1 /* 2 * Copyright (c) 2002 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/param.h> 24 #include <sys/mbuf.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/sysctl.h> 28 #include <sys/time.h> 29 #include <sys/wait.h> 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <grp.h> 35 #include <limits.h> 36 #include <netdb.h> 37 #include <pwd.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <stdarg.h> 42 #include <string.h> 43 #include <timeconv.h> 44 #include <unistd.h> 45 #include <sysexits.h> 46 47 #include <net/if.h> 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_icmp.h> 52 #include <netinet/ip_fw.h> 53 #include <net/route.h> /* def. of struct route */ 54 #include <netinet/ip_dummynet.h> 55 #include <netinet/tcp.h> 56 #include <arpa/inet.h> 57 58 int s, /* main RAW socket */ 59 do_resolv, /* Would try to resolve all */ 60 do_acct, /* Show packet/byte count */ 61 do_time, /* Show time stamps */ 62 do_quiet, /* Be quiet in add and flush */ 63 do_force, /* Don't ask for confirmation */ 64 do_pipe, /* this cmd refers to a pipe */ 65 do_sort, /* field to sort results (0 = no) */ 66 do_dynamic, /* display dynamic rules */ 67 do_expired, /* display expired dynamic rules */ 68 verbose; 69 70 #define IP_MASK_ALL 0xffffffff 71 72 /* 73 * structure to hold flag names and associated values to be 74 * set in the appropriate masks. 75 * A NULL string terminates the array. 76 * Often, an element with 0 value contains an error string. 77 * 78 */ 79 struct _s_x { 80 char *s; 81 int x; 82 }; 83 84 static struct _s_x f_tcpflags[] = { 85 { "syn", TH_SYN }, 86 { "fin", TH_FIN }, 87 { "ack", TH_ACK }, 88 { "psh", TH_PUSH }, 89 { "rst", TH_RST }, 90 { "urg", TH_URG }, 91 { "tcp flag", 0 }, 92 { NULL, 0 } 93 }; 94 95 static struct _s_x f_tcpopts[] = { 96 { "mss", IP_FW_TCPOPT_MSS }, 97 { "maxseg", IP_FW_TCPOPT_MSS }, 98 { "window", IP_FW_TCPOPT_WINDOW }, 99 { "sack", IP_FW_TCPOPT_SACK }, 100 { "ts", IP_FW_TCPOPT_TS }, 101 { "timestamp", IP_FW_TCPOPT_TS }, 102 { "cc", IP_FW_TCPOPT_CC }, 103 { "tcp option", 0 }, 104 { NULL, 0 } 105 }; 106 107 /* 108 * IP options span the range 0 to 255 so we need to remap them 109 * (though in fact only the low 5 bits are significant). 110 */ 111 static struct _s_x f_ipopts[] = { 112 { "ssrr", IP_FW_IPOPT_SSRR}, 113 { "lsrr", IP_FW_IPOPT_LSRR}, 114 { "rr", IP_FW_IPOPT_RR}, 115 { "ts", IP_FW_IPOPT_TS}, 116 { "ip option", 0 }, 117 { NULL, 0 } 118 }; 119 120 static struct _s_x f_iptos[] = { 121 { "lowdelay", IPTOS_LOWDELAY}, 122 { "throughput", IPTOS_THROUGHPUT}, 123 { "reliability", IPTOS_RELIABILITY}, 124 { "mincost", IPTOS_MINCOST}, 125 { "congestion", IPTOS_CE}, 126 { "ecntransport", IPTOS_ECT}, 127 { "ip tos option", 0}, 128 { NULL, 0 } 129 }; 130 131 static struct _s_x limit_masks[] = { 132 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 133 {"src-addr", DYN_SRC_ADDR}, 134 {"src-port", DYN_SRC_PORT}, 135 {"dst-addr", DYN_DST_ADDR}, 136 {"dst-port", DYN_DST_PORT}, 137 {NULL, 0} 138 }; 139 140 /* 141 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 142 * This is only used in this code. 143 */ 144 #define IPPROTO_ETHERTYPE 0x1000 145 static struct _s_x ether_types[] = { 146 /* 147 * Note, we cannot use "-:&/" in the names because they are field 148 * separators in the type specifications. Also, we use s = NULL as 149 * end-delimiter, because a type of 0 can be legal. 150 */ 151 { "ip", 0x0800 }, 152 { "ipv4", 0x0800 }, 153 { "ipv6", 0x86dd }, 154 { "arp", 0x0806 }, 155 { "rarp", 0x8035 }, 156 { "vlan", 0x8100 }, 157 { "loop", 0x9000 }, 158 { "trail", 0x1000 }, 159 { "at", 0x809b }, 160 { "atalk", 0x809b }, 161 { "aarp", 0x80f3 }, 162 { "pppoe_disc", 0x8863 }, 163 { "pppoe_sess", 0x8864 }, 164 { "ipx_8022", 0x00E0 }, 165 { "ipx_8023", 0x0000 }, 166 { "ipx_ii", 0x8137 }, 167 { "ipx_snap", 0x8137 }, 168 { "ipx", 0x8137 }, 169 { "ns", 0x0600 }, 170 { NULL, 0 } 171 }; 172 173 static void show_usage(void); 174 175 enum tokens { 176 TOK_NULL=0, 177 178 TOK_OR, 179 TOK_NOT, 180 181 TOK_ACCEPT, 182 TOK_COUNT, 183 TOK_PIPE, 184 TOK_QUEUE, 185 TOK_DIVERT, 186 TOK_TEE, 187 TOK_FORWARD, 188 TOK_SKIPTO, 189 TOK_DENY, 190 TOK_REJECT, 191 TOK_RESET, 192 TOK_UNREACH, 193 TOK_CHECKSTATE, 194 195 TOK_UID, 196 TOK_GID, 197 TOK_IN, 198 TOK_LIMIT, 199 TOK_KEEPSTATE, 200 TOK_LAYER2, 201 TOK_OUT, 202 TOK_XMIT, 203 TOK_RECV, 204 TOK_VIA, 205 TOK_FRAG, 206 TOK_IPOPTS, 207 TOK_IPLEN, 208 TOK_IPID, 209 TOK_IPPRECEDENCE, 210 TOK_IPTOS, 211 TOK_IPTTL, 212 TOK_IPVER, 213 TOK_ESTAB, 214 TOK_SETUP, 215 TOK_TCPFLAGS, 216 TOK_TCPOPTS, 217 TOK_TCPSEQ, 218 TOK_TCPACK, 219 TOK_TCPWIN, 220 TOK_ICMPTYPES, 221 222 TOK_PLR, 223 TOK_BUCKETS, 224 TOK_DSTIP, 225 TOK_SRCIP, 226 TOK_DSTPORT, 227 TOK_SRCPORT, 228 TOK_ALL, 229 TOK_MASK, 230 TOK_BW, 231 TOK_DELAY, 232 TOK_RED, 233 TOK_GRED, 234 TOK_DROPTAIL, 235 TOK_PROTO, 236 TOK_WEIGHT, 237 }; 238 239 struct _s_x dummynet_params[] = { 240 { "plr", TOK_PLR }, 241 { "buckets", TOK_BUCKETS }, 242 { "dst-ip", TOK_DSTIP }, 243 { "src-ip", TOK_SRCIP }, 244 { "dst-port", TOK_DSTPORT }, 245 { "src-port", TOK_SRCPORT }, 246 { "proto", TOK_PROTO }, 247 { "weight", TOK_WEIGHT }, 248 { "all", TOK_ALL }, 249 { "mask", TOK_MASK }, 250 { "droptail", TOK_DROPTAIL }, 251 { "red", TOK_RED }, 252 { "gred", TOK_GRED }, 253 { "bw", TOK_BW }, 254 { "bandwidth", TOK_BW }, 255 { "delay", TOK_DELAY }, 256 { "pipe", TOK_PIPE }, 257 { "queue", TOK_QUEUE }, 258 { "dummynet-params", TOK_NULL }, 259 { NULL, 0 } 260 }; 261 262 struct _s_x rule_actions[] = { 263 { "accept", TOK_ACCEPT }, 264 { "pass", TOK_ACCEPT }, 265 { "allow", TOK_ACCEPT }, 266 { "permit", TOK_ACCEPT }, 267 { "count", TOK_COUNT }, 268 { "pipe", TOK_PIPE }, 269 { "queue", TOK_QUEUE }, 270 { "divert", TOK_DIVERT }, 271 { "tee", TOK_TEE }, 272 { "fwd", TOK_FORWARD }, 273 { "forward", TOK_FORWARD }, 274 { "skipto", TOK_SKIPTO }, 275 { "deny", TOK_DENY }, 276 { "drop", TOK_DENY }, 277 { "reject", TOK_REJECT }, 278 { "reset", TOK_RESET }, 279 { "unreach", TOK_UNREACH }, 280 { "check-state", TOK_CHECKSTATE }, 281 { NULL, TOK_NULL }, 282 { NULL, 0 } 283 }; 284 285 struct _s_x rule_options[] = { 286 { "uid", TOK_UID }, 287 { "gid", TOK_GID }, 288 { "in", TOK_IN }, 289 { "limit", TOK_LIMIT }, 290 { "keep-state", TOK_KEEPSTATE }, 291 { "bridged", TOK_LAYER2 }, 292 { "layer2", TOK_LAYER2 }, 293 { "out", TOK_OUT }, 294 { "xmit", TOK_XMIT }, 295 { "recv", TOK_RECV }, 296 { "via", TOK_VIA }, 297 { "fragment", TOK_FRAG }, 298 { "frag", TOK_FRAG }, 299 { "ipoptions", TOK_IPOPTS }, 300 { "ipopts", TOK_IPOPTS }, 301 { "iplen", TOK_IPLEN }, 302 { "ipid", TOK_IPID }, 303 { "ipprecedence", TOK_IPPRECEDENCE }, 304 { "iptos", TOK_IPTOS }, 305 { "ipttl", TOK_IPTTL }, 306 { "ipversion", TOK_IPVER }, 307 { "ipver", TOK_IPVER }, 308 { "estab", TOK_ESTAB }, 309 { "established", TOK_ESTAB }, 310 { "setup", TOK_SETUP }, 311 { "tcpflags", TOK_TCPFLAGS }, 312 { "tcpflgs", TOK_TCPFLAGS }, 313 { "tcpoptions", TOK_TCPOPTS }, 314 { "tcpopts", TOK_TCPOPTS }, 315 { "tcpseq", TOK_TCPSEQ }, 316 { "tcpack", TOK_TCPACK }, 317 { "tcpwin", TOK_TCPWIN }, 318 { "icmptypes", TOK_ICMPTYPES }, 319 320 { "not", TOK_NOT }, /* pseudo option */ 321 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 322 { "or", TOK_OR }, /* pseudo option */ 323 { "|", /* escape */ TOK_OR }, /* pseudo option */ 324 { NULL, TOK_NULL }, 325 { NULL, 0 } 326 }; 327 328 /** 329 * match_token takes a table and a string, returns the value associated 330 * with the string (0 meaning an error in most cases) 331 */ 332 static int 333 match_token(struct _s_x *table, char *string) 334 { 335 struct _s_x *pt; 336 int i = strlen(string); 337 338 for (pt = table ; i && pt->s != NULL ; pt++) 339 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 340 return pt->x; 341 return -1; 342 }; 343 344 static char * 345 match_value(struct _s_x *p, u_int32_t value) 346 { 347 for (; p->s != NULL; p++) 348 if (p->x == value) 349 return p->s; 350 return NULL; 351 } 352 353 /* 354 * prints one port, symbolic or numeric 355 */ 356 static void 357 print_port(int proto, u_int16_t port) 358 { 359 360 if (proto == IPPROTO_ETHERTYPE) { 361 char *s; 362 363 if (do_resolv && (s = match_value(ether_types, port)) ) 364 printf("%s", s); 365 else 366 printf("0x%04x", port); 367 } else { 368 struct servent *se = NULL; 369 if (do_resolv) { 370 struct protoent *pe = getprotobynumber(proto); 371 372 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 373 } 374 if (se) 375 printf("%s", se->s_name); 376 else 377 printf("%d", port); 378 } 379 } 380 381 /* 382 * print the values in a list of ports 383 * XXX todo: add support for mask. 384 */ 385 static void 386 print_newports(ipfw_insn_u16 *cmd, int proto) 387 { 388 u_int16_t *p = cmd->ports; 389 int i; 390 char *sep= " "; 391 392 if (cmd->o.len & F_NOT) 393 printf(" not"); 394 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 395 printf(sep); 396 print_port(proto, p[0]); 397 if (p[0] != p[1]) { 398 printf("-"); 399 print_port(proto, p[1]); 400 } 401 sep = ","; 402 } 403 } 404 405 /* 406 * Like strtol, but also translates service names into port numbers 407 * for some protocols. 408 * In particular: 409 * proto == -1 disables the protocol check; 410 * proto == IPPROTO_ETHERTYPE looks up an internal table 411 * proto == <some value in /etc/protocols> matches the values there. 412 */ 413 static int 414 strtoport(char *s, char **end, int base, int proto) 415 { 416 char *s1, sep; 417 int i; 418 419 if ( *s == '\0') 420 goto none; 421 422 if (isdigit(*s)) 423 return strtol(s, end, base); 424 425 /* 426 * find separator and replace with a '\0' 427 */ 428 for (s1 = s; *s1 && isalnum(*s1) ; s1++) 429 ; 430 sep = *s1; 431 *s1 = '\0'; 432 433 if (proto == IPPROTO_ETHERTYPE) { 434 i = match_token(ether_types, s); 435 *s1 = sep; 436 if (i == -1) { /* not found */ 437 *end = s; 438 return 0; 439 } else { 440 *end = s1; 441 return i; 442 } 443 } else { 444 struct protoent *pe = NULL; 445 struct servent *se; 446 447 if (proto != 0) 448 pe = getprotobynumber(proto); 449 setservent(1); 450 se = getservbyname(s, pe ? pe->p_name : NULL); 451 *s1 = sep; 452 if (se != NULL) { 453 *end = s1; 454 return ntohs(se->s_port); 455 } 456 } 457 none: 458 *end = s; 459 return 0; 460 } 461 462 /* 463 * fill the body of the command with the list of port ranges. 