ipfw2.c revision 205169
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 205169 2010-03-15 15:43:35Z 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 { "tcpdatalen", TOK_TCPDATALEN }, 270 { "tcpflags", TOK_TCPFLAGS }, 271 { "tcpflgs", TOK_TCPFLAGS }, 272 { "tcpoptions", TOK_TCPOPTS }, 273 { "tcpopts", TOK_TCPOPTS }, 274 { "tcpseq", TOK_TCPSEQ }, 275 { "tcpack", TOK_TCPACK }, 276 { "tcpwin", TOK_TCPWIN }, 277 { "icmptype", TOK_ICMPTYPES }, 278 { "icmptypes", TOK_ICMPTYPES }, 279 { "dst-ip", TOK_DSTIP }, 280 { "src-ip", TOK_SRCIP }, 281 { "dst-port", TOK_DSTPORT }, 282 { "src-port", TOK_SRCPORT }, 283 { "proto", TOK_PROTO }, 284 { "MAC", TOK_MAC }, 285 { "mac", TOK_MAC }, 286 { "mac-type", TOK_MACTYPE }, 287 { "verrevpath", TOK_VERREVPATH }, 288 { "versrcreach", TOK_VERSRCREACH }, 289 { "antispoof", TOK_ANTISPOOF }, 290 { "ipsec", TOK_IPSEC }, 291 { "icmp6type", TOK_ICMP6TYPES }, 292 { "icmp6types", TOK_ICMP6TYPES }, 293 { "ext6hdr", TOK_EXT6HDR}, 294 { "flow-id", TOK_FLOWID}, 295 { "ipv6", TOK_IPV6}, 296 { "ip6", TOK_IPV6}, 297 { "ipv4", TOK_IPV4}, 298 { "ip4", TOK_IPV4}, 299 { "dst-ipv6", TOK_DSTIP6}, 300 { "dst-ip6", TOK_DSTIP6}, 301 { "src-ipv6", TOK_SRCIP6}, 302 { "src-ip6", TOK_SRCIP6}, 303 { "lookup", TOK_LOOKUP}, 304 { "//", TOK_COMMENT }, 305 306 { "not", TOK_NOT }, /* pseudo option */ 307 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 308 { "or", TOK_OR }, /* pseudo option */ 309 { "|", /* escape */ TOK_OR }, /* pseudo option */ 310 { "{", TOK_STARTBRACE }, /* pseudo option */ 311 { "(", TOK_STARTBRACE }, /* pseudo option */ 312 { "}", TOK_ENDBRACE }, /* pseudo option */ 313 { ")", TOK_ENDBRACE }, /* pseudo option */ 314 { NULL, 0 } /* terminator */ 315}; 316 317/* 318 * The following is used to generate a printable argument for 319 * 64-bit numbers, irrespective of platform alignment and bit size. 320 * Because all the printf in this program use %llu as a format, 321 * we just return an unsigned long long, which is larger than 322 * we need in certain cases, but saves the hassle of using 323 * PRIu64 as a format specifier. 324 * We don't care about inlining, this is not performance critical code. 325 */ 326unsigned long long 327align_uint64(const uint64_t *pll) 328{ 329 uint64_t ret; 330 331 bcopy (pll, &ret, sizeof(ret)); 332 return ret; 333} 334 335void * 336safe_calloc(size_t number, size_t size) 337{ 338 void *ret = calloc(number, size); 339 340 if (ret == NULL) 341 err(EX_OSERR, "calloc"); 342 return ret; 343} 344 345void * 346safe_realloc(void *ptr, size_t size) 347{ 348 void *ret = realloc(ptr, size); 349 350 if (ret == NULL) 351 err(EX_OSERR, "realloc"); 352 return ret; 353} 354 355/* 356 * conditionally runs the command. 357 * Selected options or negative -> getsockopt 358 */ 359int 360do_cmd(int optname, void *optval, uintptr_t optlen) 361{ 362 static int s = -1; /* the socket */ 363 int i; 364 365 if (co.test_only) 366 return 0; 367 368 if (s == -1) 369 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 370 if (s < 0) 371 err(EX_UNAVAILABLE, "socket"); 372 373 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 374 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 375 optname == IP_FW_TABLE_GETSIZE || 376 optname == IP_FW_NAT_GET_CONFIG || 377 optname < 0 || 378 optname == IP_FW_NAT_GET_LOG) { 379 if (optname < 0) 380 optname = -optname; 381 i = getsockopt(s, IPPROTO_IP, optname, optval, 382 (socklen_t *)optlen); 383 } else { 384 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 385 } 386 return i; 387} 388 389/** 390 * match_token takes a table and a string, returns the value associated 391 * with the string (-1 in case of failure). 392 */ 393int 394match_token(struct _s_x *table, char *string) 395{ 396 struct _s_x *pt; 397 uint i = strlen(string); 398 399 for (pt = table ; i && pt->s != NULL ; pt++) 400 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 401 return pt->x; 402 return -1; 403} 404 405/** 406 * match_value takes a table and a value, returns the string associated 407 * with the value (NULL in case of failure). 408 */ 409char const * 410match_value(struct _s_x *p, int value) 411{ 412 for (; p->s != NULL; p++) 413 if (p->x == value) 414 return p->s; 415 return NULL; 416} 417 418/* 419 * _substrcmp takes two strings and returns 1 if they do not match, 420 * and 0 if they match exactly or the first string is a sub-string 421 * of the second. A warning is printed to stderr in the case that the 422 * first string is a sub-string of the second. 423 * 424 * This function will be removed in the future through the usual 425 * deprecation process. 426 */ 427int 428_substrcmp(const char *str1, const char* str2) 429{ 430 431 if (strncmp(str1, str2, strlen(str1)) != 0) 432 return 1; 433 434 if (strlen(str1) != strlen(str2)) 435 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 436 str1, str2); 437 return 0; 438} 439 440/* 441 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 442 * and 0 if they match exactly or the second string is a sub-string 443 * of the first. A warning is printed to stderr in the case that the 444 * first string does not match the third. 445 * 446 * This function exists to warn about the bizzare construction 447 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 448 * for "bytes". The problem is that in addition to accepting "by", 449 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 450 * other string beginning with "by". 451 * 452 * This function will be removed in the future through the usual 453 * deprecation process. 454 */ 455int 456_substrcmp2(const char *str1, const char* str2, const char* str3) 457{ 458 459 if (strncmp(str1, str2, strlen(str2)) != 0) 460 return 1; 461 462 if (strcmp(str1, str3) != 0) 463 warnx("DEPRECATED: '%s' matched '%s'", 464 str1, str3); 465 return 0; 466} 467 468/* 469 * prints one port, symbolic or numeric 470 */ 471static void 472print_port(int proto, uint16_t port) 473{ 474 475 if (proto == IPPROTO_ETHERTYPE) { 476 char const *s; 477 478 if (co.do_resolv && (s = match_value(ether_types, port)) ) 479 printf("%s", s); 480 else 481 printf("0x%04x", port); 482 } else { 483 struct servent *se = NULL; 484 if (co.do_resolv) { 485 struct protoent *pe = getprotobynumber(proto); 486 487 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 488 } 489 if (se) 490 printf("%s", se->s_name); 491 else 492 printf("%d", port); 493 } 494} 495 496static struct _s_x _port_name[] = { 497 {"dst-port", O_IP_DSTPORT}, 498 {"src-port", O_IP_SRCPORT}, 499 {"ipid", O_IPID}, 500 {"iplen", O_IPLEN}, 501 {"ipttl", O_IPTTL}, 502 {"mac-type", O_MAC_TYPE}, 503 {"tcpdatalen", O_TCPDATALEN}, 504 {"tagged", O_TAGGED}, 505 {NULL, 0} 506}; 507 508/* 509 * Print the values in a list 16-bit items of the types above. 510 * XXX todo: add support for mask. 511 */ 512static void 513print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 514{ 515 uint16_t *p = cmd->ports; 516 int i; 517 char const *sep; 518 519 if (opcode != 0) { 520 sep = match_value(_port_name, opcode); 521 if (sep == NULL) 522 sep = "???"; 523 printf (" %s", sep); 524 } 525 sep = " "; 526 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 527 printf("%s", sep); 528 print_port(proto, p[0]); 529 if (p[0] != p[1]) { 530 printf("-"); 531 print_port(proto, p[1]); 532 } 533 sep = ","; 534 } 535} 536 537/* 538 * Like strtol, but also translates service names into port numbers 539 * for some protocols. 540 * In particular: 541 * proto == -1 disables the protocol check; 542 * proto == IPPROTO_ETHERTYPE looks up an internal table 543 * proto == <some value in /etc/protocols> matches the values there. 544 * Returns *end == s in case the parameter is not found. 545 */ 546static int 547strtoport(char *s, char **end, int base, int proto) 548{ 549 char *p, *buf; 550 char *s1; 551 int i; 552 553 *end = s; /* default - not found */ 554 if (*s == '\0') 555 return 0; /* not found */ 556 557 if (isdigit(*s)) 558 return strtol(s, end, base); 559 560 /* 561 * find separator. '\\' escapes the next char. 562 */ 563 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 564 if (*s1 == '\\' && s1[1] != '\0') 565 s1++; 566 567 buf = safe_calloc(s1 - s + 1, 1); 568 569 /* 570 * copy into a buffer skipping backslashes 571 */ 572 for (p = s, i = 0; p != s1 ; p++) 573 if (*p != '\\') 574 buf[i++] = *p; 575 buf[i++] = '\0'; 576 577 if (proto == IPPROTO_ETHERTYPE) { 578 i = match_token(ether_types, buf); 579 free(buf); 580 if (i != -1) { /* found */ 581 *end = s1; 582 return i; 583 } 584 } else { 585 struct protoent *pe = NULL; 586 struct servent *se; 587 588 if (proto != 0) 589 pe = getprotobynumber(proto); 590 setservent(1); 591 se = getservbyname(buf, pe ? pe->p_name : NULL); 592 free(buf); 593 if (se != NULL) { 594 *end = s1; 595 return ntohs(se->s_port); 596 } 597 } 598 return 0; /* not found */ 599} 600 601/* 602 * Fill the body of the command with the list of port ranges. 603 */ 604static int 605fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 606{ 607 uint16_t a, b, *p = cmd->ports; 608 int i = 0; 609 char *s = av; 610 611 while (*s) { 612 a = strtoport(av, &s, 0, proto); 613 if (s == av) /* empty or invalid argument */ 614 return (0); 615 616 switch (*s) { 617 case '-': /* a range */ 618 av = s + 1; 619 b = strtoport(av, &s, 0, proto); 620 /* Reject expressions like '1-abc' or '1-2-3'. */ 621 if (s == av || (*s != ',' && *s != '\0')) 622 return (0); 623 p[0] = a; 624 p[1] = b; 625 break; 626 case ',': /* comma separated list */ 627 case '\0': 628 p[0] = p[1] = a; 629 break; 630 default: 631 warnx("port list: invalid separator <%c> in <%s>", 632 *s, av); 633 return (0); 634 } 635 636 i++; 637 p += 2; 638 av = s + 1; 639 } 640 if (i > 0) { 641 if (i + 1 > F_LEN_MASK) 642 errx(EX_DATAERR, "too many ports/ranges\n"); 643 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 644 } 645 return (i); 646} 647 648static struct _s_x icmpcodes[] = { 649 { "net", ICMP_UNREACH_NET }, 650 { "host", ICMP_UNREACH_HOST }, 651 { "protocol", ICMP_UNREACH_PROTOCOL }, 652 { "port", ICMP_UNREACH_PORT }, 653 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 654 { "srcfail", ICMP_UNREACH_SRCFAIL }, 655 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 656 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 657 { "isolated", ICMP_UNREACH_ISOLATED }, 658 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 659 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 660 { "tosnet", ICMP_UNREACH_TOSNET }, 661 { "toshost", ICMP_UNREACH_TOSHOST }, 662 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 663 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 664 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 665 { NULL, 0 } 666}; 667 668static void 669fill_reject_code(u_short *codep, char *str) 670{ 671 int val; 672 char *s; 673 674 val = strtoul(str, &s, 0); 675 if (s == str || *s != '\0' || val >= 0x100) 676 val = match_token(icmpcodes, str); 677 if (val < 0) 678 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 679 *codep = val; 680 return; 681} 682 683static void 684print_reject_code(uint16_t code) 685{ 686 char const *s = match_value(icmpcodes, code); 687 688 if (s != NULL) 689 printf("unreach %s", s); 690 else 691 printf("unreach %u", code); 692} 693 694/* 695 * Returns the number of bits set (from left) in a contiguous bitmask, 696 * or -1 if the mask is not contiguous. 697 * XXX this needs a proper fix. 698 * This effectively works on masks in big-endian (network) format. 699 * when compiled on little endian architectures. 700 * 701 * First bit is bit 7 of the first byte -- note, for MAC addresses, 702 * the first bit on the wire is bit 0 of the first byte. 703 * len is the max length in bits. 704 */ 705int 706contigmask(uint8_t *p, int len) 707{ 708 int i, n; 709 710 for (i=0; i<len ; i++) 711 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 712 break; 713 for (n=i+1; n < len; n++) 714 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 715 return -1; /* mask not contiguous */ 716 return i; 717} 718 719/* 720 * print flags set/clear in the two bitmasks passed as parameters. 