1 /* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/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> /* XXX do we need this ? */ 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 <netinet/ip_dummynet.h> 54 #include <netinet/tcp.h> 55 #include <arpa/inet.h> 56 57 int 58 do_resolv, /* Would try to resolve all */ 59 do_time, /* Show time stamps */ 60 do_quiet, /* Be quiet in add and flush */ 61 do_pipe, /* this cmd refers to a pipe */ 62 do_sort, /* field to sort results (0 = no) */ 63 do_dynamic, /* display dynamic rules */ 64 do_expired, /* display expired dynamic rules */ 65 do_compact, /* show rules in compact mode */ 66 do_force, /* do not ask for confirmation */ 67 show_sets, /* display rule sets */ 68 test_only, /* only check syntax */ 69 comment_only, /* only print action and comment */ 70 verbose; 71 72 #define IP_MASK_ALL 0xffffffff 73 /* 74 * the following macro returns an error message if we run out of 75 * arguments. 76 */ 77 #define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 78 79 /* 80 * _s_x is a structure that stores a string <-> token pairs, used in 81 * various places in the parser. Entries are stored in arrays, 82 * with an entry with s=NULL as terminator. 83 * The search routines are match_token() and match_value(). 84 * Often, an element with x=0 contains an error string. 85 * 86 */ 87 struct _s_x { 88 char const *s; 89 int x; 90 }; 91 92 static struct _s_x f_tcpflags[] = { 93 { "syn", TH_SYN }, 94 { "fin", TH_FIN }, 95 { "ack", TH_ACK }, 96 { "psh", TH_PUSH }, 97 { "rst", TH_RST }, 98 { "urg", TH_URG }, 99 { "tcp flag", 0 }, 100 { NULL, 0 } 101 }; 102 103 static struct _s_x f_tcpopts[] = { 104 { "mss", IP_FW_TCPOPT_MSS }, 105 { "maxseg", IP_FW_TCPOPT_MSS }, 106 { "window", IP_FW_TCPOPT_WINDOW }, 107 { "sack", IP_FW_TCPOPT_SACK }, 108 { "ts", IP_FW_TCPOPT_TS }, 109 { "timestamp", IP_FW_TCPOPT_TS }, 110 { "cc", IP_FW_TCPOPT_CC }, 111 { "tcp option", 0 }, 112 { NULL, 0 } 113 }; 114 115 /* 116 * IP options span the range 0 to 255 so we need to remap them 117 * (though in fact only the low 5 bits are significant). 118 */ 119 static struct _s_x f_ipopts[] = { 120 { "ssrr", IP_FW_IPOPT_SSRR}, 121 { "lsrr", IP_FW_IPOPT_LSRR}, 122 { "rr", IP_FW_IPOPT_RR}, 123 { "ts", IP_FW_IPOPT_TS}, 124 { "ip option", 0 }, 125 { NULL, 0 } 126 }; 127 128 static struct _s_x f_iptos[] = { 129 { "lowdelay", IPTOS_LOWDELAY}, 130 { "throughput", IPTOS_THROUGHPUT}, 131 { "reliability", IPTOS_RELIABILITY}, 132 { "mincost", IPTOS_MINCOST}, 133 { "congestion", IPTOS_CE}, 134 { "ecntransport", IPTOS_ECT}, 135 { "ip tos option", 0}, 136 { NULL, 0 } 137 }; 138 139 static struct _s_x limit_masks[] = { 140 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 141 {"src-addr", DYN_SRC_ADDR}, 142 {"src-port", DYN_SRC_PORT}, 143 {"dst-addr", DYN_DST_ADDR}, 144 {"dst-port", DYN_DST_PORT}, 145 {NULL, 0} 146 }; 147 148 /* 149 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 150 * This is only used in this code. 151 */ 152 #define IPPROTO_ETHERTYPE 0x1000 153 static struct _s_x ether_types[] = { 154 /* 155 * Note, we cannot use "-:&/" in the names because they are field 156 * separators in the type specifications. Also, we use s = NULL as 157 * end-delimiter, because a type of 0 can be legal. 158 */ 159 { "ip", 0x0800 }, 160 { "ipv4", 0x0800 }, 161 { "ipv6", 0x86dd }, 162 { "arp", 0x0806 }, 163 { "rarp", 0x8035 }, 164 { "vlan", 0x8100 }, 165 { "loop", 0x9000 }, 166 { "trail", 0x1000 }, 167 { "at", 0x809b }, 168 { "atalk", 0x809b }, 169 { "aarp", 0x80f3 }, 170 { "pppoe_disc", 0x8863 }, 171 { "pppoe_sess", 0x8864 }, 172 { "ipx_8022", 0x00E0 }, 173 { "ipx_8023", 0x0000 }, 174 { "ipx_ii", 0x8137 }, 175 { "ipx_snap", 0x8137 }, 176 { "ipx", 0x8137 }, 177 { "ns", 0x0600 }, 178 { NULL, 0 } 179 }; 180 181 static void show_usage(void); 182 183 enum tokens { 184 TOK_NULL=0, 185 186 TOK_OR, 187 TOK_NOT, 188 TOK_STARTBRACE, 189 TOK_ENDBRACE, 190 191 TOK_ACCEPT, 192 TOK_COUNT, 193 TOK_PIPE, 194 TOK_QUEUE, 195 TOK_DIVERT, 196 TOK_TEE, 197 TOK_FORWARD, 198 TOK_SKIPTO, 199 TOK_DENY, 200 TOK_REJECT, 201 TOK_RESET, 202 TOK_UNREACH, 203 TOK_CHECKSTATE, 204 205 TOK_UID, 206 TOK_GID, 207 TOK_IN, 208 TOK_LIMIT, 209 TOK_KEEPSTATE, 210 TOK_LAYER2, 211 TOK_OUT, 212 TOK_XMIT, 213 TOK_RECV, 214 TOK_VIA, 215 TOK_FRAG, 216 TOK_IPOPTS, 217 TOK_IPLEN, 218 TOK_IPID, 219 TOK_IPPRECEDENCE, 220 TOK_IPTOS, 221 TOK_IPTTL, 222 TOK_IPVER, 223 TOK_ESTAB, 224 TOK_SETUP, 225 TOK_TCPFLAGS, 226 TOK_TCPOPTS, 227 TOK_TCPSEQ, 228 TOK_TCPACK, 229 TOK_TCPWIN, 230 TOK_ICMPTYPES, 231 TOK_MAC, 232 TOK_MACTYPE, 233 TOK_VERREVPATH, 234 TOK_VERSRCREACH, 235 TOK_IPSEC, 236 TOK_COMMENT, 237 238 TOK_PLR, 239 TOK_NOERROR, 240 TOK_BUCKETS, 241 TOK_DSTIP, 242 TOK_SRCIP, 243 TOK_DSTPORT, 244 TOK_SRCPORT, 245 TOK_ALL, 246 TOK_MASK, 247 TOK_BW, 248 TOK_DELAY, 249 TOK_RED, 250 TOK_GRED, 251 TOK_DROPTAIL, 252 TOK_PROTO, 253 TOK_WEIGHT, 254 }; 255 256 struct _s_x dummynet_params[] = { 257 { "plr", TOK_PLR }, 258 { "noerror", TOK_NOERROR }, 259 { "buckets", TOK_BUCKETS }, 260 { "dst-ip", TOK_DSTIP }, 261 { "src-ip", TOK_SRCIP }, 262 { "dst-port", TOK_DSTPORT }, 263 { "src-port", TOK_SRCPORT }, 264 { "proto", TOK_PROTO }, 265 { "weight", TOK_WEIGHT }, 266 { "all", TOK_ALL }, 267 { "mask", TOK_MASK }, 268 { "droptail", TOK_DROPTAIL }, 269 { "red", TOK_RED }, 270 { "gred", TOK_GRED }, 271 { "bw", TOK_BW }, 272 { "bandwidth", TOK_BW }, 273 { "delay", TOK_DELAY }, 274 { "pipe", TOK_PIPE }, 275 { "queue", TOK_QUEUE }, 276 { "dummynet-params", TOK_NULL }, 277 { NULL, 0 } /* terminator */ 278 }; 279 280 struct _s_x rule_actions[] = { 281 { "accept", TOK_ACCEPT }, 282 { "pass", TOK_ACCEPT }, 283 { "allow", TOK_ACCEPT }, 284 { "permit", TOK_ACCEPT }, 285 { "count", TOK_COUNT }, 286 { "pipe", TOK_PIPE }, 287 { "queue", TOK_QUEUE }, 288 { "divert", TOK_DIVERT }, 289 { "tee", TOK_TEE }, 290 { "fwd", TOK_FORWARD }, 291 { "forward", TOK_FORWARD }, 292 { "skipto", TOK_SKIPTO }, 293 { "deny", TOK_DENY }, 294 { "drop", TOK_DENY }, 295 { "reject", TOK_REJECT }, 296 { "reset", TOK_RESET }, 297 { "unreach", TOK_UNREACH }, 298 { "check-state", TOK_CHECKSTATE }, 299 { "//", TOK_COMMENT }, 300 { NULL, 0 } /* terminator */ 301 }; 302 303 struct _s_x rule_options[] = { 304 { "uid", TOK_UID }, 305 { "gid", TOK_GID }, 306 { "in", TOK_IN }, 307 { "limit", TOK_LIMIT }, 308 { "keep-state", TOK_KEEPSTATE }, 309 { "bridged", TOK_LAYER2 }, 310 { "layer2", TOK_LAYER2 }, 311 { "out", TOK_OUT }, 312 { "xmit", TOK_XMIT }, 313 { "recv", TOK_RECV }, 314 { "via", TOK_VIA }, 315 { "fragment", TOK_FRAG }, 316 { "frag", TOK_FRAG }, 317 { "ipoptions", TOK_IPOPTS }, 318 { "ipopts", TOK_IPOPTS }, 319 { "iplen", TOK_IPLEN }, 320 { "ipid", TOK_IPID }, 321 { "ipprecedence", TOK_IPPRECEDENCE }, 322 { "iptos", TOK_IPTOS }, 323 { "ipttl", TOK_IPTTL }, 324 { "ipversion", TOK_IPVER }, 325 { "ipver", TOK_IPVER }, 326 { "estab", TOK_ESTAB }, 327 { "established", TOK_ESTAB }, 328 { "setup", TOK_SETUP }, 329 { "tcpflags", TOK_TCPFLAGS }, 330 { "tcpflgs", TOK_TCPFLAGS }, 331 { "tcpoptions", TOK_TCPOPTS }, 332 { "tcpopts", TOK_TCPOPTS }, 333 { "tcpseq", TOK_TCPSEQ }, 334 { "tcpack", TOK_TCPACK }, 335 { "tcpwin", TOK_TCPWIN }, 336 { "icmptype", TOK_ICMPTYPES }, 337 { "icmptypes", TOK_ICMPTYPES }, 338 { "dst-ip", TOK_DSTIP }, 339 { "src-ip", TOK_SRCIP }, 340 { "dst-port", TOK_DSTPORT }, 341 { "src-port", TOK_SRCPORT }, 342 { "proto", TOK_PROTO }, 343 { "MAC", TOK_MAC }, 344 { "mac", TOK_MAC }, 345 { "mac-type", TOK_MACTYPE }, 346 { "verrevpath", TOK_VERREVPATH }, 347 { "versrcreach", TOK_VERSRCREACH }, 348 { "ipsec", TOK_IPSEC }, 349 { "//", TOK_COMMENT }, 350 351 { "not", TOK_NOT }, /* pseudo option */ 352 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 353 { "or", TOK_OR }, /* pseudo option */ 354 { "|", /* escape */ TOK_OR }, /* pseudo option */ 355 { "{", TOK_STARTBRACE }, /* pseudo option */ 356 { "(", TOK_STARTBRACE }, /* pseudo option */ 357 { "}", TOK_ENDBRACE }, /* pseudo option */ 358 { ")", TOK_ENDBRACE }, /* pseudo option */ 359 { NULL, 0 } /* terminator */ 360 }; 361 362 static __inline uint64_t 363 align_uint64(uint64_t *pll) { 364 uint64_t ret; 365 366 bcopy (pll, &ret, sizeof(ret)); 367 return ret; 368 } 369 370 /* 371 * conditionally runs the command. 372 */ 373 static int 374 do_cmd(int optname, void *optval, uintptr_t optlen) 375 { 376 static int s = -1; /* the socket */ 377 int i; 378 379 if (test_only) 380 return 0; 381 382 if (s == -1) 383 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 384 if (s < 0) 385 err(EX_UNAVAILABLE, "socket"); 386 387 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 388 optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || 389 optname == IP_FW_TABLE_GETSIZE) 390 i = getsockopt(s, IPPROTO_IP, optname, optval, 391 (socklen_t *)optlen); 392 else 393 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 394 return i; 395 } 396 397 /** 398 * match_token takes a table and a string, returns the value associated 399 * with the string (-1 in case of failure). 400 */ 401 static int 402 match_token(struct _s_x *table, char *string) 403 { 404 struct _s_x *pt; 405 uint i = strlen(string); 406 407 for (pt = table ; i && pt->s != NULL ; pt++) 408 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 409 return pt->x; 410 return -1; 411 } 412 413 /** 414 * match_value takes a table and a value, returns the string associated 415 * with the value (NULL in case of failure). 416 */ 417 static char const * 418 match_value(struct _s_x *p, int value) 419 { 420 for (; p->s != NULL; p++) 421 if (p->x == value) 422 return p->s; 423 return NULL; 424 } 425 426 /* 427 * prints one port, symbolic or numeric 428 */ 429 static void 430 print_port(int proto, uint16_t port) 431 { 432 433 if (proto == IPPROTO_ETHERTYPE) { 434 char const *s; 435 436 if (do_resolv && (s = match_value(ether_types, port)) ) 437 printf("%s", s); 438 else 439 printf("0x%04x", port); 440 } else { 441 struct servent *se = NULL; 442 if (do_resolv) { 443 struct protoent *pe = getprotobynumber(proto); 444 445 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 446 } 447 if (se) 448 printf("%s", se->s_name); 449 else 450 printf("%d", port); 451 } 452 } 453 454 struct _s_x _port_name[] = { 455 {"dst-port", O_IP_DSTPORT}, 456 {"src-port", O_IP_SRCPORT}, 457 {"ipid", O_IPID}, 458 {"iplen", O_IPLEN}, 459 {"ipttl", O_IPTTL}, 460 {"mac-type", O_MAC_TYPE}, 461 {NULL, 0} 462 }; 463 464 /* 465 * Print the values in a list 16-bit items of the types above. 466 * XXX todo: add support for mask. 467 */ 468 static void 469 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 470 { 471 uint16_t *p = cmd->ports; 472 int i; 473 char const *sep; 474 475 if (cmd->o.len & F_NOT) 476 printf(" not"); 477 if (opcode != 0) { 478 sep = match_value(_port_name, opcode); 479 if (sep == NULL) 480 sep = "???"; 481 printf (" %s", sep); 482 } 483 sep = " "; 484 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 485 printf(sep); 486 print_port(proto, p[0]); 487 if (p[0] != p[1]) { 488 printf("-"); 489 print_port(proto, p[1]); 490 } 491 sep = ","; 492 } 493 } 494 495 /* 496 * Like strtol, but also translates service names into port numbers 497 * for some protocols. 498 * In particular: 499 * proto == -1 disables the protocol check; 500 * proto == IPPROTO_ETHERTYPE looks up an internal table 501 * proto == <some value in /etc/protocols> matches the values there. 502 * Returns *end == s in case the parameter is not found. 503 */ 504 static int 505 strtoport(char *s, char **end, int base, int proto) 506 { 507 char *p, *buf; 508 char *s1; 509 int i; 510 511 *end = s; /* default - not found */ 512 if (*s == '\0') 513 return 0; /* not found */ 514 515 if (isdigit(*s)) 516 return strtol(s, end, base); 517 518 /* 519 * find separator. '\\' escapes the next char. 520 */ 521 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 522 if (*s1 == '\\' && s1[1] != '\0') 523 s1++; 524 525 buf = malloc(s1 - s + 1); 526 if (buf == NULL) 527 return 0; 528 529 /* 530 * copy into a buffer skipping backslashes 531 */ 532 for (p = s, i = 0; p != s1 ; p++) 533 if (*p != '\\') 534 buf[i++] = *p; 535 buf[i++] = '\0'; 536 537 if (proto == IPPROTO_ETHERTYPE) { 538 i = match_token(ether_types, buf); 539 free(buf); 540 if (i != -1) { /* found */ 541 *end = s1; 542 return i; 543 } 544 } else { 545 struct protoent *pe = NULL; 546 struct servent *se; 547 548 if (proto != 0) 549 pe = getprotobynumber(proto); 550 setservent(1); 551 se = getservbyname(buf, pe ? pe->p_name : NULL); 552 free(buf); 553 if (se != NULL) { 554 *end = s1; 555 return ntohs(se->s_port); 556 } 557 } 558 return 0; /* not found */ 559 } 560 561 /* 562 * Fill the body of the command with the list of port ranges. 