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 if (cmd->arg1 == ICMP_UNREACH_NEEDFRAG && 1894 cmd->len == F_INSN_SIZE(ipfw_insn_u16)) 1895 bprintf(bp, "needfrag %u", 1896 ((const ipfw_insn_u16 *)cmd)->ports[0]); 1897 else 1898 print_reject_code(bp, cmd->arg1); 1899 break; 1900 case O_UNREACH6: 1901 if (cmd->arg1 == ICMP6_UNREACH_RST) 1902 bprintf(bp, "reset6"); 1903 else if (cmd->arg1 == ICMP6_UNREACH_ABORT) 1904 bprintf(bp, "abort6"); 1905 else 1906 print_unreach6_code(bp, cmd->arg1); 1907 break; 1908 case O_SKIPTO: 1909 bprint_uint_arg(bp, "skipto ", cmd->arg1); 1910 break; 1911 case O_PIPE: 1912 bprint_uint_arg(bp, "pipe ", cmd->arg1); 1913 break; 1914 case O_QUEUE: 1915 bprint_uint_arg(bp, "queue ", cmd->arg1); 1916 break; 1917 case O_DIVERT: 1918 bprint_uint_arg(bp, "divert ", cmd->arg1); 1919 break; 1920 case O_TEE: 1921 bprint_uint_arg(bp, "tee ", cmd->arg1); 1922 break; 1923 case O_NETGRAPH: 1924 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 1925 break; 1926 case O_NGTEE: 1927 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 1928 break; 1929 case O_FORWARD_IP: 1930 case O_FORWARD_IP6: 1931 print_fwd(bp, cmd); 1932 break; 1933 case O_LOG: 1934 if (insntod(cmd, log)->max_log > 0) 1935 bprintf(bp, " log logamount %d", 1936 insntod(cmd, log)->max_log); 1937 else 1938 bprintf(bp, " log"); 1939 break; 1940 case O_ALTQ: 1941 #ifndef NO_ALTQ 1942 print_altq_cmd(bp, insntod(cmd, altq)); 1943 #endif 1944 break; 1945 case O_TAG: 1946 bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ": 1947 " tag ", cmd->arg1); 1948 break; 1949 case O_NAT: 1950 if (cmd->arg1 != IP_FW_NAT44_GLOBAL) 1951 bprint_uint_arg(bp, "nat ", cmd->arg1); 1952 else 1953 bprintf(bp, "nat global"); 1954 break; 1955 case O_SETFIB: 1956 if (cmd->arg1 == IP_FW_TARG) 1957 bprint_uint_arg(bp, "setfib ", cmd->arg1); 1958 else 1959 bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF); 1960 break; 1961 case O_EXTERNAL_ACTION: 1962 /* 1963 * The external action can consists of two following 1964 * each other opcodes - O_EXTERNAL_ACTION and 1965 * O_EXTERNAL_INSTANCE. The first contains the ID of 1966 * name of external action. The second contains the ID 1967 * of name of external action instance. 1968 * NOTE: in case when external action has no named 1969 * instances support, the second opcode isn't needed. 1970 */ 1971 state->eaction = cmd; 1972 s = object_search_ctlv(fo->tstate, cmd->arg1, 1973 IPFW_TLV_EACTION); 1974 if (match_token(rule_eactions, s) != -1) 1975 bprintf(bp, "%s", s); 1976 else 1977 bprintf(bp, "eaction %s", s); 1978 break; 1979 case O_EXTERNAL_INSTANCE: 1980 if (state->eaction == NULL) 1981 break; 1982 /* 1983 * XXX: we need to teach ipfw(9) to rewrite opcodes 1984 * in the user buffer on rule addition. When we add 1985 * the rule, we specify zero TLV type for 1986 * O_EXTERNAL_INSTANCE object. To show correct 1987 * rule after `ipfw add` we need to search instance 1988 * name with zero type. But when we do `ipfw show` 1989 * we calculate TLV type using IPFW_TLV_EACTION_NAME() 1990 * macro. 1991 */ 1992 s = object_search_ctlv(fo->tstate, cmd->arg1, 0); 1993 if (s == NULL) 1994 s = object_search_ctlv(fo->tstate, 1995 cmd->arg1, IPFW_TLV_EACTION_NAME( 1996 state->eaction->arg1)); 1997 bprintf(bp, " %s", s); 1998 break; 1999 case O_EXTERNAL_DATA: 2000 if (state->eaction == NULL) 2001 break; 2002 /* 2003 * Currently we support data formatting only for 2004 * external data with datalen u16. For unknown data 2005 * print its size in bytes. 2006 */ 2007 if (cmd->len == F_INSN_SIZE(ipfw_insn)) 2008 bprintf(bp, " %u", cmd->arg1); 2009 else 2010 bprintf(bp, " %ubytes", 2011 cmd->len * sizeof(uint32_t)); 2012 break; 2013 case O_SETDSCP: 2014 if (cmd->arg1 == IP_FW_TARG) { 2015 bprintf(bp, "setdscp tablearg"); 2016 break; 2017 } 2018 s = match_value(f_ipdscp, cmd->arg1 & 0x3F); 2019 if (s != NULL) 2020 bprintf(bp, "setdscp %s", s); 2021 else 2022 bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F); 2023 break; 2024 case O_REASS: 2025 bprintf(bp, "reass"); 2026 break; 2027 case O_CALLRETURN: 2028 if (cmd->len & F_NOT) 2029 bprintf(bp, "return"); 2030 else 2031 bprint_uint_arg(bp, "call ", cmd->arg1); 2032 break; 2033 default: 2034 bprintf(bp, "** unrecognized action %d len %d ", 2035 cmd->opcode, cmd->len); 2036 } 2037 mark_printed(state, cmd); 2038 2039 return (1); 2040 } 2041 2042 2043 static ipfw_insn * 2044 print_action(struct buf_pr *bp, struct format_opts *fo, 2045 struct show_state *state, uint8_t opcode) 2046 { 2047 ipfw_insn *cmd; 2048 int l; 2049 2050 for (l = state->rule->cmd_len - state->rule->act_ofs, 2051 cmd = ACTION_PTR(state->rule); l > 0; 2052 l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2053 if (cmd->opcode != opcode) 2054 continue; 2055 if (!print_action_instruction(bp, fo, state, cmd)) 2056 continue; 2057 return (cmd); 2058 } 2059 return (NULL); 2060 } 2061 2062 static void 2063 print_proto(struct buf_pr *bp, struct format_opts *fo, 2064 struct show_state *state) 2065 { 2066 ipfw_insn *cmd; 2067 int l, proto, ip4, ip6; 2068 2069 /* Count all O_PROTO, O_IP4, O_IP6 instructions. */ 2070 proto = ip4 = ip6 = 0; 2071 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2072 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2073 switch (cmd->opcode) { 2074 case O_PROTO: 2075 proto++; 2076 break; 2077 case O_IP4: 2078 ip4 = 1; 2079 if (cmd->len & F_OR) 2080 ip4++; 2081 break; 2082 case O_IP6: 2083 ip6 = 1; 2084 if (cmd->len & F_OR) 2085 ip6++; 2086 break; 2087 default: 2088 continue; 2089 } 2090 } 2091 if (proto == 0 && ip4 == 0 && ip6 == 0) { 2092 state->proto = IPPROTO_IP; 2093 state->flags |= HAVE_PROTO; 2094 bprintf(bp, " ip"); 2095 return; 2096 } 2097 /* To handle the case { ip4 or ip6 }, print opcode with F_OR first */ 2098 cmd = NULL; 2099 if (ip4 || ip6) 2100 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6); 2101 if (cmd != NULL && (cmd->len & F_OR)) 2102 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4); 2103 if (cmd == NULL || (cmd->len & F_OR)) 2104 for (l = proto; l > 0; l--) { 2105 cmd = print_opcode(bp, fo, state, O_PROTO); 2106 if (cmd == NULL || (cmd->len & F_OR) == 0) 2107 break; 2108 } 2109 /* Initialize proto, it is used by print_newports() */ 2110 state->flags |= HAVE_PROTO; 2111 if (state->proto == 0 && ip6 != 0) 2112 state->proto = IPPROTO_IPV6; 2113 } 2114 2115 static int 2116 match_opcode(int opcode, const int opcodes[], size_t nops) 2117 { 2118 size_t i; 2119 2120 for (i = 0; i < nops; i++) 2121 if (opcode == opcodes[i]) 2122 return (1); 2123 return (0); 2124 } 2125 2126 static void 2127 print_address(struct buf_pr *bp, struct format_opts *fo, 2128 struct show_state *state, const int opcodes[], size_t nops, int portop, 2129 int flag) 2130 { 2131 ipfw_insn *cmd; 2132 int count, l, portcnt, pf; 2133 2134 count = portcnt = 0; 2135 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2136 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2137 if (match_opcode(cmd->opcode, opcodes, nops)) 2138 count++; 2139 else if (cmd->opcode == portop) 2140 portcnt++; 2141 } 2142 if (count == 0) 2143 bprintf(bp, " any"); 2144 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2145 l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2146 if (!match_opcode(cmd->opcode, opcodes, nops)) 2147 continue; 2148 print_instruction(bp, fo, state, cmd); 2149 if ((cmd->len & F_OR) == 0) 2150 break; 2151 count--; 2152 } 2153 /* 2154 * If several O_IP_?PORT opcodes specified, leave them to the 2155 * options section. 2156 */ 2157 if (portcnt == 1) { 2158 for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0; 2159 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2160 if (cmd->opcode != portop) { 2161 pf = (cmd->len & F_OR); 2162 continue; 2163 } 2164 /* Print opcode iff it is not in OR block. */ 2165 if (pf == 0 && (cmd->len & F_OR) == 0) 2166 print_instruction(bp, fo, state, cmd); 2167 break; 2168 } 2169 } 2170 state->flags |= flag; 2171 } 2172 2173 static const int action_opcodes[] = { 2174 O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT, 2175 O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE, 2176 O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT, 2177 O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN, 2178 /* keep the following opcodes at the end of the list */ 2179 O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA 2180 }; 2181 2182 static const int modifier_opcodes[] = { 2183 O_LOG, O_ALTQ, O_TAG 2184 }; 2185 2186 static const int src_opcodes[] = { 2187 O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME, 2188 O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME 2189 }; 2190 2191 static const int dst_opcodes[] = { 2192 O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME, 2193 O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME 2194 }; 2195 2196 static void 2197 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 2198 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 2199 { 2200 static int twidth = 0; 2201 struct show_state state; 2202 ipfw_insn *cmd; 2203 size_t i; 2204 2205 /* Print # DISABLED or skip the rule */ 2206 if ((fo->set_mask & (1 << rule->set)) == 0) { 2207 /* disabled mask */ 2208 if (!co->show_sets) 2209 return; 2210 else 2211 bprintf(bp, "# DISABLED "); 2212 } 2213 if (init_show_state(&state, rule) != 0) { 2214 warn("init_show_state() failed"); 2215 return; 2216 } 2217 bprintf(bp, "%05u ", rule->rulenum); 2218 2219 /* only if counters are available */ 2220 if (cntr != NULL) { 2221 /* Print counters if enabled */ 2222 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2223 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 2224 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 2225 } 2226 2227 /* Print timestamp */ 2228 if (co->do_time == TIMESTAMP_NUMERIC) 2229 bprintf(bp, "%10u ", cntr->timestamp); 2230 else if (co->do_time == TIMESTAMP_STRING) { 2231 char timestr[30]; 2232 time_t t = (time_t)0; 2233 2234 if (twidth == 0) { 2235 strcpy(timestr, ctime(&t)); 2236 *strchr(timestr, '\n') = '\0'; 2237 twidth = strlen(timestr); 2238 } 2239 if (cntr->timestamp > 0) { 2240 t = _long_to_time(cntr->timestamp); 2241 2242 strcpy(timestr, ctime(&t)); 2243 *strchr(timestr, '\n') = '\0'; 2244 bprintf(bp, "%s ", timestr); 2245 } else { 2246 bprintf(bp, "%*s ", twidth, ""); 2247 } 2248 } 2249 } 2250 2251 /* Print set number */ 2252 if (co->show_sets) 2253 bprintf(bp, "set %d ", rule->set); 2254 2255 /* Print the optional "match probability" */ 2256 cmd = print_opcode(bp, fo, &state, O_PROB); 2257 /* Print rule action */ 2258 for (i = 0; i < nitems(action_opcodes); i++) { 2259 cmd = print_action(bp, fo, &state, action_opcodes[i]); 2260 if (cmd == NULL) 2261 continue; 2262 /* Handle special cases */ 2263 switch (cmd->opcode) { 2264 case O_CHECK_STATE: 2265 goto end; 2266 case O_EXTERNAL_ACTION: 2267 case O_EXTERNAL_INSTANCE: 2268 /* External action can have several instructions */ 2269 continue; 2270 } 2271 break; 2272 } 2273 /* Print rule modifiers */ 2274 for (i = 0; i < nitems(modifier_opcodes); i++) 2275 print_action(bp, fo, &state, modifier_opcodes[i]); 2276 /* 2277 * Print rule body 2278 */ 2279 if (co->comment_only != 0) 2280 goto end; 2281 2282 if (rule->flags & IPFW_RULE_JUSTOPTS) { 2283 state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; 2284 goto justopts; 2285 } 2286 2287 print_proto(bp, fo, &state); 2288 if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT)) 2289 goto justopts; 2290 2291 /* Print source */ 2292 bprintf(bp, " from"); 2293 print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes), 2294 O_IP_SRCPORT, HAVE_SRCIP); 2295 2296 /* Print destination */ 2297 bprintf(bp, " to"); 2298 print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes), 2299 O_IP_DSTPORT, HAVE_DSTIP); 2300 2301 justopts: 2302 /* Print the rest of options */ 2303 while (print_opcode(bp, fo, &state, -1)) 2304 ; 2305 end: 2306 /* Print comment at the end */ 2307 cmd = print_opcode(bp, fo, &state, O_NOP); 2308 if (co->comment_only != 0 && cmd == NULL) 2309 bprintf(bp, " // ..."); 2310 bprintf(bp, "\n"); 2311 free_show_state(&state); 2312 } 2313 2314 static void 2315 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2316 struct buf_pr *bp, ipfw_dyn_rule *d) 2317 { 2318 struct protoent *pe; 2319 struct in_addr a; 2320 uint16_t rulenum; 2321 char buf[INET6_ADDRSTRLEN]; 2322 2323 if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT) 2324 return; 2325 2326 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2327 bprintf(bp, "%05d", rulenum); 2328 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2329 bprintf(bp, " "); 2330 pr_u64(bp, &d->pcnt, fo->pcwidth); 2331 pr_u64(bp, &d->bcnt, fo->bcwidth); 2332 bprintf(bp, "(%ds)", d->expire); 2333 } 2334 switch (d->dyn_type) { 2335 case O_LIMIT_PARENT: 2336 bprintf(bp, " PARENT %d", d->count); 2337 break; 2338 case O_LIMIT: 2339 bprintf(bp, " LIMIT"); 2340 break; 2341 case O_KEEP_STATE: /* bidir, no