1 /* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/types.h> 24 #include <sys/param.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/sysctl.h> 28 29 #include "ipfw2.h" 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <grp.h> 35 #include <netdb.h> 36 #include <pwd.h> 37 #include <stdio.h> 38 #include <stdarg.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <sysexits.h> 42 #include <time.h> /* ctime */ 43 #include <timeconv.h> /* _long_to_time */ 44 #include <unistd.h> 45 #include <fcntl.h> 46 #include <stddef.h> /* offsetof */ 47 48 #include <net/ethernet.h> 49 #include <net/if.h> /* only IFNAMSIZ */ 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> /* only n_short, n_long */ 52 #include <netinet/ip.h> 53 #include <netinet/ip_icmp.h> 54 #include <netinet/ip_fw.h> 55 #include <netinet/tcp.h> 56 #include <arpa/inet.h> 57 58 struct cmdline_opts co; /* global options */ 59 60 struct format_opts { 61 int bcwidth; 62 int pcwidth; 63 int show_counters; 64 int show_time; /* show timestamp */ 65 uint32_t set_mask; /* enabled sets mask */ 66 uint32_t flags; /* request flags */ 67 uint32_t first; /* first rule to request */ 68 uint32_t last; /* last rule to request */ 69 uint32_t dcnt; /* number of dynamic states */ 70 ipfw_obj_ctlv *tstate; /* table state data */ 71 }; 72 73 int resvd_set_number = RESVD_SET; 74 75 int ipfw_socket = -1; 76 77 #define CHECK_LENGTH(v, len) do { \ 78 if ((v) < (len)) \ 79 errx(EX_DATAERR, "Rule too long"); \ 80 } while (0) 81 /* 82 * Check if we have enough space in cmd buffer. Note that since 83 * first 8? u32 words are reserved by reserved header, full cmd 84 * buffer can't be used, so we need to protect from buffer overrun 85 * only. At the beginnig, cblen is less than actual buffer size by 86 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need 87 * for checking small instructions fitting in given range. 88 * We also (ab)use the fact that ipfw_insn is always the first field 89 * for any custom instruction. 90 */ 91 #define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) 92 93 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 94 if (!av[0]) \ 95 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 96 if (_substrcmp(*av, "tablearg") == 0) { \ 97 arg = IP_FW_TARG; \ 98 break; \ 99 } \ 100 \ 101 { \ 102 long _xval; \ 103 char *end; \ 104 \ 105 _xval = strtol(*av, &end, 10); \ 106 \ 107 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 108 errx(EX_DATAERR, "%s: invalid argument: %s", \ 109 match_value(s_x, tok), *av); \ 110 \ 111 if (errno == ERANGE || _xval < min || _xval > max) \ 112 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 113 match_value(s_x, tok), min, max, *av); \ 114 \ 115 if (_xval == IP_FW_TARG) \ 116 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 117 match_value(s_x, tok), *av); \ 118 arg = _xval; \ 119 } \ 120 } while (0) 121 122 static struct _s_x f_tcpflags[] = { 123 { "syn", TH_SYN }, 124 { "fin", TH_FIN }, 125 { "ack", TH_ACK }, 126 { "psh", TH_PUSH }, 127 { "rst", TH_RST }, 128 { "urg", TH_URG }, 129 { "tcp flag", 0 }, 130 { NULL, 0 } 131 }; 132 133 static struct _s_x f_tcpopts[] = { 134 { "mss", IP_FW_TCPOPT_MSS }, 135 { "maxseg", IP_FW_TCPOPT_MSS }, 136 { "window", IP_FW_TCPOPT_WINDOW }, 137 { "sack", IP_FW_TCPOPT_SACK }, 138 { "ts", IP_FW_TCPOPT_TS }, 139 { "timestamp", IP_FW_TCPOPT_TS }, 140 { "cc", IP_FW_TCPOPT_CC }, 141 { "tcp option", 0 }, 142 { NULL, 0 } 143 }; 144 145 /* 146 * IP options span the range 0 to 255 so we need to remap them 147 * (though in fact only the low 5 bits are significant). 148 */ 149 static struct _s_x f_ipopts[] = { 150 { "ssrr", IP_FW_IPOPT_SSRR}, 151 { "lsrr", IP_FW_IPOPT_LSRR}, 152 { "rr", IP_FW_IPOPT_RR}, 153 { "ts", IP_FW_IPOPT_TS}, 154 { "ip option", 0 }, 155 { NULL, 0 } 156 }; 157 158 static struct _s_x f_iptos[] = { 159 { "lowdelay", IPTOS_LOWDELAY}, 160 { "throughput", IPTOS_THROUGHPUT}, 161 { "reliability", IPTOS_RELIABILITY}, 162 { "mincost", IPTOS_MINCOST}, 163 { "congestion", IPTOS_ECN_CE}, 164 { "ecntransport", IPTOS_ECN_ECT0}, 165 { "ip tos option", 0}, 166 { NULL, 0 } 167 }; 168 169 struct _s_x f_ipdscp[] = { 170 { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ 171 { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ 172 { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ 173 { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ 174 { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ 175 { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ 176 { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ 177 { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ 178 { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ 179 { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ 180 { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ 181 { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ 182 { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 183 { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ 184 { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 185 { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ 186 { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ 187 { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ 188 { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ 189 { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ 190 { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ 191 { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ 192 { NULL, 0 } 193 }; 194 195 static struct _s_x limit_masks[] = { 196 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 197 {"src-addr", DYN_SRC_ADDR}, 198 {"src-port", DYN_SRC_PORT}, 199 {"dst-addr", DYN_DST_ADDR}, 200 {"dst-port", DYN_DST_PORT}, 201 {NULL, 0} 202 }; 203 204 /* 205 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 206 * This is only used in this code. 207 */ 208 #define IPPROTO_ETHERTYPE 0x1000 209 static struct _s_x ether_types[] = { 210 /* 211 * Note, we cannot use "-:&/" in the names because they are field 212 * separators in the type specifications. Also, we use s = NULL as 213 * end-delimiter, because a type of 0 can be legal. 214 */ 215 { "ip", 0x0800 }, 216 { "ipv4", 0x0800 }, 217 { "ipv6", 0x86dd }, 218 { "arp", 0x0806 }, 219 { "rarp", 0x8035 }, 220 { "vlan", 0x8100 }, 221 { "loop", 0x9000 }, 222 { "trail", 0x1000 }, 223 { "at", 0x809b }, 224 { "atalk", 0x809b }, 225 { "aarp", 0x80f3 }, 226 { "pppoe_disc", 0x8863 }, 227 { "pppoe_sess", 0x8864 }, 228 { "ipx_8022", 0x00E0 }, 229 { "ipx_8023", 0x0000 }, 230 { "ipx_ii", 0x8137 }, 231 { "ipx_snap", 0x8137 }, 232 { "ipx", 0x8137 }, 233 { "ns", 0x0600 }, 234 { NULL, 0 } 235 }; 236 237 238 static struct _s_x rule_actions[] = { 239 { "accept", TOK_ACCEPT }, 240 { "pass", TOK_ACCEPT }, 241 { "allow", TOK_ACCEPT }, 242 { "permit", TOK_ACCEPT }, 243 { "count", TOK_COUNT }, 244 { "pipe", TOK_PIPE }, 245 { "queue", TOK_QUEUE }, 246 { "divert", TOK_DIVERT }, 247 { "tee", TOK_TEE }, 248 { "netgraph", TOK_NETGRAPH }, 249 { "ngtee", TOK_NGTEE }, 250 { "fwd", TOK_FORWARD }, 251 { "forward", TOK_FORWARD }, 252 { "skipto", TOK_SKIPTO }, 253 { "deny", TOK_DENY }, 254 { "drop", TOK_DENY }, 255 { "reject", TOK_REJECT }, 256 { "reset6", TOK_RESET6 }, 257 { "reset", TOK_RESET }, 258 { "unreach6", TOK_UNREACH6 }, 259 { "unreach", TOK_UNREACH }, 260 { "check-state", TOK_CHECKSTATE }, 261 { "//", TOK_COMMENT }, 262 { "nat", TOK_NAT }, 263 { "reass", TOK_REASS }, 264 { "setfib", TOK_SETFIB }, 265 { "setdscp", TOK_SETDSCP }, 266 { "call", TOK_CALL }, 267 { "return", TOK_RETURN }, 268 { NULL, 0 } /* terminator */ 269 }; 270 271 static struct _s_x rule_action_params[] = { 272 { "altq", TOK_ALTQ }, 273 { "log", TOK_LOG }, 274 { "tag", TOK_TAG }, 275 { "untag", TOK_UNTAG }, 276 { NULL, 0 } /* terminator */ 277 }; 278 279 /* 280 * The 'lookup' instruction accepts one of the following arguments. 281 * -1 is a terminator for the list. 282 * Arguments are passed as v[1] in O_DST_LOOKUP options. 283 */ 284 static int lookup_key[] = { 285 TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, 286 TOK_UID, TOK_JAIL, TOK_DSCP, -1 }; 287 288 static struct _s_x rule_options[] = { 289 { "tagged", TOK_TAGGED }, 290 { "uid", TOK_UID }, 291 { "gid", TOK_GID }, 292 { "jail", TOK_JAIL }, 293 { "in", TOK_IN }, 294 { "limit", TOK_LIMIT }, 295 { "keep-state", TOK_KEEPSTATE }, 296 { "bridged", TOK_LAYER2 }, 297 { "layer2", TOK_LAYER2 }, 298 { "out", TOK_OUT }, 299 { "diverted", TOK_DIVERTED }, 300 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 301 { "diverted-output", TOK_DIVERTEDOUTPUT }, 302 { "xmit", TOK_XMIT }, 303 { "recv", TOK_RECV }, 304 { "via", TOK_VIA }, 305 { "fragment", TOK_FRAG }, 306 { "frag", TOK_FRAG }, 307 { "fib", TOK_FIB }, 308 { "ipoptions", TOK_IPOPTS }, 309 { "ipopts", TOK_IPOPTS }, 310 { "iplen", TOK_IPLEN }, 311 { "ipid", TOK_IPID }, 312 { "ipprecedence", TOK_IPPRECEDENCE }, 313 { "dscp", TOK_DSCP }, 314 { "iptos", TOK_IPTOS }, 315 { "ipttl", TOK_IPTTL }, 316 { "ipversion", TOK_IPVER }, 317 { "ipver", TOK_IPVER }, 318 { "estab", TOK_ESTAB }, 319 { "established", TOK_ESTAB }, 320 { "setup", TOK_SETUP }, 321 { "sockarg", TOK_SOCKARG }, 322 { "tcpdatalen", TOK_TCPDATALEN }, 323 { "tcpflags", TOK_TCPFLAGS }, 324 { "tcpflgs", TOK_TCPFLAGS }, 325 { "tcpoptions", TOK_TCPOPTS }, 326 { "tcpopts", TOK_TCPOPTS }, 327 { "tcpseq", TOK_TCPSEQ }, 328 { "tcpack", TOK_TCPACK }, 329 { "tcpwin", TOK_TCPWIN }, 330 { "icmptype", TOK_ICMPTYPES }, 331 { "icmptypes", TOK_ICMPTYPES }, 332 { "dst-ip", TOK_DSTIP }, 333 { "src-ip", TOK_SRCIP }, 334 { "dst-port", TOK_DSTPORT }, 335 { "src-port", TOK_SRCPORT }, 336 { "proto", TOK_PROTO }, 337 { "MAC", TOK_MAC }, 338 { "mac", TOK_MAC }, 339 { "mac-type", TOK_MACTYPE }, 340 { "verrevpath", TOK_VERREVPATH }, 341 { "versrcreach", TOK_VERSRCREACH }, 342 { "antispoof", TOK_ANTISPOOF }, 343 { "ipsec", TOK_IPSEC }, 344 { "icmp6type", TOK_ICMP6TYPES }, 345 { "icmp6types", TOK_ICMP6TYPES }, 346 { "ext6hdr", TOK_EXT6HDR}, 347 { "flow-id", TOK_FLOWID}, 348 { "ipv6", TOK_IPV6}, 349 { "ip6", TOK_IPV6}, 350 { "ipv4", TOK_IPV4}, 351 { "ip4", TOK_IPV4}, 352 { "dst-ipv6", TOK_DSTIP6}, 353 { "dst-ip6", TOK_DSTIP6}, 354 { "src-ipv6", TOK_SRCIP6}, 355 { "src-ip6", TOK_SRCIP6}, 356 { "lookup", TOK_LOOKUP}, 357 { "flow", TOK_FLOW}, 358 { "//", TOK_COMMENT }, 359 360 { "not", TOK_NOT }, /* pseudo option */ 361 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 362 { "or", TOK_OR }, /* pseudo option */ 363 { "|", /* escape */ TOK_OR }, /* pseudo option */ 364 { "{", TOK_STARTBRACE }, /* pseudo option */ 365 { "(", TOK_STARTBRACE }, /* pseudo option */ 366 { "}", TOK_ENDBRACE }, /* pseudo option */ 367 { ")", TOK_ENDBRACE }, /* pseudo option */ 368 { NULL, 0 } /* terminator */ 369 }; 370 371 void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); 372 static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 373 ipfw_cfg_lheader **pcfg, size_t *psize); 374 static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 375 ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); 376 static void ipfw_list_tifaces(void); 377 378 /* 379 * Simple string buffer API. 380 * Used to simplify buffer passing between function and for 381 * transparent overrun handling. 382 */ 383 384 /* 385 * Allocates new buffer of given size @sz. 386 * 387 * Returns 0 on success. 388 */ 389 int 390 bp_alloc(struct buf_pr *b, size_t size) 391 { 392 memset(b, 0, sizeof(struct buf_pr)); 393 394 if ((b->buf = calloc(1, size)) == NULL) 395 return (ENOMEM); 396 397 b->ptr = b->buf; 398 b->size = size; 399 b->avail = b->size; 400 401 return (0); 402 } 403 404 void 405 bp_free(struct buf_pr *b) 406 { 407 408 free(b->buf); 409 } 410 411 /* 412 * Flushes buffer so new writer start from beginning. 413 */ 414 void 415 bp_flush(struct buf_pr *b) 416 { 417 418 b->ptr = b->buf; 419 b->avail = b->size; 420 } 421 422 /* 423 * Print message specified by @format and args. 424 * Automatically manage buffer space and transparently handle 425 * buffer overruns. 426 * 427 * Returns number of bytes that should have been printed. 428 */ 429 int 430 bprintf(struct buf_pr *b, char *format, ...) 431 { 432 va_list args; 433 int i; 434 435 va_start(args, format); 436 437 i = vsnprintf(b->ptr, b->avail, format, args); 438 va_end(args); 439 440 if (i > b->avail || i < 0) { 441 /* Overflow or print error */ 442 b->avail = 0; 443 } else { 444 b->ptr += i; 445 b->avail -= i; 446 } 447 448 b->needed += i; 449 450 return (i); 451 } 452 453 /* 454 * Special values printer for tablearg-aware opcodes. 455 */ 456 void 457 bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) 458 { 459 460 if (str != NULL) 461 bprintf(bp, "%s", str); 462 if (arg == IP_FW_TARG) 463 bprintf(bp, "tablearg"); 464 else 465 bprintf(bp, "%u", arg); 466 } 467 468 /* 469 * Helper routine to print a possibly unaligned uint64_t on 470 * various platform. If width > 0, print the value with 471 * the desired width, followed by a space; 472 * otherwise, return the required width. 473 */ 474 int 475 pr_u64(struct buf_pr *b, uint64_t *pd, int width) 476 { 477 #ifdef TCC 478 #define U64_FMT "I64" 479 #else 480 #define U64_FMT "llu" 481 #endif 482 uint64_t u; 483 unsigned long long d; 484 485 bcopy (pd, &u, sizeof(u)); 486 d = u; 487 return (width > 0) ? 488 bprintf(b, "%*" U64_FMT " ", width, d) : 489 snprintf(NULL, 0, "%" U64_FMT, d) ; 490 #undef U64_FMT 491 } 492 493 494 void * 495 safe_calloc(size_t number, size_t size) 496 { 497 void *ret = calloc(number, size); 498 499 if (ret == NULL) 500 err(EX_OSERR, "calloc"); 501 return ret; 502 } 503 504 void * 505 safe_realloc(void *ptr, size_t size) 506 { 507 void *ret = realloc(ptr, size); 508 509 if (ret == NULL) 510 err(EX_OSERR, "realloc"); 511 return ret; 512 } 513 514 /* 515 * Compare things like interface or table names. 516 */ 517 int 518 stringnum_cmp(const char *a, const char *b) 519 { 520 int la, lb; 521 522 la = strlen(a); 523 lb = strlen(b); 524 525 if (la > lb) 526 return (1); 527 else if (la < lb) 528 return (-01); 529 530 return (strcmp(a, b)); 531 } 532 533 534 /* 535 * conditionally runs the command. 536 * Selected options or negative -> getsockopt 537 */ 538 int 539 do_cmd(int optname, void *optval, uintptr_t optlen) 540 { 541 int i; 542 543 if (co.test_only) 544 return 0; 545 546 if (ipfw_socket == -1) 547 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 548 if (ipfw_socket < 0) 549 err(EX_UNAVAILABLE, "socket"); 550 551 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 552 optname == IP_FW_ADD || optname == IP_FW3 || 553 optname == IP_FW_NAT_GET_CONFIG || 554 optname < 0 || 555 optname == IP_FW_NAT_GET_LOG) { 556 if (optname < 0) 557 optname = -optname; 558 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 559 (socklen_t *)optlen); 560 } else { 561 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 562 } 563 return i; 564 } 565 566 /* 567 * do_set3 - pass ipfw control cmd to kernel 568 * @optname: option name 569 * @optval: pointer to option data 570 * @optlen: option length 571 * 572 * Assumes op3 header is already embedded. 573 * Calls setsockopt() with IP_FW3 as kernel-visible opcode. 574 * Returns 0 on success or errno otherwise. 575 */ 576 int 577 do_set3(int optname, ip_fw3_opheader *op3, uintptr_t optlen) 578 { 579 580 if (co.test_only) 581 return (0); 582 583 if (ipfw_socket == -1) 584 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 585 if (ipfw_socket < 0) 586 err(EX_UNAVAILABLE, "socket"); 587 588 op3->opcode = optname; 589 590 return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen)); 591 } 592 593 /* 594 * do_get3 - pass ipfw control cmd to kernel 595 * @optname: option name 596 * @optval: pointer to option data 597 * @optlen: pointer to option length 598 * 599 * Assumes op3 header is already embedded. 600 * Calls getsockopt() with IP_FW3 as kernel-visible opcode. 601 * Returns 0 on success or errno otherwise. 602 */ 603 int 604 do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) 605 { 606 int error; 607 608 if (co.test_only) 609 return (0); 610 611 if (ipfw_socket == -1) 612 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 613 if (ipfw_socket < 0) 614 err(EX_UNAVAILABLE, "socket"); 615 616 op3->opcode = optname; 617 618 error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, 619 (socklen_t *)optlen); 620 621 return (error); 622 } 623 624 /** 625 * match_token takes a table and a string, returns the value associated 626 * with the string (-1 in case of failure). 