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 <timeconv.h> /* _long_to_time */ 41 #include <unistd.h> 42 #include <fcntl.h> 43 44 #define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */ 45 46 #include <net/ethernet.h> 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/pfvar.h> 50 #include <net/route.h> /* def. of struct route */ 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_icmp.h> 55 #include <netinet/ip_fw.h> 56 #include <netinet/tcp.h> 57 #include <arpa/inet.h> 58 59 struct cmdline_opts co; /* global options */ 60 61 int resvd_set_number = RESVD_SET; 62 63 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 64 if (!ac) \ 65 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 66 if (_substrcmp(*av, "tablearg") == 0) { \ 67 arg = IP_FW_TABLEARG; \ 68 break; \ 69 } \ 70 \ 71 { \ 72 long val; \ 73 char *end; \ 74 \ 75 val = strtol(*av, &end, 10); \ 76 \ 77 if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \ 78 errx(EX_DATAERR, "%s: invalid argument: %s", \ 79 match_value(s_x, tok), *av); \ 80 \ 81 if (errno == ERANGE || val < min || val > max) \ 82 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 83 match_value(s_x, tok), min, max, *av); \ 84 \ 85 if (val == IP_FW_TABLEARG) \ 86 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 87 match_value(s_x, tok), *av); \ 88 arg = val; \ 89 } \ 90 } while (0) 91 92 static void 93 PRINT_UINT_ARG(const char *str, uint32_t arg) 94 { 95 if (str != NULL) 96 printf("%s",str); 97 if (arg == IP_FW_TABLEARG) 98 printf("tablearg"); 99 else 100 printf("%u", arg); 101 } 102 103 static struct _s_x f_tcpflags[] = { 104 { "syn", TH_SYN }, 105 { "fin", TH_FIN }, 106 { "ack", TH_ACK }, 107 { "psh", TH_PUSH }, 108 { "rst", TH_RST }, 109 { "urg", TH_URG }, 110 { "tcp flag", 0 }, 111 { NULL, 0 } 112 }; 113 114 static struct _s_x f_tcpopts[] = { 115 { "mss", IP_FW_TCPOPT_MSS }, 116 { "maxseg", IP_FW_TCPOPT_MSS }, 117 { "window", IP_FW_TCPOPT_WINDOW }, 118 { "sack", IP_FW_TCPOPT_SACK }, 119 { "ts", IP_FW_TCPOPT_TS }, 120 { "timestamp", IP_FW_TCPOPT_TS }, 121 { "cc", IP_FW_TCPOPT_CC }, 122 { "tcp option", 0 }, 123 { NULL, 0 } 124 }; 125 126 /* 127 * IP options span the range 0 to 255 so we need to remap them 128 * (though in fact only the low 5 bits are significant). 129 */ 130 static struct _s_x f_ipopts[] = { 131 { "ssrr", IP_FW_IPOPT_SSRR}, 132 { "lsrr", IP_FW_IPOPT_LSRR}, 133 { "rr", IP_FW_IPOPT_RR}, 134 { "ts", IP_FW_IPOPT_TS}, 135 { "ip option", 0 }, 136 { NULL, 0 } 137 }; 138 139 static struct _s_x f_iptos[] = { 140 { "lowdelay", IPTOS_LOWDELAY}, 141 { "throughput", IPTOS_THROUGHPUT}, 142 { "reliability", IPTOS_RELIABILITY}, 143 { "mincost", IPTOS_MINCOST}, 144 { "congestion", IPTOS_ECN_CE}, 145 { "ecntransport", IPTOS_ECN_ECT0}, 146 { "ip tos option", 0}, 147 { NULL, 0 } 148 }; 149 150 static struct _s_x limit_masks[] = { 151 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 152 {"src-addr", DYN_SRC_ADDR}, 153 {"src-port", DYN_SRC_PORT}, 154 {"dst-addr", DYN_DST_ADDR}, 155 {"dst-port", DYN_DST_PORT}, 156 {NULL, 0} 157 }; 158 159 /* 160 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 161 * This is only used in this code. 162 */ 163 #define IPPROTO_ETHERTYPE 0x1000 164 static struct _s_x ether_types[] = { 165 /* 166 * Note, we cannot use "-:&/" in the names because they are field 167 * separators in the type specifications. Also, we use s = NULL as 168 * end-delimiter, because a type of 0 can be legal. 169 */ 170 { "ip", 0x0800 }, 171 { "ipv4", 0x0800 }, 172 { "ipv6", 0x86dd }, 173 { "arp", 0x0806 }, 174 { "rarp", 0x8035 }, 175 { "vlan", 0x8100 }, 176 { "loop", 0x9000 }, 177 { "trail", 0x1000 }, 178 { "at", 0x809b }, 179 { "atalk", 0x809b }, 180 { "aarp", 0x80f3 }, 181 { "pppoe_disc", 0x8863 }, 182 { "pppoe_sess", 0x8864 }, 183 { "ipx_8022", 0x00E0 }, 184 { "ipx_8023", 0x0000 }, 185 { "ipx_ii", 0x8137 }, 186 { "ipx_snap", 0x8137 }, 187 { "ipx", 0x8137 }, 188 { "ns", 0x0600 }, 189 { NULL, 0 } 190 }; 191 192 193 static struct _s_x rule_actions[] = { 194 { "accept", TOK_ACCEPT }, 195 { "pass", TOK_ACCEPT }, 196 { "allow", TOK_ACCEPT }, 197 { "permit", TOK_ACCEPT }, 198 { "count", TOK_COUNT }, 199 { "pipe", TOK_PIPE }, 200 { "queue", TOK_QUEUE }, 201 { "divert", TOK_DIVERT }, 202 { "tee", TOK_TEE }, 203 { "netgraph", TOK_NETGRAPH }, 204 { "ngtee", TOK_NGTEE }, 205 { "fwd", TOK_FORWARD }, 206 { "forward", TOK_FORWARD }, 207 { "skipto", TOK_SKIPTO }, 208 { "deny", TOK_DENY }, 209 { "drop", TOK_DENY }, 210 { "reject", TOK_REJECT }, 211 { "reset6", TOK_RESET6 }, 212 { "reset", TOK_RESET }, 213 { "unreach6", TOK_UNREACH6 }, 214 { "unreach", TOK_UNREACH }, 215 { "check-state", TOK_CHECKSTATE }, 216 { "//", TOK_COMMENT }, 217 { "nat", TOK_NAT }, 218 { "setfib", TOK_SETFIB }, 219 { NULL, 0 } /* terminator */ 220 }; 221 222 static struct _s_x rule_action_params[] = { 223 { "altq", TOK_ALTQ }, 224 { "log", TOK_LOG }, 225 { "tag", TOK_TAG }, 226 { "untag", TOK_UNTAG }, 227 { NULL, 0 } /* terminator */ 228 }; 229 230 static struct _s_x rule_options[] = { 231 { "tagged", TOK_TAGGED }, 232 { "uid", TOK_UID }, 233 { "gid", TOK_GID }, 234 { "jail", TOK_JAIL }, 235 { "in", TOK_IN }, 236 { "limit", TOK_LIMIT }, 237 { "keep-state", TOK_KEEPSTATE }, 238 { "bridged", TOK_LAYER2 }, 239 { "layer2", TOK_LAYER2 }, 240 { "out", TOK_OUT }, 241 { "diverted", TOK_DIVERTED }, 242 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 243 { "diverted-output", TOK_DIVERTEDOUTPUT }, 244 { "xmit", TOK_XMIT }, 245 { "recv", TOK_RECV }, 246 { "via", TOK_VIA }, 247 { "fragment", TOK_FRAG }, 248 { "frag", TOK_FRAG }, 249 { "fib", TOK_FIB }, 250 { "ipoptions", TOK_IPOPTS }, 251 { "ipopts", TOK_IPOPTS }, 252 { "iplen", TOK_IPLEN }, 253 { "ipid", TOK_IPID }, 254 { "ipprecedence", TOK_IPPRECEDENCE }, 255 { "iptos", TOK_IPTOS }, 256 { "ipttl", TOK_IPTTL }, 257 { "ipversion", TOK_IPVER }, 258 { "ipver", TOK_IPVER }, 259 { "estab", TOK_ESTAB }, 260 { "established", TOK_ESTAB }, 261 { "setup", TOK_SETUP }, 262 { "tcpdatalen", TOK_TCPDATALEN }, 263 { "tcpflags", TOK_TCPFLAGS }, 264 { "tcpflgs", TOK_TCPFLAGS }, 265 { "tcpoptions", TOK_TCPOPTS }, 266 { "tcpopts", TOK_TCPOPTS }, 267 { "tcpseq", TOK_TCPSEQ }, 268 { "tcpack", TOK_TCPACK }, 269 { "tcpwin", TOK_TCPWIN }, 270 { "icmptype", TOK_ICMPTYPES }, 271 { "icmptypes", TOK_ICMPTYPES }, 272 { "dst-ip", TOK_DSTIP }, 273 { "src-ip", TOK_SRCIP }, 274 { "dst-port", TOK_DSTPORT }, 275 { "src-port", TOK_SRCPORT }, 276 { "proto", TOK_PROTO }, 277 { "MAC", TOK_MAC }, 278 { "mac", TOK_MAC }, 279 { "mac-type", TOK_MACTYPE }, 280 { "verrevpath", TOK_VERREVPATH }, 281 { "versrcreach", TOK_VERSRCREACH }, 282 { "antispoof", TOK_ANTISPOOF }, 283 { "ipsec", TOK_IPSEC }, 284 { "icmp6type", TOK_ICMP6TYPES }, 285 { "icmp6types", TOK_ICMP6TYPES }, 286 { "ext6hdr", TOK_EXT6HDR}, 287 { "flow-id", TOK_FLOWID}, 288 { "ipv6", TOK_IPV6}, 289 { "ip6", TOK_IPV6}, 290 { "ipv4", TOK_IPV4}, 291 { "ip4", TOK_IPV4}, 292 { "dst-ipv6", TOK_DSTIP6}, 293 { "dst-ip6", TOK_DSTIP6}, 294 { "src-ipv6", TOK_SRCIP6}, 295 { "src-ip6", TOK_SRCIP6}, 296 { "//", TOK_COMMENT }, 297 298 { "not", TOK_NOT }, /* pseudo option */ 299 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 300 { "or", TOK_OR }, /* pseudo option */ 301 { "|", /* escape */ TOK_OR }, /* pseudo option */ 302 { "{", TOK_STARTBRACE }, /* pseudo option */ 303 { "(", TOK_STARTBRACE }, /* pseudo option */ 304 { "}", TOK_ENDBRACE }, /* pseudo option */ 305 { ")", TOK_ENDBRACE }, /* pseudo option */ 306 { NULL, 0 } /* terminator */ 307 }; 308 309 /* 310 * The following is used to generate a printable argument for 311 * 64-bit numbers, irrespective of platform alignment and bit size. 312 * Because all the printf in this program use %llu as a format, 313 * we just return an unsigned long long, which is larger than 314 * we need in certain cases, but saves the hassle of using 315 * PRIu64 as a format specifier. 316 * We don't care about inlining, this is not performance critical code. 317 */ 318 unsigned long long 319 align_uint64(const uint64_t *pll) 320 { 321 uint64_t ret; 322 323 bcopy (pll, &ret, sizeof(ret)); 324 return ret; 325 } 326 327 void * 328 safe_calloc(size_t number, size_t size) 329 { 330 void *ret = calloc(number, size); 331 332 if (ret == NULL) 333 err(EX_OSERR, "calloc"); 334 return ret; 335 } 336 337 void * 338 safe_realloc(void *ptr, size_t size) 339 { 340 void *ret = realloc(ptr, size); 341 342 if (ret == NULL) 343 err(EX_OSERR, "realloc"); 344 return ret; 345 } 346 347 /* 348 * conditionally runs the command. 349 */ 350 int 351 do_cmd(int optname, void *optval, uintptr_t optlen) 352 { 353 static int s = -1; /* the socket */ 354 int i; 355 356 if (co.test_only) 357 return 0; 358 359 if (s == -1) 360 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 361 if (s < 0) 362 err(EX_UNAVAILABLE, "socket"); 363 364 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 365 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 366 optname == IP_FW_TABLE_GETSIZE || 367 optname == IP_FW_NAT_GET_CONFIG || 368 optname == IP_FW_NAT_GET_LOG) 369 i = getsockopt(s, IPPROTO_IP, optname, optval, 370 (socklen_t *)optlen); 371 else 372 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 373 return i; 374 } 375 376 /** 377 * match_token takes a table and a string, returns the value associated 378 * with the string (-1 in case of failure). 379 */ 380 int 381 match_token(struct _s_x *table, char *string) 382 { 383 struct _s_x *pt; 384 uint i = strlen(string); 385 386 for (pt = table ; i && pt->s != NULL ; pt++) 387 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 388 return pt->x; 389 return -1; 390 } 391 392 /** 393 * match_value takes a table and a value, returns the string associated 394 * with the value (NULL in case of failure). 395 */ 396 char const * 397 match_value(struct _s_x *p, int value) 398 { 399 for (; p->s != NULL; p++) 400 if (p->x == value) 401 return p->s; 402 return NULL; 403 } 404 405 /* 406 * _substrcmp takes two strings and returns 1 if they do not match, 407 * and 0 if they match exactly or the first string is a sub-string 408 * of the second. A warning is printed to stderr in the case that the 409 * first string is a sub-string of the second. 410 * 411 * This function will be removed in the future through the usual 412 * deprecation process. 413 */ 414 int 415 _substrcmp(const char *str1, const char* str2) 416 { 417 418 if (strncmp(str1, str2, strlen(str1)) != 0) 419 return 1; 420 421 if (strlen(str1) != strlen(str2)) 422 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 423 str1, str2); 424 return 0; 425 } 426 427 /* 428 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 429 * and 0 if they match exactly or the second string is a sub-string 430 * of the first. A warning is printed to stderr in the case that the 431 * first string does not match the third. 432 * 433 * This function exists to warn about the bizzare construction 434 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 435 * for "bytes". The problem is that in addition to accepting "by", 436 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 437 * other string beginning with "by". 438 * 439 * This function will be removed in the future through the usual 440 * deprecation process. 441 */ 442 int 443 _substrcmp2(const char *str1, const char* str2, const char* str3) 444 { 445 446 if (strncmp(str1, str2, strlen(str2)) != 0) 447 return 1; 448 449 if (strcmp(str1, str3) != 0) 450 warnx("DEPRECATED: '%s' matched '%s'", 451 str1, str3); 452 return 0; 453 } 454 455 /* 456 * prints one port, symbolic or numeric 457 */ 458 static void 459 print_port(int proto, uint16_t port) 460 { 461 462 if (proto == IPPROTO_ETHERTYPE) { 463 char const *s; 464 465 if (co.do_resolv && (s = match_value(ether_types, port)) ) 466 printf("%s", s); 467 else 468 printf("0x%04x", port); 469 } else { 470 struct servent *se = NULL; 471 if (co.do_resolv) { 472 struct protoent *pe = getprotobynumber(proto); 473 474 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 475 } 476 if (se) 477 printf("%s", se->s_name); 478 else 479 printf("%d", port); 480 } 481 } 482 483 static struct _s_x _port_name[] = { 484 {"dst-port", O_IP_DSTPORT}, 485 {"src-port", O_IP_SRCPORT}, 486 {"ipid", O_IPID}, 487 {"iplen", O_IPLEN}, 488 {"ipttl", O_IPTTL}, 489 {"mac-type", O_MAC_TYPE}, 490 {"tcpdatalen", O_TCPDATALEN}, 491 {"tagged", O_TAGGED}, 492 {NULL, 0} 493 }; 494 495 /* 496 * Print the values in a list 16-bit items of the types above. 497 * XXX todo: add support for mask. 498 */ 499 static void 500 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 501 { 502 uint16_t *p = cmd->ports; 503 int i; 504 char const *sep; 505 506 if (opcode != 0) { 507 sep = match_value(_port_name, opcode); 508 if (sep == NULL) 509 sep = "???"; 510 printf (" %s", sep); 511 } 512 sep = " "; 513 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 514 printf(sep); 515 print_port(proto, p[0]); 516 if (p[0] != p[1]) { 517 printf("-"); 518 print_port(proto, p[1]); 519 } 520 sep = ","; 521 } 522 } 523 524 /* 525 * Like strtol, but also translates service names into port numbers 526 * for some protocols. 