ipfw2.c revision 117469
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 117469 2003-07-12 06:53:16Z luigi $ 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 <net/route.h> /* def. of struct route */ 54#include <netinet/ip_dummynet.h> 55#include <netinet/tcp.h> 56#include <arpa/inet.h> 57 58int 59 do_resolv, /* Would try to resolve all */ 60 do_time, /* Show time stamps */ 61 do_quiet, /* Be quiet in add and flush */ 62 do_force, /* Don't ask for confirmation */ 63 do_pipe, /* this cmd refers to a pipe */ 64 do_sort, /* field to sort results (0 = no) */ 65 do_dynamic, /* display dynamic rules */ 66 do_expired, /* display expired dynamic rules */ 67 do_compact, /* show rules in compact mode */ 68 show_sets, /* display rule sets */ 69 test_only, /* only check syntax */ 70 verbose; 71 72#define IP_MASK_ALL 0xffffffff 73 74/* 75 * _s_x is a structure that stores a string <-> token pairs, used in 76 * various places in the parser. Entries are stored in arrays, 77 * with an entry with s=NULL as terminator. 78 * The search routines are match_token() and match_value(). 79 * Often, an element with x=0 contains an error string. 80 * 81 */ 82struct _s_x { 83 char const *s; 84 int x; 85}; 86 87static struct _s_x f_tcpflags[] = { 88 { "syn", TH_SYN }, 89 { "fin", TH_FIN }, 90 { "ack", TH_ACK }, 91 { "psh", TH_PUSH }, 92 { "rst", TH_RST }, 93 { "urg", TH_URG }, 94 { "tcp flag", 0 }, 95 { NULL, 0 } 96}; 97 98static struct _s_x f_tcpopts[] = { 99 { "mss", IP_FW_TCPOPT_MSS }, 100 { "maxseg", IP_FW_TCPOPT_MSS }, 101 { "window", IP_FW_TCPOPT_WINDOW }, 102 { "sack", IP_FW_TCPOPT_SACK }, 103 { "ts", IP_FW_TCPOPT_TS }, 104 { "timestamp", IP_FW_TCPOPT_TS }, 105 { "cc", IP_FW_TCPOPT_CC }, 106 { "tcp option", 0 }, 107 { NULL, 0 } 108}; 109 110/* 111 * IP options span the range 0 to 255 so we need to remap them 112 * (though in fact only the low 5 bits are significant). 113 */ 114static struct _s_x f_ipopts[] = { 115 { "ssrr", IP_FW_IPOPT_SSRR}, 116 { "lsrr", IP_FW_IPOPT_LSRR}, 117 { "rr", IP_FW_IPOPT_RR}, 118 { "ts", IP_FW_IPOPT_TS}, 119 { "ip option", 0 }, 120 { NULL, 0 } 121}; 122 123static struct _s_x f_iptos[] = { 124 { "lowdelay", IPTOS_LOWDELAY}, 125 { "throughput", IPTOS_THROUGHPUT}, 126 { "reliability", IPTOS_RELIABILITY}, 127 { "mincost", IPTOS_MINCOST}, 128 { "congestion", IPTOS_CE}, 129 { "ecntransport", IPTOS_ECT}, 130 { "ip tos option", 0}, 131 { NULL, 0 } 132}; 133 134static struct _s_x limit_masks[] = { 135 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 136 {"src-addr", DYN_SRC_ADDR}, 137 {"src-port", DYN_SRC_PORT}, 138 {"dst-addr", DYN_DST_ADDR}, 139 {"dst-port", DYN_DST_PORT}, 140 {NULL, 0} 141}; 142 143/* 144 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 145 * This is only used in this code. 146 */ 147#define IPPROTO_ETHERTYPE 0x1000 148static struct _s_x ether_types[] = { 149 /* 150 * Note, we cannot use "-:&/" in the names because they are field 151 * separators in the type specifications. Also, we use s = NULL as 152 * end-delimiter, because a type of 0 can be legal. 153 */ 154 { "ip", 0x0800 }, 155 { "ipv4", 0x0800 }, 156 { "ipv6", 0x86dd }, 157 { "arp", 0x0806 }, 158 { "rarp", 0x8035 }, 159 { "vlan", 0x8100 }, 160 { "loop", 0x9000 }, 161 { "trail", 0x1000 }, 162 { "at", 0x809b }, 163 { "atalk", 0x809b }, 164 { "aarp", 0x80f3 }, 165 { "pppoe_disc", 0x8863 }, 166 { "pppoe_sess", 0x8864 }, 167 { "ipx_8022", 0x00E0 }, 168 { "ipx_8023", 0x0000 }, 169 { "ipx_ii", 0x8137 }, 170 { "ipx_snap", 0x8137 }, 171 { "ipx", 0x8137 }, 172 { "ns", 0x0600 }, 173 { NULL, 0 } 174}; 175 176static void show_usage(void); 177 178enum tokens { 179 TOK_NULL=0, 180 181 TOK_OR, 182 TOK_NOT, 183 TOK_STARTBRACE, 184 TOK_ENDBRACE, 185 186 TOK_ACCEPT, 187 TOK_COUNT, 188 TOK_PIPE, 189 TOK_QUEUE, 190 TOK_DIVERT, 191 TOK_TEE, 192 TOK_FORWARD, 193 TOK_SKIPTO, 194 TOK_DENY, 195 TOK_REJECT, 196 TOK_RESET, 197 TOK_UNREACH, 198 TOK_CHECKSTATE, 199 200 TOK_UID, 201 TOK_GID, 202 TOK_IN, 203 TOK_LIMIT, 204 TOK_KEEPSTATE, 205 TOK_LAYER2, 206 TOK_OUT, 207 TOK_XMIT, 208 TOK_RECV, 209 TOK_VIA, 210 TOK_FRAG, 211 TOK_IPOPTS, 212 TOK_IPLEN, 213 TOK_IPID, 214 TOK_IPPRECEDENCE, 215 TOK_IPTOS, 216 TOK_IPTTL, 217 TOK_IPVER, 218 TOK_ESTAB, 219 TOK_SETUP, 220 TOK_TCPFLAGS, 221 TOK_TCPOPTS, 222 TOK_TCPSEQ, 223 TOK_TCPACK, 224 TOK_TCPWIN, 225 TOK_ICMPTYPES, 226 TOK_MAC, 227 TOK_MACTYPE, 228 TOK_VERREVPATH, 229 TOK_IPSEC, 230 TOK_COMMENT, 231 232 TOK_PLR, 233 TOK_NOERROR, 234 TOK_BUCKETS, 235 TOK_DSTIP, 236 TOK_SRCIP, 237 TOK_DSTPORT, 238 TOK_SRCPORT, 239 TOK_ALL, 240 TOK_MASK, 241 TOK_BW, 242 TOK_DELAY, 243 TOK_RED, 244 TOK_GRED, 245 TOK_DROPTAIL, 246 TOK_PROTO, 247 TOK_WEIGHT, 248}; 249 250struct _s_x dummynet_params[] = { 251 { "plr", TOK_PLR }, 252 { "noerror", TOK_NOERROR }, 253 { "buckets", TOK_BUCKETS }, 254 { "dst-ip", TOK_DSTIP }, 255 { "src-ip", TOK_SRCIP }, 256 { "dst-port", TOK_DSTPORT }, 257 { "src-port", TOK_SRCPORT }, 258 { "proto", TOK_PROTO }, 259 { "weight", TOK_WEIGHT }, 260 { "all", TOK_ALL }, 261 { "mask", TOK_MASK }, 262 { "droptail", TOK_DROPTAIL }, 263 { "red", TOK_RED }, 264 { "gred", TOK_GRED }, 265 { "bw", TOK_BW }, 266 { "bandwidth", TOK_BW }, 267 { "delay", TOK_DELAY }, 268 { "pipe", TOK_PIPE }, 269 { "queue", TOK_QUEUE }, 270 { "dummynet-params", TOK_NULL }, 271 { NULL, 0 } /* terminator */ 272}; 273 274struct _s_x rule_actions[] = { 275 { "accept", TOK_ACCEPT }, 276 { "pass", TOK_ACCEPT }, 277 { "allow", TOK_ACCEPT }, 278 { "permit", TOK_ACCEPT }, 279 { "count", TOK_COUNT }, 280 { "pipe", TOK_PIPE }, 281 { "queue", TOK_QUEUE }, 282 { "divert", TOK_DIVERT }, 283 { "tee", TOK_TEE }, 284 { "fwd", TOK_FORWARD }, 285 { "forward", TOK_FORWARD }, 286 { "skipto", TOK_SKIPTO }, 287 { "deny", TOK_DENY }, 288 { "drop", TOK_DENY }, 289 { "reject", TOK_REJECT }, 290 { "reset", TOK_RESET }, 291 { "unreach", TOK_UNREACH }, 292 { "check-state", TOK_CHECKSTATE }, 293 { "//", TOK_COMMENT }, 294 { NULL, 0 } /* terminator */ 295}; 296 297struct _s_x rule_options[] = { 298 { "uid", TOK_UID }, 299 { "gid", TOK_GID }, 300 { "in", TOK_IN }, 301 { "limit", TOK_LIMIT }, 302 { "keep-state", TOK_KEEPSTATE }, 303 { "bridged", TOK_LAYER2 }, 304 { "layer2", TOK_LAYER2 }, 305 { "out", TOK_OUT }, 306 { "xmit", TOK_XMIT }, 307 { "recv", TOK_RECV }, 308 { "via", TOK_VIA }, 309 { "fragment", TOK_FRAG }, 310 { "frag", TOK_FRAG }, 311 { "ipoptions", TOK_IPOPTS }, 312 { "ipopts", TOK_IPOPTS }, 313 { "iplen", TOK_IPLEN }, 314 { "ipid", TOK_IPID }, 315 { "ipprecedence", TOK_IPPRECEDENCE }, 316 { "iptos", TOK_IPTOS }, 317 { "ipttl", TOK_IPTTL }, 318 { "ipversion", TOK_IPVER }, 319 { "ipver", TOK_IPVER }, 320 { "estab", TOK_ESTAB }, 321 { "established", TOK_ESTAB }, 322 { "setup", TOK_SETUP }, 323 { "tcpflags", TOK_TCPFLAGS }, 324 { "tcpflgs", TOK_TCPFLAGS }, 325 { "tcpoptions", TOK_TCPOPTS }, 326 { "tcpopts", TOK_TCPOPTS }, 327 { "tcpseq", TOK_TCPSEQ }, 328 { "tcpack", TOK_TCPACK }, 329 { "tcpwin", TOK_TCPWIN }, 330 { "icmptype", TOK_ICMPTYPES }, 331 { "icmptypes", TOK_ICMPTYPES }, 332 { "dst-ip", TOK_DSTIP }, 333 { "src-ip", TOK_SRCIP }, 334 { "dst-port", TOK_DSTPORT }, 335 { "src-port", TOK_SRCPORT }, 336 { "proto", TOK_PROTO }, 337 { "MAC", TOK_MAC }, 338 { "mac", TOK_MAC }, 339 { "mac-type", TOK_MACTYPE }, 340 { "verrevpath", TOK_VERREVPATH }, 341 { "ipsec", TOK_IPSEC }, 342 { "//", TOK_COMMENT }, 343 344 { "not", TOK_NOT }, /* pseudo option */ 345 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 346 { "or", TOK_OR }, /* pseudo option */ 347 { "|", /* escape */ TOK_OR }, /* pseudo option */ 348 { "{", TOK_STARTBRACE }, /* pseudo option */ 349 { "(", TOK_STARTBRACE }, /* pseudo option */ 350 { "}", TOK_ENDBRACE }, /* pseudo option */ 351 { ")", TOK_ENDBRACE }, /* pseudo option */ 352 { NULL, 0 } /* terminator */ 353}; 354 355static __inline uint64_t 356align_uint64(uint64_t *pll) { 357 uint64_t ret; 358 359 bcopy (pll, &ret, sizeof(ret)); 360 return ret; 361}; 362 363/* 364 * conditionally runs the command. 365 */ 366static int 367do_cmd(int optname, void *optval, socklen_t optlen) 368{ 369 static int s = -1; /* the socket */ 370 int i; 371 372 if (test_only) 373 return 0; 374 375 if (s == -1) 376 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 377 if (s < 0) 378 err(EX_UNAVAILABLE, "socket"); 379 380 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 381 optname == IP_FW_ADD) 382 i = getsockopt(s, IPPROTO_IP, optname, optval, 383 (socklen_t *)optlen); 384 else 385 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 386 return i; 387} 388 389/** 390 * match_token takes a table and a string, returns the value associated 391 * with the string (-1 in case of failure). 392 */ 393static int 394match_token(struct _s_x *table, char *string) 395{ 396 struct _s_x *pt; 397 uint i = strlen(string); 398 399 for (pt = table ; i && pt->s != NULL ; pt++) 400 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 401 return pt->x; 402 return -1; 403}; 404 405/** 406 * match_value takes a table and a value, returns the string associated 407 * with the value (NULL in case of failure). 408 */ 409static char const * 410match_value(struct _s_x *p, int value) 411{ 412 for (; p->s != NULL; p++) 413 if (p->x == value) 414 return p->s; 415 return NULL; 416} 417 418/* 419 * prints one port, symbolic or numeric 420 */ 421static void 422print_port(int proto, uint16_t port) 423{ 424 425 if (proto == IPPROTO_ETHERTYPE) { 426 char const *s; 427 428 if (do_resolv && (s = match_value(ether_types, port)) ) 429 printf("%s", s); 430 else 431 printf("0x%04x", port); 432 } else { 433 struct servent *se = NULL; 434 if (do_resolv) { 435 struct protoent *pe = getprotobynumber(proto); 436 437 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 438 } 439 if (se) 440 printf("%s", se->s_name); 441 else 442 printf("%d", port); 443 } 444} 445 446struct _s_x _port_name[] = { 447 {"dst-port", O_IP_DSTPORT}, 448 {"src-port", O_IP_SRCPORT}, 449 {"ipid", O_IPID}, 450 {"iplen", O_IPLEN}, 451 {"ipttl", O_IPTTL}, 452 {"mac-type", O_MAC_TYPE}, 453 {NULL, 0} 454}; 455 456/* 457 * Print the values in a list 16-bit items of the types above. 458 * XXX todo: add support for mask. 459 */ 460static void 461print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 462{ 463 uint16_t *p = cmd->ports; 464 int i; 465 char const *sep; 466 467 if (cmd->o.len & F_NOT) 468 printf(" not"); 469 if (opcode != 0) { 470 sep = match_value(_port_name, opcode); 471 if (sep == NULL) 472 sep = "???"; 473 printf (" %s", sep); 474 } 475 sep = " "; 476 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 477 printf(sep); 478 print_port(proto, p[0]); 479 if (p[0] != p[1]) { 480 printf("-"); 481 print_port(proto, p[1]); 482 } 483 sep = ","; 484 } 485} 486 487/* 488 * Like strtol, but also translates service names into port numbers 489 * for some protocols. 490 * In particular: 491 * proto == -1 disables the protocol check; 492 * proto == IPPROTO_ETHERTYPE looks up an internal table 493 * proto == <some value in /etc/protocols> matches the values there. 494 * Returns *end == s in case the parameter is not found. 495 */ 496static int 497strtoport(char *s, char **end, int base, int proto) 498{ 499 char *p, *buf; 500 char *s1; 501 int i; 502 503 *end = s; /* default - not found */ 504 if ( *s == '\0') 505 return 0; /* not found */ 506 507 if (isdigit(*s)) 508 return strtol(s, end, base); 509 510 /* 511 * find separator. '\\' escapes the next char. 512 */ 513 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 514 if (*s1 == '\\' && s1[1] != '\0') 515 s1++; 516 517 buf = malloc(s1 - s + 1); 518 if (buf == NULL) 519 return 0; 520 521 /* 522 * copy into a buffer skipping backslashes 523 */ 524 for (p = s, i = 0; p != s1 ; p++) 525 if ( *p != '\\') 526 buf[i++] = *p; 527 buf[i++] = '\0'; 528 529 if (proto == IPPROTO_ETHERTYPE) { 530 i = match_token(ether_types, buf); 531 free(buf); 532 if (i != -1) { /* found */ 533 *end = s1; 534 return i; 535 } 536 } else { 537 struct protoent *pe = NULL; 538 struct servent *se; 539 540 if (proto != 0) 541 pe = getprotobynumber(proto); 542 setservent(1); 543 se = getservbyname(buf, pe ? pe->p_name : NULL); 544 free(buf); 545 if (se != NULL) { 546 *end = s1; 547 return ntohs(se->s_port); 548 } 549 } 550 return 0; /* not found */ 551} 552 553/* 554 * Fill the body of the command with the list of port ranges. 