464 * At the moment it only understands numeric ranges. 465 */ 466 static int 467 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 468 { 469 u_int16_t *p = cmd->ports; 470 int i = 0; 471 472 for (; *av ; i++, p +=2 ) { 473 u_int16_t a, b; 474 char *s; 475 476 a = strtoport(av, &s, 0, proto); 477 if (s == av) /* no parameter */ 478 break; 479 if (*s == '-') { /* a range */ 480 av = s+1; 481 b = strtoport(av, &s, 0, proto); 482 if (s == av) /* no parameter */ 483 break; 484 p[0] = a; 485 p[1] = b; 486 } else if (*s == ',' || *s == '\0' ) { 487 p[0] = p[1] = a; 488 } else /* invalid separator */ 489 break; 490 av = s+1; 491 } 492 if (i > 0) { 493 if (i+1 > F_LEN_MASK) 494 errx(EX_DATAERR, "too many port range\n"); 495 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 496 } 497 return i; 498 } 499 500 static struct _s_x icmpcodes[] = { 501 { "net", ICMP_UNREACH_NET }, 502 { "host", ICMP_UNREACH_HOST }, 503 { "protocol", ICMP_UNREACH_PROTOCOL }, 504 { "port", ICMP_UNREACH_PORT }, 505 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 506 { "srcfail", ICMP_UNREACH_SRCFAIL }, 507 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 508 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 509 { "isolated", ICMP_UNREACH_ISOLATED }, 510 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 511 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 512 { "tosnet", ICMP_UNREACH_TOSNET }, 513 { "toshost", ICMP_UNREACH_TOSHOST }, 514 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 515 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 516 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 517 { NULL, 0 } 518 }; 519 520 static void 521 fill_reject_code(u_short *codep, char *str) 522 { 523 int val; 524 char *s; 525 526 val = strtoul(str, &s, 0); 527 if (s == str || *s != '\0' || val >= 0x100) 528 val = match_token(icmpcodes, str); 529 if (val <= 0) 530 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 531 *codep = val; 532 return; 533 } 534 535 static void 536 print_reject_code(u_int16_t code) 537 { 538 char *s = match_value(icmpcodes, code); 539 540 if (s != NULL) 541 printf("unreach %s", s); 542 else 543 printf("unreach %u", code); 544 } 545 546 /* 547 * Returns the number of bits set (from left) in a contiguous bitmask, 548 * or -1 if the mask is not contiguous. 549 * XXX this needs a proper fix. 550 * This effectively works on masks in big-endian (network) format. 551 * when compiled on little endian architectures. 552 * 553 * First bit is bit 7 of the first byte -- note, for MAC addresses, 554 * the first bit on the wire is bit 0 of the first byte. 555 * len is the max length in bits. 556 */ 557 static int 558 contigmask(u_char *p, int len) 559 { 560 int i, n; 561 for (i=0; i<len ; i++) 562 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 563 break; 564 for (n=i+1; n < len; n++) 565 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 566 return -1; /* mask not contiguous */ 567 return i; 568 } 569 570 /* 571 * print flags set/clear in the two bitmasks passed as parameters. 572 * There is a specialized check for f_tcpflags. 573 */ 574 static void 575 print_flags(char *name, ipfw_insn *cmd, struct _s_x *list) 576 { 577 char *comma=""; 578 int i; 579 u_char set = cmd->arg1 & 0xff; 580 u_char clear = (cmd->arg1 >> 8) & 0xff; 581 582 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 583 printf(" setup"); 584 return; 585 } 586 587 printf(" %s ", name); 588 for (i=0; list[i].x != 0; i++) { 589 if (set & list[i].x) { 590 set &= ~list[i].x; 591 printf("%s%s", comma, list[i].s); 592 comma = ","; 593 } 594 if (clear & list[i].x) { 595 clear &= ~list[i].x; 596 printf("%s!%s", comma, list[i].s); 597 comma = ","; 598 } 599 } 600 } 601 602 /* 603 * Print the ip address contained in a command. 604 */ 605 static void 606 print_ip(ipfw_insn_ip *cmd) 607 { 608 struct hostent *he = NULL; 609 int mb; 610 611 printf("%s ", cmd->o.len & F_NOT ? " not": ""); 612 613 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 614 printf("me"); 615 return; 616 } 617 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 618 u_int32_t x, *d; 619 int i; 620 char comma = '{'; 621 622 x = cmd->o.arg1 - 1; 623 x = htonl( ~x ); 624 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 625 printf("%s/%d", inet_ntoa(cmd->addr), 626 contigmask((u_char *)&x, 32)); 627 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 628 x &= 0xff; /* base */ 629 d = (u_int32_t *)&(cmd->mask); 630 for (i=0; i < cmd->o.arg1; i++) 631 if (d[ i/32] & (1<<(i & 31))) { 632 printf("%c%d", comma, i+x); 633 comma = ','; 634 } 635 printf("}"); 636 return; 637 } 638 if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) 639 mb = 32; 640 else 641 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32); 642 if (mb == 32 && do_resolv) 643 he = gethostbyaddr((char *)&(cmd->addr.s_addr), 644 sizeof(u_long), AF_INET); 645 if (he != NULL) /* resolved to name */ 646 printf("%s", he->h_name); 647 else if (mb == 0) /* any */ 648 printf("any"); 649 else { /* numeric IP followed by some kind of mask */ 650 printf("%s", inet_ntoa(cmd->addr)); 651 if (mb < 0) 652 printf(":%s", inet_ntoa(cmd->mask)); 653 else if (mb < 32) 654 printf("/%d", mb); 655 } 656 } 657 658 /* 659 * prints a MAC address/mask pair 660 */ 661 static void 662 print_mac(u_char *addr, u_char *mask) 663 { 664 int l = contigmask(mask, 48); 665 666 if (l == 0) 667 printf(" any"); 668 else { 669 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 670 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 671 if (l == -1) 672 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 673 mask[0], mask[1], mask[2], 674 mask[3], mask[4], mask[5]); 675 else if (l < 48) 676 printf("/%d", l); 677 } 678 } 679 680 static void 681 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 682 { 683 u_int8_t type; 684 685 cmd->d[0] = 0; 686 while (*av) { 687 if (*av == ',') 688 av++; 689 690 type = strtoul(av, &av, 0); 691 692 if (*av != ',' && *av != '\0') 693 errx(EX_DATAERR, "invalid ICMP type"); 694 695 if (type > 31) 696 errx(EX_DATAERR, "ICMP type out of range"); 697 698 cmd->d[0] |= 1 << type; 699 } 700 cmd->o.opcode = O_ICMPTYPE; 701 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 702 } 703 704 static void 705 print_icmptypes(ipfw_insn_u32 *cmd) 706 { 707 int i; 708 char sep= ' '; 709 710 printf(" icmptypes"); 711 for (i = 0; i < 32; i++) { 712 if ( (cmd->d[0] & (1 << (i))) == 0) 713 continue; 714 printf("%c%d", sep, i); 715 sep = ','; 716 } 717 } 718 719 /* 720 * show_ipfw() prints the body of an ipfw rule. 721 * Because the standard rule has at least proto src_ip dst_ip, we use 722 * a helper function to produce these entries if not provided explicitly. 723 */ 724 #define HAVE_PROTO 1 725 #define HAVE_SRCIP 2 726 #define HAVE_DSTIP 4 727 #define HAVE_MAC 8 728 729 static void 730 show_prerequisites(int *flags, int want) 731 { 732 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 733 printf(" ip"); 734 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 735 printf(" from any"); 736 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 737 printf(" to any"); 738 *flags |= want; 739 } 740 741 static void 742 show_ipfw(struct ip_fw *rule) 743 { 744 int l; 745 ipfw_insn *cmd; 746 int proto = 0; /* default */ 747 int flags = 0; /* prerequisites */ 748 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 749 int or_block = 0; /* we are in an or block */ 750 751 printf("%05u ", rule->rulenum); 752 753 if (do_acct) 754 printf("%10qu %10qu ", rule->pcnt, rule->bcnt); 755 756 if (do_time) { 757 if (rule->timestamp) { 758 char timestr[30]; 759 time_t t = _long_to_time(rule->timestamp); 760 761 strcpy(timestr, ctime(&t)); 762 *strchr(timestr, '\n') = '\0'; 763 printf("%s ", timestr); 764 } else { 765 printf(" "); 766 } 767 } 768 769 /* 770 * first print actions 771 */ 772 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 773 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 774 switch(cmd->opcode) { 775 case O_CHECK_STATE: 776 printf("check-state"); 777 /* avoid printing anything else */ 778 flags = HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP; 779 break; 780 781 case O_PROB: 782 { 783 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 784 double d = 1.0 * p->d[0]; 785 786 d = 1 - (d / 0x7fffffff); 787 printf("prob %f ", d); 788 } 789 break; 790 791 case O_ACCEPT: 792 printf("allow"); 793 break; 794 795 case O_COUNT: 796 printf("count"); 797 break; 798 799 case O_DENY: 800 printf("deny"); 801 break; 802 803 case O_REJECT: 804 if (cmd->arg1 == ICMP_REJECT_RST) 805 printf("reset"); 806 else if (cmd->arg1 == ICMP_UNREACH_HOST) 807 printf("reject"); 808 else 809 print_reject_code(cmd->arg1); 810 break; 811 812 case O_SKIPTO: 813 printf("skipto %u", cmd->arg1); 814 break; 815 816 case O_PIPE: 817 printf("pipe %u", cmd->arg1); 818 break; 819 820 case O_QUEUE: 821 printf("queue %u", cmd->arg1); 822 break; 823 824 case O_DIVERT: 825 printf("divert %u", cmd->arg1); 826 break; 827 828 case O_TEE: 829 printf("tee %u", cmd->arg1); 830 break; 831 832 case O_FORWARD_IP: 833 { 834 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 835 836 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 837 if (s->sa.sin_port) 838 printf(",%d", ntohs(s->sa.sin_port)); 839 } 840 break; 841 842 case O_LOG: /* O_LOG is printed last */ 843 logptr = (ipfw_insn_log *)cmd; 844 break; 845 846 default: 847 printf("** unrecognized action %d len %d", 848 cmd->opcode, cmd->len); 849 } 850 } 851 if (logptr) { 852 if (logptr->max_log > 0) 853 printf(" log logamount %d ", logptr->max_log); 854 else 855 printf(" log "); 856 } 857 /* 858 * then print the body 859 */ 860 for (l = rule->act_ofs, cmd = rule->cmd ; 861 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 862 /* useful alias */ 863 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 864 865 switch(cmd->opcode) { 866 case O_PROBE_STATE: 867 break; /* no need to print anything here */ 868 869 case O_MACADDR2: { 870 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 871 if ( (flags & HAVE_MAC) == 0) 872 printf(" MAC"); 873 flags |= HAVE_MAC; 874 if (cmd->len & F_NOT) 875 printf(" not"); 876 print_mac( m->addr, m->mask); 877 print_mac( m->addr + 6, m->mask + 6); 878 } 879 break; 880 881 case O_MAC_TYPE: 882 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE); 883 break; 884 885 case O_IP_SRC: 886 case O_IP_SRC_MASK: 887 case O_IP_SRC_ME: 888 case O_IP_SRC_SET: 889 show_prerequisites(&flags, HAVE_PROTO); 890 if (!