mask */ 2342 bprintf(bp, " STATE"); 2343 break; 2344 } 2345 2346 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2347 bprintf(bp, " %s", pe->p_name); 2348 else 2349 bprintf(bp, " proto %u", d->id.proto); 2350 2351 if (d->id.addr_type == 4) { 2352 a.s_addr = htonl(d->id.src_ip); 2353 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2354 2355 a.s_addr = htonl(d->id.dst_ip); 2356 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2357 } else if (d->id.addr_type == 6) { 2358 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2359 sizeof(buf)), d->id.src_port); 2360 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2361 buf, sizeof(buf)), d->id.dst_port); 2362 } else 2363 bprintf(bp, " UNKNOWN <-> UNKNOWN"); 2364 if (d->kidx != 0) 2365 bprintf(bp, " :%s", object_search_ctlv(fo->tstate, 2366 d->kidx, IPFW_TLV_STATE_NAME)); 2367 2368 #define BOTH_SYN (TH_SYN | (TH_SYN << 8)) 2369 #define BOTH_FIN (TH_FIN | (TH_FIN << 8)) 2370 if (co->verbose) { 2371 bprintf(bp, " state 0x%08x%s", d->state, 2372 d->state ? " ": ","); 2373 if (d->state & IPFW_DYN_ORPHANED) 2374 bprintf(bp, "ORPHANED,"); 2375 if ((d->state & BOTH_SYN) == BOTH_SYN) 2376 bprintf(bp, "BOTH_SYN,"); 2377 else { 2378 if (d->state & TH_SYN) 2379 bprintf(bp, "F_SYN,"); 2380 if (d->state & (TH_SYN << 8)) 2381 bprintf(bp, "R_SYN,"); 2382 } 2383 if ((d->state & BOTH_FIN) == BOTH_FIN) 2384 bprintf(bp, "BOTH_FIN,"); 2385 else { 2386 if (d->state & TH_FIN) 2387 bprintf(bp, "F_FIN,"); 2388 if (d->state & (TH_FIN << 8)) 2389 bprintf(bp, "R_FIN,"); 2390 } 2391 bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd, 2392 d->ack_rev); 2393 } 2394 } 2395 2396 static int 2397 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2398 { 2399 ipfw_range_header rh; 2400 size_t sz; 2401 2402 memset(&rh, 0, sizeof(rh)); 2403 memcpy(&rh.range, rt, sizeof(*rt)); 2404 rh.range.head.length = sizeof(*rt); 2405 rh.range.head.type = IPFW_TLV_RANGE; 2406 sz = sizeof(rh); 2407 2408 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2409 return (-1); 2410 /* Save number of matched objects */ 2411 rt->new_set = rh.range.new_set; 2412 return (0); 2413 } 2414 2415 /* 2416 * This one handles all set-related commands 2417 * ipfw set { show | enable | disable } 2418 * ipfw set swap X Y 2419 * ipfw set move X to Y 2420 * ipfw set move rule X to Y 2421 */ 2422 void 2423 ipfw_sets_handler(char *av[]) 2424 { 2425 ipfw_range_tlv rt; 2426 const char *msg; 2427 size_t size; 2428 uint32_t masks[2]; 2429 int i; 2430 uint16_t rulenum; 2431 uint8_t cmd; 2432 2433 av++; 2434 memset(&rt, 0, sizeof(rt)); 2435 2436 if (av[0] == NULL) 2437 errx(EX_USAGE, "set needs command"); 2438 if (_substrcmp(*av, "show") == 0) { 2439 struct format_opts fo; 2440 ipfw_cfg_lheader *cfg; 2441 2442 memset(&fo, 0, sizeof(fo)); 2443 if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0) 2444 err(EX_OSERR, "requesting config failed"); 2445 2446 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2447 if ((cfg->set_mask & (1<<i)) == 0) { 2448 printf("%s %d", msg, i); 2449 msg = ""; 2450 } 2451 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2452 for (i = 0; i < RESVD_SET; i++) 2453 if ((cfg->set_mask & (1<<i)) != 0) { 2454 printf("%s %d", msg, i); 2455 msg = ""; 2456 } 2457 printf("\n"); 2458 free(cfg); 2459 } else if (_substrcmp(*av, "swap") == 0) { 2460 av++; 2461 if ( av[0] == NULL || av[1] == NULL ) 2462 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2463 rt.set = atoi(av[0]); 2464 rt.new_set = atoi(av[1]); 2465 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2466 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2467 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2468 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2469 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2470 } else if (_substrcmp(*av, "move") == 0) { 2471 av++; 2472 if (av[0] && _substrcmp(*av, "rule") == 0) { 2473 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2474 cmd = IP_FW_XMOVE; 2475 av++; 2476 } else 2477 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2478 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2479 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2480 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2481 rulenum = atoi(av[0]); 2482 rt.new_set = atoi(av[2]); 2483 if (cmd == IP_FW_XMOVE) { 2484 rt.start_rule = rulenum; 2485 rt.end_rule = rulenum; 2486 } else 2487 rt.set = rulenum; 2488 rt.new_set = atoi(av[2]); 2489 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2490 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2491 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2492 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2493 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2494 i = do_range_cmd(cmd, &rt); 2495 if (i < 0) 2496 err(EX_OSERR, "failed to move %s", 2497 cmd == IP_FW_SET_MOVE ? "set": "rule"); 2498 } else if (_substrcmp(*av, "disable") == 0 || 2499 _substrcmp(*av, "enable") == 0 ) { 2500 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2501 2502 av++; 2503 masks[0] = masks[1] = 0; 2504 2505 while (av[0]) { 2506 if (isdigit(**av)) { 2507 i = atoi(*av); 2508 if (i < 0 || i > RESVD_SET) 2509 errx(EX_DATAERR, 2510 "invalid set number %d\n", i); 2511 masks[which] |= (1<<i); 2512 } else if (_substrcmp(*av, "disable") == 0) 2513 which = 0; 2514 else if (_substrcmp(*av, "enable") == 0) 2515 which = 1; 2516 else 2517 errx(EX_DATAERR, 2518 "invalid set command %s\n", *av); 2519 av++; 2520 } 2521 if ( (masks[0] & masks[1]) != 0 ) 2522 errx(EX_DATAERR, 2523 "cannot enable and disable the same set\n"); 2524 2525 rt.set = masks[0]; 2526 rt.new_set = masks[1]; 2527 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2528 if (i) 2529 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2530 } else 2531 errx(EX_USAGE, "invalid set command %s\n", *av); 2532 } 2533 2534 void 2535 ipfw_sysctl_handler(char *av[], int which) 2536 { 2537 av++; 2538 2539 if (av[0] == NULL) { 2540 warnx("missing keyword to enable/disable\n"); 2541 } else if (_substrcmp(*av, "firewall") == 0) { 2542 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2543 &which, sizeof(which)); 2544 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2545 &which, sizeof(which)); 2546 } else if (_substrcmp(*av, "one_pass") == 0) { 2547 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2548 &which, sizeof(which)); 2549 } else if (_substrcmp(*av, "debug") == 0) { 2550 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2551 &which, sizeof(which)); 2552 } else if (_substrcmp(*av, "verbose") == 0) { 2553 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2554 &which, sizeof(which)); 2555 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2556 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2557 &which, sizeof(which)); 2558 #ifndef NO_ALTQ 2559 } else if (_substrcmp(*av, "altq") == 0) { 2560 altq_set_enabled(which); 2561 #endif 2562 } else { 2563 warnx("unrecognize enable/disable keyword: %s\n", *av); 2564 } 2565 } 2566 2567 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2568 void *arg, void *state); 2569 2570 static void 2571 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2572 void *arg __unused, void *_state) 2573 { 2574 ipfw_dyn_rule *d; 2575 int width; 2576 uint8_t set; 2577 2578 d = (ipfw_dyn_rule *)_state; 2579 /* Count _ALL_ states */ 2580 fo->dcnt++; 2581 2582 if (fo->show_counters == 0) 2583 return; 2584 2585 if (co->use_set) { 2586 /* skip states from another set */ 2587 bcopy((char *)&d->rule + sizeof(uint16_t), &set, 2588 sizeof(uint8_t)); 2589 if (set != co->use_set - 1) 2590 return; 2591 } 2592 2593 width = pr_u64(NULL, &d->pcnt, 0); 2594 if (width > fo->pcwidth) 2595 fo->pcwidth = width; 2596 2597 width = pr_u64(NULL, &d->bcnt, 0); 2598 if (width > fo->bcwidth) 2599 fo->bcwidth = width; 2600 } 2601 2602 static int 2603 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2604 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2605 { 2606 int ttype; 2607 state_cb *fptr; 2608 void *farg; 2609 ipfw_obj_tlv *tlv; 2610 ipfw_obj_ctlv *ctlv; 2611 2612 fptr = NULL; 2613 ttype = 0; 2614 2615 while (sz > 0) { 2616 ctlv = (ipfw_obj_ctlv *)base; 2617 switch (ctlv->head.type) { 2618 case IPFW_TLV_DYNSTATE_LIST: 2619 base += sizeof(*ctlv); 2620 sz -= sizeof(*ctlv); 2621 ttype = IPFW_TLV_DYN_ENT; 2622 fptr = dyn_bc; 2623 farg = dyn_arg; 2624 break; 2625 default: 2626 return (sz); 2627 } 2628 2629 while (sz > 0) { 2630 tlv = (ipfw_obj_tlv *)base; 2631 if (tlv->type != ttype) 2632 break; 2633 2634 fptr(co, fo, farg, tlv + 1); 2635 sz -= tlv->length; 2636 base += tlv->length; 2637 } 2638 } 2639 2640 return (sz); 2641 } 2642 2643 static void 2644 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2645 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2646 { 2647 int bcwidth, pcwidth, width; 2648 int n; 2649 struct ip_fw_bcounter *cntr; 2650 struct ip_fw_rule *r; 2651 2652 bcwidth = 0; 2653 pcwidth = 0; 2654 if (fo->show_counters != 0) { 2655 for (n = 0; n < rcnt; n++, 2656 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2657 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2658 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2659 /* skip rules from another set */ 2660 if (co->use_set && r->set != co->use_set - 1) 2661 continue; 2662 2663 /* packet counter */ 2664 width = pr_u64(NULL, &cntr->pcnt, 0); 2665 if (width > pcwidth) 2666 pcwidth = width; 2667 2668 /* byte counter */ 2669 width = pr_u64(NULL, &cntr->bcnt, 0); 2670 if (width > bcwidth) 2671 bcwidth = width; 2672 } 2673 } 2674 fo->bcwidth = bcwidth; 2675 fo->pcwidth = pcwidth; 2676 2677 fo->dcnt = 0; 2678 if (co->do_dynamic && dynsz > 0) 2679 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2680 } 2681 2682 static int 2683 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2684 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2685 { 2686 int n, seen; 2687 struct ip_fw_rule *r; 2688 struct ip_fw_bcounter *cntr; 2689 2690 for (n = seen = 0; n < rcnt; n++, 2691 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2692 2693 if ((fo->show_counters | fo->show_time) != 0) { 2694 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2695 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2696 } else { 2697 cntr = NULL; 2698 r = (struct ip_fw_rule *)(rtlv + 1); 2699 } 2700 if (r->rulenum > fo->last) 2701 break; 2702 if (co->use_set && r->set != co->use_set - 1) 2703 continue; 2704 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2705 show_static_rule(co, fo, bp, r, cntr); 2706 printf("%s", bp->buf); 2707 bp_flush(bp); 2708 seen++; 2709 } 2710 } 2711 2712 return (seen); 2713 } 2714 2715 static void 2716 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2717 void *_arg, void *_state) 2718 { 2719 uint16_t rulenum; 2720 uint8_t set; 2721 ipfw_dyn_rule *d; 2722 struct buf_pr *bp; 2723 2724 d = (ipfw_dyn_rule *)_state; 2725 bp = (struct buf_pr *)_arg; 2726 2727 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2728 if (rulenum > fo->last) 2729 return; 2730 if (co->use_set) { 2731 bcopy((char *)&d->rule + sizeof(uint16_t), 2732 &set, sizeof(uint8_t)); 2733 if (set != co->use_set - 1) 2734 return; 2735 } 2736 if (rulenum >= fo->first) { 2737 show_dyn_state(co, fo, bp, d); 2738 printf("%s\n", bp->buf); 2739 bp_flush(bp); 2740 } 2741 } 2742 2743 static int 2744 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2745 struct buf_pr *bp, caddr_t base, size_t sz) 2746 { 2747 2748 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2749 return (sz); 2750 } 2751 2752 void 2753 ipfw_list(int ac, char *av[], int show_counters) 2754 { 2755 ipfw_cfg_lheader *cfg; 2756 struct format_opts sfo; 2757 size_t sz; 2758 int error; 2759 int lac; 2760 char **lav; 2761 uint32_t rnum; 2762 char *endptr; 2763 2764 if (g_co.test_only) { 2765 fprintf(stderr, "Testing only, list disabled\n"); 2766 return; 2767 } 2768 if (g_co.do_pipe) { 2769 dummynet_list(ac, av, show_counters); 2770 return; 2771 } 2772 2773 ac--; 2774 av++; 2775 memset(&sfo, 0, sizeof(sfo)); 2776 2777 /* Determine rule range to request */ 2778 if (ac > 0) { 2779 for (lac = ac, lav = av; lac != 0; lac--) { 2780 rnum = strtoul(*lav++, &endptr, 10); 2781 if (sfo.first == 0 || rnum < sfo.first) 2782 sfo.first = rnum; 2783 2784 if (*endptr == '-') 2785 rnum = strtoul(endptr + 1, &endptr, 10); 2786 if (sfo.last == 0 || rnum > sfo.last) 2787 sfo.last = rnum; 2788 } 2789 } 2790 2791 /* get configuraion from kernel */ 2792 cfg = NULL; 2793 sfo.show_counters = show_counters; 2794 sfo.show_time = g_co.do_time; 2795 if (g_co.do_dynamic != 2) 2796 sfo.flags |= IPFW_CFG_GET_STATIC; 2797 if (g_co.do_dynamic != 0) 2798 sfo.flags |= IPFW_CFG_GET_STATES; 2799 if ((sfo.show_counters | sfo.show_time) != 0) 2800 sfo.flags |= IPFW_CFG_GET_COUNTERS; 2801 if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0) 2802 err(EX_OSERR, "retrieving config failed"); 2803 2804 error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av); 