627 */ 628 int 629 match_token(struct _s_x *table, char *string) 630 { 631 struct _s_x *pt; 632 uint i = strlen(string); 633 634 for (pt = table ; i && pt->s != NULL ; pt++) 635 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 636 return pt->x; 637 return (-1); 638 } 639 640 /** 641 * match_token takes a table and a string, returns the value associated 642 * with the string for the best match. 643 * 644 * Returns: 645 * value from @table for matched records 646 * -1 for non-matched records 647 * -2 if more than one records match @string. 648 */ 649 int 650 match_token_relaxed(struct _s_x *table, char *string) 651 { 652 struct _s_x *pt, *m; 653 int i, c; 654 655 i = strlen(string); 656 c = 0; 657 658 for (pt = table ; i != 0 && pt->s != NULL ; pt++) { 659 if (strncmp(pt->s, string, i) != 0) 660 continue; 661 m = pt; 662 c++; 663 } 664 665 if (c == 1) 666 return (m->x); 667 668 return (c > 0 ? -2: -1); 669 } 670 671 /** 672 * match_value takes a table and a value, returns the string associated 673 * with the value (NULL in case of failure). 674 */ 675 char const * 676 match_value(struct _s_x *p, int value) 677 { 678 for (; p->s != NULL; p++) 679 if (p->x == value) 680 return p->s; 681 return NULL; 682 } 683 684 size_t 685 concat_tokens(char *buf, size_t bufsize, struct _s_x *table, char *delimiter) 686 { 687 struct _s_x *pt; 688 int l; 689 size_t sz; 690 691 for (sz = 0, pt = table ; pt->s != NULL; pt++) { 692 l = snprintf(buf + sz, bufsize - sz, "%s%s", 693 (sz == 0) ? "" : delimiter, pt->s); 694 sz += l; 695 bufsize += l; 696 if (sz > bufsize) 697 return (bufsize); 698 } 699 700 return (sz); 701 } 702 703 /* 704 * helper function to process a set of flags and set bits in the 705 * appropriate masks. 706 */ 707 int 708 fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set, 709 uint32_t *clear) 710 { 711 char *q; /* points to the separator */ 712 int val; 713 uint32_t *which; /* mask we are working on */ 714 715 while (p && *p) { 716 if (*p == '!') { 717 p++; 718 which = clear; 719 } else 720 which = set; 721 q = strchr(p, ','); 722 if (q) 723 *q++ = '\0'; 724 val = match_token(flags, p); 725 if (val <= 0) { 726 if (e != NULL) 727 *e = p; 728 return (-1); 729 } 730 *which |= (uint32_t)val; 731 p = q; 732 } 733 return (0); 734 } 735 736 void 737 print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set) 738 { 739 char const *comma = ""; 740 int i, l; 741 742 for (i = 0; list[i].x != 0; i++) { 743 if ((set & list[i].x) == 0) 744 continue; 745 746 set &= ~list[i].x; 747 l = snprintf(buf, sz, "%s%s", comma, list[i].s); 748 if (l >= sz) 749 return; 750 comma = ","; 751 buf += l; 752 sz -=l; 753 } 754 } 755 756 /* 757 * _substrcmp takes two strings and returns 1 if they do not match, 758 * and 0 if they match exactly or the first string is a sub-string 759 * of the second. A warning is printed to stderr in the case that the 760 * first string is a sub-string of the second. 761 * 762 * This function will be removed in the future through the usual 763 * deprecation process. 764 */ 765 int 766 _substrcmp(const char *str1, const char* str2) 767 { 768 769 if (strncmp(str1, str2, strlen(str1)) != 0) 770 return 1; 771 772 if (strlen(str1) != strlen(str2)) 773 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 774 str1, str2); 775 return 0; 776 } 777 778 /* 779 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 780 * and 0 if they match exactly or the second string is a sub-string 781 * of the first. A warning is printed to stderr in the case that the 782 * first string does not match the third. 783 * 784 * This function exists to warn about the bizarre construction 785 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 786 * for "bytes". The problem is that in addition to accepting "by", 787 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 788 * other string beginning with "by". 789 * 790 * This function will be removed in the future through the usual 791 * deprecation process. 792 */ 793 int 794 _substrcmp2(const char *str1, const char* str2, const char* str3) 795 { 796 797 if (strncmp(str1, str2, strlen(str2)) != 0) 798 return 1; 799 800 if (strcmp(str1, str3) != 0) 801 warnx("DEPRECATED: '%s' matched '%s'", 802 str1, str3); 803 return 0; 804 } 805 806 /* 807 * prints one port, symbolic or numeric 808 */ 809 static void 810 print_port(struct buf_pr *bp, int proto, uint16_t port) 811 { 812 813 if (proto == IPPROTO_ETHERTYPE) { 814 char const *s; 815 816 if (co.do_resolv && (s = match_value(ether_types, port)) ) 817 bprintf(bp, "%s", s); 818 else 819 bprintf(bp, "0x%04x", port); 820 } else { 821 struct servent *se = NULL; 822 if (co.do_resolv) { 823 struct protoent *pe = getprotobynumber(proto); 824 825 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 826 } 827 if (se) 828 bprintf(bp, "%s", se->s_name); 829 else 830 bprintf(bp, "%d", port); 831 } 832 } 833 834 static struct _s_x _port_name[] = { 835 {"dst-port", O_IP_DSTPORT}, 836 {"src-port", O_IP_SRCPORT}, 837 {"ipid", O_IPID}, 838 {"iplen", O_IPLEN}, 839 {"ipttl", O_IPTTL}, 840 {"mac-type", O_MAC_TYPE}, 841 {"tcpdatalen", O_TCPDATALEN}, 842 {"tcpwin", O_TCPWIN}, 843 {"tagged", O_TAGGED}, 844 {NULL, 0} 845 }; 846 847 /* 848 * Print the values in a list 16-bit items of the types above. 849 * XXX todo: add support for mask. 850 */ 851 static void 852 print_newports(struct buf_pr *bp, ipfw_insn_u16 *cmd, int proto, int opcode) 853 { 854 uint16_t *p = cmd->ports; 855 int i; 856 char const *sep; 857 858 if (opcode != 0) { 859 sep = match_value(_port_name, opcode); 860 if (sep == NULL) 861 sep = "???"; 862 bprintf(bp, " %s", sep); 863 } 864 sep = " "; 865 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 866 bprintf(bp, "%s", sep); 867 print_port(bp, proto, p[0]); 868 if (p[0] != p[1]) { 869 bprintf(bp, "-"); 870 print_port(bp, proto, p[1]); 871 } 872 sep = ","; 873 } 874 } 875 876 /* 877 * Like strtol, but also translates service names into port numbers 878 * for some protocols. 879 * In particular: 880 * proto == -1 disables the protocol check; 881 * proto == IPPROTO_ETHERTYPE looks up an internal table 882 * proto == <some value in /etc/protocols> matches the values there. 883 * Returns *end == s in case the parameter is not found. 884 */ 885 static int 886 strtoport(char *s, char **end, int base, int proto) 887 { 888 char *p, *buf; 889 char *s1; 890 int i; 891 892 *end = s; /* default - not found */ 893 if (*s == '\0') 894 return 0; /* not found */ 895 896 if (isdigit(*s)) 897 return strtol(s, end, base); 898 899 /* 900 * find separator. '\\' escapes the next char. 901 */ 902 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 903 if (*s1 == '\\' && s1[1] != '\0') 904 s1++; 905 906 buf = safe_calloc(s1 - s + 1, 1); 907 908 /* 909 * copy into a buffer skipping backslashes 910 */ 911 for (p = s, i = 0; p != s1 ; p++) 912 if (*p != '\\') 913 buf[i++] = *p; 914 buf[i++] = '\0'; 915 916 if (proto == IPPROTO_ETHERTYPE) { 917 i = match_token(ether_types, buf); 918 free(buf); 919 if (i != -1) { /* found */ 920 *end = s1; 921 return i; 922 } 923 } else { 924 struct protoent *pe = NULL; 925 struct servent *se; 926 927 if (proto != 0) 928 pe = getprotobynumber(proto); 929 setservent(1); 930 se = getservbyname(buf, pe ? pe->p_name : NULL); 931 free(buf); 932 if (se != NULL) { 933 *end = s1; 934 return ntohs(se->s_port); 935 } 936 } 937 return 0; /* not found */ 938 } 939 940 /* 941 * Fill the body of the command with the list of port ranges. 942 */ 943 static int 944 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 945 { 946 uint16_t a, b, *p = cmd->ports; 947 int i = 0; 948 char *s = av; 949 950 while (*s) { 951 a = strtoport(av, &s, 0, proto); 952 if (s == av) /* empty or invalid argument */ 953 return (0); 954 955 CHECK_LENGTH(cblen, i + 2); 956 957 switch (*s) { 958 case '-': /* a range */ 959 av = s + 1; 960 b = strtoport(av, &s, 0, proto); 961 /* Reject expressions like '1-abc' or '1-2-3'. */ 962 if (s == av || (*s != ',' && *s != '\0')) 963 return (0); 964 p[0] = a; 965 p[1] = b; 966 break; 967 case ',': /* comma separated list */ 968 case '\0': 969 p[0] = p[1] = a; 970 break; 971 default: 972 warnx("port list: invalid separator <%c> in <%s>", 973 *s, av); 974 return (0); 975 } 976 977 i++; 978 p += 2; 979 av = s + 1; 980 } 981 if (i > 0) { 982 if (i + 1 > F_LEN_MASK) 983 errx(EX_DATAERR, "too many ports/ranges\n"); 984 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 985 } 986 return (i); 987 } 988 989 /* 990 * Fill the body of the command with the list of DiffServ codepoints. 991 */ 992 static void 993 fill_dscp(ipfw_insn *cmd, char *av, int cblen) 994 { 995 uint32_t *low, *high; 996 char *s = av, *a; 997 int code; 998 999 cmd->opcode = O_DSCP; 1000 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1001 1002 CHECK_CMDLEN; 1003 1004 low = (uint32_t *)(cmd + 1); 1005 high = low + 1; 1006 1007 *low = 0; 1008 *high = 0; 1009 1010 while (s != NULL) { 1011 a = strchr(s, ','); 1012 1013 if (a != NULL) 1014 *a++ = '\0'; 1015 1016 if (isalpha(*s)) { 1017 if ((code = match_token(f_ipdscp, s)) == -1) 1018 errx(EX_DATAERR, "Unknown DSCP code"); 1019 } else { 1020 code = strtoul(s, NULL, 10); 1021 if (code < 0 || code > 63) 1022 errx(EX_DATAERR, "Invalid DSCP value"); 1023 } 1024 1025 if (code > 32) 1026 *high |= 1 << (code - 32); 1027 else 1028 *low |= 1 << code; 1029 1030 s = a; 1031 } 1032 } 1033 1034 static struct _s_x icmpcodes[] = { 1035 { "net", ICMP_UNREACH_NET }, 1036 { "host", ICMP_UNREACH_HOST }, 1037 { "protocol", ICMP_UNREACH_PROTOCOL }, 1038 { "port", ICMP_UNREACH_PORT }, 1039 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 1040 { "srcfail", ICMP_UNREACH_SRCFAIL }, 1041 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 1042 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 1043 { "isolated", ICMP_UNREACH_ISOLATED }, 1044 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 1045 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 1046 { "tosnet", ICMP_UNREACH_TOSNET }, 1047 { "toshost", ICMP_UNREACH_TOSHOST }, 1048 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 1049 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 1050 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 1051 { NULL, 0 } 1052 }; 1053 1054 static void 1055 fill_reject_code(u_short *codep, char *str) 1056 { 1057 int val; 1058 char *s; 1059 1060 val = strtoul(str, &s, 0); 1061 if (s == str || *s != '\0' || val >= 0x100) 1062 val = match_token(icmpcodes, str); 1063 if (val < 0) 1064 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 1065 *codep = val; 1066 return; 1067 } 1068 1069 static void 1070 print_reject_code(struct buf_pr *bp, uint16_t code) 1071 { 1072 char const *s; 1073 1074 if ((s = match_value(icmpcodes, code)) != NULL) 1075 bprintf(bp, "unreach %s", s); 1076 else 1077 bprintf(bp, "unreach %u", code); 1078 } 1079 1080 /* 1081 * Returns the number of bits set (from left) in a contiguous bitmask, 1082 * or -1 if the mask is not contiguous. 1083 * XXX this needs a proper fix. 1084 * This effectively works on masks in big-endian (network) format. 1085 * when compiled on little endian architectures. 1086 * 1087 * First bit is bit 7 of the first byte -- note, for MAC addresses, 1088 * the first bit on the wire is bit 0 of the first byte. 1089 * len is the max length in bits. 1090 */ 1091 int 1092 contigmask(uint8_t *p, int len) 1093 { 1094 int i, n; 1095 1096 for (i=0; i<len ; i++) 1097 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 1098 break; 1099 for (n=i+1; n < len; n++) 1100 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 1101 return -1; /* mask not contiguous */ 1102 return i; 1103 } 1104 1105 /* 1106 * print flags set/clear in the two bitmasks passed as parameters. 1107 * There is a specialized check for f_tcpflags. 1108 */ 1109 static void 1110 print_flags(struct buf_pr *bp, char const *name, ipfw_insn *cmd, 1111 struct _s_x *list) 1112 { 1113 char const *comma = ""; 1114 int i; 1115 uint8_t set = cmd->arg1 & 0xff; 1116 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 1117 1118 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 1119 bprintf(bp, " setup"); 1120 return; 1121 } 1122 1123 bprintf(bp, " %s ", name); 1124 for (i=0; list[i].x != 0; i++) { 1125 if (set & list[i].x) { 1126 set &= ~list[i].x; 1127 bprintf(bp, "%s%s", comma, list[i].s); 1128 comma = ","; 1129 } 1130 if (clear & list[i].x) { 1131 clear &= ~list[i].x; 1132 bprintf(bp, "%s!%s", comma, list[i].s); 1133 comma = ","; 1134 } 1135 } 1136 } 1137 1138 1139 /* 1140 * Print the ip address contained in a command. 1141 */ 1142 static void 1143 print_ip(struct buf_pr *bp, struct format_opts *fo, ipfw_insn_ip *cmd, 1144 char const *s) 1145 { 1146 struct hostent *he = NULL; 1147 struct in_addr *ia; 1148 uint32_t len = F_LEN((ipfw_insn *)cmd); 1149 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 1150 char *t; 1151 1152 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 1153 uint32_t d = a[1]; 1154 const char *arg = "<invalid>"; 1155 1156 if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) 1157 arg = match_value(rule_options, lookup_key[d]); 1158 t = table_search_ctlv(fo->tstate, ((ipfw_insn *)cmd)->arg1); 1159 bprintf(bp, "%s lookup %s %s", cmd->o.len & F_NOT ? " not": "", 1160 arg, t); 1161 return; 1162 } 1163 bprintf(bp, "%s%s ", cmd->o.len & F_NOT ? " not": "", s); 1164 1165 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 1166 bprintf(bp, "me"); 1167 return; 1168 } 1169 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 1170 cmd->o.opcode == O_IP_DST_LOOKUP) { 1171 t = table_search_ctlv(fo->tstate, ((ipfw_insn *)cmd)->arg1); 1172 bprintf(bp, "table(%s", t); 1173 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1174 bprintf(bp, ",%u", *a); 1175 bprintf(bp, ")"); 1176 return; 1177 } 1178 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 1179 uint32_t x, *map = (uint32_t *)&(cmd->mask); 1180 int i, j; 1181 char comma = '{'; 1182 1183 x = cmd->o.arg1 - 1; 1184 x = htonl( ~x ); 1185 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 1186 bprintf(bp, "%s/%d", inet_ntoa(cmd->addr), 1187 contigmask((uint8_t *)&x, 32)); 1188 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 1189 x &= 0xff; /* base */ 1190 /* 1191 * Print bits and ranges. 1192 * Locate first bit set (i), then locate first bit unset (j). 1193 * If we have 3+ consecutive bits set, then print them as a 1194 * range, otherwise only print the initial bit and rescan. 1195 */ 1196 for (i=0; i < cmd->o.arg1; i++) 1197 if (map[i/32] & (1<<(i & 31))) { 1198 for (j=i+1; j < cmd->o.arg1; j++) 1199 if (!(map[ j/32] & (1<<(j & 31)))) 1200 break; 1201 bprintf(bp, "%c%d", comma, i+x); 1202 if (j>i+2) { /* range has at least 3 elements */ 1203 bprintf(bp, "-%d", j-1+x); 1204 i = j-1; 1205 } 1206 comma = ','; 1207 } 1208 bprintf(bp, "}"); 1209 return; 1210 } 1211 /* 1212 * len == 2 indicates a single IP, whereas lists of 1 or more 1213 * addr/mask pairs have len = (2n+1). We convert len to n so we 1214 * use that to count the number of entries. 