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