2805 2806 free(cfg); 2807 2808 if (error != EX_OK) 2809 exit(error); 2810 } 2811 2812 static int 2813 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 2814 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 2815 { 2816 caddr_t dynbase; 2817 size_t dynsz; 2818 int rcnt; 2819 int exitval = EX_OK; 2820 int lac; 2821 char **lav; 2822 char *endptr; 2823 size_t readsz; 2824 struct buf_pr bp; 2825 ipfw_obj_ctlv *ctlv; 2826 ipfw_obj_tlv *rbase; 2827 2828 /* 2829 * Handle tablenames TLV first, if any 2830 */ 2831 rbase = NULL; 2832 dynbase = NULL; 2833 dynsz = 0; 2834 readsz = sizeof(*cfg); 2835 rcnt = 0; 2836 2837 fo->set_mask = cfg->set_mask; 2838 2839 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 2840 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 2841 object_sort_ctlv(ctlv); 2842 fo->tstate = ctlv; 2843 readsz += ctlv->head.length; 2844 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 2845 } 2846 2847 if (cfg->flags & IPFW_CFG_GET_STATIC) { 2848 /* We've requested static rules */ 2849 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 2850 rbase = (ipfw_obj_tlv *)(ctlv + 1); 2851 rcnt = ctlv->count; 2852 readsz += ctlv->head.length; 2853 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2854 ctlv->head.length); 2855 } 2856 } 2857 2858 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 2859 /* We may have some dynamic states */ 2860 dynsz = sz - readsz; 2861 /* Skip empty header */ 2862 if (dynsz != sizeof(ipfw_obj_ctlv)) 2863 dynbase = (caddr_t)ctlv; 2864 else 2865 dynsz = 0; 2866 } 2867 2868 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 2869 bp_alloc(&bp, 4096); 2870 2871 /* if no rule numbers were specified, list all rules */ 2872 if (ac == 0) { 2873 fo->first = 0; 2874 fo->last = IPFW_DEFAULT_RULE; 2875 if (cfg->flags & IPFW_CFG_GET_STATIC) 2876 list_static_range(co, fo, &bp, rbase, rcnt); 2877 2878 if (co->do_dynamic && dynsz > 0) { 2879 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, 2880 dynsz); 2881 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2882 } 2883 2884 bp_free(&bp); 2885 return (EX_OK); 2886 } 2887 2888 /* display specific rules requested on command line */ 2889 for (lac = ac, lav = av; lac != 0; lac--) { 2890 /* convert command line rule # */ 2891 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2892 if (*endptr == '-') 2893 fo->last = strtoul(endptr + 1, &endptr, 10); 2894 if (*endptr) { 2895 exitval = EX_USAGE; 2896 warnx("invalid rule number: %s", *(lav - 1)); 2897 continue; 2898 } 2899 2900 if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0) 2901 continue; 2902 2903 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 2904 /* give precedence to other error(s) */ 2905 if (exitval == EX_OK) 2906 exitval = EX_UNAVAILABLE; 2907 if (fo->first == fo->last) 2908 warnx("rule %u does not exist", fo->first); 2909 else 2910 warnx("no rules in range %u-%u", 2911 fo->first, fo->last); 2912 } 2913 } 2914 2915 if (co->do_dynamic && dynsz > 0) { 2916 printf("## Dynamic rules:\n"); 2917 for (lac = ac, lav = av; lac != 0; lac--) { 2918 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2919 if (*endptr == '-') 2920 fo->last = strtoul(endptr+1, &endptr, 10); 2921 if (*endptr) 2922 /* already warned */ 2923 continue; 2924 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2925 } 2926 } 2927 2928 bp_free(&bp); 2929 return (exitval); 2930 } 2931 2932 2933 /* 2934 * Retrieves current ipfw configuration of given type 2935 * and stores its pointer to @pcfg. 2936 * 2937 * Caller is responsible for freeing @pcfg. 2938 * 2939 * Returns 0 on success. 2940 */ 2941 2942 static int 2943 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 2944 ipfw_cfg_lheader **pcfg, size_t *psize) 2945 { 2946 ipfw_cfg_lheader *cfg; 2947 size_t sz; 2948 int i; 2949 2950 2951 if (co->test_only != 0) { 2952 fprintf(stderr, "Testing only, list disabled\n"); 2953 return (0); 2954 } 2955 2956 /* Start with some data size */ 2957 sz = 4096; 2958 cfg = NULL; 2959 2960 for (i = 0; i < 16; i++) { 2961 if (cfg != NULL) 2962 free(cfg); 2963 if ((cfg = calloc(1, sz)) == NULL) 2964 return (ENOMEM); 2965 2966 cfg->flags = fo->flags; 2967 cfg->start_rule = fo->first; 2968 cfg->end_rule = fo->last; 2969 2970 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 2971 if (errno != ENOMEM) { 2972 free(cfg); 2973 return (errno); 2974 } 2975 2976 /* Buffer size is not enough. Try to increase */ 2977 sz = sz * 2; 2978 if (sz < cfg->size) 2979 sz = cfg->size; 2980 continue; 2981 } 2982 2983 *pcfg = cfg; 2984 *psize = sz; 2985 return (0); 2986 } 2987 2988 free(cfg); 2989 return (ENOMEM); 2990 } 2991 2992 static int 2993 lookup_host (char *host, struct in_addr *ipaddr) 2994 { 2995 struct hostent *he; 2996 2997 if (!inet_aton(host, ipaddr)) { 2998 if ((he = gethostbyname(host)) == NULL) 2999 return(-1); 3000 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 3001 } 3002 return(0); 3003 } 3004 3005 struct tidx { 3006 ipfw_obj_ntlv *idx; 3007 uint32_t count; 3008 uint32_t size; 3009 uint16_t counter; 3010 uint8_t set; 3011 }; 3012 3013 int 3014 ipfw_check_object_name(const char *name) 3015 { 3016 int c, i, l; 3017 3018 /* 3019 * Check that name is null-terminated and contains 3020 * valid symbols only. Valid mask is: 3021 * [a-zA-Z0-9\-_\.]{1,63} 3022 */ 3023 l = strlen(name); 3024 if (l == 0 || l >= 64) 3025 return (EINVAL); 3026 for (i = 0; i < l; i++) { 3027 c = name[i]; 3028 if (isalpha(c) || isdigit(c) || c == '_' || 3029 c == '-' || c == '.') 3030 continue; 3031 return (EINVAL); 3032 } 3033 return (0); 3034 } 3035 3036 static const char *default_state_name = "default"; 3037 3038 static int 3039 state_check_name(const char *name) 3040 { 3041 3042 if (ipfw_check_object_name(name) != 0) 3043 return (EINVAL); 3044 if (strcmp(name, "any") == 0) 3045 return (EINVAL); 3046 return (0); 3047 } 3048 3049 static int 3050 eaction_check_name(const char *name) 3051 { 3052 3053 if (ipfw_check_object_name(name) != 0) 3054 return (EINVAL); 3055 /* Restrict some 'special' names */ 3056 if (match_token(rule_actions, name) != -1 && 3057 match_token(rule_action_params, name) != -1) 3058 return (EINVAL); 3059 return (0); 3060 } 3061 3062 static uint16_t 3063 pack_object(struct tidx *tstate, const char *name, int otype) 3064 { 3065 ipfw_obj_ntlv *ntlv; 3066 uint32_t i; 3067 3068 for (i = 0; i < tstate->count; i++) { 3069 if (strcmp(tstate->idx[i].name, name) != 0) 3070 continue; 3071 if (tstate->idx[i].set != tstate->set) 3072 continue; 3073 if (tstate->idx[i].head.type != otype) 3074 continue; 3075 3076 return (tstate->idx[i].idx); 3077 } 3078 3079 if (tstate->count + 1 > tstate->size) { 3080 tstate->size += 4; 3081 tstate->idx = realloc(tstate->idx, tstate->size * 3082 sizeof(ipfw_obj_ntlv)); 3083 if (tstate->idx == NULL) 3084 return (0); 3085 } 3086 3087 ntlv = &tstate->idx[i]; 3088 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 3089 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 3090 ntlv->head.type = otype; 3091 ntlv->head.length = sizeof(ipfw_obj_ntlv); 3092 ntlv->set = tstate->set; 3093 ntlv->idx = ++tstate->counter; 3094 tstate->count++; 3095 3096 return (ntlv->idx); 3097 } 3098 3099 static uint16_t 3100 pack_table(struct tidx *tstate, const char *name) 3101 { 3102 3103 if (table_check_name(name) != 0) 3104 return (0); 3105 3106 return (pack_object(tstate, name, IPFW_TLV_TBL_NAME)); 3107 } 3108 3109 void 3110 fill_table(struct _ipfw_insn *cmd, char *av, uint8_t opcode, 3111 struct tidx *tstate) 3112 { 3113 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3114 uint16_t uidx; 3115 char *p; 3116 3117 if ((p = strchr(av + 6, ')')) == NULL) 3118 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 3119 *p = '\0'; 3120 p = strchr(av + 6, ','); 3121 if (p) 3122 *p++ = '\0'; 3123 3124 if ((uidx = pack_table(tstate, av + 6)) == 0) 3125 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 3126 3127 cmd->opcode = opcode; 3128 cmd->arg1 = uidx; 3129 if (p) { 3130 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3131 d[0] = strtoul(p, NULL, 0); 3132 } else 3133 cmd->len |= F_INSN_SIZE(ipfw_insn); 3134 } 3135 3136 3137 /* 3138 * fills the addr and mask fields in the instruction as appropriate from av. 3139 * Update length as appropriate. 3140 * The following formats are allowed: 3141 * me returns O_IP_*_ME 3142 * 1.2.3.4 single IP address 3143 * 1.2.3.4:5.6.7.8 address:mask 3144 * 1.2.3.4/24 address/mask 3145 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 3146 * We can have multiple comma-separated address/mask entries. 3147 */ 3148 static void 3149 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 3150 { 3151 int len = 0; 3152 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3153 3154 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 3155 3156 if (_substrcmp(av, "any") == 0) 3157 return; 3158 3159 if (_substrcmp(av, "me") == 0) { 3160 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 3161 return; 3162 } 3163 3164 if (strncmp(av, "table(", 6) == 0) { 3165 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 3166 return; 3167 } 3168 3169 while (av) { 3170 /* 3171 * After the address we can have '/' or ':' indicating a mask, 3172 * ',' indicating another address follows, '{' indicating a 3173 * set of addresses of unspecified size. 3174 */ 3175 char *t = NULL, *p = strpbrk(av, "/:,{"); 3176 int masklen; 3177 char md, nd = '\0'; 3178 3179 CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len); 3180 3181 if (p) { 3182 md = *p; 3183 *p++ = '\0'; 3184 if ((t = strpbrk(p, ",{")) != NULL) { 3185 nd = *t; 3186 *t = '\0'; 3187 } 3188 } else 3189 md = '\0'; 3190 3191 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 3192 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 3193 switch (md) { 3194 case ':': 3195 if (!inet_aton(p, (struct in_addr *)&d[1])) 3196 errx(EX_DATAERR, "bad netmask ``%s''", p); 3197 break; 3198 case '/': 3199 masklen = atoi(p); 3200 if (masklen == 0) 3201 d[1] = htonl(0U); /* mask */ 3202 else if (masklen > 32) 3203 errx(EX_DATAERR, "bad width ``%s''", p); 3204 else 3205 d[1] = htonl(~0U << (32 - masklen)); 3206 break; 3207 case '{': /* no mask, assume /24 and put back the '{' */ 3208 d[1] = htonl(~0U << (32 - 24)); 3209 *(--p) = md; 3210 break; 3211 3212 case ',': /* single address plus continuation */ 3213 *(--p) = md; 3214 /* FALLTHROUGH */ 3215 case 0: /* initialization value */ 3216 default: 3217 d[1] = htonl(~0U); /* force /32 */ 3218 break; 3219 } 3220 d[0] &= d[1]; /* mask base address with mask */ 3221 if (t) 3222 *t = nd; 3223 /* find next separator */ 3224 if (p) 3225 p = strpbrk(p, ",{"); 3226 if (p && *p == '{') { 3227 /* 3228 * We have a set of addresses. They are stored as follows: 3229 * arg1 is the set size (powers of 2, 2..256) 3230 * addr is the base address IN HOST FORMAT 3231 * mask.. is an array of arg1 bits (rounded up to 3232 * the next multiple of 32) with bits set 3233 * for each host in the map. 3234 */ 3235 uint32_t *map = (uint32_t *)&cmd->mask; 3236 int low, high; 3237 int i = contigmask((uint8_t *)&(d[1]), 32); 3238 3239 if (len > 0) 3240 errx(EX_DATAERR, "address set cannot be in a list"); 3241 if (i < 24 || i > 31) 3242 errx(EX_DATAERR, "invalid set with mask %d\n", i); 3243 cmd->o.arg1 = 1<<(32-i); /* map length */ 3244 d[0] = ntohl(d[0]); /* base addr in host format */ 3245 cmd->o.opcode = O_IP_DST_SET; /* default */ 3246 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 3247 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 3248 map[i] = 0; /* clear map */ 3249 3250 av = p + 1; 3251 low = d[0] & 0xff; 3252 high = low + cmd->o.arg1 - 1; 3253 /* 3254 * Here, i stores the previous value when we specify a range 3255 * of addresses within a mask, e.g. 45-63. i = -1 means we 3256 * have no previous value. 3257 */ 3258 i = -1; /* previous value in a range */ 3259 while (isdigit(*av)) { 3260 char *s; 3261 int a = strtol(av, &s, 0); 3262 3263 if (s == av) { /* no parameter */ 3264 if (*av != '}') 3265 errx(EX_DATAERR, "set not closed\n"); 3266 if (i != -1) 3267 errx(EX_DATAERR, "incomplete range %d-", i); 3268 break; 3269 } 3270 if (a < low || a > high) 3271 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 3272 a, low, high); 3273 a -= low; 3274 if (i == -1) /* no previous in range */ 3275 i = a; 3276 else { /* check that range is valid */ 3277 if (i > a) 3278 errx(EX_DATAERR, "invalid range %d-%d", 3279 i+low, a+low); 3280 if (*s == '-') 3281 errx(EX_DATAERR, "double '-' in range"); 3282 } 3283 for (; i <= a; i++) 3284 map[i/32] |= 1<<(i & 31); 3285 i = -1; 3286 if (*s == '-') 3287 i = a; 3288 else if (*s == '}') 3289 break; 3290 av = s+1; 3291 } 3292 return; 3293 } 3294 av = p; 3295 if (av) /* then *av must be a ',' */ 3296 av++; 3297 3298 /* Check this entry */ 3299 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 3300 /* 3301 * 'any' turns the entire list into a NOP. 3302 * 'not any' never matches, so it is removed from the 3303 * list unless it is the only item, in which case we 3304 * report an error. 