(flags & HAVE_SRCIP)) 891 printf(" from"); 892 if ((cmd->len & F_OR) && !or_block) 893 printf(" {"); 894 print_ip((ipfw_insn_ip *)cmd); 895 flags |= HAVE_SRCIP; 896 break; 897 898 case O_IP_DST: 899 case O_IP_DST_MASK: 900 case O_IP_DST_ME: 901 case O_IP_DST_SET: 902 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP); 903 if (!(flags & HAVE_DSTIP)) 904 printf(" to"); 905 if ((cmd->len & F_OR) && !or_block) 906 printf(" {"); 907 print_ip((ipfw_insn_ip *)cmd); 908 flags |= HAVE_DSTIP; 909 break; 910 911 case O_IP_DSTPORT: 912 show_prerequisites(&flags, 913 HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP); 914 case O_IP_SRCPORT: 915 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP); 916 print_newports((ipfw_insn_u16 *)cmd, proto); 917 break; 918 919 case O_PROTO: { 920 struct protoent *pe; 921 922 if ((cmd->len & F_OR) && !or_block) 923 printf(" {"); 924 if (cmd->len & F_NOT) 925 printf(" not"); 926 proto = cmd->arg1; 927 pe = getprotobynumber(cmd->arg1); 928 if (pe) 929 printf(" %s", pe->p_name); 930 else 931 printf(" %u", cmd->arg1); 932 } 933 flags |= HAVE_PROTO; 934 break; 935 936 default: /*options ... */ 937 show_prerequisites(&flags, 938 HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP); 939 if ((cmd->len & F_OR) && !or_block) 940 printf(" {"); 941 if (cmd->len & F_NOT && cmd->opcode != O_IN) 942 printf(" not"); 943 switch(cmd->opcode) { 944 case O_FRAG: 945 printf(" frag"); 946 break; 947 948 case O_IN: 949 printf(cmd->len & F_NOT ? " out" : " in"); 950 break; 951 952 case O_LAYER2: 953 printf(" layer2"); 954 break; 955 case O_XMIT: 956 case O_RECV: 957 case O_VIA: { 958 char *s; 959 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 960 961 if (cmd->opcode == O_XMIT) 962 s = "xmit"; 963 else if (cmd->opcode == O_RECV) 964 s = "recv"; 965 else if (cmd->opcode == O_VIA) 966 s = "via"; 967 if (cmdif->name[0] == '\0') 968 printf(" %s %s", s, 969 inet_ntoa(cmdif->p.ip)); 970 else if (cmdif->p.unit == -1) 971 printf(" %s %s*", s, cmdif->name); 972 else 973 printf(" %s %s%d", s, cmdif->name, 974 cmdif->p.unit); 975 } 976 break; 977 978 case O_IPID: 979 printf(" ipid %u", cmd->arg1 ); 980 break; 981 982 case O_IPTTL: 983 printf(" ipttl %u", cmd->arg1 ); 984 break; 985 986 case O_IPVER: 987 printf(" ipver %u", cmd->arg1 ); 988 break; 989 990 case O_IPPRECEDENCE: 991 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 992 break; 993 994 case O_IPLEN: 995 printf(" iplen %u", cmd->arg1 ); 996 break; 997 998 case O_IPOPTS: 999 print_flags("ipoptions", cmd, f_ipopts); 1000 break; 1001 1002 case O_IPTOS: 1003 print_flags("iptos", cmd, f_iptos); 1004 break; 1005 1006 case O_ICMPTYPE: 1007 print_icmptypes((ipfw_insn_u32 *)cmd); 1008 break; 1009 1010 case O_ESTAB: 1011 printf(" established"); 1012 break; 1013 1014 case O_TCPFLAGS: 1015 print_flags("tcpflags", cmd, f_tcpflags); 1016 break; 1017 1018 case O_TCPOPTS: 1019 print_flags("tcpoptions", cmd, f_tcpopts); 1020 break; 1021 1022 case O_TCPWIN: 1023 printf(" tcpwin %d", ntohs(cmd->arg1)); 1024 break; 1025 1026 case O_TCPACK: 1027 printf(" tcpack %d", ntohl(cmd32->d[0])); 1028 break; 1029 1030 case O_TCPSEQ: 1031 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1032 break; 1033 1034 case O_UID: 1035 { 1036 struct passwd *pwd = getpwuid(cmd32->d[0]); 1037 1038 if (pwd) 1039 printf(" uid %s", pwd->pw_name); 1040 else 1041 printf(" uid %u", cmd32->d[0]); 1042 } 1043 break; 1044 1045 case O_GID: 1046 { 1047 struct group *grp = getgrgid(cmd32->d[0]); 1048 1049 if (grp) 1050 printf(" gid %s", grp->gr_name); 1051 else 1052 printf(" gid %u", cmd32->d[0]); 1053 } 1054 break; 1055 1056 case O_KEEP_STATE: 1057 printf(" keep-state"); 1058 break; 1059 1060 case O_LIMIT: 1061 { 1062 struct _s_x *p = limit_masks; 1063 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1064 u_int8_t x = c->limit_mask; 1065 char *comma = " "; 1066 1067 printf(" limit"); 1068 for ( ; p->x != 0 ; p++) 1069 if (x & p->x) { 1070 x &= ~p->x; 1071 printf("%s%s", comma, p->s); 1072 comma = ","; 1073 } 1074 printf(" %d", c->conn_limit); 1075 } 1076 break; 1077 1078 default: 1079 printf(" [opcode %d len %d]", 1080 cmd->opcode, cmd->len); 1081 } 1082 } 1083 if (cmd->len & F_OR) { 1084 printf(" or"); 1085 or_block = 1; 1086 } else if (or_block) { 1087 printf(" }"); 1088 or_block = 0; 1089 } 1090 } 1091 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP); 1092 1093 printf("\n"); 1094 } 1095 1096 static void 1097 show_dyn_ipfw(ipfw_dyn_rule *d) 1098 { 1099 struct protoent *pe; 1100 struct in_addr a; 1101 1102 if (!do_expired) { 1103 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1104 return; 1105 } 1106 1107 printf("%05d %10qu %10qu (%ds)", 1108 (int)(d->rule), d->pcnt, d->bcnt, d->expire); 1109 switch (d->dyn_type) { 1110 case O_LIMIT_PARENT: 1111 printf(" PARENT %d", d->count); 1112 break; 1113 case O_LIMIT: 1114 printf(" LIMIT"); 1115 break; 1116 case O_KEEP_STATE: /* bidir, no mask */ 1117 printf(" STATE"); 1118 break; 1119 } 1120 1121 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1122 printf(" %s", pe->p_name); 1123 else 1124 printf(" proto %u", d->id.proto); 1125 1126 a.s_addr = htonl(d->id.src_ip); 1127 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1128 1129 a.s_addr = htonl(d->id.dst_ip); 1130 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1131 printf("\n"); 1132 } 1133 1134 int 1135 sort_q(const void *pa, const void *pb) 1136 { 1137 int rev = (do_sort < 0); 1138 int field = rev ? -do_sort : do_sort; 1139 long long res = 0; 1140 const struct dn_flow_queue *a = pa; 1141 const struct dn_flow_queue *b = pb; 1142 1143 switch (field) { 1144 case 1: /* pkts */ 1145 res = a->len - b->len; 1146 break; 1147 case 2: /* bytes */ 1148 res = a->len_bytes - b->len_bytes; 1149 break; 1150 1151 case 3: /* tot pkts */ 1152 res = a->tot_pkts - b->tot_pkts; 1153 break; 1154 1155 case 4: /* tot bytes */ 1156 res = a->tot_bytes - b->tot_bytes; 1157 break; 1158 } 1159 if (res < 0) 1160 res = -1; 1161 if (res > 0) 1162 res = 1; 1163 return (int)(rev ? res : -res); 1164 } 1165 1166 static void 1167 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1168 { 1169 int l; 1170 1171 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1172 fs->flow_mask.proto, 1173 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1174 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1175 if (fs->rq_elements == 0) 1176 return; 1177 1178 printf("BKT Prot ___Source IP/port____ " 1179 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1180 if (do_sort != 0) 1181 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1182 for (l = 0; l < fs->rq_elements; l++) { 1183 struct in_addr ina; 1184 struct protoent *pe; 1185 1186 ina.s_addr = htonl(q[l].id.src_ip); 1187 printf("%3d ", q[l].hash_slot); 1188 pe = getprotobynumber(q[l].id.proto); 1189 if (pe) 1190 printf("%-4s ", pe->p_name); 1191 else 1192 printf("%4u ", q[l].id.proto); 1193 printf("%15s/%-5d ", 1194 inet_ntoa(ina), q[l].id.src_port); 1195 ina.s_addr = htonl(q[l].id.dst_ip); 1196 printf("%15s/%-5d ", 1197 inet_ntoa(ina), q[l].id.dst_port); 1198 printf("%4qu %8qu %2u %4u %3u\n", 1199 q[l].tot_pkts, q[l].tot_bytes, 1200 q[l].len, q[l].len_bytes, q[l].drops); 1201 if (verbose) 1202 printf(" S %20qd F %20qd\n", 1203 q[l].S, q[l].F); 1204 } 1205 } 1206 1207 static void 1208 print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1209 { 1210 int l; 1211 char qs[30]; 1212 char plr[30]; 1213 char red[90]; /* Display RED parameters */ 1214 1215 l = fs->qsize; 1216 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1217 if (l >= 8192) 1218 sprintf(qs, "%d KB", l / 1024); 1219 else 1220 sprintf(qs, "%d B", l); 1221 } else 1222 sprintf(qs, "%3d sl.", l); 1223 if (fs->plr) 1224 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1225 else 1226 plr[0] = '\0'; 1227 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1228 sprintf(red, 1229 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1230 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1231 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1232 SCALE_VAL(fs->min_th), 1233 SCALE_VAL(fs->max_th), 1234 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1235 else 1236 sprintf(red, "droptail"); 1237 1238 printf("%s %s%s %d queues (%d buckets) %s\n", 1239 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1240 } 1241 1242 static void 1243 list_pipes(void *data, int nbytes, int ac, char *av[]) 1244 { 1245 u_long rulenum; 1246 void *next = data; 1247 struct dn_pipe *p = (struct dn_pipe *) data; 1248 struct dn_flow_set *fs; 1249 struct dn_flow_queue *q; 1250 int l; 1251 1252 if (ac > 0) 1253 rulenum = strtoul(*av++, NULL, 10); 1254 else 1255 rulenum = 0; 1256 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1257 double b = p->bandwidth; 1258 char buf[30]; 1259 char prefix[80]; 1260 1261 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1262 break; /* done with pipes, now queues */ 1263 1264 /* 1265 * compute length, as pipe have variable size 1266 */ 1267 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1268 next = (void *)p + l; 1269 nbytes -= l; 1270 1271 if (rulenum != 0 && rulenum != p->pipe_nr) 1272 continue; 1273 1274 /* 1275 * Print rate (or clocking interface) 1276 */ 1277 if (p->if_name[0] != '\0') 1278 sprintf(buf, "%s", p->if_name); 1279 else if (b == 0) 1280 sprintf(buf, "unlimited"); 1281 else if (b >= 1000000) 1282 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1283 else if (b >= 1000) 1284 sprintf(buf, "%7.3f Kbit/s", b/1000); 1285 else 1286 sprintf(buf, "%7.3f bit/s ", b); 1287 1288 sprintf(prefix, "%05d: %s %4d ms ", 1289 p->pipe_nr, buf, p->delay); 1290 print_flowset_parms(&(p->fs), prefix); 1291 if (verbose) 1292 printf(" V %20qd\n", p->V >> MY_M); 1293 1294 q = (struct dn_flow_queue *)(p+1); 1295 list_queues(&(p->fs), q); 1296 } 1297 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1298 char prefix[80]; 1299 1300 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1301 break; 1302 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1303 next = (void *)fs + l; 1304 nbytes -= l; 1305 q = (struct dn_flow_queue *)(fs+1); 1306 sprintf(prefix, "q%05d: weight %d pipe %d ", 1307 fs->fs_nr, fs->weight, fs->parent_nr); 1308 print_flowset_parms(fs, prefix); 1309 list_queues(fs, q); 1310 } 1311 } 1312 1313 static void 1314 list(int ac, char *av[]) 1315 { 1316 struct ip_fw *r; 1317 ipfw_dyn_rule *dynrules, *d; 1318 1319 void *lim, *data = NULL; 1320 int n, nbytes, nstat, ndyn; 1321 int exitval = EX_OK; 1322 int lac; 1323 char **lav; 1324 u_long rnum; 1325 char *endptr; 1326 int seen = 0; 1327 1328 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1329 int nalloc = 1024; /* start somewhere... */ 1330 1331 ac--; 1332 av++; 1333 1334 /* get rules or pipes from kernel, resizing array as necessary */ 1335 nbytes = nalloc; 1336 1337 while (nbytes >= nalloc) { 1338 nalloc = nalloc * 2 + 200; 1339 nbytes = nalloc; 1340 if ((data = realloc(data, nbytes)) == NULL) 1341 err(EX_OSERR, "realloc"); 1342 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0) 1343 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1344 do_pipe ? "DUMMYNET" : "FW"); 1345 } 1346 1347 if (do_pipe) { 1348 list_pipes(data, nbytes, ac, av); 1349 goto done; 1350 } 1351 1352 /* 1353 * Count static rules. They have variable size so we 1354 * need to scan the list to count them. 1355 */ 1356 for (nstat = 1, r = data, lim = data + nbytes; 1357 r->rulenum < 65535 && (void *)r < lim; 1358 ++nstat, r = (void *)r + RULESIZE(r) ) 1359 ; /* nothing */ 1360 1361 /* 1362 * Count dynamic rules. This is easier as they have 1363 * fixed size. 1364 */ 1365 r = (void *)r + RULESIZE(r); 1366 dynrules = (ipfw_dyn_rule *)r ; 1367 n = (void *)r - data; 1368 ndyn = (nbytes - n) / sizeof *dynrules; 1369 1370 /* if no rule numbers were specified, list all rules */ 1371 if (ac == 0) { 1372 for (n = 0, r = data; n < nstat; 1373 n++, r = (void *)r + RULESIZE(r) ) 1374 show_ipfw(r); 1375 1376 if (do_dynamic && ndyn) { 1377 printf("## Dynamic rules (%d):\n", ndyn); 1378 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1379 show_dyn_ipfw(d); 1380 } 1381 goto done; 1382 } 1383 1384 /* display specific rules requested on command line */ 1385 1386 for (lac = ac, lav = av; lac != 0; lac--) { 1387 /* convert command line rule # */ 1388 rnum = strtoul(*lav++, &endptr, 10); 1389 if (*endptr) { 1390 exitval = EX_USAGE; 1391 warnx("invalid rule number: %s", *(lav - 1)); 1392 continue; 1393 } 1394 for (n = seen = 0, r = data; n < nstat; 1395 n++, r = (void *)r + RULESIZE(r) ) { 1396 if (r->rulenum > rnum) 1397 break; 1398 if (r->rulenum == rnum) { 1399 show_ipfw(r); 1400 seen = 1; 1401 } 1402 } 1403 if (!seen) { 1404 /* give precedence to other error(s) */ 1405 if (exitval == EX_OK) 1406 exitval = EX_UNAVAILABLE; 1407 warnx("rule %lu does not exist", rnum); 1408 } 1409 } 1410 1411 if (do_dynamic && ndyn) { 1412 printf("## Dynamic rules:\n"); 1413 for (lac = ac, lav = av; lac != 0; lac--) { 1414 rnum = strtoul(*lav++, &endptr, 10); 1415 if (*endptr) 1416 /* already warned */ 1417 continue; 1418 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1419 if ((int)(d->rule) > rnum) 1420 break; 1421 if ((int)(d->rule) == rnum) 1422 show_dyn_ipfw(d); 1423 } 1424 } 1425 } 1426 1427 ac = 0; 1428 1429 done: 1430 free(data); 1431 1432 if (exitval != EX_OK) 1433 exit(exitval); 1434 } 1435 1436 static void 1437 show_usage(void) 1438 { 1439 fprintf(stderr, "usage: ipfw [options]\n" 1440 " add [number] rule\n" 1441 " pipe number config [pipeconfig]\n" 1442 " queue number config [queueconfig]\n" 1443 " [pipe] flush\n" 1444 " [pipe] delete number ...\n" 1445 " [pipe] {list|show} [number ...]\n" 1446 " {zero|resetlog} [number ...]\n" 1447 "do \"ipfw -h\" or see ipfw manpage for details\n" 1448 ); 1449 1450 exit(EX_USAGE); 1451 } 1452 1453 static void 1454 help(void) 1455 { 1456 1457 fprintf(stderr, "ipfw syntax summary:\n" 1458 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n" 1459 "ipfw {pipe|queue} N config BODY\n" 1460 "ipfw [pipe] {zero|delete|show} [N{,N}]\n" 1461 "\n" 1462 "RULE: [1..] [PROB] BODY\n" 1463 "RULENUM: INTEGER(1..65534)\n" 1464 "PROB: prob REAL(0..1)\n" 1465 "BODY: check-state [LOG] (no body) |\n" 1466 " ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n" 1467 "ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1468 " {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1469 "ADDR: [ MAC dst src ether_type ] \n" 1470 " [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n" 1471 "IPLIST: IPADDR | ( IPADDR or ... or IPADDR )\n" 1472 "IPADDR: [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n" 1473 "OPTION_LIST: OPTION [,OPTION_LIST]\n" 1474 ); 1475 exit(0); 1476 } 1477 1478 1479 static int 1480 lookup_host (char *host, struct in_addr *ipaddr) 1481 { 1482 struct hostent *he; 1483 1484 if (!inet_aton(host, ipaddr)) { 1485 if ((he = gethostbyname(host)) == NULL) 1486 return(-1); 1487 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1488 } 1489 return(0); 1490 } 1491 1492 /* 1493 * fills the addr and mask fields in the instruction as appropriate from av. 1494 * Update length as appropriate. 1495 * The following formats are allowed: 1496 * any matches any IP. Actually returns an empty instruction. 1497 * me returns O_IP_*_ME 1498 * 1.2.3.4 single IP address 1499 * 1.2.3.4:5.6.7.8 address:mask 1500 * 1.2.3.4/24 address/mask 1501 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1502 */ 1503 static void 1504 fill_ip(ipfw_insn_ip *cmd, char *av) 1505 { 1506 char *p = 0, md = 0; 1507 u_int32_t i; 1508 1509 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1510 1511 if (!strncmp(av, "any", strlen(av))) 1512 return; 1513 1514 if (!strncmp(av, "me", strlen(av))) { 1515 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1516 return; 1517 } 1518 1519 p = strchr(av, '/'); 1520 if (!p) 1521 p = strchr(av, ':'); 1522 if (p) { 1523 md = *p; 1524 *p++ = '\0'; 1525 } 1526 1527 if (lookup_host(av, &cmd->addr) != 0) 1528 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1529 switch (md) { 1530 case ':': 1531 if (!inet_aton(p, &cmd->mask)) 1532 errx(EX_DATAERR, "bad netmask ``%s''", p); 1533 break; 1534 case '/': 1535 i = atoi(p); 1536 if (i == 0) 1537 cmd->mask.s_addr = htonl(0); 1538 else if (i > 32) 1539 errx(EX_DATAERR, "bad width ``%s''", p); 1540 else 1541 cmd->mask.s_addr = htonl(~0 << (32 - i)); 1542 break; 1543 default: 1544 cmd->mask.s_addr = htonl(~0); 1545 break; 1546 } 1547 cmd->addr.s_addr &= cmd->mask.s_addr; 1548 /* 1549 * now look if we have a set of addresses. They are stored as follows: 1550 * arg1 is the set size (powers of 2, 2..256) 1551 * addr is the base address IN HOST FORMAT 1552 * mask.. is an array of u_int32_t with bits set. 1553 */ 1554 if (p) 1555 p = strchr(p, '{'); 1556 if (p) { /* fetch addresses */ 1557 u_int32_t *d; 1558 int low, high; 1559 int i = contigmask((u_char *)&(cmd->mask), 32); 1560 1561 if (i < 24 || i > 31) { 1562 fprintf(stderr, "invalid set with mask %d\n", 1563 i); 1564 exit(0); 1565 } 1566 cmd->o.arg1 = 1<<(32-i); 1567 cmd->addr.s_addr = ntohl(cmd->addr.s_addr); 1568 d = (u_int32_t *)&cmd->mask; 1569 cmd->o.opcode = O_IP_DST_SET; /* default */ 1570 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 1571 fprintf(stderr,"-- set size %d cmdlen %d\n", 1572 cmd->o.arg1, cmd->o.len ); 1573 for (i = 0; i < cmd->o.arg1/32 ; i++) 1574 d[i] = 0; /* clear masks */ 1575 1576 av = p+1; 1577 low = cmd->addr.s_addr & 0xff; 1578 high = low + cmd->o.arg1 - 1; 1579 while (isdigit(*av)) { 1580 char *s; 1581 u_int16_t a = strtol(av, &s, 0); 1582 1583 if (s == av) /* no parameter */ 1584 break; 1585 if (a < low || a > high) { 1586 fprintf(stderr, "addr %d out of range [%d-%d]\n", 1587 a, low, high); 1588 exit(0); 1589 } 1590 a -= low; 1591 d[ a/32] |= 1<<(a & 31); 1592 if (*s != ',') 1593 break; 1594 av = s+1; 1595 } 1596 return; 1597 } 1598 1599 if (cmd->mask.s_addr == 0) { /* any */ 1600 if (cmd->o.len & F_NOT) 1601 errx(EX_DATAERR, "not any never matches"); 1602 else /* useless, nuke it */ 1603 return; 1604 } else if (cmd->mask.s_addr == IP_MASK_ALL) /* one IP */ 1605 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1606 else /* addr/mask */ 1607 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip); 1608 } 1609 1610 1611 /* 1612 * helper function to process a set of flags and set bits in the 1613 * appropriate masks. 