555 */ 556static int 557fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 558{ 559 uint16_t a, b, *p = cmd->ports; 560 int i = 0; 561 char *s = av; 562 563 while (*s) { 564 a = strtoport(av, &s, 0, proto); 565 if (s == av) /* no parameter */ 566 break; 567 if (*s == '-') { /* a range */ 568 av = s+1; 569 b = strtoport(av, &s, 0, proto); 570 if (s == av) /* no parameter */ 571 break; 572 p[0] = a; 573 p[1] = b; 574 } else if (*s == ',' || *s == '\0' ) 575 p[0] = p[1] = a; 576 else /* invalid separator */ 577 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 578 *s, av); 579 i++; 580 p += 2; 581 av = s+1; 582 } 583 if (i > 0) { 584 if (i+1 > F_LEN_MASK) 585 errx(EX_DATAERR, "too many ports/ranges\n"); 586 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 587 } 588 return i; 589} 590 591static struct _s_x icmpcodes[] = { 592 { "net", ICMP_UNREACH_NET }, 593 { "host", ICMP_UNREACH_HOST }, 594 { "protocol", ICMP_UNREACH_PROTOCOL }, 595 { "port", ICMP_UNREACH_PORT }, 596 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 597 { "srcfail", ICMP_UNREACH_SRCFAIL }, 598 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 599 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 600 { "isolated", ICMP_UNREACH_ISOLATED }, 601 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 602 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 603 { "tosnet", ICMP_UNREACH_TOSNET }, 604 { "toshost", ICMP_UNREACH_TOSHOST }, 605 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 606 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 607 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 608 { NULL, 0 } 609}; 610 611static void 612fill_reject_code(u_short *codep, char *str) 613{ 614 int val; 615 char *s; 616 617 val = strtoul(str, &s, 0); 618 if (s == str || *s != '\0' || val >= 0x100) 619 val = match_token(icmpcodes, str); 620 if (val < 0) 621 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 622 *codep = val; 623 return; 624} 625 626static void 627print_reject_code(uint16_t code) 628{ 629 char const *s = match_value(icmpcodes, code); 630 631 if (s != NULL) 632 printf("unreach %s", s); 633 else 634 printf("unreach %u", code); 635} 636 637/* 638 * Returns the number of bits set (from left) in a contiguous bitmask, 639 * or -1 if the mask is not contiguous. 640 * XXX this needs a proper fix. 641 * This effectively works on masks in big-endian (network) format. 642 * when compiled on little endian architectures. 643 * 644 * First bit is bit 7 of the first byte -- note, for MAC addresses, 645 * the first bit on the wire is bit 0 of the first byte. 646 * len is the max length in bits. 647 */ 648static int 649contigmask(u_char *p, int len) 650{ 651 int i, n; 652 for (i=0; i<len ; i++) 653 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 654 break; 655 for (n=i+1; n < len; n++) 656 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 657 return -1; /* mask not contiguous */ 658 return i; 659} 660 661/* 662 * print flags set/clear in the two bitmasks passed as parameters. 663 * There is a specialized check for f_tcpflags. 664 */ 665static void 666print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 667{ 668 char const *comma = ""; 669 int i; 670 u_char set = cmd->arg1 & 0xff; 671 u_char clear = (cmd->arg1 >> 8) & 0xff; 672 673 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 674 printf(" setup"); 675 return; 676 } 677 678 printf(" %s ", name); 679 for (i=0; list[i].x != 0; i++) { 680 if (set & list[i].x) { 681 set &= ~list[i].x; 682 printf("%s%s", comma, list[i].s); 683 comma = ","; 684 } 685 if (clear & list[i].x) { 686 clear &= ~list[i].x; 687 printf("%s!%s", comma, list[i].s); 688 comma = ","; 689 } 690 } 691} 692 693/* 694 * Print the ip address contained in a command. 695 */ 696static void 697print_ip(ipfw_insn_ip *cmd, char const *s) 698{ 699 struct hostent *he = NULL; 700 int len = F_LEN((ipfw_insn *)cmd); 701 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 702 703 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 704 705 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 706 printf("me"); 707 return; 708 } 709 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 710 uint32_t x, *map = (uint32_t *)&(cmd->mask); 711 int i, j; 712 char comma = '{'; 713 714 x = cmd->o.arg1 - 1; 715 x = htonl( ~x ); 716 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 717 printf("%s/%d", inet_ntoa(cmd->addr), 718 contigmask((u_char *)&x, 32)); 719 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 720 x &= 0xff; /* base */ 721 /* 722 * Print bits and ranges. 723 * Locate first bit set (i), then locate first bit unset (j). 724 * If we have 3+ consecutive bits set, then print them as a 725 * range, otherwise only print the initial bit and rescan. 726 */ 727 for (i=0; i < cmd->o.arg1; i++) 728 if (map[i/32] & (1<<(i & 31))) { 729 for (j=i+1; j < cmd->o.arg1; j++) 730 if (!(map[ j/32] & (1<<(j & 31)))) 731 break; 732 printf("%c%d", comma, i+x); 733 if (j>i+2) { /* range has at least 3 elements */ 734 printf("-%d", j-1+x); 735 i = j-1; 736 } 737 comma = ','; 738 } 739 printf("}"); 740 return; 741 } 742 /* 743 * len == 2 indicates a single IP, whereas lists of 1 or more 744 * addr/mask pairs have len = (2n+1). We convert len to n so we 745 * use that to count the number of entries. 746 */ 747 for (len = len / 2; len > 0; len--, a += 2) { 748 int mb = /* mask length */ 749 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 750 32 : contigmask((u_char *)&(a[1]), 32); 751 if (mb == 32 && do_resolv) 752 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 753 if (he != NULL) /* resolved to name */ 754 printf("%s", he->h_name); 755 else if (mb == 0) /* any */ 756 printf("any"); 757 else { /* numeric IP followed by some kind of mask */ 758 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 759 if (mb < 0) 760 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 761 else if (mb < 32) 762 printf("/%d", mb); 763 } 764 if (len > 1) 765 printf(","); 766 } 767 768} 769 770/* 771 * prints a MAC address/mask pair 772 */ 773static void 774print_mac(u_char *addr, u_char *mask) 775{ 776 int l = contigmask(mask, 48); 777 778 if (l == 0) 779 printf(" any"); 780 else { 781 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 782 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 783 if (l == -1) 784 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 785 mask[0], mask[1], mask[2], 786 mask[3], mask[4], mask[5]); 787 else if (l < 48) 788 printf("/%d", l); 789 } 790} 791 792static void 793fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 794{ 795 uint8_t type; 796 797 cmd->d[0] = 0; 798 while (*av) { 799 if (*av == ',') 800 av++; 801 802 type = strtoul(av, &av, 0); 803 804 if (*av != ',' && *av != '\0') 805 errx(EX_DATAERR, "invalid ICMP type"); 806 807 if (type > 31) 808 errx(EX_DATAERR, "ICMP type out of range"); 809 810 cmd->d[0] |= 1 << type; 811 } 812 cmd->o.opcode = O_ICMPTYPE; 813 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 814} 815 816static void 817print_icmptypes(ipfw_insn_u32 *cmd) 818{ 819 int i; 820 char sep= ' '; 821 822 printf(" icmptypes"); 823 for (i = 0; i < 32; i++) { 824 if ( (cmd->d[0] & (1 << (i))) == 0) 825 continue; 826 printf("%c%d", sep, i); 827 sep = ','; 828 } 829} 830 831/* 832 * show_ipfw() prints the body of an ipfw rule. 833 * Because the standard rule has at least proto src_ip dst_ip, we use 834 * a helper function to produce these entries if not provided explicitly. 835 * The first argument is the list of fields we have, the second is 836 * the list of fields we want to be printed. 837 * 838 * Special cases if we have provided a MAC header: 839 * + if the rule does not contain IP addresses/ports, do not print them; 840 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 841 * 842 * Once we have 'have_options', IP header fields are printed as options. 843 */ 844#define HAVE_PROTO 0x0001 845#define HAVE_SRCIP 0x0002 846#define HAVE_DSTIP 0x0004 847#define HAVE_MAC 0x0008 848#define HAVE_MACTYPE 0x0010 849#define HAVE_OPTIONS 0x8000 850 851#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 852static void 853show_prerequisites(int *flags, int want, int cmd) 854{ 855 if ( (*flags & HAVE_IP) == HAVE_IP) 856 *flags |= HAVE_OPTIONS; 857 858 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 859 cmd != O_MAC_TYPE) { 860 /* 861 * mac-type was optimized out by the compiler, 862 * restore it 863 */ 864 printf(" any"); 865 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 866 return; 867 } 868 if ( !(*flags & HAVE_OPTIONS)) { 869 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 870 printf(" ip"); 871 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 872 printf(" from any"); 873 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 874 printf(" to any"); 875 } 876 *flags |= want; 877} 878 879static void 880show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 881{ 882 static int twidth = 0; 883 int l; 884 ipfw_insn *cmd; 885 int proto = 0; /* default */ 886 int flags = 0; /* prerequisites */ 887 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 888 int or_block = 0; /* we are in an or block */ 889 uint32_t set_disable; 890 891 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 892 893 if (set_disable & (1 << rule->set)) { /* disabled */ 894 if (!show_sets) 895 return; 896 else 897 printf("# DISABLED "); 898 } 899 printf("%05u ", rule->rulenum); 900 901 if (pcwidth>0 || bcwidth>0) 902 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 903 bcwidth, align_uint64(&rule->bcnt)); 904 905 if (do_time) { 906 char timestr[30]; 907 time_t t = (time_t)0; 908 909 if (twidth == 0) { 910 strcpy(timestr, ctime(&t)); 911 *strchr(timestr, '\n') = '\0'; 912 twidth = strlen(timestr); 913 } 914 if (rule->timestamp) { 915#if _FreeBSD_version < 500000 /* XXX check */ 916#define _long_to_time(x) (time_t)(x) 917#endif 918 t = _long_to_time(rule->timestamp); 919 920 strcpy(timestr, ctime(&t)); 921 *strchr(timestr, '\n') = '\0'; 922 printf("%s ", timestr); 923 } else { 924 printf("%*s", twidth, " "); 925 } 926 } 927 928 if (show_sets) 929 printf("set %d ", rule->set); 930 931 /* 932 * print the optional "match probability" 933 */ 934 if (rule->cmd_len > 0) { 935 cmd = rule->cmd ; 936 if (cmd->opcode == O_PROB) { 937 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 938 double d = 1.0 * p->d[0]; 939 940 d = (d / 0x7fffffff); 941 printf("prob %f ", d); 942 } 943 } 944 945 /* 946 * first print actions 947 */ 948 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 949 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 950 switch(cmd->opcode) { 951 case O_CHECK_STATE: 952 printf("check-state"); 953 flags = HAVE_IP; /* avoid printing anything else */ 954 break; 955 956 case O_ACCEPT: 957 printf("allow"); 958 break; 959 960 case O_COUNT: 961 printf("count"); 962 break; 963 964 case O_DENY: 965 printf("deny"); 966 break; 967 968 case O_REJECT: 969 if (cmd->arg1 == ICMP_REJECT_RST) 970 printf("reset"); 971 else if (cmd->arg1 == ICMP_UNREACH_HOST) 972 printf("reject"); 973 else 974 print_reject_code(cmd->arg1); 975 break; 976 977 case O_SKIPTO: 978 printf("skipto %u", cmd->arg1); 979 break; 980 981 case O_PIPE: 982 printf("pipe %u", cmd->arg1); 983 break; 984 985 case O_QUEUE: 986 printf("queue %u", cmd->arg1); 987 break; 988 989 case O_DIVERT: 990 printf("divert %u", cmd->arg1); 991 break; 992 993 case O_TEE: 994 printf("tee %u", cmd->arg1); 995 break; 996 997 case O_FORWARD_IP: 998 { 999 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1000 1001 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1002 if (s->sa.sin_port) 1003 printf(",%d", s->sa.sin_port); 1004 } 1005 break; 1006 1007 case O_LOG: /* O_LOG is printed last */ 1008 logptr = (ipfw_insn_log *)cmd; 1009 break; 1010 1011 default: 1012 printf("** unrecognized action %d len %d", 1013 cmd->opcode, cmd->len); 1014 } 1015 } 1016 if (logptr) { 1017 if (logptr->max_log > 0) 1018 printf(" log logamount %d", logptr->max_log); 1019 else 1020 printf(" log"); 1021 } 1022 1023 /* 1024 * then print the body. 1025 */ 1026 if (rule->_pad & 1) { /* empty rules before options */ 1027 if (!do_compact) 1028 printf(" ip from any to any"); 1029 flags |= HAVE_IP | HAVE_OPTIONS; 1030 } 1031 1032 for (l = rule->act_ofs, cmd = rule->cmd ; 1033 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1034 /* useful alias */ 1035 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1036 1037 show_prerequisites(&flags, 0, cmd->opcode); 1038 1039 switch(cmd->opcode) { 1040 case O_PROB: 1041 break; /* done already */ 1042 1043 case O_PROBE_STATE: 1044 break; /* no need to print anything here */ 1045 1046 case O_MACADDR2: { 1047 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1048 1049 if ((cmd->len & F_OR) && !or_block) 1050 printf(" {"); 1051 if (cmd->len & F_NOT) 1052 printf(" not"); 1053 printf(" MAC"); 1054 flags |= HAVE_MAC; 1055 print_mac( m->addr, m->mask); 1056 print_mac( m->addr + 6, m->mask + 6); 1057 } 1058 break; 1059 1060 case O_MAC_TYPE: 1061 if ((cmd->len & F_OR) && !or_block) 1062 printf(" {"); 1063 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1064 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1065 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1066 break; 1067 1068 case O_IP_SRC: 1069 case O_IP_SRC_MASK: 1070 case O_IP_SRC_ME: 1071 case O_IP_SRC_SET: 1072 show_prerequisites(&flags, HAVE_PROTO, 0); 1073 if (!