ipfw2.c revision 130013
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: head/sbin/ipfw/ipfw2.c 130013 2004-06-02 21:12:55Z csjp $ 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 57int 58 do_resolv, /* Would try to resolve all */ 59 do_time, /* Show time stamps */ 60 do_quiet, /* Be quiet in add and flush */ 61 do_pipe, /* this cmd refers to a pipe */ 62 do_sort, /* field to sort results (0 = no) */ 63 do_dynamic, /* display dynamic rules */ 64 do_expired, /* display expired dynamic rules */ 65 do_compact, /* show rules in compact mode */ 66 do_force, /* do not ask for confirmation */ 67 show_sets, /* display rule sets */ 68 test_only, /* only check syntax */ 69 comment_only, /* only print action and comment */ 70 verbose; 71 72#define IP_MASK_ALL 0xffffffff 73/* 74 * the following macro returns an error message if we run out of 75 * arguments. 76 */ 77#define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 78 79/* 80 * _s_x is a structure that stores a string <-> token pairs, used in 81 * various places in the parser. Entries are stored in arrays, 82 * with an entry with s=NULL as terminator. 83 * The search routines are match_token() and match_value(). 84 * Often, an element with x=0 contains an error string. 85 * 86 */ 87struct _s_x { 88 char const *s; 89 int x; 90}; 91 92static struct _s_x f_tcpflags[] = { 93 { "syn", TH_SYN }, 94 { "fin", TH_FIN }, 95 { "ack", TH_ACK }, 96 { "psh", TH_PUSH }, 97 { "rst", TH_RST }, 98 { "urg", TH_URG }, 99 { "tcp flag", 0 }, 100 { NULL, 0 } 101}; 102 103static struct _s_x f_tcpopts[] = { 104 { "mss", IP_FW_TCPOPT_MSS }, 105 { "maxseg", IP_FW_TCPOPT_MSS }, 106 { "window", IP_FW_TCPOPT_WINDOW }, 107 { "sack", IP_FW_TCPOPT_SACK }, 108 { "ts", IP_FW_TCPOPT_TS }, 109 { "timestamp", IP_FW_TCPOPT_TS }, 110 { "cc", IP_FW_TCPOPT_CC }, 111 { "tcp option", 0 }, 112 { NULL, 0 } 113}; 114 115/* 116 * IP options span the range 0 to 255 so we need to remap them 117 * (though in fact only the low 5 bits are significant). 118 */ 119static struct _s_x f_ipopts[] = { 120 { "ssrr", IP_FW_IPOPT_SSRR}, 121 { "lsrr", IP_FW_IPOPT_LSRR}, 122 { "rr", IP_FW_IPOPT_RR}, 123 { "ts", IP_FW_IPOPT_TS}, 124 { "ip option", 0 }, 125 { NULL, 0 } 126}; 127 128static struct _s_x f_iptos[] = { 129 { "lowdelay", IPTOS_LOWDELAY}, 130 { "throughput", IPTOS_THROUGHPUT}, 131 { "reliability", IPTOS_RELIABILITY}, 132 { "mincost", IPTOS_MINCOST}, 133 { "congestion", IPTOS_CE}, 134 { "ecntransport", IPTOS_ECT}, 135 { "ip tos option", 0}, 136 { NULL, 0 } 137}; 138 139static struct _s_x limit_masks[] = { 140 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 141 {"src-addr", DYN_SRC_ADDR}, 142 {"src-port", DYN_SRC_PORT}, 143 {"dst-addr", DYN_DST_ADDR}, 144 {"dst-port", DYN_DST_PORT}, 145 {NULL, 0} 146}; 147 148/* 149 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 150 * This is only used in this code. 151 */ 152#define IPPROTO_ETHERTYPE 0x1000 153static struct _s_x ether_types[] = { 154 /* 155 * Note, we cannot use "-:&/" in the names because they are field 156 * separators in the type specifications. Also, we use s = NULL as 157 * end-delimiter, because a type of 0 can be legal. 158 */ 159 { "ip", 0x0800 }, 160 { "ipv4", 0x0800 }, 161 { "ipv6", 0x86dd }, 162 { "arp", 0x0806 }, 163 { "rarp", 0x8035 }, 164 { "vlan", 0x8100 }, 165 { "loop", 0x9000 }, 166 { "trail", 0x1000 }, 167 { "at", 0x809b }, 168 { "atalk", 0x809b }, 169 { "aarp", 0x80f3 }, 170 { "pppoe_disc", 0x8863 }, 171 { "pppoe_sess", 0x8864 }, 172 { "ipx_8022", 0x00E0 }, 173 { "ipx_8023", 0x0000 }, 174 { "ipx_ii", 0x8137 }, 175 { "ipx_snap", 0x8137 }, 176 { "ipx", 0x8137 }, 177 { "ns", 0x0600 }, 178 { NULL, 0 } 179}; 180 181static void show_usage(void); 182 183enum tokens { 184 TOK_NULL=0, 185 186 TOK_OR, 187 TOK_NOT, 188 TOK_STARTBRACE, 189 TOK_ENDBRACE, 190 191 TOK_ACCEPT, 192 TOK_COUNT, 193 TOK_PIPE, 194 TOK_QUEUE, 195 TOK_DIVERT, 196 TOK_TEE, 197 TOK_FORWARD, 198 TOK_SKIPTO, 199 TOK_DENY, 200 TOK_REJECT, 201 TOK_RESET, 202 TOK_UNREACH, 203 TOK_CHECKSTATE, 204 205 TOK_UID, 206 TOK_GID, 207 TOK_IN, 208 TOK_LIMIT, 209 TOK_KEEPSTATE, 210 TOK_LAYER2, 211 TOK_OUT, 212 TOK_XMIT, 213 TOK_RECV, 214 TOK_VIA, 215 TOK_FRAG, 216 TOK_IPOPTS, 217 TOK_IPLEN, 218 TOK_IPID, 219 TOK_IPPRECEDENCE, 220 TOK_IPTOS, 221 TOK_IPTTL, 222 TOK_IPVER, 223 TOK_ESTAB, 224 TOK_SETUP, 225 TOK_TCPFLAGS, 226 TOK_TCPOPTS, 227 TOK_TCPSEQ, 228 TOK_TCPACK, 229 TOK_TCPWIN, 230 TOK_ICMPTYPES, 231 TOK_MAC, 232 TOK_MACTYPE, 233 TOK_VERREVPATH, 234 TOK_VERSRCREACH, 235 TOK_IPSEC, 236 TOK_COMMENT, 237 238 TOK_PLR, 239 TOK_NOERROR, 240 TOK_BUCKETS, 241 TOK_DSTIP, 242 TOK_SRCIP, 243 TOK_DSTPORT, 244 TOK_SRCPORT, 245 TOK_ALL, 246 TOK_MASK, 247 TOK_BW, 248 TOK_DELAY, 249 TOK_RED, 250 TOK_GRED, 251 TOK_DROPTAIL, 252 TOK_PROTO, 253 TOK_WEIGHT, 254}; 255 256struct _s_x dummynet_params[] = { 257 { "plr", TOK_PLR }, 258 { "noerror", TOK_NOERROR }, 259 { "buckets", TOK_BUCKETS }, 260 { "dst-ip", TOK_DSTIP }, 261 { "src-ip", TOK_SRCIP }, 262 { "dst-port", TOK_DSTPORT }, 263 { "src-port", TOK_SRCPORT }, 264 { "proto", TOK_PROTO }, 265 { "weight", TOK_WEIGHT }, 266 { "all", TOK_ALL }, 267 { "mask", TOK_MASK }, 268 { "droptail", TOK_DROPTAIL }, 269 { "red", TOK_RED }, 270 { "gred", TOK_GRED }, 271 { "bw", TOK_BW }, 272 { "bandwidth", TOK_BW }, 273 { "delay", TOK_DELAY }, 274 { "pipe", TOK_PIPE }, 275 { "queue", TOK_QUEUE }, 276 { "dummynet-params", TOK_NULL }, 277 { NULL, 0 } /* terminator */ 278}; 279 280struct _s_x rule_actions[] = { 281 { "accept", TOK_ACCEPT }, 282 { "pass", TOK_ACCEPT }, 283 { "allow", TOK_ACCEPT }, 284 { "permit", TOK_ACCEPT }, 285 { "count", TOK_COUNT }, 286 { "pipe", TOK_PIPE }, 287 { "queue", TOK_QUEUE }, 288 { "divert", TOK_DIVERT }, 289 { "tee", TOK_TEE }, 290 { "fwd", TOK_FORWARD }, 291 { "forward", TOK_FORWARD }, 292 { "skipto", TOK_SKIPTO }, 293 { "deny", TOK_DENY }, 294 { "drop", TOK_DENY }, 295 { "reject", TOK_REJECT }, 296 { "reset", TOK_RESET }, 297 { "unreach", TOK_UNREACH }, 298 { "check-state", TOK_CHECKSTATE }, 299 { "//", TOK_COMMENT }, 300 { NULL, 0 } /* terminator */ 301}; 302 303struct _s_x rule_options[] = { 304 { "uid", TOK_UID }, 305 { "gid", TOK_GID }, 306 { "in", TOK_IN }, 307 { "limit", TOK_LIMIT }, 308 { "keep-state", TOK_KEEPSTATE }, 309 { "bridged", TOK_LAYER2 }, 310 { "layer2", TOK_LAYER2 }, 311 { "out", TOK_OUT }, 312 { "xmit", TOK_XMIT }, 313 { "recv", TOK_RECV }, 314 { "via", TOK_VIA }, 315 { "fragment", TOK_FRAG }, 316 { "frag", TOK_FRAG }, 317 { "ipoptions", TOK_IPOPTS }, 318 { "ipopts", TOK_IPOPTS }, 319 { "iplen", TOK_IPLEN }, 320 { "ipid", TOK_IPID }, 321 { "ipprecedence", TOK_IPPRECEDENCE }, 322 { "iptos", TOK_IPTOS }, 323 { "ipttl", TOK_IPTTL }, 324 { "ipversion", TOK_IPVER }, 325 { "ipver", TOK_IPVER }, 326 { "estab", TOK_ESTAB }, 327 { "established", TOK_ESTAB }, 328 { "setup", TOK_SETUP }, 329 { "tcpflags", TOK_TCPFLAGS }, 330 { "tcpflgs", TOK_TCPFLAGS }, 331 { "tcpoptions", TOK_TCPOPTS }, 332 { "tcpopts", TOK_TCPOPTS }, 333 { "tcpseq", TOK_TCPSEQ }, 334 { "tcpack", TOK_TCPACK }, 335 { "tcpwin", TOK_TCPWIN }, 336 { "icmptype", TOK_ICMPTYPES }, 337 { "icmptypes", TOK_ICMPTYPES }, 338 { "dst-ip", TOK_DSTIP }, 339 { "src-ip", TOK_SRCIP }, 340 { "dst-port", TOK_DSTPORT }, 341 { "src-port", TOK_SRCPORT }, 342 { "proto", TOK_PROTO }, 343 { "MAC", TOK_MAC }, 344 { "mac", TOK_MAC }, 345 { "mac-type", TOK_MACTYPE }, 346 { "verrevpath", TOK_VERREVPATH }, 347 { "versrcreach", TOK_VERSRCREACH }, 348 { "ipsec", TOK_IPSEC }, 349 { "//", TOK_COMMENT }, 350 351 { "not", TOK_NOT }, /* pseudo option */ 352 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 353 { "or", TOK_OR }, /* pseudo option */ 354 { "|", /* escape */ TOK_OR }, /* pseudo option */ 355 { "{", TOK_STARTBRACE }, /* pseudo option */ 356 { "(", TOK_STARTBRACE }, /* pseudo option */ 357 { "}", TOK_ENDBRACE }, /* pseudo option */ 358 { ")", TOK_ENDBRACE }, /* pseudo option */ 359 { NULL, 0 } /* terminator */ 360}; 361 362static __inline uint64_t 363align_uint64(uint64_t *pll) { 364 uint64_t ret; 365 366 bcopy (pll, &ret, sizeof(ret)); 367 return ret; 368} 369 370/* 371 * conditionally runs the command. 372 */ 373static int 374do_cmd(int optname, void *optval, uintptr_t optlen) 375{ 376 static int s = -1; /* the socket */ 377 int i; 378 379 if (test_only) 380 return 0; 381 382 if (s == -1) 383 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 384 if (s < 0) 385 err(EX_UNAVAILABLE, "socket"); 386 387 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 388 optname == IP_FW_ADD) 389 i = getsockopt(s, IPPROTO_IP, optname, optval, 390 (socklen_t *)optlen); 391 else 392 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 393 return i; 394} 395 396/** 397 * match_token takes a table and a string, returns the value associated 398 * with the string (-1 in case of failure). 399 */ 400static int 401match_token(struct _s_x *table, char *string) 402{ 403 struct _s_x *pt; 404 uint i = strlen(string); 405 406 for (pt = table ; i && pt->s != NULL ; pt++) 407 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 408 return pt->x; 409 return -1; 410} 411 412/** 413 * match_value takes a table and a value, returns the string associated 414 * with the value (NULL in case of failure). 415 */ 416static char const * 417match_value(struct _s_x *p, int value) 418{ 419 for (; p->s != NULL; p++) 420 if (p->x == value) 421 return p->s; 422 return NULL; 423} 424 425/* 426 * prints one port, symbolic or numeric 427 */ 428static void 429print_port(int proto, uint16_t port) 430{ 431 432 if (proto == IPPROTO_ETHERTYPE) { 433 char const *s; 434 435 if (do_resolv && (s = match_value(ether_types, port)) ) 436 printf("%s", s); 437 else 438 printf("0x%04x", port); 439 } else { 440 struct servent *se = NULL; 441 if (do_resolv) { 442 struct protoent *pe = getprotobynumber(proto); 443 444 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 445 } 446 if (se) 447 printf("%s", se->s_name); 448 else 449 printf("%d", port); 450 } 451} 452 453struct _s_x _port_name[] = { 454 {"dst-port", O_IP_DSTPORT}, 455 {"src-port", O_IP_SRCPORT}, 456 {"ipid", O_IPID}, 457 {"iplen", O_IPLEN}, 458 {"ipttl", O_IPTTL}, 459 {"mac-type", O_MAC_TYPE}, 460 {NULL, 0} 461}; 462 463/* 464 * Print the values in a list 16-bit items of the types above. 465 * XXX todo: add support for mask. 466 */ 467static void 468print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 469{ 470 uint16_t *p = cmd->ports; 471 int i; 472 char const *sep; 473 474 if (cmd->o.len & F_NOT) 475 printf(" not"); 476 if (opcode != 0) { 477 sep = match_value(_port_name, opcode); 478 if (sep == NULL) 479 sep = "???"; 480 printf (" %s", sep); 481 } 482 sep = " "; 483 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 484 printf(sep); 485 print_port(proto, p[0]); 486 if (p[0] != p[1]) { 487 printf("-"); 488 print_port(proto, p[1]); 489 } 490 sep = ","; 491 } 492} 493 494/* 495 * Like strtol, but also translates service names into port numbers 496 * for some protocols. 497 * In particular: 498 * proto == -1 disables the protocol check; 499 * proto == IPPROTO_ETHERTYPE looks up an internal table 500 * proto == <some value in /etc/protocols> matches the values there. 501 * Returns *end == s in case the parameter is not found. 502 */ 503static int 504strtoport(char *s, char **end, int base, int proto) 505{ 506 char *p, *buf; 507 char *s1; 508 int i; 509 510 *end = s; /* default - not found */ 511 if (*s == '\0') 512 return 0; /* not found */ 513 514 if (isdigit(*s)) 515 return strtol(s, end, base); 516 517 /* 518 * find separator. '\\' escapes the next char. 519 */ 520 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 521 if (*s1 == '\\' && s1[1] != '\0') 522 s1++; 523 524 buf = malloc(s1 - s + 1); 525 if (buf == NULL) 526 return 0; 527 528 /* 529 * copy into a buffer skipping backslashes 530 */ 531 for (p = s, i = 0; p != s1 ; p++) 532 if (*p != '\\') 533 buf[i++] = *p; 534 buf[i++] = '\0'; 535 536 if (proto == IPPROTO_ETHERTYPE) { 537 i = match_token(ether_types, buf); 538 free(buf); 539 if (i != -1) { /* found */ 540 *end = s1; 541 return i; 542 } 543 } else { 544 struct protoent *pe = NULL; 545 struct servent *se; 546 547 if (proto != 0) 548 pe = getprotobynumber(proto); 549 setservent(1); 550 se = getservbyname(buf, pe ? pe->p_name : NULL); 551 free(buf); 552 if (se != NULL) { 553 *end = s1; 554 return ntohs(se->s_port); 555 } 556 } 557 return 0; /* not found */ 558} 559 560/* 561 * Fill the body of the command with the list of port ranges. 