ipfw2.c revision 206266
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: head/sbin/ipfw/ipfw2.c 206266 2010-04-06 12:28:08Z ume $ 21 */ 22 23#include <sys/types.h> 24#include <sys/socket.h> 25#include <sys/sockio.h> 26#include <sys/sysctl.h> 27 28#include "ipfw2.h" 29 30#include <ctype.h> 31#include <err.h> 32#include <errno.h> 33#include <grp.h> 34#include <netdb.h> 35#include <pwd.h> 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <sysexits.h> 40#include <time.h> /* ctime */ 41#include <timeconv.h> /* _long_to_time */ 42#include <unistd.h> 43#include <fcntl.h> 44 45#include <net/ethernet.h> 46#include <net/if.h> /* only IFNAMSIZ */ 47#include <netinet/in.h> 48#include <netinet/in_systm.h> /* only n_short, n_long */ 49#include <netinet/ip.h> 50#include <netinet/ip_icmp.h> 51#include <netinet/ip_fw.h> 52#include <netinet/tcp.h> 53#include <arpa/inet.h> 54 55struct cmdline_opts co; /* global options */ 56 57int resvd_set_number = RESVD_SET; 58 59#define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 60 if (!av[0]) \ 61 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 62 if (_substrcmp(*av, "tablearg") == 0) { \ 63 arg = IP_FW_TABLEARG; \ 64 break; \ 65 } \ 66 \ 67 { \ 68 long _xval; \ 69 char *end; \ 70 \ 71 _xval = strtol(*av, &end, 10); \ 72 \ 73 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 74 errx(EX_DATAERR, "%s: invalid argument: %s", \ 75 match_value(s_x, tok), *av); \ 76 \ 77 if (errno == ERANGE || _xval < min || _xval > max) \ 78 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 79 match_value(s_x, tok), min, max, *av); \ 80 \ 81 if (_xval == IP_FW_TABLEARG) \ 82 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 83 match_value(s_x, tok), *av); \ 84 arg = _xval; \ 85 } \ 86} while (0) 87 88static void 89PRINT_UINT_ARG(const char *str, uint32_t arg) 90{ 91 if (str != NULL) 92 printf("%s",str); 93 if (arg == IP_FW_TABLEARG) 94 printf("tablearg"); 95 else 96 printf("%u", arg); 97} 98 99static struct _s_x f_tcpflags[] = { 100 { "syn", TH_SYN }, 101 { "fin", TH_FIN }, 102 { "ack", TH_ACK }, 103 { "psh", TH_PUSH }, 104 { "rst", TH_RST }, 105 { "urg", TH_URG }, 106 { "tcp flag", 0 }, 107 { NULL, 0 } 108}; 109 110static struct _s_x f_tcpopts[] = { 111 { "mss", IP_FW_TCPOPT_MSS }, 112 { "maxseg", IP_FW_TCPOPT_MSS }, 113 { "window", IP_FW_TCPOPT_WINDOW }, 114 { "sack", IP_FW_TCPOPT_SACK }, 115 { "ts", IP_FW_TCPOPT_TS }, 116 { "timestamp", IP_FW_TCPOPT_TS }, 117 { "cc", IP_FW_TCPOPT_CC }, 118 { "tcp option", 0 }, 119 { NULL, 0 } 120}; 121 122/* 123 * IP options span the range 0 to 255 so we need to remap them 124 * (though in fact only the low 5 bits are significant). 125 */ 126static struct _s_x f_ipopts[] = { 127 { "ssrr", IP_FW_IPOPT_SSRR}, 128 { "lsrr", IP_FW_IPOPT_LSRR}, 129 { "rr", IP_FW_IPOPT_RR}, 130 { "ts", IP_FW_IPOPT_TS}, 131 { "ip option", 0 }, 132 { NULL, 0 } 133}; 134 135static struct _s_x f_iptos[] = { 136 { "lowdelay", IPTOS_LOWDELAY}, 137 { "throughput", IPTOS_THROUGHPUT}, 138 { "reliability", IPTOS_RELIABILITY}, 139 { "mincost", IPTOS_MINCOST}, 140 { "congestion", IPTOS_ECN_CE}, 141 { "ecntransport", IPTOS_ECN_ECT0}, 142 { "ip tos option", 0}, 143 { NULL, 0 } 144}; 145 146static struct _s_x limit_masks[] = { 147 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 148 {"src-addr", DYN_SRC_ADDR}, 149 {"src-port", DYN_SRC_PORT}, 150 {"dst-addr", DYN_DST_ADDR}, 151 {"dst-port", DYN_DST_PORT}, 152 {NULL, 0} 153}; 154 155/* 156 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 157 * This is only used in this code. 158 */ 159#define IPPROTO_ETHERTYPE 0x1000 160static struct _s_x ether_types[] = { 161 /* 162 * Note, we cannot use "-:&/" in the names because they are field 163 * separators in the type specifications. Also, we use s = NULL as 164 * end-delimiter, because a type of 0 can be legal. 165 */ 166 { "ip", 0x0800 }, 167 { "ipv4", 0x0800 }, 168 { "ipv6", 0x86dd }, 169 { "arp", 0x0806 }, 170 { "rarp", 0x8035 }, 171 { "vlan", 0x8100 }, 172 { "loop", 0x9000 }, 173 { "trail", 0x1000 }, 174 { "at", 0x809b }, 175 { "atalk", 0x809b }, 176 { "aarp", 0x80f3 }, 177 { "pppoe_disc", 0x8863 }, 178 { "pppoe_sess", 0x8864 }, 179 { "ipx_8022", 0x00E0 }, 180 { "ipx_8023", 0x0000 }, 181 { "ipx_ii", 0x8137 }, 182 { "ipx_snap", 0x8137 }, 183 { "ipx", 0x8137 }, 184 { "ns", 0x0600 }, 185 { NULL, 0 } 186}; 187 188 189static struct _s_x rule_actions[] = { 190 { "accept", TOK_ACCEPT }, 191 { "pass", TOK_ACCEPT }, 192 { "allow", TOK_ACCEPT }, 193 { "permit", TOK_ACCEPT }, 194 { "count", TOK_COUNT }, 195 { "pipe", TOK_PIPE }, 196 { "queue", TOK_QUEUE }, 197 { "divert", TOK_DIVERT }, 198 { "tee", TOK_TEE }, 199 { "netgraph", TOK_NETGRAPH }, 200 { "ngtee", TOK_NGTEE }, 201 { "fwd", TOK_FORWARD }, 202 { "forward", TOK_FORWARD }, 203 { "skipto", TOK_SKIPTO }, 204 { "deny", TOK_DENY }, 205 { "drop", TOK_DENY }, 206 { "reject", TOK_REJECT }, 207 { "reset6", TOK_RESET6 }, 208 { "reset", TOK_RESET }, 209 { "unreach6", TOK_UNREACH6 }, 210 { "unreach", TOK_UNREACH }, 211 { "check-state", TOK_CHECKSTATE }, 212 { "//", TOK_COMMENT }, 213 { "nat", TOK_NAT }, 214 { "reass", TOK_REASS }, 215 { "setfib", TOK_SETFIB }, 216 { NULL, 0 } /* terminator */ 217}; 218 219static struct _s_x rule_action_params[] = { 220 { "altq", TOK_ALTQ }, 221 { "log", TOK_LOG }, 222 { "tag", TOK_TAG }, 223 { "untag", TOK_UNTAG }, 224 { NULL, 0 } /* terminator */ 225}; 226 227/* 228 * The 'lookup' instruction accepts one of the following arguments. 229 * -1 is a terminator for the list. 230 * Arguments are passed as v[1] in O_DST_LOOKUP options. 231 */ 232static int lookup_key[] = { 233 TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, 234 TOK_UID, TOK_JAIL, TOK_DSCP, -1 }; 235 236static struct _s_x rule_options[] = { 237 { "tagged", TOK_TAGGED }, 238 { "uid", TOK_UID }, 239 { "gid", TOK_GID }, 240 { "jail", TOK_JAIL }, 241 { "in", TOK_IN }, 242 { "limit", TOK_LIMIT }, 243 { "keep-state", TOK_KEEPSTATE }, 244 { "bridged", TOK_LAYER2 }, 245 { "layer2", TOK_LAYER2 }, 246 { "out", TOK_OUT }, 247 { "diverted", TOK_DIVERTED }, 248 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 249 { "diverted-output", TOK_DIVERTEDOUTPUT }, 250 { "xmit", TOK_XMIT }, 251 { "recv", TOK_RECV }, 252 { "via", TOK_VIA }, 253 { "fragment", TOK_FRAG }, 254 { "frag", TOK_FRAG }, 255 { "fib", TOK_FIB }, 256 { "ipoptions", TOK_IPOPTS }, 257 { "ipopts", TOK_IPOPTS }, 258 { "iplen", TOK_IPLEN }, 259 { "ipid", TOK_IPID }, 260 { "ipprecedence", TOK_IPPRECEDENCE }, 261 { "dscp", TOK_DSCP }, 262 { "iptos", TOK_IPTOS }, 263 { "ipttl", TOK_IPTTL }, 264 { "ipversion", TOK_IPVER }, 265 { "ipver", TOK_IPVER }, 266 { "estab", TOK_ESTAB }, 267 { "established", TOK_ESTAB }, 268 { "setup", TOK_SETUP }, 269 { "tcpdatalen", TOK_TCPDATALEN }, 270 { "tcpflags", TOK_TCPFLAGS }, 271 { "tcpflgs", TOK_TCPFLAGS }, 272 { "tcpoptions", TOK_TCPOPTS }, 273 { "tcpopts", TOK_TCPOPTS }, 274 { "tcpseq", TOK_TCPSEQ }, 275 { "tcpack", TOK_TCPACK }, 276 { "tcpwin", TOK_TCPWIN }, 277 { "icmptype", TOK_ICMPTYPES }, 278 { "icmptypes", TOK_ICMPTYPES }, 279 { "dst-ip", TOK_DSTIP }, 280 { "src-ip", TOK_SRCIP }, 281 { "dst-port", TOK_DSTPORT }, 282 { "src-port", TOK_SRCPORT }, 283 { "proto", TOK_PROTO }, 284 { "MAC", TOK_MAC }, 285 { "mac", TOK_MAC }, 286 { "mac-type", TOK_MACTYPE }, 287 { "verrevpath", TOK_VERREVPATH }, 288 { "versrcreach", TOK_VERSRCREACH }, 289 { "antispoof", TOK_ANTISPOOF }, 290 { "ipsec", TOK_IPSEC }, 291 { "icmp6type", TOK_ICMP6TYPES }, 292 { "icmp6types", TOK_ICMP6TYPES }, 293 { "ext6hdr", TOK_EXT6HDR}, 294 { "flow-id", TOK_FLOWID}, 295 { "ipv6", TOK_IPV6}, 296 { "ip6", TOK_IPV6}, 297 { "ipv4", TOK_IPV4}, 298 { "ip4", TOK_IPV4}, 299 { "dst-ipv6", TOK_DSTIP6}, 300 { "dst-ip6", TOK_DSTIP6}, 301 { "src-ipv6", TOK_SRCIP6}, 302 { "src-ip6", TOK_SRCIP6}, 303 { "lookup", TOK_LOOKUP}, 304 { "//", TOK_COMMENT }, 305 306 { "not", TOK_NOT }, /* pseudo option */ 307 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 308 { "or", TOK_OR }, /* pseudo option */ 309 { "|", /* escape */ TOK_OR }, /* pseudo option */ 310 { "{", TOK_STARTBRACE }, /* pseudo option */ 311 { "(", TOK_STARTBRACE }, /* pseudo option */ 312 { "}", TOK_ENDBRACE }, /* pseudo option */ 313 { ")", TOK_ENDBRACE }, /* pseudo option */ 314 { NULL, 0 } /* terminator */ 315}; 316 317/* 318 * The following is used to generate a printable argument for 319 * 64-bit numbers, irrespective of platform alignment and bit size. 320 * Because all the printf in this program use %llu as a format, 321 * we just return an unsigned long long, which is larger than 322 * we need in certain cases, but saves the hassle of using 323 * PRIu64 as a format specifier. 324 * We don't care about inlining, this is not performance critical code. 325 */ 326unsigned long long 327align_uint64(const uint64_t *pll) 328{ 329 uint64_t ret; 330 331 bcopy (pll, &ret, sizeof(ret)); 332 return ret; 333} 334 335void * 336safe_calloc(size_t number, size_t size) 337{ 338 void *ret = calloc(number, size); 339 340 if (ret == NULL) 341 err(EX_OSERR, "calloc"); 342 return ret; 343} 344 345void * 346safe_realloc(void *ptr, size_t size) 347{ 348 void *ret = realloc(ptr, size); 349 350 if (ret == NULL) 351 err(EX_OSERR, "realloc"); 352 return ret; 353} 354 355/* 356 * conditionally runs the command. 357 * Selected options or negative -> getsockopt 358 */ 359int 360do_cmd(int optname, void *optval, uintptr_t optlen) 361{ 362 static int s = -1; /* the socket */ 363 int i; 364 365 if (co.test_only) 366 return 0; 367 368 if (s == -1) 369 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 370 if (s < 0) 371 err(EX_UNAVAILABLE, "socket"); 372 373 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 374 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 375 optname == IP_FW_TABLE_GETSIZE || 376 optname == IP_FW_NAT_GET_CONFIG || 377 optname < 0 || 378 optname == IP_FW_NAT_GET_LOG) { 379 if (optname < 0) 380 optname = -optname; 381 i = getsockopt(s, IPPROTO_IP, optname, optval, 382 (socklen_t *)optlen); 383 } else { 384 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 385 } 386 return i; 387} 388 389/** 390 * match_token takes a table and a string, returns the value associated 391 * with the string (-1 in case of failure). 392 */ 393int 394match_token(struct _s_x *table, char *string) 395{ 396 struct _s_x *pt; 397 uint i = strlen(string); 398 399 for (pt = table ; i && pt->s != NULL ; pt++) 400 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 401 return pt->x; 402 return -1; 403} 404 405/** 406 * match_value takes a table and a value, returns the string associated 407 * with the value (NULL in case of failure). 408 */ 409char const * 410match_value(struct _s_x *p, int value) 411{ 412 for (; p->s != NULL; p++) 413 if (p->x == value) 414 return p->s; 415 return NULL; 416} 417 418/* 419 * _substrcmp takes two strings and returns 1 if they do not match, 420 * and 0 if they match exactly or the first string is a sub-string 421 * of the second. A warning is printed to stderr in the case that the 422 * first string is a sub-string of the second. 423 * 424 * This function will be removed in the future through the usual 425 * deprecation process. 426 */ 427int 428_substrcmp(const char *str1, const char* str2) 429{ 430 431 if (strncmp(str1, str2, strlen(str1)) != 0) 432 return 1; 433 434 if (strlen(str1) != strlen(str2)) 435 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 436 str1, str2); 437 return 0; 438} 439 440/* 441 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 442 * and 0 if they match exactly or the second string is a sub-string 443 * of the first. A warning is printed to stderr in the case that the 444 * first string does not match the third. 445 * 446 * This function exists to warn about the bizzare construction 447 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 448 * for "bytes". The problem is that in addition to accepting "by", 449 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 450 * other string beginning with "by". 451 * 452 * This function will be removed in the future through the usual 453 * deprecation process. 454 */ 455int 456_substrcmp2(const char *str1, const char* str2, const char* str3) 457{ 458 459 if (strncmp(str1, str2, strlen(str2)) != 0) 460 return 1; 461 462 if (strcmp(str1, str3) != 0) 463 warnx("DEPRECATED: '%s' matched '%s'", 464 str1, str3); 465 return 0; 466} 467 468/* 469 * prints one port, symbolic or numeric 470 */ 471static void 472print_port(int proto, uint16_t port) 473{ 474 475 if (proto == IPPROTO_ETHERTYPE) { 476 char const *s; 477 478 if (co.do_resolv && (s = match_value(ether_types, port)) ) 479 printf("%s", s); 480 else 481 printf("0x%04x", port); 482 } else { 483 struct servent *se = NULL; 484 if (co.do_resolv) { 485 struct protoent *pe = getprotobynumber(proto); 486 487 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 488 } 489 if (se) 490 printf("%s", se->s_name); 491 else 492 printf("%d", port); 493 } 494} 495 496static struct _s_x _port_name[] = { 497 {"dst-port", O_IP_DSTPORT}, 498 {"src-port", O_IP_SRCPORT}, 499 {"ipid", O_IPID}, 500 {"iplen", O_IPLEN}, 501 {"ipttl", O_IPTTL}, 502 {"mac-type", O_MAC_TYPE}, 503 {"tcpdatalen", O_TCPDATALEN}, 504 {"tagged", O_TAGGED}, 505 {NULL, 0} 506}; 507 508/* 509 * Print the values in a list 16-bit items of the types above. 