ipfw2.c revision 200183
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 200183 2009-12-06 18:04:26Z 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 (!ac) \ 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 val; \ 69 char *end; \ 70 \ 71 val = strtol(*av, &end, 10); \ 72 \ 73 if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \ 74 errx(EX_DATAERR, "%s: invalid argument: %s", \ 75 match_value(s_x, tok), *av); \ 76 \ 77 if (errno == ERANGE || val < min || val > 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 (val == IP_FW_TABLEARG) \ 82 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 83 match_value(s_x, tok), *av); \ 84 arg = val; \ 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 227static struct _s_x rule_options[] = { 228 { "tagged", TOK_TAGGED }, 229 { "uid", TOK_UID }, 230 { "gid", TOK_GID }, 231 { "jail", TOK_JAIL }, 232 { "in", TOK_IN }, 233 { "limit", TOK_LIMIT }, 234 { "keep-state", TOK_KEEPSTATE }, 235 { "bridged", TOK_LAYER2 }, 236 { "layer2", TOK_LAYER2 }, 237 { "out", TOK_OUT }, 238 { "diverted", TOK_DIVERTED }, 239 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 240 { "diverted-output", TOK_DIVERTEDOUTPUT }, 241 { "xmit", TOK_XMIT }, 242 { "recv", TOK_RECV }, 243 { "via", TOK_VIA }, 244 { "fragment", TOK_FRAG }, 245 { "frag", TOK_FRAG }, 246 { "fib", TOK_FIB }, 247 { "ipoptions", TOK_IPOPTS }, 248 { "ipopts", TOK_IPOPTS }, 249 { "iplen", TOK_IPLEN }, 250 { "ipid", TOK_IPID }, 251 { "ipprecedence", TOK_IPPRECEDENCE }, 252 { "iptos", TOK_IPTOS }, 253 { "ipttl", TOK_IPTTL }, 254 { "ipversion", TOK_IPVER }, 255 { "ipver", TOK_IPVER }, 256 { "estab", TOK_ESTAB }, 257 { "established", TOK_ESTAB }, 258 { "setup", TOK_SETUP }, 259 { "tcpdatalen", TOK_TCPDATALEN }, 260 { "tcpflags", TOK_TCPFLAGS }, 261 { "tcpflgs", TOK_TCPFLAGS }, 262 { "tcpoptions", TOK_TCPOPTS }, 263 { "tcpopts", TOK_TCPOPTS }, 264 { "tcpseq", TOK_TCPSEQ }, 265 { "tcpack", TOK_TCPACK }, 266 { "tcpwin", TOK_TCPWIN }, 267 { "icmptype", TOK_ICMPTYPES }, 268 { "icmptypes", TOK_ICMPTYPES }, 269 { "dst-ip", TOK_DSTIP }, 270 { "src-ip", TOK_SRCIP }, 271 { "dst-port", TOK_DSTPORT }, 272 { "src-port", TOK_SRCPORT }, 273 { "proto", TOK_PROTO }, 274 { "MAC", TOK_MAC }, 275 { "mac", TOK_MAC }, 276 { "mac-type", TOK_MACTYPE }, 277 { "verrevpath", TOK_VERREVPATH }, 278 { "versrcreach", TOK_VERSRCREACH }, 279 { "antispoof", TOK_ANTISPOOF }, 280 { "ipsec", TOK_IPSEC }, 281 { "icmp6type", TOK_ICMP6TYPES }, 282 { "icmp6types", TOK_ICMP6TYPES }, 283 { "ext6hdr", TOK_EXT6HDR}, 284 { "flow-id", TOK_FLOWID}, 285 { "ipv6", TOK_IPV6}, 286 { "ip6", TOK_IPV6}, 287 { "ipv4", TOK_IPV4}, 288 { "ip4", TOK_IPV4}, 289 { "dst-ipv6", TOK_DSTIP6}, 290 { "dst-ip6", TOK_DSTIP6}, 291 { "src-ipv6", TOK_SRCIP6}, 292 { "src-ip6", TOK_SRCIP6}, 293 { "//", TOK_COMMENT }, 294 295 { "not", TOK_NOT }, /* pseudo option */ 296 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 297 { "or", TOK_OR }, /* pseudo option */ 298 { "|", /* escape */ TOK_OR }, /* pseudo option */ 299 { "{", TOK_STARTBRACE }, /* pseudo option */ 300 { "(", TOK_STARTBRACE }, /* pseudo option */ 301 { "}", TOK_ENDBRACE }, /* pseudo option */ 302 { ")", TOK_ENDBRACE }, /* pseudo option */ 303 { NULL, 0 } /* terminator */ 304}; 305 306/* 307 * The following is used to generate a printable argument for 308 * 64-bit numbers, irrespective of platform alignment and bit size. 309 * Because all the printf in this program use %llu as a format, 310 * we just return an unsigned long long, which is larger than 311 * we need in certain cases, but saves the hassle of using 312 * PRIu64 as a format specifier. 313 * We don't care about inlining, this is not performance critical code. 314 */ 315unsigned long long 316align_uint64(const uint64_t *pll) 317{ 318 uint64_t ret; 319 320 bcopy (pll, &ret, sizeof(ret)); 321 return ret; 322} 323 324void * 325safe_calloc(size_t number, size_t size) 326{ 327 void *ret = calloc(number, size); 328 329 if (ret == NULL) 330 err(EX_OSERR, "calloc"); 331 return ret; 332} 333 334void * 335safe_realloc(void *ptr, size_t size) 336{ 337 void *ret = realloc(ptr, size); 338 339 if (ret == NULL) 340 err(EX_OSERR, "realloc"); 341 return ret; 342} 343 344/* 345 * conditionally runs the command. 346 */ 347int 348do_cmd(int optname, void *optval, uintptr_t optlen) 349{ 350 static int s = -1; /* the socket */ 351 int i; 352 353 if (co.test_only) 354 return 0; 355 356 if (s == -1) 357 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 358 if (s < 0) 359 err(EX_UNAVAILABLE, "socket"); 360 361 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 362 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 363 optname == IP_FW_TABLE_GETSIZE || 364 optname == IP_FW_NAT_GET_CONFIG || 365 optname == IP_FW_NAT_GET_LOG) 366 i = getsockopt(s, IPPROTO_IP, optname, optval, 367 (socklen_t *)optlen); 368 else 369 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 370 return i; 371} 372 373/** 374 * match_token takes a table and a string, returns the value associated 375 * with the string (-1 in case of failure). 376 */ 377int 378match_token(struct _s_x *table, char *string) 379{ 380 struct _s_x *pt; 381 uint i = strlen(string); 382 383 for (pt = table ; i && pt->s != NULL ; pt++) 384 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 385 return pt->x; 386 return -1; 387} 388 389/** 390 * match_value takes a table and a value, returns the string associated 391 * with the value (NULL in case of failure). 392 */ 393char const * 394match_value(struct _s_x *p, int value) 395{ 396 for (; p->s != NULL; p++) 397 if (p->x == value) 398 return p->s; 399 return NULL; 400} 401 402/* 403 * _substrcmp takes two strings and returns 1 if they do not match, 404 * and 0 if they match exactly or the first string is a sub-string 405 * of the second. A warning is printed to stderr in the case that the 406 * first string is a sub-string of the second. 407 * 408 * This function will be removed in the future through the usual 409 * deprecation process. 410 */ 411int 412_substrcmp(const char *str1, const char* str2) 413{ 414 415 if (strncmp(str1, str2, strlen(str1)) != 0) 416 return 1; 417 418 if (strlen(str1) != strlen(str2)) 419 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 420 str1, str2); 421 return 0; 422} 423 424/* 425 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 426 * and 0 if they match exactly or the second string is a sub-string 427 * of the first. A warning is printed to stderr in the case that the 428 * first string does not match the third. 429 * 430 * This function exists to warn about the bizzare construction 431 * strncmp(str, "by", 2) which is used to allow people to use a shotcut 432 * for "bytes". The problem is that in addition to accepting "by", 433 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 434 * other string beginning with "by". 435 * 436 * This function will be removed in the future through the usual 437 * deprecation process. 438 */ 439int 440_substrcmp2(const char *str1, const char* str2, const char* str3) 441{ 442 443 if (strncmp(str1, str2, strlen(str2)) != 0) 444 return 1; 445 446 if (strcmp(str1, str3) != 0) 447 warnx("DEPRECATED: '%s' matched '%s'", 448 str1, str3); 449 return 0; 450} 451 452/* 453 * prints one port, symbolic or numeric 454 */ 455static void 456print_port(int proto, uint16_t port) 457{ 458 459 if (proto == IPPROTO_ETHERTYPE) { 460 char const *s; 461 462 if (co.do_resolv && (s = match_value(ether_types, port)) ) 463 printf("%s", s); 464 else 465 printf("0x%04x", port); 466 } else { 467 struct servent *se = NULL; 468 if (co.do_resolv) { 469 struct protoent *pe = getprotobynumber(proto); 470 471 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 472 } 473 if (se) 474 printf("%s", se->s_name); 475 else 476 printf("%d", port); 477 } 478} 479 480static struct _s_x _port_name[] = { 481 {"dst-port", O_IP_DSTPORT}, 482 {"src-port", O_IP_SRCPORT}, 483 {"ipid", O_IPID}, 484 {"iplen", O_IPLEN}, 485 {"ipttl", O_IPTTL}, 486 {"mac-type", O_MAC_TYPE}, 487 {"tcpdatalen", O_TCPDATALEN}, 488 {"tagged", O_TAGGED}, 489 {NULL, 0} 490}; 491 492/* 493 * Print the values in a list 16-bit items of the types above. 494 * XXX todo: add support for mask. 495 */ 496static void 497print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 498{ 499 uint16_t *p = cmd->ports; 500 int i; 501 char const *sep; 502 503 if (opcode != 0) { 504 sep = match_value(_port_name, opcode); 505 if (sep == NULL) 506 sep = "???"; 507 printf (" %s", sep); 508 } 509 sep = " "; 510 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 511 printf("%s", sep); 512 print_port(proto, p[0]); 513 if (p[0] != p[1]) { 514 printf("-"); 515 print_port(proto, p[1]); 516 } 517 sep = ","; 518 } 519} 520 521/* 522 * Like strtol, but also translates service names into port numbers 523 * for some protocols. 524 * In particular: 525 * proto == -1 disables the protocol check; 526 * proto == IPPROTO_ETHERTYPE looks up an internal table 527 * proto == <some value in /etc/protocols> matches the values there. 528 * Returns *end == s in case the parameter is not found. 529 */ 530static int 531strtoport(char *s, char **end, int base, int proto) 532{ 533 char *p, *buf; 534 char *s1; 535 int i; 536 537 *end = s; /* default - not found */ 538 if (*s == '\0') 539 return 0; /* not found */ 540 541 if (isdigit(*s)) 542 return strtol(s, end, base); 543 544 /* 545 * find separator. '\\' escapes the next char. 546 */ 547 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 548 if (*s1 == '\\' && s1[1] != '\0') 549 s1++; 550 551 buf = safe_calloc(s1 - s + 1, 1); 552 553 /* 554 * copy into a buffer skipping backslashes 555 */ 556 for (p = s, i = 0; p != s1 ; p++) 557 if (*p != '\\') 558 buf[i++] = *p; 559 buf[i++] = '\0'; 560 561 if (proto == IPPROTO_ETHERTYPE) { 562 i = match_token(ether_types, buf); 563 free(buf); 564 if (i != -1) { /* found */ 565 *end = s1; 566 return i; 567 } 568 } else { 569 struct protoent *pe = NULL; 570 struct servent *se; 571 572 if (proto != 0) 573 pe = getprotobynumber(proto); 574 setservent(1); 575 se = getservbyname(buf, pe ? pe->p_name : NULL); 576 free(buf); 577 if (se != NULL) { 578 *end = s1; 579 return ntohs(se->s_port); 580 } 581 } 582 return 0; /* not found */ 583} 584 585/* 586 * Fill the body of the command with the list of port ranges. 587 */ 588static int 589fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 590{ 591 uint16_t a, b, *p = cmd->ports; 592 int i = 0; 593 char *s = av; 594 595 while (*s) { 596 a = strtoport(av, &s, 0, proto); 597 if (s == av) /* empty or invalid argument */ 598 return (0); 599 600 switch (*s) { 601 case '-': /* a range */ 602 av = s + 1; 603 b = strtoport(av, &s, 0, proto); 604 /* Reject expressions like '1-abc' or '1-2-3'. */ 605 if (s == av || (*s != ',' && *s != '\0')) 606 return (0); 607 p[0] = a; 608 p[1] = b; 609 break; 610 case ',': /* comma separated list */ 611 case '\0': 612 p[0] = p[1] = a; 613 break; 614 default: 615 warnx("port list: invalid separator <%c> in <%s>", 616 *s, av); 617 return (0); 618 } 619 620 i++; 621 p += 2; 622 av = s + 1; 623 } 624 if (i > 0) { 625 if (i + 1 > F_LEN_MASK) 626 errx(EX_DATAERR, "too many ports/ranges\n"); 627 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 628 } 629 return (i); 630} 631 632static struct _s_x icmpcodes[] = { 633 { "net", ICMP_UNREACH_NET }, 634 { "host", ICMP_UNREACH_HOST }, 635 { "protocol", ICMP_UNREACH_PROTOCOL }, 636 { "port", ICMP_UNREACH_PORT }, 637 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 638 { "srcfail", ICMP_UNREACH_SRCFAIL }, 639 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 640 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 641 { "isolated", ICMP_UNREACH_ISOLATED }, 642 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 643 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 644 { "tosnet", ICMP_UNREACH_TOSNET }, 645 { "toshost", ICMP_UNREACH_TOSHOST }, 646 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 647 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 648 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 649 { NULL, 0 } 650}; 651 652static void 653fill_reject_code(u_short *codep, char *str) 654{ 655 int val; 656 char *s; 657 658 val = strtoul(str, &s, 0); 659 if (s == str || *s != '\0' || val >= 0x100) 660 val = match_token(icmpcodes, str); 661 if (val < 0) 662 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 663 *codep = val; 664 return; 665} 666 667static void 668print_reject_code(uint16_t code) 669{ 670 char const *s = match_value(icmpcodes, code); 671 672 if (s != NULL) 673 printf("unreach %s", s); 674 else 675 printf("unreach %u", code); 676} 677 678/* 679 * Returns the number of bits set (from left) in a contiguous bitmask, 680 * or -1 if the mask is not contiguous. 