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 57 struct cmdline_opts co; /* global options */ 58 59 int resvd_set_number = RESVD_SET; 60 61 int ipfw_socket = -1; 62 63 uint32_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) 113 114 static void 115 PRINT_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 } 124 125 static 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 }; 135 136 static 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 */ 152 static 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 }; 160 161 static 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 }; 171 172 static 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 }; 197 198 static 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 212 static 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 }; 239 240 241 static 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 }; 273 274 static 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 */ 287 static int lookup_key[] = { 288 TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, 289 TOK_UID, TOK_JAIL, TOK_DSCP, -1 }; 290 291 static 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 */ 379 int 380 pr_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 } 397 398 void * 399 safe_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 } 407 408 void * 409 safe_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 */ 422 int 423 do_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 */ 460 static int 461 do_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 */ 488 int 489 match_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 */ 504 char const * 505 match_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 */ 522 int 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 bizarre construction 542 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 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 */ 550 int 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 */ 566 static void 567 print_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 } 590 591 static 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 */ 608 static void 609 print_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 */ 642 static int 643 strtoport(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 */ 700 static int 701 fill_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 */ 749 static void 750 fill_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 } 790 791 static 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 }; 810 811 static void 812 fill_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 } 825 826 static void 827 print_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 */ 848 int 849 contigmask(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 */ 866 static void 867 print_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 */ 897 static void 898 print_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 */ 991 static void 992 print_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 1010 static void 1011 fill_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 1034 static void 1035 print_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 1049 static void 1050 print_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 1096 static void 1097 show_prerequisites(int *flags, int want, int cmd) 1098 { 1099 (void)cmd; /* UNUSED */ 1100 if (co.comment_only) 1101 return; 1102 if ( (*flags & HAVE_IP) == HAVE_IP) 1103 *flags |= HAVE_OPTIONS; 1104 1105 if ( !(*flags & HAVE_OPTIONS)) { 1106 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 1107 if ( (*flags & HAVE_PROTO4)) 1108 printf(" ip4"); 1109 else if ( (*flags & HAVE_PROTO6)) 1110 printf(" ip6"); 1111 else 1112 printf(" ip"); 1113 } 1114 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 1115 printf(" from any"); 1116 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 1117 printf(" to any"); 1118 } 1119 *flags |= want; 1120 } 1121 1122 static void 1123 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 1124 { 1125 static int twidth = 0; 1126 int l; 1127 ipfw_insn *cmd, *tagptr = NULL; 1128 const char *comment = NULL; /* ptr to comment if we have one */ 1129 int proto = 0; /* default */ 1130 int flags = 0; /* prerequisites */ 1131 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 1132 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 1133 int or_block = 0; /* we are in an or block */ 1134 uint32_t set_disable; 1135 1136 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 1137 1138 if (set_disable & (1 << rule->set)) { /* disabled */ 1139 if (!co.show_sets) 1140 return; 1141 else 1142 printf("# DISABLED "); 1143 } 1144 printf("%05u ", rule->rulenum); 1145 1146 if (pcwidth > 0 || bcwidth > 0) { 1147 pr_u64(&rule->pcnt, pcwidth); 1148 pr_u64(&rule->bcnt, bcwidth); 1149 } 1150 1151 if (co.do_time == 2) 1152 printf("%10u ", rule->timestamp); 1153 else if (co.do_time == 1) { 1154 char timestr[30]; 1155 time_t t = (time_t)0; 1156 1157 if (twidth == 0) { 1158 strcpy(timestr, ctime(&t)); 1159 *strchr(timestr, '\n') = '\0'; 1160 twidth = strlen(timestr); 1161 } 1162 if (rule->timestamp) { 1163 t = _long_to_time(rule->timestamp); 1164 1165 strcpy(timestr, ctime(&t)); 1166 *strchr(timestr, '\n') = '\0'; 1167 printf("%s ", timestr); 1168 } else { 1169 printf("%*s", twidth, " "); 1170 } 1171 } 1172 1173 if (co.show_sets) 1174 printf("set %d ", rule->set); 1175 1176 /* 1177 * print the optional "match probability" 1178 */ 1179 if (rule->cmd_len > 0) { 1180 cmd = rule->cmd ; 1181 if (cmd->opcode == O_PROB) { 1182 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1183 double d = 1.0 * p->d[0]; 1184 1185 d = (d / 0x7fffffff); 1186 printf("prob %f ", d); 1187 } 1188 } 1189 1190 /* 1191 * first print actions 1192 */ 1193 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1194 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1195 switch(cmd->opcode) { 1196 case O_CHECK_STATE: 1197 printf("check-state"); 1198 /* avoid printing anything else */ 1199 flags = HAVE_PROTO | HAVE_SRCIP | 1200 HAVE_DSTIP | HAVE_IP; 1201 break; 1202 1203 case O_ACCEPT: 1204 printf("allow"); 1205 break; 1206 1207 case O_COUNT: 1208 printf("count"); 1209 break; 1210 1211 case O_DENY: 1212 printf("deny"); 1213 break; 1214 1215 case O_REJECT: 1216 if (cmd->arg1 == ICMP_REJECT_RST) 1217 printf("reset"); 1218 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1219 printf("reject"); 1220 else 1221 print_reject_code(cmd->arg1); 1222 break; 1223 1224 case O_UNREACH6: 1225 if (cmd->arg1 == ICMP6_UNREACH_RST) 1226 printf("reset6"); 1227 else 1228 print_unreach6_code(cmd->arg1); 1229 break; 1230 1231 case O_SKIPTO: 1232 PRINT_UINT_ARG("skipto ", cmd->arg1); 1233 break; 1234 1235 case O_PIPE: 1236 PRINT_UINT_ARG("pipe ", cmd->arg1); 1237 break; 1238 1239 case O_QUEUE: 1240 PRINT_UINT_ARG("queue ", cmd->arg1); 1241 break; 1242 1243 case O_DIVERT: 1244 PRINT_UINT_ARG("divert ", cmd->arg1); 1245 break; 1246 1247 case O_TEE: 1248 PRINT_UINT_ARG("tee ", cmd->arg1); 1249 break; 1250 1251 case O_NETGRAPH: 1252 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1253 break; 1254 1255 case O_NGTEE: 1256 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1257 break; 1258 1259 case O_FORWARD_IP: 1260 { 1261 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1262 1263 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1264 printf("fwd tablearg"); 1265 } else { 1266 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1267 } 1268 if (s->sa.sin_port) 1269 printf(",%d", s->sa.sin_port); 1270 } 1271 break; 1272 1273 case O_FORWARD_IP6: 1274 { 1275 char buf[4 + INET6_ADDRSTRLEN + 1]; 1276 ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd; 1277 1278 printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr, 1279 buf, sizeof(buf))); 1280 if (s->sa.sin6_port) 1281 printf(",%d", s->sa.sin6_port); 1282 } 1283 break; 1284 1285 case O_LOG: /* O_LOG is printed last */ 1286 logptr = (ipfw_insn_log *)cmd; 1287 break; 1288 1289 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1290 altqptr = (ipfw_insn_altq *)cmd; 1291 break; 1292 1293 case O_TAG: 1294 tagptr = cmd; 1295 break; 1296 1297 case O_NAT: 1298 if (cmd->arg1 != 0) 1299 PRINT_UINT_ARG("nat ", cmd->arg1); 1300 else 1301 printf("nat global"); 1302 break; 1303 1304 case O_SETFIB: 1305 PRINT_UINT_ARG("setfib ", cmd->arg1); 1306 break; 1307 1308 case O_SETDSCP: 1309 { 1310 const char *code; 1311 1312 if ((code = match_value(f_ipdscp, cmd->arg1)) != NULL) 1313 printf("setdscp %s", code); 1314 else 1315 PRINT_UINT_ARG("setdscp ", cmd->arg1); 1316 } 1317 break; 1318 1319 case O_REASS: 1320 printf("reass"); 1321 break; 1322 1323 case O_CALLRETURN: 1324 if (cmd->len & F_NOT) 1325 printf("return"); 1326 else 1327 PRINT_UINT_ARG("call ", cmd->arg1); 1328 break; 1329 1330 default: 1331 printf("** unrecognized action %d len %d ", 1332 cmd->opcode, cmd->len); 1333 } 1334 } 1335 if (logptr) { 1336 if (logptr->max_log > 0) 1337 printf(" log logamount %d", logptr->max_log); 1338 else 1339 printf(" log"); 1340 } 1341 #ifndef NO_ALTQ 1342 if (altqptr) { 1343 print_altq_cmd(altqptr); 1344 } 1345 #endif 1346 if (tagptr) { 1347 if (tagptr->len & F_NOT) 1348 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1349 else 1350 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1351 } 1352 1353 /* 1354 * then print the body. 1355 */ 1356 for (l = rule->act_ofs, cmd = rule->cmd ; 1357 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1358 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1359 continue; 1360 if (cmd->opcode == O_IP4) { 1361 flags |= HAVE_PROTO4; 1362 break; 1363 } else if (cmd->opcode == O_IP6) { 1364 flags |= HAVE_PROTO6; 1365 break; 1366 } 1367 } 1368 if (rule->_pad & 1) { /* empty rules before options */ 1369 if (!co.do_compact) { 1370 show_prerequisites(&flags, HAVE_PROTO, 0); 1371 printf(" from any to any"); 1372 } 1373 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | 1374 HAVE_SRCIP | HAVE_DSTIP; 1375 } 1376 1377 if (co.comment_only) 1378 comment = "..."; 1379 1380 for (l = rule->act_ofs, cmd = rule->cmd ; 1381 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1382 /* useful alias */ 1383 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1384 1385 if (co.comment_only) { 1386 if (cmd->opcode != O_NOP) 1387 continue; 1388 printf(" // %s\n", (char *)(cmd + 1)); 1389 return; 1390 } 1391 1392 show_prerequisites(&flags, 0, cmd->opcode); 1393 1394 switch(cmd->opcode) { 1395 case O_PROB: 1396 break; /* done already */ 1397 1398 case O_PROBE_STATE: 1399 break; /* no need to print anything here */ 1400 1401 case O_IP_SRC: 1402 case O_IP_SRC_LOOKUP: 1403 case O_IP_SRC_MASK: 1404 case O_IP_SRC_ME: 1405 case O_IP_SRC_SET: 1406 show_prerequisites(&flags, HAVE_PROTO, 0); 1407 if (!(flags & HAVE_SRCIP)) 1408 printf(" from"); 1409 if ((cmd->len & F_OR) && !or_block) 1410 printf(" {"); 1411 print_ip((ipfw_insn_ip *)cmd, 1412 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1413 flags |= HAVE_SRCIP; 1414 break; 1415 1416 case O_IP_DST: 1417 case O_IP_DST_LOOKUP: 1418 case O_IP_DST_MASK: 1419 case O_IP_DST_ME: 1420 case O_IP_DST_SET: 1421 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1422 if (!(flags & HAVE_DSTIP)) 1423 printf(" to"); 1424 if ((cmd->len & F_OR) && !or_block) 1425 printf(" {"); 1426 print_ip((ipfw_insn_ip *)cmd, 1427 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1428 flags |= HAVE_DSTIP; 1429 break; 1430 1431 case O_IP6_SRC: 1432 case O_IP6_SRC_MASK: 1433 case O_IP6_SRC_ME: 1434 show_prerequisites(&flags, HAVE_PROTO, 0); 1435 if (!