1614 */ 1615 static void 1616 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 1617 struct _s_x *flags, char *p) 1618 { 1619 u_int8_t set=0, clear=0; 1620 1621 while (p && *p) { 1622 char *q; /* points to the separator */ 1623 int val; 1624 u_int8_t *which; /* mask we are working on */ 1625 1626 if (*p == '!') { 1627 p++; 1628 which = &clear; 1629 } else 1630 which = &set; 1631 q = strchr(p, ','); 1632 if (q) 1633 *q++ = '\0'; 1634 val = match_token(flags, p); 1635 if (val <= 0) 1636 errx(EX_DATAERR, "invalid flag %s", p); 1637 *which |= (u_int8_t)val; 1638 p = q; 1639 } 1640 cmd->opcode = opcode; 1641 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 1642 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 1643 } 1644 1645 1646 static void 1647 delete(int ac, char *av[]) 1648 { 1649 int rulenum; 1650 struct dn_pipe pipe; 1651 int i; 1652 int exitval = EX_OK; 1653 1654 memset(&pipe, 0, sizeof pipe); 1655 1656 av++; ac--; 1657 1658 /* Rule number */ 1659 while (ac && isdigit(**av)) { 1660 i = atoi(*av); av++; ac--; 1661 if (do_pipe) { 1662 if (do_pipe == 1) 1663 pipe.pipe_nr = i; 1664 else 1665 pipe.fs.fs_nr = i; 1666 i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL, 1667 &pipe, sizeof pipe); 1668 if (i) { 1669 exitval = 1; 1670 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 1671 do_pipe == 1 ? pipe.pipe_nr : 1672 pipe.fs.fs_nr); 1673 } 1674 } else { 1675 rulenum = i; 1676 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum, 1677 sizeof rulenum); 1678 if (i) { 1679 exitval = EX_UNAVAILABLE; 1680 warn("rule %u: setsockopt(IP_FW_DEL)", 1681 rulenum); 1682 } 1683 } 1684 } 1685 if (exitval != EX_OK) 1686 exit(exitval); 1687 } 1688 1689 1690 /* 1691 * fill the interface structure. We do not check the name as we can 1692 * create interfaces dynamically, so checking them at insert time 1693 * makes relatively little sense. 1694 * A '*' following the name means any unit. 1695 */ 1696 static void 1697 fill_iface(ipfw_insn_if *cmd, char *arg) 1698 { 1699 cmd->name[0] = '\0'; 1700 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 1701 1702 /* Parse the interface or address */ 1703 if (!strcmp(arg, "any")) 1704 cmd->o.len = 0; /* effectively ignore this command */ 1705 else if (!isdigit(*arg)) { 1706 char *q; 1707 1708 strncpy(cmd->name, arg, sizeof(cmd->name)); 1709 cmd->name[sizeof(cmd->name) - 1] = '\0'; 1710 /* find first digit or wildcard */ 1711 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++) 1712 continue; 1713 cmd->p.unit = (*q == '*') ? -1 : atoi(q); 1714 *q = '\0'; 1715 } else if (!inet_aton(arg, &cmd->p.ip)) 1716 errx(EX_DATAERR, "bad ip address ``%s''", arg); 1717 } 1718 1719 /* 1720 * the following macro returns an error message if we run out of 1721 * arguments. 1722 */ 1723 #define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 1724 1725 static void 1726 config_pipe(int ac, char **av) 1727 { 1728 struct dn_pipe pipe; 1729 int i; 1730 char *end; 1731 u_int32_t a; 1732 void *par = NULL; 1733 1734 memset(&pipe, 0, sizeof pipe); 1735 1736 av++; ac--; 1737 /* Pipe number */ 1738 if (ac && isdigit(**av)) { 1739 i = atoi(*av); av++; ac--; 1740 if (do_pipe == 1) 1741 pipe.pipe_nr = i; 1742 else 1743 pipe.fs.fs_nr = i; 1744 } 1745 while (ac > 0) { 1746 double d; 1747 int tok = match_token(dummynet_params, *av); 1748 ac--; av++; 1749 1750 switch(tok) { 1751 case TOK_PLR: 1752 NEED1("plr needs argument 0..1\n"); 1753 d = strtod(av[0], NULL); 1754 if (d > 1) 1755 d = 1; 1756 else if (d < 0) 1757 d = 0; 1758 pipe.fs.plr = (int)(d*0x7fffffff); 1759 ac--; av++; 1760 break; 1761 1762 case TOK_QUEUE: 1763 NEED1("queue needs queue size\n"); 1764 end = NULL; 1765 pipe.fs.qsize = strtoul(av[0], &end, 0); 1766 if (*end == 'K' || *end == 'k') { 1767 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES; 1768 pipe.fs.qsize *= 1024; 1769 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 1770 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES; 1771 } 1772 ac--; av++; 1773 break; 1774 1775 case TOK_BUCKETS: 1776 NEED1("buckets needs argument\n"); 1777 pipe.fs.rq_size = strtoul(av[0], NULL, 0); 1778 ac--; av++; 1779 break; 1780 1781 case TOK_MASK: 1782 NEED1("mask needs mask specifier\n"); 1783 /* 1784 * per-flow queue, mask is dst_ip, dst_port, 1785 * src_ip, src_port, proto measured in bits 1786 */ 1787 par = NULL; 1788 1789 pipe.fs.flow_mask.dst_ip = 0; 1790 pipe.fs.flow_mask.src_ip = 0; 1791 pipe.fs.flow_mask.dst_port = 0; 1792 pipe.fs.flow_mask.src_port = 0; 1793 pipe.fs.flow_mask.proto = 0; 1794 end = NULL; 1795 1796 while (ac >= 1) { 1797 u_int32_t *p32 = NULL; 1798 u_int16_t *p16 = NULL; 1799 1800 tok = match_token(dummynet_params, *av); 1801 ac--; av++; 1802 switch(tok) { 1803 case TOK_ALL: 1804 /* 1805 * special case, all bits significant 1806 */ 1807 pipe.fs.flow_mask.dst_ip = ~0; 1808 pipe.fs.flow_mask.src_ip = ~0; 1809 pipe.fs.flow_mask.dst_port = ~0; 1810 pipe.fs.flow_mask.src_port = ~0; 1811 pipe.fs.flow_mask.proto = ~0; 1812 pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK; 1813 goto end_mask; 1814 1815 case TOK_DSTIP: 1816 p32 = &pipe.fs.flow_mask.dst_ip; 1817 break; 1818 1819 case TOK_SRCIP: 1820 p32 = &pipe.fs.flow_mask.src_ip; 1821 break; 1822 1823 case TOK_DSTPORT: 1824 p16 = &pipe.fs.flow_mask.dst_port; 1825 break; 1826 1827 case TOK_SRCPORT: 1828 p16 = &pipe.fs.flow_mask.src_port; 1829 break; 1830 1831 case TOK_PROTO: 1832 break; 1833 1834 default: 1835 ac++; av--; /* backtrack */ 1836 goto end_mask; 1837 } 1838 if (ac < 1) 1839 errx(EX_USAGE, "mask: value missing"); 1840 if (*av[0] == '/') { 1841 a = strtoul(av[0]+1, &end, 0); 1842 a = (a == 32) ? ~0 : (1 << a) - 1; 1843 } else 1844 a = strtoul(av[1], &end, 0); 1845 if (p32 != NULL) 1846 *p32 = a; 1847 else if (p16 != NULL) { 1848 if (a > 65535) 1849 errx(EX_DATAERR, 1850 "mask: must be 16 bit"); 1851 *p16 = (u_int16_t)a; 1852 } else { 1853 if (a > 255) 1854 errx(EX_DATAERR, 1855 "mask: must be 8 bit"); 1856 pipe.fs.flow_mask.proto = (u_int8_t)a; 1857 } 1858 if (a != 0) 1859 pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK; 1860 ac--; av++; 1861 } /* end while, config masks */ 1862 end_mask: 1863 break; 1864 1865 case TOK_RED: 1866 case TOK_GRED: 1867 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 1868 pipe.fs.flags_fs |= DN_IS_RED; 1869 if (tok == TOK_GRED) 1870 pipe.fs.flags_fs |= DN_IS_GENTLE_RED; 1871 /* 1872 * the format for parameters is w_q/min_th/max_th/max_p 1873 */ 1874 if ((end = strsep(&av[0], "/"))) { 1875 double w_q = strtod(end, NULL); 1876 if (w_q > 1 || w_q <= 0) 1877 errx(EX_DATAERR, "0 < w_q <= 1"); 1878 pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 1879 } 1880 if ((end = strsep(&av[0], "/"))) { 1881 pipe.fs.min_th = strtoul(end, &end, 0); 1882 if (*end == 'K' || *end == 'k') 1883 pipe.fs.min_th *= 1024; 1884 } 1885 if ((end = strsep(&av[0], "/"))) { 1886 pipe.fs.max_th = strtoul(end, &end, 0); 1887 if (*end == 'K' || *end == 'k') 1888 pipe.fs.max_th *= 1024; 1889 } 1890 if ((end = strsep(&av[0], "/"))) { 1891 double max_p = strtod(end, NULL); 1892 if (max_p > 1 || max_p <= 0) 1893 errx(EX_DATAERR, "0 < max_p <= 1"); 1894 pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 1895 } 1896 ac--; av++; 1897 break; 1898 1899 case TOK_DROPTAIL: 1900 pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 1901 break; 1902 1903 case TOK_BW: 1904 NEED1("bw needs bandwidth or interface\n"); 1905 if (do_pipe != 1) 1906 errx(EX_DATAERR, "bandwidth only valid for pipes"); 1907 /* 1908 * set clocking interface or bandwidth value 1909 */ 1910 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 1911 int l = sizeof(pipe.if_name)-1; 1912 /* interface name */ 1913 strncpy(pipe.if_name, av[0], l); 1914 pipe.if_name[l] = '\0'; 1915 pipe.bandwidth = 0; 1916 } else { 1917 pipe.if_name[0] = '\0'; 1918 pipe.bandwidth = strtoul(av[0], &end, 0); 1919 if (*end == 'K' || *end == 'k') { 1920 end++; 1921 pipe.bandwidth *= 1000; 1922 } else if (*end == 'M') { 1923 end++; 1924 pipe.bandwidth *= 1000000; 1925 } 1926 if (*end == 'B' || !strncmp(end, "by", 2)) 1927 pipe.bandwidth *= 8; 1928 if (pipe.bandwidth < 0) 1929 errx(EX_DATAERR, "bandwidth too large"); 1930 } 1931 ac--; av++; 1932 break; 1933 1934 case TOK_DELAY: 1935 if (do_pipe != 1) 1936 errx(EX_DATAERR, "delay only valid for pipes"); 1937 NEED1("delay needs argument 0..10000ms\n"); 1938 pipe.delay = strtoul(av[0], NULL, 0); 1939 ac--; av++; 1940 break; 1941 1942 case TOK_WEIGHT: 1943 if (do_pipe == 1) 1944 errx(EX_DATAERR,"weight only valid for queues"); 1945 NEED1("weight needs argument 0..100\n"); 1946 pipe.fs.weight = strtoul(av[0], &end, 0); 1947 ac--; av++; 1948 break; 1949 1950 case TOK_PIPE: 1951 if (do_pipe == 1) 1952 errx(EX_DATAERR,"pipe only valid for queues"); 1953 NEED1("pipe needs pipe_number\n"); 1954 pipe.fs.parent_nr = strtoul(av[0], &end, 0); 1955 ac--; av++; 1956 break; 1957 1958 default: 1959 errx(EX_DATAERR, "unrecognised option ``%s''", *av); 1960 } 1961 } 1962 if (do_pipe == 1) { 1963 if (pipe.pipe_nr == 0) 1964 errx(EX_DATAERR, "pipe_nr must be > 0"); 1965 if (pipe.delay > 10000) 1966 errx(EX_DATAERR, "delay must be < 10000"); 1967 } else { /* do_pipe == 2, queue */ 1968 if (pipe.fs.parent_nr == 0) 1969 errx(EX_DATAERR, "pipe must be > 0"); 1970 if (pipe.fs.weight >100) 1971 errx(EX_DATAERR, "weight must be <= 100"); 1972 } 1973 if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) { 1974 if (pipe.fs.qsize > 1024*1024) 1975 errx(EX_DATAERR, "queue size must be < 1MB"); 1976 } else { 1977 if (pipe.fs.qsize > 100) 1978 errx(EX_DATAERR, "2 <= queue size <= 100"); 1979 } 1980 if (pipe.fs.flags_fs & DN_IS_RED) { 1981 size_t len; 1982 int lookup_depth, avg_pkt_size; 1983 double s, idle, weight, w_q; 1984 struct clockinfo clock; 1985 int t; 1986 1987 if (pipe.fs.min_th >= pipe.fs.max_th) 1988 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 1989 pipe.fs.min_th, pipe.fs.max_th); 1990 if (pipe.fs.max_th == 0) 1991 errx(EX_DATAERR, "max_th must be > 0"); 1992 1993 len = sizeof(int); 1994 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 1995 &lookup_depth, &len, NULL, 0) == -1) 1996 1997 errx(1, "sysctlbyname(\"%s\")", 1998 "net.inet.ip.dummynet.red_lookup_depth"); 1999 if (lookup_depth == 0) 2000 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2001 " must be greater than zero"); 2002 2003 len = sizeof(int); 2004 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2005 &avg_pkt_size, &len, NULL, 0) == -1) 2006 2007 errx(1, "sysctlbyname(\"%s\")", 2008 "net.inet.ip.dummynet.red_avg_pkt_size"); 2009 if (avg_pkt_size == 0) 2010 errx(EX_DATAERR, 2011 "net.inet.ip.dummynet.red_avg_pkt_size must" 2012 " be greater than zero"); 2013 2014 len = sizeof(struct clockinfo); 2015 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1) 2016 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2017 2018 /* 2019 * Ticks needed for sending a medium-sized packet. 