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