1 /*- 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/types.h> 24 #include <sys/param.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/sysctl.h> 28 29 #include "ipfw2.h" 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <grp.h> 35 #include <jail.h> 36 #include <netdb.h> 37 #include <pwd.h> 38 #include <stdio.h> 39 #include <stdarg.h> 40 #include <stdint.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <sysexits.h> 44 #include <time.h> /* ctime */ 45 #include <timeconv.h> /* _long_to_time */ 46 #include <unistd.h> 47 #include <fcntl.h> 48 #include <stddef.h> /* offsetof */ 49 50 #include <net/ethernet.h> 51 #include <net/if.h> /* only IFNAMSIZ */ 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> /* only n_short, n_long */ 54 #include <netinet/ip.h> 55 #include <netinet/ip_icmp.h> 56 #include <netinet/ip_fw.h> 57 #include <netinet/tcp.h> 58 #include <arpa/inet.h> 59 60 struct cmdline_opts g_co; /* global options */ 61 62 struct format_opts { 63 int bcwidth; 64 int pcwidth; 65 int show_counters; 66 int show_time; /* show timestamp */ 67 uint32_t set_mask; /* enabled sets mask */ 68 uint32_t flags; /* request flags */ 69 uint32_t first; /* first rule to request */ 70 uint32_t last; /* last rule to request */ 71 uint32_t dcnt; /* number of dynamic states */ 72 ipfw_obj_ctlv *tstate; /* table state data */ 73 }; 74 75 int resvd_set_number = RESVD_SET; 76 77 static int ipfw_socket = -1; 78 79 #define CHECK_LENGTH(v, len) do { \ 80 if ((v) < (len)) \ 81 errx(EX_DATAERR, "Rule too long"); \ 82 } while (0) 83 /* 84 * Check if we have enough space in cmd buffer. Note that since 85 * first 8? u32 words are reserved by reserved header, full cmd 86 * buffer can't be used, so we need to protect from buffer overrun 87 * only. At the beginning, cblen is less than actual buffer size by 88 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need 89 * for checking small instructions fitting in given range. 90 * We also (ab)use the fact that ipfw_insn is always the first field 91 * for any custom instruction. 92 */ 93 #define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) 94 95 #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ 96 if (!av[0]) \ 97 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ 98 if (_substrcmp(*av, "tablearg") == 0) { \ 99 arg = IP_FW_TARG; \ 100 break; \ 101 } \ 102 \ 103 { \ 104 long _xval; \ 105 char *end; \ 106 \ 107 _xval = strtol(*av, &end, 10); \ 108 \ 109 if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ 110 errx(EX_DATAERR, "%s: invalid argument: %s", \ 111 match_value(s_x, tok), *av); \ 112 \ 113 if (errno == ERANGE || _xval < min || _xval > max) \ 114 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ 115 match_value(s_x, tok), min, max, *av); \ 116 \ 117 if (_xval == IP_FW_TARG) \ 118 errx(EX_DATAERR, "%s: illegal argument value: %s", \ 119 match_value(s_x, tok), *av); \ 120 arg = _xval; \ 121 } \ 122 } while (0) 123 124 static struct _s_x f_tcpflags[] = { 125 { "syn", TH_SYN }, 126 { "fin", TH_FIN }, 127 { "ack", TH_ACK }, 128 { "psh", TH_PUSH }, 129 { "rst", TH_RST }, 130 { "urg", TH_URG }, 131 { "tcp flag", 0 }, 132 { NULL, 0 } 133 }; 134 135 static struct _s_x f_tcpopts[] = { 136 { "mss", IP_FW_TCPOPT_MSS }, 137 { "maxseg", IP_FW_TCPOPT_MSS }, 138 { "window", IP_FW_TCPOPT_WINDOW }, 139 { "sack", IP_FW_TCPOPT_SACK }, 140 { "ts", IP_FW_TCPOPT_TS }, 141 { "timestamp", IP_FW_TCPOPT_TS }, 142 { "cc", IP_FW_TCPOPT_CC }, 143 { "tcp option", 0 }, 144 { NULL, 0 } 145 }; 146 147 /* 148 * IP options span the range 0 to 255 so we need to remap them 149 * (though in fact only the low 5 bits are significant). 150 */ 151 static struct _s_x f_ipopts[] = { 152 { "ssrr", IP_FW_IPOPT_SSRR}, 153 { "lsrr", IP_FW_IPOPT_LSRR}, 154 { "rr", IP_FW_IPOPT_RR}, 155 { "ts", IP_FW_IPOPT_TS}, 156 { "ip option", 0 }, 157 { NULL, 0 } 158 }; 159 160 static struct _s_x f_iptos[] = { 161 { "lowdelay", IPTOS_LOWDELAY}, 162 { "throughput", IPTOS_THROUGHPUT}, 163 { "reliability", IPTOS_RELIABILITY}, 164 { "mincost", IPTOS_MINCOST}, 165 { "congestion", IPTOS_ECN_CE}, 166 { "ecntransport", IPTOS_ECN_ECT0}, 167 { "ip tos option", 0}, 168 { NULL, 0 } 169 }; 170 171 static struct _s_x f_ipoff[] = { 172 { "rf", IP_RF >> 8 }, 173 { "df", IP_DF >> 8 }, 174 { "mf", IP_MF >> 8 }, 175 { "offset", 0x1 }, 176 { NULL, 0} 177 }; 178 179 struct _s_x f_ipdscp[] = { 180 { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ 181 { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ 182 { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ 183 { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ 184 { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ 185 { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ 186 { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ 187 { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ 188 { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ 189 { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ 190 { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ 191 { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ 192 { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 193 { "va", IPTOS_DSCP_VA >> 2 }, /* 101100 */ 194 { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ 195 { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ 196 { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ 197 { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ 198 { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ 199 { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ 200 { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ 201 { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ 202 { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ 203 { NULL, 0 } 204 }; 205 206 static struct _s_x limit_masks[] = { 207 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 208 {"src-addr", DYN_SRC_ADDR}, 209 {"src-port", DYN_SRC_PORT}, 210 {"dst-addr", DYN_DST_ADDR}, 211 {"dst-port", DYN_DST_PORT}, 212 {NULL, 0} 213 }; 214 215 /* 216 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 217 * This is only used in this code. 218 */ 219 #define IPPROTO_ETHERTYPE 0x1000 220 static struct _s_x ether_types[] = { 221 /* 222 * Note, we cannot use "-:&/" in the names because they are field 223 * separators in the type specifications. Also, we use s = NULL as 224 * end-delimiter, because a type of 0 can be legal. 225 */ 226 { "ip", 0x0800 }, 227 { "ipv4", 0x0800 }, 228 { "ipv6", 0x86dd }, 229 { "arp", 0x0806 }, 230 { "rarp", 0x8035 }, 231 { "vlan", 0x8100 }, 232 { "loop", 0x9000 }, 233 { "trail", 0x1000 }, 234 { "at", 0x809b }, 235 { "atalk", 0x809b }, 236 { "aarp", 0x80f3 }, 237 { "pppoe_disc", 0x8863 }, 238 { "pppoe_sess", 0x8864 }, 239 { "ipx_8022", 0x00E0 }, 240 { "ipx_8023", 0x0000 }, 241 { "ipx_ii", 0x8137 }, 242 { "ipx_snap", 0x8137 }, 243 { "ipx", 0x8137 }, 244 { "ns", 0x0600 }, 245 { NULL, 0 } 246 }; 247 248 static struct _s_x rule_eactions[] = { 249 { "nat64clat", TOK_NAT64CLAT }, 250 { "nat64lsn", TOK_NAT64LSN }, 251 { "nat64stl", TOK_NAT64STL }, 252 { "nptv6", TOK_NPTV6 }, 253 { "tcp-setmss", TOK_TCPSETMSS }, 254 { NULL, 0 } /* terminator */ 255 }; 256 257 static struct _s_x rule_actions[] = { 258 { "abort6", TOK_ABORT6 }, 259 { "abort", TOK_ABORT }, 260 { "accept", TOK_ACCEPT }, 261 { "pass", TOK_ACCEPT }, 262 { "allow", TOK_ACCEPT }, 263 { "permit", TOK_ACCEPT }, 264 { "count", TOK_COUNT }, 265 { "pipe", TOK_PIPE }, 266 { "queue", TOK_QUEUE }, 267 { "divert", TOK_DIVERT }, 268 { "tee", TOK_TEE }, 269 { "netgraph", TOK_NETGRAPH }, 270 { "ngtee", TOK_NGTEE }, 271 { "fwd", TOK_FORWARD }, 272 { "forward", TOK_FORWARD }, 273 { "skipto", TOK_SKIPTO }, 274 { "deny", TOK_DENY }, 275 { "drop", TOK_DENY }, 276 { "reject", TOK_REJECT }, 277 { "reset6", TOK_RESET6 }, 278 { "reset", TOK_RESET }, 279 { "unreach6", TOK_UNREACH6 }, 280 { "unreach", TOK_UNREACH }, 281 { "check-state", TOK_CHECKSTATE }, 282 { "//", TOK_COMMENT }, 283 { "nat", TOK_NAT }, 284 { "reass", TOK_REASS }, 285 { "setfib", TOK_SETFIB }, 286 { "setdscp", TOK_SETDSCP }, 287 { "call", TOK_CALL }, 288 { "return", TOK_RETURN }, 289 { "eaction", TOK_EACTION }, 290 { "tcp-setmss", TOK_TCPSETMSS }, 291 { NULL, 0 } /* terminator */ 292 }; 293 294 static struct _s_x rule_action_params[] = { 295 { "altq", TOK_ALTQ }, 296 { "log", TOK_LOG }, 297 { "tag", TOK_TAG }, 298 { "untag", TOK_UNTAG }, 299 { NULL, 0 } /* terminator */ 300 }; 301 302 /* 303 * The 'lookup' instruction accepts one of the following arguments. 304 * Arguments are passed as v[1] in O_DST_LOOKUP options. 305 */ 306 static struct _s_x lookup_keys[] = { 307 { "dst-ip", LOOKUP_DST_IP }, 308 { "src-ip", LOOKUP_SRC_IP }, 309 { "dst-port", LOOKUP_DST_PORT }, 310 { "src-port", LOOKUP_SRC_PORT }, 311 { "dst-mac", LOOKUP_DST_MAC }, 312 { "src-mac", LOOKUP_SRC_MAC }, 313 { "uid", LOOKUP_UID }, 314 { "jail", LOOKUP_JAIL }, 315 { "dscp", LOOKUP_DSCP }, 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 { "defer-action", TOK_SKIPACTION }, 395 { "defer-immediate-action", TOK_SKIPACTION }, 396 { "//", TOK_COMMENT }, 397 398 { "not", TOK_NOT }, /* pseudo option */ 399 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 400 { "or", TOK_OR }, /* pseudo option */ 401 { "|", /* escape */ TOK_OR }, /* pseudo option */ 402 { "{", TOK_STARTBRACE }, /* pseudo option */ 403 { "(", TOK_STARTBRACE }, /* pseudo option */ 404 { "}", TOK_ENDBRACE }, /* pseudo option */ 405 { ")", TOK_ENDBRACE }, /* pseudo option */ 406 { NULL, 0 } /* terminator */ 407 }; 408 409 void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); 410 static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 411 ipfw_cfg_lheader **pcfg, size_t *psize); 412 static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 413 ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); 414 static void ipfw_list_tifaces(void); 415 416 struct tidx; 417 static uint16_t pack_object(struct tidx *tstate, const char *name, int otype); 418 static uint16_t pack_table(struct tidx *tstate, const char *name); 419 420 static char *table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx); 421 static void object_sort_ctlv(ipfw_obj_ctlv *ctlv); 422 static char *object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, 423 uint16_t type); 424 425 int 426 is_ipfw(void) 427 { 428 return (g_co.prog == cmdline_prog_ipfw); 429 } 430 431 /* 432 * Simple string buffer API. 433 * Used to simplify buffer passing between function and for 434 * transparent overrun handling. 435 */ 436 437 /* 438 * Allocates new buffer of given size @sz. 439 * 440 * Returns 0 on success. 441 */ 442 int 443 bp_alloc(struct buf_pr *b, size_t size) 444 { 445 memset(b, 0, sizeof(struct buf_pr)); 446 447 if ((b->buf = calloc(1, size)) == NULL) 448 return (ENOMEM); 449 450 b->ptr = b->buf; 451 b->size = size; 452 b->avail = b->size; 453 454 return (0); 455 } 456 457 void 458 bp_free(struct buf_pr *b) 459 { 460 461 free(b->buf); 462 } 463 464 /* 465 * Flushes buffer so new writer start from beginning. 466 */ 467 void 468 bp_flush(struct buf_pr *b) 469 { 470 471 b->ptr = b->buf; 472 b->avail = b->size; 473 b->buf[0] = '\0'; 474 } 475 476 /* 477 * Print message specified by @format and args. 478 * Automatically manage buffer space and transparently handle 479 * buffer overruns. 480 * 481 * Returns number of bytes that should have been printed. 482 */ 483 int 484 bprintf(struct buf_pr *b, const char *format, ...) 485 { 486 va_list args; 487 int i; 488 489 va_start(args, format); 490 491 i = vsnprintf(b->ptr, b->avail, format, args); 492 va_end(args); 493 494 if (i < 0 || (size_t)i > b->avail) { 495 /* Overflow or print error */ 496 b->avail = 0; 497 } else { 498 b->ptr += i; 499 b->avail -= i; 500 } 501 502 b->needed += i; 503 504 return (i); 505 } 506 507 /* 508 * Special values printer for tablearg-aware opcodes. 509 */ 510 void 511 bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) 512 { 513 514 if (str != NULL) 515 bprintf(bp, "%s", str); 516 if (arg == IP_FW_TARG) 517 bprintf(bp, "tablearg"); 518 else 519 bprintf(bp, "%u", arg); 520 } 521 522 /* 523 * Helper routine to print a possibly unaligned uint64_t on 524 * various platform. If width > 0, print the value with 525 * the desired width, followed by a space; 526 * otherwise, return the required width. 527 */ 528 int 529 pr_u64(struct buf_pr *b, void *pd, int width) 530 { 531 #ifdef TCC 532 #define U64_FMT "I64" 533 #else 534 #define U64_FMT "llu" 535 #endif 536 uint64_t u; 537 unsigned long long d; 538 539 bcopy (pd, &u, sizeof(u)); 540 d = u; 541 return (width > 0) ? 542 bprintf(b, "%*" U64_FMT " ", width, d) : 543 snprintf(NULL, 0, "%" U64_FMT, d) ; 544 #undef U64_FMT 545 } 546 547 548 void * 549 safe_calloc(size_t number, size_t size) 550 { 551 void *ret = calloc(number, size); 552 553 if (ret == NULL) 554 err(EX_OSERR, "calloc"); 555 return ret; 556 } 557 558 void * 559 safe_realloc(void *ptr, size_t size) 560 { 561 void *ret = realloc(ptr, size); 562 563 if (ret == NULL) 564 err(EX_OSERR, "realloc"); 565 return ret; 566 } 567 568 /* 569 * Compare things like interface or table names. 570 */ 571 int 572 stringnum_cmp(const char *a, const char *b) 573 { 574 int la, lb; 575 576 la = strlen(a); 577 lb = strlen(b); 578 579 if (la > lb) 580 return (1); 581 else if (la < lb) 582 return (-01); 583 584 return (strcmp(a, b)); 585 } 586 587 588 /* 589 * conditionally runs the command. 590 * Selected options or negative -> getsockopt 591 */ 592 int 593 do_cmd(int optname, void *optval, uintptr_t optlen) 594 { 595 int i; 596 597 if (g_co.test_only) 598 return 0; 599 600 if (ipfw_socket == -1) 601 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 602 if (ipfw_socket < 0) 603 err(EX_UNAVAILABLE, "socket"); 604 605 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 606 optname == IP_FW_ADD || optname == IP_FW3 || 607 optname == IP_FW_NAT_GET_CONFIG || 608 optname < 0 || 609 optname == IP_FW_NAT_GET_LOG) { 610 if (optname < 0) 611 optname = -optname; 612 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 613 (socklen_t *)optlen); 614 } else { 615 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 616 } 617 return i; 618 } 619 620 /* 621 * do_set3 - pass ipfw control cmd to kernel 622 * @optname: option name 623 * @optval: pointer to option data 624 * @optlen: option length 625 * 626 * Assumes op3 header is already embedded. 627 * Calls setsockopt() with IP_FW3 as kernel-visible opcode. 628 * Returns 0 on success or errno otherwise. 629 */ 630 int 631 do_set3(int optname, ip_fw3_opheader *op3, size_t optlen) 632 { 633 634 if (g_co.test_only) 635 return (0); 636 637 if (ipfw_socket == -1) 638 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 639 if (ipfw_socket < 0) 640 err(EX_UNAVAILABLE, "socket"); 641 642 op3->opcode = optname; 643 644 return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen)); 645 } 646 647 /* 648 * do_get3 - pass ipfw control cmd to kernel 649 * @optname: option name 650 * @optval: pointer to option data 651 * @optlen: pointer to option length 652 * 653 * Assumes op3 header is already embedded. 654 * Calls getsockopt() with IP_FW3 as kernel-visible opcode. 655 * Returns 0 on success or errno otherwise. 656 */ 657 int 658 do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) 659 { 660 int error; 661 socklen_t len; 662 663 if (g_co.test_only) 664 return (0); 665 666 if (ipfw_socket == -1) 667 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 668 if (ipfw_socket < 0) 669 err(EX_UNAVAILABLE, "socket"); 670 671 op3->opcode = optname; 672 673 len = *optlen; 674 error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, &len); 675 *optlen = len; 676 677 return (error); 678 } 679 680 /** 681 * match_token takes a table and a string, returns the value associated 682 * with the string (-1 in case of failure). 683 */ 684 int 685 match_token(struct _s_x *table, const char *string) 686 { 687 struct _s_x *pt; 688 uint i = strlen(string); 689 690 for (pt = table ; i && pt->s != NULL ; pt++) 691 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 692 return pt->x; 693 return (-1); 694 } 695 696 /** 697 * match_token_relaxed takes a table and a string, returns the value associated 698 * with the string for the best match. 699 * 700 * Returns: 701 * value from @table for matched records 702 * -1 for non-matched records 703 * -2 if more than one records match @string. 704 */ 705 int 706 match_token_relaxed(struct _s_x *table, const char *string) 707 { 708 struct _s_x *pt, *m; 709 int i, c; 710 711 i = strlen(string); 712 c = 0; 713 714 for (pt = table ; i != 0 && pt->s != NULL ; pt++) { 715 if (strncmp(pt->s, string, i) != 0) 716 continue; 717 m = pt; 718 c++; 719 } 720 721 if (c == 1) 722 return (m->x); 723 724 return (c > 0 ? -2: -1); 725 } 726 727 int 728 get_token(struct _s_x *table, const char *string, const char *errbase) 729 { 730 int tcmd; 731 732 if ((tcmd = match_token_relaxed(table, string)) < 0) 733 errx(EX_USAGE, "%s %s %s", 734 (tcmd == 0) ? "invalid" : "ambiguous", errbase, string); 735 736 return (tcmd); 737 } 738 739 /** 740 * match_value takes a table and a value, returns the string associated 741 * with the value (NULL in case of failure). 742 */ 743 char const * 744 match_value(struct _s_x *p, int value) 745 { 746 for (; p->s != NULL; p++) 747 if (p->x == value) 748 return p->s; 749 return NULL; 750 } 751 752 size_t 753 concat_tokens(char *buf, size_t bufsize, struct _s_x *table, 754 const char *delimiter) 755 { 756 struct _s_x *pt; 757 int l; 758 size_t sz; 759 760 for (sz = 0, pt = table ; pt->s != NULL; pt++) { 761 l = snprintf(buf + sz, bufsize - sz, "%s%s", 762 (sz == 0) ? "" : delimiter, pt->s); 763 sz += l; 764 bufsize += l; 765 if (sz > bufsize) 766 return (bufsize); 767 } 768 769 return (sz); 770 } 771 772 /* 773 * helper function to process a set of flags and set bits in the 774 * appropriate masks. 775 */ 776 int 777 fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set, 778 uint32_t *clear) 779 { 780 char *q; /* points to the separator */ 781 int val; 782 uint32_t *which; /* mask we are working on */ 783 784 while (p && *p) { 785 if (*p == '!') { 786 p++; 787 which = clear; 788 } else 789 which = set; 790 q = strchr(p, ','); 791 if (q) 792 *q++ = '\0'; 793 val = match_token(flags, p); 794 if (val <= 0) { 795 if (e != NULL) 796 *e = p; 797 return (-1); 798 } 799 *which |= (uint32_t)val; 800 p = q; 801 } 802 return (0); 803 } 804 805 void 806 print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set) 807 { 808 char const *comma = ""; 809 int i, l; 810 811 for (i = 0; list[i].x != 0; i++) { 812 if ((set & list[i].x) == 0) 813 continue; 814 815 set &= ~list[i].x; 816 l = snprintf(buf, sz, "%s%s", comma, list[i].s); 817 if (l < 0 || (size_t)l >= sz) 818 return; 819 comma = ","; 820 buf += l; 821 sz -=l; 822 } 823 } 824 825 /* 826 * _substrcmp takes two strings and returns 1 if they do not match, 827 * and 0 if they match exactly or the first string is a sub-string 828 * of the second. A warning is printed to stderr in the case that the 829 * first string is a sub-string of the second. 