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 <jail.h> 36 #include <netdb.h> 37 #include <pwd.h> 38 #include <stdio.h> 39 #include <stdarg.h> 40 #include <stdint.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <sysexits.h> 44 #include <time.h> /* ctime */ 45 #include <timeconv.h> /* _long_to_time */ 46 #include <unistd.h> 47 #include <fcntl.h> 48 #include <stddef.h> /* offsetof */ 49 50 #include <net/ethernet.h> 51 #include <net/if.h> /* only IFNAMSIZ */ 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> /* only n_short, n_long */ 54 #include <netinet/ip.h> 55 #include <netinet/ip_icmp.h> 56 #include <netinet/ip_fw.h> 57 #include <netinet/tcp.h> 58 #include <arpa/inet.h> 59 60 struct cmdline_opts g_co; /* global options */ 61 62 struct format_opts { 63 int bcwidth; 64 int pcwidth; 65 int show_counters; 66 int show_time; /* show timestamp */ 67 uint32_t set_mask; /* enabled sets mask */ 68 uint32_t flags; /* request flags */ 69 uint32_t first; /* first rule to request */ 70 uint32_t last; /* last rule to request */ 71 uint32_t dcnt; /* number of dynamic states */ 72 ipfw_obj_ctlv *tstate; /* table state data */ 73 }; 74 75 int resvd_set_number = RESVD_SET; 76 77 static int ipfw_socket = -1; 78 79 #define CHECK_LENGTH(v, len) do { \ 80 if ((v) < (len)) \ 81 errx(EX_DATAERR, "Rule too long"); \ 82 } while (0) 83 /* 84 * Check if we have enough space in cmd buffer. Note that since 85 * first 8? u32 words are reserved by reserved header, full cmd 86 * buffer can't be used, so we need to protect from buffer overrun 87 * only. At the beginning, cblen is less than actual buffer size by 88 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need 89 * for checking small instructions fitting in given range. 90 * We also (ab)use the fact that ipfw_insn is always the first field 91 * for any custom instruction. 92 */ 93 #define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) 94 95 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 96 if (!av[0]) \ 97 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 98 if (_substrcmp(*av, "tablearg") == 0) { \ 99 arg = IP_FW_TARG; \ 100 break; \ 101 } \ 102 \ 103 { \ 104 long _xval; \ 105 char *end; \ 106 \ 107 _xval = strtol(*av, &end, 10); \ 108 \ 109 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 110 errx(EX_DATAERR, "%s: invalid argument: %s", \ 111 match_value(s_x, tok), *av); \ 112 \ 113 if (errno == ERANGE || _xval < min || _xval > max) \ 114 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 115 match_value(s_x, tok), min, max, *av); \ 116 \ 117 if (_xval == IP_FW_TARG) \ 118 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 119 match_value(s_x, tok), *av); \ 120 arg = _xval; \ 121 } \ 122 } while (0) 123 124 static struct _s_x f_tcpflags[] = { 125 { "syn", TH_SYN }, 126 { "fin", TH_FIN }, 127 { "ack", TH_ACK }, 128 { "psh", TH_PUSH }, 129 { "rst", TH_RST }, 130 { "urg", TH_URG }, 131 { "tcp flag", 0 }, 132 { NULL, 0 } 133 }; 134 135 static struct _s_x f_tcpopts[] = { 136 { "mss", IP_FW_TCPOPT_MSS }, 137 { "maxseg", IP_FW_TCPOPT_MSS }, 138 { "window", IP_FW_TCPOPT_WINDOW }, 139 { "sack", IP_FW_TCPOPT_SACK }, 140 { "ts", IP_FW_TCPOPT_TS }, 141 { "timestamp", IP_FW_TCPOPT_TS }, 142 { "cc", IP_FW_TCPOPT_CC }, 143 { "tcp option", 0 }, 144 { NULL, 0 } 145 }; 146 147 /* 148 * IP options span the range 0 to 255 so we need to remap them 149 * (though in fact only the low 5 bits are significant). 150 */ 151 static struct _s_x f_ipopts[] = { 152 { "ssrr", IP_FW_IPOPT_SSRR}, 153 { "lsrr", IP_FW_IPOPT_LSRR}, 154 { "rr", IP_FW_IPOPT_RR}, 155 { "ts", IP_FW_IPOPT_TS}, 156 { "ip option", 0 }, 157 { NULL, 0 } 158 }; 159 160 static struct _s_x f_iptos[] = { 161 { "lowdelay", IPTOS_LOWDELAY}, 162 { "throughput", IPTOS_THROUGHPUT}, 163 { "reliability", IPTOS_RELIABILITY}, 164 { "mincost", IPTOS_MINCOST}, 165 { "congestion", IPTOS_ECN_CE}, 166 { "ecntransport", IPTOS_ECN_ECT0}, 167 { "ip tos option", 0}, 168 { NULL, 0 } 169 }; 170 171 static struct _s_x f_ipoff[] = { 172 { "rf", IP_RF >> 8 }, 173 { "df", IP_DF >> 8 }, 174 { "mf", IP_MF >> 8 }, 175 { "offset", 0x1 }, 176 { NULL, 0} 177 }; 178 179 struct _s_x f_ipdscp[] = { 180 { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ 181 { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ 182 { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ 183 { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ 184 { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ 185 { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ 186 { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ 187 { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ 188 { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ 189 { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ 190 { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ 191 { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ 192 { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 193 { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ 194 { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 195 { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ 196 { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ 197 { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ 198 { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ 199 { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ 200 { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ 201 { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ 202 { NULL, 0 } 203 }; 204 205 static struct _s_x limit_masks[] = { 206 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 207 {"src-addr", DYN_SRC_ADDR}, 208 {"src-port", DYN_SRC_PORT}, 209 {"dst-addr", DYN_DST_ADDR}, 210 {"dst-port", DYN_DST_PORT}, 211 {NULL, 0} 212 }; 213 214 /* 215 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 216 * This is only used in this code. 217 */ 218 #define IPPROTO_ETHERTYPE 0x1000 219 static struct _s_x ether_types[] = { 220 /* 221 * Note, we cannot use "-:&/" in the names because they are field 222 * separators in the type specifications. Also, we use s = NULL as 223 * end-delimiter, because a type of 0 can be legal. 224 */ 225 { "ip", 0x0800 }, 226 { "ipv4", 0x0800 }, 227 { "ipv6", 0x86dd }, 228 { "arp", 0x0806 }, 229 { "rarp", 0x8035 }, 230 { "vlan", 0x8100 }, 231 { "loop", 0x9000 }, 232 { "trail", 0x1000 }, 233 { "at", 0x809b }, 234 { "atalk", 0x809b }, 235 { "aarp", 0x80f3 }, 236 { "pppoe_disc", 0x8863 }, 237 { "pppoe_sess", 0x8864 }, 238 { "ipx_8022", 0x00E0 }, 239 { "ipx_8023", 0x0000 }, 240 { "ipx_ii", 0x8137 }, 241 { "ipx_snap", 0x8137 }, 242 { "ipx", 0x8137 }, 243 { "ns", 0x0600 }, 244 { NULL, 0 } 245 }; 246 247 static struct _s_x rule_eactions[] = { 248 { "nat64clat", TOK_NAT64CLAT }, 249 { "nat64lsn", TOK_NAT64LSN }, 250 { "nat64stl", TOK_NAT64STL }, 251 { "nptv6", TOK_NPTV6 }, 252 { "tcp-setmss", TOK_TCPSETMSS }, 253 { NULL, 0 } /* terminator */ 254 }; 255 256 static struct _s_x rule_actions[] = { 257 { "abort6", TOK_ABORT6 }, 258 { "abort", TOK_ABORT }, 259 { "accept", TOK_ACCEPT }, 260 { "pass", TOK_ACCEPT }, 261 { "allow", TOK_ACCEPT }, 262 { "permit", TOK_ACCEPT }, 263 { "count", TOK_COUNT }, 264 { "pipe", TOK_PIPE }, 265 { "queue", TOK_QUEUE }, 266 { "divert", TOK_DIVERT }, 267 { "tee", TOK_TEE }, 268 { "netgraph", TOK_NETGRAPH }, 269 { "ngtee", TOK_NGTEE }, 270 { "fwd", TOK_FORWARD }, 271 { "forward", TOK_FORWARD }, 272 { "skipto", TOK_SKIPTO }, 273 { "deny", TOK_DENY }, 274 { "drop", TOK_DENY }, 275 { "reject", TOK_REJECT }, 276 { "reset6", TOK_RESET6 }, 277 { "reset", TOK_RESET }, 278 { "unreach6", TOK_UNREACH6 }, 279 { "unreach", TOK_UNREACH }, 280 { "check-state", TOK_CHECKSTATE }, 281 { "//", TOK_COMMENT }, 282 { "nat", TOK_NAT }, 283 { "reass", TOK_REASS }, 284 { "setfib", TOK_SETFIB }, 285 { "setdscp", TOK_SETDSCP }, 286 { "call", TOK_CALL }, 287 { "return", TOK_RETURN }, 288 { "eaction", TOK_EACTION }, 289 { "tcp-setmss", TOK_TCPSETMSS }, 290 { NULL, 0 } /* terminator */ 291 }; 292 293 static struct _s_x rule_action_params[] = { 294 { "altq", TOK_ALTQ }, 295 { "log", TOK_LOG }, 296 { "tag", TOK_TAG }, 297 { "untag", TOK_UNTAG }, 298 { NULL, 0 } /* terminator */ 299 }; 300 301 /* 302 * The 'lookup' instruction accepts one of the following arguments. 303 * Arguments are passed as v[1] in O_DST_LOOKUP options. 304 */ 305 static struct _s_x lookup_keys[] = { 306 { "dst-ip", LOOKUP_DST_IP }, 307 { "src-ip", LOOKUP_SRC_IP }, 308 { "dst-port", LOOKUP_DST_PORT }, 309 { "src-port", LOOKUP_SRC_PORT }, 310 { "dst-mac", LOOKUP_DST_MAC }, 311 { "src-mac", LOOKUP_SRC_MAC }, 312 { "uid", LOOKUP_UID }, 313 { "jail", LOOKUP_JAIL }, 314 { "dscp", LOOKUP_DSCP }, 315 { NULL, 0 }, 316 }; 317 318 static struct _s_x rule_options[] = { 319 { "tagged", TOK_TAGGED }, 320 { "uid", TOK_UID }, 321 { "gid", TOK_GID }, 322 { "jail", TOK_JAIL }, 323 { "in", TOK_IN }, 324 { "limit", TOK_LIMIT }, 325 { "set-limit", TOK_SETLIMIT }, 326 { "keep-state", TOK_KEEPSTATE }, 327 { "record-state", TOK_RECORDSTATE }, 328 { "bridged", TOK_LAYER2 }, 329 { "layer2", TOK_LAYER2 }, 330 { "out", TOK_OUT }, 331 { "diverted", TOK_DIVERTED }, 332 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 333 { "diverted-output", TOK_DIVERTEDOUTPUT }, 334 { "xmit", TOK_XMIT }, 335 { "recv", TOK_RECV }, 336 { "via", TOK_VIA }, 337 { "fragment", TOK_FRAG }, 338 { "frag", TOK_FRAG }, 339 { "fib", TOK_FIB }, 340 { "ipoptions", TOK_IPOPTS }, 341 { "ipopts", TOK_IPOPTS }, 342 { "iplen", TOK_IPLEN }, 343 { "ipid", TOK_IPID }, 344 { "ipprecedence", TOK_IPPRECEDENCE }, 345 { "dscp", TOK_DSCP }, 346 { "iptos", TOK_IPTOS }, 347 { "ipttl", TOK_IPTTL }, 348 { "ipversion", TOK_IPVER }, 349 { "ipver", TOK_IPVER }, 350 { "estab", TOK_ESTAB }, 351 { "established", TOK_ESTAB }, 352 { "setup", TOK_SETUP }, 353 { "sockarg", TOK_SOCKARG }, 354 { "tcpdatalen", TOK_TCPDATALEN }, 355 { "tcpflags", TOK_TCPFLAGS }, 356 { "tcpflgs", TOK_TCPFLAGS }, 357 { "tcpmss", TOK_TCPMSS }, 358 { "tcpoptions", TOK_TCPOPTS }, 359 { "tcpopts", TOK_TCPOPTS }, 360 { "tcpseq", TOK_TCPSEQ }, 361 { "tcpack", TOK_TCPACK }, 362 { "tcpwin", TOK_TCPWIN }, 363 { "icmptype", TOK_ICMPTYPES }, 364 { "icmptypes", TOK_ICMPTYPES }, 365 { "dst-ip", TOK_DSTIP }, 366 { "src-ip", TOK_SRCIP }, 367 { "dst-port", TOK_DSTPORT }, 368 { "src-port", TOK_SRCPORT }, 369 { "dst-mac", TOK_DSTMAC }, 370 { "src-mac", TOK_SRCMAC }, 371 { "proto", TOK_PROTO }, 372 { "MAC", TOK_MAC }, 373 { "mac", TOK_MAC }, 374 { "mac-type", TOK_MACTYPE }, 375 { "verrevpath", TOK_VERREVPATH }, 376 { "versrcreach", TOK_VERSRCREACH }, 377 { "antispoof", TOK_ANTISPOOF }, 378 { "ipsec", TOK_IPSEC }, 379 { "icmp6type", TOK_ICMP6TYPES }, 380 { "icmp6types", TOK_ICMP6TYPES }, 381 { "ext6hdr", TOK_EXT6HDR }, 382 { "flow-id", TOK_FLOWID }, 383 { "ipv6", TOK_IPV6 }, 384 { "ip6", TOK_IPV6 }, 385 { "ipv4", TOK_IPV4 }, 386 { "ip4", TOK_IPV4 }, 387 { "dst-ipv6", TOK_DSTIP6 }, 388 { "dst-ip6", TOK_DSTIP6 }, 389 { "src-ipv6", TOK_SRCIP6 }, 390 { "src-ip6", TOK_SRCIP6 }, 391 { "lookup", TOK_LOOKUP }, 392 { "flow", TOK_FLOW }, 393 { "defer-action", TOK_SKIPACTION }, 394 { "defer-immediate-action", TOK_SKIPACTION }, 395 { "//", TOK_COMMENT }, 396 397 { "not", TOK_NOT }, /* pseudo option */ 398 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 399 { "or", TOK_OR }, /* pseudo option */ 400 { "|", /* escape */ TOK_OR }, /* pseudo option */ 401 { "{", TOK_STARTBRACE }, /* pseudo option */ 402 { "(", TOK_STARTBRACE }, /* pseudo option */ 403 { "}", TOK_ENDBRACE }, /* pseudo option */ 404 { ")", TOK_ENDBRACE }, /* pseudo option */ 405 { NULL, 0 } /* terminator */ 406 }; 407 408 void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); 409 static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 410 ipfw_cfg_lheader **pcfg, size_t *psize); 411 static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 412 ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); 413 static void ipfw_list_tifaces(void); 414 415 struct tidx; 416 static uint16_t pack_object(struct tidx *tstate, const char *name, int otype); 417 static uint16_t pack_table(struct tidx *tstate, const char *name); 418 419 static char *table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx); 420 static void object_sort_ctlv(ipfw_obj_ctlv *ctlv); 421 static char *object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, 422 uint16_t type); 423 424 int 425 is_ipfw(void) 426 { 427 return (g_co.prog == cmdline_prog_ipfw); 428 } 429 430 /* 431 * Simple string buffer API. 432 * Used to simplify buffer passing between function and for 433 * transparent overrun handling. 434 */ 435 436 /* 437 * Allocates new buffer of given size @sz. 438 * 439 * Returns 0 on success. 440 */ 441 int 442 bp_alloc(struct buf_pr *b, size_t size) 443 { 444 memset(b, 0, sizeof(struct buf_pr)); 445 446 if ((b->buf = calloc(1, size)) == NULL) 447 return (ENOMEM); 448 449 b->ptr = b->buf; 450 b->size = size; 451 b->avail = b->size; 452 453 return (0); 454 } 455 456 void 457 bp_free(struct buf_pr *b) 458 { 459 460 free(b->buf); 461 } 462 463 /* 464 * Flushes buffer so new writer start from beginning. 465 */ 466 void 467 bp_flush(struct buf_pr *b) 468 { 469 470 b->ptr = b->buf; 471 b->avail = b->size; 472 b->buf[0] = '\0'; 473 } 474 475 /* 476 * Print message specified by @format and args. 477 * Automatically manage buffer space and transparently handle 478 * buffer overruns. 479 * 480 * Returns number of bytes that should have been printed. 481 */ 482 int 483 bprintf(struct buf_pr *b, const char *format, ...) 484 { 485 va_list args; 486 int i; 487 488 va_start(args, format); 489 490 i = vsnprintf(b->ptr, b->avail, format, args); 491 va_end(args); 492 493 if (i < 0 || (size_t)i > b->avail) { 494 /* Overflow or print error */ 495 b->avail = 0; 496 } else { 497 b->ptr += i; 498 b->avail -= i; 499 } 500 501 b->needed += i; 502 503 return (i); 504 } 505 506 /* 507 * Special values printer for tablearg-aware opcodes. 508 */ 509 void 510 bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) 511 { 512 513 if (str != NULL) 514 bprintf(bp, "%s", str); 515 if (arg == IP_FW_TARG) 516 bprintf(bp, "tablearg"); 517 else 518 bprintf(bp, "%u", arg); 519 } 520 521 /* 522 * Helper routine to print a possibly unaligned uint64_t on 523 * various platform. If width > 0, print the value with 524 * the desired width, followed by a space; 525 * otherwise, return the required width. 526 */ 527 int 528 pr_u64(struct buf_pr *b, void *pd, int width) 529 { 530 #ifdef TCC 531 #define U64_FMT "I64" 532 #else 533 #define U64_FMT "llu" 534 #endif 535 uint64_t u; 536 unsigned long long d; 537 538 bcopy (pd, &u, sizeof(u)); 539 d = u; 540 return (width > 0) ? 541 bprintf(b, "%*" U64_FMT " ", width, d) : 542 snprintf(NULL, 0, "%" U64_FMT, d) ; 543 #undef U64_FMT 544 } 545 546 547 void * 548 safe_calloc(size_t number, size_t size) 549 { 550 void *ret = calloc(number, size); 551 552 if (ret == NULL) 553 err(EX_OSERR, "calloc"); 554 return ret; 555 } 556 557 void * 558 safe_realloc(void *ptr, size_t size) 559 { 560 void *ret = realloc(ptr, size); 561 562 if (ret == NULL) 563 err(EX_OSERR, "realloc"); 564 return ret; 565 } 566 567 /* 568 * Compare things like interface or table names. 569 */ 570 int 571 stringnum_cmp(const char *a, const char *b) 572 { 573 int la, lb; 574 575 la = strlen(a); 576 lb = strlen(b); 577 578 if (la > lb) 579 return (1); 580 else if (la < lb) 581 return (-01); 582 583 return (strcmp(a, b)); 584 } 585 586 587 /* 588 * conditionally runs the command. 589 * Selected options or negative -> getsockopt 590 */ 591 int 592 do_cmd(int optname, void *optval, uintptr_t optlen) 593 { 594 int i; 595 596 if (g_co.test_only) 597 return 0; 598 599 if (ipfw_socket == -1) 600 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 601 if (ipfw_socket < 0) 602 err(EX_UNAVAILABLE, "socket"); 603 604 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 605 optname == IP_FW_ADD || optname == IP_FW3 || 606 optname == IP_FW_NAT_GET_CONFIG || 607 optname < 0 || 608 optname == IP_FW_NAT_GET_LOG) { 609 if (optname < 0) 610 optname = -optname; 611 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 612 (socklen_t *)optlen); 613 } else { 614 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 615 } 616 return i; 617 } 618 619 /* 620 * do_set3 - pass ipfw control cmd to kernel 621 * @optname: option name 622 * @optval: pointer to option data 623 * @optlen: option length 624 * 625 * Assumes op3 header is already embedded. 626 * Calls setsockopt() with IP_FW3 as kernel-visible opcode. 627 * Returns 0 on success or errno otherwise. 628 */ 629 int 630 do_set3(int optname, ip_fw3_opheader *op3, size_t optlen) 631 { 632 633 if (g_co.test_only) 634 return (0); 635 636 if (ipfw_socket == -1) 637 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 638 if (ipfw_socket < 0) 639 err(EX_UNAVAILABLE, "socket"); 640 641 op3->opcode = optname; 642 643 return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen)); 644 } 645 646 /* 647 * do_get3 - pass ipfw control cmd to kernel 648 * @optname: option name 649 * @optval: pointer to option data 650 * @optlen: pointer to option length 651 * 652 * Assumes op3 header is already embedded. 653 * Calls getsockopt() with IP_FW3 as kernel-visible opcode. 654 * Returns 0 on success or errno otherwise. 655 */ 656 int 657 do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) 658 { 659 int error; 660 socklen_t len; 661 662 if (g_co.test_only) 663 return (0); 664 665 if (ipfw_socket == -1) 666 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 667 if (ipfw_socket < 0) 668 err(EX_UNAVAILABLE, "socket"); 669 670 op3->opcode = optname; 671 672 len = *optlen; 673 error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, &len); 674 *optlen = len; 675 676 return (error); 677 } 678 679 /** 680 * match_token takes a table and a string, returns the value associated 681 * with the string (-1 in case of failure). 682 */ 683 int 684 match_token(struct _s_x *table, const char *string) 685 { 686 struct _s_x *pt; 687 uint i = strlen(string); 688 689 for (pt = table ; i && pt->s != NULL ; pt++) 690 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 691 return pt->x; 692 return (-1); 693 } 694 695 /** 696 * match_token_relaxed takes a table and a string, returns the value associated 697 * with the string for the best match. 698 * 699 * Returns: 700 * value from @table for matched records 701 * -1 for non-matched records 702 * -2 if more than one records match @string. 703 */ 704 int 705 match_token_relaxed(struct _s_x *table, const char *string) 706 { 707 struct _s_x *pt, *m; 708 int i, c; 709 710 i = strlen(string); 711 c = 0; 712 713 for (pt = table ; i != 0 && pt->s != NULL ; pt++) { 714 if (strncmp(pt->s, string, i) != 0) 715 continue; 716 m = pt; 717 c++; 718 } 719 720 if (c == 1) 721 return (m->x); 722 723 return (c > 0 ? -2: -1); 724 } 725 726 int 727 get_token(struct _s_x *table, const char *string, const char *errbase) 728 { 729 int tcmd; 730 731 if ((tcmd = match_token_relaxed(table, string)) < 0) 732 errx(EX_USAGE, "%s %s %s", 733 (tcmd == 0) ? "invalid" : "ambiguous", errbase, string); 734 735 return (tcmd); 736 } 737 738 /** 739 * match_value takes a table and a value, returns the string associated 740 * with the value (NULL in case of failure). 