510 * XXX todo: add support for mask. 511 */ 512static void 513print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 514{ 515 uint16_t *p = cmd->ports; 516 int i; 517 char const *sep; 518 519 if (opcode != 0) { 520 sep = match_value(_port_name, opcode); 521 if (sep == NULL) 522 sep = "???"; 523 printf (" %s", sep); 524 } 525 sep = " "; 526 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 527 printf("%s", sep); 528 print_port(proto, p[0]); 529 if (p[0] != p[1]) { 530 printf("-"); 531 print_port(proto, p[1]); 532 } 533 sep = ","; 534 } 535} 536 537/* 538 * Like strtol, but also translates service names into port numbers 539 * for some protocols. 540 * In particular: 541 * proto == -1 disables the protocol check; 542 * proto == IPPROTO_ETHERTYPE looks up an internal table 543 * proto == <some value in /etc/protocols> matches the values there. 544 * Returns *end == s in case the parameter is not found. 545 */ 546static int 547strtoport(char *s, char **end, int base, int proto) 548{ 549 char *p, *buf; 550 char *s1; 551 int i; 552 553 *end = s; /* default - not found */ 554 if (*s == '\0') 555 return 0; /* not found */ 556 557 if (isdigit(*s)) 558 return strtol(s, end, base); 559 560 /* 561 * find separator. '\\' escapes the next char. 562 */ 563 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 564 if (*s1 == '\\' && s1[1] != '\0') 565 s1++; 566 567 buf = safe_calloc(s1 - s + 1, 1); 568 569 /* 570 * copy into a buffer skipping backslashes 571 */ 572 for (p = s, i = 0; p != s1 ; p++) 573 if (*p != '\\') 574 buf[i++] = *p; 575 buf[i++] = '\0'; 576 577 if (proto == IPPROTO_ETHERTYPE) { 578 i = match_token(ether_types, buf); 579 free(buf); 580 if (i != -1) { /* found */ 581 *end = s1; 582 return i; 583 } 584 } else { 585 struct protoent *pe = NULL; 586 struct servent *se; 587 588 if (proto != 0) 589 pe = getprotobynumber(proto); 590 setservent(1); 591 se = getservbyname(buf, pe ? pe->p_name : NULL); 592 free(buf); 593 if (se != NULL) { 594 *end = s1; 595 return ntohs(se->s_port); 596 } 597 } 598 return 0; /* not found */ 599} 600 601/* 602 * Fill the body of the command with the list of port ranges. 603 */ 604static int 605fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 606{ 607 uint16_t a, b, *p = cmd->ports; 608 int i = 0; 609 char *s = av; 610 611 while (*s) { 612 a = strtoport(av, &s, 0, proto); 613 if (s == av) /* empty or invalid argument */ 614 return (0); 615 616 switch (*s) { 617 case '-': /* a range */ 618 av = s + 1; 619 b = strtoport(av, &s, 0, proto); 620 /* Reject expressions like '1-abc' or '1-2-3'. */ 621 if (s == av || (*s != ',' && *s != '\0')) 622 return (0); 623 p[0] = a; 624 p[1] = b; 625 break; 626 case ',': /* comma separated list */ 627 case '\0': 628 p[0] = p[1] = a; 629 break; 630 default: 631 warnx("port list: invalid separator <%c> in <%s>", 632 *s, av); 633 return (0); 634 } 635 636 i++; 637 p += 2; 638 av = s + 1; 639 } 640 if (i > 0) { 641 if (i + 1 > F_LEN_MASK) 642 errx(EX_DATAERR, "too many ports/ranges\n"); 643 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 644 } 645 return (i); 646} 647 648static struct _s_x icmpcodes[] = { 649 { "net", ICMP_UNREACH_NET }, 650 { "host", ICMP_UNREACH_HOST }, 651 { "protocol", ICMP_UNREACH_PROTOCOL }, 652 { "port", ICMP_UNREACH_PORT }, 653 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 654 { "srcfail", ICMP_UNREACH_SRCFAIL }, 655 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 656 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 657 { "isolated", ICMP_UNREACH_ISOLATED }, 658 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 659 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 660 { "tosnet", ICMP_UNREACH_TOSNET }, 661 { "toshost", ICMP_UNREACH_TOSHOST }, 662 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 663 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 664 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 665 { NULL, 0 } 666}; 667 668static void 669fill_reject_code(u_short *codep, char *str) 670{ 671 int val; 672 char *s; 673 674 val = strtoul(str, &s, 0); 675 if (s == str || *s != '\0' || val >= 0x100) 676 val = match_token(icmpcodes, str); 677 if (val < 0) 678 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 679 *codep = val; 680 return; 681} 682 683static void 684print_reject_code(uint16_t code) 685{ 686 char const *s = match_value(icmpcodes, code); 687 688 if (s != NULL) 689 printf("unreach %s", s); 690 else 691 printf("unreach %u", code); 692} 693 694/* 695 * Returns the number of bits set (from left) in a contiguous bitmask, 696 * or -1 if the mask is not contiguous. 697 * XXX this needs a proper fix. 698 * This effectively works on masks in big-endian (network) format. 699 * when compiled on little endian architectures. 700 * 701 * First bit is bit 7 of the first byte -- note, for MAC addresses, 702 * the first bit on the wire is bit 0 of the first byte. 703 * len is the max length in bits. 704 */ 705int 706contigmask(uint8_t *p, int len) 707{ 708 int i, n; 709 710 for (i=0; i<len ; i++) 711 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 712 break; 713 for (n=i+1; n < len; n++) 714 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 715 return -1; /* mask not contiguous */ 716 return i; 717} 718 719/* 720 * print flags set/clear in the two bitmasks passed as parameters. 721 * There is a specialized check for f_tcpflags. 722 */ 723static void 724print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 725{ 726 char const *comma = ""; 727 int i; 728 uint8_t set = cmd->arg1 & 0xff; 729 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 730 731 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 732 printf(" setup"); 733 return; 734 } 735 736 printf(" %s ", name); 737 for (i=0; list[i].x != 0; i++) { 738 if (set & list[i].x) { 739 set &= ~list[i].x; 740 printf("%s%s", comma, list[i].s); 741 comma = ","; 742 } 743 if (clear & list[i].x) { 744 clear &= ~list[i].x; 745 printf("%s!%s", comma, list[i].s); 746 comma = ","; 747 } 748 } 749} 750 751/* 752 * Print the ip address contained in a command. 753 */ 754static void 755print_ip(ipfw_insn_ip *cmd, char const *s) 756{ 757 struct hostent *he = NULL; 758 uint32_t len = F_LEN((ipfw_insn *)cmd); 759 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 760 761 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 762 uint32_t d = a[1]; 763 const char *arg = "<invalid>"; 764 765 if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) 766 arg = match_value(rule_options, lookup_key[d]); 767 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "", 768 arg, cmd->o.arg1); 769 return; 770 } 771 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 772 773 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 774 printf("me"); 775 return; 776 } 777 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 778 cmd->o.opcode == O_IP_DST_LOOKUP) { 779 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 780 if (len == F_INSN_SIZE(ipfw_insn_u32)) 781 printf(",%u", *a); 782 printf(")"); 783 return; 784 } 785 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 786 uint32_t x, *map = (uint32_t *)&(cmd->mask); 787 int i, j; 788 char comma = '{'; 789 790 x = cmd->o.arg1 - 1; 791 x = htonl( ~x ); 792 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 793 printf("%s/%d", inet_ntoa(cmd->addr), 794 contigmask((uint8_t *)&x, 32)); 795 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 796 x &= 0xff; /* base */ 797 /* 798 * Print bits and ranges. 799 * Locate first bit set (i), then locate first bit unset (j). 800 * If we have 3+ consecutive bits set, then print them as a 801 * range, otherwise only print the initial bit and rescan. 802 */ 803 for (i=0; i < cmd->o.arg1; i++) 804 if (map[i/32] & (1<<(i & 31))) { 805 for (j=i+1; j < cmd->o.arg1; j++) 806 if (!(map[ j/32] & (1<<(j & 31)))) 807 break; 808 printf("%c%d", comma, i+x); 809 if (j>i+2) { /* range has at least 3 elements */ 810 printf("-%d", j-1+x); 811 i = j-1; 812 } 813 comma = ','; 814 } 815 printf("}"); 816 return; 817 } 818 /* 819 * len == 2 indicates a single IP, whereas lists of 1 or more 820 * addr/mask pairs have len = (2n+1). We convert len to n so we 821 * use that to count the number of entries. 822 */ 823 for (len = len / 2; len > 0; len--, a += 2) { 824 int mb = /* mask length */ 825 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 826 32 : contigmask((uint8_t *)&(a[1]), 32); 827 if (mb == 32 && co.do_resolv) 828 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 829 if (he != NULL) /* resolved to name */ 830 printf("%s", he->h_name); 831 else if (mb == 0) /* any */ 832 printf("any"); 833 else { /* numeric IP followed by some kind of mask */ 834 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 835 if (mb < 0) 836 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 837 else if (mb < 32) 838 printf("/%d", mb); 839 } 840 if (len > 1) 841 printf(","); 842 } 843} 844 845/* 846 * prints a MAC address/mask pair 847 */ 848static void 849print_mac(uint8_t *addr, uint8_t *mask) 850{ 851 int l = contigmask(mask, 48); 852 853 if (l == 0) 854 printf(" any"); 855 else { 856 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 857 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 858 if (l == -1) 859 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 860 mask[0], mask[1], mask[2], 861 mask[3], mask[4], mask[5]); 862 else if (l < 48) 863 printf("/%d", l); 864 } 865} 866 867static void 868fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 869{ 870 uint8_t type; 871 872 cmd->d[0] = 0; 873 while (*av) { 874 if (*av == ',') 875 av++; 876 877 type = strtoul(av, &av, 0); 878 879 if (*av != ',' && *av != '\0') 880 errx(EX_DATAERR, "invalid ICMP type"); 881 882 if (type > 31) 883 errx(EX_DATAERR, "ICMP type out of range"); 884 885 cmd->d[0] |= 1 << type; 886 } 887 cmd->o.opcode = O_ICMPTYPE; 888 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 889} 890 891static void 892print_icmptypes(ipfw_insn_u32 *cmd) 893{ 894 int i; 895 char sep= ' '; 896 897 printf(" icmptypes"); 898 for (i = 0; i < 32; i++) { 899 if ( (cmd->d[0] & (1 << (i))) == 0) 900 continue; 901 printf("%c%d", sep, i); 902 sep = ','; 903 } 904} 905 906/* 907 * show_ipfw() prints the body of an ipfw rule. 908 * Because the standard rule has at least proto src_ip dst_ip, we use 909 * a helper function to produce these entries if not provided explicitly. 910 * The first argument is the list of fields we have, the second is 911 * the list of fields we want to be printed. 912 * 913 * Special cases if we have provided a MAC header: 914 * + if the rule does not contain IP addresses/ports, do not print them; 915 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 916 * 917 * Once we have 'have_options', IP header fields are printed as options. 918 */ 919#define HAVE_PROTO 0x0001 920#define HAVE_SRCIP 0x0002 921#define HAVE_DSTIP 0x0004 922#define HAVE_PROTO4 0x0008 923#define HAVE_PROTO6 0x0010 924#define HAVE_IP 0x0100 925#define HAVE_OPTIONS 0x8000 926 927static void 928show_prerequisites(int *flags, int want, int cmd __unused) 929{ 930 if (co.comment_only) 931 return; 932 if ( (*flags & HAVE_IP) == HAVE_IP) 933 *flags |= HAVE_OPTIONS; 934 935 if ( !