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