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/socket.h> 25 #include <sys/sockio.h> 26 #include <sys/sysctl.h> 27 28 #include "ipfw2.h" 29 30 #include <ctype.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <grp.h> 34 #include <netdb.h> 35 #include <pwd.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <sysexits.h> 40 #include <time.h> /* ctime */ 41 #include <timeconv.h> /* _long_to_time */ 42 #include <unistd.h> 43 #include <fcntl.h> 44 45 #include <net/ethernet.h> 46 #include <net/if.h> /* only IFNAMSIZ */ 47 #include <netinet/in.h> 48 #include <netinet/in_systm.h> /* only n_short, n_long */ 49 #include <netinet/ip.h> 50 #include <netinet/ip_icmp.h> 51 #include <netinet/ip_fw.h> 52 #include <netinet/tcp.h> 53 #include <arpa/inet.h> 54 55 struct cmdline_opts co; /* global options */ 56 57 int resvd_set_number = RESVD_SET; 58 59 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 60 if (!ac) \ 61 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 62 if (_substrcmp(*av, "tablearg") == 0) { \ 63 arg = IP_FW_TABLEARG; \ 64 break; \ 65 } \ 66 \ 67 { \ 68 long val; \ 69 char *end; \ 70 \ 71 val = strtol(*av, &end, 10); \ 72 \ 73 if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \ 74 errx(EX_DATAERR, "%s: invalid argument: %s", \ 75 match_value(s_x, tok), *av); \ 76 \ 77 if (errno == ERANGE || val < min || val > max) \ 78 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 79 match_value(s_x, tok), min, max, *av); \ 80 \ 81 if (val == IP_FW_TABLEARG) \ 82 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 83 match_value(s_x, tok), *av); \ 84 arg = val; \ 85 } \ 86 } while (0) 87 88 static void 89 PRINT_UINT_ARG(const char *str, uint32_t arg) 90 { 91 if (str != NULL) 92 printf("%s",str); 93 if (arg == IP_FW_TABLEARG) 94 printf("tablearg"); 95 else 96 printf("%u", arg); 97 } 98 99 static struct _s_x f_tcpflags[] = { 100 { "syn", TH_SYN }, 101 { "fin", TH_FIN }, 102 { "ack", TH_ACK }, 103 { "psh", TH_PUSH }, 104 { "rst", TH_RST }, 105 { "urg", TH_URG }, 106 { "tcp flag", 0 }, 107 { NULL, 0 } 108 }; 109 110 static struct _s_x f_tcpopts[] = { 111 { "mss", IP_FW_TCPOPT_MSS }, 112 { "maxseg", IP_FW_TCPOPT_MSS }, 113 { "window", IP_FW_TCPOPT_WINDOW }, 114 { "sack", IP_FW_TCPOPT_SACK }, 115 { "ts", IP_FW_TCPOPT_TS }, 116 { "timestamp", IP_FW_TCPOPT_TS }, 117 { "cc", IP_FW_TCPOPT_CC }, 118 { "tcp option", 0 }, 119 { NULL, 0 } 120 }; 121 122 /* 123 * IP options span the range 0 to 255 so we need to remap them 124 * (though in fact only the low 5 bits are significant). 125 */ 126 static struct _s_x f_ipopts[] = { 127 { "ssrr", IP_FW_IPOPT_SSRR}, 128 { "lsrr", IP_FW_IPOPT_LSRR}, 129 { "rr", IP_FW_IPOPT_RR}, 130 { "ts", IP_FW_IPOPT_TS}, 131 { "ip option", 0 }, 132 { NULL, 0 } 133 }; 134 135 static struct _s_x f_iptos[] = { 136 { "lowdelay", IPTOS_LOWDELAY}, 137 { "throughput", IPTOS_THROUGHPUT}, 138 { "reliability", IPTOS_RELIABILITY}, 139 { "mincost", IPTOS_MINCOST}, 140 { "congestion", IPTOS_ECN_CE}, 141 { "ecntransport", IPTOS_ECN_ECT0}, 142 { "ip tos option", 0}, 143 { NULL, 0 } 144 }; 145 146 static struct _s_x limit_masks[] = { 147 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 148 {"src-addr", DYN_SRC_ADDR}, 149 {"src-port", DYN_SRC_PORT}, 150 {"dst-addr", DYN_DST_ADDR}, 151 {"dst-port", DYN_DST_PORT}, 152 {NULL, 0} 153 }; 154 155 /* 156 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 157 * This is only used in this code. 158 */ 159 #define IPPROTO_ETHERTYPE 0x1000 160 static struct _s_x ether_types[] = { 161 /* 162 * Note, we cannot use "-:&/" in the names because they are field 163 * separators in the type specifications. Also, we use s = NULL as 164 * end-delimiter, because a type of 0 can be legal. 165 */ 166 { "ip", 0x0800 }, 167 { "ipv4", 0x0800 }, 168 { "ipv6", 0x86dd }, 169 { "arp", 0x0806 }, 170 { "rarp", 0x8035 }, 171 { "vlan", 0x8100 }, 172 { "loop", 0x9000 }, 173 { "trail", 0x1000 }, 174 { "at", 0x809b }, 175 { "atalk", 0x809b }, 176 { "aarp", 0x80f3 }, 177 { "pppoe_disc", 0x8863 }, 178 { "pppoe_sess", 0x8864 }, 179 { "ipx_8022", 0x00E0 }, 180 { "ipx_8023", 0x0000 }, 181 { "ipx_ii", 0x8137 }, 182 { "ipx_snap", 0x8137 }, 183 { "ipx", 0x8137 }, 184 { "ns", 0x0600 }, 185 { NULL, 0 } 186 }; 187 188 189 static struct _s_x rule_actions[] = { 190 { "accept", TOK_ACCEPT }, 191 { "pass", TOK_ACCEPT }, 192 { "allow", TOK_ACCEPT }, 193 { "permit", TOK_ACCEPT }, 194 { "count", TOK_COUNT }, 195 { "pipe", TOK_PIPE }, 196 { "queue", TOK_QUEUE }, 197 { "divert", TOK_DIVERT }, 198 { "tee", TOK_TEE }, 199 { "netgraph", TOK_NETGRAPH }, 200 { "ngtee", TOK_NGTEE }, 201 { "fwd", TOK_FORWARD }, 202 { "forward", TOK_FORWARD }, 203 { "skipto", TOK_SKIPTO }, 204 { "deny", TOK_DENY }, 205 { "drop", TOK_DENY }, 206 { "reject", TOK_REJECT }, 207 { "reset6", TOK_RESET6 }, 208 { "reset", TOK_RESET }, 209 { "unreach6", TOK_UNREACH6 }, 210 { "unreach", TOK_UNREACH }, 211 { "check-state", TOK_CHECKSTATE }, 212 { "//", TOK_COMMENT }, 213 { "nat", TOK_NAT }, 214 { "setfib", TOK_SETFIB }, 215 { NULL, 0 } /* terminator */ 216 }; 217 218 static struct _s_x rule_action_params[] = { 219 { "altq", TOK_ALTQ }, 220 { "log", TOK_LOG }, 221 { "tag", TOK_TAG }, 222 { "untag", TOK_UNTAG }, 223 { NULL, 0 } /* terminator */ 224 }; 225 226 static struct _s_x rule_options[] = { 227 { "tagged", TOK_TAGGED }, 228 { "uid", TOK_UID }, 229 { "gid", TOK_GID }, 230 { "jail", TOK_JAIL }, 231 { "in", TOK_IN }, 232 { "limit", TOK_LIMIT }, 233 { "keep-state", TOK_KEEPSTATE }, 234 { "bridged", TOK_LAYER2 }, 235 { "layer2", TOK_LAYER2 }, 236 { "out", TOK_OUT }, 237 { "diverted", TOK_DIVERTED }, 238 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 239 { "diverted-output", TOK_DIVERTEDOUTPUT }, 240 { "xmit", TOK_XMIT }, 241 { "recv", TOK_RECV }, 242 { "via", TOK_VIA }, 243 { "fragment", TOK_FRAG }, 244 { "frag", TOK_FRAG }, 245 { "fib", TOK_FIB }, 246 { "ipoptions", TOK_IPOPTS }, 247 { "ipopts", TOK_IPOPTS }, 248 { "iplen", TOK_IPLEN }, 249 { "ipid", TOK_IPID }, 250 { "ipprecedence", TOK_IPPRECEDENCE }, 251 { "iptos", TOK_IPTOS }, 252 { "ipttl", TOK_IPTTL }, 253 { "ipversion", TOK_IPVER }, 254 { "ipver", TOK_IPVER }, 255 { "estab", TOK_ESTAB }, 256 { "established", TOK_ESTAB }, 257 { "setup", TOK_SETUP }, 258 { "tcpdatalen", TOK_TCPDATALEN }, 259 { "tcpflags", TOK_TCPFLAGS }, 260 { "tcpflgs", TOK_TCPFLAGS }, 261 { "tcpoptions", TOK_TCPOPTS }, 262 { "tcpopts", TOK_TCPOPTS }, 263 { "tcpseq", TOK_TCPSEQ }, 264 { "tcpack", TOK_TCPACK }, 265 { "tcpwin", TOK_TCPWIN }, 266 { "icmptype", TOK_ICMPTYPES }, 267 { "icmptypes", TOK_ICMPTYPES }, 268 { "dst-ip", TOK_DSTIP }, 269 { "src-ip", TOK_SRCIP }, 270 { "dst-port", TOK_DSTPORT }, 271 { "src-port", TOK_SRCPORT }, 272 { "proto", TOK_PROTO }, 273 { "MAC", TOK_MAC }, 274 { "mac", TOK_MAC }, 275 { "mac-type", TOK_MACTYPE }, 276 { "verrevpath", TOK_VERREVPATH }, 277 { "versrcreach", TOK_VERSRCREACH }, 278 { "antispoof", TOK_ANTISPOOF }, 279 { "ipsec", TOK_IPSEC }, 280 { "icmp6type", TOK_ICMP6TYPES }, 281 { "icmp6types", TOK_ICMP6TYPES }, 282 { "ext6hdr", TOK_EXT6HDR}, 283 { "flow-id", TOK_FLOWID}, 284 { "ipv6", TOK_IPV6}, 285 { "ip6", TOK_IPV6}, 286 { "ipv4", TOK_IPV4}, 287 { "ip4", TOK_IPV4}, 288 { "dst-ipv6", TOK_DSTIP6}, 289 { "dst-ip6", TOK_DSTIP6}, 290 { "src-ipv6", TOK_SRCIP6}, 291 { "src-ip6", TOK_SRCIP6}, 292 { "//", TOK_COMMENT }, 293 294 { "not", TOK_NOT }, /* pseudo option */ 295 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 296 { "or", TOK_OR }, /* pseudo option */ 297 { "|", /* escape */ TOK_OR }, /* pseudo option */ 298 { "{", TOK_STARTBRACE }, /* pseudo option */ 299 { "(", TOK_STARTBRACE }, /* pseudo option */ 300 { "}", TOK_ENDBRACE }, /* pseudo option */ 301 { ")", TOK_ENDBRACE }, /* pseudo option */ 302 { NULL, 0 } /* terminator */ 303 }; 304 305 /* 306 * The following is used to generate a printable argument for 307 * 64-bit numbers, irrespective of platform alignment and bit size. 308 * Because all the printf in this program use %llu as a format, 309 * we just return an unsigned long long, which is larger than 310 * we need in certain cases, but saves the hassle of using 311 * PRIu64 as a format specifier. 312 * We don't care about inlining, this is not performance critical code. 313 */ 314 unsigned long long 315 align_uint64(const uint64_t *pll) 316 { 317 uint64_t ret; 318 319 bcopy (pll, &ret, sizeof(ret)); 320 return ret; 321 } 322 323 void * 324 safe_calloc(size_t number, size_t size) 325 { 326 void *ret = calloc(number, size); 327 328 if (ret == NULL) 329 err(EX_OSERR, "calloc"); 330 return ret; 331 } 332 333 void * 334 safe_realloc(void *ptr, size_t size) 335 { 336 void *ret = realloc(ptr, size); 337 338 if (ret == NULL) 339 err(EX_OSERR, "realloc"); 340 return ret; 341 } 342 343 /* 344 * conditionally runs the command. 345 */ 346 int 347 do_cmd(int optname, void *optval, uintptr_t optlen) 348 { 349 static int s = -1; /* the socket */ 350 int i; 351 352 if (co.test_only) 353 return 0; 354 355 if (s == -1) 356 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 357 if (s < 0) 358 err(EX_UNAVAILABLE, "socket"); 359 360 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 361 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 362 optname == IP_FW_TABLE_GETSIZE || 363 optname == IP_FW_NAT_GET_CONFIG || 364 optname == IP_FW_NAT_GET_LOG) 365 i = getsockopt(s, IPPROTO_IP, optname, optval, 366 (socklen_t *)optlen); 367 else 368 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 369 return i; 370 } 371 372 /** 373 * match_token takes a table and a string, returns the value associated 374 * with the string (-1 in case of failure). 375 */ 376 int 377 match_token(struct _s_x *table, char *string) 378 { 379 struct _s_x *pt; 380 uint i = strlen(string); 381 382 for (pt = table ; i && pt->s != NULL ; pt++) 383 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 384 return pt->x; 385 return -1; 386 } 387 388 /** 389 * match_value takes a table and a value, returns the string associated 390 * with the value (NULL in case of failure). 391 */ 392 char const * 393 match_value(struct _s_x *p, int value) 394 { 395 for (; p->s != NULL; p++) 396 if (p->x == value) 397 return p->s; 398 return NULL; 399 } 400 401 /* 402 * _substrcmp takes two strings and returns 1 if they do not match, 403 * and 0 if they match exactly or the first string is a sub-string 404 * of the second. A warning is printed to stderr in the case that the 405 * first string is a sub-string of the second. 406 * 407 * This function will be removed in the future through the usual 408 * deprecation process. 409 */ 410 int 411 _substrcmp(const char *str1, const char* str2) 412 { 413 414 if (strncmp(str1, str2, strlen(str1)) != 0) 415 return 1; 416 417 if (strlen(str1) != strlen(str2)) 418 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 419 str1, str2); 420 return 0; 421 } 422 423 /* 424 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 425 * and 0 if they match exactly or the second string is a sub-string 426 * of the first. A warning is printed to stderr in the case that the 427 * first string does not match the third. 428 * 429 * This function exists to warn about the bizzare construction 430 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 431 * for "bytes". The problem is that in addition to accepting "by", 432 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 433 * other string beginning with "by". 434 * 435 * This function will be removed in the future through the usual 436 * deprecation process. 437 */ 438 int 439 _substrcmp2(const char *str1, const char* str2, const char* str3) 440 { 441 442 if (strncmp(str1, str2, strlen(str2)) != 0) 443 return 1; 444 445 if (strcmp(str1, str3) != 0) 446 warnx("DEPRECATED: '%s' matched '%s'", 447 str1, str3); 448 return 0; 449 } 450 451 /* 452 * prints one port, symbolic or numeric 453 */ 454 static void 455 print_port(int proto, uint16_t port) 456 { 457 458 if (proto == IPPROTO_ETHERTYPE) { 459 char const *s; 460 461 if (co.do_resolv && (s = match_value(ether_types, port)) ) 462 printf("%s", s); 463 else 464 printf("0x%04x", port); 465 } else { 466 struct servent *se = NULL; 467 if (co.do_resolv) { 468 struct protoent *pe = getprotobynumber(proto); 469 470 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 471 } 472 if (se) 473 printf("%s", se->s_name); 474 else 475 printf("%d", port); 476 } 477 } 478 479 static struct _s_x _port_name[] = { 480 {"dst-port", O_IP_DSTPORT}, 481 {"src-port", O_IP_SRCPORT}, 482 {"ipid", O_IPID}, 483 {"iplen", O_IPLEN}, 484 {"ipttl", O_IPTTL}, 485 {"mac-type", O_MAC_TYPE}, 486 {"tcpdatalen", O_TCPDATALEN}, 487 {"tagged", O_TAGGED}, 488 {NULL, 0} 489 }; 490 491 /* 492 * Print the values in a list 16-bit items of the types above. 