527 * In particular: 528 * proto == -1 disables the protocol check; 529 * proto == IPPROTO_ETHERTYPE looks up an internal table 530 * proto == <some value in /etc/protocols> matches the values there. 531 * Returns *end == s in case the parameter is not found. 532 */ 533 static int 534 strtoport(char *s, char **end, int base, int proto) 535 { 536 char *p, *buf; 537 char *s1; 538 int i; 539 540 *end = s; /* default - not found */ 541 if (*s == '\0') 542 return 0; /* not found */ 543 544 if (isdigit(*s)) 545 return strtol(s, end, base); 546 547 /* 548 * find separator. '\\' escapes the next char. 549 */ 550 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 551 if (*s1 == '\\' && s1[1] != '\0') 552 s1++; 553 554 buf = safe_calloc(s1 - s + 1, 1); 555 556 /* 557 * copy into a buffer skipping backslashes 558 */ 559 for (p = s, i = 0; p != s1 ; p++) 560 if (*p != '\\') 561 buf[i++] = *p; 562 buf[i++] = '\0'; 563 564 if (proto == IPPROTO_ETHERTYPE) { 565 i = match_token(ether_types, buf); 566 free(buf); 567 if (i != -1) { /* found */ 568 *end = s1; 569 return i; 570 } 571 } else { 572 struct protoent *pe = NULL; 573 struct servent *se; 574 575 if (proto != 0) 576 pe = getprotobynumber(proto); 577 setservent(1); 578 se = getservbyname(buf, pe ? pe->p_name : NULL); 579 free(buf); 580 if (se != NULL) { 581 *end = s1; 582 return ntohs(se->s_port); 583 } 584 } 585 return 0; /* not found */ 586 } 587 588 /* 589 * Map between current altq queue id numbers and names. 590 */ 591 static int altq_fetched = 0; 592 static TAILQ_HEAD(, pf_altq) altq_entries = 593 TAILQ_HEAD_INITIALIZER(altq_entries); 594 595 static void 596 altq_set_enabled(int enabled) 597 { 598 int pffd; 599 600 pffd = open("/dev/pf", O_RDWR); 601 if (pffd == -1) 602 err(EX_UNAVAILABLE, 603 "altq support opening pf(4) control device"); 604 if (enabled) { 605 if (ioctl(pffd, DIOCSTARTALTQ) != 0 && errno != EEXIST) 606 err(EX_UNAVAILABLE, "enabling altq"); 607 } else { 608 if (ioctl(pffd, DIOCSTOPALTQ) != 0 && errno != ENOENT) 609 err(EX_UNAVAILABLE, "disabling altq"); 610 } 611 close(pffd); 612 } 613 614 static void 615 altq_fetch(void) 616 { 617 struct pfioc_altq pfioc; 618 struct pf_altq *altq; 619 int pffd; 620 unsigned int mnr; 621 622 if (altq_fetched) 623 return; 624 altq_fetched = 1; 625 pffd = open("/dev/pf", O_RDONLY); 626 if (pffd == -1) { 627 warn("altq support opening pf(4) control device"); 628 return; 629 } 630 bzero(&pfioc, sizeof(pfioc)); 631 if (ioctl(pffd, DIOCGETALTQS, &pfioc) != 0) { 632 warn("altq support getting queue list"); 633 close(pffd); 634 return; 635 } 636 mnr = pfioc.nr; 637 for (pfioc.nr = 0; pfioc.nr < mnr; pfioc.nr++) { 638 if (ioctl(pffd, DIOCGETALTQ, &pfioc) != 0) { 639 if (errno == EBUSY) 640 break; 641 warn("altq support getting queue list"); 642 close(pffd); 643 return; 644 } 645 if (pfioc.altq.qid == 0) 646 continue; 647 altq = safe_calloc(1, sizeof(*altq)); 648 *altq = pfioc.altq; 649 TAILQ_INSERT_TAIL(&altq_entries, altq, entries); 650 } 651 close(pffd); 652 } 653 654 static u_int32_t 655 altq_name_to_qid(const char *name) 656 { 657 struct pf_altq *altq; 658 659 altq_fetch(); 660 TAILQ_FOREACH(altq, &altq_entries, entries) 661 if (strcmp(name, altq->qname) == 0) 662 break; 663 if (altq == NULL) 664 errx(EX_DATAERR, "altq has no queue named `%s'", name); 665 return altq->qid; 666 } 667 668 static const char * 669 altq_qid_to_name(u_int32_t qid) 670 { 671 struct pf_altq *altq; 672 673 altq_fetch(); 674 TAILQ_FOREACH(altq, &altq_entries, entries) 675 if (qid == altq->qid) 676 break; 677 if (altq == NULL) 678 return NULL; 679 return altq->qname; 680 } 681 682 static void 683 fill_altq_qid(u_int32_t *qid, const char *av) 684 { 685 *qid = altq_name_to_qid(av); 686 } 687 688 /* 689 * Fill the body of the command with the list of port ranges. 690 */ 691 static int 692 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 693 { 694 uint16_t a, b, *p = cmd->ports; 695 int i = 0; 696 char *s = av; 697 698 while (*s) { 699 a = strtoport(av, &s, 0, proto); 700 if (s == av) /* empty or invalid argument */ 701 return (0); 702 703 switch (*s) { 704 case '-': /* a range */ 705 av = s + 1; 706 b = strtoport(av, &s, 0, proto); 707 /* Reject expressions like '1-abc' or '1-2-3'. */ 708 if (s == av || (*s != ',' && *s != '\0')) 709 return (0); 710 p[0] = a; 711 p[1] = b; 712 break; 713 case ',': /* comma separated list */ 714 case '\0': 715 p[0] = p[1] = a; 716 break; 717 default: 718 warnx("port list: invalid separator <%c> in <%s>", 719 *s, av); 720 return (0); 721 } 722 723 i++; 724 p += 2; 725 av = s + 1; 726 } 727 if (i > 0) { 728 if (i + 1 > F_LEN_MASK) 729 errx(EX_DATAERR, "too many ports/ranges\n"); 730 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 731 } 732 return (i); 733 } 734 735 static struct _s_x icmpcodes[] = { 736 { "net", ICMP_UNREACH_NET }, 737 { "host", ICMP_UNREACH_HOST }, 738 { "protocol", ICMP_UNREACH_PROTOCOL }, 739 { "port", ICMP_UNREACH_PORT }, 740 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 741 { "srcfail", ICMP_UNREACH_SRCFAIL }, 742 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 743 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 744 { "isolated", ICMP_UNREACH_ISOLATED }, 745 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 746 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 747 { "tosnet", ICMP_UNREACH_TOSNET }, 748 { "toshost", ICMP_UNREACH_TOSHOST }, 749 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 750 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 751 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 752 { NULL, 0 } 753 }; 754 755 static void 756 fill_reject_code(u_short *codep, char *str) 757 { 758 int val; 759 char *s; 760 761 val = strtoul(str, &s, 0); 762 if (s == str || *s != '\0' || val >= 0x100) 763 val = match_token(icmpcodes, str); 764 if (val < 0) 765 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 766 *codep = val; 767 return; 768 } 769 770 static void 771 print_reject_code(uint16_t code) 772 { 773 char const *s = match_value(icmpcodes, code); 774 775 if (s != NULL) 776 printf("unreach %s", s); 777 else 778 printf("unreach %u", code); 779 } 780 781 /* 782 * Returns the number of bits set (from left) in a contiguous bitmask, 783 * or -1 if the mask is not contiguous. 784 * XXX this needs a proper fix. 785 * This effectively works on masks in big-endian (network) format. 786 * when compiled on little endian architectures. 787 * 788 * First bit is bit 7 of the first byte -- note, for MAC addresses, 789 * the first bit on the wire is bit 0 of the first byte. 790 * len is the max length in bits. 791 */ 792 int 793 contigmask(uint8_t *p, int len) 794 { 795 int i, n; 796 797 for (i=0; i<len ; i++) 798 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 799 break; 800 for (n=i+1; n < len; n++) 801 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 802 return -1; /* mask not contiguous */ 803 return i; 804 } 805 806 /* 807 * print flags set/clear in the two bitmasks passed as parameters. 808 * There is a specialized check for f_tcpflags. 809 */ 810 static void 811 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 812 { 813 char const *comma = ""; 814 int i; 815 uint8_t set = cmd->arg1 & 0xff; 816 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 817 818 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 819 printf(" setup"); 820 return; 821 } 822 823 printf(" %s ", name); 824 for (i=0; list[i].x != 0; i++) { 825 if (set & list[i].x) { 826 set &= ~list[i].x; 827 printf("%s%s", comma, list[i].s); 828 comma = ","; 829 } 830 if (clear & list[i].x) { 831 clear &= ~list[i].x; 832 printf("%s!%s", comma, list[i].s); 833 comma = ","; 834 } 835 } 836 } 837 838 /* 839 * Print the ip address contained in a command. 840 */ 841 static void 842 print_ip(ipfw_insn_ip *cmd, char const *s) 843 { 844 struct hostent *he = NULL; 845 int len = F_LEN((ipfw_insn *)cmd); 846 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 847 848 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 849 850 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 851 printf("me"); 852 return; 853 } 854 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 855 cmd->o.opcode == O_IP_DST_LOOKUP) { 856 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 857 if (len == F_INSN_SIZE(ipfw_insn_u32)) 858 printf(",%u", *a); 859 printf(")"); 860 return; 861 } 862 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 863 uint32_t x, *map = (uint32_t *)&(cmd->mask); 864 int i, j; 865 char comma = '{'; 866 867 x = cmd->o.arg1 - 1; 868 x = htonl( ~x ); 869 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 870 printf("%s/%d", inet_ntoa(cmd->addr), 871 contigmask((uint8_t *)&x, 32)); 872 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 873 x &= 0xff; /* base */ 874 /* 875 * Print bits and ranges. 876 * Locate first bit set (i), then locate first bit unset (j). 877 * If we have 3+ consecutive bits set, then print them as a 878 * range, otherwise only print the initial bit and rescan. 879 */ 880 for (i=0; i < cmd->o.arg1; i++) 881 if (map[i/32] & (1<<(i & 31))) { 882 for (j=i+1; j < cmd->o.arg1; j++) 883 if (!(map[ j/32] & (1<<(j & 31)))) 884 break; 885 printf("%c%d", comma, i+x); 886 if (j>i+2) { /* range has at least 3 elements */ 887 printf("-%d", j-1+x); 888 i = j-1; 889 } 890 comma = ','; 891 } 892 printf("}"); 893 return; 894 } 895 /* 896 * len == 2 indicates a single IP, whereas lists of 1 or more 897 * addr/mask pairs have len = (2n+1). We convert len to n so we 898 * use that to count the number of entries. 899 */ 900 for (len = len / 2; len > 0; len--, a += 2) { 901 int mb = /* mask length */ 902 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 903 32 : contigmask((uint8_t *)&(a[1]), 32); 904 if (mb == 32 && co.do_resolv) 905 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 906 if (he != NULL) /* resolved to name */ 907 printf("%s", he->h_name); 908 else if (mb == 0) /* any */ 909 printf("any"); 910 else { /* numeric IP followed by some kind of mask */ 911 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 912 if (mb < 0) 913 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 914 else if (mb < 32) 915 printf("/%d", mb); 916 } 917 if (len > 1) 918 printf(","); 919 } 920 } 921 922 /* 923 * prints a MAC address/mask pair 924 */ 925 static void 926 print_mac(uint8_t *addr, uint8_t *mask) 927 { 928 int l = contigmask(mask, 48); 929 930 if (l == 0) 931 printf(" any"); 932 else { 933 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 934 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 935 if (l == -1) 936 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 937 mask[0], mask[1], mask[2], 938 mask[3], mask[4], mask[5]); 939 else if (l < 48) 940 printf("/%d", l); 941 } 942 } 943 944 static void 945 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 946 { 947 uint8_t type; 948 949 cmd->d[0] = 0; 950 while (*av) { 951 if (*av == ',') 952 av++; 953 954 type = strtoul(av, &av, 0); 955 956 if (*av != ',' && *av != '\0') 957 errx(EX_DATAERR, "invalid ICMP type"); 958 959 if (type > 31) 960 errx(EX_DATAERR, "ICMP type out of range"); 961 962 cmd->d[0] |= 1 << type; 963 } 964 cmd->o.opcode = O_ICMPTYPE; 965 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 966 } 967 968 static void 969 print_icmptypes(ipfw_insn_u32 *cmd) 970 { 971 int i; 972 char sep= ' '; 973 974 printf(" icmptypes"); 975 for (i = 0; i < 32; i++) { 976 if ( (cmd->d[0] & (1 << (i))) == 0) 977 continue; 978 printf("%c%d", sep, i); 979 sep = ','; 980 } 981 } 982 983 /* 984 * show_ipfw() prints the body of an ipfw rule. 985 * Because the standard rule has at least proto src_ip dst_ip, we use 986 * a helper function to produce these entries if not provided explicitly. 987 * The first argument is the list of fields we have, the second is 988 * the list of fields we want to be printed. 989 * 990 * Special cases if we have provided a MAC header: 991 * + if the rule does not contain IP addresses/ports, do not print them; 992 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 993 * 994 * Once we have 'have_options', IP header fields are printed as options. 995 */ 996 #define HAVE_PROTO 0x0001 997 #define HAVE_SRCIP 0x0002 998 #define HAVE_DSTIP 0x0004 999 #define HAVE_PROTO4 0x0008 1000 #define HAVE_PROTO6 0x0010 1001 #define HAVE_OPTIONS 0x8000 1002 1003 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 1004 static void 1005 show_prerequisites(int *flags, int want, int cmd __unused) 1006 { 1007 if (co.comment_only) 1008 return; 1009 if ( (*flags & HAVE_IP) == HAVE_IP) 1010 *flags |= HAVE_OPTIONS; 1011 1012 if ( !