(flags & HAVE_SRCIP)) 1436 printf(" from"); 1437 if ((cmd->len & F_OR) && !or_block) 1438 printf(" {"); 1439 print_ip6((ipfw_insn_ip6 *)cmd, 1440 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1441 flags |= HAVE_SRCIP | HAVE_PROTO; 1442 break; 1443 1444 case O_IP6_DST: 1445 case O_IP6_DST_MASK: 1446 case O_IP6_DST_ME: 1447 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1448 if (!(flags & HAVE_DSTIP)) 1449 printf(" to"); 1450 if ((cmd->len & F_OR) && !or_block) 1451 printf(" {"); 1452 print_ip6((ipfw_insn_ip6 *)cmd, 1453 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1454 flags |= HAVE_DSTIP; 1455 break; 1456 1457 case O_FLOW6ID: 1458 print_flow6id( (ipfw_insn_u32 *) cmd ); 1459 flags |= HAVE_OPTIONS; 1460 break; 1461 1462 case O_IP_DSTPORT: 1463 show_prerequisites(&flags, 1464 HAVE_PROTO | HAVE_SRCIP | 1465 HAVE_DSTIP | HAVE_IP, 0); 1466 case O_IP_SRCPORT: 1467 if (flags & HAVE_DSTIP) 1468 flags |= HAVE_IP; 1469 show_prerequisites(&flags, 1470 HAVE_PROTO | HAVE_SRCIP, 0); 1471 if ((cmd->len & F_OR) && !or_block) 1472 printf(" {"); 1473 if (cmd->len & F_NOT) 1474 printf(" not"); 1475 print_newports((ipfw_insn_u16 *)cmd, proto, 1476 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1477 break; 1478 1479 case O_PROTO: { 1480 struct protoent *pe = NULL; 1481 1482 if ((cmd->len & F_OR) && !or_block) 1483 printf(" {"); 1484 if (cmd->len & F_NOT) 1485 printf(" not"); 1486 proto = cmd->arg1; 1487 pe = getprotobynumber(cmd->arg1); 1488 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1489 !(flags & HAVE_PROTO)) 1490 show_prerequisites(&flags, 1491 HAVE_PROTO | HAVE_IP | HAVE_SRCIP | 1492 HAVE_DSTIP | HAVE_OPTIONS, 0); 1493 if (flags & HAVE_OPTIONS) 1494 printf(" proto"); 1495 if (pe) 1496 printf(" %s", pe->p_name); 1497 else 1498 printf(" %u", cmd->arg1); 1499 } 1500 flags |= HAVE_PROTO; 1501 break; 1502 1503 default: /*options ... */ 1504 if (!(cmd->len & (F_OR|F_NOT))) 1505 if (((cmd->opcode == O_IP6) && 1506 (flags & HAVE_PROTO6)) || 1507 ((cmd->opcode == O_IP4) && 1508 (flags & HAVE_PROTO4))) 1509 break; 1510 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | 1511 HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); 1512 if ((cmd->len & F_OR) && !or_block) 1513 printf(" {"); 1514 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1515 printf(" not"); 1516 switch(cmd->opcode) { 1517 case O_MACADDR2: { 1518 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1519 1520 printf(" MAC"); 1521 print_mac(m->addr, m->mask); 1522 print_mac(m->addr + 6, m->mask + 6); 1523 } 1524 break; 1525 1526 case O_MAC_TYPE: 1527 print_newports((ipfw_insn_u16 *)cmd, 1528 IPPROTO_ETHERTYPE, cmd->opcode); 1529 break; 1530 1531 1532 case O_FRAG: 1533 printf(" frag"); 1534 break; 1535 1536 case O_FIB: 1537 printf(" fib %u", cmd->arg1 ); 1538 break; 1539 case O_SOCKARG: 1540 printf(" sockarg"); 1541 break; 1542 1543 case O_IN: 1544 printf(cmd->len & F_NOT ? " out" : " in"); 1545 break; 1546 1547 case O_DIVERTED: 1548 switch (cmd->arg1) { 1549 case 3: 1550 printf(" diverted"); 1551 break; 1552 case 1: 1553 printf(" diverted-loopback"); 1554 break; 1555 case 2: 1556 printf(" diverted-output"); 1557 break; 1558 default: 1559 printf(" diverted-?<%u>", cmd->arg1); 1560 break; 1561 } 1562 break; 1563 1564 case O_LAYER2: 1565 printf(" layer2"); 1566 break; 1567 case O_XMIT: 1568 case O_RECV: 1569 case O_VIA: 1570 { 1571 char const *s; 1572 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1573 1574 if (cmd->opcode == O_XMIT) 1575 s = "xmit"; 1576 else if (cmd->opcode == O_RECV) 1577 s = "recv"; 1578 else /* if (cmd->opcode == O_VIA) */ 1579 s = "via"; 1580 if (cmdif->name[0] == '\0') 1581 printf(" %s %s", s, 1582 inet_ntoa(cmdif->p.ip)); 1583 else if (cmdif->name[0] == '\1') /* interface table */ 1584 printf(" %s table(%d)", s, cmdif->p.glob); 1585 else 1586 printf(" %s %s", s, cmdif->name); 1587 1588 break; 1589 } 1590 case O_IPID: 1591 if (F_LEN(cmd) == 1) 1592 printf(" ipid %u", cmd->arg1 ); 1593 else 1594 print_newports((ipfw_insn_u16 *)cmd, 0, 1595 O_IPID); 1596 break; 1597 1598 case O_IPTTL: 1599 if (F_LEN(cmd) == 1) 1600 printf(" ipttl %u", cmd->arg1 ); 1601 else 1602 print_newports((ipfw_insn_u16 *)cmd, 0, 1603 O_IPTTL); 1604 break; 1605 1606 case O_IPVER: 1607 printf(" ipver %u", cmd->arg1 ); 1608 break; 1609 1610 case O_IPPRECEDENCE: 1611 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1612 break; 1613 1614 case O_DSCP: 1615 print_dscp((ipfw_insn_u32 *)cmd); 1616 break; 1617 1618 case O_IPLEN: 1619 if (F_LEN(cmd) == 1) 1620 printf(" iplen %u", cmd->arg1 ); 1621 else 1622 print_newports((ipfw_insn_u16 *)cmd, 0, 1623 O_IPLEN); 1624 break; 1625 1626 case O_IPOPT: 1627 print_flags("ipoptions", cmd, f_ipopts); 1628 break; 1629 1630 case O_IPTOS: 1631 print_flags("iptos", cmd, f_iptos); 1632 break; 1633 1634 case O_ICMPTYPE: 1635 print_icmptypes((ipfw_insn_u32 *)cmd); 1636 break; 1637 1638 case O_ESTAB: 1639 printf(" established"); 1640 break; 1641 1642 case O_TCPDATALEN: 1643 if (F_LEN(cmd) == 1) 1644 printf(" tcpdatalen %u", cmd->arg1 ); 1645 else 1646 print_newports((ipfw_insn_u16 *)cmd, 0, 1647 O_TCPDATALEN); 1648 break; 1649 1650 case O_TCPFLAGS: 1651 print_flags("tcpflags", cmd, f_tcpflags); 1652 break; 1653 1654 case O_TCPOPTS: 1655 print_flags("tcpoptions", cmd, f_tcpopts); 1656 break; 1657 1658 case O_TCPWIN: 1659 if (F_LEN(cmd) == 1) 1660 printf(" tcpwin %u", cmd->arg1); 1661 else 1662 print_newports((ipfw_insn_u16 *)cmd, 0, 1663 O_TCPWIN); 1664 break; 1665 1666 case O_TCPACK: 1667 printf(" tcpack %d", ntohl(cmd32->d[0])); 1668 break; 1669 1670 case O_TCPSEQ: 1671 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1672 break; 1673 1674 case O_UID: 1675 { 1676 struct passwd *pwd = getpwuid(cmd32->d[0]); 1677 1678 if (pwd) 1679 printf(" uid %s", pwd->pw_name); 1680 else 1681 printf(" uid %u", cmd32->d[0]); 1682 } 1683 break; 1684 1685 case O_GID: 1686 { 1687 struct group *grp = getgrgid(cmd32->d[0]); 1688 1689 if (grp) 1690 printf(" gid %s", grp->gr_name); 1691 else 1692 printf(" gid %u", cmd32->d[0]); 1693 } 1694 break; 1695 1696 case O_JAIL: 1697 printf(" jail %d", cmd32->d[0]); 1698 break; 1699 1700 case O_VERREVPATH: 1701 printf(" verrevpath"); 1702 break; 1703 1704 case O_VERSRCREACH: 1705 printf(" versrcreach"); 1706 break; 1707 1708 case O_ANTISPOOF: 1709 printf(" antispoof"); 1710 break; 1711 1712 case O_IPSEC: 1713 printf(" ipsec"); 1714 break; 1715 1716 case O_NOP: 1717 comment = (char *)(cmd + 1); 1718 break; 1719 1720 case O_KEEP_STATE: 1721 printf(" keep-state"); 1722 break; 1723 1724 case O_LIMIT: { 1725 struct _s_x *p = limit_masks; 1726 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1727 uint8_t x = c->limit_mask; 1728 char const *comma = " "; 1729 1730 printf(" limit"); 1731 for (; p->x != 0 ; p++) 1732 if ((x & p->x) == p->x) { 1733 x &= ~p->x; 1734 printf("%s%s", comma, p->s); 1735 comma = ","; 1736 } 1737 PRINT_UINT_ARG(" ", c->conn_limit); 1738 break; 1739 } 1740 1741 case O_IP6: 1742 printf(" ip6"); 1743 break; 1744 1745 case O_IP4: 1746 printf(" ip4"); 1747 break; 1748 1749 case O_ICMP6TYPE: 1750 print_icmp6types((ipfw_insn_u32 *)cmd); 1751 break; 1752 1753 case O_EXT_HDR: 1754 print_ext6hdr( (ipfw_insn *) cmd ); 1755 break; 1756 1757 case O_TAGGED: 1758 if (F_LEN(cmd) == 1) 1759 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1760 else 1761 print_newports((ipfw_insn_u16 *)cmd, 0, 1762 O_TAGGED); 1763 break; 1764 1765 default: 1766 printf(" [opcode %d len %d]", 1767 cmd->opcode, cmd->len); 1768 } 1769 } 1770 if (cmd->len & F_OR) { 1771 printf(" or"); 1772 or_block = 1; 1773 } else if (or_block) { 1774 printf(" }"); 1775 or_block = 0; 1776 } 1777 } 1778 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP 1779 | HAVE_IP, 0); 1780 if (comment) 1781 printf(" // %s", comment); 1782 printf("\n"); 1783 } 1784 1785 static void 1786 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1787 { 1788 struct protoent *pe; 1789 struct in_addr a; 1790 uint16_t rulenum; 1791 char buf[INET6_ADDRSTRLEN]; 1792 1793 if (!co.do_expired) { 1794 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1795 return; 1796 } 1797 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1798 printf("%05d", rulenum); 1799 if (pcwidth > 0 || bcwidth > 0) { 1800 printf(" "); 1801 pr_u64(&d->pcnt, pcwidth); 1802 pr_u64(&d->bcnt, bcwidth); 1803 printf("(%ds)", d->expire); 1804 } 1805 switch (d->dyn_type) { 1806 case O_LIMIT_PARENT: 1807 printf(" PARENT %d", d->count); 1808 break; 1809 case O_LIMIT: 1810 printf(" LIMIT"); 1811 break; 1812 case O_KEEP_STATE: /* bidir, no mask */ 1813 printf(" STATE"); 1814 break; 1815 } 1816 1817 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1818 printf(" %s", pe->p_name); 1819 else 1820 printf(" proto %u", d->id.proto); 1821 1822 if (d->id.addr_type == 4) { 1823 a.s_addr = htonl(d->id.src_ip); 1824 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1825 1826 a.s_addr = htonl(d->id.dst_ip); 1827 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1828 } else if (d->id.addr_type == 6) { 1829 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1830 sizeof(buf)), d->id.src_port); 1831 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1832 sizeof(buf)), d->id.dst_port); 1833 } else 1834 printf(" UNKNOWN <-> UNKNOWN\n"); 1835 1836 printf("\n"); 1837 } 1838 1839 /* 1840 * This one handles all set-related commands 1841 * ipfw set { show | enable | disable } 1842 * ipfw set swap X Y 1843 * ipfw set move X to Y 1844 * ipfw set move rule X to Y 1845 */ 1846 void 1847 ipfw_sets_handler(char *av[]) 1848 { 1849 uint32_t set_disable, masks[2]; 1850 int i, nbytes; 1851 uint16_t rulenum; 1852 uint8_t cmd, new_set; 1853 1854 av++; 1855 1856 if (av[0] == NULL) 1857 errx(EX_USAGE, "set needs command"); 1858 if (_substrcmp(*av, "show") == 0) { 1859 void *data = NULL; 1860 char const *msg; 1861 int nalloc; 1862 1863 nalloc = nbytes = sizeof(struct ip_fw); 1864 while (nbytes >= nalloc) { 1865 if (data) 1866 free(data); 1867 nalloc = nalloc * 2 + 200; 1868 nbytes = nalloc; 1869 data = safe_calloc(1, nbytes); 1870 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1871 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1872 } 1873 1874 bcopy(&((struct ip_fw *)data)->next_rule, 1875 &set_disable, sizeof(set_disable)); 1876 1877 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1878 if ((set_disable & (1<<i))) { 1879 printf("%s %d", msg, i); 1880 msg = ""; 1881 } 1882 msg = (set_disable) ? " enable" : "enable"; 1883 for (i = 0; i < RESVD_SET; i++) 1884 if (!