1215 */ 1216 for (len = len / 2; len > 0; len--, a += 2) { 1217 int mb = /* mask length */ 1218 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 1219 32 : contigmask((uint8_t *)&(a[1]), 32); 1220 if (mb == 32 && co.do_resolv) 1221 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 1222 if (he != NULL) /* resolved to name */ 1223 bprintf(bp, "%s", he->h_name); 1224 else if (mb == 0) /* any */ 1225 bprintf(bp, "any"); 1226 else { /* numeric IP followed by some kind of mask */ 1227 ia = (struct in_addr *)&a[0]; 1228 bprintf(bp, "%s", inet_ntoa(*ia)); 1229 if (mb < 0) { 1230 ia = (struct in_addr *)&a[1]; 1231 bprintf(bp, ":%s", inet_ntoa(*ia)); 1232 } else if (mb < 32) 1233 bprintf(bp, "/%d", mb); 1234 } 1235 if (len > 1) 1236 bprintf(bp, ","); 1237 } 1238 } 1239 1240 /* 1241 * prints a MAC address/mask pair 1242 */ 1243 static void 1244 print_mac(struct buf_pr *bp, uint8_t *addr, uint8_t *mask) 1245 { 1246 int l = contigmask(mask, 48); 1247 1248 if (l == 0) 1249 bprintf(bp, " any"); 1250 else { 1251 bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", 1252 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1253 if (l == -1) 1254 bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", 1255 mask[0], mask[1], mask[2], 1256 mask[3], mask[4], mask[5]); 1257 else if (l < 48) 1258 bprintf(bp, "/%d", l); 1259 } 1260 } 1261 1262 static void 1263 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1264 { 1265 uint8_t type; 1266 1267 cmd->d[0] = 0; 1268 while (*av) { 1269 if (*av == ',') 1270 av++; 1271 1272 type = strtoul(av, &av, 0); 1273 1274 if (*av != ',' && *av != '\0') 1275 errx(EX_DATAERR, "invalid ICMP type"); 1276 1277 if (type > 31) 1278 errx(EX_DATAERR, "ICMP type out of range"); 1279 1280 cmd->d[0] |= 1 << type; 1281 } 1282 cmd->o.opcode = O_ICMPTYPE; 1283 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1284 } 1285 1286 static void 1287 print_icmptypes(struct buf_pr *bp, ipfw_insn_u32 *cmd) 1288 { 1289 int i; 1290 char sep= ' '; 1291 1292 bprintf(bp, " icmptypes"); 1293 for (i = 0; i < 32; i++) { 1294 if ( (cmd->d[0] & (1 << (i))) == 0) 1295 continue; 1296 bprintf(bp, "%c%d", sep, i); 1297 sep = ','; 1298 } 1299 } 1300 1301 static void 1302 print_dscp(struct buf_pr *bp, ipfw_insn_u32 *cmd) 1303 { 1304 int i, c; 1305 uint32_t *v; 1306 char sep= ' '; 1307 const char *code; 1308 1309 bprintf(bp, " dscp"); 1310 i = 0; 1311 c = 0; 1312 v = cmd->d; 1313 while (i < 64) { 1314 if (*v & (1 << i)) { 1315 if ((code = match_value(f_ipdscp, i)) != NULL) 1316 bprintf(bp, "%c%s", sep, code); 1317 else 1318 bprintf(bp, "%c%d", sep, i); 1319 sep = ','; 1320 } 1321 1322 if ((++i % 32) == 0) 1323 v++; 1324 } 1325 } 1326 1327 /* 1328 * show_ipfw() prints the body of an ipfw rule. 1329 * Because the standard rule has at least proto src_ip dst_ip, we use 1330 * a helper function to produce these entries if not provided explicitly. 1331 * The first argument is the list of fields we have, the second is 1332 * the list of fields we want to be printed. 1333 * 1334 * Special cases if we have provided a MAC header: 1335 * + if the rule does not contain IP addresses/ports, do not print them; 1336 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 1337 * 1338 * Once we have 'have_options', IP header fields are printed as options. 1339 */ 1340 #define HAVE_PROTO 0x0001 1341 #define HAVE_SRCIP 0x0002 1342 #define HAVE_DSTIP 0x0004 1343 #define HAVE_PROTO4 0x0008 1344 #define HAVE_PROTO6 0x0010 1345 #define HAVE_IP 0x0100 1346 #define HAVE_OPTIONS 0x8000 1347 1348 static void 1349 show_prerequisites(struct buf_pr *bp, int *flags, int want, int cmd) 1350 { 1351 (void)cmd; /* UNUSED */ 1352 if (co.comment_only) 1353 return; 1354 if ( (*flags & HAVE_IP) == HAVE_IP) 1355 *flags |= HAVE_OPTIONS; 1356 1357 if ( !(*flags & HAVE_OPTIONS)) { 1358 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { 1359 if ( (*flags & HAVE_PROTO4)) 1360 bprintf(bp, " ip4"); 1361 else if ( (*flags & HAVE_PROTO6)) 1362 bprintf(bp, " ip6"); 1363 else 1364 bprintf(bp, " ip"); 1365 } 1366 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 1367 bprintf(bp, " from any"); 1368 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 1369 bprintf(bp, " to any"); 1370 } 1371 *flags |= want; 1372 } 1373 1374 static void 1375 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 1376 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 1377 { 1378 static int twidth = 0; 1379 int l; 1380 ipfw_insn *cmd, *tagptr = NULL; 1381 const char *comment = NULL; /* ptr to comment if we have one */ 1382 int proto = 0; /* default */ 1383 int flags = 0; /* prerequisites */ 1384 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 1385 ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ 1386 int or_block = 0; /* we are in an or block */ 1387 uint32_t uval; 1388 1389 if ((fo->set_mask & (1 << rule->set)) == 0) { 1390 /* disabled mask */ 1391 if (!co->show_sets) 1392 return; 1393 else 1394 bprintf(bp, "# DISABLED "); 1395 } 1396 bprintf(bp, "%05u ", rule->rulenum); 1397 1398 /* Print counters if enabled */ 1399 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 1400 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 1401 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 1402 } 1403 1404 if (co->do_time == 2) 1405 bprintf(bp, "%10u ", cntr->timestamp); 1406 else if (co->do_time == 1) { 1407 char timestr[30]; 1408 time_t t = (time_t)0; 1409 1410 if (twidth == 0) { 1411 strcpy(timestr, ctime(&t)); 1412 *strchr(timestr, '\n') = '\0'; 1413 twidth = strlen(timestr); 1414 } 1415 if (cntr->timestamp > 0) { 1416 t = _long_to_time(cntr->timestamp); 1417 1418 strcpy(timestr, ctime(&t)); 1419 *strchr(timestr, '\n') = '\0'; 1420 bprintf(bp, "%s ", timestr); 1421 } else { 1422 bprintf(bp, "%*s", twidth, " "); 1423 } 1424 } 1425 1426 if (co->show_sets) 1427 bprintf(bp, "set %d ", rule->set); 1428 1429 /* 1430 * print the optional "match probability" 1431 */ 1432 if (rule->cmd_len > 0) { 1433 cmd = rule->cmd ; 1434 if (cmd->opcode == O_PROB) { 1435 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 1436 double d = 1.0 * p->d[0]; 1437 1438 d = (d / 0x7fffffff); 1439 bprintf(bp, "prob %f ", d); 1440 } 1441 } 1442 1443 /* 1444 * first print actions 1445 */ 1446 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 1447 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1448 switch(cmd->opcode) { 1449 case O_CHECK_STATE: 1450 bprintf(bp, "check-state"); 1451 /* avoid printing anything else */ 1452 flags = HAVE_PROTO | HAVE_SRCIP | 1453 HAVE_DSTIP | HAVE_IP; 1454 break; 1455 1456 case O_ACCEPT: 1457 bprintf(bp, "allow"); 1458 break; 1459 1460 case O_COUNT: 1461 bprintf(bp, "count"); 1462 break; 1463 1464 case O_DENY: 1465 bprintf(bp, "deny"); 1466 break; 1467 1468 case O_REJECT: 1469 if (cmd->arg1 == ICMP_REJECT_RST) 1470 bprintf(bp, "reset"); 1471 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1472 bprintf(bp, "reject"); 1473 else 1474 print_reject_code(bp, cmd->arg1); 1475 break; 1476 1477 case O_UNREACH6: 1478 if (cmd->arg1 == ICMP6_UNREACH_RST) 1479 bprintf(bp, "reset6"); 1480 else 1481 print_unreach6_code(cmd->arg1); 1482 break; 1483 1484 case O_SKIPTO: 1485 bprint_uint_arg(bp, "skipto ", cmd->arg1); 1486 break; 1487 1488 case O_PIPE: 1489 bprint_uint_arg(bp, "pipe ", cmd->arg1); 1490 break; 1491 1492 case O_QUEUE: 1493 bprint_uint_arg(bp, "queue ", cmd->arg1); 1494 break; 1495 1496 case O_DIVERT: 1497 bprint_uint_arg(bp, "divert ", cmd->arg1); 1498 break; 1499 1500 case O_TEE: 1501 bprint_uint_arg(bp, "tee ", cmd->arg1); 1502 break; 1503 1504 case O_NETGRAPH: 1505 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 1506 break; 1507 1508 case O_NGTEE: 1509 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 1510 break; 1511 1512 case O_FORWARD_IP: 1513 { 1514 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1515 1516 if (s->sa.sin_addr.s_addr == INADDR_ANY) { 1517 bprintf(bp, "fwd tablearg"); 1518 } else { 1519 bprintf(bp, "fwd %s",inet_ntoa(s->sa.sin_addr)); 1520 } 1521 if (s->sa.sin_port) 1522 bprintf(bp, ",%d", s->sa.sin_port); 1523 } 1524 break; 1525 1526 case O_FORWARD_IP6: 1527 { 1528 char buf[4 + INET6_ADDRSTRLEN + 1]; 1529 ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd; 1530 1531 bprintf(bp, "fwd %s", inet_ntop(AF_INET6, 1532 &s->sa.sin6_addr, buf, sizeof(buf))); 1533 if (s->sa.sin6_port) 1534 bprintf(bp, ",%d", s->sa.sin6_port); 1535 } 1536 break; 1537 1538 case O_LOG: /* O_LOG is printed last */ 1539 logptr = (ipfw_insn_log *)cmd; 1540 break; 1541 1542 case O_ALTQ: /* O_ALTQ is printed after O_LOG */ 1543 altqptr = (ipfw_insn_altq *)cmd; 1544 break; 1545 1546 case O_TAG: 1547 tagptr = cmd; 1548 break; 1549 1550 case O_NAT: 1551 if (cmd->arg1 != 0) 1552 bprint_uint_arg(bp, "nat ", cmd->arg1); 1553 else 1554 bprintf(bp, "nat global"); 1555 break; 1556 1557 case O_SETFIB: 1558 bprint_uint_arg(bp, "setfib ", cmd->arg1 & 0x7FFF); 1559 break; 1560 1561 case O_SETDSCP: 1562 { 1563 const char *code; 1564 1565 if (cmd->arg1 == IP_FW_TARG) { 1566 bprint_uint_arg(bp, "setdscp ", cmd->arg1); 1567 break; 1568 } 1569 uval = cmd->arg1 & 0x3F; 1570 if ((code = match_value(f_ipdscp, uval)) != NULL) 1571 bprintf(bp, "setdscp %s", code); 1572 else 1573 bprint_uint_arg(bp, "setdscp ", uval); 1574 } 1575 break; 1576 1577 case O_REASS: 1578 bprintf(bp, "reass"); 1579 break; 1580 1581 case O_CALLRETURN: 1582 if (cmd->len & F_NOT) 1583 bprintf(bp, "return"); 1584 else 1585 bprint_uint_arg(bp, "call ", cmd->arg1); 1586 break; 1587 1588 default: 1589 bprintf(bp, "** unrecognized action %d len %d ", 1590 cmd->opcode, cmd->len); 1591 } 1592 } 1593 if (logptr) { 1594 if (logptr->max_log > 0) 1595 bprintf(bp, " log logamount %d", logptr->max_log); 1596 else 1597 bprintf(bp, " log"); 1598 } 1599 #ifndef NO_ALTQ 1600 if (altqptr) { 1601 print_altq_cmd(bp, altqptr); 1602 } 1603 #endif 1604 if (tagptr) { 1605 if (tagptr->len & F_NOT) 1606 bprint_uint_arg(bp, " untag ", tagptr->arg1); 1607 else 1608 bprint_uint_arg(bp, " tag ", tagptr->arg1); 1609 } 1610 1611 /* 1612 * then print the body. 1613 */ 1614 for (l = rule->act_ofs, cmd = rule->cmd; 1615 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1616 if ((cmd->len & F_OR) || (cmd->len & F_NOT)) 1617 continue; 1618 if (cmd->opcode == O_IP4) { 1619 flags |= HAVE_PROTO4; 1620 break; 1621 } else if (cmd->opcode == O_IP6) { 1622 flags |= HAVE_PROTO6; 1623 break; 1624 } 1625 } 1626 if (rule->flags & IPFW_RULE_NOOPT) { /* empty rules before options */ 1627 if (!co->do_compact) { 1628 show_prerequisites(bp, &flags, HAVE_PROTO, 0); 1629 bprintf(bp, " from any to any"); 1630 } 1631 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | 1632 HAVE_SRCIP | HAVE_DSTIP; 1633 } 1634 1635 if (co->comment_only) 1636 comment = "..."; 1637 1638 for (l = rule->act_ofs, cmd = rule->cmd; 1639 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1640 /* useful alias */ 1641 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1642 1643 if (co->comment_only) { 1644 if (cmd->opcode != O_NOP) 1645 continue; 1646 bprintf(bp, " // %s\n", (char *)(cmd + 1)); 1647 return; 1648 } 1649 1650 show_prerequisites(bp, &flags, 0, cmd->opcode); 1651 1652 switch(cmd->opcode) { 1653 case O_PROB: 1654 break; /* done already */ 1655 1656 case O_PROBE_STATE: 1657 break; /* no need to print anything here */ 1658 1659 case O_IP_SRC: 1660 case O_IP_SRC_LOOKUP: 1661 case O_IP_SRC_MASK: 1662 case O_IP_SRC_ME: 1663 case O_IP_SRC_SET: 1664 show_prerequisites(bp, &flags, HAVE_PROTO, 0); 1665 if (!(flags & HAVE_SRCIP)) 1666 bprintf(bp, " from"); 1667 if ((cmd->len & F_OR) && !or_block) 1668 bprintf(bp, " {"); 1669 print_ip(bp, fo, (ipfw_insn_ip *)cmd, 1670 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1671 flags |= HAVE_SRCIP; 1672 break; 1673 1674 case O_IP_DST: 1675 case O_IP_DST_LOOKUP: 1676 case O_IP_DST_MASK: 1677 case O_IP_DST_ME: 1678 case O_IP_DST_SET: 1679 show_prerequisites(bp, &flags, HAVE_PROTO|HAVE_SRCIP, 0); 1680 if (!(flags & HAVE_DSTIP)) 1681 bprintf(bp, " to"); 1682 if ((cmd->len & F_OR) && !or_block) 1683 bprintf(bp, " {"); 1684 print_ip(bp, fo, (ipfw_insn_ip *)cmd, 1685 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1686 flags |= HAVE_DSTIP; 1687 break; 1688 1689 case O_IP6_SRC: 1690 case O_IP6_SRC_MASK: 1691 case O_IP6_SRC_ME: 1692 show_prerequisites(bp, &flags, HAVE_PROTO, 0); 1693 if (!(flags & HAVE_SRCIP)) 1694 bprintf(bp, " from"); 1695 if ((cmd->len & F_OR) && !or_block) 1696 bprintf(bp, " {"); 1697 print_ip6(bp, (ipfw_insn_ip6 *)cmd, 1698 (flags & HAVE_OPTIONS) ? " src-ip6" : ""); 1699 flags |= HAVE_SRCIP | HAVE_PROTO; 1700 break; 1701 1702 case O_IP6_DST: 1703 case O_IP6_DST_MASK: 1704 case O_IP6_DST_ME: 1705 show_prerequisites(bp, &flags, HAVE_PROTO|HAVE_SRCIP, 0); 1706 if (!(flags & HAVE_DSTIP)) 1707 bprintf(bp, " to"); 1708 if ((cmd->len & F_OR) && !or_block) 1709 bprintf(bp, " {"); 1710 print_ip6(bp, (ipfw_insn_ip6 *)cmd, 1711 (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); 1712 flags |= HAVE_DSTIP; 1713 break; 1714 1715 case O_FLOW6ID: 1716 print_flow6id(bp, (ipfw_insn_u32 *) cmd ); 1717 flags |= HAVE_OPTIONS; 1718 break; 1719 1720 case O_IP_DSTPORT: 1721 show_prerequisites(bp, &flags, 1722 HAVE_PROTO | HAVE_SRCIP | 1723 HAVE_DSTIP | HAVE_IP, 0); 1724 case O_IP_SRCPORT: 1725 if (flags & HAVE_DSTIP) 1726 flags |= HAVE_IP; 1727 show_prerequisites(bp, &flags, 1728 HAVE_PROTO | HAVE_SRCIP, 0); 1729 if ((cmd->len & F_OR) && !or_block) 1730 bprintf(bp, " {"); 1731 if (cmd->len & F_NOT) 1732 bprintf(bp, " not"); 1733 print_newports(bp, (ipfw_insn_u16 *)cmd, proto, 1734 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1735 break; 1736 1737 case O_PROTO: { 1738 struct protoent *pe = NULL; 1739 1740 if ((cmd->len & F_OR) && !or_block) 1741 bprintf(bp, " {"); 1742 if (cmd->len & F_NOT) 1743 bprintf(bp, " not"); 1744 proto = cmd->arg1; 1745 pe = getprotobynumber(cmd->arg1); 1746 if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && 1747 !(flags & HAVE_PROTO)) 1748 show_prerequisites(bp, &flags, 1749 HAVE_PROTO | HAVE_IP | HAVE_SRCIP | 1750 HAVE_DSTIP | HAVE_OPTIONS, 0); 1751 if (flags & HAVE_OPTIONS) 1752 bprintf(bp, " proto"); 1753 if (pe) 1754 bprintf(bp, " %s", pe->p_name); 1755 else 1756 bprintf(bp, " %u", cmd->arg1); 1757 } 1758 flags |= HAVE_PROTO; 1759 break; 1760 1761 default: /*options ... */ 1762 if (!(cmd->len & (F_OR|F_NOT))) 1763 if (((cmd->opcode == O_IP6) && 1764 (flags & HAVE_PROTO6)) || 1765 ((cmd->opcode == O_IP4) && 1766 (flags & HAVE_PROTO4))) 1767 break; 1768 show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_SRCIP | 1769 HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); 1770 if ((cmd->len & F_OR) && !or_block) 1771 bprintf(bp, " {"); 1772 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1773 bprintf(bp, " not"); 1774 switch(cmd->opcode) { 1775 case O_MACADDR2: { 1776 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1777 1778 bprintf(bp, " MAC"); 1779 print_mac(bp, m->addr, m->mask); 1780 print_mac(bp, m->addr + 6, m->mask + 6); 1781 } 1782 break; 1783 1784 case O_MAC_TYPE: 1785 print_newports(bp, (ipfw_insn_u16 *)cmd, 1786 IPPROTO_ETHERTYPE, cmd->opcode); 1787 break; 1788 1789 1790 case O_FRAG: 1791 bprintf(bp, " frag"); 1792 break; 1793 1794 case O_FIB: 1795 bprintf(bp, " fib %u", cmd->arg1 ); 1796 break; 1797 case O_SOCKARG: 1798 bprintf(bp, " sockarg"); 1799 break; 1800 1801 case O_IN: 1802 bprintf(bp, cmd->len & F_NOT ? " out" : " in"); 1803 break; 1804 1805 case O_DIVERTED: 1806 switch (cmd->arg1) { 1807 case 3: 1808 bprintf(bp, " diverted"); 1809 break; 1810 case 1: 1811 bprintf(bp, " diverted-loopback"); 1812 break; 1813 case 2: 1814 bprintf(bp, " diverted-output"); 1815 break; 1816 default: 1817 bprintf(bp, " diverted-?