3305 */ 3306 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 3307 if (av == NULL && len == 0) /* only this entry */ 3308 errx(EX_DATAERR, "not any never matches"); 3309 } 3310 /* else do nothing and skip this entry */ 3311 return; 3312 } 3313 /* A single IP can be stored in an optimized format */ 3314 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 3315 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 3316 return; 3317 } 3318 len += 2; /* two words... */ 3319 d += 2; 3320 } /* end while */ 3321 if (len + 1 > F_LEN_MASK) 3322 errx(EX_DATAERR, "address list too long"); 3323 cmd->o.len |= len+1; 3324 } 3325 3326 3327 /* n2mask sets n bits of the mask */ 3328 void 3329 n2mask(struct in6_addr *mask, int n) 3330 { 3331 static int minimask[9] = 3332 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 3333 u_char *p; 3334 3335 memset(mask, 0, sizeof(struct in6_addr)); 3336 p = (u_char *) mask; 3337 for (; n > 0; p++, n -= 8) { 3338 if (n >= 8) 3339 *p = 0xff; 3340 else 3341 *p = minimask[n]; 3342 } 3343 return; 3344 } 3345 3346 static void 3347 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 3348 struct _s_x *flags, char *p) 3349 { 3350 char *e; 3351 uint32_t set = 0, clear = 0; 3352 3353 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3354 errx(EX_DATAERR, "invalid flag %s", e); 3355 3356 cmd->opcode = opcode; 3357 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3358 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3359 } 3360 3361 3362 void 3363 ipfw_delete(char *av[]) 3364 { 3365 ipfw_range_tlv rt; 3366 char *sep; 3367 int i, j; 3368 int exitval = EX_OK; 3369 int do_set = 0; 3370 3371 av++; 3372 NEED1("missing rule specification"); 3373 if ( *av && _substrcmp(*av, "set") == 0) { 3374 /* Do not allow using the following syntax: 3375 * ipfw set N delete set M 3376 */ 3377 if (g_co.use_set) 3378 errx(EX_DATAERR, "invalid syntax"); 3379 do_set = 1; /* delete set */ 3380 av++; 3381 } 3382 3383 /* Rule number */ 3384 while (*av && isdigit(**av)) { 3385 i = strtol(*av, &sep, 10); 3386 j = i; 3387 if (*sep== '-') 3388 j = strtol(sep + 1, NULL, 10); 3389 av++; 3390 if (g_co.do_nat) { 3391 exitval = ipfw_delete_nat(i); 3392 } else if (g_co.do_pipe) { 3393 exitval = ipfw_delete_pipe(g_co.do_pipe, i); 3394 } else { 3395 memset(&rt, 0, sizeof(rt)); 3396 if (do_set != 0) { 3397 rt.set = i & 31; 3398 rt.flags = IPFW_RCFLAG_SET; 3399 } else { 3400 rt.start_rule = i & 0xffff; 3401 rt.end_rule = j & 0xffff; 3402 if (rt.start_rule == 0 && rt.end_rule == 0) 3403 rt.flags |= IPFW_RCFLAG_ALL; 3404 else 3405 rt.flags |= IPFW_RCFLAG_RANGE; 3406 if (g_co.use_set != 0) { 3407 rt.set = g_co.use_set - 1; 3408 rt.flags |= IPFW_RCFLAG_SET; 3409 } 3410 } 3411 if (g_co.do_dynamic == 2) 3412 rt.flags |= IPFW_RCFLAG_DYNAMIC; 3413 i = do_range_cmd(IP_FW_XDEL, &rt); 3414 if (i != 0) { 3415 exitval = EX_UNAVAILABLE; 3416 if (g_co.do_quiet) 3417 continue; 3418 warn("rule %u: setsockopt(IP_FW_XDEL)", 3419 rt.start_rule); 3420 } else if (rt.new_set == 0 && do_set == 0 && 3421 g_co.do_dynamic != 2) { 3422 exitval = EX_UNAVAILABLE; 3423 if (g_co.do_quiet) 3424 continue; 3425 if (rt.start_rule != rt.end_rule) 3426 warnx("no rules rules in %u-%u range", 3427 rt.start_rule, rt.end_rule); 3428 else 3429 warnx("rule %u not found", 3430 rt.start_rule); 3431 } 3432 } 3433 } 3434 if (exitval != EX_OK && g_co.do_force == 0) 3435 exit(exitval); 3436 } 3437 3438 3439 /* 3440 * fill the interface structure. We do not check the name as we can 3441 * create interfaces dynamically, so checking them at insert time 3442 * makes relatively little sense. 3443 * Interface names containing '*', '?', or '[' are assumed to be shell 3444 * patterns which match interfaces. 3445 */ 3446 static void 3447 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3448 { 3449 char *p; 3450 uint16_t uidx; 3451 3452 cmd->name[0] = '\0'; 3453 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3454 3455 CHECK_CMDLEN; 3456 3457 /* Parse the interface or address */ 3458 if (strcmp(arg, "any") == 0) 3459 cmd->o.len = 0; /* effectively ignore this command */ 3460 else if (strncmp(arg, "table(", 6) == 0) { 3461 if ((p = strchr(arg + 6, ')')) == NULL) 3462 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3463 *p = '\0'; 3464 p = strchr(arg + 6, ','); 3465 if (p) 3466 *p++ = '\0'; 3467 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3468 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3469 3470 cmd->name[0] = '\1'; /* Special value indicating table */ 3471 cmd->p.kidx = uidx; 3472 } else if (!isdigit(*arg)) { 3473 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3474 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3475 } else if (!inet_aton(arg, &cmd->p.ip)) 3476 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3477 } 3478 3479 static void 3480 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3481 { 3482 int i; 3483 size_t l; 3484 char *ap, *ptr, *optr; 3485 struct ether_addr *mac; 3486 const char *macset = "0123456789abcdefABCDEF:"; 3487 3488 if (strcmp(p, "any") == 0) { 3489 for (i = 0; i < ETHER_ADDR_LEN; i++) 3490 addr[i] = mask[i] = 0; 3491 return; 3492 } 3493 3494 optr = ptr = strdup(p); 3495 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3496 l = strlen(ap); 3497 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3498 errx(EX_DATAERR, "Incorrect MAC address"); 3499 bcopy(mac, addr, ETHER_ADDR_LEN); 3500 } else 3501 errx(EX_DATAERR, "Incorrect MAC address"); 3502 3503 if (ptr != NULL) { /* we have mask? */ 3504 if (p[ptr - optr - 1] == '/') { /* mask len */ 3505 long ml = strtol(ptr, &ap, 10); 3506 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3507 errx(EX_DATAERR, "Incorrect mask length"); 3508 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3509 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3510 } else { /* mask */ 3511 l = strlen(ptr); 3512 if (strspn(ptr, macset) != l || 3513 (mac = ether_aton(ptr)) == NULL) 3514 errx(EX_DATAERR, "Incorrect mask"); 3515 bcopy(mac, mask, ETHER_ADDR_LEN); 3516 } 3517 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3518 for (i = 0; i < ETHER_ADDR_LEN; i++) 3519 mask[i] = 0xff; 3520 } 3521 for (i = 0; i < ETHER_ADDR_LEN; i++) 3522 addr[i] &= mask[i]; 3523 3524 free(optr); 3525 } 3526 3527 /* 3528 * helper function, updates the pointer to cmd with the length 3529 * of the current command, and also cleans up the first word of 3530 * the new command in case it has been clobbered before. 3531 */ 3532 static ipfw_insn * 3533 next_cmd(ipfw_insn *cmd, int *len) 3534 { 3535 *len -= F_LEN(cmd); 3536 CHECK_LENGTH(*len, 0); 3537 cmd += F_LEN(cmd); 3538 bzero(cmd, sizeof(*cmd)); 3539 return cmd; 3540 } 3541 3542 /* 3543 * Takes arguments and copies them into a comment 3544 */ 3545 static void 3546 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3547 { 3548 int i, l; 3549 char *p = (char *)(cmd + 1); 3550 3551 cmd->opcode = O_NOP; 3552 cmd->len = (cmd->len & (F_NOT | F_OR)); 3553 3554 /* Compute length of comment string. */ 3555 for (i = 0, l = 0; av[i] != NULL; i++) 3556 l += strlen(av[i]) + 1; 3557 if (l == 0) 3558 return; 3559 if (l > 84) 3560 errx(EX_DATAERR, 3561 "comment too long (max 80 chars)"); 3562 l = 1 + (l+3)/4; 3563 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3564 CHECK_CMDLEN; 3565 3566 for (i = 0; av[i] != NULL; i++) { 3567 strcpy(p, av[i]); 3568 p += strlen(av[i]); 3569 *p++ = ' '; 3570 } 3571 *(--p) = '\0'; 3572 } 3573 3574 /* 3575 * A function to fill simple commands of size 1. 3576 * Existing flags are preserved. 3577 */ 3578 static void 3579 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3580 { 3581 cmd->opcode = opcode; 3582 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3583 cmd->arg1 = arg; 3584 } 3585 3586 /* 3587 * Fetch and add the MAC address and type, with masks. This generates one or 3588 * two microinstructions, and returns the pointer to the last one. 3589 */ 3590 static ipfw_insn * 3591 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3592 { 3593 ipfw_insn_mac *mac; 3594 3595 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3596 errx(EX_DATAERR, "MAC dst src"); 3597 3598 cmd->opcode = O_MACADDR2; 3599 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3600 CHECK_CMDLEN; 3601 3602 mac = (ipfw_insn_mac *)cmd; 3603 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3604 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3605 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3606 return cmd; 3607 } 3608 3609 static ipfw_insn * 3610 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3611 { 3612 if (!av) 3613 errx(EX_DATAERR, "missing MAC type"); 3614 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3615 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3616 cblen); 3617 cmd->opcode = O_MAC_TYPE; 3618 return cmd; 3619 } else 3620 return NULL; 3621 } 3622 3623 static ipfw_insn * 3624 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3625 { 3626 struct protoent *pe; 3627 char *ep; 3628 int proto; 3629 3630 proto = strtol(av, &ep, 10); 3631 if (*ep != '\0' || proto <= 0) { 3632 if ((pe = getprotobyname(av)) == NULL) 3633 return NULL; 3634 proto = pe->p_proto; 3635 } 3636 3637 fill_cmd(cmd, O_PROTO, 0, proto); 3638 *protop = proto; 3639 return cmd; 3640 } 3641 3642 static ipfw_insn * 3643 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3644 { 3645 u_char proto = IPPROTO_IP; 3646 3647 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3648 ; /* do not set O_IP4 nor O_IP6 */ 3649 else if (strcmp(av, "ip4") == 0) 3650 /* explicit "just IPv4" rule */ 3651 fill_cmd(cmd, O_IP4, 0, 0); 3652 else if (strcmp(av, "ip6") == 0) { 3653 /* explicit "just IPv6" rule */ 3654 proto = IPPROTO_IPV6; 3655 fill_cmd(cmd, O_IP6, 0, 0); 3656 } else 3657 return add_proto0(cmd, av, protop); 3658 3659 *protop = proto; 3660 return cmd; 3661 } 3662 3663 static ipfw_insn * 3664 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3665 { 3666 u_char proto = IPPROTO_IP; 3667 3668 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3669 ; /* do not set O_IP4 nor O_IP6 */ 3670 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3671 /* explicit "just IPv4" rule */ 3672 fill_cmd(cmd, O_IP4, 0, 0); 3673 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3674 /* explicit "just IPv6" rule */ 3675 proto = IPPROTO_IPV6; 3676 fill_cmd(cmd, O_IP6, 0, 0); 3677 } else 3678 return add_proto0(cmd, av, protop); 3679 3680 *protop = proto; 3681 return cmd; 3682 } 3683 3684 static ipfw_insn * 3685 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3686 { 3687 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3688 if (cmd->opcode == O_IP_DST_SET) /* set */ 3689 cmd->opcode = O_IP_SRC_SET; 3690 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3691 cmd->opcode = O_IP_SRC_LOOKUP; 3692 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3693 cmd->opcode = O_IP_SRC_ME; 3694 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3695 cmd->opcode = O_IP_SRC; 3696 else /* addr/mask */ 3697 cmd->opcode = O_IP_SRC_MASK; 3698 return cmd; 3699 } 3700 3701 static ipfw_insn * 3702 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3703 { 3704 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3705 if (cmd->opcode == O_IP_DST_SET) /* set */ 3706 ; 3707 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3708 ; 3709 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3710 cmd->opcode = O_IP_DST_ME; 3711 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3712 cmd->opcode = O_IP_DST; 3713 else /* addr/mask */ 3714 cmd->opcode = O_IP_DST_MASK; 3715 return cmd; 3716 } 3717 3718 static ipfw_insn * 3719 add_srcmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3720 { 3721 3722 if (strncmp(av, "table(", 6) == 0) 3723 fill_table(cmd, av, O_MAC_SRC_LOOKUP, tstate); 3724 else 3725 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3726 return cmd; 3727 } 3728 3729 static ipfw_insn * 3730 add_dstmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3731 { 3732 3733 if (strncmp(av, "table(", 6) == 0) 3734 fill_table(cmd, av, O_MAC_DST_LOOKUP, tstate); 3735 else 3736 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3737 return cmd; 3738 } 3739 3740 3741 static struct _s_x f_reserved_keywords[] = { 3742 { "altq", TOK_OR }, 3743 { "//", TOK_OR }, 3744 { "diverted", TOK_OR }, 3745 { "dst-port", TOK_OR }, 3746 { "src-port", TOK_OR }, 3747 { "established", TOK_OR }, 3748 { "keep-state", TOK_OR }, 3749 { "frag", TOK_OR }, 3750 { "icmptypes", TOK_OR }, 3751 { "in", TOK_OR }, 3752 { "out", TOK_OR }, 3753 { "ip6", TOK_OR }, 3754 { "any", TOK_OR }, 3755 { "to", TOK_OR }, 3756 { "via", TOK_OR }, 3757 { "{", TOK_OR }, 3758 { NULL, 0 } /* terminator */ 3759 }; 3760 3761 static ipfw_insn * 3762 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3763 { 3764 3765 if (match_token(f_reserved_keywords, av) != -1) 3766 return (NULL); 