681 * XXX this needs a proper fix. 682 * This effectively works on masks in big-endian (network) format. 683 * when compiled on little endian architectures. 684 * 685 * First bit is bit 7 of the first byte -- note, for MAC addresses, 686 * the first bit on the wire is bit 0 of the first byte. 687 * len is the max length in bits. 688 */ 689int 690contigmask(uint8_t *p, int len) 691{ 692 int i, n; 693 694 for (i=0; i<len ; i++) 695 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 696 break; 697 for (n=i+1; n < len; n++) 698 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 699 return -1; /* mask not contiguous */ 700 return i; 701} 702 703/* 704 * print flags set/clear in the two bitmasks passed as parameters. 705 * There is a specialized check for f_tcpflags. 706 */ 707static void 708print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 709{ 710 char const *comma = ""; 711 int i; 712 uint8_t set = cmd->arg1 & 0xff; 713 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 714 715 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 716 printf(" setup"); 717 return; 718 } 719 720 printf(" %s ", name); 721 for (i=0; list[i].x != 0; i++) { 722 if (set & list[i].x) { 723 set &= ~list[i].x; 724 printf("%s%s", comma, list[i].s); 725 comma = ","; 726 } 727 if (clear & list[i].x) { 728 clear &= ~list[i].x; 729 printf("%s!%s", comma, list[i].s); 730 comma = ","; 731 } 732 } 733} 734 735/* 736 * Print the ip address contained in a command. 737 */ 738static void 739print_ip(ipfw_insn_ip *cmd, char const *s) 740{ 741 struct hostent *he = NULL; 742 int len = F_LEN((ipfw_insn *)cmd); 743 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 744 745 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 746 747 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 748 printf("me"); 749 return; 750 } 751 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 752 cmd->o.opcode == O_IP_DST_LOOKUP) { 753 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 754 if (len == F_INSN_SIZE(ipfw_insn_u32)) 755 printf(",%u", *a); 756 printf(")"); 757 return; 758 } 759 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 760 uint32_t x, *map = (uint32_t *)&(cmd->mask); 761 int i, j; 762 char comma = '{'; 763 764 x = cmd->o.arg1 - 1; 765 x = htonl( ~x ); 766 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 767 printf("%s/%d", inet_ntoa(cmd->addr), 768 contigmask((uint8_t *)&x, 32)); 769 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 770 x &= 0xff; /* base */ 771 /* 772 * Print bits and ranges. 773 * Locate first bit set (i), then locate first bit unset (j). 774 * If we have 3+ consecutive bits set, then print them as a 775 * range, otherwise only print the initial bit and rescan. 776 */ 777 for (i=0; i < cmd->o.arg1; i++) 778 if (map[i/32] & (1<<(i & 31))) { 779 for (j=i+1; j < cmd->o.arg1; j++) 780 if (!(map[ j/32] & (1<<(j & 31)))) 781 break; 782 printf("%c%d", comma, i+x); 783 if (j>i+2) { /* range has at least 3 elements */ 784 printf("-%d", j-1+x); 785 i = j-1; 786 } 787 comma = ','; 788 } 789 printf("}"); 790 return; 791 } 792 /* 793 * len == 2 indicates a single IP, whereas lists of 1 or more 794 * addr/mask pairs have len = (2n+1). We convert len to n so we 795 * use that to count the number of entries. 796 */ 797 for (len = len / 2; len > 0; len--, a += 2) { 798 int mb = /* mask length */ 799 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 800 32 : contigmask((uint8_t *)&(a[1]), 32); 801 if (mb == 32 && co.do_resolv) 802 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 803 if (he != NULL) /* resolved to name */ 804 printf("%s", he->h_name); 805 else if (mb == 0) /* any */ 806 printf("any"); 807 else { /* numeric IP followed by some kind of mask */ 808 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 809 if (mb < 0) 810 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 811 else if (mb < 32) 812 printf("/%d", mb); 813 } 814 if (len > 1) 815 printf(","); 816 } 817} 818 819/* 820 * prints a MAC address/mask pair 821 */ 822static void 823print_mac(uint8_t *addr, uint8_t *mask) 824{ 825 int l = contigmask(mask, 48); 826 827 if (l == 0) 828 printf(" any"); 829 else { 830 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 831 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 832 if (l == -1) 833 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 834 mask[0], mask[1], mask[2], 835 mask[3], mask[4], mask[5]); 836 else if (l < 48) 837 printf("/%d", l); 838 } 839} 840 841static void 842fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 843{ 844 uint8_t type; 845 846 cmd->d[0] = 0; 847 while (*av) { 848 if (*av == ',') 849 av++; 850 851 type = strtoul(av, &av, 0); 852 853 if (*av != ',' && *av != '\0') 854 errx(EX_DATAERR, "invalid ICMP type"); 855 856 if (type > 31) 857 errx(EX_DATAERR, "ICMP type out of range"); 858 859 cmd->d[0] |= 1 << type; 860 } 861 cmd->o.opcode = O_ICMPTYPE; 862 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 863} 864 865static void 866print_icmptypes(ipfw_insn_u32 *cmd) 867{ 868 int i; 869 char sep= ' '; 870 871 printf(" icmptypes"); 872 for (i = 0; i < 32; i++) { 873 if ( (cmd->d[0] & (1 << (i))) == 0) 874 continue; 875 printf("%c%d", sep, i); 876 sep = ','; 877 } 878} 879 880/* 881 * show_ipfw() prints the body of an ipfw rule. 882 * Because the standard rule has at least proto src_ip dst_ip, we use 883 * a helper function to produce these entries if not provided explicitly. 884 * The first argument is the list of fields we have, the second is 885 * the list of fields we want to be printed. 886 * 887 * Special cases if we have provided a MAC header: 888 * + if the rule does not contain IP addresses/ports, do not print them; 889 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 890 * 891 * Once we have 'have_options', IP header fields are printed as options. 892 */ 893#define HAVE_PROTO 0x0001 894#define HAVE_SRCIP 0x0002 895#define HAVE_DSTIP 0x0004 896#define HAVE_PROTO4 0x0008 897#define HAVE_PROTO6 0x0010 898#define HAVE_OPTIONS 0x8000 899 900#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 901static void 902show_prerequisites(int *flags, int want, int cmd __unused) 903{ 904 if (co.comment_only) 905 return; 906 if ( (*flags & HAVE_IP) == HAVE_IP) 907 *flags |= HAVE_OPTIONS; 908 909 if ( !(*flags & HAVE_OPTIONS)) { 910 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 911 if ( (*flags & HAVE_PROTO4)) 912 printf(" ip4"); 913 else if ( (*flags & HAVE_PROTO6)) 914 printf(" ip6"); 915 else 916 printf(" ip"); 917 } 918 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 919 printf(" from any"); 920 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 921 printf(" to any"); 922 } 923 *flags |= want; 924} 925 926static void 927show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 928{ 929 static int twidth = 0; 930 int l; 931 ipfw_insn *cmd, *tagptr = NULL; 932 const char *comment = NULL; /* ptr to comment if we have one */ 933 int proto = 0; /* default */ 934 int flags = 0; /* prerequisites */ 935 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 936 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 937 int or_block = 0; /* we are in an or block */ 938 uint32_t set_disable; 939 940 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 941 942 if (set_disable & (1 << rule->set)) { /* disabled */ 943 if (!co.show_sets) 944 return; 945 else 946 printf("# DISABLED "); 947 } 948 printf("%05u ", rule->rulenum); 949 950 if (pcwidth>0 || bcwidth>0) 951 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 952 bcwidth, align_uint64(&rule->bcnt)); 953 954 if (co.do_time == 2) 955 printf("%10u ", rule->timestamp); 956 else if (co.do_time == 1) { 957 char timestr[30]; 958 time_t t = (time_t)0; 959 960 if (twidth == 0) { 961 strcpy(timestr, ctime(&t)); 962 *strchr(timestr, '\n') = '\0'; 963 twidth = strlen(timestr); 964 } 965 if (rule->timestamp) { 966 t = _long_to_time(rule->timestamp); 967 968 strcpy(timestr, ctime(&t)); 969 *strchr(timestr, '\n') = '\0'; 970 printf("%s ", timestr); 971 } else { 972 printf("%*s", twidth, " "); 973 } 974 } 975 976 if (co.show_sets) 977 printf("set %d ", rule->set); 978 979 /* 980 * print the optional "match probability" 981 */ 982 if (rule->cmd_len > 0) { 983 cmd = rule->cmd ; 984 if (cmd->opcode == O_PROB) { 985 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 986 double d = 1.0 * p->d[0]; 987 988 d = (d / 0x7fffffff); 989 printf("prob %f ", d); 990 } 991 } 992 993 /* 994 * first print actions 995 */ 996 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 997 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 998 switch(cmd->opcode) { 999 case O_CHECK_STATE: 1000 printf("check-state"); 1001 flags = HAVE_IP; /* avoid printing anything else */ 1002 break; 1003 1004 case O_ACCEPT: 1005 printf("allow"); 1006 break; 1007 1008 case O_COUNT: 1009 printf("count"); 1010 break; 1011 1012 case O_DENY: 1013 printf("deny"); 1014 break; 1015 1016 case O_REJECT: 1017 if (cmd->arg1 == ICMP_REJECT_RST) 1018 printf("reset"); 1019 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1020 printf("reject"); 1021 else 1022 print_reject_code(cmd->arg1); 1023 break; 1024 1025 case O_UNREACH6: 1026 if (cmd->arg1 == ICMP6_UNREACH_RST) 1027 printf("reset6"); 1028 else 1029 print_unreach6_code(cmd->arg1); 1030 break; 1031 1032 case O_SKIPTO: 1033 PRINT_UINT_ARG("skipto ", cmd->arg1); 1034 break; 1035 1036 case O_PIPE: 1037 PRINT_UINT_ARG("pipe ", cmd->arg1); 1038 break; 1039 1040 case O_QUEUE: 1041 PRINT_UINT_ARG("queue ", cmd->arg1); 1042 break; 1043 1044 case O_DIVERT: 1045 PRINT_UINT_ARG("divert ", cmd->arg1); 1046 break; 1047 1048 case O_TEE: 1049 PRINT_UINT_ARG("tee ", cmd->arg1); 1050 break; 1051 1052 case O_NETGRAPH: 1053 PRINT_UINT_ARG("netgraph ", cmd->arg1); 1054 break; 1055 1056 case O_NGTEE: 1057 PRINT_UINT_ARG("ngtee ", cmd->arg1); 1058 break; 1059 1060 case O_FORWARD_IP: 1061 { 1062 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1063 1064 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1065 printf("fwd tablearg"); 1066 } else { 1067 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1068 } 1069 if (s->sa.sin_port) 1070 printf(",%d", s->sa.sin_port); 1071 } 1072 break; 1073 1074 case O_LOG: /* O_LOG is printed last */ 1075 logptr = (ipfw_insn_log *)cmd; 1076 break; 1077 1078 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1079 altqptr = (ipfw_insn_altq *)cmd; 1080 break; 1081 1082 case O_TAG: 1083 tagptr = cmd; 1084 break; 1085 1086 case O_NAT: 1087 PRINT_UINT_ARG("nat ", cmd->arg1); 1088 break; 1089 1090 case O_SETFIB: 1091 PRINT_UINT_ARG("setfib ", cmd->arg1); 1092 break; 1093 1094 case O_REASS: 1095 printf("reass"); 1096 break; 1097 1098 default: 1099 printf("** unrecognized action %d len %d ", 1100 cmd->opcode, cmd->len); 1101 } 1102 } 1103 if (logptr) { 1104 if (logptr->max_log > 0) 1105 printf(" log logamount %d", logptr->max_log); 1106 else 1107 printf(" log"); 1108 } 1109 if (altqptr) { 1110 print_altq_cmd(altqptr); 1111 } 1112 if (tagptr) { 1113 if (tagptr->len & F_NOT) 1114 PRINT_UINT_ARG(" untag ", tagptr->arg1); 1115 else 1116 PRINT_UINT_ARG(" tag ", tagptr->arg1); 1117 } 1118 1119 /* 1120 * then print the body. 1121 */ 1122 for (l = rule->act_ofs, cmd = rule->cmd ; 1123 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1124 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1125 continue; 1126 if (cmd->opcode == O_IP4) { 1127 flags |= HAVE_PROTO4; 1128 break; 1129 } else if (cmd->opcode == O_IP6) { 1130 flags |= HAVE_PROTO6; 1131 break; 1132 } 1133 } 1134 if (rule->_pad & 1) { /* empty rules before options */ 1135 if (!co.do_compact) { 1136 show_prerequisites(&flags, HAVE_PROTO, 0); 1137 printf(" from any to any"); 1138 } 1139 flags |= HAVE_IP | HAVE_OPTIONS; 1140 } 1141 1142 if (co.comment_only) 1143 comment = "..."; 1144 1145 for (l = rule->act_ofs, cmd = rule->cmd ; 1146 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1147 /* useful alias */ 1148 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1149 1150 if (co.comment_only) { 1151 if (cmd->opcode != O_NOP) 1152 continue; 1153 printf(" // %s\n", (char *)(cmd + 1)); 1154 return; 1155 } 1156 1157 show_prerequisites(&flags, 0, cmd->opcode); 1158 1159 switch(cmd->opcode) { 1160 case O_PROB: 1161 break; /* done already */ 1162 1163 case O_PROBE_STATE: 1164 break; /* no need to print anything here */ 1165 1166 case O_IP_SRC: 1167 case O_IP_SRC_LOOKUP: 1168 case O_IP_SRC_MASK: 1169 case O_IP_SRC_ME: 1170 case O_IP_SRC_SET: 1171 show_prerequisites(&flags, HAVE_PROTO, 0); 1172 if (!