1 /*- 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 */ 20 21 #include <sys/types.h> 22 #include <sys/param.h> 23 #include <sys/socket.h> 24 #include <sys/sockio.h> 25 #include <sys/sysctl.h> 26 27 #include "ipfw2.h" 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <grp.h> 33 #include <jail.h> 34 #include <netdb.h> 35 #include <pwd.h> 36 #include <stdio.h> 37 #include <stdarg.h> 38 #include <stdint.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <sysexits.h> 42 #include <time.h> /* ctime */ 43 #include <timeconv.h> /* _long_to_time */ 44 #include <unistd.h> 45 #include <fcntl.h> 46 #include <stddef.h> /* offsetof */ 47 48 #include <net/ethernet.h> 49 #include <net/if.h> /* only IFNAMSIZ */ 50 #include <net/if_dl.h> 51 #include <net/route.h> 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 { "setmark", TOK_SETMARK }, 292 { NULL, 0 } /* terminator */ 293 }; 294 295 static struct _s_x return_types[] = { 296 { "next-rulenum", RETURN_NEXT_RULENUM }, 297 { "next-rule", RETURN_NEXT_RULE }, 298 { NULL, 0 } /* terminator */ 299 }; 300 301 static struct _s_x rule_action_params[] = { 302 { "altq", TOK_ALTQ }, 303 { "log", TOK_LOG }, 304 { "tag", TOK_TAG }, 305 { "untag", TOK_UNTAG }, 306 { NULL, 0 } /* terminator */ 307 }; 308 309 /* 310 * The 'lookup' instruction accepts one of the following arguments. 311 * Arguments are passed as o.arg1 and o->value in O_DST_LOOKUP option. 312 */ 313 static struct _s_x lookup_keys[] = { 314 { "dst-ip", LOOKUP_DST_IP }, 315 { "src-ip", LOOKUP_SRC_IP }, 316 { "dst-port", LOOKUP_DST_PORT }, 317 { "src-port", LOOKUP_SRC_PORT }, 318 { "dst-mac", LOOKUP_DST_MAC }, 319 { "src-mac", LOOKUP_SRC_MAC }, 320 { "uid", LOOKUP_UID }, 321 { "jail", LOOKUP_JAIL }, 322 { "dscp", LOOKUP_DSCP }, 323 { "mark", LOOKUP_MARK }, 324 { "rulenum", LOOKUP_RULENUM }, 325 { NULL, 0 }, 326 }; 327 328 /* 329 * table(name,valuename=value) instruction accepts one of the 330 * following arguments as valuename. 331 */ 332 static struct _s_x tvalue_names[] = { 333 { "tag", TVALUE_TAG }, 334 { "pipe", TVALUE_PIPE }, 335 { "divert", TVALUE_DIVERT }, 336 { "skipto", TVALUE_SKIPTO }, 337 { "netgraph", TVALUE_NETGRAPH }, 338 { "fib", TVALUE_FIB }, 339 { "nat", TVALUE_NAT }, 340 { "nh4", TVALUE_NH4 }, 341 { "dscp", TVALUE_DSCP }, 342 { "limit", TVALUE_LIMIT }, 343 { "mark", TVALUE_MARK }, 344 { NULL, 0 } 345 }; 346 347 static struct _s_x rule_options[] = { 348 { "tagged", TOK_TAGGED }, 349 { "uid", TOK_UID }, 350 { "gid", TOK_GID }, 351 { "jail", TOK_JAIL }, 352 { "in", TOK_IN }, 353 { "limit", TOK_LIMIT }, 354 { "set-limit", TOK_SETLIMIT }, 355 { "keep-state", TOK_KEEPSTATE }, 356 { "record-state", TOK_RECORDSTATE }, 357 { "bridged", TOK_LAYER2 }, 358 { "layer2", TOK_LAYER2 }, 359 { "out", TOK_OUT }, 360 { "diverted", TOK_DIVERTED }, 361 { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, 362 { "diverted-output", TOK_DIVERTEDOUTPUT }, 363 { "xmit", TOK_XMIT }, 364 { "recv", TOK_RECV }, 365 { "via", TOK_VIA }, 366 { "fragment", TOK_FRAG }, 367 { "frag", TOK_FRAG }, 368 { "fib", TOK_FIB }, 369 { "ipoptions", TOK_IPOPTS }, 370 { "ipopts", TOK_IPOPTS }, 371 { "iplen", TOK_IPLEN }, 372 { "ipid", TOK_IPID }, 373 { "ipprecedence", TOK_IPPRECEDENCE }, 374 { "dscp", TOK_DSCP }, 375 { "iptos", TOK_IPTOS }, 376 { "ipttl", TOK_IPTTL }, 377 { "ipversion", TOK_IPVER }, 378 { "ipver", TOK_IPVER }, 379 { "estab", TOK_ESTAB }, 380 { "established", TOK_ESTAB }, 381 { "setup", TOK_SETUP }, 382 { "sockarg", TOK_SOCKARG }, 383 { "tcpdatalen", TOK_TCPDATALEN }, 384 { "tcpflags", TOK_TCPFLAGS }, 385 { "tcpflgs", TOK_TCPFLAGS }, 386 { "tcpmss", TOK_TCPMSS }, 387 { "tcpoptions", TOK_TCPOPTS }, 388 { "tcpopts", TOK_TCPOPTS }, 389 { "tcpseq", TOK_TCPSEQ }, 390 { "tcpack", TOK_TCPACK }, 391 { "tcpwin", TOK_TCPWIN }, 392 { "icmptype", TOK_ICMPTYPES }, 393 { "icmptypes", TOK_ICMPTYPES }, 394 { "dst-ip", TOK_DSTIP }, 395 { "src-ip", TOK_SRCIP }, 396 { "dst-port", TOK_DSTPORT }, 397 { "src-port", TOK_SRCPORT }, 398 { "dst-mac", TOK_DSTMAC }, 399 { "src-mac", TOK_SRCMAC }, 400 { "proto", TOK_PROTO }, 401 { "MAC", TOK_MAC }, 402 { "mac", TOK_MAC }, 403 { "mac-type", TOK_MACTYPE }, 404 { "verrevpath", TOK_VERREVPATH }, 405 { "versrcreach", TOK_VERSRCREACH }, 406 { "antispoof", TOK_ANTISPOOF }, 407 { "ipsec", TOK_IPSEC }, 408 { "icmp6type", TOK_ICMP6TYPES }, 409 { "icmp6types", TOK_ICMP6TYPES }, 410 { "ext6hdr", TOK_EXT6HDR }, 411 { "flow-id", TOK_FLOWID }, 412 { "ipv6", TOK_IPV6 }, 413 { "ip6", TOK_IPV6 }, 414 { "ipv4", TOK_IPV4 }, 415 { "ip4", TOK_IPV4 }, 416 { "dst-ipv6", TOK_DSTIP6 }, 417 { "dst-ip6", TOK_DSTIP6 }, 418 { "src-ipv6", TOK_SRCIP6 }, 419 { "src-ip6", TOK_SRCIP6 }, 420 { "lookup", TOK_LOOKUP }, 421 { "flow", TOK_FLOW }, 422 { "mark", TOK_MARK }, 423 { "defer-action", TOK_SKIPACTION }, 424 { "defer-immediate-action", TOK_SKIPACTION }, 425 { "//", TOK_COMMENT }, 426 427 { "not", TOK_NOT }, /* pseudo option */ 428 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 429 { "or", TOK_OR }, /* pseudo option */ 430 { "|", /* escape */ TOK_OR }, /* pseudo option */ 431 { "{", TOK_STARTBRACE }, /* pseudo option */ 432 { "(", TOK_STARTBRACE }, /* pseudo option */ 433 { "}", TOK_ENDBRACE }, /* pseudo option */ 434 { ")", TOK_ENDBRACE }, /* pseudo option */ 435 { NULL, 0 } /* terminator */ 436 }; 437 438 void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); 439 static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 440 ipfw_cfg_lheader **pcfg, size_t *psize); 441 static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 442 ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); 443 static void ipfw_list_tifaces(void); 444 445 struct tidx; 446 static uint32_t pack_object(struct tidx *tstate, const char *name, int otype); 447 static uint32_t pack_table(struct tidx *tstate, const char *name); 448 449 static char *table_search_ctlv(ipfw_obj_ctlv *ctlv, uint32_t idx); 450 static void object_sort_ctlv(ipfw_obj_ctlv *ctlv); 451 static char *object_search_ctlv(ipfw_obj_ctlv *ctlv, uint32_t idx, 452 uint16_t type); 453 454 int 455 is_ipfw(void) 456 { 457 return (g_co.prog == cmdline_prog_ipfw); 458 } 459 460 /* 461 * Simple string buffer API. 462 * Used to simplify buffer passing between function and for 463 * transparent overrun handling. 464 */ 465 466 /* 467 * Allocates new buffer of given size @sz. 468 * 469 * Returns 0 on success. 470 */ 471 int 472 bp_alloc(struct buf_pr *b, size_t size) 473 { 474 memset(b, 0, sizeof(struct buf_pr)); 475 476 if ((b->buf = calloc(1, size)) == NULL) 477 return (ENOMEM); 478 479 b->ptr = b->buf; 480 b->size = size; 481 b->avail = b->size; 482 483 return (0); 484 } 485 486 void 487 bp_free(struct buf_pr *b) 488 { 489 490 free(b->buf); 491 } 492 493 /* 494 * Flushes buffer so new writer start from beginning. 495 */ 496 void 497 bp_flush(struct buf_pr *b) 498 { 499 500 b->ptr = b->buf; 501 b->avail = b->size; 502 b->buf[0] = '\0'; 503 } 504 505 /* 506 * Print message specified by @format and args. 507 * Automatically manage buffer space and transparently handle 508 * buffer overruns. 509 * 510 * Returns number of bytes that should have been printed. 511 */ 512 int 513 bprintf(struct buf_pr *b, const char *format, ...) 514 { 515 va_list args; 516 int i; 517 518 va_start(args, format); 519 520 i = vsnprintf(b->ptr, b->avail, format, args); 521 va_end(args); 522 523 if (i < 0 || (size_t)i > b->avail) { 524 /* Overflow or print error */ 525 b->avail = 0; 526 } else { 527 b->ptr += i; 528 b->avail -= i; 529 } 530 531 b->needed += i; 532 533 return (i); 534 } 535 536 /* 537 * Special values printer for tablearg-aware opcodes. 538 */ 539 void 540 bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) 541 { 542 543 if (str != NULL) 544 bprintf(bp, "%s", str); 545 if (arg == IP_FW_TARG) 546 bprintf(bp, "tablearg"); 547 else 548 bprintf(bp, "%u", arg); 549 } 550 551 /* 552 * Helper routine to print a possibly unaligned uint64_t on 553 * various platform. If width > 0, print the value with 554 * the desired width, followed by a space; 555 * otherwise, return the required width. 556 */ 557 int 558 pr_u64(struct buf_pr *b, void *pd, int width) 559 { 560 #ifdef TCC 561 #define U64_FMT "I64" 562 #else 563 #define U64_FMT "llu" 564 #endif 565 uint64_t u; 566 unsigned long long d; 567 568 bcopy (pd, &u, sizeof(u)); 569 d = u; 570 return (width > 0) ? 571 bprintf(b, "%*" U64_FMT " ", width, d) : 572 snprintf(NULL, 0, "%" U64_FMT, d) ; 573 #undef U64_FMT 574 } 575 576 577 void * 578 safe_calloc(size_t number, size_t size) 579 { 580 void *ret = calloc(number, size); 581 582 if (ret == NULL) 583 err(EX_OSERR, "calloc"); 584 return ret; 585 } 586 587 void * 588 safe_realloc(void *ptr, size_t size) 589 { 590 void *ret = realloc(ptr, size); 591 592 if (ret == NULL) 593 err(EX_OSERR, "realloc"); 594 return ret; 595 } 596 597 /* 598 * Compare things like interface or table names. 599 */ 600 int 601 stringnum_cmp(const char *a, const char *b) 602 { 603 int la, lb; 604 605 la = strlen(a); 606 lb = strlen(b); 607 608 if (la > lb) 609 return (1); 610 else if (la < lb) 611 return (-01); 612 613 return (strcmp(a, b)); 614 } 615 616 struct debug_header { 617 uint16_t cmd_type; 618 uint16_t spare1; 619 uint32_t opt_name; 620 uint32_t total_len; 621 uint32_t spare2; 622 }; 623 624 /* 625 * conditionally runs the command. 626 * Selected options or negative -> getsockopt 627 */ 628 int 629 do_cmd(int optname, void *optval, uintptr_t optlen) 630 { 631 int i; 632 633 if (g_co.debug_only) { 634 struct debug_header dbg = { 635 .cmd_type = 1, 636 .opt_name = optname, 637 .total_len = optlen + sizeof(struct debug_header), 638 }; 639 write(1, &dbg, sizeof(dbg)); 640 write(1, optval, optlen); 641 } 642 643 if (g_co.test_only) 644 return (0); 645 646 if (ipfw_socket == -1) 647 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 648 if (ipfw_socket < 0) 649 err(EX_UNAVAILABLE, "socket"); 650 651 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 652 optname == IP_FW_ADD || optname == IP_FW3 || 653 optname == IP_FW_NAT_GET_CONFIG || 654 optname < 0 || 655 optname == IP_FW_NAT_GET_LOG) { 656 if (optname < 0) 657 optname = -optname; 658 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, 659 (socklen_t *)optlen); 660 } else { 661 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); 662 } 663 return (i); 664 } 665 666 /* 667 * do_set3 - pass ipfw control cmd to kernel 668 * @optname: option name 669 * @optval: pointer to option data 670 * @optlen: option length 671 * 672 * Assumes op3 header is already embedded. 673 * Calls setsockopt() with IP_FW3 as kernel-visible opcode. 674 * Returns 0 on success or errno otherwise. 675 */ 676 int 677 do_set3(int optname, ip_fw3_opheader *op3, size_t optlen) 678 { 679 680 op3->opcode = optname; 681 op3->version = IP_FW3_OPVER; /* use last version */ 682 683 if (g_co.debug_only) { 684 struct debug_header dbg = { 685 .cmd_type = 2, 686 .opt_name = optname, 687 .total_len = optlen, sizeof(struct debug_header), 688 }; 689 write(1, &dbg, sizeof(dbg)); 690 write(1, op3, optlen); 691 } 692 693 if (g_co.test_only) 694 return (0); 695 696 if (ipfw_socket == -1) 697 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 698 if (ipfw_socket < 0) 699 err(EX_UNAVAILABLE, "socket"); 700 701 702 return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen)); 703 } 704 705 /* 706 * do_get3 - pass ipfw control cmd to kernel 707 * @optname: option name 708 * @optval: pointer to option data 709 * @optlen: pointer to option length 710 * 711 * Assumes op3 header is already embedded. 712 * Calls getsockopt() with IP_FW3 as kernel-visible opcode. 713 * Returns 0 on success or errno otherwise. 714 */ 715 int 716 do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) 717 { 718 int error; 719 socklen_t len; 720 721 op3->opcode = optname; 722 op3->version = IP_FW3_OPVER; /* use last version */ 723 724 if (g_co.debug_only) { 725 struct debug_header dbg = { 726 .cmd_type = 3, 727 .opt_name = optname, 728 .total_len = *optlen + sizeof(struct debug_header), 729 }; 730 write(1, &dbg, sizeof(dbg)); 731 write(1, op3, *optlen); 732 } 733 734 if (g_co.test_only) 735 return (0); 736 737 if (ipfw_socket == -1) 738 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 739 if (ipfw_socket < 0) 740 err(EX_UNAVAILABLE, "socket"); 741 742 743 len = *optlen; 744 error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, &len); 745 *optlen = len; 746 747 return (error); 748 } 749 750 /** 751 * match_token takes a table and a string, returns the value associated 752 * with the string (-1 in case of failure). 753 */ 754 int 755 match_token(struct _s_x *table, const char *string) 756 { 757 struct _s_x *pt; 758 uint i = strlen(string); 759 760 for (pt = table ; i && pt->s != NULL ; pt++) 761 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 762 return pt->x; 763 return (-1); 764 } 765 766 /** 767 * match_token_relaxed takes a table and a string, returns the value associated 768 * with the string for the best match. 769 * 770 * Returns: 771 * value from @table for matched records 772 * -1 for non-matched records 773 * -2 if more than one records match @string. 774 */ 775 int 776 match_token_relaxed(struct _s_x *table, const char *string) 777 { 778 struct _s_x *pt, *m; 779 int i, c; 780 781 i = strlen(string); 782 c = 0; 783 784 for (pt = table ; i != 0 && pt->s != NULL ; pt++) { 785 if (strncmp(pt->s, string, i) != 0) 786 continue; 787 m = pt; 788 c++; 789 } 790 791 if (c == 1) 792 return (m->x); 793 794 return (c > 0 ? -2: -1); 795 } 796 797 int 798 get_token(struct _s_x *table, const char *string, const char *errbase) 799 { 800 int tcmd; 801 802 if ((tcmd = match_token_relaxed(table, string)) < 0) 803 errx(EX_USAGE, "%s %s %s", 804 (tcmd == 0) ? "invalid" : "ambiguous", errbase, string); 805 806 return (tcmd); 807 } 808 809 /** 810 * match_value takes a table and a value, returns the string associated 811 * with the value (NULL in case of failure). 812 */ 813 char const * 814 match_value(struct _s_x *p, int value) 815 { 816 for (; p->s != NULL; p++) 817 if (p->x == value) 818 return p->s; 819 return NULL; 820 } 821 822 size_t 823 concat_tokens(char *buf, size_t bufsize, struct _s_x *table, 824 const char *delimiter) 825 { 826 struct _s_x *pt; 827 int l; 828 size_t sz; 829 830 for (sz = 0, pt = table ; pt->s != NULL; pt++) { 831 l = snprintf(buf + sz, bufsize - sz, "%s%s", 832 (sz == 0) ? "" : delimiter, pt->s); 833 sz += l; 834 bufsize += l; 835 if (sz > bufsize) 836 return (bufsize); 837 } 838 839 return (sz); 840 } 841 842 /* 843 * helper function to process a set of flags and set bits in the 844 * appropriate masks. 845 */ 846 int 847 fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set, 848 uint32_t *clear) 849 { 850 char *q; /* points to the separator */ 851 int val; 852 uint32_t *which; /* mask we are working on */ 853 854 while (p && *p) { 855 if (*p == '!') { 856 p++; 857 which = clear; 858 } else 859 which = set; 860 q = strchr(p, ','); 861 if (q) 862 *q++ = '\0'; 863 val = match_token(flags, p); 864 if (val <= 0) { 865 if (e != NULL) 866 *e = p; 867 return (-1); 868 } 869 *which |= (uint32_t)val; 870 p = q; 871 } 872 return (0); 873 } 874 875 void 876 print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set) 877 { 878 char const *comma = ""; 879 int i, l; 880 881 for (i = 0; list[i].x != 0; i++) { 882 if ((set & list[i].x) == 0) 883 continue; 884 885 set &= ~list[i].x; 886 l = snprintf(buf, sz, "%s%s", comma, list[i].s); 887 if (l < 0 || (size_t)l >= sz) 888 return; 889 comma = ","; 890 buf += l; 891 sz -=l; 892 } 893 } 894 895 /* 896 * _substrcmp takes two strings and returns 1 if they do not match, 897 * and 0 if they match exactly or the first string is a sub-string 898 * of the second. A warning is printed to stderr in the case that the 899 * first string is a sub-string of the second. 900 * 901 * This function will be removed in the future through the usual 902 * deprecation process. 903 */ 904 int 905 _substrcmp(const char *str1, const char* str2) 906 { 907 908 if (strncmp(str1, str2, strlen(str1)) != 0) 909 return 1; 910 911 if (strlen(str1) != strlen(str2)) 912 warnx("DEPRECATED: '%s' matched '%s' as a sub-string", 913 str1, str2); 914 return 0; 915 } 916 917 /* 918 * _substrcmp2 takes three strings and returns 1 if the first two do not match, 919 * and 0 if they match exactly or the second string is a sub-string 920 * of the first. A warning is printed to stderr in the case that the 921 * first string does not match the third. 922 * 923 * This function exists to warn about the bizarre construction 924 * strncmp(str, "by", 2) which is used to allow people to use a shortcut 925 * for "bytes". The problem is that in addition to accepting "by", 926 * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any 927 * other string beginning with "by". 928 * 929 * This function will be removed in the future through the usual 930 * deprecation process. 931 */ 932 int 933 _substrcmp2(const char *str1, const char* str2, const char* str3) 934 { 935 936 if (strncmp(str1, str2, strlen(str2)) != 0) 937 return 1; 938 939 if (strcmp(str1, str3) != 0) 940 warnx("DEPRECATED: '%s' matched '%s'", 941 str1, str3); 942 return 0; 943 } 944 945 /* 946 * prints one port, symbolic or numeric 947 */ 948 static void 949 print_port(struct buf_pr *bp, int proto, uint16_t port) 950 { 951 952 if (proto == IPPROTO_ETHERTYPE) { 953 char const *s; 954 955 if (g_co.do_resolv && (s = match_value(ether_types, port)) ) 956 bprintf(bp, "%s", s); 957 else 958 bprintf(bp, "0x%04x", port); 959 } else { 960 struct servent *se = NULL; 961 if (g_co.do_resolv) { 962 struct protoent *pe = getprotobynumber(proto); 963 964 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 965 } 966 if (se) 967 bprintf(bp, "%s", se->s_name); 968 else 969 bprintf(bp, "%d", port); 970 } 971 } 972 973 static struct _s_x _port_name[] = { 974 {"dst-port", O_IP_DSTPORT}, 975 {"src-port", O_IP_SRCPORT}, 976 {"ipid", O_IPID}, 977 {"iplen", O_IPLEN}, 978 {"ipttl", O_IPTTL}, 979 {"mac-type", O_MAC_TYPE}, 980 {"tcpdatalen", O_TCPDATALEN}, 981 {"tcpmss", O_TCPMSS}, 982 {"tcpwin", O_TCPWIN}, 983 {"tagged", O_TAGGED}, 984 {NULL, 0} 985 }; 986 987 /* 988 * Print the values in a list 16-bit items of the types above. 989 * XXX todo: add support for mask. 990 */ 991 static void 992 print_newports(struct buf_pr *bp, const ipfw_insn_u16 *cmd, int proto, int opcode) 993 { 994 const uint16_t *p = cmd->ports; 995 int i; 996 char const *sep; 997 998 if (opcode != 0) { 999 sep = match_value(_port_name, opcode); 1000 if (sep == NULL) 1001 sep = "???"; 1002 bprintf(bp, " %s", sep); 1003 } 1004 sep = " "; 1005 for (i = F_LEN((const ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 1006 bprintf(bp, "%s", sep); 1007 print_port(bp, proto, p[0]); 1008 if (p[0] != p[1]) { 1009 bprintf(bp, "-"); 1010 print_port(bp, proto, p[1]); 1011 } 1012 sep = ","; 1013 } 1014 } 1015 1016 /* 1017 * Like strtol, but also translates service names into port numbers 1018 * for some protocols. 1019 * In particular: 1020 * proto == -1 disables the protocol check; 1021 * proto == IPPROTO_ETHERTYPE looks up an internal table 1022 * proto == <some value in /etc/protocols> matches the values there. 1023 * Returns *end == s in case the parameter is not found. 