ipfw2.c revision 120715
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 120715 2003-10-03 21:01:48Z sam $ 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 show_sets, /* display rule sets */ 67 test_only, /* only check syntax */ 68 verbose; 69 70#define IP_MASK_ALL 0xffffffff 71 72/* 73 * _s_x is a structure that stores a string <-> token pairs, used in 74 * various places in the parser. Entries are stored in arrays, 75 * with an entry with s=NULL as terminator. 76 * The search routines are match_token() and match_value(). 77 * Often, an element with x=0 contains an error string. 78 * 79 */ 80struct _s_x { 81 char const *s; 82 int x; 83}; 84 85static struct _s_x f_tcpflags[] = { 86 { "syn", TH_SYN }, 87 { "fin", TH_FIN }, 88 { "ack", TH_ACK }, 89 { "psh", TH_PUSH }, 90 { "rst", TH_RST }, 91 { "urg", TH_URG }, 92 { "tcp flag", 0 }, 93 { NULL, 0 } 94}; 95 96static struct _s_x f_tcpopts[] = { 97 { "mss", IP_FW_TCPOPT_MSS }, 98 { "maxseg", IP_FW_TCPOPT_MSS }, 99 { "window", IP_FW_TCPOPT_WINDOW }, 100 { "sack", IP_FW_TCPOPT_SACK }, 101 { "ts", IP_FW_TCPOPT_TS }, 102 { "timestamp", IP_FW_TCPOPT_TS }, 103 { "cc", IP_FW_TCPOPT_CC }, 104 { "tcp option", 0 }, 105 { NULL, 0 } 106}; 107 108/* 109 * IP options span the range 0 to 255 so we need to remap them 110 * (though in fact only the low 5 bits are significant). 111 */ 112static struct _s_x f_ipopts[] = { 113 { "ssrr", IP_FW_IPOPT_SSRR}, 114 { "lsrr", IP_FW_IPOPT_LSRR}, 115 { "rr", IP_FW_IPOPT_RR}, 116 { "ts", IP_FW_IPOPT_TS}, 117 { "ip option", 0 }, 118 { NULL, 0 } 119}; 120 121static struct _s_x f_iptos[] = { 122 { "lowdelay", IPTOS_LOWDELAY}, 123 { "throughput", IPTOS_THROUGHPUT}, 124 { "reliability", IPTOS_RELIABILITY}, 125 { "mincost", IPTOS_MINCOST}, 126 { "congestion", IPTOS_CE}, 127 { "ecntransport", IPTOS_ECT}, 128 { "ip tos option", 0}, 129 { NULL, 0 } 130}; 131 132static struct _s_x limit_masks[] = { 133 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 134 {"src-addr", DYN_SRC_ADDR}, 135 {"src-port", DYN_SRC_PORT}, 136 {"dst-addr", DYN_DST_ADDR}, 137 {"dst-port", DYN_DST_PORT}, 138 {NULL, 0} 139}; 140 141/* 142 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 143 * This is only used in this code. 144 */ 145#define IPPROTO_ETHERTYPE 0x1000 146static struct _s_x ether_types[] = { 147 /* 148 * Note, we cannot use "-:&/" in the names because they are field 149 * separators in the type specifications. Also, we use s = NULL as 150 * end-delimiter, because a type of 0 can be legal. 151 */ 152 { "ip", 0x0800 }, 153 { "ipv4", 0x0800 }, 154 { "ipv6", 0x86dd }, 155 { "arp", 0x0806 }, 156 { "rarp", 0x8035 }, 157 { "vlan", 0x8100 }, 158 { "loop", 0x9000 }, 159 { "trail", 0x1000 }, 160 { "at", 0x809b }, 161 { "atalk", 0x809b }, 162 { "aarp", 0x80f3 }, 163 { "pppoe_disc", 0x8863 }, 164 { "pppoe_sess", 0x8864 }, 165 { "ipx_8022", 0x00E0 }, 166 { "ipx_8023", 0x0000 }, 167 { "ipx_ii", 0x8137 }, 168 { "ipx_snap", 0x8137 }, 169 { "ipx", 0x8137 }, 170 { "ns", 0x0600 }, 171 { NULL, 0 } 172}; 173 174static void show_usage(void); 175 176enum tokens { 177 TOK_NULL=0, 178 179 TOK_OR, 180 TOK_NOT, 181 TOK_STARTBRACE, 182 TOK_ENDBRACE, 183 184 TOK_ACCEPT, 185 TOK_COUNT, 186 TOK_PIPE, 187 TOK_QUEUE, 188 TOK_DIVERT, 189 TOK_TEE, 190 TOK_FORWARD, 191 TOK_SKIPTO, 192 TOK_DENY, 193 TOK_REJECT, 194 TOK_RESET, 195 TOK_UNREACH, 196 TOK_CHECKSTATE, 197 198 TOK_UID, 199 TOK_GID, 200 TOK_IN, 201 TOK_LIMIT, 202 TOK_KEEPSTATE, 203 TOK_LAYER2, 204 TOK_OUT, 205 TOK_XMIT, 206 TOK_RECV, 207 TOK_VIA, 208 TOK_FRAG, 209 TOK_IPOPTS, 210 TOK_IPLEN, 211 TOK_IPID, 212 TOK_IPPRECEDENCE, 213 TOK_IPTOS, 214 TOK_IPTTL, 215 TOK_IPVER, 216 TOK_ESTAB, 217 TOK_SETUP, 218 TOK_TCPFLAGS, 219 TOK_TCPOPTS, 220 TOK_TCPSEQ, 221 TOK_TCPACK, 222 TOK_TCPWIN, 223 TOK_ICMPTYPES, 224 TOK_MAC, 225 TOK_MACTYPE, 226 TOK_VERREVPATH, 227 TOK_IPSEC, 228 TOK_COMMENT, 229 230 TOK_PLR, 231 TOK_NOERROR, 232 TOK_BUCKETS, 233 TOK_DSTIP, 234 TOK_SRCIP, 235 TOK_DSTPORT, 236 TOK_SRCPORT, 237 TOK_ALL, 238 TOK_MASK, 239 TOK_BW, 240 TOK_DELAY, 241 TOK_RED, 242 TOK_GRED, 243 TOK_DROPTAIL, 244 TOK_PROTO, 245 TOK_WEIGHT, 246}; 247 248struct _s_x dummynet_params[] = { 249 { "plr", TOK_PLR }, 250 { "noerror", TOK_NOERROR }, 251 { "buckets", TOK_BUCKETS }, 252 { "dst-ip", TOK_DSTIP }, 253 { "src-ip", TOK_SRCIP }, 254 { "dst-port", TOK_DSTPORT }, 255 { "src-port", TOK_SRCPORT }, 256 { "proto", TOK_PROTO }, 257 { "weight", TOK_WEIGHT }, 258 { "all", TOK_ALL }, 259 { "mask", TOK_MASK }, 260 { "droptail", TOK_DROPTAIL }, 261 { "red", TOK_RED }, 262 { "gred", TOK_GRED }, 263 { "bw", TOK_BW }, 264 { "bandwidth", TOK_BW }, 265 { "delay", TOK_DELAY }, 266 { "pipe", TOK_PIPE }, 267 { "queue", TOK_QUEUE }, 268 { "dummynet-params", TOK_NULL }, 269 { NULL, 0 } /* terminator */ 270}; 271 272struct _s_x rule_actions[] = { 273 { "accept", TOK_ACCEPT }, 274 { "pass", TOK_ACCEPT }, 275 { "allow", TOK_ACCEPT }, 276 { "permit", TOK_ACCEPT }, 277 { "count", TOK_COUNT }, 278 { "pipe", TOK_PIPE }, 279 { "queue", TOK_QUEUE }, 280 { "divert", TOK_DIVERT }, 281 { "tee", TOK_TEE }, 282 { "fwd", TOK_FORWARD }, 283 { "forward", TOK_FORWARD }, 284 { "skipto", TOK_SKIPTO }, 285 { "deny", TOK_DENY }, 286 { "drop", TOK_DENY }, 287 { "reject", TOK_REJECT }, 288 { "reset", TOK_RESET }, 289 { "unreach", TOK_UNREACH }, 290 { "check-state", TOK_CHECKSTATE }, 291 { "//", TOK_COMMENT }, 292 { NULL, 0 } /* terminator */ 293}; 294 295struct _s_x rule_options[] = { 296 { "uid", TOK_UID }, 297 { "gid", TOK_GID }, 298 { "in", TOK_IN }, 299 { "limit", TOK_LIMIT }, 300 { "keep-state", TOK_KEEPSTATE }, 301 { "bridged", TOK_LAYER2 }, 302 { "layer2", TOK_LAYER2 }, 303 { "out", TOK_OUT }, 304 { "xmit", TOK_XMIT }, 305 { "recv", TOK_RECV }, 306 { "via", TOK_VIA }, 307 { "fragment", TOK_FRAG }, 308 { "frag", TOK_FRAG }, 309 { "ipoptions", TOK_IPOPTS }, 310 { "ipopts", TOK_IPOPTS }, 311 { "iplen", TOK_IPLEN }, 312 { "ipid", TOK_IPID }, 313 { "ipprecedence", TOK_IPPRECEDENCE }, 314 { "iptos", TOK_IPTOS }, 315 { "ipttl", TOK_IPTTL }, 316 { "ipversion", TOK_IPVER }, 317 { "ipver", TOK_IPVER }, 318 { "estab", TOK_ESTAB }, 319 { "established", TOK_ESTAB }, 320 { "setup", TOK_SETUP }, 321 { "tcpflags", TOK_TCPFLAGS }, 322 { "tcpflgs", TOK_TCPFLAGS }, 323 { "tcpoptions", TOK_TCPOPTS }, 324 { "tcpopts", TOK_TCPOPTS }, 325 { "tcpseq", TOK_TCPSEQ }, 326 { "tcpack", TOK_TCPACK }, 327 { "tcpwin", TOK_TCPWIN }, 328 { "icmptype", TOK_ICMPTYPES }, 329 { "icmptypes", TOK_ICMPTYPES }, 330 { "dst-ip", TOK_DSTIP }, 331 { "src-ip", TOK_SRCIP }, 332 { "dst-port", TOK_DSTPORT }, 333 { "src-port", TOK_SRCPORT }, 334 { "proto", TOK_PROTO }, 335 { "MAC", TOK_MAC }, 336 { "mac", TOK_MAC }, 337 { "mac-type", TOK_MACTYPE }, 338 { "verrevpath", TOK_VERREVPATH }, 339 { "ipsec", TOK_IPSEC }, 340 { "//", TOK_COMMENT }, 341 342 { "not", TOK_NOT }, /* pseudo option */ 343 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 344 { "or", TOK_OR }, /* pseudo option */ 345 { "|", /* escape */ TOK_OR }, /* pseudo option */ 346 { "{", TOK_STARTBRACE }, /* pseudo option */ 347 { "(", TOK_STARTBRACE }, /* pseudo option */ 348 { "}", TOK_ENDBRACE }, /* pseudo option */ 349 { ")", TOK_ENDBRACE }, /* pseudo option */ 350 { NULL, 0 } /* terminator */ 351}; 352 353static __inline uint64_t 354align_uint64(uint64_t *pll) { 355 uint64_t ret; 356 357 bcopy (pll, &ret, sizeof(ret)); 358 return ret; 359}; 360 361/* 362 * conditionally runs the command. 363 */ 364static int 365do_cmd(int optname, void *optval, uintptr_t optlen) 366{ 367 static int s = -1; /* the socket */ 368 int i; 369 370 if (test_only) 371 return 0; 372 373 if (s == -1) 374 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 375 if (s < 0) 376 err(EX_UNAVAILABLE, "socket"); 377 378 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 379 optname == IP_FW_ADD) 380 i = getsockopt(s, IPPROTO_IP, optname, optval, 381 (socklen_t *)optlen); 382 else 383 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 384 return i; 385} 386 387/** 388 * match_token takes a table and a string, returns the value associated 389 * with the string (-1 in case of failure). 390 */ 391static int 392match_token(struct _s_x *table, char *string) 393{ 394 struct _s_x *pt; 395 uint i = strlen(string); 396 397 for (pt = table ; i && pt->s != NULL ; pt++) 398 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 399 return pt->x; 400 return -1; 401}; 402 403/** 404 * match_value takes a table and a value, returns the string associated 405 * with the value (NULL in case of failure). 406 */ 407static char const * 408match_value(struct _s_x *p, int value) 409{ 410 for (; p->s != NULL; p++) 411 if (p->x == value) 412 return p->s; 413 return NULL; 414} 415 416/* 417 * prints one port, symbolic or numeric 418 */ 419static void 420print_port(int proto, uint16_t port) 421{ 422 423 if (proto == IPPROTO_ETHERTYPE) { 424 char const *s; 425 426 if (do_resolv && (s = match_value(ether_types, port)) ) 427 printf("%s", s); 428 else 429 printf("0x%04x", port); 430 } else { 431 struct servent *se = NULL; 432 if (do_resolv) { 433 struct protoent *pe = getprotobynumber(proto); 434 435 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 436 } 437 if (se) 438 printf("%s", se->s_name); 439 else 440 printf("%d", port); 441 } 442} 443 444struct _s_x _port_name[] = { 445 {"dst-port", O_IP_DSTPORT}, 446 {"src-port", O_IP_SRCPORT}, 447 {"ipid", O_IPID}, 448 {"iplen", O_IPLEN}, 449 {"ipttl", O_IPTTL}, 450 {"mac-type", O_MAC_TYPE}, 451 {NULL, 0} 452}; 453 454/* 455 * Print the values in a list 16-bit items of the types above. 456 * XXX todo: add support for mask. 457 */ 458static void 459print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 460{ 461 uint16_t *p = cmd->ports; 462 int i; 463 char const *sep; 464 465 if (cmd->o.len & F_NOT) 466 printf(" not"); 467 if (opcode != 0) { 468 sep = match_value(_port_name, opcode); 469 if (sep == NULL) 470 sep = "???"; 471 printf (" %s", sep); 472 } 473 sep = " "; 474 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 475 printf(sep); 476 print_port(proto, p[0]); 477 if (p[0] != p[1]) { 478 printf("-"); 479 print_port(proto, p[1]); 480 } 481 sep = ","; 482 } 483} 484 485/* 486 * Like strtol, but also translates service names into port numbers 487 * for some protocols. 488 * In particular: 489 * proto == -1 disables the protocol check; 490 * proto == IPPROTO_ETHERTYPE looks up an internal table 491 * proto == <some value in /etc/protocols> matches the values there. 492 * Returns *end == s in case the parameter is not found. 493 */ 494static int 495strtoport(char *s, char **end, int base, int proto) 496{ 497 char *p, *buf; 498 char *s1; 499 int i; 500 501 *end = s; /* default - not found */ 502 if (*s == '\0') 503 return 0; /* not found */ 504 505 if (isdigit(*s)) 506 return strtol(s, end, base); 507 508 /* 509 * find separator. '\\' escapes the next char. 510 */ 511 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 512 if (*s1 == '\\' && s1[1] != '\0') 513 s1++; 514 515 buf = malloc(s1 - s + 1); 516 if (buf == NULL) 517 return 0; 518 519 /* 520 * copy into a buffer skipping backslashes 521 */ 522 for (p = s, i = 0; p != s1 ; p++) 523 if (*p != '\\') 524 buf[i++] = *p; 525 buf[i++] = '\0'; 526 527 if (proto == IPPROTO_ETHERTYPE) { 528 i = match_token(ether_types, buf); 529 free(buf); 530 if (i != -1) { /* found */ 531 *end = s1; 532 return i; 533 } 534 } else { 535 struct protoent *pe = NULL; 536 struct servent *se; 537 538 if (proto != 0) 539 pe = getprotobynumber(proto); 540 setservent(1); 541 se = getservbyname(buf, pe ? pe->p_name : NULL); 542 free(buf); 543 if (se != NULL) { 544 *end = s1; 545 return ntohs(se->s_port); 546 } 547 } 548 return 0; /* not found */ 549} 550 551/* 552 * Fill the body of the command with the list of port ranges. 