uint8_t)); 2159 if (set != co.use_set - 1) 2160 continue; 2161 } 2162 if (r->rulenum >= rnum && r->rulenum <= last) 2163 show_dyn_ipfw(d, pcwidth, bcwidth); 2164 } 2165 } 2166 } 2167 2168 ac = 0; 2169 2170done: 2171 free(data); 2172 2173 if (exitval != EX_OK) 2174 exit(exitval); 2175#undef NEXT 2176} 2177 2178static int 2179lookup_host (char *host, struct in_addr *ipaddr) 2180{ 2181 struct hostent *he; 2182 2183 if (!inet_aton(host, ipaddr)) { 2184 if ((he = gethostbyname(host)) == NULL) 2185 return(-1); 2186 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 2187 } 2188 return(0); 2189} 2190 2191/* 2192 * fills the addr and mask fields in the instruction as appropriate from av. 2193 * Update length as appropriate. 2194 * The following formats are allowed: 2195 * me returns O_IP_*_ME 2196 * 1.2.3.4 single IP address 2197 * 1.2.3.4:5.6.7.8 address:mask 2198 * 1.2.3.4/24 address/mask 2199 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 2200 * We can have multiple comma-separated address/mask entries. 2201 */ 2202static void 2203fill_ip(ipfw_insn_ip *cmd, char *av, int cblen) 2204{ 2205 int len = 0; 2206 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2207 uint32_t tables_max; 2208 2209 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 2210 2211 if (_substrcmp(av, "any") == 0) 2212 return; 2213 2214 if (_substrcmp(av, "me") == 0) { 2215 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2216 return; 2217 } 2218 2219 if (strncmp(av, "table(", 6) == 0) { 2220 char *p = strchr(av + 6, ','); 2221 2222 if (p) 2223 *p++ = '\0'; 2224 cmd->o.opcode = O_IP_DST_LOOKUP; 2225 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 2226 tables_max = ipfw_get_tables_max(); 2227 if (cmd->o.arg1 > tables_max) 2228 errx(EX_USAGE, "The table number exceeds the maximum " 2229 "allowed value (%u)", tables_max - 1); 2230 if (p) { 2231 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2232 d[0] = strtoul(p, NULL, 0); 2233 } else 2234 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2235 return; 2236 } 2237 2238 while (av) { 2239 /* 2240 * After the address we can have '/' or ':' indicating a mask, 2241 * ',' indicating another address follows, '{' indicating a 2242 * set of addresses of unspecified size. 2243 */ 2244 char *t = NULL, *p = strpbrk(av, "/:,{"); 2245 int masklen; 2246 char md, nd = '\0'; 2247 2248 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len); 2249 2250 if (p) { 2251 md = *p; 2252 *p++ = '\0'; 2253 if ((t = strpbrk(p, ",{")) != NULL) { 2254 nd = *t; 2255 *t = '\0'; 2256 } 2257 } else 2258 md = '\0'; 2259 2260 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2261 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2262 switch (md) { 2263 case ':': 2264 if (!inet_aton(p, (struct in_addr *)&d[1])) 2265 errx(EX_DATAERR, "bad netmask ``%s''", p); 2266 break; 2267 case '/': 2268 masklen = atoi(p); 2269 if (masklen == 0) 2270 d[1] = htonl(0); /* mask */ 2271 else if (masklen > 32) 2272 errx(EX_DATAERR, "bad width ``%s''", p); 2273 else 2274 d[1] = htonl(~0 << (32 - masklen)); 2275 break; 2276 case '{': /* no mask, assume /24 and put back the '{' */ 2277 d[1] = htonl(~0 << (32 - 24)); 2278 *(--p) = md; 2279 break; 2280 2281 case ',': /* single address plus continuation */ 2282 *(--p) = md; 2283 /* FALLTHROUGH */ 2284 case 0: /* initialization value */ 2285 default: 2286 d[1] = htonl(~0); /* force /32 */ 2287 break; 2288 } 2289 d[0] &= d[1]; /* mask base address with mask */ 2290 if (t) 2291 *t = nd; 2292 /* find next separator */ 2293 if (p) 2294 p = strpbrk(p, ",{"); 2295 if (p && *p == '{') { 2296 /* 2297 * We have a set of addresses. They are stored as follows: 2298 * arg1 is the set size (powers of 2, 2..256) 2299 * addr is the base address IN HOST FORMAT 2300 * mask.. is an array of arg1 bits (rounded up to 2301 * the next multiple of 32) with bits set 2302 * for each host in the map. 2303 */ 2304 uint32_t *map = (uint32_t *)&cmd->mask; 2305 int low, high; 2306 int i = contigmask((uint8_t *)&(d[1]), 32); 2307 2308 if (len > 0) 2309 errx(EX_DATAERR, "address set cannot be in a list"); 2310 if (i < 24 || i > 31) 2311 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2312 cmd->o.arg1 = 1<<(32-i); /* map length */ 2313 d[0] = ntohl(d[0]); /* base addr in host format */ 2314 cmd->o.opcode = O_IP_DST_SET; /* default */ 2315 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2316 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2317 map[i] = 0; /* clear map */ 2318 2319 av = p + 1; 2320 low = d[0] & 0xff; 2321 high = low + cmd->o.arg1 - 1; 2322 /* 2323 * Here, i stores the previous value when we specify a range 2324 * of addresses within a mask, e.g. 45-63. i = -1 means we 2325 * have no previous value. 2326 */ 2327 i = -1; /* previous value in a range */ 2328 while (isdigit(*av)) { 2329 char *s; 2330 int a = strtol(av, &s, 0); 2331 2332 if (s == av) { /* no parameter */ 2333 if (*av != '}') 2334 errx(EX_DATAERR, "set not closed\n"); 2335 if (i != -1) 2336 errx(EX_DATAERR, "incomplete range %d-", i); 2337 break; 2338 } 2339 if (a < low || a > high) 2340 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2341 a, low, high); 2342 a -= low; 2343 if (i == -1) /* no previous in range */ 2344 i = a; 2345 else { /* check that range is valid */ 2346 if (i > a) 2347 errx(EX_DATAERR, "invalid range %d-%d", 2348 i+low, a+low); 2349 if (*s == '-') 2350 errx(EX_DATAERR, "double '-' in range"); 2351 } 2352 for (; i <= a; i++) 2353 map[i/32] |= 1<<(i & 31); 2354 i = -1; 2355 if (*s == '-') 2356 i = a; 2357 else if (*s == '}') 2358 break; 2359 av = s+1; 2360 } 2361 return; 2362 } 2363 av = p; 2364 if (av) /* then *av must be a ',' */ 2365 av++; 2366 2367 /* Check this entry */ 2368 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2369 /* 2370 * 'any' turns the entire list into a NOP. 2371 * 'not any' never matches, so it is removed from the 2372 * list unless it is the only item, in which case we 2373 * report an error. 2374 */ 2375 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2376 if (av == NULL && len == 0) /* only this entry */ 2377 errx(EX_DATAERR, "not any never matches"); 2378 } 2379 /* else do nothing and skip this entry */ 2380 return; 2381 } 2382 /* A single IP can be stored in an optimized format */ 2383 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2384 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2385 return; 2386 } 2387 len += 2; /* two words... */ 2388 d += 2; 2389 } /* end while */ 2390 if (len + 1 > F_LEN_MASK) 2391 errx(EX_DATAERR, "address list too long"); 2392 cmd->o.len |= len+1; 2393} 2394 2395 2396/* n2mask sets n bits of the mask */ 2397void 2398n2mask(struct in6_addr *mask, int n) 2399{ 2400 static int minimask[9] = 2401 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2402 u_char *p; 2403 2404 memset(mask, 0, sizeof(struct in6_addr)); 2405 p = (u_char *) mask; 2406 for (; n > 0; p++, n -= 8) { 2407 if (n >= 8) 2408 *p = 0xff; 2409 else 2410 *p = minimask[n]; 2411 } 2412 return; 2413} 2414 2415/* 2416 * helper function to process a set of flags and set bits in the 2417 * appropriate masks. 