1024 */ 1025 static int 1026 strtoport(char *s, char **end, int base, int proto) 1027 { 1028 char *p, *buf; 1029 char *s1; 1030 int i; 1031 1032 *end = s; /* default - not found */ 1033 if (*s == '\0') 1034 return 0; /* not found */ 1035 1036 if (isdigit(*s)) 1037 return strtol(s, end, base); 1038 1039 /* 1040 * find separator. '\\' escapes the next char. 1041 */ 1042 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\' || 1043 *s1 == '_' || *s1 == '.') ; s1++) 1044 if (*s1 == '\\' && s1[1] != '\0') 1045 s1++; 1046 1047 buf = safe_calloc(s1 - s + 1, 1); 1048 1049 /* 1050 * copy into a buffer skipping backslashes 1051 */ 1052 for (p = s, i = 0; p != s1 ; p++) 1053 if (*p != '\\') 1054 buf[i++] = *p; 1055 buf[i++] = '\0'; 1056 1057 if (proto == IPPROTO_ETHERTYPE) { 1058 i = match_token(ether_types, buf); 1059 free(buf); 1060 if (i != -1) { /* found */ 1061 *end = s1; 1062 return i; 1063 } 1064 } else { 1065 struct protoent *pe = NULL; 1066 struct servent *se; 1067 1068 if (proto != 0) 1069 pe = getprotobynumber(proto); 1070 setservent(1); 1071 se = getservbyname(buf, pe ? pe->p_name : NULL); 1072 free(buf); 1073 if (se != NULL) { 1074 *end = s1; 1075 return ntohs(se->s_port); 1076 } 1077 } 1078 return 0; /* not found */ 1079 } 1080 1081 /* 1082 * Fill the body of the command with the list of port ranges. 1083 */ 1084 static int 1085 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) 1086 { 1087 uint16_t a, b, *p = cmd->ports; 1088 int i = 0; 1089 char *s = av; 1090 1091 while (*s) { 1092 a = strtoport(av, &s, 0, proto); 1093 if (s == av) /* empty or invalid argument */ 1094 return (0); 1095 1096 CHECK_LENGTH(cblen, i + 2); 1097 1098 switch (*s) { 1099 case '-': /* a range */ 1100 av = s + 1; 1101 b = strtoport(av, &s, 0, proto); 1102 /* Reject expressions like '1-abc' or '1-2-3'. */ 1103 if (s == av || (*s != ',' && *s != '\0')) 1104 return (0); 1105 p[0] = a; 1106 p[1] = b; 1107 break; 1108 case ',': /* comma separated list */ 1109 case '\0': 1110 p[0] = p[1] = a; 1111 break; 1112 default: 1113 warnx("port list: invalid separator <%c> in <%s>", 1114 *s, av); 1115 return (0); 1116 } 1117 1118 i++; 1119 p += 2; 1120 av = s + 1; 1121 } 1122 if (i > 0) { 1123 if (i + 1 > F_LEN_MASK) 1124 errx(EX_DATAERR, "too many ports/ranges\n"); 1125 cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ 1126 } 1127 return (i); 1128 } 1129 1130 /* 1131 * Fill the body of the command with the list of DiffServ codepoints. 1132 */ 1133 static void 1134 fill_dscp(ipfw_insn *cmd, char *av, int cblen) 1135 { 1136 uint32_t *low, *high; 1137 char *s = av, *a; 1138 int code; 1139 1140 cmd->opcode = O_DSCP; 1141 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1142 1143 CHECK_CMDLEN; 1144 1145 low = (uint32_t *)(cmd + 1); 1146 high = low + 1; 1147 1148 *low = 0; 1149 *high = 0; 1150 1151 while (s != NULL) { 1152 a = strchr(s, ','); 1153 1154 if (a != NULL) 1155 *a++ = '\0'; 1156 1157 if (isalpha(*s)) { 1158 if ((code = match_token(f_ipdscp, s)) == -1) 1159 errx(EX_DATAERR, "Unknown DSCP code"); 1160 } else { 1161 code = strtoul(s, NULL, 10); 1162 if (code < 0 || code > 63) 1163 errx(EX_DATAERR, "Invalid DSCP value"); 1164 } 1165 1166 if (code >= 32) 1167 *high |= 1 << (code - 32); 1168 else 1169 *low |= 1 << code; 1170 1171 s = a; 1172 } 1173 } 1174 1175 /* 1176 * Fill the body of the command with mark value and mask. 1177 */ 1178 static void 1179 fill_mark(ipfw_insn *cmd, char *av, int cblen) 1180 { 1181 uint32_t *value, *mask; 1182 char *value_str; 1183 1184 cmd->opcode = O_MARK; 1185 cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; 1186 1187 CHECK_CMDLEN; 1188 1189 value = (uint32_t *)(cmd + 1); 1190 mask = value + 1; 1191 1192 value_str = strsep(&av, ":"); 1193 1194 if (strcmp(value_str, "tablearg") == 0) { 1195 cmd->arg1 = IP_FW_TARG; 1196 *value = 0; 1197 } else { 1198 /* This is not a tablearg */ 1199 cmd->arg1 |= 0x8000; 1200 *value = strtoul(value_str, NULL, 0); 1201 } 1202 if (av) 1203 *mask = strtoul(av, NULL, 0); 1204 else 1205 *mask = 0xFFFFFFFF; 1206 1207 if ((*value & *mask) != *value) 1208 errx(EX_DATAERR, "Static mark value: some bits in value are" 1209 " set that will be masked out by mask " 1210 "(%#x & %#x) = %#x != %#x", 1211 *value, *mask, (*value & *mask), *value); 1212 } 1213 1214 static struct _s_x icmpcodes[] = { 1215 { "net", ICMP_UNREACH_NET }, 1216 { "host", ICMP_UNREACH_HOST }, 1217 { "protocol", ICMP_UNREACH_PROTOCOL }, 1218 { "port", ICMP_UNREACH_PORT }, 1219 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 1220 { "srcfail", ICMP_UNREACH_SRCFAIL }, 1221 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 1222 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 1223 { "isolated", ICMP_UNREACH_ISOLATED }, 1224 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 1225 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 1226 { "tosnet", ICMP_UNREACH_TOSNET }, 1227 { "toshost", ICMP_UNREACH_TOSHOST }, 1228 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 1229 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 1230 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 1231 { NULL, 0 } 1232 }; 1233 1234 static uint16_t 1235 get_reject_code(const char *str) 1236 { 1237 int val; 1238 char *s; 1239 1240 val = strtoul(str, &s, 0); 1241 if (s == str || *s != '\0' || val >= 0x100) 1242 val = match_token(icmpcodes, str); 1243 if (val < 0) 1244 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 1245 return (val); 1246 } 1247 1248 static void 1249 print_reject_code(struct buf_pr *bp, uint16_t code) 1250 { 1251 char const *s; 1252 1253 if ((s = match_value(icmpcodes, code)) != NULL) 1254 bprintf(bp, "unreach %s", s); 1255 else 1256 bprintf(bp, "unreach %u", code); 1257 } 1258 1259 /* 1260 * Returns the number of bits set (from left) in a contiguous bitmask, 1261 * or -1 if the mask is not contiguous. 1262 * XXX this needs a proper fix. 1263 * This effectively works on masks in big-endian (network) format. 1264 * when compiled on little endian architectures. 1265 * 1266 * First bit is bit 7 of the first byte -- note, for MAC addresses, 1267 * the first bit on the wire is bit 0 of the first byte. 1268 * len is the max length in bits. 1269 */ 1270 int 1271 contigmask(const uint8_t *p, int len) 1272 { 1273 int i, n; 1274 1275 for (i=0; i<len ; i++) 1276 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 1277 break; 1278 for (n=i+1; n < len; n++) 1279 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 1280 return -1; /* mask not contiguous */ 1281 return i; 1282 } 1283 1284 /* 1285 * print flags set/clear in the two bitmasks passed as parameters. 1286 * There is a specialized check for f_tcpflags. 1287 */ 1288 static void 1289 print_flags(struct buf_pr *bp, char const *name, const ipfw_insn *cmd, 1290 struct _s_x *list) 1291 { 1292 char const *comma = ""; 1293 int i; 1294 uint8_t set = cmd->arg1 & 0xff; 1295 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 1296 1297 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 1298 bprintf(bp, " setup"); 1299 return; 1300 } 1301 1302 bprintf(bp, " %s ", name); 1303 for (i=0; list[i].x != 0; i++) { 1304 if (set & list[i].x) { 1305 set &= ~list[i].x; 1306 bprintf(bp, "%s%s", comma, list[i].s); 1307 comma = ","; 1308 } 1309 if (clear & list[i].x) { 1310 clear &= ~list[i].x; 1311 bprintf(bp, "%s!%s", comma, list[i].s); 1312 comma = ","; 1313 } 1314 } 1315 } 1316 1317 static void 1318 print_tvalue(struct buf_pr *bp, const ipfw_insn_table *cmd) 1319 { 1320 const char *name; 1321 1322 name = match_value(tvalue_names, IPFW_TVALUE_TYPE(&cmd->o)); 1323 bprintf(bp, ",%s=%u", name != NULL ? name: "<invalid>", cmd->value); 1324 } 1325 1326 1327 /* 1328 * Print the ip address contained in a command. 1329 */ 1330 static void 1331 print_ip(struct buf_pr *bp, const struct format_opts *fo, 1332 const ipfw_insn_ip *cmd) 1333 { 1334 struct hostent *he = NULL; 1335 const struct in_addr *ia; 1336 const uint32_t *a = ((const ipfw_insn_u32 *)cmd)->d; 1337 uint32_t len = F_LEN(&cmd->o); 1338 char *t; 1339 1340 bprintf(bp, " "); 1341 switch (cmd->o.opcode) { 1342 case O_IP_SRC_ME: 1343 case O_IP_DST_ME: 1344 bprintf(bp, "me"); 1345 return; 1346 1347 case O_IP_DST_LOOKUP: 1348 if ((len == F_INSN_SIZE(ipfw_insn_kidx) || 1349 len == F_INSN_SIZE(ipfw_insn_table)) && 1350 IPFW_LOOKUP_TYPE(&cmd->o) != LOOKUP_NONE) { 1351 const char *key; 1352 1353 key = match_value(lookup_keys, 1354 IPFW_LOOKUP_TYPE(&cmd->o)); 1355 t = table_search_ctlv(fo->tstate, 1356 insntoc(&cmd->o, kidx)->kidx); 1357 if (len == F_INSN_SIZE(ipfw_insn_table)) { 1358 bprintf(bp, "lookup %s:%#x %s", 1359 (key != NULL ? key : "<invalid>"), 1360 insntoc(&cmd->o, table)->value, t); 1361 } else 1362 bprintf(bp, "lookup %s %s", key != NULL ? key: 1363 "<invalid>", t); 1364 return; 1365 } 1366 /* FALLTHROUGH */ 1367 case O_IP_SRC_LOOKUP: 1368 t = table_search_ctlv(fo->tstate, 1369 insntoc(&cmd->o, kidx)->kidx); 1370 bprintf(bp, "table(%s", t); 1371 if (len == F_INSN_SIZE(ipfw_insn_table)) 1372 print_tvalue(bp, insntoc(&cmd->o, table)); 1373 bprintf(bp, ")"); 1374 return; 1375 } 1376 1377 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 1378 const uint32_t *map = (const uint32_t *)&cmd->mask; 1379 struct in_addr addr; 1380 uint32_t x; 1381 int i, j; 1382 char comma = '{'; 1383 1384 x = cmd->o.arg1 - 1; 1385 x = htonl(~x); 1386 addr.s_addr = htonl(cmd->addr.s_addr); 1387 bprintf(bp, "%s/%d", inet_ntoa(addr), 1388 contigmask((uint8_t *)&x, 32)); 1389 x = cmd->addr.s_addr; 1390 x &= 0xff; /* base */ 1391 /* 1392 * Print bits and ranges. 1393 * Locate first bit set (i), then locate first bit unset (j). 1394 * If we have 3+ consecutive bits set, then print them as a 1395 * range, otherwise only print the initial bit and rescan. 1396 */ 1397 for (i=0; i < cmd->o.arg1; i++) 1398 if (map[i/32] & (1<<(i & 31))) { 1399 for (j=i+1; j < cmd->o.arg1; j++) 1400 if (!(map[ j/32] & (1<<(j & 31)))) 1401 break; 1402 bprintf(bp, "%c%d", comma, i+x); 1403 if (j>i+2) { /* range has at least 3 elements */ 1404 bprintf(bp, "-%d", j-1+x); 1405 i = j-1; 1406 } 1407 comma = ','; 1408 } 1409 bprintf(bp, "}"); 1410 return; 1411 } 1412 /* 1413 * len == 2 indicates a single IP, whereas lists of 1 or more 1414 * addr/mask pairs have len = (2n+1). We convert len to n so we 1415 * use that to count the number of entries. 1416 */ 1417 for (len = len / 2; len > 0; len--, a += 2) { 1418 int mb = /* mask length */ 1419 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 1420 32 : contigmask((const uint8_t *)&(a[1]), 32); 1421 if (mb == 32 && g_co.do_resolv) 1422 he = gethostbyaddr((const char *)&(a[0]), sizeof(in_addr_t), 1423 AF_INET); 1424 if (he != NULL) /* resolved to name */ 1425 bprintf(bp, "%s", he->h_name); 1426 else if (mb == 0) /* any */ 1427 bprintf(bp, "any"); 1428 else { /* numeric IP followed by some kind of mask */ 1429 ia = (const struct in_addr *)&a[0]; 1430 bprintf(bp, "%s", inet_ntoa(*ia)); 1431 if (mb < 0) { 1432 ia = (const struct in_addr *)&a[1]; 1433 bprintf(bp, ":%s", inet_ntoa(*ia)); 1434 } else if (mb < 32) 1435 bprintf(bp, "/%d", mb); 1436 } 1437 if (len > 1) 1438 bprintf(bp, ","); 1439 } 1440 } 1441 1442 /* 1443 * prints a MAC address/mask pair 1444 */ 1445 static void 1446 format_mac(struct buf_pr *bp, const uint8_t *addr, const uint8_t *mask) 1447 { 1448 int l = contigmask(mask, 48); 1449 1450 if (l == 0) 1451 bprintf(bp, " any"); 1452 else { 1453 bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", 1454 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 1455 if (l == -1) 1456 bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", 1457 mask[0], mask[1], mask[2], 1458 mask[3], mask[4], mask[5]); 1459 else if (l < 48) 1460 bprintf(bp, "/%d", l); 1461 } 1462 } 1463 1464 static void 1465 print_mac(struct buf_pr *bp, const ipfw_insn_mac *mac) 1466 { 1467 1468 bprintf(bp, " MAC"); 1469 format_mac(bp, mac->addr, mac->mask); 1470 format_mac(bp, mac->addr + 6, mac->mask + 6); 1471 } 1472 1473 static void 1474 print_mac_lookup(struct buf_pr *bp, const struct format_opts *fo, 1475 const ipfw_insn *cmd) 1476 { 1477 uint32_t len = F_LEN(cmd); 1478 char *t; 1479 1480 bprintf(bp, " "); 1481 1482 t = table_search_ctlv(fo->tstate, insntoc(cmd, kidx)->kidx); 1483 bprintf(bp, "table(%s", t); 1484 if (len == F_INSN_SIZE(ipfw_insn_table)) 1485 print_tvalue(bp, insntoc(cmd, table)); 1486 bprintf(bp, ")"); 1487 } 1488 1489 static void 1490 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 1491 { 1492 uint8_t type; 1493 1494 cmd->d[0] = 0; 1495 while (*av) { 1496 if (*av == ',') 1497 av++; 1498 1499 type = strtoul(av, &av, 0); 1500 1501 if (*av != ',' && *av != '\0') 1502 errx(EX_DATAERR, "invalid ICMP type"); 1503 1504 if (type > 31) 1505 errx(EX_DATAERR, "ICMP type out of range"); 1506 1507 cmd->d[0] |= 1 << type; 1508 } 1509 cmd->o.opcode = O_ICMPTYPE; 1510 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1511 } 1512 1513 static void 1514 print_icmptypes(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1515 { 1516 int i; 1517 char sep= ' '; 1518 1519 bprintf(bp, " icmptypes"); 1520 for (i = 0; i < 32; i++) { 1521 if ( (cmd->d[0] & (1 << (i))) == 0) 1522 continue; 1523 bprintf(bp, "%c%d", sep, i); 1524 sep = ','; 1525 } 1526 } 1527 1528 static void 1529 print_dscp(struct buf_pr *bp, const ipfw_insn_u32 *cmd) 1530 { 1531 const uint32_t *v; 1532 const char *code; 1533 int i = 0; 1534 char sep= ' '; 1535 1536 bprintf(bp, " dscp"); 1537 v = cmd->d; 1538 while (i < 64) { 1539 if (*v & (1 << i)) { 1540 if ((code = match_value(f_ipdscp, i)) != NULL) 1541 bprintf(bp, "%c%s", sep, code); 1542 else 1543 bprintf(bp, "%c%d", sep, i); 1544 sep = ','; 1545 } 1546 1547 if ((++i % 32) == 0) 1548 v++; 1549 } 1550 } 1551 1552 struct show_state { 1553 struct ip_fw_rule *rule; 1554 const ipfw_insn_kidx *eaction; 1555 uint8_t *printed; 1556 int flags; 1557 #define HAVE_PROTO 0x0001 1558 #define HAVE_SRCIP 0x0002 1559 #define HAVE_DSTIP 0x0004 1560 #define HAVE_PROBE_STATE 0x0008 1561 int proto; 1562 int or_block; 1563 }; 1564 1565 static int 1566 init_show_state(struct show_state *state, struct ip_fw_rule *rule) 1567 { 1568 1569 state->printed = calloc(rule->cmd_len, sizeof(uint8_t)); 1570 if (state->printed == NULL) 1571 return (ENOMEM); 1572 state->rule = rule; 1573 state->eaction = NULL; 1574 state->flags = 0; 1575 state->proto = 0; 1576 state->or_block = 0; 1577 return (0); 1578 } 1579 1580 static void 1581 free_show_state(struct show_state *state) 1582 { 1583 1584 free(state->printed); 1585 } 1586 1587 static uint8_t 1588 is_printed_opcode(struct show_state *state, const ipfw_insn *cmd) 1589 { 1590 1591 return (state->printed[cmd - state->rule->cmd]); 1592 } 1593 1594 static void 1595 mark_printed(struct show_state *state, const ipfw_insn *cmd) 1596 { 1597 1598 state->printed[cmd - state->rule->cmd] = 1; 1599 } 1600 1601 static void 1602 print_limit_mask(struct buf_pr *bp, const ipfw_insn_limit *limit) 1603 { 1604 struct _s_x *p = limit_masks; 1605 char const *comma = " "; 1606 uint8_t x; 1607 1608 for (x = limit->limit_mask; p->x != 0; p++) { 1609 if ((x & p->x) == p->x) { 1610 x &= ~p->x; 1611 bprintf(bp, "%s%s", comma, p->s); 1612 comma = ","; 1613 } 1614 } 1615 bprint_uint_arg(bp, " ", limit->conn_limit); 1616 } 1617 1618 static int 1619 print_instruction(struct buf_pr *bp, const struct format_opts *fo, 1620 struct show_state *state, const ipfw_insn *cmd) 1621 { 1622 struct protoent *pe; 1623 struct passwd *pwd; 1624 struct group *grp; 1625 const char *s; 1626 double d; 1627 1628 if (is_printed_opcode(state, cmd)) 1629 return (0); 1630 if ((cmd->len & F_OR) != 0 && state->or_block == 0) 1631 bprintf(bp, " {"); 1632 if (cmd->opcode != O_IN && (cmd->len & F_NOT) != 0) 1633 bprintf(bp, " not"); 1634 1635 switch (cmd->opcode) { 1636 case O_PROB: 1637 d = 1.0 * insntoc(cmd, u32)->d[0] / 0x7fffffff; 1638 bprintf(bp, "prob %f ", d); 1639 break; 1640 case O_PROBE_STATE: /* no need to print anything here */ 1641 state->flags |= HAVE_PROBE_STATE; 1642 break; 1643 case O_IP_SRC: 1644 case O_IP_SRC_LOOKUP: 1645 case O_IP_SRC_MASK: 1646 case O_IP_SRC_ME: 1647 case O_IP_SRC_SET: 1648 if (state->flags & HAVE_SRCIP) 1649 bprintf(bp, " src-ip"); 1650 print_ip(bp, fo, insntoc(cmd, ip)); 1651 break; 1652 case O_IP_DST: 1653 case O_IP_DST_MASK: 1654 case O_IP_DST_ME: 1655 case O_IP_DST_SET: 1656 case O_IP_DST_LOOKUP: 1657 /* 1658 * Special handling for O_IP_DST_LOOKUP when 1659 * lookup type is not LOOKUP_NONE. 1660 */ 1661 if ((state->flags & HAVE_DSTIP) != 0 && ( 1662 cmd->opcode != O_IP_DST_LOOKUP || 1663 IPFW_LOOKUP_TYPE(cmd) == LOOKUP_NONE)) 1664 bprintf(bp, " dst-ip"); 1665 print_ip(bp, fo, insntoc(cmd, ip)); 1666 break; 1667 case O_IP6_SRC: 1668 case O_IP6_SRC_MASK: 1669 case O_IP6_SRC_ME: 1670 if (state->flags & HAVE_SRCIP) 1671 bprintf(bp, " src-ip6"); 1672 print_ip6(bp, insntoc(cmd, ip6)); 1673 break; 1674 case O_IP6_DST: 1675 case O_IP6_DST_MASK: 1676 case O_IP6_DST_ME: 1677 if (state->flags & HAVE_DSTIP) 1678 bprintf(bp, " dst-ip6"); 1679 print_ip6(bp, insntoc(cmd, ip6)); 1680 break; 1681 case O_MAC_SRC_LOOKUP: 1682 bprintf(bp, " src-mac"); 1683 print_mac_lookup(bp, fo, cmd); 1684 break; 1685 case O_MAC_DST_LOOKUP: 1686 bprintf(bp, " dst-mac"); 1687 print_mac_lookup(bp, fo, cmd); 1688 break; 1689 case O_FLOW6ID: 1690 print_flow6id(bp, insntoc(cmd, u32)); 1691 break; 1692 case O_IP_DSTPORT: 1693 case O_IP_SRCPORT: 1694 print_newports(bp, insntoc(cmd, u16), state->proto, 1695 (state->flags & (HAVE_SRCIP | HAVE_DSTIP)) == 1696 (HAVE_SRCIP | HAVE_DSTIP) ? cmd->opcode: 0); 1697 break; 1698 case O_PROTO: 1699 pe = getprotobynumber(cmd->arg1); 1700 if (state->flags & HAVE_PROTO) 1701 bprintf(bp, " proto"); 1702 if (pe != NULL) 1703 bprintf(bp, " %s", pe->p_name); 1704 else 1705 bprintf(bp, " %u", cmd->arg1); 1706 state->proto = cmd->arg1; 1707 break; 1708 case O_MACADDR2: 1709 print_mac(bp, insntoc(cmd, mac)); 1710 break; 1711 case O_MAC_TYPE: 1712 print_newports(bp, insntoc(cmd, u16), 1713 IPPROTO_ETHERTYPE, cmd->opcode); 1714 break; 1715 case O_FRAG: 1716 print_flags(bp, "frag", cmd, f_ipoff); 1717 break; 1718 case O_FIB: 1719 bprintf(bp, " fib %u", cmd->arg1); 1720 break; 1721 case O_SOCKARG: 1722 bprintf(bp, " sockarg"); 1723 break; 1724 case O_IN: 1725 bprintf(bp, cmd->len & F_NOT ? " out" : " in"); 1726 break; 1727 case O_DIVERTED: 1728 switch (cmd->arg1) { 1729 case 3: 1730 bprintf(bp, " diverted"); 1731 break; 1732 case 2: 1733 bprintf(bp, " diverted-output"); 1734 break; 1735 case 1: 1736 bprintf(bp, " diverted-loopback"); 1737 break; 1738 default: 1739 bprintf(bp, " diverted-?