830 * 831 * This function will be removed in the future through the usual 832 * deprecation process. 833 */ 834 int 835 _substrcmp(const char *str1, const char* str2) 836 { 837 838 if (strncmp(str1, str2, strlen(str1)) != 0) 839 return 1; 840 841 if (strlen(str1) != strlen(str2)) 842 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 843 str1, str2); 844 return 0; 845 } 846 847 /* 848 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 849 * and 0 if they match exactly or the second string is a sub-string 850 * of the first. A warning is printed to stderr in the case that the 851 * first string does not match the third. 852 * 853 * This function exists to warn about the bizarre construction 854 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 855 * for "bytes". The problem is that in addition to accepting "by", 856 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 857 * other string beginning with "by". 858 * 859 * This function will be removed in the future through the usual 860 * deprecation process. 861 */ 862 int 863 _substrcmp2(const char *str1, const char* str2, const char* str3) 864 { 865 866 if (strncmp(str1, str2, strlen(str2)) != 0) 867 return 1; 868 869 if (strcmp(str1, str3) != 0) 870 warnx("DEPRECATED: '%s' matched '%s'", 871 str1, str3); 872 return 0; 873 } 874 875 /* 876 * prints one port, symbolic or numeric 877 */ 878 static void 879 print_port(struct buf_pr *bp, int proto, uint16_t port) 880 { 881 882 if (proto == IPPROTO_ETHERTYPE) { 883 char const *s; 884 885 if (g_co.do_resolv && (s = match_value(ether_types, port)) ) 886 bprintf(bp, "%s", s); 887 else 888 bprintf(bp, "0x%04x", port); 889 } else { 890 struct servent *se = NULL; 891 if (g_co.do_resolv) { 892 struct protoent *pe = getprotobynumber(proto); 893 894 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 895 } 896 if (se) 897 bprintf(bp, "%s", se->s_name); 898 else 899 bprintf(bp, "%d", port); 900 } 901 } 902 903 static struct _s_x _port_name[] = { 904 {"dst-port", O_IP_DSTPORT}, 905 {"src-port", O_IP_SRCPORT}, 906 {"ipid", O_IPID}, 907 {"iplen", O_IPLEN}, 908 {"ipttl", O_IPTTL}, 909 {"mac-type", O_MAC_TYPE}, 910 {"tcpdatalen", O_TCPDATALEN}, 911 {"tcpmss", O_TCPMSS}, 912 {"tcpwin", O_TCPWIN}, 913 {"tagged", O_TAGGED}, 914 {NULL, 0} 915 }; 916 917 /* 918 * Print the values in a list 16-bit items of the types above. 919 * XXX todo: add support for mask. 920 */ 921 static void 922 print_newports(struct buf_pr *bp, const ipfw_insn_u16 *cmd, int proto, int opcode) 923 { 924 const uint16_t *p = cmd->ports; 925 int i; 926 char const *sep; 927 928 if (opcode != 0) { 929 sep = match_value(_port_name, opcode); 930 if (sep == NULL) 931 sep = "???"; 932 bprintf(bp, " %s", sep); 933 } 934 sep = " "; 935 for (i = F_LEN((const ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 936 bprintf(bp, "%s", sep); 937 print_port(bp, proto, p[0]); 938 if (p[0] != p[1]) { 939 bprintf(bp, "-"); 940 print_port(bp, proto, p[1]); 941 } 942 sep = ","; 943 } 944 } 945 946 /* 947 * Like strtol, but also translates service names into port numbers 948 * for some protocols. 949 * In particular: 950 * proto == -1 disables the protocol check; 951 * proto == IPPROTO_ETHERTYPE looks up an internal table 952 * proto == <some value in /etc/protocols> matches the values there. 953 * Returns *end == s in case the parameter is not found. 954 */ 955 static int 956 strtoport(char *s, char **end, int base, int proto) 957 { 958 char *p, *buf; 959 char *s1; 960 int i; 961 962 *end = s; /* default - not found */ 963 if (*s == '\0') 964 return 0; /* not found */ 965 966 if (isdigit(*s)) 967 return strtol(s, end, base); 968 969 /* 970 * find separator. '\\' escapes the next char. 971 */ 972 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\' || 973 *s1 == '_' || *s1 == '.') ; s1++) 974 if (*s1 == '\\' && s1[1] != '\0') 975 s1++; 976 977 buf = safe_calloc(s1 - s + 1, 1); 978 979 /* 980 * copy into a buffer skipping backslashes 981 */ 982 for (p = s, i = 0; p != s1 ; p++) 983 if (*p != '\\') 984 buf[i++] = *p; 985 buf[i++] = '\0'; 986 987 if (proto == IPPROTO_ETHERTYPE) { 988 i = match_token(ether_types, buf); 989 free(buf); 990 if (i != -1) { /* found */ 991 *end = s1; 992 return i; 993 } 994 } else { 995 struct protoent *pe = NULL; 996 struct servent *se; 997 998 if (proto != 0) 999 pe = getprotobynumber(proto); 1000 setservent(1); 1001 se = getservbyname(buf, pe ? pe->p_name : NULL); 1002 free(buf); 1003 if (se != NULL) { 1004 *end = s1; 1005 return ntohs(se->s_port); 1006 } 1007 } 1008 return 0; /* not found */ 1009 } 1010 1011 /* 1012 * Fill the body of the command with the list of port ranges. 1013 */ 1014 static int 1015 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 1016 { 1017 uint16_t a, b, *p = cmd->ports; 1018 int i = 0; 1019 char *s = av; 1020 1021 while (*s) { 1022 a = strtoport(av, &s, 0, proto); 1023 if (s == av) /* empty or invalid argument */ 1024 return (0); 1025 1026 CHECK_LENGTH(cblen, i + 2); 1027 1028 switch (*s) { 1029 case '-': /* a range */ 1030 av = s + 1; 1031 b = strtoport(av, &s, 0, proto); 1032 /* Reject expressions like '1-abc' or '1-2-3'. */ 1033 if (s == av || (*s != ',' && *s != '\0')) 1034 return (0); 1035 p[0] = a; 1036 p[1] = b; 1037 break; 1038 case ',': /* comma separated list */ 1039 case '\0': 1040 p[0] = p[1] = a; 1041 break; 1042 default: 1043 warnx("port list: invalid separator <%c> in <%s>", 1044 *s, av); 1045 return (0); 1046 } 1047 1048 i++; 1049 p += 2; 1050 av = s + 1; 1051 } 1052 if (i > 0) { 1053 if (i + 1 > F_LEN_MASK) 1054 errx(EX_DATAERR, "too many ports/ranges\n"); 1055 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 1056 } 1057 return (i); 1058 } 1059 1060 /* 1061 * Fill the body of the command with the list of DiffServ codepoints. 1062 */ 1063 static void 1064 fill_dscp(ipfw_insn *cmd, char *av, int cblen) 1065 { 1066 uint32_t *low, *high; 1067 char *s = av, *a; 1068 int code; 1069 1070 cmd->opcode = O_DSCP; 1071 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1072 1073 CHECK_CMDLEN; 1074 1075 low = (uint32_t *)(cmd + 1); 1076 high = low + 1; 1077 1078 *low = 0; 1079 *high = 0; 1080 1081 while (s != NULL) { 1082 a = strchr(s, ','); 1083 1084 if (a != NULL) 1085 *a++ = '\0'; 1086 1087 if (isalpha(*s)) { 1088 if ((code = match_token(f_ipdscp, s)) == -1) 1089 errx(EX_DATAERR, "Unknown DSCP code"); 1090 } else { 1091 code = strtoul(s, NULL, 10); 1092 if (code < 0 || code > 63) 1093 errx(EX_DATAERR, "Invalid DSCP value"); 1094 } 1095 1096 if (code >= 32) 1097 *high |= 1 << (code - 32); 1098 else 1099 *low |= 1 << code; 1100 1101 s = a; 1102 } 1103 } 1104 1105 static struct _s_x icmpcodes[] = { 1106 { "net", ICMP_UNREACH_NET }, 1107 { "host", ICMP_UNREACH_HOST }, 1108 { "protocol", ICMP_UNREACH_PROTOCOL }, 1109 { "port", ICMP_UNREACH_PORT }, 1110 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 1111 { "srcfail", ICMP_UNREACH_SRCFAIL }, 1112 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 1113 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 1114 { "isolated", ICMP_UNREACH_ISOLATED }, 1115 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 1116 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 1117 { "tosnet", ICMP_UNREACH_TOSNET }, 1118 { "toshost", ICMP_UNREACH_TOSHOST }, 1119 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 1120 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 1121 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 1122 { NULL, 0 } 1123 }; 1124 1125 static void 1126 fill_reject_code(u_short *codep, char *str) 1127 { 1128 int val; 1129 char *s; 1130 1131 val = strtoul(str, &s, 0); 1132 if (s == str || *s != '\0' || val >= 0x100) 1133 val = match_token(icmpcodes, str); 1134 if (val < 0) 1135 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 1136 *codep = val; 1137 return; 1138 } 1139 1140 static void 1141 print_reject_code(struct buf_pr *bp, uint16_t code) 1142 { 1143 char const *s; 1144 1145 if ((s = match_value(icmpcodes, code)) != NULL) 1146 bprintf(bp, "unreach %s", s); 1147 else 1148 bprintf(bp, "unreach %u", code); 1149 } 1150 1151 /* 1152 * Returns the number of bits set (from left) in a contiguous bitmask, 1153 * or -1 if the mask is not contiguous. 1154 * XXX this needs a proper fix. 1155 * This effectively works on masks in big-endian (network) format. 1156 * when compiled on little endian architectures. 1157 * 1158 * First bit is bit 7 of the first byte -- note, for MAC addresses, 1159 * the first bit on the wire is bit 0 of the first byte. 1160 * len is the max length in bits. 1161 */ 1162 int 1163 contigmask(const uint8_t *p, int len) 1164 { 1165 int i, n; 1166 1167 for (i=0; i<len ; i++) 1168 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 1169 break; 1170 for (n=i+1; n < len; n++) 1171 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 1172 return -1; /* mask not contiguous */ 1173 return i; 1174 } 1175 1176 /* 1177 * print flags set/clear in the two bitmasks passed as parameters. 1178 * There is a specialized check for f_tcpflags. 1179 */ 1180 static void 1181 print_flags(struct buf_pr *bp, char const *name, const ipfw_insn *cmd, 1182 struct _s_x *list) 1183 { 1184 char const *comma = ""; 1185 int i; 1186 uint8_t set = cmd->arg1 & 0xff; 1187 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 1188 1189 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 1190 bprintf(bp, " setup"); 1191 return; 1192 } 1193 1194 bprintf(bp, " %s ", name); 1195 for (i=0; list[i].x != 0; i++) { 1196 if (set & list[i].x) { 1197 set &= ~list[i].x; 1198 bprintf(bp, "%s%s", comma, list[i].s); 1199 comma = ","; 1200 } 1201 if (clear & list[i].x) { 1202 clear &= ~list[i].x; 1203 bprintf(bp, "%s!%s", comma, list[i].s); 1204 comma = ","; 1205 } 1206 } 1207 } 1208 1209 1210 /* 1211 * Print the ip address contained in a command. 1212 */ 1213 static void 1214 print_ip(struct buf_pr *bp, const struct format_opts *fo, 1215 const ipfw_insn_ip *cmd) 1216 { 1217 struct hostent *he = NULL; 1218 const struct in_addr *ia; 1219 const uint32_t *a = ((const ipfw_insn_u32 *)cmd)->d; 1220 uint32_t len = F_LEN((const ipfw_insn *)cmd); 1221 char *t; 1222 1223 bprintf(bp, " "); 1224 if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { 1225 const char *arg; 1226 1227 arg = match_value(lookup_keys, a[1]); 1228 t = table_search_ctlv(fo->tstate, 1229 ((const ipfw_insn *)cmd)->arg1); 1230 bprintf(bp, "lookup %s %s", arg, t); 1231 return; 1232 } 1233 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 1234 bprintf(bp, "me"); 1235 return; 1236 } 1237 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 1238 cmd->o.opcode == O_IP_DST_LOOKUP) { 1239 t = table_search_ctlv(fo->tstate, 1240 ((const ipfw_insn *)cmd)->arg1); 1241 bprintf(bp, "table(%s", t); 1242 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1243 bprintf(bp, ",%u", *a); 1244 bprintf(bp, ")"); 1245 return; 1246 } 1247 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 1248 const uint32_t *map = (const uint32_t *)&cmd->mask; 1249 struct in_addr addr; 1250 uint32_t x; 1251 int i, j; 1252 char comma = '{'; 1253 1254 x = cmd->o.arg1 - 1; 1255 x = htonl(~x); 1256 addr.s_addr = htonl(cmd->addr.s_addr); 1257 bprintf(bp, "%s/%d", inet_ntoa(addr), 1258 contigmask((uint8_t *)&x, 32)); 1259 x = cmd->addr.s_addr; 1260 x &= 0xff; /* base */ 1261 /* 1262 * Print bits and ranges. 1263 * Locate first bit set (i), then locate first bit unset (j). 1264 * If we have 3+ consecutive bits set, then print them as a 1265 * range, otherwise only print the initial bit and rescan. 1266 */ 1267 for (i=0; i < cmd->o.arg1; i++) 1268 if (map[i/32] & (1<<(i & 31))) { 1269 for (j=i+1; j < cmd->o.arg1; j++) 1270 if (!(map[ j/32] & (1<<(j & 31)))) 1271 break; 1272 bprintf(bp, "%c%d", comma, i+x); 1273 if (j>i+2) { /* range has at least 3 elements */ 1274 bprintf(bp, "-%d", j-1+x); 1275 i = j-1; 1276 } 1277 comma = ','; 1278 } 1279 bprintf(bp, "}"); 1280 return; 1281 } 1282 /* 1283 * len == 2 indicates a single IP, whereas lists of 1 or more 1284 * addr/mask pairs have len = (2n+1). We convert len to n so we 1285 * use that to count the number of entries. 1286 */ 1287 for (len = len / 2; len > 0; len--, a += 2) { 1288 int mb = /* mask length */ 1289 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 1290 32 : contigmask((const uint8_t *)&(a[1]), 32); 1291 if (mb == 32 && g_co.do_resolv) 1292 he = gethostbyaddr((const char *)&(a[0]), sizeof(in_addr_t), 1293 AF_INET); 1294 if (he != NULL) /* resolved to name */ 1295 bprintf(bp, "%s", he->h_name); 1296 else if (mb == 0) /* any */ 1297 bprintf(bp, "any"); 1298 else { /* numeric IP followed by some kind of mask */ 1299 ia = (const struct in_addr *)&a[0]; 1300 bprintf(bp, "%s", inet_ntoa(*ia)); 1301 if (mb < 0) { 1302 ia = (const struct in_addr *)&a[1]; 1303 bprintf(bp, ":%s", inet_ntoa(*ia)); 1304 } else if (mb < 32) 1305 bprintf(bp, "/%d", mb); 1306 } 1307 if (len > 1) 1308 bprintf(bp, ","); 1309 } 1310 } 1311 1312 /* 1313 * prints a MAC address/mask pair 1314 */ 1315 static void 1316 format_mac(struct buf_pr *bp, const uint8_t *addr, const uint8_t *mask) 1317 { 1318 int l = contigmask(mask, 48); 1319 1320 if (l == 0) 1321 bprintf(bp, " any"); 1322 else { 1323 bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", 1324 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1325 if (l == -1) 1326 bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", 1327 mask[0], mask[1], mask[2], 1328 mask[3], mask[4], mask[5]); 1329 else if (l < 48) 1330 bprintf(bp, "/%d", l); 1331 } 1332 } 1333 1334 static void 1335 print_mac(struct buf_pr *bp, const ipfw_insn_mac *mac) 1336 { 1337 1338 bprintf(bp, " MAC"); 1339 format_mac(bp, mac->addr, mac->mask); 1340 format_mac(bp, mac->addr + 6, mac->mask + 6); 1341 } 1342 1343 static void 1344 print_mac_lookup(struct buf_pr *bp, const struct format_opts *fo, 1345 const ipfw_insn *cmd) 1346 { 1347 uint32_t len = F_LEN(cmd); 1348 char *t; 1349 1350 bprintf(bp, " "); 1351 1352 t = table_search_ctlv(fo->tstate, cmd->arg1); 1353 bprintf(bp, "table(%s", t); 1354 if (len == F_INSN_SIZE(ipfw_insn_u32)) 1355 bprintf(bp, ",%u", ((const ipfw_insn_u32 *)cmd)->d[0]); 1356 bprintf(bp, ")"); 1357 } 1358 1359 static void 1360 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1361 { 1362 uint8_t type; 1363 1364 cmd->d[0] = 0; 1365 while (*av) { 1366 if (*av == ',') 1367 av++; 1368 1369 type = strtoul(av, &av, 0); 1370 1371 if (*av != ',' && *av != '\0') 1372 errx(EX_DATAERR, "invalid ICMP type"); 1373 1374 if (type > 31) 1375 errx(EX_DATAERR, "ICMP type out of range"); 1376 1377 cmd->d[0] |= 1 << type; 1378 } 1379 cmd->o.opcode = O_ICMPTYPE; 1380 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1381 } 1382 1383 static void 1384 print_icmptypes(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1385 { 1386 int i; 1387 char sep= ' '; 1388 1389 bprintf(bp, " icmptypes"); 1390 for (i = 0; i < 32; i++) { 1391 if ( (cmd->d[0] & (1 << (i))) == 0) 1392 continue; 1393 bprintf(bp, "%c%d", sep, i); 1394 sep = ','; 1395 } 1396 } 1397 1398 static void 1399 print_dscp(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1400 { 1401 const uint32_t *v; 1402 const char *code; 1403 int i = 0; 1404 char sep= ' '; 1405 1406 bprintf(bp, " dscp"); 1407 v = cmd->d; 1408 while (i < 64) { 1409 if (*v & (1 << i)) { 1410 if ((code = match_value(f_ipdscp, i)) != NULL) 1411 bprintf(bp, "%c%s", sep, code); 1412 else 1413 bprintf(bp, "%c%d", sep, i); 1414 sep = ','; 1415 } 1416 1417 if ((++i % 32) == 0) 1418 v++; 1419 } 1420 } 1421 1422 #define insntod(cmd, type) ((const ipfw_insn_ ## type *)(cmd)) 1423 struct show_state { 1424 struct ip_fw_rule *rule; 1425 const ipfw_insn *eaction; 1426 uint8_t *printed; 1427 int flags; 1428 #define HAVE_PROTO 0x0001 1429 #define HAVE_SRCIP 0x0002 1430 #define HAVE_DSTIP 0x0004 1431 #define HAVE_PROBE_STATE 0x0008 1432 int proto; 1433 int or_block; 1434 }; 1435 1436 static int 1437 init_show_state(struct show_state *state, struct ip_fw_rule *rule) 1438 { 1439 1440 state->printed = calloc(rule->cmd_len, sizeof(uint8_t)); 1441 if (state->printed == NULL) 1442 return (ENOMEM); 1443 state->rule = rule; 1444 state->eaction = NULL; 1445 state->flags = 0; 1446 state->proto = 0; 1447 state->or_block = 0; 1448 return (0); 1449 } 1450 1451 static void 1452 free_show_state(struct show_state *state) 1453 { 1454 1455 free(state->printed); 1456 } 1457 1458 static uint8_t 1459 is_printed_opcode(struct show_state *state, const ipfw_insn *cmd) 1460 { 1461 1462 return (state->printed[cmd - state->rule->cmd]); 1463 } 1464 1465 static void 1466 mark_printed(struct show_state *state, const ipfw_insn *cmd) 1467 { 1468 1469 state->printed[cmd - state->rule->cmd] = 1; 1470 } 1471 1472 static void 1473 print_limit_mask(struct buf_pr *bp, const ipfw_insn_limit *limit) 1474 { 1475 struct _s_x *p = limit_masks; 1476 char const *comma = " "; 1477 uint8_t x; 1478 1479 for (x = limit->limit_mask; p->x != 0; p++) { 1480 if ((x & p->x) == p->x) { 1481 x &= ~p->x; 1482 bprintf(bp, "%s%s", comma, p->s); 1483 comma = ","; 1484 } 1485 } 1486 bprint_uint_arg(bp, " ", limit->conn_limit); 1487 } 1488 1489 static int 1490 print_instruction(struct buf_pr *bp, const struct format_opts *fo, 1491 struct show_state *state, const ipfw_insn *cmd) 1492 { 1493 struct protoent *pe; 1494 struct passwd *pwd; 1495 struct group *grp; 1496 const char *s; 1497 double d; 1498 1499 if (is_printed_opcode(state, cmd)) 1500 return (0); 1501 if ((cmd->len & F_OR) != 0 && state->or_block == 0) 1502 bprintf(bp, " {"); 1503 if (cmd->opcode != O_IN && (cmd->len & F_NOT) != 0) 1504 bprintf(bp, " not"); 1505 1506 switch (cmd->opcode) { 1507 case O_PROB: 1508 d = 1.0 * insntod(cmd, u32)->d[0] / 0x7fffffff; 1509 bprintf(bp, "prob %f ", d); 1510 break; 1511 case O_PROBE_STATE: /* no need to print anything here */ 1512 state->flags |= HAVE_PROBE_STATE; 1513 break; 1514 case O_IP_SRC: 1515 case O_IP_SRC_LOOKUP: 1516 case O_IP_SRC_MASK: 1517 case O_IP_SRC_ME: 1518 case O_IP_SRC_SET: 1519 if (state->flags & HAVE_SRCIP) 1520 bprintf(bp, " src-ip"); 1521 print_ip(bp, fo, insntod(cmd, ip)); 1522 break; 1523 case O_IP_DST: 1524 case O_IP_DST_LOOKUP: 1525 case O_IP_DST_MASK: 1526 case O_IP_DST_ME: 1527 case O_IP_DST_SET: 1528 if (state->flags & HAVE_DSTIP) 1529 bprintf(bp, " dst-ip"); 1530 print_ip(bp, fo, insntod(cmd, ip)); 1531 break; 1532 case O_IP6_SRC: 1533 case O_IP6_SRC_MASK: 1534 case O_IP6_SRC_ME: 1535 if (state->flags & HAVE_SRCIP) 1536 bprintf(bp, " src-ip6"); 1537 print_ip6(bp, insntod(cmd, ip6)); 1538 break; 1539 case O_IP6_DST: 1540 case O_IP6_DST_MASK: 1541 case O_IP6_DST_ME: 1542 if (state->flags & HAVE_DSTIP) 1543 bprintf(bp, " dst-ip6"); 1544 print_ip6(bp, insntod(cmd, ip6)); 1545 break; 1546 case O_MAC_SRC_LOOKUP: 1547 bprintf(bp, " src-mac"); 1548 print_mac_lookup(bp, fo, cmd); 1549 break; 1550 case O_MAC_DST_LOOKUP: 1551 bprintf(bp, " dst-mac"); 1552 print_mac_lookup(bp, fo, cmd); 1553 break; 1554 case O_FLOW6ID: 1555 print_flow6id(bp, insntod(cmd, u32)); 1556 break; 1557 case O_IP_DSTPORT: 1558 case O_IP_SRCPORT: 1559 print_newports(bp, insntod(cmd, u16), state->proto, 1560 (state->flags & (HAVE_SRCIP | HAVE_DSTIP)) == 1561 (HAVE_SRCIP | HAVE_DSTIP) ? cmd->opcode: 0); 1562 break; 1563 case O_PROTO: 1564 pe = getprotobynumber(cmd->arg1); 1565 if (state->flags & HAVE_PROTO) 1566 bprintf(bp, " proto"); 1567 if (pe != NULL) 1568 bprintf(bp, " %s", pe->p_name); 1569 else 1570 bprintf(bp, " %u", cmd->arg1); 1571 state->proto = cmd->arg1; 1572 break; 1573 case O_MACADDR2: 1574 print_mac(bp, insntod(cmd, mac)); 1575 break; 1576 case O_MAC_TYPE: 1577 print_newports(bp, insntod(cmd, u16), 1578 IPPROTO_ETHERTYPE, cmd->opcode); 1579 break; 1580 case O_FRAG: 1581 print_flags(bp, "frag", cmd, f_ipoff); 1582 break; 1583 case O_FIB: 1584 bprintf(bp, " fib %u", cmd->arg1); 1585 break; 1586 case O_SOCKARG: 1587 bprintf(bp, " sockarg"); 1588 break; 1589 case O_IN: 1590 bprintf(bp, cmd->len & F_NOT ? " out" : " in"); 1591 break; 1592 case O_DIVERTED: 1593 switch (cmd->arg1) { 1594 case 3: 1595 bprintf(bp, " diverted"); 1596 break; 1597 case 2: 1598 bprintf(bp, " diverted-output"); 1599 break; 1600 case 1: 1601 bprintf(bp, " diverted-loopback"); 1602 break; 1603 default: 1604 bprintf(bp, " diverted-?