ipfw2.c revision 215179
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 215179 2010-11-12 13:05:17Z luigi $ 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 { "sockarg", TOK_SOCKARG }, 270 { "tcpdatalen", TOK_TCPDATALEN }, 271 { "tcpflags", TOK_TCPFLAGS }, 272 { "tcpflgs", TOK_TCPFLAGS }, 273 { "tcpoptions", TOK_TCPOPTS }, 274 { "tcpopts", TOK_TCPOPTS }, 275 { "tcpseq", TOK_TCPSEQ }, 276 { "tcpack", TOK_TCPACK }, 277 { "tcpwin", TOK_TCPWIN }, 278 { "icmptype", TOK_ICMPTYPES }, 279 { "icmptypes", TOK_ICMPTYPES }, 280 { "dst-ip", TOK_DSTIP }, 281 { "src-ip", TOK_SRCIP }, 282 { "dst-port", TOK_DSTPORT }, 283 { "src-port", TOK_SRCPORT }, 284 { "proto", TOK_PROTO }, 285 { "MAC", TOK_MAC }, 286 { "mac", TOK_MAC }, 287 { "mac-type", TOK_MACTYPE }, 288 { "verrevpath", TOK_VERREVPATH }, 289 { "versrcreach", TOK_VERSRCREACH }, 290 { "antispoof", TOK_ANTISPOOF }, 291 { "ipsec", TOK_IPSEC }, 292 { "icmp6type", TOK_ICMP6TYPES }, 293 { "icmp6types", TOK_ICMP6TYPES }, 294 { "ext6hdr", TOK_EXT6HDR}, 295 { "flow-id", TOK_FLOWID}, 296 { "ipv6", TOK_IPV6}, 297 { "ip6", TOK_IPV6}, 298 { "ipv4", TOK_IPV4}, 299 { "ip4", TOK_IPV4}, 300 { "dst-ipv6", TOK_DSTIP6}, 301 { "dst-ip6", TOK_DSTIP6}, 302 { "src-ipv6", TOK_SRCIP6}, 303 { "src-ip6", TOK_SRCIP6}, 304 { "lookup", TOK_LOOKUP}, 305 { "//", TOK_COMMENT }, 306 307 { "not", TOK_NOT }, /* pseudo option */ 308 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 309 { "or", TOK_OR }, /* pseudo option */ 310 { "|", /* escape */ TOK_OR }, /* pseudo option */ 311 { "{", TOK_STARTBRACE }, /* pseudo option */ 312 { "(", TOK_STARTBRACE }, /* pseudo option */ 313 { "}", TOK_ENDBRACE }, /* pseudo option */ 314 { ")", TOK_ENDBRACE }, /* pseudo option */ 315 { NULL, 0 } /* terminator */ 316}; 317 318/* 319 * Helper routine to print a possibly unaligned uint64_t on 320 * various platform. If width > 0, print the value with 321 * the desired width, followed by a space; 322 * otherwise, return the required width. 323 */ 324int 325pr_u64(uint64_t *pd, int width) 326{ 327#ifdef TCC 328#define U64_FMT "I64" 329#else 330#define U64_FMT "llu" 331#endif 332 uint64_t u; 333 unsigned long long d; 334 335 bcopy (pd, &u, sizeof(u)); 336 d = u; 337 return (width > 0) ? 338 printf("%*" U64_FMT " ", width, d) : 339 snprintf(NULL, 0, "%" U64_FMT, d) ; 340#undef U64_FMT 341} 342 343void * 344safe_calloc(size_t number, size_t size) 345{ 346 void *ret = calloc(number, size); 347 348 if (ret == NULL) 349 err(EX_OSERR, "calloc"); 350 return ret; 351} 352 353void * 354safe_realloc(void *ptr, size_t size) 355{ 356 void *ret = realloc(ptr, size); 357 358 if (ret == NULL) 359 err(EX_OSERR, "realloc"); 360 return ret; 361} 362 363/* 364 * conditionally runs the command. 365 * Selected options or negative -> getsockopt 366 */ 367int 368do_cmd(int optname, void *optval, uintptr_t optlen) 369{ 370 static int s = -1; /* the socket */ 371 int i; 372 373 if (co.test_only) 374 return 0; 375 376 if (s == -1) 377 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 378 if (s < 0) 379 err(EX_UNAVAILABLE, "socket"); 380 381 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 382 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 383 optname == IP_FW_TABLE_GETSIZE || 384 optname == IP_FW_NAT_GET_CONFIG || 385 optname < 0 || 386 optname == IP_FW_NAT_GET_LOG) { 387 if (optname < 0) 388 optname = -optname; 389 i = getsockopt(s, IPPROTO_IP, optname, optval, 390 (socklen_t *)optlen); 391 } else { 392 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 393 } 394 return i; 395} 396 397/** 398 * match_token takes a table and a string, returns the value associated 399 * with the string (-1 in case of failure). 400 */ 401int 402match_token(struct _s_x *table, char *string) 403{ 404 struct _s_x *pt; 405 uint i = strlen(string); 406 407 for (pt = table ; i && pt->s != NULL ; pt++) 408 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 409 return pt->x; 410 return -1; 411} 412 413/** 414 * match_value takes a table and a value, returns the string associated 415 * with the value (NULL in case of failure). 416 */ 417char const * 418match_value(struct _s_x *p, int value) 419{ 420 for (; p->s != NULL; p++) 421 if (p->x == value) 422 return p->s; 423 return NULL; 424} 425 426/* 427 * _substrcmp takes two strings and returns 1 if they do not match, 428 * and 0 if they match exactly or the first string is a sub-string 429 * of the second. A warning is printed to stderr in the case that the 430 * first string is a sub-string of the second. 431 * 432 * This function will be removed in the future through the usual 433 * deprecation process. 434 */ 435int 436_substrcmp(const char *str1, const char* str2) 437{ 438 439 if (strncmp(str1, str2, strlen(str1)) != 0) 440 return 1; 441 442 if (strlen(str1) != strlen(str2)) 443 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 444 str1, str2); 445 return 0; 446} 447 448/* 449 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 450 * and 0 if they match exactly or the second string is a sub-string 451 * of the first. A warning is printed to stderr in the case that the 452 * first string does not match the third. 453 * 454 * This function exists to warn about the bizzare construction 455 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 456 * for "bytes". The problem is that in addition to accepting "by", 457 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 458 * other string beginning with "by". 459 * 460 * This function will be removed in the future through the usual 461 * deprecation process. 462 */ 463int 464_substrcmp2(const char *str1, const char* str2, const char* str3) 465{ 466 467 if (strncmp(str1, str2, strlen(str2)) != 0) 468 return 1; 469 470 if (strcmp(str1, str3) != 0) 471 warnx("DEPRECATED: '%s' matched '%s'", 472 str1, str3); 473 return 0; 474} 475 476/* 477 * prints one port, symbolic or numeric 478 */ 479static void 480print_port(int proto, uint16_t port) 481{ 482 483 if (proto == IPPROTO_ETHERTYPE) { 484 char const *s; 485 486 if (co.do_resolv && (s = match_value(ether_types, port)) ) 487 printf("%s", s); 488 else 489 printf("0x%04x", port); 490 } else { 491 struct servent *se = NULL; 492 if (co.do_resolv) { 493 struct protoent *pe = getprotobynumber(proto); 494 495 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 496 } 497 if (se) 498 printf("%s", se->s_name); 499 else 500 printf("%d", port); 501 } 502} 503 504static struct _s_x _port_name[] = { 505 {"dst-port", O_IP_DSTPORT}, 506 {"src-port", O_IP_SRCPORT}, 507 {"ipid", O_IPID}, 508 {"iplen", O_IPLEN}, 509 {"ipttl", O_IPTTL}, 510 {"mac-type", O_MAC_TYPE}, 511 {"tcpdatalen", O_TCPDATALEN}, 512 {"tagged", O_TAGGED}, 513 {NULL, 0} 514}; 515 516/* 517 * Print the values in a list 16-bit items of the types above. 518 * XXX todo: add support for mask. 519 */ 520static void 521print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 522{ 523 uint16_t *p = cmd->ports; 524 int i; 525 char const *sep; 526 527 if (opcode != 0) { 528 sep = match_value(_port_name, opcode); 529 if (sep == NULL) 530 sep = "???"; 531 printf (" %s", sep); 532 } 533 sep = " "; 534 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 535 printf("%s", sep); 536 print_port(proto, p[0]); 537 if (p[0] != p[1]) { 538 printf("-"); 539 print_port(proto, p[1]); 540 } 541 sep = ","; 542 } 543} 544 545/* 546 * Like strtol, but also translates service names into port numbers 547 * for some protocols. 548 * In particular: 549 * proto == -1 disables the protocol check; 550 * proto == IPPROTO_ETHERTYPE looks up an internal table 551 * proto == <some value in /etc/protocols> matches the values there. 552 * Returns *end == s in case the parameter is not found. 553 */ 554static int 555strtoport(char *s, char **end, int base, int proto) 556{ 557 char *p, *buf; 558 char *s1; 559 int i; 560 561 *end = s; /* default - not found */ 562 if (*s == '\0') 563 return 0; /* not found */ 564 565 if (isdigit(*s)) 566 return strtol(s, end, base); 567 568 /* 569 * find separator. '\\' escapes the next char. 570 */ 571 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 572 if (*s1 == '\\' && s1[1] != '\0') 573 s1++; 574 575 buf = safe_calloc(s1 - s + 1, 1); 576 577 /* 578 * copy into a buffer skipping backslashes 579 */ 580 for (p = s, i = 0; p != s1 ; p++) 581 if (*p != '\\') 582 buf[i++] = *p; 583 buf[i++] = '\0'; 584 585 if (proto == IPPROTO_ETHERTYPE) { 586 i = match_token(ether_types, buf); 587 free(buf); 588 if (i != -1) { /* found */ 589 *end = s1; 590 return i; 591 } 592 } else { 593 struct protoent *pe = NULL; 594 struct servent *se; 595 596 if (proto != 0) 597 pe = getprotobynumber(proto); 598 setservent(1); 599 se = getservbyname(buf, pe ? pe->p_name : NULL); 600 free(buf); 601 if (se != NULL) { 602 *end = s1; 603 return ntohs(se->s_port); 604 } 605 } 606 return 0; /* not found */ 607} 608 609/* 610 * Fill the body of the command with the list of port ranges. 611 */ 612static int 613fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 614{ 615 uint16_t a, b, *p = cmd->ports; 616 int i = 0; 617 char *s = av; 618 619 while (*s) { 620 a = strtoport(av, &s, 0, proto); 621 if (s == av) /* empty or invalid argument */ 622 return (0); 623 624 switch (*s) { 625 case '-': /* a range */ 626 av = s + 1; 627 b = strtoport(av, &s, 0, proto); 628 /* Reject expressions like '1-abc' or '1-2-3'. */ 629 if (s == av || (*s != ',' && *s != '\0')) 630 return (0); 631 p[0] = a; 632 p[1] = b; 633 break; 634 case ',': /* comma separated list */ 635 case '\0': 636 p[0] = p[1] = a; 637 break; 638 default: 639 warnx("port list: invalid separator <%c> in <%s>", 640 *s, av); 641 return (0); 642 } 643 644 i++; 645 p += 2; 646 av = s + 1; 647 } 648 if (i > 0) { 649 if (i + 1 > F_LEN_MASK) 650 errx(EX_DATAERR, "too many ports/ranges\n"); 651 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 652 } 653 return (i); 654} 655 656static struct _s_x icmpcodes[] = { 657 { "net", ICMP_UNREACH_NET }, 658 { "host", ICMP_UNREACH_HOST }, 659 { "protocol", ICMP_UNREACH_PROTOCOL }, 660 { "port", ICMP_UNREACH_PORT }, 661 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 662 { "srcfail", ICMP_UNREACH_SRCFAIL }, 663 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 664 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 665 { "isolated", ICMP_UNREACH_ISOLATED }, 666 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 667 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 668 { "tosnet", ICMP_UNREACH_TOSNET }, 669 { "toshost", ICMP_UNREACH_TOSHOST }, 670 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 671 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 672 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 673 { NULL, 0 } 674}; 675 676static void 677fill_reject_code(u_short *codep, char *str) 678{ 679 int val; 680 char *s; 681 682 val = strtoul(str, &s, 0); 683 if (s == str || *s != '\0' || val >= 0x100) 684 val = match_token(icmpcodes, str); 685 if (val < 0) 686 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 687 *codep = val; 688 return; 689} 690 691static void 692print_reject_code(uint16_t code) 693{ 694 char const *s = match_value(icmpcodes, code); 695 696 if (s != NULL) 697 printf("unreach %s", s); 698 else 699 printf("unreach %u", code); 700} 701 702/* 703 * Returns the number of bits set (from left) in a contiguous bitmask, 704 * or -1 if the mask is not contiguous. 705 * XXX this needs a proper fix. 706 * This effectively works on masks in big-endian (network) format. 707 * when compiled on little endian architectures. 708 * 709 * First bit is bit 7 of the first byte -- note, for MAC addresses, 710 * the first bit on the wire is bit 0 of the first byte. 711 * len is the max length in bits. 712 */ 713int 714contigmask(uint8_t *p, int len) 715{ 716 int i, n; 717 718 for (i=0; i<len ; i++) 719 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 720 break; 721 for (n=i+1; n < len; n++) 722 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 723 return -1; /* mask not contiguous */ 724 return i; 725} 726 727/* 728 * print flags set/clear in the two bitmasks passed as parameters. 