(*flags & HAVE_OPTIONS)) { 936 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 937 if ( (*flags & HAVE_PROTO4)) 938 printf(" ip4"); 939 else if ( (*flags & HAVE_PROTO6)) 940 printf(" ip6"); 941 else 942 printf(" ip"); 943 } 944 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 945 printf(" from any"); 946 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 947 printf(" to any"); 948 } 949 *flags |= want; 950} 951 952static void 953show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 954{ 955 static int twidth = 0; 956 int l; 957 ipfw_insn *cmd, *tagptr = NULL; 958 const char *comment = NULL; /* ptr to comment if we have one */ 959 int proto = 0; /* default */ 960 int flags = 0; /* prerequisites */ 961 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 962 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 963 int or_block = 0; /* we are in an or block */ 964 uint32_t set_disable; 965 966 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 967 968 if (set_disable & (1 << rule->set)) { /* disabled */ 969 if (!co.show_sets) 970 return; 971 else 972 printf("# DISABLED "); 973 } 974 printf("%05u ", rule->rulenum); 975 976 if (pcwidth>0 || bcwidth>0) 977 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 978 bcwidth, align_uint64(&rule->bcnt)); 979 980 if (co.do_time == 2) 981 printf("%10u ", rule->timestamp); 982 else if (co.do_time == 1) { 983 char timestr[30]; 984 time_t t = (time_t)0; 985 986 if (twidth == 0) { 987 strcpy(timestr, ctime(&t)); 988 *strchr(timestr, '\n') = '\0'; 989 twidth = strlen(timestr); 990 } 991 if (rule->timestamp) { 992 t = _long_to_time(rule->timestamp); 993 994 strcpy(timestr, ctime(&t)); 995 *strchr(timestr, '\n') = '\0'; 996 printf("%s ", timestr); 997 } else { 998 printf("%*s", twidth, " "); 999 } 1000 } 1001 1002 if (co.show_sets) 1003 printf("set %d ", rule->set); 1004 1005 /* 1006 * print the optional "match probability" 1007 */ 1008 if (rule->cmd_len > 0) { 1009 cmd = rule->cmd ; 1010 if (cmd->opcode == O_PROB) { 1011 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1012 double d = 1.0 * p->d[0]; 1013 1014 d = (d / 0x7fffffff); 1015 printf("prob %f ", d); 1016 } 1017 } 1018 1019 /* 1020 * first print actions 1021 */ 1022 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1023 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1024 switch(cmd->opcode) { 1025 case O_CHECK_STATE: 1026 printf("check-state"); 1027 /* avoid printing anything else */ 1028 flags = HAVE_PROTO | HAVE_SRCIP | 1029 HAVE_DSTIP | HAVE_IP; 1030 break; 1031 1032 case O_ACCEPT: 1033 printf("allow"); 1034 break; 1035 1036 case O_COUNT: 1037 printf("count"); 1038 break; 1039 1040 case O_DENY: 1041 printf("deny"); 1042 break; 1043 1044 case O_REJECT: 1045 if (cmd->arg1 == ICMP_REJECT_RST) 1046 printf("reset"); 1047 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1048 printf("reject"); 1049 else 1050 print_reject_code(cmd->arg1); 1051 break; 1052 1053 case O_UNREACH6: 1054 if (cmd->arg1 == ICMP6_UNREACH_RST) 1055 printf("reset6"); 1056 else 1057 print_unreach6_code(cmd->arg1); 1058 break; 1059 1060 case O_SKIPTO: 1061 PRINT_UINT_ARG("skipto ", cmd->arg1); 1062 break; 1063 1064 case O_PIPE: 1065 PRINT_UINT_ARG("pipe ", cmd->arg1); 1066 break; 1067 1068 case O_QUEUE: 1069 PRINT_UINT_ARG("queue ", cmd->arg1); 1070 break; 1071 1072 case O_DIVERT: 1073 PRINT_UINT_ARG("divert ", cmd->arg1); 1074 break; 1075 1076 case O_TEE: 1077 PRINT_UINT_ARG("tee ", cmd->arg1); 1078 break; 1079 1080 case O_NETGRAPH: 1081 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1082 break; 1083 1084 case O_NGTEE: 1085 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1086 break; 1087 1088 case O_FORWARD_IP: 1089 { 1090 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1091 1092 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1093 printf("fwd tablearg"); 1094 } else { 1095 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1096 } 1097 if (s->sa.sin_port) 1098 printf(",%d", s->sa.sin_port); 1099 } 1100 break; 1101 1102 case O_LOG: /* O_LOG is printed last */ 1103 logptr = (ipfw_insn_log *)cmd; 1104 break; 1105 1106 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1107 altqptr = (ipfw_insn_altq *)cmd; 1108 break; 1109 1110 case O_TAG: 1111 tagptr = cmd; 1112 break; 1113 1114 case O_NAT: 1115 PRINT_UINT_ARG("nat ", cmd->arg1); 1116 break; 1117 1118 case O_SETFIB: 1119 PRINT_UINT_ARG("setfib ", cmd->arg1); 1120 break; 1121 1122 case O_REASS: 1123 printf("reass"); 1124 break; 1125 1126 default: 1127 printf("** unrecognized action %d len %d ", 1128 cmd->opcode, cmd->len); 1129 } 1130 } 1131 if (logptr) { 1132 if (logptr->max_log > 0) 1133 printf(" log logamount %d", logptr->max_log); 1134 else 1135 printf(" log"); 1136 } 1137#ifndef NO_ALTQ 1138 if (altqptr) { 1139 print_altq_cmd(altqptr); 1140 } 1141#endif 1142 if (tagptr) { 1143 if (tagptr->len & F_NOT) 1144 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1145 else 1146 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1147 } 1148 1149 /* 1150 * then print the body. 1151 */ 1152 for (l = rule->act_ofs, cmd = rule->cmd ; 1153 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1154 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1155 continue; 1156 if (cmd->opcode == O_IP4) { 1157 flags |= HAVE_PROTO4; 1158 break; 1159 } else if (cmd->opcode == O_IP6) { 1160 flags |= HAVE_PROTO6; 1161 break; 1162 } 1163 } 1164 if (rule->_pad & 1) { /* empty rules before options */ 1165 if (!co.do_compact) { 1166 show_prerequisites(&flags, HAVE_PROTO, 0); 1167 printf(" from any to any"); 1168 } 1169 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | 1170 HAVE_SRCIP | HAVE_DSTIP; 1171 } 1172 1173 if (co.comment_only) 1174 comment = "..."; 1175 1176 for (l = rule->act_ofs, cmd = rule->cmd ; 1177 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1178 /* useful alias */ 1179 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1180 1181 if (co.comment_only) { 1182 if (cmd->opcode != O_NOP) 1183 continue; 1184 printf(" // %s\n", (char *)(cmd + 1)); 1185 return; 1186 } 1187 1188 show_prerequisites(&flags, 0, cmd->opcode); 1189 1190 switch(cmd->opcode) { 1191 case O_PROB: 1192 break; /* done already */ 1193 1194 case O_PROBE_STATE: 1195 break; /* no need to print anything here */ 1196 1197 case O_IP_SRC: 1198 case O_IP_SRC_LOOKUP: 1199 case O_IP_SRC_MASK: 1200 case O_IP_SRC_ME: 1201 case O_IP_SRC_SET: 1202 show_prerequisites(&flags, HAVE_PROTO, 0); 1203 if (!(flags & HAVE_SRCIP)) 1204 printf(" from"); 1205 if ((cmd->len & F_OR) && !or_block) 1206 printf(" {"); 1207 print_ip((ipfw_insn_ip *)cmd, 1208 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1209 flags |= HAVE_SRCIP; 1210 break; 1211 1212 case O_IP_DST: 1213 case O_IP_DST_LOOKUP: 1214 case O_IP_DST_MASK: 1215 case O_IP_DST_ME: 1216 case O_IP_DST_SET: 1217 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1218 if (!(flags & HAVE_DSTIP)) 1219 printf(" to"); 1220 if ((cmd->len & F_OR) && !or_block) 1221 printf(" {"); 1222 print_ip((ipfw_insn_ip *)cmd, 1223 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1224 flags |= HAVE_DSTIP; 1225 break; 1226 1227 case O_IP6_SRC: 1228 case O_IP6_SRC_MASK: 1229 case O_IP6_SRC_ME: 1230 show_prerequisites(&flags, HAVE_PROTO, 0); 1231 if (!(flags & HAVE_SRCIP)) 1232 printf(" from"); 1233 if ((cmd->len & F_OR) && !or_block) 1234 printf(" {"); 1235 print_ip6((ipfw_insn_ip6 *)cmd, 1236 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1237 flags |= HAVE_SRCIP | HAVE_PROTO; 1238 break; 1239 1240 case O_IP6_DST: 1241 case O_IP6_DST_MASK: 1242 case O_IP6_DST_ME: 1243 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1244 if (!(flags & HAVE_DSTIP)) 1245 printf(" to"); 1246 if ((cmd->len & F_OR) && !or_block) 1247 printf(" {"); 1248 print_ip6((ipfw_insn_ip6 *)cmd, 1249 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1250 flags |= HAVE_DSTIP; 1251 break; 1252 1253 case O_FLOW6ID: 1254 print_flow6id( (ipfw_insn_u32 *) cmd ); 1255 flags |= HAVE_OPTIONS; 1256 break; 1257 1258 case O_IP_DSTPORT: 1259 show_prerequisites(&flags, 1260 HAVE_PROTO | HAVE_SRCIP | 1261 HAVE_DSTIP | HAVE_IP, 0); 1262 case O_IP_SRCPORT: 1263 show_prerequisites(&flags, 1264 HAVE_PROTO | HAVE_SRCIP, 0); 1265 if ((cmd->len & F_OR) && !or_block) 1266 printf(" {"); 1267 if (cmd->len & F_NOT) 1268 printf(" not"); 1269 print_newports((ipfw_insn_u16 *)cmd, proto, 1270 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1271 break; 1272 1273 case O_PROTO: { 1274 struct protoent *pe = NULL; 1275 1276 if ((cmd->len & F_OR) && !or_block) 1277 printf(" {"); 1278 if (cmd->len & F_NOT) 1279 printf(" not"); 1280 proto = cmd->arg1; 1281 pe = getprotobynumber(cmd->arg1); 1282 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1283 !(flags & HAVE_PROTO)) 1284 show_prerequisites(&flags, 1285 HAVE_PROTO | HAVE_IP | HAVE_SRCIP | 1286 HAVE_DSTIP | HAVE_OPTIONS, 0); 1287 if (flags & HAVE_OPTIONS) 1288 printf(" proto"); 1289 if (pe) 1290 printf(" %s", pe->p_name); 1291 else 1292 printf(" %u", cmd->arg1); 1293 } 1294 flags |= HAVE_PROTO; 1295 break; 1296 1297 default: /*options ... */ 1298 if (!(cmd->len & (F_OR|F_NOT))) 1299 if (((cmd->opcode == O_IP6) && 1300 (flags & HAVE_PROTO6)) || 1301 ((cmd->opcode == O_IP4) && 1302 (flags & HAVE_PROTO4))) 1303 break; 1304 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | 1305 HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); 1306 if ((cmd->len & F_OR) && !or_block) 1307 printf(" {"); 1308 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1309 printf(" not"); 1310 switch(cmd->opcode) { 1311 case O_MACADDR2: { 1312 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1313 1314 printf(" MAC"); 1315 print_mac(m->addr, m->mask); 1316 print_mac(m->addr + 6, m->mask + 6); 1317 } 1318 break; 1319 1320 case O_MAC_TYPE: 1321 print_newports((ipfw_insn_u16 *)cmd, 1322 IPPROTO_ETHERTYPE, cmd->opcode); 1323 break; 1324 1325 1326 case O_FRAG: 1327 printf(" frag"); 1328 break; 1329 1330 case O_FIB: 1331 printf(" fib %u", cmd->arg1 ); 1332 break; 1333 1334 case O_IN: 1335 printf(cmd->len & F_NOT ? " out" : " in"); 1336 break; 1337 1338 case O_DIVERTED: 1339 switch (cmd->arg1) { 1340 case 3: 1341 printf(" diverted"); 1342 break; 1343 case 1: 1344 printf(" diverted-loopback"); 1345 break; 1346 case 2: 1347 printf(" diverted-output"); 1348 break; 1349 default: 1350 printf(" diverted-?<%u>", cmd->arg1); 1351 break; 1352 } 1353 break; 1354 1355 case O_LAYER2: 1356 printf(" layer2"); 1357 break; 1358 case O_XMIT: 1359 case O_RECV: 1360 case O_VIA: 1361 { 1362 char const *s; 1363 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1364 1365 if (cmd->opcode == O_XMIT) 1366 s = "xmit"; 1367 else if (cmd->opcode == O_RECV) 1368 s = "recv"; 1369 else /* if (cmd->opcode == O_VIA) */ 1370 s = "via"; 1371 if (cmdif->name[0] == '\0') 1372 printf(" %s %s", s, 1373 inet_ntoa(cmdif->p.ip)); 1374 else 1375 printf(" %s %s", s, cmdif->name); 1376 1377 break; 1378 } 1379 case O_IPID: 1380 if (F_LEN(cmd) == 1) 1381 printf(" ipid %u", cmd->arg1 ); 1382 else 1383 print_newports((ipfw_insn_u16 *)cmd, 0, 1384 O_IPID); 1385 break; 1386 1387 case O_IPTTL: 1388 if (F_LEN(cmd) == 1) 1389 printf(" ipttl %u", cmd->arg1 ); 1390 else 1391 print_newports((ipfw_insn_u16 *)cmd, 0, 1392 O_IPTTL); 1393 break; 1394 1395 case O_IPVER: 1396 printf(" ipver %u", cmd->arg1 ); 1397 break; 1398 1399 case O_IPPRECEDENCE: 1400 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1401 break; 1402 1403 case O_IPLEN: 1404 if (F_LEN(cmd) == 1) 1405 printf(" iplen %u", cmd->arg1 ); 1406 else 1407 print_newports((ipfw_insn_u16 *)cmd, 0, 1408 O_IPLEN); 1409 break; 1410 1411 case O_IPOPT: 1412 print_flags("ipoptions", cmd, f_ipopts); 1413 break; 1414 1415 case O_IPTOS: 1416 print_flags("iptos", cmd, f_iptos); 1417 break; 1418 1419 case O_ICMPTYPE: 1420 print_icmptypes((ipfw_insn_u32 *)cmd); 1421 break; 1422 1423 case O_ESTAB: 1424 printf(" established"); 1425 break; 1426 1427 case O_TCPDATALEN: 1428 if (F_LEN(cmd) == 1) 1429 printf(" tcpdatalen %u", cmd->arg1 ); 1430 else 1431 print_newports((ipfw_insn_u16 *)cmd, 0, 1432 O_TCPDATALEN); 1433 break; 1434 1435 case O_TCPFLAGS: 1436 print_flags("tcpflags", cmd, f_tcpflags); 1437 break; 1438 1439 case O_TCPOPTS: 1440 print_flags("tcpoptions", cmd, f_tcpopts); 1441 break; 1442 1443 case O_TCPWIN: 1444 printf(" tcpwin %d", ntohs(cmd->arg1)); 1445 break; 1446 1447 case O_TCPACK: 1448 printf(" tcpack %d", ntohl(cmd32->d[0])); 1449 break; 1450 1451 case O_TCPSEQ: 1452 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1453 break; 1454 1455 case O_UID: 1456 { 1457 struct passwd *pwd = getpwuid(cmd32->d[0]); 1458 1459 if (pwd) 1460 printf(" uid %s", pwd->pw_name); 1461 else 1462 printf(" uid %u", cmd32->d[0]); 1463 } 1464 break; 1465 1466 case O_GID: 1467 { 1468 struct group *grp = getgrgid(cmd32->d[0]); 1469 1470 if (grp) 1471 printf(" gid %s", grp->gr_name); 1472 else 1473 printf(" gid %u", cmd32->d[0]); 1474 } 1475 break; 1476 1477 case O_JAIL: 1478 printf(" jail %d", cmd32->d[0]); 1479 break; 1480 1481 case O_VERREVPATH: 1482 printf(" verrevpath"); 1483 break; 1484 1485 case O_VERSRCREACH: 1486 printf(" versrcreach"); 1487 break; 1488 1489 case O_ANTISPOOF: 1490 printf(" antispoof"); 1491 break; 1492 1493 case O_IPSEC: 1494 printf(" ipsec"); 1495 break; 1496 1497 case O_NOP: 1498 comment = (char *)(cmd + 1); 1499 break; 1500 1501 case O_KEEP_STATE: 1502 printf(" keep-state"); 1503 break; 1504 1505 case O_LIMIT: { 1506 struct _s_x *p = limit_masks; 1507 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1508 uint8_t x = c->limit_mask; 1509 char const *comma = " "; 1510 1511 printf(" limit"); 1512 for (; p->x != 0 ; p++) 1513 if ((x & p->x) == p->x) { 1514 x &= ~p->x; 1515 printf("%s%s", comma, p->s); 1516 comma = ","; 1517 } 1518 PRINT_UINT_ARG(" ", c->conn_limit); 1519 break; 1520 } 1521 1522 case