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