553 */ 554static int 555fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 556{ 557 uint16_t a, b, *p = cmd->ports; 558 int i = 0; 559 char *s = av; 560 561 while (*s) { 562 a = strtoport(av, &s, 0, proto); 563 if (s == av) /* no parameter */ 564 break; 565 if (*s == '-') { /* a range */ 566 av = s+1; 567 b = strtoport(av, &s, 0, proto); 568 if (s == av) /* no parameter */ 569 break; 570 p[0] = a; 571 p[1] = b; 572 } else if (*s == ',' || *s == '\0' ) 573 p[0] = p[1] = a; 574 else /* invalid separator */ 575 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 576 *s, av); 577 i++; 578 p += 2; 579 av = s+1; 580 } 581 if (i > 0) { 582 if (i+1 > F_LEN_MASK) 583 errx(EX_DATAERR, "too many ports/ranges\n"); 584 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 585 } 586 return i; 587} 588 589static struct _s_x icmpcodes[] = { 590 { "net", ICMP_UNREACH_NET }, 591 { "host", ICMP_UNREACH_HOST }, 592 { "protocol", ICMP_UNREACH_PROTOCOL }, 593 { "port", ICMP_UNREACH_PORT }, 594 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 595 { "srcfail", ICMP_UNREACH_SRCFAIL }, 596 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 597 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 598 { "isolated", ICMP_UNREACH_ISOLATED }, 599 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 600 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 601 { "tosnet", ICMP_UNREACH_TOSNET }, 602 { "toshost", ICMP_UNREACH_TOSHOST }, 603 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 604 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 605 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 606 { NULL, 0 } 607}; 608 609static void 610fill_reject_code(u_short *codep, char *str) 611{ 612 int val; 613 char *s; 614 615 val = strtoul(str, &s, 0); 616 if (s == str || *s != '\0' || val >= 0x100) 617 val = match_token(icmpcodes, str); 618 if (val < 0) 619 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 620 *codep = val; 621 return; 622} 623 624static void 625print_reject_code(uint16_t code) 626{ 627 char const *s = match_value(icmpcodes, code); 628 629 if (s != NULL) 630 printf("unreach %s", s); 631 else 632 printf("unreach %u", code); 633} 634 635/* 636 * Returns the number of bits set (from left) in a contiguous bitmask, 637 * or -1 if the mask is not contiguous. 638 * XXX this needs a proper fix. 639 * This effectively works on masks in big-endian (network) format. 640 * when compiled on little endian architectures. 641 * 642 * First bit is bit 7 of the first byte -- note, for MAC addresses, 643 * the first bit on the wire is bit 0 of the first byte. 644 * len is the max length in bits. 645 */ 646static int 647contigmask(uint8_t *p, int len) 648{ 649 int i, n; 650 651 for (i=0; i<len ; i++) 652 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 653 break; 654 for (n=i+1; n < len; n++) 655 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 656 return -1; /* mask not contiguous */ 657 return i; 658} 659 660/* 661 * print flags set/clear in the two bitmasks passed as parameters. 662 * There is a specialized check for f_tcpflags. 663 */ 664static void 665print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 666{ 667 char const *comma = ""; 668 int i; 669 uint8_t set = cmd->arg1 & 0xff; 670 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 671 672 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 673 printf(" setup"); 674 return; 675 } 676 677 printf(" %s ", name); 678 for (i=0; list[i].x != 0; i++) { 679 if (set & list[i].x) { 680 set &= ~list[i].x; 681 printf("%s%s", comma, list[i].s); 682 comma = ","; 683 } 684 if (clear & list[i].x) { 685 clear &= ~list[i].x; 686 printf("%s!%s", comma, list[i].s); 687 comma = ","; 688 } 689 } 690} 691 692/* 693 * Print the ip address contained in a command. 694 */ 695static void 696print_ip(ipfw_insn_ip *cmd, char const *s) 697{ 698 struct hostent *he = NULL; 699 int len = F_LEN((ipfw_insn *)cmd); 700 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 701 702 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 703 704 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 705 printf("me"); 706 return; 707 } 708 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 709 uint32_t x, *map = (uint32_t *)&(cmd->mask); 710 int i, j; 711 char comma = '{'; 712 713 x = cmd->o.arg1 - 1; 714 x = htonl( ~x ); 715 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 716 printf("%s/%d", inet_ntoa(cmd->addr), 717 contigmask((uint8_t *)&x, 32)); 718 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 719 x &= 0xff; /* base */ 720 /* 721 * Print bits and ranges. 722 * Locate first bit set (i), then locate first bit unset (j). 723 * If we have 3+ consecutive bits set, then print them as a 724 * range, otherwise only print the initial bit and rescan. 725 */ 726 for (i=0; i < cmd->o.arg1; i++) 727 if (map[i/32] & (1<<(i & 31))) { 728 for (j=i+1; j < cmd->o.arg1; j++) 729 if (!(map[ j/32] & (1<<(j & 31)))) 730 break; 731 printf("%c%d", comma, i+x); 732 if (j>i+2) { /* range has at least 3 elements */ 733 printf("-%d", j-1+x); 734 i = j-1; 735 } 736 comma = ','; 737 } 738 printf("}"); 739 return; 740 } 741 /* 742 * len == 2 indicates a single IP, whereas lists of 1 or more 743 * addr/mask pairs have len = (2n+1). We convert len to n so we 744 * use that to count the number of entries. 745 */ 746 for (len = len / 2; len > 0; len--, a += 2) { 747 int mb = /* mask length */ 748 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 749 32 : contigmask((uint8_t *)&(a[1]), 32); 750 if (mb == 32 && do_resolv) 751 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 752 if (he != NULL) /* resolved to name */ 753 printf("%s", he->h_name); 754 else if (mb == 0) /* any */ 755 printf("any"); 756 else { /* numeric IP followed by some kind of mask */ 757 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 758 if (mb < 0) 759 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 760 else if (mb < 32) 761 printf("/%d", mb); 762 } 763 if (len > 1) 764 printf(","); 765 } 766} 767 768/* 769 * prints a MAC address/mask pair 770 */ 771static void 772print_mac(uint8_t *addr, uint8_t *mask) 773{ 774 int l = contigmask(mask, 48); 775 776 if (l == 0) 777 printf(" any"); 778 else { 779 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 780 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 781 if (l == -1) 782 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 783 mask[0], mask[1], mask[2], 784 mask[3], mask[4], mask[5]); 785 else if (l < 48) 786 printf("/%d", l); 787 } 788} 789 790static void 791fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 792{ 793 uint8_t type; 794 795 cmd->d[0] = 0; 796 while (*av) { 797 if (*av == ',') 798 av++; 799 800 type = strtoul(av, &av, 0); 801 802 if (*av != ',' && *av != '\0') 803 errx(EX_DATAERR, "invalid ICMP type"); 804 805 if (type > 31) 806 errx(EX_DATAERR, "ICMP type out of range"); 807 808 cmd->d[0] |= 1 << type; 809 } 810 cmd->o.opcode = O_ICMPTYPE; 811 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 812} 813 814static void 815print_icmptypes(ipfw_insn_u32 *cmd) 816{ 817 int i; 818 char sep= ' '; 819 820 printf(" icmptypes"); 821 for (i = 0; i < 32; i++) { 822 if ( (cmd->d[0] & (1 << (i))) == 0) 823 continue; 824 printf("%c%d", sep, i); 825 sep = ','; 826 } 827} 828 829/* 830 * show_ipfw() prints the body of an ipfw rule. 831 * Because the standard rule has at least proto src_ip dst_ip, we use 832 * a helper function to produce these entries if not provided explicitly. 833 * The first argument is the list of fields we have, the second is 834 * the list of fields we want to be printed. 835 * 836 * Special cases if we have provided a MAC header: 837 * + if the rule does not contain IP addresses/ports, do not print them; 838 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 839 * 840 * Once we have 'have_options', IP header fields are printed as options. 841 */ 842#define HAVE_PROTO 0x0001 843#define HAVE_SRCIP 0x0002 844#define HAVE_DSTIP 0x0004 845#define HAVE_MAC 0x0008 846#define HAVE_MACTYPE 0x0010 847#define HAVE_OPTIONS 0x8000 848 849#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 850static void 851show_prerequisites(int *flags, int want, int cmd) 852{ 853 if ( (*flags & HAVE_IP) == HAVE_IP) 854 *flags |= HAVE_OPTIONS; 855 856 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 857 cmd != O_MAC_TYPE) { 858 /* 859 * mac-type was optimized out by the compiler, 860 * restore it 861 */ 862 printf(" any"); 863 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 864 return; 865 } 866 if ( !(*flags & HAVE_OPTIONS)) { 867 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 868 printf(" ip"); 869 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 870 printf(" from any"); 871 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 872 printf(" to any"); 873 } 874 *flags |= want; 875} 876 877static void 878show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 879{ 880 static int twidth = 0; 881 int l; 882 ipfw_insn *cmd; 883 char *comment = NULL; /* ptr to comment if we have one */ 884 int proto = 0; /* default */ 885 int flags = 0; /* prerequisites */ 886 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 887 int or_block = 0; /* we are in an or block */ 888 uint32_t set_disable; 889 890 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 891 892 if (set_disable & (1 << rule->set)) { /* disabled */ 893 if (!show_sets) 894 return; 895 else 896 printf("# DISABLED "); 897 } 898 printf("%05u ", rule->rulenum); 899 900 if (pcwidth>0 || bcwidth>0) 901 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 902 bcwidth, align_uint64(&rule->bcnt)); 903 904 if (do_time == 2) 905 printf("%10u ", rule->timestamp); 906 else if (do_time == 1) { 907 char timestr[30]; 908 time_t t = (time_t)0; 909 910 if (twidth == 0) { 911 strcpy(timestr, ctime(&t)); 912 *strchr(timestr, '\n') = '\0'; 913 twidth = strlen(timestr); 914 } 915 if (rule->timestamp) { 916#if _FreeBSD_version < 500000 /* XXX check */ 917#define _long_to_time(x) (time_t)(x) 918#endif 919 t = _long_to_time(rule->timestamp); 920 921 strcpy(timestr, ctime(&t)); 922 *strchr(timestr, '\n') = '\0'; 923 printf("%s ", timestr); 924 } else { 925 printf("%*s", twidth, " "); 926 } 927 } 928 929 if (show_sets) 930 printf("set %d ", rule->set); 931 932 /* 933 * print the optional "match probability" 934 */ 935 if (rule->cmd_len > 0) { 936 cmd = rule->cmd ; 937 if (cmd->opcode == O_PROB) { 938 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 939 double d = 1.0 * p->d[0]; 940 941 d = (d / 0x7fffffff); 942 printf("prob %f ", d); 943 } 944 } 945 946 /* 947 * first print actions 948 */ 949 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 950 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 951 switch(cmd->opcode) { 952 case O_CHECK_STATE: 953 printf("check-state"); 954 flags = HAVE_IP; /* avoid printing anything else */ 955 break; 956 957 case O_ACCEPT: 958 printf("allow"); 959 break; 960 961 case O_COUNT: 962 printf("count"); 963 break; 964 965 case O_DENY: 966 printf("deny"); 967 break; 968 969 case O_REJECT: 970 if (cmd->arg1 == ICMP_REJECT_RST) 971 printf("reset"); 972 else if (cmd->arg1 == ICMP_UNREACH_HOST) 973 printf("reject"); 974 else 975 print_reject_code(cmd->arg1); 976 break; 977 978 case O_SKIPTO: 979 printf("skipto %u", cmd->arg1); 980 break; 981 982 case O_PIPE: 983 printf("pipe %u", cmd->arg1); 984 break; 985 986 case O_QUEUE: 987 printf("queue %u", cmd->arg1); 988 break; 989 990 case O_DIVERT: 991 printf("divert %u", cmd->arg1); 992 break; 993 994 case O_TEE: 995 printf("tee %u", cmd->arg1); 996 break; 997 998 case O_FORWARD_IP: 999 { 1000 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1001 1002 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1003 if (s->sa.sin_port) 1004 printf(",%d", s->sa.sin_port); 1005 } 1006 break; 1007 1008 case O_LOG: /* O_LOG is printed last */ 1009 logptr = (ipfw_insn_log *)cmd; 1010 break; 1011 1012 default: 1013 printf("** unrecognized action %d len %d", 1014 cmd->opcode, cmd->len); 1015 } 1016 } 1017 if (logptr) { 1018 if (logptr->max_log > 0) 1019 printf(" log logamount %d", logptr->max_log); 1020 else 1021 printf(" log"); 1022 } 1023 1024 /* 1025 * then print the body. 1026 */ 1027 if (rule->_pad & 1) { /* empty rules before options */ 1028 if (!do_compact) 1029 printf(" ip from any to any"); 1030 flags |= HAVE_IP | HAVE_OPTIONS; 1031 } 1032 1033 for (l = rule->act_ofs, cmd = rule->cmd ; 1034 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1035 /* useful alias */ 1036 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1037 1038 show_prerequisites(&flags, 0, cmd->opcode); 1039 1040 switch(cmd->opcode) { 1041 case O_PROB: 1042 break; /* done already */ 1043 1044 case O_PROBE_STATE: 1045 break; /* no need to print anything here */ 1046 1047 case O_MACADDR2: { 1048 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1049 1050 if ((cmd->len & F_OR) && !or_block) 1051 printf(" {"); 1052 if (cmd->len & F_NOT) 1053 printf(" not"); 1054 printf(" MAC"); 1055 flags |= HAVE_MAC; 1056 print_mac(m->addr, m->mask); 1057 print_mac(m->addr + 6, m->mask + 6); 1058 } 1059 break; 1060 1061 case O_MAC_TYPE: 1062 if ((cmd->len & F_OR) && !or_block) 1063 printf(" {"); 1064 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1065 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1066 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1067 break; 1068 1069 case O_IP_SRC: 1070 case O_IP_SRC_MASK: 1071 case O_IP_SRC_ME: 1072 case O_IP_SRC_SET: 1073 show_prerequisites(&flags, HAVE_PROTO, 0); 1074 if (!