(set_disable & (1<<i))) { 1885 printf("%s %d", msg, i); 1886 msg = ""; 1887 } 1888 printf("\n"); 1889 } else if (_substrcmp(*av, "swap") == 0) { 1890 av++; 1891 if ( av[0] == NULL || av[1] == NULL ) 1892 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1893 rulenum = atoi(av[0]); 1894 new_set = atoi(av[1]); 1895 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1896 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1897 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1898 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1899 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1900 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1901 } else if (_substrcmp(*av, "move") == 0) { 1902 av++; 1903 if (av[0] && _substrcmp(*av, "rule") == 0) { 1904 cmd = 2; 1905 av++; 1906 } else 1907 cmd = 3; 1908 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 1909 av[3] != NULL || _substrcmp(av[1], "to") != 0) 1910 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1911 rulenum = atoi(av[0]); 1912 new_set = atoi(av[2]); 1913 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1914 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1915 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1916 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1917 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1918 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1919 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1920 } else if (_substrcmp(*av, "disable") == 0 || 1921 _substrcmp(*av, "enable") == 0 ) { 1922 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1923 1924 av++; 1925 masks[0] = masks[1] = 0; 1926 1927 while (av[0]) { 1928 if (isdigit(**av)) { 1929 i = atoi(*av); 1930 if (i < 0 || i > RESVD_SET) 1931 errx(EX_DATAERR, 1932 "invalid set number %d\n", i); 1933 masks[which] |= (1<<i); 1934 } else if (_substrcmp(*av, "disable") == 0) 1935 which = 0; 1936 else if (_substrcmp(*av, "enable") == 0) 1937 which = 1; 1938 else 1939 errx(EX_DATAERR, 1940 "invalid set command %s\n", *av); 1941 av++; 1942 } 1943 if ( (masks[0] & masks[1]) != 0 ) 1944 errx(EX_DATAERR, 1945 "cannot enable and disable the same set\n"); 1946 1947 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1948 if (i) 1949 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1950 } else 1951 errx(EX_USAGE, "invalid set command %s\n", *av); 1952 } 1953 1954 void 1955 ipfw_sysctl_handler(char *av[], int which) 1956 { 1957 av++; 1958 1959 if (av[0] == NULL) { 1960 warnx("missing keyword to enable/disable\n"); 1961 } else if (_substrcmp(*av, "firewall") == 0) { 1962 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1963 &which, sizeof(which)); 1964 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 1965 &which, sizeof(which)); 1966 } else if (_substrcmp(*av, "one_pass") == 0) { 1967 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1968 &which, sizeof(which)); 1969 } else if (_substrcmp(*av, "debug") == 0) { 1970 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1971 &which, sizeof(which)); 1972 } else if (_substrcmp(*av, "verbose") == 0) { 1973 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1974 &which, sizeof(which)); 1975 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1976 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1977 &which, sizeof(which)); 1978 #ifndef NO_ALTQ 1979 } else if (_substrcmp(*av, "altq") == 0) { 1980 altq_set_enabled(which); 1981 #endif 1982 } else { 1983 warnx("unrecognize enable/disable keyword: %s\n", *av); 1984 } 1985 } 1986 1987 void 1988 ipfw_list(int ac, char *av[], int show_counters) 1989 { 1990 struct ip_fw *r; 1991 ipfw_dyn_rule *dynrules, *d; 1992 1993 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1994 char *lim; 1995 void *data = NULL; 1996 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1997 int exitval = EX_OK; 1998 int lac; 1999 char **lav; 2000 u_long rnum, last; 2001 char *endptr; 2002 int seen = 0; 2003 uint8_t set; 2004 2005 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 2006 int nalloc = 1024; /* start somewhere... */ 2007 2008 last = 0; 2009 2010 if (co.test_only) { 2011 fprintf(stderr, "Testing only, list disabled\n"); 2012 return; 2013 } 2014 if (co.do_pipe) { 2015 dummynet_list(ac, av, show_counters); 2016 return; 2017 } 2018 2019 ac--; 2020 av++; 2021 2022 /* get rules or pipes from kernel, resizing array as necessary */ 2023 nbytes = nalloc; 2024 2025 while (nbytes >= nalloc) { 2026 nalloc = nalloc * 2 + 200; 2027 nbytes = nalloc; 2028 data = safe_realloc(data, nbytes); 2029 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 2030 err(EX_OSERR, "getsockopt(IP_%s_GET)", 2031 co.do_pipe ? "DUMMYNET" : "FW"); 2032 } 2033 2034 /* 2035 * Count static rules. They have variable size so we 2036 * need to scan the list to count them. 2037 */ 2038 for (nstat = 1, r = data, lim = (char *)data + nbytes; 2039 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 2040 ++nstat, r = NEXT(r) ) 2041 ; /* nothing */ 2042 2043 /* 2044 * Count dynamic rules. This is easier as they have 2045 * fixed size. 2046 */ 2047 r = NEXT(r); 2048 dynrules = (ipfw_dyn_rule *)r ; 2049 n = (char *)r - (char *)data; 2050 ndyn = (nbytes - n) / sizeof *dynrules; 2051 2052 /* if showing stats, figure out column widths ahead of time */ 2053 bcwidth = pcwidth = 0; 2054 if (show_counters) { 2055 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 2056 /* skip rules from another set */ 2057 if (co.use_set && r->set != co.use_set - 1) 2058 continue; 2059 2060 /* packet counter */ 2061 width = pr_u64(&r->pcnt, 0); 2062 if (width > pcwidth) 2063 pcwidth = width; 2064 2065 /* byte counter */ 2066 width = pr_u64(&r->bcnt, 0); 2067 if (width > bcwidth) 2068 bcwidth = width; 2069 } 2070 } 2071 if (co.do_dynamic && ndyn) { 2072 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2073 if (co.use_set) { 2074 /* skip rules from another set */ 2075 bcopy((char *)&d->rule + sizeof(uint16_t), 2076 &set, sizeof(uint8_t)); 2077 if (set != co.use_set - 1) 2078 continue; 2079 } 2080 width = pr_u64(&d->pcnt, 0); 2081 if (width > pcwidth) 2082 pcwidth = width; 2083 2084 width = pr_u64(&d->bcnt, 0); 2085 if (width > bcwidth) 2086 bcwidth = width; 2087 } 2088 } 2089 /* if no rule numbers were specified, list all rules */ 2090 if (ac == 0) { 2091 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 2092 if (co.use_set && r->set != co.use_set - 1) 2093 continue; 2094 show_ipfw(r, pcwidth, bcwidth); 2095 } 2096 2097 if (co.do_dynamic && ndyn) { 2098 printf("## Dynamic rules (%d):\n", ndyn); 2099 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2100 if (co.use_set) { 2101 bcopy((char *)&d->rule + sizeof(uint16_t), 2102 &set, sizeof(uint8_t)); 2103 if (set != co.use_set - 1) 2104 continue; 2105 } 2106 show_dyn_ipfw(d, pcwidth, bcwidth); 2107 } 2108 } 2109 goto done; 2110 } 2111 2112 /* display specific rules requested on command line */ 2113 2114 for (lac = ac, lav = av; lac != 0; lac--) { 2115 /* convert command line rule # */ 2116 last = rnum = strtoul(*lav++, &endptr, 10); 2117 if (*endptr == '-') 2118 last = strtoul(endptr+1, &endptr, 10); 2119 if (*endptr) { 2120 exitval = EX_USAGE; 2121 warnx("invalid rule number: %s", *(lav - 1)); 2122 continue; 2123 } 2124 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 2125 if (r->rulenum > last) 2126 break; 2127 if (co.use_set && r->set != co.use_set - 1) 2128 continue; 2129 if (r->rulenum >= rnum && r->rulenum <= last) { 2130 show_ipfw(r, pcwidth, bcwidth); 2131 seen = 1; 2132 } 2133 } 2134 if (!seen) { 2135 /* give precedence to other error(s) */ 2136 if (exitval == EX_OK) 2137 exitval = EX_UNAVAILABLE; 2138 warnx("rule %lu does not exist", rnum); 2139 } 2140 } 2141 2142 if (co.do_dynamic && ndyn) { 2143 printf("## Dynamic rules:\n"); 2144 for (lac = ac, lav = av; lac != 0; lac--) { 2145 last = rnum = strtoul(*lav++, &endptr, 10); 2146 if (*endptr == '-') 2147 last = strtoul(endptr+1, &endptr, 10); 2148 if (*endptr) 2149 /* already warned */ 2150 continue; 2151 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 2152 uint16_t rulenum; 2153 2154 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2155 if (rulenum > rnum) 2156 break; 2157 if (co.use_set) { 2158 bcopy((char *)&d->rule + sizeof(uint16_t), 2159 &set, sizeof(uint8_t)); 2160 if (set != co.use_set - 1) 2161 continue; 2162 } 2163 if (r->rulenum >= rnum && r->rulenum <= last) 2164 show_dyn_ipfw(d, pcwidth, bcwidth); 2165 } 2166 } 2167 } 2168 2169 ac = 0; 2170 2171 done: 2172 free(data); 2173 2174 if (exitval != EX_OK) 2175 exit(exitval); 2176 #undef NEXT 2177 } 2178 2179 static int 2180 lookup_host (char *host, struct in_addr *ipaddr) 2181 { 2182 struct hostent *he; 2183 2184 if (!inet_aton(host, ipaddr)) { 2185 if ((he = gethostbyname(host)) == NULL) 2186 return(-1); 2187 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 2188 } 2189 return(0); 2190 } 2191 2192 /* 2193 * fills the addr and mask fields in the instruction as appropriate from av. 2194 * Update length as appropriate. 2195 * The following formats are allowed: 2196 * me returns O_IP_*_ME 2197 * 1.2.3.4 single IP address 2198 * 1.2.3.4:5.6.7.8 address:mask 2199 * 1.2.3.4/24 address/mask 2200 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 2201 * We can have multiple comma-separated address/mask entries. 2202 */ 2203 static void 2204 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen) 2205 { 2206 int len = 0; 2207 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2208 uint32_t tables_max; 2209 2210 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 2211 2212 if (_substrcmp(av, "any") == 0) 2213 return; 2214 2215 if (_substrcmp(av, "me") == 0) { 2216 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2217 return; 2218 } 2219 2220 if (strncmp(av, "table(", 6) == 0) { 2221 char *p = strchr(av + 6, ','); 2222 2223 if (p) 2224 *p++ = '\0'; 2225 cmd->o.opcode = O_IP_DST_LOOKUP; 2226 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 2227 tables_max = ipfw_get_tables_max(); 2228 if (cmd->o.arg1 > tables_max) 2229 errx(EX_USAGE, "The table number exceeds the maximum " 2230 "allowed value (%u)", tables_max - 1); 2231 if (p) { 2232 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2233 d[0] = strtoul(p, NULL, 0); 2234 } else 2235 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2236 return; 2237 } 2238 2239 while (av) { 2240 /* 2241 * After the address we can have '/' or ':' indicating a mask, 2242 * ',' indicating another address follows, '{' indicating a 2243 * set of addresses of unspecified size. 2244 */ 2245 char *t = NULL, *p = strpbrk(av, "/:,{"); 2246 int masklen; 2247 char md, nd = '\0'; 2248 2249 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len); 2250 2251 if (p) { 2252 md = *p; 2253 *p++ = '\0'; 2254 if ((t = strpbrk(p, ",{")) != NULL) { 2255 nd = *t; 2256 *t = '\0'; 2257 } 2258 } else 2259 md = '\0'; 2260 2261 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2262 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2263 switch (md) { 2264 case ':': 2265 if (!inet_aton(p, (struct in_addr *)&d[1])) 2266 errx(EX_DATAERR, "bad netmask ``%s''", p); 2267 break; 2268 case '/': 2269 masklen = atoi(p); 2270 if (masklen == 0) 2271 d[1] = htonl(0); /* mask */ 2272 else if (masklen > 32) 2273 errx(EX_DATAERR, "bad width ``%s''", p); 2274 else 2275 d[1] = htonl(~0 << (32 - masklen)); 2276 break; 2277 case '{': /* no mask, assume /24 and put back the '{' */ 2278 d[1] = htonl(~0 << (32 - 24)); 2279 *(--p) = md; 2280 break; 2281 2282 case ',': /* single address plus continuation */ 2283 *(--p) = md; 2284 /* FALLTHROUGH */ 2285 case 0: /* initialization value */ 2286 default: 2287 d[1] = htonl(~0); /* force /32 */ 2288 break; 2289 } 2290 d[0] &= d[1]; /* mask base address with mask */ 2291 if (t) 2292 *t = nd; 2293 /* find next separator */ 2294 if (p) 2295 p = strpbrk(p, ",{"); 2296 if (p && *p == '{') { 2297 /* 2298 * We have a set of addresses. They are stored as follows: 2299 * arg1 is the set size (powers of 2, 2..256) 2300 * addr is the base address IN HOST FORMAT 2301 * mask.. is an array of arg1 bits (rounded up to 2302 * the next multiple of 32) with bits set 2303 * for each host in the map. 2304 */ 2305 uint32_t *map = (uint32_t *)&cmd->mask; 2306 int low, high; 2307 int i = contigmask((uint8_t *)&(d[1]), 32); 2308 2309 if (len > 0) 2310 errx(EX_DATAERR, "address set cannot be in a list"); 2311 if (i < 24 || i > 31) 2312 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2313 cmd->o.arg1 = 1<<(32-i); /* map length */ 2314 d[0] = ntohl(d[0]); /* base addr in host format */ 2315 cmd->o.opcode = O_IP_DST_SET; /* default */ 2316 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2317 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2318 map[i] = 0; /* clear map */ 2319 2320 av = p + 1; 2321 low = d[0] & 0xff; 2322 high = low + cmd->o.arg1 - 1; 2323 /* 2324 * Here, i stores the previous value when we specify a range 2325 * of addresses within a mask, e.g. 45-63. i = -1 means we 2326 * have no previous value. 