729 * There is a specialized check for f_tcpflags. 730 */ 731static void 732print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 733{ 734 char const *comma = ""; 735 int i; 736 uint8_t set = cmd->arg1 & 0xff; 737 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 738 739 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 740 printf(" setup"); 741 return; 742 } 743 744 printf(" %s ", name); 745 for (i=0; list[i].x != 0; i++) { 746 if (set & list[i].x) { 747 set &= ~list[i].x; 748 printf("%s%s", comma, list[i].s); 749 comma = ","; 750 } 751 if (clear & list[i].x) { 752 clear &= ~list[i].x; 753 printf("%s!%s", comma, list[i].s); 754 comma = ","; 755 } 756 } 757} 758 759/* 760 * Print the ip address contained in a command. 761 */ 762static void 763print_ip(ipfw_insn_ip *cmd, char const *s) 764{ 765 struct hostent *he = NULL; 766 uint32_t len = F_LEN((ipfw_insn *)cmd); 767 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 768 769 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 770 uint32_t d = a[1]; 771 const char *arg = "<invalid>"; 772 773 if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) 774 arg = match_value(rule_options, lookup_key[d]); 775 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "", 776 arg, cmd->o.arg1); 777 return; 778 } 779 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 780 781 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 782 printf("me"); 783 return; 784 } 785 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 786 cmd->o.opcode == O_IP_DST_LOOKUP) { 787 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 788 if (len == F_INSN_SIZE(ipfw_insn_u32)) 789 printf(",%u", *a); 790 printf(")"); 791 return; 792 } 793 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 794 uint32_t x, *map = (uint32_t *)&(cmd->mask); 795 int i, j; 796 char comma = '{'; 797 798 x = cmd->o.arg1 - 1; 799 x = htonl( ~x ); 800 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 801 printf("%s/%d", inet_ntoa(cmd->addr), 802 contigmask((uint8_t *)&x, 32)); 803 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 804 x &= 0xff; /* base */ 805 /* 806 * Print bits and ranges. 807 * Locate first bit set (i), then locate first bit unset (j). 808 * If we have 3+ consecutive bits set, then print them as a 809 * range, otherwise only print the initial bit and rescan. 810 */ 811 for (i=0; i < cmd->o.arg1; i++) 812 if (map[i/32] & (1<<(i & 31))) { 813 for (j=i+1; j < cmd->o.arg1; j++) 814 if (!(map[ j/32] & (1<<(j & 31)))) 815 break; 816 printf("%c%d", comma, i+x); 817 if (j>i+2) { /* range has at least 3 elements */ 818 printf("-%d", j-1+x); 819 i = j-1; 820 } 821 comma = ','; 822 } 823 printf("}"); 824 return; 825 } 826 /* 827 * len == 2 indicates a single IP, whereas lists of 1 or more 828 * addr/mask pairs have len = (2n+1). We convert len to n so we 829 * use that to count the number of entries. 830 */ 831 for (len = len / 2; len > 0; len--, a += 2) { 832 int mb = /* mask length */ 833 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 834 32 : contigmask((uint8_t *)&(a[1]), 32); 835 if (mb == 32 && co.do_resolv) 836 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 837 if (he != NULL) /* resolved to name */ 838 printf("%s", he->h_name); 839 else if (mb == 0) /* any */ 840 printf("any"); 841 else { /* numeric IP followed by some kind of mask */ 842 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 843 if (mb < 0) 844 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 845 else if (mb < 32) 846 printf("/%d", mb); 847 } 848 if (len > 1) 849 printf(","); 850 } 851} 852 853/* 854 * prints a MAC address/mask pair 855 */ 856static void 857print_mac(uint8_t *addr, uint8_t *mask) 858{ 859 int l = contigmask(mask, 48); 860 861 if (l == 0) 862 printf(" any"); 863 else { 864 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 865 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 866 if (l == -1) 867 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 868 mask[0], mask[1], mask[2], 869 mask[3], mask[4], mask[5]); 870 else if (l < 48) 871 printf("/%d", l); 872 } 873} 874 875static void 876fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 877{ 878 uint8_t type; 879 880 cmd->d[0] = 0; 881 while (*av) { 882 if (*av == ',') 883 av++; 884 885 type = strtoul(av, &av, 0); 886 887 if (*av != ',' && *av != '\0') 888 errx(EX_DATAERR, "invalid ICMP type"); 889 890 if (type > 31) 891 errx(EX_DATAERR, "ICMP type out of range"); 892 893 cmd->d[0] |= 1 << type; 894 } 895 cmd->o.opcode = O_ICMPTYPE; 896 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 897} 898 899static void 900print_icmptypes(ipfw_insn_u32 *cmd) 901{ 902 int i; 903 char sep= ' '; 904 905 printf(" icmptypes"); 906 for (i = 0; i < 32; i++) { 907 if ( (cmd->d[0] & (1 << (i))) == 0) 908 continue; 909 printf("%c%d", sep, i); 910 sep = ','; 911 } 912} 913 914/* 915 * show_ipfw() prints the body of an ipfw rule. 916 * Because the standard rule has at least proto src_ip dst_ip, we use 917 * a helper function to produce these entries if not provided explicitly. 918 * The first argument is the list of fields we have, the second is 919 * the list of fields we want to be printed. 920 * 921 * Special cases if we have provided a MAC header: 922 * + if the rule does not contain IP addresses/ports, do not print them; 923 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 924 * 925 * Once we have 'have_options', IP header fields are printed as options. 926 */ 927#define HAVE_PROTO 0x0001 928#define HAVE_SRCIP 0x0002 929#define HAVE_DSTIP 0x0004 930#define HAVE_PROTO4 0x0008 931#define HAVE_PROTO6 0x0010 932#define HAVE_IP 0x0100 933#define HAVE_OPTIONS 0x8000 934 935static void 936show_prerequisites(int *flags, int want, int cmd __unused) 937{ 938 if (co.comment_only) 939 return; 940 if ( (*flags & HAVE_IP) == HAVE_IP) 941 *flags |= HAVE_OPTIONS; 942 943 if ( !(*flags & HAVE_OPTIONS)) { 944 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 945 if ( (*flags & HAVE_PROTO4)) 946 printf(" ip4"); 947 else if ( (*flags & HAVE_PROTO6)) 948 printf(" ip6"); 949 else 950 printf(" ip"); 951 } 952 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 953 printf(" from any"); 954 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 955 printf(" to any"); 956 } 957 *flags |= want; 958} 959 960static void 961show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 962{ 963 static int twidth = 0; 964 int l; 965 ipfw_insn *cmd, *tagptr = NULL; 966 const char *comment = NULL; /* ptr to comment if we have one */ 967 int proto = 0; /* default */ 968 int flags = 0; /* prerequisites */ 969 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 970 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 971 int or_block = 0; /* we are in an or block */ 972 uint32_t set_disable; 973 974 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 975 976 if (set_disable & (1 << rule->set)) { /* disabled */ 977 if (!co.show_sets) 978 return; 979 else 980 printf("# DISABLED "); 981 } 982 printf("%05u ", rule->rulenum); 983 984 if (pcwidth > 0 || bcwidth > 0) { 985 pr_u64(&rule->pcnt, pcwidth); 986 pr_u64(&rule->bcnt, bcwidth); 987 } 988 989 if (co.do_time == 2) 990 printf("%10u ", rule->timestamp); 991 else if (co.do_time == 1) { 992 char timestr[30]; 993 time_t t = (time_t)0; 994 995 if (twidth == 0) { 996 strcpy(timestr, ctime(&t)); 997 *strchr(timestr, '\n') = '\0'; 998 twidth = strlen(timestr); 999 } 1000 if (rule->timestamp) { 1001 t = _long_to_time(rule->timestamp); 1002 1003 strcpy(timestr, ctime(&t)); 1004 *strchr(timestr, '\n') = '\0'; 1005 printf("%s ", timestr); 1006 } else { 1007 printf("%*s", twidth, " "); 1008 } 1009 } 1010 1011 if (co.show_sets) 1012 printf("set %d ", rule->set); 1013 1014 /* 1015 * print the optional "match probability" 1016 */ 1017 if (rule->cmd_len > 0) { 1018 cmd = rule->cmd ; 1019 if (cmd->opcode == O_PROB) { 1020 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1021 double d = 1.0 * p->d[0]; 1022 1023 d = (d / 0x7fffffff); 1024 printf("prob %f ", d); 1025 } 1026 } 1027 1028 /* 1029 * first print actions 1030 */ 1031 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1032 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1033 switch(cmd->opcode) { 1034 case O_CHECK_STATE: 1035 printf("check-state"); 1036 /* avoid printing anything else */ 1037 flags = HAVE_PROTO | HAVE_SRCIP | 1038 HAVE_DSTIP | HAVE_IP; 1039 break; 1040 1041 case O_ACCEPT: 1042 printf("allow"); 1043 break; 1044 1045 case O_COUNT: 1046 printf("count"); 1047 break; 1048 1049 case O_DENY: 1050 printf("deny"); 1051 break; 1052 1053 case O_REJECT: 1054 if (cmd->arg1 == ICMP_REJECT_RST) 1055 printf("reset"); 1056 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1057 printf("reject"); 1058 else 1059 print_reject_code(cmd->arg1); 1060 break; 1061 1062 case O_UNREACH6: 1063 if (cmd->arg1 == ICMP6_UNREACH_RST) 1064 printf("reset6"); 1065 else 1066 print_unreach6_code(cmd->arg1); 1067 break; 1068 1069 case O_SKIPTO: 1070 PRINT_UINT_ARG("skipto ", cmd->arg1); 1071 break; 1072 1073 case O_PIPE: 1074 PRINT_UINT_ARG("pipe ", cmd->arg1); 1075 break; 1076 1077 case O_QUEUE: 1078 PRINT_UINT_ARG("queue ", cmd->arg1); 1079 break; 1080 1081 case O_DIVERT: 1082 PRINT_UINT_ARG("divert ", cmd->arg1); 1083 break; 1084 1085 case O_TEE: 1086 PRINT_UINT_ARG("tee ", cmd->arg1); 1087 break; 1088 1089 case O_NETGRAPH: 1090 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1091 break; 1092 1093 case O_NGTEE: 1094 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1095 break; 1096 1097 case O_FORWARD_IP: 1098 { 1099 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1100 1101 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1102 printf("fwd tablearg"); 1103 } else { 1104 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1105 } 1106 if (s->sa.sin_port) 1107 printf(",%d", s->sa.sin_port); 1108 } 1109 break; 1110 1111 case O_LOG: /* O_LOG is printed last */ 1112 logptr = (ipfw_insn_log *)cmd; 1113 break; 1114 1115 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1116 altqptr = (ipfw_insn_altq *)cmd; 1117 break; 1118 1119 case O_TAG: 1120 tagptr = cmd; 1121 break; 1122 1123 case O_NAT: 1124 PRINT_UINT_ARG("nat ", cmd->arg1); 1125 break; 1126 1127 case O_SETFIB: 1128 PRINT_UINT_ARG("setfib ", cmd->arg1); 1129 break; 1130 1131 case O_REASS: 1132 printf("reass"); 1133 break; 1134 1135 default: 1136 printf("** unrecognized action %d len %d ", 1137 cmd->opcode, cmd->len); 1138 } 1139 } 1140 if (logptr) { 1141 if (logptr->max_log > 0) 1142 printf(" log logamount %d", logptr->max_log); 1143 else 1144 printf(" log"); 1145 } 1146#ifndef NO_ALTQ 1147 if (altqptr) { 1148 print_altq_cmd(altqptr); 1149 } 1150#endif 1151 if (tagptr) { 1152 if (tagptr->len & F_NOT) 1153 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1154 else 1155 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1156 } 1157 1158 /* 1159 * then print the body. 1160 */ 1161 for (l = rule->act_ofs, cmd = rule->cmd ; 1162 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1163 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1164 continue; 1165 if (cmd->opcode == O_IP4) { 1166 flags |= HAVE_PROTO4; 1167 break; 1168 } else if (cmd->opcode == O_IP6) { 1169 flags |= HAVE_PROTO6; 1170 break; 1171 } 1172 } 1173 if (rule->_pad & 1) { /* empty rules before options */ 1174 if (!co.do_compact) { 1175 show_prerequisites(&flags, HAVE_PROTO, 0); 1176 printf(" from any to any"); 1177 } 1178 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | 1179 HAVE_SRCIP | HAVE_DSTIP; 1180 } 1181 1182 if (co.comment_only) 1183 comment = "..."; 1184 1185 for (l = rule->act_ofs, cmd = rule->cmd ; 1186 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1187 /* useful alias */ 1188 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1189 1190 if (co.comment_only) { 1191 if (cmd->opcode != O_NOP) 1192 continue; 1193 printf(" // %s\n", (char *)(cmd + 1)); 1194 return; 1195 } 1196 1197 show_prerequisites(&flags, 0, cmd->opcode); 1198 1199 switch(cmd->opcode) { 1200 case O_PROB: 1201 break; /* done already */ 1202 1203 case O_PROBE_STATE: 1204 break; /* no need to print anything here */ 1205 1206 case O_IP_SRC: 1207 case O_IP_SRC_LOOKUP: 1208 case O_IP_SRC_MASK: 1209 case O_IP_SRC_ME: 1210 case O_IP_SRC_SET: 1211 show_prerequisites(&flags, HAVE_PROTO, 0); 1212 if (!