493 * XXX todo: add support for mask. 494 */ 495 static void 496 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 497 { 498 uint16_t *p = cmd->ports; 499 int i; 500 char const *sep; 501 502 if (opcode != 0) { 503 sep = match_value(_port_name, opcode); 504 if (sep == NULL) 505 sep = "???"; 506 printf (" %s", sep); 507 } 508 sep = " "; 509 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 510 printf(sep); 511 print_port(proto, p[0]); 512 if (p[0] != p[1]) { 513 printf("-"); 514 print_port(proto, p[1]); 515 } 516 sep = ","; 517 } 518 } 519 520 /* 521 * Like strtol, but also translates service names into port numbers 522 * for some protocols. 523 * In particular: 524 * proto == -1 disables the protocol check; 525 * proto == IPPROTO_ETHERTYPE looks up an internal table 526 * proto == <some value in /etc/protocols> matches the values there. 527 * Returns *end == s in case the parameter is not found. 528 */ 529 static int 530 strtoport(char *s, char **end, int base, int proto) 531 { 532 char *p, *buf; 533 char *s1; 534 int i; 535 536 *end = s; /* default - not found */ 537 if (*s == '\0') 538 return 0; /* not found */ 539 540 if (isdigit(*s)) 541 return strtol(s, end, base); 542 543 /* 544 * find separator. '\\' escapes the next char. 545 */ 546 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 547 if (*s1 == '\\' && s1[1] != '\0') 548 s1++; 549 550 buf = safe_calloc(s1 - s + 1, 1); 551 552 /* 553 * copy into a buffer skipping backslashes 554 */ 555 for (p = s, i = 0; p != s1 ; p++) 556 if (*p != '\\') 557 buf[i++] = *p; 558 buf[i++] = '\0'; 559 560 if (proto == IPPROTO_ETHERTYPE) { 561 i = match_token(ether_types, buf); 562 free(buf); 563 if (i != -1) { /* found */ 564 *end = s1; 565 return i; 566 } 567 } else { 568 struct protoent *pe = NULL; 569 struct servent *se; 570 571 if (proto != 0) 572 pe = getprotobynumber(proto); 573 setservent(1); 574 se = getservbyname(buf, pe ? pe->p_name : NULL); 575 free(buf); 576 if (se != NULL) { 577 *end = s1; 578 return ntohs(se->s_port); 579 } 580 } 581 return 0; /* not found */ 582 } 583 584 /* 585 * Fill the body of the command with the list of port ranges. 586 */ 587 static int 588 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 589 { 590 uint16_t a, b, *p = cmd->ports; 591 int i = 0; 592 char *s = av; 593 594 while (*s) { 595 a = strtoport(av, &s, 0, proto); 596 if (s == av) /* empty or invalid argument */ 597 return (0); 598 599 switch (*s) { 600 case '-': /* a range */ 601 av = s + 1; 602 b = strtoport(av, &s, 0, proto); 603 /* Reject expressions like '1-abc' or '1-2-3'. */ 604 if (s == av || (*s != ',' && *s != '\0')) 605 return (0); 606 p[0] = a; 607 p[1] = b; 608 break; 609 case ',': /* comma separated list */ 610 case '\0': 611 p[0] = p[1] = a; 612 break; 613 default: 614 warnx("port list: invalid separator <%c> in <%s>", 615 *s, av); 616 return (0); 617 } 618 619 i++; 620 p += 2; 621 av = s + 1; 622 } 623 if (i > 0) { 624 if (i + 1 > F_LEN_MASK) 625 errx(EX_DATAERR, "too many ports/ranges\n"); 626 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 627 } 628 return (i); 629 } 630 631 static struct _s_x icmpcodes[] = { 632 { "net", ICMP_UNREACH_NET }, 633 { "host", ICMP_UNREACH_HOST }, 634 { "protocol", ICMP_UNREACH_PROTOCOL }, 635 { "port", ICMP_UNREACH_PORT }, 636 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 637 { "srcfail", ICMP_UNREACH_SRCFAIL }, 638 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 639 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 640 { "isolated", ICMP_UNREACH_ISOLATED }, 641 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 642 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 643 { "tosnet", ICMP_UNREACH_TOSNET }, 644 { "toshost", ICMP_UNREACH_TOSHOST }, 645 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 646 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 647 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 648 { NULL, 0 } 649 }; 650 651 static void 652 fill_reject_code(u_short *codep, char *str) 653 { 654 int val; 655 char *s; 656 657 val = strtoul(str, &s, 0); 658 if (s == str || *s != '\0' || val >= 0x100) 659 val = match_token(icmpcodes, str); 660 if (val < 0) 661 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 662 *codep = val; 663 return; 664 } 665 666 static void 667 print_reject_code(uint16_t code) 668 { 669 char const *s = match_value(icmpcodes, code); 670 671 if (s != NULL) 672 printf("unreach %s", s); 673 else 674 printf("unreach %u", code); 675 } 676 677 /* 678 * Returns the number of bits set (from left) in a contiguous bitmask, 679 * or -1 if the mask is not contiguous. 680 * XXX this needs a proper fix. 681 * This effectively works on masks in big-endian (network) format. 682 * when compiled on little endian architectures. 683 * 684 * First bit is bit 7 of the first byte -- note, for MAC addresses, 685 * the first bit on the wire is bit 0 of the first byte. 686 * len is the max length in bits. 687 */ 688 int 689 contigmask(uint8_t *p, int len) 690 { 691 int i, n; 692 693 for (i=0; i<len ; i++) 694 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 695 break; 696 for (n=i+1; n < len; n++) 697 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 698 return -1; /* mask not contiguous */ 699 return i; 700 } 701 702 /* 703 * print flags set/clear in the two bitmasks passed as parameters. 704 * There is a specialized check for f_tcpflags. 705 */ 706 static void 707 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 708 { 709 char const *comma = ""; 710 int i; 711 uint8_t set = cmd->arg1 & 0xff; 712 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 713 714 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 715 printf(" setup"); 716 return; 717 } 718 719 printf(" %s ", name); 720 for (i=0; list[i].x != 0; i++) { 721 if (set & list[i].x) { 722 set &= ~list[i].x; 723 printf("%s%s", comma, list[i].s); 724 comma = ","; 725 } 726 if (clear & list[i].x) { 727 clear &= ~list[i].x; 728 printf("%s!%s", comma, list[i].s); 729 comma = ","; 730 } 731 } 732 } 733 734 /* 735 * Print the ip address contained in a command. 736 */ 737 static void 738 print_ip(ipfw_insn_ip *cmd, char const *s) 739 { 740 struct hostent *he = NULL; 741 int len = F_LEN((ipfw_insn *)cmd); 742 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 743 744 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 745 746 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 747 printf("me"); 748 return; 749 } 750 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 751 cmd->o.opcode == O_IP_DST_LOOKUP) { 752 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 753 if (len == F_INSN_SIZE(ipfw_insn_u32)) 754 printf(",%u", *a); 755 printf(")"); 756 return; 757 } 758 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 759 uint32_t x, *map = (uint32_t *)&(cmd->mask); 760 int i, j; 761 char comma = '{'; 762 763 x = cmd->o.arg1 - 1; 764 x = htonl( ~x ); 765 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 766 printf("%s/%d", inet_ntoa(cmd->addr), 767 contigmask((uint8_t *)&x, 32)); 768 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 769 x &= 0xff; /* base */ 770 /* 771 * Print bits and ranges. 772 * Locate first bit set (i), then locate first bit unset (j). 773 * If we have 3+ consecutive bits set, then print them as a 774 * range, otherwise only print the initial bit and rescan. 775 */ 776 for (i=0; i < cmd->o.arg1; i++) 777 if (map[i/32] & (1<<(i & 31))) { 778 for (j=i+1; j < cmd->o.arg1; j++) 779 if (!(map[ j/32] & (1<<(j & 31)))) 780 break; 781 printf("%c%d", comma, i+x); 782 if (j>i+2) { /* range has at least 3 elements */ 783 printf("-%d", j-1+x); 784 i = j-1; 785 } 786 comma = ','; 787 } 788 printf("}"); 789 return; 790 } 791 /* 792 * len == 2 indicates a single IP, whereas lists of 1 or more 793 * addr/mask pairs have len = (2n+1). We convert len to n so we 794 * use that to count the number of entries. 795 */ 796 for (len = len / 2; len > 0; len--, a += 2) { 797 int mb = /* mask length */ 798 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 799 32 : contigmask((uint8_t *)&(a[1]), 32); 800 if (mb == 32 && co.do_resolv) 801 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 802 if (he != NULL) /* resolved to name */ 803 printf("%s", he->h_name); 804 else if (mb == 0) /* any */ 805 printf("any"); 806 else { /* numeric IP followed by some kind of mask */ 807 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 808 if (mb < 0) 809 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 810 else if (mb < 32) 811 printf("/%d", mb); 812 } 813 if (len > 1) 814 printf(","); 815 } 816 } 817 818 /* 819 * prints a MAC address/mask pair 820 */ 821 static void 822 print_mac(uint8_t *addr, uint8_t *mask) 823 { 824 int l = contigmask(mask, 48); 825 826 if (l == 0) 827 printf(" any"); 828 else { 829 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 830 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 831 if (l == -1) 832 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 833 mask[0], mask[1], mask[2], 834 mask[3], mask[4], mask[5]); 835 else if (l < 48) 836 printf("/%d", l); 837 } 838 } 839 840 static void 841 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 842 { 843 uint8_t type; 844 845 cmd->d[0] = 0; 846 while (*av) { 847 if (*av == ',') 848 av++; 849 850 type = strtoul(av, &av, 0); 851 852 if (*av != ',' && *av != '\0') 853 errx(EX_DATAERR, "invalid ICMP type"); 854 855 if (type > 31) 856 errx(EX_DATAERR, "ICMP type out of range"); 857 858 cmd->d[0] |= 1 << type; 859 } 860 cmd->o.opcode = O_ICMPTYPE; 861 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 862 } 863 864 static void 865 print_icmptypes(ipfw_insn_u32 *cmd) 866 { 867 int i; 868 char sep= ' '; 869 870 printf(" icmptypes"); 871 for (i = 0; i < 32; i++) { 872 if ( (cmd->d[0] & (1 << (i))) == 0) 873 continue; 874 printf("%c%d", sep, i); 875 sep = ','; 876 } 877 } 878 879 /* 880 * show_ipfw() prints the body of an ipfw rule. 881 * Because the standard rule has at least proto src_ip dst_ip, we use 882 * a helper function to produce these entries if not provided explicitly. 883 * The first argument is the list of fields we have, the second is 884 * the list of fields we want to be printed. 885 * 886 * Special cases if we have provided a MAC header: 887 * + if the rule does not contain IP addresses/ports, do not print them; 888 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 889 * 890 * Once we have 'have_options', IP header fields are printed as options. 891 */ 892 #define HAVE_PROTO 0x0001 893 #define HAVE_SRCIP 0x0002 894 #define HAVE_DSTIP 0x0004 895 #define HAVE_PROTO4 0x0008 896 #define HAVE_PROTO6 0x0010 897 #define HAVE_OPTIONS 0x8000 898 899 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 900 static void 901 show_prerequisites(int *flags, int want, int cmd __unused) 902 { 903 if (co.comment_only) 904 return; 905 if ( (*flags & HAVE_IP) == HAVE_IP) 906 *flags |= HAVE_OPTIONS; 907 908 if ( !