562 */ 563static int 564fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 565{ 566 uint16_t a, b, *p = cmd->ports; 567 int i = 0; 568 char *s = av; 569 570 while (*s) { 571 a = strtoport(av, &s, 0, proto); 572 if (s == av) /* no parameter */ 573 break; 574 if (*s == '-') { /* a range */ 575 av = s+1; 576 b = strtoport(av, &s, 0, proto); 577 if (s == av) /* no parameter */ 578 break; 579 p[0] = a; 580 p[1] = b; 581 } else if (*s == ',' || *s == '\0' ) 582 p[0] = p[1] = a; 583 else /* invalid separator */ 584 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 585 *s, av); 586 i++; 587 p += 2; 588 av = s+1; 589 } 590 if (i > 0) { 591 if (i+1 > F_LEN_MASK) 592 errx(EX_DATAERR, "too many ports/ranges\n"); 593 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 594 } 595 return i; 596} 597 598static struct _s_x icmpcodes[] = { 599 { "net", ICMP_UNREACH_NET }, 600 { "host", ICMP_UNREACH_HOST }, 601 { "protocol", ICMP_UNREACH_PROTOCOL }, 602 { "port", ICMP_UNREACH_PORT }, 603 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 604 { "srcfail", ICMP_UNREACH_SRCFAIL }, 605 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 606 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 607 { "isolated", ICMP_UNREACH_ISOLATED }, 608 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 609 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 610 { "tosnet", ICMP_UNREACH_TOSNET }, 611 { "toshost", ICMP_UNREACH_TOSHOST }, 612 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 613 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 614 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 615 { NULL, 0 } 616}; 617 618static void 619fill_reject_code(u_short *codep, char *str) 620{ 621 int val; 622 char *s; 623 624 val = strtoul(str, &s, 0); 625 if (s == str || *s != '\0' || val >= 0x100) 626 val = match_token(icmpcodes, str); 627 if (val < 0) 628 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 629 *codep = val; 630 return; 631} 632 633static void 634print_reject_code(uint16_t code) 635{ 636 char const *s = match_value(icmpcodes, code); 637 638 if (s != NULL) 639 printf("unreach %s", s); 640 else 641 printf("unreach %u", code); 642} 643 644/* 645 * Returns the number of bits set (from left) in a contiguous bitmask, 646 * or -1 if the mask is not contiguous. 647 * XXX this needs a proper fix. 648 * This effectively works on masks in big-endian (network) format. 649 * when compiled on little endian architectures. 650 * 651 * First bit is bit 7 of the first byte -- note, for MAC addresses, 652 * the first bit on the wire is bit 0 of the first byte. 653 * len is the max length in bits. 654 */ 655static int 656contigmask(uint8_t *p, int len) 657{ 658 int i, n; 659 660 for (i=0; i<len ; i++) 661 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 662 break; 663 for (n=i+1; n < len; n++) 664 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 665 return -1; /* mask not contiguous */ 666 return i; 667} 668 669/* 670 * print flags set/clear in the two bitmasks passed as parameters. 671 * There is a specialized check for f_tcpflags. 672 */ 673static void 674print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 675{ 676 char const *comma = ""; 677 int i; 678 uint8_t set = cmd->arg1 & 0xff; 679 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 680 681 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 682 printf(" setup"); 683 return; 684 } 685 686 printf(" %s ", name); 687 for (i=0; list[i].x != 0; i++) { 688 if (set & list[i].x) { 689 set &= ~list[i].x; 690 printf("%s%s", comma, list[i].s); 691 comma = ","; 692 } 693 if (clear & list[i].x) { 694 clear &= ~list[i].x; 695 printf("%s!%s", comma, list[i].s); 696 comma = ","; 697 } 698 } 699} 700 701/* 702 * Print the ip address contained in a command. 703 */ 704static void 705print_ip(ipfw_insn_ip *cmd, char const *s) 706{ 707 struct hostent *he = NULL; 708 int len = F_LEN((ipfw_insn *)cmd); 709 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 710 711 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 712 713 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 714 printf("me"); 715 return; 716 } 717 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 718 uint32_t x, *map = (uint32_t *)&(cmd->mask); 719 int i, j; 720 char comma = '{'; 721 722 x = cmd->o.arg1 - 1; 723 x = htonl( ~x ); 724 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 725 printf("%s/%d", inet_ntoa(cmd->addr), 726 contigmask((uint8_t *)&x, 32)); 727 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 728 x &= 0xff; /* base */ 729 /* 730 * Print bits and ranges. 731 * Locate first bit set (i), then locate first bit unset (j). 732 * If we have 3+ consecutive bits set, then print them as a 733 * range, otherwise only print the initial bit and rescan. 734 */ 735 for (i=0; i < cmd->o.arg1; i++) 736 if (map[i/32] & (1<<(i & 31))) { 737 for (j=i+1; j < cmd->o.arg1; j++) 738 if (!(map[ j/32] & (1<<(j & 31)))) 739 break; 740 printf("%c%d", comma, i+x); 741 if (j>i+2) { /* range has at least 3 elements */ 742 printf("-%d", j-1+x); 743 i = j-1; 744 } 745 comma = ','; 746 } 747 printf("}"); 748 return; 749 } 750 /* 751 * len == 2 indicates a single IP, whereas lists of 1 or more 752 * addr/mask pairs have len = (2n+1). We convert len to n so we 753 * use that to count the number of entries. 754 */ 755 for (len = len / 2; len > 0; len--, a += 2) { 756 int mb = /* mask length */ 757 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 758 32 : contigmask((uint8_t *)&(a[1]), 32); 759 if (mb == 32 && do_resolv) 760 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 761 if (he != NULL) /* resolved to name */ 762 printf("%s", he->h_name); 763 else if (mb == 0) /* any */ 764 printf("any"); 765 else { /* numeric IP followed by some kind of mask */ 766 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 767 if (mb < 0) 768 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 769 else if (mb < 32) 770 printf("/%d", mb); 771 } 772 if (len > 1) 773 printf(","); 774 } 775} 776 777/* 778 * prints a MAC address/mask pair 779 */ 780static void 781print_mac(uint8_t *addr, uint8_t *mask) 782{ 783 int l = contigmask(mask, 48); 784 785 if (l == 0) 786 printf(" any"); 787 else { 788 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 789 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 790 if (l == -1) 791 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 792 mask[0], mask[1], mask[2], 793 mask[3], mask[4], mask[5]); 794 else if (l < 48) 795 printf("/%d", l); 796 } 797} 798 799static void 800fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 801{ 802 uint8_t type; 803 804 cmd->d[0] = 0; 805 while (*av) { 806 if (*av == ',') 807 av++; 808 809 type = strtoul(av, &av, 0); 810 811 if (*av != ',' && *av != '\0') 812 errx(EX_DATAERR, "invalid ICMP type"); 813 814 if (type > 31) 815 errx(EX_DATAERR, "ICMP type out of range"); 816 817 cmd->d[0] |= 1 << type; 818 } 819 cmd->o.opcode = O_ICMPTYPE; 820 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 821} 822 823static void 824print_icmptypes(ipfw_insn_u32 *cmd) 825{ 826 int i; 827 char sep= ' '; 828 829 printf(" icmptypes"); 830 for (i = 0; i < 32; i++) { 831 if ( (cmd->d[0] & (1 << (i))) == 0) 832 continue; 833 printf("%c%d", sep, i); 834 sep = ','; 835 } 836} 837 838/* 839 * show_ipfw() prints the body of an ipfw rule. 840 * Because the standard rule has at least proto src_ip dst_ip, we use 841 * a helper function to produce these entries if not provided explicitly. 842 * The first argument is the list of fields we have, the second is 843 * the list of fields we want to be printed. 844 * 845 * Special cases if we have provided a MAC header: 846 * + if the rule does not contain IP addresses/ports, do not print them; 847 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 848 * 849 * Once we have 'have_options', IP header fields are printed as options. 850 */ 851#define HAVE_PROTO 0x0001 852#define HAVE_SRCIP 0x0002 853#define HAVE_DSTIP 0x0004 854#define HAVE_MAC 0x0008 855#define HAVE_MACTYPE 0x0010 856#define HAVE_OPTIONS 0x8000 857 858#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 859static void 860show_prerequisites(int *flags, int want, int cmd) 861{ 862 if (comment_only) 863 return; 864 if ( (*flags & HAVE_IP) == HAVE_IP) 865 *flags |= HAVE_OPTIONS; 866 867 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 868 cmd != O_MAC_TYPE) { 869 /* 870 * mac-type was optimized out by the compiler, 871 * restore it 872 */ 873 printf(" any"); 874 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 875 return; 876 } 877 if ( !(*flags & HAVE_OPTIONS)) { 878 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 879 printf(" ip"); 880 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 881 printf(" from any"); 882 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 883 printf(" to any"); 884 } 885 *flags |= want; 886} 887 888static void 889show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 890{ 891 static int twidth = 0; 892 int l; 893 ipfw_insn *cmd; 894 char *comment = NULL; /* ptr to comment if we have one */ 895 int proto = 0; /* default */ 896 int flags = 0; /* prerequisites */ 897 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 898 int or_block = 0; /* we are in an or block */ 899 uint32_t set_disable; 900 901 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 902 903 if (set_disable & (1 << rule->set)) { /* disabled */ 904 if (!show_sets) 905 return; 906 else 907 printf("# DISABLED "); 908 } 909 printf("%05u ", rule->rulenum); 910 911 if (pcwidth>0 || bcwidth>0) 912 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 913 bcwidth, align_uint64(&rule->bcnt)); 914 915 if (do_time == 2) 916 printf("%10u ", rule->timestamp); 917 else if (do_time == 1) { 918 char timestr[30]; 919 time_t t = (time_t)0; 920 921 if (twidth == 0) { 922 strcpy(timestr, ctime(&t)); 923 *strchr(timestr, '\n') = '\0'; 924 twidth = strlen(timestr); 925 } 926 if (rule->timestamp) { 927#if _FreeBSD_version < 500000 /* XXX check */ 928#define _long_to_time(x) (time_t)(x) 929#endif 930 t = _long_to_time(rule->timestamp); 931 932 strcpy(timestr, ctime(&t)); 933 *strchr(timestr, '\n') = '\0'; 934 printf("%s ", timestr); 935 } else { 936 printf("%*s", twidth, " "); 937 } 938 } 939 940 if (show_sets) 941 printf("set %d ", rule->set); 942 943 /* 944 * print the optional "match probability" 945 */ 946 if (rule->cmd_len > 0) { 947 cmd = rule->cmd ; 948 if (cmd->opcode == O_PROB) { 949 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 950 double d = 1.0 * p->d[0]; 951 952 d = (d / 0x7fffffff); 953 printf("prob %f ", d); 954 } 955 } 956 957 /* 958 * first print actions 959 */ 960 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 961 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 962 switch(cmd->opcode) { 963 case O_CHECK_STATE: 964 printf("check-state"); 965 flags = HAVE_IP; /* avoid printing anything else */ 966 break; 967 968 case O_ACCEPT: 969 printf("allow"); 970 break; 971 972 case O_COUNT: 973 printf("count"); 974 break; 975 976 case O_DENY: 977 printf("deny"); 978 break; 979 980 case O_REJECT: 981 if (cmd->arg1 == ICMP_REJECT_RST) 982 printf("reset"); 983 else if (cmd->arg1 == ICMP_UNREACH_HOST) 984 printf("reject"); 985 else 986 print_reject_code(cmd->arg1); 987 break; 988 989 case O_SKIPTO: 990 printf("skipto %u", cmd->arg1); 991 break; 992 993 case O_PIPE: 994 printf("pipe %u", cmd->arg1); 995 break; 996 997 case O_QUEUE: 998 printf("queue %u", cmd->arg1); 999 break; 1000 1001 case O_DIVERT: 1002 printf("divert %u", cmd->arg1); 1003 break; 1004 1005 case O_TEE: 1006 printf("tee %u", cmd->arg1); 1007 break; 1008 1009 case O_FORWARD_IP: 1010 { 1011 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1012 1013 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1014 if (s->sa.sin_port) 1015 printf(",%d", s->sa.sin_port); 1016 } 1017 break; 1018 1019 case O_LOG: /* O_LOG is printed last */ 1020 logptr = (ipfw_insn_log *)cmd; 1021 break; 1022 1023 default: 1024 printf("** unrecognized action %d len %d", 1025 cmd->opcode, cmd->len); 1026 } 1027 } 1028 if (logptr) { 1029 if (logptr->max_log > 0) 1030 printf(" log logamount %d", logptr->max_log); 1031 else 1032 printf(" log"); 1033 } 1034 1035 /* 1036 * then print the body. 1037 */ 1038 if (rule->_pad & 1) { /* empty rules before options */ 1039 if (!do_compact) 1040 printf(" ip from any to any"); 1041 flags |= HAVE_IP | HAVE_OPTIONS; 1042 } 1043 1044 if (comment_only) 1045 comment = "..."; 1046 1047 for (l = rule->act_ofs, cmd = rule->cmd ; 1048 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1049 /* useful alias */ 1050 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1051 1052 if (comment_only) { 1053 if (cmd->opcode != O_NOP) 1054 continue; 1055 printf(" // %s\n", (char *)(cmd + 1)); 1056 return; 1057 } 1058 1059 show_prerequisites(&flags, 0, cmd->opcode); 1060 1061 switch(cmd->opcode) { 1062 case O_PROB: 1063 break; /* done already */ 1064 1065 case O_PROBE_STATE: 1066 break; /* no need to print anything here */ 1067 1068 case O_MACADDR2: { 1069 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1070 1071 if ((cmd->len & F_OR) && !or_block) 1072 printf(" {"); 1073 if (cmd->len & F_NOT) 1074 printf(" not"); 1075 printf(" MAC"); 1076 flags |= HAVE_MAC; 1077 print_mac(m->addr, m->mask); 1078 print_mac(m->addr + 6, m->mask + 6); 1079 } 1080 break; 1081 1082 case O_MAC_TYPE: 1083 if ((cmd->len & F_OR) && !or_block) 1084 printf(" {"); 1085 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1086 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1087 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1088 break; 1089 1090 case O_IP_SRC: 1091 case O_IP_SRC_MASK: 1092 case O_IP_SRC_ME: 1093 case O_IP_SRC_SET: 1094 show_prerequisites(&flags, HAVE_PROTO, 0); 1095 if (!