(*flags & HAVE_OPTIONS)) { 1013 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 1014 if ( (*flags & HAVE_PROTO4)) 1015 printf(" ip4"); 1016 else if ( (*flags & HAVE_PROTO6)) 1017 printf(" ip6"); 1018 else 1019 printf(" ip"); 1020 } 1021 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 1022 printf(" from any"); 1023 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 1024 printf(" to any"); 1025 } 1026 *flags |= want; 1027 } 1028 1029 static void 1030 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 1031 { 1032 static int twidth = 0; 1033 int l; 1034 ipfw_insn *cmd, *tagptr = NULL; 1035 const char *comment = NULL; /* ptr to comment if we have one */ 1036 int proto = 0; /* default */ 1037 int flags = 0; /* prerequisites */ 1038 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 1039 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 1040 int or_block = 0; /* we are in an or block */ 1041 uint32_t set_disable; 1042 1043 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 1044 1045 if (set_disable & (1 << rule->set)) { /* disabled */ 1046 if (!co.show_sets) 1047 return; 1048 else 1049 printf("# DISABLED "); 1050 } 1051 printf("%05u ", rule->rulenum); 1052 1053 if (pcwidth>0 || bcwidth>0) 1054 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 1055 bcwidth, align_uint64(&rule->bcnt)); 1056 1057 if (co.do_time == 2) 1058 printf("%10u ", rule->timestamp); 1059 else if (co.do_time == 1) { 1060 char timestr[30]; 1061 time_t t = (time_t)0; 1062 1063 if (twidth == 0) { 1064 strcpy(timestr, ctime(&t)); 1065 *strchr(timestr, '\n') = '\0'; 1066 twidth = strlen(timestr); 1067 } 1068 if (rule->timestamp) { 1069 t = _long_to_time(rule->timestamp); 1070 1071 strcpy(timestr, ctime(&t)); 1072 *strchr(timestr, '\n') = '\0'; 1073 printf("%s ", timestr); 1074 } else { 1075 printf("%*s", twidth, " "); 1076 } 1077 } 1078 1079 if (co.show_sets) 1080 printf("set %d ", rule->set); 1081 1082 /* 1083 * print the optional "match probability" 1084 */ 1085 if (rule->cmd_len > 0) { 1086 cmd = rule->cmd ; 1087 if (cmd->opcode == O_PROB) { 1088 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1089 double d = 1.0 * p->d[0]; 1090 1091 d = (d / 0x7fffffff); 1092 printf("prob %f ", d); 1093 } 1094 } 1095 1096 /* 1097 * first print actions 1098 */ 1099 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1100 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1101 switch(cmd->opcode) { 1102 case O_CHECK_STATE: 1103 printf("check-state"); 1104 flags = HAVE_IP; /* avoid printing anything else */ 1105 break; 1106 1107 case O_ACCEPT: 1108 printf("allow"); 1109 break; 1110 1111 case O_COUNT: 1112 printf("count"); 1113 break; 1114 1115 case O_DENY: 1116 printf("deny"); 1117 break; 1118 1119 case O_REJECT: 1120 if (cmd->arg1 == ICMP_REJECT_RST) 1121 printf("reset"); 1122 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1123 printf("reject"); 1124 else 1125 print_reject_code(cmd->arg1); 1126 break; 1127 1128 case O_UNREACH6: 1129 if (cmd->arg1 == ICMP6_UNREACH_RST) 1130 printf("reset6"); 1131 else 1132 print_unreach6_code(cmd->arg1); 1133 break; 1134 1135 case O_SKIPTO: 1136 PRINT_UINT_ARG("skipto ", cmd->arg1); 1137 break; 1138 1139 case O_PIPE: 1140 PRINT_UINT_ARG("pipe ", cmd->arg1); 1141 break; 1142 1143 case O_QUEUE: 1144 PRINT_UINT_ARG("queue ", cmd->arg1); 1145 break; 1146 1147 case O_DIVERT: 1148 PRINT_UINT_ARG("divert ", cmd->arg1); 1149 break; 1150 1151 case O_TEE: 1152 PRINT_UINT_ARG("tee ", cmd->arg1); 1153 break; 1154 1155 case O_NETGRAPH: 1156 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1157 break; 1158 1159 case O_NGTEE: 1160 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1161 break; 1162 1163 case O_FORWARD_IP: 1164 { 1165 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1166 1167 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1168 printf("fwd tablearg"); 1169 } else { 1170 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1171 } 1172 if (s->sa.sin_port) 1173 printf(",%d", s->sa.sin_port); 1174 } 1175 break; 1176 1177 case O_LOG: /* O_LOG is printed last */ 1178 logptr = (ipfw_insn_log *)cmd; 1179 break; 1180 1181 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1182 altqptr = (ipfw_insn_altq *)cmd; 1183 break; 1184 1185 case O_TAG: 1186 tagptr = cmd; 1187 break; 1188 1189 case O_NAT: 1190 PRINT_UINT_ARG("nat ", cmd->arg1); 1191 break; 1192 1193 case O_SETFIB: 1194 PRINT_UINT_ARG("setfib ", cmd->arg1); 1195 break; 1196 1197 default: 1198 printf("** unrecognized action %d len %d ", 1199 cmd->opcode, cmd->len); 1200 } 1201 } 1202 if (logptr) { 1203 if (logptr->max_log > 0) 1204 printf(" log logamount %d", logptr->max_log); 1205 else 1206 printf(" log"); 1207 } 1208 if (altqptr) { 1209 const char *qname; 1210 1211 qname = altq_qid_to_name(altqptr->qid); 1212 if (qname == NULL) 1213 printf(" altq ?<%u>", altqptr->qid); 1214 else 1215 printf(" altq %s", qname); 1216 } 1217 if (tagptr) { 1218 if (tagptr->len & F_NOT) 1219 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1220 else 1221 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1222 } 1223 1224 /* 1225 * then print the body. 1226 */ 1227 for (l = rule->act_ofs, cmd = rule->cmd ; 1228 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1229 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1230 continue; 1231 if (cmd->opcode == O_IP4) { 1232 flags |= HAVE_PROTO4; 1233 break; 1234 } else if (cmd->opcode == O_IP6) { 1235 flags |= HAVE_PROTO6; 1236 break; 1237 } 1238 } 1239 if (rule->_pad & 1) { /* empty rules before options */ 1240 if (!co.do_compact) { 1241 show_prerequisites(&flags, HAVE_PROTO, 0); 1242 printf(" from any to any"); 1243 } 1244 flags |= HAVE_IP | HAVE_OPTIONS; 1245 } 1246 1247 if (co.comment_only) 1248 comment = "..."; 1249 1250 for (l = rule->act_ofs, cmd = rule->cmd ; 1251 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1252 /* useful alias */ 1253 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1254 1255 if (co.comment_only) { 1256 if (cmd->opcode != O_NOP) 1257 continue; 1258 printf(" // %s\n", (char *)(cmd + 1)); 1259 return; 1260 } 1261 1262 show_prerequisites(&flags, 0, cmd->opcode); 1263 1264 switch(cmd->opcode) { 1265 case O_PROB: 1266 break; /* done already */ 1267 1268 case O_PROBE_STATE: 1269 break; /* no need to print anything here */ 1270 1271 case O_IP_SRC: 1272 case O_IP_SRC_LOOKUP: 1273 case O_IP_SRC_MASK: 1274 case O_IP_SRC_ME: 1275 case O_IP_SRC_SET: 1276 show_prerequisites(&flags, HAVE_PROTO, 0); 1277 if (!(flags & HAVE_SRCIP)) 1278 printf(" from"); 1279 if ((cmd->len & F_OR) && !or_block) 1280 printf(" {"); 1281 print_ip((ipfw_insn_ip *)cmd, 1282 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1283 flags |= HAVE_SRCIP; 1284 break; 1285 1286 case O_IP_DST: 1287 case O_IP_DST_LOOKUP: 1288 case O_IP_DST_MASK: 1289 case O_IP_DST_ME: 1290 case O_IP_DST_SET: 1291 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1292 if (!(flags & HAVE_DSTIP)) 1293 printf(" to"); 1294 if ((cmd->len & F_OR) && !or_block) 1295 printf(" {"); 1296 print_ip((ipfw_insn_ip *)cmd, 1297 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1298 flags |= HAVE_DSTIP; 1299 break; 1300 1301 case O_IP6_SRC: 1302 case O_IP6_SRC_MASK: 1303 case O_IP6_SRC_ME: 1304 show_prerequisites(&flags, HAVE_PROTO, 0); 1305 if (!(flags & HAVE_SRCIP)) 1306 printf(" from"); 1307 if ((cmd->len & F_OR) && !or_block) 1308 printf(" {"); 1309 print_ip6((ipfw_insn_ip6 *)cmd, 1310 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1311 flags |= HAVE_SRCIP | HAVE_PROTO; 1312 break; 1313 1314 case O_IP6_DST: 1315 case O_IP6_DST_MASK: 1316 case O_IP6_DST_ME: 1317 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1318 if (!(flags & HAVE_DSTIP)) 1319 printf(" to"); 1320 if ((cmd->len & F_OR) && !or_block) 1321 printf(" {"); 1322 print_ip6((ipfw_insn_ip6 *)cmd, 1323 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1324 flags |= HAVE_DSTIP; 1325 break; 1326 1327 case O_FLOW6ID: 1328 print_flow6id( (ipfw_insn_u32 *) cmd ); 1329 flags |= HAVE_OPTIONS; 1330 break; 1331 1332 case O_IP_DSTPORT: 1333 show_prerequisites(&flags, HAVE_IP, 0); 1334 case O_IP_SRCPORT: 1335 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1336 if ((cmd->len & F_OR) && !or_block) 1337 printf(" {"); 1338 if (cmd->len & F_NOT) 1339 printf(" not"); 1340 print_newports((ipfw_insn_u16 *)cmd, proto, 1341 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1342 break; 1343 1344 case O_PROTO: { 1345 struct protoent *pe = NULL; 1346 1347 if ((cmd->len & F_OR) && !or_block) 1348 printf(" {"); 1349 if (cmd->len & F_NOT) 1350 printf(" not"); 1351 proto = cmd->arg1; 1352 pe = getprotobynumber(cmd->arg1); 1353 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1354 !(flags & HAVE_PROTO)) 1355 show_prerequisites(&flags, 1356 HAVE_IP | HAVE_OPTIONS, 0); 1357 if (flags & HAVE_OPTIONS) 1358 printf(" proto"); 1359 if (pe) 1360 printf(" %s", pe->p_name); 1361 else 1362 printf(" %u", cmd->arg1); 1363 } 1364 flags |= HAVE_PROTO; 1365 break; 1366 1367 default: /*options ... */ 1368 if (!(cmd->len & (F_OR|F_NOT))) 1369 if (((cmd->opcode == O_IP6) && 1370 (flags & HAVE_PROTO6)) || 1371 ((cmd->opcode == O_IP4) && 1372 (flags & HAVE_PROTO4))) 1373 break; 1374 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1375 if ((cmd->len & F_OR) && !or_block) 1376 printf(" {"); 1377 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1378 printf(" not"); 1379 switch(cmd->opcode) { 1380 case O_MACADDR2: { 1381 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1382 1383 printf(" MAC"); 1384 print_mac(m->addr, m->mask); 1385 print_mac(m->addr + 6, m->mask + 6); 1386 } 1387 break; 1388 1389 case O_MAC_TYPE: 1390 print_newports((ipfw_insn_u16 *)cmd, 1391 IPPROTO_ETHERTYPE, cmd->opcode); 1392 break; 1393 1394 1395 case O_FRAG: 1396 printf(" frag"); 1397 break; 1398 1399 case O_FIB: 1400 printf(" fib %u", cmd->arg1 ); 1401 break; 1402 1403 case O_IN: 1404 printf(cmd->len & F_NOT ? " out" : " in"); 1405 break; 1406 1407 case O_DIVERTED: 1408 switch (cmd->arg1) { 1409 case 3: 1410 printf(" diverted"); 1411 break; 1412 case 1: 1413 printf(" diverted-loopback"); 1414 break; 1415 case 2: 1416 printf(" diverted-output"); 1417 break; 1418 default: 1419 printf(" diverted-?<%u>", cmd->arg1); 1420 break; 1421 } 1422 break; 1423 1424 case O_LAYER2: 1425 printf(" layer2"); 1426 break; 1427 case O_XMIT: 1428 case O_RECV: 1429 case O_VIA: 1430 { 1431 char const *s; 1432 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1433 1434 if (cmd->opcode == O_XMIT) 1435 s = "xmit"; 1436 else if (cmd->opcode == O_RECV) 1437 s = "recv"; 1438 else /* if (cmd->opcode == O_VIA) */ 1439 s = "via"; 1440 if (cmdif->name[0] == '\0') 1441 printf(" %s %s", s, 1442 inet_ntoa(cmdif->p.ip)); 1443 else 1444 printf(" %s %s", s, cmdif->name); 1445 1446 break; 1447 } 1448 case O_IPID: 1449 if (F_LEN(cmd) == 1) 1450 printf(" ipid %u", cmd->arg1 ); 1451 else 1452 print_newports((ipfw_insn_u16 *)cmd, 0, 1453 O_IPID); 1454 break; 1455 1456 case O_IPTTL: 1457 if (F_LEN(cmd) == 1) 1458 printf(" ipttl %u", cmd->arg1 ); 1459 else 1460 print_newports((ipfw_insn_u16 *)cmd, 0, 1461 O_IPTTL); 1462 break; 1463 1464 case O_IPVER: 1465 printf(" ipver %u", cmd->arg1 ); 1466 break; 1467 1468 case O_IPPRECEDENCE: 1469 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1470 break; 1471 1472 case O_IPLEN: 1473 if (F_LEN(cmd) == 1) 1474 printf(" iplen %u", cmd->arg1 ); 1475 else 1476 print_newports((ipfw_insn_u16 *)cmd, 0, 1477 O_IPLEN); 1478 break; 1479 1480 case O_IPOPT: 1481 print_flags("ipoptions", cmd, f_ipopts); 1482 break; 1483 1484 case O_IPTOS: 1485 print_flags("iptos", cmd, f_iptos); 1486 break; 1487 1488 case O_ICMPTYPE: 1489 print_icmptypes((ipfw_insn_u32 *)cmd); 1490 break; 1491 1492 case O_ESTAB: 1493 printf(" established"); 1494 break; 1495 1496 case O_TCPDATALEN: 1497 if (F_LEN(cmd) == 1) 1498 printf(" tcpdatalen %u", cmd->arg1 ); 1499 else 1500 print_newports((ipfw_insn_u16 *)cmd, 0, 1501 O_TCPDATALEN); 1502 break; 1503 1504 case O_TCPFLAGS: 1505 print_flags("tcpflags", cmd, f_tcpflags); 1506 break; 1507 1508 case O_TCPOPTS: 1509 print_flags("tcpoptions", cmd, f_tcpopts); 1510 break; 1511 1512 case O_TCPWIN: 1513 printf(" tcpwin %d", ntohs(cmd->arg1)); 1514 break; 1515 1516 case O_TCPACK: 1517 printf(" tcpack %d", ntohl(cmd32->d[0])); 1518 break; 1519 1520 case O_TCPSEQ: 1521 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1522 break; 1523 1524 case O_UID: 1525 { 1526 struct passwd *pwd = getpwuid(cmd32->d[0]); 1527 1528 if (pwd) 1529 printf(" uid %s", pwd->pw_name); 1530 else 1531 printf(" uid %u", cmd32->d[0]); 1532 } 1533 break; 1534 1535 case O_GID: 1536 { 1537 