<%u>", cmd->arg1); 1605 break; 1606 } 1607 break; 1608 case O_LAYER2: 1609 bprintf(bp, " layer2"); 1610 break; 1611 case O_XMIT: 1612 case O_RECV: 1613 case O_VIA: 1614 if (cmd->opcode == O_XMIT) 1615 s = "xmit"; 1616 else if (cmd->opcode == O_RECV) 1617 s = "recv"; 1618 else /* if (cmd->opcode == O_VIA) */ 1619 s = "via"; 1620 switch (insntod(cmd, if)->name[0]) { 1621 case '\0': 1622 bprintf(bp, " %s %s", s, 1623 inet_ntoa(insntod(cmd, if)->p.ip)); 1624 break; 1625 case '\1': 1626 bprintf(bp, " %s table(%s)", s, 1627 table_search_ctlv(fo->tstate, 1628 insntod(cmd, if)->p.kidx)); 1629 break; 1630 default: 1631 bprintf(bp, " %s %s", s, 1632 insntod(cmd, if)->name); 1633 } 1634 break; 1635 case O_IP_FLOW_LOOKUP: 1636 s = table_search_ctlv(fo->tstate, cmd->arg1); 1637 bprintf(bp, " flow table(%s", s); 1638 if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) 1639 bprintf(bp, ",%u", insntod(cmd, u32)->d[0]); 1640 bprintf(bp, ")"); 1641 break; 1642 case O_IPID: 1643 case O_IPTTL: 1644 case O_IPLEN: 1645 case O_TCPDATALEN: 1646 case O_TCPMSS: 1647 case O_TCPWIN: 1648 if (F_LEN(cmd) == 1) { 1649 switch (cmd->opcode) { 1650 case O_IPID: 1651 s = "ipid"; 1652 break; 1653 case O_IPTTL: 1654 s = "ipttl"; 1655 break; 1656 case O_IPLEN: 1657 s = "iplen"; 1658 break; 1659 case O_TCPDATALEN: 1660 s = "tcpdatalen"; 1661 break; 1662 case O_TCPMSS: 1663 s = "tcpmss"; 1664 break; 1665 case O_TCPWIN: 1666 s = "tcpwin"; 1667 break; 1668 default: 1669 s = "<unknown>"; 1670 break; 1671 } 1672 bprintf(bp, " %s %u", s, cmd->arg1); 1673 } else 1674 print_newports(bp, insntod(cmd, u16), 0, 1675 cmd->opcode); 1676 break; 1677 case O_IPVER: 1678 bprintf(bp, " ipver %u", cmd->arg1); 1679 break; 1680 case O_IPPRECEDENCE: 1681 bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); 1682 break; 1683 case O_DSCP: 1684 print_dscp(bp, insntod(cmd, u32)); 1685 break; 1686 case O_IPOPT: 1687 print_flags(bp, "ipoptions", cmd, f_ipopts); 1688 break; 1689 case O_IPTOS: 1690 print_flags(bp, "iptos", cmd, f_iptos); 1691 break; 1692 case O_ICMPTYPE: 1693 print_icmptypes(bp, insntod(cmd, u32)); 1694 break; 1695 case O_ESTAB: 1696 bprintf(bp, " established"); 1697 break; 1698 case O_TCPFLAGS: 1699 print_flags(bp, "tcpflags", cmd, f_tcpflags); 1700 break; 1701 case O_TCPOPTS: 1702 print_flags(bp, "tcpoptions", cmd, f_tcpopts); 1703 break; 1704 case O_TCPACK: 1705 bprintf(bp, " tcpack %d", 1706 ntohl(insntod(cmd, u32)->d[0])); 1707 break; 1708 case O_TCPSEQ: 1709 bprintf(bp, " tcpseq %d", 1710 ntohl(insntod(cmd, u32)->d[0])); 1711 break; 1712 case O_UID: 1713 pwd = getpwuid(insntod(cmd, u32)->d[0]); 1714 if (pwd != NULL) 1715 bprintf(bp, " uid %s", pwd->pw_name); 1716 else 1717 bprintf(bp, " uid %u", 1718 insntod(cmd, u32)->d[0]); 1719 break; 1720 case O_GID: 1721 grp = getgrgid(insntod(cmd, u32)->d[0]); 1722 if (grp != NULL) 1723 bprintf(bp, " gid %s", grp->gr_name); 1724 else 1725 bprintf(bp, " gid %u", 1726 insntod(cmd, u32)->d[0]); 1727 break; 1728 case O_JAIL: 1729 bprintf(bp, " jail %d", insntod(cmd, u32)->d[0]); 1730 break; 1731 case O_VERREVPATH: 1732 bprintf(bp, " verrevpath"); 1733 break; 1734 case O_VERSRCREACH: 1735 bprintf(bp, " versrcreach"); 1736 break; 1737 case O_ANTISPOOF: 1738 bprintf(bp, " antispoof"); 1739 break; 1740 case O_IPSEC: 1741 bprintf(bp, " ipsec"); 1742 break; 1743 case O_NOP: 1744 bprintf(bp, " // %s", (const char *)(cmd + 1)); 1745 break; 1746 case O_KEEP_STATE: 1747 if (state->flags & HAVE_PROBE_STATE) 1748 bprintf(bp, " keep-state"); 1749 else 1750 bprintf(bp, " record-state"); 1751 bprintf(bp, " :%s", 1752 object_search_ctlv(fo->tstate, cmd->arg1, 1753 IPFW_TLV_STATE_NAME)); 1754 break; 1755 case O_LIMIT: 1756 if (state->flags & HAVE_PROBE_STATE) 1757 bprintf(bp, " limit"); 1758 else 1759 bprintf(bp, " set-limit"); 1760 print_limit_mask(bp, insntod(cmd, limit)); 1761 bprintf(bp, " :%s", 1762 object_search_ctlv(fo->tstate, cmd->arg1, 1763 IPFW_TLV_STATE_NAME)); 1764 break; 1765 case O_IP6: 1766 if (state->flags & HAVE_PROTO) 1767 bprintf(bp, " proto"); 1768 bprintf(bp, " ip6"); 1769 break; 1770 case O_IP4: 1771 if (state->flags & HAVE_PROTO) 1772 bprintf(bp, " proto"); 1773 bprintf(bp, " ip4"); 1774 break; 1775 case O_ICMP6TYPE: 1776 print_icmp6types(bp, insntod(cmd, u32)); 1777 break; 1778 case O_EXT_HDR: 1779 print_ext6hdr(bp, cmd); 1780 break; 1781 case O_TAGGED: 1782 if (F_LEN(cmd) == 1) 1783 bprint_uint_arg(bp, " tagged ", cmd->arg1); 1784 else 1785 print_newports(bp, insntod(cmd, u16), 1786 0, O_TAGGED); 1787 break; 1788 case O_SKIP_ACTION: 1789 bprintf(bp, " defer-immediate-action"); 1790 break; 1791 default: 1792 bprintf(bp, " [opcode %d len %d]", cmd->opcode, 1793 cmd->len); 1794 } 1795 if (cmd->len & F_OR) { 1796 bprintf(bp, " or"); 1797 state->or_block = 1; 1798 } else if (state->or_block != 0) { 1799 bprintf(bp, " }"); 1800 state->or_block = 0; 1801 } 1802 mark_printed(state, cmd); 1803 1804 return (1); 1805 } 1806 1807 static ipfw_insn * 1808 print_opcode(struct buf_pr *bp, struct format_opts *fo, 1809 struct show_state *state, int opcode) 1810 { 1811 ipfw_insn *cmd; 1812 int l; 1813 1814 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 1815 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1816 /* We use zero opcode to print the rest of options */ 1817 if (opcode >= 0 && cmd->opcode != opcode) 1818 continue; 1819 /* 1820 * Skip O_NOP, when we printing the rest 1821 * of options, it will be handled separately. 1822 */ 1823 if (cmd->opcode == O_NOP && opcode != O_NOP) 1824 continue; 1825 if (!print_instruction(bp, fo, state, cmd)) 1826 continue; 1827 return (cmd); 1828 } 1829 return (NULL); 1830 } 1831 1832 static void 1833 print_fwd(struct buf_pr *bp, const ipfw_insn *cmd) 1834 { 1835 char buf[INET6_ADDRSTRLEN + IF_NAMESIZE + 2]; 1836 const ipfw_insn_sa6 *sa6; 1837 const ipfw_insn_sa *sa; 1838 uint16_t port; 1839 1840 if (cmd->opcode == O_FORWARD_IP) { 1841 sa = insntod(cmd, sa); 1842 port = sa->sa.sin_port; 1843 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 1844 bprintf(bp, "fwd tablearg"); 1845 else 1846 bprintf(bp, "fwd %s", inet_ntoa(sa->sa.sin_addr)); 1847 } else { 1848 sa6 = insntod(cmd, sa6); 1849 port = sa6->sa.sin6_port; 1850 bprintf(bp, "fwd "); 1851 if (getnameinfo((const struct sockaddr *)&sa6->sa, 1852 sizeof(struct sockaddr_in6), buf, sizeof(buf), NULL, 0, 1853 NI_NUMERICHOST) == 0) 1854 bprintf(bp, "%s", buf); 1855 } 1856 if (port != 0) 1857 bprintf(bp, ",%u", port); 1858 } 1859 1860 static int 1861 print_action_instruction(struct buf_pr *bp, const struct format_opts *fo, 1862 struct show_state *state, const ipfw_insn *cmd) 1863 { 1864 const char *s; 1865 1866 if (is_printed_opcode(state, cmd)) 1867 return (0); 1868 switch (cmd->opcode) { 1869 case O_CHECK_STATE: 1870 bprintf(bp, "check-state"); 1871 if (cmd->arg1 != 0) 1872 s = object_search_ctlv(fo->tstate, cmd->arg1, 1873 IPFW_TLV_STATE_NAME); 1874 else 1875 s = NULL; 1876 bprintf(bp, " :%s", s ? s: "any"); 1877 break; 1878 case O_ACCEPT: 1879 bprintf(bp, "allow"); 1880 break; 1881 case O_COUNT: 1882 bprintf(bp, "count"); 1883 break; 1884 case O_DENY: 1885 bprintf(bp, "deny"); 1886 break; 1887 case O_REJECT: 1888 if (cmd->arg1 == ICMP_REJECT_RST) 1889 bprintf(bp, "reset"); 1890 else if (cmd->arg1 == ICMP_REJECT_ABORT) 1891 bprintf(bp, "abort"); 1892 else if (cmd->arg1 == ICMP_UNREACH_HOST) 1893 bprintf(bp, "reject"); 1894 else if (cmd->arg1 == ICMP_UNREACH_NEEDFRAG && 1895 cmd->len == F_INSN_SIZE(ipfw_insn_u16)) 1896 bprintf(bp, "needfrag %u", 1897 ((const ipfw_insn_u16 *)cmd)->ports[0]); 1898 else 1899 print_reject_code(bp, cmd->arg1); 1900 break; 1901 case O_UNREACH6: 1902 if (cmd->arg1 == ICMP6_UNREACH_RST) 1903 bprintf(bp, "reset6"); 1904 else if (cmd->arg1 == ICMP6_UNREACH_ABORT) 1905 bprintf(bp, "abort6"); 1906 else 1907 print_unreach6_code(bp, cmd->arg1); 1908 break; 1909 case O_SKIPTO: 1910 bprint_uint_arg(bp, "skipto ", cmd->arg1); 1911 break; 1912 case O_PIPE: 1913 bprint_uint_arg(bp, "pipe ", cmd->arg1); 1914 break; 1915 case O_QUEUE: 1916 bprint_uint_arg(bp, "queue ", cmd->arg1); 1917 break; 1918 case O_DIVERT: 1919 bprint_uint_arg(bp, "divert ", cmd->arg1); 1920 break; 1921 case O_TEE: 1922 bprint_uint_arg(bp, "tee ", cmd->arg1); 1923 break; 1924 case O_NETGRAPH: 1925 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 1926 break; 1927 case O_NGTEE: 1928 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 1929 break; 1930 case O_FORWARD_IP: 1931 case O_FORWARD_IP6: 1932 print_fwd(bp, cmd); 1933 break; 1934 case O_LOG: 1935 if (insntod(cmd, log)->max_log > 0) 1936 bprintf(bp, " log logamount %d", 1937 insntod(cmd, log)->max_log); 1938 else 1939 bprintf(bp, " log"); 1940 break; 1941 case O_ALTQ: 1942 #ifndef NO_ALTQ 1943 print_altq_cmd(bp, insntod(cmd, altq)); 1944 #endif 1945 break; 1946 case O_TAG: 1947 bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ": 1948 " tag ", cmd->arg1); 1949 break; 1950 case O_NAT: 1951 if (cmd->arg1 != IP_FW_NAT44_GLOBAL) 1952 bprint_uint_arg(bp, "nat ", cmd->arg1); 1953 else 1954 bprintf(bp, "nat global"); 1955 break; 1956 case O_SETFIB: 1957 if (cmd->arg1 == IP_FW_TARG) 1958 bprint_uint_arg(bp, "setfib ", cmd->arg1); 1959 else 1960 bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF); 1961 break; 1962 case O_EXTERNAL_ACTION: 1963 /* 1964 * The external action can consists of two following 1965 * each other opcodes - O_EXTERNAL_ACTION and 1966 * O_EXTERNAL_INSTANCE. The first contains the ID of 1967 * name of external action. The second contains the ID 1968 * of name of external action instance. 1969 * NOTE: in case when external action has no named 1970 * instances support, the second opcode isn't needed. 1971 */ 1972 state->eaction = cmd; 1973 s = object_search_ctlv(fo->tstate, cmd->arg1, 1974 IPFW_TLV_EACTION); 1975 if (match_token(rule_eactions, s) != -1) 1976 bprintf(bp, "%s", s); 1977 else 1978 bprintf(bp, "eaction %s", s); 1979 break; 1980 case O_EXTERNAL_INSTANCE: 1981 if (state->eaction == NULL) 1982 break; 1983 /* 1984 * XXX: we need to teach ipfw(9) to rewrite opcodes 1985 * in the user buffer on rule addition. When we add 1986 * the rule, we specify zero TLV type for 1987 * O_EXTERNAL_INSTANCE object. To show correct 1988 * rule after `ipfw add` we need to search instance 1989 * name with zero type. But when we do `ipfw show` 1990 * we calculate TLV type using IPFW_TLV_EACTION_NAME() 1991 * macro. 1992 */ 1993 s = object_search_ctlv(fo->tstate, cmd->arg1, 0); 1994 if (s == NULL) 1995 s = object_search_ctlv(fo->tstate, 1996 cmd->arg1, IPFW_TLV_EACTION_NAME( 1997 state->eaction->arg1)); 1998 bprintf(bp, " %s", s); 1999 break; 2000 case O_EXTERNAL_DATA: 2001 if (state->eaction == NULL) 2002 break; 2003 /* 2004 * Currently we support data formatting only for 2005 * external data with datalen u16. For unknown data 2006 * print its size in bytes. 2007 */ 2008 if (cmd->len == F_INSN_SIZE(ipfw_insn)) 2009 bprintf(bp, " %u", cmd->arg1); 2010 else 2011 bprintf(bp, " %ubytes", 2012 cmd->len * sizeof(uint32_t)); 2013 break; 2014 case O_SETDSCP: 2015 if (cmd->arg1 == IP_FW_TARG) { 2016 bprintf(bp, "setdscp tablearg"); 2017 break; 2018 } 2019 s = match_value(f_ipdscp, cmd->arg1 & 0x3F); 2020 if (s != NULL) 2021 bprintf(bp, "setdscp %s", s); 2022 else 2023 bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F); 2024 break; 2025 case O_REASS: 2026 bprintf(bp, "reass"); 2027 break; 2028 case O_CALLRETURN: 2029 if (cmd->len & F_NOT) 2030 bprintf(bp, "return"); 2031 else 2032 bprint_uint_arg(bp, "call ", cmd->arg1); 2033 break; 2034 default: 2035 bprintf(bp, "** unrecognized action %d len %d ", 2036 cmd->opcode, cmd->len); 2037 } 2038 mark_printed(state, cmd); 2039 2040 return (1); 2041 } 2042 2043 2044 static ipfw_insn * 2045 print_action(struct buf_pr *bp, struct format_opts *fo, 2046 struct show_state *state, uint8_t opcode) 2047 { 2048 ipfw_insn *cmd; 2049 int l; 2050 2051 for (l = state->rule->cmd_len - state->rule->act_ofs, 2052 cmd = ACTION_PTR(state->rule); l > 0; 2053 l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2054 if (cmd->opcode != opcode) 2055 continue; 2056 if (!print_action_instruction(bp, fo, state, cmd)) 2057 continue; 2058 return (cmd); 2059 } 2060 return (NULL); 2061 } 2062 2063 static void 2064 print_proto(struct buf_pr *bp, struct format_opts *fo, 2065 struct show_state *state) 2066 { 2067 ipfw_insn *cmd; 2068 int l, proto, ip4, ip6; 2069 2070 /* Count all O_PROTO, O_IP4, O_IP6 instructions. */ 2071 proto = ip4 = ip6 = 0; 2072 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2073 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2074 switch (cmd->opcode) { 2075 case O_PROTO: 2076 proto++; 2077 break; 2078 case O_IP4: 2079 ip4 = 1; 2080 if (cmd->len & F_OR) 2081 ip4++; 2082 break; 2083 case O_IP6: 2084 ip6 = 1; 2085 if (cmd->len & F_OR) 2086 ip6++; 2087 break; 2088 default: 2089 continue; 2090 } 2091 } 2092 if (proto == 0 && ip4 == 0 && ip6 == 0) { 2093 state->proto = IPPROTO_IP; 2094 state->flags |= HAVE_PROTO; 2095 bprintf(bp, " ip"); 2096 return; 2097 } 2098 /* To handle the case { ip4 or ip6 }, print opcode with F_OR first */ 2099 cmd = NULL; 2100 if (ip4 || ip6) 2101 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6); 2102 if (cmd != NULL && (cmd->len & F_OR)) 2103 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4); 2104 if (cmd == NULL || (cmd->len & F_OR)) 2105 for (l = proto; l > 0; l--) { 2106 cmd = print_opcode(bp, fo, state, O_PROTO); 2107 if (cmd == NULL || (cmd->len & F_OR) == 0) 2108 break; 2109 } 2110 /* Initialize proto, it is used by print_newports() */ 2111 state->flags |= HAVE_PROTO; 2112 if (state->proto == 0 && ip6 != 0) 2113 state->proto = IPPROTO_IPV6; 2114 } 2115 2116 static int 2117 match_opcode(int opcode, const int opcodes[], size_t nops) 2118 { 2119 size_t i; 2120 2121 for (i = 0; i < nops; i++) 2122 if (opcode == opcodes[i]) 2123 return (1); 2124 return (0); 2125 } 2126 2127 static void 2128 print_address(struct buf_pr *bp, struct format_opts *fo, 2129 struct show_state *state, const int opcodes[], size_t nops, int portop, 2130 int flag) 2131 { 2132 ipfw_insn *cmd; 2133 int count, l, portcnt, pf; 2134 2135 count = portcnt = 0; 2136 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2137 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2138 if (match_opcode(cmd->opcode, opcodes, nops)) 2139 count++; 2140 else if (cmd->opcode == portop) 2141 portcnt++; 2142 } 2143 if (count == 0) 2144 bprintf(bp, " any"); 2145 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2146 l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2147 if (!match_opcode(cmd->opcode, opcodes, nops)) 2148 continue; 2149 print_instruction(bp, fo, state, cmd); 2150 if ((cmd->len & F_OR) == 0) 2151 break; 2152 count--; 2153 } 2154 /* 2155 * If several O_IP_?PORT opcodes specified, leave them to the 2156 * options section. 