(flags & HAVE_SRCIP)) 1074 printf(" from"); 1075 if ((cmd->len & F_OR) && !or_block) 1076 printf(" {"); 1077 print_ip((ipfw_insn_ip *)cmd, 1078 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1079 flags |= HAVE_SRCIP; 1080 break; 1081 1082 case O_IP_DST: 1083 case O_IP_DST_MASK: 1084 case O_IP_DST_ME: 1085 case O_IP_DST_SET: 1086 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1087 if (!(flags & HAVE_DSTIP)) 1088 printf(" to"); 1089 if ((cmd->len & F_OR) && !or_block) 1090 printf(" {"); 1091 print_ip((ipfw_insn_ip *)cmd, 1092 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1093 flags |= HAVE_DSTIP; 1094 break; 1095 1096 case O_IP_DSTPORT: 1097 show_prerequisites(&flags, HAVE_IP, 0); 1098 case O_IP_SRCPORT: 1099 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1100 if ((cmd->len & F_OR) && !or_block) 1101 printf(" {"); 1102 print_newports((ipfw_insn_u16 *)cmd, proto, 1103 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1104 break; 1105 1106 case O_PROTO: { 1107 struct protoent *pe; 1108 1109 if ((cmd->len & F_OR) && !or_block) 1110 printf(" {"); 1111 if (cmd->len & F_NOT) 1112 printf(" not"); 1113 proto = cmd->arg1; 1114 pe = getprotobynumber(cmd->arg1); 1115 if (flags & HAVE_OPTIONS) 1116 printf(" proto"); 1117 if (pe) 1118 printf(" %s", pe->p_name); 1119 else 1120 printf(" %u", cmd->arg1); 1121 } 1122 flags |= HAVE_PROTO; 1123 break; 1124 1125 default: /*options ... */ 1126 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1127 if ((cmd->len & F_OR) && !or_block) 1128 printf(" {"); 1129 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1130 printf(" not"); 1131 switch(cmd->opcode) { 1132 case O_FRAG: 1133 printf(" frag"); 1134 break; 1135 1136 case O_IN: 1137 printf(cmd->len & F_NOT ? " out" : " in"); 1138 break; 1139 1140 case O_LAYER2: 1141 printf(" layer2"); 1142 break; 1143 case O_XMIT: 1144 case O_RECV: 1145 case O_VIA: { 1146 char const *s; 1147 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1148 1149 if (cmd->opcode == O_XMIT) 1150 s = "xmit"; 1151 else if (cmd->opcode == O_RECV) 1152 s = "recv"; 1153 else /* if (cmd->opcode == O_VIA) */ 1154 s = "via"; 1155 if (cmdif->name[0] == '\0') 1156 printf(" %s %s", s, 1157 inet_ntoa(cmdif->p.ip)); 1158 else if (cmdif->p.unit == -1) 1159 printf(" %s %s*", s, cmdif->name); 1160 else 1161 printf(" %s %s%d", s, cmdif->name, 1162 cmdif->p.unit); 1163 } 1164 break; 1165 1166 case O_IPID: 1167 if (F_LEN(cmd) == 1) 1168 printf(" ipid %u", cmd->arg1 ); 1169 else 1170 print_newports((ipfw_insn_u16 *)cmd, 0, 1171 O_IPID); 1172 break; 1173 1174 case O_IPTTL: 1175 if (F_LEN(cmd) == 1) 1176 printf(" ipttl %u", cmd->arg1 ); 1177 else 1178 print_newports((ipfw_insn_u16 *)cmd, 0, 1179 O_IPTTL); 1180 break; 1181 1182 case O_IPVER: 1183 printf(" ipver %u", cmd->arg1 ); 1184 break; 1185 1186 case O_IPPRECEDENCE: 1187 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1188 break; 1189 1190 case O_IPLEN: 1191 if (F_LEN(cmd) == 1) 1192 printf(" iplen %u", cmd->arg1 ); 1193 else 1194 print_newports((ipfw_insn_u16 *)cmd, 0, 1195 O_IPLEN); 1196 break; 1197 1198 case O_IPOPT: 1199 print_flags("ipoptions", cmd, f_ipopts); 1200 break; 1201 1202 case O_IPTOS: 1203 print_flags("iptos", cmd, f_iptos); 1204 break; 1205 1206 case O_ICMPTYPE: 1207 print_icmptypes((ipfw_insn_u32 *)cmd); 1208 break; 1209 1210 case O_ESTAB: 1211 printf(" established"); 1212 break; 1213 1214 case O_TCPFLAGS: 1215 print_flags("tcpflags", cmd, f_tcpflags); 1216 break; 1217 1218 case O_TCPOPTS: 1219 print_flags("tcpoptions", cmd, f_tcpopts); 1220 break; 1221 1222 case O_TCPWIN: 1223 printf(" tcpwin %d", ntohs(cmd->arg1)); 1224 break; 1225 1226 case O_TCPACK: 1227 printf(" tcpack %d", ntohl(cmd32->d[0])); 1228 break; 1229 1230 case O_TCPSEQ: 1231 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1232 break; 1233 1234 case O_UID: 1235 { 1236 struct passwd *pwd = getpwuid(cmd32->d[0]); 1237 1238 if (pwd) 1239 printf(" uid %s", pwd->pw_name); 1240 else 1241 printf(" uid %u", cmd32->d[0]); 1242 } 1243 break; 1244 1245 case O_GID: 1246 { 1247 struct group *grp = getgrgid(cmd32->d[0]); 1248 1249 if (grp) 1250 printf(" gid %s", grp->gr_name); 1251 else 1252 printf(" gid %u", cmd32->d[0]); 1253 } 1254 break; 1255 1256 case O_VERREVPATH: 1257 printf(" verrevpath"); 1258 break; 1259 1260 case O_IPSEC: 1261 printf(" ipsec"); 1262 break; 1263 1264 case O_NOP: 1265 printf(" // %s", (char *)(cmd + 1)); 1266 break; 1267 1268 case O_KEEP_STATE: 1269 printf(" keep-state"); 1270 break; 1271 1272 case O_LIMIT: 1273 { 1274 struct _s_x *p = limit_masks; 1275 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1276 uint8_t x = c->limit_mask; 1277 char const *comma = " "; 1278 1279 printf(" limit"); 1280 for ( ; p->x != 0 ; p++) 1281 if ((x & p->x) == p->x) { 1282 x &= ~p->x; 1283 printf("%s%s", comma, p->s); 1284 comma = ","; 1285 } 1286 printf(" %d", c->conn_limit); 1287 } 1288 break; 1289 1290 default: 1291 printf(" [opcode %d len %d]", 1292 cmd->opcode, cmd->len); 1293 } 1294 } 1295 if (cmd->len & F_OR) { 1296 printf(" or"); 1297 or_block = 1; 1298 } else if (or_block) { 1299 printf(" }"); 1300 or_block = 0; 1301 } 1302 } 1303 show_prerequisites(&flags, HAVE_IP, 0); 1304 1305 printf("\n"); 1306} 1307 1308static void 1309show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1310{ 1311 struct protoent *pe; 1312 struct in_addr a; 1313 uint16_t rulenum; 1314 1315 if (!do_expired) { 1316 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1317 return; 1318 } 1319 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1320 printf("%05d", rulenum); 1321 if (pcwidth>0 || bcwidth>0) 1322 printf(" %*llu %*llu (%ds)", pcwidth, 1323 align_uint64(&d->pcnt), bcwidth, 1324 align_uint64(&d->bcnt), d->expire); 1325 switch (d->dyn_type) { 1326 case O_LIMIT_PARENT: 1327 printf(" PARENT %d", d->count); 1328 break; 1329 case O_LIMIT: 1330 printf(" LIMIT"); 1331 break; 1332 case O_KEEP_STATE: /* bidir, no mask */ 1333 printf(" STATE"); 1334 break; 1335 } 1336 1337 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1338 printf(" %s", pe->p_name); 1339 else 1340 printf(" proto %u", d->id.proto); 1341 1342 a.s_addr = htonl(d->id.src_ip); 1343 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1344 1345 a.s_addr = htonl(d->id.dst_ip); 1346 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1347 printf("\n"); 1348} 1349 1350static int 1351sort_q(const void *pa, const void *pb) 1352{ 1353 int rev = (do_sort < 0); 1354 int field = rev ? -do_sort : do_sort; 1355 long long res = 0; 1356 const struct dn_flow_queue *a = pa; 1357 const struct dn_flow_queue *b = pb; 1358 1359 switch (field) { 1360 case 1: /* pkts */ 1361 res = a->len - b->len; 1362 break; 1363 case 2: /* bytes */ 1364 res = a->len_bytes - b->len_bytes; 1365 break; 1366 1367 case 3: /* tot pkts */ 1368 res = a->tot_pkts - b->tot_pkts; 1369 break; 1370 1371 case 4: /* tot bytes */ 1372 res = a->tot_bytes - b->tot_bytes; 1373 break; 1374 } 1375 if (res < 0) 1376 res = -1; 1377 if (res > 0) 1378 res = 1; 1379 return (int)(rev ? res : -res); 1380} 1381 1382static void 1383list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1384{ 1385 int l; 1386 1387 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1388 fs->flow_mask.proto, 1389 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1390 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1391 if (fs->rq_elements == 0) 1392 return; 1393 1394 printf("BKT Prot ___Source IP/port____ " 1395 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1396 if (do_sort != 0) 1397 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1398 for (l = 0; l < fs->rq_elements; l++) { 1399 struct in_addr ina; 1400 struct protoent *pe; 1401 1402 ina.s_addr = htonl(q[l].id.src_ip); 1403 printf("%3d ", q[l].hash_slot); 1404 pe = getprotobynumber(q[l].id.proto); 1405 if (pe) 1406 printf("%-4s ", pe->p_name); 1407 else 1408 printf("%4u ", q[l].id.proto); 1409 printf("%15s/%-5d ", 1410 inet_ntoa(ina), q[l].id.src_port); 1411 ina.s_addr = htonl(q[l].id.dst_ip); 1412 printf("%15s/%-5d ", 1413 inet_ntoa(ina), q[l].id.dst_port); 1414 printf("%4qu %8qu %2u %4u %3u\n", 1415 q[l].tot_pkts, q[l].tot_bytes, 1416 q[l].len, q[l].len_bytes, q[l].drops); 1417 if (verbose) 1418 printf(" S %20qd F %20qd\n", 1419 q[l].S, q[l].F); 1420 } 1421} 1422 1423static void 1424print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1425{ 1426 int l; 1427 char qs[30]; 1428 char plr[30]; 1429 char red[90]; /* Display RED parameters */ 1430 1431 l = fs->qsize; 1432 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1433 if (l >= 8192) 1434 sprintf(qs, "%d KB", l / 1024); 1435 else 1436 sprintf(qs, "%d B", l); 1437 } else 1438 sprintf(qs, "%3d sl.", l); 1439 if (fs->plr) 1440 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1441 else 1442 plr[0] = '\0'; 1443 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1444 sprintf(red, 1445 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1446 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1447 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1448 SCALE_VAL(fs->min_th), 1449 SCALE_VAL(fs->max_th), 1450 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1451 else 1452 sprintf(red, "droptail"); 1453 1454 printf("%s %s%s %d queues (%d buckets) %s\n", 1455 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1456} 1457 1458static void 1459list_pipes(void *data, uint nbytes, int ac, char *av[]) 1460{ 1461 int rulenum; 1462 void *next = data; 1463 struct dn_pipe *p = (struct dn_pipe *) data; 1464 struct dn_flow_set *fs; 1465 struct dn_flow_queue *q; 1466 int l; 1467 1468 if (ac > 0) 1469 rulenum = strtoul(*av++, NULL, 10); 1470 else 1471 rulenum = 0; 1472 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1473 double b = p->bandwidth; 1474 char buf[30]; 1475 char prefix[80]; 1476 1477 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1478 break; /* done with pipes, now queues */ 1479 1480 /* 1481 * compute length, as pipe have variable size 1482 */ 1483 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1484 next = (char *)p + l; 1485 nbytes -= l; 1486 1487 if (rulenum != 0 && rulenum != p->pipe_nr) 1488 continue; 1489 1490 /* 1491 * Print rate (or clocking interface) 1492 */ 1493 if (p->if_name[0] != '\0') 1494 sprintf(buf, "%s", p->if_name); 1495 else if (b == 0) 1496 sprintf(buf, "unlimited"); 1497 else if (b >= 1000000) 1498 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1499 else if (b >= 1000) 1500 sprintf(buf, "%7.3f Kbit/s", b/1000); 1501 else 1502 sprintf(buf, "%7.3f bit/s ", b); 1503 1504 sprintf(prefix, "%05d: %s %4d ms ", 1505 p->pipe_nr, buf, p->delay); 1506 print_flowset_parms(&(p->fs), prefix); 1507 if (verbose) 1508 printf(" V %20qd\n", p->V >> MY_M); 1509 1510 q = (struct dn_flow_queue *)(p+1); 1511 list_queues(&(p->fs), q); 1512 } 1513 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1514 char prefix[80]; 1515 1516 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1517 break; 1518 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1519 next = (char *)fs + l; 1520 nbytes -= l; 1521 q = (struct dn_flow_queue *)(fs+1); 1522 sprintf(prefix, "q%05d: weight %d pipe %d ", 1523 fs->fs_nr, fs->weight, fs->parent_nr); 1524 print_flowset_parms(fs, prefix); 1525 list_queues(fs, q); 1526 } 1527} 1528 1529/* 1530 * This one handles all set-related commands 1531 * ipfw set { show | enable | disable } 1532 * ipfw set swap X Y 1533 * ipfw set move X to Y 1534 * ipfw set move rule X to Y 1535 */ 1536static void 1537sets_handler(int ac, char *av[]) 1538{ 1539 uint32_t set_disable, masks[2]; 1540 int i, nbytes; 1541 uint16_t rulenum; 1542 uint8_t cmd, new_set; 1543 1544 ac--; 1545 av++; 1546 1547 if (!ac) 1548 errx(EX_USAGE, "set needs command"); 1549 if (!strncmp(*av, "show", strlen(*av)) ) { 1550 void *data; 1551 char const *msg; 1552 1553 nbytes = sizeof(struct ip_fw); 1554 if ((data = calloc(1, nbytes)) == NULL) 1555 err(EX_OSERR, "calloc"); 1556 if (do_cmd(IP_FW_GET, data, (socklen_t)&nbytes) < 0) 1557 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1558 bcopy(&((struct ip_fw *)data)->next_rule, 1559 &set_disable, sizeof(set_disable)); 1560 1561 for (i = 0, msg = "disable" ; i < 31; i++) 1562 if ( (set_disable & (1<<i))) { 1563 printf("%s %d", msg, i); 1564 msg = ""; 1565 } 1566 msg = (set_disable) ? " enable" : "enable"; 1567 for (i = 0; i < 31; i++) 1568 if ( !