2327 */ 2328 i = -1; /* previous value in a range */ 2329 while (isdigit(*av)) { 2330 char *s; 2331 int a = strtol(av, &s, 0); 2332 2333 if (s == av) { /* no parameter */ 2334 if (*av != '}') 2335 errx(EX_DATAERR, "set not closed\n"); 2336 if (i != -1) 2337 errx(EX_DATAERR, "incomplete range %d-", i); 2338 break; 2339 } 2340 if (a < low || a > high) 2341 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2342 a, low, high); 2343 a -= low; 2344 if (i == -1) /* no previous in range */ 2345 i = a; 2346 else { /* check that range is valid */ 2347 if (i > a) 2348 errx(EX_DATAERR, "invalid range %d-%d", 2349 i+low, a+low); 2350 if (*s == '-') 2351 errx(EX_DATAERR, "double '-' in range"); 2352 } 2353 for (; i <= a; i++) 2354 map[i/32] |= 1<<(i & 31); 2355 i = -1; 2356 if (*s == '-') 2357 i = a; 2358 else if (*s == '}') 2359 break; 2360 av = s+1; 2361 } 2362 return; 2363 } 2364 av = p; 2365 if (av) /* then *av must be a ',' */ 2366 av++; 2367 2368 /* Check this entry */ 2369 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2370 /* 2371 * 'any' turns the entire list into a NOP. 2372 * 'not any' never matches, so it is removed from the 2373 * list unless it is the only item, in which case we 2374 * report an error. 2375 */ 2376 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2377 if (av == NULL && len == 0) /* only this entry */ 2378 errx(EX_DATAERR, "not any never matches"); 2379 } 2380 /* else do nothing and skip this entry */ 2381 return; 2382 } 2383 /* A single IP can be stored in an optimized format */ 2384 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2385 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2386 return; 2387 } 2388 len += 2; /* two words... */ 2389 d += 2; 2390 } /* end while */ 2391 if (len + 1 > F_LEN_MASK) 2392 errx(EX_DATAERR, "address list too long"); 2393 cmd->o.len |= len+1; 2394 } 2395 2396 2397 /* n2mask sets n bits of the mask */ 2398 void 2399 n2mask(struct in6_addr *mask, int n) 2400 { 2401 static int minimask[9] = 2402 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2403 u_char *p; 2404 2405 memset(mask, 0, sizeof(struct in6_addr)); 2406 p = (u_char *) mask; 2407 for (; n > 0; p++, n -= 8) { 2408 if (n >= 8) 2409 *p = 0xff; 2410 else 2411 *p = minimask[n]; 2412 } 2413 return; 2414 } 2415 2416 /* 2417 * helper function to process a set of flags and set bits in the 2418 * appropriate masks. 2419 */ 2420 static void 2421 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2422 struct _s_x *flags, char *p) 2423 { 2424 uint8_t set=0, clear=0; 2425 2426 while (p && *p) { 2427 char *q; /* points to the separator */ 2428 int val; 2429 uint8_t *which; /* mask we are working on */ 2430 2431 if (*p == '!') { 2432 p++; 2433 which = &clear; 2434 } else 2435 which = &set; 2436 q = strchr(p, ','); 2437 if (q) 2438 *q++ = '\0'; 2439 val = match_token(flags, p); 2440 if (val <= 0) 2441 errx(EX_DATAERR, "invalid flag %s", p); 2442 *which |= (uint8_t)val; 2443 p = q; 2444 } 2445 cmd->opcode = opcode; 2446 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2447 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2448 } 2449 2450 2451 void 2452 ipfw_delete(char *av[]) 2453 { 2454 uint32_t rulenum; 2455 int i; 2456 int exitval = EX_OK; 2457 int do_set = 0; 2458 2459 av++; 2460 NEED1("missing rule specification"); 2461 if ( *av && _substrcmp(*av, "set") == 0) { 2462 /* Do not allow using the following syntax: 2463 * ipfw set N delete set M 2464 */ 2465 if (co.use_set) 2466 errx(EX_DATAERR, "invalid syntax"); 2467 do_set = 1; /* delete set */ 2468 av++; 2469 } 2470 2471 /* Rule number */ 2472 while (*av && isdigit(**av)) { 2473 i = atoi(*av); av++; 2474 if (co.do_nat) { 2475 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2476 if (exitval) { 2477 exitval = EX_UNAVAILABLE; 2478 warn("rule %u not available", i); 2479 } 2480 } else if (co.do_pipe) { 2481 exitval = ipfw_delete_pipe(co.do_pipe, i); 2482 } else { 2483 if (co.use_set) 2484 rulenum = (i & 0xffff) | (5 << 24) | 2485 ((co.use_set - 1) << 16); 2486 else 2487 rulenum = (i & 0xffff) | (do_set << 24); 2488 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2489 if (i) { 2490 exitval = EX_UNAVAILABLE; 2491 warn("rule %u: setsockopt(IP_FW_DEL)", 2492 rulenum); 2493 } 2494 } 2495 } 2496 if (exitval != EX_OK) 2497 exit(exitval); 2498 } 2499 2500 2501 /* 2502 * fill the interface structure. We do not check the name as we can 2503 * create interfaces dynamically, so checking them at insert time 2504 * makes relatively little sense. 2505 * Interface names containing '*', '?', or '[' are assumed to be shell 2506 * patterns which match interfaces. 2507 */ 2508 static void 2509 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen) 2510 { 2511 cmd->name[0] = '\0'; 2512 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2513 2514 CHECK_CMDLEN; 2515 2516 /* Parse the interface or address */ 2517 if (strcmp(arg, "any") == 0) 2518 cmd->o.len = 0; /* effectively ignore this command */ 2519 else if (strncmp(arg, "table(", 6) == 0) { 2520 char *p = strchr(arg + 6, ','); 2521 if (p) 2522 *p++ = '\0'; 2523 cmd->name[0] = '\1'; /* Special value indicating table */ 2524 cmd->p.glob = strtoul(arg + 6, NULL, 0); 2525 } else if (!isdigit(*arg)) { 2526 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2527 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2528 } else if (!inet_aton(arg, &cmd->p.ip)) 2529 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2530 } 2531 2532 static void 2533 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2534 { 2535 int i; 2536 size_t l; 2537 char *ap, *ptr, *optr; 2538 struct ether_addr *mac; 2539 const char *macset = "0123456789abcdefABCDEF:"; 2540 2541 if (strcmp(p, "any") == 0) { 2542 for (i = 0; i < ETHER_ADDR_LEN; i++) 2543 addr[i] = mask[i] = 0; 2544 return; 2545 } 2546 2547 optr = ptr = strdup(p); 2548 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2549 l = strlen(ap); 2550 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2551 errx(EX_DATAERR, "Incorrect MAC address"); 2552 bcopy(mac, addr, ETHER_ADDR_LEN); 2553 } else 2554 errx(EX_DATAERR, "Incorrect MAC address"); 2555 2556 if (ptr != NULL) { /* we have mask? */ 2557 if (p[ptr - optr - 1] == '/') { /* mask len */ 2558 long ml = strtol(ptr, &ap, 10); 2559 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 2560 errx(EX_DATAERR, "Incorrect mask length"); 2561 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 2562 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 2563 } else { /* mask */ 2564 l = strlen(ptr); 2565 if (strspn(ptr, macset) != l || 2566 (mac = ether_aton(ptr)) == NULL) 2567 errx(EX_DATAERR, "Incorrect mask"); 2568 bcopy(mac, mask, ETHER_ADDR_LEN); 2569 } 2570 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2571 for (i = 0; i < ETHER_ADDR_LEN; i++) 2572 mask[i] = 0xff; 2573 } 2574 for (i = 0; i < ETHER_ADDR_LEN; i++) 2575 addr[i] &= mask[i]; 2576 2577 free(optr); 2578 } 2579 2580 /* 2581 * helper function, updates the pointer to cmd with the length 2582 * of the current command, and also cleans up the first word of 2583 * the new command in case it has been clobbered before. 2584 */ 2585 static ipfw_insn * 2586 next_cmd(ipfw_insn *cmd, int *len) 2587 { 2588 *len -= F_LEN(cmd); 2589 CHECK_LENGTH(*len, 0); 2590 cmd += F_LEN(cmd); 2591 bzero(cmd, sizeof(*cmd)); 2592 return cmd; 2593 } 2594 2595 /* 2596 * Takes arguments and copies them into a comment 2597 */ 2598 static void 2599 fill_comment(ipfw_insn *cmd, char **av, int cblen) 2600 { 2601 int i, l; 2602 char *p = (char *)(cmd + 1); 2603 2604 cmd->opcode = O_NOP; 2605 cmd->len = (cmd->len & (F_NOT | F_OR)); 2606 2607 /* Compute length of comment string. */ 2608 for (i = 0, l = 0; av[i] != NULL; i++) 2609 l += strlen(av[i]) + 1; 2610 if (l == 0) 2611 return; 2612 if (l > 84) 2613 errx(EX_DATAERR, 2614 "comment too long (max 80 chars)"); 2615 l = 1 + (l+3)/4; 2616 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2617 CHECK_CMDLEN; 2618 2619 for (i = 0; av[i] != NULL; i++) { 2620 strcpy(p, av[i]); 2621 p += strlen(av[i]); 2622 *p++ = ' '; 2623 } 2624 *(--p) = '\0'; 2625 } 2626 2627 /* 2628 * A function to fill simple commands of size 1. 2629 * Existing flags are preserved. 2630 */ 2631 static void 2632 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2633 { 2634 cmd->opcode = opcode; 2635 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2636 cmd->arg1 = arg; 2637 } 2638 2639 /* 2640 * Fetch and add the MAC address and type, with masks. This generates one or 2641 * two microinstructions, and returns the pointer to the last one. 2642 */ 2643 static ipfw_insn * 2644 add_mac(ipfw_insn *cmd, char *av[], int cblen) 2645 { 2646 ipfw_insn_mac *mac; 2647 2648 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 2649 errx(EX_DATAERR, "MAC dst src"); 2650 2651 cmd->opcode = O_MACADDR2; 2652 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2653 CHECK_CMDLEN; 2654 2655 mac = (ipfw_insn_mac *)cmd; 2656 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2657 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2658 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2659 return cmd; 2660 } 2661 2662 static ipfw_insn * 2663 add_mactype(ipfw_insn *cmd, char *av, int cblen) 2664 { 2665 if (!av) 2666 errx(EX_DATAERR, "missing MAC type"); 2667 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2668 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 2669 cblen); 2670 cmd->opcode = O_MAC_TYPE; 2671 return cmd; 2672 } else 2673 return NULL; 2674 } 2675 2676 static ipfw_insn * 2677 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2678 { 2679 struct protoent *pe; 2680 char *ep; 2681 int proto; 2682 2683 proto = strtol(av, &ep, 10); 2684 if (*ep != '\0' || proto <= 0) { 2685 if ((pe = getprotobyname(av)) == NULL) 2686 return NULL; 2687 proto = pe->p_proto; 2688 } 2689 2690 fill_cmd(cmd, O_PROTO, 0, proto); 2691 *protop = proto; 2692 return cmd; 2693 } 2694 2695 static ipfw_insn * 2696 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2697 { 2698 u_char proto = IPPROTO_IP; 2699 2700 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2701 ; /* do not set O_IP4 nor O_IP6 */ 2702 else if (strcmp(av, "ip4") == 0) 2703 /* explicit "just IPv4" rule */ 2704 fill_cmd(cmd, O_IP4, 0, 0); 2705 else if (strcmp(av, "ip6") == 0) { 2706 /* explicit "just IPv6" rule */ 2707 proto = IPPROTO_IPV6; 2708 fill_cmd(cmd, O_IP6, 0, 0); 2709 } else 2710 return add_proto0(cmd, av, protop); 2711 2712 *protop = proto; 2713 