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 21 #include <sys/types.h> 22 #include <sys/param.h> 23 #include <sys/socket.h> 24 #include <sys/sockio.h> 25 #include <sys/sysctl.h> 26 27 #include "ipfw2.h" 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <grp.h> 33 #include <jail.h> 34 #include <netdb.h> 35 #include <pwd.h> 36 #include <stdio.h> 37 #include <stdarg.h> 38 #include <stdint.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <sysexits.h> 42 #include <time.h> /* ctime */ 43 #include <timeconv.h> /* _long_to_time */ 44 #include <unistd.h> 45 #include <fcntl.h> 46 #include <stddef.h> /* offsetof */ 47 48 #include <net/ethernet.h> 49 #include <net/if.h> /* only IFNAMSIZ */ 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> /* only n_short, n_long */ 52 #include <netinet/ip.h> 53 #include <netinet/ip_icmp.h> 54 #include <netinet/ip_fw.h> 55 #include <netinet/tcp.h> 56 #include <arpa/inet.h> 57 58 struct cmdline_opts g_co; /* global options */ 59 60 struct format_opts { 61 int bcwidth; 62 int pcwidth; 63 int show_counters; 64 int show_time; /* show timestamp */ 65 uint32_t set_mask; /* enabled sets mask */ 66 uint32_t flags; /* request flags */ 67 uint32_t first; /* first rule to request */ 68 uint32_t last; /* last rule to request */ 69 uint32_t dcnt; /* number of dynamic states */ 70 ipfw_obj_ctlv *tstate; /* table state data */ 71 }; 72 73 int resvd_set_number = RESVD_SET; 74 75 static int ipfw_socket = -1; 76 77 #define CHECK_LENGTH(v, len) do { \ 78 if ((v) < (len)) \ 79 errx(EX_DATAERR, "Rule too long"); \ 80 } while (0) 81 /* 82 * Check if we have enough space in cmd buffer. Note that since 83 * first 8? u32 words are reserved by reserved header, full cmd 84 * buffer can't be used, so we need to protect from buffer overrun 85 * only. At the beginning, cblen is less than actual buffer size by 86 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need 87 * for checking small instructions fitting in given range. 88 * We also (ab)use the fact that ipfw_insn is always the first field 89 * for any custom instruction. 90 */ 91 #define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) 92 93 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 94 if (!av[0]) \ 95 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 96 if (_substrcmp(*av, "tablearg") == 0) { \ 97 arg = IP_FW_TARG; \ 98 break; \ 99 } \ 100 \ 101 { \ 102 long _xval; \ 103 char *end; \ 104 \ 105 _xval = strtol(*av, &end, 10); \ 106 \ 107 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 108 errx(EX_DATAERR, "%s: invalid argument: %s", \ 109 match_value(s_x, tok), *av); \ 110 \ 111 if (errno == ERANGE || _xval < min || _xval > max) \ 112 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 113 match_value(s_x, tok), min, max, *av); \ 114 \ 115 if (_xval == IP_FW_TARG) \ 116 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 117 match_value(s_x, tok), *av); \ 118 arg = _xval; \ 119 } \ 120 } while (0) 121 122 static struct _s_x f_tcpflags[] = { 123 { "syn", TH_SYN }, 124 { "fin", TH_FIN }, 125 { "ack", TH_ACK }, 126 { "psh", TH_PUSH }, 127 { "rst", TH_RST }, 128 { "urg", TH_URG }, 129 { "tcp flag", 0 }, 130 { NULL, 0 } 131 }; 132 133 static struct _s_x f_tcpopts[] = { 134 { "mss", IP_FW_TCPOPT_MSS }, 135 { "maxseg", IP_FW_TCPOPT_MSS }, 136 { "window", IP_FW_TCPOPT_WINDOW }, 137 { "sack", IP_FW_TCPOPT_SACK }, 138 { "ts", IP_FW_TCPOPT_TS }, 139 { "timestamp", IP_FW_TCPOPT_TS }, 140 { "cc", IP_FW_TCPOPT_CC }, 141 { "tcp option", 0 }, 142 { NULL, 0 } 143 }; 144 145 /* 146 * IP options span the range 0 to 255 so we need to remap them 147 * (though in fact only the low 5 bits are significant). 148 */ 149 static struct _s_x f_ipopts[] = { 150 { "ssrr", IP_FW_IPOPT_SSRR}, 151 { "lsrr", IP_FW_IPOPT_LSRR}, 152 { "rr", IP_FW_IPOPT_RR}, 153 { "ts", IP_FW_IPOPT_TS}, 154 { "ip option", 0 }, 155 { NULL, 0 } 156 }; 157 158 static struct _s_x f_iptos[] = { 159 { "lowdelay", IPTOS_LOWDELAY}, 160 { "throughput", IPTOS_THROUGHPUT}, 161 { "reliability", IPTOS_RELIABILITY}, 162 { "mincost", IPTOS_MINCOST}, 163 { "congestion", IPTOS_ECN_CE}, 164 { "ecntransport", IPTOS_ECN_ECT0}, 165 { "ip tos option", 0}, 166 { NULL, 0 } 167 }; 168 169 static struct _s_x f_ipoff[] = { 170 { "rf", IP_RF >> 8 }, 171 { "df", IP_DF >> 8 }, 172 { "mf", IP_MF >> 8 }, 173 { "offset", 0x1 }, 174 { NULL, 0} 175 }; 176 177 struct _s_x f_ipdscp[] = { 178 { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ 179 { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ 180 { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ 181 { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ 182 { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ 183 { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ 184 { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ 185 { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ 186 { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ 187 { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ 188 { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ 189 { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ 190 { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 191 { "va", IPTOS_DSCP_VA >> 2 }, /* 101100 */ 192 { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ 193 { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 194 { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ 195 { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ 196 { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ 197 { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ 198 { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ 199 { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ 200 { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ 201 { NULL, 0 } 202 }; 203 204 static struct _s_x limit_masks[] = { 205 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 206 {"src-addr", DYN_SRC_ADDR}, 207 {"src-port", DYN_SRC_PORT}, 208 {"dst-addr", DYN_DST_ADDR}, 209 {"dst-port", DYN_DST_PORT}, 210 {NULL, 0} 211 }; 212 213 /* 214 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 215 * This is only used in this code. 216 */ 217 #define IPPROTO_ETHERTYPE 0x1000 218 static struct _s_x ether_types[] = { 219 /* 220 * Note, we cannot use "-:&/" in the names because they are field 221 * separators in the type specifications. Also, we use s = NULL as 222 * end-delimiter, because a type of 0 can be legal. 223 */ 224 { "ip", 0x0800 }, 225 { "ipv4", 0x0800 }, 226 { "ipv6", 0x86dd }, 227 { "arp", 0x0806 }, 228 { "rarp", 0x8035 }, 229 { "vlan", 0x8100 }, 230 { "loop", 0x9000 }, 231 { "trail", 0x1000 }, 232 { "at", 0x809b }, 233 { "atalk", 0x809b }, 234 { "aarp", 0x80f3 }, 235 { "pppoe_disc", 0x8863 }, 236 { "pppoe_sess", 0x8864 }, 237 { "ipx_8022", 0x00E0 }, 238 { "ipx_8023", 0x0000 }, 239 { "ipx_ii", 0x8137 }, 240 { "ipx_snap", 0x8137 }, 241 { "ipx", 0x8137 }, 242 { "ns", 0x0600 }, 243 { NULL, 0 } 244 }; 245 246 static struct _s_x rule_eactions[] = { 247 { "nat64clat", TOK_NAT64CLAT }, 248 { "nat64lsn", TOK_NAT64LSN }, 249 { "nat64stl", TOK_NAT64STL }, 250 { "nptv6", TOK_NPTV6 }, 251 { "tcp-setmss", TOK_TCPSETMSS }, 252 { NULL, 0 } /* terminator */ 253 }; 254 255 static struct _s_x rule_actions[] = { 256 { "abort6", TOK_ABORT6 }, 257 { "abort", TOK_ABORT }, 258 { "accept", TOK_ACCEPT }, 259 { "pass", TOK_ACCEPT }, 260 { "allow", TOK_ACCEPT }, 261 { "permit", TOK_ACCEPT }, 262 { "count", TOK_COUNT }, 263 { "pipe", TOK_PIPE }, 264 { "queue", TOK_QUEUE }, 265 { "divert", TOK_DIVERT }, 266 { "tee", TOK_TEE }, 267 { "netgraph", TOK_NETGRAPH }, 268 { "ngtee", TOK_NGTEE }, 269 { "fwd", TOK_FORWARD }, 270 { "forward", TOK_FORWARD }, 271 { "skipto", TOK_SKIPTO }, 272 { "deny", TOK_DENY }, 273 { "drop", TOK_DENY }, 274 { "reject", TOK_REJECT }, 275 { "reset6", TOK_RESET6 }, 276 { "reset", TOK_RESET }, 277 { "unreach6", TOK_UNREACH6 }, 278 { "unreach", TOK_UNREACH }, 279 { "check-state", TOK_CHECKSTATE }, 280 { "//", TOK_COMMENT }, 281 { "nat", TOK_NAT }, 282 { "reass", TOK_REASS }, 283 { "setfib", TOK_SETFIB }, 284 { "setdscp", TOK_SETDSCP }, 285 { "call", TOK_CALL }, 286 { "return", TOK_RETURN }, 287 { "eaction", TOK_EACTION }, 288 { "tcp-setmss", TOK_TCPSETMSS }, 289 { "setmark", TOK_SETMARK }, 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 { "mark", LOOKUP_MARK }, 316 { NULL, 0 }, 317 }; 318 319 static struct _s_x rule_options[] = { 320 { "tagged", TOK_TAGGED }, 321 { "uid", TOK_UID }, 322 { "gid", TOK_GID }, 323 { "jail", TOK_JAIL }, 324 { "in", TOK_IN }, 325 { "limit", TOK_LIMIT }, 326 { "set-limit", TOK_SETLIMIT }, 327 { "keep-state", TOK_KEEPSTATE }, 328 { "record-state", TOK_RECORDSTATE }, 329 { "bridged", TOK_LAYER2 }, 330 { "layer2", TOK_LAYER2 }, 331 { "out", TOK_OUT }, 332 { "diverted", TOK_DIVERTED }, 333 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 334 { "diverted-output", TOK_DIVERTEDOUTPUT }, 335 { "xmit", TOK_XMIT }, 336 { "recv", TOK_RECV }, 337 { "via", TOK_VIA }, 338 { "fragment", TOK_FRAG }, 339 { "frag", TOK_FRAG }, 340 { "fib", TOK_FIB }, 341 { "ipoptions", TOK_IPOPTS }, 342 { "ipopts", TOK_IPOPTS }, 343 { "iplen", TOK_IPLEN }, 344 { "ipid", TOK_IPID }, 345 { "ipprecedence", TOK_IPPRECEDENCE }, 346 { "dscp", TOK_DSCP }, 347 { "iptos", TOK_IPTOS }, 348 { "ipttl", TOK_IPTTL }, 349 { "ipversion", TOK_IPVER }, 350 { "ipver", TOK_IPVER }, 351 { "estab", TOK_ESTAB }, 352 { "established", TOK_ESTAB }, 353 { "setup", TOK_SETUP }, 354 { "sockarg", TOK_SOCKARG }, 355 { "tcpdatalen", TOK_TCPDATALEN }, 356 { "tcpflags", TOK_TCPFLAGS }, 357 { "tcpflgs", TOK_TCPFLAGS }, 358 { "tcpmss", TOK_TCPMSS }, 359 { "tcpoptions", TOK_TCPOPTS }, 360 { "tcpopts", TOK_TCPOPTS }, 361 { "tcpseq", TOK_TCPSEQ }, 362 { "tcpack", TOK_TCPACK }, 363 { "tcpwin", TOK_TCPWIN }, 364 { "icmptype", TOK_ICMPTYPES }, 365 { "icmptypes", TOK_ICMPTYPES }, 366 { "dst-ip", TOK_DSTIP }, 367 { "src-ip", TOK_SRCIP }, 368 { "dst-port", TOK_DSTPORT }, 369 { "src-port", TOK_SRCPORT }, 370 { "dst-mac", TOK_DSTMAC }, 371 { "src-mac", TOK_SRCMAC }, 372 { "proto", TOK_PROTO }, 373 { "MAC", TOK_MAC }, 374 { "mac", TOK_MAC }, 375 { "mac-type", TOK_MACTYPE }, 376 { "verrevpath", TOK_VERREVPATH }, 377 { "versrcreach", TOK_VERSRCREACH }, 378 { "antispoof", TOK_ANTISPOOF }, 379 { "ipsec", TOK_IPSEC }, 380 { "icmp6type", TOK_ICMP6TYPES }, 381 { "icmp6types", TOK_ICMP6TYPES }, 382 { "ext6hdr", TOK_EXT6HDR }, 383 { "flow-id", TOK_FLOWID }, 384 { "ipv6", TOK_IPV6 }, 385 { "ip6", TOK_IPV6 }, 386 { "ipv4", TOK_IPV4 }, 387 { "ip4", TOK_IPV4 }, 388 { "dst-ipv6", TOK_DSTIP6 }, 389 { "dst-ip6", TOK_DSTIP6 }, 390 { "src-ipv6", TOK_SRCIP6 }, 391 { "src-ip6", TOK_SRCIP6 }, 392 { "lookup", TOK_LOOKUP }, 393 { "flow", TOK_FLOW }, 394 { "mark", TOK_MARK }, 395 { "defer-action", TOK_SKIPACTION }, 396 { "defer-immediate-action", TOK_SKIPACTION }, 397 { "//", TOK_COMMENT }, 398 399 { "not", TOK_NOT }, /* pseudo option */ 400 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 401 { "or", TOK_OR }, /* pseudo option */ 402 { "|", /* escape */ TOK_OR }, /* pseudo option */ 403 { "{", TOK_STARTBRACE }, /* pseudo option */ 404 { "(", TOK_STARTBRACE }, /* pseudo option */ 405 { "}", TOK_ENDBRACE }, /* pseudo option */ 406 { ")", TOK_ENDBRACE }, /* pseudo option */ 407 { NULL, 0 } /* terminator */ 408 }; 409 410 void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); 411 static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 412 ipfw_cfg_lheader **pcfg, size_t *psize); 413 static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 414 ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); 415 static void ipfw_list_tifaces(void); 416 417 struct tidx; 418 static uint16_t pack_object(struct tidx *tstate, const char *name, int otype); 419 static uint16_t pack_table(struct tidx *tstate, const char *name); 420 421 static char *table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx); 422 static void object_sort_ctlv(ipfw_obj_ctlv *ctlv); 423 static char *object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, 424 uint16_t type); 425 426 int 427 is_ipfw(void) 428 { 429 return (g_co.prog == cmdline_prog_ipfw); 430 } 431 432 /* 433 * Simple string buffer API. 434 * Used to simplify buffer passing between function and for 435 * transparent overrun handling. 436 */ 437 438 /* 439 * Allocates new buffer of given size @sz. 440 * 441 * Returns 0 on success. 442 */ 443 int 444 bp_alloc(struct buf_pr *b, size_t size) 445 { 446 memset(b, 0, sizeof(struct buf_pr)); 447 448 if ((b->buf = calloc(1, size)) == NULL) 449 return (ENOMEM); 450 451 b->ptr = b->buf; 452 b->size = size; 453 b->avail = b->size; 454 455 return (0); 456 } 457 458 void 459 bp_free(struct buf_pr *b) 460 { 461 462 free(b->buf); 463 } 464 465 /* 466 * Flushes buffer so new writer start from beginning. 467 */ 468 void 469 bp_flush(struct buf_pr *b) 470 { 471 472 b->ptr = b->buf; 473 b->avail = b->size; 474 b->buf[0] = '\0'; 475 } 476 477 /* 478 * Print message specified by @format and args. 479 * Automatically manage buffer space and transparently handle 480 * buffer overruns. 481 * 482 * Returns number of bytes that should have been printed. 483 */ 484 int 485 bprintf(struct buf_pr *b, const char *format, ...) 486 { 487 va_list args; 488 int i; 489 490 va_start(args, format); 491 492 i = vsnprintf(b->ptr, b->avail, format, args); 493 va_end(args); 494 495 if (i < 0 || (size_t)i > b->avail) { 496 /* Overflow or print error */ 497 b->avail = 0; 498 } else { 499 b->ptr += i; 500 b->avail -= i; 501 } 502 503 b->needed += i; 504 505 return (i); 506 } 507 508 /* 509 * Special values printer for tablearg-aware opcodes. 510 */ 511 void 512 bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) 513 { 514 515 if (str != NULL) 516 bprintf(bp, "%s", str); 517 if (arg == IP_FW_TARG) 518 bprintf(bp, "tablearg"); 519 else 520 bprintf(bp, "%u", arg); 521 } 522 523 /* 524 * Helper routine to print a possibly unaligned uint64_t on 525 * various platform. If width > 0, print the value with 526 * the desired width, followed by a space; 527 * otherwise, return the required width. 528 */ 529 int 530 pr_u64(struct buf_pr *b, void *pd, int width) 531 { 532 #ifdef TCC 533 #define U64_FMT "I64" 534 #else 535 #define U64_FMT "llu" 536 #endif 537 uint64_t u; 538 unsigned long long d; 539 540 bcopy (pd, &u, sizeof(u)); 541 d = u; 542 return (width > 0) ? 543 bprintf(b, "%*" U64_FMT " ", width, d) : 544 snprintf(NULL, 0, "%" U64_FMT, d) ; 545 #undef U64_FMT 546 } 547 548 549 void * 550 safe_calloc(size_t number, size_t size) 551 { 552 void *ret = calloc(number, size); 553 554 if (ret == NULL) 555 err(EX_OSERR, "calloc"); 556 return ret; 557 } 558 559 void * 560 safe_realloc(void *ptr, size_t size) 561 { 562 void *ret = realloc(ptr, size); 563 564 if (ret == NULL) 565 err(EX_OSERR, "realloc"); 566 return ret; 567 } 568 569 /* 570 * Compare things like interface or table names. 571 */ 572 int 573 stringnum_cmp(const char *a, const char *b) 574 { 575 int la, lb; 576 577 la = strlen(a); 578 lb = strlen(b); 579 580 if (la > lb) 581 return (1); 582 else if (la < lb) 583 return (-01); 584 585 return (strcmp(a, b)); 586 } 587 588 struct debug_header { 589 uint16_t cmd_type; 590 uint16_t spare1; 591 uint32_t opt_name; 592 uint32_t total_len; 593 uint32_t spare2; 594 }; 595 596 /* 597 * conditionally runs the command. 598 * Selected options or negative -> getsockopt 599 */ 600 int 601 do_cmd(int optname, void *optval, uintptr_t optlen) 602 { 603 int i; 604 605 if (g_co.debug_only) { 606 struct debug_header dbg = { 607 .cmd_type = 1, 608 .opt_name = optname, 609 .total_len = optlen + sizeof(struct debug_header), 610 }; 611 write(1, &dbg, sizeof(dbg)); 612 write(1, optval, optlen); 613 } 614 615 if (g_co.test_only) 616 return (0); 617 618 if (ipfw_socket == -1) 619 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 620 if (ipfw_socket < 0) 621 err(EX_UNAVAILABLE, "socket"); 622 623 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 624 optname == IP_FW_ADD || optname == IP_FW3 || 625 optname == IP_FW_NAT_GET_CONFIG || 626 optname < 0 || 627 optname == IP_FW_NAT_GET_LOG) { 628 if (optname < 0) 629 optname = -optname; 630 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 631 (socklen_t *)optlen); 632 } else { 633 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 634 } 635 return (i); 636 } 637 638 /* 639 * do_set3 - pass ipfw control cmd to kernel 640 * @optname: option name 641 * @optval: pointer to option data 642 * @optlen: option length 643 * 644 * Assumes op3 header is already embedded. 645 * Calls setsockopt() with IP_FW3 as kernel-visible opcode. 646 * Returns 0 on success or errno otherwise. 647 */ 648 int 649 do_set3(int optname, ip_fw3_opheader *op3, size_t optlen) 650 { 651 652 op3->opcode = optname; 653 654 if (g_co.debug_only) { 655 struct debug_header dbg = { 656 .cmd_type = 2, 657 .opt_name = optname, 658 .total_len = optlen, sizeof(struct debug_header), 659 }; 660 write(1, &dbg, sizeof(dbg)); 661 write(1, op3, optlen); 662 } 663 664 if (g_co.test_only) 665 return (0); 666 667 if (ipfw_socket == -1) 668 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 669 if (ipfw_socket < 0) 670 err(EX_UNAVAILABLE, "socket"); 671 672 673 return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen)); 674 } 675 676 /* 677 * do_get3 - pass ipfw control cmd to kernel 678 * @optname: option name 679 * @optval: pointer to option data 680 * @optlen: pointer to option length 681 * 682 * Assumes op3 header is already embedded. 683 * Calls getsockopt() with IP_FW3 as kernel-visible opcode. 684 * Returns 0 on success or errno otherwise. 685 */ 686 int 687 do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) 688 { 689 int error; 690 socklen_t len; 691 692 op3->opcode = optname; 693 694 if (g_co.debug_only) { 695 struct debug_header dbg = { 696 .cmd_type = 3, 697 .opt_name = optname, 698 .total_len = *optlen + sizeof(struct debug_header), 699 }; 700 write(1, &dbg, sizeof(dbg)); 701 write(1, op3, *optlen); 702 } 703 704 if (g_co.test_only) 705 return (0); 706 707 if (ipfw_socket == -1) 708 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 709 if (ipfw_socket < 0) 710 err(EX_UNAVAILABLE, "socket"); 711 712 713 len = *optlen; 714 error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, &len); 715 *optlen = len; 716 717 return (error); 718 } 719 720 /** 721 * match_token takes a table and a string, returns the value associated 722 * with the string (-1 in case of failure). 723 */ 724 int 725 match_token(struct _s_x *table, const char *string) 726 { 727 struct _s_x *pt; 728 uint i = strlen(string); 729 730 for (pt = table ; i && pt->s != NULL ; pt++) 731 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 732 return pt->x; 733 return (-1); 734 } 735 736 /** 737 * match_token_relaxed takes a table and a string, returns the value associated 738 * with the string for the best match. 739 * 740 * Returns: 741 * value from @table for matched records 742 * -1 for non-matched records 743 * -2 if more than one records match @string. 744 */ 745 int 746 match_token_relaxed(struct _s_x *table, const char *string) 747 { 748 struct _s_x *pt, *m; 749 int i, c; 750 751 i = strlen(string); 752 c = 0; 753 754 for (pt = table ; i != 0 && pt->s != NULL ; pt++) { 755 if (strncmp(pt->s, string, i) != 0) 756 continue; 757 m = pt; 758 c++; 759 } 760 761 if (c == 1) 762 return (m->x); 763 764 return (c > 0 ? -2: -1); 765 } 766 767 int 768 get_token(struct _s_x *table, const char *string, const char *errbase) 769 { 770 int tcmd; 771 772 if ((tcmd = match_token_relaxed(table, string)) < 0) 773 errx(EX_USAGE, "%s %s %s", 774 (tcmd == 0) ? "invalid" : "ambiguous", errbase, string); 775 776 return (tcmd); 777 } 778 779 /** 780 * match_value takes a table and a value, returns the string associated 781 * with the value (NULL in case of failure). 