741 */ 742 char const * 743 match_value(struct _s_x *p, int value) 744 { 745 for (; p->s != NULL; p++) 746 if (p->x == value) 747 return p->s; 748 return NULL; 749 } 750 751 size_t 752 concat_tokens(char *buf, size_t bufsize, struct _s_x *table, 753 const char *delimiter) 754 { 755 struct _s_x *pt; 756 int l; 757 size_t sz; 758 759 for (sz = 0, pt = table ; pt->s != NULL; pt++) { 760 l = snprintf(buf + sz, bufsize - sz, "%s%s", 761 (sz == 0) ? "" : delimiter, pt->s); 762 sz += l; 763 bufsize += l; 764 if (sz > bufsize) 765 return (bufsize); 766 } 767 768 return (sz); 769 } 770 771 /* 772 * helper function to process a set of flags and set bits in the 773 * appropriate masks. 774 */ 775 int 776 fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set, 777 uint32_t *clear) 778 { 779 char *q; /* points to the separator */ 780 int val; 781 uint32_t *which; /* mask we are working on */ 782 783 while (p && *p) { 784 if (*p == '!') { 785 p++; 786 which = clear; 787 } else 788 which = set; 789 q = strchr(p, ','); 790 if (q) 791 *q++ = '\0'; 792 val = match_token(flags, p); 793 if (val <= 0) { 794 if (e != NULL) 795 *e = p; 796 return (-1); 797 } 798 *which |= (uint32_t)val; 799 p = q; 800 } 801 return (0); 802 } 803 804 void 805 print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set) 806 { 807 char const *comma = ""; 808 int i, l; 809 810 for (i = 0; list[i].x != 0; i++) { 811 if ((set & list[i].x) == 0) 812 continue; 813 814 set &= ~list[i].x; 815 l = snprintf(buf, sz, "%s%s", comma, list[i].s); 816 if (l < 0 || (size_t)l >= sz) 817 return; 818 comma = ","; 819 buf += l; 820 sz -=l; 821 } 822 } 823 824 /* 825 * _substrcmp takes two strings and returns 1 if they do not match, 826 * and 0 if they match exactly or the first string is a sub-string 827 * of the second. A warning is printed to stderr in the case that the 828 * first string is a sub-string of the second. 829 * 830 * This function will be removed in the future through the usual 831 * deprecation process. 832 */ 833 int 834 _substrcmp(const char *str1, const char* str2) 835 { 836 837 if (strncmp(str1, str2, strlen(str1)) != 0) 838 return 1; 839 840 if (strlen(str1) != strlen(str2)) 841 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 842 str1, str2); 843 return 0; 844 } 845 846 /* 847 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 848 * and 0 if they match exactly or the second string is a sub-string 849 * of the first. A warning is printed to stderr in the case that the 850 * first string does not match the third. 851 * 852 * This function exists to warn about the bizarre construction 853 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 854 * for "bytes". The problem is that in addition to accepting "by", 855 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 856 * other string beginning with "by". 857 * 858 * This function will be removed in the future through the usual 859 * deprecation process. 860 */ 861 int 862 _substrcmp2(const char *str1, const char* str2, const char* str3) 863 { 864 865 if (strncmp(str1, str2, strlen(str2)) != 0) 866 return 1; 867 868 if (strcmp(str1, str3) != 0) 869 warnx("DEPRECATED: '%s' matched '%s'", 870 str1, str3); 871 return 0; 872 } 873 874 /* 875 * prints one port, symbolic or numeric 876 */ 877 static void 878 print_port(struct buf_pr *bp, int proto, uint16_t port) 879 { 880 881 if (proto == IPPROTO_ETHERTYPE) { 882 char const *s; 883 884 if (g_co.do_resolv && (s = match_value(ether_types, port)) ) 885 bprintf(bp, "%s", s); 886 else 887 bprintf(bp, "0x%04x", port); 888 } else { 889 struct servent *se = NULL; 890 if (g_co.do_resolv) { 891 struct protoent *pe = getprotobynumber(proto); 892 893 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 894 } 895 if (se) 896 bprintf(bp, "%s", se->s_name); 897 else 898 bprintf(bp, "%d", port); 899 } 900 } 901 902 static struct _s_x _port_name[] = { 903 {"dst-port", O_IP_DSTPORT}, 904 {"src-port", O_IP_SRCPORT}, 905 {"ipid", O_IPID}, 906 {"iplen", O_IPLEN}, 907 {"ipttl", O_IPTTL}, 908 {"mac-type", O_MAC_TYPE}, 909 {"tcpdatalen", O_TCPDATALEN}, 910 {"tcpmss", O_TCPMSS}, 911 {"tcpwin", O_TCPWIN}, 912 {"tagged", O_TAGGED}, 913 {NULL, 0} 914 }; 915 916 /* 917 * Print the values in a list 16-bit items of the types above. 918 * XXX todo: add support for mask. 919 */ 920 static void 921 print_newports(struct buf_pr *bp, const ipfw_insn_u16 *cmd, int proto, int opcode) 922 { 923 const uint16_t *p = cmd->ports; 924 int i; 925 char const *sep; 926 927 if (opcode != 0) { 928 sep = match_value(_port_name, opcode); 929 if (sep == NULL) 930 sep = "???"; 931 bprintf(bp, " %s", sep); 932 } 933 sep = " "; 934 for (i = F_LEN((const ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 935 bprintf(bp, "%s", sep); 936 print_port(bp, proto, p[0]); 937 if (p[0] != p[1]) { 938 bprintf(bp, "-"); 939 print_port(bp, proto, p[1]); 940 } 941 sep = ","; 942 } 943 } 944 945 /* 946 * Like strtol, but also translates service names into port numbers 947 * for some protocols. 948 * In particular: 949 * proto == -1 disables the protocol check; 950 * proto == IPPROTO_ETHERTYPE looks up an internal table 951 * proto == <some value in /etc/protocols> matches the values there. 952 * Returns *end == s in case the parameter is not found. 953 */ 954 static int 955 strtoport(char *s, char **end, int base, int proto) 956 { 957 char *p, *buf; 958 char *s1; 959 int i; 960 961 *end = s; /* default - not found */ 962 if (*s == '\0') 963 return 0; /* not found */ 964 965 if (isdigit(*s)) 966 return strtol(s, end, base); 967 968 /* 969 * find separator. '\\' escapes the next char. 970 */ 971 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\' || 972 *s1 == '_' || *s1 == '.') ; s1++) 973 if (*s1 == '\\' && s1[1] != '\0') 974 s1++; 975 976 buf = safe_calloc(s1 - s + 1, 1); 977 978 /* 979 * copy into a buffer skipping backslashes 980 */ 981 for (p = s, i = 0; p != s1 ; p++) 982 if (*p != '\\') 983 buf[i++] = *p; 984 buf[i++] = '\0'; 985 986 if (proto == IPPROTO_ETHERTYPE) { 987 i = match_token(ether_types, buf); 988 free(buf); 989 if (i != -1) { /* found */ 990 *end = s1; 991 return i; 992 } 993 } else { 994 struct protoent *pe = NULL; 995 struct servent *se; 996 997 if (proto != 0) 998 pe = getprotobynumber(proto); 999 setservent(1); 1000 se = getservbyname(buf, pe ? pe->p_name : NULL); 1001 free(buf); 1002 if (se != NULL) { 1003 *end = s1; 1004 return ntohs(se->s_port); 1005 } 1006 } 1007 return 0; /* not found */ 1008 } 1009 1010 /* 1011 * Fill the body of the command with the list of port ranges. 1012 */ 1013 static int 1014 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 1015 { 1016 uint16_t a, b, *p = cmd->ports; 1017 int i = 0; 1018 char *s = av; 1019 1020 while (*s) { 1021 a = strtoport(av, &s, 0, proto); 1022 if (s == av) /* empty or invalid argument */ 1023 return (0); 1024 1025 CHECK_LENGTH(cblen, i + 2); 1026 1027 switch (*s) { 1028 case '-': /* a range */ 1029 av = s + 1; 1030 b = strtoport(av, &s, 0, proto); 1031 /* Reject expressions like '1-abc' or '1-2-3'. */ 1032 if (s == av || (*s != ',' && *s != '\0')) 1033 return (0); 1034 p[0] = a; 1035 p[1] = b; 1036 break; 1037 case ',': /* comma separated list */ 1038 case '\0': 1039 p[0] = p[1] = a; 1040 break; 1041 default: 1042 warnx("port list: invalid separator <%c> in <%s>", 1043 *s, av); 1044 return (0); 1045 } 1046 1047 i++; 1048 p += 2; 1049 av = s + 1; 1050 } 1051 if (i > 0) { 1052 if (i + 1 > F_LEN_MASK) 1053 errx(EX_DATAERR, "too many ports/ranges\n"); 1054 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 1055 } 1056 return (i); 1057 } 1058 1059 /* 1060 * Fill the body of the command with the list of DiffServ codepoints. 1061 */ 1062 static void 1063 fill_dscp(ipfw_insn *cmd, char *av, int cblen) 1064 { 1065 uint32_t *low, *high; 1066 char *s = av, *a; 1067 int code; 1068 1069 cmd->opcode = O_DSCP; 1070 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1071 1072 CHECK_CMDLEN; 1073 1074 low = (uint32_t *)(cmd + 1); 1075 high = low + 1; 1076 1077 *low = 0; 1078 *high = 0; 1079 1080 while (s != NULL) { 1081 a = strchr(s, ','); 1082 1083 if (a != NULL) 1084 *a++ = '\0'; 1085 1086 if (isalpha(*s)) { 1087 if ((code = match_token(f_ipdscp, s)) == -1) 1088 errx(EX_DATAERR, "Unknown DSCP code"); 1089 } else { 1090 code = strtoul(s, NULL, 10); 1091 if (code < 0 || code > 63) 1092 errx(EX_DATAERR, "Invalid DSCP value"); 1093 } 1094 1095 if (code >= 32) 1096 *high |= 1 << (code - 32); 1097 else 1098 *low |= 1 << code; 1099 1100 s = a; 1101 } 1102 } 1103 1104 static struct _s_x icmpcodes[] = { 1105 { "net", ICMP_UNREACH_NET }, 1106 { "host", ICMP_UNREACH_HOST }, 1107 { "protocol", ICMP_UNREACH_PROTOCOL }, 1108 { "port", ICMP_UNREACH_PORT }, 1109 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 1110 { "srcfail", ICMP_UNREACH_SRCFAIL }, 1111 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 1112 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 1113 { "isolated", ICMP_UNREACH_ISOLATED }, 1114 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 1115 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 1116 { "tosnet", ICMP_UNREACH_TOSNET }, 1117 { "toshost", ICMP_UNREACH_TOSHOST }, 1118 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 1119 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 1120 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 1121 { NULL, 0 } 1122 }; 1123 1124 static void 1125 fill_reject_code(u_short *codep, char *str) 1126 { 1127 int val; 1128 char *s; 1129 1130 val = strtoul(str, &s, 0); 1131 if (s == str || *s != '\0' || val >= 0x100) 1132 val = match_token(icmpcodes, str); 1133 if (val < 0) 1134 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 1135 *codep = val; 1136 return; 1137 } 1138 1139 static void 1140 print_reject_code(struct buf_pr *bp, uint16_t code) 1141 { 1142 char const *s; 1143 1144 if ((s = match_value(icmpcodes, code)) != NULL) 1145 bprintf(bp, "unreach %s", s); 1146 else 1147 bprintf(bp, "unreach %u", code); 1148 } 1149 1150 /* 1151 * Returns the number of bits set (from left) in a contiguous bitmask, 1152 * or -1 if the mask is not contiguous. 1153 * XXX this needs a proper fix. 1154 * This effectively works on masks in big-endian (network) format. 1155 * when compiled on little endian architectures. 1156 * 1157 * First bit is bit 7 of the first byte -- note, for MAC addresses, 1158 * the first bit on the wire is bit 0 of the first byte. 1159 * len is the max length in bits. 1160 */ 1161 int 1162 contigmask(const uint8_t *p, int len) 1163 { 1164 int i, n; 1165 1166 for (i=0; i<len ; i++) 1167 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 1168 break; 1169 for (n=i+1; n < len; n++) 1170 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 1171 return -1; /* mask not contiguous */ 1172 return i; 1173 } 1174 1175 /* 1176 * print flags set/clear in the two bitmasks passed as parameters. 1177 * There is a specialized check for f_tcpflags. 1178 */ 1179 static void 1180 print_flags(struct buf_pr *bp, char const *name, const ipfw_insn *cmd, 1181 struct _s_x *list) 1182 { 1183 char const *comma = ""; 1184 int i; 1185 uint8_t set = cmd->arg1 & 0xff; 1186 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 1187 1188 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 1189 bprintf(bp, " setup"); 1190 return; 1191 } 1192 1193 bprintf(bp, " %s ", name); 1194 for (i=0; list[i].x != 0; i++) { 1195 if (set & list[i].x) { 1196 set &= ~list[i].x; 1197 bprintf(bp, "%s%s", comma, list[i].s); 1198 comma = ","; 1199 } 1200 if (clear & list[i].x) { 1201 clear &= ~list[i].x; 1202 bprintf(bp, "%s!%s", comma, list[i].s); 1203 comma = ","; 1204 } 1205 } 1206 } 1207 1208 1209 /* 1210 * Print the ip address contained in a command. 1211 */ 1212 static void 1213 print_ip(struct buf_pr *bp, const struct format_opts *fo, 1214 const ipfw_insn_ip *cmd) 1215 { 1216 struct hostent *he = NULL; 1217 const struct in_addr *ia; 1218 const uint32_t *a = ((const ipfw_insn_u32 *)cmd)->d; 1219 uint32_t len = F_LEN((const ipfw_insn *)cmd); 1220 char *t; 1221 1222 bprintf(bp, " "); 1223 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 1224 const char *arg; 1225 1226 arg = match_value(lookup_keys, a[1]); 1227 t = table_search_ctlv(fo->tstate, 1228 ((const ipfw_insn *)cmd)->arg1); 1229 bprintf(bp, "lookup %s %s", arg, t); 1230 return; 1231 } 1232 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 1233 bprintf(bp, "me"); 1234 return; 1235 } 1236 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 1237 cmd->o.opcode == O_IP_DST_LOOKUP) { 1238 t = table_search_ctlv(fo->tstate, 1239 ((const ipfw_insn *)cmd)->arg1); 1240 bprintf(bp, "table(%s", t); 1241 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1242 bprintf(bp, ",%u", *a); 1243 bprintf(bp, ")"); 1244 return; 1245 } 1246 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 1247 const uint32_t *map = (const uint32_t *)&cmd->mask; 1248 struct in_addr addr; 1249 uint32_t x; 1250 int i, j; 1251 char comma = '{'; 1252 1253 x = cmd->o.arg1 - 1; 1254 x = htonl(~x); 1255 addr.s_addr = htonl(cmd->addr.s_addr); 1256 bprintf(bp, "%s/%d", inet_ntoa(addr), 1257 contigmask((uint8_t *)&x, 32)); 1258 x = cmd->addr.s_addr; 1259 x &= 0xff; /* base */ 1260 /* 1261 * Print bits and ranges. 1262 * Locate first bit set (i), then locate first bit unset (j). 1263 * If we have 3+ consecutive bits set, then print them as a 1264 * range, otherwise only print the initial bit and rescan. 1265 */ 1266 for (i=0; i < cmd->o.arg1; i++) 1267 if (map[i/32] & (1<<(i & 31))) { 1268 for (j=i+1; j < cmd->o.arg1; j++) 1269 if (!(map[ j/32] & (1<<(j & 31)))) 1270 break; 1271 bprintf(bp, "%c%d", comma, i+x); 1272 if (j>i+2) { /* range has at least 3 elements */ 1273 bprintf(bp, "-%d", j-1+x); 1274 i = j-1; 1275 } 1276 comma = ','; 1277 } 1278 bprintf(bp, "}"); 1279 return; 1280 } 1281 /* 1282 * len == 2 indicates a single IP, whereas lists of 1 or more 1283 * addr/mask pairs have len = (2n+1). We convert len to n so we 1284 * use that to count the number of entries. 1285 */ 1286 for (len = len / 2; len > 0; len--, a += 2) { 1287 int mb = /* mask length */ 1288 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 1289 32 : contigmask((const uint8_t *)&(a[1]), 32); 1290 if (mb == 32 && g_co.do_resolv) 1291 he = gethostbyaddr((const char *)&(a[0]), sizeof(in_addr_t), 1292 AF_INET); 1293 if (he != NULL) /* resolved to name */ 1294 bprintf(bp, "%s", he->h_name); 1295 else if (mb == 0) /* any */ 1296 bprintf(bp, "any"); 1297 else { /* numeric IP followed by some kind of mask */ 1298 ia = (const struct in_addr *)&a[0]; 1299 bprintf(bp, "%s", inet_ntoa(*ia)); 1300 if (mb < 0) { 1301 ia = (const struct in_addr *)&a[1]; 1302 bprintf(bp, ":%s", inet_ntoa(*ia)); 1303 } else if (mb < 32) 1304 bprintf(bp, "/%d", mb); 1305 } 1306 if (len > 1) 1307 bprintf(bp, ","); 1308 } 1309 } 1310 1311 /* 1312 * prints a MAC address/mask pair 1313 */ 1314 static void 1315 format_mac(struct buf_pr *bp, const uint8_t *addr, const uint8_t *mask) 1316 { 1317 int l = contigmask(mask, 48); 1318 1319 if (l == 0) 1320 bprintf(bp, " any"); 1321 else { 1322 bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", 1323 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1324 if (l == -1) 1325 bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", 1326 mask[0], mask[1], mask[2], 1327 mask[3], mask[4], mask[5]); 1328 else if (l < 48) 1329 bprintf(bp, "/%d", l); 1330 } 1331 } 1332 1333 static void 1334 print_mac(struct buf_pr *bp, const ipfw_insn_mac *mac) 1335 { 1336 1337 bprintf(bp, " MAC"); 1338 format_mac(bp, mac->addr, mac->mask); 1339 format_mac(bp, mac->addr + 6, mac->mask + 6); 1340 } 1341 1342 static void 1343 print_mac_lookup(struct buf_pr *bp, const struct format_opts *fo, 1344 const ipfw_insn *cmd) 1345 { 1346 uint32_t len = F_LEN(cmd); 1347 char *t; 1348 1349 bprintf(bp, " "); 1350 1351 t = table_search_ctlv(fo->tstate, cmd->arg1); 1352 bprintf(bp, "table(%s", t); 1353 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1354 bprintf(bp, ",%u", ((const ipfw_insn_u32 *)cmd)->d[0]); 1355 bprintf(bp, ")"); 1356 } 1357 1358 static void 1359 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1360 { 1361 uint8_t type; 1362 1363 cmd->d[0] = 0; 1364 while (*av) { 1365 if (*av == ',') 1366 av++; 1367 1368 type = strtoul(av, &av, 0); 1369 1370 if (*av != ',' && *av != '\0') 1371 errx(EX_DATAERR, "invalid ICMP type"); 1372 1373 if (type > 31) 1374 errx(EX_DATAERR, "ICMP type out of range"); 1375 1376 cmd->d[0] |= 1 << type; 1377 } 1378 cmd->o.opcode = O_ICMPTYPE; 1379 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1380 } 1381 1382 static void 1383 print_icmptypes(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1384 { 1385 int i; 1386 char sep= ' '; 1387 1388 bprintf(bp, " icmptypes"); 1389 for (i = 0; i < 32; i++) { 1390 if ( (cmd->d[0] & (1 << (i))) == 0) 1391 continue; 1392 bprintf(bp, "%c%d", sep, i); 1393 sep = ','; 1394 } 1395 } 1396 1397 static void 1398 print_dscp(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1399 { 1400 const uint32_t *v; 1401 const char *code; 1402 int i = 0; 1403 char sep= ' '; 1404 1405 bprintf(bp, " dscp"); 1406 v = cmd->d; 1407 while (i < 64) { 1408 if (*v & (1 << i)) { 1409 if ((code = match_value(f_ipdscp, i)) != NULL) 1410 bprintf(bp, "%c%s", sep, code); 1411 else 1412 bprintf(bp, "%c%d", sep, i); 1413 sep = ','; 1414 } 1415 1416 if ((++i % 32) == 0) 1417 v++; 1418 } 1419 } 1420 1421 #define insntod(cmd, type) ((const ipfw_insn_ ## type *)(cmd)) 1422 struct show_state { 1423 struct ip_fw_rule *rule; 1424 const ipfw_insn *eaction; 1425 uint8_t *printed; 1426 int flags; 1427 #define HAVE_PROTO 0x0001 1428 #define HAVE_SRCIP 0x0002 1429 #define HAVE_DSTIP 0x0004 1430 #define HAVE_PROBE_STATE 0x0008 1431 int proto; 1432 int or_block; 1433 }; 1434 1435 static int 1436 init_show_state(struct show_state *state, struct ip_fw_rule *rule) 1437 { 1438 1439 state->printed = calloc(rule->cmd_len, sizeof(uint8_t)); 1440 if (state->printed == NULL) 1441 return (ENOMEM); 1442 state->rule = rule; 1443 state->eaction = NULL; 1444 state->flags = 0; 1445 state->proto = 0; 1446 state->or_block = 0; 1447 return (0); 1448 } 1449 1450 static void 1451 free_show_state(struct show_state *state) 1452 { 1453 1454 free(state->printed); 1455 } 1456 1457 static uint8_t 1458 is_printed_opcode(struct show_state *state, const ipfw_insn *cmd) 1459 { 1460 1461 return (state->printed[cmd - state->rule->cmd]); 1462 } 1463 1464 static void 1465 mark_printed(struct show_state *state, const ipfw_insn *cmd) 1466 { 1467 1468 state->printed[cmd - state->rule->cmd] = 1; 1469 } 1470 1471 static void 1472 print_limit_mask(struct buf_pr *bp, const ipfw_insn_limit *limit) 1473 { 1474 