O_IP6: 1523 printf(" ip6"); 1524 break; 1525 1526 case O_IP4: 1527 printf(" ip4"); 1528 break; 1529 1530 case O_ICMP6TYPE: 1531 print_icmp6types((ipfw_insn_u32 *)cmd); 1532 break; 1533 1534 case O_EXT_HDR: 1535 print_ext6hdr( (ipfw_insn *) cmd ); 1536 break; 1537 1538 case O_TAGGED: 1539 if (F_LEN(cmd) == 1) 1540 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1541 else 1542 print_newports((ipfw_insn_u16 *)cmd, 0, 1543 O_TAGGED); 1544 break; 1545 1546 default: 1547 printf(" [opcode %d len %d]", 1548 cmd->opcode, cmd->len); 1549 } 1550 } 1551 if (cmd->len & F_OR) { 1552 printf(" or"); 1553 or_block = 1; 1554 } else if (or_block) { 1555 printf(" }"); 1556 or_block = 0; 1557 } 1558 } 1559 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP 1560 | HAVE_IP, 0); 1561 if (comment) 1562 printf(" // %s", comment); 1563 printf("\n"); 1564} 1565 1566static void 1567show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1568{ 1569 struct protoent *pe; 1570 struct in_addr a; 1571 uint16_t rulenum; 1572 char buf[INET6_ADDRSTRLEN]; 1573 1574 if (!co.do_expired) { 1575 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1576 return; 1577 } 1578 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1579 printf("%05d", rulenum); 1580 if (pcwidth>0 || bcwidth>0) 1581 printf(" %*llu %*llu (%ds)", pcwidth, 1582 align_uint64(&d->pcnt), bcwidth, 1583 align_uint64(&d->bcnt), d->expire); 1584 switch (d->dyn_type) { 1585 case O_LIMIT_PARENT: 1586 printf(" PARENT %d", d->count); 1587 break; 1588 case O_LIMIT: 1589 printf(" LIMIT"); 1590 break; 1591 case O_KEEP_STATE: /* bidir, no mask */ 1592 printf(" STATE"); 1593 break; 1594 } 1595 1596 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1597 printf(" %s", pe->p_name); 1598 else 1599 printf(" proto %u", d->id.proto); 1600 1601 if (d->id.addr_type == 4) { 1602 a.s_addr = htonl(d->id.src_ip); 1603 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1604 1605 a.s_addr = htonl(d->id.dst_ip); 1606 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1607 } else if (d->id.addr_type == 6) { 1608 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1609 sizeof(buf)), d->id.src_port); 1610 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1611 sizeof(buf)), d->id.dst_port); 1612 } else 1613 printf(" UNKNOWN <-> UNKNOWN\n"); 1614 1615 printf("\n"); 1616} 1617 1618/* 1619 * This one handles all set-related commands 1620 * ipfw set { show | enable | disable } 1621 * ipfw set swap X Y 1622 * ipfw set move X to Y 1623 * ipfw set move rule X to Y 1624 */ 1625void 1626ipfw_sets_handler(char *av[]) 1627{ 1628 uint32_t set_disable, masks[2]; 1629 int i, nbytes; 1630 uint16_t rulenum; 1631 uint8_t cmd, new_set; 1632 1633 av++; 1634 1635 if (av[0] == NULL) 1636 errx(EX_USAGE, "set needs command"); 1637 if (_substrcmp(*av, "show") == 0) { 1638 void *data = NULL; 1639 char const *msg; 1640 int nalloc; 1641 1642 nalloc = nbytes = sizeof(struct ip_fw); 1643 while (nbytes >= nalloc) { 1644 if (data) 1645 free(data); 1646 nalloc = nalloc * 2 + 200; 1647 nbytes = nalloc; 1648 data = safe_calloc(1, nbytes); 1649 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1650 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1651 } 1652 1653 bcopy(&((struct ip_fw *)data)->next_rule, 1654 &set_disable, sizeof(set_disable)); 1655 1656 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1657 if ((set_disable & (1<<i))) { 1658 printf("%s %d", msg, i); 1659 msg = ""; 1660 } 1661 msg = (set_disable) ? " enable" : "enable"; 1662 for (i = 0; i < RESVD_SET; i++) 1663 if (!(set_disable & (1<<i))) { 1664 printf("%s %d", msg, i); 1665 msg = ""; 1666 } 1667 printf("\n"); 1668 } else if (_substrcmp(*av, "swap") == 0) { 1669 av++; 1670 if ( av[0] == NULL || av[1] == NULL ) 1671 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1672 rulenum = atoi(av[0]); 1673 new_set = atoi(av[1]); 1674 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1675 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1676 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1677 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1678 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1679 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1680 } else if (_substrcmp(*av, "move") == 0) { 1681 av++; 1682 if (av[0] && _substrcmp(*av, "rule") == 0) { 1683 cmd = 2; 1684 av++; 1685 } else 1686 cmd = 3; 1687 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 1688 av[3] != NULL || _substrcmp(av[1], "to") != 0) 1689 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1690 rulenum = atoi(av[0]); 1691 new_set = atoi(av[2]); 1692 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1693 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1694 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1695 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1696 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1697 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1698 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1699 } else if (_substrcmp(*av, "disable") == 0 || 1700 _substrcmp(*av, "enable") == 0 ) { 1701 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1702 1703 av++; 1704 masks[0] = masks[1] = 0; 1705 1706 while (av[0]) { 1707 if (isdigit(**av)) { 1708 i = atoi(*av); 1709 if (i < 0 || i > RESVD_SET) 1710 errx(EX_DATAERR, 1711 "invalid set number %d\n", i); 1712 masks[which] |= (1<<i); 1713 } else if (_substrcmp(*av, "disable") == 0) 1714 which = 0; 1715 else if (_substrcmp(*av, "enable") == 0) 1716 which = 1; 1717 else 1718 errx(EX_DATAERR, 1719 "invalid set command %s\n", *av); 1720 av++; 1721 } 1722 if ( (masks[0] & masks[1]) != 0 ) 1723 errx(EX_DATAERR, 1724 "cannot enable and disable the same set\n"); 1725 1726 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1727 if (i) 1728 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1729 } else 1730 errx(EX_USAGE, "invalid set command %s\n", *av); 1731} 1732 1733void 1734ipfw_sysctl_handler(char *av[], int which) 1735{ 1736 av++; 1737 1738 if (av[0] == NULL) { 1739 warnx("missing keyword to enable/disable\n"); 1740 } else if (_substrcmp(*av, "firewall") == 0) { 1741 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1742 &which, sizeof(which)); 1743 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 1744 &which, sizeof(which)); 1745 } else if (_substrcmp(*av, "one_pass") == 0) { 1746 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1747 &which, sizeof(which)); 1748 } else if (_substrcmp(*av, "debug") == 0) { 1749 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1750 &which, sizeof(which)); 1751 } else if (_substrcmp(*av, "verbose") == 0) { 1752 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1753 &which, sizeof(which)); 1754 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1755 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1756 &which, sizeof(which)); 1757#ifndef NO_ALTQ 1758 } else if (_substrcmp(*av, "altq") == 0) { 1759 altq_set_enabled(which); 1760#endif 1761 } else { 1762 warnx("unrecognize enable/disable keyword: %s\n", *av); 1763 } 1764} 1765 1766void 1767ipfw_list(int ac, char *av[], int show_counters) 1768{ 1769 struct ip_fw *r; 1770 ipfw_dyn_rule *dynrules, *d; 1771 1772#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1773 char *lim; 1774 void *data = NULL; 1775 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1776 int exitval = EX_OK; 1777 int lac; 1778 char **lav; 1779 u_long rnum, last; 1780 char *endptr; 1781 int seen = 0; 1782 uint8_t set; 1783 1784 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1785 int nalloc = 1024; /* start somewhere... */ 1786 1787 last = 0; 1788 1789 if (co.test_only) { 1790 fprintf(stderr, "Testing only, list disabled\n"); 1791 return; 1792 } 1793 if (co.do_pipe) { 1794 dummynet_list(ac, av, show_counters); 1795 return; 1796 } 1797 1798 ac--; 1799 av++; 1800 1801 /* get rules or pipes from kernel, resizing array as necessary */ 1802 nbytes = nalloc; 1803 1804 while (nbytes >= nalloc) { 1805 nalloc = nalloc * 2 + 200; 1806 nbytes = nalloc; 1807 data = safe_realloc(data, nbytes); 1808 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1809 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1810 co.do_pipe ? "DUMMYNET" : "FW"); 1811 } 1812 1813 /* 1814 * Count static rules. They have variable size so we 1815 * need to scan the list to count them. 1816 */ 1817 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1818 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1819 ++nstat, r = NEXT(r) ) 1820 ; /* nothing */ 1821 1822 /* 1823 * Count dynamic rules. This is easier as they have 1824 * fixed size. 1825 */ 1826 r = NEXT(r); 1827 dynrules = (ipfw_dyn_rule *)r ; 1828 n = (char *)r - (char *)data; 1829 ndyn = (nbytes - n) / sizeof *dynrules; 1830 1831 /* if showing stats, figure out column widths ahead of time */ 1832 bcwidth = pcwidth = 0; 1833 if (show_counters) { 1834 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1835 /* skip rules from another set */ 1836 if (co.use_set && r->set != co.use_set - 1) 1837 continue; 1838 1839 /* packet counter */ 1840 width = snprintf(NULL, 0, "%llu", 1841 align_uint64(&r->pcnt)); 1842 if (width > pcwidth) 1843 pcwidth = width; 1844 1845 /* byte counter */ 1846 width = snprintf(NULL, 0, "%llu", 1847 align_uint64(&r->bcnt)); 1848 if (width > bcwidth) 1849 bcwidth = width; 1850 } 1851 } 1852 if (co.do_dynamic && ndyn) { 1853 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1854 if (co.use_set) { 1855 /* skip rules from another set */ 1856 bcopy((char *)&d->rule + sizeof(uint16_t), 1857 &set, sizeof(uint8_t)); 1858 if (set != co.use_set - 1) 1859 continue; 1860 } 1861 width = snprintf(NULL, 0, "%llu", 1862 align_uint64(&d->pcnt)); 1863 if (width > pcwidth) 1864 pcwidth = width; 1865 1866 width = snprintf(NULL, 0, "%llu", 1867 align_uint64(&d->bcnt)); 1868 if (width > bcwidth) 1869 bcwidth = width; 1870 } 1871 } 1872 /* if no rule numbers were specified, list all rules */ 1873 if (ac == 0) { 1874 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1875 if (co.use_set && r->set != co.use_set - 1) 1876 continue; 1877 show_ipfw(r, pcwidth, bcwidth); 1878 } 1879 1880 if (co.do_dynamic && ndyn) { 1881 printf("## Dynamic rules (%d):\n", ndyn); 1882 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1883 if (co.use_set) { 1884 bcopy((char *)&d->rule + sizeof(uint16_t), 1885 &set, sizeof(uint8_t)); 1886 if (set != co.use_set - 1) 1887 continue; 1888 } 1889 show_dyn_ipfw(d, pcwidth, bcwidth); 1890 } 1891 } 1892 goto done; 1893 } 1894 1895 /* display specific rules requested on command line */ 1896 1897 for (lac = ac, lav = av; lac != 0; lac--) { 1898 /* convert command line rule # */ 1899 last = rnum = strtoul(*lav++, &endptr, 10); 1900 if (*endptr == '-') 1901 last = strtoul(endptr+1, &endptr, 10); 1902 if (*endptr) { 1903 exitval = EX_USAGE; 1904 warnx("invalid rule number: %s", *(lav - 1)); 1905 continue; 1906 } 1907 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1908 if (r->rulenum > last) 1909 break; 1910 if (co.use_set && r->set != co.use_set - 1) 1911 continue; 1912 if (r->rulenum >= rnum && r->rulenum <= last) { 1913 show_ipfw(r, pcwidth, bcwidth); 1914 seen = 1; 1915 } 1916 } 1917 if (!seen) { 1918 /* give precedence to other error(s) */ 1919 if (exitval == EX_OK) 1920 exitval = EX_UNAVAILABLE; 1921 warnx("rule %lu does not exist", rnum); 1922 } 1923 } 1924 1925 if (co.do_dynamic && ndyn) { 1926 printf("## Dynamic rules:\n"); 1927 for (lac = ac, lav = av; lac != 0; lac--) { 1928 last = rnum = strtoul(*lav++, &endptr, 10); 1929 if (*endptr == '-') 1930 last = strtoul(endptr+1, &endptr, 10); 1931 if (*endptr) 1932 /* already warned */ 1933 continue; 1934 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1935 uint16_t rulenum; 1936 1937 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1938 if (rulenum > rnum) 1939 break; 1940 if (co.use_set) { 1941 bcopy((char *)&d->rule + sizeof(uint16_t), 1942 &set, sizeof(uint8_t)); 1943 if (set != co.use_set - 1) 1944 continue; 1945 } 1946 if (r->rulenum >= rnum && r->rulenum <= last) 1947 show_dyn_ipfw(d, pcwidth, bcwidth); 1948 } 1949 } 1950 } 1951 1952 ac = 0; 1953 1954done: 1955 free(data); 1956 1957 if (exitval != EX_OK) 1958 exit(exitval); 1959#undef NEXT 1960} 1961 1962static int 1963lookup_host (char *host, struct in_addr *ipaddr) 1964{ 1965 struct hostent *he; 1966 1967 if (!inet_aton(host, ipaddr)) { 1968 if ((he = gethostbyname(host)) == NULL) 1969 return(-1); 1970 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1971 } 1972 return(0); 1973} 1974 1975/* 1976 * fills the addr and mask fields in the instruction as appropriate from av. 1977 * Update length as appropriate. 