(set_disable & (1<<i))) { 1569 printf("%s %d", msg, i); 1570 msg = ""; 1571 } 1572 printf("\n"); 1573 } else if (!strncmp(*av, "swap", strlen(*av))) { 1574 ac--; av++; 1575 if (ac != 2) 1576 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1577 rulenum = atoi(av[0]); 1578 new_set = atoi(av[1]); 1579 if (!isdigit(*(av[0])) || rulenum > 30) 1580 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1581 if (!isdigit(*(av[1])) || new_set > 30) 1582 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1583 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1584 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1585 } else if (!strncmp(*av, "move", strlen(*av))) { 1586 ac--; av++; 1587 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1588 cmd = 2; 1589 ac--; av++; 1590 } else 1591 cmd = 3; 1592 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1593 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1594 rulenum = atoi(av[0]); 1595 new_set = atoi(av[2]); 1596 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) || 1597 (cmd == 2 && rulenum == 65535) ) 1598 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1599 if (!isdigit(*(av[2])) || new_set > 30) 1600 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1601 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1602 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1603 } else if (!strncmp(*av, "disable", strlen(*av)) || 1604 !strncmp(*av, "enable", strlen(*av)) ) { 1605 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1606 1607 ac--; av++; 1608 masks[0] = masks[1] = 0; 1609 1610 while (ac) { 1611 if (isdigit(**av)) { 1612 i = atoi(*av); 1613 if (i < 0 || i > 30) 1614 errx(EX_DATAERR, 1615 "invalid set number %d\n", i); 1616 masks[which] |= (1<<i); 1617 } else if (!strncmp(*av, "disable", strlen(*av))) 1618 which = 0; 1619 else if (!strncmp(*av, "enable", strlen(*av))) 1620 which = 1; 1621 else 1622 errx(EX_DATAERR, 1623 "invalid set command %s\n", *av); 1624 av++; ac--; 1625 } 1626 if ( (masks[0] & masks[1]) != 0 ) 1627 errx(EX_DATAERR, 1628 "cannot enable and disable the same set\n"); 1629 1630 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1631 if (i) 1632 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1633 } else 1634 errx(EX_USAGE, "invalid set command %s\n", *av); 1635} 1636 1637static void 1638sysctl_handler(int ac, char *av[], int which) 1639{ 1640 ac--; 1641 av++; 1642 1643 if (*av == NULL) { 1644 warnx("missing keyword to enable/disable\n"); 1645 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1646 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1647 &which, sizeof(which)); 1648 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1649 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1650 &which, sizeof(which)); 1651 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1652 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1653 &which, sizeof(which)); 1654 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1655 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1656 &which, sizeof(which)); 1657 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1658 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1659 &which, sizeof(which)); 1660 } else { 1661 warnx("unrecognize enable/disable keyword: %s\n", *av); 1662 } 1663} 1664 1665static void 1666list(int ac, char *av[], int show_counters) 1667{ 1668 struct ip_fw *r; 1669 ipfw_dyn_rule *dynrules, *d; 1670 1671#define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1672 char *lim; 1673 void *data = NULL; 1674 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1675 int exitval = EX_OK; 1676 int lac; 1677 char **lav; 1678 u_long rnum, last; 1679 char *endptr; 1680 int seen = 0; 1681 1682 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1683 int nalloc = 1024; /* start somewhere... */ 1684 1685 if (test_only) { 1686 fprintf(stderr, "Testing only, list disabled\n"); 1687 return; 1688 } 1689 1690 ac--; 1691 av++; 1692 1693 /* get rules or pipes from kernel, resizing array as necessary */ 1694 nbytes = nalloc; 1695 1696 while (nbytes >= nalloc) { 1697 nalloc = nalloc * 2 + 200; 1698 nbytes = nalloc; 1699 if ((data = realloc(data, nbytes)) == NULL) 1700 err(EX_OSERR, "realloc"); 1701 if (do_cmd(ocmd, data, (socklen_t)&nbytes) < 0) 1702 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1703 do_pipe ? "DUMMYNET" : "FW"); 1704 } 1705 1706 if (do_pipe) { 1707 list_pipes(data, nbytes, ac, av); 1708 goto done; 1709 } 1710 1711 /* 1712 * Count static rules. They have variable size so we 1713 * need to scan the list to count them. 1714 */ 1715 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1716 r->rulenum < 65535 && (char *)r < lim; 1717 ++nstat, r = NEXT(r) ) 1718 ; /* nothing */ 1719 1720 /* 1721 * Count dynamic rules. This is easier as they have 1722 * fixed size. 1723 */ 1724 r = NEXT(r); 1725 dynrules = (ipfw_dyn_rule *)r ; 1726 n = (char *)r - (char *)data; 1727 ndyn = (nbytes - n) / sizeof *dynrules; 1728 1729 /* if showing stats, figure out column widths ahead of time */ 1730 bcwidth = pcwidth = 0; 1731 if (show_counters) { 1732 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1733 /* packet counter */ 1734 width = snprintf(NULL, 0, "%llu", 1735 align_uint64(&r->pcnt)); 1736 if (width > pcwidth) 1737 pcwidth = width; 1738 1739 /* byte counter */ 1740 width = snprintf(NULL, 0, "%llu", 1741 align_uint64(&r->bcnt)); 1742 if (width > bcwidth) 1743 bcwidth = width; 1744 } 1745 } 1746 if (do_dynamic && ndyn) { 1747 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1748 width = snprintf(NULL, 0, "%llu", 1749 align_uint64(&d->pcnt)); 1750 if (width > pcwidth) 1751 pcwidth = width; 1752 1753 width = snprintf(NULL, 0, "%llu", 1754 align_uint64(&d->bcnt)); 1755 if (width > bcwidth) 1756 bcwidth = width; 1757 } 1758 } 1759 /* if no rule numbers were specified, list all rules */ 1760 if (ac == 0) { 1761 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1762 show_ipfw(r, pcwidth, bcwidth); 1763 1764 if (do_dynamic && ndyn) { 1765 printf("## Dynamic rules (%d):\n", ndyn); 1766 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1767 show_dyn_ipfw(d, pcwidth, bcwidth); 1768 } 1769 goto done; 1770 } 1771 1772 /* display specific rules requested on command line */ 1773 1774 for (lac = ac, lav = av; lac != 0; lac--) { 1775 /* convert command line rule # */ 1776 last = rnum = strtoul(*lav++, &endptr, 10); 1777 if (*endptr == '-') 1778 last = strtoul(endptr+1, &endptr, 10); 1779 if (*endptr) { 1780 1781 exitval = EX_USAGE; 1782 warnx("invalid rule number: %s", *(lav - 1)); 1783 continue; 1784 } 1785 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1786 if (r->rulenum > last) 1787 break; 1788 if (r->rulenum >= rnum && r->rulenum <= last) { 1789 show_ipfw(r, pcwidth, bcwidth); 1790 seen = 1; 1791 } 1792 } 1793 if (!seen) { 1794 /* give precedence to other error(s) */ 1795 if (exitval == EX_OK) 1796 exitval = EX_UNAVAILABLE; 1797 warnx("rule %lu does not exist", rnum); 1798 } 1799 } 1800 1801 if (do_dynamic && ndyn) { 1802 printf("## Dynamic rules:\n"); 1803 for (lac = ac, lav = av; lac != 0; lac--) { 1804 rnum = strtoul(*lav++, &endptr, 10); 1805 if (*endptr == '-') 1806 last = strtoul(endptr+1, &endptr, 10); 1807 if (*endptr) 1808 /* already warned */ 1809 continue; 1810 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1811 uint16_t rulenum; 1812 1813 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1814 if (rulenum > rnum) 1815 break; 1816 if (r->rulenum >= rnum && r->rulenum <= last) 1817 show_dyn_ipfw(d, pcwidth, bcwidth); 1818 } 1819 } 1820 } 1821 1822 ac = 0; 1823 1824done: 1825 free(data); 1826 1827 if (exitval != EX_OK) 1828 exit(exitval); 1829#undef NEXT 1830} 1831 1832static void 1833show_usage(void) 1834{ 1835 fprintf(stderr, "usage: ipfw [options]\n" 1836"do \"ipfw -h\" or see ipfw manpage for details\n" 1837); 1838 exit(EX_USAGE); 1839} 1840 1841static void 1842help(void) 1843{ 1844 fprintf(stderr, 1845"ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1846"ipfw [-acdeftnNpqS] command:" 1847"add [num] [set N] [prob x] RULE-BODY\n" 1848"{pipe|queue} N config PIPE-BODY\n" 1849"[pipe|queue] {zero|delete|show} [N{,N}]\n" 1850"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1851"\n" 1852"RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1853"ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1854" {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1855"ADDR: [ MAC dst src ether_type ] \n" 1856" [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n" 1857"IPLIST: IPADDR[,IPADDR] | { IPADDR or ... or IPADDR }\n" 1858"IPADDR: [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n" 1859"OPTION_LIST: OPTION [,OPTION_LIST]\n" 1860"OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1861" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1862" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1863" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1864" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1865" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1866" verrevpath\n" 1867); 1868exit(0); 1869} 1870 1871 1872static int 1873lookup_host (char *host, struct in_addr *ipaddr) 1874{ 1875 struct hostent *he; 1876 1877 if (!inet_aton(host, ipaddr)) { 1878 if ((he = gethostbyname(host)) == NULL) 1879 return(-1); 1880 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1881 } 1882 return(0); 1883} 1884 1885/* 1886 * fills the addr and mask fields in the instruction as appropriate from av. 1887 * Update length as appropriate. 1888 * The following formats are allowed: 1889 * any matches any IP. Actually returns an empty instruction. 1890 * me returns O_IP_*_ME 1891 * 1.2.3.4 single IP address 1892 * 1.2.3.4:5.6.7.8 address:mask 1893 * 1.2.3.4/24 address/mask 1894 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1895 * We can have multiple comma-separated address/mask entries. 1896 */ 1897static void 1898fill_ip(ipfw_insn_ip *cmd, char *av) 1899{ 1900 int len = 0; 1901 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1902 1903 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1904 1905 if (!strncmp(av, "any", strlen(av))) 1906 return; 1907 1908 if (!strncmp(av, "me", strlen(av))) { 1909 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1910 return; 1911 } 1912 1913 while (av) { 1914 /* 1915 * After the address we can have '/' or ':' indicating a mask, 1916 * ',' indicating another address follows, '{' indicating a 1917 * set of addresses of unspecified size. 1918 */ 1919 char *p = strpbrk(av, "/:,{"); 1920 int masklen; 1921 char md; 1922 1923 if (p) { 1924 md = *p; 1925 *p++ = '\0'; 1926 } else 1927 md = '\0'; 1928 1929 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1930 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1931 switch (md) { 1932 case ':': 1933 if (!inet_aton(p, (struct in_addr *)&d[1])) 1934 errx(EX_DATAERR, "bad netmask ``%s''", p); 1935 break; 1936 case '/': 1937 masklen = atoi(p); 1938 if (masklen == 0) 1939 d[1] = htonl(0); /* mask */ 1940 else if (masklen > 32) 1941 errx(EX_DATAERR, "bad width ``%s''", p); 1942 else 1943 d[1] = htonl(~0 << (32 - masklen)); 1944 break; 1945 case '{': /* no mask, assume /24 and put back the '{' */ 1946 d[1] = htonl(~0 << (32 - 24)); 1947 *(--p) = md; 1948 break; 1949 1950 case ',': /* single address plus continuation */ 1951 *(--p) = md; 1952 /* FALLTHROUGH */ 1953 case 0: /* initialization value */ 1954 default: 1955 d[1] = htonl(~0); /* force /32 */ 1956 break; 1957 } 1958 d[0] &= d[1]; /* mask base address with mask */ 1959 /* find next separator */ 1960 if (p) 1961 p = strpbrk(p, ",{"); 1962 if (p && *p == '{') { 1963 /* 1964 * We have a set of addresses. They are stored as follows: 1965 * arg1 is the set size (powers of 2, 2..256) 1966 * addr is the base address IN HOST FORMAT 1967 * mask.. is an array of arg1 bits (rounded up to 1968 * the next multiple of 32) with bits set 1969 * for each host in the map. 1970 */ 1971 uint32_t *map = (uint32_t *)&cmd->mask; 1972 int low, high; 1973 int i = contigmask((u_char *)&(d[1]), 32); 1974 1975 if (len > 0) 1976 errx(EX_DATAERR, "address set cannot be in a list"); 1977 if (i < 24 || i > 31) 1978 errx(EX_DATAERR, "invalid set with mask %d\n", i); 1979 cmd->o.arg1 = 1<<(32-i); /* map length */ 1980 d[0] = ntohl(d[0]); /* base addr in host format */ 1981 cmd->o.opcode = O_IP_DST_SET; /* default */ 1982 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 1983 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 1984 map[i] = 0; /* clear map */ 1985 1986 av = p + 1; 1987 low = d[0] & 0xff; 1988 high = low + cmd->o.arg1 - 1; 1989 /* 1990 * Here, i stores the previous value when we specify a range 1991 * of addresses within a mask, e.g. 45-63. i = -1 means we 1992 * have no previous value. 