<%u>", cmd->arg1); 1740 break; 1741 } 1742 break; 1743 case O_LAYER2: 1744 bprintf(bp, " layer2"); 1745 break; 1746 case O_XMIT: 1747 case O_RECV: 1748 case O_VIA: 1749 if (cmd->opcode == O_XMIT) 1750 s = "xmit"; 1751 else if (cmd->opcode == O_RECV) 1752 s = "recv"; 1753 else /* if (cmd->opcode == O_VIA) */ 1754 s = "via"; 1755 switch (insntoc(cmd, if)->name[0]) { 1756 case '\0': 1757 bprintf(bp, " %s %s", s, 1758 inet_ntoa(insntoc(cmd, if)->p.ip)); 1759 break; 1760 case '\1': 1761 bprintf(bp, " %s table(%s)", s, 1762 table_search_ctlv(fo->tstate, 1763 insntoc(cmd, if)->p.kidx)); 1764 break; 1765 default: 1766 bprintf(bp, " %s %s", s, 1767 insntoc(cmd, if)->name); 1768 } 1769 break; 1770 case O_IP_FLOW_LOOKUP: 1771 s = table_search_ctlv(fo->tstate, 1772 insntoc(cmd, kidx)->kidx); 1773 bprintf(bp, " flow table(%s", s); 1774 if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_table)) 1775 print_tvalue(bp, insntoc(cmd, table)); 1776 bprintf(bp, ")"); 1777 break; 1778 case O_IPID: 1779 case O_IPTTL: 1780 case O_IPLEN: 1781 case O_TCPDATALEN: 1782 case O_TCPMSS: 1783 case O_TCPWIN: 1784 if (F_LEN(cmd) == 1) { 1785 switch (cmd->opcode) { 1786 case O_IPID: 1787 s = "ipid"; 1788 break; 1789 case O_IPTTL: 1790 s = "ipttl"; 1791 break; 1792 case O_IPLEN: 1793 s = "iplen"; 1794 break; 1795 case O_TCPDATALEN: 1796 s = "tcpdatalen"; 1797 break; 1798 case O_TCPMSS: 1799 s = "tcpmss"; 1800 break; 1801 case O_TCPWIN: 1802 s = "tcpwin"; 1803 break; 1804 default: 1805 s = "<unknown>"; 1806 break; 1807 } 1808 bprintf(bp, " %s %u", s, cmd->arg1); 1809 } else 1810 print_newports(bp, insntoc(cmd, u16), 0, 1811 cmd->opcode); 1812 break; 1813 case O_IPVER: 1814 bprintf(bp, " ipver %u", cmd->arg1); 1815 break; 1816 case O_IPPRECEDENCE: 1817 bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); 1818 break; 1819 case O_DSCP: 1820 print_dscp(bp, insntoc(cmd, u32)); 1821 break; 1822 case O_IPOPT: 1823 print_flags(bp, "ipoptions", cmd, f_ipopts); 1824 break; 1825 case O_IPTOS: 1826 print_flags(bp, "iptos", cmd, f_iptos); 1827 break; 1828 case O_ICMPTYPE: 1829 print_icmptypes(bp, insntoc(cmd, u32)); 1830 break; 1831 case O_ESTAB: 1832 bprintf(bp, " established"); 1833 break; 1834 case O_TCPFLAGS: 1835 print_flags(bp, "tcpflags", cmd, f_tcpflags); 1836 break; 1837 case O_TCPOPTS: 1838 print_flags(bp, "tcpoptions", cmd, f_tcpopts); 1839 break; 1840 case O_TCPACK: 1841 bprintf(bp, " tcpack %d", 1842 ntohl(insntoc(cmd, u32)->d[0])); 1843 break; 1844 case O_TCPSEQ: 1845 bprintf(bp, " tcpseq %d", 1846 ntohl(insntoc(cmd, u32)->d[0])); 1847 break; 1848 case O_UID: 1849 pwd = getpwuid(insntoc(cmd, u32)->d[0]); 1850 if (pwd != NULL) 1851 bprintf(bp, " uid %s", pwd->pw_name); 1852 else 1853 bprintf(bp, " uid %u", 1854 insntoc(cmd, u32)->d[0]); 1855 break; 1856 case O_GID: 1857 grp = getgrgid(insntoc(cmd, u32)->d[0]); 1858 if (grp != NULL) 1859 bprintf(bp, " gid %s", grp->gr_name); 1860 else 1861 bprintf(bp, " gid %u", 1862 insntoc(cmd, u32)->d[0]); 1863 break; 1864 case O_JAIL: 1865 bprintf(bp, " jail %d", insntoc(cmd, u32)->d[0]); 1866 break; 1867 case O_VERREVPATH: 1868 bprintf(bp, " verrevpath"); 1869 break; 1870 case O_VERSRCREACH: 1871 bprintf(bp, " versrcreach"); 1872 break; 1873 case O_ANTISPOOF: 1874 bprintf(bp, " antispoof"); 1875 break; 1876 case O_IPSEC: 1877 bprintf(bp, " ipsec"); 1878 break; 1879 case O_NOP: 1880 bprintf(bp, " // %s", (const char *)(cmd + 1)); 1881 break; 1882 case O_KEEP_STATE: 1883 if (state->flags & HAVE_PROBE_STATE) 1884 bprintf(bp, " keep-state"); 1885 else 1886 bprintf(bp, " record-state"); 1887 bprintf(bp, " :%s", 1888 object_search_ctlv(fo->tstate, 1889 insntoc(cmd, kidx)->kidx, 1890 IPFW_TLV_STATE_NAME)); 1891 break; 1892 case O_LIMIT: 1893 if (state->flags & HAVE_PROBE_STATE) 1894 bprintf(bp, " limit"); 1895 else 1896 bprintf(bp, " set-limit"); 1897 print_limit_mask(bp, insntoc(cmd, limit)); 1898 bprintf(bp, " :%s", 1899 object_search_ctlv(fo->tstate, 1900 insntoc(cmd, kidx)->kidx, 1901 IPFW_TLV_STATE_NAME)); 1902 break; 1903 case O_IP6: 1904 if (state->flags & HAVE_PROTO) 1905 bprintf(bp, " proto"); 1906 bprintf(bp, " ip6"); 1907 break; 1908 case O_IP4: 1909 if (state->flags & HAVE_PROTO) 1910 bprintf(bp, " proto"); 1911 bprintf(bp, " ip4"); 1912 break; 1913 case O_ICMP6TYPE: 1914 print_icmp6types(bp, insntoc(cmd, u32)); 1915 break; 1916 case O_EXT_HDR: 1917 print_ext6hdr(bp, cmd); 1918 break; 1919 case O_TAGGED: 1920 if (F_LEN(cmd) == 1) 1921 bprint_uint_arg(bp, " tagged ", cmd->arg1); 1922 else 1923 print_newports(bp, insntoc(cmd, u16), 1924 0, O_TAGGED); 1925 break; 1926 case O_SKIP_ACTION: 1927 bprintf(bp, " defer-immediate-action"); 1928 break; 1929 case O_MARK: 1930 bprintf(bp, " mark"); 1931 if (cmd->arg1 == IP_FW_TARG) 1932 bprintf(bp, " tablearg"); 1933 else 1934 bprintf(bp, " %#x", insntoc(cmd, u32)->d[0]); 1935 1936 if (insntoc(cmd, u32)->d[1] != 0xFFFFFFFF) 1937 bprintf(bp, ":%#x", insntoc(cmd, u32)->d[1]); 1938 break; 1939 1940 default: 1941 bprintf(bp, " [opcode %d len %d]", cmd->opcode, 1942 cmd->len); 1943 } 1944 if (cmd->len & F_OR) { 1945 bprintf(bp, " or"); 1946 state->or_block = 1; 1947 } else if (state->or_block != 0) { 1948 bprintf(bp, " }"); 1949 state->or_block = 0; 1950 } 1951 mark_printed(state, cmd); 1952 1953 return (1); 1954 } 1955 1956 static ipfw_insn * 1957 print_opcode(struct buf_pr *bp, struct format_opts *fo, 1958 struct show_state *state, int opcode) 1959 { 1960 ipfw_insn *cmd; 1961 int l; 1962 1963 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 1964 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 1965 /* We use zero opcode to print the rest of options */ 1966 if (opcode >= 0 && cmd->opcode != opcode) 1967 continue; 1968 /* 1969 * Skip O_NOP, when we printing the rest 1970 * of options, it will be handled separately. 1971 */ 1972 if (cmd->opcode == O_NOP && opcode != O_NOP) 1973 continue; 1974 if (!print_instruction(bp, fo, state, cmd)) 1975 continue; 1976 return (cmd); 1977 } 1978 return (NULL); 1979 } 1980 1981 static void 1982 print_fwd(struct buf_pr *bp, const ipfw_insn *cmd) 1983 { 1984 char buf[INET6_ADDRSTRLEN + IF_NAMESIZE + 2]; 1985 const ipfw_insn_sa6 *sa6; 1986 const ipfw_insn_sa *sa; 1987 uint16_t port; 1988 1989 if (cmd->opcode == O_FORWARD_IP) { 1990 sa = insntoc(cmd, sa); 1991 port = sa->sa.sin_port; 1992 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 1993 bprintf(bp, "fwd tablearg"); 1994 else 1995 bprintf(bp, "fwd %s", inet_ntoa(sa->sa.sin_addr)); 1996 } else { 1997 sa6 = insntoc(cmd, sa6); 1998 port = sa6->sa.sin6_port; 1999 bprintf(bp, "fwd "); 2000 if (getnameinfo((const struct sockaddr *)&sa6->sa, 2001 sizeof(struct sockaddr_in6), buf, sizeof(buf), NULL, 0, 2002 NI_NUMERICHOST) == 0) 2003 bprintf(bp, "%s", buf); 2004 } 2005 if (port != 0) 2006 bprintf(bp, ",%u", port); 2007 } 2008 2009 static void 2010 print_logdst(struct buf_pr *bp, uint16_t arg1) 2011 { 2012 char const *comma = ""; 2013 2014 bprintf(bp, " logdst "); 2015 if (arg1 & IPFW_LOG_SYSLOG) { 2016 bprintf(bp, "%ssyslog", comma); 2017 comma = ","; 2018 } 2019 if (arg1 & IPFW_LOG_IPFW0) { 2020 bprintf(bp, "%sipfw0", comma); 2021 comma = ","; 2022 } 2023 if (arg1 & IPFW_LOG_RTSOCK) { 2024 bprintf(bp, "%srtsock", comma); 2025 comma = ","; 2026 } 2027 } 2028 2029 static int 2030 print_action_instruction(struct buf_pr *bp, const struct format_opts *fo, 2031 struct show_state *state, const ipfw_insn *cmd) 2032 { 2033 const char *s; 2034 2035 if (is_printed_opcode(state, cmd)) 2036 return (0); 2037 switch (cmd->opcode) { 2038 case O_CHECK_STATE: 2039 bprintf(bp, "check-state"); 2040 if (insntoc(cmd, kidx)->kidx != 0) 2041 s = object_search_ctlv(fo->tstate, 2042 insntoc(cmd, kidx)->kidx, 2043 IPFW_TLV_STATE_NAME); 2044 else 2045 s = NULL; 2046 bprintf(bp, " :%s", s ? s: "any"); 2047 break; 2048 case O_ACCEPT: 2049 bprintf(bp, "allow"); 2050 break; 2051 case O_COUNT: 2052 bprintf(bp, "count"); 2053 break; 2054 case O_DENY: 2055 bprintf(bp, "deny"); 2056 break; 2057 case O_REJECT: 2058 if (cmd->arg1 == ICMP_REJECT_RST) 2059 bprintf(bp, "reset"); 2060 else if (cmd->arg1 == ICMP_REJECT_ABORT) 2061 bprintf(bp, "abort"); 2062 else if (cmd->arg1 == ICMP_UNREACH_HOST) 2063 bprintf(bp, "reject"); 2064 else if (cmd->arg1 == ICMP_UNREACH_NEEDFRAG && 2065 cmd->len == F_INSN_SIZE(ipfw_insn_u16)) 2066 bprintf(bp, "needfrag %u", 2067 insntoc(cmd, u16)->ports[0]); 2068 else 2069 print_reject_code(bp, cmd->arg1); 2070 break; 2071 case O_UNREACH6: 2072 if (cmd->arg1 == ICMP6_UNREACH_RST) 2073 bprintf(bp, "reset6"); 2074 else if (cmd->arg1 == ICMP6_UNREACH_ABORT) 2075 bprintf(bp, "abort6"); 2076 else 2077 print_unreach6_code(bp, cmd->arg1); 2078 break; 2079 case O_SKIPTO: 2080 bprint_uint_arg(bp, "skipto ", insntoc(cmd, u32)->d[0]); 2081 break; 2082 case O_PIPE: 2083 bprint_uint_arg(bp, "pipe ", cmd->arg1); 2084 break; 2085 case O_QUEUE: 2086 bprint_uint_arg(bp, "queue ", cmd->arg1); 2087 break; 2088 case O_DIVERT: 2089 bprint_uint_arg(bp, "divert ", cmd->arg1); 2090 break; 2091 case O_TEE: 2092 bprint_uint_arg(bp, "tee ", cmd->arg1); 2093 break; 2094 case O_NETGRAPH: 2095 bprint_uint_arg(bp, "netgraph ", cmd->arg1); 2096 break; 2097 case O_NGTEE: 2098 bprint_uint_arg(bp, "ngtee ", cmd->arg1); 2099 break; 2100 case O_FORWARD_IP: 2101 case O_FORWARD_IP6: 2102 print_fwd(bp, cmd); 2103 break; 2104 case O_LOG: 2105 bprintf(bp, " log"); 2106 if (insntoc(cmd, log)->max_log > 0) 2107 bprintf(bp, " logamount %d", 2108 insntoc(cmd, log)->max_log); 2109 if (cmd->arg1 != IPFW_LOG_DEFAULT) 2110 print_logdst(bp, cmd->arg1); 2111 break; 2112 case O_ALTQ: 2113 #ifndef NO_ALTQ 2114 print_altq_cmd(bp, insntoc(cmd, altq)); 2115 #endif 2116 break; 2117 case O_TAG: 2118 bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ": 2119 " tag ", cmd->arg1); 2120 break; 2121 case O_NAT: 2122 if (cmd->arg1 != IP_FW_NAT44_GLOBAL) 2123 bprint_uint_arg(bp, "nat ", cmd->arg1); 2124 else 2125 bprintf(bp, "nat global"); 2126 break; 2127 case O_SETFIB: 2128 if (cmd->arg1 == IP_FW_TARG) 2129 bprint_uint_arg(bp, "setfib ", cmd->arg1); 2130 else 2131 bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF); 2132 break; 2133 case O_EXTERNAL_ACTION: 2134 /* 2135 * The external action can consists of two following 2136 * each other opcodes - O_EXTERNAL_ACTION and 2137 * O_EXTERNAL_INSTANCE. The first contains the ID of 2138 * name of external action. The second contains the ID 2139 * of name of external action instance. 2140 * NOTE: in case when external action has no named 2141 * instances support, the second opcode isn't needed. 2142 */ 2143 state->eaction = insntoc(cmd, kidx); 2144 s = object_search_ctlv(fo->tstate, 2145 state->eaction->kidx, 2146 IPFW_TLV_EACTION); 2147 if (match_token(rule_eactions, s) != -1) 2148 bprintf(bp, "%s", s); 2149 else 2150 bprintf(bp, "eaction %s", s); 2151 break; 2152 case O_EXTERNAL_INSTANCE: 2153 if (state->eaction == NULL) 2154 break; 2155 /* 2156 * XXX: we need to teach ipfw(9) to rewrite opcodes 2157 * in the user buffer on rule addition. When we add 2158 * the rule, we specify zero TLV type for 2159 * O_EXTERNAL_INSTANCE object. To show correct 2160 * rule after `ipfw add` we need to search instance 2161 * name with zero type. But when we do `ipfw show` 2162 * we calculate TLV type using IPFW_TLV_EACTION_NAME() 2163 * macro. 2164 */ 2165 s = object_search_ctlv(fo->tstate, 2166 insntoc(cmd, kidx)->kidx, 0); 2167 if (s == NULL) 2168 s = object_search_ctlv(fo->tstate, 2169 insntoc(cmd, kidx)->kidx, IPFW_TLV_EACTION_NAME( 2170 state->eaction->kidx)); 2171 bprintf(bp, " %s", s); 2172 break; 2173 case O_EXTERNAL_DATA: 2174 if (state->eaction == NULL) 2175 break; 2176 /* 2177 * Currently we support data formatting only for 2178 * external data with datalen u16. For unknown data 2179 * print its size in bytes. 2180 */ 2181 if (cmd->len == F_INSN_SIZE(ipfw_insn)) 2182 bprintf(bp, " %u", cmd->arg1); 2183 else 2184 bprintf(bp, " %ubytes", 2185 (unsigned)(cmd->len * sizeof(uint32_t))); 2186 break; 2187 case O_SETDSCP: 2188 if (cmd->arg1 == IP_FW_TARG) { 2189 bprintf(bp, "setdscp tablearg"); 2190 break; 2191 } 2192 s = match_value(f_ipdscp, cmd->arg1 & 0x3F); 2193 if (s != NULL) 2194 bprintf(bp, "setdscp %s", s); 2195 else 2196 bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F); 2197 break; 2198 case O_REASS: 2199 bprintf(bp, "reass"); 2200 break; 2201 case O_CALLRETURN: 2202 if (cmd->len & F_NOT) { 2203 s = match_value(return_types, cmd->arg1); 2204 bprintf(bp, "return %s", s ? s: "<invalid>"); 2205 } else 2206 bprint_uint_arg(bp, "call ", insntoc(cmd, u32)->d[0]); 2207 break; 2208 case O_SETMARK: 2209 if (cmd->arg1 == IP_FW_TARG) { 2210 bprintf(bp, "setmark tablearg"); 2211 break; 2212 } 2213 bprintf(bp, "setmark %#x", insntoc(cmd, u32)->d[0]); 2214 break; 2215 default: 2216 bprintf(bp, "** unrecognized action %d len %d ", 2217 cmd->opcode, cmd->len); 2218 } 2219 mark_printed(state, cmd); 2220 2221 return (1); 2222 } 2223 2224 2225 static ipfw_insn * 2226 print_action(struct buf_pr *bp, struct format_opts *fo, 2227 struct show_state *state, uint8_t opcode) 2228 { 2229 ipfw_insn *cmd; 2230 int l; 2231 2232 for (l = state->rule->cmd_len - state->rule->act_ofs, 2233 cmd = ACTION_PTR(state->rule); l > 0; 2234 l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2235 if (cmd->opcode != opcode) 2236 continue; 2237 if (!print_action_instruction(bp, fo, state, cmd)) 2238 continue; 2239 return (cmd); 2240 } 2241 return (NULL); 2242 } 2243 2244 static void 2245 print_proto(struct buf_pr *bp, struct format_opts *fo, 2246 struct show_state *state) 2247 { 2248 ipfw_insn *cmd; 2249 int l, proto, ip4, ip6; 2250 2251 /* Count all O_PROTO, O_IP4, O_IP6 instructions. */ 2252 proto = ip4 = ip6 = 0; 2253 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2254 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2255 switch (cmd->opcode) { 2256 case O_PROTO: 2257 proto++; 2258 break; 2259 case O_IP4: 2260 ip4 = 1; 2261 if (cmd->len & F_OR) 2262 ip4++; 2263 break; 2264 case O_IP6: 2265 ip6 = 1; 2266 if (cmd->len & F_OR) 2267 ip6++; 2268 break; 2269 default: 2270 continue; 2271 } 2272 } 2273 if (proto == 0 && ip4 == 0 && ip6 == 0) { 2274 state->proto = IPPROTO_IP; 2275 state->flags |= HAVE_PROTO; 2276 bprintf(bp, " ip"); 2277 return; 2278 } 2279 /* To handle the case { ip4 or ip6 }, print opcode with F_OR first */ 2280 cmd = NULL; 2281 if (ip4 || ip6) 2282 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6); 2283 if (cmd != NULL && (cmd->len & F_OR)) 2284 cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4); 2285 if (cmd == NULL || (cmd->len & F_OR)) 2286 for (l = proto; l > 0; l--) { 2287 cmd = print_opcode(bp, fo, state, O_PROTO); 2288 if (cmd == NULL || (cmd->len & F_OR) == 0) 2289 break; 2290 } 2291 /* Initialize proto, it is used by print_newports() */ 2292 state->flags |= HAVE_PROTO; 2293 if (state->proto == 0 && ip6 != 0) 2294 state->proto = IPPROTO_IPV6; 2295 } 2296 2297 static int 2298 match_opcode(int opcode, const int opcodes[], size_t nops) 2299 { 2300 size_t i; 2301 2302 for (i = 0; i < nops; i++) 2303 if (opcode == opcodes[i]) 2304 return (1); 2305 return (0); 2306 } 2307 2308 static void 2309 print_address(struct buf_pr *bp, struct format_opts *fo, 2310 struct show_state *state, const int opcodes[], size_t nops, int portop, 2311 int flag) 2312 { 2313 ipfw_insn *cmd; 2314 int count, l, portcnt, pf; 2315 2316 count = portcnt = 0; 2317 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2318 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2319 if (match_opcode(cmd->opcode, opcodes, nops)) { 2320 /* 2321 * Special handling for O_IP_DST_LOOKUP when 2322 * lookup type is not LOOKUP_NONE. 2323 */ 2324 if (cmd->opcode == O_IP_DST_LOOKUP && 2325 IPFW_LOOKUP_TYPE(cmd) != LOOKUP_NONE) 2326 continue; 2327 count++; 2328 } else if (cmd->opcode == portop) 2329 portcnt++; 2330 } 2331 if (count == 0) 2332 bprintf(bp, " any"); 2333 for (l = state->rule->act_ofs, cmd = state->rule->cmd; 2334 l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2335 if (!match_opcode(cmd->opcode, opcodes, nops)) 2336 continue; 2337 print_instruction(bp, fo, state, cmd); 2338 if ((cmd->len & F_OR) == 0) 2339 break; 2340 count--; 2341 } 2342 /* 2343 * If several O_IP_?PORT opcodes specified, leave them to the 2344 * options section. 2345 */ 2346 if (portcnt == 1) { 2347 for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0; 2348 l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 2349 if (cmd->opcode != portop) { 2350 pf = (cmd->len & F_OR); 2351 continue; 2352 } 2353 /* Print opcode iff it is not in OR block. */ 2354 if (pf == 0 && (cmd->len & F_OR) == 0) 2355 print_instruction(bp, fo, state, cmd); 2356 break; 2357 } 2358 } 2359 state->flags |= flag; 2360 } 2361 2362 static const int action_opcodes[] = { 2363 O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT, 2364 O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE, 2365 O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT, 2366 O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN, O_SETMARK, 2367 /* keep the following opcodes at the end of the list */ 2368 O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA 2369 }; 2370 2371 static const int modifier_opcodes[] = { 2372 O_LOG, O_ALTQ, O_TAG 2373 }; 2374 2375 static const int src_opcodes[] = { 2376 O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME, 2377 O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME 2378 }; 2379 2380 static const int dst_opcodes[] = { 2381 O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME, 2382 O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME 2383 }; 2384 2385 #if IPFW_DEFAULT_RULE > 65535 2386 #define RULENUM_FORMAT "%06d" 2387 #else 2388 #define RULENUM_FORMAT "%05d" 2389 #endif 2390 2391 static void 2392 show_static_rule(struct cmdline_opts *co, struct format_opts *fo, 2393 struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) 2394 { 2395 static int twidth = 0; 2396 struct show_state state; 2397 ipfw_insn *cmd; 2398 size_t i; 2399 2400 /* Print # DISABLED or skip the rule */ 2401 if ((fo->set_mask & (1 << rule->set)) == 0) { 2402 /* disabled mask */ 2403 if (!co->show_sets) 2404 return; 2405 else 2406 bprintf(bp, "# DISABLED "); 2407 } 2408 if (init_show_state(&state, rule) != 0) { 2409 warn("init_show_state() failed"); 2410 return; 2411 } 2412 2413 bprintf(bp, RULENUM_FORMAT " ", rule->rulenum); 2414 2415 /* only if counters are available */ 2416 if (cntr != NULL) { 2417 /* Print counters if enabled */ 2418 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2419 pr_u64(bp, &cntr->pcnt, fo->pcwidth); 2420 pr_u64(bp, &cntr->bcnt, fo->bcwidth); 2421 } 2422 2423 /* Print timestamp */ 2424 if (co->do_time == TIMESTAMP_NUMERIC) 2425 bprintf(bp, "%10u ", cntr->timestamp); 2426 else if (co->do_time == TIMESTAMP_STRING) { 2427 char timestr[30]; 2428 time_t t = (time_t)0; 2429 2430 if (twidth == 0) { 2431 strcpy(timestr, ctime(&t)); 2432 *strchr(timestr, '\n') = '\0'; 2433 twidth = strlen(timestr); 2434 } 2435 if (cntr->timestamp > 0) { 2436 t = _long_to_time(cntr->timestamp); 2437 2438 strcpy(timestr, ctime(&t)); 2439 *strchr(timestr, '\n') = '\0'; 2440 bprintf(bp, "%s ", timestr); 2441 } else { 2442 bprintf(bp, "%*s ", twidth, ""); 2443 } 2444 } 2445 } 2446 2447 /* Print set number */ 2448 if (co->show_sets) 2449 bprintf(bp, "set %d ", rule->set); 2450 2451 /* Print the optional "match probability" */ 2452 cmd = print_opcode(bp, fo, &state, O_PROB); 2453 /* Print rule action */ 2454 for (i = 0; i < nitems(action_opcodes); i++) { 2455 cmd = print_action(bp, fo, &state, action_opcodes[i]); 2456 if (cmd == NULL) 2457 continue; 2458 /* Handle special cases */ 2459 switch (cmd->opcode) { 2460 case O_CHECK_STATE: 2461 goto end; 2462 case O_EXTERNAL_ACTION: 2463 case O_EXTERNAL_INSTANCE: 2464 /* External action can have several instructions */ 2465 continue; 2466 } 2467 break; 2468 } 2469 /* Print rule modifiers */ 2470 for (i = 0; i < nitems(modifier_opcodes); i++) 2471 print_action(bp, fo, &state, modifier_opcodes[i]); 2472 /* 2473 * Print rule body 2474 */ 2475 if (co->comment_only != 0) 2476 goto end; 2477 2478 if (rule->flags & IPFW_RULE_JUSTOPTS) { 2479 state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; 2480 /* 2481 * Print `proto ip` if all opcodes has been already printed. 2482 */ 2483 if (memchr(state.printed, 0, rule->act_ofs) == NULL) { 2484 bprintf(bp, " proto ip"); 2485 goto end; 2486 } 2487 goto justopts; 2488 } 2489 2490 print_proto(bp, fo, &state); 2491 if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT)) 2492 goto justopts; 2493 2494 /* Print source */ 2495 bprintf(bp, " from"); 2496 print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes), 2497 O_IP_SRCPORT, HAVE_SRCIP); 2498 2499 /* Print destination */ 2500 bprintf(bp, " to"); 2501 print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes), 2502 O_IP_DSTPORT, HAVE_DSTIP); 2503 2504 justopts: 2505 /* Print the rest of options */ 2506 while (print_opcode(bp, fo, &state, -1)) 2507 ; 2508 end: 2509 /* Print comment at the end */ 2510 cmd = print_opcode(bp, fo, &state, O_NOP); 2511 if (co->comment_only != 0 && cmd == NULL) 2512 bprintf(bp, " // ..."); 2513 bprintf(bp, "\n"); 2514 free_show_state(&state); 2515 } 2516 2517 static void 2518 show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2519 struct buf_pr *bp, ipfw_dyn_rule *d) 2520 { 2521 struct protoent *pe; 2522 struct in_addr a; 2523 char buf[INET6_ADDRSTRLEN]; 2524 2525 if (!d->expire && !