<%u>", cmd->arg1); 1818 break; 1819 } 1820 break; 1821 1822 case O_LAYER2: 1823 bprintf(bp, " layer2"); 1824 break; 1825 case O_XMIT: 1826 case O_RECV: 1827 case O_VIA: 1828 { 1829 char const *s, *t; 1830 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1831 1832 if (cmd->opcode == O_XMIT) 1833 s = "xmit"; 1834 else if (cmd->opcode == O_RECV) 1835 s = "recv"; 1836 else /* if (cmd->opcode == O_VIA) */ 1837 s = "via"; 1838 if (cmdif->name[0] == '\0') 1839 bprintf(bp, " %s %s", s, 1840 inet_ntoa(cmdif->p.ip)); 1841 else if (cmdif->name[0] == '\1') { 1842 /* interface table */ 1843 t = table_search_ctlv(fo->tstate, 1844 cmdif->p.kidx); 1845 bprintf(bp, " %s table(%s)", s, t); 1846 } else 1847 bprintf(bp, " %s %s", s, cmdif->name); 1848 1849 break; 1850 } 1851 case O_IP_FLOW_LOOKUP: 1852 { 1853 char *t; 1854 1855 t = table_search_ctlv(fo->tstate, cmd->arg1); 1856 bprintf(bp, " flow table(%s", t); 1857 if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) 1858 bprintf(bp, ",%u", 1859 ((ipfw_insn_u32 *)cmd)->d[0]); 1860 bprintf(bp, ")"); 1861 break; 1862 } 1863 case O_IPID: 1864 if (F_LEN(cmd) == 1) 1865 bprintf(bp, " ipid %u", cmd->arg1 ); 1866 else 1867 print_newports(bp, (ipfw_insn_u16 *)cmd, 0, 1868 O_IPID); 1869 break; 1870 1871 case O_IPTTL: 1872 if (F_LEN(cmd) == 1) 1873 bprintf(bp, " ipttl %u", cmd->arg1 ); 1874 else 1875 print_newports(bp, (ipfw_insn_u16 *)cmd, 0, 1876 O_IPTTL); 1877 break; 1878 1879 case O_IPVER: 1880 bprintf(bp, " ipver %u", cmd->arg1 ); 1881 break; 1882 1883 case O_IPPRECEDENCE: 1884 bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); 1885 break; 1886 1887 case O_DSCP: 1888 print_dscp(bp, (ipfw_insn_u32 *)cmd); 1889 break; 1890 1891 case O_IPLEN: 1892 if (F_LEN(cmd) == 1) 1893 bprintf(bp, " iplen %u", cmd->arg1 ); 1894 else 1895 print_newports(bp, (ipfw_insn_u16 *)cmd, 0, 1896 O_IPLEN); 1897 break; 1898 1899 case O_IPOPT: 1900 print_flags(bp, "ipoptions", cmd, f_ipopts); 1901 break; 1902 1903 case O_IPTOS: 1904 print_flags(bp, "iptos", cmd, f_iptos); 1905 break; 1906 1907 case O_ICMPTYPE: 1908 print_icmptypes(bp, (ipfw_insn_u32 *)cmd); 1909 break; 1910 1911 case O_ESTAB: 1912 bprintf(bp, " established"); 1913 break; 1914 1915 case O_TCPDATALEN: 1916 if (F_LEN(cmd) == 1) 1917 bprintf(bp, " tcpdatalen %u", cmd->arg1 ); 1918 else 1919 print_newports(bp, (ipfw_insn_u16 *)cmd, 0, 1920 O_TCPDATALEN); 1921 break; 1922 1923 case O_TCPFLAGS: 1924 print_flags(bp, "tcpflags", cmd, f_tcpflags); 1925 break; 1926 1927 case O_TCPOPTS: 1928 print_flags(bp, "tcpoptions", cmd, f_tcpopts); 1929 break; 1930 1931 case O_TCPWIN: 1932 if (F_LEN(cmd) == 1) 1933 bprintf(bp, " tcpwin %u", cmd->arg1); 1934 else 1935 print_newports(bp, (ipfw_insn_u16 *)cmd, 0, 1936 O_TCPWIN); 1937 break; 1938 1939 case O_TCPACK: 1940 bprintf(bp, " tcpack %d", ntohl(cmd32->d[0])); 1941 break; 1942 1943 case O_TCPSEQ: 1944 bprintf(bp, " tcpseq %d", ntohl(cmd32->d[0])); 1945 break; 1946 1947 case O_UID: 1948 { 1949 struct passwd *pwd = getpwuid(cmd32->d[0]); 1950 1951 if (pwd) 1952 bprintf(bp, " uid %s", pwd->pw_name); 1953 else 1954 bprintf(bp, " uid %u", cmd32->d[0]); 1955 } 1956 break; 1957 1958 case O_GID: 1959 { 1960 struct group *grp = getgrgid(cmd32->d[0]); 1961 1962 if (grp) 1963 bprintf(bp, " gid %s", grp->gr_name); 1964 else 1965 bprintf(bp, " gid %u", cmd32->d[0]); 1966 } 1967 break; 1968 1969 case O_JAIL: 1970 bprintf(bp, " jail %d", cmd32->d[0]); 1971 break; 1972 1973 case O_VERREVPATH: 1974 bprintf(bp, " verrevpath"); 1975 break; 1976 1977 case O_VERSRCREACH: 1978 bprintf(bp, " versrcreach"); 1979 break; 1980 1981 case O_ANTISPOOF: 1982 bprintf(bp, " antispoof"); 1983 break; 1984 1985 case O_IPSEC: 1986 bprintf(bp, " ipsec"); 1987 break; 1988 1989 case O_NOP: 1990 comment = (char *)(cmd + 1); 1991 break; 1992 1993 case O_KEEP_STATE: 1994 bprintf(bp, " keep-state"); 1995 break; 1996 1997 case O_LIMIT: { 1998 struct _s_x *p = limit_masks; 1999 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 2000 uint8_t x = c->limit_mask; 2001 char const *comma = " "; 2002 2003 bprintf(bp, " limit"); 2004 for (; p->x != 0 ; p++) 2005 if ((x & p->x) == p->x) { 2006 x &= ~p->x; 2007 bprintf(bp, "%s%s", comma,p->s); 2008 comma = ","; 2009 } 2010 bprint_uint_arg(bp, " ", c->conn_limit); 2011 break; 2012 } 2013 2014 case O_IP6: 2015 bprintf(bp, " ip6"); 2016 break; 2017 2018 case O_IP4: 2019 bprintf(bp, " ip4"); 2020 break; 2021 2022 case O_ICMP6TYPE: 2023 print_icmp6types(bp, (ipfw_insn_u32 *)cmd); 2024 break; 2025 2026 case O_EXT_HDR: 2027 print_ext6hdr(bp, (ipfw_insn *)cmd); 2028 break; 2029 2030 case O_TAGGED: 2031 if (F_LEN(cmd) == 1) 2032 bprint_uint_arg(bp, " tagged ", 2033 cmd->arg1); 2034 else 2035 print_newports(bp, (ipfw_insn_u16 *)cmd, 2036 0, O_TAGGED); 2037 break; 2038 2039 default: 2040 bprintf(bp, " [opcode %d len %d]", 2041 cmd->opcode, cmd->len); 2042 } 2043 } 2044 if (cmd->len & F_OR) { 2045 bprintf(bp, " or"); 2046 or_block = 1; 2047 } else if (or_block) { 2048 bprintf(bp, " }"); 2049 or_block = 0; 2050 } 2051 } 2052 show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP 2053 | HAVE_IP, 0); 2054 if (comment) 2055 bprintf(bp, " // %s", comment); 2056 bprintf(bp, "\n"); 2057 } 2058 2059 static void 2060 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2061 struct buf_pr *bp, ipfw_dyn_rule *d) 2062 { 2063 struct protoent *pe; 2064 struct in_addr a; 2065 uint16_t rulenum; 2066 char buf[INET6_ADDRSTRLEN]; 2067 2068 if (!co->do_expired) { 2069 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 2070 return; 2071 } 2072 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2073 bprintf(bp, "%05d", rulenum); 2074 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2075 bprintf(bp, " "); 2076 pr_u64(bp, &d->pcnt, fo->pcwidth); 2077 pr_u64(bp, &d->bcnt, fo->bcwidth); 2078 bprintf(bp, "(%ds)", d->expire); 2079 } 2080 switch (d->dyn_type) { 2081 case O_LIMIT_PARENT: 2082 bprintf(bp, " PARENT %d", d->count); 2083 break; 2084 case O_LIMIT: 2085 bprintf(bp, " LIMIT"); 2086 break; 2087 case O_KEEP_STATE: /* bidir, no mask */ 2088 bprintf(bp, " STATE"); 2089 break; 2090 } 2091 2092 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2093 bprintf(bp, " %s", pe->p_name); 2094 else 2095 bprintf(bp, " proto %u", d->id.proto); 2096 2097 if (d->id.addr_type == 4) { 2098 a.s_addr = htonl(d->id.src_ip); 2099 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2100 2101 a.s_addr = htonl(d->id.dst_ip); 2102 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2103 } else if (d->id.addr_type == 6) { 2104 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2105 sizeof(buf)), d->id.src_port); 2106 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2107 buf, sizeof(buf)), d->id.dst_port); 2108 } else 2109 bprintf(bp, " UNKNOWN <-> UNKNOWN\n"); 2110 } 2111 2112 static int 2113 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2114 { 2115 ipfw_range_header rh; 2116 size_t sz; 2117 2118 memset(&rh, 0, sizeof(rh)); 2119 memcpy(&rh.range, rt, sizeof(*rt)); 2120 rh.range.head.length = sizeof(*rt); 2121 rh.range.head.type = IPFW_TLV_RANGE; 2122 sz = sizeof(rh); 2123 2124 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2125 return (-1); 2126 /* Save number of matched objects */ 2127 rt->new_set = rh.range.new_set; 2128 return (0); 2129 } 2130 2131 /* 2132 * This one handles all set-related commands 2133 * ipfw set { show | enable | disable } 2134 * ipfw set swap X Y 2135 * ipfw set move X to Y 2136 * ipfw set move rule X to Y 2137 */ 2138 void 2139 ipfw_sets_handler(char *av[]) 2140 { 2141 uint32_t masks[2]; 2142 int i; 2143 uint8_t cmd, rulenum; 2144 ipfw_range_tlv rt; 2145 char *msg; 2146 size_t size; 2147 2148 av++; 2149 memset(&rt, 0, sizeof(rt)); 2150 2151 if (av[0] == NULL) 2152 errx(EX_USAGE, "set needs command"); 2153 if (_substrcmp(*av, "show") == 0) { 2154 struct format_opts fo; 2155 ipfw_cfg_lheader *cfg; 2156 2157 memset(&fo, 0, sizeof(fo)); 2158 if (ipfw_get_config(&co, &fo, &cfg, &size) != 0) 2159 err(EX_OSERR, "requesting config failed"); 2160 2161 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2162 if ((cfg->set_mask & (1<<i)) == 0) { 2163 printf("%s %d", msg, i); 2164 msg = ""; 2165 } 2166 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2167 for (i = 0; i < RESVD_SET; i++) 2168 if ((cfg->set_mask & (1<<i)) != 0) { 2169 printf("%s %d", msg, i); 2170 msg = ""; 2171 } 2172 printf("\n"); 2173 free(cfg); 2174 } else if (_substrcmp(*av, "swap") == 0) { 2175 av++; 2176 if ( av[0] == NULL || av[1] == NULL ) 2177 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2178 rt.set = atoi(av[0]); 2179 rt.new_set = atoi(av[1]); 2180 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2181 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2182 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2183 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2184 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2185 } else if (_substrcmp(*av, "move") == 0) { 2186 av++; 2187 if (av[0] && _substrcmp(*av, "rule") == 0) { 2188 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2189 cmd = IP_FW_XMOVE; 2190 av++; 2191 } else 2192 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2193 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2194 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2195 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2196 rulenum = atoi(av[0]); 2197 rt.new_set = atoi(av[2]); 2198 if (cmd == IP_FW_XMOVE) { 2199 rt.start_rule = rulenum; 2200 rt.end_rule = rulenum; 2201 } else 2202 rt.set = rulenum; 2203 rt.new_set = atoi(av[2]); 2204 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2205 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2206 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2207 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2208 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2209 i = do_range_cmd(cmd, &rt); 2210 } else if (_substrcmp(*av, "disable") == 0 || 2211 _substrcmp(*av, "enable") == 0 ) { 2212 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2213 2214 av++; 2215 masks[0] = masks[1] = 0; 2216 2217 while (av[0]) { 2218 if (isdigit(**av)) { 2219 i = atoi(*av); 2220 if (i < 0 || i > RESVD_SET) 2221 errx(EX_DATAERR, 2222 "invalid set number %d\n", i); 2223 masks[which] |= (1<<i); 2224 } else if (_substrcmp(*av, "disable") == 0) 2225 which = 0; 2226 else if (_substrcmp(*av, "enable") == 0) 2227 which = 1; 2228 else 2229 errx(EX_DATAERR, 2230 "invalid set command %s\n", *av); 2231 av++; 2232 } 2233 if ( (masks[0] & masks[1]) != 0 ) 2234 errx(EX_DATAERR, 2235 "cannot enable and disable the same set\n"); 2236 2237 rt.set = masks[0]; 2238 rt.new_set = masks[1]; 2239 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2240 if (i) 2241 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2242 } else 2243 errx(EX_USAGE, "invalid set command %s\n", *av); 2244 } 2245 2246 void 2247 ipfw_sysctl_handler(char *av[], int which) 2248 { 2249 av++; 2250 2251 if (av[0] == NULL) { 2252 warnx("missing keyword to enable/disable\n"); 2253 } else if (_substrcmp(*av, "firewall") == 0) { 2254 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2255 &which, sizeof(which)); 2256 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2257 &which, sizeof(which)); 2258 } else if (_substrcmp(*av, "one_pass") == 0) { 2259 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2260 &which, sizeof(which)); 2261 } else if (_substrcmp(*av, "debug") == 0) { 2262 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2263 &which, sizeof(which)); 2264 } else if (_substrcmp(*av, "verbose") == 0) { 2265 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2266 &which, sizeof(which)); 2267 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2268 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2269 &which, sizeof(which)); 2270 #ifndef NO_ALTQ 2271 } else if (_substrcmp(*av, "altq") == 0) { 2272 altq_set_enabled(which); 2273 #endif 2274 } else { 2275 warnx("unrecognize enable/disable keyword: %s\n", *av); 2276 } 2277 } 2278 2279 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2280 void *arg, void *state); 2281 2282 static void 2283 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2284 void *arg, void *_state) 2285 { 2286 ipfw_dyn_rule *d; 2287 int width; 2288 uint8_t set; 2289 2290 d = (ipfw_dyn_rule *)_state; 2291 /* Count _ALL_ states */ 2292 fo->dcnt++; 2293 2294 if (fo->show_counters == 0) 2295 return; 2296 2297 if (co->use_set) { 2298 /* skip states from another set */ 2299 bcopy((char *)&d->rule + sizeof(uint16_t), &set, 2300 sizeof(uint8_t)); 2301 if (set != co->use_set - 1) 2302 return; 2303 } 2304 2305 width = pr_u64(NULL, &d->pcnt, 0); 2306 if (width > fo->pcwidth) 2307 fo->pcwidth = width; 2308 2309 width = pr_u64(NULL, &d->bcnt, 0); 2310 if (width > fo->bcwidth) 2311 fo->bcwidth = width; 2312 } 2313 2314 static int 2315 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2316 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2317 { 2318 int ttype; 2319 state_cb *fptr; 2320 void *farg; 2321 ipfw_obj_tlv *tlv; 2322 ipfw_obj_ctlv *ctlv; 2323 2324 fptr = NULL; 2325 ttype = 0; 2326 2327 while (sz > 0) { 2328 ctlv = (ipfw_obj_ctlv *)base; 2329 switch (ctlv->head.type) { 2330 case IPFW_TLV_DYNSTATE_LIST: 2331 base += sizeof(*ctlv); 2332 sz -= sizeof(*ctlv); 2333 ttype = IPFW_TLV_DYN_ENT; 2334 fptr = dyn_bc; 2335 farg = dyn_arg; 2336 break; 2337 default: 2338 return (sz); 2339 } 2340 2341 while (sz > 0) { 2342 tlv = (ipfw_obj_tlv *)base; 2343 if (tlv->type != ttype) 2344 break; 2345 2346 fptr(co, fo, farg, tlv + 1); 2347 sz -= tlv->length; 2348 base += tlv->length; 2349 } 2350 } 2351 2352 return (sz); 2353 } 2354 2355 static void 2356 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2357 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2358 { 2359 int bcwidth, pcwidth, width; 2360 int n; 2361 struct ip_fw_bcounter *cntr; 2362 struct ip_fw_rule *r; 2363 2364 bcwidth = 0; 2365 pcwidth = 0; 2366 if (fo->show_counters != 0) { 2367 for (n = 0; n < rcnt; n++, 2368 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2369 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2370 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2371 /* skip rules from another set */ 2372 if (co->use_set && r->set != co->use_set - 1) 2373 continue; 2374 2375 /* packet counter */ 2376 width = pr_u64(NULL, &cntr->pcnt, 0); 2377 if (width > pcwidth) 2378 pcwidth = width; 2379 2380 /* byte counter */ 2381 width = pr_u64(NULL, &cntr->bcnt, 0); 2382 if (width > bcwidth) 2383 bcwidth = width; 2384 } 2385 } 2386 fo->bcwidth = bcwidth; 2387 fo->pcwidth = pcwidth; 2388 2389 fo->dcnt = 0; 2390 if (co->do_dynamic && dynsz > 0) 2391 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2392 } 2393 2394 static int 2395 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2396 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2397 { 2398 int n, seen; 2399 struct ip_fw_rule *r; 2400 struct ip_fw_bcounter *cntr; 2401 int c = 0; 2402 2403 for (n = seen = 0; n < rcnt; n++, 2404 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2405 2406 if ((fo->show_counters | fo->show_time) != 0) { 2407 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2408 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2409 } else { 2410 cntr = NULL; 2411 r = (struct ip_fw_rule *)(rtlv + 1); 2412 } 2413 if (r->rulenum > fo->last) 2414 break; 2415 if (co->use_set && r->set != co->use_set - 1) 2416 continue; 2417 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2418 show_static_rule(co, fo, bp, r, cntr); 2419 printf("%s", bp->buf); 2420 c += rtlv->length; 2421 bp_flush(bp); 2422 seen++; 2423 } 2424 } 2425 2426 return (seen); 2427 } 2428 2429 static void 2430 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2431 void *_arg, void *_state) 2432 { 2433 uint16_t rulenum; 2434 uint8_t set; 2435 ipfw_dyn_rule *d; 2436 struct buf_pr *bp; 2437 2438 d = (ipfw_dyn_rule *)_state; 2439 bp = (struct buf_pr *)_arg; 2440 2441 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2442 if (rulenum > fo->last) 2443 return; 2444 if (co->use_set) { 2445 bcopy((char *)&d->rule + sizeof(uint16_t), 2446 &set, sizeof(uint8_t)); 2447 if (set != co->use_set - 1) 2448 return; 2449 } 2450 if (rulenum >= fo->first) { 2451 show_dyn_state(co, fo, bp, d); 2452 printf("%s\n", bp->buf); 2453 bp_flush(bp); 2454 } 2455 } 2456 2457 static int 2458 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2459 struct buf_pr *bp, caddr_t base, size_t sz) 2460 { 2461 2462 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2463 return (sz); 2464 } 2465 2466 void 2467 ipfw_list(int ac, char *av[], int show_counters) 2468 { 2469 ipfw_cfg_lheader *cfg; 2470 struct format_opts sfo; 2471 size_t sz; 2472 int error; 2473 int lac; 2474 char **lav; 2475 uint32_t rnum; 2476 char *endptr; 2477 2478 if (co.test_only) { 2479 fprintf(stderr, "Testing only, list disabled\n"); 2480 return; 2481 } 2482 if (co.do_pipe) { 2483 dummynet_list(ac, av, show_counters); 2484 return; 2485 } 2486 2487 ac--; 2488 av++; 2489 memset(&sfo, 0, sizeof(sfo)); 2490 2491 /* Determine rule range to request */ 2492 if (ac > 0) { 2493 for (lac = ac, lav = av; lac != 0; lac--) { 2494 rnum = strtoul(*lav++, &endptr, 10); 2495 if (sfo.first == 0 || rnum < sfo.first) 2496 sfo.first = rnum; 2497 2498 if (*endptr == '-') 2499 rnum = strtoul(endptr + 1, &endptr, 10); 2500 if (sfo.last == 0 || rnum > sfo.last) 2501 sfo.last = rnum; 2502 } 2503 } 2504 2505 /* get configuraion from kernel */ 2506 cfg = NULL; 2507 sfo.show_counters = show_counters; 2508 sfo.show_time = co.do_time; 2509 sfo.flags = IPFW_CFG_GET_STATIC; 2510 if (co.do_dynamic != 0) 2511 sfo.flags |= IPFW_CFG_GET_STATES; 2512 if ((sfo.show_counters | sfo.show_time) != 0) 2513 sfo.flags |= IPFW_CFG_GET_COUNTERS; 2514 if (ipfw_get_config(&co, &sfo, &cfg, &sz) != 0) 2515 err(EX_OSERR, "retrieving config failed"); 2516 2517 error = ipfw_show_config(&co, &sfo, cfg, sz, ac, av); 