(flags & HAVE_SRCIP)) 1075 printf(" from"); 1076 if ((cmd->len & F_OR) && !or_block) 1077 printf(" {"); 1078 print_ip((ipfw_insn_ip *)cmd, 1079 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1080 flags |= HAVE_SRCIP; 1081 break; 1082 1083 case O_IP_DST: 1084 case O_IP_DST_MASK: 1085 case O_IP_DST_ME: 1086 case O_IP_DST_SET: 1087 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1088 if (!(flags & HAVE_DSTIP)) 1089 printf(" to"); 1090 if ((cmd->len & F_OR) && !or_block) 1091 printf(" {"); 1092 print_ip((ipfw_insn_ip *)cmd, 1093 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1094 flags |= HAVE_DSTIP; 1095 break; 1096 1097 case O_IP_DSTPORT: 1098 show_prerequisites(&flags, HAVE_IP, 0); 1099 case O_IP_SRCPORT: 1100 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1101 if ((cmd->len & F_OR) && !or_block) 1102 printf(" {"); 1103 print_newports((ipfw_insn_u16 *)cmd, proto, 1104 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1105 break; 1106 1107 case O_PROTO: { 1108 struct protoent *pe; 1109 1110 if ((cmd->len & F_OR) && !or_block) 1111 printf(" {"); 1112 if (cmd->len & F_NOT) 1113 printf(" not"); 1114 proto = cmd->arg1; 1115 pe = getprotobynumber(cmd->arg1); 1116 if (flags & HAVE_OPTIONS) 1117 printf(" proto"); 1118 if (pe) 1119 printf(" %s", pe->p_name); 1120 else 1121 printf(" %u", cmd->arg1); 1122 } 1123 flags |= HAVE_PROTO; 1124 break; 1125 1126 default: /*options ... */ 1127 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1128 if ((cmd->len & F_OR) && !or_block) 1129 printf(" {"); 1130 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1131 printf(" not"); 1132 switch(cmd->opcode) { 1133 case O_FRAG: 1134 printf(" frag"); 1135 break; 1136 1137 case O_IN: 1138 printf(cmd->len & F_NOT ? " out" : " in"); 1139 break; 1140 1141 case O_LAYER2: 1142 printf(" layer2"); 1143 break; 1144 case O_XMIT: 1145 case O_RECV: 1146 case O_VIA: { 1147 char const *s; 1148 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1149 1150 if (cmd->opcode == O_XMIT) 1151 s = "xmit"; 1152 else if (cmd->opcode == O_RECV) 1153 s = "recv"; 1154 else /* if (cmd->opcode == O_VIA) */ 1155 s = "via"; 1156 if (cmdif->name[0] == '\0') 1157 printf(" %s %s", s, 1158 inet_ntoa(cmdif->p.ip)); 1159 else if (cmdif->p.unit == -1) 1160 printf(" %s %s*", s, cmdif->name); 1161 else 1162 printf(" %s %s%d", s, cmdif->name, 1163 cmdif->p.unit); 1164 } 1165 break; 1166 1167 case O_IPID: 1168 if (F_LEN(cmd) == 1) 1169 printf(" ipid %u", cmd->arg1 ); 1170 else 1171 print_newports((ipfw_insn_u16 *)cmd, 0, 1172 O_IPID); 1173 break; 1174 1175 case O_IPTTL: 1176 if (F_LEN(cmd) == 1) 1177 printf(" ipttl %u", cmd->arg1 ); 1178 else 1179 print_newports((ipfw_insn_u16 *)cmd, 0, 1180 O_IPTTL); 1181 break; 1182 1183 case O_IPVER: 1184 printf(" ipver %u", cmd->arg1 ); 1185 break; 1186 1187 case O_IPPRECEDENCE: 1188 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1189 break; 1190 1191 case O_IPLEN: 1192 if (F_LEN(cmd) == 1) 1193 printf(" iplen %u", cmd->arg1 ); 1194 else 1195 print_newports((ipfw_insn_u16 *)cmd, 0, 1196 O_IPLEN); 1197 break; 1198 1199 case O_IPOPT: 1200 print_flags("ipoptions", cmd, f_ipopts); 1201 break; 1202 1203 case O_IPTOS: 1204 print_flags("iptos", cmd, f_iptos); 1205 break; 1206 1207 case O_ICMPTYPE: 1208 print_icmptypes((ipfw_insn_u32 *)cmd); 1209 break; 1210 1211 case O_ESTAB: 1212 printf(" established"); 1213 break; 1214 1215 case O_TCPFLAGS: 1216 print_flags("tcpflags", cmd, f_tcpflags); 1217 break; 1218 1219 case O_TCPOPTS: 1220 print_flags("tcpoptions", cmd, f_tcpopts); 1221 break; 1222 1223 case O_TCPWIN: 1224 printf(" tcpwin %d", ntohs(cmd->arg1)); 1225 break; 1226 1227 case O_TCPACK: 1228 printf(" tcpack %d", ntohl(cmd32->d[0])); 1229 break; 1230 1231 case O_TCPSEQ: 1232 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1233 break; 1234 1235 case O_UID: 1236 { 1237 struct passwd *pwd = getpwuid(cmd32->d[0]); 1238 1239 if (pwd) 1240 printf(" uid %s", pwd->pw_name); 1241 else 1242 printf(" uid %u", cmd32->d[0]); 1243 } 1244 break; 1245 1246 case O_GID: 1247 { 1248 struct group *grp = getgrgid(cmd32->d[0]); 1249 1250 if (grp) 1251 printf(" gid %s", grp->gr_name); 1252 else 1253 printf(" gid %u", cmd32->d[0]); 1254 } 1255 break; 1256 1257 case O_VERREVPATH: 1258 printf(" verrevpath"); 1259 break; 1260 1261 case O_IPSEC: 1262 printf(" ipsec"); 1263 break; 1264 1265 case O_NOP: 1266 comment = (char *)(cmd + 1); 1267 break; 1268 1269 case O_KEEP_STATE: 1270 printf(" keep-state"); 1271 break; 1272 1273 case O_LIMIT: 1274 { 1275 struct _s_x *p = limit_masks; 1276 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1277 uint8_t x = c->limit_mask; 1278 char const *comma = " "; 1279 1280 printf(" limit"); 1281 for (; p->x != 0 ; p++) 1282 if ((x & p->x) == p->x) { 1283 x &= ~p->x; 1284 printf("%s%s", comma, p->s); 1285 comma = ","; 1286 } 1287 printf(" %d", c->conn_limit); 1288 } 1289 break; 1290 1291 default: 1292 printf(" [opcode %d len %d]", 1293 cmd->opcode, cmd->len); 1294 } 1295 } 1296 if (cmd->len & F_OR) { 1297 printf(" or"); 1298 or_block = 1; 1299 } else if (or_block) { 1300 printf(" }"); 1301 or_block = 0; 1302 } 1303 } 1304 show_prerequisites(&flags, HAVE_IP, 0); 1305 if (comment) 1306 printf(" // %s", comment); 1307 printf("\n"); 1308} 1309 1310static void 1311show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1312{ 1313 struct protoent *pe; 1314 struct in_addr a; 1315 uint16_t rulenum; 1316 1317 if (!do_expired) { 1318 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1319 return; 1320 } 1321 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1322 printf("%05d", rulenum); 1323 if (pcwidth>0 || bcwidth>0) 1324 printf(" %*llu %*llu (%ds)", pcwidth, 1325 align_uint64(&d->pcnt), bcwidth, 1326 align_uint64(&d->bcnt), d->expire); 1327 switch (d->dyn_type) { 1328 case O_LIMIT_PARENT: 1329 printf(" PARENT %d", d->count); 1330 break; 1331 case O_LIMIT: 1332 printf(" LIMIT"); 1333 break; 1334 case O_KEEP_STATE: /* bidir, no mask */ 1335 printf(" STATE"); 1336 break; 1337 } 1338 1339 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1340 printf(" %s", pe->p_name); 1341 else 1342 printf(" proto %u", d->id.proto); 1343 1344 a.s_addr = htonl(d->id.src_ip); 1345 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1346 1347 a.s_addr = htonl(d->id.dst_ip); 1348 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1349 printf("\n"); 1350} 1351 1352static int 1353sort_q(const void *pa, const void *pb) 1354{ 1355 int rev = (do_sort < 0); 1356 int field = rev ? -do_sort : do_sort; 1357 long long res = 0; 1358 const struct dn_flow_queue *a = pa; 1359 const struct dn_flow_queue *b = pb; 1360 1361 switch (field) { 1362 case 1: /* pkts */ 1363 res = a->len - b->len; 1364 break; 1365 case 2: /* bytes */ 1366 res = a->len_bytes - b->len_bytes; 1367 break; 1368 1369 case 3: /* tot pkts */ 1370 res = a->tot_pkts - b->tot_pkts; 1371 break; 1372 1373 case 4: /* tot bytes */ 1374 res = a->tot_bytes - b->tot_bytes; 1375 break; 1376 } 1377 if (res < 0) 1378 res = -1; 1379 if (res > 0) 1380 res = 1; 1381 return (int)(rev ? res : -res); 1382} 1383 1384static void 1385list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1386{ 1387 int l; 1388 1389 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1390 fs->flow_mask.proto, 1391 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1392 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1393 if (fs->rq_elements == 0) 1394 return; 1395 1396 printf("BKT Prot ___Source IP/port____ " 1397 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1398 if (do_sort != 0) 1399 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1400 for (l = 0; l < fs->rq_elements; l++) { 1401 struct in_addr ina; 1402 struct protoent *pe; 1403 1404 ina.s_addr = htonl(q[l].id.src_ip); 1405 printf("%3d ", q[l].hash_slot); 1406 pe = getprotobynumber(q[l].id.proto); 1407 if (pe) 1408 printf("%-4s ", pe->p_name); 1409 else 1410 printf("%4u ", q[l].id.proto); 1411 printf("%15s/%-5d ", 1412 inet_ntoa(ina), q[l].id.src_port); 1413 ina.s_addr = htonl(q[l].id.dst_ip); 1414 printf("%15s/%-5d ", 1415 inet_ntoa(ina), q[l].id.dst_port); 1416 printf("%4qu %8qu %2u %4u %3u\n", 1417 q[l].tot_pkts, q[l].tot_bytes, 1418 q[l].len, q[l].len_bytes, q[l].drops); 1419 if (verbose) 1420 printf(" S %20qd F %20qd\n", 1421 q[l].S, q[l].F); 1422 } 1423} 1424 1425static void 1426print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1427{ 1428 int l; 1429 char qs[30]; 1430 char plr[30]; 1431 char red[90]; /* Display RED parameters */ 1432 1433 l = fs->qsize; 1434 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1435 if (l >= 8192) 1436 sprintf(qs, "%d KB", l / 1024); 1437 else 1438 sprintf(qs, "%d B", l); 1439 } else 1440 sprintf(qs, "%3d sl.", l); 1441 if (fs->plr) 1442 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1443 else 1444 plr[0] = '\0'; 1445 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1446 sprintf(red, 1447 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1448 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1449 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1450 SCALE_VAL(fs->min_th), 1451 SCALE_VAL(fs->max_th), 1452 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1453 else 1454 sprintf(red, "droptail"); 1455 1456 printf("%s %s%s %d queues (%d buckets) %s\n", 1457 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1458} 1459 1460static void 1461list_pipes(void *data, uint nbytes, int ac, char *av[]) 1462{ 1463 int rulenum; 1464 void *next = data; 1465 struct dn_pipe *p = (struct dn_pipe *) data; 1466 struct dn_flow_set *fs; 1467 struct dn_flow_queue *q; 1468 int l; 1469 1470 if (ac > 0) 1471 rulenum = strtoul(*av++, NULL, 10); 1472 else 1473 rulenum = 0; 1474 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1475 double b = p->bandwidth; 1476 char buf[30]; 1477 char prefix[80]; 1478 1479 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1480 break; /* done with pipes, now queues */ 1481 1482 /* 1483 * compute length, as pipe have variable size 1484 */ 1485 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1486 next = (char *)p + l; 1487 nbytes -= l; 1488 1489 if (rulenum != 0 && rulenum != p->pipe_nr) 1490 continue; 1491 1492 /* 1493 * Print rate (or clocking interface) 1494 */ 1495 if (p->if_name[0] != '\0') 1496 sprintf(buf, "%s", p->if_name); 1497 else if (b == 0) 1498 sprintf(buf, "unlimited"); 1499 else if (b >= 1000000) 1500 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1501 else if (b >= 1000) 1502 sprintf(buf, "%7.3f Kbit/s", b/1000); 1503 else 1504 sprintf(buf, "%7.3f bit/s ", b); 1505 1506 sprintf(prefix, "%05d: %s %4d ms ", 1507 p->pipe_nr, buf, p->delay); 1508 print_flowset_parms(&(p->fs), prefix); 1509 if (verbose) 1510 printf(" V %20qd\n", p->V >> MY_M); 1511 1512 q = (struct dn_flow_queue *)(p+1); 1513 list_queues(&(p->fs), q); 1514 } 1515 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1516 char prefix[80]; 1517 1518 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1519 break; 1520 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1521 next = (char *)fs + l; 1522 nbytes -= l; 1523 q = (struct dn_flow_queue *)(fs+1); 1524 sprintf(prefix, "q%05d: weight %d pipe %d ", 1525 fs->fs_nr, fs->weight, fs->parent_nr); 1526 print_flowset_parms(fs, prefix); 1527 list_queues(fs, q); 1528 } 1529} 1530 1531/* 1532 * This one handles all set-related commands 1533 * ipfw set { show | enable | disable } 1534 * ipfw set swap X Y 1535 * ipfw set move X to Y 1536 * ipfw set move rule X to Y 1537 */ 1538static void 1539sets_handler(int ac, char *av[]) 1540{ 1541 uint32_t set_disable, masks[2]; 1542 int i, nbytes; 1543 uint16_t rulenum; 1544 uint8_t cmd, new_set; 1545 1546 ac--; 1547 av++; 1548 1549 if (!ac) 1550 errx(EX_USAGE, "set needs command"); 1551 if (!strncmp(*av, "show", strlen(*av)) ) { 1552 void *data; 1553 char const *msg; 1554 1555 nbytes = sizeof(struct ip_fw); 1556 if ((data = calloc(1, nbytes)) == NULL) 1557 err(EX_OSERR, "calloc"); 1558 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1559 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1560 bcopy(&((struct ip_fw *)data)->next_rule, 1561 &set_disable, sizeof(set_disable)); 1562 1563 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1564 if ((set_disable & (1<<i))) { 1565 printf("%s %d", msg, i); 1566 msg = ""; 1567 } 1568 msg = (set_disable) ? " enable" : "enable"; 1569 for (i = 0; i < RESVD_SET; i++) 1570 if (!