(d->type == O_LIMIT_PARENT)) 2526 return; 2527 2528 bprintf(bp, RULENUM_FORMAT, d->rulenum); 2529 if (fo->pcwidth > 0 || fo->bcwidth > 0) { 2530 bprintf(bp, " "); 2531 pr_u64(bp, &d->pcnt, fo->pcwidth); 2532 pr_u64(bp, &d->bcnt, fo->bcwidth); 2533 bprintf(bp, "(%ds)", d->expire); 2534 } 2535 switch (d->type) { 2536 case O_LIMIT_PARENT: 2537 bprintf(bp, " PARENT %u", d->count); 2538 break; 2539 case O_LIMIT: 2540 bprintf(bp, " LIMIT"); 2541 break; 2542 case O_KEEP_STATE: /* bidir, no mask */ 2543 bprintf(bp, " STATE"); 2544 break; 2545 } 2546 2547 if ((pe = getprotobynumber(d->id.proto)) != NULL) 2548 bprintf(bp, " %s", pe->p_name); 2549 else 2550 bprintf(bp, " proto %u", d->id.proto); 2551 2552 if (d->id.addr_type == 4) { 2553 a.s_addr = htonl(d->id.src_ip); 2554 bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); 2555 2556 a.s_addr = htonl(d->id.dst_ip); 2557 bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); 2558 } else if (d->id.addr_type == 6) { 2559 bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, 2560 sizeof(buf)), d->id.src_port); 2561 bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, 2562 buf, sizeof(buf)), d->id.dst_port); 2563 } else 2564 bprintf(bp, " UNKNOWN <-> UNKNOWN"); 2565 if (d->kidx != 0) 2566 bprintf(bp, " :%s", object_search_ctlv(fo->tstate, 2567 d->kidx, IPFW_TLV_STATE_NAME)); 2568 2569 #define BOTH_SYN (TH_SYN | (TH_SYN << 8)) 2570 #define BOTH_FIN (TH_FIN | (TH_FIN << 8)) 2571 if (co->verbose) { 2572 bprintf(bp, " state 0x%08x%s", d->state, 2573 d->state ? " ": ","); 2574 if (d->state & IPFW_DYN_ORPHANED) 2575 bprintf(bp, "ORPHANED,"); 2576 if ((d->state & BOTH_SYN) == BOTH_SYN) 2577 bprintf(bp, "BOTH_SYN,"); 2578 else { 2579 if (d->state & TH_SYN) 2580 bprintf(bp, "F_SYN,"); 2581 if (d->state & (TH_SYN << 8)) 2582 bprintf(bp, "R_SYN,"); 2583 } 2584 if ((d->state & BOTH_FIN) == BOTH_FIN) 2585 bprintf(bp, "BOTH_FIN,"); 2586 else { 2587 if (d->state & TH_FIN) 2588 bprintf(bp, "F_FIN,"); 2589 if (d->state & (TH_FIN << 8)) 2590 bprintf(bp, "R_FIN,"); 2591 } 2592 bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd, 2593 d->ack_rev); 2594 } 2595 } 2596 2597 static int 2598 do_range_cmd(int cmd, ipfw_range_tlv *rt) 2599 { 2600 ipfw_range_header rh; 2601 size_t sz; 2602 2603 memset(&rh, 0, sizeof(rh)); 2604 memcpy(&rh.range, rt, sizeof(*rt)); 2605 rh.range.head.length = sizeof(*rt); 2606 rh.range.head.type = IPFW_TLV_RANGE; 2607 sz = sizeof(rh); 2608 2609 if (do_get3(cmd, &rh.opheader, &sz) != 0) 2610 return (-1); 2611 /* Save number of matched objects */ 2612 rt->new_set = rh.range.new_set; 2613 return (0); 2614 } 2615 2616 /* 2617 * This one handles all set-related commands 2618 * ipfw set { show | enable | disable } 2619 * ipfw set swap X Y 2620 * ipfw set move X to Y 2621 * ipfw set move rule X to Y 2622 */ 2623 void 2624 ipfw_sets_handler(char *av[]) 2625 { 2626 ipfw_range_tlv rt; 2627 const char *msg; 2628 size_t size; 2629 uint32_t masks[2], rulenum; 2630 int i; 2631 uint8_t cmd; 2632 2633 av++; 2634 memset(&rt, 0, sizeof(rt)); 2635 2636 if (av[0] == NULL) 2637 errx(EX_USAGE, "set needs command"); 2638 if (_substrcmp(*av, "show") == 0) { 2639 struct format_opts fo; 2640 ipfw_cfg_lheader *cfg; 2641 2642 memset(&fo, 0, sizeof(fo)); 2643 if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0) 2644 err(EX_OSERR, "requesting config failed"); 2645 2646 for (i = 0, msg = "disable"; i < RESVD_SET; i++) 2647 if ((cfg->set_mask & (1<<i)) == 0) { 2648 printf("%s %d", msg, i); 2649 msg = ""; 2650 } 2651 msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable"; 2652 for (i = 0; i < RESVD_SET; i++) 2653 if ((cfg->set_mask & (1<<i)) != 0) { 2654 printf("%s %d", msg, i); 2655 msg = ""; 2656 } 2657 printf("\n"); 2658 free(cfg); 2659 } else if (_substrcmp(*av, "swap") == 0) { 2660 av++; 2661 if ( av[0] == NULL || av[1] == NULL ) 2662 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 2663 rt.set = atoi(av[0]); 2664 rt.new_set = atoi(av[1]); 2665 if (!isdigit(*(av[0])) || rt.set > RESVD_SET) 2666 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 2667 if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) 2668 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 2669 i = do_range_cmd(IP_FW_SET_SWAP, &rt); 2670 } else if (_substrcmp(*av, "move") == 0) { 2671 av++; 2672 if (av[0] && _substrcmp(*av, "rule") == 0) { 2673 rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ 2674 cmd = IP_FW_XMOVE; 2675 av++; 2676 } else 2677 cmd = IP_FW_SET_MOVE; /* Move set to new one */ 2678 if (av[0] == NULL || av[1] == NULL || av[2] == NULL || 2679 av[3] != NULL || _substrcmp(av[1], "to") != 0) 2680 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 2681 rulenum = (uint32_t)strtoul(av[0], NULL, 10); 2682 rt.new_set = atoi(av[2]); 2683 if (cmd == IP_FW_XMOVE) { 2684 rt.start_rule = rulenum; 2685 rt.end_rule = rulenum; 2686 } else 2687 rt.set = rulenum; 2688 rt.new_set = atoi(av[2]); 2689 if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || 2690 (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 2691 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 2692 if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET) 2693 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 2694 i = do_range_cmd(cmd, &rt); 2695 if (i < 0) 2696 err(EX_OSERR, "failed to move %s", 2697 cmd == IP_FW_SET_MOVE ? "set": "rule"); 2698 } else if (_substrcmp(*av, "disable") == 0 || 2699 _substrcmp(*av, "enable") == 0 ) { 2700 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; 2701 2702 av++; 2703 masks[0] = masks[1] = 0; 2704 2705 while (av[0]) { 2706 if (isdigit(**av)) { 2707 i = atoi(*av); 2708 if (i < 0 || i > RESVD_SET) 2709 errx(EX_DATAERR, 2710 "invalid set number %d\n", i); 2711 masks[which] |= (1<<i); 2712 } else if (_substrcmp(*av, "disable") == 0) 2713 which = 0; 2714 else if (_substrcmp(*av, "enable") == 0) 2715 which = 1; 2716 else 2717 errx(EX_DATAERR, 2718 "invalid set command %s\n", *av); 2719 av++; 2720 } 2721 if ( (masks[0] & masks[1]) != 0 ) 2722 errx(EX_DATAERR, 2723 "cannot enable and disable the same set\n"); 2724 2725 rt.set = masks[0]; 2726 rt.new_set = masks[1]; 2727 i = do_range_cmd(IP_FW_SET_ENABLE, &rt); 2728 if (i) 2729 warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)"); 2730 } else 2731 errx(EX_USAGE, "invalid set command %s\n", *av); 2732 } 2733 2734 static void 2735 manage_skipto_cache(int op) 2736 { 2737 ipfw_cmd_header req; 2738 2739 memset(&req, 0, sizeof(req)); 2740 req.size = sizeof(req); 2741 req.cmd = op ? SKIPTO_CACHE_ENABLE : SKIPTO_CACHE_DISABLE; 2742 2743 do_set3(IP_FW_SKIPTO_CACHE, &req.opheader, sizeof(req)); 2744 } 2745 2746 void 2747 ipfw_sysctl_handler(char *av[], int which) 2748 { 2749 av++; 2750 2751 if (av[0] == NULL) { 2752 warnx("missing keyword to enable/disable\n"); 2753 } else if (_substrcmp(*av, "firewall") == 0) { 2754 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 2755 &which, sizeof(which)); 2756 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0, 2757 &which, sizeof(which)); 2758 } else if (_substrcmp(*av, "one_pass") == 0) { 2759 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 2760 &which, sizeof(which)); 2761 } else if (_substrcmp(*av, "debug") == 0) { 2762 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 2763 &which, sizeof(which)); 2764 } else if (_substrcmp(*av, "verbose") == 0) { 2765 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 2766 &which, sizeof(which)); 2767 } else if (_substrcmp(*av, "dyn_keepalive") == 0) { 2768 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 2769 &which, sizeof(which)); 2770 } else if (_substrcmp(*av, "skipto_cache") == 0) { 2771 manage_skipto_cache(which); 2772 #ifndef NO_ALTQ 2773 } else if (_substrcmp(*av, "altq") == 0) { 2774 altq_set_enabled(which); 2775 #endif 2776 } else { 2777 warnx("unrecognize enable/disable keyword: %s\n", *av); 2778 } 2779 } 2780 2781 typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo, 2782 void *arg, void *state); 2783 2784 static void 2785 prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo, 2786 void *arg __unused, void *_state) 2787 { 2788 ipfw_dyn_rule *d; 2789 int width; 2790 2791 d = (ipfw_dyn_rule *)_state; 2792 /* Count _ALL_ states */ 2793 fo->dcnt++; 2794 2795 if (fo->show_counters == 0) 2796 return; 2797 2798 /* skip states from another set */ 2799 if (co->use_set != 0 && d->set != co->use_set - 1) 2800 return; 2801 2802 width = pr_u64(NULL, &d->pcnt, 0); 2803 if (width > fo->pcwidth) 2804 fo->pcwidth = width; 2805 2806 width = pr_u64(NULL, &d->bcnt, 0); 2807 if (width > fo->bcwidth) 2808 fo->bcwidth = width; 2809 } 2810 2811 static int 2812 foreach_state(struct cmdline_opts *co, struct format_opts *fo, 2813 caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) 2814 { 2815 int ttype; 2816 state_cb *fptr; 2817 void *farg; 2818 ipfw_obj_tlv *tlv; 2819 ipfw_obj_ctlv *ctlv; 2820 2821 fptr = NULL; 2822 ttype = 0; 2823 2824 while (sz > 0) { 2825 ctlv = (ipfw_obj_ctlv *)base; 2826 switch (ctlv->head.type) { 2827 case IPFW_TLV_DYNSTATE_LIST: 2828 base += sizeof(*ctlv); 2829 sz -= sizeof(*ctlv); 2830 ttype = IPFW_TLV_DYN_ENT; 2831 fptr = dyn_bc; 2832 farg = dyn_arg; 2833 break; 2834 default: 2835 return (sz); 2836 } 2837 2838 while (sz > 0) { 2839 tlv = (ipfw_obj_tlv *)base; 2840 if (tlv->type != ttype) 2841 break; 2842 2843 fptr(co, fo, farg, tlv + 1); 2844 sz -= tlv->length; 2845 base += tlv->length; 2846 } 2847 } 2848 2849 return (sz); 2850 } 2851 2852 static void 2853 prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, 2854 ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) 2855 { 2856 int bcwidth, pcwidth, width; 2857 int n; 2858 struct ip_fw_bcounter *cntr; 2859 struct ip_fw_rule *r; 2860 2861 bcwidth = 0; 2862 pcwidth = 0; 2863 if (fo->show_counters != 0) { 2864 for (n = 0; n < rcnt; n++, 2865 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2866 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2867 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2868 /* skip rules from another set */ 2869 if (co->use_set && r->set != co->use_set - 1) 2870 continue; 2871 2872 /* packet counter */ 2873 width = pr_u64(NULL, &cntr->pcnt, 0); 2874 if (width > pcwidth) 2875 pcwidth = width; 2876 2877 /* byte counter */ 2878 width = pr_u64(NULL, &cntr->bcnt, 0); 2879 if (width > bcwidth) 2880 bcwidth = width; 2881 } 2882 } 2883 fo->bcwidth = bcwidth; 2884 fo->pcwidth = pcwidth; 2885 2886 fo->dcnt = 0; 2887 if (co->do_dynamic && dynsz > 0) 2888 foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); 2889 } 2890 2891 static int 2892 list_static_range(struct cmdline_opts *co, struct format_opts *fo, 2893 struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) 2894 { 2895 int n, seen; 2896 struct ip_fw_rule *r; 2897 struct ip_fw_bcounter *cntr; 2898 2899 for (n = seen = 0; n < rcnt; n++, 2900 rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { 2901 2902 if ((fo->show_counters | fo->show_time) != 0) { 2903 cntr = (struct ip_fw_bcounter *)(rtlv + 1); 2904 r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); 2905 } else { 2906 cntr = NULL; 2907 r = (struct ip_fw_rule *)(rtlv + 1); 2908 } 2909 if (r->rulenum > fo->last) 2910 break; 2911 if (co->use_set && r->set != co->use_set - 1) 2912 continue; 2913 if (r->rulenum >= fo->first && r->rulenum <= fo->last) { 2914 show_static_rule(co, fo, bp, r, cntr); 2915 printf("%s", bp->buf); 2916 bp_flush(bp); 2917 seen++; 2918 } 2919 } 2920 2921 return (seen); 2922 } 2923 2924 static void 2925 list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, 2926 void *_arg, void *_state) 2927 { 2928 ipfw_dyn_rule *d; 2929 struct buf_pr *bp; 2930 2931 d = (ipfw_dyn_rule *)_state; 2932 bp = (struct buf_pr *)_arg; 2933 2934 if (d->rulenum > fo->last) 2935 return; 2936 if (co->use_set != 0 && d->set != co->use_set - 1) 2937 return; 2938 if (d->rulenum >= fo->first) { 2939 show_dyn_state(co, fo, bp, d); 2940 printf("%s\n", bp->buf); 2941 bp_flush(bp); 2942 } 2943 } 2944 2945 static int 2946 list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, 2947 struct buf_pr *bp, caddr_t base, size_t sz) 2948 { 2949 2950 sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); 2951 return (sz); 2952 } 2953 2954 void 2955 ipfw_list(int ac, char *av[], int show_counters) 2956 { 2957 ipfw_cfg_lheader *cfg; 2958 struct format_opts sfo; 2959 size_t sz; 2960 int error; 2961 int lac; 2962 char **lav; 2963 uint32_t rnum; 2964 char *endptr; 2965 2966 if (g_co.test_only) { 2967 fprintf(stderr, "Testing only, list disabled\n"); 2968 return; 2969 } 2970 if (g_co.do_pipe) { 2971 dummynet_list(ac, av, show_counters); 2972 return; 2973 } 2974 2975 ac--; 2976 av++; 2977 memset(&sfo, 0, sizeof(sfo)); 2978 2979 /* Determine rule range to request */ 2980 if (ac > 0) { 2981 for (lac = ac, lav = av; lac != 0; lac--) { 2982 rnum = strtoul(*lav++, &endptr, 10); 2983 if (sfo.first == 0 || rnum < sfo.first) 2984 sfo.first = rnum; 2985 2986 if (*endptr == '-') 2987 rnum = strtoul(endptr + 1, &endptr, 10); 2988 if (sfo.last == 0 || rnum > sfo.last) 2989 sfo.last = rnum; 2990 } 2991 } 2992 2993 /* get configuration from kernel */ 2994 cfg = NULL; 2995 sfo.show_counters = show_counters; 2996 sfo.show_time = g_co.do_time; 2997 if (g_co.do_dynamic != 2) 2998 sfo.flags |= IPFW_CFG_GET_STATIC; 2999 if (g_co.do_dynamic != 0) 3000 sfo.flags |= IPFW_CFG_GET_STATES; 3001 if ((sfo.show_counters | sfo.show_time) != 0) 3002 sfo.flags |= IPFW_CFG_GET_COUNTERS; 3003 if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0) 3004 err(EX_OSERR, "retrieving config failed"); 3005 3006 error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av); 3007 3008 free(cfg); 3009 3010 if (error != EX_OK) 3011 exit(error); 3012 } 3013 3014 static int 3015 ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, 3016 ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) 3017 { 3018 caddr_t dynbase; 3019 size_t dynsz; 3020 int rcnt; 3021 int exitval = EX_OK; 3022 int lac; 3023 char **lav; 3024 char *endptr; 3025 size_t readsz; 3026 struct buf_pr bp; 3027 ipfw_obj_ctlv *ctlv; 3028 ipfw_obj_tlv *rbase; 3029 3030 /* 3031 * Handle tablenames TLV first, if any 3032 */ 3033 rbase = NULL; 3034 dynbase = NULL; 3035 dynsz = 0; 3036 readsz = sizeof(*cfg); 3037 rcnt = 0; 3038 3039 fo->set_mask = cfg->set_mask; 3040 3041 ctlv = (ipfw_obj_ctlv *)(cfg + 1); 3042 if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { 3043 object_sort_ctlv(ctlv); 3044 fo->tstate = ctlv; 3045 readsz += ctlv->head.length; 3046 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 3047 } 3048 3049 if (cfg->flags & IPFW_CFG_GET_STATIC) { 3050 /* We've requested static rules */ 3051 if (ctlv->head.type == IPFW_TLV_RULE_LIST) { 3052 rbase = (ipfw_obj_tlv *)(ctlv + 1); 3053 rcnt = ctlv->count; 3054 readsz += ctlv->head.length; 3055 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + 3056 ctlv->head.length); 3057 } 3058 } 3059 3060 if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) { 3061 /* We may have some dynamic states */ 3062 dynsz = sz - readsz; 3063 /* Skip empty header */ 3064 if (dynsz != sizeof(ipfw_obj_ctlv)) 3065 dynbase = (caddr_t)ctlv; 3066 else 3067 dynsz = 0; 3068 } 3069 3070 prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); 3071 bp_alloc(&bp, 4096); 3072 3073 /* if no rule numbers were specified, list all rules */ 3074 if (ac == 0) { 3075 fo->first = 0; 3076 fo->last = IPFW_DEFAULT_RULE; 3077 if (cfg->flags & IPFW_CFG_GET_STATIC) 3078 list_static_range(co, fo, &bp, rbase, rcnt); 3079 3080 if (co->do_dynamic && dynsz > 0) { 3081 printf("## Dynamic rules (%d %zu):\n", fo->dcnt, 3082 dynsz); 3083 list_dyn_range(co, fo, &bp, dynbase, dynsz); 3084 } 3085 3086 bp_free(&bp); 3087 return (EX_OK); 3088 } 3089 3090 /* display specific rules requested on command line */ 3091 for (lac = ac, lav = av; lac != 0; lac--) { 3092 /* convert command line rule # */ 3093 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 3094 if (*endptr == '-') 3095 fo->last = strtoul(endptr + 1, &endptr, 10); 3096 if (*endptr) { 3097 exitval = EX_USAGE; 3098 warnx("invalid rule number: %s", *(lav - 1)); 3099 continue; 3100 } 3101 3102 if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0) 3103 continue; 3104 3105 if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { 3106 /* give precedence to other error(s) */ 3107 if (exitval == EX_OK) 3108 exitval = EX_UNAVAILABLE; 3109 if (fo->first == fo->last) 3110 warnx("rule %u does not exist", fo->first); 3111 else 3112 warnx("no rules in range %u-%u", 3113 fo->first, fo->last); 3114 } 3115 } 3116 3117 if (co->do_dynamic && dynsz > 0) { 3118 printf("## Dynamic rules:\n"); 3119 for (lac = ac, lav = av; lac != 0; lac--) { 3120 fo->last = fo->first = strtoul(*lav++, &endptr, 10); 3121 if (*endptr == '-') 3122 fo->last = strtoul(endptr+1, &endptr, 10); 3123 if (*endptr) 3124 /* already warned */ 3125 continue; 3126 list_dyn_range(co, fo, &bp, dynbase, dynsz); 3127 } 3128 } 3129 3130 bp_free(&bp); 3131 return (exitval); 3132 } 3133 3134 3135 /* 3136 * Retrieves current ipfw configuration of given type 3137 * and stores its pointer to @pcfg. 3138 * 3139 * Caller is responsible for freeing @pcfg. 3140 * 3141 * Returns 0 on success. 3142 */ 3143 3144 static int 3145 ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, 3146 ipfw_cfg_lheader **pcfg, size_t *psize) 3147 { 3148 ipfw_cfg_lheader *cfg; 3149 size_t sz; 3150 int i; 3151 3152 3153 if (co->test_only != 0) { 3154 fprintf(stderr, "Testing only, list disabled\n"); 3155 return (0); 3156 } 3157 3158 /* Start with some data size */ 3159 sz = 4096; 3160 cfg = NULL; 3161 3162 for (i = 0; i < 16; i++) { 3163 if (cfg != NULL) 3164 free(cfg); 3165 if ((cfg = calloc(1, sz)) == NULL) 3166 return (ENOMEM); 3167 3168 cfg->flags = fo->flags; 3169 cfg->start_rule = fo->first; 3170 cfg->end_rule = fo->last; 3171 3172 if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) { 3173 if (errno != ENOMEM) { 3174 free(cfg); 3175 return (errno); 3176 } 3177 3178 /* Buffer size is not enough. Try to increase */ 3179 sz = sz * 2; 3180 if (sz < cfg->size) 3181 sz = cfg->size; 3182 continue; 3183 } 3184 3185 *pcfg = cfg; 3186 *psize = sz; 3187 return (0); 3188 } 3189 3190 free(cfg); 3191 return (ENOMEM); 3192 } 3193 3194 static int 3195 lookup_host (char *host, struct in_addr *ipaddr) 3196 { 3197 struct hostent *he; 3198 3199 if (!inet_aton(host, ipaddr)) { 3200 if ((he = gethostbyname(host)) == NULL) 3201 return(-1); 3202 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 3203 } 3204 return(0); 3205 } 3206 3207 struct tidx { 3208 ipfw_obj_ntlv *idx; 3209 uint32_t count; 3210 uint32_t size; 3211 uint16_t counter; 3212 uint8_t set; 3213 }; 3214 3215 int 3216 ipfw_check_object_name(const char *name) 3217 { 3218 int c, i, l; 3219 3220 /* 3221 * Check that name is null-terminated and contains 3222 * valid symbols only. Valid mask is: 3223 * [a-zA-Z0-9\-_\.]{1,63} 3224 */ 3225 l = strlen(name); 3226 if (l == 0 || l >= 64) 3227 return (EINVAL); 3228 for (i = 0; i < l; i++) { 3229 c = name[i]; 3230 if (isalpha(c) || isdigit(c) || c == '_' || 3231 c == '-' || c == '.') 