(flags & HAVE_SRCIP)) 1173 printf(" from"); 1174 if ((cmd->len & F_OR) && !or_block) 1175 printf(" {"); 1176 print_ip((ipfw_insn_ip *)cmd, 1177 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1178 flags |= HAVE_SRCIP; 1179 break; 1180 1181 case O_IP_DST: 1182 case O_IP_DST_LOOKUP: 1183 case O_IP_DST_MASK: 1184 case O_IP_DST_ME: 1185 case O_IP_DST_SET: 1186 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1187 if (!(flags & HAVE_DSTIP)) 1188 printf(" to"); 1189 if ((cmd->len & F_OR) && !or_block) 1190 printf(" {"); 1191 print_ip((ipfw_insn_ip *)cmd, 1192 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1193 flags |= HAVE_DSTIP; 1194 break; 1195 1196 case O_IP6_SRC: 1197 case O_IP6_SRC_MASK: 1198 case O_IP6_SRC_ME: 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_ip6((ipfw_insn_ip6 *)cmd, 1205 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1206 flags |= HAVE_SRCIP | HAVE_PROTO; 1207 break; 1208 1209 case O_IP6_DST: 1210 case O_IP6_DST_MASK: 1211 case O_IP6_DST_ME: 1212 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1213 if (!(flags & HAVE_DSTIP)) 1214 printf(" to"); 1215 if ((cmd->len & F_OR) && !or_block) 1216 printf(" {"); 1217 print_ip6((ipfw_insn_ip6 *)cmd, 1218 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1219 flags |= HAVE_DSTIP; 1220 break; 1221 1222 case O_FLOW6ID: 1223 print_flow6id( (ipfw_insn_u32 *) cmd ); 1224 flags |= HAVE_OPTIONS; 1225 break; 1226 1227 case O_IP_DSTPORT: 1228 show_prerequisites(&flags, HAVE_IP, 0); 1229 case O_IP_SRCPORT: 1230 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1231 if ((cmd->len & F_OR) && !or_block) 1232 printf(" {"); 1233 if (cmd->len & F_NOT) 1234 printf(" not"); 1235 print_newports((ipfw_insn_u16 *)cmd, proto, 1236 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1237 break; 1238 1239 case O_PROTO: { 1240 struct protoent *pe = NULL; 1241 1242 if ((cmd->len & F_OR) && !or_block) 1243 printf(" {"); 1244 if (cmd->len & F_NOT) 1245 printf(" not"); 1246 proto = cmd->arg1; 1247 pe = getprotobynumber(cmd->arg1); 1248 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1249 !(flags & HAVE_PROTO)) 1250 show_prerequisites(&flags, 1251 HAVE_IP | HAVE_OPTIONS, 0); 1252 if (flags & HAVE_OPTIONS) 1253 printf(" proto"); 1254 if (pe) 1255 printf(" %s", pe->p_name); 1256 else 1257 printf(" %u", cmd->arg1); 1258 } 1259 flags |= HAVE_PROTO; 1260 break; 1261 1262 default: /*options ... */ 1263 if (!(cmd->len & (F_OR|F_NOT))) 1264 if (((cmd->opcode == O_IP6) && 1265 (flags & HAVE_PROTO6)) || 1266 ((cmd->opcode == O_IP4) && 1267 (flags & HAVE_PROTO4))) 1268 break; 1269 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1270 if ((cmd->len & F_OR) && !or_block) 1271 printf(" {"); 1272 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1273 printf(" not"); 1274 switch(cmd->opcode) { 1275 case O_MACADDR2: { 1276 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1277 1278 printf(" MAC"); 1279 print_mac(m->addr, m->mask); 1280 print_mac(m->addr + 6, m->mask + 6); 1281 } 1282 break; 1283 1284 case O_MAC_TYPE: 1285 print_newports((ipfw_insn_u16 *)cmd, 1286 IPPROTO_ETHERTYPE, cmd->opcode); 1287 break; 1288 1289 1290 case O_FRAG: 1291 printf(" frag"); 1292 break; 1293 1294 case O_FIB: 1295 printf(" fib %u", cmd->arg1 ); 1296 break; 1297 1298 case O_IN: 1299 printf(cmd->len & F_NOT ? " out" : " in"); 1300 break; 1301 1302 case O_DIVERTED: 1303 switch (cmd->arg1) { 1304 case 3: 1305 printf(" diverted"); 1306 break; 1307 case 1: 1308 printf(" diverted-loopback"); 1309 break; 1310 case 2: 1311 printf(" diverted-output"); 1312 break; 1313 default: 1314 printf(" diverted-?<%u>", cmd->arg1); 1315 break; 1316 } 1317 break; 1318 1319 case O_LAYER2: 1320 printf(" layer2"); 1321 break; 1322 case O_XMIT: 1323 case O_RECV: 1324 case O_VIA: 1325 { 1326 char const *s; 1327 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1328 1329 if (cmd->opcode == O_XMIT) 1330 s = "xmit"; 1331 else if (cmd->opcode == O_RECV) 1332 s = "recv"; 1333 else /* if (cmd->opcode == O_VIA) */ 1334 s = "via"; 1335 if (cmdif->name[0] == '\0') 1336 printf(" %s %s", s, 1337 inet_ntoa(cmdif->p.ip)); 1338 else 1339 printf(" %s %s", s, cmdif->name); 1340 1341 break; 1342 } 1343 case O_IPID: 1344 if (F_LEN(cmd) == 1) 1345 printf(" ipid %u", cmd->arg1 ); 1346 else 1347 print_newports((ipfw_insn_u16 *)cmd, 0, 1348 O_IPID); 1349 break; 1350 1351 case O_IPTTL: 1352 if (F_LEN(cmd) == 1) 1353 printf(" ipttl %u", cmd->arg1 ); 1354 else 1355 print_newports((ipfw_insn_u16 *)cmd, 0, 1356 O_IPTTL); 1357 break; 1358 1359 case O_IPVER: 1360 printf(" ipver %u", cmd->arg1 ); 1361 break; 1362 1363 case O_IPPRECEDENCE: 1364 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1365 break; 1366 1367 case O_IPLEN: 1368 if (F_LEN(cmd) == 1) 1369 printf(" iplen %u", cmd->arg1 ); 1370 else 1371 print_newports((ipfw_insn_u16 *)cmd, 0, 1372 O_IPLEN); 1373 break; 1374 1375 case O_IPOPT: 1376 print_flags("ipoptions", cmd, f_ipopts); 1377 break; 1378 1379 case O_IPTOS: 1380 print_flags("iptos", cmd, f_iptos); 1381 break; 1382 1383 case O_ICMPTYPE: 1384 print_icmptypes((ipfw_insn_u32 *)cmd); 1385 break; 1386 1387 case O_ESTAB: 1388 printf(" established"); 1389 break; 1390 1391 case O_TCPDATALEN: 1392 if (F_LEN(cmd) == 1) 1393 printf(" tcpdatalen %u", cmd->arg1 ); 1394 else 1395 print_newports((ipfw_insn_u16 *)cmd, 0, 1396 O_TCPDATALEN); 1397 break; 1398 1399 case O_TCPFLAGS: 1400 print_flags("tcpflags", cmd, f_tcpflags); 1401 break; 1402 1403 case O_TCPOPTS: 1404 print_flags("tcpoptions", cmd, f_tcpopts); 1405 break; 1406 1407 case O_TCPWIN: 1408 printf(" tcpwin %d", ntohs(cmd->arg1)); 1409 break; 1410 1411 case O_TCPACK: 1412 printf(" tcpack %d", ntohl(cmd32->d[0])); 1413 break; 1414 1415 case O_TCPSEQ: 1416 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1417 break; 1418 1419 case O_UID: 1420 { 1421 struct passwd *pwd = getpwuid(cmd32->d[0]); 1422 1423 if (pwd) 1424 printf(" uid %s", pwd->pw_name); 1425 else 1426 printf(" uid %u", cmd32->d[0]); 1427 } 1428 break; 1429 1430 case O_GID: 1431 { 1432 struct group *grp = getgrgid(cmd32->d[0]); 1433 1434 if (grp) 1435 printf(" gid %s", grp->gr_name); 1436 else 1437 printf(" gid %u", cmd32->d[0]); 1438 } 1439 break; 1440 1441 case O_JAIL: 1442 printf(" jail %d", cmd32->d[0]); 1443 break; 1444 1445 case O_VERREVPATH: 1446 printf(" verrevpath"); 1447 break; 1448 1449 case O_VERSRCREACH: 1450 printf(" versrcreach"); 1451 break; 1452 1453 case O_ANTISPOOF: 1454 printf(" antispoof"); 1455 break; 1456 1457 case O_IPSEC: 1458 printf(" ipsec"); 1459 break; 1460 1461 case O_NOP: 1462 comment = (char *)(cmd + 1); 1463 break; 1464 1465 case O_KEEP_STATE: 1466 printf(" keep-state"); 1467 break; 1468 1469 case O_LIMIT: { 1470 struct _s_x *p = limit_masks; 1471 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1472 uint8_t x = c->limit_mask; 1473 char const *comma = " "; 1474 1475 printf(" limit"); 1476 for (; p->x != 0 ; p++) 1477 if ((x & p->x) == p->x) { 1478 x &= ~p->x; 1479 printf("%s%s", comma, p->s); 1480 comma = ","; 1481 } 1482 PRINT_UINT_ARG(" ", c->conn_limit); 1483 break; 1484 } 1485 1486 case O_IP6: 1487 printf(" ip6"); 1488 break; 1489 1490 case O_IP4: 1491 printf(" ip4"); 1492 break; 1493 1494 case O_ICMP6TYPE: 1495 print_icmp6types((ipfw_insn_u32 *)cmd); 1496 break; 1497 1498 case O_EXT_HDR: 1499 print_ext6hdr( (ipfw_insn *) cmd ); 1500 break; 1501 1502 case O_TAGGED: 1503 if (F_LEN(cmd) == 1) 1504 PRINT_UINT_ARG(" tagged ", cmd->arg1); 1505 else 1506 print_newports((ipfw_insn_u16 *)cmd, 0, 1507 O_TAGGED); 1508 break; 1509 1510 default: 1511 printf(" [opcode %d len %d]", 1512 cmd->opcode, cmd->len); 1513 } 1514 } 1515 if (cmd->len & F_OR) { 1516 printf(" or"); 1517 or_block = 1; 1518 } else if (or_block) { 1519 printf(" }"); 1520 or_block = 0; 1521 } 1522 } 1523 show_prerequisites(&flags, HAVE_IP, 0); 1524 if (comment) 1525 printf(" // %s", comment); 1526 printf("\n"); 1527} 1528 1529static void 1530show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1531{ 1532 struct protoent *pe; 1533 struct in_addr a; 1534 uint16_t rulenum; 1535 char buf[INET6_ADDRSTRLEN]; 1536 1537 if (!co.do_expired) { 1538 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1539 return; 1540 } 1541 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1542 printf("%05d", rulenum); 1543 if (pcwidth>0 || bcwidth>0) 1544 printf(" %*llu %*llu (%ds)", pcwidth, 1545 align_uint64(&d->pcnt), bcwidth, 1546 align_uint64(&d->bcnt), d->expire); 1547 switch (d->dyn_type) { 1548 case O_LIMIT_PARENT: 1549 printf(" PARENT %d", d->count); 1550 break; 1551 case O_LIMIT: 1552 printf(" LIMIT"); 1553 break; 1554 case O_KEEP_STATE: /* bidir, no mask */ 1555 printf(" STATE"); 1556 break; 1557 } 1558 1559 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1560 printf(" %s", pe->p_name); 1561 else 1562 printf(" proto %u", d->id.proto); 1563 1564 if (d->id.addr_type == 4) { 1565 a.s_addr = htonl(d->id.src_ip); 1566 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1567 1568 a.s_addr = htonl(d->id.dst_ip); 1569 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1570 } else if (d->id.addr_type == 6) { 1571 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 1572 sizeof(buf)), d->id.src_port); 1573 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, 1574 sizeof(buf)), d->id.dst_port); 1575 } else 1576 printf(" UNKNOWN <-> UNKNOWN\n"); 1577 1578 printf("\n"); 1579} 1580 1581/* 1582 * This one handles all set-related commands 1583 * ipfw set { show | enable | disable } 1584 * ipfw set swap X Y 1585 * ipfw set move X to Y 1586 * ipfw set move rule X to Y 1587 */ 1588void 1589ipfw_sets_handler(int ac, char *av[]) 1590{ 1591 uint32_t set_disable, masks[2]; 1592 int i, nbytes; 1593 uint16_t rulenum; 1594 uint8_t cmd, new_set; 1595 1596 ac--; 1597 av++; 1598 1599 if (!ac) 1600 errx(EX_USAGE, "set needs command"); 1601 if (_substrcmp(*av, "show") == 0) { 1602 void *data; 1603 char const *msg; 1604 1605 nbytes = sizeof(struct ip_fw); 1606 data = safe_calloc(1, nbytes); 1607 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1608 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1609 bcopy(&((struct ip_fw *)data)->next_rule, 1610 &set_disable, sizeof(set_disable)); 1611 1612 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1613 if ((set_disable & (1<<i))) { 1614 printf("%s %d", msg, i); 1615 msg = ""; 1616 } 1617 msg = (set_disable) ? " enable" : "enable"; 1618 for (i = 0; i < RESVD_SET; i++) 1619 if (!