1993 */ 1994 i = -1; /* previous value in a range */ 1995 while (isdigit(*av)) { 1996 char *s; 1997 int a = strtol(av, &s, 0); 1998 1999 if (s == av) { /* no parameter */ 2000 if (*av != '}') 2001 errx(EX_DATAERR, "set not closed\n"); 2002 if (i != -1) 2003 errx(EX_DATAERR, "incomplete range %d-", i); 2004 break; 2005 } 2006 if (a < low || a > high) 2007 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2008 a, low, high); 2009 a -= low; 2010 if (i == -1) /* no previous in range */ 2011 i = a; 2012 else { /* check that range is valid */ 2013 if (i > a) 2014 errx(EX_DATAERR, "invalid range %d-%d", 2015 i+low, a+low); 2016 if (*s == '-') 2017 errx(EX_DATAERR, "double '-' in range"); 2018 } 2019 for (; i <= a; i++) 2020 map[i/32] |= 1<<(i & 31); 2021 i = -1; 2022 if (*s == '-') 2023 i = a; 2024 else if (*s == '}') 2025 break; 2026 av = s+1; 2027 } 2028 return; 2029 } 2030 av = p; 2031 if (av) /* then *av must be a ',' */ 2032 av++; 2033 2034 /* Check this entry */ 2035 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2036 /* 2037 * 'any' turns the entire list into a NOP. 2038 * 'not any' never matches, so it is removed from the 2039 * list unless it is the only item, in which case we 2040 * report an error. 2041 */ 2042 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2043 if (av == NULL && len == 0) /* only this entry */ 2044 errx(EX_DATAERR, "not any never matches"); 2045 } 2046 /* else do nothing and skip this entry */ 2047 continue; 2048 } 2049 /* A single IP can be stored in an optimized format */ 2050 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2051 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2052 return; 2053 } 2054 len += 2; /* two words... */ 2055 d += 2; 2056 } /* end while */ 2057 cmd->o.len |= len+1; 2058} 2059 2060 2061/* 2062 * helper function to process a set of flags and set bits in the 2063 * appropriate masks. 2064 */ 2065static void 2066fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2067 struct _s_x *flags, char *p) 2068{ 2069 uint8_t set=0, clear=0; 2070 2071 while (p && *p) { 2072 char *q; /* points to the separator */ 2073 int val; 2074 uint8_t *which; /* mask we are working on */ 2075 2076 if (*p == '!') { 2077 p++; 2078 which = &clear; 2079 } else 2080 which = &set; 2081 q = strchr(p, ','); 2082 if (q) 2083 *q++ = '\0'; 2084 val = match_token(flags, p); 2085 if (val <= 0) 2086 errx(EX_DATAERR, "invalid flag %s", p); 2087 *which |= (uint8_t)val; 2088 p = q; 2089 } 2090 cmd->opcode = opcode; 2091 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2092 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2093} 2094 2095 2096static void 2097delete(int ac, char *av[]) 2098{ 2099 uint32_t rulenum; 2100 struct dn_pipe p; 2101 int i; 2102 int exitval = EX_OK; 2103 int do_set = 0; 2104 2105 memset(&p, 0, sizeof p); 2106 2107 av++; ac--; 2108 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2109 do_set = 1; /* delete set */ 2110 ac--; av++; 2111 } 2112 2113 /* Rule number */ 2114 while (ac && isdigit(**av)) { 2115 i = atoi(*av); av++; ac--; 2116 if (do_pipe) { 2117 if (do_pipe == 1) 2118 p.pipe_nr = i; 2119 else 2120 p.fs.fs_nr = i; 2121 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2122 if (i) { 2123 exitval = 1; 2124 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2125 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2126 } 2127 } else { 2128 rulenum = (i & 0xffff) | (do_set << 24); 2129 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2130 if (i) { 2131 exitval = EX_UNAVAILABLE; 2132 warn("rule %u: setsockopt(IP_FW_DEL)", 2133 rulenum); 2134 } 2135 } 2136 } 2137 if (exitval != EX_OK) 2138 exit(exitval); 2139} 2140 2141 2142/* 2143 * fill the interface structure. We do not check the name as we can 2144 * create interfaces dynamically, so checking them at insert time 2145 * makes relatively little sense. 2146 * A '*' following the name means any unit. 2147 */ 2148static void 2149fill_iface(ipfw_insn_if *cmd, char *arg) 2150{ 2151 cmd->name[0] = '\0'; 2152 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2153 2154 /* Parse the interface or address */ 2155 if (!strcmp(arg, "any")) 2156 cmd->o.len = 0; /* effectively ignore this command */ 2157 else if (!isdigit(*arg)) { 2158 char *q; 2159 2160 strncpy(cmd->name, arg, sizeof(cmd->name)); 2161 cmd->name[sizeof(cmd->name) - 1] = '\0'; 2162 /* find first digit or wildcard */ 2163 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++) 2164 continue; 2165 cmd->p.unit = (*q == '*') ? -1 : atoi(q); 2166 *q = '\0'; 2167 } else if (!inet_aton(arg, &cmd->p.ip)) 2168 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2169} 2170 2171/* 2172 * the following macro returns an error message if we run out of 2173 * arguments. 2174 */ 2175#define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 2176 2177static void 2178config_pipe(int ac, char **av) 2179{ 2180 struct dn_pipe p; 2181 int i; 2182 char *end; 2183 uint32_t a; 2184 void *par = NULL; 2185 2186 memset(&p, 0, sizeof p); 2187 2188 av++; ac--; 2189 /* Pipe number */ 2190 if (ac && isdigit(**av)) { 2191 i = atoi(*av); av++; ac--; 2192 if (do_pipe == 1) 2193 p.pipe_nr = i; 2194 else 2195 p.fs.fs_nr = i; 2196 } 2197 while (ac > 0) { 2198 double d; 2199 int tok = match_token(dummynet_params, *av); 2200 ac--; av++; 2201 2202 switch(tok) { 2203 case TOK_NOERROR: 2204 p.fs.flags_fs |= DN_NOERROR; 2205 break; 2206 2207 case TOK_PLR: 2208 NEED1("plr needs argument 0..1\n"); 2209 d = strtod(av[0], NULL); 2210 if (d > 1) 2211 d = 1; 2212 else if (d < 0) 2213 d = 0; 2214 p.fs.plr = (int)(d*0x7fffffff); 2215 ac--; av++; 2216 break; 2217 2218 case TOK_QUEUE: 2219 NEED1("queue needs queue size\n"); 2220 end = NULL; 2221 p.fs.qsize = strtoul(av[0], &end, 0); 2222 if (*end == 'K' || *end == 'k') { 2223 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2224 p.fs.qsize *= 1024; 2225 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2226 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2227 } 2228 ac--; av++; 2229 break; 2230 2231 case TOK_BUCKETS: 2232 NEED1("buckets needs argument\n"); 2233 p.fs.rq_size = strtoul(av[0], NULL, 0); 2234 ac--; av++; 2235 break; 2236 2237 case TOK_MASK: 2238 NEED1("mask needs mask specifier\n"); 2239 /* 2240 * per-flow queue, mask is dst_ip, dst_port, 2241 * src_ip, src_port, proto measured in bits 2242 */ 2243 par = NULL; 2244 2245 p.fs.flow_mask.dst_ip = 0; 2246 p.fs.flow_mask.src_ip = 0; 2247 p.fs.flow_mask.dst_port = 0; 2248 p.fs.flow_mask.src_port = 0; 2249 p.fs.flow_mask.proto = 0; 2250 end = NULL; 2251 2252 while (ac >= 1) { 2253 uint32_t *p32 = NULL; 2254 uint16_t *p16 = NULL; 2255 2256 tok = match_token(dummynet_params, *av); 2257 ac--; av++; 2258 switch(tok) { 2259 case TOK_ALL: 2260 /* 2261 * special case, all bits significant 2262 */ 2263 p.fs.flow_mask.dst_ip = ~0; 2264 p.fs.flow_mask.src_ip = ~0; 2265 p.fs.flow_mask.dst_port = ~0; 2266 p.fs.flow_mask.src_port = ~0; 2267 p.fs.flow_mask.proto = ~0; 2268 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2269 goto end_mask; 2270 2271 case TOK_DSTIP: 2272 p32 = &p.fs.flow_mask.dst_ip; 2273 break; 2274 2275 case TOK_SRCIP: 2276 p32 = &p.fs.flow_mask.src_ip; 2277 break; 2278 2279 case TOK_DSTPORT: 2280 p16 = &p.fs.flow_mask.dst_port; 2281 break; 2282 2283 case TOK_SRCPORT: 2284 p16 = &p.fs.flow_mask.src_port; 2285 break; 2286 2287 case TOK_PROTO: 2288 break; 2289 2290 default: 2291 ac++; av--; /* backtrack */ 2292 goto end_mask; 2293 } 2294 if (ac < 1) 2295 errx(EX_USAGE, "mask: value missing"); 2296 if (*av[0] == '/') { 2297 a = strtoul(av[0]+1, &end, 0); 2298 a = (a == 32) ? ~0 : (1 << a) - 1; 2299 } else 2300 a = strtoul(av[0], &end, 0); 2301 if (p32 != NULL) 2302 *p32 = a; 2303 else if (p16 != NULL) { 2304 if (a > 65535) 2305 errx(EX_DATAERR, 2306 "mask: must be 16 bit"); 2307 *p16 = (uint16_t)a; 2308 } else { 2309 if (a > 255) 2310 errx(EX_DATAERR, 2311 "mask: must be 8 bit"); 2312 p.fs.flow_mask.proto = (uint8_t)a; 2313 } 2314 if (a != 0) 2315 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2316 ac--; av++; 2317 } /* end while, config masks */ 2318end_mask: 2319 break; 2320 2321 case TOK_RED: 2322 case TOK_GRED: 2323 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2324 p.fs.flags_fs |= DN_IS_RED; 2325 if (tok == TOK_GRED) 2326 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2327 /* 2328 * the format for parameters is w_q/min_th/max_th/max_p 2329 */ 2330 if ((end = strsep(&av[0], "/"))) { 2331 double w_q = strtod(end, NULL); 2332 if (w_q > 1 || w_q <= 0) 2333 errx(EX_DATAERR, "0 < w_q <= 1"); 2334 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2335 } 2336 if ((end = strsep(&av[0], "/"))) { 2337 p.fs.min_th = strtoul(end, &end, 0); 2338 if (*end == 'K' || *end == 'k') 2339 p.fs.min_th *= 1024; 2340 } 2341 if ((end = strsep(&av[0], "/"))) { 2342 p.fs.max_th = strtoul(end, &end, 0); 2343 if (*end == 'K' || *end == 'k') 2344 p.fs.max_th *= 1024; 2345 } 2346 if ((end = strsep(&av[0], "/"))) { 2347 double max_p = strtod(end, NULL); 2348 if (max_p > 1 || max_p <= 0) 2349 errx(EX_DATAERR, "0 < max_p <= 1"); 2350 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2351 } 2352 ac--; av++; 2353 break; 2354 2355 case TOK_DROPTAIL: 2356 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2357 break; 2358 2359 case TOK_BW: 2360 NEED1("bw needs bandwidth or interface\n"); 2361 if (do_pipe != 1) 2362 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2363 /* 2364 * set clocking interface or bandwidth value 2365 */ 2366 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2367 int l = sizeof(p.if_name)-1; 2368 /* interface name */ 2369 strncpy(p.if_name, av[0], l); 2370 p.if_name[l] = '\0'; 2371 p.bandwidth = 0; 2372 } else { 2373 p.if_name[0] = '\0'; 2374 p.bandwidth = strtoul(av[0], &end, 0); 2375 if (*end == 'K' || *end == 'k') { 2376 end++; 2377 p.bandwidth *= 1000; 2378 } else if (*end == 'M') { 2379 end++; 2380 p.bandwidth *= 1000000; 2381 } 2382 if (*end == 'B' || !strncmp(end, "by", 2)) 2383 p.bandwidth *= 8; 2384 if (p.bandwidth < 0) 2385 errx(EX_DATAERR, "bandwidth too large"); 2386 } 2387 ac--; av++; 2388 break; 2389 2390 case TOK_DELAY: 2391 if (do_pipe != 1) 2392 errx(EX_DATAERR, "delay only valid for pipes"); 2393 NEED1("delay needs argument 0..10000ms\n"); 2394 p.delay = strtoul(av[0], NULL, 0); 2395 ac--; av++; 2396 break; 2397 2398 case TOK_WEIGHT: 2399 if (do_pipe == 1) 2400 errx(EX_DATAERR,"weight only valid for queues"); 2401 NEED1("weight needs argument 0..100\n"); 2402 p.fs.weight = strtoul(av[0], &end, 0); 2403 ac--; av++; 2404 break; 2405 2406 case TOK_PIPE: 2407 if (do_pipe == 1) 2408 errx(EX_DATAERR,"pipe only valid for queues"); 2409 NEED1("pipe needs pipe_number\n"); 2410 p.fs.parent_nr = strtoul(av[0], &end, 0); 2411 ac--; av++; 2412 break; 2413 2414 default: 2415 errx(EX_DATAERR, "unrecognised option ``%s''", *av); 2416 } 2417 } 2418 if (do_pipe == 1) { 2419 if (p.pipe_nr == 0) 2420 errx(EX_DATAERR, "pipe_nr must be > 0"); 2421 if (p.delay > 10000) 2422 errx(EX_DATAERR, "delay must be < 10000"); 2423 } else { /* do_pipe == 2, queue */ 2424 if (p.fs.parent_nr == 0) 2425 errx(EX_DATAERR, "pipe must be > 0"); 2426 if (p.fs.weight >100) 2427 errx(EX_DATAERR, "weight must be <= 100"); 2428 } 2429 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2430 if (p.fs.qsize > 1024*1024) 2431 errx(EX_DATAERR, "queue size must be < 1MB"); 2432 } else { 2433 if (p.fs.qsize > 100) 2434 errx(EX_DATAERR, "2 <= queue size <= 100"); 2435 } 2436 if (p.fs.flags_fs & DN_IS_RED) { 2437 size_t len; 2438 int lookup_depth, avg_pkt_size; 2439 double s, idle, weight, w_q; 2440 struct clockinfo ck; 2441 int t; 2442 2443 if (p.fs.min_th >= p.fs.max_th) 2444 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2445 p.fs.min_th, p.fs.max_th); 2446 if (p.fs.max_th == 0) 2447 errx(EX_DATAERR, "max_th must be > 0"); 2448 2449 len = sizeof(int); 2450 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2451 &lookup_depth, &len, NULL, 0) == -1) 2452 2453 errx(1, "sysctlbyname(\"%s\")", 2454 "net.inet.ip.dummynet.red_lookup_depth"); 2455 if (lookup_depth == 0) 2456 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2457 " must be greater than zero"); 2458 2459 len = sizeof(int); 2460 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2461 &avg_pkt_size, &len, NULL, 0) == -1) 2462 2463 errx(1, "sysctlbyname(\"%s\")", 2464 "net.inet.ip.dummynet.red_avg_pkt_size"); 2465 if (avg_pkt_size == 0) 2466 errx(EX_DATAERR, 2467 "net.inet.ip.dummynet.red_avg_pkt_size must" 2468 " be greater than zero"); 2469 2470 len = sizeof(struct clockinfo); 2471 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2472 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2473 2474 /* 2475 * Ticks needed for sending a medium-sized packet. 