3767 3768 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3769 /* XXX todo: check that we have a protocol with ports */ 3770 cmd->opcode = opcode; 3771 return cmd; 3772 } 3773 return NULL; 3774 } 3775 3776 static ipfw_insn * 3777 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3778 { 3779 struct in6_addr a; 3780 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3781 ipfw_insn *ret = NULL; 3782 size_t len; 3783 3784 /* Copy first address in set if needed */ 3785 if ((ch = strpbrk(av, "/,")) != NULL) { 3786 len = ch - av; 3787 strlcpy(buf, av, sizeof(buf)); 3788 if (len < sizeof(buf)) 3789 buf[len] = '\0'; 3790 host = buf; 3791 } else 3792 host = av; 3793 3794 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3795 inet_pton(AF_INET6, host, &a) == 1) 3796 ret = add_srcip6(cmd, av, cblen, tstate); 3797 /* XXX: should check for IPv4, not !IPv6 */ 3798 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3799 inet_pton(AF_INET6, host, &a) != 1)) 3800 ret = add_srcip(cmd, av, cblen, tstate); 3801 if (ret == NULL && strcmp(av, "any") != 0) 3802 ret = cmd; 3803 3804 return ret; 3805 } 3806 3807 static ipfw_insn * 3808 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3809 { 3810 struct in6_addr a; 3811 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3812 ipfw_insn *ret = NULL; 3813 size_t len; 3814 3815 /* Copy first address in set if needed */ 3816 if ((ch = strpbrk(av, "/,")) != NULL) { 3817 len = ch - av; 3818 strlcpy(buf, av, sizeof(buf)); 3819 if (len < sizeof(buf)) 3820 buf[len] = '\0'; 3821 host = buf; 3822 } else 3823 host = av; 3824 3825 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3826 inet_pton(AF_INET6, host, &a) == 1) 3827 ret = add_dstip6(cmd, av, cblen, tstate); 3828 /* XXX: should check for IPv4, not !IPv6 */ 3829 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3830 inet_pton(AF_INET6, host, &a) != 1)) 3831 ret = add_dstip(cmd, av, cblen, tstate); 3832 if (ret == NULL && strcmp(av, "any") != 0) 3833 ret = cmd; 3834 3835 return ret; 3836 } 3837 3838 /* 3839 * Parse arguments and assemble the microinstructions which make up a rule. 3840 * Rules are added into the 'rulebuf' and then copied in the correct order 3841 * into the actual rule. 3842 * 3843 * The syntax for a rule starts with the action, followed by 3844 * optional action parameters, and the various match patterns. 3845 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 3846 * (generated if the rule includes a keep-state option), then the 3847 * various match patterns, log/altq actions, and the actual action. 3848 * 3849 */ 3850 static void 3851 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 3852 { 3853 /* 3854 * rules are added into the 'rulebuf' and then copied in 3855 * the correct order into the actual rule. 3856 * Some things that need to go out of order (prob, action etc.) 3857 * go into actbuf[]. 3858 */ 3859 static uint32_t actbuf[255], cmdbuf[255]; 3860 int rblen, ablen, cblen; 3861 3862 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 3863 ipfw_insn *first_cmd; /* first match pattern */ 3864 3865 struct ip_fw_rule *rule; 3866 3867 /* 3868 * various flags used to record that we entered some fields. 3869 */ 3870 ipfw_insn *have_state = NULL; /* any state-related option */ 3871 int have_rstate = 0; 3872 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 3873 ipfw_insn *have_skipcmd = NULL; 3874 size_t len; 3875 3876 int i; 3877 3878 int open_par = 0; /* open parenthesis ( */ 3879 3880 /* proto is here because it is used to fetch ports */ 3881 u_char proto = IPPROTO_IP; /* default protocol */ 3882 3883 double match_prob = 1; /* match probability, default is always match */ 3884 3885 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 3886 bzero(cmdbuf, sizeof(cmdbuf)); 3887 bzero(rbuf, *rbufsize); 3888 3889 rule = (struct ip_fw_rule *)rbuf; 3890 cmd = (ipfw_insn *)cmdbuf; 3891 action = (ipfw_insn *)actbuf; 3892 3893 rblen = *rbufsize / sizeof(uint32_t); 3894 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 3895 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 3896 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 3897 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 3898 3899 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 3900 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 3901 3902 av++; 3903 3904 /* [rule N] -- Rule number optional */ 3905 if (av[0] && isdigit(**av)) { 3906 rule->rulenum = atoi(*av); 3907 av++; 3908 } 3909 3910 /* [set N] -- set number (0..RESVD_SET), optional */ 3911 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 3912 int set = strtoul(av[1], NULL, 10); 3913 if (set < 0 || set > RESVD_SET) 3914 errx(EX_DATAERR, "illegal set %s", av[1]); 3915 rule->set = set; 3916 tstate->set = set; 3917 av += 2; 3918 } 3919 3920 /* [prob D] -- match probability, optional */ 3921 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 3922 match_prob = strtod(av[1], NULL); 3923 3924 if (match_prob <= 0 || match_prob > 1) 3925 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 3926 av += 2; 3927 } 3928 3929 /* action -- mandatory */ 3930 NEED1("missing action"); 3931 i = match_token(rule_actions, *av); 3932 av++; 3933 action->len = 1; /* default */ 3934 CHECK_ACTLEN; 3935 switch(i) { 3936 case TOK_CHECKSTATE: 3937 have_state = action; 3938 action->opcode = O_CHECK_STATE; 3939 if (*av == NULL || 3940 match_token(rule_options, *av) == TOK_COMMENT) { 3941 action->arg1 = pack_object(tstate, 3942 default_state_name, IPFW_TLV_STATE_NAME); 3943 break; 3944 } 3945 if (*av[0] == ':') { 3946 if (strcmp(*av + 1, "any") == 0) 3947 action->arg1 = 0; 3948 else if (state_check_name(*av + 1) == 0) 3949 action->arg1 = pack_object(tstate, *av + 1, 3950 IPFW_TLV_STATE_NAME); 3951 else 3952 errx(EX_DATAERR, "Invalid state name %s", 3953 *av); 3954 av++; 3955 break; 3956 } 3957 errx(EX_DATAERR, "Invalid state name %s", *av); 3958 break; 3959 3960 case TOK_ABORT: 3961 action->opcode = O_REJECT; 3962 action->arg1 = ICMP_REJECT_ABORT; 3963 break; 3964 3965 case TOK_ABORT6: 3966 action->opcode = O_UNREACH6; 3967 action->arg1 = ICMP6_UNREACH_ABORT; 3968 break; 3969 3970 case TOK_ACCEPT: 3971 action->opcode = O_ACCEPT; 3972 break; 3973 3974 case TOK_DENY: 3975 action->opcode = O_DENY; 3976 action->arg1 = 0; 3977 break; 3978 3979 case TOK_REJECT: 3980 action->opcode = O_REJECT; 3981 action->arg1 = ICMP_UNREACH_HOST; 3982 break; 3983 3984 case TOK_RESET: 3985 action->opcode = O_REJECT; 3986 action->arg1 = ICMP_REJECT_RST; 3987 break; 3988 3989 case TOK_RESET6: 3990 action->opcode = O_UNREACH6; 3991 action->arg1 = ICMP6_UNREACH_RST; 3992 break; 3993 3994 case TOK_UNREACH: 3995 action->opcode = O_REJECT; 3996 NEED1("missing reject code"); 3997 fill_reject_code(&action->arg1, *av); 3998 av++; 3999 if (action->arg1 == ICMP_UNREACH_NEEDFRAG && isdigit(**av)) { 4000 uint16_t mtu; 4001 4002 mtu = strtoul(*av, NULL, 10); 4003 if (mtu < 68 || mtu >= IP_MAXPACKET) 4004 errx(EX_DATAERR, "illegal argument for %s", 4005 *(av - 1)); 4006 action->len = F_INSN_SIZE(ipfw_insn_u16); 4007 ((ipfw_insn_u16 *)action)->ports[0] = mtu; 4008 av++; 4009 } 4010 break; 4011 4012 case TOK_UNREACH6: 4013 action->opcode = O_UNREACH6; 4014 NEED1("missing unreach code"); 4015 fill_unreach6_code(&action->arg1, *av); 4016 av++; 4017 break; 4018 4019 case TOK_COUNT: 4020 action->opcode = O_COUNT; 4021 break; 4022 4023 case TOK_NAT: 4024 action->opcode = O_NAT; 4025 action->len = F_INSN_SIZE(ipfw_insn_nat); 4026 CHECK_ACTLEN; 4027 if (*av != NULL && _substrcmp(*av, "global") == 0) { 4028 action->arg1 = IP_FW_NAT44_GLOBAL; 4029 av++; 4030 break; 4031 } else 4032 goto chkarg; 4033 case TOK_QUEUE: 4034 action->opcode = O_QUEUE; 4035 goto chkarg; 4036 case TOK_PIPE: 4037 action->opcode = O_PIPE; 4038 goto chkarg; 4039 case TOK_SKIPTO: 4040 action->opcode = O_SKIPTO; 4041 goto chkarg; 4042 case TOK_NETGRAPH: 4043 action->opcode = O_NETGRAPH; 4044 goto chkarg; 4045 case TOK_NGTEE: 4046 action->opcode = O_NGTEE; 4047 goto chkarg; 4048 case TOK_DIVERT: 4049 action->opcode = O_DIVERT; 4050 goto chkarg; 4051 case TOK_TEE: 4052 action->opcode = O_TEE; 4053 goto chkarg; 4054 case TOK_CALL: 4055 action->opcode = O_CALLRETURN; 4056 chkarg: 4057 if (!av[0]) 4058 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 4059 if (isdigit(**av)) { 4060 action->arg1 = strtoul(*av, NULL, 10); 4061 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 4062 errx(EX_DATAERR, "illegal argument for %s", 4063 *(av - 1)); 4064 } else if (_substrcmp(*av, "tablearg") == 0) { 4065 action->arg1 = IP_FW_TARG; 4066 } else if (i == TOK_DIVERT || i == TOK_TEE) { 4067 struct servent *s; 4068 setservent(1); 4069 s = getservbyname(av[0], "divert"); 4070 if (s != NULL) 4071 action->arg1 = ntohs(s->s_port); 4072 else 4073 errx(EX_DATAERR, "illegal divert/tee port"); 4074 } else 4075 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 4076 av++; 4077 break; 4078 4079 case TOK_FORWARD: { 4080 /* 4081 * Locate the address-port separator (':' or ','). 4082 * Could be one of the following: 4083 * hostname:port 4084 * IPv4 a.b.c.d,port 4085 * IPv4 a.b.c.d:port 4086 * IPv6 w:x:y::z,port 4087 * IPv6 [w:x:y::z]:port 4088 */ 4089 struct sockaddr_storage result; 4090 struct addrinfo *res; 4091 char *s, *end; 4092 int family; 4093 u_short port_number = 0; 4094 4095 NEED1("missing forward address[:port]"); 4096 4097 if (strncmp(*av, "tablearg", 8) == 0 && 4098 ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':')) 4099 memcpy(++(*av), "0.0.0.0", 7); 4100 4101 /* 4102 * Are we an bracket-enclosed IPv6 address? 4103 */ 4104 if (strchr(*av, '[')) 4105 (*av)++; 4106 4107 /* 4108 * locate the address-port separator (':' or ',') 4109 */ 4110 s = strchr(*av, ','); 4111 if (s == NULL) { 4112 s = strchr(*av, ']'); 4113 /* Prevent erroneous parsing on brackets. */ 4114 if (s != NULL) 4115 *(s++) = '\0'; 4116 else 4117 s = *av; 4118 4119 /* Distinguish between IPv4:port and IPv6 cases. */ 4120 s = strchr(s, ':'); 4121 if (s && strchr(s+1, ':')) 4122 s = NULL; /* no port */ 4123 } 4124 4125 if (s != NULL) { 4126 /* Terminate host portion and set s to start of port. */ 4127 *(s++) = '\0'; 4128 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 4129 if (s == end) 4130 errx(EX_DATAERR, 4131 "illegal forwarding port ``%s''", s); 4132 port_number = (u_short)i; 4133 } 4134 4135 /* 4136 * Resolve the host name or address to a family and a 4137 * network representation of the address. 4138 */ 4139 if (getaddrinfo(*av, NULL, NULL, &res)) 4140 errx(EX_DATAERR, NULL); 4141 /* Just use the first host in the answer. */ 4142 family = res->ai_family; 4143 memcpy(&result, res->ai_addr, res->ai_addrlen); 4144 freeaddrinfo(res); 4145 4146 if (family == PF_INET) { 4147 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 4148 4149 action->opcode = O_FORWARD_IP; 4150 action->len = F_INSN_SIZE(ipfw_insn_sa); 4151 CHECK_ACTLEN; 4152 4153 /* 4154 * In the kernel we assume AF_INET and use only 4155 * sin_port and sin_addr. Remember to set sin_len as 4156 * the routing code seems to use it too. 4157 */ 4158 p->sa.sin_len = sizeof(struct sockaddr_in); 4159 p->sa.sin_family = AF_INET; 4160 p->sa.sin_port = port_number; 4161 p->sa.sin_addr.s_addr = 4162 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 4163 } else if (family == PF_INET6) { 4164 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 4165 4166 action->opcode = O_FORWARD_IP6; 4167 action->len = F_INSN_SIZE(ipfw_insn_sa6); 4168 CHECK_ACTLEN; 4169 4170 p->sa.sin6_len = sizeof(struct sockaddr_in6); 4171 p->sa.sin6_family = AF_INET6; 4172 p->sa.sin6_port = port_number; 4173 p->sa.sin6_flowinfo = 0; 4174 p->sa.sin6_scope_id = 4175 ((struct sockaddr_in6 *)&result)->sin6_scope_id; 4176 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 4177 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 4178 } else { 4179 errx(EX_DATAERR, "Invalid address family in forward action"); 4180 } 4181 av++; 4182 break; 4183 } 4184 case TOK_COMMENT: 4185 /* pretend it is a 'count' rule followed by the comment */ 4186 action->opcode = O_COUNT; 4187 av--; /* go back... */ 4188 break; 4189 4190 case TOK_SETFIB: 4191 { 4192 int numfibs; 4193 size_t intsize = sizeof(int); 4194 4195 action->opcode = O_SETFIB; 4196 NEED1("missing fib number"); 4197 if (_substrcmp(*av, "tablearg") == 0) { 4198 action->arg1 = IP_FW_TARG; 4199 } else { 4200 action->arg1 = strtoul(*av, NULL, 10); 4201 if (sysctlbyname("net.fibs", &numfibs, &intsize, 4202 NULL, 0) == -1) 4203 errx(EX_DATAERR, "fibs not supported.\n"); 4204 if (action->arg1 >= numfibs) /* Temporary */ 4205 errx(EX_DATAERR, "fib too large.