1978 * The following formats are allowed: 1979 * me returns O_IP_*_ME 1980 * 1.2.3.4 single IP address 1981 * 1.2.3.4:5.6.7.8 address:mask 1982 * 1.2.3.4/24 address/mask 1983 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1984 * We can have multiple comma-separated address/mask entries. 1985 */ 1986static void 1987fill_ip(ipfw_insn_ip *cmd, char *av) 1988{ 1989 int len = 0; 1990 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1991 1992 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1993 1994 if (_substrcmp(av, "any") == 0) 1995 return; 1996 1997 if (_substrcmp(av, "me") == 0) { 1998 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1999 return; 2000 } 2001 2002 if (strncmp(av, "table(", 6) == 0) { 2003 char *p = strchr(av + 6, ','); 2004 2005 if (p) 2006 *p++ = '\0'; 2007 cmd->o.opcode = O_IP_DST_LOOKUP; 2008 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 2009 if (p) { 2010 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2011 d[0] = strtoul(p, NULL, 0); 2012 } else 2013 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2014 return; 2015 } 2016 2017 while (av) { 2018 /* 2019 * After the address we can have '/' or ':' indicating a mask, 2020 * ',' indicating another address follows, '{' indicating a 2021 * set of addresses of unspecified size. 2022 */ 2023 char *t = NULL, *p = strpbrk(av, "/:,{"); 2024 int masklen; 2025 char md, nd = '\0'; 2026 2027 if (p) { 2028 md = *p; 2029 *p++ = '\0'; 2030 if ((t = strpbrk(p, ",{")) != NULL) { 2031 nd = *t; 2032 *t = '\0'; 2033 } 2034 } else 2035 md = '\0'; 2036 2037 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2038 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2039 switch (md) { 2040 case ':': 2041 if (!inet_aton(p, (struct in_addr *)&d[1])) 2042 errx(EX_DATAERR, "bad netmask ``%s''", p); 2043 break; 2044 case '/': 2045 masklen = atoi(p); 2046 if (masklen == 0) 2047 d[1] = htonl(0); /* mask */ 2048 else if (masklen > 32) 2049 errx(EX_DATAERR, "bad width ``%s''", p); 2050 else 2051 d[1] = htonl(~0 << (32 - masklen)); 2052 break; 2053 case '{': /* no mask, assume /24 and put back the '{' */ 2054 d[1] = htonl(~0 << (32 - 24)); 2055 *(--p) = md; 2056 break; 2057 2058 case ',': /* single address plus continuation */ 2059 *(--p) = md; 2060 /* FALLTHROUGH */ 2061 case 0: /* initialization value */ 2062 default: 2063 d[1] = htonl(~0); /* force /32 */ 2064 break; 2065 } 2066 d[0] &= d[1]; /* mask base address with mask */ 2067 if (t) 2068 *t = nd; 2069 /* find next separator */ 2070 if (p) 2071 p = strpbrk(p, ",{"); 2072 if (p && *p == '{') { 2073 /* 2074 * We have a set of addresses. They are stored as follows: 2075 * arg1 is the set size (powers of 2, 2..256) 2076 * addr is the base address IN HOST FORMAT 2077 * mask.. is an array of arg1 bits (rounded up to 2078 * the next multiple of 32) with bits set 2079 * for each host in the map. 2080 */ 2081 uint32_t *map = (uint32_t *)&cmd->mask; 2082 int low, high; 2083 int i = contigmask((uint8_t *)&(d[1]), 32); 2084 2085 if (len > 0) 2086 errx(EX_DATAERR, "address set cannot be in a list"); 2087 if (i < 24 || i > 31) 2088 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2089 cmd->o.arg1 = 1<<(32-i); /* map length */ 2090 d[0] = ntohl(d[0]); /* base addr in host format */ 2091 cmd->o.opcode = O_IP_DST_SET; /* default */ 2092 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2093 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2094 map[i] = 0; /* clear map */ 2095 2096 av = p + 1; 2097 low = d[0] & 0xff; 2098 high = low + cmd->o.arg1 - 1; 2099 /* 2100 * Here, i stores the previous value when we specify a range 2101 * of addresses within a mask, e.g. 45-63. i = -1 means we 2102 * have no previous value. 2103 */ 2104 i = -1; /* previous value in a range */ 2105 while (isdigit(*av)) { 2106 char *s; 2107 int a = strtol(av, &s, 0); 2108 2109 if (s == av) { /* no parameter */ 2110 if (*av != '}') 2111 errx(EX_DATAERR, "set not closed\n"); 2112 if (i != -1) 2113 errx(EX_DATAERR, "incomplete range %d-", i); 2114 break; 2115 } 2116 if (a < low || a > high) 2117 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2118 a, low, high); 2119 a -= low; 2120 if (i == -1) /* no previous in range */ 2121 i = a; 2122 else { /* check that range is valid */ 2123 if (i > a) 2124 errx(EX_DATAERR, "invalid range %d-%d", 2125 i+low, a+low); 2126 if (*s == '-') 2127 errx(EX_DATAERR, "double '-' in range"); 2128 } 2129 for (; i <= a; i++) 2130 map[i/32] |= 1<<(i & 31); 2131 i = -1; 2132 if (*s == '-') 2133 i = a; 2134 else if (*s == '}') 2135 break; 2136 av = s+1; 2137 } 2138 return; 2139 } 2140 av = p; 2141 if (av) /* then *av must be a ',' */ 2142 av++; 2143 2144 /* Check this entry */ 2145 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2146 /* 2147 * 'any' turns the entire list into a NOP. 2148 * 'not any' never matches, so it is removed from the 2149 * list unless it is the only item, in which case we 2150 * report an error. 2151 */ 2152 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2153 if (av == NULL && len == 0) /* only this entry */ 2154 errx(EX_DATAERR, "not any never matches"); 2155 } 2156 /* else do nothing and skip this entry */ 2157 return; 2158 } 2159 /* A single IP can be stored in an optimized format */ 2160 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2161 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2162 return; 2163 } 2164 len += 2; /* two words... */ 2165 d += 2; 2166 } /* end while */ 2167 if (len + 1 > F_LEN_MASK) 2168 errx(EX_DATAERR, "address list too long"); 2169 cmd->o.len |= len+1; 2170} 2171 2172 2173/* n2mask sets n bits of the mask */ 2174void 2175n2mask(struct in6_addr *mask, int n) 2176{ 2177 static int minimask[9] = 2178 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2179 u_char *p; 2180 2181 memset(mask, 0, sizeof(struct in6_addr)); 2182 p = (u_char *) mask; 2183 for (; n > 0; p++, n -= 8) { 2184 if (n >= 8) 2185 *p = 0xff; 2186 else 2187 *p = minimask[n]; 2188 } 2189 return; 2190} 2191 2192 2193/* 2194 * helper function to process a set of flags and set bits in the 2195 * appropriate masks. 2196 */ 2197static void 2198fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2199 struct _s_x *flags, char *p) 2200{ 2201 uint8_t set=0, clear=0; 2202 2203 while (p && *p) { 2204 char *q; /* points to the separator */ 2205 int val; 2206 uint8_t *which; /* mask we are working on */ 2207 2208 if (*p == '!') { 2209 p++; 2210 which = &clear; 2211 } else 2212 which = &set; 2213 q = strchr(p, ','); 2214 if (q) 2215 *q++ = '\0'; 2216 val = match_token(flags, p); 2217 if (val <= 0) 2218 errx(EX_DATAERR, "invalid flag %s", p); 2219 *which |= (uint8_t)val; 2220 p = q; 2221 } 2222 cmd->opcode = opcode; 2223 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2224 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2225} 2226 2227 2228void 2229ipfw_delete(char *av[]) 2230{ 2231 uint32_t rulenum; 2232 int i; 2233 int exitval = EX_OK; 2234 int do_set = 0; 2235 2236 av++; 2237 NEED1("missing rule specification"); 2238 if ( *av && _substrcmp(*av, "set") == 0) { 2239 /* Do not allow using the following syntax: 2240 * ipfw set N delete set M 2241 */ 2242 if (co.use_set) 2243 errx(EX_DATAERR, "invalid syntax"); 2244 do_set = 1; /* delete set */ 2245 av++; 2246 } 2247 2248 /* Rule number */ 2249 while (*av && isdigit(**av)) { 2250 i = atoi(*av); av++; 2251 if (co.do_nat) { 2252 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2253 if (exitval) { 2254 exitval = EX_UNAVAILABLE; 2255 warn("rule %u not available", i); 2256 } 2257 } else if (co.do_pipe) { 2258 exitval = ipfw_delete_pipe(co.do_pipe, i); 2259 } else { 2260 if (co.use_set) 2261 rulenum = (i & 0xffff) | (5 << 24) | 2262 ((co.use_set - 1) << 16); 2263 else 2264 rulenum = (i & 0xffff) | (do_set << 24); 2265 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2266 if (i) { 2267 exitval = EX_UNAVAILABLE; 2268 warn("rule %u: setsockopt(IP_FW_DEL)", 2269 rulenum); 2270 } 2271 } 2272 } 2273 if (exitval != EX_OK) 2274 exit(exitval); 2275} 2276 2277 2278/* 2279 * fill the interface structure. We do not check the name as we can 2280 * create interfaces dynamically, so checking them at insert time 2281 * makes relatively little sense. 2282 * Interface names containing '*', '?', or '[' are assumed to be shell 2283 * patterns which match interfaces. 2284 */ 2285static void 2286fill_iface(ipfw_insn_if *cmd, char *arg) 2287{ 2288 cmd->name[0] = '\0'; 2289 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2290 2291 /* Parse the interface or address */ 2292 if (strcmp(arg, "any") == 0) 2293 cmd->o.len = 0; /* effectively ignore this command */ 2294 else if (!isdigit(*arg)) { 2295 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2296 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2297 } else if (!inet_aton(arg, &cmd->p.ip)) 2298 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2299} 2300 2301static void 2302get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2303{ 2304 int i; 2305 size_t l; 2306 char *ap, *ptr, *optr; 2307 struct ether_addr *mac; 2308 const char *macset = "0123456789abcdefABCDEF:"; 2309 2310 if (strcmp(p, "any") == 0) { 2311 for (i = 0; i < ETHER_ADDR_LEN; i++) 2312 addr[i] = mask[i] = 0; 2313 return; 2314 } 2315 2316 optr = ptr = strdup(p); 2317 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2318 l = strlen(ap); 2319 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2320 errx(EX_DATAERR, "Incorrect MAC address"); 2321 bcopy(mac, addr, ETHER_ADDR_LEN); 2322 } else 2323 errx(EX_DATAERR, "Incorrect MAC address"); 2324 2325 if (ptr != NULL) { /* we have mask? */ 2326 if (p[ptr - optr - 1] == '/') { /* mask len */ 2327 long ml = strtol(ptr, &ap, 10); 2328 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 2329 errx(EX_DATAERR, "Incorrect mask length"); 2330 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 2331 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 2332 } else { /* mask */ 2333 l = strlen(ptr); 2334 if (strspn(ptr, macset) != l || 2335 (mac = ether_aton(ptr)) == NULL) 2336 errx(EX_DATAERR, "Incorrect mask"); 2337 bcopy(mac, mask, ETHER_ADDR_LEN); 2338 } 2339 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2340 for (i = 0; i < ETHER_ADDR_LEN; i++) 2341 mask[i] = 0xff; 2342 } 2343 for (i = 0; i < ETHER_ADDR_LEN; i++) 2344 addr[i] &= mask[i]; 2345 2346 free(optr); 2347} 2348 2349/* 2350 * helper function, updates the pointer to cmd with the length 2351 * of the current command, and also cleans up the first word of 2352 * the new command in case it has been clobbered before. 2353 */ 2354static ipfw_insn * 2355next_cmd(ipfw_insn *cmd) 2356{ 2357 cmd += F_LEN(cmd); 2358 bzero(cmd, sizeof(*cmd)); 2359 return cmd; 2360} 2361 2362/* 2363 * Takes arguments and copies them into a comment 2364 */ 2365static void 2366fill_comment(ipfw_insn *cmd, char **av) 2367{ 2368 int i, l; 2369 char *p = (char *)(cmd + 1); 2370 2371 cmd->opcode = O_NOP; 2372 cmd->len = (cmd->len & (F_NOT | F_OR)); 2373 2374 /* Compute length of comment string. */ 2375 for (i = 0, l = 0; av[i] != NULL; i++) 2376 l += strlen(av[i]) + 1; 2377 if (l == 0) 2378 return; 2379 if (l > 84) 2380 errx(EX_DATAERR, 2381 "comment too long (max 80 chars)"); 2382 l = 1 + (l+3)/4; 2383 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2384 for (i = 0; av[i] != NULL; i++) { 2385 strcpy(p, av[i]); 2386 p += strlen(av[i]); 2387 *p++ = ' '; 2388 } 2389 *(--p) = '\0'; 2390} 2391 2392/* 2393 * A function to fill simple commands of size 1. 2394 * Existing flags are preserved. 