(*flags & HAVE_OPTIONS)) { 909 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 910 if ( (*flags & HAVE_PROTO4)) 911 printf(" ip4"); 912 else if ( (*flags & HAVE_PROTO6)) 913 printf(" ip6"); 914 else 915 printf(" ip"); 916 } 917 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 918 printf(" from any"); 919 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 920 printf(" to any"); 921 } 922 *flags |= want; 923 } 924 925 static void 926 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 927 { 928 static int twidth = 0; 929 int l; 930 ipfw_insn *cmd, *tagptr = NULL; 931 const char *comment = NULL; /* ptr to comment if we have one */ 932 int proto = 0; /* default */ 933 int flags = 0; /* prerequisites */ 934 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 935 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 936 int or_block = 0; /* we are in an or block */ 937 uint32_t set_disable; 938 939 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 940 941 if (set_disable & (1 << rule->set)) { /* disabled */ 942 if (!co.show_sets) 943 return; 944 else 945 printf("# DISABLED "); 946 } 947 printf("%05u ", rule->rulenum); 948 949 if (pcwidth>0 || bcwidth>0) 950 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 951 bcwidth, align_uint64(&rule->bcnt)); 952 953 if (co.do_time == 2) 954 printf("%10u ", rule->timestamp); 955 else if (co.do_time == 1) { 956 char timestr[30]; 957 time_t t = (time_t)0; 958 959 if (twidth == 0) { 960 strcpy(timestr, ctime(&t)); 961 *strchr(timestr, '\n') = '\0'; 962 twidth = strlen(timestr); 963 } 964 if (rule->timestamp) { 965 t = _long_to_time(rule->timestamp); 966 967 strcpy(timestr, ctime(&t)); 968 *strchr(timestr, '\n') = '\0'; 969 printf("%s ", timestr); 970 } else { 971 printf("%*s", twidth, " "); 972 } 973 } 974 975 if (co.show_sets) 976 printf("set %d ", rule->set); 977 978 /* 979 * print the optional "match probability" 980 */ 981 if (rule->cmd_len > 0) { 982 cmd = rule->cmd ; 983 if (cmd->opcode == O_PROB) { 984 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 985 double d = 1.0 * p->d[0]; 986 987 d = (d / 0x7fffffff); 988 printf("prob %f ", d); 989 } 990 } 991 992 /* 993 * first print actions 994 */ 995 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 996 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 997 switch(cmd->opcode) { 998 case O_CHECK_STATE: 999 printf("check-state"); 1000 flags = HAVE_IP; /* avoid printing anything else */ 1001 break; 1002 1003 case O_ACCEPT: 1004 printf("allow"); 1005 break; 1006 1007 case O_COUNT: 1008 printf("count"); 1009 break; 1010 1011 case O_DENY: 1012 printf("deny"); 1013 break; 1014 1015 case O_REJECT: 1016 if (cmd->arg1 == ICMP_REJECT_RST) 1017 printf("reset"); 1018 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1019 printf("reject"); 1020 else 1021 print_reject_code(cmd->arg1); 1022 break; 1023 1024 case O_UNREACH6: 1025 if (cmd->arg1 == ICMP6_UNREACH_RST) 1026 printf("reset6"); 1027 else 1028 print_unreach6_code(cmd->arg1); 1029 break; 1030 1031 case O_SKIPTO: 1032 PRINT_UINT_ARG("skipto ", cmd->arg1); 1033 break; 1034 1035 case O_PIPE: 1036 PRINT_UINT_ARG("pipe ", cmd->arg1); 1037 break; 1038 1039 case O_QUEUE: 1040 PRINT_UINT_ARG("queue ", cmd->arg1); 1041 break; 1042 1043 case O_DIVERT: 1044 PRINT_UINT_ARG("divert ", cmd->arg1); 1045 break; 1046 1047 case O_TEE: 1048 PRINT_UINT_ARG("tee ", cmd->arg1); 1049 break; 1050 1051 case O_NETGRAPH: 1052 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1053 break; 1054 1055 case O_NGTEE: 1056 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1057 break; 1058 1059 case O_FORWARD_IP: 1060 { 1061 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1062 1063 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1064 printf("fwd tablearg"); 1065 } else { 1066 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1067 } 1068 if (s->sa.sin_port) 1069 printf(",%d", s->sa.sin_port); 1070 } 1071 break; 1072 1073 case O_LOG: /* O_LOG is printed last */ 1074 logptr = (ipfw_insn_log *)cmd; 1075 break; 1076 1077 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1078 altqptr = (ipfw_insn_altq *)cmd; 1079 break; 1080 1081 case O_TAG: 1082 tagptr = cmd; 1083 break; 1084 1085 case O_NAT: 1086 PRINT_UINT_ARG("nat ", cmd->arg1); 1087 break; 1088 1089 case O_SETFIB: 1090 PRINT_UINT_ARG("setfib ", cmd->arg1); 1091 break; 1092 1093 default: 1094 printf("** unrecognized action %d len %d ", 1095 cmd->opcode, cmd->len); 1096 } 1097 } 1098 if (logptr) { 1099 if (logptr->max_log > 0) 1100 printf(" log logamount %d", logptr->max_log); 1101 else 1102 printf(" log"); 1103 } 1104 if (altqptr) { 1105 print_altq_cmd(altqptr); 1106 } 1107 if (tagptr) { 1108 if (tagptr->len & F_NOT) 1109 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1110 else 1111 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1112 } 1113 1114 /* 1115 * then print the body. 1116 */ 1117 for (l = rule->act_ofs, cmd = rule->cmd ; 1118 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1119 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1120 continue; 1121 if (cmd->opcode == O_IP4) { 1122 flags |= HAVE_PROTO4; 1123 break; 1124 } else if (cmd->opcode == O_IP6) { 1125 flags |= HAVE_PROTO6; 1126 break; 1127 } 1128 } 1129 if (rule->_pad & 1) { /* empty rules before options */ 1130 if (!co.do_compact) { 1131 show_prerequisites(&flags, HAVE_PROTO, 0); 1132 printf(" from any to any"); 1133 } 1134 flags |= HAVE_IP | HAVE_OPTIONS; 1135 } 1136 1137 if (co.comment_only) 1138 comment = "..."; 1139 1140 for (l = rule->act_ofs, cmd = rule->cmd ; 1141 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1142 /* useful alias */ 1143 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1144 1145 if (co.comment_only) { 1146 if (cmd->opcode != O_NOP) 1147 continue; 1148 printf(" // %s\n", (char *)(cmd + 1)); 1149 return; 1150 } 1151 1152 show_prerequisites(&flags, 0, cmd->opcode); 1153 1154 switch(cmd->opcode) { 1155 case O_PROB: 1156 break; /* done already */ 1157 1158 case O_PROBE_STATE: 1159 break; /* no need to print anything here */ 1160 1161 case O_IP_SRC: 1162 case O_IP_SRC_LOOKUP: 1163 case O_IP_SRC_MASK: 1164 case O_IP_SRC_ME: 1165 case O_IP_SRC_SET: 1166 show_prerequisites(&flags, HAVE_PROTO, 0); 1167 if (!(flags & HAVE_SRCIP)) 1168 printf(" from"); 1169 if ((cmd->len & F_OR) && !or_block) 1170 printf(" {"); 1171 print_ip((ipfw_insn_ip *)cmd, 1172 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1173 flags |= HAVE_SRCIP; 1174 break; 1175 1176 case O_IP_DST: 1177 case O_IP_DST_LOOKUP: 1178 case O_IP_DST_MASK: 1179 case O_IP_DST_ME: 1180 case O_IP_DST_SET: 1181 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1182 if (!(flags & HAVE_DSTIP)) 1183 printf(" to"); 1184 if ((cmd->len & F_OR) && !or_block) 1185 printf(" {"); 1186 print_ip((ipfw_insn_ip *)cmd, 1187 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1188 flags |= HAVE_DSTIP; 1189 break; 1190 1191 case O_IP6_SRC: 1192 case O_IP6_SRC_MASK: 1193 case O_IP6_SRC_ME: 1194 show_prerequisites(&flags, HAVE_PROTO, 0); 1195 if (!(flags & HAVE_SRCIP)) 1196 printf(" from"); 1197 if ((cmd->len & F_OR) && !or_block) 1198 printf(" {"); 1199 print_ip6((ipfw_insn_ip6 *)cmd, 1200 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1201 flags |= HAVE_SRCIP | HAVE_PROTO; 1202 break; 1203 1204 case O_IP6_DST: 1205 case O_IP6_DST_MASK: 1206 case O_IP6_DST_ME: 1207 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1208 if (!(flags & HAVE_DSTIP)) 1209 printf(" to"); 1210 if ((cmd->len & F_OR) && !or_block) 1211 printf(" {"); 1212 print_ip6((ipfw_insn_ip6 *)cmd, 1213 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1214 flags |= HAVE_DSTIP; 1215 break; 1216 1217 case O_FLOW6ID: 1218 print_flow6id( (ipfw_insn_u32 *) cmd ); 1219 flags |= HAVE_OPTIONS; 1220 break; 1221 1222 case O_IP_DSTPORT: 1223 show_prerequisites(&flags, HAVE_IP, 0); 1224 case O_IP_SRCPORT: 1225 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1226 if ((cmd->len & F_OR) && !or_block) 1227 printf(" {"); 1228 if (cmd->len & F_NOT) 1229 printf(" not"); 1230 print_newports((ipfw_insn_u16 *)cmd, proto, 1231 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1232 break; 1233 1234 case O_PROTO: { 1235 struct protoent *pe = NULL; 1236 1237 if ((cmd->len & F_OR) && !or_block) 1238 printf(" {"); 1239 if (cmd->len & F_NOT) 1240 printf(" not"); 1241 proto = cmd->arg1; 1242 pe = getprotobynumber(cmd->arg1); 1243 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1244 !(flags & HAVE_PROTO)) 1245 show_prerequisites(&flags, 1246 HAVE_IP | HAVE_OPTIONS, 0); 1247 if (flags & HAVE_OPTIONS) 1248 printf(" proto"); 1249 if (pe) 1250 printf(" %s", pe->p_name); 1251 else 1252 printf(" %u", cmd->arg1); 1253 } 1254 flags |= HAVE_PROTO; 1255 break; 1256 1257 default: /*options ... */ 1258 if (!(cmd->len & (F_OR|F_NOT))) 1259 if (((cmd->opcode == O_IP6) && 1260 (flags & HAVE_PROTO6)) || 1261 ((cmd->opcode == O_IP4) && 1262 (flags & HAVE_PROTO4))) 1263 break; 1264 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1265 if ((cmd->len & F_OR) && !or_block) 1266 printf(" {"); 1267 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1268 printf(" not"); 1269 switch(cmd->opcode) { 1270 case O_MACADDR2: { 1271 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1272 1273 printf(" MAC"); 1274 print_mac(m->addr, m->mask); 1275 print_mac(m->addr + 6, m->mask + 6); 1276 } 1277 break; 1278 1279 case O_MAC_TYPE: 1280 print_newports((ipfw_insn_u16 *)cmd, 1281 IPPROTO_ETHERTYPE, cmd->opcode); 1282 break; 1283 1284 1285 case O_FRAG: 1286 printf(" frag"); 1287 break; 1288 1289 case O_FIB: 1290 printf(" fib %u", cmd->arg1 ); 1291 break; 1292 1293 case O_IN: 1294 printf(cmd->len & F_NOT ? " out" : " in"); 1295 break; 1296 1297 case O_DIVERTED: 1298 switch (cmd->arg1) { 1299 case 3: 1300 printf(" diverted"); 1301 break; 1302 case 1: 1303 printf(" diverted-loopback"); 1304 break; 1305 case 2: 1306 printf(" diverted-output"); 1307 break; 1308 default: 1309 printf(" diverted-?<%u>", cmd->arg1); 1310 break; 1311 } 1312 break; 1313 1314 case O_LAYER2: 1315 printf(" layer2"); 1316 break; 1317 case O_XMIT: 1318 case O_RECV: 1319 case O_VIA: 1320 { 1321 char const *s; 1322 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1323 1324 if (cmd->opcode == O_XMIT) 1325 s = "xmit"; 1326 else if (cmd->opcode == O_RECV) 1327 s = "recv"; 1328 else /* if (cmd->opcode == O_VIA) */ 1329 s = "via"; 1330 if (cmdif->name[0] == '\0') 1331 printf(" %s %s", s, 1332 inet_ntoa(cmdif->p.ip)); 1333 else 1334 printf(" %s %s", s, cmdif->name); 1335 1336 break; 1337 } 1338 case O_IPID: 1339 if (F_LEN(cmd) == 1) 1340 printf(" ipid %u", cmd->arg1 ); 1341 else 1342 print_newports((ipfw_insn_u16 *)cmd, 0, 1343 O_IPID); 1344 break; 1345 1346 case O_IPTTL: 1347 if (F_LEN(cmd) == 1) 1348 printf(" ipttl %u", cmd->arg1 ); 1349 else 1350 print_newports((ipfw_insn_u16 *)cmd, 0, 1351 O_IPTTL); 1352 break; 1353 1354 case O_IPVER: 1355 printf(" ipver %u", cmd->arg1 ); 1356 break; 1357 1358 case O_IPPRECEDENCE: 1359 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1360 break; 1361 1362 case O_IPLEN: 1363 if (F_LEN(cmd) == 1) 1364 printf(" iplen %u", cmd->arg1 ); 1365 else 1366 print_newports((ipfw_insn_u16 *)cmd, 0, 1367 O_IPLEN); 1368 break; 1369 1370 case O_IPOPT: 1371 print_flags("ipoptions", cmd, f_ipopts); 1372 break; 1373 1374 case O_IPTOS: 1375 print_flags("iptos", cmd, f_iptos); 1376 break; 1377 1378 case O_ICMPTYPE: 1379 print_icmptypes((ipfw_insn_u32 *)cmd); 1380 break; 1381 1382 case O_ESTAB: 1383 printf(" established"); 1384 break; 1385 1386 case O_TCPDATALEN: 1387 if (F_LEN(cmd) == 1) 1388 printf(" tcpdatalen %u", cmd->arg1 ); 1389 else 1390 print_newports((ipfw_insn_u16 *)cmd, 0, 1391 O_TCPDATALEN); 1392 break; 1393 1394 case O_TCPFLAGS: 1395 print_flags("tcpflags", cmd, f_tcpflags); 1396 break; 1397 1398 case O_TCPOPTS: 1399 print_flags("tcpoptions", cmd, f_tcpopts); 1400 break; 1401 1402 case O_TCPWIN: 1403 printf(" tcpwin %d", ntohs(cmd->arg1)); 1404 break; 1405 1406 case O_TCPACK: 1407 printf(" tcpack %d", ntohl(cmd32->d[0])); 1408 break; 1409 1410 case O_TCPSEQ: 1411 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1412 break; 1413 1414 case O_UID: 1415 { 1416 struct passwd *pwd = getpwuid(cmd32->d[0]); 1417 1418 if (pwd) 1419 printf(" uid %s", pwd->pw_name); 1420 else 1421 printf(" uid %u", cmd32->d[0]); 1422 } 1423 break; 1424 1425 case O_GID: 1426 { 1427 struct group *grp = getgrgid(cmd32->d[0]); 1428 1429 if (grp) 1430 printf(" gid %s", grp->gr_name); 1431 else 1432 printf(" gid %u", cmd32->d[0]); 1433 } 1434 break; 1435 1436 case O_JAIL: 1437 printf(" jail %d", cmd32->d[0]); 1438 break; 1439 1440 case O_VERREVPATH: 1441 printf(" verrevpath"); 1442 break; 1443 1444 case O_VERSRCREACH: 1445 printf(" versrcreach"); 1446 break; 1447 1448 case O_ANTISPOOF: 1449 printf(" antispoof"); 1450 break; 1451 1452 case O_IPSEC: 1453 printf(" ipsec"); 1454 break; 1455 1456 case O_NOP: 1457 comment = (char *)(cmd + 1); 1458 break; 1459 1460 case O_KEEP_STATE: 1461 printf(" keep-state"); 1462 break; 1463 1464 case O_LIMIT: { 1465 struct _s_x *p = limit_masks; 1466 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1467 uint8_t x = c->limit_mask; 1468 char const *comma = " "; 1469 1470 printf(" limit"); 1471 for (; p->x != 0 ; p++) 1472 if ((x & p->x) == p->x) { 1473 x &= ~p->x; 1474 printf("%s%s", comma, p->s); 1475 comma = ","; 1476 } 1477 PRINT_UINT_ARG(" ", c->conn_limit); 1478 break; 1479 } 1480 1481 case O_IP6: 1482 printf(" ip6"); 1483 break; 1484 1485 case O_IP4: 1486 printf(" ip4"); 1487 break; 1488 1489 case O_ICMP6TYPE: 1490 print_icmp6types((ipfw_insn_u32 *)cmd); 1491 break; 1492 1493 case O_EXT_HDR: 1494 print_ext6hdr( (ipfw_insn *) cmd ); 1495 break; 1496 1497 case O_TAGGED: 1498 if (F_LEN(cmd) == 1) 1499 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1500 else 1501 print_newports((ipfw_insn_u16 *)cmd, 0, 1502 O_TAGGED); 1503 break; 1504 1505 default: 1506 printf(" [opcode %d len %d]", 1507 cmd->opcode, cmd->len); 1508 } 1509 } 1510 if (cmd->len & F_OR) { 1511 printf(" or"); 1512 or_block = 1; 1513 } else if (or_block) { 1514 printf(" }"); 1515 or_block = 0; 1516 } 1517 } 1518 show_prerequisites(&flags, HAVE_IP, 0); 1519 if (comment) 1520 printf(" // %s", comment); 1521 printf("\n"); 1522 } 1523 1524 static void 1525 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1526 { 1527 struct protoent *pe; 1528 struct in_addr a; 1529 uint16_t rulenum; 1530 char buf[INET6_ADDRSTRLEN]; 1531 1532 if (!co.do_expired) { 1533 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1534 return; 1535 } 1536 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1537 printf("%05d", rulenum); 1538 if (pcwidth>0 || bcwidth>0) 1539 printf(" %*llu %*llu (%ds)", pcwidth, 1540 align_uint64(&d->pcnt), bcwidth, 1541 align_uint64(&d->bcnt), d->expire); 1542 switch (d->dyn_type) { 1543 case O_LIMIT_PARENT: 1544 printf(" PARENT %d", d->count); 1545 break; 1546 case O_LIMIT: 1547 printf(" LIMIT"); 1548 break; 1549 case O_KEEP_STATE: /* bidir, no mask */ 1550 printf(" STATE"); 1551 break; 1552 } 1553 1554 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1555 printf(" %s", pe->p_name); 1556 else 1557 printf(" proto %u", d->id.proto); 1558 1559 if (d->id.addr_type == 4) { 1560 a.s_addr = htonl(d->id.src_ip); 1561 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1562 1563 a.s_addr = htonl(d->id.dst_ip); 1564 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1565 } else if (d->id.addr_type == 6) { 1566 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1567 sizeof(buf)), d->id.src_port); 1568 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1569 sizeof(buf)), d->id.dst_port); 1570 } else 1571 printf(" UNKNOWN <-> UNKNOWN\n"); 1572 1573 printf("\n"); 1574 } 1575 1576 /* 1577 * This one handles all set-related commands 1578 * ipfw set { show | enable | disable } 1579 * ipfw set swap X Y 1580 * ipfw set move X to Y 1581 * ipfw set move rule X to Y 1582 */ 1583 void 1584 ipfw_sets_handler(int ac, char *av[]) 1585 { 1586 uint32_t set_disable, masks[2]; 1587 int i, nbytes; 1588 uint16_t rulenum; 1589 uint8_t cmd, new_set; 1590 1591 ac--; 1592 av++; 1593 1594 if (!ac) 1595 errx(EX_USAGE, "set needs command"); 1596 if (_substrcmp(*av, "show") == 0) { 1597 void *data; 1598 char const *msg; 1599 1600 nbytes = sizeof(struct ip_fw); 1601 data = safe_calloc(1, nbytes); 1602 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1603 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1604 bcopy(&((struct ip_fw *)data)->next_rule, 1605 &set_disable, sizeof(set_disable)); 1606 1607 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1608 if ((set_disable & (1<<i))) { 1609 printf("%s %d", msg, i); 1610 msg = ""; 1611 } 1612 msg = (set_disable) ? " enable" : "enable"; 1613 for (i = 0; i < RESVD_SET; i++) 1614 if (!(set_disable & (1<<i))) { 1615 printf("%s %d", msg, i); 1616 msg = ""; 1617 } 1618 printf("\n"); 1619 } else if (_substrcmp(*av, "swap") == 0) { 1620 ac--; av++; 1621 if (ac != 2) 1622 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1623 rulenum = atoi(av[0]); 1624 new_set = atoi(av[1]); 1625 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1626 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1627 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1628 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1629 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1630 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1631 } else if (_substrcmp(*av, "move") == 0) { 1632 ac--; av++; 1633 if (ac && _substrcmp(*av, "rule") == 0) { 1634 cmd = 2; 1635 ac--; av++; 1636 } else 1637 cmd = 3; 1638 if (ac != 3 || _substrcmp(av[1], "to") != 0) 1639 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1640 rulenum = atoi(av[0]); 1641 new_set = atoi(av[2]); 1642 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1643 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1644 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1645 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1646 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1647 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1648 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1649 } else if (_substrcmp(*av, "disable") == 0 || 1650 _substrcmp(*av, "enable") == 0 ) { 1651 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1652 1653 ac--; av++; 1654 masks[0] = masks[1] = 0; 1655 1656 while (ac) { 1657 if (isdigit(**av)) { 1658 i = atoi(*av); 1659 if (i < 0 || i > RESVD_SET) 1660 errx(EX_DATAERR, 1661 "invalid set number %d\n", i); 1662 masks[which] |= (1<<i); 1663 } else if (_substrcmp(*av, "disable") == 0) 1664 which = 0; 1665 else if (_substrcmp(*av, "enable") == 0) 1666 which = 1; 1667 else 1668 errx(EX_DATAERR, 1669 "invalid set command %s\n", *av); 1670 av++; ac--; 1671 } 1672 if ( (masks[0] & masks[1]) != 0 ) 1673 errx(EX_DATAERR, 1674 "cannot enable and disable the same set\n"); 1675 1676 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1677 if (i) 1678 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1679 } else 1680 errx(EX_USAGE, "invalid set command %s\n", *av); 1681 } 1682 1683 void 1684 ipfw_sysctl_handler(int ac, char *av[], int which) 1685 { 1686 ac--; 1687 av++; 1688 1689 if (ac == 0) { 1690 warnx("missing keyword to enable/disable\n"); 1691 } else if (_substrcmp(*av, "firewall") == 0) { 1692 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1693 &which, sizeof(which)); 1694 } else if (_substrcmp(*av, "one_pass") == 0) { 1695 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1696 &which, sizeof(which)); 1697 } else if (_substrcmp(*av, "debug") == 0) { 1698 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1699 &which, sizeof(which)); 1700 } else if (_substrcmp(*av, "verbose") == 0) { 1701 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1702 &which, sizeof(which)); 1703 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1704 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1705 &which, sizeof(which)); 1706 } else if (_substrcmp(*av, "altq") == 0) { 1707 altq_set_enabled(which); 1708 } else { 1709 warnx("unrecognize enable/disable keyword: %s\n", *av); 1710 } 1711 } 1712 1713 void 1714 ipfw_list(int ac, char *av[], int show_counters) 1715 { 1716 struct ip_fw *r; 1717 ipfw_dyn_rule *dynrules, *d; 1718 1719 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1720 char *lim; 1721 void *data = NULL; 1722 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1723 int exitval = EX_OK; 1724 int lac; 1725 char **lav; 1726 u_long rnum, last; 1727 char *endptr; 1728 int seen = 0; 1729 uint8_t set; 1730 1731 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1732 int nalloc = 1024; /* start somewhere... */ 1733 1734 last = 0; 1735 1736 if (co.test_only) { 1737 fprintf(stderr, "Testing only, list disabled\n"); 1738 return; 1739 } 1740 1741 ac--; 1742 av++; 1743 1744 /* get rules or pipes from kernel, resizing array as necessary */ 1745 nbytes = nalloc; 1746 1747 while (nbytes >= nalloc) { 1748 nalloc = nalloc * 2 + 200; 1749 nbytes = nalloc; 1750 data = safe_realloc(data, nbytes); 1751 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1752 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1753 co.do_pipe ? "DUMMYNET" : "FW"); 1754 } 1755 1756 if (co.do_pipe) { 1757 ipfw_list_pipes(data, nbytes, ac, av); 1758 goto done; 1759 } 1760 1761 /* 1762 * Count static rules. They have variable size so we 1763 * need to scan the list to count them. 1764 */ 1765 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1766 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1767 ++nstat, r = NEXT(r) ) 1768 ; /* nothing */ 1769 1770 /* 1771 * Count dynamic rules. This is easier as they have 1772 * fixed size. 1773 */ 1774 r = NEXT(r); 1775 dynrules = (ipfw_dyn_rule *)r ; 1776 n = (char *)r - (char *)data; 1777 ndyn = (nbytes - n) / sizeof *dynrules; 1778 1779 /* if showing stats, figure out column widths ahead of time */ 1780 bcwidth = pcwidth = 0; 1781 if (show_counters) { 1782 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1783 /* skip rules from another set */ 1784 if (co.use_set && r->set != co.use_set - 1) 1785 continue; 1786 1787 /* packet counter */ 1788 width = snprintf(NULL, 0, "%llu", 1789 align_uint64(&r->pcnt)); 1790 if (width > pcwidth) 1791 pcwidth = width; 1792 1793 /* byte counter */ 1794 width = snprintf(NULL, 0, "%llu", 1795 align_uint64(&r->bcnt)); 1796 if (width > bcwidth) 1797 bcwidth = width; 1798 } 1799 } 1800 if (co.do_dynamic && ndyn) { 1801 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1802 if (co.use_set) { 1803 /* skip rules from another set */ 1804 bcopy((char *)&d->rule + sizeof(uint16_t), 1805 &set, sizeof(uint8_t)); 1806 if (set != co.use_set - 1) 1807 continue; 1808 } 1809 width = snprintf(NULL, 0, "%llu", 1810 align_uint64(&d->pcnt)); 1811 if (width > pcwidth) 1812 pcwidth = width; 1813 1814 width = snprintf(NULL, 0, "%llu", 1815 align_uint64(&d->bcnt)); 1816 if (width > bcwidth) 1817 bcwidth = width; 1818 } 1819 } 1820 /* if no rule numbers were specified, list all rules */ 1821 if (ac == 0) { 1822 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1823 if (co.use_set && r->set != co.use_set - 1) 1824 continue; 1825 show_ipfw(r, pcwidth, bcwidth); 1826 } 1827 1828 if (co.do_dynamic && ndyn) { 1829 printf("## Dynamic rules (%d):\n", ndyn); 1830 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1831 if (co.use_set) { 1832 bcopy((char *)&d->rule + sizeof(uint16_t), 1833 &set, sizeof(uint8_t)); 1834 if (set != co.use_set - 1) 1835 continue; 1836 } 1837 show_dyn_ipfw(d, pcwidth, bcwidth); 1838 } 1839 } 1840 goto done; 1841 } 1842 1843 /* display specific rules requested on command line */ 1844 1845 for (lac = ac, lav = av; lac != 0; lac--) { 1846 /* convert command line rule # */ 1847 last = rnum = strtoul(*lav++, &endptr, 10); 1848 if (*endptr == '-') 1849 last = strtoul(endptr+1, &endptr, 10); 1850 if (*endptr) { 1851 exitval = EX_USAGE; 1852 warnx("invalid rule number: %s", *(lav - 1)); 1853 continue; 1854 } 1855 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1856 if (r->rulenum > last) 1857 break; 1858 if (co.use_set && r->set != co.use_set - 1) 1859 continue; 1860 if (r->rulenum >= rnum && r->rulenum <= last) { 1861 show_ipfw(r, pcwidth, bcwidth); 1862 seen = 1; 1863 } 1864 } 1865 if (!seen) { 1866 /* give precedence to other error(s) */ 1867 if (exitval == EX_OK) 1868 exitval = EX_UNAVAILABLE; 1869 warnx("rule %lu does not exist", rnum); 1870 } 1871 } 1872 1873 if (co.do_dynamic && ndyn) { 1874 printf("## Dynamic rules:\n"); 1875 for (lac = ac, lav = av; lac != 0; lac--) { 1876 last = rnum = strtoul(*lav++, &endptr, 10); 1877 if (*endptr == '-') 1878 last = strtoul(endptr+1, &endptr, 10); 1879 if (*endptr) 1880 /* already warned */ 1881 continue; 1882 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1883 uint16_t rulenum; 1884 1885 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1886 if (rulenum > rnum) 1887 break; 1888 if (co.use_set) { 1889 bcopy((char *)&d->rule + sizeof(uint16_t), 1890 &set, sizeof(uint8_t)); 1891 if (set != co.use_set - 1) 1892 continue; 1893 } 1894 if (r->rulenum >= rnum && r->rulenum <= last) 1895 show_dyn_ipfw(d, pcwidth, bcwidth); 1896 } 1897 } 1898 } 1899 1900 ac = 0; 1901 1902 done: 1903 free(data); 1904 1905 if (exitval != EX_OK) 1906 exit(exitval); 1907 #undef NEXT 1908 } 1909 1910 static int 1911 lookup_host (char *host, struct in_addr *ipaddr) 1912 { 1913 struct hostent *he; 1914 1915 if (!inet_aton(host, ipaddr)) { 1916 if ((he = gethostbyname(host)) == NULL) 1917 return(-1); 1918 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1919 } 1920 return(0); 1921 } 1922 1923 /* 1924 * fills the addr and mask fields in the instruction as appropriate from av. 1925 * Update length as appropriate. 1926 * The following formats are allowed: 1927 * me returns O_IP_*_ME 1928 * 1.2.3.4 single IP address 1929 * 1.2.3.4:5.6.7.8 address:mask 1930 * 1.2.3.4/24 address/mask 1931 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1932 * We can have multiple comma-separated address/mask entries. 