\n"); 4206 /* Add high-order bit to fib to make room for tablearg*/ 4207 action->arg1 |= 0x8000; 4208 } 4209 av++; 4210 break; 4211 } 4212 4213 case TOK_SETDSCP: 4214 { 4215 int code; 4216 4217 action->opcode = O_SETDSCP; 4218 NEED1("missing DSCP code"); 4219 if (_substrcmp(*av, "tablearg") == 0) { 4220 action->arg1 = IP_FW_TARG; 4221 } else { 4222 if (isalpha(*av[0])) { 4223 if ((code = match_token(f_ipdscp, *av)) == -1) 4224 errx(EX_DATAERR, "Unknown DSCP code"); 4225 action->arg1 = code; 4226 } else 4227 action->arg1 = strtoul(*av, NULL, 10); 4228 /* 4229 * Add high-order bit to DSCP to make room 4230 * for tablearg 4231 */ 4232 action->arg1 |= 0x8000; 4233 } 4234 av++; 4235 break; 4236 } 4237 4238 case TOK_REASS: 4239 action->opcode = O_REASS; 4240 break; 4241 4242 case TOK_RETURN: 4243 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 4244 break; 4245 4246 case TOK_TCPSETMSS: { 4247 u_long mss; 4248 uint16_t idx; 4249 4250 idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION); 4251 if (idx == 0) 4252 errx(EX_DATAERR, "pack_object failed"); 4253 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4254 NEED1("Missing MSS value"); 4255 action = next_cmd(action, &ablen); 4256 action->len = 1; 4257 CHECK_ACTLEN; 4258 mss = strtoul(*av, NULL, 10); 4259 if (mss == 0 || mss > UINT16_MAX) 4260 errx(EX_USAGE, "invalid MSS value %s", *av); 4261 fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss); 4262 av++; 4263 break; 4264 } 4265 4266 default: 4267 av--; 4268 if (match_token(rule_eactions, *av) == -1) 4269 errx(EX_DATAERR, "invalid action %s\n", *av); 4270 /* 4271 * External actions support. 4272 * XXX: we support only syntax with instance name. 4273 * For known external actions (from rule_eactions list) 4274 * we can handle syntax directly. But with `eaction' 4275 * keyword we can use only `eaction <name> <instance>' 4276 * syntax. 4277 */ 4278 case TOK_EACTION: { 4279 uint16_t idx; 4280 4281 NEED1("Missing eaction name"); 4282 if (eaction_check_name(*av) != 0) 4283 errx(EX_DATAERR, "Invalid eaction name %s", *av); 4284 idx = pack_object(tstate, *av, IPFW_TLV_EACTION); 4285 if (idx == 0) 4286 errx(EX_DATAERR, "pack_object failed"); 4287 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4288 av++; 4289 NEED1("Missing eaction instance name"); 4290 action = next_cmd(action, &ablen); 4291 action->len = 1; 4292 CHECK_ACTLEN; 4293 if (eaction_check_name(*av) != 0) 4294 errx(EX_DATAERR, "Invalid eaction instance name %s", 4295 *av); 4296 /* 4297 * External action instance object has TLV type depended 4298 * from the external action name object index. Since we 4299 * currently don't know this index, use zero as TLV type. 4300 */ 4301 idx = pack_object(tstate, *av, 0); 4302 if (idx == 0) 4303 errx(EX_DATAERR, "pack_object failed"); 4304 fill_cmd(action, O_EXTERNAL_INSTANCE, 0, idx); 4305 av++; 4306 } 4307 } 4308 action = next_cmd(action, &ablen); 4309 4310 /* 4311 * [altq queuename] -- altq tag, optional 4312 * [log [logamount N]] -- log, optional 4313 * 4314 * If they exist, it go first in the cmdbuf, but then it is 4315 * skipped in the copy section to the end of the buffer. 4316 */ 4317 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 4318 av++; 4319 switch (i) { 4320 case TOK_LOG: 4321 { 4322 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 4323 int l; 4324 4325 if (have_log) 4326 errx(EX_DATAERR, 4327 "log cannot be specified more than once"); 4328 have_log = (ipfw_insn *)c; 4329 cmd->len = F_INSN_SIZE(ipfw_insn_log); 4330 CHECK_CMDLEN; 4331 cmd->opcode = O_LOG; 4332 if (av[0] && _substrcmp(*av, "logamount") == 0) { 4333 av++; 4334 NEED1("logamount requires argument"); 4335 l = atoi(*av); 4336 if (l < 0) 4337 errx(EX_DATAERR, 4338 "logamount must be positive"); 4339 c->max_log = l; 4340 av++; 4341 } else { 4342 len = sizeof(c->max_log); 4343 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 4344 &c->max_log, &len, NULL, 0) == -1) { 4345 if (g_co.test_only) { 4346 c->max_log = 0; 4347 break; 4348 } 4349 errx(1, "sysctlbyname(\"%s\")", 4350 "net.inet.ip.fw.verbose_limit"); 4351 } 4352 } 4353 } 4354 break; 4355 4356 #ifndef NO_ALTQ 4357 case TOK_ALTQ: 4358 { 4359 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 4360 4361 NEED1("missing altq queue name"); 4362 if (have_altq) 4363 errx(EX_DATAERR, 4364 "altq cannot be specified more than once"); 4365 have_altq = (ipfw_insn *)a; 4366 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 4367 CHECK_CMDLEN; 4368 cmd->opcode = O_ALTQ; 4369 a->qid = altq_name_to_qid(*av); 4370 av++; 4371 } 4372 break; 4373 #endif 4374 4375 case TOK_TAG: 4376 case TOK_UNTAG: { 4377 uint16_t tag; 4378 4379 if (have_tag) 4380 errx(EX_USAGE, "tag and untag cannot be " 4381 "specified more than once"); 4382 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 4383 rule_action_params); 4384 have_tag = cmd; 4385 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 4386 av++; 4387 break; 4388 } 4389 4390 default: 4391 abort(); 4392 } 4393 cmd = next_cmd(cmd, &cblen); 4394 } 4395 4396 if (have_state) { /* must be a check-state, we are done */ 4397 if (*av != NULL && 4398 match_token(rule_options, *av) == TOK_COMMENT) { 4399 /* check-state has a comment */ 4400 av++; 4401 fill_comment(cmd, av, cblen); 4402 cmd = next_cmd(cmd, &cblen); 4403 av[0] = NULL; 4404 } 4405 goto done; 4406 } 4407 4408 #define OR_START(target) \ 4409 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 4410 if (open_par) \ 4411 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 4412 prev = NULL; \ 4413 open_par = 1; \ 4414 if ( (av[0])[1] == '\0') { \ 4415 av++; \ 4416 } else \ 4417 (*av)++; \ 4418 } \ 4419 target: \ 4420 4421 4422 #define CLOSE_PAR \ 4423 if (open_par) { \ 4424 if (av[0] && ( \ 4425 strcmp(*av, ")") == 0 || \ 4426 strcmp(*av, "}") == 0)) { \ 4427 prev = NULL; \ 4428 open_par = 0; \ 4429 av++; \ 4430 } else \ 4431 errx(EX_USAGE, "missing \")\"\n"); \ 4432 } 4433 4434 #define NOT_BLOCK \ 4435 if (av[0] && _substrcmp(*av, "not") == 0) { \ 4436 if (cmd->len & F_NOT) \ 4437 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 4438 cmd->len |= F_NOT; \ 4439 av++; \ 4440 } 4441 4442 #define OR_BLOCK(target) \ 4443 if (av[0] && _substrcmp(*av, "or") == 0) { \ 4444 if (prev == NULL || open_par == 0) \ 4445 errx(EX_DATAERR, "invalid OR block"); \ 4446 prev->len |= F_OR; \ 4447 av++; \ 4448 goto target; \ 4449 } \ 4450 CLOSE_PAR; 4451 4452 first_cmd = cmd; 4453 4454 #if 0 4455 /* 4456 * MAC addresses, optional. 4457 * If we have this, we skip the part "proto from src to dst" 4458 * and jump straight to the option parsing. 4459 */ 4460 NOT_BLOCK; 4461 NEED1("missing protocol"); 4462 if (_substrcmp(*av, "MAC") == 0 || 4463 _substrcmp(*av, "mac") == 0) { 4464 av++; /* the "MAC" keyword */ 4465 add_mac(cmd, av); /* exits in case of errors */ 4466 cmd = next_cmd(cmd); 4467 av += 2; /* dst-mac and src-mac */ 4468 NOT_BLOCK; 4469 NEED1("missing mac type"); 4470 if (add_mactype(cmd, av[0])) 4471 cmd = next_cmd(cmd); 4472 av++; /* any or mac-type */ 4473 goto read_options; 4474 } 4475 #endif 4476 4477 /* 4478 * protocol, mandatory 4479 */ 4480 OR_START(get_proto); 4481 NOT_BLOCK; 4482 NEED1("missing protocol"); 4483 if (add_proto_compat(cmd, *av, &proto)) { 4484 av++; 4485 if (F_LEN(cmd) != 0) { 4486 prev = cmd; 4487 cmd = next_cmd(cmd, &cblen); 4488 } 4489 } else if (first_cmd != cmd) { 4490 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 4491 } else { 4492 rule->flags |= IPFW_RULE_JUSTOPTS; 4493 goto read_options; 4494 } 4495 OR_BLOCK(get_proto); 4496 4497 first_cmd = cmd; /* update pointer to use in compact form */ 4498 4499 /* 4500 * "from", mandatory 4501 */ 4502 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 4503 errx(EX_USAGE, "missing ``from''"); 4504 av++; 4505 4506 /* 4507 * source IP, mandatory 4508 */ 4509 OR_START(source_ip); 4510 NOT_BLOCK; /* optional "not" */ 4511 NEED1("missing source address"); 4512 if (add_src(cmd, *av, proto, cblen, tstate)) { 4513 av++; 4514 if (F_LEN(cmd) != 0) { /* ! any */ 4515 prev = cmd; 4516 cmd = next_cmd(cmd, &cblen); 4517 } 4518 } else 4519 errx(EX_USAGE, "bad source address %s", *av); 4520 OR_BLOCK(source_ip); 4521 4522 /* 4523 * source ports, optional 4524 */ 4525 NOT_BLOCK; /* optional "not" */ 4526 if ( av[0] != NULL ) { 4527 if (_substrcmp(*av, "any") == 0 || 4528 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4529 av++; 4530 if (F_LEN(cmd) != 0) 4531 cmd = next_cmd(cmd, &cblen); 4532 } 4533 } 4534 4535 /* 4536 * "to", mandatory 4537 */ 4538 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4539 errx(EX_USAGE, "missing ``to''"); 4540 av++; 4541 4542 /* 4543 * destination, mandatory 4544 */ 4545 OR_START(dest_ip); 4546 NOT_BLOCK; /* optional "not" */ 4547 NEED1("missing dst address"); 4548 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4549 av++; 4550 if (F_LEN(cmd) != 0) { /* ! any */ 4551 prev = cmd; 4552 cmd = next_cmd(cmd, &cblen); 4553 } 4554 } else 4555 errx( EX_USAGE, "bad destination address %s", *av); 4556 OR_BLOCK(dest_ip); 4557 4558 /* 4559 * dest. ports, optional 4560 */ 4561 NOT_BLOCK; /* optional "not" */ 4562 if (av[0]) { 4563 if (_substrcmp(*av, "any") == 0 || 4564 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4565 av++; 4566 if (F_LEN(cmd) != 0) 4567 cmd = next_cmd(cmd, &cblen); 4568 } 4569 } 4570 if (first_cmd == cmd) 4571 rule->flags |= IPFW_RULE_NOOPT; 4572 4573 read_options: 4574 prev = NULL; 4575 while ( av[0] != NULL ) { 4576 char *s; 4577 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4578 4579 s = *av; 4580 cmd32 = (ipfw_insn_u32 *)cmd; 4581 4582 if (*s == '!') { /* alternate syntax for NOT */ 4583 if (cmd->len & F_NOT) 4584 errx(EX_USAGE, "double \"not\" not allowed\n"); 4585 cmd->len = F_NOT; 4586 s++; 4587 } 4588 i = match_token(rule_options, s); 4589 av++; 4590 switch(i) { 4591 case TOK_NOT: 4592 if (cmd->len & F_NOT) 4593 errx(EX_USAGE, "double \"not\" not allowed\n"); 4594 cmd->len = F_NOT; 4595 break; 4596 4597 case TOK_OR: 4598 if (open_par == 0 || prev == NULL) 4599 errx(EX_USAGE, "invalid \"or\" block\n"); 4600 prev->len |= F_OR; 4601 break; 4602 4603 case TOK_STARTBRACE: 4604 if (open_par) 4605 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4606 open_par = 1; 4607 break; 4608 4609 case TOK_ENDBRACE: 4610 if (!open_par) 4611 errx(EX_USAGE, "+missing \")\"\n"); 4612 open_par = 0; 4613 prev = NULL; 4614 break; 4615 4616 case TOK_IN: 4617 fill_cmd(cmd, O_IN, 0, 0); 4618 break; 4619 4620 case TOK_OUT: 4621 cmd->len ^= F_NOT; /* toggle F_NOT */ 4622 fill_cmd(cmd, O_IN, 0, 0); 4623 break; 4624 4625 case TOK_DIVERTED: 4626 fill_cmd(cmd, O_DIVERTED, 0, 3); 4627 break; 4628 4629 case TOK_DIVERTEDLOOPBACK: 4630 fill_cmd(cmd, O_DIVERTED, 0, 1); 4631 break; 4632 4633 case TOK_DIVERTEDOUTPUT: 4634 fill_cmd(cmd, O_DIVERTED, 0, 2); 4635 break; 4636 4637 case TOK_FRAG: { 4638 uint32_t set = 0, clear = 0; 4639 4640 if (*av != NULL && fill_flags(f_ipoff, *av, NULL, 4641 &set, &clear) == 0) 4642 av++; 4643 else { 4644 /* 4645 * Compatibility: no argument after "frag" 4646 * keyword equals to "frag offset". 4647 */ 4648 set = 0x01; 4649 clear = 0; 4650 } 4651 fill_cmd(cmd, O_FRAG, 0, 4652 (set & 0xff) | ( (clear & 0xff) << 8)); 4653 break; 4654 } 4655 4656 case TOK_LAYER2: 4657 fill_cmd(cmd, O_LAYER2, 0, 0); 4658 break; 4659 4660 case TOK_XMIT: 4661 case TOK_RECV: 4662 case TOK_VIA: 4663 NEED1("recv, xmit, via require interface name" 4664 " or address"); 4665 fill_iface((ipfw_insn_if *)cmd, av[0], cblen, tstate); 4666 av++; 4667 if (F_LEN(cmd) == 0) /* not a valid address */ 4668 break; 4669 if (i == TOK_XMIT) 4670 cmd->opcode = O_XMIT; 4671 else if (i == TOK_RECV) 4672 cmd->opcode = O_RECV; 4673 else if (i == TOK_VIA) 4674 cmd->opcode = O_VIA; 4675 break; 4676 4677 case TOK_ICMPTYPES: 4678 NEED1("icmptypes requires list of types"); 4679 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 4680 av++; 4681 break; 4682 4683 case TOK_ICMP6TYPES: 4684 NEED1("icmptypes requires list of types"); 4685 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 4686 av++; 4687 break; 4688 4689 case TOK_IPTTL: 4690 NEED1("ipttl requires TTL"); 4691 if (strpbrk(*av, "-,")) { 4692 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 4693 errx(EX_DATAERR, "invalid ipttl %s", *av); 4694 } else 4695 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 4696 av++; 4697 break; 4698 4699 case TOK_IPID: 4700 NEED1("ipid requires id"); 4701 if (strpbrk(*av, "-,")) { 4702 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 4703 errx(EX_DATAERR, "invalid ipid %s", *av); 4704 } else 4705 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 4706 av++; 4707 break; 4708 4709 case TOK_IPLEN: 4710 NEED1("iplen requires length"); 4711 if (strpbrk(*av, "-,")) { 4712 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 4713 errx(EX_DATAERR, "invalid ip len %s", *av); 4714 } else 4715 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 4716 av++; 4717 break; 4718 4719 case TOK_IPVER: 4720 NEED1("ipver requires version"); 4721 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 4722 av++; 4723 break; 4724 4725 case TOK_IPPRECEDENCE: 4726 NEED1("ipprecedence requires value"); 4727 fill_cmd(cmd, O_IPPRECEDENCE, 0, 4728 (strtoul(*av, NULL, 0) & 7) << 5); 4729 av++; 4730 break; 4731 4732 case TOK_DSCP: 4733 NEED1("missing DSCP code"); 4734 fill_dscp(cmd, *av, cblen); 4735 av++; 4736 break; 4737 4738 case TOK_IPOPTS: 4739 NEED1("missing argument for ipoptions"); 4740 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 4741 av++; 4742 break; 4743 4744 case TOK_IPTOS: 4745 NEED1("missing argument for iptos"); 4746 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 4747 av++; 4748 break; 4749 4750 case TOK_UID: 4751 NEED1("uid requires argument"); 4752 { 4753 char *end; 4754 uid_t uid; 4755 struct passwd *pwd; 4756 4757 cmd->opcode = O_UID; 4758 uid = strtoul(*av, &end, 0); 4759 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 4760 if (pwd == NULL) 4761 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 4762 cmd32->d[0] = pwd->pw_uid; 4763 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4764 av++; 4765 } 4766 break; 4767 4768 case TOK_GID: 4769 NEED1("gid requires argument"); 4770 { 4771 char *end; 4772 gid_t gid; 4773 struct group *grp; 4774 4775 cmd->opcode = O_GID; 4776 gid = strtoul(*av, &end, 0); 4777 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 4778 if (grp == NULL) 4779 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 4780 cmd32->d[0] = grp->gr_gid; 4781 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4782 av++; 4783 } 4784 break; 4785 4786 case TOK_JAIL: 4787 NEED1("jail requires argument"); 4788 { 4789 char *end; 4790 int jid; 4791 4792 cmd->opcode = O_JAIL; 4793 /* 4794 * If av is a number, then we'll just pass it as-is. If 4795 * it's a name, try to resolve that to a jid. 4796 * 4797 * We save the jail_getid(3) call for a fallback because 4798 * it entails an unconditional trip to the kernel to 4799 * either validate a jid or resolve a name to a jid. 4800 * This specific token doesn't currently require a 4801 * jid to be an active jail, so we save a transition 4802 * by simply using a number that we're given. 