721 * There is a specialized check for f_tcpflags. 722 */ 723static void 724print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 725{ 726 char const *comma = ""; 727 int i; 728 uint8_t set = cmd->arg1 & 0xff; 729 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 730 731 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 732 printf(" setup"); 733 return; 734 } 735 736 printf(" %s ", name); 737 for (i=0; list[i].x != 0; i++) { 738 if (set & list[i].x) { 739 set &= ~list[i].x; 740 printf("%s%s", comma, list[i].s); 741 comma = ","; 742 } 743 if (clear & list[i].x) { 744 clear &= ~list[i].x; 745 printf("%s!%s", comma, list[i].s); 746 comma = ","; 747 } 748 } 749} 750 751/* 752 * Print the ip address contained in a command. 753 */ 754static void 755print_ip(ipfw_insn_ip *cmd, char const *s) 756{ 757 struct hostent *he = NULL; 758 uint32_t len = F_LEN((ipfw_insn *)cmd); 759 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 760 761 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 762 uint32_t d = a[1]; 763 const char *arg = "<invalid>"; 764 765 if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) 766 arg = match_value(rule_options, lookup_key[d]); 767 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "", 768 arg, cmd->o.arg1); 769 return; 770 } 771 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 772 773 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 774 printf("me"); 775 return; 776 } 777 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 778 cmd->o.opcode == O_IP_DST_LOOKUP) { 779 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 780 if (len == F_INSN_SIZE(ipfw_insn_u32)) 781 printf(",%u", *a); 782 printf(")"); 783 return; 784 } 785 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 786 uint32_t x, *map = (uint32_t *)&(cmd->mask); 787 int i, j; 788 char comma = '{'; 789 790 x = cmd->o.arg1 - 1; 791 x = htonl( ~x ); 792 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 793 printf("%s/%d", inet_ntoa(cmd->addr), 794 contigmask((uint8_t *)&x, 32)); 795 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 796 x &= 0xff; /* base */ 797 /* 798 * Print bits and ranges. 799 * Locate first bit set (i), then locate first bit unset (j). 800 * If we have 3+ consecutive bits set, then print them as a 801 * range, otherwise only print the initial bit and rescan. 802 */ 803 for (i=0; i < cmd->o.arg1; i++) 804 if (map[i/32] & (1<<(i & 31))) { 805 for (j=i+1; j < cmd->o.arg1; j++) 806 if (!(map[ j/32] & (1<<(j & 31)))) 807 break; 808 printf("%c%d", comma, i+x); 809 if (j>i+2) { /* range has at least 3 elements */ 810 printf("-%d", j-1+x); 811 i = j-1; 812 } 813 comma = ','; 814 } 815 printf("}"); 816 return; 817 } 818 /* 819 * len == 2 indicates a single IP, whereas lists of 1 or more 820 * addr/mask pairs have len = (2n+1). We convert len to n so we 821 * use that to count the number of entries. 822 */ 823 for (len = len / 2; len > 0; len--, a += 2) { 824 int mb = /* mask length */ 825 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 826 32 : contigmask((uint8_t *)&(a[1]), 32); 827 if (mb == 32 && co.do_resolv) 828 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 829 if (he != NULL) /* resolved to name */ 830 printf("%s", he->h_name); 831 else if (mb == 0) /* any */ 832 printf("any"); 833 else { /* numeric IP followed by some kind of mask */ 834 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 835 if (mb < 0) 836 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 837 else if (mb < 32) 838 printf("/%d", mb); 839 } 840 if (len > 1) 841 printf(","); 842 } 843} 844 845/* 846 * prints a MAC address/mask pair 847 */ 848static void 849print_mac(uint8_t *addr, uint8_t *mask) 850{ 851 int l = contigmask(mask, 48); 852 853 if (l == 0) 854 printf(" any"); 855 else { 856 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 857 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 858 if (l == -1) 859 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 860 mask[0], mask[1], mask[2], 861 mask[3], mask[4], mask[5]); 862 else if (l < 48) 863 printf("/%d", l); 864 } 865} 866 867static void 868fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 869{ 870 uint8_t type; 871 872 cmd->d[0] = 0; 873 while (*av) { 874 if (*av == ',') 875 av++; 876 877 type = strtoul(av, &av, 0); 878 879 if (*av != ',' && *av != '\0') 880 errx(EX_DATAERR, "invalid ICMP type"); 881 882 if (type > 31) 883 errx(EX_DATAERR, "ICMP type out of range"); 884 885 cmd->d[0] |= 1 << type; 886 } 887 cmd->o.opcode = O_ICMPTYPE; 888 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 889} 890 891static void 892print_icmptypes(ipfw_insn_u32 *cmd) 893{ 894 int i; 895 char sep= ' '; 896 897 printf(" icmptypes"); 898 for (i = 0; i < 32; i++) { 899 if ( (cmd->d[0] & (1 << (i))) == 0) 900 continue; 901 printf("%c%d", sep, i); 902 sep = ','; 903 } 904} 905 906/* 907 * show_ipfw() prints the body of an ipfw rule. 908 * Because the standard rule has at least proto src_ip dst_ip, we use 909 * a helper function to produce these entries if not provided explicitly. 910 * The first argument is the list of fields we have, the second is 911 * the list of fields we want to be printed. 912 * 913 * Special cases if we have provided a MAC header: 914 * + if the rule does not contain IP addresses/ports, do not print them; 915 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 916 * 917 * Once we have 'have_options', IP header fields are printed as options. 918 */ 919#define HAVE_PROTO 0x0001 920#define HAVE_SRCIP 0x0002 921#define HAVE_DSTIP 0x0004 922#define HAVE_PROTO4 0x0008 923#define HAVE_PROTO6 0x0010 924#define HAVE_OPTIONS 0x8000 925 926#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 927static void 928show_prerequisites(int *flags, int want, int cmd __unused) 929{ 930 if (co.comment_only) 931 return; 932 if ( (*flags & HAVE_IP) == HAVE_IP) 933 *flags |= HAVE_OPTIONS; 934 935 if ( !(*flags & HAVE_OPTIONS)) { 936 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 937 if ( (*flags & HAVE_PROTO4)) 938 printf(" ip4"); 939 else if ( (*flags & HAVE_PROTO6)) 940 printf(" ip6"); 941 else 942 printf(" ip"); 943 } 944 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 945 printf(" from any"); 946 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 947 printf(" to any"); 948 } 949 *flags |= want; 950} 951 952static void 953show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 954{ 955 static int twidth = 0; 956 int l; 957 ipfw_insn *cmd, *tagptr = NULL; 958 const char *comment = NULL; /* ptr to comment if we have one */ 959 int proto = 0; /* default */ 960 int flags = 0; /* prerequisites */ 961 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 962 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 963 int or_block = 0; /* we are in an or block */ 964 uint32_t set_disable; 965 966 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 967 968 if (set_disable & (1 << rule->set)) { /* disabled */ 969 if (!co.show_sets) 970 return; 971 else 972 printf("# DISABLED "); 973 } 974 printf("%05u ", rule->rulenum); 975 976 if (pcwidth>0 || bcwidth>0) 977 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 978 bcwidth, align_uint64(&rule->bcnt)); 979 980 if (co.do_time == 2) 981 printf("%10u ", rule->timestamp); 982 else if (co.do_time == 1) { 983 char timestr[30]; 984 time_t t = (time_t)0; 985 986 if (twidth == 0) { 987 strcpy(timestr, ctime(&t)); 988 *strchr(timestr, '\n') = '\0'; 989 twidth = strlen(timestr); 990 } 991 if (rule->timestamp) { 992 t = _long_to_time(rule->timestamp); 993 994 strcpy(timestr, ctime(&t)); 995 *strchr(timestr, '\n') = '\0'; 996 printf("%s ", timestr); 997 } else { 998 printf("%*s", twidth, " "); 999 } 1000 } 1001 1002 if (co.show_sets) 1003 printf("set %d ", rule->set); 1004 1005 /* 1006 * print the optional "match probability" 1007 */ 1008 if (rule->cmd_len > 0) { 1009 cmd = rule->cmd ; 1010 if (cmd->opcode == O_PROB) { 1011 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1012 double d = 1.0 * p->d[0]; 1013 1014 d = (d / 0x7fffffff); 1015 printf("prob %f ", d); 1016 } 1017 } 1018 1019 /* 1020 * first print actions 1021 */ 1022 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1023 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1024 switch(cmd->opcode) { 1025 case O_CHECK_STATE: 1026 printf("check-state"); 1027 flags = HAVE_IP; /* avoid printing anything else */ 1028 break; 1029 1030 case O_ACCEPT: 1031 printf("allow"); 1032 break; 1033 1034 case O_COUNT: 1035 printf("count"); 1036 break; 1037 1038 case O_DENY: 1039 printf("deny"); 1040 break; 1041 1042 case O_REJECT: 1043 if (cmd->arg1 == ICMP_REJECT_RST) 1044 printf("reset"); 1045 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1046 printf("reject"); 1047 else 1048 print_reject_code(cmd->arg1); 1049 break; 1050 1051 case O_UNREACH6: 1052 if (cmd->arg1 == ICMP6_UNREACH_RST) 1053 printf("reset6"); 1054 else 1055 print_unreach6_code(cmd->arg1); 1056 break; 1057 1058 case O_SKIPTO: 1059 PRINT_UINT_ARG("skipto ", cmd->arg1); 1060 break; 1061 1062 case O_PIPE: 1063 PRINT_UINT_ARG("pipe ", cmd->arg1); 1064 break; 1065 1066 case O_QUEUE: 1067 PRINT_UINT_ARG("queue ", cmd->arg1); 1068 break; 1069 1070 case O_DIVERT: 1071 PRINT_UINT_ARG("divert ", cmd->arg1); 1072 break; 1073 1074 case O_TEE: 1075 PRINT_UINT_ARG("tee ", cmd->arg1); 1076 break; 1077 1078 case O_NETGRAPH: 1079 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1080 break; 1081 1082 case O_NGTEE: 1083 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1084 break; 1085 1086 case O_FORWARD_IP: 1087 { 1088 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1089 1090 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1091 printf("fwd tablearg"); 1092 } else { 1093 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1094 } 1095 if (s->sa.sin_port) 1096 printf(",%d", s->sa.sin_port); 1097 } 1098 break; 1099 1100 case O_LOG: /* O_LOG is printed last */ 1101 logptr = (ipfw_insn_log *)cmd; 1102 break; 1103 1104 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1105 altqptr = (ipfw_insn_altq *)cmd; 1106 break; 1107 1108 case O_TAG: 1109 tagptr = cmd; 1110 break; 1111 1112 case O_NAT: 1113 PRINT_UINT_ARG("nat ", cmd->arg1); 1114 break; 1115 1116 case O_SETFIB: 1117 PRINT_UINT_ARG("setfib ", cmd->arg1); 1118 break; 1119 1120 case O_REASS: 1121 printf("reass"); 1122 break; 1123 1124 default: 1125 printf("** unrecognized action %d len %d ", 1126 cmd->opcode, cmd->len); 1127 } 1128 } 1129 if (logptr) { 1130 if (logptr->max_log > 0) 1131 printf(" log logamount %d", logptr->max_log); 1132 else 1133 printf(" log"); 1134 } 1135#ifndef NO_ALTQ 1136 if (altqptr) { 1137 print_altq_cmd(altqptr); 1138 } 1139#endif 1140 if (tagptr) { 1141 if (tagptr->len & F_NOT) 1142 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1143 else 1144 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1145 } 1146 1147 /* 1148 * then print the body. 1149 */ 1150 for (l = rule->act_ofs, cmd = rule->cmd ; 1151 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1152 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1153 continue; 1154 if (cmd->opcode == O_IP4) { 1155 flags |= HAVE_PROTO4; 1156 break; 1157 } else if (cmd->opcode == O_IP6) { 1158 flags |= HAVE_PROTO6; 1159 break; 1160 } 1161 } 1162 if (rule->_pad & 1) { /* empty rules before options */ 1163 if (!co.do_compact) { 1164 show_prerequisites(&flags, HAVE_PROTO, 0); 1165 printf(" from any to any"); 1166 } 1167 flags |= HAVE_IP | HAVE_OPTIONS; 1168 } 1169 1170 if (co.comment_only) 1171 comment = "..."; 1172 1173 for (l = rule->act_ofs, cmd = rule->cmd ; 1174 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1175 /* useful alias */ 1176 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1177 1178 if (co.comment_only) { 1179 if (cmd->opcode != O_NOP) 1180 continue; 1181 printf(" // %s\n", (char *)(cmd + 1)); 1182 return; 1183 } 1184 1185 show_prerequisites(&flags, 0, cmd->opcode); 1186 1187 switch(cmd->opcode) { 1188 case O_PROB: 1189 break; /* done already */ 1190 1191 case O_PROBE_STATE: 1192 break; /* no need to print anything here */ 1193 1194 case O_IP_SRC: 1195 case O_IP_SRC_LOOKUP: 1196 case O_IP_SRC_MASK: 1197 case O_IP_SRC_ME: 1198 case O_IP_SRC_SET: 1199 show_prerequisites(&flags, HAVE_PROTO, 0); 1200 if (!