(set_disable & (1<<i))) { 1571 printf("%s %d", msg, i); 1572 msg = ""; 1573 } 1574 printf("\n"); 1575 } else if (!strncmp(*av, "swap", strlen(*av))) { 1576 ac--; av++; 1577 if (ac != 2) 1578 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1579 rulenum = atoi(av[0]); 1580 new_set = atoi(av[1]); 1581 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1582 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1583 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1584 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1585 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1586 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1587 } else if (!strncmp(*av, "move", strlen(*av))) { 1588 ac--; av++; 1589 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1590 cmd = 2; 1591 ac--; av++; 1592 } else 1593 cmd = 3; 1594 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1595 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1596 rulenum = atoi(av[0]); 1597 new_set = atoi(av[2]); 1598 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1599 (cmd == 2 && rulenum == 65535) ) 1600 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1601 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1602 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1603 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1604 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1605 } else if (!strncmp(*av, "disable", strlen(*av)) || 1606 !strncmp(*av, "enable", strlen(*av)) ) { 1607 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1608 1609 ac--; av++; 1610 masks[0] = masks[1] = 0; 1611 1612 while (ac) { 1613 if (isdigit(**av)) { 1614 i = atoi(*av); 1615 if (i < 0 || i > RESVD_SET) 1616 errx(EX_DATAERR, 1617 "invalid set number %d\n", i); 1618 masks[which] |= (1<<i); 1619 } else if (!strncmp(*av, "disable", strlen(*av))) 1620 which = 0; 1621 else if (!strncmp(*av, "enable", strlen(*av))) 1622 which = 1; 1623 else 1624 errx(EX_DATAERR, 1625 "invalid set command %s\n", *av); 1626 av++; ac--; 1627 } 1628 if ( (masks[0] & masks[1]) != 0 ) 1629 errx(EX_DATAERR, 1630 "cannot enable and disable the same set\n"); 1631 1632 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1633 if (i) 1634 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1635 } else 1636 errx(EX_USAGE, "invalid set command %s\n", *av); 1637} 1638 1639static void 1640sysctl_handler(int ac, char *av[], int which) 1641{ 1642 ac--; 1643 av++; 1644 1645 if (ac == 0) { 1646 warnx("missing keyword to enable/disable\n"); 1647 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1648 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1649 &which, sizeof(which)); 1650 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1651 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1652 &which, sizeof(which)); 1653 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1654 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1655 &which, sizeof(which)); 1656 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1657 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1658 &which, sizeof(which)); 1659 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1660 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1661 &which, sizeof(which)); 1662 } else { 1663 warnx("unrecognize enable/disable keyword: %s\n", *av); 1664 } 1665} 1666 1667static void 1668list(int ac, char *av[], int show_counters) 1669{ 1670 struct ip_fw *r; 1671 ipfw_dyn_rule *dynrules, *d; 1672 1673#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1674 char *lim; 1675 void *data = NULL; 1676 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1677 int exitval = EX_OK; 1678 int lac; 1679 char **lav; 1680 u_long rnum, last; 1681 char *endptr; 1682 int seen = 0; 1683 1684 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1685 int nalloc = 1024; /* start somewhere... */ 1686 1687 if (test_only) { 1688 fprintf(stderr, "Testing only, list disabled\n"); 1689 return; 1690 } 1691 1692 ac--; 1693 av++; 1694 1695 /* get rules or pipes from kernel, resizing array as necessary */ 1696 nbytes = nalloc; 1697 1698 while (nbytes >= nalloc) { 1699 nalloc = nalloc * 2 + 200; 1700 nbytes = nalloc; 1701 if ((data = realloc(data, nbytes)) == NULL) 1702 err(EX_OSERR, "realloc"); 1703 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1704 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1705 do_pipe ? "DUMMYNET" : "FW"); 1706 } 1707 1708 if (do_pipe) { 1709 list_pipes(data, nbytes, ac, av); 1710 goto done; 1711 } 1712 1713 /* 1714 * Count static rules. They have variable size so we 1715 * need to scan the list to count them. 1716 */ 1717 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1718 r->rulenum < 65535 && (char *)r < lim; 1719 ++nstat, r = NEXT(r) ) 1720 ; /* nothing */ 1721 1722 /* 1723 * Count dynamic rules. This is easier as they have 1724 * fixed size. 1725 */ 1726 r = NEXT(r); 1727 dynrules = (ipfw_dyn_rule *)r ; 1728 n = (char *)r - (char *)data; 1729 ndyn = (nbytes - n) / sizeof *dynrules; 1730 1731 /* if showing stats, figure out column widths ahead of time */ 1732 bcwidth = pcwidth = 0; 1733 if (show_counters) { 1734 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1735 /* packet counter */ 1736 width = snprintf(NULL, 0, "%llu", 1737 align_uint64(&r->pcnt)); 1738 if (width > pcwidth) 1739 pcwidth = width; 1740 1741 /* byte counter */ 1742 width = snprintf(NULL, 0, "%llu", 1743 align_uint64(&r->bcnt)); 1744 if (width > bcwidth) 1745 bcwidth = width; 1746 } 1747 } 1748 if (do_dynamic && ndyn) { 1749 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1750 width = snprintf(NULL, 0, "%llu", 1751 align_uint64(&d->pcnt)); 1752 if (width > pcwidth) 1753 pcwidth = width; 1754 1755 width = snprintf(NULL, 0, "%llu", 1756 align_uint64(&d->bcnt)); 1757 if (width > bcwidth) 1758 bcwidth = width; 1759 } 1760 } 1761 /* if no rule numbers were specified, list all rules */ 1762 if (ac == 0) { 1763 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1764 show_ipfw(r, pcwidth, bcwidth); 1765 1766 if (do_dynamic && ndyn) { 1767 printf("## Dynamic rules (%d):\n", ndyn); 1768 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1769 show_dyn_ipfw(d, pcwidth, bcwidth); 1770 } 1771 goto done; 1772 } 1773 1774 /* display specific rules requested on command line */ 1775 1776 for (lac = ac, lav = av; lac != 0; lac--) { 1777 /* convert command line rule # */ 1778 last = rnum = strtoul(*lav++, &endptr, 10); 1779 if (*endptr == '-') 1780 last = strtoul(endptr+1, &endptr, 10); 1781 if (*endptr) { 1782 exitval = EX_USAGE; 1783 warnx("invalid rule number: %s", *(lav - 1)); 1784 continue; 1785 } 1786 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1787 if (r->rulenum > last) 1788 break; 1789 if (r->rulenum >= rnum && r->rulenum <= last) { 1790 show_ipfw(r, pcwidth, bcwidth); 1791 seen = 1; 1792 } 1793 } 1794 if (!seen) { 1795 /* give precedence to other error(s) */ 1796 if (exitval == EX_OK) 1797 exitval = EX_UNAVAILABLE; 1798 warnx("rule %lu does not exist", rnum); 1799 } 1800 } 1801 1802 if (do_dynamic && ndyn) { 1803 printf("## Dynamic rules:\n"); 1804 for (lac = ac, lav = av; lac != 0; lac--) { 1805 rnum = strtoul(*lav++, &endptr, 10); 1806 if (*endptr == '-') 1807 last = strtoul(endptr+1, &endptr, 10); 1808 if (*endptr) 1809 /* already warned */ 1810 continue; 1811 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1812 uint16_t rulenum; 1813 1814 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1815 if (rulenum > rnum) 1816 break; 1817 if (r->rulenum >= rnum && r->rulenum <= last) 1818 show_dyn_ipfw(d, pcwidth, bcwidth); 1819 } 1820 } 1821 } 1822 1823 ac = 0; 1824 1825done: 1826 free(data); 1827 1828 if (exitval != EX_OK) 1829 exit(exitval); 1830#undef NEXT 1831} 1832 1833static void 1834show_usage(void) 1835{ 1836 fprintf(stderr, "usage: ipfw [options]\n" 1837"do \"ipfw -h\" or see ipfw manpage for details\n" 1838); 1839 exit(EX_USAGE); 1840} 1841 1842static void 1843help(void) 1844{ 1845 fprintf(stderr, 1846"ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1847"ipfw [-acdeftTnNpqS] <command> where <command> is one of:\n" 1848"add [num] [set N] [prob x] RULE-BODY\n" 1849"{pipe|queue} N config PIPE-BODY\n" 1850"[pipe|queue] {zero|delete|show} [N{,N}]\n" 1851"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1852"\n" 1853"RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1854"ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1855" {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1856"ADDR: [ MAC dst src ether_type ] \n" 1857" [ from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 1858"IPADDR: [not] { any | me | ip/bits{x,y,z} | IPLIST }\n" 1859"IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 1860"OPTION_LIST: OPTION [OPTION_LIST]\n" 1861"OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1862" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1863" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1864" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1865" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1866" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1867" verrevpath\n" 1868); 1869exit(0); 1870} 1871 1872 1873static int 1874lookup_host (char *host, struct in_addr *ipaddr) 1875{ 1876 struct hostent *he; 1877 1878 if (!inet_aton(host, ipaddr)) { 1879 if ((he = gethostbyname(host)) == NULL) 1880 return(-1); 1881 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1882 } 1883 return(0); 1884} 1885 1886/* 1887 * fills the addr and mask fields in the instruction as appropriate from av. 1888 * Update length as appropriate. 1889 * The following formats are allowed: 1890 * any matches any IP. Actually returns an empty instruction. 1891 * me returns O_IP_*_ME 1892 * 1.2.3.4 single IP address 1893 * 1.2.3.4:5.6.7.8 address:mask 1894 * 1.2.3.4/24 address/mask 1895 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1896 * We can have multiple comma-separated address/mask entries. 1897 */ 1898static void 1899fill_ip(ipfw_insn_ip *cmd, char *av) 1900{ 1901 int len = 0; 1902 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1903 1904 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1905 1906 if (!strncmp(av, "any", strlen(av))) 1907 return; 1908 1909 if (!strncmp(av, "me", strlen(av))) { 1910 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1911 return; 1912 } 1913 1914 while (av) { 1915 /* 1916 * After the address we can have '/' or ':' indicating a mask, 1917 * ',' indicating another address follows, '{' indicating a 1918 * set of addresses of unspecified size. 1919 */ 1920 char *p = strpbrk(av, "/:,{"); 1921 int masklen; 1922 char md; 1923 1924 if (p) { 1925 md = *p; 1926 *p++ = '\0'; 1927 } else 1928 md = '\0'; 1929 1930 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1931 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1932 switch (md) { 1933 case ':': 1934 if (!inet_aton(p, (struct in_addr *)&d[1])) 1935 errx(EX_DATAERR, "bad netmask ``%s''", p); 1936 break; 1937 case '/': 1938 masklen = atoi(p); 1939 if (masklen == 0) 1940 d[1] = htonl(0); /* mask */ 1941 else if (masklen > 32) 1942 errx(EX_DATAERR, "bad width ``%s''", p); 1943 else 1944 d[1] = htonl(~0 << (32 - masklen)); 1945 break; 1946 case '{': /* no mask, assume /24 and put back the '{' */ 1947 d[1] = htonl(~0 << (32 - 24)); 1948 *(--p) = md; 1949 break; 1950 1951 case ',': /* single address plus continuation */ 1952 *(--p) = md; 1953 /* FALLTHROUGH */ 1954 case 0: /* initialization value */ 1955 default: 1956 d[1] = htonl(~0); /* force /32 */ 1957 break; 1958 } 1959 d[0] &= d[1]; /* mask base address with mask */ 1960 /* find next separator */ 1961 if (p) 1962 p = strpbrk(p, ",{"); 1963 if (p && *p == '{') { 1964 /* 1965 * We have a set of addresses. They are stored as follows: 1966 * arg1 is the set size (powers of 2, 2..256) 1967 * addr is the base address IN HOST FORMAT 1968 * mask.. is an array of arg1 bits (rounded up to 1969 * the next multiple of 32) with bits set 1970 * for each host in the map. 1971 */ 1972 uint32_t *map = (uint32_t *)&cmd->mask; 1973 int low, high; 1974 int i = contigmask((uint8_t *)&(d[1]), 32); 1975 1976 if (len > 0) 1977 errx(EX_DATAERR, "address set cannot be in a list"); 1978 if (i < 24 || i > 31) 1979 errx(EX_DATAERR, "invalid set with mask %d\n", i); 1980 cmd->o.arg1 = 1<<(32-i); /* map length */ 1981 d[0] = ntohl(d[0]); /* base addr in host format */ 1982 cmd->o.opcode = O_IP_DST_SET; /* default */ 1983 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 1984 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 1985 map[i] = 0; /* clear map */ 1986 1987 av = p + 1; 1988 low = d[0] & 0xff; 1989 high = low + cmd->o.arg1 - 1; 1990 /* 1991 * Here, i stores the previous value when we specify a range 1992 * of addresses within a mask, e.g. 45-63. i = -1 means we 1993 * have no previous value. 