2476 * Unfortunately, when we are configuring a WF2Q+ queue, we 2477 * do not have bandwidth information, because that is stored 2478 * in the parent pipe, and also we have multiple queues 2479 * competing for it. So we set s=0, which is not very 2480 * correct. But on the other hand, why do we want RED with 2481 * WF2Q+ ? 2482 */ 2483 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2484 s = 0; 2485 else 2486 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2487 2488 /* 2489 * max idle time (in ticks) before avg queue size becomes 0. 2490 * NOTA: (3/w_q) is approx the value x so that 2491 * (1-w_q)^x < 10^-3. 2492 */ 2493 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2494 idle = s * 3. / w_q; 2495 p.fs.lookup_step = (int)idle / lookup_depth; 2496 if (!p.fs.lookup_step) 2497 p.fs.lookup_step = 1; 2498 weight = 1 - w_q; 2499 for (t = p.fs.lookup_step; t > 0; --t) 2500 weight *= weight; 2501 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2502 } 2503 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2504 if (i) 2505 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2506} 2507 2508static void 2509get_mac_addr_mask(char *p, u_char *addr, u_char *mask) 2510{ 2511 int i, l; 2512 2513 for (i=0; i<6; i++) 2514 addr[i] = mask[i] = 0; 2515 if (!strcmp(p, "any")) 2516 return; 2517 2518 for (i=0; *p && i<6;i++, p++) { 2519 addr[i] = strtol(p, &p, 16); 2520 if (*p != ':') /* we start with the mask */ 2521 break; 2522 } 2523 if (*p == '/') { /* mask len */ 2524 l = strtol(p+1, &p, 0); 2525 for (i=0; l>0; l -=8, i++) 2526 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2527 } else if (*p == '&') { /* mask */ 2528 for (i=0, p++; *p && i<6;i++, p++) { 2529 mask[i] = strtol(p, &p, 16); 2530 if (*p != ':') 2531 break; 2532 } 2533 } else if (*p == '\0') { 2534 for (i=0; i<6; i++) 2535 mask[i] = 0xff; 2536 } 2537 for (i=0; i<6; i++) 2538 addr[i] &= mask[i]; 2539} 2540 2541/* 2542 * helper function, updates the pointer to cmd with the length 2543 * of the current command, and also cleans up the first word of 2544 * the new command in case it has been clobbered before. 2545 */ 2546static ipfw_insn * 2547next_cmd(ipfw_insn *cmd) 2548{ 2549 cmd += F_LEN(cmd); 2550 bzero(cmd, sizeof(*cmd)); 2551 return cmd; 2552} 2553 2554/* 2555 * Takes arguments and copies them into a comment 2556 */ 2557static void 2558fill_comment(ipfw_insn *cmd, int ac, char **av) 2559{ 2560 int i, l; 2561 char *p = (char *)(cmd + 1); 2562 2563 cmd->opcode = O_NOP; 2564 cmd->len = (cmd->len & (F_NOT | F_OR)); 2565 2566 /* Compute length of comment string. */ 2567 for (i = 0, l = 0; i < ac; i++) 2568 l += strlen(av[i]) + 1; 2569 if (l == 0) 2570 return; 2571 if (l > 84) 2572 errx(EX_DATAERR, 2573 "comment too long (max 80 chars)"); 2574 l = 1 + (l+3)/4; 2575 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2576 for (i = 0; i < ac; i++) { 2577 strcpy(p, av[i]); 2578 p += strlen(av[i]); 2579 *p++ = ' '; 2580 } 2581 *(--p) = '\0'; 2582} 2583 2584/* 2585 * A function to fill simple commands of size 1. 2586 * Existing flags are preserved. 2587 */ 2588static void 2589fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2590{ 2591 cmd->opcode = opcode; 2592 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2593 cmd->arg1 = arg; 2594} 2595 2596/* 2597 * Fetch and add the MAC address and type, with masks. This generates one or 2598 * two microinstructions, and returns the pointer to the last one. 2599 */ 2600static ipfw_insn * 2601add_mac(ipfw_insn *cmd, int ac, char *av[]) 2602{ 2603 ipfw_insn_mac *mac; 2604 2605 if (ac < 2) 2606 errx(EX_DATAERR, "MAC dst src"); 2607 2608 cmd->opcode = O_MACADDR2; 2609 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2610 2611 mac = (ipfw_insn_mac *)cmd; 2612 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2613 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2614 return cmd; 2615} 2616 2617static ipfw_insn * 2618add_mactype(ipfw_insn *cmd, int ac, char *av) 2619{ 2620 if (ac < 1) 2621 errx(EX_DATAERR, "missing MAC type"); 2622 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2623 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2624 cmd->opcode = O_MAC_TYPE; 2625 return cmd; 2626 } else 2627 return NULL; 2628} 2629 2630static ipfw_insn * 2631add_proto(ipfw_insn *cmd, char *av) 2632{ 2633 struct protoent *pe; 2634 u_char proto = 0; 2635 2636 if (!strncmp(av, "all", strlen(av))) 2637 ; /* same as "ip" */ 2638 else if ((proto = atoi(av)) > 0) 2639 ; /* all done! */ 2640 else if ((pe = getprotobyname(av)) != NULL) 2641 proto = pe->p_proto; 2642 else 2643 return NULL; 2644 if (proto != IPPROTO_IP) 2645 fill_cmd(cmd, O_PROTO, 0, proto); 2646 return cmd; 2647} 2648 2649static ipfw_insn * 2650add_srcip(ipfw_insn *cmd, char *av) 2651{ 2652 fill_ip((ipfw_insn_ip *)cmd, av); 2653 if (cmd->opcode == O_IP_DST_SET) /* set */ 2654 cmd->opcode = O_IP_SRC_SET; 2655 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2656 cmd->opcode = O_IP_SRC_ME; 2657 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2658 cmd->opcode = O_IP_SRC; 2659 else /* addr/mask */ 2660 cmd->opcode = O_IP_SRC_MASK; 2661 return cmd; 2662} 2663 2664static ipfw_insn * 2665add_dstip(ipfw_insn *cmd, char *av) 2666{ 2667 fill_ip((ipfw_insn_ip *)cmd, av); 2668 if (cmd->opcode == O_IP_DST_SET) /* set */ 2669 ; 2670 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2671 cmd->opcode = O_IP_DST_ME; 2672 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2673 cmd->opcode = O_IP_DST; 2674 else /* addr/mask */ 2675 cmd->opcode = O_IP_DST_MASK; 2676 return cmd; 2677} 2678 2679static ipfw_insn * 2680add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2681{ 2682 if (!strncmp(av, "any", strlen(av))) { 2683 return NULL; 2684 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2685 /* XXX todo: check that we have a protocol with ports */ 2686 cmd->opcode = opcode; 2687 return cmd; 2688 } 2689 return NULL; 2690} 2691 2692/* 2693 * Parse arguments and assemble the microinstructions which make up a rule. 2694 * Rules are added into the 'rulebuf' and then copied in the correct order 2695 * into the actual rule. 2696 * 2697 * The syntax for a rule starts with the action, followed by an 2698 * optional log action, and the various match patterns. 2699 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2700 * (generated if the rule includes a keep-state option), then the 2701 * various match patterns, the "log" action, and the actual action. 2702 * 2703 */ 2704static void 2705add(int ac, char *av[]) 2706{ 2707 /* 2708 * rules are added into the 'rulebuf' and then copied in 2709 * the correct order into the actual rule. 2710 * Some things that need to go out of order (prob, action etc.) 2711 * go into actbuf[]. 2712 */ 2713 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2714 2715 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2716 ipfw_insn *first_cmd; /* first match pattern */ 2717 2718 struct ip_fw *rule; 2719 2720 /* 2721 * various flags used to record that we entered some fields. 2722 */ 2723 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2724 2725 int i; 2726 2727 int open_par = 0; /* open parenthesis ( */ 2728 2729 /* proto is here because it is used to fetch ports */ 2730 u_char proto = IPPROTO_IP; /* default protocol */ 2731 2732 double match_prob = 1; /* match probability, default is always match */ 2733 2734 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2735 bzero(cmdbuf, sizeof(cmdbuf)); 2736 bzero(rulebuf, sizeof(rulebuf)); 2737 2738 rule = (struct ip_fw *)rulebuf; 2739 cmd = (ipfw_insn *)cmdbuf; 2740 action = (ipfw_insn *)actbuf; 2741 2742 av++; ac--; 2743 2744 /* [rule N] -- Rule number optional */ 2745 if (ac && isdigit(**av)) { 2746 rule->rulenum = atoi(*av); 2747 av++; 2748 ac--; 2749 } 2750 2751 /* [set N] -- set number (0..30), optional */ 2752 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2753 int set = strtoul(av[1], NULL, 10); 2754 if (set < 0 || set > 30) 2755 errx(EX_DATAERR, "illegal set %s", av[1]); 2756 rule->set = set; 2757 av += 2; ac -= 2; 2758 } 2759 2760 /* [prob D] -- match probability, optional */ 2761 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2762 match_prob = strtod(av[1], NULL); 2763 2764 if (match_prob <= 0 || match_prob > 1) 2765 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2766 av += 2; ac -= 2; 2767 } 2768 2769 /* action -- mandatory */ 2770 NEED1("missing action"); 2771 i = match_token(rule_actions, *av); 2772 ac--; av++; 2773 action->len = 1; /* default */ 2774 switch(i) { 2775 case TOK_CHECKSTATE: 2776 have_state = action; 2777 action->opcode = O_CHECK_STATE; 2778 break; 2779 2780 case TOK_ACCEPT: 2781 action->opcode = O_ACCEPT; 2782 break; 2783 2784 case TOK_DENY: 2785 action->opcode = O_DENY; 2786 action->arg1 = 0; 2787 break; 2788 2789 case TOK_REJECT: 2790 action->opcode = O_REJECT; 2791 action->arg1 = ICMP_UNREACH_HOST; 2792 break; 2793 2794 case TOK_RESET: 2795 action->opcode = O_REJECT; 2796 action->arg1 = ICMP_REJECT_RST; 2797 break; 2798 2799 case TOK_UNREACH: 2800 action->opcode = O_REJECT; 2801 NEED1("missing reject code"); 2802 fill_reject_code(&action->arg1, *av); 2803 ac--; av++; 2804 break; 2805 2806 case TOK_COUNT: 2807 action->opcode = O_COUNT; 2808 break; 2809 2810 case TOK_QUEUE: 2811 case TOK_PIPE: 2812 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2813 case TOK_SKIPTO: 2814 if (i == TOK_QUEUE) 2815 action->opcode = O_QUEUE; 2816 else if (i == TOK_PIPE) 2817 action->opcode = O_PIPE; 2818 else if (i == TOK_SKIPTO) 2819 action->opcode = O_SKIPTO; 2820 NEED1("missing skipto/pipe/queue number"); 2821 action->arg1 = strtoul(*av, NULL, 10); 2822 av++; ac--; 2823 break; 2824 2825 case TOK_DIVERT: 2826 case TOK_TEE: 2827 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2828 NEED1("missing divert/tee port"); 2829 action->arg1 = strtoul(*av, NULL, 0); 2830 if (action->arg1 == 0) { 2831 struct servent *s; 2832 setservent(1); 2833 s = getservbyname(av[0], "divert"); 2834 if (s != NULL) 2835 action->arg1 = ntohs(s->s_port); 2836 else 2837 errx(EX_DATAERR, "illegal divert/tee port"); 2838 } 2839 ac--; av++; 2840 break; 2841 2842 case TOK_FORWARD: { 2843 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2844 char *s, *end; 2845 2846 NEED1("missing forward address[:port]"); 2847 2848 action->opcode = O_FORWARD_IP; 2849 action->len = F_INSN_SIZE(ipfw_insn_sa); 2850 2851 p->sa.sin_len = sizeof(struct sockaddr_in); 2852 p->sa.sin_family = AF_INET; 2853 p->sa.sin_port = 0; 2854 /* 2855 * locate the address-port separator (':' or ',') 2856 */ 2857 s = strchr(*av, ':'); 2858 if (s == NULL) 2859 s = strchr(*av, ','); 2860 if (s != NULL) { 2861 *(s++) = '\0'; 2862 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2863 if (s == end) 2864 errx(EX_DATAERR, 2865 "illegal forwarding port ``%s''", s); 2866 p->sa.sin_port = (u_short)i; 2867 } 2868 lookup_host(*av, &(p->sa.sin_addr)); 2869 } 2870 ac--; av++; 2871 break; 2872 2873 case TOK_COMMENT: 2874 /* pretend it is a 'count' rule followed by the comment */ 2875 action->opcode = O_COUNT; 2876 ac++; av--; /* go back... */ 2877 break; 2878 2879 default: 2880 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2881 } 2882 action = next_cmd(action); 2883 2884 /* 2885 * [log [logamount N]] -- log, optional 2886 * 2887 * If exists, it goes first in the cmdbuf, but then it is 2888 * skipped in the copy section to the end of the buffer. 