1933 */ 1934 static void 1935 fill_ip(ipfw_insn_ip *cmd, char *av) 1936 { 1937 int len = 0; 1938 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1939 1940 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1941 1942 if (_substrcmp(av, "any") == 0) 1943 return; 1944 1945 if (_substrcmp(av, "me") == 0) { 1946 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1947 return; 1948 } 1949 1950 if (strncmp(av, "table(", 6) == 0) { 1951 char *p = strchr(av + 6, ','); 1952 1953 if (p) 1954 *p++ = '\0'; 1955 cmd->o.opcode = O_IP_DST_LOOKUP; 1956 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 1957 if (p) { 1958 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1959 d[0] = strtoul(p, NULL, 0); 1960 } else 1961 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1962 return; 1963 } 1964 1965 while (av) { 1966 /* 1967 * After the address we can have '/' or ':' indicating a mask, 1968 * ',' indicating another address follows, '{' indicating a 1969 * set of addresses of unspecified size. 1970 */ 1971 char *t = NULL, *p = strpbrk(av, "/:,{"); 1972 int masklen; 1973 char md, nd = '\0'; 1974 1975 if (p) { 1976 md = *p; 1977 *p++ = '\0'; 1978 if ((t = strpbrk(p, ",{")) != NULL) { 1979 nd = *t; 1980 *t = '\0'; 1981 } 1982 } else 1983 md = '\0'; 1984 1985 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1986 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1987 switch (md) { 1988 case ':': 1989 if (!inet_aton(p, (struct in_addr *)&d[1])) 1990 errx(EX_DATAERR, "bad netmask ``%s''", p); 1991 break; 1992 case '/': 1993 masklen = atoi(p); 1994 if (masklen == 0) 1995 d[1] = htonl(0); /* mask */ 1996 else if (masklen > 32) 1997 errx(EX_DATAERR, "bad width ``%s''", p); 1998 else 1999 d[1] = htonl(~0 << (32 - masklen)); 2000 break; 2001 case '{': /* no mask, assume /24 and put back the '{' */ 2002 d[1] = htonl(~0 << (32 - 24)); 2003 *(--p) = md; 2004 break; 2005 2006 case ',': /* single address plus continuation */ 2007 *(--p) = md; 2008 /* FALLTHROUGH */ 2009 case 0: /* initialization value */ 2010 default: 2011 d[1] = htonl(~0); /* force /32 */ 2012 break; 2013 } 2014 d[0] &= d[1]; /* mask base address with mask */ 2015 if (t) 2016 *t = nd; 2017 /* find next separator */ 2018 if (p) 2019 p = strpbrk(p, ",{"); 2020 if (p && *p == '{') { 2021 /* 2022 * We have a set of addresses. They are stored as follows: 2023 * arg1 is the set size (powers of 2, 2..256) 2024 * addr is the base address IN HOST FORMAT 2025 * mask.. is an array of arg1 bits (rounded up to 2026 * the next multiple of 32) with bits set 2027 * for each host in the map. 2028 */ 2029 uint32_t *map = (uint32_t *)&cmd->mask; 2030 int low, high; 2031 int i = contigmask((uint8_t *)&(d[1]), 32); 2032 2033 if (len > 0) 2034 errx(EX_DATAERR, "address set cannot be in a list"); 2035 if (i < 24 || i > 31) 2036 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2037 cmd->o.arg1 = 1<<(32-i); /* map length */ 2038 d[0] = ntohl(d[0]); /* base addr in host format */ 2039 cmd->o.opcode = O_IP_DST_SET; /* default */ 2040 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2041 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2042 map[i] = 0; /* clear map */ 2043 2044 av = p + 1; 2045 low = d[0] & 0xff; 2046 high = low + cmd->o.arg1 - 1; 2047 /* 2048 * Here, i stores the previous value when we specify a range 2049 * of addresses within a mask, e.g. 45-63. i = -1 means we 2050 * have no previous value. 2051 */ 2052 i = -1; /* previous value in a range */ 2053 while (isdigit(*av)) { 2054 char *s; 2055 int a = strtol(av, &s, 0); 2056 2057 if (s == av) { /* no parameter */ 2058 if (*av != '}') 2059 errx(EX_DATAERR, "set not closed\n"); 2060 if (i != -1) 2061 errx(EX_DATAERR, "incomplete range %d-", i); 2062 break; 2063 } 2064 if (a < low || a > high) 2065 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2066 a, low, high); 2067 a -= low; 2068 if (i == -1) /* no previous in range */ 2069 i = a; 2070 else { /* check that range is valid */ 2071 if (i > a) 2072 errx(EX_DATAERR, "invalid range %d-%d", 2073 i+low, a+low); 2074 if (*s == '-') 2075 errx(EX_DATAERR, "double '-' in range"); 2076 } 2077 for (; i <= a; i++) 2078 map[i/32] |= 1<<(i & 31); 2079 i = -1; 2080 if (*s == '-') 2081 i = a; 2082 else if (*s == '}') 2083 break; 2084 av = s+1; 2085 } 2086 return; 2087 } 2088 av = p; 2089 if (av) /* then *av must be a ',' */ 2090 av++; 2091 2092 /* Check this entry */ 2093 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2094 /* 2095 * 'any' turns the entire list into a NOP. 2096 * 'not any' never matches, so it is removed from the 2097 * list unless it is the only item, in which case we 2098 * report an error. 2099 */ 2100 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2101 if (av == NULL && len == 0) /* only this entry */ 2102 errx(EX_DATAERR, "not any never matches"); 2103 } 2104 /* else do nothing and skip this entry */ 2105 return; 2106 } 2107 /* A single IP can be stored in an optimized format */ 2108 if (d[1] == ~0 && av == NULL && len == 0) { 2109 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2110 return; 2111 } 2112 len += 2; /* two words... */ 2113 d += 2; 2114 } /* end while */ 2115 if (len + 1 > F_LEN_MASK) 2116 errx(EX_DATAERR, "address list too long"); 2117 cmd->o.len |= len+1; 2118 } 2119 2120 2121 /* n2mask sets n bits of the mask */ 2122 void 2123 n2mask(struct in6_addr *mask, int n) 2124 { 2125 static int minimask[9] = 2126 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2127 u_char *p; 2128 2129 memset(mask, 0, sizeof(struct in6_addr)); 2130 p = (u_char *) mask; 2131 for (; n > 0; p++, n -= 8) { 2132 if (n >= 8) 2133 *p = 0xff; 2134 else 2135 *p = minimask[n]; 2136 } 2137 return; 2138 } 2139 2140 2141 /* 2142 * helper function to process a set of flags and set bits in the 2143 * appropriate masks. 2144 */ 2145 static void 2146 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2147 struct _s_x *flags, char *p) 2148 { 2149 uint8_t set=0, clear=0; 2150 2151 while (p && *p) { 2152 char *q; /* points to the separator */ 2153 int val; 2154 uint8_t *which; /* mask we are working on */ 2155 2156 if (*p == '!') { 2157 p++; 2158 which = &clear; 2159 } else 2160 which = &set; 2161 q = strchr(p, ','); 2162 if (q) 2163 *q++ = '\0'; 2164 val = match_token(flags, p); 2165 if (val <= 0) 2166 errx(EX_DATAERR, "invalid flag %s", p); 2167 *which |= (uint8_t)val; 2168 p = q; 2169 } 2170 cmd->opcode = opcode; 2171 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2172 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2173 } 2174 2175 2176 void 2177 ipfw_delete(int ac, char *av[]) 2178 { 2179 uint32_t rulenum; 2180 int i; 2181 int exitval = EX_OK; 2182 int do_set = 0; 2183 2184 2185 av++; ac--; 2186 NEED1("missing rule specification"); 2187 if (ac > 0 && _substrcmp(*av, "set") == 0) { 2188 /* Do not allow using the following syntax: 2189 * ipfw set N delete set M 2190 */ 2191 if (co.use_set) 2192 errx(EX_DATAERR, "invalid syntax"); 2193 do_set = 1; /* delete set */ 2194 ac--; av++; 2195 } 2196 2197 /* Rule number */ 2198 while (ac && isdigit(**av)) { 2199 i = atoi(*av); av++; ac--; 2200 if (co.do_nat) { 2201 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2202 if (exitval) { 2203 exitval = EX_UNAVAILABLE; 2204 warn("rule %u not available", i); 2205 } 2206 } else if (co.do_pipe) { 2207 exitval = ipfw_delete_pipe(co.do_pipe, i); 2208 } else { 2209 if (co.use_set) 2210 rulenum = (i & 0xffff) | (5 << 24) | 2211 ((co.use_set - 1) << 16); 2212 else 2213 rulenum = (i & 0xffff) | (do_set << 24); 2214 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2215 if (i) { 2216 exitval = EX_UNAVAILABLE; 2217 warn("rule %u: setsockopt(IP_FW_DEL)", 2218 rulenum); 2219 } 2220 } 2221 } 2222 if (exitval != EX_OK) 2223 exit(exitval); 2224 } 2225 2226 2227 /* 2228 * fill the interface structure. We do not check the name as we can 2229 * create interfaces dynamically, so checking them at insert time 2230 * makes relatively little sense. 2231 * Interface names containing '*', '?', or '[' are assumed to be shell 2232 * patterns which match interfaces. 2233 */ 2234 static void 2235 fill_iface(ipfw_insn_if *cmd, char *arg) 2236 { 2237 cmd->name[0] = '\0'; 2238 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2239 2240 /* Parse the interface or address */ 2241 if (strcmp(arg, "any") == 0) 2242 cmd->o.len = 0; /* effectively ignore this command */ 2243 else if (!isdigit(*arg)) { 2244 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2245 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2246 } else if (!inet_aton(arg, &cmd->p.ip)) 2247 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2248 } 2249 2250 static void 2251 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2252 { 2253 int i, l; 2254 char *ap, *ptr, *optr; 2255 struct ether_addr *mac; 2256 const char *macset = "0123456789abcdefABCDEF:"; 2257 2258 if (strcmp(p, "any") == 0) { 2259 for (i = 0; i < ETHER_ADDR_LEN; i++) 2260 addr[i] = mask[i] = 0; 2261 return; 2262 } 2263 2264 optr = ptr = strdup(p); 2265 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2266 l = strlen(ap); 2267 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2268 errx(EX_DATAERR, "Incorrect MAC address"); 2269 bcopy(mac, addr, ETHER_ADDR_LEN); 2270 } else 2271 errx(EX_DATAERR, "Incorrect MAC address"); 2272 2273 if (ptr != NULL) { /* we have mask? */ 2274 if (p[ptr - optr - 1] == '/') { /* mask len */ 2275 l = strtol(ptr, &ap, 10); 2276 if (*ap != 0 || l > ETHER_ADDR_LEN * 8 || l < 0) 2277 errx(EX_DATAERR, "Incorrect mask length"); 2278 for (i = 0; l > 0 && i < ETHER_ADDR_LEN; l -= 8, i++) 2279 mask[i] = (l >= 8) ? 0xff: (~0) << (8 - l); 2280 } else { /* mask */ 2281 l = strlen(ptr); 2282 if (strspn(ptr, macset) != l || 2283 (mac = ether_aton(ptr)) == NULL) 2284 errx(EX_DATAERR, "Incorrect mask"); 2285 bcopy(mac, mask, ETHER_ADDR_LEN); 2286 } 2287 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2288 for (i = 0; i < ETHER_ADDR_LEN; i++) 2289 mask[i] = 0xff; 2290 } 2291 for (i = 0; i < ETHER_ADDR_LEN; i++) 2292 addr[i] &= mask[i]; 2293 2294 free(optr); 2295 } 2296 2297 /* 2298 * helper function, updates the pointer to cmd with the length 2299 * of the current command, and also cleans up the first word of 2300 * the new command in case it has been clobbered before. 2301 */ 2302 static ipfw_insn * 2303 next_cmd(ipfw_insn *cmd) 2304 { 2305 cmd += F_LEN(cmd); 2306 bzero(cmd, sizeof(*cmd)); 2307 return cmd; 2308 } 2309 2310 /* 2311 * Takes arguments and copies them into a comment 2312 */ 2313 static void 2314 fill_comment(ipfw_insn *cmd, int ac, char **av) 2315 { 2316 int i, l; 2317 char *p = (char *)(cmd + 1); 2318 2319 cmd->opcode = O_NOP; 2320 cmd->len = (cmd->len & (F_NOT | F_OR)); 2321 2322 /* Compute length of comment string. */ 2323 for (i = 0, l = 0; i < ac; i++) 2324 l += strlen(av[i]) + 1; 2325 if (l == 0) 2326 return; 2327 if (l > 84) 2328 errx(EX_DATAERR, 2329 "comment too long (max 80 chars)"); 2330 l = 1 + (l+3)/4; 2331 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2332 for (i = 0; i < ac; i++) { 2333 strcpy(p, av[i]); 2334 p += strlen(av[i]); 2335 *p++ = ' '; 2336 } 2337 *(--p) = '\0'; 2338 } 2339 2340 /* 2341 * A function to fill simple commands of size 1. 2342 * Existing flags are preserved. 