1994 */ 1995 i = -1; /* previous value in a range */ 1996 while (isdigit(*av)) { 1997 char *s; 1998 int a = strtol(av, &s, 0); 1999 2000 if (s == av) { /* no parameter */ 2001 if (*av != '}') 2002 errx(EX_DATAERR, "set not closed\n"); 2003 if (i != -1) 2004 errx(EX_DATAERR, "incomplete range %d-", i); 2005 break; 2006 } 2007 if (a < low || a > high) 2008 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2009 a, low, high); 2010 a -= low; 2011 if (i == -1) /* no previous in range */ 2012 i = a; 2013 else { /* check that range is valid */ 2014 if (i > a) 2015 errx(EX_DATAERR, "invalid range %d-%d", 2016 i+low, a+low); 2017 if (*s == '-') 2018 errx(EX_DATAERR, "double '-' in range"); 2019 } 2020 for (; i <= a; i++) 2021 map[i/32] |= 1<<(i & 31); 2022 i = -1; 2023 if (*s == '-') 2024 i = a; 2025 else if (*s == '}') 2026 break; 2027 av = s+1; 2028 } 2029 return; 2030 } 2031 av = p; 2032 if (av) /* then *av must be a ',' */ 2033 av++; 2034 2035 /* Check this entry */ 2036 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2037 /* 2038 * 'any' turns the entire list into a NOP. 2039 * 'not any' never matches, so it is removed from the 2040 * list unless it is the only item, in which case we 2041 * report an error. 2042 */ 2043 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2044 if (av == NULL && len == 0) /* only this entry */ 2045 errx(EX_DATAERR, "not any never matches"); 2046 } 2047 /* else do nothing and skip this entry */ 2048 continue; 2049 } 2050 /* A single IP can be stored in an optimized format */ 2051 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2052 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2053 return; 2054 } 2055 len += 2; /* two words... */ 2056 d += 2; 2057 } /* end while */ 2058 cmd->o.len |= len+1; 2059} 2060 2061 2062/* 2063 * helper function to process a set of flags and set bits in the 2064 * appropriate masks. 2065 */ 2066static void 2067fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2068 struct _s_x *flags, char *p) 2069{ 2070 uint8_t set=0, clear=0; 2071 2072 while (p && *p) { 2073 char *q; /* points to the separator */ 2074 int val; 2075 uint8_t *which; /* mask we are working on */ 2076 2077 if (*p == '!') { 2078 p++; 2079 which = &clear; 2080 } else 2081 which = &set; 2082 q = strchr(p, ','); 2083 if (q) 2084 *q++ = '\0'; 2085 val = match_token(flags, p); 2086 if (val <= 0) 2087 errx(EX_DATAERR, "invalid flag %s", p); 2088 *which |= (uint8_t)val; 2089 p = q; 2090 } 2091 cmd->opcode = opcode; 2092 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2093 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2094} 2095 2096 2097static void 2098delete(int ac, char *av[]) 2099{ 2100 uint32_t rulenum; 2101 struct dn_pipe p; 2102 int i; 2103 int exitval = EX_OK; 2104 int do_set = 0; 2105 2106 memset(&p, 0, sizeof p); 2107 2108 av++; ac--; 2109 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2110 do_set = 1; /* delete set */ 2111 ac--; av++; 2112 } 2113 2114 /* Rule number */ 2115 while (ac && isdigit(**av)) { 2116 i = atoi(*av); av++; ac--; 2117 if (do_pipe) { 2118 if (do_pipe == 1) 2119 p.pipe_nr = i; 2120 else 2121 p.fs.fs_nr = i; 2122 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2123 if (i) { 2124 exitval = 1; 2125 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2126 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2127 } 2128 } else { 2129 rulenum = (i & 0xffff) | (do_set << 24); 2130 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2131 if (i) { 2132 exitval = EX_UNAVAILABLE; 2133 warn("rule %u: setsockopt(IP_FW_DEL)", 2134 rulenum); 2135 } 2136 } 2137 } 2138 if (exitval != EX_OK) 2139 exit(exitval); 2140} 2141 2142 2143/* 2144 * fill the interface structure. We do not check the name as we can 2145 * create interfaces dynamically, so checking them at insert time 2146 * makes relatively little sense. 2147 * A '*' following the name means any unit. 2148 */ 2149static void 2150fill_iface(ipfw_insn_if *cmd, char *arg) 2151{ 2152 cmd->name[0] = '\0'; 2153 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2154 2155 /* Parse the interface or address */ 2156 if (!strcmp(arg, "any")) 2157 cmd->o.len = 0; /* effectively ignore this command */ 2158 else if (!isdigit(*arg)) { 2159 char *q; 2160 2161 strncpy(cmd->name, arg, sizeof(cmd->name)); 2162 cmd->name[sizeof(cmd->name) - 1] = '\0'; 2163 /* find first digit or wildcard */ 2164 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++) 2165 continue; 2166 cmd->p.unit = (*q == '*') ? -1 : atoi(q); 2167 *q = '\0'; 2168 } else if (!inet_aton(arg, &cmd->p.ip)) 2169 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2170} 2171 2172/* 2173 * the following macro returns an error message if we run out of 2174 * arguments. 2175 */ 2176#define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 2177 2178static void 2179config_pipe(int ac, char **av) 2180{ 2181 struct dn_pipe p; 2182 int i; 2183 char *end; 2184 uint32_t a; 2185 void *par = NULL; 2186 2187 memset(&p, 0, sizeof p); 2188 2189 av++; ac--; 2190 /* Pipe number */ 2191 if (ac && isdigit(**av)) { 2192 i = atoi(*av); av++; ac--; 2193 if (do_pipe == 1) 2194 p.pipe_nr = i; 2195 else 2196 p.fs.fs_nr = i; 2197 } 2198 while (ac > 0) { 2199 double d; 2200 int tok = match_token(dummynet_params, *av); 2201 ac--; av++; 2202 2203 switch(tok) { 2204 case TOK_NOERROR: 2205 p.fs.flags_fs |= DN_NOERROR; 2206 break; 2207 2208 case TOK_PLR: 2209 NEED1("plr needs argument 0..1\n"); 2210 d = strtod(av[0], NULL); 2211 if (d > 1) 2212 d = 1; 2213 else if (d < 0) 2214 d = 0; 2215 p.fs.plr = (int)(d*0x7fffffff); 2216 ac--; av++; 2217 break; 2218 2219 case TOK_QUEUE: 2220 NEED1("queue needs queue size\n"); 2221 end = NULL; 2222 p.fs.qsize = strtoul(av[0], &end, 0); 2223 if (*end == 'K' || *end == 'k') { 2224 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2225 p.fs.qsize *= 1024; 2226 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2227 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2228 } 2229 ac--; av++; 2230 break; 2231 2232 case TOK_BUCKETS: 2233 NEED1("buckets needs argument\n"); 2234 p.fs.rq_size = strtoul(av[0], NULL, 0); 2235 ac--; av++; 2236 break; 2237 2238 case TOK_MASK: 2239 NEED1("mask needs mask specifier\n"); 2240 /* 2241 * per-flow queue, mask is dst_ip, dst_port, 2242 * src_ip, src_port, proto measured in bits 2243 */ 2244 par = NULL; 2245 2246 p.fs.flow_mask.dst_ip = 0; 2247 p.fs.flow_mask.src_ip = 0; 2248 p.fs.flow_mask.dst_port = 0; 2249 p.fs.flow_mask.src_port = 0; 2250 p.fs.flow_mask.proto = 0; 2251 end = NULL; 2252 2253 while (ac >= 1) { 2254 uint32_t *p32 = NULL; 2255 uint16_t *p16 = NULL; 2256 2257 tok = match_token(dummynet_params, *av); 2258 ac--; av++; 2259 switch(tok) { 2260 case TOK_ALL: 2261 /* 2262 * special case, all bits significant 2263 */ 2264 p.fs.flow_mask.dst_ip = ~0; 2265 p.fs.flow_mask.src_ip = ~0; 2266 p.fs.flow_mask.dst_port = ~0; 2267 p.fs.flow_mask.src_port = ~0; 2268 p.fs.flow_mask.proto = ~0; 2269 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2270 goto end_mask; 2271 2272 case TOK_DSTIP: 2273 p32 = &p.fs.flow_mask.dst_ip; 2274 break; 2275 2276 case TOK_SRCIP: 2277 p32 = &p.fs.flow_mask.src_ip; 2278 break; 2279 2280 case TOK_DSTPORT: 2281 p16 = &p.fs.flow_mask.dst_port; 2282 break; 2283 2284 case TOK_SRCPORT: 2285 p16 = &p.fs.flow_mask.src_port; 2286 break; 2287 2288 case TOK_PROTO: 2289 break; 2290 2291 default: 2292 ac++; av--; /* backtrack */ 2293 goto end_mask; 2294 } 2295 if (ac < 1) 2296 errx(EX_USAGE, "mask: value missing"); 2297 if (*av[0] == '/') { 2298 a = strtoul(av[0]+1, &end, 0); 2299 a = (a == 32) ? ~0 : (1 << a) - 1; 2300 } else 2301 a = strtoul(av[0], &end, 0); 2302 if (p32 != NULL) 2303 *p32 = a; 2304 else if (p16 != NULL) { 2305 if (a > 65535) 2306 errx(EX_DATAERR, 2307 "mask: must be 16 bit"); 2308 *p16 = (uint16_t)a; 2309 } else { 2310 if (a > 255) 2311 errx(EX_DATAERR, 2312 "mask: must be 8 bit"); 2313 p.fs.flow_mask.proto = (uint8_t)a; 2314 } 2315 if (a != 0) 2316 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2317 ac--; av++; 2318 } /* end while, config masks */ 2319end_mask: 2320 break; 2321 2322 case TOK_RED: 2323 case TOK_GRED: 2324 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2325 p.fs.flags_fs |= DN_IS_RED; 2326 if (tok == TOK_GRED) 2327 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2328 /* 2329 * the format for parameters is w_q/min_th/max_th/max_p 2330 */ 2331 if ((end = strsep(&av[0], "/"))) { 2332 double w_q = strtod(end, NULL); 2333 if (w_q > 1 || w_q <= 0) 2334 errx(EX_DATAERR, "0 < w_q <= 1"); 2335 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2336 } 2337 if ((end = strsep(&av[0], "/"))) { 2338 p.fs.min_th = strtoul(end, &end, 0); 2339 if (*end == 'K' || *end == 'k') 2340 p.fs.min_th *= 1024; 2341 } 2342 if ((end = strsep(&av[0], "/"))) { 2343 p.fs.max_th = strtoul(end, &end, 0); 2344 if (*end == 'K' || *end == 'k') 2345 p.fs.max_th *= 1024; 2346 } 2347 if ((end = strsep(&av[0], "/"))) { 2348 double max_p = strtod(end, NULL); 2349 if (max_p > 1 || max_p <= 0) 2350 errx(EX_DATAERR, "0 < max_p <= 1"); 2351 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2352 } 2353 ac--; av++; 2354 break; 2355 2356 case TOK_DROPTAIL: 2357 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2358 break; 2359 2360 case TOK_BW: 2361 NEED1("bw needs bandwidth or interface\n"); 2362 if (do_pipe != 1) 2363 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2364 /* 2365 * set clocking interface or bandwidth value 2366 */ 2367 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2368 int l = sizeof(p.if_name)-1; 2369 /* interface name */ 2370 strncpy(p.if_name, av[0], l); 2371 p.if_name[l] = '\0'; 2372 p.bandwidth = 0; 2373 } else { 2374 p.if_name[0] = '\0'; 2375 p.bandwidth = strtoul(av[0], &end, 0); 2376 if (*end == 'K' || *end == 'k') { 2377 end++; 2378 p.bandwidth *= 1000; 2379 } else if (*end == 'M') { 2380 end++; 2381 p.bandwidth *= 1000000; 2382 } 2383 if (*end == 'B' || !strncmp(end, "by", 2)) 2384 p.bandwidth *= 8; 2385 if (p.bandwidth < 0) 2386 errx(EX_DATAERR, "bandwidth too large"); 2387 } 2388 ac--; av++; 2389 break; 2390 2391 case TOK_DELAY: 2392 if (do_pipe != 1) 2393 errx(EX_DATAERR, "delay only valid for pipes"); 2394 NEED1("delay needs argument 0..10000ms\n"); 2395 p.delay = strtoul(av[0], NULL, 0); 2396 ac--; av++; 2397 break; 2398 2399 case TOK_WEIGHT: 2400 if (do_pipe == 1) 2401 errx(EX_DATAERR,"weight only valid for queues"); 2402 NEED1("weight needs argument 0..100\n"); 2403 p.fs.weight = strtoul(av[0], &end, 0); 2404 ac--; av++; 2405 break; 2406 2407 case TOK_PIPE: 2408 if (do_pipe == 1) 2409 errx(EX_DATAERR,"pipe only valid for queues"); 2410 NEED1("pipe needs pipe_number\n"); 2411 p.fs.parent_nr = strtoul(av[0], &end, 0); 2412 ac--; av++; 2413 break; 2414 2415 default: 2416 errx(EX_DATAERR, "unrecognised option ``%s''", *av); 2417 } 2418 } 2419 if (do_pipe == 1) { 2420 if (p.pipe_nr == 0) 2421 errx(EX_DATAERR, "pipe_nr must be > 0"); 2422 if (p.delay > 10000) 2423 errx(EX_DATAERR, "delay must be < 10000"); 2424 } else { /* do_pipe == 2, queue */ 2425 if (p.fs.parent_nr == 0) 2426 errx(EX_DATAERR, "pipe must be > 0"); 2427 if (p.fs.weight >100) 2428 errx(EX_DATAERR, "weight must be <= 100"); 2429 } 2430 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2431 if (p.fs.qsize > 1024*1024) 2432 errx(EX_DATAERR, "queue size must be < 1MB"); 2433 } else { 2434 if (p.fs.qsize > 100) 2435 errx(EX_DATAERR, "2 <= queue size <= 100"); 2436 } 2437 if (p.fs.flags_fs & DN_IS_RED) { 2438 size_t len; 2439 int lookup_depth, avg_pkt_size; 2440 double s, idle, weight, w_q; 2441 struct clockinfo ck; 2442 int t; 2443 2444 if (p.fs.min_th >= p.fs.max_th) 2445 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2446 p.fs.min_th, p.fs.max_th); 2447 if (p.fs.max_th == 0) 2448 errx(EX_DATAERR, "max_th must be > 0"); 2449 2450 len = sizeof(int); 2451 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2452 &lookup_depth, &len, NULL, 0) == -1) 2453 2454 errx(1, "sysctlbyname(\"%s\")", 2455 "net.inet.ip.dummynet.red_lookup_depth"); 2456 if (lookup_depth == 0) 2457 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2458 " must be greater than zero"); 2459 2460 len = sizeof(int); 2461 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2462 &avg_pkt_size, &len, NULL, 0) == -1) 2463 2464 errx(1, "sysctlbyname(\"%s\")", 2465 "net.inet.ip.dummynet.red_avg_pkt_size"); 2466 if (avg_pkt_size == 0) 2467 errx(EX_DATAERR, 2468 "net.inet.ip.dummynet.red_avg_pkt_size must" 2469 " be greater than zero"); 2470 2471 len = sizeof(struct clockinfo); 2472 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2473 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2474 2475 /* 2476 * Ticks needed for sending a medium-sized packet. 