return cmd; 2714 } 2715 2716 static ipfw_insn * 2717 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2718 { 2719 u_char proto = IPPROTO_IP; 2720 2721 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2722 ; /* do not set O_IP4 nor O_IP6 */ 2723 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2724 /* explicit "just IPv4" rule */ 2725 fill_cmd(cmd, O_IP4, 0, 0); 2726 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2727 /* explicit "just IPv6" rule */ 2728 proto = IPPROTO_IPV6; 2729 fill_cmd(cmd, O_IP6, 0, 0); 2730 } else 2731 return add_proto0(cmd, av, protop); 2732 2733 *protop = proto; 2734 return cmd; 2735 } 2736 2737 static ipfw_insn * 2738 add_srcip(ipfw_insn *cmd, char *av, int cblen) 2739 { 2740 fill_ip((ipfw_insn_ip *)cmd, av, cblen); 2741 if (cmd->opcode == O_IP_DST_SET) /* set */ 2742 cmd->opcode = O_IP_SRC_SET; 2743 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2744 cmd->opcode = O_IP_SRC_LOOKUP; 2745 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2746 cmd->opcode = O_IP_SRC_ME; 2747 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2748 cmd->opcode = O_IP_SRC; 2749 else /* addr/mask */ 2750 cmd->opcode = O_IP_SRC_MASK; 2751 return cmd; 2752 } 2753 2754 static ipfw_insn * 2755 add_dstip(ipfw_insn *cmd, char *av, int cblen) 2756 { 2757 fill_ip((ipfw_insn_ip *)cmd, av, cblen); 2758 if (cmd->opcode == O_IP_DST_SET) /* set */ 2759 ; 2760 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2761 ; 2762 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2763 cmd->opcode = O_IP_DST_ME; 2764 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2765 cmd->opcode = O_IP_DST; 2766 else /* addr/mask */ 2767 cmd->opcode = O_IP_DST_MASK; 2768 return cmd; 2769 } 2770 2771 static ipfw_insn * 2772 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 2773 { 2774 /* XXX "any" is trapped before. Perhaps "to" */ 2775 if (_substrcmp(av, "any") == 0) { 2776 return NULL; 2777 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 2778 /* XXX todo: check that we have a protocol with ports */ 2779 cmd->opcode = opcode; 2780 return cmd; 2781 } 2782 return NULL; 2783 } 2784 2785 static ipfw_insn * 2786 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen) 2787 { 2788 struct in6_addr a; 2789 char *host, *ch, buf[INET6_ADDRSTRLEN]; 2790 ipfw_insn *ret = NULL; 2791 int len; 2792 2793 /* Copy first address in set if needed */ 2794 if ((ch = strpbrk(av, "/,")) != NULL) { 2795 len = ch - av; 2796 strlcpy(buf, av, sizeof(buf)); 2797 if (len < sizeof(buf)) 2798 buf[len] = '\0'; 2799 host = buf; 2800 } else 2801 host = av; 2802 2803 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2804 inet_pton(AF_INET6, host, &a) == 1) 2805 ret = add_srcip6(cmd, av, cblen); 2806 /* XXX: should check for IPv4, not !IPv6 */ 2807 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2808 inet_pton(AF_INET6, host, &a) != 1)) 2809 ret = add_srcip(cmd, av, cblen); 2810 if (ret == NULL && strcmp(av, "any") != 0) 2811 ret = cmd; 2812 2813 return ret; 2814 } 2815 2816 static ipfw_insn * 2817 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen) 2818 { 2819 struct in6_addr a; 2820 char *host, *ch, buf[INET6_ADDRSTRLEN]; 2821 ipfw_insn *ret = NULL; 2822 int len; 2823 2824 /* Copy first address in set if needed */ 2825 if ((ch = strpbrk(av, "/,")) != NULL) { 2826 len = ch - av; 2827 strlcpy(buf, av, sizeof(buf)); 2828 if (len < sizeof(buf)) 2829 buf[len] = '\0'; 2830 host = buf; 2831 } else 2832 host = av; 2833 2834 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2835 inet_pton(AF_INET6, host, &a) == 1) 2836 ret = add_dstip6(cmd, av, cblen); 2837 /* XXX: should check for IPv4, not !IPv6 */ 2838 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2839 inet_pton(AF_INET6, host, &a) != 1)) 2840 ret = add_dstip(cmd, av, cblen); 2841 if (ret == NULL && strcmp(av, "any") != 0) 2842 ret = cmd; 2843 2844 return ret; 2845 } 2846 2847 /* 2848 * Parse arguments and assemble the microinstructions which make up a rule. 2849 * Rules are added into the 'rulebuf' and then copied in the correct order 2850 * into the actual rule. 2851 * 2852 * The syntax for a rule starts with the action, followed by 2853 * optional action parameters, and the various match patterns. 2854 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2855 * (generated if the rule includes a keep-state option), then the 2856 * various match patterns, log/altq actions, and the actual action. 2857 * 2858 */ 2859 void 2860 ipfw_add(char *av[]) 2861 { 2862 /* 2863 * rules are added into the 'rulebuf' and then copied in 2864 * the correct order into the actual rule. 2865 * Some things that need to go out of order (prob, action etc.) 2866 * go into actbuf[]. 2867 */ 2868 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2869 int rblen, ablen, cblen; 2870 2871 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2872 ipfw_insn *first_cmd; /* first match pattern */ 2873 2874 struct ip_fw *rule; 2875 2876 /* 2877 * various flags used to record that we entered some fields. 2878 */ 2879 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2880 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2881 size_t len; 2882 2883 int i; 2884 2885 int open_par = 0; /* open parenthesis ( */ 2886 2887 /* proto is here because it is used to fetch ports */ 2888 u_char proto = IPPROTO_IP; /* default protocol */ 2889 2890 double match_prob = 1; /* match probability, default is always match */ 2891 2892 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2893 bzero(cmdbuf, sizeof(cmdbuf)); 2894 bzero(rulebuf, sizeof(rulebuf)); 2895 2896 rule = (struct ip_fw *)rulebuf; 2897 cmd = (ipfw_insn *)cmdbuf; 2898 action = (ipfw_insn *)actbuf; 2899 2900 rblen = sizeof(rulebuf) / sizeof(rulebuf[0]); 2901 rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]); 2902 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 2903 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 2904 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 2905 2906 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 2907 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 2908 2909 av++; 2910 2911 /* [rule N] -- Rule number optional */ 2912 if (av[0] && isdigit(**av)) { 2913 rule->rulenum = atoi(*av); 2914 av++; 2915 } 2916 2917 /* [set N] -- set number (0..RESVD_SET), optional */ 2918 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 2919 int set = strtoul(av[1], NULL, 10); 2920 if (set < 0 || set > RESVD_SET) 2921 errx(EX_DATAERR, "illegal set %s", av[1]); 2922 rule->set = set; 2923 av += 2; 2924 } 2925 2926 /* [prob D] -- match probability, optional */ 2927 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 2928 match_prob = strtod(av[1], NULL); 2929 2930 if (match_prob <= 0 || match_prob > 1) 2931 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2932 av += 2; 2933 } 2934 2935 /* action -- mandatory */ 2936 NEED1("missing action"); 2937 i = match_token(rule_actions, *av); 2938 av++; 2939 action->len = 1; /* default */ 2940 CHECK_ACTLEN; 2941 switch(i) { 2942 case TOK_CHECKSTATE: 2943 have_state = action; 2944 action->opcode = O_CHECK_STATE; 2945 break; 2946 2947 case TOK_ACCEPT: 2948 action->opcode = O_ACCEPT; 2949 break; 2950 2951 case TOK_DENY: 2952 action->opcode = O_DENY; 2953 action->arg1 = 0; 2954 break; 2955 2956 case TOK_REJECT: 2957 action->opcode = O_REJECT; 2958 action->arg1 = ICMP_UNREACH_HOST; 2959 break; 2960 2961 case TOK_RESET: 2962 action->opcode = O_REJECT; 2963 action->arg1 = ICMP_REJECT_RST; 2964 break; 2965 2966 case TOK_RESET6: 2967 action->opcode = O_UNREACH6; 2968 action->arg1 = ICMP6_UNREACH_RST; 2969 break; 2970 2971 case TOK_UNREACH: 2972 action->opcode = O_REJECT; 2973 NEED1("missing reject code"); 2974 fill_reject_code(&action->arg1, *av); 2975 av++; 2976 break; 2977 2978 case TOK_UNREACH6: 2979 action->opcode = O_UNREACH6; 2980 NEED1("missing unreach code"); 2981 fill_unreach6_code(&action->arg1, *av); 2982 av++; 2983 break; 2984 2985 case TOK_COUNT: 2986 action->opcode = O_COUNT; 2987 break; 2988 2989 case TOK_NAT: 2990 action->opcode = O_NAT; 2991 action->len = F_INSN_SIZE(ipfw_insn_nat); 2992 CHECK_ACTLEN; 2993 if (_substrcmp(*av, "global") == 0) { 2994 action->arg1 = 0; 2995 av++; 2996 break; 2997 } else 2998 goto chkarg; 2999 3000 case TOK_QUEUE: 3001 action->opcode = O_QUEUE; 3002 goto chkarg; 3003 case TOK_PIPE: 3004 action->opcode = O_PIPE; 3005 goto chkarg; 3006 case TOK_SKIPTO: 3007 action->opcode = O_SKIPTO; 3008 goto chkarg; 3009 case TOK_NETGRAPH: 3010 action->opcode = O_NETGRAPH; 3011 goto chkarg; 3012 case TOK_NGTEE: 3013 action->opcode = O_NGTEE; 3014 goto chkarg; 3015 case TOK_DIVERT: 3016 action->opcode = O_DIVERT; 3017 goto chkarg; 3018 case TOK_TEE: 3019 action->opcode = O_TEE; 3020 goto chkarg; 3021 case TOK_CALL: 3022 action->opcode = O_CALLRETURN; 3023 chkarg: 3024 if (!av[0]) 3025 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 3026 if (isdigit(**av)) { 3027 action->arg1 = strtoul(*av, NULL, 10); 3028 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 3029 errx(EX_DATAERR, "illegal argument for %s", 3030 *(av - 1)); 3031 } else if (_substrcmp(*av, "tablearg") == 0) { 3032 action->arg1 = IP_FW_TABLEARG; 3033 } else if (i == TOK_DIVERT || i == TOK_TEE) { 3034 struct servent *s; 3035 setservent(1); 3036 s = getservbyname(av[0], "divert"); 3037 if (s != NULL) 3038 action->arg1 = ntohs(s->s_port); 3039 else 3040 errx(EX_DATAERR, "illegal divert/tee port"); 3041 } else 3042 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 3043 av++; 3044 break; 3045 3046 case TOK_FORWARD: { 3047 /* 3048 * Locate the address-port separator (':' or ','). 3049 * Could be one of the following: 3050 * hostname:port 3051 * IPv4 a.b.c.d,port 3052 * IPv4 a.b.c.d:port 3053 * IPv6 w:x:y::z,port 3054 * The ':' can only be used with hostname and IPv4 address. 3055 * XXX-BZ Should we also support [w:x:y::z]:port? 3056 */ 3057 struct sockaddr_storage result; 3058 struct addrinfo *res; 3059 char *s, *end; 3060 int family; 3061 u_short port_number; 3062 3063 NEED1("missing forward address[:port]"); 3064 3065 /* 3066 * locate the address-port separator (':' or ',') 3067 */ 3068 s = strchr(*av, ','); 3069 if (s == NULL) { 3070 /* Distinguish between IPv4:port and IPv6 cases. */ 3071 s = strchr(*av, ':'); 3072 if (s && strchr(s+1, ':')) 3073 s = NULL; /* no port */ 3074 } 3075 3076 port_number = 0; 3077 if (s != NULL) { 3078 /* Terminate host portion and set s to start of port. */ 3079 *(s++) = '\0'; 3080 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 3081 if (s == end) 3082 errx(EX_DATAERR, 3083 "illegal forwarding port ``%s''", s); 3084 port_number = (u_short)i; 3085 } 3086 3087 if (_substrcmp(*av, "tablearg") == 0) { 3088 family = PF_INET; 3089 ((struct sockaddr_in*)&result)->sin_addr.s_addr = 3090 INADDR_ANY; 3091 } else { 3092 /* 3093 * Resolve the host name or address to a family and a 3094 * network representation of the address. 