(flags & HAVE_SRCIP)) 1201 printf(" from"); 1202 if ((cmd->len & F_OR) && !or_block) 1203 printf(" {"); 1204 print_ip((ipfw_insn_ip *)cmd, 1205 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1206 flags |= HAVE_SRCIP; 1207 break; 1208 1209 case O_IP_DST: 1210 case O_IP_DST_LOOKUP: 1211 case O_IP_DST_MASK: 1212 case O_IP_DST_ME: 1213 case O_IP_DST_SET: 1214 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1215 if (!(flags & HAVE_DSTIP)) 1216 printf(" to"); 1217 if ((cmd->len & F_OR) && !or_block) 1218 printf(" {"); 1219 print_ip((ipfw_insn_ip *)cmd, 1220 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1221 flags |= HAVE_DSTIP; 1222 break; 1223 1224 case O_IP6_SRC: 1225 case O_IP6_SRC_MASK: 1226 case O_IP6_SRC_ME: 1227 show_prerequisites(&flags, HAVE_PROTO, 0); 1228 if (!(flags & HAVE_SRCIP)) 1229 printf(" from"); 1230 if ((cmd->len & F_OR) && !or_block) 1231 printf(" {"); 1232 print_ip6((ipfw_insn_ip6 *)cmd, 1233 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1234 flags |= HAVE_SRCIP | HAVE_PROTO; 1235 break; 1236 1237 case O_IP6_DST: 1238 case O_IP6_DST_MASK: 1239 case O_IP6_DST_ME: 1240 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1241 if (!(flags & HAVE_DSTIP)) 1242 printf(" to"); 1243 if ((cmd->len & F_OR) && !or_block) 1244 printf(" {"); 1245 print_ip6((ipfw_insn_ip6 *)cmd, 1246 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1247 flags |= HAVE_DSTIP; 1248 break; 1249 1250 case O_FLOW6ID: 1251 print_flow6id( (ipfw_insn_u32 *) cmd ); 1252 flags |= HAVE_OPTIONS; 1253 break; 1254 1255 case O_IP_DSTPORT: 1256 show_prerequisites(&flags, HAVE_IP, 0); 1257 case O_IP_SRCPORT: 1258 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1259 if ((cmd->len & F_OR) && !or_block) 1260 printf(" {"); 1261 if (cmd->len & F_NOT) 1262 printf(" not"); 1263 print_newports((ipfw_insn_u16 *)cmd, proto, 1264 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1265 break; 1266 1267 case O_PROTO: { 1268 struct protoent *pe = NULL; 1269 1270 if ((cmd->len & F_OR) && !or_block) 1271 printf(" {"); 1272 if (cmd->len & F_NOT) 1273 printf(" not"); 1274 proto = cmd->arg1; 1275 pe = getprotobynumber(cmd->arg1); 1276 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1277 !(flags & HAVE_PROTO)) 1278 show_prerequisites(&flags, 1279 HAVE_IP | HAVE_OPTIONS, 0); 1280 if (flags & HAVE_OPTIONS) 1281 printf(" proto"); 1282 if (pe) 1283 printf(" %s", pe->p_name); 1284 else 1285 printf(" %u", cmd->arg1); 1286 } 1287 flags |= HAVE_PROTO; 1288 break; 1289 1290 default: /*options ... */ 1291 if (!(cmd->len & (F_OR|F_NOT))) 1292 if (((cmd->opcode == O_IP6) && 1293 (flags & HAVE_PROTO6)) || 1294 ((cmd->opcode == O_IP4) && 1295 (flags & HAVE_PROTO4))) 1296 break; 1297 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1298 if ((cmd->len & F_OR) && !or_block) 1299 printf(" {"); 1300 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1301 printf(" not"); 1302 switch(cmd->opcode) { 1303 case O_MACADDR2: { 1304 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1305 1306 printf(" MAC"); 1307 print_mac(m->addr, m->mask); 1308 print_mac(m->addr + 6, m->mask + 6); 1309 } 1310 break; 1311 1312 case O_MAC_TYPE: 1313 print_newports((ipfw_insn_u16 *)cmd, 1314 IPPROTO_ETHERTYPE, cmd->opcode); 1315 break; 1316 1317 1318 case O_FRAG: 1319 printf(" frag"); 1320 break; 1321 1322 case O_FIB: 1323 printf(" fib %u", cmd->arg1 ); 1324 break; 1325 1326 case O_IN: 1327 printf(cmd->len & F_NOT ? " out" : " in"); 1328 break; 1329 1330 case O_DIVERTED: 1331 switch (cmd->arg1) { 1332 case 3: 1333 printf(" diverted"); 1334 break; 1335 case 1: 1336 printf(" diverted-loopback"); 1337 break; 1338 case 2: 1339 printf(" diverted-output"); 1340 break; 1341 default: 1342 printf(" diverted-?<%u>", cmd->arg1); 1343 break; 1344 } 1345 break; 1346 1347 case O_LAYER2: 1348 printf(" layer2"); 1349 break; 1350 case O_XMIT: 1351 case O_RECV: 1352 case O_VIA: 1353 { 1354 char const *s; 1355 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1356 1357 if (cmd->opcode == O_XMIT) 1358 s = "xmit"; 1359 else if (cmd->opcode == O_RECV) 1360 s = "recv"; 1361 else /* if (cmd->opcode == O_VIA) */ 1362 s = "via"; 1363 if (cmdif->name[0] == '\0') 1364 printf(" %s %s", s, 1365 inet_ntoa(cmdif->p.ip)); 1366 else 1367 printf(" %s %s", s, cmdif->name); 1368 1369 break; 1370 } 1371 case O_IPID: 1372 if (F_LEN(cmd) == 1) 1373 printf(" ipid %u", cmd->arg1 ); 1374 else 1375 print_newports((ipfw_insn_u16 *)cmd, 0, 1376 O_IPID); 1377 break; 1378 1379 case O_IPTTL: 1380 if (F_LEN(cmd) == 1) 1381 printf(" ipttl %u", cmd->arg1 ); 1382 else 1383 print_newports((ipfw_insn_u16 *)cmd, 0, 1384 O_IPTTL); 1385 break; 1386 1387 case O_IPVER: 1388 printf(" ipver %u", cmd->arg1 ); 1389 break; 1390 1391 case O_IPPRECEDENCE: 1392 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1393 break; 1394 1395 case O_IPLEN: 1396 if (F_LEN(cmd) == 1) 1397 printf(" iplen %u", cmd->arg1 ); 1398 else 1399 print_newports((ipfw_insn_u16 *)cmd, 0, 1400 O_IPLEN); 1401 break; 1402 1403 case O_IPOPT: 1404 print_flags("ipoptions", cmd, f_ipopts); 1405 break; 1406 1407 case O_IPTOS: 1408 print_flags("iptos", cmd, f_iptos); 1409 break; 1410 1411 case O_ICMPTYPE: 1412 print_icmptypes((ipfw_insn_u32 *)cmd); 1413 break; 1414 1415 case O_ESTAB: 1416 printf(" established"); 1417 break; 1418 1419 case O_TCPDATALEN: 1420 if (F_LEN(cmd) == 1) 1421 printf(" tcpdatalen %u", cmd->arg1 ); 1422 else 1423 print_newports((ipfw_insn_u16 *)cmd, 0, 1424 O_TCPDATALEN); 1425 break; 1426 1427 case O_TCPFLAGS: 1428 print_flags("tcpflags", cmd, f_tcpflags); 1429 break; 1430 1431 case O_TCPOPTS: 1432 print_flags("tcpoptions", cmd, f_tcpopts); 1433 break; 1434 1435 case O_TCPWIN: 1436 printf(" tcpwin %d", ntohs(cmd->arg1)); 1437 break; 1438 1439 case O_TCPACK: 1440 printf(" tcpack %d", ntohl(cmd32->d[0])); 1441 break; 1442 1443 case O_TCPSEQ: 1444 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1445 break; 1446 1447 case O_UID: 1448 { 1449 struct passwd *pwd = getpwuid(cmd32->d[0]); 1450 1451 if (pwd) 1452 printf(" uid %s", pwd->pw_name); 1453 else 1454 printf(" uid %u", cmd32->d[0]); 1455 } 1456 break; 1457 1458 case O_GID: 1459 { 1460 struct group *grp = getgrgid(cmd32->d[0]); 1461 1462 if (grp) 1463 printf(" gid %s", grp->gr_name); 1464 else 1465 printf(" gid %u", cmd32->d[0]); 1466 } 1467 break; 1468 1469 case O_JAIL: 1470 printf(" jail %d", cmd32->d[0]); 1471 break; 1472 1473 case O_VERREVPATH: 1474 printf(" verrevpath"); 1475 break; 1476 1477 case O_VERSRCREACH: 1478 printf(" versrcreach"); 1479 break; 1480 1481 case O_ANTISPOOF: 1482 printf(" antispoof"); 1483 break; 1484 1485 case O_IPSEC: 1486 printf(" ipsec"); 1487 break; 1488 1489 case O_NOP: 1490 comment = (char *)(cmd + 1); 1491 break; 1492 1493 case O_KEEP_STATE: 1494 printf(" keep-state"); 1495 break; 1496 1497 case O_LIMIT: { 1498 struct _s_x *p = limit_masks; 1499 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1500 uint8_t x = c->limit_mask; 1501 char const *comma = " "; 1502 1503 printf(" limit"); 1504 for (; p->x != 0 ; p++) 1505 if ((x & p->x) == p->x) { 1506 x &= ~p->x; 1507 printf("%s%s", comma, p->s); 1508 comma = ","; 1509 } 1510 PRINT_UINT_ARG(" ", c->conn_limit); 1511 break; 1512 } 1513 1514 case O_IP6: 1515 printf(" ip6"); 1516 break; 1517 1518 case O_IP4: 1519 printf(" ip4"); 1520 break; 1521 1522 case O_ICMP6TYPE: 1523 print_icmp6types((ipfw_insn_u32 *)cmd); 1524 break; 1525 1526 case O_EXT_HDR: 1527 print_ext6hdr( (ipfw_insn *) cmd ); 1528 break; 1529 1530 case O_TAGGED: 1531 if (F_LEN(cmd) == 1) 1532 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1533 else 1534 print_newports((ipfw_insn_u16 *)cmd, 0, 1535 O_TAGGED); 1536 break; 1537 1538 default: 1539 printf(" [opcode %d len %d]", 1540 cmd->opcode, cmd->len); 1541 } 1542 } 1543 if (cmd->len & F_OR) { 1544 printf(" or"); 1545 or_block = 1; 1546 } else if (or_block) { 1547 printf(" }"); 1548 or_block = 0; 1549 } 1550 } 1551 show_prerequisites(&flags, HAVE_IP, 0); 1552 if (comment) 1553 printf(" // %s", comment); 1554 printf("\n"); 1555} 1556 1557static void 1558show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1559{ 1560 struct protoent *pe; 1561 struct in_addr a; 1562 uint16_t rulenum; 1563 char buf[INET6_ADDRSTRLEN]; 1564 1565 if (!co.do_expired) { 1566 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1567 return; 1568 } 1569 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1570 printf("%05d", rulenum); 1571 if (pcwidth>0 || bcwidth>0) 1572 printf(" %*llu %*llu (%ds)", pcwidth, 1573 align_uint64(&d->pcnt), bcwidth, 1574 align_uint64(&d->bcnt), d->expire); 1575 switch (d->dyn_type) { 1576 case O_LIMIT_PARENT: 1577 printf(" PARENT %d", d->count); 1578 break; 1579 case O_LIMIT: 1580 printf(" LIMIT"); 1581 break; 1582 case O_KEEP_STATE: /* bidir, no mask */ 1583 printf(" STATE"); 1584 break; 1585 } 1586 1587 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1588 printf(" %s", pe->p_name); 1589 else 1590 printf(" proto %u", d->id.proto); 1591 1592 if (d->id.addr_type == 4) { 1593 a.s_addr = htonl(d->id.src_ip); 1594 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1595 1596 a.s_addr = htonl(d->id.dst_ip); 1597 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1598 } else if (d->id.addr_type == 6) { 1599 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1600 sizeof(buf)), d->id.src_port); 1601 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1602 sizeof(buf)), d->id.dst_port); 1603 } else 1604 printf(" UNKNOWN <-> UNKNOWN\n"); 1605 1606 printf("\n"); 1607} 1608 1609/* 1610 * This one handles all set-related commands 1611 * ipfw set { show | enable | disable } 1612 * ipfw set swap X Y 1613 * ipfw set move X to Y 1614 * ipfw set move rule X to Y 1615 */ 1616void 1617ipfw_sets_handler(char *av[]) 1618{ 1619 uint32_t set_disable, masks[2]; 1620 int i, nbytes; 1621 uint16_t rulenum; 1622 uint8_t cmd, new_set; 1623 1624 av++; 1625 1626 if (av[0] == NULL) 1627 errx(EX_USAGE, "set needs command"); 1628 if (_substrcmp(*av, "show") == 0) { 1629 void *data = NULL; 1630 char const *msg; 1631 int nalloc; 1632 1633 nalloc = nbytes = sizeof(struct ip_fw); 1634 while (nbytes >= nalloc) { 1635 if (data) 1636 free(data); 1637 nalloc = nalloc * 2 + 200; 1638 nbytes = nalloc; 1639 data = safe_calloc(1, nbytes); 1640 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1641 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1642 } 1643 1644 bcopy(&((struct ip_fw *)data)->next_rule, 1645 &set_disable, sizeof(set_disable)); 1646 1647 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1648 if ((set_disable & (1<<i))) { 1649 printf("%s %d", msg, i); 1650 msg = ""; 1651 } 1652 msg = (set_disable) ? " enable" : "enable"; 1653 for (i = 0; i < RESVD_SET; i++) 1654 if (!