2477 * Unfortunately, when we are configuring a WF2Q+ queue, we 2478 * do not have bandwidth information, because that is stored 2479 * in the parent pipe, and also we have multiple queues 2480 * competing for it. So we set s=0, which is not very 2481 * correct. But on the other hand, why do we want RED with 2482 * WF2Q+ ? 2483 */ 2484 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2485 s = 0; 2486 else 2487 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2488 2489 /* 2490 * max idle time (in ticks) before avg queue size becomes 0. 2491 * NOTA: (3/w_q) is approx the value x so that 2492 * (1-w_q)^x < 10^-3. 2493 */ 2494 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2495 idle = s * 3. / w_q; 2496 p.fs.lookup_step = (int)idle / lookup_depth; 2497 if (!p.fs.lookup_step) 2498 p.fs.lookup_step = 1; 2499 weight = 1 - w_q; 2500 for (t = p.fs.lookup_step; t > 0; --t) 2501 weight *= weight; 2502 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2503 } 2504 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2505 if (i) 2506 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2507} 2508 2509static void 2510get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) 2511{ 2512 int i, l; 2513 2514 for (i=0; i<6; i++) 2515 addr[i] = mask[i] = 0; 2516 if (!strcmp(p, "any")) 2517 return; 2518 2519 for (i=0; *p && i<6;i++, p++) { 2520 addr[i] = strtol(p, &p, 16); 2521 if (*p != ':') /* we start with the mask */ 2522 break; 2523 } 2524 if (*p == '/') { /* mask len */ 2525 l = strtol(p+1, &p, 0); 2526 for (i=0; l>0; l -=8, i++) 2527 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2528 } else if (*p == '&') { /* mask */ 2529 for (i=0, p++; *p && i<6;i++, p++) { 2530 mask[i] = strtol(p, &p, 16); 2531 if (*p != ':') 2532 break; 2533 } 2534 } else if (*p == '\0') { 2535 for (i=0; i<6; i++) 2536 mask[i] = 0xff; 2537 } 2538 for (i=0; i<6; i++) 2539 addr[i] &= mask[i]; 2540} 2541 2542/* 2543 * helper function, updates the pointer to cmd with the length 2544 * of the current command, and also cleans up the first word of 2545 * the new command in case it has been clobbered before. 2546 */ 2547static ipfw_insn * 2548next_cmd(ipfw_insn *cmd) 2549{ 2550 cmd += F_LEN(cmd); 2551 bzero(cmd, sizeof(*cmd)); 2552 return cmd; 2553} 2554 2555/* 2556 * Takes arguments and copies them into a comment 2557 */ 2558static void 2559fill_comment(ipfw_insn *cmd, int ac, char **av) 2560{ 2561 int i, l; 2562 char *p = (char *)(cmd + 1); 2563 2564 cmd->opcode = O_NOP; 2565 cmd->len = (cmd->len & (F_NOT | F_OR)); 2566 2567 /* Compute length of comment string. */ 2568 for (i = 0, l = 0; i < ac; i++) 2569 l += strlen(av[i]) + 1; 2570 if (l == 0) 2571 return; 2572 if (l > 84) 2573 errx(EX_DATAERR, 2574 "comment too long (max 80 chars)"); 2575 l = 1 + (l+3)/4; 2576 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2577 for (i = 0; i < ac; i++) { 2578 strcpy(p, av[i]); 2579 p += strlen(av[i]); 2580 *p++ = ' '; 2581 } 2582 *(--p) = '\0'; 2583} 2584 2585/* 2586 * A function to fill simple commands of size 1. 2587 * Existing flags are preserved. 2588 */ 2589static void 2590fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2591{ 2592 cmd->opcode = opcode; 2593 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2594 cmd->arg1 = arg; 2595} 2596 2597/* 2598 * Fetch and add the MAC address and type, with masks. This generates one or 2599 * two microinstructions, and returns the pointer to the last one. 2600 */ 2601static ipfw_insn * 2602add_mac(ipfw_insn *cmd, int ac, char *av[]) 2603{ 2604 ipfw_insn_mac *mac; 2605 2606 if (ac < 2) 2607 errx(EX_DATAERR, "MAC dst src"); 2608 2609 cmd->opcode = O_MACADDR2; 2610 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2611 2612 mac = (ipfw_insn_mac *)cmd; 2613 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2614 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2615 return cmd; 2616} 2617 2618static ipfw_insn * 2619add_mactype(ipfw_insn *cmd, int ac, char *av) 2620{ 2621 if (ac < 1) 2622 errx(EX_DATAERR, "missing MAC type"); 2623 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2624 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2625 cmd->opcode = O_MAC_TYPE; 2626 return cmd; 2627 } else 2628 return NULL; 2629} 2630 2631static ipfw_insn * 2632add_proto(ipfw_insn *cmd, char *av) 2633{ 2634 struct protoent *pe; 2635 u_char proto = 0; 2636 2637 if (!strncmp(av, "all", strlen(av))) 2638 ; /* same as "ip" */ 2639 else if ((proto = atoi(av)) > 0) 2640 ; /* all done! */ 2641 else if ((pe = getprotobyname(av)) != NULL) 2642 proto = pe->p_proto; 2643 else 2644 return NULL; 2645 if (proto != IPPROTO_IP) 2646 fill_cmd(cmd, O_PROTO, 0, proto); 2647 return cmd; 2648} 2649 2650static ipfw_insn * 2651add_srcip(ipfw_insn *cmd, char *av) 2652{ 2653 fill_ip((ipfw_insn_ip *)cmd, av); 2654 if (cmd->opcode == O_IP_DST_SET) /* set */ 2655 cmd->opcode = O_IP_SRC_SET; 2656 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2657 cmd->opcode = O_IP_SRC_ME; 2658 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2659 cmd->opcode = O_IP_SRC; 2660 else /* addr/mask */ 2661 cmd->opcode = O_IP_SRC_MASK; 2662 return cmd; 2663} 2664 2665static ipfw_insn * 2666add_dstip(ipfw_insn *cmd, char *av) 2667{ 2668 fill_ip((ipfw_insn_ip *)cmd, av); 2669 if (cmd->opcode == O_IP_DST_SET) /* set */ 2670 ; 2671 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2672 cmd->opcode = O_IP_DST_ME; 2673 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2674 cmd->opcode = O_IP_DST; 2675 else /* addr/mask */ 2676 cmd->opcode = O_IP_DST_MASK; 2677 return cmd; 2678} 2679 2680static ipfw_insn * 2681add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2682{ 2683 if (!strncmp(av, "any", strlen(av))) { 2684 return NULL; 2685 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2686 /* XXX todo: check that we have a protocol with ports */ 2687 cmd->opcode = opcode; 2688 return cmd; 2689 } 2690 return NULL; 2691} 2692 2693/* 2694 * Parse arguments and assemble the microinstructions which make up a rule. 2695 * Rules are added into the 'rulebuf' and then copied in the correct order 2696 * into the actual rule. 2697 * 2698 * The syntax for a rule starts with the action, followed by an 2699 * optional log action, and the various match patterns. 2700 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2701 * (generated if the rule includes a keep-state option), then the 2702 * various match patterns, the "log" action, and the actual action. 2703 * 2704 */ 2705static void 2706add(int ac, char *av[]) 2707{ 2708 /* 2709 * rules are added into the 'rulebuf' and then copied in 2710 * the correct order into the actual rule. 2711 * Some things that need to go out of order (prob, action etc.) 2712 * go into actbuf[]. 2713 */ 2714 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2715 2716 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2717 ipfw_insn *first_cmd; /* first match pattern */ 2718 2719 struct ip_fw *rule; 2720 2721 /* 2722 * various flags used to record that we entered some fields. 2723 */ 2724 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2725 2726 int i; 2727 2728 int open_par = 0; /* open parenthesis ( */ 2729 2730 /* proto is here because it is used to fetch ports */ 2731 u_char proto = IPPROTO_IP; /* default protocol */ 2732 2733 double match_prob = 1; /* match probability, default is always match */ 2734 2735 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2736 bzero(cmdbuf, sizeof(cmdbuf)); 2737 bzero(rulebuf, sizeof(rulebuf)); 2738 2739 rule = (struct ip_fw *)rulebuf; 2740 cmd = (ipfw_insn *)cmdbuf; 2741 action = (ipfw_insn *)actbuf; 2742 2743 av++; ac--; 2744 2745 /* [rule N] -- Rule number optional */ 2746 if (ac && isdigit(**av)) { 2747 rule->rulenum = atoi(*av); 2748 av++; 2749 ac--; 2750 } 2751 2752 /* [set N] -- set number (0..RESVD_SET), optional */ 2753 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2754 int set = strtoul(av[1], NULL, 10); 2755 if (set < 0 || set > RESVD_SET) 2756 errx(EX_DATAERR, "illegal set %s", av[1]); 2757 rule->set = set; 2758 av += 2; ac -= 2; 2759 } 2760 2761 /* [prob D] -- match probability, optional */ 2762 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2763 match_prob = strtod(av[1], NULL); 2764 2765 if (match_prob <= 0 || match_prob > 1) 2766 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2767 av += 2; ac -= 2; 2768 } 2769 2770 /* action -- mandatory */ 2771 NEED1("missing action"); 2772 i = match_token(rule_actions, *av); 2773 ac--; av++; 2774 action->len = 1; /* default */ 2775 switch(i) { 2776 case TOK_CHECKSTATE: 2777 have_state = action; 2778 action->opcode = O_CHECK_STATE; 2779 break; 2780 2781 case TOK_ACCEPT: 2782 action->opcode = O_ACCEPT; 2783 break; 2784 2785 case TOK_DENY: 2786 action->opcode = O_DENY; 2787 action->arg1 = 0; 2788 break; 2789 2790 case TOK_REJECT: 2791 action->opcode = O_REJECT; 2792 action->arg1 = ICMP_UNREACH_HOST; 2793 break; 2794 2795 case TOK_RESET: 2796 action->opcode = O_REJECT; 2797 action->arg1 = ICMP_REJECT_RST; 2798 break; 2799 2800 case TOK_UNREACH: 2801 action->opcode = O_REJECT; 2802 NEED1("missing reject code"); 2803 fill_reject_code(&action->arg1, *av); 2804 ac--; av++; 2805 break; 2806 2807 case TOK_COUNT: 2808 action->opcode = O_COUNT; 2809 break; 2810 2811 case TOK_QUEUE: 2812 case TOK_PIPE: 2813 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2814 case TOK_SKIPTO: 2815 if (i == TOK_QUEUE) 2816 action->opcode = O_QUEUE; 2817 else if (i == TOK_PIPE) 2818 action->opcode = O_PIPE; 2819 else if (i == TOK_SKIPTO) 2820 action->opcode = O_SKIPTO; 2821 NEED1("missing skipto/pipe/queue number"); 2822 action->arg1 = strtoul(*av, NULL, 10); 2823 av++; ac--; 2824 break; 2825 2826 case TOK_DIVERT: 2827 case TOK_TEE: 2828 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2829 NEED1("missing divert/tee port"); 2830 action->arg1 = strtoul(*av, NULL, 0); 2831 if (action->arg1 == 0) { 2832 struct servent *s; 2833 setservent(1); 2834 s = getservbyname(av[0], "divert"); 2835 if (s != NULL) 2836 action->arg1 = ntohs(s->s_port); 2837 else 2838 errx(EX_DATAERR, "illegal divert/tee port"); 2839 } 2840 ac--; av++; 2841 break; 2842 2843 case TOK_FORWARD: { 2844 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2845 char *s, *end; 2846 2847 NEED1("missing forward address[:port]"); 2848 2849 action->opcode = O_FORWARD_IP; 2850 action->len = F_INSN_SIZE(ipfw_insn_sa); 2851 2852 p->sa.sin_len = sizeof(struct sockaddr_in); 2853 p->sa.sin_family = AF_INET; 2854 p->sa.sin_port = 0; 2855 /* 2856 * locate the address-port separator (':' or ',') 2857 */ 2858 s = strchr(*av, ':'); 2859 if (s == NULL) 2860 s = strchr(*av, ','); 2861 if (s != NULL) { 2862 *(s++) = '\0'; 2863 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2864 if (s == end) 2865 errx(EX_DATAERR, 2866 "illegal forwarding port ``%s''", s); 2867 p->sa.sin_port = (u_short)i; 2868 } 2869 lookup_host(*av, &(p->sa.sin_addr)); 2870 } 2871 ac--; av++; 2872 break; 2873 2874 case TOK_COMMENT: 2875 /* pretend it is a 'count' rule followed by the comment */ 2876 action->opcode = O_COUNT; 2877 ac++; av--; /* go back... */ 2878 break; 2879 2880 default: 2881 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2882 } 2883 action = next_cmd(action); 2884 2885 /* 2886 * [log [logamount N]] -- log, optional 2887 * 2888 * If exists, it goes first in the cmdbuf, but then it is 2889 * skipped in the copy section to the end of the buffer. 2890 */ 2891 if (ac && !strncmp(*av, "log", strlen(*av))) { 2892 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2893 int l; 2894 2895 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2896 cmd->opcode = O_LOG; 2897 av++; ac--; 2898 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2899 ac--; av++; 2900 NEED1("logamount requires argument"); 2901 l = atoi(*av); 2902 if (l < 0) 2903 errx(EX_DATAERR, "logamount must be positive"); 2904 c->max_log = l; 2905 ac--; av++; 2906 } 2907 cmd = next_cmd(cmd); 2908 } 2909 2910 if (have_state) /* must be a check-state, we are done */ 2911 goto done; 2912 2913#define OR_START(target) \ 2914 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2915 if (open_par) \ 2916 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2917 prev = NULL; \ 2918 open_par = 1; \ 2919 if ( (av[0])[1] == '\0') { \ 2920 ac--; av++; \ 2921 } else \ 2922 (*av)++; \ 2923 } \ 2924 target: \ 2925 2926 2927#define CLOSE_PAR \ 2928 if (open_par) { \ 2929 if (ac && ( \ 2930 !strncmp(*av, ")", strlen(*av)) || \ 2931 !strncmp(*av, "}", strlen(*av)) )) { \ 2932 prev = NULL; \ 2933 open_par = 0; \ 2934 ac--; av++; \ 2935 } else \ 2936 errx(EX_USAGE, "missing \")\"\n"); \ 2937 } 2938 2939#define NOT_BLOCK \ 2940 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2941 if (cmd->len & F_NOT) \ 2942 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2943 cmd->len |= F_NOT; \ 2944 ac--; av++; \ 2945 } 2946 2947#define OR_BLOCK(target) \ 2948 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2949 if (prev == NULL || open_par == 0) \ 2950 errx(EX_DATAERR, "invalid OR block"); \ 2951 prev->len |= F_OR; \ 2952 ac--; av++; \ 2953 goto target; \ 2954 } \ 2955 CLOSE_PAR; 2956 2957 first_cmd = cmd; 2958 2959#if 0 2960 /* 2961 * MAC addresses, optional. 