3232 continue; 3233 return (EINVAL); 3234 } 3235 return (0); 3236 } 3237 3238 static const char *default_state_name = "default"; 3239 3240 static int 3241 state_check_name(const char *name) 3242 { 3243 3244 if (ipfw_check_object_name(name) != 0) 3245 return (EINVAL); 3246 if (strcmp(name, "any") == 0) 3247 return (EINVAL); 3248 return (0); 3249 } 3250 3251 static int 3252 eaction_check_name(const char *name) 3253 { 3254 3255 if (ipfw_check_object_name(name) != 0) 3256 return (EINVAL); 3257 /* Restrict some 'special' names */ 3258 if (match_token(rule_actions, name) != -1 && 3259 match_token(rule_action_params, name) != -1) 3260 return (EINVAL); 3261 return (0); 3262 } 3263 3264 static uint32_t 3265 pack_object(struct tidx *tstate, const char *name, int otype) 3266 { 3267 ipfw_obj_ntlv *ntlv; 3268 uint32_t i; 3269 3270 for (i = 0; i < tstate->count; i++) { 3271 if (strcmp(tstate->idx[i].name, name) != 0) 3272 continue; 3273 if (tstate->idx[i].set != tstate->set) 3274 continue; 3275 if (tstate->idx[i].head.type != otype) 3276 continue; 3277 3278 return (tstate->idx[i].idx); 3279 } 3280 3281 if (tstate->count + 1 > tstate->size) { 3282 tstate->size += 4; 3283 tstate->idx = realloc(tstate->idx, tstate->size * 3284 sizeof(ipfw_obj_ntlv)); 3285 if (tstate->idx == NULL) 3286 return (0); 3287 } 3288 3289 ntlv = &tstate->idx[i]; 3290 memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); 3291 strlcpy(ntlv->name, name, sizeof(ntlv->name)); 3292 ntlv->head.type = otype; 3293 ntlv->head.length = sizeof(ipfw_obj_ntlv); 3294 ntlv->set = tstate->set; 3295 ntlv->idx = ++tstate->counter; 3296 tstate->count++; 3297 3298 return (ntlv->idx); 3299 } 3300 3301 static uint32_t 3302 pack_table(struct tidx *tstate, const char *name) 3303 { 3304 3305 if (table_check_name(name) != 0) 3306 return (0); 3307 3308 return (pack_object(tstate, name, IPFW_TLV_TBL_NAME)); 3309 } 3310 3311 static void 3312 fill_table_value(ipfw_insn *cmd, char *s) 3313 { 3314 char *p; 3315 int i; 3316 3317 p = strchr(s, '='); 3318 if (p != NULL) { 3319 *p++ = '\0'; 3320 i = match_token(tvalue_names, s); 3321 if (i == -1) 3322 errx(EX_USAGE, 3323 "format: unknown table value name %s", s); 3324 } else { 3325 i = TVALUE_TAG; 3326 p = s; 3327 } 3328 3329 IPFW_SET_TVALUE_TYPE(cmd, i); 3330 insntod(cmd, table)->value = strtoul(p, NULL, 0); 3331 } 3332 3333 void 3334 fill_table(ipfw_insn *cmd, char *av, uint8_t opcode, struct tidx *tstate) 3335 { 3336 ipfw_insn_kidx *c = insntod(cmd, kidx); 3337 char *p; 3338 3339 if ((p = strchr(av + 6, ')')) == NULL) 3340 errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); 3341 *p = '\0'; 3342 p = strchr(av + 6, ','); 3343 if (p) 3344 *p++ = '\0'; 3345 3346 if ((c->kidx = pack_table(tstate, av + 6)) == 0) 3347 errx(EX_DATAERR, "Invalid table name: %s", av + 6); 3348 3349 cmd->opcode = opcode; 3350 if (p) { 3351 cmd->len |= F_INSN_SIZE(ipfw_insn_table); 3352 fill_table_value(cmd, p); 3353 } else { 3354 IPFW_SET_LOOKUP_TYPE(cmd, LOOKUP_NONE); 3355 cmd->len |= F_INSN_SIZE(ipfw_insn_kidx); 3356 } 3357 } 3358 3359 /* 3360 * fills the addr and mask fields in the instruction as appropriate from av. 3361 * Update length as appropriate. 3362 * The following formats are allowed: 3363 * me returns O_IP_*_ME 3364 * 1.2.3.4 single IP address 3365 * 1.2.3.4:5.6.7.8 address:mask 3366 * 1.2.3.4/24 address/mask 3367 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 3368 * We can have multiple comma-separated address/mask entries. 3369 */ 3370 static void 3371 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate) 3372 { 3373 int len = 0; 3374 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 3375 3376 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 3377 3378 if (_substrcmp(av, "any") == 0) 3379 return; 3380 3381 if (_substrcmp(av, "me") == 0) { 3382 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 3383 return; 3384 } 3385 3386 if (strncmp(av, "table(", 6) == 0) { 3387 fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 3388 return; 3389 } 3390 3391 while (av) { 3392 /* 3393 * After the address we can have '/' or ':' indicating a mask, 3394 * ',' indicating another address follows, '{' indicating a 3395 * set of addresses of unspecified size. 3396 */ 3397 char *t = NULL, *p = strpbrk(av, "/:,{"); 3398 int masklen; 3399 char md, nd = '\0'; 3400 3401 CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len); 3402 3403 if (p) { 3404 md = *p; 3405 *p++ = '\0'; 3406 if ((t = strpbrk(p, ",{")) != NULL) { 3407 nd = *t; 3408 *t = '\0'; 3409 } 3410 } else 3411 md = '\0'; 3412 3413 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 3414 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 3415 switch (md) { 3416 case ':': 3417 if (!inet_aton(p, (struct in_addr *)&d[1])) 3418 errx(EX_DATAERR, "bad netmask ``%s''", p); 3419 break; 3420 case '/': 3421 masklen = atoi(p); 3422 if (masklen == 0) 3423 d[1] = htonl(0U); /* mask */ 3424 else if (masklen > 32) 3425 errx(EX_DATAERR, "bad width ``%s''", p); 3426 else 3427 d[1] = htonl(~0U << (32 - masklen)); 3428 break; 3429 case '{': /* no mask, assume /24 and put back the '{' */ 3430 d[1] = htonl(~0U << (32 - 24)); 3431 *(--p) = md; 3432 break; 3433 3434 case ',': /* single address plus continuation */ 3435 *(--p) = md; 3436 /* FALLTHROUGH */ 3437 case 0: /* initialization value */ 3438 default: 3439 d[1] = htonl(~0U); /* force /32 */ 3440 break; 3441 } 3442 d[0] &= d[1]; /* mask base address with mask */ 3443 if (t) 3444 *t = nd; 3445 /* find next separator */ 3446 if (p) 3447 p = strpbrk(p, ",{"); 3448 if (p && *p == '{') { 3449 /* 3450 * We have a set of addresses. They are stored as follows: 3451 * arg1 is the set size (powers of 2, 2..256) 3452 * addr is the base address IN HOST FORMAT 3453 * mask.. is an array of arg1 bits (rounded up to 3454 * the next multiple of 32) with bits set 3455 * for each host in the map. 3456 */ 3457 uint32_t *map = (uint32_t *)&cmd->mask; 3458 int low, high; 3459 int i = contigmask((uint8_t *)&(d[1]), 32); 3460 3461 if (len > 0) 3462 errx(EX_DATAERR, "address set cannot be in a list"); 3463 if (i < 24 || i > 31) 3464 errx(EX_DATAERR, "invalid set with mask %d\n", i); 3465 cmd->o.arg1 = 1<<(32-i); /* map length */ 3466 d[0] = ntohl(d[0]); /* base addr in host format */ 3467 cmd->o.opcode = O_IP_DST_SET; /* default */ 3468 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 3469 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 3470 map[i] = 0; /* clear map */ 3471 3472 av = p + 1; 3473 low = d[0] & 0xff; 3474 high = low + cmd->o.arg1 - 1; 3475 /* 3476 * Here, i stores the previous value when we specify a range 3477 * of addresses within a mask, e.g. 45-63. i = -1 means we 3478 * have no previous value. 3479 */ 3480 i = -1; /* previous value in a range */ 3481 while (isdigit(*av)) { 3482 char *s; 3483 int a = strtol(av, &s, 0); 3484 3485 if (s == av) { /* no parameter */ 3486 if (*av != '}') 3487 errx(EX_DATAERR, "set not closed\n"); 3488 if (i != -1) 3489 errx(EX_DATAERR, "incomplete range %d-", i); 3490 break; 3491 } 3492 if (a < low || a > high) 3493 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 3494 a, low, high); 3495 a -= low; 3496 if (i == -1) /* no previous in range */ 3497 i = a; 3498 else { /* check that range is valid */ 3499 if (i > a) 3500 errx(EX_DATAERR, "invalid range %d-%d", 3501 i+low, a+low); 3502 if (*s == '-') 3503 errx(EX_DATAERR, "double '-' in range"); 3504 } 3505 for (; i <= a; i++) 3506 map[i/32] |= 1<<(i & 31); 3507 i = -1; 3508 if (*s == '-') 3509 i = a; 3510 else if (*s == '}') 3511 break; 3512 av = s+1; 3513 } 3514 return; 3515 } 3516 av = p; 3517 if (av) /* then *av must be a ',' */ 3518 av++; 3519 3520 /* Check this entry */ 3521 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 3522 /* 3523 * 'any' turns the entire list into a NOP. 3524 * 'not any' never matches, so it is removed from the 3525 * list unless it is the only item, in which case we 3526 * report an error. 3527 */ 3528 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 3529 if (av == NULL && len == 0) /* only this entry */ 3530 errx(EX_DATAERR, "not any never matches"); 3531 } 3532 /* else do nothing and skip this entry */ 3533 return; 3534 } 3535 /* A single IP can be stored in an optimized format */ 3536 if (d[1] == (uint32_t)~0 && av == NULL && len == 0) { 3537 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 3538 return; 3539 } 3540 len += 2; /* two words... */ 3541 d += 2; 3542 } /* end while */ 3543 if (len + 1 > F_LEN_MASK) 3544 errx(EX_DATAERR, "address list too long"); 3545 cmd->o.len |= len+1; 3546 } 3547 3548 3549 /* n2mask sets n bits of the mask */ 3550 void 3551 n2mask(struct in6_addr *mask, int n) 3552 { 3553 static int minimask[9] = 3554 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 3555 u_char *p; 3556 3557 memset(mask, 0, sizeof(struct in6_addr)); 3558 p = (u_char *) mask; 3559 for (; n > 0; p++, n -= 8) { 3560 if (n >= 8) 3561 *p = 0xff; 3562 else 3563 *p = minimask[n]; 3564 } 3565 return; 3566 } 3567 3568 static void 3569 fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, 3570 struct _s_x *flags, char *p) 3571 { 3572 char *e; 3573 uint32_t set = 0, clear = 0; 3574 3575 if (fill_flags(flags, p, &e, &set, &clear) != 0) 3576 errx(EX_DATAERR, "invalid flag %s", e); 3577 3578 cmd->opcode = opcode; 3579 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 3580 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 3581 } 3582 3583 3584 void 3585 ipfw_delete(char *av[]) 3586 { 3587 ipfw_range_tlv rt; 3588 char *sep; 3589 uint32_t i, j; 3590 int exitval = EX_OK; 3591 int do_set = 0; 3592 3593 av++; 3594 NEED1("missing rule specification"); 3595 if ( *av && _substrcmp(*av, "set") == 0) { 3596 /* Do not allow using the following syntax: 3597 * ipfw set N delete set M 3598 */ 3599 if (g_co.use_set) 3600 errx(EX_DATAERR, "invalid syntax"); 3601 do_set = 1; /* delete set */ 3602 av++; 3603 } 3604 3605 /* Rule number */ 3606 while (*av && isdigit(**av)) { 3607 i = strtol(*av, &sep, 10); 3608 j = i; 3609 if (*sep== '-') 3610 j = strtol(sep + 1, NULL, 10); 3611 av++; 3612 if (g_co.do_nat) { 3613 exitval = ipfw_delete_nat(i); 3614 } else if (g_co.do_pipe) { 3615 exitval = ipfw_delete_pipe(g_co.do_pipe, i); 3616 } else { 3617 memset(&rt, 0, sizeof(rt)); 3618 if (do_set != 0) { 3619 rt.set = i & 31; 3620 rt.flags = IPFW_RCFLAG_SET; 3621 } else { 3622 rt.start_rule = i; 3623 rt.end_rule = j; 3624 if (rt.start_rule == 0 && rt.end_rule == 0) 3625 rt.flags |= IPFW_RCFLAG_ALL; 3626 else 3627 rt.flags |= IPFW_RCFLAG_RANGE; 3628 if (g_co.use_set != 0) { 3629 rt.set = g_co.use_set - 1; 3630 rt.flags |= IPFW_RCFLAG_SET; 3631 } 3632 } 3633 if (g_co.do_dynamic == 2) 3634 rt.flags |= IPFW_RCFLAG_DYNAMIC; 3635 i = do_range_cmd(IP_FW_XDEL, &rt); 3636 if (i != 0) { 3637 exitval = EX_UNAVAILABLE; 3638 if (g_co.do_quiet) 3639 continue; 3640 warn("rule %u: setsockopt(IP_FW_XDEL)", 3641 rt.start_rule); 3642 } else if (rt.new_set == 0 && do_set == 0 && 3643 g_co.do_dynamic != 2) { 3644 exitval = EX_UNAVAILABLE; 3645 if (g_co.do_quiet) 3646 continue; 3647 if (rt.start_rule != rt.end_rule) 3648 warnx("no rules in %u-%u range", 3649 rt.start_rule, rt.end_rule); 3650 else 3651 warnx("rule %u not found", 3652 rt.start_rule); 3653 } 3654 } 3655 } 3656 if (exitval != EX_OK && g_co.do_force == 0) 3657 exit(exitval); 3658 } 3659 3660 /* 3661 * fill the interface structure. We do not check the name as we can 3662 * create interfaces dynamically, so checking them at insert time 3663 * makes relatively little sense. 3664 * Interface names containing '*', '?', or '[' are assumed to be shell 3665 * patterns which match interfaces. 3666 */ 3667 static void 3668 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate) 3669 { 3670 char *p; 3671 uint32_t uidx; 3672 3673 cmd->name[0] = '\0'; 3674 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 3675 3676 CHECK_CMDLEN; 3677 3678 /* Parse the interface or address */ 3679 if (strcmp(arg, "any") == 0) 3680 cmd->o.len = 0; /* effectively ignore this command */ 3681 else if (strncmp(arg, "table(", 6) == 0) { 3682 if ((p = strchr(arg + 6, ')')) == NULL) 3683 errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); 3684 *p = '\0'; 3685 p = strchr(arg + 6, ','); 3686 if (p) 3687 *p++ = '\0'; 3688 if ((uidx = pack_table(tstate, arg + 6)) == 0) 3689 errx(EX_DATAERR, "Invalid table name: %s", arg + 6); 3690 3691 cmd->name[0] = '\1'; /* Special value indicating table */ 3692 cmd->p.kidx = uidx; 3693 } else if (!isdigit(*arg)) { 3694 strlcpy(cmd->name, arg, sizeof(cmd->name)); 3695 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 3696 } else if (!inet_aton(arg, &cmd->p.ip)) 3697 errx(EX_DATAERR, "bad ip address ``%s''", arg); 3698 } 3699 3700 static void 3701 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) 3702 { 3703 int i; 3704 size_t l; 3705 char *ap, *ptr, *optr; 3706 struct ether_addr *mac; 3707 const char *macset = "0123456789abcdefABCDEF:"; 3708 3709 if (strcmp(p, "any") == 0) { 3710 for (i = 0; i < ETHER_ADDR_LEN; i++) 3711 addr[i] = mask[i] = 0; 3712 return; 3713 } 3714 3715 optr = ptr = strdup(p); 3716 if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { 3717 l = strlen(ap); 3718 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) 3719 errx(EX_DATAERR, "Incorrect MAC address"); 3720 bcopy(mac, addr, ETHER_ADDR_LEN); 3721 } else 3722 errx(EX_DATAERR, "Incorrect MAC address"); 3723 3724 if (ptr != NULL) { /* we have mask? */ 3725 if (p[ptr - optr - 1] == '/') { /* mask len */ 3726 long ml = strtol(ptr, &ap, 10); 3727 if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) 3728 errx(EX_DATAERR, "Incorrect mask length"); 3729 for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) 3730 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); 3731 } else { /* mask */ 3732 l = strlen(ptr); 3733 if (strspn(ptr, macset) != l || 3734 (mac = ether_aton(ptr)) == NULL) 3735 errx(EX_DATAERR, "Incorrect mask"); 3736 bcopy(mac, mask, ETHER_ADDR_LEN); 3737 } 3738 } else { /* default mask: ff:ff:ff:ff:ff:ff */ 3739 for (i = 0; i < ETHER_ADDR_LEN; i++) 3740 mask[i] = 0xff; 3741 } 3742 for (i = 0; i < ETHER_ADDR_LEN; i++) 3743 addr[i] &= mask[i]; 3744 3745 free(optr); 3746 } 3747 3748 /* 3749 * helper function, updates the pointer to cmd with the length 3750 * of the current command, and also cleans up the first word of 3751 * the new command in case it has been clobbered before. 3752 */ 3753 static ipfw_insn * 3754 next_cmd(ipfw_insn *cmd, int *len) 3755 { 3756 *len -= F_LEN(cmd); 3757 CHECK_LENGTH(*len, 0); 3758 cmd += F_LEN(cmd); 3759 bzero(cmd, sizeof(*cmd)); 3760 return cmd; 3761 } 3762 3763 /* 3764 * Takes arguments and copies them into a comment 3765 */ 3766 static void 3767 fill_comment(ipfw_insn *cmd, char **av, int cblen) 3768 { 3769 int i, l; 3770 char *p = (char *)(cmd + 1); 3771 3772 cmd->opcode = O_NOP; 3773 cmd->len = (cmd->len & (F_NOT | F_OR)); 3774 3775 /* Compute length of comment string. */ 3776 for (i = 0, l = 0; av[i] != NULL; i++) 3777 l += strlen(av[i]) + 1; 3778 if (l == 0) 3779 return; 3780 if (l > 84) 3781 errx(EX_DATAERR, 3782 "comment too long (max 80 chars)"); 3783 l = 1 + (l+3)/4; 3784 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 3785 CHECK_CMDLEN; 3786 3787 for (i = 0; av[i] != NULL; i++) { 3788 strcpy(p, av[i]); 3789 p += strlen(av[i]); 3790 *p++ = ' '; 3791 } 3792 *(--p) = '\0'; 3793 } 3794 3795 /* 3796 * A function to fill simple commands of size 1. 3797 * Existing flags are preserved. 3798 */ 3799 static void 3800 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 3801 { 3802 cmd->opcode = opcode; 3803 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 3804 cmd->arg1 = arg; 3805 } 3806 3807 /* 3808 * Fetch and add the MAC address and type, with masks. This generates one or 3809 * two microinstructions, and returns the pointer to the last one. 3810 */ 3811 static ipfw_insn * 3812 add_mac(ipfw_insn *cmd, char *av[], int cblen) 3813 { 3814 ipfw_insn_mac *mac; 3815 3816 if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) 3817 errx(EX_DATAERR, "MAC dst src"); 3818 3819 cmd->opcode = O_MACADDR2; 3820 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 3821 CHECK_CMDLEN; 3822 3823 mac = (ipfw_insn_mac *)cmd; 3824 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 3825 get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), 3826 &(mac->mask[ETHER_ADDR_LEN])); /* src */ 3827 return cmd; 3828 } 3829 3830 static ipfw_insn * 3831 add_mactype(ipfw_insn *cmd, char *av, int cblen) 3832 { 3833 if (!av) 3834 errx(EX_DATAERR, "missing MAC type"); 3835 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 3836 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE, 3837 cblen); 3838 cmd->opcode = O_MAC_TYPE; 3839 return cmd; 3840 } else 3841 return NULL; 3842 } 3843 3844 static ipfw_insn * 3845 add_proto0(ipfw_insn *cmd, char *av, u_char *protop) 3846 { 3847 struct protoent *pe; 3848 char *ep; 3849 int proto; 3850 3851 proto = strtol(av, &ep, 10); 3852 if (*ep != '\0' || proto <= 0) { 3853 if ((pe = getprotobyname(av)) == NULL) 3854 return NULL; 3855 proto = pe->p_proto; 3856 } 3857 3858 fill_cmd(cmd, O_PROTO, 0, proto); 3859 *protop = proto; 3860 return cmd; 3861 } 3862 3863 static ipfw_insn * 3864 add_proto(ipfw_insn *cmd, char *av, u_char *protop) 3865 { 3866 u_char proto = IPPROTO_IP; 3867 3868 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3869 ; /* do not set O_IP4 nor O_IP6 */ 3870 else if (strcmp(av, "ip4") == 0) 3871 /* explicit "just IPv4" rule */ 3872 fill_cmd(cmd, O_IP4, 0, 0); 3873 else if (strcmp(av, "ip6") == 0) { 3874 /* explicit "just IPv6" rule */ 3875 proto = IPPROTO_IPV6; 3876 fill_cmd(cmd, O_IP6, 0, 0); 3877 } else 3878 return add_proto0(cmd, av, protop); 3879 3880 *protop = proto; 3881 return cmd; 3882 } 3883 3884 static ipfw_insn * 3885 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) 3886 { 3887 u_char proto = IPPROTO_IP; 3888 3889 if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) 3890 ; /* do not set O_IP4 nor O_IP6 */ 3891 else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) 3892 /* explicit "just IPv4" rule */ 3893 fill_cmd(cmd, O_IP4, 0, 0); 3894 else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { 3895 /* explicit "just IPv6" rule */ 3896 proto = IPPROTO_IPV6; 3897 fill_cmd(cmd, O_IP6, 0, 0); 3898 } else 3899 return add_proto0(cmd, av, protop); 3900 3901 *protop = proto; 3902 return cmd; 3903 } 3904 3905 static ipfw_insn * 3906 add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3907 { 3908 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3909 if (cmd->opcode == O_IP_DST_SET) /* set */ 3910 cmd->opcode = O_IP_SRC_SET; 3911 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3912 cmd->opcode = O_IP_SRC_LOOKUP; 3913 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3914 cmd->opcode = O_IP_SRC_ME; 3915 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3916 cmd->opcode = O_IP_SRC; 3917 else /* addr/mask */ 3918 cmd->opcode = O_IP_SRC_MASK; 3919 return cmd; 3920 } 3921 3922 static ipfw_insn * 3923 add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate) 3924 { 3925 fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 3926 if (cmd->opcode == O_IP_DST_SET) /* set */ 3927 ; 3928 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 3929 ; 3930 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 3931 cmd->opcode = O_IP_DST_ME; 3932 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 3933 cmd->opcode = O_IP_DST; 3934 else /* addr/mask */ 3935 cmd->opcode = O_IP_DST_MASK; 3936 return cmd; 3937 } 3938 3939 static ipfw_insn * 3940 add_srcmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3941 { 3942 3943 if (strncmp(av, "table(", 6) == 0) 3944 fill_table(cmd, av, O_MAC_SRC_LOOKUP, tstate); 3945 else 3946 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3947 return cmd; 3948 } 3949 3950 static ipfw_insn * 3951 add_dstmac(ipfw_insn *cmd, char *av, struct tidx *tstate) 3952 { 3953 3954 if (strncmp(av, "table(", 6) == 0) 3955 fill_table(cmd, av, O_MAC_DST_LOOKUP, tstate); 3956 else 3957 errx(EX_DATAERR, "only mac table lookup is supported %s", av); 3958 return cmd; 3959 } 3960 3961 3962 static struct _s_x f_reserved_keywords[] = { 3963 { "altq", TOK_OR }, 3964 { "//", TOK_OR }, 3965 { "diverted", TOK_OR }, 3966 { "dst-port", TOK_OR }, 3967 { "src-port", TOK_OR }, 3968 { "established", TOK_OR }, 3969 { "keep-state", TOK_OR }, 3970 { "frag", TOK_OR }, 3971 { "icmptypes", TOK_OR }, 3972 { "in", TOK_OR }, 3973 { "out", TOK_OR }, 3974 { "ip6", TOK_OR }, 3975 { "any", TOK_OR }, 3976 { "to", TOK_OR }, 3977 { "via", TOK_OR }, 3978 { "{", TOK_OR }, 3979 { "lookup", TOK_OR }, 3980 { "tagged", TOK_OR }, 3981 { NULL, 0 } /* terminator */ 3982 }; 3983 3984 static ipfw_insn * 3985 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen) 3986 { 3987 3988 if (match_token(f_reserved_keywords, av) != -1) 3989 return (NULL); 3990 3991 if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { 3992 /* XXX todo: check that we have a protocol with ports */ 3993 cmd->opcode = opcode; 3994 return cmd; 3995 } 3996 return NULL; 3997 } 3998 3999 static ipfw_insn * 4000 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 