(set_disable & (1<<i))) { 1655 printf("%s %d", msg, i); 1656 msg = ""; 1657 } 1658 printf("\n"); 1659 } else if (_substrcmp(*av, "swap") == 0) { 1660 av++; 1661 if ( av[0] == NULL || av[1] == NULL ) 1662 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1663 rulenum = atoi(av[0]); 1664 new_set = atoi(av[1]); 1665 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1666 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1667 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1668 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1669 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1670 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1671 } else if (_substrcmp(*av, "move") == 0) { 1672 av++; 1673 if (av[0] && _substrcmp(*av, "rule") == 0) { 1674 cmd = 2; 1675 av++; 1676 } else 1677 cmd = 3; 1678 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 1679 av[3] != NULL || _substrcmp(av[1], "to") != 0) 1680 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1681 rulenum = atoi(av[0]); 1682 new_set = atoi(av[2]); 1683 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1684 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1685 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1686 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1687 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1688 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1689 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1690 } else if (_substrcmp(*av, "disable") == 0 || 1691 _substrcmp(*av, "enable") == 0 ) { 1692 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1693 1694 av++; 1695 masks[0] = masks[1] = 0; 1696 1697 while (av[0]) { 1698 if (isdigit(**av)) { 1699 i = atoi(*av); 1700 if (i < 0 || i > RESVD_SET) 1701 errx(EX_DATAERR, 1702 "invalid set number %d\n", i); 1703 masks[which] |= (1<<i); 1704 } else if (_substrcmp(*av, "disable") == 0) 1705 which = 0; 1706 else if (_substrcmp(*av, "enable") == 0) 1707 which = 1; 1708 else 1709 errx(EX_DATAERR, 1710 "invalid set command %s\n", *av); 1711 av++; 1712 } 1713 if ( (masks[0] & masks[1]) != 0 ) 1714 errx(EX_DATAERR, 1715 "cannot enable and disable the same set\n"); 1716 1717 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1718 if (i) 1719 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1720 } else 1721 errx(EX_USAGE, "invalid set command %s\n", *av); 1722} 1723 1724void 1725ipfw_sysctl_handler(char *av[], int which) 1726{ 1727 av++; 1728 1729 if (av[0] == NULL) { 1730 warnx("missing keyword to enable/disable\n"); 1731 } else if (_substrcmp(*av, "firewall") == 0) { 1732 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1733 &which, sizeof(which)); 1734 } else if (_substrcmp(*av, "one_pass") == 0) { 1735 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1736 &which, sizeof(which)); 1737 } else if (_substrcmp(*av, "debug") == 0) { 1738 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1739 &which, sizeof(which)); 1740 } else if (_substrcmp(*av, "verbose") == 0) { 1741 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1742 &which, sizeof(which)); 1743 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1744 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1745 &which, sizeof(which)); 1746#ifndef NO_ALTQ 1747 } else if (_substrcmp(*av, "altq") == 0) { 1748 altq_set_enabled(which); 1749#endif 1750 } else { 1751 warnx("unrecognize enable/disable keyword: %s\n", *av); 1752 } 1753} 1754 1755void 1756ipfw_list(int ac, char *av[], int show_counters) 1757{ 1758 struct ip_fw *r; 1759 ipfw_dyn_rule *dynrules, *d; 1760 1761#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1762 char *lim; 1763 void *data = NULL; 1764 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1765 int exitval = EX_OK; 1766 int lac; 1767 char **lav; 1768 u_long rnum, last; 1769 char *endptr; 1770 int seen = 0; 1771 uint8_t set; 1772 1773 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1774 int nalloc = 1024; /* start somewhere... */ 1775 1776 last = 0; 1777 1778 if (co.test_only) { 1779 fprintf(stderr, "Testing only, list disabled\n"); 1780 return; 1781 } 1782 if (co.do_pipe) { 1783 dummynet_list(ac, av, show_counters); 1784 return; 1785 } 1786 1787 ac--; 1788 av++; 1789 1790 /* get rules or pipes from kernel, resizing array as necessary */ 1791 nbytes = nalloc; 1792 1793 while (nbytes >= nalloc) { 1794 nalloc = nalloc * 2 + 200; 1795 nbytes = nalloc; 1796 data = safe_realloc(data, nbytes); 1797 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1798 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1799 co.do_pipe ? "DUMMYNET" : "FW"); 1800 } 1801 1802 /* 1803 * Count static rules. They have variable size so we 1804 * need to scan the list to count them. 1805 */ 1806 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1807 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1808 ++nstat, r = NEXT(r) ) 1809 ; /* nothing */ 1810 1811 /* 1812 * Count dynamic rules. This is easier as they have 1813 * fixed size. 1814 */ 1815 r = NEXT(r); 1816 dynrules = (ipfw_dyn_rule *)r ; 1817 n = (char *)r - (char *)data; 1818 ndyn = (nbytes - n) / sizeof *dynrules; 1819 1820 /* if showing stats, figure out column widths ahead of time */ 1821 bcwidth = pcwidth = 0; 1822 if (show_counters) { 1823 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1824 /* skip rules from another set */ 1825 if (co.use_set && r->set != co.use_set - 1) 1826 continue; 1827 1828 /* packet counter */ 1829 width = snprintf(NULL, 0, "%llu", 1830 align_uint64(&r->pcnt)); 1831 if (width > pcwidth) 1832 pcwidth = width; 1833 1834 /* byte counter */ 1835 width = snprintf(NULL, 0, "%llu", 1836 align_uint64(&r->bcnt)); 1837 if (width > bcwidth) 1838 bcwidth = width; 1839 } 1840 } 1841 if (co.do_dynamic && ndyn) { 1842 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1843 if (co.use_set) { 1844 /* skip rules from another set */ 1845 bcopy((char *)&d->rule + sizeof(uint16_t), 1846 &set, sizeof(uint8_t)); 1847 if (set != co.use_set - 1) 1848 continue; 1849 } 1850 width = snprintf(NULL, 0, "%llu", 1851 align_uint64(&d->pcnt)); 1852 if (width > pcwidth) 1853 pcwidth = width; 1854 1855 width = snprintf(NULL, 0, "%llu", 1856 align_uint64(&d->bcnt)); 1857 if (width > bcwidth) 1858 bcwidth = width; 1859 } 1860 } 1861 /* if no rule numbers were specified, list all rules */ 1862 if (ac == 0) { 1863 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1864 if (co.use_set && r->set != co.use_set - 1) 1865 continue; 1866 show_ipfw(r, pcwidth, bcwidth); 1867 } 1868 1869 if (co.do_dynamic && ndyn) { 1870 printf("## Dynamic rules (%d):\n", ndyn); 1871 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1872 if (co.use_set) { 1873 bcopy((char *)&d->rule + sizeof(uint16_t), 1874 &set, sizeof(uint8_t)); 1875 if (set != co.use_set - 1) 1876 continue; 1877 } 1878 show_dyn_ipfw(d, pcwidth, bcwidth); 1879 } 1880 } 1881 goto done; 1882 } 1883 1884 /* display specific rules requested on command line */ 1885 1886 for (lac = ac, lav = av; lac != 0; lac--) { 1887 /* convert command line rule # */ 1888 last = rnum = strtoul(*lav++, &endptr, 10); 1889 if (*endptr == '-') 1890 last = strtoul(endptr+1, &endptr, 10); 1891 if (*endptr) { 1892 exitval = EX_USAGE; 1893 warnx("invalid rule number: %s", *(lav - 1)); 1894 continue; 1895 } 1896 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1897 if (r->rulenum > last) 1898 break; 1899 if (co.use_set && r->set != co.use_set - 1) 1900 continue; 1901 if (r->rulenum >= rnum && r->rulenum <= last) { 1902 show_ipfw(r, pcwidth, bcwidth); 1903 seen = 1; 1904 } 1905 } 1906 if (!seen) { 1907 /* give precedence to other error(s) */ 1908 if (exitval == EX_OK) 1909 exitval = EX_UNAVAILABLE; 1910 warnx("rule %lu does not exist", rnum); 1911 } 1912 } 1913 1914 if (co.do_dynamic && ndyn) { 1915 printf("## Dynamic rules:\n"); 1916 for (lac = ac, lav = av; lac != 0; lac--) { 1917 last = rnum = strtoul(*lav++, &endptr, 10); 1918 if (*endptr == '-') 1919 last = strtoul(endptr+1, &endptr, 10); 1920 if (*endptr) 1921 /* already warned */ 1922 continue; 1923 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1924 uint16_t rulenum; 1925 1926 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1927 if (rulenum > rnum) 1928 break; 1929 if (co.use_set) { 1930 bcopy((char *)&d->rule + sizeof(uint16_t), 1931 &set, sizeof(uint8_t)); 1932 if (set != co.use_set - 1) 1933 continue; 1934 } 1935 if (r->rulenum >= rnum && r->rulenum <= last) 1936 show_dyn_ipfw(d, pcwidth, bcwidth); 1937 } 1938 } 1939 } 1940 1941 ac = 0; 1942 1943done: 1944 free(data); 1945 1946 if (exitval != EX_OK) 1947 exit(exitval); 1948#undef NEXT 1949} 1950 1951static int 1952lookup_host (char *host, struct in_addr *ipaddr) 1953{ 1954 struct hostent *he; 1955 1956 if (!inet_aton(host, ipaddr)) { 1957 if ((he = gethostbyname(host)) == NULL) 1958 return(-1); 1959 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1960 } 1961 return(0); 1962} 1963 1964/* 1965 * fills the addr and mask fields in the instruction as appropriate from av. 1966 * Update length as appropriate. 1967 * The following formats are allowed: 1968 * me returns O_IP_*_ME 1969 * 1.2.3.4 single IP address 1970 * 1.2.3.4:5.6.7.8 address:mask 1971 * 1.2.3.4/24 address/mask 1972 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1973 * We can have multiple comma-separated address/mask entries. 1974 */ 1975static void 1976fill_ip(ipfw_insn_ip *cmd, char *av) 1977{ 1978 int len = 0; 1979 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1980 1981 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1982 1983 if (_substrcmp(av, "any") == 0) 1984 return; 1985 1986 if (_substrcmp(av, "me") == 0) { 1987 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1988 return; 1989 } 1990 1991 if (strncmp(av, "table(", 6) == 0) { 1992 char *p = strchr(av + 6, ','); 1993 1994 if (p) 1995 *p++ = '\0'; 1996 cmd->o.opcode = O_IP_DST_LOOKUP; 1997 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 1998 if (p) { 1999 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2000 d[0] = strtoul(p, NULL, 0); 2001 } else 2002 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2003 return; 2004 } 2005 2006 while (av) { 2007 /* 2008 * After the address we can have '/' or ':' indicating a mask, 2009 * ',' indicating another address follows, '{' indicating a 2010 * set of addresses of unspecified size. 2011 */ 2012 char *t = NULL, *p = strpbrk(av, "/:,{"); 2013 int masklen; 2014 char md, nd = '\0'; 2015 2016 if (p) { 2017 md = *p; 2018 *p++ = '\0'; 2019 if ((t = strpbrk(p, ",{")) != NULL) { 2020 nd = *t; 2021 *t = '\0'; 2022 } 2023 } else 2024 md = '\0'; 2025 2026 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2027 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2028 switch (md) { 2029 case ':': 2030 if (!inet_aton(p, (struct in_addr *)&d[1])) 2031 errx(EX_DATAERR, "bad netmask ``%s''", p); 2032 break; 2033 case '/': 2034 masklen = atoi(p); 2035 if (masklen == 0) 2036 d[1] = htonl(0); /* mask */ 2037 else if (masklen > 32) 2038 errx(EX_DATAERR, "bad width ``%s''", p); 2039 else 2040 d[1] = htonl(~0 << (32 - masklen)); 2041 break; 2042 case '{': /* no mask, assume /24 and put back the '{' */ 2043 d[1] = htonl(~0 << (32 - 24)); 2044 *(--p) = md; 2045 break; 2046 2047 case ',': /* single address plus continuation */ 2048 *(--p) = md; 2049 /* FALLTHROUGH */ 2050 case 0: /* initialization value */ 2051 default: 2052 d[1] = htonl(~0); /* force /32 */ 2053 break; 2054 } 2055 d[0] &= d[1]; /* mask base address with mask */ 2056 if (t) 2057 *t = nd; 2058 /* find next separator */ 2059 if (p) 2060 p = strpbrk(p, ",{"); 2061 if (p && *p == '{') { 2062 /* 2063 * We have a set of addresses. They are stored as follows: 2064 * arg1 is the set size (powers of 2, 2..256) 2065 * addr is the base address IN HOST FORMAT 2066 * mask.. is an array of arg1 bits (rounded up to 2067 * the next multiple of 32) with bits set 2068 * for each host in the map. 2069 */ 2070 uint32_t *map = (uint32_t *)&cmd->mask; 2071 int low, high; 2072 int i = contigmask((uint8_t *)&(d[1]), 32); 2073 2074 if (len > 0) 2075 errx(EX_DATAERR, "address set cannot be in a list"); 2076 if (i < 24 || i > 31) 2077 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2078 cmd->o.arg1 = 1<<(32-i); /* map length */ 2079 d[0] = ntohl(d[0]); /* base addr in host format */ 2080 cmd->o.opcode = O_IP_DST_SET; /* default */ 2081 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2082 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2083 map[i] = 0; /* clear map */ 2084 2085 av = p + 1; 2086 low = d[0] & 0xff; 2087 high = low + cmd->o.arg1 - 1; 2088 /* 2089 * Here, i stores the previous value when we specify a range 2090 * of addresses within a mask, e.g. 45-63. i = -1 means we 2091 * have no previous value. 