2020 * Unfortunately, when we are configuring a WF2Q+ queue, we 2021 * do not have bandwidth information, because that is stored 2022 * in the parent pipe, and also we have multiple queues 2023 * competing for it. So we set s=0, which is not very 2024 * correct. But on the other hand, why do we want RED with 2025 * WF2Q+ ? 2026 */ 2027 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */ 2028 s = 0; 2029 else 2030 s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth; 2031 2032 /* 2033 * max idle time (in ticks) before avg queue size becomes 0. 2034 * NOTA: (3/w_q) is approx the value x so that 2035 * (1-w_q)^x < 10^-3. 2036 */ 2037 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED); 2038 idle = s * 3. / w_q; 2039 pipe.fs.lookup_step = (int)idle / lookup_depth; 2040 if (!pipe.fs.lookup_step) 2041 pipe.fs.lookup_step = 1; 2042 weight = 1 - w_q; 2043 for (t = pipe.fs.lookup_step; t > 0; --t) 2044 weight *= weight; 2045 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2046 } 2047 i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe, 2048 sizeof pipe); 2049 if (i) 2050 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2051 } 2052 2053 static void 2054 get_mac_addr_mask(char *p, u_char *addr, u_char *mask) 2055 { 2056 int i, l; 2057 2058 for (i=0; i<6; i++) 2059 addr[i] = mask[i] = 0; 2060 if (!strcmp(p, "any")) 2061 return; 2062 2063 for (i=0; *p && i<6;i++, p++) { 2064 addr[i] = strtol(p, &p, 16); 2065 if (*p != ':') /* we start with the mask */ 2066 break; 2067 } 2068 if (*p == '/') { /* mask len */ 2069 l = strtol(p+1, &p, 0); 2070 for (i=0; l>0; l -=8, i++) 2071 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2072 } else if (*p == '&') { /* mask */ 2073 for (i=0, p++; *p && i<6;i++, p++) { 2074 mask[i] = strtol(p, &p, 16); 2075 if (*p != ':') 2076 break; 2077 } 2078 } else if (*p == '\0') { 2079 for (i=0; i<6; i++) 2080 mask[i] = 0xff; 2081 } 2082 for (i=0; i<6; i++) 2083 addr[i] &= mask[i]; 2084 } 2085 2086 /* 2087 * helper function, updates the pointer to cmd with the length 2088 * of the current command, and also cleans up the first word of 2089 * the new command in case it has been clobbered before. 2090 */ 2091 static ipfw_insn * 2092 next_cmd(ipfw_insn *cmd) 2093 { 2094 cmd += F_LEN(cmd); 2095 bzero(cmd, sizeof(*cmd)); 2096 return cmd; 2097 } 2098 2099 /* 2100 * A function to fill simple commands of size 1. 2101 * Existing flags are preserved. 2102 */ 2103 static void 2104 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg) 2105 { 2106 cmd->opcode = opcode; 2107 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2108 cmd->arg1 = arg; 2109 } 2110 2111 /* 2112 * Fetch and add the MAC address and type, with masks. This generates one or 2113 * two microinstructions, and returns the pointer to the last one. 2114 */ 2115 static ipfw_insn * 2116 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2117 { 2118 ipfw_insn_mac *mac; /* also *src */ 2119 2120 if (ac <3) 2121 errx(EX_DATAERR, "MAC dst src type"); 2122 2123 cmd->opcode = O_MACADDR2; 2124 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2125 2126 mac = (ipfw_insn_mac *)cmd; 2127 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2128 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2129 av += 2; 2130 2131 if (strcmp(av[0], "any") != 0) { /* we have a non-null port */ 2132 cmd += F_LEN(cmd); 2133 2134 fill_newports((ipfw_insn_u16 *)cmd, av[0], IPPROTO_ETHERTYPE); 2135 cmd->opcode = O_MAC_TYPE; 2136 } 2137 2138 return cmd; 2139 } 2140 2141 /* 2142 * Parse arguments and assemble the microinstructions which make up a rule. 2143 * Rules are added into the 'rulebuf' and then copied in the correct order 2144 * into the actual rule. 2145 * 2146 * The syntax for a rule starts with the action, followed by an 2147 * optional log action, and the various match patterns. 2148 * In the assembled microcode, the first opcode must be a O_PROBE_STATE 2149 * (generated if the rule includes a keep-state option), then the 2150 * various match patterns, the "log" action, and the actual action. 2151 * 2152 */ 2153 static void 2154 add(int ac, char *av[]) 2155 { 2156 /* 2157 * rules are added into the 'rulebuf' and then copied in 2158 * the correct order into the actual rule. 2159 * Some things that need to go out of order (prob, action etc.) 2160 * go into actbuf[]. 2161 */ 2162 static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2163 2164 ipfw_insn *src, *dst, *cmd, *action, *prev; 2165 2166 struct ip_fw *rule; 2167 2168 /* 2169 * various flags used to record that we entered some fields. 2170 */ 2171 int have_mac = 0; /* set if we have a MAC address */ 2172 int have_state = 0; /* check-state or keep-state */ 2173 2174 int i; 2175 2176 int open_par = 0; /* open parenthesis ( */ 2177 2178 /* proto is here because it is used to fetch ports */ 2179 u_char proto = IPPROTO_IP; /* default protocol */ 2180 2181 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2182 bzero(cmdbuf, sizeof(cmdbuf)); 2183 bzero(rulebuf, sizeof(rulebuf)); 2184 2185 rule = (struct ip_fw *)rulebuf; 2186 cmd = (ipfw_insn *)cmdbuf; 2187 action = (ipfw_insn *)actbuf; 2188 2189 av++; ac--; 2190 2191 /* [rule N] -- Rule number optional */ 2192 if (ac && isdigit(**av)) { 2193 rule->rulenum = atoi(*av); 2194 av++; 2195 ac--; 2196 } 2197 2198 /* [prob D] -- match probability, optional */ 2199 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2200 double d = strtod(av[1], NULL); 2201 2202 if (d <= 0 || d > 1) 2203 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2204 if (d != 1) { /* 1 means always match */ 2205 action->opcode = O_PROB; 2206 action->len = 2; 2207 *((int32_t *)(action+1)) = 2208 (int32_t)((1 - d) * 0x7fffffff); 2209 action += action->len; 2210 } 2211 av += 2; ac -= 2; 2212 } 2213 2214 /* action -- mandatory */ 2215 NEED1("missing action"); 2216 i = match_token(rule_actions, *av); 2217 ac--; av++; 2218 action->len = 1; /* default */ 2219 switch(i) { 2220 case TOK_CHECKSTATE: 2221 have_state = 1; 2222 action->opcode = O_CHECK_STATE; 2223 break; 2224 2225 case TOK_ACCEPT: 2226 action->opcode = O_ACCEPT; 2227 break; 2228 2229 case TOK_DENY: 2230 action->opcode = O_DENY; 2231 action->arg1 = 0; 2232 break; 2233 2234 case TOK_REJECT: 2235 action->opcode = O_REJECT; 2236 action->arg1 = ICMP_UNREACH_HOST; 2237 break; 2238 2239 case TOK_RESET: 2240 action->opcode = O_REJECT; 2241 action->arg1 = ICMP_REJECT_RST; 2242 break; 2243 2244 case TOK_UNREACH: 2245 action->opcode = O_REJECT; 2246 NEED1("missing reject code"); 2247 fill_reject_code(&action->arg1, *av); 2248 ac--; av++; 2249 break; 2250 2251 case TOK_COUNT: 2252 action->opcode = O_COUNT; 2253 break; 2254 2255 case TOK_QUEUE: 2256 case TOK_PIPE: 2257 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2258 case TOK_SKIPTO: 2259 if (i == TOK_QUEUE) 2260 action->opcode = O_QUEUE; 2261 else if (i == TOK_PIPE) 2262 action->opcode = O_PIPE; 2263 else if (i == TOK_SKIPTO) 2264 action->opcode = O_SKIPTO; 2265 NEED1("missing skipto/pipe/queue number"); 2266 action->arg1 = strtoul(*av, NULL, 10); 2267 av++; ac--; 2268 break; 2269 2270 case TOK_DIVERT: 2271 case TOK_TEE: 2272 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2273 NEED1("missing divert/tee port"); 2274 action->arg1 = strtoul(*av, NULL, 0); 2275 if (action->arg1 == 0) { 2276 struct servent *s; 2277 setservent(1); 2278 s = getservbyname(av[0], "divert"); 2279 if (s != NULL) 2280 action->arg1 = ntohs(s->s_port); 2281 else 2282 errx(EX_DATAERR, "illegal divert/tee port"); 2283 } 2284 ac--; av++; 2285 break; 2286 2287 case TOK_FORWARD: { 2288 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2289 char *s, *end; 2290 2291 NEED1("missing forward address[:port]"); 2292 2293 action->opcode = O_FORWARD_IP; 2294 action->len = F_INSN_SIZE(ipfw_insn_sa); 2295 2296 p->sa.sin_len = sizeof(struct sockaddr_in); 2297 p->sa.sin_family = AF_INET; 2298 p->sa.sin_port = 0; 2299 /* 2300 * locate the address-port separator (':' or ',') 2301 */ 2302 s = strchr(*av, ':'); 2303 if (s == NULL) 2304 s = strchr(*av, ','); 2305 if (s != NULL) { 2306 *(s++) = '\0'; 2307 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2308 if (s == end) 2309 errx(EX_DATAERR, 2310 "illegal forwarding port ``%s''", s); 2311 p->sa.sin_port = htons( (u_short)i ); 2312 } 2313 lookup_host(*av, &(p->sa.sin_addr)); 2314 } 2315 ac--; av++; 2316 break; 2317 2318 default: 2319 errx(EX_DATAERR, "invalid action %s\n", *av); 2320 } 2321 action = next_cmd(action); 2322 2323 /* 2324 * [log [logamount N]] -- log, optional 2325 * 2326 * If exists, it goes first in the cmdbuf, but then it is 2327 * skipped in the copy section to the end of the buffer. 