(set_disable & (1<<i))) { 1620 printf("%s %d", msg, i); 1621 msg = ""; 1622 } 1623 printf("\n"); 1624 } else if (_substrcmp(*av, "swap") == 0) { 1625 ac--; av++; 1626 if (ac != 2) 1627 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1628 rulenum = atoi(av[0]); 1629 new_set = atoi(av[1]); 1630 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1631 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1632 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1633 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1634 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1635 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1636 } else if (_substrcmp(*av, "move") == 0) { 1637 ac--; av++; 1638 if (ac && _substrcmp(*av, "rule") == 0) { 1639 cmd = 2; 1640 ac--; av++; 1641 } else 1642 cmd = 3; 1643 if (ac != 3 || _substrcmp(av[1], "to") != 0) 1644 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1645 rulenum = atoi(av[0]); 1646 new_set = atoi(av[2]); 1647 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1648 (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) ) 1649 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1650 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1651 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1652 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1653 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1654 } else if (_substrcmp(*av, "disable") == 0 || 1655 _substrcmp(*av, "enable") == 0 ) { 1656 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 1657 1658 ac--; av++; 1659 masks[0] = masks[1] = 0; 1660 1661 while (ac) { 1662 if (isdigit(**av)) { 1663 i = atoi(*av); 1664 if (i < 0 || i > RESVD_SET) 1665 errx(EX_DATAERR, 1666 "invalid set number %d\n", i); 1667 masks[which] |= (1<<i); 1668 } else if (_substrcmp(*av, "disable") == 0) 1669 which = 0; 1670 else if (_substrcmp(*av, "enable") == 0) 1671 which = 1; 1672 else 1673 errx(EX_DATAERR, 1674 "invalid set command %s\n", *av); 1675 av++; ac--; 1676 } 1677 if ( (masks[0] & masks[1]) != 0 ) 1678 errx(EX_DATAERR, 1679 "cannot enable and disable the same set\n"); 1680 1681 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1682 if (i) 1683 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1684 } else 1685 errx(EX_USAGE, "invalid set command %s\n", *av); 1686} 1687 1688void 1689ipfw_sysctl_handler(int ac, char *av[], int which) 1690{ 1691 ac--; 1692 av++; 1693 1694 if (ac == 0) { 1695 warnx("missing keyword to enable/disable\n"); 1696 } else if (_substrcmp(*av, "firewall") == 0) { 1697 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1698 &which, sizeof(which)); 1699 } else if (_substrcmp(*av, "one_pass") == 0) { 1700 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1701 &which, sizeof(which)); 1702 } else if (_substrcmp(*av, "debug") == 0) { 1703 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1704 &which, sizeof(which)); 1705 } else if (_substrcmp(*av, "verbose") == 0) { 1706 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1707 &which, sizeof(which)); 1708 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 1709 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1710 &which, sizeof(which)); 1711 } else if (_substrcmp(*av, "altq") == 0) { 1712 altq_set_enabled(which); 1713 } else { 1714 warnx("unrecognize enable/disable keyword: %s\n", *av); 1715 } 1716} 1717 1718void 1719ipfw_list(int ac, char *av[], int show_counters) 1720{ 1721 struct ip_fw *r; 1722 ipfw_dyn_rule *dynrules, *d; 1723 1724#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1725 char *lim; 1726 void *data = NULL; 1727 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1728 int exitval = EX_OK; 1729 int lac; 1730 char **lav; 1731 u_long rnum, last; 1732 char *endptr; 1733 int seen = 0; 1734 uint8_t set; 1735 1736 const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1737 int nalloc = 1024; /* start somewhere... */ 1738 1739 last = 0; 1740 1741 if (co.test_only) { 1742 fprintf(stderr, "Testing only, list disabled\n"); 1743 return; 1744 } 1745 1746 ac--; 1747 av++; 1748 1749 /* get rules or pipes from kernel, resizing array as necessary */ 1750 nbytes = nalloc; 1751 1752 while (nbytes >= nalloc) { 1753 nalloc = nalloc * 2 + 200; 1754 nbytes = nalloc; 1755 data = safe_realloc(data, nbytes); 1756 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1757 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1758 co.do_pipe ? "DUMMYNET" : "FW"); 1759 } 1760 1761 if (co.do_pipe) { 1762 ipfw_list_pipes(data, nbytes, ac, av); 1763 goto done; 1764 } 1765 1766 /* 1767 * Count static rules. They have variable size so we 1768 * need to scan the list to count them. 1769 */ 1770 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1771 r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim; 1772 ++nstat, r = NEXT(r) ) 1773 ; /* nothing */ 1774 1775 /* 1776 * Count dynamic rules. This is easier as they have 1777 * fixed size. 1778 */ 1779 r = NEXT(r); 1780 dynrules = (ipfw_dyn_rule *)r ; 1781 n = (char *)r - (char *)data; 1782 ndyn = (nbytes - n) / sizeof *dynrules; 1783 1784 /* if showing stats, figure out column widths ahead of time */ 1785 bcwidth = pcwidth = 0; 1786 if (show_counters) { 1787 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1788 /* skip rules from another set */ 1789 if (co.use_set && r->set != co.use_set - 1) 1790 continue; 1791 1792 /* packet counter */ 1793 width = snprintf(NULL, 0, "%llu", 1794 align_uint64(&r->pcnt)); 1795 if (width > pcwidth) 1796 pcwidth = width; 1797 1798 /* byte counter */ 1799 width = snprintf(NULL, 0, "%llu", 1800 align_uint64(&r->bcnt)); 1801 if (width > bcwidth) 1802 bcwidth = width; 1803 } 1804 } 1805 if (co.do_dynamic && ndyn) { 1806 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1807 if (co.use_set) { 1808 /* skip rules from another set */ 1809 bcopy((char *)&d->rule + sizeof(uint16_t), 1810 &set, sizeof(uint8_t)); 1811 if (set != co.use_set - 1) 1812 continue; 1813 } 1814 width = snprintf(NULL, 0, "%llu", 1815 align_uint64(&d->pcnt)); 1816 if (width > pcwidth) 1817 pcwidth = width; 1818 1819 width = snprintf(NULL, 0, "%llu", 1820 align_uint64(&d->bcnt)); 1821 if (width > bcwidth) 1822 bcwidth = width; 1823 } 1824 } 1825 /* if no rule numbers were specified, list all rules */ 1826 if (ac == 0) { 1827 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1828 if (co.use_set && r->set != co.use_set - 1) 1829 continue; 1830 show_ipfw(r, pcwidth, bcwidth); 1831 } 1832 1833 if (co.do_dynamic && ndyn) { 1834 printf("## Dynamic rules (%d):\n", ndyn); 1835 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1836 if (co.use_set) { 1837 bcopy((char *)&d->rule + sizeof(uint16_t), 1838 &set, sizeof(uint8_t)); 1839 if (set != co.use_set - 1) 1840 continue; 1841 } 1842 show_dyn_ipfw(d, pcwidth, bcwidth); 1843 } 1844 } 1845 goto done; 1846 } 1847 1848 /* display specific rules requested on command line */ 1849 1850 for (lac = ac, lav = av; lac != 0; lac--) { 1851 /* convert command line rule # */ 1852 last = rnum = strtoul(*lav++, &endptr, 10); 1853 if (*endptr == '-') 1854 last = strtoul(endptr+1, &endptr, 10); 1855 if (*endptr) { 1856 exitval = EX_USAGE; 1857 warnx("invalid rule number: %s", *(lav - 1)); 1858 continue; 1859 } 1860 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1861 if (r->rulenum > last) 1862 break; 1863 if (co.use_set && r->set != co.use_set - 1) 1864 continue; 1865 if (r->rulenum >= rnum && r->rulenum <= last) { 1866 show_ipfw(r, pcwidth, bcwidth); 1867 seen = 1; 1868 } 1869 } 1870 if (!seen) { 1871 /* give precedence to other error(s) */ 1872 if (exitval == EX_OK) 1873 exitval = EX_UNAVAILABLE; 1874 warnx("rule %lu does not exist", rnum); 1875 } 1876 } 1877 1878 if (co.do_dynamic && ndyn) { 1879 printf("## Dynamic rules:\n"); 1880 for (lac = ac, lav = av; lac != 0; lac--) { 1881 last = rnum = strtoul(*lav++, &endptr, 10); 1882 if (*endptr == '-') 1883 last = strtoul(endptr+1, &endptr, 10); 1884 if (*endptr) 1885 /* already warned */ 1886 continue; 1887 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1888 uint16_t rulenum; 1889 1890 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1891 if (rulenum > rnum) 1892 break; 1893 if (co.use_set) { 1894 bcopy((char *)&d->rule + sizeof(uint16_t), 1895 &set, sizeof(uint8_t)); 1896 if (set != co.use_set - 1) 1897 continue; 1898 } 1899 if (r->rulenum >= rnum && r->rulenum <= last) 1900 show_dyn_ipfw(d, pcwidth, bcwidth); 1901 } 1902 } 1903 } 1904 1905 ac = 0; 1906 1907done: 1908 free(data); 1909 1910 if (exitval != EX_OK) 1911 exit(exitval); 1912#undef NEXT 1913} 1914 1915static int 1916lookup_host (char *host, struct in_addr *ipaddr) 1917{ 1918 struct hostent *he; 1919 1920 if (!inet_aton(host, ipaddr)) { 1921 if ((he = gethostbyname(host)) == NULL) 1922 return(-1); 1923 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1924 } 1925 return(0); 1926} 1927 1928/* 1929 * fills the addr and mask fields in the instruction as appropriate from av. 1930 * Update length as appropriate. 1931 * The following formats are allowed: 1932 * me returns O_IP_*_ME 1933 * 1.2.3.4 single IP address 1934 * 1.2.3.4:5.6.7.8 address:mask 1935 * 1.2.3.4/24 address/mask 1936 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1937 * We can have multiple comma-separated address/mask entries. 1938 */ 1939static void 1940fill_ip(ipfw_insn_ip *cmd, char *av) 1941{ 1942 int len = 0; 1943 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1944 1945 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1946 1947 if (_substrcmp(av, "any") == 0) 1948 return; 1949 1950 if (_substrcmp(av, "me") == 0) { 1951 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1952 return; 1953 } 1954 1955 if (strncmp(av, "table(", 6) == 0) { 1956 char *p = strchr(av + 6, ','); 1957 1958 if (p) 1959 *p++ = '\0'; 1960 cmd->o.opcode = O_IP_DST_LOOKUP; 1961 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 1962 if (p) { 1963 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1964 d[0] = strtoul(p, NULL, 0); 1965 } else 1966 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1967 return; 1968 } 1969 1970 while (av) { 1971 /* 1972 * After the address we can have '/' or ':' indicating a mask, 1973 * ',' indicating another address follows, '{' indicating a 1974 * set of addresses of unspecified size. 1975 */ 1976 char *t = NULL, *p = strpbrk(av, "/:,{"); 1977 int masklen; 1978 char md, nd = '\0'; 1979 1980 if (p) { 1981 md = *p; 1982 *p++ = '\0'; 1983 if ((t = strpbrk(p, ",{")) != NULL) { 1984 nd = *t; 1985 *t = '\0'; 1986 } 1987 } else 1988 md = '\0'; 1989 1990 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1991 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1992 switch (md) { 1993 case ':': 1994 if (!inet_aton(p, (struct in_addr *)&d[1])) 1995 errx(EX_DATAERR, "bad netmask ``%s''", p); 1996 break; 1997 case '/': 1998 masklen = atoi(p); 1999 if (masklen == 0) 2000 d[1] = htonl(0); /* mask */ 2001 else if (masklen > 32) 2002 errx(EX_DATAERR, "bad width ``%s''", p); 2003 else 2004 d[1] = htonl(~0 << (32 - masklen)); 2005 break; 2006 case '{': /* no mask, assume /24 and put back the '{' */ 2007 d[1] = htonl(~0 << (32 - 24)); 2008 *(--p) = md; 2009 break; 2010 2011 case ',': /* single address plus continuation */ 2012 *(--p) = md; 2013 /* FALLTHROUGH */ 2014 case 0: /* initialization value */ 2015 default: 2016 d[1] = htonl(~0); /* force /32 */ 2017 break; 2018 } 2019 d[0] &= d[1]; /* mask base address with mask */ 2020 if (t) 2021 *t = nd; 2022 /* find next separator */ 2023 if (p) 2024 p = strpbrk(p, ",{"); 2025 if (p && *p == '{') { 2026 /* 2027 * We have a set of addresses. They are stored as follows: 2028 * arg1 is the set size (powers of 2, 2..256) 2029 * addr is the base address IN HOST FORMAT 2030 * mask.. is an array of arg1 bits (rounded up to 2031 * the next multiple of 32) with bits set 2032 * for each host in the map. 2033 */ 2034 uint32_t *map = (uint32_t *)&cmd->mask; 2035 int low, high; 2036 int i = contigmask((uint8_t *)&(d[1]), 32); 2037 2038 if (len > 0) 2039 errx(EX_DATAERR, "address set cannot be in a list"); 2040 if (i < 24 || i > 31) 2041 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2042 cmd->o.arg1 = 1<<(32-i); /* map length */ 2043 d[0] = ntohl(d[0]); /* base addr in host format */ 2044 cmd->o.opcode = O_IP_DST_SET; /* default */ 2045 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2046 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2047 map[i] = 0; /* clear map */ 2048 2049 av = p + 1; 2050 low = d[0] & 0xff; 2051 high = low + cmd->o.arg1 - 1; 2052 /* 2053 * Here, i stores the previous value when we specify a range 2054 * of addresses within a mask, e.g. 45-63. i = -1 means we 2055 * have no previous value. 