782 */ 783 char const * 784 match_value(struct _s_x *p, int value) 785 { 786 for (; p->s != NULL; p++) 787 if (p->x == value) 788 return p->s; 789 return NULL; 790 } 791 792 size_t 793 concat_tokens(char *buf, size_t bufsize, struct _s_x *table, 794 const char *delimiter) 795 { 796 struct _s_x *pt; 797 int l; 798 size_t sz; 799 800 for (sz = 0, pt = table ; pt->s != NULL; pt++) { 801 l = snprintf(buf + sz, bufsize - sz, "%s%s", 802 (sz == 0) ? "" : delimiter, pt->s); 803 sz += l; 804 bufsize += l; 805 if (sz > bufsize) 806 return (bufsize); 807 } 808 809 return (sz); 810 } 811 812 /* 813 * helper function to process a set of flags and set bits in the 814 * appropriate masks. 815 */ 816 int 817 fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set, 818 uint32_t *clear) 819 { 820 char *q; /* points to the separator */ 821 int val; 822 uint32_t *which; /* mask we are working on */ 823 824 while (p && *p) { 825 if (*p == '!') { 826 p++; 827 which = clear; 828 } else 829 which = set; 830 q = strchr(p, ','); 831 if (q) 832 *q++ = '\0'; 833 val = match_token(flags, p); 834 if (val <= 0) { 835 if (e != NULL) 836 *e = p; 837 return (-1); 838 } 839 *which |= (uint32_t)val; 840 p = q; 841 } 842 return (0); 843 } 844 845 void 846 print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set) 847 { 848 char const *comma = ""; 849 int i, l; 850 851 for (i = 0; list[i].x != 0; i++) { 852 if ((set & list[i].x) == 0) 853 continue; 854 855 set &= ~list[i].x; 856 l = snprintf(buf, sz, "%s%s", comma, list[i].s); 857 if (l < 0 || (size_t)l >= sz) 858 return; 859 comma = ","; 860 buf += l; 861 sz -=l; 862 } 863 } 864 865 /* 866 * _substrcmp takes two strings and returns 1 if they do not match, 867 * and 0 if they match exactly or the first string is a sub-string 868 * of the second. A warning is printed to stderr in the case that the 869 * first string is a sub-string of the second. 870 * 871 * This function will be removed in the future through the usual 872 * deprecation process. 873 */ 874 int 875 _substrcmp(const char *str1, const char* str2) 876 { 877 878 if (strncmp(str1, str2, strlen(str1)) != 0) 879 return 1; 880 881 if (strlen(str1) != strlen(str2)) 882 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 883 str1, str2); 884 return 0; 885 } 886 887 /* 888 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 889 * and 0 if they match exactly or the second string is a sub-string 890 * of the first. A warning is printed to stderr in the case that the 891 * first string does not match the third. 892 * 893 * This function exists to warn about the bizarre construction 894 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 895 * for "bytes". The problem is that in addition to accepting "by", 896 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 897 * other string beginning with "by". 898 * 899 * This function will be removed in the future through the usual 900 * deprecation process. 901 */ 902 int 903 _substrcmp2(const char *str1, const char* str2, const char* str3) 904 { 905 906 if (strncmp(str1, str2, strlen(str2)) != 0) 907 return 1; 908 909 if (strcmp(str1, str3) != 0) 910 warnx("DEPRECATED: '%s' matched '%s'", 911 str1, str3); 912 return 0; 913 } 914 915 /* 916 * prints one port, symbolic or numeric 917 */ 918 static void 919 print_port(struct buf_pr *bp, int proto, uint16_t port) 920 { 921 922 if (proto == IPPROTO_ETHERTYPE) { 923 char const *s; 924 925 if (g_co.do_resolv && (s = match_value(ether_types, port)) ) 926 bprintf(bp, "%s", s); 927 else 928 bprintf(bp, "0x%04x", port); 929 } else { 930 struct servent *se = NULL; 931 if (g_co.do_resolv) { 932 struct protoent *pe = getprotobynumber(proto); 933 934 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 935 } 936 if (se) 937 bprintf(bp, "%s", se->s_name); 938 else 939 bprintf(bp, "%d", port); 940 } 941 } 942 943 static struct _s_x _port_name[] = { 944 {"dst-port", O_IP_DSTPORT}, 945 {"src-port", O_IP_SRCPORT}, 946 {"ipid", O_IPID}, 947 {"iplen", O_IPLEN}, 948 {"ipttl", O_IPTTL}, 949 {"mac-type", O_MAC_TYPE}, 950 {"tcpdatalen", O_TCPDATALEN}, 951 {"tcpmss", O_TCPMSS}, 952 {"tcpwin", O_TCPWIN}, 953 {"tagged", O_TAGGED}, 954 {NULL, 0} 955 }; 956 957 /* 958 * Print the values in a list 16-bit items of the types above. 959 * XXX todo: add support for mask. 960 */ 961 static void 962 print_newports(struct buf_pr *bp, const ipfw_insn_u16 *cmd, int proto, int opcode) 963 { 964 const uint16_t *p = cmd->ports; 965 int i; 966 char const *sep; 967 968 if (opcode != 0) { 969 sep = match_value(_port_name, opcode); 970 if (sep == NULL) 971 sep = "???"; 972 bprintf(bp, " %s", sep); 973 } 974 sep = " "; 975 for (i = F_LEN((const ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 976 bprintf(bp, "%s", sep); 977 print_port(bp, proto, p[0]); 978 if (p[0] != p[1]) { 979 bprintf(bp, "-"); 980 print_port(bp, proto, p[1]); 981 } 982 sep = ","; 983 } 984 } 985 986 /* 987 * Like strtol, but also translates service names into port numbers 988 * for some protocols. 989 * In particular: 990 * proto == -1 disables the protocol check; 991 * proto == IPPROTO_ETHERTYPE looks up an internal table 992 * proto == <some value in /etc/protocols> matches the values there. 993 * Returns *end == s in case the parameter is not found. 994 */ 995 static int 996 strtoport(char *s, char **end, int base, int proto) 997 { 998 char *p, *buf; 999 char *s1; 1000 int i; 1001 1002 *end = s; /* default - not found */ 1003 if (*s == '\0') 1004 return 0; /* not found */ 1005 1006 if (isdigit(*s)) 1007 return strtol(s, end, base); 1008 1009 /* 1010 * find separator. '\\' escapes the next char. 1011 */ 1012 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\' || 1013 *s1 == '_' || *s1 == '.') ; s1++) 1014 if (*s1 == '\\' && s1[1] != '\0') 1015 s1++; 1016 1017 buf = safe_calloc(s1 - s + 1, 1); 1018 1019 /* 1020 * copy into a buffer skipping backslashes 1021 */ 1022 for (p = s, i = 0; p != s1 ; p++) 1023 if (*p != '\\') 1024 buf[i++] = *p; 1025 buf[i++] = '\0'; 1026 1027 if (proto == IPPROTO_ETHERTYPE) { 1028 i = match_token(ether_types, buf); 1029 free(buf); 1030 if (i != -1) { /* found */ 1031 *end = s1; 1032 return i; 1033 } 1034 } else { 1035 struct protoent *pe = NULL; 1036 struct servent *se; 1037 1038 if (proto != 0) 1039 pe = getprotobynumber(proto); 1040 setservent(1); 1041 se = getservbyname(buf, pe ? pe->p_name : NULL); 1042 free(buf); 1043 if (se != NULL) { 1044 *end = s1; 1045 return ntohs(se->s_port); 1046 } 1047 } 1048 return 0; /* not found */ 1049 } 1050 1051 /* 1052 * Fill the body of the command with the list of port ranges. 1053 */ 1054 static int 1055 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 1056 { 1057 uint16_t a, b, *p = cmd->ports; 1058 int i = 0; 1059 char *s = av; 1060 1061 while (*s) { 1062 a = strtoport(av, &s, 0, proto); 1063 if (s == av) /* empty or invalid argument */ 1064 return (0); 1065 1066 CHECK_LENGTH(cblen, i + 2); 1067 1068 switch (*s) { 1069 case '-': /* a range */ 1070 av = s + 1; 1071 b = strtoport(av, &s, 0, proto); 1072 /* Reject expressions like '1-abc' or '1-2-3'. */ 1073 if (s == av || (*s != ',' && *s != '\0')) 1074 return (0); 1075 p[0] = a; 1076 p[1] = b; 1077 break; 1078 case ',': /* comma separated list */ 1079 case '\0': 1080 p[0] = p[1] = a; 1081 break; 1082 default: 1083 warnx("port list: invalid separator <%c> in <%s>", 1084 *s, av); 1085 return (0); 1086 } 1087 1088 i++; 1089 p += 2; 1090 av = s + 1; 1091 } 1092 if (i > 0) { 1093 if (i + 1 > F_LEN_MASK) 1094 errx(EX_DATAERR, "too many ports/ranges\n"); 1095 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 1096 } 1097 return (i); 1098 } 1099 1100 /* 1101 * Fill the body of the command with the list of DiffServ codepoints. 1102 */ 1103 static void 1104 fill_dscp(ipfw_insn *cmd, char *av, int cblen) 1105 { 1106 uint32_t *low, *high; 1107 char *s = av, *a; 1108 int code; 1109 1110 cmd->opcode = O_DSCP; 1111 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1112 1113 CHECK_CMDLEN; 1114 1115 low = (uint32_t *)(cmd + 1); 1116 high = low + 1; 1117 1118 *low = 0; 1119 *high = 0; 1120 1121 while (s != NULL) { 1122 a = strchr(s, ','); 1123 1124 if (a != NULL) 1125 *a++ = '\0'; 1126 1127 if (isalpha(*s)) { 1128 if ((code = match_token(f_ipdscp, s)) == -1) 1129 errx(EX_DATAERR, "Unknown DSCP code"); 1130 } else { 1131 code = strtoul(s, NULL, 10); 1132 if (code < 0 || code > 63) 1133 errx(EX_DATAERR, "Invalid DSCP value"); 1134 } 1135 1136 if (code >= 32) 1137 *high |= 1 << (code - 32); 1138 else 1139 *low |= 1 << code; 1140 1141 s = a; 1142 } 1143 } 1144 1145 /* 1146 * Fill the body of the command with mark value and mask. 1147 */ 1148 static void 1149 fill_mark(ipfw_insn *cmd, char *av, int cblen) 1150 { 1151 uint32_t *value, *mask; 1152 char *value_str; 1153 1154 cmd->opcode = O_MARK; 1155 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1156 1157 CHECK_CMDLEN; 1158 1159 value = (uint32_t *)(cmd + 1); 1160 mask = value + 1; 1161 1162 value_str = strsep(&av, ":"); 1163 1164 if (strcmp(value_str, "tablearg") == 0) { 1165 cmd->arg1 = IP_FW_TARG; 1166 *value = 0; 1167 } else { 1168 /* This is not a tablearg */ 1169 cmd->arg1 |= 0x8000; 1170 *value = strtoul(value_str, NULL, 0); 1171 } 1172 if (av) 1173 *mask = strtoul(av, NULL, 0); 1174 else 1175 *mask = 0xFFFFFFFF; 1176 1177 if ((*value & *mask) != *value) 1178 errx(EX_DATAERR, "Static mark value: some bits in value are" 1179 " set that will be masked out by mask " 1180 "(%#x & %#x) = %#x != %#x", 1181 *value, *mask, (*value & *mask), *value); 1182 } 1183 1184 static struct _s_x icmpcodes[] = { 1185 { "net", ICMP_UNREACH_NET }, 1186 { "host", ICMP_UNREACH_HOST }, 1187 { "protocol", ICMP_UNREACH_PROTOCOL }, 1188 { "port", ICMP_UNREACH_PORT }, 1189 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 1190 { "srcfail", ICMP_UNREACH_SRCFAIL }, 1191 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 1192 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 1193 { "isolated", ICMP_UNREACH_ISOLATED }, 1194 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 1195 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 1196 { "tosnet", ICMP_UNREACH_TOSNET }, 1197 { "toshost", ICMP_UNREACH_TOSHOST }, 1198 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 1199 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 1200 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 1201 { NULL, 0 } 1202 }; 1203 1204 static uint16_t 1205 get_reject_code(const char *str) 1206 { 1207 int val; 1208 char *s; 1209 1210 val = strtoul(str, &s, 0); 1211 if (s == str || *s != '\0' || val >= 0x100) 1212 val = match_token(icmpcodes, str); 1213 if (val < 0) 1214 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 1215 return (val); 1216 } 1217 1218 static void 1219 print_reject_code(struct buf_pr *bp, uint16_t code) 1220 { 1221 char const *s; 1222 1223 if ((s = match_value(icmpcodes, code)) != NULL) 1224 bprintf(bp, "unreach %s", s); 1225 else 1226 bprintf(bp, "unreach %u", code); 1227 } 1228 1229 /* 1230 * Returns the number of bits set (from left) in a contiguous bitmask, 1231 * or -1 if the mask is not contiguous. 1232 * XXX this needs a proper fix. 1233 * This effectively works on masks in big-endian (network) format. 1234 * when compiled on little endian architectures. 1235 * 1236 * First bit is bit 7 of the first byte -- note, for MAC addresses, 1237 * the first bit on the wire is bit 0 of the first byte. 1238 * len is the max length in bits. 1239 */ 1240 int 1241 contigmask(const uint8_t *p, int len) 1242 { 1243 int i, n; 1244 1245 for (i=0; i<len ; i++) 1246 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 1247 break; 1248 for (n=i+1; n < len; n++) 1249 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 1250 return -1; /* mask not contiguous */ 1251 return i; 1252 } 1253 1254 /* 1255 * print flags set/clear in the two bitmasks passed as parameters. 1256 * There is a specialized check for f_tcpflags. 1257 */ 1258 static void 1259 print_flags(struct buf_pr *bp, char const *name, const ipfw_insn *cmd, 1260 struct _s_x *list) 1261 { 1262 char const *comma = ""; 1263 int i; 1264 uint8_t set = cmd->arg1 & 0xff; 1265 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 1266 1267 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 1268 bprintf(bp, " setup"); 1269 return; 1270 } 1271 1272 bprintf(bp, " %s ", name); 1273 for (i=0; list[i].x != 0; i++) { 1274 if (set & list[i].x) { 1275 set &= ~list[i].x; 1276 bprintf(bp, "%s%s", comma, list[i].s); 1277 comma = ","; 1278 } 1279 if (clear & list[i].x) { 1280 clear &= ~list[i].x; 1281 bprintf(bp, "%s!%s", comma, list[i].s); 1282 comma = ","; 1283 } 1284 } 1285 } 1286 1287 1288 /* 1289 * Print the ip address contained in a command. 1290 */ 1291 static void 1292 print_ip(struct buf_pr *bp, const struct format_opts *fo, 1293 const ipfw_insn_ip *cmd) 1294 { 1295 struct hostent *he = NULL; 1296 const struct in_addr *ia; 1297 const uint32_t *a = ((const ipfw_insn_u32 *)cmd)->d; 1298 uint32_t len = F_LEN((const ipfw_insn *)cmd); 1299 char *t; 1300 1301 bprintf(bp, " "); 1302 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 1303 const char *arg; 1304 1305 arg = match_value(lookup_keys, a[1]); 1306 t = table_search_ctlv(fo->tstate, 1307 ((const ipfw_insn *)cmd)->arg1); 1308 bprintf(bp, "lookup %s %s", arg, t); 1309 return; 1310 } 1311 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 1312 bprintf(bp, "me"); 1313 return; 1314 } 1315 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 1316 cmd->o.opcode == O_IP_DST_LOOKUP) { 1317 t = table_search_ctlv(fo->tstate, 1318 ((const ipfw_insn *)cmd)->arg1); 1319 bprintf(bp, "table(%s", t); 1320 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1321 bprintf(bp, ",%u", *a); 1322 bprintf(bp, ")"); 1323 return; 1324 } 1325 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 1326 const uint32_t *map = (const uint32_t *)&cmd->mask; 1327 struct in_addr addr; 1328 uint32_t x; 1329 int i, j; 1330 char comma = '{'; 1331 1332 x = cmd->o.arg1 - 1; 1333 x = htonl(~x); 1334 addr.s_addr = htonl(cmd->addr.s_addr); 1335 bprintf(bp, "%s/%d", inet_ntoa(addr), 1336 contigmask((uint8_t *)&x, 32)); 1337 x = cmd->addr.s_addr; 1338 x &= 0xff; /* base */ 1339 /* 1340 * Print bits and ranges. 1341 * Locate first bit set (i), then locate first bit unset (j). 1342 * If we have 3+ consecutive bits set, then print them as a 1343 * range, otherwise only print the initial bit and rescan. 1344 */ 1345 for (i=0; i < cmd->o.arg1; i++) 1346 if (map[i/32] & (1<<(i & 31))) { 1347 for (j=i+1; j < cmd->o.arg1; j++) 1348 if (!(map[ j/32] & (1<<(j & 31)))) 1349 break; 1350 bprintf(bp, "%c%d", comma, i+x); 1351 if (j>i+2) { /* range has at least 3 elements */ 1352 bprintf(bp, "-%d", j-1+x); 1353 i = j-1; 1354 } 1355 comma = ','; 1356 } 1357 bprintf(bp, "}"); 1358 return; 1359 } 1360 /* 1361 * len == 2 indicates a single IP, whereas lists of 1 or more 1362 * addr/mask pairs have len = (2n+1). We convert len to n so we 1363 * use that to count the number of entries. 1364 */ 1365 for (len = len / 2; len > 0; len--, a += 2) { 1366 int mb = /* mask length */ 1367 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 1368 32 : contigmask((const uint8_t *)&(a[1]), 32); 1369 if (mb == 32 && g_co.do_resolv) 1370 he = gethostbyaddr((const char *)&(a[0]), sizeof(in_addr_t), 1371 AF_INET); 1372 if (he != NULL) /* resolved to name */ 1373 bprintf(bp, "%s", he->h_name); 1374 else if (mb == 0) /* any */ 1375 bprintf(bp, "any"); 1376 else { /* numeric IP followed by some kind of mask */ 1377 ia = (const struct in_addr *)&a[0]; 1378 bprintf(bp, "%s", inet_ntoa(*ia)); 1379 if (mb < 0) { 1380 ia = (const struct in_addr *)&a[1]; 1381 bprintf(bp, ":%s", inet_ntoa(*ia)); 1382 } else if (mb < 32) 1383 bprintf(bp, "/%d", mb); 1384 } 1385 if (len > 1) 1386 bprintf(bp, ","); 1387 } 1388 } 1389 1390 /* 1391 * prints a MAC address/mask pair 1392 */ 1393 static void 1394 format_mac(struct buf_pr *bp, const uint8_t *addr, const uint8_t *mask) 1395 { 1396 int l = contigmask(mask, 48); 1397 1398 if (l == 0) 1399 bprintf(bp, " any"); 1400 else { 1401 bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", 1402 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1403 if (l == -1) 1404 bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", 1405 mask[0], mask[1], mask[2], 1406 mask[3], mask[4], mask[5]); 1407 else if (l < 48) 1408 bprintf(bp, "/%d", l); 1409 } 1410 } 1411 1412 static void 1413 print_mac(struct buf_pr *bp, const ipfw_insn_mac *mac) 1414 { 1415 1416 bprintf(bp, " MAC"); 1417 format_mac(bp, mac->addr, mac->mask); 1418 format_mac(bp, mac->addr + 6, mac->mask + 6); 1419 } 1420 1421 static void 1422 print_mac_lookup(struct buf_pr *bp, const struct format_opts *fo, 1423 const ipfw_insn *cmd) 1424 { 1425 uint32_t len = F_LEN(cmd); 1426 char *t; 1427 1428 bprintf(bp, " "); 1429 1430 t = table_search_ctlv(fo->tstate, cmd->arg1); 1431 bprintf(bp, "table(%s", t); 1432 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1433 bprintf(bp, ",%u", ((const ipfw_insn_u32 *)cmd)->d[0]); 1434 bprintf(bp, ")"); 1435 } 1436 1437 static void 1438 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1439 { 1440 uint8_t type; 1441 1442 cmd->d[0] = 0; 1443 while (*av) { 1444 if (*av == ',') 1445 av++; 1446 1447 type = strtoul(av, &av, 0); 1448 1449 if (*av != ',' && *av != '\0') 1450 errx(EX_DATAERR, "invalid ICMP type"); 1451 1452 if (type > 31) 1453 errx(EX_DATAERR, "ICMP type out of range"); 1454 1455 cmd->d[0] |= 1 << type; 1456 } 1457 cmd->o.opcode = O_ICMPTYPE; 1458 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1459 } 1460 1461 static void 1462 print_icmptypes(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1463 { 1464 int i; 1465 char sep= ' '; 1466 1467 bprintf(bp, " icmptypes"); 1468 for (i = 0; i < 32; i++) { 1469 if ( (cmd->d[0] & (1 << (i))) == 0) 1470 continue; 1471 bprintf(bp, "%c%d", sep, i); 1472 sep = ','; 1473 } 1474 } 1475 1476 static void 1477 print_dscp(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1478 { 1479 const uint32_t *v; 1480 const char *code; 1481 int i = 0; 1482 char sep= ' '; 1483 1484 bprintf(bp, " dscp"); 1485 v = cmd->d; 1486 while (i < 64) { 1487 if (*v & (1 << i)) { 1488 if ((code = match_value(f_ipdscp, i)) != NULL) 1489 bprintf(bp, "%c%s", sep, code); 1490 else 1491 bprintf(bp, "%c%d", sep, i); 1492 sep = ','; 1493 } 1494 1495 if ((++i % 32) == 0) 1496 v++; 1497 } 1498 } 1499 1500 #define insntod(cmd, type) ((const ipfw_insn_ ## type *)(cmd)) 1501 struct show_state { 1502 struct ip_fw_rule *rule; 1503 const ipfw_insn *eaction; 1504 uint8_t *printed; 1505 int flags; 1506 #define HAVE_PROTO 0x0001 1507 #define HAVE_SRCIP 0x0002 1508 #define HAVE_DSTIP 0x0004 1509 #define HAVE_PROBE_STATE 0x0008 1510 int proto; 1511 int or_block; 1512 }; 1513 1514 static int 1515 init_show_state(struct show_state *state, struct ip_fw_rule *rule) 1516 { 1517 1518 state->printed = calloc(rule->cmd_len, sizeof(uint8_t)); 1519 if (state->printed == NULL) 1520 return (ENOMEM); 1521 state->rule = rule; 1522 state->eaction = NULL; 1523 state->flags = 0; 1524 state->proto = 0; 1525 state->or_block = 0; 1526 return (0); 1527 } 1528 1529 static