4001 { 4002 struct in6_addr a; 4003 char *host, *ch, buf[INET6_ADDRSTRLEN]; 4004 ipfw_insn *ret = NULL; 4005 size_t len; 4006 4007 /* Copy first address in set if needed */ 4008 if ((ch = strpbrk(av, "/,")) != NULL) { 4009 len = ch - av; 4010 strlcpy(buf, av, sizeof(buf)); 4011 if (len < sizeof(buf)) 4012 buf[len] = '\0'; 4013 host = buf; 4014 } else 4015 host = av; 4016 4017 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 4018 inet_pton(AF_INET6, host, &a) == 1) 4019 ret = add_srcip6(cmd, av, cblen, tstate); 4020 /* XXX: should check for IPv4, not !IPv6 */ 4021 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 4022 inet_pton(AF_INET6, host, &a) != 1)) 4023 ret = add_srcip(cmd, av, cblen, tstate); 4024 if (ret == NULL && strcmp(av, "any") != 0) 4025 ret = cmd; 4026 4027 return ret; 4028 } 4029 4030 static ipfw_insn * 4031 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) 4032 { 4033 struct in6_addr a; 4034 char *host, *ch, buf[INET6_ADDRSTRLEN]; 4035 ipfw_insn *ret = NULL; 4036 size_t len; 4037 4038 /* Copy first address in set if needed */ 4039 if ((ch = strpbrk(av, "/,")) != NULL) { 4040 len = ch - av; 4041 strlcpy(buf, av, sizeof(buf)); 4042 if (len < sizeof(buf)) 4043 buf[len] = '\0'; 4044 host = buf; 4045 } else 4046 host = av; 4047 4048 if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || 4049 inet_pton(AF_INET6, host, &a) == 1) 4050 ret = add_dstip6(cmd, av, cblen, tstate); 4051 /* XXX: should check for IPv4, not !IPv6 */ 4052 if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || 4053 inet_pton(AF_INET6, host, &a) != 1)) 4054 ret = add_dstip(cmd, av, cblen, tstate); 4055 if (ret == NULL && strcmp(av, "any") != 0) 4056 ret = cmd; 4057 4058 return ret; 4059 } 4060 4061 static uint16_t 4062 parse_logdst(char *logdst_iter) 4063 { 4064 char *token; 4065 uint16_t ret; 4066 4067 ret = IPFW_LOG_DEFAULT; 4068 while ((token = strsep(&logdst_iter, ",")) != NULL) { 4069 if (_substrcmp(token, "syslog") == 0) { 4070 ret |= IPFW_LOG_SYSLOG; 4071 continue; 4072 } 4073 if (_substrcmp(token, "ipfw0") == 0) { 4074 /* XXX add multiple ipfw* */ 4075 ret |= IPFW_LOG_IPFW0; 4076 continue; 4077 } 4078 if (_substrcmp(token, "rtsock") == 0) { 4079 ret |= IPFW_LOG_RTSOCK; 4080 continue; 4081 } 4082 errx(EX_DATAERR, 4083 "unsupported logdst token"); 4084 } 4085 return (ret); 4086 } 4087 4088 static inline uint32_t 4089 arg_or_targ_relaxed(const char *arg, const char *action, uint32_t maxarg) 4090 { 4091 uint32_t arg1 = (uint32_t)(-1); 4092 4093 if (arg == NULL) 4094 errx(EX_USAGE, "missing argument for %s", action); 4095 if (isdigit(arg[0])) { 4096 arg1 = strtoul(arg, NULL, 10); 4097 if (arg1 < IPFW_ARG_MIN || arg1 > maxarg) 4098 errx(EX_DATAERR, "illegal argument %s(%u) for %s", 4099 arg, arg1, action); 4100 } else if (_substrcmp(arg, "tablearg") == 0) 4101 arg1 = IP_FW_TARG; 4102 return (arg1); 4103 } 4104 4105 static inline uint32_t 4106 arg_or_targ(const char *arg, const char *action) 4107 { 4108 uint32_t arg1 = arg_or_targ_relaxed(arg, action, IPFW_ARG_MAX); 4109 4110 if (arg1 == (uint32_t)(-1)) 4111 errx(EX_DATAERR, "illegal argument %s(%u) for %s", 4112 arg, arg1, action); 4113 return (arg1); 4114 } 4115 4116 static uint16_t 4117 get_divert_port(const char *arg, const char *action) 4118 { 4119 uint32_t arg1 = arg_or_targ_relaxed(arg, action, IPFW_ARG_MAX); 4120 4121 if (arg1 != (uint32_t)(-1)) 4122 return (arg1); 4123 4124 struct servent *s; 4125 setservent(1); 4126 s = getservbyname(arg, "divert"); 4127 if (s == NULL) 4128 errx(EX_DATAERR, "illegal divert/tee port"); 4129 return (ntohs(s->s_port)); 4130 } 4131 4132 /* 4133 * Parse arguments and assemble the microinstructions which make up a rule. 4134 * Rules are added into the 'rulebuf' and then copied in the correct order 4135 * into the actual rule. 4136 * 4137 * The syntax for a rule starts with the action, followed by 4138 * optional action parameters, and the various match patterns. 4139 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 4140 * (generated if the rule includes a keep-state option), then the 4141 * various match patterns, log/altq actions, and the actual action. 4142 * 4143 */ 4144 static void 4145 compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) 4146 { 4147 /* 4148 * rules are added into the 'rulebuf' and then copied in 4149 * the correct order into the actual rule. 4150 * Some things that need to go out of order (prob, action etc.) 4151 * go into actbuf[]. 4152 */ 4153 static uint32_t actbuf[255], cmdbuf[255]; 4154 int rblen, ablen, cblen; 4155 4156 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 4157 ipfw_insn *first_cmd; /* first match pattern */ 4158 4159 struct ip_fw_rule *rule; 4160 4161 /* 4162 * various flags used to record that we entered some fields. 4163 */ 4164 ipfw_insn *have_state = NULL; /* any state-related option */ 4165 int have_rstate = 0; 4166 ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; 4167 ipfw_insn *have_skipcmd = NULL; 4168 size_t len; 4169 4170 int i; 4171 4172 int open_par = 0; /* open parenthesis ( */ 4173 4174 /* proto is here because it is used to fetch ports */ 4175 u_char proto = IPPROTO_IP; /* default protocol */ 4176 4177 double match_prob = 1; /* match probability, default is always match */ 4178 4179 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 4180 bzero(cmdbuf, sizeof(cmdbuf)); 4181 bzero(rbuf, *rbufsize); 4182 4183 rule = (struct ip_fw_rule *)rbuf; 4184 cmd = (ipfw_insn *)cmdbuf; 4185 action = (ipfw_insn *)actbuf; 4186 4187 rblen = *rbufsize / sizeof(uint32_t); 4188 rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); 4189 ablen = nitems(actbuf); 4190 cblen = nitems(cmdbuf); 4191 cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; 4192 4193 #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } 4194 #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) 4195 4196 av++; 4197 4198 /* [rule N] -- Rule number optional */ 4199 if (av[0] && isdigit(**av)) { 4200 rule->rulenum = atoi(*av); 4201 av++; 4202 } 4203 4204 /* [set N] -- set number (0..RESVD_SET), optional */ 4205 if (av[0] && av[1] && _substrcmp(*av, "set") == 0) { 4206 int set = strtoul(av[1], NULL, 10); 4207 if (set < 0 || set > RESVD_SET) 4208 errx(EX_DATAERR, "illegal set %s", av[1]); 4209 rule->set = set; 4210 tstate->set = set; 4211 av += 2; 4212 } 4213 4214 /* [prob D] -- match probability, optional */ 4215 if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) { 4216 match_prob = strtod(av[1], NULL); 4217 4218 if (match_prob <= 0 || match_prob > 1) 4219 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 4220 av += 2; 4221 } 4222 4223 /* action -- mandatory */ 4224 NEED1("missing action"); 4225 i = match_token(rule_actions, *av); 4226 av++; 4227 action->len = 1; /* default */ 4228 CHECK_ACTLEN; 4229 switch(i) { 4230 case TOK_CHECKSTATE: 4231 have_state = action; 4232 action->opcode = O_CHECK_STATE; 4233 action->len = F_INSN_SIZE(ipfw_insn_kidx); 4234 CHECK_ACTLEN; 4235 if (*av == NULL || 4236 match_token(rule_options, *av) == TOK_COMMENT) { 4237 insntod(have_state, kidx)->kidx = pack_object(tstate, 4238 default_state_name, IPFW_TLV_STATE_NAME); 4239 break; 4240 } 4241 if (*av[0] == ':') { 4242 if (strcmp(*av + 1, "any") == 0) 4243 insntod(have_state, kidx)->kidx = 0; 4244 else if (state_check_name(*av + 1) == 0) 4245 insntod(have_state, kidx)->kidx = pack_object( 4246 tstate, *av + 1, IPFW_TLV_STATE_NAME); 4247 else 4248 errx(EX_DATAERR, "Invalid state name %s", 4249 *av); 4250 av++; 4251 break; 4252 } 4253 errx(EX_DATAERR, "Invalid state name %s", *av); 4254 break; 4255 4256 case TOK_ABORT: 4257 action->opcode = O_REJECT; 4258 action->arg1 = ICMP_REJECT_ABORT; 4259 break; 4260 4261 case TOK_ABORT6: 4262 action->opcode = O_UNREACH6; 4263 action->arg1 = ICMP6_UNREACH_ABORT; 4264 break; 4265 4266 case TOK_ACCEPT: 4267 action->opcode = O_ACCEPT; 4268 break; 4269 4270 case TOK_DENY: 4271 action->opcode = O_DENY; 4272 action->arg1 = 0; 4273 break; 4274 4275 case TOK_REJECT: 4276 action->opcode = O_REJECT; 4277 action->arg1 = ICMP_UNREACH_HOST; 4278 break; 4279 4280 case TOK_RESET: 4281 action->opcode = O_REJECT; 4282 action->arg1 = ICMP_REJECT_RST; 4283 break; 4284 4285 case TOK_RESET6: 4286 action->opcode = O_UNREACH6; 4287 action->arg1 = ICMP6_UNREACH_RST; 4288 break; 4289 4290 case TOK_UNREACH: 4291 action->opcode = O_REJECT; 4292 NEED1("missing reject code"); 4293 action->arg1 = get_reject_code(*av); 4294 av++; 4295 if (action->arg1 == ICMP_UNREACH_NEEDFRAG && isdigit(**av)) { 4296 uint16_t mtu; 4297 4298 mtu = strtoul(*av, NULL, 10); 4299 if (mtu < 68 || mtu >= IP_MAXPACKET) 4300 errx(EX_DATAERR, "illegal argument for %s", 4301 *(av - 1)); 4302 action->len = F_INSN_SIZE(ipfw_insn_u16); 4303 insntod(action, u16)->ports[0] = mtu; 4304 av++; 4305 } 4306 break; 4307 4308 case TOK_UNREACH6: 4309 action->opcode = O_UNREACH6; 4310 NEED1("missing unreach code"); 4311 action->arg1 = get_unreach6_code(*av); 4312 av++; 4313 break; 4314 4315 case TOK_COUNT: 4316 action->opcode = O_COUNT; 4317 break; 4318 4319 case TOK_NAT: 4320 action->opcode = O_NAT; 4321 action->len = F_INSN_SIZE(ipfw_insn_nat); 4322 CHECK_ACTLEN; 4323 if (*av != NULL && _substrcmp(*av, "global") == 0) 4324 action->arg1 = IP_FW_NAT44_GLOBAL; 4325 else 4326 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4327 av++; 4328 break; 4329 case TOK_QUEUE: 4330 action->opcode = O_QUEUE; 4331 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4332 av++; 4333 break; 4334 case TOK_PIPE: 4335 action->opcode = O_PIPE; 4336 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4337 av++; 4338 break; 4339 case TOK_SKIPTO: 4340 action->opcode = O_SKIPTO; 4341 action->len = F_INSN_SIZE(ipfw_insn_u32); 4342 CHECK_ACTLEN; 4343 insntod(action, u32)->d[0] = 4344 arg_or_targ_relaxed(av[0], *(av - 1), IPFW_DEFAULT_RULE); 4345 av++; 4346 break; 4347 case TOK_NETGRAPH: 4348 action->opcode = O_NETGRAPH; 4349 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4350 av++; 4351 break; 4352 case TOK_NGTEE: 4353 action->opcode = O_NGTEE; 4354 action->arg1 = arg_or_targ(av[0], *(av - 1)); 4355 av++; 4356 break; 4357 case TOK_DIVERT: 4358 action->opcode = O_DIVERT; 4359 action->arg1 = get_divert_port(av[0], *(av - 1)); 4360 av++; 4361 break; 4362 case TOK_TEE: 4363 action->opcode = O_TEE; 4364 action->arg1 = get_divert_port(av[0], *(av - 1)); 4365 av++; 4366 break; 4367 case TOK_CALL: 4368 action->opcode = O_CALLRETURN; 4369 action->len = F_INSN_SIZE(ipfw_insn_u32); 4370 CHECK_ACTLEN; 4371 insntod(action, u32)->d[0] = 4372 arg_or_targ_relaxed(av[0], *(av - 1), IPFW_DEFAULT_RULE); 4373 av++; 4374 break; 4375 4376 case TOK_FORWARD: { 4377 /* 4378 * Locate the address-port separator (':' or ','). 4379 * Could be one of the following: 4380 * hostname:port 4381 * IPv4 a.b.c.d,port 4382 * IPv4 a.b.c.d:port 4383 * IPv6 w:x:y::z,port 4384 * IPv6 [w:x:y::z]:port 4385 */ 4386 struct sockaddr_storage result; 4387 struct addrinfo *res; 4388 char *s, *end; 4389 int family; 4390 u_short port_number = 0; 4391 4392 NEED1("missing forward address[:port]"); 4393 4394 if (strncmp(*av, "tablearg", 8) == 0 && 4395 ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':')) 4396 memcpy(++(*av), "0.0.0.0", 7); 4397 4398 /* 4399 * Are we an bracket-enclosed IPv6 address? 4400 */ 4401 if (strchr(*av, '[')) 4402 (*av)++; 4403 4404 /* 4405 * locate the address-port separator (':' or ',') 4406 */ 4407 s = strchr(*av, ','); 4408 if (s == NULL) { 4409 s = strchr(*av, ']'); 4410 /* Prevent erroneous parsing on brackets. */ 4411 if (s != NULL) 4412 *(s++) = '\0'; 4413 else 4414 s = *av; 4415 4416 /* Distinguish between IPv4:port and IPv6 cases. */ 4417 s = strchr(s, ':'); 4418 if (s && strchr(s+1, ':')) 4419 s = NULL; /* no port */ 4420 } 4421 4422 if (s != NULL) { 4423 /* Terminate host portion and set s to start of port. */ 4424 *(s++) = '\0'; 4425 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 4426 if (s == end) 4427 errx(EX_DATAERR, 4428 "illegal forwarding port ``%s''", s); 4429 port_number = (u_short)i; 4430 } 4431 4432 /* 4433 * Resolve the host name or address to a family and a 4434 * network representation of the address. 4435 */ 4436 if (getaddrinfo(*av, NULL, NULL, &res)) 4437 errx(EX_DATAERR, NULL); 4438 /* Just use the first host in the answer. */ 4439 family = res->ai_family; 4440 memcpy(&result, res->ai_addr, res->ai_addrlen); 4441 freeaddrinfo(res); 4442 4443 if (family == PF_INET) { 4444 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 4445 4446 action->opcode = O_FORWARD_IP; 4447 action->len = F_INSN_SIZE(ipfw_insn_sa); 4448 CHECK_ACTLEN; 4449 4450 /* 4451 * In the kernel we assume AF_INET and use only 4452 * sin_port and sin_addr. Remember to set sin_len as 4453 * the routing code seems to use it too. 4454 */ 4455 p->sa.sin_len = sizeof(struct sockaddr_in); 4456 p->sa.sin_family = AF_INET; 4457 p->sa.sin_port = port_number; 4458 p->sa.sin_addr.s_addr = 4459 ((struct sockaddr_in *)&result)->sin_addr.s_addr; 4460 } else if (family == PF_INET6) { 4461 ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; 4462 4463 action->opcode = O_FORWARD_IP6; 4464 action->len = F_INSN_SIZE(ipfw_insn_sa6); 4465 CHECK_ACTLEN; 4466 4467 p->sa.sin6_len = sizeof(struct sockaddr_in6); 4468 p->sa.sin6_family = AF_INET6; 4469 p->sa.sin6_port = port_number; 4470 p->sa.sin6_flowinfo = 0; 4471 p->sa.sin6_scope_id = 4472 ((struct sockaddr_in6 *)&result)->sin6_scope_id; 4473 bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, 4474 &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); 4475 } else { 4476 errx(EX_DATAERR, "Invalid address family in forward action"); 4477 } 4478 av++; 4479 break; 4480 } 4481 case TOK_COMMENT: 4482 /* pretend it is a 'count' rule followed by the comment */ 4483 action->opcode = O_COUNT; 4484 av--; /* go back... */ 4485 break; 4486 4487 case TOK_SETFIB: 4488 { 4489 int numfibs; 4490 size_t intsize = sizeof(int); 4491 4492 action->opcode = O_SETFIB; 4493 NEED1("missing fib number"); 4494 if (_substrcmp(*av, "tablearg") == 0) { 4495 action->arg1 = IP_FW_TARG; 4496 } else { 4497 action->arg1 = strtoul(*av, NULL, 10); 4498 if (sysctlbyname("net.fibs", &numfibs, &intsize, 4499 NULL, 0) == -1) 4500 errx(EX_DATAERR, "fibs not supported.\n"); 4501 if (action->arg1 >= numfibs) /* Temporary */ 4502 errx(EX_DATAERR, "fib too large.\n"); 4503 /* Add high-order bit to fib to make room for tablearg*/ 4504 action->arg1 |= 0x8000; 4505 } 4506 av++; 4507 break; 4508 } 4509 4510 case TOK_SETDSCP: 4511 { 4512 int code; 4513 4514 action->opcode = O_SETDSCP; 4515 NEED1("missing DSCP code"); 4516 if (_substrcmp(*av, "tablearg") == 0) { 4517 action->arg1 = IP_FW_TARG; 4518 } else { 4519 if (isalpha(*av[0])) { 4520 if ((code = match_token(f_ipdscp, *av)) == -1) 4521 errx(EX_DATAERR, "Unknown DSCP code"); 4522 action->arg1 = code; 4523 } else 4524 action->arg1 = strtoul(*av, NULL, 10); 4525 /* 4526 * Add high-order bit to DSCP to make room 4527 * for tablearg 4528 */ 4529 action->arg1 |= 0x8000; 4530 } 4531 av++; 4532 break; 4533 } 4534 4535 case TOK_REASS: 4536 action->opcode = O_REASS; 4537 break; 4538 4539 case TOK_RETURN: 4540 action->opcode = O_CALLRETURN; 4541 action->len = F_INSN_SIZE(ipfw_insn_u32) | F_NOT; 4542 CHECK_ACTLEN; 4543 if (*av != NULL) { 4544 /* 4545 * Return type is optional. 4546 * By default we use RETURN_NEXT_RULENUM. 4547 */ 4548 i = match_token(return_types, *av); 4549 if (i >= 0) { 4550 action->arg1 = i; 4551 av++; 4552 } else 4553 action->arg1 = RETURN_NEXT_RULENUM; 4554 } 4555 break; 4556 4557 case TOK_SETMARK: { 4558 action->opcode = O_SETMARK; 4559 action->len = F_INSN_SIZE(ipfw_insn_u32); 4560 NEED1("missing mark"); 4561 if (strcmp(*av, "tablearg") == 0) { 4562 action->arg1 = IP_FW_TARG; 4563 } else { 4564 insntod(action, u32)->d[0] = strtoul(*av, NULL, 0); 4565 /* This is not a tablearg */ 4566 action->arg1 |= 0x8000; 4567 } 4568 av++; 4569 CHECK_CMDLEN; 4570 break; 4571 } 4572 4573 case TOK_TCPSETMSS: { 4574 u_long mss; 4575 uint32_t idx; 4576 4577 idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION); 4578 if (idx == 0) 4579 errx(EX_DATAERR, "pack_object failed"); 4580 action->opcode = O_EXTERNAL_ACTION; 4581 action->len = F_INSN_SIZE(ipfw_insn_kidx); 4582 CHECK_ACTLEN; 4583 insntod(action, kidx)->kidx = idx; 4584 4585 NEED1("Missing MSS value"); 4586 action = next_cmd(action, &ablen); 4587 action->len = 1; 4588 CHECK_ACTLEN; 4589 mss = strtoul(*av, NULL, 10); 4590 if (mss == 0 || mss > UINT16_MAX) 4591 errx(EX_USAGE, "invalid MSS value %s", *av); 4592 fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss); 4593 av++; 4594 break; 4595 } 4596 4597 default: 4598 av--; 4599 if (match_token(rule_eactions, *av) == -1) 4600 errx(EX_DATAERR, "invalid action %s\n", *av); 4601 /* 4602 * External actions support. 4603 * XXX: we support only syntax with instance name. 4604 * For known external actions (from rule_eactions list) 4605 * we can handle syntax directly. But with `eaction' 4606 * keyword we can use only `eaction <name> <instance>' 4607 * syntax. 4608 */ 4609 case TOK_EACTION: { 4610 uint32_t idx; 4611 4612 NEED1("Missing eaction name"); 4613 if (eaction_check_name(*av) != 0) 4614 errx(EX_DATAERR, "Invalid eaction name %s", *av); 4615 idx = pack_object(tstate, *av, IPFW_TLV_EACTION); 4616 if (idx == 0) 4617 errx(EX_DATAERR, "pack_object failed"); 4618 action->opcode = O_EXTERNAL_ACTION; 4619 action->len = F_INSN_SIZE(ipfw_insn_kidx); 4620 CHECK_ACTLEN; 4621 insntod(action, kidx)->kidx = idx; 4622 4623 av++; 4624 NEED1("Missing eaction instance name"); 4625 if (eaction_check_name(*av) != 0) 4626 errx(EX_DATAERR, "Invalid eaction instance name %s", 4627 *av); 4628 /* 4629 * External action instance object has TLV type depended 4630 * from the external action name object index. Since we 4631 * currently don't know this index, use zero as TLV type. 4632 */ 4633 idx = pack_object(tstate, *av, 0); 4634 if (idx == 0) 4635 errx(EX_DATAERR, "pack_object failed"); 4636 action = next_cmd(action, &ablen); 4637 action->opcode = O_EXTERNAL_INSTANCE; 4638 action->len = F_INSN_SIZE(ipfw_insn_kidx); 4639 CHECK_ACTLEN; 4640 insntod(action, kidx)->kidx = idx; 4641 av++; 4642 } 4643 } 4644 action = next_cmd(action, &ablen); 4645 4646 /* 4647 * [altq queuename] -- altq tag, optional 4648 * [log [logamount N]] -- log, optional 4649 * 4650 * If they exist, it go first in the cmdbuf, but then it is 4651 * skipped in the copy section to the end of the buffer. 