2157 */ 2158 if (portcnt == 1) { 2159 for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0; 2160 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2161 if (cmd->opcode != portop) { 2162 pf = (cmd->len & F_OR); 2163 continue; 2164 } 2165 /* Print opcode iff it is not in OR block. */ 2166 if (pf == 0 && (cmd->len & F_OR) == 0) 2167 print_instruction(bp, fo, state, cmd); 2168 break; 2169 } 2170 } 2171 state->flags |= flag; 2172 } 2173 2174 static const int action_opcodes[] = { 2175 O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT, 2176 O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE, 2177 O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT, 2178 O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN, 2179 /* keep the following opcodes at the end of the list */ 2180 O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA 2181 }; 2182 2183 static const int modifier_opcodes[] = { 2184 O_LOG, O_ALTQ, O_TAG 2185 }; 2186 2187 static const int src_opcodes[] = { 2188 O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME, 2189 O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME 2190 }; 2191 2192 static const int dst_opcodes[] = { 2193 O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME, 2194 O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME 2195 }; 2196 2197 static void 2198 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 2199 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 2200 { 2201 static int twidth = 0; 2202 struct show_state state; 2203 ipfw_insn *cmd; 2204 size_t i; 2205 2206 /* Print # DISABLED or skip the rule */ 2207 if ((fo->set_mask & (1 << rule->set)) == 0) { 2208 /* disabled mask */ 2209 if (!co->show_sets) 2210 return; 2211 else 2212 bprintf(bp, "# DISABLED "); 2213 } 2214 if (init_show_state(&state, rule) != 0) { 2215 warn("init_show_state() failed"); 2216 return; 2217 } 2218 bprintf(bp, "%05u ", rule->rulenum); 2219 2220 /* only if counters are available */ 2221 if (cntr != NULL) { 2222 /* Print counters if enabled */ 2223 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2224 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 2225 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 2226 } 2227 2228 /* Print timestamp */ 2229 if (co->do_time == TIMESTAMP_NUMERIC) 2230 bprintf(bp, "%10u ", cntr->timestamp); 2231 else if (co->do_time == TIMESTAMP_STRING) { 2232 char timestr[30]; 2233 time_t t = (time_t)0; 2234 2235 if (twidth == 0) { 2236 strcpy(timestr, ctime(&t)); 2237 *strchr(timestr, '\n') = '\0'; 2238 twidth = strlen(timestr); 2239 } 2240 if (cntr->timestamp > 0) { 2241 t = _long_to_time(cntr->timestamp); 2242 2243 strcpy(timestr, ctime(&t)); 2244 *strchr(timestr, '\n') = '\0'; 2245 bprintf(bp, "%s ", timestr); 2246 } else { 2247 bprintf(bp, "%*s ", twidth, ""); 2248 } 2249 } 2250 } 2251 2252 /* Print set number */ 2253 if (co->show_sets) 2254 bprintf(bp, "set %d ", rule->set); 2255 2256 /* Print the optional "match probability" */ 2257 cmd = print_opcode(bp, fo, &state, O_PROB); 2258 /* Print rule action */ 2259 for (i = 0; i < nitems(action_opcodes); i++) { 2260 cmd = print_action(bp, fo, &state, action_opcodes[i]); 2261 if (cmd == NULL) 2262 continue; 2263 /* Handle special cases */ 2264 switch (cmd->opcode) { 2265 case O_CHECK_STATE: 2266 goto end; 2267 case O_EXTERNAL_ACTION: 2268 case O_EXTERNAL_INSTANCE: 2269 /* External action can have several instructions */ 2270 continue; 2271 } 2272 break; 2273 } 2274 /* Print rule modifiers */ 2275 for (i = 0; i < nitems(modifier_opcodes); i++) 2276 print_action(bp, fo, &state, modifier_opcodes[i]); 2277 /* 2278 * Print rule body 2279 */ 2280 if (co->comment_only != 0) 2281 goto end; 2282 2283 if (rule->flags & IPFW_RULE_JUSTOPTS) { 2284 state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; 2285 goto justopts; 2286 } 2287 2288 print_proto(bp, fo, &state); 2289 if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT)) 2290 goto justopts; 2291 2292 /* Print source */ 2293 bprintf(bp, " from"); 2294 print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes), 2295 O_IP_SRCPORT, HAVE_SRCIP); 2296 2297 /* Print destination */ 2298 bprintf(bp, " to"); 2299 print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes), 2300 O_IP_DSTPORT, HAVE_DSTIP); 2301 2302 justopts: 2303 /* Print the rest of options */ 2304 while (print_opcode(bp, fo, &state, -1)) 2305 ; 2306 end: 2307 /* Print comment at the end */ 2308 cmd = print_opcode(bp, fo, &state, O_NOP); 2309 if (co->comment_only != 0 && cmd == NULL) 2310 bprintf(bp, " // ..."); 2311 bprintf(bp, "\n"); 2312 free_show_state(&state); 2313 } 2314 2315 static void 2316 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2317 struct buf_pr *bp, ipfw_dyn_rule *d) 2318 { 2319 struct protoent *pe; 2320 struct in_addr a; 2321 uint16_t rulenum; 2322 char buf[INET6_ADDRSTRLEN]; 2323 2324 if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT) 2325 return; 2326 2327 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2328 bprintf(bp, "%05d", rulenum); 2329 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2330 bprintf(bp, " "); 2331 pr_u64(bp, &d->pcnt, fo->pcwidth); 2332 pr_u64(bp, &d->bcnt, fo->bcwidth); 2333 bprintf(bp, "(%ds)", d->expire); 2334 } 2335 switch (d->dyn_type) { 2336 case O_LIMIT_PARENT: 2337 bprintf(bp, " PARENT %d", d->count); 2338 break; 2339 case O_LIMIT: 2340 bprintf(bp, " LIMIT"); 2341 break; 2342 case O_KEEP_STATE: /* bidir, no mask */ 2343 bprintf(bp, " STATE"); 2344 break; 2345 } 2346 2347 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2348 bprintf(bp, " %s", pe->p_name); 2349 else 2350 bprintf(bp, " proto %u", d->id.proto); 2351 2352 if (d->id.addr_type == 4) { 2353 a.s_addr = htonl(d->id.src_ip); 2354 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2355 2356 a.s_addr = htonl(d->id.dst_ip); 2357 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2358 } else if (d->id.addr_type == 6) { 2359 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2360 sizeof(buf)), d->id.src_port); 2361 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2362 buf, sizeof(buf)), d->id.dst_port); 2363 } else 2364 bprintf(bp, " UNKNOWN <-> UNKNOWN"); 2365 if (d->kidx != 0) 2366 bprintf(bp, " :%s", object_search_ctlv(fo->tstate, 2367 d->kidx, IPFW_TLV_STATE_NAME)); 2368 2369 #define BOTH_SYN (TH_SYN | (TH_SYN << 8)) 2370 #define BOTH_FIN (TH_FIN | (TH_FIN << 8)) 2371 if (co->verbose) { 2372 bprintf(bp, " state 0x%08x%s", d->state, 2373 d->state ? " ": ","); 2374 if (d->state & IPFW_DYN_ORPHANED) 2375 bprintf(bp, "ORPHANED,"); 2376 if ((d->state & BOTH_SYN) == BOTH_SYN) 2377 bprintf(bp, "BOTH_SYN,"); 2378 else { 2379 if (d->state & TH_SYN) 2380 bprintf(bp, "F_SYN,"); 2381 if (d->state & (TH_SYN << 8)) 2382 bprintf(bp, "R_SYN,"); 2383 } 2384 if ((d->state & BOTH_FIN) == BOTH_FIN) 2385 bprintf(bp, "BOTH_FIN,"); 2386 else { 2387 if (d->state & TH_FIN) 2388 bprintf(bp, "F_FIN,"); 2389 if (d->state & (TH_FIN << 8)) 2390 bprintf(bp, "R_FIN,"); 2391 } 2392 bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd, 2393 d->ack_rev); 2394 } 2395 } 2396 2397 static int 2398 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2399 { 2400 ipfw_range_header rh; 2401 size_t sz; 2402 2403 memset(&rh, 0, sizeof(rh)); 2404 memcpy(&rh.range, rt, sizeof(*rt)); 2405 rh.range.head.length = sizeof(*rt); 2406 rh.range.head.type = IPFW_TLV_RANGE; 2407 sz = sizeof(rh); 2408 2409 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2410 return (-1); 2411 /* Save number of matched objects */ 2412 rt->new_set = rh.range.new_set; 2413 return (0); 2414 } 2415 2416 /* 2417 * This one handles all set-related commands 2418 * ipfw set { show | enable | disable } 2419 * ipfw set swap X Y 2420 * ipfw set move X to Y 2421 * ipfw set move rule X to Y 2422 */ 2423 void 2424 ipfw_sets_handler(char *av[]) 2425 { 2426 ipfw_range_tlv rt; 2427 const char *msg; 2428 size_t size; 2429 uint32_t masks[2]; 2430 int i; 2431 uint16_t rulenum; 2432 uint8_t cmd; 2433 2434 av++; 2435 memset(&rt, 0, sizeof(rt)); 2436 2437 if (av[0] == NULL) 2438 errx(EX_USAGE, "set needs command"); 2439 if (_substrcmp(*av, "show") == 0) { 2440 struct format_opts fo; 2441 ipfw_cfg_lheader *cfg; 2442 2443 memset(&fo, 0, sizeof(fo)); 2444 if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0) 2445 err(EX_OSERR, "requesting config failed"); 2446 2447 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2448 if ((cfg->set_mask & (1<<i)) == 0) { 2449 printf("%s %d", msg, i); 2450 msg = ""; 2451 } 2452 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2453 for (i = 0; i < RESVD_SET; i++) 2454 if ((cfg->set_mask & (1<<i)) != 0) { 2455 printf("%s %d", msg, i); 2456 msg = ""; 2457 } 2458 printf("\n"); 2459 free(cfg); 2460 } else if (_substrcmp(*av, "swap") == 0) { 2461 av++; 2462 if ( av[0] == NULL || av[1] == NULL ) 2463 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2464 rt.set = atoi(av[0]); 2465 rt.new_set = atoi(av[1]); 2466 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2467 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2468 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2469 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2470 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2471 } else if (_substrcmp(*av, "move") == 0) { 2472 av++; 2473 if (av[0] && _substrcmp(*av, "rule") == 0) { 2474 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2475 cmd = IP_FW_XMOVE; 2476 av++; 2477 } else 2478 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2479 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2480 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2481 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2482 rulenum = atoi(av[0]); 2483 rt.new_set = atoi(av[2]); 2484 if (cmd == IP_FW_XMOVE) { 2485 rt.start_rule = rulenum; 2486 rt.end_rule = rulenum; 2487 } else 2488 rt.set = rulenum; 2489 rt.new_set = atoi(av[2]); 2490 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2491 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2492 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2493 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2494 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2495 i = do_range_cmd(cmd, &rt); 2496 if (i < 0) 2497 err(EX_OSERR, "failed to move %s", 2498 cmd == IP_FW_SET_MOVE ? "set": "rule"); 2499 } else if (_substrcmp(*av, "disable") == 0 || 2500 _substrcmp(*av, "enable") == 0 ) { 2501 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2502 2503 av++; 2504 masks[0] = masks[1] = 0; 2505 2506 while (av[0]) { 2507 if (isdigit(**av)) { 2508 i = atoi(*av); 2509 if (i < 0 || i > RESVD_SET) 2510 errx(EX_DATAERR, 2511 "invalid set number %d\n", i); 2512 masks[which] |= (1<<i); 2513 } else if (_substrcmp(*av, "disable") == 0) 2514 which = 0; 2515 else if (_substrcmp(*av, "enable") == 0) 2516 which = 1; 2517 else 2518 errx(EX_DATAERR, 2519 "invalid set command %s\n", *av); 2520 av++; 2521 } 2522 if ( (masks[0] & masks[1]) != 0 ) 2523 errx(EX_DATAERR, 2524 "cannot enable and disable the same set\n"); 2525 2526 rt.set = masks[0]; 2527 rt.new_set = masks[1]; 2528 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2529 if (i) 2530 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2531 } else 2532 errx(EX_USAGE, "invalid set command %s\n", *av); 2533 } 2534 2535 void 2536 ipfw_sysctl_handler(char *av[], int which) 2537 { 2538 av++; 2539 2540 if (av[0] == NULL) { 2541 warnx("missing keyword to enable/disable\n"); 2542 } else if (_substrcmp(*av, "firewall") == 0) { 2543 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2544 &which, sizeof(which)); 2545 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2546 &which, sizeof(which)); 2547 } else if (_substrcmp(*av, "one_pass") == 0) { 2548 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2549 &which, sizeof(which)); 2550 } else if (_substrcmp(*av, "debug") == 0) { 2551 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2552 &which, sizeof(which)); 2553 } else if (_substrcmp(*av, "verbose") == 0) { 2554 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2555 &which, sizeof(which)); 2556 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2557 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2558 &which, sizeof(which)); 2559 #ifndef NO_ALTQ 2560 } else if (_substrcmp(*av, "altq") == 0) { 2561 altq_set_enabled(which); 2562 #endif 2563 } else { 2564 warnx("unrecognize enable/disable keyword: %s\n", *av); 2565 } 2566 } 2567 2568 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2569 void *arg, void *state); 2570 2571 static void 2572 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2573 void *arg __unused, void *_state) 2574 { 2575 ipfw_dyn_rule *d; 2576 int width; 2577 uint8_t set; 2578 2579 d = (ipfw_dyn_rule *)_state; 2580 /* Count _ALL_ states */ 2581 fo->dcnt++; 2582 2583 if (fo->show_counters == 0) 2584 return; 2585 2586 if (co->use_set) { 2587 /* skip states from another set */ 2588 bcopy((char *)&d->rule + sizeof(uint16_t), &set, 2589 sizeof(uint8_t)); 2590 if (set != co->use_set - 1) 2591 return; 2592 } 2593 2594 width = pr_u64(NULL, &d->pcnt, 0); 2595 if (width > fo->pcwidth) 2596 fo->pcwidth = width; 2597 2598 width = pr_u64(NULL, &d->bcnt, 0); 2599 if (width > fo->bcwidth) 2600 fo->bcwidth = width; 2601 } 2602 2603 static int 2604 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2605 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2606 { 2607 int ttype; 2608 state_cb *fptr; 2609 void *farg; 2610 ipfw_obj_tlv *tlv; 2611 ipfw_obj_ctlv *ctlv; 2612 2613 fptr = NULL; 2614 ttype = 0; 2615 2616 while (sz > 0) { 2617 ctlv = (ipfw_obj_ctlv *)base; 2618 switch (ctlv->head.type) { 2619 case IPFW_TLV_DYNSTATE_LIST: 2620 base += sizeof(*ctlv); 2621 sz -= sizeof(*ctlv); 2622 ttype = IPFW_TLV_DYN_ENT; 2623 fptr = dyn_bc; 2624 farg = dyn_arg; 2625 break; 2626 default: 2627 return (sz); 2628 } 2629 2630 while (sz > 0) { 2631 tlv = (ipfw_obj_tlv *)base; 2632 if (tlv->type != ttype) 2633 break; 2634 2635 fptr(co, fo, farg, tlv + 1); 2636 sz -= tlv->length; 2637 base += tlv->length; 2638 } 2639 } 2640 2641 return (sz); 2642 } 2643 2644 static void 2645 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2646 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2647 { 2648 int bcwidth, pcwidth, width; 2649 int n; 2650 struct ip_fw_bcounter *cntr; 2651 struct ip_fw_rule *r; 2652 2653 bcwidth = 0; 2654 pcwidth = 0; 2655 if (fo->show_counters != 0) { 2656 for (n = 0; n < rcnt; n++, 2657 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2658 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2659 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2660 /* skip rules from another set */ 2661 if (co->use_set && r->set != co->use_set - 1) 2662 continue; 2663 2664 /* packet counter */ 2665 width = pr_u64(NULL, &cntr->pcnt, 0); 2666 if (width > pcwidth) 2667 pcwidth = width; 2668 2669 /* byte counter */ 2670 width = pr_u64(NULL, &cntr->bcnt, 0); 2671 if (width > bcwidth) 2672 bcwidth = width; 2673 } 2674 } 2675 fo->bcwidth = bcwidth; 2676 fo->pcwidth = pcwidth; 2677 2678 fo->dcnt = 0; 2679 if (co->do_dynamic && dynsz > 0) 2680 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2681 } 2682 2683 static int 2684 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2685 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2686 { 2687 int n, seen; 2688 struct ip_fw_rule *r; 2689 struct ip_fw_bcounter *cntr; 2690 2691 for (n = seen = 0; n < rcnt; n++, 2692 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2693 2694 if ((fo->show_counters | fo->show_time) != 0) { 2695 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2696 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2697 } else { 2698 cntr = NULL; 2699 r = (struct ip_fw_rule *)(rtlv + 1); 2700 } 2701 if (r->rulenum > fo->last) 2702 break; 2703 if (co->use_set && r->set != co->use_set - 1) 2704 continue; 2705 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2706 show_static_rule(co, fo, bp, r, cntr); 2707 printf("%s", bp->buf); 2708 bp_flush(bp); 2709 seen++; 2710 } 2711 } 2712 2713 return (seen); 2714 } 2715 2716 static void 2717 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2718 void *_arg, void *_state) 2719 { 2720 uint16_t rulenum; 2721 uint8_t set; 2722 ipfw_dyn_rule *d; 2723 struct buf_pr *bp; 2724 2725 d = (ipfw_dyn_rule *)_state; 2726 bp = (struct buf_pr *)_arg; 2727 2728 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 2729 if (rulenum > fo->last) 2730 return; 2731 if (co->use_set) { 2732 bcopy((char *)&d->rule + sizeof(uint16_t), 2733 &set, sizeof(uint8_t)); 2734 if (set != co->use_set - 1) 2735 return; 2736 } 2737 if (rulenum >= fo->first) { 2738 show_dyn_state(co, fo, bp, d); 2739 printf("%s\n", bp->buf); 2740 bp_flush(bp); 2741 } 2742 } 2743 2744 static int 2745 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2746 struct buf_pr *bp, caddr_t base, size_t sz) 2747 { 2748 2749 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2750 return (sz); 2751 } 2752 2753 void 2754 ipfw_list(int ac, char *av[], int show_counters) 2755 { 2756 ipfw_cfg_lheader *cfg; 2757 struct format_opts sfo; 2758 size_t sz; 2759 int error; 2760 int lac; 2761 char **lav; 2762 uint32_t rnum; 2763 char *endptr; 2764 2765 if (g_co.test_only) { 2766 fprintf(stderr, "Testing only, list disabled\n"); 2767 return; 2768 } 2769 if (g_co.do_pipe) { 2770 dummynet_list(ac, av, show_counters); 2771 return; 2772 } 2773 2774 ac--; 2775 av++; 2776 memset(&sfo, 0, sizeof(sfo)); 2777 2778 /* Determine rule range to request */ 2779 if (ac > 0) { 2780 for (lac = ac, lav = av; lac != 0; lac--) { 2781 rnum = strtoul(*lav++, &endptr, 10); 2782 if (sfo.first == 0 || rnum < sfo.first) 2783 sfo.first = rnum; 2784 2785 if (*endptr == '-') 2786 rnum = strtoul(endptr + 1, &endptr, 10); 2787 if (sfo.last == 0 || rnum > sfo.last) 2788 sfo.last = rnum; 2789 } 2790 } 2791 2792 /* get configuraion from kernel */ 2793 cfg = NULL; 2794 sfo.show_counters = show_counters; 2795 sfo.show_time = g_co.do_time; 2796 if (g_co.do_dynamic != 2) 2797 sfo.flags |= IPFW_CFG_GET_STATIC; 2798 if (g_co.do_dynamic != 0) 2799 sfo.flags |= IPFW_CFG_GET_STATES; 2800 if ((sfo.show_counters | sfo.show_time) != 0) 2801 sfo.flags |= IPFW_CFG_GET_COUNTERS; 2802 if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0) 2803 err(EX_OSERR, "retrieving config failed"); 2804 2805 error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av); 2806 2807 free(cfg); 2808 2809 if (error != EX_OK) 2810 exit(error); 2811 } 2812 2813 static int 2814 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 2815 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 2816 { 2817 caddr_t dynbase; 2818 size_t dynsz; 2819 int rcnt; 2820 int exitval = EX_OK; 2821 int lac; 2822 char **lav; 2823 char *endptr; 2824 size_t readsz; 2825 struct buf_pr bp; 2826 ipfw_obj_ctlv *ctlv; 2827 ipfw_obj_tlv *rbase; 2828 2829 /* 2830 * Handle tablenames TLV first, if any 2831 */ 2832 rbase = NULL; 2833 dynbase = NULL; 2834 dynsz = 0; 2835 readsz = sizeof(*cfg); 2836 rcnt = 0; 2837 2838 fo->set_mask = cfg->set_mask; 2839 2840 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 2841 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 2842 object_sort_ctlv(ctlv); 2843 fo->tstate = ctlv; 2844 readsz += ctlv->head.length; 2845 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 2846 } 2847 2848 if (cfg->flags & IPFW_CFG_GET_STATIC) { 2849 /* We've requested static rules */ 2850 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 2851 rbase = (ipfw_obj_tlv *)(ctlv + 1); 2852 rcnt = ctlv->count; 2853 readsz += ctlv->head.length; 2854 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 2855 ctlv->head.length); 2856 } 2857 } 2858 2859 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 2860 /* We may have some dynamic states */ 2861 dynsz = sz - readsz; 2862 /* Skip empty header */ 2863 if (dynsz != sizeof(ipfw_obj_ctlv)) 2864 dynbase = (caddr_t)ctlv; 2865 else 2866 dynsz = 0; 2867 } 2868 2869 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 2870 bp_alloc(&bp, 4096); 2871 2872 /* if no rule numbers were specified, list all rules */ 2873 if (ac == 0) { 2874 fo->first = 0; 2875 fo->last = IPFW_DEFAULT_RULE; 2876 if (cfg->flags & IPFW_CFG_GET_STATIC) 2877 list_static_range(co, fo, &bp, rbase, rcnt); 2878 2879 if (co->do_dynamic && dynsz > 0) { 2880 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, 2881 dynsz); 2882 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2883 } 2884 2885 bp_free(&bp); 2886 return (EX_OK); 2887 } 2888 2889 /* display specific rules requested on command line */ 2890 for (lac = ac, lav = av; lac != 0; lac--) { 2891 /* convert command line rule # */ 2892 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2893 if (*endptr == '-') 2894 fo->last = strtoul(endptr + 1, &endptr, 10); 2895 if (*endptr) { 2896 exitval = EX_USAGE; 2897 warnx("invalid rule number: %s", *(lav - 1)); 2898 continue; 2899 } 2900 2901 if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0) 2902 continue; 2903 2904 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 2905 /* give precedence to other error(s) */ 2906 if (exitval == EX_OK) 2907 exitval = EX_UNAVAILABLE; 2908 if (fo->first == fo->last) 2909 warnx("rule %u does not exist", fo->first); 2910 else 2911 warnx("no rules in range %u-%u", 2912 fo->first, fo->last); 2913 } 2914 } 2915 2916 if (co->do_dynamic && dynsz > 0) { 2917 printf("## Dynamic rules:\n"); 2918 for (lac = ac, lav = av; lac != 0; lac--) { 2919 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 2920 if (*endptr == '-') 2921 fo->last = strtoul(endptr+1, &endptr, 10); 2922 if (*endptr) 2923 /* already warned */ 2924 continue; 2925 list_dyn_range(co, fo, &bp, dynbase, dynsz); 2926 } 2927 } 2928 2929 bp_free(&bp); 2930 return (exitval); 2931 } 2932 2933 2934 /* 2935 * Retrieves current ipfw configuration of given type 2936 * and stores its pointer to @pcfg. 2937 * 2938 * Caller is responsible for freeing @pcfg. 2939 * 2940 * Returns 0 on success. 