void 1530 free_show_state(struct show_state *state) 1531 { 1532 1533 free(state->printed); 1534 } 1535 1536 static uint8_t 1537 is_printed_opcode(struct show_state *state, const ipfw_insn *cmd) 1538 { 1539 1540 return (state->printed[cmd - state->rule->cmd]); 1541 } 1542 1543 static void 1544 mark_printed(struct show_state *state, const ipfw_insn *cmd) 1545 { 1546 1547 state->printed[cmd - state->rule->cmd] = 1; 1548 } 1549 1550 static void 1551 print_limit_mask(struct buf_pr *bp, const ipfw_insn_limit *limit) 1552 { 1553 struct _s_x *p = limit_masks; 1554 char const *comma = " "; 1555 uint8_t x; 1556 1557 for (x = limit->limit_mask; p->x != 0; p++) { 1558 if ((x & p->x) == p->x) { 1559 x &= ~p->x; 1560 bprintf(bp, "%s%s", comma, p->s); 1561 comma = ","; 1562 } 1563 } 1564 bprint_uint_arg(bp, " ", limit->conn_limit); 1565 } 1566 1567 static int 1568 print_instruction(struct buf_pr *bp, const struct format_opts *fo, 1569 struct show_state *state, const ipfw_insn *cmd) 1570 { 1571 struct protoent *pe; 1572 struct passwd *pwd; 1573 struct group *grp; 1574 const char *s; 1575 double d; 1576 1577 if (is_printed_opcode(state, cmd)) 1578 return (0); 1579 if ((cmd->len & F_OR) != 0 && state->or_block == 0) 1580 bprintf(bp, " {"); 1581 if (cmd->opcode != O_IN && (cmd->len & F_NOT) != 0) 1582 bprintf(bp, " not"); 1583 1584 switch (cmd->opcode) { 1585 case O_PROB: 1586 d = 1.0 * insntod(cmd, u32)->d[0] / 0x7fffffff; 1587 bprintf(bp, "prob %f ", d); 1588 break; 1589 case O_PROBE_STATE: /* no need to print anything here */ 1590 state->flags |= HAVE_PROBE_STATE; 1591 break; 1592 case O_IP_SRC: 1593 case O_IP_SRC_LOOKUP: 1594 case O_IP_SRC_MASK: 1595 case O_IP_SRC_ME: 1596 case O_IP_SRC_SET: 1597 if (state->flags & HAVE_SRCIP) 1598 bprintf(bp, " src-ip"); 1599 print_ip(bp, fo, insntod(cmd, ip)); 1600 break; 1601 case O_IP_DST: 1602 case O_IP_DST_LOOKUP: 1603 case O_IP_DST_MASK: 1604 case O_IP_DST_ME: 1605 case O_IP_DST_SET: 1606 if (state->flags & HAVE_DSTIP) 1607 bprintf(bp, " dst-ip"); 1608 print_ip(bp, fo, insntod(cmd, ip)); 1609 break; 1610 case O_IP6_SRC: 1611 case O_IP6_SRC_MASK: 1612 case O_IP6_SRC_ME: 1613 if (state->flags & HAVE_SRCIP) 1614 bprintf(bp, " src-ip6"); 1615 print_ip6(bp, insntod(cmd, ip6)); 1616 break; 1617 case O_IP6_DST: 1618 case O_IP6_DST_MASK: 1619 case O_IP6_DST_ME: 1620 if (state->flags & HAVE_DSTIP) 1621 bprintf(bp, " dst-ip6"); 1622 print_ip6(bp, insntod(cmd, ip6)); 1623 break; 1624 case O_MAC_SRC_LOOKUP: 1625 bprintf(bp, " src-mac"); 1626 print_mac_lookup(bp, fo, cmd); 1627 break; 1628 case O_MAC_DST_LOOKUP: 1629 bprintf(bp, " dst-mac"); 1630 print_mac_lookup(bp, fo, cmd); 1631 break; 1632 case O_FLOW6ID: 1633 print_flow6id(bp, insntod(cmd, u32)); 1634 break; 1635 case O_IP_DSTPORT: 1636 case O_IP_SRCPORT: 1637 print_newports(bp, insntod(cmd, u16), state->proto, 1638 (state->flags & (HAVE_SRCIP | HAVE_DSTIP)) == 1639 (HAVE_SRCIP | HAVE_DSTIP) ? cmd->opcode: 0); 1640 break; 1641 case O_PROTO: 1642 pe = getprotobynumber(cmd->arg1); 1643 if (state->flags & HAVE_PROTO) 1644 bprintf(bp, " proto"); 1645 if (pe != NULL) 1646 bprintf(bp, " %s", pe->p_name); 1647 else 1648 bprintf(bp, " %u", cmd->arg1); 1649 state->proto = cmd->arg1; 1650 break; 1651 case O_MACADDR2: 1652 print_mac(bp, insntod(cmd, mac)); 1653 break; 1654 case O_MAC_TYPE: 1655 print_newports(bp, insntod(cmd, u16), 1656 IPPROTO_ETHERTYPE, cmd->opcode); 1657 break; 1658 case O_FRAG: 1659 print_flags(bp, "frag", cmd, f_ipoff); 1660 break; 1661 case O_FIB: 1662 bprintf(bp, " fib %u", cmd->arg1); 1663 break; 1664 case O_SOCKARG: 1665 bprintf(bp, " sockarg"); 1666 break; 1667 case O_IN: 1668 bprintf(bp, cmd->len & F_NOT ? " out" : " in"); 1669 break; 1670 case O_DIVERTED: 1671 switch (cmd->arg1) { 1672 case 3: 1673 bprintf(bp, " diverted"); 1674 break; 1675 case 2: 1676 bprintf(bp, " diverted-output"); 1677 break; 1678 case 1: 1679 bprintf(bp, " diverted-loopback"); 1680 break; 1681 default: 1682 bprintf(bp, " diverted-?<%u>", cmd->arg1); 1683 break; 1684 } 1685 break; 1686 case O_LAYER2: 1687 bprintf(bp, " layer2"); 1688 break; 1689 case O_XMIT: 1690 case O_RECV: 1691 case O_VIA: 1692 if (cmd->opcode == O_XMIT) 1693 s = "xmit"; 1694 else if (cmd->opcode == O_RECV) 1695 s = "recv"; 1696 else /* if (cmd->opcode == O_VIA) */ 1697 s = "via"; 1698 switch (insntod(cmd, if)->name[0]) { 1699 case '\0': 1700 bprintf(bp, " %s %s", s, 1701 inet_ntoa(insntod(cmd, if)->p.ip)); 1702 break; 1703 case '\1': 1704 bprintf(bp, " %s table(%s)", s, 1705 table_search_ctlv(fo->tstate, 1706 insntod(cmd, if)->p.kidx)); 1707 break; 1708 default: 1709 bprintf(bp, " %s %s", s, 1710 insntod(cmd, if)->name); 1711 } 1712 break; 1713 case O_IP_FLOW_LOOKUP: 1714 s = table_search_ctlv(fo->tstate, cmd->arg1); 1715 bprintf(bp, " flow table(%s", s); 1716 if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) 1717 bprintf(bp, ",%u", insntod(cmd, u32)->d[0]); 1718 bprintf(bp, ")"); 1719 break; 1720 case O_IPID: 1721 case O_IPTTL: 1722 case O_IPLEN: 1723 case O_TCPDATALEN: 1724 case O_TCPMSS: 1725 case O_TCPWIN: 1726 if (F_LEN(cmd) == 1) { 1727 switch (cmd->opcode) { 1728 case O_IPID: 1729 s = "ipid"; 1730 break; 1731 case O_IPTTL: 1732 s = "ipttl"; 1733 break; 1734 case O_IPLEN: 1735 s = "iplen"; 1736 break; 1737 case O_TCPDATALEN: 1738 s = "tcpdatalen"; 1739 break; 1740 case O_TCPMSS: 1741 s = "tcpmss"; 1742 break; 1743 case O_TCPWIN: 1744 s = "tcpwin"; 1745 break; 1746 default: 1747 s = "<unknown>"; 1748 break; 1749 } 1750 bprintf(bp, " %s %u", s, cmd->arg1); 1751 } else 1752 print_newports(bp, insntod(cmd, u16), 0, 1753 cmd->opcode); 1754 break; 1755 case O_IPVER: 1756 bprintf(bp, " ipver %u", cmd->arg1); 1757 break; 1758 case O_IPPRECEDENCE: 1759 bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); 1760 break; 1761 case O_DSCP: 1762 print_dscp(bp, insntod(cmd, u32)); 1763 break; 1764 case O_IPOPT: 1765 print_flags(bp, "ipoptions", cmd, f_ipopts); 1766 break; 1767 case O_IPTOS: 1768 print_flags(bp, "iptos", cmd, f_iptos); 1769 break; 1770 case O_ICMPTYPE: 1771 print_icmptypes(bp, insntod(cmd, u32)); 1772 break; 1773 case O_ESTAB: 1774 bprintf(bp, " established"); 1775 break; 1776 case O_TCPFLAGS: 1777 print_flags(bp, "tcpflags", cmd, f_tcpflags); 1778 break; 1779 case O_TCPOPTS: 1780 print_flags(bp, "tcpoptions", cmd, f_tcpopts); 1781 break; 1782 case O_TCPACK: 1783 bprintf(bp, " tcpack %d", 1784 ntohl(insntod(cmd, u32)->d[0])); 1785 break; 1786 case O_TCPSEQ: 1787 bprintf(bp, " tcpseq %d", 1788 ntohl(insntod(cmd, u32)->d[0])); 1789 break; 1790 case O_UID: 1791 pwd = getpwuid(insntod(cmd, u32)->d[0]); 1792 if (pwd != NULL) 1793 bprintf(bp, " uid %s", pwd->pw_name); 1794 else 1795 bprintf(bp, " uid %u", 1796 insntod(cmd, u32)->d[0]); 1797 break; 1798 case O_GID: 1799 grp = getgrgid(insntod(cmd, u32)->d[0]); 1800 if (grp != NULL) 1801 bprintf(bp, " gid %s", grp->gr_name); 1802 else 1803 bprintf(bp, " gid %u", 1804 insntod(cmd, u32)->d[0]); 1805 break; 1806 case O_JAIL: 1807 bprintf(bp, " jail %d", insntod(cmd, u32)->d[0]); 1808 break; 1809 case O_VERREVPATH: 1810 bprintf(bp, " verrevpath"); 1811 break; 1812 case O_VERSRCREACH: 1813 bprintf(bp, " versrcreach"); 1814 break; 1815 case O_ANTISPOOF: 1816 bprintf(bp, " antispoof"); 1817 break; 1818 case O_IPSEC: 1819 bprintf(bp, " ipsec"); 1820 break; 1821 case O_NOP: 1822 bprintf(bp, " // %s", (const char *)(cmd + 1)); 1823 break; 1824 case O_KEEP_STATE: 1825 if (state->flags & HAVE_PROBE_STATE) 1826 bprintf(bp, " keep-state"); 1827 else 1828 bprintf(bp, " record-state"); 1829 bprintf(bp, " :%s", 1830 object_search_ctlv(fo->tstate, cmd->arg1, 1831 IPFW_TLV_STATE_NAME)); 1832 break; 1833 case O_LIMIT: 1834 if (state->flags & HAVE_PROBE_STATE) 1835 bprintf(bp, " limit"); 1836 else 1837 bprintf(bp, " set-limit"); 1838 print_limit_mask(bp, insntod(cmd, limit)); 1839 bprintf(bp, " :%s", 1840 object_search_ctlv(fo->tstate, cmd->arg1, 1841 IPFW_TLV_STATE_NAME)); 1842 break; 1843 case O_IP6: 1844 if (state->flags & HAVE_PROTO) 1845 bprintf(bp, " proto"); 1846 bprintf(bp, " ip6"); 1847 break; 1848 case O_IP4: 1849 if (state->flags & HAVE_PROTO) 1850 bprintf(bp, " proto"); 1851 bprintf(bp, " ip4"); 1852 break; 1853 case O_ICMP6TYPE: 1854 print_icmp6types(bp, insntod(cmd, u32)); 1855 break; 1856 case O_EXT_HDR: 1857 print_ext6hdr(bp, cmd); 1858 break; 1859 case O_TAGGED: 1860 if (F_LEN(cmd) == 1) 1861 bprint_uint_arg(bp, " tagged ", cmd->arg1); 1862 else 1863 print_newports(bp, insntod(cmd, u16), 1864 0, O_TAGGED); 1865 break; 1866 case O_SKIP_ACTION: 1867 bprintf(bp, " defer-immediate-action"); 1868 break; 1869 case O_MARK: 1870 bprintf(bp, " mark"); 1871 if (cmd->arg1 == IP_FW_TARG) 1872 bprintf(bp, " tablearg"); 1873 else 1874 bprintf(bp, " %#x", 1875 ((const ipfw_insn_u32 *)cmd)->d[0]); 1876 1877 if (((const ipfw_insn_u32 *)cmd)->d[1] != 0xFFFFFFFF) 1878 bprintf(bp, ":%#x", 1879 ((const ipfw_insn_u32 *)cmd)->d[1]); 1880 break; 1881 1882 default: 1883 bprintf(bp, " [opcode %d len %d]", cmd->opcode, 1884 cmd->len); 1885 } 1886 if (cmd->len & F_OR) { 1887 bprintf(bp, " or"); 1888 state->or_block = 1; 1889 } else if (state->or_block != 0) { 1890 bprintf(bp, " }"); 1891 state->or_block = 0; 1892 } 1893 mark_printed(state, cmd); 1894 1895 return (1); 1896 } 1897 1898 static ipfw_insn * 1899 print_opcode(struct buf_pr *bp, struct format_opts *fo, 1900 struct show_state *state, int opcode) 1901 { 1902 ipfw_insn *cmd; 1903 int l; 1904 1905 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 1906 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1907 /* We use zero opcode to print the rest of options */ 1908 if (opcode >= 0 && cmd->opcode != opcode) 1909 continue; 1910 /* 1911 * Skip O_NOP, when we printing the rest 1912 * of options, it will be handled separately. 1913 */ 1914 if (cmd->opcode == O_NOP && opcode != O_NOP) 1915 continue; 1916 if (!print_instruction(bp, fo, state, cmd)) 1917 continue; 1918 return (cmd); 1919 } 1920 return (NULL); 1921 } 1922 1923 static void 1924 print_fwd(struct buf_pr *bp, const ipfw_insn *cmd) 1925 { 1926 char buf[INET6_ADDRSTRLEN + IF_NAMESIZE + 2]; 1927 const ipfw_insn_sa6 *sa6; 1928 const ipfw_insn_sa *sa; 1929 uint16_t port; 1930 1931 if (cmd->opcode == O_FORWARD_IP) { 1932 sa = insntod(cmd, sa); 1933 port = sa->sa.sin_port; 1934 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 1935 bprintf(bp, "fwd tablearg"); 1936 else 1937 bprintf(bp, "fwd %s", inet_ntoa(sa->sa.sin_addr)); 1938 } else { 1939 sa6 = insntod(cmd, sa6); 1940 port = sa6->sa.sin6_port; 1941 bprintf(bp, "fwd "); 1942 if (getnameinfo((const struct sockaddr *)&sa6->sa, 1943 sizeof(struct sockaddr_in6), buf, sizeof(buf), NULL, 0, 1944 NI_NUMERICHOST) == 0) 1945 bprintf(bp, "%s", buf); 1946 } 1947 if (port != 0) 1948 bprintf(bp, ",%u", port); 1949 } 1950 1951 static int 1952 print_action_instruction(struct buf_pr *bp, const struct format_opts *fo, 1953 struct show_state *state, const ipfw_insn *cmd) 1954 { 1955 const char *s; 1956 1957 if (is_printed_opcode(state, cmd)) 1958 return (0); 1959 switch (cmd->opcode) { 1960 case O_CHECK_STATE: 1961 bprintf(bp, "check-state"); 1962 if (cmd->arg1 != 0) 1963 s = object_search_ctlv(fo->tstate, cmd->arg1, 1964 IPFW_TLV_STATE_NAME); 1965 else 1966 s = NULL; 1967 bprintf(bp, " :%s", s ? s: "any"); 1968 break; 1969 case O_ACCEPT: 1970 bprintf(bp, "allow"); 1971 break; 1972 case O_COUNT: 1973 bprintf(bp, "count"); 1974 break; 1975 case O_DENY: 1976 bprintf(bp, "deny"); 1977 break; 1978 case O_REJECT: 1979 if (cmd->arg1 == ICMP_REJECT_RST) 1980 bprintf(bp, "reset"); 1981 else if (cmd->arg1 == ICMP_REJECT_ABORT) 1982 bprintf(bp, "abort"); 1983 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1984 bprintf(bp, "reject"); 1985 else if (cmd->arg1 == ICMP_UNREACH_NEEDFRAG && 1986 cmd->len == F_INSN_SIZE(ipfw_insn_u16)) 1987 bprintf(bp, "needfrag %u", 1988 ((const ipfw_insn_u16 *)cmd)->ports[0]); 1989 else 1990 print_reject_code(bp, cmd->arg1); 1991 break; 1992 case O_UNREACH6: 1993 if (cmd->arg1 == ICMP6_UNREACH_RST) 1994 bprintf(bp, "reset6"); 1995 else if (cmd->arg1 == ICMP6_UNREACH_ABORT) 1996 bprintf(bp, "abort6"); 1997 else 1998 print_unreach6_code(bp, cmd->arg1); 1999 break; 2000 case O_SKIPTO: 2001 bprint_uint_arg(bp, "skipto ", cmd->arg1); 2002 break; 2003 case O_PIPE: 2004 bprint_uint_arg(bp, "pipe ", cmd->arg1); 2005 break; 2006 case O_QUEUE: 2007 bprint_uint_arg(bp, "queue ", cmd->arg1); 2008 break; 2009 case O_DIVERT: 2010 bprint_uint_arg(bp, "divert ", cmd->arg1); 2011 break; 2012 case O_TEE: 2013 bprint_uint_arg(bp, "tee ", cmd->arg1); 2014 break; 2015 case O_NETGRAPH: 2016 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 2017 break; 2018 case O_NGTEE: 2019 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 2020 break; 2021 case O_FORWARD_IP: 2022 case O_FORWARD_IP6: 2023 print_fwd(bp, cmd); 2024 break; 2025 case O_LOG: 2026 if (insntod(cmd, log)->max_log > 0) 2027 bprintf(bp, " log logamount %d", 2028 insntod(cmd, log)->max_log); 2029 else 2030 bprintf(bp, " log"); 2031 break; 2032 case O_ALTQ: 2033 #ifndef NO_ALTQ 2034 print_altq_cmd(bp, insntod(cmd, altq)); 2035 #endif 2036 break; 2037 case O_TAG: 2038 bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ": 2039 " tag ", cmd->arg1); 2040 break; 2041 case O_NAT: 2042 if (cmd->arg1 != IP_FW_NAT44_GLOBAL) 2043 bprint_uint_arg(bp, "nat ", cmd->arg1); 2044 else 2045 bprintf(bp, "nat global"); 2046 break; 2047 case O_SETFIB: 2048 if (cmd->arg1 == IP_FW_TARG) 2049 bprint_uint_arg(bp, "setfib ", cmd->arg1); 2050 else 2051 bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF); 2052 break; 2053 case O_EXTERNAL_ACTION: 2054 /* 2055 * The external action can consists of two following 2056 * each other opcodes - O_EXTERNAL_ACTION and 2057 * O_EXTERNAL_INSTANCE. The first contains the ID of 2058 * name of external action. The second contains the ID 2059 * of name of external action instance. 2060 * NOTE: in case when external action has no named 2061 * instances support, the second opcode isn't needed. 2062 */ 2063 state->eaction = cmd; 2064 s = object_search_ctlv(fo->tstate, cmd->arg1, 2065 IPFW_TLV_EACTION); 2066 if (match_token(rule_eactions, s) != -1) 2067 bprintf(bp, "%s", s); 2068 else 2069 bprintf(bp, "eaction %s", s); 2070 break; 2071 case O_EXTERNAL_INSTANCE: 2072 if (state->eaction == NULL) 2073 break; 2074 /* 2075 * XXX: we need to teach ipfw(9) to rewrite opcodes 2076 * in the user buffer on rule addition. When we add 2077 * the rule, we specify zero TLV type for 2078 * O_EXTERNAL_INSTANCE object. To show correct 2079 * rule after `ipfw add` we need to search instance 2080 * name with zero type. But when we do `ipfw show` 2081 * we calculate TLV type using IPFW_TLV_EACTION_NAME() 2082 * macro. 2083 */ 2084 s = object_search_ctlv(fo->tstate, cmd->arg1, 0); 2085 if (s == NULL) 2086 s = object_search_ctlv(fo->tstate, 2087 cmd->arg1, IPFW_TLV_EACTION_NAME( 2088 state->eaction->arg1)); 2089 bprintf(bp, " %s", s); 2090 break; 2091 case O_EXTERNAL_DATA: 2092 if (state->eaction == NULL) 2093 break; 2094 /* 2095 * Currently we support data formatting only for 2096 * external data with datalen u16. For unknown data 2097 * print its size in bytes. 2098 */ 2099 if (cmd->len == F_INSN_SIZE(ipfw_insn)) 2100 bprintf(bp, " %u", cmd->arg1); 2101 else 2102 bprintf(bp, " %ubytes", 2103 cmd->len * sizeof(uint32_t)); 2104 break; 2105 case O_SETDSCP: 2106 if (cmd->arg1 == IP_FW_TARG) { 2107 bprintf(bp, "setdscp tablearg"); 2108 break; 2109 } 2110 s = match_value(f_ipdscp, cmd->arg1 & 0x3F); 2111 if (s != NULL) 2112 bprintf(bp, "setdscp %s", s); 2113 else 2114 bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F); 2115 break; 2116 case O_REASS: 2117 bprintf(bp, "reass"); 2118 break; 2119 case O_CALLRETURN: 2120 if (cmd->len & F_NOT) 2121 bprintf(bp, "return"); 2122 else 2123 bprint_uint_arg(bp, "call ", cmd->arg1); 2124 break; 2125 case O_SETMARK: 2126 if (cmd->arg1 == IP_FW_TARG) { 2127 bprintf(bp, "setmark tablearg"); 2128 break; 2129 } 2130 bprintf(bp, "setmark %#x", ((const ipfw_insn_u32 *)cmd)->d[0]); 2131 break; 2132 default: 2133 bprintf(bp, "** unrecognized action %d len %d ", 2134 cmd->opcode, cmd->len); 2135 } 2136 mark_printed(state, cmd); 2137 2138 return (1); 2139 } 2140 2141 2142 static ipfw_insn * 2143 print_action(struct buf_pr *bp, struct format_opts *fo, 2144 struct show_state *state, uint8_t opcode) 2145 { 2146 ipfw_insn *cmd; 2147 int l; 2148 2149 for (l = state->rule->cmd_len - state->rule->act_ofs, 2150 cmd = ACTION_PTR(state->rule); l > 0; 2151 l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2152 if (cmd->opcode != opcode) 2153 continue; 2154 if (!print_action_instruction(bp, fo, state, cmd)) 2155 continue; 2156 return (cmd); 2157 } 2158 return (NULL); 2159 } 2160 2161 static void 2162 print_proto(struct buf_pr *bp, struct format_opts *fo, 2163 struct show_state *state) 2164 { 2165 ipfw_insn *cmd; 2166 int l, proto, ip4, ip6; 2167 2168 /* Count all O_PROTO, O_IP4, O_IP6 instructions. */ 2169 proto = ip4 = ip6 = 0; 2170 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2171 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2172 switch (cmd->opcode) { 2173 case O_PROTO: 2174 proto++; 2175 break; 2176 case O_IP4: 2177 ip4 = 1; 2178 if (cmd->len & F_OR) 2179 ip4++; 2180 break; 2181 case O_IP6: 2182 ip6 = 1; 2183 if (cmd->len & F_OR) 2184 ip6++; 2185 break; 2186 default: 2187 continue; 2188 } 2189 } 2190 if (proto == 0 && ip4 == 0 && ip6 == 0) { 2191 state->proto = IPPROTO_IP; 2192 state->flags |= HAVE_PROTO; 2193 bprintf(bp, " ip"); 2194 return; 2195 } 2196 /* To handle the case { ip4 or ip6 }, print opcode with F_OR first */ 2197 cmd = NULL; 2198 if (ip4 || ip6) 2199 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6); 2200 if (cmd != NULL && (cmd->len & F_OR)) 2201 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4); 2202 if (cmd == NULL || (cmd->len & F_OR)) 2203 for (l = proto; l > 0; l--) { 2204 cmd = print_opcode(bp, fo, state, O_PROTO); 2205 if (cmd == NULL || (cmd->len & F_OR) == 0) 2206 break; 2207 } 2208 /* Initialize proto, it is used by print_newports() */ 2209 state->flags |= HAVE_PROTO; 2210 if (state->proto == 0 && ip6 != 0) 2211 state->proto = IPPROTO_IPV6; 2212 } 2213 2214 static int 2215 match_opcode(int opcode, const int opcodes[], size_t nops) 2216 { 2217 size_t i; 2218 2219 for (i = 0; i < nops; i++) 2220 if (opcode == opcodes[i]) 2221 return (1); 2222 return (0); 2223 } 2224 2225 static void 2226 print_address(struct buf_pr *bp, struct format_opts *fo, 2227 struct show_state *state, const int opcodes[], size_t nops, int portop, 2228 int flag) 2229 { 2230 ipfw_insn *cmd; 2231 int count, l, portcnt, pf; 2232 2233 count = portcnt = 0; 2234 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2235 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2236 if (match_opcode(cmd->opcode, opcodes, nops)) 2237 count++; 2238 else if (cmd->opcode == portop) 2239 portcnt++; 2240 } 2241 if (count == 0) 2242 bprintf(bp, " any"); 2243 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2244 l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2245 if (!match_opcode(cmd->opcode, opcodes, nops)) 2246 continue; 2247 print_instruction(bp, fo, state, cmd); 2248 if ((cmd->len & F_OR) == 0) 2249 break; 2250 count--; 2251 } 2252 /* 2253 * If several O_IP_?PORT opcodes specified, leave them to the 2254 * options section. 