2418 */ 2419static void 2420fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2421 struct _s_x *flags, char *p) 2422{ 2423 uint8_t set=0, clear=0; 2424 2425 while (p && *p) { 2426 char *q; /* points to the separator */ 2427 int val; 2428 uint8_t *which; /* mask we are working on */ 2429 2430 if (*p == '!') { 2431 p++; 2432 which = &clear; 2433 } else 2434 which = &set; 2435 q = strchr(p, ','); 2436 if (q) 2437 *q++ = '\0'; 2438 val = match_token(flags, p); 2439 if (val <= 0) 2440 errx(EX_DATAERR, "invalid flag %s", p); 2441 *which |= (uint8_t)val; 2442 p = q; 2443 } 2444 cmd->opcode = opcode; 2445 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2446 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2447} 2448 2449 2450void 2451ipfw_delete(char *av[]) 2452{ 2453 uint32_t rulenum; 2454 int i; 2455 int exitval = EX_OK; 2456 int do_set = 0; 2457 2458 av++; 2459 NEED1("missing rule specification"); 2460 if ( *av && _substrcmp(*av, "set") == 0) { 2461 /* Do not allow using the following syntax: 2462 * ipfw set N delete set M 2463 */ 2464 if (co.use_set) 2465 errx(EX_DATAERR, "invalid syntax"); 2466 do_set = 1; /* delete set */ 2467 av++; 2468 } 2469 2470 /* Rule number */ 2471 while (*av && isdigit(**av)) { 2472 i = atoi(*av); av++; 2473 if (co.do_nat) { 2474 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2475 if (exitval) { 2476 exitval = EX_UNAVAILABLE; 2477 warn("rule %u not available", i); 2478 } 2479 } else if (co.do_pipe) { 2480 exitval = ipfw_delete_pipe(co.do_pipe, i); 2481 } else { 2482 if (co.use_set) 2483 rulenum = (i & 0xffff) | (5 << 24) | 2484 ((co.use_set - 1) << 16); 2485 else 2486 rulenum = (i & 0xffff) | (do_set << 24); 2487 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2488 if (i) { 2489 exitval = EX_UNAVAILABLE; 2490 warn("rule %u: setsockopt(IP_FW_DEL)", 2491 rulenum); 2492 } 2493 } 2494 } 2495 if (exitval != EX_OK) 2496 exit(exitval); 2497} 2498 2499 2500/* 2501 * fill the interface structure. We do not check the name as we can 2502 * create interfaces dynamically, so checking them at insert time 2503 * makes relatively little sense. 2504 * Interface names containing '*', '?', or '[' are assumed to be shell 2505 * patterns which match interfaces. 2506 */ 2507static void 2508fill_iface(ipfw_insn_if *cmd, char *arg, int cblen) 2509{ 2510 cmd->name[0] = '\0'; 2511 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2512 2513 CHECK_CMDLEN; 2514 2515 /* Parse the interface or address */ 2516 if (strcmp(arg, "any") == 0) 2517 cmd->o.len = 0; /* effectively ignore this command */ 2518 else if (strncmp(arg, "table(", 6) == 0) { 2519 char *p = strchr(arg + 6, ','); 2520 if (p) 2521 *p++ = '\0'; 2522 cmd->name[0] = '\1'; /* Special value indicating table */ 2523 cmd->p.glob = strtoul(arg + 6, NULL, 0); 2524 } else if (!isdigit(*arg)) { 2525 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2526 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2527 } else if (!inet_aton(arg, &cmd->p.ip)) 2528 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2529} 2530 2531static void 2532get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2533{ 2534 int i; 2535 size_t l; 2536 char *ap, *ptr, *optr; 2537 struct ether_addr *mac; 2538 const char *macset = "0123456789abcdefABCDEF:"; 2539 2540 if (strcmp(p, "any") == 0) { 2541 for (i = 0; i < ETHER_ADDR_LEN; i++) 2542 addr[i] = mask[i] = 0; 2543 return; 2544 } 2545 2546 optr = ptr = strdup(p); 2547 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2548 l = strlen(ap); 2549 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2550 errx(EX_DATAERR, "Incorrect MAC address"); 2551 bcopy(mac, addr, ETHER_ADDR_LEN); 2552 } else 2553 errx(EX_DATAERR, "Incorrect MAC address"); 2554 2555 if (ptr != NULL) { /* we have mask? */ 2556 if (p[ptr - optr - 1] == '/') { /* mask len */ 2557 long ml = strtol(ptr, &ap, 10); 2558 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 2559 errx(EX_DATAERR, "Incorrect mask length"); 2560 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 2561 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 2562 } else { /* mask */ 2563 l = strlen(ptr); 2564 if (strspn(ptr, macset) != l || 2565 (mac = ether_aton(ptr)) == NULL) 2566 errx(EX_DATAERR, "Incorrect mask"); 2567 bcopy(mac, mask, ETHER_ADDR_LEN); 2568 } 2569 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2570 for (i = 0; i < ETHER_ADDR_LEN; i++) 2571 mask[i] = 0xff; 2572 } 2573 for (i = 0; i < ETHER_ADDR_LEN; i++) 2574 addr[i] &= mask[i]; 2575 2576 free(optr); 2577} 2578 2579/* 2580 * helper function, updates the pointer to cmd with the length 2581 * of the current command, and also cleans up the first word of 2582 * the new command in case it has been clobbered before. 2583 */ 2584static ipfw_insn * 2585next_cmd(ipfw_insn *cmd, int *len) 2586{ 2587 *len -= F_LEN(cmd); 2588 CHECK_LENGTH(*len, 0); 2589 cmd += F_LEN(cmd); 2590 bzero(cmd, sizeof(*cmd)); 2591 return cmd; 2592} 2593 2594/* 2595 * Takes arguments and copies them into a comment 2596 */ 2597static void 2598fill_comment(ipfw_insn *cmd, char **av, int cblen) 2599{ 2600 int i, l; 2601 char *p = (char *)(cmd + 1); 2602 2603 cmd->opcode = O_NOP; 2604 cmd->len = (cmd->len & (F_NOT | F_OR)); 2605 2606 /* Compute length of comment string. */ 2607 for (i = 0, l = 0; av[i] != NULL; i++) 2608 l += strlen(av[i]) + 1; 2609 if (l == 0) 2610 return; 2611 if (l > 84) 2612 errx(EX_DATAERR, 2613 "comment too long (max 80 chars)"); 2614 l = 1 + (l+3)/4; 2615 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2616 CHECK_CMDLEN; 2617 2618 for (i = 0; av[i] != NULL; i++) { 2619 strcpy(p, av[i]); 2620 p += strlen(av[i]); 2621 *p++ = ' '; 2622 } 2623 *(--p) = '\0'; 2624} 2625 2626/* 2627 * A function to fill simple commands of size 1. 2628 * Existing flags are preserved. 2629 */ 2630static void 2631fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2632{ 2633 cmd->opcode = opcode; 2634 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2635 cmd->arg1 = arg; 2636} 2637 2638/* 2639 * Fetch and add the MAC address and type, with masks. This generates one or 2640 * two microinstructions, and returns the pointer to the last one. 2641 */ 2642static ipfw_insn * 2643add_mac(ipfw_insn *cmd, char *av[], int cblen) 2644{ 2645 ipfw_insn_mac *mac; 2646 2647 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 2648 errx(EX_DATAERR, "MAC dst src"); 2649 2650 cmd->opcode = O_MACADDR2; 2651 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2652 CHECK_CMDLEN; 2653 2654 mac = (ipfw_insn_mac *)cmd; 2655 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2656 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2657 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2658 return cmd; 2659} 2660 2661static ipfw_insn * 2662add_mactype(ipfw_insn *cmd, char *av, int cblen) 2663{ 2664 if (!av) 2665 errx(EX_DATAERR, "missing MAC type"); 2666 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2667 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 2668 cblen); 2669 cmd->opcode = O_MAC_TYPE; 2670 return cmd; 2671 } else 2672 return NULL; 2673} 2674 2675static ipfw_insn * 2676add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2677{ 2678 struct protoent *pe; 2679 char *ep; 2680 int proto; 2681 2682 proto = strtol(av, &ep, 10); 2683 if (*ep != '\0' || proto <= 0) { 2684 if ((pe = getprotobyname(av)) == NULL) 2685 return NULL; 2686 proto = pe->p_proto; 2687 } 2688 2689 fill_cmd(cmd, O_PROTO, 0, proto); 2690 *protop = proto; 2691 return cmd; 2692} 2693 2694static ipfw_insn * 2695add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2696{ 2697 u_char proto = IPPROTO_IP; 2698 2699 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2700 ; /* do not set O_IP4 nor O_IP6 */ 2701 else if (strcmp(av, "ip4") == 0) 2702 /* explicit "just IPv4" rule */ 2703 fill_cmd(cmd, O_IP4, 0, 0); 2704 else if (strcmp(av, "ip6") == 0) { 2705 /* explicit "just IPv6" rule */ 2706 proto = IPPROTO_IPV6; 2707 fill_cmd(cmd, O_IP6, 0, 0); 2708 } else 2709 return