struct group *grp = getgrgid(cmd32->d[0]); 1538 1539 if (grp) 1540 printf(" gid %s", grp->gr_name); 1541 else 1542 printf(" gid %u", cmd32->d[0]); 1543 } 1544 break; 1545 1546 case O_JAIL: 1547 printf(" jail %d", cmd32->d[0]); 1548 break; 1549 1550 case O_VERREVPATH: 1551 printf(" verrevpath"); 1552 break; 1553 1554 case O_VERSRCREACH: 1555 printf(" versrcreach"); 1556 break; 1557 1558 case O_ANTISPOOF: 1559 printf(" antispoof"); 1560 break; 1561 1562 case O_IPSEC: 1563 printf(" ipsec"); 1564 break; 1565 1566 case O_NOP: 1567 comment = (char *)(cmd + 1); 1568 break; 1569 1570 case O_KEEP_STATE: 1571 printf(" keep-state"); 1572 break; 1573 1574 case O_LIMIT: { 1575 struct _s_x *p = limit_masks; 1576 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1577 uint8_t x = c->limit_mask; 1578 char const *comma = " "; 1579 1580 printf(" limit"); 1581 for (; p->x != 0 ; p++) 1582 if ((x & p->x) == p->x) { 1583 x &= ~p->x; 1584 printf("%s%s", comma, p->s); 1585 comma = ","; 1586 } 1587 PRINT_UINT_ARG(" ", c->conn_limit); 1588 break; 1589 } 1590 1591 case O_IP6: 1592 printf(" ip6"); 1593 break; 1594 1595 case O_IP4: 1596 printf(" ip4"); 1597 break; 1598 1599 case O_ICMP6TYPE: 1600 print_icmp6types((ipfw_insn_u32 *)cmd); 1601 break; 1602 1603 case O_EXT_HDR: 1604 print_ext6hdr( (ipfw_insn *) cmd ); 1605 break; 1606 1607 case O_TAGGED: 1608 if (F_LEN(cmd) == 1) 1609 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1610 else 1611 print_newports((ipfw_insn_u16 *)cmd, 0, 1612 O_TAGGED); 1613 break; 1614 1615 default: 1616 printf(" [opcode %d len %d]", 1617 cmd->opcode, cmd->len); 1618 } 1619 } 1620 if (cmd->len & F_OR) { 1621 printf(" or"); 1622 or_block = 1; 1623 } else if (or_block) { 1624 printf(" }"); 1625 or_block = 0; 1626 } 1627 } 1628 show_prerequisites(&flags, HAVE_IP, 0); 1629 if (comment) 1630 printf(" // %s", comment); 1631 printf("\n"); 1632 } 1633 1634 static void 1635 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1636 { 1637 struct protoent *pe; 1638 struct in_addr a; 1639 uint16_t rulenum; 1640 char buf[INET6_ADDRSTRLEN]; 1641 1642 if (!co.do_expired) { 1643 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1644 return; 1645 } 1646 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1647 printf("%05d", rulenum); 1648 if (pcwidth>0 || bcwidth>0) 1649 printf(" %*llu %*llu (%ds)", pcwidth, 1650 align_uint64(&d->pcnt), bcwidth, 1651 align_uint64(&d->bcnt), d->expire); 1652 switch (d->dyn_type) { 1653 case O_LIMIT_PARENT: 1654 printf(" PARENT %d", d->count); 1655 break; 1656 case O_LIMIT: 1657 printf(" LIMIT"); 1658 break; 1659 case O_KEEP_STATE: /* bidir, no mask */ 1660 printf(" STATE"); 1661 break; 1662 } 1663 1664 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1665 printf(" %s", pe->p_name); 1666 else 1667 printf(" proto %u", d->id.proto); 1668 1669 if (d->id.addr_type == 4) { 1670 a.s_addr = htonl(d->id.src_ip); 1671 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1672 1673 a.s_addr = htonl(d->id.dst_ip); 1674 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1675 } else if (d->id.addr_type == 6) { 1676 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1677 sizeof(buf)), d->id.src_port); 1678 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1679 sizeof(buf)), d->id.dst_port); 1680 } else 1681 printf(" UNKNOWN <-> UNKNOWN\n"); 1682 1683 printf("\n"); 1684 } 1685 1686 /* 1687 * This one handles all set-related commands 1688 * ipfw set { show | enable | disable } 1689 * ipfw set swap X Y 1690 * ipfw set move X to Y 1691 * ipfw set move rule X to Y 1692 */ 1693 void 1694 ipfw_sets_handler(int ac, char *av[]) 1695 { 1696 uint32_t set_disable, masks[2]; 1697 int i, nbytes; 1698 uint16_t rulenum; 1699 uint8_t cmd, new_set; 1700 1701 ac--; 1702 av++; 1703 1704 if (!ac) 1705 errx(EX_USAGE, "set needs command"); 1706 if (_substrcmp(*av, "show") == 0) { 1707 void *data; 1708 char const *msg; 1709 1710 nbytes = sizeof(struct ip_fw); 1711 data = safe_calloc(1, nbytes); 1712 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1713 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1714 bcopy(&((struct ip_fw *)data)->next_rule, 1715 &set_disable, sizeof(set_disable)); 1716 1717 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1718 if ((set_disable & (1<<i))) { 1719 printf("%s %d", msg, i); 1720 msg = ""; 1721 } 1722 msg = (set_disable) ? " enable" : "enable"; 1723 for (i = 0; i < RESVD_SET; i++) 1724 if (!(set_disable & (1<<i))) { 1725 printf("%s %d", msg, i); 1726 msg = ""; 1727 } 1728 printf("\n"); 1729 } else if (_substrcmp(*av, "swap") == 0) { 1730 ac--; av++; 1731 if (ac != 2) 1732 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1733 rulenum = atoi(av[0]); 1734 new_set = atoi(av[1]); 1735 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1736 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1737 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1738 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1739 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1740 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1741 } else if (_substrcmp(*av, "move") == 0) { 1742 ac--; av++; 1743 if (ac && _substrcmp(*av, "rule") == 0) { 1744 cmd = 2; 1745 ac--; av++; 1746 } else 1747 cmd = 3; 1748 if (ac != 3 || _substrcmp(av[1], "to") != 0) 1749 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1750 rulenum = atoi(av[0]); 1751 new_set = atoi(av[2]); 1752 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1753 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1754 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1755 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1756 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1757 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1758 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1759 } else if (_substrcmp(*av, "disable") == 0 || 1760 _substrcmp(*av, "enable") == 0 ) { 1761 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1762 1763 ac--; av++; 1764 masks[0] = masks[1] = 0; 1765 1766 while (ac) { 1767 if (isdigit(**av)) { 1768 i = atoi(*av); 1769 if (i < 0 || i > RESVD_SET) 1770 errx(EX_DATAERR, 1771 "invalid set number %d\n", i); 1772 masks[which] |= (1<<i); 1773 } else if (_substrcmp(*av, "disable") == 0) 1774 which = 0; 1775 else if (_substrcmp(*av, "enable") == 0) 1776 which = 1; 1777 else 1778 errx(EX_DATAERR, 1779 "invalid set command %s\n", *av); 1780 av++; ac--; 1781 } 1782 if ( (masks[0] & masks[1]) != 0 ) 1783 errx(EX_DATAERR, 1784 "cannot enable and disable the same set\n"); 1785 1786 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1787 if (i) 1788 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1789 } else 1790 errx(EX_USAGE, "invalid set command %s\n", *av); 1791 } 1792 1793 void 1794 ipfw_sysctl_handler(int ac, char *av[], int which) 1795 { 1796 ac--; 1797 av++; 1798 1799 if (ac == 0) { 1800 warnx("missing keyword to enable/disable\n"); 1801 } else if (_substrcmp(*av, "firewall") == 0) { 1802 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1803 &which, sizeof(which)); 1804 } else if (_substrcmp(*av, "one_pass") == 0) { 1805 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1806 &which, sizeof(which)); 1807 } else if (_substrcmp(*av, "debug") == 0) { 1808 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1809 &which, sizeof(which)); 1810 } else if (_substrcmp(*av, "verbose") == 0) { 1811 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1812 &which, sizeof(which)); 1813 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1814 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1815 &which, sizeof(which)); 1816 } else if (_substrcmp(*av, "altq") == 0) { 1817 altq_set_enabled(which); 1818 } else { 1819 warnx("unrecognize enable/disable keyword: %s\n", *av); 1820 } 1821 } 1822 1823 void 1824 ipfw_list(int ac, char *av[], int show_counters) 1825 { 1826 struct ip_fw *r; 1827 ipfw_dyn_rule *dynrules, *d; 1828 1829 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1830 char *lim; 1831 void *data = NULL; 1832 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1833 int exitval = EX_OK; 1834 int lac; 1835 char **lav; 1836 u_long rnum, last; 1837 char *endptr; 1838 int seen = 0; 1839 uint8_t set; 1840 1841 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1842 int nalloc = 1024; /* start somewhere... */ 1843 1844 last = 0; 1845 1846 if (co.test_only) { 1847 fprintf(stderr, "Testing only, list disabled\n"); 1848 return; 1849 } 1850 1851 ac--; 1852 av++; 1853 1854 /* get rules or pipes from kernel, resizing array as necessary */ 1855 nbytes = nalloc; 1856 1857 while (nbytes >= nalloc) { 1858 nalloc = nalloc * 2 + 200; 1859 nbytes = nalloc; 1860 data = safe_realloc(data, nbytes); 1861 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1862 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1863 co.do_pipe ? "DUMMYNET" : "FW"); 1864 } 1865 1866 if (co.do_pipe) { 1867 ipfw_list_pipes(data, nbytes, ac, av); 1868 goto done; 1869 } 1870 1871 /* 1872 * Count static rules. They have variable size so we 1873 * need to scan the list to count them. 1874 */ 1875 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1876 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1877 ++nstat, r = NEXT(r) ) 1878 ; /* nothing */ 1879 1880 /* 1881 * Count dynamic rules. This is easier as they have 1882 * fixed size. 1883 */ 1884 r = NEXT(r); 1885 dynrules = (ipfw_dyn_rule *)r ; 1886 n = (char *)r - (char *)data; 1887 ndyn = (nbytes - n) / sizeof *dynrules; 1888 1889 /* if showing stats, figure out column widths ahead of time */ 1890 bcwidth = pcwidth = 0; 1891 if (show_counters) { 1892 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1893 /* skip rules from another set */ 1894 if (co.use_set && r->set != co.use_set - 1) 1895 continue; 1896 1897 /* packet counter */ 1898 width = snprintf(NULL, 0, "%llu", 1899 align_uint64(&r->pcnt)); 1900 if (width > pcwidth) 1901 pcwidth = width; 1902 1903 /* byte counter */ 1904 width = snprintf(NULL, 0, "%llu", 1905 align_uint64(&r->bcnt)); 1906 if (width > bcwidth) 1907 bcwidth = width; 1908 } 1909 } 1910 if (co.do_dynamic && ndyn) { 1911 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1912 if (co.use_set) { 1913 /* skip rules from another set */ 1914 bcopy((char *)&d->rule + sizeof(uint16_t), 1915 &set, sizeof(uint8_t)); 1916 if (set != co.use_set - 1) 1917 continue; 1918 } 1919 width = snprintf(NULL, 0, "%llu", 1920 align_uint64(&d->pcnt)); 1921 if (width > pcwidth) 1922 pcwidth = width; 1923 1924 width = snprintf(NULL, 0, "%llu", 1925 align_uint64(&d->bcnt)); 1926 if (width > bcwidth) 1927 bcwidth = width; 1928 } 1929 } 1930 /* if no rule numbers were specified, list all rules */ 1931 if (ac == 0) { 1932 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1933 if (co.use_set && r->set != co.use_set - 1) 1934 continue; 1935 show_ipfw(r, pcwidth, bcwidth); 1936 } 1937 1938 if (co.do_dynamic && ndyn) { 1939 printf("## Dynamic rules (%d):\n", ndyn); 1940 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1941 if (co.use_set) { 1942 bcopy((char *)&d->rule + sizeof(uint16_t), 1943 &set, sizeof(uint8_t)); 1944 if (set != co.use_set - 1) 1945 continue; 1946 } 1947 show_dyn_ipfw(d, pcwidth, bcwidth); 1948 } 1949 } 1950 goto done; 1951 } 1952 1953 /* display specific rules requested on command line */ 1954 1955 for (lac = ac, lav = av; lac != 0; lac--) { 1956 /* convert command line rule # */ 1957 last = rnum = strtoul(*lav++, &endptr, 10); 1958 if (*endptr == '-') 1959 last = strtoul(endptr+1, &endptr, 10); 1960 if (*endptr) { 1961 exitval = EX_USAGE; 1962 warnx("invalid rule number: %s", *(lav - 1)); 1963 continue; 1964 } 1965 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1966 if (r->rulenum > last) 1967 break; 1968 if (co.use_set && r->set != co.use_set - 1) 1969 continue; 1970 if (r->rulenum >= rnum && r->rulenum <= last) { 1971 show_ipfw(r, pcwidth, bcwidth); 1972 seen = 1; 1973 } 1974 } 1975 if (!seen) { 1976 /* give precedence to other error(s) */ 1977 if (exitval == EX_OK) 1978 exitval = EX_UNAVAILABLE; 1979 warnx("rule %lu does not exist", rnum); 1980 } 1981 } 1982 1983 if (co.do_dynamic && ndyn) { 1984 printf("## Dynamic rules:\n"); 1985 for (lac = ac, lav = av; lac != 0; lac--) { 1986 last = rnum = strtoul(*lav++, &endptr, 10); 1987 if (*endptr == '-') 1988 last = strtoul(endptr+1, &endptr, 10); 1989 if (*endptr) 1990 /* already warned */ 1991 continue; 1992 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1993 uint16_t rulenum; 1994 1995 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1996 if (rulenum > rnum) 1997 break; 1998 if (co.use_set) { 1999 bcopy((char *)&d->rule + sizeof(uint16_t), 2000 &set, sizeof(uint8_t)); 2001 if (set != co.use_set - 1) 2002 continue; 2003 } 2004 if (r->rulenum >= rnum && r->rulenum <= last) 2005 show_dyn_ipfw(d, pcwidth, bcwidth); 2006 } 2007 } 2008 } 2009 2010 ac = 0; 2011 2012 done: 2013 free(data); 2014 2015 if (exitval != EX_OK) 2016 exit(exitval); 2017 #undef NEXT 2018 } 2019 2020 static int 2021 lookup_host (char *host, struct in_addr *ipaddr) 2022 { 2023 struct hostent *he; 2024 2025 if (!inet_aton(host, ipaddr)) { 2026 if ((he = gethostbyname(host)) == NULL) 2027 return(-1); 2028 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 2029 } 2030 return(0); 2031 } 2032 2033 /* 2034 * fills the addr and mask fields in the instruction as appropriate from av. 2035 * Update length as appropriate. 