2255 */ 2256 if (portcnt == 1) { 2257 for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0; 2258 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2259 if (cmd->opcode != portop) { 2260 pf = (cmd->len & F_OR); 2261 continue; 2262 } 2263 /* Print opcode iff it is not in OR block. */ 2264 if (pf == 0 && (cmd->len & F_OR) == 0) 2265 print_instruction(bp, fo, state, cmd); 2266 break; 2267 } 2268 } 2269 state->flags |= flag; 2270 } 2271 2272 static const int action_opcodes[] = { 2273 O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT, 2274 O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE, 2275 O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT, 2276 O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN, O_SETMARK, 2277 /* keep the following opcodes at the end of the list */ 2278 O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA 2279 }; 2280 2281 static const int modifier_opcodes[] = { 2282 O_LOG, O_ALTQ, O_TAG 2283 }; 2284 2285 static const int src_opcodes[] = { 2286 O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME, 2287 O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME 2288 }; 2289 2290 static const int dst_opcodes[] = { 2291 O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME, 2292 O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME 2293 }; 2294 2295 static void 2296 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 2297 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 2298 { 2299 static int twidth = 0; 2300 struct show_state state; 2301 ipfw_insn *cmd; 2302 size_t i; 2303 2304 /* Print # DISABLED or skip the rule */ 2305 if ((fo->set_mask & (1 << rule->set)) == 0) { 2306 /* disabled mask */ 2307 if (!co->show_sets) 2308 return; 2309 else 2310 bprintf(bp, "# DISABLED "); 2311 } 2312 if (init_show_state(&state, rule) != 0) { 2313 warn("init_show_state() failed"); 2314 return; 2315 } 2316 bprintf(bp, "%05u ", rule->rulenum); 2317 2318 /* only if counters are available */ 2319 if (cntr != NULL) { 2320 /* Print counters if enabled */ 2321 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2322 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 2323 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 2324 } 2325 2326 /* Print timestamp */ 2327 if (co->do_time == TIMESTAMP_NUMERIC) 2328 bprintf(bp, "%10u ", cntr->timestamp); 2329 else if (co->do_time == TIMESTAMP_STRING) { 2330 char timestr[30]; 2331 time_t t = (time_t)0; 2332 2333 if (twidth == 0) { 2334 strcpy(timestr, ctime(&t)); 2335 *strchr(timestr, '\n') = '\0'; 2336 twidth = strlen(timestr); 2337 } 2338 if (cntr->timestamp > 0) { 2339 t = _long_to_time(cntr->timestamp); 2340 2341 strcpy(timestr, ctime(&t)); 2342 *strchr(timestr, '\n') = '\0'; 2343 bprintf(bp, "%s ", timestr); 2344 } else { 2345 bprintf(bp, "%*s ", twidth, ""); 2346 } 2347 } 2348 } 2349 2350 /* Print set number */ 2351 if (co->show_sets) 2352 bprintf(bp, "set %d ", rule->set); 2353 2354 /* Print the optional "match probability" */ 2355 cmd = print_opcode(bp, fo, &state, O_PROB); 2356 /* Print rule action */ 2357 for (i = 0; i < nitems(action_opcodes); i++) { 2358 cmd = print_action(bp, fo, &state, action_opcodes[i]); 2359 if (cmd == NULL) 2360 continue; 2361 /* Handle special cases */ 2362 switch (cmd->opcode) { 2363 case O_CHECK_STATE: 2364 goto end; 2365 case O_EXTERNAL_ACTION: 2366 case O_EXTERNAL_INSTANCE: 2367 /* External action can have several instructions */ 2368 continue; 2369 } 2370 break; 2371 } 2372 /* Print rule modifiers */ 2373 for (i = 0; i < nitems(modifier_opcodes); i++) 2374 print_action(bp, fo, &state, modifier_opcodes[i]); 2375 /* 2376 * Print rule body 2377 */ 2378 if (co->comment_only != 0) 2379 goto end; 2380 2381 if (rule->flags & IPFW_RULE_JUSTOPTS) { 2382 state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; 2383 goto justopts; 2384 } 2385 2386 print_proto(bp, fo, &state); 2387 if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT)) 2388 goto justopts; 2389 2390 /* Print source */ 2391 bprintf(bp, " from"); 2392 print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes), 2393 O_IP_SRCPORT, HAVE_SRCIP); 2394 2395 /* Print destination */ 2396 bprintf(bp, " to"); 2397 print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes), 2398 O_IP_DSTPORT, HAVE_DSTIP); 2399 2400 justopts: 2401 /* Print the rest of options */ 2402 while (print_opcode(bp, fo, &state, -1)) 2403 ; 2404 end: 2405 /* Print comment at the end */ 2406 cmd = print_opcode(bp, fo, &state, O_NOP); 2407 if (co->comment_only != 0 && cmd == NULL) 2408 bprintf(bp, " // ..."); 2409 bprintf(bp, "\n"); 2410 free_show_state(&state); 2411 } 2412 2413 static void 2414 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2415 struct buf_pr *bp, ipfw_dyn_rule *d) 2416 { 2417 struct protoent *pe; 2418 struct in_addr a; 2419 uint16_t rulenum; 2420 char buf[INET6_ADDRSTRLEN]; 2421 2422 if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT) 2423 return; 2424 2425 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2426 bprintf(bp, "%05d", rulenum); 2427 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2428 bprintf(bp, " "); 2429 pr_u64(bp, &d->pcnt, fo->pcwidth); 2430 pr_u64(bp, &d->bcnt, fo->bcwidth); 2431 bprintf(bp, "(%ds)", d->expire); 2432 } 2433 switch (d->dyn_type) { 2434 case O_LIMIT_PARENT: 2435 bprintf(bp, " PARENT %d", d->count); 2436 break; 2437 case O_LIMIT: 2438 bprintf(bp, " LIMIT"); 2439 break; 2440 case O_KEEP_STATE: /* bidir, no mask */ 2441 bprintf(bp, " STATE"); 2442 break; 2443 } 2444 2445 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2446 bprintf(bp, " %s", pe->p_name); 2447 else 2448 bprintf(bp, " proto %u", d->id.proto); 2449 2450 if (d->id.addr_type == 4) { 2451 a.s_addr = htonl(d->id.src_ip); 2452 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2453 2454 a.s_addr = htonl(d->id.dst_ip); 2455 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2456 } else if (d->id.addr_type == 6) { 2457 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2458 sizeof(buf)), d->id.src_port); 2459 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2460 buf, sizeof(buf)), d->id.dst_port); 2461 } else 2462 bprintf(bp, " UNKNOWN <-> UNKNOWN"); 2463 if (d->kidx != 0) 2464 bprintf(bp, " :%s", object_search_ctlv(fo->tstate, 2465 d->kidx, IPFW_TLV_STATE_NAME)); 2466 2467 #define BOTH_SYN (TH_SYN | (TH_SYN << 8)) 2468 #define BOTH_FIN (TH_FIN | (TH_FIN << 8)) 2469 if (co->verbose) { 2470 bprintf(bp, " state 0x%08x%s", d->state, 2471 d->state ? " ": ","); 2472 if (d->state & IPFW_DYN_ORPHANED) 2473 bprintf(bp, "ORPHANED,"); 2474 if ((d->state & BOTH_SYN) == BOTH_SYN) 2475 bprintf(bp, "BOTH_SYN,"); 2476 else { 2477 if (d->state & TH_SYN) 2478 bprintf(bp, "F_SYN,"); 2479 if (d->state & (TH_SYN << 8)) 2480 bprintf(bp, "R_SYN,"); 2481 } 2482 if ((d->state & BOTH_FIN) == BOTH_FIN) 2483 bprintf(bp, "BOTH_FIN,"); 2484 else { 2485 if (d->state & TH_FIN) 2486 bprintf(bp, "F_FIN,"); 2487 if (d->state & (TH_FIN << 8)) 2488 bprintf(bp, "R_FIN,"); 2489 } 2490 bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd, 2491 d->ack_rev); 2492 } 2493 } 2494 2495 static int 2496 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2497 { 2498 ipfw_range_header rh; 2499 size_t sz; 2500 2501 memset(&rh, 0, sizeof(rh)); 2502 memcpy(&rh.range, rt, sizeof(*rt)); 2503 rh.range.head.length = sizeof(*rt); 2504 rh.range.head.type = IPFW_TLV_RANGE; 2505 sz = sizeof(rh); 2506 2507 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2508 return (-1); 2509 /* Save number of matched objects */ 2510 rt->new_set = rh.range.new_set; 2511 return (0); 2512 } 2513 2514 /* 2515 * This one handles all set-related commands 2516 * ipfw set { show | enable | disable } 2517 * ipfw set swap X Y 2518 * ipfw set move X to Y 2519 * ipfw set move rule X to Y 2520 */ 2521 void 2522 ipfw_sets_handler(char *av[]) 2523 { 2524 ipfw_range_tlv rt; 2525 const char *msg; 2526 size_t size; 2527 uint32_t masks[2]; 2528 int i; 2529 uint16_t rulenum; 2530 uint8_t cmd; 2531 2532 av++; 2533 memset(&rt, 0, sizeof(rt)); 2534 2535 if (av[0] == NULL) 2536 errx(EX_USAGE, "set needs command"); 2537 if (_substrcmp(*av, "show") == 0) { 2538 struct format_opts fo; 2539 ipfw_cfg_lheader *cfg; 2540 2541 memset(&fo, 0, sizeof(fo)); 2542 if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0) 2543 err(EX_OSERR, "requesting config failed"); 2544 2545 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2546 if ((cfg->set_mask & (1<<i)) == 0) { 2547 printf("%s %d", msg, i); 2548 msg = ""; 2549 } 2550 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2551 for (i = 0; i < RESVD_SET; i++) 2552 if ((cfg->set_mask & (1<<i)) != 0) { 2553 printf("%s %d", msg, i); 2554 msg = ""; 2555 } 2556 printf("\n"); 2557 free(cfg); 2558 } else if (_substrcmp(*av, "swap") == 0) { 2559 av++; 2560 if ( av[0] == NULL || av[1] == NULL ) 2561 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2562 rt.set = atoi(av[0]); 2563 rt.new_set = atoi(av[1]); 2564 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2565 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2566 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2567 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2568 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2569 } else if (_substrcmp(*av, "move") == 0) { 2570 av++; 2571 if (av[0] && _substrcmp(*av, "rule") == 0) { 2572 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2573 cmd = IP_FW_XMOVE; 2574 av++; 2575 } else 2576 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2577 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2578 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2579 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2580 rulenum = atoi(av[0]); 2581 rt.new_set = atoi(av[2]); 2582 if (cmd == IP_FW_XMOVE) { 2583 rt.start_rule = rulenum; 2584 rt.end_rule = rulenum; 2585 } else 2586 rt.set = rulenum; 2587 rt.new_set = atoi(av[2]); 2588 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2589 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2590 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2591 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2592 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2593 i = do_range_cmd(cmd, &rt); 2594 if (i < 0) 2595 err(EX_OSERR, "failed to move %s", 2596 cmd == IP_FW_SET_MOVE ? "set": "rule"); 2597 } else if (_substrcmp(*av, "disable") == 0 || 2598 _substrcmp(*av, "enable") == 0 ) { 2599 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2600 2601 av++; 2602 masks[0] = masks[1] = 0; 2603 2604 while (av[0]) { 2605 if (isdigit(**av)) { 2606 i = atoi(*av); 2607 if (i < 0 || i > RESVD_SET) 2608 errx(EX_DATAERR, 2609 "invalid set number %d\n", i); 2610 masks[which] |= (1<<i); 2611 } else if (_substrcmp(*av, "disable") == 0) 2612 which = 0; 2613 else if (_substrcmp(*av, "enable") == 0) 2614 which = 1; 2615 else 2616 errx(EX_DATAERR, 2617 "invalid set command %s\n", *av); 2618 av++; 2619 } 2620 if ( (masks[0] & masks[1]) != 0 ) 2621 errx(EX_DATAERR, 2622 "cannot enable and disable the same set\n"); 2623 2624 rt.set = masks[0]; 2625 rt.new_set = masks[1]; 2626 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2627 if (i) 2628 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2629 } else 2630 errx(EX_USAGE, "invalid set command %s\n", *av); 2631 } 2632 2633 void 2634 ipfw_sysctl_handler(char *av[], int which) 2635 { 2636 av++; 2637 2638 if (av[0] == NULL) { 2639 warnx("missing keyword to enable/disable\n"); 2640 } else if (_substrcmp(*av, "firewall") == 0) { 2641 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2642 &which, sizeof(which)); 2643 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2644 &which, sizeof(which)); 2645 } else if (_substrcmp(*av, "one_pass") == 0) { 2646 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2647 &which, sizeof(which)); 2648 } else if (_substrcmp(*av, "debug") == 0) { 2649 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2650 &which, sizeof(which)); 2651 } else if (_substrcmp(*av, "verbose") == 0) { 2652 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2653 &which, sizeof(which)); 2654 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2655 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2656 &which, sizeof(which)); 2657 #ifndef NO_ALTQ 2658 } else if (_substrcmp(*av, "altq") == 0) { 2659 altq_set_enabled(which); 2660 #endif 2661 } else { 2662 warnx("unrecognize enable/disable keyword: %s\n", *av); 2663 } 2664 } 2665 2666 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2667 void *arg, void *state); 2668 2669 static void 2670 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2671 void *arg __unused, void *_state) 2672 { 2673 ipfw_dyn_rule *d; 2674 int width; 2675 uint8_t set; 2676 2677 d = (ipfw_dyn_rule *)_state; 2678 /* Count _ALL_ states */ 2679 fo->dcnt++; 2680 2681 if (fo->show_counters == 0) 2682 return; 2683 2684 if (co->use_set) { 2685 /* skip states from another set */ 2686 bcopy((char *)&d->rule + sizeof(uint16_t), &set, 2687 sizeof(uint8_t)); 2688 if (set != co->use_set - 1) 2689 return; 2690 } 2691 2692 width = pr_u64(NULL, &d->pcnt, 0); 2693 if (width > fo->pcwidth) 2694 fo->pcwidth = width; 2695 2696 width = pr_u64(NULL, &d->bcnt, 0); 2697 if (width > fo->bcwidth) 2698 fo->bcwidth = width; 2699 } 2700 2701 static int 2702 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2703 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2704 { 2705 int ttype; 2706 state_cb *fptr; 2707 void *farg; 2708 ipfw_obj_tlv *tlv; 2709 ipfw_obj_ctlv *ctlv; 2710 2711 fptr = NULL; 2712 ttype = 0; 2713 2714 while (sz > 0) { 2715 ctlv = (ipfw_obj_ctlv *)base; 2716 switch (ctlv->head.type) { 2717 case IPFW_TLV_DYNSTATE_LIST: 2718 base += sizeof(*ctlv); 2719 sz -= sizeof(*ctlv); 2720 ttype = IPFW_TLV_DYN_ENT; 2721 fptr = dyn_bc; 2722 farg = dyn_arg; 2723 break; 2724 default: 2725 return (sz); 2726 } 2727 2728 while (sz > 0) { 2729 tlv = (ipfw_obj_tlv *)base; 2730 if (tlv->type != ttype) 2731 break; 2732 2733 fptr(co, fo, farg, tlv + 1); 2734 sz -= tlv->length; 2735 base += tlv->length; 2736 } 2737 } 2738 2739 return (sz); 2740 } 2741 2742 static void 2743 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2744 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2745 { 2746 int bcwidth, pcwidth, width; 2747 int n; 2748 struct ip_fw_bcounter *cntr; 2749 struct ip_fw_rule *r; 2750 2751 bcwidth = 0; 2752 pcwidth = 0; 2753 if (fo->show_counters != 0) { 2754 for (n = 0; n < rcnt; n++, 2755 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2756 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2757 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2758 /* skip rules from another set */ 2759 if (co->use_set && r->set != co->use_set - 1) 2760 continue; 2761 2762 /* packet counter */ 2763 width = pr_u64(NULL, &cntr->pcnt, 0); 2764 if (width > pcwidth) 2765 pcwidth = width; 2766 2767 /* byte counter */ 2768 width = pr_u64(NULL, &cntr->bcnt, 0); 2769 if (width > bcwidth) 2770 bcwidth = width; 2771 } 2772 } 2773 fo->bcwidth = bcwidth; 2774 fo->pcwidth = pcwidth; 2775 2776 fo->dcnt = 0; 2777 if (co->do_dynamic && dynsz > 0) 2778 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2779 } 2780 2781 static int 2782 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2783 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2784 { 2785 int n, seen; 2786 struct ip_fw_rule *r; 2787 struct ip_fw_bcounter *cntr; 2788 2789 for (n = seen = 0; n < rcnt; n++, 2790 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2791 2792 if ((fo->show_counters | fo->show_time) != 0) { 2793 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2794 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2795 } else { 2796 cntr = NULL; 2797 r = (struct ip_fw_rule *)(rtlv + 1); 2798 } 2799 if (r->rulenum > fo->last) 2800 break; 2801 if (co->use_set && r->set != co->use_set - 1) 2802 continue; 2803 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2804 show_static_rule(co, fo, bp, r, cntr); 2805 printf("%s", bp->buf); 2806 bp_flush(bp); 2807 seen++; 2808 } 2809 } 2810 2811 return (seen); 2812 } 2813 2814 static void 2815 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2816 void *_arg, void *_state) 2817 { 2818 uint16_t rulenum; 2819 uint8_t set; 2820 ipfw_dyn_rule *d; 2821 struct buf_pr *bp; 2822 2823 d = (ipfw_dyn_rule *)_state; 2824 bp = (struct buf_pr *)_arg; 2825 2826 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2827 if (rulenum > fo->last) 2828 return; 2829 if (co->use_set) { 2830 bcopy((char *)&d->rule + sizeof(uint16_t), 2831 &set, sizeof(uint8_t)); 2832 if (set != co->use_set - 1) 2833 return; 2834 } 2835 if (rulenum >= fo->first) { 2836 show_dyn_state(co, fo, bp, d); 2837 printf("%s\n", bp->buf); 2838 bp_flush(bp); 2839 } 2840 } 2841 2842 static int 2843 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2844 struct buf_pr *bp, caddr_t base, size_t sz) 2845 { 2846 2847 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2848 return (sz); 2849 } 2850 2851 void 2852 ipfw_list(int ac, char *av[], int show_counters) 2853 { 2854 ipfw_cfg_lheader *cfg; 2855 struct format_opts sfo; 2856 size_t sz; 2857 int error; 2858 int lac; 2859 char **lav; 2860 uint32_t rnum; 2861 char *endptr; 2862 2863 if (g_co.test_only) { 2864 fprintf(stderr, "Testing only, list disabled\n"); 2865 return; 2866 } 2867 if (g_co.do_pipe) { 2868 dummynet_list(ac, av, show_counters); 2869 return; 2870 } 2871 2872 ac--; 2873 av++; 2874 memset(&sfo, 0, sizeof(sfo)); 2875 2876 /* Determine rule range to request */ 2877 if (ac > 0) { 2878 for (lac = ac, lav = av; lac != 0; lac--) { 2879 rnum = strtoul(*lav++, &endptr, 10); 2880 if (sfo.first == 0 || rnum < sfo.first) 2881 sfo.first = rnum; 2882 2883 if (*endptr == '-') 2884 rnum = strtoul(endptr + 1, &endptr, 10); 2885 if (sfo.last == 0 || rnum > sfo.last) 2886 sfo.last = rnum; 2887 } 2888 } 2889 2890 /* get configuration from kernel */ 2891 cfg = NULL; 2892 sfo.show_counters = show_counters; 2893 sfo.show_time = g_co.do_time; 2894 if (g_co.do_dynamic != 2) 2895 sfo.flags |= IPFW_CFG_GET_STATIC; 2896 if (g_co.do_dynamic != 0) 2897 sfo.flags |= IPFW_CFG_GET_STATES; 2898 if ((sfo.show_counters | sfo.show_time) != 0) 2899 sfo.flags |= IPFW_CFG_GET_COUNTERS; 2900 if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0) 2901 err(EX_OSERR, "retrieving config failed"); 2902 2903 error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av); 2904 2905 free(cfg); 2906 2907 if (error != EX_OK) 2908 exit(error); 2909 } 2910 2911 static int 2912 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 2913 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 2914 { 2915 caddr_t dynbase; 2916 size_t dynsz; 2917 int rcnt; 2918 int exitval = EX_OK; 2919 int lac; 2920 char **lav; 2921 char *endptr; 2922 size_t readsz; 2923 struct buf_pr bp; 2924 ipfw_obj_ctlv *ctlv; 2925 ipfw_obj_tlv *rbase; 2926 2927 /* 2928 * Handle tablenames TLV first, if any 2929 */ 2930 rbase = NULL; 2931 dynbase = NULL; 2932 dynsz = 0; 2933 readsz = sizeof(*cfg); 2934 rcnt = 0; 2935 2936 fo->set_mask = cfg->set_mask; 2937 2938 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 2939 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 2940 object_sort_ctlv(ctlv); 2941 fo->tstate = ctlv; 2942 readsz += ctlv->head.length; 2943 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 2944 } 2945 2946 if (cfg->flags & IPFW_CFG_GET_STATIC) { 2947 /* We've requested static rules */ 2948 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 2949 rbase = (ipfw_obj_tlv *)(ctlv + 1); 2950 rcnt = ctlv->count; 2951 readsz += ctlv->head.length; 2952 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2953 ctlv->head.length); 2954 } 2955 } 2956 2957 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 2958 /* We may have some dynamic states */ 2959 dynsz = sz - readsz; 2960 /* Skip empty header */ 2961 if (dynsz != sizeof(ipfw_obj_ctlv)) 2962 dynbase = (caddr_t)ctlv; 2963 else 2964 dynsz = 0; 2965 } 2966 2967 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 2968 bp_alloc(&bp, 4096); 2969 2970 /* if no rule numbers were specified, list all rules */ 2971 if (ac == 0) { 2972 fo->first = 0; 2973 fo->last = IPFW_DEFAULT_RULE; 2974 if (cfg->flags & IPFW_CFG_GET_STATIC) 2975 list_static_range(co, fo, &bp, rbase, rcnt); 2976 2977 if (co->do_dynamic && dynsz > 0) { 2978 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, 2979 dynsz); 2980 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2981 } 2982 2983 bp_free(&bp); 2984 return (EX_OK); 2985 } 2986 2987 /* display specific rules requested on command line */ 2988 for (lac = ac, lav = av; lac != 0; lac--) { 2989 /* convert command line rule # */ 2990 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2991 if (*endptr == '-') 2992 fo->last = strtoul(endptr + 1, &endptr, 10); 2993 if (*endptr) { 2994 exitval = EX_USAGE; 2995 warnx("invalid rule number: %s", *(lav - 1)); 2996 continue; 2997 } 2998 2999 if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0) 3000 continue; 3001 3002 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 3003 /* give precedence to other error(s) */ 3004 if (exitval == EX_OK) 3005 exitval = EX_UNAVAILABLE; 3006 if (fo->first == fo->last) 3007 warnx("rule %u does not exist", fo->first); 3008 else 3009 warnx("no rules in range %u-%u", 3010 fo->first, fo->last); 3011 } 3012 } 3013 3014 if (co->do_dynamic && dynsz > 0) { 3015 printf("## Dynamic rules:\n"); 3016 for (lac = ac, lav = av; lac != 0; lac--) { 3017 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 3018 if (*endptr == '-') 3019 fo->last = strtoul(endptr+1, &endptr, 10); 3020 if (*endptr) 3021 /* already warned */ 3022 continue; 3023 list_dyn_range(co, fo, &bp, dynbase, dynsz); 3024 } 3025 } 3026 3027 bp_free(&bp); 3028 return (exitval); 3029 } 3030 3031 3032 /* 3033 * Retrieves current ipfw configuration of given type 3034 * and stores its pointer to @pcfg. 3035 * 3036 * Caller is responsible for freeing @pcfg. 3037 * 3038 * Returns 0 on success. 