2056 */ 2057 i = -1; /* previous value in a range */ 2058 while (isdigit(*av)) { 2059 char *s; 2060 int a = strtol(av, &s, 0); 2061 2062 if (s == av) { /* no parameter */ 2063 if (*av != '}') 2064 errx(EX_DATAERR, "set not closed\n"); 2065 if (i != -1) 2066 errx(EX_DATAERR, "incomplete range %d-", i); 2067 break; 2068 } 2069 if (a < low || a > high) 2070 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2071 a, low, high); 2072 a -= low; 2073 if (i == -1) /* no previous in range */ 2074 i = a; 2075 else { /* check that range is valid */ 2076 if (i > a) 2077 errx(EX_DATAERR, "invalid range %d-%d", 2078 i+low, a+low); 2079 if (*s == '-') 2080 errx(EX_DATAERR, "double '-' in range"); 2081 } 2082 for (; i <= a; i++) 2083 map[i/32] |= 1<<(i & 31); 2084 i = -1; 2085 if (*s == '-') 2086 i = a; 2087 else if (*s == '}') 2088 break; 2089 av = s+1; 2090 } 2091 return; 2092 } 2093 av = p; 2094 if (av) /* then *av must be a ',' */ 2095 av++; 2096 2097 /* Check this entry */ 2098 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2099 /* 2100 * 'any' turns the entire list into a NOP. 2101 * 'not any' never matches, so it is removed from the 2102 * list unless it is the only item, in which case we 2103 * report an error. 2104 */ 2105 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2106 if (av == NULL && len == 0) /* only this entry */ 2107 errx(EX_DATAERR, "not any never matches"); 2108 } 2109 /* else do nothing and skip this entry */ 2110 return; 2111 } 2112 /* A single IP can be stored in an optimized format */ 2113 if (d[1] == ~0 && av == NULL && len == 0) { 2114 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2115 return; 2116 } 2117 len += 2; /* two words... */ 2118 d += 2; 2119 } /* end while */ 2120 if (len + 1 > F_LEN_MASK) 2121 errx(EX_DATAERR, "address list too long"); 2122 cmd->o.len |= len+1; 2123} 2124 2125 2126/* n2mask sets n bits of the mask */ 2127void 2128n2mask(struct in6_addr *mask, int n) 2129{ 2130 static int minimask[9] = 2131 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2132 u_char *p; 2133 2134 memset(mask, 0, sizeof(struct in6_addr)); 2135 p = (u_char *) mask; 2136 for (; n > 0; p++, n -= 8) { 2137 if (n >= 8) 2138 *p = 0xff; 2139 else 2140 *p = minimask[n]; 2141 } 2142 return; 2143} 2144 2145 2146/* 2147 * helper function to process a set of flags and set bits in the 2148 * appropriate masks. 2149 */ 2150static void 2151fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2152 struct _s_x *flags, char *p) 2153{ 2154 uint8_t set=0, clear=0; 2155 2156 while (p && *p) { 2157 char *q; /* points to the separator */ 2158 int val; 2159 uint8_t *which; /* mask we are working on */ 2160 2161 if (*p == '!') { 2162 p++; 2163 which = &clear; 2164 } else 2165 which = &set; 2166 q = strchr(p, ','); 2167 if (q) 2168 *q++ = '\0'; 2169 val = match_token(flags, p); 2170 if (val <= 0) 2171 errx(EX_DATAERR, "invalid flag %s", p); 2172 *which |= (uint8_t)val; 2173 p = q; 2174 } 2175 cmd->opcode = opcode; 2176 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2177 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2178} 2179 2180 2181void 2182ipfw_delete(int ac, char *av[]) 2183{ 2184 uint32_t rulenum; 2185 int i; 2186 int exitval = EX_OK; 2187 int do_set = 0; 2188 2189 2190 av++; ac--; 2191 NEED1("missing rule specification"); 2192 if (ac > 0 && _substrcmp(*av, "set") == 0) { 2193 /* Do not allow using the following syntax: 2194 * ipfw set N delete set M 2195 */ 2196 if (co.use_set) 2197 errx(EX_DATAERR, "invalid syntax"); 2198 do_set = 1; /* delete set */ 2199 ac--; av++; 2200 } 2201 2202 /* Rule number */ 2203 while (ac && isdigit(**av)) { 2204 i = atoi(*av); av++; ac--; 2205 if (co.do_nat) { 2206 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 2207 if (exitval) { 2208 exitval = EX_UNAVAILABLE; 2209 warn("rule %u not available", i); 2210 } 2211 } else if (co.do_pipe) { 2212 exitval = ipfw_delete_pipe(co.do_pipe, i); 2213 } else { 2214 if (co.use_set) 2215 rulenum = (i & 0xffff) | (5 << 24) | 2216 ((co.use_set - 1) << 16); 2217 else 2218 rulenum = (i & 0xffff) | (do_set << 24); 2219 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2220 if (i) { 2221 exitval = EX_UNAVAILABLE; 2222 warn("rule %u: setsockopt(IP_FW_DEL)", 2223 rulenum); 2224 } 2225 } 2226 } 2227 if (exitval != EX_OK) 2228 exit(exitval); 2229} 2230 2231 2232/* 2233 * fill the interface structure. We do not check the name as we can 2234 * create interfaces dynamically, so checking them at insert time 2235 * makes relatively little sense. 2236 * Interface names containing '*', '?', or '[' are assumed to be shell 2237 * patterns which match interfaces. 2238 */ 2239static void 2240fill_iface(ipfw_insn_if *cmd, char *arg) 2241{ 2242 cmd->name[0] = '\0'; 2243 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2244 2245 /* Parse the interface or address */ 2246 if (strcmp(arg, "any") == 0) 2247 cmd->o.len = 0; /* effectively ignore this command */ 2248 else if (!isdigit(*arg)) { 2249 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2250 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2251 } else if (!inet_aton(arg, &cmd->p.ip)) 2252 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2253} 2254 2255static void 2256get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 2257{ 2258 int i, l; 2259 char *ap, *ptr, *optr; 2260 struct ether_addr *mac; 2261 const char *macset = "0123456789abcdefABCDEF:"; 2262 2263 if (strcmp(p, "any") == 0) { 2264 for (i = 0; i < ETHER_ADDR_LEN; i++) 2265 addr[i] = mask[i] = 0; 2266 return; 2267 } 2268 2269 optr = ptr = strdup(p); 2270 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 2271 l = strlen(ap); 2272 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 2273 errx(EX_DATAERR, "Incorrect MAC address"); 2274 bcopy(mac, addr, ETHER_ADDR_LEN); 2275 } else 2276 errx(EX_DATAERR, "Incorrect MAC address"); 2277 2278 if (ptr != NULL) { /* we have mask? */ 2279 if (p[ptr - optr - 1] == '/') { /* mask len */ 2280 l = strtol(ptr, &ap, 10); 2281 if (*ap != 0 || l > ETHER_ADDR_LEN * 8 || l < 0) 2282 errx(EX_DATAERR, "Incorrect mask length"); 2283 for (i = 0; l > 0 && i < ETHER_ADDR_LEN; l -= 8, i++) 2284 mask[i] = (l >= 8) ? 0xff: (~0) << (8 - l); 2285 } else { /* mask */ 2286 l = strlen(ptr); 2287 if (strspn(ptr, macset) != l || 2288 (mac = ether_aton(ptr)) == NULL) 2289 errx(EX_DATAERR, "Incorrect mask"); 2290 bcopy(mac, mask, ETHER_ADDR_LEN); 2291 } 2292 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 2293 for (i = 0; i < ETHER_ADDR_LEN; i++) 2294 mask[i] = 0xff; 2295 } 2296 for (i = 0; i < ETHER_ADDR_LEN; i++) 2297 addr[i] &= mask[i]; 2298 2299 free(optr); 2300} 2301 2302/* 2303 * helper function, updates the pointer to cmd with the length 2304 * of the current command, and also cleans up the first word of 2305 * the new command in case it has been clobbered before. 2306 */ 2307static ipfw_insn * 2308next_cmd(ipfw_insn *cmd) 2309{ 2310 cmd += F_LEN(cmd); 2311 bzero(cmd, sizeof(*cmd)); 2312 return cmd; 2313} 2314 2315/* 2316 * Takes arguments and copies them into a comment 2317 */ 2318static void 2319fill_comment(ipfw_insn *cmd, int ac, char **av) 2320{ 2321 int i, l; 2322 char *p = (char *)(cmd + 1); 2323 2324 cmd->opcode = O_NOP; 2325 cmd->len = (cmd->len & (F_NOT | F_OR)); 2326 2327 /* Compute length of comment string. */ 2328 for (i = 0, l = 0; i < ac; i++) 2329 l += strlen(av[i]) + 1; 2330 if (l == 0) 2331 return; 2332 if (l > 84) 2333 errx(EX_DATAERR, 2334 "comment too long (max 80 chars)"); 2335 l = 1 + (l+3)/4; 2336 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2337 for (i = 0; i < ac; i++) { 2338 strcpy(p, av[i]); 2339 p += strlen(av[i]); 2340 *p++ = ' '; 2341 } 2342 *(--p) = '\0'; 2343} 2344 2345/* 2346 * A function to fill simple commands of size 1. 2347 * Existing flags are preserved. 2348 */ 2349static void 2350fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2351{ 2352 cmd->opcode = opcode; 2353 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2354 cmd->arg1 = arg; 2355} 2356 2357/* 2358 * Fetch and add the MAC address and type, with masks. This generates one or 2359 * two microinstructions, and returns the pointer to the last one. 2360 */ 2361static ipfw_insn * 2362add_mac(ipfw_insn *cmd, int ac, char *av[]) 2363{ 2364 ipfw_insn_mac *mac; 2365 2366 if (ac < 2) 2367 errx(EX_DATAERR, "MAC dst src"); 2368 2369 cmd->opcode = O_MACADDR2; 2370 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2371 2372 mac = (ipfw_insn_mac *)cmd; 2373 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2374 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 2375 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 2376 return cmd; 2377} 2378 2379static ipfw_insn * 2380add_mactype(ipfw_insn *cmd, int ac, char *av) 2381{ 2382 if (ac < 1) 2383 errx(EX_DATAERR, "missing MAC type"); 2384 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2385 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2386 cmd->opcode = O_MAC_TYPE; 2387 return cmd; 2388 } else 2389 return NULL; 2390} 2391 2392static ipfw_insn * 2393add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 2394{ 2395 struct protoent *pe; 2396 char *ep; 2397 int proto; 2398 2399 proto = strtol(av, &ep, 10); 2400 if (*ep != '\0' || proto <= 0) { 2401 if ((pe = getprotobyname(av)) == NULL) 2402 return NULL; 2403 proto = pe->p_proto; 2404 } 2405 2406 fill_cmd(cmd, O_PROTO, 0, proto); 2407 *protop = proto; 2408 return cmd; 2409} 2410 2411static ipfw_insn * 2412add_proto(ipfw_insn *cmd, char *av, u_char *protop) 2413{ 2414 u_char proto = IPPROTO_IP; 2415 2416 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2417 ; /* do not set O_IP4 nor O_IP6 */ 2418 else if (strcmp(av, "ip4") == 0) 2419 /* explicit "just IPv4" rule */ 2420 fill_cmd(cmd, O_IP4, 0, 0); 2421 else if (strcmp(av, "ip6") == 0) { 2422 /* explicit "just IPv6" rule */ 2423 proto = IPPROTO_IPV6; 2424 fill_cmd(cmd, O_IP6, 0, 0); 2425 } else 2426 return add_proto0(cmd, av, protop); 2427 2428 *protop = proto; 2429 return cmd; 2430} 2431 2432static ipfw_insn * 2433add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 2434{ 2435 u_char proto = IPPROTO_IP; 2436 2437 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 2438 ; /* do not set O_IP4 nor O_IP6 */ 2439 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 2440 /* explicit "just IPv4" rule */ 2441 fill_cmd(cmd, O_IP4, 0, 0); 2442 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 2443 /* explicit "just IPv6" rule */ 2444 proto = IPPROTO_IPV6; 2445 fill_cmd(cmd, O_IP6, 0, 0); 2446 } else 2447 return add_proto0(cmd, av, protop); 2448 2449 *protop = proto; 2450 return cmd; 2451} 2452 2453static ipfw_insn * 2454add_srcip(ipfw_insn *cmd, char *av) 2455{ 2456 fill_ip((ipfw_insn_ip *)cmd, av); 2457 if (cmd->opcode == O_IP_DST_SET) /* set */ 2458 cmd->opcode = O_IP_SRC_SET; 2459 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2460 cmd->opcode = O_IP_SRC_LOOKUP; 2461 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2462 cmd->opcode = O_IP_SRC_ME; 2463 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2464 cmd->opcode = O_IP_SRC; 2465 else /* addr/mask */ 2466 cmd->opcode = O_IP_SRC_MASK; 2467 return cmd; 2468} 