(flags & HAVE_SRCIP)) 1096 printf(" from"); 1097 if ((cmd->len & F_OR) && !or_block) 1098 printf(" {"); 1099 print_ip((ipfw_insn_ip *)cmd, 1100 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1101 flags |= HAVE_SRCIP; 1102 break; 1103 1104 case O_IP_DST: 1105 case O_IP_DST_MASK: 1106 case O_IP_DST_ME: 1107 case O_IP_DST_SET: 1108 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1109 if (!(flags & HAVE_DSTIP)) 1110 printf(" to"); 1111 if ((cmd->len & F_OR) && !or_block) 1112 printf(" {"); 1113 print_ip((ipfw_insn_ip *)cmd, 1114 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1115 flags |= HAVE_DSTIP; 1116 break; 1117 1118 case O_IP_DSTPORT: 1119 show_prerequisites(&flags, HAVE_IP, 0); 1120 case O_IP_SRCPORT: 1121 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1122 if ((cmd->len & F_OR) && !or_block) 1123 printf(" {"); 1124 print_newports((ipfw_insn_u16 *)cmd, proto, 1125 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1126 break; 1127 1128 case O_PROTO: { 1129 struct protoent *pe; 1130 1131 if ((cmd->len & F_OR) && !or_block) 1132 printf(" {"); 1133 if (cmd->len & F_NOT) 1134 printf(" not"); 1135 proto = cmd->arg1; 1136 pe = getprotobynumber(cmd->arg1); 1137 if (flags & HAVE_OPTIONS) 1138 printf(" proto"); 1139 if (pe) 1140 printf(" %s", pe->p_name); 1141 else 1142 printf(" %u", cmd->arg1); 1143 } 1144 flags |= HAVE_PROTO; 1145 break; 1146 1147 default: /*options ... */ 1148 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1149 if ((cmd->len & F_OR) && !or_block) 1150 printf(" {"); 1151 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1152 printf(" not"); 1153 switch(cmd->opcode) { 1154 case O_FRAG: 1155 printf(" frag"); 1156 break; 1157 1158 case O_IN: 1159 printf(cmd->len & F_NOT ? " out" : " in"); 1160 break; 1161 1162 case O_LAYER2: 1163 printf(" layer2"); 1164 break; 1165 case O_XMIT: 1166 case O_RECV: 1167 case O_VIA: { 1168 char const *s; 1169 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1170 1171 if (cmd->opcode == O_XMIT) 1172 s = "xmit"; 1173 else if (cmd->opcode == O_RECV) 1174 s = "recv"; 1175 else /* if (cmd->opcode == O_VIA) */ 1176 s = "via"; 1177 if (cmdif->name[0] == '\0') 1178 printf(" %s %s", s, 1179 inet_ntoa(cmdif->p.ip)); 1180 printf(" %s %s", s, cmdif->name); 1181 } 1182 break; 1183 1184 case O_IPID: 1185 if (F_LEN(cmd) == 1) 1186 printf(" ipid %u", cmd->arg1 ); 1187 else 1188 print_newports((ipfw_insn_u16 *)cmd, 0, 1189 O_IPID); 1190 break; 1191 1192 case O_IPTTL: 1193 if (F_LEN(cmd) == 1) 1194 printf(" ipttl %u", cmd->arg1 ); 1195 else 1196 print_newports((ipfw_insn_u16 *)cmd, 0, 1197 O_IPTTL); 1198 break; 1199 1200 case O_IPVER: 1201 printf(" ipver %u", cmd->arg1 ); 1202 break; 1203 1204 case O_IPPRECEDENCE: 1205 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1206 break; 1207 1208 case O_IPLEN: 1209 if (F_LEN(cmd) == 1) 1210 printf(" iplen %u", cmd->arg1 ); 1211 else 1212 print_newports((ipfw_insn_u16 *)cmd, 0, 1213 O_IPLEN); 1214 break; 1215 1216 case O_IPOPT: 1217 print_flags("ipoptions", cmd, f_ipopts); 1218 break; 1219 1220 case O_IPTOS: 1221 print_flags("iptos", cmd, f_iptos); 1222 break; 1223 1224 case O_ICMPTYPE: 1225 print_icmptypes((ipfw_insn_u32 *)cmd); 1226 break; 1227 1228 case O_ESTAB: 1229 printf(" established"); 1230 break; 1231 1232 case O_TCPFLAGS: 1233 print_flags("tcpflags", cmd, f_tcpflags); 1234 break; 1235 1236 case O_TCPOPTS: 1237 print_flags("tcpoptions", cmd, f_tcpopts); 1238 break; 1239 1240 case O_TCPWIN: 1241 printf(" tcpwin %d", ntohs(cmd->arg1)); 1242 break; 1243 1244 case O_TCPACK: 1245 printf(" tcpack %d", ntohl(cmd32->d[0])); 1246 break; 1247 1248 case O_TCPSEQ: 1249 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1250 break; 1251 1252 case O_UID: 1253 { 1254 struct passwd *pwd = getpwuid(cmd32->d[0]); 1255 1256 if (pwd) 1257 printf(" uid %s", pwd->pw_name); 1258 else 1259 printf(" uid %u", cmd32->d[0]); 1260 } 1261 break; 1262 1263 case O_GID: 1264 { 1265 struct group *grp = getgrgid(cmd32->d[0]); 1266 1267 if (grp) 1268 printf(" gid %s", grp->gr_name); 1269 else 1270 printf(" gid %u", cmd32->d[0]); 1271 } 1272 break; 1273 1274 case O_VERREVPATH: 1275 printf(" verrevpath"); 1276 break; 1277 1278 case O_VERSRCREACH: 1279 printf(" versrcreach"); 1280 break; 1281 1282 case O_IPSEC: 1283 printf(" ipsec"); 1284 break; 1285 1286 case O_NOP: 1287 comment = (char *)(cmd + 1); 1288 break; 1289 1290 case O_KEEP_STATE: 1291 printf(" keep-state"); 1292 break; 1293 1294 case O_LIMIT: 1295 { 1296 struct _s_x *p = limit_masks; 1297 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1298 uint8_t x = c->limit_mask; 1299 char const *comma = " "; 1300 1301 printf(" limit"); 1302 for (; p->x != 0 ; p++) 1303 if ((x & p->x) == p->x) { 1304 x &= ~p->x; 1305 printf("%s%s", comma, p->s); 1306 comma = ","; 1307 } 1308 printf(" %d", c->conn_limit); 1309 } 1310 break; 1311 1312 default: 1313 printf(" [opcode %d len %d]", 1314 cmd->opcode, cmd->len); 1315 } 1316 } 1317 if (cmd->len & F_OR) { 1318 printf(" or"); 1319 or_block = 1; 1320 } else if (or_block) { 1321 printf(" }"); 1322 or_block = 0; 1323 } 1324 } 1325 show_prerequisites(&flags, HAVE_IP, 0); 1326 if (comment) 1327 printf(" // %s", comment); 1328 printf("\n"); 1329} 1330 1331static void 1332show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1333{ 1334 struct protoent *pe; 1335 struct in_addr a; 1336 uint16_t rulenum; 1337 1338 if (!do_expired) { 1339 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1340 return; 1341 } 1342 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1343 printf("%05d", rulenum); 1344 if (pcwidth>0 || bcwidth>0) 1345 printf(" %*llu %*llu (%ds)", pcwidth, 1346 align_uint64(&d->pcnt), bcwidth, 1347 align_uint64(&d->bcnt), d->expire); 1348 switch (d->dyn_type) { 1349 case O_LIMIT_PARENT: 1350 printf(" PARENT %d", d->count); 1351 break; 1352 case O_LIMIT: 1353 printf(" LIMIT"); 1354 break; 1355 case O_KEEP_STATE: /* bidir, no mask */ 1356 printf(" STATE"); 1357 break; 1358 } 1359 1360 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1361 printf(" %s", pe->p_name); 1362 else 1363 printf(" proto %u", d->id.proto); 1364 1365 a.s_addr = htonl(d->id.src_ip); 1366 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1367 1368 a.s_addr = htonl(d->id.dst_ip); 1369 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1370 printf("\n"); 1371} 1372 1373static int 1374sort_q(const void *pa, const void *pb) 1375{ 1376 int rev = (do_sort < 0); 1377 int field = rev ? -do_sort : do_sort; 1378 long long res = 0; 1379 const struct dn_flow_queue *a = pa; 1380 const struct dn_flow_queue *b = pb; 1381 1382 switch (field) { 1383 case 1: /* pkts */ 1384 res = a->len - b->len; 1385 break; 1386 case 2: /* bytes */ 1387 res = a->len_bytes - b->len_bytes; 1388 break; 1389 1390 case 3: /* tot pkts */ 1391 res = a->tot_pkts - b->tot_pkts; 1392 break; 1393 1394 case 4: /* tot bytes */ 1395 res = a->tot_bytes - b->tot_bytes; 1396 break; 1397 } 1398 if (res < 0) 1399 res = -1; 1400 if (res > 0) 1401 res = 1; 1402 return (int)(rev ? res : -res); 1403} 1404 1405static void 1406list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1407{ 1408 int l; 1409 1410 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1411 fs->flow_mask.proto, 1412 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1413 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1414 if (fs->rq_elements == 0) 1415 return; 1416 1417 printf("BKT Prot ___Source IP/port____ " 1418 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1419 if (do_sort != 0) 1420 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1421 for (l = 0; l < fs->rq_elements; l++) { 1422 struct in_addr ina; 1423 struct protoent *pe; 1424 1425 ina.s_addr = htonl(q[l].id.src_ip); 1426 printf("%3d ", q[l].hash_slot); 1427 pe = getprotobynumber(q[l].id.proto); 1428 if (pe) 1429 printf("%-4s ", pe->p_name); 1430 else 1431 printf("%4u ", q[l].id.proto); 1432 printf("%15s/%-5d ", 1433 inet_ntoa(ina), q[l].id.src_port); 1434 ina.s_addr = htonl(q[l].id.dst_ip); 1435 printf("%15s/%-5d ", 1436 inet_ntoa(ina), q[l].id.dst_port); 1437 printf("%4qu %8qu %2u %4u %3u\n", 1438 q[l].tot_pkts, q[l].tot_bytes, 1439 q[l].len, q[l].len_bytes, q[l].drops); 1440 if (verbose) 1441 printf(" S %20qd F %20qd\n", 1442 q[l].S, q[l].F); 1443 } 1444} 1445 1446static void 1447print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1448{ 1449 int l; 1450 char qs[30]; 1451 char plr[30]; 1452 char red[90]; /* Display RED parameters */ 1453 1454 l = fs->qsize; 1455 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1456 if (l >= 8192) 1457 sprintf(qs, "%d KB", l / 1024); 1458 else 1459 sprintf(qs, "%d B", l); 1460 } else 1461 sprintf(qs, "%3d sl.", l); 1462 if (fs->plr) 1463 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1464 else 1465 plr[0] = '\0'; 1466 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1467 sprintf(red, 1468 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1469 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1470 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1471 SCALE_VAL(fs->min_th), 1472 SCALE_VAL(fs->max_th), 1473 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1474 else 1475 sprintf(red, "droptail"); 1476 1477 printf("%s %s%s %d queues (%d buckets) %s\n", 1478 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1479} 1480 1481static void 1482list_pipes(void *data, uint nbytes, int ac, char *av[]) 1483{ 1484 int rulenum; 1485 void *next = data; 1486 struct dn_pipe *p = (struct dn_pipe *) data; 1487 struct dn_flow_set *fs; 1488 struct dn_flow_queue *q; 1489 int l; 1490 1491 if (ac > 0) 1492 rulenum = strtoul(*av++, NULL, 10); 1493 else 1494 rulenum = 0; 1495 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1496 double b = p->bandwidth; 1497 char buf[30]; 1498 char prefix[80]; 1499 1500 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1501 break; /* done with pipes, now queues */ 1502 1503 /* 1504 * compute length, as pipe have variable size 1505 */ 1506 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1507 next = (char *)p + l; 1508 nbytes -= l; 1509 1510 if (rulenum != 0 && rulenum != p->pipe_nr) 1511 continue; 1512 1513 /* 1514 * Print rate (or clocking interface) 1515 */ 1516 if (p->if_name[0] != '\0') 1517 sprintf(buf, "%s", p->if_name); 1518 else if (b == 0) 1519 sprintf(buf, "unlimited"); 1520 else if (b >= 1000000) 1521 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1522 else if (b >= 1000) 1523 sprintf(buf, "%7.3f Kbit/s", b/1000); 1524 else 1525 sprintf(buf, "%7.3f bit/s ", b); 1526 1527 sprintf(prefix, "%05d: %s %4d ms ", 1528 p->pipe_nr, buf, p->delay); 1529 print_flowset_parms(&(p->fs), prefix); 1530 if (verbose) 1531 printf(" V %20qd\n", p->V >> MY_M); 1532 1533 q = (struct dn_flow_queue *)(p+1); 1534 list_queues(&(p->fs), q); 1535 } 1536 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1537 char prefix[80]; 1538 1539 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1540 break; 1541 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1542 next = (char *)fs + l; 1543 nbytes -= l; 1544 q = (struct dn_flow_queue *)(fs+1); 1545 sprintf(prefix, "q%05d: weight %d pipe %d ", 1546 fs->fs_nr, fs->weight, fs->parent_nr); 1547 print_flowset_parms(fs, prefix); 1548 list_queues(fs, q); 1549 } 1550} 1551 1552/* 1553 * This one handles all set-related commands 1554 * ipfw set { show | enable | disable } 1555 * ipfw set swap X Y 1556 * ipfw set move X to Y 1557 * ipfw set move rule X to Y 1558 */ 1559static void 1560sets_handler(int ac, char *av[]) 1561{ 1562 uint32_t set_disable, masks[2]; 1563 int i, nbytes; 1564 uint16_t rulenum; 1565 uint8_t cmd, new_set; 1566 1567 ac--; 1568 av++; 1569 1570 if (!ac) 1571 errx(EX_USAGE, "set needs command"); 1572 if (!strncmp(*av, "show", strlen(*av)) ) { 1573 void *data; 1574 char const *msg; 1575 1576 nbytes = sizeof(struct ip_fw); 1577 if ((data = calloc(1, nbytes)) == NULL) 1578 err(EX_OSERR, "calloc"); 1579 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1580 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1581 bcopy(&((struct ip_fw *)data)->next_rule, 1582 &set_disable, sizeof(set_disable)); 1583 1584 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1585 if ((set_disable & (1<<i))) { 1586 printf("%s %d", msg, i); 1587 msg = ""; 1588 } 1589 msg = (set_disable) ? " enable" : "enable"; 1590 for (i = 0; i < RESVD_SET; i++) 1591 if (!