2941 */ 2942 2943 static int 2944 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 2945 ipfw_cfg_lheader **pcfg, size_t *psize) 2946 { 2947 ipfw_cfg_lheader *cfg; 2948 size_t sz; 2949 int i; 2950 2951 2952 if (co->test_only != 0) { 2953 fprintf(stderr, "Testing only, list disabled\n"); 2954 return (0); 2955 } 2956 2957 /* Start with some data size */ 2958 sz = 4096; 2959 cfg = NULL; 2960 2961 for (i = 0; i < 16; i++) { 2962 if (cfg != NULL) 2963 free(cfg); 2964 if ((cfg = calloc(1, sz)) == NULL) 2965 return (ENOMEM); 2966 2967 cfg->flags = fo->flags; 2968 cfg->start_rule = fo->first; 2969 cfg->end_rule = fo->last; 2970 2971 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 2972 if (errno != ENOMEM) { 2973 free(cfg); 2974 return (errno); 2975 } 2976 2977 /* Buffer size is not enough. Try to increase */ 2978 sz = sz * 2; 2979 if (sz < cfg->size) 2980 sz = cfg->size; 2981 continue; 2982 } 2983 2984 *pcfg = cfg; 2985 *psize = sz; 2986 return (0); 2987 } 2988 2989 free(cfg); 2990 return (ENOMEM); 2991 } 2992 2993 static int 2994 lookup_host (char *host, struct in_addr *ipaddr) 2995 { 2996 struct hostent *he; 2997 2998 if (!inet_aton(host, ipaddr)) { 2999 if ((he = gethostbyname(host)) == NULL) 3000 return(-1); 3001 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 3002 } 3003 return(0); 3004 } 3005 3006 struct tidx { 3007 ipfw_obj_ntlv *idx; 3008 uint32_t count; 3009 uint32_t size; 3010 uint16_t counter; 3011 uint8_t set; 3012 }; 3013 3014 int 3015 ipfw_check_object_name(const char *name) 3016 { 3017 int c, i, l; 3018 3019 /* 3020 * Check that name is null-terminated and contains 3021 * valid symbols only. Valid mask is: 3022 * [a-zA-Z0-9\-_\.]{1,63} 3023 */ 3024 l = strlen(name); 3025 if (l == 0 || l >= 64) 3026 return (EINVAL); 3027 for (i = 0; i < l; i++) { 3028 c = name[i]; 3029 if (isalpha(c) || isdigit(c) || c == '_' || 3030 c == '-' || c == '.') 3031 continue; 3032 return (EINVAL); 3033 } 3034 return (0); 3035 } 3036 3037 static const char *default_state_name = "default"; 3038 3039 static int 3040 state_check_name(const char *name) 3041 { 3042 3043 if (ipfw_check_object_name(name) != 0) 3044 return (EINVAL); 3045 if (strcmp(name, "any") == 0) 3046 return (EINVAL); 3047 return (0); 3048 } 3049 3050 static int 3051 eaction_check_name(const char *name) 3052 { 3053 3054 if (ipfw_check_object_name(name) != 0) 3055 return (EINVAL); 3056 /* Restrict some 'special' names */ 3057 if (match_token(rule_actions, name) != -1 && 3058 match_token(rule_action_params, name) != -1) 3059 return (EINVAL); 3060 return (0); 3061 } 3062 3063 static uint16_t 3064 pack_object(struct tidx *tstate, const char *name, int otype) 3065 { 3066 ipfw_obj_ntlv *ntlv; 3067 uint32_t i; 3068 3069 for (i = 0; i < tstate->count; i++) { 3070 if (strcmp(tstate->idx[i].name, name) != 0) 3071 continue; 3072 if (tstate->idx[i].set != tstate->set) 3073 continue; 3074 if (tstate->idx[i].head.type != otype) 3075 continue; 3076 3077 return (tstate->idx[i].idx); 3078 } 3079 3080 if (tstate->count + 1 > tstate->size) { 3081 tstate->size += 4; 3082 tstate->idx = realloc(tstate->idx, tstate->size * 3083 sizeof(ipfw_obj_ntlv)); 3084 if (tstate->idx == NULL) 3085 return (0); 3086 } 3087 3088 ntlv = &tstate->idx[i]; 3089 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 3090 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 3091 ntlv->head.type = otype; 3092 ntlv->head.length = sizeof(ipfw_obj_ntlv); 3093 ntlv->set = tstate->set; 3094 ntlv->idx = ++tstate->counter; 3095 tstate->count++; 3096 3097 return (ntlv->idx); 3098 } 3099 3100 static uint16_t 3101 pack_table(struct tidx *tstate, const char *name) 3102 { 3103 3104 if (table_check_name(name) != 0) 3105 return (0); 3106 3107 return (pack_object(tstate, name, IPFW_TLV_TBL_NAME)); 3108 } 3109 3110 void 3111 fill_table(struct _ipfw_insn *cmd, char *av, uint8_t opcode, 3112 struct tidx *tstate) 3113 { 3114 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3115 uint16_t uidx; 3116 char *p; 3117 3118 if ((p = strchr(av + 6, ')')) == NULL) 3119 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 3120 *p = '\0'; 3121 p = strchr(av + 6, ','); 3122 if (p) 3123 *p++ = '\0'; 3124 3125 if ((uidx = pack_table(tstate, av + 6)) == 0) 3126 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 3127 3128 cmd->opcode = opcode; 3129 cmd->arg1 = uidx; 3130 if (p) { 3131 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 3132 d[0] = strtoul(p, NULL, 0); 3133 } else 3134 cmd->len |= F_INSN_SIZE(ipfw_insn); 3135 } 3136 3137 3138 /* 3139 * fills the addr and mask fields in the instruction as appropriate from av. 3140 * Update length as appropriate. 3141 * The following formats are allowed: 3142 * me returns O_IP_*_ME 3143 * 1.2.3.4 single IP address 3144 * 1.2.3.4:5.6.7.8 address:mask 3145 * 1.2.3.4/24 address/mask 3146 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 3147 * We can have multiple comma-separated address/mask entries. 3148 */ 3149 static void 3150 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 3151 { 3152 int len = 0; 3153 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3154 3155 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 3156 3157 if (_substrcmp(av, "any") == 0) 3158 return; 3159 3160 if (_substrcmp(av, "me") == 0) { 3161 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 3162 return; 3163 } 3164 3165 if (strncmp(av, "table(", 6) == 0) { 3166 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 3167 return; 3168 } 3169 3170 while (av) { 3171 /* 3172 * After the address we can have '/' or ':' indicating a mask, 3173 * ',' indicating another address follows, '{' indicating a 3174 * set of addresses of unspecified size. 3175 */ 3176 char *t = NULL, *p = strpbrk(av, "/:,{"); 3177 int masklen; 3178 char md, nd = '\0'; 3179 3180 CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len); 3181 3182 if (p) { 3183 md = *p; 3184 *p++ = '\0'; 3185 if ((t = strpbrk(p, ",{")) != NULL) { 3186 nd = *t; 3187 *t = '\0'; 3188 } 3189 } else 3190 md = '\0'; 3191 3192 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 3193 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 3194 switch (md) { 3195 case ':': 3196 if (!inet_aton(p, (struct in_addr *)&d[1])) 3197 errx(EX_DATAERR, "bad netmask ``%s''", p); 3198 break; 3199 case '/': 3200 masklen = atoi(p); 3201 if (masklen == 0) 3202 d[1] = htonl(0U); /* mask */ 3203 else if (masklen > 32) 3204 errx(EX_DATAERR, "bad width ``%s''", p); 3205 else 3206 d[1] = htonl(~0U << (32 - masklen)); 3207 break; 3208 case '{': /* no mask, assume /24 and put back the '{' */ 3209 d[1] = htonl(~0U << (32 - 24)); 3210 *(--p) = md; 3211 break; 3212 3213 case ',': /* single address plus continuation */ 3214 *(--p) = md; 3215 /* FALLTHROUGH */ 3216 case 0: /* initialization value */ 3217 default: 3218 d[1] = htonl(~0U); /* force /32 */ 3219 break; 3220 } 3221 d[0] &= d[1]; /* mask base address with mask */ 3222 if (t) 3223 *t = nd; 3224 /* find next separator */ 3225 if (p) 3226 p = strpbrk(p, ",{"); 3227 if (p && *p == '{') { 3228 /* 3229 * We have a set of addresses. They are stored as follows: 3230 * arg1 is the set size (powers of 2, 2..256) 3231 * addr is the base address IN HOST FORMAT 3232 * mask.. is an array of arg1 bits (rounded up to 3233 * the next multiple of 32) with bits set 3234 * for each host in the map. 3235 */ 3236 uint32_t *map = (uint32_t *)&cmd->mask; 3237 int low, high; 3238 int i = contigmask((uint8_t *)&(d[1]), 32); 3239 3240 if (len > 0) 3241 errx(EX_DATAERR, "address set cannot be in a list"); 3242 if (i < 24 || i > 31) 3243 errx(EX_DATAERR, "invalid set with mask %d\n", i); 3244 cmd->o.arg1 = 1<<(32-i); /* map length */ 3245 d[0] = ntohl(d[0]); /* base addr in host format */ 3246 cmd->o.opcode = O_IP_DST_SET; /* default */ 3247 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 3248 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 3249 map[i] = 0; /* clear map */ 3250 3251 av = p + 1; 3252 low = d[0] & 0xff; 3253 high = low + cmd->o.arg1 - 1; 3254 /* 3255 * Here, i stores the previous value when we specify a range 3256 * of addresses within a mask, e.g. 45-63. i = -1 means we 3257 * have no previous value. 3258 */ 3259 i = -1; /* previous value in a range */ 3260 while (isdigit(*av)) { 3261 char *s; 3262 int a = strtol(av, &s, 0); 3263 3264 if (s == av) { /* no parameter */ 3265 if (*av != '}') 3266 errx(EX_DATAERR, "set not closed\n"); 3267 if (i != -1) 3268 errx(EX_DATAERR, "incomplete range %d-", i); 3269 break; 3270 } 3271 if (a < low || a > high) 3272 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 3273 a, low, high); 3274 a -= low; 3275 if (i == -1) /* no previous in range */ 3276 i = a; 3277 else { /* check that range is valid */ 3278 if (i > a) 3279 errx(EX_DATAERR, "invalid range %d-%d", 3280 i+low, a+low); 3281 if (*s == '-') 3282 errx(EX_DATAERR, "double '-' in range"); 3283 } 3284 for (; i <= a; i++) 3285 map[i/32] |= 1<<(i & 31); 3286 i = -1; 3287 if (*s == '-') 3288 i = a; 3289 else if (*s == '}') 3290 break; 3291 av = s+1; 3292 } 3293 return; 3294 } 3295 av = p; 3296 if (av) /* then *av must be a ',' */ 3297 av++; 3298 3299 /* Check this entry */ 3300 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 3301 /* 3302 * 'any' turns the entire list into a NOP. 3303 * 'not any' never matches, so it is removed from the 3304 * list unless it is the only item, in which case we 3305 * report an error. 3306 */ 3307 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 3308 if (av == NULL && len == 0) /* only this entry */ 3309 errx(EX_DATAERR, "not any never matches"); 3310 } 3311 /* else do nothing and skip this entry */ 3312 return; 3313 } 3314 /* A single IP can be stored in an optimized format */ 3315 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 3316 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 3317 return; 3318 } 3319 len += 2; /* two words... */ 3320 d += 2; 3321 } /* end while */ 3322 if (len + 1 > F_LEN_MASK) 3323 errx(EX_DATAERR, "address list too long"); 3324 cmd->o.len |= len+1; 3325 } 3326 3327 3328 /* n2mask sets n bits of the mask */ 3329 void 3330 n2mask(struct in6_addr *mask, int n) 3331 { 3332 static int minimask[9] = 3333 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 3334 u_char *p; 3335 3336 memset(mask, 0, sizeof(struct in6_addr)); 3337 p = (u_char *) mask; 3338 for (; n > 0; p++, n -= 8) { 3339 if (n >= 8) 3340 *p = 0xff; 3341 else 3342 *p = minimask[n]; 3343 } 3344 return; 3345 } 3346 3347 static void 3348 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 3349 struct _s_x *flags, char *p) 3350 { 3351 char *e; 3352 uint32_t set = 0, clear = 0; 3353 3354 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3355 errx(EX_DATAERR, "invalid flag %s", e); 3356 3357 cmd->opcode = opcode; 3358 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3359 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3360 } 3361 3362 3363 void 3364 ipfw_delete(char *av[]) 3365 { 3366 ipfw_range_tlv rt; 3367 char *sep; 3368 int i, j; 3369 int exitval = EX_OK; 3370 int do_set = 0; 3371 3372 av++; 3373 NEED1("missing rule specification"); 3374 if ( *av && _substrcmp(*av, "set") == 0) { 3375 /* Do not allow using the following syntax: 3376 * ipfw set N delete set M 3377 */ 3378 if (g_co.use_set) 3379 errx(EX_DATAERR, "invalid syntax"); 3380 do_set = 1; /* delete set */ 3381 av++; 3382 } 3383 3384 /* Rule number */ 3385 while (*av && isdigit(**av)) { 3386 i = strtol(*av, &sep, 10); 3387 j = i; 3388 if (*sep== '-') 3389 j = strtol(sep + 1, NULL, 10); 3390 av++; 3391 if (g_co.do_nat) { 3392 exitval = ipfw_delete_nat(i); 3393 } else if (g_co.do_pipe) { 3394 exitval = ipfw_delete_pipe(g_co.do_pipe, i); 3395 } else { 3396 memset(&rt, 0, sizeof(rt)); 3397 if (do_set != 0) { 3398 rt.set = i & 31; 3399 rt.flags = IPFW_RCFLAG_SET; 3400 } else { 3401 rt.start_rule = i & 0xffff; 3402 rt.end_rule = j & 0xffff; 3403 if (rt.start_rule == 0 && rt.end_rule == 0) 3404 rt.flags |= IPFW_RCFLAG_ALL; 3405 else 3406 rt.flags |= IPFW_RCFLAG_RANGE; 3407 if (g_co.use_set != 0) { 3408 rt.set = g_co.use_set - 1; 3409 rt.flags |= IPFW_RCFLAG_SET; 3410 } 3411 } 3412 if (g_co.do_dynamic == 2) 3413 rt.flags |= IPFW_RCFLAG_DYNAMIC; 3414 i = do_range_cmd(IP_FW_XDEL, &rt); 3415 if (i != 0) { 3416 exitval = EX_UNAVAILABLE; 3417 if (g_co.do_quiet) 3418 continue; 3419 warn("rule %u: setsockopt(IP_FW_XDEL)", 3420 rt.start_rule); 3421 } else if (rt.new_set == 0 && do_set == 0 && 3422 g_co.do_dynamic != 2) { 3423 exitval = EX_UNAVAILABLE; 3424 if (g_co.do_quiet) 3425 continue; 3426 if (rt.start_rule != rt.end_rule) 3427 warnx("no rules rules in %u-%u range", 3428 rt.start_rule, rt.end_rule); 3429 else 3430 warnx("rule %u not found", 3431 rt.start_rule); 3432 } 3433 } 3434 } 3435 if (exitval != EX_OK && g_co.do_force == 0) 3436 exit(exitval); 3437 } 3438 3439 3440 /* 3441 * fill the interface structure. We do not check the name as we can 3442 * create interfaces dynamically, so checking them at insert time 3443 * makes relatively little sense. 3444 * Interface names containing '*', '?', or '[' are assumed to be shell 3445 * patterns which match interfaces. 3446 */ 3447 static void 3448 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3449 { 3450 char *p; 3451 uint16_t uidx; 3452 3453 cmd->name[0] = '\0'; 3454 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3455 3456 CHECK_CMDLEN; 3457 3458 /* Parse the interface or address */ 3459 if (strcmp(arg, "any") == 0) 3460 cmd->o.len = 0; /* effectively ignore this command */ 3461 else if (strncmp(arg, "table(", 6) == 0) { 3462 if ((p = strchr(arg + 6, ')')) == NULL) 3463 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3464 *p = '\0'; 3465 p = strchr(arg + 6, ','); 3466 if (p) 3467 *p++ = '\0'; 3468 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3469 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3470 3471 cmd->name[0] = '\1'; /* Special value indicating table */ 3472 cmd->p.kidx = uidx; 3473 } else if (!isdigit(*arg)) { 3474 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3475 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3476 } else if (!inet_aton(arg, &cmd->p.ip)) 3477 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3478 } 3479 3480 static void 3481 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3482 { 3483 int i; 3484 size_t l; 3485 char *ap, *ptr, *optr; 3486 struct ether_addr *mac; 3487 const char *macset = "0123456789abcdefABCDEF:"; 3488 3489 if (strcmp(p, "any") == 0) { 3490 for (i = 0; i < ETHER_ADDR_LEN; i++) 3491 addr[i] = mask[i] = 0; 3492 return; 3493 } 3494 3495 optr = ptr = strdup(p); 3496 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3497 l = strlen(ap); 3498 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3499 errx(EX_DATAERR, "Incorrect MAC address"); 3500 bcopy(mac, addr, ETHER_ADDR_LEN); 3501 } else 3502 errx(EX_DATAERR, "Incorrect MAC address"); 3503 3504 if (ptr != NULL) { /* we have mask? */ 3505 if (p[ptr - optr - 1] == '/') { /* mask len */ 3506 long ml = strtol(ptr, &ap, 10); 3507 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3508 errx(EX_DATAERR, "Incorrect mask length"); 3509 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3510 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3511 } else { /* mask */ 3512 l = strlen(ptr); 3513 if (strspn(ptr, macset) != l || 3514 (mac = ether_aton(ptr)) == NULL) 3515 errx(EX_DATAERR, "Incorrect mask"); 3516 bcopy(mac, mask, ETHER_ADDR_LEN); 3517 } 3518 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3519 for (i = 0; i < ETHER_ADDR_LEN; i++) 3520 mask[i] = 0xff; 3521 } 3522 for (i = 0; i < ETHER_ADDR_LEN; i++) 3523 addr[i] &= mask[i]; 3524 3525 free(optr); 3526 } 3527 3528 /* 3529 * helper function, updates the pointer to cmd with the length 3530 * of the current command, and also cleans up the first word of 3531 * the new command in case it has been clobbered before. 3532 */ 3533 static ipfw_insn * 3534 next_cmd(ipfw_insn *cmd, int *len) 3535 { 3536 *len -= F_LEN(cmd); 3537 CHECK_LENGTH(*len, 0); 3538 cmd += F_LEN(cmd); 3539 bzero(cmd, sizeof(*cmd)); 3540 return cmd; 3541 } 3542 3543 /* 3544 * Takes arguments and copies them into a comment 3545 */ 3546 static void 3547 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3548 { 3549 int i, l; 3550 char *p = (char *)(cmd + 1); 3551 3552 cmd->opcode = O_NOP; 3553 cmd->len = (cmd->len & (F_NOT | F_OR)); 3554 3555 /* Compute length of comment string. */ 3556 for (i = 0, l = 0; av[i] != NULL; i++) 3557 l += strlen(av[i]) + 1; 3558 if (l == 0) 3559 return; 3560 if (l > 84) 3561 errx(EX_DATAERR, 3562 "comment too long (max 80 chars)"); 3563 l = 1 + (l+3)/4; 3564 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3565 CHECK_CMDLEN; 3566 3567 for (i = 0; av[i] != NULL; i++) { 3568 strcpy(p, av[i]); 3569 p += strlen(av[i]); 3570 *p++ = ' '; 3571 } 3572 *(--p) = '\0'; 3573 } 3574 3575 /* 3576 * A function to fill simple commands of size 1. 3577 * Existing flags are preserved. 