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