2395 */ 2396static void 2397fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2398{ 2399 cmd->opcode = opcode; 2400 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2401 cmd->arg1 = arg; 2402} 2403 2404/* 2405 * Fetch and add the MAC address and type, with masks. This generates one or 2406 * two microinstructions, and returns the pointer to the last one. 2407 */ 2408static ipfw_insn * 2409add_mac(ipfw_insn *cmd, char *av[]) 2410{ 2411 ipfw_insn_mac *mac; 2412 2413 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 2414 errx(EX_DATAERR, "MAC dst src"); 2415 2416 cmd->opcode = O_MACADDR2; 2417 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2418 2419 mac = (ipfw_insn_mac *)cmd; 2420 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2421 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2422 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2423 return cmd; 2424} 2425 2426static ipfw_insn * 2427add_mactype(ipfw_insn *cmd, char *av) 2428{ 2429 if (!av) 2430 errx(EX_DATAERR, "missing MAC type"); 2431 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2432 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2433 cmd->opcode = O_MAC_TYPE; 2434 return cmd; 2435 } else 2436 return NULL; 2437} 2438 2439static ipfw_insn * 2440add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2441{ 2442 struct protoent *pe; 2443 char *ep; 2444 int proto; 2445 2446 proto = strtol(av, &ep, 10); 2447 if (*ep != '\0' || proto <= 0) { 2448 if ((pe = getprotobyname(av)) == NULL) 2449 return NULL; 2450 proto = pe->p_proto; 2451 } 2452 2453 fill_cmd(cmd, O_PROTO, 0, proto); 2454 *protop = proto; 2455 return cmd; 2456} 2457 2458static ipfw_insn * 2459add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2460{ 2461 u_char proto = IPPROTO_IP; 2462 2463 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2464 ; /* do not set O_IP4 nor O_IP6 */ 2465 else if (strcmp(av, "ip4") == 0) 2466 /* explicit "just IPv4" rule */ 2467 fill_cmd(cmd, O_IP4, 0, 0); 2468 else if (strcmp(av, "ip6") == 0) { 2469 /* explicit "just IPv6" rule */ 2470 proto = IPPROTO_IPV6; 2471 fill_cmd(cmd, O_IP6, 0, 0); 2472 } else 2473 return add_proto0(cmd, av, protop); 2474 2475 *protop = proto; 2476 return cmd; 2477} 2478 2479static ipfw_insn * 2480add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2481{ 2482 u_char proto = IPPROTO_IP; 2483 2484 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2485 ; /* do not set O_IP4 nor O_IP6 */ 2486 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2487 /* explicit "just IPv4" rule */ 2488 fill_cmd(cmd, O_IP4, 0, 0); 2489 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2490 /* explicit "just IPv6" rule */ 2491 proto = IPPROTO_IPV6; 2492 fill_cmd(cmd, O_IP6, 0, 0); 2493 } else 2494 return add_proto0(cmd, av, protop); 2495 2496 *protop = proto; 2497 return cmd; 2498} 2499 2500static ipfw_insn * 2501add_srcip(ipfw_insn *cmd, char *av) 2502{ 2503 fill_ip((ipfw_insn_ip *)cmd, av); 2504 if (cmd->opcode == O_IP_DST_SET) /* set */ 2505 cmd->opcode = O_IP_SRC_SET; 2506 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2507 cmd->opcode = O_IP_SRC_LOOKUP; 2508 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2509 cmd->opcode = O_IP_SRC_ME; 2510 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2511 cmd->opcode = O_IP_SRC; 2512 else /* addr/mask */ 2513 cmd->opcode = O_IP_SRC_MASK; 2514 return cmd; 2515} 2516 2517static ipfw_insn * 2518add_dstip(ipfw_insn *cmd, char *av) 2519{ 2520 fill_ip((ipfw_insn_ip *)cmd, av); 2521 if (cmd->opcode == O_IP_DST_SET) /* set */ 2522 ; 2523 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2524 ; 2525 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2526 cmd->opcode = O_IP_DST_ME; 2527 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2528 cmd->opcode = O_IP_DST; 2529 else /* addr/mask */ 2530 cmd->opcode = O_IP_DST_MASK; 2531 return cmd; 2532} 2533 2534static ipfw_insn * 2535add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2536{ 2537 /* XXX "any" is trapped before. Perhaps "to" */ 2538 if (_substrcmp(av, "any") == 0) { 2539 return NULL; 2540 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2541 /* XXX todo: check that we have a protocol with ports */ 2542 cmd->opcode = opcode; 2543 return cmd; 2544 } 2545 return NULL; 2546} 2547 2548static ipfw_insn * 2549add_src(ipfw_insn *cmd, char *av, u_char proto) 2550{ 2551 struct in6_addr a; 2552 char *host, *ch; 2553 ipfw_insn *ret = NULL; 2554 2555 if ((host = strdup(av)) == NULL) 2556 return NULL; 2557 if ((ch = strrchr(host, '/')) != NULL) 2558 *ch = '\0'; 2559 2560 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2561 inet_pton(AF_INET6, host, &a) == 1) 2562 ret = add_srcip6(cmd, av); 2563 /* XXX: should check for IPv4, not !IPv6 */ 2564 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2565 inet_pton(AF_INET6, host, &a) != 1)) 2566 ret = add_srcip(cmd, av); 2567 if (ret == NULL && strcmp(av, "any") != 0) 2568 ret = cmd; 2569 2570 free(host); 2571 return ret; 2572} 2573 2574static ipfw_insn * 2575add_dst(ipfw_insn *cmd, char *av, u_char proto) 2576{ 2577 struct in6_addr a; 2578 char *host, *ch; 2579 ipfw_insn *ret = NULL; 2580 2581 if ((host = strdup(av)) == NULL) 2582 return NULL; 2583 if ((ch = strrchr(host, '/')) != NULL) 2584 *ch = '\0'; 2585 2586 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2587 inet_pton(AF_INET6, host, &a) == 1) 2588 ret = add_dstip6(cmd, av); 2589 /* XXX: should check for IPv4, not !IPv6 */ 2590 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2591 inet_pton(AF_INET6, host, &a) != 1)) 2592 ret = add_dstip(cmd, av); 2593 if (ret == NULL && strcmp(av, "any") != 0) 2594 ret = cmd; 2595 2596 free(host); 2597 return ret; 2598} 2599 2600/* 2601 * Parse arguments and assemble the microinstructions which make up a rule. 2602 * Rules are added into the 'rulebuf' and then copied in the correct order 2603 * into the actual rule. 2604 * 2605 * The syntax for a rule starts with the action, followed by 2606 * optional action parameters, and the various match patterns. 2607 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2608 * (generated if the rule includes a keep-state option), then the 2609 * various match patterns, log/altq actions, and the actual action. 2610 * 2611 */ 2612void 2613ipfw_add(char *av[]) 2614{ 2615 /* 2616 * rules are added into the 'rulebuf' and then copied in 2617 * the correct order into the actual rule. 2618 * Some things that need to go out of order (prob, action etc.) 2619 * go into actbuf[]. 2620 */ 2621 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2622 2623 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2624 ipfw_insn *first_cmd; /* first match pattern */ 2625 2626 struct ip_fw *rule; 2627 2628 /* 2629 * various flags used to record that we entered some fields. 2630 */ 2631 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2632 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2633 size_t len; 2634 2635 int i; 2636 2637 int open_par = 0; /* open parenthesis ( */ 2638 2639 /* proto is here because it is used to fetch ports */ 2640 u_char proto = IPPROTO_IP; /* default protocol */ 2641 2642 double match_prob = 1; /* match probability, default is always match */ 2643 2644 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2645 bzero(cmdbuf, sizeof(cmdbuf)); 2646 bzero(rulebuf, sizeof(rulebuf)); 2647 2648 rule = (struct ip_fw *)rulebuf; 2649 cmd = (ipfw_insn *)cmdbuf; 2650 action = (ipfw_insn *)actbuf; 2651 2652 av++; 2653 2654 /* [rule N] -- Rule number optional */ 2655 if (av[0] && isdigit(**av)) { 2656 rule->rulenum = atoi(*av); 2657 av++; 2658 } 2659 2660 /* [set N] -- set number (0..RESVD_SET), optional */ 2661 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 2662 int set = strtoul(av[1], NULL, 10); 2663 if (set < 0 || set > RESVD_SET) 2664 errx(EX_DATAERR, "illegal set %s", av[1]); 2665 rule->set = set; 2666 av += 2; 2667 } 2668 2669 /* [prob D] -- match probability, optional */ 2670 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 2671 match_prob = strtod(av[1], NULL); 2672 2673 if (match_prob <= 0 || match_prob > 1) 2674 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2675 av += 2; 2676 } 2677 2678 /* action -- mandatory */ 2679 NEED1("missing action"); 2680 i = match_token(rule_actions, *av); 2681 av++; 2682 action->len = 1; /* default */ 2683 switch(i) { 2684 case TOK_CHECKSTATE: 2685 have_state = action; 2686 action->opcode = O_CHECK_STATE; 2687 break; 2688 2689 case TOK_ACCEPT: 2690 action->opcode = O_ACCEPT; 2691 break; 2692 2693 case TOK_DENY: 2694 action->opcode = O_DENY; 2695 action->arg1 = 0; 2696 break; 2697 2698 case TOK_REJECT: 2699 action->opcode = O_REJECT; 2700 action->arg1 = ICMP_UNREACH_HOST; 2701 break; 2702 2703 case TOK_RESET: 2704 action->opcode = O_REJECT; 2705 action->arg1 = ICMP_REJECT_RST; 2706 break; 2707 2708 case TOK_RESET6: 2709 action->opcode = O_UNREACH6; 2710 action->arg1 = ICMP6_UNREACH_RST; 2711 break; 2712 2713 case TOK_UNREACH: 2714 action->opcode = O_REJECT; 2715 NEED1("missing reject code"); 2716 fill_reject_code(&action->arg1, *av); 2717 av++; 2718 break; 2719 2720 case TOK_UNREACH6: 2721 action->opcode = O_UNREACH6; 2722 NEED1("missing unreach code"); 2723 fill_unreach6_code(&action->arg1, *av); 2724 av++; 2725 break; 2726 2727 case TOK_COUNT: 2728 action->opcode = O_COUNT; 2729 break; 2730 2731 case TOK_NAT: 2732 action->opcode = O_NAT; 2733 action->len = F_INSN_SIZE(ipfw_insn_nat); 2734 goto chkarg; 2735 2736 case TOK_QUEUE: 2737 action->opcode = O_QUEUE; 2738 goto chkarg; 2739 case TOK_PIPE: 2740 action->opcode = O_PIPE; 2741 goto chkarg; 2742 case TOK_SKIPTO: 2743 action->opcode = O_SKIPTO; 2744 goto chkarg; 2745 case TOK_NETGRAPH: 2746 action->opcode = O_NETGRAPH; 2747 goto chkarg; 2748 case TOK_NGTEE: 2749 action->opcode = O_NGTEE; 2750 goto chkarg; 2751 case TOK_DIVERT: 2752 action->opcode = O_DIVERT; 2753 goto chkarg; 2754 case TOK_TEE: 2755 action->opcode = O_TEE; 2756chkarg: 2757 if (!av[0]) 2758 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2759 if (isdigit(**av)) { 2760 action->arg1 = strtoul(*av, NULL, 10); 2761 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2762 errx(EX_DATAERR, "illegal argument for %s", 2763 *(av - 1)); 2764 } else if (_substrcmp(*av, "tablearg") == 0) { 2765 action->arg1 = IP_FW_TABLEARG; 2766 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2767 struct servent *s; 2768 setservent(1); 2769 s = getservbyname(av[0], "divert"); 2770 if (s != NULL) 2771 action->arg1 = ntohs(s->s_port); 2772 else 2773 errx(EX_DATAERR, "illegal divert/tee port"); 2774 } else 2775 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2776 av++; 2777 break; 2778 2779 case TOK_FORWARD: { 2780 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2781 char *s, *end; 2782 2783 NEED1("missing forward address[:port]"); 2784 2785 action->opcode = O_FORWARD_IP; 2786 action->len = F_INSN_SIZE(ipfw_insn_sa); 2787 2788 /* 2789 * In the kernel we assume AF_INET and use only 2790 * sin_port and sin_addr. Remember to set sin_len as 2791 * the routing code seems to use it too. 2792 */ 2793 p->sa.sin_family = AF_INET; 2794 p->sa.sin_len = sizeof(struct sockaddr_in); 2795 p->sa.sin_port = 0; 2796 /* 2797 * locate the address-port separator (':' or ',') 2798 */ 2799 s = strchr(*av, ':'); 2800 if (s == NULL) 2801 s = strchr(*av, ','); 2802 if (s != NULL) { 2803 *(s++) = '\0'; 2804 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2805 if (s == end) 2806 errx(EX_DATAERR, 2807 "illegal forwarding port ``%s''", s); 2808 p->sa.sin_port = (u_short)i; 2809 } 2810 if (_substrcmp(*av, "tablearg") == 0) 2811 p->sa.sin_addr.s_addr = INADDR_ANY; 2812 else 2813 lookup_host(*av, &(p->sa.sin_addr)); 2814 av++; 2815 break; 2816 } 2817 case TOK_COMMENT: 2818 /* pretend it is a 'count' rule followed by the comment */ 2819 action->opcode = O_COUNT; 2820 av--; /* go back... */ 2821 break; 2822 2823 case TOK_SETFIB: 2824 { 2825 int numfibs; 2826 size_t intsize = sizeof(int); 2827 2828 action->opcode = O_SETFIB; 2829 NEED1("missing fib number"); 2830 action->arg1 = strtoul(*av, NULL, 10); 2831 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2832 errx(EX_DATAERR, "fibs not suported.\n"); 2833 if (action->arg1 >= numfibs) /* Temporary */ 2834 errx(EX_DATAERR, "fib too large.\n"); 2835 av++; 2836 break; 2837 } 2838 2839 case TOK_REASS: 2840 action->opcode = O_REASS; 2841 break; 2842 2843 default: 2844 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2845 } 2846 action = next_cmd(action); 2847 2848 /* 2849 * [altq queuename] -- altq tag, optional 2850 * [log [logamount N]] -- log, optional 2851 * 2852 * If they exist, it go first in the cmdbuf, but then it is 2853 * skipped in the copy section to the end of the buffer. 