3578 */ 3579 static void 3580 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3581 { 3582 cmd->opcode = opcode; 3583 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3584 cmd->arg1 = arg; 3585 } 3586 3587 /* 3588 * Fetch and add the MAC address and type, with masks. This generates one or 3589 * two microinstructions, and returns the pointer to the last one. 3590 */ 3591 static ipfw_insn * 3592 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3593 { 3594 ipfw_insn_mac *mac; 3595 3596 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3597 errx(EX_DATAERR, "MAC dst src"); 3598 3599 cmd->opcode = O_MACADDR2; 3600 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3601 CHECK_CMDLEN; 3602 3603 mac = (ipfw_insn_mac *)cmd; 3604 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3605 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3606 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3607 return cmd; 3608 } 3609 3610 static ipfw_insn * 3611 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3612 { 3613 if (!av) 3614 errx(EX_DATAERR, "missing MAC type"); 3615 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3616 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3617 cblen); 3618 cmd->opcode = O_MAC_TYPE; 3619 return cmd; 3620 } else 3621 return NULL; 3622 } 3623 3624 static ipfw_insn * 3625 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3626 { 3627 struct protoent *pe; 3628 char *ep; 3629 int proto; 3630 3631 proto = strtol(av, &ep, 10); 3632 if (*ep != '\0' || proto <= 0) { 3633 if ((pe = getprotobyname(av)) == NULL) 3634 return NULL; 3635 proto = pe->p_proto; 3636 } 3637 3638 fill_cmd(cmd, O_PROTO, 0, proto); 3639 *protop = proto; 3640 return cmd; 3641 } 3642 3643 static ipfw_insn * 3644 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3645 { 3646 u_char proto = IPPROTO_IP; 3647 3648 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3649 ; /* do not set O_IP4 nor O_IP6 */ 3650 else if (strcmp(av, "ip4") == 0) 3651 /* explicit "just IPv4" rule */ 3652 fill_cmd(cmd, O_IP4, 0, 0); 3653 else if (strcmp(av, "ip6") == 0) { 3654 /* explicit "just IPv6" rule */ 3655 proto = IPPROTO_IPV6; 3656 fill_cmd(cmd, O_IP6, 0, 0); 3657 } else 3658 return add_proto0(cmd, av, protop); 3659 3660 *protop = proto; 3661 return cmd; 3662 } 3663 3664 static ipfw_insn * 3665 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3666 { 3667 u_char proto = IPPROTO_IP; 3668 3669 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3670 ; /* do not set O_IP4 nor O_IP6 */ 3671 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3672 /* explicit "just IPv4" rule */ 3673 fill_cmd(cmd, O_IP4, 0, 0); 3674 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3675 /* explicit "just IPv6" rule */ 3676 proto = IPPROTO_IPV6; 3677 fill_cmd(cmd, O_IP6, 0, 0); 3678 } else 3679 return add_proto0(cmd, av, protop); 3680 3681 *protop = proto; 3682 return cmd; 3683 } 3684 3685 static ipfw_insn * 3686 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3687 { 3688 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3689 if (cmd->opcode == O_IP_DST_SET) /* set */ 3690 cmd->opcode = O_IP_SRC_SET; 3691 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3692 cmd->opcode = O_IP_SRC_LOOKUP; 3693 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3694 cmd->opcode = O_IP_SRC_ME; 3695 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3696 cmd->opcode = O_IP_SRC; 3697 else /* addr/mask */ 3698 cmd->opcode = O_IP_SRC_MASK; 3699 return cmd; 3700 } 3701 3702 static ipfw_insn * 3703 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3704 { 3705 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3706 if (cmd->opcode == O_IP_DST_SET) /* set */ 3707 ; 3708 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3709 ; 3710 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3711 cmd->opcode = O_IP_DST_ME; 3712 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3713 cmd->opcode = O_IP_DST; 3714 else /* addr/mask */ 3715 cmd->opcode = O_IP_DST_MASK; 3716 return cmd; 3717 } 3718 3719 static ipfw_insn * 3720 add_srcmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3721 { 3722 3723 if (strncmp(av, "table(", 6) == 0) 3724 fill_table(cmd, av, O_MAC_SRC_LOOKUP, tstate); 3725 else 3726 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3727 return cmd; 3728 } 3729 3730 static ipfw_insn * 3731 add_dstmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3732 { 3733 3734 if (strncmp(av, "table(", 6) == 0) 3735 fill_table(cmd, av, O_MAC_DST_LOOKUP, tstate); 3736 else 3737 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3738 return cmd; 3739 } 3740 3741 3742 static struct _s_x f_reserved_keywords[] = { 3743 { "altq", TOK_OR }, 3744 { "//", TOK_OR }, 3745 { "diverted", TOK_OR }, 3746 { "dst-port", TOK_OR }, 3747 { "src-port", TOK_OR }, 3748 { "established", TOK_OR }, 3749 { "keep-state", TOK_OR }, 3750 { "frag", TOK_OR }, 3751 { "icmptypes", TOK_OR }, 3752 { "in", TOK_OR }, 3753 { "out", TOK_OR }, 3754 { "ip6", TOK_OR }, 3755 { "any", TOK_OR }, 3756 { "to", TOK_OR }, 3757 { "via", TOK_OR }, 3758 { "{", TOK_OR }, 3759 { NULL, 0 } /* terminator */ 3760 }; 3761 3762 static ipfw_insn * 3763 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3764 { 3765 3766 if (match_token(f_reserved_keywords, av) != -1) 3767 return (NULL); 3768 3769 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3770 /* XXX todo: check that we have a protocol with ports */ 3771 cmd->opcode = opcode; 3772 return cmd; 3773 } 3774 return NULL; 3775 } 3776 3777 static ipfw_insn * 3778 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3779 { 3780 struct in6_addr a; 3781 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3782 ipfw_insn *ret = NULL; 3783 size_t len; 3784 3785 /* Copy first address in set if needed */ 3786 if ((ch = strpbrk(av, "/,")) != NULL) { 3787 len = ch - av; 3788 strlcpy(buf, av, sizeof(buf)); 3789 if (len < sizeof(buf)) 3790 buf[len] = '\0'; 3791 host = buf; 3792 } else 3793 host = av; 3794 3795 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3796 inet_pton(AF_INET6, host, &a) == 1) 3797 ret = add_srcip6(cmd, av, cblen, tstate); 3798 /* XXX: should check for IPv4, not !IPv6 */ 3799 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3800 inet_pton(AF_INET6, host, &a) != 1)) 3801 ret = add_srcip(cmd, av, cblen, tstate); 3802 if (ret == NULL && strcmp(av, "any") != 0) 3803 ret = cmd; 3804 3805 return ret; 3806 } 3807 3808 static ipfw_insn * 3809 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 3810 { 3811 struct in6_addr a; 3812 char *host, *ch, buf[INET6_ADDRSTRLEN]; 3813 ipfw_insn *ret = NULL; 3814 size_t len; 3815 3816 /* Copy first address in set if needed */ 3817 if ((ch = strpbrk(av, "/,")) != NULL) { 3818 len = ch - av; 3819 strlcpy(buf, av, sizeof(buf)); 3820 if (len < sizeof(buf)) 3821 buf[len] = '\0'; 3822 host = buf; 3823 } else 3824 host = av; 3825 3826 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 3827 inet_pton(AF_INET6, host, &a) == 1) 3828 ret = add_dstip6(cmd, av, cblen, tstate); 3829 /* XXX: should check for IPv4, not !IPv6 */ 3830 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 3831 inet_pton(AF_INET6, host, &a) != 1)) 3832 ret = add_dstip(cmd, av, cblen, tstate); 3833 if (ret == NULL && strcmp(av, "any") != 0) 3834 ret = cmd; 3835 3836 return ret; 3837 } 3838 3839 /* 3840 * Parse arguments and assemble the microinstructions which make up a rule. 3841 * Rules are added into the 'rulebuf' and then copied in the correct order 3842 * into the actual rule. 3843 * 3844 * The syntax for a rule starts with the action, followed by 3845 * optional action parameters, and the various match patterns. 3846 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 3847 * (generated if the rule includes a keep-state option), then the 3848 * various match patterns, log/altq actions, and the actual action. 3849 * 3850 */ 3851 static void 3852 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 3853 { 3854 /* 3855 * rules are added into the 'rulebuf' and then copied in 3856 * the correct order into the actual rule. 3857 * Some things that need to go out of order (prob, action etc.) 3858 * go into actbuf[]. 3859 */ 3860 static uint32_t actbuf[255], cmdbuf[255]; 3861 int rblen, ablen, cblen; 3862 3863 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 3864 ipfw_insn *first_cmd; /* first match pattern */ 3865 3866 struct ip_fw_rule *rule; 3867 3868 /* 3869 * various flags used to record that we entered some fields. 3870 */ 3871 ipfw_insn *have_state = NULL; /* any state-related option */ 3872 int have_rstate = 0; 3873 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 3874 ipfw_insn *have_skipcmd = NULL; 3875 size_t len; 3876 3877 int i; 3878 3879 int open_par = 0; /* open parenthesis ( */ 3880 3881 /* proto is here because it is used to fetch ports */ 3882 u_char proto = IPPROTO_IP; /* default protocol */ 3883 3884 double match_prob = 1; /* match probability, default is always match */ 3885 3886 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 3887 bzero(cmdbuf, sizeof(cmdbuf)); 3888 bzero(rbuf, *rbufsize); 3889 3890 rule = (struct ip_fw_rule *)rbuf; 3891 cmd = (ipfw_insn *)cmdbuf; 3892 action = (ipfw_insn *)actbuf; 3893 3894 rblen = *rbufsize / sizeof(uint32_t); 3895 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 3896 ablen = sizeof(actbuf) / sizeof(actbuf[0]); 3897 cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); 3898 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 3899 3900 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 3901 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 3902 3903 av++; 3904 3905 /* [rule N] -- Rule number optional */ 3906 if (av[0] && isdigit(**av)) { 3907 rule->rulenum = atoi(*av); 3908 av++; 3909 } 3910 3911 /* [set N] -- set number (0..RESVD_SET), optional */ 3912 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 3913 int set = strtoul(av[1], NULL, 10); 3914 if (set < 0 || set > RESVD_SET) 3915 errx(EX_DATAERR, "illegal set %s", av[1]); 3916 rule->set = set; 3917 tstate->set = set; 3918 av += 2; 3919 } 3920 3921 /* [prob D] -- match probability, optional */ 3922 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 3923 match_prob = strtod(av[1], NULL); 3924 3925 if (match_prob <= 0 || match_prob > 1) 3926 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 3927 av += 2; 3928 } 3929 3930 /* action -- mandatory */ 3931 NEED1("missing action"); 3932 i = match_token(rule_actions, *av); 3933 av++; 3934 action->len = 1; /* default */ 3935 CHECK_ACTLEN; 3936 switch(i) { 3937 case TOK_CHECKSTATE: 3938 have_state = action; 3939 action->opcode = O_CHECK_STATE; 3940 if (*av == NULL || 3941 match_token(rule_options, *av) == TOK_COMMENT) { 3942 action->arg1 = pack_object(tstate, 3943 default_state_name, IPFW_TLV_STATE_NAME); 3944 break; 3945 } 3946 if (*av[0] == ':') { 3947 if (strcmp(*av + 1, "any") == 0) 3948 action->arg1 = 0; 3949 else if (state_check_name(*av + 1) == 0) 3950 action->arg1 = pack_object(tstate, *av + 1, 3951 IPFW_TLV_STATE_NAME); 3952 else 3953 errx(EX_DATAERR, "Invalid state name %s", 3954 *av); 3955 av++; 3956 break; 3957 } 3958 errx(EX_DATAERR, "Invalid state name %s", *av); 3959 break; 3960 3961 case TOK_ABORT: 3962 action->opcode = O_REJECT; 3963 action->arg1 = ICMP_REJECT_ABORT; 3964 break; 3965 3966 case TOK_ABORT6: 3967 action->opcode = O_UNREACH6; 3968 action->arg1 = ICMP6_UNREACH_ABORT; 3969 break; 3970 3971 case TOK_ACCEPT: 3972 action->opcode = O_ACCEPT; 3973 break; 3974 3975 case TOK_DENY: 3976 action->opcode = O_DENY; 3977 action->arg1 = 0; 3978 break; 3979 3980 case TOK_REJECT: 3981 action->opcode = O_REJECT; 3982 action->arg1 = ICMP_UNREACH_HOST; 3983 break; 3984 3985 case TOK_RESET: 3986 action->opcode = O_REJECT; 3987 action->arg1 = ICMP_REJECT_RST; 3988 break; 3989 3990 case TOK_RESET6: 3991 action->opcode = O_UNREACH6; 3992 action->arg1 = ICMP6_UNREACH_RST; 3993 break; 3994 3995 case TOK_UNREACH: 3996 action->opcode = O_REJECT; 3997 NEED1("missing reject code"); 3998 fill_reject_code(&action->arg1, *av); 3999 av++; 4000 if (action->arg1 == ICMP_UNREACH_NEEDFRAG && isdigit(**av)) { 4001 uint16_t mtu; 4002 4003 mtu = strtoul(*av, NULL, 10); 4004 if (mtu < 68 || mtu >= IP_MAXPACKET) 4005 errx(EX_DATAERR, "illegal argument for %s", 4006 *(av - 1)); 4007 action->len = F_INSN_SIZE(ipfw_insn_u16); 4008 ((ipfw_insn_u16 *)action)->ports[0] = mtu; 4009 av++; 4010 } 4011 break; 4012 4013 case TOK_UNREACH6: 4014 action->opcode = O_UNREACH6; 4015 NEED1("missing unreach code"); 4016 fill_unreach6_code(&action->arg1, *av); 4017 av++; 4018 break; 4019 4020 case TOK_COUNT: 4021 action->opcode = O_COUNT; 4022 break; 4023 4024 case TOK_NAT: 4025 action->opcode = O_NAT; 4026 action->len = F_INSN_SIZE(ipfw_insn_nat); 4027 CHECK_ACTLEN; 4028 if (*av != NULL && _substrcmp(*av, "global") == 0) { 4029 action->arg1 = IP_FW_NAT44_GLOBAL; 4030 av++; 4031 break; 4032 } else 4033 goto chkarg; 4034 case TOK_QUEUE: 4035 action->opcode = O_QUEUE; 4036 goto chkarg; 4037 case TOK_PIPE: 4038 action->opcode = O_PIPE; 4039 goto chkarg; 4040 case TOK_SKIPTO: 4041 action->opcode = O_SKIPTO; 4042 goto chkarg; 4043 case TOK_NETGRAPH: 4044 action->opcode = O_NETGRAPH; 4045 goto chkarg; 4046 case TOK_NGTEE: 4047 action->opcode = O_NGTEE; 4048 goto chkarg; 4049 case TOK_DIVERT: 4050 action->opcode = O_DIVERT; 4051 goto chkarg; 4052 case TOK_TEE: 4053 action->opcode = O_TEE; 4054 goto chkarg; 4055 case TOK_CALL: 4056 action->opcode = O_CALLRETURN; 4057 chkarg: 4058 if (!av[0]) 4059 errx(EX_USAGE, "missing argument for %s", *(av - 1)); 4060 if (isdigit(**av)) { 4061 action->arg1 = strtoul(*av, NULL, 10); 4062 if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) 4063 errx(EX_DATAERR, "illegal argument for %s", 4064 *(av - 1)); 4065 } else if (_substrcmp(*av, "tablearg") == 0) { 4066 action->arg1 = IP_FW_TARG; 4067 } else if (i == TOK_DIVERT || i == TOK_TEE) { 4068 struct servent *s; 4069 setservent(1); 4070 s = getservbyname(av[0], "divert"); 4071 if (s != NULL) 4072 action->arg1 = ntohs(s->s_port); 4073 else 4074 errx(EX_DATAERR, "illegal divert/tee port"); 4075 } else 4076 errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); 4077 av++; 4078 break; 4079 4080 case TOK_FORWARD: { 4081 /* 4082 * Locate the address-port separator (':' or ','). 4083 * Could be one of the following: 4084 * hostname:port 4085 * IPv4 a.b.c.d,port 4086 * IPv4 a.b.c.d:port 4087 * IPv6 w:x:y::z,port 4088 * IPv6 [w:x:y::z]:port 4089 */ 4090 struct sockaddr_storage result; 4091 struct addrinfo *res; 4092 char *s, *end; 4093 int family; 4094 u_short port_number = 0; 4095 4096 NEED1("missing forward address[:port]"); 4097 4098 if (strncmp(*av, "tablearg", 8) == 0 && 4099 ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':')) 4100 memcpy(++(*av), "0.0.0.0", 7); 4101 4102 /* 4103 * Are we an bracket-enclosed IPv6 address? 4104 */ 4105 if (strchr(*av, '[')) 4106 (*av)++; 4107 4108 /* 4109 * locate the address-port separator (':' or ',') 4110 */ 4111 s = strchr(*av, ','); 4112 if (s == NULL) { 4113 s = strchr(*av, ']'); 4114 /* Prevent erroneous parsing on brackets. */ 4115 if (s != NULL) 4116 *(s++) = '\0'; 4117 else 4118 s = *av; 4119 4120 /* Distinguish between IPv4:port and IPv6 cases. */ 4121 s = strchr(s, ':'); 4122 if (s && strchr(s+1, ':')) 4123 s = NULL; /* no port */ 4124 } 4125 4126 if (s != NULL) { 4127 /* Terminate host portion and set s to start of port. */ 4128 *(s++) = '\0'; 4129 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 4130 if (s == end) 4131 errx(EX_DATAERR, 4132 "illegal forwarding port ``%s''", s); 4133 port_number = (u_short)i; 4134 } 4135 4136 /* 4137 * Resolve the host name or address to a family and a 4138 * network representation of the address. 4139 */ 4140 if (getaddrinfo(*av, NULL, NULL, &res)) 4141 errx(EX_DATAERR, NULL); 4142 /* Just use the first host in the answer. */ 4143 family = res->ai_family; 4144 memcpy(&result, res->ai_addr, res->ai_addrlen); 4145 freeaddrinfo(res); 4146 4147 if (family == PF_INET) { 4148 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 4149 4150 action->opcode = O_FORWARD_IP; 4151 action->len = F_INSN_SIZE(ipfw_insn_sa); 4152 CHECK_ACTLEN; 4153 4154 /* 4155 * In the kernel we assume AF_INET and use only 4156 * sin_port and sin_addr. Remember to set sin_len as 4157 * the routing code seems to use it too. 4158 */ 4159 p->sa.sin_len = sizeof(struct sockaddr_in); 4160 p->sa.sin_family = AF_INET; 4161 p->sa.sin_port = port_number; 4162 p->sa.sin_addr.s_addr = 4163 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 4164 } else if (family == PF_INET6) { 4165 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 4166 4167 action->opcode = O_FORWARD_IP6; 4168 action->len = F_INSN_SIZE(ipfw_insn_sa6); 4169 CHECK_ACTLEN; 4170 4171 p->sa.sin6_len = sizeof(struct sockaddr_in6); 4172 p->sa.sin6_family = AF_INET6; 4173 p->sa.sin6_port = port_number; 4174 p->sa.sin6_flowinfo = 0; 4175 p->sa.sin6_scope_id = 4176 ((struct sockaddr_in6 *)&result)->sin6_scope_id; 4177 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 4178 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 4179 } else { 4180 errx(EX_DATAERR, "Invalid address family in forward action"); 4181 } 4182 av++; 4183 break; 4184 } 4185 case TOK_COMMENT: 4186 /* pretend it is a 'count' rule followed by the comment */ 4187 action->opcode = O_COUNT; 4188 av--; /* go back... */ 4189 break; 4190 4191 case TOK_SETFIB: 4192 { 4193 int numfibs; 4194 size_t intsize = sizeof(int); 4195 4196 action->opcode = O_SETFIB; 4197 NEED1("missing fib number"); 4198 if (_substrcmp(*av, "tablearg") == 0) { 4199 action->arg1 = IP_FW_TARG; 4200 } else { 4201 action->arg1 = strtoul(*av, NULL, 10); 4202 if (sysctlbyname("net.fibs", &numfibs, &intsize, 4203 NULL, 0) == -1) 4204 errx(EX_DATAERR, "fibs not supported.\n"); 4205 if (action->arg1 >= numfibs) /* Temporary */ 4206 errx(EX_DATAERR, "fib too large.\n"); 4207 /* Add high-order bit to fib to make room for tablearg*/ 4208 action->arg1 |= 0x8000; 4209 } 4210 av++; 4211 break; 4212 } 4213 4214 case TOK_SETDSCP: 4215 { 4216 int code; 4217 4218 action->opcode = O_SETDSCP; 4219 NEED1("missing DSCP code"); 4220 if (_substrcmp(*av, "tablearg") == 0) { 4221 action->arg1 = IP_FW_TARG; 4222 } else { 4223 if (isalpha(*av[0])) { 4224 if ((code = match_token(f_ipdscp, *av)) == -1) 4225 errx(EX_DATAERR, "Unknown DSCP code"); 4226 action->arg1 = code; 4227 } else 4228 action->arg1 = strtoul(*av, NULL, 10); 4229 /* 4230 * Add high-order bit to DSCP to make room 4231 * for tablearg 4232 */ 4233 action->arg1 |= 0x8000; 4234 } 4235 av++; 4236 break; 4237 } 4238 4239 case TOK_REASS: 4240 action->opcode = O_REASS; 4241 break; 4242 4243 case TOK_RETURN: 4244 fill_cmd(action, O_CALLRETURN, F_NOT, 0); 4245 break; 4246 4247 case TOK_TCPSETMSS: { 4248 u_long mss; 4249 uint16_t idx; 4250 4251 idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION); 4252 if (idx == 0) 4253 errx(EX_DATAERR, "pack_object failed"); 4254 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4255 NEED1("Missing MSS value"); 4256 action = next_cmd(action, &ablen); 4257 action->len = 1; 4258 CHECK_ACTLEN; 4259 mss = strtoul(*av, NULL, 10); 4260 if (mss == 0 || mss > UINT16_MAX) 4261 errx(EX_USAGE, "invalid MSS value %s", *av); 4262 fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss); 4263 av++; 4264 break; 4265 } 4266 4267 default: 4268 av--; 4269 if (match_token(rule_eactions, *av) == -1) 4270 errx(EX_DATAERR, "invalid action %s\n", *av); 4271 /* 4272 * External actions support. 