4803 */ 4804 jid = strtoul(*av, &end, 10); 4805 if (*end != '\0') { 4806 jid = jail_getid(*av); 4807 if (jid < 0) 4808 errx(EX_DATAERR, "%s", jail_errmsg); 4809 } 4810 cmd32->d[0] = (uint32_t)jid; 4811 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4812 av++; 4813 } 4814 break; 4815 4816 case TOK_ESTAB: 4817 fill_cmd(cmd, O_ESTAB, 0, 0); 4818 break; 4819 4820 case TOK_SETUP: 4821 fill_cmd(cmd, O_TCPFLAGS, 0, 4822 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 4823 break; 4824 4825 case TOK_TCPDATALEN: 4826 NEED1("tcpdatalen requires length"); 4827 if (strpbrk(*av, "-,")) { 4828 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 4829 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 4830 } else 4831 fill_cmd(cmd, O_TCPDATALEN, 0, 4832 strtoul(*av, NULL, 0)); 4833 av++; 4834 break; 4835 4836 case TOK_TCPOPTS: 4837 NEED1("missing argument for tcpoptions"); 4838 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 4839 av++; 4840 break; 4841 4842 case TOK_TCPSEQ: 4843 case TOK_TCPACK: 4844 NEED1("tcpseq/tcpack requires argument"); 4845 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 4846 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 4847 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 4848 av++; 4849 break; 4850 4851 case TOK_TCPMSS: 4852 case TOK_TCPWIN: 4853 NEED1("tcpmss/tcpwin requires size"); 4854 if (strpbrk(*av, "-,")) { 4855 if (add_ports(cmd, *av, 0, 4856 i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS, 4857 cblen) == NULL) 4858 errx(EX_DATAERR, "invalid %s size %s", 4859 s, *av); 4860 } else 4861 fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN : 4862 O_TCPMSS, 0, strtoul(*av, NULL, 0)); 4863 av++; 4864 break; 4865 4866 case TOK_TCPFLAGS: 4867 NEED1("missing argument for tcpflags"); 4868 cmd->opcode = O_TCPFLAGS; 4869 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 4870 av++; 4871 break; 4872 4873 case TOK_KEEPSTATE: 4874 case TOK_RECORDSTATE: { 4875 uint16_t uidx; 4876 4877 if (open_par) 4878 errx(EX_USAGE, "keep-state or record-state cannot be part " 4879 "of an or block"); 4880 if (have_state) 4881 errx(EX_USAGE, "only one of keep-state, record-state, " 4882 " limit and set-limit is allowed"); 4883 if (*av != NULL && *av[0] == ':') { 4884 if (state_check_name(*av + 1) != 0) 4885 errx(EX_DATAERR, 4886 "Invalid state name %s", *av); 4887 uidx = pack_object(tstate, *av + 1, 4888 IPFW_TLV_STATE_NAME); 4889 av++; 4890 } else 4891 uidx = pack_object(tstate, default_state_name, 4892 IPFW_TLV_STATE_NAME); 4893 have_state = cmd; 4894 have_rstate = i == TOK_RECORDSTATE; 4895 fill_cmd(cmd, O_KEEP_STATE, 0, uidx); 4896 break; 4897 } 4898 4899 case TOK_LIMIT: 4900 case TOK_SETLIMIT: { 4901 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 4902 int val; 4903 4904 if (open_par) 4905 errx(EX_USAGE, 4906 "limit or set-limit cannot be part of an or block"); 4907 if (have_state) 4908 errx(EX_USAGE, "only one of keep-state, record-state, " 4909 " limit and set-limit is allowed"); 4910 have_state = cmd; 4911 have_rstate = i == TOK_SETLIMIT; 4912 4913 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 4914 CHECK_CMDLEN; 4915 cmd->opcode = O_LIMIT; 4916 c->limit_mask = c->conn_limit = 0; 4917 4918 while ( av[0] != NULL ) { 4919 if ((val = match_token(limit_masks, *av)) <= 0) 4920 break; 4921 c->limit_mask |= val; 4922 av++; 4923 } 4924 4925 if (c->limit_mask == 0) 4926 errx(EX_USAGE, "limit: missing limit mask"); 4927 4928 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 4929 TOK_LIMIT, rule_options); 4930 av++; 4931 4932 if (*av != NULL && *av[0] == ':') { 4933 if (state_check_name(*av + 1) != 0) 4934 errx(EX_DATAERR, 4935 "Invalid state name %s", *av); 4936 cmd->arg1 = pack_object(tstate, *av + 1, 4937 IPFW_TLV_STATE_NAME); 4938 av++; 4939 } else 4940 cmd->arg1 = pack_object(tstate, 4941 default_state_name, IPFW_TLV_STATE_NAME); 4942 break; 4943 } 4944 4945 case TOK_PROTO: 4946 NEED1("missing protocol"); 4947 if (add_proto(cmd, *av, &proto)) { 4948 av++; 4949 } else 4950 errx(EX_DATAERR, "invalid protocol ``%s''", 4951 *av); 4952 break; 4953 4954 case TOK_SRCIP: 4955 NEED1("missing source IP"); 4956 if (add_srcip(cmd, *av, cblen, tstate)) { 4957 av++; 4958 } 4959 break; 4960 4961 case TOK_DSTIP: 4962 NEED1("missing destination IP"); 4963 if (add_dstip(cmd, *av, cblen, tstate)) { 4964 av++; 4965 } 4966 break; 4967 4968 case TOK_SRCIP6: 4969 NEED1("missing source IP6"); 4970 if (add_srcip6(cmd, *av, cblen, tstate)) { 4971 av++; 4972 } 4973 break; 4974 4975 case TOK_DSTIP6: 4976 NEED1("missing destination IP6"); 4977 if (add_dstip6(cmd, *av, cblen, tstate)) { 4978 av++; 4979 } 4980 break; 4981 4982 4983 case TOK_SRCMAC: 4984 NEED1("missing source MAC"); 4985 if (add_srcmac(cmd, *av, tstate)) { 4986 av++; 4987 } 4988 break; 4989 4990 case TOK_DSTMAC: 4991 NEED1("missing destination MAC"); 4992 if (add_dstmac(cmd, *av, tstate)) { 4993 av++; 4994 } 4995 break; 4996 4997 case TOK_SRCPORT: 4998 NEED1("missing source port"); 4999 if (_substrcmp(*av, "any") == 0 || 5000 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 5001 av++; 5002 } else 5003 errx(EX_DATAERR, "invalid source port %s", *av); 5004 break; 5005 5006 case TOK_DSTPORT: 5007 NEED1("missing destination port"); 5008 if (_substrcmp(*av, "any") == 0 || 5009 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 5010 av++; 5011 } else 5012 errx(EX_DATAERR, "invalid destination port %s", 5013 *av); 5014 break; 5015 5016 case TOK_MAC: 5017 if (add_mac(cmd, av, cblen)) 5018 av += 2; 5019 break; 5020 5021 case TOK_MACTYPE: 5022 NEED1("missing mac type"); 5023 if (!add_mactype(cmd, *av, cblen)) 5024 errx(EX_DATAERR, "invalid mac type %s", *av); 5025 av++; 5026 break; 5027 5028 case TOK_VERREVPATH: 5029 fill_cmd(cmd, O_VERREVPATH, 0, 0); 5030 break; 5031 5032 case TOK_VERSRCREACH: 5033 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 5034 break; 5035 5036 case TOK_ANTISPOOF: 5037 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 5038 break; 5039 5040 case TOK_IPSEC: 5041 fill_cmd(cmd, O_IPSEC, 0, 0); 5042 break; 5043 5044 case TOK_IPV6: 5045 fill_cmd(cmd, O_IP6, 0, 0); 5046 break; 5047 5048 case TOK_IPV4: 5049 fill_cmd(cmd, O_IP4, 0, 0); 5050 break; 5051 5052 case TOK_EXT6HDR: 5053 NEED1("missing extension header"); 5054 fill_ext6hdr( cmd, *av ); 5055 av++; 5056 break; 5057 5058 case TOK_FLOWID: 5059 if (proto != IPPROTO_IPV6 ) 5060 errx( EX_USAGE, "flow-id filter is active " 5061 "only for ipv6 protocol\n"); 5062 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 5063 av++; 5064 break; 5065 5066 case TOK_COMMENT: 5067 fill_comment(cmd, av, cblen); 5068 av[0]=NULL; 5069 break; 5070 5071 case TOK_TAGGED: 5072 if (av[0] && strpbrk(*av, "-,")) { 5073 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 5074 errx(EX_DATAERR, "tagged: invalid tag" 5075 " list: %s", *av); 5076 } 5077 else { 5078 uint16_t tag; 5079 5080 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 5081 TOK_TAGGED, rule_options); 5082 fill_cmd(cmd, O_TAGGED, 0, tag); 5083 } 5084 av++; 5085 break; 5086 5087 case TOK_FIB: 5088 NEED1("fib requires fib number"); 5089 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 5090 av++; 5091 break; 5092 case TOK_SOCKARG: 5093 fill_cmd(cmd, O_SOCKARG, 0, 0); 5094 break; 5095 5096 case TOK_LOOKUP: { 5097 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 5098 5099 if (!av[0] || !av[1]) 5100 errx(EX_USAGE, "format: lookup argument tablenum"); 5101 cmd->opcode = O_IP_DST_LOOKUP; 5102 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 5103 i = match_token(lookup_keys, *av); 5104 if (i == -1) 5105 errx(EX_USAGE, "format: cannot lookup on %s", *av); 5106 __PAST_END(c->d, 1) = i; 5107 av++; 5108 5109 if ((i = pack_table(tstate, *av)) == 0) 5110 errx(EX_DATAERR, "Invalid table name: %s", *av); 5111 5112 cmd->arg1 = i; 5113 av++; 5114 } 5115 break; 5116 case TOK_FLOW: 5117 NEED1("missing table name"); 5118 if (strncmp(*av, "table(", 6) != 0) 5119 errx(EX_DATAERR, 5120 "enclose table name into \"table()\""); 5121 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 5122 av++; 5123 break; 5124 5125 case TOK_SKIPACTION: 5126 if (have_skipcmd) 5127 errx(EX_USAGE, "only one defer-action " 5128 "is allowed"); 5129 have_skipcmd = cmd; 5130 fill_cmd(cmd, O_SKIP_ACTION, 0, 0); 5131 break; 5132 5133 default: 5134 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 5135 } 5136 if (F_LEN(cmd) > 0) { /* prepare to advance */ 5137 prev = cmd; 5138 cmd = next_cmd(cmd, &cblen); 5139 } 5140 } 5141 5142 done: 5143 5144 if (!have_state && have_skipcmd) 5145 warnx("Rule contains \"defer-immediate-action\" " 5146 "and doesn't contain any state-related options."); 5147 5148 /* 5149 * Now copy stuff into the rule. 5150 * If we have a keep-state option, the first instruction 5151 * must be a PROBE_STATE (which is generated here). 5152 * If we have a LOG option, it was stored as the first command, 5153 * and now must be moved to the top of the action part. 5154 */ 5155 dst = (ipfw_insn *)rule->cmd; 5156 5157 /* 5158 * First thing to write into the command stream is the match probability. 