3039 */ 3040 3041 static int 3042 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 3043 ipfw_cfg_lheader **pcfg, size_t *psize) 3044 { 3045 ipfw_cfg_lheader *cfg; 3046 size_t sz; 3047 int i; 3048 3049 3050 if (co->test_only != 0) { 3051 fprintf(stderr, "Testing only, list disabled\n"); 3052 return (0); 3053 } 3054 3055 /* Start with some data size */ 3056 sz = 4096; 3057 cfg = NULL; 3058 3059 for (i = 0; i < 16; i++) { 3060 if (cfg != NULL) 3061 free(cfg); 3062 if ((cfg = calloc(1, sz)) == NULL) 3063 return (ENOMEM); 3064 3065 cfg->flags = fo->flags; 3066 cfg->start_rule = fo->first; 3067 cfg->end_rule = fo->last; 3068 3069 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 3070 if (errno != ENOMEM) { 3071 free(cfg); 3072 return (errno); 3073 } 3074 3075 /* Buffer size is not enough. Try to increase */ 3076 sz = sz * 2; 3077 if (sz < cfg->size) 3078 sz = cfg->size; 3079 continue; 3080 } 3081 3082 *pcfg = cfg; 3083 *psize = sz; 3084 return (0); 3085 } 3086 3087 free(cfg); 3088 return (ENOMEM); 3089 } 3090 3091 static int 3092 lookup_host (char *host, struct in_addr *ipaddr) 3093 { 3094 struct hostent *he; 3095 3096 if (!inet_aton(host, ipaddr)) { 3097 if ((he = gethostbyname(host)) == NULL) 3098 return(-1); 3099 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 3100 } 3101 return(0); 3102 } 3103 3104 struct tidx { 3105 ipfw_obj_ntlv *idx; 3106 uint32_t count; 3107 uint32_t size; 3108 uint16_t counter; 3109 uint8_t set; 3110 }; 3111 3112 int 3113 ipfw_check_object_name(const char *name) 3114 { 3115 int c, i, l; 3116 3117 /* 3118 * Check that name is null-terminated and contains 3119 * valid symbols only. Valid mask is: 3120 * [a-zA-Z0-9\-_\.]{1,63} 3121 */ 3122 l = strlen(name); 3123 if (l == 0 || l >= 64) 3124 return (EINVAL); 3125 for (i = 0; i < l; i++) { 3126 c = name[i]; 3127 if (isalpha(c) || isdigit(c) || c == '_' || 3128 c == '-' || c == '.') 3129 continue; 3130 return (EINVAL); 3131 } 3132 return (0); 3133 } 3134 3135 static const char *default_state_name = "default"; 3136 3137 static int 3138 state_check_name(const char *name) 3139 { 3140 3141 if (ipfw_check_object_name(name) != 0) 3142 return (EINVAL); 3143 if (strcmp(name, "any") == 0) 3144 return (EINVAL); 3145 return (0); 3146 } 3147 3148 static int 3149 eaction_check_name(const char *name) 3150 { 3151 3152 if (ipfw_check_object_name(name) != 0) 3153 return (EINVAL); 3154 /* Restrict some 'special' names */ 3155 if (match_token(rule_actions, name) != -1 && 3156 match_token(rule_action_params, name) != -1) 3157 return (EINVAL); 3158 return (0); 3159 } 3160 3161 static uint16_t 3162 pack_object(struct tidx *tstate, const char *name, int otype) 3163 { 3164 ipfw_obj_ntlv *ntlv; 3165 uint32_t i; 3166 3167 for (i = 0; i < tstate->count; i++) { 3168 if (strcmp(tstate->idx[i].name, name) != 0) 3169 continue; 3170 if (tstate->idx[i].set != tstate->set) 3171 continue; 3172 if (tstate->idx[i].head.type != otype) 3173 continue; 3174 3175 return (tstate->idx[i].idx); 3176 } 3177 3178 if (tstate->count + 1 > tstate->size) { 3179 tstate->size += 4; 3180 tstate->idx = realloc(tstate->idx, tstate->size * 3181 sizeof(ipfw_obj_ntlv)); 3182 if (tstate->idx == NULL) 3183 return (0); 3184 } 3185 3186 ntlv = &tstate->idx[i]; 3187 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 3188 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 3189 ntlv->head.type = otype; 3190 ntlv->head.length = sizeof(ipfw_obj_ntlv); 3191 ntlv->set = tstate->set; 3192 ntlv->idx = ++tstate->counter; 3193 tstate->count++; 3194 3195 return (ntlv->idx); 3196 } 3197 3198 static uint16_t 3199 pack_table(struct tidx *tstate, const char *name) 3200 { 3201 3202 if (table_check_name(name) != 0) 3203 return (0); 3204 3205 return (pack_object(tstate, name, IPFW_TLV_TBL_NAME)); 3206 } 3207 3208 void 3209 fill_table(struct _ipfw_insn *cmd, char *av, uint8_t opcode, 3210 struct tidx *tstate) 3211 { 3212 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3213 uint16_t uidx; 3214 char *p; 3215 3216 if ((p = strchr(av + 6, ')')) == NULL) 3217 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 3218 *p = '\0'; 3219 p = strchr(av + 6, ','); 3220 if (p) 3221 *p++ = '\0'; 3222 3223 if ((uidx = pack_table(tstate, av + 6)) == 0) 3224 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 3225 3226 cmd->opcode = opcode; 3227 cmd->arg1 = uidx; 3228 if (p) { 3229 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3230 d[0] = strtoul(p, NULL, 0); 3231 } else 3232 cmd->len |= F_INSN_SIZE(ipfw_insn); 3233 } 3234 3235 3236 /* 3237 * fills the addr and mask fields in the instruction as appropriate from av. 3238 * Update length as appropriate. 3239 * The following formats are allowed: 3240 * me returns O_IP_*_ME 3241 * 1.2.3.4 single IP address 3242 * 1.2.3.4:5.6.7.8 address:mask 3243 * 1.2.3.4/24 address/mask 3244 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 3245 * We can have multiple comma-separated address/mask entries. 3246 */ 3247 static void 3248 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 3249 { 3250 int len = 0; 3251 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3252 3253 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 3254 3255 if (_substrcmp(av, "any") == 0) 3256 return; 3257 3258 if (_substrcmp(av, "me") == 0) { 3259 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 3260 return; 3261 } 3262 3263 if (strncmp(av, "table(", 6) == 0) { 3264 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 3265 return; 3266 } 3267 3268 while (av) { 3269 /* 3270 * After the address we can have '/' or ':' indicating a mask, 3271 * ',' indicating another address follows, '{' indicating a 3272 * set of addresses of unspecified size. 3273 */ 3274 char *t = NULL, *p = strpbrk(av, "/:,{"); 3275 int masklen; 3276 char md, nd = '\0'; 3277 3278 CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len); 3279 3280 if (p) { 3281 md = *p; 3282 *p++ = '\0'; 3283 if ((t = strpbrk(p, ",{")) != NULL) { 3284 nd = *t; 3285 *t = '\0'; 3286 } 3287 } else 3288 md = '\0'; 3289 3290 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 3291 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 3292 switch (md) { 3293 case ':': 3294 if (!inet_aton(p, (struct in_addr *)&d[1])) 3295 errx(EX_DATAERR, "bad netmask ``%s''", p); 3296 break; 3297 case '/': 3298 masklen = atoi(p); 3299 if (masklen == 0) 3300 d[1] = htonl(0U); /* mask */ 3301 else if (masklen > 32) 3302 errx(EX_DATAERR, "bad width ``%s''", p); 3303 else 3304 d[1] = htonl(~0U << (32 - masklen)); 3305 break; 3306 case '{': /* no mask, assume /24 and put back the '{' */ 3307 d[1] = htonl(~0U << (32 - 24)); 3308 *(--p) = md; 3309 break; 3310 3311 case ',': /* single address plus continuation */ 3312 *(--p) = md; 3313 /* FALLTHROUGH */ 3314 case 0: /* initialization value */ 3315 default: 3316 d[1] = htonl(~0U); /* force /32 */ 3317 break; 3318 } 3319 d[0] &= d[1]; /* mask base address with mask */ 3320 if (t) 3321 *t = nd; 3322 /* find next separator */ 3323 if (p) 3324 p = strpbrk(p, ",{"); 3325 if (p && *p == '{') { 3326 /* 3327 * We have a set of addresses. They are stored as follows: 3328 * arg1 is the set size (powers of 2, 2..256) 3329 * addr is the base address IN HOST FORMAT 3330 * mask.. is an array of arg1 bits (rounded up to 3331 * the next multiple of 32) with bits set 3332 * for each host in the map. 3333 */ 3334 uint32_t *map = (uint32_t *)&cmd->mask; 3335 int low, high; 3336 int i = contigmask((uint8_t *)&(d[1]), 32); 3337 3338 if (len > 0) 3339 errx(EX_DATAERR, "address set cannot be in a list"); 3340 if (i < 24 || i > 31) 3341 errx(EX_DATAERR, "invalid set with mask %d\n", i); 3342 cmd->o.arg1 = 1<<(32-i); /* map length */ 3343 d[0] = ntohl(d[0]); /* base addr in host format */ 3344 cmd->o.opcode = O_IP_DST_SET; /* default */ 3345 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 3346 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 3347 map[i] = 0; /* clear map */ 3348 3349 av = p + 1; 3350 low = d[0] & 0xff; 3351 high = low + cmd->o.arg1 - 1; 3352 /* 3353 * Here, i stores the previous value when we specify a range 3354 * of addresses within a mask, e.g. 45-63. i = -1 means we 3355 * have no previous value. 3356 */ 3357 i = -1; /* previous value in a range */ 3358 while (isdigit(*av)) { 3359 char *s; 3360 int a = strtol(av, &s, 0); 3361 3362 if (s == av) { /* no parameter */ 3363 if (*av != '}') 3364 errx(EX_DATAERR, "set not closed\n"); 3365 if (i != -1) 3366 errx(EX_DATAERR, "incomplete range %d-", i); 3367 break; 3368 } 3369 if (a < low || a > high) 3370 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 3371 a, low, high); 3372 a -= low; 3373 if (i == -1) /* no previous in range */ 3374 i = a; 3375 else { /* check that range is valid */ 3376 if (i > a) 3377 errx(EX_DATAERR, "invalid range %d-%d", 3378 i+low, a+low); 3379 if (*s == '-') 3380 errx(EX_DATAERR, "double '-' in range"); 3381 } 3382 for (; i <= a; i++) 3383 map[i/32] |= 1<<(i & 31); 3384 i = -1; 3385 if (*s == '-') 3386 i = a; 3387 else if (*s == '}') 3388 break; 3389 av = s+1; 3390 } 3391 return; 3392 } 3393 av = p; 3394 if (av) /* then *av must be a ',' */ 3395 av++; 3396 3397 /* Check this entry */ 3398 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 3399 /* 3400 * 'any' turns the entire list into a NOP. 3401 * 'not any' never matches, so it is removed from the 3402 * list unless it is the only item, in which case we 3403 * report an error. 3404 */ 3405 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 3406 if (av == NULL && len == 0) /* only this entry */ 3407 errx(EX_DATAERR, "not any never matches"); 3408 } 3409 /* else do nothing and skip this entry */ 3410 return; 3411 } 3412 /* A single IP can be stored in an optimized format */ 3413 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 3414 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 3415 return; 3416 } 3417 len += 2; /* two words... */ 3418 d += 2; 3419 } /* end while */ 3420 if (len + 1 > F_LEN_MASK) 3421 errx(EX_DATAERR, "address list too long"); 3422 cmd->o.len |= len+1; 3423 } 3424 3425 3426 /* n2mask sets n bits of the mask */ 3427 void 3428 n2mask(struct in6_addr *mask, int n) 3429 { 3430 static int minimask[9] = 3431 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 3432 u_char *p; 3433 3434 memset(mask, 0, sizeof(struct in6_addr)); 3435 p = (u_char *) mask; 3436 for (; n > 0; p++, n -= 8) { 3437 if (n >= 8) 3438 *p = 0xff; 3439 else 3440 *p = minimask[n]; 3441 } 3442 return; 3443 } 3444 3445 static void 3446 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 3447 struct _s_x *flags, char *p) 3448 { 3449 char *e; 3450 uint32_t set = 0, clear = 0; 3451 3452 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3453 errx(EX_DATAERR, "invalid flag %s", e); 3454 3455 cmd->opcode = opcode; 3456 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3457 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3458 } 3459 3460 3461 void 3462 ipfw_delete(char *av[]) 3463 { 3464 ipfw_range_tlv rt; 3465 char *sep; 3466 int i, j; 3467 int exitval = EX_OK; 3468 int do_set = 0; 3469 3470 av++; 3471 NEED1("missing rule specification"); 3472 if ( *av && _substrcmp(*av, "set") == 0) { 3473 /* Do not allow using the following syntax: 3474 * ipfw set N delete set M 3475 */ 3476 if (g_co.use_set) 3477 errx(EX_DATAERR, "invalid syntax"); 3478 do_set = 1; /* delete set */ 3479 av++; 3480 } 3481 3482 /* Rule number */ 3483 while (*av && isdigit(**av)) { 3484 i = strtol(*av, &sep, 10); 3485 j = i; 3486 if (*sep== '-') 3487 j = strtol(sep + 1, NULL, 10); 3488 av++; 3489 if (g_co.do_nat) { 3490 exitval = ipfw_delete_nat(i); 3491 } else if (g_co.do_pipe) { 3492 exitval = ipfw_delete_pipe(g_co.do_pipe, i); 3493 } else { 3494 memset(&rt, 0, sizeof(rt)); 3495 if (do_set != 0) { 3496 rt.set = i & 31; 3497 rt.flags = IPFW_RCFLAG_SET; 3498 } else { 3499 rt.start_rule = i & 0xffff; 3500 rt.end_rule = j & 0xffff; 3501 if (rt.start_rule == 0 && rt.end_rule == 0) 3502 rt.flags |= IPFW_RCFLAG_ALL; 3503 else 3504 rt.flags |= IPFW_RCFLAG_RANGE; 3505 if (g_co.use_set != 0) { 3506 rt.set = g_co.use_set - 1; 3507 rt.flags |= IPFW_RCFLAG_SET; 3508 } 3509 } 3510 if (g_co.do_dynamic == 2) 3511 rt.flags |= IPFW_RCFLAG_DYNAMIC; 3512 i = do_range_cmd(IP_FW_XDEL, &rt); 3513 if (i != 0) { 3514 exitval = EX_UNAVAILABLE; 3515 if (g_co.do_quiet) 3516 continue; 3517 warn("rule %u: setsockopt(IP_FW_XDEL)", 3518 rt.start_rule); 3519 } else if (rt.new_set == 0 && do_set == 0 && 3520 g_co.do_dynamic != 2) { 3521 exitval = EX_UNAVAILABLE; 3522 if (g_co.do_quiet) 3523 continue; 3524 if (rt.start_rule != rt.end_rule) 3525 warnx("no rules in %u-%u range", 3526 rt.start_rule, rt.end_rule); 3527 else 3528 warnx("rule %u not found", 3529 rt.start_rule); 3530 } 3531 } 3532 } 3533 if (exitval != EX_OK && g_co.do_force == 0) 3534 exit(exitval); 3535 } 3536 3537 3538 /* 3539 * fill the interface structure. We do not check the name as we can 3540 * create interfaces dynamically, so checking them at insert time 3541 * makes relatively little sense. 3542 * Interface names containing '*', '?', or '[' are assumed to be shell 3543 * patterns which match interfaces. 3544 */ 3545 static void 3546 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3547 { 3548 char *p; 3549 uint16_t uidx; 3550 3551 cmd->name[0] = '\0'; 3552 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3553 3554 CHECK_CMDLEN; 3555 3556 /* Parse the interface or address */ 3557 if (strcmp(arg, "any") == 0) 3558 cmd->o.len = 0; /* effectively ignore this command */ 3559 else if (strncmp(arg, "table(", 6) == 0) { 3560 if ((p = strchr(arg + 6, ')')) == NULL) 3561 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3562 *p = '\0'; 3563 p = strchr(arg + 6, ','); 3564 if (p) 3565 *p++ = '\0'; 3566 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3567 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3568 3569 cmd->name[0] = '\1'; /* Special value indicating table */ 3570 cmd->p.kidx = uidx; 3571 } else if (!isdigit(*arg)) { 3572 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3573 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3574 } else if (!inet_aton(arg, &cmd->p.ip)) 3575 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3576 } 3577 3578 static void 3579 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3580 { 3581 int i; 3582 size_t l; 3583 char *ap, *ptr, *optr; 3584 struct ether_addr *mac; 3585 const char *macset = "0123456789abcdefABCDEF:"; 3586 3587 if (strcmp(p, "any") == 0) { 3588 for (i = 0; i < ETHER_ADDR_LEN; i++) 3589 addr[i] = mask[i] = 0; 3590 return; 3591 } 3592 3593 optr = ptr = strdup(p); 3594 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3595 l = strlen(ap); 3596 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3597 errx(EX_DATAERR, "Incorrect MAC address"); 3598 bcopy(mac, addr, ETHER_ADDR_LEN); 3599 } else 3600 errx(EX_DATAERR, "Incorrect MAC address"); 3601 3602 if (ptr != NULL) { /* we have mask? */ 3603 if (p[ptr - optr - 1] == '/') { /* mask len */ 3604 long ml = strtol(ptr, &ap, 10); 3605 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3606 errx(EX_DATAERR, "Incorrect mask length"); 3607 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3608 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3609 } else { /* mask */ 3610 l = strlen(ptr); 3611 if (strspn(ptr, macset) != l || 3612 (mac = ether_aton(ptr)) == NULL) 3613 errx(EX_DATAERR, "Incorrect mask"); 3614 bcopy(mac, mask, ETHER_ADDR_LEN); 3615 } 3616 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3617 for (i = 0; i < ETHER_ADDR_LEN; i++) 3618 mask[i] = 0xff; 3619 } 3620 for (i = 0; i < ETHER_ADDR_LEN; i++) 3621 addr[i] &= mask[i]; 3622 3623 free(optr); 3624 } 3625 3626 /* 3627 * helper function, updates the pointer to cmd with the length 3628 * of the current command, and also cleans up the first word of 3629 * the new command in case it has been clobbered before. 3630 */ 3631 static ipfw_insn * 3632 next_cmd(ipfw_insn *cmd, int *len) 3633 { 3634 *len -= F_LEN(cmd); 3635 CHECK_LENGTH(*len, 0); 3636 cmd += F_LEN(cmd); 3637 bzero(cmd, sizeof(*cmd)); 3638 return cmd; 3639 } 3640 3641 /* 3642 * Takes arguments and copies them into a comment 3643 */ 3644 static void 3645 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3646 { 3647 int i, l; 3648 char *p = (char *)(cmd + 1); 3649 3650 cmd->opcode = O_NOP; 3651 cmd->len = (cmd->len & (F_NOT | F_OR)); 3652 3653 /* Compute length of comment string. */ 3654 for (i = 0, l = 0; av[i] != NULL; i++) 3655 l += strlen(av[i]) + 1; 3656 if (l == 0) 3657 return; 3658 if (l > 84) 3659 errx(EX_DATAERR, 3660 "comment too long (max 80 chars)"); 3661 l = 1 + (l+3)/4; 3662 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3663 CHECK_CMDLEN; 3664 3665 for (i = 0; av[i] != NULL; i++) { 3666 strcpy(p, av[i]); 3667 p += strlen(av[i]); 3668 *p++ = ' '; 3669 } 3670 *(--p) = '\0'; 3671 } 3672 3673 /* 3674 * A function to fill simple commands of size 1. 3675 * Existing flags are preserved. 