563 */ 564 static int 565 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 566 { 567 uint16_t a, b, *p = cmd->ports; 568 int i = 0; 569 char *s = av; 570 571 while (*s) { 572 a = strtoport(av, &s, 0, proto); 573 if (s == av) /* no parameter */ 574 break; 575 if (*s == '-') { /* a range */ 576 av = s+1; 577 b = strtoport(av, &s, 0, proto); 578 if (s == av) /* no parameter */ 579 break; 580 p[0] = a; 581 p[1] = b; 582 } else if (*s == ',' || *s == '\0' ) 583 p[0] = p[1] = a; 584 else /* invalid separator */ 585 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 586 *s, av); 587 i++; 588 p += 2; 589 av = s+1; 590 } 591 if (i > 0) { 592 if (i+1 > F_LEN_MASK) 593 errx(EX_DATAERR, "too many ports/ranges\n"); 594 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 595 } 596 return i; 597 } 598 599 static struct _s_x icmpcodes[] = { 600 { "net", ICMP_UNREACH_NET }, 601 { "host", ICMP_UNREACH_HOST }, 602 { "protocol", ICMP_UNREACH_PROTOCOL }, 603 { "port", ICMP_UNREACH_PORT }, 604 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 605 { "srcfail", ICMP_UNREACH_SRCFAIL }, 606 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 607 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 608 { "isolated", ICMP_UNREACH_ISOLATED }, 609 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 610 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 611 { "tosnet", ICMP_UNREACH_TOSNET }, 612 { "toshost", ICMP_UNREACH_TOSHOST }, 613 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 614 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 615 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 616 { NULL, 0 } 617 }; 618 619 static void 620 fill_reject_code(u_short *codep, char *str) 621 { 622 int val; 623 char *s; 624 625 val = strtoul(str, &s, 0); 626 if (s == str || *s != '\0' || val >= 0x100) 627 val = match_token(icmpcodes, str); 628 if (val < 0) 629 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 630 *codep = val; 631 return; 632 } 633 634 static void 635 print_reject_code(uint16_t code) 636 { 637 char const *s = match_value(icmpcodes, code); 638 639 if (s != NULL) 640 printf("unreach %s", s); 641 else 642 printf("unreach %u", code); 643 } 644 645 /* 646 * Returns the number of bits set (from left) in a contiguous bitmask, 647 * or -1 if the mask is not contiguous. 648 * XXX this needs a proper fix. 649 * This effectively works on masks in big-endian (network) format. 650 * when compiled on little endian architectures. 651 * 652 * First bit is bit 7 of the first byte -- note, for MAC addresses, 653 * the first bit on the wire is bit 0 of the first byte. 654 * len is the max length in bits. 655 */ 656 static int 657 contigmask(uint8_t *p, int len) 658 { 659 int i, n; 660 661 for (i=0; i<len ; i++) 662 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 663 break; 664 for (n=i+1; n < len; n++) 665 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 666 return -1; /* mask not contiguous */ 667 return i; 668 } 669 670 /* 671 * print flags set/clear in the two bitmasks passed as parameters. 672 * There is a specialized check for f_tcpflags. 673 */ 674 static void 675 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 676 { 677 char const *comma = ""; 678 int i; 679 uint8_t set = cmd->arg1 & 0xff; 680 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 681 682 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 683 printf(" setup"); 684 return; 685 } 686 687 printf(" %s ", name); 688 for (i=0; list[i].x != 0; i++) { 689 if (set & list[i].x) { 690 set &= ~list[i].x; 691 printf("%s%s", comma, list[i].s); 692 comma = ","; 693 } 694 if (clear & list[i].x) { 695 clear &= ~list[i].x; 696 printf("%s!%s", comma, list[i].s); 697 comma = ","; 698 } 699 } 700 } 701 702 /* 703 * Print the ip address contained in a command. 704 */ 705 static void 706 print_ip(ipfw_insn_ip *cmd, char const *s) 707 { 708 struct hostent *he = NULL; 709 int len = F_LEN((ipfw_insn *)cmd); 710 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 711 712 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 713 714 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 715 printf("me"); 716 return; 717 } 718 if (cmd->o.opcode == O_IP_SRC_LOOKUP || 719 cmd->o.opcode == O_IP_DST_LOOKUP) { 720 printf("table(%u", ((ipfw_insn *)cmd)->arg1); 721 if (len == F_INSN_SIZE(ipfw_insn_u32)) 722 printf(",%u", *a); 723 printf(")"); 724 return; 725 } 726 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 727 uint32_t x, *map = (uint32_t *)&(cmd->mask); 728 int i, j; 729 char comma = '{'; 730 731 x = cmd->o.arg1 - 1; 732 x = htonl( ~x ); 733 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 734 printf("%s/%d", inet_ntoa(cmd->addr), 735 contigmask((uint8_t *)&x, 32)); 736 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 737 x &= 0xff; /* base */ 738 /* 739 * Print bits and ranges. 740 * Locate first bit set (i), then locate first bit unset (j). 741 * If we have 3+ consecutive bits set, then print them as a 742 * range, otherwise only print the initial bit and rescan. 743 */ 744 for (i=0; i < cmd->o.arg1; i++) 745 if (map[i/32] & (1<<(i & 31))) { 746 for (j=i+1; j < cmd->o.arg1; j++) 747 if (!(map[ j/32] & (1<<(j & 31)))) 748 break; 749 printf("%c%d", comma, i+x); 750 if (j>i+2) { /* range has at least 3 elements */ 751 printf("-%d", j-1+x); 752 i = j-1; 753 } 754 comma = ','; 755 } 756 printf("}"); 757 return; 758 } 759 /* 760 * len == 2 indicates a single IP, whereas lists of 1 or more 761 * addr/mask pairs have len = (2n+1). We convert len to n so we 762 * use that to count the number of entries. 763 */ 764 for (len = len / 2; len > 0; len--, a += 2) { 765 int mb = /* mask length */ 766 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 767 32 : contigmask((uint8_t *)&(a[1]), 32); 768 if (mb == 32 && do_resolv) 769 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 770 if (he != NULL) /* resolved to name */ 771 printf("%s", he->h_name); 772 else if (mb == 0) /* any */ 773 printf("any"); 774 else { /* numeric IP followed by some kind of mask */ 775 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 776 if (mb < 0) 777 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 778 else if (mb < 32) 779 printf("/%d", mb); 780 } 781 if (len > 1) 782 printf(","); 783 } 784 } 785 786 /* 787 * prints a MAC address/mask pair 788 */ 789 static void 790 print_mac(uint8_t *addr, uint8_t *mask) 791 { 792 int l = contigmask(mask, 48); 793 794 if (l == 0) 795 printf(" any"); 796 else { 797 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 798 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 799 if (l == -1) 800 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 801 mask[0], mask[1], mask[2], 802 mask[3], mask[4], mask[5]); 803 else if (l < 48) 804 printf("/%d", l); 805 } 806 } 807 808 static void 809 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 810 { 811 uint8_t type; 812 813 cmd->d[0] = 0; 814 while (*av) { 815 if (*av == ',') 816 av++; 817 818 type = strtoul(av, &av, 0); 819 820 if (*av != ',' && *av != '\0') 821 errx(EX_DATAERR, "invalid ICMP type"); 822 823 if (type > 31) 824 errx(EX_DATAERR, "ICMP type out of range"); 825 826 cmd->d[0] |= 1 << type; 827 } 828 cmd->o.opcode = O_ICMPTYPE; 829 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 830 } 831 832 static void 833 print_icmptypes(ipfw_insn_u32 *cmd) 834 { 835 int i; 836 char sep= ' '; 837 838 printf(" icmptypes"); 839 for (i = 0; i < 32; i++) { 840 if ( (cmd->d[0] & (1 << (i))) == 0) 841 continue; 842 printf("%c%d", sep, i); 843 sep = ','; 844 } 845 } 846 847 /* 848 * show_ipfw() prints the body of an ipfw rule. 849 * Because the standard rule has at least proto src_ip dst_ip, we use 850 * a helper function to produce these entries if not provided explicitly. 851 * The first argument is the list of fields we have, the second is 852 * the list of fields we want to be printed. 853 * 854 * Special cases if we have provided a MAC header: 855 * + if the rule does not contain IP addresses/ports, do not print them; 856 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 857 * 858 * Once we have 'have_options', IP header fields are printed as options. 859 */ 860 #define HAVE_PROTO 0x0001 861 #define HAVE_SRCIP 0x0002 862 #define HAVE_DSTIP 0x0004 863 #define HAVE_MAC 0x0008 864 #define HAVE_MACTYPE 0x0010 865 #define HAVE_OPTIONS 0x8000 866 867 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 868 static void 869 show_prerequisites(int *flags, int want, int cmd) 870 { 871 if (comment_only) 872 return; 873 if ( (*flags & HAVE_IP) == HAVE_IP) 874 *flags |= HAVE_OPTIONS; 875 876 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 877 cmd != O_MAC_TYPE) { 878 /* 879 * mac-type was optimized out by the compiler, 880 * restore it 881 */ 882 printf(" any"); 883 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 884 return; 885 } 886 if ( !(*flags & HAVE_OPTIONS)) { 887 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 888 printf(" ip"); 889 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 890 printf(" from any"); 891 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 892 printf(" to any"); 893 } 894 *flags |= want; 895 } 896 897 static void 898 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 899 { 900 static int twidth = 0; 901 int l; 902 ipfw_insn *cmd; 903 char *comment = NULL; /* ptr to comment if we have one */ 904 int proto = 0; /* default */ 905 int flags = 0; /* prerequisites */ 906 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 907 int or_block = 0; /* we are in an or block */ 908 uint32_t set_disable; 909 910 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 911 912 if (set_disable & (1 << rule->set)) { /* disabled */ 913 if (!show_sets) 914 return; 915 else 916 printf("# DISABLED "); 917 } 918 printf("%05u ", rule->rulenum); 919 920 if (pcwidth>0 || bcwidth>0) 921 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 922 bcwidth, align_uint64(&rule->bcnt)); 923 924 if (do_time == 2) 925 printf("%10u ", rule->timestamp); 926 else if (do_time == 1) { 927 char timestr[30]; 928 time_t t = (time_t)0; 929 930 if (twidth == 0) { 931 strcpy(timestr, ctime(&t)); 932 *strchr(timestr, '\n') = '\0'; 933 twidth = strlen(timestr); 934 } 935 if (rule->timestamp) { 936 #if _FreeBSD_version < 500000 /* XXX check */ 937 #define _long_to_time(x) (time_t)(x) 938 #endif 939 t = _long_to_time(rule->timestamp); 940 941 strcpy(timestr, ctime(&t)); 942 *strchr(timestr, '\n') = '\0'; 943 printf("%s ", timestr); 944 } else { 945 printf("%*s", twidth, " "); 946 } 947 } 948 949 if (show_sets) 950 printf("set %d ", rule->set); 951 952 /* 953 * print the optional "match probability" 954 */ 955 if (rule->cmd_len > 0) { 956 cmd = rule->cmd ; 957 if (cmd->opcode == O_PROB) { 958 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 959 double d = 1.0 * p->d[0]; 960 961 d = (d / 0x7fffffff); 962 printf("prob %f ", d); 963 } 964 } 965 966 /* 967 * first print actions 968 */ 969 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 970 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 971 switch(cmd->opcode) { 972 case O_CHECK_STATE: 973 printf("check-state"); 974 flags = HAVE_IP; /* avoid printing anything else */ 975 break; 976 977 case O_ACCEPT: 978 printf("allow"); 979 break; 980 981 case O_COUNT: 982 printf("count"); 983 break; 984 985 case O_DENY: 986 printf("deny"); 987 break; 988 989 case O_REJECT: 990 if (cmd->arg1 == ICMP_REJECT_RST) 991 printf("reset"); 992 else if (cmd->arg1 == ICMP_UNREACH_HOST) 993 printf("reject"); 994 else 995 print_reject_code(cmd->arg1); 996 break; 997 998 case O_SKIPTO: 999 printf("skipto %u", cmd->arg1); 1000 break; 1001 1002 case O_PIPE: 1003 printf("pipe %u", cmd->arg1); 1004 break; 1005 1006 case O_QUEUE: 1007 printf("queue %u", cmd->arg1); 1008 break; 1009 1010 case O_DIVERT: 1011 printf("divert %u", cmd->arg1); 1012 break; 1013 1014 case O_TEE: 1015 printf("tee %u", cmd->arg1); 1016 break; 1017 1018 case O_FORWARD_IP: 1019 { 1020 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1021 1022 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1023 if (s->sa.sin_port) 1024 printf(",%d", s->sa.sin_port); 1025 } 1026 break; 1027 1028 case O_LOG: /* O_LOG is printed last */ 1029 logptr = (ipfw_insn_log *)cmd; 1030 break; 1031 1032 default: 1033 printf("** unrecognized action %d len %d", 1034 cmd->opcode, cmd->len); 1035 } 1036 } 1037 if (logptr) { 1038 if (logptr->max_log > 0) 1039 printf(" log logamount %d", logptr->max_log); 1040 else 1041 printf(" log"); 1042 } 1043 1044 /* 1045 * then print the body. 1046 */ 1047 if (rule->_pad & 1) { /* empty rules before options */ 1048 if (!do_compact) 1049 printf(" ip from any to any"); 1050 flags |= HAVE_IP | HAVE_OPTIONS; 1051 } 1052 1053 if (comment_only) 1054 comment = "..."; 1055 1056 for (l = rule->act_ofs, cmd = rule->cmd ; 1057 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1058 /* useful alias */ 1059 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1060 1061 if (comment_only) { 1062 if (cmd->opcode != O_NOP) 1063 continue; 1064 printf(" // %s\n", (char *)(cmd + 1)); 1065 return; 1066 } 1067 1068 show_prerequisites(&flags, 0, cmd->opcode); 1069 1070 switch(cmd->opcode) { 1071 case O_PROB: 1072 break; /* done already */ 1073 1074 case O_PROBE_STATE: 1075 break; /* no need to print anything here */ 1076 1077 case O_MACADDR2: { 1078 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1079 1080 if ((cmd->len & F_OR) && !or_block) 1081 printf(" {"); 1082 if (cmd->len & F_NOT) 1083 printf(" not"); 1084 printf(" MAC"); 1085 flags |= HAVE_MAC; 1086 print_mac(m->addr, m->mask); 1087 print_mac(m->addr + 6, m->mask + 6); 1088 } 1089 break; 1090 1091 case O_MAC_TYPE: 1092 if ((cmd->len & F_OR) && !or_block) 1093 printf(" {"); 1094 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1095 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1096 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1097 break; 1098 1099 case O_IP_SRC: 1100 case O_IP_SRC_LOOKUP: 1101 case O_IP_SRC_MASK: 1102 case O_IP_SRC_ME: 1103 case O_IP_SRC_SET: 1104 show_prerequisites(&flags, HAVE_PROTO, 0); 1105 if (!