2889 */ 2890 if (ac && !strncmp(*av, "log", strlen(*av))) { 2891 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2892 int l; 2893 2894 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2895 cmd->opcode = O_LOG; 2896 av++; ac--; 2897 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2898 ac--; av++; 2899 NEED1("logamount requires argument"); 2900 l = atoi(*av); 2901 if (l < 0) 2902 errx(EX_DATAERR, "logamount must be positive"); 2903 c->max_log = l; 2904 ac--; av++; 2905 } 2906 cmd = next_cmd(cmd); 2907 } 2908 2909 if (have_state) /* must be a check-state, we are done */ 2910 goto done; 2911 2912#define OR_START(target) \ 2913 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2914 if (open_par) \ 2915 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2916 prev = NULL; \ 2917 open_par = 1; \ 2918 if ( (av[0])[1] == '\0') { \ 2919 ac--; av++; \ 2920 } else \ 2921 (*av)++; \ 2922 } \ 2923 target: \ 2924 2925 2926#define CLOSE_PAR \ 2927 if (open_par) { \ 2928 if (ac && ( \ 2929 !strncmp(*av, ")", strlen(*av)) || \ 2930 !strncmp(*av, "}", strlen(*av)) )) { \ 2931 prev = NULL; \ 2932 open_par = 0; \ 2933 ac--; av++; \ 2934 } else \ 2935 errx(EX_USAGE, "missing \")\"\n"); \ 2936 } 2937 2938#define NOT_BLOCK \ 2939 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2940 if (cmd->len & F_NOT) \ 2941 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2942 cmd->len |= F_NOT; \ 2943 ac--; av++; \ 2944 } 2945 2946#define OR_BLOCK(target) \ 2947 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2948 if (prev == NULL || open_par == 0) \ 2949 errx(EX_DATAERR, "invalid OR block"); \ 2950 prev->len |= F_OR; \ 2951 ac--; av++; \ 2952 goto target; \ 2953 } \ 2954 CLOSE_PAR; 2955 2956 first_cmd = cmd; 2957 2958#if 0 2959 /* 2960 * MAC addresses, optional. 2961 * If we have this, we skip the part "proto from src to dst" 2962 * and jump straight to the option parsing. 2963 */ 2964 NOT_BLOCK; 2965 NEED1("missing protocol"); 2966 if (!strncmp(*av, "MAC", strlen(*av)) || 2967 !strncmp(*av, "mac", strlen(*av))) { 2968 ac--; av++; /* the "MAC" keyword */ 2969 add_mac(cmd, ac, av); /* exits in case of errors */ 2970 cmd = next_cmd(cmd); 2971 ac -= 2; av += 2; /* dst-mac and src-mac */ 2972 NOT_BLOCK; 2973 NEED1("missing mac type"); 2974 if (add_mactype(cmd, ac, av[0])) 2975 cmd = next_cmd(cmd); 2976 ac--; av++; /* any or mac-type */ 2977 goto read_options; 2978 } 2979#endif 2980 2981 /* 2982 * protocol, mandatory 2983 */ 2984 OR_START(get_proto); 2985 NOT_BLOCK; 2986 NEED1("missing protocol"); 2987 if (add_proto(cmd, *av)) { 2988 av++; ac--; 2989 if (F_LEN(cmd) == 0) /* plain IP */ 2990 proto = 0; 2991 else { 2992 proto = cmd->arg1; 2993 prev = cmd; 2994 cmd = next_cmd(cmd); 2995 } 2996 } else if (first_cmd != cmd) { 2997 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 2998 } else 2999 goto read_options; 3000 OR_BLOCK(get_proto); 3001 3002 /* 3003 * "from", mandatory 3004 */ 3005 if (!ac || strncmp(*av, "from", strlen(*av))) 3006 errx(EX_USAGE, "missing ``from''"); 3007 ac--; av++; 3008 3009 /* 3010 * source IP, mandatory 3011 */ 3012 OR_START(source_ip); 3013 NOT_BLOCK; /* optional "not" */ 3014 NEED1("missing source address"); 3015 if (add_srcip(cmd, *av)) { 3016 ac--; av++; 3017 if (F_LEN(cmd) != 0) { /* ! any */ 3018 prev = cmd; 3019 cmd = next_cmd(cmd); 3020 } 3021 } 3022 OR_BLOCK(source_ip); 3023 3024 /* 3025 * source ports, optional 3026 */ 3027 NOT_BLOCK; /* optional "not" */ 3028 if (ac) { 3029 if (!strncmp(*av, "any", strlen(*av)) || 3030 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3031 ac--; av++; 3032 if (F_LEN(cmd) != 0) 3033 cmd = next_cmd(cmd); 3034 } 3035 } 3036 3037 /* 3038 * "to", mandatory 3039 */ 3040 if (!ac || strncmp(*av, "to", strlen(*av))) 3041 errx(EX_USAGE, "missing ``to''"); 3042 av++; ac--; 3043 3044 /* 3045 * destination, mandatory 3046 */ 3047 OR_START(dest_ip); 3048 NOT_BLOCK; /* optional "not" */ 3049 NEED1("missing dst address"); 3050 if (add_dstip(cmd, *av)) { 3051 ac--; av++; 3052 if (F_LEN(cmd) != 0) { /* ! any */ 3053 prev = cmd; 3054 cmd = next_cmd(cmd); 3055 } 3056 } 3057 OR_BLOCK(dest_ip); 3058 3059 /* 3060 * dest. ports, optional 3061 */ 3062 NOT_BLOCK; /* optional "not" */ 3063 if (ac) { 3064 if (!strncmp(*av, "any", strlen(*av)) || 3065 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3066 ac--; av++; 3067 if (F_LEN(cmd) != 0) 3068 cmd = next_cmd(cmd); 3069 } 3070 } 3071 3072read_options: 3073 if (ac && first_cmd == cmd) { 3074 /* 3075 * nothing specified so far, store in the rule to ease 3076 * printout later. 3077 */ 3078 rule->_pad = 1; 3079 } 3080 prev = NULL; 3081 while (ac) { 3082 char *s; 3083 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3084 3085 s = *av; 3086 cmd32 = (ipfw_insn_u32 *)cmd; 3087 3088 if (*s == '!') { /* alternate syntax for NOT */ 3089 if (cmd->len & F_NOT) 3090 errx(EX_USAGE, "double \"not\" not allowed\n"); 3091 cmd->len = F_NOT; 3092 s++; 3093 } 3094 i = match_token(rule_options, s); 3095 ac--; av++; 3096 switch(i) { 3097 case TOK_NOT: 3098 if (cmd->len & F_NOT) 3099 errx(EX_USAGE, "double \"not\" not allowed\n"); 3100 cmd->len = F_NOT; 3101 break; 3102 3103 case TOK_OR: 3104 if (open_par == 0 || prev == NULL) 3105 errx(EX_USAGE, "invalid \"or\" block\n"); 3106 prev->len |= F_OR; 3107 break; 3108 3109 case TOK_STARTBRACE: 3110 if (open_par) 3111 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3112 open_par = 1; 3113 break; 3114 3115 case TOK_ENDBRACE: 3116 if (!open_par) 3117 errx(EX_USAGE, "+missing \")\"\n"); 3118 open_par = 0; 3119 prev = NULL; 3120 break; 3121 3122 case TOK_IN: 3123 fill_cmd(cmd, O_IN, 0, 0); 3124 break; 3125 3126 case TOK_OUT: 3127 cmd->len ^= F_NOT; /* toggle F_NOT */ 3128 fill_cmd(cmd, O_IN, 0, 0); 3129 break; 3130 3131 case TOK_FRAG: 3132 fill_cmd(cmd, O_FRAG, 0, 0); 3133 break; 3134 3135 case TOK_LAYER2: 3136 fill_cmd(cmd, O_LAYER2, 0, 0); 3137 break; 3138 3139 case TOK_XMIT: 3140 case TOK_RECV: 3141 case TOK_VIA: 3142 NEED1("recv, xmit, via require interface name" 3143 " or address"); 3144 fill_iface((ipfw_insn_if *)cmd, av[0]); 3145 ac--; av++; 3146 if (F_LEN(cmd) == 0) /* not a valid address */ 3147 break; 3148 if (i == TOK_XMIT) 3149 cmd->opcode = O_XMIT; 3150 else if (i == TOK_RECV) 3151 cmd->opcode = O_RECV; 3152 else if (i == TOK_VIA) 3153 cmd->opcode = O_VIA; 3154 break; 3155 3156 case TOK_ICMPTYPES: 3157 NEED1("icmptypes requires list of types"); 3158 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3159 av++; ac--; 3160 break; 3161 3162 case TOK_IPTTL: 3163 NEED1("ipttl requires TTL"); 3164 if (strpbrk(*av, "-,")) { 3165 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3166 errx(EX_DATAERR, "invalid ipttl %s", *av); 3167 } else 3168 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3169 ac--; av++; 3170 break; 3171 3172 case TOK_IPID: 3173 NEED1("ipid requires id"); 3174 if (strpbrk(*av, "-,")) { 3175 if (!add_ports(cmd, *av, 0, O_IPID)) 3176 errx(EX_DATAERR, "invalid ipid %s", *av); 3177 } else 3178 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3179 ac--; av++; 3180 break; 3181 3182 case TOK_IPLEN: 3183 NEED1("iplen requires length"); 3184 if (strpbrk(*av, "-,")) { 3185 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3186 errx(EX_DATAERR, "invalid ip len %s", *av); 3187 } else 3188 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3189 ac--; av++; 3190 break; 3191 3192 case TOK_IPVER: 3193 NEED1("ipver requires version"); 3194 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3195 ac--; av++; 3196 break; 3197 3198 case TOK_IPPRECEDENCE: 3199 NEED1("ipprecedence requires value"); 3200 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3201 (strtoul(*av, NULL, 0) & 7) << 5); 3202 ac--; av++; 3203 break; 3204 3205 case TOK_IPOPTS: 3206 NEED1("missing argument for ipoptions"); 3207 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3208 ac--; av++; 3209 break; 3210 3211 case TOK_IPTOS: 3212 NEED1("missing argument for iptos"); 3213 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3214 ac--; av++; 3215 break; 3216 3217 case TOK_UID: 3218 NEED1("uid requires argument"); 3219 { 3220 char *end; 3221 uid_t uid; 3222 struct passwd *pwd; 3223 3224 cmd->opcode = O_UID; 3225 uid = strtoul(*av, &end, 0); 3226 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3227 if (pwd == NULL) 3228 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3229 cmd32->d[0] = pwd->pw_uid; 3230 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3231 ac--; av++; 3232 } 3233 break; 3234 3235 case TOK_GID: 3236 NEED1("gid requires argument"); 3237 { 3238 char *end; 3239 gid_t gid; 3240 struct group *grp; 3241 3242 cmd->opcode = O_GID; 3243 gid = strtoul(*av, &end, 0); 3244 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3245 if (grp == NULL) 3246 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3247 cmd32->d[0] = grp->gr_gid; 3248 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3249 ac--; av++; 3250 } 3251 break; 3252 3253 case TOK_ESTAB: 3254 fill_cmd(cmd, O_ESTAB, 0, 0); 3255 break; 3256 3257 case TOK_SETUP: 3258 fill_cmd(cmd, O_TCPFLAGS, 0, 3259 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3260 break; 3261 3262 case TOK_TCPOPTS: 3263 NEED1("missing argument for tcpoptions"); 3264 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3265 ac--; av++; 3266 break; 3267 3268 case TOK_TCPSEQ: 3269 case TOK_TCPACK: 3270 NEED1("tcpseq/tcpack requires argument"); 3271 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3272 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3273 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3274 ac--; av++; 3275 break; 3276 3277 case TOK_TCPWIN: 3278 NEED1("tcpwin requires length"); 3279 fill_cmd(cmd, O_TCPWIN, 0, 3280 htons(strtoul(*av, NULL, 0))); 3281 ac--; av++; 3282 break; 3283 3284 case TOK_TCPFLAGS: 3285 NEED1("missing argument for tcpflags"); 3286 cmd->opcode = O_TCPFLAGS; 3287 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3288 ac--; av++; 3289 break; 3290 3291 case TOK_KEEPSTATE: 3292 if (open_par) 3293 errx(EX_USAGE, "keep-state cannot be part " 3294 "of an or block"); 3295 if (have_state) 3296 errx(EX_USAGE, "only one of keep-state " 3297 "and limit is allowed"); 3298 have_state = cmd; 3299 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3300 break; 3301 3302 case TOK_LIMIT: 3303 if (open_par) 3304 errx(EX_USAGE, "limit cannot be part " 3305 "of an or block"); 3306 if (have_state) 3307 errx(EX_USAGE, "only one of keep-state " 3308 "and limit is allowed"); 3309 NEED1("limit needs mask and # of connections"); 3310 have_state = cmd; 3311 { 3312 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3313 3314 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3315 cmd->opcode = O_LIMIT; 3316 c->limit_mask = 0; 3317 c->conn_limit = 0; 3318 for (; ac >1 ;) { 3319 int val; 3320 3321 val = match_token(limit_masks, *av); 3322 if (val <= 0) 3323 break; 3324 c->limit_mask |= val; 3325 ac--; av++; 3326 } 3327 c->conn_limit = atoi(*av); 3328 if (c->conn_limit == 0) 3329 errx(EX_USAGE, "limit: limit must be >0"); 3330 if (c->limit_mask == 0) 3331 errx(EX_USAGE, "missing limit mask"); 3332 ac--; av++; 3333 } 3334 break; 3335 3336 case TOK_PROTO: 3337 NEED1("missing protocol"); 3338 if (add_proto(cmd, *av)) { 3339 proto = cmd->arg1; 3340 ac--; av++; 3341 } else 3342 errx(EX_DATAERR, "invalid protocol ``%s''", 3343 *av); 3344 break; 3345 3346 case TOK_SRCIP: 3347 NEED1("missing source IP"); 3348 if (add_srcip(cmd, *av)) { 3349 ac--; av++; 3350 } 3351 break; 3352 3353 case TOK_DSTIP: 3354 NEED1("missing destination IP"); 3355 if (add_dstip(cmd, *av)) { 3356 ac--; av++; 3357 } 3358 break; 3359 3360 case TOK_SRCPORT: 3361 NEED1("missing source port"); 3362 if (!strncmp(*av, "any", strlen(*av)) || 3363 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3364 ac--; av++; 3365 } else 3366 errx(EX_DATAERR, "invalid source port %s", *av); 3367 break; 3368 3369 case TOK_DSTPORT: 3370 NEED1("missing destination port"); 3371 if (!strncmp(*av, "any", strlen(*av)) || 3372 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3373 ac--; av++; 3374 } else 3375 errx(EX_DATAERR, "invalid destination port %s", 3376 *av); 3377 break; 3378 3379 case TOK_MAC: 3380 if (ac < 2) 3381 errx(EX_USAGE, "MAC dst-mac src-mac"); 3382 if (add_mac(cmd, ac, av)) { 3383 ac -= 2; av += 2; 3384 } 3385 break; 3386 3387 case TOK_MACTYPE: 3388 NEED1("missing mac type"); 3389 if (!add_mactype(cmd, ac, *av)) 3390 errx(EX_DATAERR, "invalid mac type %s", *av); 3391 ac--; av++; 3392 break; 3393 3394 case TOK_VERREVPATH: 3395 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3396 break; 3397 3398 case TOK_IPSEC: 3399 fill_cmd(cmd, O_IPSEC, 0, 0); 3400 break; 3401 3402 case TOK_COMMENT: 3403 fill_comment(cmd, ac, av); 3404 av += ac; 3405 ac = 0; 3406 break; 3407 3408 default: 3409 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3410 } 3411 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3412 prev = cmd; 3413 cmd = next_cmd(cmd); 3414 } 3415 } 3416 3417done: 3418 /* 3419 * Now copy stuff into the rule. 3420 * If we have a keep-state option, the first instruction 3421 * must be a PROBE_STATE (which is generated here). 