add_proto0(cmd, av, protop); 2710 2711 *protop = proto; 2712 return cmd; 2713} 2714 2715static ipfw_insn * 2716add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2717{ 2718 u_char proto = IPPROTO_IP; 2719 2720 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2721 ; /* do not set O_IP4 nor O_IP6 */ 2722 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2723 /* explicit "just IPv4" rule */ 2724 fill_cmd(cmd, O_IP4, 0, 0); 2725 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2726 /* explicit "just IPv6" rule */ 2727 proto = IPPROTO_IPV6; 2728 fill_cmd(cmd, O_IP6, 0, 0); 2729 } else 2730 return add_proto0(cmd, av, protop); 2731 2732 *protop = proto; 2733 return cmd; 2734} 2735 2736static ipfw_insn * 2737add_srcip(ipfw_insn *cmd, char *av, int cblen) 2738{ 2739 fill_ip((ipfw_insn_ip *)cmd, av, cblen); 2740 if (cmd->opcode == O_IP_DST_SET) /* set */ 2741 cmd->opcode = O_IP_SRC_SET; 2742 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2743 cmd->opcode = O_IP_SRC_LOOKUP; 2744 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2745 cmd->opcode = O_IP_SRC_ME; 2746 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2747 cmd->opcode = O_IP_SRC; 2748 else /* addr/mask */ 2749 cmd->opcode = O_IP_SRC_MASK; 2750 return cmd; 2751} 2752 2753static ipfw_insn * 2754add_dstip(ipfw_insn *cmd, char *av, int cblen) 2755{ 2756 fill_ip((ipfw_insn_ip *)cmd, av, cblen); 2757 if (cmd->opcode == O_IP_DST_SET) /* set */ 2758 ; 2759 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2760 ; 2761 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2762 cmd->opcode = O_IP_DST_ME; 2763 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2764 cmd->opcode = O_IP_DST; 2765 else /* addr/mask */ 2766 cmd->opcode = O_IP_DST_MASK; 2767 return cmd; 2768} 2769 2770static ipfw_insn * 2771add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 2772{ 2773 /* XXX "any" is trapped before. Perhaps "to" */ 2774 if (_substrcmp(av, "any") == 0) { 2775 return NULL; 2776 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 2777 /* XXX todo: check that we have a protocol with ports */ 2778 cmd->opcode = opcode; 2779 return cmd; 2780 } 2781 return NULL; 2782} 2783 2784static ipfw_insn * 2785add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen) 2786{ 2787 struct in6_addr a; 2788 char *host, *ch; 2789 ipfw_insn *ret = NULL; 2790 2791 if ((host = strdup(av)) == NULL) 2792 return NULL; 2793 if ((ch = strrchr(host, '/')) != NULL) 2794 *ch = '\0'; 2795 2796 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2797 inet_pton(AF_INET6, host, &a) == 1) 2798 ret = add_srcip6(cmd, av, cblen); 2799 /* XXX: should check for IPv4, not !IPv6 */ 2800 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2801 inet_pton(AF_INET6, host, &a) != 1)) 2802 ret = add_srcip(cmd, av, cblen); 2803 if (ret == NULL && strcmp(av, "any") != 0) 2804 ret = cmd; 2805 2806 free(host); 2807 return ret; 2808} 2809 2810static ipfw_insn * 2811add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen) 2812{ 2813 struct in6_addr a; 2814 char *host, *ch; 2815 ipfw_insn *ret = NULL; 2816 2817 if ((host = strdup(av)) == NULL) 2818 return NULL; 2819 if ((ch = strrchr(host, '/')) != NULL) 2820 *ch = '\0'; 2821 2822 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2823 inet_pton(AF_INET6, host, &a) == 1) 2824 ret = add_dstip6(cmd, av, cblen); 2825 /* XXX: should check for IPv4, not !IPv6 */ 2826 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2827 inet_pton(AF_INET6, host, &a) != 1)) 2828 ret = add_dstip(cmd, av, cblen); 2829 if (ret == NULL && strcmp(av, "any") != 0) 2830 ret = cmd; 2831 2832 free(host); 2833 return ret; 2834} 2835 2836/* 2837 * Parse arguments and assemble the microinstructions which make up a rule. 2838 * Rules are added into the 'rulebuf' and then copied in the correct order 2839 * into the actual rule. 2840 * 2841 * The syntax for a rule starts with the action, followed by 2842 * optional action parameters, and the various match patterns. 2843 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2844 * (generated if the rule includes a keep-state option), then the 2845 * various match patterns, log/altq actions, and the actual action. 2846 * 2847 */ 2848void 2849ipfw_add(char *av[]) 2850{ 2851 /* 2852 * rules are added into the 'rulebuf' and then copied in 2853 * the correct order into the actual rule. 2854 * Some things that need to go out of order (prob, action etc.) 2855 * go into actbuf[]. 2856 */ 2857 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2858 int rblen, ablen, cblen; 2859 2860 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2861 ipfw_insn *first_cmd; /* first match pattern */ 2862 2863 struct ip_fw *rule; 2864 2865 /* 2866 * various flags used to record that we entered some fields. 2867 */ 2868 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2869 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2870 size_t len; 2871 2872 int i; 2873 2874 int open_par = 0; /* open parenthesis ( */ 2875 2876 /* proto is here because it is used to fetch ports */ 2877 u_char proto = IPPROTO_IP; /* default protocol */ 2878 2879 double match_prob = 1; /* match probability, default is always match */ 2880 2881 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2882 bzero(cmdbuf, sizeof(cmdbuf)); 2883 bzero(rulebuf, sizeof(rulebuf)); 2884 2885 rule = (struct ip_fw *)rulebuf; 2886 cmd = (ipfw_insn *)cmdbuf; 2887 action = (ipfw_insn *)actbuf; 2888 2889 rblen = sizeof(rulebuf) / sizeof(rulebuf[0]); 2890 rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]); 2891 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 2892 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 2893 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 2894 2895#define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 2896#define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 2897 2898 av++; 2899 2900 /* [rule N] -- Rule number optional */ 2901 if (av[0] && isdigit(**av)) { 2902 rule->rulenum = atoi(*av); 2903 av++; 2904 } 2905 2906 /* [set N] -- set number (0..RESVD_SET), optional */ 2907 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 2908 int set = strtoul(av[1], NULL, 10); 2909 if (set < 0 || set > RESVD_SET) 2910 errx(EX_DATAERR, "illegal set %s", av[1]); 2911 rule->set = set; 2912 av += 2; 2913 } 2914 2915 /* [prob D] -- match probability, optional */ 2916 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 2917 match_prob = strtod(av[1], NULL); 2918 2919 if (match_prob <= 0 || match_prob > 1) 2920 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2921 av += 2; 2922 } 2923 2924 /* action -- mandatory */ 2925 NEED1("missing action"); 2926 i = match_token(rule_actions, *av); 2927 av++; 2928 action->len = 1; /* default */ 2929 CHECK_ACTLEN; 2930 switch(i) { 2931 case TOK_CHECKSTATE: 2932 have_state = action; 2933 action->opcode = O_CHECK_STATE; 2934 break; 2935 2936 case TOK_ACCEPT: 2937 action->opcode = O_ACCEPT; 2938 break; 2939 2940 case TOK_DENY: 2941 action->opcode = O_DENY; 2942 action->arg1 = 0; 2943 break; 2944 2945 case TOK_REJECT: 2946 action->opcode = O_REJECT; 2947 action->arg1 = ICMP_UNREACH_HOST; 2948 break; 2949 2950 case TOK_RESET: 2951 action->opcode = O_REJECT; 2952 action->arg1 = ICMP_REJECT_RST; 2953 break; 2954 2955 case TOK_RESET6: 2956 action->opcode = O_UNREACH6; 2957 action->arg1 = ICMP6_UNREACH_RST; 2958 break; 2959 2960 case TOK_UNREACH: 2961 action->opcode = O_REJECT; 2962 NEED1("missing reject code"); 2963 fill_reject_code(&action->arg1, *av); 2964 av++; 2965 break; 2966 2967 case