2092 */ 2093 i = -1; /* previous value in a range */ 2094 while (isdigit(*av)) { 2095 char *s; 2096 int a = strtol(av, &s, 0); 2097 2098 if (s == av) { /* no parameter */ 2099 if (*av != '}') 2100 errx(EX_DATAERR, "set not closed\n"); 2101 if (i != -1) 2102 errx(EX_DATAERR, "incomplete range %d-", i); 2103 break; 2104 } 2105 if (a < low || a > high) 2106 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2107 a, low, high); 2108 a -= low; 2109 if (i == -1) /* no previous in range */ 2110 i = a; 2111 else { /* check that range is valid */ 2112 if (i > a) 2113 errx(EX_DATAERR, "invalid range %d-%d", 2114 i+low, a+low); 2115 if (*s == '-') 2116 errx(EX_DATAERR, "double '-' in range"); 2117 } 2118 for (; i <= a; i++) 2119 map[i/32] |= 1<<(i & 31); 2120 i = -1; 2121 if (*s == '-') 2122 i = a; 2123 else if (*s == '}') 2124 break; 2125 av = s+1; 2126 } 2127 return; 2128 } 2129 av = p; 2130 if (av) /* then *av must be a ',' */ 2131 av++; 2132 2133 /* Check this entry */ 2134 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2135 /* 2136 * 'any' turns the entire list into a NOP. 2137 * 'not any' never matches, so it is removed from the 2138 * list unless it is the only item, in which case we 2139 * report an error. 2140 */ 2141 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2142 if (av == NULL && len == 0) /* only this entry */ 2143 errx(EX_DATAERR, "not any never matches"); 2144 } 2145 /* else do nothing and skip this entry */ 2146 return; 2147 } 2148 /* A single IP can be stored in an optimized format */ 2149 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2150 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2151 return; 2152 } 2153 len += 2; /* two words... */ 2154 d += 2; 2155 } /* end while */ 2156 if (len + 1 > F_LEN_MASK) 2157 errx(EX_DATAERR, "address list too long"); 2158 cmd->o.len |= len+1; 2159} 2160 2161 2162/* n2mask sets n bits of the mask */ 2163void 2164n2mask(struct in6_addr *mask, int n) 2165{ 2166 static int minimask[9] = 2167 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2168 u_char *p; 2169 2170 memset(mask, 0, sizeof(struct in6_addr)); 2171 p = (u_char *) mask; 2172 for (; n > 0; p++, n -= 8) { 2173 if (n >= 8) 2174 *p = 0xff; 2175 else 2176 *p = minimask[n]; 2177 } 2178 return; 2179} 2180 2181 2182/* 2183 * helper function to process a set of flags and set bits in the 2184 * appropriate masks. 2185 */ 2186static void 2187fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2188 struct _s_x *flags, char *p) 2189{ 2190 uint8_t set=0, clear=0; 2191 2192 while (p && *p) { 2193 char *q; /* points to the separator */ 2194 int val; 2195 uint8_t *which; /* mask we are working on */ 2196 2197 if (*p == '!') { 2198 p++; 2199 which = &clear; 2200 } else 2201 which = &set; 2202 q = strchr(p, ','); 2203 if (q) 2204 *q++ = '\0'; 2205 val = match_token(flags, p); 2206 if (val <= 0) 2207 errx(EX_DATAERR, "invalid flag %s", p); 2208 *which |= (uint8_t)val; 2209 p = q; 2210 } 2211 cmd->opcode = opcode; 2212 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2213 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2214} 2215 2216 2217void 2218ipfw_delete(char *av[]) 2219{ 2220 uint32_t rulenum; 2221 int i; 2222 int exitval = EX_OK; 2223 int do_set = 0; 2224 2225 av++; 2226 NEED1("missing rule specification"); 2227 if ( *av && _substrcmp(*av, "set") == 0) { 2228 /* Do not allow using the following syntax: 2229 * ipfw set N delete set M 2230 */ 2231 if (co.use_set) 2232 errx(EX_DATAERR, "invalid syntax"); 2233 do_set = 1; /* delete set */ 2234 av++; 2235 } 2236 2237 /* Rule number */ 2238 while (*av && isdigit(**av)) { 2239 i = atoi(*av); av++; 2240 if (co.do_nat) { 2241 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2242 if (exitval) { 2243 exitval = EX_UNAVAILABLE; 2244 warn("rule %u not available", i); 2245 } 2246 } else if (co.do_pipe) { 2247 exitval = ipfw_delete_pipe(co.do_pipe, i); 2248 } else { 2249 if (co.use_set) 2250 rulenum = (i & 0xffff) | (5 << 24) | 2251 ((co.use_set - 1) << 16); 2252 else 2253 rulenum = (i & 0xffff) | (do_set << 24); 2254 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2255 if (i) { 2256 exitval = EX_UNAVAILABLE; 2257 warn("rule %u: setsockopt(IP_FW_DEL)", 2258 rulenum); 2259 } 2260 } 2261 } 2262 if (exitval != EX_OK) 2263 exit(exitval); 2264} 2265 2266 2267/* 2268 * fill the interface structure. We do not check the name as we can 2269 * create interfaces dynamically, so checking them at insert time 2270 * makes relatively little sense. 2271 * Interface names containing '*', '?', or '[' are assumed to be shell 2272 * patterns which match interfaces. 2273 */ 2274static void 2275fill_iface(ipfw_insn_if *cmd, char *arg) 2276{ 2277 cmd->name[0] = '\0'; 2278 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2279 2280 /* Parse the interface or address */ 2281 if (strcmp(arg, "any") == 0) 2282 cmd->o.len = 0; /* effectively ignore this command */ 2283 else if (!isdigit(*arg)) { 2284 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2285 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2286 } else if (!inet_aton(arg, &cmd->p.ip)) 2287 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2288} 2289 2290static void 2291get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2292{ 2293 int i; 2294 size_t l; 2295 char *ap, *ptr, *optr; 2296 struct ether_addr *mac; 2297 const char *macset = "0123456789abcdefABCDEF:"; 2298 2299 if (strcmp(p, "any") == 0) { 2300 for (i = 0; i < ETHER_ADDR_LEN; i++) 2301 addr[i] = mask[i] = 0; 2302 return; 2303 } 2304 2305 optr = ptr = strdup(p); 2306 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2307 l = strlen(ap); 2308 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2309 errx(EX_DATAERR, "Incorrect MAC address"); 2310 bcopy(mac, addr, ETHER_ADDR_LEN); 2311 } else 2312 errx(EX_DATAERR, "Incorrect MAC address"); 2313 2314 if (ptr != NULL) { /* we have mask? */ 2315 if (p[ptr - optr - 1] == '/') { /* mask len */ 2316 long ml = strtol(ptr, &ap, 10); 2317 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 2318 errx(EX_DATAERR, "Incorrect mask length"); 2319 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 2320 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 2321 } else { /* mask */ 2322 l = strlen(ptr); 2323 if (strspn(ptr, macset) != l || 2324 (mac = ether_aton(ptr)) == NULL) 2325 errx(EX_DATAERR, "Incorrect mask"); 2326 bcopy(mac, mask, ETHER_ADDR_LEN); 2327 } 2328 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2329 for (i = 0; i < ETHER_ADDR_LEN; i++) 2330 mask[i] = 0xff; 2331 } 2332 for (i = 0; i < ETHER_ADDR_LEN; i++) 2333 addr[i] &= mask[i]; 2334 2335 free(optr); 2336} 2337 2338/* 2339 * helper function, updates the pointer to cmd with the length 2340 * of the current command, and also cleans up the first word of 2341 * the new command in case it has been clobbered before. 2342 */ 2343static ipfw_insn * 2344next_cmd(ipfw_insn *cmd) 2345{ 2346 cmd += F_LEN(cmd); 2347 bzero(cmd, sizeof(*cmd)); 2348 return cmd; 2349} 2350 2351/* 2352 * Takes arguments and copies them into a comment 2353 */ 2354static void 2355fill_comment(ipfw_insn *cmd, char **av) 2356{ 2357 int i, l; 2358 char *p = (char *)(cmd + 1); 2359 2360 cmd->opcode = O_NOP; 2361 cmd->len = (cmd->len & (F_NOT | F_OR)); 2362 2363 /* Compute length of comment string. */ 2364 for (i = 0, l = 0; av[i] != NULL; i++) 2365 l += strlen(av[i]) + 1; 2366 if (l == 0) 2367 return; 2368 if (l > 84) 2369 errx(EX_DATAERR, 2370 "comment too long (max 80 chars)"); 2371 l = 1 + (l+3)/4; 2372 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2373 for (i = 0; av[i] != NULL; i++) { 2374 strcpy(p, av[i]); 2375 p += strlen(av[i]); 2376 *p++ = ' '; 2377 } 2378 *(--p) = '\0'; 2379} 2380 2381/* 2382 * A function to fill simple commands of size 1. 2383 * Existing flags are preserved. 2384 */ 2385static void 2386fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2387{ 2388 cmd->opcode = opcode; 2389 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2390 cmd->arg1 = arg; 2391} 2392 2393/* 2394 * Fetch and add the MAC address and type, with masks. This generates one or 2395 * two microinstructions, and returns the pointer to the last one. 2396 */ 2397static ipfw_insn * 2398add_mac(ipfw_insn *cmd, char *av[]) 2399{ 2400 ipfw_insn_mac *mac; 2401 2402 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 2403 errx(EX_DATAERR, "MAC dst src"); 2404 2405 cmd->opcode = O_MACADDR2; 2406 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2407 2408 mac = (ipfw_insn_mac *)cmd; 2409 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2410 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2411 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2412 return cmd; 2413} 2414 2415static ipfw_insn * 2416add_mactype(ipfw_insn *cmd, char *av) 2417{ 2418 if (!av) 2419 errx(EX_DATAERR, "missing MAC type"); 2420 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2421 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2422 cmd->opcode = O_MAC_TYPE; 2423 return cmd; 2424 } else 2425 return NULL; 2426} 2427 2428static ipfw_insn * 2429add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2430{ 2431 struct protoent *pe; 2432 char *ep; 2433 int proto; 2434 2435 proto = strtol(av, &ep, 10); 2436 if (*ep != '\0' || proto <= 0) { 2437 if ((pe = getprotobyname(av)) == NULL) 2438 return NULL; 2439 proto = pe->p_proto; 2440 } 2441 2442 fill_cmd(cmd, O_PROTO, 0, proto); 2443 *protop = proto; 2444 return cmd; 2445} 2446 2447static ipfw_insn * 2448add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2449{ 2450 u_char proto = IPPROTO_IP; 2451 2452 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2453 ; /* do not set O_IP4 nor O_IP6 */ 2454 else if (strcmp(av, "ip4") == 0) 2455 /* explicit "just IPv4" rule */ 2456 fill_cmd(cmd, O_IP4, 0, 0); 2457 else if (strcmp(av, "ip6") == 0) { 2458 /* explicit "just IPv6" rule */ 2459 proto = IPPROTO_IPV6; 2460 fill_cmd(cmd, O_IP6, 0, 0); 2461 } else 2462 return add_proto0(cmd, av, protop); 2463 2464 *protop = proto; 2465 return cmd; 2466} 2467 2468static ipfw_insn * 2469add_proto_compat(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, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2476 /* explicit "just IPv4" rule */ 2477 fill_cmd(cmd, O_IP4, 0, 0); 2478 else if (strcmp(av, "ipv6") == 0 || 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_srcip(ipfw_insn *cmd, char *av) 2491{ 2492 fill_ip((ipfw_insn_ip *)cmd, av); 2493 if (cmd->opcode == O_IP_DST_SET) /* set */ 2494 cmd->opcode = O_IP_SRC_SET; 2495 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2496 cmd->opcode = O_IP_SRC_LOOKUP; 2497 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2498 cmd->opcode = O_IP_SRC_ME; 2499 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2500 cmd->opcode = O_IP_SRC; 2501 else /* addr/mask */ 2502 cmd->opcode = O_IP_SRC_MASK; 2503 return cmd; 2504} 2505 2506static ipfw_insn * 2507add_dstip(ipfw_insn *cmd, char *av) 2508{ 2509 fill_ip((ipfw_insn_ip *)cmd, av); 2510 if (cmd->opcode == O_IP_DST_SET) /* set */ 2511 ; 2512 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2513 ; 2514 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2515 cmd->opcode = O_IP_DST_ME; 2516 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2517 cmd->opcode = O_IP_DST; 2518 else /* addr/mask */ 2519 cmd->opcode = O_IP_DST_MASK; 2520 return cmd; 2521} 2522 2523static ipfw_insn * 2524add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2525{ 2526 /* XXX "any" is trapped before. Perhaps "to" */ 2527 if (_substrcmp(av, "any") == 