4652 */ 4653 while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 4654 av++; 4655 switch (i) { 4656 case TOK_LOG: 4657 { 4658 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 4659 int l; 4660 4661 if (have_log) 4662 errx(EX_DATAERR, 4663 "log cannot be specified more than once"); 4664 have_log = (ipfw_insn *)c; 4665 cmd->len = F_INSN_SIZE(ipfw_insn_log); 4666 CHECK_CMDLEN; 4667 cmd->opcode = O_LOG; 4668 cmd->arg1 = IPFW_LOG_DEFAULT; 4669 /* logdst before logamount */ 4670 if (av[0] && _substrcmp(*av, "logdst") == 0) { 4671 av++; 4672 NEED1("logdst requires argument"); 4673 cmd->arg1 = parse_logdst(*av); 4674 av++; 4675 } 4676 4677 if (av[0] && _substrcmp(*av, "logamount") == 0) { 4678 av++; 4679 NEED1("logamount requires argument"); 4680 l = atoi(*av); 4681 if (l < 0) 4682 errx(EX_DATAERR, 4683 "logamount must be positive"); 4684 c->max_log = l; 4685 av++; 4686 } else { 4687 len = sizeof(c->max_log); 4688 if (sysctlbyname("net.inet.ip.fw.verbose_limit", 4689 &c->max_log, &len, NULL, 0) == -1) { 4690 if (g_co.test_only) { 4691 c->max_log = 0; 4692 break; 4693 } 4694 errx(1, "sysctlbyname(\"%s\")", 4695 "net.inet.ip.fw.verbose_limit"); 4696 } 4697 } 4698 4699 /* logdst after logamount */ 4700 if (av[0] && _substrcmp(*av, "logdst") == 0) { 4701 av++; 4702 NEED1("logdst requires argument"); 4703 cmd->arg1 = parse_logdst(*av); 4704 av++; 4705 } 4706 } 4707 break; 4708 4709 #ifndef NO_ALTQ 4710 case TOK_ALTQ: 4711 { 4712 ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; 4713 4714 NEED1("missing altq queue name"); 4715 if (have_altq) 4716 errx(EX_DATAERR, 4717 "altq cannot be specified more than once"); 4718 have_altq = (ipfw_insn *)a; 4719 cmd->len = F_INSN_SIZE(ipfw_insn_altq); 4720 CHECK_CMDLEN; 4721 cmd->opcode = O_ALTQ; 4722 a->qid = altq_name_to_qid(*av); 4723 av++; 4724 } 4725 break; 4726 #endif 4727 4728 case TOK_TAG: 4729 case TOK_UNTAG: { 4730 uint16_t tag; 4731 4732 if (have_tag) 4733 errx(EX_USAGE, "tag and untag cannot be " 4734 "specified more than once"); 4735 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i, 4736 rule_action_params); 4737 have_tag = cmd; 4738 fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); 4739 av++; 4740 break; 4741 } 4742 4743 default: 4744 abort(); 4745 } 4746 cmd = next_cmd(cmd, &cblen); 4747 } 4748 4749 if (have_state) { /* must be a check-state, we are done */ 4750 if (*av != NULL && 4751 match_token(rule_options, *av) == TOK_COMMENT) { 4752 /* check-state has a comment */ 4753 av++; 4754 fill_comment(cmd, av, cblen); 4755 cmd = next_cmd(cmd, &cblen); 4756 av[0] = NULL; 4757 } 4758 goto done; 4759 } 4760 4761 #define OR_START(target) \ 4762 if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ 4763 if (open_par) \ 4764 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 4765 prev = NULL; \ 4766 open_par = 1; \ 4767 if ( (av[0])[1] == '\0') { \ 4768 av++; \ 4769 } else \ 4770 (*av)++; \ 4771 } \ 4772 target: \ 4773 4774 4775 #define CLOSE_PAR \ 4776 if (open_par) { \ 4777 if (av[0] && ( \ 4778 strcmp(*av, ")") == 0 || \ 4779 strcmp(*av, "}") == 0)) { \ 4780 prev = NULL; \ 4781 open_par = 0; \ 4782 av++; \ 4783 } else \ 4784 errx(EX_USAGE, "missing \")\"\n"); \ 4785 } 4786 4787 #define NOT_BLOCK \ 4788 if (av[0] && _substrcmp(*av, "not") == 0) { \ 4789 if (cmd->len & F_NOT) \ 4790 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 4791 cmd->len |= F_NOT; \ 4792 av++; \ 4793 } 4794 4795 #define OR_BLOCK(target) \ 4796 if (av[0] && _substrcmp(*av, "or") == 0) { \ 4797 if (prev == NULL || open_par == 0) \ 4798 errx(EX_DATAERR, "invalid OR block"); \ 4799 prev->len |= F_OR; \ 4800 av++; \ 4801 goto target; \ 4802 } \ 4803 CLOSE_PAR; 4804 4805 first_cmd = cmd; 4806 4807 #if 0 4808 /* 4809 * MAC addresses, optional. 4810 * If we have this, we skip the part "proto from src to dst" 4811 * and jump straight to the option parsing. 4812 */ 4813 NOT_BLOCK; 4814 NEED1("missing protocol"); 4815 if (_substrcmp(*av, "MAC") == 0 || 4816 _substrcmp(*av, "mac") == 0) { 4817 av++; /* the "MAC" keyword */ 4818 add_mac(cmd, av); /* exits in case of errors */ 4819 cmd = next_cmd(cmd); 4820 av += 2; /* dst-mac and src-mac */ 4821 NOT_BLOCK; 4822 NEED1("missing mac type"); 4823 if (add_mactype(cmd, av[0])) 4824 cmd = next_cmd(cmd); 4825 av++; /* any or mac-type */ 4826 goto read_options; 4827 } 4828 #endif 4829 4830 /* 4831 * protocol, mandatory 4832 */ 4833 OR_START(get_proto); 4834 NOT_BLOCK; 4835 NEED1("missing protocol"); 4836 if (add_proto_compat(cmd, *av, &proto)) { 4837 av++; 4838 if (F_LEN(cmd) != 0) { 4839 prev = cmd; 4840 cmd = next_cmd(cmd, &cblen); 4841 } 4842 } else if (first_cmd != cmd) { 4843 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 4844 } else { 4845 rule->flags |= IPFW_RULE_JUSTOPTS; 4846 goto read_options; 4847 } 4848 OR_BLOCK(get_proto); 4849 4850 first_cmd = cmd; /* update pointer to use in compact form */ 4851 4852 /* 4853 * "from", mandatory 4854 */ 4855 if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) 4856 errx(EX_USAGE, "missing ``from''"); 4857 av++; 4858 4859 /* 4860 * source IP, mandatory 4861 */ 4862 OR_START(source_ip); 4863 NOT_BLOCK; /* optional "not" */ 4864 NEED1("missing source address"); 4865 if (add_src(cmd, *av, proto, cblen, tstate)) { 4866 av++; 4867 if (F_LEN(cmd) != 0) { /* ! any */ 4868 prev = cmd; 4869 cmd = next_cmd(cmd, &cblen); 4870 } 4871 } else 4872 errx(EX_USAGE, "bad source address %s", *av); 4873 OR_BLOCK(source_ip); 4874 4875 /* 4876 * source ports, optional 4877 */ 4878 NOT_BLOCK; /* optional "not" */ 4879 if ( av[0] != NULL ) { 4880 if (_substrcmp(*av, "any") == 0 || 4881 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 4882 av++; 4883 if (F_LEN(cmd) != 0) 4884 cmd = next_cmd(cmd, &cblen); 4885 } 4886 } 4887 4888 /* 4889 * "to", mandatory 4890 */ 4891 if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) 4892 errx(EX_USAGE, "missing ``to''"); 4893 av++; 4894 4895 /* 4896 * destination, mandatory 4897 */ 4898 OR_START(dest_ip); 4899 NOT_BLOCK; /* optional "not" */ 4900 NEED1("missing dst address"); 4901 if (add_dst(cmd, *av, proto, cblen, tstate)) { 4902 av++; 4903 if (F_LEN(cmd) != 0) { /* ! any */ 4904 prev = cmd; 4905 cmd = next_cmd(cmd, &cblen); 4906 } 4907 } else 4908 errx( EX_USAGE, "bad destination address %s", *av); 4909 OR_BLOCK(dest_ip); 4910 4911 /* 4912 * dest. ports, optional 4913 */ 4914 NOT_BLOCK; /* optional "not" */ 4915 if (av[0]) { 4916 if (_substrcmp(*av, "any") == 0 || 4917 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 4918 av++; 4919 if (F_LEN(cmd) != 0) 4920 cmd = next_cmd(cmd, &cblen); 4921 } 4922 } 4923 if (first_cmd == cmd) 4924 rule->flags |= IPFW_RULE_NOOPT; 4925 4926 read_options: 4927 prev = NULL; 4928 while ( av[0] != NULL ) { 4929 char *s; 4930 ipfw_insn_u32 *cmd32; /* alias for cmd */ 4931 4932 s = *av; 4933 cmd32 = (ipfw_insn_u32 *)cmd; 4934 4935 if (*s == '!') { /* alternate syntax for NOT */ 4936 if (cmd->len & F_NOT) 4937 errx(EX_USAGE, "double \"not\" not allowed\n"); 4938 cmd->len = F_NOT; 4939 s++; 4940 } 4941 i = match_token(rule_options, s); 4942 av++; 4943 switch(i) { 4944 case TOK_NOT: 4945 if (cmd->len & F_NOT) 4946 errx(EX_USAGE, "double \"not\" not allowed\n"); 4947 cmd->len = F_NOT; 4948 break; 4949 4950 case TOK_OR: 4951 if (open_par == 0 || prev == NULL) 4952 errx(EX_USAGE, "invalid \"or\" block\n"); 4953 prev->len |= F_OR; 4954 break; 4955 4956 case TOK_STARTBRACE: 4957 if (open_par) 4958 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 4959 open_par = 1; 4960 break; 4961 4962 case TOK_ENDBRACE: 4963 if (!open_par) 4964 errx(EX_USAGE, "+missing \")\"\n"); 4965 open_par = 0; 4966 prev = NULL; 4967 break; 4968 4969 case TOK_IN: 4970 fill_cmd(cmd, O_IN, 0, 0); 4971 break; 4972 4973 case TOK_OUT: 4974 cmd->len ^= F_NOT; /* toggle F_NOT */ 4975 fill_cmd(cmd, O_IN, 0, 0); 4976 break; 4977 4978 case TOK_DIVERTED: 4979 fill_cmd(cmd, O_DIVERTED, 0, 3); 4980 break; 4981 4982 case TOK_DIVERTEDLOOPBACK: 4983 fill_cmd(cmd, O_DIVERTED, 0, 1); 4984 break; 4985 4986 case TOK_DIVERTEDOUTPUT: 4987 fill_cmd(cmd, O_DIVERTED, 0, 2); 4988 break; 4989 4990 case TOK_FRAG: { 4991 uint32_t set = 0, clear = 0; 4992 4993 if (*av != NULL && fill_flags(f_ipoff, *av, NULL, 4994 &set, &clear) == 0) 4995 av++; 4996 else { 4997 /* 4998 * Compatibility: no argument after "frag" 4999 * keyword equals to "frag offset". 5000 */ 5001 set = 0x01; 5002 clear = 0; 5003 } 5004 fill_cmd(cmd, O_FRAG, 0, 5005 (set & 0xff) | ( (clear & 0xff) << 8)); 5006 break; 5007 } 5008 5009 case TOK_LAYER2: 5010 fill_cmd(cmd, O_LAYER2, 0, 0); 5011 break; 5012 5013 case TOK_XMIT: 5014 case TOK_RECV: 5015 case TOK_VIA: 5016 NEED1("recv, xmit, via require interface name" 5017 " or address"); 5018 fill_iface(insntod(cmd, if), av[0], cblen, tstate); 5019 av++; 5020 if (F_LEN(cmd) == 0) /* not a valid address */ 5021 break; 5022 if (i == TOK_XMIT) 5023 cmd->opcode = O_XMIT; 5024 else if (i == TOK_RECV) 5025 cmd->opcode = O_RECV; 5026 else if (i == TOK_VIA) 5027 cmd->opcode = O_VIA; 5028 break; 5029 5030 case TOK_ICMPTYPES: 5031 NEED1("icmptypes requires list of types"); 5032 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 5033 av++; 5034 break; 5035 5036 case TOK_ICMP6TYPES: 5037 NEED1("icmptypes requires list of types"); 5038 fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); 5039 av++; 5040 break; 5041 5042 case TOK_IPTTL: 5043 NEED1("ipttl requires TTL"); 5044 if (strpbrk(*av, "-,")) { 5045 if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) 5046 errx(EX_DATAERR, "invalid ipttl %s", *av); 5047 } else 5048 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 5049 av++; 5050 break; 5051 5052 case TOK_IPID: 5053 NEED1("ipid requires id"); 5054 if (strpbrk(*av, "-,")) { 5055 if (!add_ports(cmd, *av, 0, O_IPID, cblen)) 5056 errx(EX_DATAERR, "invalid ipid %s", *av); 5057 } else 5058 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 5059 av++; 5060 break; 5061 5062 case TOK_IPLEN: 5063 NEED1("iplen requires length"); 5064 if (strpbrk(*av, "-,")) { 5065 if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) 5066 errx(EX_DATAERR, "invalid ip len %s", *av); 5067 } else 5068 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 5069 av++; 5070 break; 5071 5072 case TOK_IPVER: 5073 NEED1("ipver requires version"); 5074 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 5075 av++; 5076 break; 5077 5078 case TOK_IPPRECEDENCE: 5079 NEED1("ipprecedence requires value"); 5080 fill_cmd(cmd, O_IPPRECEDENCE, 0, 5081 (strtoul(*av, NULL, 0) & 7) << 5); 5082 av++; 5083 break; 5084 5085 case TOK_DSCP: 5086 NEED1("missing DSCP code"); 5087 fill_dscp(cmd, *av, cblen); 5088 av++; 5089 break; 5090 5091 case TOK_IPOPTS: 5092 NEED1("missing argument for ipoptions"); 5093 fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); 5094 av++; 5095 break; 5096 5097 case TOK_IPTOS: 5098 NEED1("missing argument for iptos"); 5099 fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 5100 av++; 5101 break; 5102 5103 case TOK_UID: 5104 NEED1("uid requires argument"); 5105 { 5106 char *end; 5107 uid_t uid; 5108 struct passwd *pwd; 5109 5110 cmd->opcode = O_UID; 5111 uid = strtoul(*av, &end, 0); 5112 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 5113 if (pwd == NULL) 5114 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 5115 cmd32->d[0] = pwd->pw_uid; 5116 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 5117 av++; 5118 } 5119 break; 5120 5121 case TOK_GID: 5122 NEED1("gid requires argument"); 5123 { 5124 char *end; 5125 gid_t gid; 5126 struct group *grp; 5127 5128 cmd->opcode = O_GID; 5129 gid = strtoul(*av, &end, 0); 5130 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 5131 if (grp == NULL) 5132 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 5133 cmd32->d[0] = grp->gr_gid; 5134 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 5135 av++; 5136 } 5137 break; 5138 5139 case TOK_JAIL: 5140 NEED1("jail requires argument"); 5141 { 5142 char *end; 5143 int jid; 5144 5145 cmd->opcode = O_JAIL; 5146 /* 5147 * If av is a number, then we'll just pass it as-is. If 5148 * it's a name, try to resolve that to a jid. 5149 * 5150 * We save the jail_getid(3) call for a fallback because 5151 * it entails an unconditional trip to the kernel to 5152 * either validate a jid or resolve a name to a jid. 5153 * This specific token doesn't currently require a 5154 * jid to be an active jail, so we save a transition 5155 * by simply using a number that we're given. 5156 */ 5157 jid = strtoul(*av, &end, 10); 5158 if (*end != '\0') { 5159 jid = jail_getid(*av); 5160 if (jid < 0) 5161 errx(EX_DATAERR, "%s", jail_errmsg); 5162 } 5163 cmd32->d[0] = (uint32_t)jid; 5164 cmd->len |= F_INSN_SIZE(ipfw_insn_u32); 5165 av++; 5166 } 5167 break; 5168 5169 case TOK_ESTAB: 5170 fill_cmd(cmd, O_ESTAB, 0, 0); 5171 break; 5172 5173 case TOK_SETUP: 5174 fill_cmd(cmd, O_TCPFLAGS, 0, 5175 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 5176 break; 5177 5178 case TOK_TCPDATALEN: 5179 NEED1("tcpdatalen requires length"); 5180 if (strpbrk(*av, "-,")) { 5181 if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen)) 5182 errx(EX_DATAERR, "invalid tcpdata len %s", *av); 5183 } else 5184 fill_cmd(cmd, O_TCPDATALEN, 0, 5185 strtoul(*av, NULL, 0)); 5186 av++; 5187 break; 5188 5189 case TOK_TCPOPTS: 5190 NEED1("missing argument for tcpoptions"); 5191 fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 5192 av++; 5193 break; 5194 5195 case TOK_TCPSEQ: 5196 case TOK_TCPACK: 5197 NEED1("tcpseq/tcpack requires argument"); 5198 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 5199 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 5200 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 5201 av++; 5202 break; 5203 5204 case TOK_TCPMSS: 5205 case TOK_TCPWIN: 5206 NEED1("tcpmss/tcpwin requires size"); 5207 if (strpbrk(*av, "-,")) { 5208 if (add_ports(cmd, *av, 0, 5209 i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS, 5210 cblen) == NULL) 5211 errx(EX_DATAERR, "invalid %s size %s", 5212 s, *av); 5213 } else 5214 fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN : 5215 O_TCPMSS, 0, strtoul(*av, NULL, 0)); 5216 av++; 5217 break; 5218 5219 case TOK_TCPFLAGS: 5220 NEED1("missing argument for tcpflags"); 5221 cmd->opcode = O_TCPFLAGS; 5222 fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 5223 av++; 5224 break; 5225 5226 case TOK_KEEPSTATE: 5227 case TOK_RECORDSTATE: { 5228 uint32_t uidx; 5229 5230 if (open_par) 5231 errx(EX_USAGE, "keep-state or record-state cannot be part " 5232 "of an or block"); 5233 if (have_state) 5234 errx(EX_USAGE, "only one of keep-state, record-state, " 5235 " limit and set-limit is allowed"); 5236 if (*av != NULL && *av[0] == ':') { 5237 if (state_check_name(*av + 1) != 0) 5238 errx(EX_DATAERR, 5239 "Invalid state name %s", *av); 5240 uidx = pack_object(tstate, *av + 1, 5241 IPFW_TLV_STATE_NAME); 5242 av++; 5243 } else 5244 uidx = pack_object(tstate, default_state_name, 5245 IPFW_TLV_STATE_NAME); 5246 have_state = cmd; 5247 have_rstate = i == TOK_RECORDSTATE; 5248 cmd->opcode = O_KEEP_STATE; 5249 cmd->len = F_INSN_SIZE(ipfw_insn_kidx); 5250 CHECK_CMDLEN; 5251 insntod(have_state, kidx)->kidx = uidx; 5252 break; 5253 } 5254 5255 case TOK_LIMIT: 5256 case TOK_SETLIMIT: { 5257 ipfw_insn_limit *c = insntod(cmd, limit); 5258 int val; 5259 5260 if (open_par) 5261 errx(EX_USAGE, 5262 "limit or set-limit cannot be part of an or block"); 5263 if (have_state) 5264 errx(EX_USAGE, "only one of keep-state, record-state, " 5265 " limit and set-limit is allowed"); 5266 have_state = cmd; 5267 have_rstate = i == TOK_SETLIMIT; 5268 5269 cmd->opcode = O_LIMIT; 5270 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 5271 CHECK_CMDLEN; 5272 c->limit_mask = c->conn_limit = c->kidx = 0; 5273 5274 while ( av[0] != NULL ) { 5275 if ((val = match_token(limit_masks, *av)) <= 0) 5276 break; 5277 c->limit_mask |= val; 5278 av++; 5279 } 5280 5281 if (c->limit_mask == 0) 5282 errx(EX_USAGE, "limit: missing limit mask"); 5283 5284 GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, 5285 TOK_LIMIT, rule_options); 5286 av++; 5287 5288 if (*av != NULL && *av[0] == ':') { 5289 if (state_check_name(*av + 1) != 0) 5290 errx(EX_DATAERR, 5291 "Invalid state name %s", *av); 5292 c->kidx = pack_object(tstate, *av + 1, 5293 IPFW_TLV_STATE_NAME); 5294 av++; 5295 } else 5296 c->kidx = pack_object(tstate, 5297 default_state_name, IPFW_TLV_STATE_NAME); 5298 break; 5299 } 5300 5301 case TOK_PROTO: 5302 NEED1("missing protocol"); 5303 if (add_proto(cmd, *av, &proto)) { 5304 av++; 5305 } else 5306 errx(EX_DATAERR, "invalid protocol ``%s''", 5307 *av); 5308 break; 5309 5310 case TOK_SRCIP: 5311 NEED1("missing source IP"); 5312 if (add_srcip(cmd, *av, cblen, tstate)) { 5313 av++; 5314 } 5315 break; 5316 5317 case TOK_DSTIP: 5318 NEED1("missing destination IP"); 5319 if (add_dstip(cmd, *av, cblen, tstate)) { 5320 av++; 5321 } 5322 break; 5323 5324 case TOK_SRCIP6: 5325 NEED1("missing source IP6"); 5326 if (add_srcip6(cmd, *av, cblen, tstate)) { 5327 av++; 5328 } 5329 break; 5330 5331 case TOK_DSTIP6: 5332 NEED1("missing destination IP6"); 5333 if (add_dstip6(cmd, *av, cblen, tstate)) { 5334 av++; 5335 } 5336 break; 5337 5338 5339 case TOK_SRCMAC: 5340 NEED1("missing source MAC"); 5341 if (add_srcmac(cmd, *av, tstate)) { 5342 av++; 5343 } 5344 break; 5345 5346 case TOK_DSTMAC: 5347 NEED1("missing destination MAC"); 5348 if (add_dstmac(cmd, *av, tstate)) { 5349 av++; 5350 } 5351 break; 5352 5353 case TOK_SRCPORT: 5354 NEED1("missing source port"); 5355 if (_substrcmp(*av, "any") == 0 || 5356 add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 5357 av++; 5358 } else 5359 errx(EX_DATAERR, "invalid source port %s", *av); 5360 break; 5361 5362 case TOK_DSTPORT: 5363 NEED1("missing destination port"); 5364 if (_substrcmp(*av, "any") == 0 || 5365 add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { 5366 av++; 5367 } else 5368 errx(EX_DATAERR, "invalid destination port %s", 5369 *av); 5370 break; 5371 5372 case TOK_MAC: 5373 if (add_mac(cmd, av, cblen)) 5374 av += 2; 5375 break; 5376 5377 case TOK_MACTYPE: 5378 NEED1("missing mac type"); 5379 if (!add_mactype(cmd, *av, cblen)) 5380 errx(EX_DATAERR, "invalid mac type %s", *av); 5381 av++; 5382 break; 5383 5384 case TOK_VERREVPATH: 5385 fill_cmd(cmd, O_VERREVPATH, 0, 0); 5386 break; 5387 5388 case TOK_VERSRCREACH: 5389 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 5390 break; 5391 5392 case TOK_ANTISPOOF: 5393 fill_cmd(cmd, O_ANTISPOOF, 0, 0); 5394 break; 5395 5396 case TOK_IPSEC: 5397 fill_cmd(cmd, O_IPSEC, 0, 0); 5398 break; 5399 5400 case TOK_IPV6: 5401 fill_cmd(cmd, O_IP6, 0, 0); 5402 break; 5403 5404 case TOK_IPV4: 5405 fill_cmd(cmd, O_IP4, 0, 0); 5406 break; 5407 5408 case TOK_EXT6HDR: 5409 NEED1("missing extension header"); 5410 fill_ext6hdr( cmd, *av ); 5411 av++; 5412 break; 5413 5414 case TOK_FLOWID: 5415 if (proto != IPPROTO_IPV6 ) 5416 errx( EX_USAGE, "flow-id filter is active " 5417 "only for ipv6 protocol\n"); 5418 fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen); 5419 av++; 5420 break; 5421 5422 case TOK_COMMENT: 5423 fill_comment(cmd, av, cblen); 5424 av[0]=NULL; 5425 break; 5426 5427 case TOK_TAGGED: 5428 if (av[0] && strpbrk(*av, "-,")) { 5429 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) 5430 errx(EX_DATAERR, "tagged: invalid tag" 5431 " list: %s", *av); 5432 } 5433 else { 5434 uint16_t tag; 5435 5436 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, 5437 TOK_TAGGED, rule_options); 5438 fill_cmd(cmd, O_TAGGED, 0, tag); 5439 } 5440 av++; 5441 break; 5442 5443 case TOK_FIB: 5444 NEED1("fib requires fib number"); 5445 fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); 5446 av++; 5447 break; 5448 case TOK_SOCKARG: 5449 fill_cmd(cmd, O_SOCKARG, 0, 0); 5450 break; 5451 5452 case TOK_LOOKUP: { 5453 /* optional mask for some LOOKUP types */ 5454 ipfw_insn_table *c = insntod(cmd, table); 5455 char *lkey; 5456 5457 if (!av[0] || !av[1]) 5458 errx(EX_USAGE, 5459 "format: lookup argument tablenum"); 5460 cmd->opcode = O_IP_DST_LOOKUP; 5461 5462 lkey = strsep(av, ":"); 5463 i = match_token(lookup_keys, lkey); 5464 if (i == -1) 5465 errx(EX_USAGE, 5466 "format: cannot lookup on %s", lkey); 5467 /* masked lookup key */ 5468 if (*av != NULL) { 5469 switch (i) { 5470 case LOOKUP_DST_PORT: 5471 case LOOKUP_SRC_PORT: 5472 case LOOKUP_UID: 5473 case LOOKUP_JAIL: 5474 case LOOKUP_DSCP: 5475 case LOOKUP_MARK: 5476 case LOOKUP_RULENUM: 5477 break; 5478 default: 5479 errx(EX_USAGE, 5480 "masked lookup is not supported " 5481 "for %s", lkey); 5482 } 5483 cmd->len |= F_INSN_SIZE(ipfw_insn_table); 5484 c->value = strtoul(*av, NULL, 0); 5485 if (c->value == 0) 5486 errx(EX_USAGE, 5487 "all-zeroes bitmask for lookup " 5488 "is meaningless"); 5489 } else { 5490 cmd->len |= F_INSN_SIZE(ipfw_insn_kidx); 5491 } 5492 CHECK_CMDLEN; 5493 5494 IPFW_SET_LOOKUP_TYPE(cmd, i); 5495 av++; 5496 c->kidx = pack_table(tstate, *av); 5497 if (c->kidx == 0) 5498 errx(EX_DATAERR, 5499 "Invalid table name: %s", *av); 5500 av++; 5501 } 5502 break; 5503 case TOK_FLOW: 5504 NEED1("missing table name"); 5505 if (strncmp(*av, "table(", 6) != 0) 5506 errx(EX_DATAERR, 5507 "enclose table name into \"table()\""); 5508 fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 5509 av++; 5510 break; 5511 5512 case TOK_SKIPACTION: 5513 if (have_skipcmd) 5514 errx(EX_USAGE, "only one defer-action " 5515 "is allowed"); 5516 have_skipcmd = cmd; 5517 fill_cmd(cmd, O_SKIP_ACTION, 0, 0); 5518 break; 5519 5520 case TOK_MARK: 5521 NEED1("missing mark value:mask"); 5522 fill_mark(cmd, *av, cblen); 5523 av++; 5524 break; 5525 5526 default: 5527 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 5528 } 5529 if (F_LEN(cmd) > 0) { /* prepare to advance */ 5530 prev = cmd; 5531 cmd = next_cmd(cmd, &cblen); 5532 } 5533 } 5534 5535 done: 5536 5537 if (!have_state && have_skipcmd) 5538 warnx("Rule contains \"defer-immediate-action\" " 5539 "and doesn't contain any state-related options."); 5540 5541 /* 5542 * Now copy stuff into the rule. 5543 * If we have a keep-state option, the first instruction 5544 * must be a PROBE_STATE (which is generated here). 