(flags & HAVE_SRCIP)) 1213 printf(" from"); 1214 if ((cmd->len & F_OR) && !or_block) 1215 printf(" {"); 1216 print_ip((ipfw_insn_ip *)cmd, 1217 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1218 flags |= HAVE_SRCIP; 1219 break; 1220 1221 case O_IP_DST: 1222 case O_IP_DST_LOOKUP: 1223 case O_IP_DST_MASK: 1224 case O_IP_DST_ME: 1225 case O_IP_DST_SET: 1226 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1227 if (!(flags & HAVE_DSTIP)) 1228 printf(" to"); 1229 if ((cmd->len & F_OR) && !or_block) 1230 printf(" {"); 1231 print_ip((ipfw_insn_ip *)cmd, 1232 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1233 flags |= HAVE_DSTIP; 1234 break; 1235 1236 case O_IP6_SRC: 1237 case O_IP6_SRC_MASK: 1238 case O_IP6_SRC_ME: 1239 show_prerequisites(&flags, HAVE_PROTO, 0); 1240 if (!(flags & HAVE_SRCIP)) 1241 printf(" from"); 1242 if ((cmd->len & F_OR) && !or_block) 1243 printf(" {"); 1244 print_ip6((ipfw_insn_ip6 *)cmd, 1245 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1246 flags |= HAVE_SRCIP | HAVE_PROTO; 1247 break; 1248 1249 case O_IP6_DST: 1250 case O_IP6_DST_MASK: 1251 case O_IP6_DST_ME: 1252 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1253 if (!(flags & HAVE_DSTIP)) 1254 printf(" to"); 1255 if ((cmd->len & F_OR) && !or_block) 1256 printf(" {"); 1257 print_ip6((ipfw_insn_ip6 *)cmd, 1258 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1259 flags |= HAVE_DSTIP; 1260 break; 1261 1262 case O_FLOW6ID: 1263 print_flow6id( (ipfw_insn_u32 *) cmd ); 1264 flags |= HAVE_OPTIONS; 1265 break; 1266 1267 case O_IP_DSTPORT: 1268 show_prerequisites(&flags, 1269 HAVE_PROTO | HAVE_SRCIP | 1270 HAVE_DSTIP | HAVE_IP, 0); 1271 case O_IP_SRCPORT: 1272 show_prerequisites(&flags, 1273 HAVE_PROTO | HAVE_SRCIP, 0); 1274 if ((cmd->len & F_OR) && !or_block) 1275 printf(" {"); 1276 if (cmd->len & F_NOT) 1277 printf(" not"); 1278 print_newports((ipfw_insn_u16 *)cmd, proto, 1279 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1280 break; 1281 1282 case O_PROTO: { 1283 struct protoent *pe = NULL; 1284 1285 if ((cmd->len & F_OR) && !or_block) 1286 printf(" {"); 1287 if (cmd->len & F_NOT) 1288 printf(" not"); 1289 proto = cmd->arg1; 1290 pe = getprotobynumber(cmd->arg1); 1291 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1292 !(flags & HAVE_PROTO)) 1293 show_prerequisites(&flags, 1294 HAVE_PROTO | HAVE_IP | HAVE_SRCIP | 1295 HAVE_DSTIP | HAVE_OPTIONS, 0); 1296 if (flags & HAVE_OPTIONS) 1297 printf(" proto"); 1298 if (pe) 1299 printf(" %s", pe->p_name); 1300 else 1301 printf(" %u", cmd->arg1); 1302 } 1303 flags |= HAVE_PROTO; 1304 break; 1305 1306 default: /*options ... */ 1307 if (!(cmd->len & (F_OR|F_NOT))) 1308 if (((cmd->opcode == O_IP6) && 1309 (flags & HAVE_PROTO6)) || 1310 ((cmd->opcode == O_IP4) && 1311 (flags & HAVE_PROTO4))) 1312 break; 1313 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | 1314 HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); 1315 if ((cmd->len & F_OR) && !or_block) 1316 printf(" {"); 1317 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1318 printf(" not"); 1319 switch(cmd->opcode) { 1320 case O_MACADDR2: { 1321 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1322 1323 printf(" MAC"); 1324 print_mac(m->addr, m->mask); 1325 print_mac(m->addr + 6, m->mask + 6); 1326 } 1327 break; 1328 1329 case O_MAC_TYPE: 1330 print_newports((ipfw_insn_u16 *)cmd, 1331 IPPROTO_ETHERTYPE, cmd->opcode); 1332 break; 1333 1334 1335 case O_FRAG: 1336 printf(" frag"); 1337 break; 1338 1339 case O_FIB: 1340 printf(" fib %u", cmd->arg1 ); 1341 break; 1342 case O_SOCKARG: 1343 printf(" sockarg"); 1344 break; 1345 1346 case O_IN: 1347 printf(cmd->len & F_NOT ? " out" : " in"); 1348 break; 1349 1350 case O_DIVERTED: 1351 switch (cmd->arg1) { 1352 case 3: 1353 printf(" diverted"); 1354 break; 1355 case 1: 1356 printf(" diverted-loopback"); 1357 break; 1358 case 2: 1359 printf(" diverted-output"); 1360 break; 1361 default: 1362 printf(" diverted-?<%u>", cmd->arg1); 1363 break; 1364 } 1365 break; 1366 1367 case O_LAYER2: 1368 printf(" layer2"); 1369 break; 1370 case O_XMIT: 1371 case O_RECV: 1372 case O_VIA: 1373 { 1374 char const *s; 1375 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1376 1377 if (cmd->opcode == O_XMIT) 1378 s = "xmit"; 1379 else if (cmd->opcode == O_RECV) 1380 s = "recv"; 1381 else /* if (cmd->opcode == O_VIA) */ 1382 s = "via"; 1383 if (cmdif->name[0] == '\0') 1384 printf(" %s %s", s, 1385 inet_ntoa(cmdif->p.ip)); 1386 else 1387 printf(" %s %s", s, cmdif->name); 1388 1389 break; 1390 } 1391 case O_IPID: 1392 if (F_LEN(cmd) == 1) 1393 printf(" ipid %u", cmd->arg1 ); 1394 else 1395 print_newports((ipfw_insn_u16 *)cmd, 0, 1396 O_IPID); 1397 break; 1398 1399 case O_IPTTL: 1400 if (F_LEN(cmd) == 1) 1401 printf(" ipttl %u", cmd->arg1 ); 1402 else 1403 print_newports((ipfw_insn_u16 *)cmd, 0, 1404 O_IPTTL); 1405 break; 1406 1407 case O_IPVER: 1408 printf(" ipver %u", cmd->arg1 ); 1409 break; 1410 1411 case O_IPPRECEDENCE: 1412 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1413 break; 1414 1415 case O_IPLEN: 1416 if (F_LEN(cmd) == 1) 1417 printf(" iplen %u", cmd->arg1 ); 1418 else 1419 print_newports((ipfw_insn_u16 *)cmd, 0, 1420 O_IPLEN); 1421 break; 1422 1423 case O_IPOPT: 1424 print_flags("ipoptions", cmd, f_ipopts); 1425 break; 1426 1427 case O_IPTOS: 1428 print_flags("iptos", cmd, f_iptos); 1429 break; 1430 1431 case O_ICMPTYPE: 1432 print_icmptypes((ipfw_insn_u32 *)cmd); 1433 break; 1434 1435 case O_ESTAB: 1436 printf(" established"); 1437 break; 1438 1439 case O_TCPDATALEN: 1440 if (F_LEN(cmd) == 1) 1441 printf(" tcpdatalen %u", cmd->arg1 ); 1442 else 1443 print_newports((ipfw_insn_u16 *)cmd, 0, 1444 O_TCPDATALEN); 1445 break; 1446 1447 case O_TCPFLAGS: 1448 print_flags("tcpflags", cmd, f_tcpflags); 1449 break; 1450 1451 case O_TCPOPTS: 1452 print_flags("tcpoptions", cmd, f_tcpopts); 1453 break; 1454 1455 case O_TCPWIN: 1456 printf(" tcpwin %d", ntohs(cmd->arg1)); 1457 break; 1458 1459 case O_TCPACK: 1460 printf(" tcpack %d", ntohl(cmd32->d[0])); 1461 break; 1462 1463 case O_TCPSEQ: 1464 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1465 break; 1466 1467 case O_UID: 1468 { 1469 struct passwd *pwd = getpwuid(cmd32->d[0]); 1470 1471 if (pwd) 1472 printf(" uid %s", pwd->pw_name); 1473 else 1474 printf(" uid %u", cmd32->d[0]); 1475 } 1476 break; 1477 1478 case O_GID: 1479 { 1480 struct group *grp = getgrgid(cmd32->d[0]); 1481 1482 if (grp) 1483 printf(" gid %s", grp->gr_name); 1484 else 1485 printf(" gid %u", cmd32->d[0]); 1486 } 1487 break; 1488 1489 case O_JAIL: 1490 printf(" jail %d", cmd32->d[0]); 1491 break; 1492 1493 case O_VERREVPATH: 1494 printf(" verrevpath"); 1495 break; 1496 1497 case O_VERSRCREACH: 1498 printf(" versrcreach"); 1499 break; 1500 1501 case O_ANTISPOOF: 1502 printf(" antispoof"); 1503 break; 1504 1505 case O_IPSEC: 1506 printf(" ipsec"); 1507 break; 1508 1509 case O_NOP: 1510 comment = (char *)(cmd + 1); 1511 break; 1512 1513 case O_KEEP_STATE: 1514 printf(" keep-state"); 1515 break; 1516 1517 case O_LIMIT: { 1518 struct _s_x *p = limit_masks; 1519 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1520 uint8_t x = c->limit_mask; 1521 char const *comma = " "; 1522 1523 printf(" limit"); 1524 for (; p->x != 0 ; p++) 1525 if ((x & p->x) == p->x) { 1526 x &= ~p->x; 1527 printf("%s%s", comma, p->s); 1528 comma = ","; 1529 } 1530 PRINT_UINT_ARG(" ", c->conn_limit); 1531 break; 1532 } 1533 1534 case O_IP6: 1535 printf(" ip6"); 1536 break; 1537 1538 case O_IP4: 1539 printf(" ip4"); 1540 break; 1541 1542 case O_ICMP6TYPE: 1543 print_icmp6types((ipfw_insn_u32 *)cmd); 1544 break; 1545 1546 case O_EXT_HDR: 1547 print_ext6hdr( (ipfw_insn *) cmd ); 1548 break; 1549 1550 case O_TAGGED: 1551 if (F_LEN(cmd) == 1) 1552 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1553 else 1554 print_newports((ipfw_insn_u16 *)cmd, 0, 1555 O_TAGGED); 1556 break; 1557 1558 default: 1559 printf(" [opcode %d len %d]", 1560 cmd->opcode, cmd->len); 1561 } 1562 } 1563 if (cmd->len & F_OR) { 1564 printf(" or"); 1565 or_block = 1; 1566 } else if (or_block) { 1567 printf(" }"); 1568 or_block = 0; 1569 } 1570 } 1571 show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP 1572 | HAVE_IP, 0); 1573 if (comment) 1574 printf(" // %s", comment); 1575 printf("\n"); 1576} 1577 1578static void 1579show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1580{ 1581 struct protoent *pe; 1582 struct in_addr a; 1583 uint16_t rulenum; 1584 char buf[INET6_ADDRSTRLEN]; 1585 1586 if (!co.do_expired) { 1587 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1588 return; 1589 } 1590 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1591 printf("%05d", rulenum); 1592 if (pcwidth > 0 || bcwidth > 0) { 1593 printf(" "); 1594 pr_u64(&d->pcnt, pcwidth); 1595 pr_u64(&d->bcnt, bcwidth); 1596 printf("(%ds)", d->expire); 1597 } 1598 switch (d->dyn_type) { 1599 case O_LIMIT_PARENT: 1600 printf(" PARENT %d", d->count); 1601 break; 1602 case O_LIMIT: 1603 printf(" LIMIT"); 1604 break; 1605 case O_KEEP_STATE: /* bidir, no mask */ 1606 printf(" STATE"); 1607 break; 1608 } 1609 1610 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1611 printf(" %s", pe->p_name); 1612 else 1613 printf(" proto %u", d->id.proto); 1614 1615 if (d->id.addr_type == 4) { 1616 a.s_addr = htonl(d->id.src_ip); 1617 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1618 1619 a.s_addr = htonl(d->id.dst_ip); 1620 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1621 } else if (d->id.addr_type == 6) { 1622 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1623 sizeof(buf)), d->id.src_port); 1624 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1625 sizeof(buf)), d->id.dst_port); 1626 } else 1627 printf(" UNKNOWN <-> UNKNOWN\n"); 1628 1629 printf("\n"); 1630} 1631 1632/* 1633 * This one handles all set-related commands 1634 * ipfw set { show | enable | disable } 1635 * ipfw set swap X Y 1636 * ipfw set move X to Y 1637 * ipfw set move rule X to Y 1638 */ 1639void 1640ipfw_sets_handler(char *av[]) 1641{ 1642 uint32_t set_disable, masks[2]; 1643 int i, nbytes; 1644 uint16_t rulenum; 1645 uint8_t cmd, new_set; 1646 1647 av++; 1648 1649 if (av[0] == NULL) 1650 errx(EX_USAGE, "set needs command"); 1651 if (_substrcmp(*av, "show") == 0) { 1652 void *data = NULL; 1653 char const *msg; 1654 int nalloc; 1655 1656 nalloc = nbytes = sizeof(struct ip_fw); 1657 while (nbytes >= nalloc) { 1658 if (data) 1659 free(data); 1660 nalloc = nalloc * 2 + 200; 1661 nbytes = nalloc; 1662 data = safe_calloc(1, nbytes); 1663 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1664 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1665 } 1666 1667 bcopy(&((struct ip_fw *)data)->next_rule, 1668 &set_disable, sizeof(set_disable)); 1669 1670 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1671 if ((set_disable & (1<<i))) { 1672 printf("%s %d", msg, i); 1673 msg = ""; 1674 } 1675 msg = (set_disable) ? " enable" : "enable"; 1676 for (i = 0; i < RESVD_SET; i++) 1677 if (!