3676 */ 3677 static void 3678 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3679 { 3680 cmd->opcode = opcode; 3681 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3682 cmd->arg1 = arg; 3683 } 3684 3685 /* 3686 * Fetch and add the MAC address and type, with masks. This generates one or 3687 * two microinstructions, and returns the pointer to the last one. 3688 */ 3689 static ipfw_insn * 3690 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3691 { 3692 ipfw_insn_mac *mac; 3693 3694 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3695 errx(EX_DATAERR, "MAC dst src"); 3696 3697 cmd->opcode = O_MACADDR2; 3698 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3699 CHECK_CMDLEN; 3700 3701 mac = (ipfw_insn_mac *)cmd; 3702 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3703 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3704 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3705 return cmd; 3706 } 3707 3708 static ipfw_insn * 3709 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3710 { 3711 if (!av) 3712 errx(EX_DATAERR, "missing MAC type"); 3713 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3714 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3715 cblen); 3716 cmd->opcode = O_MAC_TYPE; 3717 return cmd; 3718 } else 3719 return NULL; 3720 } 3721 3722 static ipfw_insn * 3723 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3724 { 3725 struct protoent *pe; 3726 char *ep; 3727 int proto; 3728 3729 proto = strtol(av, &ep, 10); 3730 if (*ep != '\0' || proto <= 0) { 3731 if ((pe = getprotobyname(av)) == NULL) 3732 return NULL; 3733 proto = pe->p_proto; 3734 } 3735 3736 fill_cmd(cmd, O_PROTO, 0, proto); 3737 *protop = proto; 3738 return cmd; 3739 } 3740 3741 static ipfw_insn * 3742 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3743 { 3744 u_char proto = IPPROTO_IP; 3745 3746 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3747 ; /* do not set O_IP4 nor O_IP6 */ 3748 else if (strcmp(av, "ip4") == 0) 3749 /* explicit "just IPv4" rule */ 3750 fill_cmd(cmd, O_IP4, 0, 0); 3751 else if (strcmp(av, "ip6") == 0) { 3752 /* explicit "just IPv6" rule */ 3753 proto = IPPROTO_IPV6; 3754 fill_cmd(cmd, O_IP6, 0, 0); 3755 } else 3756 return add_proto0(cmd, av, protop); 3757 3758 *protop = proto; 3759 return cmd; 3760 } 3761 3762 static ipfw_insn * 3763 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3764 { 3765 u_char proto = IPPROTO_IP; 3766 3767 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3768 ; /* do not set O_IP4 nor O_IP6 */ 3769 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3770 /* explicit "just IPv4" rule */ 3771 fill_cmd(cmd, O_IP4, 0, 0); 3772 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3773 /* explicit "just IPv6" rule */ 3774 proto = IPPROTO_IPV6; 3775 fill_cmd(cmd, O_IP6, 0, 0); 3776 } else 3777 return add_proto0(cmd, av, protop); 3778 3779 *protop = proto; 3780 return cmd; 3781 } 3782 3783 static ipfw_insn * 3784 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3785 { 3786 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3787 if (cmd->opcode == O_IP_DST_SET) /* set */ 3788 cmd->opcode = O_IP_SRC_SET; 3789 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3790 cmd->opcode = O_IP_SRC_LOOKUP; 3791 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3792 cmd->opcode = O_IP_SRC_ME; 3793 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3794 cmd->opcode = O_IP_SRC; 3795 else /* addr/mask */ 3796 cmd->opcode = O_IP_SRC_MASK; 3797 return cmd; 3798 } 3799 3800 static ipfw_insn * 3801 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3802 { 3803 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3804 if (cmd->opcode == O_IP_DST_SET) /* set */ 3805 ; 3806 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3807 ; 3808 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3809 cmd->opcode = O_IP_DST_ME; 3810 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3811 cmd->opcode = O_IP_DST; 3812 else /* addr/mask */ 3813 cmd->opcode = O_IP_DST_MASK; 3814 return cmd; 3815 } 3816 3817 static ipfw_insn * 3818 add_srcmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3819 { 3820 3821 if (strncmp(av, "table(", 6) == 0) 3822 fill_table(cmd, av, O_MAC_SRC_LOOKUP, tstate); 3823 else 3824 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3825 return cmd; 3826 } 3827 3828 static ipfw_insn * 3829 add_dstmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3830 { 3831 3832 if (strncmp(av, "table(", 6) == 0) 3833 fill_table(cmd, av, O_MAC_DST_LOOKUP, tstate); 3834 else 3835 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3836 return cmd; 3837 } 3838 3839 3840 static struct _s_x f_reserved_keywords[] = { 3841 { "altq", TOK_OR }, 3842 { "//", TOK_OR }, 3843 { "diverted", TOK_OR }, 3844 { "dst-port", TOK_OR }, 3845 { "src-port", TOK_OR }, 3846 { "established", TOK_OR }, 3847 { "keep-state", TOK_OR }, 3848 { "frag", TOK_OR }, 3849 { "icmptypes", TOK_OR }, 3850 { "in", TOK_OR }, 3851 { "out", TOK_OR }, 3852 { "ip6", TOK_OR }, 3853 { "any", TOK_OR }, 3854 { "to", TOK_OR }, 3855 { "via", TOK_OR }, 3856 { "{", TOK_OR }, 3857 { NULL, 0 } /* terminator */ 3858 }; 3859 3860 static ipfw_insn * 3861 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3862 { 3863 3864 if (match_token(f_reserved_keywords, av) != -1) 3865 return (NULL); 3866 3867 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3868 /* XXX todo: check that we have a protocol with ports */ 3869 cmd->opcode = opcode; 3870 return cmd; 3871 } 3872 return NULL; 3873 } 3874 3875 static ipfw_insn * 3876 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3877 { 3878 struct in6_addr a; 3879 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3880 ipfw_insn *ret = NULL; 3881 size_t len; 3882 3883 /* Copy first address in set if needed */ 3884 if ((ch = strpbrk(av, "/,")) != NULL) { 3885 len = ch - av; 3886 strlcpy(buf, av, sizeof(buf)); 3887 if (len < sizeof(buf)) 3888 buf[len] = '\0'; 3889 host = buf; 3890 } else 3891 host = av; 3892 3893 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3894 inet_pton(AF_INET6, host, &a) == 1) 3895 ret = add_srcip6(cmd, av, cblen, tstate); 3896 /* XXX: should check for IPv4, not !IPv6 */ 3897 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3898 inet_pton(AF_INET6, host, &a) != 1)) 3899 ret = add_srcip(cmd, av, cblen, tstate); 3900 if (ret == NULL && strcmp(av, "any") != 0) 3901 ret = cmd; 3902 3903 return ret; 3904 } 3905 3906 static ipfw_insn * 3907 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3908 { 3909 struct in6_addr a; 3910 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3911 ipfw_insn *ret = NULL; 3912 size_t len; 3913 3914 /* Copy first address in set if needed */ 3915 if ((ch = strpbrk(av, "/,")) != NULL) { 3916 len = ch - av; 3917 strlcpy(buf, av, sizeof(buf)); 3918 if (len < sizeof(buf)) 3919 buf[len] = '\0'; 3920 host = buf; 3921 } else 3922 host = av; 3923 3924 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3925 inet_pton(AF_INET6, host, &a) == 1) 3926 ret = add_dstip6(cmd, av, cblen, tstate); 3927 /* XXX: should check for IPv4, not !IPv6 */ 3928 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3929 inet_pton(AF_INET6, host, &a) != 1)) 3930 ret = add_dstip(cmd, av, cblen, tstate); 3931 if (ret == NULL && strcmp(av, "any") != 0) 3932 ret = cmd; 3933 3934 return ret; 3935 } 3936 3937 static inline int 3938 arg_or_targ_relaxed(const char *arg, const char *action) 3939 { 3940 uint32_t arg1 = (uint32_t)(-1); 3941 3942 if (arg == NULL) 3943 errx(EX_USAGE, "missing argument for %s", action); 3944 if (isdigit(arg[0])) { 3945 arg1 = strtoul(arg, NULL, 10); 3946 if (arg1 <= 0 || arg1 >= IP_FW_TABLEARG) 3947 errx(EX_DATAERR, "illegal argument %s(%u) for %s", 3948 arg, arg1, action); 3949 } else if (_substrcmp(arg, "tablearg") == 0) 3950 arg1 = IP_FW_TARG; 3951 return (arg1); 3952 } 3953 3954 static inline uint16_t 3955 arg_or_targ(const char *arg, const char *action) 3956 { 3957 uint32_t arg1 = arg_or_targ_relaxed(arg, action); 3958 3959 if (arg1 == (uint32_t)(-1)) 3960 errx(EX_DATAERR, "illegal argument %s(%u) for %s", 3961 arg, arg1, action); 3962 return (arg1); 3963 } 3964 3965 static uint16_t 3966 get_divert_port(const char *arg, const char *action) 3967 { 3968 uint32_t arg1 = arg_or_targ_relaxed(arg, action); 3969 3970 if (arg1 != (uint32_t)(-1)) 3971 return (arg1); 3972 3973 struct servent *s; 3974 setservent(1); 3975 s = getservbyname(arg, "divert"); 3976 if (s == NULL) 3977 errx(EX_DATAERR, "illegal divert/tee port"); 3978 return (ntohs(s->s_port)); 3979 } 3980 3981 /* 3982 * Parse arguments and assemble the microinstructions which make up a rule. 3983 * Rules are added into the 'rulebuf' and then copied in the correct order 3984 * into the actual rule. 3985 * 3986 * The syntax for a rule starts with the action, followed by 3987 * optional action parameters, and the various match patterns. 3988 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 3989 * (generated if the rule includes a keep-state option), then the 3990 * various match patterns, log/altq actions, and the actual action. 3991 * 3992 */ 3993 static void 3994 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 3995 { 3996 /* 3997 * rules are added into the 'rulebuf' and then copied in 3998 * the correct order into the actual rule. 3999 * Some things that need to go out of order (prob, action etc.) 4000 * go into actbuf[]. 4001 */ 4002 static uint32_t actbuf[255], cmdbuf[255]; 4003 int rblen, ablen, cblen; 4004 4005 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 4006 ipfw_insn *first_cmd; /* first match pattern */ 4007 4008 struct ip_fw_rule *rule; 4009 4010 /* 4011 * various flags used to record that we entered some fields. 4012 */ 4013 ipfw_insn *have_state = NULL; /* any state-related option */ 4014 int have_rstate = 0; 4015 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 4016 ipfw_insn *have_skipcmd = NULL; 4017 size_t len; 4018 4019 int i; 4020 4021 int open_par = 0; /* open parenthesis ( */ 4022 4023 /* proto is here because it is used to fetch ports */ 4024 u_char proto = IPPROTO_IP; /* default protocol */ 4025 4026 double match_prob = 1; /* match probability, default is always match */ 4027 4028 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 4029 bzero(cmdbuf, sizeof(cmdbuf)); 4030 bzero(rbuf, *rbufsize); 4031 4032 rule = (struct ip_fw_rule *)rbuf; 4033 cmd = (ipfw_insn *)cmdbuf; 4034 action = (ipfw_insn *)actbuf; 4035 4036 rblen = *rbufsize / sizeof(uint32_t); 4037 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 4038 ablen = nitems(actbuf); 4039 cblen = nitems(cmdbuf); 4040 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 4041 4042 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 4043 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 4044 4045 av++; 4046 4047 /* [rule N] -- Rule number optional */ 4048 if (av[0] && isdigit(**av)) { 4049 rule->rulenum = atoi(*av); 4050 av++; 4051 } 4052 4053 /* [set N] -- set number (0..RESVD_SET), optional */ 4054 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 4055 int set = strtoul(av[1], NULL, 10); 4056 if (set < 0 || set > RESVD_SET) 4057 errx(EX_DATAERR, "illegal set %s", av[1]); 4058 rule->set = set; 4059 tstate->set = set; 4060 av += 2; 4061 } 4062 4063 /* [prob D] -- match probability, optional */ 4064 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 4065 match_prob = strtod(av[1], NULL); 4066 4067 if (match_prob <= 0 || match_prob > 1) 4068 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 4069 av += 2; 4070 } 4071 4072 /* action -- mandatory */ 4073 NEED1("missing action"); 4074 i = match_token(rule_actions, *av); 4075 av++; 4076 action->len = 1; /* default */ 4077 CHECK_ACTLEN; 4078 switch(i) { 4079 case TOK_CHECKSTATE: 4080 have_state = action; 4081 action->opcode = O_CHECK_STATE; 4082 if (*av == NULL || 4083 match_token(rule_options, *av) == TOK_COMMENT) { 4084 action->arg1 = pack_object(tstate, 4085 default_state_name, IPFW_TLV_STATE_NAME); 4086 break; 4087 } 4088 if (*av[0] == ':') { 4089 if (strcmp(*av + 1, "any") == 0) 4090 action->arg1 = 0; 4091 else if (state_check_name(*av + 1) == 0) 4092 action->arg1 = pack_object(tstate, *av + 1, 4093 IPFW_TLV_STATE_NAME); 4094 else 4095 errx(EX_DATAERR, "Invalid state name %s", 4096 *av); 4097 av++; 4098 break; 4099 } 4100 errx(EX_DATAERR, "Invalid state name %s", *av); 4101 break; 4102 4103 case TOK_ABORT: 4104 action->opcode = O_REJECT; 4105 action->arg1 = ICMP_REJECT_ABORT; 4106 break; 4107 4108 case TOK_ABORT6: 4109 action->opcode = O_UNREACH6; 4110 action->arg1 = ICMP6_UNREACH_ABORT; 4111 break; 4112 4113 case TOK_ACCEPT: 4114 action->opcode = O_ACCEPT; 4115 break; 4116 4117 case TOK_DENY: 4118 action->opcode = O_DENY; 4119 action->arg1 = 0; 4120 break; 4121 4122 case TOK_REJECT: 4123 action->opcode = O_REJECT; 4124 action->arg1 = ICMP_UNREACH_HOST; 4125 break; 4126 4127 case TOK_RESET: 4128 action->opcode = O_REJECT; 4129 action->arg1 = ICMP_REJECT_RST; 4130 break; 4131 4132 case TOK_RESET6: 4133 action->opcode = O_UNREACH6; 4134 action->arg1 = ICMP6_UNREACH_RST; 4135 break; 4136 4137 case TOK_UNREACH: 4138 action->opcode = O_REJECT; 4139 NEED1("missing reject code"); 4140 action->arg1 = get_reject_code(*av); 4141 av++; 4142 if (action->arg1 == ICMP_UNREACH_NEEDFRAG && isdigit(**av)) { 4143 uint16_t mtu; 4144 4145 mtu = strtoul(*av, NULL, 10); 4146 if (mtu < 68 || mtu >= IP_MAXPACKET) 4147 errx(EX_DATAERR, "illegal argument for %s", 4148 *(av - 1)); 4149 action->len = F_INSN_SIZE(ipfw_insn_u16); 4150 ((ipfw_insn_u16 *)action)->ports[0] = mtu; 4151 av++; 4152 } 4153 break; 4154 4155 case TOK_UNREACH6: 4156 action->opcode = O_UNREACH6; 4157 NEED1("missing unreach code"); 4158 action->arg1 = get_unreach6_code(*av); 4159 av++; 4160 break; 4161 4162 case TOK_COUNT: 4163 action->opcode = O_COUNT; 4164 break; 4165 4166 case TOK_NAT: 4167 action->opcode = O_NAT; 4168 action->len = F_INSN_SIZE(ipfw_insn_nat); 4169 CHECK_ACTLEN; 4170 if (*av != NULL && _substrcmp(*av, "global") == 0) 4171 action->arg1 = IP_FW_NAT44_GLOBAL; 4172 else 4173 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4174 av++; 4175 break; 4176 case TOK_QUEUE: 4177 action->opcode = O_QUEUE; 4178 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4179 av++; 4180 break; 4181 case TOK_PIPE: 4182 action->opcode = O_PIPE; 4183 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4184 av++; 4185 break; 4186 case TOK_SKIPTO: 4187 action->opcode = O_SKIPTO; 4188 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4189 av++; 4190 break; 4191 case TOK_NETGRAPH: 4192 action->opcode = O_NETGRAPH; 4193 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4194 av++; 4195 break; 4196 case TOK_NGTEE: 4197 action->opcode = O_NGTEE; 4198 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4199 av++; 4200 break; 4201 case TOK_DIVERT: 4202 action->opcode = O_DIVERT; 4203 action->arg1 = get_divert_port(av[0], *(av - 1)); 4204 av++; 4205 break; 4206 case TOK_TEE: 4207 action->opcode = O_TEE; 4208 action->arg1 = get_divert_port(av[0], *(av - 1)); 4209 av++; 4210 break; 4211 case TOK_CALL: 4212 action->opcode = O_CALLRETURN; 4213 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4214 av++; 4215 break; 4216 4217 case TOK_FORWARD: { 4218 /* 4219 * Locate the address-port separator (':' or ','). 4220 * Could be one of the following: 4221 * hostname:port 4222 * IPv4 a.b.c.d,port 4223 * IPv4 a.b.c.d:port 4224 * IPv6 w:x:y::z,port 4225 * IPv6 [w:x:y::z]:port 4226 */ 4227 struct sockaddr_storage result; 4228 struct addrinfo *res; 4229 char *s, *end; 4230 int family; 4231 u_short port_number = 0; 4232 4233 NEED1("missing forward address[:port]"); 4234 4235 if (strncmp(*av, "tablearg", 8) == 0 && 4236 ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':')) 4237 memcpy(++(*av), "0.0.0.0", 7); 4238 4239 /* 4240 * Are we an bracket-enclosed IPv6 address? 4241 */ 4242 if (strchr(*av, '[')) 4243 (*av)++; 4244 4245 /* 4246 * locate the address-port separator (':' or ',') 4247 */ 4248 s = strchr(*av, ','); 4249 if (s == NULL) { 4250 s = strchr(*av, ']'); 4251 /* Prevent erroneous parsing on brackets. */ 4252 if (s != NULL) 4253 *(s++) = '\0'; 4254 else 4255 s = *av; 4256 4257 /* Distinguish between IPv4:port and IPv6 cases. */ 4258 s = strchr(s, ':'); 4259 if (s && strchr(s+1, ':')) 4260 s = NULL; /* no port */ 4261 } 4262 4263 if (s != NULL) { 4264 /* Terminate host portion and set s to start of port. */ 4265 *(s++) = '\0'; 4266 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 4267 if (s == end) 4268 errx(EX_DATAERR, 4269 "illegal forwarding port ``%s''", s); 4270 port_number = (u_short)i; 4271 } 4272 4273 /* 4274 * Resolve the host name or address to a family and a 4275 * network representation of the address. 4276 */ 4277 if (getaddrinfo(*av, NULL, NULL, &res)) 4278 errx(EX_DATAERR, NULL); 4279 /* Just use the first host in the answer. */ 4280 family = res->ai_family; 4281 memcpy(&result, res->ai_addr, res->ai_addrlen); 4282 freeaddrinfo(res); 4283 4284 if (family == PF_INET) { 4285 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 4286 4287 action->opcode = O_FORWARD_IP; 4288 action->len = F_INSN_SIZE(ipfw_insn_sa); 4289 CHECK_ACTLEN; 4290 4291 /* 4292 * In the kernel we assume AF_INET and use only 4293 * sin_port and sin_addr. Remember to set sin_len as 4294 * the routing code seems to use it too. 4295 */ 4296 p->sa.sin_len = sizeof(struct sockaddr_in); 4297 p->sa.sin_family = AF_INET; 4298 p->sa.sin_port = port_number; 4299 p->sa.sin_addr.s_addr = 4300 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 4301 } else if (family == PF_INET6) { 4302 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 4303 4304 action->opcode = O_FORWARD_IP6; 4305 action->len = F_INSN_SIZE(ipfw_insn_sa6); 4306 CHECK_ACTLEN; 4307 4308 p->sa.sin6_len = sizeof(struct sockaddr_in6); 4309 p->sa.sin6_family = AF_INET6; 4310 p->sa.sin6_port = port_number; 4311 p->sa.sin6_flowinfo = 0; 4312 p->sa.sin6_scope_id = 4313 ((struct sockaddr_in6 *)&result)->sin6_scope_id; 4314 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 4315 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 4316 } else { 4317 errx(EX_DATAERR, "Invalid address family in forward action"); 4318 } 4319 av++; 4320 break; 4321 } 4322 case TOK_COMMENT: 4323 /* pretend it is a 'count' rule followed by the comment */ 4324 action->opcode = O_COUNT; 4325 av--; /* go back... */ 4326 break; 4327 4328 case TOK_SETFIB: 4329 { 4330 int numfibs; 4331 size_t intsize = sizeof(int); 4332 4333 action->opcode = O_SETFIB; 4334 NEED1("missing fib number"); 4335 if (_substrcmp(*av, "tablearg") == 0) { 4336 action->arg1 = IP_FW_TARG; 4337 } else { 4338 action->arg1 = strtoul(*av, NULL, 10); 4339 if (sysctlbyname("net.fibs", &numfibs, &intsize, 4340 NULL, 0) == -1) 4341 errx(EX_DATAERR, "fibs not supported.\n"); 4342 if (action->arg1 >= numfibs) /* Temporary */ 4343 errx(EX_DATAERR, "fib too large.