2469 2470static ipfw_insn * 2471add_dstip(ipfw_insn *cmd, char *av) 2472{ 2473 fill_ip((ipfw_insn_ip *)cmd, av); 2474 if (cmd->opcode == O_IP_DST_SET) /* set */ 2475 ; 2476 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2477 ; 2478 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2479 cmd->opcode = O_IP_DST_ME; 2480 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2481 cmd->opcode = O_IP_DST; 2482 else /* addr/mask */ 2483 cmd->opcode = O_IP_DST_MASK; 2484 return cmd; 2485} 2486 2487static ipfw_insn * 2488add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2489{ 2490 if (_substrcmp(av, "any") == 0) { 2491 return NULL; 2492 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2493 /* XXX todo: check that we have a protocol with ports */ 2494 cmd->opcode = opcode; 2495 return cmd; 2496 } 2497 return NULL; 2498} 2499 2500static ipfw_insn * 2501add_src(ipfw_insn *cmd, char *av, u_char proto) 2502{ 2503 struct in6_addr a; 2504 char *host, *ch; 2505 ipfw_insn *ret = NULL; 2506 2507 if ((host = strdup(av)) == NULL) 2508 return NULL; 2509 if ((ch = strrchr(host, '/')) != NULL) 2510 *ch = '\0'; 2511 2512 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2513 inet_pton(AF_INET6, host, &a)) 2514 ret = add_srcip6(cmd, av); 2515 /* XXX: should check for IPv4, not !IPv6 */ 2516 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2517 !inet_pton(AF_INET6, host, &a))) 2518 ret = add_srcip(cmd, av); 2519 if (ret == NULL && strcmp(av, "any") != 0) 2520 ret = cmd; 2521 2522 free(host); 2523 return ret; 2524} 2525 2526static ipfw_insn * 2527add_dst(ipfw_insn *cmd, char *av, u_char proto) 2528{ 2529 struct in6_addr a; 2530 char *host, *ch; 2531 ipfw_insn *ret = NULL; 2532 2533 if ((host = strdup(av)) == NULL) 2534 return NULL; 2535 if ((ch = strrchr(host, '/')) != NULL) 2536 *ch = '\0'; 2537 2538 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 2539 inet_pton(AF_INET6, host, &a)) 2540 ret = add_dstip6(cmd, av); 2541 /* XXX: should check for IPv4, not !IPv6 */ 2542 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 2543 !inet_pton(AF_INET6, host, &a))) 2544 ret = add_dstip(cmd, av); 2545 if (ret == NULL && strcmp(av, "any") != 0) 2546 ret = cmd; 2547 2548 free(host); 2549 return ret; 2550} 2551 2552/* 2553 * Parse arguments and assemble the microinstructions which make up a rule. 2554 * Rules are added into the 'rulebuf' and then copied in the correct order 2555 * into the actual rule. 2556 * 2557 * The syntax for a rule starts with the action, followed by 2558 * optional action parameters, and the various match patterns. 2559 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2560 * (generated if the rule includes a keep-state option), then the 2561 * various match patterns, log/altq actions, and the actual action. 2562 * 2563 */ 2564void 2565ipfw_add(int ac, char *av[]) 2566{ 2567 /* 2568 * rules are added into the 'rulebuf' and then copied in 2569 * the correct order into the actual rule. 2570 * Some things that need to go out of order (prob, action etc.) 2571 * go into actbuf[]. 2572 */ 2573 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2574 2575 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2576 ipfw_insn *first_cmd; /* first match pattern */ 2577 2578 struct ip_fw *rule; 2579 2580 /* 2581 * various flags used to record that we entered some fields. 2582 */ 2583 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2584 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 2585 size_t len; 2586 2587 int i; 2588 2589 int open_par = 0; /* open parenthesis ( */ 2590 2591 /* proto is here because it is used to fetch ports */ 2592 u_char proto = IPPROTO_IP; /* default protocol */ 2593 2594 double match_prob = 1; /* match probability, default is always match */ 2595 2596 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2597 bzero(cmdbuf, sizeof(cmdbuf)); 2598 bzero(rulebuf, sizeof(rulebuf)); 2599 2600 rule = (struct ip_fw *)rulebuf; 2601 cmd = (ipfw_insn *)cmdbuf; 2602 action = (ipfw_insn *)actbuf; 2603 2604 av++; ac--; 2605 2606 /* [rule N] -- Rule number optional */ 2607 if (ac && isdigit(**av)) { 2608 rule->rulenum = atoi(*av); 2609 av++; 2610 ac--; 2611 } 2612 2613 /* [set N] -- set number (0..RESVD_SET), optional */ 2614 if (ac > 1 && _substrcmp(*av, "set") == 0) { 2615 int set = strtoul(av[1], NULL, 10); 2616 if (set < 0 || set > RESVD_SET) 2617 errx(EX_DATAERR, "illegal set %s", av[1]); 2618 rule->set = set; 2619 av += 2; ac -= 2; 2620 } 2621 2622 /* [prob D] -- match probability, optional */ 2623 if (ac > 1 && _substrcmp(*av, "prob") == 0) { 2624 match_prob = strtod(av[1], NULL); 2625 2626 if (match_prob <= 0 || match_prob > 1) 2627 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2628 av += 2; ac -= 2; 2629 } 2630 2631 /* action -- mandatory */ 2632 NEED1("missing action"); 2633 i = match_token(rule_actions, *av); 2634 ac--; av++; 2635 action->len = 1; /* default */ 2636 switch(i) { 2637 case TOK_CHECKSTATE: 2638 have_state = action; 2639 action->opcode = O_CHECK_STATE; 2640 break; 2641 2642 case TOK_ACCEPT: 2643 action->opcode = O_ACCEPT; 2644 break; 2645 2646 case TOK_DENY: 2647 action->opcode = O_DENY; 2648 action->arg1 = 0; 2649 break; 2650 2651 case TOK_REJECT: 2652 action->opcode = O_REJECT; 2653 action->arg1 = ICMP_UNREACH_HOST; 2654 break; 2655 2656 case TOK_RESET: 2657 action->opcode = O_REJECT; 2658 action->arg1 = ICMP_REJECT_RST; 2659 break; 2660 2661 case TOK_RESET6: 2662 action->opcode = O_UNREACH6; 2663 action->arg1 = ICMP6_UNREACH_RST; 2664 break; 2665 2666 case TOK_UNREACH: 2667 action->opcode = O_REJECT; 2668 NEED1("missing reject code"); 2669 fill_reject_code(&action->arg1, *av); 2670 ac--; av++; 2671 break; 2672 2673 case TOK_UNREACH6: 2674 action->opcode = O_UNREACH6; 2675 NEED1("missing unreach code"); 2676 fill_unreach6_code(&action->arg1, *av); 2677 ac--; av++; 2678 break; 2679 2680 case TOK_COUNT: 2681 action->opcode = O_COUNT; 2682 break; 2683 2684 case TOK_NAT: 2685 action->opcode = O_NAT; 2686 action->len = F_INSN_SIZE(ipfw_insn_nat); 2687 goto chkarg; 2688 2689 case TOK_QUEUE: 2690 action->opcode = O_QUEUE; 2691 goto chkarg; 2692 case TOK_PIPE: 2693 action->opcode = O_PIPE; 2694 goto chkarg; 2695 case TOK_SKIPTO: 2696 action->opcode = O_SKIPTO; 2697 goto chkarg; 2698 case TOK_NETGRAPH: 2699 action->opcode = O_NETGRAPH; 2700 goto chkarg; 2701 case TOK_NGTEE: 2702 action->opcode = O_NGTEE; 2703 goto chkarg; 2704 case TOK_DIVERT: 2705 action->opcode = O_DIVERT; 2706 goto chkarg; 2707 case TOK_TEE: 2708 action->opcode = O_TEE; 2709chkarg: 2710 if (!ac) 2711 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 2712 if (isdigit(**av)) { 2713 action->arg1 = strtoul(*av, NULL, 10); 2714 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 2715 errx(EX_DATAERR, "illegal argument for %s", 2716 *(av - 1)); 2717 } else if (_substrcmp(*av, "tablearg") == 0) { 2718 action->arg1 = IP_FW_TABLEARG; 2719 } else if (i == TOK_DIVERT || i == TOK_TEE) { 2720 struct servent *s; 2721 setservent(1); 2722 s = getservbyname(av[0], "divert"); 2723 if (s != NULL) 2724 action->arg1 = ntohs(s->s_port); 2725 else 2726 errx(EX_DATAERR, "illegal divert/tee port"); 2727 } else 2728 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 2729 ac--; av++; 2730 break; 2731 2732 case TOK_FORWARD: { 2733 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2734 char *s, *end; 2735 2736 NEED1("missing forward address[:port]"); 2737 2738 action->opcode = O_FORWARD_IP; 2739 action->len = F_INSN_SIZE(ipfw_insn_sa); 2740 2741 /* 2742 * In the kernel we assume AF_INET and use only 2743 * sin_port and sin_addr. Remember to set sin_len as 2744 * the routing code seems to use it too. 2745 */ 2746 p->sa.sin_family = AF_INET; 2747 p->sa.sin_len = sizeof(struct sockaddr_in); 2748 p->sa.sin_port = 0; 2749 /* 2750 * locate the address-port separator (':' or ',') 2751 */ 2752 s = strchr(*av, ':'); 2753 if (s == NULL) 2754 s = strchr(*av, ','); 2755 if (s != NULL) { 2756 *(s++) = '\0'; 2757 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2758 if (s == end) 2759 errx(EX_DATAERR, 2760 "illegal forwarding port ``%s''", s); 2761 p->sa.sin_port = (u_short)i; 2762 } 2763 if (_substrcmp(*av, "tablearg") == 0) 2764 p->sa.sin_addr.s_addr = INADDR_ANY; 2765 else 2766 lookup_host(*av, &(p->sa.sin_addr)); 2767 ac--; av++; 2768 break; 2769 } 2770 case TOK_COMMENT: 2771 /* pretend it is a 'count' rule followed by the comment */ 2772 action->opcode = O_COUNT; 2773 ac++; av--; /* go back... */ 2774 break; 2775 2776 case TOK_SETFIB: 2777 { 2778 int numfibs; 2779 size_t intsize = sizeof(int); 2780 2781 action->opcode = O_SETFIB; 2782 NEED1("missing fib number"); 2783 action->arg1 = strtoul(*av, NULL, 10); 2784 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 2785 errx(EX_DATAERR, "fibs not suported.\n"); 2786 if (action->arg1 >= numfibs) /* Temporary */ 2787 errx(EX_DATAERR, "fib too large.\n"); 2788 ac--; av++; 2789 break; 2790 } 2791 2792 case TOK_REASS: 2793 action->opcode = O_REASS; 2794 break; 2795 2796 default: 2797 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2798 } 2799 action = next_cmd(action); 2800 2801 /* 2802 * [altq queuename] -- altq tag, optional 2803 * [log [logamount N]] -- log, optional 2804 * 2805 * If they exist, it go first in the cmdbuf, but then it is 2806 * skipped in the copy section to the end of the buffer. 2807 */ 2808 while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) { 2809 ac--; av++; 2810 switch (i) { 2811 case TOK_LOG: 2812 { 2813 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2814 int l; 2815 2816 if (have_log) 2817 errx(EX_DATAERR, 2818 "log cannot be specified more than once"); 2819 have_log = (ipfw_insn *)c; 2820 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2821 cmd->opcode = O_LOG; 2822 if (ac && _substrcmp(*av, "logamount") == 0) { 2823 ac--; av++; 2824 NEED1("logamount requires argument"); 2825 l = atoi(*av); 2826 if (l < 0) 2827 errx(EX_DATAERR, 2828 "logamount must be positive"); 2829 c->max_log = l; 2830 ac--; av++; 2831 } else { 2832 len = sizeof(c->max_log); 2833 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 2834 &c->max_log, &len, NULL, 0) == -1) 2835 errx(1, "sysctlbyname(\"%s\")", 2836 "net.inet.ip.fw.verbose_limit"); 2837 } 2838 } 2839 break; 2840 2841 case TOK_ALTQ: 2842 { 2843 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 2844 2845 NEED1("missing altq queue name"); 2846 if (have_altq) 2847 errx(EX_DATAERR, 2848 "altq cannot be specified more than once"); 2849 have_altq = (ipfw_insn *)a; 2850 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 2851 cmd->opcode = O_ALTQ; 2852 a->qid = altq_name_to_qid(*av); 2853 ac--; av++; 2854 } 2855 break; 2856 2857 case TOK_TAG: 2858 case TOK_UNTAG: { 2859 uint16_t tag; 2860 2861 if (have_tag) 2862 errx(EX_USAGE, "tag and untag cannot be " 2863 "specified more than once"); 2864 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 2865 rule_action_params); 2866 have_tag = cmd; 2867 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 2868 ac--; av++; 2869 break; 2870 } 2871 2872 default: 2873 abort(); 2874 } 2875 cmd = next_cmd(cmd); 2876 } 2877 2878 if (have_state) /* must be a check-state, we are done */ 2879 goto done; 2880 2881#define OR_START(target) \ 2882 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2883 if (open_par) \ 2884 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2885 prev = NULL; \ 2886 open_par = 1; \ 2887 if ( (av[0])[1] == '\0') { \ 2888 ac--; av++; \ 2889 } else \ 2890 (*av)++; \ 2891 } \ 2892 target: \ 2893 2894 2895#define CLOSE_PAR \ 2896 if (open_par) { \ 2897 if (ac && ( \ 2898 strcmp(*av, ")") == 0 || \ 2899 strcmp(*av, "}") == 0)) { \ 2900 prev = NULL; \ 2901 open_par = 0; \ 2902 ac--; av++; \ 2903 } else \ 2904 errx(EX_USAGE, "missing \")\"\n"); \ 2905 } 2906 2907#define NOT_BLOCK \ 2908 if (ac && _substrcmp(*av, "not") == 0) { \ 2909 if (cmd->len & F_NOT) \ 2910 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2911 cmd->len |= F_NOT; \ 2912 ac--; av++; \ 2913 } 2914 2915#define OR_BLOCK(target) \ 2916 if (ac && _substrcmp(*av, "or") == 0) { \ 2917 if (prev == NULL || open_par == 0) \ 2918 errx(EX_DATAERR, "invalid OR block"); \ 2919 prev->len |= F_OR; \ 2920 ac--; av++; \ 2921 goto target; \ 2922 } \ 2923 CLOSE_PAR; 2924 2925 first_cmd = cmd; 2926 2927#if 0 2928 /* 2929 * MAC addresses, optional. 