2962 * If we have this, we skip the part "proto from src to dst" 2963 * and jump straight to the option parsing. 2964 */ 2965 NOT_BLOCK; 2966 NEED1("missing protocol"); 2967 if (!strncmp(*av, "MAC", strlen(*av)) || 2968 !strncmp(*av, "mac", strlen(*av))) { 2969 ac--; av++; /* the "MAC" keyword */ 2970 add_mac(cmd, ac, av); /* exits in case of errors */ 2971 cmd = next_cmd(cmd); 2972 ac -= 2; av += 2; /* dst-mac and src-mac */ 2973 NOT_BLOCK; 2974 NEED1("missing mac type"); 2975 if (add_mactype(cmd, ac, av[0])) 2976 cmd = next_cmd(cmd); 2977 ac--; av++; /* any or mac-type */ 2978 goto read_options; 2979 } 2980#endif 2981 2982 /* 2983 * protocol, mandatory 2984 */ 2985 OR_START(get_proto); 2986 NOT_BLOCK; 2987 NEED1("missing protocol"); 2988 if (add_proto(cmd, *av)) { 2989 av++; ac--; 2990 if (F_LEN(cmd) == 0) /* plain IP */ 2991 proto = 0; 2992 else { 2993 proto = cmd->arg1; 2994 prev = cmd; 2995 cmd = next_cmd(cmd); 2996 } 2997 } else if (first_cmd != cmd) { 2998 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 2999 } else 3000 goto read_options; 3001 OR_BLOCK(get_proto); 3002 3003 /* 3004 * "from", mandatory 3005 */ 3006 if (!ac || strncmp(*av, "from", strlen(*av))) 3007 errx(EX_USAGE, "missing ``from''"); 3008 ac--; av++; 3009 3010 /* 3011 * source IP, mandatory 3012 */ 3013 OR_START(source_ip); 3014 NOT_BLOCK; /* optional "not" */ 3015 NEED1("missing source address"); 3016 if (add_srcip(cmd, *av)) { 3017 ac--; av++; 3018 if (F_LEN(cmd) != 0) { /* ! any */ 3019 prev = cmd; 3020 cmd = next_cmd(cmd); 3021 } 3022 } 3023 OR_BLOCK(source_ip); 3024 3025 /* 3026 * source ports, optional 3027 */ 3028 NOT_BLOCK; /* optional "not" */ 3029 if (ac) { 3030 if (!strncmp(*av, "any", strlen(*av)) || 3031 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3032 ac--; av++; 3033 if (F_LEN(cmd) != 0) 3034 cmd = next_cmd(cmd); 3035 } 3036 } 3037 3038 /* 3039 * "to", mandatory 3040 */ 3041 if (!ac || strncmp(*av, "to", strlen(*av))) 3042 errx(EX_USAGE, "missing ``to''"); 3043 av++; ac--; 3044 3045 /* 3046 * destination, mandatory 3047 */ 3048 OR_START(dest_ip); 3049 NOT_BLOCK; /* optional "not" */ 3050 NEED1("missing dst address"); 3051 if (add_dstip(cmd, *av)) { 3052 ac--; av++; 3053 if (F_LEN(cmd) != 0) { /* ! any */ 3054 prev = cmd; 3055 cmd = next_cmd(cmd); 3056 } 3057 } 3058 OR_BLOCK(dest_ip); 3059 3060 /* 3061 * dest. ports, optional 3062 */ 3063 NOT_BLOCK; /* optional "not" */ 3064 if (ac) { 3065 if (!strncmp(*av, "any", strlen(*av)) || 3066 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3067 ac--; av++; 3068 if (F_LEN(cmd) != 0) 3069 cmd = next_cmd(cmd); 3070 } 3071 } 3072 3073read_options: 3074 if (ac && first_cmd == cmd) { 3075 /* 3076 * nothing specified so far, store in the rule to ease 3077 * printout later. 3078 */ 3079 rule->_pad = 1; 3080 } 3081 prev = NULL; 3082 while (ac) { 3083 char *s; 3084 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3085 3086 s = *av; 3087 cmd32 = (ipfw_insn_u32 *)cmd; 3088 3089 if (*s == '!') { /* alternate syntax for NOT */ 3090 if (cmd->len & F_NOT) 3091 errx(EX_USAGE, "double \"not\" not allowed\n"); 3092 cmd->len = F_NOT; 3093 s++; 3094 } 3095 i = match_token(rule_options, s); 3096 ac--; av++; 3097 switch(i) { 3098 case TOK_NOT: 3099 if (cmd->len & F_NOT) 3100 errx(EX_USAGE, "double \"not\" not allowed\n"); 3101 cmd->len = F_NOT; 3102 break; 3103 3104 case TOK_OR: 3105 if (open_par == 0 || prev == NULL) 3106 errx(EX_USAGE, "invalid \"or\" block\n"); 3107 prev->len |= F_OR; 3108 break; 3109 3110 case TOK_STARTBRACE: 3111 if (open_par) 3112 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3113 open_par = 1; 3114 break; 3115 3116 case TOK_ENDBRACE: 3117 if (!open_par) 3118 errx(EX_USAGE, "+missing \")\"\n"); 3119 open_par = 0; 3120 prev = NULL; 3121 break; 3122 3123 case TOK_IN: 3124 fill_cmd(cmd, O_IN, 0, 0); 3125 break; 3126 3127 case TOK_OUT: 3128 cmd->len ^= F_NOT; /* toggle F_NOT */ 3129 fill_cmd(cmd, O_IN, 0, 0); 3130 break; 3131 3132 case TOK_FRAG: 3133 fill_cmd(cmd, O_FRAG, 0, 0); 3134 break; 3135 3136 case TOK_LAYER2: 3137 fill_cmd(cmd, O_LAYER2, 0, 0); 3138 break; 3139 3140 case TOK_XMIT: 3141 case TOK_RECV: 3142 case TOK_VIA: 3143 NEED1("recv, xmit, via require interface name" 3144 " or address"); 3145 fill_iface((ipfw_insn_if *)cmd, av[0]); 3146 ac--; av++; 3147 if (F_LEN(cmd) == 0) /* not a valid address */ 3148 break; 3149 if (i == TOK_XMIT) 3150 cmd->opcode = O_XMIT; 3151 else if (i == TOK_RECV) 3152 cmd->opcode = O_RECV; 3153 else if (i == TOK_VIA) 3154 cmd->opcode = O_VIA; 3155 break; 3156 3157 case TOK_ICMPTYPES: 3158 NEED1("icmptypes requires list of types"); 3159 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3160 av++; ac--; 3161 break; 3162 3163 case TOK_IPTTL: 3164 NEED1("ipttl requires TTL"); 3165 if (strpbrk(*av, "-,")) { 3166 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3167 errx(EX_DATAERR, "invalid ipttl %s", *av); 3168 } else 3169 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3170 ac--; av++; 3171 break; 3172 3173 case TOK_IPID: 3174 NEED1("ipid requires id"); 3175 if (strpbrk(*av, "-,")) { 3176 if (!add_ports(cmd, *av, 0, O_IPID)) 3177 errx(EX_DATAERR, "invalid ipid %s", *av); 3178 } else 3179 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3180 ac--; av++; 3181 break; 3182 3183 case TOK_IPLEN: 3184 NEED1("iplen requires length"); 3185 if (strpbrk(*av, "-,")) { 3186 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3187 errx(EX_DATAERR, "invalid ip len %s", *av); 3188 } else 3189 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3190 ac--; av++; 3191 break; 3192 3193 case TOK_IPVER: 3194 NEED1("ipver requires version"); 3195 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3196 ac--; av++; 3197 break; 3198 3199 case TOK_IPPRECEDENCE: 3200 NEED1("ipprecedence requires value"); 3201 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3202 (strtoul(*av, NULL, 0) & 7) << 5); 3203 ac--; av++; 3204 break; 3205 3206 case TOK_IPOPTS: 3207 NEED1("missing argument for ipoptions"); 3208 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3209 ac--; av++; 3210 break; 3211 3212 case TOK_IPTOS: 3213 NEED1("missing argument for iptos"); 3214 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3215 ac--; av++; 3216 break; 3217 3218 case TOK_UID: 3219 NEED1("uid requires argument"); 3220 { 3221 char *end; 3222 uid_t uid; 3223 struct passwd *pwd; 3224 3225 cmd->opcode = O_UID; 3226 uid = strtoul(*av, &end, 0); 3227 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3228 if (pwd == NULL) 3229 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3230 cmd32->d[0] = pwd->pw_uid; 3231 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3232 ac--; av++; 3233 } 3234 break; 3235 3236 case TOK_GID: 3237 NEED1("gid requires argument"); 3238 { 3239 char *end; 3240 gid_t gid; 3241 struct group *grp; 3242 3243 cmd->opcode = O_GID; 3244 gid = strtoul(*av, &end, 0); 3245 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3246 if (grp == NULL) 3247 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3248 cmd32->d[0] = grp->gr_gid; 3249 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3250 ac--; av++; 3251 } 3252 break; 3253 3254 case TOK_ESTAB: 3255 fill_cmd(cmd, O_ESTAB, 0, 0); 3256 break; 3257 3258 case TOK_SETUP: 3259 fill_cmd(cmd, O_TCPFLAGS, 0, 3260 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3261 break; 3262 3263 case TOK_TCPOPTS: 3264 NEED1("missing argument for tcpoptions"); 3265 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3266 ac--; av++; 3267 break; 3268 3269 case TOK_TCPSEQ: 3270 case TOK_TCPACK: 3271 NEED1("tcpseq/tcpack requires argument"); 3272 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3273 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3274 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3275 ac--; av++; 3276 break; 3277 3278 case TOK_TCPWIN: 3279 NEED1("tcpwin requires length"); 3280 fill_cmd(cmd, O_TCPWIN, 0, 3281 htons(strtoul(*av, NULL, 0))); 3282 ac--; av++; 3283 break; 3284 3285 case TOK_TCPFLAGS: 3286 NEED1("missing argument for tcpflags"); 3287 cmd->opcode = O_TCPFLAGS; 3288 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3289 ac--; av++; 3290 break; 3291 3292 case TOK_KEEPSTATE: 3293 if (open_par) 3294 errx(EX_USAGE, "keep-state cannot be part " 3295 "of an or block"); 3296 if (have_state) 3297 errx(EX_USAGE, "only one of keep-state " 3298 "and limit is allowed"); 3299 have_state = cmd; 3300 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3301 break; 3302 3303 case TOK_LIMIT: 3304 if (open_par) 3305 errx(EX_USAGE, "limit cannot be part " 3306 "of an or block"); 3307 if (have_state) 3308 errx(EX_USAGE, "only one of keep-state " 3309 "and limit is allowed"); 3310 NEED1("limit needs mask and # of connections"); 3311 have_state = cmd; 3312 { 3313 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3314 3315 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3316 cmd->opcode = O_LIMIT; 3317 c->limit_mask = 0; 3318 c->conn_limit = 0; 3319 for (; ac >1 ;) { 3320 int val; 3321 3322 val = match_token(limit_masks, *av); 3323 if (val <= 0) 3324 break; 3325 c->limit_mask |= val; 3326 ac--; av++; 3327 } 3328 c->conn_limit = atoi(*av); 3329 if (c->conn_limit == 0) 3330 errx(EX_USAGE, "limit: limit must be >0"); 3331 if (c->limit_mask == 0) 3332 errx(EX_USAGE, "missing limit mask"); 3333 ac--; av++; 3334 } 3335 break; 3336 3337 case TOK_PROTO: 3338 NEED1("missing protocol"); 3339 if (add_proto(cmd, *av)) { 3340 proto = cmd->arg1; 3341 ac--; av++; 3342 } else 3343 errx(EX_DATAERR, "invalid protocol ``%s''", 3344 *av); 3345 break; 3346 3347 case TOK_SRCIP: 3348 NEED1("missing source IP"); 3349 if (add_srcip(cmd, *av)) { 3350 ac--; av++; 3351 } 3352 break; 3353 3354 case TOK_DSTIP: 3355 NEED1("missing destination IP"); 3356 if (add_dstip(cmd, *av)) { 3357 ac--; av++; 3358 } 3359 break; 3360 3361 case TOK_SRCPORT: 3362 NEED1("missing source port"); 3363 if (!strncmp(*av, "any", strlen(*av)) || 3364 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3365 ac--; av++; 3366 } else 3367 errx(EX_DATAERR, "invalid source port %s", *av); 3368 break; 3369 3370 case TOK_DSTPORT: 3371 NEED1("missing destination port"); 3372 if (!strncmp(*av, "any", strlen(*av)) || 3373 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3374 ac--; av++; 3375 } else 3376 errx(EX_DATAERR, "invalid destination port %s", 3377 *av); 3378 break; 3379 3380 case TOK_MAC: 3381 if (ac < 2) 3382 errx(EX_USAGE, "MAC dst-mac src-mac"); 3383 if (add_mac(cmd, ac, av)) { 3384 ac -= 2; av += 2; 3385 } 3386 break; 3387 3388 case TOK_MACTYPE: 3389 NEED1("missing mac type"); 3390 if (!add_mactype(cmd, ac, *av)) 3391 errx(EX_DATAERR, "invalid mac type %s", *av); 3392 ac--; av++; 3393 break; 3394 3395 case TOK_VERREVPATH: 3396 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3397 break; 3398 3399 case TOK_IPSEC: 3400 fill_cmd(cmd, O_IPSEC, 0, 0); 3401 break; 3402 3403 case TOK_COMMENT: 3404 fill_comment(cmd, ac, av); 3405 av += ac; 3406 ac = 0; 3407 break; 3408 3409 default: 3410 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3411 } 3412 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3413 prev = cmd; 3414 cmd = next_cmd(cmd); 3415 } 3416 } 3417 3418done: 3419 /* 3420 * Now copy stuff into the rule. 3421 * If we have a keep-state option, the first instruction 3422 * must be a PROBE_STATE (which is generated here). 3423 * If we have a LOG option, it was stored as the first command, 3424 * and now must be moved to the top of the action part. 3425 */ 3426 dst = (ipfw_insn *)rule->cmd; 3427 3428 /* 3429 * First thing to write into the command stream is the match probability. 