struct _s_x *p = limit_masks; 1475 char const *comma = " "; 1476 uint8_t x; 1477 1478 for (x = limit->limit_mask; p->x != 0; p++) { 1479 if ((x & p->x) == p->x) { 1480 x &= ~p->x; 1481 bprintf(bp, "%s%s", comma, p->s); 1482 comma = ","; 1483 } 1484 } 1485 bprint_uint_arg(bp, " ", limit->conn_limit); 1486 } 1487 1488 static int 1489 print_instruction(struct buf_pr *bp, const struct format_opts *fo, 1490 struct show_state *state, const ipfw_insn *cmd) 1491 { 1492 struct protoent *pe; 1493 struct passwd *pwd; 1494 struct group *grp; 1495 const char *s; 1496 double d; 1497 1498 if (is_printed_opcode(state, cmd)) 1499 return (0); 1500 if ((cmd->len & F_OR) != 0 && state->or_block == 0) 1501 bprintf(bp, " {"); 1502 if (cmd->opcode != O_IN && (cmd->len & F_NOT) != 0) 1503 bprintf(bp, " not"); 1504 1505 switch (cmd->opcode) { 1506 case O_PROB: 1507 d = 1.0 * insntod(cmd, u32)->d[0] / 0x7fffffff; 1508 bprintf(bp, "prob %f ", d); 1509 break; 1510 case O_PROBE_STATE: /* no need to print anything here */ 1511 state->flags |= HAVE_PROBE_STATE; 1512 break; 1513 case O_IP_SRC: 1514 case O_IP_SRC_LOOKUP: 1515 case O_IP_SRC_MASK: 1516 case O_IP_SRC_ME: 1517 case O_IP_SRC_SET: 1518 if (state->flags & HAVE_SRCIP) 1519 bprintf(bp, " src-ip"); 1520 print_ip(bp, fo, insntod(cmd, ip)); 1521 break; 1522 case O_IP_DST: 1523 case O_IP_DST_LOOKUP: 1524 case O_IP_DST_MASK: 1525 case O_IP_DST_ME: 1526 case O_IP_DST_SET: 1527 if (state->flags & HAVE_DSTIP) 1528 bprintf(bp, " dst-ip"); 1529 print_ip(bp, fo, insntod(cmd, ip)); 1530 break; 1531 case O_IP6_SRC: 1532 case O_IP6_SRC_MASK: 1533 case O_IP6_SRC_ME: 1534 if (state->flags & HAVE_SRCIP) 1535 bprintf(bp, " src-ip6"); 1536 print_ip6(bp, insntod(cmd, ip6)); 1537 break; 1538 case O_IP6_DST: 1539 case O_IP6_DST_MASK: 1540 case O_IP6_DST_ME: 1541 if (state->flags & HAVE_DSTIP) 1542 bprintf(bp, " dst-ip6"); 1543 print_ip6(bp, insntod(cmd, ip6)); 1544 break; 1545 case O_MAC_SRC_LOOKUP: 1546 bprintf(bp, " src-mac"); 1547 print_mac_lookup(bp, fo, cmd); 1548 break; 1549 case O_MAC_DST_LOOKUP: 1550 bprintf(bp, " dst-mac"); 1551 print_mac_lookup(bp, fo, cmd); 1552 break; 1553 case O_FLOW6ID: 1554 print_flow6id(bp, insntod(cmd, u32)); 1555 break; 1556 case O_IP_DSTPORT: 1557 case O_IP_SRCPORT: 1558 print_newports(bp, insntod(cmd, u16), state->proto, 1559 (state->flags & (HAVE_SRCIP | HAVE_DSTIP)) == 1560 (HAVE_SRCIP | HAVE_DSTIP) ? cmd->opcode: 0); 1561 break; 1562 case O_PROTO: 1563 pe = getprotobynumber(cmd->arg1); 1564 if (state->flags & HAVE_PROTO) 1565 bprintf(bp, " proto"); 1566 if (pe != NULL) 1567 bprintf(bp, " %s", pe->p_name); 1568 else 1569 bprintf(bp, " %u", cmd->arg1); 1570 state->proto = cmd->arg1; 1571 break; 1572 case O_MACADDR2: 1573 print_mac(bp, insntod(cmd, mac)); 1574 break; 1575 case O_MAC_TYPE: 1576 print_newports(bp, insntod(cmd, u16), 1577 IPPROTO_ETHERTYPE, cmd->opcode); 1578 break; 1579 case O_FRAG: 1580 print_flags(bp, "frag", cmd, f_ipoff); 1581 break; 1582 case O_FIB: 1583 bprintf(bp, " fib %u", cmd->arg1); 1584 break; 1585 case O_SOCKARG: 1586 bprintf(bp, " sockarg"); 1587 break; 1588 case O_IN: 1589 bprintf(bp, cmd->len & F_NOT ? " out" : " in"); 1590 break; 1591 case O_DIVERTED: 1592 switch (cmd->arg1) { 1593 case 3: 1594 bprintf(bp, " diverted"); 1595 break; 1596 case 2: 1597 bprintf(bp, " diverted-output"); 1598 break; 1599 case 1: 1600 bprintf(bp, " diverted-loopback"); 1601 break; 1602 default: 1603 bprintf(bp, " diverted-?<%u>", cmd->arg1); 1604 break; 1605 } 1606 break; 1607 case O_LAYER2: 1608 bprintf(bp, " layer2"); 1609 break; 1610 case O_XMIT: 1611 case O_RECV: 1612 case O_VIA: 1613 if (cmd->opcode == O_XMIT) 1614 s = "xmit"; 1615 else if (cmd->opcode == O_RECV) 1616 s = "recv"; 1617 else /* if (cmd->opcode == O_VIA) */ 1618 s = "via"; 1619 switch (insntod(cmd, if)->name[0]) { 1620 case '\0': 1621 bprintf(bp, " %s %s", s, 1622 inet_ntoa(insntod(cmd, if)->p.ip)); 1623 break; 1624 case '\1': 1625 bprintf(bp, " %s table(%s)", s, 1626 table_search_ctlv(fo->tstate, 1627 insntod(cmd, if)->p.kidx)); 1628 break; 1629 default: 1630 bprintf(bp, " %s %s", s, 1631 insntod(cmd, if)->name); 1632 } 1633 break; 1634 case O_IP_FLOW_LOOKUP: 1635 s = table_search_ctlv(fo->tstate, cmd->arg1); 1636 bprintf(bp, " flow table(%s", s); 1637 if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) 1638 bprintf(bp, ",%u", insntod(cmd, u32)->d[0]); 1639 bprintf(bp, ")"); 1640 break; 1641 case O_IPID: 1642 case O_IPTTL: 1643 case O_IPLEN: 1644 case O_TCPDATALEN: 1645 case O_TCPMSS: 1646 case O_TCPWIN: 1647 if (F_LEN(cmd) == 1) { 1648 switch (cmd->opcode) { 1649 case O_IPID: 1650 s = "ipid"; 1651 break; 1652 case O_IPTTL: 1653 s = "ipttl"; 1654 break; 1655 case O_IPLEN: 1656 s = "iplen"; 1657 break; 1658 case O_TCPDATALEN: 1659 s = "tcpdatalen"; 1660 break; 1661 case O_TCPMSS: 1662 s = "tcpmss"; 1663 break; 1664 case O_TCPWIN: 1665 s = "tcpwin"; 1666 break; 1667 default: 1668 s = "<unknown>"; 1669 break; 1670 } 1671 bprintf(bp, " %s %u", s, cmd->arg1); 1672 } else 1673 print_newports(bp, insntod(cmd, u16), 0, 1674 cmd->opcode); 1675 break; 1676 case O_IPVER: 1677 bprintf(bp, " ipver %u", cmd->arg1); 1678 break; 1679 case O_IPPRECEDENCE: 1680 bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); 1681 break; 1682 case O_DSCP: 1683 print_dscp(bp, insntod(cmd, u32)); 1684 break; 1685 case O_IPOPT: 1686 print_flags(bp, "ipoptions", cmd, f_ipopts); 1687 break; 1688 case O_IPTOS: 1689 print_flags(bp, "iptos", cmd, f_iptos); 1690 break; 1691 case O_ICMPTYPE: 1692 print_icmptypes(bp, insntod(cmd, u32)); 1693 break; 1694 case O_ESTAB: 1695 bprintf(bp, " established"); 1696 break; 1697 case O_TCPFLAGS: 1698 print_flags(bp, "tcpflags", cmd, f_tcpflags); 1699 break; 1700 case O_TCPOPTS: 1701 print_flags(bp, "tcpoptions", cmd, f_tcpopts); 1702 break; 1703 case O_TCPACK: 1704 bprintf(bp, " tcpack %d", 1705 ntohl(insntod(cmd, u32)->d[0])); 1706 break; 1707 case O_TCPSEQ: 1708 bprintf(bp, " tcpseq %d", 1709 ntohl(insntod(cmd, u32)->d[0])); 1710 break; 1711 case O_UID: 1712 pwd = getpwuid(insntod(cmd, u32)->d[0]); 1713 if (pwd != NULL) 1714 bprintf(bp, " uid %s", pwd->pw_name); 1715 else 1716 bprintf(bp, " uid %u", 1717 insntod(cmd, u32)->d[0]); 1718 break; 1719 case O_GID: 1720 grp = getgrgid(insntod(cmd, u32)->d[0]); 1721 if (grp != NULL) 1722 bprintf(bp, " gid %s", grp->gr_name); 1723 else 1724 bprintf(bp, " gid %u", 1725 insntod(cmd, u32)->d[0]); 1726 break; 1727 case O_JAIL: 1728 bprintf(bp, " jail %d", insntod(cmd, u32)->d[0]); 1729 break; 1730 case O_VERREVPATH: 1731 bprintf(bp, " verrevpath"); 1732 break; 1733 case O_VERSRCREACH: 1734 bprintf(bp, " versrcreach"); 1735 break; 1736 case O_ANTISPOOF: 1737 bprintf(bp, " antispoof"); 1738 break; 1739 case O_IPSEC: 1740 bprintf(bp, " ipsec"); 1741 break; 1742 case O_NOP: 1743 bprintf(bp, " // %s", (const char *)(cmd + 1)); 1744 break; 1745 case O_KEEP_STATE: 1746 if (state->flags & HAVE_PROBE_STATE) 1747 bprintf(bp, " keep-state"); 1748 else 1749 bprintf(bp, " record-state"); 1750 bprintf(bp, " :%s", 1751 object_search_ctlv(fo->tstate, cmd->arg1, 1752 IPFW_TLV_STATE_NAME)); 1753 break; 1754 case O_LIMIT: 1755 if (state->flags & HAVE_PROBE_STATE) 1756 bprintf(bp, " limit"); 1757 else 1758 bprintf(bp, " set-limit"); 1759 print_limit_mask(bp, insntod(cmd, limit)); 1760 bprintf(bp, " :%s", 1761 object_search_ctlv(fo->tstate, cmd->arg1, 1762 IPFW_TLV_STATE_NAME)); 1763 break; 1764 case O_IP6: 1765 if (state->flags & HAVE_PROTO) 1766 bprintf(bp, " proto"); 1767 bprintf(bp, " ip6"); 1768 break; 1769 case O_IP4: 1770 if (state->flags & HAVE_PROTO) 1771 bprintf(bp, " proto"); 1772 bprintf(bp, " ip4"); 1773 break; 1774 case O_ICMP6TYPE: 1775 print_icmp6types(bp, insntod(cmd, u32)); 1776 break; 1777 case O_EXT_HDR: 1778 print_ext6hdr(bp, cmd); 1779 break; 1780 case O_TAGGED: 1781 if (F_LEN(cmd) == 1) 1782 bprint_uint_arg(bp, " tagged ", cmd->arg1); 1783 else 1784 print_newports(bp, insntod(cmd, u16), 1785 0, O_TAGGED); 1786 break; 1787 case O_SKIP_ACTION: 1788 bprintf(bp, " defer-immediate-action"); 1789 break; 1790 default: 1791 bprintf(bp, " [opcode %d len %d]", cmd->opcode, 1792 cmd->len); 1793 } 1794 if (cmd->len & F_OR) { 1795 bprintf(bp, " or"); 1796 state->or_block = 1; 1797 } else if (state->or_block != 0) { 1798 bprintf(bp, " }"); 1799 state->or_block = 0; 1800 } 1801 mark_printed(state, cmd); 1802 1803 return (1); 1804 } 1805 1806 static ipfw_insn * 1807 print_opcode(struct buf_pr *bp, struct format_opts *fo, 1808 struct show_state *state, int opcode) 1809 { 1810 ipfw_insn *cmd; 1811 int l; 1812 1813 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 1814 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1815 /* We use zero opcode to print the rest of options */ 1816 if (opcode >= 0 && cmd->opcode != opcode) 1817 continue; 1818 /* 1819 * Skip O_NOP, when we printing the rest 1820 * of options, it will be handled separately. 1821 */ 1822 if (cmd->opcode == O_NOP && opcode != O_NOP) 1823 continue; 1824 if (!print_instruction(bp, fo, state, cmd)) 1825 continue; 1826 return (cmd); 1827 } 1828 return (NULL); 1829 } 1830 1831 static void 1832 print_fwd(struct buf_pr *bp, const ipfw_insn *cmd) 1833 { 1834 char buf[INET6_ADDRSTRLEN + IF_NAMESIZE + 2]; 1835 const ipfw_insn_sa6 *sa6; 1836 const ipfw_insn_sa *sa; 1837 uint16_t port; 1838 1839 if (cmd->opcode == O_FORWARD_IP) { 1840 sa = insntod(cmd, sa); 1841 port = sa->sa.sin_port; 1842 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 1843 bprintf(bp, "fwd tablearg"); 1844 else 1845 bprintf(bp, "fwd %s", inet_ntoa(sa->sa.sin_addr)); 1846 } else { 1847 sa6 = insntod(cmd, sa6); 1848 port = sa6->sa.sin6_port; 1849 bprintf(bp, "fwd "); 1850 if (getnameinfo((const struct sockaddr *)&sa6->sa, 1851 sizeof(struct sockaddr_in6), buf, sizeof(buf), NULL, 0, 1852 NI_NUMERICHOST) == 0) 1853 bprintf(bp, "%s", buf); 1854 } 1855 if (port != 0) 1856 bprintf(bp, ",%u", port); 1857 } 1858 1859 static int 1860 print_action_instruction(struct buf_pr *bp, const struct format_opts *fo, 1861 struct show_state *state, const ipfw_insn *cmd) 1862 { 1863 const char *s; 1864 1865 if (is_printed_opcode(state, cmd)) 1866 return (0); 1867 switch (cmd->opcode) { 1868 case O_CHECK_STATE: 1869 bprintf(bp, "check-state"); 1870 if (cmd->arg1 != 0) 1871 s = object_search_ctlv(fo->tstate, cmd->arg1, 1872 IPFW_TLV_STATE_NAME); 1873 else 1874 s = NULL; 1875 bprintf(bp, " :%s", s ? s: "any"); 1876 break; 1877 case O_ACCEPT: 1878 bprintf(bp, "allow"); 1879 break; 1880 case O_COUNT: 1881 bprintf(bp, "count"); 1882 break; 1883 case O_DENY: 1884 bprintf(bp, "deny"); 1885 break; 1886 case O_REJECT: 1887 if (cmd->arg1 == ICMP_REJECT_RST) 1888 bprintf(bp, "reset"); 1889 else if (cmd->arg1 == ICMP_REJECT_ABORT) 1890 bprintf(bp, "abort"); 1891 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1892 bprintf(bp, "reject"); 1893 else 1894 print_reject_code(bp, cmd->arg1); 1895 break; 1896 case O_UNREACH6: 1897 if (cmd->arg1 == ICMP6_UNREACH_RST) 1898 bprintf(bp, "reset6"); 1899 else if (cmd->arg1 == ICMP6_UNREACH_ABORT) 1900 bprintf(bp, "abort6"); 1901 else 1902 print_unreach6_code(bp, cmd->arg1); 1903 break; 1904 case O_SKIPTO: 1905 bprint_uint_arg(bp, "skipto ", cmd->arg1); 1906 break; 1907 case O_PIPE: 1908 bprint_uint_arg(bp, "pipe ", cmd->arg1); 1909 break; 1910 case O_QUEUE: 1911 bprint_uint_arg(bp, "queue ", cmd->arg1); 1912 break; 1913 case O_DIVERT: 1914 bprint_uint_arg(bp, "divert ", cmd->arg1); 1915 break; 1916 case O_TEE: 1917 bprint_uint_arg(bp, "tee ", cmd->arg1); 1918 break; 1919 case O_NETGRAPH: 1920 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 1921 break; 1922 case O_NGTEE: 1923 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 1924 break; 1925 case O_FORWARD_IP: 1926 case O_FORWARD_IP6: 1927 print_fwd(bp, cmd); 1928 break; 1929 case O_LOG: 1930 if (insntod(cmd, log)->max_log > 0) 1931 bprintf(bp, " log logamount %d", 1932 insntod(cmd, log)->max_log); 1933 else 1934 bprintf(bp, " log"); 1935 break; 1936 case O_ALTQ: 1937 #ifndef NO_ALTQ 1938 print_altq_cmd(bp, insntod(cmd, altq)); 1939 #endif 1940 break; 1941 case O_TAG: 1942 bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ": 1943 " tag ", cmd->arg1); 1944 break; 1945 case O_NAT: 1946 if (cmd->arg1 != IP_FW_NAT44_GLOBAL) 1947 bprint_uint_arg(bp, "nat ", cmd->arg1); 1948 else 1949 bprintf(bp, "nat global"); 1950 break; 1951 case O_SETFIB: 1952 if (cmd->arg1 == IP_FW_TARG) 1953 bprint_uint_arg(bp, "setfib ", cmd->arg1); 1954 else 1955 bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF); 1956 break; 1957 case O_EXTERNAL_ACTION: 1958 /* 1959 * The external action can consists of two following 1960 * each other opcodes - O_EXTERNAL_ACTION and 1961 * O_EXTERNAL_INSTANCE. The first contains the ID of 1962 * name of external action. The second contains the ID 1963 * of name of external action instance. 1964 * NOTE: in case when external action has no named 1965 * instances support, the second opcode isn't needed. 1966 */ 1967 state->eaction = cmd; 1968 s = object_search_ctlv(fo->tstate, cmd->arg1, 1969 IPFW_TLV_EACTION); 1970 if (match_token(rule_eactions, s) != -1) 1971 bprintf(bp, "%s", s); 1972 else 1973 bprintf(bp, "eaction %s", s); 1974 break; 1975 case O_EXTERNAL_INSTANCE: 1976 if (state->eaction == NULL) 1977 break; 1978 /* 1979 * XXX: we need to teach ipfw(9) to rewrite opcodes 1980 * in the user buffer on rule addition. When we add 1981 * the rule, we specify zero TLV type for 1982 * O_EXTERNAL_INSTANCE object. To show correct 1983 * rule after `ipfw add` we need to search instance 1984 * name with zero type. But when we do `ipfw show` 1985 * we calculate TLV type using IPFW_TLV_EACTION_NAME() 1986 * macro. 1987 */ 1988 s = object_search_ctlv(fo->tstate, cmd->arg1, 0); 1989 if (s == NULL) 1990 s = object_search_ctlv(fo->tstate, 1991 cmd->arg1, IPFW_TLV_EACTION_NAME( 1992 state->eaction->arg1)); 1993 bprintf(bp, " %s", s); 1994 break; 1995 case O_EXTERNAL_DATA: 1996 if (state->eaction == NULL) 1997 break; 1998 /* 1999 * Currently we support data formatting only for 2000 * external data with datalen u16. For unknown data 2001 * print its size in bytes. 2002 */ 2003 if (cmd->len == F_INSN_SIZE(ipfw_insn)) 2004 bprintf(bp, " %u", cmd->arg1); 2005 else 2006 bprintf(bp, " %ubytes", 2007 cmd->len * sizeof(uint32_t)); 2008 break; 2009 case O_SETDSCP: 2010 if (cmd->arg1 == IP_FW_TARG) { 2011 bprintf(bp, "setdscp tablearg"); 2012 break; 2013 } 2014 s = match_value(f_ipdscp, cmd->arg1 & 0x3F); 2015 if (s != NULL) 2016 bprintf(bp, "setdscp %s", s); 2017 else 2018 bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F); 2019 break; 2020 case O_REASS: 2021 bprintf(bp, "reass"); 2022 break; 2023 case O_CALLRETURN: 2024 if (cmd->len & F_NOT) 2025 bprintf(bp, "return"); 2026 else 2027 bprint_uint_arg(bp, "call ", cmd->arg1); 2028 break; 2029 default: 2030 bprintf(bp, "** unrecognized action %d len %d ", 2031 cmd->opcode, cmd->len); 2032 } 2033 mark_printed(state, cmd); 2034 2035 return (1); 2036 } 2037 2038 2039 static ipfw_insn * 2040 print_action(struct buf_pr *bp, struct format_opts *fo, 2041 struct show_state *state, uint8_t opcode) 2042 { 2043 ipfw_insn *cmd; 2044 int l; 2045 2046 for (l = state->rule->cmd_len - state->rule->act_ofs, 2047 cmd = ACTION_PTR(state->rule); l > 0; 2048 l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2049 if (cmd->opcode != opcode) 2050 continue; 2051 if (!print_action_instruction(bp, fo, state, cmd)) 2052 continue; 2053 return (cmd); 2054 } 2055 return (NULL); 2056 } 2057 2058 static void 2059 print_proto(struct buf_pr *bp, struct format_opts *fo, 2060 struct show_state *state) 2061 { 2062 ipfw_insn *cmd; 2063 int l, proto, ip4, ip6; 2064 2065 /* Count all O_PROTO, O_IP4, O_IP6 instructions. */ 2066 proto = ip4 = ip6 = 0; 2067 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2068 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2069 switch (cmd->opcode) { 2070 case O_PROTO: 2071 proto++; 2072 break; 2073 case O_IP4: 2074 ip4 = 1; 2075 if (cmd->len & F_OR) 2076 ip4++; 2077 break; 2078 case O_IP6: 2079 ip6 = 1; 2080 if (cmd->len & F_OR) 2081 ip6++; 2082 break; 2083 default: 2084 continue; 2085 } 2086 } 2087 if (proto == 0 && ip4 == 0 && ip6 == 0) { 2088 state->proto = IPPROTO_IP; 2089 state->flags |= HAVE_PROTO; 2090 bprintf(bp, " ip"); 2091 return; 2092 } 2093 /* To handle the case { ip4 or ip6 }, print opcode with F_OR first */ 2094 cmd = NULL; 2095 if (ip4 || ip6) 2096 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6); 2097 if (cmd != NULL && (cmd->len & F_OR)) 2098 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4); 2099 if (cmd == NULL || (cmd->len & F_OR)) 2100 for (l = proto; l > 0; l--) { 2101 cmd = print_opcode(bp, fo, state, O_PROTO); 2102 if (cmd == NULL || (cmd->len & F_OR) == 0) 2103 break; 2104 } 2105 /* Initialize proto, it is used by print_newports() */ 2106 state->flags |= HAVE_PROTO; 2107 if (state->proto == 0 && ip6 != 0) 2108 state->proto = IPPROTO_IPV6; 2109 } 2110 2111 static int 2112 match_opcode(int opcode, const int opcodes[], size_t nops) 2113 { 2114 size_t i; 2115 2116 for (i = 0; i < nops; i++) 2117 if (opcode == opcodes[i]) 2118 return (1); 2119 return (0); 2120 } 2121 2122 static void 2123 print_address(struct buf_pr *bp, struct format_opts *fo, 2124 struct show_state *state, const int opcodes[], size_t nops, int portop, 2125 int flag) 2126 { 2127 ipfw_insn *cmd; 2128 int count, l, portcnt, pf; 2129 2130 count = portcnt = 0; 2131 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2132 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2133 if (match_opcode(cmd->opcode, opcodes, nops)) 2134 count++; 2135 else if (cmd->opcode == portop) 2136 portcnt++; 2137 } 2138 if (count == 0) 2139 bprintf(bp, " any"); 2140 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2141 l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2142 if (!match_opcode(cmd->opcode, opcodes, nops)) 2143 continue; 2144 print_instruction(bp, fo, state, cmd); 2145 if ((cmd->len & F_OR) == 0) 2146 break; 2147 count--; 2148 } 2149 /* 2150 * If several O_IP_?PORT opcodes specified, leave them to the 2151 * options section. 