2036 * The following formats are allowed: 2037 * me returns O_IP_*_ME 2038 * 1.2.3.4 single IP address 2039 * 1.2.3.4:5.6.7.8 address:mask 2040 * 1.2.3.4/24 address/mask 2041 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 2042 * We can have multiple comma-separated address/mask entries. 2043 */ 2044 static void 2045 fill_ip(ipfw_insn_ip *cmd, char *av) 2046 { 2047 int len = 0; 2048 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2049 2050 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 2051 2052 if (_substrcmp(av, "any") == 0) 2053 return; 2054 2055 if (_substrcmp(av, "me") == 0) { 2056 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2057 return; 2058 } 2059 2060 if (strncmp(av, "table(", 6) == 0) { 2061 char *p = strchr(av + 6, ','); 2062 2063 if (p) 2064 *p++ = '\0'; 2065 cmd->o.opcode = O_IP_DST_LOOKUP; 2066 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 2067 if (p) { 2068 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2069 d[0] = strtoul(p, NULL, 0); 2070 } else 2071 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2072 return; 2073 } 2074 2075 while (av) { 2076 /* 2077 * After the address we can have '/' or ':' indicating a mask, 2078 * ',' indicating another address follows, '{' indicating a 2079 * set of addresses of unspecified size. 2080 */ 2081 char *t = NULL, *p = strpbrk(av, "/:,{"); 2082 int masklen; 2083 char md, nd = '\0'; 2084 2085 if (p) { 2086 md = *p; 2087 *p++ = '\0'; 2088 if ((t = strpbrk(p, ",{")) != NULL) { 2089 nd = *t; 2090 *t = '\0'; 2091 } 2092 } else 2093 md = '\0'; 2094 2095 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2096 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2097 switch (md) { 2098 case ':': 2099 if (!inet_aton(p, (struct in_addr *)&d[1])) 2100 errx(EX_DATAERR, "bad netmask ``%s''", p); 2101 break; 2102 case '/': 2103 masklen = atoi(p); 2104 if (masklen == 0) 2105 d[1] = htonl(0); /* mask */ 2106 else if (masklen > 32) 2107 errx(EX_DATAERR, "bad width ``%s''", p); 2108 else 2109 d[1] = htonl(~0 << (32 - masklen)); 2110 break; 2111 case '{': /* no mask, assume /24 and put back the '{' */ 2112 d[1] = htonl(~0 << (32 - 24)); 2113 *(--p) = md; 2114 break; 2115 2116 case ',': /* single address plus continuation */ 2117 *(--p) = md; 2118 /* FALLTHROUGH */ 2119 case 0: /* initialization value */ 2120 default: 2121 d[1] = htonl(~0); /* force /32 */ 2122 break; 2123 } 2124 d[0] &= d[1]; /* mask base address with mask */ 2125 if (t) 2126 *t = nd; 2127 /* find next separator */ 2128 if (p) 2129 p = strpbrk(p, ",{"); 2130 if (p && *p == '{') { 2131 /* 2132 * We have a set of addresses. They are stored as follows: 2133 * arg1 is the set size (powers of 2, 2..256) 2134 * addr is the base address IN HOST FORMAT 2135 * mask.. is an array of arg1 bits (rounded up to 2136 * the next multiple of 32) with bits set 2137 * for each host in the map. 2138 */ 2139 uint32_t *map = (uint32_t *)&cmd->mask; 2140 int low, high; 2141 int i = contigmask((uint8_t *)&(d[1]), 32); 2142 2143 if (len > 0) 2144 errx(EX_DATAERR, "address set cannot be in a list"); 2145 if (i < 24 || i > 31) 2146 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2147 cmd->o.arg1 = 1<<(32-i); /* map length */ 2148 d[0] = ntohl(d[0]); /* base addr in host format */ 2149 cmd->o.opcode = O_IP_DST_SET; /* default */ 2150 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2151 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2152 map[i] = 0; /* clear map */ 2153 2154 av = p + 1; 2155 low = d[0] & 0xff; 2156 high = low + cmd->o.arg1 - 1; 2157 /* 2158 * Here, i stores the previous value when we specify a range 2159 * of addresses within a mask, e.g. 45-63. i = -1 means we 2160 * have no previous value. 2161 */ 2162 i = -1; /* previous value in a range */ 2163 while (isdigit(*av)) { 2164 char *s; 2165 int a = strtol(av, &s, 0); 2166 2167 if (s == av) { /* no parameter */ 2168 if (*av != '}') 2169 errx(EX_DATAERR, "set not closed\n"); 2170 if (i != -1) 2171 errx(EX_DATAERR, "incomplete range %d-", i); 2172 break; 2173 } 2174 if (a < low || a > high) 2175 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2176 a, low, high); 2177 a -= low; 2178 if (i == -1) /* no previous in range */ 2179 i = a; 2180 else { /* check that range is valid */ 2181 if (i > a) 2182 errx(EX_DATAERR, "invalid range %d-%d", 2183 i+low, a+low); 2184 if (*s == '-') 2185 errx(EX_DATAERR, "double '-' in range"); 2186 } 2187 for (; i <= a; i++) 2188 map[i/32] |= 1<<(i & 31); 2189 i = -1; 2190 if (*s == '-') 2191 i = a; 2192 else if (*s == '}') 2193 break; 2194 av = s+1; 2195 } 2196 return; 2197 } 2198 av = p; 2199 if (av) /* then *av must be a ',' */ 2200 av++; 2201 2202 /* Check this entry */ 2203 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2204 /* 2205 * 'any' turns the entire list into a NOP. 2206 * 'not any' never matches, so it is removed from the 2207 * list unless it is the only item, in which case we 2208 * report an error. 2209 */ 2210 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2211 if (av == NULL && len == 0) /* only this entry */ 2212 errx(EX_DATAERR, "not any never matches"); 2213 } 2214 /* else do nothing and skip this entry */ 2215 return; 2216 } 2217 /* A single IP can be stored in an optimized format */ 2218 if (d[1] == ~0 && av == NULL && len == 0) { 2219 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2220 return; 2221 } 2222 len += 2; /* two words... */ 2223 d += 2; 2224 } /* end while */ 2225 if (len + 1 > F_LEN_MASK) 2226 errx(EX_DATAERR, "address list too long"); 2227 cmd->o.len |= len+1; 2228 } 2229 2230 2231 /* n2mask sets n bits of the mask */ 2232 void 2233 n2mask(struct in6_addr *mask, int n) 2234 { 2235 static int minimask[9] = 2236 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2237 u_char *p; 2238 2239 memset(mask, 0, sizeof(struct in6_addr)); 2240 p = (u_char *) mask; 2241 for (; n > 0; p++, n -= 8) { 2242 if (n >= 8) 2243 *p = 0xff; 2244 else 2245 *p = minimask[n]; 2246 } 2247 return; 2248 } 2249 2250 2251 /* 2252 * helper function to process a set of flags and set bits in the 2253 * appropriate masks. 2254 */ 2255 static void 2256 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2257 struct _s_x *flags, char *p) 2258 { 2259 uint8_t set=0, clear=0; 2260 2261 while (p && *p) { 2262 char *q; /* points to the separator */ 2263 int val; 2264 uint8_t *which; /* mask we are working on */ 2265 2266 if (*p == '!') { 2267 p++; 2268 which = &clear; 2269 } else 2270 which = &set; 2271 q = strchr(p, ','); 2272 if (q) 2273 *q++ = '\0'; 2274 val = match_token(flags, p); 2275 if (val <= 0) 2276 errx(EX_DATAERR, "invalid flag %s", p); 2277 *which |= (uint8_t)val; 2278 p = q; 2279 } 2280 cmd->opcode = opcode; 2281 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2282 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2283 } 2284 2285 2286 void 2287 ipfw_delete(int ac, char *av[]) 2288 { 2289 uint32_t rulenum; 2290 int i; 2291 int exitval = EX_OK; 2292 int do_set = 0; 2293 2294 2295 av++; ac--; 2296 NEED1("missing rule specification"); 2297 if (ac > 0 && _substrcmp(*av, "set") == 0) { 2298 /* Do not allow using the following syntax: 2299 * ipfw set N delete set M 2300 */ 2301 if (co.use_set) 2302 errx(EX_DATAERR, "invalid syntax"); 2303 do_set = 1; /* delete set */ 2304 ac--; av++; 2305 } 2306 2307 /* Rule number */ 2308 while (ac && isdigit(**av)) { 2309 i = atoi(*av); av++; ac--; 2310 if (co.do_nat) { 2311 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2312 if (exitval) { 2313 exitval = EX_UNAVAILABLE; 2314 warn("rule %u not available", i); 2315 } 2316 } else if (co.do_pipe) { 2317 exitval = ipfw_delete_pipe(co.do_pipe, i); 2318 } else { 2319 if (co.use_set) 2320 rulenum = (i & 0xffff) | (5 << 24) | 2321 ((co.use_set - 1) << 16); 2322 else 2323 rulenum = (i & 0xffff) | (do_set << 24); 2324 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2325 if (i) { 2326 exitval = EX_UNAVAILABLE; 2327 warn("rule %u: setsockopt(IP_FW_DEL)", 2328 rulenum); 2329 } 2330 } 2331 } 2332 if (exitval != EX_OK) 2333 exit(exitval); 2334 } 2335 2336 2337 /* 2338 * fill the interface structure. We do not check the name as we can 2339 * create interfaces dynamically, so checking them at insert time 2340 * makes relatively little sense. 2341 * Interface names containing '*', '?', or '[' are assumed to be shell 2342 * patterns which match interfaces. 2343 */ 2344 static void 2345 fill_iface(ipfw_insn_if *cmd, char *arg) 2346 { 2347 cmd->name[0] = '\0'; 2348 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2349 2350 /* Parse the interface or address */ 2351 if (strcmp(arg, "any") == 0) 2352 cmd->o.len = 0; /* effectively ignore this command */ 2353 else if (!isdigit(*arg)) { 2354 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2355 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2356 } else if (!inet_aton(arg, &cmd->p.ip)) 2357 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2358 } 2359 2360 static void 2361 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2362 { 2363 int i, l; 2364 char *ap, *ptr, *optr; 2365 struct ether_addr *mac; 2366 const char *macset = "0123456789abcdefABCDEF:"; 2367 2368 if (strcmp(p, "any") == 0) { 2369 for (i = 0; i < ETHER_ADDR_LEN; i++) 2370 addr[i] = mask[i] = 0; 2371 return; 2372 } 2373 2374 optr = ptr = strdup(p); 2375 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2376 l = strlen(ap); 2377 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2378 errx(EX_DATAERR, "Incorrect MAC address"); 2379 bcopy(mac, addr, ETHER_ADDR_LEN); 2380 } else 2381 errx(EX_DATAERR, "Incorrect MAC address"); 2382 2383 if (ptr != NULL) { /* we have mask? */ 2384 if (p[ptr - optr - 1] == '/') { /* mask len */ 2385 l = strtol(ptr, &ap, 10); 2386 if (*ap != 0 || l > ETHER_ADDR_LEN * 8 || l < 0) 2387 errx(EX_DATAERR, "Incorrect mask length"); 2388 for (i = 0; l > 0 && i < ETHER_ADDR_LEN; l -= 8, i++) 2389 mask[i] = (l >= 8) ? 0xff: (~0) << (8 - l); 2390 } else { /* mask */ 2391 l = strlen(ptr); 2392 if (strspn(ptr, macset) != l || 2393 (mac = ether_aton(ptr)) == NULL) 2394 errx(EX_DATAERR, "Incorrect mask"); 2395 bcopy(mac, mask, ETHER_ADDR_LEN); 2396 } 2397 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2398 for (i = 0; i < ETHER_ADDR_LEN; i++) 2399 mask[i] = 0xff; 2400 } 2401 for (i = 0; i < ETHER_ADDR_LEN; i++) 2402 addr[i] &= mask[i]; 2403 2404 free(optr); 2405 } 2406 2407 /* 2408 * helper function, updates the pointer to cmd with the length 2409 * of the current command, and also cleans up the first word of 2410 * the new command in case it has been clobbered before. 2411 */ 2412 static ipfw_insn * 2413 next_cmd(ipfw_insn *cmd) 2414 { 2415 cmd += F_LEN(cmd); 2416 bzero(cmd, sizeof(*cmd)); 2417 return cmd; 2418 } 2419 2420 /* 2421 * Takes arguments and copies them into a comment 2422 */ 2423 static void 2424 fill_comment(ipfw_insn *cmd, int ac, char **av) 2425 { 2426 int i, l; 2427 char *p = (char *)(cmd + 1); 2428 2429 cmd->opcode = O_NOP; 2430 cmd->len = (cmd->len & (F_NOT | F_OR)); 2431 2432 /* Compute length of comment string. */ 2433 for (i = 0, l = 0; i < ac; i++) 2434 l += strlen(av[i]) + 1; 2435 if (l == 0) 2436 return; 2437 if (l > 84) 2438 errx(EX_DATAERR, 2439 "comment too long (max 80 chars)"); 2440 l = 1 + (l+3)/4; 2441 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2442 for (i = 0; i < ac; i++) { 2443 strcpy(p, av[i]); 2444 p += strlen(av[i]); 2445 *p++ = ' '; 2446 } 2447 *(--p) = '\0'; 2448 } 2449 2450 /* 2451 * A function to fill simple commands of size 1. 2452 * Existing flags are preserved. 