0) { 2528 return NULL; 2529 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2530 /* XXX todo: check that we have a protocol with ports */ 2531 cmd->opcode = opcode; 2532 return cmd; 2533 } 2534 return NULL; 2535} 2536 2537static ipfw_insn * 2538add_src(ipfw_insn *cmd, char *av, u_char proto) 2539{ 2540 struct in6_addr a; 2541 char *host, *ch; 2542 ipfw_insn *ret = NULL; 2543 2544 if ((host = strdup(av)) == NULL) 2545 return NULL; 2546 if ((ch = strrchr(host, '/')) != NULL) 2547 *ch = '\0'; 2548 2549 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2550 inet_pton(AF_INET6, host, &a) == 1) 2551 ret = add_srcip6(cmd, av); 2552 /* XXX: should check for IPv4, not !IPv6 */ 2553 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2554 inet_pton(AF_INET6, host, &a) != 1)) 2555 ret = add_srcip(cmd, av); 2556 if (ret == NULL && strcmp(av, "any") != 0) 2557 ret = cmd; 2558 2559 free(host); 2560 return ret; 2561} 2562 2563static ipfw_insn * 2564add_dst(ipfw_insn *cmd, char *av, u_char proto) 2565{ 2566 struct in6_addr a; 2567 char *host, *ch; 2568 ipfw_insn *ret = NULL; 2569 2570 if ((host = strdup(av)) == NULL) 2571 return NULL; 2572 if ((ch = strrchr(host, '/')) != NULL) 2573 *ch = '\0'; 2574 2575 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2576 inet_pton(AF_INET6, host, &a) == 1) 2577 ret = add_dstip6(cmd, av); 2578 /* XXX: should check for IPv4, not !IPv6 */ 2579 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2580 inet_pton(AF_INET6, host, &a) != 1)) 2581 ret = add_dstip(cmd, av); 2582 if (ret == NULL && strcmp(av, "any") != 0) 2583 ret = cmd; 2584 2585 free(host); 2586 return ret; 2587} 2588 2589/* 2590 * Parse arguments and assemble the microinstructions which make up a rule. 2591 * Rules are added into the 'rulebuf' and then copied in the correct order 2592 * into the actual rule. 2593 * 2594 * The syntax for a rule starts with the action, followed by 2595 * optional action parameters, and the various match patterns. 2596 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2597 * (generated if the rule includes a keep-state option), then the 2598 * various match patterns, log/altq actions, and the actual action. 2599 * 2600 */ 2601void 2602ipfw_add(char *av[]) 2603{ 2604 /* 2605 * rules are added into the 'rulebuf' and then copied in 2606 * the correct order into the actual rule. 2607 * Some things that need to go out of order (prob, action etc.) 2608 * go into actbuf[]. 2609 */ 2610 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2611 2612 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2613 ipfw_insn *first_cmd; /* first match pattern */ 2614 2615 struct ip_fw *rule; 2616 2617 /* 2618 * various flags used to record that we entered some fields. 2619 */ 2620 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2621 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2622 size_t len; 2623 2624 int i; 2625 2626 int open_par = 0; /* open parenthesis ( */ 2627 2628 /* proto is here because it is used to fetch ports */ 2629 u_char proto = IPPROTO_IP; /* default protocol */ 2630 2631 double match_prob = 1; /* match probability, default is always match */ 2632 2633 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2634 bzero(cmdbuf, sizeof(cmdbuf)); 2635 bzero(rulebuf, sizeof(rulebuf)); 2636 2637 rule = (struct ip_fw *)rulebuf; 2638 cmd = (ipfw_insn *)cmdbuf; 2639 action = (ipfw_insn *)actbuf; 2640 2641 av++; 2642 2643 /* [rule N] -- Rule number optional */ 2644 if (av[0] && isdigit(**av)) { 2645 rule->rulenum = atoi(*av); 2646 av++; 2647 } 2648 2649 /* [set N] -- set number (0..RESVD_SET), optional */ 2650 if (av[0] && !av[1] && _substrcmp(*av, "set") == 0) { 2651 int set = strtoul(av[1], NULL, 10); 2652 if (set < 0 || set > RESVD_SET) 2653 errx(EX_DATAERR, "illegal set %s", av[1]); 2654 rule->set = set; 2655 av += 2; 2656 } 2657 2658 /* [prob D] -- match probability, optional */ 2659 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 2660 match_prob = strtod(av[1], NULL); 2661 2662 if (match_prob <= 0 || match_prob > 1) 2663 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2664 av += 2; 2665 } 2666 2667 /* action -- mandatory */ 2668 NEED1("missing action"); 2669 i = match_token(rule_actions, *av); 2670 av++; 2671 action->len = 1; /* default */ 2672 switch(i) { 2673 case TOK_CHECKSTATE: 2674 have_state = action; 2675 action->opcode = O_CHECK_STATE; 2676 break; 2677 2678 case TOK_ACCEPT: 2679 action->opcode = O_ACCEPT; 2680 break; 2681 2682 case TOK_DENY: 2683 action->opcode = O_DENY; 2684 action->arg1 = 0; 2685 break; 2686 2687 case TOK_REJECT: 2688 action->opcode = O_REJECT; 2689 action->arg1 = ICMP_UNREACH_HOST; 2690 break; 2691 2692 case TOK_RESET: 2693 action->opcode = O_REJECT; 2694 action->arg1 = ICMP_REJECT_RST; 2695 break; 2696 2697 case TOK_RESET6: 2698 action->opcode = O_UNREACH6; 2699 action->arg1 = ICMP6_UNREACH_RST; 2700 break; 2701 2702 case TOK_UNREACH: 2703 action->opcode = O_REJECT; 2704 NEED1("missing reject code"); 2705 fill_reject_code(&action->arg1, *av); 2706 av++; 2707 break; 2708 2709 case TOK_UNREACH6: 2710 action->opcode = O_UNREACH6; 2711 NEED1("missing unreach code"); 2712 fill_unreach6_code(&action->arg1, *av); 2713 av++; 2714 break; 2715 2716 case TOK_COUNT: 2717 action->opcode = O_COUNT; 2718 break; 2719 2720 case TOK_NAT: 2721 action->opcode = O_NAT; 2722 action->len = F_INSN_SIZE(ipfw_insn_nat); 2723 goto chkarg; 2724 2725 case TOK_QUEUE: 2726 action->opcode = O_QUEUE; 2727 goto chkarg; 2728 case TOK_PIPE: 2729 action->opcode = O_PIPE; 2730 goto chkarg; 2731 case TOK_SKIPTO: 2732 action->opcode = O_SKIPTO; 2733 goto chkarg; 2734 case TOK_NETGRAPH: 2735 action->opcode = O_NETGRAPH; 2736 goto chkarg; 2737 case TOK_NGTEE: 2738 action->opcode = O_NGTEE; 2739 goto chkarg; 2740 case TOK_DIVERT: 2741 action->opcode = O_DIVERT; 2742 goto chkarg; 2743 case TOK_TEE: 2744 action->opcode = O_TEE; 2745chkarg: 2746 if (!av[0]) 2747 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2748 if (isdigit(**av)) { 2749 action->arg1 = strtoul(*av, NULL, 10); 2750 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2751 errx(EX_DATAERR, "illegal argument for %s", 2752 *(av - 1)); 2753 } else if (_substrcmp(*av, "tablearg") == 0) { 2754 action->arg1 = IP_FW_TABLEARG; 2755 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2756 struct servent *s; 2757 setservent(1); 2758 s = getservbyname(av[0], "divert"); 2759 if (s != NULL) 2760 action->arg1 = ntohs(s->s_port); 2761 else 2762 errx(EX_DATAERR, "illegal divert/tee port"); 2763 } else 2764 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2765 av++; 2766 break; 2767 2768 case TOK_FORWARD: { 2769 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2770 char *s, *end; 2771 2772 NEED1("missing forward address[:port]"); 2773 2774 action->opcode = O_FORWARD_IP; 2775 action->len = F_INSN_SIZE(ipfw_insn_sa); 2776 2777 /* 2778 * In the kernel we assume AF_INET and use only 2779 * sin_port and sin_addr. Remember to set sin_len as 2780 * the routing code seems to use it too. 2781 */ 2782 p->sa.sin_family = AF_INET; 2783 p->sa.sin_len = sizeof(struct sockaddr_in); 2784 p->sa.sin_port = 0; 2785 /* 2786 * locate the address-port separator (':' or ',') 2787 */ 2788 s = strchr(*av, ':'); 2789 if (s == NULL) 2790 s = strchr(*av, ','); 2791 if (s != NULL) { 2792 *(s++) = '\0'; 2793 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2794 if (s == end) 2795 errx(EX_DATAERR, 2796 "illegal forwarding port ``%s''", s); 2797 p->sa.sin_port = (u_short)i; 2798 } 2799 if (_substrcmp(*av, "tablearg") == 0) 2800 p->sa.sin_addr.s_addr = INADDR_ANY; 2801 else 2802 lookup_host(*av, &(p->sa.sin_addr)); 2803 av++; 2804 break; 2805 } 2806 case TOK_COMMENT: 2807 /* pretend it is a 'count' rule followed by the comment */ 2808 action->opcode = O_COUNT; 2809 av--; /* go back... */ 2810 break; 2811 2812 case TOK_SETFIB: 2813 { 2814 int numfibs; 2815 size_t intsize = sizeof(int); 2816 2817 action->opcode = O_SETFIB; 2818 NEED1("missing fib number"); 2819 action->arg1 = strtoul(*av, NULL, 10); 2820 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2821 errx(EX_DATAERR, "fibs not suported.\n"); 2822 if (action->arg1 >= numfibs) /* Temporary */ 2823 errx(EX_DATAERR, "fib too large.\n"); 2824 av++; 2825 break; 2826 } 2827 2828 case TOK_REASS: 2829 action->opcode = O_REASS; 2830 break; 2831 2832 default: 2833 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2834 } 2835 action = next_cmd(action); 2836 2837 /* 2838 * [altq queuename] -- altq tag, optional 2839 * [log [logamount N]] -- log, optional 2840 * 2841 * If they exist, it go first in the cmdbuf, but then it is 2842 * skipped in the copy section to the end of the buffer. 2843 */ 2844 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 2845 av++; 2846 switch (i) { 2847 case TOK_LOG: 2848 { 2849 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2850 int l; 2851 2852 if (have_log) 2853 errx(EX_DATAERR, 2854 "log cannot be specified more than once"); 2855 have_log = (ipfw_insn *)c; 2856 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2857 cmd->opcode = O_LOG; 2858 if (av[0] && _substrcmp(*av, "logamount") == 0) { 2859 av++; 2860 NEED1("logamount requires argument"); 2861 l = atoi(*av); 2862 if (l < 0) 2863 errx(EX_DATAERR, 2864 "logamount must be positive"); 2865 c->max_log = l; 2866 av++; 2867 } else { 2868 len = sizeof(c->max_log); 2869 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2870 &c->max_log, &len, NULL, 0) == -1) 2871 errx(1, "sysctlbyname(\"%s\")", 2872 "net.inet.ip.fw.verbose_limit"); 2873 } 2874 } 2875 break; 2876 2877#ifndef NO_ALTQ 2878 case TOK_ALTQ: 2879 { 2880 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2881 2882 NEED1("missing altq queue name"); 2883 if (have_altq) 2884 errx(EX_DATAERR, 2885 "altq cannot be specified more than once"); 2886 have_altq = (ipfw_insn *)a; 2887 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2888 cmd->opcode = O_ALTQ; 2889 a->qid = altq_name_to_qid(*av); 2890 av++; 2891 } 2892 break; 2893#endif 2894 2895 case TOK_TAG: 2896 case TOK_UNTAG: { 2897 uint16_t tag; 2898 2899 if (have_tag) 2900 errx(EX_USAGE, "tag and untag cannot be " 2901 "specified more than once"); 2902 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 2903 rule_action_params); 2904 have_tag = cmd; 2905 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2906 av++; 2907 break; 2908 } 2909 2910 default: 2911 abort(); 2912 } 2913 cmd = next_cmd(cmd); 2914 } 2915 2916 if (have_state) /* must be a check-state, we are done */ 2917 goto done; 2918 2919#define OR_START(target) \ 2920 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 2921 if (open_par) \ 2922 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2923 prev = NULL; \ 2924 open_par = 1; \ 2925 if ( (av[0])[1] == '\0') { \ 2926 av++; \ 2927 } else \ 2928 (*av)++; \ 2929 } \ 2930 target: \ 2931 2932 2933#define CLOSE_PAR \ 2934 if (open_par) { \ 2935 if (av[0] && ( \ 2936 strcmp(*av, ")") == 0 || \ 2937 strcmp(*av, "}") == 0)) { \ 2938 prev = NULL; \ 2939 open_par = 0; \ 2940 av++; \ 2941 } else \ 2942 errx(EX_USAGE, "missing \")\"\n"); \ 2943 } 2944 2945#define NOT_BLOCK \ 2946 if (av[0] && _substrcmp(*av, "not") == 0) { \ 2947 if (cmd->len & F_NOT) \ 2948 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2949 cmd->len |= F_NOT; \ 2950 av++; \ 2951 } 2952 2953#define OR_BLOCK(target) \ 2954 if (av[0] && _substrcmp(*av, "or") == 0) { \ 2955 if (prev == NULL || open_par == 0) \ 2956 errx(EX_DATAERR, "invalid OR block"); \ 2957 prev->len |= F_OR; \ 2958 av++; \ 2959 goto target; \ 2960 } \ 2961 CLOSE_PAR; 2962 2963 first_cmd = cmd; 2964 2965#if 0 2966 /* 2967 * MAC addresses, optional. 2968 * If we have this, we skip the part "proto from src to dst" 2969 * and jump straight to the option parsing. 