2152 */ 2153 if (portcnt == 1) { 2154 for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0; 2155 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2156 if (cmd->opcode != portop) { 2157 pf = (cmd->len & F_OR); 2158 continue; 2159 } 2160 /* Print opcode iff it is not in OR block. */ 2161 if (pf == 0 && (cmd->len & F_OR) == 0) 2162 print_instruction(bp, fo, state, cmd); 2163 break; 2164 } 2165 } 2166 state->flags |= flag; 2167 } 2168 2169 static const int action_opcodes[] = { 2170 O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT, 2171 O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE, 2172 O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT, 2173 O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN, 2174 /* keep the following opcodes at the end of the list */ 2175 O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA 2176 }; 2177 2178 static const int modifier_opcodes[] = { 2179 O_LOG, O_ALTQ, O_TAG 2180 }; 2181 2182 static const int src_opcodes[] = { 2183 O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME, 2184 O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME 2185 }; 2186 2187 static const int dst_opcodes[] = { 2188 O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME, 2189 O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME 2190 }; 2191 2192 static void 2193 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 2194 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 2195 { 2196 static int twidth = 0; 2197 struct show_state state; 2198 ipfw_insn *cmd; 2199 size_t i; 2200 2201 /* Print # DISABLED or skip the rule */ 2202 if ((fo->set_mask & (1 << rule->set)) == 0) { 2203 /* disabled mask */ 2204 if (!co->show_sets) 2205 return; 2206 else 2207 bprintf(bp, "# DISABLED "); 2208 } 2209 if (init_show_state(&state, rule) != 0) { 2210 warn("init_show_state() failed"); 2211 return; 2212 } 2213 bprintf(bp, "%05u ", rule->rulenum); 2214 2215 /* only if counters are available */ 2216 if (cntr != NULL) { 2217 /* Print counters if enabled */ 2218 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2219 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 2220 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 2221 } 2222 2223 /* Print timestamp */ 2224 if (co->do_time == TIMESTAMP_NUMERIC) 2225 bprintf(bp, "%10u ", cntr->timestamp); 2226 else if (co->do_time == TIMESTAMP_STRING) { 2227 char timestr[30]; 2228 time_t t = (time_t)0; 2229 2230 if (twidth == 0) { 2231 strcpy(timestr, ctime(&t)); 2232 *strchr(timestr, '\n') = '\0'; 2233 twidth = strlen(timestr); 2234 } 2235 if (cntr->timestamp > 0) { 2236 t = _long_to_time(cntr->timestamp); 2237 2238 strcpy(timestr, ctime(&t)); 2239 *strchr(timestr, '\n') = '\0'; 2240 bprintf(bp, "%s ", timestr); 2241 } else { 2242 bprintf(bp, "%*s ", twidth, ""); 2243 } 2244 } 2245 } 2246 2247 /* Print set number */ 2248 if (co->show_sets) 2249 bprintf(bp, "set %d ", rule->set); 2250 2251 /* Print the optional "match probability" */ 2252 cmd = print_opcode(bp, fo, &state, O_PROB); 2253 /* Print rule action */ 2254 for (i = 0; i < nitems(action_opcodes); i++) { 2255 cmd = print_action(bp, fo, &state, action_opcodes[i]); 2256 if (cmd == NULL) 2257 continue; 2258 /* Handle special cases */ 2259 switch (cmd->opcode) { 2260 case O_CHECK_STATE: 2261 goto end; 2262 case O_EXTERNAL_ACTION: 2263 case O_EXTERNAL_INSTANCE: 2264 /* External action can have several instructions */ 2265 continue; 2266 } 2267 break; 2268 } 2269 /* Print rule modifiers */ 2270 for (i = 0; i < nitems(modifier_opcodes); i++) 2271 print_action(bp, fo, &state, modifier_opcodes[i]); 2272 /* 2273 * Print rule body 2274 */ 2275 if (co->comment_only != 0) 2276 goto end; 2277 2278 if (rule->flags & IPFW_RULE_JUSTOPTS) { 2279 state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; 2280 goto justopts; 2281 } 2282 2283 print_proto(bp, fo, &state); 2284 if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT)) 2285 goto justopts; 2286 2287 /* Print source */ 2288 bprintf(bp, " from"); 2289 print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes), 2290 O_IP_SRCPORT, HAVE_SRCIP); 2291 2292 /* Print destination */ 2293 bprintf(bp, " to"); 2294 print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes), 2295 O_IP_DSTPORT, HAVE_DSTIP); 2296 2297 justopts: 2298 /* Print the rest of options */ 2299 while (print_opcode(bp, fo, &state, -1)) 2300 ; 2301 end: 2302 /* Print comment at the end */ 2303 cmd = print_opcode(bp, fo, &state, O_NOP); 2304 if (co->comment_only != 0 && cmd == NULL) 2305 bprintf(bp, " // ..."); 2306 bprintf(bp, "\n"); 2307 free_show_state(&state); 2308 } 2309 2310 static void 2311 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2312 struct buf_pr *bp, ipfw_dyn_rule *d) 2313 { 2314 struct protoent *pe; 2315 struct in_addr a; 2316 uint16_t rulenum; 2317 char buf[INET6_ADDRSTRLEN]; 2318 2319 if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT) 2320 return; 2321 2322 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2323 bprintf(bp, "%05d", rulenum); 2324 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2325 bprintf(bp, " "); 2326 pr_u64(bp, &d->pcnt, fo->pcwidth); 2327 pr_u64(bp, &d->bcnt, fo->bcwidth); 2328 bprintf(bp, "(%ds)", d->expire); 2329 } 2330 switch (d->dyn_type) { 2331 case O_LIMIT_PARENT: 2332 bprintf(bp, " PARENT %d", d->count); 2333 break; 2334 case O_LIMIT: 2335 bprintf(bp, " LIMIT"); 2336 break; 2337 case O_KEEP_STATE: /* bidir, no mask */ 2338 bprintf(bp, " STATE"); 2339 break; 2340 } 2341 2342 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2343 bprintf(bp, " %s", pe->p_name); 2344 else 2345 bprintf(bp, " proto %u", d->id.proto); 2346 2347 if (d->id.addr_type == 4) { 2348 a.s_addr = htonl(d->id.src_ip); 2349 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2350 2351 a.s_addr = htonl(d->id.dst_ip); 2352 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2353 } else if (d->id.addr_type == 6) { 2354 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2355 sizeof(buf)), d->id.src_port); 2356 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2357 buf, sizeof(buf)), d->id.dst_port); 2358 } else 2359 bprintf(bp, " UNKNOWN <-> UNKNOWN"); 2360 if (d->kidx != 0) 2361 bprintf(bp, " :%s", object_search_ctlv(fo->tstate, 2362 d->kidx, IPFW_TLV_STATE_NAME)); 2363 2364 #define BOTH_SYN (TH_SYN | (TH_SYN << 8)) 2365 #define BOTH_FIN (TH_FIN | (TH_FIN << 8)) 2366 if (co->verbose) { 2367 bprintf(bp, " state 0x%08x%s", d->state, 2368 d->state ? " ": ","); 2369 if (d->state & IPFW_DYN_ORPHANED) 2370 bprintf(bp, "ORPHANED,"); 2371 if ((d->state & BOTH_SYN) == BOTH_SYN) 2372 bprintf(bp, "BOTH_SYN,"); 2373 else { 2374 if (d->state & TH_SYN) 2375 bprintf(bp, "F_SYN,"); 2376 if (d->state & (TH_SYN << 8)) 2377 bprintf(bp, "R_SYN,"); 2378 } 2379 if ((d->state & BOTH_FIN) == BOTH_FIN) 2380 bprintf(bp, "BOTH_FIN,"); 2381 else { 2382 if (d->state & TH_FIN) 2383 bprintf(bp, "F_FIN,"); 2384 if (d->state & (TH_FIN << 8)) 2385 bprintf(bp, "R_FIN,"); 2386 } 2387 bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd, 2388 d->ack_rev); 2389 } 2390 } 2391 2392 static int 2393 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2394 { 2395 ipfw_range_header rh; 2396 size_t sz; 2397 2398 memset(&rh, 0, sizeof(rh)); 2399 memcpy(&rh.range, rt, sizeof(*rt)); 2400 rh.range.head.length = sizeof(*rt); 2401 rh.range.head.type = IPFW_TLV_RANGE; 2402 sz = sizeof(rh); 2403 2404 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2405 return (-1); 2406 /* Save number of matched objects */ 2407 rt->new_set = rh.range.new_set; 2408 return (0); 2409 } 2410 2411 /* 2412 * This one handles all set-related commands 2413 * ipfw set { show | enable | disable } 2414 * ipfw set swap X Y 2415 * ipfw set move X to Y 2416 * ipfw set move rule X to Y 2417 */ 2418 void 2419 ipfw_sets_handler(char *av[]) 2420 { 2421 ipfw_range_tlv rt; 2422 const char *msg; 2423 size_t size; 2424 uint32_t masks[2]; 2425 int i; 2426 uint16_t rulenum; 2427 uint8_t cmd; 2428 2429 av++; 2430 memset(&rt, 0, sizeof(rt)); 2431 2432 if (av[0] == NULL) 2433 errx(EX_USAGE, "set needs command"); 2434 if (_substrcmp(*av, "show") == 0) { 2435 struct format_opts fo; 2436 ipfw_cfg_lheader *cfg; 2437 2438 memset(&fo, 0, sizeof(fo)); 2439 if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0) 2440 err(EX_OSERR, "requesting config failed"); 2441 2442 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2443 if ((cfg->set_mask & (1<<i)) == 0) { 2444 printf("%s %d", msg, i); 2445 msg = ""; 2446 } 2447 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2448 for (i = 0; i < RESVD_SET; i++) 2449 if ((cfg->set_mask & (1<<i)) != 0) { 2450 printf("%s %d", msg, i); 2451 msg = ""; 2452 } 2453 printf("\n"); 2454 free(cfg); 2455 } else if (_substrcmp(*av, "swap") == 0) { 2456 av++; 2457 if ( av[0] == NULL || av[1] == NULL ) 2458 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2459 rt.set = atoi(av[0]); 2460 rt.new_set = atoi(av[1]); 2461 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2462 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2463 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2464 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2465 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2466 } else if (_substrcmp(*av, "move") == 0) { 2467 av++; 2468 if (av[0] && _substrcmp(*av, "rule") == 0) { 2469 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2470 cmd = IP_FW_XMOVE; 2471 av++; 2472 } else 2473 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2474 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2475 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2476 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2477 rulenum = atoi(av[0]); 2478 rt.new_set = atoi(av[2]); 2479 if (cmd == IP_FW_XMOVE) { 2480 rt.start_rule = rulenum; 2481 rt.end_rule = rulenum; 2482 } else 2483 rt.set = rulenum; 2484 rt.new_set = atoi(av[2]); 2485 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2486 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2487 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2488 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2489 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2490 i = do_range_cmd(cmd, &rt); 2491 if (i < 0) 2492 err(EX_OSERR, "failed to move %s", 2493 cmd == IP_FW_SET_MOVE ? "set": "rule"); 2494 } else if (_substrcmp(*av, "disable") == 0 || 2495 _substrcmp(*av, "enable") == 0 ) { 2496 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2497 2498 av++; 2499 masks[0] = masks[1] = 0; 2500 2501 while (av[0]) { 2502 if (isdigit(**av)) { 2503 i = atoi(*av); 2504 if (i < 0 || i > RESVD_SET) 2505 errx(EX_DATAERR, 2506 "invalid set number %d\n", i); 2507 masks[which] |= (1<<i); 2508 } else if (_substrcmp(*av, "disable") == 0) 2509 which = 0; 2510 else if (_substrcmp(*av, "enable") == 0) 2511 which = 1; 2512 else 2513 errx(EX_DATAERR, 2514 "invalid set command %s\n", *av); 2515 av++; 2516 } 2517 if ( (masks[0] & masks[1]) != 0 ) 2518 errx(EX_DATAERR, 2519 "cannot enable and disable the same set\n"); 2520 2521 rt.set = masks[0]; 2522 rt.new_set = masks[1]; 2523 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2524 if (i) 2525 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2526 } else 2527 errx(EX_USAGE, "invalid set command %s\n", *av); 2528 } 2529 2530 void 2531 ipfw_sysctl_handler(char *av[], int which) 2532 { 2533 av++; 2534 2535 if (av[0] == NULL) { 2536 warnx("missing keyword to enable/disable\n"); 2537 } else if (_substrcmp(*av, "firewall") == 0) { 2538 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2539 &which, sizeof(which)); 2540 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2541 &which, sizeof(which)); 2542 } else if (_substrcmp(*av, "one_pass") == 0) { 2543 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2544 &which, sizeof(which)); 2545 } else if (_substrcmp(*av, "debug") == 0) { 2546 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2547 &which, sizeof(which)); 2548 } else if (_substrcmp(*av, "verbose") == 0) { 2549 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2550 &which, sizeof(which)); 2551 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2552 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2553 &which, sizeof(which)); 2554 #ifndef NO_ALTQ 2555 } else if (_substrcmp(*av, "altq") == 0) { 2556 altq_set_enabled(which); 2557 #endif 2558 } else { 2559 warnx("unrecognize enable/disable keyword: %s\n", *av); 2560 } 2561 } 2562 2563 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2564 void *arg, void *state); 2565 2566 static void 2567 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2568 void *arg __unused, void *_state) 2569 { 2570 ipfw_dyn_rule *d; 2571 int width; 2572 uint8_t set; 2573 2574 d = (ipfw_dyn_rule *)_state; 2575 /* Count _ALL_ states */ 2576 fo->dcnt++; 2577 2578 if (fo->show_counters == 0) 2579 return; 2580 2581 if (co->use_set) { 2582 /* skip states from another set */ 2583 bcopy((char *)&d->rule + sizeof(uint16_t), &set, 2584 sizeof(uint8_t)); 2585 if (set != co->use_set - 1) 2586 return; 2587 } 2588 2589 width = pr_u64(NULL, &d->pcnt, 0); 2590 if (width > fo->pcwidth) 2591 fo->pcwidth = width; 2592 2593 width = pr_u64(NULL, &d->bcnt, 0); 2594 if (width > fo->bcwidth) 2595 fo->bcwidth = width; 2596 } 2597 2598 static int 2599 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2600 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2601 { 2602 int ttype; 2603 state_cb *fptr; 2604 void *farg; 2605 ipfw_obj_tlv *tlv; 2606 ipfw_obj_ctlv *ctlv; 2607 2608 fptr = NULL; 2609 ttype = 0; 2610 2611 while (sz > 0) { 2612 ctlv = (ipfw_obj_ctlv *)base; 2613 switch (ctlv->head.type) { 2614 case IPFW_TLV_DYNSTATE_LIST: 2615 base += sizeof(*ctlv); 2616 sz -= sizeof(*ctlv); 2617 ttype = IPFW_TLV_DYN_ENT; 2618 fptr = dyn_bc; 2619 farg = dyn_arg; 2620 break; 2621 default: 2622 return (sz); 2623 } 2624 2625 while (sz > 0) { 2626 tlv = (ipfw_obj_tlv *)base; 2627 if (tlv->type != ttype) 2628 break; 2629 2630 fptr(co, fo, farg, tlv + 1); 2631 sz -= tlv->length; 2632 base += tlv->length; 2633 } 2634 } 2635 2636 return (sz); 2637 } 2638 2639 static void 2640 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2641 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2642 { 2643 int bcwidth, pcwidth, width; 2644 int n; 2645 struct ip_fw_bcounter *cntr; 2646 struct ip_fw_rule *r; 2647 2648 bcwidth = 0; 2649 pcwidth = 0; 2650 if (fo->show_counters != 0) { 2651 for (n = 0; n < rcnt; n++, 2652 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2653 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2654 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2655 /* skip rules from another set */ 2656 if (co->use_set && r->set != co->use_set - 1) 2657 continue; 2658 2659 /* packet counter */ 2660 width = pr_u64(NULL, &cntr->pcnt, 0); 2661 if (width > pcwidth) 2662 pcwidth = width; 2663 2664 /* byte counter */ 2665 width = pr_u64(NULL, &cntr->bcnt, 0); 2666 if (width > bcwidth) 2667 bcwidth = width; 2668 } 2669 } 2670 fo->bcwidth = bcwidth; 2671 fo->pcwidth = pcwidth; 2672 2673 fo->dcnt = 0; 2674 if (co->do_dynamic && dynsz > 0) 2675 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2676 } 2677 2678 static int 2679 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2680 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2681 { 2682 int n, seen; 2683 struct ip_fw_rule *r; 2684 struct ip_fw_bcounter *cntr; 2685 2686 for (n = seen = 0; n < rcnt; n++, 2687 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2688 2689 if ((fo->show_counters | fo->show_time) != 0) { 2690 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2691 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2692 } else { 2693 cntr = NULL; 2694 r = (struct ip_fw_rule *)(rtlv + 1); 2695 } 2696 if (r->rulenum > fo->last) 2697 break; 2698 if (co->use_set && r->set != co->use_set - 1) 2699 continue; 2700 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2701 show_static_rule(co, fo, bp, r, cntr); 2702 printf("%s", bp->buf); 2703 bp_flush(bp); 2704 seen++; 2705 } 2706 } 2707 2708 return (seen); 2709 } 2710 2711 static void 2712 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2713 void *_arg, void *_state) 2714 { 2715 uint16_t rulenum; 2716 uint8_t set; 2717 ipfw_dyn_rule *d; 2718 struct buf_pr *bp; 2719 2720 d = (ipfw_dyn_rule *)_state; 2721 bp = (struct buf_pr *)_arg; 2722 2723 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2724 if (rulenum > fo->last) 2725 return; 2726 if (co->use_set) { 2727 bcopy((char *)&d->rule + sizeof(uint16_t), 2728 &set, sizeof(uint8_t)); 2729 if (set != co->use_set - 1) 2730 return; 2731 } 2732 if (rulenum >= fo->first) { 2733 show_dyn_state(co, fo, bp, d); 2734 printf("%s\n", bp->buf); 2735 bp_flush(bp); 2736 } 2737 } 2738 2739 static int 2740 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2741 struct buf_pr *bp, caddr_t base, size_t sz) 2742 { 2743 2744 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2745 return (sz); 2746 } 2747 2748 void 2749 ipfw_list(int ac, char *av[], int show_counters) 2750 { 2751 ipfw_cfg_lheader *cfg; 2752 struct format_opts sfo; 2753 size_t sz; 2754 int error; 2755 int lac; 2756 char **lav; 2757 uint32_t rnum; 2758 char *endptr; 2759 2760 if (g_co.test_only) { 2761 fprintf(stderr, "Testing only, list disabled\n"); 2762 return; 2763 } 2764 if (g_co.do_pipe) { 2765 dummynet_list(ac, av, show_counters); 2766 return; 2767 } 2768 2769 ac--; 2770 av++; 2771 memset(&sfo, 0, sizeof(sfo)); 2772 2773 /* Determine rule range to request */ 2774 if (ac > 0) { 2775 for (lac = ac, lav = av; lac != 0; lac--) { 2776 rnum = strtoul(*lav++, &endptr, 10); 2777 if (sfo.first == 0 || rnum < sfo.first) 2778 sfo.first = rnum; 2779 2780 if (*endptr == '-') 2781 rnum = strtoul(endptr + 1, &endptr, 10); 2782 if (sfo.last == 0 || rnum > sfo.last) 2783 sfo.last = rnum; 2784 } 2785 } 2786 2787 /* get configuraion from kernel */ 2788 cfg = NULL; 2789 sfo.show_counters = show_counters; 2790 sfo.show_time = g_co.do_time; 2791 if (g_co.do_dynamic != 2) 2792 sfo.flags |= IPFW_CFG_GET_STATIC; 2793 if (g_co.do_dynamic != 0) 2794 sfo.flags |= IPFW_CFG_GET_STATES; 2795 if ((sfo.show_counters | sfo.show_time) != 0) 2796 sfo.flags |= IPFW_CFG_GET_COUNTERS; 2797 if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0) 2798 err(EX_OSERR, "retrieving config failed"); 2799 2800 error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av); 2801 2802 free(cfg); 2803 2804 if (error != EX_OK) 2805 exit(error); 2806 } 2807 2808 static int 2809 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 2810 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 2811 { 2812 caddr_t dynbase; 2813 size_t dynsz; 2814 int rcnt; 2815 int exitval = EX_OK; 2816 int lac; 2817 char **lav; 2818 char *endptr; 2819 size_t readsz; 2820 struct buf_pr bp; 2821 ipfw_obj_ctlv *ctlv; 2822 ipfw_obj_tlv *rbase; 2823 2824 /* 2825 * Handle tablenames TLV first, if any 2826 */ 2827 rbase = NULL; 2828 dynbase = NULL; 2829 dynsz = 0; 2830 readsz = sizeof(*cfg); 2831 rcnt = 0; 2832 2833 fo->set_mask = cfg->set_mask; 2834 2835 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 2836 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 2837 object_sort_ctlv(ctlv); 2838 fo->tstate = ctlv; 2839 readsz += ctlv->head.length; 2840 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 2841 } 2842 2843 if (cfg->flags & IPFW_CFG_GET_STATIC) { 2844 /* We've requested static rules */ 2845 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 2846 rbase = (ipfw_obj_tlv *)(ctlv + 1); 2847 rcnt = ctlv->count; 2848 readsz += ctlv->head.length; 2849 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2850 ctlv->head.length); 2851 } 2852 } 2853 2854 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 2855 /* We may have some dynamic states */ 2856 dynsz = sz - readsz; 2857 /* Skip empty header */ 2858 if (dynsz != sizeof(ipfw_obj_ctlv)) 2859 dynbase = (caddr_t)ctlv; 2860 else 2861 dynsz = 0; 2862 } 2863 2864 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 2865 bp_alloc(&bp, 4096); 2866 2867 /* if no rule numbers were specified, list all rules */ 2868 if (ac == 0) { 2869 fo->first = 0; 2870 fo->last = IPFW_DEFAULT_RULE; 2871 if (cfg->flags & IPFW_CFG_GET_STATIC) 2872 list_static_range(co, fo, &bp, rbase, rcnt); 2873 2874 if (co->do_dynamic && dynsz > 0) { 2875 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, 2876 dynsz); 2877 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2878 } 2879 2880 bp_free(&bp); 2881 return (EX_OK); 2882 } 2883 2884 /* display specific rules requested on command line */ 2885 for (lac = ac, lav = av; lac != 0; lac--) { 2886 /* convert command line rule # */ 2887 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2888 if (*endptr == '-') 2889 fo->last = strtoul(endptr + 1, &endptr, 10); 2890 if (*endptr) { 2891 exitval = EX_USAGE; 2892 warnx("invalid rule number: %s", *(lav - 1)); 2893 continue; 2894 } 2895 2896 if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0) 2897 continue; 2898 2899 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 2900 /* give precedence to other error(s) */ 2901 if (exitval == EX_OK) 2902 exitval = EX_UNAVAILABLE; 2903 if (fo->first == fo->last) 2904 warnx("rule %u does not exist", fo->first); 2905 else 2906 warnx("no rules in range %u-%u", 2907 fo->first, fo->last); 2908 } 2909 } 2910 2911 if (co->do_dynamic && dynsz > 0) { 2912 printf("## Dynamic rules:\n"); 2913 for (lac = ac, lav = av; lac != 0; lac--) { 2914 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2915 if (*endptr == '-') 2916 fo->last = strtoul(endptr+1, &endptr, 10); 2917 if (*endptr) 2918 /* already warned */ 2919 continue; 2920 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2921 } 2922 } 2923 2924 bp_free(&bp); 2925 return (exitval); 2926 } 2927 2928 2929 /* 2930 * Retrieves current ipfw configuration of given type 2931 * and stores its pointer to @pcfg. 2932 * 2933 * Caller is responsible for freeing @pcfg. 2934 * 2935 * Returns 0 on success. 