2328 */ 2329 if (ac && !strncmp(*av, "log", strlen(*av))) { 2330 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2331 2332 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2333 cmd->opcode = O_LOG; 2334 av++; ac--; 2335 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2336 ac--; av++; 2337 NEED1("logamount requires argument"); 2338 c->max_log = atoi(*av); 2339 if (c->max_log < 0) 2340 errx(EX_DATAERR, "logamount must be positive"); 2341 ac--; av++; 2342 } 2343 cmd = next_cmd(cmd); 2344 } 2345 2346 if (have_state) { 2347 have_state = 0; 2348 goto done; 2349 } 2350 2351 #define OR_START(target) \ 2352 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2353 if (open_par) \ 2354 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2355 open_par = 1; \ 2356 if ( (av[0])[1] == '\0') { \ 2357 ac--; av++; \ 2358 } else \ 2359 (*av)++; \ 2360 } \ 2361 target: \ 2362 2363 2364 #define CLOSE_PAR \ 2365 if (open_par) { \ 2366 if (ac && ( \ 2367 !strncmp(*av, ")", strlen(*av)) || \ 2368 !strncmp(*av, "}", strlen(*av)) )) { \ 2369 open_par = 0; \ 2370 ac--; av++; \ 2371 } else \ 2372 errx(EX_USAGE, "missing \")\"\n"); \ 2373 } 2374 2375 #define NOT_BLOCK \ 2376 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2377 if (cmd->len & F_NOT) \ 2378 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2379 cmd->len |= F_NOT; \ 2380 ac--; av++; \ 2381 } 2382 2383 #define OR_BLOCK(target) \ 2384 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2385 if (prev == NULL || open_par == 0) \ 2386 errx(EX_DATAERR, "invalid OR block"); \ 2387 prev->len |= F_OR; \ 2388 ac--; av++; \ 2389 goto target; \ 2390 } \ 2391 CLOSE_PAR; 2392 2393 /* 2394 * protocol, mandatory 2395 */ 2396 OR_START(get_proto); 2397 NOT_BLOCK; 2398 NEED1("missing protocol"); 2399 { 2400 struct protoent *pe; 2401 2402 if (!strncmp(*av, "all", strlen(*av))) 2403 ; /* same as "ip" */ 2404 else if (!strncmp(*av, "MAC", strlen(*av))) { 2405 /* need exactly 3 fields */ 2406 cmd = add_mac(cmd, ac-1, av+1); /* exits in case of errors */ 2407 ac -= 3; 2408 av += 3; 2409 have_mac = 1; 2410 } else if ((proto = atoi(*av)) > 0) 2411 ; /* all done! */ 2412 else if ((pe = getprotobyname(*av)) != NULL) 2413 proto = pe->p_proto; 2414 else 2415 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 2416 av++; ac--; 2417 if (proto != IPPROTO_IP) 2418 fill_cmd(cmd, O_PROTO, 0, proto); 2419 } 2420 cmd = next_cmd(cmd); 2421 OR_BLOCK(get_proto); 2422 2423 /* 2424 * "from", mandatory (unless we have a MAC address) 2425 */ 2426 if (!ac || strncmp(*av, "from", strlen(*av))) { 2427 if (have_mac) /* we do not need a "to" address */ 2428 goto read_to; 2429 errx(EX_USAGE, "missing ``from''"); 2430 } 2431 ac--; av++; 2432 2433 /* 2434 * source IP, mandatory 2435 */ 2436 OR_START(source_ip); 2437 NOT_BLOCK; /* optional "not" */ 2438 NEED1("missing source address"); 2439 2440 /* source -- mandatory */ 2441 fill_ip((ipfw_insn_ip *)cmd, *av); 2442 if (cmd->opcode == O_IP_DST_SET) /* set */ 2443 cmd->opcode = O_IP_SRC_SET; 2444 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2445 cmd->opcode = O_IP_SRC_ME; 2446 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2447 cmd->opcode = O_IP_SRC; 2448 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */ 2449 cmd->opcode = O_IP_SRC_MASK; 2450 /* otherwise len will be zero and the command skipped */ 2451 ac--; av++; 2452 prev = cmd; /* in case we need to backtrack */ 2453 cmd = next_cmd(cmd); 2454 OR_BLOCK(source_ip); 2455 2456 /* 2457 * source ports, optional 2458 */ 2459 NOT_BLOCK; /* optional "not" */ 2460 if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) { 2461 /* XXX todo: check that we have a protocol with ports */ 2462 cmd->opcode = O_IP_SRCPORT; 2463 ac--; 2464 av++; 2465 cmd = next_cmd(cmd); 2466 } 2467 2468 read_to: 2469 /* 2470 * "to", mandatory (unless we have a MAC address 2471 */ 2472 if (!ac || strncmp(*av, "to", strlen(*av))) { 2473 if (have_mac) 2474 goto read_options; 2475 errx(EX_USAGE, "missing ``to''"); 2476 } 2477 av++; ac--; 2478 2479 /* 2480 * destination, mandatory 2481 */ 2482 OR_START(dest_ip); 2483 NOT_BLOCK; /* optional "not" */ 2484 NEED1("missing dst address"); 2485 fill_ip((ipfw_insn_ip *)cmd, *av); 2486 if (cmd->opcode == O_IP_DST_SET) /* set */ 2487 ; 2488 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2489 cmd->opcode = O_IP_DST_ME; 2490 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2491 cmd->opcode = O_IP_DST; 2492 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */ 2493 cmd->opcode = O_IP_DST_MASK; 2494 ac--; 2495 av++; 2496 prev = cmd; 2497 cmd = next_cmd(cmd); 2498 OR_BLOCK(dest_ip); 2499 2500 /* 2501 * dest. ports, optional 2502 */ 2503 NOT_BLOCK; /* optional "not" */ 2504 if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) { 2505 /* XXX todo: check that we have a protocol with ports */ 2506 cmd->opcode = O_IP_DSTPORT; 2507 ac--; 2508 av++; 2509 cmd += F_LEN(cmd); 2510 } 2511 2512 read_options: 2513 prev = NULL; 2514 while (ac) { 2515 char *s = *av; 2516 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; /* alias */ 2517 2518 if (*s == '!') { /* alternate syntax for NOT */ 2519 if (cmd->len & F_NOT) 2520 errx(EX_USAGE, "double \"not\" not allowed\n"); 2521 cmd->len = F_NOT; 2522 s++; 2523 } 2524 i = match_token(rule_options, s); 2525 ac--; av++; 2526 switch(i) { 2527 case TOK_NOT: 2528 if (cmd->len & F_NOT) 2529 errx(EX_USAGE, "double \"not\" not allowed\n"); 2530 cmd->len = F_NOT; 2531 break; 2532 2533 case TOK_OR: 2534 if (prev == NULL) 2535 errx(EX_USAGE, "invalid \"or\" block\n"); 2536 prev->len |= F_OR; 2537 break; 2538 2539 case TOK_IN: 2540 fill_cmd(cmd, O_IN, 0, 0); 2541 break; 2542 2543 case TOK_OUT: 2544 cmd->len ^= F_NOT; /* toggle F_NOT */ 2545 fill_cmd(cmd, O_IN, 0, 0); 2546 break; 2547 2548 case TOK_FRAG: 2549 fill_cmd(cmd, O_FRAG, 0, 0); 2550 break; 2551 2552 case TOK_LAYER2: 2553 fill_cmd(cmd, O_LAYER2, 0, 0); 2554 break; 2555 2556 case TOK_XMIT: 2557 case TOK_RECV: 2558 case TOK_VIA: 2559 NEED1("recv, xmit, via require interface name" 2560 " or address"); 2561 fill_iface((ipfw_insn_if *)cmd, av[0]); 2562 ac--; av++; 2563 if (F_LEN(cmd) == 0) /* not a valid address */ 2564 break; 2565 if (i == TOK_XMIT) 2566 cmd->opcode = O_XMIT; 2567 else if (i == TOK_RECV) 2568 cmd->opcode = O_RECV; 2569 else if (i == TOK_VIA) 2570 cmd->opcode = O_VIA; 2571 break; 2572 2573 case TOK_ICMPTYPES: 2574 NEED1("icmptypes requires list of types"); 2575 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 2576 av++; ac--; 2577 break; 2578 2579 case TOK_IPTTL: 2580 NEED1("ipttl requires TTL"); 2581 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 2582 ac--; av++; 2583 break; 2584 2585 case TOK_IPID: 2586 NEED1("ipid requires length"); 2587 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 2588 ac--; av++; 2589 break; 2590 2591 case TOK_IPLEN: 2592 NEED1("iplen requires length"); 2593 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 2594 ac--; av++; 2595 break; 2596 2597 case TOK_IPVER: 2598 NEED1("ipver requires version"); 2599 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 2600 ac--; av++; 2601 break; 2602 2603 case TOK_IPPRECEDENCE: 2604 NEED1("ipprecedence requires value"); 2605 fill_cmd(cmd, O_IPPRECEDENCE, 0, 2606 (strtoul(*av, NULL, 0) & 7) << 5); 2607 ac--; av++; 2608 break; 2609 2610 case TOK_IPOPTS: 2611 NEED1("missing argument for ipoptions"); 2612 fill_flags(cmd, O_IPOPTS, f_ipopts, *av); 2613 ac--; av++; 2614 break; 2615 2616 case TOK_IPTOS: 2617 NEED1("missing argument for iptos"); 2618 fill_flags(cmd, O_IPOPTS, f_iptos, *av); 2619 ac--; av++; 2620 break; 2621 2622 case TOK_UID: 2623 NEED1("uid requires argument"); 2624 { 2625 char *end; 2626 uid_t uid; 2627 struct passwd *pwd; 2628 2629 cmd->opcode = O_UID; 2630 uid = strtoul(*av, &end, 0); 2631 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 2632 if (pwd == NULL) 2633 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 2634 cmd32->d[0] = uid; 2635 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2636 ac--; av++; 2637 } 2638 break; 2639 2640 case TOK_GID: 2641 NEED1("gid requires argument"); 2642 { 2643 char *end; 2644 gid_t gid; 2645 struct group *grp; 2646 2647 cmd->opcode = O_GID; 2648 gid = strtoul(*av, &end, 0); 2649 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 2650 if (grp == NULL) 2651 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 2652 2653 cmd32->d[0] = gid; 2654 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2655 ac--; av++; 2656 } 2657 break; 2658 2659 case TOK_ESTAB: 2660 fill_cmd(cmd, O_ESTAB, 0, 0); 2661 break; 2662 2663 case TOK_SETUP: 2664 fill_cmd(cmd, O_TCPFLAGS, 0, 2665 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 2666 break; 2667 2668 case TOK_TCPOPTS: 2669 NEED1("missing argument for tcpoptions"); 2670 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 2671 ac--; av++; 2672 break; 2673 2674 case TOK_TCPSEQ: 2675 case TOK_TCPACK: 2676 NEED1("tcpseq/tcpack requires argument"); 2677 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 2678 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 2679 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 2680 ac--; av++; 2681 break; 2682 2683 case TOK_TCPWIN: 2684 NEED1("tcpwin requires length"); 2685 fill_cmd(cmd, O_TCPWIN, 0, 2686 htons(strtoul(*av, NULL, 0))); 2687 ac--; av++; 2688 break; 2689 2690 case TOK_TCPFLAGS: 2691 NEED1("missing argument for tcpflags"); 2692 cmd->opcode = O_TCPFLAGS; 2693 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 2694 ac--; av++; 2695 break; 2696 2697 case TOK_KEEPSTATE: 2698 have_state = 1; 2699 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 2700 break; 2701 2702 case TOK_LIMIT: 2703 NEED1("limit needs mask and # of connections"); 2704 { 2705 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 2706 2707 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 2708 cmd->opcode = O_LIMIT; 2709 c->limit_mask = 0; 2710 c->conn_limit = 0; 2711 for (; ac >1 ;) { 2712 int val; 2713 2714 val = match_token(limit_masks, *av); 2715 if (val <= 0) 2716 break; 2717 c->limit_mask |= val; 2718 ac--; av++; 2719 } 2720 c->conn_limit = atoi(*av); 2721 if (c->conn_limit == 0) 2722 errx(EX_USAGE, "limit: limit must be >0"); 2723 if (c->limit_mask == 0) 2724 errx(EX_USAGE, "missing limit mask"); 2725 ac--; av++; 2726 have_state = 1; 2727 } 2728 break; 2729 2730 default: 2731 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 2732 } 2733 if (F_LEN(cmd) > 0) { /* prepare to advance */ 2734 prev = cmd; 2735 cmd = next_cmd(cmd); 2736 } 2737 } 2738 2739 done: 2740 /* 2741 * Now copy stuff into the rule. 2742 * If we have a keep-state option, the first instruction 2743 * must be a PROBE_STATE (which is generated here). 