2970 */ 2971 NOT_BLOCK; 2972 NEED1("missing protocol"); 2973 if (_substrcmp(*av, "MAC") == 0 || 2974 _substrcmp(*av, "mac") == 0) { 2975 av++; /* the "MAC" keyword */ 2976 add_mac(cmd, av); /* exits in case of errors */ 2977 cmd = next_cmd(cmd); 2978 av += 2; /* dst-mac and src-mac */ 2979 NOT_BLOCK; 2980 NEED1("missing mac type"); 2981 if (add_mactype(cmd, av[0])) 2982 cmd = next_cmd(cmd); 2983 av++; /* any or mac-type */ 2984 goto read_options; 2985 } 2986#endif 2987 2988 /* 2989 * protocol, mandatory 2990 */ 2991 OR_START(get_proto); 2992 NOT_BLOCK; 2993 NEED1("missing protocol"); 2994 if (add_proto_compat(cmd, *av, &proto)) { 2995 av++; 2996 if (F_LEN(cmd) != 0) { 2997 prev = cmd; 2998 cmd = next_cmd(cmd); 2999 } 3000 } else if (first_cmd != cmd) { 3001 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3002 } else 3003 goto read_options; 3004 OR_BLOCK(get_proto); 3005 3006 /* 3007 * "from", mandatory 3008 */ 3009 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3010 errx(EX_USAGE, "missing ``from''"); 3011 av++; 3012 3013 /* 3014 * source IP, mandatory 3015 */ 3016 OR_START(source_ip); 3017 NOT_BLOCK; /* optional "not" */ 3018 NEED1("missing source address"); 3019 if (add_src(cmd, *av, proto)) { 3020 av++; 3021 if (F_LEN(cmd) != 0) { /* ! any */ 3022 prev = cmd; 3023 cmd = next_cmd(cmd); 3024 } 3025 } else 3026 errx(EX_USAGE, "bad source address %s", *av); 3027 OR_BLOCK(source_ip); 3028 3029 /* 3030 * source ports, optional 3031 */ 3032 NOT_BLOCK; /* optional "not" */ 3033 if ( av[0] != NULL ) { 3034 if (_substrcmp(*av, "any") == 0 || 3035 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3036 av++; 3037 if (F_LEN(cmd) != 0) 3038 cmd = next_cmd(cmd); 3039 } 3040 } 3041 3042 /* 3043 * "to", mandatory 3044 */ 3045 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 3046 errx(EX_USAGE, "missing ``to''"); 3047 av++; 3048 3049 /* 3050 * destination, mandatory 3051 */ 3052 OR_START(dest_ip); 3053 NOT_BLOCK; /* optional "not" */ 3054 NEED1("missing dst address"); 3055 if (add_dst(cmd, *av, proto)) { 3056 av++; 3057 if (F_LEN(cmd) != 0) { /* ! any */ 3058 prev = cmd; 3059 cmd = next_cmd(cmd); 3060 } 3061 } else 3062 errx( EX_USAGE, "bad destination address %s", *av); 3063 OR_BLOCK(dest_ip); 3064 3065 /* 3066 * dest. ports, optional 3067 */ 3068 NOT_BLOCK; /* optional "not" */ 3069 if (av[0]) { 3070 if (_substrcmp(*av, "any") == 0 || 3071 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3072 av++; 3073 if (F_LEN(cmd) != 0) 3074 cmd = next_cmd(cmd); 3075 } 3076 } 3077 3078read_options: 3079 if (av[0] && first_cmd == cmd) { 3080 /* 3081 * nothing specified so far, store in the rule to ease 3082 * printout later. 3083 */ 3084 rule->_pad = 1; 3085 } 3086 prev = NULL; 3087 while ( av[0] != NULL ) { 3088 char *s; 3089 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3090 3091 s = *av; 3092 cmd32 = (ipfw_insn_u32 *)cmd; 3093 3094 if (*s == '!') { /* alternate syntax for NOT */ 3095 if (cmd->len & F_NOT) 3096 errx(EX_USAGE, "double \"not\" not allowed\n"); 3097 cmd->len = F_NOT; 3098 s++; 3099 } 3100 i = match_token(rule_options, s); 3101 av++; 3102 switch(i) { 3103 case TOK_NOT: 3104 if (cmd->len & F_NOT) 3105 errx(EX_USAGE, "double \"not\" not allowed\n"); 3106 cmd->len = F_NOT; 3107 break; 3108 3109 case TOK_OR: 3110 if (open_par == 0 || prev == NULL) 3111 errx(EX_USAGE, "invalid \"or\" block\n"); 3112 prev->len |= F_OR; 3113 break; 3114 3115 case TOK_STARTBRACE: 3116 if (open_par) 3117 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3118 open_par = 1; 3119 break; 3120 3121 case TOK_ENDBRACE: 3122 if (!open_par) 3123 errx(EX_USAGE, "+missing \")\"\n"); 3124 open_par = 0; 3125 prev = NULL; 3126 break; 3127 3128 case TOK_IN: 3129 fill_cmd(cmd, O_IN, 0, 0); 3130 break; 3131 3132 case TOK_OUT: 3133 cmd->len ^= F_NOT; /* toggle F_NOT */ 3134 fill_cmd(cmd, O_IN, 0, 0); 3135 break; 3136 3137 case TOK_DIVERTED: 3138 fill_cmd(cmd, O_DIVERTED, 0, 3); 3139 break; 3140 3141 case TOK_DIVERTEDLOOPBACK: 3142 fill_cmd(cmd, O_DIVERTED, 0, 1); 3143 break; 3144 3145 case TOK_DIVERTEDOUTPUT: 3146 fill_cmd(cmd, O_DIVERTED, 0, 2); 3147 break; 3148 3149 case TOK_FRAG: 3150 fill_cmd(cmd, O_FRAG, 0, 0); 3151 break; 3152 3153 case TOK_LAYER2: 3154 fill_cmd(cmd, O_LAYER2, 0, 0); 3155 break; 3156 3157 case TOK_XMIT: 3158 case TOK_RECV: 3159 case TOK_VIA: 3160 NEED1("recv, xmit, via require interface name" 3161 " or address"); 3162 fill_iface((ipfw_insn_if *)cmd, av[0]); 3163 av++; 3164 if (F_LEN(cmd) == 0) /* not a valid address */ 3165 break; 3166 if (i == TOK_XMIT) 3167 cmd->opcode = O_XMIT; 3168 else if (i == TOK_RECV) 3169 cmd->opcode = O_RECV; 3170 else if (i == TOK_VIA) 3171 cmd->opcode = O_VIA; 3172 break; 3173 3174 case TOK_ICMPTYPES: 3175 NEED1("icmptypes requires list of types"); 3176 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3177 av++; 3178 break; 3179 3180 case TOK_ICMP6TYPES: 3181 NEED1("icmptypes requires list of types"); 3182 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3183 av++; 3184 break; 3185 3186 case TOK_IPTTL: 3187 NEED1("ipttl requires TTL"); 3188 if (strpbrk(*av, "-,")) { 3189 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3190 errx(EX_DATAERR, "invalid ipttl %s", *av); 3191 } else 3192 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3193 av++; 3194 break; 3195 3196 case TOK_IPID: 3197 NEED1("ipid requires id"); 3198 if (strpbrk(*av, "-,")) { 3199 if (!add_ports(cmd, *av, 0, O_IPID)) 3200 errx(EX_DATAERR, "invalid ipid %s", *av); 3201 } else 3202 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3203 av++; 3204 break; 3205 3206 case TOK_IPLEN: 3207 NEED1("iplen requires length"); 3208 if (strpbrk(*av, "-,")) { 3209 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3210 errx(EX_DATAERR, "invalid ip len %s", *av); 3211 } else 3212 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3213 av++; 3214 break; 3215 3216 case TOK_IPVER: 3217 NEED1("ipver requires version"); 3218 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3219 av++; 3220 break; 3221 3222 case TOK_IPPRECEDENCE: 3223 NEED1("ipprecedence requires value"); 3224 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3225 (strtoul(*av, NULL, 0) & 7) << 5); 3226 av++; 3227 break; 3228 3229 case TOK_IPOPTS: 3230 NEED1("missing argument for ipoptions"); 3231 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3232 av++; 3233 break; 3234 3235 case TOK_IPTOS: 3236 NEED1("missing argument for iptos"); 3237 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3238 av++; 3239 break; 3240 3241 case TOK_UID: 3242 NEED1("uid requires argument"); 3243 { 3244 char *end; 3245 uid_t uid; 3246 struct passwd *pwd; 3247 3248 cmd->opcode = O_UID; 3249 uid = strtoul(*av, &end, 0); 3250 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3251 if (pwd == NULL) 3252 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3253 cmd32->d[0] = pwd->pw_uid; 3254 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3255 av++; 3256 } 3257 break; 3258 3259 case TOK_GID: 3260 NEED1("gid requires argument"); 3261 { 3262 char *end; 3263 gid_t gid; 3264 struct group *grp; 3265 3266 cmd->opcode = O_GID; 3267 gid = strtoul(*av, &end, 0); 3268 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3269 if (grp == NULL) 3270 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3271 cmd32->d[0] = grp->gr_gid; 3272 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3273 av++; 3274 } 3275 break; 3276 3277 case TOK_JAIL: 3278 NEED1("jail requires argument"); 3279 { 3280 char *end; 3281 int jid; 3282 3283 cmd->opcode = O_JAIL; 3284 jid = (int)strtol(*av, &end, 0); 3285 if (jid < 0 || *end != '\0') 3286 errx(EX_DATAERR, "jail requires prison ID"); 3287 cmd32->d[0] = (uint32_t)jid; 3288 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3289 av++; 3290 } 3291 break; 3292 3293 case TOK_ESTAB: 3294 fill_cmd(cmd, O_ESTAB, 0, 0); 3295 break; 3296 3297 case TOK_SETUP: 3298 fill_cmd(cmd, O_TCPFLAGS, 0, 3299 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3300 break; 3301 3302 case TOK_TCPDATALEN: 3303 NEED1("tcpdatalen requires length"); 3304 if (strpbrk(*av, "-,")) { 3305 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3306 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3307 } else 3308 fill_cmd(cmd, O_TCPDATALEN, 0, 3309 strtoul(*av, NULL, 0)); 3310 av++; 3311 break; 3312 3313 case TOK_TCPOPTS: 3314 NEED1("missing argument for tcpoptions"); 3315 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3316 av++; 3317 break; 3318 3319 case TOK_TCPSEQ: 3320 case TOK_TCPACK: 3321 NEED1("tcpseq/tcpack requires argument"); 3322 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3323 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3324 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3325 av++; 3326 break; 3327 3328 case TOK_TCPWIN: 3329 NEED1("tcpwin requires length"); 3330 fill_cmd(cmd, O_TCPWIN, 0, 3331 htons(strtoul(*av, NULL, 0))); 3332 av++; 3333 break; 3334 3335 case TOK_TCPFLAGS: 3336 NEED1("missing argument for tcpflags"); 3337 cmd->opcode = O_TCPFLAGS; 3338 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3339 av++; 3340 break; 3341 3342 case TOK_KEEPSTATE: 3343 if (open_par) 3344 errx(EX_USAGE, "keep-state cannot be part " 3345 "of an or block"); 3346 if (have_state) 3347 errx(EX_USAGE, "only one of keep-state " 3348 "and limit is allowed"); 3349 have_state = cmd; 3350 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3351 break; 3352 3353 case TOK_LIMIT: { 3354 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3355 int val; 3356 3357 if (open_par) 3358 errx(EX_USAGE, 3359 "limit cannot be part of an or block"); 3360 if (have_state) 3361 errx(EX_USAGE, "only one of keep-state and " 3362 "limit is allowed"); 3363 have_state = cmd; 3364 3365 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3366 cmd->opcode = O_LIMIT; 3367 c->limit_mask = c->conn_limit = 0; 3368 3369 while ( av[0] != NULL ) { 3370 if ((val = match_token(limit_masks, *av)) <= 0) 3371 break; 3372 c->limit_mask |= val; 3373 av++; 3374 } 3375 3376 if (c->limit_mask == 0) 3377 errx(EX_USAGE, "limit: missing limit mask"); 3378 3379 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3380 TOK_LIMIT, rule_options); 3381 3382 av++; 3383 break; 3384 } 3385 3386 case TOK_PROTO: 3387 NEED1("missing protocol"); 3388 if (add_proto(cmd, *av, &proto)) { 3389 av++; 3390 } else 3391 errx(EX_DATAERR, "invalid protocol ``%s''", 3392 *av); 3393 break; 3394 3395 case TOK_SRCIP: 3396 NEED1("missing source IP"); 3397 if (add_srcip(cmd, *av)) { 3398 av++; 3399 } 3400 break; 3401 3402 case TOK_DSTIP: 3403 NEED1("missing destination IP"); 3404 if (add_dstip(cmd, *av)) { 3405 av++; 3406 } 3407 break; 3408 3409 case TOK_SRCIP6: 3410 NEED1("missing source IP6"); 3411 if (add_srcip6(cmd, *av)) { 3412 av++; 3413 } 3414 break; 3415 3416 case TOK_DSTIP6: 3417 NEED1("missing destination IP6"); 3418 if (add_dstip6(cmd, *av)) { 3419 av++; 3420 } 3421 break; 3422 3423 case TOK_SRCPORT: 3424 NEED1("missing source port"); 3425 if (_substrcmp(*av, "any") == 0 || 3426 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3427 av++; 3428 } else 3429 errx(EX_DATAERR, "invalid source port %s", *av); 3430 break; 3431 3432 case TOK_DSTPORT: 3433 NEED1("missing destination port"); 3434 if (_substrcmp(*av, "any") == 0 || 3435 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3436 av++; 3437 } else 3438 errx(EX_DATAERR, "invalid destination port %s", 3439 *av); 3440 break; 3441 3442 case TOK_MAC: 3443 if (add_mac(cmd, av)) 3444 av += 2; 3445 break; 3446 3447 case TOK_MACTYPE: 3448 NEED1("missing mac type"); 3449 if (!add_mactype(cmd, *av)) 3450 errx(EX_DATAERR, "invalid mac type %s", *av); 3451 av++; 3452 break; 3453 3454 case TOK_VERREVPATH: 3455 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3456 break; 3457 3458 case TOK_VERSRCREACH: 3459 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3460 break; 3461 3462 case TOK_ANTISPOOF: 3463 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3464 