TOK_UNREACH6: 2968 action->opcode = O_UNREACH6; 2969 NEED1("missing unreach code"); 2970 fill_unreach6_code(&action->arg1, *av); 2971 av++; 2972 break; 2973 2974 case TOK_COUNT: 2975 action->opcode = O_COUNT; 2976 break; 2977 2978 case TOK_NAT: 2979 action->opcode = O_NAT; 2980 action->len = F_INSN_SIZE(ipfw_insn_nat); 2981 CHECK_ACTLEN; 2982 if (_substrcmp(*av, "global") == 0) { 2983 action->arg1 = 0; 2984 av++; 2985 break; 2986 } else 2987 goto chkarg; 2988 2989 case TOK_QUEUE: 2990 action->opcode = O_QUEUE; 2991 goto chkarg; 2992 case TOK_PIPE: 2993 action->opcode = O_PIPE; 2994 goto chkarg; 2995 case TOK_SKIPTO: 2996 action->opcode = O_SKIPTO; 2997 goto chkarg; 2998 case TOK_NETGRAPH: 2999 action->opcode = O_NETGRAPH; 3000 goto chkarg; 3001 case TOK_NGTEE: 3002 action->opcode = O_NGTEE; 3003 goto chkarg; 3004 case TOK_DIVERT: 3005 action->opcode = O_DIVERT; 3006 goto chkarg; 3007 case TOK_TEE: 3008 action->opcode = O_TEE; 3009 goto chkarg; 3010 case TOK_CALL: 3011 action->opcode = O_CALLRETURN; 3012chkarg: 3013 if (!av[0]) 3014 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 3015 if (isdigit(**av)) { 3016 action->arg1 = strtoul(*av, NULL, 10); 3017 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 3018 errx(EX_DATAERR, "illegal argument for %s", 3019 *(av - 1)); 3020 } else if (_substrcmp(*av, "tablearg") == 0) { 3021 action->arg1 = IP_FW_TABLEARG; 3022 } else if (i == TOK_DIVERT || i == TOK_TEE) { 3023 struct servent *s; 3024 setservent(1); 3025 s = getservbyname(av[0], "divert"); 3026 if (s != NULL) 3027 action->arg1 = ntohs(s->s_port); 3028 else 3029 errx(EX_DATAERR, "illegal divert/tee port"); 3030 } else 3031 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 3032 av++; 3033 break; 3034 3035 case TOK_FORWARD: { 3036 /* 3037 * Locate the address-port separator (':' or ','). 3038 * Could be one of the following: 3039 * hostname:port 3040 * IPv4 a.b.c.d,port 3041 * IPv4 a.b.c.d:port 3042 * IPv6 w:x:y::z,port 3043 * The ':' can only be used with hostname and IPv4 address. 3044 * XXX-BZ Should we also support [w:x:y::z]:port? 3045 */ 3046 struct sockaddr_storage result; 3047 struct addrinfo *res; 3048 char *s, *end; 3049 int family; 3050 u_short port_number; 3051 3052 NEED1("missing forward address[:port]"); 3053 3054 /* 3055 * locate the address-port separator (':' or ',') 3056 */ 3057 s = strchr(*av, ','); 3058 if (s == NULL) { 3059 /* Distinguish between IPv4:port and IPv6 cases. */ 3060 s = strchr(*av, ':'); 3061 if (s && strchr(s+1, ':')) 3062 s = NULL; /* no port */ 3063 } 3064 3065 port_number = 0; 3066 if (s != NULL) { 3067 /* Terminate host portion and set s to start of port. */ 3068 *(s++) = '\0'; 3069 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 3070 if (s == end) 3071 errx(EX_DATAERR, 3072 "illegal forwarding port ``%s''", s); 3073 port_number = (u_short)i; 3074 } 3075 3076 if (_substrcmp(*av, "tablearg") == 0) { 3077 family = PF_INET; 3078 ((struct sockaddr_in*)&result)->sin_addr.s_addr = 3079 INADDR_ANY; 3080 } else { 3081 /* 3082 * Resolve the host name or address to a family and a 3083 * network representation of the addres. 3084 */ 3085 if (getaddrinfo(*av, NULL, NULL, &res)) 3086 errx(EX_DATAERR, NULL); 3087 /* Just use the first host in the answer. */ 3088 family = res->ai_family; 3089 memcpy(&result, res->ai_addr, res->ai_addrlen); 3090 freeaddrinfo(res); 3091 } 3092 3093 if (family == PF_INET) { 3094 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 3095 3096 action->opcode = O_FORWARD_IP; 3097 action->len = F_INSN_SIZE(ipfw_insn_sa); 3098 CHECK_ACTLEN; 3099 3100 /* 3101 * In the kernel we assume AF_INET and use only 3102 * sin_port and sin_addr. Remember to set sin_len as 3103 * the routing code seems to use it too. 3104 */ 3105 p->sa.sin_len = sizeof(struct sockaddr_in); 3106 p->sa.sin_family = AF_INET; 3107 p->sa.sin_port = port_number; 3108 p->sa.sin_addr.s_addr = 3109 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 3110 } else if (family == PF_INET6) { 3111 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 3112 3113 action->opcode = O_FORWARD_IP6; 3114 action->len = F_INSN_SIZE(ipfw_insn_sa6); 3115 CHECK_ACTLEN; 3116 3117 p->sa.sin6_len = sizeof(struct sockaddr_in6); 3118 p->sa.sin6_family = AF_INET6; 3119 p->sa.sin6_port = port_number; 3120 p->sa.sin6_flowinfo = 0; 3121 p->sa.sin6_scope_id = 0; 3122 /* No table support for v6 yet. */ 3123 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 3124 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 3125 } else { 3126 errx(EX_DATAERR, "Invalid address family in forward action"); 3127 } 3128 av++; 3129 break; 3130 } 3131 case TOK_COMMENT: 3132 /* pretend it is a 'count' rule followed by the comment */ 3133 action->opcode = O_COUNT; 3134 av--; /* go back... */ 3135 break; 3136 3137 case TOK_SETFIB: 3138 { 3139 int numfibs; 3140 size_t intsize = sizeof(int); 3141 3142 action->opcode = O_SETFIB; 3143 NEED1("missing fib number"); 3144 if (_substrcmp(*av, "tablearg") == 0) { 3145 action->arg1 = IP_FW_TABLEARG; 3146 } else { 3147 action->arg1 = strtoul(*av, NULL, 10); 3148 if (sysctlbyname("net.fibs", &numfibs, &intsize, 3149 NULL, 0) == -1) 3150 errx(EX_DATAERR, "fibs not suported.\n"); 3151 if (action->arg1 >= numfibs) /* Temporary */ 3152 errx(EX_DATAERR, "fib too large.\n"); 3153 } 3154 av++; 3155 break; 3156 } 3157 3158 case TOK_SETDSCP: 3159 { 3160 int code; 3161 3162 action->opcode = O_SETDSCP; 3163 NEED1("missing DSCP code"); 3164 if (_substrcmp(*av, "tablearg") == 0) { 3165 action->arg1 = IP_FW_TABLEARG; 3166 } else if (isalpha(*av[0])) { 3167 if ((code = match_token(f_ipdscp, *av)) == -1) 3168 errx(EX_DATAERR, "Unknown DSCP code"); 3169 action->arg1 = code; 3170 } else 3171 action->arg1 = strtoul(*av, NULL, 10); 3172 av++; 3173 break; 3174 } 3175 3176 case TOK_REASS: 3177 action->opcode = O_REASS; 3178 break; 3179 3180 case TOK_RETURN: 3181 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 3182 break; 3183 3184 default: 3185 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 3186 } 3187 action = next_cmd(action, &ablen); 3188 3189 /* 3190 * [altq queuename] -- altq tag, optional 3191 * [log [logamount N]] -- log, optional 3192 * 3193 * If they exist, it go first in the cmdbuf, but then it is 3194 * skipped in the copy section to the end of the buffer. 3195 */ 3196 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 3197 av++; 3198 switch (i) { 3199 case TOK_LOG: 3200 { 3201 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 3202 int l; 3203 3204 if (have_log) 3205 errx(EX_DATAERR, 3206 "log cannot be specified more than once"); 3207 have_log = (ipfw_insn *)c; 3208 cmd->len = F_INSN_SIZE(ipfw_insn_log); 3209 CHECK_CMDLEN; 3210 cmd->opcode = O_LOG; 3211 if (av[0] && _substrcmp(*av, "logamount") == 0) { 3212 av++; 3213 NEED1("logamount requires argument"); 3214 l = atoi(*av); 3215 if (l < 0) 3216 errx(EX_DATAERR, 3217 "logamount must be positive"); 3218 c->max_log = l; 3219 av++; 3220 } else { 3221 len = sizeof(c->max_log); 3222 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 3223 &c->max_log, &len, NULL, 0) == -1) { 3224 if (co.test_only) { 3225 c->max_log = 0; 3226 break; 3227 } 3228 errx(1, "sysctlbyname(\"%s\")", 3229 "net.inet.ip.fw.verbose_limit"); 3230 } 3231 } 3232 } 3233 break; 3234 3235#ifndef NO_ALTQ 3236 case TOK_ALTQ: 3237 { 3238 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 3239 3240 NEED1("missing altq queue name"); 3241 if (have_altq) 3242 errx(EX_DATAERR, 3243 "altq cannot be specified more than once"); 3244 have_altq = (ipfw_insn *)a; 3245 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 3246 CHECK_CMDLEN; 3247 cmd->opcode = O_ALTQ; 3248 a->qid = altq_name_to_qid(*av); 3249 av++; 3250 } 3251 break; 3252#endif 3253 3254 case TOK_TAG: 3255 case TOK_UNTAG: { 3256 uint16_t tag; 3257 3258 if (have_tag) 3259 errx(EX_USAGE, "tag and untag cannot be " 3260 "specified more than once"); 3261 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 3262 rule_action_params); 3263 have_tag = cmd; 3264 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 3265 av++; 3266 break; 3267 } 3268 3269 default: 3270 abort(); 3271 } 3272 cmd = next_cmd(cmd, &cblen); 3273 } 3274 3275 if (have_state) /* must be a check-state, we are done */ 3276 goto done; 3277 3278#define OR_START(target) \ 3279 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 3280 if (open_par) \ 3281 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 3282 prev = NULL; \ 3283 open_par = 1; \ 3284 if ( (av[0])[1] == '\0') { \ 3285 av++; \ 3286 } else \ 3287 (*av)++; \ 3288 } \ 3289 target: \ 3290 3291 3292#define CLOSE_PAR \ 3293 if (open_par) { \ 3294 if (av[0] && ( \ 3295 strcmp(*av, ")") == 0 || \ 3296 strcmp(*av, "}") == 0)) { \ 3297 prev = NULL; \ 3298 open_par = 0; \ 3299 av++; \ 3300 } else \ 3301 errx(EX_USAGE, "missing \")\"\n"); \ 3302 } 3303 3304#define NOT_BLOCK \ 3305 if (av[0] && _substrcmp(*av, "not") == 0) { \ 3306 if (cmd->len & F_NOT) \ 3307 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 3308 cmd->len |= F_NOT; \ 3309 av++; \ 3310 } 3311 3312#define OR_BLOCK(target) \ 3313 if (av[0] && _substrcmp(*av, "or") == 0) { \ 3314 if (prev == NULL || open_par == 0) \ 3315 errx(EX_DATAERR, "invalid OR block"); \ 3316 prev->len |= F_OR; \ 3317 av++; \ 3318 goto target; \ 3319 } \ 3320 CLOSE_PAR; 3321 3322 first_cmd = cmd; 3323 3324#if 0 3325 /* 3326 * MAC addresses, optional. 3327 * If we have this, we skip the part "proto from src to dst" 3328 * and jump straight to the option parsing. 3329 */ 3330 NOT_BLOCK; 3331 NEED1("missing protocol"); 3332 if (_substrcmp(*av, "MAC") == 0 || 3333 _substrcmp(*av, "mac") == 0) { 3334 av++; /* the "MAC" keyword */ 3335 add_mac(cmd, av); /* exits in case of errors */ 3336 cmd = next_cmd(cmd); 3337 av += 2; /* dst-mac and src-mac */ 3338 NOT_BLOCK; 3339 NEED1("missing mac type"); 3340 if (add_mactype(cmd, av[0])) 3341 cmd = next_cmd(cmd); 3342 av++; /* any or mac-type */ 3343 goto read_options; 3344 } 3345#endif 3346 3347 /* 3348 * protocol, mandatory 3349 */ 3350 OR_START(get_proto); 3351 NOT_BLOCK; 3352 NEED1("missing protocol"); 3353 if (add_proto_compat(cmd, *av, &proto)) { 3354 av++; 3355 if (F_LEN(cmd) != 0) { 3356 prev = cmd; 3357 cmd = next_cmd(cmd, &cblen); 3358 } 3359 } else if (first_cmd != cmd) { 3360 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3361 } else 3362 goto read_options; 3363 OR_BLOCK(get_proto); 3364 3365 /* 3366 * "from", mandatory 3367 */ 3368 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3369 errx(EX_USAGE, "missing ``from''"); 3370 av++; 3371 3372 /* 3373 * source IP, mandatory 3374 */ 3375 OR_START(source_ip); 3376 NOT_BLOCK; /* optional "not" */ 3377 NEED1("missing source address"); 3378 if (add_src(cmd, *av, proto, cblen)) { 3379 av++; 3380 if (F_LEN(cmd) != 0) { /* ! any */ 3381 prev = cmd; 3382 cmd = next_cmd(cmd, &cblen); 3383 } 3384 } else 3385 errx(EX_USAGE, "bad source address %s", *av); 3386 OR_BLOCK(source_ip); 3387 3388 /* 3389 * source ports, optional 3390 */ 3391 NOT_BLOCK; /* optional "not" */ 3392 if ( av[0] != NULL ) { 3393 if (_substrcmp(*av, "any") == 0 || 3394 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 3395 av++; 3396 if (F_LEN(cmd) != 0) 3397 cmd = next_cmd(cmd, &cblen); 3398 } 3399 } 3400 3401 /* 3402 * "to", mandatory 3403 */ 3404 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 3405 errx(EX_USAGE, "missing ``to''"); 3406 av++; 3407 3408 /* 3409 * destination, mandatory 3410 */ 3411 OR_START(dest_ip); 3412 NOT_BLOCK; /* optional "not" */ 3413 NEED1("missing dst address"); 3414 if (add_dst(cmd, *av, proto, cblen)) { 3415 av++; 3416 if (F_LEN(cmd) != 0) { /* ! any */ 3417 prev = cmd; 3418 cmd = next_cmd(cmd, &cblen); 3419 } 3420 } else 3421 errx( EX_USAGE, "bad destination address %s", *av); 3422 OR_BLOCK(dest_ip); 3423 3424 /* 3425 * dest. ports, optional 3426 */ 3427 NOT_BLOCK; /* optional "not" */ 3428 if (av[0]) { 3429 if (_substrcmp(*av, "any") == 0 || 3430 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 3431 av++; 3432 if (F_LEN(cmd) != 0) 3433 cmd = next_cmd(cmd, &cblen); 3434 } 3435 } 3436 3437read_options: 3438 if (av[0] && first_cmd == cmd) { 3439 /* 3440 * nothing specified so far, store in the rule to ease 3441 * printout later. 3442 */ 3443 rule->_pad = 1; 3444 } 3445 prev = NULL; 3446 while ( av[0] != NULL ) { 3447 char *s; 3448 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3449 3450 s = *av; 3451 cmd32 = (ipfw_insn_u32 *)cmd; 3452 3453 if (*s == '!') { /* alternate syntax for NOT */ 3454 if (cmd->len & F_NOT) 3455 errx(EX_USAGE, "double \"not\" not allowed\n"); 3456 cmd->len = F_NOT; 3457 s++; 3458 } 3459 i = match_token(rule_options, s); 3460 av++; 3461 switch(i) { 3462 case TOK_NOT: 3463 if (cmd->len & F_NOT) 3464 errx(EX_USAGE, "double \"not\" not allowed\n"); 3465 cmd->len = F_NOT; 3466 break; 3467 3468 case TOK_OR: 3469 if (open_par == 0 || prev == NULL) 3470 errx(EX_USAGE, "invalid \"or\" block\n"); 3471 prev->len |= F_OR; 3472 break; 3473 3474 case TOK_STARTBRACE: 3475 if (open_par) 3476 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3477 open_par = 1; 3478 break; 3479 3480 case TOK_ENDBRACE: 3481 if (!open_par) 3482 errx(EX_USAGE, "+missing \")\"\n"); 3483 open_par = 0; 3484 prev = NULL; 3485 break; 3486 3487 case TOK_IN: 3488 fill_cmd(cmd, O_IN, 0, 0); 3489 break; 3490 3491 case TOK_OUT: 3492 cmd->len ^= F_NOT; /* toggle F_NOT */ 3493 fill_cmd(cmd, O_IN, 0, 0); 3494 break; 3495 3496 case TOK_DIVERTED: 3497 fill_cmd(cmd, O_DIVERTED, 0, 3); 3498 break; 3499 3500 case TOK_DIVERTEDLOOPBACK: 3501 fill_cmd(cmd, O_DIVERTED, 0, 1); 3502 break; 3503 3504 case TOK_DIVERTEDOUTPUT: 3505 fill_cmd(cmd, O_DIVERTED, 0, 2); 3506 break; 3507 3508 case TOK_FRAG: 3509 fill_cmd(cmd, O_FRAG, 0, 0); 3510 break; 3511 3512 case TOK_LAYER2: 3513 fill_cmd(cmd, O_LAYER2, 0, 0); 3514 break; 3515 3516 case TOK_XMIT: 3517 case TOK_RECV: 3518 case TOK_VIA: 3519 NEED1("recv, xmit, via require interface name" 3520 " or address"); 3521 fill_iface((ipfw_insn_if *)cmd, av[0], cblen); 3522 av++; 3523 if (F_LEN(cmd) == 0) /* not a valid address */ 3524 break; 3525 if (i == TOK_XMIT) 3526 cmd->opcode = O_XMIT; 3527 else if (i == TOK_RECV) 3528 cmd->opcode = O_RECV; 3529 else if (i == TOK_VIA) 3530 cmd->opcode = O_VIA; 3531 break; 3532 3533 case TOK_ICMPTYPES: 3534 NEED1("icmptypes requires list of types"); 3535 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3536 av++; 3537 break; 3538 3539 case TOK_ICMP6TYPES: 3540 NEED1("icmptypes requires list of types"); 3541 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 3542 av++; 3543 break; 3544 3545 case TOK_IPTTL: 3546 NEED1("ipttl requires TTL"); 3547 if (strpbrk(*av, "-,")) { 3548 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 3549 errx(EX_DATAERR, "invalid ipttl %s", *av); 3550 } else 3551 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3552 av++; 3553 break; 3554 3555 case TOK_IPID: 3556 NEED1("ipid requires id"); 3557 if (strpbrk(*av, "-,")) { 3558 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 3559 errx(EX_DATAERR, "invalid ipid %s", *av); 3560 } else 