(flags & HAVE_SRCIP)) 1106 printf(" from"); 1107 if ((cmd->len & F_OR) && !or_block) 1108 printf(" {"); 1109 print_ip((ipfw_insn_ip *)cmd, 1110 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1111 flags |= HAVE_SRCIP; 1112 break; 1113 1114 case O_IP_DST: 1115 case O_IP_DST_LOOKUP: 1116 case O_IP_DST_MASK: 1117 case O_IP_DST_ME: 1118 case O_IP_DST_SET: 1119 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1120 if (!(flags & HAVE_DSTIP)) 1121 printf(" to"); 1122 if ((cmd->len & F_OR) && !or_block) 1123 printf(" {"); 1124 print_ip((ipfw_insn_ip *)cmd, 1125 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1126 flags |= HAVE_DSTIP; 1127 break; 1128 1129 case O_IP_DSTPORT: 1130 show_prerequisites(&flags, HAVE_IP, 0); 1131 case O_IP_SRCPORT: 1132 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1133 if ((cmd->len & F_OR) && !or_block) 1134 printf(" {"); 1135 print_newports((ipfw_insn_u16 *)cmd, proto, 1136 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1137 break; 1138 1139 case O_PROTO: { 1140 struct protoent *pe; 1141 1142 if ((cmd->len & F_OR) && !or_block) 1143 printf(" {"); 1144 if (cmd->len & F_NOT) 1145 printf(" not"); 1146 proto = cmd->arg1; 1147 pe = getprotobynumber(cmd->arg1); 1148 if (flags & HAVE_OPTIONS) 1149 printf(" proto"); 1150 if (pe) 1151 printf(" %s", pe->p_name); 1152 else 1153 printf(" %u", cmd->arg1); 1154 } 1155 flags |= HAVE_PROTO; 1156 break; 1157 1158 default: /*options ... */ 1159 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1160 if ((cmd->len & F_OR) && !or_block) 1161 printf(" {"); 1162 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1163 printf(" not"); 1164 switch(cmd->opcode) { 1165 case O_FRAG: 1166 printf(" frag"); 1167 break; 1168 1169 case O_IN: 1170 printf(cmd->len & F_NOT ? " out" : " in"); 1171 break; 1172 1173 case O_LAYER2: 1174 printf(" layer2"); 1175 break; 1176 case O_XMIT: 1177 case O_RECV: 1178 case O_VIA: { 1179 char const *s; 1180 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1181 1182 if (cmd->opcode == O_XMIT) 1183 s = "xmit"; 1184 else if (cmd->opcode == O_RECV) 1185 s = "recv"; 1186 else /* if (cmd->opcode == O_VIA) */ 1187 s = "via"; 1188 if (cmdif->name[0] == '\0') 1189 printf(" %s %s", s, 1190 inet_ntoa(cmdif->p.ip)); 1191 printf(" %s %s", s, cmdif->name); 1192 } 1193 break; 1194 1195 case O_IPID: 1196 if (F_LEN(cmd) == 1) 1197 printf(" ipid %u", cmd->arg1 ); 1198 else 1199 print_newports((ipfw_insn_u16 *)cmd, 0, 1200 O_IPID); 1201 break; 1202 1203 case O_IPTTL: 1204 if (F_LEN(cmd) == 1) 1205 printf(" ipttl %u", cmd->arg1 ); 1206 else 1207 print_newports((ipfw_insn_u16 *)cmd, 0, 1208 O_IPTTL); 1209 break; 1210 1211 case O_IPVER: 1212 printf(" ipver %u", cmd->arg1 ); 1213 break; 1214 1215 case O_IPPRECEDENCE: 1216 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1217 break; 1218 1219 case O_IPLEN: 1220 if (F_LEN(cmd) == 1) 1221 printf(" iplen %u", cmd->arg1 ); 1222 else 1223 print_newports((ipfw_insn_u16 *)cmd, 0, 1224 O_IPLEN); 1225 break; 1226 1227 case O_IPOPT: 1228 print_flags("ipoptions", cmd, f_ipopts); 1229 break; 1230 1231 case O_IPTOS: 1232 print_flags("iptos", cmd, f_iptos); 1233 break; 1234 1235 case O_ICMPTYPE: 1236 print_icmptypes((ipfw_insn_u32 *)cmd); 1237 break; 1238 1239 case O_ESTAB: 1240 printf(" established"); 1241 break; 1242 1243 case O_TCPFLAGS: 1244 print_flags("tcpflags", cmd, f_tcpflags); 1245 break; 1246 1247 case O_TCPOPTS: 1248 print_flags("tcpoptions", cmd, f_tcpopts); 1249 break; 1250 1251 case O_TCPWIN: 1252 printf(" tcpwin %d", ntohs(cmd->arg1)); 1253 break; 1254 1255 case O_TCPACK: 1256 printf(" tcpack %d", ntohl(cmd32->d[0])); 1257 break; 1258 1259 case O_TCPSEQ: 1260 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1261 break; 1262 1263 case O_UID: 1264 { 1265 struct passwd *pwd = getpwuid(cmd32->d[0]); 1266 1267 if (pwd) 1268 printf(" uid %s", pwd->pw_name); 1269 else 1270 printf(" uid %u", cmd32->d[0]); 1271 } 1272 break; 1273 1274 case O_GID: 1275 { 1276 struct group *grp = getgrgid(cmd32->d[0]); 1277 1278 if (grp) 1279 printf(" gid %s", grp->gr_name); 1280 else 1281 printf(" gid %u", cmd32->d[0]); 1282 } 1283 break; 1284 1285 case O_VERREVPATH: 1286 printf(" verrevpath"); 1287 break; 1288 1289 case O_VERSRCREACH: 1290 printf(" versrcreach"); 1291 break; 1292 1293 case O_IPSEC: 1294 printf(" ipsec"); 1295 break; 1296 1297 case O_NOP: 1298 comment = (char *)(cmd + 1); 1299 break; 1300 1301 case O_KEEP_STATE: 1302 printf(" keep-state"); 1303 break; 1304 1305 case O_LIMIT: 1306 { 1307 struct _s_x *p = limit_masks; 1308 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1309 uint8_t x = c->limit_mask; 1310 char const *comma = " "; 1311 1312 printf(" limit"); 1313 for (; p->x != 0 ; p++) 1314 if ((x & p->x) == p->x) { 1315 x &= ~p->x; 1316 printf("%s%s", comma, p->s); 1317 comma = ","; 1318 } 1319 printf(" %d", c->conn_limit); 1320 } 1321 break; 1322 1323 default: 1324 printf(" [opcode %d len %d]", 1325 cmd->opcode, cmd->len); 1326 } 1327 } 1328 if (cmd->len & F_OR) { 1329 printf(" or"); 1330 or_block = 1; 1331 } else if (or_block) { 1332 printf(" }"); 1333 or_block = 0; 1334 } 1335 } 1336 show_prerequisites(&flags, HAVE_IP, 0); 1337 if (comment) 1338 printf(" // %s", comment); 1339 printf("\n"); 1340 } 1341 1342 static void 1343 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1344 { 1345 struct protoent *pe; 1346 struct in_addr a; 1347 uint16_t rulenum; 1348 1349 if (!do_expired) { 1350 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1351 return; 1352 } 1353 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1354 printf("%05d", rulenum); 1355 if (pcwidth>0 || bcwidth>0) 1356 printf(" %*llu %*llu (%ds)", pcwidth, 1357 align_uint64(&d->pcnt), bcwidth, 1358 align_uint64(&d->bcnt), d->expire); 1359 switch (d->dyn_type) { 1360 case O_LIMIT_PARENT: 1361 printf(" PARENT %d", d->count); 1362 break; 1363 case O_LIMIT: 1364 printf(" LIMIT"); 1365 break; 1366 case O_KEEP_STATE: /* bidir, no mask */ 1367 printf(" STATE"); 1368 break; 1369 } 1370 1371 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1372 printf(" %s", pe->p_name); 1373 else 1374 printf(" proto %u", d->id.proto); 1375 1376 a.s_addr = htonl(d->id.src_ip); 1377 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1378 1379 a.s_addr = htonl(d->id.dst_ip); 1380 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1381 printf("\n"); 1382 } 1383 1384 static int 1385 sort_q(const void *pa, const void *pb) 1386 { 1387 int rev = (do_sort < 0); 1388 int field = rev ? -do_sort : do_sort; 1389 long long res = 0; 1390 const struct dn_flow_queue *a = pa; 1391 const struct dn_flow_queue *b = pb; 1392 1393 switch (field) { 1394 case 1: /* pkts */ 1395 res = a->len - b->len; 1396 break; 1397 case 2: /* bytes */ 1398 res = a->len_bytes - b->len_bytes; 1399 break; 1400 1401 case 3: /* tot pkts */ 1402 res = a->tot_pkts - b->tot_pkts; 1403 break; 1404 1405 case 4: /* tot bytes */ 1406 res = a->tot_bytes - b->tot_bytes; 1407 break; 1408 } 1409 if (res < 0) 1410 res = -1; 1411 if (res > 0) 1412 res = 1; 1413 return (int)(rev ? res : -res); 1414 } 1415 1416 static void 1417 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1418 { 1419 int l; 1420 1421 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1422 fs->flow_mask.proto, 1423 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1424 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1425 if (fs->rq_elements == 0) 1426 return; 1427 1428 printf("BKT Prot ___Source IP/port____ " 1429 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1430 if (do_sort != 0) 1431 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1432 for (l = 0; l < fs->rq_elements; l++) { 1433 struct in_addr ina; 1434 struct protoent *pe; 1435 1436 ina.s_addr = htonl(q[l].id.src_ip); 1437 printf("%3d ", q[l].hash_slot); 1438 pe = getprotobynumber(q[l].id.proto); 1439 if (pe) 1440 printf("%-4s ", pe->p_name); 1441 else 1442 printf("%4u ", q[l].id.proto); 1443 printf("%15s/%-5d ", 1444 inet_ntoa(ina), q[l].id.src_port); 1445 ina.s_addr = htonl(q[l].id.dst_ip); 1446 printf("%15s/%-5d ", 1447 inet_ntoa(ina), q[l].id.dst_port); 1448 printf("%4qu %8qu %2u %4u %3u\n", 1449 q[l].tot_pkts, q[l].tot_bytes, 1450 q[l].len, q[l].len_bytes, q[l].drops); 1451 if (verbose) 1452 printf(" S %20qd F %20qd\n", 1453 q[l].S, q[l].F); 1454 } 1455 } 1456 1457 static void 1458 print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1459 { 1460 int l; 1461 char qs[30]; 1462 char plr[30]; 1463 char red[90]; /* Display RED parameters */ 1464 1465 l = fs->qsize; 1466 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1467 if (l >= 8192) 1468 sprintf(qs, "%d KB", l / 1024); 1469 else 1470 sprintf(qs, "%d B", l); 1471 } else 1472 sprintf(qs, "%3d sl.", l); 1473 if (fs->plr) 1474 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1475 else 1476 plr[0] = '\0'; 1477 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1478 sprintf(red, 1479 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1480 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1481 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1482 SCALE_VAL(fs->min_th), 1483 SCALE_VAL(fs->max_th), 1484 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1485 else 1486 sprintf(red, "droptail"); 1487 1488 printf("%s %s%s %d queues (%d buckets) %s\n", 1489 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1490 } 1491 1492 static void 1493 list_pipes(void *data, uint nbytes, int ac, char *av[]) 1494 { 1495 int rulenum; 1496 void *next = data; 1497 struct dn_pipe *p = (struct dn_pipe *) data; 1498 struct dn_flow_set *fs; 1499 struct dn_flow_queue *q; 1500 int l; 1501 1502 if (ac > 0) 1503 rulenum = strtoul(*av++, NULL, 10); 1504 else 1505 rulenum = 0; 1506 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1507 double b = p->bandwidth; 1508 char buf[30]; 1509 char prefix[80]; 1510 1511 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1512 break; /* done with pipes, now queues */ 1513 1514 /* 1515 * compute length, as pipe have variable size 1516 */ 1517 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1518 next = (char *)p + l; 1519 nbytes -= l; 1520 1521 if (rulenum != 0 && rulenum != p->pipe_nr) 1522 continue; 1523 1524 /* 1525 * Print rate (or clocking interface) 1526 */ 1527 if (p->if_name[0] != '\0') 1528 sprintf(buf, "%s", p->if_name); 1529 else if (b == 0) 1530 sprintf(buf, "unlimited"); 1531 else if (b >= 1000000) 1532 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1533 else if (b >= 1000) 1534 sprintf(buf, "%7.3f Kbit/s", b/1000); 1535 else 1536 sprintf(buf, "%7.3f bit/s ", b); 1537 1538 sprintf(prefix, "%05d: %s %4d ms ", 1539 p->pipe_nr, buf, p->delay); 1540 print_flowset_parms(&(p->fs), prefix); 1541 if (verbose) 1542 printf(" V %20qd\n", p->V >> MY_M); 1543 1544 q = (struct dn_flow_queue *)(p+1); 1545 list_queues(&(p->fs), q); 1546 } 1547 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1548 char prefix[80]; 1549 1550 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1551 break; 1552 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1553 next = (char *)fs + l; 1554 nbytes -= l; 1555 q = (struct dn_flow_queue *)(fs+1); 1556 sprintf(prefix, "q%05d: weight %d pipe %d ", 1557 fs->fs_nr, fs->weight, fs->parent_nr); 1558 print_flowset_parms(fs, prefix); 1559 list_queues(fs, q); 1560 } 1561 } 1562 1563 /* 1564 * This one handles all set-related commands 1565 * ipfw set { show | enable | disable } 1566 * ipfw set swap X Y 1567 * ipfw set move X to Y 1568 * ipfw set move rule X to Y 1569 */ 1570 static void 1571 sets_handler(int ac, char *av[]) 1572 { 1573 uint32_t set_disable, masks[2]; 1574 int i, nbytes; 1575 uint16_t rulenum; 1576 uint8_t cmd, new_set; 1577 1578 ac--; 1579 av++; 1580 1581 if (!ac) 1582 errx(EX_USAGE, "set needs command"); 1583 if (!strncmp(*av, "show", strlen(*av)) ) { 1584 void *data; 1585 char const *msg; 1586 1587 nbytes = sizeof(struct ip_fw); 1588 if ((data = calloc(1, nbytes)) == NULL) 1589 err(EX_OSERR, "calloc"); 1590 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1591 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1592 bcopy(&((struct ip_fw *)data)->next_rule, 1593 &set_disable, sizeof(set_disable)); 1594 1595 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1596 if ((set_disable & (1<<i))) { 1597 printf("%s %d", msg, i); 1598 msg = ""; 1599 } 1600 msg = (set_disable) ? " enable" : "enable"; 1601 for (i = 0; i < RESVD_SET; i++) 1602 if (!