3095 */ 3096 if (getaddrinfo(*av, NULL, NULL, &res)) 3097 errx(EX_DATAERR, NULL); 3098 /* Just use the first host in the answer. */ 3099 family = res->ai_family; 3100 memcpy(&result, res->ai_addr, res->ai_addrlen); 3101 freeaddrinfo(res); 3102 } 3103 3104 if (family == PF_INET) { 3105 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 3106 3107 action->opcode = O_FORWARD_IP; 3108 action->len = F_INSN_SIZE(ipfw_insn_sa); 3109 CHECK_ACTLEN; 3110 3111 /* 3112 * In the kernel we assume AF_INET and use only 3113 * sin_port and sin_addr. Remember to set sin_len as 3114 * the routing code seems to use it too. 3115 */ 3116 p->sa.sin_len = sizeof(struct sockaddr_in); 3117 p->sa.sin_family = AF_INET; 3118 p->sa.sin_port = port_number; 3119 p->sa.sin_addr.s_addr = 3120 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 3121 } else if (family == PF_INET6) { 3122 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 3123 3124 action->opcode = O_FORWARD_IP6; 3125 action->len = F_INSN_SIZE(ipfw_insn_sa6); 3126 CHECK_ACTLEN; 3127 3128 p->sa.sin6_len = sizeof(struct sockaddr_in6); 3129 p->sa.sin6_family = AF_INET6; 3130 p->sa.sin6_port = port_number; 3131 p->sa.sin6_flowinfo = 0; 3132 p->sa.sin6_scope_id = 0; 3133 /* No table support for v6 yet. */ 3134 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 3135 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 3136 } else { 3137 errx(EX_DATAERR, "Invalid address family in forward action"); 3138 } 3139 av++; 3140 break; 3141 } 3142 case TOK_COMMENT: 3143 /* pretend it is a 'count' rule followed by the comment */ 3144 action->opcode = O_COUNT; 3145 av--; /* go back... */ 3146 break; 3147 3148 case TOK_SETFIB: 3149 { 3150 int numfibs; 3151 size_t intsize = sizeof(int); 3152 3153 action->opcode = O_SETFIB; 3154 NEED1("missing fib number"); 3155 if (_substrcmp(*av, "tablearg") == 0) { 3156 action->arg1 = IP_FW_TABLEARG; 3157 } else { 3158 action->arg1 = strtoul(*av, NULL, 10); 3159 if (sysctlbyname("net.fibs", &numfibs, &intsize, 3160 NULL, 0) == -1) 3161 errx(EX_DATAERR, "fibs not suported.\n"); 3162 if (action->arg1 >= numfibs) /* Temporary */ 3163 errx(EX_DATAERR, "fib too large.\n"); 3164 } 3165 av++; 3166 break; 3167 } 3168 3169 case TOK_SETDSCP: 3170 { 3171 int code; 3172 3173 action->opcode = O_SETDSCP; 3174 NEED1("missing DSCP code"); 3175 if (_substrcmp(*av, "tablearg") == 0) { 3176 action->arg1 = IP_FW_TABLEARG; 3177 } else if (isalpha(*av[0])) { 3178 if ((code = match_token(f_ipdscp, *av)) == -1) 3179 errx(EX_DATAERR, "Unknown DSCP code"); 3180 action->arg1 = code; 3181 } else 3182 action->arg1 = strtoul(*av, NULL, 10); 3183 av++; 3184 break; 3185 } 3186 3187 case TOK_REASS: 3188 action->opcode = O_REASS; 3189 break; 3190 3191 case TOK_RETURN: 3192 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 3193 break; 3194 3195 default: 3196 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 3197 } 3198 action = next_cmd(action, &ablen); 3199 3200 /* 3201 * [altq queuename] -- altq tag, optional 3202 * [log [logamount N]] -- log, optional 3203 * 3204 * If they exist, it go first in the cmdbuf, but then it is 3205 * skipped in the copy section to the end of the buffer. 3206 */ 3207 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 3208 av++; 3209 switch (i) { 3210 case TOK_LOG: 3211 { 3212 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 3213 int l; 3214 3215 if (have_log) 3216 errx(EX_DATAERR, 3217 "log cannot be specified more than once"); 3218 have_log = (ipfw_insn *)c; 3219 cmd->len = F_INSN_SIZE(ipfw_insn_log); 3220 CHECK_CMDLEN; 3221 cmd->opcode = O_LOG; 3222 if (av[0] && _substrcmp(*av, "logamount") == 0) { 3223 av++; 3224 NEED1("logamount requires argument"); 3225 l = atoi(*av); 3226 if (l < 0) 3227 errx(EX_DATAERR, 3228 "logamount must be positive"); 3229 c->max_log = l; 3230 av++; 3231 } else { 3232 len = sizeof(c->max_log); 3233 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 3234 &c->max_log, &len, NULL, 0) == -1) { 3235 if (co.test_only) { 3236 c->max_log = 0; 3237 break; 3238 } 3239 errx(1, "sysctlbyname(\"%s\")", 3240 "net.inet.ip.fw.verbose_limit"); 3241 } 3242 } 3243 } 3244 break; 3245 3246 #ifndef NO_ALTQ 3247 case TOK_ALTQ: 3248 { 3249 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 3250 3251 NEED1("missing altq queue name"); 3252 if (have_altq) 3253 errx(EX_DATAERR, 3254 "altq cannot be specified more than once"); 3255 have_altq = (ipfw_insn *)a; 3256 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 3257 CHECK_CMDLEN; 3258 cmd->opcode = O_ALTQ; 3259 a->qid = altq_name_to_qid(*av); 3260 av++; 3261 } 3262 break; 3263 #endif 3264 3265 case TOK_TAG: 3266 case TOK_UNTAG: { 3267 uint16_t tag; 3268 3269 if (have_tag) 3270 errx(EX_USAGE, "tag and untag cannot be " 3271 "specified more than once"); 3272 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 3273 rule_action_params); 3274 have_tag = cmd; 3275 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 3276 av++; 3277 break; 3278 } 3279 3280 default: 3281 abort(); 3282 } 3283 cmd = next_cmd(cmd, &cblen); 3284 } 3285 3286 if (have_state) /* must be a check-state, we are done */ 3287 goto done; 3288 3289 #define OR_START(target) \ 3290 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 3291 if (open_par) \ 3292 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 3293 prev = NULL; \ 3294 open_par = 1; \ 3295 if ( (av[0])[1] == '\0') { \ 3296 av++; \ 3297 } else \ 3298 (*av)++; \ 3299 } \ 3300 target: \ 3301 3302 3303 #define CLOSE_PAR \ 3304 if (open_par) { \ 3305 if (av[0] && ( \ 3306 strcmp(*av, ")") == 0 || \ 3307 strcmp(*av, "}") == 0)) { \ 3308 prev = NULL; \ 3309 open_par = 0; \ 3310 av++; \ 3311 } else \ 3312 errx(EX_USAGE, "missing \")\"\n"); \ 3313 } 3314 3315 #define NOT_BLOCK \ 3316 if (av[0] && _substrcmp(*av, "not") == 0) { \ 3317 if (cmd->len & F_NOT) \ 3318 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 3319 cmd->len |= F_NOT; \ 3320 av++; \ 3321 } 3322 3323 #define OR_BLOCK(target) \ 3324 if (av[0] && _substrcmp(*av, "or") == 0) { \ 3325 if (prev == NULL || open_par == 0) \ 3326 errx(EX_DATAERR, "invalid OR block"); \ 3327 prev->len |= F_OR; \ 3328 av++; \ 3329 goto target; \ 3330 } \ 3331 CLOSE_PAR; 3332 3333 first_cmd = cmd; 3334 3335 #if 0 3336 /* 3337 * MAC addresses, optional. 3338 * If we have this, we skip the part "proto from src to dst" 3339 * and jump straight to the option parsing. 3340 */ 3341 NOT_BLOCK; 3342 NEED1("missing protocol"); 3343 if (_substrcmp(*av, "MAC") == 0 || 3344 _substrcmp(*av, "mac") == 0) { 3345 av++; /* the "MAC" keyword */ 3346 add_mac(cmd, av); /* exits in case of errors */ 3347 cmd = next_cmd(cmd); 3348 av += 2; /* dst-mac and src-mac */ 3349 NOT_BLOCK; 3350 NEED1("missing mac type"); 3351 if (add_mactype(cmd, av[0])) 3352 cmd = next_cmd(cmd); 3353 av++; /* any or mac-type */ 3354 goto read_options; 3355 } 3356 #endif 3357 3358 /* 3359 * protocol, mandatory 3360 */ 3361 OR_START(get_proto); 3362 NOT_BLOCK; 3363 NEED1("missing protocol"); 3364 if (add_proto_compat(cmd, *av, &proto)) { 3365 av++; 3366 if (F_LEN(cmd) != 0) { 3367 prev = cmd; 3368 cmd = next_cmd(cmd, &cblen); 3369 } 3370 } else if (first_cmd != cmd) { 3371 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3372 } else 3373 goto read_options; 3374 OR_BLOCK(get_proto); 3375 3376 /* 3377 * "from", mandatory 3378 */ 3379 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3380 errx(EX_USAGE, "missing ``from''"); 3381 av++; 3382 3383 /* 3384 * source IP, mandatory 3385 */ 3386 OR_START(source_ip); 3387 NOT_BLOCK; /* optional "not" */ 3388 NEED1("missing source address"); 3389 if (add_src(cmd, *av, proto, cblen)) { 3390 av++; 3391 if (F_LEN(cmd) != 0) { /* ! any */ 3392 prev = cmd; 3393 cmd = next_cmd(cmd, &cblen); 3394 } 3395 } else 3396 errx(EX_USAGE, "bad source address %s", *av); 3397 OR_BLOCK(source_ip); 3398 3399 /* 3400 * source ports, optional 3401 */ 3402 NOT_BLOCK; /* optional "not" */ 3403 if ( av[0] != NULL ) { 3404 if (_substrcmp(*av, "any") == 0 || 3405 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 3406 av++; 3407 if (F_LEN(cmd) != 0) 3408 cmd = next_cmd(cmd, &cblen); 3409 } 3410 } 3411 3412 /* 3413 * "to", mandatory 3414 */ 3415 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 3416 errx(EX_USAGE, "missing ``to''"); 3417 av++; 3418 3419 /* 3420 * destination, mandatory 3421 */ 3422 OR_START(dest_ip); 3423 NOT_BLOCK; /* optional "not" */ 3424 NEED1("missing dst address"); 3425 if (add_dst(cmd, *av, proto, cblen)) { 3426 av++; 3427 if (F_LEN(cmd) != 0) { /* ! any */ 3428 prev = cmd; 3429 cmd = next_cmd(cmd, &cblen); 3430 } 3431 } else 3432 errx( EX_USAGE, "bad destination address %s", *av); 3433 OR_BLOCK(dest_ip); 3434 3435 /* 3436 * dest. ports, optional 3437 */ 3438 NOT_BLOCK; /* optional "not" */ 3439 if (av[0]) { 3440 if (_substrcmp(*av, "any") == 0 || 3441 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 3442 av++; 3443 if (F_LEN(cmd) != 0) 3444 cmd = next_cmd(cmd, &cblen); 3445 } 3446 } 3447 3448 read_options: 3449 if (av[0] && first_cmd == cmd) { 3450 /* 3451 * nothing specified so far, store in the rule to ease 3452 * printout later. 3453 */ 3454 rule->_pad = 1; 3455 } 3456 prev = NULL; 3457 while ( av[0] != NULL ) { 3458 char *s; 3459 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3460 3461 s = *av; 3462 cmd32 = (ipfw_insn_u32 *)cmd; 3463 3464 if (*s == '!') { /* alternate syntax for NOT */ 3465 if (cmd->len & F_NOT) 3466 errx(EX_USAGE, "double \"not\" not allowed\n"); 3467 cmd->len = F_NOT; 3468 s++; 3469 } 3470 i = match_token(rule_options, s); 3471 av++; 3472 switch(i) { 3473 case TOK_NOT: 3474 if (cmd->len & F_NOT) 3475 errx(EX_USAGE, "double \"not\" not allowed\n"); 3476 cmd->len = F_NOT; 3477 break; 3478 3479 case TOK_OR: 3480 if (open_par == 0 || prev == NULL) 3481 errx(EX_USAGE, "invalid \"or\" block\n"); 3482 prev->len |= F_OR; 3483 break; 3484 3485 case TOK_STARTBRACE: 3486 if (open_par) 3487 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3488 open_par = 1; 3489 break; 3490 3491 case TOK_ENDBRACE: 3492 if (!open_par) 3493 errx(EX_USAGE, "+missing \")\"\n"); 3494 open_par = 0; 3495 prev = NULL; 3496 break; 3497 3498 case TOK_IN: 3499 fill_cmd(cmd, O_IN, 0, 0); 3500 break; 3501 3502 case TOK_OUT: 3503 cmd->len ^= F_NOT; /* toggle F_NOT */ 3504 fill_cmd(cmd, O_IN, 0, 0); 3505 break; 3506 3507 case TOK_DIVERTED: 3508 fill_cmd(cmd, O_DIVERTED, 0, 3); 3509 break; 3510 3511 case TOK_DIVERTEDLOOPBACK: 3512 fill_cmd(cmd, O_DIVERTED, 0, 1); 3513 break; 3514 3515 case TOK_DIVERTEDOUTPUT: 3516 fill_cmd(cmd, O_DIVERTED, 0, 2); 3517 break; 3518 3519 case TOK_FRAG: 3520 fill_cmd(cmd, O_FRAG, 0, 0); 3521 break; 3522 3523 case TOK_LAYER2: 3524 fill_cmd(cmd, O_LAYER2, 0, 0); 3525 break; 3526 3527 case TOK_XMIT: 3528 case TOK_RECV: 3529 case TOK_VIA: 3530 NEED1("recv, xmit, via require interface name" 3531 " or address"); 3532 fill_iface((ipfw_insn_if *)cmd, av[0], cblen); 3533 av++; 3534 if (F_LEN(cmd) == 0) /* not a valid address */ 3535 break; 3536 if (i == TOK_XMIT) 3537 cmd->opcode = O_XMIT; 3538 else if (i == TOK_RECV) 3539 cmd->opcode = O_RECV; 3540 else if (i == TOK_VIA) 3541 cmd->opcode = O_VIA; 3542 break; 3543 3544 case TOK_ICMPTYPES: 3545 NEED1("icmptypes requires list of types"); 3546 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3547 av++; 3548 break; 3549 3550 case TOK_ICMP6TYPES: 3551 NEED1("icmptypes requires list of types"); 3552 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 3553 av++; 3554 break; 3555 3556 case TOK_IPTTL: 3557 NEED1("ipttl requires TTL"); 3558 if (strpbrk(*av, "-,")) { 3559 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 3560 errx(EX_DATAERR, "invalid ipttl %s", *av); 3561 } else 3562 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3563 av++; 3564 break; 3565 3566 case TOK_IPID: 3567 NEED1("ipid requires id"); 3568 if (strpbrk(*av, "-,")) { 3569 