(set_disable & (1<<i))) { 1592 printf("%s %d", msg, i); 1593 msg = ""; 1594 } 1595 printf("\n"); 1596 } else if (!strncmp(*av, "swap", strlen(*av))) { 1597 ac--; av++; 1598 if (ac != 2) 1599 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1600 rulenum = atoi(av[0]); 1601 new_set = atoi(av[1]); 1602 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1603 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1604 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1605 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1606 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1607 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1608 } else if (!strncmp(*av, "move", strlen(*av))) { 1609 ac--; av++; 1610 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1611 cmd = 2; 1612 ac--; av++; 1613 } else 1614 cmd = 3; 1615 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1616 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1617 rulenum = atoi(av[0]); 1618 new_set = atoi(av[2]); 1619 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1620 (cmd == 2 && rulenum == 65535) ) 1621 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1622 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1623 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1624 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1625 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1626 } else if (!strncmp(*av, "disable", strlen(*av)) || 1627 !strncmp(*av, "enable", strlen(*av)) ) { 1628 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1629 1630 ac--; av++; 1631 masks[0] = masks[1] = 0; 1632 1633 while (ac) { 1634 if (isdigit(**av)) { 1635 i = atoi(*av); 1636 if (i < 0 || i > RESVD_SET) 1637 errx(EX_DATAERR, 1638 "invalid set number %d\n", i); 1639 masks[which] |= (1<<i); 1640 } else if (!strncmp(*av, "disable", strlen(*av))) 1641 which = 0; 1642 else if (!strncmp(*av, "enable", strlen(*av))) 1643 which = 1; 1644 else 1645 errx(EX_DATAERR, 1646 "invalid set command %s\n", *av); 1647 av++; ac--; 1648 } 1649 if ( (masks[0] & masks[1]) != 0 ) 1650 errx(EX_DATAERR, 1651 "cannot enable and disable the same set\n"); 1652 1653 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1654 if (i) 1655 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1656 } else 1657 errx(EX_USAGE, "invalid set command %s\n", *av); 1658} 1659 1660static void 1661sysctl_handler(int ac, char *av[], int which) 1662{ 1663 ac--; 1664 av++; 1665 1666 if (ac == 0) { 1667 warnx("missing keyword to enable/disable\n"); 1668 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1669 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1670 &which, sizeof(which)); 1671 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1672 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1673 &which, sizeof(which)); 1674 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1675 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1676 &which, sizeof(which)); 1677 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1678 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1679 &which, sizeof(which)); 1680 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1681 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1682 &which, sizeof(which)); 1683 } else { 1684 warnx("unrecognize enable/disable keyword: %s\n", *av); 1685 } 1686} 1687 1688static void 1689list(int ac, char *av[], int show_counters) 1690{ 1691 struct ip_fw *r; 1692 ipfw_dyn_rule *dynrules, *d; 1693 1694#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1695 char *lim; 1696 void *data = NULL; 1697 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1698 int exitval = EX_OK; 1699 int lac; 1700 char **lav; 1701 u_long rnum, last; 1702 char *endptr; 1703 int seen = 0; 1704 1705 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1706 int nalloc = 1024; /* start somewhere... */ 1707 1708 if (test_only) { 1709 fprintf(stderr, "Testing only, list disabled\n"); 1710 return; 1711 } 1712 1713 ac--; 1714 av++; 1715 1716 /* get rules or pipes from kernel, resizing array as necessary */ 1717 nbytes = nalloc; 1718 1719 while (nbytes >= nalloc) { 1720 nalloc = nalloc * 2 + 200; 1721 nbytes = nalloc; 1722 if ((data = realloc(data, nbytes)) == NULL) 1723 err(EX_OSERR, "realloc"); 1724 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1725 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1726 do_pipe ? "DUMMYNET" : "FW"); 1727 } 1728 1729 if (do_pipe) { 1730 list_pipes(data, nbytes, ac, av); 1731 goto done; 1732 } 1733 1734 /* 1735 * Count static rules. They have variable size so we 1736 * need to scan the list to count them. 1737 */ 1738 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1739 r->rulenum < 65535 && (char *)r < lim; 1740 ++nstat, r = NEXT(r) ) 1741 ; /* nothing */ 1742 1743 /* 1744 * Count dynamic rules. This is easier as they have 1745 * fixed size. 1746 */ 1747 r = NEXT(r); 1748 dynrules = (ipfw_dyn_rule *)r ; 1749 n = (char *)r - (char *)data; 1750 ndyn = (nbytes - n) / sizeof *dynrules; 1751 1752 /* if showing stats, figure out column widths ahead of time */ 1753 bcwidth = pcwidth = 0; 1754 if (show_counters) { 1755 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1756 /* packet counter */ 1757 width = snprintf(NULL, 0, "%llu", 1758 align_uint64(&r->pcnt)); 1759 if (width > pcwidth) 1760 pcwidth = width; 1761 1762 /* byte counter */ 1763 width = snprintf(NULL, 0, "%llu", 1764 align_uint64(&r->bcnt)); 1765 if (width > bcwidth) 1766 bcwidth = width; 1767 } 1768 } 1769 if (do_dynamic && ndyn) { 1770 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1771 width = snprintf(NULL, 0, "%llu", 1772 align_uint64(&d->pcnt)); 1773 if (width > pcwidth) 1774 pcwidth = width; 1775 1776 width = snprintf(NULL, 0, "%llu", 1777 align_uint64(&d->bcnt)); 1778 if (width > bcwidth) 1779 bcwidth = width; 1780 } 1781 } 1782 /* if no rule numbers were specified, list all rules */ 1783 if (ac == 0) { 1784 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1785 show_ipfw(r, pcwidth, bcwidth); 1786 1787 if (do_dynamic && ndyn) { 1788 printf("## Dynamic rules (%d):\n", ndyn); 1789 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1790 show_dyn_ipfw(d, pcwidth, bcwidth); 1791 } 1792 goto done; 1793 } 1794 1795 /* display specific rules requested on command line */ 1796 1797 for (lac = ac, lav = av; lac != 0; lac--) { 1798 /* convert command line rule # */ 1799 last = rnum = strtoul(*lav++, &endptr, 10); 1800 if (*endptr == '-') 1801 last = strtoul(endptr+1, &endptr, 10); 1802 if (*endptr) { 1803 exitval = EX_USAGE; 1804 warnx("invalid rule number: %s", *(lav - 1)); 1805 continue; 1806 } 1807 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1808 if (r->rulenum > last) 1809 break; 1810 if (r->rulenum >= rnum && r->rulenum <= last) { 1811 show_ipfw(r, pcwidth, bcwidth); 1812 seen = 1; 1813 } 1814 } 1815 if (!seen) { 1816 /* give precedence to other error(s) */ 1817 if (exitval == EX_OK) 1818 exitval = EX_UNAVAILABLE; 1819 warnx("rule %lu does not exist", rnum); 1820 } 1821 } 1822 1823 if (do_dynamic && ndyn) { 1824 printf("## Dynamic rules:\n"); 1825 for (lac = ac, lav = av; lac != 0; lac--) { 1826 rnum = strtoul(*lav++, &endptr, 10); 1827 if (*endptr == '-') 1828 last = strtoul(endptr+1, &endptr, 10); 1829 if (*endptr) 1830 /* already warned */ 1831 continue; 1832 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1833 uint16_t rulenum; 1834 1835 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1836 if (rulenum > rnum) 1837 break; 1838 if (r->rulenum >= rnum && r->rulenum <= last) 1839 show_dyn_ipfw(d, pcwidth, bcwidth); 1840 } 1841 } 1842 } 1843 1844 ac = 0; 1845 1846done: 1847 free(data); 1848 1849 if (exitval != EX_OK) 1850 exit(exitval); 1851#undef NEXT 1852} 1853 1854static void 1855show_usage(void) 1856{ 1857 fprintf(stderr, "usage: ipfw [options]\n" 1858"do \"ipfw -h\" or see ipfw manpage for details\n" 1859); 1860 exit(EX_USAGE); 1861} 1862 1863static void 1864help(void) 1865{ 1866 fprintf(stderr, 1867"ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1868"ipfw [-abcdefhnNqStTv] <command> where <command> is one of:\n" 1869"add [num] [set N] [prob x] RULE-BODY\n" 1870"{pipe|queue} N config PIPE-BODY\n" 1871"[pipe|queue] {zero|delete|show} [N{,N}]\n" 1872"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1873"\n" 1874"RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1875"ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1876" {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1877"ADDR: [ MAC dst src ether_type ] \n" 1878" [ from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 1879"IPADDR: [not] { any | me | ip/bits{x,y,z} | IPLIST }\n" 1880"IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 1881"OPTION_LIST: OPTION [OPTION_LIST]\n" 1882"OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1883" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1884" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1885" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1886" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1887" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1888" verrevpath | versrcreach\n" 1889); 1890exit(0); 1891} 1892 1893 1894static int 1895lookup_host (char *host, struct in_addr *ipaddr) 1896{ 1897 struct hostent *he; 1898 1899 if (!inet_aton(host, ipaddr)) { 1900 if ((he = gethostbyname(host)) == NULL) 1901 return(-1); 1902 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1903 } 1904 return(0); 1905} 1906 1907/* 1908 * fills the addr and mask fields in the instruction as appropriate from av. 1909 * Update length as appropriate. 1910 * The following formats are allowed: 1911 * any matches any IP. Actually returns an empty instruction. 1912 * me returns O_IP_*_ME 1913 * 1.2.3.4 single IP address 1914 * 1.2.3.4:5.6.7.8 address:mask 1915 * 1.2.3.4/24 address/mask 1916 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1917 * We can have multiple comma-separated address/mask entries. 1918 */ 1919static void 1920fill_ip(ipfw_insn_ip *cmd, char *av) 1921{ 1922 int len = 0; 1923 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1924 1925 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1926 1927 if (!strncmp(av, "any", strlen(av))) 1928 return; 1929 1930 if (!strncmp(av, "me", strlen(av))) { 1931 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1932 return; 1933 } 1934 1935 while (av) { 1936 /* 1937 * After the address we can have '/' or ':' indicating a mask, 1938 * ',' indicating another address follows, '{' indicating a 1939 * set of addresses of unspecified size. 1940 */ 1941 char *p = strpbrk(av, "/:,{"); 1942 int masklen; 1943 char md; 1944 1945 if (p) { 1946 md = *p; 1947 *p++ = '\0'; 1948 } else 1949 md = '\0'; 1950 1951 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1952 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1953 switch (md) { 1954 case ':': 1955 if (!inet_aton(p, (struct in_addr *)&d[1])) 1956 errx(EX_DATAERR, "bad netmask ``%s''", p); 1957 break; 1958 case '/': 1959 masklen = atoi(p); 1960 if (masklen == 0) 1961 d[1] = htonl(0); /* mask */ 1962 else if (masklen > 32) 1963 errx(EX_DATAERR, "bad width ``%s''", p); 1964 else 1965 d[1] = htonl(~0 << (32 - masklen)); 1966 break; 1967 case '{': /* no mask, assume /24 and put back the '{' */ 1968 d[1] = htonl(~0 << (32 - 24)); 1969 *(--p) = md; 1970 break; 1971 1972 case ',': /* single address plus continuation */ 1973 *(--p) = md; 1974 /* FALLTHROUGH */ 1975 case 0: /* initialization value */ 1976 default: 1977 d[1] = htonl(~0); /* force /32 */ 1978 break; 1979 } 1980 d[0] &= d[1]; /* mask base address with mask */ 1981 /* find next separator */ 1982 if (p) 1983 p = strpbrk(p, ",{"); 1984 if (p && *p == '{') { 1985 /* 1986 * We have a set of addresses. They are stored as follows: 1987 * arg1 is the set size (powers of 2, 2..256) 1988 * addr is the base address IN HOST FORMAT 1989 * mask.. is an array of arg1 bits (rounded up to 1990 * the next multiple of 32) with bits set 1991 * for each host in the map. 1992 */ 1993 uint32_t *map = (uint32_t *)&cmd->mask; 1994 int low, high; 1995 int i = contigmask((uint8_t *)&(d[1]), 32); 1996 1997 if (len > 0) 1998 errx(EX_DATAERR, "address set cannot be in a list"); 1999 if (i < 24 || i > 31) 2000 errx(EX_DATAERR, "invalid set with mask %d\n", i); 2001 cmd->o.arg1 = 1<<(32-i); /* map length */ 2002 d[0] = ntohl(d[0]); /* base addr in host format */ 2003 cmd->o.opcode = O_IP_DST_SET; /* default */ 2004 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 2005 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 2006 map[i] = 0; /* clear map */ 2007 2008 av = p + 1; 2009 low = d[0] & 0xff; 2010 high = low + cmd->o.arg1 - 1; 2011 /* 2012 * Here, i stores the previous value when we specify a range 2013 * of addresses within a mask, e.g. 45-63. i = -1 means we 2014 * have no previous value. 