2930 * If we have this, we skip the part "proto from src to dst" 2931 * and jump straight to the option parsing. 2932 */ 2933 NOT_BLOCK; 2934 NEED1("missing protocol"); 2935 if (_substrcmp(*av, "MAC") == 0 || 2936 _substrcmp(*av, "mac") == 0) { 2937 ac--; av++; /* the "MAC" keyword */ 2938 add_mac(cmd, ac, av); /* exits in case of errors */ 2939 cmd = next_cmd(cmd); 2940 ac -= 2; av += 2; /* dst-mac and src-mac */ 2941 NOT_BLOCK; 2942 NEED1("missing mac type"); 2943 if (add_mactype(cmd, ac, av[0])) 2944 cmd = next_cmd(cmd); 2945 ac--; av++; /* any or mac-type */ 2946 goto read_options; 2947 } 2948#endif 2949 2950 /* 2951 * protocol, mandatory 2952 */ 2953 OR_START(get_proto); 2954 NOT_BLOCK; 2955 NEED1("missing protocol"); 2956 if (add_proto_compat(cmd, *av, &proto)) { 2957 av++; ac--; 2958 if (F_LEN(cmd) != 0) { 2959 prev = cmd; 2960 cmd = next_cmd(cmd); 2961 } 2962 } else if (first_cmd != cmd) { 2963 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 2964 } else 2965 goto read_options; 2966 OR_BLOCK(get_proto); 2967 2968 /* 2969 * "from", mandatory 2970 */ 2971 if (!ac || _substrcmp(*av, "from") != 0) 2972 errx(EX_USAGE, "missing ``from''"); 2973 ac--; av++; 2974 2975 /* 2976 * source IP, mandatory 2977 */ 2978 OR_START(source_ip); 2979 NOT_BLOCK; /* optional "not" */ 2980 NEED1("missing source address"); 2981 if (add_src(cmd, *av, proto)) { 2982 ac--; av++; 2983 if (F_LEN(cmd) != 0) { /* ! any */ 2984 prev = cmd; 2985 cmd = next_cmd(cmd); 2986 } 2987 } else 2988 errx(EX_USAGE, "bad source address %s", *av); 2989 OR_BLOCK(source_ip); 2990 2991 /* 2992 * source ports, optional 2993 */ 2994 NOT_BLOCK; /* optional "not" */ 2995 if (ac) { 2996 if (_substrcmp(*av, "any") == 0 || 2997 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 2998 ac--; av++; 2999 if (F_LEN(cmd) != 0) 3000 cmd = next_cmd(cmd); 3001 } 3002 } 3003 3004 /* 3005 * "to", mandatory 3006 */ 3007 if (!ac || _substrcmp(*av, "to") != 0) 3008 errx(EX_USAGE, "missing ``to''"); 3009 av++; ac--; 3010 3011 /* 3012 * destination, mandatory 3013 */ 3014 OR_START(dest_ip); 3015 NOT_BLOCK; /* optional "not" */ 3016 NEED1("missing dst address"); 3017 if (add_dst(cmd, *av, proto)) { 3018 ac--; av++; 3019 if (F_LEN(cmd) != 0) { /* ! any */ 3020 prev = cmd; 3021 cmd = next_cmd(cmd); 3022 } 3023 } else 3024 errx( EX_USAGE, "bad destination address %s", *av); 3025 OR_BLOCK(dest_ip); 3026 3027 /* 3028 * dest. ports, optional 3029 */ 3030 NOT_BLOCK; /* optional "not" */ 3031 if (ac) { 3032 if (_substrcmp(*av, "any") == 0 || 3033 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3034 ac--; av++; 3035 if (F_LEN(cmd) != 0) 3036 cmd = next_cmd(cmd); 3037 } 3038 } 3039 3040read_options: 3041 if (ac && first_cmd == cmd) { 3042 /* 3043 * nothing specified so far, store in the rule to ease 3044 * printout later. 3045 */ 3046 rule->_pad = 1; 3047 } 3048 prev = NULL; 3049 while (ac) { 3050 char *s; 3051 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3052 3053 s = *av; 3054 cmd32 = (ipfw_insn_u32 *)cmd; 3055 3056 if (*s == '!') { /* alternate syntax for NOT */ 3057 if (cmd->len & F_NOT) 3058 errx(EX_USAGE, "double \"not\" not allowed\n"); 3059 cmd->len = F_NOT; 3060 s++; 3061 } 3062 i = match_token(rule_options, s); 3063 ac--; av++; 3064 switch(i) { 3065 case TOK_NOT: 3066 if (cmd->len & F_NOT) 3067 errx(EX_USAGE, "double \"not\" not allowed\n"); 3068 cmd->len = F_NOT; 3069 break; 3070 3071 case TOK_OR: 3072 if (open_par == 0 || prev == NULL) 3073 errx(EX_USAGE, "invalid \"or\" block\n"); 3074 prev->len |= F_OR; 3075 break; 3076 3077 case TOK_STARTBRACE: 3078 if (open_par) 3079 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3080 open_par = 1; 3081 break; 3082 3083 case TOK_ENDBRACE: 3084 if (!open_par) 3085 errx(EX_USAGE, "+missing \")\"\n"); 3086 open_par = 0; 3087 prev = NULL; 3088 break; 3089 3090 case TOK_IN: 3091 fill_cmd(cmd, O_IN, 0, 0); 3092 break; 3093 3094 case TOK_OUT: 3095 cmd->len ^= F_NOT; /* toggle F_NOT */ 3096 fill_cmd(cmd, O_IN, 0, 0); 3097 break; 3098 3099 case TOK_DIVERTED: 3100 fill_cmd(cmd, O_DIVERTED, 0, 3); 3101 break; 3102 3103 case TOK_DIVERTEDLOOPBACK: 3104 fill_cmd(cmd, O_DIVERTED, 0, 1); 3105 break; 3106 3107 case TOK_DIVERTEDOUTPUT: 3108 fill_cmd(cmd, O_DIVERTED, 0, 2); 3109 break; 3110 3111 case TOK_FRAG: 3112 fill_cmd(cmd, O_FRAG, 0, 0); 3113 break; 3114 3115 case TOK_LAYER2: 3116 fill_cmd(cmd, O_LAYER2, 0, 0); 3117 break; 3118 3119 case TOK_XMIT: 3120 case TOK_RECV: 3121 case TOK_VIA: 3122 NEED1("recv, xmit, via require interface name" 3123 " or address"); 3124 fill_iface((ipfw_insn_if *)cmd, av[0]); 3125 ac--; av++; 3126 if (F_LEN(cmd) == 0) /* not a valid address */ 3127 break; 3128 if (i == TOK_XMIT) 3129 cmd->opcode = O_XMIT; 3130 else if (i == TOK_RECV) 3131 cmd->opcode = O_RECV; 3132 else if (i == TOK_VIA) 3133 cmd->opcode = O_VIA; 3134 break; 3135 3136 case TOK_ICMPTYPES: 3137 NEED1("icmptypes requires list of types"); 3138 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3139 av++; ac--; 3140 break; 3141 3142 case TOK_ICMP6TYPES: 3143 NEED1("icmptypes requires list of types"); 3144 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); 3145 av++; ac--; 3146 break; 3147 3148 case TOK_IPTTL: 3149 NEED1("ipttl requires TTL"); 3150 if (strpbrk(*av, "-,")) { 3151 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3152 errx(EX_DATAERR, "invalid ipttl %s", *av); 3153 } else 3154 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3155 ac--; av++; 3156 break; 3157 3158 case TOK_IPID: 3159 NEED1("ipid requires id"); 3160 if (strpbrk(*av, "-,")) { 3161 if (!add_ports(cmd, *av, 0, O_IPID)) 3162 errx(EX_DATAERR, "invalid ipid %s", *av); 3163 } else 3164 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3165 ac--; av++; 3166 break; 3167 3168 case TOK_IPLEN: 3169 NEED1("iplen requires length"); 3170 if (strpbrk(*av, "-,")) { 3171 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3172 errx(EX_DATAERR, "invalid ip len %s", *av); 3173 } else 3174 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3175 ac--; av++; 3176 break; 3177 3178 case TOK_IPVER: 3179 NEED1("ipver requires version"); 3180 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3181 ac--; av++; 3182 break; 3183 3184 case TOK_IPPRECEDENCE: 3185 NEED1("ipprecedence requires value"); 3186 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3187 (strtoul(*av, NULL, 0) & 7) << 5); 3188 ac--; av++; 3189 break; 3190 3191 case TOK_IPOPTS: 3192 NEED1("missing argument for ipoptions"); 3193 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3194 ac--; av++; 3195 break; 3196 3197 case TOK_IPTOS: 3198 NEED1("missing argument for iptos"); 3199 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3200 ac--; av++; 3201 break; 3202 3203 case TOK_UID: 3204 NEED1("uid requires argument"); 3205 { 3206 char *end; 3207 uid_t uid; 3208 struct passwd *pwd; 3209 3210 cmd->opcode = O_UID; 3211 uid = strtoul(*av, &end, 0); 3212 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3213 if (pwd == NULL) 3214 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3215 cmd32->d[0] = pwd->pw_uid; 3216 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3217 ac--; av++; 3218 } 3219 break; 3220 3221 case TOK_GID: 3222 NEED1("gid requires argument"); 3223 { 3224 char *end; 3225 gid_t gid; 3226 struct group *grp; 3227 3228 cmd->opcode = O_GID; 3229 gid = strtoul(*av, &end, 0); 3230 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3231 if (grp == NULL) 3232 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3233 cmd32->d[0] = grp->gr_gid; 3234 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3235 ac--; av++; 3236 } 3237 break; 3238 3239 case TOK_JAIL: 3240 NEED1("jail requires argument"); 3241 { 3242 char *end; 3243 int jid; 3244 3245 cmd->opcode = O_JAIL; 3246 jid = (int)strtol(*av, &end, 0); 3247 if (jid < 0 || *end != '\0') 3248 errx(EX_DATAERR, "jail requires prison ID"); 3249 cmd32->d[0] = (uint32_t)jid; 3250 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3251 ac--; av++; 3252 } 3253 break; 3254 3255 case TOK_ESTAB: 3256 fill_cmd(cmd, O_ESTAB, 0, 0); 3257 break; 3258 3259 case TOK_SETUP: 3260 fill_cmd(cmd, O_TCPFLAGS, 0, 3261 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3262 break; 3263 3264 case TOK_TCPDATALEN: 3265 NEED1("tcpdatalen requires length"); 3266 if (strpbrk(*av, "-,")) { 3267 if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) 3268 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 3269 } else 3270 fill_cmd(cmd, O_TCPDATALEN, 0, 3271 strtoul(*av, NULL, 0)); 3272 ac--; av++; 3273 break; 3274 3275 case TOK_TCPOPTS: 3276 NEED1("missing argument for tcpoptions"); 3277 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3278 ac--; av++; 3279 break; 3280 3281 case TOK_TCPSEQ: 3282 case TOK_TCPACK: 3283 NEED1("tcpseq/tcpack requires argument"); 3284 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3285 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3286 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3287 ac--; av++; 3288 break; 3289 3290 case TOK_TCPWIN: 3291 NEED1("tcpwin requires length"); 3292 fill_cmd(cmd, O_TCPWIN, 0, 3293 htons(strtoul(*av, NULL, 0))); 3294 ac--; av++; 3295 break; 3296 3297 case TOK_TCPFLAGS: 3298 NEED1("missing argument for tcpflags"); 3299 cmd->opcode = O_TCPFLAGS; 3300 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3301 ac--; av++; 3302 break; 3303 3304 case TOK_KEEPSTATE: 3305 if (open_par) 3306 errx(EX_USAGE, "keep-state cannot be part " 3307 "of an or block"); 3308 if (have_state) 3309 errx(EX_USAGE, "only one of keep-state " 3310 "and limit is allowed"); 3311 have_state = cmd; 3312 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3313 break; 3314 3315 case TOK_LIMIT: { 3316 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3317 int val; 3318 3319 if (open_par) 3320 errx(EX_USAGE, 3321 "limit cannot be part of an or block"); 3322 if (have_state) 3323 errx(EX_USAGE, "only one of keep-state and " 3324 "limit is allowed"); 3325 have_state = cmd; 3326 3327 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3328 cmd->opcode = O_LIMIT; 3329 c->limit_mask = c->conn_limit = 0; 3330 3331 while (ac > 0) { 3332 if ((val = match_token(limit_masks, *av)) <= 0) 3333 break; 3334 c->limit_mask |= val; 3335 ac--; av++; 3336 } 3337 3338 if (c->limit_mask == 0) 3339 errx(EX_USAGE, "limit: missing limit mask"); 3340 3341 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 3342 TOK_LIMIT, rule_options); 3343 3344 ac--; av++; 3345 break; 3346 } 3347 3348 case TOK_PROTO: 3349 NEED1("missing protocol"); 3350 if (add_proto(cmd, *av, &proto)) { 3351 ac--; av++; 3352 } else 3353 errx(EX_DATAERR, "invalid protocol ``%s''", 3354 *av); 3355 break; 3356 3357 case TOK_SRCIP: 3358 NEED1("missing source IP"); 3359 if (add_srcip(cmd, *av)) { 3360 ac--; av++; 3361 } 3362 break; 3363 3364 case TOK_DSTIP: 3365 NEED1("missing destination IP"); 3366 if (add_dstip(cmd, *av)) { 3367 ac--; av++; 3368 } 3369 break; 3370 3371 case TOK_SRCIP6: 3372 NEED1("missing source IP6"); 3373 if (add_srcip6(cmd, *av)) { 3374 ac--; av++; 3375 } 3376 break; 3377 3378 case TOK_DSTIP6: 3379 NEED1("missing destination IP6"); 3380 if (add_dstip6(cmd, *av)) { 3381 ac--; av++; 3382 } 3383 break; 3384 3385 case TOK_SRCPORT: 3386 NEED1("missing source port"); 3387 if (_substrcmp(*av, "any") == 0 || 3388 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3389 ac--; av++; 3390 } else 3391 errx(EX_DATAERR, "invalid source port %s", *av); 3392 break; 3393 3394 case TOK_DSTPORT: 3395 