(set_disable & (1<<i))) { 1678 printf("%s %d", msg, i); 1679 msg = ""; 1680 } 1681 printf("\n"); 1682 } else if (_substrcmp(*av, "swap") == 0) { 1683 av++; 1684 if ( av[0] == NULL || av[1] == NULL ) 1685 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1686 rulenum = atoi(av[0]); 1687 new_set = atoi(av[1]); 1688 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1689 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1690 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1691 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1692 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1693 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1694 } else if (_substrcmp(*av, "move") == 0) { 1695 av++; 1696 if (av[0] && _substrcmp(*av, "rule") == 0) { 1697 cmd = 2; 1698 av++; 1699 } else 1700 cmd = 3; 1701 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 1702 av[3] != NULL || _substrcmp(av[1], "to") != 0) 1703 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1704 rulenum = atoi(av[0]); 1705 new_set = atoi(av[2]); 1706 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1707 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1708 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1709 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1710 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1711 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1712 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1713 } else if (_substrcmp(*av, "disable") == 0 || 1714 _substrcmp(*av, "enable") == 0 ) { 1715 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1716 1717 av++; 1718 masks[0] = masks[1] = 0; 1719 1720 while (av[0]) { 1721 if (isdigit(**av)) { 1722 i = atoi(*av); 1723 if (i < 0 || i > RESVD_SET) 1724 errx(EX_DATAERR, 1725 "invalid set number %d\n", i); 1726 masks[which] |= (1<<i); 1727 } else if (_substrcmp(*av, "disable") == 0) 1728 which = 0; 1729 else if (_substrcmp(*av, "enable") == 0) 1730 which = 1; 1731 else 1732 errx(EX_DATAERR, 1733 "invalid set command %s\n", *av); 1734 av++; 1735 } 1736 if ( (masks[0] & masks[1]) != 0 ) 1737 errx(EX_DATAERR, 1738 "cannot enable and disable the same set\n"); 1739 1740 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1741 if (i) 1742 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1743 } else 1744 errx(EX_USAGE, "invalid set command %s\n", *av); 1745} 1746 1747void 1748ipfw_sysctl_handler(char *av[], int which) 1749{ 1750 av++; 1751 1752 if (av[0] == NULL) { 1753 warnx("missing keyword to enable/disable\n"); 1754 } else if (_substrcmp(*av, "firewall") == 0) { 1755 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1756 &which, sizeof(which)); 1757 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 1758 &which, sizeof(which)); 1759 } else if (_substrcmp(*av, "one_pass") == 0) { 1760 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1761 &which, sizeof(which)); 1762 } else if (_substrcmp(*av, "debug") == 0) { 1763 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1764 &which, sizeof(which)); 1765 } else if (_substrcmp(*av, "verbose") == 0) { 1766 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1767 &which, sizeof(which)); 1768 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1769 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1770 &which, sizeof(which)); 1771#ifndef NO_ALTQ 1772 } else if (_substrcmp(*av, "altq") == 0) { 1773 altq_set_enabled(which); 1774#endif 1775 } else { 1776 warnx("unrecognize enable/disable keyword: %s\n", *av); 1777 } 1778} 1779 1780void 1781ipfw_list(int ac, char *av[], int show_counters) 1782{ 1783 struct ip_fw *r; 1784 ipfw_dyn_rule *dynrules, *d; 1785 1786#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1787 char *lim; 1788 void *data = NULL; 1789 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1790 int exitval = EX_OK; 1791 int lac; 1792 char **lav; 1793 u_long rnum, last; 1794 char *endptr; 1795 int seen = 0; 1796 uint8_t set; 1797 1798 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1799 int nalloc = 1024; /* start somewhere... */ 1800 1801 last = 0; 1802 1803 if (co.test_only) { 1804 fprintf(stderr, "Testing only, list disabled\n"); 1805 return; 1806 } 1807 if (co.do_pipe) { 1808 dummynet_list(ac, av, show_counters); 1809 return; 1810 } 1811 1812 ac--; 1813 av++; 1814 1815 /* get rules or pipes from kernel, resizing array as necessary */ 1816 nbytes = nalloc; 1817 1818 while (nbytes >= nalloc) { 1819 nalloc = nalloc * 2 + 200; 1820 nbytes = nalloc; 1821 data = safe_realloc(data, nbytes); 1822 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1823 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1824 co.do_pipe ? "DUMMYNET" : "FW"); 1825 } 1826 1827 /* 1828 * Count static rules. They have variable size so we 1829 * need to scan the list to count them. 1830 */ 1831 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1832 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1833 ++nstat, r = NEXT(r) ) 1834 ; /* nothing */ 1835 1836 /* 1837 * Count dynamic rules. This is easier as they have 1838 * fixed size. 1839 */ 1840 r = NEXT(r); 1841 dynrules = (ipfw_dyn_rule *)r ; 1842 n = (char *)r - (char *)data; 1843 ndyn = (nbytes - n) / sizeof *dynrules; 1844 1845 /* if showing stats, figure out column widths ahead of time */ 1846 bcwidth = pcwidth = 0; 1847 if (show_counters) { 1848 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1849 /* skip rules from another set */ 1850 if (co.use_set && r->set != co.use_set - 1) 1851 continue; 1852 1853 /* packet counter */ 1854 width = pr_u64(&r->pcnt, 0); 1855 if (width > pcwidth) 1856 pcwidth = width; 1857 1858 /* byte counter */ 1859 width = pr_u64(&r->bcnt, 0); 1860 if (width > bcwidth) 1861 bcwidth = width; 1862 } 1863 } 1864 if (co.do_dynamic && ndyn) { 1865 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1866 if (co.use_set) { 1867 /* skip rules from another set */ 1868 bcopy((char *)&d->rule + sizeof(uint16_t), 1869 &set, sizeof(uint8_t)); 1870 if (set != co.use_set - 1) 1871 continue; 1872 } 1873 width = pr_u64(&d->pcnt, 0); 1874 if (width > pcwidth) 1875 pcwidth = width; 1876 1877 width = pr_u64(&d->bcnt, 0); 1878 if (width > bcwidth) 1879 bcwidth = width; 1880 } 1881 } 1882 /* if no rule numbers were specified, list all rules */ 1883 if (ac == 0) { 1884 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1885 if (co.use_set && r->set != co.use_set - 1) 1886 continue; 1887 show_ipfw(r, pcwidth, bcwidth); 1888 } 1889 1890 if (co.do_dynamic && ndyn) { 1891 printf("## Dynamic rules (%d):\n", ndyn); 1892 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1893 if (co.use_set) { 1894 bcopy((char *)&d->rule + sizeof(uint16_t), 1895 &set, sizeof(uint8_t)); 1896 if (set != co.use_set - 1) 1897 continue; 1898 } 1899 show_dyn_ipfw(d, pcwidth, bcwidth); 1900 } 1901 } 1902 goto done; 1903 } 1904 1905 /* display specific rules requested on command line */ 1906 1907 for (lac = ac, lav = av; lac != 0; lac--) { 1908 /* convert command line rule # */ 1909 last = rnum = strtoul(*lav++, &endptr, 10); 1910 if (*endptr == '-') 1911 last = strtoul(endptr+1, &endptr, 10); 1912 if (*endptr) { 1913 exitval = EX_USAGE; 1914 warnx("invalid rule number: %s", *(lav - 1)); 1915 continue; 1916 } 1917 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1918 if (r->rulenum > last) 1919 break; 1920 if (co.use_set && r->set != co.use_set - 1) 1921 continue; 1922 if (r->rulenum >= rnum && r->rulenum <= last) { 1923 show_ipfw(r, pcwidth, bcwidth); 1924 seen = 1; 1925 } 1926 } 1927 if (!seen) { 1928 /* give precedence to other error(s) */ 1929 if (exitval == EX_OK) 1930 exitval = EX_UNAVAILABLE; 1931 warnx("rule %lu does not exist", rnum); 1932 } 1933 } 1934 1935 if (co.do_dynamic && ndyn) { 1936 printf("## Dynamic rules:\n"); 1937 for (lac = ac, lav = av; lac != 0; lac--) { 1938 last = rnum = strtoul(*lav++, &endptr, 10); 1939 if (*endptr == '-') 1940 last = strtoul(endptr+1, &endptr, 10); 1941 if (*endptr) 1942 /* already warned */ 1943 continue; 1944 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1945 uint16_t rulenum; 1946 1947 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1948 if (rulenum > rnum) 1949 break; 1950 if (co.use_set) { 1951 bcopy((char *)&d->rule + sizeof(uint16_t), 1952 &set, sizeof(uint8_t)); 1953 if (set != co.use_set - 1) 1954 continue; 1955 } 1956 if (r->rulenum >= rnum && r->rulenum <= last) 1957 show_dyn_ipfw(d, pcwidth, bcwidth); 1958 } 1959 } 1960 } 1961 1962 ac = 0; 1963 1964done: 1965 free(data); 1966 1967 if (exitval != EX_OK) 1968 exit(exitval); 1969#undef NEXT 1970} 1971 1972static int 1973lookup_host (char *host, struct in_addr *ipaddr) 1974{ 1975 struct hostent *he; 1976 1977 if (!inet_aton(host, ipaddr)) { 1978 if ((he = gethostbyname(host)) == NULL) 1979 return(-1); 1980 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1981 } 1982 return(0); 1983} 1984 1985/* 1986 * fills the addr and mask fields in the instruction as appropriate from av. 1987 * Update length as appropriate. 1988 * The following formats are allowed: 1989 * me returns O_IP_*_ME 1990 * 1.2.3.4 single IP address 1991 * 1.2.3.4:5.6.7.8 address:mask 1992 * 1.2.3.4/24 address/mask 1993 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1994 * We can have multiple comma-separated address/mask entries. 1995 */ 1996static void 1997fill_ip(ipfw_insn_ip *cmd, char *av) 1998{ 1999 int len = 0; 2000 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2001 2002 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 2003 2004 if (_substrcmp(av, "any") == 0) 2005 return; 2006 2007 if (_substrcmp(av, "me") == 0) { 2008 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2009 return; 2010 } 2011 2012 if (strncmp(av, "table(", 6) == 0) { 2013 char *p = strchr(av + 6, ','); 2014 2015 if (p) 2016 *p++ = '\0'; 2017 cmd->o.opcode = O_IP_DST_LOOKUP; 2018 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 2019 if (p) { 2020 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2021 d[0] = strtoul(p, NULL, 0); 2022 } else 2023 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2024 return; 2025 } 2026 2027 while (av) { 2028 /* 2029 * After the address we can have '/' or ':' indicating a mask, 2030 * ',' indicating another address follows, '{' indicating a 2031 * set of addresses of unspecified size. 2032 */ 2033 char *t = NULL, *p = strpbrk(av, "/:,{"); 2034 int masklen; 2035 char md, nd = '\0'; 2036 2037 if (p) { 2038 md = *p; 2039 *p++ = '\0'; 2040 if ((t = strpbrk(p, ",{")) != NULL) { 2041 nd = *t; 2042 *t = '\0'; 2043 } 2044 } else 2045 md = '\0'; 2046 2047 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2048 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2049 switch (md) { 2050 case ':': 2051 if (!inet_aton(p, (struct in_addr *)&d[1])) 2052 errx(EX_DATAERR, "bad netmask ``%s''", p); 2053 break; 2054 case '/': 2055 masklen = atoi(p); 2056 if (masklen == 0) 2057 d[1] = htonl(0); /* mask */ 2058 else if (masklen > 32) 2059 errx(EX_DATAERR, "bad width ``%s''", p); 2060 else 2061 d[1] = htonl(~0 << (32 - masklen)); 2062 break; 2063 case '{': /* no mask, assume /24 and put back the '{' */ 2064 d[1] = htonl(~0 << (32 - 24)); 2065 *(--p) = md; 2066 break; 2067 2068 case ',': /* single address plus continuation */ 2069 *(--p) = md; 2070 /* FALLTHROUGH */ 2071 case 0: /* initialization value */ 2072 default: 2073 d[1] = htonl(~0); /* force /32 */ 2074 break; 2075 } 2076 d[0] &= d[1]; /* mask base address with mask */ 2077 if (t) 2078 *t = nd; 2079 /* find next separator */ 2080 if (p) 2081 p = strpbrk(p, ",{"); 2082 if (p && *p == '{') { 2083 /* 2084 * We have a set of addresses. They are stored as follows: 2085 * arg1 is the set size (powers of 2, 2..256) 2086 * addr is the base address IN HOST FORMAT 2087 * mask.. is an array of arg1 bits (rounded up to 2088 * the next multiple of 32) with bits set 2089 * for each host in the map. 2090 */ 2091 uint32_t *map = (uint32_t *)&cmd->mask; 2092 int low, high; 2093 int i = contigmask((uint8_t *)&(d[1]), 32); 2094 2095 if (len > 0) 2096 errx(EX_DATAERR, "address set cannot be in a list"); 2097 if (i < 24 || i > 31) 2098 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2099 cmd->o.arg1 = 1<<(32-i); /* map length */ 2100 d[0] = ntohl(d[0]); /* base addr in host format */ 2101 cmd->o.opcode = O_IP_DST_SET; /* default */ 2102 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2103 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2104 map[i] = 0; /* clear map */ 2105 2106 av = p + 1; 2107 low = d[0] & 0xff; 2108 high = low + cmd->o.arg1 - 1; 2109 /* 2110 * Here, i stores the previous value when we specify a range 2111 * of addresses within a mask, e.g. 45-63. i = -1 means we 2112 * have no previous value. 