2343 */ 2344 static void 2345 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2346 { 2347 cmd->opcode = opcode; 2348 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2349 cmd->arg1 = arg; 2350 } 2351 2352 /* 2353 * Fetch and add the MAC address and type, with masks. This generates one or 2354 * two microinstructions, and returns the pointer to the last one. 2355 */ 2356 static ipfw_insn * 2357 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2358 { 2359 ipfw_insn_mac *mac; 2360 2361 if (ac < 2) 2362 errx(EX_DATAERR, "MAC dst src"); 2363 2364 cmd->opcode = O_MACADDR2; 2365 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2366 2367 mac = (ipfw_insn_mac *)cmd; 2368 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2369 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2370 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2371 return cmd; 2372 } 2373 2374 static ipfw_insn * 2375 add_mactype(ipfw_insn *cmd, int ac, char *av) 2376 { 2377 if (ac < 1) 2378 errx(EX_DATAERR, "missing MAC type"); 2379 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2380 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2381 cmd->opcode = O_MAC_TYPE; 2382 return cmd; 2383 } else 2384 return NULL; 2385 } 2386 2387 static ipfw_insn * 2388 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2389 { 2390 struct protoent *pe; 2391 char *ep; 2392 int proto; 2393 2394 proto = strtol(av, &ep, 10); 2395 if (*ep != '\0' || proto <= 0) { 2396 if ((pe = getprotobyname(av)) == NULL) 2397 return NULL; 2398 proto = pe->p_proto; 2399 } 2400 2401 fill_cmd(cmd, O_PROTO, 0, proto); 2402 *protop = proto; 2403 return cmd; 2404 } 2405 2406 static ipfw_insn * 2407 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2408 { 2409 u_char proto = IPPROTO_IP; 2410 2411 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2412 ; /* do not set O_IP4 nor O_IP6 */ 2413 else if (strcmp(av, "ip4") == 0) 2414 /* explicit "just IPv4" rule */ 2415 fill_cmd(cmd, O_IP4, 0, 0); 2416 else if (strcmp(av, "ip6") == 0) { 2417 /* explicit "just IPv6" rule */ 2418 proto = IPPROTO_IPV6; 2419 fill_cmd(cmd, O_IP6, 0, 0); 2420 } else 2421 return add_proto0(cmd, av, protop); 2422 2423 *protop = proto; 2424 return cmd; 2425 } 2426 2427 static ipfw_insn * 2428 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2429 { 2430 u_char proto = IPPROTO_IP; 2431 2432 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2433 ; /* do not set O_IP4 nor O_IP6 */ 2434 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2435 /* explicit "just IPv4" rule */ 2436 fill_cmd(cmd, O_IP4, 0, 0); 2437 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2438 /* explicit "just IPv6" rule */ 2439 proto = IPPROTO_IPV6; 2440 fill_cmd(cmd, O_IP6, 0, 0); 2441 } else 2442 return add_proto0(cmd, av, protop); 2443 2444 *protop = proto; 2445 return cmd; 2446 } 2447 2448 static ipfw_insn * 2449 add_srcip(ipfw_insn *cmd, char *av) 2450 { 2451 fill_ip((ipfw_insn_ip *)cmd, av); 2452 if (cmd->opcode == O_IP_DST_SET) /* set */ 2453 cmd->opcode = O_IP_SRC_SET; 2454 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2455 cmd->opcode = O_IP_SRC_LOOKUP; 2456 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2457 cmd->opcode = O_IP_SRC_ME; 2458 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2459 cmd->opcode = O_IP_SRC; 2460 else /* addr/mask */ 2461 cmd->opcode = O_IP_SRC_MASK; 2462 return cmd; 2463 } 2464 2465 static ipfw_insn * 2466 add_dstip(ipfw_insn *cmd, char *av) 2467 { 2468 fill_ip((ipfw_insn_ip *)cmd, av); 2469 if (cmd->opcode == O_IP_DST_SET) /* set */ 2470 ; 2471 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2472 ; 2473 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2474 cmd->opcode = O_IP_DST_ME; 2475 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2476 cmd->opcode = O_IP_DST; 2477 else /* addr/mask */ 2478 cmd->opcode = O_IP_DST_MASK; 2479 return cmd; 2480 } 2481 2482 static ipfw_insn * 2483 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2484 { 2485 if (_substrcmp(av, "any") == 0) { 2486 return NULL; 2487 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2488 /* XXX todo: check that we have a protocol with ports */ 2489 cmd->opcode = opcode; 2490 return cmd; 2491 } 2492 return NULL; 2493 } 2494 2495 static ipfw_insn * 2496 add_src(ipfw_insn *cmd, char *av, u_char proto) 2497 { 2498 struct in6_addr a; 2499 char *host, *ch; 2500 ipfw_insn *ret = NULL; 2501 2502 if ((host = strdup(av)) == NULL) 2503 return NULL; 2504 if ((ch = strrchr(host, '/')) != NULL) 2505 *ch = '\0'; 2506 2507 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2508 inet_pton(AF_INET6, host, &a)) 2509 ret = add_srcip6(cmd, av); 2510 /* XXX: should check for IPv4, not !IPv6 */ 2511 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2512 !inet_pton(AF_INET6, host, &a))) 2513 ret = add_srcip(cmd, av); 2514 if (ret == NULL && strcmp(av, "any") != 0) 2515 ret = cmd; 2516 2517 free(host); 2518 return ret; 2519 } 2520 2521 static ipfw_insn * 2522 add_dst(ipfw_insn *cmd, char *av, u_char proto) 2523 { 2524 struct in6_addr a; 2525 char *host, *ch; 2526 ipfw_insn *ret = NULL; 2527 2528 if ((host = strdup(av)) == NULL) 2529 return NULL; 2530 if ((ch = strrchr(host, '/')) != NULL) 2531 *ch = '\0'; 2532 2533 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2534 inet_pton(AF_INET6, host, &a)) 2535 ret = add_dstip6(cmd, av); 2536 /* XXX: should check for IPv4, not !IPv6 */ 2537 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2538 !inet_pton(AF_INET6, host, &a))) 2539 ret = add_dstip(cmd, av); 2540 if (ret == NULL && strcmp(av, "any") != 0) 2541 ret = cmd; 2542 2543 free(host); 2544 return ret; 2545 } 2546 2547 /* 2548 * Parse arguments and assemble the microinstructions which make up a rule. 2549 * Rules are added into the 'rulebuf' and then copied in the correct order 2550 * into the actual rule. 2551 * 2552 * The syntax for a rule starts with the action, followed by 2553 * optional action parameters, and the various match patterns. 2554 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2555 * (generated if the rule includes a keep-state option), then the 2556 * various match patterns, log/altq actions, and the actual action. 2557 * 2558 */ 2559 void 2560 ipfw_add(int ac, char *av[]) 2561 { 2562 /* 2563 * rules are added into the 'rulebuf' and then copied in 2564 * the correct order into the actual rule. 2565 * Some things that need to go out of order (prob, action etc.) 2566 * go into actbuf[]. 2567 */ 2568 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2569 2570 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2571 ipfw_insn *first_cmd; /* first match pattern */ 2572 2573 struct ip_fw *rule; 2574 2575 /* 2576 * various flags used to record that we entered some fields. 2577 */ 2578 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2579 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2580 size_t len; 2581 2582 int i; 2583 2584 int open_par = 0; /* open parenthesis ( */ 2585 2586 /* proto is here because it is used to fetch ports */ 2587 u_char proto = IPPROTO_IP; /* default protocol */ 2588 2589 double match_prob = 1; /* match probability, default is always match */ 2590 2591 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2592 bzero(cmdbuf, sizeof(cmdbuf)); 2593 bzero(rulebuf, sizeof(rulebuf)); 2594 2595 rule = (struct ip_fw *)rulebuf; 2596 cmd = (ipfw_insn *)cmdbuf; 2597 action = (ipfw_insn *)actbuf; 2598 2599 av++; ac--; 2600 2601 /* [rule N] -- Rule number optional */ 2602 if (ac && isdigit(**av)) { 2603 rule->rulenum = atoi(*av); 2604 av++; 2605 ac--; 2606 } 2607 2608 /* [set N] -- set number (0..RESVD_SET), optional */ 2609 if (ac > 1 && _substrcmp(*av, "set") == 0) { 2610 int set = strtoul(av[1], NULL, 10); 2611 if (set < 0 || set > RESVD_SET) 2612 errx(EX_DATAERR, "illegal set %s", av[1]); 2613 rule->set = set; 2614 av += 2; ac -= 2; 2615 } 2616 2617 /* [prob D] -- match probability, optional */ 2618 if (ac > 1 && _substrcmp(*av, "prob") == 0) { 2619 match_prob = strtod(av[1], NULL); 2620 2621 if (match_prob <= 0 || match_prob > 1) 2622 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2623 av += 2; ac -= 2; 2624 } 2625 2626 /* action -- mandatory */ 2627 NEED1("missing action"); 2628 i = match_token(rule_actions, *av); 2629 ac--; av++; 2630 action->len = 1; /* default */ 2631 switch(i) { 2632 case TOK_CHECKSTATE: 2633 have_state = action; 2634 action->opcode = O_CHECK_STATE; 2635 break; 2636 2637 case TOK_ACCEPT: 2638 action->opcode = O_ACCEPT; 2639 break; 2640 2641 case TOK_DENY: 2642 action->opcode = O_DENY; 2643 action->arg1 = 0; 2644 break; 2645 2646 case TOK_REJECT: 2647 action->opcode = O_REJECT; 2648 action->arg1 = ICMP_UNREACH_HOST; 2649 break; 2650 2651 case TOK_RESET: 2652 action->opcode = O_REJECT; 2653 action->arg1 = ICMP_REJECT_RST; 2654 break; 2655 2656 case TOK_RESET6: 2657 action->opcode = O_UNREACH6; 2658 action->arg1 = ICMP6_UNREACH_RST; 2659 break; 2660 2661 case TOK_UNREACH: 2662 action->opcode = O_REJECT; 2663 NEED1("missing reject code"); 2664 fill_reject_code(&action->arg1, *av); 2665 ac--; av++; 2666 break; 2667 2668 case TOK_UNREACH6: 2669 action->opcode = O_UNREACH6; 2670 NEED1("missing unreach code"); 2671 fill_unreach6_code(&action->arg1, *av); 2672 ac--; av++; 2673 break; 2674 2675 case TOK_COUNT: 2676 action->opcode = O_COUNT; 2677 break; 2678 2679 case TOK_NAT: 2680 action->opcode = O_NAT; 2681 action->len = F_INSN_SIZE(ipfw_insn_nat); 2682 goto chkarg; 2683 2684 case TOK_QUEUE: 2685 action->opcode = O_QUEUE; 2686 goto chkarg; 2687 case TOK_PIPE: 2688 action->opcode = O_PIPE; 2689 goto chkarg; 2690 case TOK_SKIPTO: 2691 action->opcode = O_SKIPTO; 2692 goto chkarg; 2693 case TOK_NETGRAPH: 2694 action->opcode = O_NETGRAPH; 2695 goto chkarg; 2696 case TOK_NGTEE: 2697 action->opcode = O_NGTEE; 2698 goto chkarg; 2699 case TOK_DIVERT: 2700 action->opcode = O_DIVERT; 2701 goto chkarg; 2702 case TOK_TEE: 2703 action->opcode = O_TEE; 2704 chkarg: 2705 if (!ac) 2706 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2707 if (isdigit(**av)) { 2708 action->arg1 = strtoul(*av, NULL, 10); 2709 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2710 errx(EX_DATAERR, "illegal argument for %s", 2711 *(av - 1)); 2712 } else if (_substrcmp(*av, "tablearg") == 0) { 2713 action->arg1 = IP_FW_TABLEARG; 2714 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2715 struct servent *s; 2716 setservent(1); 2717 s = getservbyname(av[0], "divert"); 2718 if (s != NULL) 2719 action->arg1 = ntohs(s->s_port); 2720 else 2721 errx(EX_DATAERR, "illegal divert/tee port"); 2722 } else 2723 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2724 ac--; av++; 2725 break; 2726 2727 case TOK_FORWARD: { 2728 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2729 char *s, *end; 2730 2731 NEED1("missing forward address[:port]"); 2732 2733 action->opcode = O_FORWARD_IP; 2734 action->len = F_INSN_SIZE(ipfw_insn_sa); 2735 2736 /* 2737 * In the kernel we assume AF_INET and use only 2738 * sin_port and sin_addr. 2739 */ 2740 p->sa.sin_family = AF_INET; 2741 p->sa.sin_port = 0; 2742 /* 2743 * locate the address-port separator (':' or ',') 2744 */ 2745 s = strchr(*av, ':'); 2746 if (s == NULL) 2747 s = strchr(*av, ','); 2748 if (s != NULL) { 2749 *(s++) = '\0'; 2750 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2751 if (s == end) 2752 errx(EX_DATAERR, 2753 "illegal forwarding port ``%s''", s); 2754 p->sa.sin_port = (u_short)i; 2755 } 2756 if (_substrcmp(*av, "tablearg") == 0) 2757 p->sa.sin_addr.s_addr = INADDR_ANY; 2758 else 2759 lookup_host(*av, &(p->sa.sin_addr)); 2760 ac--; av++; 2761 break; 2762 } 2763 case TOK_COMMENT: 2764 /* pretend it is a 'count' rule followed by the comment */ 2765 action->opcode = O_COUNT; 2766 ac++; av--; /* go back... */ 2767 break; 2768 2769 case TOK_SETFIB: 2770 { 2771 int numfibs; 2772 size_t intsize = sizeof(int); 2773 2774 action->opcode = O_SETFIB; 2775 NEED1("missing fib number"); 2776 action->arg1 = strtoul(*av, NULL, 10); 2777 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2778 errx(EX_DATAERR, "fibs not suported.\n"); 2779 if (action->arg1 >= numfibs) /* Temporary */ 2780 errx(EX_DATAERR, "fib too large.\n"); 2781 ac--; av++; 2782 break; 2783 } 2784 2785 default: 2786 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2787 } 2788 action = next_cmd(action); 2789 2790 /* 2791 * [altq queuename] -- altq tag, optional 2792 * [log [logamount N]] -- log, optional 2793 * 2794 * If they exist, it go first in the cmdbuf, but then it is 2795 * skipped in the copy section to the end of the buffer. 