2015 */ 2016 i = -1; /* previous value in a range */ 2017 while (isdigit(*av)) { 2018 char *s; 2019 int a = strtol(av, &s, 0); 2020 2021 if (s == av) { /* no parameter */ 2022 if (*av != '}') 2023 errx(EX_DATAERR, "set not closed\n"); 2024 if (i != -1) 2025 errx(EX_DATAERR, "incomplete range %d-", i); 2026 break; 2027 } 2028 if (a < low || a > high) 2029 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2030 a, low, high); 2031 a -= low; 2032 if (i == -1) /* no previous in range */ 2033 i = a; 2034 else { /* check that range is valid */ 2035 if (i > a) 2036 errx(EX_DATAERR, "invalid range %d-%d", 2037 i+low, a+low); 2038 if (*s == '-') 2039 errx(EX_DATAERR, "double '-' in range"); 2040 } 2041 for (; i <= a; i++) 2042 map[i/32] |= 1<<(i & 31); 2043 i = -1; 2044 if (*s == '-') 2045 i = a; 2046 else if (*s == '}') 2047 break; 2048 av = s+1; 2049 } 2050 return; 2051 } 2052 av = p; 2053 if (av) /* then *av must be a ',' */ 2054 av++; 2055 2056 /* Check this entry */ 2057 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2058 /* 2059 * 'any' turns the entire list into a NOP. 2060 * 'not any' never matches, so it is removed from the 2061 * list unless it is the only item, in which case we 2062 * report an error. 2063 */ 2064 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2065 if (av == NULL && len == 0) /* only this entry */ 2066 errx(EX_DATAERR, "not any never matches"); 2067 } 2068 /* else do nothing and skip this entry */ 2069 return; 2070 } 2071 /* A single IP can be stored in an optimized format */ 2072 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2073 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2074 return; 2075 } 2076 len += 2; /* two words... */ 2077 d += 2; 2078 } /* end while */ 2079 cmd->o.len |= len+1; 2080} 2081 2082 2083/* 2084 * helper function to process a set of flags and set bits in the 2085 * appropriate masks. 2086 */ 2087static void 2088fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2089 struct _s_x *flags, char *p) 2090{ 2091 uint8_t set=0, clear=0; 2092 2093 while (p && *p) { 2094 char *q; /* points to the separator */ 2095 int val; 2096 uint8_t *which; /* mask we are working on */ 2097 2098 if (*p == '!') { 2099 p++; 2100 which = &clear; 2101 } else 2102 which = &set; 2103 q = strchr(p, ','); 2104 if (q) 2105 *q++ = '\0'; 2106 val = match_token(flags, p); 2107 if (val <= 0) 2108 errx(EX_DATAERR, "invalid flag %s", p); 2109 *which |= (uint8_t)val; 2110 p = q; 2111 } 2112 cmd->opcode = opcode; 2113 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2114 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2115} 2116 2117 2118static void 2119delete(int ac, char *av[]) 2120{ 2121 uint32_t rulenum; 2122 struct dn_pipe p; 2123 int i; 2124 int exitval = EX_OK; 2125 int do_set = 0; 2126 2127 memset(&p, 0, sizeof p); 2128 2129 av++; ac--; 2130 NEED1("missing rule specification"); 2131 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2132 do_set = 1; /* delete set */ 2133 ac--; av++; 2134 } 2135 2136 /* Rule number */ 2137 while (ac && isdigit(**av)) { 2138 i = atoi(*av); av++; ac--; 2139 if (do_pipe) { 2140 if (do_pipe == 1) 2141 p.pipe_nr = i; 2142 else 2143 p.fs.fs_nr = i; 2144 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2145 if (i) { 2146 exitval = 1; 2147 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2148 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2149 } 2150 } else { 2151 rulenum = (i & 0xffff) | (do_set << 24); 2152 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2153 if (i) { 2154 exitval = EX_UNAVAILABLE; 2155 warn("rule %u: setsockopt(IP_FW_DEL)", 2156 rulenum); 2157 } 2158 } 2159 } 2160 if (exitval != EX_OK) 2161 exit(exitval); 2162} 2163 2164 2165/* 2166 * fill the interface structure. We do not check the name as we can 2167 * create interfaces dynamically, so checking them at insert time 2168 * makes relatively little sense. 2169 * Interface names containing '*', '?', or '[' are assumed to be shell 2170 * patterns which match interfaces. 2171 */ 2172static void 2173fill_iface(ipfw_insn_if *cmd, char *arg) 2174{ 2175 cmd->name[0] = '\0'; 2176 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2177 2178 /* Parse the interface or address */ 2179 if (!strcmp(arg, "any")) 2180 cmd->o.len = 0; /* effectively ignore this command */ 2181 else if (!isdigit(*arg)) { 2182 strlcpy(cmd->name, arg, sizeof(cmd->name)); 2183 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; 2184 } else if (!inet_aton(arg, &cmd->p.ip)) 2185 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2186} 2187 2188static void 2189config_pipe(int ac, char **av) 2190{ 2191 struct dn_pipe p; 2192 int i; 2193 char *end; 2194 uint32_t a; 2195 void *par = NULL; 2196 2197 memset(&p, 0, sizeof p); 2198 2199 av++; ac--; 2200 /* Pipe number */ 2201 if (ac && isdigit(**av)) { 2202 i = atoi(*av); av++; ac--; 2203 if (do_pipe == 1) 2204 p.pipe_nr = i; 2205 else 2206 p.fs.fs_nr = i; 2207 } 2208 while (ac > 0) { 2209 double d; 2210 int tok = match_token(dummynet_params, *av); 2211 ac--; av++; 2212 2213 switch(tok) { 2214 case TOK_NOERROR: 2215 p.fs.flags_fs |= DN_NOERROR; 2216 break; 2217 2218 case TOK_PLR: 2219 NEED1("plr needs argument 0..1\n"); 2220 d = strtod(av[0], NULL); 2221 if (d > 1) 2222 d = 1; 2223 else if (d < 0) 2224 d = 0; 2225 p.fs.plr = (int)(d*0x7fffffff); 2226 ac--; av++; 2227 break; 2228 2229 case TOK_QUEUE: 2230 NEED1("queue needs queue size\n"); 2231 end = NULL; 2232 p.fs.qsize = strtoul(av[0], &end, 0); 2233 if (*end == 'K' || *end == 'k') { 2234 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2235 p.fs.qsize *= 1024; 2236 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2237 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2238 } 2239 ac--; av++; 2240 break; 2241 2242 case TOK_BUCKETS: 2243 NEED1("buckets needs argument\n"); 2244 p.fs.rq_size = strtoul(av[0], NULL, 0); 2245 ac--; av++; 2246 break; 2247 2248 case TOK_MASK: 2249 NEED1("mask needs mask specifier\n"); 2250 /* 2251 * per-flow queue, mask is dst_ip, dst_port, 2252 * src_ip, src_port, proto measured in bits 2253 */ 2254 par = NULL; 2255 2256 p.fs.flow_mask.dst_ip = 0; 2257 p.fs.flow_mask.src_ip = 0; 2258 p.fs.flow_mask.dst_port = 0; 2259 p.fs.flow_mask.src_port = 0; 2260 p.fs.flow_mask.proto = 0; 2261 end = NULL; 2262 2263 while (ac >= 1) { 2264 uint32_t *p32 = NULL; 2265 uint16_t *p16 = NULL; 2266 2267 tok = match_token(dummynet_params, *av); 2268 ac--; av++; 2269 switch(tok) { 2270 case TOK_ALL: 2271 /* 2272 * special case, all bits significant 2273 */ 2274 p.fs.flow_mask.dst_ip = ~0; 2275 p.fs.flow_mask.src_ip = ~0; 2276 p.fs.flow_mask.dst_port = ~0; 2277 p.fs.flow_mask.src_port = ~0; 2278 p.fs.flow_mask.proto = ~0; 2279 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2280 goto end_mask; 2281 2282 case TOK_DSTIP: 2283 p32 = &p.fs.flow_mask.dst_ip; 2284 break; 2285 2286 case TOK_SRCIP: 2287 p32 = &p.fs.flow_mask.src_ip; 2288 break; 2289 2290 case TOK_DSTPORT: 2291 p16 = &p.fs.flow_mask.dst_port; 2292 break; 2293 2294 case TOK_SRCPORT: 2295 p16 = &p.fs.flow_mask.src_port; 2296 break; 2297 2298 case TOK_PROTO: 2299 break; 2300 2301 default: 2302 ac++; av--; /* backtrack */ 2303 goto end_mask; 2304 } 2305 if (ac < 1) 2306 errx(EX_USAGE, "mask: value missing"); 2307 if (*av[0] == '/') { 2308 a = strtoul(av[0]+1, &end, 0); 2309 a = (a == 32) ? ~0 : (1 << a) - 1; 2310 } else 2311 a = strtoul(av[0], &end, 0); 2312 if (p32 != NULL) 2313 *p32 = a; 2314 else if (p16 != NULL) { 2315 if (a > 65535) 2316 errx(EX_DATAERR, 2317 "mask: must be 16 bit"); 2318 *p16 = (uint16_t)a; 2319 } else { 2320 if (a > 255) 2321 errx(EX_DATAERR, 2322 "mask: must be 8 bit"); 2323 p.fs.flow_mask.proto = (uint8_t)a; 2324 } 2325 if (a != 0) 2326 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2327 ac--; av++; 2328 } /* end while, config masks */ 2329end_mask: 2330 break; 2331 2332 case TOK_RED: 2333 case TOK_GRED: 2334 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2335 p.fs.flags_fs |= DN_IS_RED; 2336 if (tok == TOK_GRED) 2337 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2338 /* 2339 * the format for parameters is w_q/min_th/max_th/max_p 2340 */ 2341 if ((end = strsep(&av[0], "/"))) { 2342 double w_q = strtod(end, NULL); 2343 if (w_q > 1 || w_q <= 0) 2344 errx(EX_DATAERR, "0 < w_q <= 1"); 2345 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2346 } 2347 if ((end = strsep(&av[0], "/"))) { 2348 p.fs.min_th = strtoul(end, &end, 0); 2349 if (*end == 'K' || *end == 'k') 2350 p.fs.min_th *= 1024; 2351 } 2352 if ((end = strsep(&av[0], "/"))) { 2353 p.fs.max_th = strtoul(end, &end, 0); 2354 if (*end == 'K' || *end == 'k') 2355 p.fs.max_th *= 1024; 2356 } 2357 if ((end = strsep(&av[0], "/"))) { 2358 double max_p = strtod(end, NULL); 2359 if (max_p > 1 || max_p <= 0) 2360 errx(EX_DATAERR, "0 < max_p <= 1"); 2361 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2362 } 2363 ac--; av++; 2364 break; 2365 2366 case TOK_DROPTAIL: 2367 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2368 break; 2369 2370 case TOK_BW: 2371 NEED1("bw needs bandwidth or interface\n"); 2372 if (do_pipe != 1) 2373 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2374 /* 2375 * set clocking interface or bandwidth value 2376 */ 2377 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2378 int l = sizeof(p.if_name)-1; 2379 /* interface name */ 2380 strncpy(p.if_name, av[0], l); 2381 p.if_name[l] = '\0'; 2382 p.bandwidth = 0; 2383 } else { 2384 p.if_name[0] = '\0'; 2385 p.bandwidth = strtoul(av[0], &end, 0); 2386 if (*end == 'K' || *end == 'k') { 2387 end++; 2388 p.bandwidth *= 1000; 2389 } else if (*end == 'M') { 2390 end++; 2391 p.bandwidth *= 1000000; 2392 } 2393 if (*end == 'B' || !strncmp(end, "by", 2)) 2394 p.bandwidth *= 8; 2395 if (p.bandwidth < 0) 2396 errx(EX_DATAERR, "bandwidth too large"); 2397 } 2398 ac--; av++; 2399 break; 2400 2401 case TOK_DELAY: 2402 if (do_pipe != 1) 2403 errx(EX_DATAERR, "delay only valid for pipes"); 2404 NEED1("delay needs argument 0..10000ms\n"); 2405 p.delay = strtoul(av[0], NULL, 0); 2406 ac--; av++; 2407 break; 2408 2409 case TOK_WEIGHT: 2410 if (do_pipe == 1) 2411 errx(EX_DATAERR,"weight only valid for queues"); 2412 NEED1("weight needs argument 0..100\n"); 2413 p.fs.weight = strtoul(av[0], &end, 0); 2414 ac--; av++; 2415 break; 2416 2417 case TOK_PIPE: 2418 if (do_pipe == 1) 2419 errx(EX_DATAERR,"pipe only valid for queues"); 2420 NEED1("pipe needs pipe_number\n"); 2421 p.fs.parent_nr = strtoul(av[0], &end, 0); 2422 ac--; av++; 2423 break; 2424 2425 default: 2426 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 2427 } 2428 } 2429 if (do_pipe == 1) { 2430 if (p.pipe_nr == 0) 2431 errx(EX_DATAERR, "pipe_nr must be > 0"); 2432 if (p.delay > 10000) 2433 errx(EX_DATAERR, "delay must be < 10000"); 2434 } else { /* do_pipe == 2, queue */ 2435 if (p.fs.parent_nr == 0) 2436 errx(EX_DATAERR, "pipe must be > 0"); 2437 if (p.fs.weight >100) 2438 errx(EX_DATAERR, "weight must be <= 100"); 2439 } 2440 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2441 if (p.fs.qsize > 1024*1024) 2442 errx(EX_DATAERR, "queue size must be < 1MB"); 2443 } else { 2444 if (p.fs.qsize > 100) 2445 errx(EX_DATAERR, "2 <= queue size <= 100"); 2446 } 2447 if (p.fs.flags_fs & DN_IS_RED) { 2448 size_t len; 2449 int lookup_depth, avg_pkt_size; 2450 double s, idle, weight, w_q; 2451 struct clockinfo ck; 2452 int t; 2453 2454 if (p.fs.min_th >= p.fs.max_th) 2455 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2456 p.fs.min_th, p.fs.max_th); 2457 if (p.fs.max_th == 0) 2458 errx(EX_DATAERR, "max_th must be > 0"); 2459 2460 len = sizeof(int); 2461 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2462 &lookup_depth, &len, NULL, 0) == -1) 2463 2464 errx(1, "sysctlbyname(\"%s\")", 2465 "net.inet.ip.dummynet.red_lookup_depth"); 2466 if (lookup_depth == 0) 2467 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2468 " must be greater than zero"); 2469 2470 len = sizeof(int); 2471 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2472 &avg_pkt_size, &len, NULL, 0) == -1) 2473 2474 errx(1, "sysctlbyname(\"%s\")", 2475 "net.inet.ip.dummynet.red_avg_pkt_size"); 2476 if (avg_pkt_size == 0) 2477 errx(EX_DATAERR, 2478 "net.inet.ip.dummynet.red_avg_pkt_size must" 2479 " be greater than zero"); 2480 2481 len = sizeof(struct clockinfo); 2482 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2483 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2484 2485 /* 2486 * Ticks needed for sending a medium-sized packet. 