2518 2519 free(cfg); 2520 2521 if (error != EX_OK) 2522 exit(error); 2523 } 2524 2525 static int 2526 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 2527 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 2528 { 2529 caddr_t dynbase; 2530 size_t dynsz; 2531 int rcnt; 2532 int exitval = EX_OK; 2533 int lac; 2534 char **lav; 2535 char *endptr; 2536 size_t readsz; 2537 struct buf_pr bp; 2538 ipfw_obj_ctlv *ctlv, *tstate; 2539 ipfw_obj_tlv *rbase; 2540 2541 /* 2542 * Handle tablenames TLV first, if any 2543 */ 2544 tstate = NULL; 2545 rbase = NULL; 2546 dynbase = NULL; 2547 dynsz = 0; 2548 readsz = sizeof(*cfg); 2549 rcnt = 0; 2550 2551 fo->set_mask = cfg->set_mask; 2552 2553 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 2554 2555 if (cfg->flags & IPFW_CFG_GET_STATIC) { 2556 /* We've requested static rules */ 2557 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 2558 fo->tstate = ctlv; 2559 readsz += ctlv->head.length; 2560 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2561 ctlv->head.length); 2562 } 2563 2564 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 2565 rbase = (ipfw_obj_tlv *)(ctlv + 1); 2566 rcnt = ctlv->count; 2567 readsz += ctlv->head.length; 2568 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2569 ctlv->head.length); 2570 } 2571 } 2572 2573 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 2574 /* We may have some dynamic states */ 2575 dynsz = sz - readsz; 2576 /* Skip empty header */ 2577 if (dynsz != sizeof(ipfw_obj_ctlv)) 2578 dynbase = (caddr_t)ctlv; 2579 else 2580 dynsz = 0; 2581 } 2582 2583 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 2584 bp_alloc(&bp, 4096); 2585 2586 /* if no rule numbers were specified, list all rules */ 2587 if (ac == 0) { 2588 fo->first = 0; 2589 fo->last = IPFW_DEFAULT_RULE; 2590 list_static_range(co, fo, &bp, rbase, rcnt); 2591 2592 if (co->do_dynamic && dynsz > 0) { 2593 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, dynsz); 2594 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2595 } 2596 2597 bp_free(&bp); 2598 return (EX_OK); 2599 } 2600 2601 /* display specific rules requested on command line */ 2602 for (lac = ac, lav = av; lac != 0; lac--) { 2603 /* convert command line rule # */ 2604 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2605 if (*endptr == '-') 2606 fo->last = strtoul(endptr + 1, &endptr, 10); 2607 if (*endptr) { 2608 exitval = EX_USAGE; 2609 warnx("invalid rule number: %s", *(lav - 1)); 2610 continue; 2611 } 2612 2613 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 2614 /* give precedence to other error(s) */ 2615 if (exitval == EX_OK) 2616 exitval = EX_UNAVAILABLE; 2617 if (fo->first == fo->last) 2618 warnx("rule %u does not exist", fo->first); 2619 else 2620 warnx("no rules in range %u-%u", 2621 fo->first, fo->last); 2622 } 2623 } 2624 2625 if (co->do_dynamic && dynsz > 0) { 2626 printf("## Dynamic rules:\n"); 2627 for (lac = ac, lav = av; lac != 0; lac--) { 2628 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2629 if (*endptr == '-') 2630 fo->last = strtoul(endptr+1, &endptr, 10); 2631 if (*endptr) 2632 /* already warned */ 2633 continue; 2634 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2635 } 2636 } 2637 2638 bp_free(&bp); 2639 return (exitval); 2640 } 2641 2642 2643 /* 2644 * Retrieves current ipfw configuration of given type 2645 * and stores its pointer to @pcfg. 2646 * 2647 * Caller is responsible for freeing @pcfg. 2648 * 2649 * Returns 0 on success. 2650 */ 2651 2652 static int 2653 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 2654 ipfw_cfg_lheader **pcfg, size_t *psize) 2655 { 2656 ipfw_cfg_lheader *cfg; 2657 size_t sz; 2658 int i; 2659 2660 2661 if (co->test_only != 0) { 2662 fprintf(stderr, "Testing only, list disabled\n"); 2663 return (0); 2664 } 2665 2666 /* Start with some data size */ 2667 sz = 4096; 2668 cfg = NULL; 2669 2670 for (i = 0; i < 16; i++) { 2671 if (cfg != NULL) 2672 free(cfg); 2673 if ((cfg = calloc(1, sz)) == NULL) 2674 return (ENOMEM); 2675 2676 cfg->flags = fo->flags; 2677 cfg->start_rule = fo->first; 2678 cfg->end_rule = fo->last; 2679 2680 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 2681 if (errno != ENOMEM) { 2682 free(cfg); 2683 return (errno); 2684 } 2685 2686 /* Buffer size is not enough. Try to increase */ 2687 sz = sz * 2; 2688 if (sz < cfg->size) 2689 sz = cfg->size; 2690 continue; 2691 } 2692 2693 *pcfg = cfg; 2694 *psize = sz; 2695 return (0); 2696 } 2697 2698 free(cfg); 2699 return (ENOMEM); 2700 } 2701 2702 static int 2703 lookup_host (char *host, struct in_addr *ipaddr) 2704 { 2705 struct hostent *he; 2706 2707 if (!inet_aton(host, ipaddr)) { 2708 if ((he = gethostbyname(host)) == NULL) 2709 return(-1); 2710 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 2711 } 2712 return(0); 2713 } 2714 2715 struct tidx { 2716 ipfw_obj_ntlv *idx; 2717 uint32_t count; 2718 uint32_t size; 2719 uint16_t counter; 2720 uint8_t set; 2721 }; 2722 2723 static uint16_t 2724 pack_table(struct tidx *tstate, char *name) 2725 { 2726 int i; 2727 ipfw_obj_ntlv *ntlv; 2728 2729 if (table_check_name(name) != 0) 2730 return (0); 2731 2732 for (i = 0; i < tstate->count; i++) { 2733 if (strcmp(tstate->idx[i].name, name) != 0) 2734 continue; 2735 if (tstate->idx[i].set != tstate->set) 2736 continue; 2737 2738 return (tstate->idx[i].idx); 2739 } 2740 2741 if (tstate->count + 1 > tstate->size) { 2742 tstate->size += 4; 2743 tstate->idx = realloc(tstate->idx, tstate->size * 2744 sizeof(ipfw_obj_ntlv)); 2745 if (tstate->idx == NULL) 2746 return (0); 2747 } 2748 2749 ntlv = &tstate->idx[i]; 2750 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 2751 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 2752 ntlv->head.type = IPFW_TLV_TBL_NAME; 2753 ntlv->head.length = sizeof(ipfw_obj_ntlv); 2754 ntlv->set = tstate->set; 2755 ntlv->idx = ++tstate->counter; 2756 tstate->count++; 2757 2758 return (ntlv->idx); 2759 } 2760 2761 static void 2762 fill_table(ipfw_insn *cmd, char *av, uint8_t opcode, struct tidx *tstate) 2763 { 2764 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2765 uint16_t uidx; 2766 char *p; 2767 2768 if ((p = strchr(av + 6, ')')) == NULL) 2769 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 2770 *p = '\0'; 2771 p = strchr(av + 6, ','); 2772 if (p) 2773 *p++ = '\0'; 2774 2775 if ((uidx = pack_table(tstate, av + 6)) == 0) 2776 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 2777 2778 cmd->opcode = opcode; 2779 cmd->arg1 = uidx; 2780 if (p) { 2781 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 2782 d[0] = strtoul(p, NULL, 0); 2783 } else 2784 cmd->len |= F_INSN_SIZE(ipfw_insn); 2785 } 2786 2787 2788 /* 2789 * fills the addr and mask fields in the instruction as appropriate from av. 2790 * Update length as appropriate. 2791 * The following formats are allowed: 2792 * me returns O_IP_*_ME 2793 * 1.2.3.4 single IP address 2794 * 1.2.3.4:5.6.7.8 address:mask 2795 * 1.2.3.4/24 address/mask 2796 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 2797 * We can have multiple comma-separated address/mask entries. 2798 */ 2799 static void 2800 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 2801 { 2802 int len = 0; 2803 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 2804 2805 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 2806 2807 if (_substrcmp(av, "any") == 0) 2808 return; 2809 2810 if (_substrcmp(av, "me") == 0) { 2811 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 2812 return; 2813 } 2814 2815 if (strncmp(av, "table(", 6) == 0) { 2816 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 2817 return; 2818 } 2819 2820 while (av) { 2821 /* 2822 * After the address we can have '/' or ':' indicating a mask, 2823 * ',' indicating another address follows, '{' indicating a 2824 * set of addresses of unspecified size. 2825 */ 2826 char *t = NULL, *p = strpbrk(av, "/:,{"); 2827 int masklen; 2828 char md, nd = '\0'; 2829 2830 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len); 2831 2832 if (p) { 2833 md = *p; 2834 *p++ = '\0'; 2835 if ((t = strpbrk(p, ",{")) != NULL) { 2836 nd = *t; 2837 *t = '\0'; 2838 } 2839 } else 2840 md = '\0'; 2841 2842 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 2843 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 2844 switch (md) { 2845 case ':': 2846 if (!inet_aton(p, (struct in_addr *)&d[1])) 2847 errx(EX_DATAERR, "bad netmask ``%s''", p); 2848 break; 2849 case '/': 2850 masklen = atoi(p); 2851 if (masklen == 0) 2852 d[1] = htonl(0); /* mask */ 2853 else if (masklen > 32) 2854 errx(EX_DATAERR, "bad width ``%s''", p); 2855 else 2856 d[1] = htonl(~0 << (32 - masklen)); 2857 break; 2858 case '{': /* no mask, assume /24 and put back the '{' */ 2859 d[1] = htonl(~0 << (32 - 24)); 2860 *(--p) = md; 2861 break; 2862 2863 case ',': /* single address plus continuation */ 2864 *(--p) = md; 2865 /* FALLTHROUGH */ 2866 case 0: /* initialization value */ 2867 default: 2868 d[1] = htonl(~0); /* force /32 */ 2869 break; 2870 } 2871 d[0] &= d[1]; /* mask base address with mask */ 2872 if (t) 2873 *t = nd; 2874 /* find next separator */ 2875 if (p) 2876 p = strpbrk(p, ",{"); 2877 if (p && *p == '{') { 2878 /* 2879 * We have a set of addresses. They are stored as follows: 2880 * arg1 is the set size (powers of 2, 2..256) 2881 * addr is the base address IN HOST FORMAT 2882 * mask.. is an array of arg1 bits (rounded up to 2883 * the next multiple of 32) with bits set 2884 * for each host in the map. 2885 */ 2886 uint32_t *map = (uint32_t *)&cmd->mask; 2887 int low, high; 2888 int i = contigmask((uint8_t *)&(d[1]), 32); 2889 2890 if (len > 0) 2891 errx(EX_DATAERR, "address set cannot be in a list"); 2892 if (i < 24 || i > 31) 2893 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2894 cmd->o.arg1 = 1<<(32-i); /* map length */ 2895 d[0] = ntohl(d[0]); /* base addr in host format */ 2896 cmd->o.opcode = O_IP_DST_SET; /* default */ 2897 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2898 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2899 map[i] = 0; /* clear map */ 2900 2901 av = p + 1; 2902 low = d[0] & 0xff; 2903 high = low + cmd->o.arg1 - 1; 2904 /* 2905 * Here, i stores the previous value when we specify a range 2906 * of addresses within a mask, e.g. 45-63. i = -1 means we 2907 * have no previous value. 2908 */ 2909 i = -1; /* previous value in a range */ 2910 while (isdigit(*av)) { 2911 char *s; 2912 int a = strtol(av, &s, 0); 2913 2914 if (s == av) { /* no parameter */ 2915 if (*av != '}') 2916 errx(EX_DATAERR, "set not closed\n"); 2917 if (i != -1) 2918 errx(EX_DATAERR, "incomplete range %d-", i); 2919 break; 2920 } 2921 if (a < low || a > high) 2922 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2923 a, low, high); 2924 a -= low; 2925 if (i == -1) /* no previous in range */ 2926 i = a; 2927 else { /* check that range is valid */ 2928 if (i > a) 2929 errx(EX_DATAERR, "invalid range %d-%d", 2930 i+low, a+low); 2931 if (*s == '-') 2932 errx(EX_DATAERR, "double '-' in range"); 2933 } 2934 for (; i <= a; i++) 2935 map[i/32] |= 1<<(i & 31); 2936 i = -1; 2937 if (*s == '-') 2938 i = a; 2939 else if (*s == '}') 2940 break; 2941 av = s+1; 2942 } 2943 return; 2944 } 2945 av = p; 2946 if (av) /* then *av must be a ',' */ 2947 av++; 2948 2949 /* Check this entry */ 2950 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2951 /* 2952 * 'any' turns the entire list into a NOP. 2953 * 'not any' never matches, so it is removed from the 2954 * list unless it is the only item, in which case we 2955 * report an error. 2956 */ 2957 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2958 if (av == NULL && len == 0) /* only this entry */ 2959 errx(EX_DATAERR, "not any never matches"); 2960 } 2961 /* else do nothing and skip this entry */ 2962 return; 2963 } 2964 /* A single IP can be stored in an optimized format */ 2965 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 2966 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2967 return; 2968 } 2969 len += 2; /* two words... */ 2970 d += 2; 2971 } /* end while */ 2972 if (len + 1 > F_LEN_MASK) 2973 errx(EX_DATAERR, "address list too long"); 2974 cmd->o.len |= len+1; 2975 } 2976 2977 2978 /* n2mask sets n bits of the mask */ 2979 void 2980 n2mask(struct in6_addr *mask, int n) 2981 { 2982 static int minimask[9] = 2983 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 2984 u_char *p; 2985 2986 memset(mask, 0, sizeof(struct in6_addr)); 2987 p = (u_char *) mask; 2988 for (; n > 0; p++, n -= 8) { 2989 if (n >= 8) 2990 *p = 0xff; 2991 else 2992 *p = minimask[n]; 2993 } 2994 return; 2995 } 2996 2997 static void 2998 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2999 struct _s_x *flags, char *p) 3000 { 3001 char *e; 3002 uint32_t set = 0, clear = 0; 3003 3004 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3005 errx(EX_DATAERR, "invalid flag %s", e); 3006 3007 cmd->opcode = opcode; 3008 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3009 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3010 } 3011 3012 3013 void 3014 ipfw_delete(char *av[]) 3015 { 3016 int i; 3017 int exitval = EX_OK; 3018 int do_set = 0; 3019 ipfw_range_tlv rt; 3020 3021 av++; 3022 NEED1("missing rule specification"); 3023 memset(&rt, 0, sizeof(rt)); 3024 if ( *av && _substrcmp(*av, "set") == 0) { 3025 /* Do not allow using the following syntax: 3026 * ipfw set N delete set M 3027 */ 3028 if (co.use_set) 3029 errx(EX_DATAERR, "invalid syntax"); 3030 do_set = 1; /* delete set */ 3031 av++; 3032 } 3033 3034 /* Rule number */ 3035 while (*av && isdigit(**av)) { 3036 i = atoi(*av); av++; 3037 if (co.do_nat) { 3038 exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); 3039 if (exitval) { 3040 exitval = EX_UNAVAILABLE; 3041 warn("rule %u not available", i); 3042 } 3043 } else if (co.do_pipe) { 3044 exitval = ipfw_delete_pipe(co.do_pipe, i); 3045 } else { 3046 if (do_set != 0) { 3047 rt.set = i & 31; 3048 rt.flags = IPFW_RCFLAG_SET; 3049 } else { 3050 rt.start_rule = i & 0xffff; 3051 rt.end_rule = i & 0xffff; 3052 if (rt.start_rule == 0 && rt.end_rule == 0) 3053 rt.flags |= IPFW_RCFLAG_ALL; 3054 else 3055 rt.flags |= IPFW_RCFLAG_RANGE; 3056 if (co.use_set != 0) { 3057 rt.set = co.use_set - 1; 3058 rt.flags |= IPFW_RCFLAG_SET; 3059 } 3060 } 3061 i = do_range_cmd(IP_FW_XDEL, &rt); 3062 if (i != 0) { 3063 exitval = EX_UNAVAILABLE; 3064 warn("rule %u: setsockopt(IP_FW_XDEL)", 3065 rt.start_rule); 3066 } else if (rt.new_set == 0) { 3067 exitval = EX_UNAVAILABLE; 3068 if (rt.start_rule != rt.end_rule) 3069 warnx("no rules rules in %u-%u range", 3070 rt.start_rule, rt.end_rule); 3071 else 3072 warnx("rule %u not found", 3073 rt.start_rule); 3074 } 3075 } 3076 } 3077 if (exitval != EX_OK) 3078 exit(exitval); 3079 } 3080 3081 3082 /* 3083 * fill the interface structure. We do not check the name as we can 3084 * create interfaces dynamically, so checking them at insert time 3085 * makes relatively little sense. 3086 * Interface names containing '*', '?', or '[' are assumed to be shell 3087 * patterns which match interfaces. 