(set_disable & (1<<i))) { 1603 printf("%s %d", msg, i); 1604 msg = ""; 1605 } 1606 printf("\n"); 1607 } else if (!strncmp(*av, "swap", strlen(*av))) { 1608 ac--; av++; 1609 if (ac != 2) 1610 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1611 rulenum = atoi(av[0]); 1612 new_set = atoi(av[1]); 1613 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1614 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1615 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1616 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1617 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1618 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1619 } else if (!strncmp(*av, "move", strlen(*av))) { 1620 ac--; av++; 1621 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1622 cmd = 2; 1623 ac--; av++; 1624 } else 1625 cmd = 3; 1626 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1627 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1628 rulenum = atoi(av[0]); 1629 new_set = atoi(av[2]); 1630 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1631 (cmd == 2 && rulenum == 65535) ) 1632 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1633 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1634 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1635 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1636 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1637 } else if (!strncmp(*av, "disable", strlen(*av)) || 1638 !strncmp(*av, "enable", strlen(*av)) ) { 1639 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1640 1641 ac--; av++; 1642 masks[0] = masks[1] = 0; 1643 1644 while (ac) { 1645 if (isdigit(**av)) { 1646 i = atoi(*av); 1647 if (i < 0 || i > RESVD_SET) 1648 errx(EX_DATAERR, 1649 "invalid set number %d\n", i); 1650 masks[which] |= (1<<i); 1651 } else if (!strncmp(*av, "disable", strlen(*av))) 1652 which = 0; 1653 else if (!strncmp(*av, "enable", strlen(*av))) 1654 which = 1; 1655 else 1656 errx(EX_DATAERR, 1657 "invalid set command %s\n", *av); 1658 av++; ac--; 1659 } 1660 if ( (masks[0] & masks[1]) != 0 ) 1661 errx(EX_DATAERR, 1662 "cannot enable and disable the same set\n"); 1663 1664 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1665 if (i) 1666 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1667 } else 1668 errx(EX_USAGE, "invalid set command %s\n", *av); 1669 } 1670 1671 static void 1672 sysctl_handler(int ac, char *av[], int which) 1673 { 1674 ac--; 1675 av++; 1676 1677 if (ac == 0) { 1678 warnx("missing keyword to enable/disable\n"); 1679 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1680 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1681 &which, sizeof(which)); 1682 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1683 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1684 &which, sizeof(which)); 1685 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1686 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1687 &which, sizeof(which)); 1688 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1689 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1690 &which, sizeof(which)); 1691 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1692 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1693 &which, sizeof(which)); 1694 } else { 1695 warnx("unrecognize enable/disable keyword: %s\n", *av); 1696 } 1697 } 1698 1699 static void 1700 list(int ac, char *av[], int show_counters) 1701 { 1702 struct ip_fw *r; 1703 ipfw_dyn_rule *dynrules, *d; 1704 1705 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1706 char *lim; 1707 void *data = NULL; 1708 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1709 int exitval = EX_OK; 1710 int lac; 1711 char **lav; 1712 u_long rnum, last; 1713 char *endptr; 1714 int seen = 0; 1715 1716 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1717 int nalloc = 1024; /* start somewhere... */ 1718 1719 if (test_only) { 1720 fprintf(stderr, "Testing only, list disabled\n"); 1721 return; 1722 } 1723 1724 ac--; 1725 av++; 1726 1727 /* get rules or pipes from kernel, resizing array as necessary */ 1728 nbytes = nalloc; 1729 1730 while (nbytes >= nalloc) { 1731 nalloc = nalloc * 2 + 200; 1732 nbytes = nalloc; 1733 if ((data = realloc(data, nbytes)) == NULL) 1734 err(EX_OSERR, "realloc"); 1735 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1736 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1737 do_pipe ? "DUMMYNET" : "FW"); 1738 } 1739 1740 if (do_pipe) { 1741 list_pipes(data, nbytes, ac, av); 1742 goto done; 1743 } 1744 1745 /* 1746 * Count static rules. They have variable size so we 1747 * need to scan the list to count them. 1748 */ 1749 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1750 r->rulenum < 65535 && (char *)r < lim; 1751 ++nstat, r = NEXT(r) ) 1752 ; /* nothing */ 1753 1754 /* 1755 * Count dynamic rules. This is easier as they have 1756 * fixed size. 1757 */ 1758 r = NEXT(r); 1759 dynrules = (ipfw_dyn_rule *)r ; 1760 n = (char *)r - (char *)data; 1761 ndyn = (nbytes - n) / sizeof *dynrules; 1762 1763 /* if showing stats, figure out column widths ahead of time */ 1764 bcwidth = pcwidth = 0; 1765 if (show_counters) { 1766 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1767 /* packet counter */ 1768 width = snprintf(NULL, 0, "%llu", 1769 align_uint64(&r->pcnt)); 1770 if (width > pcwidth) 1771 pcwidth = width; 1772 1773 /* byte counter */ 1774 width = snprintf(NULL, 0, "%llu", 1775 align_uint64(&r->bcnt)); 1776 if (width > bcwidth) 1777 bcwidth = width; 1778 } 1779 } 1780 if (do_dynamic && ndyn) { 1781 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1782 width = snprintf(NULL, 0, "%llu", 1783 align_uint64(&d->pcnt)); 1784 if (width > pcwidth) 1785 pcwidth = width; 1786 1787 width = snprintf(NULL, 0, "%llu", 1788 align_uint64(&d->bcnt)); 1789 if (width > bcwidth) 1790 bcwidth = width; 1791 } 1792 } 1793 /* if no rule numbers were specified, list all rules */ 1794 if (ac == 0) { 1795 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1796 show_ipfw(r, pcwidth, bcwidth); 1797 1798 if (do_dynamic && ndyn) { 1799 printf("## Dynamic rules (%d):\n", ndyn); 1800 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1801 show_dyn_ipfw(d, pcwidth, bcwidth); 1802 } 1803 goto done; 1804 } 1805 1806 /* display specific rules requested on command line */ 1807 1808 for (lac = ac, lav = av; lac != 0; lac--) { 1809 /* convert command line rule # */ 1810 last = rnum = strtoul(*lav++, &endptr, 10); 1811 if (*endptr == '-') 1812 last = strtoul(endptr+1, &endptr, 10); 1813 if (*endptr) { 1814 exitval = EX_USAGE; 1815 warnx("invalid rule number: %s", *(lav - 1)); 1816 continue; 1817 } 1818 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1819 if (r->rulenum > last) 1820 break; 1821 if (r->rulenum >= rnum && r->rulenum <= last) { 1822 show_ipfw(r, pcwidth, bcwidth); 1823 seen = 1; 1824 } 1825 } 1826 if (!seen) { 1827 /* give precedence to other error(s) */ 1828 if (exitval == EX_OK) 1829 exitval = EX_UNAVAILABLE; 1830 warnx("rule %lu does not exist", rnum); 1831 } 1832 } 1833 1834 if (do_dynamic && ndyn) { 1835 printf("## Dynamic rules:\n"); 1836 for (lac = ac, lav = av; lac != 0; lac--) { 1837 rnum = strtoul(*lav++, &endptr, 10); 1838 if (*endptr == '-') 1839 last = strtoul(endptr+1, &endptr, 10); 1840 if (*endptr) 1841 /* already warned */ 1842 continue; 1843 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1844 uint16_t rulenum; 1845 1846 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1847 if (rulenum > rnum) 1848 break; 1849 if (r->rulenum >= rnum && r->rulenum <= last) 1850 show_dyn_ipfw(d, pcwidth, bcwidth); 1851 } 1852 } 1853 } 1854 1855 ac = 0; 1856 1857 done: 1858 free(data); 1859 1860 if (exitval != EX_OK) 1861 exit(exitval); 1862 #undef NEXT 1863 } 1864 1865 static void 1866 show_usage(void) 1867 { 1868 fprintf(stderr, "usage: ipfw [options]\n" 1869 "do \"ipfw -h\" or see ipfw manpage for details\n" 1870 ); 1871 exit(EX_USAGE); 1872 } 1873 1874 static void 1875 help(void) 1876 { 1877 fprintf(stderr, 1878 "ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1879 "ipfw [-abcdefhnNqStTv] <command> where <command> is one of:\n" 1880 "add [num] [set N] [prob x] RULE-BODY\n" 1881 "{pipe|queue} N config PIPE-BODY\n" 1882 "[pipe|queue] {zero|delete|show} [N{,N}]\n" 1883 "set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1884 "table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" 1885 "\n" 1886 "RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1887 "ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1888 " {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1889 "ADDR: [ MAC dst src ether_type ] \n" 1890 " [ from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 1891 "IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" 1892 "IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 1893 "OPTION_LIST: OPTION [OPTION_LIST]\n" 1894 "OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1895 " estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1896 " iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1897 " ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1898 " mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1899 " setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1900 " verrevpath | versrcreach\n" 1901 ); 1902 exit(0); 1903 } 1904 1905 1906 static int 1907 lookup_host (char *host, struct in_addr *ipaddr) 1908 { 1909 struct hostent *he; 1910 1911 if (!inet_aton(host, ipaddr)) { 1912 if ((he = gethostbyname(host)) == NULL) 1913 return(-1); 1914 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1915 } 1916 return(0); 1917 } 1918 1919 /* 1920 * fills the addr and mask fields in the instruction as appropriate from av. 1921 * Update length as appropriate. 1922 * The following formats are allowed: 1923 * any matches any IP. Actually returns an empty instruction. 1924 * me returns O_IP_*_ME 1925 * 1.2.3.4 single IP address 1926 * 1.2.3.4:5.6.7.8 address:mask 1927 * 1.2.3.4/24 address/mask 1928 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1929 * We can have multiple comma-separated address/mask entries. 1930 */ 1931 static void 1932 fill_ip(ipfw_insn_ip *cmd, char *av) 1933 { 1934 int len = 0; 1935 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1936 1937 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1938 1939 if (!strncmp(av, "any", strlen(av))) 1940 return; 1941 1942 if (!strncmp(av, "me", strlen(av))) { 1943 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1944 return; 1945 } 1946 1947 if (!strncmp(av, "table(", 6)) { 1948 char *p = strchr(av + 6, ','); 1949 1950 if (p) 1951 *p++ = '\0'; 1952 cmd->o.opcode = O_IP_DST_LOOKUP; 1953 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 1954 if (p) { 1955 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 1956 d[0] = strtoul(p, NULL, 0); 1957 } else 1958 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1959 return; 1960 } 1961 1962 while (av) { 1963 /* 1964 * After the address we can have '/' or ':' indicating a mask, 1965 * ',' indicating another address follows, '{' indicating a 1966 * set of addresses of unspecified size. 1967 */ 1968 char *p = strpbrk(av, "/:,{"); 1969 int masklen; 1970 char md; 1971 1972 if (p) { 1973 md = *p; 1974 *p++ = '\0'; 1975 } else 1976 md = '\0'; 1977 1978 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1979 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1980 switch (md) { 1981 case ':': 1982 if (!inet_aton(p, (struct in_addr *)&d[1])) 1983 errx(EX_DATAERR, "bad netmask ``%s''", p); 1984 break; 1985 case '/': 1986 masklen = atoi(p); 1987 if (masklen == 0) 1988 d[1] = htonl(0); /* mask */ 1989 else if (masklen > 32) 1990 errx(EX_DATAERR, "bad width ``%s''", p); 1991 else 1992 d[1] = htonl(~0 << (32 - masklen)); 1993 break; 1994 case '{': /* no mask, assume /24 and put back the '{' */ 1995 d[1] = htonl(~0 << (32 - 24)); 1996 *(--p) = md; 1997 break; 1998 1999 case ',': /* single address plus continuation */ 2000 *(--p) = md; 2001 /* FALLTHROUGH */ 2002 case 0: /* initialization value */ 2003 default: 2004 d[1] = htonl(~0); /* force /32 */ 2005 break; 2006 } 2007 d[0] &= d[1]; /* mask base address with mask */ 2008 /* find next separator */ 2009 if (p) 2010 p = strpbrk(p, ",{"); 2011 if (p && *p == '{') { 2012 /* 2013 * We have a set of addresses. They are stored as follows: 2014 * arg1 is the set size (powers of 2, 2..256) 2015 * addr is the base address IN HOST FORMAT 2016 * mask.. is an array of arg1 bits (rounded up to 2017 * the next multiple of 32) with bits set 2018 * for each host in the map. 2019 */ 2020 uint32_t *map = (uint32_t *)&cmd->mask; 2021 int low, high; 2022 int i = contigmask((uint8_t *)&(d[1]), 32); 2023 2024 if (len > 0) 2025 errx(EX_DATAERR, "address set cannot be in a list"); 2026 if (i < 24 || i > 31) 2027 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2028 cmd->o.arg1 = 1<<(32-i); /* map length */ 2029 d[0] = ntohl(d[0]); /* base addr in host format */ 2030 cmd->o.opcode = O_IP_DST_SET; /* default */ 2031 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2032 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2033 map[i] = 0; /* clear map */ 2034 2035 av = p + 1; 2036 low = d[0] & 0xff; 2037 high = low + cmd->o.arg1 - 1; 2038 /* 2039 * Here, i stores the previous value when we specify a range 2040 * of addresses within a mask, e.g. 45-63. i = -1 means we 2041 * have no previous value. 