5545 * If we have a LOG option, it was stored as the first command, 5546 * and now must be moved to the top of the action part. 5547 */ 5548 dst = (ipfw_insn *)rule->cmd; 5549 5550 /* 5551 * First thing to write into the command stream is the match probability. 5552 */ 5553 if (match_prob != 1) { /* 1 means always match */ 5554 dst->opcode = O_PROB; 5555 dst->len = 2; 5556 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 5557 dst += dst->len; 5558 } 5559 5560 /* 5561 * generate O_PROBE_STATE if necessary 5562 */ 5563 if (have_state && have_state->opcode != O_CHECK_STATE && !have_rstate) { 5564 dst->opcode = O_PROBE_STATE; 5565 dst->len = F_INSN_SIZE(ipfw_insn_kidx); 5566 insntod(dst, kidx)->kidx = insntod(have_state, kidx)->kidx; 5567 dst = next_cmd(dst, &rblen); 5568 } 5569 5570 /* 5571 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG, 5572 * O_SKIP_ACTION 5573 */ 5574 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 5575 i = F_LEN(src); 5576 CHECK_RBUFLEN(i); 5577 5578 switch (src->opcode) { 5579 case O_LOG: 5580 case O_KEEP_STATE: 5581 case O_LIMIT: 5582 case O_ALTQ: 5583 case O_TAG: 5584 case O_SKIP_ACTION: 5585 break; 5586 default: 5587 bcopy(src, dst, i * sizeof(uint32_t)); 5588 dst += i; 5589 } 5590 } 5591 5592 /* 5593 * put back the have_state command as last opcode 5594 */ 5595 if (have_state && have_state->opcode != O_CHECK_STATE) { 5596 i = F_LEN(have_state); 5597 CHECK_RBUFLEN(i); 5598 bcopy(have_state, dst, i * sizeof(uint32_t)); 5599 dst += i; 5600 } 5601 5602 /* 5603 * put back the have_skipcmd command as very last opcode 5604 */ 5605 if (have_skipcmd) { 5606 i = F_LEN(have_skipcmd); 5607 CHECK_RBUFLEN(i); 5608 bcopy(have_skipcmd, dst, i * sizeof(uint32_t)); 5609 dst += i; 5610 } 5611 5612 /* 5613 * start action section 5614 */ 5615 rule->act_ofs = dst - rule->cmd; 5616 5617 /* put back O_LOG, O_ALTQ, O_TAG if necessary */ 5618 if (have_log) { 5619 i = F_LEN(have_log); 5620 CHECK_RBUFLEN(i); 5621 bcopy(have_log, dst, i * sizeof(uint32_t)); 5622 dst += i; 5623 } 5624 if (have_altq) { 5625 i = F_LEN(have_altq); 5626 CHECK_RBUFLEN(i); 5627 bcopy(have_altq, dst, i * sizeof(uint32_t)); 5628 dst += i; 5629 } 5630 if (have_tag) { 5631 i = F_LEN(have_tag); 5632 CHECK_RBUFLEN(i); 5633 bcopy(have_tag, dst, i * sizeof(uint32_t)); 5634 dst += i; 5635 } 5636 5637 /* 5638 * copy all other actions 5639 */ 5640 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 5641 i = F_LEN(src); 5642 CHECK_RBUFLEN(i); 5643 bcopy(src, dst, i * sizeof(uint32_t)); 5644 dst += i; 5645 } 5646 5647 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 5648 *rbufsize = (char *)dst - (char *)rule; 5649 } 5650 5651 static int 5652 compare_ntlv(const void *_a, const void *_b) 5653 { 5654 const ipfw_obj_ntlv *a, *b; 5655 5656 a = (const ipfw_obj_ntlv *)_a; 5657 b = (const ipfw_obj_ntlv *)_b; 5658 5659 if (a->set < b->set) 5660 return (-1); 5661 else if (a->set > b->set) 5662 return (1); 5663 5664 if (a->idx < b->idx) 5665 return (-1); 5666 else if (a->idx > b->idx) 5667 return (1); 5668 5669 if (a->head.type < b->head.type) 5670 return (-1); 5671 else if (a->head.type > b->head.type) 5672 return (1); 5673 5674 return (0); 5675 } 5676 5677 /* 5678 * Provide kernel with sorted list of referenced objects 5679 */ 5680 static void 5681 object_sort_ctlv(ipfw_obj_ctlv *ctlv) 5682 { 5683 5684 qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv); 5685 } 5686 5687 struct object_kt { 5688 uint32_t uidx; 5689 uint16_t type; 5690 }; 5691 static int 5692 compare_object_kntlv(const void *k, const void *v) 5693 { 5694 const ipfw_obj_ntlv *ntlv; 5695 struct object_kt key; 5696 5697 key = *((const struct object_kt *)k); 5698 ntlv = (const ipfw_obj_ntlv *)v; 5699 5700 if (key.uidx < ntlv->idx) 5701 return (-1); 5702 else if (key.uidx > ntlv->idx) 5703 return (1); 5704 5705 if (key.type < ntlv->head.type) 5706 return (-1); 5707 else if (key.type > ntlv->head.type) 5708 return (1); 5709 5710 return (0); 5711 } 5712 5713 /* 5714 * Finds object name in @ctlv by @idx and @type. 5715 * Uses the following facts: 5716 * 1) All TLVs are the same size 5717 * 2) Kernel implementation provides already sorted list. 5718 * 5719 * Returns table name or NULL. 5720 */ 5721 static char * 5722 object_search_ctlv(ipfw_obj_ctlv *ctlv, uint32_t idx, uint16_t type) 5723 { 5724 ipfw_obj_ntlv *ntlv; 5725 struct object_kt key; 5726 5727 key.uidx = idx; 5728 key.type = type; 5729 5730 ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize, 5731 compare_object_kntlv); 5732 5733 if (ntlv != NULL) 5734 return (ntlv->name); 5735 5736 return (NULL); 5737 } 5738 5739 static char * 5740 table_search_ctlv(ipfw_obj_ctlv *ctlv, uint32_t idx) 5741 { 5742 5743 return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME)); 5744 } 5745 5746 /* 5747 * Adds one or more rules to ipfw chain. 5748 * Data layout: 5749 * Request: 5750 * [ 5751 * ip_fw3_opheader 5752 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) 5753 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) 5754 * ] 5755 * Reply: 5756 * [ 5757 * ip_fw3_opheader 5758 * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) 5759 * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] 5760 * ] 5761 * 5762 * Rules in reply are modified to store their actual ruleset number. 5763 * 5764 * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending 5765 * according to their idx field and there has to be no duplicates. 5766 * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. 5767 * (*3) Each ip_fw structure needs to be aligned to u64 boundary. 5768 */ 5769 void 5770 ipfw_add(char *av[]) 5771 { 5772 uint32_t rulebuf[1024]; 5773 int rbufsize, default_off, tlen, rlen; 5774 size_t sz; 5775 struct tidx ts; 5776 struct ip_fw_rule *rule; 5777 caddr_t tbuf; 5778 ip_fw3_opheader *op3; 5779 ipfw_obj_ctlv *ctlv, *tstate; 5780 5781 rbufsize = sizeof(rulebuf); 5782 memset(rulebuf, 0, rbufsize); 5783 memset(&ts, 0, sizeof(ts)); 5784 5785 /* Optimize case with no tables */ 5786 default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); 5787 op3 = (ip_fw3_opheader *)rulebuf; 5788 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5789 rule = (struct ip_fw_rule *)(ctlv + 1); 5790 rbufsize -= default_off; 5791 5792 compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); 5793 /* Align rule size to u64 boundary */ 5794 rlen = roundup2(rbufsize, sizeof(uint64_t)); 5795 5796 tbuf = NULL; 5797 sz = 0; 5798 tstate = NULL; 5799 if (ts.count != 0) { 5800 /* Some tables. We have to alloc more data */ 5801 tlen = ts.count * sizeof(ipfw_obj_ntlv); 5802 sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; 5803 5804 if ((tbuf = calloc(1, sz)) == NULL) 5805 err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); 5806 op3 = (ip_fw3_opheader *)tbuf; 5807 /* Tables first */ 5808 ctlv = (ipfw_obj_ctlv *)(op3 + 1); 5809 ctlv->head.type = IPFW_TLV_TBLNAME_LIST; 5810 ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; 5811 ctlv->count = ts.count; 5812 ctlv->objsize = sizeof(ipfw_obj_ntlv); 5813 memcpy(ctlv + 1, ts.idx, tlen); 5814 object_sort_ctlv(ctlv); 5815 tstate = ctlv; 5816 /* Rule next */ 5817 ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); 5818 ctlv->head.type = IPFW_TLV_RULE_LIST; 5819 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5820 ctlv->count = 1; 5821 memcpy(ctlv + 1, rule, rbufsize); 5822 } else { 5823 /* Simply add header */ 5824 sz = rlen + default_off; 5825 memset(ctlv, 0, sizeof(*ctlv)); 5826 ctlv->head.type = IPFW_TLV_RULE_LIST; 5827 ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; 5828 ctlv->count = 1; 5829 } 5830 5831 if (do_get3(IP_FW_XADD, op3, &sz) != 0) 5832 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); 5833 5834 if (!g_co.do_quiet) { 5835 struct format_opts sfo; 5836 struct buf_pr bp; 5837 memset(&sfo, 0, sizeof(sfo)); 5838 sfo.tstate = tstate; 5839 sfo.set_mask = (uint32_t)(-1); 5840 bp_alloc(&bp, 4096); 5841 show_static_rule(&g_co, &sfo, &bp, rule, NULL); 5842 printf("%s", bp.buf); 5843 bp_free(&bp); 5844 } 5845 5846 if (tbuf != NULL) 5847 free(tbuf); 5848 5849 if (ts.idx != NULL) 5850 free(ts.idx); 5851 } 5852 5853 /* 5854 * clear the counters or the log counters. 5855 * optname has the following values: 5856 * 0 (zero both counters and logging) 5857 * 1 (zero logging only) 5858 */ 5859 void 5860 ipfw_zero(int ac, char *av[], int optname) 5861 { 5862 ipfw_range_tlv rt; 5863 char const *errstr; 5864 char const *name = optname ? "RESETLOG" : "ZERO"; 5865 uint32_t arg; 5866 int failed = EX_OK; 5867 5868 optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; 5869 av++; ac--; 5870 5871 if (ac == 0) { 5872 /* clear all entries */ 5873 memset(&rt, 0, sizeof(rt)); 5874 rt.flags = IPFW_RCFLAG_ALL; 5875 if (do_range_cmd(optname, &rt) < 0) 5876 err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); 5877 if (!g_co.do_quiet) 5878 printf("%s.\n", optname == IP_FW_XZERO ? 5879 "Accounting cleared":"Logging counts reset"); 5880 5881 return; 5882 } 5883 5884 while (ac) { 5885 /* Rule number */ 5886 if (isdigit(**av)) { 5887 arg = strtonum(*av, 0, 0xffff, &errstr); 5888 if (errstr) 5889 errx(EX_DATAERR, 5890 "invalid rule number %s\n", *av); 5891 memset(&rt, 0, sizeof(rt)); 5892 rt.start_rule = arg; 5893 rt.end_rule = arg; 5894 rt.flags |= IPFW_RCFLAG_RANGE; 5895 if (g_co.use_set != 0) { 5896 rt.set = g_co.use_set - 1; 5897 rt.flags |= IPFW_RCFLAG_SET; 5898 } 5899 if (do_range_cmd(optname, &rt) != 0) { 5900 warn("rule %u: setsockopt(IP_FW_X%s)", 5901 arg, name); 5902 failed = EX_UNAVAILABLE; 5903 } else if (rt.new_set == 0) { 5904 printf("Entry %d not found\n", arg); 5905 failed = EX_UNAVAILABLE; 5906 } else if (!g_co.do_quiet) 5907 printf("Entry %d %s.\n", arg, 5908 optname == IP_FW_XZERO ? 5909 "cleared" : "logging count reset"); 5910 } else { 5911 errx(EX_USAGE, "invalid rule number ``%s''", *av); 5912 } 5913 av++; ac--; 5914 } 5915 if (failed != EX_OK) 5916 exit(failed); 5917 } 5918 5919 void 5920 ipfw_flush(int force) 5921 { 5922 ipfw_range_tlv rt; 5923 5924 if (!force && !g_co.do_quiet) { /* need to ask user */ 5925 int c; 5926 5927 printf("Are you sure? [yn] "); 5928 fflush(stdout); 5929 do { 5930 c = toupper(getc(stdin)); 5931 while (c != '\n' && getc(stdin) != '\n') 5932 if (feof(stdin)) 5933 return; /* and do not flush */ 5934 } while (c != 'Y' && c != 'N'); 5935 printf("\n"); 5936 if (c == 'N') /* user said no */ 5937 return; 5938 } 5939 if (g_co.do_pipe) { 5940 dummynet_flush(); 5941 return; 5942 } 5943 /* `ipfw set N flush` - is the same that `ipfw delete set N` */ 5944 memset(&rt, 0, sizeof(rt)); 5945 if (g_co.use_set != 0) { 5946 rt.set = g_co.use_set - 1; 5947 rt.flags = IPFW_RCFLAG_SET; 5948 } else 5949 rt.flags = IPFW_RCFLAG_ALL; 5950 if (do_range_cmd(IP_FW_XDEL, &rt) != 0) 5951 err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); 5952 if (!g_co.do_quiet) 5953 printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules"); 5954 } 5955 5956 static struct _s_x intcmds[] = { 5957 { "talist", TOK_TALIST }, 5958 { "iflist", TOK_IFLIST }, 5959 { "olist", TOK_OLIST }, 5960 { "vlist", TOK_VLIST }, 5961 { "monitor", TOK_MONITOR }, 5962 { NULL, 0 } 5963 }; 5964 5965 static struct _s_x otypes[] = { 5966 { "EACTION", IPFW_TLV_EACTION }, 5967 { "DYNSTATE", IPFW_TLV_STATE_NAME }, 5968 { NULL, 0 } 5969 }; 5970 5971 static const char* 5972 lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type) 5973 { 5974 const char *name; 5975 int i; 5976 5977 name = NULL; 5978 for (i = 0; i < cnt; i++) { 5979 if (ntlv[i].head.type != IPFW_TLV_EACTION) 5980 continue; 5981 if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type) 5982 continue; 5983 name = ntlv[i].name; 5984 break; 5985 } 5986 return (name); 5987 } 5988 5989 static void 5990 ipfw_list_objects(int ac __unused, char *av[] __unused) 5991 { 5992 ipfw_obj_lheader req, *olh; 5993 ipfw_obj_ntlv *ntlv; 5994 const char *name; 5995 size_t sz; 5996 uint32_t i; 5997 5998 memset(&req, 0, sizeof(req)); 5999 sz = sizeof(req); 6000 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0) 6001 if (errno != ENOMEM) 6002 return; 6003 6004 sz = req.size; 6005 if ((olh = calloc(1, sz)) == NULL) 6006 return; 6007 6008 olh->size = sz; 6009 if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) { 6010 free(olh); 6011 return; 6012 } 6013 6014 if (olh->count > 0) 6015 printf("Objects list:\n"); 6016 else 6017 printf("There are no objects\n"); 6018 ntlv = (ipfw_obj_ntlv *)(olh + 1); 6019 for (i = 0; i < olh->count; i++) { 6020 name = match_value(otypes, ntlv->head.type); 6021 if (name == NULL) 6022 name = lookup_eaction_name( 6023 (ipfw_obj_ntlv *)(olh + 1), olh->count, 6024 ntlv->head.type); 6025 if (name == NULL) 6026 printf(" kidx: %4d\ttype: %10d\tname: %s\n", 6027 ntlv->idx, ntlv->head.type, ntlv->name); 6028 else 6029 printf(" kidx: %4d\ttype: %10s\tname: %s\n", 6030 ntlv->idx, name, ntlv->name); 6031 ntlv++; 6032 } 6033 free(olh); 6034 } 6035 6036 static void 6037 bprint_sa(struct buf_pr *bp, const struct sockaddr *sa) 6038 { 6039 struct sockaddr_storage ss; 6040 char buf[INET6_ADDRSTRLEN]; 6041 6042 memset(&ss, 0, sizeof(ss)); 6043 if (sa->sa_len == 0) 6044 ss.ss_family = sa->sa_family; 6045 else 6046 memcpy(&ss, sa, sa->sa_len); 6047 6048 /* set ss_len in case it was shortened */ 6049 switch (sa->sa_family) { 6050 case AF_INET: 6051 ss.ss_len = sizeof(struct sockaddr_in); 6052 break; 6053 default: 6054 ss.ss_len = sizeof(struct sockaddr_in6); 6055 } 6056 if (getnameinfo((const struct sockaddr *)&ss, ss.ss_len, 6057 buf, sizeof(buf), NULL, 0, NI_NUMERICHOST) != 0) { 6058 bprintf(bp, "bad-addr"); 6059 return; 6060 } 6061 bprintf(bp, "%s", buf); 6062 } 6063 6064 static void 6065 ipfw_rtsock_monitor(const char *filter) 6066 { 6067 char msg[2048], buf[32]; 6068 struct timespec tp; 6069 struct tm tm; 6070 struct buf_pr bp; 6071 struct rt_msghdr *hdr; 6072 struct sockaddr *sa; 6073 struct sockaddr_dl *sdl; 6074 ipfwlog_rtsock_hdr_v2 *loghdr; 6075 ssize_t nread; 6076 size_t msglen; 6077 int rtsock; 6078 6079 rtsock = socket(PF_ROUTE, SOCK_RAW, AF_IPFWLOG); 6080 if (rtsock < 0) 6081 err(EX_UNAVAILABLE, "socket(AF_IPFWLOG)"); 6082 bp_alloc(&bp, 4096); 6083 for (;;) { 6084 nread = read(rtsock, msg, sizeof(msg)); 6085 if (nread < 0) { 6086 warn("read()"); 6087 continue; 6088 } 6089 msglen = nread; 6090 if (msglen < sizeof(*hdr)) 6091 continue; 6092 6093 hdr = (struct rt_msghdr *)msg; 6094 if (hdr->rtm_version != RTM_VERSION || 6095 hdr->rtm_type != RTM_IPFWLOG || 6096 (hdr->rtm_addrs & (1 << RTAX_DST)) == 0 || 6097 (hdr->rtm_addrs & (1 << RTAX_GATEWAY)) == 0 || 6098 (hdr->rtm_addrs & (1 << RTAX_NETMASK)) == 0) 6099 continue; 6100 6101 msglen -= sizeof(*hdr); 6102 sdl = (struct sockaddr_dl *)(hdr + 1); 6103 if (msglen < sizeof(*sdl) || msglen < SA_SIZE(sdl) || 6104 sdl->sdl_family != AF_IPFWLOG || 6105 sdl->sdl_type != 2 /* version */ || 6106 sdl->sdl_alen != sizeof(*loghdr)) 6107 continue; 6108 6109 msglen -= SA_SIZE(sdl); 6110 loghdr = (ipfwlog_rtsock_hdr_v2 *)sdl->sdl_data; 6111 /* filter by rule comment. MAX_COMMENT_LEN = 80 */ 6112 if (filter != NULL && 6113 strncmp(filter, loghdr->comment, 80) != 0) 6114 continue; 6115 6116 sa = (struct sockaddr *)((char *)sdl + SA_SIZE(sdl)); 6117 if (msglen < SA_SIZE(sa)) 6118 continue; 6119 6120 msglen -= SA_SIZE(sa); 6121 bp_flush(&bp); 6122 6123 clock_gettime(CLOCK_REALTIME, &tp); 6124 localtime_r(&tp.tv_sec, &tm); 6125 strftime(buf, sizeof(buf), "%T", &tm); 6126 bprintf(&bp, "%s.%03ld AF %s", buf, tp.tv_nsec / 1000000, 6127 sa->sa_family == AF_INET ? "IPv4" : "IPv6"); 6128 6129 bprintf(&bp, " %s >", 6130 ether_ntoa((const struct ether_addr *)loghdr->ether_shost)); 6131 bprintf(&bp, " %s, ", 6132 ether_ntoa((const struct ether_addr *)loghdr->ether_dhost)); 6133 bprint_sa(&bp, sa); 6134 6135 sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa)); 6136 if (msglen < SA_SIZE(sa)) 6137 continue; 6138 6139 msglen -= SA_SIZE(sa); 6140 bprintf(&bp, " > "); 6141 bprint_sa(&bp, sa); 6142 bprintf(&bp, ", set %u, rulenum %u, targ 0x%08x, " 6143 "%scmd[op %d, len %d, arg1 0x%04x], mark 0x%08x", 6144 sdl->sdl_index, loghdr->rulenum, loghdr->tablearg, 6145 (loghdr->cmd.len & F_NOT) ? "!": "", 6146 loghdr->cmd.opcode, F_LEN(&loghdr->cmd), 6147 loghdr->cmd.arg1, loghdr->mark); 6148 6149 sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa)); 6150 if ((hdr->rtm_addrs & (1 << RTAX_GENMASK)) != 0 && 6151 msglen >= SA_SIZE(sa)) { 6152 msglen -= SA_SIZE(sa); 6153 bprintf(&bp, ", nh "); 6154 bprint_sa(&bp, sa); 6155 } 6156 if (sdl->sdl_nlen > 0) 6157 bprintf(&bp, " // %s", loghdr->comment); 6158 printf("%s\n", bp.buf); 6159 } 6160 bp_free(&bp); 6161 close(rtsock); 6162 } 6163 6164 void 6165 ipfw_internal_handler(int ac, char *av[]) 6166 { 6167 int tcmd; 6168 6169 ac--; av++; 6170 NEED1("internal cmd required"); 6171 6172 if ((tcmd = match_token(intcmds, *av)) == -1) 6173 errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); 6174 6175 switch (tcmd) { 6176 case TOK_IFLIST: 6177 ipfw_list_tifaces(); 6178 break; 6179 case TOK_TALIST: 6180 ipfw_list_ta(ac, av); 6181 break; 6182 case TOK_OLIST: 6183 ipfw_list_objects(ac, av); 6184 break; 6185 case TOK_VLIST: 6186 ipfw_list_values(ac, av); 6187 break; 6188 case TOK_MONITOR: 6189 av++; 6190 ipfw_rtsock_monitor(*av); 6191 break; 6192 } 6193 } 6194 6195 static int 6196 ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) 6197 { 6198 ipfw_obj_lheader req, *olh; 6199 size_t sz; 6200 6201 memset(&req, 0, sizeof(req)); 6202 sz = sizeof(req); 6203 6204 if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) { 6205 if (errno != ENOMEM) 6206 return (errno); 6207 } 6208 6209 sz = req.size; 6210 if ((olh = calloc(1, sz)) == NULL) 6211 return (ENOMEM); 6212 6213 olh->size = sz; 6214 if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) { 6215 free(olh); 6216 return (errno); 6217 } 6218 6219 *polh = olh; 6220 return (0); 6221 } 6222 6223 static int 6224 ifinfo_cmp(const void *a, const void *b) 6225 { 6226 const ipfw_iface_info *ia, *ib; 6227 6228 ia = (const ipfw_iface_info *)a; 6229 ib = (const ipfw_iface_info *)b; 6230 6231 return (stringnum_cmp(ia->ifname, ib->ifname)); 6232 } 6233 6234 /* 6235 * Retrieves table list from kernel, 6236 * optionally sorts it and calls requested function for each table. 6237 * Returns 0 on success. 6238 */ 6239 static void 6240 ipfw_list_tifaces(void) 6241 { 6242 ipfw_obj_lheader *olh = NULL; 6243 ipfw_iface_info *info; 6244 uint32_t i; 6245 int error; 6246 6247 if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) 6248 err(EX_OSERR, "Unable to request ipfw tracked interface list"); 6249 6250 qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); 6251 6252 info = (ipfw_iface_info *)(olh + 1); 6253 for (i = 0; i < olh->count; i++) { 6254 if (info->flags & IPFW_IFFLAG_RESOLVED) 6255 printf("%s ifindex: %d refcount: %u changes: %u\n", 6256 info->ifname, info->ifindex, info->refcnt, 6257 info->gencnt); 6258 else 6259 printf("%s ifindex: unresolved refcount: %u changes: %u\n", 6260 info->ifname, info->refcnt, info->gencnt); 6261 info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); 6262 } 6263 6264 free(olh); 6265 } 6266