2744 * If we have a LOG option, it was stored as the first command, 2745 * and now must be moved to the top of the action part. 2746 */ 2747 dst = (ipfw_insn *)rule->cmd; 2748 2749 /* 2750 * generate O_PROBE_STATE if necessary 2751 */ 2752 if (have_state) { 2753 fill_cmd(dst, O_PROBE_STATE, 0, 0); 2754 dst = next_cmd(dst); 2755 } 2756 /* 2757 * copy all commands but O_LOG 2758 */ 2759 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 2760 i = F_LEN(src); 2761 2762 if (src->opcode != O_LOG) { 2763 bcopy(src, dst, i * sizeof(u_int32_t)); 2764 dst += i; 2765 } 2766 } 2767 2768 /* 2769 * start action section 2770 */ 2771 rule->act_ofs = dst - rule->cmd; 2772 2773 /* 2774 * put back O_LOG if necessary 2775 */ 2776 src = (ipfw_insn *)cmdbuf; 2777 if ( src->opcode == O_LOG ) { 2778 i = F_LEN(src); 2779 bcopy(src, dst, i * sizeof(u_int32_t)); 2780 dst += i; 2781 } 2782 /* 2783 * copy all other actions 2784 */ 2785 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 2786 i = F_LEN(src); 2787 bcopy(src, dst, i * sizeof(u_int32_t)); 2788 dst += i; 2789 } 2790 2791 rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd); 2792 i = (void *)dst - (void *)rule; 2793 if (!do_quiet) 2794 show_ipfw(rule); 2795 if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1) 2796 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 2797 if (!do_quiet) 2798 show_ipfw(rule); 2799 } 2800 2801 static void 2802 zero (int ac, char *av[]) 2803 { 2804 int rulenum; 2805 int failed = EX_OK; 2806 2807 av++; ac--; 2808 2809 if (!ac) { 2810 /* clear all entries */ 2811 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0) 2812 err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO"); 2813 if (!do_quiet) 2814 printf("Accounting cleared.\n"); 2815 2816 return; 2817 } 2818 2819 while (ac) { 2820 /* Rule number */ 2821 if (isdigit(**av)) { 2822 rulenum = atoi(*av); 2823 av++; 2824 ac--; 2825 if (setsockopt(s, IPPROTO_IP, 2826 IP_FW_ZERO, &rulenum, sizeof rulenum)) { 2827 warn("rule %u: setsockopt(IP_FW_ZERO)", 2828 rulenum); 2829 failed = EX_UNAVAILABLE; 2830 } else if (!do_quiet) 2831 printf("Entry %d cleared\n", rulenum); 2832 } else { 2833 errx(EX_USAGE, "invalid rule number ``%s''", *av); 2834 } 2835 } 2836 if (failed != EX_OK) 2837 exit(failed); 2838 } 2839 2840 static void 2841 resetlog (int ac, char *av[]) 2842 { 2843 int rulenum; 2844 int failed = EX_OK; 2845 2846 av++; ac--; 2847 2848 if (!ac) { 2849 /* clear all entries */ 2850 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0) 2851 err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)"); 2852 if (!do_quiet) 2853 printf("Logging counts reset.\n"); 2854 2855 return; 2856 } 2857 2858 while (ac) { 2859 /* Rule number */ 2860 if (isdigit(**av)) { 2861 rulenum = atoi(*av); 2862 av++; 2863 ac--; 2864 if (setsockopt(s, IPPROTO_IP, 2865 IP_FW_RESETLOG, &rulenum, sizeof rulenum)) { 2866 warn("rule %u: setsockopt(IP_FW_RESETLOG)", 2867 rulenum); 2868 failed = EX_UNAVAILABLE; 2869 } else if (!do_quiet) 2870 printf("Entry %d logging count reset\n", 2871 rulenum); 2872 } else { 2873 errx(EX_DATAERR, "invalid rule number ``%s''", *av); 2874 } 2875 } 2876 if (failed != EX_OK) 2877 exit(failed); 2878 } 2879 2880 static void 2881 flush() 2882 { 2883 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 2884 2885 if (!do_force && !do_quiet) { /* need to ask user */ 2886 int c; 2887 2888 printf("Are you sure? [yn] "); 2889 fflush(stdout); 2890 do { 2891 c = toupper(getc(stdin)); 2892 while (c != '\n' && getc(stdin) != '\n') 2893 if (feof(stdin)) 2894 return; /* and do not flush */ 2895 } while (c != 'Y' && c != 'N'); 2896 printf("\n"); 2897 if (c == 'N') /* user said no */ 2898 return; 2899 } 2900 if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0) 2901 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 2902 do_pipe ? "DUMMYNET" : "FW"); 2903 if (!do_quiet) 2904 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 2905 } 2906 2907 static int 2908 ipfw_main(int ac, char **av) 2909 { 2910 int ch; 2911 2912 if (ac == 1) 2913 show_usage(); 2914 2915 /* Set the force flag for non-interactive processes */ 2916 do_force = !isatty(STDIN_FILENO); 2917 2918 optind = optreset = 1; 2919 while ((ch = getopt(ac, av, "hs:adefNqtv")) != -1) 2920 switch (ch) { 2921 case 'h': /* help */ 2922 help(); 2923 break; /* NOTREACHED */ 2924 2925 case 's': /* sort */ 2926 do_sort = atoi(optarg); 2927 break; 2928 case 'a': 2929 do_acct = 1; 2930 break; 2931 case 'd': 2932 do_dynamic = 1; 2933 break; 2934 case 'e': 2935 do_expired = 1; 2936 break; 2937 case 'f': 2938 do_force = 1; 2939 break; 2940 case 'N': 2941 do_resolv = 1; 2942 break; 2943 case 'q': 2944 do_quiet = 1; 2945 break; 2946 case 't': 2947 do_time = 1; 2948 break; 2949 case 'v': /* verbose */ 2950 verbose++; 2951 break; 2952 default: 2953 show_usage(); 2954 } 2955 2956 ac -= optind; 2957 av += optind; 2958 NEED1("bad arguments, for usage summary ``ipfw''"); 2959 2960 /* 2961 * optional: pipe or queue 2962 */ 2963 if (!strncmp(*av, "pipe", strlen(*av))) { 2964 do_pipe = 1; 2965 ac--; 2966 av++; 2967 } else if (!strncmp(*av, "queue", strlen(*av))) { 2968 do_pipe = 2; 2969 ac--; 2970 av++; 2971 } 2972 NEED1("missing command"); 2973 2974 /* 2975 * for pipes and queues we normally say 'pipe NN config' 2976 * but the code is easier to parse as 'pipe config NN' 2977 * so we swap the two arguments. 2978 */ 2979 if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') { 2980 char *p = av[0]; 2981 av[0] = av[1]; 2982 av[1] = p; 2983 } 2984 if (!strncmp(*av, "add", strlen(*av))) 2985 add(ac, av); 2986 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 2987 config_pipe(ac, av); 2988 else if (!strncmp(*av, "delete", strlen(*av))) 2989 delete(ac, av); 2990 else if (!strncmp(*av, "flush", strlen(*av))) 2991 flush(); 2992 else if (!strncmp(*av, "zero", strlen(*av))) 2993 zero(ac, av); 2994 else if (!strncmp(*av, "resetlog", strlen(*av))) 2995 resetlog(ac, av); 2996 else if (!strncmp(*av, "print", strlen(*av)) || 2997 !strncmp(*av, "list", strlen(*av))) 2998 list(ac, av); 2999 else if (!strncmp(*av, "show", strlen(*av))) { 3000 do_acct++; 3001 list(ac, av); 3002 } else 3003 errx(EX_USAGE, "bad command `%s'", *av); 3004 return 0; 3005 } 3006 3007 3008 static void 3009 ipfw_readfile(int ac, char *av[]) 3010 { 3011 #define MAX_ARGS 32 3012 #define WHITESP " \t\f\v\n\r" 3013 char buf[BUFSIZ]; 3014 char *a, *p, *args[MAX_ARGS], *cmd = NULL; 3015 char linename[10]; 3016 int i=0, lineno=0, qflag=0, pflag=0, status; 3017 FILE *f = NULL; 3018 pid_t preproc = 0; 3019 int c; 3020 3021 while ((c = getopt(ac, av, "D:U:p:q")) != -1) 3022 switch(c) { 3023 case 'D': 3024 if (!pflag) 3025 errx(EX_USAGE, "-D requires -p"); 3026 if (i > MAX_ARGS - 2) 3027 errx(EX_USAGE, 3028 "too many -D or -U options"); 3029 args[i++] = "-D"; 3030 args[i++] = optarg; 3031 break; 3032 3033 case 'U': 3034 if (!pflag) 3035 errx(EX_USAGE, "-U requires -p"); 3036 if (i > MAX_ARGS - 2) 3037 errx(EX_USAGE, 3038 "too many -D or -U options"); 3039 args[i++] = "-U"; 3040 args[i++] = optarg; 3041 break; 3042 3043 case 'p': 3044 pflag = 1; 3045 cmd = optarg; 3046 args[0] = cmd; 3047 i = 1; 3048 break; 3049 3050 case 'q': 3051 qflag = 1; 3052 break; 3053 3054 default: 3055 errx(EX_USAGE, "bad arguments, for usage" 3056 " summary ``ipfw''"); 3057 } 3058 3059 av += optind; 3060 ac -= optind; 3061 if (ac != 1) 3062 errx(EX_USAGE, "extraneous filename arguments"); 3063 3064 if ((f = fopen(av[0], "r")) == NULL) 3065 err(EX_UNAVAILABLE, "fopen: %s", av[0]); 3066 3067 if (pflag) { 3068 /* pipe through preprocessor (cpp or m4) */ 3069 int pipedes[2]; 3070 3071 args[i] = 0; 3072 3073 if (pipe(pipedes) == -1) 3074 err(EX_OSERR, "cannot create pipe"); 3075 3076 switch((preproc = fork())) { 3077 case -1: 3078 err(EX_OSERR, "cannot fork"); 3079 3080 case 0: 3081 /* child */ 3082 if (dup2(fileno(f), 0) == -1 3083 || dup2(pipedes[1], 1) == -1) 3084 err(EX_OSERR, "dup2()"); 3085 fclose(f); 3086 close(pipedes[1]); 3087 close(pipedes[0]); 3088 execvp(cmd, args); 3089 err(EX_OSERR, "execvp(%s) failed", cmd); 3090 3091 default: 3092 /* parent */ 3093 fclose(f); 3094 close(pipedes[1]); 3095 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3096 int savederrno = errno; 3097 3098 (void)kill(preproc, SIGTERM); 3099 errno = savederrno; 3100 err(EX_OSERR, "fdopen()"); 3101 } 3102 } 3103 } 3104 3105 while (fgets(buf, BUFSIZ, f)) { 3106 lineno++; 3107 sprintf(linename, "Line %d", lineno); 3108 args[0] = linename; 3109 3110 if (*buf == '#') 3111 continue; 3112 if ((p = strchr(buf, '#')) != NULL) 3113 *p = '\0'; 3114 i = 1; 3115 if (qflag) 3116 args[i++] = "-q"; 3117 for (a = strtok(buf, WHITESP); 3118 a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++) 3119 args[i] = a; 3120 if (i == (qflag? 2: 1)) 3121 continue; 3122 if (i == MAX_ARGS) 3123 errx(EX_USAGE, "%s: too many arguments", 3124 linename); 3125 args[i] = NULL; 3126 3127 ipfw_main(i, args); 3128 } 3129 fclose(f); 3130 if (pflag) { 3131 if (waitpid(preproc, &status, 0) == -1) 3132 errx(EX_OSERR, "waitpid()"); 3133 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3134 errx(EX_UNAVAILABLE, 3135 "preprocessor exited with status %d", 3136 WEXITSTATUS(status)); 3137 else if (WIFSIGNALED(status)) 3138 errx(EX_UNAVAILABLE, 3139 "preprocessor exited with signal %d", 3140 WTERMSIG(status)); 3141 } 3142 } 3143 3144 int 3145 main(int ac, char *av[]) 3146 { 3147 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 3148 if (s < 0) 3149 err(EX_UNAVAILABLE, "socket"); 3150 3151 setbuf(stdout, 0); 3152 3153 /* 3154 * If the last argument is an absolute pathname, interpret it 3155 * as a file to be preprocessed. 3156 */ 3157 3158 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3159 ipfw_readfile(ac, av); 3160 else 3161 ipfw_main(ac, av); 3162 return EX_OK; 3163 } 3164