2487 * Unfortunately, when we are configuring a WF2Q+ queue, we 2488 * do not have bandwidth information, because that is stored 2489 * in the parent pipe, and also we have multiple queues 2490 * competing for it. So we set s=0, which is not very 2491 * correct. But on the other hand, why do we want RED with 2492 * WF2Q+ ? 2493 */ 2494 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2495 s = 0; 2496 else 2497 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2498 2499 /* 2500 * max idle time (in ticks) before avg queue size becomes 0. 2501 * NOTA: (3/w_q) is approx the value x so that 2502 * (1-w_q)^x < 10^-3. 2503 */ 2504 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2505 idle = s * 3. / w_q; 2506 p.fs.lookup_step = (int)idle / lookup_depth; 2507 if (!p.fs.lookup_step) 2508 p.fs.lookup_step = 1; 2509 weight = 1 - w_q; 2510 for (t = p.fs.lookup_step; t > 0; --t) 2511 weight *= weight; 2512 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2513 } 2514 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2515 if (i) 2516 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2517} 2518 2519static void 2520get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) 2521{ 2522 int i, l; 2523 2524 for (i=0; i<6; i++) 2525 addr[i] = mask[i] = 0; 2526 if (!strcmp(p, "any")) 2527 return; 2528 2529 for (i=0; *p && i<6;i++, p++) { 2530 addr[i] = strtol(p, &p, 16); 2531 if (*p != ':') /* we start with the mask */ 2532 break; 2533 } 2534 if (*p == '/') { /* mask len */ 2535 l = strtol(p+1, &p, 0); 2536 for (i=0; l>0; l -=8, i++) 2537 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2538 } else if (*p == '&') { /* mask */ 2539 for (i=0, p++; *p && i<6;i++, p++) { 2540 mask[i] = strtol(p, &p, 16); 2541 if (*p != ':') 2542 break; 2543 } 2544 } else if (*p == '\0') { 2545 for (i=0; i<6; i++) 2546 mask[i] = 0xff; 2547 } 2548 for (i=0; i<6; i++) 2549 addr[i] &= mask[i]; 2550} 2551 2552/* 2553 * helper function, updates the pointer to cmd with the length 2554 * of the current command, and also cleans up the first word of 2555 * the new command in case it has been clobbered before. 2556 */ 2557static ipfw_insn * 2558next_cmd(ipfw_insn *cmd) 2559{ 2560 cmd += F_LEN(cmd); 2561 bzero(cmd, sizeof(*cmd)); 2562 return cmd; 2563} 2564 2565/* 2566 * Takes arguments and copies them into a comment 2567 */ 2568static void 2569fill_comment(ipfw_insn *cmd, int ac, char **av) 2570{ 2571 int i, l; 2572 char *p = (char *)(cmd + 1); 2573 2574 cmd->opcode = O_NOP; 2575 cmd->len = (cmd->len & (F_NOT | F_OR)); 2576 2577 /* Compute length of comment string. */ 2578 for (i = 0, l = 0; i < ac; i++) 2579 l += strlen(av[i]) + 1; 2580 if (l == 0) 2581 return; 2582 if (l > 84) 2583 errx(EX_DATAERR, 2584 "comment too long (max 80 chars)"); 2585 l = 1 + (l+3)/4; 2586 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2587 for (i = 0; i < ac; i++) { 2588 strcpy(p, av[i]); 2589 p += strlen(av[i]); 2590 *p++ = ' '; 2591 } 2592 *(--p) = '\0'; 2593} 2594 2595/* 2596 * A function to fill simple commands of size 1. 2597 * Existing flags are preserved. 2598 */ 2599static void 2600fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2601{ 2602 cmd->opcode = opcode; 2603 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2604 cmd->arg1 = arg; 2605} 2606 2607/* 2608 * Fetch and add the MAC address and type, with masks. This generates one or 2609 * two microinstructions, and returns the pointer to the last one. 2610 */ 2611static ipfw_insn * 2612add_mac(ipfw_insn *cmd, int ac, char *av[]) 2613{ 2614 ipfw_insn_mac *mac; 2615 2616 if (ac < 2) 2617 errx(EX_DATAERR, "MAC dst src"); 2618 2619 cmd->opcode = O_MACADDR2; 2620 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2621 2622 mac = (ipfw_insn_mac *)cmd; 2623 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2624 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2625 return cmd; 2626} 2627 2628static ipfw_insn * 2629add_mactype(ipfw_insn *cmd, int ac, char *av) 2630{ 2631 if (ac < 1) 2632 errx(EX_DATAERR, "missing MAC type"); 2633 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2634 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2635 cmd->opcode = O_MAC_TYPE; 2636 return cmd; 2637 } else 2638 return NULL; 2639} 2640 2641static ipfw_insn * 2642add_proto(ipfw_insn *cmd, char *av) 2643{ 2644 struct protoent *pe; 2645 u_char proto = 0; 2646 2647 if (!strncmp(av, "all", strlen(av))) 2648 ; /* same as "ip" */ 2649 else if ((proto = atoi(av)) > 0) 2650 ; /* all done! */ 2651 else if ((pe = getprotobyname(av)) != NULL) 2652 proto = pe->p_proto; 2653 else 2654 return NULL; 2655 if (proto != IPPROTO_IP) 2656 fill_cmd(cmd, O_PROTO, 0, proto); 2657 return cmd; 2658} 2659 2660static ipfw_insn * 2661add_srcip(ipfw_insn *cmd, char *av) 2662{ 2663 fill_ip((ipfw_insn_ip *)cmd, av); 2664 if (cmd->opcode == O_IP_DST_SET) /* set */ 2665 cmd->opcode = O_IP_SRC_SET; 2666 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2667 cmd->opcode = O_IP_SRC_ME; 2668 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2669 cmd->opcode = O_IP_SRC; 2670 else /* addr/mask */ 2671 cmd->opcode = O_IP_SRC_MASK; 2672 return cmd; 2673} 2674 2675static ipfw_insn * 2676add_dstip(ipfw_insn *cmd, char *av) 2677{ 2678 fill_ip((ipfw_insn_ip *)cmd, av); 2679 if (cmd->opcode == O_IP_DST_SET) /* set */ 2680 ; 2681 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2682 cmd->opcode = O_IP_DST_ME; 2683 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2684 cmd->opcode = O_IP_DST; 2685 else /* addr/mask */ 2686 cmd->opcode = O_IP_DST_MASK; 2687 return cmd; 2688} 2689 2690static ipfw_insn * 2691add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2692{ 2693 if (!strncmp(av, "any", strlen(av))) { 2694 return NULL; 2695 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2696 /* XXX todo: check that we have a protocol with ports */ 2697 cmd->opcode = opcode; 2698 return cmd; 2699 } 2700 return NULL; 2701} 2702 2703/* 2704 * Parse arguments and assemble the microinstructions which make up a rule. 2705 * Rules are added into the 'rulebuf' and then copied in the correct order 2706 * into the actual rule. 2707 * 2708 * The syntax for a rule starts with the action, followed by an 2709 * optional log action, and the various match patterns. 2710 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2711 * (generated if the rule includes a keep-state option), then the 2712 * various match patterns, the "log" action, and the actual action. 2713 * 2714 */ 2715static void 2716add(int ac, char *av[]) 2717{ 2718 /* 2719 * rules are added into the 'rulebuf' and then copied in 2720 * the correct order into the actual rule. 2721 * Some things that need to go out of order (prob, action etc.) 2722 * go into actbuf[]. 2723 */ 2724 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2725 2726 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2727 ipfw_insn *first_cmd; /* first match pattern */ 2728 2729 struct ip_fw *rule; 2730 2731 /* 2732 * various flags used to record that we entered some fields. 2733 */ 2734 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2735 2736 int i; 2737 2738 int open_par = 0; /* open parenthesis ( */ 2739 2740 /* proto is here because it is used to fetch ports */ 2741 u_char proto = IPPROTO_IP; /* default protocol */ 2742 2743 double match_prob = 1; /* match probability, default is always match */ 2744 2745 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2746 bzero(cmdbuf, sizeof(cmdbuf)); 2747 bzero(rulebuf, sizeof(rulebuf)); 2748 2749 rule = (struct ip_fw *)rulebuf; 2750 cmd = (ipfw_insn *)cmdbuf; 2751 action = (ipfw_insn *)actbuf; 2752 2753 av++; ac--; 2754 2755 /* [rule N] -- Rule number optional */ 2756 if (ac && isdigit(**av)) { 2757 rule->rulenum = atoi(*av); 2758 av++; 2759 ac--; 2760 } 2761 2762 /* [set N] -- set number (0..RESVD_SET), optional */ 2763 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2764 int set = strtoul(av[1], NULL, 10); 2765 if (set < 0 || set > RESVD_SET) 2766 errx(EX_DATAERR, "illegal set %s", av[1]); 2767 rule->set = set; 2768 av += 2; ac -= 2; 2769 } 2770 2771 /* [prob D] -- match probability, optional */ 2772 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2773 match_prob = strtod(av[1], NULL); 2774 2775 if (match_prob <= 0 || match_prob > 1) 2776 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2777 av += 2; ac -= 2; 2778 } 2779 2780 /* action -- mandatory */ 2781 NEED1("missing action"); 2782 i = match_token(rule_actions, *av); 2783 ac--; av++; 2784 action->len = 1; /* default */ 2785 switch(i) { 2786 case TOK_CHECKSTATE: 2787 have_state = action; 2788 action->opcode = O_CHECK_STATE; 2789 break; 2790 2791 case TOK_ACCEPT: 2792 action->opcode = O_ACCEPT; 2793 break; 2794 2795 case TOK_DENY: 2796 action->opcode = O_DENY; 2797 action->arg1 = 0; 2798 break; 2799 2800 case TOK_REJECT: 2801 action->opcode = O_REJECT; 2802 action->arg1 = ICMP_UNREACH_HOST; 2803 break; 2804 2805 case TOK_RESET: 2806 action->opcode = O_REJECT; 2807 action->arg1 = ICMP_REJECT_RST; 2808 break; 2809 2810 case TOK_UNREACH: 2811 action->opcode = O_REJECT; 2812 NEED1("missing reject code"); 2813 fill_reject_code(&action->arg1, *av); 2814 ac--; av++; 2815 break; 2816 2817 case TOK_COUNT: 2818 action->opcode = O_COUNT; 2819 break; 2820 2821 case TOK_QUEUE: 2822 case TOK_PIPE: 2823 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2824 case TOK_SKIPTO: 2825 if (i == TOK_QUEUE) 2826 action->opcode = O_QUEUE; 2827 else if (i == TOK_PIPE) 2828 action->opcode = O_PIPE; 2829 else if (i == TOK_SKIPTO) 2830 action->opcode = O_SKIPTO; 2831 NEED1("missing skipto/pipe/queue number"); 2832 action->arg1 = strtoul(*av, NULL, 10); 2833 av++; ac--; 2834 break; 2835 2836 case TOK_DIVERT: 2837 case TOK_TEE: 2838 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2839 NEED1("missing divert/tee port"); 2840 action->arg1 = strtoul(*av, NULL, 0); 2841 if (action->arg1 == 0) { 2842 struct servent *s; 2843 setservent(1); 2844 s = getservbyname(av[0], "divert"); 2845 if (s != NULL) 2846 action->arg1 = ntohs(s->s_port); 2847 else 2848 errx(EX_DATAERR, "illegal divert/tee port"); 2849 } 2850 ac--; av++; 2851 break; 2852 2853 case TOK_FORWARD: { 2854 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2855 char *s, *end; 2856 2857 NEED1("missing forward address[:port]"); 2858 2859 action->opcode = O_FORWARD_IP; 2860 action->len = F_INSN_SIZE(ipfw_insn_sa); 2861 2862 p->sa.sin_len = sizeof(struct sockaddr_in); 2863 p->sa.sin_family = AF_INET; 2864 p->sa.sin_port = 0; 2865 /* 2866 * locate the address-port separator (':' or ',') 2867 */ 2868 s = strchr(*av, ':'); 2869 if (s == NULL) 2870 s = strchr(*av, ','); 2871 if (s != NULL) { 2872 *(s++) = '\0'; 2873 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2874 if (s == end) 2875 errx(EX_DATAERR, 2876 "illegal forwarding port ``%s''", s); 2877 p->sa.sin_port = (u_short)i; 2878 } 2879 lookup_host(*av, &(p->sa.sin_addr)); 2880 } 2881 ac--; av++; 2882 break; 2883 2884 case TOK_COMMENT: 2885 /* pretend it is a 'count' rule followed by the comment */ 2886 action->opcode = O_COUNT; 2887 ac++; av--; /* go back... */ 2888 break; 2889 2890 default: 2891 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2892 } 2893 action = next_cmd(action); 2894 2895 /* 2896 * [log [logamount N]] -- log, optional 2897 * 2898 * If exists, it goes first in the cmdbuf, but then it is 2899 * skipped in the copy section to the end of the buffer. 2900 */ 2901 if (ac && !strncmp(*av, "log", strlen(*av))) { 2902 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2903 int l; 2904 2905 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2906 cmd->opcode = O_LOG; 2907 av++; ac--; 2908 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2909 ac--; av++; 2910 NEED1("logamount requires argument"); 2911 l = atoi(*av); 2912 if (l < 0) 2913 errx(EX_DATAERR, "logamount must be positive"); 2914 c->max_log = l; 2915 ac--; av++; 2916 } 2917 cmd = next_cmd(cmd); 2918 } 2919 2920 if (have_state) /* must be a check-state, we are done */ 2921 goto done; 2922 2923#define OR_START(target) \ 2924 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2925 if (open_par) \ 2926 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2927 prev = NULL; \ 2928 open_par = 1; \ 2929 if ( (av[0])[1] == '\0') { \ 2930 ac--; av++; \ 2931 } else \ 2932 (*av)++; \ 2933 } \ 2934 target: \ 2935 2936 2937#define CLOSE_PAR \ 2938 if (open_par) { \ 2939 if (ac && ( \ 2940 !strncmp(*av, ")", strlen(*av)) || \ 2941 !strncmp(*av, "}", strlen(*av)) )) { \ 2942 prev = NULL; \ 2943 open_par = 0; \ 2944 ac--; av++; \ 2945 } else \ 2946 errx(EX_USAGE, "missing \")\"\n"); \ 2947 } 2948 2949#define NOT_BLOCK \ 2950 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2951 if (cmd->len & F_NOT) \ 2952 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2953 cmd->len |= F_NOT; \ 2954 ac--; av++; \ 2955 } 2956 2957#define OR_BLOCK(target) \ 2958 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2959 if (prev == NULL || open_par == 0) \ 2960 errx(EX_DATAERR, "invalid OR block"); \ 2961 prev->len |= F_OR; \ 2962 ac--; av++; \ 2963 goto target; \ 2964 } \ 2965 CLOSE_PAR; 2966 2967 first_cmd = cmd; 2968 2969#if 0 2970 /* 2971 * MAC addresses, optional. 