2042 */ 2043 i = -1; /* previous value in a range */ 2044 while (isdigit(*av)) { 2045 char *s; 2046 int a = strtol(av, &s, 0); 2047 2048 if (s == av) { /* no parameter */ 2049 if (*av != '}') 2050 errx(EX_DATAERR, "set not closed\n"); 2051 if (i != -1) 2052 errx(EX_DATAERR, "incomplete range %d-", i); 2053 break; 2054 } 2055 if (a < low || a > high) 2056 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2057 a, low, high); 2058 a -= low; 2059 if (i == -1) /* no previous in range */ 2060 i = a; 2061 else { /* check that range is valid */ 2062 if (i > a) 2063 errx(EX_DATAERR, "invalid range %d-%d", 2064 i+low, a+low); 2065 if (*s == '-') 2066 errx(EX_DATAERR, "double '-' in range"); 2067 } 2068 for (; i <= a; i++) 2069 map[i/32] |= 1<<(i & 31); 2070 i = -1; 2071 if (*s == '-') 2072 i = a; 2073 else if (*s == '}') 2074 break; 2075 av = s+1; 2076 } 2077 return; 2078 } 2079 av = p; 2080 if (av) /* then *av must be a ',' */ 2081 av++; 2082 2083 /* Check this entry */ 2084 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2085 /* 2086 * 'any' turns the entire list into a NOP. 2087 * 'not any' never matches, so it is removed from the 2088 * list unless it is the only item, in which case we 2089 * report an error. 2090 */ 2091 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2092 if (av == NULL && len == 0) /* only this entry */ 2093 errx(EX_DATAERR, "not any never matches"); 2094 } 2095 /* else do nothing and skip this entry */ 2096 return; 2097 } 2098 /* A single IP can be stored in an optimized format */ 2099 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2100 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2101 return; 2102 } 2103 len += 2; /* two words... */ 2104 d += 2; 2105 } /* end while */ 2106 cmd->o.len |= len+1; 2107 } 2108 2109 2110 /* 2111 * helper function to process a set of flags and set bits in the 2112 * appropriate masks. 2113 */ 2114 static void 2115 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2116 struct _s_x *flags, char *p) 2117 { 2118 uint8_t set=0, clear=0; 2119 2120 while (p && *p) { 2121 char *q; /* points to the separator */ 2122 int val; 2123 uint8_t *which; /* mask we are working on */ 2124 2125 if (*p == '!') { 2126 p++; 2127 which = &clear; 2128 } else 2129 which = &set; 2130 q = strchr(p, ','); 2131 if (q) 2132 *q++ = '\0'; 2133 val = match_token(flags, p); 2134 if (val <= 0) 2135 errx(EX_DATAERR, "invalid flag %s", p); 2136 *which |= (uint8_t)val; 2137 p = q; 2138 } 2139 cmd->opcode = opcode; 2140 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2141 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2142 } 2143 2144 2145 static void 2146 delete(int ac, char *av[]) 2147 { 2148 uint32_t rulenum; 2149 struct dn_pipe p; 2150 int i; 2151 int exitval = EX_OK; 2152 int do_set = 0; 2153 2154 memset(&p, 0, sizeof p); 2155 2156 av++; ac--; 2157 NEED1("missing rule specification"); 2158 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2159 do_set = 1; /* delete set */ 2160 ac--; av++; 2161 } 2162 2163 /* Rule number */ 2164 while (ac && isdigit(**av)) { 2165 i = atoi(*av); av++; ac--; 2166 if (do_pipe) { 2167 if (do_pipe == 1) 2168 p.pipe_nr = i; 2169 else 2170 p.fs.fs_nr = i; 2171 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2172 if (i) { 2173 exitval = 1; 2174 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2175 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2176 } 2177 } else { 2178 rulenum = (i & 0xffff) | (do_set << 24); 2179 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2180 if (i) { 2181 exitval = EX_UNAVAILABLE; 2182 warn("rule %u: setsockopt(IP_FW_DEL)", 2183 rulenum); 2184 } 2185 } 2186 } 2187 if (exitval != EX_OK) 2188 exit(exitval); 2189 } 2190 2191 2192 /* 2193 * fill the interface structure. We do not check the name as we can 2194 * create interfaces dynamically, so checking them at insert time 2195 * makes relatively little sense. 2196 * Interface names containing '*', '?', or '[' are assumed to be shell 2197 * patterns which match interfaces. 2198 */ 2199 static void 2200 fill_iface(ipfw_insn_if *cmd, char *arg) 2201 { 2202 cmd->name[0] = '\0'; 2203 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2204 2205 /* Parse the interface or address */ 2206 if (!strcmp(arg, "any")) 2207 cmd->o.len = 0; /* effectively ignore this command */ 2208 else if (!isdigit(*arg)) { 2209 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2210 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2211 } else if (!inet_aton(arg, &cmd->p.ip)) 2212 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2213 } 2214 2215 static void 2216 config_pipe(int ac, char **av) 2217 { 2218 struct dn_pipe p; 2219 int i; 2220 char *end; 2221 uint32_t a; 2222 void *par = NULL; 2223 2224 memset(&p, 0, sizeof p); 2225 2226 av++; ac--; 2227 /* Pipe number */ 2228 if (ac && isdigit(**av)) { 2229 i = atoi(*av); av++; ac--; 2230 if (do_pipe == 1) 2231 p.pipe_nr = i; 2232 else 2233 p.fs.fs_nr = i; 2234 } 2235 while (ac > 0) { 2236 double d; 2237 int tok = match_token(dummynet_params, *av); 2238 ac--; av++; 2239 2240 switch(tok) { 2241 case TOK_NOERROR: 2242 p.fs.flags_fs |= DN_NOERROR; 2243 break; 2244 2245 case TOK_PLR: 2246 NEED1("plr needs argument 0..1\n"); 2247 d = strtod(av[0], NULL); 2248 if (d > 1) 2249 d = 1; 2250 else if (d < 0) 2251 d = 0; 2252 p.fs.plr = (int)(d*0x7fffffff); 2253 ac--; av++; 2254 break; 2255 2256 case TOK_QUEUE: 2257 NEED1("queue needs queue size\n"); 2258 end = NULL; 2259 p.fs.qsize = strtoul(av[0], &end, 0); 2260 if (*end == 'K' || *end == 'k') { 2261 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2262 p.fs.qsize *= 1024; 2263 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2264 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2265 } 2266 ac--; av++; 2267 break; 2268 2269 case TOK_BUCKETS: 2270 NEED1("buckets needs argument\n"); 2271 p.fs.rq_size = strtoul(av[0], NULL, 0); 2272 ac--; av++; 2273 break; 2274 2275 case TOK_MASK: 2276 NEED1("mask needs mask specifier\n"); 2277 /* 2278 * per-flow queue, mask is dst_ip, dst_port, 2279 * src_ip, src_port, proto measured in bits 2280 */ 2281 par = NULL; 2282 2283 p.fs.flow_mask.dst_ip = 0; 2284 p.fs.flow_mask.src_ip = 0; 2285 p.fs.flow_mask.dst_port = 0; 2286 p.fs.flow_mask.src_port = 0; 2287 p.fs.flow_mask.proto = 0; 2288 end = NULL; 2289 2290 while (ac >= 1) { 2291 uint32_t *p32 = NULL; 2292 uint16_t *p16 = NULL; 2293 2294 tok = match_token(dummynet_params, *av); 2295 ac--; av++; 2296 switch(tok) { 2297 case TOK_ALL: 2298 /* 2299 * special case, all bits significant 2300 */ 2301 p.fs.flow_mask.dst_ip = ~0; 2302 p.fs.flow_mask.src_ip = ~0; 2303 p.fs.flow_mask.dst_port = ~0; 2304 p.fs.flow_mask.src_port = ~0; 2305 p.fs.flow_mask.proto = ~0; 2306 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2307 goto end_mask; 2308 2309 case TOK_DSTIP: 2310 p32 = &p.fs.flow_mask.dst_ip; 2311 break; 2312 2313 case TOK_SRCIP: 2314 p32 = &p.fs.flow_mask.src_ip; 2315 break; 2316 2317 case TOK_DSTPORT: 2318 p16 = &p.fs.flow_mask.dst_port; 2319 break; 2320 2321 case TOK_SRCPORT: 2322 p16 = &p.fs.flow_mask.src_port; 2323 break; 2324 2325 case TOK_PROTO: 2326 break; 2327 2328 default: 2329 ac++; av--; /* backtrack */ 2330 goto end_mask; 2331 } 2332 if (ac < 1) 2333 errx(EX_USAGE, "mask: value missing"); 2334 if (*av[0] == '/') { 2335 a = strtoul(av[0]+1, &end, 0); 2336 a = (a == 32) ? ~0 : (1 << a) - 1; 2337 } else 2338 a = strtoul(av[0], &end, 0); 2339 if (p32 != NULL) 2340 *p32 = a; 2341 else if (p16 != NULL) { 2342 if (a > 65535) 2343 errx(EX_DATAERR, 2344 "mask: must be 16 bit"); 2345 *p16 = (uint16_t)a; 2346 } else { 2347 if (a > 255) 2348 errx(EX_DATAERR, 2349 "mask: must be 8 bit"); 2350 p.fs.flow_mask.proto = (uint8_t)a; 2351 } 2352 if (a != 0) 2353 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2354 ac--; av++; 2355 } /* end while, config masks */ 2356 end_mask: 2357 break; 2358 2359 case TOK_RED: 2360 case TOK_GRED: 2361 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2362 p.fs.flags_fs |= DN_IS_RED; 2363 if (tok == TOK_GRED) 2364 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2365 /* 2366 * the format for parameters is w_q/min_th/max_th/max_p 2367 */ 2368 if ((end = strsep(&av[0], "/"))) { 2369 double w_q = strtod(end, NULL); 2370 if (w_q > 1 || w_q <= 0) 2371 errx(EX_DATAERR, "0 < w_q <= 1"); 2372 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2373 } 2374 if ((end = strsep(&av[0], "/"))) { 2375 p.fs.min_th = strtoul(end, &end, 0); 2376 if (*end == 'K' || *end == 'k') 2377 p.fs.min_th *= 1024; 2378 } 2379 if ((end = strsep(&av[0], "/"))) { 2380 p.fs.max_th = strtoul(end, &end, 0); 2381 if (*end == 'K' || *end == 'k') 2382 p.fs.max_th *= 1024; 2383 } 2384 if ((end = strsep(&av[0], "/"))) { 2385 double max_p = strtod(end, NULL); 2386 if (max_p > 1 || max_p <= 0) 2387 errx(EX_DATAERR, "0 < max_p <= 1"); 2388 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2389 } 2390 ac--; av++; 2391 break; 2392 2393 case TOK_DROPTAIL: 2394 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2395 break; 2396 2397 case TOK_BW: 2398 NEED1("bw needs bandwidth or interface\n"); 2399 if (do_pipe != 1) 2400 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2401 /* 2402 * set clocking interface or bandwidth value 2403 */ 2404 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2405 int l = sizeof(p.if_name)-1; 2406 /* interface name */ 2407 strncpy(p.if_name, av[0], l); 2408 p.if_name[l] = '\0'; 2409 p.bandwidth = 0; 2410 } else { 2411 p.if_name[0] = '\0'; 2412 p.bandwidth = strtoul(av[0], &end, 0); 2413 if (*end == 'K' || *end == 'k') { 2414 end++; 2415 p.bandwidth *= 1000; 2416 } else if (*end == 'M') { 2417 end++; 2418 p.bandwidth *= 1000000; 2419 } 2420 if (*end == 'B' || !strncmp(end, "by", 2)) 2421 p.bandwidth *= 8; 2422 if (p.bandwidth < 0) 2423 errx(EX_DATAERR, "bandwidth too large"); 2424 } 2425 ac--; av++; 2426 break; 2427 2428 case TOK_DELAY: 2429 if (do_pipe != 1) 2430 errx(EX_DATAERR, "delay only valid for pipes"); 2431 NEED1("delay needs argument 0..10000ms\n"); 2432 p.delay = strtoul(av[0], NULL, 0); 2433 ac--; av++; 2434 break; 2435 2436 case TOK_WEIGHT: 2437 if (do_pipe == 1) 2438 errx(EX_DATAERR,"weight only valid for queues"); 2439 NEED1("weight needs argument 0..100\n"); 2440 p.fs.weight = strtoul(av[0], &end, 0); 2441 ac--; av++; 2442 break; 2443 2444 case TOK_PIPE: 2445 if (do_pipe == 1) 2446 errx(EX_DATAERR,"pipe only valid for queues"); 2447 NEED1("pipe needs pipe_number\n"); 2448 p.fs.parent_nr = strtoul(av[0], &end, 0); 2449 ac--; av++; 2450 break; 2451 2452 default: 2453 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 2454 } 2455 } 2456 if (do_pipe == 1) { 2457 if (p.pipe_nr == 0) 2458 errx(EX_DATAERR, "pipe_nr must be > 0"); 2459 if (p.delay > 10000) 2460 errx(EX_DATAERR, "delay must be < 10000"); 2461 } else { /* do_pipe == 2, queue */ 2462 if (p.fs.parent_nr == 0) 2463 errx(EX_DATAERR, "pipe must be > 0"); 2464 if (p.fs.weight >100) 2465 errx(EX_DATAERR, "weight must be <= 100"); 2466 } 2467 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2468 if (p.fs.qsize > 1024*1024) 2469 errx(EX_DATAERR, "queue size must be < 1MB"); 2470 } else { 2471 if (p.fs.qsize > 100) 2472 errx(EX_DATAERR, "2 <= queue size <= 100"); 2473 } 2474 if (p.fs.flags_fs & DN_IS_RED) { 2475 size_t len; 2476 int lookup_depth, avg_pkt_size; 2477 double s, idle, weight, w_q; 2478 struct clockinfo ck; 2479 int t; 2480 2481 if (p.fs.min_th >= p.fs.max_th) 2482 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2483 p.fs.min_th, p.fs.max_th); 2484 if (p.fs.max_th == 0) 2485 errx(EX_DATAERR, "max_th must be > 0"); 2486 2487 len = sizeof(int); 2488 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2489 &lookup_depth, &len, NULL, 0) == -1) 2490 2491 errx(1, "sysctlbyname(\"%s\")", 2492 "net.inet.ip.dummynet.red_lookup_depth"); 2493 if (lookup_depth == 0) 2494 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2495 " must be greater than zero"); 2496 2497 len = sizeof(int); 2498 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2499 &avg_pkt_size, &len, NULL, 0) == -1) 2500 2501 errx(1, "sysctlbyname(\"%s\")", 2502 "net.inet.ip.dummynet.red_avg_pkt_size"); 2503 if (avg_pkt_size == 0) 2504 errx(EX_DATAERR, 2505 "net.inet.ip.dummynet.red_avg_pkt_size must" 2506 " be greater than zero"); 2507 2508 len = sizeof(struct clockinfo); 2509 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2510 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2511 2512 /* 2513 * Ticks needed for sending a medium-sized packet. 2514 * Unfortunately, when we are configuring a WF2Q+ queue, we 2515 * do not have bandwidth information, because that is stored 2516 * in the parent pipe, and also we have multiple queues 2517 * competing for it. So we set s=0, which is not very 2518 * correct. But on the other hand, why do we want RED with 2519 * WF2Q+ ? 2520 */ 2521 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2522 s = 0; 2523 else 2524 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2525 2526 /* 2527 * max idle time (in ticks) before avg queue size becomes 0. 2528 * NOTA: (3/w_q) is approx the value x so that 2529 * (1-w_q)^x < 10^-3. 