3561 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3562 av++; 3563 break; 3564 3565 case TOK_IPLEN: 3566 NEED1("iplen requires length"); 3567 if (strpbrk(*av, "-,")) { 3568 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 3569 errx(EX_DATAERR, "invalid ip len %s", *av); 3570 } else 3571 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3572 av++; 3573 break; 3574 3575 case TOK_IPVER: 3576 NEED1("ipver requires version"); 3577 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3578 av++; 3579 break; 3580 3581 case TOK_IPPRECEDENCE: 3582 NEED1("ipprecedence requires value"); 3583 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3584 (strtoul(*av, NULL, 0) & 7) << 5); 3585 av++; 3586 break; 3587 3588 case TOK_DSCP: 3589 NEED1("missing DSCP code"); 3590 fill_dscp(cmd, *av, cblen); 3591 av++; 3592 break; 3593 3594 case TOK_IPOPTS: 3595 NEED1("missing argument for ipoptions"); 3596 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3597 av++; 3598 break; 3599 3600 case TOK_IPTOS: 3601 NEED1("missing argument for iptos"); 3602 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3603 av++; 3604 break; 3605 3606 case TOK_UID: 3607 NEED1("uid requires argument"); 3608 { 3609 char *end; 3610 uid_t uid; 3611 struct passwd *pwd; 3612 3613 cmd->opcode = O_UID; 3614 uid = strtoul(*av, &end, 0); 3615 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3616 if (pwd == NULL) 3617 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3618 cmd32->d[0] = pwd->pw_uid; 3619 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3620 av++; 3621 } 3622 break; 3623 3624 case TOK_GID: 3625 NEED1("gid requires argument"); 3626 { 3627 char *end; 3628 gid_t gid; 3629 struct group *grp; 3630 3631 cmd->opcode = O_GID; 3632 gid = strtoul(*av, &end, 0); 3633 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3634 if (grp == NULL) 3635 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3636 cmd32->d[0] = grp->gr_gid; 3637 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3638 av++; 3639 } 3640 break; 3641 3642 case TOK_JAIL: 3643 NEED1("jail requires argument"); 3644 { 3645 char *end; 3646 int jid; 3647 3648 cmd->opcode = O_JAIL; 3649 jid = (int)strtol(*av, &end, 0); 3650 if (jid < 0 || *end != '\0') 3651 errx(EX_DATAERR, "jail requires prison ID"); 3652 cmd32->d[0] = (uint32_t)jid; 3653 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3654 av++; 3655 } 3656 break; 3657 3658 case TOK_ESTAB: 3659 fill_cmd(cmd, O_ESTAB, 0, 0); 3660 break; 3661 3662 case TOK_SETUP: 3663 fill_cmd(cmd, O_TCPFLAGS, 0, 3664 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3665 break; 3666 3667 case TOK_TCPDATALEN: 3668 NEED1("tcpdatalen requires length"); 3669 if (strpbrk(*av, "-,")) { 3670 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 3671 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3672 } else 3673 fill_cmd(cmd, O_TCPDATALEN, 0, 3674 strtoul(*av, NULL, 0)); 3675 av++; 3676 break; 3677 3678 case TOK_TCPOPTS: 3679 NEED1("missing argument for tcpoptions"); 3680 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3681 av++; 3682 break; 3683 3684 case TOK_TCPSEQ: 3685 case TOK_TCPACK: 3686 NEED1("tcpseq/tcpack requires argument"); 3687 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3688 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3689 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3690 av++; 3691 break; 3692 3693 case TOK_TCPWIN: 3694 NEED1("tcpwin requires length"); 3695 if (strpbrk(*av, "-,")) { 3696 if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen)) 3697 errx(EX_DATAERR, "invalid tcpwin len %s", *av); 3698 } else 3699 fill_cmd(cmd, O_TCPWIN, 0, 3700 strtoul(*av, NULL, 0)); 3701 av++; 3702 break; 3703 3704 case TOK_TCPFLAGS: 3705 NEED1("missing argument for tcpflags"); 3706 cmd->opcode = O_TCPFLAGS; 3707 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3708 av++; 3709 break; 3710 3711 case TOK_KEEPSTATE: 3712 if (open_par) 3713 errx(EX_USAGE, "keep-state cannot be part " 3714 "of an or block"); 3715 if (have_state) 3716 errx(EX_USAGE, "only one of keep-state " 3717 "and limit is allowed"); 3718 have_state = cmd; 3719 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3720 break; 3721 3722 case TOK_LIMIT: { 3723 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3724 int val; 3725 3726 if (open_par) 3727 errx(EX_USAGE, 3728 "limit cannot be part of an or block"); 3729 if (have_state) 3730 errx(EX_USAGE, "only one of keep-state and " 3731 "limit is allowed"); 3732 have_state = cmd; 3733 3734 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3735 CHECK_CMDLEN; 3736 cmd->opcode = O_LIMIT; 3737 c->limit_mask = c->conn_limit = 0; 3738 3739 while ( av[0] != NULL ) { 3740 if ((val = match_token(limit_masks, *av)) <= 0) 3741 break; 3742 c->limit_mask |= val; 3743 av++; 3744 } 3745 3746 if (c->limit_mask == 0) 3747 errx(EX_USAGE, "limit: missing limit mask"); 3748 3749 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3750 TOK_LIMIT, rule_options); 3751 3752 av++; 3753 break; 3754 } 3755 3756 case TOK_PROTO: 3757 NEED1("missing protocol"); 3758 if (add_proto(cmd, *av, &proto)) { 3759 av++; 3760 } else 3761 errx(EX_DATAERR, "invalid protocol ``%s''", 3762 *av); 3763 break; 3764 3765 case TOK_SRCIP: 3766 NEED1("missing source IP"); 3767 if (add_srcip(cmd, *av, cblen)) { 3768 av++; 3769 } 3770 break; 3771 3772 case TOK_DSTIP: 3773 NEED1("missing destination IP"); 3774 if (add_dstip(cmd, *av, cblen)) { 3775 av++; 3776 } 3777 break; 3778 3779 case TOK_SRCIP6: 3780 NEED1("missing source IP6"); 3781 if (add_srcip6(cmd, *av, cblen)) { 3782 av++; 3783 } 3784 break; 3785 3786 case TOK_DSTIP6: 3787 NEED1("missing destination IP6"); 3788 if (add_dstip6(cmd, *av, cblen)) { 3789 av++; 3790 } 3791 break; 3792 3793 case TOK_SRCPORT: 3794 NEED1("missing source port"); 3795 if (_substrcmp(*av, "any") == 0 || 3796 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 3797 av++; 3798 } else 3799 errx(EX_DATAERR, "invalid source port %s", *av); 3800 break; 3801 3802 case TOK_DSTPORT: 3803 NEED1("missing destination port"); 3804 if (_substrcmp(*av, "any") == 0 || 3805 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 3806 av++; 3807 } else 3808 errx(EX_DATAERR, "invalid destination port %s", 3809 *av); 3810 break; 3811 3812 case TOK_MAC: 3813 if (add_mac(cmd, av, cblen)) 3814 av += 2; 3815 break; 3816 3817 case TOK_MACTYPE: 3818 NEED1("missing mac type"); 3819 if (!add_mactype(cmd, *av, cblen)) 3820 errx(EX_DATAERR, "invalid mac type %s", *av); 3821 av++; 3822 break; 3823 3824 case TOK_VERREVPATH: 3825 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3826 break; 3827 3828 case TOK_VERSRCREACH: 3829 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3830 break; 3831 3832 case TOK_ANTISPOOF: 3833 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3834 break; 3835 3836 case TOK_IPSEC: 3837 fill_cmd(cmd, O_IPSEC, 0, 0); 3838 break; 3839 3840 case TOK_IPV6: 3841 fill_cmd(cmd, O_IP6, 0, 0); 3842 break; 3843 3844 case TOK_IPV4: 3845 fill_cmd(cmd, O_IP4, 0, 0); 3846 break; 3847 3848 case TOK_EXT6HDR: 3849 fill_ext6hdr( cmd, *av ); 3850 av++; 3851 break; 3852 3853 case TOK_FLOWID: 3854 if (proto != IPPROTO_IPV6 ) 3855 errx( EX_USAGE, "flow-id filter is active " 3856 "only for ipv6 protocol\n"); 3857 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 3858 av++; 3859 break; 3860 3861 case TOK_COMMENT: 3862 fill_comment(cmd, av, cblen); 3863 av[0]=NULL; 3864 break; 3865 3866 case TOK_TAGGED: 3867 if (av[0] && strpbrk(*av, "-,")) { 3868 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 