\n"); 4344 /* Add high-order bit to fib to make room for tablearg*/ 4345 action->arg1 |= 0x8000; 4346 } 4347 av++; 4348 break; 4349 } 4350 4351 case TOK_SETDSCP: 4352 { 4353 int code; 4354 4355 action->opcode = O_SETDSCP; 4356 NEED1("missing DSCP code"); 4357 if (_substrcmp(*av, "tablearg") == 0) { 4358 action->arg1 = IP_FW_TARG; 4359 } else { 4360 if (isalpha(*av[0])) { 4361 if ((code = match_token(f_ipdscp, *av)) == -1) 4362 errx(EX_DATAERR, "Unknown DSCP code"); 4363 action->arg1 = code; 4364 } else 4365 action->arg1 = strtoul(*av, NULL, 10); 4366 /* 4367 * Add high-order bit to DSCP to make room 4368 * for tablearg 4369 */ 4370 action->arg1 |= 0x8000; 4371 } 4372 av++; 4373 break; 4374 } 4375 4376 case TOK_REASS: 4377 action->opcode = O_REASS; 4378 break; 4379 4380 case TOK_RETURN: 4381 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 4382 break; 4383 4384 case TOK_SETMARK: { 4385 action->opcode = O_SETMARK; 4386 action->len = F_INSN_SIZE(ipfw_insn_u32); 4387 NEED1("missing mark"); 4388 if (strcmp(*av, "tablearg") == 0) { 4389 action->arg1 = IP_FW_TARG; 4390 } else { 4391 ((ipfw_insn_u32 *)action)->d[0] = 4392 strtoul(*av, NULL, 0); 4393 /* This is not a tablearg */ 4394 action->arg1 |= 0x8000; 4395 } 4396 av++; 4397 CHECK_CMDLEN; 4398 break; 4399 } 4400 4401 case TOK_TCPSETMSS: { 4402 u_long mss; 4403 uint16_t idx; 4404 4405 idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION); 4406 if (idx == 0) 4407 errx(EX_DATAERR, "pack_object failed"); 4408 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4409 NEED1("Missing MSS value"); 4410 action = next_cmd(action, &ablen); 4411 action->len = 1; 4412 CHECK_ACTLEN; 4413 mss = strtoul(*av, NULL, 10); 4414 if (mss == 0 || mss > UINT16_MAX) 4415 errx(EX_USAGE, "invalid MSS value %s", *av); 4416 fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss); 4417 av++; 4418 break; 4419 } 4420 4421 default: 4422 av--; 4423 if (match_token(rule_eactions, *av) == -1) 4424 errx(EX_DATAERR, "invalid action %s\n", *av); 4425 /* 4426 * External actions support. 4427 * XXX: we support only syntax with instance name. 4428 * For known external actions (from rule_eactions list) 4429 * we can handle syntax directly. But with `eaction' 4430 * keyword we can use only `eaction <name> <instance>' 4431 * syntax. 4432 */ 4433 case TOK_EACTION: { 4434 uint16_t idx; 4435 4436 NEED1("Missing eaction name"); 4437 if (eaction_check_name(*av) != 0) 4438 errx(EX_DATAERR, "Invalid eaction name %s", *av); 4439 idx = pack_object(tstate, *av, IPFW_TLV_EACTION); 4440 if (idx == 0) 4441 errx(EX_DATAERR, "pack_object failed"); 4442 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4443 av++; 4444 NEED1("Missing eaction instance name"); 4445 action = next_cmd(action, &ablen); 4446 action->len = 1; 4447 CHECK_ACTLEN; 4448 if (eaction_check_name(*av) != 0) 4449 errx(EX_DATAERR, "Invalid eaction instance name %s", 4450 *av); 4451 /* 4452 * External action instance object has TLV type depended 4453 * from the external action name object index. Since we 4454 * currently don't know this index, use zero as TLV type. 4455 */ 4456 idx = pack_object(tstate, *av, 0); 4457 if (idx == 0) 4458 errx(EX_DATAERR, "pack_object failed"); 4459 fill_cmd(action, O_EXTERNAL_INSTANCE, 0, idx); 4460 av++; 4461 } 4462 } 4463 action = next_cmd(action, &ablen); 4464 4465 /* 4466 * [altq queuename] -- altq tag, optional 4467 * [log [logamount N]] -- log, optional 4468 * 4469 * If they exist, it go first in the cmdbuf, but then it is 4470 * skipped in the copy section to the end of the buffer. 4471 */ 4472 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 4473 av++; 4474 switch (i) { 4475 case TOK_LOG: 4476 { 4477 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 4478 int l; 4479 4480 if (have_log) 4481 errx(EX_DATAERR, 4482 "log cannot be specified more than once"); 4483 have_log = (ipfw_insn *)c; 4484 cmd->len = F_INSN_SIZE(ipfw_insn_log); 4485 CHECK_CMDLEN; 4486 cmd->opcode = O_LOG; 4487 if (av[0] && _substrcmp(*av, "logamount") == 0) { 4488 av++; 4489 NEED1("logamount requires argument"); 4490 l = atoi(*av); 4491 if (l < 0) 4492 errx(EX_DATAERR, 4493 "logamount must be positive"); 4494 c->max_log = l; 4495 av++; 4496 } else { 4497 len = sizeof(c->max_log); 4498 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 4499 &c->max_log, &len, NULL, 0) == -1) { 4500 if (g_co.test_only) { 4501 c->max_log = 0; 4502 break; 4503 } 4504 errx(1, "sysctlbyname(\"%s\")", 4505 "net.inet.ip.fw.verbose_limit"); 4506 } 4507 } 4508 } 4509 break; 4510 4511 #ifndef NO_ALTQ 4512 case TOK_ALTQ: 4513 { 4514 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 4515 4516 NEED1("missing altq queue name"); 4517 if (have_altq) 4518 errx(EX_DATAERR, 4519 "altq cannot be specified more than once"); 4520 have_altq = (ipfw_insn *)a; 4521 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 4522 CHECK_CMDLEN; 4523 cmd->opcode = O_ALTQ; 4524 a->qid = altq_name_to_qid(*av); 4525 av++; 4526 } 4527 break; 4528 #endif 4529 4530 case TOK_TAG: 4531 case TOK_UNTAG: { 4532 uint16_t tag; 4533 4534 if (have_tag) 4535 errx(EX_USAGE, "tag and untag cannot be " 4536 "specified more than once"); 4537 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 4538 rule_action_params); 4539 have_tag = cmd; 4540 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 4541 av++; 4542 break; 4543 } 4544 4545 default: 4546 abort(); 4547 } 4548 cmd = next_cmd(cmd, &cblen); 4549 } 4550 4551 if (have_state) { /* must be a check-state, we are done */ 4552 if (*av != NULL && 4553 match_token(rule_options, *av) == TOK_COMMENT) { 4554 /* check-state has a comment */ 4555 av++; 4556 fill_comment(cmd, av, cblen); 4557 cmd = next_cmd(cmd, &cblen); 4558 av[0] = NULL; 4559 } 4560 goto done; 4561 } 4562 4563 #define OR_START(target) \ 4564 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 4565 if (open_par) \ 4566 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 4567 prev = NULL; \ 4568 open_par = 1; \ 4569 if ( (av[0])[1] == '\0') { \ 4570 av++; \ 4571 } else \ 4572 (*av)++; \ 4573 } \ 4574 target: \ 4575 4576 4577 #define CLOSE_PAR \ 4578 if (open_par) { \ 4579 if (av[0] && ( \ 4580 strcmp(*av, ")") == 0 || \ 4581 strcmp(*av, "}") == 0)) { \ 4582 prev = NULL; \ 4583 open_par = 0; \ 4584 av++; \ 4585 } else \ 4586 errx(EX_USAGE, "missing \")\"\n"); \ 4587 } 4588 4589 #define NOT_BLOCK \ 4590 if (av[0] && _substrcmp(*av, "not") == 0) { \ 4591 if (cmd->len & F_NOT) \ 4592 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 4593 cmd->len |= F_NOT; \ 4594 av++; \ 4595 } 4596 4597 #define OR_BLOCK(target) \ 4598 if (av[0] && _substrcmp(*av, "or") == 0) { \ 4599 if (prev == NULL || open_par == 0) \ 4600 errx(EX_DATAERR, "invalid OR block"); \ 4601 prev->len |= F_OR; \ 4602 av++; \ 4603 goto target; \ 4604 } \ 4605 CLOSE_PAR; 4606 4607 first_cmd = cmd; 4608 4609 #if 0 4610 /* 4611 * MAC addresses, optional. 4612 * If we have this, we skip the part "proto from src to dst" 4613 * and jump straight to the option parsing. 4614 */ 4615 NOT_BLOCK; 4616 NEED1("missing protocol"); 4617 if (_substrcmp(*av, "MAC") == 0 || 4618 _substrcmp(*av, "mac") == 0) { 4619 av++; /* the "MAC" keyword */ 4620 add_mac(cmd, av); /* exits in case of errors */ 4621 cmd = next_cmd(cmd); 4622 av += 2; /* dst-mac and src-mac */ 4623 NOT_BLOCK; 4624 NEED1("missing mac type"); 4625 if (add_mactype(cmd, av[0])) 4626 cmd = next_cmd(cmd); 4627 av++; /* any or mac-type */ 4628 goto read_options; 4629 } 4630 #endif 4631 4632 /* 4633 * protocol, mandatory 4634 */ 4635 OR_START(get_proto); 4636 NOT_BLOCK; 4637 NEED1("missing protocol"); 4638 if (add_proto_compat(cmd, *av, &proto)) { 4639 av++; 4640 if (F_LEN(cmd) != 0) { 4641 prev = cmd; 4642 cmd = next_cmd(cmd, &cblen); 4643 } 4644 } else if (first_cmd != cmd) { 4645 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 4646 } else { 4647 rule->flags |= IPFW_RULE_JUSTOPTS; 4648 goto read_options; 4649 } 4650 OR_BLOCK(get_proto); 4651 4652 first_cmd = cmd; /* update pointer to use in compact form */ 4653 4654 /* 4655 * "from", mandatory 4656 */ 4657 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 4658 errx(EX_USAGE, "missing ``from''"); 4659 av++; 4660 4661 /* 4662 * source IP, mandatory 4663 */ 4664 OR_START(source_ip); 4665 NOT_BLOCK; /* optional "not" */ 4666 NEED1("missing source address"); 4667 if (add_src(cmd, *av, proto, cblen, tstate)) { 4668 av++; 4669 if (F_LEN(cmd) != 0) { /* ! any */ 4670 prev = cmd; 4671 cmd = next_cmd(cmd, &cblen); 4672 } 4673 } else 4674 errx(EX_USAGE, "bad source address %s", *av); 4675 OR_BLOCK(source_ip); 4676 4677 /* 4678 * source ports, optional 4679 */ 4680 NOT_BLOCK; /* optional "not" */ 4681 if ( av[0] != NULL ) { 4682 if (_substrcmp(*av, "any") == 0 || 4683 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4684 av++; 4685 if (F_LEN(cmd) != 0) 4686 cmd = next_cmd(cmd, &cblen); 4687 } 4688 } 4689 4690 /* 4691 * "to", mandatory 4692 */ 4693 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4694 errx(EX_USAGE, "missing ``to''"); 4695 av++; 4696 4697 /* 4698 * destination, mandatory 4699 */ 4700 OR_START(dest_ip); 4701 NOT_BLOCK; /* optional "not" */ 4702 NEED1("missing dst address"); 4703 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4704 av++; 4705 if (F_LEN(cmd) != 0) { /* ! any */ 4706 prev = cmd; 4707 cmd = next_cmd(cmd, &cblen); 4708 } 4709 } else 4710 errx( EX_USAGE, "bad destination address %s", *av); 4711 OR_BLOCK(dest_ip); 4712 4713 /* 4714 * dest. ports, optional 4715 */ 4716 NOT_BLOCK; /* optional "not" */ 4717 if (av[0]) { 4718 if (_substrcmp(*av, "any") == 0 || 4719 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4720 av++; 4721 if (F_LEN(cmd) != 0) 4722 cmd = next_cmd(cmd, &cblen); 4723 } 4724 } 4725 if (first_cmd == cmd) 4726 rule->flags |= IPFW_RULE_NOOPT; 4727 4728 read_options: 4729 prev = NULL; 4730 while ( av[0] != NULL ) { 4731 char *s; 4732 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4733 4734 s = *av; 4735 cmd32 = (ipfw_insn_u32 *)cmd; 4736 4737 if (*s == '!') { /* alternate syntax for NOT */ 4738 if (cmd->len & F_NOT) 4739 errx(EX_USAGE, "double \"not\" not allowed\n"); 4740 cmd->len = F_NOT; 4741 s++; 4742 } 4743 i = match_token(rule_options, s); 4744 av++; 4745 switch(i) { 4746 case TOK_NOT: 4747 if (cmd->len & F_NOT) 4748 errx(EX_USAGE, "double \"not\" not allowed\n"); 4749 cmd->len = F_NOT; 4750 break; 4751 4752 case TOK_OR: 4753 if (open_par == 0 || prev == NULL) 4754 errx(EX_USAGE, "invalid \"or\" block\n"); 4755 prev->len |= F_OR; 4756 break; 4757 4758 case TOK_STARTBRACE: 4759 if (open_par) 4760 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4761 open_par = 1; 4762 break; 4763 4764 case TOK_ENDBRACE: 4765 if (!open_par) 4766 errx(EX_USAGE, "+missing \")\"\n"); 4767 open_par = 0; 4768 prev = NULL; 4769 break; 4770 4771 case TOK_IN: 4772 fill_cmd(cmd, O_IN, 0, 0); 4773 break; 4774 4775 case TOK_OUT: 4776 cmd->len ^= F_NOT; /* toggle F_NOT */ 4777 fill_cmd(cmd, O_IN, 0, 0); 4778 break; 4779 4780 case TOK_DIVERTED: 4781 fill_cmd(cmd, O_DIVERTED, 0, 3); 4782 break; 4783 4784 case TOK_DIVERTEDLOOPBACK: 4785 fill_cmd(cmd, O_DIVERTED, 0, 1); 4786 break; 4787 4788 case TOK_DIVERTEDOUTPUT: 4789 fill_cmd(cmd, O_DIVERTED, 0, 2); 4790 break; 4791 4792 case TOK_FRAG: { 4793 uint32_t set = 0, clear = 0; 4794 4795 if (*av != NULL && fill_flags(f_ipoff, *av, NULL, 4796 &set, &clear) == 0) 4797 av++; 4798 else { 4799 /* 4800 * Compatibility: no argument after "frag" 4801 * keyword equals to "frag offset". 4802 */ 4803 set = 0x01; 4804 clear = 0; 4805 } 4806 fill_cmd(cmd, O_FRAG, 0, 4807 (set & 0xff) | ( (clear & 0xff) << 8)); 4808 break; 4809 } 4810 4811 case TOK_LAYER2: 4812 fill_cmd(cmd, O_LAYER2, 0, 0); 4813 break; 4814 4815 case TOK_XMIT: 4816 case TOK_RECV: 4817 case TOK_VIA: 4818 NEED1("recv, xmit, via require interface name" 4819 " or address"); 4820 fill_iface((ipfw_insn_if *)cmd, av[0], cblen, tstate); 4821 av++; 4822 if (F_LEN(cmd) == 0) /* not a valid address */ 4823 break; 4824 if (i == TOK_XMIT) 4825 cmd->opcode = O_XMIT; 4826 else if (i == TOK_RECV) 4827 cmd->opcode = O_RECV; 4828 else if (i == TOK_VIA) 4829 cmd->opcode = O_VIA; 4830 break; 4831 4832 case TOK_ICMPTYPES: 4833 NEED1("icmptypes requires list of types"); 4834 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 4835 av++; 4836 break; 4837 4838 case TOK_ICMP6TYPES: 4839 NEED1("icmptypes requires list of types"); 4840 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 4841 av++; 4842 break; 4843 4844 case TOK_IPTTL: 4845 NEED1("ipttl requires TTL"); 4846 if (strpbrk(*av, "-,")) { 4847 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 4848 errx(EX_DATAERR, "invalid ipttl %s", *av); 4849 } else 4850 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 4851 av++; 4852 break; 4853 4854 case TOK_IPID: 4855 NEED1("ipid requires id"); 4856 if (strpbrk(*av, "-,")) { 4857 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 4858 errx(EX_DATAERR, "invalid ipid %s", *av); 4859 } else 4860 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 4861 av++; 4862 break; 4863 4864 case TOK_IPLEN: 4865 NEED1("iplen requires length"); 4866 if (strpbrk(*av, "-,")) { 4867 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 4868 errx(EX_DATAERR, "invalid ip len %s", *av); 4869 } else 4870 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 4871 av++; 4872 break; 4873 4874 case TOK_IPVER: 4875 NEED1("ipver requires version"); 4876 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 4877 av++; 4878 break; 4879 4880 case TOK_IPPRECEDENCE: 4881 NEED1("ipprecedence requires value"); 4882 fill_cmd(cmd, O_IPPRECEDENCE, 0, 4883 (strtoul(*av, NULL, 0) & 7) << 5); 4884 av++; 4885 break; 4886 4887 case TOK_DSCP: 4888 NEED1("missing DSCP code"); 4889 fill_dscp(cmd, *av, cblen); 4890 av++; 4891 break; 4892 4893 case TOK_IPOPTS: 4894 NEED1("missing argument for ipoptions"); 4895 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 4896 av++; 4897 break; 4898 4899 case TOK_IPTOS: 4900 NEED1("missing argument for iptos"); 4901 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 4902 av++; 4903 break; 4904 4905 case TOK_UID: 4906 NEED1("uid requires argument"); 4907 { 4908 char *end; 4909 uid_t uid; 4910 struct passwd *pwd; 4911 4912 cmd->opcode = O_UID; 4913 uid = strtoul(*av, &end, 0); 4914 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 4915 if (pwd == NULL) 4916 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 4917 cmd32->d[0] = pwd->pw_uid; 4918 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4919 av++; 4920 } 4921 break; 4922 4923 case TOK_GID: 4924 NEED1("gid requires argument"); 4925 { 4926 char *end; 4927 gid_t gid; 4928 struct group *grp; 4929 4930 cmd->opcode = O_GID; 4931 gid = strtoul(*av, &end, 0); 4932 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 4933 if (grp == NULL) 4934 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 4935 cmd32->d[0] = grp->gr_gid; 4936 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4937 av++; 4938 } 4939 break; 4940 4941 case TOK_JAIL: 4942 NEED1("jail requires argument"); 4943 { 4944 char *end; 4945 int jid; 4946 4947 cmd->opcode = O_JAIL; 4948 /* 4949 * If av is a number, then we'll just pass it as-is. If 4950 * it's a name, try to resolve that to a jid. 4951 * 4952 * We save the jail_getid(3) call for a fallback because 4953 * it entails an unconditional trip to the kernel to 4954 * either validate a jid or resolve a name to a jid. 4955 * This specific token doesn't currently require a 4956 * jid to be an active jail, so we save a transition 4957 * by simply using a number that we're given. 4958 */ 4959 jid = strtoul(*av, &end, 10); 4960 if (*end != '\0') { 4961 jid = jail_getid(*av); 4962 if (jid < 0) 4963 errx(EX_DATAERR, "%s", jail_errmsg); 4964 } 4965 cmd32->d[0] = (uint32_t)jid; 4966 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4967 av++; 4968 } 4969 break; 4970 4971 case TOK_ESTAB: 4972 fill_cmd(cmd, O_ESTAB, 0, 0); 4973 break; 4974 4975 case TOK_SETUP: 4976 fill_cmd(cmd, O_TCPFLAGS, 0, 4977 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 4978 break; 4979 4980 case TOK_TCPDATALEN: 4981 NEED1("tcpdatalen requires length"); 4982 if (strpbrk(*av, "-,")) { 4983 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 4984 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 4985 } else 4986 fill_cmd(cmd, O_TCPDATALEN, 0, 4987 strtoul(*av, NULL, 0)); 4988 av++; 4989 break; 4990 4991 case TOK_TCPOPTS: 4992 NEED1("missing argument for tcpoptions"); 4993 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 4994 av++; 4995 break; 4996 4997 case TOK_TCPSEQ: 4998 case TOK_TCPACK: 4999 NEED1("tcpseq/tcpack requires argument"); 5000 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 5001 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 5002 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 5003 av++; 5004 break; 5005 5006 case TOK_TCPMSS: 5007 case TOK_TCPWIN: 5008 NEED1("tcpmss/tcpwin requires size"); 5009 if (strpbrk(*av, "-,")) { 5010 if (add_ports(cmd, *av, 0, 5011 i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS, 5012 cblen) == NULL) 5013 errx(EX_DATAERR, "invalid %s size %s", 5014 s, *av); 5015 } else 5016 fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN : 5017 O_TCPMSS, 0, strtoul(*av, NULL, 0)); 5018 av++; 5019 break; 5020 5021 case TOK_TCPFLAGS: 5022 NEED1("missing argument for tcpflags"); 5023 cmd->opcode = O_TCPFLAGS; 5024 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 5025 av++; 5026 break; 5027 5028 case TOK_KEEPSTATE: 5029 case TOK_RECORDSTATE: { 5030 uint16_t uidx; 5031 5032 if (open_par) 5033 errx(EX_USAGE, "keep-state or record-state cannot be part " 5034 "of an or block"); 5035 if (have_state) 5036 errx(EX_USAGE, "only one of keep-state, record-state, " 5037 " limit and set-limit is allowed"); 5038 if (*av != NULL && *av[0] == ':') { 5039 if (state_check_name(*av + 1) != 0) 5040 errx(EX_DATAERR, 5041 "Invalid state name %s", *av); 5042 uidx = pack_object(tstate, *av + 1, 5043 IPFW_TLV_STATE_NAME); 5044 av++; 5045 } else 5046 uidx = pack_object(tstate, default_state_name, 5047 IPFW_TLV_STATE_NAME); 5048 have_state = cmd; 5049 have_rstate = i == TOK_RECORDSTATE; 5050 fill_cmd(cmd, O_KEEP_STATE, 0, uidx); 5051 break; 5052 } 5053 5054 case TOK_LIMIT: 5055 case TOK_SETLIMIT: { 5056 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 5057 int val; 5058 5059 if (open_par) 5060 errx(EX_USAGE, 5061 "limit or set-limit cannot be part of an or block"); 5062 if (have_state) 5063 errx(EX_USAGE, "only one of keep-state, record-state, " 5064 " limit and set-limit is allowed"); 5065 have_state = cmd; 5066 have_rstate = i == TOK_SETLIMIT; 5067 5068 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 5069 CHECK_CMDLEN; 5070 cmd->opcode = O_LIMIT; 5071 c->limit_mask = c->conn_limit = 0; 5072 5073 while ( av[0] != NULL ) { 5074 if ((val = match_token(limit_masks, *av)) <= 0) 5075 break; 5076 c->limit_mask |= val; 5077 av++; 5078 } 5079 5080 if (c->limit_mask == 0) 5081 errx(EX_USAGE, "limit: missing limit mask"); 5082 5083 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 5084 TOK_LIMIT, rule_options); 5085 av++; 5086 5087 if (*av != NULL && *av[0] == ':') { 5088 if (state_check_name(*av + 1) != 0) 5089 errx(EX_DATAERR, 5090 "Invalid state name %s", *av); 5091 cmd->arg1 = pack_object(tstate, *av + 1, 5092 IPFW_TLV_STATE_NAME); 5093 av++; 5094 } else 5095 cmd->arg1 = pack_object(tstate, 5096 default_state_name, IPFW_TLV_STATE_NAME); 5097 break; 5098 } 5099 5100 case TOK_PROTO: 5101 NEED1("missing protocol"); 5102 if (add_proto(cmd, *av, &proto)) { 5103 av++; 5104 } else 5105 errx(EX_DATAERR, "invalid protocol ``%s''", 5106 *av); 5107 break; 5108 5109 case TOK_SRCIP: 5110 NEED1("missing source IP"); 5111 if (add_srcip(cmd, *av, cblen, tstate)) { 5112 av++; 5113 } 5114 break; 5115 5116 case TOK_DSTIP: 5117 NEED1("missing destination IP"); 5118 if (add_dstip(cmd, *av, cblen, tstate)) { 5119 av++; 5120 } 5121 break; 5122 5123 case TOK_SRCIP6: 5124 NEED1("missing source IP6"); 5125 if (add_srcip6(cmd, *av, cblen, tstate)) { 5126 av++; 5127 } 5128 break; 5129 5130 case TOK_DSTIP6: 5131 NEED1("missing destination IP6"); 5132 if (add_dstip6(cmd, *av, cblen, tstate)) { 