2530 */ 2531 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2532 idle = s * 3. / w_q; 2533 p.fs.lookup_step = (int)idle / lookup_depth; 2534 if (!p.fs.lookup_step) 2535 p.fs.lookup_step = 1; 2536 weight = 1 - w_q; 2537 for (t = p.fs.lookup_step; t > 0; --t) 2538 weight *= weight; 2539 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2540 } 2541 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2542 if (i) 2543 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2544 } 2545 2546 static void 2547 get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) 2548 { 2549 int i, l; 2550 2551 for (i=0; i<6; i++) 2552 addr[i] = mask[i] = 0; 2553 if (!strcmp(p, "any")) 2554 return; 2555 2556 for (i=0; *p && i<6;i++, p++) { 2557 addr[i] = strtol(p, &p, 16); 2558 if (*p != ':') /* we start with the mask */ 2559 break; 2560 } 2561 if (*p == '/') { /* mask len */ 2562 l = strtol(p+1, &p, 0); 2563 for (i=0; l>0; l -=8, i++) 2564 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2565 } else if (*p == '&') { /* mask */ 2566 for (i=0, p++; *p && i<6;i++, p++) { 2567 mask[i] = strtol(p, &p, 16); 2568 if (*p != ':') 2569 break; 2570 } 2571 } else if (*p == '\0') { 2572 for (i=0; i<6; i++) 2573 mask[i] = 0xff; 2574 } 2575 for (i=0; i<6; i++) 2576 addr[i] &= mask[i]; 2577 } 2578 2579 /* 2580 * helper function, updates the pointer to cmd with the length 2581 * of the current command, and also cleans up the first word of 2582 * the new command in case it has been clobbered before. 2583 */ 2584 static ipfw_insn * 2585 next_cmd(ipfw_insn *cmd) 2586 { 2587 cmd += F_LEN(cmd); 2588 bzero(cmd, sizeof(*cmd)); 2589 return cmd; 2590 } 2591 2592 /* 2593 * Takes arguments and copies them into a comment 2594 */ 2595 static void 2596 fill_comment(ipfw_insn *cmd, int ac, char **av) 2597 { 2598 int i, l; 2599 char *p = (char *)(cmd + 1); 2600 2601 cmd->opcode = O_NOP; 2602 cmd->len = (cmd->len & (F_NOT | F_OR)); 2603 2604 /* Compute length of comment string. */ 2605 for (i = 0, l = 0; i < ac; i++) 2606 l += strlen(av[i]) + 1; 2607 if (l == 0) 2608 return; 2609 if (l > 84) 2610 errx(EX_DATAERR, 2611 "comment too long (max 80 chars)"); 2612 l = 1 + (l+3)/4; 2613 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2614 for (i = 0; i < ac; i++) { 2615 strcpy(p, av[i]); 2616 p += strlen(av[i]); 2617 *p++ = ' '; 2618 } 2619 *(--p) = '\0'; 2620 } 2621 2622 /* 2623 * A function to fill simple commands of size 1. 2624 * Existing flags are preserved. 2625 */ 2626 static void 2627 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2628 { 2629 cmd->opcode = opcode; 2630 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2631 cmd->arg1 = arg; 2632 } 2633 2634 /* 2635 * Fetch and add the MAC address and type, with masks. This generates one or 2636 * two microinstructions, and returns the pointer to the last one. 2637 */ 2638 static ipfw_insn * 2639 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2640 { 2641 ipfw_insn_mac *mac; 2642 2643 if (ac < 2) 2644 errx(EX_DATAERR, "MAC dst src"); 2645 2646 cmd->opcode = O_MACADDR2; 2647 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2648 2649 mac = (ipfw_insn_mac *)cmd; 2650 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2651 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2652 return cmd; 2653 } 2654 2655 static ipfw_insn * 2656 add_mactype(ipfw_insn *cmd, int ac, char *av) 2657 { 2658 if (ac < 1) 2659 errx(EX_DATAERR, "missing MAC type"); 2660 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2661 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2662 cmd->opcode = O_MAC_TYPE; 2663 return cmd; 2664 } else 2665 return NULL; 2666 } 2667 2668 static ipfw_insn * 2669 add_proto(ipfw_insn *cmd, char *av) 2670 { 2671 struct protoent *pe; 2672 u_char proto = 0; 2673 2674 if (!strncmp(av, "all", strlen(av))) 2675 ; /* same as "ip" */ 2676 else if ((proto = atoi(av)) > 0) 2677 ; /* all done! */ 2678 else if ((pe = getprotobyname(av)) != NULL) 2679 proto = pe->p_proto; 2680 else 2681 return NULL; 2682 if (proto != IPPROTO_IP) 2683 fill_cmd(cmd, O_PROTO, 0, proto); 2684 return cmd; 2685 } 2686 2687 static ipfw_insn * 2688 add_srcip(ipfw_insn *cmd, char *av) 2689 { 2690 fill_ip((ipfw_insn_ip *)cmd, av); 2691 if (cmd->opcode == O_IP_DST_SET) /* set */ 2692 cmd->opcode = O_IP_SRC_SET; 2693 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2694 cmd->opcode = O_IP_SRC_LOOKUP; 2695 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2696 cmd->opcode = O_IP_SRC_ME; 2697 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2698 cmd->opcode = O_IP_SRC; 2699 else /* addr/mask */ 2700 cmd->opcode = O_IP_SRC_MASK; 2701 return cmd; 2702 } 2703 2704 static ipfw_insn * 2705 add_dstip(ipfw_insn *cmd, char *av) 2706 { 2707 fill_ip((ipfw_insn_ip *)cmd, av); 2708 if (cmd->opcode == O_IP_DST_SET) /* set */ 2709 ; 2710 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 2711 ; 2712 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2713 cmd->opcode = O_IP_DST_ME; 2714 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2715 cmd->opcode = O_IP_DST; 2716 else /* addr/mask */ 2717 cmd->opcode = O_IP_DST_MASK; 2718 return cmd; 2719 } 2720 2721 static ipfw_insn * 2722 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2723 { 2724 if (!strncmp(av, "any", strlen(av))) { 2725 return NULL; 2726 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2727 /* XXX todo: check that we have a protocol with ports */ 2728 cmd->opcode = opcode; 2729 return cmd; 2730 } 2731 return NULL; 2732 } 2733 2734 /* 2735 * Parse arguments and assemble the microinstructions which make up a rule. 2736 * Rules are added into the 'rulebuf' and then copied in the correct order 2737 * into the actual rule. 2738 * 2739 * The syntax for a rule starts with the action, followed by an 2740 * optional log action, and the various match patterns. 2741 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2742 * (generated if the rule includes a keep-state option), then the 2743 * various match patterns, the "log" action, and the actual action. 2744 * 2745 */ 2746 static void 2747 add(int ac, char *av[]) 2748 { 2749 /* 2750 * rules are added into the 'rulebuf' and then copied in 2751 * the correct order into the actual rule. 2752 * Some things that need to go out of order (prob, action etc.) 2753 * go into actbuf[]. 2754 */ 2755 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2756 2757 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2758 ipfw_insn *first_cmd; /* first match pattern */ 2759 2760 struct ip_fw *rule; 2761 2762 /* 2763 * various flags used to record that we entered some fields. 2764 */ 2765 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2766 2767 int i; 2768 2769 int open_par = 0; /* open parenthesis ( */ 2770 2771 /* proto is here because it is used to fetch ports */ 2772 u_char proto = IPPROTO_IP; /* default protocol */ 2773 2774 double match_prob = 1; /* match probability, default is always match */ 2775 2776 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2777 bzero(cmdbuf, sizeof(cmdbuf)); 2778 bzero(rulebuf, sizeof(rulebuf)); 2779 2780 rule = (struct ip_fw *)rulebuf; 2781 cmd = (ipfw_insn *)cmdbuf; 2782 action = (ipfw_insn *)actbuf; 2783 2784 av++; ac--; 2785 2786 /* [rule N] -- Rule number optional */ 2787 if (ac && isdigit(**av)) { 2788 rule->rulenum = atoi(*av); 2789 av++; 2790 ac--; 2791 } 2792 2793 /* [set N] -- set number (0..RESVD_SET), optional */ 2794 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2795 int set = strtoul(av[1], NULL, 10); 2796 if (set < 0 || set > RESVD_SET) 2797 errx(EX_DATAERR, "illegal set %s", av[1]); 2798 rule->set = set; 2799 av += 2; ac -= 2; 2800 } 2801 2802 /* [prob D] -- match probability, optional */ 2803 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2804 match_prob = strtod(av[1], NULL); 2805 2806 if (match_prob <= 0 || match_prob > 1) 2807 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2808 av += 2; ac -= 2; 2809 } 2810 2811 /* action -- mandatory */ 2812 NEED1("missing action"); 2813 i = match_token(rule_actions, *av); 2814 ac--; av++; 2815 action->len = 1; /* default */ 2816 switch(i) { 2817 case TOK_CHECKSTATE: 2818 have_state = action; 2819 action->opcode = O_CHECK_STATE; 2820 break; 2821 2822 case TOK_ACCEPT: 2823 action->opcode = O_ACCEPT; 2824 break; 2825 2826 case TOK_DENY: 2827 action->opcode = O_DENY; 2828 action->arg1 = 0; 2829 break; 2830 2831 case TOK_REJECT: 2832 action->opcode = O_REJECT; 2833 action->arg1 = ICMP_UNREACH_HOST; 2834 break; 2835 2836 case TOK_RESET: 2837 action->opcode = O_REJECT; 2838 action->arg1 = ICMP_REJECT_RST; 2839 break; 2840 2841 case TOK_UNREACH: 2842 action->opcode = O_REJECT; 2843 NEED1("missing reject code"); 2844 fill_reject_code(&action->arg1, *av); 2845 ac--; av++; 2846 break; 2847 2848 case TOK_COUNT: 2849 action->opcode = O_COUNT; 2850 break; 2851 2852 case TOK_QUEUE: 2853 case TOK_PIPE: 2854 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2855 case TOK_SKIPTO: 2856 if (i == TOK_QUEUE) 2857 action->opcode = O_QUEUE; 2858 else if (i == TOK_PIPE) 2859 action->opcode = O_PIPE; 2860 else if (i == TOK_SKIPTO) 2861 action->opcode = O_SKIPTO; 2862 NEED1("missing skipto/pipe/queue number"); 2863 action->arg1 = strtoul(*av, NULL, 10); 2864 av++; ac--; 2865 break; 2866 2867 case TOK_DIVERT: 2868 case TOK_TEE: 2869 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2870 NEED1("missing divert/tee port"); 2871 action->arg1 = strtoul(*av, NULL, 0); 2872 if (action->arg1 == 0) { 2873 struct servent *s; 2874 setservent(1); 2875 s = getservbyname(av[0], "divert"); 2876 if (s != NULL) 2877 action->arg1 = ntohs(s->s_port); 2878 else 2879 errx(EX_DATAERR, "illegal divert/tee port"); 2880 } 2881 ac--; av++; 2882 break; 2883 2884 case TOK_FORWARD: { 2885 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2886 char *s, *end; 2887 2888 NEED1("missing forward address[:port]"); 2889 2890 action->opcode = O_FORWARD_IP; 2891 action->len = F_INSN_SIZE(ipfw_insn_sa); 2892 2893 p->sa.sin_len = sizeof(struct sockaddr_in); 2894 p->sa.sin_family = AF_INET; 2895 p->sa.sin_port = 0; 2896 /* 2897 * locate the address-port separator (':' or ',') 2898 */ 2899 s = strchr(*av, ':'); 2900 if (s == NULL) 2901 s = strchr(*av, ','); 2902 if (s != NULL) { 2903 *(s++) = '\0'; 2904 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2905 if (s == end) 2906 errx(EX_DATAERR, 2907 "illegal forwarding port ``%s''", s); 2908 p->sa.sin_port = (u_short)i; 2909 } 2910 lookup_host(*av, &(p->sa.sin_addr)); 2911 } 2912 ac--; av++; 2913 break; 2914 2915 case TOK_COMMENT: 2916 /* pretend it is a 'count' rule followed by the comment */ 2917 action->opcode = O_COUNT; 2918 ac++; av--; /* go back... */ 2919 break; 2920 2921 default: 2922 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2923 } 2924 action = next_cmd(action); 2925 2926 /* 2927 * [log [logamount N]] -- log, optional 2928 * 2929 * If exists, it goes first in the cmdbuf, but then it is 2930 * skipped in the copy section to the end of the buffer. 2931 */ 2932 if (ac && !strncmp(*av, "log", strlen(*av))) { 2933 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2934 int l; 2935 2936 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2937 cmd->opcode = O_LOG; 2938 av++; ac--; 2939 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2940 ac--; av++; 2941 NEED1("logamount requires argument"); 2942 l = atoi(*av); 2943 if (l < 0) 2944 errx(EX_DATAERR, "logamount must be positive"); 2945 c->max_log = l; 2946 ac--; av++; 2947 } 2948 cmd = next_cmd(cmd); 2949 } 2950 2951 if (have_state) /* must be a check-state, we are done */ 2952 goto done; 2953 2954 #define OR_START(target) \ 2955 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2956 if (open_par) \ 2957 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2958 prev = NULL; \ 2959 open_par = 1; \ 2960 if ( (av[0])[1] == '\0') { \ 2961 ac--; av++; \ 2962 } else \ 2963 (*av)++; \ 2964 } \ 2965 target: \ 2966 2967 2968 #define CLOSE_PAR \ 2969 if (open_par) { \ 2970 if (ac && ( \ 2971 !strncmp(*av, ")", strlen(*av)) || \ 2972 !strncmp(*av, "}", strlen(*av)) )) { \ 2973 prev = NULL; \ 2974 open_par = 0; \ 2975 ac--; av++; \ 2976 } else \ 2977 errx(EX_USAGE, "missing \")\"\n"); \ 2978 } 2979 2980 #define NOT_BLOCK \ 2981 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2982 if (cmd->len & F_NOT) \ 2983 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2984 cmd->len |= F_NOT; \ 2985 ac--; av++; \ 2986 } 2987 2988 #define OR_BLOCK(target) \ 2989 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2990 if (prev == NULL || open_par == 0) \ 2991 errx(EX_DATAERR, "invalid OR block"); \ 2992 prev->len |= F_OR; \ 2993 ac--; av++; \ 2994 goto target; \ 2995 } \ 2996 CLOSE_PAR; 2997 2998 first_cmd = cmd; 2999 3000 #if 0 3001 /* 3002 * MAC addresses, optional. 3003 * If we have this, we skip the part "proto from src to dst" 3004 * and jump straight to the option parsing. 