3869 errx(EX_DATAERR, "tagged: invalid tag" 3870 " list: %s", *av); 3871 } 3872 else { 3873 uint16_t tag; 3874 3875 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3876 TOK_TAGGED, rule_options); 3877 fill_cmd(cmd, O_TAGGED, 0, tag); 3878 } 3879 av++; 3880 break; 3881 3882 case TOK_FIB: 3883 NEED1("fib requires fib number"); 3884 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3885 av++; 3886 break; 3887 case TOK_SOCKARG: 3888 fill_cmd(cmd, O_SOCKARG, 0, 0); 3889 break; 3890 3891 case TOK_LOOKUP: { 3892 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 3893 char *p; 3894 int j; 3895 3896 if (!av[0] || !av[1]) 3897 errx(EX_USAGE, "format: lookup argument tablenum"); 3898 cmd->opcode = O_IP_DST_LOOKUP; 3899 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 3900 i = match_token(rule_options, *av); 3901 for (j = 0; lookup_key[j] >= 0 ; j++) { 3902 if (i == lookup_key[j]) 3903 break; 3904 } 3905 if (lookup_key[j] <= 0) 3906 errx(EX_USAGE, "format: cannot lookup on %s", *av); 3907 __PAST_END(c->d, 1) = j; // i converted to option 3908 av++; 3909 cmd->arg1 = strtoul(*av, &p, 0); 3910 if (p && *p) 3911 errx(EX_USAGE, "format: lookup argument tablenum"); 3912 av++; 3913 } 3914 break; 3915 3916 default: 3917 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3918 } 3919 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3920 prev = cmd; 3921 cmd = next_cmd(cmd, &cblen); 3922 } 3923 } 3924 3925done: 3926 /* 3927 * Now copy stuff into the rule. 3928 * If we have a keep-state option, the first instruction 3929 * must be a PROBE_STATE (which is generated here). 3930 * If we have a LOG option, it was stored as the first command, 3931 * and now must be moved to the top of the action part. 3932 */ 3933 dst = (ipfw_insn *)rule->cmd; 3934 3935 /* 3936 * First thing to write into the command stream is the match probability. 3937 */ 3938 if (match_prob != 1) { /* 1 means always match */ 3939 dst->opcode = O_PROB; 3940 dst->len = 2; 3941 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3942 dst += dst->len; 3943 } 3944 3945 /* 3946 * generate O_PROBE_STATE if necessary 3947 */ 3948 if (have_state && have_state->opcode != O_CHECK_STATE) { 3949 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3950 dst = next_cmd(dst, &rblen); 3951 } 3952 3953 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3954 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3955 i = F_LEN(src); 3956 CHECK_RBUFLEN(i); 3957 3958 switch (src->opcode) { 3959 case O_LOG: 3960 case O_KEEP_STATE: 3961 case O_LIMIT: 3962 case O_ALTQ: 3963 case O_TAG: 3964 break; 3965 default: 3966 bcopy(src, dst, i * sizeof(uint32_t)); 3967 dst += i; 3968 } 3969 } 3970 3971 /* 3972 * put back the have_state command as last opcode 3973 */ 3974 if (have_state && have_state->opcode != O_CHECK_STATE) { 3975 i = F_LEN(have_state); 3976 CHECK_RBUFLEN(i); 3977 bcopy(have_state, dst, i * sizeof(uint32_t)); 3978 dst += i; 3979 } 3980 /* 3981 * start action section 3982 */ 3983 rule->act_ofs = dst - rule->cmd; 3984 3985 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3986 if (have_log) { 3987 i = F_LEN(have_log); 3988 CHECK_RBUFLEN(i); 3989 bcopy(have_log, dst, i * sizeof(uint32_t)); 3990 dst += i; 3991 } 3992 if (have_altq) { 3993 i = F_LEN(have_altq); 3994 CHECK_RBUFLEN(i); 3995 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3996 dst += i; 3997 } 3998 if (have_tag) { 3999 i = F_LEN(have_tag); 4000 CHECK_RBUFLEN(i); 4001 bcopy(have_tag, dst, i * sizeof(uint32_t)); 4002 dst += i; 4003 } 4004 4005 /* 4006 * copy all other actions 4007 */ 4008 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 4009 i = F_LEN(src); 4010 CHECK_RBUFLEN(i); 4011 bcopy(src, dst, i * sizeof(uint32_t)); 4012 dst += i; 4013 } 4014 4015 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 4016 i = (char *)dst - (char *)rule; 4017 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 4018 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 4019 if (!co.do_quiet) 4020 show_ipfw(rule, 0, 0); 4021} 4022 4023/* 4024 * clear the counters or the log counters. 4025 */ 4026void 4027ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 4028{ 4029 uint32_t arg, saved_arg; 4030 int failed = EX_OK; 4031 char const *errstr; 4032 char const *name = optname ? "RESETLOG" : "ZERO"; 4033 4034 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 4035 4036 av++; ac--; 4037 4038 if (!ac) { 4039 /* clear all entries */ 4040 if (do_cmd(optname, NULL, 0) < 0) 4041 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 4042 if (!co.do_quiet) 4043 printf("%s.\n", optname == IP_FW_ZERO ? 4044 "Accounting cleared":"Logging counts reset"); 4045 4046 return; 4047 } 4048 4049 while (ac) { 4050 /* Rule number */ 4051 if (isdigit(**av)) { 4052 arg = strtonum(*av, 0, 0xffff, &errstr); 4053 if (errstr) 4054 errx(EX_DATAERR, 4055 "invalid rule number %s\n", *av); 4056 saved_arg = arg; 4057 if (co.use_set) 4058 arg |= (1 << 24) | ((co.use_set - 1) << 16); 4059 av++; 4060 ac--; 4061 if (do_cmd(optname, &arg, sizeof(arg))) { 4062 warn("rule %u: setsockopt(IP_FW_%s)", 4063 saved_arg, name); 4064 failed = EX_UNAVAILABLE; 4065 } else if (!co.do_quiet) 4066 printf("Entry %d %s.\n", saved_arg, 4067 optname == IP_FW_ZERO ? 4068 "cleared" : "logging count reset"); 4069 } else { 4070 errx(EX_USAGE, "invalid rule number ``%s''", *av); 4071 } 4072 } 4073 if (failed != EX_OK) 4074 exit(failed); 4075} 4076 4077void 4078ipfw_flush(int force) 4079{ 4080 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 4081 4082 if (!force && !co.do_quiet) { /* need to ask user */ 4083 int c; 4084 4085 printf("Are you sure? [yn] "); 4086 fflush(stdout); 4087 do { 4088 c = toupper(getc(stdin)); 4089 while (c != '\n' && getc(stdin) != '\n') 4090 if (feof(stdin)) 4091 return; /* and do not flush */ 4092 } while (c != 'Y' && c != 'N'); 4093 printf("\n"); 4094 if (c == 'N') /* user said no */ 4095 return; 4096 } 4097 if (co.do_pipe) { 4098 dummynet_flush(); 4099 return; 4100 } 4101 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 4102 if (co.use_set) { 4103 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 4104 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 4105 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 4106 } else if (do_cmd(cmd, NULL, 0) < 0) 4107 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 4108 co.do_pipe ? "DUMMYNET" : "FW"); 4109 if (!co.do_quiet) 4110 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 4111} 4112 4113 4114static void table_list(uint16_t num, int need_header); 4115static void table_fill_xentry(char *arg, ipfw_table_xentry *xent); 4116 4117/* 4118 * Retrieve maximum number of tables supported by ipfw(4) module. 4119 */ 4120uint32_t 4121ipfw_get_tables_max() 4122{ 4123 size_t len; 4124 uint32_t tables_max; 4125 4126 if (ipfw_tables_max != 0) 4127 return (ipfw_tables_max); 4128 4129 len = sizeof(tables_max); 4130 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 4131 NULL, 0) == -1) { 4132 if (co.test_only) 4133 tables_max = 128; /* Old conservative default */ 4134 else 4135 errx(1, "Can't determine maximum number of ipfw tables." 