2796 */ 2797 while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) { 2798 ac--; av++; 2799 switch (i) { 2800 case TOK_LOG: 2801 { 2802 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2803 int l; 2804 2805 if (have_log) 2806 errx(EX_DATAERR, 2807 "log cannot be specified more than once"); 2808 have_log = (ipfw_insn *)c; 2809 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2810 cmd->opcode = O_LOG; 2811 if (ac && _substrcmp(*av, "logamount") == 0) { 2812 ac--; av++; 2813 NEED1("logamount requires argument"); 2814 l = atoi(*av); 2815 if (l < 0) 2816 errx(EX_DATAERR, 2817 "logamount must be positive"); 2818 c->max_log = l; 2819 ac--; av++; 2820 } else { 2821 len = sizeof(c->max_log); 2822 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2823 &c->max_log, &len, NULL, 0) == -1) 2824 errx(1, "sysctlbyname(\"%s\")", 2825 "net.inet.ip.fw.verbose_limit"); 2826 } 2827 } 2828 break; 2829 2830 case TOK_ALTQ: 2831 { 2832 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2833 2834 NEED1("missing altq queue name"); 2835 if (have_altq) 2836 errx(EX_DATAERR, 2837 "altq cannot be specified more than once"); 2838 have_altq = (ipfw_insn *)a; 2839 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2840 cmd->opcode = O_ALTQ; 2841 a->qid = altq_name_to_qid(*av); 2842 ac--; av++; 2843 } 2844 break; 2845 2846 case TOK_TAG: 2847 case TOK_UNTAG: { 2848 uint16_t tag; 2849 2850 if (have_tag) 2851 errx(EX_USAGE, "tag and untag cannot be " 2852 "specified more than once"); 2853 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, i, 2854 rule_action_params); 2855 have_tag = cmd; 2856 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2857 ac--; av++; 2858 break; 2859 } 2860 2861 default: 2862 abort(); 2863 } 2864 cmd = next_cmd(cmd); 2865 } 2866 2867 if (have_state) /* must be a check-state, we are done */ 2868 goto done; 2869 2870 #define OR_START(target) \ 2871 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2872 if (open_par) \ 2873 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2874 prev = NULL; \ 2875 open_par = 1; \ 2876 if ( (av[0])[1] == '\0') { \ 2877 ac--; av++; \ 2878 } else \ 2879 (*av)++; \ 2880 } \ 2881 target: \ 2882 2883 2884 #define CLOSE_PAR \ 2885 if (open_par) { \ 2886 if (ac && ( \ 2887 strcmp(*av, ")") == 0 || \ 2888 strcmp(*av, "}") == 0)) { \ 2889 prev = NULL; \ 2890 open_par = 0; \ 2891 ac--; av++; \ 2892 } else \ 2893 errx(EX_USAGE, "missing \")\"\n"); \ 2894 } 2895 2896 #define NOT_BLOCK \ 2897 if (ac && _substrcmp(*av, "not") == 0) { \ 2898 if (cmd->len & F_NOT) \ 2899 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2900 cmd->len |= F_NOT; \ 2901 ac--; av++; \ 2902 } 2903 2904 #define OR_BLOCK(target) \ 2905 if (ac && _substrcmp(*av, "or") == 0) { \ 2906 if (prev == NULL || open_par == 0) \ 2907 errx(EX_DATAERR, "invalid OR block"); \ 2908 prev->len |= F_OR; \ 2909 ac--; av++; \ 2910 goto target; \ 2911 } \ 2912 CLOSE_PAR; 2913 2914 first_cmd = cmd; 2915 2916 #if 0 2917 /* 2918 * MAC addresses, optional. 2919 * If we have this, we skip the part "proto from src to dst" 2920 * and jump straight to the option parsing. 2921 */ 2922 NOT_BLOCK; 2923 NEED1("missing protocol"); 2924 if (_substrcmp(*av, "MAC") == 0 || 2925 _substrcmp(*av, "mac") == 0) { 2926 ac--; av++; /* the "MAC" keyword */ 2927 add_mac(cmd, ac, av); /* exits in case of errors */ 2928 cmd = next_cmd(cmd); 2929 ac -= 2; av += 2; /* dst-mac and src-mac */ 2930 NOT_BLOCK; 2931 NEED1("missing mac type"); 2932 if (add_mactype(cmd, ac, av[0])) 2933 cmd = next_cmd(cmd); 2934 ac--; av++; /* any or mac-type */ 2935 goto read_options; 2936 } 2937 #endif 2938 2939 /* 2940 * protocol, mandatory 2941 */ 2942 OR_START(get_proto); 2943 NOT_BLOCK; 2944 NEED1("missing protocol"); 2945 if (add_proto_compat(cmd, *av, &proto)) { 2946 av++; ac--; 2947 if (F_LEN(cmd) != 0) { 2948 prev = cmd; 2949 cmd = next_cmd(cmd); 2950 } 2951 } else if (first_cmd != cmd) { 2952 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 2953 } else 2954 goto read_options; 2955 OR_BLOCK(get_proto); 2956 2957 /* 2958 * "from", mandatory 2959 */ 2960 if (!ac || _substrcmp(*av, "from") != 0) 2961 errx(EX_USAGE, "missing ``from''"); 2962 ac--; av++; 2963 2964 /* 2965 * source IP, mandatory 2966 */ 2967 OR_START(source_ip); 2968 NOT_BLOCK; /* optional "not" */ 2969 NEED1("missing source address"); 2970 if (add_src(cmd, *av, proto)) { 2971 ac--; av++; 2972 if (F_LEN(cmd) != 0) { /* ! any */ 2973 prev = cmd; 2974 cmd = next_cmd(cmd); 2975 } 2976 } else 2977 errx(EX_USAGE, "bad source address %s", *av); 2978 OR_BLOCK(source_ip); 2979 2980 /* 2981 * source ports, optional 2982 */ 2983 NOT_BLOCK; /* optional "not" */ 2984 if (ac) { 2985 if (_substrcmp(*av, "any") == 0 || 2986 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 2987 ac--; av++; 2988 if (F_LEN(cmd) != 0) 2989 cmd = next_cmd(cmd); 2990 } 2991 } 2992 2993 /* 2994 * "to", mandatory 2995 */ 2996 if (!ac || _substrcmp(*av, "to") != 0) 2997 errx(EX_USAGE, "missing ``to''"); 2998 av++; ac--; 2999 3000 /* 3001 * destination, mandatory 3002 */ 3003 OR_START(dest_ip); 3004 NOT_BLOCK; /* optional "not" */ 3005 NEED1("missing dst address"); 3006 if (add_dst(cmd, *av, proto)) { 3007 ac--; av++; 3008 if (F_LEN(cmd) != 0) { /* ! any */ 3009 prev = cmd; 3010 cmd = next_cmd(cmd); 3011 } 3012 } else 3013 errx( EX_USAGE, "bad destination address %s", *av); 3014 OR_BLOCK(dest_ip); 3015 3016 /* 3017 * dest. ports, optional 3018 */ 3019 NOT_BLOCK; /* optional "not" */ 3020 if (ac) { 3021 if (_substrcmp(*av, "any") == 0 || 3022 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3023 ac--; av++; 3024 if (F_LEN(cmd) != 0) 3025 cmd = next_cmd(cmd); 3026 } 3027 } 3028 3029 read_options: 3030 if (ac && first_cmd == cmd) { 3031 /* 3032 * nothing specified so far, store in the rule to ease 3033 * printout later. 3034 */ 3035 rule->_pad = 1; 3036 } 3037 prev = NULL; 3038 while (ac) { 3039 char *s; 3040 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3041 3042 s = *av; 3043 cmd32 = (ipfw_insn_u32 *)cmd; 3044 3045 if (*s == '!') { /* alternate syntax for NOT */ 3046 if (cmd->len & F_NOT) 3047 errx(EX_USAGE, "double \"not\" not allowed\n"); 3048 cmd->len = F_NOT; 3049 s++; 3050 } 3051 i = match_token(rule_options, s); 3052 ac--; av++; 3053 switch(i) { 3054 case TOK_NOT: 3055 if (cmd->len & F_NOT) 3056 errx(EX_USAGE, "double \"not\" not allowed\n"); 3057 cmd->len = F_NOT; 3058 break; 3059 3060 case TOK_OR: 3061 if (open_par == 0 || prev == NULL) 3062 errx(EX_USAGE, "invalid \"or\" block\n"); 3063 prev->len |= F_OR; 3064 break; 3065 3066 case TOK_STARTBRACE: 3067 if (open_par) 3068 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3069 open_par = 1; 3070 break; 3071 3072 case TOK_ENDBRACE: 3073 if (!open_par) 3074 errx(EX_USAGE, "+missing \")\"\n"); 3075 open_par = 0; 3076 prev = NULL; 3077 break; 3078 3079 case TOK_IN: 3080 fill_cmd(cmd, O_IN, 0, 0); 3081 break; 3082 3083 case TOK_OUT: 3084 cmd->len ^= F_NOT; /* toggle F_NOT */ 3085 fill_cmd(cmd, O_IN, 0, 0); 3086 break; 3087 3088 case TOK_DIVERTED: 3089 fill_cmd(cmd, O_DIVERTED, 0, 3); 3090 break; 3091 3092 case TOK_DIVERTEDLOOPBACK: 3093 fill_cmd(cmd, O_DIVERTED, 0, 1); 3094 break; 3095 3096 case TOK_DIVERTEDOUTPUT: 3097 fill_cmd(cmd, O_DIVERTED, 0, 2); 3098 break; 3099 3100 case TOK_FRAG: 3101 fill_cmd(cmd, O_FRAG, 0, 0); 3102 break; 3103 3104 case TOK_LAYER2: 3105 fill_cmd(cmd, O_LAYER2, 0, 0); 3106 break; 3107 3108 case TOK_XMIT: 3109 case TOK_RECV: 3110 case TOK_VIA: 3111 NEED1("recv, xmit, via require interface name" 3112 " or address"); 3113 fill_iface((ipfw_insn_if *)cmd, av[0]); 3114 ac--; av++; 3115 if (F_LEN(cmd) == 0) /* not a valid address */ 3116 break; 3117 if (i == TOK_XMIT) 3118 cmd->opcode = O_XMIT; 3119 else if (i == TOK_RECV) 3120 cmd->opcode = O_RECV; 3121 else if (i == TOK_VIA) 3122 cmd->opcode = O_VIA; 3123 break; 3124 3125 case TOK_ICMPTYPES: 3126 NEED1("icmptypes requires list of types"); 3127 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3128 av++; ac--; 3129 break; 3130 3131 case TOK_ICMP6TYPES: 3132 NEED1("icmptypes requires list of types"); 3133 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3134 av++; ac--; 3135 break; 3136 3137 case TOK_IPTTL: 3138 NEED1("ipttl requires TTL"); 3139 if (strpbrk(*av, "-,")) { 3140 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3141 errx(EX_DATAERR, "invalid ipttl %s", *av); 3142 } else 3143 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3144 ac--; av++; 3145 break; 3146 3147 case TOK_IPID: 3148 NEED1("ipid requires id"); 3149 if (strpbrk(*av, "-,")) { 3150 if (!add_ports(cmd, *av, 0, O_IPID)) 3151 errx(EX_DATAERR, "invalid ipid %s", *av); 3152 } else 3153 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3154 ac--; av++; 3155 break; 3156 3157 case TOK_IPLEN: 3158 NEED1("iplen requires length"); 3159 if (strpbrk(*av, "-,")) { 3160 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3161 errx(EX_DATAERR, "invalid ip len %s", *av); 3162 } else 3163 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3164 ac--; av++; 3165 break; 3166 3167 case TOK_IPVER: 3168 NEED1("ipver requires version"); 3169 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3170 ac--; av++; 3171 break; 3172 3173 case TOK_IPPRECEDENCE: 3174 NEED1("ipprecedence requires value"); 3175 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3176 (strtoul(*av, NULL, 0) & 7) << 5); 3177 ac--; av++; 3178 break; 3179 3180 case TOK_IPOPTS: 3181 NEED1("missing argument for ipoptions"); 3182 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3183 ac--; av++; 3184 break; 3185 3186 case TOK_IPTOS: 3187 NEED1("missing argument for iptos"); 3188 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3189 ac--; av++; 3190 break; 3191 3192 case TOK_UID: 3193 NEED1("uid requires argument"); 3194 { 3195 char *end; 3196 uid_t uid; 3197 struct passwd *pwd; 3198 3199 cmd->opcode = O_UID; 3200 uid = strtoul(*av, &end, 0); 3201 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3202 if (pwd == NULL) 3203 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3204 cmd32->d[0] = pwd->pw_uid; 3205 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3206 ac--; av++; 3207 } 3208 break; 3209 3210 case TOK_GID: 3211 NEED1("gid requires argument"); 3212 { 3213 char *end; 3214 gid_t gid; 3215 struct group *grp; 3216 3217 cmd->opcode = O_GID; 3218 gid = strtoul(*av, &end, 0); 3219 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3220 if (grp == NULL) 3221 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3222 cmd32->d[0] = grp->gr_gid; 3223 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3224 ac--; av++; 3225 } 3226 break; 3227 3228 case TOK_JAIL: 3229 NEED1("jail requires argument"); 3230 { 3231 char *end; 3232 int jid; 3233 3234 cmd->opcode = O_JAIL; 3235 jid = (int)strtol(*av, &end, 0); 3236 if (jid < 0 || *end != '\0') 3237 errx(EX_DATAERR, "jail requires prison ID"); 3238 cmd32->d[0] = (uint32_t)jid; 3239 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3240 ac--; av++; 3241 } 3242 break; 3243 3244 case TOK_ESTAB: 3245 fill_cmd(cmd, O_ESTAB, 0, 0); 3246 break; 3247 3248 case TOK_SETUP: 3249 fill_cmd(cmd, O_TCPFLAGS, 0, 3250 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3251 break; 3252 3253 case TOK_TCPDATALEN: 3254 NEED1("tcpdatalen requires length"); 3255 if (strpbrk(*av, "-,")) { 3256 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3257 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3258 } else 3259 fill_cmd(cmd, O_TCPDATALEN, 0, 3260 strtoul(*av, NULL, 0)); 3261 ac--; av++; 3262 break; 3263 3264 case TOK_TCPOPTS: 3265 NEED1("missing argument for tcpoptions"); 3266 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3267 ac--; av++; 3268 break; 3269 3270 case TOK_TCPSEQ: 3271 case TOK_TCPACK: 3272 NEED1("tcpseq/tcpack requires argument"); 3273 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3274 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3275 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3276 ac--; av++; 3277 break; 3278 3279 case TOK_TCPWIN: 3280 NEED1("tcpwin requires length"); 3281 fill_cmd(cmd, O_TCPWIN, 0, 3282 htons(strtoul(*av, NULL, 0))); 3283 ac--; av++; 3284 break; 3285 3286 case TOK_TCPFLAGS: 3287 NEED1("missing argument for tcpflags"); 3288 cmd->opcode = O_TCPFLAGS; 3289 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3290 ac--; av++; 3291 break; 3292 3293 case TOK_KEEPSTATE: 3294 if (open_par) 3295 errx(EX_USAGE, "keep-state cannot be part " 3296 "of an or block"); 3297 if (have_state) 3298 errx(EX_USAGE, "only one of keep-state " 3299 "and limit is allowed"); 3300 have_state = cmd; 3301 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3302 break; 3303 3304 case TOK_LIMIT: { 3305 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3306 int val; 3307 3308 if (open_par) 3309 errx(EX_USAGE, 3310 "limit cannot be part of an or block"); 3311 if (have_state) 3312 errx(EX_USAGE, "only one of keep-state and " 3313 "limit is allowed"); 3314 have_state = cmd; 3315 3316 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3317 cmd->opcode = O_LIMIT; 3318 c->limit_mask = c->conn_limit = 0; 3319 3320 while (ac > 0) { 3321 if ((val = match_token(limit_masks, *av)) <= 0) 3322 break; 3323 c->limit_mask |= val; 3324 ac--; av++; 3325 } 3326 3327 if (c->limit_mask == 0) 3328 errx(EX_USAGE, "limit: missing limit mask"); 3329 3330 GET_UINT_ARG(c->conn_limit, 1, IPFW_DEFAULT_RULE - 1, 3331 TOK_LIMIT, rule_options); 3332 3333 ac--; av++; 3334 break; 3335 } 3336 3337 case TOK_PROTO: 3338 NEED1("missing protocol"); 3339 if (add_proto(cmd, *av, &proto)) { 3340 ac--; av++; 3341 } else 3342 errx(EX_DATAERR, "invalid protocol ``%s''", 3343 *av); 3344 break; 3345 3346 case TOK_SRCIP: 3347 NEED1("missing source IP"); 3348 if (add_srcip(cmd, *av)) { 3349 ac--; av++; 3350 } 3351 break; 3352 3353 case TOK_DSTIP: 3354 NEED1("missing destination IP"); 3355 if (add_dstip(cmd, *av)) { 3356 ac--; av++; 3357 } 3358 