2936 */ 2937 2938 static int 2939 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 2940 ipfw_cfg_lheader **pcfg, size_t *psize) 2941 { 2942 ipfw_cfg_lheader *cfg; 2943 size_t sz; 2944 int i; 2945 2946 2947 if (co->test_only != 0) { 2948 fprintf(stderr, "Testing only, list disabled\n"); 2949 return (0); 2950 } 2951 2952 /* Start with some data size */ 2953 sz = 4096; 2954 cfg = NULL; 2955 2956 for (i = 0; i < 16; i++) { 2957 if (cfg != NULL) 2958 free(cfg); 2959 if ((cfg = calloc(1, sz)) == NULL) 2960 return (ENOMEM); 2961 2962 cfg->flags = fo->flags; 2963 cfg->start_rule = fo->first; 2964 cfg->end_rule = fo->last; 2965 2966 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 2967 if (errno != ENOMEM) { 2968 free(cfg); 2969 return (errno); 2970 } 2971 2972 /* Buffer size is not enough. Try to increase */ 2973 sz = sz * 2; 2974 if (sz < cfg->size) 2975 sz = cfg->size; 2976 continue; 2977 } 2978 2979 *pcfg = cfg; 2980 *psize = sz; 2981 return (0); 2982 } 2983 2984 free(cfg); 2985 return (ENOMEM); 2986 } 2987 2988 static int 2989 lookup_host (char *host, struct in_addr *ipaddr) 2990 { 2991 struct hostent *he; 2992 2993 if (!inet_aton(host, ipaddr)) { 2994 if ((he = gethostbyname(host)) == NULL) 2995 return(-1); 2996 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 2997 } 2998 return(0); 2999 } 3000 3001 struct tidx { 3002 ipfw_obj_ntlv *idx; 3003 uint32_t count; 3004 uint32_t size; 3005 uint16_t counter; 3006 uint8_t set; 3007 }; 3008 3009 int 3010 ipfw_check_object_name(const char *name) 3011 { 3012 int c, i, l; 3013 3014 /* 3015 * Check that name is null-terminated and contains 3016 * valid symbols only. Valid mask is: 3017 * [a-zA-Z0-9\-_\.]{1,63} 3018 */ 3019 l = strlen(name); 3020 if (l == 0 || l >= 64) 3021 return (EINVAL); 3022 for (i = 0; i < l; i++) { 3023 c = name[i]; 3024 if (isalpha(c) || isdigit(c) || c == '_' || 3025 c == '-' || c == '.') 3026 continue; 3027 return (EINVAL); 3028 } 3029 return (0); 3030 } 3031 3032 static const char *default_state_name = "default"; 3033 3034 static int 3035 state_check_name(const char *name) 3036 { 3037 3038 if (ipfw_check_object_name(name) != 0) 3039 return (EINVAL); 3040 if (strcmp(name, "any") == 0) 3041 return (EINVAL); 3042 return (0); 3043 } 3044 3045 static int 3046 eaction_check_name(const char *name) 3047 { 3048 3049 if (ipfw_check_object_name(name) != 0) 3050 return (EINVAL); 3051 /* Restrict some 'special' names */ 3052 if (match_token(rule_actions, name) != -1 && 3053 match_token(rule_action_params, name) != -1) 3054 return (EINVAL); 3055 return (0); 3056 } 3057 3058 static uint16_t 3059 pack_object(struct tidx *tstate, const char *name, int otype) 3060 { 3061 ipfw_obj_ntlv *ntlv; 3062 uint32_t i; 3063 3064 for (i = 0; i < tstate->count; i++) { 3065 if (strcmp(tstate->idx[i].name, name) != 0) 3066 continue; 3067 if (tstate->idx[i].set != tstate->set) 3068 continue; 3069 if (tstate->idx[i].head.type != otype) 3070 continue; 3071 3072 return (tstate->idx[i].idx); 3073 } 3074 3075 if (tstate->count + 1 > tstate->size) { 3076 tstate->size += 4; 3077 tstate->idx = realloc(tstate->idx, tstate->size * 3078 sizeof(ipfw_obj_ntlv)); 3079 if (tstate->idx == NULL) 3080 return (0); 3081 } 3082 3083 ntlv = &tstate->idx[i]; 3084 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 3085 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 3086 ntlv->head.type = otype; 3087 ntlv->head.length = sizeof(ipfw_obj_ntlv); 3088 ntlv->set = tstate->set; 3089 ntlv->idx = ++tstate->counter; 3090 tstate->count++; 3091 3092 return (ntlv->idx); 3093 } 3094 3095 static uint16_t 3096 pack_table(struct tidx *tstate, const char *name) 3097 { 3098 3099 if (table_check_name(name) != 0) 3100 return (0); 3101 3102 return (pack_object(tstate, name, IPFW_TLV_TBL_NAME)); 3103 } 3104 3105 void 3106 fill_table(struct _ipfw_insn *cmd, char *av, uint8_t opcode, 3107 struct tidx *tstate) 3108 { 3109 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3110 uint16_t uidx; 3111 char *p; 3112 3113 if ((p = strchr(av + 6, ')')) == NULL) 3114 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 3115 *p = '\0'; 3116 p = strchr(av + 6, ','); 3117 if (p) 3118 *p++ = '\0'; 3119 3120 if ((uidx = pack_table(tstate, av + 6)) == 0) 3121 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 3122 3123 cmd->opcode = opcode; 3124 cmd->arg1 = uidx; 3125 if (p) { 3126 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3127 d[0] = strtoul(p, NULL, 0); 3128 } else 3129 cmd->len |= F_INSN_SIZE(ipfw_insn); 3130 } 3131 3132 3133 /* 3134 * fills the addr and mask fields in the instruction as appropriate from av. 3135 * Update length as appropriate. 3136 * The following formats are allowed: 3137 * me returns O_IP_*_ME 3138 * 1.2.3.4 single IP address 3139 * 1.2.3.4:5.6.7.8 address:mask 3140 * 1.2.3.4/24 address/mask 3141 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 3142 * We can have multiple comma-separated address/mask entries. 3143 */ 3144 static void 3145 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 3146 { 3147 int len = 0; 3148 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3149 3150 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 3151 3152 if (_substrcmp(av, "any") == 0) 3153 return; 3154 3155 if (_substrcmp(av, "me") == 0) { 3156 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 3157 return; 3158 } 3159 3160 if (strncmp(av, "table(", 6) == 0) { 3161 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 3162 return; 3163 } 3164 3165 while (av) { 3166 /* 3167 * After the address we can have '/' or ':' indicating a mask, 3168 * ',' indicating another address follows, '{' indicating a 3169 * set of addresses of unspecified size. 3170 */ 3171 char *t = NULL, *p = strpbrk(av, "/:,{"); 3172 int masklen; 3173 char md, nd = '\0'; 3174 3175 CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len); 3176 3177 if (p) { 3178 md = *p; 3179 *p++ = '\0'; 3180 if ((t = strpbrk(p, ",{")) != NULL) { 3181 nd = *t; 3182 *t = '\0'; 3183 } 3184 } else 3185 md = '\0'; 3186 3187 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 3188 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 3189 switch (md) { 3190 case ':': 3191 if (!inet_aton(p, (struct in_addr *)&d[1])) 3192 errx(EX_DATAERR, "bad netmask ``%s''", p); 3193 break; 3194 case '/': 3195 masklen = atoi(p); 3196 if (masklen == 0) 3197 d[1] = htonl(0U); /* mask */ 3198 else if (masklen > 32) 3199 errx(EX_DATAERR, "bad width ``%s''", p); 3200 else 3201 d[1] = htonl(~0U << (32 - masklen)); 3202 break; 3203 case '{': /* no mask, assume /24 and put back the '{' */ 3204 d[1] = htonl(~0U << (32 - 24)); 3205 *(--p) = md; 3206 break; 3207 3208 case ',': /* single address plus continuation */ 3209 *(--p) = md; 3210 /* FALLTHROUGH */ 3211 case 0: /* initialization value */ 3212 default: 3213 d[1] = htonl(~0U); /* force /32 */ 3214 break; 3215 } 3216 d[0] &= d[1]; /* mask base address with mask */ 3217 if (t) 3218 *t = nd; 3219 /* find next separator */ 3220 if (p) 3221 p = strpbrk(p, ",{"); 3222 if (p && *p == '{') { 3223 /* 3224 * We have a set of addresses. They are stored as follows: 3225 * arg1 is the set size (powers of 2, 2..256) 3226 * addr is the base address IN HOST FORMAT 3227 * mask.. is an array of arg1 bits (rounded up to 3228 * the next multiple of 32) with bits set 3229 * for each host in the map. 3230 */ 3231 uint32_t *map = (uint32_t *)&cmd->mask; 3232 int low, high; 3233 int i = contigmask((uint8_t *)&(d[1]), 32); 3234 3235 if (len > 0) 3236 errx(EX_DATAERR, "address set cannot be in a list"); 3237 if (i < 24 || i > 31) 3238 errx(EX_DATAERR, "invalid set with mask %d\n", i); 3239 cmd->o.arg1 = 1<<(32-i); /* map length */ 3240 d[0] = ntohl(d[0]); /* base addr in host format */ 3241 cmd->o.opcode = O_IP_DST_SET; /* default */ 3242 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 3243 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 3244 map[i] = 0; /* clear map */ 3245 3246 av = p + 1; 3247 low = d[0] & 0xff; 3248 high = low + cmd->o.arg1 - 1; 3249 /* 3250 * Here, i stores the previous value when we specify a range 3251 * of addresses within a mask, e.g. 45-63. i = -1 means we 3252 * have no previous value. 3253 */ 3254 i = -1; /* previous value in a range */ 3255 while (isdigit(*av)) { 3256 char *s; 3257 int a = strtol(av, &s, 0); 3258 3259 if (s == av) { /* no parameter */ 3260 if (*av != '}') 3261 errx(EX_DATAERR, "set not closed\n"); 3262 if (i != -1) 3263 errx(EX_DATAERR, "incomplete range %d-", i); 3264 break; 3265 } 3266 if (a < low || a > high) 3267 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 3268 a, low, high); 3269 a -= low; 3270 if (i == -1) /* no previous in range */ 3271 i = a; 3272 else { /* check that range is valid */ 3273 if (i > a) 3274 errx(EX_DATAERR, "invalid range %d-%d", 3275 i+low, a+low); 3276 if (*s == '-') 3277 errx(EX_DATAERR, "double '-' in range"); 3278 } 3279 for (; i <= a; i++) 3280 map[i/32] |= 1<<(i & 31); 3281 i = -1; 3282 if (*s == '-') 3283 i = a; 3284 else if (*s == '}') 3285 break; 3286 av = s+1; 3287 } 3288 return; 3289 } 3290 av = p; 3291 if (av) /* then *av must be a ',' */ 3292 av++; 3293 3294 /* Check this entry */ 3295 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 3296 /* 3297 * 'any' turns the entire list into a NOP. 3298 * 'not any' never matches, so it is removed from the 3299 * list unless it is the only item, in which case we 3300 * report an error. 3301 */ 3302 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 3303 if (av == NULL && len == 0) /* only this entry */ 3304 errx(EX_DATAERR, "not any never matches"); 3305 } 3306 /* else do nothing and skip this entry */ 3307 return; 3308 } 3309 /* A single IP can be stored in an optimized format */ 3310 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 3311 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 3312 return; 3313 } 3314 len += 2; /* two words... */ 3315 d += 2; 3316 } /* end while */ 3317 if (len + 1 > F_LEN_MASK) 3318 errx(EX_DATAERR, "address list too long"); 3319 cmd->o.len |= len+1; 3320 } 3321 3322 3323 /* n2mask sets n bits of the mask */ 3324 void 3325 n2mask(struct in6_addr *mask, int n) 3326 { 3327 static int minimask[9] = 3328 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 3329 u_char *p; 3330 3331 memset(mask, 0, sizeof(struct in6_addr)); 3332 p = (u_char *) mask; 3333 for (; n > 0; p++, n -= 8) { 3334 if (n >= 8) 3335 *p = 0xff; 3336 else 3337 *p = minimask[n]; 3338 } 3339 return; 3340 } 3341 3342 static void 3343 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 3344 struct _s_x *flags, char *p) 3345 { 3346 char *e; 3347 uint32_t set = 0, clear = 0; 3348 3349 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3350 errx(EX_DATAERR, "invalid flag %s", e); 3351 3352 cmd->opcode = opcode; 3353 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3354 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3355 } 3356 3357 3358 void 3359 ipfw_delete(char *av[]) 3360 { 3361 ipfw_range_tlv rt; 3362 char *sep; 3363 int i, j; 3364 int exitval = EX_OK; 3365 int do_set = 0; 3366 3367 av++; 3368 NEED1("missing rule specification"); 3369 if ( *av && _substrcmp(*av, "set") == 0) { 3370 /* Do not allow using the following syntax: 3371 * ipfw set N delete set M 3372 */ 3373 if (g_co.use_set) 3374 errx(EX_DATAERR, "invalid syntax"); 3375 do_set = 1; /* delete set */ 3376 av++; 3377 } 3378 3379 /* Rule number */ 3380 while (*av && isdigit(**av)) { 3381 i = strtol(*av, &sep, 10); 3382 j = i; 3383 if (*sep== '-') 3384 j = strtol(sep + 1, NULL, 10); 3385 av++; 3386 if (g_co.do_nat) { 3387 exitval = ipfw_delete_nat(i); 3388 } else if (g_co.do_pipe) { 3389 exitval = ipfw_delete_pipe(g_co.do_pipe, i); 3390 } else { 3391 memset(&rt, 0, sizeof(rt)); 3392 if (do_set != 0) { 3393 rt.set = i & 31; 3394 rt.flags = IPFW_RCFLAG_SET; 3395 } else { 3396 rt.start_rule = i & 0xffff; 3397 rt.end_rule = j & 0xffff; 3398 if (rt.start_rule == 0 && rt.end_rule == 0) 3399 rt.flags |= IPFW_RCFLAG_ALL; 3400 else 3401 rt.flags |= IPFW_RCFLAG_RANGE; 3402 if (g_co.use_set != 0) { 3403 rt.set = g_co.use_set - 1; 3404 rt.flags |= IPFW_RCFLAG_SET; 3405 } 3406 } 3407 if (g_co.do_dynamic == 2) 3408 rt.flags |= IPFW_RCFLAG_DYNAMIC; 3409 i = do_range_cmd(IP_FW_XDEL, &rt); 3410 if (i != 0) { 3411 exitval = EX_UNAVAILABLE; 3412 if (g_co.do_quiet) 3413 continue; 3414 warn("rule %u: setsockopt(IP_FW_XDEL)", 3415 rt.start_rule); 3416 } else if (rt.new_set == 0 && do_set == 0 && 3417 g_co.do_dynamic != 2) { 3418 exitval = EX_UNAVAILABLE; 3419 if (g_co.do_quiet) 3420 continue; 3421 if (rt.start_rule != rt.end_rule) 3422 warnx("no rules rules in %u-%u range", 3423 rt.start_rule, rt.end_rule); 3424 else 3425 warnx("rule %u not found", 3426 rt.start_rule); 3427 } 3428 } 3429 } 3430 if (exitval != EX_OK && g_co.do_force == 0) 3431 exit(exitval); 3432 } 3433 3434 3435 /* 3436 * fill the interface structure. We do not check the name as we can 3437 * create interfaces dynamically, so checking them at insert time 3438 * makes relatively little sense. 3439 * Interface names containing '*', '?', or '[' are assumed to be shell 3440 * patterns which match interfaces. 3441 */ 3442 static void 3443 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3444 { 3445 char *p; 3446 uint16_t uidx; 3447 3448 cmd->name[0] = '\0'; 3449 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3450 3451 CHECK_CMDLEN; 3452 3453 /* Parse the interface or address */ 3454 if (strcmp(arg, "any") == 0) 3455 cmd->o.len = 0; /* effectively ignore this command */ 3456 else if (strncmp(arg, "table(", 6) == 0) { 3457 if ((p = strchr(arg + 6, ')')) == NULL) 3458 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3459 *p = '\0'; 3460 p = strchr(arg + 6, ','); 3461 if (p) 3462 *p++ = '\0'; 3463 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3464 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3465 3466 cmd->name[0] = '\1'; /* Special value indicating table */ 3467 cmd->p.kidx = uidx; 3468 } else if (!isdigit(*arg)) { 3469 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3470 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3471 } else if (!inet_aton(arg, &cmd->p.ip)) 3472 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3473 } 3474 3475 static void 3476 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3477 { 3478 int i; 3479 size_t l; 3480 char *ap, *ptr, *optr; 3481 struct ether_addr *mac; 3482 const char *macset = "0123456789abcdefABCDEF:"; 3483 3484 if (strcmp(p, "any") == 0) { 3485 for (i = 0; i < ETHER_ADDR_LEN; i++) 3486 addr[i] = mask[i] = 0; 3487 return; 3488 } 3489 3490 optr = ptr = strdup(p); 3491 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3492 l = strlen(ap); 3493 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3494 errx(EX_DATAERR, "Incorrect MAC address"); 3495 bcopy(mac, addr, ETHER_ADDR_LEN); 3496 } else 3497 errx(EX_DATAERR, "Incorrect MAC address"); 3498 3499 if (ptr != NULL) { /* we have mask? */ 3500 if (p[ptr - optr - 1] == '/') { /* mask len */ 3501 long ml = strtol(ptr, &ap, 10); 3502 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3503 errx(EX_DATAERR, "Incorrect mask length"); 3504 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3505 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3506 } else { /* mask */ 3507 l = strlen(ptr); 3508 if (strspn(ptr, macset) != l || 3509 (mac = ether_aton(ptr)) == NULL) 3510 errx(EX_DATAERR, "Incorrect mask"); 3511 bcopy(mac, mask, ETHER_ADDR_LEN); 3512 } 3513 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3514 for (i = 0; i < ETHER_ADDR_LEN; i++) 3515 mask[i] = 0xff; 3516 } 3517 for (i = 0; i < ETHER_ADDR_LEN; i++) 3518 addr[i] &= mask[i]; 3519 3520 free(optr); 3521 } 3522 3523 /* 3524 * helper function, updates the pointer to cmd with the length 3525 * of the current command, and also cleans up the first word of 3526 * the new command in case it has been clobbered before. 3527 */ 3528 static ipfw_insn * 3529 next_cmd(ipfw_insn *cmd, int *len) 3530 { 3531 *len -= F_LEN(cmd); 3532 CHECK_LENGTH(*len, 0); 3533 cmd += F_LEN(cmd); 3534 bzero(cmd, sizeof(*cmd)); 3535 return cmd; 3536 } 3537 3538 /* 3539 * Takes arguments and copies them into a comment 3540 */ 3541 static void 3542 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3543 { 3544 int i, l; 3545 char *p = (char *)(cmd + 1); 3546 3547 cmd->opcode = O_NOP; 3548 cmd->len = (cmd->len & (F_NOT | F_OR)); 3549 3550 /* Compute length of comment string. */ 3551 for (i = 0, l = 0; av[i] != NULL; i++) 3552 l += strlen(av[i]) + 1; 3553 if (l == 0) 3554 return; 3555 if (l > 84) 3556 errx(EX_DATAERR, 3557 "comment too long (max 80 chars)"); 3558 l = 1 + (l+3)/4; 3559 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3560 CHECK_CMDLEN; 3561 3562 for (i = 0; av[i] != NULL; i++) { 3563 strcpy(p, av[i]); 3564 p += strlen(av[i]); 3565 *p++ = ' '; 3566 } 3567 *(--p) = '\0'; 3568 } 3569 3570 /* 3571 * A function to fill simple commands of size 1. 