4136 " Perhaps you forgot to load ipfw module?"); 4137 } 4138 4139 ipfw_tables_max = tables_max; 4140 4141 return (ipfw_tables_max); 4142} 4143 4144/* 4145 * This one handles all table-related commands 4146 * ipfw table N add addr[/masklen] [value] 4147 * ipfw table N delete addr[/masklen] 4148 * ipfw table {N | all} flush 4149 * ipfw table {N | all} list 4150 */ 4151void 4152ipfw_table_handler(int ac, char *av[]) 4153{ 4154 ipfw_table_xentry xent; 4155 int do_add; 4156 int is_all; 4157 uint32_t a; 4158 uint32_t tables_max; 4159 4160 tables_max = ipfw_get_tables_max(); 4161 4162 memset(&xent, 0, sizeof(xent)); 4163 4164 ac--; av++; 4165 if (ac && isdigit(**av)) { 4166 xent.tbl = atoi(*av); 4167 is_all = 0; 4168 ac--; av++; 4169 } else if (ac && _substrcmp(*av, "all") == 0) { 4170 xent.tbl = 0; 4171 is_all = 1; 4172 ac--; av++; 4173 } else 4174 errx(EX_USAGE, "table number or 'all' keyword required"); 4175 if (xent.tbl >= tables_max) 4176 errx(EX_USAGE, "The table number exceeds the maximum allowed " 4177 "value (%d)", tables_max - 1); 4178 NEED1("table needs command"); 4179 if (is_all && _substrcmp(*av, "list") != 0 4180 && _substrcmp(*av, "flush") != 0) 4181 errx(EX_USAGE, "table number required"); 4182 4183 if (_substrcmp(*av, "add") == 0 || 4184 _substrcmp(*av, "delete") == 0) { 4185 do_add = **av == 'a'; 4186 ac--; av++; 4187 if (!ac) 4188 errx(EX_USAGE, "address required"); 4189 4190 table_fill_xentry(*av, &xent); 4191 4192 ac--; av++; 4193 if (do_add && ac) { 4194 unsigned int tval; 4195 /* isdigit is a bit of a hack here.. */ 4196 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 4197 xent.value = strtoul(*av, NULL, 0); 4198 } else { 4199 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 4200 /* The value must be stored in host order * 4201 * so that the values < 65k can be distinguished */ 4202 xent.value = ntohl(tval); 4203 } else { 4204 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 4205 } 4206 } 4207 } else 4208 xent.value = 0; 4209 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL, 4210 &xent, xent.len) < 0) { 4211 /* If running silent, don't bomb out on these errors. */ 4212 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 4213 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 4214 do_add ? "XADD" : "XDEL"); 4215 /* In silent mode, react to a failed add by deleting */ 4216 if (do_add) { 4217 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len); 4218 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0) 4219 err(EX_OSERR, 4220 "setsockopt(IP_FW_TABLE_XADD)"); 4221 } 4222 } 4223 } else if (_substrcmp(*av, "flush") == 0) { 4224 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1); 4225 do { 4226 if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl, 4227 sizeof(xent.tbl)) < 0) 4228 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 4229 } while (++xent.tbl < a); 4230 } else if (_substrcmp(*av, "list") == 0) { 4231 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1); 4232 do { 4233 table_list(xent.tbl, is_all); 4234 } while (++xent.tbl < a); 4235 } else 4236 errx(EX_USAGE, "invalid table command %s", *av); 4237} 4238 4239static void 4240table_fill_xentry(char *arg, ipfw_table_xentry *xent) 4241{ 4242 int addrlen, mask, masklen, type; 4243 struct in6_addr *paddr; 4244 uint32_t *pkey; 4245 char *p; 4246 uint32_t key; 4247 4248 mask = 0; 4249 type = 0; 4250 addrlen = 0; 4251 masklen = 0; 4252 4253 /* 4254 * Let's try to guess type by agrument. 4255 * Possible types: 4256 * 1) IPv4[/mask] 4257 * 2) IPv6[/mask] 4258 * 3) interface name 4259 * 4) port, uid/gid or other u32 key (base 10 format) 4260 * 5) hostname 4261 */ 4262 paddr = &xent->k.addr6; 4263 if (ishexnumber(*arg) != 0 || *arg == ':') { 4264 /* Remove / if exists */ 4265 if ((p = strchr(arg, '/')) != NULL) { 4266 *p = '\0'; 4267 mask = atoi(p + 1); 4268 } 4269 4270 if (inet_pton(AF_INET, arg, paddr) == 1) { 4271 if (p != NULL && mask > 32) 4272 errx(EX_DATAERR, "bad IPv4 mask width: %s", 4273 p + 1); 4274 4275 type = IPFW_TABLE_CIDR; 4276 masklen = p ? mask : 32; 4277 addrlen = sizeof(struct in_addr); 4278 } else if (inet_pton(AF_INET6, arg, paddr) == 1) { 4279 if (IN6_IS_ADDR_V4COMPAT(paddr)) 4280 errx(EX_DATAERR, 4281 "Use IPv4 instead of v4-compatible"); 4282 if (p != NULL && mask > 128) 4283 errx(EX_DATAERR, "bad IPv6 mask width: %s", 4284 p + 1); 4285 4286 type = IPFW_TABLE_CIDR; 4287 masklen = p ? mask : 128; 4288 addrlen = sizeof(struct in6_addr); 4289 } else { 4290 /* Port or any other key */ 4291 /* Skip non-base 10 entries like 'fa1' */ 4292 key = strtol(arg, &p, 10); 4293 if (*p == '\0') { 4294 pkey = (uint32_t *)paddr; 4295 *pkey = htonl(key); 4296 type = IPFW_TABLE_CIDR; 4297 masklen = 32; 4298 addrlen = sizeof(uint32_t); 4299 } else if ((p != arg) && (*p == '.')) { 4300 /* 4301 * Warn on IPv4 address strings 4302 * which are "valid" for inet_aton() but not 4303 * in inet_pton(). 4304 * 4305 * Typical examples: '10.5' or '10.0.0.05' 4306 */ 4307 errx(EX_DATAERR, 4308 "Invalid IPv4 address: %s", arg); 4309 } 4310 } 4311 } 4312 4313 if (type == 0 && strchr(arg, '.') == NULL) { 4314 /* Assume interface name. Copy significant data only */ 4315 mask = MIN(strlen(arg), IF_NAMESIZE - 1); 4316 memcpy(xent->k.iface, arg, mask); 4317 /* Set mask to exact match */ 4318 masklen = 8 * IF_NAMESIZE; 4319 type = IPFW_TABLE_INTERFACE; 4320 addrlen = IF_NAMESIZE; 4321 } 4322 4323 if (type == 0) { 4324 if (lookup_host(arg, (struct in_addr *)paddr) != 0) 4325 errx(EX_NOHOST, "hostname ``%s'' unknown", arg); 4326 4327 masklen = 32; 4328 type = IPFW_TABLE_CIDR; 4329 addrlen = sizeof(struct in_addr); 4330 } 4331 4332 xent->type = type; 4333 xent->masklen = masklen; 4334 xent->len = offsetof(ipfw_table_xentry, k) + addrlen; 4335} 4336 4337static void 4338table_list(uint16_t num, int need_header) 4339{ 4340 ipfw_xtable *tbl; 4341 ipfw_table_xentry *xent; 4342 socklen_t l; 4343 uint32_t *a, sz, tval; 4344 char tbuf[128]; 4345 struct in6_addr *addr6; 4346 ip_fw3_opheader *op3; 4347 4348 /* Prepend value with IP_FW3 header */ 4349 l = sizeof(ip_fw3_opheader) + sizeof(uint32_t); 4350 op3 = alloca(l); 4351 /* Zero reserved fields */ 4352 memset(op3, 0, sizeof(ip_fw3_opheader)); 4353 a = (uint32_t *)(op3 + 1); 4354 *a = num; 4355 op3->opcode = IP_FW_TABLE_XGETSIZE; 4356 if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0) 4357 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)"); 4358 4359 /* If a is zero we have nothing to do, the table is empty. */ 4360 if (*a == 0) 4361 return; 4362 4363 l = *a; 4364 tbl = safe_calloc(1, l); 4365 tbl->opheader.opcode = IP_FW_TABLE_XLIST; 4366 tbl->tbl = num; 4367 if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0) 4368 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)"); 4369 if (tbl->cnt && need_header) 4370 printf("---table(%d)---\n", tbl->tbl); 4371 sz = tbl->size - sizeof(ipfw_xtable); 4372 xent = &tbl->xent[0]; 4373 while (sz > 0) { 4374 switch (tbl->type) { 4375 case IPFW_TABLE_CIDR: 4376 /* IPv4 or IPv6 prefixes */ 4377 tval = xent->value; 4378 addr6 = &xent->k.addr6; 4379 4380 4381 if (IN6_IS_ADDR_V4COMPAT(addr6)) { 4382 /* IPv4 address */ 4383 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf)); 4384 } else { 4385 /* IPv6 address */ 4386 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf)); 4387 } 4388 4389 if (co.do_value_as_ip) { 4390 tval = htonl(tval); 4391 printf("%s/%u %s\n", tbuf, xent->masklen, 4392 inet_ntoa(*(struct in_addr *)&tval)); 4393 } else 4394 printf("%s/%u %u\n", tbuf, xent->masklen, tval); 4395 break; 4396 case IPFW_TABLE_INTERFACE: 4397 /* Interface names */ 4398 tval = xent->value; 4399 if (co.do_value_as_ip) { 4400 tval = htonl(tval); 4401 printf("%s %s\n", xent->k.iface, 4402 inet_ntoa(*(struct in_addr *)&tval)); 4403 } else 4404 printf("%s %u\n", xent->k.iface, tval); 4405 } 4406 4407 if (sz < xent->len) 4408 break; 4409 sz -= xent->len; 4410 xent = (void *)xent + xent->len; 4411 } 4412 4413 free(tbl); 4414} 4415