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