NEED1("missing destination port"); 3396 if (_substrcmp(*av, "any") == 0 || 3397 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3398 ac--; av++; 3399 } else 3400 errx(EX_DATAERR, "invalid destination port %s", 3401 *av); 3402 break; 3403 3404 case TOK_MAC: 3405 if (add_mac(cmd, ac, av)) { 3406 ac -= 2; av += 2; 3407 } 3408 break; 3409 3410 case TOK_MACTYPE: 3411 NEED1("missing mac type"); 3412 if (!add_mactype(cmd, ac, *av)) 3413 errx(EX_DATAERR, "invalid mac type %s", *av); 3414 ac--; av++; 3415 break; 3416 3417 case TOK_VERREVPATH: 3418 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3419 break; 3420 3421 case TOK_VERSRCREACH: 3422 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3423 break; 3424 3425 case TOK_ANTISPOOF: 3426 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 3427 break; 3428 3429 case TOK_IPSEC: 3430 fill_cmd(cmd, O_IPSEC, 0, 0); 3431 break; 3432 3433 case TOK_IPV6: 3434 fill_cmd(cmd, O_IP6, 0, 0); 3435 break; 3436 3437 case TOK_IPV4: 3438 fill_cmd(cmd, O_IP4, 0, 0); 3439 break; 3440 3441 case TOK_EXT6HDR: 3442 fill_ext6hdr( cmd, *av ); 3443 ac--; av++; 3444 break; 3445 3446 case TOK_FLOWID: 3447 if (proto != IPPROTO_IPV6 ) 3448 errx( EX_USAGE, "flow-id filter is active " 3449 "only for ipv6 protocol\n"); 3450 fill_flow6( (ipfw_insn_u32 *) cmd, *av ); 3451 ac--; av++; 3452 break; 3453 3454 case TOK_COMMENT: 3455 fill_comment(cmd, ac, av); 3456 av += ac; 3457 ac = 0; 3458 break; 3459 3460 case TOK_TAGGED: 3461 if (ac > 0 && strpbrk(*av, "-,")) { 3462 if (!add_ports(cmd, *av, 0, O_TAGGED)) 3463 errx(EX_DATAERR, "tagged: invalid tag" 3464 " list: %s", *av); 3465 } 3466 else { 3467 uint16_t tag; 3468 3469 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 3470 TOK_TAGGED, rule_options); 3471 fill_cmd(cmd, O_TAGGED, 0, tag); 3472 } 3473 ac--; av++; 3474 break; 3475 3476 case TOK_FIB: 3477 NEED1("fib requires fib number"); 3478 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 3479 ac--; av++; 3480 break; 3481 3482 default: 3483 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3484 } 3485 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3486 prev = cmd; 3487 cmd = next_cmd(cmd); 3488 } 3489 } 3490 3491done: 3492 /* 3493 * Now copy stuff into the rule. 3494 * If we have a keep-state option, the first instruction 3495 * must be a PROBE_STATE (which is generated here). 3496 * If we have a LOG option, it was stored as the first command, 3497 * and now must be moved to the top of the action part. 3498 */ 3499 dst = (ipfw_insn *)rule->cmd; 3500 3501 /* 3502 * First thing to write into the command stream is the match probability. 3503 */ 3504 if (match_prob != 1) { /* 1 means always match */ 3505 dst->opcode = O_PROB; 3506 dst->len = 2; 3507 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3508 dst += dst->len; 3509 } 3510 3511 /* 3512 * generate O_PROBE_STATE if necessary 3513 */ 3514 if (have_state && have_state->opcode != O_CHECK_STATE) { 3515 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3516 dst = next_cmd(dst); 3517 } 3518 3519 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 3520 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3521 i = F_LEN(src); 3522 3523 switch (src->opcode) { 3524 case O_LOG: 3525 case O_KEEP_STATE: 3526 case O_LIMIT: 3527 case O_ALTQ: 3528 case O_TAG: 3529 break; 3530 default: 3531 bcopy(src, dst, i * sizeof(uint32_t)); 3532 dst += i; 3533 } 3534 } 3535 3536 /* 3537 * put back the have_state command as last opcode 3538 */ 3539 if (have_state && have_state->opcode != O_CHECK_STATE) { 3540 i = F_LEN(have_state); 3541 bcopy(have_state, dst, i * sizeof(uint32_t)); 3542 dst += i; 3543 } 3544 /* 3545 * start action section 3546 */ 3547 rule->act_ofs = dst - rule->cmd; 3548 3549 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 3550 if (have_log) { 3551 i = F_LEN(have_log); 3552 bcopy(have_log, dst, i * sizeof(uint32_t)); 3553 dst += i; 3554 } 3555 if (have_altq) { 3556 i = F_LEN(have_altq); 3557 bcopy(have_altq, dst, i * sizeof(uint32_t)); 3558 dst += i; 3559 } 3560 if (have_tag) { 3561 i = F_LEN(have_tag); 3562 bcopy(have_tag, dst, i * sizeof(uint32_t)); 3563 dst += i; 3564 } 3565 /* 3566 * copy all other actions 3567 */ 3568 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3569 i = F_LEN(src); 3570 bcopy(src, dst, i * sizeof(uint32_t)); 3571 dst += i; 3572 } 3573 3574 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3575 i = (char *)dst - (char *)rule; 3576 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3577 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3578 if (!co.do_quiet) 3579 show_ipfw(rule, 0, 0); 3580} 3581 3582/* 3583 * clear the counters or the log counters. 3584 */ 3585void 3586ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */) 3587{ 3588 uint32_t arg, saved_arg; 3589 int failed = EX_OK; 3590 char const *errstr; 3591 char const *name = optname ? "RESETLOG" : "ZERO"; 3592 3593 optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO; 3594 3595 av++; ac--; 3596 3597 if (!ac) { 3598 /* clear all entries */ 3599 if (do_cmd(optname, NULL, 0) < 0) 3600 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3601 if (!co.do_quiet) 3602 printf("%s.\n", optname == IP_FW_ZERO ? 3603 "Accounting cleared":"Logging counts reset"); 3604 3605 return; 3606 } 3607 3608 while (ac) { 3609 /* Rule number */ 3610 if (isdigit(**av)) { 3611 arg = strtonum(*av, 0, 0xffff, &errstr); 3612 if (errstr) 3613 errx(EX_DATAERR, 3614 "invalid rule number %s\n", *av); 3615 saved_arg = arg; 3616 if (co.use_set) 3617 arg |= (1 << 24) | ((co.use_set - 1) << 16); 3618 av++; 3619 ac--; 3620 if (do_cmd(optname, &arg, sizeof(arg))) { 3621 warn("rule %u: setsockopt(IP_FW_%s)", 3622 saved_arg, name); 3623 failed = EX_UNAVAILABLE; 3624 } else if (!co.do_quiet) 3625 printf("Entry %d %s.\n", saved_arg, 3626 optname == IP_FW_ZERO ? 3627 "cleared" : "logging count reset"); 3628 } else { 3629 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3630 } 3631 } 3632 if (failed != EX_OK) 3633 exit(failed); 3634} 3635 3636void 3637ipfw_flush(int force) 3638{ 3639 int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3640 3641 if (!force && !co.do_quiet) { /* need to ask user */ 3642 int c; 3643 3644 printf("Are you sure? [yn] "); 3645 fflush(stdout); 3646 do { 3647 c = toupper(getc(stdin)); 3648 while (c != '\n' && getc(stdin) != '\n') 3649 if (feof(stdin)) 3650 return; /* and do not flush */ 3651 } while (c != 'Y' && c != 'N'); 3652 printf("\n"); 3653 if (c == 'N') /* user said no */ 3654 return; 3655 } 3656 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 3657 if (co.use_set) { 3658 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24); 3659 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0) 3660 err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)"); 3661 } else if (do_cmd(cmd, NULL, 0) < 0) 3662 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3663 co.do_pipe ? "DUMMYNET" : "FW"); 3664 if (!co.do_quiet) 3665 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 3666} 3667 3668 3669static void table_list(ipfw_table_entry ent, int need_header); 3670 3671/* 3672 * This one handles all table-related commands 3673 * ipfw table N add addr[/masklen] [value] 3674 * ipfw table N delete addr[/masklen] 3675 * ipfw table {N | all} flush 3676 * ipfw table {N | all} list 3677 */ 3678void 3679ipfw_table_handler(int ac, char *av[]) 3680{ 3681 ipfw_table_entry ent; 3682 int do_add; 3683 int is_all; 3684 size_t len; 3685 char *p; 3686 uint32_t a; 3687 uint32_t tables_max; 3688 3689 len = sizeof(tables_max); 3690 if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len, 3691 NULL, 0) == -1) { 3692#ifdef IPFW_TABLES_MAX 3693 warn("Warn: Failed to get the max tables number via sysctl. " 3694 "Using the compiled in defaults. \nThe reason was"); 3695 tables_max = IPFW_TABLES_MAX; 3696#else 3697 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")"); 3698#endif 3699 } 3700 3701 ac--; av++; 3702 if (ac && isdigit(**av)) { 3703 ent.tbl = atoi(*av); 3704 is_all = 0; 3705 ac--; av++; 3706 } else if (ac && _substrcmp(*av, "all") == 0) { 3707 ent.tbl = 0; 3708 is_all = 1; 3709 ac--; av++; 3710 } else 3711 errx(EX_USAGE, "table number or 'all' keyword required"); 3712 if (ent.tbl >= tables_max) 3713 errx(EX_USAGE, "The table number exceeds the maximum allowed " 3714 "value (%d)", tables_max - 1); 3715 NEED1("table needs command"); 3716 if (is_all && _substrcmp(*av, "list") != 0 3717 && _substrcmp(*av, "flush") != 0) 3718 errx(EX_USAGE, "table number required"); 3719 3720 if (_substrcmp(*av, "add") == 0 || 3721 _substrcmp(*av, "delete") == 0) { 3722 do_add = **av == 'a'; 3723 ac--; av++; 3724 if (!ac) 3725 errx(EX_USAGE, "IP address required"); 3726 p = strchr(*av, '/'); 3727 if (p) { 3728 *p++ = '\0'; 3729 ent.masklen = atoi(p); 3730 if (ent.masklen > 32) 3731 errx(EX_DATAERR, "bad width ``%s''", p); 3732 } else 3733 ent.masklen = 32; 3734 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3735 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3736 ac--; av++; 3737 if (do_add && ac) { 3738 unsigned int tval; 3739 /* isdigit is a bit of a hack here.. */ 3740 if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { 3741 ent.value = strtoul(*av, NULL, 0); 3742 } else { 3743 if (lookup_host(*av, (struct in_addr *)&tval) == 0) { 3744 /* The value must be stored in host order * 3745 * so that the values < 65k can be distinguished */ 3746 ent.value = ntohl(tval); 3747 } else { 3748 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3749 } 3750 } 3751 } else 3752 ent.value = 0; 3753 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3754 &ent, sizeof(ent)) < 0) { 3755 /* If running silent, don't bomb out on these errors. */ 3756 if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) 3757 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3758 do_add ? "ADD" : "DEL"); 3759 /* In silent mode, react to a failed add by deleting */ 3760 if (do_add) { 3761 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); 3762 if (do_cmd(IP_FW_TABLE_ADD, 3763 &ent, sizeof(ent)) < 0) 3764 err(EX_OSERR, 3765 "setsockopt(IP_FW_TABLE_ADD)"); 3766 } 3767 } 3768 } else if (_substrcmp(*av, "flush") == 0) { 3769 a = is_all ? tables_max : (ent.tbl + 1); 3770 do { 3771 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, 3772 sizeof(ent.tbl)) < 0) 3773 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3774 } while (++ent.tbl < a); 3775 } else if (_substrcmp(*av, "list") == 0) { 3776 a = is_all ? tables_max : (ent.tbl + 1); 3777 do { 3778 table_list(ent, is_all); 3779 } while (++ent.tbl < a); 3780 } else 3781 errx(EX_USAGE, "invalid table command %s", *av); 3782} 3783 3784static void 3785table_list(ipfw_table_entry ent, int need_header) 3786{ 3787 ipfw_table *tbl; 3788 socklen_t l; 3789 uint32_t a; 3790 3791 a = ent.tbl; 3792 l = sizeof(a); 3793 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3794 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3795 3796 /* If a is zero we have nothing to do, the table is empty. */ 3797 if (a == 0) 3798 return; 3799 3800 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3801 tbl = safe_calloc(1, l); 3802 tbl->tbl = ent.tbl; 3803 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3804 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3805 if (tbl->cnt && need_header) 3806 printf("---table(%d)---\n", tbl->tbl); 3807 for (a = 0; a < tbl->cnt; a++) { 3808 unsigned int tval; 3809 tval = tbl->ent[a].value; 3810 if (co.do_value_as_ip) { 3811 char tbuf[128]; 3812 strncpy(tbuf, inet_ntoa(*(struct in_addr *) 3813 &tbl->ent[a].addr), 127); 3814 /* inet_ntoa expects network order */ 3815 tval = htonl(tval); 3816 printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, 3817 inet_ntoa(*(struct in_addr *)&tval)); 3818 } else { 3819 printf("%s/%u %u\n", 3820 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3821 tbl->ent[a].masklen, tval); 3822 } 3823 } 3824 free(tbl); 3825} 3826