3088 */ 3089 static void 3090 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3091 { 3092 char *p; 3093 uint16_t uidx; 3094 3095 cmd->name[0] = '\0'; 3096 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3097 3098 CHECK_CMDLEN; 3099 3100 /* Parse the interface or address */ 3101 if (strcmp(arg, "any") == 0) 3102 cmd->o.len = 0; /* effectively ignore this command */ 3103 else if (strncmp(arg, "table(", 6) == 0) { 3104 if ((p = strchr(arg + 6, ')')) == NULL) 3105 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3106 *p = '\0'; 3107 p = strchr(arg + 6, ','); 3108 if (p) 3109 *p++ = '\0'; 3110 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3111 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3112 3113 cmd->name[0] = '\1'; /* Special value indicating table */ 3114 cmd->p.kidx = uidx; 3115 } else if (!isdigit(*arg)) { 3116 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3117 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3118 } else if (!inet_aton(arg, &cmd->p.ip)) 3119 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3120 } 3121 3122 static void 3123 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3124 { 3125 int i; 3126 size_t l; 3127 char *ap, *ptr, *optr; 3128 struct ether_addr *mac; 3129 const char *macset = "0123456789abcdefABCDEF:"; 3130 3131 if (strcmp(p, "any") == 0) { 3132 for (i = 0; i < ETHER_ADDR_LEN; i++) 3133 addr[i] = mask[i] = 0; 3134 return; 3135 } 3136 3137 optr = ptr = strdup(p); 3138 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3139 l = strlen(ap); 3140 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3141 errx(EX_DATAERR, "Incorrect MAC address"); 3142 bcopy(mac, addr, ETHER_ADDR_LEN); 3143 } else 3144 errx(EX_DATAERR, "Incorrect MAC address"); 3145 3146 if (ptr != NULL) { /* we have mask? */ 3147 if (p[ptr - optr - 1] == '/') { /* mask len */ 3148 long ml = strtol(ptr, &ap, 10); 3149 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3150 errx(EX_DATAERR, "Incorrect mask length"); 3151 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3152 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3153 } else { /* mask */ 3154 l = strlen(ptr); 3155 if (strspn(ptr, macset) != l || 3156 (mac = ether_aton(ptr)) == NULL) 3157 errx(EX_DATAERR, "Incorrect mask"); 3158 bcopy(mac, mask, ETHER_ADDR_LEN); 3159 } 3160 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3161 for (i = 0; i < ETHER_ADDR_LEN; i++) 3162 mask[i] = 0xff; 3163 } 3164 for (i = 0; i < ETHER_ADDR_LEN; i++) 3165 addr[i] &= mask[i]; 3166 3167 free(optr); 3168 } 3169 3170 /* 3171 * helper function, updates the pointer to cmd with the length 3172 * of the current command, and also cleans up the first word of 3173 * the new command in case it has been clobbered before. 3174 */ 3175 static ipfw_insn * 3176 next_cmd(ipfw_insn *cmd, int *len) 3177 { 3178 *len -= F_LEN(cmd); 3179 CHECK_LENGTH(*len, 0); 3180 cmd += F_LEN(cmd); 3181 bzero(cmd, sizeof(*cmd)); 3182 return cmd; 3183 } 3184 3185 /* 3186 * Takes arguments and copies them into a comment 3187 */ 3188 static void 3189 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3190 { 3191 int i, l; 3192 char *p = (char *)(cmd + 1); 3193 3194 cmd->opcode = O_NOP; 3195 cmd->len = (cmd->len & (F_NOT | F_OR)); 3196 3197 /* Compute length of comment string. */ 3198 for (i = 0, l = 0; av[i] != NULL; i++) 3199 l += strlen(av[i]) + 1; 3200 if (l == 0) 3201 return; 3202 if (l > 84) 3203 errx(EX_DATAERR, 3204 "comment too long (max 80 chars)"); 3205 l = 1 + (l+3)/4; 3206 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3207 CHECK_CMDLEN; 3208 3209 for (i = 0; av[i] != NULL; i++) { 3210 strcpy(p, av[i]); 3211 p += strlen(av[i]); 3212 *p++ = ' '; 3213 } 3214 *(--p) = '\0'; 3215 } 3216 3217 /* 3218 * A function to fill simple commands of size 1. 3219 * Existing flags are preserved. 3220 */ 3221 static void 3222 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3223 { 3224 cmd->opcode = opcode; 3225 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3226 cmd->arg1 = arg; 3227 } 3228 3229 /* 3230 * Fetch and add the MAC address and type, with masks. This generates one or 3231 * two microinstructions, and returns the pointer to the last one. 3232 */ 3233 static ipfw_insn * 3234 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3235 { 3236 ipfw_insn_mac *mac; 3237 3238 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3239 errx(EX_DATAERR, "MAC dst src"); 3240 3241 cmd->opcode = O_MACADDR2; 3242 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3243 CHECK_CMDLEN; 3244 3245 mac = (ipfw_insn_mac *)cmd; 3246 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3247 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3248 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3249 return cmd; 3250 } 3251 3252 static ipfw_insn * 3253 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3254 { 3255 if (!av) 3256 errx(EX_DATAERR, "missing MAC type"); 3257 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3258 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3259 cblen); 3260 cmd->opcode = O_MAC_TYPE; 3261 return cmd; 3262 } else 3263 return NULL; 3264 } 3265 3266 static ipfw_insn * 3267 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3268 { 3269 struct protoent *pe; 3270 char *ep; 3271 int proto; 3272 3273 proto = strtol(av, &ep, 10); 3274 if (*ep != '\0' || proto <= 0) { 3275 if ((pe = getprotobyname(av)) == NULL) 3276 return NULL; 3277 proto = pe->p_proto; 3278 } 3279 3280 fill_cmd(cmd, O_PROTO, 0, proto); 3281 *protop = proto; 3282 return cmd; 3283 } 3284 3285 static ipfw_insn * 3286 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3287 { 3288 u_char proto = IPPROTO_IP; 3289 3290 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3291 ; /* do not set O_IP4 nor O_IP6 */ 3292 else if (strcmp(av, "ip4") == 0) 3293 /* explicit "just IPv4" rule */ 3294 fill_cmd(cmd, O_IP4, 0, 0); 3295 else if (strcmp(av, "ip6") == 0) { 3296 /* explicit "just IPv6" rule */ 3297 proto = IPPROTO_IPV6; 3298 fill_cmd(cmd, O_IP6, 0, 0); 3299 } else 3300 return add_proto0(cmd, av, protop); 3301 3302 *protop = proto; 3303 return cmd; 3304 } 3305 3306 static ipfw_insn * 3307 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3308 { 3309 u_char proto = IPPROTO_IP; 3310 3311 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3312 ; /* do not set O_IP4 nor O_IP6 */ 3313 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3314 /* explicit "just IPv4" rule */ 3315 fill_cmd(cmd, O_IP4, 0, 0); 3316 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3317 /* explicit "just IPv6" rule */ 3318 proto = IPPROTO_IPV6; 3319 fill_cmd(cmd, O_IP6, 0, 0); 3320 } else 3321 return add_proto0(cmd, av, protop); 3322 3323 *protop = proto; 3324 return cmd; 3325 } 3326 3327 static ipfw_insn * 3328 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3329 { 3330 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3331 if (cmd->opcode == O_IP_DST_SET) /* set */ 3332 cmd->opcode = O_IP_SRC_SET; 3333 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3334 cmd->opcode = O_IP_SRC_LOOKUP; 3335 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3336 cmd->opcode = O_IP_SRC_ME; 3337 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3338 cmd->opcode = O_IP_SRC; 3339 else /* addr/mask */ 3340 cmd->opcode = O_IP_SRC_MASK; 3341 return cmd; 3342 } 3343 3344 static ipfw_insn * 3345 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3346 { 3347 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3348 if (cmd->opcode == O_IP_DST_SET) /* set */ 3349 ; 3350 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3351 ; 3352 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3353 cmd->opcode = O_IP_DST_ME; 3354 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3355 cmd->opcode = O_IP_DST; 3356 else /* addr/mask */ 3357 cmd->opcode = O_IP_DST_MASK; 3358 return cmd; 3359 } 3360 3361 static struct _s_x f_reserved_keywords[] = { 3362 { "altq", TOK_OR }, 3363 { "//", TOK_OR }, 3364 { "diverted", TOK_OR }, 3365 { "dst-port", TOK_OR }, 3366 { "src-port", TOK_OR }, 3367 { "established", TOK_OR }, 3368 { "keep-state", TOK_OR }, 3369 { "frag", TOK_OR }, 3370 { "icmptypes", TOK_OR }, 3371 { "in", TOK_OR }, 3372 { "out", TOK_OR }, 3373 { "ip6", TOK_OR }, 3374 { "any", TOK_OR }, 3375 { "to", TOK_OR }, 3376 { "via", TOK_OR }, 3377 { "{", TOK_OR }, 3378 { NULL, 0 } /* terminator */ 3379 }; 3380 3381 static ipfw_insn * 3382 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3383 { 3384 3385 if (match_token(f_reserved_keywords, av) != -1) 3386 return (NULL); 3387 3388 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3389 /* XXX todo: check that we have a protocol with ports */ 3390 cmd->opcode = opcode; 3391 return cmd; 3392 } 3393 return NULL; 3394 } 3395 3396 static ipfw_insn * 3397 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3398 { 3399 struct in6_addr a; 3400 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3401 ipfw_insn *ret = NULL; 3402 int len; 3403 3404 /* Copy first address in set if needed */ 3405 if ((ch = strpbrk(av, "/,")) != NULL) { 3406 len = ch - av; 3407 strlcpy(buf, av, sizeof(buf)); 3408 if (len < sizeof(buf)) 3409 buf[len] = '\0'; 3410 host = buf; 3411 } else 3412 host = av; 3413 3414 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3415 inet_pton(AF_INET6, host, &a) == 1) 3416 ret = add_srcip6(cmd, av, cblen); 3417 /* XXX: should check for IPv4, not !IPv6 */ 3418 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3419 inet_pton(AF_INET6, host, &a) != 1)) 3420 ret = add_srcip(cmd, av, cblen, tstate); 3421 if (ret == NULL && strcmp(av, "any") != 0) 3422 ret = cmd; 3423 3424 return ret; 3425 } 3426 3427 static ipfw_insn * 3428 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3429 { 3430 struct in6_addr a; 3431 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3432 ipfw_insn *ret = NULL; 3433 int len; 3434 3435 /* Copy first address in set if needed */ 3436 if ((ch = strpbrk(av, "/,")) != NULL) { 3437 len = ch - av; 3438 strlcpy(buf, av, sizeof(buf)); 3439 if (len < sizeof(buf)) 3440 buf[len] = '\0'; 3441 host = buf; 3442 } else 3443 host = av; 3444 3445 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3446 inet_pton(AF_INET6, host, &a) == 1) 3447 ret = add_dstip6(cmd, av, cblen); 3448 /* XXX: should check for IPv4, not !IPv6 */ 3449 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3450 inet_pton(AF_INET6, host, &a) != 1)) 3451 ret = add_dstip(cmd, av, cblen, tstate); 3452 if (ret == NULL && strcmp(av, "any") != 0) 3453 ret = cmd; 3454 3455 return ret; 3456 } 3457 3458 /* 3459 * Parse arguments and assemble the microinstructions which make up a rule. 3460 * Rules are added into the 'rulebuf' and then copied in the correct order 3461 * into the actual rule. 3462 * 3463 * The syntax for a rule starts with the action, followed by 3464 * optional action parameters, and the various match patterns. 3465 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 3466 * (generated if the rule includes a keep-state option), then the 3467 * various match patterns, log/altq actions, and the actual action. 3468 * 3469 */ 3470 void 3471 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 3472 { 3473 /* 3474 * rules are added into the 'rulebuf' and then copied in 3475 * the correct order into the actual rule. 3476 * Some things that need to go out of order (prob, action etc.) 3477 * go into actbuf[]. 3478 */ 3479 static uint32_t actbuf[255], cmdbuf[255]; 3480 int rblen, ablen, cblen; 3481 3482 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 3483 ipfw_insn *first_cmd; /* first match pattern */ 3484 3485 struct ip_fw_rule *rule; 3486 3487 /* 3488 * various flags used to record that we entered some fields. 3489 */ 3490 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 3491 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 3492 size_t len; 3493 3494 int i; 3495 3496 int open_par = 0; /* open parenthesis ( */ 3497 3498 /* proto is here because it is used to fetch ports */ 3499 u_char proto = IPPROTO_IP; /* default protocol */ 3500 3501 double match_prob = 1; /* match probability, default is always match */ 3502 3503 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 3504 bzero(cmdbuf, sizeof(cmdbuf)); 3505 bzero(rbuf, *rbufsize); 3506 3507 rule = (struct ip_fw_rule *)rbuf; 3508 cmd = (ipfw_insn *)cmdbuf; 3509 action = (ipfw_insn *)actbuf; 3510 3511 rblen = *rbufsize / sizeof(uint32_t); 3512 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 3513 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 3514 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 3515 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 3516 3517 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 3518 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 3519 3520 av++; 3521 3522 /* [rule N] -- Rule number optional */ 3523 if (av[0] && isdigit(**av)) { 3524 rule->rulenum = atoi(*av); 3525 av++; 3526 } 3527 3528 /* [set N] -- set number (0..RESVD_SET), optional */ 3529 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 3530 int set = strtoul(av[1], NULL, 10); 3531 if (set < 0 || set > RESVD_SET) 3532 errx(EX_DATAERR, "illegal set %s", av[1]); 3533 rule->set = set; 3534 tstate->set = set; 3535 av += 2; 3536 } 3537 3538 /* [prob D] -- match probability, optional */ 3539 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 3540 match_prob = strtod(av[1], NULL); 3541 3542 if (match_prob <= 0 || match_prob > 1) 3543 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 3544 av += 2; 3545 } 3546 3547 /* action -- mandatory */ 3548 NEED1("missing action"); 3549 i = match_token(rule_actions, *av); 3550 av++; 3551 action->len = 1; /* default */ 3552 CHECK_ACTLEN; 3553 switch(i) { 3554 case TOK_CHECKSTATE: 3555 have_state = action; 3556 action->opcode = O_CHECK_STATE; 3557 break; 3558 3559 case TOK_ACCEPT: 3560 action->opcode = O_ACCEPT; 3561 break; 3562 3563 case TOK_DENY: 3564 action->opcode = O_DENY; 3565 action->arg1 = 0; 3566 break; 3567 3568 case TOK_REJECT: 3569 action->opcode = O_REJECT; 3570 action->arg1 = ICMP_UNREACH_HOST; 3571 break; 3572 3573 case TOK_RESET: 3574 action->opcode = O_REJECT; 3575 action->arg1 = ICMP_REJECT_RST; 3576 break; 3577 3578 case TOK_RESET6: 3579 action->opcode = O_UNREACH6; 3580 action->arg1 = ICMP6_UNREACH_RST; 3581 break; 3582 3583 case TOK_UNREACH: 3584 action->opcode = O_REJECT; 3585 NEED1("missing reject code"); 3586 fill_reject_code(&action->arg1, *av); 3587 av++; 3588 break; 3589 3590 case TOK_UNREACH6: 3591 action->opcode = O_UNREACH6; 3592 NEED1("missing unreach code"); 3593 fill_unreach6_code(&action->arg1, *av); 3594 av++; 3595 break; 3596 3597 case TOK_COUNT: 3598 action->opcode = O_COUNT; 3599 break; 3600 3601 case TOK_NAT: 3602 action->opcode = O_NAT; 3603 action->len = F_INSN_SIZE(ipfw_insn_nat); 3604 CHECK_ACTLEN; 3605 if (_substrcmp(*av, "global") == 0) { 3606 action->arg1 = 0; 3607 av++; 3608 break; 3609 } else 3610 goto chkarg; 3611 3612 case TOK_QUEUE: 3613 action->opcode = O_QUEUE; 3614 goto chkarg; 3615 case TOK_PIPE: 3616 action->opcode = O_PIPE; 3617 goto chkarg; 3618 case TOK_SKIPTO: 3619 action->opcode = O_SKIPTO; 3620 goto chkarg; 3621 case TOK_NETGRAPH: 3622 action->opcode = O_NETGRAPH; 3623 goto chkarg; 3624 case TOK_NGTEE: 3625 action->opcode = O_NGTEE; 3626 goto chkarg; 3627 case TOK_DIVERT: 3628 action->opcode = O_DIVERT; 3629 goto chkarg; 3630 case TOK_TEE: 3631 action->opcode = O_TEE; 3632 goto chkarg; 3633 case TOK_CALL: 3634 action->opcode = O_CALLRETURN; 3635 chkarg: 3636 if (!av[0]) 3637 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 3638 if (isdigit(**av)) { 3639 action->arg1 = strtoul(*av, NULL, 10); 3640 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 3641 errx(EX_DATAERR, "illegal argument for %s", 3642 *(av - 1)); 3643 } else if (_substrcmp(*av, "tablearg") == 0) { 3644 action->arg1 = IP_FW_TARG; 3645 } else if (i == TOK_DIVERT || i == TOK_TEE) { 3646 struct servent *s; 3647 setservent(1); 3648 s = getservbyname(av[0], "divert"); 3649 if (s != NULL) 3650 action->arg1 = ntohs(s->s_port); 3651 else 3652 errx(EX_DATAERR, "illegal divert/tee port"); 3653 } else 3654 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 3655 av++; 3656 break; 3657 3658 case TOK_FORWARD: { 3659 /* 3660 * Locate the address-port separator (':' or ','). 3661 * Could be one of the following: 3662 * hostname:port 3663 * IPv4 a.b.c.d,port 3664 * IPv4 a.b.c.d:port 3665 * IPv6 w:x:y::z,port 3666 * The ':' can only be used with hostname and IPv4 address. 3667 * XXX-BZ Should we also support [w:x:y::z]:port? 3668 */ 3669 struct sockaddr_storage result; 3670 struct addrinfo *res; 3671 char *s, *end; 3672 int family; 3673 u_short port_number; 3674 3675 NEED1("missing forward address[:port]"); 3676 3677 /* 3678 * locate the address-port separator (':' or ',') 3679 */ 3680 s = strchr(*av, ','); 3681 if (s == NULL) { 3682 /* Distinguish between IPv4:port and IPv6 cases. */ 3683 s = strchr(*av, ':'); 3684 if (s && strchr(s+1, ':')) 3685 s = NULL; /* no port */ 3686 } 3687 3688 port_number = 0; 3689 if (s != NULL) { 3690 /* Terminate host portion and set s to start of port. */ 3691 *(s++) = '\0'; 3692 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 3693 if (s == end) 3694 errx(EX_DATAERR, 3695 "illegal forwarding port ``%s''", s); 3696 port_number = (u_short)i; 3697 } 3698 3699 if (_substrcmp(*av, "tablearg") == 0) { 3700 family = PF_INET; 3701 ((struct sockaddr_in*)&result)->sin_addr.s_addr = 3702 INADDR_ANY; 3703 } else { 3704 /* 3705 * Resolve the host name or address to a family and a 3706 * network representation of the address. 