2113 */ 2114 i = -1; /* previous value in a range */ 2115 while (isdigit(*av)) { 2116 char *s; 2117 int a = strtol(av, &s, 0); 2118 2119 if (s == av) { /* no parameter */ 2120 if (*av != '}') 2121 errx(EX_DATAERR, "set not closed\n"); 2122 if (i != -1) 2123 errx(EX_DATAERR, "incomplete range %d-", i); 2124 break; 2125 } 2126 if (a < low || a > high) 2127 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2128 a, low, high); 2129 a -= low; 2130 if (i == -1) /* no previous in range */ 2131 i = a; 2132 else { /* check that range is valid */ 2133 if (i > a) 2134 errx(EX_DATAERR, "invalid range %d-%d", 2135 i+low, a+low); 2136 if (*s == '-') 2137 errx(EX_DATAERR, "double '-' in range"); 2138 } 2139 for (; i <= a; i++) 2140 map[i/32] |= 1<<(i & 31); 2141 i = -1; 2142 if (*s == '-') 2143 i = a; 2144 else if (*s == '}') 2145 break; 2146 av = s+1; 2147 } 2148 return; 2149 } 2150 av = p; 2151 if (av) /* then *av must be a ',' */ 2152 av++; 2153 2154 /* Check this entry */ 2155 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2156 /* 2157 * 'any' turns the entire list into a NOP. 2158 * 'not any' never matches, so it is removed from the 2159 * list unless it is the only item, in which case we 2160 * report an error. 2161 */ 2162 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2163 if (av == NULL && len == 0) /* only this entry */ 2164 errx(EX_DATAERR, "not any never matches"); 2165 } 2166 /* else do nothing and skip this entry */ 2167 return; 2168 } 2169 /* A single IP can be stored in an optimized format */ 2170 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2171 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2172 return; 2173 } 2174 len += 2; /* two words... */ 2175 d += 2; 2176 } /* end while */ 2177 if (len + 1 > F_LEN_MASK) 2178 errx(EX_DATAERR, "address list too long"); 2179 cmd->o.len |= len+1; 2180} 2181 2182 2183/* n2mask sets n bits of the mask */ 2184void 2185n2mask(struct in6_addr *mask, int n) 2186{ 2187 static int minimask[9] = 2188 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2189 u_char *p; 2190 2191 memset(mask, 0, sizeof(struct in6_addr)); 2192 p = (u_char *) mask; 2193 for (; n > 0; p++, n -= 8) { 2194 if (n >= 8) 2195 *p = 0xff; 2196 else 2197 *p = minimask[n]; 2198 } 2199 return; 2200} 2201 2202 2203/* 2204 * helper function to process a set of flags and set bits in the 2205 * appropriate masks. 2206 */ 2207static void 2208fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2209 struct _s_x *flags, char *p) 2210{ 2211 uint8_t set=0, clear=0; 2212 2213 while (p && *p) { 2214 char *q; /* points to the separator */ 2215 int val; 2216 uint8_t *which; /* mask we are working on */ 2217 2218 if (*p == '!') { 2219 p++; 2220 which = &clear; 2221 } else 2222 which = &set; 2223 q = strchr(p, ','); 2224 if (q) 2225 *q++ = '\0'; 2226 val = match_token(flags, p); 2227 if (val <= 0) 2228 errx(EX_DATAERR, "invalid flag %s", p); 2229 *which |= (uint8_t)val; 2230 p = q; 2231 } 2232 cmd->opcode = opcode; 2233 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2234 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2235} 2236 2237 2238void 2239ipfw_delete(char *av[]) 2240{ 2241 uint32_t rulenum; 2242 int i; 2243 int exitval = EX_OK; 2244 int do_set = 0; 2245 2246 av++; 2247 NEED1("missing rule specification"); 2248 if ( *av && _substrcmp(*av, "set") == 0) { 2249 /* Do not allow using the following syntax: 2250 * ipfw set N delete set M 2251 */ 2252 if (co.use_set) 2253 errx(EX_DATAERR, "invalid syntax"); 2254 do_set = 1; /* delete set */ 2255 av++; 2256 } 2257 2258 /* Rule number */ 2259 while (*av && isdigit(**av)) { 2260 i = atoi(*av); av++; 2261 if (co.do_nat) { 2262 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2263 if (exitval) { 2264 exitval = EX_UNAVAILABLE; 2265 warn("rule %u not available", i); 2266 } 2267 } else if (co.do_pipe) { 2268 exitval = ipfw_delete_pipe(co.do_pipe, i); 2269 } else { 2270 if (co.use_set) 2271 rulenum = (i & 0xffff) | (5 << 24) | 2272 ((co.use_set - 1) << 16); 2273 else 2274 rulenum = (i & 0xffff) | (do_set << 24); 2275 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2276 if (i) { 2277 exitval = EX_UNAVAILABLE; 2278 warn("rule %u: setsockopt(IP_FW_DEL)", 2279 rulenum); 2280 } 2281 } 2282 } 2283 if (exitval != EX_OK) 2284 exit(exitval); 2285} 2286 2287 2288/* 2289 * fill the interface structure. We do not check the name as we can 2290 * create interfaces dynamically, so checking them at insert time 2291 * makes relatively little sense. 2292 * Interface names containing '*', '?', or '[' are assumed to be shell 2293 * patterns which match interfaces. 2294 */ 2295static void 2296fill_iface(ipfw_insn_if *cmd, char *arg) 2297{ 2298 cmd->name[0] = '\0'; 2299 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2300 2301 /* Parse the interface or address */ 2302 if (strcmp(arg, "any") == 0) 2303 cmd->o.len = 0; /* effectively ignore this command */ 2304 else if (!isdigit(*arg)) { 2305 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2306 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2307 } else if (!inet_aton(arg, &cmd->p.ip)) 2308 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2309} 2310 2311static void 2312get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2313{ 2314 int i; 2315 size_t l; 2316 char *ap, *ptr, *optr; 2317 struct ether_addr *mac; 2318 const char *macset = "0123456789abcdefABCDEF:"; 2319 2320 if (strcmp(p, "any") == 0) { 2321 for (i = 0; i < ETHER_ADDR_LEN; i++) 2322 addr[i] = mask[i] = 0; 2323 return; 2324 } 2325 2326 optr = ptr = strdup(p); 2327 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2328 l = strlen(ap); 2329 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2330 errx(EX_DATAERR, "Incorrect MAC address"); 2331 bcopy(mac, addr, ETHER_ADDR_LEN); 2332 } else 2333 errx(EX_DATAERR, "Incorrect MAC address"); 2334 2335 if (ptr != NULL) { /* we have mask? */ 2336 if (p[ptr - optr - 1] == '/') { /* mask len */ 2337 long ml = strtol(ptr, &ap, 10); 2338 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 2339 errx(EX_DATAERR, "Incorrect mask length"); 2340 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 2341 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 2342 } else { /* mask */ 2343 l = strlen(ptr); 2344 if (strspn(ptr, macset) != l || 2345 (mac = ether_aton(ptr)) == NULL) 2346 errx(EX_DATAERR, "Incorrect mask"); 2347 bcopy(mac, mask, ETHER_ADDR_LEN); 2348 } 2349 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2350 for (i = 0; i < ETHER_ADDR_LEN; i++) 2351 mask[i] = 0xff; 2352 } 2353 for (i = 0; i < ETHER_ADDR_LEN; i++) 2354 addr[i] &= mask[i]; 2355 2356 free(optr); 2357} 2358 2359/* 2360 * helper function, updates the pointer to cmd with the length 2361 * of the current command, and also cleans up the first word of 2362 * the new command in case it has been clobbered before. 2363 */ 2364static ipfw_insn * 2365next_cmd(ipfw_insn *cmd) 2366{ 2367 cmd += F_LEN(cmd); 2368 bzero(cmd, sizeof(*cmd)); 2369 return cmd; 2370} 2371 2372/* 2373 * Takes arguments and copies them into a comment 2374 */ 2375static void 2376fill_comment(ipfw_insn *cmd, char **av) 2377{ 2378 int i, l; 2379 char *p = (char *)(cmd + 1); 2380 2381 cmd->opcode = O_NOP; 2382 cmd->len = (cmd->len & (F_NOT | F_OR)); 2383 2384 /* Compute length of comment string. */ 2385 for (i = 0, l = 0; av[i] != NULL; i++) 2386 l += strlen(av[i]) + 1; 2387 if (l == 0) 2388 return; 2389 if (l > 84) 2390 errx(EX_DATAERR, 2391 "comment too long (max 80 chars)"); 2392 l = 1 + (l+3)/4; 2393 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2394 for (i = 0; av[i] != NULL; i++) { 2395 strcpy(p, av[i]); 2396 p += strlen(av[i]); 2397 *p++ = ' '; 2398 } 2399 *(--p) = '\0'; 2400} 2401 2402/* 2403 * A function to fill simple commands of size 1. 2404 * Existing flags are preserved. 2405 */ 2406static void 2407fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2408{ 2409 cmd->opcode = opcode; 2410 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2411 cmd->arg1 = arg; 2412} 2413 2414/* 2415 * Fetch and add the MAC address and type, with masks. This generates one or 2416 * two microinstructions, and returns the pointer to the last one. 2417 */ 2418static ipfw_insn * 2419add_mac(ipfw_insn *cmd, char *av[]) 2420{ 2421 ipfw_insn_mac *mac; 2422 2423 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 2424 errx(EX_DATAERR, "MAC dst src"); 2425 2426 cmd->opcode = O_MACADDR2; 2427 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2428 2429 mac = (ipfw_insn_mac *)cmd; 2430 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2431 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2432 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2433 return cmd; 2434} 2435 2436static ipfw_insn * 2437add_mactype(ipfw_insn *cmd, char *av) 2438{ 2439 if (!av) 2440 errx(EX_DATAERR, "missing MAC type"); 2441 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2442 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2443 cmd->opcode = O_MAC_TYPE; 2444 return cmd; 2445 } else 2446 return NULL; 2447} 2448 2449static ipfw_insn * 2450add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2451{ 2452 struct protoent *pe; 2453 char *ep; 2454 int proto; 2455 2456 proto = strtol(av, &ep, 10); 2457 if (*ep != '\0' || proto <= 0) { 2458 if ((pe = getprotobyname(av)) == NULL) 2459 return NULL; 2460 proto = pe->p_proto; 2461 } 2462 2463 fill_cmd(cmd, O_PROTO, 0, proto); 2464 *protop = proto; 2465 return cmd; 2466} 2467 2468static ipfw_insn * 2469add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2470{ 2471 u_char proto = IPPROTO_IP; 2472 2473 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2474 ; /* do not set O_IP4 nor O_IP6 */ 2475 else if (strcmp(av, "ip4") == 0) 2476 /* explicit "just IPv4" rule */ 2477 fill_cmd(cmd, O_IP4, 0, 0); 2478 else if (strcmp(av, "ip6") == 0) { 2479 /* explicit "just IPv6" rule */ 2480 proto = IPPROTO_IPV6; 2481 fill_cmd(cmd, O_IP6, 0, 0); 2482 } else 2483 return add_proto0(cmd, av, protop); 2484 2485 *protop = proto; 2486 return cmd; 2487} 2488 2489static ipfw_insn * 2490add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2491{ 2492 u_char proto = IPPROTO_IP; 2493 2494 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2495 ; /* do not set O_IP4 nor O_IP6 */ 2496 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2497 /* explicit "just IPv4" rule */ 2498 fill_cmd(cmd, O_IP4, 0, 0); 2499 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2500 /* explicit "just IPv6" rule */ 2501 proto = IPPROTO_IPV6; 2502 fill_cmd(cmd, O_IP6, 0, 0); 2503 } else 2504 return add_proto0(cmd, av, protop); 2505 2506 *protop = proto; 2507 return cmd; 2508} 2509 2510static ipfw_insn * 2511add_srcip(ipfw_insn *cmd, char *av) 2512{ 2513 fill_ip((ipfw_insn_ip *)cmd, av); 2514 if (cmd->opcode == O_IP_DST_SET) /* set */ 2515 cmd->opcode = O_IP_SRC_SET; 2516 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2517 cmd->opcode = O_IP_SRC_LOOKUP; 2518 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2519 cmd->opcode = O_IP_SRC_ME; 2520 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2521 cmd->opcode = O_IP_SRC; 2522 else /* addr/mask */ 2523 cmd->opcode = O_IP_SRC_MASK; 2524 return cmd; 2525} 2526 2527static ipfw_insn * 2528add_dstip(ipfw_insn *cmd, char *av) 2529{ 2530 fill_ip((ipfw_insn_ip *)cmd, av); 2531 if (cmd->opcode == O_IP_DST_SET) /* set */ 2532 ; 2533 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2534 ; 2535 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2536 cmd->opcode = O_IP_DST_ME; 2537 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2538 cmd->opcode = O_IP_DST; 2539 else /* addr/mask */ 2540 cmd->opcode = O_IP_DST_MASK; 2541 return