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