3707 */ 3708 if (getaddrinfo(*av, NULL, NULL, &res)) 3709 errx(EX_DATAERR, NULL); 3710 /* Just use the first host in the answer. */ 3711 family = res->ai_family; 3712 memcpy(&result, res->ai_addr, res->ai_addrlen); 3713 freeaddrinfo(res); 3714 } 3715 3716 if (family == PF_INET) { 3717 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 3718 3719 action->opcode = O_FORWARD_IP; 3720 action->len = F_INSN_SIZE(ipfw_insn_sa); 3721 CHECK_ACTLEN; 3722 3723 /* 3724 * In the kernel we assume AF_INET and use only 3725 * sin_port and sin_addr. Remember to set sin_len as 3726 * the routing code seems to use it too. 3727 */ 3728 p->sa.sin_len = sizeof(struct sockaddr_in); 3729 p->sa.sin_family = AF_INET; 3730 p->sa.sin_port = port_number; 3731 p->sa.sin_addr.s_addr = 3732 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 3733 } else if (family == PF_INET6) { 3734 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 3735 3736 action->opcode = O_FORWARD_IP6; 3737 action->len = F_INSN_SIZE(ipfw_insn_sa6); 3738 CHECK_ACTLEN; 3739 3740 p->sa.sin6_len = sizeof(struct sockaddr_in6); 3741 p->sa.sin6_family = AF_INET6; 3742 p->sa.sin6_port = port_number; 3743 p->sa.sin6_flowinfo = 0; 3744 p->sa.sin6_scope_id = 0; 3745 /* No table support for v6 yet. */ 3746 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 3747 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 3748 } else { 3749 errx(EX_DATAERR, "Invalid address family in forward action"); 3750 } 3751 av++; 3752 break; 3753 } 3754 case TOK_COMMENT: 3755 /* pretend it is a 'count' rule followed by the comment */ 3756 action->opcode = O_COUNT; 3757 av--; /* go back... */ 3758 break; 3759 3760 case TOK_SETFIB: 3761 { 3762 int numfibs; 3763 size_t intsize = sizeof(int); 3764 3765 action->opcode = O_SETFIB; 3766 NEED1("missing fib number"); 3767 if (_substrcmp(*av, "tablearg") == 0) { 3768 action->arg1 = IP_FW_TARG; 3769 } else { 3770 action->arg1 = strtoul(*av, NULL, 10); 3771 if (sysctlbyname("net.fibs", &numfibs, &intsize, 3772 NULL, 0) == -1) 3773 errx(EX_DATAERR, "fibs not suported.\n"); 3774 if (action->arg1 >= numfibs) /* Temporary */ 3775 errx(EX_DATAERR, "fib too large.\n"); 3776 /* Add high-order bit to fib to make room for tablearg*/ 3777 action->arg1 |= 0x8000; 3778 } 3779 av++; 3780 break; 3781 } 3782 3783 case TOK_SETDSCP: 3784 { 3785 int code; 3786 3787 action->opcode = O_SETDSCP; 3788 NEED1("missing DSCP code"); 3789 if (_substrcmp(*av, "tablearg") == 0) { 3790 action->arg1 = IP_FW_TARG; 3791 } else if (isalpha(*av[0])) { 3792 if ((code = match_token(f_ipdscp, *av)) == -1) 3793 errx(EX_DATAERR, "Unknown DSCP code"); 3794 action->arg1 = code; 3795 } else 3796 action->arg1 = strtoul(*av, NULL, 10); 3797 /* Add high-order bit to DSCP to make room for tablearg */ 3798 if (action->arg1 != IP_FW_TARG) 3799 action->arg1 |= 0x8000; 3800 av++; 3801 break; 3802 } 3803 3804 case TOK_REASS: 3805 action->opcode = O_REASS; 3806 break; 3807 3808 case TOK_RETURN: 3809 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 3810 break; 3811 3812 default: 3813 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 3814 } 3815 action = next_cmd(action, &ablen); 3816 3817 /* 3818 * [altq queuename] -- altq tag, optional 3819 * [log [logamount N]] -- log, optional 3820 * 3821 * If they exist, it go first in the cmdbuf, but then it is 3822 * skipped in the copy section to the end of the buffer. 3823 */ 3824 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 3825 av++; 3826 switch (i) { 3827 case TOK_LOG: 3828 { 3829 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 3830 int l; 3831 3832 if (have_log) 3833 errx(EX_DATAERR, 3834 "log cannot be specified more than once"); 3835 have_log = (ipfw_insn *)c; 3836 cmd->len = F_INSN_SIZE(ipfw_insn_log); 3837 CHECK_CMDLEN; 3838 cmd->opcode = O_LOG; 3839 if (av[0] && _substrcmp(*av, "logamount") == 0) { 3840 av++; 3841 NEED1("logamount requires argument"); 3842 l = atoi(*av); 3843 if (l < 0) 3844 errx(EX_DATAERR, 3845 "logamount must be positive"); 3846 c->max_log = l; 3847 av++; 3848 } else { 3849 len = sizeof(c->max_log); 3850 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 3851 &c->max_log, &len, NULL, 0) == -1) { 3852 if (co.test_only) { 3853 c->max_log = 0; 3854 break; 3855 } 3856 errx(1, "sysctlbyname(\"%s\")", 3857 "net.inet.ip.fw.verbose_limit"); 3858 } 3859 } 3860 } 3861 break; 3862 3863 #ifndef NO_ALTQ 3864 case TOK_ALTQ: 3865 { 3866 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 3867 3868 NEED1("missing altq queue name"); 3869 if (have_altq) 3870 errx(EX_DATAERR, 3871 "altq cannot be specified more than once"); 3872 have_altq = (ipfw_insn *)a; 3873 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 3874 CHECK_CMDLEN; 3875 cmd->opcode = O_ALTQ; 3876 a->qid = altq_name_to_qid(*av); 3877 av++; 3878 } 3879 break; 3880 #endif 3881 3882 case TOK_TAG: 3883 case TOK_UNTAG: { 3884 uint16_t tag; 3885 3886 if (have_tag) 3887 errx(EX_USAGE, "tag and untag cannot be " 3888 "specified more than once"); 3889 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 3890 rule_action_params); 3891 have_tag = cmd; 3892 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 3893 av++; 3894 break; 3895 } 3896 3897 default: 3898 abort(); 3899 } 3900 cmd = next_cmd(cmd, &cblen); 3901 } 3902 3903 if (have_state) /* must be a check-state, we are done */ 3904 goto done; 3905 3906 #define OR_START(target) \ 3907 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 3908 if (open_par) \ 3909 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 3910 prev = NULL; \ 3911 open_par = 1; \ 3912 if ( (av[0])[1] == '\0') { \ 3913 av++; \ 3914 } else \ 3915 (*av)++; \ 3916 } \ 3917 target: \ 3918 3919 3920 #define CLOSE_PAR \ 3921 if (open_par) { \ 3922 if (av[0] && ( \ 3923 strcmp(*av, ")") == 0 || \ 3924 strcmp(*av, "}") == 0)) { \ 3925 prev = NULL; \ 3926 open_par = 0; \ 3927 av++; \ 3928 } else \ 3929 errx(EX_USAGE, "missing \")\"\n"); \ 3930 } 3931 3932 #define NOT_BLOCK \ 3933 if (av[0] && _substrcmp(*av, "not") == 0) { \ 3934 if (cmd->len & F_NOT) \ 3935 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 3936 cmd->len |= F_NOT; \ 3937 av++; \ 3938 } 3939 3940 #define OR_BLOCK(target) \ 3941 if (av[0] && _substrcmp(*av, "or") == 0) { \ 3942 if (prev == NULL || open_par == 0) \ 3943 errx(EX_DATAERR, "invalid OR block"); \ 3944 prev->len |= F_OR; \ 3945 av++; \ 3946 goto target; \ 3947 } \ 3948 CLOSE_PAR; 3949 3950 first_cmd = cmd; 3951 3952 #if 0 3953 /* 3954 * MAC addresses, optional. 3955 * If we have this, we skip the part "proto from src to dst" 3956 * and jump straight to the option parsing. 3957 */ 3958 NOT_BLOCK; 3959 NEED1("missing protocol"); 3960 if (_substrcmp(*av, "MAC") == 0 || 3961 _substrcmp(*av, "mac") == 0) { 3962 av++; /* the "MAC" keyword */ 3963 add_mac(cmd, av); /* exits in case of errors */ 3964 cmd = next_cmd(cmd); 3965 av += 2; /* dst-mac and src-mac */ 3966 NOT_BLOCK; 3967 NEED1("missing mac type"); 3968 if (add_mactype(cmd, av[0])) 3969 cmd = next_cmd(cmd); 3970 av++; /* any or mac-type */ 3971 goto read_options; 3972 } 3973 #endif 3974 3975 /* 3976 * protocol, mandatory 3977 */ 3978 OR_START(get_proto); 3979 NOT_BLOCK; 3980 NEED1("missing protocol"); 3981 if (add_proto_compat(cmd, *av, &proto)) { 3982 av++; 3983 if (F_LEN(cmd) != 0) { 3984 prev = cmd; 3985 cmd = next_cmd(cmd, &cblen); 3986 } 3987 } else if (first_cmd != cmd) { 3988 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3989 } else 3990 goto read_options; 3991 OR_BLOCK(get_proto); 3992 3993 /* 3994 * "from", mandatory 3995 */ 3996 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 3997 errx(EX_USAGE, "missing ``from''"); 3998 av++; 3999 4000 /* 4001 * source IP, mandatory 4002 */ 4003 OR_START(source_ip); 4004 NOT_BLOCK; /* optional "not" */ 4005 NEED1("missing source address"); 4006 if (add_src(cmd, *av, proto, cblen, tstate)) { 4007 av++; 4008 if (F_LEN(cmd) != 0) { /* ! any */ 4009 prev = cmd; 4010 cmd = next_cmd(cmd, &cblen); 4011 } 4012 } else 4013 errx(EX_USAGE, "bad source address %s", *av); 4014 OR_BLOCK(source_ip); 4015 4016 /* 4017 * source ports, optional 4018 */ 4019 NOT_BLOCK; /* optional "not" */ 4020 if ( av[0] != NULL ) { 4021 if (_substrcmp(*av, "any") == 0 || 4022 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4023 av++; 4024 if (F_LEN(cmd) != 0) 4025 cmd = next_cmd(cmd, &cblen); 4026 } 4027 } 4028 4029 /* 4030 * "to", mandatory 4031 */ 4032 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4033 errx(EX_USAGE, "missing ``to''"); 4034 av++; 4035 4036 /* 4037 * destination, mandatory 4038 */ 4039 OR_START(dest_ip); 4040 NOT_BLOCK; /* optional "not" */ 4041 NEED1("missing dst address"); 4042 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4043 av++; 4044 if (F_LEN(cmd) != 0) { /* ! any */ 4045 prev = cmd; 4046 cmd = next_cmd(cmd, &cblen); 4047 } 4048 } else 4049 errx( EX_USAGE, "bad destination address %s", *av); 4050 OR_BLOCK(dest_ip); 4051 4052 /* 4053 * dest. ports, optional 4054 */ 4055 NOT_BLOCK; /* optional "not" */ 4056 if (av[0]) { 4057 if (_substrcmp(*av, "any") == 0 || 4058 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4059 av++; 4060 if (F_LEN(cmd) != 0) 4061 cmd = next_cmd(cmd, &cblen); 4062 } 4063 } 4064 4065 read_options: 4066 if (av[0] && first_cmd == cmd) { 4067 /* 4068 * nothing specified so far, store in the rule to ease 4069 * printout later. 4070 */ 4071 rule->flags |= IPFW_RULE_NOOPT; 4072 } 4073 prev = NULL; 4074 while ( av[0] != NULL ) { 4075 char *s; 4076 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4077 4078 s = *av; 4079 cmd32 = (ipfw_insn_u32 *)cmd; 4080 4081 if (*s == '!') { /* alternate syntax for NOT */ 4082 if (cmd->len & F_NOT) 4083 errx(EX_USAGE, "double \"not\" not allowed\n"); 4084 cmd->len = F_NOT; 4085 s++; 4086 } 4087 i = match_token(rule_options, s); 4088 av++; 4089 switch(i) { 4090 case TOK_NOT: 4091 if (cmd->len & F_NOT) 4092 errx(EX_USAGE, "double \"not\" not allowed\n"); 4093 cmd->len = F_NOT; 4094 break; 4095 4096 case TOK_OR: 4097 if (open_par == 0 || prev == NULL) 4098 errx(EX_USAGE, "invalid \"or\" block\n"); 4099 prev->len |= F_OR; 4100 break; 4101 4102 case TOK_STARTBRACE: 4103 if (open_par) 4104 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4105 open_par = 1; 4106 break; 4107 4108 case TOK_ENDBRACE: 4109 if (!open_par) 4110 errx(EX_USAGE, "+missing \")\"\n"); 4111 open_par = 0; 4112 prev = NULL; 4113 break; 4114 4115 case TOK_IN: 4116 fill_cmd(cmd, O_IN, 0, 0); 4117 break; 4118 4119 case TOK_OUT: 4120 cmd->len ^= F_NOT; /* toggle F_NOT */ 4121 fill_cmd(cmd, O_IN, 0, 0); 4122 break; 4123 4124 case TOK_DIVERTED: 4125 fill_cmd(cmd, O_DIVERTED, 0, 3); 4126 break; 4127 4128 case TOK_DIVERTEDLOOPBACK: 4129 fill_cmd(cmd, O_DIVERTED, 0, 1); 4130 break; 4131 4132 case TOK_DIVERTEDOUTPUT: 4133 fill_cmd(cmd, O_DIVERTED, 0, 2); 4134 break; 4135 4136 case TOK_FRAG: 4137 fill_cmd(cmd, O_FRAG, 0, 0); 4138 break; 4139 4140 case TOK_LAYER2: 4141 fill_cmd(cmd, O_LAYER2, 0, 0); 4142 break; 4143 4144 case TOK_XMIT: 4145 case TOK_RECV: 4146 case TOK_VIA: 4147 NEED1("recv, xmit, via require interface name" 4148 " or address"); 4149 fill_iface((ipfw_insn_if *)cmd, av[0], cblen, tstate); 4150 av++; 4151 if (F_LEN(cmd) == 0) /* not a valid address */ 4152 break; 4153 if (i == TOK_XMIT) 4154 cmd->opcode = O_XMIT; 4155 else if (i == TOK_RECV) 4156 cmd->opcode = O_RECV; 4157 else if (i == TOK_VIA) 4158 cmd->opcode = O_VIA; 4159 break; 4160 4161 case TOK_ICMPTYPES: 4162 NEED1("icmptypes requires list of types"); 4163 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 4164 av++; 4165 break; 4166 4167 case TOK_ICMP6TYPES: 4168 NEED1("icmptypes requires list of types"); 4169 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 4170 av++; 4171 break; 4172 4173 case TOK_IPTTL: 4174 NEED1("ipttl requires TTL"); 4175 if (strpbrk(*av, "-,")) { 4176 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 4177 errx(EX_DATAERR, "invalid ipttl %s", *av); 4178 } else 4179 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 4180 av++; 4181 break; 4182 4183 case TOK_IPID: 4184 NEED1("ipid requires id"); 4185 if (strpbrk(*av, "-,")) { 4186 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 4187 errx(EX_DATAERR, "invalid ipid %s", *av); 4188 } else 4189 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 4190 av++; 4191 break; 4192 4193 case TOK_IPLEN: 4194 NEED1("iplen requires length"); 4195 if (strpbrk(*av, "-,")) { 4196 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 4197 errx(EX_DATAERR, "invalid ip len %s", *av); 4198 } else 4199 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 4200 av++; 4201 break; 4202 4203 case TOK_IPVER: 4204 NEED1("ipver requires version"); 4205 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 4206 av++; 4207 break; 4208 4209 case TOK_IPPRECEDENCE: 4210 NEED1("ipprecedence requires value"); 4211 fill_cmd(cmd, O_IPPRECEDENCE, 0, 4212 (strtoul(*av, NULL, 0) & 7) << 5); 4213 av++; 4214 break; 4215 4216 case TOK_DSCP: 4217 NEED1("missing DSCP code"); 4218 fill_dscp(cmd, *av, cblen); 4219 av++; 4220 break; 4221 4222 case TOK_IPOPTS: 4223 NEED1("missing argument for ipoptions"); 4224 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 4225 av++; 4226 break; 4227 4228 case TOK_IPTOS: 4229 NEED1("missing argument for iptos"); 4230 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 4231 av++; 4232 break; 4233 4234 case TOK_UID: 4235 NEED1("uid requires argument"); 4236 { 4237 char *end; 4238 uid_t uid; 4239 struct passwd *pwd; 4240 4241 cmd->opcode = O_UID; 4242 uid = strtoul(*av, &end, 0); 4243 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 4244 if (pwd == NULL) 4245 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 4246 cmd32->d[0] = pwd->pw_uid; 4247 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4248 av++; 4249 } 4250 break; 4251 4252 case TOK_GID: 4253 NEED1("gid requires argument"); 4254 { 4255 char *end; 4256 gid_t gid; 4257 struct group *grp; 4258 4259 cmd->opcode = O_GID; 4260 gid = strtoul(*av, &end, 0); 4261 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 4262 if (grp == NULL) 4263 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 4264 cmd32->d[0] = grp->gr_gid; 4265 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4266 av++; 4267 } 4268 break; 4269 4270 case TOK_JAIL: 4271 NEED1("jail requires argument"); 4272 { 4273 char *end; 4274 int jid; 4275 4276 cmd->opcode = O_JAIL; 4277 jid = (int)strtol(*av, &end, 0); 4278 if (jid < 0 || *end != '\0') 4279 errx(EX_DATAERR, "jail requires prison ID"); 4280 cmd32->d[0] = (uint32_t)jid; 4281 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4282 av++; 4283 } 4284 break; 4285 4286 case TOK_ESTAB: 4287 fill_cmd(cmd, O_ESTAB, 0, 0); 4288 break; 4289 4290 case TOK_SETUP: 4291 fill_cmd(cmd, O_TCPFLAGS, 0, 4292 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 4293 break; 4294 4295 case TOK_TCPDATALEN: 4296 NEED1("tcpdatalen requires length"); 4297 if (strpbrk(*av, "-,")) { 4298 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 4299 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 4300 } else 4301 fill_cmd(cmd, O_TCPDATALEN, 0, 4302 strtoul(*av, NULL, 0)); 4303 av++; 4304 break; 4305 4306 case TOK_TCPOPTS: 4307 NEED1("missing argument for tcpoptions"); 4308 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 4309 av++; 4310 break; 4311 4312 case TOK_TCPSEQ: 4313 case TOK_TCPACK: 4314 NEED1("tcpseq/tcpack requires argument"); 4315 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 4316 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 4317 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 4318 av++; 4319 break; 4320 4321 case TOK_TCPWIN: 4322 NEED1("tcpwin requires length"); 4323 if (strpbrk(*av, "-,")) { 4324 if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen)) 4325 errx(EX_DATAERR, "invalid tcpwin len %s", *av); 4326 } else 4327 fill_cmd(cmd, O_TCPWIN, 0, 4328 strtoul(*av, NULL, 0)); 4329 av++; 4330 break; 4331 4332 case TOK_TCPFLAGS: 4333 NEED1("missing argument for tcpflags"); 4334 cmd->opcode = O_TCPFLAGS; 4335 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 4336 av++; 4337 break; 