4273 * XXX: we support only syntax with instance name. 4274 * For known external actions (from rule_eactions list) 4275 * we can handle syntax directly. But with `eaction' 4276 * keyword we can use only `eaction <name> <instance>' 4277 * syntax. 4278 */ 4279 case TOK_EACTION: { 4280 uint16_t idx; 4281 4282 NEED1("Missing eaction name"); 4283 if (eaction_check_name(*av) != 0) 4284 errx(EX_DATAERR, "Invalid eaction name %s", *av); 4285 idx = pack_object(tstate, *av, IPFW_TLV_EACTION); 4286 if (idx == 0) 4287 errx(EX_DATAERR, "pack_object failed"); 4288 fill_cmd(action, O_EXTERNAL_ACTION, 0, idx); 4289 av++; 4290 NEED1("Missing eaction instance name"); 4291 action = next_cmd(action, &ablen); 4292 action->len = 1; 4293 CHECK_ACTLEN; 4294 if (eaction_check_name(*av) != 0) 4295 errx(EX_DATAERR, "Invalid eaction instance name %s", 4296 *av); 4297 /* 4298 * External action instance object has TLV type depended 4299 * from the external action name object index. Since we 4300 * currently don't know this index, use zero as TLV type. 4301 */ 4302 idx = pack_object(tstate, *av, 0); 4303 if (idx == 0) 4304 errx(EX_DATAERR, "pack_object failed"); 4305 fill_cmd(action, O_EXTERNAL_INSTANCE, 0, idx); 4306 av++; 4307 } 4308 } 4309 action = next_cmd(action, &ablen); 4310 4311 /* 4312 * [altq queuename] -- altq tag, optional 4313 * [log [logamount N]] -- log, optional 4314 * 4315 * If they exist, it go first in the cmdbuf, but then it is 4316 * skipped in the copy section to the end of the buffer. 4317 */ 4318 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 4319 av++; 4320 switch (i) { 4321 case TOK_LOG: 4322 { 4323 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 4324 int l; 4325 4326 if (have_log) 4327 errx(EX_DATAERR, 4328 "log cannot be specified more than once"); 4329 have_log = (ipfw_insn *)c; 4330 cmd->len = F_INSN_SIZE(ipfw_insn_log); 4331 CHECK_CMDLEN; 4332 cmd->opcode = O_LOG; 4333 if (av[0] && _substrcmp(*av, "logamount") == 0) { 4334 av++; 4335 NEED1("logamount requires argument"); 4336 l = atoi(*av); 4337 if (l < 0) 4338 errx(EX_DATAERR, 4339 "logamount must be positive"); 4340 c->max_log = l; 4341 av++; 4342 } else { 4343 len = sizeof(c->max_log); 4344 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 4345 &c->max_log, &len, NULL, 0) == -1) { 4346 if (g_co.test_only) { 4347 c->max_log = 0; 4348 break; 4349 } 4350 errx(1, "sysctlbyname(\"%s\")", 4351 "net.inet.ip.fw.verbose_limit"); 4352 } 4353 } 4354 } 4355 break; 4356 4357 #ifndef NO_ALTQ 4358 case TOK_ALTQ: 4359 { 4360 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 4361 4362 NEED1("missing altq queue name"); 4363 if (have_altq) 4364 errx(EX_DATAERR, 4365 "altq cannot be specified more than once"); 4366 have_altq = (ipfw_insn *)a; 4367 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 4368 CHECK_CMDLEN; 4369 cmd->opcode = O_ALTQ; 4370 a->qid = altq_name_to_qid(*av); 4371 av++; 4372 } 4373 break; 4374 #endif 4375 4376 case TOK_TAG: 4377 case TOK_UNTAG: { 4378 uint16_t tag; 4379 4380 if (have_tag) 4381 errx(EX_USAGE, "tag and untag cannot be " 4382 "specified more than once"); 4383 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 4384 rule_action_params); 4385 have_tag = cmd; 4386 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 4387 av++; 4388 break; 4389 } 4390 4391 default: 4392 abort(); 4393 } 4394 cmd = next_cmd(cmd, &cblen); 4395 } 4396 4397 if (have_state) { /* must be a check-state, we are done */ 4398 if (*av != NULL && 4399 match_token(rule_options, *av) == TOK_COMMENT) { 4400 /* check-state has a comment */ 4401 av++; 4402 fill_comment(cmd, av, cblen); 4403 cmd = next_cmd(cmd, &cblen); 4404 av[0] = NULL; 4405 } 4406 goto done; 4407 } 4408 4409 #define OR_START(target) \ 4410 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 4411 if (open_par) \ 4412 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 4413 prev = NULL; \ 4414 open_par = 1; \ 4415 if ( (av[0])[1] == '\0') { \ 4416 av++; \ 4417 } else \ 4418 (*av)++; \ 4419 } \ 4420 target: \ 4421 4422 4423 #define CLOSE_PAR \ 4424 if (open_par) { \ 4425 if (av[0] && ( \ 4426 strcmp(*av, ")") == 0 || \ 4427 strcmp(*av, "}") == 0)) { \ 4428 prev = NULL; \ 4429 open_par = 0; \ 4430 av++; \ 4431 } else \ 4432 errx(EX_USAGE, "missing \")\"\n"); \ 4433 } 4434 4435 #define NOT_BLOCK \ 4436 if (av[0] && _substrcmp(*av, "not") == 0) { \ 4437 if (cmd->len & F_NOT) \ 4438 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 4439 cmd->len |= F_NOT; \ 4440 av++; \ 4441 } 4442 4443 #define OR_BLOCK(target) \ 4444 if (av[0] && _substrcmp(*av, "or") == 0) { \ 4445 if (prev == NULL || open_par == 0) \ 4446 errx(EX_DATAERR, "invalid OR block"); \ 4447 prev->len |= F_OR; \ 4448 av++; \ 4449 goto target; \ 4450 } \ 4451 CLOSE_PAR; 4452 4453 first_cmd = cmd; 4454 4455 #if 0 4456 /* 4457 * MAC addresses, optional. 4458 * If we have this, we skip the part "proto from src to dst" 4459 * and jump straight to the option parsing. 4460 */ 4461 NOT_BLOCK; 4462 NEED1("missing protocol"); 4463 if (_substrcmp(*av, "MAC") == 0 || 4464 _substrcmp(*av, "mac") == 0) { 4465 av++; /* the "MAC" keyword */ 4466 add_mac(cmd, av); /* exits in case of errors */ 4467 cmd = next_cmd(cmd); 4468 av += 2; /* dst-mac and src-mac */ 4469 NOT_BLOCK; 4470 NEED1("missing mac type"); 4471 if (add_mactype(cmd, av[0])) 4472 cmd = next_cmd(cmd); 4473 av++; /* any or mac-type */ 4474 goto read_options; 4475 } 4476 #endif 4477 4478 /* 4479 * protocol, mandatory 4480 */ 4481 OR_START(get_proto); 4482 NOT_BLOCK; 4483 NEED1("missing protocol"); 4484 if (add_proto_compat(cmd, *av, &proto)) { 4485 av++; 4486 if (F_LEN(cmd) != 0) { 4487 prev = cmd; 4488 cmd = next_cmd(cmd, &cblen); 4489 } 4490 } else if (first_cmd != cmd) { 4491 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 4492 } else { 4493 rule->flags |= IPFW_RULE_JUSTOPTS; 4494 goto read_options; 4495 } 4496 OR_BLOCK(get_proto); 4497 4498 first_cmd = cmd; /* update pointer to use in compact form */ 4499 4500 /* 4501 * "from", mandatory 4502 */ 4503 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 4504 errx(EX_USAGE, "missing ``from''"); 4505 av++; 4506 4507 /* 4508 * source IP, mandatory 4509 */ 4510 OR_START(source_ip); 4511 NOT_BLOCK; /* optional "not" */ 4512 NEED1("missing source address"); 4513 if (add_src(cmd, *av, proto, cblen, tstate)) { 4514 av++; 4515 if (F_LEN(cmd) != 0) { /* ! any */ 4516 prev = cmd; 4517 cmd = next_cmd(cmd, &cblen); 4518 } 4519 } else 4520 errx(EX_USAGE, "bad source address %s", *av); 4521 OR_BLOCK(source_ip); 4522 4523 /* 4524 * source ports, optional 4525 */ 4526 NOT_BLOCK; /* optional "not" */ 4527 if ( av[0] != NULL ) { 4528 if (_substrcmp(*av, "any") == 0 || 4529 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4530 av++; 4531 if (F_LEN(cmd) != 0) 4532 cmd = next_cmd(cmd, &cblen); 4533 } 4534 } 4535 4536 /* 4537 * "to", mandatory 4538 */ 4539 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4540 errx(EX_USAGE, "missing ``to''"); 4541 av++; 4542 4543 /* 4544 * destination, mandatory 4545 */ 4546 OR_START(dest_ip); 4547 NOT_BLOCK; /* optional "not" */ 4548 NEED1("missing dst address"); 4549 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4550 av++; 4551 if (F_LEN(cmd) != 0) { /* ! any */ 4552 prev = cmd; 4553 cmd = next_cmd(cmd, &cblen); 4554 } 4555 } else 4556 errx( EX_USAGE, "bad destination address %s", *av); 4557 OR_BLOCK(dest_ip); 4558 4559 /* 4560 * dest. ports, optional 4561 */ 4562 NOT_BLOCK; /* optional "not" */ 4563 if (av[0]) { 4564 if (_substrcmp(*av, "any") == 0 || 4565 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4566 av++; 4567 if (F_LEN(cmd) != 0) 4568 cmd = next_cmd(cmd, &cblen); 4569 } 4570 } 4571 if (first_cmd == cmd) 4572 rule->flags |= IPFW_RULE_NOOPT; 4573 4574 read_options: 4575 prev = NULL; 4576 while ( av[0] != NULL ) { 4577 char *s; 4578 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4579 4580 s = *av; 4581 cmd32 = (ipfw_insn_u32 *)cmd; 4582 4583 if (*s == '!') { /* alternate syntax for NOT */ 4584 if (cmd->len & F_NOT) 4585 errx(EX_USAGE, "double \"not\" not allowed\n"); 4586 cmd->len = F_NOT; 4587 s++; 4588 } 4589 i = match_token(rule_options, s); 4590 av++; 4591 switch(i) { 4592 case TOK_NOT: 4593 if (cmd->len & F_NOT) 4594 errx(EX_USAGE, "double \"not\" not allowed\n"); 4595 cmd->len = F_NOT; 4596 break; 4597 4598 case TOK_OR: 4599 if (open_par == 0 || prev == NULL) 4600 errx(EX_USAGE, "invalid \"or\" block\n"); 4601 prev->len |= F_OR; 4602 break; 4603 4604 case TOK_STARTBRACE: 4605 if (open_par) 4606 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4607 open_par = 1; 4608 break; 4609 4610 case TOK_ENDBRACE: 4611 if (!open_par) 4612 errx(EX_USAGE, "+missing \")\"\n"); 4613 open_par = 0; 4614 prev = NULL; 4615 break; 4616 4617 case TOK_IN: 4618 fill_cmd(cmd, O_IN, 0, 0); 4619 break; 4620 4621 case TOK_OUT: 4622 cmd->len ^= F_NOT; /* toggle F_NOT */ 4623 fill_cmd(cmd, O_IN, 0, 0); 4624 break; 4625 4626 case TOK_DIVERTED: 4627 fill_cmd(cmd, O_DIVERTED, 0, 3); 4628 break; 4629 4630 case TOK_DIVERTEDLOOPBACK: 4631 fill_cmd(cmd, O_DIVERTED, 0, 1); 4632 break; 4633 4634 case TOK_DIVERTEDOUTPUT: 4635 fill_cmd(cmd, O_DIVERTED, 0, 2); 4636 break; 4637 4638 case TOK_FRAG: { 4639 uint32_t set = 0, clear = 0; 4640 4641 if (*av != NULL && fill_flags(f_ipoff, *av, NULL, 4642 &set, &clear) == 0) 4643 av++; 4644 else { 4645 /* 4646 * Compatibility: no argument after "frag" 4647 * keyword equals to "frag offset". 4648 */ 4649 set = 0x01; 4650 clear = 0; 4651 } 4652 fill_cmd(cmd, O_FRAG, 0, 4653 (set & 0xff) | ( (clear & 0xff) << 8)); 4654 break; 4655 } 4656 4657 case TOK_LAYER2: 4658 fill_cmd(cmd, O_LAYER2, 0, 0); 4659 break; 4660 4661 case TOK_XMIT: 4662 case TOK_RECV: 4663 case TOK_VIA: 4664 NEED1("recv, xmit, via require interface name" 4665 " or address"); 4666 fill_iface((ipfw_insn_if *)cmd, av[0], cblen, tstate); 4667 av++; 4668 if (F_LEN(cmd) == 0) /* not a valid address */ 4669 break; 4670 if (i == TOK_XMIT) 4671 cmd->opcode = O_XMIT; 4672 else if (i == TOK_RECV) 4673 cmd->opcode = O_RECV; 4674 else if (i == TOK_VIA) 4675 cmd->opcode = O_VIA; 4676 break; 4677 4678 case TOK_ICMPTYPES: 4679 NEED1("icmptypes requires list of types"); 4680 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 4681 av++; 4682 break; 4683 4684 case TOK_ICMP6TYPES: 4685 NEED1("icmptypes requires list of types"); 4686 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 4687 av++; 4688 break; 4689 4690 case TOK_IPTTL: 4691 NEED1("ipttl requires TTL"); 4692 if (strpbrk(*av, "-,")) { 4693 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 4694 errx(EX_DATAERR, "invalid ipttl %s", *av); 4695 } else 4696 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 4697 av++; 4698 break; 4699 4700 case TOK_IPID: 4701 NEED1("ipid requires id"); 4702 if (strpbrk(*av, "-,")) { 4703 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 4704 errx(EX_DATAERR, "invalid ipid %s", *av); 4705 } else 4706 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 4707 av++; 4708 break; 4709 4710 case TOK_IPLEN: 4711 NEED1("iplen requires length"); 4712 if (strpbrk(*av, "-,")) { 4713 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 4714 errx(EX_DATAERR, "invalid ip len %s", *av); 4715 } else 4716 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 4717 av++; 4718 break; 4719 4720 case TOK_IPVER: 4721 NEED1("ipver requires version"); 4722 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 4723 av++; 4724 break; 4725 4726 case TOK_IPPRECEDENCE: 4727 NEED1("ipprecedence requires value"); 4728 fill_cmd(cmd, O_IPPRECEDENCE, 0, 4729 (strtoul(*av, NULL, 0) & 7) << 5); 4730 av++; 4731 break; 4732 4733 case TOK_DSCP: 4734 NEED1("missing DSCP code"); 4735 fill_dscp(cmd, *av, cblen); 4736 av++; 4737 break; 4738 4739 case TOK_IPOPTS: 4740 NEED1("missing argument for ipoptions"); 4741 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 4742 av++; 4743 break; 4744 4745 case TOK_IPTOS: 4746 NEED1("missing argument for iptos"); 4747 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 4748 av++; 4749 break; 4750 4751 case TOK_UID: 4752 NEED1("uid requires argument"); 4753 { 4754 char *end; 4755 uid_t uid; 4756 struct passwd *pwd; 4757 4758 cmd->opcode = O_UID; 4759 uid = strtoul(*av, &end, 0); 4760 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 4761 if (pwd == NULL) 4762 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 4763 cmd32->d[0] = pwd->pw_uid; 4764 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4765 av++; 4766 } 4767 break; 4768 4769 case TOK_GID: 4770 NEED1("gid requires argument"); 4771 { 4772 char *end; 4773 gid_t gid; 4774 struct group *grp; 4775 4776 cmd->opcode = O_GID; 4777 gid = strtoul(*av, &end, 0); 4778 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 4779 if (grp == NULL) 4780 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 4781 cmd32->d[0] = grp->gr_gid; 4782 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4783 av++; 4784 } 4785 break; 4786 4787 case TOK_JAIL: 4788 NEED1("jail requires argument"); 4789 { 4790 char *end; 4791 int jid; 4792 4793 cmd->opcode = O_JAIL; 4794 /* 4795 * If av is a number, then we'll just pass it as-is. If 4796 * it's a name, try to resolve that to a jid. 4797 * 4798 * We save the jail_getid(3) call for a fallback because 4799 * it entails an unconditional trip to the kernel to 4800 * either validate a jid or resolve a name to a jid. 4801 * This specific token doesn't currently require a 4802 * jid to be an active jail, so we save a transition 4803 * by simply using a number that we're given. 4804 */ 4805 jid = strtoul(*av, &end, 10); 4806 if (*end != '\0') { 4807 jid = jail_getid(*av); 4808 if (jid < 0) 4809 errx(EX_DATAERR, "%s", jail_errmsg); 4810 } 4811 cmd32->d[0] = (uint32_t)jid; 4812 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 4813 av++; 4814 } 4815 break; 4816 4817 case TOK_ESTAB: 4818 fill_cmd(cmd, O_ESTAB, 0, 0); 4819 break; 4820 4821 case TOK_SETUP: 4822 fill_cmd(cmd, O_TCPFLAGS, 0, 4823 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 4824 break; 4825 4826 case TOK_TCPDATALEN: 4827 NEED1("tcpdatalen requires length"); 4828 if (strpbrk(*av, "-,")) { 4829 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 4830 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 4831 } else 4832 fill_cmd(cmd, O_TCPDATALEN, 0, 4833 strtoul(*av, NULL, 0)); 4834 av++; 4835 break; 4836 4837 case TOK_TCPOPTS: 4838 NEED1("missing argument for tcpoptions"); 4839 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 4840 av++; 4841 break; 4842 4843 case TOK_TCPSEQ: 4844 case TOK_TCPACK: 4845 NEED1("tcpseq/tcpack requires argument"); 4846 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 4847 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 4848 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 4849 av++; 4850 break; 4851 4852 case TOK_TCPMSS: 4853 case TOK_TCPWIN: 4854 NEED1("tcpmss/tcpwin requires size"); 4855 if (strpbrk(*av, "-,")) { 4856 if (add_ports(cmd, *av, 0, 4857 i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS, 4858 cblen) == NULL) 4859 errx(EX_DATAERR, "invalid %s size %s", 4860 s, *av); 4861 } else 4862 fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN : 4863 O_TCPMSS, 0, strtoul(*av, NULL, 0)); 4864 av++; 4865 break; 4866 4867 case TOK_TCPFLAGS: 4868 NEED1("missing argument for tcpflags"); 4869 cmd->opcode = O_TCPFLAGS; 4870 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 4871 av++; 4872 break; 4873 4874 case TOK_KEEPSTATE: 4875 case TOK_RECORDSTATE: { 4876 uint16_t uidx; 4877 4878 if (open_par) 4879 errx(EX_USAGE, "keep-state or record-state cannot be part " 4880 "of an or block"); 4881 if (have_state) 4882 errx(EX_USAGE, "only one of keep-state, record-state, " 4883 " limit and set-limit is allowed"); 4884 if (*av != NULL && *av[0] == ':') { 4885 if (state_check_name(*av + 1) != 0) 4886 errx(EX_DATAERR, 4887 "Invalid state name %s", *av); 4888 uidx = pack_object(tstate, *av + 1, 4889 IPFW_TLV_STATE_NAME); 4890 av++; 4891 } else 4892 uidx = pack_object(tstate, default_state_name, 4893 IPFW_TLV_STATE_NAME); 4894 have_state = cmd; 4895 have_rstate = i == TOK_RECORDSTATE; 4896 fill_cmd(cmd, O_KEEP_STATE, 0, uidx); 4897 break; 4898 } 4899 4900 case TOK_LIMIT: 4901 case TOK_SETLIMIT: { 4902 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 4903 int val; 4904 4905 if (open_par) 4906 errx(EX_USAGE, 4907 "limit or set-limit cannot be part of an or block"); 4908 if (have_state) 4909 errx(EX_USAGE, "only one of keep-state, record-state, " 4910 " limit and set-limit is allowed"); 4911 have_state = cmd; 4912 have_rstate = i == TOK_SETLIMIT; 4913 4914 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 4915 CHECK_CMDLEN; 4916 cmd->opcode = O_LIMIT; 4917 c->limit_mask = c->conn_limit = 0; 4918 4919 while ( av[0] != NULL ) { 4920 if ((val = match_token(limit_masks, *av)) <= 0) 4921 break; 4922 c->limit_mask |= val; 4923 av++; 4924 } 4925 4926 if (c->limit_mask == 0) 4927 errx(EX_USAGE, "limit: missing limit mask"); 4928 4929 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 4930 TOK_LIMIT, rule_options); 4931 av++; 4932 4933 if (*av != NULL && *av[0] == ':') { 4934 if (state_check_name(*av + 1) != 0) 4935 errx(EX_DATAERR, 4936 "Invalid state name %s", *av); 4937 cmd->arg1 = pack_object(tstate, *av + 1, 4938 IPFW_TLV_STATE_NAME); 4939 av++; 4940 } else 4941 cmd->arg1 = pack_object(tstate, 4942 default_state_name, IPFW_TLV_STATE_NAME); 4943 break; 4944 } 4945 4946 case TOK_PROTO: 4947 NEED1("missing protocol"); 4948 if (add_proto(cmd, *av, &proto)) { 4949 av++; 4950 } else 4951 errx(EX_DATAERR, "invalid protocol ``%s''", 4952 *av); 4953 break; 4954 4955 case TOK_SRCIP: 4956 NEED1("missing source IP"); 4957 if (add_srcip(cmd, *av, cblen, tstate)) { 4958 av++; 4959 } 4960 break; 4961 4962 case TOK_DSTIP: 4963 NEED1("missing destination IP"); 4964 if (add_dstip(cmd, *av, cblen, tstate)) { 4965 av++; 4966 } 4967 break; 4968 4969 case TOK_SRCIP6: 4970 NEED1("missing source IP6"); 4971 if (add_srcip6(cmd, *av, cblen, tstate)) { 4972 av++; 4973 } 4974 break; 4975 4976 case TOK_DSTIP6: 4977 NEED1("missing destination IP6"); 4978 if (add_dstip6(cmd, *av, cblen, tstate)) { 4979 av++; 4980 } 4981 break; 4982 4983 4984 case TOK_SRCMAC: 4985 NEED1("missing source MAC"); 4986 if (add_srcmac(cmd, *av, tstate)) { 4987 av++; 4988 } 4989 break; 4990 4991 case TOK_DSTMAC: 4992 NEED1("missing destination MAC"); 4993 if (add_dstmac(cmd, *av, tstate)) { 4994 av++; 4995 } 4996 break; 4997 4998 case TOK_SRCPORT: 4999 NEED1("missing source port"); 5000 if (_substrcmp(*av, "any") == 0 || 5001 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 5002 av++; 5003 } else 5004 errx(EX_DATAERR, "invalid source port %s", *av); 5005 break; 5006 5007 case TOK_DSTPORT: 