2854 */ 2855 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 2856 av++; 2857 switch (i) { 2858 case TOK_LOG: 2859 { 2860 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2861 int l; 2862 2863 if (have_log) 2864 errx(EX_DATAERR, 2865 "log cannot be specified more than once"); 2866 have_log = (ipfw_insn *)c; 2867 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2868 cmd->opcode = O_LOG; 2869 if (av[0] && _substrcmp(*av, "logamount") == 0) { 2870 av++; 2871 NEED1("logamount requires argument"); 2872 l = atoi(*av); 2873 if (l < 0) 2874 errx(EX_DATAERR, 2875 "logamount must be positive"); 2876 c->max_log = l; 2877 av++; 2878 } else { 2879 len = sizeof(c->max_log); 2880 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2881 &c->max_log, &len, NULL, 0) == -1) 2882 errx(1, "sysctlbyname(\"%s\")", 2883 "net.inet.ip.fw.verbose_limit"); 2884 } 2885 } 2886 break; 2887 2888#ifndef NO_ALTQ 2889 case TOK_ALTQ: 2890 { 2891 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2892 2893 NEED1("missing altq queue name"); 2894 if (have_altq) 2895 errx(EX_DATAERR, 2896 "altq cannot be specified more than once"); 2897 have_altq = (ipfw_insn *)a; 2898 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2899 cmd->opcode = O_ALTQ; 2900 a->qid = altq_name_to_qid(*av); 2901 av++; 2902 } 2903 break; 2904#endif 2905 2906 case TOK_TAG: 2907 case TOK_UNTAG: { 2908 uint16_t tag; 2909 2910 if (have_tag) 2911 errx(EX_USAGE, "tag and untag cannot be " 2912 "specified more than once"); 2913 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 2914 rule_action_params); 2915 have_tag = cmd; 2916 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2917 av++; 2918 break; 2919 } 2920 2921 default: 2922 abort(); 2923 } 2924 cmd = next_cmd(cmd); 2925 } 2926 2927 if (have_state) /* must be a check-state, we are done */ 2928 goto done; 2929 2930#define OR_START(target) \ 2931 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 2932 if (open_par) \ 2933 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2934 prev = NULL; \ 2935 open_par = 1; \ 2936 if ( (av[0])[1] == '\0') { \ 2937 av++; \ 2938 } else \ 2939 (*av)++; \ 2940 } \ 2941 target: \ 2942 2943 2944#define CLOSE_PAR \ 2945 if (open_par) { \ 2946 if (av[0] && ( \ 2947 strcmp(*av, ")") == 0 || \ 2948 strcmp(*av, "}") == 0)) { \ 2949 prev = NULL; \ 2950 open_par = 0; \ 2951 av++; \ 2952 } else \ 2953 errx(EX_USAGE, "missing \")\"\n"); \ 2954 } 2955 2956#define NOT_BLOCK \ 2957 if (av[0] && _substrcmp(*av, "not") == 0) { \ 2958 if (cmd->len & F_NOT) \ 2959 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2960 cmd->len |= F_NOT; \ 2961 av++; \ 2962 } 2963 2964#define OR_BLOCK(target) \ 2965 if (av[0] && _substrcmp(*av, "or") == 0) { \ 2966 if (prev == NULL || open_par == 0) \ 2967 errx(EX_DATAERR, "invalid OR block"); \ 2968 prev->len |= F_OR; \ 2969 av++; \ 2970 goto target; \ 2971 } \ 2972 CLOSE_PAR; 2973 2974 first_cmd = cmd; 2975 2976#if 0 2977 /* 2978 * MAC addresses, optional. 2979 * If we have this, we skip the part "proto from src to dst" 2980 * and jump straight to the option parsing. 2981 */ 2982 NOT_BLOCK; 2983 NEED1("missing protocol"); 2984 if (_substrcmp(*av, "MAC") == 0 || 2985 _substrcmp(*av, "mac") == 0) { 2986 av++; /* the "MAC" keyword */ 2987 add_mac(cmd, av); /* exits in case of errors */ 2988 cmd = next_cmd(cmd); 2989 av += 2; /* dst-mac and src-mac */ 2990 NOT_BLOCK; 2991 NEED1("missing mac type"); 2992 if (add_mactype(cmd, av[0])) 2993 cmd = next_cmd(cmd); 2994 av++; /* any or mac-type */ 2995 goto read_options; 2996 } 2997#endif 2998 2999 /* 3000 * protocol, mandatory 3001 */ 3002 OR_START(get_proto); 3003 NOT_BLOCK; 3004 NEED1("missing protocol"); 3005 if (add_proto_compat(cmd, *av, &proto)) { 3006 av++; 3007 if (F_LEN(cmd) != 0) { 3008 prev = cmd; 3009 cmd = next_cmd(cmd); 3010 } 3011 } else if (first_cmd != cmd) { 3012 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3013 } else 3014 goto read_options; 3015 OR_BLOCK(get_proto); 3016 3017 /* 3018 * "from", mandatory 3019 */ 3020 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3021 errx(EX_USAGE, "missing ``from''"); 3022 av++; 3023 3024 /* 3025 * source IP, mandatory 3026 */ 3027 OR_START(source_ip); 3028 NOT_BLOCK; /* optional "not" */ 3029 NEED1("missing source address"); 3030 if (add_src(cmd, *av, proto)) { 3031 av++; 3032 if (F_LEN(cmd) != 0) { /* ! any */ 3033 prev = cmd; 3034 cmd = next_cmd(cmd); 3035 } 3036 } else 3037 errx(EX_USAGE, "bad source address %s", *av); 3038 OR_BLOCK(source_ip); 3039 3040 /* 3041 * source ports, optional 3042 */ 3043 NOT_BLOCK; /* optional "not" */ 3044 if ( av[0] != NULL ) { 3045 if (_substrcmp(*av, "any") == 0 || 3046 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3047 av++; 3048 if (F_LEN(cmd) != 0) 3049 cmd = next_cmd(cmd); 3050 } 3051 } 3052 3053 /* 3054 * "to", mandatory 3055 */ 3056 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 3057 errx(EX_USAGE, "missing ``to''"); 3058 av++; 3059 3060 /* 3061 * destination, mandatory 3062 */ 3063 OR_START(dest_ip); 3064 NOT_BLOCK; /* optional "not" */ 3065 NEED1("missing dst address"); 3066 if (add_dst(cmd, *av, proto)) { 3067 av++; 3068 if (F_LEN(cmd) != 0) { /* ! any */ 3069 prev = cmd; 3070 cmd = next_cmd(cmd); 3071 } 3072 } else 3073 errx( EX_USAGE, "bad destination address %s", *av); 3074 OR_BLOCK(dest_ip); 3075 3076 /* 3077 * dest. ports, optional 3078 */ 3079 NOT_BLOCK; /* optional "not" */ 3080 if (av[0]) { 3081 if (_substrcmp(*av, "any") == 0 || 3082 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3083 av++; 3084 if (F_LEN(cmd) != 0) 3085 cmd = next_cmd(cmd); 3086 } 3087 } 3088 3089read_options: 3090 if (av[0] && first_cmd == cmd) { 3091 /* 3092 * nothing specified so far, store in the rule to ease 3093 * printout later. 3094 */ 3095 rule->_pad = 1; 3096 } 3097 prev = NULL; 3098 while ( av[0] != NULL ) { 3099 char *s; 3100 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3101 3102 s = *av; 3103 cmd32 = (ipfw_insn_u32 *)cmd; 3104 3105 if (*s == '!') { /* alternate syntax for NOT */ 3106 if (cmd->len & F_NOT) 3107 errx(EX_USAGE, "double \"not\" not allowed\n"); 3108 cmd->len = F_NOT; 3109 s++; 3110 } 3111 i = match_token(rule_options, s); 3112 av++; 3113 switch(i) { 3114 case TOK_NOT: 3115 if (cmd->len & F_NOT) 3116 errx(EX_USAGE, "double \"not\" not allowed\n"); 3117 cmd->len = F_NOT; 3118 break; 3119 3120 case TOK_OR: 3121 if (open_par == 0 || prev == NULL) 3122 errx(EX_USAGE, "invalid \"or\" block\n"); 3123 prev->len |= F_OR; 3124 break; 3125 3126 case TOK_STARTBRACE: 3127 if (open_par) 3128 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3129 open_par = 1; 3130 break; 3131 3132 case TOK_ENDBRACE: 3133 if (!open_par) 3134 errx(EX_USAGE, "+missing \")\"\n"); 3135 open_par = 0; 3136 prev = NULL; 3137 break; 3138 3139 case TOK_IN: 3140 fill_cmd(cmd, O_IN, 0, 0); 3141 break; 3142 3143 case TOK_OUT: 3144 cmd->len ^= F_NOT; /* toggle F_NOT */ 3145 fill_cmd(cmd, O_IN, 0, 0); 3146 break; 3147 3148 case TOK_DIVERTED: 3149 fill_cmd(cmd, O_DIVERTED, 0, 3); 3150 break; 3151 3152 case TOK_DIVERTEDLOOPBACK: 3153 fill_cmd(cmd, O_DIVERTED, 0, 1); 3154 break; 3155 3156 case TOK_DIVERTEDOUTPUT: 3157 fill_cmd(cmd, O_DIVERTED, 0, 2); 3158 break; 3159 3160 case TOK_FRAG: 3161 fill_cmd(cmd, O_FRAG, 0, 0); 3162 break; 3163 3164 case TOK_LAYER2: 3165 fill_cmd(cmd, O_LAYER2, 0, 0); 3166 break; 3167 3168 case TOK_XMIT: 3169 case TOK_RECV: 3170 case TOK_VIA: 3171 NEED1("recv, xmit, via require interface name" 3172 " or address"); 3173 fill_iface((ipfw_insn_if *)cmd, av[0]); 3174 av++; 3175 if (F_LEN(cmd) == 0) /* not a valid address */ 3176 break; 3177 if (i == TOK_XMIT) 3178 cmd->opcode = O_XMIT; 3179 else if (i == TOK_RECV) 3180 cmd->opcode = O_RECV; 3181 else if (i == TOK_VIA) 3182 cmd->opcode = O_VIA; 3183 break; 3184 3185 case TOK_ICMPTYPES: 3186 NEED1("icmptypes requires list of types"); 3187 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3188 av++; 3189 break; 3190 3191 case TOK_ICMP6TYPES: 3192 NEED1("icmptypes requires list of types"); 3193 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3194 av++; 3195 break; 3196 3197 case TOK_IPTTL: 3198 NEED1("ipttl requires TTL"); 3199 if (strpbrk(*av, "-,")) { 3200 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3201 errx(EX_DATAERR, "invalid ipttl %s", *av); 3202 } else 3203 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3204 av++; 3205 break; 3206 3207 case TOK_IPID: 3208 NEED1("ipid requires id"); 3209 if (strpbrk(*av, "-,")) { 3210 if (!add_ports(cmd, *av, 0, O_IPID)) 3211 errx(EX_DATAERR, "invalid ipid %s", *av); 3212 } else 3213 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3214 av++; 3215 break; 3216 3217 case TOK_IPLEN: 3218 NEED1("iplen requires length"); 3219 if (strpbrk(*av, "-,")) { 3220 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3221 errx(EX_DATAERR, "invalid ip len %s", *av); 3222 } else 3223 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3224 av++; 3225 break; 3226 3227 case TOK_IPVER: 3228 NEED1("ipver requires version"); 3229 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3230 av++; 3231 break; 3232 3233 case TOK_IPPRECEDENCE: 3234 NEED1("ipprecedence requires value"); 3235 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3236 (strtoul(*av, NULL, 0) & 7) << 5); 3237 av++; 3238 break; 3239 3240 case TOK_IPOPTS: 3241 NEED1("missing argument for ipoptions"); 3242 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3243 av++; 3244 break; 3245 3246 case TOK_IPTOS: 3247 NEED1("missing argument for iptos"); 3248 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3249 av++; 3250 break; 3251 3252 case TOK_UID: 3253 NEED1("uid requires argument"); 3254 { 3255 char *end; 3256 uid_t uid; 3257 struct passwd *pwd; 3258 3259 cmd->opcode = O_UID; 3260 uid = strtoul(*av, &end, 0); 3261 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3262 if (pwd == NULL) 3263 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3264 cmd32->d[0] = pwd->pw_uid; 3265 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3266 av++; 3267 } 3268 break; 3269 3270 case TOK_GID: 3271 NEED1("gid requires argument"); 3272 { 3273 char *end; 3274 gid_t gid; 3275 struct group *grp; 3276 3277 cmd->opcode = O_GID; 3278 gid = strtoul(*av, &end, 0); 3279 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3280 if (grp == NULL) 3281 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3282 cmd32->d[0] = grp->gr_gid; 3283 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3284 av++; 3285 } 3286 break; 3287 3288 case TOK_JAIL: 3289 NEED1("jail requires argument"); 3290 { 3291 char *end; 3292 int jid; 3293 3294 cmd->opcode = O_JAIL; 3295 jid = (int)strtol(*av, &end, 0); 3296 if (jid < 0 || *end != '\0') 3297 errx(EX_DATAERR, "jail requires prison ID"); 3298 cmd32->d[0] = (uint32_t)jid; 3299 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3300 av++; 3301 } 3302 break; 3303 3304 case TOK_ESTAB: 3305 fill_cmd(cmd, O_ESTAB, 0, 0); 3306 break; 3307 3308 case TOK_SETUP: 3309 fill_cmd(cmd, O_TCPFLAGS, 0, 3310 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3311 break; 3312 3313 case TOK_TCPDATALEN: 3314 NEED1("tcpdatalen requires length"); 3315 if (strpbrk(*av, "-,")) { 3316 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3317 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3318 } else 3319 fill_cmd(cmd, O_TCPDATALEN, 0, 3320 strtoul(*av, NULL, 0)); 3321 av++; 3322 break; 3323 3324 case TOK_TCPOPTS: 3325 NEED1("missing argument for tcpoptions"); 3326 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3327 av++; 3328 break; 3329 3330 case TOK_TCPSEQ: 3331 case TOK_TCPACK: 3332 NEED1("tcpseq/tcpack requires argument"); 3333 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3334 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3335 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3336 av++; 3337 break; 3338 3339 case TOK_TCPWIN: 3340 NEED1("tcpwin requires length"); 3341 fill_cmd(cmd, O_TCPWIN, 0, 3342 htons(strtoul(*av, NULL, 0))); 3343 av++; 3344 break; 3345 3346 case TOK_TCPFLAGS: 3347 NEED1("missing argument for tcpflags"); 3348 cmd->opcode = O_TCPFLAGS; 3349 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3350 av++; 3351 break; 3352 3353 case TOK_KEEPSTATE: 3354 if (open_par) 3355 errx(EX_USAGE, "keep-state cannot be part " 3356 "of an or block"); 3357 if (have_state) 3358 errx(EX_USAGE, "only one of keep-state " 3359 "and limit is allowed"); 3360 have_state = cmd; 3361 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3362 break; 3363 3364 case TOK_LIMIT: { 3365 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3366 int val; 3367 3368 if (open_par) 3369 errx(EX_USAGE, 3370 "limit cannot be part of an or block"); 3371 if (have_state) 3372 errx(EX_USAGE, "only one of keep-state and " 3373 "limit is allowed"); 3374 have_state = cmd; 3375 3376 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3377 cmd->opcode = O_LIMIT; 3378 c->limit_mask = c->conn_limit = 0; 3379 3380 while ( av[0] != NULL ) { 3381 if ((val = match_token(limit_masks, *av)) <= 0) 3382 break; 3383 c->limit_mask |= val; 3384 av++; 3385 } 3386 3387 if (c->limit_mask == 0) 3388 errx(EX_USAGE, "limit: missing limit mask"); 3389 3390 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3391 TOK_LIMIT, rule_options); 3392 3393 av++; 3394 break; 3395 } 3396 3397 case TOK_PROTO: 3398 NEED1("missing protocol"); 3399 if (add_proto(cmd, *av, &proto)) { 3400 av++; 3401 } else 3402 errx(EX_DATAERR, "invalid protocol ``%s''", 3403 *av); 3404 break; 3405 3406 case TOK_SRCIP: 3407 NEED1("missing source IP"); 3408 if (add_srcip(cmd, *av)) { 3409 av++; 3410 } 3411 break; 3412 3413 case TOK_DSTIP: 3414 NEED1("missing destination IP"); 3415 if (add_dstip(cmd, *av)) { 3416 av++; 3417 } 3418 break; 3419 3420 case TOK_SRCIP6: 3421 NEED1("missing source IP6"); 3422 if (add_srcip6(cmd, *av)) { 3423 av++; 3424 } 3425 break; 3426 3427 case TOK_DSTIP6: 3428 NEED1("missing destination IP6"); 3429 if (add_dstip6(cmd, *av)) { 3430 av++; 3431 } 3432 break; 3433 3434 case TOK_SRCPORT: 3435 NEED1("missing source port"); 3436 if (_substrcmp(*av, "any") == 0 || 3437 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3438 