3572 * Existing flags are preserved. 3573 */ 3574 static void 3575 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3576 { 3577 cmd->opcode = opcode; 3578 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3579 cmd->arg1 = arg; 3580 } 3581 3582 /* 3583 * Fetch and add the MAC address and type, with masks. This generates one or 3584 * two microinstructions, and returns the pointer to the last one. 3585 */ 3586 static ipfw_insn * 3587 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3588 { 3589 ipfw_insn_mac *mac; 3590 3591 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3592 errx(EX_DATAERR, "MAC dst src"); 3593 3594 cmd->opcode = O_MACADDR2; 3595 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3596 CHECK_CMDLEN; 3597 3598 mac = (ipfw_insn_mac *)cmd; 3599 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3600 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3601 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3602 return cmd; 3603 } 3604 3605 static ipfw_insn * 3606 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3607 { 3608 if (!av) 3609 errx(EX_DATAERR, "missing MAC type"); 3610 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3611 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3612 cblen); 3613 cmd->opcode = O_MAC_TYPE; 3614 return cmd; 3615 } else 3616 return NULL; 3617 } 3618 3619 static ipfw_insn * 3620 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3621 { 3622 struct protoent *pe; 3623 char *ep; 3624 int proto; 3625 3626 proto = strtol(av, &ep, 10); 3627 if (*ep != '\0' || proto <= 0) { 3628 if ((pe = getprotobyname(av)) == NULL) 3629 return NULL; 3630 proto = pe->p_proto; 3631 } 3632 3633 fill_cmd(cmd, O_PROTO, 0, proto); 3634 *protop = proto; 3635 return cmd; 3636 } 3637 3638 static ipfw_insn * 3639 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3640 { 3641 u_char proto = IPPROTO_IP; 3642 3643 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3644 ; /* do not set O_IP4 nor O_IP6 */ 3645 else if (strcmp(av, "ip4") == 0) 3646 /* explicit "just IPv4" rule */ 3647 fill_cmd(cmd, O_IP4, 0, 0); 3648 else if (strcmp(av, "ip6") == 0) { 3649 /* explicit "just IPv6" rule */ 3650 proto = IPPROTO_IPV6; 3651 fill_cmd(cmd, O_IP6, 0, 0); 3652 } else 3653 return add_proto0(cmd, av, protop); 3654 3655 *protop = proto; 3656 return cmd; 3657 } 3658 3659 static ipfw_insn * 3660 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3661 { 3662 u_char proto = IPPROTO_IP; 3663 3664 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3665 ; /* do not set O_IP4 nor O_IP6 */ 3666 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3667 /* explicit "just IPv4" rule */ 3668 fill_cmd(cmd, O_IP4, 0, 0); 3669 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3670 /* explicit "just IPv6" rule */ 3671 proto = IPPROTO_IPV6; 3672 fill_cmd(cmd, O_IP6, 0, 0); 3673 } else 3674 return add_proto0(cmd, av, protop); 3675 3676 *protop = proto; 3677 return cmd; 3678 } 3679 3680 static ipfw_insn * 3681 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3682 { 3683 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3684 if (cmd->opcode == O_IP_DST_SET) /* set */ 3685 cmd->opcode = O_IP_SRC_SET; 3686 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3687 cmd->opcode = O_IP_SRC_LOOKUP; 3688 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3689 cmd->opcode = O_IP_SRC_ME; 3690 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3691 cmd->opcode = O_IP_SRC; 3692 else /* addr/mask */ 3693 cmd->opcode = O_IP_SRC_MASK; 3694 return cmd; 3695 } 3696 3697 static ipfw_insn * 3698 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3699 { 3700 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3701 if (cmd->opcode == O_IP_DST_SET) /* set */ 3702 ; 3703 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3704 ; 3705 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3706 cmd->opcode = O_IP_DST_ME; 3707 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3708 cmd->opcode = O_IP_DST; 3709 else /* addr/mask */ 3710 cmd->opcode = O_IP_DST_MASK; 3711 return cmd; 3712 } 3713 3714 static ipfw_insn * 3715 add_srcmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3716 { 3717 3718 if (strncmp(av, "table(", 6) == 0) 3719 fill_table(cmd, av, O_MAC_SRC_LOOKUP, tstate); 3720 else 3721 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3722 return cmd; 3723 } 3724 3725 static ipfw_insn * 3726 add_dstmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3727 { 3728 3729 if (strncmp(av, "table(", 6) == 0) 3730 fill_table(cmd, av, O_MAC_DST_LOOKUP, tstate); 3731 else 3732 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3733 return cmd; 3734 } 3735 3736 3737 static struct _s_x f_reserved_keywords[] = { 3738 { "altq", TOK_OR }, 3739 { "//", TOK_OR }, 3740 { "diverted", TOK_OR }, 3741 { "dst-port", TOK_OR }, 3742 { "src-port", TOK_OR }, 3743 { "established", TOK_OR }, 3744 { "keep-state", TOK_OR }, 3745 { "frag", TOK_OR }, 3746 { "icmptypes", TOK_OR }, 3747 { "in", TOK_OR }, 3748 { "out", TOK_OR }, 3749 { "ip6", TOK_OR }, 3750 { "any", TOK_OR }, 3751 { "to", TOK_OR }, 3752 { "via", TOK_OR }, 3753 { "{", TOK_OR }, 3754 { NULL, 0 } /* terminator */ 3755 }; 3756 3757 static ipfw_insn * 3758 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3759 { 3760 3761 if (match_token(f_reserved_keywords, av) != -1) 3762 return (NULL); 3763 3764 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3765 /* XXX todo: check that we have a protocol with ports */ 3766 cmd->opcode = opcode; 3767 return cmd; 3768 } 3769 return NULL; 3770 } 3771 3772 static ipfw_insn * 3773 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3774 { 3775 struct in6_addr a; 3776 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3777 ipfw_insn *ret = NULL; 3778 size_t len; 3779 3780 /* Copy first address in set if needed */ 3781 if ((ch = strpbrk(av, "/,")) != NULL) { 3782 len = ch - av; 3783 strlcpy(buf, av, sizeof(buf)); 3784 if (len < sizeof(buf)) 3785 buf[len] = '\0'; 3786 host = buf; 3787 } else 3788 host = av; 3789 3790 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3791 inet_pton(AF_INET6, host, &a) == 1) 3792 ret = add_srcip6(cmd, av, cblen, tstate); 3793 /* XXX: should check for IPv4, not !IPv6 */ 3794 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3795 inet_pton(AF_INET6, host, &a) != 1)) 3796 ret = add_srcip(cmd, av, cblen, tstate); 3797 if (ret == NULL && strcmp(av, "any") != 0) 3798 ret = cmd; 3799 3800 return ret; 3801 } 3802 3803 static ipfw_insn * 3804 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3805 { 3806 struct in6_addr a; 3807 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3808 ipfw_insn *ret = NULL; 3809 size_t len; 3810 3811 /* Copy first address in set if needed */ 3812 if ((ch = strpbrk(av, "/,")) != NULL) { 3813 len = ch - av; 3814 strlcpy(buf, av, sizeof(buf)); 3815 if (len < sizeof(buf)) 3816 buf[len] = '\0'; 3817 host = buf; 3818 } else 3819 host = av; 3820 3821 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3822 inet_pton(AF_INET6, host, &a) == 1) 3823 ret = add_dstip6(cmd, av, cblen, tstate); 3824 /* XXX: should check for IPv4, not !IPv6 */ 3825 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3826 inet_pton(AF_INET6, host, &a) != 1)) 3827 ret = add_dstip(cmd, av, cblen, tstate); 3828 if (ret == NULL && strcmp(av, "any") != 0) 3829 ret = cmd; 3830 3831 return ret; 3832 } 3833 3834 /* 3835 * Parse arguments and assemble the microinstructions which make up a rule. 3836 * Rules are added into the 'rulebuf' and then copied in the correct order 3837 * into the actual rule. 3838 * 3839 * The syntax for a rule starts with the action, followed by 3840 * optional action parameters, and the various match patterns. 3841 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 3842 * (generated if the rule includes a keep-state option), then the 3843 * various match patterns, log/altq actions, and the actual action. 3844 * 3845 */ 3846 static void 3847 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 3848 { 3849 /* 3850 * rules are added into the 'rulebuf' and then copied in 3851 * the correct order into the actual rule. 3852 * Some things that need to go out of order (prob, action etc.) 3853 * go into actbuf[]. 3854 */ 3855 static uint32_t actbuf[255], cmdbuf[255]; 3856 int rblen, ablen, cblen; 3857 3858 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 3859 ipfw_insn *first_cmd; /* first match pattern */ 3860 3861 struct ip_fw_rule *rule; 3862 3863 /* 3864 * various flags used to record that we entered some fields. 3865 */ 3866 ipfw_insn *have_state = NULL; /* any state-related option */ 3867 int have_rstate = 0; 3868 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 3869 ipfw_insn *have_skipcmd = NULL; 3870 size_t len; 3871 3872 int i; 3873 3874 int open_par = 0; /* open parenthesis ( */ 3875 3876 /* proto is here because it is used to fetch ports */ 3877 u_char proto = IPPROTO_IP; /* default protocol */ 3878 3879 double match_prob = 1; /* match probability, default is always match */ 3880 3881 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 3882 bzero(cmdbuf, sizeof(cmdbuf)); 3883 bzero(rbuf, *rbufsize); 3884 3885 rule = (struct ip_fw_rule *)rbuf; 3886 cmd = (ipfw_insn *)cmdbuf; 3887 action = (ipfw_insn *)actbuf; 3888 3889 rblen = *rbufsize / sizeof(uint32_t); 3890 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 3891 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 3892 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 3893 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 3894 3895 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 3896 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 3897 3898 av++; 3899 3900 /* [rule N] -- Rule number optional */ 3901 if (av[0] && isdigit(**av)) { 3902 rule->rulenum = atoi(*av); 3903 av++; 3904 } 3905 3906 /* [set N] -- set number (0..RESVD_SET), optional */ 3907 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 3908 int set = strtoul(av[1], NULL, 10); 3909 if (set < 0 || set > RESVD_SET) 3910 errx(EX_DATAERR, "illegal set %s", av[1]); 3911 rule->set = set; 3912 tstate->set = set; 3913 av += 2; 3914 } 3915 3916 /* [prob D] -- match probability, optional */ 3917 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 3918 match_prob = strtod(av[1], NULL); 3919 3920 if (match_prob <= 0 || match_prob > 1) 3921 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 3922 av += 2; 3923 } 3924 3925 /* action -- mandatory */ 3926 NEED1("missing action"); 3927 i = match_token(rule_actions, *av); 3928 av++; 3929 action->len = 1; /* default */ 3930 CHECK_ACTLEN; 3931 switch(i) { 3932 case TOK_CHECKSTATE: 3933 have_state = action; 3934 action->opcode = O_CHECK_STATE; 3935 if (*av == NULL || 3936 match_token(rule_options, *av) == TOK_COMMENT) { 3937 action->arg1 = pack_object(tstate, 3938 default_state_name, IPFW_TLV_STATE_NAME); 3939 break; 3940 } 3941 if (*av[0] == ':') { 3942 if (strcmp(*av + 1, "any") == 0) 3943 action->arg1 = 0; 3944 else if (state_check_name(*av + 1) == 0) 3945 action->arg1 = pack_object(tstate, *av + 1, 3946 IPFW_TLV_STATE_NAME); 3947 else 3948 errx(EX_DATAERR, "Invalid state name %s", 3949 *av); 3950 av++; 3951 break; 3952 } 3953 errx(EX_DATAERR, "Invalid state name %s", *av); 3954 break; 3955 3956 case TOK_ABORT: 3957 action->opcode = O_REJECT; 3958 action->arg1 = ICMP_REJECT_ABORT; 3959 break; 3960 3961 case TOK_ABORT6: 3962 action->opcode = O_UNREACH6; 3963 action->arg1 = ICMP6_UNREACH_ABORT; 3964 break; 3965 3966 case TOK_ACCEPT: 3967 action->opcode = O_ACCEPT; 3968 break; 3969 3970 case TOK_DENY: 3971 action->opcode = O_DENY; 3972 action->arg1 = 0; 3973 break; 3974 3975 case TOK_REJECT: 3976 action->opcode = O_REJECT; 3977 action->arg1 = ICMP_UNREACH_HOST; 3978 break; 3979 3980 case TOK_RESET: 3981 action->opcode = O_REJECT; 3982 action->arg1 = ICMP_REJECT_RST; 3983 break; 3984 3985 case TOK_RESET6: 3986 action->opcode = O_UNREACH6; 3987 action->arg1 = ICMP6_UNREACH_RST; 3988 break; 3989 3990 case TOK_UNREACH: 3991 action->opcode = O_REJECT; 3992 NEED1("missing reject code"); 3993 fill_reject_code(&action->arg1, *av); 3994 av++; 3995 break; 3996 3997 case TOK_UNREACH6: 3998 action->opcode = O_UNREACH6; 3999 NEED1("missing unreach code"); 4000 fill_unreach6_code(&action->arg1, *av); 4001 av++; 4002 break; 4003 4004 case TOK_COUNT: 4005 action->opcode = O_COUNT; 4006 break; 4007 4008 case TOK_NAT: 4009 action->opcode = O_NAT; 4010 action->len = F_INSN_SIZE(ipfw_insn_nat); 4011 CHECK_ACTLEN; 4012 if (*av != NULL && _substrcmp(*av, "global") == 0) { 4013 action->arg1 = IP_FW_NAT44_GLOBAL; 4014 av++; 4015 break; 4016 } else 4017 goto chkarg; 4018 case TOK_QUEUE: 4019 action->opcode = O_QUEUE; 4020 goto chkarg; 4021 case TOK_PIPE: 4022 action->opcode = O_PIPE; 4023 goto chkarg; 4024 case TOK_SKIPTO: 4025 action->opcode = O_SKIPTO; 4026 goto chkarg; 4027 case TOK_NETGRAPH: 4028 action->opcode = O_NETGRAPH; 4029 goto chkarg; 4030 case TOK_NGTEE: 4031 action->opcode = O_NGTEE; 4032 goto chkarg; 4033 case TOK_DIVERT: 4034 action->opcode = O_DIVERT; 4035 goto chkarg; 4036 case TOK_TEE: 4037 action->opcode = O_TEE; 4038 goto chkarg; 4039 case TOK_CALL: 4040 action->opcode = O_CALLRETURN; 4041 chkarg: 4042 if (!av[0]) 4043 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 4044 if (isdigit(**av)) { 4045 action->arg1 = strtoul(*av, NULL, 10); 4046 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 4047 errx(EX_DATAERR, "illegal argument for %s", 4048 *(av - 1)); 4049 } else if (_substrcmp(*av, "tablearg") == 0) { 4050 action->arg1 = IP_FW_TARG; 4051 } else if (i == TOK_DIVERT || i == TOK_TEE) { 4052 struct servent *s; 4053 setservent(1); 4054 s = getservbyname(av[0], "divert"); 4055 if (s != NULL) 4056 action->arg1 = ntohs(s->s_port); 4057 else 4058 errx(EX_DATAERR, "illegal divert/tee port"); 4059 } else 4060 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 4061 av++; 4062 break; 4063 4064 case TOK_FORWARD: { 4065 /* 4066 * Locate the address-port separator (':' or ','). 4067 * Could be one of the following: 4068 * hostname:port 4069 * IPv4 a.b.c.d,port 4070 * IPv4 a.b.c.d:port 4071 * IPv6 w:x:y::z,port 4072 * IPv6 [w:x:y::z]:port 4073 */ 4074 struct sockaddr_storage result; 4075 struct addrinfo *res; 4076 char *s, *end; 4077 int family; 4078 u_short port_number = 0; 4079 4080 NEED1("missing forward address[:port]"); 4081 4082 if (strncmp(*av, "tablearg", 8) == 0 && 4083 ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':')) 4084 memcpy(++(*av), "0.0.0.0", 7); 4085 4086 /* 4087 * Are we an bracket-enclosed IPv6 address? 4088 */ 4089 if (strchr(*av, '[')) 4090 (*av)++; 4091 4092 /* 4093 * locate the address-port separator (':' or ',') 4094 */ 4095 s = strchr(*av, ','); 4096 if (s == NULL) { 4097 s = strchr(*av, ']'); 4098 /* Prevent erroneous parsing on brackets. */ 4099 if (s != NULL) 4100 *(s++) = '\0'; 4101 else 4102 s = *av; 4103 4104 /* Distinguish between IPv4:port and IPv6 cases. */ 4105 s = strchr(s, ':'); 4106 if (s && strchr(s+1, ':')) 4107 s = NULL; /* no port */ 4108 } 4109 4110 if (s != NULL) { 4111 /* Terminate host portion and set s to start of port. */ 4112 *(s++) = '\0'; 4113 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 4114 if (s == end) 4115 errx(EX_DATAERR, 4116 "illegal forwarding port ``%s''", s); 4117 port_number = (u_short)i; 4118 } 4119 4120 /* 4121 * Resolve the host name or address to a family and a 4122 * network representation of the address. 4123 */ 4124 if (getaddrinfo(*av, NULL, NULL, &res)) 4125 errx(EX_DATAERR, NULL); 4126 /* Just use the first host in the answer. */ 4127 family = res->ai_family; 4128 memcpy(&result, res->ai_addr, res->ai_addrlen); 4129 freeaddrinfo(res); 4130 4131 if (family == PF_INET) { 4132 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 4133 4134 action->opcode = O_FORWARD_IP; 4135 action->len = F_INSN_SIZE(ipfw_insn_sa); 4136 CHECK_ACTLEN; 4137 4138 /* 4139 * In the kernel we assume AF_INET and use only 4140 * sin_port and sin_addr. Remember to set sin_len as 4141 * the routing code seems to use it too. 4142 */ 4143 p->sa.sin_len = sizeof(struct sockaddr_in); 4144 p->sa.sin_family = AF_INET; 4145 p->sa.sin_port = port_number; 4146 p->sa.sin_addr.s_addr = 4147 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 4148 } else if (family == PF_INET6) { 4149 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 4150 4151 action->opcode = O_FORWARD_IP6; 4152 action->len = F_INSN_SIZE(ipfw_insn_sa6); 4153 CHECK_ACTLEN; 4154 4155 p->sa.sin6_len = sizeof(struct sockaddr_in6); 4156 p->sa.sin6_family = AF_INET6; 4157 p->sa.sin6_port = port_number; 4158 p->sa.sin6_flowinfo = 0; 4159 p->sa.sin6_scope_id = 4160 ((struct sockaddr_in6 *)&result)->sin6_scope_id; 4161 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 4162 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 4163 } else { 4164 errx(EX_DATAERR, "Invalid address family in forward action"); 4165 } 4166 av++; 4167 break; 4168 } 4169 case TOK_COMMENT: 4170 /* pretend it is a 'count' rule followed by the comment */ 4171 action->opcode = O_COUNT; 4172 av--; /* go back... */ 4173 break; 4174 4175 case TOK_SETFIB: 4176 { 4177 int numfibs; 4178 size_t intsize = sizeof(int); 4179 4180 action->opcode = O_SETFIB; 4181 NEED1("missing fib number"); 4182 if (_substrcmp(*av, "tablearg") == 0) { 4183 action->arg1 = IP_FW_TARG; 4184 } else { 4185 action->arg1 = strtoul(*av, NULL, 10); 4186 if (sysctlbyname("net.fibs", &numfibs, &intsize, 4187 NULL, 0) == -1) 4188 errx(EX_DATAERR, "fibs not supported.\n"); 4189 if (action->arg1 >= numfibs) /* Temporary */ 4190 errx(EX_DATAERR, "fib too large.\n"); 4191 /* Add high-order bit to fib to make room for tablearg*/ 4192 action->arg1 |= 0x8000; 4193 } 4194 av++; 4195 break; 4196 } 4197 4198 case TOK_SETDSCP: 4199 { 4200 int code; 4201 4202 action->opcode = O_SETDSCP; 4203 NEED1("missing DSCP code"); 4204 if (_substrcmp(*av, "tablearg") == 0) { 4205 action->arg1 = IP_FW_TARG; 4206 } else { 4207 if (isalpha(*av[0])) { 4208 if ((code = match_token(f_ipdscp, *av)) == -1) 4209 errx(EX_DATAERR, "Unknown DSCP code"); 4210 action->arg1 = code; 4211 } else 4212 action->arg1 = strtoul(*av, NULL, 10); 4213 /* 4214 * Add high-order bit to DSCP to make room 4215 * for tablearg 4216 */ 4217 action->arg1 |= 0x8000; 4218 } 4219 av++; 4220 break; 4221 } 4222 4223 case TOK_REASS: 4224 action->opcode = O_REASS; 4225 break; 4226 4227 case TOK_RETURN: 4228 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 4229 break; 4230 4231 case TOK_TCPSETMSS: { 4232 u_long mss; 4233 uint16_t idx; 4234 4235 idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION); 4236 if (idx == 0) 4237 errx(EX_DATAERR, "pack_object failed"); 4238 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4239 NEED1("Missing MSS value"); 4240 action = next_cmd(action, &ablen); 4241 action->len = 1; 4242 CHECK_ACTLEN; 4243 mss = strtoul(*av, NULL, 10); 4244 if (mss == 0 || mss > UINT16_MAX) 4245 errx(EX_USAGE, "invalid MSS value %s", *av); 4246 fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss); 4247 av++; 4248 break; 4249 } 4250 4251 default: 4252 av--; 4253 if (match_token(rule_eactions, *av) == -1) 4254 errx(EX_DATAERR, "invalid action %s\n", *av); 4255 /* 4256 * External actions support. 