4338 4339 case TOK_KEEPSTATE: 4340 if (open_par) 4341 errx(EX_USAGE, "keep-state cannot be part " 4342 "of an or block"); 4343 if (have_state) 4344 errx(EX_USAGE, "only one of keep-state " 4345 "and limit is allowed"); 4346 have_state = cmd; 4347 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 4348 break; 4349 4350 case TOK_LIMIT: { 4351 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 4352 int val; 4353 4354 if (open_par) 4355 errx(EX_USAGE, 4356 "limit cannot be part of an or block"); 4357 if (have_state) 4358 errx(EX_USAGE, "only one of keep-state and " 4359 "limit is allowed"); 4360 have_state = cmd; 4361 4362 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 4363 CHECK_CMDLEN; 4364 cmd->opcode = O_LIMIT; 4365 c->limit_mask = c->conn_limit = 0; 4366 4367 while ( av[0] != NULL ) { 4368 if ((val = match_token(limit_masks, *av)) <= 0) 4369 break; 4370 c->limit_mask |= val; 4371 av++; 4372 } 4373 4374 if (c->limit_mask == 0) 4375 errx(EX_USAGE, "limit: missing limit mask"); 4376 4377 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 4378 TOK_LIMIT, rule_options); 4379 4380 av++; 4381 break; 4382 } 4383 4384 case TOK_PROTO: 4385 NEED1("missing protocol"); 4386 if (add_proto(cmd, *av, &proto)) { 4387 av++; 4388 } else 4389 errx(EX_DATAERR, "invalid protocol ``%s''", 4390 *av); 4391 break; 4392 4393 case TOK_SRCIP: 4394 NEED1("missing source IP"); 4395 if (add_srcip(cmd, *av, cblen, tstate)) { 4396 av++; 4397 } 4398 break; 4399 4400 case TOK_DSTIP: 4401 NEED1("missing destination IP"); 4402 if (add_dstip(cmd, *av, cblen, tstate)) { 4403 av++; 4404 } 4405 break; 4406 4407 case TOK_SRCIP6: 4408 NEED1("missing source IP6"); 4409 if (add_srcip6(cmd, *av, cblen)) { 4410 av++; 4411 } 4412 break; 4413 4414 case TOK_DSTIP6: 4415 NEED1("missing destination IP6"); 4416 if (add_dstip6(cmd, *av, cblen)) { 4417 av++; 4418 } 4419 break; 4420 4421 case TOK_SRCPORT: 4422 NEED1("missing source port"); 4423 if (_substrcmp(*av, "any") == 0 || 4424 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4425 av++; 4426 } else 4427 errx(EX_DATAERR, "invalid source port %s", *av); 4428 break; 4429 4430 case TOK_DSTPORT: 4431 NEED1("missing destination port"); 4432 if (_substrcmp(*av, "any") == 0 || 4433 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4434 av++; 4435 } else 4436 errx(EX_DATAERR, "invalid destination port %s", 4437 *av); 4438 break; 4439 4440 case TOK_MAC: 4441 if (add_mac(cmd, av, cblen)) 4442 av += 2; 4443 break; 4444 4445 case TOK_MACTYPE: 4446 NEED1("missing mac type"); 4447 if (!add_mactype(cmd, *av, cblen)) 4448 errx(EX_DATAERR, "invalid mac type %s", *av); 4449 av++; 4450 break; 4451 4452 case TOK_VERREVPATH: 4453 fill_cmd(cmd, O_VERREVPATH, 0, 0); 4454 break; 4455 4456 case TOK_VERSRCREACH: 4457 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 4458 break; 4459 4460 case TOK_ANTISPOOF: 4461 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 4462 break; 4463 4464 case TOK_IPSEC: 4465 fill_cmd(cmd, O_IPSEC, 0, 0); 4466 break; 4467 4468 case TOK_IPV6: 4469 fill_cmd(cmd, O_IP6, 0, 0); 4470 break; 4471 4472 case TOK_IPV4: 4473 fill_cmd(cmd, O_IP4, 0, 0); 4474 break; 4475 4476 case TOK_EXT6HDR: 4477 fill_ext6hdr( cmd, *av ); 4478 av++; 4479 break; 4480 4481 case TOK_FLOWID: 4482 if (proto != IPPROTO_IPV6 ) 4483 errx( EX_USAGE, "flow-id filter is active " 4484 "only for ipv6 protocol\n"); 4485 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 4486 av++; 4487 break; 4488 4489 case TOK_COMMENT: 4490 fill_comment(cmd, av, cblen); 4491 av[0]=NULL; 4492 break; 4493 4494 case TOK_TAGGED: 4495 if (av[0] && strpbrk(*av, "-,")) { 4496 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 4497 errx(EX_DATAERR, "tagged: invalid tag" 4498 " list: %s", *av); 4499 } 4500 else { 4501 uint16_t tag; 4502 4503 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 4504 TOK_TAGGED, rule_options); 4505 fill_cmd(cmd, O_TAGGED, 0, tag); 4506 } 4507 av++; 4508 break; 4509 4510 case TOK_FIB: 4511 NEED1("fib requires fib number"); 4512 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 4513 av++; 4514 break; 4515 case TOK_SOCKARG: 4516 fill_cmd(cmd, O_SOCKARG, 0, 0); 4517 break; 4518 4519 case TOK_LOOKUP: { 4520 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 4521 int j; 4522 4523 if (!av[0] || !av[1]) 4524 errx(EX_USAGE, "format: lookup argument tablenum"); 4525 cmd->opcode = O_IP_DST_LOOKUP; 4526 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 4527 i = match_token(rule_options, *av); 4528 for (j = 0; lookup_key[j] >= 0 ; j++) { 4529 if (i == lookup_key[j]) 4530 break; 4531 } 4532 if (lookup_key[j] <= 0) 4533 errx(EX_USAGE, "format: cannot lookup on %s", *av); 4534 __PAST_END(c->d, 1) = j; // i converted to option 4535 av++; 4536 4537 if ((j = pack_table(tstate, *av)) == 0) 4538 errx(EX_DATAERR, "Invalid table name: %s", *av); 4539 4540 cmd->arg1 = j; 4541 av++; 4542 } 4543 break; 4544 case TOK_FLOW: 4545 NEED1("missing table name"); 4546 if (strncmp(*av, "table(", 6) != 0) 4547 errx(EX_DATAERR, 4548 "enclose table name into \"table()\""); 4549 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 4550 av++; 4551 break; 4552 4553 default: 4554 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 4555 } 4556 if (F_LEN(cmd) > 0) { /* prepare to advance */ 4557 prev = cmd; 4558 cmd = next_cmd(cmd, &cblen); 4559 } 4560 } 4561 4562 done: 4563 /* 4564 * Now copy stuff into the rule. 4565 * If we have a keep-state option, the first instruction 4566 * must be a PROBE_STATE (which is generated here). 4567 * If we have a LOG option, it was stored as the first command, 4568 * and now must be moved to the top of the action part. 4569 */ 4570 dst = (ipfw_insn *)rule->cmd; 4571 4572 /* 4573 * First thing to write into the command stream is the match probability. 4574 */ 4575 if (match_prob != 1) { /* 1 means always match */ 4576 dst->opcode = O_PROB; 4577 dst->len = 2; 4578 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 4579 dst += dst->len; 4580 } 4581 4582 /* 4583 * generate O_PROBE_STATE if necessary 4584 */ 4585 if (have_state && have_state->opcode != O_CHECK_STATE) { 4586 fill_cmd(dst, O_PROBE_STATE, 0, 0); 4587 dst = next_cmd(dst, &rblen); 4588 } 4589 4590 /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ 4591 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 4592 i = F_LEN(src); 4593 CHECK_RBUFLEN(i); 4594 4595 switch (src->opcode) { 4596 case O_LOG: 4597 case O_KEEP_STATE: 4598 case O_LIMIT: 4599 case O_ALTQ: 4600 case O_TAG: 4601 break; 4602 default: 4603 bcopy(src, dst, i * sizeof(uint32_t)); 4604 dst += i; 4605 } 4606 } 4607 4608 /* 4609 * put back the have_state command as last opcode 4610 */ 4611 if (have_state && have_state->opcode != O_CHECK_STATE) { 4612 i = F_LEN(have_state); 4613 CHECK_RBUFLEN(i); 4614 bcopy(have_state, dst, i * sizeof(uint32_t)); 4615 dst += i; 4616 } 4617 /* 4618 * start action section 4619 */ 4620 rule->act_ofs = dst - rule->cmd; 4621 4622 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 4623 if (have_log) { 4624 i = F_LEN(have_log); 4625 CHECK_RBUFLEN(i); 4626 bcopy(have_log, dst, i * sizeof(uint32_t)); 4627 dst += i; 4628 } 4629 if (have_altq) { 4630 i = F_LEN(have_altq); 4631 CHECK_RBUFLEN(i); 4632 bcopy(have_altq, dst, i * sizeof(uint32_t)); 4633 dst += i; 4634 } 4635 if (have_tag) { 4636 i = F_LEN(have_tag); 4637 CHECK_RBUFLEN(i); 4638 bcopy(have_tag, dst, i * sizeof(uint32_t)); 4639 dst += i; 4640 } 4641 4642 /* 4643 * copy all other actions 4644 */ 4645 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 4646 i = F_LEN(src); 4647 CHECK_RBUFLEN(i); 4648 bcopy(src, dst, i * sizeof(uint32_t)); 4649 dst += i; 4650 } 4651 4652 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 4653 *rbufsize = (char *)dst - (char *)rule; 4654 } 4655 4656 /* 4657 * Adds one or more rules to ipfw chain. 4658 * Data layout: 4659 * Request: 4660 * [ 4661 * ip_fw3_opheader 4662 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 4663 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 4664 * ] 4665 * Reply: 4666 * [ 4667 * ip_fw3_opheader 4668 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 4669 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 4670 * ] 4671 * 4672 * Rules in reply are modified to store their actual ruleset number. 4673 * 4674 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 4675 * accoring to their idx field and there has to be no duplicates. 4676 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 4677 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 4678 */ 4679 void 4680 ipfw_add(char *av[]) 4681 { 4682 uint32_t rulebuf[1024]; 4683 int rbufsize, default_off, tlen, rlen; 4684 size_t sz; 4685 struct tidx ts; 4686 struct ip_fw_rule *rule; 4687 caddr_t tbuf; 4688 ip_fw3_opheader *op3; 4689 ipfw_obj_ctlv *ctlv, *tstate; 4690 4691 rbufsize = sizeof(rulebuf); 4692 memset(rulebuf, 0, rbufsize); 4693 memset(&ts, 0, sizeof(ts)); 4694 4695 /* Optimize case with no tables */ 4696 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 4697 op3 = (ip_fw3_opheader *)rulebuf; 4698 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 4699 rule = (struct ip_fw_rule *)(ctlv + 1); 4700 rbufsize -= default_off; 4701 4702 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 4703 /* Align rule size to u64 boundary */ 4704 rlen = roundup2(rbufsize, sizeof(uint64_t)); 4705 4706 tbuf = NULL; 4707 sz = 0; 4708 tstate = NULL; 4709 if (ts.count != 0) { 4710 /* Some tables. We have to alloc more data */ 4711 tlen = ts.count * sizeof(ipfw_obj_ntlv); 4712 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 4713 4714 if ((tbuf = calloc(1, sz)) == NULL) 4715 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 4716 op3 = (ip_fw3_opheader *)tbuf; 4717 /* Tables first */ 4718 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 4719 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 4720 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 4721 ctlv->count = ts.count; 4722 ctlv->objsize = sizeof(ipfw_obj_ntlv); 4723 memcpy(ctlv + 1, ts.idx, tlen); 4724 table_sort_ctlv(ctlv); 4725 tstate = ctlv; 4726 /* Rule next */ 4727 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 4728 ctlv->head.type = IPFW_TLV_RULE_LIST; 4729 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 4730 ctlv->count = 1; 4731 memcpy(ctlv + 1, rule, rbufsize); 4732 } else { 4733 /* Simply add header */ 4734 sz = rlen + default_off; 4735 memset(ctlv, 0, sizeof(*ctlv)); 4736 ctlv->head.type = IPFW_TLV_RULE_LIST; 4737 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 4738 ctlv->count = 1; 4739 } 4740 4741 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 4742 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 4743 4744 if (!co.do_quiet) { 4745 struct format_opts sfo; 4746 struct buf_pr bp; 4747 memset(&sfo, 0, sizeof(sfo)); 4748 sfo.tstate = tstate; 4749 sfo.set_mask = (uint32_t)(-1); 4750 bp_alloc(&bp, 4096); 4751 show_static_rule(&co, &sfo, &bp, rule, NULL); 4752 printf("%s", bp.buf); 4753 bp_free(&bp); 4754 } 4755 4756 if (tbuf != NULL) 4757 free(tbuf); 4758 4759 if (ts.idx != NULL) 4760 free(ts.idx); 4761 } 4762 4763 /* 4764 * clear the counters or the log counters. 4765 * optname has the following values: 4766 * 0 (zero both counters and logging) 4767 * 1 (zero logging only) 4768 */ 4769 void 4770 ipfw_zero(int ac, char *av[], int optname) 4771 { 4772 ipfw_range_tlv rt; 4773 uint32_t arg; 4774 int failed = EX_OK; 4775 char const *errstr; 4776 char const *name = optname ? "RESETLOG" : "ZERO"; 4777 4778 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 4779 memset(&rt, 0, sizeof(rt)); 4780 4781 av++; ac--; 4782 4783 if (ac == 0) { 4784 /* clear all entries */ 4785 rt.flags = IPFW_RCFLAG_ALL; 4786 if (do_range_cmd(optname, &rt) < 0) 4787 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 4788 if (!co.do_quiet) 4789 printf("%s.\n", optname == IP_FW_XZERO ? 4790 "Accounting cleared":"Logging counts reset"); 4791 4792 return; 4793 } 4794 4795 while (ac) { 4796 /* Rule number */ 4797 if (isdigit(**av)) { 4798 arg = strtonum(*av, 0, 0xffff, &errstr); 4799 if (errstr) 4800 errx(EX_DATAERR, 4801 "invalid rule number %s\n", *av); 4802 rt.start_rule = arg; 4803 rt.end_rule = arg; 4804 rt.flags |= IPFW_RCFLAG_RANGE; 4805 if (co.use_set != 0) { 4806 rt.set = co.use_set - 1; 4807 rt.flags |= IPFW_RCFLAG_SET; 4808 } 4809 if (do_range_cmd(optname, &rt) != 0) { 4810 warn("rule %u: setsockopt(IP_FW_X%s)", 4811 arg, name); 4812 failed = EX_UNAVAILABLE; 4813 } else if (rt.new_set == 0) { 4814 printf("Entry %d not found\n", arg); 4815 failed = EX_UNAVAILABLE; 4816 } else if (!co.do_quiet) 4817 printf("Entry %d %s.\n", arg, 4818 optname == IP_FW_XZERO ? 4819 "cleared" : "logging count reset"); 4820 } else { 4821 errx(EX_USAGE, "invalid rule number ``%s''", *av); 4822 } 4823 av++; ac--; 4824 } 4825 if (failed != EX_OK) 4826 exit(failed); 4827 } 4828 4829 void 4830 ipfw_flush(int force) 4831 { 4832 ipfw_range_tlv rt; 4833 4834 if (!force && !co.do_quiet) { /* need to ask user */ 4835 int c; 4836 4837 printf("Are you sure? [yn] "); 4838 fflush(stdout); 4839 do { 4840 c = toupper(getc(stdin)); 4841 while (c != '\n' && getc(stdin) != '\n') 4842 if (feof(stdin)) 4843 return; /* and do not flush */ 4844 } while (c != 'Y' && c != 'N'); 4845 printf("\n"); 4846 if (c == 'N') /* user said no */ 4847 return; 4848 } 4849 if (co.do_pipe) { 4850 dummynet_flush(); 4851 return; 4852 } 4853 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 4854 memset(&rt, 0, sizeof(rt)); 4855 if (co.use_set != 0) { 4856 rt.set = co.use_set - 1; 4857 rt.flags = IPFW_RCFLAG_SET; 4858 } else 4859 rt.flags = IPFW_RCFLAG_ALL; 4860 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 4861 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 4862 if (!co.do_quiet) 4863 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); 4864 } 4865 4866 static struct _s_x intcmds[] = { 4867 { "talist", TOK_TALIST }, 4868 { "iflist", TOK_IFLIST }, 4869 { "vlist", TOK_VLIST }, 4870 { NULL, 0 } 4871 }; 4872 4873 void 4874 ipfw_internal_handler(int ac, char *av[]) 4875 { 4876 int tcmd; 4877 4878 ac--; av++; 4879 NEED1("internal cmd required"); 4880 4881 if ((tcmd = match_token(intcmds, *av)) == -1) 4882 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 4883 4884 switch (tcmd) { 4885 case TOK_IFLIST: 4886 ipfw_list_tifaces(); 4887 break; 4888 case TOK_TALIST: 4889 ipfw_list_ta(ac, av); 4890 break; 4891 case TOK_VLIST: 4892 ipfw_list_values(ac, av); 4893 break; 4894 } 4895 } 4896 4897 static int 4898 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 4899 { 4900 ipfw_obj_lheader req, *olh; 4901 size_t sz; 4902 4903 memset(&req, 0, sizeof(req)); 4904 sz = sizeof(req); 4905 4906 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 4907 if (errno != ENOMEM) 4908 return (errno); 4909 } 4910 4911 sz = req.size; 4912 if ((olh = calloc(1, sz)) == NULL) 4913 return (ENOMEM); 4914 4915 olh->size = sz; 4916 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 4917 free(olh); 4918 return (errno); 4919 } 4920 4921 *polh = olh; 4922 return (0); 4923 } 4924 4925 static int 4926 ifinfo_cmp(const void *a, const void *b) 4927 { 4928 ipfw_iface_info *ia, *ib; 4929 4930 ia = (ipfw_iface_info *)a; 4931 ib = (ipfw_iface_info *)b; 4932 4933 return (stringnum_cmp(ia->ifname, ib->ifname)); 4934 } 4935 4936 /* 4937 * Retrieves table list from kernel, 4938 * optionally sorts it and calls requested function for each table. 4939 * Returns 0 on success. 4940 */ 4941 static void 4942 ipfw_list_tifaces() 4943 { 4944 ipfw_obj_lheader *olh; 4945 ipfw_iface_info *info; 4946 int i, error; 4947 4948 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 4949 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 4950 4951 4952 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 4953 4954 info = (ipfw_iface_info *)(olh + 1); 4955 for (i = 0; i < olh->count; i++) { 4956 if (info->flags & IPFW_IFFLAG_RESOLVED) 4957 printf("%s ifindex: %d refcount: %u changes: %u\n", 4958 info->ifname, info->ifindex, info->refcnt, 4959 info->gencnt); 4960 else 4961 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 4962 info->ifname, info->refcnt, info->gencnt); 4963 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 4964 } 4965 4966 free(olh); 4967 } 4968 4969 4970 4971 4972