2453 */ 2454 static void 2455 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2456 { 2457 cmd->opcode = opcode; 2458 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2459 cmd->arg1 = arg; 2460 } 2461 2462 /* 2463 * Fetch and add the MAC address and type, with masks. This generates one or 2464 * two microinstructions, and returns the pointer to the last one. 2465 */ 2466 static ipfw_insn * 2467 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2468 { 2469 ipfw_insn_mac *mac; 2470 2471 if (ac < 2) 2472 errx(EX_DATAERR, "MAC dst src"); 2473 2474 cmd->opcode = O_MACADDR2; 2475 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2476 2477 mac = (ipfw_insn_mac *)cmd; 2478 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2479 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2480 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2481 return cmd; 2482 } 2483 2484 static ipfw_insn * 2485 add_mactype(ipfw_insn *cmd, int ac, char *av) 2486 { 2487 if (ac < 1) 2488 errx(EX_DATAERR, "missing MAC type"); 2489 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2490 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2491 cmd->opcode = O_MAC_TYPE; 2492 return cmd; 2493 } else 2494 return NULL; 2495 } 2496 2497 static ipfw_insn * 2498 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2499 { 2500 struct protoent *pe; 2501 char *ep; 2502 int proto; 2503 2504 proto = strtol(av, &ep, 10); 2505 if (*ep != '\0' || proto <= 0) { 2506 if ((pe = getprotobyname(av)) == NULL) 2507 return NULL; 2508 proto = pe->p_proto; 2509 } 2510 2511 fill_cmd(cmd, O_PROTO, 0, proto); 2512 *protop = proto; 2513 return cmd; 2514 } 2515 2516 static ipfw_insn * 2517 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2518 { 2519 u_char proto = IPPROTO_IP; 2520 2521 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2522 ; /* do not set O_IP4 nor O_IP6 */ 2523 else if (strcmp(av, "ip4") == 0) 2524 /* explicit "just IPv4" rule */ 2525 fill_cmd(cmd, O_IP4, 0, 0); 2526 else if (strcmp(av, "ip6") == 0) { 2527 /* explicit "just IPv6" rule */ 2528 proto = IPPROTO_IPV6; 2529 fill_cmd(cmd, O_IP6, 0, 0); 2530 } else 2531 return add_proto0(cmd, av, protop); 2532 2533 *protop = proto; 2534 return cmd; 2535 } 2536 2537 static ipfw_insn * 2538 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2539 { 2540 u_char proto = IPPROTO_IP; 2541 2542 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2543 ; /* do not set O_IP4 nor O_IP6 */ 2544 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2545 /* explicit "just IPv4" rule */ 2546 fill_cmd(cmd, O_IP4, 0, 0); 2547 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2548 /* explicit "just IPv6" rule */ 2549 proto = IPPROTO_IPV6; 2550 fill_cmd(cmd, O_IP6, 0, 0); 2551 } else 2552 return add_proto0(cmd, av, protop); 2553 2554 *protop = proto; 2555 return cmd; 2556 } 2557 2558 static ipfw_insn * 2559 add_srcip(ipfw_insn *cmd, char *av) 2560 { 2561 fill_ip((ipfw_insn_ip *)cmd, av); 2562 if (cmd->opcode == O_IP_DST_SET) /* set */ 2563 cmd->opcode = O_IP_SRC_SET; 2564 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2565 cmd->opcode = O_IP_SRC_LOOKUP; 2566 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2567 cmd->opcode = O_IP_SRC_ME; 2568 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2569 cmd->opcode = O_IP_SRC; 2570 else /* addr/mask */ 2571 cmd->opcode = O_IP_SRC_MASK; 2572 return cmd; 2573 } 2574 2575 static ipfw_insn * 2576 add_dstip(ipfw_insn *cmd, char *av) 2577 { 2578 fill_ip((ipfw_insn_ip *)cmd, av); 2579 if (cmd->opcode == O_IP_DST_SET) /* set */ 2580 ; 2581 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2582 ; 2583 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2584 cmd->opcode = O_IP_DST_ME; 2585 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2586 cmd->opcode = O_IP_DST; 2587 else /* addr/mask */ 2588 cmd->opcode = O_IP_DST_MASK; 2589 return cmd; 2590 } 2591 2592 static ipfw_insn * 2593 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2594 { 2595 if (_substrcmp(av, "any") == 0) { 2596 return NULL; 2597 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2598 /* XXX todo: check that we have a protocol with ports */ 2599 cmd->opcode = opcode; 2600 return cmd; 2601 } 2602 return NULL; 2603 } 2604 2605 static ipfw_insn * 2606 add_src(ipfw_insn *cmd, char *av, u_char proto) 2607 { 2608 struct in6_addr a; 2609 char *host, *ch; 2610 ipfw_insn *ret = NULL; 2611 2612 if ((host = strdup(av)) == NULL) 2613 return NULL; 2614 if ((ch = strrchr(host, '/')) != NULL) 2615 *ch = '\0'; 2616 2617 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2618 inet_pton(AF_INET6, host, &a)) 2619 ret = add_srcip6(cmd, av); 2620 /* XXX: should check for IPv4, not !IPv6 */ 2621 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2622 !inet_pton(AF_INET6, host, &a))) 2623 ret = add_srcip(cmd, av); 2624 if (ret == NULL && strcmp(av, "any") != 0) 2625 ret = cmd; 2626 2627 free(host); 2628 return ret; 2629 } 2630 2631 static ipfw_insn * 2632 add_dst(ipfw_insn *cmd, char *av, u_char proto) 2633 { 2634 struct in6_addr a; 2635 char *host, *ch; 2636 ipfw_insn *ret = NULL; 2637 2638 if ((host = strdup(av)) == NULL) 2639 return NULL; 2640 if ((ch = strrchr(host, '/')) != NULL) 2641 *ch = '\0'; 2642 2643 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2644 inet_pton(AF_INET6, host, &a)) 2645 ret = add_dstip6(cmd, av); 2646 /* XXX: should check for IPv4, not !IPv6 */ 2647 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2648 !inet_pton(AF_INET6, host, &a))) 2649 ret = add_dstip(cmd, av); 2650 if (ret == NULL && strcmp(av, "any") != 0) 2651 ret = cmd; 2652 2653 free(host); 2654 return ret; 2655 } 2656 2657 /* 2658 * Parse arguments and assemble the microinstructions which make up a rule. 2659 * Rules are added into the 'rulebuf' and then copied in the correct order 2660 * into the actual rule. 2661 * 2662 * The syntax for a rule starts with the action, followed by 2663 * optional action parameters, and the various match patterns. 2664 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2665 * (generated if the rule includes a keep-state option), then the 2666 * various match patterns, log/altq actions, and the actual action. 2667 * 2668 */ 2669 void 2670 ipfw_add(int ac, char *av[]) 2671 { 2672 /* 2673 * rules are added into the 'rulebuf' and then copied in 2674 * the correct order into the actual rule. 2675 * Some things that need to go out of order (prob, action etc.) 2676 * go into actbuf[]. 2677 */ 2678 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2679 2680 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2681 ipfw_insn *first_cmd; /* first match pattern */ 2682 2683 struct ip_fw *rule; 2684 2685 /* 2686 * various flags used to record that we entered some fields. 2687 */ 2688 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2689 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2690 size_t len; 2691 2692 int i; 2693 2694 int open_par = 0; /* open parenthesis ( */ 2695 2696 /* proto is here because it is used to fetch ports */ 2697 u_char proto = IPPROTO_IP; /* default protocol */ 2698 2699 double match_prob = 1; /* match probability, default is always match */ 2700 2701 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2702 bzero(cmdbuf, sizeof(cmdbuf)); 2703 bzero(rulebuf, sizeof(rulebuf)); 2704 2705 rule = (struct ip_fw *)rulebuf; 2706 cmd = (ipfw_insn *)cmdbuf; 2707 action = (ipfw_insn *)actbuf; 2708 2709 av++; ac--; 2710 2711 /* [rule N] -- Rule number optional */ 2712 if (ac && isdigit(**av)) { 2713 rule->rulenum = atoi(*av); 2714 av++; 2715 ac--; 2716 } 2717 2718 /* [set N] -- set number (0..RESVD_SET), optional */ 2719 if (ac > 1 && _substrcmp(*av, "set") == 0) { 2720 int set = strtoul(av[1], NULL, 10); 2721 if (set < 0 || set > RESVD_SET) 2722 errx(EX_DATAERR, "illegal set %s", av[1]); 2723 rule->set = set; 2724 av += 2; ac -= 2; 2725 } 2726 2727 /* [prob D] -- match probability, optional */ 2728 if (ac > 1 && _substrcmp(*av, "prob") == 0) { 2729 match_prob = strtod(av[1], NULL); 2730 2731 if (match_prob <= 0 || match_prob > 1) 2732 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2733 av += 2; ac -= 2; 2734 } 2735 2736 /* action -- mandatory */ 2737 NEED1("missing action"); 2738 i = match_token(rule_actions, *av); 2739 ac--; av++; 2740 action->len = 1; /* default */ 2741 switch(i) { 2742 case TOK_CHECKSTATE: 2743 have_state = action; 2744 action->opcode = O_CHECK_STATE; 2745 break; 2746 2747 case TOK_ACCEPT: 2748 action->opcode = O_ACCEPT; 2749 break; 2750 2751 case TOK_DENY: 2752 action->opcode = O_DENY; 2753 action->arg1 = 0; 2754 break; 2755 2756 case TOK_REJECT: 2757 action->opcode = O_REJECT; 2758 action->arg1 = ICMP_UNREACH_HOST; 2759 break; 2760 2761 case TOK_RESET: 2762 action->opcode = O_REJECT; 2763 action->arg1 = ICMP_REJECT_RST; 2764 break; 2765 2766 case TOK_RESET6: 2767 action->opcode = O_UNREACH6; 2768 action->arg1 = ICMP6_UNREACH_RST; 2769 break; 2770 2771 case TOK_UNREACH: 2772 action->opcode = O_REJECT; 2773 NEED1("missing reject code"); 2774 fill_reject_code(&action->arg1, *av); 2775 ac--; av++; 2776 break; 2777 2778 case TOK_UNREACH6: 2779 action->opcode = O_UNREACH6; 2780 NEED1("missing unreach code"); 2781 fill_unreach6_code(&action->arg1, *av); 2782 ac--; av++; 2783 break; 2784 2785 case TOK_COUNT: 2786 action->opcode = O_COUNT; 2787 break; 2788 2789 case TOK_NAT: 2790 action->opcode = O_NAT; 2791 action->len = F_INSN_SIZE(ipfw_insn_nat); 2792 goto chkarg; 2793 2794 case TOK_QUEUE: 2795 action->opcode = O_QUEUE; 2796 goto chkarg; 2797 case TOK_PIPE: 2798 action->opcode = O_PIPE; 2799 goto chkarg; 2800 case TOK_SKIPTO: 2801 action->opcode = O_SKIPTO; 2802 goto chkarg; 2803 case TOK_NETGRAPH: 2804 action->opcode = O_NETGRAPH; 2805 goto chkarg; 2806 case TOK_NGTEE: 2807 action->opcode = O_NGTEE; 2808 goto chkarg; 2809 case TOK_DIVERT: 2810 action->opcode = O_DIVERT; 2811 goto chkarg; 2812 case TOK_TEE: 2813 action->opcode = O_TEE; 2814 chkarg: 2815 if (!ac) 2816 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2817 if (isdigit(**av)) { 2818 action->arg1 = strtoul(*av, NULL, 10); 2819 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2820 errx(EX_DATAERR, "illegal argument for %s", 2821 *(av - 1)); 2822 } else if (_substrcmp(*av, "tablearg") == 0) { 2823 action->arg1 = IP_FW_TABLEARG; 2824 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2825 struct servent *s; 2826 setservent(1); 2827 s = getservbyname(av[0], "divert"); 2828 if (s != NULL) 2829 action->arg1 = ntohs(s->s_port); 2830 else 2831 errx(EX_DATAERR, "illegal divert/tee port"); 2832 } else 2833 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2834 ac--; av++; 2835 break; 2836 2837 case TOK_FORWARD: { 2838 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2839 char *s, *end; 2840 2841 NEED1("missing forward address[:port]"); 2842 2843 action->opcode = O_FORWARD_IP; 2844 action->len = F_INSN_SIZE(ipfw_insn_sa); 2845 2846 p->sa.sin_len = sizeof(struct sockaddr_in); 2847 p->sa.sin_family = AF_INET; 2848 p->sa.sin_port = 0; 2849 /* 2850 * locate the address-port separator (':' or ',') 2851 */ 2852 s = strchr(*av, ':'); 2853 if (s == NULL) 2854 s = strchr(*av, ','); 2855 if (s != NULL) { 2856 *(s++) = '\0'; 2857 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2858 if (s == end) 2859 errx(EX_DATAERR, 2860 "illegal forwarding port ``%s''", s); 2861 p->sa.sin_port = (u_short)i; 2862 } 2863 if (_substrcmp(*av, "tablearg") == 0) 2864 p->sa.sin_addr.s_addr = INADDR_ANY; 2865 else 2866 lookup_host(*av, &(p->sa.sin_addr)); 2867 ac--; av++; 2868 break; 2869 } 2870 case TOK_COMMENT: 2871 /* pretend it is a 'count' rule followed by the comment */ 2872 action->opcode = O_COUNT; 2873 ac++; av--; /* go back... */ 2874 break; 2875 2876 case TOK_SETFIB: 2877 { 2878 int numfibs; 2879 size_t intsize = sizeof(int); 2880 2881 action->opcode = O_SETFIB; 2882 NEED1("missing fib number"); 2883 action->arg1 = strtoul(*av, NULL, 10); 2884 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2885 errx(EX_DATAERR, "fibs not suported.\n"); 2886 if (action->arg1 >= numfibs) /* Temporary */ 2887 errx(EX_DATAERR, "fib too large.\n"); 2888 ac--; av++; 2889 break; 2890 } 2891 2892 default: 2893 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2894 } 2895 action = next_cmd(action); 2896 2897 /* 2898 * [altq queuename] -- altq tag, optional 2899 * [log [logamount N]] -- log, optional 2900 * 2901 * If they exist, it go first in the cmdbuf, but then it is 2902 * skipped in the copy section to the end of the buffer. 