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