break; 3359 3360 case TOK_SRCIP6: 3361 NEED1("missing source IP6"); 3362 if (add_srcip6(cmd, *av)) { 3363 ac--; av++; 3364 } 3365 break; 3366 3367 case TOK_DSTIP6: 3368 NEED1("missing destination IP6"); 3369 if (add_dstip6(cmd, *av)) { 3370 ac--; av++; 3371 } 3372 break; 3373 3374 case TOK_SRCPORT: 3375 NEED1("missing source port"); 3376 if (_substrcmp(*av, "any") == 0 || 3377 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3378 ac--; av++; 3379 } else 3380 errx(EX_DATAERR, "invalid source port %s", *av); 3381 break; 3382 3383 case TOK_DSTPORT: 3384 NEED1("missing destination port"); 3385 if (_substrcmp(*av, "any") == 0 || 3386 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3387 ac--; av++; 3388 } else 3389 errx(EX_DATAERR, "invalid destination port %s", 3390 *av); 3391 break; 3392 3393 case TOK_MAC: 3394 if (add_mac(cmd, ac, av)) { 3395 ac -= 2; av += 2; 3396 } 3397 break; 3398 3399 case TOK_MACTYPE: 3400 NEED1("missing mac type"); 3401 if (!add_mactype(cmd, ac, *av)) 3402 errx(EX_DATAERR, "invalid mac type %s", *av); 3403 ac--; av++; 3404 break; 3405 3406 case TOK_VERREVPATH: 3407 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3408 break; 3409 3410 case TOK_VERSRCREACH: 3411 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3412 break; 3413 3414 case TOK_ANTISPOOF: 3415 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3416 break; 3417 3418 case TOK_IPSEC: 3419 fill_cmd(cmd, O_IPSEC, 0, 0); 3420 break; 3421 3422 case TOK_IPV6: 3423 fill_cmd(cmd, O_IP6, 0, 0); 3424 break; 3425 3426 case TOK_IPV4: 3427 fill_cmd(cmd, O_IP4, 0, 0); 3428 break; 3429 3430 case TOK_EXT6HDR: 3431 fill_ext6hdr( cmd, *av ); 3432 ac--; av++; 3433 break; 3434 3435 case TOK_FLOWID: 3436 if (proto != IPPROTO_IPV6 ) 3437 errx( EX_USAGE, "flow-id filter is active " 3438 "only for ipv6 protocol\n"); 3439 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3440 ac--; av++; 3441 break; 3442 3443 case TOK_COMMENT: 3444 fill_comment(cmd, ac, av); 3445 av += ac; 3446 ac = 0; 3447 break; 3448 3449 case TOK_TAGGED: 3450 if (ac > 0 && strpbrk(*av, "-,")) { 3451 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3452 errx(EX_DATAERR, "tagged: invalid tag" 3453 " list: %s", *av); 3454 } 3455 else { 3456 uint16_t tag; 3457 3458 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, 3459 TOK_TAGGED, rule_options); 3460 fill_cmd(cmd, O_TAGGED, 0, tag); 3461 } 3462 ac--; av++; 3463 break; 3464 3465 case TOK_FIB: 3466 NEED1("fib requires fib number"); 3467 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3468 ac--; av++; 3469 break; 3470 3471 default: 3472 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3473 } 3474 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3475 prev = cmd; 3476 cmd = next_cmd(cmd); 3477 } 3478 } 3479 3480 done: 3481 /* 3482 * Now copy stuff into the rule. 3483 * If we have a keep-state option, the first instruction 3484 * must be a PROBE_STATE (which is generated here). 3485 * If we have a LOG option, it was stored as the first command, 3486 * and now must be moved to the top of the action part. 3487 */ 3488 dst = (ipfw_insn *)rule->cmd; 3489 3490 /* 3491 * First thing to write into the command stream is the match probability. 3492 */ 3493 if (match_prob != 1) { /* 1 means always match */ 3494 dst->opcode = O_PROB; 3495 dst->len = 2; 3496 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3497 dst += dst->len; 3498 } 3499 3500 /* 3501 * generate O_PROBE_STATE if necessary 3502 */ 3503 if (have_state && have_state->opcode != O_CHECK_STATE) { 3504 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3505 dst = next_cmd(dst); 3506 } 3507 3508 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3509 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3510 i = F_LEN(src); 3511 3512 switch (src->opcode) { 3513 case O_LOG: 3514 case O_KEEP_STATE: 3515 case O_LIMIT: 3516 case O_ALTQ: 3517 case O_TAG: 3518 break; 3519 default: 3520 bcopy(src, dst, i * sizeof(uint32_t)); 3521 dst += i; 3522 } 3523 } 3524 3525 /* 3526 * put back the have_state command as last opcode 3527 */ 3528 if (have_state && have_state->opcode != O_CHECK_STATE) { 3529 i = F_LEN(have_state); 3530 bcopy(have_state, dst, i * sizeof(uint32_t)); 3531 dst += i; 3532 } 3533 /* 3534 * start action section 3535 */ 3536 rule->act_ofs = dst - rule->cmd; 3537 3538 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3539 if (have_log) { 3540 i = F_LEN(have_log); 3541 bcopy(have_log, dst, i * sizeof(uint32_t)); 3542 dst += i; 3543 } 3544 if (have_altq) { 3545 i = F_LEN(have_altq); 3546 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3547 dst += i; 3548 } 3549 if (have_tag) { 3550 i = F_LEN(have_tag); 3551 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3552 dst += i; 3553 } 3554 /* 3555 * copy all other actions 3556 */ 3557 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3558 i = F_LEN(src); 3559 bcopy(src, dst, i * sizeof(uint32_t)); 3560 dst += i; 3561 } 3562 3563 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3564 i = (char *)dst - (char *)rule; 3565 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3566 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3567 if (!co.do_quiet) 3568 show_ipfw(rule, 0, 0); 3569 } 3570 3571 /* 3572 * clear the counters or the log counters. 3573 */ 3574 void 3575 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3576 { 3577 uint32_t arg, saved_arg; 3578 int failed = EX_OK; 3579 char const *errstr; 3580 char const *name = optname ? "RESETLOG" : "ZERO"; 3581 3582 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3583 3584 av++; ac--; 3585 3586 if (!ac) { 3587 /* clear all entries */ 3588 if (do_cmd(optname, NULL, 0) < 0) 3589 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3590 if (!co.do_quiet) 3591 printf("%s.\n", optname == IP_FW_ZERO ? 3592 "Accounting cleared":"Logging counts reset"); 3593 3594 return; 3595 } 3596 3597 while (ac) { 3598 /* Rule number */ 3599 if (isdigit(**av)) { 3600 arg = strtonum(*av, 0, 0xffff, &errstr); 3601 if (errstr) 3602 errx(EX_DATAERR, 3603 "invalid rule number %s\n", *av); 3604 saved_arg = arg; 3605 if (co.use_set) 3606 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3607 av++; 3608 ac--; 3609 if (do_cmd(optname, &arg, sizeof(arg))) { 3610 warn("rule %u: setsockopt(IP_FW_%s)", 3611 saved_arg, name); 3612 failed = EX_UNAVAILABLE; 3613 } else if (!co.do_quiet) 3614 printf("Entry %d %s.\n", saved_arg, 3615 optname == IP_FW_ZERO ? 3616 "cleared" : "logging count reset"); 3617 } else { 3618 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3619 } 3620 } 3621 if (failed != EX_OK) 3622 exit(failed); 3623 } 3624 3625 void 3626 ipfw_flush(int force) 3627 { 3628 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3629 3630 if (!force && !co.do_quiet) { /* need to ask user */ 3631 int c; 3632 3633 printf("Are you sure? [yn] "); 3634 fflush(stdout); 3635 do { 3636 c = toupper(getc(stdin)); 3637 while (c != '\n' && getc(stdin) != '\n') 3638 if (feof(stdin)) 3639 return; /* and do not flush */ 3640 } while (c != 'Y' && c != 'N'); 3641 printf("\n"); 3642 if (c == 'N') /* user said no */ 3643 return; 3644 } 3645 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3646 if (co.use_set) { 3647 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3648 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3649 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3650 } else if (do_cmd(cmd, NULL, 0) < 0) 3651 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3652 co.do_pipe ? "DUMMYNET" : "FW"); 3653 if (!co.do_quiet) 3654 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3655 } 3656 3657 3658 static void table_list(ipfw_table_entry ent, int need_header); 3659 3660 /* 3661 * This one handles all table-related commands 3662 * ipfw table N add addr[/masklen] [value] 3663 * ipfw table N delete addr[/masklen] 3664 * ipfw table {N | all} flush 3665 * ipfw table {N | all} list 3666 */ 3667 void 3668 ipfw_table_handler(int ac, char *av[]) 3669 { 3670 ipfw_table_entry ent; 3671 int do_add; 3672 int is_all; 3673 size_t len; 3674 char *p; 3675 uint32_t a; 3676 uint32_t tables_max; 3677 3678 len = sizeof(tables_max); 3679 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3680 NULL, 0) == -1) { 3681 #ifdef IPFW_TABLES_MAX 3682 warn("Warn: Failed to get the max tables number via sysctl. " 3683 "Using the compiled in defaults. \nThe reason was"); 3684 tables_max = IPFW_TABLES_MAX; 3685 #else 3686 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3687 #endif 3688 } 3689 3690 ac--; av++; 3691 if (ac && isdigit(**av)) { 3692 ent.tbl = atoi(*av); 3693 is_all = 0; 3694 ac--; av++; 3695 } else if (ac && _substrcmp(*av, "all") == 0) { 3696 ent.tbl = 0; 3697 is_all = 1; 3698 ac--; av++; 3699 } else 3700 errx(EX_USAGE, "table number or 'all' keyword required"); 3701 if (ent.tbl >= tables_max) 3702 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3703 "value (%d)", tables_max - 1); 3704 NEED1("table needs command"); 3705 if (is_all && _substrcmp(*av, "list") != 0 3706 && _substrcmp(*av, "flush") != 0) 3707 errx(EX_USAGE, "table number required"); 3708 3709 if (_substrcmp(*av, "add") == 0 || 3710 _substrcmp(*av, "delete") == 0) { 3711 do_add = **av == 'a'; 3712 ac--; av++; 3713 if (!ac) 3714 errx(EX_USAGE, "IP address required"); 3715 p = strchr(*av, '/'); 3716 if (p) { 3717 *p++ = '\0'; 3718 ent.masklen = atoi(p); 3719 if (ent.masklen > 32) 3720 errx(EX_DATAERR, "bad width ``%s''", p); 3721 } else 3722 ent.masklen = 32; 3723 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3724 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3725 ac--; av++; 3726 if (do_add && ac) { 3727 unsigned int tval; 3728 /* isdigit is a bit of a hack here.. */ 3729 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3730 ent.value = strtoul(*av, NULL, 0); 3731 } else { 3732 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3733 /* The value must be stored in host order * 3734 * so that the values < 65k can be distinguished */ 3735 ent.value = ntohl(tval); 3736 } else { 3737 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3738 } 3739 } 3740 } else 3741 ent.value = 0; 3742 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3743 &ent, sizeof(ent)) < 0) { 3744 /* If running silent, don't bomb out on these errors. */ 3745 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3746 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3747 do_add ? "ADD" : "DEL"); 3748 /* In silent mode, react to a failed add by deleting */ 3749 if (do_add) { 3750 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3751 if (do_cmd(IP_FW_TABLE_ADD, 3752 &ent, sizeof(ent)) < 0) 3753 err(EX_OSERR, 3754 "setsockopt(IP_FW_TABLE_ADD)"); 3755 } 3756 } 3757 } else if (_substrcmp(*av, "flush") == 0) { 3758 a = is_all ? tables_max : (ent.tbl + 1); 3759 do { 3760 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3761 sizeof(ent.tbl)) < 0) 3762 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3763 } while (++ent.tbl < a); 3764 } else if (_substrcmp(*av, "list") == 0) { 3765 a = is_all ? tables_max : (ent.tbl + 1); 3766 do { 3767 table_list(ent, is_all); 3768 } while (++ent.tbl < a); 3769 } else 3770 errx(EX_USAGE, "invalid table command %s", *av); 3771 } 3772 3773 static void 3774 table_list(ipfw_table_entry ent, int need_header) 3775 { 3776 ipfw_table *tbl; 3777 socklen_t l; 3778 uint32_t a; 3779 3780 a = ent.tbl; 3781 l = sizeof(a); 3782 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3783 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3784 3785 /* If a is zero we have nothing to do, the table is empty. */ 3786 if (a == 0) 3787 return; 3788 3789 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3790 tbl = safe_calloc(1, l); 3791 tbl->tbl = ent.tbl; 3792 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3793 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3794 if (tbl->cnt && need_header) 3795 printf("---table(%d)---\n", tbl->tbl); 3796 for (a = 0; a < tbl->cnt; a++) { 3797 unsigned int tval; 3798 tval = tbl->ent[a].value; 3799 if (co.do_value_as_ip) { 3800 char tbuf[128]; 3801 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3802 &tbl->ent[a].addr), 127); 3803 /* inet_ntoa expects network order */ 3804 tval = htonl(tval); 3805 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3806 inet_ntoa(*(struct in_addr *)&tval)); 3807 } else { 3808 printf("%s/%u %u\n", 3809 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3810 tbl->ent[a].masklen, tval); 3811 } 3812 } 3813 free(tbl); 3814 } 3815