cmd; 2542} 2543 2544static ipfw_insn * 2545add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2546{ 2547 /* XXX "any" is trapped before. Perhaps "to" */ 2548 if (_substrcmp(av, "any") == 0) { 2549 return NULL; 2550 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2551 /* XXX todo: check that we have a protocol with ports */ 2552 cmd->opcode = opcode; 2553 return cmd; 2554 } 2555 return NULL; 2556} 2557 2558static ipfw_insn * 2559add_src(ipfw_insn *cmd, char *av, u_char proto) 2560{ 2561 struct in6_addr a; 2562 char *host, *ch; 2563 ipfw_insn *ret = NULL; 2564 2565 if ((host = strdup(av)) == NULL) 2566 return NULL; 2567 if ((ch = strrchr(host, '/')) != NULL) 2568 *ch = '\0'; 2569 2570 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2571 inet_pton(AF_INET6, host, &a) == 1) 2572 ret = add_srcip6(cmd, av); 2573 /* XXX: should check for IPv4, not !IPv6 */ 2574 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2575 inet_pton(AF_INET6, host, &a) != 1)) 2576 ret = add_srcip(cmd, av); 2577 if (ret == NULL && strcmp(av, "any") != 0) 2578 ret = cmd; 2579 2580 free(host); 2581 return ret; 2582} 2583 2584static ipfw_insn * 2585add_dst(ipfw_insn *cmd, char *av, u_char proto) 2586{ 2587 struct in6_addr a; 2588 char *host, *ch; 2589 ipfw_insn *ret = NULL; 2590 2591 if ((host = strdup(av)) == NULL) 2592 return NULL; 2593 if ((ch = strrchr(host, '/')) != NULL) 2594 *ch = '\0'; 2595 2596 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2597 inet_pton(AF_INET6, host, &a) == 1) 2598 ret = add_dstip6(cmd, av); 2599 /* XXX: should check for IPv4, not !IPv6 */ 2600 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2601 inet_pton(AF_INET6, host, &a) != 1)) 2602 ret = add_dstip(cmd, av); 2603 if (ret == NULL && strcmp(av, "any") != 0) 2604 ret = cmd; 2605 2606 free(host); 2607 return ret; 2608} 2609 2610/* 2611 * Parse arguments and assemble the microinstructions which make up a rule. 2612 * Rules are added into the 'rulebuf' and then copied in the correct order 2613 * into the actual rule. 2614 * 2615 * The syntax for a rule starts with the action, followed by 2616 * optional action parameters, and the various match patterns. 2617 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2618 * (generated if the rule includes a keep-state option), then the 2619 * various match patterns, log/altq actions, and the actual action. 2620 * 2621 */ 2622void 2623ipfw_add(char *av[]) 2624{ 2625 /* 2626 * rules are added into the 'rulebuf' and then copied in 2627 * the correct order into the actual rule. 2628 * Some things that need to go out of order (prob, action etc.) 2629 * go into actbuf[]. 2630 */ 2631 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2632 2633 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2634 ipfw_insn *first_cmd; /* first match pattern */ 2635 2636 struct ip_fw *rule; 2637 2638 /* 2639 * various flags used to record that we entered some fields. 2640 */ 2641 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2642 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2643 size_t len; 2644 2645 int i; 2646 2647 int open_par = 0; /* open parenthesis ( */ 2648 2649 /* proto is here because it is used to fetch ports */ 2650 u_char proto = IPPROTO_IP; /* default protocol */ 2651 2652 double match_prob = 1; /* match probability, default is always match */ 2653 2654 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2655 bzero(cmdbuf, sizeof(cmdbuf)); 2656 bzero(rulebuf, sizeof(rulebuf)); 2657 2658 rule = (struct ip_fw *)rulebuf; 2659 cmd = (ipfw_insn *)cmdbuf; 2660 action = (ipfw_insn *)actbuf; 2661 2662 av++; 2663 2664 /* [rule N] -- Rule number optional */ 2665 if (av[0] && isdigit(**av)) { 2666 rule->rulenum = atoi(*av); 2667 av++; 2668 } 2669 2670 /* [set N] -- set number (0..RESVD_SET), optional */ 2671 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 2672 int set = strtoul(av[1], NULL, 10); 2673 if (set < 0 || set > RESVD_SET) 2674 errx(EX_DATAERR, "illegal set %s", av[1]); 2675 rule->set = set; 2676 av += 2; 2677 } 2678 2679 /* [prob D] -- match probability, optional */ 2680 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 2681 match_prob = strtod(av[1], NULL); 2682 2683 if (match_prob <= 0 || match_prob > 1) 2684 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2685 av += 2; 2686 } 2687 2688 /* action -- mandatory */ 2689 NEED1("missing action"); 2690 i = match_token(rule_actions, *av); 2691 av++; 2692 action->len = 1; /* default */ 2693 switch(i) { 2694 case TOK_CHECKSTATE: 2695 have_state = action; 2696 action->opcode = O_CHECK_STATE; 2697 break; 2698 2699 case TOK_ACCEPT: 2700 action->opcode = O_ACCEPT; 2701 break; 2702 2703 case TOK_DENY: 2704 action->opcode = O_DENY; 2705 action->arg1 = 0; 2706 break; 2707 2708 case TOK_REJECT: 2709 action->opcode = O_REJECT; 2710 action->arg1 = ICMP_UNREACH_HOST; 2711 break; 2712 2713 case TOK_RESET: 2714 action->opcode = O_REJECT; 2715 action->arg1 = ICMP_REJECT_RST; 2716 break; 2717 2718 case TOK_RESET6: 2719 action->opcode = O_UNREACH6; 2720 action->arg1 = ICMP6_UNREACH_RST; 2721 break; 2722 2723 case TOK_UNREACH: 2724 action->opcode = O_REJECT; 2725 NEED1("missing reject code"); 2726 fill_reject_code(&action->arg1, *av); 2727 av++; 2728 break; 2729 2730 case TOK_UNREACH6: 2731 action->opcode = O_UNREACH6; 2732 NEED1("missing unreach code"); 2733 fill_unreach6_code(&action->arg1, *av); 2734 av++; 2735 break; 2736 2737 case TOK_COUNT: 2738 action->opcode = O_COUNT; 2739 break; 2740 2741 case TOK_NAT: 2742 action->opcode = O_NAT; 2743 action->len = F_INSN_SIZE(ipfw_insn_nat); 2744 goto chkarg; 2745 2746 case TOK_QUEUE: 2747 action->opcode = O_QUEUE; 2748 goto chkarg; 2749 case TOK_PIPE: 2750 action->opcode = O_PIPE; 2751 goto chkarg; 2752 case TOK_SKIPTO: 2753 action->opcode = O_SKIPTO; 2754 goto chkarg; 2755 case TOK_NETGRAPH: 2756 action->opcode = O_NETGRAPH; 2757 goto chkarg; 2758 case TOK_NGTEE: 2759 action->opcode = O_NGTEE; 2760 goto chkarg; 2761 case TOK_DIVERT: 2762 action->opcode = O_DIVERT; 2763 goto chkarg; 2764 case TOK_TEE: 2765 action->opcode = O_TEE; 2766chkarg: 2767 if (!av[0]) 2768 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2769 if (isdigit(**av)) { 2770 action->arg1 = strtoul(*av, NULL, 10); 2771 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2772 errx(EX_DATAERR, "illegal argument for %s", 2773 *(av - 1)); 2774 } else if (_substrcmp(*av, "tablearg") == 0) { 2775 action->arg1 = IP_FW_TABLEARG; 2776 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2777 struct servent *s; 2778 setservent(1); 2779 s = getservbyname(av[0], "divert"); 2780 if (s != NULL) 2781 action->arg1 = ntohs(s->s_port); 2782 else 2783 errx(EX_DATAERR, "illegal divert/tee port"); 2784 } else 2785 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2786 av++; 2787 break; 2788 2789 case TOK_FORWARD: { 2790 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2791 char *s, *end; 2792 2793 NEED1("missing forward address[:port]"); 2794 2795 action->opcode = O_FORWARD_IP; 2796 action->len = F_INSN_SIZE(ipfw_insn_sa); 2797 2798 /* 2799 * In the kernel we assume AF_INET and use only 2800 * sin_port and sin_addr. Remember to set sin_len as 2801 * the routing code seems to use it too. 2802 */ 2803 p->sa.sin_family = AF_INET; 2804 p->sa.sin_len = sizeof(struct sockaddr_in); 2805 p->sa.sin_port = 0; 2806 /* 2807 * locate the address-port separator (':' or ',') 2808 */ 2809 s = strchr(*av, ':'); 2810 if (s == NULL) 2811 s = strchr(*av, ','); 2812 if (s != NULL) { 2813 *(s++) = '\0'; 2814 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2815 if (s == end) 2816 errx(EX_DATAERR, 2817 "illegal forwarding port ``%s''", s); 2818 p->sa.sin_port = (u_short)i; 2819 } 2820 if (_substrcmp(*av, "tablearg") == 0) 2821 p->sa.sin_addr.s_addr = INADDR_ANY; 2822 else 2823 lookup_host(*av, &(p->sa.sin_addr)); 2824 av++; 2825 break; 2826 } 2827 case TOK_COMMENT: 2828 /* pretend it is a 'count' rule followed by the comment */ 2829 action->opcode = O_COUNT; 2830 av--; /* go back... */ 2831 break; 2832 2833 case TOK_SETFIB: 2834 { 2835 int numfibs; 2836 size_t intsize = sizeof(int); 2837 2838 action->opcode = O_SETFIB; 2839 NEED1("missing fib number"); 2840 action->arg1 = strtoul(*av, NULL, 10); 2841 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2842 errx(EX_DATAERR, "fibs not suported.\n"); 2843 if (action->arg1 >= numfibs) /* Temporary */ 2844 errx(EX_DATAERR, "fib too large.\n"); 2845 av++; 2846 break; 2847 } 2848 2849 case TOK_REASS: 2850 action->opcode = O_REASS; 2851 break; 2852 2853 default: 2854 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2855 } 2856 action = next_cmd(action); 2857 2858 /* 2859 * [altq queuename] -- altq tag, optional 2860 * [log [logamount N]] -- log, optional 2861 * 2862 * If they exist, it go first in the cmdbuf, but then it is 2863 * skipped in the copy section to the end of the buffer. 2864 */ 2865 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 2866 av++; 2867 switch (i) { 2868 case TOK_LOG: 2869 { 2870 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2871 int l; 2872 2873 if (have_log) 2874 errx(EX_DATAERR, 2875 "log cannot be specified more than once"); 2876 have_log = (ipfw_insn *)c; 2877 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2878 cmd->opcode = O_LOG; 2879 if (av[0] && _substrcmp(*av, "logamount") == 0) { 2880 av++; 2881 NEED1("logamount requires argument"); 2882 l = atoi(*av); 2883 if (l < 0) 2884 errx(EX_DATAERR, 2885 "logamount must be positive"); 2886 c->max_log = l; 2887 av++; 2888 } else { 2889 len = sizeof(c->max_log); 2890 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2891 &c->max_log, &len, NULL, 0) == -1) 2892 errx(1, "sysctlbyname(\"%s\")", 2893 "net.inet.ip.fw.verbose_limit"); 2894 } 2895 } 2896 break; 2897 2898#ifndef NO_ALTQ 2899 case TOK_ALTQ: 2900 { 2901 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2902 2903 NEED1("missing altq queue name"); 2904 if (have_altq) 2905 errx(EX_DATAERR, 2906 "altq cannot be specified more than once"); 2907 have_altq = (ipfw_insn *)a; 2908 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2909 cmd->opcode = O_ALTQ; 2910 a->qid = altq_name_to_qid(*av); 2911 av++; 2912 } 2913 break; 2914#endif 2915 2916 case TOK_TAG: 2917 case TOK_UNTAG: { 2918 uint16_t tag; 2919 2920 if (have_tag) 2921 errx(EX_USAGE, "tag and untag cannot be " 2922 "specified more than once"); 2923 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 2924 rule_action_params); 2925 have_tag = cmd; 2926 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2927 av++; 2928 break; 2929 } 2930 2931 default: 2932 abort(); 2933 } 2934 cmd = next_cmd(cmd); 2935 } 2936 2937 if (have_state) /* must be a check-state, we are done */ 2938 goto done; 2939 2940#define OR_START(target) \ 2941 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 2942 if (open_par) \ 2943 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2944 prev = NULL; \ 2945 open_par = 1; \ 2946 if ( (av[0])[1] == '\0') { \ 2947 av++; \ 2948 } else \ 2949 (*av)++; \ 2950 } \ 2951 target: \ 2952 2953 2954#define CLOSE_PAR \ 2955 if (open_par) { \ 2956 if (av[0] && ( \ 2957 strcmp(*av, ")") == 0 || \ 2958 strcmp(*av, "}") == 0)) { \ 2959 prev = NULL; \ 2960 open_par = 0; \ 2961 av++; \ 2962 } else \ 2963 errx(EX_USAGE, "missing \")\"\n"); \ 2964 } 2965 2966#define NOT_BLOCK \ 2967 if (av[0] && _substrcmp(*av, "not") == 0) { \ 2968 if (cmd->len & F_NOT) \ 2969 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2970 cmd->len |= F_NOT; \ 2971 av++; \ 2972 } 2973 2974#define OR_BLOCK(target) \ 2975 if (av[0] && _substrcmp(*av, "or") == 0) { \ 2976 if (prev == NULL || open_par == 0) \ 2977 errx(EX_DATAERR, "invalid OR block"); \ 2978 prev->len |= F_OR; \ 2979 av++; \ 2980 goto target; \ 2981 } \ 2982 CLOSE_PAR; 2983 2984 first_cmd = cmd; 2985 2986#if 0 2987 /* 2988 * MAC addresses, optional. 2989 * If we have this, we skip the part "proto from src to dst" 2990 * and jump straight to the option parsing. 