5008 NEED1("missing destination port"); 5009 if (_substrcmp(*av, "any") == 0 || 5010 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 5011 av++; 5012 } else 5013 errx(EX_DATAERR, "invalid destination port %s", 5014 *av); 5015 break; 5016 5017 case TOK_MAC: 5018 if (add_mac(cmd, av, cblen)) 5019 av += 2; 5020 break; 5021 5022 case TOK_MACTYPE: 5023 NEED1("missing mac type"); 5024 if (!add_mactype(cmd, *av, cblen)) 5025 errx(EX_DATAERR, "invalid mac type %s", *av); 5026 av++; 5027 break; 5028 5029 case TOK_VERREVPATH: 5030 fill_cmd(cmd, O_VERREVPATH, 0, 0); 5031 break; 5032 5033 case TOK_VERSRCREACH: 5034 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 5035 break; 5036 5037 case TOK_ANTISPOOF: 5038 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 5039 break; 5040 5041 case TOK_IPSEC: 5042 fill_cmd(cmd, O_IPSEC, 0, 0); 5043 break; 5044 5045 case TOK_IPV6: 5046 fill_cmd(cmd, O_IP6, 0, 0); 5047 break; 5048 5049 case TOK_IPV4: 5050 fill_cmd(cmd, O_IP4, 0, 0); 5051 break; 5052 5053 case TOK_EXT6HDR: 5054 NEED1("missing extension header"); 5055 fill_ext6hdr( cmd, *av ); 5056 av++; 5057 break; 5058 5059 case TOK_FLOWID: 5060 if (proto != IPPROTO_IPV6 ) 5061 errx( EX_USAGE, "flow-id filter is active " 5062 "only for ipv6 protocol\n"); 5063 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 5064 av++; 5065 break; 5066 5067 case TOK_COMMENT: 5068 fill_comment(cmd, av, cblen); 5069 av[0]=NULL; 5070 break; 5071 5072 case TOK_TAGGED: 5073 if (av[0] && strpbrk(*av, "-,")) { 5074 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 5075 errx(EX_DATAERR, "tagged: invalid tag" 5076 " list: %s", *av); 5077 } 5078 else { 5079 uint16_t tag; 5080 5081 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 5082 TOK_TAGGED, rule_options); 5083 fill_cmd(cmd, O_TAGGED, 0, tag); 5084 } 5085 av++; 5086 break; 5087 5088 case TOK_FIB: 5089 NEED1("fib requires fib number"); 5090 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 5091 av++; 5092 break; 5093 case TOK_SOCKARG: 5094 fill_cmd(cmd, O_SOCKARG, 0, 0); 5095 break; 5096 5097 case TOK_LOOKUP: { 5098 ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; 5099 5100 if (!av[0] || !av[1]) 5101 errx(EX_USAGE, "format: lookup argument tablenum"); 5102 cmd->opcode = O_IP_DST_LOOKUP; 5103 cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; 5104 i = match_token(lookup_keys, *av); 5105 if (i == -1) 5106 errx(EX_USAGE, "format: cannot lookup on %s", *av); 5107 __PAST_END(c->d, 1) = i; 5108 av++; 5109 5110 if ((i = pack_table(tstate, *av)) == 0) 5111 errx(EX_DATAERR, "Invalid table name: %s", *av); 5112 5113 cmd->arg1 = i; 5114 av++; 5115 } 5116 break; 5117 case TOK_FLOW: 5118 NEED1("missing table name"); 5119 if (strncmp(*av, "table(", 6) != 0) 5120 errx(EX_DATAERR, 5121 "enclose table name into \"table()\""); 5122 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 5123 av++; 5124 break; 5125 5126 case TOK_SKIPACTION: 5127 if (have_skipcmd) 5128 errx(EX_USAGE, "only one defer-action " 5129 "is allowed"); 5130 have_skipcmd = cmd; 5131 fill_cmd(cmd, O_SKIP_ACTION, 0, 0); 5132 break; 5133 5134 default: 5135 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 5136 } 5137 if (F_LEN(cmd) > 0) { /* prepare to advance */ 5138 prev = cmd; 5139 cmd = next_cmd(cmd, &cblen); 5140 } 5141 } 5142 5143 done: 5144 5145 if (!have_state && have_skipcmd) 5146 warnx("Rule contains \"defer-immediate-action\" " 5147 "and doesn't contain any state-related options."); 5148 5149 /* 5150 * Now copy stuff into the rule. 5151 * If we have a keep-state option, the first instruction 5152 * must be a PROBE_STATE (which is generated here). 5153 * If we have a LOG option, it was stored as the first command, 5154 * and now must be moved to the top of the action part. 5155 */ 5156 dst = (ipfw_insn *)rule->cmd; 5157 5158 /* 5159 * First thing to write into the command stream is the match probability. 5160 */ 5161 if (match_prob != 1) { /* 1 means always match */ 5162 dst->opcode = O_PROB; 5163 dst->len = 2; 5164 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 5165 dst += dst->len; 5166 } 5167 5168 /* 5169 * generate O_PROBE_STATE if necessary 5170 */ 5171 if (have_state && have_state->opcode != O_CHECK_STATE && !have_rstate) { 5172 fill_cmd(dst, O_PROBE_STATE, 0, have_state->arg1); 5173 dst = next_cmd(dst, &rblen); 5174 } 5175 5176 /* 5177 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG, 5178 * O_SKIP_ACTION 5179 */ 5180 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 5181 i = F_LEN(src); 5182 CHECK_RBUFLEN(i); 5183 5184 switch (src->opcode) { 5185 case O_LOG: 5186 case O_KEEP_STATE: 5187 case O_LIMIT: 5188 case O_ALTQ: 5189 case O_TAG: 5190 case O_SKIP_ACTION: 5191 break; 5192 default: 5193 bcopy(src, dst, i * sizeof(uint32_t)); 5194 dst += i; 5195 } 5196 } 5197 5198 /* 5199 * put back the have_state command as last opcode 5200 */ 5201 if (have_state && have_state->opcode != O_CHECK_STATE) { 5202 i = F_LEN(have_state); 5203 CHECK_RBUFLEN(i); 5204 bcopy(have_state, dst, i * sizeof(uint32_t)); 5205 dst += i; 5206 } 5207 5208 /* 5209 * put back the have_skipcmd command as very last opcode 5210 */ 5211 if (have_skipcmd) { 5212 i = F_LEN(have_skipcmd); 5213 CHECK_RBUFLEN(i); 5214 bcopy(have_skipcmd, dst, i * sizeof(uint32_t)); 5215 dst += i; 5216 } 5217 5218 /* 5219 * start action section 5220 */ 5221 rule->act_ofs = dst - rule->cmd; 5222 5223 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 5224 if (have_log) { 5225 i = F_LEN(have_log); 5226 CHECK_RBUFLEN(i); 5227 bcopy(have_log, dst, i * sizeof(uint32_t)); 5228 dst += i; 5229 } 5230 if (have_altq) { 5231 i = F_LEN(have_altq); 5232 CHECK_RBUFLEN(i); 5233 bcopy(have_altq, dst, i * sizeof(uint32_t)); 5234 dst += i; 5235 } 5236 if (have_tag) { 5237 i = F_LEN(have_tag); 5238 CHECK_RBUFLEN(i); 5239 bcopy(have_tag, dst, i * sizeof(uint32_t)); 5240 dst += i; 5241 } 5242 5243 /* 5244 * copy all other actions 5245 */ 5246 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 5247 i = F_LEN(src); 5248 CHECK_RBUFLEN(i); 5249 bcopy(src, dst, i * sizeof(uint32_t)); 5250 dst += i; 5251 } 5252 5253 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 5254 *rbufsize = (char *)dst - (char *)rule; 5255 } 5256 5257 static int 5258 compare_ntlv(const void *_a, const void *_b) 5259 { 5260 const ipfw_obj_ntlv *a, *b; 5261 5262 a = (const ipfw_obj_ntlv *)_a; 5263 b = (const ipfw_obj_ntlv *)_b; 5264 5265 if (a->set < b->set) 5266 return (-1); 5267 else if (a->set > b->set) 5268 return (1); 5269 5270 if (a->idx < b->idx) 5271 return (-1); 5272 else if (a->idx > b->idx) 5273 return (1); 5274 5275 if (a->head.type < b->head.type) 5276 return (-1); 5277 else if (a->head.type > b->head.type) 5278 return (1); 5279 5280 return (0); 5281 } 5282 5283 /* 5284 * Provide kernel with sorted list of referenced objects 5285 */ 5286 static void 5287 object_sort_ctlv(ipfw_obj_ctlv *ctlv) 5288 { 5289 5290 qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv); 5291 } 5292 5293 struct object_kt { 5294 uint16_t uidx; 5295 uint16_t type; 5296 }; 5297 static int 5298 compare_object_kntlv(const void *k, const void *v) 5299 { 5300 const ipfw_obj_ntlv *ntlv; 5301 struct object_kt key; 5302 5303 key = *((const struct object_kt *)k); 5304 ntlv = (const ipfw_obj_ntlv *)v; 5305 5306 if (key.uidx < ntlv->idx) 5307 return (-1); 5308 else if (key.uidx > ntlv->idx) 5309 return (1); 5310 5311 if (key.type < ntlv->head.type) 5312 return (-1); 5313 else if (key.type > ntlv->head.type) 5314 return (1); 5315 5316 return (0); 5317 } 5318 5319 /* 5320 * Finds object name in @ctlv by @idx and @type. 5321 * Uses the following facts: 5322 * 1) All TLVs are the same size 5323 * 2) Kernel implementation provides already sorted list. 5324 * 5325 * Returns table name or NULL. 5326 */ 5327 static char * 5328 object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, uint16_t type) 5329 { 5330 ipfw_obj_ntlv *ntlv; 5331 struct object_kt key; 5332 5333 key.uidx = idx; 5334 key.type = type; 5335 5336 ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize, 5337 compare_object_kntlv); 5338 5339 if (ntlv != NULL) 5340 return (ntlv->name); 5341 5342 return (NULL); 5343 } 5344 5345 static char * 5346 table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx) 5347 { 5348 5349 return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME)); 5350 } 5351 5352 /* 5353 * Adds one or more rules to ipfw chain. 5354 * Data layout: 5355 * Request: 5356 * [ 5357 * ip_fw3_opheader 5358 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 5359 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 5360 * ] 5361 * Reply: 5362 * [ 5363 * ip_fw3_opheader 5364 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 5365 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 5366 * ] 5367 * 5368 * Rules in reply are modified to store their actual ruleset number. 5369 * 5370 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 5371 * according to their idx field and there has to be no duplicates. 5372 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 5373 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 5374 */ 5375 void 5376 ipfw_add(char *av[]) 5377 { 5378 uint32_t rulebuf[1024]; 5379 int rbufsize, default_off, tlen, rlen; 5380 size_t sz; 5381 struct tidx ts; 5382 struct ip_fw_rule *rule; 5383 caddr_t tbuf; 5384 ip_fw3_opheader *op3; 5385 ipfw_obj_ctlv *ctlv, *tstate; 5386 5387 rbufsize = sizeof(rulebuf); 5388 memset(rulebuf, 0, rbufsize); 5389 memset(&ts, 0, sizeof(ts)); 5390 5391 /* Optimize case with no tables */ 5392 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 5393 op3 = (ip_fw3_opheader *)rulebuf; 5394 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5395 rule = (struct ip_fw_rule *)(ctlv + 1); 5396 rbufsize -= default_off; 5397 5398 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 5399 /* Align rule size to u64 boundary */ 5400 rlen = roundup2(rbufsize, sizeof(uint64_t)); 5401 5402 tbuf = NULL; 5403 sz = 0; 5404 tstate = NULL; 5405 if (ts.count != 0) { 5406 /* Some tables. We have to alloc more data */ 5407 tlen = ts.count * sizeof(ipfw_obj_ntlv); 5408 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 5409 5410 if ((tbuf = calloc(1, sz)) == NULL) 5411 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 5412 op3 = (ip_fw3_opheader *)tbuf; 5413 /* Tables first */ 5414 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5415 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 5416 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 5417 ctlv->count = ts.count; 5418 ctlv->objsize = sizeof(ipfw_obj_ntlv); 5419 memcpy(ctlv + 1, ts.idx, tlen); 5420 object_sort_ctlv(ctlv); 5421 tstate = ctlv; 5422 /* Rule next */ 5423 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 5424 ctlv->head.type = IPFW_TLV_RULE_LIST; 5425 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5426 ctlv->count = 1; 5427 memcpy(ctlv + 1, rule, rbufsize); 5428 } else { 5429 /* Simply add header */ 5430 sz = rlen + default_off; 5431 memset(ctlv, 0, sizeof(*ctlv)); 5432 ctlv->head.type = IPFW_TLV_RULE_LIST; 5433 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5434 ctlv->count = 1; 5435 } 5436 5437 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 5438 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 5439 5440 if (!g_co.do_quiet) { 5441 struct format_opts sfo; 5442 struct buf_pr bp; 5443 memset(&sfo, 0, sizeof(sfo)); 5444 sfo.tstate = tstate; 5445 sfo.set_mask = (uint32_t)(-1); 5446 bp_alloc(&bp, 4096); 5447 show_static_rule(&g_co, &sfo, &bp, rule, NULL); 5448 printf("%s", bp.buf); 5449 bp_free(&bp); 5450 } 5451 5452 if (tbuf != NULL) 5453 free(tbuf); 5454 5455 if (ts.idx != NULL) 5456 free(ts.idx); 5457 } 5458 5459 /* 5460 * clear the counters or the log counters. 5461 * optname has the following values: 5462 * 0 (zero both counters and logging) 5463 * 1 (zero logging only) 5464 */ 5465 void 5466 ipfw_zero(int ac, char *av[], int optname) 5467 { 5468 ipfw_range_tlv rt; 5469 char const *errstr; 5470 char const *name = optname ? "RESETLOG" : "ZERO"; 5471 uint32_t arg; 5472 int failed = EX_OK; 5473 5474 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 5475 av++; ac--; 5476 5477 if (ac == 0) { 5478 /* clear all entries */ 5479 memset(&rt, 0, sizeof(rt)); 5480 rt.flags = IPFW_RCFLAG_ALL; 5481 if (do_range_cmd(optname, &rt) < 0) 5482 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 5483 if (!g_co.do_quiet) 5484 printf("%s.\n", optname == IP_FW_XZERO ? 5485 "Accounting cleared":"Logging counts reset"); 5486 5487 return; 5488 } 5489 5490 while (ac) { 5491 /* Rule number */ 5492 if (isdigit(**av)) { 5493 arg = strtonum(*av, 0, 0xffff, &errstr); 5494 if (errstr) 5495 errx(EX_DATAERR, 5496 "invalid rule number %s\n", *av); 5497 memset(&rt, 0, sizeof(rt)); 5498 rt.start_rule = arg; 5499 rt.end_rule = arg; 5500 rt.flags |= IPFW_RCFLAG_RANGE; 5501 if (g_co.use_set != 0) { 5502 rt.set = g_co.use_set - 1; 5503 rt.flags |= IPFW_RCFLAG_SET; 5504 } 5505 if (do_range_cmd(optname, &rt) != 0) { 5506 warn("rule %u: setsockopt(IP_FW_X%s)", 5507 arg, name); 5508 failed = EX_UNAVAILABLE; 5509 } else if (rt.new_set == 0) { 5510 printf("Entry %d not found\n", arg); 5511 failed = EX_UNAVAILABLE; 5512 } else if (!g_co.do_quiet) 5513 printf("Entry %d %s.\n", arg, 5514 optname == IP_FW_XZERO ? 5515 "cleared" : "logging count reset"); 5516 } else { 5517 errx(EX_USAGE, "invalid rule number ``%s''", *av); 5518 } 5519 av++; ac--; 5520 } 5521 if (failed != EX_OK) 5522 exit(failed); 5523 } 5524 5525 void 5526 ipfw_flush(int force) 5527 { 5528 ipfw_range_tlv rt; 5529 5530 if (!force && !g_co.do_quiet) { /* need to ask user */ 5531 int c; 5532 5533 printf("Are you sure? [yn] "); 5534 fflush(stdout); 5535 do { 5536 c = toupper(getc(stdin)); 5537 while (c != '\n' && getc(stdin) != '\n') 5538 if (feof(stdin)) 5539 return; /* and do not flush */ 5540 } while (c != 'Y' && c != 'N'); 5541 printf("\n"); 5542 if (c == 'N') /* user said no */ 5543 return; 5544 } 5545 if (g_co.do_pipe) { 5546 dummynet_flush(); 5547 return; 5548 } 5549 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 5550 memset(&rt, 0, sizeof(rt)); 5551 if (g_co.use_set != 0) { 5552 rt.set = g_co.use_set - 1; 5553 rt.flags = IPFW_RCFLAG_SET; 5554 } else 5555 rt.flags = IPFW_RCFLAG_ALL; 5556 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 5557 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 5558 if (!g_co.do_quiet) 5559 printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules"); 5560 } 5561 5562 static struct _s_x intcmds[] = { 5563 { "talist", TOK_TALIST }, 5564 { "iflist", TOK_IFLIST }, 5565 { "olist", TOK_OLIST }, 5566 { "vlist", TOK_VLIST }, 5567 { NULL, 0 } 5568 }; 5569 5570 static struct _s_x otypes[] = { 5571 { "EACTION", IPFW_TLV_EACTION }, 5572 { "DYNSTATE", IPFW_TLV_STATE_NAME }, 5573 { NULL, 0 } 5574 }; 5575 5576 static const char* 5577 lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type) 5578 { 5579 const char *name; 5580 int i; 5581 5582 name = NULL; 5583 for (i = 0; i < cnt; i++) { 5584 if (ntlv[i].head.type != IPFW_TLV_EACTION) 5585 continue; 5586 if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type) 5587 continue; 5588 name = ntlv[i].name; 5589 break; 5590 } 5591 return (name); 5592 } 5593 5594 static void 5595 ipfw_list_objects(int ac __unused, char *av[] __unused) 5596 { 5597 ipfw_obj_lheader req, *olh; 5598 ipfw_obj_ntlv *ntlv; 5599 const char *name; 5600 size_t sz; 5601 uint32_t i; 5602 5603 memset(&req, 0, sizeof(req)); 5604 sz = sizeof(req); 5605 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0) 5606 if (errno != ENOMEM) 5607 return; 5608 5609 sz = req.size; 5610 if ((olh = calloc(1, sz)) == NULL) 5611 return; 5612 5613 olh->size = sz; 5614 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) { 5615 free(olh); 5616 return; 5617 } 5618 5619 if (olh->count > 0) 5620 printf("Objects list:\n"); 5621 else 5622 printf("There are no objects\n"); 5623 ntlv = (ipfw_obj_ntlv *)(olh + 1); 5624 for (i = 0; i < olh->count; i++) { 5625 name = match_value(otypes, ntlv->head.type); 5626 if (name == NULL) 5627 name = lookup_eaction_name( 5628 (ipfw_obj_ntlv *)(olh + 1), olh->count, 5629 ntlv->head.type); 5630 if (name == NULL) 5631 printf(" kidx: %4d\ttype: %10d\tname: %s\n", 5632 ntlv->idx, ntlv->head.type, ntlv->name); 5633 else 5634 printf(" kidx: %4d\ttype: %10s\tname: %s\n", 5635 ntlv->idx, name, ntlv->name); 5636 ntlv++; 5637 } 5638 free(olh); 5639 } 5640 5641 void 5642 ipfw_internal_handler(int ac, char *av[]) 5643 { 5644 int tcmd; 5645 5646 ac--; av++; 5647 NEED1("internal cmd required"); 5648 5649 if ((tcmd = match_token(intcmds, *av)) == -1) 5650 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 5651 5652 switch (tcmd) { 5653 case TOK_IFLIST: 5654 ipfw_list_tifaces(); 5655 break; 5656 case TOK_TALIST: 5657 ipfw_list_ta(ac, av); 5658 break; 5659 case TOK_OLIST: 5660 ipfw_list_objects(ac, av); 5661 break; 5662 case TOK_VLIST: 5663 ipfw_list_values(ac, av); 5664 break; 5665 } 5666 } 5667 5668 static int 5669 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 5670 { 5671 ipfw_obj_lheader req, *olh; 5672 size_t sz; 5673 5674 memset(&req, 0, sizeof(req)); 5675 sz = sizeof(req); 5676 5677 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 5678 if (errno != ENOMEM) 5679 return (errno); 5680 } 5681 5682 sz = req.size; 5683 if ((olh = calloc(1, sz)) == NULL) 5684 return (ENOMEM); 5685 5686 olh->size = sz; 5687 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 5688 free(olh); 5689 return (errno); 5690 } 5691 5692 *polh = olh; 5693 return (0); 5694 } 5695 5696 static int 5697 ifinfo_cmp(const void *a, const void *b) 5698 { 5699 const ipfw_iface_info *ia, *ib; 5700 5701 ia = (const ipfw_iface_info *)a; 5702 ib = (const ipfw_iface_info *)b; 5703 5704 return (stringnum_cmp(ia->ifname, ib->ifname)); 5705 } 5706 5707 /* 5708 * Retrieves table list from kernel, 5709 * optionally sorts it and calls requested function for each table. 5710 * Returns 0 on success. 5711 */ 5712 static void 5713 ipfw_list_tifaces(void) 5714 { 5715 ipfw_obj_lheader *olh = NULL; 5716 ipfw_iface_info *info; 5717 uint32_t i; 5718 int error; 5719 5720 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 5721 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 5722 5723 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 5724 5725 info = (ipfw_iface_info *)(olh + 1); 5726 for (i = 0; i < olh->count; i++) { 5727 if (info->flags & IPFW_IFFLAG_RESOLVED) 5728 printf("%s ifindex: %d refcount: %u changes: %u\n", 5729 info->ifname, info->ifindex, info->refcnt, 5730 info->gencnt); 5731 else 5732 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 5733 info->ifname, info->refcnt, info->gencnt); 5734 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 5735 } 5736 5737 free(olh); 5738 } 5739