5159 */ 5160 if (match_prob != 1) { /* 1 means always match */ 5161 dst->opcode = O_PROB; 5162 dst->len = 2; 5163 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 5164 dst += dst->len; 5165 } 5166 5167 /* 5168 * generate O_PROBE_STATE if necessary 5169 */ 5170 if (have_state && have_state->opcode != O_CHECK_STATE && !have_rstate) { 5171 fill_cmd(dst, O_PROBE_STATE, 0, have_state->arg1); 5172 dst = next_cmd(dst, &rblen); 5173 } 5174 5175 /* 5176 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG, 5177 * O_SKIP_ACTION 5178 */ 5179 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 5180 i = F_LEN(src); 5181 CHECK_RBUFLEN(i); 5182 5183 switch (src->opcode) { 5184 case O_LOG: 5185 case O_KEEP_STATE: 5186 case O_LIMIT: 5187 case O_ALTQ: 5188 case O_TAG: 5189 case O_SKIP_ACTION: 5190 break; 5191 default: 5192 bcopy(src, dst, i * sizeof(uint32_t)); 5193 dst += i; 5194 } 5195 } 5196 5197 /* 5198 * put back the have_state command as last opcode 5199 */ 5200 if (have_state && have_state->opcode != O_CHECK_STATE) { 5201 i = F_LEN(have_state); 5202 CHECK_RBUFLEN(i); 5203 bcopy(have_state, dst, i * sizeof(uint32_t)); 5204 dst += i; 5205 } 5206 5207 /* 5208 * put back the have_skipcmd command as very last opcode 5209 */ 5210 if (have_skipcmd) { 5211 i = F_LEN(have_skipcmd); 5212 CHECK_RBUFLEN(i); 5213 bcopy(have_skipcmd, dst, i * sizeof(uint32_t)); 5214 dst += i; 5215 } 5216 5217 /* 5218 * start action section 5219 */ 5220 rule->act_ofs = dst - rule->cmd; 5221 5222 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 5223 if (have_log) { 5224 i = F_LEN(have_log); 5225 CHECK_RBUFLEN(i); 5226 bcopy(have_log, dst, i * sizeof(uint32_t)); 5227 dst += i; 5228 } 5229 if (have_altq) { 5230 i = F_LEN(have_altq); 5231 CHECK_RBUFLEN(i); 5232 bcopy(have_altq, dst, i * sizeof(uint32_t)); 5233 dst += i; 5234 } 5235 if (have_tag) { 5236 i = F_LEN(have_tag); 5237 CHECK_RBUFLEN(i); 5238 bcopy(have_tag, dst, i * sizeof(uint32_t)); 5239 dst += i; 5240 } 5241 5242 /* 5243 * copy all other actions 5244 */ 5245 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 5246 i = F_LEN(src); 5247 CHECK_RBUFLEN(i); 5248 bcopy(src, dst, i * sizeof(uint32_t)); 5249 dst += i; 5250 } 5251 5252 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 5253 *rbufsize = (char *)dst - (char *)rule; 5254 } 5255 5256 static int 5257 compare_ntlv(const void *_a, const void *_b) 5258 { 5259 const ipfw_obj_ntlv *a, *b; 5260 5261 a = (const ipfw_obj_ntlv *)_a; 5262 b = (const ipfw_obj_ntlv *)_b; 5263 5264 if (a->set < b->set) 5265 return (-1); 5266 else if (a->set > b->set) 5267 return (1); 5268 5269 if (a->idx < b->idx) 5270 return (-1); 5271 else if (a->idx > b->idx) 5272 return (1); 5273 5274 if (a->head.type < b->head.type) 5275 return (-1); 5276 else if (a->head.type > b->head.type) 5277 return (1); 5278 5279 return (0); 5280 } 5281 5282 /* 5283 * Provide kernel with sorted list of referenced objects 5284 */ 5285 static void 5286 object_sort_ctlv(ipfw_obj_ctlv *ctlv) 5287 { 5288 5289 qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv); 5290 } 5291 5292 struct object_kt { 5293 uint16_t uidx; 5294 uint16_t type; 5295 }; 5296 static int 5297 compare_object_kntlv(const void *k, const void *v) 5298 { 5299 const ipfw_obj_ntlv *ntlv; 5300 struct object_kt key; 5301 5302 key = *((const struct object_kt *)k); 5303 ntlv = (const ipfw_obj_ntlv *)v; 5304 5305 if (key.uidx < ntlv->idx) 5306 return (-1); 5307 else if (key.uidx > ntlv->idx) 5308 return (1); 5309 5310 if (key.type < ntlv->head.type) 5311 return (-1); 5312 else if (key.type > ntlv->head.type) 5313 return (1); 5314 5315 return (0); 5316 } 5317 5318 /* 5319 * Finds object name in @ctlv by @idx and @type. 5320 * Uses the following facts: 5321 * 1) All TLVs are the same size 5322 * 2) Kernel implementation provides already sorted list. 5323 * 5324 * Returns table name or NULL. 5325 */ 5326 static char * 5327 object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, uint16_t type) 5328 { 5329 ipfw_obj_ntlv *ntlv; 5330 struct object_kt key; 5331 5332 key.uidx = idx; 5333 key.type = type; 5334 5335 ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize, 5336 compare_object_kntlv); 5337 5338 if (ntlv != NULL) 5339 return (ntlv->name); 5340 5341 return (NULL); 5342 } 5343 5344 static char * 5345 table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx) 5346 { 5347 5348 return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME)); 5349 } 5350 5351 /* 5352 * Adds one or more rules to ipfw chain. 5353 * Data layout: 5354 * Request: 5355 * [ 5356 * ip_fw3_opheader 5357 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 5358 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 5359 * ] 5360 * Reply: 5361 * [ 5362 * ip_fw3_opheader 5363 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 5364 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 5365 * ] 5366 * 5367 * Rules in reply are modified to store their actual ruleset number. 5368 * 5369 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 5370 * according to their idx field and there has to be no duplicates. 5371 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 5372 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 5373 */ 5374 void 5375 ipfw_add(char *av[]) 5376 { 5377 uint32_t rulebuf[1024]; 5378 int rbufsize, default_off, tlen, rlen; 5379 size_t sz; 5380 struct tidx ts; 5381 struct ip_fw_rule *rule; 5382 caddr_t tbuf; 5383 ip_fw3_opheader *op3; 5384 ipfw_obj_ctlv *ctlv, *tstate; 5385 5386 rbufsize = sizeof(rulebuf); 5387 memset(rulebuf, 0, rbufsize); 5388 memset(&ts, 0, sizeof(ts)); 5389 5390 /* Optimize case with no tables */ 5391 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 5392 op3 = (ip_fw3_opheader *)rulebuf; 5393 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5394 rule = (struct ip_fw_rule *)(ctlv + 1); 5395 rbufsize -= default_off; 5396 5397 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 5398 /* Align rule size to u64 boundary */ 5399 rlen = roundup2(rbufsize, sizeof(uint64_t)); 5400 5401 tbuf = NULL; 5402 sz = 0; 5403 tstate = NULL; 5404 if (ts.count != 0) { 5405 /* Some tables. We have to alloc more data */ 5406 tlen = ts.count * sizeof(ipfw_obj_ntlv); 5407 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 5408 5409 if ((tbuf = calloc(1, sz)) == NULL) 5410 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 5411 op3 = (ip_fw3_opheader *)tbuf; 5412 /* Tables first */ 5413 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5414 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 5415 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 5416 ctlv->count = ts.count; 5417 ctlv->objsize = sizeof(ipfw_obj_ntlv); 5418 memcpy(ctlv + 1, ts.idx, tlen); 5419 object_sort_ctlv(ctlv); 5420 tstate = ctlv; 5421 /* Rule next */ 5422 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 5423 ctlv->head.type = IPFW_TLV_RULE_LIST; 5424 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5425 ctlv->count = 1; 5426 memcpy(ctlv + 1, rule, rbufsize); 5427 } else { 5428 /* Simply add header */ 5429 sz = rlen + default_off; 5430 memset(ctlv, 0, sizeof(*ctlv)); 5431 ctlv->head.type = IPFW_TLV_RULE_LIST; 5432 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5433 ctlv->count = 1; 5434 } 5435 5436 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 5437 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 5438 5439 if (!g_co.do_quiet) { 5440 struct format_opts sfo; 5441 struct buf_pr bp; 5442 memset(&sfo, 0, sizeof(sfo)); 5443 sfo.tstate = tstate; 5444 sfo.set_mask = (uint32_t)(-1); 5445 bp_alloc(&bp, 4096); 5446 show_static_rule(&g_co, &sfo, &bp, rule, NULL); 5447 printf("%s", bp.buf); 5448 bp_free(&bp); 5449 } 5450 5451 if (tbuf != NULL) 5452 free(tbuf); 5453 5454 if (ts.idx != NULL) 5455 free(ts.idx); 5456 } 5457 5458 /* 5459 * clear the counters or the log counters. 5460 * optname has the following values: 5461 * 0 (zero both counters and logging) 5462 * 1 (zero logging only) 5463 */ 5464 void 5465 ipfw_zero(int ac, char *av[], int optname) 5466 { 5467 ipfw_range_tlv rt; 5468 char const *errstr; 5469 char const *name = optname ? "RESETLOG" : "ZERO"; 5470 uint32_t arg; 5471 int failed = EX_OK; 5472 5473 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 5474 av++; ac--; 5475 5476 if (ac == 0) { 5477 /* clear all entries */ 5478 memset(&rt, 0, sizeof(rt)); 5479 rt.flags = IPFW_RCFLAG_ALL; 5480 if (do_range_cmd(optname, &rt) < 0) 5481 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 5482 if (!g_co.do_quiet) 5483 printf("%s.\n", optname == IP_FW_XZERO ? 5484 "Accounting cleared":"Logging counts reset"); 5485 5486 return; 5487 } 5488 5489 while (ac) { 5490 /* Rule number */ 5491 if (isdigit(**av)) { 5492 arg = strtonum(*av, 0, 0xffff, &errstr); 5493 if (errstr) 5494 errx(EX_DATAERR, 5495 "invalid rule number %s\n", *av); 5496 memset(&rt, 0, sizeof(rt)); 5497 rt.start_rule = arg; 5498 rt.end_rule = arg; 5499 rt.flags |= IPFW_RCFLAG_RANGE; 5500 if (g_co.use_set != 0) { 5501 rt.set = g_co.use_set - 1; 5502 rt.flags |= IPFW_RCFLAG_SET; 5503 } 5504 if (do_range_cmd(optname, &rt) != 0) { 5505 warn("rule %u: setsockopt(IP_FW_X%s)", 5506 arg, name); 5507 failed = EX_UNAVAILABLE; 5508 } else if (rt.new_set == 0) { 5509 printf("Entry %d not found\n", arg); 5510 failed = EX_UNAVAILABLE; 5511 } else if (!g_co.do_quiet) 5512 printf("Entry %d %s.\n", arg, 5513 optname == IP_FW_XZERO ? 5514 "cleared" : "logging count reset"); 5515 } else { 5516 errx(EX_USAGE, "invalid rule number ``%s''", *av); 5517 } 5518 av++; ac--; 5519 } 5520 if (failed != EX_OK) 5521 exit(failed); 5522 } 5523 5524 void 5525 ipfw_flush(int force) 5526 { 5527 ipfw_range_tlv rt; 5528 5529 if (!force && !g_co.do_quiet) { /* need to ask user */ 5530 int c; 5531 5532 printf("Are you sure? [yn] "); 5533 fflush(stdout); 5534 do { 5535 c = toupper(getc(stdin)); 5536 while (c != '\n' && getc(stdin) != '\n') 5537 if (feof(stdin)) 5538 return; /* and do not flush */ 5539 } while (c != 'Y' && c != 'N'); 5540 printf("\n"); 5541 if (c == 'N') /* user said no */ 5542 return; 5543 } 5544 if (g_co.do_pipe) { 5545 dummynet_flush(); 5546 return; 5547 } 5548 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 5549 memset(&rt, 0, sizeof(rt)); 5550 if (g_co.use_set != 0) { 5551 rt.set = g_co.use_set - 1; 5552 rt.flags = IPFW_RCFLAG_SET; 5553 } else 5554 rt.flags = IPFW_RCFLAG_ALL; 5555 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 5556 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 5557 if (!g_co.do_quiet) 5558 printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules"); 5559 } 5560 5561 static struct _s_x intcmds[] = { 5562 { "talist", TOK_TALIST }, 5563 { "iflist", TOK_IFLIST }, 5564 { "olist", TOK_OLIST }, 5565 { "vlist", TOK_VLIST }, 5566 { NULL, 0 } 5567 }; 5568 5569 static struct _s_x otypes[] = { 5570 { "EACTION", IPFW_TLV_EACTION }, 5571 { "DYNSTATE", IPFW_TLV_STATE_NAME }, 5572 { NULL, 0 } 5573 }; 5574 5575 static const char* 5576 lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type) 5577 { 5578 const char *name; 5579 int i; 5580 5581 name = NULL; 5582 for (i = 0; i < cnt; i++) { 5583 if (ntlv[i].head.type != IPFW_TLV_EACTION) 5584 continue; 5585 if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type) 5586 continue; 5587 name = ntlv[i].name; 5588 break; 5589 } 5590 return (name); 5591 } 5592 5593 static void 5594 ipfw_list_objects(int ac __unused, char *av[] __unused) 5595 { 5596 ipfw_obj_lheader req, *olh; 5597 ipfw_obj_ntlv *ntlv; 5598 const char *name; 5599 size_t sz; 5600 uint32_t i; 5601 5602 memset(&req, 0, sizeof(req)); 5603 sz = sizeof(req); 5604 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0) 5605 if (errno != ENOMEM) 5606 return; 5607 5608 sz = req.size; 5609 if ((olh = calloc(1, sz)) == NULL) 5610 return; 5611 5612 olh->size = sz; 5613 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) { 5614 free(olh); 5615 return; 5616 } 5617 5618 if (olh->count > 0) 5619 printf("Objects list:\n"); 5620 else 5621 printf("There are no objects\n"); 5622 ntlv = (ipfw_obj_ntlv *)(olh + 1); 5623 for (i = 0; i < olh->count; i++) { 5624 name = match_value(otypes, ntlv->head.type); 5625 if (name == NULL) 5626 name = lookup_eaction_name( 5627 (ipfw_obj_ntlv *)(olh + 1), olh->count, 5628 ntlv->head.type); 5629 if (name == NULL) 5630 printf(" kidx: %4d\ttype: %10d\tname: %s\n", 5631 ntlv->idx, ntlv->head.type, ntlv->name); 5632 else 5633 printf(" kidx: %4d\ttype: %10s\tname: %s\n", 5634 ntlv->idx, name, ntlv->name); 5635 ntlv++; 5636 } 5637 free(olh); 5638 } 5639 5640 void 5641 ipfw_internal_handler(int ac, char *av[]) 5642 { 5643 int tcmd; 5644 5645 ac--; av++; 5646 NEED1("internal cmd required"); 5647 5648 if ((tcmd = match_token(intcmds, *av)) == -1) 5649 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 5650 5651 switch (tcmd) { 5652 case TOK_IFLIST: 5653 ipfw_list_tifaces(); 5654 break; 5655 case TOK_TALIST: 5656 ipfw_list_ta(ac, av); 5657 break; 5658 case TOK_OLIST: 5659 ipfw_list_objects(ac, av); 5660 break; 5661 case TOK_VLIST: 5662 ipfw_list_values(ac, av); 5663 break; 5664 } 5665 } 5666 5667 static int 5668 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 5669 { 5670 ipfw_obj_lheader req, *olh; 5671 size_t sz; 5672 5673 memset(&req, 0, sizeof(req)); 5674 sz = sizeof(req); 5675 5676 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 5677 if (errno != ENOMEM) 5678 return (errno); 5679 } 5680 5681 sz = req.size; 5682 if ((olh = calloc(1, sz)) == NULL) 5683 return (ENOMEM); 5684 5685 olh->size = sz; 5686 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 5687 free(olh); 5688 return (errno); 5689 } 5690 5691 *polh = olh; 5692 return (0); 5693 } 5694 5695 static int 5696 ifinfo_cmp(const void *a, const void *b) 5697 { 5698 const ipfw_iface_info *ia, *ib; 5699 5700 ia = (const ipfw_iface_info *)a; 5701 ib = (const ipfw_iface_info *)b; 5702 5703 return (stringnum_cmp(ia->ifname, ib->ifname)); 5704 } 5705 5706 /* 5707 * Retrieves table list from kernel, 5708 * optionally sorts it and calls requested function for each table. 5709 * Returns 0 on success. 5710 */ 5711 static void 5712 ipfw_list_tifaces(void) 5713 { 5714 ipfw_obj_lheader *olh = NULL; 5715 ipfw_iface_info *info; 5716 uint32_t i; 5717 int error; 5718 5719 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 5720 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 5721 5722 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 5723 5724 info = (ipfw_iface_info *)(olh + 1); 5725 for (i = 0; i < olh->count; i++) { 5726 if (info->flags & IPFW_IFFLAG_RESOLVED) 5727 printf("%s ifindex: %d refcount: %u changes: %u\n", 5728 info->ifname, info->ifindex, info->refcnt, 5729 info->gencnt); 5730 else 5731 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 5732 info->ifname, info->refcnt, info->gencnt); 5733 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 5734 } 5735 5736 free(olh); 5737 } 5738