av++; 3439 } else 3440 errx(EX_DATAERR, "invalid source port %s", *av); 3441 break; 3442 3443 case TOK_DSTPORT: 3444 NEED1("missing destination port"); 3445 if (_substrcmp(*av, "any") == 0 || 3446 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3447 av++; 3448 } else 3449 errx(EX_DATAERR, "invalid destination port %s", 3450 *av); 3451 break; 3452 3453 case TOK_MAC: 3454 if (add_mac(cmd, av)) 3455 av += 2; 3456 break; 3457 3458 case TOK_MACTYPE: 3459 NEED1("missing mac type"); 3460 if (!add_mactype(cmd, *av)) 3461 errx(EX_DATAERR, "invalid mac type %s", *av); 3462 av++; 3463 break; 3464 3465 case TOK_VERREVPATH: 3466 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3467 break; 3468 3469 case TOK_VERSRCREACH: 3470 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3471 break; 3472 3473 case TOK_ANTISPOOF: 3474 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3475 break; 3476 3477 case TOK_IPSEC: 3478 fill_cmd(cmd, O_IPSEC, 0, 0); 3479 break; 3480 3481 case TOK_IPV6: 3482 fill_cmd(cmd, O_IP6, 0, 0); 3483 break; 3484 3485 case TOK_IPV4: 3486 fill_cmd(cmd, O_IP4, 0, 0); 3487 break; 3488 3489 case TOK_EXT6HDR: 3490 fill_ext6hdr( cmd, *av ); 3491 av++; 3492 break; 3493 3494 case TOK_FLOWID: 3495 if (proto != IPPROTO_IPV6 ) 3496 errx( EX_USAGE, "flow-id filter is active " 3497 "only for ipv6 protocol\n"); 3498 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3499 av++; 3500 break; 3501 3502 case TOK_COMMENT: 3503 fill_comment(cmd, av); 3504 av[0]=NULL; 3505 break; 3506 3507 case TOK_TAGGED: 3508 if (av[0] && strpbrk(*av, "-,")) { 3509 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3510 errx(EX_DATAERR, "tagged: invalid tag" 3511 " list: %s", *av); 3512 } 3513 else { 3514 uint16_t tag; 3515 3516 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3517 TOK_TAGGED, rule_options); 3518 fill_cmd(cmd, O_TAGGED, 0, tag); 3519 } 3520 av++; 3521 break; 3522 3523 case TOK_FIB: 3524 NEED1("fib requires fib number"); 3525 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3526 av++; 3527 break; 3528 3529 case TOK_LOOKUP: { 3530 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 3531 char *p; 3532 int j; 3533 3534 if (!av[0] || !av[1]) 3535 errx(EX_USAGE, "format: lookup argument tablenum"); 3536 cmd->opcode = O_IP_DST_LOOKUP; 3537 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 3538 i = match_token(rule_options, *av); 3539 for (j = 0; lookup_key[j] >= 0 ; j++) { 3540 if (i == lookup_key[j]) 3541 break; 3542 } 3543 if (lookup_key[j] <= 0) 3544 errx(EX_USAGE, "format: cannot lookup on %s", *av); 3545 c->d[1] = j; // i converted to option 3546 av++; 3547 cmd->arg1 = strtoul(*av, &p, 0); 3548 if (p && *p) 3549 errx(EX_USAGE, "format: lookup argument tablenum"); 3550 av++; 3551 } 3552 break; 3553 3554 default: 3555 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3556 } 3557 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3558 prev = cmd; 3559 cmd = next_cmd(cmd); 3560 } 3561 } 3562 3563done: 3564 /* 3565 * Now copy stuff into the rule. 3566 * If we have a keep-state option, the first instruction 3567 * must be a PROBE_STATE (which is generated here). 3568 * If we have a LOG option, it was stored as the first command, 3569 * and now must be moved to the top of the action part. 3570 */ 3571 dst = (ipfw_insn *)rule->cmd; 3572 3573 /* 3574 * First thing to write into the command stream is the match probability. 3575 */ 3576 if (match_prob != 1) { /* 1 means always match */ 3577 dst->opcode = O_PROB; 3578 dst->len = 2; 3579 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3580 dst += dst->len; 3581 } 3582 3583 /* 3584 * generate O_PROBE_STATE if necessary 3585 */ 3586 if (have_state && have_state->opcode != O_CHECK_STATE) { 3587 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3588 dst = next_cmd(dst); 3589 } 3590 3591 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3592 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3593 i = F_LEN(src); 3594 3595 switch (src->opcode) { 3596 case O_LOG: 3597 case O_KEEP_STATE: 3598 case O_LIMIT: 3599 case O_ALTQ: 3600 case O_TAG: 3601 break; 3602 default: 3603 bcopy(src, dst, i * sizeof(uint32_t)); 3604 dst += i; 3605 } 3606 } 3607 3608 /* 3609 * put back the have_state command as last opcode 3610 */ 3611 if (have_state && have_state->opcode != O_CHECK_STATE) { 3612 i = F_LEN(have_state); 3613 bcopy(have_state, dst, i * sizeof(uint32_t)); 3614 dst += i; 3615 } 3616 /* 3617 * start action section 3618 */ 3619 rule->act_ofs = dst - rule->cmd; 3620 3621 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3622 if (have_log) { 3623 i = F_LEN(have_log); 3624 bcopy(have_log, dst, i * sizeof(uint32_t)); 3625 dst += i; 3626 } 3627 if (have_altq) { 3628 i = F_LEN(have_altq); 3629 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3630 dst += i; 3631 } 3632 if (have_tag) { 3633 i = F_LEN(have_tag); 3634 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3635 dst += i; 3636 } 3637 /* 3638 * copy all other actions 3639 */ 3640 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3641 i = F_LEN(src); 3642 bcopy(src, dst, i * sizeof(uint32_t)); 3643 dst += i; 3644 } 3645 3646 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3647 i = (char *)dst - (char *)rule; 3648 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3649 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3650 if (!co.do_quiet) 3651 show_ipfw(rule, 0, 0); 3652} 3653 3654/* 3655 * clear the counters or the log counters. 3656 */ 3657void 3658ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3659{ 3660 uint32_t arg, saved_arg; 3661 int failed = EX_OK; 3662 char const *errstr; 3663 char const *name = optname ? "RESETLOG" : "ZERO"; 3664 3665 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3666 3667 av++; ac--; 3668 3669 if (!ac) { 3670 /* clear all entries */ 3671 if (do_cmd(optname, NULL, 0) < 0) 3672 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3673 if (!co.do_quiet) 3674 printf("%s.\n", optname == IP_FW_ZERO ? 3675 "Accounting cleared":"Logging counts reset"); 3676 3677 return; 3678 } 3679 3680 while (ac) { 3681 /* Rule number */ 3682 if (isdigit(**av)) { 3683 arg = strtonum(*av, 0, 0xffff, &errstr); 3684 if (errstr) 3685 errx(EX_DATAERR, 3686 "invalid rule number %s\n", *av); 3687 saved_arg = arg; 3688 if (co.use_set) 3689 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3690 av++; 3691 ac--; 3692 if (do_cmd(optname, &arg, sizeof(arg))) { 3693 warn("rule %u: setsockopt(IP_FW_%s)", 3694 saved_arg, name); 3695 failed = EX_UNAVAILABLE; 3696 } else if (!co.do_quiet) 3697 printf("Entry %d %s.\n", saved_arg, 3698 optname == IP_FW_ZERO ? 3699 "cleared" : "logging count reset"); 3700 } else { 3701 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3702 } 3703 } 3704 if (failed != EX_OK) 3705 exit(failed); 3706} 3707 3708void 3709ipfw_flush(int force) 3710{ 3711 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3712 3713 if (!force && !co.do_quiet) { /* need to ask user */ 3714 int c; 3715 3716 printf("Are you sure? [yn] "); 3717 fflush(stdout); 3718 do { 3719 c = toupper(getc(stdin)); 3720 while (c != '\n' && getc(stdin) != '\n') 3721 if (feof(stdin)) 3722 return; /* and do not flush */ 3723 } while (c != 'Y' && c != 'N'); 3724 printf("\n"); 3725 if (c == 'N') /* user said no */ 3726 return; 3727 } 3728 if (co.do_pipe) { 3729 dummynet_flush(); 3730 return; 3731 } 3732 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3733 if (co.use_set) { 3734 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3735 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3736 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3737 } else if (do_cmd(cmd, NULL, 0) < 0) 3738 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3739 co.do_pipe ? "DUMMYNET" : "FW"); 3740 if (!co.do_quiet) 3741 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3742} 3743 3744 3745static void table_list(ipfw_table_entry ent, int need_header); 3746 3747/* 3748 * This one handles all table-related commands 3749 * ipfw table N add addr[/masklen] [value] 3750 * ipfw table N delete addr[/masklen] 3751 * ipfw table {N | all} flush 3752 * ipfw table {N | all} list 3753 */ 3754void 3755ipfw_table_handler(int ac, char *av[]) 3756{ 3757 ipfw_table_entry ent; 3758 int do_add; 3759 int is_all; 3760 size_t len; 3761 char *p; 3762 uint32_t a; 3763 uint32_t tables_max; 3764 3765 len = sizeof(tables_max); 3766 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3767 NULL, 0) == -1) { 3768#ifdef IPFW_TABLES_MAX 3769 warn("Warn: Failed to get the max tables number via sysctl. " 3770 "Using the compiled in defaults. \nThe reason was"); 3771 tables_max = IPFW_TABLES_MAX; 3772#else 3773 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3774#endif 3775 } 3776 3777 ac--; av++; 3778 if (ac && isdigit(**av)) { 3779 ent.tbl = atoi(*av); 3780 is_all = 0; 3781 ac--; av++; 3782 } else if (ac && _substrcmp(*av, "all") == 0) { 3783 ent.tbl = 0; 3784 is_all = 1; 3785 ac--; av++; 3786 } else 3787 errx(EX_USAGE, "table number or 'all' keyword required"); 3788 if (ent.tbl >= tables_max) 3789 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3790 "value (%d)", tables_max - 1); 3791 NEED1("table needs command"); 3792 if (is_all && _substrcmp(*av, "list") != 0 3793 && _substrcmp(*av, "flush") != 0) 3794 errx(EX_USAGE, "table number required"); 3795 3796 if (_substrcmp(*av, "add") == 0 || 3797 _substrcmp(*av, "delete") == 0) { 3798 do_add = **av == 'a'; 3799 ac--; av++; 3800 if (!ac) 3801 errx(EX_USAGE, "IP address required"); 3802 p = strchr(*av, '/'); 3803 if (p) { 3804 *p++ = '\0'; 3805 ent.masklen = atoi(p); 3806 if (ent.masklen > 32) 3807 errx(EX_DATAERR, "bad width ``%s''", p); 3808 } else 3809 ent.masklen = 32; 3810 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3811 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3812 ac--; av++; 3813 if (do_add && ac) { 3814 unsigned int tval; 3815 /* isdigit is a bit of a hack here.. */ 3816 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3817 ent.value = strtoul(*av, NULL, 0); 3818 } else { 3819 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3820 /* The value must be stored in host order * 3821 * so that the values < 65k can be distinguished */ 3822 ent.value = ntohl(tval); 3823 } else { 3824 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3825 } 3826 } 3827 } else 3828 ent.value = 0; 3829 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3830 &ent, sizeof(ent)) < 0) { 3831 /* If running silent, don't bomb out on these errors. */ 3832 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3833 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3834 do_add ? "ADD" : "DEL"); 3835 /* In silent mode, react to a failed add by deleting */ 3836 if (do_add) { 3837 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3838 if (do_cmd(IP_FW_TABLE_ADD, 3839 &ent, sizeof(ent)) < 0) 3840 err(EX_OSERR, 3841 "setsockopt(IP_FW_TABLE_ADD)"); 3842 } 3843 } 3844 } else if (_substrcmp(*av, "flush") == 0) { 3845 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3846 do { 3847 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3848 sizeof(ent.tbl)) < 0) 3849 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3850 } while (++ent.tbl < a); 3851 } else if (_substrcmp(*av, "list") == 0) { 3852 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3853 do { 3854 table_list(ent, is_all); 3855 } while (++ent.tbl < a); 3856 } else 3857 errx(EX_USAGE, "invalid table command %s", *av); 3858} 3859 3860static void 3861table_list(ipfw_table_entry ent, int need_header) 3862{ 3863 ipfw_table *tbl; 3864 socklen_t l; 3865 uint32_t a; 3866 3867 a = ent.tbl; 3868 l = sizeof(a); 3869 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3870 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3871 3872 /* If a is zero we have nothing to do, the table is empty. */ 3873 if (a == 0) 3874 return; 3875 3876 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3877 tbl = safe_calloc(1, l); 3878 tbl->tbl = ent.tbl; 3879 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3880 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3881 if (tbl->cnt && need_header) 3882 printf("---table(%d)---\n", tbl->tbl); 3883 for (a = 0; a < tbl->cnt; a++) { 3884 unsigned int tval; 3885 tval = tbl->ent[a].value; 3886 if (co.do_value_as_ip) { 3887 char tbuf[128]; 3888 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3889 &tbl->ent[a].addr), 127); 3890 /* inet_ntoa expects network order */ 3891 tval = htonl(tval); 3892 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3893 inet_ntoa(*(struct in_addr *)&tval)); 3894 } else { 3895 printf("%s/%u %u\n", 3896 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3897 tbl->ent[a].masklen, tval); 3898 } 3899 } 3900 free(tbl); 3901} 3902