2972 * If we have this, we skip the part "proto from src to dst" 2973 * and jump straight to the option parsing. 2974 */ 2975 NOT_BLOCK; 2976 NEED1("missing protocol"); 2977 if (!strncmp(*av, "MAC", strlen(*av)) || 2978 !strncmp(*av, "mac", strlen(*av))) { 2979 ac--; av++; /* the "MAC" keyword */ 2980 add_mac(cmd, ac, av); /* exits in case of errors */ 2981 cmd = next_cmd(cmd); 2982 ac -= 2; av += 2; /* dst-mac and src-mac */ 2983 NOT_BLOCK; 2984 NEED1("missing mac type"); 2985 if (add_mactype(cmd, ac, av[0])) 2986 cmd = next_cmd(cmd); 2987 ac--; av++; /* any or mac-type */ 2988 goto read_options; 2989 } 2990#endif 2991 2992 /* 2993 * protocol, mandatory 2994 */ 2995 OR_START(get_proto); 2996 NOT_BLOCK; 2997 NEED1("missing protocol"); 2998 if (add_proto(cmd, *av)) { 2999 av++; ac--; 3000 if (F_LEN(cmd) == 0) /* plain IP */ 3001 proto = 0; 3002 else { 3003 proto = cmd->arg1; 3004 prev = cmd; 3005 cmd = next_cmd(cmd); 3006 } 3007 } else if (first_cmd != cmd) { 3008 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3009 } else 3010 goto read_options; 3011 OR_BLOCK(get_proto); 3012 3013 /* 3014 * "from", mandatory 3015 */ 3016 if (!ac || strncmp(*av, "from", strlen(*av))) 3017 errx(EX_USAGE, "missing ``from''"); 3018 ac--; av++; 3019 3020 /* 3021 * source IP, mandatory 3022 */ 3023 OR_START(source_ip); 3024 NOT_BLOCK; /* optional "not" */ 3025 NEED1("missing source address"); 3026 if (add_srcip(cmd, *av)) { 3027 ac--; av++; 3028 if (F_LEN(cmd) != 0) { /* ! any */ 3029 prev = cmd; 3030 cmd = next_cmd(cmd); 3031 } 3032 } 3033 OR_BLOCK(source_ip); 3034 3035 /* 3036 * source ports, optional 3037 */ 3038 NOT_BLOCK; /* optional "not" */ 3039 if (ac) { 3040 if (!strncmp(*av, "any", strlen(*av)) || 3041 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3042 ac--; av++; 3043 if (F_LEN(cmd) != 0) 3044 cmd = next_cmd(cmd); 3045 } 3046 } 3047 3048 /* 3049 * "to", mandatory 3050 */ 3051 if (!ac || strncmp(*av, "to", strlen(*av))) 3052 errx(EX_USAGE, "missing ``to''"); 3053 av++; ac--; 3054 3055 /* 3056 * destination, mandatory 3057 */ 3058 OR_START(dest_ip); 3059 NOT_BLOCK; /* optional "not" */ 3060 NEED1("missing dst address"); 3061 if (add_dstip(cmd, *av)) { 3062 ac--; av++; 3063 if (F_LEN(cmd) != 0) { /* ! any */ 3064 prev = cmd; 3065 cmd = next_cmd(cmd); 3066 } 3067 } 3068 OR_BLOCK(dest_ip); 3069 3070 /* 3071 * dest. ports, optional 3072 */ 3073 NOT_BLOCK; /* optional "not" */ 3074 if (ac) { 3075 if (!strncmp(*av, "any", strlen(*av)) || 3076 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3077 ac--; av++; 3078 if (F_LEN(cmd) != 0) 3079 cmd = next_cmd(cmd); 3080 } 3081 } 3082 3083read_options: 3084 if (ac && first_cmd == cmd) { 3085 /* 3086 * nothing specified so far, store in the rule to ease 3087 * printout later. 3088 */ 3089 rule->_pad = 1; 3090 } 3091 prev = NULL; 3092 while (ac) { 3093 char *s; 3094 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3095 3096 s = *av; 3097 cmd32 = (ipfw_insn_u32 *)cmd; 3098 3099 if (*s == '!') { /* alternate syntax for NOT */ 3100 if (cmd->len & F_NOT) 3101 errx(EX_USAGE, "double \"not\" not allowed\n"); 3102 cmd->len = F_NOT; 3103 s++; 3104 } 3105 i = match_token(rule_options, s); 3106 ac--; av++; 3107 switch(i) { 3108 case TOK_NOT: 3109 if (cmd->len & F_NOT) 3110 errx(EX_USAGE, "double \"not\" not allowed\n"); 3111 cmd->len = F_NOT; 3112 break; 3113 3114 case TOK_OR: 3115 if (open_par == 0 || prev == NULL) 3116 errx(EX_USAGE, "invalid \"or\" block\n"); 3117 prev->len |= F_OR; 3118 break; 3119 3120 case TOK_STARTBRACE: 3121 if (open_par) 3122 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3123 open_par = 1; 3124 break; 3125 3126 case TOK_ENDBRACE: 3127 if (!open_par) 3128 errx(EX_USAGE, "+missing \")\"\n"); 3129 open_par = 0; 3130 prev = NULL; 3131 break; 3132 3133 case TOK_IN: 3134 fill_cmd(cmd, O_IN, 0, 0); 3135 break; 3136 3137 case TOK_OUT: 3138 cmd->len ^= F_NOT; /* toggle F_NOT */ 3139 fill_cmd(cmd, O_IN, 0, 0); 3140 break; 3141 3142 case TOK_FRAG: 3143 fill_cmd(cmd, O_FRAG, 0, 0); 3144 break; 3145 3146 case TOK_LAYER2: 3147 fill_cmd(cmd, O_LAYER2, 0, 0); 3148 break; 3149 3150 case TOK_XMIT: 3151 case TOK_RECV: 3152 case TOK_VIA: 3153 NEED1("recv, xmit, via require interface name" 3154 " or address"); 3155 fill_iface((ipfw_insn_if *)cmd, av[0]); 3156 ac--; av++; 3157 if (F_LEN(cmd) == 0) /* not a valid address */ 3158 break; 3159 if (i == TOK_XMIT) 3160 cmd->opcode = O_XMIT; 3161 else if (i == TOK_RECV) 3162 cmd->opcode = O_RECV; 3163 else if (i == TOK_VIA) 3164 cmd->opcode = O_VIA; 3165 break; 3166 3167 case TOK_ICMPTYPES: 3168 NEED1("icmptypes requires list of types"); 3169 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3170 av++; ac--; 3171 break; 3172 3173 case TOK_IPTTL: 3174 NEED1("ipttl requires TTL"); 3175 if (strpbrk(*av, "-,")) { 3176 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3177 errx(EX_DATAERR, "invalid ipttl %s", *av); 3178 } else 3179 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3180 ac--; av++; 3181 break; 3182 3183 case TOK_IPID: 3184 NEED1("ipid requires id"); 3185 if (strpbrk(*av, "-,")) { 3186 if (!add_ports(cmd, *av, 0, O_IPID)) 3187 errx(EX_DATAERR, "invalid ipid %s", *av); 3188 } else 3189 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3190 ac--; av++; 3191 break; 3192 3193 case TOK_IPLEN: 3194 NEED1("iplen requires length"); 3195 if (strpbrk(*av, "-,")) { 3196 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3197 errx(EX_DATAERR, "invalid ip len %s", *av); 3198 } else 3199 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3200 ac--; av++; 3201 break; 3202 3203 case TOK_IPVER: 3204 NEED1("ipver requires version"); 3205 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3206 ac--; av++; 3207 break; 3208 3209 case TOK_IPPRECEDENCE: 3210 NEED1("ipprecedence requires value"); 3211 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3212 (strtoul(*av, NULL, 0) & 7) << 5); 3213 ac--; av++; 3214 break; 3215 3216 case TOK_IPOPTS: 3217 NEED1("missing argument for ipoptions"); 3218 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3219 ac--; av++; 3220 break; 3221 3222 case TOK_IPTOS: 3223 NEED1("missing argument for iptos"); 3224 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3225 ac--; av++; 3226 break; 3227 3228 case TOK_UID: 3229 NEED1("uid requires argument"); 3230 { 3231 char *end; 3232 uid_t uid; 3233 struct passwd *pwd; 3234 3235 cmd->opcode = O_UID; 3236 uid = strtoul(*av, &end, 0); 3237 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3238 if (pwd == NULL) 3239 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3240 cmd32->d[0] = pwd->pw_uid; 3241 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3242 ac--; av++; 3243 } 3244 break; 3245 3246 case TOK_GID: 3247 NEED1("gid requires argument"); 3248 { 3249 char *end; 3250 gid_t gid; 3251 struct group *grp; 3252 3253 cmd->opcode = O_GID; 3254 gid = strtoul(*av, &end, 0); 3255 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3256 if (grp == NULL) 3257 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3258 cmd32->d[0] = grp->gr_gid; 3259 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3260 ac--; av++; 3261 } 3262 break; 3263 3264 case TOK_ESTAB: 3265 fill_cmd(cmd, O_ESTAB, 0, 0); 3266 break; 3267 3268 case TOK_SETUP: 3269 fill_cmd(cmd, O_TCPFLAGS, 0, 3270 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3271 break; 3272 3273 case TOK_TCPOPTS: 3274 NEED1("missing argument for tcpoptions"); 3275 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3276 ac--; av++; 3277 break; 3278 3279 case TOK_TCPSEQ: 3280 case TOK_TCPACK: 3281 NEED1("tcpseq/tcpack requires argument"); 3282 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3283 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3284 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3285 ac--; av++; 3286 break; 3287 3288 case TOK_TCPWIN: 3289 NEED1("tcpwin requires length"); 3290 fill_cmd(cmd, O_TCPWIN, 0, 3291 htons(strtoul(*av, NULL, 0))); 3292 ac--; av++; 3293 break; 3294 3295 case TOK_TCPFLAGS: 3296 NEED1("missing argument for tcpflags"); 3297 cmd->opcode = O_TCPFLAGS; 3298 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3299 ac--; av++; 3300 break; 3301 3302 case TOK_KEEPSTATE: 3303 if (open_par) 3304 errx(EX_USAGE, "keep-state cannot be part " 3305 "of an or block"); 3306 if (have_state) 3307 errx(EX_USAGE, "only one of keep-state " 3308 "and limit is allowed"); 3309 have_state = cmd; 3310 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3311 break; 3312 3313 case TOK_LIMIT: 3314 if (open_par) 3315 errx(EX_USAGE, "limit cannot be part " 3316 "of an or block"); 3317 if (have_state) 3318 errx(EX_USAGE, "only one of keep-state " 3319 "and limit is allowed"); 3320 NEED1("limit needs mask and # of connections"); 3321 have_state = cmd; 3322 { 3323 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3324 3325 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3326 cmd->opcode = O_LIMIT; 3327 c->limit_mask = 0; 3328 c->conn_limit = 0; 3329 for (; ac >1 ;) { 3330 int val; 3331 3332 val = match_token(limit_masks, *av); 3333 if (val <= 0) 3334 break; 3335 c->limit_mask |= val; 3336 ac--; av++; 3337 } 3338 c->conn_limit = atoi(*av); 3339 if (c->conn_limit == 0) 3340 errx(EX_USAGE, "limit: limit must be >0"); 3341 if (c->limit_mask == 0) 3342 errx(EX_USAGE, "missing limit mask"); 3343 ac--; av++; 3344 } 3345 break; 3346 3347 case TOK_PROTO: 3348 NEED1("missing protocol"); 3349 if (add_proto(cmd, *av)) { 3350 proto = cmd->arg1; 3351 ac--; av++; 3352 } else 3353 errx(EX_DATAERR, "invalid protocol ``%s''", 3354 *av); 3355 break; 3356 3357 case TOK_SRCIP: 3358 NEED1("missing source IP"); 3359 if (add_srcip(cmd, *av)) { 3360 ac--; av++; 3361 } 3362 break; 3363 3364 case TOK_DSTIP: 3365 NEED1("missing destination IP"); 3366 if (add_dstip(cmd, *av)) { 3367 ac--; av++; 3368 } 3369 break; 3370 3371 case TOK_SRCPORT: 3372 NEED1("missing source port"); 3373 if (!strncmp(*av, "any", strlen(*av)) || 3374 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3375 ac--; av++; 3376 } else 3377 errx(EX_DATAERR, "invalid source port %s", *av); 3378 break; 3379 3380 case TOK_DSTPORT: 3381 NEED1("missing destination port"); 3382 if (!strncmp(*av, "any", strlen(*av)) || 3383 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3384 ac--; av++; 3385 } else 3386 errx(EX_DATAERR, "invalid destination port %s", 3387 *av); 3388 break; 3389 3390 case TOK_MAC: 3391 if (add_mac(cmd, ac, av)) { 3392 ac -= 2; av += 2; 3393 } 3394 break; 3395 3396 case TOK_MACTYPE: 3397 NEED1("missing mac type"); 3398 if (!add_mactype(cmd, ac, *av)) 3399 errx(EX_DATAERR, "invalid mac type %s", *av); 3400 ac--; av++; 3401 break; 3402 3403 case TOK_VERREVPATH: 3404 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3405 break; 3406 3407 case TOK_VERSRCREACH: 3408 fill_cmd(cmd, O_VERSRCREACH, 0, 0); 3409 break; 3410 3411 case TOK_IPSEC: 3412 fill_cmd(cmd, O_IPSEC, 0, 0); 3413 break; 3414 3415 case TOK_COMMENT: 3416 fill_comment(cmd, ac, av); 3417 av += ac; 3418 ac = 0; 3419 break; 3420 3421 default: 3422 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3423 } 3424 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3425 prev = cmd; 3426 cmd = next_cmd(cmd); 3427 } 3428 } 3429 3430done: 3431 /* 3432 * Now copy stuff into the rule. 3433 * If we have a keep-state option, the first instruction 3434 * must be a PROBE_STATE (which is generated here). 3435 * If we have a LOG option, it was stored as the first command, 3436 * and now must be moved to the top of the action part. 3437 */ 3438 dst = (ipfw_insn *)rule->cmd; 3439 3440 /* 3441 * First thing to write into the command stream is the match probability. 