5133 av++; 5134 } 5135 break; 5136 5137 5138 case TOK_SRCMAC: 5139 NEED1("missing source MAC"); 5140 if (add_srcmac(cmd, *av, tstate)) { 5141 av++; 5142 } 5143 break; 5144 5145 case TOK_DSTMAC: 5146 NEED1("missing destination MAC"); 5147 if (add_dstmac(cmd, *av, tstate)) { 5148 av++; 5149 } 5150 break; 5151 5152 case TOK_SRCPORT: 5153 NEED1("missing source port"); 5154 if (_substrcmp(*av, "any") == 0 || 5155 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 5156 av++; 5157 } else 5158 errx(EX_DATAERR, "invalid source port %s", *av); 5159 break; 5160 5161 case TOK_DSTPORT: 5162 NEED1("missing destination port"); 5163 if (_substrcmp(*av, "any") == 0 || 5164 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 5165 av++; 5166 } else 5167 errx(EX_DATAERR, "invalid destination port %s", 5168 *av); 5169 break; 5170 5171 case TOK_MAC: 5172 if (add_mac(cmd, av, cblen)) 5173 av += 2; 5174 break; 5175 5176 case TOK_MACTYPE: 5177 NEED1("missing mac type"); 5178 if (!add_mactype(cmd, *av, cblen)) 5179 errx(EX_DATAERR, "invalid mac type %s", *av); 5180 av++; 5181 break; 5182 5183 case TOK_VERREVPATH: 5184 fill_cmd(cmd, O_VERREVPATH, 0, 0); 5185 break; 5186 5187 case TOK_VERSRCREACH: 5188 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 5189 break; 5190 5191 case TOK_ANTISPOOF: 5192 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 5193 break; 5194 5195 case TOK_IPSEC: 5196 fill_cmd(cmd, O_IPSEC, 0, 0); 5197 break; 5198 5199 case TOK_IPV6: 5200 fill_cmd(cmd, O_IP6, 0, 0); 5201 break; 5202 5203 case TOK_IPV4: 5204 fill_cmd(cmd, O_IP4, 0, 0); 5205 break; 5206 5207 case TOK_EXT6HDR: 5208 NEED1("missing extension header"); 5209 fill_ext6hdr( cmd, *av ); 5210 av++; 5211 break; 5212 5213 case TOK_FLOWID: 5214 if (proto != IPPROTO_IPV6 ) 5215 errx( EX_USAGE, "flow-id filter is active " 5216 "only for ipv6 protocol\n"); 5217 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 5218 av++; 5219 break; 5220 5221 case TOK_COMMENT: 5222 fill_comment(cmd, av, cblen); 5223 av[0]=NULL; 5224 break; 5225 5226 case TOK_TAGGED: 5227 if (av[0] && strpbrk(*av, "-,")) { 5228 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 5229 errx(EX_DATAERR, "tagged: invalid tag" 5230 " list: %s", *av); 5231 } 5232 else { 5233 uint16_t tag; 5234 5235 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 5236 TOK_TAGGED, rule_options); 5237 fill_cmd(cmd, O_TAGGED, 0, tag); 5238 } 5239 av++; 5240 break; 5241 5242 case TOK_FIB: 5243 NEED1("fib requires fib number"); 5244 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 5245 av++; 5246 break; 5247 case TOK_SOCKARG: 5248 fill_cmd(cmd, O_SOCKARG, 0, 0); 5249 break; 5250 5251 case TOK_LOOKUP: { 5252 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 5253 5254 if (!av[0] || !av[1]) 5255 errx(EX_USAGE, "format: lookup argument tablenum"); 5256 cmd->opcode = O_IP_DST_LOOKUP; 5257 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 5258 i = match_token(lookup_keys, *av); 5259 if (i == -1) 5260 errx(EX_USAGE, "format: cannot lookup on %s", *av); 5261 __PAST_END(c->d, 1) = i; 5262 av++; 5263 5264 if ((i = pack_table(tstate, *av)) == 0) 5265 errx(EX_DATAERR, "Invalid table name: %s", *av); 5266 5267 cmd->arg1 = i; 5268 av++; 5269 } 5270 break; 5271 case TOK_FLOW: 5272 NEED1("missing table name"); 5273 if (strncmp(*av, "table(", 6) != 0) 5274 errx(EX_DATAERR, 5275 "enclose table name into \"table()\""); 5276 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 5277 av++; 5278 break; 5279 5280 case TOK_SKIPACTION: 5281 if (have_skipcmd) 5282 errx(EX_USAGE, "only one defer-action " 5283 "is allowed"); 5284 have_skipcmd = cmd; 5285 fill_cmd(cmd, O_SKIP_ACTION, 0, 0); 5286 break; 5287 5288 case TOK_MARK: 5289 NEED1("missing mark value:mask"); 5290 fill_mark(cmd, *av, cblen); 5291 av++; 5292 break; 5293 5294 default: 5295 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 5296 } 5297 if (F_LEN(cmd) > 0) { /* prepare to advance */ 5298 prev = cmd; 5299 cmd = next_cmd(cmd, &cblen); 5300 } 5301 } 5302 5303 done: 5304 5305 if (!have_state && have_skipcmd) 5306 warnx("Rule contains \"defer-immediate-action\" " 5307 "and doesn't contain any state-related options."); 5308 5309 /* 5310 * Now copy stuff into the rule. 5311 * If we have a keep-state option, the first instruction 5312 * must be a PROBE_STATE (which is generated here). 5313 * If we have a LOG option, it was stored as the first command, 5314 * and now must be moved to the top of the action part. 5315 */ 5316 dst = (ipfw_insn *)rule->cmd; 5317 5318 /* 5319 * First thing to write into the command stream is the match probability. 5320 */ 5321 if (match_prob != 1) { /* 1 means always match */ 5322 dst->opcode = O_PROB; 5323 dst->len = 2; 5324 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 5325 dst += dst->len; 5326 } 5327 5328 /* 5329 * generate O_PROBE_STATE if necessary 5330 */ 5331 if (have_state && have_state->opcode != O_CHECK_STATE && !have_rstate) { 5332 fill_cmd(dst, O_PROBE_STATE, 0, have_state->arg1); 5333 dst = next_cmd(dst, &rblen); 5334 } 5335 5336 /* 5337 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG, 5338 * O_SKIP_ACTION 5339 */ 5340 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 5341 i = F_LEN(src); 5342 CHECK_RBUFLEN(i); 5343 5344 switch (src->opcode) { 5345 case O_LOG: 5346 case O_KEEP_STATE: 5347 case O_LIMIT: 5348 case O_ALTQ: 5349 case O_TAG: 5350 case O_SKIP_ACTION: 5351 break; 5352 default: 5353 bcopy(src, dst, i * sizeof(uint32_t)); 5354 dst += i; 5355 } 5356 } 5357 5358 /* 5359 * put back the have_state command as last opcode 5360 */ 5361 if (have_state && have_state->opcode != O_CHECK_STATE) { 5362 i = F_LEN(have_state); 5363 CHECK_RBUFLEN(i); 5364 bcopy(have_state, dst, i * sizeof(uint32_t)); 5365 dst += i; 5366 } 5367 5368 /* 5369 * put back the have_skipcmd command as very last opcode 5370 */ 5371 if (have_skipcmd) { 5372 i = F_LEN(have_skipcmd); 5373 CHECK_RBUFLEN(i); 5374 bcopy(have_skipcmd, dst, i * sizeof(uint32_t)); 5375 dst += i; 5376 } 5377 5378 /* 5379 * start action section 5380 */ 5381 rule->act_ofs = dst - rule->cmd; 5382 5383 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 5384 if (have_log) { 5385 i = F_LEN(have_log); 5386 CHECK_RBUFLEN(i); 5387 bcopy(have_log, dst, i * sizeof(uint32_t)); 5388 dst += i; 5389 } 5390 if (have_altq) { 5391 i = F_LEN(have_altq); 5392 CHECK_RBUFLEN(i); 5393 bcopy(have_altq, dst, i * sizeof(uint32_t)); 5394 dst += i; 5395 } 5396 if (have_tag) { 5397 i = F_LEN(have_tag); 5398 CHECK_RBUFLEN(i); 5399 bcopy(have_tag, dst, i * sizeof(uint32_t)); 5400 dst += i; 5401 } 5402 5403 /* 5404 * copy all other actions 5405 */ 5406 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 5407 i = F_LEN(src); 5408 CHECK_RBUFLEN(i); 5409 bcopy(src, dst, i * sizeof(uint32_t)); 5410 dst += i; 5411 } 5412 5413 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 5414 *rbufsize = (char *)dst - (char *)rule; 5415 } 5416 5417 static int 5418 compare_ntlv(const void *_a, const void *_b) 5419 { 5420 const ipfw_obj_ntlv *a, *b; 5421 5422 a = (const ipfw_obj_ntlv *)_a; 5423 b = (const ipfw_obj_ntlv *)_b; 5424 5425 if (a->set < b->set) 5426 return (-1); 5427 else if (a->set > b->set) 5428 return (1); 5429 5430 if (a->idx < b->idx) 5431 return (-1); 5432 else if (a->idx > b->idx) 5433 return (1); 5434 5435 if (a->head.type < b->head.type) 5436 return (-1); 5437 else if (a->head.type > b->head.type) 5438 return (1); 5439 5440 return (0); 5441 } 5442 5443 /* 5444 * Provide kernel with sorted list of referenced objects 5445 */ 5446 static void 5447 object_sort_ctlv(ipfw_obj_ctlv *ctlv) 5448 { 5449 5450 qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv); 5451 } 5452 5453 struct object_kt { 5454 uint16_t uidx; 5455 uint16_t type; 5456 }; 5457 static int 5458 compare_object_kntlv(const void *k, const void *v) 5459 { 5460 const ipfw_obj_ntlv *ntlv; 5461 struct object_kt key; 5462 5463 key = *((const struct object_kt *)k); 5464 ntlv = (const ipfw_obj_ntlv *)v; 5465 5466 if (key.uidx < ntlv->idx) 5467 return (-1); 5468 else if (key.uidx > ntlv->idx) 5469 return (1); 5470 5471 if (key.type < ntlv->head.type) 5472 return (-1); 5473 else if (key.type > ntlv->head.type) 5474 return (1); 5475 5476 return (0); 5477 } 5478 5479 /* 5480 * Finds object name in @ctlv by @idx and @type. 5481 * Uses the following facts: 5482 * 1) All TLVs are the same size 5483 * 2) Kernel implementation provides already sorted list. 5484 * 5485 * Returns table name or NULL. 5486 */ 5487 static char * 5488 object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, uint16_t type) 5489 { 5490 ipfw_obj_ntlv *ntlv; 5491 struct object_kt key; 5492 5493 key.uidx = idx; 5494 key.type = type; 5495 5496 ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize, 5497 compare_object_kntlv); 5498 5499 if (ntlv != NULL) 5500 return (ntlv->name); 5501 5502 return (NULL); 5503 } 5504 5505 static char * 5506 table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx) 5507 { 5508 5509 return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME)); 5510 } 5511 5512 /* 5513 * Adds one or more rules to ipfw chain. 5514 * Data layout: 5515 * Request: 5516 * [ 5517 * ip_fw3_opheader 5518 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 5519 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 5520 * ] 5521 * Reply: 5522 * [ 5523 * ip_fw3_opheader 5524 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 5525 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 5526 * ] 5527 * 5528 * Rules in reply are modified to store their actual ruleset number. 5529 * 5530 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 5531 * according to their idx field and there has to be no duplicates. 5532 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 5533 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 5534 */ 5535 void 5536 ipfw_add(char *av[]) 5537 { 5538 uint32_t rulebuf[1024]; 5539 int rbufsize, default_off, tlen, rlen; 5540 size_t sz; 5541 struct tidx ts; 5542 struct ip_fw_rule *rule; 5543 caddr_t tbuf; 5544 ip_fw3_opheader *op3; 5545 ipfw_obj_ctlv *ctlv, *tstate; 5546 5547 rbufsize = sizeof(rulebuf); 5548 memset(rulebuf, 0, rbufsize); 5549 memset(&ts, 0, sizeof(ts)); 5550 5551 /* Optimize case with no tables */ 5552 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 5553 op3 = (ip_fw3_opheader *)rulebuf; 5554 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5555 rule = (struct ip_fw_rule *)(ctlv + 1); 5556 rbufsize -= default_off; 5557 5558 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 5559 /* Align rule size to u64 boundary */ 5560 rlen = roundup2(rbufsize, sizeof(uint64_t)); 5561 5562 tbuf = NULL; 5563 sz = 0; 5564 tstate = NULL; 5565 if (ts.count != 0) { 5566 /* Some tables. We have to alloc more data */ 5567 tlen = ts.count * sizeof(ipfw_obj_ntlv); 5568 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 5569 5570 if ((tbuf = calloc(1, sz)) == NULL) 5571 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 5572 op3 = (ip_fw3_opheader *)tbuf; 5573 /* Tables first */ 5574 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5575 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 5576 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 5577 ctlv->count = ts.count; 5578 ctlv->objsize = sizeof(ipfw_obj_ntlv); 5579 memcpy(ctlv + 1, ts.idx, tlen); 5580 object_sort_ctlv(ctlv); 5581 tstate = ctlv; 5582 /* Rule next */ 5583 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 5584 ctlv->head.type = IPFW_TLV_RULE_LIST; 5585 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5586 ctlv->count = 1; 5587 memcpy(ctlv + 1, rule, rbufsize); 5588 } else { 5589 /* Simply add header */ 5590 sz = rlen + default_off; 5591 memset(ctlv, 0, sizeof(*ctlv)); 5592 ctlv->head.type = IPFW_TLV_RULE_LIST; 5593 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5594 ctlv->count = 1; 5595 } 5596 5597 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 5598 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 5599 5600 if (!g_co.do_quiet) { 5601 struct format_opts sfo; 5602 struct buf_pr bp; 5603 memset(&sfo, 0, sizeof(sfo)); 5604 sfo.tstate = tstate; 5605 sfo.set_mask = (uint32_t)(-1); 5606 bp_alloc(&bp, 4096); 5607 show_static_rule(&g_co, &sfo, &bp, rule, NULL); 5608 printf("%s", bp.buf); 5609 bp_free(&bp); 5610 } 5611 5612 if (tbuf != NULL) 5613 free(tbuf); 5614 5615 if (ts.idx != NULL) 5616 free(ts.idx); 5617 } 5618 5619 /* 5620 * clear the counters or the log counters. 5621 * optname has the following values: 5622 * 0 (zero both counters and logging) 5623 * 1 (zero logging only) 5624 */ 5625 void 5626 ipfw_zero(int ac, char *av[], int optname) 5627 { 5628 ipfw_range_tlv rt; 5629 char const *errstr; 5630 char const *name = optname ? "RESETLOG" : "ZERO"; 5631 uint32_t arg; 5632 int failed = EX_OK; 5633 5634 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 5635 av++; ac--; 5636 5637 if (ac == 0) { 5638 /* clear all entries */ 5639 memset(&rt, 0, sizeof(rt)); 5640 rt.flags = IPFW_RCFLAG_ALL; 5641 if (do_range_cmd(optname, &rt) < 0) 5642 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 5643 if (!g_co.do_quiet) 5644 printf("%s.\n", optname == IP_FW_XZERO ? 5645 "Accounting cleared":"Logging counts reset"); 5646 5647 return; 5648 } 5649 5650 while (ac) { 5651 /* Rule number */ 5652 if (isdigit(**av)) { 5653 arg = strtonum(*av, 0, 0xffff, &errstr); 5654 if (errstr) 5655 errx(EX_DATAERR, 5656 "invalid rule number %s\n", *av); 5657 memset(&rt, 0, sizeof(rt)); 5658 rt.start_rule = arg; 5659 rt.end_rule = arg; 5660 rt.flags |= IPFW_RCFLAG_RANGE; 5661 if (g_co.use_set != 0) { 5662 rt.set = g_co.use_set - 1; 5663 rt.flags |= IPFW_RCFLAG_SET; 5664 } 5665 if (do_range_cmd(optname, &rt) != 0) { 5666 warn("rule %u: setsockopt(IP_FW_X%s)", 5667 arg, name); 5668 failed = EX_UNAVAILABLE; 5669 } else if (rt.new_set == 0) { 5670 printf("Entry %d not found\n", arg); 5671 failed = EX_UNAVAILABLE; 5672 } else if (!g_co.do_quiet) 5673 printf("Entry %d %s.\n", arg, 5674 optname == IP_FW_XZERO ? 5675 "cleared" : "logging count reset"); 5676 } else { 5677 errx(EX_USAGE, "invalid rule number ``%s''", *av); 5678 } 5679 av++; ac--; 5680 } 5681 if (failed != EX_OK) 5682 exit(failed); 5683 } 5684 5685 void 5686 ipfw_flush(int force) 5687 { 5688 ipfw_range_tlv rt; 5689 5690 if (!force && !g_co.do_quiet) { /* need to ask user */ 5691 int c; 5692 5693 printf("Are you sure? [yn] "); 5694 fflush(stdout); 5695 do { 5696 c = toupper(getc(stdin)); 5697 while (c != '\n' && getc(stdin) != '\n') 5698 if (feof(stdin)) 5699 return; /* and do not flush */ 5700 } while (c != 'Y' && c != 'N'); 5701 printf("\n"); 5702 if (c == 'N') /* user said no */ 5703 return; 5704 } 5705 if (g_co.do_pipe) { 5706 dummynet_flush(); 5707 return; 5708 } 5709 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 5710 memset(&rt, 0, sizeof(rt)); 5711 if (g_co.use_set != 0) { 5712 rt.set = g_co.use_set - 1; 5713 rt.flags = IPFW_RCFLAG_SET; 5714 } else 5715 rt.flags = IPFW_RCFLAG_ALL; 5716 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 5717 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 5718 if (!g_co.do_quiet) 5719 printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules"); 5720 } 5721 5722 static struct _s_x intcmds[] = { 5723 { "talist", TOK_TALIST }, 5724 { "iflist", TOK_IFLIST }, 5725 { "olist", TOK_OLIST }, 5726 { "vlist", TOK_VLIST }, 5727 { NULL, 0 } 5728 }; 5729 5730 static struct _s_x otypes[] = { 5731 { "EACTION", IPFW_TLV_EACTION }, 5732 { "DYNSTATE", IPFW_TLV_STATE_NAME }, 5733 { NULL, 0 } 5734 }; 5735 5736 static const char* 5737 lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type) 5738 { 5739 const char *name; 5740 int i; 5741 5742 name = NULL; 5743 for (i = 0; i < cnt; i++) { 5744 if (ntlv[i].head.type != IPFW_TLV_EACTION) 5745 continue; 5746 if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type) 5747 continue; 5748 name = ntlv[i].name; 5749 break; 5750 } 5751 return (name); 5752 } 5753 5754 static void 5755 ipfw_list_objects(int ac __unused, char *av[] __unused) 5756 { 5757 ipfw_obj_lheader req, *olh; 5758 ipfw_obj_ntlv *ntlv; 5759 const char *name; 5760 size_t sz; 5761 uint32_t i; 5762 5763 memset(&req, 0, sizeof(req)); 5764 sz = sizeof(req); 5765 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0) 5766 if (errno != ENOMEM) 5767 return; 5768 5769 sz = req.size; 5770 if ((olh = calloc(1, sz)) == NULL) 5771 return; 5772 5773 olh->size = sz; 5774 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) { 5775 free(olh); 5776 return; 5777 } 5778 5779 if (olh->count > 0) 5780 printf("Objects list:\n"); 5781 else 5782 printf("There are no objects\n"); 5783 ntlv = (ipfw_obj_ntlv *)(olh + 1); 5784 for (i = 0; i < olh->count; i++) { 5785 name = match_value(otypes, ntlv->head.type); 5786 if (name == NULL) 5787 name = lookup_eaction_name( 5788 (ipfw_obj_ntlv *)(olh + 1), olh->count, 5789 ntlv->head.type); 5790 if (name == NULL) 5791 printf(" kidx: %4d\ttype: %10d\tname: %s\n", 5792 ntlv->idx, ntlv->head.type, ntlv->name); 5793 else 5794 printf(" kidx: %4d\ttype: %10s\tname: %s\n", 5795 ntlv->idx, name, ntlv->name); 5796 ntlv++; 5797 } 5798 free(olh); 5799 } 5800 5801 void 5802 ipfw_internal_handler(int ac, char *av[]) 5803 { 5804 int tcmd; 5805 5806 ac--; av++; 5807 NEED1("internal cmd required"); 5808 5809 if ((tcmd = match_token(intcmds, *av)) == -1) 5810 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 5811 5812 switch (tcmd) { 5813 case TOK_IFLIST: 5814 ipfw_list_tifaces(); 5815 break; 5816 case TOK_TALIST: 5817 ipfw_list_ta(ac, av); 5818 break; 5819 case TOK_OLIST: 5820 ipfw_list_objects(ac, av); 5821 break; 5822 case TOK_VLIST: 5823 ipfw_list_values(ac, av); 5824 break; 5825 } 5826 } 5827 5828 static int 5829 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 5830 { 5831 ipfw_obj_lheader req, *olh; 5832 size_t sz; 5833 5834 memset(&req, 0, sizeof(req)); 5835 sz = sizeof(req); 5836 5837 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 5838 if (errno != ENOMEM) 5839 return (errno); 5840 } 5841 5842 sz = req.size; 5843 if ((olh = calloc(1, sz)) == NULL) 5844 return (ENOMEM); 5845 5846 olh->size = sz; 5847 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 5848 free(olh); 5849 return (errno); 5850 } 5851 5852 *polh = olh; 5853 return (0); 5854 } 5855 5856 static int 5857 ifinfo_cmp(const void *a, const void *b) 5858 { 5859 const ipfw_iface_info *ia, *ib; 5860 5861 ia = (const ipfw_iface_info *)a; 5862 ib = (const ipfw_iface_info *)b; 5863 5864 return (stringnum_cmp(ia->ifname, ib->ifname)); 5865 } 5866 5867 /* 5868 * Retrieves table list from kernel, 5869 * optionally sorts it and calls requested function for each table. 5870 * Returns 0 on success. 5871 */ 5872 static void 5873 ipfw_list_tifaces(void) 5874 { 5875 ipfw_obj_lheader *olh = NULL; 5876 ipfw_iface_info *info; 5877 uint32_t i; 5878 int error; 5879 5880 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 5881 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 5882 5883 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 5884 5885 info = (ipfw_iface_info *)(olh + 1); 5886 for (i = 0; i < olh->count; i++) { 5887 if (info->flags & IPFW_IFFLAG_RESOLVED) 5888 printf("%s ifindex: %d refcount: %u changes: %u\n", 5889 info->ifname, info->ifindex, info->refcnt, 5890 info->gencnt); 5891 else 5892 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 5893 info->ifname, info->refcnt, info->gencnt); 5894 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 5895 } 5896 5897 free(olh); 5898 } 5899