4257 * XXX: we support only syntax with instance name. 4258 * For known external actions (from rule_eactions list) 4259 * we can handle syntax directly. But with `eaction' 4260 * keyword we can use only `eaction <name> <instance>' 4261 * syntax. 4262 */ 4263 case TOK_EACTION: { 4264 uint16_t idx; 4265 4266 NEED1("Missing eaction name"); 4267 if (eaction_check_name(*av) != 0) 4268 errx(EX_DATAERR, "Invalid eaction name %s", *av); 4269 idx = pack_object(tstate, *av, IPFW_TLV_EACTION); 4270 if (idx == 0) 4271 errx(EX_DATAERR, "pack_object failed"); 4272 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4273 av++; 4274 NEED1("Missing eaction instance name"); 4275 action = next_cmd(action, &ablen); 4276 action->len = 1; 4277 CHECK_ACTLEN; 4278 if (eaction_check_name(*av) != 0) 4279 errx(EX_DATAERR, "Invalid eaction instance name %s", 4280 *av); 4281 /* 4282 * External action instance object has TLV type depended 4283 * from the external action name object index. Since we 4284 * currently don't know this index, use zero as TLV type. 4285 */ 4286 idx = pack_object(tstate, *av, 0); 4287 if (idx == 0) 4288 errx(EX_DATAERR, "pack_object failed"); 4289 fill_cmd(action, O_EXTERNAL_INSTANCE, 0, idx); 4290 av++; 4291 } 4292 } 4293 action = next_cmd(action, &ablen); 4294 4295 /* 4296 * [altq queuename] -- altq tag, optional 4297 * [log [logamount N]] -- log, optional 4298 * 4299 * If they exist, it go first in the cmdbuf, but then it is 4300 * skipped in the copy section to the end of the buffer. 4301 */ 4302 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 4303 av++; 4304 switch (i) { 4305 case TOK_LOG: 4306 { 4307 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 4308 int l; 4309 4310 if (have_log) 4311 errx(EX_DATAERR, 4312 "log cannot be specified more than once"); 4313 have_log = (ipfw_insn *)c; 4314 cmd->len = F_INSN_SIZE(ipfw_insn_log); 4315 CHECK_CMDLEN; 4316 cmd->opcode = O_LOG; 4317 if (av[0] && _substrcmp(*av, "logamount") == 0) { 4318 av++; 4319 NEED1("logamount requires argument"); 4320 l = atoi(*av); 4321 if (l < 0) 4322 errx(EX_DATAERR, 4323 "logamount must be positive"); 4324 c->max_log = l; 4325 av++; 4326 } else { 4327 len = sizeof(c->max_log); 4328 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 4329 &c->max_log, &len, NULL, 0) == -1) { 4330 if (g_co.test_only) { 4331 c->max_log = 0; 4332 break; 4333 } 4334 errx(1, "sysctlbyname(\"%s\")", 4335 "net.inet.ip.fw.verbose_limit"); 4336 } 4337 } 4338 } 4339 break; 4340 4341 #ifndef NO_ALTQ 4342 case TOK_ALTQ: 4343 { 4344 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 4345 4346 NEED1("missing altq queue name"); 4347 if (have_altq) 4348 errx(EX_DATAERR, 4349 "altq cannot be specified more than once"); 4350 have_altq = (ipfw_insn *)a; 4351 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 4352 CHECK_CMDLEN; 4353 cmd->opcode = O_ALTQ; 4354 a->qid = altq_name_to_qid(*av); 4355 av++; 4356 } 4357 break; 4358 #endif 4359 4360 case TOK_TAG: 4361 case TOK_UNTAG: { 4362 uint16_t tag; 4363 4364 if (have_tag) 4365 errx(EX_USAGE, "tag and untag cannot be " 4366 "specified more than once"); 4367 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 4368 rule_action_params); 4369 have_tag = cmd; 4370 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 4371 av++; 4372 break; 4373 } 4374 4375 default: 4376 abort(); 4377 } 4378 cmd = next_cmd(cmd, &cblen); 4379 } 4380 4381 if (have_state) { /* must be a check-state, we are done */ 4382 if (*av != NULL && 4383 match_token(rule_options, *av) == TOK_COMMENT) { 4384 /* check-state has a comment */ 4385 av++; 4386 fill_comment(cmd, av, cblen); 4387 cmd = next_cmd(cmd, &cblen); 4388 av[0] = NULL; 4389 } 4390 goto done; 4391 } 4392 4393 #define OR_START(target) \ 4394 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 4395 if (open_par) \ 4396 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 4397 prev = NULL; \ 4398 open_par = 1; \ 4399 if ( (av[0])[1] == '\0') { \ 4400 av++; \ 4401 } else \ 4402 (*av)++; \ 4403 } \ 4404 target: \ 4405 4406 4407 #define CLOSE_PAR \ 4408 if (open_par) { \ 4409 if (av[0] && ( \ 4410 strcmp(*av, ")") == 0 || \ 4411 strcmp(*av, "}") == 0)) { \ 4412 prev = NULL; \ 4413 open_par = 0; \ 4414 av++; \ 4415 } else \ 4416 errx(EX_USAGE, "missing \")\"\n"); \ 4417 } 4418 4419 #define NOT_BLOCK \ 4420 if (av[0] && _substrcmp(*av, "not") == 0) { \ 4421 if (cmd->len & F_NOT) \ 4422 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 4423 cmd->len |= F_NOT; \ 4424 av++; \ 4425 } 4426 4427 #define OR_BLOCK(target) \ 4428 if (av[0] && _substrcmp(*av, "or") == 0) { \ 4429 if (prev == NULL || open_par == 0) \ 4430 errx(EX_DATAERR, "invalid OR block"); \ 4431 prev->len |= F_OR; \ 4432 av++; \ 4433 goto target; \ 4434 } \ 4435 CLOSE_PAR; 4436 4437 first_cmd = cmd; 4438 4439 #if 0 4440 /* 4441 * MAC addresses, optional. 4442 * If we have this, we skip the part "proto from src to dst" 4443 * and jump straight to the option parsing. 4444 */ 4445 NOT_BLOCK; 4446 NEED1("missing protocol"); 4447 if (_substrcmp(*av, "MAC") == 0 || 4448 _substrcmp(*av, "mac") == 0) { 4449 av++; /* the "MAC" keyword */ 4450 add_mac(cmd, av); /* exits in case of errors */ 4451 cmd = next_cmd(cmd); 4452 av += 2; /* dst-mac and src-mac */ 4453 NOT_BLOCK; 4454 NEED1("missing mac type"); 4455 if (add_mactype(cmd, av[0])) 4456 cmd = next_cmd(cmd); 4457 av++; /* any or mac-type */ 4458 goto read_options; 4459 } 4460 #endif 4461 4462 /* 4463 * protocol, mandatory 4464 */ 4465 OR_START(get_proto); 4466 NOT_BLOCK; 4467 NEED1("missing protocol"); 4468 if (add_proto_compat(cmd, *av, &proto)) { 4469 av++; 4470 if (F_LEN(cmd) != 0) { 4471 prev = cmd; 4472 cmd = next_cmd(cmd, &cblen); 4473 } 4474 } else if (first_cmd != cmd) { 4475 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 4476 } else { 4477 rule->flags |= IPFW_RULE_JUSTOPTS; 4478 goto read_options; 4479 } 4480 OR_BLOCK(get_proto); 4481 4482 first_cmd = cmd; /* update pointer to use in compact form */ 4483 4484 /* 4485 * "from", mandatory 4486 */ 4487 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 4488 errx(EX_USAGE, "missing ``from''"); 4489 av++; 4490 4491 /* 4492 * source IP, mandatory 4493 */ 4494 OR_START(source_ip); 4495 NOT_BLOCK; /* optional "not" */ 4496 NEED1("missing source address"); 4497 if (add_src(cmd, *av, proto, cblen, tstate)) { 4498 av++; 4499 if (F_LEN(cmd) != 0) { /* ! any */ 4500 prev = cmd; 4501 cmd = next_cmd(cmd, &cblen); 4502 } 4503 } else 4504 errx(EX_USAGE, "bad source address %s", *av); 4505 OR_BLOCK(source_ip); 4506 4507 /* 4508 * source ports, optional 4509 */ 4510 NOT_BLOCK; /* optional "not" */ 4511 if ( av[0] != NULL ) { 4512 if (_substrcmp(*av, "any") == 0 || 4513 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4514 av++; 4515 if (F_LEN(cmd) != 0) 4516 cmd = next_cmd(cmd, &cblen); 4517 } 4518 } 4519 4520 /* 4521 * "to", mandatory 4522 */ 4523 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4524 errx(EX_USAGE, "missing ``to''"); 4525 av++; 4526 4527 /* 4528 * destination, mandatory 4529 */ 4530 OR_START(dest_ip); 4531 NOT_BLOCK; /* optional "not" */ 4532 NEED1("missing dst address"); 4533 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4534 av++; 4535 if (F_LEN(cmd) != 0) { /* ! any */ 4536 prev = cmd; 4537 cmd = next_cmd(cmd, &cblen); 4538 } 4539 } else 4540 errx( EX_USAGE, "bad destination address %s", *av); 4541 OR_BLOCK(dest_ip); 4542 4543 /* 4544 * dest. ports, optional 4545 */ 4546 NOT_BLOCK; /* optional "not" */ 4547 if (av[0]) { 4548 if (_substrcmp(*av, "any") == 0 || 4549 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4550 av++; 4551 if (F_LEN(cmd) != 0) 4552 cmd = next_cmd(cmd, &cblen); 4553 } 4554 } 4555 if (first_cmd == cmd) 4556 rule->flags |= IPFW_RULE_NOOPT; 4557 4558 read_options: 4559 prev = NULL; 4560 while ( av[0] != NULL ) { 4561 char *s; 4562 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4563 4564 s = *av; 4565 cmd32 = (ipfw_insn_u32 *)cmd; 4566 4567 if (*s == '!') { /* alternate syntax for NOT */ 4568 if (cmd->len & F_NOT) 4569 errx(EX_USAGE, "double \"not\" not allowed\n"); 4570 cmd->len = F_NOT; 4571 s++; 4572 } 4573 i = match_token(rule_options, s); 4574 av++; 4575 switch(i) { 4576 case TOK_NOT: 4577 if (cmd->len & F_NOT) 4578 errx(EX_USAGE, "double \"not\" not allowed\n"); 4579 cmd->len = F_NOT; 4580 break; 4581 4582 case TOK_OR: 4583 if (open_par == 0 || prev == NULL) 4584 errx(EX_USAGE, "invalid \"or\" block\n"); 4585 prev->len |= F_OR; 4586 break; 4587 4588 case TOK_STARTBRACE: 4589 if (open_par) 4590 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4591 open_par = 1; 4592 break; 4593 4594 case TOK_ENDBRACE: 4595 if (!open_par) 4596 errx(EX_USAGE, "+missing \")\"\n"); 4597 open_par = 0; 4598 prev = NULL; 4599 break; 4600 4601 case TOK_IN: 4602 fill_cmd(cmd, O_IN, 0, 0); 4603 break; 4604 4605 case TOK_OUT: 4606 cmd->len ^= F_NOT; /* toggle F_NOT */ 4607 fill_cmd(cmd, O_IN, 0, 0); 4608 break; 4609 4610 case TOK_DIVERTED: 4611 fill_cmd(cmd, O_DIVERTED, 0, 3); 4612 break; 4613 4614 case TOK_DIVERTEDLOOPBACK: 4615 fill_cmd(cmd, O_DIVERTED, 0, 1); 4616 break; 4617 4618 case TOK_DIVERTEDOUTPUT: 4619 fill_cmd(cmd, O_DIVERTED, 0, 2); 4620 break; 4621 4622 case TOK_FRAG: { 4623 uint32_t set = 0, clear = 0; 4624 4625 if (*av != NULL && fill_flags(f_ipoff, *av, NULL, 4626 &set, &clear) == 0) 4627 av++; 4628 else { 4629 /* 4630 * Compatibility: no argument after "frag" 4631 * keyword equals to "frag offset". 4632 */ 4633 set = 0x01; 4634 clear = 0; 4635 } 4636 fill_cmd(cmd, O_FRAG, 0, 4637 (set & 0xff) | ( (clear & 0xff) << 8)); 4638 break; 4639 } 4640 4641 case TOK_LAYER2: 4642 fill_cmd(cmd, O_LAYER2, 0, 0); 4643 break; 4644 4645 case TOK_XMIT: 4646 case TOK_RECV: 4647 case TOK_VIA: 4648 NEED1("recv, xmit, via require interface name" 4649 " or address"); 4650 fill_iface((ipfw_insn_if *)cmd, av[0], cblen, tstate); 4651 av++; 4652 if (F_LEN(cmd) == 0) /* not a valid address */ 4653 break; 4654 if (i == TOK_XMIT) 4655 cmd->opcode = O_XMIT; 4656 else if (i == TOK_RECV) 4657 cmd->opcode = O_RECV; 4658 else if (i == TOK_VIA) 4659 cmd->opcode = O_VIA; 4660 break; 4661 4662 case TOK_ICMPTYPES: 4663 NEED1("icmptypes requires list of types"); 4664 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 4665 av++; 4666 break; 4667 4668 case TOK_ICMP6TYPES: 4669 NEED1("icmptypes requires list of types"); 4670 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 4671 av++; 4672 break; 4673 4674 case TOK_IPTTL: 4675 NEED1("ipttl requires TTL"); 4676 if (strpbrk(*av, "-,")) { 4677 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 4678 errx(EX_DATAERR, "invalid ipttl %s", *av); 4679 } else 4680 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 4681 av++; 4682 break; 4683 4684 case TOK_IPID: 4685 NEED1("ipid requires id"); 4686 if (strpbrk(*av, "-,")) { 4687 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 4688 errx(EX_DATAERR, "invalid ipid %s", *av); 4689 } else 4690 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 4691 av++; 4692 break; 4693 4694 case TOK_IPLEN: 4695 NEED1("iplen requires length"); 4696 if (strpbrk(*av, "-,")) { 4697 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 4698 errx(EX_DATAERR, "invalid ip len %s", *av); 4699 } else 4700 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 4701 av++; 4702 break; 4703 4704 case TOK_IPVER: 4705 NEED1("ipver requires version"); 4706 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 4707 av++; 4708 break; 4709 4710 case TOK_IPPRECEDENCE: 4711 NEED1("ipprecedence requires value"); 4712 fill_cmd(cmd, O_IPPRECEDENCE, 0, 4713 (strtoul(*av, NULL, 0) & 7) << 5); 4714 av++; 4715 break; 4716 4717 case TOK_DSCP: 4718 NEED1("missing DSCP code"); 4719 fill_dscp(cmd, *av, cblen); 4720 av++; 4721 break; 4722 4723 case TOK_IPOPTS: 4724 NEED1("missing argument for ipoptions"); 4725 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 4726 av++; 4727 break; 4728 4729 case TOK_IPTOS: 4730 NEED1("missing argument for iptos"); 4731 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 4732 av++; 4733 break; 4734 4735 case TOK_UID: 4736 NEED1("uid requires argument"); 4737 { 4738 char *end; 4739 uid_t uid; 4740 struct passwd *pwd; 4741 4742 cmd->opcode = O_UID; 4743 uid = strtoul(*av, &end, 0); 4744 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 4745 if (pwd == NULL) 4746 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 4747 cmd32->d[0] = pwd->pw_uid; 4748 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4749 av++; 4750 } 4751 break; 4752 4753 case TOK_GID: 4754 NEED1("gid requires argument"); 4755 { 4756 char *end; 4757 gid_t gid; 4758 struct group *grp; 4759 4760 cmd->opcode = O_GID; 4761 gid = strtoul(*av, &end, 0); 4762 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 4763 if (grp == NULL) 4764 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 4765 cmd32->d[0] = grp->gr_gid; 4766 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4767 av++; 4768 } 4769 break; 4770 4771 case TOK_JAIL: 4772 NEED1("jail requires argument"); 4773 { 4774 char *end; 4775 int jid; 4776 4777 cmd->opcode = O_JAIL; 4778 /* 4779 * If av is a number, then we'll just pass it as-is. If 4780 * it's a name, try to resolve that to a jid. 4781 * 4782 * We save the jail_getid(3) call for a fallback because 4783 * it entails an unconditional trip to the kernel to 4784 * either validate a jid or resolve a name to a jid. 4785 * This specific token doesn't currently require a 4786 * jid to be an active jail, so we save a transition 4787 * by simply using a number that we're given. 4788 */ 4789 jid = strtoul(*av, &end, 10); 4790 if (*end != '\0') { 4791 jid = jail_getid(*av); 4792 if (jid < 0) 4793 errx(EX_DATAERR, "%s", jail_errmsg); 4794 } 4795 cmd32->d[0] = (uint32_t)jid; 4796 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4797 av++; 4798 } 4799 break; 4800 4801 case TOK_ESTAB: 4802 fill_cmd(cmd, O_ESTAB, 0, 0); 4803 break; 4804 4805 case TOK_SETUP: 4806 fill_cmd(cmd, O_TCPFLAGS, 0, 4807 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 4808 break; 4809 4810 case TOK_TCPDATALEN: 4811 NEED1("tcpdatalen requires length"); 4812 if (strpbrk(*av, "-,")) { 4813 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 4814 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 4815 } else 4816 fill_cmd(cmd, O_TCPDATALEN, 0, 4817 strtoul(*av, NULL, 0)); 4818 av++; 4819 break; 4820 4821 case TOK_TCPOPTS: 4822 NEED1("missing argument for tcpoptions"); 4823 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 4824 av++; 4825 break; 4826 4827 case TOK_TCPSEQ: 4828 case TOK_TCPACK: 4829 NEED1("tcpseq/tcpack requires argument"); 4830 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 4831 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 4832 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 4833 av++; 4834 break; 4835 4836 case TOK_TCPMSS: 4837 case TOK_TCPWIN: 4838 NEED1("tcpmss/tcpwin requires size"); 4839 if (strpbrk(*av, "-,")) { 4840 if (add_ports(cmd, *av, 0, 4841 i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS, 4842 cblen) == NULL) 4843 errx(EX_DATAERR, "invalid %s size %s", 4844 s, *av); 4845 } else 4846 fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN : 4847 O_TCPMSS, 0, strtoul(*av, NULL, 0)); 4848 av++; 4849 break; 4850 4851 case TOK_TCPFLAGS: 4852 NEED1("missing argument for tcpflags"); 4853 cmd->opcode = O_TCPFLAGS; 4854 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 4855 av++; 4856 break; 4857 4858 case TOK_KEEPSTATE: 4859 case TOK_RECORDSTATE: { 4860 uint16_t uidx; 4861 4862 if (open_par) 4863 errx(EX_USAGE, "keep-state or record-state cannot be part " 4864 "of an or block"); 4865 if (have_state) 4866 errx(EX_USAGE, "only one of keep-state, record-state, " 4867 " limit and set-limit is allowed"); 4868 if (*av != NULL && *av[0] == ':') { 4869 if (state_check_name(*av + 1) != 0) 4870 errx(EX_DATAERR, 4871 "Invalid state name %s", *av); 4872 uidx = pack_object(tstate, *av + 1, 4873 IPFW_TLV_STATE_NAME); 4874 av++; 4875 } else 4876 uidx = pack_object(tstate, default_state_name, 4877 IPFW_TLV_STATE_NAME); 4878 have_state = cmd; 4879 have_rstate = i == TOK_RECORDSTATE; 4880 fill_cmd(cmd, O_KEEP_STATE, 0, uidx); 4881 break; 4882 } 4883 4884 case TOK_LIMIT: 4885 case TOK_SETLIMIT: { 4886 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 4887 int val; 4888 4889 if (open_par) 4890 errx(EX_USAGE, 4891 "limit or set-limit cannot be part of an or block"); 4892 if (have_state) 4893 errx(EX_USAGE, "only one of keep-state, record-state, " 4894 " limit and set-limit is allowed"); 4895 have_state = cmd; 4896 have_rstate = i == TOK_SETLIMIT; 4897 4898 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 4899 CHECK_CMDLEN; 4900 cmd->opcode = O_LIMIT; 4901 c->limit_mask = c->conn_limit = 0; 4902 4903 while ( av[0] != NULL ) { 4904 if ((val = match_token(limit_masks, *av)) <= 0) 4905 break; 4906 c->limit_mask |= val; 4907 av++; 4908 } 4909 4910 if (c->limit_mask == 0) 4911 errx(EX_USAGE, "limit: missing limit mask"); 4912 4913 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 4914 TOK_LIMIT, rule_options); 4915 av++; 4916 4917 if (*av != NULL && *av[0] == ':') { 4918 if (state_check_name(*av + 1) != 0) 4919 errx(EX_DATAERR, 4920 "Invalid state name %s", *av); 4921 cmd->arg1 = pack_object(tstate, *av + 1, 4922 IPFW_TLV_STATE_NAME); 4923 av++; 4924 } else 4925 cmd->arg1 = pack_object(tstate, 4926 default_state_name, IPFW_TLV_STATE_NAME); 4927 break; 4928 } 4929 4930 case TOK_PROTO: 4931 NEED1("missing protocol"); 4932 if (add_proto(cmd, *av, &proto)) { 4933 av++; 4934 } else 4935 errx(EX_DATAERR, "invalid protocol ``%s''", 4936 *av); 4937 break; 4938 4939 case TOK_SRCIP: 4940 NEED1("missing source IP"); 4941 if (add_srcip(cmd, *av, cblen, tstate)) { 4942 av++; 4943 } 4944 break; 4945 4946 case TOK_DSTIP: 4947 NEED1("missing destination IP"); 4948 if (add_dstip(cmd, *av, cblen, tstate)) { 4949 av++; 4950 } 4951 break; 4952 4953 case TOK_SRCIP6: 4954 NEED1("missing source IP6"); 4955 if (add_srcip6(cmd, *av, cblen, tstate)) { 4956 av++; 4957 } 4958 break; 4959 4960 case TOK_DSTIP6: 4961 NEED1("missing destination IP6"); 4962 if (add_dstip6(cmd, *av, cblen, tstate)) { 4963 av++; 4964 } 4965 break; 4966 4967 4968 case TOK_SRCMAC: 4969 NEED1("missing source MAC"); 4970 if (add_srcmac(cmd, *av, tstate)) { 4971 av++; 4972 } 4973 break; 4974 4975 case TOK_DSTMAC: 4976 NEED1("missing destination MAC"); 4977 if (add_dstmac(cmd, *av, tstate)) { 4978 av++; 4979 } 4980 break; 4981 4982 case TOK_SRCPORT: 4983 NEED1("missing source port"); 4984 if (_substrcmp(*av, "any") == 0 || 4985 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4986 av++; 4987 } else 4988 errx(EX_DATAERR, "invalid source port %s", *av); 4989 break; 4990 4991 case TOK_DSTPORT: 4992 NEED1("missing destination port"); 4993 if (_substrcmp(*av, "any") == 0 || 4994 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4995 av++; 4996 } else 4997 errx(EX_DATAERR, "invalid destination port %s", 4998 *av); 4999 break; 5000 5001 case TOK_MAC: 5002 if (add_mac(cmd, av, cblen)) 5003 av += 2; 5004 break; 5005 5006 case TOK_MACTYPE: 5007 NEED1("missing mac type"); 5008 if (!add_mactype(cmd, *av, cblen)) 5009 errx(EX_DATAERR, "invalid mac type %s", *av); 5010 av++; 5011 break; 5012 5013 case TOK_VERREVPATH: 5014 fill_cmd(cmd, O_VERREVPATH, 0, 0); 5015 break; 5016 5017 case TOK_VERSRCREACH: 5018 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 5019 break; 5020 5021 case TOK_ANTISPOOF: 5022 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 5023 break; 5024 5025 case TOK_IPSEC: 5026 fill_cmd(cmd, O_IPSEC, 0, 0); 5027 break; 5028 5029 case TOK_IPV6: 5030 fill_cmd(cmd, O_IP6, 0, 0); 5031 break; 5032 5033 case TOK_IPV4: 5034 fill_cmd(cmd, O_IP4, 0, 0); 5035 break; 5036 5037 case TOK_EXT6HDR: 5038 NEED1("missing extension header"); 5039 fill_ext6hdr( cmd, *av ); 5040 av++; 5041 break; 5042 5043 case TOK_FLOWID: 5044 if (proto != IPPROTO_IPV6 ) 5045 errx( EX_USAGE, "flow-id filter is active " 5046 "only for ipv6 protocol\n"); 5047 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 5048 av++; 5049 break; 5050 5051 case TOK_COMMENT: 5052 fill_comment(cmd, av, cblen); 5053 av[0]=NULL; 5054 break; 5055 5056 case TOK_TAGGED: 5057 if (av[0] && strpbrk(*av, "-,")) { 5058 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 5059 errx(EX_DATAERR, "tagged: invalid tag" 5060 " list: %s", *av); 5061 } 5062 else { 5063 uint16_t tag; 5064 5065 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 5066 TOK_TAGGED, rule_options); 5067 fill_cmd(cmd, O_TAGGED, 0, tag); 5068 } 5069 av++; 5070 break; 5071 5072 case TOK_FIB: 5073 NEED1("fib requires fib number"); 5074 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 5075 av++; 5076 break; 5077 case TOK_SOCKARG: 5078 fill_cmd(cmd, O_SOCKARG, 0, 0); 5079 break; 5080 5081 case TOK_LOOKUP: { 5082 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 5083 5084 if (!av[0] || !av[1]) 5085 errx(EX_USAGE, "format: lookup argument tablenum"); 5086 cmd->opcode = O_IP_DST_LOOKUP; 5087 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 5088 i = match_token(lookup_keys, *av); 5089 if (i == -1) 5090 errx(EX_USAGE, "format: cannot lookup on %s", *av); 5091 __PAST_END(c->d, 1) = i; 5092 av++; 5093 5094 if ((i = pack_table(tstate, *av)) == 0) 5095 errx(EX_DATAERR, "Invalid table name: %s", *av); 5096 5097 cmd->arg1 = i; 5098 av++; 5099 } 5100 break; 5101 case TOK_FLOW: 5102 NEED1("missing table name"); 5103 if (strncmp(*av, "table(", 6) != 0) 5104 errx(EX_DATAERR, 5105 "enclose table name into \"table()\""); 5106 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 5107 av++; 5108 break; 5109 5110 case TOK_SKIPACTION: 5111 if (have_skipcmd) 5112 errx(EX_USAGE, "only one defer-action " 5113 "is allowed"); 5114 have_skipcmd = cmd; 5115 fill_cmd(cmd, O_SKIP_ACTION, 0, 0); 5116 break; 5117 5118 default: 5119 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 5120 } 5121 if (F_LEN(cmd) > 0) { /* prepare to advance */ 5122 prev = cmd; 5123 cmd = next_cmd(cmd, &cblen); 5124 } 5125 } 5126 5127 done: 5128 5129 if (!have_state && have_skipcmd) 5130 warnx("Rule contains \"defer-immediate-action\" " 5131 "and doesn't contain any state-related options."); 5132 5133 /* 5134 * Now copy stuff into the rule. 5135 * If we have a keep-state option, the first instruction 5136 * must be a PROBE_STATE (which is generated here). 5137 * If we have a LOG option, it was stored as the first command, 5138 * and now must be moved to the top of the action part. 5139 */ 5140 dst = (ipfw_insn *)rule->cmd; 5141 5142 /* 5143 * First thing to write into the command stream is the match probability. 5144 */ 5145 if (match_prob != 1) { /* 1 means always match */ 5146 dst->opcode = O_PROB; 5147 dst->len = 2; 5148 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 5149 dst += dst->len; 5150 } 5151 5152 /* 5153 * generate O_PROBE_STATE if necessary 5154 */ 5155 if (have_state && have_state->opcode != O_CHECK_STATE && !have_rstate) { 5156 fill_cmd(dst, O_PROBE_STATE, 0, have_state->arg1); 5157 dst = next_cmd(dst, &rblen); 5158 } 5159 5160 /* 5161 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG, 5162 * O_SKIP_ACTION 5163 */ 5164 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 5165 i = F_LEN(src); 5166 CHECK_RBUFLEN(i); 5167 5168 switch (src->opcode) { 5169 case O_LOG: 5170 case O_KEEP_STATE: 5171 case O_LIMIT: 5172 case O_ALTQ: 5173 case O_TAG: 5174 case O_SKIP_ACTION: 5175 break; 5176 default: 5177 bcopy(src, dst, i * sizeof(uint32_t)); 5178 dst += i; 5179 } 5180 } 5181 5182 /* 5183 * put back the have_state command as last opcode 5184 */ 5185 if (have_state && have_state->opcode != O_CHECK_STATE) { 5186 i = F_LEN(have_state); 5187 CHECK_RBUFLEN(i); 5188 bcopy(have_state, dst, i * sizeof(uint32_t)); 5189 dst += i; 5190 } 5191 5192 /* 5193 * put back the have_skipcmd command as very last opcode 5194 */ 5195 if (have_skipcmd) { 5196 i = F_LEN(have_skipcmd); 5197 CHECK_RBUFLEN(i); 5198 bcopy(have_skipcmd, dst, i * sizeof(uint32_t)); 5199 dst += i; 5200 } 5201 5202 /* 5203 * start action section 5204 */ 5205 rule->act_ofs = dst - rule->cmd; 5206 5207 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 5208 if (have_log) { 5209 i = F_LEN(have_log); 5210 CHECK_RBUFLEN(i); 5211 bcopy(have_log, dst, i * sizeof(uint32_t)); 5212 dst += i; 5213 } 5214 if (have_altq) { 5215 i = F_LEN(have_altq); 5216 CHECK_RBUFLEN(i); 5217 bcopy(have_altq, dst, i * sizeof(uint32_t)); 5218 dst += i; 5219 } 5220 if (have_tag) { 5221 i = F_LEN(have_tag); 5222 CHECK_RBUFLEN(i); 5223 bcopy(have_tag, dst, i * sizeof(uint32_t)); 5224 dst += i; 5225 } 5226 5227 /* 5228 * copy all other actions 5229 */ 5230 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 5231 i = F_LEN(src); 5232 CHECK_RBUFLEN(i); 5233 bcopy(src, dst, i * sizeof(uint32_t)); 5234 dst += i; 5235 } 5236 5237 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 5238 *rbufsize = (char *)dst - (char *)rule; 5239 } 5240 5241 static int 5242 compare_ntlv(const void *_a, const void *_b) 5243 { 5244 const ipfw_obj_ntlv *a, *b; 5245 5246 a = (const ipfw_obj_ntlv *)_a; 5247 b = (const ipfw_obj_ntlv *)_b; 5248 5249 if (a->set < b->set) 5250 return (-1); 5251 else if (a->set > b->set) 5252 return (1); 5253 5254 if (a->idx < b->idx) 5255 return (-1); 5256 else if (a->idx > b->idx) 5257 return (1); 5258 5259 if (a->head.type < b->head.type) 5260 return (-1); 5261 else if (a->head.type > b->head.type) 5262 return (1); 5263 5264 return (0); 5265 } 5266 5267 /* 5268 * Provide kernel with sorted list of referenced objects 5269 */ 5270 static void 5271 object_sort_ctlv(ipfw_obj_ctlv *ctlv) 5272 { 5273 5274 qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv); 5275 } 5276 5277 struct object_kt { 5278 uint16_t uidx; 5279 uint16_t type; 5280 }; 5281 static int 5282 compare_object_kntlv(const void *k, const void *v) 5283 { 5284 const ipfw_obj_ntlv *ntlv; 5285 struct object_kt key; 5286 5287 key = *((const struct object_kt *)k); 5288 ntlv = (const ipfw_obj_ntlv *)v; 5289 5290 if (key.uidx < ntlv->idx) 5291 return (-1); 5292 else if (key.uidx > ntlv->idx) 5293 return (1); 5294 5295 if (key.type < ntlv->head.type) 5296 return (-1); 5297 else if (key.type > ntlv->head.type) 5298 return (1); 5299 5300 return (0); 5301 } 5302 5303 /* 5304 * Finds object name in @ctlv by @idx and @type. 5305 * Uses the following facts: 5306 * 1) All TLVs are the same size 5307 * 2) Kernel implementation provides already sorted list. 5308 * 5309 * Returns table name or NULL. 5310 */ 5311 static char * 5312 object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, uint16_t type) 5313 { 5314 ipfw_obj_ntlv *ntlv; 5315 struct object_kt key; 5316 5317 key.uidx = idx; 5318 key.type = type; 5319 5320 ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize, 5321 compare_object_kntlv); 5322 5323 if (ntlv != NULL) 5324 return (ntlv->name); 5325 5326 return (NULL); 5327 } 5328 5329 static char * 5330 table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx) 5331 { 5332 5333 return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME)); 5334 } 5335 5336 /* 5337 * Adds one or more rules to ipfw chain. 5338 * Data layout: 5339 * Request: 5340 * [ 5341 * ip_fw3_opheader 5342 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 5343 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 5344 * ] 5345 * Reply: 5346 * [ 5347 * ip_fw3_opheader 5348 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 5349 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 5350 * ] 5351 * 5352 * Rules in reply are modified to store their actual ruleset number. 5353 * 5354 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 5355 * according to their idx field and there has to be no duplicates. 5356 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 5357 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 5358 */ 5359 void 5360 ipfw_add(char *av[]) 5361 { 5362 uint32_t rulebuf[1024]; 5363 int rbufsize, default_off, tlen, rlen; 5364 size_t sz; 5365 struct tidx ts; 5366 struct ip_fw_rule *rule; 5367 caddr_t tbuf; 5368 ip_fw3_opheader *op3; 5369 ipfw_obj_ctlv *ctlv, *tstate; 5370 5371 rbufsize = sizeof(rulebuf); 5372 memset(rulebuf, 0, rbufsize); 5373 memset(&ts, 0, sizeof(ts)); 5374 5375 /* Optimize case with no tables */ 5376 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 5377 op3 = (ip_fw3_opheader *)rulebuf; 5378 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5379 rule = (struct ip_fw_rule *)(ctlv + 1); 5380 rbufsize -= default_off; 5381 5382 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 5383 /* Align rule size to u64 boundary */ 5384 rlen = roundup2(rbufsize, sizeof(uint64_t)); 5385 5386 tbuf = NULL; 5387 sz = 0; 5388 tstate = NULL; 5389 if (ts.count != 0) { 5390 /* Some tables. We have to alloc more data */ 5391 tlen = ts.count * sizeof(ipfw_obj_ntlv); 5392 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 5393 5394 if ((tbuf = calloc(1, sz)) == NULL) 5395 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 5396 op3 = (ip_fw3_opheader *)tbuf; 5397 /* Tables first */ 5398 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5399 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 5400 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 5401 ctlv->count = ts.count; 5402 ctlv->objsize = sizeof(ipfw_obj_ntlv); 5403 memcpy(ctlv + 1, ts.idx, tlen); 5404 object_sort_ctlv(ctlv); 5405 tstate = ctlv; 5406 /* Rule next */ 5407 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 5408 ctlv->head.type = IPFW_TLV_RULE_LIST; 5409 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5410 ctlv->count = 1; 5411 memcpy(ctlv + 1, rule, rbufsize); 5412 } else { 5413 /* Simply add header */ 5414 sz = rlen + default_off; 5415 memset(ctlv, 0, sizeof(*ctlv)); 5416 ctlv->head.type = IPFW_TLV_RULE_LIST; 5417 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5418 ctlv->count = 1; 5419 } 5420 5421 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 5422 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 5423 5424 if (!g_co.do_quiet) { 5425 struct format_opts sfo; 5426 struct buf_pr bp; 5427 memset(&sfo, 0, sizeof(sfo)); 5428 sfo.tstate = tstate; 5429 sfo.set_mask = (uint32_t)(-1); 5430 bp_alloc(&bp, 4096); 5431 show_static_rule(&g_co, &sfo, &bp, rule, NULL); 5432 printf("%s", bp.buf); 5433 bp_free(&bp); 5434 } 5435 5436 if (tbuf != NULL) 5437 free(tbuf); 5438 5439 if (ts.idx != NULL) 5440 free(ts.idx); 5441 } 5442 5443 /* 5444 * clear the counters or the log counters. 5445 * optname has the following values: 5446 * 0 (zero both counters and logging) 5447 * 1 (zero logging only) 5448 */ 5449 void 5450 ipfw_zero(int ac, char *av[], int optname) 5451 { 5452 ipfw_range_tlv rt; 5453 char const *errstr; 5454 char const *name = optname ? "RESETLOG" : "ZERO"; 5455 uint32_t arg; 5456 int failed = EX_OK; 5457 5458 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 5459 av++; ac--; 5460 5461 if (ac == 0) { 5462 /* clear all entries */ 5463 memset(&rt, 0, sizeof(rt)); 5464 rt.flags = IPFW_RCFLAG_ALL; 5465 if (do_range_cmd(optname, &rt) < 0) 5466 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 5467 if (!g_co.do_quiet) 5468 printf("%s.\n", optname == IP_FW_XZERO ? 5469 "Accounting cleared":"Logging counts reset"); 5470 5471 return; 5472 } 5473 5474 while (ac) { 5475 /* Rule number */ 5476 if (isdigit(**av)) { 5477 arg = strtonum(*av, 0, 0xffff, &errstr); 5478 if (errstr) 5479 errx(EX_DATAERR, 5480 "invalid rule number %s\n", *av); 5481 memset(&rt, 0, sizeof(rt)); 5482 rt.start_rule = arg; 5483 rt.end_rule = arg; 5484 rt.flags |= IPFW_RCFLAG_RANGE; 5485 if (g_co.use_set != 0) { 5486 rt.set = g_co.use_set - 1; 5487 rt.flags |= IPFW_RCFLAG_SET; 5488 } 5489 if (do_range_cmd(optname, &rt) != 0) { 5490 warn("rule %u: setsockopt(IP_FW_X%s)", 5491 arg, name); 5492 failed = EX_UNAVAILABLE; 5493 } else if (rt.new_set == 0) { 5494 printf("Entry %d not found\n", arg); 5495 failed = EX_UNAVAILABLE; 5496 } else if (!g_co.do_quiet) 5497 printf("Entry %d %s.\n", arg, 5498 optname == IP_FW_XZERO ? 5499 "cleared" : "logging count reset"); 5500 } else { 5501 errx(EX_USAGE, "invalid rule number ``%s''", *av); 5502 } 5503 av++; ac--; 5504 } 5505 if (failed != EX_OK) 5506 exit(failed); 5507 } 5508 5509 void 5510 ipfw_flush(int force) 5511 { 5512 ipfw_range_tlv rt; 5513 5514 if (!force && !g_co.do_quiet) { /* need to ask user */ 5515 int c; 5516 5517 printf("Are you sure? [yn] "); 5518 fflush(stdout); 5519 do { 5520 c = toupper(getc(stdin)); 5521 while (c != '\n' && getc(stdin) != '\n') 5522 if (feof(stdin)) 5523 return; /* and do not flush */ 5524 } while (c != 'Y' && c != 'N'); 5525 printf("\n"); 5526 if (c == 'N') /* user said no */ 5527 return; 5528 } 5529 if (g_co.do_pipe) { 5530 dummynet_flush(); 5531 return; 5532 } 5533 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 5534 memset(&rt, 0, sizeof(rt)); 5535 if (g_co.use_set != 0) { 5536 rt.set = g_co.use_set - 1; 5537 rt.flags = IPFW_RCFLAG_SET; 5538 } else 5539 rt.flags = IPFW_RCFLAG_ALL; 5540 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 5541 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 5542 if (!g_co.do_quiet) 5543 printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules"); 5544 } 5545 5546 static struct _s_x intcmds[] = { 5547 { "talist", TOK_TALIST }, 5548 { "iflist", TOK_IFLIST }, 5549 { "olist", TOK_OLIST }, 5550 { "vlist", TOK_VLIST }, 5551 { NULL, 0 } 5552 }; 5553 5554 static struct _s_x otypes[] = { 5555 { "EACTION", IPFW_TLV_EACTION }, 5556 { "DYNSTATE", IPFW_TLV_STATE_NAME }, 5557 { NULL, 0 } 5558 }; 5559 5560 static const char* 5561 lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type) 5562 { 5563 const char *name; 5564 int i; 5565 5566 name = NULL; 5567 for (i = 0; i < cnt; i++) { 5568 if (ntlv[i].head.type != IPFW_TLV_EACTION) 5569 continue; 5570 if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type) 5571 continue; 5572 name = ntlv[i].name; 5573 break; 5574 } 5575 return (name); 5576 } 5577 5578 static void 5579 ipfw_list_objects(int ac __unused, char *av[] __unused) 5580 { 5581 ipfw_obj_lheader req, *olh; 5582 ipfw_obj_ntlv *ntlv; 5583 const char *name; 5584 size_t sz; 5585 uint32_t i; 5586 5587 memset(&req, 0, sizeof(req)); 5588 sz = sizeof(req); 5589 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0) 5590 if (errno != ENOMEM) 5591 return; 5592 5593 sz = req.size; 5594 if ((olh = calloc(1, sz)) == NULL) 5595 return; 5596 5597 olh->size = sz; 5598 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) { 5599 free(olh); 5600 return; 5601 } 5602 5603 if (olh->count > 0) 5604 printf("Objects list:\n"); 5605 else 5606 printf("There are no objects\n"); 5607 ntlv = (ipfw_obj_ntlv *)(olh + 1); 5608 for (i = 0; i < olh->count; i++) { 5609 name = match_value(otypes, ntlv->head.type); 5610 if (name == NULL) 5611 name = lookup_eaction_name( 5612 (ipfw_obj_ntlv *)(olh + 1), olh->count, 5613 ntlv->head.type); 5614 if (name == NULL) 5615 printf(" kidx: %4d\ttype: %10d\tname: %s\n", 5616 ntlv->idx, ntlv->head.type, ntlv->name); 5617 else 5618 printf(" kidx: %4d\ttype: %10s\tname: %s\n", 5619 ntlv->idx, name, ntlv->name); 5620 ntlv++; 5621 } 5622 free(olh); 5623 } 5624 5625 void 5626 ipfw_internal_handler(int ac, char *av[]) 5627 { 5628 int tcmd; 5629 5630 ac--; av++; 5631 NEED1("internal cmd required"); 5632 5633 if ((tcmd = match_token(intcmds, *av)) == -1) 5634 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 5635 5636 switch (tcmd) { 5637 case TOK_IFLIST: 5638 ipfw_list_tifaces(); 5639 break; 5640 case TOK_TALIST: 5641 ipfw_list_ta(ac, av); 5642 break; 5643 case TOK_OLIST: 5644 ipfw_list_objects(ac, av); 5645 break; 5646 case TOK_VLIST: 5647 ipfw_list_values(ac, av); 5648 break; 5649 } 5650 } 5651 5652 static int 5653 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 5654 { 5655 ipfw_obj_lheader req, *olh; 5656 size_t sz; 5657 5658 memset(&req, 0, sizeof(req)); 5659 sz = sizeof(req); 5660 5661 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 5662 if (errno != ENOMEM) 5663 return (errno); 5664 } 5665 5666 sz = req.size; 5667 if ((olh = calloc(1, sz)) == NULL) 5668 return (ENOMEM); 5669 5670 olh->size = sz; 5671 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 5672 free(olh); 5673 return (errno); 5674 } 5675 5676 *polh = olh; 5677 return (0); 5678 } 5679 5680 static int 5681 ifinfo_cmp(const void *a, const void *b) 5682 { 5683 const ipfw_iface_info *ia, *ib; 5684 5685 ia = (const ipfw_iface_info *)a; 5686 ib = (const ipfw_iface_info *)b; 5687 5688 return (stringnum_cmp(ia->ifname, ib->ifname)); 5689 } 5690 5691 /* 5692 * Retrieves table list from kernel, 5693 * optionally sorts it and calls requested function for each table. 5694 * Returns 0 on success. 5695 */ 5696 static void 5697 ipfw_list_tifaces(void) 5698 { 5699 ipfw_obj_lheader *olh = NULL; 5700 ipfw_iface_info *info; 5701 uint32_t i; 5702 int error; 5703 5704 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 5705 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 5706 5707 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 5708 5709 info = (ipfw_iface_info *)(olh + 1); 5710 for (i = 0; i < olh->count; i++) { 5711 if (info->flags & IPFW_IFFLAG_RESOLVED) 5712 printf("%s ifindex: %d refcount: %u changes: %u\n", 5713 info->ifname, info->ifindex, info->refcnt, 5714 info->gencnt); 5715 else 5716 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 5717 info->ifname, info->refcnt, info->gencnt); 5718 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 5719 } 5720 5721 free(olh); 5722 } 5723