break; 3465 3466 case TOK_IPSEC: 3467 fill_cmd(cmd, O_IPSEC, 0, 0); 3468 break; 3469 3470 case TOK_IPV6: 3471 fill_cmd(cmd, O_IP6, 0, 0); 3472 break; 3473 3474 case TOK_IPV4: 3475 fill_cmd(cmd, O_IP4, 0, 0); 3476 break; 3477 3478 case TOK_EXT6HDR: 3479 fill_ext6hdr( cmd, *av ); 3480 av++; 3481 break; 3482 3483 case TOK_FLOWID: 3484 if (proto != IPPROTO_IPV6 ) 3485 errx( EX_USAGE, "flow-id filter is active " 3486 "only for ipv6 protocol\n"); 3487 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3488 av++; 3489 break; 3490 3491 case TOK_COMMENT: 3492 fill_comment(cmd, av); 3493 av[0]=NULL; 3494 break; 3495 3496 case TOK_TAGGED: 3497 if (av[0] && strpbrk(*av, "-,")) { 3498 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3499 errx(EX_DATAERR, "tagged: invalid tag" 3500 " list: %s", *av); 3501 } 3502 else { 3503 uint16_t tag; 3504 3505 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3506 TOK_TAGGED, rule_options); 3507 fill_cmd(cmd, O_TAGGED, 0, tag); 3508 } 3509 av++; 3510 break; 3511 3512 case TOK_FIB: 3513 NEED1("fib requires fib number"); 3514 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3515 av++; 3516 break; 3517 3518 case TOK_LOOKUP: { 3519 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 3520 char *p; 3521 int j; 3522 3523 if (!av[0] || !av[1]) 3524 errx(EX_USAGE, "format: lookup argument tablenum"); 3525 cmd->opcode = O_IP_DST_LOOKUP; 3526 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 3527 i = match_token(rule_options, *av); 3528 for (j = 0; lookup_key[j] >= 0 ; j++) { 3529 if (i == lookup_key[j]) 3530 break; 3531 } 3532 if (lookup_key[j] <= 0) 3533 errx(EX_USAGE, "format: cannot lookup on %s", *av); 3534 c->d[1] = j; // i converted to option 3535 av++; 3536 cmd->arg1 = strtoul(*av, &p, 0); 3537 if (p && *p) 3538 errx(EX_USAGE, "format: lookup argument tablenum"); 3539 av++; 3540 } 3541 break; 3542 3543 default: 3544 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3545 } 3546 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3547 prev = cmd; 3548 cmd = next_cmd(cmd); 3549 } 3550 } 3551 3552done: 3553 /* 3554 * Now copy stuff into the rule. 3555 * If we have a keep-state option, the first instruction 3556 * must be a PROBE_STATE (which is generated here). 3557 * If we have a LOG option, it was stored as the first command, 3558 * and now must be moved to the top of the action part. 3559 */ 3560 dst = (ipfw_insn *)rule->cmd; 3561 3562 /* 3563 * First thing to write into the command stream is the match probability. 3564 */ 3565 if (match_prob != 1) { /* 1 means always match */ 3566 dst->opcode = O_PROB; 3567 dst->len = 2; 3568 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3569 dst += dst->len; 3570 } 3571 3572 /* 3573 * generate O_PROBE_STATE if necessary 3574 */ 3575 if (have_state && have_state->opcode != O_CHECK_STATE) { 3576 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3577 dst = next_cmd(dst); 3578 } 3579 3580 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3581 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3582 i = F_LEN(src); 3583 3584 switch (src->opcode) { 3585 case O_LOG: 3586 case O_KEEP_STATE: 3587 case O_LIMIT: 3588 case O_ALTQ: 3589 case O_TAG: 3590 break; 3591 default: 3592 bcopy(src, dst, i * sizeof(uint32_t)); 3593 dst += i; 3594 } 3595 } 3596 3597 /* 3598 * put back the have_state command as last opcode 3599 */ 3600 if (have_state && have_state->opcode != O_CHECK_STATE) { 3601 i = F_LEN(have_state); 3602 bcopy(have_state, dst, i * sizeof(uint32_t)); 3603 dst += i; 3604 } 3605 /* 3606 * start action section 3607 */ 3608 rule->act_ofs = dst - rule->cmd; 3609 3610 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3611 if (have_log) { 3612 i = F_LEN(have_log); 3613 bcopy(have_log, dst, i * sizeof(uint32_t)); 3614 dst += i; 3615 } 3616 if (have_altq) { 3617 i = F_LEN(have_altq); 3618 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3619 dst += i; 3620 } 3621 if (have_tag) { 3622 i = F_LEN(have_tag); 3623 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3624 dst += i; 3625 } 3626 /* 3627 * copy all other actions 3628 */ 3629 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3630 i = F_LEN(src); 3631 bcopy(src, dst, i * sizeof(uint32_t)); 3632 dst += i; 3633 } 3634 3635 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3636 i = (char *)dst - (char *)rule; 3637 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3638 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3639 if (!co.do_quiet) 3640 show_ipfw(rule, 0, 0); 3641} 3642 3643/* 3644 * clear the counters or the log counters. 3645 */ 3646void 3647ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3648{ 3649 uint32_t arg, saved_arg; 3650 int failed = EX_OK; 3651 char const *errstr; 3652 char const *name = optname ? "RESETLOG" : "ZERO"; 3653 3654 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3655 3656 av++; ac--; 3657 3658 if (!ac) { 3659 /* clear all entries */ 3660 if (do_cmd(optname, NULL, 0) < 0) 3661 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3662 if (!co.do_quiet) 3663 printf("%s.\n", optname == IP_FW_ZERO ? 3664 "Accounting cleared":"Logging counts reset"); 3665 3666 return; 3667 } 3668 3669 while (ac) { 3670 /* Rule number */ 3671 if (isdigit(**av)) { 3672 arg = strtonum(*av, 0, 0xffff, &errstr); 3673 if (errstr) 3674 errx(EX_DATAERR, 3675 "invalid rule number %s\n", *av); 3676 saved_arg = arg; 3677 if (co.use_set) 3678 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3679 av++; 3680 ac--; 3681 if (do_cmd(optname, &arg, sizeof(arg))) { 3682 warn("rule %u: setsockopt(IP_FW_%s)", 3683 saved_arg, name); 3684 failed = EX_UNAVAILABLE; 3685 } else if (!co.do_quiet) 3686 printf("Entry %d %s.\n", saved_arg, 3687 optname == IP_FW_ZERO ? 3688 "cleared" : "logging count reset"); 3689 } else { 3690 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3691 } 3692 } 3693 if (failed != EX_OK) 3694 exit(failed); 3695} 3696 3697void 3698ipfw_flush(int force) 3699{ 3700 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3701 3702 if (!force && !co.do_quiet) { /* need to ask user */ 3703 int c; 3704 3705 printf("Are you sure? [yn] "); 3706 fflush(stdout); 3707 do { 3708 c = toupper(getc(stdin)); 3709 while (c != '\n' && getc(stdin) != '\n') 3710 if (feof(stdin)) 3711 return; /* and do not flush */ 3712 } while (c != 'Y' && c != 'N'); 3713 printf("\n"); 3714 if (c == 'N') /* user said no */ 3715 return; 3716 } 3717 if (co.do_pipe) { 3718 dummynet_flush(); 3719 return; 3720 } 3721 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3722 if (co.use_set) { 3723 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3724 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3725 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3726 } else if (do_cmd(cmd, NULL, 0) < 0) 3727 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3728 co.do_pipe ? "DUMMYNET" : "FW"); 3729 if (!co.do_quiet) 3730 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3731} 3732 3733 3734static void table_list(ipfw_table_entry ent, int need_header); 3735 3736/* 3737 * This one handles all table-related commands 3738 * ipfw table N add addr[/masklen] [value] 3739 * ipfw table N delete addr[/masklen] 3740 * ipfw table {N | all} flush 3741 * ipfw table {N | all} list 3742 */ 3743void 3744ipfw_table_handler(int ac, char *av[]) 3745{ 3746 ipfw_table_entry ent; 3747 int do_add; 3748 int is_all; 3749 size_t len; 3750 char *p; 3751 uint32_t a; 3752 uint32_t tables_max; 3753 3754 len = sizeof(tables_max); 3755 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3756 NULL, 0) == -1) { 3757#ifdef IPFW_TABLES_MAX 3758 warn("Warn: Failed to get the max tables number via sysctl. " 3759 "Using the compiled in defaults. \nThe reason was"); 3760 tables_max = IPFW_TABLES_MAX; 3761#else 3762 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3763#endif 3764 } 3765 3766 ac--; av++; 3767 if (ac && isdigit(**av)) { 3768 ent.tbl = atoi(*av); 3769 is_all = 0; 3770 ac--; av++; 3771 } else if (ac && _substrcmp(*av, "all") == 0) { 3772 ent.tbl = 0; 3773 is_all = 1; 3774 ac--; av++; 3775 } else 3776 errx(EX_USAGE, "table number or 'all' keyword required"); 3777 if (ent.tbl >= tables_max) 3778 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3779 "value (%d)", tables_max - 1); 3780 NEED1("table needs command"); 3781 if (is_all && _substrcmp(*av, "list") != 0 3782 && _substrcmp(*av, "flush") != 0) 3783 errx(EX_USAGE, "table number required"); 3784 3785 if (_substrcmp(*av, "add") == 0 || 3786 _substrcmp(*av, "delete") == 0) { 3787 do_add = **av == 'a'; 3788 ac--; av++; 3789 if (!ac) 3790 errx(EX_USAGE, "IP address required"); 3791 p = strchr(*av, '/'); 3792 if (p) { 3793 *p++ = '\0'; 3794 ent.masklen = atoi(p); 3795 if (ent.masklen > 32) 3796 errx(EX_DATAERR, "bad width ``%s''", p); 3797 } else 3798 ent.masklen = 32; 3799 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3800 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3801 ac--; av++; 3802 if (do_add && ac) { 3803 unsigned int tval; 3804 /* isdigit is a bit of a hack here.. */ 3805 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3806 ent.value = strtoul(*av, NULL, 0); 3807 } else { 3808 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3809 /* The value must be stored in host order * 3810 * so that the values < 65k can be distinguished */ 3811 ent.value = ntohl(tval); 3812 } else { 3813 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3814 } 3815 } 3816 } else 3817 ent.value = 0; 3818 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3819 &ent, sizeof(ent)) < 0) { 3820 /* If running silent, don't bomb out on these errors. */ 3821 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3822 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3823 do_add ? "ADD" : "DEL"); 3824 /* In silent mode, react to a failed add by deleting */ 3825 if (do_add) { 3826 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3827 if (do_cmd(IP_FW_TABLE_ADD, 3828 &ent, sizeof(ent)) < 0) 3829 err(EX_OSERR, 3830 "setsockopt(IP_FW_TABLE_ADD)"); 3831 } 3832 } 3833 } else if (_substrcmp(*av, "flush") == 0) { 3834 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3835 do { 3836 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3837 sizeof(ent.tbl)) < 0) 3838 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3839 } while (++ent.tbl < a); 3840 } else if (_substrcmp(*av, "list") == 0) { 3841 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1); 3842 do { 3843 table_list(ent, is_all); 3844 } while (++ent.tbl < a); 3845 } else 3846 errx(EX_USAGE, "invalid table command %s", *av); 3847} 3848 3849static void 3850table_list(ipfw_table_entry ent, int need_header) 3851{ 3852 ipfw_table *tbl; 3853 socklen_t l; 3854 uint32_t a; 3855 3856 a = ent.tbl; 3857 l = sizeof(a); 3858 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3859 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3860 3861 /* If a is zero we have nothing to do, the table is empty. */ 3862 if (a == 0) 3863 return; 3864 3865 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3866 tbl = safe_calloc(1, l); 3867 tbl->tbl = ent.tbl; 3868 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3869 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3870 if (tbl->cnt && need_header) 3871 printf("---table(%d)---\n", tbl->tbl); 3872 for (a = 0; a < tbl->cnt; a++) { 3873 unsigned int tval; 3874 tval = tbl->ent[a].value; 3875 if (co.do_value_as_ip) { 3876 char tbuf[128]; 3877 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3878 &tbl->ent[a].addr), 127); 3879 /* inet_ntoa expects network order */ 3880 tval = htonl(tval); 3881 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3882 inet_ntoa(*(struct in_addr *)&tval)); 3883 } else { 3884 printf("%s/%u %u\n", 3885 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3886 tbl->ent[a].masklen, tval); 3887 } 3888 } 3889 free(tbl); 3890} 3891