3422 * If we have a LOG option, it was stored as the first command, 3423 * and now must be moved to the top of the action part. 3424 */ 3425 dst = (ipfw_insn *)rule->cmd; 3426 3427 /* 3428 * First thing to write into the command stream is the match probability. 3429 */ 3430 if (match_prob != 1) { /* 1 means always match */ 3431 dst->opcode = O_PROB; 3432 dst->len = 2; 3433 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3434 dst += dst->len; 3435 } 3436 3437 /* 3438 * generate O_PROBE_STATE if necessary 3439 */ 3440 if (have_state && have_state->opcode != O_CHECK_STATE) { 3441 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3442 dst = next_cmd(dst); 3443 } 3444 /* 3445 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3446 */ 3447 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3448 i = F_LEN(src); 3449 3450 switch (src->opcode) { 3451 case O_LOG: 3452 case O_KEEP_STATE: 3453 case O_LIMIT: 3454 break; 3455 default: 3456 bcopy(src, dst, i * sizeof(uint32_t)); 3457 dst += i; 3458 } 3459 } 3460 3461 /* 3462 * put back the have_state command as last opcode 3463 */ 3464 if (have_state && have_state->opcode != O_CHECK_STATE) { 3465 i = F_LEN(have_state); 3466 bcopy(have_state, dst, i * sizeof(uint32_t)); 3467 dst += i; 3468 } 3469 /* 3470 * start action section 3471 */ 3472 rule->act_ofs = dst - rule->cmd; 3473 3474 /* 3475 * put back O_LOG if necessary 3476 */ 3477 src = (ipfw_insn *)cmdbuf; 3478 if ( src->opcode == O_LOG ) { 3479 i = F_LEN(src); 3480 bcopy(src, dst, i * sizeof(uint32_t)); 3481 dst += i; 3482 } 3483 /* 3484 * copy all other actions 3485 */ 3486 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3487 i = F_LEN(src); 3488 bcopy(src, dst, i * sizeof(uint32_t)); 3489 dst += i; 3490 } 3491 3492 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3493 i = (char *)dst - (char *)rule; 3494 if (do_cmd(IP_FW_ADD, rule, (socklen_t)&i) == -1) 3495 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3496 if (!do_quiet) 3497 show_ipfw(rule, 0, 0); 3498} 3499 3500static void 3501zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3502{ 3503 int rulenum; 3504 int failed = EX_OK; 3505 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3506 3507 av++; ac--; 3508 3509 if (!ac) { 3510 /* clear all entries */ 3511 if (do_cmd(optname, NULL, 0) < 0) 3512 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3513 if (!do_quiet) 3514 printf("%s.\n", optname == IP_FW_ZERO ? 3515 "Accounting cleared":"Logging counts reset"); 3516 3517 return; 3518 } 3519 3520 while (ac) { 3521 /* Rule number */ 3522 if (isdigit(**av)) { 3523 rulenum = atoi(*av); 3524 av++; 3525 ac--; 3526 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3527 warn("rule %u: setsockopt(IP_FW_%s)", 3528 rulenum, name); 3529 failed = EX_UNAVAILABLE; 3530 } else if (!do_quiet) 3531 printf("Entry %d %s.\n", rulenum, 3532 optname == IP_FW_ZERO ? 3533 "cleared" : "logging count reset"); 3534 } else { 3535 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3536 } 3537 } 3538 if (failed != EX_OK) 3539 exit(failed); 3540} 3541 3542static void 3543flush(void) 3544{ 3545 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3546 3547 if (!do_force && !do_quiet) { /* need to ask user */ 3548 int c; 3549 3550 printf("Are you sure? [yn] "); 3551 fflush(stdout); 3552 do { 3553 c = toupper(getc(stdin)); 3554 while (c != '\n' && getc(stdin) != '\n') 3555 if (feof(stdin)) 3556 return; /* and do not flush */ 3557 } while (c != 'Y' && c != 'N'); 3558 printf("\n"); 3559 if (c == 'N') /* user said no */ 3560 return; 3561 } 3562 if (do_cmd(cmd, NULL, 0) < 0) 3563 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3564 do_pipe ? "DUMMYNET" : "FW"); 3565 if (!do_quiet) 3566 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3567} 3568 3569/* 3570 * called with the arguments (excluding program name). 3571 */ 3572static int 3573ipfw_main(int oldac, char **oldav) 3574{ 3575 int ch, ac, save_ac; 3576 char **av, **save_av; 3577 int do_acct = 0; /* Show packet/byte count */ 3578 3579#define WHITESP " \t\f\v\n\r" 3580 if (oldac == 1) { 3581 /* 3582 * If we are called with a single string, try to split it into 3583 * arguments for subsequent parsing. 3584 * But first, remove spaces after a ',', by copying the string 3585 * in-place. 3586 */ 3587 char *arg = oldav[0]; /* The string... */ 3588 int l = strlen(arg); 3589 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3590 int i, j; 3591 for (i = j = 0; i < l; i++) { 3592 if (arg[i] == '#') /* comment marker */ 3593 break; 3594 if (copy) { 3595 arg[j++] = arg[i]; 3596 copy = !index("," WHITESP, arg[i]); 3597 } else { 3598 copy = !index(WHITESP, arg[i]); 3599 if (copy) 3600 arg[j++] = arg[i]; 3601 } 3602 } 3603 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3604 j--; 3605 l = j; /* the new argument length */ 3606 arg[j++] = '\0'; 3607 if (l == 0) /* empty string! */ 3608 show_usage(); 3609 3610 /* 3611 * First, count number of arguments. Because of the previous 3612 * processing, this is just the number of blanks plus 1. 3613 */ 3614 for (i = 0, ac = 1; i < l; i++) 3615 if (index(WHITESP, arg[i]) != NULL) 3616 ac++; 3617 3618 av = calloc(ac, sizeof(char *)); 3619 3620 /* 3621 * Second, copy arguments from cmd[] to av[]. For each one, 3622 * j is the initial character, i is the one past the end. 3623 */ 3624 for (ac = 0, i = j = 0; i < l; i++) 3625 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3626 if (i == l-1) 3627 i++; 3628 av[ac] = calloc(i-j+1, 1); 3629 bcopy(arg+j, av[ac], i-j); 3630 ac++; 3631 j = i + 1; 3632 } 3633 } else { 3634 /* 3635 * If an argument ends with ',' join with the next one. 3636 */ 3637 int first, i, l; 3638 3639 av = calloc(oldac, sizeof(char *)); 3640 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3641 char *arg = oldav[i]; 3642 int k = strlen(arg); 3643 3644 l += k; 3645 if (arg[k-1] != ',' || i == oldac-1) { 3646 /* Time to copy. */ 3647 av[ac] = calloc(l+1, 1); 3648 for (l=0; first <= i; first++) { 3649 strcat(av[ac]+l, oldav[first]); 3650 l += strlen(oldav[first]); 3651 } 3652 ac++; 3653 l = 0; 3654 first = i+1; 3655 } 3656 } 3657 } 3658 3659 if (ac == 0) 3660 show_usage(); 3661 3662 /* Set the force flag for non-interactive processes */ 3663 do_force = !isatty(STDIN_FILENO); 3664 3665 /* Save arguments for final freeing of memory. */ 3666 save_ac = ac; 3667 save_av = av; 3668 3669 optind = optreset = 0; 3670 while ((ch = getopt(ac, av, "acdefhnNqs:Stv")) != -1) 3671 switch (ch) { 3672 case 'a': 3673 do_acct = 1; 3674 break; 3675 3676 case 'c': 3677 do_compact = 1; 3678 break; 3679 3680 case 'd': 3681 do_dynamic = 1; 3682 break; 3683 3684 case 'e': 3685 do_expired = 1; 3686 break; 3687 3688 case 'f': 3689 do_force = 1; 3690 break; 3691 3692 case 'h': /* help */ 3693 help(); 3694 break; /* NOTREACHED */ 3695 3696 case 'n': 3697 test_only = 1; 3698 break; 3699 3700 case 'N': 3701 do_resolv = 1; 3702 break; 3703 3704 case 'q': 3705 do_quiet = 1; 3706 break; 3707 3708 case 's': /* sort */ 3709 do_sort = atoi(optarg); 3710 break; 3711 3712 case 'S': 3713 show_sets = 1; 3714 break; 3715 3716 case 't': 3717 do_time = 1; 3718 break; 3719 3720 case 'v': /* verbose */ 3721 verbose = 1; 3722 break; 3723 3724 default: 3725 show_usage(); 3726 } 3727 3728 ac -= optind; 3729 av += optind; 3730 NEED1("bad arguments, for usage summary ``ipfw''"); 3731 3732 /* 3733 * optional: pipe or queue 3734 */ 3735 if (!strncmp(*av, "pipe", strlen(*av))) { 3736 do_pipe = 1; 3737 ac--; 3738 av++; 3739 } else if (!strncmp(*av, "queue", strlen(*av))) { 3740 do_pipe = 2; 3741 ac--; 3742 av++; 3743 } 3744 NEED1("missing command"); 3745 3746 /* 3747 * For pipes and queues we normally say 'pipe NN config' 3748 * but the code is easier to parse as 'pipe config NN' 3749 * so we swap the two arguments. 3750 */ 3751 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3752 char *p = av[0]; 3753 av[0] = av[1]; 3754 av[1] = p; 3755 } 3756 3757 if (!strncmp(*av, "add", strlen(*av))) 3758 add(ac, av); 3759 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3760 config_pipe(ac, av); 3761 else if (!strncmp(*av, "delete", strlen(*av))) 3762 delete(ac, av); 3763 else if (!strncmp(*av, "flush", strlen(*av))) 3764 flush(); 3765 else if (!strncmp(*av, "zero", strlen(*av))) 3766 zero(ac, av, IP_FW_ZERO); 3767 else if (!strncmp(*av, "resetlog", strlen(*av))) 3768 zero(ac, av, IP_FW_RESETLOG); 3769 else if (!strncmp(*av, "print", strlen(*av)) || 3770 !strncmp(*av, "list", strlen(*av))) 3771 list(ac, av, do_acct); 3772 else if (!strncmp(*av, "set", strlen(*av))) 3773 sets_handler(ac, av); 3774 else if (!strncmp(*av, "enable", strlen(*av))) 3775 sysctl_handler(ac, av, 1); 3776 else if (!strncmp(*av, "disable", strlen(*av))) 3777 sysctl_handler(ac, av, 0); 3778 else if (!strncmp(*av, "show", strlen(*av))) 3779 list(ac, av, 1 /* show counters */); 3780 else 3781 errx(EX_USAGE, "bad command `%s'", *av); 3782 3783 /* Free memory allocated in the argument parsing. */ 3784 for (ch=0; ch < save_ac; ch++) 3785 free(save_av[ch]); 3786 free(save_av); 3787 return 0; 3788} 3789 3790 3791static void 3792ipfw_readfile(int ac, char *av[]) 3793{ 3794#define MAX_ARGS 32 3795 char buf[BUFSIZ]; 3796 char *cmd = NULL, *filename = av[ac-1]; 3797 int c, lineno=0; 3798 FILE *f = NULL; 3799 pid_t preproc = 0; 3800 3801 filename = av[ac-1]; 3802 3803 while ((c = getopt(ac, av, "cNnp:qS")) != -1) { 3804 switch(c) { 3805 case 'c': 3806 do_compact = 1; 3807 break; 3808 3809 case 'N': 3810 do_resolv = 1; 3811 break; 3812 3813 case 'n': 3814 test_only = 1; 3815 break; 3816 3817 case 'p': 3818 cmd = optarg; 3819 /* 3820 * Skip previous args and delete last one, so we 3821 * pass all but the last argument to the preprocessor 3822 * via av[optind-1] 3823 */ 3824 av += optind - 1; 3825 ac -= optind - 1; 3826 av[ac-1] = NULL; 3827 fprintf(stderr, "command is %s\n", av[0]); 3828 break; 3829 3830 case 'q': 3831 do_quiet = 1; 3832 break; 3833 3834 case 'S': 3835 show_sets = 1; 3836 break; 3837 3838 default: 3839 errx(EX_USAGE, "bad arguments, for usage" 3840 " summary ``ipfw''"); 3841 } 3842 3843 if (cmd != NULL) 3844 break; 3845 } 3846 3847 if (cmd == NULL && ac != optind + 1) { 3848 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 3849 errx(EX_USAGE, "extraneous filename arguments"); 3850 } 3851 3852 if ((f = fopen(filename, "r")) == NULL) 3853 err(EX_UNAVAILABLE, "fopen: %s", filename); 3854 3855 if (cmd != NULL) { /* pipe through preprocessor */ 3856 int pipedes[2]; 3857 3858 if (pipe(pipedes) == -1) 3859 err(EX_OSERR, "cannot create pipe"); 3860 3861 preproc = fork(); 3862 if (preproc == -1) 3863 err(EX_OSERR, "cannot fork"); 3864 3865 if (preproc == 0) { 3866 /* 3867 * Child, will run the preprocessor with the 3868 * file on stdin and the pipe on stdout. 3869 */ 3870 if (dup2(fileno(f), 0) == -1 3871 || dup2(pipedes[1], 1) == -1) 3872 err(EX_OSERR, "dup2()"); 3873 fclose(f); 3874 close(pipedes[1]); 3875 close(pipedes[0]); 3876 execvp(cmd, av); 3877 err(EX_OSERR, "execvp(%s) failed", cmd); 3878 } else { /* parent, will reopen f as the pipe */ 3879 fclose(f); 3880 close(pipedes[1]); 3881 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3882 int savederrno = errno; 3883 3884 (void)kill(preproc, SIGTERM); 3885 errno = savederrno; 3886 err(EX_OSERR, "fdopen()"); 3887 } 3888 } 3889 } 3890 3891 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 3892 char linename[10]; 3893 char *args[1]; 3894 3895 lineno++; 3896 sprintf(linename, "Line %d", lineno); 3897 setprogname(linename); /* XXX */ 3898 args[0] = buf; 3899 ipfw_main(1, args); 3900 } 3901 fclose(f); 3902 if (cmd != NULL) { 3903 int status; 3904 3905 if (waitpid(preproc, &status, 0) == -1) 3906 errx(EX_OSERR, "waitpid()"); 3907 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3908 errx(EX_UNAVAILABLE, 3909 "preprocessor exited with status %d", 3910 WEXITSTATUS(status)); 3911 else if (WIFSIGNALED(status)) 3912 errx(EX_UNAVAILABLE, 3913 "preprocessor exited with signal %d", 3914 WTERMSIG(status)); 3915 } 3916} 3917 3918int 3919main(int ac, char *av[]) 3920{ 3921 /* 3922 * If the last argument is an absolute pathname, interpret it 3923 * as a file to be preprocessed. 3924 */ 3925 3926 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3927 ipfw_readfile(ac, av); 3928 else 3929 ipfw_main(ac-1, av+1); 3930 return EX_OK; 3931} 3932