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 3570 errx(EX_DATAERR, "invalid ipid %s", *av); 3571 } else 3572 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3573 av++; 3574 break; 3575 3576 case TOK_IPLEN: 3577 NEED1("iplen requires length"); 3578 if (strpbrk(*av, "-,")) { 3579 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 3580 errx(EX_DATAERR, "invalid ip len %s", *av); 3581 } else 3582 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3583 av++; 3584 break; 3585 3586 case TOK_IPVER: 3587 NEED1("ipver requires version"); 3588 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3589 av++; 3590 break; 3591 3592 case TOK_IPPRECEDENCE: 3593 NEED1("ipprecedence requires value"); 3594 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3595 (strtoul(*av, NULL, 0) & 7) << 5); 3596 av++; 3597 break; 3598 3599 case TOK_DSCP: 3600 NEED1("missing DSCP code"); 3601 fill_dscp(cmd, *av, cblen); 3602 av++; 3603 break; 3604 3605 case TOK_IPOPTS: 3606 NEED1("missing argument for ipoptions"); 3607 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3608 av++; 3609 break; 3610 3611 case TOK_IPTOS: 3612 NEED1("missing argument for iptos"); 3613 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3614 av++; 3615 break; 3616 3617 case TOK_UID: 3618 NEED1("uid requires argument"); 3619 { 3620 char *end; 3621 uid_t uid; 3622 struct passwd *pwd; 3623 3624 cmd->opcode = O_UID; 3625 uid = strtoul(*av, &end, 0); 3626 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3627 if (pwd == NULL) 3628 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3629 cmd32->d[0] = pwd->pw_uid; 3630 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3631 av++; 3632 } 3633 break; 3634 3635 case TOK_GID: 3636 NEED1("gid requires argument"); 3637 { 3638 char *end; 3639 gid_t gid; 3640 struct group *grp; 3641 3642 cmd->opcode = O_GID; 3643 gid = strtoul(*av, &end, 0); 3644 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3645 if (grp == NULL) 3646 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3647 cmd32->d[0] = grp->gr_gid; 3648 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3649 av++; 3650 } 3651 break; 3652 3653 case TOK_JAIL: 3654 NEED1("jail requires argument"); 3655 { 3656 char *end; 3657 int jid; 3658 3659 cmd->opcode = O_JAIL; 3660 jid = (int)strtol(*av, &end, 0); 3661 if (jid < 0 || *end != '\0') 3662 errx(EX_DATAERR, "jail requires prison ID"); 3663 cmd32->d[0] = (uint32_t)jid; 3664 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3665 av++; 3666 } 3667 break; 3668 3669 case TOK_ESTAB: 3670 fill_cmd(cmd, O_ESTAB, 0, 0); 3671 break; 3672 3673 case TOK_SETUP: 3674 fill_cmd(cmd, O_TCPFLAGS, 0, 3675 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3676 break; 3677 3678 case TOK_TCPDATALEN: 3679 NEED1("tcpdatalen requires length"); 3680 if (strpbrk(*av, "-,")) { 3681 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 3682 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3683 } else 3684 fill_cmd(cmd, O_TCPDATALEN, 0, 3685 strtoul(*av, NULL, 0)); 3686 av++; 3687 break; 3688 3689 case TOK_TCPOPTS: 3690 NEED1("missing argument for tcpoptions"); 3691 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3692 av++; 3693 break; 3694 3695 case TOK_TCPSEQ: 3696 case TOK_TCPACK: 3697 NEED1("tcpseq/tcpack requires argument"); 3698 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3699 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3700 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3701 av++; 3702 break; 3703 3704 case TOK_TCPWIN: 3705 NEED1("tcpwin requires length"); 3706 if (strpbrk(*av, "-,")) { 3707 if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen)) 3708 errx(EX_DATAERR, "invalid tcpwin len %s", *av); 3709 } else 3710 fill_cmd(cmd, O_TCPWIN, 0, 3711 strtoul(*av, NULL, 0)); 3712 av++; 3713 break; 3714 3715 case TOK_TCPFLAGS: 3716 NEED1("missing argument for tcpflags"); 3717 cmd->opcode = O_TCPFLAGS; 3718 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3719 av++; 3720 break; 3721 3722 case TOK_KEEPSTATE: 3723 if (open_par) 3724 errx(EX_USAGE, "keep-state cannot be part " 3725 "of an or block"); 3726 if (have_state) 3727 errx(EX_USAGE, "only one of keep-state " 3728 "and limit is allowed"); 3729 have_state = cmd; 3730 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3731 break; 3732 3733 case TOK_LIMIT: { 3734 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3735 int val; 3736 3737 if (open_par) 3738 errx(EX_USAGE, 3739 "limit cannot be part of an or block"); 3740 if (have_state) 3741 errx(EX_USAGE, "only one of keep-state and " 3742 "limit is allowed"); 3743 have_state = cmd; 3744 3745 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3746 CHECK_CMDLEN; 3747 cmd->opcode = O_LIMIT; 3748 c->limit_mask = c->conn_limit = 0; 3749 3750 while ( av[0] != NULL ) { 3751 if ((val = match_token(limit_masks, *av)) <= 0) 3752 break; 3753 c->limit_mask |= val; 3754 av++; 3755 } 3756 3757 if (c->limit_mask == 0) 3758 errx(EX_USAGE, "limit: missing limit mask"); 3759 3760 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3761 TOK_LIMIT, rule_options); 3762 3763 av++; 3764 break; 3765 } 3766 3767 case TOK_PROTO: 3768 NEED1("missing protocol"); 3769 if (add_proto(cmd, *av, &proto)) { 3770 av++; 3771 } else 3772 errx(EX_DATAERR, "invalid protocol ``%s''", 3773 *av); 3774 break; 3775 3776 case TOK_SRCIP: 3777 NEED1("missing source IP"); 3778 if (add_srcip(cmd, *av, cblen)) { 3779 av++; 3780 } 3781 break; 3782 3783 case TOK_DSTIP: 3784 NEED1("missing destination IP"); 3785 if (add_dstip(cmd, *av, cblen)) { 3786 av++; 3787 } 3788 break; 3789 3790 case TOK_SRCIP6: 3791 NEED1("missing source IP6"); 3792 if (add_srcip6(cmd, *av, cblen)) { 3793 av++; 3794 } 3795 break; 3796 3797 case TOK_DSTIP6: 3798 NEED1("missing destination IP6"); 3799 if (add_dstip6(cmd, *av, cblen)) { 3800 av++; 3801 } 3802 break; 3803 3804 case TOK_SRCPORT: 3805 NEED1("missing source port"); 3806 if (_substrcmp(*av, "any") == 0 || 3807 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 3808 av++; 3809 } else 3810 errx(EX_DATAERR, "invalid source port %s", *av); 3811 break; 3812 3813 case TOK_DSTPORT: 3814 NEED1("missing destination port"); 3815 if (_substrcmp(*av, "any") == 0 || 3816 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 3817 av++; 3818 } else 3819 errx(EX_DATAERR, "invalid destination port %s", 3820 *av); 3821 break; 3822 3823 case TOK_MAC: 3824 if (add_mac(cmd, av, cblen)) 3825 av += 2; 3826 break; 3827 3828 case TOK_MACTYPE: 3829 NEED1("missing mac type"); 3830 if (!add_mactype(cmd, *av, cblen)) 3831 errx(EX_DATAERR, "invalid mac type %s", *av); 3832 av++; 3833 break; 3834 3835 case TOK_VERREVPATH: 3836 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3837 break; 3838 3839 case TOK_VERSRCREACH: 3840 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3841 break; 3842 3843 case TOK_ANTISPOOF: 3844 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3845 break; 3846 3847 case TOK_IPSEC: 3848 fill_cmd(cmd, O_IPSEC, 0, 0); 3849 break; 3850 3851 case TOK_IPV6: 3852 fill_cmd(cmd, O_IP6, 0, 0); 3853 break; 3854 3855 case TOK_IPV4: 3856 fill_cmd(cmd, O_IP4, 0, 0); 3857 break; 3858 3859 case TOK_EXT6HDR: 3860 fill_ext6hdr( cmd, *av ); 3861 av++; 3862 break; 3863 3864 case TOK_FLOWID: 3865 if (proto != IPPROTO_IPV6 ) 3866 errx( EX_USAGE, "flow-id filter is active " 3867 "only for ipv6 protocol\n"); 3868 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 3869 av++; 3870 break; 3871 3872 case TOK_COMMENT: 3873 fill_comment(cmd, av, cblen); 3874 av[0]=NULL; 3875 break; 3876 3877 case TOK_TAGGED: 3878 if (av[0] && strpbrk(*av, "-,")) { 3879 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 3880 errx(EX_DATAERR, "tagged: invalid tag" 3881 " list: %s", *av); 3882 } 3883 else { 3884 uint16_t tag; 3885 3886 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3887 TOK_TAGGED, rule_options); 3888 fill_cmd(cmd, O_TAGGED, 0, tag); 3889 } 3890 av++; 3891 break; 3892 3893 case TOK_FIB: 3894 NEED1("fib requires fib number"); 3895 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3896 av++; 3897 break; 3898 case TOK_SOCKARG: 3899 fill_cmd(cmd, O_SOCKARG, 0, 0); 3900 break; 3901 3902 case TOK_LOOKUP: { 3903 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 3904 char *p; 3905 int j; 3906 3907 if (!av[0] || !av[1]) 3908 errx(EX_USAGE, "format: lookup argument tablenum"); 3909 cmd->opcode = O_IP_DST_LOOKUP; 3910 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 3911 i = match_token(rule_options, *av); 3912 for (j = 0; lookup_key[j] >= 0 ; j++) { 3913 if (i == lookup_key[j]) 3914 break; 3915 } 3916 if (lookup_key[j] <= 0) 3917 errx(EX_USAGE, "format: cannot lookup on %s", *av); 3918 __PAST_END(c->d, 1) = j; // i converted to option 3919 av++; 3920 cmd->arg1 = strtoul(*av, &p, 0); 3921 if (p && *p) 3922 errx(EX_USAGE, "format: lookup argument tablenum"); 3923 av++; 3924 } 3925 break; 3926 3927 default: 3928 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3929 } 3930 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3931 prev = cmd; 3932 cmd = next_cmd(cmd, &cblen); 3933 } 3934 } 3935 3936 done: 3937 /* 3938 * Now copy stuff into the rule. 3939 * If we have a keep-state option, the first instruction 3940 * must be a PROBE_STATE (which is generated here). 3941 * If we have a LOG option, it was stored as the first command, 3942 * and now must be moved to the top of the action part. 3943 */ 3944 dst = (ipfw_insn *)rule->cmd; 3945 3946 /* 3947 * First thing to write into the command stream is the match probability. 3948 */ 3949 if (match_prob != 1) { /* 1 means always match */ 3950 dst->opcode = O_PROB; 3951 dst->len = 2; 3952 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3953 dst += dst->len; 3954 } 3955 3956 /* 3957 * generate O_PROBE_STATE if necessary 3958 */ 3959 if (have_state && have_state->opcode != O_CHECK_STATE) { 3960 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3961 dst = next_cmd(dst, &rblen); 3962 } 3963 3964 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3965 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3966 i = F_LEN(src); 3967 CHECK_RBUFLEN(i); 3968 3969 switch (src->opcode) { 3970 case O_LOG: 3971 case O_KEEP_STATE: 3972 case O_LIMIT: 3973 case O_ALTQ: 3974 case O_TAG: 3975 break; 3976 default: 3977 bcopy(src, dst, i * sizeof(uint32_t)); 3978 dst += i; 3979 } 3980 } 3981 3982 /* 3983 * put back the have_state command as last opcode 3984 */ 3985 if (have_state && have_state->opcode != O_CHECK_STATE) { 3986 i = F_LEN(have_state); 3987 CHECK_RBUFLEN(i); 3988 bcopy(have_state, dst, i * sizeof(uint32_t)); 3989 dst += i; 3990 } 3991 /* 3992 * start action section 3993 */ 3994 rule->act_ofs = dst - rule->cmd; 3995 3996 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3997 if (have_log) { 3998 i = F_LEN(have_log); 3999 CHECK_RBUFLEN(i); 4000 bcopy(have_log, dst, i * sizeof(uint32_t)); 4001 dst += i; 4002 } 4003 if (have_altq) { 4004 i = F_LEN(have_altq); 4005 CHECK_RBUFLEN(i); 4006 bcopy(have_altq, dst, i * sizeof(uint32_t)); 4007 dst += i; 4008 } 4009 if (have_tag) { 4010 i = F_LEN(have_tag); 4011 CHECK_RBUFLEN(i); 4012 bcopy(have_tag, dst, i * sizeof(uint32_t)); 4013 dst += i; 4014 } 4015 4016 /* 4017 * copy all other actions 4018 */ 4019 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 4020 i = F_LEN(src); 4021 CHECK_RBUFLEN(i); 4022 bcopy(src, dst, i * sizeof(uint32_t)); 4023 dst += i; 4024 } 4025 4026 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 4027 i = (char *)dst - (char *)rule; 4028 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 4029 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 4030 if (!co.do_quiet) 4031 show_ipfw(rule, 0, 0); 4032 } 4033 4034 /* 4035 * clear the counters or the log counters. 