3430 */ 3431 if (match_prob != 1) { /* 1 means always match */ 3432 dst->opcode = O_PROB; 3433 dst->len = 2; 3434 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3435 dst += dst->len; 3436 } 3437 3438 /* 3439 * generate O_PROBE_STATE if necessary 3440 */ 3441 if (have_state && have_state->opcode != O_CHECK_STATE) { 3442 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3443 dst = next_cmd(dst); 3444 } 3445 /* 3446 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3447 */ 3448 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3449 i = F_LEN(src); 3450 3451 switch (src->opcode) { 3452 case O_LOG: 3453 case O_KEEP_STATE: 3454 case O_LIMIT: 3455 break; 3456 default: 3457 bcopy(src, dst, i * sizeof(uint32_t)); 3458 dst += i; 3459 } 3460 } 3461 3462 /* 3463 * put back the have_state command as last opcode 3464 */ 3465 if (have_state && have_state->opcode != O_CHECK_STATE) { 3466 i = F_LEN(have_state); 3467 bcopy(have_state, dst, i * sizeof(uint32_t)); 3468 dst += i; 3469 } 3470 /* 3471 * start action section 3472 */ 3473 rule->act_ofs = dst - rule->cmd; 3474 3475 /* 3476 * put back O_LOG if necessary 3477 */ 3478 src = (ipfw_insn *)cmdbuf; 3479 if (src->opcode == O_LOG) { 3480 i = F_LEN(src); 3481 bcopy(src, dst, i * sizeof(uint32_t)); 3482 dst += i; 3483 } 3484 /* 3485 * copy all other actions 3486 */ 3487 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3488 i = F_LEN(src); 3489 bcopy(src, dst, i * sizeof(uint32_t)); 3490 dst += i; 3491 } 3492 3493 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3494 i = (char *)dst - (char *)rule; 3495 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3496 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3497 if (!do_quiet) 3498 show_ipfw(rule, 0, 0); 3499} 3500 3501static void 3502zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3503{ 3504 int rulenum; 3505 int failed = EX_OK; 3506 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3507 3508 av++; ac--; 3509 3510 if (!ac) { 3511 /* clear all entries */ 3512 if (do_cmd(optname, NULL, 0) < 0) 3513 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3514 if (!do_quiet) 3515 printf("%s.\n", optname == IP_FW_ZERO ? 3516 "Accounting cleared":"Logging counts reset"); 3517 3518 return; 3519 } 3520 3521 while (ac) { 3522 /* Rule number */ 3523 if (isdigit(**av)) { 3524 rulenum = atoi(*av); 3525 av++; 3526 ac--; 3527 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3528 warn("rule %u: setsockopt(IP_FW_%s)", 3529 rulenum, name); 3530 failed = EX_UNAVAILABLE; 3531 } else if (!do_quiet) 3532 printf("Entry %d %s.\n", rulenum, 3533 optname == IP_FW_ZERO ? 3534 "cleared" : "logging count reset"); 3535 } else { 3536 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3537 } 3538 } 3539 if (failed != EX_OK) 3540 exit(failed); 3541} 3542 3543static void 3544flush(int force) 3545{ 3546 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3547 3548 if (!force && !do_quiet) { /* need to ask user */ 3549 int c; 3550 3551 printf("Are you sure? [yn] "); 3552 fflush(stdout); 3553 do { 3554 c = toupper(getc(stdin)); 3555 while (c != '\n' && getc(stdin) != '\n') 3556 if (feof(stdin)) 3557 return; /* and do not flush */ 3558 } while (c != 'Y' && c != 'N'); 3559 printf("\n"); 3560 if (c == 'N') /* user said no */ 3561 return; 3562 } 3563 if (do_cmd(cmd, NULL, 0) < 0) 3564 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3565 do_pipe ? "DUMMYNET" : "FW"); 3566 if (!do_quiet) 3567 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3568} 3569 3570/* 3571 * Free a the (locally allocated) copy of command line arguments. 3572 */ 3573static void 3574free_args(int ac, char **av) 3575{ 3576 int i; 3577 3578 for (i=0; i < ac; i++) 3579 free(av[i]); 3580 free(av); 3581} 3582 3583/* 3584 * Called with the arguments (excluding program name). 3585 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 3586 */ 3587static int 3588ipfw_main(int oldac, char **oldav) 3589{ 3590 int ch, ac, save_ac; 3591 char **av, **save_av; 3592 int do_acct = 0; /* Show packet/byte count */ 3593 int do_force = 0; /* Don't ask for confirmation */ 3594 3595#define WHITESP " \t\f\v\n\r" 3596 if (oldac == 0) 3597 return 1; 3598 else if (oldac == 1) { 3599 /* 3600 * If we are called with a single string, try to split it into 3601 * arguments for subsequent parsing. 3602 * But first, remove spaces after a ',', by copying the string 3603 * in-place. 3604 */ 3605 char *arg = oldav[0]; /* The string... */ 3606 int l = strlen(arg); 3607 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3608 int i, j; 3609 for (i = j = 0; i < l; i++) { 3610 if (arg[i] == '#') /* comment marker */ 3611 break; 3612 if (copy) { 3613 arg[j++] = arg[i]; 3614 copy = !index("," WHITESP, arg[i]); 3615 } else { 3616 copy = !index(WHITESP, arg[i]); 3617 if (copy) 3618 arg[j++] = arg[i]; 3619 } 3620 } 3621 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3622 j--; 3623 l = j; /* the new argument length */ 3624 arg[j++] = '\0'; 3625 if (l == 0) /* empty string! */ 3626 return 1; 3627 3628 /* 3629 * First, count number of arguments. Because of the previous 3630 * processing, this is just the number of blanks plus 1. 3631 */ 3632 for (i = 0, ac = 1; i < l; i++) 3633 if (index(WHITESP, arg[i]) != NULL) 3634 ac++; 3635 3636 av = calloc(ac, sizeof(char *)); 3637 3638 /* 3639 * Second, copy arguments from cmd[] to av[]. For each one, 3640 * j is the initial character, i is the one past the end. 3641 */ 3642 for (ac = 0, i = j = 0; i < l; i++) 3643 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3644 if (i == l-1) 3645 i++; 3646 av[ac] = calloc(i-j+1, 1); 3647 bcopy(arg+j, av[ac], i-j); 3648 ac++; 3649 j = i + 1; 3650 } 3651 } else { 3652 /* 3653 * If an argument ends with ',' join with the next one. 3654 */ 3655 int first, i, l; 3656 3657 av = calloc(oldac, sizeof(char *)); 3658 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3659 char *arg = oldav[i]; 3660 int k = strlen(arg); 3661 3662 l += k; 3663 if (arg[k-1] != ',' || i == oldac-1) { 3664 /* Time to copy. */ 3665 av[ac] = calloc(l+1, 1); 3666 for (l=0; first <= i; first++) { 3667 strcat(av[ac]+l, oldav[first]); 3668 l += strlen(oldav[first]); 3669 } 3670 ac++; 3671 l = 0; 3672 first = i+1; 3673 } 3674 } 3675 } 3676 3677 /* Set the force flag for non-interactive processes */ 3678 do_force = !isatty(STDIN_FILENO); 3679 3680 /* Save arguments for final freeing of memory. */ 3681 save_ac = ac; 3682 save_av = av; 3683 3684 optind = optreset = 0; 3685 while ((ch = getopt(ac, av, "acdefhnNqs:STtv")) != -1) 3686 switch (ch) { 3687 case 'a': 3688 do_acct = 1; 3689 break; 3690 3691 case 'c': 3692 do_compact = 1; 3693 break; 3694 3695 case 'd': 3696 do_dynamic = 1; 3697 break; 3698 3699 case 'e': 3700 do_expired = 1; 3701 break; 3702 3703 case 'f': 3704 do_force = 1; 3705 break; 3706 3707 case 'h': /* help */ 3708 free_args(save_ac, save_av); 3709 help(); 3710 break; /* NOTREACHED */ 3711 3712 case 'n': 3713 test_only = 1; 3714 break; 3715 3716 case 'N': 3717 do_resolv = 1; 3718 break; 3719 3720 case 'q': 3721 do_quiet = 1; 3722 break; 3723 3724 case 's': /* sort */ 3725 do_sort = atoi(optarg); 3726 break; 3727 3728 case 'S': 3729 show_sets = 1; 3730 break; 3731 3732 case 't': 3733 do_time = 1; 3734 break; 3735 3736 case 'T': 3737 do_time = 2; /* numeric timestamp */ 3738 break; 3739 3740 case 'v': /* verbose */ 3741 verbose = 1; 3742 break; 3743 3744 default: 3745 free_args(save_ac, save_av); 3746 return 1; 3747 } 3748 3749 ac -= optind; 3750 av += optind; 3751 NEED1("bad arguments, for usage summary ``ipfw''"); 3752 3753 /* 3754 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 3755 * e.g. "100 add allow ..." instead of "add 100 allow ...". 3756 * In case, swap first and second argument to get the normal form. 3757 */ 3758 if (ac > 1 && isdigit(*av[0])) { 3759 char *p = av[0]; 3760 3761 av[0] = av[1]; 3762 av[1] = p; 3763 } 3764 3765 /* 3766 * optional: pipe or queue 3767 */ 3768 do_pipe = 0; 3769 if (!strncmp(*av, "pipe", strlen(*av))) 3770 do_pipe = 1; 3771 else if (!strncmp(*av, "queue", strlen(*av))) 3772 do_pipe = 2; 3773 if (do_pipe) { 3774 ac--; 3775 av++; 3776 } 3777 NEED1("missing command"); 3778 3779 /* 3780 * For pipes and queues we normally say 'pipe NN config' 3781 * but the code is easier to parse as 'pipe config NN' 3782 * so we swap the two arguments. 3783 */ 3784 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3785 char *p = av[0]; 3786 3787 av[0] = av[1]; 3788 av[1] = p; 3789 } 3790 3791 if (!strncmp(*av, "add", strlen(*av))) 3792 add(ac, av); 3793 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3794 config_pipe(ac, av); 3795 else if (!strncmp(*av, "delete", strlen(*av))) 3796 delete(ac, av); 3797 else if (!strncmp(*av, "flush", strlen(*av))) 3798 flush(do_force); 3799 else if (!strncmp(*av, "zero", strlen(*av))) 3800 zero(ac, av, IP_FW_ZERO); 3801 else if (!strncmp(*av, "resetlog", strlen(*av))) 3802 zero(ac, av, IP_FW_RESETLOG); 3803 else if (!strncmp(*av, "print", strlen(*av)) || 3804 !strncmp(*av, "list", strlen(*av))) 3805 list(ac, av, do_acct); 3806 else if (!strncmp(*av, "set", strlen(*av))) 3807 sets_handler(ac, av); 3808 else if (!strncmp(*av, "enable", strlen(*av))) 3809 sysctl_handler(ac, av, 1); 3810 else if (!strncmp(*av, "disable", strlen(*av))) 3811 sysctl_handler(ac, av, 0); 3812 else if (!strncmp(*av, "show", strlen(*av))) 3813 list(ac, av, 1 /* show counters */); 3814 else 3815 errx(EX_USAGE, "bad command `%s'", *av); 3816 3817 /* Free memory allocated in the argument parsing. */ 3818 free_args(save_ac, save_av); 3819 return 0; 3820} 3821 3822 3823static void 3824ipfw_readfile(int ac, char *av[]) 3825{ 3826#define MAX_ARGS 32 3827 char buf[BUFSIZ]; 3828 char *cmd = NULL, *filename = av[ac-1]; 3829 int c, lineno=0; 3830 FILE *f = NULL; 3831 pid_t preproc = 0; 3832 3833 filename = av[ac-1]; 3834 3835 while ((c = getopt(ac, av, "cNnp:qS")) != -1) { 3836 switch(c) { 3837 case 'c': 3838 do_compact = 1; 3839 break; 3840 3841 case 'N': 3842 do_resolv = 1; 3843 break; 3844 3845 case 'n': 3846 test_only = 1; 3847 break; 3848 3849 case 'p': 3850 cmd = optarg; 3851 /* 3852 * Skip previous args and delete last one, so we 3853 * pass all but the last argument to the preprocessor 3854 * via av[optind-1] 3855 */ 3856 av += optind - 1; 3857 ac -= optind - 1; 3858 av[ac-1] = NULL; 3859 fprintf(stderr, "command is %s\n", av[0]); 3860 break; 3861 3862 case 'q': 3863 do_quiet = 1; 3864 break; 3865 3866 case 'S': 3867 show_sets = 1; 3868 break; 3869 3870 default: 3871 errx(EX_USAGE, "bad arguments, for usage" 3872 " summary ``ipfw''"); 3873 } 3874 3875 if (cmd != NULL) 3876 break; 3877 } 3878 3879 if (cmd == NULL && ac != optind + 1) { 3880 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 3881 errx(EX_USAGE, "extraneous filename arguments"); 3882 } 3883 3884 if ((f = fopen(filename, "r")) == NULL) 3885 err(EX_UNAVAILABLE, "fopen: %s", filename); 3886 3887 if (cmd != NULL) { /* pipe through preprocessor */ 3888 int pipedes[2]; 3889 3890 if (pipe(pipedes) == -1) 3891 err(EX_OSERR, "cannot create pipe"); 3892 3893 preproc = fork(); 3894 if (preproc == -1) 3895 err(EX_OSERR, "cannot fork"); 3896 3897 if (preproc == 0) { 3898 /* 3899 * Child, will run the preprocessor with the 3900 * file on stdin and the pipe on stdout. 3901 */ 3902 if (dup2(fileno(f), 0) == -1 3903 || dup2(pipedes[1], 1) == -1) 3904 err(EX_OSERR, "dup2()"); 3905 fclose(f); 3906 close(pipedes[1]); 3907 close(pipedes[0]); 3908 execvp(cmd, av); 3909 err(EX_OSERR, "execvp(%s) failed", cmd); 3910 } else { /* parent, will reopen f as the pipe */ 3911 fclose(f); 3912 close(pipedes[1]); 3913 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3914 int savederrno = errno; 3915 3916 (void)kill(preproc, SIGTERM); 3917 errno = savederrno; 3918 err(EX_OSERR, "fdopen()"); 3919 } 3920 } 3921 } 3922 3923 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 3924 char linename[10]; 3925 char *args[1]; 3926 3927 lineno++; 3928 sprintf(linename, "Line %d", lineno); 3929 setprogname(linename); /* XXX */ 3930 args[0] = buf; 3931 ipfw_main(1, args); 3932 } 3933 fclose(f); 3934 if (cmd != NULL) { 3935 int status; 3936 3937 if (waitpid(preproc, &status, 0) == -1) 3938 errx(EX_OSERR, "waitpid()"); 3939 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3940 errx(EX_UNAVAILABLE, 3941 "preprocessor exited with status %d", 3942 WEXITSTATUS(status)); 3943 else if (WIFSIGNALED(status)) 3944 errx(EX_UNAVAILABLE, 3945 "preprocessor exited with signal %d", 3946 WTERMSIG(status)); 3947 } 3948} 3949 3950int 3951main(int ac, char *av[]) 3952{ 3953 /* 3954 * If the last argument is an absolute pathname, interpret it 3955 * as a file to be preprocessed. 3956 */ 3957 3958 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3959 ipfw_readfile(ac, av); 3960 else { 3961 if (ipfw_main(ac-1, av+1)) 3962 show_usage(); 3963 } 3964 return EX_OK; 3965} 3966