3005 */ 3006 NOT_BLOCK; 3007 NEED1("missing protocol"); 3008 if (!strncmp(*av, "MAC", strlen(*av)) || 3009 !strncmp(*av, "mac", strlen(*av))) { 3010 ac--; av++; /* the "MAC" keyword */ 3011 add_mac(cmd, ac, av); /* exits in case of errors */ 3012 cmd = next_cmd(cmd); 3013 ac -= 2; av += 2; /* dst-mac and src-mac */ 3014 NOT_BLOCK; 3015 NEED1("missing mac type"); 3016 if (add_mactype(cmd, ac, av[0])) 3017 cmd = next_cmd(cmd); 3018 ac--; av++; /* any or mac-type */ 3019 goto read_options; 3020 } 3021 #endif 3022 3023 /* 3024 * protocol, mandatory 3025 */ 3026 OR_START(get_proto); 3027 NOT_BLOCK; 3028 NEED1("missing protocol"); 3029 if (add_proto(cmd, *av)) { 3030 av++; ac--; 3031 if (F_LEN(cmd) == 0) /* plain IP */ 3032 proto = 0; 3033 else { 3034 proto = cmd->arg1; 3035 prev = cmd; 3036 cmd = next_cmd(cmd); 3037 } 3038 } else if (first_cmd != cmd) { 3039 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3040 } else 3041 goto read_options; 3042 OR_BLOCK(get_proto); 3043 3044 /* 3045 * "from", mandatory 3046 */ 3047 if (!ac || strncmp(*av, "from", strlen(*av))) 3048 errx(EX_USAGE, "missing ``from''"); 3049 ac--; av++; 3050 3051 /* 3052 * source IP, mandatory 3053 */ 3054 OR_START(source_ip); 3055 NOT_BLOCK; /* optional "not" */ 3056 NEED1("missing source address"); 3057 if (add_srcip(cmd, *av)) { 3058 ac--; av++; 3059 if (F_LEN(cmd) != 0) { /* ! any */ 3060 prev = cmd; 3061 cmd = next_cmd(cmd); 3062 } 3063 } 3064 OR_BLOCK(source_ip); 3065 3066 /* 3067 * source ports, optional 3068 */ 3069 NOT_BLOCK; /* optional "not" */ 3070 if (ac) { 3071 if (!strncmp(*av, "any", strlen(*av)) || 3072 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3073 ac--; av++; 3074 if (F_LEN(cmd) != 0) 3075 cmd = next_cmd(cmd); 3076 } 3077 } 3078 3079 /* 3080 * "to", mandatory 3081 */ 3082 if (!ac || strncmp(*av, "to", strlen(*av))) 3083 errx(EX_USAGE, "missing ``to''"); 3084 av++; ac--; 3085 3086 /* 3087 * destination, mandatory 3088 */ 3089 OR_START(dest_ip); 3090 NOT_BLOCK; /* optional "not" */ 3091 NEED1("missing dst address"); 3092 if (add_dstip(cmd, *av)) { 3093 ac--; av++; 3094 if (F_LEN(cmd) != 0) { /* ! any */ 3095 prev = cmd; 3096 cmd = next_cmd(cmd); 3097 } 3098 } 3099 OR_BLOCK(dest_ip); 3100 3101 /* 3102 * dest. ports, optional 3103 */ 3104 NOT_BLOCK; /* optional "not" */ 3105 if (ac) { 3106 if (!strncmp(*av, "any", strlen(*av)) || 3107 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3108 ac--; av++; 3109 if (F_LEN(cmd) != 0) 3110 cmd = next_cmd(cmd); 3111 } 3112 } 3113 3114 read_options: 3115 if (ac && first_cmd == cmd) { 3116 /* 3117 * nothing specified so far, store in the rule to ease 3118 * printout later. 3119 */ 3120 rule->_pad = 1; 3121 } 3122 prev = NULL; 3123 while (ac) { 3124 char *s; 3125 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3126 3127 s = *av; 3128 cmd32 = (ipfw_insn_u32 *)cmd; 3129 3130 if (*s == '!') { /* alternate syntax for NOT */ 3131 if (cmd->len & F_NOT) 3132 errx(EX_USAGE, "double \"not\" not allowed\n"); 3133 cmd->len = F_NOT; 3134 s++; 3135 } 3136 i = match_token(rule_options, s); 3137 ac--; av++; 3138 switch(i) { 3139 case TOK_NOT: 3140 if (cmd->len & F_NOT) 3141 errx(EX_USAGE, "double \"not\" not allowed\n"); 3142 cmd->len = F_NOT; 3143 break; 3144 3145 case TOK_OR: 3146 if (open_par == 0 || prev == NULL) 3147 errx(EX_USAGE, "invalid \"or\" block\n"); 3148 prev->len |= F_OR; 3149 break; 3150 3151 case TOK_STARTBRACE: 3152 if (open_par) 3153 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3154 open_par = 1; 3155 break; 3156 3157 case TOK_ENDBRACE: 3158 if (!open_par) 3159 errx(EX_USAGE, "+missing \")\"\n"); 3160 open_par = 0; 3161 prev = NULL; 3162 break; 3163 3164 case TOK_IN: 3165 fill_cmd(cmd, O_IN, 0, 0); 3166 break; 3167 3168 case TOK_OUT: 3169 cmd->len ^= F_NOT; /* toggle F_NOT */ 3170 fill_cmd(cmd, O_IN, 0, 0); 3171 break; 3172 3173 case TOK_FRAG: 3174 fill_cmd(cmd, O_FRAG, 0, 0); 3175 break; 3176 3177 case TOK_LAYER2: 3178 fill_cmd(cmd, O_LAYER2, 0, 0); 3179 break; 3180 3181 case TOK_XMIT: 3182 case TOK_RECV: 3183 case TOK_VIA: 3184 NEED1("recv, xmit, via require interface name" 3185 " or address"); 3186 fill_iface((ipfw_insn_if *)cmd, av[0]); 3187 ac--; av++; 3188 if (F_LEN(cmd) == 0) /* not a valid address */ 3189 break; 3190 if (i == TOK_XMIT) 3191 cmd->opcode = O_XMIT; 3192 else if (i == TOK_RECV) 3193 cmd->opcode = O_RECV; 3194 else if (i == TOK_VIA) 3195 cmd->opcode = O_VIA; 3196 break; 3197 3198 case TOK_ICMPTYPES: 3199 NEED1("icmptypes requires list of types"); 3200 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3201 av++; ac--; 3202 break; 3203 3204 case TOK_IPTTL: 3205 NEED1("ipttl requires TTL"); 3206 if (strpbrk(*av, "-,")) { 3207 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3208 errx(EX_DATAERR, "invalid ipttl %s", *av); 3209 } else 3210 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3211 ac--; av++; 3212 break; 3213 3214 case TOK_IPID: 3215 NEED1("ipid requires id"); 3216 if (strpbrk(*av, "-,")) { 3217 if (!add_ports(cmd, *av, 0, O_IPID)) 3218 errx(EX_DATAERR, "invalid ipid %s", *av); 3219 } else 3220 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3221 ac--; av++; 3222 break; 3223 3224 case TOK_IPLEN: 3225 NEED1("iplen requires length"); 3226 if (strpbrk(*av, "-,")) { 3227 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3228 errx(EX_DATAERR, "invalid ip len %s", *av); 3229 } else 3230 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3231 ac--; av++; 3232 break; 3233 3234 case TOK_IPVER: 3235 NEED1("ipver requires version"); 3236 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3237 ac--; av++; 3238 break; 3239 3240 case TOK_IPPRECEDENCE: 3241 NEED1("ipprecedence requires value"); 3242 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3243 (strtoul(*av, NULL, 0) & 7) << 5); 3244 ac--; av++; 3245 break; 3246 3247 case TOK_IPOPTS: 3248 NEED1("missing argument for ipoptions"); 3249 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3250 ac--; av++; 3251 break; 3252 3253 case TOK_IPTOS: 3254 NEED1("missing argument for iptos"); 3255 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3256 ac--; av++; 3257 break; 3258 3259 case TOK_UID: 3260 NEED1("uid requires argument"); 3261 { 3262 char *end; 3263 uid_t uid; 3264 struct passwd *pwd; 3265 3266 cmd->opcode = O_UID; 3267 uid = strtoul(*av, &end, 0); 3268 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3269 if (pwd == NULL) 3270 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3271 cmd32->d[0] = pwd->pw_uid; 3272 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3273 ac--; av++; 3274 } 3275 break; 3276 3277 case TOK_GID: 3278 NEED1("gid requires argument"); 3279 { 3280 char *end; 3281 gid_t gid; 3282 struct group *grp; 3283 3284 cmd->opcode = O_GID; 3285 gid = strtoul(*av, &end, 0); 3286 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3287 if (grp == NULL) 3288 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3289 cmd32->d[0] = grp->gr_gid; 3290 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3291 ac--; av++; 3292 } 3293 break; 3294 3295 case TOK_ESTAB: 3296 fill_cmd(cmd, O_ESTAB, 0, 0); 3297 break; 3298 3299 case TOK_SETUP: 3300 fill_cmd(cmd, O_TCPFLAGS, 0, 3301 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3302 break; 3303 3304 case TOK_TCPOPTS: 3305 NEED1("missing argument for tcpoptions"); 3306 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3307 ac--; av++; 3308 break; 3309 3310 case TOK_TCPSEQ: 3311 case TOK_TCPACK: 3312 NEED1("tcpseq/tcpack requires argument"); 3313 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3314 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3315 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3316 ac--; av++; 3317 break; 3318 3319 case TOK_TCPWIN: 3320 NEED1("tcpwin requires length"); 3321 fill_cmd(cmd, O_TCPWIN, 0, 3322 htons(strtoul(*av, NULL, 0))); 3323 ac--; av++; 3324 break; 3325 3326 case TOK_TCPFLAGS: 3327 NEED1("missing argument for tcpflags"); 3328 cmd->opcode = O_TCPFLAGS; 3329 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3330 ac--; av++; 3331 break; 3332 3333 case TOK_KEEPSTATE: 3334 if (open_par) 3335 errx(EX_USAGE, "keep-state cannot be part " 3336 "of an or block"); 3337 if (have_state) 3338 errx(EX_USAGE, "only one of keep-state " 3339 "and limit is allowed"); 3340 have_state = cmd; 3341 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3342 break; 3343 3344 case TOK_LIMIT: 3345 if (open_par) 3346 errx(EX_USAGE, "limit cannot be part " 3347 "of an or block"); 3348 if (have_state) 3349 errx(EX_USAGE, "only one of keep-state " 3350 "and limit is allowed"); 3351 NEED1("limit needs mask and # of connections"); 3352 have_state = cmd; 3353 { 3354 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3355 3356 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3357 cmd->opcode = O_LIMIT; 3358 c->limit_mask = 0; 3359 c->conn_limit = 0; 3360 for (; ac >1 ;) { 3361 int val; 3362 3363 val = match_token(limit_masks, *av); 3364 if (val <= 0) 3365 break; 3366 c->limit_mask |= val; 3367 ac--; av++; 3368 } 3369 c->conn_limit = atoi(*av); 3370 if (c->conn_limit == 0) 3371 errx(EX_USAGE, "limit: limit must be >0"); 3372 if (c->limit_mask == 0) 3373 errx(EX_USAGE, "missing limit mask"); 3374 ac--; av++; 3375 } 3376 break; 3377 3378 case TOK_PROTO: 3379 NEED1("missing protocol"); 3380 if (add_proto(cmd, *av)) { 3381 proto = cmd->arg1; 3382 ac--; av++; 3383 } else 3384 errx(EX_DATAERR, "invalid protocol ``%s''", 3385 *av); 3386 break; 3387 3388 case TOK_SRCIP: 3389 NEED1("missing source IP"); 3390 if (add_srcip(cmd, *av)) { 3391 ac--; av++; 3392 } 3393 break; 3394 3395 case TOK_DSTIP: 3396 NEED1("missing destination IP"); 3397 if (add_dstip(cmd, *av)) { 3398 ac--; av++; 3399 } 3400 break; 3401 3402 case TOK_SRCPORT: 3403 NEED1("missing source port"); 3404 if (!strncmp(*av, "any", strlen(*av)) || 3405 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3406 ac--; av++; 3407 } else 3408 errx(EX_DATAERR, "invalid source port %s", *av); 3409 break; 3410 3411 case TOK_DSTPORT: 3412 NEED1("missing destination port"); 3413 if (!strncmp(*av, "any", strlen(*av)) || 3414 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3415 ac--; av++; 3416 } else 3417 errx(EX_DATAERR, "invalid destination port %s", 3418 *av); 3419 break; 3420 3421 case TOK_MAC: 3422 if (add_mac(cmd, ac, av)) { 3423 ac -= 2; av += 2; 3424 } 3425 break; 3426 3427 case TOK_MACTYPE: 3428 NEED1("missing mac type"); 3429 if (!add_mactype(cmd, ac, *av)) 3430 errx(EX_DATAERR, "invalid mac type %s", *av); 3431 ac--; av++; 3432 break; 3433 3434 case TOK_VERREVPATH: 3435 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3436 break; 3437 3438 case TOK_VERSRCREACH: 3439 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3440 break; 3441 3442 case TOK_IPSEC: 3443 fill_cmd(cmd, O_IPSEC, 0, 0); 3444 break; 3445 3446 case TOK_COMMENT: 3447 fill_comment(cmd, ac, av); 3448 av += ac; 3449 ac = 0; 3450 break; 3451 3452 default: 3453 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3454 } 3455 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3456 prev = cmd; 3457 cmd = next_cmd(cmd); 3458 } 3459 } 3460 3461 done: 3462 /* 3463 * Now copy stuff into the rule. 3464 * If we have a keep-state option, the first instruction 3465 * must be a PROBE_STATE (which is generated here). 3466 * If we have a LOG option, it was stored as the first command, 3467 * and now must be moved to the top of the action part. 3468 */ 3469 dst = (ipfw_insn *)rule->cmd; 3470 3471 /* 3472 * First thing to write into the command stream is the match probability. 3473 */ 3474 if (match_prob != 1) { /* 1 means always match */ 3475 dst->opcode = O_PROB; 3476 dst->len = 2; 3477 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3478 dst += dst->len; 3479 } 3480 3481 /* 3482 * generate O_PROBE_STATE if necessary 3483 */ 3484 if (have_state && have_state->opcode != O_CHECK_STATE) { 3485 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3486 dst = next_cmd(dst); 3487 } 3488 /* 3489 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3490 */ 3491 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3492 i = F_LEN(src); 3493 3494 switch (src->opcode) { 3495 case O_LOG: 3496 case O_KEEP_STATE: 3497 case O_LIMIT: 3498 break; 3499 default: 3500 bcopy(src, dst, i * sizeof(uint32_t)); 3501 dst += i; 3502 } 3503 } 3504 3505 /* 3506 * put back the have_state command as last opcode 3507 */ 3508 if (have_state && have_state->opcode != O_CHECK_STATE) { 3509 i = F_LEN(have_state); 3510 bcopy(have_state, dst, i * sizeof(uint32_t)); 3511 dst += i; 3512 } 3513 /* 3514 * start action section 3515 */ 3516 rule->act_ofs = dst - rule->cmd; 3517 3518 /* 3519 * put back O_LOG if necessary 3520 */ 3521 src = (ipfw_insn *)cmdbuf; 3522 if (src->opcode == O_LOG) { 3523 i = F_LEN(src); 3524 bcopy(src, dst, i * sizeof(uint32_t)); 3525 dst += i; 3526 } 3527 /* 3528 * copy all other actions 3529 */ 3530 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3531 i = F_LEN(src); 3532 bcopy(src, dst, i * sizeof(uint32_t)); 3533 dst += i; 3534 } 3535 3536 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3537 i = (char *)dst - (char *)rule; 3538 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3539 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3540 if (!do_quiet) 3541 show_ipfw(rule, 0, 0); 3542 } 3543 3544 static void 3545 zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3546 { 3547 int rulenum; 3548 int failed = EX_OK; 3549 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3550 3551 av++; ac--; 3552 3553 if (!ac) { 3554 /* clear all entries */ 3555 if (do_cmd(optname, NULL, 0) < 0) 3556 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3557 if (!do_quiet) 3558 printf("%s.\n", optname == IP_FW_ZERO ? 