4036 */ 4037 void 4038 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 4039 { 4040 uint32_t arg, saved_arg; 4041 int failed = EX_OK; 4042 char const *errstr; 4043 char const *name = optname ? "RESETLOG" : "ZERO"; 4044 4045 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 4046 4047 av++; ac--; 4048 4049 if (!ac) { 4050 /* clear all entries */ 4051 if (do_cmd(optname, NULL, 0) < 0) 4052 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 4053 if (!co.do_quiet) 4054 printf("%s.\n", optname == IP_FW_ZERO ? 4055 "Accounting cleared":"Logging counts reset"); 4056 4057 return; 4058 } 4059 4060 while (ac) { 4061 /* Rule number */ 4062 if (isdigit(**av)) { 4063 arg = strtonum(*av, 0, 0xffff, &errstr); 4064 if (errstr) 4065 errx(EX_DATAERR, 4066 "invalid rule number %s\n", *av); 4067 saved_arg = arg; 4068 if (co.use_set) 4069 arg |= (1 << 24) | ((co.use_set - 1) << 16); 4070 av++; 4071 ac--; 4072 if (do_cmd(optname, &arg, sizeof(arg))) { 4073 warn("rule %u: setsockopt(IP_FW_%s)", 4074 saved_arg, name); 4075 failed = EX_UNAVAILABLE; 4076 } else if (!co.do_quiet) 4077 printf("Entry %d %s.\n", saved_arg, 4078 optname == IP_FW_ZERO ? 4079 "cleared" : "logging count reset"); 4080 } else { 4081 errx(EX_USAGE, "invalid rule number ``%s''", *av); 4082 } 4083 } 4084 if (failed != EX_OK) 4085 exit(failed); 4086 } 4087 4088 void 4089 ipfw_flush(int force) 4090 { 4091 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 4092 4093 if (!force && !co.do_quiet) { /* need to ask user */ 4094 int c; 4095 4096 printf("Are you sure? [yn] "); 4097 fflush(stdout); 4098 do { 4099 c = toupper(getc(stdin)); 4100 while (c != '\n' && getc(stdin) != '\n') 4101 if (feof(stdin)) 4102 return; /* and do not flush */ 4103 } while (c != 'Y' && c != 'N'); 4104 printf("\n"); 4105 if (c == 'N') /* user said no */ 4106 return; 4107 } 4108 if (co.do_pipe) { 4109 dummynet_flush(); 4110 return; 4111 } 4112 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 4113 if (co.use_set) { 4114 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 4115 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 4116 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 4117 } else if (do_cmd(cmd, NULL, 0) < 0) 4118 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 4119 co.do_pipe ? "DUMMYNET" : "FW"); 4120 if (!co.do_quiet) 4121 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 4122 } 4123 4124 4125 static void table_list(uint16_t num, int need_header); 4126 static void table_fill_xentry(char *arg, ipfw_table_xentry *xent); 4127 4128 /* 4129 * Retrieve maximum number of tables supported by ipfw(4) module. 4130 */ 4131 uint32_t 4132 ipfw_get_tables_max() 4133 { 4134 size_t len; 4135 uint32_t tables_max; 4136 4137 if (ipfw_tables_max != 0) 4138 return (ipfw_tables_max); 4139 4140 len = sizeof(tables_max); 4141 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 4142 NULL, 0) == -1) { 4143 if (co.test_only) 4144 tables_max = 128; /* Old conservative default */ 4145 else 4146 errx(1, "Can't determine maximum number of ipfw tables." 4147 " Perhaps you forgot to load ipfw module?"); 4148 } 4149 4150 ipfw_tables_max = tables_max; 4151 4152 return (ipfw_tables_max); 4153 } 4154 4155 /* 4156 * This one handles all table-related commands 4157 * ipfw table N add addr[/masklen] [value] 4158 * ipfw table N delete addr[/masklen] 4159 * ipfw table {N | all} flush 4160 * ipfw table {N | all} list 4161 */ 4162 void 4163 ipfw_table_handler(int ac, char *av[]) 4164 { 4165 ipfw_table_xentry xent; 4166 int do_add; 4167 int is_all; 4168 uint32_t a; 4169 uint32_t tables_max; 4170 4171 tables_max = ipfw_get_tables_max(); 4172 4173 memset(&xent, 0, sizeof(xent)); 4174 4175 ac--; av++; 4176 if (ac && isdigit(**av)) { 4177 xent.tbl = atoi(*av); 4178 is_all = 0; 4179 ac--; av++; 4180 } else if (ac && _substrcmp(*av, "all") == 0) { 4181 xent.tbl = 0; 4182 is_all = 1; 4183 ac--; av++; 4184 } else 4185 errx(EX_USAGE, "table number or 'all' keyword required"); 4186 if (xent.tbl >= tables_max) 4187 errx(EX_USAGE, "The table number exceeds the maximum allowed " 4188 "value (%d)", tables_max - 1); 4189 NEED1("table needs command"); 4190 if (is_all && _substrcmp(*av, "list") != 0 4191 && _substrcmp(*av, "flush") != 0) 4192 errx(EX_USAGE, "table number required"); 4193 4194 if (_substrcmp(*av, "add") == 0 || 4195 _substrcmp(*av, "delete") == 0) { 4196 do_add = **av == 'a'; 4197 ac--; av++; 4198 if (!ac) 4199 errx(EX_USAGE, "address required"); 4200 4201 table_fill_xentry(*av, &xent); 4202 4203 ac--; av++; 4204 if (do_add && ac) { 4205 unsigned int tval; 4206 /* isdigit is a bit of a hack here.. */ 4207 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 4208 xent.value = strtoul(*av, NULL, 0); 4209 } else { 4210 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 4211 /* The value must be stored in host order * 4212 * so that the values < 65k can be distinguished */ 4213 xent.value = ntohl(tval); 4214 } else { 4215 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 4216 } 4217 } 4218 } else 4219 xent.value = 0; 4220 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL, 4221 &xent, xent.len) < 0) { 4222 /* If running silent, don't bomb out on these errors. */ 4223 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 4224 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 4225 do_add ? "XADD" : "XDEL"); 4226 /* In silent mode, react to a failed add by deleting */ 4227 if (do_add) { 4228 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len); 4229 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0) 4230 err(EX_OSERR, 4231 "setsockopt(IP_FW_TABLE_XADD)"); 4232 } 4233 } 4234 } else if (_substrcmp(*av, "flush") == 0) { 4235 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1); 4236 do { 4237 if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl, 4238 sizeof(xent.tbl)) < 0) 4239 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 4240 } while (++xent.tbl < a); 4241 } else if (_substrcmp(*av, "list") == 0) { 4242 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1); 4243 do { 4244 table_list(xent.tbl, is_all); 4245 } while (++xent.tbl < a); 4246 } else 4247 errx(EX_USAGE, "invalid table command %s", *av); 4248 } 4249 4250 static void 4251 table_fill_xentry(char *arg, ipfw_table_xentry *xent) 4252 { 4253 int addrlen, mask, masklen, type; 4254 struct in6_addr *paddr; 4255 uint32_t *pkey; 4256 char *p; 4257 uint32_t key; 4258 4259 mask = 0; 4260 type = 0; 4261 addrlen = 0; 4262 masklen = 0; 4263 4264 /* 4265 * Let's try to guess type by agrument. 4266 * Possible types: 4267 * 1) IPv4[/mask] 4268 * 2) IPv6[/mask] 4269 * 3) interface name 4270 * 4) port, uid/gid or other u32 key (base 10 format) 4271 * 5) hostname 4272 */ 4273 paddr = &xent->k.addr6; 4274 if (ishexnumber(*arg) != 0 || *arg == ':') { 4275 /* Remove / if exists */ 4276 if ((p = strchr(arg, '/')) != NULL) { 4277 *p = '\0'; 4278 mask = atoi(p + 1); 4279 } 4280 4281 if (inet_pton(AF_INET, arg, paddr) == 1) { 4282 if (p != NULL && mask > 32) 4283 errx(EX_DATAERR, "bad IPv4 mask width: %s", 4284 p + 1); 4285 4286 type = IPFW_TABLE_CIDR; 4287 masklen = p ? mask : 32; 4288 addrlen = sizeof(struct in_addr); 4289 } else if (inet_pton(AF_INET6, arg, paddr) == 1) { 4290 if (IN6_IS_ADDR_V4COMPAT(paddr)) 4291 errx(EX_DATAERR, 4292 "Use IPv4 instead of v4-compatible"); 4293 if (p != NULL && mask > 128) 4294 errx(EX_DATAERR, "bad IPv6 mask width: %s", 4295 p + 1); 4296 4297 type = IPFW_TABLE_CIDR; 4298 masklen = p ? mask : 128; 4299 addrlen = sizeof(struct in6_addr); 4300 } else { 4301 /* Port or any other key */ 4302 /* Skip non-base 10 entries like 'fa1' */ 4303 key = strtol(arg, &p, 10); 4304 if (*p == '\0') { 4305 pkey = (uint32_t *)paddr; 4306 *pkey = htonl(key); 4307 type = IPFW_TABLE_CIDR; 4308 masklen = 32; 4309 addrlen = sizeof(uint32_t); 4310 } else if ((p != arg) && (*p == '.')) { 4311 /* 4312 * Warn on IPv4 address strings 4313 * which are "valid" for inet_aton() but not 4314 * in inet_pton(). 4315 * 4316 * Typical examples: '10.5' or '10.0.0.05' 4317 */ 4318 errx(EX_DATAERR, 4319 "Invalid IPv4 address: %s", arg); 4320 } 4321 } 4322 } 4323 4324 if (type == 0 && strchr(arg, '.') == NULL) { 4325 /* Assume interface name. Copy significant data only */ 4326 mask = MIN(strlen(arg), IF_NAMESIZE - 1); 4327 memcpy(xent->k.iface, arg, mask); 4328 /* Set mask to exact match */ 4329 masklen = 8 * IF_NAMESIZE; 4330 type = IPFW_TABLE_INTERFACE; 4331 addrlen = IF_NAMESIZE; 4332 } 4333 4334 if (type == 0) { 4335 if (lookup_host(arg, (struct in_addr *)paddr) != 0) 4336 errx(EX_NOHOST, "hostname ``%s'' unknown", arg); 4337 4338 masklen = 32; 4339 type = IPFW_TABLE_CIDR; 4340 addrlen = sizeof(struct in_addr); 4341 } 4342 4343 xent->type = type; 4344 xent->masklen = masklen; 4345 xent->len = offsetof(ipfw_table_xentry, k) + addrlen; 4346 } 4347 4348 static void 4349 table_list(uint16_t num, int need_header) 4350 { 4351 ipfw_xtable *tbl; 4352 ipfw_table_xentry *xent; 4353 socklen_t l; 4354 uint32_t *a, sz, tval; 4355 char tbuf[128]; 4356 struct in6_addr *addr6; 4357 ip_fw3_opheader *op3; 4358 4359 /* Prepend value with IP_FW3 header */ 4360 l = sizeof(ip_fw3_opheader) + sizeof(uint32_t); 4361 op3 = alloca(l); 4362 /* Zero reserved fields */ 4363 memset(op3, 0, sizeof(ip_fw3_opheader)); 4364 a = (uint32_t *)(op3 + 1); 4365 *a = num; 4366 op3->opcode = IP_FW_TABLE_XGETSIZE; 4367 if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0) 4368 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)"); 4369 4370 /* If a is zero we have nothing to do, the table is empty. */ 4371 if (*a == 0) 4372 return; 4373 4374 l = *a; 4375 tbl = safe_calloc(1, l); 4376 tbl->opheader.opcode = IP_FW_TABLE_XLIST; 4377 tbl->tbl = num; 4378 if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0) 4379 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)"); 4380 if (tbl->cnt && need_header) 4381 printf("---table(%d)---\n", tbl->tbl); 4382 sz = tbl->size - sizeof(ipfw_xtable); 4383 xent = &tbl->xent[0]; 4384 while (sz > 0) { 4385 switch (tbl->type) { 4386 case IPFW_TABLE_CIDR: 4387 /* IPv4 or IPv6 prefixes */ 4388 tval = xent->value; 4389 addr6 = &xent->k.addr6; 4390 4391 4392 if (IN6_IS_ADDR_V4COMPAT(addr6)) { 4393 /* IPv4 address */ 4394 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf)); 4395 } else { 4396 /* IPv6 address */ 4397 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf)); 4398 } 4399 4400 if (co.do_value_as_ip) { 4401 tval = htonl(tval); 4402 printf("%s/%u %s\n", tbuf, xent->masklen, 4403 inet_ntoa(*(struct in_addr *)&tval)); 4404 } else 4405 printf("%s/%u %u\n", tbuf, xent->masklen, tval); 4406 break; 4407 case IPFW_TABLE_INTERFACE: 4408 /* Interface names */ 4409 tval = xent->value; 4410 if (co.do_value_as_ip) { 4411 tval = htonl(tval); 4412 printf("%s %s\n", xent->k.iface, 4413 inet_ntoa(*(struct in_addr *)&tval)); 4414 } else 4415 printf("%s %u\n", xent->k.iface, tval); 4416 } 4417 4418 if (sz < xent->len) 4419 break; 4420 sz -= xent->len; 4421 xent = (ipfw_table_xentry *)((char *)xent + xent->len); 4422 } 4423 4424 free(tbl); 4425 } 4426