3442 */ 3443 if (match_prob != 1) { /* 1 means always match */ 3444 dst->opcode = O_PROB; 3445 dst->len = 2; 3446 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3447 dst += dst->len; 3448 } 3449 3450 /* 3451 * generate O_PROBE_STATE if necessary 3452 */ 3453 if (have_state && have_state->opcode != O_CHECK_STATE) { 3454 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3455 dst = next_cmd(dst); 3456 } 3457 /* 3458 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3459 */ 3460 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3461 i = F_LEN(src); 3462 3463 switch (src->opcode) { 3464 case O_LOG: 3465 case O_KEEP_STATE: 3466 case O_LIMIT: 3467 break; 3468 default: 3469 bcopy(src, dst, i * sizeof(uint32_t)); 3470 dst += i; 3471 } 3472 } 3473 3474 /* 3475 * put back the have_state command as last opcode 3476 */ 3477 if (have_state && have_state->opcode != O_CHECK_STATE) { 3478 i = F_LEN(have_state); 3479 bcopy(have_state, dst, i * sizeof(uint32_t)); 3480 dst += i; 3481 } 3482 /* 3483 * start action section 3484 */ 3485 rule->act_ofs = dst - rule->cmd; 3486 3487 /* 3488 * put back O_LOG if necessary 3489 */ 3490 src = (ipfw_insn *)cmdbuf; 3491 if (src->opcode == O_LOG) { 3492 i = F_LEN(src); 3493 bcopy(src, dst, i * sizeof(uint32_t)); 3494 dst += i; 3495 } 3496 /* 3497 * copy all other actions 3498 */ 3499 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3500 i = F_LEN(src); 3501 bcopy(src, dst, i * sizeof(uint32_t)); 3502 dst += i; 3503 } 3504 3505 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3506 i = (char *)dst - (char *)rule; 3507 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3508 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3509 if (!do_quiet) 3510 show_ipfw(rule, 0, 0); 3511} 3512 3513static void 3514zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3515{ 3516 int rulenum; 3517 int failed = EX_OK; 3518 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3519 3520 av++; ac--; 3521 3522 if (!ac) { 3523 /* clear all entries */ 3524 if (do_cmd(optname, NULL, 0) < 0) 3525 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3526 if (!do_quiet) 3527 printf("%s.\n", optname == IP_FW_ZERO ? 3528 "Accounting cleared":"Logging counts reset"); 3529 3530 return; 3531 } 3532 3533 while (ac) { 3534 /* Rule number */ 3535 if (isdigit(**av)) { 3536 rulenum = atoi(*av); 3537 av++; 3538 ac--; 3539 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3540 warn("rule %u: setsockopt(IP_FW_%s)", 3541 rulenum, name); 3542 failed = EX_UNAVAILABLE; 3543 } else if (!do_quiet) 3544 printf("Entry %d %s.\n", rulenum, 3545 optname == IP_FW_ZERO ? 3546 "cleared" : "logging count reset"); 3547 } else { 3548 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3549 } 3550 } 3551 if (failed != EX_OK) 3552 exit(failed); 3553} 3554 3555static void 3556flush(int force) 3557{ 3558 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3559 3560 if (!force && !do_quiet) { /* need to ask user */ 3561 int c; 3562 3563 printf("Are you sure? [yn] "); 3564 fflush(stdout); 3565 do { 3566 c = toupper(getc(stdin)); 3567 while (c != '\n' && getc(stdin) != '\n') 3568 if (feof(stdin)) 3569 return; /* and do not flush */ 3570 } while (c != 'Y' && c != 'N'); 3571 printf("\n"); 3572 if (c == 'N') /* user said no */ 3573 return; 3574 } 3575 if (do_cmd(cmd, NULL, 0) < 0) 3576 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3577 do_pipe ? "DUMMYNET" : "FW"); 3578 if (!do_quiet) 3579 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3580} 3581 3582/* 3583 * Free a the (locally allocated) copy of command line arguments. 3584 */ 3585static void 3586free_args(int ac, char **av) 3587{ 3588 int i; 3589 3590 for (i=0; i < ac; i++) 3591 free(av[i]); 3592 free(av); 3593} 3594 3595/* 3596 * Called with the arguments (excluding program name). 3597 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 3598 */ 3599static int 3600ipfw_main(int oldac, char **oldav) 3601{ 3602 int ch, ac, save_ac; 3603 char **av, **save_av; 3604 int do_acct = 0; /* Show packet/byte count */ 3605 3606#define WHITESP " \t\f\v\n\r" 3607 if (oldac == 0) 3608 return 1; 3609 else if (oldac == 1) { 3610 /* 3611 * If we are called with a single string, try to split it into 3612 * arguments for subsequent parsing. 3613 * But first, remove spaces after a ',', by copying the string 3614 * in-place. 3615 */ 3616 char *arg = oldav[0]; /* The string... */ 3617 int l = strlen(arg); 3618 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3619 int i, j; 3620 for (i = j = 0; i < l; i++) { 3621 if (arg[i] == '#') /* comment marker */ 3622 break; 3623 if (copy) { 3624 arg[j++] = arg[i]; 3625 copy = !index("," WHITESP, arg[i]); 3626 } else { 3627 copy = !index(WHITESP, arg[i]); 3628 if (copy) 3629 arg[j++] = arg[i]; 3630 } 3631 } 3632 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3633 j--; 3634 l = j; /* the new argument length */ 3635 arg[j++] = '\0'; 3636 if (l == 0) /* empty string! */ 3637 return 1; 3638 3639 /* 3640 * First, count number of arguments. Because of the previous 3641 * processing, this is just the number of blanks plus 1. 3642 */ 3643 for (i = 0, ac = 1; i < l; i++) 3644 if (index(WHITESP, arg[i]) != NULL) 3645 ac++; 3646 3647 av = calloc(ac, sizeof(char *)); 3648 3649 /* 3650 * Second, copy arguments from cmd[] to av[]. For each one, 3651 * j is the initial character, i is the one past the end. 3652 */ 3653 for (ac = 0, i = j = 0; i < l; i++) 3654 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3655 if (i == l-1) 3656 i++; 3657 av[ac] = calloc(i-j+1, 1); 3658 bcopy(arg+j, av[ac], i-j); 3659 ac++; 3660 j = i + 1; 3661 } 3662 } else { 3663 /* 3664 * If an argument ends with ',' join with the next one. 3665 */ 3666 int first, i, l; 3667 3668 av = calloc(oldac, sizeof(char *)); 3669 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3670 char *arg = oldav[i]; 3671 int k = strlen(arg); 3672 3673 l += k; 3674 if (arg[k-1] != ',' || i == oldac-1) { 3675 /* Time to copy. */ 3676 av[ac] = calloc(l+1, 1); 3677 for (l=0; first <= i; first++) { 3678 strcat(av[ac]+l, oldav[first]); 3679 l += strlen(oldav[first]); 3680 } 3681 ac++; 3682 l = 0; 3683 first = i+1; 3684 } 3685 } 3686 } 3687 3688 /* Set the force flag for non-interactive processes */ 3689 if (!do_force) 3690 do_force = !isatty(STDIN_FILENO); 3691 3692 /* Save arguments for final freeing of memory. */ 3693 save_ac = ac; 3694 save_av = av; 3695 3696 optind = optreset = 0; 3697 while ((ch = getopt(ac, av, "abcdefhnNqs:STtv")) != -1) 3698 switch (ch) { 3699 case 'a': 3700 do_acct = 1; 3701 break; 3702 3703 case 'b': 3704 comment_only = 1; 3705 do_compact = 1; 3706 break; 3707 3708 case 'c': 3709 do_compact = 1; 3710 break; 3711 3712 case 'd': 3713 do_dynamic = 1; 3714 break; 3715 3716 case 'e': 3717 do_expired = 1; 3718 break; 3719 3720 case 'f': 3721 do_force = 1; 3722 break; 3723 3724 case 'h': /* help */ 3725 free_args(save_ac, save_av); 3726 help(); 3727 break; /* NOTREACHED */ 3728 3729 case 'n': 3730 test_only = 1; 3731 break; 3732 3733 case 'N': 3734 do_resolv = 1; 3735 break; 3736 3737 case 'q': 3738 do_quiet = 1; 3739 break; 3740 3741 case 's': /* sort */ 3742 do_sort = atoi(optarg); 3743 break; 3744 3745 case 'S': 3746 show_sets = 1; 3747 break; 3748 3749 case 't': 3750 do_time = 1; 3751 break; 3752 3753 case 'T': 3754 do_time = 2; /* numeric timestamp */ 3755 break; 3756 3757 case 'v': /* verbose */ 3758 verbose = 1; 3759 break; 3760 3761 default: 3762 free_args(save_ac, save_av); 3763 return 1; 3764 } 3765 3766 ac -= optind; 3767 av += optind; 3768 NEED1("bad arguments, for usage summary ``ipfw''"); 3769 3770 /* 3771 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 3772 * e.g. "100 add allow ..." instead of "add 100 allow ...". 3773 * In case, swap first and second argument to get the normal form. 3774 */ 3775 if (ac > 1 && isdigit(*av[0])) { 3776 char *p = av[0]; 3777 3778 av[0] = av[1]; 3779 av[1] = p; 3780 } 3781 3782 /* 3783 * optional: pipe or queue 3784 */ 3785 do_pipe = 0; 3786 if (!strncmp(*av, "pipe", strlen(*av))) 3787 do_pipe = 1; 3788 else if (!strncmp(*av, "queue", strlen(*av))) 3789 do_pipe = 2; 3790 if (do_pipe) { 3791 ac--; 3792 av++; 3793 } 3794 NEED1("missing command"); 3795 3796 /* 3797 * For pipes and queues we normally say 'pipe NN config' 3798 * but the code is easier to parse as 'pipe config NN' 3799 * so we swap the two arguments. 3800 */ 3801 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3802 char *p = av[0]; 3803 3804 av[0] = av[1]; 3805 av[1] = p; 3806 } 3807 3808 if (!strncmp(*av, "add", strlen(*av))) 3809 add(ac, av); 3810 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3811 config_pipe(ac, av); 3812 else if (!strncmp(*av, "delete", strlen(*av))) 3813 delete(ac, av); 3814 else if (!strncmp(*av, "flush", strlen(*av))) 3815 flush(do_force); 3816 else if (!strncmp(*av, "zero", strlen(*av))) 3817 zero(ac, av, IP_FW_ZERO); 3818 else if (!strncmp(*av, "resetlog", strlen(*av))) 3819 zero(ac, av, IP_FW_RESETLOG); 3820 else if (!strncmp(*av, "print", strlen(*av)) || 3821 !strncmp(*av, "list", strlen(*av))) 3822 list(ac, av, do_acct); 3823 else if (!strncmp(*av, "set", strlen(*av))) 3824 sets_handler(ac, av); 3825 else if (!strncmp(*av, "enable", strlen(*av))) 3826 sysctl_handler(ac, av, 1); 3827 else if (!strncmp(*av, "disable", strlen(*av))) 3828 sysctl_handler(ac, av, 0); 3829 else if (!strncmp(*av, "show", strlen(*av))) 3830 list(ac, av, 1 /* show counters */); 3831 else 3832 errx(EX_USAGE, "bad command `%s'", *av); 3833 3834 /* Free memory allocated in the argument parsing. */ 3835 free_args(save_ac, save_av); 3836 return 0; 3837} 3838 3839 3840static void 3841ipfw_readfile(int ac, char *av[]) 3842{ 3843#define MAX_ARGS 32 3844 char buf[BUFSIZ]; 3845 char *cmd = NULL, *filename = av[ac-1]; 3846 int c, lineno=0; 3847 FILE *f = NULL; 3848 pid_t preproc = 0; 3849 3850 filename = av[ac-1]; 3851 3852 while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { 3853 switch(c) { 3854 case 'c': 3855 do_compact = 1; 3856 break; 3857 3858 case 'f': 3859 do_force = 1; 3860 break; 3861 3862 case 'N': 3863 do_resolv = 1; 3864 break; 3865 3866 case 'n': 3867 test_only = 1; 3868 break; 3869 3870 case 'p': 3871 cmd = optarg; 3872 /* 3873 * Skip previous args and delete last one, so we 3874 * pass all but the last argument to the preprocessor 3875 * via av[optind-1] 3876 */ 3877 av += optind - 1; 3878 ac -= optind - 1; 3879 av[ac-1] = NULL; 3880 fprintf(stderr, "command is %s\n", av[0]); 3881 break; 3882 3883 case 'q': 3884 do_quiet = 1; 3885 break; 3886 3887 case 'S': 3888 show_sets = 1; 3889 break; 3890 3891 default: 3892 errx(EX_USAGE, "bad arguments, for usage" 3893 " summary ``ipfw''"); 3894 } 3895 3896 if (cmd != NULL) 3897 break; 3898 } 3899 3900 if (cmd == NULL && ac != optind + 1) { 3901 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 3902 errx(EX_USAGE, "extraneous filename arguments"); 3903 } 3904 3905 if ((f = fopen(filename, "r")) == NULL) 3906 err(EX_UNAVAILABLE, "fopen: %s", filename); 3907 3908 if (cmd != NULL) { /* pipe through preprocessor */ 3909 int pipedes[2]; 3910 3911 if (pipe(pipedes) == -1) 3912 err(EX_OSERR, "cannot create pipe"); 3913 3914 preproc = fork(); 3915 if (preproc == -1) 3916 err(EX_OSERR, "cannot fork"); 3917 3918 if (preproc == 0) { 3919 /* 3920 * Child, will run the preprocessor with the 3921 * file on stdin and the pipe on stdout. 3922 */ 3923 if (dup2(fileno(f), 0) == -1 3924 || dup2(pipedes[1], 1) == -1) 3925 err(EX_OSERR, "dup2()"); 3926 fclose(f); 3927 close(pipedes[1]); 3928 close(pipedes[0]); 3929 execvp(cmd, av); 3930 err(EX_OSERR, "execvp(%s) failed", cmd); 3931 } else { /* parent, will reopen f as the pipe */ 3932 fclose(f); 3933 close(pipedes[1]); 3934 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3935 int savederrno = errno; 3936 3937 (void)kill(preproc, SIGTERM); 3938 errno = savederrno; 3939 err(EX_OSERR, "fdopen()"); 3940 } 3941 } 3942 } 3943 3944 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 3945 char linename[10]; 3946 char *args[1]; 3947 3948 lineno++; 3949 sprintf(linename, "Line %d", lineno); 3950 setprogname(linename); /* XXX */ 3951 args[0] = buf; 3952 ipfw_main(1, args); 3953 } 3954 fclose(f); 3955 if (cmd != NULL) { 3956 int status; 3957 3958 if (waitpid(preproc, &status, 0) == -1) 3959 errx(EX_OSERR, "waitpid()"); 3960 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3961 errx(EX_UNAVAILABLE, 3962 "preprocessor exited with status %d", 3963 WEXITSTATUS(status)); 3964 else if (WIFSIGNALED(status)) 3965 errx(EX_UNAVAILABLE, 3966 "preprocessor exited with signal %d", 3967 WTERMSIG(status)); 3968 } 3969} 3970 3971int 3972main(int ac, char *av[]) 3973{ 3974 /* 3975 * If the last argument is an absolute pathname, interpret it 3976 * as a file to be preprocessed. 3977 */ 3978 3979 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3980 ipfw_readfile(ac, av); 3981 else { 3982 if (ipfw_main(ac-1, av+1)) 3983 show_usage(); 3984 } 3985 return EX_OK; 3986} 3987