2991 */ 2992 NOT_BLOCK; 2993 NEED1("missing protocol"); 2994 if (_substrcmp(*av, "MAC") == 0 || 2995 _substrcmp(*av, "mac") == 0) { 2996 av++; /* the "MAC" keyword */ 2997 add_mac(cmd, av); /* exits in case of errors */ 2998 cmd = next_cmd(cmd); 2999 av += 2; /* dst-mac and src-mac */ 3000 NOT_BLOCK; 3001 NEED1("missing mac type"); 3002 if (add_mactype(cmd, av[0])) 3003 cmd = next_cmd(cmd); 3004 av++; /* any or mac-type */ 3005 goto read_options; 3006 } 3007#endif 3008 3009 /* 3010 * protocol, mandatory 3011 */ 3012 OR_START(get_proto); 3013 NOT_BLOCK; 3014 NEED1("missing protocol"); 3015 if (add_proto_compat(cmd, *av, &proto)) { 3016 av++; 3017 if (F_LEN(cmd) != 0) { 3018 prev = cmd; 3019 cmd = next_cmd(cmd); 3020 } 3021 } else if (first_cmd != cmd) { 3022 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3023 } else 3024 goto read_options; 3025 OR_BLOCK(get_proto); 3026 3027 /* 3028 * "from", mandatory 3029 */ 3030 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3031 errx(EX_USAGE, "missing ``from''"); 3032 av++; 3033 3034 /* 3035 * source IP, mandatory 3036 */ 3037 OR_START(source_ip); 3038 NOT_BLOCK; /* optional "not" */ 3039 NEED1("missing source address"); 3040 if (add_src(cmd, *av, proto)) { 3041 av++; 3042 if (F_LEN(cmd) != 0) { /* ! any */ 3043 prev = cmd; 3044 cmd = next_cmd(cmd); 3045 } 3046 } else 3047 errx(EX_USAGE, "bad source address %s", *av); 3048 OR_BLOCK(source_ip); 3049 3050 /* 3051 * source ports, optional 3052 */ 3053 NOT_BLOCK; /* optional "not" */ 3054 if ( av[0] != NULL ) { 3055 if (_substrcmp(*av, "any") == 0 || 3056 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3057 av++; 3058 if (F_LEN(cmd) != 0) 3059 cmd = next_cmd(cmd); 3060 } 3061 } 3062 3063 /* 3064 * "to", mandatory 3065 */ 3066 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 3067 errx(EX_USAGE, "missing ``to''"); 3068 av++; 3069 3070 /* 3071 * destination, mandatory 3072 */ 3073 OR_START(dest_ip); 3074 NOT_BLOCK; /* optional "not" */ 3075 NEED1("missing dst address"); 3076 if (add_dst(cmd, *av, proto)) { 3077 av++; 3078 if (F_LEN(cmd) != 0) { /* ! any */ 3079 prev = cmd; 3080 cmd = next_cmd(cmd); 3081 } 3082 } else 3083 errx( EX_USAGE, "bad destination address %s", *av); 3084 OR_BLOCK(dest_ip); 3085 3086 /* 3087 * dest. ports, optional 3088 */ 3089 NOT_BLOCK; /* optional "not" */ 3090 if (av[0]) { 3091 if (_substrcmp(*av, "any") == 0 || 3092 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3093 av++; 3094 if (F_LEN(cmd) != 0) 3095 cmd = next_cmd(cmd); 3096 } 3097 } 3098 3099read_options: 3100 if (av[0] && first_cmd == cmd) { 3101 /* 3102 * nothing specified so far, store in the rule to ease 3103 * printout later. 3104 */ 3105 rule->_pad = 1; 3106 } 3107 prev = NULL; 3108 while ( av[0] != NULL ) { 3109 char *s; 3110 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3111 3112 s = *av; 3113 cmd32 = (ipfw_insn_u32 *)cmd; 3114 3115 if (*s == '!') { /* alternate syntax for NOT */ 3116 if (cmd->len & F_NOT) 3117 errx(EX_USAGE, "double \"not\" not allowed\n"); 3118 cmd->len = F_NOT; 3119 s++; 3120 } 3121 i = match_token(rule_options, s); 3122 av++; 3123 switch(i) { 3124 case TOK_NOT: 3125 if (cmd->len & F_NOT) 3126 errx(EX_USAGE, "double \"not\" not allowed\n"); 3127 cmd->len = F_NOT; 3128 break; 3129 3130 case TOK_OR: 3131 if (open_par == 0 || prev == NULL) 3132 errx(EX_USAGE, "invalid \"or\" block\n"); 3133 prev->len |= F_OR; 3134 break; 3135 3136 case TOK_STARTBRACE: 3137 if (open_par) 3138 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3139 open_par = 1; 3140 break; 3141 3142 case TOK_ENDBRACE: 3143 if (!open_par) 3144 errx(EX_USAGE, "+missing \")\"\n"); 3145 open_par = 0; 3146 prev = NULL; 3147 break; 3148 3149 case TOK_IN: 3150 fill_cmd(cmd, O_IN, 0, 0); 3151 break; 3152 3153 case TOK_OUT: 3154 cmd->len ^= F_NOT; /* toggle F_NOT */ 3155 fill_cmd(cmd, O_IN, 0, 0); 3156 break; 3157 3158 case TOK_DIVERTED: 3159 fill_cmd(cmd, O_DIVERTED, 0, 3); 3160 break; 3161 3162 case TOK_DIVERTEDLOOPBACK: 3163 fill_cmd(cmd, O_DIVERTED, 0, 1); 3164 break; 3165 3166 case TOK_DIVERTEDOUTPUT: 3167 fill_cmd(cmd, O_DIVERTED, 0, 2); 3168 break; 3169 3170 case TOK_FRAG: 3171 fill_cmd(cmd, O_FRAG, 0, 0); 3172 break; 3173 3174 case TOK_LAYER2: 3175 fill_cmd(cmd, O_LAYER2, 0, 0); 3176 break; 3177 3178 case TOK_XMIT: 3179 case TOK_RECV: 3180 case TOK_VIA: 3181 NEED1("recv, xmit, via require interface name" 3182 " or address"); 3183 fill_iface((ipfw_insn_if *)cmd, av[0]); 3184 av++; 3185 if (F_LEN(cmd) == 0) /* not a valid address */ 3186 break; 3187 if (i == TOK_XMIT) 3188 cmd->opcode = O_XMIT; 3189 else if (i == TOK_RECV) 3190 cmd->opcode = O_RECV; 3191 else if (i == TOK_VIA) 3192 cmd->opcode = O_VIA; 3193 break; 3194 3195 case TOK_ICMPTYPES: 3196 NEED1("icmptypes requires list of types"); 3197 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3198 av++; 3199 break; 3200 3201 case TOK_ICMP6TYPES: 3202 NEED1("icmptypes requires list of types"); 3203 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3204 av++; 3205 break; 3206 3207 case TOK_IPTTL: 3208 NEED1("ipttl requires TTL"); 3209 if (strpbrk(*av, "-,")) { 3210 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3211 errx(EX_DATAERR, "invalid ipttl %s", *av); 3212 } else 3213 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3214 av++; 3215 break; 3216 3217 case TOK_IPID: 3218 NEED1("ipid requires id"); 3219 if (strpbrk(*av, "-,")) { 3220 if (!add_ports(cmd, *av, 0, O_IPID)) 3221 errx(EX_DATAERR, "invalid ipid %s", *av); 3222 } else 3223 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3224 av++; 3225 break; 3226 3227 case TOK_IPLEN: 3228 NEED1("iplen requires length"); 3229 if (strpbrk(*av, "-,")) { 3230 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3231 errx(EX_DATAERR, "invalid ip len %s", *av); 3232 } else 3233 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3234 av++; 3235 break; 3236 3237 case TOK_IPVER: 3238 NEED1("ipver requires version"); 3239 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3240 av++; 3241 break; 3242 3243 case TOK_IPPRECEDENCE: 3244 NEED1("ipprecedence requires value"); 3245 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3246 (strtoul(*av, NULL, 0) & 7) << 5); 3247 av++; 3248 break; 3249 3250 case TOK_IPOPTS: 3251 NEED1("missing argument for ipoptions"); 3252 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3253 av++; 3254 break; 3255 3256 case TOK_IPTOS: 3257 NEED1("missing argument for iptos"); 3258 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3259 av++; 3260 break; 3261 3262 case TOK_UID: 3263 NEED1("uid requires argument"); 3264 { 3265 char *end; 3266 uid_t uid; 3267 struct passwd *pwd; 3268 3269 cmd->opcode = O_UID; 3270 uid = strtoul(*av, &end, 0); 3271 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3272 if (pwd == NULL) 3273 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3274 cmd32->d[0] = pwd->pw_uid; 3275 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3276 av++; 3277 } 3278 break; 3279 3280 case TOK_GID: 3281 NEED1("gid requires argument"); 3282 { 3283 char *end; 3284 gid_t gid; 3285 struct group *grp; 3286 3287 cmd->opcode = O_GID; 3288 gid = strtoul(*av, &end, 0); 3289 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3290 if (grp == NULL) 3291 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3292 cmd32->d[0] = grp->gr_gid; 3293 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3294 av++; 3295 } 3296 break; 3297 3298 case TOK_JAIL: 3299 NEED1("jail requires argument"); 3300 { 3301 char *end; 3302 int jid; 3303 3304 cmd->opcode = O_JAIL; 3305 jid = (int)strtol(*av, &end, 0); 3306 if (jid < 0 || *end != '\0') 3307 errx(EX_DATAERR, "jail requires prison ID"); 3308 cmd32->d[0] = (uint32_t)jid; 3309 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3310 av++; 3311 } 3312 break; 3313 3314 case TOK_ESTAB: 3315 fill_cmd(cmd, O_ESTAB, 0, 0); 3316 break; 3317 3318 case TOK_SETUP: 3319 fill_cmd(cmd, O_TCPFLAGS, 0, 3320 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3321 break; 3322 3323 case TOK_TCPDATALEN: 3324 NEED1("tcpdatalen requires length"); 3325 if (strpbrk(*av, "-,")) { 3326 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3327 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3328 } else 3329 fill_cmd(cmd, O_TCPDATALEN, 0, 3330 strtoul(*av, NULL, 0)); 3331 av++; 3332 break; 3333 3334 case TOK_TCPOPTS: 3335 NEED1("missing argument for tcpoptions"); 3336 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3337 av++; 3338 break; 3339 3340 case TOK_TCPSEQ: 3341 case TOK_TCPACK: 3342 NEED1("tcpseq/tcpack requires argument"); 3343 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3344 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3345 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3346 av++; 3347 break; 3348 3349 case TOK_TCPWIN: 3350 NEED1("tcpwin requires length"); 3351 fill_cmd(cmd, O_TCPWIN, 0, 3352 htons(strtoul(*av, NULL, 0))); 3353 av++; 3354 break; 3355 3356 case TOK_TCPFLAGS: 3357 NEED1("missing argument for tcpflags"); 3358 cmd->opcode = O_TCPFLAGS; 3359 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3360 av++; 3361 break; 3362 3363 case TOK_KEEPSTATE: 3364 if (open_par) 3365 errx(EX_USAGE, "keep-state cannot be part " 3366 "of an or block"); 3367 if (have_state) 3368 errx(EX_USAGE, "only one of keep-state " 3369 "and limit is allowed"); 3370 have_state = cmd; 3371 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3372 break; 3373 3374 case TOK_LIMIT: { 3375 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3376 int val; 3377 3378 if (open_par) 3379 errx(EX_USAGE, 3380 "limit cannot be part of an or block"); 3381 if (have_state) 3382 errx(EX_USAGE, "only one of keep-state and " 3383 "limit is allowed"); 3384 have_state = cmd; 3385 3386 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3387 cmd->opcode = O_LIMIT; 3388 c->limit_mask = c->conn_limit = 0; 3389 3390 while ( av[0] != NULL ) { 3391 if ((val = match_token(limit_masks, *av)) <= 0) 3392 break; 3393 c->limit_mask |= val; 3394 av++; 3395 } 3396 3397 if (c->limit_mask == 0) 3398 errx(EX_USAGE, "limit: missing limit mask"); 3399 3400 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3401 TOK_LIMIT, rule_options); 3402 3403 av++; 3404 break; 3405 } 3406 3407 case TOK_PROTO: 3408 NEED1("missing protocol"); 3409 if (add_proto(cmd, *av, &proto)) { 3410 av++; 3411 } else 3412 errx(EX_DATAERR, "invalid protocol ``%s''", 3413 *av); 3414 break; 3415 3416 case TOK_SRCIP: 3417 NEED1("missing source IP"); 3418 if (add_srcip(cmd, *av)) { 3419 av++; 3420 } 3421 break; 3422 3423 case TOK_DSTIP: 3424 NEED1("missing destination IP"); 3425 if (add_dstip(cmd, *av)) { 3426 av++; 3427 } 3428 break; 3429 3430 case TOK_SRCIP6: 3431 NEED1("missing source IP6"); 3432 if (add_srcip6(cmd, *av)) { 3433 av++; 3434 } 3435 break; 3436 3437 case TOK_DSTIP6: 3438 NEED1("missing destination IP6"); 3439 if (add_dstip6(cmd, *av)) { 3440 av++; 3441 } 3442 break; 3443 3444 case TOK_SRCPORT: 3445 NEED1("missing source port"); 3446 if (_substrcmp(*av, "any") == 0 || 3447 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3448 av++; 3449 } else 3450 errx(EX_DATAERR, "invalid source port %s", *av); 3451 break; 3452 3453 case TOK_DSTPORT: 3454 NEED1("missing destination port"); 3455 if (_substrcmp(*av, "any") == 0 || 3456 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3457 av++; 3458 } else 3459 errx(EX_DATAERR, "invalid destination port %s", 3460 *av); 3461 break; 3462 3463 case TOK_MAC: 3464 if (add_mac(cmd, av)) 3465 av += 2; 3466 break; 3467 3468 case TOK_MACTYPE: 3469 NEED1("missing mac type"); 3470 if (!add_mactype(cmd, *av)) 3471 errx(EX_DATAERR, "invalid mac type %s", *av); 3472 av++; 3473 break; 3474 3475 case TOK_VERREVPATH: 3476 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3477 break; 3478 3479 case TOK_VERSRCREACH: 3480 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3481 break; 3482 3483 case TOK_ANTISPOOF: 3484 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3485 