2903 */ 2904 while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) { 2905 ac--; av++; 2906 switch (i) { 2907 case TOK_LOG: 2908 { 2909 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2910 int l; 2911 2912 if (have_log) 2913 errx(EX_DATAERR, 2914 "log cannot be specified more than once"); 2915 have_log = (ipfw_insn *)c; 2916 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2917 cmd->opcode = O_LOG; 2918 if (ac && _substrcmp(*av, "logamount") == 0) { 2919 ac--; av++; 2920 NEED1("logamount requires argument"); 2921 l = atoi(*av); 2922 if (l < 0) 2923 errx(EX_DATAERR, 2924 "logamount must be positive"); 2925 c->max_log = l; 2926 ac--; av++; 2927 } else { 2928 len = sizeof(c->max_log); 2929 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2930 &c->max_log, &len, NULL, 0) == -1) 2931 errx(1, "sysctlbyname(\"%s\")", 2932 "net.inet.ip.fw.verbose_limit"); 2933 } 2934 } 2935 break; 2936 2937 case TOK_ALTQ: 2938 { 2939 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2940 2941 NEED1("missing altq queue name"); 2942 if (have_altq) 2943 errx(EX_DATAERR, 2944 "altq cannot be specified more than once"); 2945 have_altq = (ipfw_insn *)a; 2946 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2947 cmd->opcode = O_ALTQ; 2948 fill_altq_qid(&a->qid, *av); 2949 ac--; av++; 2950 } 2951 break; 2952 2953 case TOK_TAG: 2954 case TOK_UNTAG: { 2955 uint16_t tag; 2956 2957 if (have_tag) 2958 errx(EX_USAGE, "tag and untag cannot be " 2959 "specified more than once"); 2960 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, i, 2961 rule_action_params); 2962 have_tag = cmd; 2963 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2964 ac--; av++; 2965 break; 2966 } 2967 2968 default: 2969 abort(); 2970 } 2971 cmd = next_cmd(cmd); 2972 } 2973 2974 if (have_state) /* must be a check-state, we are done */ 2975 goto done; 2976 2977 #define OR_START(target) \ 2978 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2979 if (open_par) \ 2980 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2981 prev = NULL; \ 2982 open_par = 1; \ 2983 if ( (av[0])[1] == '\0') { \ 2984 ac--; av++; \ 2985 } else \ 2986 (*av)++; \ 2987 } \ 2988 target: \ 2989 2990 2991 #define CLOSE_PAR \ 2992 if (open_par) { \ 2993 if (ac && ( \ 2994 strcmp(*av, ")") == 0 || \ 2995 strcmp(*av, "}") == 0)) { \ 2996 prev = NULL; \ 2997 open_par = 0; \ 2998 ac--; av++; \ 2999 } else \ 3000 errx(EX_USAGE, "missing \")\"\n"); \ 3001 } 3002 3003 #define NOT_BLOCK \ 3004 if (ac && _substrcmp(*av, "not") == 0) { \ 3005 if (cmd->len & F_NOT) \ 3006 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 3007 cmd->len |= F_NOT; \ 3008 ac--; av++; \ 3009 } 3010 3011 #define OR_BLOCK(target) \ 3012 if (ac && _substrcmp(*av, "or") == 0) { \ 3013 if (prev == NULL || open_par == 0) \ 3014 errx(EX_DATAERR, "invalid OR block"); \ 3015 prev->len |= F_OR; \ 3016 ac--; av++; \ 3017 goto target; \ 3018 } \ 3019 CLOSE_PAR; 3020 3021 first_cmd = cmd; 3022 3023 #if 0 3024 /* 3025 * MAC addresses, optional. 3026 * If we have this, we skip the part "proto from src to dst" 3027 * and jump straight to the option parsing. 3028 */ 3029 NOT_BLOCK; 3030 NEED1("missing protocol"); 3031 if (_substrcmp(*av, "MAC") == 0 || 3032 _substrcmp(*av, "mac") == 0) { 3033 ac--; av++; /* the "MAC" keyword */ 3034 add_mac(cmd, ac, av); /* exits in case of errors */ 3035 cmd = next_cmd(cmd); 3036 ac -= 2; av += 2; /* dst-mac and src-mac */ 3037 NOT_BLOCK; 3038 NEED1("missing mac type"); 3039 if (add_mactype(cmd, ac, av[0])) 3040 cmd = next_cmd(cmd); 3041 ac--; av++; /* any or mac-type */ 3042 goto read_options; 3043 } 3044 #endif 3045 3046 /* 3047 * protocol, mandatory 3048 */ 3049 OR_START(get_proto); 3050 NOT_BLOCK; 3051 NEED1("missing protocol"); 3052 if (add_proto_compat(cmd, *av, &proto)) { 3053 av++; ac--; 3054 if (F_LEN(cmd) != 0) { 3055 prev = cmd; 3056 cmd = next_cmd(cmd); 3057 } 3058 } else if (first_cmd != cmd) { 3059 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3060 } else 3061 goto read_options; 3062 OR_BLOCK(get_proto); 3063 3064 /* 3065 * "from", mandatory 3066 */ 3067 if (!ac || _substrcmp(*av, "from") != 0) 3068 errx(EX_USAGE, "missing ``from''"); 3069 ac--; av++; 3070 3071 /* 3072 * source IP, mandatory 3073 */ 3074 OR_START(source_ip); 3075 NOT_BLOCK; /* optional "not" */ 3076 NEED1("missing source address"); 3077 if (add_src(cmd, *av, proto)) { 3078 ac--; av++; 3079 if (F_LEN(cmd) != 0) { /* ! any */ 3080 prev = cmd; 3081 cmd = next_cmd(cmd); 3082 } 3083 } else 3084 errx(EX_USAGE, "bad source address %s", *av); 3085 OR_BLOCK(source_ip); 3086 3087 /* 3088 * source ports, optional 3089 */ 3090 NOT_BLOCK; /* optional "not" */ 3091 if (ac) { 3092 if (_substrcmp(*av, "any") == 0 || 3093 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3094 ac--; av++; 3095 if (F_LEN(cmd) != 0) 3096 cmd = next_cmd(cmd); 3097 } 3098 } 3099 3100 /* 3101 * "to", mandatory 3102 */ 3103 if (!ac || _substrcmp(*av, "to") != 0) 3104 errx(EX_USAGE, "missing ``to''"); 3105 av++; ac--; 3106 3107 /* 3108 * destination, mandatory 3109 */ 3110 OR_START(dest_ip); 3111 NOT_BLOCK; /* optional "not" */ 3112 NEED1("missing dst address"); 3113 if (add_dst(cmd, *av, proto)) { 3114 ac--; av++; 3115 if (F_LEN(cmd) != 0) { /* ! any */ 3116 prev = cmd; 3117 cmd = next_cmd(cmd); 3118 } 3119 } else 3120 errx( EX_USAGE, "bad destination address %s", *av); 3121 OR_BLOCK(dest_ip); 3122 3123 /* 3124 * dest. ports, optional 3125 */ 3126 NOT_BLOCK; /* optional "not" */ 3127 if (ac) { 3128 if (_substrcmp(*av, "any") == 0 || 3129 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3130 ac--; av++; 3131 if (F_LEN(cmd) != 0) 3132 cmd = next_cmd(cmd); 3133 } 3134 } 3135 3136 read_options: 3137 if (ac && first_cmd == cmd) { 3138 /* 3139 * nothing specified so far, store in the rule to ease 3140 * printout later. 3141 */ 3142 rule->_pad = 1; 3143 } 3144 prev = NULL; 3145 while (ac) { 3146 char *s; 3147 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3148 3149 s = *av; 3150 cmd32 = (ipfw_insn_u32 *)cmd; 3151 3152 if (*s == '!') { /* alternate syntax for NOT */ 3153 if (cmd->len & F_NOT) 3154 errx(EX_USAGE, "double \"not\" not allowed\n"); 3155 cmd->len = F_NOT; 3156 s++; 3157 } 3158 i = match_token(rule_options, s); 3159 ac--; av++; 3160 switch(i) { 3161 case TOK_NOT: 3162 if (cmd->len & F_NOT) 3163 errx(EX_USAGE, "double \"not\" not allowed\n"); 3164 cmd->len = F_NOT; 3165 break; 3166 3167 case TOK_OR: 3168 if (open_par == 0 || prev == NULL) 3169 errx(EX_USAGE, "invalid \"or\" block\n"); 3170 prev->len |= F_OR; 3171 break; 3172 3173 case TOK_STARTBRACE: 3174 if (open_par) 3175 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3176 open_par = 1; 3177 break; 3178 3179 case TOK_ENDBRACE: 3180 if (!open_par) 3181 errx(EX_USAGE, "+missing \")\"\n"); 3182 open_par = 0; 3183 prev = NULL; 3184 break; 3185 3186 case TOK_IN: 3187 fill_cmd(cmd, O_IN, 0, 0); 3188 break; 3189 3190 case TOK_OUT: 3191 cmd->len ^= F_NOT; /* toggle F_NOT */ 3192 fill_cmd(cmd, O_IN, 0, 0); 3193 break; 3194 3195 case TOK_DIVERTED: 3196 fill_cmd(cmd, O_DIVERTED, 0, 3); 3197 break; 3198 3199 case TOK_DIVERTEDLOOPBACK: 3200 fill_cmd(cmd, O_DIVERTED, 0, 1); 3201 break; 3202 3203 case TOK_DIVERTEDOUTPUT: 3204 fill_cmd(cmd, O_DIVERTED, 0, 2); 3205 break; 3206 3207 case TOK_FRAG: 3208 fill_cmd(cmd, O_FRAG, 0, 0); 3209 break; 3210 3211 case TOK_LAYER2: 3212 fill_cmd(cmd, O_LAYER2, 0, 0); 3213 break; 3214 3215 case TOK_XMIT: 3216 case TOK_RECV: 3217 case TOK_VIA: 3218 NEED1("recv, xmit, via require interface name" 3219 " or address"); 3220 fill_iface((ipfw_insn_if *)cmd, av[0]); 3221 ac--; av++; 3222 if (F_LEN(cmd) == 0) /* not a valid address */ 3223 break; 3224 if (i == TOK_XMIT) 3225 cmd->opcode = O_XMIT; 3226 else if (i == TOK_RECV) 3227 cmd->opcode = O_RECV; 3228 else if (i == TOK_VIA) 3229 cmd->opcode = O_VIA; 3230 break; 3231 3232 case TOK_ICMPTYPES: 3233 NEED1("icmptypes requires list of types"); 3234 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3235 av++; ac--; 3236 break; 3237 3238 case TOK_ICMP6TYPES: 3239 NEED1("icmptypes requires list of types"); 3240 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3241 av++; ac--; 3242 break; 3243 3244 case TOK_IPTTL: 3245 NEED1("ipttl requires TTL"); 3246 if (strpbrk(*av, "-,")) { 3247 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3248 errx(EX_DATAERR, "invalid ipttl %s", *av); 3249 } else 3250 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3251 ac--; av++; 3252 break; 3253 3254 case TOK_IPID: 3255 NEED1("ipid requires id"); 3256 if (strpbrk(*av, "-,")) { 3257 if (!add_ports(cmd, *av, 0, O_IPID)) 3258 errx(EX_DATAERR, "invalid ipid %s", *av); 3259 } else 3260 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3261 ac--; av++; 3262 break; 3263 3264 case TOK_IPLEN: 3265 NEED1("iplen requires length"); 3266 if (strpbrk(*av, "-,")) { 3267 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3268 errx(EX_DATAERR, "invalid ip len %s", *av); 3269 } else 3270 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3271 ac--; av++; 3272 break; 3273 3274 case TOK_IPVER: 3275 NEED1("ipver requires version"); 3276 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3277 ac--; av++; 3278 break; 3279 3280 case TOK_IPPRECEDENCE: 3281 NEED1("ipprecedence requires value"); 3282 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3283 (strtoul(*av, NULL, 0) & 7) << 5); 3284 ac--; av++; 3285 break; 3286 3287 case TOK_IPOPTS: 3288 NEED1("missing argument for ipoptions"); 3289 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3290 ac--; av++; 3291 break; 3292 3293 case TOK_IPTOS: 3294 NEED1("missing argument for iptos"); 3295 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3296 ac--; av++; 3297 break; 3298 3299 case TOK_UID: 3300 NEED1("uid requires argument"); 3301 { 3302 char *end; 3303 uid_t uid; 3304 struct passwd *pwd; 3305 3306 cmd->opcode = O_UID; 3307 uid = strtoul(*av, &end, 0); 3308 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3309 if (pwd == NULL) 3310 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3311 cmd32->d[0] = pwd->pw_uid; 3312 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3313 ac--; av++; 3314 } 3315 break; 3316 3317 case TOK_GID: 3318 NEED1("gid requires argument"); 3319 { 3320 char *end; 3321 gid_t gid; 3322 struct group *grp; 3323 3324 cmd->opcode = O_GID; 3325 gid = strtoul(*av, &end, 0); 3326 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3327 if (grp == NULL) 3328 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3329 cmd32->d[0] = grp->gr_gid; 3330 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3331 ac--; av++; 3332 } 3333 break; 3334 3335 case TOK_JAIL: 3336 NEED1("jail requires argument"); 3337 { 3338 char *end; 3339 int jid; 3340 3341 cmd->opcode = O_JAIL; 3342 jid = (int)strtol(*av, &end, 0); 3343 if (jid < 0 || *end != '\0') 3344 errx(EX_DATAERR, "jail requires prison ID"); 3345 cmd32->d[0] = (uint32_t)jid; 3346 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3347 ac--; av++; 3348 } 3349 break; 3350 3351 case TOK_ESTAB: 3352 fill_cmd(cmd, O_ESTAB, 0, 0); 3353 break; 3354 3355 case TOK_SETUP: 3356 fill_cmd(cmd, O_TCPFLAGS, 0, 3357 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3358 break; 3359 3360 case TOK_TCPDATALEN: 3361 NEED1("tcpdatalen requires length"); 3362 if (strpbrk(*av, "-,")) { 3363 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3364 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3365 } else 3366 fill_cmd(cmd, O_TCPDATALEN, 0, 3367 strtoul(*av, NULL, 0)); 3368 ac--; av++; 3369 break; 3370 3371 case TOK_TCPOPTS: 3372 NEED1("missing argument for tcpoptions"); 3373 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3374 ac--; av++; 3375 break; 3376 3377 case TOK_TCPSEQ: 3378 case TOK_TCPACK: 3379 NEED1("tcpseq/tcpack requires argument"); 3380 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3381 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3382 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3383 ac--; av++; 3384 break; 3385 3386 case TOK_TCPWIN: 3387 NEED1("tcpwin requires length"); 3388 fill_cmd(cmd, O_TCPWIN, 0, 3389 htons(strtoul(*av, NULL, 0))); 3390 ac--; av++; 3391 break; 3392 3393 case TOK_TCPFLAGS: 3394 NEED1("missing argument for tcpflags"); 3395 cmd->opcode = O_TCPFLAGS; 3396 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3397 ac--; av++; 3398 break; 3399 3400 case TOK_KEEPSTATE: 3401 if (open_par) 3402 errx(EX_USAGE, "keep-state cannot be part " 3403 "of an or block"); 3404 if (have_state) 3405 errx(EX_USAGE, "only one of keep-state " 3406 "and limit is allowed"); 3407 have_state = cmd; 3408 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3409 break; 3410 3411 case TOK_LIMIT: { 3412 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3413 int val; 3414 3415 if (open_par) 3416 errx(EX_USAGE, 3417 "limit cannot be part of an or block"); 3418 if (have_state) 3419 errx(EX_USAGE, "only one of keep-state and " 3420 "limit is allowed"); 3421 have_state = cmd; 3422 3423 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3424 cmd->opcode = O_LIMIT; 3425 c->limit_mask = c->conn_limit = 0; 3426 3427 while (ac > 0) { 3428 if ((val = match_token(limit_masks, *av)) <= 0) 3429 break; 3430 c->limit_mask |= val; 3431 ac--; av++; 3432 } 3433 3434 if (c->limit_mask == 0) 3435 errx(EX_USAGE, "limit: missing limit mask"); 3436 3437 GET_UINT_ARG(c->conn_limit, 1, IPFW_DEFAULT_RULE - 1, 3438 TOK_LIMIT, rule_options); 3439 3440 ac--; av++; 3441 break; 3442 } 3443 3444 case TOK_PROTO: 3445 NEED1("missing protocol"); 3446 if (add_proto(cmd, *av, &proto)) { 3447 ac--; av++; 3448 } else 3449 errx(EX_DATAERR, "invalid protocol ``%s''", 3450 *av); 3451 break; 3452 3453 case TOK_SRCIP: 3454 NEED1("missing source IP"); 3455 if (add_srcip(cmd, *av)) { 3456 ac--; av++; 3457 } 3458 break; 3459 3460 case TOK_DSTIP: 3461 NEED1("missing destination IP"); 3462 if (add_dstip(cmd, *av)) { 3463 ac--; av++; 3464 } 3465 break; 3466 3467 case TOK_SRCIP6: 3468 NEED1("missing source IP6"); 3469 if (add_srcip6(cmd, *av)) { 3470 ac--; av++; 3471 } 3472 break; 3473 3474 case TOK_DSTIP6: 3475 NEED1("missing destination IP6"); 3476 if (add_dstip6(cmd, *av)) { 3477 ac--; av++; 3478 } 3479 break; 3480 3481 case TOK_SRCPORT: 3482 NEED1("missing source port"); 3483 if (_substrcmp(*av, "any") == 0 || 3484 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3485 ac--; av++; 3486 } else 3487 errx(EX_DATAERR, "invalid source port %s", *av); 3488 break; 3489 3490 case TOK_DSTPORT: 3491 NEED1("missing destination port"); 3492 if (_substrcmp(*av, "any") == 0 || 3493 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3494 ac--; av++; 3495 } else 3496 errx(EX_DATAERR, "invalid destination port %s", 3497 *av); 3498 break; 3499 3500 case TOK_MAC: 3501 if (add_mac(cmd, ac, av)) { 3502 ac -= 2; av += 2; 3503 } 3504 break; 3505 3506 case TOK_MACTYPE: 3507 NEED1("missing mac type"); 3508 if (!add_mactype(cmd, ac, *av)) 3509 errx(EX_DATAERR, "invalid mac type %s", *av); 3510 ac--; av++; 3511 break; 3512 3513 case TOK_VERREVPATH: 3514 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3515 break; 3516 3517 case TOK_VERSRCREACH: 3518 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3519 break; 3520 3521 case TOK_ANTISPOOF: 3522 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3523 break; 3524 3525 case TOK_IPSEC: 3526 fill_cmd(cmd, O_IPSEC, 0, 0); 3527 break; 3528 3529 case TOK_IPV6: 3530 fill_cmd(cmd, O_IP6, 0, 0); 3531 break; 3532 3533 case TOK_IPV4: 3534 fill_cmd(cmd, O_IP4, 0, 0); 3535 break; 3536 3537 case TOK_EXT6HDR: 3538 fill_ext6hdr( cmd, *av ); 3539 ac--; av++; 3540 break; 3541 3542 case TOK_FLOWID: 3543 if (proto != IPPROTO_IPV6 ) 3544 errx( EX_USAGE, "flow-id filter is active " 3545 "only for ipv6 protocol\n"); 3546 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3547 ac--; av++; 3548 break; 3549 3550 case TOK_COMMENT: 3551 fill_comment(cmd, ac, av); 3552 av += ac; 3553 ac = 0; 3554 break; 3555 3556 case TOK_TAGGED: 3557 if (ac > 0 && strpbrk(*av, "-,")) { 3558 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3559 errx(EX_DATAERR, "tagged: invalid tag" 3560 " list: %s", *av); 3561 } 3562 else { 3563 uint16_t tag; 3564 3565 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, 3566 TOK_TAGGED, rule_options); 3567 fill_cmd(cmd, O_TAGGED, 0, tag); 3568 } 3569 ac--; av++; 3570 break; 3571 3572 case TOK_FIB: 3573 NEED1("fib requires fib number"); 3574 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3575 ac--; av++; 3576 break; 3577 3578 default: 3579 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3580 } 3581 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3582 prev = cmd; 3583 cmd = next_cmd(cmd); 3584 } 3585 } 3586 3587 done: 3588 /* 3589 * Now copy stuff into the rule. 3590 * If we have a keep-state option, the first instruction 3591 * must be a PROBE_STATE (which is generated here). 3592 * If we have a LOG option, it was stored as the first command, 3593 * and now must be moved to the top of the action part. 3594 */ 3595 dst = (ipfw_insn *)rule->cmd; 3596 3597 /* 3598 * First thing to write into the command stream is the match probability. 3599 */ 3600 if (match_prob != 1) { /* 1 means always match */ 3601 dst->opcode = O_PROB; 3602 dst->len = 2; 3603 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3604 dst += dst->len; 3605 } 3606 3607 /* 3608 * generate O_PROBE_STATE if necessary 3609 */ 3610 if (have_state && have_state->opcode != O_CHECK_STATE) { 3611 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3612 dst = next_cmd(dst); 3613 } 3614 3615 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3616 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3617 i = F_LEN(src); 3618 3619 switch (src->opcode) { 3620 case O_LOG: 3621 case O_KEEP_STATE: 3622 case O_LIMIT: 3623 case O_ALTQ: 3624 case O_TAG: 3625 break; 3626 default: 3627 bcopy(src, dst, i * sizeof(uint32_t)); 3628 dst += i; 3629 } 3630 } 3631 3632 /* 3633 * put back the have_state command as last opcode 3634 */ 3635 if (have_state && have_state->opcode != O_CHECK_STATE) { 3636 i = F_LEN(have_state); 3637 bcopy(have_state, dst, i * sizeof(uint32_t)); 3638 dst += i; 3639 } 3640 /* 3641 * start action section 3642 */ 3643 rule->act_ofs = dst - rule->cmd; 3644 3645 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3646 if (have_log) { 3647 i = F_LEN(have_log); 3648 bcopy(have_log, dst, i * sizeof(uint32_t)); 3649 dst += i; 3650 } 3651 if (have_altq) { 3652 i = F_LEN(have_altq); 3653 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3654 dst += i; 3655 } 3656 if (have_tag) { 3657 i = F_LEN(have_tag); 3658 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3659 dst += i; 3660 } 3661 /* 3662 * copy all other actions 3663 */ 3664 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3665 i = F_LEN(src); 3666 bcopy(src, dst, i * sizeof(uint32_t)); 3667 dst += i; 3668 } 3669 3670 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3671 i = (char *)dst - (char *)rule; 3672 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3673 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3674 if (!co.do_quiet) 3675 show_ipfw(rule, 0, 0); 3676 } 3677 3678 /* 3679 * clear the counters or the log counters. 3680 */ 3681 void 3682 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3683 { 3684 uint32_t arg, saved_arg; 3685 int failed = EX_OK; 3686 char const *errstr; 3687 char const *name = optname ? "RESETLOG" : "ZERO"; 3688 3689 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3690 3691 av++; ac--; 3692 3693 if (!ac) { 3694 /* clear all entries */ 3695 if (do_cmd(optname, NULL, 0) < 0) 3696 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3697 if (!co.do_quiet) 3698 printf("%s.\n", optname == IP_FW_ZERO ? 3699 "Accounting cleared":"Logging counts reset"); 3700 3701 return; 3702 } 3703 3704 while (ac) { 3705 /* Rule number */ 3706 if (isdigit(**av)) { 3707 arg = strtonum(*av, 0, 0xffff, &errstr); 3708 if (errstr) 3709 errx(EX_DATAERR, 3710 "invalid rule number %s\n", *av); 3711 saved_arg = arg; 3712 if (co.use_set) 3713 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3714 av++; 3715 ac--; 3716 if (do_cmd(optname, &arg, sizeof(arg))) { 3717 warn("rule %u: setsockopt(IP_FW_%s)", 3718 saved_arg, name); 3719 failed = EX_UNAVAILABLE; 3720 } else if (!co.do_quiet) 3721 printf("Entry %d %s.\n", saved_arg, 3722 optname == IP_FW_ZERO ? 3723 "cleared" : "logging count reset"); 3724 } else { 3725 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3726 } 3727 } 3728 if (failed != EX_OK) 3729 exit(failed); 3730 } 3731 3732 void 3733 ipfw_flush(int force) 3734 { 3735 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3736 3737 if (!force && !co.do_quiet) { /* need to ask user */ 3738 int c; 3739 3740 printf("Are you sure? [yn] "); 3741 fflush(stdout); 3742 do { 3743 c = toupper(getc(stdin)); 3744 while (c != '\n' && getc(stdin) != '\n') 3745 if (feof(stdin)) 3746 return; /* and do not flush */ 3747 } while (c != 'Y' && c != 'N'); 3748 printf("\n"); 3749 if (c == 'N') /* user said no */ 3750 return; 3751 } 3752 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3753 if (co.use_set) { 3754 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3755 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3756 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3757 } else if (do_cmd(cmd, NULL, 0) < 0) 3758 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3759 co.do_pipe ? "DUMMYNET" : "FW"); 3760 if (!co.do_quiet) 3761 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3762 } 3763 3764 3765 static void table_list(ipfw_table_entry ent, int need_header); 3766 3767 /* 3768 * This one handles all table-related commands 3769 * ipfw table N add addr[/masklen] [value] 3770 * ipfw table N delete addr[/masklen] 3771 * ipfw table {N | all} flush 3772 * ipfw table {N | all} list 3773 */ 3774 void 3775 ipfw_table_handler(int ac, char *av[]) 3776 { 3777 ipfw_table_entry ent; 3778 int do_add; 3779 int is_all; 3780 size_t len; 3781 char *p; 3782 uint32_t a; 3783 uint32_t tables_max; 3784 3785 len = sizeof(tables_max); 3786 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3787 NULL, 0) == -1) { 3788 #ifdef IPFW_TABLES_MAX 3789 warn("Warn: Failed to get the max tables number via sysctl. " 3790 "Using the compiled in defaults. \nThe reason was"); 3791 tables_max = IPFW_TABLES_MAX; 3792 #else 3793 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3794 #endif 3795 } 3796 3797 ac--; av++; 3798 if (ac && isdigit(**av)) { 3799 ent.tbl = atoi(*av); 3800 is_all = 0; 3801 ac--; av++; 3802 } else if (ac && _substrcmp(*av, "all") == 0) { 3803 ent.tbl = 0; 3804 is_all = 1; 3805 ac--; av++; 3806 } else 3807 errx(EX_USAGE, "table number or 'all' keyword required"); 3808 if (ent.tbl >= tables_max) 3809 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3810 "value (%d)", tables_max - 1); 3811 NEED1("table needs command"); 3812 if (is_all && _substrcmp(*av, "list") != 0 3813 && _substrcmp(*av, "flush") != 0) 3814 errx(EX_USAGE, "table number required"); 3815 3816 if (_substrcmp(*av, "add") == 0 || 3817 _substrcmp(*av, "delete") == 0) { 3818 do_add = **av == 'a'; 3819 ac--; av++; 3820 if (!ac) 3821 errx(EX_USAGE, "IP address required"); 3822 p = strchr(*av, '/'); 3823 if (p) { 3824 *p++ = '\0'; 3825 ent.masklen = atoi(p); 3826 if (ent.masklen > 32) 3827 errx(EX_DATAERR, "bad width ``%s''", p); 3828 } else 3829 ent.masklen = 32; 3830 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3831 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3832 ac--; av++; 3833 if (do_add && ac) { 3834 unsigned int tval; 3835 /* isdigit is a bit of a hack here.. */ 3836 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3837 ent.value = strtoul(*av, NULL, 0); 3838 } else { 3839 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3840 /* The value must be stored in host order * 3841 * so that the values < 65k can be distinguished */ 3842 ent.value = ntohl(tval); 3843 } else { 3844 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3845 } 3846 } 3847 } else 3848 ent.value = 0; 3849 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3850 &ent, sizeof(ent)) < 0) { 3851 /* If running silent, don't bomb out on these errors. */ 3852 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3853 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3854 do_add ? "ADD" : "DEL"); 3855 /* In silent mode, react to a failed add by deleting */ 3856 if (do_add) { 3857 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3858 if (do_cmd(IP_FW_TABLE_ADD, 3859 &ent, sizeof(ent)) < 0) 3860 err(EX_OSERR, 3861 "setsockopt(IP_FW_TABLE_ADD)"); 3862 } 3863 } 3864 } else if (_substrcmp(*av, "flush") == 0) { 3865 a = is_all ? tables_max : (ent.tbl + 1); 3866 do { 3867 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3868 sizeof(ent.tbl)) < 0) 3869 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3870 } while (++ent.tbl < a); 3871 } else if (_substrcmp(*av, "list") == 0) { 3872 a = is_all ? tables_max : (ent.tbl + 1); 3873 do { 3874 table_list(ent, is_all); 3875 } while (++ent.tbl < a); 3876 } else 3877 errx(EX_USAGE, "invalid table command %s", *av); 3878 } 3879 3880 static void 3881 table_list(ipfw_table_entry ent, int need_header) 3882 { 3883 ipfw_table *tbl; 3884 socklen_t l; 3885 uint32_t a; 3886 3887 a = ent.tbl; 3888 l = sizeof(a); 3889 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3890 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3891 3892 /* If a is zero we have nothing to do, the table is empty. */ 3893 if (a == 0) 3894 return; 3895 3896 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3897 tbl = safe_calloc(1, l); 3898 tbl->tbl = ent.tbl; 3899 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3900 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3901 if (tbl->cnt && need_header) 3902 printf("---table(%d)---\n", tbl->tbl); 3903 for (a = 0; a < tbl->cnt; a++) { 3904 unsigned int tval; 3905 tval = tbl->ent[a].value; 3906 if (co.do_value_as_ip) { 3907 char tbuf[128]; 3908 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3909 &tbl->ent[a].addr), 127); 3910 /* inet_ntoa expects network order */ 3911 tval = htonl(tval); 3912 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3913 inet_ntoa(*(struct in_addr *)&tval)); 3914 } else { 3915 printf("%s/%u %u\n", 3916 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3917 tbl->ent[a].masklen, tval); 3918 } 3919 } 3920 free(tbl); 3921 } 3922