3559 "Accounting cleared":"Logging counts reset"); 3560 3561 return; 3562 } 3563 3564 while (ac) { 3565 /* Rule number */ 3566 if (isdigit(**av)) { 3567 rulenum = atoi(*av); 3568 av++; 3569 ac--; 3570 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3571 warn("rule %u: setsockopt(IP_FW_%s)", 3572 rulenum, name); 3573 failed = EX_UNAVAILABLE; 3574 } else if (!do_quiet) 3575 printf("Entry %d %s.\n", rulenum, 3576 optname == IP_FW_ZERO ? 3577 "cleared" : "logging count reset"); 3578 } else { 3579 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3580 } 3581 } 3582 if (failed != EX_OK) 3583 exit(failed); 3584 } 3585 3586 static void 3587 flush(int force) 3588 { 3589 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3590 3591 if (!force && !do_quiet) { /* need to ask user */ 3592 int c; 3593 3594 printf("Are you sure? [yn] "); 3595 fflush(stdout); 3596 do { 3597 c = toupper(getc(stdin)); 3598 while (c != '\n' && getc(stdin) != '\n') 3599 if (feof(stdin)) 3600 return; /* and do not flush */ 3601 } while (c != 'Y' && c != 'N'); 3602 printf("\n"); 3603 if (c == 'N') /* user said no */ 3604 return; 3605 } 3606 if (do_cmd(cmd, NULL, 0) < 0) 3607 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3608 do_pipe ? "DUMMYNET" : "FW"); 3609 if (!do_quiet) 3610 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3611 } 3612 3613 /* 3614 * Free a the (locally allocated) copy of command line arguments. 3615 */ 3616 static void 3617 free_args(int ac, char **av) 3618 { 3619 int i; 3620 3621 for (i=0; i < ac; i++) 3622 free(av[i]); 3623 free(av); 3624 } 3625 3626 /* 3627 * This one handles all table-related commands 3628 * ipfw table N add addr[/masklen] [value] 3629 * ipfw table N delete addr[/masklen] 3630 * ipfw table N flush 3631 * ipfw table N list 3632 */ 3633 static void 3634 table_handler(int ac, char *av[]) 3635 { 3636 ipfw_table_entry ent; 3637 ipfw_table *tbl; 3638 int do_add; 3639 char *p; 3640 socklen_t l; 3641 uint32_t a; 3642 3643 ac--; av++; 3644 if (ac && isdigit(**av)) { 3645 ent.tbl = atoi(*av); 3646 ac--; av++; 3647 } else 3648 errx(EX_USAGE, "table number required"); 3649 NEED1("table needs command"); 3650 if (strncmp(*av, "add", strlen(*av)) == 0 || 3651 strncmp(*av, "delete", strlen(*av)) == 0) { 3652 do_add = **av == 'a'; 3653 ac--; av++; 3654 if (!ac) 3655 errx(EX_USAGE, "IP address required"); 3656 p = strchr(*av, '/'); 3657 if (p) { 3658 *p++ = '\0'; 3659 ent.masklen = atoi(p); 3660 if (ent.masklen > 32) 3661 errx(EX_DATAERR, "bad width ``%s''", p); 3662 } else 3663 ent.masklen = 32; 3664 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) 3665 errx(EX_NOHOST, "hostname ``%s'' unknown", *av); 3666 ac--; av++; 3667 if (do_add && ac) 3668 ent.value = strtoul(*av, NULL, 0); 3669 else 3670 ent.value = 0; 3671 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, 3672 &ent, sizeof(ent)) < 0) 3673 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", 3674 do_add ? "ADD" : "DEL"); 3675 } else if (strncmp(*av, "flush", strlen(*av)) == 0) { 3676 if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, sizeof(ent.tbl)) < 0) 3677 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); 3678 } else if (strncmp(*av, "list", strlen(*av)) == 0) { 3679 a = ent.tbl; 3680 l = sizeof(a); 3681 if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) 3682 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); 3683 l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); 3684 tbl = malloc(l); 3685 if (tbl == NULL) 3686 err(EX_OSERR, "malloc"); 3687 tbl->tbl = ent.tbl; 3688 if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) 3689 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); 3690 for (a = 0; a < tbl->cnt; a++) { 3691 printf("%s/%u %u\n", 3692 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), 3693 tbl->ent[a].masklen, tbl->ent[a].value); 3694 } 3695 } else 3696 errx(EX_USAGE, "invalid table command %s", *av); 3697 } 3698 3699 /* 3700 * Called with the arguments (excluding program name). 3701 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 3702 */ 3703 static int 3704 ipfw_main(int oldac, char **oldav) 3705 { 3706 int ch, ac, save_ac; 3707 char **av, **save_av; 3708 int do_acct = 0; /* Show packet/byte count */ 3709 3710 #define WHITESP " \t\f\v\n\r" 3711 if (oldac == 0) 3712 return 1; 3713 else if (oldac == 1) { 3714 /* 3715 * If we are called with a single string, try to split it into 3716 * arguments for subsequent parsing. 3717 * But first, remove spaces after a ',', by copying the string 3718 * in-place. 3719 */ 3720 char *arg = oldav[0]; /* The string... */ 3721 int l = strlen(arg); 3722 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3723 int i, j; 3724 for (i = j = 0; i < l; i++) { 3725 if (arg[i] == '#') /* comment marker */ 3726 break; 3727 if (copy) { 3728 arg[j++] = arg[i]; 3729 copy = !index("," WHITESP, arg[i]); 3730 } else { 3731 copy = !index(WHITESP, arg[i]); 3732 if (copy) 3733 arg[j++] = arg[i]; 3734 } 3735 } 3736 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3737 j--; 3738 l = j; /* the new argument length */ 3739 arg[j++] = '\0'; 3740 if (l == 0) /* empty string! */ 3741 return 1; 3742 3743 /* 3744 * First, count number of arguments. Because of the previous 3745 * processing, this is just the number of blanks plus 1. 3746 */ 3747 for (i = 0, ac = 1; i < l; i++) 3748 if (index(WHITESP, arg[i]) != NULL) 3749 ac++; 3750 3751 av = calloc(ac, sizeof(char *)); 3752 3753 /* 3754 * Second, copy arguments from cmd[] to av[]. For each one, 3755 * j is the initial character, i is the one past the end. 3756 */ 3757 for (ac = 0, i = j = 0; i < l; i++) 3758 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3759 if (i == l-1) 3760 i++; 3761 av[ac] = calloc(i-j+1, 1); 3762 bcopy(arg+j, av[ac], i-j); 3763 ac++; 3764 j = i + 1; 3765 } 3766 } else { 3767 /* 3768 * If an argument ends with ',' join with the next one. 3769 */ 3770 int first, i, l; 3771 3772 av = calloc(oldac, sizeof(char *)); 3773 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3774 char *arg = oldav[i]; 3775 int k = strlen(arg); 3776 3777 l += k; 3778 if (arg[k-1] != ',' || i == oldac-1) { 3779 /* Time to copy. */ 3780 av[ac] = calloc(l+1, 1); 3781 for (l=0; first <= i; first++) { 3782 strcat(av[ac]+l, oldav[first]); 3783 l += strlen(oldav[first]); 3784 } 3785 ac++; 3786 l = 0; 3787 first = i+1; 3788 } 3789 } 3790 } 3791 3792 /* Set the force flag for non-interactive processes */ 3793 if (!do_force) 3794 do_force = !isatty(STDIN_FILENO); 3795 3796 /* Save arguments for final freeing of memory. */ 3797 save_ac = ac; 3798 save_av = av; 3799 3800 optind = optreset = 0; 3801 while ((ch = getopt(ac, av, "abcdefhnNqs:STtv")) != -1) 3802 switch (ch) { 3803 case 'a': 3804 do_acct = 1; 3805 break; 3806 3807 case 'b': 3808 comment_only = 1; 3809 do_compact = 1; 3810 break; 3811 3812 case 'c': 3813 do_compact = 1; 3814 break; 3815 3816 case 'd': 3817 do_dynamic = 1; 3818 break; 3819 3820 case 'e': 3821 do_expired = 1; 3822 break; 3823 3824 case 'f': 3825 do_force = 1; 3826 break; 3827 3828 case 'h': /* help */ 3829 free_args(save_ac, save_av); 3830 help(); 3831 break; /* NOTREACHED */ 3832 3833 case 'n': 3834 test_only = 1; 3835 break; 3836 3837 case 'N': 3838 do_resolv = 1; 3839 break; 3840 3841 case 'q': 3842 do_quiet = 1; 3843 break; 3844 3845 case 's': /* sort */ 3846 do_sort = atoi(optarg); 3847 break; 3848 3849 case 'S': 3850 show_sets = 1; 3851 break; 3852 3853 case 't': 3854 do_time = 1; 3855 break; 3856 3857 case 'T': 3858 do_time = 2; /* numeric timestamp */ 3859 break; 3860 3861 case 'v': /* verbose */ 3862 verbose = 1; 3863 break; 3864 3865 default: 3866 free_args(save_ac, save_av); 3867 return 1; 3868 } 3869 3870 ac -= optind; 3871 av += optind; 3872 NEED1("bad arguments, for usage summary ``ipfw''"); 3873 3874 /* 3875 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 3876 * e.g. "100 add allow ..." instead of "add 100 allow ...". 3877 * In case, swap first and second argument to get the normal form. 3878 */ 3879 if (ac > 1 && isdigit(*av[0])) { 3880 char *p = av[0]; 3881 3882 av[0] = av[1]; 3883 av[1] = p; 3884 } 3885 3886 /* 3887 * optional: pipe or queue 3888 */ 3889 do_pipe = 0; 3890 if (!strncmp(*av, "pipe", strlen(*av))) 3891 do_pipe = 1; 3892 else if (!strncmp(*av, "queue", strlen(*av))) 3893 do_pipe = 2; 3894 if (do_pipe) { 3895 ac--; 3896 av++; 3897 } 3898 NEED1("missing command"); 3899 3900 /* 3901 * For pipes and queues we normally say 'pipe NN config' 3902 * but the code is easier to parse as 'pipe config NN' 3903 * so we swap the two arguments. 3904 */ 3905 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3906 char *p = av[0]; 3907 3908 av[0] = av[1]; 3909 av[1] = p; 3910 } 3911 3912 if (!strncmp(*av, "add", strlen(*av))) 3913 add(ac, av); 3914 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3915 config_pipe(ac, av); 3916 else if (!strncmp(*av, "delete", strlen(*av))) 3917 delete(ac, av); 3918 else if (!strncmp(*av, "flush", strlen(*av))) 3919 flush(do_force); 3920 else if (!strncmp(*av, "zero", strlen(*av))) 3921 zero(ac, av, IP_FW_ZERO); 3922 else if (!strncmp(*av, "resetlog", strlen(*av))) 3923 zero(ac, av, IP_FW_RESETLOG); 3924 else if (!strncmp(*av, "print", strlen(*av)) || 3925 !strncmp(*av, "list", strlen(*av))) 3926 list(ac, av, do_acct); 3927 else if (!strncmp(*av, "set", strlen(*av))) 3928 sets_handler(ac, av); 3929 else if (!strncmp(*av, "table", strlen(*av))) 3930 table_handler(ac, av); 3931 else if (!strncmp(*av, "enable", strlen(*av))) 3932 sysctl_handler(ac, av, 1); 3933 else if (!strncmp(*av, "disable", strlen(*av))) 3934 sysctl_handler(ac, av, 0); 3935 else if (!strncmp(*av, "show", strlen(*av))) 3936 list(ac, av, 1 /* show counters */); 3937 else 3938 errx(EX_USAGE, "bad command `%s'", *av); 3939 3940 /* Free memory allocated in the argument parsing. */ 3941 free_args(save_ac, save_av); 3942 return 0; 3943 } 3944 3945 3946 static void 3947 ipfw_readfile(int ac, char *av[]) 3948 { 3949 #define MAX_ARGS 32 3950 char buf[BUFSIZ]; 3951 char *cmd = NULL, *filename = av[ac-1]; 3952 int c, lineno=0; 3953 FILE *f = NULL; 3954 pid_t preproc = 0; 3955 3956 filename = av[ac-1]; 3957 3958 while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { 3959 switch(c) { 3960 case 'c': 3961 do_compact = 1; 3962 break; 3963 3964 case 'f': 3965 do_force = 1; 3966 break; 3967 3968 case 'N': 3969 do_resolv = 1; 3970 break; 3971 3972 case 'n': 3973 test_only = 1; 3974 break; 3975 3976 case 'p': 3977 cmd = optarg; 3978 /* 3979 * Skip previous args and delete last one, so we 3980 * pass all but the last argument to the preprocessor 3981 * via av[optind-1] 3982 */ 3983 av += optind - 1; 3984 ac -= optind - 1; 3985 av[ac-1] = NULL; 3986 fprintf(stderr, "command is %s\n", av[0]); 3987 break; 3988 3989 case 'q': 3990 do_quiet = 1; 3991 break; 3992 3993 case 'S': 3994 show_sets = 1; 3995 break; 3996 3997 default: 3998 errx(EX_USAGE, "bad arguments, for usage" 3999 " summary ``ipfw''"); 4000 } 4001 4002 if (cmd != NULL) 4003 break; 4004 } 4005 4006 if (cmd == NULL && ac != optind + 1) { 4007 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 4008 errx(EX_USAGE, "extraneous filename arguments"); 4009 } 4010 4011 if ((f = fopen(filename, "r")) == NULL) 4012 err(EX_UNAVAILABLE, "fopen: %s", filename); 4013 4014 if (cmd != NULL) { /* pipe through preprocessor */ 4015 int pipedes[2]; 4016 4017 if (pipe(pipedes) == -1) 4018 err(EX_OSERR, "cannot create pipe"); 4019 4020 preproc = fork(); 4021 if (preproc == -1) 4022 err(EX_OSERR, "cannot fork"); 4023 4024 if (preproc == 0) { 4025 /* 4026 * Child, will run the preprocessor with the 4027 * file on stdin and the pipe on stdout. 4028 */ 4029 if (dup2(fileno(f), 0) == -1 4030 || dup2(pipedes[1], 1) == -1) 4031 err(EX_OSERR, "dup2()"); 4032 fclose(f); 4033 close(pipedes[1]); 4034 close(pipedes[0]); 4035 execvp(cmd, av); 4036 err(EX_OSERR, "execvp(%s) failed", cmd); 4037 } else { /* parent, will reopen f as the pipe */ 4038 fclose(f); 4039 close(pipedes[1]); 4040 if ((f = fdopen(pipedes[0], "r")) == NULL) { 4041 int savederrno = errno; 4042 4043 (void)kill(preproc, SIGTERM); 4044 errno = savederrno; 4045 err(EX_OSERR, "fdopen()"); 4046 } 4047 } 4048 } 4049 4050 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 4051 char linename[10]; 4052 char *args[1]; 4053 4054 lineno++; 4055 sprintf(linename, "Line %d", lineno); 4056 setprogname(linename); /* XXX */ 4057 args[0] = buf; 4058 ipfw_main(1, args); 4059 } 4060 fclose(f); 4061 if (cmd != NULL) { 4062 int status; 4063 4064 if (waitpid(preproc, &status, 0) == -1) 4065 errx(EX_OSERR, "waitpid()"); 4066 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 4067 errx(EX_UNAVAILABLE, 4068 "preprocessor exited with status %d", 4069 WEXITSTATUS(status)); 4070 else if (WIFSIGNALED(status)) 4071 errx(EX_UNAVAILABLE, 4072 "preprocessor exited with signal %d", 4073 WTERMSIG(status)); 4074 } 4075 } 4076 4077 int 4078 main(int ac, char *av[]) 4079 { 4080 /* 4081 * If the last argument is an absolute pathname, interpret it 4082 * as a file to be preprocessed. 4083 */ 4084 4085 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 4086 ipfw_readfile(ac, av); 4087 else { 4088 if (ipfw_main(ac-1, av+1)) 4089 show_usage(); 4090 } 4091 return EX_OK; 4092 } 4093