break; 3486 3487 case TOK_IPSEC: 3488 fill_cmd(cmd, O_IPSEC, 0, 0); 3489 break; 3490 3491 case TOK_IPV6: 3492 fill_cmd(cmd, O_IP6, 0, 0); 3493 break; 3494 3495 case TOK_IPV4: 3496 fill_cmd(cmd, O_IP4, 0, 0); 3497 break; 3498 3499 case TOK_EXT6HDR: 3500 fill_ext6hdr( cmd, *av ); 3501 av++; 3502 break; 3503 3504 case TOK_FLOWID: 3505 if (proto != IPPROTO_IPV6 ) 3506 errx( EX_USAGE, "flow-id filter is active " 3507 "only for ipv6 protocol\n"); 3508 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3509 av++; 3510 break; 3511 3512 case TOK_COMMENT: 3513 fill_comment(cmd, av); 3514 av[0]=NULL; 3515 break; 3516 3517 case TOK_TAGGED: 3518 if (av[0] && strpbrk(*av, "-,")) { 3519 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3520 errx(EX_DATAERR, "tagged: invalid tag" 3521 " list: %s", *av); 3522 } 3523 else { 3524 uint16_t tag; 3525 3526 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3527 TOK_TAGGED, rule_options); 3528 fill_cmd(cmd, O_TAGGED, 0, tag); 3529 } 3530 av++; 3531 break; 3532 3533 case TOK_FIB: 3534 NEED1("fib requires fib number"); 3535 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3536 av++; 3537 break; 3538 case TOK_SOCKARG: 3539 fill_cmd(cmd, O_SOCKARG, 0, 0); 3540 break; 3541 3542 case TOK_LOOKUP: { 3543 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 3544 char *p; 3545 int j; 3546 3547 if (!av[0] || !av[1]) 3548 errx(EX_USAGE, "format: lookup argument tablenum"); 3549 cmd->opcode = O_IP_DST_LOOKUP; 3550 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 3551 i = match_token(rule_options, *av); 3552 for (j = 0; lookup_key[j] >= 0 ; j++) { 3553 if (i == lookup_key[j]) 3554 break; 3555 } 3556 if (lookup_key[j] <= 0) 3557 errx(EX_USAGE, "format: cannot lookup on %s", *av); 3558 c->d[1] = j; // i converted to option 3559 av++; 3560 cmd->arg1 = strtoul(*av, &p, 0); 3561 if (p && *p) 3562 errx(EX_USAGE, "format: lookup argument tablenum"); 3563 av++; 3564 } 3565 break; 3566 3567 default: 3568 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3569 } 3570 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3571 prev = cmd; 3572 cmd = next_cmd(cmd); 3573 } 3574 } 3575 3576done: 3577 /* 3578 * Now copy stuff into the rule. 3579 * If we have a keep-state option, the first instruction 3580 * must be a PROBE_STATE (which is generated here). 3581 * If we have a LOG option, it was stored as the first command, 3582 * and now must be moved to the top of the action part. 3583 */ 3584 dst = (ipfw_insn *)rule->cmd; 3585 3586 /* 3587 * First thing to write into the command stream is the match probability. 3588 */ 3589 if (match_prob != 1) { /* 1 means always match */ 3590 dst->opcode = O_PROB; 3591 dst->len = 2; 3592 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3593 dst += dst->len; 3594 } 3595 3596 /* 3597 * generate O_PROBE_STATE if necessary 3598 */ 3599 if (have_state && have_state->opcode != O_CHECK_STATE) { 3600 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3601 dst = next_cmd(dst); 3602 } 3603 3604 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3605 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3606 i = F_LEN(src); 3607 3608 switch (src->opcode) { 3609 case O_LOG: 3610 case O_KEEP_STATE: 3611 case O_LIMIT: 3612 case O_ALTQ: 3613 case O_TAG: 3614 break; 3615 default: 3616 bcopy(src, dst, i * sizeof(uint32_t)); 3617 dst += i; 3618 } 3619 } 3620 3621 /* 3622 * put back the have_state command as last opcode 3623 */ 3624 if (have_state && have_state->opcode != O_CHECK_STATE) { 3625 i = F_LEN(have_state); 3626 bcopy(have_state, dst, i * sizeof(uint32_t)); 3627 dst += i; 3628 } 3629 /* 3630 * start action section 3631 */ 3632 rule->act_ofs = dst - rule->cmd; 3633 3634 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3635 if (have_log) { 3636 i = F_LEN(have_log); 3637 bcopy(have_log, dst, i * sizeof(uint32_t)); 3638 dst += i; 3639 } 3640 if (have_altq) { 3641 i = F_LEN(have_altq); 3642 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3643 dst += i; 3644 } 3645 if (have_tag) { 3646 i = F_LEN(have_tag); 3647 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3648 dst += i; 3649 } 3650 /* 3651 * copy all other actions 3652 */ 3653 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3654 i = F_LEN(src); 3655 bcopy(src, dst, i * sizeof(uint32_t)); 3656 dst += i; 3657 } 3658 3659 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3660 i = (char *)dst - (char *)rule; 3661 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3662 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3663 if (!co.do_quiet) 3664 show_ipfw(rule, 0, 0); 3665} 3666 3667/* 3668 * clear the counters or the log counters. 3669 */ 3670void 3671ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3672{ 3673 uint32_t arg, saved_arg; 3674 int failed = EX_OK; 3675 char const *errstr; 3676 char const *name = optname ? "RESETLOG" : "ZERO"; 3677 3678 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3679 3680 av++; ac--; 3681 3682 if (!ac) { 3683 /* clear all entries */ 3684 if (do_cmd(optname, NULL, 0) < 0) 3685 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3686 if (!co.do_quiet) 3687 printf("%s.\n", optname == IP_FW_ZERO ? 3688 "Accounting cleared":"Logging counts reset"); 3689 3690 return; 3691 } 3692 3693 while (ac) { 3694 /* Rule number */ 3695 if (isdigit(**av)) { 3696 arg = strtonum(*av, 0, 0xffff, &errstr); 3697 if (errstr) 3698 errx(EX_DATAERR, 3699 "invalid rule number %s\n", *av); 3700 saved_arg = arg; 3701 if (co.use_set) 3702 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3703 av++; 3704 ac--; 3705 if (do_cmd(optname, &arg, sizeof(arg))) { 3706 warn("rule %u: setsockopt(IP_FW_%s)", 3707 saved_arg, name); 3708 failed = EX_UNAVAILABLE; 3709 } else if (!co.do_quiet) 3710 printf("Entry %d %s.\n", saved_arg, 3711 optname == IP_FW_ZERO ? 3712 "cleared" : "logging count reset"); 3713 } else { 3714 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3715 } 3716 } 3717 if (failed != EX_OK) 3718 exit(failed); 3719} 3720 3721void 3722ipfw_flush(int force) 3723{ 3724 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3725 3726 if (!force && !co.do_quiet) { /* need to ask user */ 3727 int c; 3728 3729 printf("Are you sure? [yn] "); 3730 fflush(stdout); 3731 do { 3732 c = toupper(getc(stdin)); 3733 while (c != '\n' && getc(stdin) != '\n') 3734 if (feof(stdin)) 3735 return; /* and do not flush */ 3736 } while (c != 'Y' && c != 'N'); 3737 printf("\n"); 3738 if (c == 'N') /* user said no */ 3739 return; 3740 } 3741 if (co.do_pipe) { 3742 dummynet_flush(); 3743 return; 3744 } 3745 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3746 if (co.use_set) { 3747 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3748 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3749 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3750 } else if (do_cmd(cmd, NULL, 0) < 0) 3751 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3752 co.do_pipe ? "DUMMYNET" : "FW"); 3753 if (!co.do_quiet) 3754 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3755} 3756 3757 3758static void table_list(ipfw_table_entry ent, int need_header); 3759 3760/* 3761 * This one handles all table-related commands 3762 * ipfw table N add addr[/masklen] [value] 3763 * ipfw table N delete addr[/masklen] 3764 * ipfw table {N | all} flush 3765 * ipfw table {N | all} list 3766 */ 3767void 3768ipfw_table_handler(int ac, char *av[]) 3769{ 3770 ipfw_table_entry ent; 3771 int do_add; 3772 int is_all; 3773 size_t len; 3774 char *p; 3775 uint32_t a; 3776 uint32_t tables_max; 3777 3778 len = sizeof(tables_max); 3779 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3780 NULL, 0) == -1) { 3781#ifdef IPFW_TABLES_MAX 3782 warn("Warn: Failed to get the max tables number via sysctl. " 3783 "Using the compiled in defaults. \nThe reason was"); 3784 tables_max = IPFW_TABLES_MAX; 3785#else 3786 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3787#endif 3788 } 3789 3790 ac--; av++; 3791 if (ac && isdigit(**av)) { 3792 ent.tbl = atoi(*av); 3793 is_all = 0; 3794 ac--; av++; 3795 } else if (ac && _substrcmp(*av, "all") == 0) { 3796 ent.tbl = 0; 3797 is_all = 1; 3798 ac--; av++; 3799 } else 3800 errx(EX_USAGE, "table number or 'all' keyword required"); 3801 if (ent.tbl >= tables_max) 3802 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3803 "value (%d)", tables_max - 1); 3804 NEED1("table needs command"); 3805 if (is_all && _substrcmp(*av, "list") != 0 3806 && _substrcmp(*av, "flush") != 0) 3807 errx(EX_USAGE, "table number required"); 3808 3809 if (_substrcmp(*av, "add") == 0 || 3810 _substrcmp(*av, "delete") == 0) { 3811 do_add = **av == 'a'; 3812 ac--; av++; 3813 if (!ac) 3814 errx(EX_USAGE, "IP address required"); 3815 p = strchr(*av, '/'); 3816 if (p) { 3817 *p++ = '\0'; 3818 ent.masklen = atoi(p); 3819 if (ent.masklen > 32) 3820 errx(EX_DATAERR, "bad width ``%s''", p); 3821 } else 3822 ent.masklen = 32; 3823 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3824 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3825 ac--; av++; 3826 if (do_add && ac) { 3827 unsigned int tval; 3828 /* isdigit is a bit of a hack here.. */ 3829 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3830 ent.value = strtoul(*av, NULL, 0); 3831 } else { 3832 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3833 /* The value must be stored in host order * 3834 * so that the values < 65k can be distinguished */ 3835 ent.value = ntohl(tval); 3836 } else { 3837 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3838 } 3839 } 3840 } else 3841 ent.value = 0; 3842 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3843 &ent, sizeof(ent)) < 0) { 3844 /* If running silent, don't bomb out on these errors. */ 3845 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3846 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3847 do_add ? "ADD" : "DEL"); 3848 /* In silent mode, react to a failed add by deleting */ 3849 if (do_add) { 3850 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3851 if (do_cmd(IP_FW_TABLE_ADD, 3852 &ent, sizeof(ent)) < 0) 3853 err(EX_OSERR, 3854 "setsockopt(IP_FW_TABLE_ADD)"); 3855 } 3856 } 3857 } else if (_substrcmp(*av, "flush") == 0) { 3858 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3859 do { 3860 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3861 sizeof(ent.tbl)) < 0) 3862 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3863 } while (++ent.tbl < a); 3864 } else if (_substrcmp(*av, "list") == 0) { 3865 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3866 do { 3867 table_list(ent, is_all); 3868 } while (++ent.tbl < a); 3869 } else 3870 errx(EX_USAGE, "invalid table command %s", *av); 3871} 3872 3873static void 3874table_list(ipfw_table_entry ent, int need_header) 3875{ 3876 ipfw_table *tbl; 3877 socklen_t l; 3878 uint32_t a; 3879 3880 a = ent.tbl; 3881 l = sizeof(a); 3882 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3883 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3884 3885 /* If a is zero we have nothing to do, the table is empty. */ 3886 if (a == 0) 3887 return; 3888 3889 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3890 tbl = safe_calloc(1, l); 3891 tbl->tbl = ent.tbl; 3892 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3893 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3894 if (tbl->cnt && need_header) 3895 printf("---table(%d)---\n", tbl->tbl); 3896 for (a = 0; a < tbl->cnt; a++) { 3897 unsigned int tval; 3898 tval = tbl->ent[a].value; 3899 if (co.do_value_as_ip) { 3900 char tbuf[128]; 3901 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3902 &tbl->ent[a].addr), 127); 3903 /* inet_ntoa expects network order */ 3904 tval = htonl(tval); 3905 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3906 inet_ntoa(*(struct in_addr *)&tval)); 3907 } else { 3908 printf("%s/%u %u\n", 3909 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3910 tbl->ent[a].masklen, tval); 3911 } 3912 } 3913 free(tbl); 3914} 3915